/* * pptpd.c * * Grabs any command line argument and processes any further options in * the pptpd config file, before throwing over to pptpmanager.c. * * $Id: pptpd.c,v 1.18 2006/09/04 23:17:25 quozl Exp $ */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef __linux__ #define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */ #endif #ifdef __svr4__ #define __EXTENSIONS__ 1 /* strdup() prototype */ #endif #ifdef __sgi__ #define _XOPEN_SOURCE 500 /* strdup() prototype */ #endif #include "our_syslog.h" #include "our_getopt.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "configfile.h" #include "defaults.h" #include "compat.h" #include "pptpmanager.h" #ifdef CONFIG_NETtel #include #endif /* command line arg variables */ char *ppp_binary = NULL; char *pppdoptstr = NULL; char *speedstr = NULL; char *bindaddr = NULL; #ifdef BCRELAY char *bcrelay = NULL; #endif int pptp_debug = 0; int pptp_noipparam = 0; int pptp_logwtmp = 0; int pptp_delegate = 0; int pptp_stimeout = STIMEOUT_DEFAULT; int pptp_connections = CONNECTIONS_DEFAULT; /* Local prototypes */ static void processIPStr(int type, char *ipstr); #ifndef HAVE_DAEMON static void my_daemon(int argc, char **argv); #endif static void log_pid(char *pid_file); static char *lookup(char *); #ifdef BCRELAY static void launch_bcrelay(); static pid_t bcrelayfork; #endif static void showusage(char *prog) { printf("\npptpd v%s\n", VERSION); printf("Usage: pptpd [options], where options are:\n\n"); #ifdef BCRELAY printf(" [-b] [--bcrelay if] Use broadcast relay for broadcasts comming from.\n"); printf(" the specified interface (default is eth1).\n"); #endif printf(" [-c] [--conf file] Specifies the config file to read default\n"); printf(" settings from (default is %s).\n", PPTPD_CONFIG_FILE_DEFAULT); printf(" [-d] [--debug] Turns on debugging (to syslog).\n"); printf(" [-e] [--ppp file] Use alternate pppd binary, default %s.\n", PPP_BINARY); printf(" [-f] [--fg] Run in foreground.\n"); printf(" [-h] [--help] Displays this help message.\n"); printf(" [-i] [--noipparam] Suppress the passing of the client's IP address\n"); printf(" to PPP, which is done by default otherwise.\n"); printf(" [-l] [--listen x.x.x.x] Specifies IP of local interface to listen to.\n"); #if !defined(BSDUSER_PPP) printf(" [-o] [--option file] Specifies the PPP options file to use\n"); printf(" (default is /etc/ppp/options).\n"); #endif printf(" [-p] [--pidfile file] Specifies the file to write the process ID to\n"); printf(" (default is /var/run/pptpd.pid).\n"); #if !defined(BSDUSER_PPP) printf(" [-s] [--speed baud] Specifies the baud speed for the PPP daemon\n"); printf(" (default is 115200).\n"); #endif printf(" [-t] [--stimeout seconds] Specifies the timeout for the first packet. This is a DOS protection\n"); printf(" (default is 10).\n"); printf(" [-v] [--version] Displays the pptpd version number.\n"); printf(" [-w] [--logwtmp] Update wtmp as users login.\n"); printf(" [-C] [--connections n] Limit on number of connections.\n"); printf(" [-D] [--delegate] Delegate IP allocation to pppd.\n"); printf("\n\nLogs and debugging go to syslog as DAEMON."); printf("\n\nCommand line options will override any default settings and any settings\n"); printf("specified in the config file (default config file: %s).