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 1.38 1996/10/08 04:35:03 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 */
68 char ifname[IFNAMSIZ]; /* Interface name */
69 int ifunit; /* Interface unit number */
71 char *progname; /* Name of this program */
72 char hostname[MAXNAMELEN]; /* Our hostname */
73 static char pidfilename[MAXPATHLEN]; /* name of pid file */
74 static char default_devnam[MAXPATHLEN]; /* name of default device */
75 static pid_t pid; /* Our pid */
76 static uid_t uid; /* Our real user-id */
77 static int conn_running; /* we have a [dis]connector running */
79 int ttyfd = -1; /* Serial port file descriptor */
80 mode_t tty_mode = -1; /* Original access permissions to tty */
81 int baud_rate; /* Actual bits/second for serial device */
82 int hungup; /* terminal has been hung up */
83 int privileged; /* we're running as real uid root */
84 int need_holdoff; /* need holdoff period before restarting */
86 int phase; /* where the link is at */
89 int redirect_stderr; /* Connector's stderr should go to file */
91 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
92 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
94 static int n_children; /* # child processes still running */
96 static int locked; /* lock() has succeeded */
98 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
100 /* Prototypes for procedures local to this file. */
102 static void cleanup __P((void));
103 static void close_tty __P((void));
104 static void get_input __P((void));
105 static void connect_time_expired __P((caddr_t));
106 static void calltimeout __P((void));
107 static struct timeval *timeleft __P((struct timeval *));
108 static void hup __P((int));
109 static void term __P((int));
110 static void chld __P((int));
111 static void toggle_debug __P((int));
112 static void open_ccp __P((int));
113 static void bad_signal __P((int));
114 static void holdoff_end __P((void *));
115 static int device_script __P((char *, int, int));
116 static void reap_kids __P((void));
117 static void pr_log __P((void *, char *, ...));
119 extern char *ttyname __P((int));
120 extern char *getlogin __P((void));
124 #define O_NONBLOCK O_NDELAY
128 #define setlogmask(x)
132 * PPP Data Link Layer "protocol" table.
133 * One entry per supported protocol.
134 * The last entry must be NULL.
136 struct protent *protocols[] = {
156 int i, nonblock, fdflags;
163 struct protent *protp;
166 phase = PHASE_INITIALIZE;
170 strcpy(default_devnam, devnam);
172 /* Initialize syslog facilities */
174 openlog("pppd", LOG_PID);
176 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
177 setlogmask(LOG_UPTO(LOG_INFO));
180 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
181 syslog(LOG_ERR, "couldn't get hostname: %m");
184 hostname[MAXNAMELEN-1] = 0;
187 privileged = uid == 0;
190 * Initialize to the standard option set, then parse, in order,
191 * the system options file, the user's options file,
192 * the tty's options file, and the command line arguments.
194 for (i = 0; (protp = protocols[i]) != NULL; ++i)
199 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
200 || !options_from_user())
202 scan_args(argc-1, argv+1); /* look for tty name on command line */
203 if (!options_for_tty()
204 || !parse_args(argc-1, argv+1))
207 if (!ppp_available()) {
208 option_error(no_ppp_msg);
213 * Check that the options given are valid and consistent.
216 auth_check_options();
217 for (i = 0; (protp = protocols[i]) != NULL; ++i)
218 if (protp->check_options != NULL)
219 (*protp->check_options)();
220 if (demand && connector == 0) {
221 option_error("connect script required for demand-dialling\n");
226 * If the user has specified the default device name explicitly,
227 * pretend they hadn't.
229 if (!default_device && strcmp(devnam, default_devnam) == 0)
231 redirect_stderr = !nodetach || default_device;
234 * Initialize system-dependent stuff and magic number package.
239 setlogmask(LOG_UPTO(LOG_DEBUG));
242 * Detach ourselves from the terminal, if required,
243 * and identify who is running us.
