X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/ed90ea49e025e0c8083f9d98768d870e6a880f13..9309f7671243626e9392149c698d413585b049b5:/l2tpns.c diff --git a/l2tpns.c b/l2tpns.c index abdfb9c..4e8d095 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -1,8 +1,11 @@ // L2TP Network Server // Adrian Kennard 2002 -// (c) Copyrigth 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) +// Copyright (c) 2003, 2004 Optus Internet Engineering +// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced // vim: sw=8 ts=8 +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.61 2004/11/29 03:55:21 bodea Exp $"; + #include #include #include @@ -19,8 +22,8 @@ #include #include #include -#define __USE_GNU #include +#include #include #include #include @@ -46,82 +49,82 @@ #include "util.h" #include "tbf.h" +#ifdef BGP +#include "bgp.h" +#endif /* BGP */ + // Globals -struct configt *config = NULL; // all configuration -int tapfd = -1; // tap interface file handle +configt *config = NULL; // all configuration +int tunfd = -1; // tun interface file handle. (network device) int udpfd = -1; // UDP file handle int controlfd = -1; // Control signal handle +int clifd = -1; // Socket listening for CLI connections. int snoopfd = -1; // UDP file handle for sending out intercept data int *radfds = NULL; // RADIUS requests file handles int ifrfd = -1; // File descriptor for routing, etc time_t basetime = 0; // base clock char hostname[1000] = ""; // us. -u16 tapmac[3]; // MAC of tap interface -int tapidx; // ifr_ifindex of tap device -u32 sessionid = 0; // session id for radius accounting -int syslog_log = 0; // are we logging to syslog -FILE *log_stream = NULL; -struct sockaddr_in snoop_addr = {0}; -extern int cluster_sockfd; -u32 last_sid = 0; -int clifd = 0; -sessionidt *cli_session_kill = NULL; -tunnelidt *cli_tunnel_kill = NULL; -static void *ip_hash[256]; -u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; -u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0; -u32 ip_pool_size = 1; -time_t time_now = 0; -char time_now_string[64] = {0}; -char main_quit = 0; -char *_program_name = NULL; +static u32 sessionid = 0; // session id for radius accounting +static int syslog_log = 0; // are we logging to syslog +static FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog). +extern int cluster_sockfd; // Intra-cluster communications socket. +u32 last_id = 0; // Last used PPP SID. Can I kill this?? -- mo + +struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI +struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI + +static void *ip_hash[256]; // Mapping from IP address to session structures. + +// Traffic counters. +static u32 udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0; +static u32 eth_rx = 0, eth_rx_pkt = 0; +u32 eth_tx = 0; + +static u32 ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation. +time_t time_now = 0; // Current time in seconds since epoch. +static char time_now_string[64] = {0}; // Current time as a string. +static char main_quit = 0; // True if we're in the process of exiting. linked_list *loaded_plugins; linked_list *plugins[MAX_PLUGIN_TYPES]; -#ifdef BGP -#include "bgp.h" -struct bgp_peer *bgp_peers = 0; -struct bgp_route_list *bgp_routes = 0; -int bgp_configured = 0; -#endif /* BGP */ - #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER) -#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE } +#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE } -struct config_descriptt config_values[] = { +config_descriptt config_values[] = { CONFIG("debug", debug, INT), CONFIG("log_file", log_filename, STRING), + CONFIG("pid_file", pid_file, STRING), CONFIG("l2tp_secret", l2tpsecret, STRING), CONFIG("primary_dns", default_dns1, IP), CONFIG("secondary_dns", default_dns2, IP), CONFIG("save_state", save_state, BOOL), CONFIG("primary_radius", radiusserver[0], IP), CONFIG("secondary_radius", radiusserver[1], IP), + CONFIG("primary_radius_port", radiusport[0], SHORT), + CONFIG("secondary_radius_port", radiusport[1], SHORT), CONFIG("radius_accounting", radius_accounting, BOOL), CONFIG("radius_secret", radiussecret, STRING), CONFIG("bind_address", bind_address, IP), + CONFIG("peer_address", peer_address, IP), CONFIG("send_garp", send_garp, BOOL), CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG), + CONFIG("throttle_buckets", num_tbfs, INT), CONFIG("accounting_dir", accounting_dir, STRING), CONFIG("setuid", target_uid, INT), CONFIG("dump_speed", dump_speed, BOOL), CONFIG("cleanup_interval", cleanup_interval, INT), CONFIG("multi_read_count", multi_read_count, INT), CONFIG("scheduler_fifo", scheduler_fifo, BOOL), + CONFIG("lock_pages", lock_pages, BOOL), CONFIG("icmp_rate", icmp_rate, INT), CONFIG("cluster_address", cluster_address, IP), CONFIG("cluster_interface", cluster_interface, STRING), -#ifdef BGP - CONFIG("as_number", as_number, SHORT), - CONFIG("bgp_peer1", bgp_peer[0], STRING), - CONFIG("bgp_peer1_as", bgp_peer_as[0], SHORT), - CONFIG("bgp_peer2", bgp_peer[1], STRING), - CONFIG("bgp_peer2_as", bgp_peer_as[1], SHORT), -#endif /* BGP */ + CONFIG("cluster_hb_interval", cluster_hb_interval, INT), + CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT), { NULL, 0, 0, 0 }, }; -char *plugin_functions[] = { +static char *plugin_functions[] = { NULL, "plugin_pre_auth", "plugin_post_auth", @@ -138,34 +141,42 @@ char *plugin_functions[] = { #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *)) -tunnelt *tunnel = NULL; // 1000 * 45 = 45000 = 45k -sessiont *session = NULL; // 5000 * 213 = 1065000 = 1 Mb -sessioncountt *sess_count = NULL; -radiust *radius = NULL; -ippoolt *ip_address_pool = NULL; -controlt *controlfree = 0; +tunnelt *tunnel = NULL; // Array of tunnel structures. +sessiont *session = NULL; // Array of session structures. +sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters. +radiust *radius = NULL; // Array of radius structures. +ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses. +ip_filtert *ip_filters = NULL; // Array of named filters. +static controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER struct Tringbuffer *ringbuffer = NULL; #endif -void sigalrm_handler(int); -void sighup_handler(int); -void sigterm_handler(int); -void sigquit_handler(int); -void sigchild_handler(int); -void read_config_file(); -void read_state(); -void dump_state(); -void tunnel_clean(); -tunnelidt new_tunnel(); -void update_config(); - static void cache_ipmap(ipt ip, int s); static void uncache_ipmap(ipt ip); - -// return internal time (10ths since run) -clockt now(void) +static void free_ip_address(sessionidt s); +static void dump_acct_info(void); +static void sighup_handler(int sig); +static void sigalrm_handler(int sig); +static void sigterm_handler(int sig); +static void sigquit_handler(int sig); +static void sigchild_handler(int sig); +static void read_state(void); +static void dump_state(void); +static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response); +static void update_config(void); +static void read_config_file(void); +static void initplugins(void); +static int add_plugin(char *plugin_name); +static int remove_plugin(char *plugin_name); +static void plugins_done(void); +static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen); +static tunnelidt new_tunnel(void); +static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length); + +// return internal time (10ths since process startup) +static clockt now(void) { struct timeval t; gettimeofday(&t, 0); @@ -173,13 +184,19 @@ clockt now(void) } // work out a retry time based on try number +// This is a straight bounded exponential backoff. +// Maximum re-try time is 32 seconds. (2^5). clockt backoff(u8 try) { if (try > 5) try = 5; // max backoff return now() + 10 * (1 << try); } -void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) + +// +// Log a debug message. Typically called via the LOG macro +// +void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) { static char message[65536] = {0}; static char message2[65536] = {0}; @@ -195,7 +212,6 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ringbuffer->head = 0; ringbuffer->buffer[ringbuffer->tail].level = level; - ringbuffer->buffer[ringbuffer->tail].address = address; ringbuffer->buffer[ringbuffer->tail].session = s; ringbuffer->buffer[ringbuffer->tail].tunnel = t; va_start(ap, format); @@ -222,17 +238,17 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, va_end(ap); } -void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize) +void _log_hex(int level, const char *title, const char *data, int maxsize) { int i, j; const u8 *d = (const u8 *)data; if (config->debug < level) return; - // No support for log_hex to syslog + // No support for _log_hex to syslog if (log_stream) { - log(level, address, s, t, "%s (%d bytes):\n", title, maxsize); + _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize); setvbuf(log_stream, NULL, _IOFBF, 16384); for (i = 0; i < maxsize; ) @@ -277,22 +293,22 @@ void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *tit // Add a route // // This adds it to the routing table, advertises it -// via iBGP if enabled, and stuffs it into the +// via BGP if enabled, and stuffs it into the // 'sessionbyip' cache. // // 'ip' and 'mask' must be in _host_ order. // -void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) +static void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) { struct rtentry r; int i; if (!mask) mask = 0xffffffff; - ip = ip & mask; // Force the ip to be the first one in the route. + ip &= mask; // Force the ip to be the first one in the route. memset(&r, 0, sizeof(r)); - r.rt_dev = config->tapdevice; + r.rt_dev = config->tundevice; r.rt_dst.sa_family = AF_INET; *(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip); r.rt_gateway.sa_family = AF_INET; @@ -304,14 +320,13 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) r.rt_flags |= RTF_GATEWAY; else if (mask == 0xffffffff) r.rt_flags |= RTF_HOST; - if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) - log(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); - log(1, ip, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n", - add ? "add" : "del", - ip >> 24, ip >> 16 & 0xff, ip >> 8 & 0xff, ip & 0xff, - mask >> 24, mask >> 16 & 0xff, mask >> 8 & 0xff, mask & 0xff, - gw >> 24, gw >> 16 & 0xff, gw >> 8 & 0xff, gw & 0xff); + LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del", + fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1), + gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : ""); + + if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) + LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); #ifdef BGP if (add) @@ -321,7 +336,7 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) #endif /* BGP */ // Add/Remove the IPs to the 'sessionbyip' cache. - // Note that we add the zero address in the case of + // Note that we add the zero address in the case of // a network route. Roll on CIDR. // Note that 's == 0' implies this is the address pool. @@ -338,31 +353,32 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) } } -// Set up TAP interface -void inittap(void) +// +// Set up TUN interface +static void inittun(void) { struct ifreq ifr; struct sockaddr_in sin = {0}; memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = IFF_TUN; - tapfd = open(TAPDEVICE, O_RDWR); - if (tapfd < 0) + tunfd = open(TUNDEVICE, O_RDWR); + if (tunfd < 0) { // fatal - log(0, 0, 0, 0, "Can't open %s: %s\n", TAPDEVICE, strerror(errno)); + LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno)); exit(1); } { - int flags = fcntl(tapfd, F_GETFL, 0); - fcntl(tapfd, F_SETFL, flags | O_NONBLOCK); + int flags = fcntl(tunfd, F_GETFL, 0); + fcntl(tunfd, F_SETFL, flags | O_NONBLOCK); } - if (ioctl(tapfd, TUNSETIFF, (void *) &ifr) < 0) + if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Can't set tap interface: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno)); exit(1); } - assert(strlen(ifr.ifr_name) < sizeof(config->tapdevice)); - strncpy(config->tapdevice, ifr.ifr_name, sizeof(config->tapdevice) - 1); + assert(strlen(ifr.ifr_name) < sizeof(config->tundevice)); + strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1); ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); sin.sin_family = AF_INET; @@ -371,38 +387,26 @@ void inittap(void) if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno)); exit(1); } /* Bump up the qlen to deal with bursts from the network */ ifr.ifr_qlen = 1000; if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); exit(1); } ifr.ifr_flags = IFF_UP; if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); - exit(1); - } - if (ioctl(ifrfd, SIOCGIFHWADDR, (void *) &ifr) < 0) - { - log(0, 0, 0, 0, "Error setting tun hardware address: %s\n", strerror(errno)); - exit(1); - } - memcpy(&tapmac, 2 + (u8 *) & ifr.ifr_hwaddr, 6); - if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0) - { - log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); exit(1); } - tapidx = ifr.ifr_ifindex; } // set up UDP port -void initudp(void) +static void initudp(void) { int on = 1; struct sockaddr_in addr; @@ -412,7 +416,7 @@ void initudp(void) addr.sin_family = AF_INET; addr.sin_port = htons(L2TPPORT); addr.sin_addr.s_addr = config->bind_address; - udpfd = socket(AF_INET, SOCK_DGRAM, UDP); + udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); { int flags = fcntl(udpfd, F_GETFL, 0); @@ -420,21 +424,20 @@ void initudp(void) } if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0) { - log(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); exit(1); } - snoopfd = socket(AF_INET, SOCK_DGRAM, UDP); - snoop_addr.sin_family = AF_INET; + snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); // Control memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; - addr.sin_port = htons(1702); - controlfd = socket(AF_INET, SOCK_DGRAM, 17); + addr.sin_port = htons(NSCTL_PORT); + controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0) { - log(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno)); exit(1); } } @@ -454,7 +457,7 @@ void initudp(void) // IP address. // -int lookup_ipmap(ipt ip) +static int lookup_ipmap(ipt ip) { u8 *a = (u8 *)&ip; char **d = (char **) ip_hash; @@ -471,10 +474,8 @@ int lookup_ipmap(ipt ip) sessionidt sessionbyip(ipt ip) { int s = lookup_ipmap(ip); + CSTAT(call_sessionbyip); -#ifdef STAT_CALLS - STAT(call_sessionbyip); -#endif if (s > 0 && s < MAXSESSION && session[s].tunnel) return s; return 0; @@ -507,9 +508,10 @@ static void cache_ipmap(ipt ip, int s) d[(size_t) a[3]] = (char *)((int)s); if (s > 0) - log(4, ip, s, session[s].tunnel, "Caching ip address %s\n", inet_toa(nip)); + LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0)); + else if (s == 0) - log(4, ip, 0, 0, "Un-caching ip address %s\n", inet_toa(nip)); + LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0)); // else a map to an ip pool index. } @@ -527,20 +529,31 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) int i, j, k, l; int count = 0; - cli_print(cli, "%7s %s", "Sess#", "IP Address"); + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; + + cli_print(cli, "%7s %s", "Sess#", "IP Address"); - for (i = 0; i < 256; ++i) { - if (!d[i]) continue; + for (i = 0; i < 256; ++i) + { + if (!d[i]) + continue; e = (char**) d[i]; - for (j = 0; j < 256; ++j) { - if (!e[j]) continue; + for (j = 0; j < 256; ++j) + { + if (!e[j]) + continue; f = (char**) e[j]; - for (k = 0; k < 256; ++k) { - if (!f[k]) continue; + for (k = 0; k < 256; ++k) + { + if (!f[k]) + continue; g = (char**)f[k]; - for (l = 0; l < 256; ++l) { - if (!g[l]) continue; - cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l); + for (l = 0; l < 256; ++l) + { + if (!g[l]) + continue; + cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l); ++count; } } @@ -560,10 +573,10 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) sessionidt sessionbyuser(char *username) { int s; -#ifdef STAT_CALLS - STAT(call_sessionbyuser); -#endif - for (s = 1; s < MAXSESSION ; ++s) { + CSTAT(call_sessionbyuser); + + for (s = 1; s < MAXSESSION ; ++s) + { if (session[s].walled_garden) continue; // Skip walled garden users. @@ -583,21 +596,21 @@ void send_garp(ipt ip) s = socket(PF_INET, SOCK_DGRAM, 0); if (s < 0) { - log(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno)); return; } memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1); if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0) { - log(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno)); close(s); return; } memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char)); if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { - log(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno)); close(s); return; } @@ -606,108 +619,30 @@ void send_garp(ipt ip) } // Find session by username, 0 for not found -sessiont *sessiontbysessionidt(sessionidt s) +static sessiont *sessiontbysessionidt(sessionidt s) { if (!s || s > MAXSESSION) return NULL; return &session[s]; } -sessionidt sessionidtbysessiont(sessiont *s) +static sessionidt sessionidtbysessiont(sessiont *s) { sessionidt val = s-session; if (s < session || val > MAXSESSION) return 0; return val; } -// Handle ARP requests -void processarp(u8 * buf, int len) -{ - ipt ip; - sessionidt s; - -#ifdef STAT_CALLS - STAT(call_processarp); -#endif - STAT(arp_recv); - if (len != 46) - { - log(0, 0, 0, 0, "Unexpected length ARP %d bytes\n", len); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 16) != htons(PKTARP)) - { - log(0, 0, 0, 0, "Unexpected ARP type %04X\n", ntohs(*(u16 *) (buf + 16))); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 18) != htons(0x0001)) - { - log(0, 0, 0, 0, "Unexpected ARP hard type %04X\n", ntohs(*(u16 *) (buf + 18))); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 20) != htons(PKTIP)) - { - log(0, 0, 0, 0, "Unexpected ARP prot type %04X\n", ntohs(*(u16 *) (buf + 20))); - STAT(arp_errors); - return; - } - if (buf[22] != 6) - { - log(0, 0, 0, 0, "Unexpected ARP hard len %d\n", buf[22]); - STAT(arp_errors); - return; - } - if (buf[23] != 4) - { - log(0, 0, 0, 0, "Unexpected ARP prot len %d\n", buf[23]); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 24) != htons(0x0001)) - { - log(0, 0, 0, 0, "Unexpected ARP op %04X\n", ntohs(*(u16 *) (buf + 24))); - STAT(arp_errors); - return; - } - ip = *(u32 *) (buf + 42); - // look up session - s = sessionbyip(ip); - if (s) - { - log(3, ntohl(ip), s, session[s].tunnel, "ARP reply for %s\n", inet_toa(ip)); - memcpy(buf + 4, buf + 10, 6); // set destination as source - *(u16 *) (buf + 10) = htons(tapmac[0]); // set source address - *(u16 *) (buf + 12) = htons(tapmac[1]); - *(u16 *) (buf + 14) = htons(tapmac[2]); - *(u16 *) (buf + 24) = htons(0x0002); // ARP reply - memcpy(buf + 26, buf + 10, 6); // sender ethernet - memcpy(buf + 36, buf + 4, 6); // target ethernet - *(u32 *) (buf + 42) = *(u32 *) (buf + 32); // target IP - *(u32 *) (buf + 32) = ip; // sender IP - write(tapfd, buf, len); - STAT(arp_replies); - } - else - { - log(3, ntohl(ip), 0, 0, "ARP request for unknown IP %s\n", inet_toa(ip)); - STAT(arp_discarded); - } -} - // actually send a control message for a specific tunnel void tunnelsend(u8 * buf, u16 l, tunnelidt t) { struct sockaddr_in addr; -#ifdef STAT_CALLS - STAT(call_tunnelsend); -#endif + CSTAT(call_tunnelsend); + if (!t) { static int backtrace_count = 0; - log(0, 0, 0, t, "tunnelsend called with 0 as tunnel id\n"); + LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n"); STAT(tunnel_tx_errors); log_backtrace(backtrace_count, 5) return; @@ -716,11 +651,12 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) if (!tunnel[t].ip) { static int backtrace_count = 0; - log(1, 0, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n"); + LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n"); log_backtrace(backtrace_count, 5) STAT(tunnel_tx_errors); return; } + memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; *(u32 *) & addr.sin_addr = htonl(tunnel[t].ip); @@ -737,19 +673,19 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) if (tunnel[t].try > 1) { STAT(tunnel_retries); - log(3, tunnel[t].ip, 0, t, "Control message resend try %d\n", tunnel[t].try); + LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try); } } if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0) { - log(0, tunnel[t].ip, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n", + LOG(0, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n", strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr)); STAT(tunnel_tx_errors); return; } - log_hex(5, "Send Tunnel Data", buf, l); + LOG_HEX(5, "Send Tunnel Data", buf, l); STAT(tunnel_tx_packets); INC_STAT(tunnel_tx_bytes, l); } @@ -760,12 +696,12 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) // int tun_write(u8 * data, int size) { - return write(tapfd, data, size); + return write(tunfd, data, size); } // process outgoing (to tunnel) IP // -void processipout(u8 * buf, int len) +static void processipout(u8 * buf, int len) { sessionidt s; sessiont *sp; @@ -776,18 +712,18 @@ void processipout(u8 * buf, int len) int size = len; u8 b[MAXETHER + 20]; -#ifdef STAT_CALLS - STAT(call_processipout); -#endif + + CSTAT(call_processipout); + if (len < MIN_IP_SIZE) { - log(1, 0, 0, 0, "Short IP, %d bytes\n", len); + LOG(1, 0, 0, "Short IP, %d bytes\n", len); STAT(tunnel_tx_errors); return; } if (len >= MAXETHER) { - log(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len); + LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len); STAT(tunnel_tx_errors); return; } @@ -799,7 +735,7 @@ void processipout(u8 * buf, int len) // Got an IP header now if (*(u8 *)(buf) >> 4 != 4) { - log(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n"); + LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n"); return; } @@ -810,14 +746,15 @@ void processipout(u8 * buf, int len) static int rate = 0; // Number of ICMP packets we've sent this second. static int last = 0; // Last time we reset the ICMP packet counter 'rate'. - if (last != time_now) { + if (last != time_now) + { last = time_now; rate = 0; } if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second. { - log(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32 *)(buf + 12))); + LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(u32 *)(buf + 12), 0)); host_unreachable(*(u32 *)(buf + 12), *(u16 *)(buf + 4), ip, buf, (len < 64) ? 64 : len); } return; @@ -825,6 +762,10 @@ void processipout(u8 * buf, int len) t = session[s].tunnel; sp = &session[s]; + // run access-list if any + if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1)) + return; + if (sp->tbf_out) { // Are we throttling this session? @@ -841,22 +782,19 @@ void processipout(u8 * buf, int len) return; } - // Snooping this session, send it to intercept box - if (sp->snoop_ip && sp->snoop_port) - snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); - - log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); + LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); // Add on L2TP header { u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); - if (!p) { - log(3, session[s].ip, s, t, "failed to send packet in processipout.\n"); - return; - } + if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } + // Snooping this session, send it to intercept box + if (sp->snoop_ip && sp->snoop_port) + snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + sp->cout += len; // byte count sp->total_cout += len; // byte count sp->pout++; @@ -868,7 +806,7 @@ void processipout(u8 * buf, int len) // Helper routine for the TBF filters. // Used to send queued data in to the user! // -void send_ipout(sessionidt s, u8 *buf, int len) +static void send_ipout(sessionidt s, u8 *buf, int len) { sessiont *sp; tunnelidt t; @@ -876,8 +814,9 @@ void send_ipout(sessionidt s, u8 *buf, int len) u8 b[MAXETHER + 20]; - if (len < 0 || len > MAXETHER) { - log(1,0,0,0, "Odd size IP packet: %d bytes\n", len); + if (len < 0 || len > MAXETHER) + { + LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len); return; } @@ -889,24 +828,23 @@ void send_ipout(sessionidt s, u8 *buf, int len) if (!session[s].ip) return; + t = session[s].tunnel; sp = &session[s]; - log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); - - // Snooping this session, send it to ASIO - if (sp->snoop_ip && sp->snoop_port) - snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); // Add on L2TP header { u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); - if (!p) { - log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n"); - return; - } + if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } + + // Snooping this session. + if (sp->snoop_ip && sp->snoop_port) + snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + sp->cout += len; // byte count sp->total_cout += len; // byte count sp->pout++; @@ -915,7 +853,7 @@ void send_ipout(sessionidt s, u8 *buf, int len) } // add an AVP (16 bit) -void control16(controlt * c, u16 avp, u16 val, u8 m) +static void control16(controlt * c, u16 avp, u16 val, u8 m) { u16 l = (m ? 0x8008 : 0x0008); *(u16 *) (c->buf + c->length + 0) = htons(l); @@ -926,7 +864,7 @@ void control16(controlt * c, u16 avp, u16 val, u8 m) } // add an AVP (32 bit) -void control32(controlt * c, u16 avp, u32 val, u8 m) +static void control32(controlt * c, u16 avp, u32 val, u8 m) { u16 l = (m ? 0x800A : 0x000A); *(u16 *) (c->buf + c->length + 0) = htons(l); @@ -937,7 +875,7 @@ void control32(controlt * c, u16 avp, u32 val, u8 m) } // add an AVP (32 bit) -void controls(controlt * c, u16 avp, char *val, u8 m) +static void controls(controlt * c, u16 avp, char *val, u8 m) { u16 l = ((m ? 0x8000 : 0) + strlen(val) + 6); *(u16 *) (c->buf + c->length + 0) = htons(l); @@ -948,7 +886,7 @@ void controls(controlt * c, u16 avp, char *val, u8 m) } // add a binary AVP -void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m) +static void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m) { u16 l = ((m ? 0x8000 : 0) + len + 6); *(u16 *) (c->buf + c->length + 0) = htons(l); @@ -959,7 +897,7 @@ void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m) } // new control connection -controlt *controlnew(u16 mtype) +static controlt *controlnew(u16 mtype) { controlt *c; if (!controlfree) @@ -979,7 +917,7 @@ controlt *controlnew(u16 mtype) // send zero block if nothing is waiting // (ZLB send). -void controlnull(tunnelidt t) +static void controlnull(tunnelidt t) { u8 buf[12]; if (tunnel[t].controlc) // Messages queued; They will carry the ack. @@ -995,7 +933,7 @@ void controlnull(tunnelidt t) } // add a control message to a tunnel, and send if within window -void controladd(controlt * c, tunnelidt t, sessionidt s) +static void controladd(controlt * c, tunnelidt t, sessionidt s) { *(u16 *) (c->buf + 2) = htons(c->length); // length *(u16 *) (c->buf + 4) = htons(tunnel[t].far); // tunnel @@ -1007,8 +945,10 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) tunnel[t].controle->next = c; else tunnel[t].controls = c; + tunnel[t].controle = c; tunnel[t].controlc++; + // send now if space in window if (tunnel[t].controlc <= tunnel[t].window) { @@ -1020,91 +960,118 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) // // Throttle or Unthrottle a session // -// Throttle the data folling through a session -// to be no more than 'throttle' kbit/sec each way. +// Throttle the data from/to through a session to no more than +// 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to +// user). +// +// If either value is -1, the current value is retained for that +// direction. // -int throttle_session(sessionidt s, int throttle) +void throttle_session(sessionidt s, int rate_in, int rate_out) { if (!session[s].tunnel) - return 0; // No-one home. + return; // No-one home. - if (!*session[s].user) - return 0; // User not logged in + if (!*session[s].user) + return; // User not logged in - if (throttle) { - if (session[s].tbf_in || session[s].tbf_out) { - if (throttle == session[s].throttle) - return 1; + if (rate_in >= 0) + { + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) + free_tbf(session[s].tbf_in); - // Currently throttled but the rate is changing. + if (rate_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; - free_tbf(session[s].tbf_in); - free_tbf(session[s].tbf_out); - } + session[s].throttle_in = rate_in; + } - session[s].tbf_in = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipin); - session[s].tbf_out = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipout); + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) + free_tbf(session[s].tbf_out); - if (throttle != session[s].throttle) { // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); - } + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; - return 1; + session[s].throttle_out = rate_out; } +} - // else Unthrottling. +// add/remove filters from session (-1 = no change) +void filter_session(sessionidt s, int filter_in, int filter_out) +{ + if (!session[s].tunnel) + return; // No-one home. - if (!session[s].tbf_in && !session[s].tbf_out && !session[s].throttle) - return 0; + if (!*session[s].user) + return; // User not logged in - free_tbf(session[s].tbf_in); - session[s].tbf_in = 0; + // paranoia + if (filter_in > MAXFILTER) filter_in = -1; + if (filter_out > MAXFILTER) filter_out = -1; + if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0; + if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0; - free_tbf(session[s].tbf_out); - session[s].tbf_out = 0; + if (filter_in >= 0) + { + if (session[s].filter_in) + ip_filters[session[s].filter_in - 1].used--; + + if (filter_in > 0) + ip_filters[filter_in - 1].used++; - if (throttle != session[s].throttle) { // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); + session[s].filter_in = filter_in; } - return 0; + if (filter_out >= 0) + { + if (session[s].filter_out) + ip_filters[session[s].filter_out - 1].used--; + + if (filter_out > 0) + ip_filters[filter_out - 1].used++; + + session[s].filter_out = filter_out; + } } // start tidy shutdown of session void sessionshutdown(sessionidt s, char *reason) { - int dead = session[s].die; int walled_garden = session[s].walled_garden; -#ifdef STAT_CALLS - STAT(call_sessionshutdown); -#endif + + CSTAT(call_sessionshutdown); + if (!session[s].tunnel) { - log(3, session[s].ip, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n"); + LOG(3, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n"); return; // not a live session } if (!session[s].die) - log(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason); - - session[s].die = now() + 150; // Clean up in 15 seconds - { struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] }; + LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason); run_plugins(PLUGIN_KILL_SESSION, &data); } // RADIUS Stop message - if (session[s].opened && !walled_garden && !dead) { + if (session[s].opened && !walled_garden && !session[s].die) + { u16 r = session[s].radius; if (!r) { if (!