// 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 1.45 2004/11/05 07:50:05 bodea Exp $";
+
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <sys/mman.h>
#include <netdb.h>
#include <netinet/in.h>
-#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
-#define __USE_GNU
#include <string.h>
+#include <ctype.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
-#include <sys/types.h>
#include <sys/wait.h>
#include <linux/if.h>
#include <stddef.h>
#include <time.h>
#include <dlfcn.h>
#include <unistd.h>
+#include <sched.h>
+#include <sys/sysinfo.h>
+#include <libcli.h>
+
#include "md5.h"
#include "l2tpns.h"
#include "cluster.h"
#include "constants.h"
#include "control.h"
#include "util.h"
+#include "tbf.h"
// Globals
struct configt *config = NULL; // all configuration
-int tapfd = -1; // tap interface file handle
+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 radfd = -1; // RADIUS requests file handle
+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.
-ipt myip = 0; // MY IP
-u16 tapmac[3]; // MAC of tap interface
-int tapidx; // ifr_ifindex of tap device
+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;
-struct sockaddr_in snoop_addr = {0};
-extern int cluster_sockfd;
-unsigned long last_sid = 0;
-int handle_interface = 0;
-int clifd = 0;
-sessionidt *cli_session_kill = NULL;
-tunnelidt *cli_tunnel_kill = NULL;
-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_size = 0;
-time_t time_now;
-char time_now_string[64] = {0};
-char main_quit = 0;
+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("snoop_host", snoop_destination_host, IP),
- CONFIG("snoop_port", snoop_destination_port, SHORT),
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("cluster_master", cluster_address, IP),
+ CONFIG("peer_address", peer_address, IP),
+ CONFIG("send_garp", send_garp, BOOL),
CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
+ CONFIG("throttle_buckets", num_tbfs, INT),
CONFIG("accounting_dir", accounting_dir, STRING),
CONFIG("setuid", target_uid, INT),
CONFIG("dump_speed", dump_speed, BOOL),
+ CONFIG("cleanup_interval", cleanup_interval, INT),
+ CONFIG("multi_read_count", multi_read_count, INT),
+ CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
+ CONFIG("lock_pages", lock_pages, BOOL),
+ CONFIG("icmp_rate", icmp_rate, INT),
+ CONFIG("cluster_address", cluster_address, IP),
+ CONFIG("cluster_interface", cluster_interface, STRING),
+ 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 },
};
"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;
+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;
}
// 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. Typically called vias LOG macro
+//
void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...)
{
- static char message[65535] = {0};
- static char message2[65535] = {0};
+ static char message[65536] = {0};
+ static char message2[65536] = {0};
va_list ap;
#ifdef RINGBUFFER
{
vsnprintf(message2, 65535, format, ap);
snprintf(message, 65535, "%s %02d/%02d %s", time_now_string, t, s, message2);
- fprintf(log_stream, message);
+ fprintf(log_stream, "%s", message);
}
else if (syslog_log)
{
va_end(ap);
}
-void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize)
+void _log_hex(int level, const char *title, const char *data, int maxsize)
{
int i, j;
- unsigned const char *d = (unsigned const char *)data;
+ const u8 *d = (const u8 *)data;
if (config->debug < level) return;
- // No support for log_hex to syslog
+ // No support for _log_hex to syslog
if (log_stream)
{
- log(level, address, s, t, "%s (%d bytes):\n", title, maxsize);
+ _log(level, 0, 0, 0, "%s (%d bytes):\n", title, maxsize);
setvbuf(log_stream, NULL, _IOFBF, 16384);
for (i = 0; i < maxsize; )
// 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 = config->tapdevice;
+ r.rt_dev = config->tundevice;
r.rt_dst.sa_family = AF_INET;
*(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
r.rt_gateway.sa_family = AF_INET;
*(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 ? 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(config->tapdevice));
- strncpy(config->tapdevice, ifr.ifr_name, sizeof(config->tapdevice) - 1);
+ assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
+ strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = handle_interface ? config->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
addr.sin_family = AF_INET;
addr.sin_port = htons(L2TPPORT);
addr.sin_addr.s_addr = config->bind_address;
- udpfd = socket(AF_INET, SOCK_DGRAM, UDP);
+ udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ {
+ int flags = fcntl(udpfd, F_GETFL, 0);
+ fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
+ }
if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
{
- perror("udp 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));
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 = (unsigned 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 = (unsigned 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;
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 = (unsigned 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 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));
- strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
- 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
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))
- {
- 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)
+ if (!t)
{
- 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)
{
- log(1, 0, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
+ 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;
}
if (tunnel[t].try > 1)
{
STAT(tunnel_retries);
- log(3, tunnel[t].ip, 0, t, "Control message resend try %d\n", tunnel[t].try);
+ LOG(3, tunnel[t].ip, 0, t, "Control message resend try %d\n", tunnel[t].try);
}
}
if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
{
- log(0, tunnel[t].ip, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
+ LOG(0, tunnel[t].ip, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
STAT(tunnel_tx_errors);
return;
}
- log_hex(5, "Send Tunnel Data", buf, l);
+ LOG_HEX(5, "Send Tunnel Data", buf, l);
STAT(tunnel_tx_packets);
INC_STAT(tunnel_tx_bytes, l);
}
+//
+// 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, "Short IP, %d bytes\n", len);
+ LOG(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len);
STAT(tunnel_tx_errors);
return;
}
// Got an IP header now
if (*(u8 *)(buf) >> 4 != 4)
{
- log(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
+ LOG(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
return;
}
ip = *(u32 *)(buf + 16);
if (!(s = sessionbyip(ip)))
{
- 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);
+ // 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);
+
+ // 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;
- log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
+ u8 b[MAXETHER + 20];
- // Plugin hook
+ 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->total_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)
}
// 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
}
}
+//
+// 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)
- log(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
+ 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
}
// 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 (!(r = radiusnew(s)))
{
- log(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
+ LOG(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
STAT(radius_overflow);
}
else
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(s);
+
+ 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 ? myip : session[s].ip); // send my IP (use theirs if I dont have one)
+ *(u32 *) (q + 6) = config->peer_address ? config->peer_address :
+ config->bind_address ? config->bind_address :
+ my_address; // send my IP
+
tunnelsend(buf, 10 + (q - buf), t); // send it
+ session[s].flags &= ~SF_IPCP_ACKED; // Clear flag.
