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comparison usr/src/cmd/cmd-inet/usr.bin/pppd/main.c @ 0:c9caec207d52 b86

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Initial porting based on b86
author Koji Uno <koji.uno@sun.com>
date Tue, 02 Jun 2009 18:56:50 +0900
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children 1a15d5aaf794
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-1:000000000000 0:c9caec207d52
1 /*
2 * main.c - Point-to-Point Protocol main module
3 *
4 * Copyright 2000-2002 Sun Microsystems, Inc. All rights reserved.
5 * Use is subject to license terms.
6 *
7 * Permission to use, copy, modify, and distribute this software and its
8 * documentation is hereby granted, provided that the above copyright
9 * notice appears in all copies.
10 *
11 * SUN MAKES NO REPRESENTATION OR WARRANTIES ABOUT THE SUITABILITY OF
12 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
13 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
14 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
15 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
16 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES
17 *
18 * Copyright (c) 1989 Carnegie Mellon University.
19 * All rights reserved.
20 *
21 * Redistribution and use in source and binary forms are permitted
22 * provided that the above copyright notice and this paragraph are
23 * duplicated in all such forms and that any documentation,
24 * advertising materials, and other materials related to such
25 * distribution and use acknowledge that the software was developed
26 * by Carnegie Mellon University. The name of the
27 * University may not be used to endorse or promote products derived
28 * from this software without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
31 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
32 */
33
34 #pragma ident "@(#)main.c 1.8 02/06/20 SMI"
35 #define RCSID "$Id: main.c,v 1.97 2000/04/24 02:54:16 masputra Exp $"
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include <signal.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <syslog.h>
45 #include <netdb.h>
46 #include <pwd.h>
47 #include <setjmp.h>
48 #include <sys/param.h>
49 #include <sys/types.h>
50 #include <sys/wait.h>
51 #include <sys/time.h>
52 #include <sys/resource.h>
53 #include <sys/stat.h>
54 #include <sys/socket.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57
58 #include "pppd.h"
59 #include "magic.h"
60 #include "fsm.h"
61 #include "lcp.h"
62 #include "ipcp.h"
63 #ifdef INET6
64 #include "ipv6cp.h"
65 #endif
66 #include "upap.h"
67 #include "chap.h"
68 #include "ccp.h"
69 #include "pathnames.h"
70 #include "patchlevel.h"
71
72 #ifdef HAVE_MULTILINK
73 #include "tdb.h"
74 #endif
75
76 #ifdef CBCP_SUPPORT
77 #include "cbcp.h"
78 #endif
79
80 #ifdef IPX_CHANGE
81 #include "ipxcp.h"
82 #endif /* IPX_CHANGE */
83 #ifdef AT_CHANGE
84 #include "atcp.h"
85 #endif
86
87 #if !defined(lint) && !defined(_lint)
88 static const char rcsid[] = RCSID;
89 #endif
90
91 /* interface vars */
92 char ifname[32]; /* Interface name */
93 int ifunit = -1; /* Interface unit number */
94
95 char *progname; /* Name of this program */
96 char hostname[MAXHOSTNAMELEN+1]; /* Our hostname */
97 static char pidfilename[MAXPATHLEN]; /* name of pid file */
98 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
99 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
100 static uid_t uid; /* Our real user-id */
101 static int conn_running; /* we have a [dis]connector running */
102
103 int ttyfd; /* Serial port file descriptor */
104 mode_t tty_mode = (mode_t)-1; /* Original access permissions to tty */
105 int baud_rate; /* Actual bits/second for serial device */
106 bool hungup; /* terminal has been hung up */
107 bool privileged; /* we're running as real uid root */
108 bool need_holdoff; /* need holdoff period before restarting */
109 bool detached; /* have detached from terminal */
110 struct stat devstat; /* result of stat() on devnam */
111 bool prepass = 0; /* doing prepass to find device name */
112 int devnam_fixed; /* set while in options.ttyxx file */
113 volatile int status; /* exit status for pppd */
114 int unsuccess; /* # unsuccessful connection attempts */
115 int do_callback; /* != 0 if we should do callback next */
116 int doing_callback; /* != 0 if we are doing callback */
117 char *callback_script; /* script for doing callback */
118 #ifdef HAVE_MULTILINK
119 TDB_CONTEXT *pppdb; /* database for storing status etc. */
120 char db_key[32];
121 #endif
122
123 /*
124 * For plug-in usage:
125 *
126 * holdoff_hook - Can be used to change the demand-dial hold-off
127 * time dynamically. This is normally set by the
128 * "holdoff" option, and is 30 seconds by default.
129 *
130 * new_phase_hook - This is called for each change in the PPP
131 * phase (per RFC 1661). This can be used to log
132 * progress.
133 *
134 * check_options_hook - This is called before doing sys_init()
135 * and allows the plugin to verify the selected options.
136 *
137 * updown_script_hook - This is called with the proposed
138 * command-line arguments for any of the
139 * /etc/ppp/{ip,ipv6,ipx,auth}-{up,down} scripts before
140 * fork/exec. It can be used to add or change arguments.
141 *
142 * device_pipe_hook - If this is set, then an extra fd (3) is
143 * passed to the connect/disconnect script. This extra
144 * fd is the write side of a pipe, and the read side is
145 * passed to this routine. This can be used to pass
146 * arbitrary data from the script back to pppd.
147 */
148 int (*holdoff_hook) __P((void)) = NULL;
149 int (*new_phase_hook) __P((int new, int old)) = NULL;
150 int (*check_options_hook) __P((uid_t uid)) = NULL;
151 int (*updown_script_hook) __P((const char ***argsp)) = NULL;
152 void (*device_pipe_hook) __P((int pipefd)) = NULL;
153
154 static int fd_ppp = -1; /* fd for talking PPP */
155 static int fd_loop; /* fd for getting demand-dial packets */
156 static int pty_master; /* fd for master side of pty */
157 int pty_slave = -1; /* fd for slave side of pty */
158 static int real_ttyfd; /* fd for actual serial port (not pty) */
159
160 int phase; /* where the link is at */
161 int kill_link;
162 int open_ccp_flag;
163
164 static int waiting; /* for input from peer or timer expiration */
165 static sigjmp_buf sigjmp;
166
167 char **script_env; /* Env. variable values for scripts */
168 int s_env_nalloc; /* # words avail at script_env */
169
170 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
171 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
172 u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
173
174 static int n_children; /* # child processes still running */
175 static bool got_sigchld; /* set if we have received a SIGCHLD */
176 static sigset_t main_sigmask; /* signals blocked while dispatching */
177
178 static bool locked; /* lock() has succeeded */
179 static bool privopen; /* don't lock, open device as root */
180
181 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
182
183 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
184 int ngroups; /* How many groups valid in groups */
185
186 static struct timeval start_time; /* Time when link was started. */
187
188 struct pppd_stats link_stats;
189 int link_connect_time;
190 bool link_stats_valid;
191
192 static pid_t charshunt_pid; /* Process ID for charshunt */
193
194 extern option_t general_options[];
195 extern option_t auth_options[];
196
197 /*
198 * We maintain a list of child process pids and
199 * functions to call when they exit.
200 */
201 struct subprocess {
202 pid_t pid;
203 char *prog;
204 void (*done) __P((void *, int));
205 void *arg;
206 struct subprocess *next;
207 };
208
209 static struct subprocess *children;
210
211 /* Prototypes for procedures local to this file. */
212
213 static void setup_signals __P((void));
214 static void create_pidfile __P((void));
215 static void create_linkpidfile __P((void));
216 static void cleanup __P((void));
217 static void close_tty __P((void));
218 static void get_input __P((void));
219 static void calltimeout __P((void));
220 static struct timeval *timeleft __P((struct timeval *));
221 static void kill_my_pg __P((int));
222 static void hup __P((int));
223 static void term __P((int));
224 static void chld __P((int));
225 static void toggle_debug __P((int));
226 static void open_ccp __P((int));
227 static void bad_signal __P((int));
228 static void holdoff_end __P((void *));
229 static int device_script __P((char *, int, int, int, char *));
230 static int reap_kids __P((int waitfor));
231 static void record_child __P((pid_t, char *, void (*) (void *, int), void *));
232 static int open_socket __P((char *));
233 static int start_charshunt __P((int, int));
234 static void charshunt_done __P((void *, int));
235 static void charshunt __P((int, int, char *));
236 static int record_write __P((FILE *, int code, u_char *buf, int nb,
237 struct timeval *));
238 static void final_reap __P((void));
239
240 #ifdef HAVE_MULTILINK
241 static void update_db_entry __P((void));
242 static void add_db_key __P((const char *));
243 static void delete_db_key __P((const char *));
244 static void cleanup_db __P((void));
245 #endif
246
247 int main __P((int, char *[]));
248
249 #ifdef ultrix
250 #undef O_NONBLOCK
251 #define O_NONBLOCK O_NDELAY
252 #endif
253
254 #ifdef ULTRIX
255 #define setlogmask(x) 0
256 #endif
257
258 /* Backward compatibility for Linux */
259 #ifndef RECMARK_TIMESTART
260 #define RECMARK_STARTSEND 1
261 #define RECMARK_STARTRECV 2
262 #define RECMARK_ENDSEND 3
263 #define RECMARK_ENDRECV 4
264 #define RECMARK_TIMEDELTA32 5
265 #define RECMARK_TIMEDELTA8 6
266 #define RECMARK_TIMESTART 7
267 #endif
268
269 /*
270 * PPP Data Link Layer "protocol" table.
271 * One entry per supported protocol.
272 * The last entry must be NULL.
273 */
274 struct protent *protocols[] = {
275 &lcp_protent,
276 &pap_protent,
277 &chap_protent,
278 #ifdef CBCP_SUPPORT
279 &cbcp_protent,
280 #endif
281 &ipcp_protent,
282 #ifdef INET6
283 &ipv6cp_protent,
284 #endif
285 &ccp_protent,
286 #ifdef IPX_CHANGE
287 &ipxcp_protent,
288 #endif
289 #ifdef AT_CHANGE
290 &atcp_protent,
291 #endif
292 NULL
293 };
294
295 int
296 main(argc, argv)
297 int argc;
298 char *argv[];
299 {
300 int i, fdflags, t;
301 char *p, *connector;
302 struct passwd *pw;
303 struct timeval timo;
304 struct protent *protp;
305 struct stat statbuf;
306 char numbuf[16];
307
308 ifname[0] = '\0';
309 new_phase(PHASE_INITIALIZE);
310
311 /*
312 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
313 * This way we can close 0, 1, 2 in detach() without clobbering
314 * a fd that we are using.
315 */
316 if ((i = open(_PATH_DEVNULL, O_RDWR)) >= 0) {
317 while (0 <= i && i <= 2)
318 i = dup(i);
319 if (i >= 0)
320 (void) close(i);
321 }
322
323 script_env = NULL;
324
325 /* Initialize syslog facilities */
326 reopen_log();
327
328 if (gethostname(hostname, MAXHOSTNAMELEN+1) < 0 ) {
329 option_error("Couldn't get hostname: %m");
330 exit(1);
331 }
332 hostname[MAXHOSTNAMELEN] = '\0';
333
334 /* make sure we don't create world or group writable files. */
335 (void) umask(umask(0777) | 022);
336
337 uid = getuid();
338 privileged = (uid == 0);
339 (void) slprintf(numbuf, sizeof(numbuf), "%d", uid);
340 script_setenv("ORIG_UID", numbuf, 0);
341
342 ngroups = getgroups(NGROUPS_MAX, groups);
343
344 /*
345 * Initialize magic number generator now so that protocols may
346 * use magic numbers in initialization.
347 */
348 magic_init();
349
350 progname = *argv;
351 prepass = 0;
352 /*
353 * Initialize to the standard option set, then parse, in order, the
354 * system options file, the user's options file, the tty's options file,
355 * and the command line arguments. At last, install the options declared
356 * by each protocol into the extra_option list.
