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 1.34 1996/07/01 01:17:39 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 */
84 int baud_rate; /* Actual bits/second for serial device */
85 int hungup; /* terminal has been hung up */
87 int phase; /* where the link is at */
90 int redirect_stderr; /* Connector's stderr should go to file */
92 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
93 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
95 static int n_children; /* # child processes still running */
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,
189 * the tty's options file, and the command line arguments.
191 for (i = 0; (protp = protocols[i]) != NULL; ++i)
196 if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0)
197 || !options_from_user())
199 scan_args(argc-1, argv+1); /* look for tty name on command line */
200 if (!options_for_tty()
201 || !parse_args(argc-1, argv+1))
204 if (!ppp_available()) {
205 fprintf(stderr, no_ppp_msg);
210 * Check that the options given are valid and consistent.
213 auth_check_options();
214 for (i = 0; (protp = protocols[i]) != NULL; ++i)
215 if (protp->check_options != NULL)
216 (*protp->check_options)();
217 if (demand && connector == 0) {
218 fprintf(stderr, "%s: connect script required for demand-dialling\n",
224 * If the user has specified the default device name explicitly,
225 * pretend they hadn't.
227 if (!default_device && strcmp(devnam, default_devnam) == 0)
229 redirect_stderr = !nodetach || default_device;
232 * Initialize system-dependent stuff and magic number package.
237 setlogmask(LOG_UPTO(LOG_DEBUG));
240 * Detach ourselves from the terminal, if required,
241 * and identify who is running us.
243 if (!default_device && !nodetach && daemon(0, 0) < 0) {
244 perror("Couldn't detach from controlling terminal");
251 if (pw != NULL && pw->pw_name != NULL)
256 syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
257 VERSION, PATCHLEVEL, p, uid);
260 * Compute mask of all interesting signals and install signal handlers
261 * for each. Only one signal handler may be active at a time. Therefore,
262 * all other signals should be masked when any handler is executing.
265 sigaddset(&mask, SIGHUP);
266 sigaddset(&mask, SIGINT);
267 sigaddset(&mask, SIGTERM);
268 sigaddset(&mask, SIGCHLD);
270 #define SIGNAL(s, handler) { \
271 sa.sa_handler = handler; \
272 if (sigaction(s, &sa, NULL) < 0) { \
273 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
280 SIGNAL(SIGHUP, hup); /* Hangup */
281 SIGNAL(SIGINT, term); /* Interrupt */
282 SIGNAL(SIGTERM, term); /* Terminate */
283 SIGNAL(SIGCHLD, chld);
285 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
286 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
289 * Install a handler for other signals which would otherwise
290 * cause pppd to exit without cleaning up.
292 SIGNAL(SIGABRT, bad_signal);
293 SIGNAL(SIGALRM, bad_signal);
294 SIGNAL(SIGFPE, bad_signal);
295 SIGNAL(SIGILL, bad_signal);
296 SIGNAL(SIGPIPE, bad_signal);
297 SIGNAL(SIGQUIT, bad_signal);
298 SIGNAL(SIGSEGV, bad_signal);
300 SIGNAL(SIGBUS, bad_signal);
303 SIGNAL(SIGEMT, bad_signal);
306 SIGNAL(SIGPOLL, bad_signal);
309 SIGNAL(SIGPROF, bad_signal);
312 SIGNAL(SIGSYS, bad_signal);
315 SIGNAL(SIGTRAP, bad_signal);
318 SIGNAL(SIGVTALRM, bad_signal);
321 SIGNAL(SIGXCPU, bad_signal);
324 SIGNAL(SIGXFSZ, bad_signal);
328 * Apparently we can get a SIGPIPE when we call syslog, if
329 * syslogd has died and been restarted. Ignoring it seems
332 signal(SIGPIPE, SIG_IGN);
335 * If we're doing dial-on-demand, set up the interface now.
339 * Open the loopback channel and set it up to be the ppp interface.
343 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
344 (void) sprintf(ifname, "ppp%d", ifunit);
346 /* write pid to file */
347 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
348 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
349 fprintf(pidfile, "%d\n", pid);
350 (void) fclose(pidfile);
352 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
357 * Configure the interface and mark it up, etc.
