X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/abbc5c5fcef36f53fe0367d4f0877c1f3c05ff90..0ac369f08301c60f499cc88b07a7238c2576b3aa:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index 52a813d..a83b57d 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -4,7 +4,7 @@ // 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 1.23 2004-08-26 04:43:52 fred_nerk Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.41 2004-11-04 06:05:55 bodea Exp $"; #include #include @@ -23,6 +23,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.23 2004-08-26 04:43:52 fred_nerk #include #include #include +#include #include #include #include @@ -63,7 +64,7 @@ u32 sessionid = 0; // session id for radius accounting int syslog_log = 0; // are we logging to syslog FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog). extern int cluster_sockfd; // Intra-cluster communications socket. -u32 last_sid = 0; // Last used PPP SID. Can I kill this?? -- mo +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 @@ -101,13 +102,14 @@ struct config_descriptt config_values[] = { CONFIG("save_state", save_state, BOOL), CONFIG("primary_radius", radiusserver[0], IP), CONFIG("secondary_radius", radiusserver[1], IP), - CONFIG("primary_radius_port",radiusport[0], SHORT), - CONFIG("secondary_radius_port",radiusport[1], SHORT), + CONFIG("primary_radius_port", radiusport[0], SHORT), + CONFIG("secondary_radius_port", radiusport[1], SHORT), CONFIG("radius_accounting", radius_accounting, BOOL), CONFIG("radius_secret", radiussecret, STRING), CONFIG("bind_address", bind_address, IP), CONFIG("send_garp", send_garp, BOOL), CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG), + CONFIG("throttle_buckets", num_tbfs, INT), CONFIG("accounting_dir", accounting_dir, STRING), CONFIG("setuid", target_uid, INT), CONFIG("dump_speed", dump_speed, BOOL), @@ -169,6 +171,7 @@ void dump_state(); void tunnel_clean(); tunnelidt new_tunnel(); void update_config(); +int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length); static void cache_ipmap(ipt ip, int s); static void uncache_ipmap(ipt ip); @@ -237,7 +240,7 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, va_end(ap); } -void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize) +void _log_hex(int level, const char *title, const char *data, int maxsize) { int i, j; const u8 *d = (const u8 *)data; @@ -247,7 +250,7 @@ void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *tit // 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; ) @@ -965,62 +968,48 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) // // Throttle or Unthrottle a session // -// Throttle the data folling through a session -// to be no more than 'throttle' kbit/sec each way. +// Throttle the data from/to through a session to no more than +// 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to +// user). // -int throttle_session(sessionidt s, int throttle) +// 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 0; // No-one home. + return; // No-one home. if (!*session[s].user) - return 0; // User not logged in + return; // User not logged in - if (throttle) + if (rate_in >= 0) { - if (session[s].tbf_in || session[s].tbf_out) - { - if (throttle == session[s].throttle) - return 1; - - // Currently throttled but the rate is changing. - + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) free_tbf(session[s].tbf_in); - free_tbf(session[s].tbf_out); - } - - session[s].tbf_in = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipin); - session[s].tbf_out = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipout); - if (throttle != session[s].throttle) - { - // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); - } + if (rate_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; - return 1; + session[s].throttle_in = rate_in; } - // else Unthrottling. - - if (!session[s].tbf_in && !session[s].tbf_out && !session[s].throttle) - return 0; - - free_tbf(session[s].tbf_in); - session[s].tbf_in = 0; + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) + free_tbf(session[s].tbf_out); - free_tbf(session[s].tbf_out); - session[s].tbf_out = 0; + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; - if (throttle != session[s].throttle) - { - // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); + session[s].throttle_out = rate_out; } - - return 0; } // start tidy shutdown of session @@ -1086,16 +1075,18 @@ void sessionshutdown(sessionidt s, char *reason) } else free_ip_address(s); - - if (session[s].throttle) // Unthrottle if throttled. - throttle_session(s, 0); } + + if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled. + throttle_session(s, 0, 0); + { // Send CDN controlt *c = controlnew(14); // sending CDN control16(c, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message control16(c, 14, s, 1); // assigned session (our end) controladd(c, session[s].tunnel, s); // send the message } + cluster_send_session(s); } @@ -1154,8 +1145,6 @@ void sessionkill(sessionidt s, char *reason) log(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason); - throttle_session(s, 0); // Force session to be un-throttle. Free'ing TBF structures. - memset(&session[s], 0, sizeof(session[s])); session[s].tunnel = T_FREE; // Mark it as free. session[s].next = sessionfree; @@ -1449,6 +1438,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) 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; + } } if (*b & 0x3C) { @@ -1563,6 +1559,11 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) build_chap_response(b, 2, n, &chapresponse); } break; + case 13: // Response + // Why did they send a response? We never challenge. + log(2, ntohl(addr->sin_addr.s_addr), s, t, " received unexpected challenge response\n"); + break; + case 14: // assigned session asession = session[s].far = ntohs(*(u16 *) (b)); log(4, ntohl(addr->sin_addr.s_addr), s, t, " assigned session = %d\n", asession); @@ -1808,7 +1809,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // TBA break; case 12: // ICCN - if ( amagic == 0) amagic = time_now; + if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number session[s].l2tp_flags = aflags; // set flags received log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags); @@ -1923,27 +1924,12 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else if (prot == PPPIP) { - if (!config->cluster_iam_master) + session[s].last_packet = time_now; + if (session[s].walled_garden && !config->cluster_iam_master) { - // We're a slave. Should we forward this packet to the master? - - // Is this a walled garden session, or something that needs it's - // idle time updated?? - - // Maintain the idle timeouts on the master. If this would - // significantly reset the idletimeout, run it via the master - // to refresh the master's idle timer. - // Not sure this is ideal: It may re-order packets. - - if (session[s].walled_garden || (session[s].last_packet + (ECHO_TIMEOUT/2)) < time_now) - { - master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); - session[s].last_packet = time_now; - return; - } - // fall through to processipin. - } else - session[s].last_packet = time_now; + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } processipin(t, s, p, l); } else @@ -2124,16 +2110,6 @@ int regular_cleanups(void) a = 0; // dead, no need to check for other actions } - if (a & CLI_SESS_SNOOP) - { - log(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n", - inet_toa(cli_session_actions[s].snoop_ip), cli_session_actions[s].snoop_port); - - session[s].snoop_ip = cli_session_actions[s].snoop_ip; - session[s].snoop_port = cli_session_actions[s].snoop_port; - send++; - } - if (a & CLI_SESS_NOSNOOP) { log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n"); @@ -2141,19 +2117,30 @@ int regular_cleanups(void) session[s].snoop_port = 0; send++; } - - if (a & CLI_SESS_THROTTLE) + else if (a & CLI_SESS_SNOOP) { - log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %d)\n", - cli_session_actions[s].throttle); + 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); - throttle_session(s, cli_session_actions[s].throttle); + session[s].snoop_ip = cli_session_actions[s].snoop_ip; + session[s].snoop_port = cli_session_actions[s].snoop_port; + send++; } if (a & CLI_SESS_NOTHROTTLE) { log(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n"); - throttle_session(s, 0); + throttle_session(s, 0, 0); + send++; + } + else if (a & CLI_SESS_THROTTLE) + { + log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n", + cli_session_actions[s].throttle_in, + cli_session_actions[s].throttle_out); + + throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out); + send++; } if (send) @@ -2163,7 +2150,7 @@ int regular_cleanups(void) } } - if (config->accounting_dir && next_acct <= TIME) + if (*config->accounting_dir && next_acct <= TIME) { // Dump accounting data next_acct = TIME + ACCT_TIME; @@ -2203,8 +2190,8 @@ int still_busy(void) return 1; } - // We stop waiting for radius after BUSY_WAIT_TIMEOUT 1/10th seconds - if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT) + // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds + if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME) { log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); return 0; @@ -2228,11 +2215,13 @@ int still_busy(void) return 0; } +static fd_set readset; +static int readset_n = 0; + // main loop - gets packets on tun or udp and processes them void mainloop(void) { - fd_set cr; - int cn, i; + int i; u8 buf[65536]; struct timeval to; clockt next_cluster_ping = 0; // send initial ping immediately @@ -2241,29 +2230,22 @@ void mainloop(void) 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(&cr); - FD_SET(udpfd, &cr); - FD_SET(tunfd, &cr); - FD_SET(controlfd, &cr); - FD_SET(clifd, &cr); - if (cluster_sockfd) FD_SET(cluster_sockfd, &cr); - cn = udpfd; - if (cn < tunfd) cn = tunfd; - if (cn < controlfd) cn = controlfd; - if (cn < clifd) cn = clifd; - if (cn < cluster_sockfd) cn = cluster_sockfd; - for (i = 0; i < config->num_radfds; i++) - { - if (!radfds[i]) continue; - FD_SET(radfds[i], &cr); - if (radfds[i] > cn) - cn = radfds[i]; - } + FD_ZERO(&readset); + FD_SET(udpfd, &readset); + FD_SET(tunfd, &readset); + FD_SET(controlfd, &readset); + FD_SET(clifd, &readset); + if (cluster_sockfd) FD_SET(cluster_sockfd, &readset); + readset_n = udpfd; + if (tunfd > readset_n) readset_n = tunfd; + if (controlfd > readset_n) readset_n = controlfd; + if (clifd > readset_n) readset_n = clifd; + if (cluster_sockfd > readset_n) readset_n = cluster_sockfd; while (!main_quit || still_busy()) { fd_set r; - int n = cn; + int n = readset_n; #ifdef BGP fd_set w; int bgp_set[BGP_NUM_PEERS]; @@ -2275,7 +2257,7 @@ void mainloop(void) update_config(); } - memcpy(&r, &cr, sizeof(fd_set)); + memcpy(&r, &readset, sizeof(fd_set)); to.tv_sec = 0; to.tv_usec = 100000; // 1/10th of a second. @@ -2307,7 +2289,8 @@ void mainloop(void) TIME = now(); if (n < 0) { - if (errno == EINTR) + if (errno == EINTR || + errno == ECHILD) // EINTR was clobbered by sigchild_handler() continue; log(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); @@ -2340,17 +2323,22 @@ void mainloop(void) break; } } - for (i = 0; i < config->num_radfds; i++) - if (FD_ISSET(radfds[i], &r)) - processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); + + if (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; @@ -2440,79 +2428,141 @@ void mainloop(void) // Important!!! We MUST not process any packets past this point! } +static void stripdomain(char *host) +{ + char *p; + + if ((p = strchr(host, '.'))) + { + char *domain = 0; + char _domain[1024]; + + // strip off domain + FILE *resolv = fopen("/etc/resolv.conf", "r"); + if (resolv) + { + char buf[1024]; + char *b; + + while (fgets(buf, sizeof(buf), resolv)) + { + if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6)) + continue; + + if (!isspace(buf[6])) + continue; + + b = buf + 7; + while (isspace(*b)) b++; + + if (*b) + { + char *d = b; + while (*b && !isspace(*b)) b++; + *b = 0; + if (buf[0] == 'd') // domain is canonical + { + domain = d; + break; + } + + // first search line + if (!domain) + { + // hold, may be subsequent domain line + strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0; + domain = _domain; + } + } + } + + fclose(resolv); + } + + if (domain) + { + int hl = strlen(host); + int dl = strlen(domain); + if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain)) + host[hl -dl - 1] = 0; + } + else + { + *p = 0; // everything after first dot + } + } +} + // Init data structures -void initdata(void) +void initdata(int optdebug, char *optconfig) { int i; - _statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (_statistics == MAP_FAILED) + if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) { - log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); exit(1); } - config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (config == MAP_FAILED) + if (!(config = shared_malloc(sizeof(struct configt)))) { - log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno)); + 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, CONFIGFILE, sizeof(config->config_file) - 1); - tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (tunnel == MAP_FAILED) + strncpy(config->config_file, optconfig, strlen(optconfig)); + config->debug = optdebug; + config->num_tbfs = MAXTBFS; + config->rl_rate = 28; // 28kbps + + if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL))) { - log(0, 0, 0, 0, "Error doing mmap for tunnels: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); exit(1); } - session = mmap(NULL, sizeof(sessiont) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (session == MAP_FAILED) + if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); exit(1); } - sess_count = mmap(NULL, sizeof(sessioncountt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (sess_count == MAP_FAILED) + if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for sessions_count: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno)); exit(1); } - radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (radius == MAP_FAILED) + if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS))) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); exit(1); } - ip_address_pool = mmap(NULL, sizeof(ippoolt) * MAXIPPOOL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ip_address_pool == MAP_FAILED) + + if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL))) { - log(0, 0, 0, 0, "Error doing mmap for ip_address_pool: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %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) + if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) { - log(0, 0, 0, 0, "Error doing mmap for ringbuffer: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); exit(1); } memset(ringbuffer, 