1 /*
2 * main.c - Point-to-Point Protocol main module
3 *
4 * Copyright 2009 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 * Copyright (c) 2016 by Delphix. All rights reserved.
35 */
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 /* interface vars */
88 char ifname[32]; /* Interface name */
89 int ifunit = -1; /* Interface unit number */
90
91 char *progname; /* Name of this program */
92 char hostname[MAXHOSTNAMELEN+1]; /* Our hostname */
93 static char pidfilename[MAXPATHLEN]; /* name of pid file */
94 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
95 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
96 static uid_t uid; /* Our real user-id */
97 static int conn_running; /* we have a [dis]connector running */
98
99 int ttyfd; /* Serial port file descriptor */
100 mode_t tty_mode = (mode_t)-1; /* Original access permissions to tty */
101 int baud_rate; /* Actual bits/second for serial device */
102 bool hungup; /* terminal has been hung up */
103 bool privileged; /* we're running as real uid root */
104 bool need_holdoff; /* need holdoff period before restarting */
105 bool detached; /* have detached from terminal */
106 struct stat devstat; /* result of stat() on devnam */
107 bool prepass = 0; /* doing prepass to find device name */
108 int devnam_fixed; /* set while in options.ttyxx file */
109 volatile int status; /* exit status for pppd */
110 int unsuccess; /* # unsuccessful connection attempts */
111 int do_callback; /* != 0 if we should do callback next */
112 int doing_callback; /* != 0 if we are doing callback */
113 char *callback_script; /* script for doing callback */
114 #ifdef HAVE_MULTILINK
115 TDB_CONTEXT *pppdb; /* database for storing status etc. */
116 char db_key[32];
117 #endif
118
119 /*
120 * For plug-in usage:
121 *
122 * holdoff_hook - Can be used to change the demand-dial hold-off
123 * time dynamically. This is normally set by the
124 * "holdoff" option, and is 30 seconds by default.
125 *
126 * new_phase_hook - This is called for each change in the PPP
127 * phase (per RFC 1661). This can be used to log
128 * progress.
129 *
130 * check_options_hook - This is called before doing sys_init()
131 * and allows the plugin to verify the selected options.
132 *
133 * updown_script_hook - This is called with the proposed
134 * command-line arguments for any of the
135 * /etc/ppp/{ip,ipv6,ipx,auth}-{up,down} scripts before
136 * fork/exec. It can be used to add or change arguments.
137 *
138 * device_pipe_hook - If this is set, then an extra fd (3) is
139 * passed to the connect/disconnect script. This extra
140 * fd is the write side of a pipe, and the read side is
141 * passed to this routine. This can be used to pass
142 * arbitrary data from the script back to pppd.
143 */
144 int (*holdoff_hook) __P((void)) = NULL;
145 int (*new_phase_hook) __P((int new, int old)) = NULL;
146 int (*check_options_hook) __P((uid_t uid)) = NULL;
147 int (*updown_script_hook) __P((const char ***argsp)) = NULL;
148 void (*device_pipe_hook) __P((int pipefd)) = NULL;
149
150 static int fd_ppp = -1; /* fd for talking PPP */
151 static int fd_loop; /* fd for getting demand-dial packets */
152 static int pty_master; /* fd for master side of pty */
153 int pty_slave = -1; /* fd for slave side of pty */
154 static int real_ttyfd; /* fd for actual serial port (not pty) */
155
156 int phase; /* where the link is at */
157 int kill_link;
158 int open_ccp_flag;
159
160 static int waiting; /* for input from peer or timer expiration */
161 static sigjmp_buf sigjmp;
162
163 char **script_env; /* Env. variable values for scripts */
164 int s_env_nalloc; /* # words avail at script_env */
165
166 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
167 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
168 u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
169
170 static int n_children; /* # child processes still running */
171 static bool got_sigchld; /* set if we have received a SIGCHLD */
172 static sigset_t main_sigmask; /* signals blocked while dispatching */
173
174 static bool locked; /* lock() has succeeded */
175 static bool privopen; /* don't lock, open device as root */
176
177 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
178
179 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
180 int ngroups; /* How many groups valid in groups */
181
182 static struct timeval start_time; /* Time when link was started. */
183
184 struct pppd_stats link_stats;
185 int link_connect_time;
186 bool link_stats_valid;
187
188 static pid_t charshunt_pid; /* Process ID for charshunt */
189
190 extern option_t general_options[];
191 extern option_t auth_options[];
192
193 /*
194 * We maintain a list of child process pids and
195 * functions to call when they exit.
196 */
197 struct subprocess {
198 pid_t pid;
199 char *prog;
200 void (*done) __P((void *, int));
201 void *arg;
202 struct subprocess *next;
203 };
204
205 static struct subprocess *children;
206
207 /* Prototypes for procedures local to this file. */
208
209 static void setup_signals __P((void));
210 static void create_pidfile __P((void));
211 static void create_linkpidfile __P((void));
212 static void cleanup __P((void));
213 static void close_tty __P((void));
214 static void get_input __P((void));
215 static void calltimeout __P((void));
216 static struct timeval *timeleft __P((struct timeval *));
217 static void kill_my_pg __P((int));
218 static void hup __P((int));
219 static void term __P((int));
220 static void chld __P((int));
221 static void toggle_debug __P((int));
222 static void open_ccp __P((int));
223 static void bad_signal __P((int));
224 static void holdoff_end __P((void *));
225 static int device_script __P((char *, int, int, int, char *));
226 static int reap_kids __P((int waitfor));
227 static void record_child __P((pid_t, char *, void (*) (void *, int), void *));
228 static int open_socket __P((char *));
229 static int start_charshunt __P((int, int));
230 static void charshunt_done __P((void *, int));
231 static void charshunt __P((int, int, char *));
232 static int record_write __P((FILE *, int code, u_char *buf, int nb,
233 struct timeval *));
234 static void final_reap __P((void));
235
236 #ifdef HAVE_MULTILINK
237 static void update_db_entry __P((void));
238 static void add_db_key __P((const char *));
239 static void delete_db_key __P((const char *));
240 static void cleanup_db __P((void));
241 #endif
242
243 int main __P((int, char *[]));
244
245 #ifdef ultrix
246 #undef O_NONBLOCK
247 #define O_NONBLOCK O_NDELAY
248 #endif
249
250 #ifdef ULTRIX
251 #define setlogmask(x) 0
252 #endif
253
254 /* Backward compatibility for Linux */
255 #ifndef RECMARK_TIMESTART
256 #define RECMARK_STARTSEND 1
257 #define RECMARK_STARTRECV 2
258 #define RECMARK_ENDSEND 3
259 #define RECMARK_ENDRECV 4
260 #define RECMARK_TIMEDELTA32 5
261 #define RECMARK_TIMEDELTA8 6
262 #define RECMARK_TIMESTART 7
263 #endif
264
265 /*
266 * PPP Data Link Layer "protocol" table.
267 * One entry per supported protocol.
268 * The last entry must be NULL.
269 */
270 struct protent *protocols[] = {
271 &lcp_protent,
272 &pap_protent,
273 &chap_protent,
274 #ifdef CBCP_SUPPORT
275 &cbcp_protent,
276 #endif
277 &ipcp_protent,
278 #ifdef INET6
279 &ipv6cp_protent,
280 #endif
281 &ccp_protent,
282 #ifdef IPX_CHANGE
283 &ipxcp_protent,
284 #endif
285 #ifdef AT_CHANGE
286 &atcp_protent,
287 #endif
288 NULL
289 };
290
291 int
main(argc,argv)292 main(argc, argv)
293 int argc;
294 char *argv[];
295 {
296 int i, fdflags, t;
297 char *p, *connector;
298 struct passwd *pw;
299 struct timeval timo;
300 struct protent *protp;
301 struct stat statbuf;
302 char numbuf[16];
303
304 ifname[0] = '\0';
305 new_phase(PHASE_INITIALIZE);
306
307 /*
308 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
309 * This way we can close 0, 1, 2 in detach() without clobbering
310 * a fd that we are using.