357 */
358 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
359 (*protp->init)(0);
360 if (protp->options != NULL) {
361 add_options(protp->options);
362 }
363 }
364
365 /*
366 * Install "generic" options into the extra_options list.
367 */
368 add_options(auth_options);
369 add_options(general_options);
370
371 /* Install any system-specific options (or remove unusable ones) */
372 sys_options();
373
374 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
375 || !options_from_user())
376 exit(EXIT_OPTION_ERROR);
377
378 /* scan command line and options files to find device name */
379 prepass = 1;
380 (void) parse_args(argc-1, argv+1);
381 prepass = 0;
382
383 /*
384 * Work out the device name, if it hasn't already been specified.
385 */
386 using_pty = notty || ptycommand != NULL || pty_socket != NULL;
387 if (!using_pty && default_device && !direct_tty) {
388 char *p;
389
390 if (!isatty(0) || (p = ttyname(0)) == NULL) {
391 option_error("no device specified and stdin is not a tty");
392 exit(EXIT_OPTION_ERROR);
393 }
394 (void) strlcpy(devnam, p, sizeof(devnam));
395 if (stat(devnam, &devstat) < 0)
396 fatal("Couldn't stat default device %s: %m", devnam);
397 }
398
399 /*
400 * Parse the tty options file and the command line.
401 * The per-tty options file should not change
402 * ptycommand, pty_socket, notty or devnam.
403 */
404 devnam_fixed = 1;
405 if (!using_pty && !direct_tty) {
406 if (!options_for_tty())
407 exit(EXIT_OPTION_ERROR);
408 }
409
410 devnam_fixed = 0;
411 if (!parse_args(argc-1, argv+1))
412 exit(EXIT_OPTION_ERROR);
413
414 /*
415 * Check that we are running as root.
416 */
417 if (geteuid() != 0) {
418 option_error("must be root to run %s, since it is not setuid-root",
419 argv[0]);
420 exit(EXIT_NOT_ROOT);
421 }
422
423 if (!ppp_available()) {
424 option_error(no_ppp_msg);
425 exit(EXIT_NO_KERNEL_SUPPORT);
426 }
427
428 /*
429 * Check that the options given are valid and consistent.
430 */
431 if (!sys_check_options())
432 exit(EXIT_OPTION_ERROR);
433 auth_check_options();
434 #ifdef HAVE_MULTILINK
435 mp_check_options();
436 #endif
437 for (i = 0; (protp = protocols[i]) != NULL; ++i)
438 if (protp->enabled_flag && protp->check_options != NULL)
439 (*protp->check_options)();
440 if (demand && (connect_script == NULL)) {
441 option_error("connect script is required for demand-dialling\n");
442 exit(EXIT_OPTION_ERROR);
443 }
444 if (updetach && (nodetach || demand)) {
445 option_error("updetach cannot be used with %s",
446 nodetach ? "nodetach" : "demand");
447 exit(EXIT_OPTION_ERROR);
448 }
449 /* default holdoff to 0 if no connect script has been given */
450 if ((connect_script == NULL) && !holdoff_specified)
451 holdoff = 0;
452
453 if (using_pty || direct_tty) {
454 if (!default_device) {
455 option_error("%s option precludes specifying device name",
456 notty? "notty": "pty");
457 exit(EXIT_OPTION_ERROR);
458 }
459 if (ptycommand != NULL && (notty || direct_tty)) {
460 option_error("pty option is incompatible with notty option");
461 exit(EXIT_OPTION_ERROR);
462 }
463 if (pty_socket != NULL && (ptycommand != NULL || notty ||
464 direct_tty)) {
465 option_error("socket option is incompatible with pty and notty");
466 exit(EXIT_OPTION_ERROR);
467 }
468 default_device = notty || direct_tty;
469 lockflag = 0;
470 modem = 0;
471 if (default_device && log_to_fd <= 1)
472 log_to_fd = -1;
473 } else {
474 /*
475 * If the user has specified a device which is the same as
476 * the one on stdin, pretend they didn't specify any.
477 * If the device is already open read/write on stdin,
478 * we assume we don't need to lock it, and we can open it as root.
479 */
480 if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
481 && statbuf.st_rdev == devstat.st_rdev) {
482 default_device = 1;
483 fdflags = fcntl(0, F_GETFL);
484 if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
485 privopen = 1;
486 }
487 }
488 if (default_device)
489 nodetach = 1;
490
491 /*
492 * Don't send log messages to the serial port, it tends to
493 * confuse the peer. :-)
494 */
495 if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
496 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
497 log_to_fd = -1;
498 early_log = 0;
499
500 if (debug)
501 (void) setlogmask(LOG_UPTO(LOG_DEBUG));
502
503 /*
504 * Initialize system-dependent stuff.
505 */
506 if (check_options_hook != NULL &&
507 (*check_options_hook)(uid) == -1) {
508 exit(EXIT_OPTION_ERROR);
509 }
510 sys_init(!devnam_info.priv && !privopen);
511
512 #ifdef HAVE_MULTILINK
513 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
514 if (pppdb != NULL) {
515 (void) slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
516 update_db_entry();
517 } else {
518 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
519 if (multilink) {
520 warn("Warning: disabling multilink");
521 multilink = 0;
522 }
523 }
524 #endif
525
526 /*
527 * Detach ourselves from the terminal, if required, and identify
528 * who is running us. Printing to stderr stops here unless
529 * nodetach or updetach is set.
530 */
531 if (!nodetach && !updetach)
532 detach();
533 p = getlogin();
534 if (p == NULL) {
535 pw = getpwuid(uid);
536 if (pw != NULL && pw->pw_name != NULL)
537 p = pw->pw_name;
538 else
539 p = "(unknown)";
540 }
541 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
542 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
543 script_setenv("PPPLOGNAME", p, 0);
544
545 if (devnam[0] != '\0')
546 script_setenv("DEVICE", devnam, 1);
547 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid());
548 script_setenv("PPPD_PID", numbuf, 1);
549
550 setup_signals();
551
552 waiting = 0;
553
554 create_linkpidfile();
555
556 /*
557 * If we're doing dial-on-demand, set up the interface now.
558 */
559 if (demand) {
560 /*
561 * Open the loopback channel and set it up to be the ppp interface.
562 */
563 #ifdef HAVE_MULTILINK
564 (void) tdb_writelock(pppdb);
565 #endif
566 set_ifunit(1);
567 fd_loop = open_ppp_loopback();
568 #ifdef HAVE_MULTILINK
569 (void) tdb_writeunlock(pppdb);
570 #endif
571
572 /*
573 * Configure the interface and mark it up, etc.
574 */
575 demand_conf();
576 }
577
578 new_phase(PHASE_INITIALIZED);
579 do_callback = 0;
580 for (;;) {
581
582 need_holdoff = 1;
583 ttyfd = -1;
584 real_ttyfd = -1;
585 status = EXIT_OK;
586 ++unsuccess;
587 doing_callback = do_callback;
588 do_callback = 0;
589
590 if (demand && !doing_callback) {
591 /*
592 * Don't do anything until we see some activity.
593 */
594 kill_link = 0;
595 new_phase(PHASE_DORMANT);
596 demand_unblock();
597 add_fd(fd_loop);
598 for (;;) {
599 if (sigsetjmp(sigjmp, 1) == 0) {
600 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
601 if (kill_link || got_sigchld) {
602 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
603 } else {
604 waiting = 1;
605 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
606 wait_input(timeleft(&timo));
607 }
608 }
609 waiting = 0;
610 calltimeout();
611 if (kill_link) {
612 if (!persist)
613 break;
614 kill_link = 0;
615 }
616 if (get_loop_output())
617 break;
618 if (got_sigchld)
619 (void) reap_kids(0);
620 }
621 remove_fd(fd_loop);
622 if (kill_link && !persist)
623 break;
624
625 /*
626 * Now we want to bring up the link.
627 */
628 demand_block();
629 info("Starting link");
630 }
631
632 new_phase(doing_callback ? PHASE_CALLINGBACK : PHASE_SERIALCONN);
633
634 /*
635 * Get a pty master/slave pair if the pty, notty, socket,
636 * or record options were specified.
637 */
638 (void) strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
639 pty_master = -1;
640 pty_slave = -1;
641 if (using_pty || record_file != NULL) {
642 if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) {
643 error("Couldn't allocate pseudo-tty");
644 status = EXIT_FATAL_ERROR;
645 goto fail;
646 }
647 set_up_tty(pty_slave, 1);
648 }
649
650 /*
651 * Lock the device if we've been asked to.
652 */
653 status = EXIT_LOCK_FAILED;
654 if (lockflag && !privopen && !direct_tty) {
655 if (lock(devnam) < 0)
656 goto fail;
657 locked = 1;
658 }
659
660 /*
661 * Open the serial device and set it up to be the ppp interface.
662 * First we open it in non-blocking mode so we can set the
663 * various termios flags appropriately. If we aren't dialling
664 * out and we want to use the modem lines, we reopen it later
665 * in order to wait for the carrier detect signal from the modem.
666 */
667 hungup = 0;
668 kill_link = 0;
669 connector = doing_callback? callback_script: connect_script;
670 if (direct_tty) {
671 ttyfd = 0;
672 } else if (devnam[0] != '\0') {
673 for (;;) {
674 /* If the user specified the device name, become the
675 user before opening it. */
676 int err;
677 if (!devnam_info.priv && !privopen)
678 (void) seteuid(uid);
679 if ((ttyfd = sys_extra_fd()) < 0)
680 ttyfd = open(devnam, O_NONBLOCK | O_RDWR);
681 err = errno;
682 if (!devnam_info.priv && !privopen)
683 (void) seteuid(0);
684 if (ttyfd >= 0)
685 break;
686 errno = err;
687 if (err != EINTR) {
688 error("Failed to open %s: %m", devnam);
689 status = EXIT_OPEN_FAILED;
690 }
691 if (!persist || err != EINTR)
692 goto fail;
693 }
694 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
695 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
696 warn("Couldn't reset non-blocking mode on device: %m");
697
698 /*
699 * Do the equivalent of `mesg n' to stop broadcast messages.
700 */
701 if (fstat(ttyfd, &statbuf) < 0
702 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
703 warn("Couldn't restrict write permissions to %s: %m", devnam);
704 } else
705 tty_mode = statbuf.st_mode;
706
707 /*
708 * Set line speed, flow control, etc.
709 * If we have a non-null connection or initializer script,
710 * on most systems we set CLOCAL for now so that we can talk
711 * to the modem before carrier comes up. But this has the
712 * side effect that we might miss it if CD drops before we
713 * get to clear CLOCAL below. On systems where we can talk
714 * successfully to the modem with CLOCAL clear and CD down,
715 * we could clear CLOCAL at this point.
716 */
717 set_up_tty(ttyfd, ((connector != NULL && connector[0] != '\0')
718 || initializer != NULL));
719 real_ttyfd = ttyfd;
720 }
721
722 /*
723 * If the pty, socket, notty and/or record option was specified,
724 * start up the character shunt now.
