2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/usr.sbin/ppp/main.c,v 1.167.2.8 2002/09/01 02:12:28 brian Exp $
31 #include <sys/param.h>
32 #include <netinet/in.h>
33 #include <netinet/in_systm.h>
34 #include <netinet/ip.h>
36 #include <sys/socket.h>
37 #include <net/route.h>
73 #include "throughput.h"
74 #include "slcompress.h"
78 #include "descriptor.h"
101 #define O_NONBLOCK O_NDELAY
105 static void DoLoop(struct bundle *);
106 static void TerminalStop(int);
108 static struct bundle *SignalBundle;
109 static struct prompt *SignalPrompt;
114 SignalBundle->CleaningUp = 1;
115 bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
119 AbortProgram(int excode)
122 server_Close(SignalBundle);
123 log_Printf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
125 bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
126 bundle_Destroy(SignalBundle);
133 CloseConnection(int signo)
135 /* NOTE, these are manual, we've done a setsid() */
136 sig_signal(SIGINT, SIG_IGN);
137 log_Printf(LogPHASE, "Caught signal %d, abort connection(s)\n", signo);
138 bundle_Down(SignalBundle, CLOSE_STAYDOWN);
139 sig_signal(SIGINT, CloseConnection);
143 CloseSession(int signo)
145 log_Printf(LogPHASE, "Signal %d, terminate.\n", signo);
149 static pid_t BGPid = 0;
154 signal(signo, SIG_IGN);
155 log_Printf(LogPHASE, "Parent: Signal %d\n", signo);
160 TerminalCont(int signo __unused)
162 signal(SIGCONT, SIG_DFL);
163 prompt_Continue(SignalPrompt);
167 TerminalStop(int signo __unused)
169 prompt_Suspend(SignalPrompt);
170 signal(SIGCONT, TerminalCont);
175 BringDownServer(int signo __unused)
177 /* Drops all child prompts too ! */
178 if (server_Close(SignalBundle))
179 log_Printf(LogPHASE, "Closed server socket\n");
183 RestartServer(int signo __unused)
185 /* Drops all child prompts and re-opens the socket */
186 server_Reopen(SignalBundle);
192 fprintf(stderr, "usage: ppp [-auto | -foreground | -background | -direct |"
193 " -dedicated | -ddial | -interactive]"
197 " [-quiet] [-unit N] [system ...]\n");
210 ProcessArgs(int argc, char **argv, struct switches *sw)
212 int optc, newmode, arg;
216 memset(sw, '\0', sizeof *sw);
217 sw->mode = PHYS_INTERACTIVE;
220 for (arg = 1; arg < argc && *argv[arg] == '-'; arg++, optc++) {
222 newmode = Nam2mode(cp);
225 if (strcmp(cp, "nat") == 0) {
227 log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
231 optc--; /* this option isn't exclusive */
232 } else if (strcmp(cp, "alias") == 0) {
234 log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
235 fprintf(stderr, "%s ignored: NAT is compiled out\n", argv[arg]);
237 log_Printf(LogWARN, "%s is deprecated\n", argv[arg]);
238 fprintf(stderr, "%s is deprecated\n", argv[arg]);
241 optc--; /* this option isn't exclusive */
242 } else if (strncmp(cp, "unit", 4) == 0) {
243 optc--; /* this option isn't exclusive */
245 optc--; /* nor is the argument */
247 fprintf(stderr, "-unit: Expected unit number\n");
250 sw->unit = atoi(argv[arg]);
252 sw->unit = atoi(cp + 4);
253 } else if (strcmp(cp, "quiet") == 0) {
255 optc--; /* this option isn't exclusive */
266 if (newmode == PHYS_FOREGROUND)
272 fprintf(stderr, "You may specify only one mode.\n");
276 if (sw->mode == PHYS_AUTO && arg == argc) {
277 fprintf(stderr, "A system must be specified in auto mode.\n");
281 return arg; /* Don't SetLabel yet ! */
285 CheckLabel(const char *label, struct prompt *prompt, int mode)
289 if ((err = system_IsValid(label, prompt, mode)) != NULL) {
290 fprintf(stderr, "%s: %s\n", label, err);
291 if (mode == PHYS_DIRECT)
292 log_Printf(LogWARN, "Label %s rejected -direct connection: %s\n",
301 main(int argc, char **argv)
304 const char *lastlabel;
305 int arg, holdfd[3], label;
307 struct bundle *bundle;
308 struct prompt *prompt;
314 * We open 3 descriptors to ensure that STDIN_FILENO, STDOUT_FILENO and
315 * STDERR_FILENO are always open. These are closed before DoLoop(),
316 * but *after* we've avoided the possibility of erroneously closing
317 * an important descriptor with close(STD{IN,OUT,ERR}_FILENO).
