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 1.45 1998/03/25 01:28:14 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 */
89 int phase; /* where the link is at */
92 int redirect_stderr; /* Connector's stderr should go to file */
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)
259 redirect_stderr = !nodetach || default_device;
262 * Initialize system-dependent stuff and magic number package.
267 setlogmask(LOG_UPTO(LOG_DEBUG));
270 * Detach ourselves from the terminal, if required,
271 * and identify who is running us.
273 if (!default_device && !nodetach && daemon(0, 0) < 0) {
274 perror("Couldn't detach from controlling terminal");
281 if (pw != NULL && pw->pw_name != NULL)
286 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
287 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
290 * Compute mask of all interesting signals and install signal handlers
291 * for each. Only one signal handler may be active at a time. Therefore,
292 * all other signals should be masked when any handler is executing.
295 sigaddset(&mask, SIGHUP);
296 sigaddset(&mask, SIGINT);
297 sigaddset(&mask, SIGTERM);
298 sigaddset(&mask, SIGCHLD);
300 #define SIGNAL(s, handler) { \
301 sa.sa_handler = handler; \
302 if (sigaction(s, &sa, NULL) < 0) { \
303 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
310 SIGNAL(SIGHUP, hup); /* Hangup */
311 SIGNAL(SIGINT, term); /* Interrupt */
312 SIGNAL(SIGTERM, term); /* Terminate */
313 SIGNAL(SIGCHLD, chld);
315 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
316 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
319 * Install a handler for other signals which would otherwise
320 * cause pppd to exit without cleaning up.
322 SIGNAL(SIGABRT, bad_signal);
323 SIGNAL(SIGALRM, bad_signal);
324 SIGNAL(SIGFPE, bad_signal);
325 SIGNAL(SIGILL, bad_signal);
326 SIGNAL(SIGPIPE, bad_signal);
327 SIGNAL(SIGQUIT, bad_signal);
328 SIGNAL(SIGSEGV, bad_signal);
330 SIGNAL(SIGBUS, bad_signal);
333 SIGNAL(SIGEMT, bad_signal);
336 SIGNAL(SIGPOLL, bad_signal);
339 SIGNAL(SIGPROF, bad_signal);
342 SIGNAL(SIGSYS, bad_signal);
345 SIGNAL(SIGTRAP, bad_signal);
348 SIGNAL(SIGVTALRM, bad_signal);
351 SIGNAL(SIGXCPU, bad_signal);
354 SIGNAL(SIGXFSZ, bad_signal);
358 * Apparently we can get a SIGPIPE when we call syslog, if
359 * syslogd has died and been restarted. Ignoring it seems
362 signal(SIGPIPE, SIG_IGN);
365 * If we're doing dial-on-demand, set up the interface now.
369 * Open the loopback channel and set it up to be the ppp interface.
373 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
374 (void) sprintf(ifname, "ppp%d", ifunit);
375 script_setenv("IFNAME", ifname);
377 /* write pid to file */
378 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
379 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
380 fprintf(pidfile, "%d\n", pid);
381 (void) fclose(pidfile);
383 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
388 * Configure the interface and mark it up, etc.
399 * Don't do anything until we see some activity.
401 phase = PHASE_DORMANT;
405 wait_loop_output(timeleft(&timo));
412 if (get_loop_output())
418 * Now we want to bring up the link.
421 syslog(LOG_INFO, "Starting link");
425 * Lock the device if we've been asked to.
427 if (lockflag && !default_device) {
428 if (lock(devnam) < 0)
434 * Open the serial device and set it up to be the ppp interface.
435 * First we open it in non-blocking mode so we can set the
436 * various termios flags appropriately. If we aren't dialling
437 * out and we want to use the modem lines, we reopen it later
438 * in order to wait for the carrier detect signal from the modem.
440 while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
442 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
443 if (!persist || errno != EINTR)
446 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
447 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
449 "Couldn't reset non-blocking mode on device: %m");
455 * Do the equivalent of `mesg n' to stop broadcast messages.
457 if (fstat(ttyfd, &statbuf) < 0
458 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
460 "Couldn't restrict write permissions to %s: %m", devnam);
462 tty_mode = statbuf.st_mode;
464 /* run connection script */
465 if (connector && connector[0]) {
466 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
469 * Set line speed, flow control, etc.
