/*- * Copyright (c) 1996 - 2001 Brian Somers * based on work by Toshiharu OHNO * Internet Initiative Japan, Inc (IIJ) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef NONAT #ifdef LOCALNAT #include "alias.h" #else #include #endif #endif #include "layer.h" #include "probe.h" #include "mbuf.h" #include "log.h" #include "defs.h" #include "id.h" #include "timer.h" #include "fsm.h" #include "lqr.h" #include "hdlc.h" #include "lcp.h" #include "ccp.h" #include "iplist.h" #include "throughput.h" #include "slcompress.h" #include "ncpaddr.h" #include "ipcp.h" #include "filter.h" #include "descriptor.h" #include "link.h" #include "mp.h" #ifndef NORADIUS #include "radius.h" #endif #include "ipv6cp.h" #include "ncp.h" #include "bundle.h" #include "auth.h" #include "systems.h" #include "sig.h" #include "main.h" #include "server.h" #include "prompt.h" #include "chat.h" #include "chap.h" #include "cbcp.h" #include "datalink.h" #include "iface.h" #ifndef O_NONBLOCK #ifdef O_NDELAY #define O_NONBLOCK O_NDELAY #endif #endif static void DoLoop(struct bundle *); static void TerminalStop(int); static struct bundle *SignalBundle; static struct prompt *SignalPrompt; struct libalias *la; void Cleanup() { SignalBundle->CleaningUp = 1; bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN); } void AbortProgram(int excode) { if (SignalBundle) server_Close(SignalBundle); log_Printf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode)); if (SignalBundle) { bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN); bundle_Destroy(SignalBundle); } log_Close(); exit(excode); } static void CloseConnection(int signo) { /* NOTE, these are manual, we've done a setsid() */ sig_signal(SIGINT, SIG_IGN); log_Printf(LogPHASE, "Caught signal %d, abort connection(s)\n", signo); bundle_Down(SignalBundle, CLOSE_STAYDOWN); sig_signal(SIGINT, CloseConnection); } static void CloseSession(int signo) { log_Printf(LogPHASE, "Signal %d, terminate.\n", signo); Cleanup(); } static pid_t BGPid = 0; static void KillChild(int signo) { signal(signo, SIG_IGN); log_Printf(LogPHASE, "Parent: Signal %d\n", signo); kill(BGPid, SIGINT); } static void TerminalCont(int signo __unused) { signal(SIGCONT, SIG_DFL); prompt_Continue(SignalPrompt); } static void TerminalStop(int signo __unused) { prompt_Suspend(SignalPrompt); signal(SIGCONT, TerminalCont); raise(SIGSTOP); } static void BringDownServer(int signo __unused) { /* Drops all child prompts too ! */ if (server_Close(SignalBundle)) log_Printf(LogPHASE, "Closed server socket\n"); } static void RestartServer(int signo __unused) { /* Drops all child prompts and re-opens the socket */ server_Reopen(SignalBundle); } static void Usage(void) { fprintf(stderr, "usage: ppp [-auto | -foreground | -background | -direct |" " -dedicated | -ddial | -interactive]" #ifndef NONAT " [-nat]" #endif " [-quiet] [-unit N] [system ...]\n"); exit(EX_START); } struct switches { unsigned nat : 1; unsigned fg : 1; unsigned quiet : 1; int mode; int unit; }; static int ProcessArgs(int argc, char **argv, struct switches *sw) { int optc, newmode, arg; char *cp; optc = 0; memset(sw, '\0', sizeof *sw); sw->mode = PHYS_INTERACTIVE; sw->unit = -1; for (arg = 1; arg < argc && *argv[arg] == '-'; arg++, optc++) { cp = argv[arg] + 1; newmode = Nam2mode(cp); switch (newmode) { case PHYS_NONE: if (strcmp(cp, "nat") == 0) { #ifdef NONAT log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]); #else sw->nat = 1; #endif optc--; /* this option isn't exclusive */ } else