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 1.33 1996/05/28 00:49:10 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"
56 extern char *strerror();
61 #endif /* IPX_CHANGE */
64 * If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
65 * /etc/ppp/options exists.
67 #ifndef REQ_SYSOPTIONS
68 #define REQ_SYSOPTIONS 1
72 char ifname[IFNAMSIZ]; /* Interface name */
73 int ifunit; /* Interface unit number */
75 char *progname; /* Name of this program */
76 char hostname[MAXNAMELEN]; /* Our hostname */
77 static char pidfilename[MAXPATHLEN]; /* name of pid file */
78 static char default_devnam[MAXPATHLEN]; /* name of default device */
79 static pid_t pid; /* Our pid */
80 static uid_t uid; /* Our real user-id */
82 int ttyfd = -1; /* Serial port file descriptor */
83 mode_t tty_mode = -1; /* Original access permissions to tty */
85 int phase; /* where the link is at */
89 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
90 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
92 int hungup; /* terminal has been hung up */
93 static int n_children; /* # child processes still running */
95 int baud_rate; /* Actual bits/second for serial device */
97 static int locked; /* lock() has succeeded */
99 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
101 /* Prototypes for procedures local to this file. */
103 static void cleanup __P((void));
104 static void close_tty __P((void));
105 static void get_input __P((void));
106 static void connect_time_expired __P((caddr_t));
107 static void calltimeout __P((void));
108 static struct timeval *timeleft __P((struct timeval *));
109 static void hup __P((int));
110 static void term __P((int));
111 static void chld __P((int));
112 static void toggle_debug __P((int));
113 static void open_ccp __P((int));
114 static void bad_signal __P((int));
115 static void holdoff_end __P((void *));
116 static int device_script __P((char *, int, int));
117 static void reap_kids __P((void));
118 static void pr_log __P((void *, char *, ...));
120 extern char *ttyname __P((int));
121 extern char *getlogin __P((void));
125 #define O_NONBLOCK O_NDELAY
128 #ifdef PRIMITIVE_SYSLOG
129 #define setlogmask(x)
133 * PPP Data Link Layer "protocol" table.
134 * One entry per supported protocol.
135 * The last entry must be NULL.
137 struct protent *protocols[] = {
154 int i, nonblock, fdflags;
161 struct protent *protp;
164 phase = PHASE_INITIALIZE;
168 strcpy(default_devnam, devnam);
170 /* Initialize syslog facilities */
171 #ifdef PRIMITIVE_SYSLOG
172 openlog("pppd", LOG_PID);
174 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
175 setlogmask(LOG_UPTO(LOG_INFO));
178 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
179 syslog(LOG_ERR, "couldn't get hostname: %m");
182 hostname[MAXNAMELEN-1] = 0;
187 * Initialize to the standard option set, then parse, in order,
188 * the system options file, the user's options file, and the command
191 for (i = 0; (protp = protocols[i]) != NULL; ++i)
196 if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
197 !options_for_tty() ||
198 !options_from_user() ||
199 !parse_args(argc-1, argv+1))
202 if (!ppp_available()) {
203 fprintf(stderr, no_ppp_msg);
208 * Check that the options given are valid and consistent.
211 auth_check_options();
212 for (i = 0; (protp = protocols[i]) != NULL; ++i)
213 if (protp->check_options != NULL)
214 (*protp->check_options)();
215 if (demand && connector == 0) {
216 fprintf(stderr, "%s: connect script required for demand-dialling\n",
222 * If the user has specified the default device name explicitly,
223 * pretend they hadn't.
225 if (!default_device && strcmp(devnam, default_devnam) == 0)
229 * Initialize system-dependent stuff and magic number package.
234 setlogmask(LOG_UPTO(LOG_DEBUG));
237 * Detach ourselves from the terminal, if required,
238 * and identify who is running us.
240 if (!default_device && !nodetach && daemon(0, 0) < 0) {
241 perror("Couldn't detach from controlling terminal");
248 if (pw != NULL && pw->pw_name != NULL)
253 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
254 VERSION, PATCHLEVEL, p, uid);
257 * Compute mask of all interesting signals and install signal handlers
258 * for each. Only one signal handler may be active at a time. Therefore,
259 * all other signals should be masked when any handler is executing.