}
// kill a session now
void sessionkill(sessionidt s, char *reason)
{
-#ifdef STAT_CALLS
- STAT(call_sessionkill);
-#endif
+
+ CSTAT(call_sessionkill);
+
+ session[s].die = now();
sessionshutdown(s, reason); // close radius/routes, etc.
if (session[s].radius)
- radiusclear(session[s].radius, 0); // cant send clean accounting data, session is killed
+ 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);
}
{
sessionidt s;
controlt *c;
-#ifdef STAT_CALLS
- STAT(call_tunnelkill);
-#endif
+
+ CSTAT(call_tunnelkill);
tunnel[t].state = TUNNELDIE;
// free tunnel
tunnelclear(t);
+ LOG(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason);
+ cli_tunnel_actions[s].action = 0;
cluster_send_tunnel(t);
- log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason);
- tunnel[t].die = 0;
- tunnel[t].state = TUNNELFREE;
}
// shut down a tunnel cleanly
void tunnelshutdown(tunnelidt t, char *reason)
{
sessionidt s;
-#ifdef STAT_CALLS
- STAT(call_tunnelshutdown);
-#endif
+
+ CSTAT(call_tunnelshutdown);
+
if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
{
// never set up, can immediately kill
tunnelkill(t, reason);
return;
}
- log(1, 0, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
+ LOG(1, 0, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
// close session
for (s = 1; s < MAXSESSION; s++)
u16 l = len, t = 0, s = 0, ns = 0, nr = 0;
u8 *p = buf + 2;
-#ifdef STAT_CALLS
- STAT(call_processudp);
-#endif
+
+ CSTAT(call_processudp);
+
udp_rx += len;
udp_rx_pkt++;
- log_hex(5, "UDP Data", buf, len);
+ LOG_HEX(5, "UDP Data", buf, len);
STAT(tunnel_rx_packets);
INC_STAT(tunnel_rx_bytes, len);
if (len < 6)
{
- log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Short UDP, %d bytes\n", len);
+ LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Short UDP, %d bytes\n", len);
STAT(tunnel_rx_errors);
return;
}
if ((buf[1] & 0x0F) != 2)
{
- log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
+ LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
STAT(tunnel_rx_errors);
return;
}
p += 2;
if (s >= MAXSESSION)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid session ID\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid session ID\n");
STAT(tunnel_rx_errors);
return;
}
if (t >= MAXTUNNEL)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n");
- 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);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n");
STAT(tunnel_rx_errors);
return;
}
}
if ((p - buf) > l)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad length %d>%d\n", (p - buf), l);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad length %d>%d\n", (p - buf), l);
STAT(tunnel_rx_errors);
return;
}
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);
+ 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)
+ {
+ int i;
+
+ //
+ // Is this a duplicate of the first packet? (SCCRQ)
+ //
+ for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
+ {
+ if (tunnel[i].state != TUNNELOPENING ||
+ tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) ||
+ tunnel[i].port != ntohs(addr->sin_port) )
+ continue;
+ t = i;
+ break;
+ }
+ }
+
if (!t)
{
if (!(t = new_tunnel()))
{
- log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
STAT(tunnel_overflow);
return;
}
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);
+ 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
{
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;
}
// receiver advance (do here so quoted correctly in any sends below)
- if (l) tunnel[t].nr++;
+ if (l) tunnel[t].nr = (ns + 1);
if (skip < 0) skip = 0;
if (skip < tunnel[t].controlc)
{
p += n; // next
if (l < n)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Invalid length in AVP\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Invalid length in AVP\n");
STAT(tunnel_rx_errors);
fatal = flags;
return;
// handle hidden AVPs
if (!*config->l2tpsecret)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n");
fatal = flags;
continue;
}
if (!session[s].random_vector_length)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no random vector.\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no random vector.\n");
+ fatal = flags;
+ continue;
+ }
+ 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;
}
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
}
if (*b & 0x3C)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unrecognised AVP flags %02X\n", *b);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unrecognised AVP flags %02X\n", *b);
fatal = flags;
continue; // next
}
b += 2;
if (*(u16 *) (b))
{
- log(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b)));
+ LOG(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b)));
fatal = flags;
continue; // next
}
b += 2;
n -= 6;
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " AVP %d (%s) len %d\n", mtype, avpnames[mtype], n);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " AVP %d (%s) len %d\n", mtype, avpnames[mtype], n);
switch (mtype)
{
case 0: // message type
message = ntohs(*(u16 *) b);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Message type = %d (%s)\n", *b,
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Message type = %d (%s)\n", *b,
l2tp_message_types[message]);
mandatorymessage = flags;
break;
{
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",
+ 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)
errdesc = error_codes[errcode];
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error Code %d: %s\n",
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Error Code %d: %s\n",
errcode, errdesc);
}
- if (n > 4) {
- /* %*s doesn't work?? */
- char *buf = (char *)strndup(b+4, n-4);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %s\n",
- buf);
- free(buf);
- }
+ if (n > 4)
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %.*s\n",
+ n-4, b+4);
+
break;
}
break;
case 2: // protocol version
{
version = ntohs(*(u16 *) (b));
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Protocol version = %d\n", version);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Protocol version = %d\n", version);
