X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/3aa4eda8b1e0c4abc04439affe850d33648c7472..90f31e7f7188cd1a6ce58c4cc7d31bf7005a239c:/l2tpns.c diff --git a/l2tpns.c b/l2tpns.c index ea21dda..c0e7b7a 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -1,20 +1,24 @@ // 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 1.39 2004/11/03 13:23:58 bodea Exp $"; + #include #include #include #include #include +#define SYSLOG_NAMES +#include #include #include #include #include #include #include -#include #include #include #include @@ -24,15 +28,16 @@ #include #include #include -#include #include #include +#include #include #include #include -#ifdef HAVE_LIBCLI +#include +#include #include -#endif + #include "md5.h" #include "l2tpns.h" #include "cluster.h" @@ -41,63 +46,91 @@ #include "constants.h" #include "control.h" #include "util.h" - -ipt radiusserver[MAXRADSERVER]; // radius servers -u8 numradiusservers = 0; // how many radius servers +#include "tbf.h" // Globals -char tapdevice[10] = ""; // tap device name -int tapfd = -1; // tap interface file handle -int udpfd = -1; // UDP file handle -int controlfd = -1; // Control signal handle -int snoopfd = -1; // UDP file handle for sending out intercept data -int radfd = -1; // RADIUS requests file handle -int ifrfd = -1; // File descriptor for routing, etc -char debug = 0; // debug leveL -time_t basetime = 0; // base clock -char hostname[1000] = ""; // us. -ipt myip = 0; // MY IP -u16 tapmac[3]; // MAC of tap interface -int tapidx; // ifr_ifindex of tap device -char *radiussecret = 0; // RADIUS secret -char *l2tpsecret = 0; // L2TP secret -u32 sessionid = 0; // session id for radius accounting -char *snoop_destination_host = NULL; -u16 snoop_destination_port = 0; -char *log_filename = NULL; -char *config_file = CONFIGFILE; -FILE *log_stream = NULL; -unsigned long default_dns1 = 0, default_dns2 = 0; -struct sockaddr_in snoop_addr = {0}; -extern unsigned long rl_rate; -extern int cluster_sockfd; -unsigned long last_sid = 0; -int config_save_state = 0; -int radius_accounting = 0; -char *accounting_dir = NULL; -uint32_t cluster_address = 0; -uint32_t bind_address = INADDR_ANY; -int handle_interface = 0; -#ifdef HAVE_LIBCLI -pid_t cli_pid = 0; -int clifd = 0; -sessionidt *cli_session_kill = NULL; -tunnelidt *cli_tunnel_kill = NULL; -#endif -static void *ip_hash[256]; -unsigned long udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; -unsigned long eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0; -unsigned int ip_pool_index = 0; -unsigned int ip_pool_size = 0; -time_t time_now; -char time_now_string[64] = {0}; -char main_quit = 0; -int dump_speed = 0; -int target_uid = 500; +struct 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 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. +int tunidx; // ifr_ifindex of tun device +u32 sessionid = 0; // session id for radius accounting +int syslog_log = 0; // are we logging to syslog +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 +int clifd = 0; // Socket listening for CLI connections. + +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. + +u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; // Global traffic counters. +u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0; +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. +char time_now_string[64] = {0}; // Current time as a string. +char main_quit = 0; // True if we're in the process of exiting. char *_program_name = NULL; 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 } + +struct 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("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), + CONFIG("cluster_hb_interval", cluster_hb_interval, INT), + CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT), +#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 */ + { NULL, 0, 0, 0 }, +}; + char *plugin_functions[] = { NULL, "plugin_pre_auth", @@ -105,39 +138,44 @@ char *plugin_functions[] = { "plugin_packet_rx", "plugin_packet_tx", "plugin_timer", - "plugin_config", "plugin_new_session", "plugin_kill_session", "plugin_control", "plugin_radius_response", + "plugin_become_master", + "plugin_new_session_master", }; + #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *)) -tunnelt *tunnel = NULL; // 1000 * 45 = 45000 = 45k -sessiont *session = NULL; // 5000 * 213 = 1065000 = 1 Mb -radiust *radius = NULL; -ippoolt *ip_address_pool = NULL; -tunnelidt tunnelfree; // free list link heads -sessionidt sessionfree = 0; -u8 radiusfree; +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. controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER struct Tringbuffer *ringbuffer = NULL; #endif -tbft *filter_buckets = NULL; void sigalrm_handler(int); void sighup_handler(int); void sigterm_handler(int); void sigquit_handler(int); void sigchild_handler(int); -void sigsegv_handler(int); void read_config_file(); void read_state(); void dump_state(); +void tunnel_clean(); +tunnelidt new_tunnel(); +void update_config(); +int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length); -// return internal time (10ths since run) +static void cache_ipmap(ipt ip, int s); +static void uncache_ipmap(ipt ip); + +// return internal time (10ths since process startup) clockt now(void) { struct timeval t; @@ -146,14 +184,22 @@ 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); } + +// +// Log a debug message. +// void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) { + static char message[65536] = {0}; + static char message2[65536] = {0}; va_list ap; #ifdef RINGBUFFER @@ -175,142 +221,197 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, } #endif - if (debug < level) return; + if (config->debug < level) return; - if (!log_stream && log_filename) + va_start(ap, format); + if (log_stream) { - if ((log_stream = fopen(log_filename, "a"))) - fseek(log_stream, 0, SEEK_END); - setbuf(log_stream, NULL); + vsnprintf(message2, 65535, format, ap); + snprintf(message, 65535, "%s %02d/%02d %s", time_now_string, t, s, message2); + fprintf(log_stream, "%s", message); } - if (!log_stream) + else if (syslog_log) { - log_stream = stderr; - setbuf(log_stream, NULL); + vsnprintf(message2, 65535, format, ap); + snprintf(message, 65535, "%02d/%02d %s", t, s, message2); + syslog(level + 2, message); // We don't need LOG_EMERG or LOG_ALERT } - - va_start(ap, format); - fprintf(log_stream, "%s %02d/%02d ", time_now_string, t, s); - vfprintf(log_stream, format, ap); 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) { - unsigned int i, j; - unsigned const char *d = (unsigned const char *)data; + int i, j; + const u8 *d = (const u8 *)data; - if (debug < level) return; - log(level, address, s, t, "%s (%d bytes):\n", title, maxsize); - setvbuf(log_stream, NULL, _IOFBF, 16384); - for (i = 0; i < maxsize; ) + if (config->debug < level) return; + + // No support for log_hex to syslog + if (log_stream) { - fprintf(log_stream, "%4X: ", i); - for (j = i; j < maxsize && j < (i + 16); j++) - { - fprintf(log_stream, "%02X ", d[j]); - if (j == i + 7) - fputs(": ", log_stream); - } + _log(level, 0, 0, 0, "%s (%d bytes):\n", title, maxsize); + setvbuf(log_stream, NULL, _IOFBF, 16384); - for (; j < i + 16; j++) + for (i = 0; i < maxsize; ) { - fputs(" ", log_stream); - if (j == i + 7) - fputs(": ", log_stream); - } + fprintf(log_stream, "%4X: ", i); + for (j = i; j < maxsize && j < (i + 16); j++) + { + fprintf(log_stream, "%02X ", d[j]); + if (j == i + 7) + fputs(": ", log_stream); + } - fputs(" ", log_stream); - for (j = i; j < maxsize && j < (i + 16); j++) - { - if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20) - fputc(d[j], log_stream); - else - fputc('.', log_stream); + for (; j < i + 16; j++) + { + fputs(" ", log_stream); + if (j == i + 7) + fputs(": ", log_stream); + } + + fputs(" ", log_stream); + for (j = i; j < maxsize && j < (i + 16); j++) + { + if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20) + fputc(d[j], log_stream); + else + fputc('.', log_stream); + + if (j == i + 7) + fputs(" ", log_stream); + } - if (j == i + 7) - fputs(" ", log_stream); + i = j; + fputs("\n", log_stream); } - i = j; - fputs("\n", log_stream); + fflush(log_stream); + setbuf(log_stream, NULL); } - fflush(log_stream); - setbuf(log_stream, NULL); } // Add a route -void routeset(ipt ip, ipt mask, ipt gw, u8 add) +// +// This adds it to the routing table, advertises it +// via iBGP 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) { struct rtentry r; + int i; + + if (!mask) mask = 0xffffffff; + + ip &= mask; // Force the ip to be the first one in the route. + memset(&r, 0, sizeof(r)); - r.rt_dev = 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; *(u32 *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw); r.rt_genmask.sa_family = AF_INET; - *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask ? : 0xFFFFFFF); + *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask); r.rt_flags = (RTF_UP | RTF_STATIC); if (gw) r.rt_flags |= RTF_GATEWAY; - else + else if (mask == 0xffffffff) r.rt_flags |= RTF_HOST; - if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) perror("routeset"); - 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 & 255, ip >> 8 & 255, ip & 255, mask >> 24, mask >> 16 & 255, mask >> 8 & 255, mask & 255, gw >> 24, gw >> 16 & 255, gw >> 8 & 255, gw & 255); + + 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); + + if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) + log(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); + +#ifdef BGP + if (add) + bgp_add_route(htonl(ip), htonl(mask)); + else + bgp_del_route(htonl(ip), htonl(mask)); +#endif /* BGP */ + + // Add/Remove the IPs to the 'sessionbyip' cache. + // 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. + // We still cache it here, because it will pre-fill + // the malloc'ed tree. + + if (s) + { + if (!add) // Are we deleting a route? + s = 0; // Caching the session as '0' is the same as uncaching. + + for (i = ip; (i&mask) == (ip&mask) ; ++i) + cache_ipmap(i, s); + } } -// Set up TAP interface -void inittap(void) +// +// Set up TUN interface +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)); - exit(-1); + log(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno)); + exit(1); + } + { + 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)); - exit(-1); + log(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno)); + exit(1); } - assert(strlen(ifr.ifr_name) < sizeof(tapdevice)); - strcpy(tapdevice, ifr.ifr_name); + 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; - sin.sin_addr.s_addr = handle_interface ? bind_address : 0x01010101; // 1.1.1.1 + sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1 memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr)); if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0) { - perror("set tap addr"); - exit( -1); + log(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno)); + exit(1); } - ifr.ifr_flags = IFF_UP; - if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0) + /* Bump up the qlen to deal with bursts from the network */ + ifr.ifr_qlen = 1000; + if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0) { - perror("set tap flags"); - exit( -1); + log(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); + exit(1); } - if (ioctl(ifrfd, SIOCGIFHWADDR, (void *) &ifr) < 0) + ifr.ifr_flags = IFF_UP; + if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0) { - perror("get tap hwaddr"); - exit( -1); + log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); + exit(1); } - memcpy(&tapmac, 2 + (u8 *) & ifr.ifr_hwaddr, 6); if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0) { - perror("get tap ifindex"); - exit( -1); + log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno)); + exit(1); } - tapidx = ifr.ifr_ifindex; + tunidx = ifr.ifr_ifindex; } // set up UDP port @@ -323,15 +424,19 @@ void initudp(void) memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(L2TPPORT); - addr.sin_addr.s_addr = bind_address; - udpfd = socket(AF_INET, SOCK_DGRAM, UDP); + addr.sin_addr.s_addr = config->bind_address; + udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); + { + int flags = fcntl(udpfd, F_GETFL, 0); + fcntl(udpfd, F_SETFL, flags | O_NONBLOCK); + } if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0) { - perror("bind"); - exit( -1); + log(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); + exit(1); } - snoopfd = socket(AF_INET, SOCK_DGRAM, UDP); + snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); // Control memset(&addr, 0, sizeof(addr)); @@ -341,31 +446,60 @@ void initudp(void) setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0) { - perror("bind"); - exit(-1); + log(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno)); + exit(1); } } -// Find session by IP, 0 for not found -sessionidt sessionbyip(ipt ip) +// +// Find session by IP, < 1 for not found +// +// Confusingly enough, this 'ip' must be +// in _network_ order. This being the common +// case when looking it up from IP packet headers. +// +// We actually use this cache for two things. +// #1. For used IP addresses, this maps to the +// session ID that it's used by. +// #2. For un-used IP addresses, this maps to the +// index into the pool table that contains that +// IP address. +// + +int lookup_ipmap(ipt ip) { - unsigned char *a = (char *)&ip; + u8 *a = (u8 *)&ip; char **d = (char **) ip_hash; - -#ifdef STAT_CALLS - STAT(call_sessionbyip); -#endif + int s; if (!