262 sigaddset(&mask, SIGHUP);
263 sigaddset(&mask, SIGINT);
264 sigaddset(&mask, SIGTERM);
265 sigaddset(&mask, SIGCHLD);
267 #define SIGNAL(s, handler) { \
268 sa.sa_handler = handler; \
269 if (sigaction(s, &sa, NULL) < 0) { \
270 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
277 SIGNAL(SIGHUP, hup); /* Hangup */
278 SIGNAL(SIGINT, term); /* Interrupt */
279 SIGNAL(SIGTERM, term); /* Terminate */
280 SIGNAL(SIGCHLD, chld);
282 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
283 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
286 * Install a handler for other signals which would otherwise
287 * cause pppd to exit without cleaning up.
289 SIGNAL(SIGABRT, bad_signal);
290 SIGNAL(SIGALRM, bad_signal);
291 SIGNAL(SIGFPE, bad_signal);
292 SIGNAL(SIGILL, bad_signal);
293 SIGNAL(SIGPIPE, bad_signal);
294 SIGNAL(SIGQUIT, bad_signal);
295 SIGNAL(SIGSEGV, bad_signal);
297 SIGNAL(SIGBUS, bad_signal);
300 SIGNAL(SIGEMT, bad_signal);
303 SIGNAL(SIGPOLL, bad_signal);
306 SIGNAL(SIGPROF, bad_signal);
309 SIGNAL(SIGSYS, bad_signal);
312 SIGNAL(SIGTRAP, bad_signal);
315 SIGNAL(SIGVTALRM, bad_signal);
318 SIGNAL(SIGXCPU, bad_signal);
321 SIGNAL(SIGXFSZ, bad_signal);
325 * Apparently we can get a SIGPIPE when we call syslog, if
326 * syslogd has died and been restarted. Ignoring it seems
329 signal(SIGPIPE, SIG_IGN);
332 * If we're doing dial-on-demand, set up the interface now.
336 * Open the loopback channel and set it up to be the ppp interface.
340 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
341 (void) sprintf(ifname, "ppp%d", ifunit);
343 /* write pid to file */
344 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
345 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
346 fprintf(pidfile, "%d\n", pid);
347 (void) fclose(pidfile);
349 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
354 * Configure the interface and mark it up, etc.
363 * Don't do anything until we see some activity.
365 phase = PHASE_DORMANT;
369 wait_loop_output(timeleft(&timo));
376 if (get_loop_output())
382 * Now we want to bring up the link.
385 syslog(LOG_INFO, "Starting link");
389 * Lock the device if we've been asked to.
391 if (lockflag && !default_device) {
392 if (lock(devnam) < 0)
398 * Open the serial device and set it up to be the ppp interface.
399 * If we're dialling out, or we don't want to use the modem lines,
400 * we open it in non-blocking mode, but then we need to clear
401 * the non-blocking I/O bit.
403 nonblock = (connector || !modem)? O_NONBLOCK: 0;
404 if ((ttyfd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
405 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
409 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
410 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
412 "Couldn't reset non-blocking mode on device: %m");
418 * Do the equivalent of `mesg n' to stop broadcast messages.
420 if (fstat(ttyfd, &statbuf) < 0
421 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
423 "Couldn't restrict write permissions to %s: %m", devnam);
425 tty_mode = statbuf.st_mode;
427 /* run connection script */
428 if (connector && connector[0]) {
429 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
431 /* set line speed, flow control, etc.; set CLOCAL for now */
432 set_up_tty(ttyfd, 1);
434 /* drop dtr to hang up in case modem is off hook */
435 if (!default_device && modem) {
436 setdtr(ttyfd, FALSE);
441 if (device_script(connector, ttyfd, ttyfd) < 0) {
442 syslog(LOG_ERR, "Connect script failed");
443 setdtr(ttyfd, FALSE);
447 syslog(LOG_INFO, "Serial connection established.");
448 sleep(1); /* give it time to set up its terminal */
451 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
452 set_up_tty(ttyfd, 0);
454 /* run welcome script, if any */
455 if (welcomer && welcomer[0]) {
456 if (device_script(welcomer, ttyfd, ttyfd) < 0)
457 syslog(LOG_WARNING, "Welcome script failed");
460 /* set up the serial device as a ppp interface */
461 establish_ppp(ttyfd);
465 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
466 (void) sprintf(ifname, "ppp%d", ifunit);
468 /* write pid to file */
469 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
470 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
471 fprintf(pidfile, "%d\n", pid);
472 (void) fclose(pidfile);
474 syslog(LOG_ERR, "Failed to create pid file %s: %m",
481 * Set a timeout to close the connection once the maximum
482 * connect time has expired.