245 if (!default_device && !nodetach && daemon(0, 0) < 0) {
246 perror("Couldn't detach from controlling terminal");
253 if (pw != NULL && pw->pw_name != NULL)
258 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
259 VERSION, PATCHLEVEL, p, uid);
262 * Compute mask of all interesting signals and install signal handlers
263 * for each. Only one signal handler may be active at a time. Therefore,
264 * all other signals should be masked when any handler is executing.
267 sigaddset(&mask, SIGHUP);
268 sigaddset(&mask, SIGINT);
269 sigaddset(&mask, SIGTERM);
270 sigaddset(&mask, SIGCHLD);
272 #define SIGNAL(s, handler) { \
273 sa.sa_handler = handler; \
274 if (sigaction(s, &sa, NULL) < 0) { \
275 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
282 SIGNAL(SIGHUP, hup); /* Hangup */
283 SIGNAL(SIGINT, term); /* Interrupt */
284 SIGNAL(SIGTERM, term); /* Terminate */
285 SIGNAL(SIGCHLD, chld);
287 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
288 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
291 * Install a handler for other signals which would otherwise
292 * cause pppd to exit without cleaning up.
294 SIGNAL(SIGABRT, bad_signal);
295 SIGNAL(SIGALRM, bad_signal);
296 SIGNAL(SIGFPE, bad_signal);
297 SIGNAL(SIGILL, bad_signal);
298 SIGNAL(SIGPIPE, bad_signal);
299 SIGNAL(SIGQUIT, bad_signal);
300 SIGNAL(SIGSEGV, bad_signal);
302 SIGNAL(SIGBUS, bad_signal);
305 SIGNAL(SIGEMT, bad_signal);
308 SIGNAL(SIGPOLL, bad_signal);
311 SIGNAL(SIGPROF, bad_signal);
314 SIGNAL(SIGSYS, bad_signal);
317 SIGNAL(SIGTRAP, bad_signal);
320 SIGNAL(SIGVTALRM, bad_signal);
323 SIGNAL(SIGXCPU, bad_signal);
326 SIGNAL(SIGXFSZ, bad_signal);
330 * Apparently we can get a SIGPIPE when we call syslog, if
331 * syslogd has died and been restarted. Ignoring it seems
334 signal(SIGPIPE, SIG_IGN);
337 * If we're doing dial-on-demand, set up the interface now.
341 * Open the loopback channel and set it up to be the ppp interface.
345 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
346 (void) sprintf(ifname, "ppp%d", ifunit);
348 /* write pid to file */
349 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
350 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
351 fprintf(pidfile, "%d\n", pid);
352 (void) fclose(pidfile);
354 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
359 * Configure the interface and mark it up, etc.
370 * Don't do anything until we see some activity.
372 phase = PHASE_DORMANT;
376 wait_loop_output(timeleft(&timo));
383 if (get_loop_output())
389 * Now we want to bring up the link.
392 syslog(LOG_INFO, "Starting link");
396 * Lock the device if we've been asked to.
398 if (lockflag && !default_device) {
399 if (lock(devnam) < 0)
405 * Open the serial device and set it up to be the ppp interface.
406 * If we're dialling out, or we don't want to use the modem lines,
407 * we open it in non-blocking mode, but then we need to clear
408 * the non-blocking I/O bit.
410 nonblock = (connector || !modem)? O_NONBLOCK: 0;
411 if ((ttyfd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
412 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
416 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
417 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
419 "Couldn't reset non-blocking mode on device: %m");
425 * Do the equivalent of `mesg n' to stop broadcast messages.