(d = (char **) d[(size_t) *a++])) return 0; if (!(d = (char **) d[(size_t) *a++])) return 0; if (!(d = (char **) d[(size_t) *a++])) return 0; - return (ipt) d[(size_t) *a]; + s = (ipt) d[(size_t) *a]; + return s; +} + +sessionidt sessionbyip(ipt ip) +{ + int s = lookup_ipmap(ip); + CSTAT(call_sessionbyip); + + if (s > 0 && s < MAXSESSION && session[s].tunnel) + return s; + return 0; } -void cache_sessionid(ipt ip, sessionidt s) +// +// Take an IP address in HOST byte order and +// add it to the sessionid by IP cache. +// +// (It's actually cached in network order) +// +static void cache_ipmap(ipt ip, int s) { - unsigned char *a = (char *) &ip; + ipt nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0] + u8 *a = (u8 *) &nip; char **d = (char **) ip_hash; int i; @@ -380,66 +514,116 @@ void cache_sessionid(ipt ip, sessionidt s) d = (char **) d[(size_t) a[i]]; } - log(4, ip, s, session[s].tunnel, "Caching session ID %d for ip address\n", 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)); + else if (s == 0) + log(4, ip, 0, 0, "Un-caching ip address %s\n", inet_toa(nip)); + // else a map to an ip pool index. } -void uncache_sessionid(ipt ip) +static void uncache_ipmap(ipt ip) { - unsigned char *a = (char *) &ip; - char **d = (char **) ip_hash; - int i; + cache_ipmap(ip, 0); // Assign it to the NULL session. +} - for (i = 0; i < 3; i++) +// +// CLI list to dump current ipcache. +// +int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) +{ + char **d = (char **) ip_hash, **e, **f, **g; + int i, j, k, l; + int count = 0; + + 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[(size_t) a[i]]) return; - d = (char **) d[(size_t) a[i]]; + if (!d[i]) + continue; + e = (char**) d[i]; + for (j = 0; j < 256; ++j) + { + if (!e[j]) + continue; + f = (char**) e[j]; + 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); + ++count; + } + } + } } - d[(size_t) a[3]] = NULL; + cli_print(cli, "%d entries in cache", count); + return CLI_OK; } + // Find session by username, 0 for not found -// walled garden'd users aren't authenticated, so the username is +// walled garden users aren't authenticated, so the username is // reasonably useless. Ignore them to avoid incorrect actions +// +// This is VERY inefficent. Don't call it often. :) +// sessionidt sessionbyuser(char *username) { int s; -#ifdef STAT_CALLS - STAT(call_sessionbyuser); -#endif - for (s = 1; s < MAXSESSION && (session[s].walled_garden || strncmp(session[s].user, username, 128)); s++); - if (s < MAXSESSION) - return s; - return 0; + CSTAT(call_sessionbyuser); + + for (s = 1; s < MAXSESSION ; ++s) + { + if (session[s].walled_garden) + continue; // Skip walled garden users. + + if (!strncmp(session[s].user, username, 128)) + return s; + + } + return 0; // Not found. } void send_garp(ipt ip) { - int s; - struct ifreq ifr; - unsigned char mac[6]; - - s = socket(PF_INET, SOCK_DGRAM, 0); - if (s < 0) - { - perror("socket"); - exit(-1); - } - memset(&ifr, 0, sizeof(ifr)); - strcpy(ifr.ifr_name, "eth0"); - if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0) - { - perror("get eth0 hwaddr"); - exit(-1); - } - memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char)); - if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) - { - perror("get eth0 ifindex"); - exit(-1); - } - close(s); - sendarp(ifr.ifr_ifindex, mac, ip); + int s; + struct ifreq ifr; + u8 mac[6]; + + s = socket(PF_INET, SOCK_DGRAM, 0); + if (s < 0) + { + log(0, 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)); + 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)); + close(s); + return; + } + close(s); + sendarp(ifr.ifr_ifindex, mac, ip); } // Find session by username, 0 for not found @@ -456,108 +640,27 @@ sessionidt sessionidtbysessiont(sessiont *s) return val; } -// send gratuitous ARP to set ARP table for newly allocated IP -void sessionsendarp(sessionidt s) +// actually send a control message for a specific tunnel +void tunnelsend(u8 * buf, u16 l, tunnelidt t) { - unsigned char mac[6]; -#ifdef STAT_CALLS - STAT(call_sendarp); -#endif - *(u16 *) (mac + 0) = htons(tapmac[0]); // set source address - *(u16 *) (mac + 2) = htons(tapmac[1]); - *(u16 *) (mac + 4) = htons(tapmac[2]); - sendarp(tapidx, mac, session[s].ip); - STAT(arp_sent); -} + struct sockaddr_in addr; -// Handle ARP requests -void processarp(u8 * buf, int len) -{ - ipt ip; - sessionidt s; + CSTAT(call_tunnelsend); -#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)) + if (!t) { - 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); + static int backtrace_count = 0; + log(0, 0, 0, t, "tunnelsend called with 0 as tunnel id\n"); + STAT(tunnel_tx_errors); + log_backtrace(backtrace_count, 5) return; } - ip = ntohl(*(u32 *) (buf + 42)); - // look up session - s = sessionbyip(htonl(ip)); - if (s) - { - log(3, ip, s, session[s].tunnel, "ARP reply for %u.%u.%u.%u\n", ip >> 24, ip >> 16 & 255, ip >> 8 & 255, ip & 255, session[s].tunnel, s); - memcpy(buf + 4, buf + 10, 6); // set destination as source - *(u16 *) (buf + 10) = htons(tapmac[0]); // set soucre 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) = htonl(ip); // sender IP - write(tapfd, buf, len); - STAT(arp_replies); - } - else - { - log(3, ip, 0, 0, "ARP request for unknown IP %u.%u.%u.%u\n", ip >> 24, ip >> 16 & 255, ip >> 8 & 255, ip & 255); - 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 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_backtrace(backtrace_count, 5) STAT(tunnel_tx_errors); return; } @@ -594,23 +697,43 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) INC_STAT(tunnel_tx_bytes, l); } +// +// Tiny helper function to write data to +// the 'tun' device. +// +int tun_write(u8 * data, int size) +{ + return write(tunfd, data, size); +} + // process outgoing (to tunnel) IP +// void processipout(u8 * buf, int len) { sessionidt s; sessiont *sp; tunnelidt t; ipt ip; - u8 b[MAXETHER]; -#ifdef STAT_CALLS - STAT(call_processipout); -#endif - if (len < 38) + + char * data = buf; // Keep a copy of the originals. + int size = len; + + u8 b[MAXETHER + 20]; + + CSTAT(call_processipout); + + if (len < MIN_IP_SIZE) { log(1, 0, 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); + STAT(tunnel_tx_errors); + return; + } // Skip the tun header buf += 4; @@ -626,31 +749,116 @@ void processipout(u8 * buf, int len) ip = *(u32 *)(buf + 16); if (!(s = sessionbyip(ip))) { -// log(4, 0, 0, 0, "IP: Can't find session for IP %s\n", inet_toa(ip)); + // Is this a packet for a session that doesn't exist? + 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) + { + 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))); + host_unreachable(*(u32 *)(buf + 12), *(u16 *)(buf + 4), ip, buf, (len < 64) ? 64 : len); + } return; } t = session[s].tunnel; sp = &session[s]; - // Snooping this session, send it to ASIO - if (sp->snoop) snoop_send_packet(buf, len); + if (sp->tbf_out) + { + // Are we throttling this session? + if (config->cluster_iam_master) + tbf_queue_packet(sp->tbf_out, data, size); + else + master_throttle_packet(sp->tbf_out, data, size); + return; + } + else if (sp->walled_garden && !config->cluster_iam_master) + { + // We are walled-gardening this + master_garden_packet(s, data, size); + 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); - // Plugin hook + // 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; + } + tunnelsend(b, len + (p-b), t); // send it... + } + + sp->cout += len; // byte count + sp->total_cout += len; // byte count + sp->pout++; + udp_tx += len; + sess_count[s].cout += len; // To send to master.. +} + +// +// Helper routine for the TBF filters. +// Used to send queued data in to the user! +// +void send_ipout(sessionidt s, u8 *buf, int len) +{ + sessiont *sp; + tunnelidt t; + ipt ip; + + u8 b[MAXETHER + 20]; + + if (len < 0 || len > MAXETHER) { - struct param_packet_rx packet = { &tunnel[t], &session[s], buf, len }; - run_plugins(PLUGIN_PACKET_RX, &packet); + log(1,0,0,0, "Odd size IP packet: %d bytes\n", len); + return; } + // Skip the tun header + buf += 4; + len -= 4; + + ip = *(u32 *)(buf + 16); + + 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. + if (sp->snoop_ip && sp->snoop_port) + snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + // Add on L2TP header { - u8 *p = makeppp(b, buf, len, t, s, PPPIP); + 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; + } tunnelsend(b, len + (p-b), t); // send it... - sp->cout += len; // byte count - sp->pout++; - udp_tx += len; } + sp->cout += len; // byte count + sp->total_cout += len; // byte count + sp->pout++; + udp_tx += len; + sess_count[s].cout += len; // To send to master.. } // add an AVP (16 bit) @@ -717,11 +925,13 @@ controlt *controlnew(u16 mtype) } // send zero block if nothing is waiting +// (ZLB send). void controlnull(tunnelidt t) { u8 buf[12]; - if (tunnel[t].controlc) + if (tunnel[t].controlc) // Messages queued; They will carry the ack. return; + *(u16 *) (buf + 0) = htons(0xC802); // flags/ver *(u16 *) (buf + 2) = htons(12); // length *(u16 *) (buf + 4) = htons(tunnel[t].far); // tunnel @@ -754,19 +964,69 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) } } +// +// Throttle or Unthrottle a session +// +// 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. +// +void throttle_session(sessionidt s, int rate_in, int rate_out) +{ + if (!session[s].tunnel) + return; // No-one home. + + if (!*session[s].user) + return; // User not logged in + + if (rate_in >= 0) + { + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) + free_tbf(session[s].tbf_in); + + if (rate_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; + + session[s].throttle_in = rate_in; + } + + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) + free_tbf(session[s].tbf_out); + + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; + + session[s].throttle_out = rate_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"); return; // not a live session + } - if (!session[s].die) + if (!dead) 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 @@ -777,17 +1037,19 @@ void sessionshutdown(sessionidt s, char *reason) } // RADIUS Stop message - if (session[s].opened && !walled_garden && !dead) { - u8 r = session[s].radius; + if (session[s].opened && !walled_garden && !dead) + { + u16 r = session[s].radius; if (!r) { - if (!radiusfree) + if (!