2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 static char rcsid[] = "$Id: main.c,v 1.4 1993/12/15 00:17:43 paulus Exp $";
35 * If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
36 * /etc/ppp/options exists.
38 #ifndef REQ_SYSOPTIONS
39 #define REQ_SYSOPTIONS 0
50 #include <sys/ioctl.h>
55 #include <sys/param.h>
56 #include <sys/types.h>
58 #include <sys/socket.h>
64 #include <net/if_ppp.h>
81 #include "pathnames.h"
82 #include "patchlevel.h"
94 static char *pidpath = PIDPATH; /* filename in which pid will be stored */
96 static char *pidpath = _PATH_PIDFILE;
100 char ifname[IFNAMSIZ]; /* Interface name */
101 int ifunit; /* Interface unit number */
103 char *progname; /* Name of this program */
104 char hostname[MAXNAMELEN]; /* Our hostname */
105 char our_name[MAXNAMELEN];
106 char remote_name[MAXNAMELEN];
108 static pid_t pid; /* Our pid */
109 static pid_t pgrpid; /* Process Group ID */
110 static char pidfilename[MAXPATHLEN];
112 char devname[MAXPATHLEN] = "/dev/tty"; /* Device name */
113 int default_device = TRUE; /* use default device (stdin/out) */
115 int fd; /* Device file descriptor */
116 int s; /* Socket file descriptor */
119 static struct sgttyb initsgttyb; /* Initial TTY sgttyb */
121 static struct termios inittermios; /* Initial TTY termios */
124 static int initfdflags = -1; /* Initial file descriptor flags */
126 static int restore_term; /* 1 => we've munged the terminal */
128 u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */
129 static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */
131 int hungup; /* terminal has been hung up */
133 /* configured variables */
135 int debug = 0; /* Debug flag */
136 char user[MAXNAMELEN]; /* username for PAP */
137 char passwd[MAXSECRETLEN]; /* password for PAP */
138 char *connector = NULL; /* "connect" command */
139 int inspeed = 0; /* Input/Output speed */
140 u_long netmask = 0; /* netmask to use on ppp interface */
141 int crtscts = 0; /* use h/w flow control */
142 int nodetach = 0; /* don't fork */
143 int modem = 0; /* use modem control lines */
144 int auth_required = 0; /* require peer to authenticate */
145 int defaultroute = 0; /* assign default route through interface */
146 int proxyarp = 0; /* set entry in arp table */
147 int persist = 0; /* re-initiate on termination */
148 int answer = 0; /* wait for incoming call */
149 int uselogin = 0; /* check PAP info against /etc/passwd */
153 static void hup __ARGS((int, int, struct sigcontext *, char *));
154 static void intr __ARGS((int, int, struct sigcontext *, char *));
155 static void term __ARGS((int, int, struct sigcontext *, char *));
156 static void alrm __ARGS((int, int, struct sigcontext *, char *));
157 static void io __ARGS((int, int, struct sigcontext *, char *));
158 static void incdebug __ARGS((int));
159 static void nodebug __ARGS((int));
160 void establish_ppp __ARGS((void));
162 void cleanup __ARGS((int, caddr_t));
163 void die __ARGS((int));
164 void dumpbuffer __ARGS((unsigned char *, int, int));
167 extern char *ttyname __ARGS((int));
169 extern char *getlogin __ARGS((void));
172 * PPP Data Link Layer "protocol" table.
173 * One entry per supported protocol.
175 static struct protent {
181 { LCP, lcp_init, lcp_input, lcp_protrej },
182 { IPCP, ipcp_init, ipcp_input, ipcp_protrej },
183 { UPAP, upap_init, upap_input, upap_protrej },
184 { CHAP, ChapInit, ChapInput, ChapProtocolReject },
199 * Initialize syslog system and magic number package.
201 #if BSD >= 43 || defined(sun)
202 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
203 setlogmask(LOG_UPTO(LOG_INFO));
205 openlog("pppd", LOG_PID);
206 #define LOG_UPTO(x) (x)
207 #define setlogmask(x) (x)
211 p = ttyname(fileno(stdin));
218 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
219 syslog(LOG_ERR, "couldn't get hostname: %m");
222 hostname[MAXNAMELEN-1] = 0;
226 if (!ppp_available()) {
227 fprintf(stderr, "Sorry - PPP is not available on this system\n");
232 * Initialize to the standard option set, then parse, in order,
233 * the system options file, the user's options file, and the command
236 for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
237 (*prottbl[i].init)(0);
241 if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS) ||
242 !options_from_user() ||
243 !parse_args(argc-1, argv+1))
245 check_auth_options();
251 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
252 VERSION, PATCHLEVEL, p, getuid());
256 * Make sure we can set the serial device to be our controlling terminal.