427 if (fstat(ttyfd, &statbuf) < 0
428 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
430 "Couldn't restrict write permissions to %s: %m", devnam);
432 tty_mode = statbuf.st_mode;
434 /* run connection script */
435 if (connector && connector[0]) {
436 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
438 /* set line speed, flow control, etc.; set CLOCAL for now */
439 set_up_tty(ttyfd, 1);
441 /* drop dtr to hang up in case modem is off hook */
442 if (!default_device && modem) {
443 setdtr(ttyfd, FALSE);
448 if (device_script(connector, ttyfd, ttyfd) < 0) {
449 syslog(LOG_ERR, "Connect script failed");
450 setdtr(ttyfd, FALSE);
454 syslog(LOG_INFO, "Serial connection established.");
455 sleep(1); /* give it time to set up its terminal */
458 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
459 set_up_tty(ttyfd, 0);
461 /* run welcome script, if any */
462 if (welcomer && welcomer[0]) {
463 if (device_script(welcomer, ttyfd, ttyfd) < 0)
464 syslog(LOG_WARNING, "Welcome script failed");
467 /* set up the serial device as a ppp interface */
468 establish_ppp(ttyfd);
472 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
473 (void) sprintf(ifname, "ppp%d", ifunit);
475 /* write pid to file */
476 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
477 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
478 fprintf(pidfile, "%d\n", pid);
479 (void) fclose(pidfile);
481 syslog(LOG_ERR, "Failed to create pid file %s: %m",
488 * Set a timeout to close the connection once the maximum
489 * connect time has expired.
492 TIMEOUT(connect_time_expired, 0, maxconnect);
495 * Start opening the connection and wait for
496 * incoming events (reply, timeout, etc.).
498 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
500 lcp_open(0); /* Start protocol */
501 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
502 wait_input(timeleft(&timo));
506 lcp_close(0, "User request");
510 if (phase == PHASE_NETWORK) {
511 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
512 (*ccp_protent.open)(0);
516 reap_kids(); /* Don't leave dead kids lying around */
520 * If we may want to bring the link up again, transfer
521 * the ppp unit back to the loopback. Set the
522 * real serial device back to its normal mode of operation.
527 disestablish_ppp(ttyfd);
530 * Run disconnector script, if requested.
531 * XXX we may not be able to do this if the line has hung up!
533 if (disconnector && !hungup) {
534 set_up_tty(ttyfd, 1);
535 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
536 syslog(LOG_WARNING, "disconnect script failed");
538 syslog(LOG_INFO, "Serial link disconnected.");
550 if (pidfilename[0] != 0
551 && unlink(pidfilename) < 0 && errno != ENOENT)
552 syslog(LOG_WARNING, "unable to delete pid file: %m");
561 if (holdoff > 0 && need_holdoff) {
562 phase = PHASE_HOLDOFF;
563 TIMEOUT(holdoff_end, NULL, holdoff);
565 wait_time(timeleft(&timo));
571 phase = PHASE_DORMANT; /* allow signal to end holdoff */
574 } while (phase == PHASE_HOLDOFF);
582 * holdoff_end - called via a timeout when the holdoff period ends.
588 phase = PHASE_DORMANT;
592 * get_input - called when incoming data is available.
600 struct protent *protp;
602 p = inpacket_buf; /* point to beginning of packet buffer */
604 len = read_packet(inpacket_buf);
609 syslog(LOG_NOTICE, "Modem hangup");
611 lcp_lowerdown(0); /* serial link is no longer available */
616 if (debug /*&& (debugflags & DBG_INPACKET)*/)
617 log_packet(p, len, "rcvd ");
619 if (len < PPP_HDRLEN) {
620 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
624 p += 2; /* Skip address and control */
625 GETSHORT(protocol, p);
629 * Toss all non-LCP packets unless LCP is OPEN.
631 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
633 "io(): Received non-LCP packet when LCP not open."));
638 * Upcall the proper protocol input routine.
640 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
641 if (protp->protocol == protocol && protp->enabled_flag) {
642 (*protp->input)(0, p, len);
645 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
646 && protp->datainput != NULL) {
647 (*protp->datainput)(0, p, len);
653 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
654 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
659 * quit - Clean up state and exit (with an error indication).
