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 1.46 1998/03/26 04:46:04 paulus Exp $";
36 #include <sys/param.h>
37 #include <sys/types.h>
40 #include <sys/resource.h>
42 #include <sys/socket.h>
52 #include "pathnames.h"
53 #include "patchlevel.h"
60 extern char *strerror();
65 #endif /* IPX_CHANGE */
71 char ifname[32]; /* Interface name */
72 int ifunit; /* Interface unit number */
74 char *progname; /* Name of this program */
75 char hostname[MAXNAMELEN]; /* Our hostname */
76 static char pidfilename[MAXPATHLEN]; /* name of pid file */
77 static char default_devnam[MAXPATHLEN]; /* name of default device */
78 static pid_t pid; /* Our pid */
79 static uid_t uid; /* Our real user-id */
80 static int conn_running; /* we have a [dis]connector running */
82 int ttyfd = -1; /* Serial port file descriptor */
83 mode_t tty_mode = -1; /* Original access permissions to tty */
84 int baud_rate; /* Actual bits/second for serial device */
85 int hungup; /* terminal has been hung up */
86 int privileged; /* we're running as real uid root */
87 int need_holdoff; /* need holdoff period before restarting */
88 int detached; /* have detached from terminal */
90 int phase; /* where the link is at */
94 char **script_env; /* Env. variable values for scripts */
95 int s_env_nalloc; /* # words avail at script_env */
97 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
98 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
100 static int n_children; /* # child processes still running */
102 static int locked; /* lock() has succeeded */
104 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
106 /* Prototypes for procedures local to this file. */
108 static void cleanup __P((void));
109 static void close_tty __P((void));
110 static void get_input __P((void));
111 static void calltimeout __P((void));
112 static struct timeval *timeleft __P((struct timeval *));
113 static void kill_my_pg __P((int));
114 static void hup __P((int));
115 static void term __P((int));
116 static void chld __P((int));
117 static void toggle_debug __P((int));
118 static void open_ccp __P((int));
119 static void bad_signal __P((int));
120 static void holdoff_end __P((void *));
121 static int device_script __P((char *, int, int));
122 static void reap_kids __P((void));
123 static void pr_log __P((void *, char *, ...));
125 extern char *ttyname __P((int));
126 extern char *getlogin __P((void));
127 int main __P((int, char *[]));
131 #define O_NONBLOCK O_NDELAY
135 #define setlogmask(x)
139 * PPP Data Link Layer "protocol" table.
140 * One entry per supported protocol.
141 * The last entry must be NULL.
143 struct protent *protocols[] = {
173 struct protent *protp;
177 phase = PHASE_INITIALIZE;
181 strcpy(default_devnam, devnam);
185 /* Initialize syslog facilities */
187 openlog("pppd", LOG_PID);
189 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
190 setlogmask(LOG_UPTO(LOG_INFO));
193 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
194 option_error("Couldn't get hostname: %m");
197 hostname[MAXNAMELEN-1] = 0;
200 privileged = uid == 0;
201 sprintf(numbuf, "%d", uid);
202 script_setenv("UID", numbuf);
205 * Initialize to the standard option set, then parse, in order,
206 * the system options file, the user's options file,
207 * the tty's options file, and the command line arguments.
209 for (i = 0; (protp = protocols[i]) != NULL; ++i)
214 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
215 || !options_from_user())
217 scan_args(argc-1, argv+1); /* look for tty name on command line */
218 if (!options_for_tty()
219 || !parse_args(argc-1, argv+1))
223 * Check that we are running as root.
225 if (geteuid() != 0) {
226 option_error("must be root to run %s, since it is not setuid-root",
231 if (!ppp_available()) {
232 option_error(no_ppp_msg);
237 * Check that the options given are valid and consistent.
240 auth_check_options();
241 for (i = 0; (protp = protocols[i]) != NULL; ++i)
242 if (protp->check_options != NULL)
243 (*protp->check_options)();
244 if (demand && connector == 0) {
245 option_error("connect script required for demand-dialling\n");
249 script_setenv("DEVICE", devnam);
250 sprintf(numbuf, "%d", baud_rate);
251 script_setenv("SPEED", numbuf);
254 * If the user has specified the default device name explicitly,
255 * pretend they hadn't.