725 */
726 status = EXIT_PTYCMD_FAILED;
727 if (ptycommand != NULL) {
728 if (record_file != NULL) {
729 int ipipe[2], opipe[2], ok;
730
731 if (pipe(ipipe) < 0 || pipe(opipe) < 0)
732 fatal("Couldn't create pipes for record option: %m");
733 dbglog("starting charshunt for pty option");
734 ok = device_script(ptycommand, opipe[0], ipipe[1], 1,
735 "record") == 0 && start_charshunt(ipipe[0], opipe[1]);
736 (void) close(ipipe[0]);
737 (void) close(ipipe[1]);
738 (void) close(opipe[0]);
739 (void) close(opipe[1]);
740 if (!ok)
741 goto fail;
742 } else {
743 if (device_script(ptycommand, pty_master, pty_master, 1,
744 "pty") < 0)
745 goto fail;
746 ttyfd = pty_slave;
747 (void) close(pty_master);
748 pty_master = -1;
749 }
750 } else if (pty_socket != NULL) {
751 int fd = open_socket(pty_socket);
752 if (fd < 0)
753 goto fail;
754 dbglog("starting charshunt for socket option");
755 if (!start_charshunt(fd, fd))
756 goto fail;
757 } else if (notty) {
758 dbglog("starting charshunt for notty option");
759 if (!start_charshunt(0, 1))
760 goto fail;
761 } else if (record_file != NULL) {
762 dbglog("starting charshunt for record option");
763 if (!start_charshunt(ttyfd, ttyfd))
764 goto fail;
765 }
766
767 /* run connection script */
768 if (((connector != NULL) && (connector[0] != '\0')) || initializer) {
769 if (real_ttyfd != -1) {
770 /* XXX do this if doing_callback == CALLBACK_DIALIN? */
771 if (!default_device && modem && !direct_tty) {
772 setdtr(real_ttyfd, 0); /* in case modem is off hook */
773 (void) sleep(1);
774 setdtr(real_ttyfd, 1);
775 }
776 }
777
778 if ((initializer != NULL) && (initializer[0] != '\0')) {
779 if (device_script(initializer, ttyfd, ttyfd, 0, "init") < 0) {
780 error("Initializer script failed");
781 status = EXIT_INIT_FAILED;
782 goto fail;
783 }
784 if (kill_link)
785 goto disconnect;
786
787 info("Serial port initialized.");
788 }
789
790 if ((connector != NULL) && (connector[0] != '\0')) {
791 if (device_script(connector, ttyfd, ttyfd, 0, "connect") < 0) {
792 error("Connect script failed");
793 status = EXIT_CONNECT_FAILED;
794 goto fail;
795 }
796 if (kill_link)
797 goto disconnect;
798
799 info("Serial connection established.");
800 }
801
802 /*
803 * Clear CLOCAL if modem option -- we now have carrier
804 * established, and we should respect loss of carrier.
805 */
806 if (real_ttyfd != -1)
807 set_up_tty(real_ttyfd, 0);
808
809 if (doing_callback == CALLBACK_DIALIN)
810 connector = NULL;
811 }
812
813 /* reopen tty if necessary to wait for carrier */
814 if (connector == NULL && modem && devnam[0] != '\0' && !direct_tty) {
815 for (;;) {
816 if ((i = open(devnam, O_RDWR)) >= 0)
817 break;
818 if (errno != EINTR) {
819 error("Failed to reopen %s: %m", devnam);
820 status = EXIT_OPEN_FAILED;
821 }
822 if (!persist || errno != EINTR || hungup || kill_link)
823 goto fail;
824 }
825 (void) close(i);
826 }
827
828 (void) slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
829 script_setenv("SPEED", numbuf, 0);
830
831 /* run welcome script, if any */
832 if ((welcomer != NULL) && (welcomer[0] != '\0')) {
833 if (device_script(welcomer, ttyfd, ttyfd, 0, "welcome") < 0)
834 warn("Welcome script failed");
835 }
836
837 /* set up the serial device as a ppp interface */
838 #ifdef HAVE_MULTILINK
839 (void) tdb_writelock(pppdb);
840 #endif
841 fd_ppp = establish_ppp(ttyfd);
842 if (fd_ppp < 0) {
843 #ifdef HAVE_MULTILINK
844 (void) tdb_writeunlock(pppdb);
845 #endif
846 status = EXIT_FATAL_ERROR;
847 goto disconnect;
848 }
849
850 if (!demand && ifunit >= 0)
851 set_ifunit(1);
852 #ifdef HAVE_MULTILINK
853 (void) tdb_writeunlock(pppdb);
854 #endif
855
856 /*
857 * Start opening the connection and wait for
858 * incoming events (reply, timeout, etc.).
859 */
860 notice("Connect: %s <--> %s", ifname, ppp_devnam);
861 (void) gettimeofday(&start_time, NULL);
862 link_stats_valid = 0;
863 script_unsetenv("CONNECT_TIME");
864 script_unsetenv("BYTES_SENT");
865 script_unsetenv("BYTES_RCVD");
866 lcp_lowerup(0);
867
868 /* Mostly for accounting purposes */
869 new_phase(PHASE_CONNECTED);
870
871 /*
872 * If we are initiating this connection, wait for a short
873 * time for something from the peer. This can avoid bouncing
874 * our packets off his tty before he has it set up.
875 */
876 add_fd(fd_ppp);
877 if (connect_delay != 0 && (connector != NULL || ptycommand != NULL)) {
878 struct timeval t;
879 t.tv_sec = connect_delay / 1000;
880 t.tv_usec = connect_delay % 1000;
881 wait_input(&t);
882 }
883
884 lcp_open(0); /* Start protocol */
885 open_ccp_flag = 0;
886 status = EXIT_NEGOTIATION_FAILED;
887 new_phase(PHASE_ESTABLISH);
888 while (phase != PHASE_DEAD) {
889 if (sigsetjmp(sigjmp, 1) == 0) {
890 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
891 if (kill_link || open_ccp_flag || got_sigchld) {
892 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
893 } else {
894 waiting = 1;
895 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
896 wait_input(timeleft(&timo));
897 }
898 }
899 waiting = 0;
900 calltimeout();
901 get_input();
902 if (kill_link) {
903 lcp_close(0, "User request");
904 kill_link = 0;
905 }
906 if (open_ccp_flag) {
907 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
908 /* Uncloak ourselves. */
909 ccp_fsm[0].flags &= ~OPT_SILENT;
910 (*ccp_protent.open)(0);
911 }
912 open_ccp_flag = 0;
913 }
914 if (got_sigchld)
915 (void) reap_kids(0); /* Don't leave dead kids lying around */
916 }
917
918 /*
919 * Print connect time and statistics.
920 */
921 if (link_stats_valid) {
922 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
923 info("Connect time %d.%d minutes.", t/10, t%10);
924 info("Sent %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F
925 " packets), received %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F
926 " packets).",
927 link_stats.bytes_out, link_stats.pkts_out,
928 link_stats.bytes_in, link_stats.pkts_in);
929 }
930
931 /*
932 * Delete pid file before disestablishing ppp. Otherwise it
933 * can happen that another pppd gets the same unit and then
934 * we delete its pid file.
935 */
936 if (!demand) {
937 if (pidfilename[0] != '\0'
938 && unlink(pidfilename) < 0 && errno != ENOENT)
939 warn("unable to delete pid file %s: %m", pidfilename);
940 pidfilename[0] = '\0';
941 }
942
943 /*
944 * If we may want to bring the link up again, transfer
945 * the ppp unit back to the loopback. Set the
946 * real serial device back to its normal mode of operation.
947 */
948 remove_fd(fd_ppp);
949 clean_check();
950 if (demand)
951 restore_loop();
952 disestablish_ppp(ttyfd);
953 fd_ppp = -1;
954 if (!hungup)
955 lcp_lowerdown(0);
956 if (!demand)
957 script_unsetenv("IFNAME");
958
959 /*
960 * Run disconnector script, if requested.
961 * XXX we may not be able to do this if the line has hung up!
962 */
963 disconnect:
964 if ((disconnect_script != NULL) && (disconnect_script[0] != '\0') &&
965 !hungup) {
966 new_phase(PHASE_DISCONNECT);
967 if (real_ttyfd >= 0)
968 set_up_tty(real_ttyfd, 1);
969 if (device_script(disconnect_script, ttyfd, ttyfd, 0,
970 "disconnect") < 0) {
971 warn("disconnect script failed");
972 } else {
973 info("Serial link disconnected.");
974 }
975 }
976
977 fail:
978 if (pty_master >= 0)
979 (void) close(pty_master);
980 if (pty_slave >= 0) {
981 (void) close(pty_slave);
982 pty_slave = -1;
983 }
984 if (real_ttyfd >= 0)
985 close_tty();
986 if (locked) {
987 locked = 0;
988 unlock();
989 }
990
991 if (!demand) {
992 if (pidfilename[0] != '\0'
993 && unlink(pidfilename) < 0 && errno != ENOENT)
994 warn("unable to delete pid file %s: %m", pidfilename);
995 pidfilename[0] = '\0';
996 }
997
998 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
999 break;
1000
1001 kill_link = 0;
1002 if (demand)
1003 demand_discard();
1004 t = need_holdoff? holdoff: 0;
1005 if (holdoff_hook != NULL)
1006 t = (*holdoff_hook)();
1007 if (t > 0) {
1008 new_phase(PHASE_HOLDOFF);
1009 TIMEOUT(holdoff_end, NULL, t);
1010 do {
1011 if (sigsetjmp(sigjmp, 1) == 0) {
1012 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
1013 if (kill_link || got_sigchld) {
1014 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
1015 } else {
1016 waiting = 1;
1017 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
1018 wait_input(timeleft(&timo));
1019 }
1020 }
1021 waiting = 0;
1022 calltimeout();
1023 if (kill_link) {
1024 kill_link = 0;
1025 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
1026 }
1027 if (got_sigchld)
1028 (void) reap_kids(0);
1029 } while (phase == PHASE_HOLDOFF);
1030 if (!persist)
1031 break;
1032 }
1033 }
1034
1035 /* Wait for scripts to finish */
1036 final_reap();
1037
1038 die(status);
1039 return (0);
1040 }
1041
1042 /*
1043 * setup_signals - initialize signal handling.
1044 */
1045 static void
1046 setup_signals()
1047 {
1048 struct sigaction sa;
1049
1050 /*
1051 * Compute mask of all interesting signals and install signal handlers
1052 * for each. Only one signal handler may be active at a time. Therefore,
1053 * all other signals should be masked when any handler is executing.
1054 */
1055 (void) sigemptyset(&main_sigmask);
1056 (void) sigaddset(&main_sigmask, SIGHUP);
1057 (void) sigaddset(&main_sigmask, SIGINT);
1058 (void) sigaddset(&main_sigmask, SIGTERM);
1059 (void) sigaddset(&main_sigmask, SIGCHLD);
1060 (void) sigaddset(&main_sigmask, SIGUSR2);
1061
1062 #define SIGNAL(s, handler) if (1) { \
1063 sa.sa_handler = handler; \
1064 if (sigaction(s, &sa, NULL) < 0) \
1065 fatal("Couldn't establish signal handler (%d): %m", s); \
1066 } else ((void)0)
1067
1068 sa.sa_mask = main_sigmask;
1069 sa.sa_flags = 0;
1070 /*CONSTANTCONDITION*/ SIGNAL(SIGHUP, hup); /* Hangup */
1071 /*CONSTANTCONDITION*/ SIGNAL(SIGINT, term); /* Interrupt */
1072 /*CONSTANTCONDITION*/ SIGNAL(SIGTERM, term); /* Terminate */
1073 /*CONSTANTCONDITION*/ SIGNAL(SIGCHLD, chld);
1074
1075 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
1076 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
1077
1078 /*
1079 * Install a handler for other signals which would otherwise
1080 * cause pppd to exit without cleaning up.