if (strcmp(cp, "alias") == 0) { #ifdef NONAT log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]); fprintf(stderr, "%s ignored: NAT is compiled out\n", argv[arg]); #else log_Printf(LogWARN, "%s is deprecated\n", argv[arg]); fprintf(stderr, "%s is deprecated\n", argv[arg]); sw->nat = 1; #endif optc--; /* this option isn't exclusive */ } else if (strncmp(cp, "unit", 4) == 0) { optc--; /* this option isn't exclusive */ if (cp[4] == '\0') { optc--; /* nor is the argument */ if (++arg == argc) { fprintf(stderr, "-unit: Expected unit number\n"); Usage(); } else sw->unit = atoi(argv[arg]); } else sw->unit = atoi(cp + 4); } else if (strcmp(cp, "quiet") == 0) { sw->quiet = 1; optc--; /* this option isn't exclusive */ } else Usage(); break; case PHYS_ALL: Usage(); break; default: sw->mode = newmode; if (newmode == PHYS_FOREGROUND) sw->fg = 1; } } if (optc > 1) { fprintf(stderr, "You may specify only one mode.\n"); exit(EX_START); } if (sw->mode == PHYS_AUTO && arg == argc) { fprintf(stderr, "A system must be specified in auto mode.\n"); exit(EX_START); } return arg; /* Don't SetLabel yet ! */ } static void CheckLabel(const char *label, struct prompt *prompt, int mode) { const char *err; if ((err = system_IsValid(label, prompt, mode)) != NULL) { fprintf(stderr, "%s: %s\n", label, err); if (mode == PHYS_DIRECT) log_Printf(LogWARN, "Label %s rejected -direct connection: %s\n", label, err); log_Close(); exit(1); } } int main(int argc, char **argv) { char *name; const char *lastlabel; int arg, holdfd[3], label; unsigned f; struct bundle *bundle; struct prompt *prompt; struct switches sw; probe_Init(); /* * We open 3 descriptors to ensure that STDIN_FILENO, STDOUT_FILENO and * STDERR_FILENO are always open. These are closed before DoLoop(), * but *after* we've avoided the possibility of erroneously closing * an important descriptor with close(STD{IN,OUT,ERR}_FILENO). */ if ((holdfd[0] = open(_PATH_DEVNULL, O_RDWR)) == -1) { fprintf(stderr, "Cannot open %s !\n", _PATH_DEVNULL); return 2; } for (f = 1; f < sizeof holdfd / sizeof *holdfd; f++) holdfd[f] = dup(holdfd[0]); name = strrchr(argv[0], '/'); log_Open(name ? name + 1 : argv[0]); #ifndef NONAT la = LibAliasInit(NULL); #endif label = ProcessArgs(argc, argv, &sw); /* * A FreeBSD & OpenBSD hack to dodge a bug in the tty driver that drops * output occasionally.... I must find the real reason some time. To * display the dodgy behaviour, comment out this bit, make yourself a large * routing table and then run ppp in interactive mode. The `show route' * command will drop chunks of data !!! */ if (sw.mode == PHYS_INTERACTIVE) { close(STDIN_FILENO); if (open(_PATH_TTY, O_RDONLY) != STDIN_FILENO) { fprintf(stderr, "Cannot open %s for input !\n", _PATH_TTY); return 2; } } /* Allow output for the moment (except in direct mode) */ if (sw.mode == PHYS_DIRECT) prompt = NULL; else SignalPrompt = prompt = prompt_Create(NULL, NULL, PROMPT_STD); ID0init(); if (ID0realuid() != 0) { char conf[200], *ptr; snprintf(conf, sizeof conf, "%s/%s", PPP_CONFDIR, CONFFILE); do { struct stat sb; if (stat(conf, &sb) == 0 && sb.st_mode & S_IWOTH) { log_Printf(LogALERT, "ppp: Access violation: Please protect %s\n", conf); return -1; } ptr = conf + strlen(conf)-2; while (ptr > conf && *ptr != '/') *ptr-- = '\0'; } while (ptr >= conf); } if (label < argc) for (arg = label; arg < argc; arg++) CheckLabel(argv[arg], prompt, sw.mode); else CheckLabel("default", prompt, sw.mode); if (!sw.quiet) prompt_Printf(prompt, "Working in %s mode\n", mode2Nam(sw.mode)); if ((bundle = bundle_Create(TUN_PREFIX, sw.mode, sw.unit)) == NULL) return EX_START; /* NOTE: We may now have changed argv[1] via a ``set proctitle'' */ SignalBundle = bundle; bundle->NatEnabled = sw.nat; if (sw.nat) opt_enable(bundle, OPT_IFACEALIAS); if (system_Select(bundle, "default", CONFFILE, prompt, NULL) < 0) prompt_Printf(prompt, "Warning: No default entry found in config file.