\n\n", PPTPD_CONFIG_FILE_DEFAULT); } static void showversion() { printf("pptpd v%s\n", VERSION); } int main(int argc, char **argv) { /* command line options */ int c; /* function-local options */ int foreground = FALSE; char *pid_file = NULL; /* config file */ char *configFile = NULL; /* config file parsing temp strings */ char tmp[MAX_CONFIG_STRING_SIZE], *tmpstr; /* open a connection to the syslog daemon */ openlog("pptpd", LOG_PID, PPTP_FACILITY); /* process command line options */ while (1) { int option_index = 0; #ifdef BCRELAY char *optstring = "b:c:de:fhil:o:p:s:t:vwC:D"; #else char *optstring = "c:de:fhil:o:p:s:t:vwC:D"; #endif static struct option long_options[] = { #ifdef BCRELAY {"bcrelay", 1, 0, 0}, #endif {"conf", 1, 0, 0}, {"debug", 0, 0, 0}, {"ppp", 1, 0, 0}, {"fg", 0, 0, 0}, {"help", 0, 0, 0}, {"noipparam", 0, 0, 0}, {"listen", 1, 0, 0}, {"option", 1, 0, 0}, {"pidfile", 1, 0, 0}, {"speed", 1, 0, 0}, {"stimeout", 1, 0, 0}, {"version", 0, 0, 0}, {"logwtmp", 0, 0, 0}, {"connections", 1, 0, 0}, {"delegate", 0, 0, 0}, {0, 0, 0, 0} }; c = getopt_long(argc, argv, optstring, long_options, &option_index); if (c == -1) break; /* convert long options to short form */ if (c == 0) #ifdef BCRELAY c = "bcdefhilopstvwCD"[option_index]; #else c = "cdefhilopstvwCD"[option_index]; #endif switch (c) { #ifdef BCRELAY case 'b': /* --bcrelay */ if (bcrelay) free(bcrelay); bcrelay = strdup(optarg); break; #endif case 'l': /* --listen */ tmpstr = lookup(optarg); if (!tmpstr) { syslog(LOG_ERR, "MGR: Invalid listening address: %s!", optarg); return 1; } if (bindaddr) free(bindaddr); bindaddr = strdup(tmpstr); break; case 'h': /* --help */ showusage(argv[0]); return 0; case 'i': /* --noipparam */ pptp_noipparam = TRUE; break; case 'e': /* --ppp */ if (ppp_binary) free(ppp_binary); ppp_binary = strdup(optarg); break; case 'd': /* --debug */ pptp_debug = TRUE; break; case 'f': /* --fg */ foreground = TRUE; break; case 'v': /* --version */ showversion(); return 0; case 'w': /* --logwtmp */ pptp_logwtmp = TRUE; break; case 'C': /* --connections */ pptp_connections = atoi(optarg); break; case 'D': /* --delegate */ pptp_delegate = TRUE; break; case 'o': /* --option */ if (pppdoptstr) free(pppdoptstr); pppdoptstr = strdup(optarg); break; case 'p': /* --pidfile */ if (pid_file) free(pid_file); pid_file = strdup(optarg); break; case 's': /* --speed */ if (speedstr) free(speedstr); speedstr = strdup(optarg); break; case 't': /* --stimeout */ pptp_stimeout = atoi(optarg); break; case 'c': /* --conf */ { FILE *f; if (!(f = fopen(optarg, "r"))) { syslog(LOG_ERR, "MGR: Config file not found!"); return 1; } fclose(f); if(configFile) free(configFile); configFile = strdup(optarg); break; } default: showusage(argv[0]); return 1; } } /* Now that we have all the command line args.. lets open the * conf file and add anything else (remembering not to override * anything since the command line has more privilages :-) */ if (!configFile) configFile = strdup(PPTPD_CONFIG_FILE_DEFAULT); if (read_config_file(configFile, CONNECTIONS_KEYWORD, tmp) > 0) { pptp_connections = atoi(tmp); if (pptp_connections <= 0) pptp_connections = CONNECTIONS_DEFAULT; } slot_init(pptp_connections); if (!pptp_debug && read_config_file(configFile, DEBUG_KEYWORD, tmp) > 0) pptp_debug = TRUE; #ifdef BCRELAY if (!bcrelay && read_config_file(configFile, BCRELAY_KEYWORD, tmp) > 0) bcrelay = strdup(tmp); #endif if (!pptp_stimeout && read_config_file(configFile, STIMEOUT_KEYWORD, tmp) > 0) { pptp_stimeout = atoi(tmp); if (pptp_stimeout <= 0) pptp_stimeout = STIMEOUT_DEFAULT; } if (!pptp_noipparam && read_config_file(configFile, NOIPPARAM_KEYWORD, tmp) > 0) { pptp_noipparam = TRUE; } if (!bindaddr && read_config_file(configFile, LISTEN_KEYWORD, tmp) > 0) { tmpstr = lookup(tmp); if(!tmpstr) { syslog(LOG_ERR, "MGR: Invalid listening address: %s!", tmp); return 1; } bindaddr = strdup(tmpstr); } if (!speedstr && read_config_file(configFile, SPEED_KEYWORD, tmp) > 0) speedstr = strdup(tmp); if (!pppdoptstr && read_config_file(configFile, PPPD_OPTION_KEYWORD, tmp) > 0) { pppdoptstr = strdup(tmp); } if (!ppp_binary && read_config_file(configFile, PPP_BINARY_KEYWORD, tmp) > 0) { ppp_binary = strdup(tmp); } if (!pptp_logwtmp && read_config_file(configFile, LOGWTMP_KEYWORD, tmp) > 0) { pptp_logwtmp = TRUE; } if (!pptp_delegate && read_config_file(configFile, DELEGATE_KEYWORD, tmp) > 0) { pptp_delegate = TRUE; } if (!pid_file) pid_file = strdup((read_config_file(configFile, PIDFILE_KEYWORD, tmp) > 0) ? tmp : PIDFILE_DEFAULT); if (!pptp_delegate) { /* NOTE: remote then local, reason can be seen at the end of processIPStr */ /* grab the remoteip string from the config file */ if (read_config_file(configFile, REMOTEIP_KEYWORD, tmp) <= 0) { /* use "smart" defaults */ strlcpy(tmp, DEFAULT_REMOTE_IP_LIST, sizeof(tmp)); } processIPStr(REMOTE, tmp); /* grab the localip string from the config file */ if (read_config_file(configFile, LOCALIP_KEYWORD, tmp) <= 0) { /* use "smart" defaults */ strlcpy(tmp, DEFAULT_LOCAL_IP_LIST, sizeof(tmp)); } processIPStr(LOCAL, tmp); } free(configFile); /* if not yet set, adopt default PPP binary path */ if (!ppp_binary) ppp_binary = strdup(PPP_BINARY); /* check that the PPP binary is executable */ if (access(ppp_binary, X_OK) < 0) { syslog(LOG_ERR, "MGR: PPP binary %s not executable", ppp_binary); return 1; } /* check that the PPP options file is readable */ if (pppdoptstr && access(pppdoptstr, R_OK) < 0) { syslog(LOG_ERR, "MGR: PPP options file %s not readable", pppdoptstr); return 1; } #ifdef BCRELAY /* check that the bcrelay binary is executable */ if (bcrelay && access(BCRELAY_BIN, X_OK) < 0) { syslog(LOG_ERR, "MGR: bcrelay binary %s not executable", BCRELAY_BIN); return 1; } #endif if (!foreground) { #if HAVE_DAEMON closelog(); freopen("/dev/null", "r", stdin); daemon(0, 0); /* returns to child only */ /* pid will have changed */ openlog("pptpd", LOG_PID, PPTP_FACILITY); #else /* !HAVE_DAEMON */ my_daemon(argc, argv); /* returns to child if !HAVE_FORK * never returns if HAVE_FORK (re-execs with -f) */ #endif } #ifdef BCRELAY if (bcrelay) { syslog(LOG_DEBUG, "CTRL: BCrelay incoming interface is %s", bcrelay); /* Launch BCrelay */ #ifndef HAVE_FORK switch(bcrelayfork = vfork()){ #else switch(bcrelayfork = fork()){ #endif case -1: /* fork() error */ syslog(LOG_ERR, "CTRL: Error forking to exec bcrelay"); _exit(1); case 0: /* child */ syslog(LOG_DEBUG, "CTRL (BCrelay Launcher): Launching BCrelay with pid %i", bcrelayfork); launch_bcrelay(); syslog(LOG_ERR, "CTRL (BCrelay Launcher): Failed to launch BCrelay."); _exit(1); } } /* End bcrelay */ #endif #ifdef CONFIG_NETtel /* turn the NETtel VPN LED on */ ledman_cmd(LEDMAN_CMD_ON, LEDMAN_VPN); #endif /* after we have our final pid... */ log_pid(pid_file); /* manage connections until SIGTERM */ pptp_manager(argc, argv); #ifdef BCRELAY if (bcrelayfork > 0) { syslog(LOG_DEBUG, "CTRL: Closing child BCrelay with pid %i", bcrelayfork); kill(bcrelayfork, SIGTERM); } #endif slot_free(); return 0; } static void log_pid(char *pid_file) { FILE *f; pid_t pid; pid = getpid(); if ((f = fopen(pid_file, "w")) == NULL) { syslog(LOG_ERR, "PPTPD: failed to open(%s), errno=%d\n", pid_file, errno); return; } fprintf(f, "%d\n", pid); fclose(f); } #ifndef HAVE_DAEMON static void my_daemon(int argc, char **argv) { #ifndef HAVE_FORK /* need to use vfork - eg, uClinux */ char **new_argv; int pid; extern char **environ; int fdr; new_argv = malloc((argc + 2) * sizeof(char **)); fdr = open("/dev/null", O_RDONLY); syslog(LOG_INFO, "MGR: Option parse OK, re-execing as daemon"); fflush(stderr); if ((pid = vfork()) == 0) { if (fdr != 0) { dup2(fdr, 0); close(fdr); } SETSIDPGRP(); chdir("/"); umask(0); memcpy(new_argv + 1, argv, (argc + 1) * sizeof(char **)); new_argv[0] = PPTPD_BIN; new_argv[1] = "-f"; execve(PPTPD_BIN, new_argv, environ); _exit(1); } else if (pid > 0) { exit(0); } else { syslog_perror("vfork"); exit(1); } #else int pid; closelog(); if ((pid = fork()) < 0) { syslog_perror("fork"); exit(1); } else if (pid) exit(0); freopen("/dev/null", "r", stdin); SETSIDPGRP(); chdir("/"); umask(0); /* pid will have changed */ openlog("pptpd", LOG_PID, PPTP_FACILITY); #endif } #endif /* added for hostname/address lookup -tmk * returns NULL if not a valid hostname */ static char *lookup(char *hostname) { struct hostent *ent; struct in_addr hst_addr; /* Try to parse IP directly */ if (inet_addr(hostname) != -1) return hostname; /* Else lookup hostname, return NULL if it fails */ if ((ent = gethostbyname(hostname)) == NULL) return NULL; /* That worked, print it back as a dotted quad. */ memcpy(&hst_addr.s_addr, ent->h_addr, ent->h_length); return inet_ntoa(hst_addr); } #define DEBUG_IP_PARSER 0 /* Return the address or NULL if not valid */ static char *validip(char *hostname) { /* Try to parse IP directly */ if (inet_addr(hostname) != -1) return hostname; else return NULL; } /* Check if it's a valid IP range */ static int isIpRange(char *str) { int dashes = 0; int dots = 0; #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Checking if %s is a valid IP range", str); #endif do { if (*str == '-') dashes++; else if (*str == '.') dots++; else if (!strchr("0123456789", *str)) { #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Not an IP range: character %c is not valid", *str); #endif return 0; } } while (*++str); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Dashes = %d (wanted: 1), Dots = %d (wanted: 4)", dashes, dots); #endif return (dashes == 1 && dots == 3); } /* process a type 0 (LOCAL) or type 1 (REMOTE) IP string */ static void processIPStr(int type, char *ipstr) { int pos; char *tmpstr; /* char tmpstr2[20]; xxx.xxx.xxx.xxx-xxx (largest we can get) */ char tmpstr2[128]; /* allow hostnames */ char *tmpstr3; char tmpstr5[16]; char *tmpstr6; char *tmpstr7; int num; char ipa[8]; /* xxx-xxx (largest we can get) */ char ipb[8]; char ipc[8]; char ipd[8]; char ip_pre[13]; /* xxx.xxx.xxx. (largest we can get) */ char ip_post[13]; char ipl[4]; char ipu[4]; int bail = FALSE; /* so we know when to stop formatting the ip line */ int lower, upper, n; num = 0; while (!bail) { if ((tmpstr = strchr(ipstr, ',')) == NULL) { /* last (or only) entry reached */ strlcpy(tmpstr2, ipstr, sizeof(tmpstr2)); bail = TRUE; } else { pos = tmpstr - ipstr; ipstr[pos] = '\0'; strlcpy(tmpstr2, ipstr, sizeof(tmpstr2)); ipstr = tmpstr + 1; } #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Parsing segment: %s", tmpstr2); #endif if (!isIpRange(tmpstr2)) { /* We got a normal IP * Check if the IP address is valid, use it if so */ if ((tmpstr7 = lookup(tmpstr2)) == NULL) { syslog(LOG_ERR, "MGR: Bad IP address (%s) in config file!", tmpstr2); exit(1); } if (num == pptp_connections) { syslog(LOG_WARNING, "MGR: connections limit (%d) reached, extra IP addresses ignored", pptp_connections); return; } #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Setting IP %d = %s", num, tmpstr7); #endif if (type == LOCAL) slot_set_local(num, tmpstr7); else slot_set_remote(num, tmpstr7); num++; } else { /* Got a range; * eg. 192.168.0.234-238 * or (thanx Kev! :-).. i thought i was finished :-) * 192.168-178.1.231 */ /* lose the "."'s */ while ((tmpstr3 = strchr(tmpstr2, '.')) != NULL) { pos = tmpstr3 - tmpstr2; tmpstr2[pos] = ' '; } if ((tmpstr3 = strchr(tmpstr2, '-')) == NULL || strchr(tmpstr3 + 1, '-') != NULL) { syslog(LOG_ERR, "MGR: Confused in IP parse routines (multiple hyphens)"); continue; } /* should be left with "192 168 0 234-238" * or 192 168-178 1 231 */ sscanf(tmpstr2, "%7s %7s %7s %7s", ipa, ipb, ipc, ipd); if ((tmpstr6 = strchr(ipd, '-')) != NULL) { pos = tmpstr6 - ipd; ipd[pos] = ' '; sscanf(ipd, "%3s %3s", ipl, ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: (lower upper) = (%s %s)", ipl, ipu); #endif lower = atoi(ipl); upper = atoi(ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Range = %d to %d on 4th segment", lower, upper); #endif sprintf(ip_pre, "%.3s.