1081 */
1082 /*CONSTANTCONDITION*/ SIGNAL(SIGABRT, bad_signal);
1083 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, bad_signal);
1084 /*CONSTANTCONDITION*/ SIGNAL(SIGFPE, bad_signal);
1085 /*CONSTANTCONDITION*/ SIGNAL(SIGILL, bad_signal);
1086 /*CONSTANTCONDITION*/ SIGNAL(SIGPIPE, bad_signal);
1087 /*CONSTANTCONDITION*/ SIGNAL(SIGQUIT, bad_signal);
1088 #ifndef DEBUG
1089 /*CONSTANTCONDITION*/ SIGNAL(SIGSEGV, bad_signal);
1090 #endif
1091 #ifdef SIGBUS
1092 /*CONSTANTCONDITION*/ SIGNAL(SIGBUS, bad_signal);
1093 #endif
1094 #ifdef SIGEMT
1095 /*CONSTANTCONDITION*/ SIGNAL(SIGEMT, bad_signal);
1096 #endif
1097 #ifdef SIGPOLL
1098 /*CONSTANTCONDITION*/ SIGNAL(SIGPOLL, bad_signal);
1099 #endif
1100 #ifdef SIGPROF
1101 /*CONSTANTCONDITION*/ SIGNAL(SIGPROF, bad_signal);
1102 #endif
1103 #ifdef SIGSYS
1104 /*CONSTANTCONDITION*/ SIGNAL(SIGSYS, bad_signal);
1105 #endif
1106 #ifdef SIGTRAP
1107 /*CONSTANTCONDITION*/ SIGNAL(SIGTRAP, bad_signal);
1108 #endif
1109 #ifdef SIGVTALRM
1110 /*CONSTANTCONDITION*/ SIGNAL(SIGVTALRM, bad_signal);
1111 #endif
1112 #ifdef SIGXCPU
1113 /*CONSTANTCONDITION*/ SIGNAL(SIGXCPU, bad_signal);
1114 #endif
1115 #ifdef SIGXFSZ
1116 /*CONSTANTCONDITION*/ SIGNAL(SIGXFSZ, bad_signal);
1117 #endif
1118
1119 /*
1120 * Apparently we can get a SIGPIPE when we call syslog, if
1121 * syslogd has died and been restarted. Ignoring it seems
1122 * be sufficient.
1123 */
1124 (void) signal(SIGPIPE, SIG_IGN);
1125 }
1126
1127 /*
1128 * set_ifunit - do things we need to do once we know which ppp
1129 * unit we are using.
1130 */
1131 void
1132 set_ifunit(iskey)
1133 int iskey;
1134 {
1135 sys_ifname();
1136 info("Using interface %s", ifname);
1137 script_setenv("IFNAME", ifname, iskey);
1138 if (iskey) {
1139 create_pidfile(); /* write pid to file */
1140 create_linkpidfile();
1141 }
1142 }
1143
1144 /*
1145 * detach - detach us from the controlling terminal.
1146 */
1147 void
1148 detach()
1149 {
1150 pid_t pid;
1151 char numbuf[16];
1152
1153 if (detached)
1154 return;
1155 if ((pid = fork()) == (pid_t)-1) {
1156 error("Couldn't detach (fork failed: %m)");
1157 die(1); /* or just return? */
1158 }
1159 if (pid != (pid_t)0) {
1160 /* parent */
1161 if (locked)
1162 (void) relock(pid);
1163 exit(0); /* parent dies */
1164 }
1165 (void) setsid();
1166 /*
1167 * Fork again to relinquish session leadership. This is needed
1168 * to prevent the daemon from acquiring controlling terminal.
1169 */
1170 if ((pid = fork()) == (pid_t)-1) {
1171 error("Couldn't detach (second fork failed: %m)");
1172 die(1); /* or just return? */
1173 }
1174 if (pid != (pid_t)0) {
1175 /* parent */
1176 if (locked)
1177 (void) relock(pid);
1178 exit(0); /* parent dies */
1179 }
1180 (void) chdir("/");
1181 (void) close(0);
1182 (void) close(1);
1183 (void) close(2);
1184 detached = 1;
1185 if (!log_to_file && !log_to_specific_fd)
1186 log_to_fd = -1;
1187 /* update pid files if they have been written already */
1188 if (pidfilename[0] != '\0')
1189 create_pidfile();
1190 if (linkpidfile[0] != '\0')
1191 create_linkpidfile();
1192 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid());
1193 script_setenv("PPPD_PID", numbuf, 1);
1194 }
1195
1196 /*
1197 * reopen_log - (re)open our connection to syslog.
1198 */
1199 void
1200 reopen_log()
1201 {
1202 #ifdef ULTRIX
1203 openlog("pppd", LOG_PID);
1204 #else
1205 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
1206 (void) setlogmask(LOG_UPTO(LOG_INFO));
1207 #endif
1208 }
1209
1210 /*
1211 * Create a file containing our process ID.
1212 */
1213 static void
1214 create_pidfile()
1215 {
1216 FILE *pidfile;
1217
1218 (void) slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
1219 _PATH_VARRUN, ifname);
1220 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
1221 (void) fprintf(pidfile, "%u\n", (unsigned)getpid());
1222 (void) fclose(pidfile);
1223 } else {
1224 error("Failed to create pid file %s: %m", pidfilename);
1225 pidfilename[0] = '\0';
1226 }
1227 }
1228
1229 static void
1230 create_linkpidfile()
1231 {
1232 FILE *pidfile;
1233
1234 if (linkname[0] == '\0')
1235 return;
1236 script_setenv("LINKNAME", linkname, 1);
1237 (void) slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
1238 _PATH_VARRUN, linkname);
1239 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
1240 (void) fprintf(pidfile, "%u\n", (unsigned)getpid());
1241 if (ifname[0] != '\0')
1242 (void) fprintf(pidfile, "%s\n", ifname);
1243 (void) fclose(pidfile);
1244 } else {
1245 error("Failed to create pid file %s: %m", linkpidfile);
1246 linkpidfile[0] = '\0';
1247 }
1248 }
1249
1250 /*
1251 * holdoff_end - called via a timeout when the holdoff period ends.
1252 */
1253 /*ARGSUSED*/
1254 static void
1255 holdoff_end(arg)
1256 void *arg;
1257 {
1258 new_phase(PHASE_DORMANT);
1259 }
1260
1261 /* List of protocol names, to make our messages a little more informative. */
1262 struct protocol_list {
1263 u_short proto;
1264 const char *name;
1265 } protocol_list[] = {
1266 { 0x21, "IP" },
1267 { 0x23, "OSI Network Layer" },
1268 { 0x25, "Xerox NS IDP" },
1269 { 0x27, "DECnet Phase IV" },
1270 { 0x29, "Appletalk" },
1271 { 0x2b, "Novell IPX" },
1272 { 0x2d, "VJ compressed TCP/IP" },
1273 { 0x2f, "VJ uncompressed TCP/IP" },
1274 { 0x31, "Bridging PDU" },
1275 { 0x33, "Stream Protocol ST-II" },
1276 { 0x35, "Banyan Vines" },
1277 { 0x37, "Old VJ compressed TCP/IP" },
1278 { 0x39, "AppleTalk EDDP" },
1279 { 0x3b, "AppleTalk SmartBuffered" },
1280 { 0x3d, "Multilink" },
1281 { 0x3f, "NetBIOS Frame" },
1282 { 0x41, "Cisco LAN Extension" },
1283 { 0x43, "Ascom Timeplex" },
1284 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1285 { 0x47, "DCA Remote Lan" },
1286 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1287 { 0x4b, "SNA over 802.2" },
1288 { 0x4d, "SNA" },
1289 { 0x4f, "IP6 Header Compression" },
1290 { 0x51, "KNX Bridging" },
1291 { 0x53, "Encrypted" },
1292 { 0x55, "per-link encrypted" },
1293 { 0x57, "IPv6" },
1294 { 0x59, "PPP Muxing" },
1295 { 0x6f, "Stampede Bridging" },
1296 { 0x73, "MP+" },
1297 { 0xc1, "STMF" },
1298 { 0xfb, "per-link compressed" },
1299 { 0xfd, "compressed datagram" },
1300 { 0x0201, "802.1d Hello Packets" },
1301 { 0x0203, "IBM Source Routing BPDU" },
1302 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1303 { 0x0207, "Cisco Discovery Protocol" },
1304 { 0x0231, "Luxcom" },
1305 { 0x0233, "Sigma Network Systems" },
1306 { 0x0235, "Apple Client Server Protocol" },
1307 { 0x0281, "MPLS Unicast" },
1308 { 0x0283, "MPLS Multicast" },
1309 { 0x0285, "IEEE p1284.4" },
1310 { 0x0287, "ETSI TETRA TNP1" },
1311 { 0x4021, "Stacker LZS" },
1312 { 0x8021, "Internet Protocol Control Protocol" },
1313 { 0x8023, "OSI Network Layer Control Protocol" },
1314 { 0x8025, "Xerox NS IDP Control Protocol" },
1315 { 0x8027, "DECnet Phase IV Control Protocol" },
1316 { 0x8029, "Appletalk Control Protocol" },
1317 { 0x802b, "Novell IPX Control Protocol" },
1318 { 0x8031, "Bridging Control Protocol" },
1319 { 0x8033, "Stream Protocol Control Protocol" },
1320 { 0x8035, "Banyan Vines Control Protocol" },
1321 { 0x803f, "NetBIOS Frames Control Protocol" },
1322 { 0x8041, "Cisco LAN Extension Control Protocol" },
1323 { 0x8043, "Ascom Timeplex Control Protocol" },
1324 { 0x8045, "Fujitsu LBLB Control Protocol" },
1325 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1326 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1327 { 0x804b, "SNA over 802.2 Control Protocol" },
1328 { 0x804d, "SNA Control Protocol" },
1329 { 0x8051, "KNX Bridging Control Protocol" },
1330 { 0x8053, "Encryption Control Protocol" },
1331 { 0x8055, "Per-link Encryption Control Protocol" },
1332 { 0x8057, "IPv6 Control Protocol" },
1333 { 0x806f, "Stampede Bridging Control Protocol" },
1334 { 0x80c1, "STMF Control Protocol" },
1335 { 0x80fb, "Per-link Compression Control Protocol" },
1336 { 0x80fd, "Compression Control Protocol" },
1337 { 0x8207, "Cisco Discovery Control Protocol" },
1338 { 0x8235, "Apple Client Server Control Protocol" },
1339 { 0x8281, "MPLS Control Protocol" },
1340 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1341 { 0xc021, "Link Control Protocol" },
1342 { 0xc023, "Password Authentication Protocol" },
1343 { 0xc025, "Link Quality Report" },
1344 { 0xc027, "Shiva Password Authentication Protocol" },
1345 { 0xc029, "CallBack Control Protocol (CBCP)" },
1346 { 0xc02b, "Bandwidth Allocation Control Protocol" },
1347 { 0xc02d, "BAP" },
1348 { 0xc081, "Container Control Protocol" },
1349 { 0xc223, "Challenge Handshake Authentication Protocol" },
1350 { 0xc227, "Extensible Authentication Protocol" },
1351 { 0xc281, "Funk Proprietary Authentication Protocol" },
1352 { 0, NULL },
1353 };
1354
1355 /*
1356 * protocol_name - find a name for a PPP protocol.
1357 */
1358 const char *
1359 protocol_name(proto)
1360 int proto;
1361 {
1362 struct protocol_list *lp;
1363
1364 for (lp = protocol_list; lp->proto != 0; ++lp)
1365 if (proto == lp->proto)
1366 return (lp->name);
1367 return (NULL);
1368 }
1369
1370 static const char *phase_names[] = { PHASE__NAMES };
1371
1372 const char *
1373 phase_name(pval)
1374 int pval;
1375 {
1376 static char buf[32];
1377
1378 if (pval < 0 || pval >= Dim(phase_names)) {
1379 (void) slprintf(buf, sizeof (buf), "unknown %d", pval);
1380 return ((const char *)buf);
1381 }
1382 return (phase_names[pval]);
1383 }
1384
1385 /*
1386 * get_input - called when incoming data is available.
1387 */
1388 static void
1389 get_input()
1390 {
1391 int len, i;
1392 u_char *p;
1393 u_short protocol;
1394 struct protent *protp;
1395 const char *pname;
1396
1397 p = inpacket_buf; /* point to beginning of packet buffer */
1398
1399 len = read_packet(inpacket_buf);
1400 if (len < 0)
1401 return;
1402
1403 if (len == 0) {
1404 notice("Modem hangup");
1405 hungup = 1;
1406 status = EXIT_HANGUP;
1407 lcp_lowerdown(0); /* serial link is no longer available */
1408 link_terminated(0);
1409 return;
1410 }
1411
1412 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1413 dbglog("rcvd %P", p, len);
1414
1415 if (len < PPP_HDRLEN) {
1416 dbglog("Discarded short packet (%d < %d)", len, PPP_HDRLEN);
1417 return;
1418 }
1419
1420 p += 2; /* Skip address and control */
1421 GETSHORT(protocol, p);
1422 len -= PPP_HDRLEN;
1423
1424 pname = debug ? NULL : protocol_name(protocol);
1425
1426 /*
1427 * Toss all non-LCP packets unless LCP is in Opened state and
1428 * discard non-authentication protocols if we're not yet
1429 * authenticated.
