X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/99b207fddf711ac088ac59186ed7cd361b5fb9ed..db0ded520aee06ef21acbc519ea078e2463a4a96:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index 6a74ffd..1bcdf1d 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 1.18 2004-07-28 06:12:30 fred_nerk Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.34 2004-10-29 04:01:11 bodea Exp $"; #include #include @@ -63,7 +63,7 @@ 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 @@ -94,19 +94,21 @@ int bgp_configured = 0; struct config_descriptt config_values[] = { CONFIG("debug", debug, INT), CONFIG("log_file", log_filename, STRING), + CONFIG("pid_file", pid_file, STRING), CONFIG("l2tp_secret", l2tpsecret, STRING), CONFIG("primary_dns", default_dns1, IP), CONFIG("secondary_dns", default_dns2, IP), CONFIG("save_state", save_state, BOOL), CONFIG("primary_radius", radiusserver[0], IP), CONFIG("secondary_radius", radiusserver[1], IP), - CONFIG("primary_radius_port",radiusport[0], SHORT), - CONFIG("secondary_radius_port",radiusport[1], SHORT), + CONFIG("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), @@ -168,6 +170,7 @@ 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); @@ -537,20 +540,28 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) if (CLI_HELP_REQUESTED) return CLI_HELP_NO_ARGS; - cli_print(cli, "%7s %s", "Sess#", "IP Address"); + cli_print(cli, "%7s %s", "Sess#", "IP Address"); - for (i = 0; i < 256; ++i) { - if (!d[i]) continue; + for (i = 0; i < 256; ++i) + { + if (!d[i]) + continue; e = (char**) d[i]; - for (j = 0; j < 256; ++j) { - if (!e[j]) continue; + for (j = 0; j < 256; ++j) + { + if (!e[j]) + continue; f = (char**) e[j]; - for (k = 0; k < 256; ++k) { - if (!f[k]) continue; + for (k = 0; k < 256; ++k) + { + if (!f[k]) + continue; g = (char**)f[k]; - for (l = 0; l < 256; ++l) { - if (!g[l]) continue; - cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l); + for (l = 0; l < 256; ++l) + { + if (!g[l]) + continue; + cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l); ++count; } } @@ -572,7 +583,8 @@ sessionidt sessionbyuser(char *username) int s; CSTAT(call_sessionbyuser); - for (s = 1; s < MAXSESSION ; ++s) { + for (s = 1; s < MAXSESSION ; ++s) + { if (session[s].walled_garden) continue; // Skip walled garden users. @@ -741,7 +753,8 @@ void processipout(u8 * buf, int len) static int rate = 0; // Number of ICMP packets we've sent this second. static int last = 0; // Last time we reset the ICMP packet counter 'rate'. - if (last != time_now) { + if (last != time_now) + { last = time_now; rate = 0; } @@ -781,7 +794,8 @@ void processipout(u8 * buf, int len) // Add on L2TP header { u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); - if (!p) { + if (!p) + { log(3, session[s].ip, s, t, "failed to send packet in processipout.\n"); return; } @@ -807,7 +821,8 @@ void send_ipout(sessionidt s, u8 *buf, int len) u8 b[MAXETHER + 20]; - if (len < 0 || len > MAXETHER) { + if (len < 0 || len > MAXETHER) + { log(1,0,0,0, "Odd size IP packet: %d bytes\n", len); return; } @@ -832,7 +847,8 @@ void send_ipout(sessionidt s, u8 *buf, int len) // Add on L2TP header { u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); - if (!p) { + if (!p) + { log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n"); return; } @@ -959,11 +975,16 @@ int throttle_session(sessionidt s, int throttle) if (!session[s].tunnel) return 0; // No-one home. - if (!*session[s].user) - return 0; // User not logged in + if (!