(r = radiusnew(s))) { log(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); STAT(radius_overflow); - } else { + } + else + { int n; - r = radiusnew(s); for (n = 0; n < 15; n++) radius[r].auth[n] = rand(); } @@ -798,76 +1060,95 @@ void sessionshutdown(sessionidt s, char *reason) if (session[s].ip) { // IP allocated, clear and unroute - u8 r; - if (session[s].route[0].ip) + int r; + for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) { - routeset(session[s].ip, 0, 0, 0); - for (r = 0; r < MAXROUTE; r++) - { - if (session[s].route[r].ip) - { - routeset(session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 0); - session[s].route[r].ip = 0; - } - } + routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 0); + session[s].route[r].ip = 0; } - if (session[s].throttle) throttle_session(s, 0); session[s].throttle = 0; - free_ip_address(session[s].ip); - session[s].ip = 0; + + if (session[s].ip_pool_index == -1) // static ip + { + routeset(s, session[s].ip, 0, 0, 0); // Delete route. + session[s].ip = 0; + } + else + free_ip_address(s); } + + 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 } + cluster_send_session(s); } void sendipcp(tunnelidt t, sessionidt s) { u8 buf[MAXCONTROL]; - u8 r = session[s].radius; + 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, 0, 0, t, s, PPPIPCP); + + 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; + } + *q = ConfigReq; - q[1] = r; // ID, dont care, we only send one type of request + 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) = htonl(myip ? : session[s].ip); // send my IP (use theirs if I dont have one) + *(u32 *) (q + 6) = 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) { -#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) - radius[session[s].radius].session = 0; // cant send clean accounting data, session is killed + radiusclear(session[s].radius, s); // 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); + memset(&session[s], 0, sizeof(session[s])); + session[s].tunnel = T_FREE; // Mark it as free. session[s].next = sessionfree; sessionfree = s; - log(2, 0, s, session[s].tunnel, "Kill session %d: %s\n", s, reason); + cli_session_actions[s].action = 0; cluster_send_session(s); } @@ -876,9 +1157,11 @@ void tunnelkill(tunnelidt t, char *reason) { sessionidt s; controlt *c; -#ifdef STAT_CALLS - STAT(call_tunnelkill); -#endif + + CSTAT(call_tunnelkill); + + tunnel[t].state = TUNNELDIE; + // free control messages while ((c = tunnel[t].controls)) { @@ -889,34 +1172,38 @@ void tunnelkill(tunnelidt t, char *reason) controlfree = c; } // kill sessions - for (s = 0; s < MAXSESSION; s++) + for (s = 1; s < MAXSESSION; s++) if (session[s].tunnel == t) sessionkill(s, reason); + // free tunnel - memset(&tunnel[t], 0, sizeof(tunnel[t])); - tunnel[t].next = tunnelfree; - cluster_send_tunnel(t); + tunnelclear(t); log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason); - tunnelfree = t; + cli_tunnel_actions[s].action = 0; + cluster_send_tunnel(t); } -// shut down a tunnel +// shut down a tunnel cleanly void tunnelshutdown(tunnelidt t, char *reason) { sessionidt s; -#ifdef STAT_CALLS - STAT(call_tunnelshutdown); -#endif - if (!tunnel[t].last || !tunnel[t].far) - { // never set up, can immediately kill + + 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); + // close session - for (s = 0; s < MAXSESSION; s++) + for (s = 1; s < MAXSESSION; s++) if (session[s].tunnel == t) sessionkill(s, reason); + + tunnel[t].state = TUNNELDIE; tunnel[t].die = now() + 700; // Clean up in 70 seconds cluster_send_tunnel(t); // TBA - should we wait for sessions to stop? @@ -935,9 +1222,9 @@ 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); @@ -976,12 +1263,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) STAT(tunnel_rx_errors); return; } - if (s && !session[s].tunnel) - { - 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); - STAT(tunnel_rx_errors); - return; - } if (*buf & 0x08) { // ns/nr ns = ntohs(*(u16 *) p); @@ -1001,7 +1282,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) return; } l -= (p - buf); - if (t) tunnel[t].last = time_now; if (*buf & 0x80) { // control u16 message = 0xFFFF; // message type @@ -1015,80 +1295,96 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) int requestchap = 0; // do we request PAP instead of original CHAP request? char called[MAXTEL] = ""; // called number char calling[MAXTEL] = ""; // calling number + + 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); STAT(tunnel_rx_errors); return; } - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): %d ns %d nr %d ns %d nr %d\n", + 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) { - /* - ipt ip = ntohl(*(ipt *) & addr->sin_addr); - portt port = ntohs(addr->sin_port); + int i; - // find existing tunnel that was not fully set up - for (t = 0; t < MAXTUNNEL; t++) + // + // Is this a duplicate of the first packet? (SCCRQ) + // + for (i = 1; i <= config->cluster_highest_tunnelid ; ++i) { - if ((tunnel[t].ip == ip && tunnel[t].port == port) && - (!tunnel[t].die || !tunnel[t].hostname[0])) - { - char buf[600] = {0}; - snprintf(buf, 600, "Duplicate tunnel with %d. ip=%u port=%d die=%d hostname=%s", - t, tunnel[t].ip, tunnel[t].port, tunnel[t].die, tunnel[t].hostname); - tunnelshutdown(t, buf); - break; - } + if (tunnel[i].state != TUNNELOPENING || + tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) || + tunnel[i].port != ntohs(addr->sin_port) ) + continue; + t = i; + break; } - */ + } - t = tunnelfree; - if (!t) + if (!t) + { + if (!(t = new_tunnel())) { log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n"); STAT(tunnel_overflow); return; } - tunnelfree = tunnel[t].next; - memset(&tunnel[t], 0, sizeof(tunnelt)); + tunnelclear(t); 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); } - { // check sequence of this message + + // This is used to time out old tunnels + tunnel[t].lastrec = time_now; + + // check sequence of this message + { int skip = tunnel[t].window; // track how many in-window packets are still in queue - if (tunnel[t].controlc) - { // some to clear maybe - while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) - { - controlt *c = tunnel[t].controls; - tunnel[t].controls = c->next; - tunnel[t].controlc--; - c->next = controlfree; - controlfree = c; - skip--; - tunnel[t].try = 0; // we have progress - } + // some to clear maybe? + while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) + { + controlt *c = tunnel[t].controls; + tunnel[t].controls = c->next; + tunnel[t].controlc--; + c->next = controlfree; + controlfree = c; + skip--; + tunnel[t].try = 0; // we have progress } - if (tunnel[t].nr < ns && tunnel[t].nr != 0) + + // 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 not %d)\n", t, ns, tunnel[t].nr); + 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); -// controlnull(t); + + if (l) // Is this not a ZLB? + controlnull(t); return; } - if (l) - tunnel[t].nr++; // receiver advance (do here so quoted correctly in any sends below) - if (skip < 0) - skip = 0; + // receiver advance (do here so quoted correctly in any sends below) + if (l) tunnel[t].nr = (ns + 1); + if (skip < 0) skip = 0; if (skip < tunnel[t].controlc) - { // some control packets can now be sent that were previous stuck out of window + { + // some control packets can now be sent that were previous stuck out of window int tosend = tunnel[t].window - skip; controlt *c = tunnel[t].controls; while (c && skip) @@ -1128,7 +1424,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) if (flags & 0x40) { // handle hidden AVPs - if (!l2tpsecret) + if (!*config->l2tpsecret) { log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n"); fatal = flags; @@ -1140,7 +1436,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) fatal = flags; continue; } - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n"); + log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n"); + // Unhide the AVP + n = unhide_avp(b, t, s, n); + if (n == 0) + { + fatal = flags; + continue; + } } if (*b & 0x3C) { @@ -1173,17 +1476,21 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { 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) { + if (n >= 4) + { u16 errcode = ntohs(*(u16 *)(b + 2)); const char* errdesc = "(unknown)"; if (errcode <= MAX_ERROR_CODE) @@ -1191,14 +1498,10 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) 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[n-4+2]; - memcpy(buf, b+4, n-4); - buf[n-4+1] = '\0'; - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %s\n", - buf); - } + if (n > 4) + log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %.*s\n", + n-4, b+4); + break; } break; @@ -1222,8 +1525,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // log(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n"); break; case 5: // tie breaker - // We never open tunnels, so we don't - // care about tie breakers + // 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"); continue; case 6: // firmware revision @@ -1236,8 +1538,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // 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); + 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, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); break; case 9: // assigned tunnel @@ -1256,6 +1558,11 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) build_chap_response(b, 2, n, &chapresponse); } break; + case 13: // Response + // Why did they send a response? We never challenge. + log(2, ntohl(addr->sin_addr.s_addr), 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); @@ -1281,6 +1588,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n); log(4, ntohl(addr->sin_addr.s_addr), s, t, " Calling <%s>\n", calling); break; + case 23: // subtype + break; case 24: // tx connect speed if (n == 4) { @@ -1293,7 +1602,7 @@ 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 <%d>\n", + log(4, ntohl(addr->sin_addr.s_addr), s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed); break; case 38: // rx connect speed @@ -1308,7 +1617,7 @@ 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 <%d>\n", + log(4, ntohl(addr->sin_addr.s_addr), s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed); break; case 25: // Physical Channel ID @@ -1336,7 +1645,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) 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 (%X)\n", radius[session[s].radius].auth); + log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Challenge\n"); break; } case 32: // Proxy Authentication ID @@ -1422,11 +1731,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) control16(c, 9, t, 1); // assigned tunnel controladd(c, t, s); // send the resply } + tunnel[t].state = TUNNELOPENING; break; case 2: // SCCRP - // TBA + tunnel[t].state = TUNNELOPEN; break; case 3: // SCCN + tunnel[t].state = TUNNELOPEN; controlnull(t); // ack break; case 4: // StopCCN @@ -1454,42 +1765,42 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else { - u8 r; + u16 r; controlt *c; + s = sessionfree; + sessionfree = session[s].next; + memset(&session[s], 0, sizeof(session[s])); + + if (s > config->cluster_highest_sessionid) + config->cluster_highest_sessionid = s; + // make a RADIUS session - if (!radiusfree) + if (!