if (version && version != 0x0100)
{ // allow 0.0 and 1.0
- log(1, ntohl(addr->sin_addr.s_addr), s, t, " Bad protocol version %04X\n",
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, " Bad protocol version %04X\n",
version);
fatal = flags;
continue; // next
}
break;
case 3: // framing capabilities
-// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
+// LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
break;
case 4: // bearer capabilities
-// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
+// LOG(4, 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
-// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
+// LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
continue;
case 6: // firmware revision
-// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
+// LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
break;
case 7: // host name
memset(tunnel[t].hostname, 0, 128);
memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
// TBA - to send to RADIUS
break;
case 8: // vendor name
- memset(tunnel[t].vendor, 0, 128);
- memcpy(tunnel[t].vendor, b, (n >= 127) ? 127 : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
+ memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
+ memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
break;
case 9: // assigned tunnel
tunnel[t].far = ntohs(*(u16 *) (b));
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Remote tunnel id = %d\n", tunnel[t].far);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Remote tunnel id = %d\n", tunnel[t].far);
break;
case 10: // rx window
tunnel[t].window = ntohs(*(u16 *) (b));
if (!tunnel[t].window)
tunnel[t].window = 1; // window of 0 is silly
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " rx window = %d\n", tunnel[t].window);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " rx window = %d\n", tunnel[t].window);
break;
case 11: // Challenge
{
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " LAC requested CHAP authentication for tunnel\n");
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " LAC requested CHAP authentication for tunnel\n");
build_chap_response(b, 2, n, &chapresponse);
}
break;
+ case 13: // Response
+ // Why did they send a response? We never challenge.
+ LOG(2, 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);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " assigned session = %d\n", asession);
break;
case 15: // call serial number
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " call serial number = %d\n", ntohl(*(u32 *)b));
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " call serial number = %d\n", ntohl(*(u32 *)b));
break;
case 18: // bearer type
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " bearer type = %d\n", ntohl(*(u32 *)b));
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " bearer type = %d\n", ntohl(*(u32 *)b));
// TBA - for RADIUS
break;
case 19: // framing type
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " framing type = %d\n", ntohl(*(u32 *)b));
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " framing type = %d\n", ntohl(*(u32 *)b));
// TBA
break;
case 21: // called number
memset(called, 0, MAXTEL);
memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Called <%s>\n", called);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Called <%s>\n", called);
break;
case 22: // calling number
memset(calling, 0, MAXTEL);
memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Calling <%s>\n", calling);
+ LOG(4, 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)
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
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
{
u32 tmp = ntohl(*(u32 *)b);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Physical Channel ID <%X>\n", tmp);
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Physical Channel ID <%X>\n", tmp);
break;
}
case 29: // Proxy Authentication Type
{
u16 authtype = ntohs(*(u16 *)b);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Type %d (%s)\n",
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Type %d (%s)\n",
authtype, authtypes[authtype]);
requestchap = (authtype == 2);
break;
{
char authname[64] = {0};
memcpy(authname, b, (n > 63) ? 63 : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Name (%s)\n",
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Name (%s)\n",
authname);
break;
}
case 31: // Proxy Authentication Challenge
{
memcpy(radius[session[s].radius].auth, b, 16);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Challenge (%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
{
u16 authid = ntohs(*(u16 *)(b));
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth ID (%d)\n",
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth ID (%d)\n",
authid);
if (session[s].radius)
radius[session[s].radius].id = authid;
{
char authresp[64] = {0};
memcpy(authresp, b, (n > 63) ? 63 : n);
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Response\n");
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Response\n");
break;
}
case 27: // last send lcp
{ // find magic number
u8 *p = b, *e = p + n;
- while (p < e && p[1])
+ while (p + 1 < e && p[1] && p + p[1] <= e)
{
- if (*p == 5 && p[1] == 6)
+ if (*p == 5 && p[1] == 6) // Magic-Number
amagic = ntohl(*(u32 *) (p + 2));
- else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5)
+ else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol
chap = 1;
- else if (*p == 7)
+ else if (*p == 7) // Protocol-Field-Compression
aflags |= SESSIONPFC;
- else if (*p == 8)
+ else if (*p == 8) // Address-and-Control-Field-Compression
aflags |= SESSIONACFC;
p += p[1];
}
-
- {
- char tmp[500] = {0};
- tmp[0] = ConfigReq;
- memcpy((tmp + 1), b, n);
- }
}
break;
case 28: // last recv lcp confreq
- {
- char tmp[500] = {0};
- tmp[0] = ConfigReq;
- memcpy((tmp + 1), b, n);
- break;
- }
+ break;
case 26: // Initial Received LCP CONFREQ
- {
- char tmp[500] = {0};
- tmp[0] = ConfigReq;
- memcpy((tmp + 1), b, n);
- }
break;
case 39: // seq required - we control it as an LNS anyway...