311 */
312 if ((i = open(_PATH_DEVNULL, O_RDWR)) >= 0) {
313 while (0 <= i && i <= 2)
314 i = dup(i);
315 if (i >= 0)
316 (void) close(i);
317 }
318
319 script_env = NULL;
320
321 /* Initialize syslog facilities */
322 reopen_log();
323
324 if (gethostname(hostname, MAXHOSTNAMELEN+1) < 0 ) {
325 option_error("Couldn't get hostname: %m");
326 exit(1);
327 }
328 hostname[MAXHOSTNAMELEN] = '\0';
329
330 /* make sure we don't create world or group writable files. */
331 (void) umask(umask(0777) | 022);
332
333 uid = getuid();
334 privileged = (uid == 0);
335 (void) slprintf(numbuf, sizeof(numbuf), "%d", uid);
336 script_setenv("ORIG_UID", numbuf, 0);
337
338 ngroups = getgroups(NGROUPS_MAX, groups);
339
340 /*
341 * Initialize magic number generator now so that protocols may
342 * use magic numbers in initialization.
343 */
344 magic_init();
345
346 progname = *argv;
347 prepass = 0;
348 /*
349 * Initialize to the standard option set, then parse, in order, the
350 * system options file, the user's options file, the tty's options file,
351 * and the command line arguments. At last, install the options declared
352 * by each protocol into the extra_option list.
353 */
354 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
355 (*protp->init)(0);
356 if (protp->options != NULL) {
357 add_options(protp->options);
358 }
359 }
360
361 /*
362 * Install "generic" options into the extra_options list.
363 */
364 add_options(auth_options);
365 add_options(general_options);
366
367 /* Install any system-specific options (or remove unusable ones) */
368 sys_options();
369
370 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
371 || !options_from_user())
372 exit(EXIT_OPTION_ERROR);
373
374 /* scan command line and options files to find device name */
375 prepass = 1;
376 (void) parse_args(argc-1, argv+1);
377 prepass = 0;
378
379 /*
380 * Work out the device name, if it hasn't already been specified.
381 */
382 using_pty = notty || ptycommand != NULL || pty_socket != NULL;
383 if (!using_pty && default_device && !direct_tty) {
384 char *p;
385
386 if (!isatty(0) || (p = ttyname(0)) == NULL) {
387 option_error("no device specified and stdin is not a tty");
388 exit(EXIT_OPTION_ERROR);
389 }
390 (void) strlcpy(devnam, p, sizeof(devnam));
391 if (stat(devnam, &devstat) < 0)
392 fatal("Couldn't stat default device %s: %m", devnam);
393 }
394
395 /*
396 * Parse the tty options file and the command line.
397 * The per-tty options file should not change
398 * ptycommand, pty_socket, notty or devnam.
399 */
400 devnam_fixed = 1;
401 if (!using_pty && !direct_tty) {
402 if (!options_for_tty())
403 exit(EXIT_OPTION_ERROR);
404 }
405
406 devnam_fixed = 0;
407 if (!parse_args(argc-1, argv+1))
408 exit(EXIT_OPTION_ERROR);
409
410 /*
411 * Check that we are running as root.
412 */
413 if (geteuid() != 0) {
414 option_error("must be root to run %s, since it is not setuid-root",
415 argv[0]);
416 exit(EXIT_NOT_ROOT);
417 }
418
419 if (!ppp_available()) {
420 option_error(no_ppp_msg);
421 exit(EXIT_NO_KERNEL_SUPPORT);
422 }
423
424 /*
425 * Check that the options given are valid and consistent.
426 */
427 if (!sys_check_options())
428 exit(EXIT_OPTION_ERROR);
429 auth_check_options();
430 #ifdef HAVE_MULTILINK
431 mp_check_options();
432 #endif
433 for (i = 0; (protp = protocols[i]) != NULL; ++i)
434 if (protp->enabled_flag && protp->check_options != NULL)
435 (*protp->check_options)();
436 if (demand && (connect_script == NULL)) {
437 option_error("connect script is required for demand-dialling\n");
438 exit(EXIT_OPTION_ERROR);
439 }
440 if (updetach && (nodetach || demand)) {
441 option_error("updetach cannot be used with %s",
442 nodetach ? "nodetach" : "demand");
443 exit(EXIT_OPTION_ERROR);
444 }
445 /* default holdoff to 0 if no connect script has been given */
446 if ((connect_script == NULL) && !holdoff_specified)
447 holdoff = 0;
448
449 if (using_pty || direct_tty) {
450 if (!default_device) {
451 option_error("%s option precludes specifying device name",
452 notty? "notty": "pty");
453 exit(EXIT_OPTION_ERROR);
454 }
455 if (ptycommand != NULL && (notty || direct_tty)) {
456 option_error("pty option is incompatible with notty option");
457 exit(EXIT_OPTION_ERROR);
458 }
459 if (pty_socket != NULL && (ptycommand != NULL || notty ||
460 direct_tty)) {
461 option_error("socket option is incompatible with pty and notty");
462 exit(EXIT_OPTION_ERROR);
463 }
464 default_device = notty || direct_tty;
465 lockflag = 0;
466 modem = 0;
467 if (default_device && log_to_fd <= 1)
468 log_to_fd = -1;
469 } else {
470 /*
471 * If the user has specified a device which is the same as
472 * the one on stdin, pretend they didn't specify any.
473 * If the device is already open read/write on stdin,
474 * we assume we don't need to lock it, and we can open it as root.
475 */
476 if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
477 && statbuf.st_rdev == devstat.st_rdev) {
478 default_device = 1;
479 fdflags = fcntl(0, F_GETFL);
480 if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
481 privopen = 1;
482 }
483 }
484 if (default_device)
485 nodetach = 1;
486
487 /*
488 * Don't send log messages to the serial port, it tends to
489 * confuse the peer. :-)
490 */
491 if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
492 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
493 log_to_fd = -1;
494 early_log = 0;
495
496 if (debug)
497 (void) setlogmask(LOG_UPTO(LOG_DEBUG));
498
499 /*
500 * Initialize system-dependent stuff.
501 */
502 if (check_options_hook != NULL &&
503 (*check_options_hook)(uid) == -1) {
504 exit(EXIT_OPTION_ERROR);
505 }
506 sys_init(!devnam_info.priv && !privopen);
507
508 #ifdef HAVE_MULTILINK
509 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
510 if (pppdb != NULL) {
511 (void) slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
512 update_db_entry();
513 } else {
514 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
515 if (multilink) {
516 warn("Warning: disabling multilink");
517 multilink = 0;
518 }
519 }
520 #endif
521
522 /*
523 * Detach ourselves from the terminal, if required, and identify
524 * who is running us. Printing to stderr stops here unless
525 * nodetach or updetach is set.
526 */
527 if (!nodetach && !updetach)
528 detach();
529 p = getlogin();
530 if (p == NULL) {
531 pw = getpwuid(uid);
532 if (pw != NULL && pw->pw_name != NULL)
533 p = pw->pw_name;
534 else
535 p = "(unknown)";
536 }
537 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
538 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
539 script_setenv("PPPLOGNAME", p, 0);
540
541 if (devnam[0] != '\0')
542 script_setenv("DEVICE", devnam, 1);
543 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid());
544 script_setenv("PPPD_PID", numbuf, 1);
545
546 setup_signals();
547
548 waiting = 0;
549
550 create_linkpidfile();
551
552 /*
553 * If we're doing dial-on-demand, set up the interface now.