668 * die - like quit, except we can specify an exit status.
675 syslog(LOG_INFO, "Exit.");
680 * connect_time_expired - log a message and close the connection.
683 connect_time_expired(arg)
686 syslog(LOG_INFO, "Connect time expired");
687 lcp_close(0, "Connect time expired"); /* Close connection */
691 * cleanup - restore anything which needs to be restored before we exit
702 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
703 syslog(LOG_WARNING, "unable to delete pid file: %m");
711 * close_tty - restore the terminal device and close it.
716 disestablish_ppp(ttyfd);
718 /* drop dtr to hang up */
720 setdtr(ttyfd, FALSE);
722 * This sleep is in case the serial port has CLOCAL set by default,
723 * and consequently will reassert DTR when we close the device.
730 if (tty_mode != (mode_t) -1)
731 chmod(devnam, tty_mode);
739 struct timeval c_time; /* time at which to call routine */
740 caddr_t c_arg; /* argument to routine */
741 void (*c_func)(); /* routine */
742 struct callout *c_next;
745 static struct callout *callout = NULL; /* Callout list */
746 static struct timeval timenow; /* Current time */
749 * timeout - Schedule a timeout.
751 * Note that this timeout takes the number of seconds, NOT hz (as in
755 timeout(func, arg, time)
760 struct callout *newp, *p, **pp;
762 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
763 (long) func, (long) arg, time));
768 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
769 syslog(LOG_ERR, "Out of memory in timeout()!");
774 gettimeofday(&timenow, NULL);
775 newp->c_time.tv_sec = timenow.tv_sec + time;
776 newp->c_time.tv_usec = timenow.tv_usec;
779 * Find correct place and link it in.
781 for (pp = &callout; (p = *pp); pp = &p->c_next)
782 if (newp->c_time.tv_sec < p->c_time.tv_sec
783 || (newp->c_time.tv_sec == p->c_time.tv_sec
784 && newp->c_time.tv_usec < p->c_time.tv_sec))
792 * untimeout - Unschedule a timeout.
799 struct callout **copp, *freep;
801 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
804 * Find first matching timeout and remove it from the list.
806 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
807 if (freep->c_func == func && freep->c_arg == arg) {
808 *copp = freep->c_next;
809 (void) free((char *) freep);
816 * calltimeout - Call any timeout routines which are now due.
823 while (callout != NULL) {
826 if (gettimeofday(&timenow, NULL) < 0) {
827 syslog(LOG_ERR, "Failed to get time of day: %m");
830 if (!(p->c_time.tv_sec < timenow.tv_sec
831 || (p->c_time.tv_sec == timenow.tv_sec
832 && p->c_time.tv_usec <= timenow.tv_usec)))
833 break; /* no, it's not time yet */
836 (*p->c_func)(p->c_arg);
844 * timeleft - return the length of time until the next timeout is due.
846 static struct timeval *
853 gettimeofday(&timenow, NULL);
854 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
855 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
856 if (tvp->tv_usec < 0) {
857 tvp->tv_usec += 1000000;
861 tvp->tv_sec = tvp->tv_usec = 0;
868 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
874 struct sigaction act, oldact;
876 act.sa_handler = SIG_IGN;
878 sigaction(sig, &act, &oldact);
879 kill(-getpgrp(), sig);
880 sigaction(sig, &oldact, NULL);
885 * hup - Catch SIGHUP signal.
887 * Indicates that the physical layer has been disconnected.
888 * We don't rely on this indication; if the user has sent this
889 * signal, we just take the link down.
895 syslog(LOG_INFO, "Hangup (SIGHUP)");
898 /* Send the signal to the [dis]connector process(es) also */
904 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
906 * Indicates that we should initiate a graceful disconnect and exit.
913 syslog(LOG_INFO, "Terminating on signal %d.", sig);
914 persist = 0; /* don't try to restart */
917 /* Send the signal to the [dis]connector process(es) also */
923 * chld - Catch SIGCHLD signal.