257 if (!default_device && strcmp(devnam, default_devnam) == 0)
263 * Initialize system-dependent stuff and magic number package.
268 setlogmask(LOG_UPTO(LOG_DEBUG));
271 * Detach ourselves from the terminal, if required,
272 * and identify who is running us.
280 if (pw != NULL && pw->pw_name != NULL)
285 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
286 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
289 * Compute mask of all interesting signals and install signal handlers
290 * for each. Only one signal handler may be active at a time. Therefore,
291 * all other signals should be masked when any handler is executing.
294 sigaddset(&mask, SIGHUP);
295 sigaddset(&mask, SIGINT);
296 sigaddset(&mask, SIGTERM);
297 sigaddset(&mask, SIGCHLD);
299 #define SIGNAL(s, handler) { \
300 sa.sa_handler = handler; \
301 if (sigaction(s, &sa, NULL) < 0) { \
302 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
309 SIGNAL(SIGHUP, hup); /* Hangup */
310 SIGNAL(SIGINT, term); /* Interrupt */
311 SIGNAL(SIGTERM, term); /* Terminate */
312 SIGNAL(SIGCHLD, chld);
314 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
315 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
318 * Install a handler for other signals which would otherwise
319 * cause pppd to exit without cleaning up.
321 SIGNAL(SIGABRT, bad_signal);
322 SIGNAL(SIGALRM, bad_signal);
323 SIGNAL(SIGFPE, bad_signal);
324 SIGNAL(SIGILL, bad_signal);
325 SIGNAL(SIGPIPE, bad_signal);
326 SIGNAL(SIGQUIT, bad_signal);
327 SIGNAL(SIGSEGV, bad_signal);
329 SIGNAL(SIGBUS, bad_signal);
332 SIGNAL(SIGEMT, bad_signal);
335 SIGNAL(SIGPOLL, bad_signal);
338 SIGNAL(SIGPROF, bad_signal);
341 SIGNAL(SIGSYS, bad_signal);
344 SIGNAL(SIGTRAP, bad_signal);
347 SIGNAL(SIGVTALRM, bad_signal);
350 SIGNAL(SIGXCPU, bad_signal);
353 SIGNAL(SIGXFSZ, bad_signal);
357 * Apparently we can get a SIGPIPE when we call syslog, if
358 * syslogd has died and been restarted. Ignoring it seems
361 signal(SIGPIPE, SIG_IGN);
364 * If we're doing dial-on-demand, set up the interface now.
368 * Open the loopback channel and set it up to be the ppp interface.
372 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
373 (void) sprintf(ifname, "ppp%d", ifunit);
374 script_setenv("IFNAME", ifname);
376 /* write pid to file */
377 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
378 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
379 fprintf(pidfile, "%d\n", pid);
380 (void) fclose(pidfile);
382 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
387 * Configure the interface and mark it up, etc.
398 * Don't do anything until we see some activity.
400 phase = PHASE_DORMANT;
404 wait_loop_output(timeleft(&timo));
411 if (get_loop_output())
417 * Now we want to bring up the link.
420 syslog(LOG_INFO, "Starting link");
424 * Lock the device if we've been asked to.
426 if (lockflag && !default_device) {
427 if (lock(devnam) < 0)
433 * Open the serial device and set it up to be the ppp interface.
434 * First we open it in non-blocking mode so we can set the
435 * various termios flags appropriately. If we aren't dialling
436 * out and we want to use the modem lines, we reopen it later
437 * in order to wait for the carrier detect signal from the modem.
439 while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
441 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
442 if (!persist || errno != EINTR)
445 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
446 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
448 "Couldn't reset non-blocking mode on device: %m");
454 * Do the equivalent of `mesg n' to stop broadcast messages.
456 if (fstat(ttyfd, &statbuf) < 0
457 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
459 "Couldn't restrict write permissions to %s: %m", devnam);
461 tty_mode = statbuf.st_mode;
463 /* run connection script */
464 if (connector && connector[0]) {
465 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
468 * Set line speed, flow control, etc.
469 * On most systems we set CLOCAL for now so that we can talk
470 * to the modem before carrier comes up. But this has the
471 * side effect that we might miss it if CD drops before we
472 * get to clear CLOCAL below. On systems where we can talk
473 * successfully to the modem with CLOCAL clear and CD down,
474 * we can clear CLOCAL at this point.