break;
case 36: // Random Vector
- log(4, ntohl(addr->sin_addr.s_addr), s, t, " Random Vector received. Enabled AVP Hiding.\n");
+ LOG(4, ntohl(addr->sin_addr.s_addr), s, t, " Random Vector received. Enabled AVP Hiding.\n");
memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
memcpy(session[s].random_vector, b, n);
session[s].random_vector_length = n;
break;
default:
- log(2, ntohl(addr->sin_addr.s_addr), s, t, " Unknown AVP type %d\n", mtype);
+ LOG(2, ntohl(addr->sin_addr.s_addr), s, t, " Unknown AVP type %d\n", mtype);
fatal = flags;
continue; // next
}
}
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 (!(r = radiusnew(s)))
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n");
sessionkill(s, "no free RADIUS sesions");
return;
}
session[s].tunnel = t;
session[s].far = asession;
session[s].last_packet = time_now;
- log(3, ntohl(addr->sin_addr.s_addr), s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
+ LOG(3, 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
{
// 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
- log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags);
+ 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
if (requestchap)
sessionshutdown(s, "Closed (Received CDN)");
break;
case 0xFFFF:
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Missing message type\n");
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Missing message type\n");
break;
default:
STAT(tunnel_rx_errors);
if (mandatorymessage & 0x80)
tunnelshutdown(t, "Unknown message");
else
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown message type %d\n", message);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown message type %d\n", message);
break;
}
if (chapresponse) free(chapresponse);
}
else
{
- log(4, 0, s, t, " Got a ZLB ack\n");
+ LOG(4, 0, s, t, " Got a ZLB ack\n");
}
}
else
{ // data
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
- }
+ LOG_HEX(5, "Receive Tunnel Data", p, l);
if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
{ // HDLC address header, discard
p += 2;
}
if (l < 2)
{
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Short ppp length %d\n", l);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Short ppp length %d\n", l);
STAT(tunnel_rx_errors);
return;
}
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 (session[s].walled_garden && !config->cluster_iam_master)
+ {
+ master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+ return;
+ }
processipin(t, s, p, l);
}
else
{
STAT(tunnel_rx_errors);
- log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot);
+ LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot);
}
}
}
-// read and process packet on tap
-void processtap(u8 * buf, int len)
+// read and process packet on tun
+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);
- FD_SET(clifd, &cr);
- 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;
- if (cn < clifd) cn = clifd;
- if (cn < cluster_sockfd) cn = cluster_sockfd;
-
- while (!main_quit)
- {
- fd_set r;
- int n = cn;
+ 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;
- if (config->reload_config)
+ LOG(3, 0, 0, 0, "Begin regular cleanup\n");
+
+ for (r = 1; r < MAXRADIUS; r++)
+ {
+ if (!radius[r].state)
+ continue;
+ if (radius[r].retry)
{
- // Update the config state based on config settings
- update_config();
+ 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;
}
-
- memcpy(&r, &cr, sizeof(fd_set));
- n = select(n + 1, &r, 0, 0, &to);
- if (n < 0)
+ // check for message resend
+ if (tunnel[t].retry && tunnel[t].controlc)
{
- if (errno != EINTR)
+ // resend pending messages as timeout on reply
+ if (tunnel[t].retry <= TIME)
{
- perror("select");
- exit( -1);
+ 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;
+ }
}
}
- else if (n)
+ // Send hello
+ if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
{
- 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);
- else if (FD_ISSET(clifd, &r))
- {
- struct sockaddr_in addr;
- int sockfd;
- int len = sizeof(addr);
+ controlt *c = controlnew(6); // sending HELLO
+ controladd(c, t, 0); // send the message
+ LOG(3, tunnel[t].ip, 0, t, "Sending HELLO message\n");
+ }
- 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);
- }
+ // 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)
+ {
+ LOG(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n");
+ tunnelshutdown(t, "Requested by administrator");
}
- else
+ }
+
+ }
+
+ 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)
{
- log(1, 0, 0, 0, "Main select() loop returned %d, but no fds have data waiting\n", n);
+ LOG(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
continue;
}
+
+ *q = EchoReq;
+ *(u8 *)(q + 1) = (time_now % 255); // ID
+ *(u16 *)(q + 2) = htons(8); // Length
+ *(u32 *)(q + 4) = 0; // Magic Number (not supported)
+
+ LOG(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
+ (int)(time_now - session[s].last_packet));
+ tunnelsend(b, 24, session[s].tunnel); // send it
+ if (++count >= MAX_ACTIONS) break;
}
- else if (n == 0) { // handle timeouts
- clockt when = now();
- clockt best = when + 100; // default timeout
- sessionidt s;
- tunnelidt t;
- u8 r;
- for (r = 1; 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 = 1; t < MAXTUNNEL; t++)
+ // Check for actions requested from the CLI
+ if ((a = cli_session_actions[s].action))
+ {
+ int send = 0;
+
+ cli_session_actions[s].action = 0;
+ if (a & CLI_SESS_KILL)
{
- // 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)
- {
- 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;
- }
- }
- if (tunnel[t].retry && tunnel[t].retry < best)
- best = tunnel[t].retry;
- }
- // Send hello
- if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < when + 600)
- {
- controlt *c = controlnew(6); // sending HELLO
- controladd(c, t, 0); // send the message
- log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n");
- }
+ LOG(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
}
- // Check for sessions that have been killed from the CLI
- if (cli_session_kill[0])
+ if (a & CLI_SESS_NOSNOOP)
{
- int i;
- for (i = 1; i < MAXSESSION && cli_session_kill[i]; i++)
- {
- log(2, 0, cli_session_kill[i], 0, "Dropping session by CLI\n");
- sessionshutdown(cli_session_kill[i], "Requested by administrator");
- cli_session_kill[i] = 0;
- }
+ LOG(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n");
+ session[s].snoop_ip = 0;
+ session[s].snoop_port = 0;
+ send++;