(r = radiusnew(s))) { - log(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); + LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); STAT(radius_overflow); } else @@ -1121,29 +1088,43 @@ void sessionshutdown(sessionidt s, char *reason) if (session[s].ip) { // IP allocated, clear and unroute int r; + int routed = 0; for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) { - routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 0); + if ((session[s].ip & session[s].route[r].mask) == + (session[s].route[r].ip & session[s].route[r].mask)) + routed++; + + routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0); session[s].route[r].ip = 0; } if (session[s].ip_pool_index == -1) // static ip { - routeset(s, session[s].ip, 0, 0, 0); // Delete route. + if (!routed) routeset(s, session[s].ip, 0, 0, 0); session[s].ip = 0; } else free_ip_address(s); - - if (session[s].throttle) // Unthrottle if throttled. - throttle_session(s, 0); } + + if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled. + throttle_session(s, 0, 0); + { // Send CDN controlt *c = controlnew(14); // sending CDN control16(c, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message control16(c, 14, s, 1); // assigned session (our end) controladd(c, session[s].tunnel, s); // send the message } + + if (!session[s].die) + session[s].die = now() + 150; // Clean up in 15 seconds + + // update filter refcounts + if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--; + if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--; + cluster_send_session(s); } @@ -1152,67 +1133,77 @@ void sendipcp(tunnelidt t, sessionidt s) u8 buf[MAXCONTROL]; u16 r = session[s].radius; u8 *q; -#ifdef STAT_CALLS - STAT(call_sendipcp); -#endif + + CSTAT(call_sendipcp); + if (!r) r = radiusnew(s); + if (radius[r].state != RADIUSIPCP) { radius[r].state = RADIUSIPCP; radius[r].try = 0; } + radius[r].retry = backoff(radius[r].try++); if (radius[r].try > 10) { + radiusclear(r, s); // Clear radius session. sessionshutdown(s, "No reply on IPCP"); return; } q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP); - if (!q) { - log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n"); - return; - } + if (!q) return; *q = ConfigReq; q[1] = r << RADIUS_SHIFT; // ID, dont care, we only send one type of request *(u16 *) (q + 2) = htons(10); q[4] = 3; q[5] = 6; - *(u32 *) (q + 6) = config->bind_address; // send my IP + *(u32 *) (q + 6) = config->peer_address ? config->peer_address : + config->bind_address ? config->bind_address : + my_address; // send my IP + tunnelsend(buf, 10 + (q - buf), t); // send it session[s].flags &= ~SF_IPCP_ACKED; // Clear flag. } // kill a session now -void sessionkill(sessionidt s, char *reason) +static void sessionkill(sessionidt s, char *reason) { -#ifdef STAT_CALLS - STAT(call_sessionkill); -#endif + + CSTAT(call_sessionkill); + + session[s].die = now(); sessionshutdown(s, reason); // close radius/routes, etc. if (session[s].radius) - radiusclear(session[s].radius, 0); // cant send clean accounting data, session is killed - log(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason); + radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed - throttle_session(s, 0); // Force session to be un-throttle. Free'ing TBF structures. + LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason); memset(&session[s], 0, sizeof(session[s])); session[s].tunnel = T_FREE; // Mark it as free. session[s].next = sessionfree; sessionfree = s; + cli_session_actions[s].action = 0; cluster_send_session(s); } +static void tunnelclear(tunnelidt t) +{ + if (!t) return; + memset(&tunnel[t], 0, sizeof(tunnel[t])); + tunnel[t].state = TUNNELFREE; +} + // kill a tunnel now -void tunnelkill(tunnelidt t, char *reason) +static void tunnelkill(tunnelidt t, char *reason) { sessionidt s; controlt *c; -#ifdef STAT_CALLS - STAT(call_tunnelkill); -#endif + + CSTAT(call_tunnelkill); tunnel[t].state = TUNNELDIE; @@ -1232,31 +1223,30 @@ void tunnelkill(tunnelidt t, char *reason) // free tunnel tunnelclear(t); + LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason); + cli_tunnel_actions[s].action = 0; cluster_send_tunnel(t); - log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason); - tunnel[t].die = 0; - tunnel[t].state = TUNNELFREE; } // shut down a tunnel cleanly -void tunnelshutdown(tunnelidt t, char *reason) +static void tunnelshutdown(tunnelidt t, char *reason) { sessionidt s; -#ifdef STAT_CALLS - STAT(call_tunnelshutdown); -#endif + + CSTAT(call_tunnelshutdown); + if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE) { // never set up, can immediately kill tunnelkill(t, reason); return; } - log(1, 0, 0, t, "Shutting down tunnel %d (%s)\n", t, reason); + LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason); // close session for (s = 1; s < MAXSESSION; s++) if (session[s].tunnel == t) - sessionkill(s, reason); + sessionshutdown(s, reason); tunnel[t].state = TUNNELDIE; tunnel[t].die = now() + 700; // Clean up in 70 seconds @@ -1277,23 +1267,23 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) u16 l = len, t = 0, s = 0, ns = 0, nr = 0; u8 *p = buf + 2; -#ifdef STAT_CALLS - STAT(call_processudp); -#endif + + CSTAT(call_processudp); + udp_rx += len; udp_rx_pkt++; - log_hex(5, "UDP Data", buf, len); + LOG_HEX(5, "UDP Data", buf, len); STAT(tunnel_rx_packets); INC_STAT(tunnel_rx_bytes, len); if (len < 6) { - log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Short UDP, %d bytes\n", len); + LOG(1, 0, 0, "Short UDP, %d bytes\n", len); STAT(tunnel_rx_errors); return; } if ((buf[1] & 0x0F) != 2) { - log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2); + LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2); STAT(tunnel_rx_errors); return; } @@ -1308,13 +1298,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) p += 2; if (s >= MAXSESSION) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid session ID\n"); + LOG(1, s, t, "Received UDP packet with invalid session ID\n"); STAT(tunnel_rx_errors); return; } if (t >= MAXTUNNEL) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n"); + LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n"); STAT(tunnel_rx_errors); return; } @@ -1332,7 +1322,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } if ((p - buf) > l) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad length %d>%d\n", (p - buf), l); + LOG(1, s, t, "Bad length %d>%d\n", (p - buf), l); STAT(tunnel_rx_errors); return; } @@ -1351,41 +1341,48 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) char called[MAXTEL] = ""; // called number char calling[MAXTEL] = ""; // calling number - if (!config->cluster_iam_master) { + if (!config->cluster_iam_master) + { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } if ((*buf & 0xCA) != 0xC8) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad control header %02X\n", *buf); + LOG(1, s, t, "Bad control header %02X\n", *buf); STAT(tunnel_rx_errors); return; } - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n", - l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr); - // if no tunnel specified, assign one - if (!t) + + // check for duplicate tunnel open message + if (!t && ns == 0) { int i; // // Is this a duplicate of the first packet? (SCCRQ) // - for ( i = 1; i <= config->cluster_highest_tunnelid ; ++i) { - if (tunnel[t].state != TUNNELOPENING || - tunnel[t].ip != ntohl(*(ipt *) & addr->sin_addr) || - tunnel[t].port != ntohs(addr->sin_port) ) + for (i = 1; i <= config->cluster_highest_tunnelid ; ++i) + { + if (tunnel[i].state != TUNNELOPENING || + tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) || + tunnel[i].port != ntohs(addr->sin_port) ) continue; t = i; + LOG(3, s, t, "Duplicate SCCRQ?\n"); break; } } - if (!t) { + LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n", + l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr); + + // if no tunnel specified, assign one + if (!t) + { if (!(t = new_tunnel())) { - log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n"); + LOG(1, 0, 0, "No more tunnels\n"); STAT(tunnel_overflow); return; } @@ -1393,8 +1390,27 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) tunnel[t].ip = ntohl(*(ipt *) & addr->sin_addr); tunnel[t].port = ntohs(addr->sin_port); tunnel[t].window = 4; // default window - log(1, ntohl(addr->sin_addr.s_addr), 0, t, " New tunnel from %u.%u.%u.%u/%u ID %d\n", tunnel[t].ip >> 24, tunnel[t].ip >> 16 & 255, tunnel[t].ip >> 8 & 255, tunnel[t].ip & 255, tunnel[t].port, t); STAT(tunnel_created); + LOG(1, 0, t, " New tunnel from %s:%u ID %d\n", + fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t); + } + + // If the 'ns' just received is not the 'nr' we're + // expecting, just send an ack and drop it. + // + // if 'ns' is less, then we got a retransmitted packet. + // if 'ns' is greater than missed a packet. Either way + // we should ignore it. + if (ns != tunnel[t].nr) + { + // is this the sequence we were expecting? + STAT(tunnel_rx_errors); + LOG(1, 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n", + t, ns, tunnel[t].nr); + + if (l) // Is this not a ZLB? + controlnull(t); + return; } // This is used to time out old tunnels @@ -1404,7 +1420,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { int skip = tunnel[t].window; // track how many in-window packets are still in queue // some to clear maybe? - while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) + while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) { controlt *c = tunnel[t].controls; tunnel[t].controls = c->next; @@ -1415,22 +1431,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) tunnel[t].try = 0; // we have progress } - // If the 'ns' just received is not the 'nr' we're - // expecting, just send an ack and drop it. - // - // if 'ns' is less, then we got a retransmitted packet. - // if 'ns' is greater than missed a packet. Either way - // we should ignore it. - if (ns != tunnel[t].nr) - { - // is this the sequence we were expecting? - log(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n", t, ns, tunnel[t].nr); - STAT(tunnel_rx_errors); - - if (l) // Is this not a ZLB? - controlnull(t); - return; - } // receiver advance (do here so quoted correctly in any sends below) if (l) tunnel[t].nr = (ns + 1); if (skip < 0) skip = 0; @@ -1467,7 +1467,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) p += n; // next if (l < n) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Invalid length in AVP\n"); + LOG(1, s, t, "Invalid length in AVP\n"); STAT(tunnel_rx_errors); fatal = flags; return; @@ -1478,28 +1478,35 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // handle hidden AVPs if (!*config->l2tpsecret) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n"); + LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n"); fatal = flags; continue; } if (!session[s].random_vector_length) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no random vector.\n"); + LOG(1, s, t, "Hidden AVP requested, but no random vector.\n"); + fatal = flags; + continue; + } + LOG(4, s, t, "Hidden AVP\n"); + // Unhide the AVP + n = unhide_avp(b, t, s, n); + if (n == 0) + { fatal = flags; continue; } - log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n"); } if (*b & 0x3C) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unrecognised AVP flags %02X\n", *b); + LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b); fatal = flags; continue; // next } b += 2; if (*(u16 *) (b)) { - log(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b))); + LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b))); fatal = flags; continue; // next } @@ -1508,124 +1515,127 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) b += 2; n -= 6; - log(4, ntohl(addr->sin_addr.s_addr), s, t, " AVP %d (%s) len %d\n", mtype, avpnames[mtype], n); + LOG(4, s, t, " AVP %d (%s) len %d\n", mtype, avpnames[mtype], n); switch (mtype) { case 0: // message type message = ntohs(*(u16 *) b); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Message type = %d (%s)\n", *b, - l2tp_message_types[message]); + LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_message_types[message]); mandatorymessage = flags; break; case 1: // result code { u16 rescode = ntohs(*(u16 *)(b)); const char* resdesc = "(unknown)"; - if (message == 4) { /* StopCCN */ + if (message == 4) + { /* StopCCN */ if (rescode <= MAX_STOPCCN_RESULT_CODE) resdesc = stopccn_result_codes[rescode]; - } else if (message == 14) { /* CDN */ + } + else if (message == 14) + { /* CDN */ if (rescode <= MAX_CDN_RESULT_CODE) resdesc = cdn_result_codes[rescode]; } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Result Code %d: %s\n", - rescode, resdesc); - if (n >= 4) { + LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc); + if (n >= 4) + { u16 errcode = ntohs(*(u16 *)(b + 2)); const char* errdesc = "(unknown)"; if (errcode <= MAX_ERROR_CODE) errdesc = error_codes[errcode]; - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error Code %d: %s\n", - errcode, errdesc); - } - if (n > 4) { - /* %*s doesn't work?? */ - char *buf = (char *)strndup(b+4, n-4); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %s\n", - buf); - free(buf); + LOG(4, s, t, " Error Code %d: %s\n", errcode, errdesc); } + if (n > 4) + LOG(4, s, t, " Error String: %.*s\n", n-4, b+4); + break; } break; case 2: // protocol version { version = ntohs(*(u16 *) (b)); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Protocol version = %d\n", version); + LOG(4, s, t, " Protocol version = %d\n", version); if (version && version != 0x0100) { // allow 0.0 and 1.0 - log(1, ntohl(addr->sin_addr.s_addr), s, t, " Bad protocol version %04X\n", - version); + LOG(1, s, t, " Bad protocol version %04X\n", version); fatal = flags; continue; // next } } break; case 3: // framing capabilities -// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n"); +// LOG(4, s, t, "Framing capabilities\n"); break; case 4: // bearer capabilities -// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n"); +// LOG(4, s, t, "Bearer capabilities\n"); break; case 5: // tie breaker // We never open tunnels, so we don't care about tie breakers -// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n"); +// LOG(4, s, t, "Tie breaker\n"); continue; case 6: // firmware revision -// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n"); +// LOG(4, s, t, "Firmware revision\n"); break; case 7: // host name memset(tunnel[t].hostname, 0, 128); memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname); + LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname); // TBA - to send to RADIUS break; case 8: // vendor name - memset(tunnel[t].vendor, 0, 128); - memcpy(tunnel[t].vendor, b, (n >= 127) ? 127 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); + memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor)); + memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n); + LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); break; case 9: // assigned tunnel tunnel[t].far = ntohs(*(u16 *) (b)); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Remote tunnel id = %d\n", tunnel[t].far); + LOG(4, s, t, " Remote tunnel id = %d\n", tunnel[t].far); break; case 10: // rx window tunnel[t].window = ntohs(*(u16 *) (b)); if (!tunnel[t].window) tunnel[t].window = 1; // window of 0 is silly - log(4, ntohl(addr->sin_addr.s_addr), s, t, " rx window = %d\n", tunnel[t].window); + LOG(4, s, t, " rx window = %d\n", tunnel[t].window); break; case 11: // Challenge { - log(4, ntohl(addr->sin_addr.s_addr), s, t, " LAC requested CHAP authentication for tunnel\n"); + LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n"); build_chap_response(b, 2, n, &chapresponse); } break; + case 13: // Response + // Why did they send a response? We never challenge. + LOG(2, s, t, " received unexpected challenge response\n"); + break; + case 14: // assigned session asession = session[s].far = ntohs(*(u16 *) (b)); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " assigned session = %d\n", asession); + LOG(4, s, t, " assigned session = %d\n", asession); break; case 15: // call serial number - log(4, ntohl(addr->sin_addr.s_addr), s, t, " call serial number = %d\n", ntohl(*(u32 *)b)); + LOG(4, s, t, " call serial number = %d\n", ntohl(*(u32 *)b)); break; case 18: // bearer type - log(4, ntohl(addr->sin_addr.s_addr), s, t, " bearer type = %d\n", ntohl(*(u32 *)b)); + LOG(4, s, t, " bearer type = %d\n", ntohl(*(u32 *)b)); // TBA - for RADIUS break; case 19: // framing type - log(4, ntohl(addr->sin_addr.s_addr), s, t, " framing type = %d\n", ntohl(*(u32 *)b)); + LOG(4, s, t, " framing type = %d\n", ntohl(*(u32 *)b)); // TBA break; case 21: // called number memset(called, 0, MAXTEL); memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Called <%s>\n", called); + LOG(4, s, t, " Called <%s>\n", called); break; case 22: // calling number memset(calling, 0, MAXTEL); memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Calling <%s>\n", calling); + LOG(4, s, t, " Calling <%s>\n", calling); + break; + case 23: // subtype break; case 24: // tx connect speed if (n == 4) @@ -1639,8 +1649,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) memcpy(tmp, b, (n >= 30) ? 