1430 */
1431 if ((protocol != PPP_LCP &&
1432 (phase < PHASE_AUTHENTICATE || phase > PHASE_RUNNING)) ||
1433 (phase <= PHASE_AUTHENTICATE &&
1434 !(protocol == PPP_LCP || protocol == PPP_LQR ||
1435 protocol == PPP_PAP || protocol == PPP_CHAP))) {
1436 if (pname == NULL)
1437 dbglog("Discarded proto 0x%x in %s phase",
1438 protocol, phase_name(phase));
1439 else
1440 dbglog("Discarded %s (0x%x) in %s phase",
1441 pname, protocol, phase_name(phase));
1442 return;
1443 }
1444
1445 /*
1446 * Upcall the proper protocol input routine.
1447 */
1448 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1449 if (protp->protocol == protocol && protp->enabled_flag) {
1450 (*protp->input)(0, p, len);
1451 return;
1452 }
1453 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1454 && protp->datainput != NULL) {
1455 (*protp->datainput)(0, p, len);
1456 return;
1457 }
1458 }
1459
1460 if (debug) {
1461 if (pname != NULL)
1462 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1463 else
1464 warn("Unsupported protocol 0x%x received", protocol);
1465 }
1466 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1467 }
1468
1469 /*
1470 * new_phase - signal the start of a new phase of pppd's operation.
1471 */
1472 void
1473 new_phase(p)
1474 int p;
1475 {
1476 if (new_phase_hook != NULL)
1477 (*new_phase_hook)(p, phase);
1478 phase = p;
1479 }
1480
1481 /*
1482 * die - clean up state and exit with the specified status.
1483 */
1484 void
1485 die(status)
1486 int status;
1487 {
1488 cleanup();
1489 if (phase != PHASE_EXIT) {
1490 syslog(LOG_INFO, "Exit.");
1491 new_phase(PHASE_EXIT);
1492 }
1493 exit(status);
1494 }
1495
1496 /*
1497 * cleanup - restore anything which needs to be restored before we exit
1498 */
1499 static void
1500 cleanup()
1501 {
1502 sys_cleanup(); /* XXX: Need to check if this is okay after close_tty */
1503
1504 if (fd_ppp >= 0) {
1505 fd_ppp = -1;
1506 disestablish_ppp(ttyfd);
1507 }
1508 if (real_ttyfd >= 0)
1509 close_tty();
1510
1511 if (pidfilename[0] != '\0' && unlink(pidfilename) < 0 && errno != ENOENT)
1512 warn("unable to delete pid file %s: %m", pidfilename);
1513 pidfilename[0] = '\0';
1514 if (linkpidfile[0] != '\0' && unlink(linkpidfile) < 0 && errno != ENOENT)
1515 warn("unable to delete pid file %s: %m", linkpidfile);
1516 linkpidfile[0] = '\0';
1517
1518 if (locked) {
1519 locked = 0;
1520 unlock();
1521 }
1522
1523 #ifdef HAVE_MULTILINK
1524 if (pppdb != NULL) {
1525 cleanup_db();
1526 pppdb = NULL;
1527 }
1528 #endif
1529 }
1530
1531 /*
1532 * close_tty - restore the terminal device and close it.
1533 */
1534 static void
1535 close_tty()
1536 {
1537 int fd = real_ttyfd;
1538
1539 real_ttyfd = -1;
1540
1541 /* drop dtr to hang up */
1542 if (!default_device && modem) {
1543 setdtr(fd, 0);
1544 /*
1545 * This sleep is in case the serial port has CLOCAL set by default,
1546 * and consequently will reassert DTR when we close the device.
1547 */
1548 (void) sleep(1);
1549 }
1550
1551 restore_tty(fd);
1552
1553 if (tty_mode != (mode_t) -1) {
1554 if (fchmod(fd, tty_mode) != 0) {
1555 /* XXX if devnam is a symlink, this will change the link */
1556 if (chmod(devnam, tty_mode) != 0) {
1557 error("Unable to chmod file %s: %m", devnam);
1558 }
1559 }
1560 }
1561
1562 (void) close(fd);
1563 }
1564
1565 /*
1566 * update_link_stats - get stats at link termination.
1567 */
1568 void
1569 update_link_stats(u)
1570 int u;
1571 {
1572 struct timeval now;
1573 char numbuf[32];
1574
1575 if (gettimeofday(&now, NULL) >= 0) {
1576 link_connect_time = now.tv_sec - start_time.tv_sec;
1577 (void) slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1578 script_setenv("CONNECT_TIME", numbuf, 0);
1579 } else {
1580 link_connect_time = 0;
1581 }
1582
1583 if (get_ppp_stats(u, &link_stats)) {
1584 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1585 link_stats.bytes_out);
1586 script_setenv("BYTES_SENT", numbuf, 0);
1587 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1588 link_stats.bytes_in);
1589 script_setenv("BYTES_RCVD", numbuf, 0);
1590 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1591 link_stats.pkts_in);
1592 script_setenv("PKTS_RCVD", numbuf, 0);
1593 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1594 link_stats.pkts_out);
1595 script_setenv("PKTS_SENT", numbuf, 0);
1596 link_stats_valid = 1;
1597 }
1598 }
1599
1600
1601 struct callout {
1602 struct timeval c_time; /* time at which to call routine */
1603 void *c_arg; /* argument to routine */
1604 void (*c_func) __P((void *)); /* routine */
1605 struct callout *c_next;
1606 };
1607
1608 static struct callout *callout = NULL; /* Callout list */
1609 static struct timeval timenow; /* Current time */
1610
1611 /*
1612 * timeout - Schedule a timeout.
1613 *
1614 * Note that this timeout takes the number of seconds, NOT hz (as in
1615 * the kernel).
1616 */
1617 void
1618 timeout(func, arg, time)
1619 void (*func) __P((void *));
1620 void *arg;
1621 int time;
1622 {
1623 struct callout *newp, *p, **pp;
1624
1625 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1626
1627 /*
1628 * Allocate timeout.
1629 */
1630 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1631 novm("callout structure for timeout.");
1632 newp->c_arg = arg;
1633 newp->c_func = func;
1634 (void) gettimeofday(&timenow, NULL);
1635 newp->c_time.tv_sec = timenow.tv_sec + time;
1636 newp->c_time.tv_usec = timenow.tv_usec;
1637
1638 /*
1639 * Find correct place and link it in.
1640 */
1641 for (pp = &callout; (p = *pp) != NULL; pp = &p->c_next)
1642 if (newp->c_time.tv_sec < p->c_time.tv_sec
1643 || (newp->c_time.tv_sec == p->c_time.tv_sec
1644 && newp->c_time.tv_usec < p->c_time.tv_usec))
1645 break;
1646 newp->c_next = p;
1647 *pp = newp;
1648 }
1649
1650
1651 /*
1652 * untimeout - Unschedule a timeout.
1653 */
1654 void
1655 untimeout(func, arg)
1656 void (*func) __P((void *));
1657 void *arg;
1658 {
1659 struct callout **copp, *freep;
1660
1661 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1662
1663 /*
1664 * Find first matching timeout and remove it from the list.
1665 */
1666 for (copp = &callout; (freep = *copp) != NULL; copp = &freep->c_next)
1667 if (freep->c_func == func && freep->c_arg == arg) {
1668 *copp = freep->c_next;
1669 free((char *) freep);
1670 break;
1671 }
1672 }
1673
1674
1675 /*
1676 * calltimeout - Call any timeout routines which are now due.
1677 */
1678 static void
1679 calltimeout()
1680 {
1681 struct callout *p;
1682
1683 while (callout != NULL) {
1684 p = callout;
1685
1686 if (gettimeofday(&timenow, NULL) < 0)
1687 fatal("Failed to get time of day: %m");
1688 if (!(p->c_time.tv_sec < timenow.tv_sec
1689 || (p->c_time.tv_sec == timenow.tv_sec
1690 && p->c_time.tv_usec <= timenow.tv_usec)))
1691 break; /* no, it's not time yet */
1692
1693 callout = p->c_next;
1694 (*p->c_func)(p->c_arg);
1695
1696 free((char *) p);
1697 }
1698 }
1699
1700
1701 /*
1702 * timeleft - return the length of time until the next timeout is due.
1703 */
1704 static struct timeval *
1705 timeleft(tvp)
1706 struct timeval *tvp;
1707 {
1708 if (callout == NULL)
1709 return (NULL);
1710
1711 (void) gettimeofday(&timenow, NULL);
1712 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1713 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1714 if (tvp->tv_usec < 0) {
1715 tvp->tv_usec += 1000000;
1716 tvp->tv_sec -= 1;
1717 }
1718 if (tvp->tv_sec < 0)
1719 tvp->tv_sec = tvp->tv_usec = 0;
1720
1721 return (tvp);
1722 }
1723
1724
1725 /*
1726 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1727 */
1728 static void
1729 kill_my_pg(sig)
1730 int sig;
1731 {
1732 struct sigaction act, oldact;
1733 sigset_t mask;
1734
1735 BZERO(&act, sizeof (act));
1736 act.sa_handler = SIG_IGN;
1737 (void) sigemptyset(&mask);
1738 (void) sigaddset(&mask, sig);
1739 /*
1740 * Ignore signal 'sig' temporarily, before finally re-activating the
1741 * original handler. We need to do it in the following sequence, since
1742 * otherwise the signal handler for 'sig' will be called forever.
1743 */
1744 if (sigaction(sig, &act, &oldact) < 0) {
1745 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig);
1746 }
1747 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
1748 /*
1749 * Send signal 'sig' to all processes whose process group ID is equal
1750 * to the process group ID of the sender.
1751 */
1752 (void) kill(0, sig);
1753 if (sigaction(sig, &oldact, NULL) < 0) {
1754 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig);
1755 }
1756 }
1757
1758
1759 /*
1760 * hup - Catch SIGHUP signal.
1761 *
1762 * Indicates that the physical layer has been disconnected.
1763 * We don't rely on this indication; if the user has sent this
1764 * signal, we just take the link down.
1765 */
1766 static void
1767 hup(sig)
1768 int sig;
1769 {
1770 info("Hangup (SIGHUP)");
1771 kill_link = 1;
1772 if (status != EXIT_HANGUP)
1773 status = EXIT_USER_REQUEST;
1774 if (conn_running > 0)
1775 /* Send the signal to the [dis]connector process(es) also */
1776 kill_my_pg(sig);
1777 if (charshunt_pid)
1778 (void) kill(charshunt_pid, sig);
1779 if (waiting)
1780 siglongjmp(sigjmp, 1);
1781 }
1782
1783
1784 /*
1785 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1786 *
1787 * Indicates that we should initiate a graceful disconnect and exit.
1788 */
1789 /*ARGSUSED*/
1790 static void
1791 term(sig)
1792 int sig;
1793 {
1794 info("Terminating on signal %d.", sig);
1795 persist = 0; /* don't try to restart */
1796 kill_link = 1;
1797 status = EXIT_USER_REQUEST;
1798 if (conn_running > 0)
1799 /* Send the signal to the [dis]connector process(es) also */
1800 kill_my_pg(sig);
1801 if (charshunt_pid)
1802 (void) kill(charshunt_pid, sig);
1803 if (waiting)
1804 siglongjmp(sigjmp, 1);
1805 }
1806
1807
1808 /*
1809 * chld - Catch SIGCHLD signal.
1810 * Sets a flag so we will call reap_kids in the mainline.