319 if ((holdfd[0] = open(_PATH_DEVNULL, O_RDWR)) == -1) {
320 fprintf(stderr, "Cannot open %s !\n", _PATH_DEVNULL);
323 for (f = 1; f < NELEM(holdfd); f++)
324 holdfd[f] = dup(holdfd[0]);
326 name = strrchr(argv[0], '/');
327 log_Open(name ? name + 1 : argv[0]);
332 label = ProcessArgs(argc, argv, &sw);
335 * A FreeBSD & OpenBSD hack to dodge a bug in the tty driver that drops
336 * output occasionally.... I must find the real reason some time. To
337 * display the dodgy behaviour, comment out this bit, make yourself a large
338 * routing table and then run ppp in interactive mode. The `show route'
339 * command will drop chunks of data !!!
341 if (sw.mode == PHYS_INTERACTIVE) {
343 if (open(_PATH_TTY, O_RDONLY) != STDIN_FILENO) {
344 fprintf(stderr, "Cannot open %s for input !\n", _PATH_TTY);
349 /* Allow output for the moment (except in direct mode) */
350 if (sw.mode == PHYS_DIRECT)
353 SignalPrompt = prompt = prompt_Create(NULL, NULL, PROMPT_STD);
356 if (ID0realuid() != 0) {
357 char conf[200], *ptr;
359 snprintf(conf, sizeof conf, "%s/%s", PPP_CONFDIR, CONFFILE);
363 if (stat(conf, &sb) == 0 && sb.st_mode & S_IWOTH) {
364 log_Printf(LogALERT, "ppp: Access violation: Please protect %s\n",
368 ptr = conf + strlen(conf)-2;
369 while (ptr > conf && *ptr != '/')
371 } while (ptr >= conf);
375 for (arg = label; arg < argc; arg++)
376 CheckLabel(argv[arg], prompt, sw.mode);
378 CheckLabel("default", prompt, sw.mode);
381 prompt_Printf(prompt, "Working in %s mode\n", mode2Nam(sw.mode));
383 if ((bundle = bundle_Create(TUN_PREFIX, sw.mode, sw.unit)) == NULL)
386 /* NOTE: We may now have changed argv[1] via a ``set proctitle'' */
389 prompt->bundle = bundle; /* couldn't do it earlier */
391 prompt_Printf(prompt, "Using interface: %s\n", bundle->iface->name);
393 SignalBundle = bundle;
394 bundle->NatEnabled = sw.nat;
396 bundle->cfg.opt |= OPT_IFACEALIAS;
398 if (system_Select(bundle, "default", CONFFILE, prompt, NULL) < 0)
399 prompt_Printf(prompt, "Warning: No default entry found in config file.\n");
401 sig_signal(SIGHUP, CloseSession);
402 sig_signal(SIGTERM, CloseSession);
403 sig_signal(SIGINT, CloseConnection);
404 sig_signal(SIGQUIT, CloseSession);
405 sig_signal(SIGALRM, SIG_IGN);
406 signal(SIGPIPE, SIG_IGN);
408 if (sw.mode == PHYS_INTERACTIVE)
409 sig_signal(SIGTSTP, TerminalStop);
411 sig_signal(SIGUSR1, RestartServer);
412 sig_signal(SIGUSR2, BringDownServer);
414 lastlabel = argv[argc - 1];
415 for (arg = label; arg < argc; arg++) {
416 /* In case we use LABEL or ``set enddisc label'' */
417 bundle_SetLabel(bundle, lastlabel);
418 system_Select(bundle, argv[arg], CONFFILE, prompt, NULL);
422 /* In case the last label did a ``load'' */
423 bundle_SetLabel(bundle, lastlabel);
425 if (sw.mode == PHYS_AUTO &&
426 ncprange_family(&bundle->ncp.ipcp.cfg.peer_range) == AF_UNSPEC) {
427 prompt_Printf(prompt, "You must ``set ifaddr'' with a peer address "
429 AbortProgram(EX_START);
432 if (sw.mode != PHYS_INTERACTIVE) {
433 if (sw.mode != PHYS_DIRECT) {
438 if (sw.mode == PHYS_BACKGROUND && pipe(bgpipe)) {
439 log_Printf(LogERROR, "pipe: %s\n", strerror(errno));
440 AbortProgram(EX_SOCK);
445 log_Printf(LogERROR, "fork: %s\n", strerror(errno));
446 AbortProgram(EX_SOCK);
453 if (sw.mode == PHYS_BACKGROUND) {
456 /* If we get a signal, kill the child */
457 signal(SIGHUP, KillChild);
458 signal(SIGTERM, KillChild);
459 signal(SIGINT, KillChild);
460 signal(SIGQUIT, KillChild);
462 /* Wait for our child to close its pipe before we exit */
463 while ((ret = read(bgpipe[0], &c, 1)) == 1) {
467 prompt_Printf(prompt, "PPP enabled\n");
468 log_Printf(LogPHASE, "Parent: PPP enabled\n");
473 prompt_Printf(prompt, "Attempting redial\n");
477 prompt_Printf(prompt, "Attempting reconnect\n");
480 prompt_Printf(prompt, "Child failed (%s)\n",
482 log_Printf(LogPHASE, "Parent: Child failed (%s)\n",
488 prompt_Printf(prompt, "Child exit, no status.\n");