258 if (default_device) {
260 * No device name was specified:
261 * we are in the device's session already.
263 if ((pgrpid = getpgrp(0)) < 0) {
264 syslog(LOG_ERR, "getpgrp(0): %m");
270 * Not default device: make sure we're not a process group leader,
271 * then become session leader of a new session (so we can make
272 * our device its controlling terminal and thus get SIGHUPs).
275 /* fork so we're not a process group leader */
277 exit(0); /* parent is finished */
280 syslog(LOG_ERR, "fork: %m");
283 pid = getpid(); /* otherwise pid is 0 in child */
286 * try to put ourself into our parent's process group,
287 * so we're not a process group leader
289 if (setpgrp(pid, getppid()) < 0)
290 syslog(LOG_WARNING, "setpgrp: %m");
293 /* create new session */
294 if ((pgrpid = setsid()) < 0) {
295 syslog(LOG_ERR, "setsid(): %m");
301 /* Get an internet socket for doing socket ioctl's on. */
302 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
303 syslog(LOG_ERR, "socket : %m");
308 * Compute mask of all interesting signals and install signal handlers
309 * for each. Only one signal handler may be active at a time. Therefore,
310 * all other signals should be masked when any handler is executing.
313 sigaddset(&mask, SIGHUP);
314 sigaddset(&mask, SIGINT);
315 sigaddset(&mask, SIGALRM);
316 sigaddset(&mask, SIGIO);
318 sigaddset(&mask, SIGPOLL);
321 #define SIGNAL(s, handler) { \
322 sv.sv_handler = handler; \
323 if (sigvec(s, &sv, NULL) < 0) { \
324 syslog(LOG_ERR, "sigvec(%d): %m", s); \
331 SIGNAL(SIGHUP, hup); /* Hangup */
332 SIGNAL(SIGINT, intr); /* Interrupt */
333 SIGNAL(SIGTERM, term); /* Terminate */
334 SIGNAL(SIGALRM, alrm); /* Timeout */
335 SIGNAL(SIGIO, io); /* Input available */
337 SIGNAL(SIGPOLL, io); /* Input available */
340 signal(SIGUSR1, incdebug); /* Increment debug flag */
341 signal(SIGUSR2, nodebug); /* Reset debug flag */
345 * Open the serial device and set it up to be the ppp interface.
347 if ((fd = open(devname, O_RDWR /*| O_NDELAY*/)) < 0) {
348 syslog(LOG_ERR, "open(%s): %m", devname);
353 /* set device to be controlling tty */
354 if (!default_device && ioctl(fd, TIOCSCTTY) < 0) {
355 syslog(LOG_ERR, "ioctl(TIOCSCTTY): %m");
359 /* set line speed, flow control, etc. */
362 /* run connection script */
364 syslog(LOG_INFO, "Connecting with <%s>", connector);
366 /* drop dtr to hang up in case modem is off hook */
367 if (!default_device && modem) {
373 if (set_up_connection(connector, fd, fd) < 0) {
374 syslog(LOG_ERR, "could not set up connection");
379 syslog(LOG_INFO, "Connected...");
380 sleep(1); /* give it time to set up its terminal */
383 /* set up the serial device as a ppp interface */
386 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
387 (void) sprintf(ifname, "ppp%d", ifunit);
389 /* write pid to file */
390 (void) sprintf(pidfilename, "%s/%s.pid", pidpath, ifname);
391 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
392 fprintf(pidfile, "%d\n", pid);
393 (void) fclose(pidfile);
395 syslog(LOG_ERR, "unable to create pid file: %m");
400 * Set process group of device to our process group so we can get
401 * SIGIOs and SIGHUPs.
404 if (default_device) {
405 int id = tcgetpgrp(fd);
407 syslog(LOG_WARNING, "warning: not in tty's process group");
410 if (tcsetpgrp(fd, pgrpid) < 0) {
411 syslog(LOG_ERR, "tcsetpgrp(): %m");
416 /* set process group on tty so we get SIGIO's */
417 if (ioctl(fd, TIOCSPGRP, &pgrpid) < 0) {
418 syslog(LOG_ERR, "ioctl(TIOCSPGRP): %m");
424 * Record initial device flags, then set device to cause SIGIO
425 * signals to be generated.