}
- // Check for tunnels that have been killed from the CLI
- if (cli_tunnel_kill[0])
+ else if (a & CLI_SESS_SNOOP)
{
- int i;
- for (i = 1; 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 administrator");
- cli_tunnel_kill[i] = 0;
- }
+ 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++;
}
- for (s = 1; s < MAXSESSION; s++)
+ if (a & CLI_SESS_NOTHROTTLE)
{
- // check for expired sessions
- if (session[s].die && session[s].die <= when)
- {
- sessionkill(s, "Expired");
- 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);
- 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, 0, 0, session[s].tunnel, s, PPPLCP);
-
- *q = EchoReq;
- *(u8 *)(q + 1) = (time_now % 255); // ID
- *(u16 *)(q + 2) = htons(8); // Length
- *(u32 *)(q + 4) = 0; // Magic Number (not supported)
-
- log(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
- time_now - session[s].last_packet);
- tunnelsend(b, 24, session[s].tunnel); // send it
- continue;
- }
+ LOG(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n");
+ throttle_session(s, 0, 0);
+ send++;
}
- if (config->accounting_dir && next_acct <= when)
+ else if (a & CLI_SESS_THROTTLE)
{
- // Dump accounting data
- next_acct = when + ACCT_TIME;
- dump_acct_info();
- }
+ 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);
- if (cluster_sockfd && next_cluster_ping <= when)
- {
- // Dump accounting data
- next_cluster_ping = when + 50;
- cluster_send_message(config->cluster_address, config->bind_address, C_PING, hostname, strlen(hostname));
+ 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 == MAP_FAILED)
- {
- log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno));
- exit(1);
- }
- config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (config == MAP_FAILED)
- {
- log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno));
- exit(1);
- }
- memset(config, 0, sizeof(struct configt));
- time(&config->start_time);
- strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1);
- tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (tunnel == MAP_FAILED)
- {
- 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 == MAP_FAILED)
- {
- 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 == MAP_FAILED)
- {
- 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 == MAP_FAILED)
- {
- 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 == MAP_FAILED)
+ for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
{
- 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;
- cli_session_kill = mmap(NULL, sizeof(sessionidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (cli_session_kill == MAP_FAILED)
- {
- log(0, 0, 0, 0, "Error doing mmap for cli session kill: %s\n", strerror(errno));
- exit(1);
- }
- memset(cli_session_kill, 0, sizeof(sessionidt) * MAXSESSION);
- cli_tunnel_kill = mmap(NULL, sizeof(tunnelidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
- if (cli_tunnel_kill == MAP_FAILED)
- {
- log(0, 0, 0, 0, "Error doing mmap for cli tunnel 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_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 == MAP_FAILED)
+ // 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 filter buckets: %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(filter_buckets, 0, sizeof(tbft) * 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 < MAXSESSION - 1; i++)
- session[i].next = i + 1;
- session[MAXSESSION - 1].next = 0;
- sessionfree = 1;
- if (!*hostname)
+ for (i = 1; i < MAXRADIUS; i++)
{
- char *p;
- // Grab my hostname unless it's been specified
- gethostname(hostname, sizeof(hostname));
+ if (radius[i].state == RADIUSNULL)
+ continue;
+ if (radius[i].state == RADIUSWAIT)
+ continue;
+
+ if (last_talked != TIME)
{
- struct hostent *h = gethostbyname(hostname);
- if (h)
- myip = ntohl(*(u32 *) h->h_addr);
+ LOG(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
+ last_talked = TIME;
}
-
- if ((p = strstr(hostname, ".optusnet.com.au"))) *p = 0;
+ return 1;
}
- _statistics->start_time = _statistics->last_reset = time(NULL);
-}
-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");
+ return 0;
}
-int assign_ip_address(sessionidt s)
-{
- unsigned i;
- int best = -1;
- clockt best_time = time_now;
- char *u = session[s].user;
- char reuse = 0;
+static fd_set readset;
+static int readset_n = 0;
-#ifdef STAT_CALLS
- STAT(call_assign_ip_address);
-#endif
- for (i = 0; i < ip_pool_size; i++)
+// 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())
{
- if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
- continue;
+ fd_set r;
+ int n = readset_n;
+#ifdef BGP
+ fd_set w;
+ int bgp_set[BGP_NUM_PEERS];
+#endif /* BGP */
- if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
+ if (config->reload_config)
{
- best = i;
- reuse = 1;
+ // 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!
+}
+
+static void stripdomain(char *host)
+{
+ char *p;
+
+ if ((p = strchr(host, '.')))
+ {
+ char *domain = 0;
+ char _domain[1024];
+
+ // strip off domain
+ FILE *resolv = fopen("/etc/resolv.conf", "r");
+ if (resolv)
+ {
+ char buf[1024];
+ char *b;
+
+ while (fgets(buf, sizeof(buf), resolv))
+ {
+ if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
+ continue;
+
+ if (!isspace(buf[6]))
+ continue;
+
+ b = buf + 7;
+ while (isspace(*b)) b++;
+
+ if (*b)
+ {
+ char *d = b;
+ while (*b && !isspace(*b)) b++;
+ *b = 0;
+ if (buf[0] == 'd') // domain is canonical
+ {
+ domain = d;
+ break;
+ }
+
+ // first search line
+ if (!domain)
+ {
+ // hold, may be subsequent domain line
+ strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
+ domain = _domain;
+ }
+ }
+ }
+
+ fclose(resolv);
+ }
+
+ if (domain)
+ {
+ int hl = strlen(host);
+ int dl = strlen(domain);
+ if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
+ host[hl -dl - 1] = 0;
+ }
+ else
+ {
+ *p = 0; // everything after first dot
+ }
+ }
+}
+
+// Init data structures
+void initdata(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);
+
+ // 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;
+
+ // 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)
+ {
+ // Grab my hostname unless it's been specified
+ gethostname(hostname, sizeof(hostname));
+ stripdomain(hostname);
+ }
+
+ _statistics->start_time = _statistics->last_reset = time(NULL);
+
+#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 */
+
+// Not needed. 'nat' is setup by garden.c
+// mangle isn't used (as throttling is done by tbf inhouse).
