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 1.40 1997/03/04 03:41:17 paulus Exp $";
35 #include <sys/param.h>
36 #include <sys/types.h>
39 #include <sys/resource.h>
41 #include <sys/socket.h>
52 #include "pathnames.h"
53 #include "patchlevel.h"
60 extern char *strerror();
65 #endif /* IPX_CHANGE */
71 char ifname[IFNAMSIZ]; /* 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 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
95 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
97 static int n_children; /* # child processes still running */
99 static int locked; /* lock() has succeeded */
101 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
103 /* Prototypes for procedures local to this file. */
105 static void cleanup __P((void));
106 static void close_tty __P((void));
107 static void get_input __P((void));
108 static void calltimeout __P((void));
109 static struct timeval *timeleft __P((struct timeval *));
110 static void hup __P((int));
111 static void term __P((int));
112 static void chld __P((int));
113 static void toggle_debug __P((int));
114 static void open_ccp __P((int));
115 static void bad_signal __P((int));
116 static void holdoff_end __P((void *));
117 static int device_script __P((char *, int, int));
118 static void reap_kids __P((void));
119 static void pr_log __P((void *, char *, ...));
121 extern char *ttyname __P((int));
122 extern char *getlogin __P((void));
126 #define O_NONBLOCK O_NDELAY
130 #define setlogmask(x)
134 * PPP Data Link Layer "protocol" table.
135 * One entry per supported protocol.
136 * The last entry must be NULL.
138 struct protent *protocols[] = {
161 int i, nonblock, fdflags;
168 struct protent *protp;
171 phase = PHASE_INITIALIZE;
175 strcpy(default_devnam, devnam);
177 /* Initialize syslog facilities */
179 openlog("pppd", LOG_PID);
181 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
182 setlogmask(LOG_UPTO(LOG_INFO));
185 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
186 option_error("Couldn't get hostname: %m");
189 hostname[MAXNAMELEN-1] = 0;
192 privileged = uid == 0;
195 * Initialize to the standard option set, then parse, in order,
196 * the system options file, the user's options file,
197 * the tty's options file, and the command line arguments.
199 for (i = 0; (protp = protocols[i]) != NULL; ++i)
204 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
205 || !options_from_user())
207 scan_args(argc-1, argv+1); /* look for tty name on command line */
208 if (!options_for_tty()
209 || !parse_args(argc-1, argv+1))
213 * Check that we are running as root.
215 if (geteuid() != 0) {
216 option_error("must be root to run %s, since it is not setuid-root",
221 if (!ppp_available()) {
222 option_error(no_ppp_msg);
227 * Check that the options given are valid and consistent.
230 auth_check_options();
231 for (i = 0; (protp = protocols[i]) != NULL; ++i)
232 if (protp->check_options != NULL)
233 (*protp->check_options)();
234 if (demand && connector == 0) {
235 option_error("connect script required for demand-dialling\n");
240 * If the user has specified the default device name explicitly,
241 * pretend they hadn't.
243 if (!default_device && strcmp(devnam, default_devnam) == 0)
245 redirect_stderr = !nodetach || default_device;
248 * Initialize system-dependent stuff and magic number package.
253 setlogmask(LOG_UPTO(LOG_DEBUG));
256 * Detach ourselves from the terminal, if required,
257 * and identify who is running us.
259 if (!default_device && !nodetach && daemon(0, 0) < 0) {
260 perror("Couldn't detach from controlling terminal");
267 if (pw != NULL && pw->pw_name != NULL)
272 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
273 VERSION, PATCHLEVEL, p, uid);
276 * Compute mask of all interesting signals and install signal handlers
277 * for each. Only one signal handler may be active at a time. Therefore,
278 * all other signals should be masked when any handler is executing.
281 sigaddset(&mask, SIGHUP);
282 sigaddset(&mask, SIGINT);
283 sigaddset(&mask, SIGTERM);
284 sigaddset(&mask, SIGCHLD);
286 #define SIGNAL(s, handler) { \
287 sa.sa_handler = handler; \
288 if (sigaction(s, &sa, NULL) < 0) { \
289 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
296 SIGNAL(SIGHUP, hup); /* Hangup */
297 SIGNAL(SIGINT, term); /* Interrupt */
298 SIGNAL(SIGTERM, term); /* Terminate */
299 SIGNAL(SIGCHLD, chld);
301 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
302 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
305 * Install a handler for other signals which would otherwise
306 * cause pppd to exit without cleaning up.