554 */
555 if (demand) {
556 /*
557 * Open the loopback channel and set it up to be the ppp interface.
558 */
559 #ifdef HAVE_MULTILINK
560 (void) tdb_writelock(pppdb);
561 #endif
562 set_ifunit(1);
563 fd_loop = open_ppp_loopback();
564 #ifdef HAVE_MULTILINK
565 (void) tdb_writeunlock(pppdb);
566 #endif
567
568 /*
569 * Configure the interface and mark it up, etc.
570 */
571 demand_conf();
572 }
573
574 new_phase(PHASE_INITIALIZED);
575 do_callback = 0;
576 for (;;) {
577
578 need_holdoff = 1;
579 ttyfd = -1;
580 real_ttyfd = -1;
581 status = EXIT_OK;
582 ++unsuccess;
583 doing_callback = do_callback;
584 do_callback = 0;
585
586 if (demand && !doing_callback) {
587 /*
588 * Don't do anything until we see some activity.
589 */
590 kill_link = 0;
591 new_phase(PHASE_DORMANT);
592 demand_unblock();
593 add_fd(fd_loop);
594 for (;;) {
595 if (sigsetjmp(sigjmp, 1) == 0) {
596 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
597 if (kill_link || got_sigchld) {
598 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
599 } else {
600 waiting = 1;
601 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
602 wait_input(timeleft(&timo));
603 }
604 }
605 waiting = 0;
606 calltimeout();
607 if (kill_link) {
608 if (!persist)
609 break;
610 kill_link = 0;
611 }
612 if (get_loop_output())
613 break;
614 if (got_sigchld)
615 (void) reap_kids(0);
616 }
617 remove_fd(fd_loop);
618 if (kill_link && !persist)
619 break;
620
621 /*
622 * Now we want to bring up the link.
623 */
624 demand_block();
625 info("Starting link");
626 }
627
628 new_phase(doing_callback ? PHASE_CALLINGBACK : PHASE_SERIALCONN);
629
630 /*
631 * Get a pty master/slave pair if the pty, notty, socket,
632 * or record options were specified.
633 */
634 (void) strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
635 pty_master = -1;
636 pty_slave = -1;
637 if (using_pty || record_file != NULL) {
638 if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) {
639 error("Couldn't allocate pseudo-tty");
640 status = EXIT_FATAL_ERROR;
641 goto fail;
642 }
643 set_up_tty(pty_slave, 1);
644 }
645
646 /*
647 * Lock the device if we've been asked to.
648 */
649 status = EXIT_LOCK_FAILED;
650 if (lockflag && !privopen && !direct_tty) {
651 if (lock(devnam) < 0)
652 goto fail;
653 locked = 1;
654 }
655
656 /*
657 * Open the serial device and set it up to be the ppp interface.
658 * First we open it in non-blocking mode so we can set the
659 * various termios flags appropriately. If we aren't dialling
660 * out and we want to use the modem lines, we reopen it later
661 * in order to wait for the carrier detect signal from the modem.
662 */
663 hungup = 0;
664 kill_link = 0;
665 connector = doing_callback? callback_script: connect_script;
666 if (direct_tty) {
667 ttyfd = 0;
668 } else if (devnam[0] != '\0') {
669 for (;;) {
670 /* If the user specified the device name, become the
671 user before opening it. */
672 int err;
673 if (!devnam_info.priv && !privopen)
674 (void) seteuid(uid);
675 if ((ttyfd = sys_extra_fd()) < 0)
676 ttyfd = open(devnam, O_NONBLOCK | O_RDWR);
677 err = errno;
678 if (!devnam_info.priv && !privopen)
679 (void) seteuid(0);
680 if (ttyfd >= 0)
681 break;
682 errno = err;
683 if (err != EINTR) {
684 error("Failed to open %s: %m", devnam);
685 status = EXIT_OPEN_FAILED;
686 }
687 if (!persist || err != EINTR)
688 goto fail;
689 }
690 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
691 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
692 warn("Couldn't reset non-blocking mode on device: %m");
693
694 /*
695 * Do the equivalent of `mesg n' to stop broadcast messages.
696 */
697 if (fstat(ttyfd, &statbuf) < 0
698 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
699 warn("Couldn't restrict write permissions to %s: %m", devnam);
700 } else
701 tty_mode = statbuf.st_mode;
702
703 /*
704 * Set line speed, flow control, etc.
705 * If we have a non-null connection or initializer script,
706 * on most systems we set CLOCAL for now so that we can talk
707 * to the modem before carrier comes up. But this has the
708 * side effect that we might miss it if CD drops before we
709 * get to clear CLOCAL below. On systems where we can talk
710 * successfully to the modem with CLOCAL clear and CD down,
711 * we could clear CLOCAL at this point.
712 */
713 set_up_tty(ttyfd, ((connector != NULL && connector[0] != '\0')
714 || initializer != NULL));
715 real_ttyfd = ttyfd;
716 }
717
718 /*
719 * If the pty, socket, notty and/or record option was specified,
720 * start up the character shunt now.
721 */
722 status = EXIT_PTYCMD_FAILED;
723 if (ptycommand != NULL) {
724 if (record_file != NULL) {
725 int ipipe[2], opipe[2], ok;
726
727 if (pipe(ipipe) < 0 || pipe(opipe) < 0)
728 fatal("Couldn't create pipes for record option: %m");
729 dbglog("starting charshunt for pty option");
730 ok = device_script(ptycommand, opipe[0], ipipe[1], 1,
731 "record") == 0 && start_charshunt(ipipe[0], opipe[1]);
732 (void) close(ipipe[0]);
733 (void) close(ipipe[1]);
734 (void) close(opipe[0]);
735 (void) close(opipe[1]);
736 if (!ok)
737 goto fail;
738 } else {
739 if (device_script(ptycommand, pty_master, pty_master, 1,
740 "pty") < 0)
741 goto fail;
742 ttyfd = pty_slave;
743 (void) close(pty_master);
744 pty_master = -1;
745 }
746 } else if (pty_socket != NULL) {
747 int fd = open_socket(pty_socket);
748 if (fd < 0)
749 goto fail;
750 dbglog("starting charshunt for socket option");
751 if (!start_charshunt(fd, fd))
752 goto fail;
753 } else if (notty) {
754 dbglog("starting charshunt for notty option");
755 if (!start_charshunt(0, 1))
756 goto fail;
757 } else if (record_file != NULL) {
758 dbglog("starting charshunt for record option");
759 if (!start_charshunt(ttyfd, ttyfd))
760 goto fail;
761 }
762
763 /* run connection script */
764 if (((connector != NULL) && (connector[0] != '\0')) || initializer) {
765 if (real_ttyfd != -1) {
766 /* XXX do this if doing_callback == CALLBACK_DIALIN? */
767 if (!default_device && modem && !direct_tty) {
768 setdtr(real_ttyfd, 0); /* in case modem is off hook */
769 (void) sleep(1);
770 setdtr(real_ttyfd, 1);
771 }
772 }
773
774 if ((initializer != NULL) && (initializer[0] != '\0')) {
775 if (device_script(initializer, ttyfd, ttyfd, 0, "init") < 0) {
776 error("Initializer script failed");
777 status = EXIT_INIT_FAILED;
778 goto fail;
779 }
780 if (kill_link)
781 goto disconnect;
782
783 info("Serial port initialized.");
784 }
785
786 if ((connector != NULL) && (connector[0] != '\0')) {
787 if (device_script(connector, ttyfd, ttyfd, 0, "connect") < 0) {
788 error("Connect script failed");
789 status = EXIT_CONNECT_FAILED;
790 goto fail;
791 }
792 if (kill_link)
793 goto disconnect;
794
795 info("Serial connection established.");
796 }
797
798 /*
799 * Clear CLOCAL if modem option -- we now have carrier
800 * established, and we should respect loss of carrier.