1811 */
1812 /*ARGSUSED*/
1813 static void
1814 chld(sig)
1815 int sig;
1816 {
1817 got_sigchld = 1;
1818 if (waiting)
1819 siglongjmp(sigjmp, 1);
1820 }
1821
1822 /*
1823 * toggle_debug - Catch SIGUSR1 signal.
1824 *
1825 * Toggle debug flag.
1826 */
1827 /*ARGSUSED*/
1828 static void
1829 toggle_debug(sig)
1830 int sig;
1831 {
1832 if (debug) {
1833 print_ncpstate(0, NULL);
1834 dbglog("debug logging disabled");
1835 (void) setlogmask(LOG_UPTO(LOG_WARNING));
1836 debug = 0;
1837 } else {
1838 (void) setlogmask(LOG_UPTO(LOG_DEBUG));
1839 dbglog("debug logging enabled");
1840 print_ncpstate(0, NULL);
1841 debug = 1;
1842 }
1843 }
1844
1845
1846 /*
1847 * open_ccp - Catch SIGUSR2 signal.
1848 *
1849 * Try to (re)negotiate compression.
1850 */
1851 /*ARGSUSED*/
1852 static void
1853 open_ccp(sig)
1854 int sig;
1855 {
1856 open_ccp_flag = 1;
1857 if (waiting)
1858 siglongjmp(sigjmp, 1);
1859 }
1860
1861
1862 /*
1863 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1864 */
1865 static void
1866 bad_signal(sig)
1867 int sig;
1868 {
1869 static int crashed = 0;
1870
1871 if (crashed)
1872 _exit(127);
1873 crashed = 1;
1874 error("Fatal signal %d", sig);
1875 if (conn_running > 0)
1876 kill_my_pg(SIGTERM);
1877 if (charshunt_pid)
1878 (void) kill(charshunt_pid, SIGTERM);
1879 die(127);
1880 }
1881
1882
1883 /*
1884 * device_script - run a program to talk to the serial device
1885 * (e.g. to run the connector or disconnector script).
1886 */
1887 static int
1888 device_script(program, in, out, dont_wait, optname)
1889 char *program;
1890 int in, out;
1891 int dont_wait;
1892 char *optname;
1893 {
1894 pid_t pid;
1895 int status = -1;
1896 int errfd;
1897 int envpipe[2];
1898
1899 envpipe[0] = envpipe[1] = -1;
1900 if (!dont_wait && device_pipe_hook != NULL && pipe(envpipe) == -1) {
1901 error("Cannot create pipe for child: %m");
1902 return (-1);
1903 }
1904
1905 ++conn_running;
1906 pid = fork();
1907
1908 if (pid == (pid_t)-1) {
1909 --conn_running;
1910 error("Failed to create child process: %m");
1911 return (-1);
1912 }
1913
1914 if (pid == (pid_t)0) {
1915 sys_close();
1916 closelog();
1917 if (envpipe[0] >= 0) {
1918 if (envpipe[1] <= 2)
1919 envpipe[1] = dup(envpipe[1]);
1920 (void) close(envpipe[0]);
1921 }
1922 if (in == 2) {
1923 /* aargh!!! */
1924 int newin = dup(in);
1925 if (in == out)
1926 out = newin;
1927 in = newin;
1928 } else if (out == 2) {
1929 out = dup(out);
1930 }
1931 if (log_to_fd >= 0) {
1932 if (log_to_fd != 2) {
1933 if (dup2(log_to_fd, 2) < 0)
1934 error("dup2(log_to_fd, STDERR) failed: %m");
1935 }
1936 } else {
1937 (void) close(2);
1938 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1939 if (errfd >= 0 && errfd != 2) {
1940 if (dup2(errfd, 2) < 0)
1941 error("dup2(errfd, STDERR) failed: %m");
1942 (void) close(errfd);
1943 }
1944 }
1945 if (in != 0) {
1946 if (out == 0)
1947 out = dup(out);
1948 if (dup2(in, 0) < 0)
1949 error("dup2(in, STDIN) failed: %m");
1950 }
1951 if (out != 1) {
1952 if (dup2(out, 1) < 0)
1953 error("dup2(out, STDOUT) failed: %m");
1954 }
1955 if (envpipe[0] >= 0 && dup2(envpipe[1], 3) < 0)
1956 error("dup2(pipe, pipeout) failed: %m");
1957 if (real_ttyfd > 2)
1958 (void) close(real_ttyfd);
1959 if (pty_master > 2)
1960 (void) close(pty_master);
1961 if (pty_slave > 2) {
1962 (void) close(pty_slave);
1963 pty_slave = -1;
1964 }
1965 (void) setuid(uid);
1966 if (getuid() != uid) {
1967 error("setuid failed");
1968 exit(1);
1969 }
1970 (void) setgid(getgid());
1971 if (script_env != NULL) {
1972 while (*script_env != NULL) {
1973 if (putenv(*script_env) == -1)
1974 warn("unable to set %s for %s: %m", *script_env, program);
1975 script_env++;
1976 }
1977 }
1978 (void) execl("/bin/sh", "sh", "-c", program, (char *)0);
1979 error("could not exec /bin/sh: %m");
1980 exit(99);
1981 /* NOTREACHED */
1982 }
1983
1984 if (debug)
1985 dbglog("%s option: '%s' started (pid %d)", optname, program, pid);
1986 if (dont_wait) {
1987 record_child(pid, program, NULL, NULL);
1988 status = 0;
1989 } else {
1990 if (envpipe[0] >= 0) {
1991 (void) close(envpipe[1]);
1992 (*device_pipe_hook)(envpipe[0]);
1993 }
1994 while (waitpid(pid, &status, 0) < 0) {
1995 if (errno == EINTR)
1996 continue;
1997 fatal("error waiting for (dis)connection process: %m");
1998 }
1999 if (envpipe[0] >= 0)
2000 (void) close(envpipe[0]);
2001 --conn_running;
2002 }
2003
2004 return (status == 0 ? 0 : -1);
2005 }
2006
2007
2008 /*
2009 * run-program - execute a program with given arguments,
2010 * but don't wait for it.
2011 * If the program can't be executed, logs an error unless
2012 * must_exist is 0 and the program file doesn't exist.
2013 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
2014 * or isn't an executable plain file, or the process ID of the child.
2015 * If done != NULL, (*done)(arg, int) will be called later (within
2016 * reap_kids) if this routine returns value > 0.
2017 */
2018 pid_t
2019 run_program(prog, args, must_exist, done, arg)
2020 char *prog;
2021 char **args;
2022 int must_exist;
2023 void (*done) __P((void *arg, int status));
2024 void *arg;
2025 {
2026 pid_t pid;
2027 struct stat sbuf;
2028 int retv;
2029
2030 /*
2031 * First check if the file exists and is executable.
2032 * We don't use access() because that would use the
2033 * real user-id, which might not be root, and the script
2034 * might be accessible only to root.
2035 */
2036 errno = EINVAL;
2037 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
2038 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
2039 if (must_exist || errno != ENOENT)
2040 warn("Can't execute %s: %m", prog);
2041 return (0);
2042 }
2043
2044 if (updown_script_hook != NULL) {
2045 retv = (*updown_script_hook)((const char ***)&args);
2046 if (retv == -1) {
2047 return (-1);
2048 }
2049 }
2050
2051 pid = fork();
2052 if (pid == (pid_t)-1) {
2053 error("Failed to create child process for %s: %m", prog);
2054 return (-1);
2055 }
2056 if (pid == (pid_t)0) {
2057 int new_fd;
2058
2059 /* Leave the current location */
2060 (void) setsid(); /* No controlling tty. */
2061 (void) umask (S_IRWXG|S_IRWXO);
2062 (void) chdir ("/"); /* no current directory. */
2063 (void) setuid(0); /* set real UID = root */
2064 (void) setgid(getegid());
2065
2066 /* Ensure that nothing of our device environment is inherited. */
2067 sys_close();
2068 closelog();
2069 (void) close(0);
2070 (void) close(1);
2071 (void) close(2);
2072 (void) close(ttyfd); /* tty interface to the ppp device */
2073 if (real_ttyfd >= 0)
2074 (void) close(real_ttyfd);
2075
2076 /* Don't pass handles to the PPP device, even by accident. */
2077 new_fd = open (_PATH_DEVNULL, O_RDWR);
2078 if (new_fd >= 0) {
2079 if (new_fd != 0) {
2080 if (dup2(new_fd, 0) < 0) /* stdin <- /dev/null */
2081 error("dup2(/dev/null, STDIN) failed: %m");
2082 (void) close(new_fd);
2083 }
2084 if (dup2(0, 1) < 0) /* stdout -> /dev/null */
2085 error("dup2(/dev/null, STDOUT) failed: %m");
2086 if (dup2(0, 2) < 0) /* stderr -> /dev/null */
2087 error("dup2(/dev/null, STDERR) failed: %m");
2088 }
2089
2090 #ifdef BSD
2091 /* Force the priority back to zero if pppd is running higher. */
2092 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
2093 warn("can't reset priority to 0: %m");
2094 #endif
2095
2096 /* SysV recommends a second fork at this point. */
2097
2098 /* run the program */
2099 (void) execve(prog, args, script_env);
2100 if (must_exist || errno != ENOENT) {
2101 /* have to reopen the log, there's nowhere else
2102 for the message to go. */
2103 reopen_log();
2104 syslog(LOG_ERR, "Can't execute %s: %m", prog);
2105 closelog();
2106 }
2107 _exit(-1);
2108 }
2109
2110 if (debug)
2111 dbglog("Script %s started (pid %d)", prog, pid);
2112 record_child(pid, prog, done, arg);
2113
2114 return (pid);
2115 }
2116
2117
2118 /*
2119 * record_child - add a child process to the list for reap_kids
2120 * to use.
2121 */
2122 static void
2123 record_child(pid, prog, done, arg)
2124 pid_t pid;
2125 char *prog;
2126 void (*done) __P((void *, int));
2127 void *arg;
2128 {
2129 struct subprocess *chp;
2130
2131 ++n_children;
2132
2133 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
2134 if (chp == NULL) {
2135 warn("losing track of %s process", prog);
2136 } else {
2137 chp->pid = pid;
2138 chp->prog = prog;
2139 chp->done = done;
2140 chp->arg = arg;
2141 chp->next = children;
2142 children = chp;
2143 }
2144 }
2145
2146
2147 /*
2148 * reap_kids - get status from any dead child processes,
2149 * and log a message for abnormal terminations.
2150 */
2151 static int
2152 reap_kids(waitfor)
2153 int waitfor;
2154 {
2155 pid_t pid;
2156 int status, i;
2157 struct subprocess *chp, **prevp;
2158
2159 got_sigchld = 0;
2160 if (n_children == 0)
2161 return (0);
2162
2163 /*CONSTANTCONDITION*/
2164 while (1) {
2165 pid = waitpid(-1, &status, (waitfor ? 0 : WNOHANG));
2166 if (pid == 0) {
2167 break; /* return 0 */
2168 } else if (pid == -1) {
2169 if (errno == EINTR)
2170 continue;
2171 if (errno != ECHILD)
2172 error("Error waiting for child process: %m");
2173 return (-1);
2174 } else {
2175 for (prevp = &children; (chp = *prevp) != NULL;
2176 prevp = &chp->next) {
2177 if (chp->pid == pid) {
2178 --n_children;
2179 *prevp = chp->next;
2180 break;
2181 }
2182 }
2183 if (WIFSIGNALED(status) || WIFSTOPPED(status)) {
2184 i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status);
2185 warn("Child process %s (pid %d) %s with signal %d (%s)",
2186 (chp != NULL ? chp->prog : "??"), pid,
2187 (WIFSIGNALED(status) ? "terminated" : "stopped"),
2188 i, signal_name(i));
2189 } else if (debug) {
2190 dbglog("Child process %s finished (pid %d), status = %d",
2191 (chp != NULL ? chp->prog: "??"), pid,
2192 WEXITSTATUS(status));
2193 }
2194 if ((chp != NULL) && (chp->done != NULL))
2195 (*chp->done)(chp->arg, status);
2196 if (chp != NULL)
2197 free(chp);
2198 }
2199 }
2200 return (0);
2201 }
2202
2203 /*
2204 * infanticide - timeout while waiting for child process.
