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
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;
115 SignalBundle->CleaningUp = 1;
116 bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
120 AbortProgram(int excode)
123 server_Close(SignalBundle);
124 log_Printf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
126 bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
127 bundle_Destroy(SignalBundle);
134 CloseConnection(int signo)
136 /* NOTE, these are manual, we've done a setsid() */
137 sig_signal(SIGINT, SIG_IGN);
138 log_Printf(LogPHASE, "Caught signal %d, abort connection(s)\n", signo);
139 bundle_Down(SignalBundle, CLOSE_STAYDOWN);
140 sig_signal(SIGINT, CloseConnection);
144 CloseSession(int signo)
146 log_Printf(LogPHASE, "Signal %d, terminate.\n", signo);
150 static pid_t BGPid = 0;
155 signal(signo, SIG_IGN);
156 log_Printf(LogPHASE, "Parent: Signal %d\n", signo);
161 TerminalCont(int signo __unused)
163 signal(SIGCONT, SIG_DFL);
164 prompt_Continue(SignalPrompt);
168 TerminalStop(int signo __unused)
170 prompt_Suspend(SignalPrompt);
171 signal(SIGCONT, TerminalCont);
176 BringDownServer(int signo __unused)
178 /* Drops all child prompts too ! */
179 if (server_Close(SignalBundle))
180 log_Printf(LogPHASE, "Closed server socket\n");
184 RestartServer(int signo __unused)
186 /* Drops all child prompts and re-opens the socket */
187 server_Reopen(SignalBundle);
193 fprintf(stderr, "usage: ppp [-auto | -foreground | -background | -direct |"
194 " -dedicated | -ddial | -interactive]"
198 " [-quiet] [-unit N] [system ...]\n");
211 ProcessArgs(int argc, char **argv, struct switches *sw)
213 int optc, newmode, arg;
217 memset(sw, '\0', sizeof *sw);
218 sw->mode = PHYS_INTERACTIVE;
221 for (arg = 1; arg < argc && *argv[arg] == '-'; arg++, optc++) {
223 newmode = Nam2mode(cp);
226 if (strcmp(cp, "nat") == 0) {
228 log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
232 optc--; /* this option isn't exclusive */
233 } else if (strcmp(cp, "alias") == 0) {
235 log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
236 fprintf(stderr, "%s ignored: NAT is compiled out\n", argv[arg]);
238 log_Printf(LogWARN, "%s is deprecated\n", argv[arg]);
239 fprintf(stderr, "%s is deprecated\n", argv[arg]);
242 optc--; /* this option isn't exclusive */
243 } else if (strncmp(cp, "unit", 4) == 0) {
244 optc--; /* this option isn't exclusive */
246 optc--; /* nor is the argument */
248 fprintf(stderr, "-unit: Expected unit number\n");
251 sw->unit = atoi(argv[arg]);
253 sw->unit = atoi(cp + 4);
254 } else if (strcmp(cp, "quiet") == 0) {
256 optc--; /* this option isn't exclusive */
267 if (newmode == PHYS_FOREGROUND)
273 fprintf(stderr, "You may specify only one mode.\n");
277 if (sw->mode == PHYS_AUTO && arg == argc) {
278 fprintf(stderr, "A system must be specified in auto mode.\n");
282 return arg; /* Don't SetLabel yet ! */
286 CheckLabel(const char *label, struct prompt *prompt, int mode)
290 if ((err = system_IsValid(label, prompt, mode)) != NULL) {
291 fprintf(stderr, "%s: %s\n", label, err);
292 if (mode == PHYS_DIRECT)
293 log_Printf(LogWARN, "Label %s rejected -direct connection: %s\n",
302 main(int argc, char **argv)
305 const char *lastlabel;
306 int arg, holdfd[3], label;
308 struct bundle *bundle;
309 struct prompt *prompt;
315 * We open 3 descriptors to ensure that STDIN_FILENO, STDOUT_FILENO and
316 * STDERR_FILENO are always open. These are closed before DoLoop(),
317 * but *after* we've avoided the possibility of erroneously closing
318 * an important descriptor with close(STD{IN,OUT,ERR}_FILENO).
320 if ((holdfd[0] = open(_PATH_DEVNULL, O_RDWR)) == -1) {
321 fprintf(stderr, "Cannot open %s !\n", _PATH_DEVNULL);
324 for (f = 1; f < sizeof holdfd / sizeof *holdfd; f++)
325 holdfd[f] = dup(holdfd[0]);
327 name = strrchr(argv[0], '/');
328 log_Open(name ? name + 1 : argv[0]);
331 la = LibAliasInit(NULL);
333 label = ProcessArgs(argc, argv, &sw);
336 * A FreeBSD & OpenBSD hack to dodge a bug in the tty driver that drops
337 * output occasionally.... I must find the real reason some time. To
338 * display the dodgy behaviour, comment out this bit, make yourself a large
339 * routing table and then run ppp in interactive mode. The `show route'
340 * command will drop chunks of data !!!