+}
+
+int assign_ip_address(sessionidt s)
+{
+ 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_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))
+ {
+ best = i;
+ reuse = 1;
break;
}
if (best < 0)
{
- log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
+ LOG(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
return 0;
}
- session[s].ip = ntohl(ip_address_pool[best].address);
+ 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
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 %lu from pool\n", reuse ? "Reusing" : "Allocating", best);
+ 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;
}
{
int i = session[s].ip_pool_index;
-#ifdef STAT_CALLS
- STAT(call_free_ip_address);
-#endif
-
if (!session[s].ip)
return; // what the?
+ if (i < 0) // Is this actually part of the ip pool?
+ i = 0;
+
STAT(ip_freed);
- uncache_sessionid(session[s].ip);
+ 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;
+
+ //
+ // Zero the IP pool allocation, and build
+ // a map from IP address to pool index.
+ for (i = 1; i < MAXIPPOOL; ++i)
+ {
+ 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)
+ {
+ // 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;
+ }
+ }
}
// 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);
+ LOG(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
+ 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;
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 != config->bind_address)
{
// 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);
+ 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 = config->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;
- 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));
+ 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));
+ LOG(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
STAT(packets_snooped);
}
void dump_acct_info()
{
- char filename[1024];
- char timestr[64];
- time_t t = time(NULL);
- int i;
- FILE *f = NULL;
+ char filename[1024];
+ char timestr[64];
+ time_t t = time(NULL);
+ int i;
+ FILE *f = NULL;
-#ifdef STAT_CALLS
- STAT(call_dump_acct_info);
-#endif
- strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t));
- snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr);
- for (i = 0; i < MAXSESSION; i++)
- {
- if (!session[i].opened || !session[i].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:h:a:")) >= 0)
+ // scan args
+ while ((o = getopt(argc, argv, "dvc:h:")) >= 0)
{
switch (o)
{
+ case 'd':
+ if (fork()) exit(0);
+ setsid();
+ freopen("/dev/null", "r", stdin);
+ freopen("/dev/null", "w", stdout);
+ freopen("/dev/null", "w", stderr);
+ break;
case 'v':
- config->debug++;
+ optdebug++;
break;
case 'c':
- strncpy(config->config_file, optarg, sizeof(config->config_file) - 1);
+ optconfig = optarg;
break;
case 'h':
- strncpy(hostname, optarg, 999);
- break;
- case 'a':
- myip = inet_addr(optarg);
- if (myip == INADDR_NONE) {
- log(0, 0, 0, 0, "Invalid ip %s\n", optarg);
- exit(-1);
- }
- config->bind_address = myip;
- handle_interface = 1;
+ snprintf(hostname, sizeof(hostname), "%s", optarg);
break;
- case '?':
default:
- printf("Args are:\n\t-c <file>\tConfig file\n\t-h <hostname>\tForce hostname\n\t-a <address>\tUse specific address\n\t-v\t\tDebug\n");
+ printf("Args are:\n"
+ "\t-d\tDetach from terminal\n"
+ "\t-c <file>\tConfig file\n"
+ "\t-h <hostname>\tForce hostname\n"
+ "\t-a <address>\tUse specific address\n"
+ "\t-v\t\tDebug\n");
+
return (0);
break;
}
// Start the timer routine off
time(&time_now);
- strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+ strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+ signal(SIGALRM, sigalrm_handler);
+ siginterrupt(SIGALRM, 0);
initiptables();
initplugins();
- initdata();
- init_cli();
+ initdata(optdebug, optconfig);
+
+ init_cli(hostname);
read_config_file();
- log(1, 0, 0, 0, "L2TPNS Version 1.1.0 - http://l2tpns.sourceforge.net/\n");
- log(1, 0, 0, 0, "Licensed under the GPL\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(config->bind_address, 0);
- cluster_send_message(config->cluster_address, config->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;
+ }
+ }
+ }
+
+ /* Set up the cluster communications port. */
+ if (cluster_init(config->bind_address) < 0)
+ exit(1);
- inittap();
- log(1, 0, 0, 0, "Set up on interface %s\n", config->tapdevice);
+#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(config->bind_address);
- }
-
- // If NOSTATEFILE exists, we will ignore any updates from the cluster master for this execution
- if (!unlink(NOSTATEFILE))
- config->ignore_cluster_updates = 1;
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);
+
+ // Prevent us from getting paged out
+ if (config->lock_pages)
+ {
+ 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);
setuid(config->target_uid);
mainloop();
+
+#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;
}
// Log current traffic stats
snprintf(config->bandwidth, sizeof(config->bandwidth),
- "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%lu OUT:%lu",
+ "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),
// 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);
{
void sigterm_handler(int junk)
{
- log(1, 0, 0, 0, "Shutting down cleanly\n");
+ LOG(1, 0, 0, 0, "Shutting down cleanly\n");
if (config->save_state)
dump_state();
+
main_quit++;
}
void sigquit_handler(int junk)
{
- FILE *f;
int i;
- log(1, 0, 0, 0, "Shutting down without saving sessions\n");
+ LOG(1, 0, 0, 0, "Shutting down without saving sessions\n");
for (i = 1; i < MAXSESSION; i++)
{
if (session[i].opened)
tunnelshutdown(i, "L2TPNS Closing");
}
- cluster_send_goodbye();
-
- // Touch a file which says not to reload the state
- f = fopen(NOSTATEFILE, "w");
- if (f) fclose(f);
-
main_quit++;
}
;
}
-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);
-}
+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)
+ {
+ unlink(STATEFILE);
+ return ;
+ }
+
+ if (stat(STATEFILE, &sb) < 0)
+ {
+ unlink(STATEFILE);
+ return ;
+ }
+
+ if (sb.st_mtime < (time(NULL) - 60))
+ {
+ LOG(0, 0, 0, 0, "State file is too old to read, ignoring\n");
+ unlink(STATEFILE);
+ return ;
+ }
+
+ f = fopen(STATEFILE, "r");
+ unlink(STATEFILE);
+
+ if (!f)
+ {
+ LOG(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ if (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);