30 : n); session[s].tx_connect_speed = atol(tmp); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " TX connect speed <%u>\n", - session[s].tx_connect_speed); + LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed); break; case 38: // rx connect speed if (n == 4) @@ -1654,20 +1663,18 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) memcpy(tmp, b, (n >= 30) ? 30 : n); session[s].rx_connect_speed = atol(tmp); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " RX connect speed <%u>\n", - session[s].rx_connect_speed); + LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed); break; case 25: // Physical Channel ID { u32 tmp = ntohl(*(u32 *)b); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Physical Channel ID <%X>\n", tmp); + LOG(4, s, t, " Physical Channel ID <%X>\n", tmp); break; } case 29: // Proxy Authentication Type { u16 authtype = ntohs(*(u16 *)b); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Type %d (%s)\n", - authtype, authtypes[authtype]); + LOG(4, s, t, " Proxy Auth Type %d (%s)\n", authtype, authtypes[authtype]); requestchap = (authtype == 2); break; } @@ -1675,21 +1682,20 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { char authname[64] = {0}; memcpy(authname, b, (n > 63) ? 63 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Name (%s)\n", + LOG(4, s, t, " Proxy Auth Name (%s)\n", authname); break; } case 31: // Proxy Authentication Challenge { memcpy(radius[session[s].radius].auth, b, 16); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Challenge\n"); + LOG(4, s, t, " Proxy Auth Challenge\n"); break; } case 32: // Proxy Authentication ID { u16 authid = ntohs(*(u16 *)(b)); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth ID (%d)\n", - authid); + LOG(4, s, t, " Proxy Auth ID (%d)\n", authid); if (session[s].radius) radius[session[s].radius].id = authid; break; @@ -1698,56 +1704,40 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { char authresp[64] = {0}; memcpy(authresp, b, (n > 63) ? 63 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Response\n"); + LOG(4, s, t, " Proxy Auth Response\n"); break; } case 27: // last send lcp { // find magic number u8 *p = b, *e = p + n; - while (p < e && p[1]) + while (p + 1 < e && p[1] && p + p[1] <= e) { - if (*p == 5 && p[1] == 6) + if (*p == 5 && p[1] == 6) // Magic-Number amagic = ntohl(*(u32 *) (p + 2)); - else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5) + else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol chap = 1; - else if (*p == 7) + else if (*p == 7) // Protocol-Field-Compression aflags |= SESSIONPFC; - else if (*p == 8) + else if (*p == 8) // Address-and-Control-Field-Compression aflags |= SESSIONACFC; p += p[1]; } - - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - } } break; case 28: // last recv lcp confreq - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - break; - } + break; case 26: // Initial Received LCP CONFREQ - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - } break; case 39: // seq required - we control it as an LNS anyway... break; case 36: // Random Vector - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Random Vector received. Enabled AVP Hiding.\n"); + LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n"); memset(session[s].random_vector, 0, sizeof(session[s].random_vector)); memcpy(session[s].random_vector, b, n); session[s].random_vector_length = n; break; default: - log(2, ntohl(addr->sin_addr.s_addr), s, t, " Unknown AVP type %d\n", mtype); + LOG(2, s, t, " Unknown AVP type %d\n", mtype); fatal = flags; continue; // next } @@ -1815,8 +1805,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // make a RADIUS session if (!(r = radiusnew(s))) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n"); -// sessionkill(s, "no free RADIUS sesions"); + LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); + sessionkill(s, "no free RADIUS sesions"); return; } @@ -1826,7 +1816,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) session[s].tunnel = t; session[s].far = asession; session[s].last_packet = time_now; - log(3, ntohl(addr->sin_addr.s_addr), s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far); + LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far); control16(c, 14, s, 1); // assigned session controladd(c, t, s); // send the reply { @@ -1845,9 +1835,10 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // TBA break; case 12: // ICCN + if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number session[s].l2tp_flags = aflags; // set flags received - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags); + LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags); controlnull(t); // ack // In CHAP state, request PAP instead if (requestchap) @@ -1858,14 +1849,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) sessionshutdown(s, "Closed (Received CDN)"); break; case 0xFFFF: - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Missing message type\n"); + LOG(1, s, t, "Missing message type\n"); break; default: STAT(tunnel_rx_errors); if (mandatorymessage & 0x80) tunnelshutdown(t, "Unknown message"); else - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown message type %d\n", message); + LOG(1, s, t, "Unknown message type %d\n", message); break; } if (chapresponse) free(chapresponse); @@ -1873,14 +1864,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else { - log(4, 0, s, t, " Got a ZLB ack\n"); + LOG(4, s, t, " Got a ZLB ack\n"); } } else { // data u16 prot; - log_hex(5, "Receive Tunnel Data", p, l); + LOG_HEX(5, "Receive Tunnel Data", p, l); if (l > 2 && p[0] == 0xFF && p[1] == 0x03) { // HDLC address header, discard p += 2; @@ -1888,7 +1879,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } if (l < 2) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Short ppp length %d\n", l); + LOG(1, s, t, "Short ppp length %d\n", l); STAT(tunnel_rx_errors); return; } @@ -1914,16 +1905,16 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } - log(1, ntohl(addr->sin_addr.s_addr), s, t, "UDP packet contains session %d " - "but no session[%d].tunnel exists (LAC said" - " tunnel = %d). Dropping packet.\n", s, s, t); + LOG(1, s, t, "UDP packet contains session %d but no session[%d].tunnel " + "exists (LAC said tunnel = %d). Dropping packet.\n", s, s, t); + STAT(tunnel_rx_errors); return; } if (session[s].die) { - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Session %d is closing. Don't process PPP packets\n", s); + LOG(3, s, t, "Session %d is closing. Don't process PPP packets\n", s); // I'm pretty sure this isn't right -- mo. // return; // closing session, PPP not processed } @@ -1959,57 +1950,41 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else if (prot == PPPIP) { - if (!config->cluster_iam_master) + session[s].last_packet = time_now; + if (session[s].walled_garden && !config->cluster_iam_master) { - // We're a slave. Should we forward this packet to the master? - - // Is this a walled garden session, or something that needs it's - // idle time updated?? - - // Maintain the idle timeouts on the master. If this would - // significantly reset the idletimeout, run it via the master - // to refresh the master's idle timer. - // Not sure this is ideal: It may re-order packets. - - if (session[s].walled_garden || (session[s].last_packet + (ECHO_TIMEOUT/2)) < time_now) - { - master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); - session[s].last_packet = time_now; - return; - } - // fall through to processipin. - } else - session[s].last_packet = time_now; + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } processipin(t, s, p, l); } else { STAT(tunnel_rx_errors); - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot); + LOG(1, s, t, "Unknown PPP protocol %04X\n", prot); } } } -// read and process packet on tap -void processtap(u8 * buf, int len) +// read and process packet on tun +static void processtun(u8 * buf, int len) { - log_hex(5, "Receive TAP Data", buf, len); - STAT(tap_rx_packets); - INC_STAT(tap_rx_bytes, len); -#ifdef STAT_CALLS - STAT(call_processtap); -#endif + LOG_HEX(5, "Receive TUN Data", buf, len); + STAT(tun_rx_packets); + INC_STAT(tun_rx_bytes, len); + + CSTAT(call_processtun); + eth_rx_pkt++; eth_rx += len; if (len < 22) { - log(1, 0, 0, 0, "Short tap packet %d bytes\n", len); - STAT(tap_rx_errors); + LOG(1, 0, 0, "Short tun packet %d bytes\n", len); + STAT(tun_rx_errors); return; } - if (*(u16 *) (buf + 2) == htons(PKTARP)) // ARP - processarp(buf, len); - else if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP + + if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP processipout(buf, len); // Else discard. } @@ -2020,15 +1995,16 @@ void processtap(u8 * buf, int len) // at once. #define MAX_ACTIONS 500 -int regular_cleanups(void) +static int regular_cleanups(void) { static sessionidt s = 0; // Next session to check for actions on. tunnelidt t; int count=0,i; u16 r; static clockt next_acct = 0; + int a; - log(3, 0, 0, 0, "Begin regular cleanup\n"); + LOG(3, 0, 0, "Begin regular cleanup\n"); for (r = 1; r < MAXRADIUS; r++) { @@ -2036,15 +2012,15 @@ int regular_cleanups(void) continue; if (radius[r].retry) { - if (radius[r].retry <= config->current_time) + if (radius[r].retry <= TIME) radiusretry(r); } else radius[r].retry = backoff(radius[r].try+1); // Is this really needed? --mo } - for (t = 1; t < config->cluster_highest_tunnelid; t++) + for (t = 1; t <= config->cluster_highest_tunnelid; t++) { // check for expired tunnels - if (tunnel[t].die && tunnel[t].die <= config->current_time) + if (tunnel[t].die && tunnel[t].die <= TIME) { STAT(tunnel_timeout); tunnelkill(t, "Expired"); @@ -2054,7 +2030,7 @@ int regular_cleanups(void) if (tunnel[t].retry && tunnel[t].controlc) { // resend pending messages as timeout on reply - if (tunnel[t].retry <= config->current_time) + if (tunnel[t].retry <= TIME) { controlt *c = tunnel[t].controls; u8 w = tunnel[t].window; @@ -2070,57 +2046,45 @@ int regular_cleanups(void) } } // Send hello - if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < config->current_time + 600) + if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600) { controlt *c = controlnew(6); // sending HELLO controladd(c, t, 0); // send the message - log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n"); + LOG(3, 0, t, "Sending HELLO message\n"); } - } - // Check for sessions that have been killed from the CLI - if (cli_session_kill[0]) - { - int i; - for (i = 0; i < MAXSESSION && cli_session_kill[i]; i++) - { - log(2, 0, cli_session_kill[i], 0, "Dropping session by CLI\n"); - sessionshutdown(cli_session_kill[i], "Requested by administrator"); - cli_session_kill[i] = 0; - } - } - // Check for tunnels that have been killed from the CLI - if (cli_tunnel_kill[0]) - { - int i; - for (i = 1; i < MAXTUNNEL && cli_tunnel_kill[i]; i++) + // Check for tunnel changes requested from the CLI + if ((a = cli_tunnel_actions[t].action)) { - log(2, 0, cli_tunnel_kill[i], 0, "Dropping tunnel by CLI\n"); - tunnelshutdown(cli_tunnel_kill[i], "Requested by administrator"); - cli_tunnel_kill[i] = 0; + cli_tunnel_actions[t].action = 0; + if (a & CLI_TUN_KILL) + { + LOG(2, 0, t, "Dropping tunnel by CLI\n"); + tunnelshutdown(t, "Requested by administrator"); + } } + } count = 0; - for (i = 1; i < config->cluster_highest_sessionid; i++) + for (i = 1; i <= config->cluster_highest_sessionid; i++) { - s++; - if (s >= config->cluster_highest_sessionid) + if (s > config->cluster_highest_sessionid) s = 1; if (!session[s].tunnel) // Session isn't in use continue; - if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED) ) + if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) { // IPCP has not completed yet. Resend - log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); + LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); sendipcp(session[s].tunnel, s); } // check for expired sessions - if (session[s].die && session[s].die <= config->current_time) + if (session[s].die && session[s].die <= TIME) { sessionkill(s, "Expired"); if (++count >= MAX_ACTIONS) break; @@ -2142,57 +2106,136 @@ int regular_cleanups(void) u8 b[MAXCONTROL] = {0}; u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); - if (!q) { - log(3, session[s].ip, s, t, "failed to send ECHO packet.\n"); - continue; - } + if (!q) continue; *q = EchoReq; *(u8 *)(q + 1) = (time_now % 255); // ID *(u16 *)(q + 2) = htons(8); // Length *(u32 *)(q + 4) = 0; // Magic Number (not supported) - log(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n", + LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n", (int)(time_now - session[s].last_packet)); tunnelsend(b, 24, session[s].tunnel); // send it if (++count >= MAX_ACTIONS) break; - continue; } - } - if (config->accounting_dir && next_acct <= config->current_time) - { - // Dump accounting data - next_acct = config->current_time + ACCT_TIME; - dump_acct_info(); - } - if (count >= MAX_ACTIONS) - return 1; // Didn't finish! - - log(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval); - return 0; -} + // Check for actions requested from the CLI + if ((a = cli_session_actions[s].action)) + { + int send = 0; + + cli_session_actions[s].action = 0; + if (a & CLI_SESS_KILL) + { + LOG(2, s, session[s].tunnel, "Dropping session by CLI\n"); + sessionshutdown(s, "Requested by administrator"); + a = 0; // dead, no need to check for other actions + } + + if (a & CLI_SESS_NOSNOOP) + { + LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n"); + session[s].snoop_ip = 0; + session[s].snoop_port = 0; + send++; + } + else if (a & CLI_SESS_SNOOP) + { + LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n", + fmtaddr(cli_session_actions[s].snoop_ip, 0), + cli_session_actions[s].snoop_port); + + session[s].snoop_ip = cli_session_actions[s].snoop_ip; + session[s].snoop_port = cli_session_actions[s].snoop_port; + send++; + } + + if (a & CLI_SESS_NOTHROTTLE) + { + LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n"); + throttle_session(s, 0, 0); + send++; + } + else if (a & CLI_SESS_THROTTLE) + { + LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n", + cli_session_actions[s].throttle_in, + cli_session_actions[s].throttle_out); + + throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out); + send++; + } + + if (a & CLI_SESS_NOFILTER) + { + LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n"); + filter_session(s, 0, 0); + send++; + } + else if (a & CLI_SESS_FILTER) + { + LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n", + cli_session_actions[s].filter_in, + cli_session_actions[s].filter_out); + + filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out); + send++; + } + + if (send) + cluster_send_session(s); + + if (++count >= MAX_ACTIONS) break; + } + } + + if (*config->accounting_dir && next_acct <= TIME) + { + // Dump accounting data + next_acct = TIME + ACCT_TIME; + dump_acct_info(); + } + + if (count >= MAX_ACTIONS) + return 1; // Didn't finish! + + LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval); + return 0; +} // // Are we in the middle of a tunnel update, or radius // requests?? // -int still_busy(void) +static int still_busy(void) { int i; - static int last_talked = 0; - for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) { + static clockt last_talked = 0; + static clockt start_busy_wait = 0; + if (start_busy_wait == 0) + start_busy_wait = TIME; + + for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) + { if (!tunnel[i].controlc) continue; - if (last_talked != config->current_time) { - log(2,0,0,0, "Tunnel %d still has an-acked control messages.