366 * Don't do anything until we see some activity.
368 phase = PHASE_DORMANT;
372 wait_loop_output(timeleft(&timo));
379 if (get_loop_output())
385 * Now we want to bring up the link.
388 syslog(LOG_INFO, "Starting link");
392 * Lock the device if we've been asked to.
394 if (lockflag && !default_device) {
395 if (lock(devnam) < 0)
401 * Open the serial device and set it up to be the ppp interface.
402 * If we're dialling out, or we don't want to use the modem lines,
403 * we open it in non-blocking mode, but then we need to clear
404 * the non-blocking I/O bit.
406 nonblock = (connector || !modem)? O_NONBLOCK: 0;
407 if ((ttyfd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
408 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
412 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
413 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
415 "Couldn't reset non-blocking mode on device: %m");
421 * Do the equivalent of `mesg n' to stop broadcast messages.
423 if (fstat(ttyfd, &statbuf) < 0
424 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
426 "Couldn't restrict write permissions to %s: %m", devnam);
428 tty_mode = statbuf.st_mode;
430 /* run connection script */
431 if (connector && connector[0]) {
432 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
434 /* set line speed, flow control, etc.; set CLOCAL for now */
435 set_up_tty(ttyfd, 1);
437 /* drop dtr to hang up in case modem is off hook */
438 if (!default_device && modem) {
439 setdtr(ttyfd, FALSE);
444 if (device_script(connector, ttyfd, ttyfd) < 0) {
445 syslog(LOG_ERR, "Connect script failed");
446 setdtr(ttyfd, FALSE);
450 syslog(LOG_INFO, "Serial connection established.");
451 sleep(1); /* give it time to set up its terminal */
454 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
455 set_up_tty(ttyfd, 0);
457 /* run welcome script, if any */
458 if (welcomer && welcomer[0]) {
459 if (device_script(welcomer, ttyfd, ttyfd) < 0)
460 syslog(LOG_WARNING, "Welcome script failed");
463 /* set up the serial device as a ppp interface */
464 establish_ppp(ttyfd);
468 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
469 (void) sprintf(ifname, "ppp%d", ifunit);
471 /* write pid to file */
472 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
473 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
474 fprintf(pidfile, "%d\n", pid);
475 (void) fclose(pidfile);
477 syslog(LOG_ERR, "Failed to create pid file %s: %m",
484 * Set a timeout to close the connection once the maximum
485 * connect time has expired.
488 TIMEOUT(connect_time_expired, 0, maxconnect);
491 * Start opening the connection and wait for
492 * incoming events (reply, timeout, etc.).
494 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
496 lcp_open(0); /* Start protocol */
497 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
498 wait_input(timeleft(&timo));
502 lcp_close(0, "User request");
506 if (phase == PHASE_NETWORK) {
507 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
508 (*ccp_protent.open)(0);
512 reap_kids(); /* Don't leave dead kids lying around */
516 * If we may want to bring the link up again, transfer
517 * the ppp unit back to the loopback. Set the
518 * real serial device back to its normal mode of operation.
522 disestablish_ppp(ttyfd);
527 disestablish_ppp(ttyfd);
531 * Run disconnector script, if requested.
532 * XXX we may not be able to do this if the line has hung up!
534 if (disconnector && !hungup) {
535 set_up_tty(ttyfd, 1);
536 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
537 syslog(LOG_WARNING, "disconnect script failed");
539 syslog(LOG_INFO, "Serial link disconnected.");
551 if (pidfilename[0] != 0
552 && unlink(pidfilename) < 0 && errno != ENOENT)
553 syslog(LOG_WARNING, "unable to delete pid file: %m");
563 phase = PHASE_HOLDOFF;
564 TIMEOUT(holdoff_end, NULL, holdoff);
566 wait_time(timeleft(&timo));
572 phase = PHASE_DORMANT; /* allow signal to end holdoff */
575 } while (phase == PHASE_HOLDOFF);
583 * holdoff_end - called via a timeout when the holdoff period ends.
