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 1.9 1994/05/09 02:40:21 paulus Exp $";
36 * If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
37 * /etc/ppp/options exists.
39 #ifndef REQ_SYSOPTIONS
40 #define REQ_SYSOPTIONS 0
51 #include <sys/ioctl.h>
56 #include <sys/param.h>
57 #include <sys/types.h>
59 #include <sys/socket.h>
65 #include <net/if_ppp.h>
82 #include "pathnames.h"
83 #include "patchlevel.h"
95 static char *pidpath = PIDPATH; /* filename in which pid will be stored */
97 static char *pidpath = _PATH_PIDFILE;
101 char ifname[IFNAMSIZ]; /* Interface name */
102 int ifunit; /* Interface unit number */
104 char *progname; /* Name of this program */
105 char hostname[MAXNAMELEN]; /* Our hostname */
106 char our_name[MAXNAMELEN];
107 char remote_name[MAXNAMELEN];
109 static pid_t pid; /* Our pid */
110 static pid_t pgrpid; /* Process Group ID */
111 static char pidfilename[MAXPATHLEN];
113 char devname[MAXPATHLEN] = "/dev/tty"; /* Device name */
114 int default_device = TRUE; /* use default device (stdin/out) */
116 int fd = -1; /* Device file descriptor */
117 int s; /* Socket file descriptor */
119 int phase; /* where the link is at */
122 static struct sgttyb initsgttyb; /* Initial TTY sgttyb */
124 static struct termios inittermios; /* Initial TTY termios */
127 static int initfdflags = -1; /* Initial file descriptor flags */
129 static int restore_term; /* 1 => we've munged the terminal */
131 u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */
132 static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */
134 int hungup; /* terminal has been hung up */
135 static int n_children; /* # child processes still running */
137 /* configured variables */
139 int debug = 0; /* Debug flag */
140 int kdebugflag = 0; /* Kernel debugging flag */
141 char user[MAXNAMELEN]; /* username for PAP */
142 char passwd[MAXSECRETLEN]; /* password for PAP */
143 char *connector = NULL; /* "connect" command */
144 char *disconnector = NULL; /* "disconnect" command */
145 int inspeed = 0; /* Input/Output speed requested */
146 int baud_rate; /* bits/sec currently used */
147 u_long netmask = 0; /* netmask to use on ppp interface */
148 int crtscts = 0; /* use h/w flow control */
149 int nodetach = 0; /* don't fork */
150 int modem = 0; /* use modem control lines */
151 int auth_required = 0; /* require peer to authenticate */
152 int defaultroute = 0; /* assign default route through interface */
153 int proxyarp = 0; /* set entry in arp table */
154 int persist = 0; /* re-initiate on termination */
155 int answer = 0; /* wait for incoming call */
156 int uselogin = 0; /* check PAP info against /etc/passwd */
157 int lockflag = 0; /* lock the serial device */
161 static void hup __ARGS((int, int, struct sigcontext *, char *));
162 static void intr __ARGS((int, int, struct sigcontext *, char *));
163 static void term __ARGS((int, int, struct sigcontext *, char *));
164 static void alrm __ARGS((int, int, struct sigcontext *, char *));
165 static void io __ARGS((int, int, struct sigcontext *, char *));
166 static void incdebug __ARGS((int));
167 static void nodebug __ARGS((int));
168 void establish_ppp __ARGS((void));
170 void reap_kids __ARGS((void));
171 void cleanup __ARGS((int, caddr_t));
172 void die __ARGS((int));
173 void novm __ARGS((char *));
175 void log_packet __ARGS((u_char *, int, char *));
176 void format_packet __ARGS((u_char *, int,
177 void (*) (void *, char *, ...), void *));
178 void pr_log __ARGS((void *, char *, ...));
181 extern char *ttyname __ARGS((int));
183 extern char *getlogin __ARGS((void));
186 * PPP Data Link Layer "protocol" table.
187 * One entry per supported protocol.