427 if ((initfdflags = fcntl(fd, F_GETFL)) == -1) {
428 syslog(LOG_ERR, "fcntl(F_GETFL): %m");
431 if (fcntl(fd, F_SETFL, FNDELAY | FASYNC) == -1) {
432 syslog(LOG_ERR, "fcntl(F_SETFL, FNDELAY | FASYNC): %m");
437 * Block all signals, start opening the connection, and wait for
438 * incoming signals (reply, timeout, etc.).
440 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devname);
441 sigprocmask(SIG_BLOCK, &mask, NULL); /* Block signals now */
442 lcp_lowerup(0); /* XXX Well, sort of... */
443 lcp_open(0); /* Start protocol */
445 sigpause(0); /* Wait for next signal */
451 * XXX assume speed_t values numerically equal bits per second
452 * (so we can ask for any speed).
454 #define translate_speed(bps) (bps)
458 * List of valid speeds.
461 int speed_int, speed_val;
533 * Translate from bits/second to a speed_t.
539 struct speed *speedp;
543 for (speedp = speeds; speedp->speed_int; speedp++)
544 if (bps == speedp->speed_int)
545 return speedp->speed_val;
546 syslog(LOG_WARNING, "speed %d not supported", bps);
552 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
553 * at the requested speed, etc.
562 if (tcgetattr(fd, &tios) < 0) {
563 syslog(LOG_ERR, "tcgetattr: %m");
570 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS);
571 tios.c_cflag |= CS8 | CREAD | HUPCL;
573 tios.c_cflag |= CRTSCTS;
575 tios.c_cflag |= CLOCAL;
576 tios.c_iflag = IGNBRK | IGNPAR;
580 tios.c_cc[VTIME] = 0;
581 speed = translate_speed(inspeed);
583 cfsetospeed(&tios, speed);
584 cfsetispeed(&tios, speed);
587 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
588 syslog(LOG_ERR, "tcsetattr: %m");
593 struct sgttyb sgttyb;
596 * Put the tty in raw mode.
598 if (ioctl(fd, TIOCGETP, &sgttyb) < 0) {
599 syslog(LOG_ERR, "ioctl(TIOCGETP): %m");
606 sgttyb.sg_flags = RAW | ANYP;
607 speed = translate_speed(inspeed);
609 sgttyb.sg_ispeed = speed;
611 if (ioctl(fd, TIOCSETP, &sgttyb) < 0) {
612 syslog(LOG_ERR, "ioctl(TIOCSETP): %m");
621 * quit - Clean up state and exit.
630 * die - like quit, except we can specify an exit status.
637 syslog(LOG_INFO, "Exit.");
642 * cleanup - restore anything which needs to be restored before we exit
651 /* drop dtr to hang up */
655 if (fcntl(fd, F_SETFL, initfdflags) < 0)
656 syslog(LOG_ERR, "fcntl(F_SETFL, fdflags): %m");
662 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
663 syslog(LOG_ERR, "tcsetattr: %m");
665 if (ioctl(fd, TIOCSETP, &initsgttyb) < 0)
666 syslog(LOG_ERR, "ioctl(TIOCSETP): %m");
674 if (pidfilename[0] != 0 && unlink(pidfilename) < 0)
675 syslog(LOG_WARNING, "unable to unlink pid file: %m");
680 static struct callout *callout = NULL; /* Callout list */
681 static struct timeval schedtime; /* Time last timeout was set */
684 * timeout - Schedule a timeout.
686 * Note that this timeout takes the number of seconds, NOT hz (as in
690 timeout(func, arg, time)
695 struct itimerval itv;
696 struct callout *newp, **oldpp;
698 MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.",
699 (int) func, (int) arg, time));
704 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
705 syslog(LOG_ERR, "Out of memory in timeout()!");
712 * Find correct place to link it in and decrement its time by the
713 * amount of time used by preceding timeouts.
715 for (oldpp = &callout;
716 *oldpp && (*oldpp)->c_time <= time;
717 oldpp = &(*oldpp)->c_next)
718 time -= (*oldpp)->c_time;
720 newp->c_next = *oldpp;
722 (*oldpp)->c_time -= time;
726 * If this is now the first callout then we have to set a new
729 if (callout == newp) {
730 itv.it_interval.tv_sec = itv.it_interval.tv_usec =
731 itv.it_value.tv_usec = 0;
732 itv.it_value.tv_sec = callout->c_time;
733 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.",
734 itv.it_value.tv_sec));
735 if (setitimer(ITIMER_REAL, &itv, NULL)) {
736 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
739 if (gettimeofday(&schedtime, NULL)) {
740 syslog(LOG_ERR, "gettimeofday: %m");
748 * untimeout - Unschedule a timeout.