308 SIGNAL(SIGABRT, bad_signal);
309 SIGNAL(SIGALRM, bad_signal);
310 SIGNAL(SIGFPE, bad_signal);
311 SIGNAL(SIGILL, bad_signal);
312 SIGNAL(SIGPIPE, bad_signal);
313 SIGNAL(SIGQUIT, bad_signal);
314 SIGNAL(SIGSEGV, bad_signal);
316 SIGNAL(SIGBUS, bad_signal);
319 SIGNAL(SIGEMT, bad_signal);
322 SIGNAL(SIGPOLL, bad_signal);
325 SIGNAL(SIGPROF, bad_signal);
328 SIGNAL(SIGSYS, bad_signal);
331 SIGNAL(SIGTRAP, bad_signal);
334 SIGNAL(SIGVTALRM, bad_signal);
337 SIGNAL(SIGXCPU, bad_signal);
340 SIGNAL(SIGXFSZ, bad_signal);
344 * Apparently we can get a SIGPIPE when we call syslog, if
345 * syslogd has died and been restarted. Ignoring it seems
348 signal(SIGPIPE, SIG_IGN);
351 * If we're doing dial-on-demand, set up the interface now.
355 * Open the loopback channel and set it up to be the ppp interface.
359 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
360 (void) sprintf(ifname, "ppp%d", ifunit);
362 /* write pid to file */
363 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
364 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
365 fprintf(pidfile, "%d\n", pid);
366 (void) fclose(pidfile);
368 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
373 * Configure the interface and mark it up, etc.
384 * Don't do anything until we see some activity.
386 phase = PHASE_DORMANT;
390 wait_loop_output(timeleft(&timo));
397 if (get_loop_output())
403 * Now we want to bring up the link.
406 syslog(LOG_INFO, "Starting link");
410 * Lock the device if we've been asked to.
412 if (lockflag && !default_device) {
413 if (lock(devnam) < 0)
419 * Open the serial device and set it up to be the ppp interface.
420 * If we're dialling out, or we don't want to use the modem lines,
421 * we open it in non-blocking mode, but then we need to clear
422 * the non-blocking I/O bit.
424 nonblock = (connector || !modem)? O_NONBLOCK: 0;
425 while ((ttyfd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
427 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
428 if (!persist || errno != EINTR)
432 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
433 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
435 "Couldn't reset non-blocking mode on device: %m");
441 * Do the equivalent of `mesg n' to stop broadcast messages.
443 if (fstat(ttyfd, &statbuf) < 0
444 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
446 "Couldn't restrict write permissions to %s: %m", devnam);
448 tty_mode = statbuf.st_mode;
450 /* run connection script */
451 if (connector && connector[0]) {
452 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
454 /* set line speed, flow control, etc.; set CLOCAL for now */
455 set_up_tty(ttyfd, 1);
457 /* drop dtr to hang up in case modem is off hook */
458 if (!default_device && modem) {
459 setdtr(ttyfd, FALSE);
464 if (device_script(connector, ttyfd, ttyfd) < 0) {
465 syslog(LOG_ERR, "Connect script failed");
466 setdtr(ttyfd, FALSE);
470 syslog(LOG_INFO, "Serial connection established.");
471 sleep(1); /* give it time to set up its terminal */
474 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
475 set_up_tty(ttyfd, 0);
477 /* run welcome script, if any */
478 if (welcomer && welcomer[0]) {
479 if (device_script(welcomer, ttyfd, ttyfd) < 0)
480 syslog(LOG_WARNING, "Welcome script failed");
483 /* set up the serial device as a ppp interface */
484 establish_ppp(ttyfd);
488 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
489 (void) sprintf(ifname, "ppp%d", ifunit);
491 /* write pid to file */
492 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
493 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
494 fprintf(pidfile, "%d\n", pid);
495 (void) fclose(pidfile);
497 syslog(LOG_ERR, "Failed to create pid file %s: %m",
504 * Start opening the connection and wait for
505 * incoming events (reply, timeout, etc.).
507 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
509 lcp_open(0); /* Start protocol */
510 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
511 wait_input(timeleft(&timo));
515 lcp_close(0, "User request");
519 if (phase == PHASE_NETWORK) {
520 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
521 (*ccp_protent.open)(0);
525 reap_kids(); /* Don't leave dead kids lying around */
529 * If we may want to bring the link up again, transfer
530 * the ppp unit back to the loopback. Set the
531 * real serial device back to its normal mode of operation.
536 disestablish_ppp(ttyfd);
539 * Run disconnector script, if requested.
540 * XXX we may not be able to do this if the line has hung up!