*session[s].user) + return 0; // User not logged in - if (throttle) { - if (session[s].tbf_in || session[s].tbf_out) { + if (throttle) + { + int rate_in = throttle & 0x0000FFFF; + int rate_out = throttle >> 16; + + if (session[s].tbf_in || session[s].tbf_out) + { if (throttle == session[s].throttle) return 1; @@ -973,10 +994,12 @@ int throttle_session(sessionidt s, int throttle) 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 (rate_in) session[s].tbf_in = new_tbf(s, rate_in * 1024 / 4, rate_in * 1024 / 8, send_ipin); + if (rate_out) session[s].tbf_out = new_tbf(s, rate_out * 1024 / 4, rate_out * 1024 / 8, send_ipout); - if (throttle != session[s].throttle) { // Changed. Flood to slaves. + if (throttle != session[s].throttle) + { + // Changed. Flood to slaves. session[s].throttle = throttle; cluster_send_session(s); } @@ -995,7 +1018,9 @@ int throttle_session(sessionidt s, int throttle) free_tbf(session[s].tbf_out); session[s].tbf_out = 0; - if (throttle != session[s].throttle) { // Changed. Flood to slaves. + if (throttle != session[s].throttle) + { + // Changed. Flood to slaves. session[s].throttle = throttle; cluster_send_session(s); } @@ -1029,7 +1054,8 @@ void sessionshutdown(sessionidt s, char *reason) } // RADIUS Stop message - if (session[s].opened && !walled_garden && !dead) { + if (session[s].opened && !walled_garden && !dead) + { u16 r = session[s].radius; if (!r) { @@ -1104,7 +1130,8 @@ void sendipcp(tunnelidt t, sessionidt s) } q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP); - if (!q) { + if (!q) + { log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n"); return; } @@ -1286,7 +1313,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) char called[MAXTEL] = ""; // called number char calling[MAXTEL] = ""; // calling number - if (!config->cluster_iam_master) { + if (!config->cluster_iam_master) + { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } @@ -1307,7 +1335,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // // Is this a duplicate of the first packet? (SCCRQ) // - for ( i = 1; i <= config->cluster_highest_tunnelid ; ++i) { + 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) ) @@ -1317,7 +1346,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } } - if (!t) { + if (!t) + { if (!(t = new_tunnel())) { log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n"); @@ -1424,6 +1454,13 @@ 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) { @@ -1456,17 +1493,21 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { u16 rescode = ntohs(*(u16 *)(b)); const char* resdesc = "(unknown)"; - if (message == 4) { /* StopCCN */ + if (message == 4) + { /* StopCCN */ if (rescode <= MAX_STOPCCN_RESULT_CODE) resdesc = stopccn_result_codes[rescode]; - } else if (message == 14) { /* CDN */ + } + else if (message == 14) + { /* CDN */ if (rescode <= MAX_CDN_RESULT_CODE) resdesc = cdn_result_codes[rescode]; } log(4, ntohl(addr->sin_addr.s_addr), s, t, " Result Code %d: %s\n", rescode, resdesc); - if (n >= 4) { + if (n >= 4) + { u16 errcode = ntohs(*(u16 *)(b + 2)); const char* errdesc = "(unknown)"; if (errcode <= MAX_ERROR_CODE) @@ -1534,6 +1575,11 @@ 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); @@ -1779,6 +1825,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // TBA break; case 12: // ICCN + if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number session[s].l2tp_flags = aflags; // set flags received log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags); @@ -2034,7 +2081,7 @@ int regular_cleanups(void) if (!session[s].tunnel) // Session isn't in use continue; - if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED) ) + if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) { // IPCP has not completed yet. Resend log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); @@ -2064,7 +2111,8 @@ int regular_cleanups(void) u8 b[MAXCONTROL] = {0}; u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); - if (!q) { + if (!q) + { log(3, session[s].ip, s, t, "failed to send ECHO packet.