%.3s.%.3s.", ipa, ipb, ipc); ip_post[0] = '\0'; #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Pre = %s Post = %s", ip_pre, ip_post); #endif } else if ((tmpstr6 = strchr(ipc, '-')) != NULL) { pos = tmpstr6 - ipc; ipc[pos] = ' '; sscanf(ipc, "%3s %3s", ipl, ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: (lower upper) = (%s %s)", ipl, ipu); #endif lower = atoi(ipl); upper = atoi(ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Range = %d to %d on 3rd segment", lower, upper); #endif sprintf(ip_pre, "%.3s.%.3s.", ipa, ipb); sprintf(ip_post, ".%.3s", ipd); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Pre = %s Post = %s", ip_pre, ip_post); #endif } else if ((tmpstr6 = strchr(ipb, '-')) != NULL) { pos = tmpstr6 - ipb; ipb[pos] = ' '; sscanf(ipb, "%3s %3s", ipl, ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: (lower upper) = (%s %s)", ipl, ipu); #endif lower = atoi(ipl); upper = atoi(ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Range = %d to %d on 2nd segment", lower, upper); #endif sprintf(ip_pre, "%.3s.", ipa); sprintf(ip_post, ".%.3s.%.3s", ipc, ipd); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Pre = %s Post = %s", ip_pre, ip_post); #endif } else if ((tmpstr6 = strchr(ipa, '-')) != NULL) { pos = tmpstr6 - ipa; ipa[pos] = ' '; sscanf(ipa, "%3s %3s", ipl, ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: (lower upper) = (%s %s)", ipl, ipu); #endif lower = atoi(ipl); upper = atoi(ipu); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Range = %d to %d on 1st segment", lower, upper); #endif ip_pre[0] = '\0'; sprintf(ip_post, ".%.3s.%.3s.%.3s", ipb, ipc, ipd); #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Pre = %s Post = %s", ip_pre, ip_post); #endif } else { syslog(LOG_ERR, "MGR: Confused in IP parse routines (lost hyphen)"); continue; } for (n = lower; n <= upper; n++) { sprintf(tmpstr5, "%s%d%s", ip_pre, n, ip_post); /* Check if the ip address is valid */ if ((tmpstr7 = validip(tmpstr5)) == NULL) { syslog(LOG_ERR, "MGR: Bad IP address (%s) in config file!", tmpstr5); exit(1); } if (num == pptp_connections) { syslog(LOG_WARNING, "MGR: connections limit (%d) reached, extra IP addresses ignored", pptp_connections); return; } #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Setting IP %d = %s", num, tmpstr7); #endif if (type == LOCAL) slot_set_local(num, tmpstr7); else slot_set_remote(num, tmpstr7); num++; } } } if (num == 1 && type == LOCAL && pptp_connections > 1) { #if DEBUG_IP_PARSER syslog(LOG_DEBUG, "MGR: Setting all %d local IPs to %s", pptp_connections, slot_get_local(0)); #endif for (n = 1; n < pptp_connections; n++) slot_set_local(n, slot_get_local(0)); } else if (pptp_connections > num) { syslog(LOG_INFO, "MGR: Maximum of %d connections reduced to %d, not enough IP addresses given", pptp_connections, num); pptp_connections = num; } } #ifdef BCRELAY /* launch_bcrelay * Launches broadcast relay. Broadcast relay is responsible for relaying broadcasts to the clients * retn: 0 on success, -1 on failure. */ static void launch_bcrelay() { char *bcrelay_argv[8]; int an = 0; if (bcrelay) { syslog(LOG_DEBUG, "MGR: BCrelay incoming interface is %s", bcrelay); syslog(LOG_DEBUG, "MGR: BCrelay outgoing interface is regexp ppp[0-9].*"); bcrelay_argv[an++] = BCRELAY_BIN; bcrelay_argv[an++] = "-i"; bcrelay_argv[an++] = bcrelay; bcrelay_argv[an++] = "-o"; bcrelay_argv[an++] = "ppp[0-9].*"; if (!pptp_debug) { bcrelay_argv[an++] = "-n"; } bcrelay_argv[an++] = NULL; execvp(bcrelay_argv[0], bcrelay_argv); } } #endif