801 */
802 if (real_ttyfd != -1)
803 set_up_tty(real_ttyfd, 0);
804
805 if (doing_callback == CALLBACK_DIALIN)
806 connector = NULL;
807 }
808
809 /* reopen tty if necessary to wait for carrier */
810 if (connector == NULL && modem && devnam[0] != '\0' && !direct_tty) {
811 for (;;) {
812 if ((i = open(devnam, O_RDWR)) >= 0)
813 break;
814 if (errno != EINTR) {
815 error("Failed to reopen %s: %m", devnam);
816 status = EXIT_OPEN_FAILED;
817 }
818 if (!persist || errno != EINTR || hungup || kill_link)
819 goto fail;
820 }
821 (void) close(i);
822 }
823
824 (void) slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
825 script_setenv("SPEED", numbuf, 0);
826
827 /* run welcome script, if any */
828 if ((welcomer != NULL) && (welcomer[0] != '\0')) {
829 if (device_script(welcomer, ttyfd, ttyfd, 0, "welcome") < 0)
830 warn("Welcome script failed");
831 }
832
833 /* set up the serial device as a ppp interface */
834 #ifdef HAVE_MULTILINK
835 (void) tdb_writelock(pppdb);
836 #endif
837 fd_ppp = establish_ppp(ttyfd);
838 if (fd_ppp < 0) {
839 #ifdef HAVE_MULTILINK
840 (void) tdb_writeunlock(pppdb);
841 #endif
842 status = EXIT_FATAL_ERROR;
843 goto disconnect;
844 }
845
846 if (!demand && ifunit >= 0)
847 set_ifunit(1);
848 #ifdef HAVE_MULTILINK
849 (void) tdb_writeunlock(pppdb);
850 #endif
851
852 /*
853 * Start opening the connection and wait for
854 * incoming events (reply, timeout, etc.).
855 */
856 notice("Connect: %s <--> %s", ifname, ppp_devnam);
857 (void) gettimeofday(&start_time, NULL);
858 link_stats_valid = 0;
859 script_unsetenv("CONNECT_TIME");
860 script_unsetenv("BYTES_SENT");
861 script_unsetenv("BYTES_RCVD");
862 lcp_lowerup(0);
863
864 /* Mostly for accounting purposes */
865 new_phase(PHASE_CONNECTED);
866
867 /*
868 * If we are initiating this connection, wait for a short
869 * time for something from the peer. This can avoid bouncing
870 * our packets off its tty before it has set up the tty.
871 */
872 add_fd(fd_ppp);
873 if (connect_delay != 0 && (connector != NULL || ptycommand != NULL)) {
874 struct timeval t;
875 t.tv_sec = connect_delay / 1000;
876 t.tv_usec = connect_delay % 1000;
877 wait_input(&t);
878 }
879
880 lcp_open(0); /* Start protocol */
881 open_ccp_flag = 0;
882 status = EXIT_NEGOTIATION_FAILED;
883 new_phase(PHASE_ESTABLISH);
884 while (phase != PHASE_DEAD) {
885 if (sigsetjmp(sigjmp, 1) == 0) {
886 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
887 if (kill_link || open_ccp_flag || got_sigchld) {
888 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
889 } else {
890 waiting = 1;
891 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
892 wait_input(timeleft(&timo));
893 }
894 }
895 waiting = 0;
896 calltimeout();
897 get_input();
898 if (kill_link) {
899 lcp_close(0, "User request");
900 kill_link = 0;
901 }
902 if (open_ccp_flag) {
903 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
904 /* Uncloak ourselves. */
905 ccp_fsm[0].flags &= ~OPT_SILENT;
906 (*ccp_protent.open)(0);
907 }
908 open_ccp_flag = 0;
909 }
910 if (got_sigchld)
911 (void) reap_kids(0); /* Don't leave dead kids lying around */
912 }
913
914 /*
915 * Print connect time and statistics.
916 */
917 if (link_stats_valid) {
918 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
919 info("Connect time %d.%d minutes.", t/10, t%10);
920 info("Sent %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F
921 " packets), received %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F
922 " packets).",
923 link_stats.bytes_out, link_stats.pkts_out,
924 link_stats.bytes_in, link_stats.pkts_in);
925 }
926
927 /*
928 * Delete pid file before disestablishing ppp. Otherwise it
929 * can happen that another pppd gets the same unit and then
930 * we delete its pid file.
931 */
932 if (!demand) {
933 if (pidfilename[0] != '\0'
934 && unlink(pidfilename) < 0 && errno != ENOENT)
935 warn("unable to delete pid file %s: %m", pidfilename);
936 pidfilename[0] = '\0';
937 }
938
939 /*
940 * If we may want to bring the link up again, transfer
941 * the ppp unit back to the loopback. Set the
942 * real serial device back to its normal mode of operation.
943 */
944 remove_fd(fd_ppp);
945 clean_check();
946 if (demand)
947 restore_loop();
948 disestablish_ppp(ttyfd);
949 fd_ppp = -1;
950 if (!hungup)
951 lcp_lowerdown(0);
952 if (!demand)
953 script_unsetenv("IFNAME");
954
955 /*
956 * Run disconnector script, if requested.
957 * XXX we may not be able to do this if the line has hung up!
958 */
959 disconnect:
960 if ((disconnect_script != NULL) && (disconnect_script[0] != '\0') &&
961 !hungup) {
962 new_phase(PHASE_DISCONNECT);
963 if (real_ttyfd >= 0)
964 set_up_tty(real_ttyfd, 1);
965 if (device_script(disconnect_script, ttyfd, ttyfd, 0,
966 "disconnect") < 0) {
967 warn("disconnect script failed");
968 } else {
969 info("Serial link disconnected.");
970 }
971 }
972
973 fail:
974 if (pty_master >= 0)
975 (void) close(pty_master);
976 if (pty_slave >= 0) {
977 (void) close(pty_slave);
978 pty_slave = -1;
979 }
980 if (real_ttyfd >= 0)
981 close_tty();
982 if (locked) {
983 locked = 0;
984 unlock();
985 }
986
987 if (!demand) {
988 if (pidfilename[0] != '\0'
989 && unlink(pidfilename) < 0 && errno != ENOENT)
990 warn("unable to delete pid file %s: %m", pidfilename);
991 pidfilename[0] = '\0';
992 }
993
994 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
995 break;
996
997 kill_link = 0;
998 if (demand)
999 demand_discard();
1000 t = need_holdoff? holdoff: 0;
1001 if (holdoff_hook != NULL)
1002 t = (*holdoff_hook)();
1003 if (t > 0) {
1004 new_phase(PHASE_HOLDOFF);
1005 TIMEOUT(holdoff_end, NULL, t);
1006 do {
1007 if (sigsetjmp(sigjmp, 1) == 0) {
1008 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL);
1009 if (kill_link || got_sigchld) {
1010 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
1011 } else {
1012 waiting = 1;
1013 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL);
1014 wait_input(timeleft(&timo));
1015 }
1016 }
1017 waiting = 0;
1018 calltimeout();
1019 if (kill_link) {
1020 kill_link = 0;
1021 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
1022 }
1023 if (got_sigchld)
1024 (void) reap_kids(0);
1025 } while (phase == PHASE_HOLDOFF);
1026 if (!persist)
1027 break;
1028 }
1029 }
1030
1031 /* Wait for scripts to finish */
1032 final_reap();
1033
1034 die(status);
1035 return (0);
1036 }
1037
1038 /*
1039 * setup_signals - initialize signal handling.