\n", i); - last_talked = config->current_time; + if (last_talked != TIME) + { + LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i); + last_talked = TIME; } return 1; } + // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds + if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME) + { + LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); + return 0; + } + for (i = 1; i < MAXRADIUS; i++) { if (radius[i].state == RADIUSNULL) @@ -2200,9 +2243,10 @@ int still_busy(void) if (radius[i].state == RADIUSWAIT) continue; - if (last_talked != config->current_time) { - log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); - last_talked = config->current_time; + if (last_talked != TIME) + { + LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); + last_talked = TIME; } return 1; } @@ -2210,42 +2254,37 @@ int still_busy(void) return 0; } -// main loop - gets packets on tap or udp and processes them -void mainloop(void) +static fd_set readset; +static int readset_n = 0; + +// main loop - gets packets on tun or udp and processes them +static void mainloop(void) { - fd_set cr; - int cn, i; + int i; u8 buf[65536]; struct timeval to; - time_t next_cluster_ping = 0; // default 1 second pings. - clockt next_clean = time_now + config->cleanup_interval; - - log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tapfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tapfd, cluster_sockfd, controlfd); - - FD_ZERO(&cr); - FD_SET(udpfd, &cr); - FD_SET(tapfd, &cr); - FD_SET(controlfd, &cr); - FD_SET(clifd, &cr); - if (cluster_sockfd) FD_SET(cluster_sockfd, &cr); - cn = udpfd; - if (cn < tapfd) cn = tapfd; - if (cn < controlfd) cn = controlfd; - if (cn < clifd) cn = clifd; - if (cn < cluster_sockfd) cn = cluster_sockfd; - for (i = 0; i < config->num_radfds; i++) - { - if (!radfds[i]) continue; - FD_SET(radfds[i], &cr); - if (radfds[i] > cn) - cn = radfds[i]; - } + clockt next_cluster_ping = 0; // send initial ping immediately + time_t next_clean = time_now + config->cleanup_interval; + + LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n", + udpfd, tunfd, cluster_sockfd, controlfd); + + FD_ZERO(&readset); + FD_SET(udpfd, &readset); + FD_SET(tunfd, &readset); + FD_SET(controlfd, &readset); + FD_SET(clifd, &readset); + if (cluster_sockfd) FD_SET(cluster_sockfd, &readset); + readset_n = udpfd; + if (tunfd > readset_n) readset_n = tunfd; + if (controlfd > readset_n) readset_n = controlfd; + if (clifd > readset_n) readset_n = clifd; + if (cluster_sockfd > readset_n) readset_n = cluster_sockfd; while (!main_quit || still_busy()) { fd_set r; - int n = cn; + int n = readset_n; #ifdef BGP fd_set w; int bgp_set[BGP_NUM_PEERS]; @@ -2257,7 +2296,7 @@ void mainloop(void) update_config(); } - memcpy(&r, &cr, sizeof(fd_set)); + memcpy(&r, &readset, sizeof(fd_set)); to.tv_sec = 0; to.tv_usec = 100000; // 1/10th of a second. @@ -2286,13 +2325,14 @@ void mainloop(void) n = select(n + 1, &r, 0, 0, &to); #endif /* BGP */ - config->current_time = now(); + TIME = now(); if (n < 0) { - if (errno == EINTR) + if (errno == EINTR || + errno == ECHILD) // EINTR was clobbered by sigchild_handler() continue; - log(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); + LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); main_quit++; break; } @@ -2311,27 +2351,33 @@ void mainloop(void) break; } } - if (FD_ISSET(tapfd, &r)) + if (FD_ISSET(tunfd, &r)) { int c, n; for (c = 0; c < config->multi_read_count; c++) { - if ((n = read(tapfd, buf, sizeof(buf))) > 0) - processtap(buf, n); + if ((n = read(tunfd, buf, sizeof(buf))) > 0) + processtun(buf, n); else break; } } - for (i = 0; i < config->num_radfds; i++) - if (FD_ISSET(radfds[i], &r)) - processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); - if (FD_ISSET(cluster_sockfd, &r)) { + + if (config->cluster_iam_master) + for (i = 0; i < config->num_radfds; i++) + if (FD_ISSET(radfds[i], &r)) + processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); + + if (FD_ISSET(cluster_sockfd, &r)) + { int size; size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen); processcluster(buf, size, addr.sin_addr.s_addr); } + if (FD_ISSET(controlfd, &r)) - processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr); + processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + if (FD_ISSET(clifd, &r)) { struct sockaddr_in addr; @@ -2340,7 +2386,7 @@ void mainloop(void) if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0) { - log(0, 0, 0, 0, "accept error: %s\n", strerror(errno)); + LOG(0, 0, 0, "accept error: %s\n", strerror(errno)); continue; } else @@ -2352,16 +2398,22 @@ void mainloop(void) } // Runs on every machine (master and slaves). - if (cluster_sockfd && next_cluster_ping <= time_now) + if (cluster_sockfd && next_cluster_ping <= TIME) { // Check to see which of the cluster is still alive.. - next_cluster_ping = time_now + 1; - cluster_send_ping(basetime); - cluster_check_master(); + cluster_send_ping(basetime); // Only does anything if we're a slave + cluster_check_master(); // ditto. + + cluster_heartbeat(); // Only does anything if we're a master. + cluster_check_slaves(); // ditto. - cluster_heartbeat(config->cluster_highest_sessionid, sessionfree, config->cluster_highest_tunnelid); // Only does anything if we're a master. master_update_counts(); // If we're a slave, send our byte counters to our master. + + if (config->cluster_iam_master && !config->cluster_iam_uptodate) + next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates + else + next_cluster_ping = TIME + config->cluster_hb_interval; } // Run token bucket filtering queue.. @@ -2369,8 +2421,9 @@ void mainloop(void) // Runs on all machines both master and slave. { static clockt last_run = 0; - if (last_run != config->current_time) { - last_run = config->current_time; + if (last_run != TIME) + { + last_run = TIME; tbf_run_timer(); } } @@ -2379,10 +2432,15 @@ void mainloop(void) * something to read, else under load this will never actually run.... * */ - if (config->cluster_iam_master && next_clean <= time_now) { - if (regular_cleanups()) { // Did it finish? + if (config->cluster_iam_master && next_clean <= time_now) + { + if (regular_cleanups()) + { + // Did it finish? next_clean = time_now + 1 ; // Didn't finish. Check quickly. - } else { + } + else + { next_clean = time_now + config->cleanup_interval; // Did. Move to next interval. } } @@ -2398,11 +2456,8 @@ void mainloop(void) } // Are we the master and shutting down?? - if (config->cluster_iam_master) { - - cluster_heartbeat(config->cluster_highest_sessionid, sessionfree, - config->cluster_highest_tunnelid); // Flush any queued changes.. - } + if (config->cluster_iam_master) + cluster_heartbeat(); // Flush any queued changes.. // Ok. Notify everyone we're shutting down. If we're // the master, this will force an election. @@ -2412,82 +2467,151 @@ void mainloop(void) // Important!!! We MUST not process any packets past this point! } +static void stripdomain(char *host) +{ + char *p; + + if ((p = strchr(host, '.'))) + { + char *domain = 0; + char _domain[1024]; + + // strip off domain + FILE *resolv = fopen("/etc/resolv.conf", "r"); + if (resolv) + { + char buf[1024]; + char *b; + + while (fgets(buf, sizeof(buf), resolv)) + { + if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6)) + continue; + + if (!isspace(buf[6])) + continue; + + b = buf + 7; + while (isspace(*b)) b++; + + if (*b) + { + char *d = b; + while (*b && !isspace(*b)) b++; + *b = 0; + if (buf[0] == 'd') // domain is canonical + { + domain = d; + break; + } + + // first search line + if (!domain) + { + // hold, may be subsequent domain line + strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0; + domain = _domain; + } + } + } + + fclose(resolv); + } + + if (domain) + { + int hl = strlen(host); + int dl = strlen(domain); + if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain)) + host[hl -dl - 1] = 0; + } + else + { + *p = 0; // everything after first dot + } + } +} + // Init data structures -void initdata(void) +static void initdata(int optdebug, char *optconfig) { int i; - _statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (_statistics == MAP_FAILED) + if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) { - log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); exit(1); } - config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (config == MAP_FAILED) + if (!(config = shared_malloc(sizeof(configt)))) { - log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno)); exit(1); } - memset(config, 0, sizeof(struct configt)); + memset(config, 0, sizeof(configt)); time(&config->start_time); - strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1); - tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (tunnel == MAP_FAILED) + strncpy(config->config_file, optconfig, strlen(optconfig)); + config->debug = optdebug; + config->num_tbfs = MAXTBFS; + config->rl_rate = 28; // 28kbps + + if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL))) { - log(0, 0, 0, 0, "Error doing mmap for tunnels: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); exit(1); } - session = mmap(NULL, sizeof(sessiont) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (session == MAP_FAILED) + if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); exit(1); } - sess_count = mmap(NULL, sizeof(sessioncountt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (sess_count == MAP_FAILED) + if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for sessions_count: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno)); exit(1); } - radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (radius == MAP_FAILED) + if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS))) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); exit(1); } - ip_address_pool = mmap(NULL, sizeof(ippoolt) * MAXIPPOOL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ip_address_pool == MAP_FAILED) + + if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL))) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno)); exit(1); } + +if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER))) +{ + LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno)); + exit(1); +} +memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER); + #ifdef RINGBUFFER - ringbuffer = mmap(NULL, sizeof(struct Tringbuffer), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ringbuffer == MAP_FAILED) + if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); exit(1); } memset(ringbuffer, 0, sizeof(struct Tringbuffer)); #endif - cli_session_kill = mmap(NULL, sizeof(sessionidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_session_kill == MAP_FAILED) + if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for cli session kill: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno)); exit(1); } - memset(cli_session_kill, 0, sizeof(sessionidt) * MAXSESSION); - cli_tunnel_kill = mmap(NULL, sizeof(tunnelidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_tunnel_kill == MAP_FAILED) + memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION); + + if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for cli tunnel kill: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno)); exit(1); } - memset(cli_tunnel_kill, 0, sizeof(tunnelidt) * MAXSESSION); + memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION); memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL); memset(session, 0, sizeof(sessiont) * MAXSESSION); @@ -2495,7 +2619,8 @@ void initdata(void) memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); // Put all the sessions on the free list marked as undefined. - for (i = 1; i < MAXSESSION - 1; i++) { + for (i = 1; i < MAXSESSION - 1; i++) + { session[i].next = i + 1; session[i].tunnel = T_UNDEF; // mark it as not filled in. } @@ -2503,46 +2628,38 @@ void initdata(void) sessionfree = 1; // Mark all the tunnels as undefined (waiting to be filled in by a download). - for (i = 1; i < MAXTUNNEL- 1; i++) { + for (i = 1; i < MAXTUNNEL- 1; i++) tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. - } if (!*hostname) { // Grab my hostname unless it's been specified gethostname(hostname, sizeof(hostname)); + stripdomain(hostname); } + _statistics->start_time = _statistics->last_reset = time(NULL); #ifdef BGP - bgp_peers = mmap(NULL, sizeof(struct bgp_peer) * BGP_NUM_PEERS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (bgp_peers == MAP_FAILED) + if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS))) { - log(0, 0, 0, 0, "Error doing mmap for bgp: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno)); exit(1); } #endif /* BGP */ } -void initiptables(void) -{ - /* Flush the tables here so that we have a clean slate */ - -// Not needed. 'nat' is setup by garden.c -// mangle isn't used (as throttling is done by tbf inhouse). -} - -int assign_ip_address(sessionidt s) +static int assign_ip_address(sessionidt s) { u32 i; int best = -1; - clockt best_time = time_now; + time_t best_time = time_now; char *u = session[s].user; char reuse = 0; -#ifdef STAT_CALLS - STAT(call_assign_ip_address); -#endif + + CSTAT(call_assign_ip_address); + for (i = 1; i < ip_pool_size; i++) { if (!ip_address_pool[i].address || ip_address_pool[i].assigned) @@ -2565,7 +2682,7 @@ int assign_ip_address(sessionidt s) if (best < 0) { - log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); + LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); return 0; } @@ -2583,16 +2700,19 @@ int assign_ip_address(sessionidt s) strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1); STAT(ip_allocated); - log(4, ip_address_pool[best].address, s, session[s].tunnel, - "assign_ip_address(): %s ip address %d from pool\n", reuse ? "Reusing" : "Allocating", best); + LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n", + reuse ? "Reusing" : "Allocating", best); return 1; } -void free_ip_address(sessionidt s) +static void free_ip_address(sessionidt s) { int i = session[s].ip_pool_index; + + CSTAT(call_free_ip_address); + if (!session[s].ip) return; // what the? @@ -2605,10 +2725,6 @@ void free_ip_address(sessionidt s) ip_address_pool[i].assigned = 0; ip_address_pool[i].session = 0; ip_address_pool[i].last = time_now; - -#ifdef STAT_CALLS - STAT(call_free_ip_address); -#endif } // @@ -2625,7 +2741,8 @@ void rebuild_address_pool(void) // // Zero the IP pool allocation, and build // a map from IP address to pool index. - for (i = 1; i < MAXIPPOOL; ++i) { + for (i = 1; i < MAXIPPOOL; ++i) + { ip_address_pool[i].assigned = 0; ip_address_pool[i].session = 0; if (!ip_address_pool[i].address) @@ -2634,25 +2751,29 @@ void rebuild_address_pool(void) cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index. } - for (i = 0; i < MAXSESSION; ++i) { + for (i = 0; i < MAXSESSION; ++i) + { int ipid; if (!session[i].ip || !session[i].tunnel) continue; ipid = - lookup_ipmap(htonl(session[i].ip)); - if (session[i].ip_pool_index < 0) { // Not allocated out of the pool. + if (session[i].ip_pool_index < 0) + { + // Not allocated out of the pool. if (ipid < 1) // Not found in the pool either? good. continue; - log(0, 0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!", - i, inet_toa(session[i].ip), ipid); + LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n", + i, fmtaddr(session[i].ip, 0), ipid); // Fall through and process it as part of the pool. } - if (ipid > MAXIPPOOL || ipid < 0) { - log(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid); + if (ipid > MAXIPPOOL || ipid < 0) + { + LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid); ipid = -1; session[i].ip_pool_index = ipid; continue; @@ -2670,7 +2791,7 @@ void rebuild_address_pool(void) // // Fix the address pool to match a changed session. // (usually when the master sends us an update). -void fix_address_pool(int sid) +static void fix_address_pool(int sid) { int ipid; @@ -2691,7 +2812,7 @@ void fix_address_pool(int sid) // // Add a block of addresses to the IP pool to hand out. // -void add_to_ip_pool(u32 addr, u32 mask) +static void add_to_ip_pool(u32 addr, u32 mask) { int i; if (mask == 0) @@ -2712,14 +2833,14 @@ void add_to_ip_pool(u32 addr, u32 mask) ++ip_pool_size; if (ip_pool_size >= MAXIPPOOL) { - log(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr)) ); + LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0)); return; } } } // Initialize the IP address pool -void initippool() +static void initippool() { FILE *f; char *p; @@ -2728,7 +2849,7 @@ void initippool() if (!