189 static struct protent {
197 { LCP, lcp_init, lcp_input, lcp_protrej, lcp_printpkt, "LCP" },
198 { IPCP, ipcp_init, ipcp_input, ipcp_protrej, ipcp_printpkt, "IPCP" },
199 { UPAP, upap_init, upap_input, upap_protrej, upap_printpkt, "PAP" },
200 { CHAP, ChapInit, ChapInput, ChapProtocolReject, ChapPrintPkt, "CHAP" },
203 #define N_PROTO (sizeof(prottbl) / sizeof(prottbl[0]))
216 p = ttyname(fileno(stdin));
221 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
222 perror("couldn't get hostname");
225 hostname[MAXNAMELEN-1] = 0;
229 if (!ppp_available()) {
230 fprintf(stderr, "Sorry - PPP is not available on this system\n");
235 * Initialize to the standard option set, then parse, in order,
236 * the system options file, the user's options file, and the command
239 for (i = 0; i < N_PROTO; i++)
240 (*prottbl[i].init)(0);
244 if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS) ||
245 !options_from_user() ||
246 !parse_args(argc-1, argv+1))
248 check_auth_options();
251 if (lockflag && !default_device)
252 if (lock(devname) < 0)
256 * Initialize syslog system and magic number package.
258 #if (BSD >= 43 || defined(sun)) && !defined(ultrix)
259 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
260 setlogmask(LOG_UPTO(LOG_INFO));
262 openlog("pppd", LOG_PID);
263 #define LOG_UPTO(x) (x)
264 #define setlogmask(x) (x)
267 setlogmask(LOG_UPTO(LOG_DEBUG));
274 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
275 VERSION, PATCHLEVEL, p, getuid());
279 * Make sure we can set the serial device to be our controlling terminal.
281 if (default_device) {
283 * No device name was specified:
284 * we are in the device's session already.
286 if ((pgrpid = getpgrp(0)) < 0) {
287 syslog(LOG_ERR, "getpgrp(0): %m");
293 * Not default device: make sure we're not a process group leader,
294 * then become session leader of a new session (so we can make
295 * our device its controlling terminal and thus get SIGHUPs).
298 /* fork so we're not a process group leader */
300 exit(0); /* parent is finished */
303 syslog(LOG_ERR, "fork: %m");
306 pid = getpid(); /* otherwise pid is 0 in child */
309 * try to put ourself into our parent's process group,
310 * so we're not a process group leader
312 if (setpgrp(pid, getppid()) < 0)
313 syslog(LOG_WARNING, "setpgrp: %m");
316 /* create new session */
317 if ((pgrpid = setsid()) < 0) {
318 syslog(LOG_ERR, "setsid(): %m");
324 /* Get an internet socket for doing socket ioctl's on. */
325 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
326 syslog(LOG_ERR, "socket : %m");
331 * Compute mask of all interesting signals and install signal handlers
332 * for each. Only one signal handler may be active at a time. Therefore,
333 * all other signals should be masked when any handler is executing.
336 sigaddset(&mask, SIGHUP);
337 sigaddset(&mask, SIGINT);
338 sigaddset(&mask, SIGALRM);
339 sigaddset(&mask, SIGIO);
341 sigaddset(&mask, SIGPOLL);
344 #define SIGNAL(s, handler) { \
345 sv.sv_handler = handler; \
346 if (sigvec(s, &sv, NULL) < 0) { \
347 syslog(LOG_ERR, "sigvec(%d): %m", s); \
354 SIGNAL(SIGHUP, hup); /* Hangup */
355 SIGNAL(SIGINT, intr); /* Interrupt */
356 SIGNAL(SIGTERM, term); /* Terminate */
357 SIGNAL(SIGALRM, alrm); /* Timeout */
358 SIGNAL(SIGIO, io); /* Input available */
360 SIGNAL(SIGPOLL, io); /* Input available */
363 signal(SIGUSR1, incdebug); /* Increment debug flag */
364 signal(SIGUSR2, nodebug); /* Reset debug flag */
367 * Block SIGIOs and SIGPOLLs for now
370 sigaddset(&mask, SIGIO);
372 sigaddset(&mask, SIGPOLL);
374 sigprocmask(SIG_BLOCK, &mask, NULL);
377 * Open the serial device and set it up to be the ppp interface.
379 if ((fd = open(devname, O_RDWR /*| O_NDELAY*/)) < 0) {
380 syslog(LOG_ERR, "open(%s): %m", devname);
386 /* set device to be controlling tty */
387 if (!default_device && ioctl(fd, TIOCSCTTY) < 0) {
388 syslog(LOG_ERR, "ioctl(TIOCSCTTY): %m");
391 #endif /* TIOCSCTTY */
393 /* run connection script */
395 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
397 /* set line speed, flow control, etc.; set CLOCAL for now */
400 /* drop dtr to hang up in case modem is off hook */
401 if (!default_device && modem) {
407 if (device_script(connector, fd, fd) < 0) {
408 syslog(LOG_ERR, "could not set up connection");
413 syslog(LOG_INFO, "Connected...");
414 sleep(1); /* give it time to set up its terminal */
417 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
420 /* set up the serial device as a ppp interface */
423 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
424 (void) sprintf(ifname, "ppp%d", ifunit);
426 /* write pid to file */
427 (void) sprintf(pidfilename, "%s/%s.pid", pidpath, ifname);
428 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
429 fprintf(pidfile, "%d\n", pid);
430 (void) fclose(pidfile);
432 syslog(LOG_ERR, "unable to create pid file: %m");
437 * Set process group of device to our process group so we can get
438 * SIGIOs and SIGHUPs.