1040 */
1041 static void
setup_signals()1042 setup_signals()
1043 {
1044 struct sigaction sa;
1045
1046 /*
1047 * Compute mask of all interesting signals and install signal handlers
1048 * for each. Only one signal handler may be active at a time. Therefore,
1049 * all other signals should be masked when any handler is executing.
1050 */
1051 (void) sigemptyset(&main_sigmask);
1052 (void) sigaddset(&main_sigmask, SIGHUP);
1053 (void) sigaddset(&main_sigmask, SIGINT);
1054 (void) sigaddset(&main_sigmask, SIGTERM);
1055 (void) sigaddset(&main_sigmask, SIGCHLD);
1056 (void) sigaddset(&main_sigmask, SIGUSR2);
1057
1058 #define SIGNAL(s, handler) if (1) { \
1059 sa.sa_handler = handler; \
1060 if (sigaction(s, &sa, NULL) < 0) \
1061 fatal("Couldn't establish signal handler (%d): %m", s); \
1062 } else ((void)0)
1063
1064 sa.sa_mask = main_sigmask;
1065 sa.sa_flags = 0;
1066 /*CONSTANTCONDITION*/ SIGNAL(SIGHUP, hup); /* Hangup */
1067 /*CONSTANTCONDITION*/ SIGNAL(SIGINT, term); /* Interrupt */
1068 /*CONSTANTCONDITION*/ SIGNAL(SIGTERM, term); /* Terminate */
1069 /*CONSTANTCONDITION*/ SIGNAL(SIGCHLD, chld);
1070
1071 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
1072 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
1073
1074 /*
1075 * Install a handler for other signals which would otherwise
1076 * cause pppd to exit without cleaning up.
1077 */
1078 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, bad_signal);
1079 /*CONSTANTCONDITION*/ SIGNAL(SIGQUIT, bad_signal);
1080
1081 /* Do not hook any of these signals on Solaris; allow core dump instead */
1082 #ifndef SOL2
1083 /*CONSTANTCONDITION*/ SIGNAL(SIGABRT, bad_signal);
1084 /*CONSTANTCONDITION*/ SIGNAL(SIGFPE, bad_signal);
1085 /*CONSTANTCONDITION*/ SIGNAL(SIGILL, bad_signal);
1086 #ifndef DEBUG
1087 /*CONSTANTCONDITION*/ SIGNAL(SIGSEGV, bad_signal);
1088 #endif
1089 #ifdef SIGBUS
1090 /*CONSTANTCONDITION*/ SIGNAL(SIGBUS, bad_signal);
1091 #endif
1092 #ifdef SIGEMT
1093 /*CONSTANTCONDITION*/ SIGNAL(SIGEMT, bad_signal);
1094 #endif
1095 #ifdef SIGPOLL
1096 /*CONSTANTCONDITION*/ SIGNAL(SIGPOLL, bad_signal);
1097 #endif
1098 #ifdef SIGPROF
1099 /*CONSTANTCONDITION*/ SIGNAL(SIGPROF, bad_signal);
1100 #endif
1101 #ifdef SIGSYS
1102 /*CONSTANTCONDITION*/ SIGNAL(SIGSYS, bad_signal);
1103 #endif
1104 #ifdef SIGTRAP
1105 /*CONSTANTCONDITION*/ SIGNAL(SIGTRAP, bad_signal);
1106 #endif
1107 #ifdef SIGVTALRM
1108 /*CONSTANTCONDITION*/ SIGNAL(SIGVTALRM, bad_signal);
1109 #endif
1110 #ifdef SIGXCPU
1111 /*CONSTANTCONDITION*/ SIGNAL(SIGXCPU, bad_signal);
1112 #endif
1113 #ifdef SIGXFSZ
1114 /*CONSTANTCONDITION*/ SIGNAL(SIGXFSZ, bad_signal);
1115 #endif
1116 #endif
1117
1118 /*
1119 * Apparently we can get a SIGPIPE when we call syslog, if
1120 * syslogd has died and been restarted. Ignoring it seems
1121 * be sufficient.
1122 */
1123 (void) signal(SIGPIPE, SIG_IGN);
1124 }
1125
1126 /*
1127 * set_ifunit - do things we need to do once we know which ppp
1128 * unit we are using.
1129 */
1130 void
set_ifunit(iskey)1131 set_ifunit(iskey)
1132 int iskey;
1133 {
1134 sys_ifname();
1135 info("Using interface %s", ifname);
1136 script_setenv("IFNAME", ifname, iskey);
1137 if (iskey) {
1138 create_pidfile(); /* write pid to file */
1139 create_linkpidfile();
1140 }
1141 }
1142
1143 /*
1144 * detach - detach us from the controlling terminal.
1145 */
1146 void
detach()1147 detach()
1148 {
1149 pid_t pid;
1150 char numbuf[16];
1151
1152 if (detached)
1153 return;
1154 if ((pid = fork()) == (pid_t)-1) {
1155 error("Couldn't detach (fork failed: %m)");
1156 die(1); /* or just return? */
1157 }
1158 if (pid != (pid_t)0) {
1159 /* parent */
1160 if (locked)
1161 (void) relock(pid);
1162 exit(0); /* parent dies */
1163 }
1164 (void) setsid();
1165 /*
1166 * Fork again to relinquish session leadership. This is needed
1167 * to prevent the daemon from acquiring controlling terminal.
1168 */
1169 if ((pid = fork()) == (pid_t)-1) {
1170 error("Couldn't detach (second fork failed: %m)");
1171 die(1); /* or just return? */
1172 }
1173 if (pid != (pid_t)0) {
1174 /* parent */
1175 if (locked)
1176 (void) relock(pid);
1177 exit(0); /* parent dies */
1178 }
1179 (void) chdir("/");
1180 (void) close(0);
1181 (void) close(1);
1182 (void) close(2);
1183 detached = 1;
1184 if (!log_to_file && !log_to_specific_fd)
1185 log_to_fd = -1;
1186 /* update pid files if they have been written already */
1187 if (pidfilename[0] != '\0')
1188 create_pidfile();
1189 if (linkpidfile[0] != '\0')
1190 create_linkpidfile();
1191 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid());
1192 script_setenv("PPPD_PID", numbuf, 1);
1193 }
1194
1195 /*
1196 * reopen_log - (re)open our connection to syslog.
1197 */
1198 void
reopen_log()1199 reopen_log()
1200 {
1201 #ifdef ULTRIX
1202 openlog("pppd", LOG_PID);
1203 #else
1204 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
1205 (void) setlogmask(LOG_UPTO(LOG_INFO));
1206 #endif
1207 }
1208
1209 /*
1210 * Create a file containing our process ID.
1211 */
1212 static void
create_pidfile()1213 create_pidfile()
1214 {
1215 FILE *pidfile;
1216
1217 (void) slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
1218 _PATH_VARRUN, ifname);
1219 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
1220 (void) fprintf(pidfile, "%u\n", (unsigned)getpid());
1221 (void) fclose(pidfile);
1222 } else {
1223 error("Failed to create pid file %s: %m", pidfilename);
1224 pidfilename[0] = '\0';
1225 }
1226 }
1227
1228 static void
create_linkpidfile()1229 create_linkpidfile()
1230 {
1231 FILE *pidfile;
1232
1233 if (linkname[0] == '\0')
1234 return;
1235 script_setenv("LINKNAME", linkname, 1);
1236 (void) slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
1237 _PATH_VARRUN, linkname);
1238 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
1239 (void) fprintf(pidfile, "%u\n", (unsigned)getpid());
1240 if (ifname[0] != '\0')
1241 (void) fprintf(pidfile, "%s\n", ifname);
1242 (void) fclose(pidfile);
1243 } else {
1244 error("Failed to create pid file %s: %m", linkpidfile);
1245 linkpidfile[0] = '\0';
1246 }
1247 }
1248
1249 /*
1250 * holdoff_end - called via a timeout when the holdoff period ends.