470 * On most systems we set CLOCAL for now so that we can talk
471 * to the modem before carrier comes up. But this has the
472 * side effect that we might miss it if CD drops before we
473 * get to clear CLOCAL below. On systems where we can talk
474 * successfully to the modem with CLOCAL clear and CD down,
475 * we can clear CLOCAL at this point.
477 set_up_tty(ttyfd, 1);
479 /* drop dtr to hang up in case modem is off hook */
480 if (!default_device && modem) {
481 setdtr(ttyfd, FALSE);
486 if (device_script(connector, ttyfd, ttyfd) < 0) {
487 syslog(LOG_ERR, "Connect script failed");
488 setdtr(ttyfd, FALSE);
493 syslog(LOG_INFO, "Serial connection established.");
494 sleep(1); /* give it time to set up its terminal */
497 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
498 set_up_tty(ttyfd, 0);
500 /* reopen tty if necessary to wait for carrier */
501 if (connector == NULL && modem) {
502 while ((i = open(devnam, O_RDWR)) < 0) {
504 syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
505 if (!persist || errno != EINTR || hungup || kill_link)
511 /* run welcome script, if any */
512 if (welcomer && welcomer[0]) {
513 if (device_script(welcomer, ttyfd, ttyfd) < 0)
514 syslog(LOG_WARNING, "Welcome script failed");
517 /* set up the serial device as a ppp interface */
518 establish_ppp(ttyfd);
522 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
523 (void) sprintf(ifname, "ppp%d", ifunit);
524 script_setenv("IFNAME", ifname);
526 /* write pid to file */
527 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
528 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
529 fprintf(pidfile, "%d\n", pid);
530 (void) fclose(pidfile);
532 syslog(LOG_ERR, "Failed to create pid file %s: %m",
539 * Start opening the connection and wait for
540 * incoming events (reply, timeout, etc.).
542 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
544 lcp_open(0); /* Start protocol */
545 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
546 wait_input(timeleft(&timo));
550 lcp_close(0, "User request");
554 if (phase == PHASE_NETWORK) {
555 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
556 (*ccp_protent.open)(0);
560 reap_kids(); /* Don't leave dead kids lying around */
564 * If we may want to bring the link up again, transfer
565 * the ppp unit back to the loopback. Set the
566 * real serial device back to its normal mode of operation.
571 disestablish_ppp(ttyfd);
574 * Run disconnector script, if requested.
575 * XXX we may not be able to do this if the line has hung up!
577 if (disconnector && !hungup) {
578 set_up_tty(ttyfd, 1);
579 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
580 syslog(LOG_WARNING, "disconnect script failed");
582 syslog(LOG_INFO, "Serial link disconnected.");
595 if (pidfilename[0] != 0
596 && unlink(pidfilename) < 0 && errno != ENOENT)
597 syslog(LOG_WARNING, "unable to delete pid file: %m");
606 if (holdoff > 0 && need_holdoff) {
607 phase = PHASE_HOLDOFF;
608 TIMEOUT(holdoff_end, NULL, holdoff);
610 wait_time(timeleft(&timo));
616 phase = PHASE_DORMANT; /* allow signal to end holdoff */
619 } while (phase == PHASE_HOLDOFF);
628 * holdoff_end - called via a timeout when the holdoff period ends.
634 phase = PHASE_DORMANT;
638 * get_input - called when incoming data is available.
646 struct protent *protp;
648 p = inpacket_buf; /* point to beginning of packet buffer */
650 len = read_packet(inpacket_buf);
655 syslog(LOG_NOTICE, "Modem hangup");
657 lcp_lowerdown(0); /* serial link is no longer available */
662 if (debug /*&& (debugflags & DBG_INPACKET)*/)
663 log_packet(p, len, "rcvd ", LOG_DEBUG);
665 if (len < PPP_HDRLEN) {
666 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
670 p += 2; /* Skip address and control */
671 GETSHORT(protocol, p);
675 * Toss all non-LCP packets unless LCP is OPEN.
677 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
679 "get_input: Received non-LCP packet when LCP not open."));
684 * Until we get past the authentication phase, toss all packets
685 * except LCP, LQR and authentication packets.
687 if (phase <= PHASE_AUTHENTICATE
688 && !(protocol == PPP_LCP || protocol == PPP_LQR
689 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
690 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
696 * Upcall the proper protocol input routine.
