/* * User Process PPP * * Written by Toshiharu OHNO (tony-o@iij.ad.jp) * * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the Internet Initiative Japan, Inc. The name of the * IIJ may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * $FreeBSD$ * * TODO: */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef NONAT #ifdef __FreeBSD__ #include #else #include "alias.h" #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 "ipcp.h" #include "filter.h" #include "descriptor.h" #include "link.h" #include "mp.h" #ifndef NORADIUS #include "radius.h" #endif #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 const char *ex_desc(int); static struct bundle *SignalBundle; static struct prompt *SignalPrompt; void Cleanup(int excode) { SignalBundle->CleaningUp = 1; bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN); } void AbortProgram(int excode) { server_Close(SignalBundle); log_Printf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode)); 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(EX_TERM); } 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) { signal(SIGCONT, SIG_DFL); prompt_Continue(SignalPrompt); } static void TerminalStop(int signo) { prompt_Suspend(SignalPrompt); signal(SIGCONT, TerminalCont); raise(SIGSTOP); } static void BringDownServer(int signo) { /* Drops all child prompts too ! */ server_Close(SignalBundle); } static const char * ex_desc(int ex) { static char num[12]; /* Used immediately if returned */ static const char *desc[] = { "normal", "start", "sock", "modem", "dial", "dead", "done", "reboot", "errdead", "hangup", "term", "nodial", "nologin" }; if (ex >= 0 && ex < sizeof desc / sizeof *desc) return desc[ex]; snprintf(num, sizeof num, "%d", ex); return num; } static void Usage(void) { fprintf(stderr, "Usage: ppp [-auto | -foreground | -background | -direct | -dedicated | -ddial | -interactive]" #ifndef NOALIAS " [-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 nfds, label, arg; struct bundle *bundle; struct prompt *prompt; struct switches sw; nfds = getdtablesize(); if (nfds >= FD_SETSIZE) /* * If we've got loads of file descriptors, make sure they're all * closed. If they aren't, we may end up with a seg fault when our * `fd_set's get too big when select()ing ! */ while (--nfds > 2) close(nfds); name = strrchr(argv[0], '/'); log_Open(name ? name + 1 : argv[0]); #ifndef NONAT PacketAliasInit(); #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", _PATH_PPP, 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'' */ if (prompt) { prompt->bundle = bundle; /* couldn't do it earlier */ if (!sw.quiet) prompt_Printf(prompt, "Using interface: %s\n", bundle->iface->name); } SignalBundle = bundle; bundle->NatEnabled = sw.nat; if (sw.nat) bundle->cfg.opt |= 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(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 && bundle->ncp.ipcp.cfg.peer_range.ipaddr.s_addr == INADDR_ANY) { prompt_Printf(prompt, "You must ``set ifaddr'' with a peer address " "in auto mode.\n"); AbortProgram(EX_START); } 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; 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 */ if (read(bgpipe[0], &c, 1) != 1) { prompt_Printf(prompt, "Child exit, no status.\n"); log_Printf(LogPHASE, "Parent: Child exit, no status.\n"); } else if (c == EX_NORMAL) { prompt_Printf(prompt, "PPP enabled.\n"); log_Printf(LogPHASE, "Parent: PPP enabled.\n"); } else { prompt_Printf(prompt, "Child failed (%s).\n", ex_desc((int) c)); log_Printf(LogPHASE, "Parent: Child failed (%s).\n", ex_desc((int) c)); } close(bgpipe[0]); } return c; } else if (sw.mode == PHYS_BACKGROUND) { close(bgpipe[0]); bundle->notify.fd = bgpipe[1]; } 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 */ prompt_TtyInit(NULL); close(STDOUT_FILENO); close(STDERR_FILENO); } } else { /* -interactive */ close(STDERR_FILENO); prompt_TtyInit(prompt); prompt_TtyCommandMode(prompt); prompt_Required(prompt); } 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; struct probe probe; probe_Init(&probe); for (; !bundle_IsDead(bundle); bundle_CleanDatalinks(bundle)) { nfds = 0; FD_ZERO(&rfds); FD_ZERO(&wfds); FD_ZERO(&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); 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) && nothing_done) { /* * This is disasterous. 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"); }