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diff --git a/src/main.c b/src/main.c
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+++ b/src/main.c
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+/*-
+ * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
+ * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
+ * 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: src/usr.sbin/ppp/main.c,v 1.193.10.1.4.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+#include <net/route.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <termios.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#ifndef NONAT
+#ifdef LOCALNAT
+#include "alias.h"
+#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 "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;
+
+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
+ 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", 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'' */
+
+ 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)
+ 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 (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");
+}
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