1251 */
1252 /*ARGSUSED*/
1253 static void
holdoff_end(arg)1254 holdoff_end(arg)
1255 void *arg;
1256 {
1257 new_phase(PHASE_DORMANT);
1258 }
1259
1260 /* List of protocol names, to make our messages a little more informative. */
1261 struct protocol_list {
1262 u_short proto;
1263 const char *name;
1264 } protocol_list[] = {
1265 { 0x21, "IP" },
1266 { 0x23, "OSI Network Layer" },
1267 { 0x25, "Xerox NS IDP" },
1268 { 0x27, "DECnet Phase IV" },
1269 { 0x29, "Appletalk" },
1270 { 0x2b, "Novell IPX" },
1271 { 0x2d, "VJ compressed TCP/IP" },
1272 { 0x2f, "VJ uncompressed TCP/IP" },
1273 { 0x31, "Bridging PDU" },
1274 { 0x33, "Stream Protocol ST-II" },
1275 { 0x35, "Banyan Vines" },
1276 { 0x37, "Old VJ compressed TCP/IP" },
1277 { 0x39, "AppleTalk EDDP" },
1278 { 0x3b, "AppleTalk SmartBuffered" },
1279 { 0x3d, "Multilink" },
1280 { 0x3f, "NetBIOS Frame" },
1281 { 0x41, "Cisco LAN Extension" },
1282 { 0x43, "Ascom Timeplex" },
1283 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1284 { 0x47, "DCA Remote Lan" },
1285 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1286 { 0x4b, "SNA over 802.2" },
1287 { 0x4d, "SNA" },
1288 { 0x4f, "IP6 Header Compression" },
1289 { 0x51, "KNX Bridging" },
1290 { 0x53, "Encrypted" },
1291 { 0x55, "per-link encrypted" },
1292 { 0x57, "IPv6" },
1293 { 0x59, "PPP Muxing" },
1294 { 0x6f, "Stampede Bridging" },
1295 { 0x73, "MP+" },
1296 { 0xc1, "STMF" },
1297 { 0xfb, "per-link compressed" },
1298 { 0xfd, "compressed datagram" },
1299 { 0x0201, "802.1d Hello Packets" },
1300 { 0x0203, "IBM Source Routing BPDU" },
1301 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1302 { 0x0207, "Cisco Discovery Protocol" },
1303 { 0x0231, "Luxcom" },
1304 { 0x0233, "Sigma Network Systems" },
1305 { 0x0235, "Apple Client Server Protocol" },
1306 { 0x0281, "MPLS Unicast" },
1307 { 0x0283, "MPLS Multicast" },
1308 { 0x0285, "IEEE p1284.4" },
1309 { 0x0287, "ETSI TETRA TNP1" },
1310 { 0x4021, "Stacker LZS" },
1311 { 0x8021, "Internet Protocol Control Protocol" },
1312 { 0x8023, "OSI Network Layer Control Protocol" },
1313 { 0x8025, "Xerox NS IDP Control Protocol" },
1314 { 0x8027, "DECnet Phase IV Control Protocol" },
1315 { 0x8029, "Appletalk Control Protocol" },
1316 { 0x802b, "Novell IPX Control Protocol" },
1317 { 0x8031, "Bridging Control Protocol" },
1318 { 0x8033, "Stream Protocol Control Protocol" },
1319 { 0x8035, "Banyan Vines Control Protocol" },
1320 { 0x803f, "NetBIOS Frames Control Protocol" },
1321 { 0x8041, "Cisco LAN Extension Control Protocol" },
1322 { 0x8043, "Ascom Timeplex Control Protocol" },
1323 { 0x8045, "Fujitsu LBLB Control Protocol" },
1324 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1325 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1326 { 0x804b, "SNA over 802.2 Control Protocol" },
1327 { 0x804d, "SNA Control Protocol" },
1328 { 0x8051, "KNX Bridging Control Protocol" },
1329 { 0x8053, "Encryption Control Protocol" },
1330 { 0x8055, "Per-link Encryption Control Protocol" },
1331 { 0x8057, "IPv6 Control Protocol" },
1332 { 0x806f, "Stampede Bridging Control Protocol" },
1333 { 0x80c1, "STMF Control Protocol" },
1334 { 0x80fb, "Per-link Compression Control Protocol" },
1335 { 0x80fd, "Compression Control Protocol" },
1336 { 0x8207, "Cisco Discovery Control Protocol" },
1337 { 0x8235, "Apple Client Server Control Protocol" },
1338 { 0x8281, "MPLS Control Protocol" },
1339 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1340 { 0xc021, "Link Control Protocol" },
1341 { 0xc023, "Password Authentication Protocol" },
1342 { 0xc025, "Link Quality Report" },
1343 { 0xc027, "Shiva Password Authentication Protocol" },
1344 { 0xc029, "CallBack Control Protocol (CBCP)" },
1345 { 0xc02b, "Bandwidth Allocation Control Protocol" },
1346 { 0xc02d, "BAP" },
1347 { 0xc081, "Container Control Protocol" },
1348 { 0xc223, "Challenge Handshake Authentication Protocol" },
1349 { 0xc227, "Extensible Authentication Protocol" },
1350 { 0xc281, "Funk Proprietary Authentication Protocol" },
1351 { 0, NULL },
1352 };
1353
1354 /*
1355 * protocol_name - find a name for a PPP protocol.
1356 */
1357 const char *
protocol_name(proto)1358 protocol_name(proto)
1359 int proto;
1360 {
1361 struct protocol_list *lp;
1362
1363 for (lp = protocol_list; lp->proto != 0; ++lp)
1364 if (proto == lp->proto)
1365 return (lp->name);
1366 return (NULL);
1367 }
1368
1369 static const char *phase_names[] = { PHASE__NAMES };
1370
1371 const char *
phase_name(pval)1372 phase_name(pval)
1373 int pval;
1374 {
1375 static char buf[32];
1376
1377 if (pval < 0 || pval >= Dim(phase_names)) {
1378 (void) slprintf(buf, sizeof (buf), "unknown %d", pval);
1379 return ((const char *)buf);
1380 }
1381 return (phase_names[pval]);
1382 }
1383
1384 /*
1385 * get_input - called when incoming data is available.
1386 */
1387 static void
get_input()1388 get_input()
1389 {
1390 int len, i;
1391 u_char *p;
1392 u_short protocol;
1393 struct protent *protp;
1394 const char *pname;
1395
1396 p = inpacket_buf; /* point to beginning of packet buffer */
1397
1398 len = read_packet(inpacket_buf);
1399 if (len < 0)
1400 return;
1401
1402 if (len == 0) {
1403 notice("Modem hangup");
1404 hungup = 1;
1405 status = EXIT_HANGUP;
1406 lcp_lowerdown(0); /* serial link is no longer available */
1407 link_terminated(0);
1408 return;
1409 }
1410
1411 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1412 dbglog("rcvd %P", p, len);
1413
1414 if (len < PPP_HDRLEN) {
1415 dbglog("Discarded short packet (%d < %d)", len, PPP_HDRLEN);
1416 return;
1417 }
1418
1419 p += 2; /* Skip address and control */
1420 GETSHORT(protocol, p);
1421 len -= PPP_HDRLEN;
1422
1423 pname = debug ? NULL : protocol_name(protocol);
1424
1425 /*
1426 * Toss all non-LCP packets unless LCP is in Opened state and
1427 * discard non-authentication protocols if we're not yet
1428 * authenticated.