485 TIMEOUT(connect_time_expired, 0, maxconnect);
488 * Start opening the connection and wait for
489 * incoming events (reply, timeout, etc.).
491 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
493 lcp_open(0); /* Start protocol */
494 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
495 wait_input(timeleft(&timo));
499 lcp_close(0, "User request");
500 phase = PHASE_TERMINATE;
504 if (phase == PHASE_NETWORK) {
505 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
510 reap_kids(); /* Don't leave dead kids lying around */
514 * If we may want to bring the link up again, transfer
515 * the ppp unit back to the loopback. Set the
516 * real serial device back to its normal mode of operation.
521 disestablish_ppp(ttyfd);
524 * Run disconnector script, if requested.
525 * XXX we may not be able to do this if the line has hung up!
527 if (disconnector && !hungup) {
528 set_up_tty(ttyfd, 1);
529 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
530 syslog(LOG_WARNING, "disconnect script failed");
532 syslog(LOG_INFO, "Serial link disconnected.");
544 if (unlink(pidfilename) < 0 && errno != ENOENT)
545 syslog(LOG_WARNING, "unable to delete pid file: %m");
555 phase = PHASE_HOLDOFF;
556 TIMEOUT(holdoff_end, NULL, holdoff);
558 wait_time(timeleft(&timo));
564 phase = PHASE_DORMANT; /* allow signal to end holdoff */
567 } while (phase == PHASE_HOLDOFF);
575 * holdoff_end - called via a timeout when the holdoff period ends.
581 phase = PHASE_DORMANT;
585 * get_input - called when incoming data is available.
593 struct protent *protp;
595 p = inpacket_buf; /* point to beginning of packet buffer */
597 len = read_packet(inpacket_buf);
602 syslog(LOG_NOTICE, "Modem hangup");
604 lcp_lowerdown(0); /* serial link is no longer available */
609 if (debug /*&& (debugflags & DBG_INPACKET)*/)
610 log_packet(p, len, "rcvd ");
612 if (len < PPP_HDRLEN) {
613 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
617 p += 2; /* Skip address and control */
618 GETSHORT(protocol, p);
622 * Toss all non-LCP packets unless LCP is OPEN.
624 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
626 "io(): Received non-LCP packet when LCP not open."));
631 * Upcall the proper protocol input routine.
633 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
634 if (protp->protocol == protocol && protp->enabled_flag) {
635 (*protp->input)(0, p, len);
638 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
639 && protp->datainput != NULL) {
640 (*protp->datainput)(0, p, len);
646 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
647 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
652 * quit - Clean up state and exit (with an error indication).
661 * die - like quit, except we can specify an exit status.
668 syslog(LOG_INFO, "Exit.");
673 * connect_time_expired - log a message and close the connection.
676 connect_time_expired(arg)
679 syslog(LOG_INFO, "Connect time expired");
681 phase = PHASE_TERMINATE;
682 lcp_close(0, "Connect time expired"); /* Close connection */
686 * cleanup - restore anything which needs to be restored before we exit
697 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
698 syslog(LOG_WARNING, "unable to delete pid file: %m");
706 * close_tty - restore the terminal device and close it.
711 disestablish_ppp(ttyfd);
713 /* drop dtr to hang up */
715 setdtr(ttyfd, FALSE);
717 * This sleep is in case the serial port has CLOCAL set by default,
718 * and consequently will reassert DTR when we close the device.
725 if (tty_mode != (mode_t) -1)
726 chmod(devnam, tty_mode);
734 struct timeval c_time; /* time at which to call routine */
735 caddr_t c_arg; /* argument to routine */
736 void (*c_func)(); /* routine */
737 struct callout *c_next;
740 static struct callout *callout = NULL; /* Callout list */
741 static struct timeval timenow; /* Current time */
744 * timeout - Schedule a timeout.