476 set_up_tty(ttyfd, 1);
478 /* drop dtr to hang up in case modem is off hook */
479 if (!default_device && modem) {
480 setdtr(ttyfd, FALSE);
485 if (device_script(connector, ttyfd, ttyfd) < 0) {
486 syslog(LOG_ERR, "Connect script failed");
487 setdtr(ttyfd, FALSE);
492 syslog(LOG_INFO, "Serial connection established.");
493 sleep(1); /* give it time to set up its terminal */
496 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
497 set_up_tty(ttyfd, 0);
499 /* reopen tty if necessary to wait for carrier */
500 if (connector == NULL && modem) {
501 while ((i = open(devnam, O_RDWR)) < 0) {
503 syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
504 if (!persist || errno != EINTR || hungup || kill_link)
510 /* run welcome script, if any */
511 if (welcomer && welcomer[0]) {
512 if (device_script(welcomer, ttyfd, ttyfd) < 0)
513 syslog(LOG_WARNING, "Welcome script failed");
516 /* set up the serial device as a ppp interface */
517 establish_ppp(ttyfd);
521 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
522 (void) sprintf(ifname, "ppp%d", ifunit);
523 script_setenv("IFNAME", ifname);
525 /* write pid to file */
526 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
527 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
528 fprintf(pidfile, "%d\n", pid);
529 (void) fclose(pidfile);
531 syslog(LOG_ERR, "Failed to create pid file %s: %m",
538 * Start opening the connection and wait for
539 * incoming events (reply, timeout, etc.).
541 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
543 lcp_open(0); /* Start protocol */
544 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
545 wait_input(timeleft(&timo));
549 lcp_close(0, "User request");
553 if (phase == PHASE_NETWORK) {
554 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
555 (*ccp_protent.open)(0);
559 reap_kids(); /* Don't leave dead kids lying around */
563 * If we may want to bring the link up again, transfer
564 * the ppp unit back to the loopback. Set the
565 * real serial device back to its normal mode of operation.
570 disestablish_ppp(ttyfd);
573 * Run disconnector script, if requested.
574 * XXX we may not be able to do this if the line has hung up!
576 if (disconnector && !hungup) {
577 set_up_tty(ttyfd, 1);
578 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
579 syslog(LOG_WARNING, "disconnect script failed");
581 syslog(LOG_INFO, "Serial link disconnected.");
594 if (pidfilename[0] != 0
595 && unlink(pidfilename) < 0 && errno != ENOENT)
596 syslog(LOG_WARNING, "unable to delete pid file: %m");
605 if (holdoff > 0 && need_holdoff) {
606 phase = PHASE_HOLDOFF;
607 TIMEOUT(holdoff_end, NULL, holdoff);
609 wait_time(timeleft(&timo));
615 phase = PHASE_DORMANT; /* allow signal to end holdoff */
618 } while (phase == PHASE_HOLDOFF);
627 * detach - detach us from the controlling terminal.
634 if (daemon(0, 0) < 0) {
635 perror("Couldn't detach from controlling terminal");
642 * holdoff_end - called via a timeout when the holdoff period ends.
648 phase = PHASE_DORMANT;
652 * get_input - called when incoming data is available.
660 struct protent *protp;
662 p = inpacket_buf; /* point to beginning of packet buffer */
664 len = read_packet(inpacket_buf);
669 syslog(LOG_NOTICE, "Modem hangup");
671 lcp_lowerdown(0); /* serial link is no longer available */
676 if (debug /*&& (debugflags & DBG_INPACKET)*/)
677 log_packet(p, len, "rcvd ", LOG_DEBUG);
679 if (len < PPP_HDRLEN) {
680 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
684 p += 2; /* Skip address and control */
685 GETSHORT(protocol, p);
689 * Toss all non-LCP packets unless LCP is OPEN.
691 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
693 "get_input: Received non-LCP packet when LCP not open."));
698 * Until we get past the authentication phase, toss all packets
699 * except LCP, LQR and authentication packets.
701 if (phase <= PHASE_AUTHENTICATE
702 && !(protocol == PPP_LCP || protocol == PPP_LQR
703 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
704 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
710 * Upcall the proper protocol input routine.