+ }
+
+ LOG(1, 0, 0, 0, "Reading state information\n");
+ if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
+ {
+ LOG(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
+ exit(1);
+ }
+
+ 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++)
+ {
+ if (fread(&itmp, sizeof(itmp), 1, f) != 1)
+ {
+ LOG(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
+ exit(1);
+ }
+
+ if (itmp.address != ip_address_pool[i].address)
+ {
+ LOG(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
+ exit(1);
+ }
+
+ memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
+ }
+
+ if (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);
+ }
-void read_state()
-{
- struct stat sb;
- int i;
- ippoolt itmp;
- FILE *f;
- char magic[sizeof(DUMP_MAGIC)-1];
- u32 buf[2];
+ 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);
+ }
- if (!config->save_state)
- return;
+ 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);
+ }
- // Ignore saved state if NOSTATEFILE exists
- if (config->ignore_cluster_updates)
- {
- unlink(STATEFILE);
- return;
- }
+ if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
+ {
+ LOG(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
+ exit(1);
+ }
- if (stat(STATEFILE, &sb) < 0)
- return;
+ 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);
+ }
- if (sb.st_mtime < (time(NULL) - 60))
- {
- log(0, 0, 0, 0, "State file is too old to read, ignoring\n");
- unlink(STATEFILE);
- return;
- }
-
- f = fopen(STATEFILE, "r");
- unlink(STATEFILE);
-
- if (!f)
- {
- log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
- exit(1);
- }
-
- if (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);
- }
-
- log(1, 0, 0, 0, "Reading state information\n");
- if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
- {
- log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
- exit(1);
- }
-
- 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++)
- {
- if (fread(&itmp, sizeof(itmp), 1, f) != 1)
- {
- log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
- exit(1);
- }
-
- if (itmp.address != ip_address_pool[i].address)
- {
- log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
- exit(1);
- }
-
- memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
- }
-
- if (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 = 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)
- sessionsetup(session[i].tunnel, i, 0);
- }
- }
-
- fclose(f);
- log(0, 0, 0, 0, "Loaded saved state information\n");
+ for (i = 0; i < MAXSESSION; i++)
+ {
+ session[i].tbf_in = 0;
+ session[i].tbf_out = 0;
+ if (session[i].opened)
+ {
+ LOG(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user);
+ if (session[i].ip)
+ sessionsetup(session[i].tunnel, i);
+ }
+ }
+
+ fclose(f);
+ LOG(0, 0, 0, 0, "Loaded saved state information\n");
}
void dump_state()
{
- FILE *f;
- u32 buf[2];
+ FILE *f;
+ u32 buf[2];
- if (!config->save_state)
- return;
+ if (!config->save_state)
+ return;
- do {
- if (!(f = fopen(STATEFILE, "w")))
- break;
+ do
+ {
+ if (!(f = fopen(STATEFILE, "w")))
+ break;
- log(1, 0, 0, 0, "Dumping state information\n");
+ LOG(1, 0, 0, 0, "Dumping state information\n");
- if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC)-1, 1, f) != 1) break;
+ if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1)
+ break;
- log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
- buf[0] = ip_pool_size;
- buf[1] = sizeof(ippoolt);
- if (fwrite(buf, sizeof(buf), 1, f) != 1) break;
- if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size) break;
+ LOG(2, 0, 0, 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 tunnels\n", MAXTUNNEL);
+ buf[0] = MAXTUNNEL;
+ buf[1] = sizeof(tunnelt);
+ if (fwrite(buf, sizeof(buf), 1, f) != 1)
+ break;
+ if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
+ break;
- log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
- buf[0] = MAXSESSION;
- buf[1] = sizeof(sessiont);
- if (fwrite(buf, sizeof(buf), 1, f) != 1) break;
- if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) break;
+ LOG(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
+ buf[0] = MAXSESSION;
+ buf[1] = sizeof(sessiont);
+ if (fwrite(buf, sizeof(buf), 1, f) != 1)
+ break;
+ if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
+ break;
- if (fclose(f) == 0) return; // OK
- } while (0);
+ if (fclose(f) == 0)
+ return ; // OK
+ }
+ while (0);
- log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno));
- unlink(STATEFILE);
+ LOG(0, 0, 0, 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)
if (!*config->l2tpsecret)
{
- log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\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");
+ LOG(4, 0, 0, 0, " Building challenge response for CHAP request\n");
*challenge_response = (char *)calloc(17, 1);
static int facility_value(char *name)
{
- int i;
- for (i = 0; facilitynames[i].c_name; i++)
- {
- if (strcmp(facilitynames[i].c_name, name) == 0)
- return facilitynames[i].c_val;
- }
- return 0;
+ int i;
+ for (i = 0; facilitynames[i].c_name; i++)
+ {
+ if (strcmp(facilitynames[i].c_name, name) == 0)
+ return facilitynames[i].c_val;
+ }
+ return 0;
}
void update_config()
{
int i;
-
- snoop_addr.sin_family = AF_INET;
- snoop_addr.sin_addr.s_addr = config->snoop_destination_host;
- snoop_addr.sin_port = htons(config->snoop_destination_port);
+ static int timeout = 0;
+ static int interval = 0;
// Update logging
closelog();
}
if (*config->log_filename)
{
- if (strstr(config->log_filename, "file:") == config->log_filename)
+ 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 + 5), "a")))
+ if ((log_stream = fopen((char *)(config->log_filename), "a")))
{
fseek(log_stream, 0, SEEK_END);
setbuf(log_stream, NULL);
setbuf(log_stream, NULL);
}
}
- else 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
{
// Update radius
config->numradiusservers = 0;
for (i = 0; i < MAXRADSERVER; i++)
- if (config->radiusserver[i]) config->numradiusservers++;
+ if (config->radiusserver[i])
+ {
+ config->numradiusservers++;
+ // Set radius port: if not set, take the port from the
+ // first radius server. For the first radius server,
+ // take the #defined default value from l2tpns.h
+
+ // test twice, In case someone works with
+ // a secondary radius server without defining
+ // a primary one, this will work even then.