2205 */
2206 /*ARGSUSED*/
2207 static void
2208 infanticide(sig)
2209 int sig;
2210 {
2211 struct subprocess *chp;
2212 static int runcount = 0;
2213
2214 if (runcount < 2) {
2215 for (chp = children; chp != NULL; chp = chp->next)
2216 (void) kill(chp->pid, runcount == 0 ? SIGTERM : SIGKILL);
2217 } else {
2218 kill_my_pg(SIGTERM);
2219 /* Quit and hope for the best. */
2220 n_children = 0;
2221 }
2222 runcount++;
2223 }
2224
2225 /*
2226 * Perform final wait before exiting.
2227 */
2228 static void
2229 final_reap()
2230 {
2231 struct sigaction sa;
2232 struct subprocess *chp;
2233
2234 if (n_children > 0 && debug) {
2235 dbglog("Waiting for %d child processes...", n_children);
2236 for (chp = children; chp != NULL; chp = chp->next)
2237 dbglog(" pid %d: %s", chp->pid, chp->prog);
2238 }
2239 BZERO(&sa, sizeof (sa));
2240 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, infanticide);
2241 while (n_children > 0) {
2242 (void) alarm(7);
2243 if (reap_kids(1) < 0)
2244 break;
2245 }
2246 (void) alarm(0);
2247 }
2248
2249 /*
2250 * novm - log an error message saying we ran out of memory, and die.
2251 */
2252 void
2253 novm(msg)
2254 char *msg;
2255 {
2256 fatal("Virtual memory exhausted allocating %s\n", msg);
2257 }
2258
2259 /*
2260 * script_setenv - set an environment variable value to be used
2261 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2262 */
2263 void
2264 script_setenv(var, value, iskey)
2265 const char *var;
2266 const char *value;
2267 int iskey;
2268 {
2269 size_t varl = strlen(var);
2270 size_t vl = varl + strlen(value) + 2;
2271 int i;
2272 char *p, *newstring;
2273
2274 /*
2275 * XXX: Can we assert that a tdb write lock is held here ? It appears that
2276 * Linux's use of tdb is not safe.
2277 */
2278 newstring = (char *) malloc(vl+1);
2279 if (newstring == NULL) {
2280 novm("script environment string");
2281 return;
2282 }
2283 *newstring++ = iskey;
2284 (void) slprintf(newstring, vl, "%s=%s", var, value);
2285
2286 /* check if this variable is already set */
2287 if (script_env != NULL) {
2288 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2289 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2290 #ifdef HAVE_MULTILINK
2291 if (p[-1] != '\0' && pppdb != NULL)
2292 delete_db_key(p);
2293 #endif
2294 free(p-1);
2295 script_env[i] = newstring;
2296 #ifdef HAVE_MULTILINK
2297 if (iskey && pppdb != NULL)
2298 add_db_key(newstring);
2299 update_db_entry();
2300 #endif
2301 return;
2302 }
2303 }
2304 } else {
2305 /* no space allocated for script env. ptrs. yet */
2306 i = 0;
2307 script_env = (char **) malloc(16 * sizeof(char *));
2308 if (script_env == NULL) {
2309 novm("script environment variable.");
2310 return;
2311 }
2312 s_env_nalloc = 16;
2313 }
2314
2315 /* reallocate script_env with more space if needed */
2316 if (i + 1 >= s_env_nalloc) {
2317 int new_n = i + 17;
2318 char **newenv = (char **) realloc((void *)script_env,
2319 new_n * sizeof(char *));
2320 if (newenv == NULL) {
2321 novm("expanded script environment variable.");
2322 return;
2323 }
2324 script_env = newenv;
2325 s_env_nalloc = new_n;
2326 }
2327
2328 script_env[i] = newstring;
2329 script_env[i+1] = NULL;
2330
2331 #ifdef HAVE_MULTILINK
2332 if (pppdb != NULL) {
2333 if (iskey)
2334 add_db_key(newstring);
2335 update_db_entry();
2336 }
2337 #endif
2338 }
2339
2340 /*
2341 * script_unsetenv - remove a variable from the environment
2342 * for scripts.
2343 */
2344 void
2345 script_unsetenv(var)
2346 const char *var;
2347 {
2348 int vl = strlen(var);
2349 int i;
2350 char *p;
2351
2352 /*
2353 * XXX: Can we assert that a tdb write lock is held here ? It appears that
2354 * Linux's use of tdb is not safe.
2355 */
2356 if (script_env == NULL)
2357 return;
2358 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2359 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2360 #ifdef HAVE_MULTILINK
2361 if (p[-1] != '\0' && pppdb != NULL)
2362 delete_db_key(p);
2363 #endif
2364 free(p-1);
2365 while ((script_env[i] = script_env[i+1]) != NULL)
2366 ++i;
2367 break;
2368 }
2369 }
2370 #ifdef HAVE_MULTILINK
2371 if ((pppdb != NULL) && (p != NULL))
2372 update_db_entry();
2373 #endif
2374 }
2375
2376 /*
2377 * script_getenv - find a variable in the script environment.
2378 */
2379 const char *
2380 script_getenv(var)
2381 const char *var;
2382 {
2383 int vl = strlen(var);
2384 int i;
2385 char *p;
2386
2387 if (script_env == NULL)
2388 return (NULL);
2389 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2390 if (strncmp(p, var, vl) == 0 && p[vl] == '=')
2391 return ((const char *)p+vl+1);
2392 }
2393 return (NULL);
2394 }
2395
2396 #ifdef HAVE_MULTILINK
2397 /*
2398 * update_db_entry - update our entry in the database.
2399 */
2400 static void
2401 update_db_entry()
2402 {
2403 TDB_DATA key, dbuf;
2404 int vlen, i;
2405 char *p, *q, *vbuf;
2406
2407 if (script_env == NULL)
2408 return;
2409 /*
2410 * vlen needs to be initialized as 1, or otherwise, the last string
2411 * is truncated by slprintf.
2412 */
2413 vlen = 1;
2414 for (i = 0; (p = script_env[i]) != NULL; ++i)
2415 vlen += strlen(p) + 1;
2416 vbuf = malloc(vlen);
2417 if (vbuf == NULL)
2418 novm("database entry");
2419 q = vbuf;
2420 for (i = 0; (p = script_env[i]) != NULL; ++i)
2421 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2422
2423 key.dptr = db_key;
2424 key.dsize = strlen(db_key);
2425 dbuf.dptr = vbuf;
2426 dbuf.dsize = vlen;
2427 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2428 error("tdb_store failed: %s", tdb_error(pppdb));
2429 }
2430
2431 /*
2432 * add_db_key - add a key that we can use to look up our database entry.
2433 */
2434 static void
2435 add_db_key(str)
2436 const char *str;
2437 {
2438 TDB_DATA key, dbuf;
2439
2440 key.dptr = (char *) str;
2441 key.dsize = strlen(str);
2442 dbuf.dptr = db_key;
2443 dbuf.dsize = strlen(db_key);
2444 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2445 error("tdb_store key failed: %s", tdb_error(pppdb));
2446 }
2447
2448 /*
2449 * delete_db_key - delete a key for looking up our database entry.
2450 */
2451 static void
2452 delete_db_key(str)
2453 const char *str;
2454 {
2455 TDB_DATA key;
2456
2457 key.dptr = (char *) str;
2458 key.dsize = strlen(str);
2459 (void) tdb_delete(pppdb, key);
2460 }
2461
2462 /*
2463 * cleanup_db - delete all the entries we put in the database.
2464 */
2465 static void
2466 cleanup_db()
2467 {
2468 TDB_DATA key;
2469 int i;
2470 char *p;
2471
2472 key.dptr = db_key;
2473 key.dsize = strlen(db_key);
2474 (void) tdb_delete(pppdb, key);
2475 for (i = 0; (p = script_env[i]) != NULL; ++i)
2476 if (p[-1] != '\0')
2477 delete_db_key(p);
2478 }
2479 #endif /* HAVE_MULTILINK */
2480
2481 /*
2482 * open_socket - establish a stream socket connection to the nominated
2483 * host and port.
2484 * XXX: Need IPv6 support for those systems that support it (use getaddrinfo),
2485 * but requires portability changes.
2486 */
2487 static int
2488 open_socket(dest)
2489 char *dest;
2490 {
2491 char *sep, *endp = NULL;
2492 int sock;
2493 int port = -1;
2494 u_int32_t host;
2495 struct hostent *hent = NULL;
2496 struct sockaddr_in sad;
2497 struct servent *se;
2498
2499 /* parse host:port and resolve host to an IP address */
2500 sep = strchr(dest, ':');
2501 if (sep != NULL) {
2502 se = getservbyname((const char *)sep+1, "tcp");
2503 if (se != NULL) {
2504 port = ntohs(se->s_port);
2505 } else {
2506 port = strtol(sep+1, &endp, 10);
2507 if (endp == sep+1 || *endp != '\0') {
2508 error("Can't parse host:port for socket destination");
2509 return (-1);
2510 }
2511 }
2512 }
2513 if (port < 0 || port > 65535 || sep == dest) {
2514 error("Can't parse host:port for socket destination");
2515 return (-1);
2516 }
2517 *sep = '\0';
2518 host = inet_addr(dest);
2519 if (host == (u_int32_t) -1) {
2520 hent = gethostbyname(dest);
2521 if (hent == NULL) {
2522 error("%s: unknown host in socket option", dest);
2523 *sep = ':';
2524 return (-1);
2525 }
2526 BCOPY(hent->h_addr_list[0], &host, sizeof(host));
2527 hent->h_addr_list++;
2528 }
2529 *sep = ':';
2530
2531 for (;;) {
2532 /* get a socket and connect it to the other end */
2533 sock = socket(PF_INET, SOCK_STREAM, 0);
2534 if (sock < 0) {
2535 error("Can't create socket: %m");
2536 return (-1);
2537 }
2538 BZERO(&sad, sizeof(sad));
2539 sad.sin_family = AF_INET;
2540 sad.sin_port = htons(port);
2541 sad.sin_addr.s_addr = host;
2542 if (connect(sock, (struct sockaddr *)&sad, sizeof(sad)) >= 0) {
2543 break; /* return sock file descriptor */
2544 }
2545 if ((hent != NULL) && (hent->h_addr_list != NULL)) {
2546 BCOPY(hent->h_addr_list[0], &host, sizeof(host));
2547 hent->h_addr_list++;
2548 (void) close(sock);
2549 continue;
2550 }
2551 error("Can't connect to %s: %m", dest);
2552 (void) close(sock);
2553 return (-1);
2554 }
2555 return (sock);
2556 }
2557
2558 /*
2559 * print_ncpstate - prints out current NCP state.
2560 *
2561 * We're normally called from SIGUSR1 here, but this is safe because
2562 * these signals are blocked unless we're idle waiting for events.
2563 * There's no need to otherwise lock the data structures referenced.
2564 */
2565 void
2566 print_ncpstate(unit, strptr)
2567 int unit;
2568 FILE *strptr;
2569 {
2570 struct protent *protp;
2571 int i;
2572
2573 (void) flprintf(strptr, "In %s phase\n", phase_name(phase));
2574 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
2575 if (protp->print_stat != NULL)
2576 (*protp->print_stat)(unit, strptr);
2577 }
2578 sys_print_state(strptr);
2579 }
2580
2581 /*
2582 * start_charshunt - create a child process to run the character shunt.