1429 */
1430 if ((protocol != PPP_LCP &&
1431 (phase < PHASE_AUTHENTICATE || phase > PHASE_RUNNING)) ||
1432 (phase <= PHASE_AUTHENTICATE &&
1433 !(protocol == PPP_LCP || protocol == PPP_LQR ||
1434 protocol == PPP_PAP || protocol == PPP_CHAP))) {
1435 if (pname == NULL)
1436 dbglog("Discarded proto 0x%x in %s phase",
1437 protocol, phase_name(phase));
1438 else
1439 dbglog("Discarded %s (0x%x) in %s phase",
1440 pname, protocol, phase_name(phase));
1441 return;
1442 }
1443
1444 /*
1445 * Upcall the proper protocol input routine.
1446 */
1447 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1448 if (protp->protocol == protocol && protp->enabled_flag) {
1449 (*protp->input)(0, p, len);
1450 return;
1451 }
1452 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1453 && protp->datainput != NULL) {
1454 (*protp->datainput)(0, p, len);
1455 return;
1456 }
1457 }
1458
1459 if (debug) {
1460 if (pname != NULL)
1461 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1462 else
1463 warn("Unsupported protocol 0x%x received", protocol);
1464 }
1465 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1466 }
1467
1468 /*
1469 * new_phase - signal the start of a new phase of pppd's operation.
1470 */
1471 void
new_phase(p)1472 new_phase(p)
1473 int p;
1474 {
1475 if (new_phase_hook != NULL)
1476 (*new_phase_hook)(p, phase);
1477 phase = p;
1478 }
1479
1480 /*
1481 * die - clean up state and exit with the specified status.
1482 */
1483 void
die(status)1484 die(status)
1485 int status;
1486 {
1487 cleanup();
1488 if (phase != PHASE_EXIT) {
1489 syslog(LOG_INFO, "Exit.");
1490 new_phase(PHASE_EXIT);
1491 }
1492 exit(status);
1493 }
1494
1495 /*
1496 * cleanup - restore anything which needs to be restored before we exit
1497 */
1498 static void
cleanup()1499 cleanup()
1500 {
1501 sys_cleanup(); /* XXX: Need to check if this is okay after close_tty */
1502
1503 if (fd_ppp >= 0) {
1504 fd_ppp = -1;
1505 disestablish_ppp(ttyfd);
1506 }
1507 if (real_ttyfd >= 0)
1508 close_tty();
1509
1510 if (pidfilename[0] != '\0' && unlink(pidfilename) < 0 && errno != ENOENT)
1511 warn("unable to delete pid file %s: %m", pidfilename);
1512 pidfilename[0] = '\0';
1513 if (linkpidfile[0] != '\0' && unlink(linkpidfile) < 0 && errno != ENOENT)
1514 warn("unable to delete pid file %s: %m", linkpidfile);
1515 linkpidfile[0] = '\0';
1516
1517 if (locked) {
1518 locked = 0;
1519 unlock();
1520 }
1521
1522 #ifdef HAVE_MULTILINK
1523 if (pppdb != NULL) {
1524 cleanup_db();
1525 pppdb = NULL;
1526 }
1527 #endif
1528 }
1529
1530 /*
1531 * close_tty - restore the terminal device and close it.
1532 */
1533 static void
close_tty()1534 close_tty()
1535 {
1536 int fd = real_ttyfd;
1537
1538 real_ttyfd = -1;
1539
1540 /* drop dtr to hang up */
1541 if (!default_device && modem) {
1542 setdtr(fd, 0);
1543 /*
1544 * This sleep is in case the serial port has CLOCAL set by default,
1545 * and consequently will reassert DTR when we close the device.
1546 */
1547 (void) sleep(1);
1548 }
1549
1550 restore_tty(fd);
1551
1552 if (tty_mode != (mode_t) -1) {
1553 if (fchmod(fd, tty_mode) != 0) {
1554 /* XXX if devnam is a symlink, this will change the link */
1555 if (chmod(devnam, tty_mode) != 0) {
1556 error("Unable to chmod file %s: %m", devnam);
1557 }
1558 }
1559 }
1560
1561 (void) close(fd);
1562 }
1563
1564 /*
1565 * update_link_stats - get stats at link termination.
1566 */
1567 void
update_link_stats(u)1568 update_link_stats(u)
1569 int u;
1570 {
1571 struct timeval now;
1572 char numbuf[32];
1573
1574 if (gettimeofday(&now, NULL) >= 0) {
1575 link_connect_time = now.tv_sec - start_time.tv_sec;
1576 (void) slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1577 script_setenv("CONNECT_TIME", numbuf, 0);
1578 } else {
1579 link_connect_time = 0;
1580 }
1581
1582 if (get_ppp_stats(u, &link_stats)) {
1583 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1584 link_stats.bytes_out);
1585 script_setenv("BYTES_SENT", numbuf, 0);
1586 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1587 link_stats.bytes_in);
1588 script_setenv("BYTES_RCVD", numbuf, 0);
1589 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1590 link_stats.pkts_in);
1591 script_setenv("PKTS_RCVD", numbuf, 0);
1592 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F,
1593 link_stats.pkts_out);
1594 script_setenv("PKTS_SENT", numbuf, 0);
1595 link_stats_valid = 1;
1596 }
1597 }
1598
1599
1600 struct callout {
1601 struct timeval c_time; /* time at which to call routine */
1602 void *c_arg; /* argument to routine */
1603 void (*c_func) __P((void *)); /* routine */
1604 struct callout *c_next;
1605 };
1606
1607 static struct callout *callout = NULL; /* Callout list */
1608 static struct timeval timenow; /* Current time */
1609
1610 /*
1611 * timeout - Schedule a timeout.
1612 *
1613 * Note that this timeout takes the number of seconds, NOT hz (as in
1614 * the kernel).
1615 */
1616 void
1617 timeout(func, arg, time)
1618 void (*func) __P((void *));
1619 void *arg;
1620 int time;
1621 {
1622 struct callout *newp, *p, **pp;
1623
1624 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1625
1626 /*
1627 * Allocate timeout.
1628 */
1629 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1630 novm("callout structure for timeout.");
1631 newp->c_arg = arg;
1632 newp->c_func = func;
1633 (void) gettimeofday(&timenow, NULL);
1634 newp->c_time.tv_sec = timenow.tv_sec + time;
1635 newp->c_time.tv_usec = timenow.tv_usec;
1636
1637 /*
1638 * Find correct place and link it in.
1639 */
1640 for (pp = &callout; (p = *pp) != NULL; pp = &p->c_next)
1641 if (newp->c_time.tv_sec < p->c_time.tv_sec
1642 || (newp->c_time.tv_sec == p->c_time.tv_sec
1643 && newp->c_time.tv_usec < p->c_time.tv_usec))
1644 break;
1645 newp->c_next = p;
1646 *pp = newp;
1647 }
1648
1649
1650 /*
1651 * untimeout - Unschedule a timeout.
1652 */
1653 void
1654 untimeout(func, arg)
1655 void (*func) __P((void *));
1656 void *arg;
1657 {
1658 struct callout **copp, *freep;
1659
1660 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1661
1662 /*
1663 * Find first matching timeout and remove it from the list.