\n"); continue; } @@ -2078,7 +2126,6 @@ int regular_cleanups(void) (int)(time_now - session[s].last_packet)); tunnelsend(b, 24, session[s].tunnel); // send it if (++count >= MAX_ACTIONS) break; - continue; } // Check for actions requested from the CLI @@ -2114,8 +2161,9 @@ int regular_cleanups(void) if (a & CLI_SESS_THROTTLE) { - 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, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n", + cli_session_actions[s].throttle & 0xFFFF, + cli_session_actions[s].throttle >> 16); throttle_session(s, cli_session_actions[s].throttle); } @@ -2130,11 +2178,10 @@ int regular_cleanups(void) cluster_send_session(s); if (++count >= MAX_ACTIONS) break; - continue; } } - if (config->accounting_dir && next_acct <= TIME) + if (*config->accounting_dir && next_acct <= TIME) { // Dump accounting data next_acct = TIME + ACCT_TIME; @@ -2156,18 +2203,31 @@ int regular_cleanups(void) int still_busy(void) { int i; - static int last_talked = 0; - for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) { + static clockt last_talked = 0; + static clockt start_busy_wait = 0; + if (start_busy_wait == 0) + start_busy_wait = TIME; + + for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) + { if (!tunnel[i].controlc) continue; - if (last_talked != TIME) { + if (last_talked != TIME) + { log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i); last_talked = TIME; } return 1; } + // We stop waiting for radius after BUSY_WAIT_TIMEOUT 1/10th seconds + if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT) + { + log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); + return 0; + } + for (i = 1; i < MAXRADIUS; i++) { if (radius[i].state == RADIUSNULL) @@ -2175,7 +2235,8 @@ int still_busy(void) if (radius[i].state == RADIUSWAIT) continue; - if (last_talked != TIME) { + if (last_talked != TIME) + { log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); last_talked = TIME; } @@ -2300,13 +2361,17 @@ void mainloop(void) for (i = 0; i < config->num_radfds; i++) if (FD_ISSET(radfds[i], &r)) processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); - if (FD_ISSET(cluster_sockfd, &r)) { + + if (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; @@ -2350,7 +2415,8 @@ void mainloop(void) // Runs on all machines both master and slave. { static clockt last_run = 0; - if (last_run != TIME) { + if (last_run != TIME) + { last_run = TIME; tbf_run_timer(); } @@ -2360,10 +2426,15 @@ void mainloop(void) * something to read, else under load this will never actually run.... * */ - if (config->cluster_iam_master && next_clean <= time_now) { - if (regular_cleanups()) { // Did it finish? + if (config->cluster_iam_master && next_clean <= time_now) + { + if (regular_cleanups()) + { + // Did it finish? next_clean = time_now + 1 ; // Didn't finish. Check quickly. - } else { + } + else + { next_clean = time_now + config->cleanup_interval; // Did. Move to next interval. } } @@ -2391,78 +2462,75 @@ void mainloop(void) } // 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); @@ -2473,7 +2541,8 @@ void initdata(void) memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); // Put all the sessions on the free list marked as undefined. - for (i = 1; i < MAXSESSION - 1; i++) { + for (i = 1; i < MAXSESSION - 1; i++) + { session[i].next = i + 1; session[i].tunnel = T_UNDEF; // mark it as not filled in. } @@ -2481,9 +2550,8 @@ void initdata(void) sessionfree = 1; // Mark all the tunnels as undefined (waiting to be filled in by a download). - for (i = 1; i < MAXTUNNEL- 1; i++) { + for (i = 1; i < MAXTUNNEL- 1; i++) tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. - } if (!*hostname) { @@ -2492,13 +2560,13 @@ void initdata(void) gethostname(hostname, sizeof(hostname)); if ((p = strchr(hostname, '.'))) *p = 0; } + _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 */ @@ -2605,7 +2673,8 @@ void rebuild_address_pool(void) // // Zero the IP pool allocation, and build // a map from IP address to pool index. - for (i = 1; i < MAXIPPOOL; ++i) { + for (i = 1; i < MAXIPPOOL; ++i) + { ip_address_pool[i].assigned = 0; ip_address_pool[i].session = 0; if (!ip_address_pool[i].address) @@ -2614,13 +2683,16 @@ void rebuild_address_pool(void) cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index. } - for (i = 0; i < MAXSESSION; ++i) { + for (i = 0; i < MAXSESSION; ++i) + { int ipid; if (!session[i].ip || !session[i].tunnel) continue; ipid = - lookup_ipmap(htonl(session[i].ip)); - if (session[i].ip_pool_index < 0) { // Not allocated out of the pool. + if (session[i].ip_pool_index < 