441 if (default_device) {
442 int id = tcgetpgrp(fd);
444 syslog(LOG_WARNING, "warning: not in tty's process group");
447 if (tcsetpgrp(fd, pgrpid) < 0) {
448 syslog(LOG_ERR, "tcsetpgrp(): %m");
453 /* set process group on tty so we get SIGIO's */
454 if (ioctl(fd, TIOCSPGRP, &pgrpid) < 0) {
455 syslog(LOG_ERR, "ioctl(TIOCSPGRP): %m");
461 * Record initial device flags, then set device to cause SIGIO
462 * signals to be generated.
464 if ((initfdflags = fcntl(fd, F_GETFL)) == -1) {
465 syslog(LOG_ERR, "fcntl(F_GETFL): %m");
468 if (fcntl(fd, F_SETFL, FNDELAY | FASYNC) == -1) {
469 syslog(LOG_ERR, "fcntl(F_SETFL, FNDELAY | FASYNC): %m");
474 * Block all signals, start opening the connection, and wait for
475 * incoming signals (reply, timeout, etc.).
477 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devname);
478 sigprocmask(SIG_BLOCK, &mask, NULL); /* Block signals now */
479 lcp_lowerup(0); /* XXX Well, sort of... */
480 lcp_open(0); /* Start protocol */
481 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
482 sigpause(0); /* Wait for next signal */
483 reap_kids(); /* Don't leave dead kids lying around */
487 * Run disconnector script, if requested
490 if (device_script(disconnector, fd, fd) < 0) {
491 syslog(LOG_WARNING, "disconnect script failed");
495 syslog(LOG_INFO, "Disconnected...");
503 * XXX assume speed_t values numerically equal bits per second
504 * (so we can ask for any speed).
506 #define translate_speed(bps) (bps)
507 #define baud_rate_of(speed) (speed)
511 * List of valid speeds.
514 int speed_int, speed_val;
586 * Translate from bits/second to a speed_t.
592 struct speed *speedp;
596 for (speedp = speeds; speedp->speed_int; speedp++)
597 if (bps == speedp->speed_int)
598 return speedp->speed_val;
599 syslog(LOG_WARNING, "speed %d not supported", bps);
604 * Translate from a speed_t to bits/second.
610 struct speed *speedp;
614 for (speedp = speeds; speedp->speed_int; speedp++)
615 if (speed == speedp->speed_val)
616 return speedp->speed_int;
622 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
623 * at the requested speed, etc. If `local' is true, set CLOCAL
624 * regardless of whether the modem option was specified.
626 set_up_tty(fd, local)
633 if (tcgetattr(fd, &tios) < 0) {
634 syslog(LOG_ERR, "tcgetattr: %m");
642 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS);
644 tios.c_cflag |= CRTSCTS;
646 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
649 tios.c_cflag |= CS8 | CREAD | HUPCL;
651 tios.c_cflag |= CLOCAL;
652 tios.c_iflag = IGNBRK | IGNPAR;
656 tios.c_cc[VTIME] = 0;
657 speed = translate_speed(inspeed);
659 cfsetospeed(&tios, speed);
660 cfsetispeed(&tios, speed);
662 speed = cfgetospeed(&tios);
665 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
666 syslog(LOG_ERR, "tcsetattr: %m");
672 if (ioctl(fd, (crtscts || modem)? TIOCMODEM: TIOCNMODEM, &x) < 0)
673 syslog(LOG_WARNING, "TIOC(N)MODEM: %m");
674 if (ioctl(fd, (local || !modem)? TIOCNCAR: TIOCCAR) < 0)
675 syslog(LOG_WARNING, "TIOC(N)CAR: %m");
680 struct sgttyb sgttyb;
683 * Put the tty in raw mode.