755 struct itimerval itv;
756 struct callout **copp, *freep;
759 MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg));
762 * If the first callout is unscheduled then we have to set a new
766 callout->c_func == func &&
767 callout->c_arg == arg)
771 * Find first matching timeout. Add its time to the next timeouts
774 for (copp = &callout; *copp; copp = &(*copp)->c_next)
775 if ((*copp)->c_func == func &&
776 (*copp)->c_arg == arg) {
778 *copp = freep->c_next;
780 (*copp)->c_time += freep->c_time;
781 (void) free((char *) freep);
786 itv.it_interval.tv_sec = itv.it_interval.tv_usec =
787 itv.it_value.tv_usec = 0;
788 itv.it_value.tv_sec = callout ? callout->c_time : 0;
789 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.",
790 itv.it_value.tv_sec));
791 if (setitimer(ITIMER_REAL, &itv, NULL)) {
792 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
795 if (gettimeofday(&schedtime, NULL)) {
796 syslog(LOG_ERR, "gettimeofday: %m");
804 * adjtimeout - Decrement the first timeout by the amount of time since
816 * Make sure that the clock hasn't been warped dramatically.
817 * Account for recently expired, but blocked timer by adding
818 * small fudge factor.
820 if (gettimeofday(&tv, NULL)) {
821 syslog(LOG_ERR, "gettimeofday: %m");
824 timediff = tv.tv_sec - schedtime.tv_sec;
826 timediff > callout->c_time + 1)
829 callout->c_time -= timediff; /* OK, Adjust time */
834 * hup - Catch SIGHUP signal.
836 * Indicates that the physical layer has been disconnected.
840 hup(sig, code, scp, addr)
842 struct sigcontext *scp;
845 syslog(LOG_INFO, "Hangup (SIGHUP)");
847 hungup = 1; /* they hung up on us! */
848 persist = 0; /* don't try to restart */
849 adjtimeout(); /* Adjust timeouts */
850 lcp_lowerdown(0); /* Reset connection */
851 quit(); /* and die */
856 * term - Catch SIGTERM signal.
858 * Indicates that we should initiate a graceful disconnect and exit.
862 term(sig, code, scp, addr)
864 struct sigcontext *scp;
867 syslog(LOG_INFO, "Terminating link.");
868 persist = 0; /* don't try to restart */
869 adjtimeout(); /* Adjust timeouts */
870 lcp_close(0); /* Close connection */
875 * intr - Catch SIGINT signal (DEL/^C).
877 * Indicates that we should initiate a graceful disconnect and exit.
881 intr(sig, code, scp, addr)
883 struct sigcontext *scp;
886 syslog(LOG_INFO, "Interrupt received: terminating link");
887 persist = 0; /* don't try to restart */
888 adjtimeout(); /* Adjust timeouts */
889 lcp_close(0); /* Close connection */
894 * alrm - Catch SIGALRM signal.
896 * Indicates a timeout.
900 alrm(sig, code, scp, addr)
902 struct sigcontext *scp;
905 struct itimerval itv;
906 struct callout *freep;
908 MAINDEBUG((LOG_DEBUG, "Alarm"));
911 * Call and free first scheduled timeout and any that were scheduled
915 freep = callout; /* Remove entry before calling */
916 callout = freep->c_next;
917 (*freep->c_func)(freep->c_arg);
918 (void) free((char *) freep);
919 if (callout && callout->c_time)
924 * Set a new itimer if there are more timeouts scheduled.
927 itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0;
928 itv.it_value.tv_usec = 0;
929 itv.it_value.tv_sec = callout->c_time;
930 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.",
931 itv.it_value.tv_sec));
932 if (setitimer(ITIMER_REAL, &itv, NULL)) {
933 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
936 if (gettimeofday(&schedtime, NULL)) {
937 syslog(LOG_ERR, "gettimeofday: %m");
945 * io - Catch SIGIO signal.
947 * Indicates that incoming data is available.