542 if (disconnector && !hungup) {
543 set_up_tty(ttyfd, 1);
544 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
545 syslog(LOG_WARNING, "disconnect script failed");
547 syslog(LOG_INFO, "Serial link disconnected.");
560 if (pidfilename[0] != 0
561 && unlink(pidfilename) < 0 && errno != ENOENT)
562 syslog(LOG_WARNING, "unable to delete pid file: %m");
571 if (holdoff > 0 && need_holdoff) {
572 phase = PHASE_HOLDOFF;
573 TIMEOUT(holdoff_end, NULL, holdoff);
575 wait_time(timeleft(&timo));
581 phase = PHASE_DORMANT; /* allow signal to end holdoff */
584 } while (phase == PHASE_HOLDOFF);
592 * holdoff_end - called via a timeout when the holdoff period ends.
598 phase = PHASE_DORMANT;
602 * get_input - called when incoming data is available.
610 struct protent *protp;
612 p = inpacket_buf; /* point to beginning of packet buffer */
614 len = read_packet(inpacket_buf);
619 syslog(LOG_NOTICE, "Modem hangup");
621 lcp_lowerdown(0); /* serial link is no longer available */
626 if (debug /*&& (debugflags & DBG_INPACKET)*/)
627 log_packet(p, len, "rcvd ");
629 if (len < PPP_HDRLEN) {
630 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
634 p += 2; /* Skip address and control */
635 GETSHORT(protocol, p);
639 * Toss all non-LCP packets unless LCP is OPEN.
641 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
643 "get_input: Received non-LCP packet when LCP not open."));
648 * Until we get past the authentication phase, toss all packets
649 * except LCP, LQR and authentication packets.
651 if (phase <= PHASE_AUTHENTICATE
652 && !(protocol == PPP_LCP || protocol == PPP_LQR
653 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
654 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
660 * Upcall the proper protocol input routine.
662 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
663 if (protp->protocol == protocol && protp->enabled_flag) {
664 (*protp->input)(0, p, len);
667 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
668 && protp->datainput != NULL) {
669 (*protp->datainput)(0, p, len);
675 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
676 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
681 * quit - Clean up state and exit (with an error indication).
690 * die - like quit, except we can specify an exit status.
697 syslog(LOG_INFO, "Exit.");
702 * cleanup - restore anything which needs to be restored before we exit
713 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
714 syslog(LOG_WARNING, "unable to delete pid file: %m");
722 * close_tty - restore the terminal device and close it.
727 disestablish_ppp(ttyfd);
729 /* drop dtr to hang up */
731 setdtr(ttyfd, FALSE);
733 * This sleep is in case the serial port has CLOCAL set by default,
734 * and consequently will reassert DTR when we close the device.
741 if (tty_mode != (mode_t) -1)
742 chmod(devnam, tty_mode);
750 struct timeval c_time; /* time at which to call routine */
751 caddr_t c_arg; /* argument to routine */
752 void (*c_func)(); /* routine */
753 struct callout *c_next;
756 static struct callout *callout = NULL; /* Callout list */
757 static struct timeval timenow; /* Current time */
760 * timeout - Schedule a timeout.
762 * Note that this timeout takes the number of seconds, NOT hz (as in
766 timeout(func, arg, time)
771 struct callout *newp, *p, **pp;
773 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
774 (long) func, (long) arg, time));
779 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
780 syslog(LOG_ERR, "Out of memory in timeout()!");
785 gettimeofday(&timenow, NULL);
786 newp->c_time.tv_sec = timenow.tv_sec + time;
787 newp->c_time.tv_usec = timenow.tv_usec;
790 * Find correct place and link it in.
792 for (pp = &callout; (p = *pp); pp = &p->c_next)
793 if (newp->c_time.tv_sec < p->c_time.tv_sec
794 || (newp->c_time.tv_sec == p->c_time.tv_sec
795 && newp->c_time.tv_usec < p->c_time.tv_sec))
803 * untimeout - Unschedule a timeout.
810 struct callout **copp, *freep;
812 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
815 * Find first matching timeout and remove it from the list.
817 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
818 if (freep->c_func == func && freep->c_arg == arg) {
819 *copp = freep->c_next;
820 (void) free((char *) freep);
827 * calltimeout - Call any timeout routines which are now due.