(r = radiusnew(s))) { - STAT(radius_overflow); log(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n"); + sessionkill(s, "no free RADIUS sesions"); return; } c = controlnew(11); // sending ICRP - s = sessionfree; - sessionfree = session[s].next; - memset(&session[s], 0, sizeof(session[s])); session[s].id = sessionid++; session[s].opened = time(NULL); 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); control16(c, 14, s, 1); // assigned session controladd(c, t, s); // send the reply - r = radiusfree; - radiusfree = radius[r].next; - memset(&radius[r], 0, sizeof(radius[r])); - session[s].radius = r; - radius[r].session = s; { // Generate a random challenge int n; for (n = 0; n < 15; n++) radius[r].auth[n] = rand(); } - strcpy(radius[r].calling, calling); - strcpy(session[s].called, called); - strcpy(session[s].calling, calling); + strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1); + strncpy(session[s].called, called, sizeof(session[s].called) - 1); + strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1); STAT(session_created); } break; @@ -1497,8 +1808,9 @@ 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].flags = aflags; // set flags received + 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); controlnull(t); // ack // In CHAP state, request PAP instead @@ -1533,11 +1845,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) u16 prot; log_hex(5, "Receive Tunnel Data", p, l); - 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); - return; // closing session, PPP not processed - } if (l > 2 && p[0] == 0xFF && p[1] == 0x03) { // HDLC address header, discard p += 2; @@ -1560,34 +1867,83 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) p += 2; l -= 2; } + + if (s && !session[s].tunnel) // Is something wrong?? + { + if (!config->cluster_iam_master) + { + // Pass it off to the master to deal with.. + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } + + + 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); + 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); +// I'm pretty sure this isn't right -- mo. +// return; // closing session, PPP not processed + } if (prot == PPPPAP) { session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } processpap(t, s, p, l); } else if (prot == PPPCHAP) { session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } processchap(t, s, p, l); } else if (prot == PPPLCP) { session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } processlcp(t, s, p, l); } else if (prot == PPPIPCP) { session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } processipcp(t, s, p, l); } else if (prot == PPPCCP) { session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } processccp(t, s, p, l); } else if (prot == PPPIP) { - session[s].last_packet = time_now; + if (!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; processipin(t, s, p, l); } else @@ -1598,431 +1954,823 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } } -// read and process packet on tap -void processtap(u8 * buf, int len) +// read and process packet on tun +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, 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)) // ARP + + if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP processipout(buf, len); - else - { - log(1, 0, 0, 0, "Unexpected tap packet %04X, %d bytes\n", ntohs(*(u16 *) (buf + 2)), len); - } + // Else discard. } -// main loop - gets packets on tap or udp and processes them -void mainloop(void) +// +// Maximum number of actions to complete. +// This is to avoid sending out too many packets +// at once. +#define MAX_ACTIONS 500 + +int regular_cleanups(void) { - fd_set cr; - int cn; - u8 buf[65536]; - struct timeval to; - clockt slow = now(); // occasional functions like session/tunnel expiry, tunnel hello, etc - clockt next_acct = slow + ACCT_TIME; - clockt next_cluster_ping = slow + 50; - to.tv_sec = 1; - to.tv_usec = 0; - log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tapfd=%d, radfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tapfd, radfd, cluster_sockfd, controlfd); - - FD_ZERO(&cr); - FD_SET(udpfd, &cr); - FD_SET(tapfd, &cr); - FD_SET(radfd, &cr); - FD_SET(controlfd, &cr); -#ifdef HAVE_LIBCLI - FD_SET(clifd, &cr); -#endif - if (cluster_sockfd) FD_SET(cluster_sockfd, &cr); - cn = udpfd; - if (cn < radfd) cn = radfd; - if (cn < tapfd) cn = tapfd; - if (cn < controlfd) cn = controlfd; -#ifdef HAVE_LIBCLI - if (cn < clifd) cn = clifd; -#endif - if (cn < cluster_sockfd) cn = cluster_sockfd; + 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; - while (!main_quit) + log(3, 0, 0, 0, "Begin regular cleanup\n"); + + for (r = 1; r < MAXRADIUS; r++) { - fd_set r; - int n = cn; - memcpy(&r, &cr, sizeof(fd_set)); - n = select(n + 1, &r, 0, 0, &to); - if (n < 0) + if (!radius[r].state) + continue; + if (radius[r].retry) { - if (errno != EINTR) - { - perror("select"); - exit( -1); - } + 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++) + { + // check for expired tunnels + if (tunnel[t].die && tunnel[t].die <= TIME) + { + STAT(tunnel_timeout); + tunnelkill(t, "Expired"); + continue; } - else if (n) + // check for message resend + if (tunnel[t].retry && tunnel[t].controlc) { - struct sockaddr_in addr; - int alen = sizeof(addr); - if (FD_ISSET(udpfd, &r)) - processudp(buf, recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen), &addr); - else if (FD_ISSET(tapfd, &r)) - processtap(buf, read(tapfd, buf, sizeof(buf))); - else if (FD_ISSET(radfd, &r)) - processrad(buf, recv(radfd, buf, sizeof(buf), 0)); - else if (FD_ISSET(cluster_sockfd, &r)) - processcluster(buf, recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)); - else if (FD_ISSET(controlfd, &r)) - processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr); -#ifdef HAVE_LIBCLI - else if (FD_ISSET(clifd, &r)) + // resend pending messages as timeout on reply + if (tunnel[t].retry <= TIME) { - struct sockaddr_in addr; - int sockfd; - int len = sizeof(addr); - - if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0) - { - log(0, 0, 0, 0, "accept error: %s\n", strerror(errno)); - continue; - } + controlt *c = tunnel[t].controls; + u8 w = tunnel[t].window; + tunnel[t].try++; // another try + if (tunnel[t].try > 5) + tunnelkill(t, "Timeout on control message"); // game over else - { - cli_do(sockfd); - close(sockfd); - } - } -#endif - else - { - log(1, 0, 0, 0, "Main select() loop returned %d, but no fds have data waiting\n", n); - continue; - } - } - else if (n == 0) { // handle timeouts - clockt when = now(); - clockt best = when + 100; // default timeout - sessionidt s; - tunnelidt t; - u8 r; - for (r = 0; r < MAXRADIUS; r++) - if (radius[r].state && radius[r].retry) - { - if (radius[r].retry <= when) - radiusretry(r); - if (radius[r].retry && radius[r].retry < best) - best = radius[r].retry; - } - for (t = 0; t < MAXTUNNEL; t++) - { - // check for expired tunnels - if (tunnel[t].die && tunnel[t].die <= when) - { - STAT(tunnel_timeout); - tunnelkill(t, "Expired"); - continue; - } - // check for message resend - if (tunnel[t].retry && tunnel[t].controlc) - { - // resend pending messages as timeout on reply - if (tunnel[t].retry <= when) + while (c && w--) { - controlt *c = tunnel[t].controls; - u8 w = tunnel[t].window; - tunnel[t].try++; // another try - if (tunnel[t].try > 5) - tunnelkill(t, "Timeout on control message"); // game over - else - while (c && w--) - { - tunnelsend(c->buf, c->length, t); - c = c->next; - } + tunnelsend(c->buf, c->length, t); + c = c->next; } - if (tunnel[t].retry && tunnel[t].retry < best) - best = tunnel[t].retry; - } - // Send hello - if (tunnel[t].ip && !tunnel[t].die && tunnel[t].last < when + 600 && !tunnel[t].controlc) - { - controlt *c = controlnew(6); // sending HELLO - controladd(c, t, 0); // send the message - log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n"); - } } + } + // Send hello + 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"); + } -#ifdef HAVE_LIBCLI - // Check for sessions that have been killed from the CLI - if (cli_session_kill[0]) + // Check for tunnel changes requested from the CLI + if ((a = cli_tunnel_actions[t].action)) + { + cli_tunnel_actions[t].action = 0; + if (a & CLI_TUN_KILL) { - 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 CLI"); - cli_session_kill[i] = 0; - } + log(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n"); + tunnelshutdown(t, "Requested by administrator"); } - // Check for tunnels that have been killed from the CLI - if (cli_tunnel_kill[0]) + } + + } + + count = 0; + for (i = 1; i <= config->cluster_highest_sessionid; i++) + { + s++; + 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)) + { + // IPCP has not completed yet. Resend + log(3, session[s].ip, 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 <= TIME) + { + sessionkill(s, "Expired"); + if (++count >= MAX_ACTIONS) break; + continue; + } + + // Drop sessions who have not responded within IDLE_TIMEOUT seconds + if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT)) + { + sessionkill(s, "No response to LCP ECHO requests"); + STAT(session_timeout); + if (++count >= MAX_ACTIONS) break; + continue; + } + + // No data in IDLE_TIMEOUT seconds, send LCP ECHO + if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT)) + { + u8 b[MAXCONTROL] = {0}; + + u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); + if (!q) { - int i; - for (i = 0; i < MAXTUNNEL && cli_tunnel_kill[i]; i++) - { - log(2, 0, cli_tunnel_kill[i], 0, "Dropping tunnel by CLI\n"); - tunnelshutdown(cli_tunnel_kill[i], "Requested by CLI"); - cli_tunnel_kill[i] = 0; - } + log(3, session[s].ip, s, t, "failed to send ECHO packet.\n"); + continue; } -#endif - for (s = 0; s < MAXSESSION; s++) - { - // check for expired sessions - if (session[s].die && session[s].die <= when) - { - STAT(session_timeout); - sessionkill(s, "Expired"); - continue; - } + *q = EchoReq; + *(u8 *)(q + 1) = (time_now % 255); // ID + *(u16 *)(q + 2) = htons(8); // Length + *(u32 *)(q + 4) = 0; // Magic Number (not supported) - // Drop sessions who have not responded within IDLE_TIMEOUT seconds - if (session[s].user[0] && (time_now - session[s].last_packet >= IDLE_TIMEOUT)) - { - sessionkill(s, "No response to LCP ECHO requests"); - continue; - } + log(4, session[s].ip, 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; + } - // No data in IDLE_TIMEOUT seconds, send LCP ECHO - if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT)) - { - u8 b[MAXCONTROL] = {0}; - u8 *q = makeppp(b, 0, 0, session[s].tunnel, s, PPPLCP); + // Check for actions requested from the CLI + if ((a = cli_session_actions[s].action)) + { + int send = 0; - *q = EchoReq; - *(u8 *)(q + 1) = (time_now % 255); // ID - *(u16 *)(q + 2) = htons(8); // Length - *(u32 *)(q + 4) = 0; // Magic Number (not supported) + cli_session_actions[s].action = 0; + if (a & CLI_SESS_KILL) + { + log(2, 0, s, session[s].tunnel, "Dropping session by CLI\n"); + sessionshutdown(s, "Requested by administrator"); + a = 0; // dead, no need to check for other actions + } - log(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n", - time_now - session[s].last_packet); - tunnelsend(b, 24, session[s].tunnel); // send it - continue; - } + if (a & CLI_SESS_NOSNOOP) + { + log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n"); + session[s].snoop_ip = 0; + session[s].snoop_port = 0; + send++; } - if (accounting_dir && next_acct <= when) + else if (a & CLI_SESS_SNOOP) { - // Dump accounting data - next_acct = when + ACCT_TIME; - dump_acct_info(); + log(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n", + inet_toa(cli_session_actions[s].snoop_ip), 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 (cluster_sockfd && next_cluster_ping <= when) + if (a & CLI_SESS_NOTHROTTLE) + { + log(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n"); + throttle_session(s, 0, 0); + send++; + } + else if (a & CLI_SESS_THROTTLE) { - // Dump accounting data - next_cluster_ping = when + 50; - cluster_send_message(cluster_address, bind_address, C_PING, hostname, strlen(hostname)); + log(2, 0, 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 (best <= when) - best = when + 1; // should not really happen - to.tv_sec = (best - when) / 10; - to.tv_usec = 100000 * ((best - when) % 10); - log(5, 0, 0, 0, "Next time check in %d.