589 phase = PHASE_DORMANT;
593 * get_input - called when incoming data is available.
601 struct protent *protp;
603 p = inpacket_buf; /* point to beginning of packet buffer */
605 len = read_packet(inpacket_buf);
610 syslog(LOG_NOTICE, "Modem hangup");
612 lcp_lowerdown(0); /* serial link is no longer available */
617 if (debug /*&& (debugflags & DBG_INPACKET)*/)
618 log_packet(p, len, "rcvd ");
620 if (len < PPP_HDRLEN) {
621 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
625 p += 2; /* Skip address and control */
626 GETSHORT(protocol, p);
630 * Toss all non-LCP packets unless LCP is OPEN.
632 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
634 "io(): Received non-LCP packet when LCP not open."));
639 * Upcall the proper protocol input routine.
641 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
642 if (protp->protocol == protocol && protp->enabled_flag) {
643 (*protp->input)(0, p, len);
646 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
647 && protp->datainput != NULL) {
648 (*protp->datainput)(0, p, len);
654 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
655 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
660 * quit - Clean up state and exit (with an error indication).
669 * die - like quit, except we can specify an exit status.
676 syslog(LOG_INFO, "Exit.");
681 * connect_time_expired - log a message and close the connection.
684 connect_time_expired(arg)
687 syslog(LOG_INFO, "Connect time expired");
688 lcp_close(0, "Connect time expired"); /* Close connection */
692 * cleanup - restore anything which needs to be restored before we exit
703 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
704 syslog(LOG_WARNING, "unable to delete pid file: %m");
712 * close_tty - restore the terminal device and close it.
717 disestablish_ppp(ttyfd);
719 /* drop dtr to hang up */
721 setdtr(ttyfd, FALSE);
723 * This sleep is in case the serial port has CLOCAL set by default,
724 * and consequently will reassert DTR when we close the device.
731 if (tty_mode != (mode_t) -1)
732 chmod(devnam, tty_mode);
740 struct timeval c_time; /* time at which to call routine */
741 caddr_t c_arg; /* argument to routine */
742 void (*c_func)(); /* routine */
743 struct callout *c_next;
746 static struct callout *callout = NULL; /* Callout list */
747 static struct timeval timenow; /* Current time */
750 * timeout - Schedule a timeout.
752 * Note that this timeout takes the number of seconds, NOT hz (as in
756 timeout(func, arg, time)
761 struct callout *newp, *p, **pp;
763 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
764 (long) func, (long) arg, time));
769 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
770 syslog(LOG_ERR, "Out of memory in timeout()!");
775 gettimeofday(&timenow, NULL);
776 newp->c_time.tv_sec = timenow.tv_sec + time;
777 newp->c_time.tv_usec = timenow.tv_usec;
780 * Find correct place and link it in.
782 for (pp = &callout; (p = *pp); pp = &p->c_next)
783 if (newp->c_time.tv_sec < p->c_time.tv_sec
784 || (newp->c_time.tv_sec == p->c_time.tv_sec
785 && newp->c_time.tv_usec < p->c_time.tv_sec))
793 * untimeout - Unschedule a timeout.
800 struct callout **copp, *freep;
802 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
805 * Find first matching timeout and remove it from the list.
807 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
808 if (freep->c_func == func && freep->c_arg == arg) {
809 *copp = freep->c_next;
810 (void) free((char *) freep);
817 * calltimeout - Call any timeout routines which are now due.
824 while (callout != NULL) {
827 if (gettimeofday(&timenow, NULL) < 0) {
828 syslog(LOG_ERR, "Failed to get time of day: %m");
831 if (!(p->c_time.tv_sec < timenow.tv_sec
832 || (p->c_time.tv_sec == timenow.tv_sec
833 && p->c_time.tv_usec <= timenow.tv_usec)))
834 break; /* no, it's not time yet */
837 (*p->c_func)(p->c_arg);
845 * timeleft - return the length of time until the next timeout is due.