489 log_Printf(LogPHASE, "Parent: Child exit, no status.\n");
494 } else if (sw.mode == PHYS_BACKGROUND) {
496 bundle->notify.fd = bgpipe[1];
499 bundle_ChangedPID(bundle);
500 bundle_LockTun(bundle); /* we have a new pid */
503 /* -auto, -dedicated, -ddial, -foreground & -background */
504 prompt_Destroy(prompt, 0);
505 close(STDOUT_FILENO);
506 close(STDERR_FILENO);
511 /* -direct - STDIN_FILENO gets used by physical_Open */
512 prompt_TtyInit(NULL);
513 close(STDOUT_FILENO);
514 close(STDERR_FILENO);
518 close(STDERR_FILENO);
519 prompt_TtyInit(prompt);
520 prompt_TtyCommandMode(prompt);
521 prompt_Required(prompt);
524 /* We can get rid of these now */
525 for (f = 0; f < NELEM(holdfd); f++)
528 log_Printf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(sw.mode));
530 AbortProgram(EX_NORMAL);
536 DoLoop(struct bundle *bundle)
538 fd_set *rfds, *wfds, *efds;
539 int i, nfds, nothing_done;
541 if ((rfds = mkfdset()) == NULL) {
542 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
546 if ((wfds = mkfdset()) == NULL) {
547 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
552 if ((efds = mkfdset()) == NULL) {
553 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
559 for (; !bundle_IsDead(bundle); bundle_CleanDatalinks(bundle)) {
565 /* All our datalinks, the tun device and the MP socket */
566 descriptor_UpdateSet(&bundle->desc, rfds, wfds, efds, &nfds);
568 /* All our prompts and the diagnostic socket */
569 descriptor_UpdateSet(&server.desc, rfds, NULL, NULL, &nfds);
571 bundle_CleanDatalinks(bundle);
572 if (bundle_IsDead(bundle))
573 /* Don't select - we'll be here forever */
577 * It's possible that we've had a signal since we last checked. If
578 * we don't check again before calling select(), we may end up stuck
579 * after having missed the event.... sig_Handle() tries to be as
580 * quick as possible if nothing is likely to have happened.
581 * This is only really likely if we block in open(... O_NONBLOCK)
582 * which will happen with a misconfigured device.
587 i = select(nfds, rfds, wfds, efds, NULL);
589 if (i < 0 && errno != EINTR) {
590 log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
591 if (log_IsKept(LogTIMER)) {
594 for (i = 0; i <= nfds; i++) {
595 if (FD_ISSET(i, rfds)) {
596 log_Printf(LogTIMER, "Read set contains %d\n", i);
598 t.tv_sec = t.tv_usec = 0;
599 if (select(nfds, rfds, wfds, efds, &t) != -1) {
600 log_Printf(LogTIMER, "The culprit !\n");
604 if (FD_ISSET(i, wfds)) {
605 log_Printf(LogTIMER, "Write set contains %d\n", i);
607 t.tv_sec = t.tv_usec = 0;
608 if (select(nfds, rfds, wfds, efds, &t) != -1) {
609 log_Printf(LogTIMER, "The culprit !\n");
613 if (FD_ISSET(i, efds)) {
614 log_Printf(LogTIMER, "Error set contains %d\n", i);
616 t.tv_sec = t.tv_usec = 0;
617 if (select(nfds, rfds, wfds, efds, &t) != -1) {
618 log_Printf(LogTIMER, "The culprit !\n");
627 log_Printf(LogTIMER, "Select returns %d\n", i);
634 for (i = 0; i <= nfds; i++)
635 if (FD_ISSET(i, efds)) {
636 log_Printf(LogPHASE, "Exception detected on descriptor %d\n", i);
637 /* We deal gracefully with link descriptor exceptions */
638 if (!bundle_Exception(bundle, i)) {
639 log_Printf(LogERROR, "Exception cannot be handled !\n");
649 if (descriptor_IsSet(&server.desc, rfds)) {
650 descriptor_Read(&server.desc, bundle, rfds);
654 if (descriptor_IsSet(&bundle->desc, rfds)) {
655 descriptor_Read(&bundle->desc, bundle, rfds);
659 if (descriptor_IsSet(&bundle->desc, wfds))
660 if (descriptor_Write(&bundle->desc, bundle, wfds) <= 0 && nothing_done) {
662 * This is disastrous. The OS has told us that something is
663 * writable, and all our write()s have failed. Rather than
664 * going back immediately to do our UpdateSet()s and select(),
665 * we sleep for a bit to avoid gobbling up all cpu time.
671 select(0, NULL, NULL, NULL, &t);
675 log_Printf(LogDEBUG, "DoLoop done.\n");