+ if (i>0 && !config->radiusport[i])
+ config->radiusport[i] = config->radiusport[i-1];
+ if (!config->radiusport[i])
+ config->radiusport[i] = RADPORT;
+ }
if (!config->numradiusservers)
{
- log(0, 0, 0, 0, "No RADIUS servers defined!\n");
+ LOG(0, 0, 0, 0, "No RADIUS servers defined!\n");
}
+ config->num_radfds = 2 << RADIUS_SHIFT;
+
// Update plugins
for (i = 0; i < MAXPLUGINS; 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);
+
+ if (!config->cluster_hb_interval)
+ config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
+
+ if (!config->cluster_hb_timeout)
+ config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
+
+ if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
+ {
+ // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
+ // late, ensure we're sufficiently larger than that
+ int t = 4 * config->cluster_hb_interval + 11;
+
+ if (config->cluster_hb_timeout < t)
+ {
+ LOG(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
+ config->cluster_hb_timeout = t;
+ }
+
+ // Push timing changes to the slaves immediately if we're the master
+ if (config->cluster_iam_master)
+ cluster_heartbeat();
+
+ interval = config->cluster_hb_interval;
+ timeout = config->cluster_hb_timeout;
+ }
+
+ // Write PID file
+ if (*config->pid_file == '/' && !config->wrote_pid)
+ {
+ FILE *f;
+ if ((f = fopen(config->pid_file, "w")))
+ {
+ fprintf(f, "%d\n", getpid());
+ fclose(f);
+ config->wrote_pid = 1;
+ }
+ else
+ {
+ LOG(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
+ }
+ }
+
config->reload_config = 0;
}
FILE *f;
if (!config->config_file) return;
- if (!(f = fopen(config->config_file, "r"))) {
+ if (!(f = fopen(config->config_file, "r")))
+ {
fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
return;
}
- log(3, 0, 0, 0, "Reading config file %s\n", config->config_file);
+ LOG(3, 0, 0, 0, "Reading config file %s\n", config->config_file);
cli_do_file(f);
- log(3, 0, 0, 0, "Done reading config file\n");
+ LOG(3, 0, 0, 0, "Done reading config file\n");
fclose(f);
update_config();
- log_stream = NULL;
}
-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
- 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;
+ int r;
+
+ CSTAT(call_sessionsetup);
+
+ LOG(3, session[s].ip, s, t, "Doing session setup for session\n");
+
+ if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
+ {
+ assign_ip_address(s);
+ if (!session[s].ip)
+ {
+ LOG(0, 0, s, t, " No IP allocated. The IP address pool is FULL!\n");
+ sessionshutdown(s, "No IP addresses available");
+ return 0;
+ }
+ LOG(3, 0, s, t, " No IP allocated. Assigned %s from pool\n",
+ inet_toa(htonl(session[s].ip)));
}
+
// 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 = 1; 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);
}
- if (!session[s].sid)
- 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)));
- log(2, session[s].ip, s, t, "Login by %s at %s from %s (%s)\n",
+ 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)
{
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());
+ LOG(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
return;
}
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]);
+ 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);
+
+ 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);
+ LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
}
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 ");
- if (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);
param.response = resp;
param.response_length = l;
- if (param.type == PKT_LOAD_PLUGIN && param.data_length)
- {
- add_plugin(param.data);
- }
- else if (param.type == PKT_UNLOAD_PLUGIN && param.data_length)
- {
- remove_plugin(param.data);
- }
- else
- {
- run_plugins(PLUGIN_CONTROL, ¶m);
- }
+ run_plugins(PLUGIN_CONTROL, ¶m);
if (param.send_response)
{
send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length);
- log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n");
+ LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n");
}
free(resp);
{
int i;
- log(1, 0, 0, 0, "Cleaning tunnels array\n");
+ LOG(1, 0, 0, 0, "Cleaning tunnels array\n");
for (i = 1; i < MAXTUNNEL; i++)
{
{
if (tunnel[i].state == TUNNELFREE)
{
- log(4, 0, 0, i, "Assigning tunnel ID %d\n", i);
+ LOG(4, 0, 0, i, "Assigning tunnel ID %d\n", i);
+ if (i > config->cluster_highest_tunnelid)
+ config->cluster_highest_tunnelid = i;
return i;
}
}
- log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
+ LOG(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
return 0;
}
+//
+// 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())
+ {
+ 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);
+ }
+
+ // 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;
+}
+
projects / l2tpns.git / blobdiff