(f = fopen(IPPOOLFILE, "r"))) { - log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); exit(1); } @@ -2747,7 +2868,7 @@ void initippool() src = inet_addr(buf); if (src == INADDR_NONE) { - log(0, 0, 0, 0, "Invalid address pool IP %s", buf); + LOG(0, 0, 0, "Invalid address pool IP %s\n", buf); exit(1); } // This entry is for a specific IP only @@ -2762,18 +2883,20 @@ void initippool() int numbits = 0; u32 start = 0, mask = 0; - log(2, 0, 0, 0, "Adding IP address range %s\n", buf); + LOG(2, 0, 0, "Adding IP address range %s\n", buf); *p++ = 0; if (!*p || !(numbits = atoi(p))) { - log(0, 0, 0, 0, "Invalid pool range %s\n", buf); + LOG(0, 0, 0, "Invalid pool range %s\n", buf); continue; } start = ntohl(inet_addr(pool)); mask = (u32)(pow(2, numbits) - 1) << (32 - numbits); // Add a static route for this pool - log(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start)), 32 + mask); + LOG(5, 0, 0, "Adding route for address pool %s/%u\n", + fmtaddr(htonl(start), 0), 32 + mask); + routeset(0, start, mask, 0, 1); add_to_ip_pool(start, mask); @@ -2785,138 +2908,148 @@ void initippool() } } fclose(f); - log(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); + LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); } void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port) { + struct sockaddr_in snoop_addr = {0}; if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet) return; + snoop_addr.sin_family = AF_INET; snoop_addr.sin_addr.s_addr = destination; snoop_addr.sin_port = ntohs(port); - log(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n", - packet, size, inet_toa(snoop_addr.sin_addr.s_addr), htons(snoop_addr.sin_port)); + LOG(5, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n", + packet, size, fmtaddr(snoop_addr.sin_addr.s_addr, 0), + htons(snoop_addr.sin_port)); + if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0) - log(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno)); + STAT(packets_snooped); } -void dump_acct_info() +static void dump_acct_info() { - char filename[1024]; - char timestr[64]; - time_t t = time(NULL); - int i; - FILE *f = NULL; + char filename[1024]; + char timestr[64]; + time_t t = time(NULL); + int i; + FILE *f = NULL; -#ifdef STAT_CALLS - STAT(call_dump_acct_info); -#endif - strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t)); - snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr); - for (i = 0; i < MAXSESSION; i++) - { - if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden) - continue; - if (!f) + CSTAT(call_dump_acct_info); + + strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t)); + snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr); + + for (i = 0; i < MAXSESSION; i++) { - time_t now = time(NULL); - if (!(f = fopen(filename, "w"))) - { - log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno)); - return; - } - log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename); - fprintf(f, "# dslwatch.pl dump file V1.01\n" - "# host: %s\n" - "# time: %ld\n" - "# uptime: %ld\n" - "# format: username ip qos uptxoctets downrxoctets\n", - hostname, - now, - now - basetime); - } - - log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); - fprintf(f, "%s %s %d %u %u\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (u32)session[i].cin, // uptxoctets - (u32)session[i].cout); // downrxoctets - - session[i].pin = session[i].cin = 0; - session[i].pout = session[i].cout = 0; - } - - if (f) fclose(f); + if (!session[i].opened || !session[i].ip || !(session[i].cin || session[i].cout) || !*session[i].user || session[i].walled_garden) + continue; + if (!f) + { + time_t now = time(NULL); + if (!(f = fopen(filename, "w"))) + { + LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno)); + return ; + } + LOG(3, 0, 0, "Dumping accounting information to %s\n", filename); + fprintf(f, "# dslwatch.pl dump file V1.01\n" + "# host: %s\n" + "# time: %ld\n" + "# uptime: %ld\n" + "# format: username ip qos uptxoctets downrxoctets\n", + hostname, + now, + now - basetime); + } + + LOG(4, 0, 0, "Dumping accounting information for %s\n", session[i].user); + fprintf(f, "%s %s %d %u %u\n", + session[i].user, // username + fmtaddr(htonl(session[i].ip), 0), // ip + (session[i].throttle_in || session[i].throttle_out) ? 2 : 1, // qos + (u32)session[i].cin, // uptxoctets + (u32)session[i].cout); // downrxoctets + + session[i].pin = session[i].cin = 0; + session[i].pout = session[i].cout = 0; + } + + if (f) + fclose(f); } // Main program int main(int argc, char *argv[]) { - int o; - - _program_name = strdup(argv[0]); + int i; + int optdebug = 0; + char *optconfig = CONFIGFILE; time(&basetime); // start clock // scan args - while ((o = getopt(argc, argv, "vc:h:a:")) >= 0) + while ((i = getopt(argc, argv, "dvc:h:")) >= 0) { - switch (o) + switch (i) { - case 'd': - // Double fork to detach from terminal - if (fork()) exit(0); - if (fork()) exit(0); - break; - case 'v': - config->debug++; - break; - case 'h': - strncpy(hostname, optarg, 999); - break; - case '?': - default: - printf("Args are:\n" - "\t-d\tDetach from terminal\n" - "\t-c \tConfig file\n" - "\t-h \tForce hostname\n" - "\t-a
\tUse specific address\n" - "\t-v\t\tDebug\n"); - - return (0); - break; + case 'd': + if (fork()) exit(0); + setsid(); + freopen("/dev/null", "r", stdin); + freopen("/dev/null", "w", stdout); + freopen("/dev/null", "w", stderr); + break; + case 'v': + optdebug++; + break; + case 'c': + optconfig = optarg; + break; + case 'h': + snprintf(hostname, sizeof(hostname), "%s", optarg); + break; + default: + printf("Args are:\n" + "\t-d\t\tDetach from terminal\n" + "\t-c \tConfig file\n" + "\t-h \tForce hostname\n" + "\t-v\t\tDebug\n"); + + return (0); + break; } } // Start the timer routine off time(&time_now); - strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now)); + strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); signal(SIGALRM, sigalrm_handler); siginterrupt(SIGALRM, 0); - initiptables(); initplugins(); - initdata(); - init_tbf(); - init_cli(); + initdata(optdebug, optconfig); + + init_cli(hostname); read_config_file(); + init_tbf(config->num_tbfs); - log(0, 0, 0, 0, "$Id: l2tpns.c,v 1.8 2004/06/23 03:52:24 fred_nerk Exp $\n" - "(c) Copyright 2003, 2004 Optus Internet Engineering\n" - "(c) Copyright 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); + LOG(0, 0, 0, "L2TPNS version " VERSION "\n"); + LOG(0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n"); + LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); { struct rlimit rlim; rlim.rlim_cur = RLIM_INFINITY; rlim.rlim_max = RLIM_INFINITY; // Remove the maximum core size if (setrlimit(RLIMIT_CORE, &rlim) < 0) - log(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno)); + // Make core dumps go to /tmp chdir("/tmp"); } @@ -2929,42 +3062,42 @@ int main(int argc, char *argv[]) if (get_nprocs() < 2) { - log(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n"); + LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n"); config->scheduler_fifo = 0; } else { if ((ret = sched_setscheduler(0, SCHED_FIFO, ¶ms)) == 0) { - log(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n"); + LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n"); } else { - log(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); config->scheduler_fifo = 0; } } } /* Set up the cluster communications port. */ - if (cluster_init(config->bind_address) < 0) + if (cluster_init() < 0) exit(1); #ifdef BGP signal(SIGPIPE, SIG_IGN); bgp_setup(config->as_number); bgp_add_route(config->bind_address, 0xffffffff); - if (*config->bgp_peer[0]) - bgp_start(&bgp_peers[0], config->bgp_peer[0], - config->bgp_peer_as[0], 0); /* 0 = routing disabled */ - - if (*config->bgp_peer[1]) - bgp_start(&bgp_peers[1], config->bgp_peer[1], - config->bgp_peer_as[1], 0); + for (i = 0; i < BGP_NUM_PEERS; i++) + { + if (config->neighbour[i].name[0]) + bgp_start(&bgp_peers[i], config->neighbour[i].name, + config->neighbour[i].as, config->neighbour[i].keepalive, + config->neighbour[i].hold, 0); /* 0 = routing disabled */ + } #endif /* BGP */ - inittap(); - log(1, 0, 0, 0, "Set up on interface %s\n", config->tapdevice); + inittun(); + LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice); initudp(); initrad(); @@ -2978,6 +3111,15 @@ int main(int argc, char *argv[]) signal(SIGQUIT, sigquit_handler); signal(SIGCHLD, sigchild_handler); + // Prevent us from getting paged out + if (config->lock_pages) + { + if (!mlockall(MCL_CURRENT)) + LOG(1, 0, 0, "Locking pages into memory\n"); + else + LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno)); + } + alarm(1); // Drop privileges here @@ -2989,24 +3131,25 @@ int main(int argc, char *argv[]) #ifdef BGP /* try to shut BGP down cleanly; with luck the sockets will be writable since we're out of the select */ - { - int i; - for (i = 0; i < BGP_NUM_PEERS; i++) - if (bgp_peers[i].state == Established) - bgp_stop(&bgp_peers[i]); - } + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established) + bgp_stop(&bgp_peers[i]); #endif /* BGP */ /* remove plugins (so cleanup code gets run) */ plugins_done(); + // Remove the PID file if we wrote it + if (config->wrote_pid && *config->pid_file == '/') + unlink(config->pid_file); + /* kill CLI children */ signal(SIGTERM, SIG_IGN); kill(0, SIGTERM); return 0; } -void sighup_handler(int junk) +static void sighup_handler(int sig) { if (log_stream && log_stream != stderr) { @@ -3017,7 +3160,7 @@ void sighup_handler(int junk) read_config_file(); } -void sigalrm_handler(int junk) +static void sigalrm_handler(int sig) { // Log current traffic stats @@ -3039,7 +3182,7 @@ void sigalrm_handler(int junk) // Update the internal time counter time(&time_now); - strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now)); + strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); alarm(1); { @@ -3050,20 +3193,20 @@ void sigalrm_handler(int junk) } -void sigterm_handler(int junk) +static void sigterm_handler(int sig) { - log(1, 0, 0, 0, "Shutting down cleanly\n"); + LOG(1, 0, 0, "Shutting down cleanly\n"); if (config->save_state) dump_state(); main_quit++; } -void sigquit_handler(int junk) +static void sigquit_handler(int sig) { int i; - log(1, 0, 0, 0, "Shutting down without saving sessions\n"); + LOG(1, 0, 0, "Shutting down without saving sessions\n"); for (i = 1; i < MAXSESSION; i++) { if (session[i].opened) @@ -3078,190 +3221,200 @@ void sigquit_handler(int junk) main_quit++; } -void sigchild_handler(int signal) +static void sigchild_handler(int sig) { while (waitpid(-1, NULL, WNOHANG) > 0) ; } -void read_state() +static void read_state() { - struct stat sb; - int i; - ippoolt itmp; - FILE *f; - char magic[sizeof(DUMP_MAGIC)-1]; - u32 buf[2]; + struct stat sb; + int i; + ippoolt itmp; + FILE *f; + char magic[sizeof(DUMP_MAGIC) - 1]; + u32 buf[2]; - if (!config->save_state) - { - unlink(STATEFILE); - return; - } + if (!config->save_state) + { + unlink(STATEFILE); + return ; + } - if (stat(STATEFILE, &sb) < 0) - { - unlink(STATEFILE); - return; - } + if (stat(STATEFILE, &sb) < 0) + { + unlink(STATEFILE); + return ; + } - if (sb.st_mtime < (time(NULL) - 60)) - { - log(0, 0, 0, 0, "State file is too old to read, ignoring\n"); - unlink(STATEFILE); - return; - } + if (sb.st_mtime < (time(NULL) - 60)) + { + LOG(0, 0, 0, "State file is too old to read, ignoring\n"); + unlink(STATEFILE); + return ; + } - f = fopen(STATEFILE, "r"); - unlink(STATEFILE); + f = fopen(STATEFILE, "r"); + unlink(STATEFILE); - if (!f) - { - log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno)); - exit(1); - } + if (!f) + { + LOG(0, 0, 0, "Can't read state file: %s\n", strerror(errno)); + exit(1); + } - if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic))) - { - log(0, 0, 0, 0, "Bad state file magic\n"); - exit(1); - } + if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic))) + { + LOG(0, 0, 0, "Bad state file magic\n"); + exit(1); + } - log(1, 0, 0, 0, "Reading state information\n"); - if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt)) - { - log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n"); - exit(1); - } + LOG(1, 0, 0, "Reading state information\n"); + if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt)) + { + LOG(0, 0, 0, "Error/mismatch reading ip pool header from state file\n"); + exit(1); + } - if (buf[0] > ip_pool_size) - { - log(0, 0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf[0], ip_pool_size); - exit(1); - } + if (buf[0] > ip_pool_size) + { + LOG(0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf[0], ip_pool_size); + exit(1); + } - log(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]); - for (i = 0; i < buf[0]; i++) - { - if (fread(&itmp, sizeof(itmp), 1, f) != 1) + LOG(2, 0, 0, "Loading %u ip addresses\n", buf[0]); + for (i = 0; i < buf[0]; i++) { - log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno)); - exit(1); + if (fread(&itmp, sizeof(itmp), 1, f) != 1) + { + LOG(0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno)); + exit(1); + } + + if (itmp.address != ip_address_pool[i].address) + { + LOG(0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i); + exit(1); + } + + memcpy(&ip_address_pool[i], &itmp, sizeof(itmp)); } - if (itmp.address != ip_address_pool[i].address) + if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt)) { - log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i); - exit(1); + LOG(0, 0, 0, "Error/mismatch reading tunnel header from state file\n"); + exit(1); } - memcpy(&ip_address_pool[i], &itmp, sizeof(itmp)); - } + LOG(2, 0, 0, "Loading %u tunnels\n", MAXTUNNEL); + if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) + { + LOG(0, 0, 0, "Error reading tunnel data from state file\n"); + exit(1); + } - if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt)) - { - log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n"); - exit(1); - } + for (i = 0; i < MAXTUNNEL; i++) + { + tunnel[i].controlc = 0; + tunnel[i].controls = NULL; + tunnel[i].controle = NULL; + if (*tunnel[i].hostname) + LOG(3, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname); + } - log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL); - if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) - { - log(0, 0, 0, 0, "Error reading tunnel data from state file\n"); - exit(1); - } - - for (i = 0; i < MAXTUNNEL; i++) - { - tunnel[i].controlc = 0; - tunnel[i].controls = NULL; - tunnel[i].controle = NULL; - if (*tunnel[i].hostname) - log(3, 0, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname); - } - - if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont)) - { - log(0, 0, 0, 0, "Error/mismatch reading session header from state file\n"); - exit(1); - } + if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont)) + { + LOG(0, 0, 0, "Error/mismatch reading session header from state file\n"); + exit(1); + } - log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION); - if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) - { - log(0, 0, 0, 0, "Error reading session data from state file\n"); - exit(1); - } + LOG(2, 0, 0, "Loading %u sessions\n", MAXSESSION); + if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) + { + LOG(0, 0, 0, "Error reading session data from state file\n"); + exit(1); + } - for (i = 0; i < MAXSESSION; i++) - { - session[i].tbf_in = 0; - session[i].tbf_out = 0; - if (session[i].opened) + for (i = 0; i < MAXSESSION; i++) { - log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user); - if (session[i].ip) - sessionsetup(session[i].tunnel, i); + session[i].tbf_in = 0; + session[i].tbf_out = 0; + if (session[i].opened) + { + LOG(2, i, 0, "Loaded active session for user %s\n", session[i].user); + if (session[i].ip) + sessionsetup(session[i].tunnel, i); + } } - } - fclose(f); - log(0, 0, 0, 0, "Loaded saved state information\n"); + fclose(f); + LOG(0, 0, 0, "Loaded saved state information\n"); } -void dump_state() +static void dump_state() { - FILE *f; - u32 buf[2]; + FILE *f; + u32 buf[2]; - if (!config->save_state) - return; + if (!config->save_state) + return; - do { - if (!