924 * Calls reap_kids to get status for any dead kids.
935 * toggle_debug - Catch SIGUSR1 signal.
946 setlogmask(LOG_UPTO(LOG_DEBUG));
948 setlogmask(LOG_UPTO(LOG_WARNING));
954 * open_ccp - Catch SIGUSR2 signal.
956 * Try to (re)negotiate compression.
968 * bad_signal - We've caught a fatal signal. Clean up state and exit.
974 syslog(LOG_ERR, "Fatal signal %d", sig);
982 * device_script - run a program to connect or disconnect the
986 device_script(program, in, out)
999 syslog(LOG_ERR, "Failed to create child process: %m");
1024 if (redirect_stderr) {
1026 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1027 if (errfd >= 0 && errfd != 2) {
1034 execl("/bin/sh", "sh", "-c", program, (char *)0);
1035 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1040 while (waitpid(pid, &status, 0) < 0) {
1043 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1048 return (status == 0 ? 0 : -1);
1053 * run-program - execute a program with given arguments,
1054 * but don't wait for it.
1055 * If the program can't be executed, logs an error unless
1056 * must_exist is 0 and the program file doesn't exist.
1059 run_program(prog, args, must_exist)
1069 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1075 /* Leave the current location */
1076 (void) setsid(); /* No controlling tty. */
1077 (void) umask (S_IRWXG|S_IRWXO);
1078 (void) chdir ("/"); /* no current directory. */
1082 /* Ensure that nothing of our device environment is inherited. */
1088 close (ttyfd); /* tty interface to the ppp device */
1090 /* Don't pass handles to the PPP device, even by accident. */
1091 new_fd = open (_PATH_DEVNULL, O_RDWR);
1094 dup2 (new_fd, 0); /* stdin <- /dev/null */
1097 dup2 (0, 1); /* stdout -> /dev/null */
1098 dup2 (0, 2); /* stderr -> /dev/null */
1102 /* Force the priority back to zero if pppd is running higher. */
1103 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1104 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1107 /* SysV recommends a second fork at this point. */
1109 /* run the program; give it a null environment */
1111 execve(prog, args, nullenv);
1112 if (must_exist || errno != ENOENT)
1113 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1116 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1123 * reap_kids - get status from any dead child processes,
1124 * and log a message for abnormal terminations.
1131 if (n_children == 0)
1133 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1134 if (errno != ECHILD)
1135 syslog(LOG_ERR, "Error waiting for child process: %m");
1140 if (WIFSIGNALED(status)) {
1141 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1142 pid, WTERMSIG(status));
1149 * log_packet - format a packet and log it.
1152 char line[256]; /* line to be logged accumulated here */
1156 log_packet(p, len, prefix)
1161 strcpy(line, prefix);
1162 linep = line + strlen(line);
1163 format_packet(p, len, pr_log, NULL);
1165 syslog(LOG_DEBUG, "%s", line);
1169 * format_packet - make a readable representation of a packet,
1170 * calling `printer(arg, format, ...)' to output it.
1173 format_packet(p, len, printer, arg)
1176 void (*printer) __P((void *, char *, ...));
1182 struct protent *protp;
1184 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1188 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1189 if (proto == protp->protocol)
1191 if (protp != NULL) {
1192 printer(arg, "[%s", protp->name);
1193 n = (*protp->printpkt)(p, len, printer, arg);
1198 printer(arg, "[proto=0x%x]", proto);
1202 for (; len > 0; --len) {
1204 printer(arg, " %.2x", x);
1209 pr_log __V((void *arg, char *fmt, ...))