698 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
699 if (protp->protocol == protocol && protp->enabled_flag) {
700 (*protp->input)(0, p, len);
703 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
704 && protp->datainput != NULL) {
705 (*protp->datainput)(0, p, len);
711 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
712 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
717 * quit - Clean up state and exit (with an error indication).
726 * die - like quit, except we can specify an exit status.
733 syslog(LOG_INFO, "Exit.");
738 * cleanup - restore anything which needs to be restored before we exit
749 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
750 syslog(LOG_WARNING, "unable to delete pid file: %m");
758 * close_tty - restore the terminal device and close it.
763 disestablish_ppp(ttyfd);
765 /* drop dtr to hang up */
767 setdtr(ttyfd, FALSE);
769 * This sleep is in case the serial port has CLOCAL set by default,
770 * and consequently will reassert DTR when we close the device.
777 if (tty_mode != (mode_t) -1)
778 chmod(devnam, tty_mode);
786 struct timeval c_time; /* time at which to call routine */
787 void *c_arg; /* argument to routine */
788 void (*c_func) __P((void *)); /* routine */
789 struct callout *c_next;
792 static struct callout *callout = NULL; /* Callout list */
793 static struct timeval timenow; /* Current time */
796 * timeout - Schedule a timeout.
798 * Note that this timeout takes the number of seconds, NOT hz (as in
802 timeout(func, arg, time)
803 void (*func) __P((void *));
807 struct callout *newp, *p, **pp;
809 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
810 (long) func, (long) arg, time));
815 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
816 syslog(LOG_ERR, "Out of memory in timeout()!");
821 gettimeofday(&timenow, NULL);
822 newp->c_time.tv_sec = timenow.tv_sec + time;
823 newp->c_time.tv_usec = timenow.tv_usec;
826 * Find correct place and link it in.
828 for (pp = &callout; (p = *pp); pp = &p->c_next)
829 if (newp->c_time.tv_sec < p->c_time.tv_sec
830 || (newp->c_time.tv_sec == p->c_time.tv_sec
831 && newp->c_time.tv_usec < p->c_time.tv_sec))
839 * untimeout - Unschedule a timeout.
843 void (*func) __P((void *));
846 struct callout **copp, *freep;
848 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
851 * Find first matching timeout and remove it from the list.
853 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
854 if (freep->c_func == func && freep->c_arg == arg) {
855 *copp = freep->c_next;
856 (void) free((char *) freep);
863 * calltimeout - Call any timeout routines which are now due.
870 while (callout != NULL) {
873 if (gettimeofday(&timenow, NULL) < 0) {
874 syslog(LOG_ERR, "Failed to get time of day: %m");
877 if (!(p->c_time.tv_sec < timenow.tv_sec
878 || (p->c_time.tv_sec == timenow.tv_sec
879 && p->c_time.tv_usec <= timenow.tv_usec)))
880 break; /* no, it's not time yet */
883 (*p->c_func)(p->c_arg);
891 * timeleft - return the length of time until the next timeout is due.
893 static struct timeval *
900 gettimeofday(&timenow, NULL);
901 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
902 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
903 if (tvp->tv_usec < 0) {
904 tvp->tv_usec += 1000000;
908 tvp->tv_sec = tvp->tv_usec = 0;
915 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
921 struct sigaction act, oldact;
923 act.sa_handler = SIG_IGN;
926 sigaction(sig, &act, &oldact);
927 sigaction(sig, &oldact, NULL);
932 * hup - Catch SIGHUP signal.
934 * Indicates that the physical layer has been disconnected.
935 * We don't rely on this indication; if the user has sent this
936 * signal, we just take the link down.
942 syslog(LOG_INFO, "Hangup (SIGHUP)");
945 /* Send the signal to the [dis]connector process(es) also */
951 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
953 * Indicates that we should initiate a graceful disconnect and exit.
960 syslog(LOG_INFO, "Terminating on signal %d.", sig);
961 persist = 0; /* don't try to restart */
964 /* Send the signal to the [dis]connector process(es) also */
970 * chld - Catch SIGCHLD signal.
971 * Calls reap_kids to get status for any dead kids.
982 * toggle_debug - Catch SIGUSR1 signal.