712 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
713 if (protp->protocol == protocol && protp->enabled_flag) {
714 (*protp->input)(0, p, len);
717 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
718 && protp->datainput != NULL) {
719 (*protp->datainput)(0, p, len);
725 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
726 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
731 * quit - Clean up state and exit (with an error indication).
740 * die - like quit, except we can specify an exit status.
747 syslog(LOG_INFO, "Exit.");
752 * cleanup - restore anything which needs to be restored before we exit
763 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
764 syslog(LOG_WARNING, "unable to delete pid file: %m");
772 * close_tty - restore the terminal device and close it.
777 disestablish_ppp(ttyfd);
779 /* drop dtr to hang up */
781 setdtr(ttyfd, FALSE);
783 * This sleep is in case the serial port has CLOCAL set by default,
784 * and consequently will reassert DTR when we close the device.
791 if (tty_mode != (mode_t) -1)
792 chmod(devnam, tty_mode);
800 struct timeval c_time; /* time at which to call routine */
801 void *c_arg; /* argument to routine */
802 void (*c_func) __P((void *)); /* routine */
803 struct callout *c_next;
806 static struct callout *callout = NULL; /* Callout list */
807 static struct timeval timenow; /* Current time */
810 * timeout - Schedule a timeout.
812 * Note that this timeout takes the number of seconds, NOT hz (as in
816 timeout(func, arg, time)
817 void (*func) __P((void *));
821 struct callout *newp, *p, **pp;
823 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
824 (long) func, (long) arg, time));
829 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
830 syslog(LOG_ERR, "Out of memory in timeout()!");
835 gettimeofday(&timenow, NULL);
836 newp->c_time.tv_sec = timenow.tv_sec + time;
837 newp->c_time.tv_usec = timenow.tv_usec;
840 * Find correct place and link it in.
842 for (pp = &callout; (p = *pp); pp = &p->c_next)
843 if (newp->c_time.tv_sec < p->c_time.tv_sec
844 || (newp->c_time.tv_sec == p->c_time.tv_sec
845 && newp->c_time.tv_usec < p->c_time.tv_sec))
853 * untimeout - Unschedule a timeout.
857 void (*func) __P((void *));
860 struct callout **copp, *freep;
862 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
865 * Find first matching timeout and remove it from the list.
867 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
868 if (freep->c_func == func && freep->c_arg == arg) {
869 *copp = freep->c_next;
870 (void) free((char *) freep);
877 * calltimeout - Call any timeout routines which are now due.
884 while (callout != NULL) {
887 if (gettimeofday(&timenow, NULL) < 0) {
888 syslog(LOG_ERR, "Failed to get time of day: %m");
891 if (!(p->c_time.tv_sec < timenow.tv_sec
892 || (p->c_time.tv_sec == timenow.tv_sec
893 && p->c_time.tv_usec <= timenow.tv_usec)))
894 break; /* no, it's not time yet */
897 (*p->c_func)(p->c_arg);
905 * timeleft - return the length of time until the next timeout is due.
907 static struct timeval *
914 gettimeofday(&timenow, NULL);
915 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
916 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
917 if (tvp->tv_usec < 0) {
918 tvp->tv_usec += 1000000;
922 tvp->tv_sec = tvp->tv_usec = 0;
929 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
935 struct sigaction act, oldact;
937 act.sa_handler = SIG_IGN;
940 sigaction(sig, &act, &oldact);
941 sigaction(sig, &oldact, NULL);
946 * hup - Catch SIGHUP signal.
948 * Indicates that the physical layer has been disconnected.
949 * We don't rely on this indication; if the user has sent this
950 * signal, we just take the link down.
956 syslog(LOG_INFO, "Hangup (SIGHUP)");
959 /* Send the signal to the [dis]connector process(es) also */
965 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
967 * Indicates that we should initiate a graceful disconnect and exit.
974 syslog(LOG_INFO, "Terminating on signal %d.", sig);
975 persist = 0; /* don't try to restart */
978 /* Send the signal to the [dis]connector process(es) also */
984 * chld - Catch SIGCHLD signal.
985 * Calls reap_kids to get status for any dead kids.
996 * toggle_debug - Catch SIGUSR1 signal.
1007 setlogmask(LOG_UPTO(LOG_DEBUG));
1009 setlogmask(LOG_UPTO(LOG_WARNING));
1015 * open_ccp - Catch SIGUSR2 signal.