1216 va_start(pvar, fmt);
1221 arg = va_arg(pvar, void *);
1222 fmt = va_arg(pvar, char *);
1225 vsprintf(buf, fmt, pvar);
1229 if (linep + n + 1 > line + sizeof(line)) {
1230 syslog(LOG_DEBUG, "%s", line);
1238 * print_string - print a readable representation of a string using
1242 print_string(p, len, printer, arg)
1245 void (*printer) __P((void *, char *, ...));
1251 for (; len > 0; --len) {
1253 if (' ' <= c && c <= '~') {
1254 if (c == '\\' || c == '"')
1256 printer(arg, "%c", c);
1260 printer(arg, "\\n");
1263 printer(arg, "\\r");
1266 printer(arg, "\\t");
1269 printer(arg, "\\%.3o", c);
1277 * novm - log an error message saying we ran out of memory, and die.
1283 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1288 * fmtmsg - format a message into a buffer. Like sprintf except we
1289 * also specify the length of the output buffer, and we handle
1290 * %r (recursive format), %m (error message) and %I (IP address) formats.
1291 * Doesn't do floating-point formats.
1292 * Returns the number of chars put into buf.
1295 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1301 va_start(args, fmt);
1307 buf = va_arg(args, char *);
1308 buflen = va_arg(args, int);
1309 fmt = va_arg(args, char *);
1311 n = vfmtmsg(buf, buflen, fmt, args);
1317 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1319 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1322 vfmtmsg(buf, buflen, fmt, args)
1329 int width, prec, fillch;
1330 int base, len, neg, quoted;
1332 char *str, *f, *buf0;
1337 static char hexchars[] = "0123456789abcdef";
1341 while (buflen > 0) {
1342 for (f = fmt; *f != '%' && *f != 0; ++f)
1348 memcpy(buf, fmt, len);
1363 width = va_arg(args, int);
1366 while (isdigit(c)) {
1367 width = width * 10 + c - '0';
1374 prec = va_arg(args, int);
1377 while (isdigit(c)) {
1378 prec = prec * 10 + c - '0';
1389 i = va_arg(args, int);
1398 val = va_arg(args, unsigned int);
1402 val = va_arg(args, unsigned int);
1406 val = (unsigned long) va_arg(args, void *);
1411 str = va_arg(args, char *);
1414 num[0] = va_arg(args, int);
1419 str = strerror(errno);
1422 str = ip_ntoa(va_arg(args, u_int32_t));
1425 f = va_arg(args, char *);
1427 * XXX We assume a va_list is either a pointer or an array, so
1428 * what gets passed for a va_list is like a void * in some sense.
1430 a = va_arg(args, void *);
1431 n = vfmtmsg(buf, buflen + 1, f, a);
1438 str += 4; /* chop off the day name */
1439 str[15] = 0; /* chop off year and newline */
1441 case 'v': /* "visible" string */
1442 case 'q': /* quoted string */
1444 p = va_arg(args, unsigned char *);
1445 if (fillch == '0' && prec > 0) {
1448 n = strlen((char *)p);
1449 if (prec > 0 && prec < n)
1452 while (n > 0 && buflen > 0) {
1455 if (!quoted && c >= 0x80) {
1460 if (quoted && (c == '"' || c == '\\'))
1462 if (c < 0x20 || 0x7f <= c && c < 0xa0) {
1466 case '\t': OUTCHAR('t'); break;
1467 case '\n': OUTCHAR('n'); break;
1468 case '\b': OUTCHAR('b'); break;
1469 case '\f': OUTCHAR('f'); break;
1472 OUTCHAR(hexchars[c >> 4]);
1473 OUTCHAR(hexchars[c & 0xf]);
1490 --fmt; /* so %z outputs %z etc. */
1495 str = num + sizeof(num);
1497 while (str > num + neg) {
1498 *--str = hexchars[val % base];
1500 if (--prec <= 0 && val == 0)
1512 len = num + sizeof(num) - 1 - str;
1515 if (prec > 0 && len > prec)
1521 if ((n = width - len) > 0) {
1529 memcpy(buf, str, len);