0, sizeof(struct Tringbuffer)); #endif - cli_session_actions = mmap(NULL, sizeof(struct cli_session_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_session_actions == MAP_FAILED) + if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for cli session actions: %s\n", strerror(errno)); + 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); - cli_tunnel_actions = mmap(NULL, sizeof(struct cli_tunnel_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_tunnel_actions == MAP_FAILED) + + if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing mmap for cli tunnel actions: %s\n", strerror(errno)); + 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); @@ -2537,18 +2587,17 @@ void initdata(void) if (!*hostname) { - char *p; // Grab my hostname unless it's been specified gethostname(hostname, sizeof(hostname)); - if ((p = strchr(hostname, '.'))) *p = 0; + stripdomain(hostname); } + _statistics->start_time = _statistics->last_reset = time(NULL); #ifdef BGP - bgp_peers = mmap(NULL, sizeof(struct bgp_peer) * BGP_NUM_PEERS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (bgp_peers == MAP_FAILED) + if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS))) { - log(0, 0, 0, 0, "Error doing mmap for bgp: %s\n", strerror(errno)); + log(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno)); exit(1); } #endif /* BGP */ @@ -2856,7 +2905,7 @@ void dump_acct_info() for (i = 0; i < MAXSESSION; i++) { - if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden) + if (!session[i].opened || !session[i].ip || !(session[i].cin || session[i].cout) || !*session[i].user || session[i].walled_garden) continue; if (!f) { @@ -2879,11 +2928,11 @@ void dump_acct_info() log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); fprintf(f, "%s %s %d %u %u\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (u32)session[i].cin, // uptxoctets - (u32)session[i].cout); // downrxoctets + session[i].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; @@ -2898,13 +2947,14 @@ int main(int argc, char *argv[]) { int o; int optdebug = 0; + char *optconfig = CONFIGFILE; _program_name = strdup(argv[0]); time(&basetime); // start clock // scan args - while ((o = getopt(argc, argv, "vc:h:a:")) >= 0) + while ((o = getopt(argc, argv, "dvc:h:")) >= 0) { switch (o) { @@ -2916,10 +2966,12 @@ int main(int argc, char *argv[]) case 'v': optdebug++; break; + case 'c': + optconfig = optarg; + break; case 'h': snprintf(hostname, sizeof(hostname), "%s", optarg); break; - case '?': default: printf("Args are:\n" "\t-d\tDetach from terminal\n" @@ -2941,13 +2993,11 @@ int main(int argc, char *argv[]) initiptables(); initplugins(); - initdata(); - - config->debug = optdebug; + initdata(optdebug, optconfig); - init_tbf(); init_cli(hostname); read_config_file(); + 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"); @@ -3518,17 +3568,19 @@ int sessionsetup(tunnelidt t, sessionidt s) 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(3, 0, s, t, " No IP allocated. Assigned %s from pool\n", - inet_toa(htonl(session[s].ip))); - else + 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))); } @@ -3563,12 +3615,12 @@ int sessionsetup(tunnelidt t, sessionidt 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].sid) + 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].sid = ++last_sid; + session[s].unique_id = ++last_id; } // Run the plugin's against this new session. @@ -3577,10 +3629,9 @@ int sessionsetup(tunnelidt t, sessionidt s) run_plugins(PLUGIN_NEW_SESSION, &data); } - // Force throttling on or off (Actually : refresh the current throttling status) - // This has the advantage of cleaning up after another throttled user who may have left - // firewall rules lying around - throttle_session(s, session[s].throttle); + // Allocate TBFs if throttled + if (session[s].throttle_in || session[s].throttle_out) + throttle_session(s, session[s].throttle_in, session[s].throttle_out); session[s].last_packet = time_now; @@ -3669,6 +3720,12 @@ int load_session(sessionidt s, sessiont *new) // 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. @@ -3924,19 +3981,33 @@ tunnelidt new_tunnel() // void become_master(void) { - int s; + int s, i; run_plugins(PLUGIN_BECOME_MASTER, NULL); - for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + // 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()) { - if (!session[s].tunnel) // Not an in-use session. - continue; + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { + if (!session[s].tunnel) // Not an in-use session. + continue; - run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + } + exit(0); } -} - + // add radius fds + for (i = 0; i < config->num_radfds; i++) + { + 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) { @@ -4015,3 +4086,77 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc 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; +} +