847 static struct timeval *
854 gettimeofday(&timenow, NULL);
855 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
856 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
857 if (tvp->tv_usec < 0) {
858 tvp->tv_usec += 1000000;
862 tvp->tv_sec = tvp->tv_usec = 0;
869 * hup - Catch SIGHUP signal.
871 * Indicates that the physical layer has been disconnected.
872 * We don't rely on this indication; if the user has sent this
873 * signal, we just take the link down.
879 syslog(LOG_INFO, "Hangup (SIGHUP)");
885 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
887 * Indicates that we should initiate a graceful disconnect and exit.
894 syslog(LOG_INFO, "Terminating on signal %d.", sig);
895 persist = 0; /* don't try to restart */
901 * chld - Catch SIGCHLD signal.
902 * Calls reap_kids to get status for any dead kids.
913 * toggle_debug - Catch SIGUSR1 signal.
924 setlogmask(LOG_UPTO(LOG_DEBUG));
926 setlogmask(LOG_UPTO(LOG_WARNING));
932 * open_ccp - Catch SIGUSR2 signal.
934 * Try to (re)negotiate compression.
946 * bad_signal - We've caught a fatal signal. Clean up state and exit.
952 syslog(LOG_ERR, "Fatal signal %d", sig);
958 * device_script - run a program to connect or disconnect the
962 device_script(program, in, out)
973 syslog(LOG_ERR, "Failed to create child process: %m");
998 if (redirect_stderr) {
1000 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1001 if (errfd >= 0 && errfd != 2) {
1008 execl("/bin/sh", "sh", "-c", program, (char *)0);
1009 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1014 while (waitpid(pid, &status, 0) < 0) {
1017 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1021 return (status == 0 ? 0 : -1);
1026 * run-program - execute a program with given arguments,
1027 * but don't wait for it.
1028 * If the program can't be executed, logs an error unless
1029 * must_exist is 0 and the program file doesn't exist.
1032 run_program(prog, args, must_exist)
1042 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1048 /* Leave the current location */
1049 (void) setsid(); /* No controlling tty. */
1050 (void) umask (S_IRWXG|S_IRWXO);
1051 (void) chdir ("/"); /* no current directory. */
1055 /* Ensure that nothing of our device environment is inherited. */
1061 close (ttyfd); /* tty interface to the ppp device */
1063 /* Don't pass handles to the PPP device, even by accident. */
1064 new_fd = open (_PATH_DEVNULL, O_RDWR);
1067 dup2 (new_fd, 0); /* stdin <- /dev/null */
1070 dup2 (0, 1); /* stdout -> /dev/null */
1071 dup2 (0, 2); /* stderr -> /dev/null */
1075 /* Force the priority back to zero if pppd is running higher. */
1076 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1077 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1080 /* SysV recommends a second fork at this point. */
1082 /* run the program; give it a null environment */
1084 execve(prog, args, nullenv);
1085 if (must_exist || errno != ENOENT)
1086 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1089 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1096 * reap_kids - get status from any dead child processes,
1097 * and log a message for abnormal terminations.
1104 if (n_children == 0)
1106 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1107 if (errno != ECHILD)
1108 syslog(LOG_ERR, "Error waiting for child process: %m");
1113 if (WIFSIGNALED(status)) {
1114 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1115 pid, WTERMSIG(status));
1122 * log_packet - format a packet and log it.
1125 char line[256]; /* line to be logged accumulated here */
1129 log_packet(p, len, prefix)
1134 strcpy(line, prefix);
1135 linep = line + strlen(line);
1136 format_packet(p, len, pr_log, NULL);
1138 syslog(LOG_DEBUG, "%s", line);
1142 * format_packet - make a readable representation of a packet,
1143 * calling `printer(arg, format, ...)' to output it.
1146 format_packet(p, len, printer, arg)
1149 void (*printer) __P((void *, char *, ...));
1155 struct protent *protp;
1157 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1161 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1162 if (proto == protp->protocol)
1164 if (protp != NULL) {
1165 printer(arg, "[%s", protp->name);
1166 n = (*protp->printpkt)(p, len, printer, arg);
1171 printer(arg, "[proto=0x%x]", proto);
1175 for (; len > 0; --len) {
1177 printer(arg, " %.2x", x);
1182 pr_log __V((void *arg, char *fmt, ...))