685 if (ioctl(fd, TIOCGETP, &sgttyb) < 0) {
686 syslog(LOG_ERR, "ioctl(TIOCGETP): %m");
693 sgttyb.sg_flags = RAW | ANYP;
694 speed = translate_speed(inspeed);
696 sgttyb.sg_ispeed = speed;
698 speed = sgttyb.sg_ispeed;
700 if (ioctl(fd, TIOCSETP, &sgttyb) < 0) {
701 syslog(LOG_ERR, "ioctl(TIOCSETP): %m");
706 baud_rate = baud_rate_of(speed);
711 * setdtr - control the DTR line on the serial port.
712 * This is called from die(), so it shouldn't call die().
717 int modembits = TIOCM_DTR;
719 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
724 * quit - Clean up state and exit.
733 * die - like quit, except we can specify an exit status.
740 syslog(LOG_INFO, "Exit.");
745 * cleanup - restore anything which needs to be restored before we exit
754 /* drop dtr to hang up */
758 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
759 syslog(LOG_WARNING, "fcntl(F_SETFL, fdflags): %m");
765 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
766 syslog(LOG_WARNING, "tcsetattr: %m");
768 if (ioctl(fd, TIOCSETP, &initsgttyb) < 0)
769 syslog(LOG_WARNING, "ioctl(TIOCSETP): %m");
777 if (pidfilename[0] != 0 && unlink(pidfilename) < 0)
778 syslog(LOG_WARNING, "unable to unlink pid file: %m");
781 if (lockflag && !default_device)
786 static struct callout *callout = NULL; /* Callout list */
787 static struct timeval schedtime; /* Time last timeout was set */
790 * timeout - Schedule a timeout.
792 * Note that this timeout takes the number of seconds, NOT hz (as in
796 timeout(func, arg, time)
801 struct itimerval itv;
802 struct callout *newp, **oldpp;
804 MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.",
805 (int) func, (int) arg, time));
810 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
811 syslog(LOG_ERR, "Out of memory in timeout()!");
818 * Find correct place to link it in and decrement its time by the
819 * amount of time used by preceding timeouts.
821 for (oldpp = &callout;
822 *oldpp && (*oldpp)->c_time <= time;
823 oldpp = &(*oldpp)->c_next)
824 time -= (*oldpp)->c_time;
826 newp->c_next = *oldpp;
828 (*oldpp)->c_time -= time;
832 * If this is now the first callout then we have to set a new
835 if (callout == newp) {
836 itv.it_interval.tv_sec = itv.it_interval.tv_usec =
837 itv.it_value.tv_usec = 0;
838 itv.it_value.tv_sec = callout->c_time;
839 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in timeout.",
840 itv.it_value.tv_sec));
841 if (setitimer(ITIMER_REAL, &itv, NULL)) {
842 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
845 if (gettimeofday(&schedtime, NULL)) {
846 syslog(LOG_ERR, "gettimeofday: %m");
854 * untimeout - Unschedule a timeout.
861 struct itimerval itv;
862 struct callout **copp, *freep;
865 MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg));
868 * If the first callout is unscheduled then we have to set a new
872 callout->c_func == func &&
873 callout->c_arg == arg)
877 * Find first matching timeout. Add its time to the next timeouts
880 for (copp = &callout; *copp; copp = &(*copp)->c_next)
881 if ((*copp)->c_func == func &&
882 (*copp)->c_arg == arg) {
884 *copp = freep->c_next;
886 (*copp)->c_time += freep->c_time;
887 (void) free((char *) freep);
892 itv.it_interval.tv_sec = itv.it_interval.tv_usec =
893 itv.it_value.tv_usec = 0;
894 itv.it_value.tv_sec = callout ? callout->c_time : 0;
895 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in untimeout.",
896 itv.it_value.tv_sec));
897 if (setitimer(ITIMER_REAL, &itv, NULL)) {
898 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
901 if (gettimeofday(&schedtime, NULL)) {
902 syslog(LOG_ERR, "gettimeofday: %m");
910 * adjtimeout - Decrement the first timeout by the amount of time since
922 * Make sure that the clock hasn't been warped dramatically.
923 * Account for recently expired, but blocked timer by adding
924 * small fudge factor.
926 if (gettimeofday(&tv, NULL)) {
927 syslog(LOG_ERR, "gettimeofday: %m");
930 timediff = tv.tv_sec - schedtime.tv_sec;
932 timediff > callout->c_time + 1)
935 callout->c_time -= timediff; /* OK, Adjust time */
940 * hup - Catch SIGHUP signal.
942 * Indicates that the physical layer has been disconnected.