342 if (sw.mode == PHYS_INTERACTIVE) {
344 if (open(_PATH_TTY, O_RDONLY) != STDIN_FILENO) {
345 fprintf(stderr, "Cannot open %s for input !\n", _PATH_TTY);
350 /* Allow output for the moment (except in direct mode) */
351 if (sw.mode == PHYS_DIRECT)
354 SignalPrompt = prompt = prompt_Create(NULL, NULL, PROMPT_STD);
357 if (ID0realuid() != 0) {
358 char conf[200], *ptr;
360 snprintf(conf, sizeof conf, "%s/%s", PPP_CONFDIR, CONFFILE);
364 if (stat(conf, &sb) == 0 && sb.st_mode & S_IWOTH) {
365 log_Printf(LogALERT, "ppp: Access violation: Please protect %s\n",
369 ptr = conf + strlen(conf)-2;
370 while (ptr > conf && *ptr != '/')
372 } while (ptr >= conf);
376 for (arg = label; arg < argc; arg++)
377 CheckLabel(argv[arg], prompt, sw.mode);
379 CheckLabel("default", prompt, sw.mode);
382 prompt_Printf(prompt, "Working in %s mode\n", mode2Nam(sw.mode));
384 if ((bundle = bundle_Create(TUN_PREFIX, sw.mode, sw.unit)) == NULL)
387 /* NOTE: We may now have changed argv[1] via a ``set proctitle'' */
389 SignalBundle = bundle;
390 bundle->NatEnabled = sw.nat;
392 opt_enable(bundle, OPT_IFACEALIAS);
394 if (system_Select(bundle, "default", CONFFILE, prompt, NULL) < 0)
395 prompt_Printf(prompt, "Warning: No default entry found in config file.\n");
397 sig_signal(SIGHUP, CloseSession);
398 sig_signal(SIGTERM, CloseSession);
399 sig_signal(SIGINT, CloseConnection);
400 sig_signal(SIGQUIT, CloseSession);
401 sig_signal(SIGALRM, SIG_IGN);
402 signal(SIGPIPE, SIG_IGN);
404 if (sw.mode == PHYS_INTERACTIVE)
405 sig_signal(SIGTSTP, TerminalStop);
407 sig_signal(SIGUSR1, RestartServer);
408 sig_signal(SIGUSR2, BringDownServer);
410 lastlabel = argv[argc - 1];
411 for (arg = label; arg < argc; arg++) {
412 /* In case we use LABEL or ``set enddisc label'' */
413 bundle_SetLabel(bundle, lastlabel);
414 system_Select(bundle, argv[arg], CONFFILE, prompt, NULL);
418 /* In case the last label did a ``load'' */
419 bundle_SetLabel(bundle, lastlabel);
421 if (sw.mode == PHYS_AUTO &&
422 ncprange_family(&bundle->ncp.ipcp.cfg.peer_range) == AF_UNSPEC) {
423 prompt_Printf(prompt, "You must ``set ifaddr'' with a peer address "
425 AbortProgram(EX_START);
429 prompt->bundle = bundle; /* couldn't do it earlier */
431 prompt_Printf(prompt, "Using interface: %s\n", bundle->iface->name);
434 if (sw.mode != PHYS_INTERACTIVE) {
435 if (sw.mode != PHYS_DIRECT) {
440 if (sw.mode == PHYS_BACKGROUND && pipe(bgpipe)) {
441 log_Printf(LogERROR, "pipe: %s\n", strerror(errno));
442 AbortProgram(EX_SOCK);
447 log_Printf(LogERROR, "fork: %s\n", strerror(errno));
448 AbortProgram(EX_SOCK);
455 if (sw.mode == PHYS_BACKGROUND) {
458 /* If we get a signal, kill the child */
459 signal(SIGHUP, KillChild);
460 signal(SIGTERM, KillChild);
461 signal(SIGINT, KillChild);
462 signal(SIGQUIT, KillChild);
464 /* Wait for our child to close its pipe before we exit */
465 while ((ret = read(bgpipe[0], &c, 1)) == 1) {
469 prompt_Printf(prompt, "PPP enabled\n");
470 log_Printf(LogPHASE, "Parent: PPP enabled\n");
475 prompt_Printf(prompt, "Attempting redial\n");
479 prompt_Printf(prompt, "Attempting reconnect\n");
482 prompt_Printf(prompt, "Child failed (%s)\n",
484 log_Printf(LogPHASE, "Parent: Child failed (%s)\n",
490 prompt_Printf(prompt, "Child exit, no status.\n");
491 log_Printf(LogPHASE, "Parent: Child exit, no status.\n");
496 } else if (sw.mode == PHYS_BACKGROUND) {
498 bundle->notify.fd = bgpipe[1];
501 bundle_ChangedPID(bundle);
502 bundle_LockTun(bundle); /* we have a new pid */
505 /* -auto, -dedicated, -ddial, -foreground & -background */
506 prompt_Destroy(prompt, 0);
507 close(STDOUT_FILENO);
508 close(STDERR_FILENO);
514 * -direct - STDIN_FILENO gets used by physical_Open. STDOUT_FILENO
515 * *may* get used in exec/pipe mode.