(f = fopen(STATEFILE, "w"))) - break; + do + { + if (!(f = fopen(STATEFILE, "w"))) + break; - log(1, 0, 0, 0, "Dumping state information\n"); + LOG(1, 0, 0, "Dumping state information\n"); - if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC)-1, 1, f) != 1) break; + if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1) + break; - log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size); - buf[0] = ip_pool_size; - buf[1] = sizeof(ippoolt); - if (fwrite(buf, sizeof(buf), 1, f) != 1) break; - if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size) break; + LOG(2, 0, 0, "Dumping %u ip addresses\n", ip_pool_size); + buf[0] = ip_pool_size; + buf[1] = sizeof(ippoolt); + if (fwrite(buf, sizeof(buf), 1, f) != 1) + break; + if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size) + break; - log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL); - buf[0] = MAXTUNNEL; - buf[1] = sizeof(tunnelt); - if (fwrite(buf, sizeof(buf), 1, f) != 1) break; - if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) break; + LOG(2, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL); + buf[0] = MAXTUNNEL; + buf[1] = sizeof(tunnelt); + if (fwrite(buf, sizeof(buf), 1, f) != 1) + break; + if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) + break; - log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION); - buf[0] = MAXSESSION; - buf[1] = sizeof(sessiont); - if (fwrite(buf, sizeof(buf), 1, f) != 1) break; - if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) break; + LOG(2, 0, 0, "Dumping %u sessions\n", MAXSESSION); + buf[0] = MAXSESSION; + buf[1] = sizeof(sessiont); + if (fwrite(buf, sizeof(buf), 1, f) != 1) + break; + if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) + break; - if (fclose(f) == 0) return; // OK - } while (0); + if (fclose(f) == 0) + return ; // OK + } + while (0); - log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno)); - unlink(STATEFILE); + LOG(0, 0, 0, "Can't write state information: %s\n", strerror(errno)); + unlink(STATEFILE); } -void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response) +static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response) { MD5_CTX ctx; *challenge_response = NULL; if (!*config->l2tpsecret) { - log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); + LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); return; } - log(4, 0, 0, 0, " Building challenge response for CHAP request\n"); + LOG(4, 0, 0, " Building challenge response for CHAP request\n"); *challenge_response = (char *)calloc(17, 1); @@ -3276,18 +3429,20 @@ void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **ch static int facility_value(char *name) { - int i; - for (i = 0; facilitynames[i].c_name; i++) - { - if (strcmp(facilitynames[i].c_name, name) == 0) - return facilitynames[i].c_val; - } - return 0; + int i; + for (i = 0; facilitynames[i].c_name; i++) + { + if (strcmp(facilitynames[i].c_name, name) == 0) + return facilitynames[i].c_val; + } + return 0; } -void update_config() +static void update_config() { int i; + static int timeout = 0; + static int interval = 0; // Update logging closelog(); @@ -3332,12 +3487,24 @@ void update_config() // Update radius config->numradiusservers = 0; for (i = 0; i < MAXRADSERVER; i++) - if (config->radiusserver[i]) config->numradiusservers++; + if (config->radiusserver[i]) + { + config->numradiusservers++; + // Set radius port: if not set, take the port from the + // first radius server. For the first radius server, + // take the #defined default value from l2tpns.h + + // test twice, In case someone works with + // a secondary radius server without defining + // a primary one, this will work even then. + if (i>0 && !config->radiusport[i]) + config->radiusport[i] = config->radiusport[i-1]; + if (!config->radiusport[i]) + config->radiusport[i] = RADPORT; + } if (!config->numradiusservers) - { - log(0, 0, 0, 0, "No RADIUS servers defined!\n"); - } + LOG(0, 0, 0, "No RADIUS servers defined!\n"); config->num_radfds = 2 << RADIUS_SHIFT; @@ -3346,6 +3513,7 @@ void update_config() { if (strcmp(config->plugins[i], config->old_plugins[i]) == 0) continue; + if (*config->plugins[i]) { // Plugin added @@ -3359,27 +3527,70 @@ void update_config() } memcpy(config->old_plugins, config->plugins, sizeof(config->plugins)); if (!config->cleanup_interval) config->cleanup_interval = 10; - if (!config->multi_read_count) config->multi_read_count = 1; + if (!config->multi_read_count) config->multi_read_count = 10; if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR); if (!*config->cluster_interface) strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1); - config->reload_config = 0; -} + if (!config->cluster_hb_interval) + config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds. -void read_config_file() -{ - FILE *f; + if (!config->cluster_hb_timeout) + config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election. - if (!config->config_file) return; - if (!(f = fopen(config->config_file, "r"))) { - fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno)); + if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout) + { + // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as + // late, ensure we're sufficiently larger than that + int t = 4 * config->cluster_hb_interval + 11; + + if (config->cluster_hb_timeout < t) + { + LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t); + config->cluster_hb_timeout = t; + } + + // Push timing changes to the slaves immediately if we're the master + if (config->cluster_iam_master) + cluster_heartbeat(); + + interval = config->cluster_hb_interval; + timeout = config->cluster_hb_timeout; + } + + // Write PID file + if (*config->pid_file == '/' && !config->wrote_pid) + { + FILE *f; + if ((f = fopen(config->pid_file, "w"))) + { + fprintf(f, "%d\n", getpid()); + fclose(f); + config->wrote_pid = 1; + } + else + { + LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); + } + } + + config->reload_config = 0; +} + +static void read_config_file() +{ + FILE *f; + + if (!config->config_file) return; + if (!(f = fopen(config->config_file, "r"))) + { + fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno)); return; } - log(3, 0, 0, 0, "Reading config file %s\n", config->config_file); + LOG(3, 0, 0, "Reading config file %s\n", config->config_file); cli_do_file(f); - log(3, 0, 0, 0, "Done reading config file\n"); + LOG(3, 0, 0, "Done reading config file\n"); fclose(f); update_config(); } @@ -3391,20 +3602,22 @@ int sessionsetup(tunnelidt t, sessionidt s) char *user; sessionidt i; int r; -#ifdef STAT_CALLS - STAT(call_sessionsetup); -#endif - log(3, session[s].ip, s, t, "Doing session setup for session\n"); + CSTAT(call_sessionsetup); + + LOG(3, s, t, "Doing session setup for session\n"); if (!session[s].ip || session[s].ip == 0xFFFFFFFE) { assign_ip_address(s); - if (session[s].ip) - log(3, 0, s, t, " No IP allocated. Assigned %s from pool\n", - inet_toa(htonl(session[s].ip))); - else - log(0, 0, s, t, " No IP allocated. The IP address pool is FULL!\n"); + if (!session[s].ip) + { + LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n"); + sessionshutdown(s, "No IP addresses available"); + return 0; + } + LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", + fmtaddr(htonl(session[s].ip), 0)); } @@ -3426,23 +3639,37 @@ int sessionsetup(tunnelidt t, sessionidt s) } } + { + int routed = 0; + // Add the route for this session. - // - // Static IPs need to be routed. Anything else - // is part of the IP address pool and is already routed, - // it just needs to be added to the IP cache. - if (session[s].ip_pool_index == -1) // static ip - routeset(s, session[s].ip, 0, 0, 1); - else - cache_ipmap(session[s].ip, s); + for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) + { + if ((session[s].ip & session[s].route[r].mask) == + (session[s].route[r].ip & session[s].route[r].mask)) + routed++; - for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) - routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1); + routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1); + } + + // Static IPs need to be routed if not already + // convered by a Framed-Route. Anything else is part + // of the IP address pool and is already routed, it + // just needs to be added to the IP cache. + if (session[s].ip_pool_index == -1) // static ip + { + if (!routed) routeset(s, session[s].ip, 0, 0, 1); + } + else + cache_ipmap(session[s].ip, s); + } - if (!session[s].sid) { // did this session just finish radius? - log(3, session[s].ip, s, t, "Sending initial IPCP to client\n"); + if (!session[s].unique_id) + { + // did this session just finish radius? + LOG(3, s, t, "Sending initial IPCP to client\n"); sendipcp(t, s); - session[s].sid = ++last_sid; + session[s].unique_id = ++last_id; } // Run the plugin's against this new session. @@ -3451,22 +3678,15 @@ int sessionsetup(tunnelidt t, sessionidt s) run_plugins(PLUGIN_NEW_SESSION, &data); } - // Force throttling on or off (Actually : refresh the current throttling status) - // This has the advantage of cleaning up after another throttled user who may have left - // firewall rules lying around - throttle_session(s, session[s].throttle); + // Allocate TBFs if throttled + if (session[s].throttle_in || session[s].throttle_out) + throttle_session(s, session[s].throttle_in, session[s].throttle_out); session[s].last_packet = time_now; - { - char *sessionip, *tunnelip; - sessionip = strdup(inet_toa(htonl(session[s].ip))); - tunnelip = strdup(inet_toa(htonl(tunnel[t].ip))); - log(2, session[s].ip, s, t, "Login by %s at %s from %s (%s)\n", - session[s].user, sessionip, tunnelip, tunnel[t].hostname); - if (sessionip) free(sessionip); - if (tunnelip) free(tunnelip); - } + LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user, + fmtaddr(htonl(session[s].ip), 0), + fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname); cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster. @@ -3480,11 +3700,13 @@ int sessionsetup(tunnelidt t, sessionidt s) int load_session(sessionidt s, sessiont *new) { int i; + int newip = 0; // Sanity checks. if (new->ip_pool_index >= MAXIPPOOL || - new->tunnel >= MAXTUNNEL) { - log(0,0,s,0, "Strange session update received!\n"); + new->tunnel >= MAXTUNNEL) + { + LOG(0, s, 0, "Strange session update received!\n"); // FIXME! What to do here? return 0; } @@ -3496,69 +3718,111 @@ int load_session(sessionidt s, sessiont *new) session[s].tunnel = new->tunnel; // For logging in cache_ipmap + // See if routes/ip cache need updating + if (new->ip != session[s].ip) + newip++; + + for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++) + if (new->route[i].ip != session[s].route[i].ip || + new->route[i].mask != session[s].route[i].mask) + newip++; - if (new->ip != session[s].ip) // Changed ip. fix up hash tables. + // needs update + if (newip) { - if (session[s].ip) // If there's an old one, remove it. + int routed = 0; + + // remove old routes... + for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++) + { + if ((session[s].ip & session[s].route[i].mask) == + (session[s].route[i].ip & session[s].route[i].mask)) + routed++; + + routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0); + } + + // ...ip + if (session[s].ip) { if (session[s].ip_pool_index == -1) // static IP - routeset(s, session[s].ip, 0, 0, 0); - else // It's part of the IP pool, add it manually. + { + if (!routed) routeset(s, session[s].ip, 0, 0, 0); + } + else // It's part of the IP pool, remove it manually. uncache_ipmap(session[s].ip); } - if (new->ip) { // If there's a new one, add it. + routed = 0; + + // add new routes... + for (i = 0; i < MAXROUTE && new->route[i].ip; i++) + { + if ((new->ip & new->route[i].mask) == + (new->route[i].ip & new->route[i].mask)) + routed++; + + routeset(s, new->route[i].ip, new->route[i].mask, 0, 1); + } + + // ...ip + if (new->ip) + { + // If there's a new one, add it. if (new->ip_pool_index == -1) - routeset(s, new->ip, 0, 0, 1); + { + if (!routed) routeset(s, new->ip, 0, 0, 1); + } else cache_ipmap(new->ip, s); } } - // Add routes for the session if they're new. - for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++) + // check filters + if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0])) { - if (new->route[i].ip == session[s].route[i].ip && - new->route[i].mask == session[s].route[i].mask) - continue; - - if (session[s].route[i].ip) // Remove the old one if it exists. - routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].route[i].ip, 0); + LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in); + new->filter_in = 0; + } - if (new->route[i].ip) // Add the new one if it exists. - routeset(s, new->route[i].ip, new->route[i].mask, new->ip, 1); + if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0])) + { + LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out); + new->filter_out = 0; } + if (new->filter_in != session[s].filter_in) + { + if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--; + if (new->filter_in) ip_filters[new->filter_in - 1].used++; + } + if (new->filter_out != session[s].filter_out) + { + if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--; + if (new->filter_out) ip_filters[new->filter_out - 1].used++; + } if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used // for walking the sessions to forward byte counts to the master. config->cluster_highest_sessionid = s; + // TEMP: old session struct used a u32 to define the throttle + // speed for both up/down, new uses a u16 for each. Deal with + // sessions from an old master for migration. + if (new->throttle_out == 0 && new->tbf_out) + new->throttle_out = new->throttle_in; + memcpy(&session[s], new, sizeof(session[s])); // Copy over.. // Do fixups into address pool. if (new->ip_pool_index != -1) fix_address_pool(s); - return 1; -} - -#ifdef RINGBUFFER -void ringbuffer_dump(FILE *stream) -{ - int i = ringbuffer->head; - while (i != ringbuffer->tail) - { - if (*ringbuffer->buffer[i].message) - fprintf(stream, "%d-%s", ringbuffer->buffer[i].level, ringbuffer->buffer[i].message); - if (++i == ringbuffer->tail) break; - if (i == RINGBUFFER_SIZE) i = 0; - } + return 1; } -#endif -void initplugins() +static void initplugins() { int i; @@ -3573,22 +3837,48 @@ static void *open_plugin(char *plugin_name, int load) char path[256] = ""; snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name); - log(2, 0, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path); + LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path); return dlopen(path, RTLD_NOW); } -void add_plugin(char *plugin_name) +// plugin callback to get a config value +static void *getconfig(char *key, enum config_typet type) +{ + int i; + + for (i = 0; config_values[i].key; i++) + { + if (!strcmp(config_values[i].key, key)) + { + if (config_values[i].type == type) + return ((void *) config) + config_values[i].offset; + + LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n", + key, type, config_values[i].type); + + return 0; + } + } + + LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key); + return 0; +} + +static int add_plugin(char *plugin_name) { static struct pluginfuncs funcs = { _log, _log_hex, - inet_toa, + fmtaddr, sessionbyuser, sessiontbysessionidt, sessionidtbysessiont, - sessionkill, radiusnew, radiussend, + getconfig, + sessionkill, + throttle_session, + cluster_send_session, }; void *p = open_plugin(plugin_name, 1); @@ -3597,23 +3887,23 @@ void add_plugin(char *plugin_name) if (!p) { - log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror()); - return; + LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror()); + return -1; } if (ll_contains(loaded_plugins, p)) { dlclose(p); - return; + return 0; // already loaded } { - int *v = dlsym(p, "__plugin_api_version"); + int *v = dlsym(p, "plugin_api_version"); if (!v || *v != PLUGIN_API_VERSION) { - log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); + LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); dlclose(p); - return; + return -1; } } @@ -3621,9 +3911,9 @@ void add_plugin(char *plugin_name) { if (!initfunc(&funcs)) { - log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); + LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); dlclose(p); - return; + return -1; } } @@ -3634,12 +3924,13 @@ void add_plugin(char *plugin_name) void *x; if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) { - log(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); + LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); ll_push(plugins[i], x); } } - log(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name); + LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name); + return 1; } static void run_plugin_done(void *plugin) @@ -3650,48 +3941,54 @@ static void run_plugin_done(void *plugin) donefunc(); } -void remove_plugin(char *plugin_name) +static int remove_plugin(char *plugin_name) { void *p = open_plugin(plugin_name, 0); - int i; + int loaded = 0; if (!p) - return; - - for (i = 0; i < max_plugin_functions; i++) - { - void *x; - if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) - ll_delete(plugins[i], x); - } + return -1; if (ll_contains(loaded_plugins, p)) { + int i; + for (i = 0; i < max_plugin_functions; i++) + { + void *x; + if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) + ll_delete(plugins[i], x); + } + ll_delete(loaded_plugins, p); run_plugin_done(p); + loaded = 1; } dlclose(p); - log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name); + LOG(2, 0, 0, "Removed plugin %s\n", plugin_name); + return loaded; } int run_plugins(int plugin_type, void *data) { int (*func)(void *data); - if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1; + + if (!plugins[plugin_type] || plugin_type > max_plugin_functions) + return PLUGIN_RET_ERROR; ll_reset(plugins[plugin_type]); while ((func = ll_next(plugins[plugin_type]))) { - int rc; - rc = func(data); - if (rc == PLUGIN_RET_STOP) return 1; - if (rc == PLUGIN_RET_ERROR) return 0; + int r = func(data); + + if (r != PLUGIN_RET_OK) + return r; // stop here } - return 1; + + return PLUGIN_RET_OK; } -void plugins_done() +static void plugins_done() { void *p; @@ -3700,80 +3997,192 @@ void plugins_done() run_plugin_done(p); } -void processcontrol(u8 * buf, int len, struct sockaddr_in *addr) +static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen) { - char *resp; - int l; - struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 }; + struct nsctl request; + struct nsctl response; + int type = unpack_control(&request, buf, len); + int r; + void *p; - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received "); - if (log_stream) - dump_packet(buf, log_stream); + if (log_stream && config->debug >= 4) + { + if (type < 0) + { + LOG(4, 0, 0, "Bogus control message from %s (%d)\n", + fmtaddr(addr->sin_addr.s_addr, 0), type); + } + else + { + LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0)); + dump_control(&request, log_stream); + } + } + + switch (type) + { + case NSCTL_REQ_LOAD: + if (request.argc != 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "name of plugin required"; + } + else if ((r = add_plugin(request.argv[0])) < 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = !r + ? "plugin already loaded" + : "error loading plugin"; + } + else + { + response.type = NSCTL_RES_OK; + response.argc = 0; + } + + break; + + case NSCTL_REQ_UNLOAD: + if (request.argc != 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "name of plugin required"; + } + else if ((r = remove_plugin(request.argv[0])) < 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = !r + ? "plugin not loaded" + : "plugin not found"; + } + else + { + response.type = NSCTL_RES_OK; + response.argc = 0; + } - resp = calloc(1400, 1); - l = new_packet(PKT_RESP_ERROR, resp); - *(int *)(resp + 6) = *(int *)(buf + 6); + break; - param.type = ntohs(*(short *)(buf + 2)); - param.id = ntohl(*(int *)(buf + 6)); - param.data_length = ntohs(*(short *)(buf + 4)) - 10; - param.data = (param.data_length > 0) ? (char *)(buf + 10) : NULL; - param.response = resp; - param.response_length = l; + case NSCTL_REQ_HELP: + response.type = NSCTL_RES_OK; + response.argc = 0; - run_plugins(PLUGIN_CONTROL, ¶m); + ll_reset(loaded_plugins); + while ((p = ll_next(loaded_plugins))) + { + char **help = dlsym(p, "plugin_control_help"); + while (response.argc < 0xff && help && *help) + response.argv[response.argc++] = *help++; + } - if (param.send_response) - { - send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length); - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n"); - } + break; - free(resp); -} + case NSCTL_REQ_CONTROL: + { + struct param_control param = { + config->cluster_iam_master, + request.argc, + request.argv, + 0, + NULL, + }; -/* - * HACK - * Go through all of the tunnels and do some cleanups - */ -void tunnel_clean() -{ - int i; + int r = run_plugins(PLUGIN_CONTROL, ¶m); + + if (r == PLUGIN_RET_ERROR) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = param.additional + ? param.additional + : "error returned by plugin"; + } + else if (r == PLUGIN_RET_NOTMASTER) + { + static char msg[] = "must be run on master: 000.000.000.000"; + + response.type = NSCTL_RES_ERR; + response.argc = 1; + if (config->cluster_master_address) + { + strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0)); + response.argv[0] = msg; + } + else + { + response.argv[0] = "must be run on master: none elected"; + } + } + else if (!(param.response & NSCTL_RESPONSE)) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = param.response + ? "unrecognised response value from plugin" + : "unhandled action"; + } + else + { + response.type = param.response; + response.argc = 0; + if (param.additional) + { + response.argc = 1; + response.argv[0] = param.additional; + } + } + } - log(1, 0, 0, 0, "Cleaning tunnels array\n"); + break; - for (i = 1; i < MAXTUNNEL; i++) + default: + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "error unpacking control packet"; + } + + buf = calloc(NSCTL_MAX_PKT_SZ, 1); + if (!buf) + { + LOG(2, 0, 0, "Failed to allocate nsctl response\n"); + return; + } + + r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv); + if (r > 0) { - if (!tunnel[i].ip - || !*tunnel[i].hostname - || (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now)) + sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen); + if (log_stream && config->debug >= 4) { - tunnelclear(i); + LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0)); + dump_control(&response, log_stream); } } -} + else + LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n", + fmtaddr(addr->sin_addr.s_addr, 0), r); -void tunnelclear(tunnelidt t) -{ - if (!t) return; - memset(&tunnel[t], 0, sizeof(tunnel[t])); - tunnel[t].state = TUNNELFREE; + free(buf); } -tunnelidt new_tunnel() +static tunnelidt new_tunnel() { tunnelidt i; for (i = 1; i < MAXTUNNEL; i++) { if (tunnel[i].state == TUNNELFREE) { - log(4, 0, 0, i, "Assigning tunnel ID %d\n", i); + LOG(4, 0, i, "Assigning tunnel ID %d\n", i); if (i > config->cluster_highest_tunnelid) config->cluster_highest_tunnelid = i; return i; } } - log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); + LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); return 0; } @@ -3786,18 +4195,32 @@ tunnelidt new_tunnel() // void become_master(void) { - int s; + int s, i; run_plugins(PLUGIN_BECOME_MASTER, NULL); - for (s = 0; s < config->cluster_highest_sessionid ; ++s) { - if (!session[s].tunnel) // Not an in-use session. - continue; + // running a bunch of iptables commands is slow and can cause + // the master to drop tunnels on takeover--kludge around the + // problem by forking for the moment (note: race) + if (!fork_and_close()) + { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { + if (!session[s].tunnel) // Not an in-use session. + continue; - run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + } + exit(0); } -} - + // add radius fds + for (i = 0; i < config->num_radfds; i++) + { + FD_SET(radfds[i], &readset); + if (radfds[i] > readset_n) + readset_n = radfds[i]; + } +} int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc) { @@ -3805,10 +4228,14 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc int count = 0; int buckets[64]; + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; + time(&time_now); for (i = 0; i < 64;++i) buckets[i] = 0; - for (s = 0; s < config->cluster_highest_sessionid ; ++s) { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { int idle; if (!session[s].tunnel) continue; @@ -3824,7 +4251,8 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc ++buckets[idle]; } - for (i = 0; i < 63; ++i) { + for (i = 0; i < 63; ++i) + { cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]); } cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]); @@ -3838,10 +4266,14 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc int count = 0; int buckets[64]; + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; + time(&time_now); for (i = 0; i < 64;++i) buckets[i] = 0; - for (s = 0; s < config->cluster_highest_sessionid ; ++s) { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { int open = 0, d; if (!session[s].tunnel) continue; @@ -3849,7 +4281,8 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc d = time_now - session[s].opened; if (d < 0) d = 0; - while (d > 1 && open < 32) { + while (d > 1 && open < 32) + { ++open; d >>= 1; // half. } @@ -3858,10 +4291,200 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc } s = 1; - for (i = 0; i < 30; ++i) { + for (i = 0; i < 30; ++i) + { cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]); s <<= 1; } cli_print(cli, "%d total sessions open.", count); return CLI_OK; } + +/* Unhide an avp. + * + * This unencodes the AVP using the L2TP CHAP secret and the + * previously stored random vector. It replaces the hidden data with + * the cleartext data and returns the length of the cleartext data + * (including the AVP "header" of 6 bytes). + * + * Based on code from rp-l2tpd by Roaring Penguin Software Inc. + */ +static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length) +{ + MD5_CTX ctx; + u8 *cursor; + u8 digest[16]; + u8 working_vector[16]; + uint16_t hidden_length; + u8 type[2]; + size_t done, todo; + u8 *output; + + // Find the AVP type. + type[0] = *(avp + 4); + type[1] = *(avp + 5); + + // Line up with the hidden data + cursor = output = avp + 6; + + // Compute initial pad + MD5Init(&ctx); + MD5Update(&ctx, type, 2); + MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length); + MD5Final(digest, &ctx); + + // Get hidden length + hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]); + + // Keep these for later use + working_vector[0] = *cursor; + working_vector[1] = *(cursor + 1); + cursor += 2; + + if (hidden_length > length - 8) + { + LOG(1, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length); + return 0; + } + + /* Decrypt remainder */ + done = 2; + todo = hidden_length; + while (todo) + { + working_vector[done] = *cursor; + *output = digest[done] ^ *cursor; + ++output; + ++cursor; + --todo; + ++done; + if (done == 16 && todo) + { + // Compute new digest + done = 0; + MD5Init(&ctx); + MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5Update(&ctx, &working_vector, 16); + MD5Final(digest, &ctx); + } + } + + return hidden_length + 6; +} + +static int ip_filter_port(ip_filter_portt *p, portt port) +{ + switch (p->op) + { + case FILTER_PORT_OP_EQ: return port == p->port; + case FILTER_PORT_OP_NEQ: return port != p->port; + case FILTER_PORT_OP_GT: return port > p->port; + case FILTER_PORT_OP_LT: return port < p->port; + case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2; + } + + return 0; +} + +static int ip_filter_flag(u8 op, u8 sflags, u8 cflags, u8 flags) +{ + switch (op) + { + case FILTER_FLAG_OP_ANY: + return (flags & sflags) || (~flags & cflags); + + case FILTER_FLAG_OP_ALL: + return (flags & sflags) == sflags && (~flags & cflags) == cflags; + + case FILTER_FLAG_OP_EST: + return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN); + } + + return 0; +} + +int ip_filter(u8 *buf, int len, u8 filter) +{ + u16 frag_offset; + u8 proto; + ipt src_ip; + ipt dst_ip; + portt src_port = 0; + portt dst_port = 0; + u8 flags = 0; + ip_filter_rulet *rule; + + if (len < 20) // up to end of destination address + return 0; + + if ((*buf >> 4) != 4) // IPv4 + return 0; + + frag_offset = ntohs(*(u16 *) (buf + 6)) & 0x1fff; + proto = buf[9]; + src_ip = *(u32 *) (buf + 12); + dst_ip = *(u32 *) (buf + 16); + + if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP)) + { + int l = (buf[0] & 0xf) * 4; // length of IP header + if (len < l + 4) // ports + return 0; + + src_port = ntohs(*(u16 *) (buf + l)); + dst_port = ntohs(*(u16 *) (buf + l + 2)); + if (proto == IPPROTO_TCP) + { + if (len < l + 14) // flags + return 0; + + flags = buf[l + 13] & 0x3f; + } + } + + for (rule = ip_filters[filter].rules; rule->action; rule++) + { + if (rule->proto != IPPROTO_IP && proto != rule->proto) + continue; + + if (rule->src_wild != INADDR_BROADCAST && + (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild)) + continue; + + if (rule->dst_wild != INADDR_BROADCAST && + (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild)) + continue; + + if (frag_offset) + { + if (!rule->frag || rule->action == FILTER_ACTION_DENY) + continue; + } + else + { + if (rule->frag) + continue; + + if (proto == IPPROTO_TCP || proto == IPPROTO_UDP) + { + if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port)) + continue; + + if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port)) + continue; + + if (proto == IPPROTO_TCP && rule->tcp_flag_op && + !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags)) + continue; + } + } + + // matched + rule->counter++; + return rule->action == FILTER_ACTION_PERMIT; + } + + // default deny + return 0; +}