834 while (callout != NULL) {
837 if (gettimeofday(&timenow, NULL) < 0) {
838 syslog(LOG_ERR, "Failed to get time of day: %m");
841 if (!(p->c_time.tv_sec < timenow.tv_sec
842 || (p->c_time.tv_sec == timenow.tv_sec
843 && p->c_time.tv_usec <= timenow.tv_usec)))
844 break; /* no, it's not time yet */
847 (*p->c_func)(p->c_arg);
855 * timeleft - return the length of time until the next timeout is due.
857 static struct timeval *
864 gettimeofday(&timenow, NULL);
865 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
866 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
867 if (tvp->tv_usec < 0) {
868 tvp->tv_usec += 1000000;
872 tvp->tv_sec = tvp->tv_usec = 0;
879 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
885 struct sigaction act, oldact;
887 act.sa_handler = SIG_IGN;
890 sigaction(sig, &act, &oldact);
891 sigaction(sig, &oldact, NULL);
896 * hup - Catch SIGHUP signal.
898 * Indicates that the physical layer has been disconnected.
899 * We don't rely on this indication; if the user has sent this
900 * signal, we just take the link down.
906 syslog(LOG_INFO, "Hangup (SIGHUP)");
909 /* Send the signal to the [dis]connector process(es) also */
915 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
917 * Indicates that we should initiate a graceful disconnect and exit.
924 syslog(LOG_INFO, "Terminating on signal %d.", sig);
925 persist = 0; /* don't try to restart */
928 /* Send the signal to the [dis]connector process(es) also */
934 * chld - Catch SIGCHLD signal.
935 * Calls reap_kids to get status for any dead kids.
946 * toggle_debug - Catch SIGUSR1 signal.
957 setlogmask(LOG_UPTO(LOG_DEBUG));
959 setlogmask(LOG_UPTO(LOG_WARNING));
965 * open_ccp - Catch SIGUSR2 signal.
967 * Try to (re)negotiate compression.
979 * bad_signal - We've caught a fatal signal. Clean up state and exit.
985 syslog(LOG_ERR, "Fatal signal %d", sig);
993 * device_script - run a program to connect or disconnect the
997 device_script(program, in, out)
1010 syslog(LOG_ERR, "Failed to create child process: %m");
1035 if (redirect_stderr) {
1037 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1038 if (errfd >= 0 && errfd != 2) {
1045 execl("/bin/sh", "sh", "-c", program, (char *)0);
1046 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1051 while (waitpid(pid, &status, 0) < 0) {
1054 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1059 return (status == 0 ? 0 : -1);
1064 * run-program - execute a program with given arguments,
1065 * but don't wait for it.
1066 * If the program can't be executed, logs an error unless
1067 * must_exist is 0 and the program file doesn't exist.
1070 run_program(prog, args, must_exist)
1080 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1086 /* Leave the current location */
1087 (void) setsid(); /* No controlling tty. */
1088 (void) umask (S_IRWXG|S_IRWXO);
1089 (void) chdir ("/"); /* no current directory. */
1093 /* Ensure that nothing of our device environment is inherited. */
1099 close (ttyfd); /* tty interface to the ppp device */
1101 /* Don't pass handles to the PPP device, even by accident. */
1102 new_fd = open (_PATH_DEVNULL, O_RDWR);
1105 dup2 (new_fd, 0); /* stdin <- /dev/null */
1108 dup2 (0, 1); /* stdout -> /dev/null */
1109 dup2 (0, 2); /* stderr -> /dev/null */
1113 /* Force the priority back to zero if pppd is running higher. */
1114 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1115 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1118 /* SysV recommends a second fork at this point. */
1120 /* run the program; give it a null environment */
1122 execve(prog, args, nullenv);
1123 if (must_exist || errno != ENOENT)
1124 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1127 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1134 * reap_kids - get status from any dead child processes,
1135 * and log a message for abnormal terminations.
1142 if (n_children == 0)
1144 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1145 if (errno != ECHILD)
1146 syslog(LOG_ERR, "Error waiting for child process: %m");
1151 if (WIFSIGNALED(status)) {
1152 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1153 pid, WTERMSIG(status));
1160 * log_packet - format a packet and log it.
1163 char line[256]; /* line to be logged accumulated here */
1167 log_packet(p, len, prefix)
1172 strcpy(line, prefix);
1173 linep = line + strlen(line);
1174 format_packet(p, len, pr_log, NULL);
1176 syslog(LOG_DEBUG, "%s", line);
1180 * format_packet - make a readable representation of a packet,
1181 * calling `printer(arg, format, ...)' to output it.