\n"); sig_signal(SIGHUP, CloseSession); sig_signal(SIGTERM, CloseSession); sig_signal(SIGINT, CloseConnection); sig_signal(SIGQUIT, CloseSession); sig_signal(SIGALRM, SIG_IGN); signal(SIGPIPE, SIG_IGN); if (sw.mode == PHYS_INTERACTIVE) sig_signal(SIGTSTP, TerminalStop); sig_signal(SIGUSR1, RestartServer); sig_signal(SIGUSR2, BringDownServer); lastlabel = argv[argc - 1]; for (arg = label; arg < argc; arg++) { /* In case we use LABEL or ``set enddisc label'' */ bundle_SetLabel(bundle, lastlabel); system_Select(bundle, argv[arg], CONFFILE, prompt, NULL); } if (label < argc) /* In case the last label did a ``load'' */ bundle_SetLabel(bundle, lastlabel); if (sw.mode == PHYS_AUTO && ncprange_family(&bundle->ncp.ipcp.cfg.peer_range) == AF_UNSPEC) { prompt_Printf(prompt, "You must ``set ifaddr'' with a peer address " "in auto mode.\n"); AbortProgram(EX_START); } if (prompt) { prompt->bundle = bundle; /* couldn't do it earlier */ if (!sw.quiet) prompt_Printf(prompt, "Using interface: %s\n", bundle->iface->name); } if (sw.mode != PHYS_INTERACTIVE) { if (sw.mode != PHYS_DIRECT) { if (!sw.fg) { int bgpipe[2]; pid_t bgpid; if (sw.mode == PHYS_BACKGROUND && pipe(bgpipe)) { log_Printf(LogERROR, "pipe: %s\n", strerror(errno)); AbortProgram(EX_SOCK); } bgpid = fork(); if (bgpid == -1) { log_Printf(LogERROR, "fork: %s\n", strerror(errno)); AbortProgram(EX_SOCK); } if (bgpid) { char c = EX_NORMAL; int ret; if (sw.mode == PHYS_BACKGROUND) { close(bgpipe[1]); BGPid = bgpid; /* If we get a signal, kill the child */ signal(SIGHUP, KillChild); signal(SIGTERM, KillChild); signal(SIGINT, KillChild); signal(SIGQUIT, KillChild); /* Wait for our child to close its pipe before we exit */ while ((ret = read(bgpipe[0], &c, 1)) == 1) { switch (c) { case EX_NORMAL: if (!sw.quiet) { prompt_Printf(prompt, "PPP enabled\n"); log_Printf(LogPHASE, "Parent: PPP enabled\n"); } break; case EX_REDIAL: if (!sw.quiet) prompt_Printf(prompt, "Attempting redial\n"); continue; case EX_RECONNECT: if (!sw.quiet) prompt_Printf(prompt, "Attempting reconnect\n"); continue; default: prompt_Printf(prompt, "Child failed (%s)\n", ex_desc((int)c)); log_Printf(LogPHASE, "Parent: Child failed (%s)\n", ex_desc((int) c)); } break; } if (ret != 1) { prompt_Printf(prompt, "Child exit, no status.\n"); log_Printf(LogPHASE, "Parent: Child exit, no status.\n"); } close(bgpipe[0]); } return c; } else if (sw.mode == PHYS_BACKGROUND) { close(bgpipe[0]); bundle->notify.fd = bgpipe[1]; } bundle_ChangedPID(bundle); bundle_LockTun(bundle); /* we have a new pid */ } /* -auto, -dedicated, -ddial, -foreground & -background */ prompt_Destroy(prompt, 0); close(STDOUT_FILENO); close(STDERR_FILENO); close(STDIN_FILENO); if (!sw.fg) setsid(); } else { /* * -direct - STDIN_FILENO gets used by physical_Open. STDOUT_FILENO * *may* get used in exec/pipe mode. */ prompt_TtyInit(NULL); close(STDERR_FILENO); } } else { /* -interactive */ close(STDERR_FILENO); prompt_TtyInit(prompt); prompt_TtyCommandMode(prompt); prompt_Required(prompt); } /* We can get rid of these now */ for (f = 0; f < sizeof holdfd / sizeof *holdfd; f++) close(holdfd[f]); log_Printf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(sw.mode)); DoLoop(bundle); AbortProgram(EX_NORMAL); return EX_NORMAL; } static void DoLoop(struct bundle *bundle) { fd_set *rfds, *wfds, *efds; int i, nfds, nothing_done; if ((rfds = mkfdset()) == NULL) { log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n"); return; } if ((wfds = mkfdset()) == NULL) { log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n"); free(rfds); return; } if ((efds = mkfdset()) == NULL) { log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n"); free(rfds); free(wfds); return; } for (; !bundle_IsDead(bundle); bundle_CleanDatalinks(bundle)) { nfds = 0; zerofdset(rfds); zerofdset(wfds); zerofdset(efds); /* All our datalinks, the tun device and the MP socket */ descriptor_UpdateSet(&bundle->desc, rfds, wfds, efds, &nfds); /* All our prompts and the diagnostic socket */ descriptor_UpdateSet(&server.desc, rfds, NULL, NULL, &nfds); bundle_CleanDatalinks(bundle); if (bundle_IsDead(bundle)) /* Don't select - we'll be here forever */ break; /* * It's possible that we've had a signal since we last checked. If * we don't check again before calling select(), we may end up stuck * after having missed the event.... sig_Handle() tries to be as * quick as possible if nothing is likely to have happened. * This is only really likely if we block in open(... O_NONBLOCK) * which will happen with a misconfigured device. */ if (sig_Handle()) continue; i = select(nfds, rfds, wfds, efds, NULL); if (i < 0 && errno != EINTR) { log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno)); if (log_IsKept(LogTIMER)) { struct timeval t; for (i = 0; i <= nfds; i++) { if (FD_ISSET(i, rfds)) { log_Printf(LogTIMER, "Read set contains %d\n", i); FD_CLR(i, rfds); t.tv_sec = t.tv_usec = 0; if (select(nfds, rfds, wfds, efds, &t) != -1) { log_Printf(LogTIMER, "The culprit !\n"); break; } } if (FD_ISSET(i, wfds)) { log_Printf(LogTIMER, "Write set contains %d\n", i); FD_CLR(i, wfds); t.tv_sec = t.tv_usec = 0; if (select(nfds, rfds, wfds, efds, &t) != -1) { log_Printf(LogTIMER, "The culprit !\n"); break; } } if (FD_ISSET(i, efds)) { log_Printf(LogTIMER, "Error set contains %d\n", i); FD_CLR(i, efds); t.tv_sec = t.tv_usec = 0; if (select(nfds, rfds, wfds, efds, &t) != -1) { log_Printf(LogTIMER, "The culprit !\n"); break; } } } } break; } log_Printf(LogTIMER, "Select returns %d\n", i); sig_Handle(); if (i <= 0) continue; for (i = 0; i <= nfds; i++) if (FD_ISSET(i, efds)) { log_Printf(LogPHASE, "Exception detected on descriptor %d\n", i); /* We deal gracefully with link descriptor exceptions */ if (!bundle_Exception(bundle, i)) { log_Printf(LogERROR, "Exception cannot be handled !\n"); break; } } if (i <= nfds) break; nothing_done = 1; if (descriptor_IsSet(&server.desc, rfds)) { descriptor_Read(&server.desc, bundle, rfds); nothing_done = 0; } if (descriptor_IsSet(&bundle->desc, rfds)) { descriptor_Read(&bundle->desc, bundle, rfds); nothing_done = 0; } if (descriptor_IsSet(&bundle->desc, wfds)) if (descriptor_Write(&bundle->desc, bundle, wfds) <= 0 && nothing_done) { /* * This is disastrous. The OS has told us that something is * writable, and all our write()s have failed. Rather than * going back immediately to do our UpdateSet()s and select(), * we sleep for a bit to avoid gobbling up all cpu time. */ struct timeval t; t.tv_sec = 0; t.tv_usec = 100000; select(0, NULL, NULL, NULL, &t); } } log_Printf(LogDEBUG, "DoLoop done.\n"); }