993 setlogmask(LOG_UPTO(LOG_DEBUG));
995 setlogmask(LOG_UPTO(LOG_WARNING));
1001 * open_ccp - Catch SIGUSR2 signal.
1003 * Try to (re)negotiate compression.
1015 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1021 syslog(LOG_ERR, "Fatal signal %d", sig);
1023 kill_my_pg(SIGTERM);
1029 * device_script - run a program to connect or disconnect the
1033 device_script(program, in, out)
1046 syslog(LOG_ERR, "Failed to create child process: %m");
1071 if (redirect_stderr) {
1073 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1074 if (errfd >= 0 && errfd != 2) {
1081 execl("/bin/sh", "sh", "-c", program, (char *)0);
1082 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1087 while (waitpid(pid, &status, 0) < 0) {
1090 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1095 return (status == 0 ? 0 : -1);
1100 * run-program - execute a program with given arguments,
1101 * but don't wait for it.
1102 * If the program can't be executed, logs an error unless
1103 * must_exist is 0 and the program file doesn't exist.
1106 run_program(prog, args, must_exist)
1115 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1121 /* Leave the current location */
1122 (void) setsid(); /* No controlling tty. */
1123 (void) umask (S_IRWXG|S_IRWXO);
1124 (void) chdir ("/"); /* no current directory. */
1128 /* Ensure that nothing of our device environment is inherited. */
1134 close (ttyfd); /* tty interface to the ppp device */
1136 /* Don't pass handles to the PPP device, even by accident. */
1137 new_fd = open (_PATH_DEVNULL, O_RDWR);
1140 dup2 (new_fd, 0); /* stdin <- /dev/null */
1143 dup2 (0, 1); /* stdout -> /dev/null */
1144 dup2 (0, 2); /* stderr -> /dev/null */
1148 /* Force the priority back to zero if pppd is running higher. */
1149 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1150 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1153 /* SysV recommends a second fork at this point. */
1155 /* run the program; give it a null environment */
1156 execve(prog, args, script_env);
1157 if (must_exist || errno != ENOENT)
1158 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1161 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1168 * reap_kids - get status from any dead child processes,
1169 * and log a message for abnormal terminations.
1176 if (n_children == 0)
1178 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1179 if (errno != ECHILD)
1180 syslog(LOG_ERR, "Error waiting for child process: %m");
1185 if (WIFSIGNALED(status)) {
1186 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1187 pid, WTERMSIG(status));
1194 * log_packet - format a packet and log it.
1197 char line[256]; /* line to be logged accumulated here */
1201 log_packet(p, len, prefix, level)
1207 strcpy(line, prefix);
1208 linep = line + strlen(line);
1209 format_packet(p, len, pr_log, NULL);
1211 syslog(level, "%s", line);
1215 * format_packet - make a readable representation of a packet,
1216 * calling `printer(arg, format, ...)' to output it.
1219 format_packet(p, len, printer, arg)
1222 void (*printer) __P((void *, char *, ...));
1228 struct protent *protp;
1230 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1234 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1235 if (proto == protp->protocol)
1237 if (protp != NULL) {
1238 printer(arg, "[%s", protp->name);
1239 n = (*protp->printpkt)(p, len, printer, arg);
1244 printer(arg, "[proto=0x%x]", proto);
1248 for (; len > 0; --len) {
1250 printer(arg, " %.2x", x);
1255 pr_log __V((void *arg, char *fmt, ...))
1262 va_start(pvar, fmt);
1267 arg = va_arg(pvar, void *);
1268 fmt = va_arg(pvar, char *);
1271 vsprintf(buf, fmt, pvar);
1275 if (linep + n + 1 > line + sizeof(line)) {
1276 syslog(LOG_DEBUG, "%s", line);
1284 * print_string - print a readable representation of a string using
1288 print_string(p, len, printer, arg)
1291 void (*printer) __P((void *, char *, ...));
1297 for (; len > 0; --len) {
1299 if (' ' <= c && c <= '~') {
1300 if (c == '\\' || c == '"')
1302 printer(arg, "%c", c);
1306 printer(arg, "\\n");
1309 printer(arg, "\\r");
1312 printer(arg, "\\t");
1315 printer(arg, "\\%.3o", c);
1323 * novm - log an error message saying we ran out of memory, and die.