1184 format_packet(p, len, printer, arg)
1187 void (*printer) __P((void *, char *, ...));
1193 struct protent *protp;
1195 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1199 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1200 if (proto == protp->protocol)
1202 if (protp != NULL) {
1203 printer(arg, "[%s", protp->name);
1204 n = (*protp->printpkt)(p, len, printer, arg);
1209 printer(arg, "[proto=0x%x]", proto);
1213 for (; len > 0; --len) {
1215 printer(arg, " %.2x", x);
1220 pr_log __V((void *arg, char *fmt, ...))
1227 va_start(pvar, fmt);
1232 arg = va_arg(pvar, void *);
1233 fmt = va_arg(pvar, char *);
1236 vsprintf(buf, fmt, pvar);
1240 if (linep + n + 1 > line + sizeof(line)) {
1241 syslog(LOG_DEBUG, "%s", line);
1249 * print_string - print a readable representation of a string using
1253 print_string(p, len, printer, arg)
1256 void (*printer) __P((void *, char *, ...));
1262 for (; len > 0; --len) {
1264 if (' ' <= c && c <= '~') {
1265 if (c == '\\' || c == '"')
1267 printer(arg, "%c", c);
1271 printer(arg, "\\n");
1274 printer(arg, "\\r");
1277 printer(arg, "\\t");
1280 printer(arg, "\\%.3o", c);
1288 * novm - log an error message saying we ran out of memory, and die.
1294 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1299 * fmtmsg - format a message into a buffer. Like sprintf except we
1300 * also specify the length of the output buffer, and we handle
1301 * %r (recursive format), %m (error message) and %I (IP address) formats.
1302 * Doesn't do floating-point formats.
1303 * Returns the number of chars put into buf.
1306 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1312 va_start(args, fmt);
1318 buf = va_arg(args, char *);
1319 buflen = va_arg(args, int);
1320 fmt = va_arg(args, char *);
1322 n = vfmtmsg(buf, buflen, fmt, args);
1328 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1330 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1333 vfmtmsg(buf, buflen, fmt, args)
1340 int width, prec, fillch;
1341 int base, len, neg, quoted;
1343 char *str, *f, *buf0;
1348 static char hexchars[] = "0123456789abcdef";
1352 while (buflen > 0) {
1353 for (f = fmt; *f != '%' && *f != 0; ++f)
1359 memcpy(buf, fmt, len);
1374 width = va_arg(args, int);
1377 while (isdigit(c)) {
1378 width = width * 10 + c - '0';
1385 prec = va_arg(args, int);
1388 while (isdigit(c)) {
1389 prec = prec * 10 + c - '0';
1400 i = va_arg(args, int);
1409 val = va_arg(args, unsigned int);
1413 val = va_arg(args, unsigned int);
1417 val = (unsigned long) va_arg(args, void *);
1422 str = va_arg(args, char *);
1425 num[0] = va_arg(args, int);
1430 str = strerror(errno);
1433 str = ip_ntoa(va_arg(args, u_int32_t));
1436 f = va_arg(args, char *);
1438 * XXX We assume a va_list is either a pointer or an array, so
1439 * what gets passed for a va_list is like a void * in some sense.
1441 a = va_arg(args, void *);
1442 n = vfmtmsg(buf, buflen + 1, f, a);
1449 str += 4; /* chop off the day name */
1450 str[15] = 0; /* chop off year and newline */
1452 case 'v': /* "visible" string */
1453 case 'q': /* quoted string */
1455 p = va_arg(args, unsigned char *);
1456 if (fillch == '0' && prec > 0) {
1459 n = strlen((char *)p);
1460 if (prec > 0 && prec < n)
1463 while (n > 0 && buflen > 0) {
1466 if (!quoted && c >= 0x80) {
1471 if (quoted && (c == '"' || c == '\\'))
1473 if (c < 0x20 || 0x7f <= c && c < 0xa0) {
1477 case '\t': OUTCHAR('t'); break;
1478 case '\n': OUTCHAR('n'); break;
1479 case '\b': OUTCHAR('b'); break;
1480 case '\f': OUTCHAR('f'); break;
1483 OUTCHAR(hexchars[c >> 4]);
1484 OUTCHAR(hexchars[c & 0xf]);
1501 --fmt; /* so %z outputs %z etc. */
1506 str = num + sizeof(num);
1508 while (str > num + neg) {
1509 *--str = hexchars[val % base];
1511 if (--prec <= 0 && val == 0)
1523 len = num + sizeof(num) - 1 - str;
1526 if (prec > 0 && len > prec)
1532 if ((n = width - len) > 0) {
1540 memcpy(buf, str, len);