517 prompt_TtyInit(NULL);
518 close(STDERR_FILENO);
522 close(STDERR_FILENO);
523 prompt_TtyInit(prompt);
524 prompt_TtyCommandMode(prompt);
525 prompt_Required(prompt);
528 /* We can get rid of these now */
529 for (f = 0; f < sizeof holdfd / sizeof *holdfd; f++)
532 log_Printf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(sw.mode));
534 AbortProgram(EX_NORMAL);
540 DoLoop(struct bundle *bundle)
542 fd_set *rfds, *wfds, *efds;
543 int i, nfds, nothing_done;
545 if ((rfds = mkfdset()) == NULL) {
546 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
550 if ((wfds = mkfdset()) == NULL) {
551 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
556 if ((efds = mkfdset()) == NULL) {
557 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
563 for (; !bundle_IsDead(bundle); bundle_CleanDatalinks(bundle)) {
569 /* All our datalinks, the tun device and the MP socket */
570 descriptor_UpdateSet(&bundle->desc, rfds, wfds, efds, &nfds);
572 /* All our prompts and the diagnostic socket */
573 descriptor_UpdateSet(&server.desc, rfds, NULL, NULL, &nfds);
575 bundle_CleanDatalinks(bundle);
576 if (bundle_IsDead(bundle))
577 /* Don't select - we'll be here forever */
581 * It's possible that we've had a signal since we last checked. If
582 * we don't check again before calling select(), we may end up stuck
583 * after having missed the event.... sig_Handle() tries to be as
584 * quick as possible if nothing is likely to have happened.
585 * This is only really likely if we block in open(... O_NONBLOCK)
586 * which will happen with a misconfigured device.
591 i = select(nfds, rfds, wfds, efds, NULL);
593 if (i < 0 && errno != EINTR) {
594 log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
595 if (log_IsKept(LogTIMER)) {
598 for (i = 0; i <= nfds; i++) {
599 if (FD_ISSET(i, rfds)) {
600 log_Printf(LogTIMER, "Read set contains %d\n", i);
602 t.tv_sec = t.tv_usec = 0;
603 if (select(nfds, rfds, wfds, efds, &t) != -1) {
604 log_Printf(LogTIMER, "The culprit !\n");
608 if (FD_ISSET(i, wfds)) {
609 log_Printf(LogTIMER, "Write set contains %d\n", i);
611 t.tv_sec = t.tv_usec = 0;
612 if (select(nfds, rfds, wfds, efds, &t) != -1) {
613 log_Printf(LogTIMER, "The culprit !\n");
617 if (FD_ISSET(i, efds)) {
618 log_Printf(LogTIMER, "Error set contains %d\n", i);
620 t.tv_sec = t.tv_usec = 0;
621 if (select(nfds, rfds, wfds, efds, &t) != -1) {
622 log_Printf(LogTIMER, "The culprit !\n");
631 log_Printf(LogTIMER, "Select returns %d\n", i);
638 for (i = 0; i <= nfds; i++)
639 if (FD_ISSET(i, efds)) {
640 log_Printf(LogPHASE, "Exception detected on descriptor %d\n", i);
641 /* We deal gracefully with link descriptor exceptions */
642 if (!bundle_Exception(bundle, i)) {
643 log_Printf(LogERROR, "Exception cannot be handled !\n");
653 if (descriptor_IsSet(&server.desc, rfds)) {
654 descriptor_Read(&server.desc, bundle, rfds);
658 if (descriptor_IsSet(&bundle->desc, rfds)) {
659 descriptor_Read(&bundle->desc, bundle, rfds);
663 if (descriptor_IsSet(&bundle->desc, wfds))
664 if (descriptor_Write(&bundle->desc, bundle, wfds) <= 0 && nothing_done) {
666 * This is disastrous. The OS has told us that something is
667 * writable, and all our write()s have failed. Rather than
668 * going back immediately to do our UpdateSet()s and select(),
669 * we sleep for a bit to avoid gobbling up all cpu time.
675 select(0, NULL, NULL, NULL, &t);
679 log_Printf(LogDEBUG, "DoLoop done.\n");