1329 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1334 * fmtmsg - format a message into a buffer. Like sprintf except we
1335 * also specify the length of the output buffer, and we handle
1336 * %r (recursive format), %m (error message) and %I (IP address) formats.
1337 * Doesn't do floating-point formats.
1338 * Returns the number of chars put into buf.
1341 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1347 va_start(args, fmt);
1353 buf = va_arg(args, char *);
1354 buflen = va_arg(args, int);
1355 fmt = va_arg(args, char *);
1357 n = vfmtmsg(buf, buflen, fmt, args);
1363 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1365 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1368 vfmtmsg(buf, buflen, fmt, args)
1375 int width, prec, fillch;
1376 int base, len, neg, quoted;
1377 unsigned long val = 0;
1378 char *str, *f, *buf0;
1382 static char hexchars[] = "0123456789abcdef";
1386 while (buflen > 0) {
1387 for (f = fmt; *f != '%' && *f != 0; ++f)
1393 memcpy(buf, fmt, len);
1408 width = va_arg(args, int);
1411 while (isdigit(c)) {
1412 width = width * 10 + c - '0';
1419 prec = va_arg(args, int);
1422 while (isdigit(c)) {
1423 prec = prec * 10 + c - '0';
1434 i = va_arg(args, int);
1443 val = va_arg(args, unsigned int);
1447 val = va_arg(args, unsigned int);
1451 val = (unsigned long) va_arg(args, void *);
1456 str = va_arg(args, char *);
1459 num[0] = va_arg(args, int);
1464 str = strerror(errno);
1467 str = ip_ntoa(va_arg(args, u_int32_t));
1470 f = va_arg(args, char *);
1472 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
1474 /* On the powerpc, a va_list is an array of 1 structure */
1475 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
1483 str += 4; /* chop off the day name */
1484 str[15] = 0; /* chop off year and newline */
1486 case 'v': /* "visible" string */
1487 case 'q': /* quoted string */
1489 p = va_arg(args, unsigned char *);
1490 if (fillch == '0' && prec > 0) {
1493 n = strlen((char *)p);
1494 if (prec > 0 && prec < n)
1497 while (n > 0 && buflen > 0) {
1500 if (!quoted && c >= 0x80) {
1505 if (quoted && (c == '"' || c == '\\'))
1507 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1511 case '\t': OUTCHAR('t'); break;
1512 case '\n': OUTCHAR('n'); break;
1513 case '\b': OUTCHAR('b'); break;
1514 case '\f': OUTCHAR('f'); break;
1517 OUTCHAR(hexchars[c >> 4]);
1518 OUTCHAR(hexchars[c & 0xf]);
1535 --fmt; /* so %z outputs %z etc. */
1540 str = num + sizeof(num);
1542 while (str > num + neg) {
1543 *--str = hexchars[val % base];
1545 if (--prec <= 0 && val == 0)
1557 len = num + sizeof(num) - 1 - str;
1560 if (prec > 0 && len > prec)
1566 if ((n = width - len) > 0) {
1574 memcpy(buf, str, len);
1583 * script_setenv - set an environment variable value to be used
1584 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1587 script_setenv(var, value)
1590 int vl = strlen(var);
1592 char *p, *newstring;
1594 newstring = (char *) malloc(vl + strlen(value) + 2);
1597 strcpy(newstring, var);
1598 newstring[vl] = '=';
1599 strcpy(newstring+vl+1, value);
1601 /* check if this variable is already set */
1602 if (script_env != 0) {
1603 for (i = 0; (p = script_env[i]) != 0; ++i) {
1604 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1606 script_env[i] = newstring;
1612 script_env = (char **) malloc(16 * sizeof(char *));
1613 if (script_env == 0)
1618 /* reallocate script_env with more space if needed */
1619 if (i + 1 >= s_env_nalloc) {
1621 char **newenv = (char **) realloc((void *)script_env,
1622 new_n * sizeof(char *));
1625 script_env = newenv;
1626 s_env_nalloc = new_n;
1629 script_env[i] = newstring;
1630 script_env[i+1] = 0;
1634 * script_unsetenv - remove a variable from the environment
1638 script_unsetenv(var)
1641 int vl = strlen(var);
1645 if (script_env == 0)
1647 for (i = 0; (p = script_env[i]) != 0; ++i) {
1648 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1650 while ((script_env[i] = script_env[i+1]) != 0)