951 io(sig, code, scp, addr)
953 struct sigcontext *scp;
960 struct timeval notime;
963 MAINDEBUG((LOG_DEBUG, "IO signal received"));
964 adjtimeout(); /* Adjust timeouts */
966 /* we do this to see if the SIGIO handler is being invoked for input */
967 /* ready, or for the socket buffer hitting the low-water mark. */
974 if ((ready = select(32, &fdset, (fd_set *) NULL, (fd_set *) NULL,
976 syslog(LOG_ERR, "Error in io() select: %m");
981 MAINDEBUG((LOG_DEBUG, "IO non-input ready SIGIO occured."));
985 /* Yup, this is for real */
986 for (;;) { /* Read all available packets */
987 p = inpacket_buf; /* point to beginning of packet buffer */
989 len = read_packet(inpacket_buf);
994 syslog(LOG_ERR, "End of file on fd!");
998 if (len < DLLHEADERLEN) {
999 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
1003 p += 2; /* Skip address and control */
1004 GETSHORT(protocol, p);
1005 len -= DLLHEADERLEN;
1008 * Toss all non-LCP packets unless LCP is OPEN.
1010 if (protocol != LCP && lcp_fsm[0].state != OPENED) {
1011 MAINDEBUG((LOG_INFO,
1012 "io(): Received non-LCP packet when LCP not open."));
1014 dumpbuffer(inpacket_buf, len + DLLHEADERLEN, LOG_INFO);
1019 * Upcall the proper protocol input routine.
1021 for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
1022 if (prottbl[i].protocol == protocol) {
1023 (*prottbl[i].input)(0, p, len);
1027 if (i == sizeof (prottbl) / sizeof (struct protent)) {
1028 syslog(LOG_WARNING, "input: Unknown protocol (%x) received!",
1030 lcp_sprotrej(0, p - DLLHEADERLEN, len + DLLHEADERLEN);
1036 * demuxprotrej - Demultiplex a Protocol-Reject.
1039 demuxprotrej(unit, protocol)
1046 * Upcall the proper Protocol-Reject routine.
1048 for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
1049 if (prottbl[i].protocol == protocol) {
1050 (*prottbl[i].protrej)(unit);
1055 "demuxprotrej: Unrecognized Protocol-Reject for protocol %d!",
1061 * incdebug - Catch SIGUSR1 signal.
1063 * Increment debug flag.
1070 syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
1071 setlogmask(LOG_UPTO(LOG_DEBUG));
1077 * nodebug - Catch SIGUSR2 signal.
1079 * Turn off debugging.
1086 setlogmask(LOG_UPTO(LOG_WARNING));
1092 * set_up_connection - run a program to initialize the serial connector
1095 set_up_connection(program, in, out)
1104 sigaddset(&mask, SIGINT);
1105 sigaddset(&mask, SIGHUP);
1106 sigprocmask(SIG_BLOCK, &mask, &mask);
1111 syslog(LOG_ERR, "fork: %m");
1116 setreuid(getuid(), getuid());
1117 setregid(getgid(), getgid());
1118 sigprocmask(SIG_SETMASK, &mask, NULL);
1121 execl("/bin/sh", "sh", "-c", program, (char *)0);
1122 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1127 while (waitpid(pid, &status, 0) != pid) {
1130 syslog(LOG_ERR, "waiting for connection process: %m");
1133 sigprocmask(SIG_SETMASK, &mask, NULL);
1135 return (status == 0 ? 0 : -1);
1140 * Return user specified netmask. A value of zero means no netmask has
1152 * dumpbuffer - print contents of a buffer in hex to standard output.
1155 dumpbuffer(buffer, size, level)
1156 unsigned char *buffer;
1163 printf("%d bytes:\n", size);
1167 sprintf(p, "%08lx: ", buffer);
1170 for (i = 0; i < 8; i++, p += 3)
1174 sprintf(p, "%02x ", buffer[i]);
1176 for (i = 0; i < 8; i++)
1180 *p++ = (' ' <= buffer[i] && buffer[i] <= '~') ?
1187 /* syslog(level, "%s\n", line); */
1188 printf("%s\n", line);
1195 * setdtr - control the DTR line on the serial port.
1196 * This is called from die(), so it shouldn't call die().
1201 int modembits = TIOCM_DTR;
1203 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
1206 #include <varargs.h>
1211 logf(level, fmt, va_alist)
1220 vsprintf(buf, fmt, pvar);
1223 p = line + strlen(line);
1226 if (buf[strlen(buf)-1] == '\n') {
1227 syslog(level, "%s", line);
1236 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);