%d seconds\n", (best - when) / 10, ((best - when) % 10)); + 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, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval); + return 0; } -// Init data structures -void initdata(void) + +// +// Are we in the middle of a tunnel update, or radius +// requests?? +// +int still_busy(void) { int i; + static clockt last_talked = 0; + static clockt start_busy_wait = 0; + if (start_busy_wait == 0) + start_busy_wait = TIME; - _statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (_statistics <= 0) - { - log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno)); - exit(1); - } - tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (tunnel <= 0) + for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) { - log(0, 0, 0, 0, "Error doing mmap 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 <= 0) - { - log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno)); - exit(1); - } - radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (radius <= 0) - { - log(0, 0, 0, 0, "Error doing mmap 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 <= 0) - { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); - exit(1); - } -#ifdef RINGBUFFER - ringbuffer = mmap(NULL, sizeof(struct Tringbuffer), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ringbuffer <= 0) - { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); - exit(1); - } - memset(ringbuffer, 0, sizeof(struct Tringbuffer)); -#endif + if (!tunnel[i].controlc) + continue; -#ifdef HAVE_LIBCLI - cli_session_kill = mmap(NULL, sizeof(sessionidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_session_kill <= 0) - { - log(0, 0, 0, 0, "Error doing mmap for cli session kill: %s\n", strerror(errno)); - exit(1); + if (last_talked != TIME) + { + log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i); + last_talked = TIME; + } + return 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 <= 0) + + // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds + if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME) { - log(0, 0, 0, 0, "Error doing mmap for cli tunnel kill: %s\n", strerror(errno)); - exit(1); + log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); + return 0; } - memset(cli_tunnel_kill, 0, sizeof(tunnelidt) * MAXSESSION); - filter_buckets = mmap(NULL, sizeof(tbft) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (filter_buckets <= 0) + for (i = 1; i < MAXRADIUS; i++) { - log(0, 0, 0, 0, "Error doing mmap for filter buckets: %s\n", strerror(errno)); - exit(1); + if (radius[i].state == RADIUSNULL) + continue; + if (radius[i].state == RADIUSWAIT) + continue; + + if (last_talked != TIME) + { + log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); + last_talked = TIME; + } + return 1; } - memset(filter_buckets, 0, sizeof(tbft) * MAXSESSION); -#endif + return 0; +} + +static fd_set readset; +static int readset_n = 0; + +// main loop - gets packets on tun or udp and processes them +void mainloop(void) +{ + int i; + u8 buf[65536]; + struct timeval to; + clockt next_cluster_ping = 0; // send initial ping immediately + time_t next_clean = time_now + config->cleanup_interval; + + log(4, 0, 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 = readset_n; +#ifdef BGP + fd_set w; + int bgp_set[BGP_NUM_PEERS]; +#endif /* BGP */ + + if (config->reload_config) + { + // Update the config state based on config settings + update_config(); + } + + memcpy(&r, &readset, sizeof(fd_set)); + to.tv_sec = 0; + to.tv_usec = 100000; // 1/10th of a second. + +#ifdef BGP + FD_ZERO(&w); + for (i = 0; i < BGP_NUM_PEERS; i++) + { + bgp_set[i] = bgp_select_state(&bgp_peers[i]); + if (bgp_set[i] & 1) + { + FD_SET(bgp_peers[i].sock, &r); + if (bgp_peers[i].sock > n) + n = bgp_peers[i].sock; + } + + if (bgp_set[i] & 2) + { + FD_SET(bgp_peers[i].sock, &w); + if (bgp_peers[i].sock > n) + n = bgp_peers[i].sock; + } + } + + n = select(n + 1, &r, &w, 0, &to); +#else /* BGP */ + n = select(n + 1, &r, 0, 0, &to); +#endif /* BGP */ + + TIME = now(); + if (n < 0) + { + 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)); + main_quit++; + break; + } + else if (n) + { + struct sockaddr_in addr; + int alen = sizeof(addr); + if (FD_ISSET(udpfd, &r)) + { + int c, n; + for (c = 0; c < config->multi_read_count; c++) + { + if ((n = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0) + processudp(buf, n, &addr); + else + break; + } + } + if (FD_ISSET(tunfd, &r)) + { + int c, n; + for (c = 0; c < config->multi_read_count; c++) + { + if ((n = read(tunfd, buf, sizeof(buf))) > 0) + processtun(buf, n); + else + break; + } + } + + 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); + + if (FD_ISSET(clifd, &r)) + { + struct sockaddr_in addr; + int sockfd; + int len = sizeof(addr); + + if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0) + { + log(0, 0, 0, 0, "accept error: %s\n", strerror(errno)); + continue; + } + else + { + cli_do(sockfd); + close(sockfd); + } + } + } + + // Runs on every machine (master and slaves). + if (cluster_sockfd && next_cluster_ping <= TIME) + { + // Check to see which of the cluster is still alive.. + + 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. + + 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.. + // Only run it every 1/10th of a second. + // Runs on all machines both master and slave. + { + static clockt last_run = 0; + if (last_run != TIME) + { + last_run = TIME; + tbf_run_timer(); + } + } + + /* Handle timeouts. Make sure that this gets run anyway, even if there was + * 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? + next_clean = time_now + 1 ; // Didn't finish. Check quickly. + } + else + { + next_clean = time_now + config->cleanup_interval; // Did. Move to next interval. + } + } + +#ifdef BGP + for (i = 0; i < BGP_NUM_PEERS; i++) + { + bgp_process(&bgp_peers[i], + bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0, + bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0); + } +#endif /* BGP */ + } + + // Are we the master and shutting down?? + 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. + cluster_send_ping(0); + + // + // Important!!! We MUST not process any packets past this point! +} + +// Init data structures +void initdata(int optdebug, char *optconfig) +{ + int i; + + if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) + { + log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); + exit(1); + } + if (!(config = shared_malloc(sizeof(struct configt)))) + { + log(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno)); + exit(1); + } + memset(config, 0, sizeof(struct configt)); + time(&config->start_time); + 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 malloc for tunnels: %s\n", strerror(errno)); + exit(1); + } + if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION))) + { + log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); + exit(1); + } + + if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION))) + { + log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno)); + exit(1); + } + + if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS))) + { + log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); + exit(1); + } + + if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL))) + { + log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno)); + exit(1); + } + +#ifdef RINGBUFFER + if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) + { + log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); + exit(1); + } + memset(ringbuffer, 0, sizeof(struct Tringbuffer)); +#endif + + if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) + { + log(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno)); + exit(1); + } + 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 malloc for cli tunnel actions: %s\n", strerror(errno)); + exit(1); + } + memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION); memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL); memset(session, 0, sizeof(sessiont) * MAXSESSION); memset(radius, 0, sizeof(radiust) * MAXRADIUS); memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); - for (i = 1; i < MAXTUNNEL - 1; i++) - tunnel[i].next = i + 1; - tunnel[MAXTUNNEL - 1].next = 0; - tunnelfree = 1; + + // Put all the sessions on the free list marked as undefined. for (i = 1; i < MAXSESSION - 1; i++) + { session[i].next = i + 1; + session[i].tunnel = T_UNDEF; // mark it as not filled in. + } session[MAXSESSION - 1].next = 0; sessionfree = 1; - for (i = 1; i < MAXRADIUS - 1; i++) - radius[i].next = i + 1; - radius[MAXRADIUS - 1].next = 0; - radiusfree = 1; + + // Mark all the tunnels as undefined (waiting to be filled in by a download). + for (i = 1; i < MAXTUNNEL- 1; i++) + tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. + if (!*hostname) { + char *p; // Grab my hostname unless it's been specified gethostname(hostname, sizeof(hostname)); - { - struct hostent *h = gethostbyname(hostname); - if (h) - myip = ntohl(*(u32 *) h->h_addr); - } + if ((p = strchr(hostname, '.'))) *p = 0; } + _statistics->start_time = _statistics->last_reset = time(NULL); - // Start the timer routine off - time(&time_now); - strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now)); +#ifdef BGP + if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS))) + { + log(0, 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 */ - system("iptables -t nat -F l2tpns"); - system("iptables -t mangle -F l2tpns"); + +// Not needed. 'nat' is setup by garden.c +// mangle isn't used (as throttling is done by tbf inhouse). } -ipt assign_ip_address() +int assign_ip_address(sessionidt s) { - int c = 0; -#ifdef STAT_CALLS - STAT(call_assign_ip_address); -#endif - ip_pool_index++; - while (1) + u32 i; + int best = -1; + time_t best_time = time_now; + char *u = session[s].user; + char reuse = 0; + + + CSTAT(call_assign_ip_address); + + for (i = 1; i < ip_pool_size; i++) { - if (ip_pool_index >= ip_pool_size) + if (!ip_address_pool[i].address || ip_address_pool[i].assigned) + continue; + + if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user)) { - if (++c == 2) - return 0; - ip_pool_index = 0; + best = i; + reuse = 1; + break; } - if (!ip_address_pool[ip_pool_index].assigned && ip_address_pool[ip_pool_index].address) + + if (ip_address_pool[i].last < best_time) { - ip_address_pool[ip_pool_index].assigned = 1; - log(4, ip_address_pool[ip_pool_index].address, 0, 0, "assign_ip_address(): Allocating ip address %lu from pool\n", ip_pool_index); - STAT(ip_allocated); - return ntohl(ip_address_pool[ip_pool_index].address); + best = i; + if (!(best_time = ip_address_pool[i].last)) + break; // never used, grab this one } - ip_pool_index++; } - return 0; + + if (best < 0) + { + log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); + return 0; + } + + session[s].ip = ip_address_pool[best].address; + session[s].ip_pool_index = best; + ip_address_pool[best].assigned = 1; + ip_address_pool[best].last = time_now; + ip_address_pool[best].session = s; + if (session[s].walled_garden) + /* Don't track addresses of users in walled garden (note: this + means that their address isn't "sticky" even if they get + un-gardened). */ + ip_address_pool[best].user[0] = 0; + else + 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); + + return 1; } -void free_ip_address(ipt address) +void free_ip_address(sessionidt s) +{ + int i = session[s].ip_pool_index; + + if (!session[s].ip) + return; // what the? + + if (i < 0) // Is this actually part of the ip pool? + i = 0; + + STAT(ip_freed); + cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index. + session[s].ip = 0; + ip_address_pool[i].assigned = 0; + ip_address_pool[i].session = 0; + ip_address_pool[i].last = time_now; + + + CSTAT(call_free_ip_address); + +} + +// +// Fsck the address pool against the session table. +// Normally only called when we become a master. +// +// This isn't perfect: We aren't keep tracking of which +// users used to have an IP address. +// +void rebuild_address_pool(void) { int i; - ipt a; -#ifdef STAT_CALLS - STAT(call_free_ip_address); -#endif - a = ntohl(address); - for (i = 0; i <= ip_pool_size; i++) + // + // Zero the IP pool allocation, and build + // a map from IP address to pool index. + for (i = 1; i < MAXIPPOOL; ++i) { - if (ip_address_pool[i].address == a) + ip_address_pool[i].assigned = 0; + ip_address_pool[i].session = 0; + if (!ip_address_pool[i].address) + continue; + + cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index. + } + + 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) { - STAT(ip_freed); - ip_address_pool[i].assigned = 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)!