946 hup(sig, code, scp, addr)
948 struct sigcontext *scp;
951 syslog(LOG_INFO, "Hangup (SIGHUP)");
953 hungup = 1; /* they hung up on us! */
954 persist = 0; /* don't try to restart */
955 adjtimeout(); /* Adjust timeouts */
956 lcp_lowerdown(0); /* Reset connection */
957 quit(); /* and die */
962 * term - Catch SIGTERM signal.
964 * Indicates that we should initiate a graceful disconnect and exit.
968 term(sig, code, scp, addr)
970 struct sigcontext *scp;
973 syslog(LOG_INFO, "Terminating link.");
974 persist = 0; /* don't try to restart */
975 adjtimeout(); /* Adjust timeouts */
976 lcp_close(0); /* Close connection */
981 * intr - Catch SIGINT signal (DEL/^C).
983 * Indicates that we should initiate a graceful disconnect and exit.
987 intr(sig, code, scp, addr)
989 struct sigcontext *scp;
992 syslog(LOG_INFO, "Interrupt received: terminating link");
993 persist = 0; /* don't try to restart */
994 adjtimeout(); /* Adjust timeouts */
995 lcp_close(0); /* Close connection */
1000 * alrm - Catch SIGALRM signal.
1002 * Indicates a timeout.
1006 alrm(sig, code, scp, addr)
1008 struct sigcontext *scp;
1011 struct itimerval itv;
1012 struct callout *freep, *list, *last;
1014 MAINDEBUG((LOG_DEBUG, "Alarm"));
1016 if (callout == NULL)
1019 * Get the first scheduled timeout and any that were scheduled
1020 * for the same time as a list, and remove them all from callout
1023 list = last = callout;
1024 while (last->c_next != NULL && last->c_next->c_time == 0)
1025 last = last->c_next;
1026 callout = last->c_next;
1027 last->c_next = NULL;
1030 * Set a new itimer if there are more timeouts scheduled.
1033 itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0;
1034 itv.it_value.tv_usec = 0;
1035 itv.it_value.tv_sec = callout->c_time;
1036 MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in alrm.",
1037 itv.it_value.tv_sec));
1038 if (setitimer(ITIMER_REAL, &itv, NULL)) {
1039 syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
1042 if (gettimeofday(&schedtime, NULL)) {
1043 syslog(LOG_ERR, "gettimeofday: %m");
1049 * Now call all the timeout routines scheduled for this time.
1052 (*list->c_func)(list->c_arg);
1054 list = list->c_next;
1055 (void) free((char *) freep);
1062 * io - Catch SIGIO signal.
1064 * Indicates that incoming data is available.
1068 io(sig, code, scp, addr)
1070 struct sigcontext *scp;
1077 struct timeval notime;
1080 MAINDEBUG((LOG_DEBUG, "IO signal received"));
1081 adjtimeout(); /* Adjust timeouts */
1083 /* we do this to see if the SIGIO handler is being invoked for input */
1084 /* ready, or for the socket buffer hitting the low-water mark. */
1091 if ((ready = select(32, &fdset, (fd_set *) NULL, (fd_set *) NULL,
1093 syslog(LOG_ERR, "Error in io() select: %m");
1098 MAINDEBUG((LOG_DEBUG, "IO non-input ready SIGIO occured."));
1102 /* Yup, this is for real */
1103 for (;;) { /* Read all available packets */
1104 p = inpacket_buf; /* point to beginning of packet buffer */
1106 len = read_packet(inpacket_buf);
1111 syslog(LOG_WARNING, "End of file on fd!");
1115 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1116 log_packet(p, len, "rcvd ");
1118 if (len < DLLHEADERLEN) {
1119 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
1123 p += 2; /* Skip address and control */
1124 GETSHORT(protocol, p);
1125 len -= DLLHEADERLEN;
1128 * Toss all non-LCP packets unless LCP is OPEN.
1130 if (protocol != LCP && lcp_fsm[0].state != OPENED) {
1131 MAINDEBUG((LOG_INFO,
1132 "io(): Received non-LCP packet when LCP not open."));
1137 * Upcall the proper protocol input routine.
1139 for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
1140 if (prottbl[i].protocol == protocol) {
1141 (*prottbl[i].input)(0, p, len);
1145 if (i == sizeof (prottbl) / sizeof (struct protent)) {
1146 syslog(LOG_WARNING, "input: Unknown protocol (%x) received!",
1148 lcp_sprotrej(0, p - DLLHEADERLEN, len + DLLHEADERLEN);
1154 * demuxprotrej - Demultiplex a Protocol-Reject.