1017 * Try to (re)negotiate compression.
1029 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1035 syslog(LOG_ERR, "Fatal signal %d", sig);
1037 kill_my_pg(SIGTERM);
1043 * device_script - run a program to connect or disconnect the
1047 device_script(program, in, out)
1060 syslog(LOG_ERR, "Failed to create child process: %m");
1085 if (nodetach == 0) {
1087 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1088 if (errfd >= 0 && errfd != 2) {
1095 execl("/bin/sh", "sh", "-c", program, (char *)0);
1096 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1101 while (waitpid(pid, &status, 0) < 0) {
1104 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1109 return (status == 0 ? 0 : -1);
1114 * run-program - execute a program with given arguments,
1115 * but don't wait for it.
1116 * If the program can't be executed, logs an error unless
1117 * must_exist is 0 and the program file doesn't exist.
1120 run_program(prog, args, must_exist)
1129 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1135 /* Leave the current location */
1136 (void) setsid(); /* No controlling tty. */
1137 (void) umask (S_IRWXG|S_IRWXO);
1138 (void) chdir ("/"); /* no current directory. */
1142 /* Ensure that nothing of our device environment is inherited. */
1148 close (ttyfd); /* tty interface to the ppp device */
1150 /* Don't pass handles to the PPP device, even by accident. */
1151 new_fd = open (_PATH_DEVNULL, O_RDWR);
1154 dup2 (new_fd, 0); /* stdin <- /dev/null */
1157 dup2 (0, 1); /* stdout -> /dev/null */
1158 dup2 (0, 2); /* stderr -> /dev/null */
1162 /* Force the priority back to zero if pppd is running higher. */
1163 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1164 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1167 /* SysV recommends a second fork at this point. */
1169 /* run the program; give it a null environment */
1170 execve(prog, args, script_env);
1171 if (must_exist || errno != ENOENT)
1172 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1175 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1182 * reap_kids - get status from any dead child processes,
1183 * and log a message for abnormal terminations.
1190 if (n_children == 0)
1192 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1193 if (errno != ECHILD)
1194 syslog(LOG_ERR, "Error waiting for child process: %m");
1199 if (WIFSIGNALED(status)) {
1200 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1201 pid, WTERMSIG(status));
1208 * log_packet - format a packet and log it.
1211 char line[256]; /* line to be logged accumulated here */
1215 log_packet(p, len, prefix, level)
1221 strcpy(line, prefix);
1222 linep = line + strlen(line);
1223 format_packet(p, len, pr_log, NULL);
1225 syslog(level, "%s", line);
1229 * format_packet - make a readable representation of a packet,
1230 * calling `printer(arg, format, ...)' to output it.
1233 format_packet(p, len, printer, arg)
1236 void (*printer) __P((void *, char *, ...));
1242 struct protent *protp;
1244 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1248 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1249 if (proto == protp->protocol)
1251 if (protp != NULL) {
1252 printer(arg, "[%s", protp->name);
1253 n = (*protp->printpkt)(p, len, printer, arg);
1258 printer(arg, "[proto=0x%x]", proto);
1262 for (; len > 0; --len) {
1264 printer(arg, " %.2x", x);
1269 pr_log __V((void *arg, char *fmt, ...))
1276 va_start(pvar, fmt);
1281 arg = va_arg(pvar, void *);
1282 fmt = va_arg(pvar, char *);
1285 vsprintf(buf, fmt, pvar);
1289 if (linep + n + 1 > line + sizeof(line)) {
1290 syslog(LOG_DEBUG, "%s", line);
1298 * print_string - print a readable representation of a string using
1302 print_string(p, len, printer, arg)
1305 void (*printer) __P((void *, char *, ...));
1311 for (; len > 0; --len) {
1313 if (' ' <= c && c <= '~') {
1314 if (c == '\\' || c == '"')
1316 printer(arg, "%c", c);
1320 printer(arg, "\\n");
1323 printer(arg, "\\r");
1326 printer(arg, "\\t");
1329 printer(arg, "\\%.3o", c);
1337 * novm - log an error message saying we ran out of memory, and die.