746 * Note that this timeout takes the number of seconds, NOT hz (as in
750 timeout(func, arg, time)
755 struct callout *newp, *p, **pp;
757 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
758 (long) func, (long) arg, time));
763 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
764 syslog(LOG_ERR, "Out of memory in timeout()!");
769 gettimeofday(&timenow, NULL);
770 newp->c_time.tv_sec = timenow.tv_sec + time;
771 newp->c_time.tv_usec = timenow.tv_usec;
774 * Find correct place and link it in.
776 for (pp = &callout; (p = *pp); pp = &p->c_next)
777 if (newp->c_time.tv_sec < p->c_time.tv_sec
778 || (newp->c_time.tv_sec == p->c_time.tv_sec
779 && newp->c_time.tv_usec < p->c_time.tv_sec))
787 * untimeout - Unschedule a timeout.
794 struct callout **copp, *freep;
796 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
799 * Find first matching timeout and remove it from the list.
801 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
802 if (freep->c_func == func && freep->c_arg == arg) {
803 *copp = freep->c_next;
804 (void) free((char *) freep);
811 * calltimeout - Call any timeout routines which are now due.
818 while (callout != NULL) {
821 if (gettimeofday(&timenow, NULL) < 0) {
822 syslog(LOG_ERR, "Failed to get time of day: %m");
825 if (!(p->c_time.tv_sec < timenow.tv_sec
826 || (p->c_time.tv_sec == timenow.tv_sec
827 && p->c_time.tv_usec <= timenow.tv_usec)))
828 break; /* no, it's not time yet */
831 (*p->c_func)(p->c_arg);
839 * timeleft - return the length of time until the next timeout is due.
841 static struct timeval *
848 gettimeofday(&timenow, NULL);
849 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
850 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
851 if (tvp->tv_usec < 0) {
852 tvp->tv_usec += 1000000;
856 tvp->tv_sec = tvp->tv_usec = 0;
863 * hup - Catch SIGHUP signal.
865 * Indicates that the physical layer has been disconnected.
866 * We don't rely on this indication; if the user has sent this
867 * signal, we just take the link down.
873 syslog(LOG_INFO, "Hangup (SIGHUP)");
879 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
881 * Indicates that we should initiate a graceful disconnect and exit.
888 syslog(LOG_INFO, "Terminating on signal %d.", sig);
889 persist = 0; /* don't try to restart */
895 * chld - Catch SIGCHLD signal.
896 * Calls reap_kids to get status for any dead kids.
907 * toggle_debug - Catch SIGUSR1 signal.
918 setlogmask(LOG_UPTO(LOG_DEBUG));
920 setlogmask(LOG_UPTO(LOG_WARNING));
926 * open_ccp - Catch SIGUSR2 signal.
928 * Try to (re)negotiate compression.
940 * bad_signal - We've caught a fatal signal. Clean up state and exit.
946 syslog(LOG_ERR, "Fatal signal %d", sig);
952 * device_script - run a program to connect or disconnect the
956 device_script(program, in, out)
967 syslog(LOG_ERR, "Failed to create child process: %m");
976 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
981 execl("/bin/sh", "sh", "-c", program, (char *)0);
982 syslog(LOG_ERR, "could not exec /bin/sh: %m");
987 while (waitpid(pid, &status, 0) < 0) {
990 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
994 return (status == 0 ? 0 : -1);
999 * run-program - execute a program with given arguments,
1000 * but don't wait for it.
1001 * If the program can't be executed, logs an error unless
1002 * must_exist is 0 and the program file doesn't exist.
1005 run_program(prog, args, must_exist)
1015 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1021 /* Leave the current location */
1022 (void) setsid(); /* No controlling tty. */
1023 (void) umask (S_IRWXG|S_IRWXO);
1024 (void) chdir ("/"); /* no current directory. */
1028 /* Ensure that nothing of our device environment is inherited. */
1034 close (ttyfd); /* tty interface to the ppp device */
1036 /* Don't pass handles to the PPP device, even by accident. */
1037 new_fd = open (_PATH_DEVNULL, O_RDWR);
1040 dup2 (new_fd, 0); /* stdin <- /dev/null */
1043 dup2 (0, 1); /* stdout -> /dev/null */
1044 dup2 (0, 2); /* stderr -> /dev/null */
1048 /* Force the priority back to zero if pppd is running higher. */
1049 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1050 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1053 /* SysV recommends a second fork at this point. */
1055 /* run the program; give it a null environment */
1057 execve(prog, args, nullenv);
1058 if (must_exist || errno != ENOENT)
1059 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1062 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1069 * reap_kids - get status from any dead child processes,
1070 * and log a message for abnormal terminations.