0) + { + // Not allocated out of the pool. if (ipid < 1) // Not found in the pool either? good. continue; @@ -2631,7 +2703,8 @@ void rebuild_address_pool(void) } - if (ipid > MAXIPPOOL || ipid < 0) { + 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; @@ -2787,54 +2860,55 @@ void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port) 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; - CSTAT(call_dump_acct_info); + 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); + strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t)); + snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr); - for (i = 0; i < MAXSESSION; i++) - { - if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden) - continue; - if (!f) + for (i = 0; i < MAXSESSION; i++) { - time_t now = time(NULL); - if (!(f = fopen(filename, "w"))) - { - log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno)); - return; - } - log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename); - fprintf(f, "# dslwatch.pl dump file V1.01\n" - "# host: %s\n" - "# time: %ld\n" - "# uptime: %ld\n" - "# format: username ip qos uptxoctets downrxoctets\n", - hostname, - now, - now - basetime); - } - - log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); - fprintf(f, "%s %s %d %u %u\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (u32)session[i].cin, // uptxoctets - (u32)session[i].cout); // downrxoctets - - session[i].pin = session[i].cin = 0; - session[i].pout = session[i].cout = 0; - } - - if (f) fclose(f); + if (!session[i].opened || !session[i].ip || (!session[i].cin && !session[i].cout) || !*session[i].user || session[i].walled_garden) + continue; + if (!f) + { + time_t now = time(NULL); + if (!(f = fopen(filename, "w"))) + { + log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno)); + return ; + } + log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename); + fprintf(f, "# dslwatch.pl dump file V1.01\n" + "# host: %s\n" + "# time: %ld\n" + "# uptime: %ld\n" + "# format: username ip qos uptxoctets downrxoctets\n", + hostname, + now, + now - basetime); + } + + log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); + fprintf(f, "%s %s %d %u %u\n", + session[i].user, // username + inet_toa(htonl(session[i].ip)), // ip + (session[i].throttle) ? 2 : 1, // qos + (u32)session[i].cin, // uptxoctets + (u32)session[i].cout); // downrxoctets + + session[i].pin = session[i].cin = 0; + session[i].pout = session[i].cout = 0; + } + + if (f) + fclose(f); } // Main program @@ -2842,13 +2916,14 @@ 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) { @@ -2860,10 +2935,12 @@ 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" @@ -2885,13 +2962,11 @@ int main(int argc, char *argv[]) initiptables(); initplugins(); - initdata(); + initdata(optdebug, optconfig); - config->debug = optdebug; - - init_tbf(); - init_cli(hostname); read_config_file(); + init_tbf(config->num_tbfs); + init_cli(hostname); log(0, 0, 0, 0, "L2TPNS version " VERSION "\n"); log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n"); @@ -2940,11 +3015,11 @@ int main(int argc, char *argv[]) signal(SIGPIPE, SIG_IGN); bgp_setup(config->as_number); bgp_add_route(config->bind_address, 0xffffffff); - if (*config->bgp_peer[0]) + 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]) + if (*config->bgp_peer[1]) bgp_start(&bgp_peers[1], config->bgp_peer[1], config->bgp_peer_as[1], 0); #endif /* BGP */ @@ -2995,6 +3070,10 @@ int main(int argc, char *argv[]) /* 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); @@ -3081,168 +3160,178 @@ void sigchild_handler(int signal) void read_state() { - struct stat sb; - int i; - ippoolt itmp; - FILE *f; - char magic[sizeof(DUMP_MAGIC)-1]; - u32 buf[2]; + struct stat sb; + int i; + ippoolt itmp; + FILE *f; + char magic[sizeof(DUMP_MAGIC) - 1]; + u32 buf[2]; - if (!config->save_state) - { - unlink(STATEFILE); - return; - } + if (!config->save_state) + { + unlink(STATEFILE); + return ; + } - if (stat(STATEFILE, &sb) < 0) - { - unlink(STATEFILE); - return; - } + if (stat(STATEFILE, &sb) < 0) + { + unlink(STATEFILE); + return ; + } - if (sb.st_mtime < (time(NULL) - 60)) - { - log(0, 0, 0, 0, "State file is too old to read, ignoring\n"); + 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); - 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_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"); + + 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_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) @@ -3271,13 +3360,13 @@ void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **ch static int facility_value(char *name) { - int i; - for (i = 0; facilitynames[i].c_name; i++) - { - if (strcmp(facilitynames[i].c_name, name) == 0) - return facilitynames[i].c_val; - } - return 0; + int i; + for (i = 0; facilitynames[i].c_name; i++) + { + if (strcmp(facilitynames[i].c_name, name) == 0) + return facilitynames[i].c_val; + } + return 0; } void update_config() @@ -3401,6 +3490,22 @@ void update_config() 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; } @@ -3409,7 +3514,8 @@ void read_config_file() 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; } @@ -3431,7 +3537,6 @@ 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) @@ -3441,7 +3546,11 @@ int sessionsetup(tunnelidt t, sessionidt s) log(3, 0, s, t, " No IP allocated. Assigned %s from pool\n", inet_toa(htonl(session[s].ip))); else + { log(0, 0, s, t, " No IP allocated. The IP address pool is FULL!\n"); + sessionshutdown(s, "No IP addresses available"); + return 0; + } } @@ -3476,10 +3585,12 @@ 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) { // did this session just finish radius? + 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. @@ -3520,7 +3631,8 @@ int load_session(sessionidt s, sessiont *new) // Sanity checks. if (new->ip_pool_index >= MAXIPPOOL || - new->tunnel >= MAXTUNNEL) { + new->tunnel >= MAXTUNNEL) + { log(0,0,s,0, "Strange session update received!\n"); // FIXME! What to do here? return 0; @@ -3551,7 +3663,9 @@ int load_session(sessionidt s, sessiont *new) uncache_ipmap(session[s].ip); } - if (new->ip) { // If there's a new one, add it. + 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 @@ -3835,7 +3949,8 @@ void become_master(void) int s; run_plugins(PLUGIN_BECOME_MASTER, NULL); - for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { if (!session[s].tunnel) // Not an in-use session. continue; @@ -3857,7 +3972,8 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc time(&time_now); for (i = 0; i < 64;++i) buckets[i] = 0; - for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { int idle; if (!session[s].tunnel) continue; @@ -3873,7 +3989,8 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc ++buckets[idle]; } - for (i = 0; i < 63; ++i) { + for (i = 0; i < 63; ++i) + { cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]); } cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]); @@ -3893,7 +4010,8 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc time(&time_now); for (i = 0; i < 64;++i) buckets[i] = 0; - for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { int open = 0, d; if (!session[s].tunnel) continue; @@ -3901,7 +4019,8 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc d = time_now - session[s].opened; if (d < 0) d = 0; - while (d > 1 && open < 32) { + while (d > 1 && open < 32) + { ++open; d >>= 1; // half. } @@ -3910,10 +4029,85 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc } s = 1; - for (i = 0; i < 30; ++i) { + for (i = 0; i < 30; ++i) + { cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]); s <<= 1; } cli_print(cli, "%d total sessions open.", count); return CLI_OK; } + +/* Unhide an avp. + * + * This unencodes the AVP using the L2TP CHAP secret and the + * previously stored random vector. It replaces the hidden data with + * the cleartext data and returns the length of the cleartext data + * (including the AVP "header" of 6 bytes). + * + * Based on code from rp-l2tpd by Roaring Penguin Software Inc. + */ +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; +} +