2583 */
2584 static int
2585 start_charshunt(ifd, ofd)
2586 int ifd, ofd;
2587 {
2588 pid_t cpid;
2589
2590 cpid = fork();
2591 if (cpid == (pid_t)-1) {
2592 error("Can't fork process for character shunt: %m");
2593 return (0);
2594 }
2595 if (cpid == (pid_t)0) {
2596 /* child */
2597 (void) close(pty_slave);
2598 pty_slave = -1;
2599 (void) setgid(getgid());
2600 (void) setuid(uid);
2601 if (getuid() != uid)
2602 fatal("setuid failed");
2603 if (!nodetach)
2604 log_to_fd = -1;
2605 charshunt(ifd, ofd, record_file);
2606 exit(0);
2607 }
2608 charshunt_pid = cpid;
2609 (void) close(pty_master);
2610 pty_master = -1;
2611 ttyfd = pty_slave;
2612 record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
2613 return (1);
2614 }
2615
2616 /*ARGSUSED*/
2617 static void
2618 charshunt_done(arg, status)
2619 void *arg;
2620 int status;
2621 {
2622 charshunt_pid = (pid_t)0;
2623 }
2624
2625 static void
2626 reportme(int signo)
2627 {
2628 dbglog("charshunt taking signal %d", signo);
2629 exit(1);
2630 }
2631
2632 /*
2633 * charshunt - the character shunt, which passes characters between
2634 * the pty master side and the serial port (or stdin/stdout).
2635 * This runs as the user (not as root).
2636 * (We assume ofd >= ifd which is true the way this gets called. :-).
2637 */
2638 static void
2639 charshunt(ifd, ofd, record_file)
2640 int ifd, ofd;
2641 char *record_file;
2642 {
2643 int n, nfds;
2644 fd_set ready, writey;
2645 u_char *ibufp, *obufp;
2646 int nibuf, nobuf;
2647 int flags;
2648 struct timeval lasttime;
2649 FILE *recordf = NULL;
2650 int ilevel, olevel, max_level;
2651 struct timeval levelt, tout, *top;
2652
2653 /*
2654 * Reset signal handlers.
2655 */
2656 (void) signal(SIGHUP, SIG_IGN); /* Hangup */
2657 (void) signal(SIGINT, reportme); /* Interrupt */
2658 (void) signal(SIGTERM, reportme); /* Terminate */
2659 (void) signal(SIGCHLD, reportme);
2660 (void) signal(SIGUSR1, reportme);
2661 (void) signal(SIGUSR2, reportme);
2662 (void) signal(SIGABRT, reportme);
2663 (void) signal(SIGALRM, reportme);
2664 (void) signal(SIGFPE, reportme);
2665 (void) signal(SIGILL, reportme);
2666 (void) signal(SIGPIPE, reportme);
2667 (void) signal(SIGQUIT, reportme);
2668 #ifndef DEBUG
2669 (void) signal(SIGSEGV, reportme);
2670 #endif
2671 #ifdef SIGBUS
2672 (void) signal(SIGBUS, reportme);
2673 #endif
2674 #ifdef SIGEMT
2675 (void) signal(SIGEMT, reportme);
2676 #endif
2677 #ifdef SIGPOLL
2678 (void) signal(SIGPOLL, reportme);
2679 #endif
2680 #ifdef SIGPROF
2681 (void) signal(SIGPROF, reportme);
2682 #endif
2683 #ifdef SIGSYS
2684 (void) signal(SIGSYS, reportme);
2685 #endif
2686 #ifdef SIGTRAP
2687 (void) signal(SIGTRAP, reportme);
2688 #endif
2689 #ifdef SIGVTALRM
2690 (void) signal(SIGVTALRM, reportme);
2691 #endif
2692 #ifdef SIGXCPU
2693 (void) signal(SIGXCPU, reportme);
2694 #endif
2695 #ifdef SIGXFSZ
2696 (void) signal(SIGXFSZ, reportme);
2697 #endif
2698
2699 /*
2700 * Open the record file if required.
2701 */
2702 if (record_file != NULL) {
2703 recordf = fopen(record_file, "a");
2704 if (recordf == NULL)
2705 error("Couldn't create record file %s: %m", record_file);
2706 }
2707
2708 /* set all the fds to non-blocking mode */
2709 flags = fcntl(pty_master, F_GETFL);
2710 if (flags == -1
2711 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
2712 warn("couldn't set pty master to nonblock: %m");
2713 flags = fcntl(ifd, F_GETFL);
2714 if (flags == -1
2715 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
2716 warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
2717 if (ofd != ifd) {
2718 flags = fcntl(ofd, F_GETFL);
2719 if (flags == -1
2720 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
2721 warn("couldn't set stdout to nonblock: %m");
2722 }
2723
2724 nibuf = nobuf = 0;
2725 ibufp = obufp = NULL;
2726
2727 ilevel = olevel = 0;
2728 (void) gettimeofday(&levelt, NULL);
2729 if (max_data_rate) {
2730 max_level = max_data_rate / 10;
2731 if (max_level < MAXLEVELMINSIZE)
2732 max_level = MAXLEVELMINSIZE;
2733 } else
2734 max_level = sizeof(inpacket_buf) + 1;
2735
2736 nfds = (ofd > pty_master? ofd: pty_master) + 1;
2737 if (recordf != NULL) {
2738 (void) gettimeofday(&lasttime, NULL);
2739 (void) putc(RECMARK_TIMESTART, recordf); /* put start marker */
2740 (void) putc(lasttime.tv_sec >> 24, recordf);
2741 (void) putc(lasttime.tv_sec >> 16, recordf);
2742 (void) putc(lasttime.tv_sec >> 8, recordf);
2743 (void) putc(lasttime.tv_sec, recordf);
2744 lasttime.tv_usec = 0;
2745 }
2746
2747 while (nibuf != 0 || nobuf != 0 || ofd >= 0 || pty_master >= 0) {
2748 top = 0;
2749 tout.tv_sec = 0;
2750 tout.tv_usec = 10000;
2751 FD_ZERO(&ready);
2752 FD_ZERO(&writey);
2753 if (nibuf != 0) {
2754 if (ilevel >= max_level)
2755 top = &tout;
2756 else if (pty_master >= 0)
2757 FD_SET(pty_master, &writey);
2758 } else if (ifd >= 0)
2759 FD_SET(ifd, &ready);
2760 if (nobuf != 0) {
2761 if (olevel >= max_level)
2762 top = &tout;
2763 else if (ofd >= 0)
2764 FD_SET(ofd, &writey);
2765 } else {
2766 /* Don't read from pty if it's gone or it has closed. */
2767 if (pty_master >= 0 && ofd >= 0)
2768 FD_SET(pty_master, &ready);
2769 }
2770 if (select(nfds, &ready, &writey, NULL, top) < 0) {
2771 if (errno != EINTR)
2772 fatal("select");
2773 continue;
2774 }
2775 if (max_data_rate) {
2776 double dt;
2777 int nbt;
2778 struct timeval now;
2779
2780 (void) gettimeofday(&now, NULL);
2781 dt = (now.tv_sec - levelt.tv_sec
2782 + (now.tv_usec - levelt.tv_usec) / 1e6);
2783 nbt = (int)(dt * max_data_rate);
2784 ilevel = (nbt < 0 || nbt > ilevel)? 0: ilevel - nbt;
2785 olevel = (nbt < 0 || nbt > olevel)? 0: olevel - nbt;
2786 levelt = now;
2787 } else
2788 ilevel = olevel = 0;
2789 if (FD_ISSET(ifd, &ready)) {
2790 ibufp = inpacket_buf;
2791 nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
2792 if (nibuf < 0 && errno == EIO)
2793 nibuf = 0;
2794 if (nibuf < 0 || pty_master == -1) {
2795 if (errno != EINTR && errno != EAGAIN) {
2796 error("Error reading standard input: %m");
2797 break;
2798 }
2799 nibuf = 0;
2800 } else if (nibuf == 0) {
2801 /* end of file from stdin */
2802 (void) close(pty_master);
2803 pty_master = -1;
2804 (void) close(ifd);
2805 ifd = -1;
2806 if (recordf)
2807 if (!record_write(recordf, RECMARK_ENDRECV, NULL, 0,
2808 &lasttime))
2809 recordf = NULL;
2810 } else {
2811 FD_SET(pty_master, &writey);
2812 if (recordf)
2813 if (!record_write(recordf, RECMARK_STARTRECV, ibufp, nibuf,
2814 &lasttime))
2815 recordf = NULL;
2816 }
2817 }
2818 if (ofd >= 0 && pty_master >= 0 && FD_ISSET(pty_master, &ready)) {
2819 obufp = outpacket_buf;
2820 nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
2821 if (nobuf < 0 && errno == EIO)
2822 nobuf = 0;
2823 if (nobuf < 0 || ofd == -1) {
2824 if (!(errno == EINTR || errno == EAGAIN)) {
2825 error("Error reading pseudo-tty master: %m");
2826 break;
2827 }
2828 nobuf = 0;
2829 } else if (nobuf == 0) {
2830 /* end of file from the pty - slave side has closed */
2831 nibuf = 0;
2832 (void) close(ofd);
2833 ofd = -1;
2834 if (recordf)
2835 if (!record_write(recordf, RECMARK_ENDSEND, NULL, 0,
2836 &lasttime))
2837 recordf = NULL;
2838 } else {
2839 FD_SET(ofd, &writey);
2840 if (recordf)
2841 if (!record_write(recordf, RECMARK_STARTSEND, obufp, nobuf,
2842 &lasttime))
2843 recordf = NULL;
2844 }
2845 }
2846 if (ofd == -1)
2847 nobuf = 0;
2848 else if (FD_ISSET(ofd, &writey)) {
2849 n = nobuf;
2850 if (olevel + n > max_level)
2851 n = max_level - olevel;
2852 n = write(ofd, obufp, n);
2853 if (n < 0) {
2854 if (errno == EIO) {
2855 (void) close(ofd);
2856 ofd = -1;
2857 nobuf = 0;
2858 } else if (errno != EAGAIN && errno != EINTR) {
2859 error("Error writing standard output: %m");
2860 break;
2861 }
2862 } else {
2863 obufp += n;
2864 nobuf -= n;
2865 olevel += n;
2866 }
2867 }
2868 if (pty_master == -1)
2869 nibuf = 0;
2870 else if (FD_ISSET(pty_master, &writey)) {
2871 n = nibuf;
2872 if (ilevel + n > max_level)
2873 n = max_level - ilevel;
2874 n = write(pty_master, ibufp, n);
2875 if (n < 0) {
2876 if (errno == EAGAIN || errno == EINTR)
2877 continue;
2878 if (errno != EIO) {
2879 error("Error writing pseudo-tty master: %m");
2880 break;
2881 }
2882 (void) close(pty_master);
2883 pty_master = -1;
2884 nibuf = 0;
2885 } else {
2886 ibufp += n;
2887 nibuf -= n;
2888 ilevel += n;
2889 }
2890 }
2891 }
2892 exit(0);
2893 }
2894
2895 static int
2896 record_write(f, code, buf, nb, tp)
2897 FILE *f;
2898 int code;
2899 u_char *buf;
2900 int nb;
2901 struct timeval *tp;
2902 {
2903 struct timeval now;
2904 int diff;
2905
2906 (void) gettimeofday(&now, NULL);
2907 now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
2908 diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
2909 if (diff > 0) {
2910 if (diff > 255) {
2911 (void) putc(RECMARK_TIMEDELTA32, f);
2912 (void) putc(diff >> 24, f);
2913 (void) putc(diff >> 16, f);
2914 (void) putc(diff >> 8, f);
2915 (void) putc(diff, f);
2916 } else {
2917 (void) putc(RECMARK_TIMEDELTA8, f);
2918 (void) putc(diff, f);
2919 }
2920 *tp = now;
2921 }
2922 (void) putc(code, f);
2923 if (buf != NULL) {
2924 (void) putc(nb >> 8, f);
2925 (void) putc(nb, f);
2926 (void) fwrite(buf, nb, 1, f);
2927 }
2928 (void) fflush(f);
2929 if (ferror(f)) {
2930 error("Error writing record file: %m");
2931 return (0);
2932 }
2933 return (1);
2934 }