1189 va_start(pvar, fmt);
1194 arg = va_arg(pvar, void *);
1195 fmt = va_arg(pvar, char *);
1198 vsprintf(buf, fmt, pvar);
1202 if (linep + n + 1 > line + sizeof(line)) {
1203 syslog(LOG_DEBUG, "%s", line);
1211 * print_string - print a readable representation of a string using
1215 print_string(p, len, printer, arg)
1218 void (*printer) __P((void *, char *, ...));
1224 for (; len > 0; --len) {
1226 if (' ' <= c && c <= '~') {
1227 if (c == '\\' || c == '"')
1229 printer(arg, "%c", c);
1233 printer(arg, "\\n");
1236 printer(arg, "\\r");
1239 printer(arg, "\\t");
1242 printer(arg, "\\%.3o", c);
1250 * novm - log an error message saying we ran out of memory, and die.
1256 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1261 * fmtmsg - format a message into a buffer. Like sprintf except we
1262 * also specify the length of the output buffer, and we handle
1263 * %r (recursive format), %m (error message) and %I (IP address) formats.
1264 * Doesn't do floating-point formats.
1265 * Returns the number of chars put into buf.
1268 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1274 va_start(args, fmt);
1280 buf = va_arg(args, char *);
1281 buflen = va_arg(args, int);
1282 fmt = va_arg(args, char *);
1284 n = vfmtmsg(buf, buflen, fmt, args);
1290 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1292 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1295 vfmtmsg(char *buf, int buflen, char *fmt, va_list args)
1298 int width, prec, fillch;
1299 int base, len, neg, quoted;
1301 char *str, *f, *buf0;
1306 static char hexchars[16] = "0123456789abcdef";
1310 while (buflen > 0) {
1311 for (f = fmt; *f != '%' && *f != 0; ++f)
1317 memcpy(buf, fmt, len);
1332 width = va_arg(args, int);
1335 while (isdigit(c)) {
1336 width = width * 10 + c - '0';
1343 prec = va_arg(args, int);
1346 while (isdigit(c)) {
1347 prec = prec * 10 + c - '0';
1358 i = va_arg(args, int);
1367 val = va_arg(args, unsigned int);
1371 val = va_arg(args, unsigned int);
1375 val = (unsigned long) va_arg(args, void *);
1380 str = va_arg(args, char *);
1383 num[0] = va_arg(args, int);
1388 str = strerror(errno);
1391 str = ip_ntoa(va_arg(args, u_int32_t));
1394 f = va_arg(args, char *);
1395 a = va_arg(args, va_list);
1396 n = vfmtmsg(buf, buflen + 1, f, a);
1403 str += 4; /* chop off the day name */
1404 str[15] = 0; /* chop off year and newline */
1406 case 'v': /* "visible" string */
1407 case 'q': /* quoted string */
1409 p = va_arg(args, unsigned char *);
1410 if (fillch == '0' && prec > 0) {
1413 n = strlen((char *)p);
1414 if (prec > 0 && prec < n)
1417 while (n > 0 && buflen > 0) {
1420 if (!quoted && c >= 0x80) {
1425 if (quoted && (c == '"' || c == '\\'))
1427 if (c < 0x20 || 0x7f <= c && c < 0xa0) {
1431 case '\t': OUTCHAR('t'); break;
1432 case '\n': OUTCHAR('n'); break;
1433 case '\b': OUTCHAR('b'); break;
1434 case '\f': OUTCHAR('f'); break;
1437 OUTCHAR(hexchars[c >> 4]);
1438 OUTCHAR(hexchars[c & 0xf]);
1455 --fmt; /* so %z outputs %z etc. */
1460 str = num + sizeof(num);
1462 while (str > num + neg) {
1463 *--str = hexchars[val % base];
1465 if (--prec <= 0 && val == 0)
1477 len = num + sizeof(num) - 1 - str;
1480 if (prec > 0 && len > prec)
1486 if ((n = width - len) > 0) {
1494 memcpy(buf, str, len);