1343 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1348 * fmtmsg - format a message into a buffer. Like sprintf except we
1349 * also specify the length of the output buffer, and we handle
1350 * %r (recursive format), %m (error message) and %I (IP address) formats.
1351 * Doesn't do floating-point formats.
1352 * Returns the number of chars put into buf.
1355 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1361 va_start(args, fmt);
1367 buf = va_arg(args, char *);
1368 buflen = va_arg(args, int);
1369 fmt = va_arg(args, char *);
1371 n = vfmtmsg(buf, buflen, fmt, args);
1377 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1379 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1382 vfmtmsg(buf, buflen, fmt, args)
1389 int width, prec, fillch;
1390 int base, len, neg, quoted;
1391 unsigned long val = 0;
1392 char *str, *f, *buf0;
1396 static char hexchars[] = "0123456789abcdef";
1400 while (buflen > 0) {
1401 for (f = fmt; *f != '%' && *f != 0; ++f)
1407 memcpy(buf, fmt, len);
1422 width = va_arg(args, int);
1425 while (isdigit(c)) {
1426 width = width * 10 + c - '0';
1433 prec = va_arg(args, int);
1436 while (isdigit(c)) {
1437 prec = prec * 10 + c - '0';
1448 i = va_arg(args, int);
1457 val = va_arg(args, unsigned int);
1461 val = va_arg(args, unsigned int);
1465 val = (unsigned long) va_arg(args, void *);
1470 str = va_arg(args, char *);
1473 num[0] = va_arg(args, int);
1478 str = strerror(errno);
1481 str = ip_ntoa(va_arg(args, u_int32_t));
1484 f = va_arg(args, char *);
1486 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
1488 /* On the powerpc, a va_list is an array of 1 structure */
1489 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
1497 str += 4; /* chop off the day name */
1498 str[15] = 0; /* chop off year and newline */
1500 case 'v': /* "visible" string */
1501 case 'q': /* quoted string */
1503 p = va_arg(args, unsigned char *);
1504 if (fillch == '0' && prec > 0) {
1507 n = strlen((char *)p);
1508 if (prec > 0 && prec < n)
1511 while (n > 0 && buflen > 0) {
1514 if (!quoted && c >= 0x80) {
1519 if (quoted && (c == '"' || c == '\\'))
1521 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1525 case '\t': OUTCHAR('t'); break;
1526 case '\n': OUTCHAR('n'); break;
1527 case '\b': OUTCHAR('b'); break;
1528 case '\f': OUTCHAR('f'); break;
1531 OUTCHAR(hexchars[c >> 4]);
1532 OUTCHAR(hexchars[c & 0xf]);
1549 --fmt; /* so %z outputs %z etc. */
1554 str = num + sizeof(num);
1556 while (str > num + neg) {
1557 *--str = hexchars[val % base];
1559 if (--prec <= 0 && val == 0)
1571 len = num + sizeof(num) - 1 - str;
1574 if (prec > 0 && len > prec)
1580 if ((n = width - len) > 0) {
1588 memcpy(buf, str, len);
1597 * script_setenv - set an environment variable value to be used
1598 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1601 script_setenv(var, value)
1604 int vl = strlen(var);
1606 char *p, *newstring;
1608 newstring = (char *) malloc(vl + strlen(value) + 2);
1611 strcpy(newstring, var);
1612 newstring[vl] = '=';
1613 strcpy(newstring+vl+1, value);
1615 /* check if this variable is already set */
1616 if (script_env != 0) {
1617 for (i = 0; (p = script_env[i]) != 0; ++i) {
1618 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1620 script_env[i] = newstring;
1626 script_env = (char **) malloc(16 * sizeof(char *));
1627 if (script_env == 0)
1632 /* reallocate script_env with more space if needed */
1633 if (i + 1 >= s_env_nalloc) {
1635 char **newenv = (char **) realloc((void *)script_env,
1636 new_n * sizeof(char *));
1639 script_env = newenv;
1640 s_env_nalloc = new_n;
1643 script_env[i] = newstring;
1644 script_env[i+1] = 0;
1648 * script_unsetenv - remove a variable from the environment
1652 script_unsetenv(var)
1655 int vl = strlen(var);
1659 if (script_env == 0)
1661 for (i = 0; (p = script_env[i]) != 0; ++i) {
1662 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1664 while ((script_env[i] = script_env[i+1]) != 0)