1157 demuxprotrej(unit, protocol)
1164 * Upcall the proper Protocol-Reject routine.
1166 for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
1167 if (prottbl[i].protocol == protocol) {
1168 (*prottbl[i].protrej)(unit);
1173 "demuxprotrej: Unrecognized Protocol-Reject for protocol %d!",
1179 * incdebug - Catch SIGUSR1 signal.
1181 * Increment debug flag.
1188 syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
1189 setlogmask(LOG_UPTO(LOG_DEBUG));
1195 * nodebug - Catch SIGUSR2 signal.
1197 * Turn off debugging.
1204 setlogmask(LOG_UPTO(LOG_WARNING));
1210 * device_script - run a program to connect or disconnect the
1214 device_script(program, in, out)
1223 sigaddset(&mask, SIGINT);
1224 sigaddset(&mask, SIGHUP);
1225 sigprocmask(SIG_BLOCK, &mask, &mask);
1230 syslog(LOG_ERR, "fork: %m");
1235 setreuid(getuid(), getuid());
1236 setregid(getgid(), getgid());
1237 sigprocmask(SIG_SETMASK, &mask, NULL);
1240 execl("/bin/sh", "sh", "-c", program, (char *)0);
1241 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1246 while (waitpid(pid, &status, 0) < 0) {
1249 syslog(LOG_ERR, "waiting for (dis)connection process: %m");
1252 sigprocmask(SIG_SETMASK, &mask, NULL);
1254 return (status == 0 ? 0 : -1);
1259 * run-program - execute a program with given arguments,
1260 * but don't wait for it.
1261 * If the program can't be executed, logs an error unless
1262 * must_exist is 0 and the program file doesn't exist.
1265 run_program(prog, args, must_exist)
1274 syslog(LOG_ERR, "can't fork to run %s: %m", prog);
1279 if (must_exist || errno != ENOENT)
1280 syslog(LOG_WARNING, "can't execute %s: %m", prog);
1283 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1290 * reap_kids - get status from any dead child processes,
1291 * and log a message for abnormal terminations.
1298 if (n_children == 0)
1300 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1301 if (errno != ECHILD)
1302 syslog(LOG_ERR, "waitpid: %m");
1307 if (WIFSIGNALED(status)) {
1308 syslog(LOG_WARNING, "child process %d terminated with signal %d",
1309 pid, WTERMSIG(status));
1316 * log_packet - format a packet and log it.
1319 char line[256]; /* line to be logged accumulated here */
1323 log_packet(p, len, prefix)
1328 strcpy(line, prefix);
1329 linep = line + strlen(line);
1330 format_packet(p, len, pr_log, NULL);
1332 syslog(LOG_DEBUG, "%s", line);
1336 * format_packet - make a readable representation of a packet,
1337 * calling `printer(arg, format, ...)' to output it.
1340 format_packet(p, len, printer, arg)
1343 void (*printer) __ARGS((void *, char *, ...));
1350 if (len >= DLLHEADERLEN && p[0] == ALLSTATIONS && p[1] == UI) {
1353 len -= DLLHEADERLEN;
1354 for (i = 0; i < N_PROTO; ++i)
1355 if (proto == prottbl[i].protocol)
1358 printer(arg, "[%s", prottbl[i].name);
1359 n = (*prottbl[i].printpkt)(p, len, printer, arg);
1364 printer(arg, "[proto=0x%x]", proto);
1368 for (; len > 0; --len) {
1370 printer(arg, " %.2x", x);
1378 pr_log(void *arg, char *fmt, ...)
1384 va_start(pvar, fmt);
1385 vsprintf(buf, fmt, pvar);
1389 if (linep + n + 1 > line + sizeof(line)) {
1390 syslog(LOG_DEBUG, "%s", line);
1397 #else /* __STDC__ */
1398 #include <varargs.h>
1401 pr_log(arg, fmt, va_alist)
1411 vsprintf(buf, fmt, pvar);
1415 if (linep + n + 1 > line + sizeof(line)) {
1416 syslog(LOG_DEBUG, "%s", line);
1425 * print_string - print a readable representation of a string using
1429 print_string(p, len, printer, arg)
1432 void (*printer) __ARGS((void *, char *, ...));
1438 for (; len > 0; --len) {
1440 if (' ' <= c && c <= '~')
1441 printer(arg, "%c", c);
1443 printer(arg, "\\%.3o", c);
1449 * novm - log an error message saying we ran out of memory, and die.
1455 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);