\n", + i, inet_toa(session[i].ip), 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); + ipid = -1; + session[i].ip_pool_index = ipid; + continue; + } + + ip_address_pool[ipid].assigned = 1; + ip_address_pool[ipid].session = i; + ip_address_pool[ipid].last = time_now; + strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1); + session[i].ip_pool_index = ipid; + cache_ipmap(session[i].ip, i); // Fix the ip map. + } +} + +// +// Fix the address pool to match a changed session. +// (usually when the master sends us an update). +void fix_address_pool(int sid) +{ + int ipid; + + ipid = session[sid].ip_pool_index; + + if (ipid > ip_pool_size) + return; // Ignore it. rebuild_address_pool will fix it up. + + if (ip_address_pool[ipid].address != session[sid].ip) + return; // Just ignore it. rebuild_address_pool will take care of it. + + ip_address_pool[ipid].assigned = 1; + ip_address_pool[ipid].session = sid; + ip_address_pool[ipid].last = time_now; + strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1); +} + +// +// Add a block of addresses to the IP pool to hand out. +// +void add_to_ip_pool(u32 addr, u32 mask) +{ + int i; + if (mask == 0) + mask = 0xffffffff; // Host route only. + + addr &= mask; + + if (ip_pool_size >= MAXIPPOOL) // Pool is full! + return ; + + for (i = addr ;(i & mask) == addr; ++i) + { + if ((i & 0xff) == 0 || (i&0xff) == 255) + continue; // Skip 0 and broadcast addresses. + + ip_address_pool[ip_pool_size].address = i; + ip_address_pool[ip_pool_size].assigned = 0; + ++ip_pool_size; + if (ip_pool_size >= MAXIPPOOL) + { + log(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr)) ); + return; } } - uncache_sessionid(htonl(address)); } // Initialize the IP address pool void initippool() { FILE *f; - char *buf, *p; - int pi = 0; + char *p; + char buf[4096]; memset(ip_address_pool, 0, sizeof(ip_address_pool)); if (!(f = fopen(IPPOOLFILE, "r"))) { log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); - exit(-1); + exit(1); } - buf = (char *)malloc(4096); - - while (pi < MAXIPPOOL && fgets(buf, 4096, f)) + while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f)) { - char* pool = buf; + char *pool = buf; + buf[4095] = 0; // Force it to be zero terminated/ + if (*buf == '#' || *buf == '\n') continue; // Skip comments / blank lines if ((p = (char *)strrchr(buf, '\n'))) *p = 0; @@ -2033,11 +2781,11 @@ void initippool() src = inet_addr(buf); if (src == INADDR_NONE) { - log(0, 0, 0, 0, "Invalid address pool IP %s", buf); - exit(-1); + log(0, 0, 0, 0, "Invalid address pool IP %s\n", buf); + exit(1); } // This entry is for a specific IP only - if (src != bind_address) + if (src != config->bind_address) continue; *p = ':'; pool = p+1; @@ -2046,59 +2794,46 @@ void initippool() { // It's a range int numbits = 0; - unsigned long start = 0, end = 0, mask = 0, ip; - struct rtentry r; + u32 start = 0, mask = 0; log(2, 0, 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, p); + log(0, 0, 0, 0, "Invalid pool range %s\n", buf); continue; } - start = end = ntohl(inet_addr(pool)); - mask = (unsigned long)(pow(2, numbits) - 1) << (32 - numbits); - start &= mask; - end = start + (int)(pow(2, (32 - numbits))) - 1; - for (ip = (start + 1); ip < end && pi < MAXIPPOOL; ip++) - { - if ((ip & 0xFF) == 0 || (ip & 0xFF) == 255) - continue; - ip_address_pool[pi++].address = htonl(ip); - } + 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/%d\n", inet_toa(htonl(start)), 32+mask); - memset(&r, 0, sizeof(r)); - r.rt_dev = tapdevice; - r.rt_dst.sa_family = AF_INET; - *(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(start); - r.rt_genmask.sa_family = AF_INET; - *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask); - r.rt_flags = (RTF_UP | RTF_STATIC); - if (ioctl(ifrfd, SIOCADDRT, (void *) &r) < 0) - { - log(0, 0, 0, 0, "Error adding ip address pool route %s/%d: %s\n", inet_toa(start), mask, strerror(errno)); - } + log(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start)), 32 + mask); + routeset(0, start, mask, 0, 1); + + add_to_ip_pool(start, mask); } else { // It's a single ip address - ip_address_pool[pi++].address = inet_addr(pool); + add_to_ip_pool(inet_addr(pool), 0); } } - - free(buf); fclose(f); - log(1, 0, 0, 0, "IP address pool is %d addresses\n", pi); - ip_pool_size = pi; + log(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); } -void snoop_send_packet(char *packet, u16 size) +void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port) { - if (!snoop_addr.sin_port || snoopfd <= 0 || size <= 0 || !packet) + 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)); 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)); STAT(packets_snooped); @@ -2106,198 +2841,260 @@ void snoop_send_packet(char *packet, u16 size) 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", accounting_dir, timestr); - for (i = 0; i < MAXSESSION; i++) - { - if (!session[i].opened || !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 %lu %lu\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (unsigned long)session[i].cin, // uptxoctets - (unsigned long)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, 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_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; + int optdebug = 0; + char *optconfig = CONFIGFILE; _program_name = strdup(argv[0]); - { - struct rlimit rlim; - rlim.rlim_cur = RLIM_INFINITY; - rlim.rlim_max = RLIM_INFINITY; - // Remove the maximum core size - setrlimit(RLIMIT_CORE, &rlim); - // Make core dumps go to /tmp - chdir("/tmp"); - } - time(&basetime); // start clock - // scan args - while ((o = getopt(argc, argv, "vc:f:h:a:")) >= 0) + // scan args + while ((o = getopt(argc, argv, "dvc:h:")) >= 0) { switch (o) { + case 'd': + // Double fork to detach from terminal + if (fork()) exit(0); + if (fork()) exit(0); + break; case 'v': - debug++; + optdebug++; break; case 'c': - config_file = strdup(optarg); - break; - case 'f': - log_filename = strdup(optarg); + optconfig = optarg; break; case 'h': - strncpy(hostname, optarg, 1000); - break; - case 'a': - myip = inet_addr(optarg); - if (myip == INADDR_NONE) { - log(0, 0, 0, 0, "Invalid ip %s\n", optarg); - exit(-1); - } - bind_address = myip; - handle_interface = 1; + snprintf(hostname, sizeof(hostname), "%s", optarg); break; - case '?': default: - printf("Args are:\n\t-c \tConfig file\n\t-h \tForce hostname\n\t-a
\tUse specific address\n\t-f \tLog File\n\t-v\t\tDebug\n"); + 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; } } + // Start the timer routine off + time(&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(optdebug, optconfig); + + init_cli(hostname); read_config_file(); - initdata(); - log(0, 0, 0, 0, "$Id: l2tpns.c,v 1.1 2003/12/16 07:07:39 fred_nerk Exp $\n(c) Copyright 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); + init_tbf(config->num_tbfs); + + log(0, 0, 0, 0, "L2TPNS version " VERSION "\n"); + log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n"); + log(0, 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)); + // Make core dumps go to /tmp + chdir("/tmp"); + } + + if (config->scheduler_fifo) + { + int ret; + struct sched_param params = {0}; + params.sched_priority = 1; - /* Start up the cluster first, so that we don't have two machines with - * the same IP at once. - * This is still racy, but the second GARP should fix that - */ - cluster_init(bind_address, 0); - cluster_send_message(cluster_address, bind_address, C_HELLO, hostname, strlen(hostname)); + if (get_nprocs() < 2) + { + log(0, 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"); + } + else + { + log(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); + config->scheduler_fifo = 0; + } + } + } - inittap(); - log(1, 0, 0, 0, "Set up on interface %s\n", tapdevice); + /* Set up the cluster communications port. */ + if (cluster_init(config->bind_address) < 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); +#endif /* BGP */ + + inittun(); + log(1, 0, 0, 0, "Set up on interface %s\n", config->tundevice); initudp(); initrad(); initippool(); - init_rl(); - if (handle_interface) { - send_garp(bind_address); - } - read_state(); -#ifdef HAVE_LIBCLI - init_cli(); -#endif + read_state(); - signal(SIGALRM, sigalrm_handler); signal(SIGHUP, sighup_handler); signal(SIGTERM, sigterm_handler); signal(SIGINT, sigterm_handler); signal(SIGQUIT, sigquit_handler); signal(SIGCHLD, sigchild_handler); - signal(SIGSEGV, sigsegv_handler); - if (debug) + + // Prevent us from getting paged out + if (config->lock_pages) { - int n; - for (n = 0; n < numradiusservers; n++) - log(1, 0, 0, 0, "RADIUS to %s\n", inet_toa(htonl(radiusserver[n]))); + if (!mlockall(MCL_CURRENT)) + log(1, 0, 0, 0, "Locking pages into memory\n"); + else + log(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno)); } alarm(1); // Drop privileges here - if (target_uid > 0 && geteuid() == 0) - setuid(target_uid); + if (config->target_uid > 0 && geteuid() == 0) + setuid(config->target_uid); mainloop(); - if (l2tpsecret) free(l2tpsecret); - if (log_filename) free(log_filename); - if (snoop_destination_host) free(snoop_destination_host); - if (radiussecret) free(radiussecret); +#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]); + } +#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) { - if (log_stream != stderr) + if (log_stream && log_stream != stderr) + { fclose(log_stream); + log_stream = NULL; + } - log_stream = NULL; read_config_file(); } void sigalrm_handler(int junk) { // Log current traffic stats - if (dump_speed) - { - printf("UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%lu OUT:%lu\n", - (udp_rx / 1024.0 / 1024.0 * 8), - (eth_tx / 1024.0 / 1024.0 * 8), - (eth_rx / 1024.0 / 1024.0 * 8), - (udp_tx / 1024.0 / 1024.0 * 8), - ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8), - udp_rx_pkt, eth_rx_pkt); - udp_tx = udp_rx = 0; - udp_rx_pkt = eth_rx_pkt = 0; - eth_tx = eth_rx = 0; - } + snprintf(config->bandwidth, sizeof(config->bandwidth), + "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u", + (udp_rx / 1024.0 / 1024.0 * 8), + (eth_tx / 1024.0 / 1024.0 * 8), + (eth_rx / 1024.0 / 1024.0 * 8), + (udp_tx / 1024.0 / 1024.0 * 8), + ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8), + udp_rx_pkt, eth_rx_pkt); + + udp_tx = udp_rx = 0; + udp_rx_pkt = eth_rx_pkt = 0; + eth_tx = eth_rx = 0; + + if (config->dump_speed) + printf("%s\n", config->bandwidth); // 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); { @@ -2311,187 +3108,211 @@ void sigalrm_handler(int junk) void sigterm_handler(int junk) { log(1, 0, 0, 0, "Shutting down cleanly\n"); - if (config_save_state) + if (config->save_state) dump_state(); + main_quit++; } void sigquit_handler(int junk) { int i; + log(1, 0, 0, 0, "Shutting down without saving sessions\n"); - for (i = 0; i < MAXSESSION; i++) + for (i = 1; i < MAXSESSION; i++) { if (session[i].opened) sessionkill(i, "L2TPNS Closing"); } - for (i = 0; i < MAXTUNNEL; i++) + for (i = 1; i < MAXTUNNEL; i++) { - if (tunnel[i].ip) + if (tunnel[i].ip || tunnel[i].state) tunnelshutdown(i, "L2TPNS Closing"); } + main_quit++; } void sigchild_handler(int signal) { - int status; - int pid; - - pid = wait(&status); -#ifdef HAVE_LIBCLI - status = (WIFEXITED(status)) ? WEXITSTATUS(status) : 0; - if (pid == cli_pid) - { - if (status == 0) - log(3, 0, 0, 0, "CLI client closed connection\n"); - else - log(2, 0, 0, 0, "CLI child died with rc %d!