1077 if (n_children == 0)
1079 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1080 if (errno != ECHILD)
1081 syslog(LOG_ERR, "Error waiting for child process: %m");
1086 if (WIFSIGNALED(status)) {
1087 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1088 pid, WTERMSIG(status));
1095 * log_packet - format a packet and log it.
1098 char line[256]; /* line to be logged accumulated here */
1102 log_packet(p, len, prefix)
1107 strcpy(line, prefix);
1108 linep = line + strlen(line);
1109 format_packet(p, len, pr_log, NULL);
1111 syslog(LOG_DEBUG, "%s", line);
1115 * format_packet - make a readable representation of a packet,
1116 * calling `printer(arg, format, ...)' to output it.
1119 format_packet(p, len, printer, arg)
1122 void (*printer) __P((void *, char *, ...));
1128 struct protent *protp;
1130 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1134 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1135 if (proto == protp->protocol)
1137 if (protp != NULL) {
1138 printer(arg, "[%s", protp->name);
1139 n = (*protp->printpkt)(p, len, printer, arg);
1144 printer(arg, "[proto=0x%x]", proto);
1148 for (; len > 0; --len) {
1150 printer(arg, " %.2x", x);
1156 pr_log(void *arg, char *fmt, ...)
1167 va_start(pvar, fmt);
1172 arg = va_arg(pvar, void *);
1173 fmt = va_arg(pvar, char *);
1176 vsprintf(buf, fmt, pvar);
1180 if (linep + n + 1 > line + sizeof(line)) {
1181 syslog(LOG_DEBUG, "%s", line);
1189 * print_string - print a readable representation of a string using
1193 print_string(p, len, printer, arg)
1196 void (*printer) __P((void *, char *, ...));
1202 for (; len > 0; --len) {
1204 if (' ' <= c && c <= '~')
1205 printer(arg, "%c", c);
1207 printer(arg, "\\%.3o", c);
1213 * novm - log an error message saying we ran out of memory, and die.
1219 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1224 * fmtmsg - format a message into a buffer. Like sprintf except we
1225 * also specify the length of the output buffer, and we handle
1226 * %r (recursive format), %m (error message) and %I (IP address) formats.
1227 * Doesn't do floating-point formats.
1228 * Returns the number of chars put into buf.
1231 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1237 va_start(args, fmt);
1243 buf = va_arg(args, char *);
1244 buflen = va_arg(args, int);
1245 fmt = va_arg(args, char *);
1247 n = vfmtmsg(buf, buflen, fmt, args);
1253 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1256 vfmtmsg(char *buf, int buflen, char *fmt, va_list args)
1262 char *str, *f, *buf0;
1265 static char hexchars[16] = "0123456789abcdef";
1269 while (buflen > 0) {
1270 for (f = fmt; *f != '%' && *f != 0; ++f)
1276 memcpy(buf, fmt, len);
1285 while (isdigit(c)) {
1286 width = width * 10 + c - '0';
1291 while (isdigit(c)) {
1292 prec = prec * 10 + c - '0';
1302 i = va_arg(args, int);
1311 val = va_arg(args, unsigned int);
1315 val = va_arg(args, unsigned int);
1319 val = (unsigned long) va_arg(args, void *);
1324 str = va_arg(args, char *);
1327 num[0] = va_arg(args, int);
1332 str = strerror(errno);
1335 str = ip_ntoa(va_arg(args, u_int32_t));
1338 f = va_arg(args, char *);
1339 a = va_arg(args, va_list);
1340 n = vfmtmsg(buf, buflen + 1, f, a);
1347 --fmt; /* so %z outputs %z etc. */
1352 str = num + sizeof(num);
1354 while (str > num + neg) {
1355 *--str = hexchars[val % base];
1357 if (--prec <= 0 && val == 0)
1369 len = num + sizeof(num) - 1 - str;
1372 if (prec > 0 && len > prec)
1378 if ((n = width - len) > 0) {
1386 memcpy(buf, str, len);