\n", status); - } -#endif -} - -void *backtrace_buffer[30] = {0}; - -void sigsegv_handler(int signal) -{ - log(0, 0, 0, 0, "----------------------------------------------\n"); - log(0, 0, 0, 0, "- SEGFAULT! -\n"); - log(0, 0, 0, 0, "----------------------------------------------\n"); - _exit(0); + while (waitpid(-1, NULL, WNOHANG) > 0) + ; } void read_state() { struct stat sb; + int i; + ippoolt itmp; FILE *f; + char magic[sizeof(DUMP_MAGIC) - 1]; + u32 buf[2]; - if (!config_save_state) return; + if (!config->save_state) + { + unlink(STATEFILE); + return ; + } if (stat(STATEFILE, &sb) < 0) - return; + { + unlink(STATEFILE); + return ; + } if (sb.st_mtime < (time(NULL) - 60)) { - log(0, 0, 0, 0, "State file is too old to read\n"); + log(0, 0, 0, 0, "State file is too old to read, ignoring\n"); unlink(STATEFILE); - return; + return ; } - if (!(f = fopen(STATEFILE, "r"))) + f = fopen(STATEFILE, "r"); + unlink(STATEFILE); + + if (!f) { log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno)); - unlink(STATEFILE); - return; + 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); } - fseek(f, 0, 0); log(1, 0, 0, 0, "Reading state information\n"); + if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt)) { - u32 i, numtunnels; - if (fread(&numtunnels, sizeof(numtunnels), 1, f) <= 0) - { - log(0, 0, 0, 0, "Error reading saved state (tunnel count): %s\n", strerror(errno)); - fclose(f); - unlink(STATEFILE); - return; - } - log(2, 0, 0, 0, "Reading %lu tunnels\n", numtunnels); - fread(tunnel, sizeof(tunnelt), numtunnels, f); - tunnelfree = 0; - for (i = 0; i < numtunnels; 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); - tunnelfree = i; - } - } - tunnelfree++; + log(0, 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); } + + log(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]); + for (i = 0; i < buf[0]; i++) { - u32 i, numsessions; - if (fread(&numsessions, sizeof(numsessions), 1, f) <= 0) + if (fread(&itmp, sizeof(itmp), 1, f) != 1) { - log(0, 0, 0, 0, "Error reading saved state (session count): %s\n", strerror(errno)); - fclose(f); - unlink(STATEFILE); - return; + log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno)); + exit(1); } - log(2, 0, 0, 0, "Reading %lu sessions\n", numsessions); - if (fread(session, sizeof(sessiont), numsessions, f) < numsessions) + + if (itmp.address != ip_address_pool[i].address) { - log(0, 0, 0, 0, "Error reading saved state (%d sessions): %s\n", numsessions, strerror(errno)); - fclose(f); - unlink(STATEFILE); - return; + log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i); + exit(1); } - for (i = 0; i < numsessions; i++) + + memcpy(&ip_address_pool[i], &itmp, sizeof(itmp)); + } + + 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); + } + + 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); + } + + 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); + } + + for (i = 0; i < MAXSESSION; i++) + { + session[i].tbf_in = 0; + session[i].tbf_out = 0; + if (session[i].opened) { - session[i].tbf = 0; - session[i].throttle = 0; - if (session[i].opened) - { - log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user); - if (session[i].ip && session[i].ip != 0xFFFFFFFE) - { - int x; - sessionsetup(session[i].tunnel, i, 0); - for (x = 0; x < MAXIPPOOL && ip_address_pool[x].address; x++) - { - if (ip_address_pool[x].address == session[i].ip) - { - ip_address_pool[x].assigned = 1; - break; - } - } - } - else - { - log(2, 0, i, 0, "No IP for session\n"); - } - } + log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user); + if (session[i].ip) + sessionsetup(session[i].tunnel, i); } - for (i = 0; i < numsessions && session[i].opened; i++) - sessionfree = session[i].next; } + fclose(f); log(0, 0, 0, 0, "Loaded saved state information\n"); - unlink(STATEFILE); } void dump_state() { FILE *f; + u32 buf[2]; - if (!config_save_state) return; + if (!config->save_state) + return; - if ((f = fopen(STATEFILE, "w"))) + do { - u32 i; - log(1, 0, 0, 0, "Dumping state information\n"); + if (!(f = fopen(STATEFILE, "w"))) + break; - i = MAXTUNNEL; - fwrite(&i, sizeof(i), 1, f); // Number of tunnels - - log(2, 0, 0, 0, "Dumping %lu tunnels\n", i); - fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f); - - i = MAXSESSION; - fwrite(&i, sizeof(i), 1, f); // Number of sessions - log(2, 0, 0, 0, "Dumping %lu sessions\n", i); - fwrite(session, sizeof(sessiont), MAXSESSION, f); + log(1, 0, 0, 0, "Dumping state information\n"); - fclose(f); - } - else - { - log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno)); + 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, 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; + + if (fclose(f) == 0) + return ; // OK } - return; + while (0); + + log(0, 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) @@ -2499,19 +3320,11 @@ void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **ch MD5_CTX ctx; *challenge_response = NULL; - if (!l2tpsecret || !*l2tpsecret) - { - log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); - return; - } - - /* - if (challenge_length != 16) + if (!*config->l2tpsecret) { - log(0, 0, 0, 0, "Challenge length != 16.\n"); + log(0, 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"); @@ -2519,284 +3332,360 @@ void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **ch MD5Init(&ctx); MD5Update(&ctx, &id, 1); - MD5Update(&ctx, l2tpsecret, strlen(l2tpsecret)); + MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); MD5Update(&ctx, challenge, challenge_length); MD5Final(*challenge_response, &ctx); return; } -void read_config_file() +static int facility_value(char *name) { - FILE *f; - char *buf; - - if (!config_file) return; - if (!(f = fopen(config_file, "r"))) { - fprintf(stderr, "Can't open config file %s: %s\n", config_file, strerror(errno)); - return; + 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() +{ + int i; + static int timeout = 0; + static int interval = 0; - if (radiussecret) + // Update logging + closelog(); + syslog_log = 0; + if (log_stream) { - free(radiussecret); - radiussecret = NULL; + fclose(log_stream); + log_stream = NULL; } - - if (l2tpsecret) + if (*config->log_filename) { - free(l2tpsecret); - l2tpsecret = NULL; + if (strstr(config->log_filename, "syslog:") == config->log_filename) + { + char *p = config->log_filename + 7; + if (*p) + { + openlog("l2tpns", LOG_PID, facility_value(p)); + syslog_log = 1; + } + } + else if (strchr(config->log_filename, '/') == config->log_filename) + { + if ((log_stream = fopen((char *)(config->log_filename), "a"))) + { + fseek(log_stream, 0, SEEK_END); + setbuf(log_stream, NULL); + } + else + { + log_stream = stderr; + setbuf(log_stream, NULL); + } + } } - - if (log_filename) + else { - free(log_filename); - log_filename = NULL; + log_stream = stderr; + setbuf(log_stream, NULL); } - if (snoop_destination_host) + + // Update radius + config->numradiusservers = 0; + for (i = 0; i < MAXRADSERVER; i++) + 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) { - free(snoop_destination_host); - snoop_destination_host = NULL; + log(0, 0, 0, 0, "No RADIUS servers defined!\n"); } - if (numradiusservers) { - int n; - for (n = 0; n < numradiusservers; n++) - radiusserver[n] = 0; - numradiusservers = 0; - } + config->num_radfds = 2 << RADIUS_SHIFT; - snoop_destination_port = 0L; - config_save_state = 0; - rl_rate = 0L; - debug = 1; - default_dns1 = default_dns2 = 0; - radius_accounting = 0; + // Update plugins + for (i = 0; i < MAXPLUGINS; i++) + { + if (strcmp(config->plugins[i], config->old_plugins[i]) == 0) + continue; + if (*config->plugins[i]) + { + // Plugin added + add_plugin(config->plugins[i]); + } + else if (*config->old_plugins[i]) + { + // Plugin removed + remove_plugin(config->old_plugins[i]); + } + } + 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 = 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); - buf = (char *)malloc(4096); + if (!config->cluster_hb_interval) + config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds. - while (fgets(buf, 4096, f)) { - char *p, *t; + if (!config->cluster_hb_timeout) + config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election. - if (*buf == '#') continue; - if ((p = strchr(buf, '\n'))) *p = 0; - p = t = strchr(buf, '='); - if (!p) continue; - *p = 0; p++; - t--; - while (*p && *p == ' ') p++; - while (*t && *t == ' ') *t-- = 0; + 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 (strcmp(buf, "log file") == 0) { - if (!log_filename) - log_filename = strdup(p); - } else if (strcmp(buf, "l2tp secret") == 0) { - if (!l2tpsecret) - l2tpsecret = strdup(p); - log(0, 0, 0, 0, "L2TP Secret is \"%s\"\n", l2tpsecret); - } else if (strcmp(buf, "radius secret") == 0) { - if (!radiussecret) - radiussecret = strdup(p); - log(4, 0, 0, 0, "Radius Secret is \"%s\"\n", radiussecret); - } else if (strcmp(buf, "radius accounting") == 0) { - radius_accounting = atoi(p); - log(4, 0, 0, 0, "Radius Account is %s\n", radius_accounting ? "on" : "off"); - } else if (strcmp(buf, "throttle rate") == 0) { - rl_rate = atol(p); - if (rl_rate == 0) - { - log(1, 0, 0, 0, "Disabled throttling.\n"); - } - else - { - log(1, 0, 0, 0, "Enabled throttling (rate is %lu kbits/s)\n", rl_rate); - } - } else if (strcmp(buf, "debug") == 0) { - debug = atoi(p); - log(debug, 0, 0, 0, "Set debugging level to %d\n", debug); - } else if (strcmp(buf, "accounting dir") == 0) { - accounting_dir = strdup(p); - log(debug, 0, 0, 0, "Will dump accounting information to %s\n", accounting_dir); - } else if (strcmp(buf, "dns server") == 0) { - unsigned long addr = 0; - if (inet_aton(p, (struct in_addr *)&addr) < 0) { - printf("Invalid DNS server %s\n", p); - continue; - } - if (default_dns1 == 0) - default_dns1 = addr; - else if (default_dns2 == 0) - default_dns2 = addr; - } else if (strcmp(buf, "radius server") == 0) { - struct hostent *h = gethostbyname(p); - if (h) - { - while (*h->h_addr_list) - { - ipt ip = ntohl(*(u32 *) * h->h_addr_list); - if (numradiusservers < MAXRADSERVER) - radiusserver[numradiusservers++] = ip; - else - log(0, 0, 0, 0, "Too many RADIUS IPs\n"); - h->h_addr_list++; - } - } - else - { // may be IP? - ipt ip = ntohl(inet_addr(p)); - if (ip && ip != 0xFFFFFFFF) - { - if (numradiusservers < MAXRADSERVER) - radiusserver[numradiusservers++] = ip; - else - log(0, 0, 0, 0, "Too many RADIUS IPs\n"); - } - else - log(0, 0, 0, 0, "Unknown server %s\n", p); - } - } else if (strcmp(buf, "snoop host") == 0) { - snoop_destination_host = strdup(p); - } else if (strcmp(buf, "snoop port") == 0) { - snoop_destination_port = atol(p); - } else if (strcmp(buf, "bind address") == 0) { - if (!bind_address) - { - // Already overridden on the command line - bind_address = inet_addr(p); - handle_interface = 1; - } - } else if (strcmp(buf, "dump speed") == 0) { - dump_speed = atoi(p); - } else if (strcmp(buf, "setuid") == 0) { - target_uid = atoi(p); - } else if (strcmp(buf, "cluster master") == 0) { - struct hostent *h = gethostbyname(p); - if (h) - { - if (*h->h_addr_list) - { - cluster_address = *(u32 *) *h->h_addr_list; - } - } - else - { // may be IP? - cluster_address = inet_addr(p); - } - } else if (strcmp(buf, "save state") == 0) { - if (strcasecmp(p, "no") == 0) { - config_save_state = 0; - } else { - config_save_state = 1; - } - } else if (strcmp(buf, "plugin") == 0) { - add_plugin(p); - } else { - struct param_config cp = { buf, p }; - int rc = run_plugins(PLUGIN_CONFIG, &cp); - if (rc == 0) log(0, 0, 0, 0, "Unknown config directive \"%s\"\n", buf); + if (config->cluster_hb_timeout < t) + { + log(0,0,0,0, "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; } - if (snoop_destination_host) + // Write PID file + if (*config->pid_file == '/' && !config->wrote_pid) { - if (inet_aton(snoop_destination_host, &snoop_addr.sin_addr)) + FILE *f; + if ((f = fopen(config->pid_file, "w"))) { - snoop_addr.sin_port = htons(snoop_destination_port); - snoop_addr.sin_family = AF_INET; + fprintf(f, "%d\n", getpid()); + fclose(f); + config->wrote_pid = 1; } else { - log(0, 0, 0, 0, "Can't find address for snoop host %s\n", snoop_destination_host); + log(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); } } - free(buf); + config->reload_config = 0; +} + +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); + cli_do_file(f); + log(3, 0, 0, 0, "Done reading config file\n"); fclose(f); - log(2, 0, 0, 0, "Done reading config file\n"); + update_config(); } -int sessionsetup(tunnelidt t, sessionidt s, u8 routes) +int sessionsetup(tunnelidt t, sessionidt s) { // A session now exists, set it up ipt ip; char *user; sessionidt i; -#ifdef STAT_CALLS - STAT(call_sessionsetup); -#endif + int r; + + CSTAT(call_sessionsetup); + log(3, session[s].ip, s, t, "Doing session setup for session\n"); - if (!session[s].ip) { - log(0, session[s].ip, s, t, "VERY VERY BAD! sessionsetup() called with no session[s].ip\n"); - return 1; - } - if (session[s].ip == 0xFFFFFFFE) - { - session[s].ip = assign_ip_address(); // Assign one from the pool; - log(2, session[s].ip, s, t, "IP assigned is a magic token. Assign address from pool: %s\n", - inet_toa(htonl(session[s].ip))); + 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"); + sessionshutdown(s, "No IP addresses available"); + return 0; + } } + // Make sure this is right session[s].tunnel = t; + // zap old sessions with same IP and/or username - // Don't kill walled_garden sessions - doing so leads to a DoS + // Don't kill gardened sessions - doing so leads to a DoS // from someone who doesn't need to know the password - ip = session[s].ip; - user = session[s].user; - for (i = 0; i < MAXSESSION; i++) - { - if (i == s) continue; - if (ip == session[i].ip) sessionkill(i, "Duplicate IP address"); - if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0) - sessionkill(i, "Duplicate session for user"); - } - - if (routes) { - if (session[s].route[routes].ip && session[s].route[routes].mask) + ip = session[s].ip; + user = session[s].user; + for (i = 1; i <= config->cluster_highest_sessionid; i++) { - log(2, session[s].ip, s, t, "Routing session\n"); - routeset(session[s].ip, 0, 0, 1); - while (routes--) - routeset(session[s].route[routes].ip, session[s].route[routes].mask, - session[s].ip, 1); + if (i == s) continue; + if (ip == session[i].ip) sessionkill(i, "Duplicate IP address"); + if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0) + sessionkill(i, "Duplicate session for users"); } } - sessionsendarp(s); - if (!session[s].sid) - sendipcp(t, s); - // Force throttling on or off - // 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); + // 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++) + routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1); + + if (!session[s].unique_id) + { + // did this session just finish radius? + log(3, session[s].ip, s, t, "Sending initial IPCP to client\n"); + sendipcp(t, s); + session[s].unique_id = ++last_id; + } + // Run the plugin's against this new session. { struct param_new_session data = { &tunnel[t], &session[s] }; run_plugins(PLUGIN_NEW_SESSION, &data); } - session[s].sid = ++last_sid; - cache_sessionid(htonl(session[s].ip), s); + // Allocate TBFs if throttled + if (session[s].throttle_in || session[s].throttle_out) + throttle_session(s, session[s].throttle_in, session[s].throttle_out); - cluster_send_session(s); session[s].last_packet = time_now; + { char *sessionip, *tunnelip; - sessionip = strdup(inet_toa(ntohl(session[s].ip))); - tunnelip = strdup(inet_toa(ntohl(tunnel[t].ip))); + 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); } + cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster. + return 1; // RADIUS OK and IP allocated, done... } +// +// This session just got dropped on us by the master or something. +// Make sure our tables up up to date... +// +int load_session(sessionidt s, sessiont *new) +{ + int i; + + // Sanity checks. + if (new->ip_pool_index >= MAXIPPOOL || + new->tunnel >= MAXTUNNEL) + { + log(0,0,s,0, "Strange session update received!\n"); + // FIXME! What to do here? + return 0; + } + + // + // Ok. All sanity checks passed. Now we're committed to + // loading the new session. + // + + session[s].tunnel = new->tunnel; // For logging in cache_ipmap + + + if (new->ip != session[s].ip) // Changed ip. fix up hash tables. + { + if (session[s].ip) // If there's an old one, remove it. + { + // Remove any routes if the IP has changed + for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++) + { + routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0); + session[s].route[i].ip = 0; + } + + 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, remove it manually. + uncache_ipmap(session[s].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); + else + cache_ipmap(new->ip, s); + } + } + + // Update routed networks + for (i = 0; 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) + 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].ip, 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->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) { @@ -2822,28 +3711,33 @@ void initplugins() plugins[i] = ll_init(); } +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); + return dlopen(path, RTLD_NOW); +} + void add_plugin(char *plugin_name) { - void *p; + static struct pluginfuncs funcs = { + _log, + _log_hex, + inet_toa, + sessionbyuser, + sessiontbysessionidt, + sessionidtbysessiont, + sessionkill, + radiusnew, + radiussend, + }; + + void *p = open_plugin(plugin_name, 1); int (*initfunc)(struct pluginfuncs *); - char path[256] = {0}; int i; - struct pluginfuncs funcs; - - funcs._log = _log; - funcs._log_hex = _log_hex; - funcs.inet_toa = inet_toa; - funcs.get_session_by_username = sessionbyuser; - funcs.get_session_by_id = sessiontbysessionidt; - funcs.get_id_by_session = sessionidtbysessiont; - funcs.sessionkill = sessionkill; - funcs.radiusnew = radiusnew; - funcs.radiussend = radiussend; - - snprintf(path, 256, "%s/%s.so", LIBDIR, plugin_name); - - log(2, 0, 0, 0, "Loading plugin from %s\n", path); - p = dlopen(path, RTLD_NOW); + if (!p) { log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror()); @@ -2860,70 +3754,66 @@ void add_plugin(char *plugin_name) int *v = dlsym(p, "__plugin_api_version"); if (!v || *v != PLUGIN_API_VERSION) { - log(1, 0, 0, 0, " Plugin load failed: API version mismatch\n", dlerror()); + log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); dlclose(p); return; } } - initfunc = dlsym(p, "plugin_init"); - if (!initfunc) + if ((initfunc = dlsym(p, "plugin_init"))) { - log(1, 0, 0, 0, " Plugin load failed: function plugin_init() does not exist.\n", dlerror()); - dlclose(p); - return; + if (!initfunc(&funcs)) + { + log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); + dlclose(p); + return; + } } - if (!initfunc(&funcs)) - { - log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE.\n", dlerror()); - dlclose(p); - return; - } + ll_push(loaded_plugins, p); for (i = 0; i < max_plugin_functions; i++) { void *x; - if (!plugin_functions[i]) continue; - if ((x = dlsym(p, plugin_functions[i]))) + if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) { log(3, 0, 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); } +static void run_plugin_done(void *plugin) +{ + int (*donefunc)(void) = dlsym(plugin, "plugin_done"); + + if (donefunc) + donefunc(); +} + void remove_plugin(char *plugin_name) { - void *p; - int (*donefunc)(); - char path[256] = {0}; + void *p = open_plugin(plugin_name, 0); int i; - snprintf(path, 256, "%s/%s.so", LIBDIR, plugin_name); - - log(2, 0, 0, 0, "Removing plugin %s\n", plugin_name); - // Get the existing pointer - p = dlopen(path, RTLD_LAZY); - if (!p) return; + if (!p) + return; for (i = 0; i < max_plugin_functions; i++) { void *x; - if (!plugin_functions[i]) continue; - if ((x = dlsym(p, plugin_functions[i]))) ll_delete(plugins[i], x); + if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) + ll_delete(plugins[i], x); } if (ll_contains(loaded_plugins, p)) { ll_delete(loaded_plugins, p); - - donefunc = dlsym(p, "plugin_done"); - if (donefunc) donefunc(); + run_plugin_done(p); } - dlclose(p); dlclose(p); log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name); } @@ -2944,14 +3834,27 @@ int run_plugins(int plugin_type, void *data) return 1; } +void plugins_done() +{ + void *p; + + ll_reset(loaded_plugins); + while ((p = ll_next(loaded_plugins))) + run_plugin_done(p); +} + void processcontrol(u8 * buf, int len, struct sockaddr_in *addr) { char *resp; int l; struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 }; - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received "); - dump_packet(buf, log_stream); + + if (log_stream && config->debug >= 4) + { + log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received "); + dump_packet(buf, log_stream); + } resp = calloc(1400, 1); l = new_packet(PKT_RESP_ERROR, resp); @@ -2964,25 +3867,247 @@ void processcontrol(u8 * buf, int len, struct sockaddr_in *addr) param.response = resp; param.response_length = l; - if (param.type == PKT_LOAD_PLUGIN && param.data_length) + run_plugins(PLUGIN_CONTROL, ¶m); + + if (param.send_response) { - add_plugin(param.data); + 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"); } - else if (param.type == PKT_UNLOAD_PLUGIN && param.data_length) + + free(resp); +} + +/* + * HACK + * Go through all of the tunnels and do some cleanups + */ +void tunnel_clean() +{ + int i; + + log(1, 0, 0, 0, "Cleaning tunnels array\n"); + + for (i = 1; i < MAXTUNNEL; i++) { - remove_plugin(param.data); + if (!tunnel[i].ip + || !*tunnel[i].hostname + || (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now)) + { + tunnelclear(i); + } } - else +} + +void tunnelclear(tunnelidt t) +{ + if (!t) return; + memset(&tunnel[t], 0, sizeof(tunnel[t])); + tunnel[t].state = TUNNELFREE; +} + +tunnelidt new_tunnel() +{ + tunnelidt i; + for (i = 1; i < MAXTUNNEL; i++) { - run_plugins(PLUGIN_CONTROL, ¶m); + if (tunnel[i].state == TUNNELFREE) + { + log(4, 0, 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"); + return 0; +} - if (param.send_response) +// +// We're becoming the master. Do any required setup.. +// +// This is principally telling all the plugins that we're +// now a master, and telling them about all the sessions +// that are active too.. +// +void become_master(void) +{ + int s, i; + run_plugins(PLUGIN_BECOME_MASTER, NULL); + + // 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()) { - 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"); + 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]); + } + exit(0); } - free(resp); + // add radius fds + for (i = 0; i < config->num_radfds; i++) + { + if (!radfds[i]) continue; + 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) +{ + int s, i; + 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 = 1; s <= config->cluster_highest_sessionid ; ++s) + { + int idle; + if (!session[s].tunnel) + continue; + + idle = time_now - session[s].last_packet; + idle /= 5 ; // In multiples of 5 seconds. + if (idle < 0) + idle = 0; + if (idle > 63) + idle = 63; + + ++count; + ++buckets[idle]; + } + + 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]); + cli_print(cli, "%d total sessions open.", count); + return CLI_OK; +} + +int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc) +{ + int s, i; + 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 = 1; s <= config->cluster_highest_sessionid ; ++s) + { + int open = 0, d; + if (!session[s].tunnel) + continue; + + d = time_now - session[s].opened; + if (d < 0) + d = 0; + while (d > 1 && open < 32) + { + ++open; + d >>= 1; // half. + } + ++count; + ++buckets[open]; + } + + s = 1; + 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. + */ +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, 0, 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; }