1664 */
1665 for (copp = &callout; (freep = *copp) != NULL; copp = &freep->c_next)
1666 if (freep->c_func == func && freep->c_arg == arg) {
1667 *copp = freep->c_next;
1668 free((char *) freep);
1669 break;
1670 }
1671 }
1672
1673
1674 /*
1675 * calltimeout - Call any timeout routines which are now due.
1676 */
1677 static void
calltimeout()1678 calltimeout()
1679 {
1680 struct callout *p;
1681
1682 while (callout != NULL) {
1683 p = callout;
1684
1685 if (gettimeofday(&timenow, NULL) < 0)
1686 fatal("Failed to get time of day: %m");
1687 if (!(p->c_time.tv_sec < timenow.tv_sec
1688 || (p->c_time.tv_sec == timenow.tv_sec
1689 && p->c_time.tv_usec <= timenow.tv_usec)))
1690 break; /* no, it's not time yet */
1691
1692 callout = p->c_next;
1693 (*p->c_func)(p->c_arg);
1694
1695 free((char *) p);
1696 }
1697 }
1698
1699
1700 /*
1701 * timeleft - return the length of time until the next timeout is due.
1702 */
1703 static struct timeval *
timeleft(tvp)1704 timeleft(tvp)
1705 struct timeval *tvp;
1706 {
1707 if (callout == NULL)
1708 return (NULL);
1709
1710 (void) gettimeofday(&timenow, NULL);
1711 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1712 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1713 if (tvp->tv_usec < 0) {
1714 tvp->tv_usec += 1000000;
1715 tvp->tv_sec -= 1;
1716 }
1717 if (tvp->tv_sec < 0)
1718 tvp->tv_sec = tvp->tv_usec = 0;
1719
1720 return (tvp);
1721 }
1722
1723
1724 /*
1725 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1726 */
1727 static void
kill_my_pg(sig)1728 kill_my_pg(sig)
1729 int sig;
1730 {
1731 struct sigaction act, oldact;
1732 sigset_t mask;
1733
1734 BZERO(&act, sizeof (act));
1735 act.sa_handler = SIG_IGN;
1736 (void) sigemptyset(&mask);
1737 (void) sigaddset(&mask, sig);
1738 /*
1739 * Ignore signal 'sig' temporarily, before finally re-activating the
1740 * original handler. We need to do it in the following sequence, since
1741 * otherwise the signal handler for 'sig' will be called forever.
1742 */
1743 if (sigaction(sig, &act, &oldact) < 0) {
1744 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig);
1745 }
1746 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
1747 /*
1748 * Send signal 'sig' to all processes whose process group ID is equal
1749 * to the process group ID of the sender.
1750 */
1751 (void) kill(0, sig);
1752 if (sigaction(sig, &oldact, NULL) < 0) {
1753 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig);
1754 }
1755 }
1756
1757
1758 /*
1759 * hup - Catch SIGHUP signal.
1760 *
1761 * Indicates that the physical layer has been disconnected.
1762 * We don't rely on this indication; if the user has sent this
1763 * signal, we just take the link down.
1764 */
1765 static void
hup(sig)1766 hup(sig)
1767 int sig;
1768 {
1769 info("Hangup (SIGHUP)");
1770 kill_link = 1;
1771 if (status != EXIT_HANGUP)
1772 status = EXIT_USER_REQUEST;
1773 if (conn_running > 0)
1774 /* Send the signal to the [dis]connector process(es) also */
1775 kill_my_pg(sig);
1776 if (charshunt_pid)
1777 (void) kill(charshunt_pid, sig);
1778 if (waiting)
1779 siglongjmp(sigjmp, 1);
1780 }
1781
1782
1783 /*
1784 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1785 *
1786 * Indicates that we should initiate a graceful disconnect and exit.
1787 */
1788 /*ARGSUSED*/
1789 static void
term(sig)1790 term(sig)
1791 int sig;
1792 {
1793 info("Terminating on signal %d.", sig);
1794 persist = 0; /* don't try to restart */
1795 kill_link = 1;
1796 status = EXIT_USER_REQUEST;
1797 if (conn_running > 0)
1798 /* Send the signal to the [dis]connector process(es) also */
1799 kill_my_pg(sig);
1800 if (charshunt_pid)
1801 (void) kill(charshunt_pid, sig);
1802 if (waiting)
1803 siglongjmp(sigjmp, 1);
1804 }
1805
1806
1807 /*
1808 * chld - Catch SIGCHLD signal.
1809 * Sets a flag so we will call reap_kids in the mainline.
1810 */
1811 /*ARGSUSED*/
1812 static void
chld(sig)1813 chld(sig)
1814 int sig;
1815 {
1816 got_sigchld = 1;
1817 if (waiting)
1818 siglongjmp(sigjmp, 1);
1819 }
1820
1821 /*
1822 * toggle_debug - Catch SIGUSR1 signal.
1823 *
1824 * Toggle debug flag.
1825 */
1826 /*ARGSUSED*/
1827 static void
toggle_debug(sig)1828 toggle_debug(sig)
1829 int sig;
1830 {
1831 if (debug) {
1832 print_ncpstate(0, NULL);
1833 dbglog("debug logging disabled");
1834 (void) setlogmask(LOG_UPTO(LOG_WARNING));
1835 debug = 0;
1836 } else {
1837 (void) setlogmask(LOG_UPTO(LOG_DEBUG));
1838 dbglog("debug logging enabled");
1839 print_ncpstate(0, NULL);
1840 debug = 1;
1841 }
1842 }
1843
1844
1845 /*
1846 * open_ccp - Catch SIGUSR2 signal.
1847 *
1848 * Try to (re)negotiate compression.
1849 */
1850 /*ARGSUSED*/
1851 static void
open_ccp(sig)1852 open_ccp(sig)
1853 int sig;
1854 {
1855 open_ccp_flag = 1;
1856 if (waiting)
1857 siglongjmp(sigjmp, 1);
1858 }
1859
1860
1861 /*
1862 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1863 */
1864 static void
bad_signal(sig)1865 bad_signal(sig)
1866 int sig;
1867 {
1868 static int crashed = 0;
1869
1870 if (crashed)
1871 _exit(127);
1872 crashed = 1;
1873 error("Fatal signal %d", sig);
1874 if (conn_running > 0)
1875 kill_my_pg(SIGTERM);
1876 if (charshunt_pid)
1877 (void) kill(charshunt_pid, SIGTERM);
1878 die(127);
1879 }
1880
1881
1882 /*
1883 * device_script - run a program to talk to the serial device
1884 * (e.g. to run the connector or disconnector script).
1885 */
1886 static int
device_script(program,in,out,dont_wait,optname)1887 device_script(program, in, out, dont_wait, optname)
1888 char *program;
1889 int in, out;
1890 int dont_wait;
1891 char *optname;
1892 {
1893 pid_t pid;
1894 int status = -1;
1895 int errfd;
1896 int envpipe[2];
1897
1898 envpipe[0] = envpipe[1] = -1;
1899 if (!dont_wait && device_pipe_hook != NULL && pipe(envpipe) == -1) {
1900 error("Cannot create pipe for child: %m");
1901 return (-1);
1902 }
1903
1904 ++conn_running;
1905 pid = fork();
1906
1907 if (pid == (pid_t)-1) {
1908 --conn_running;
1909 error("Failed to create child process: %m");
1910 return (-1);
1911 }
1912
1913 if (pid == (pid_t)0) {
1914 sys_close();
1915 closelog();
1916 if (envpipe[0] >= 0) {
1917 if (envpipe[1] <= 2)
1918 envpipe[1] = dup(envpipe[1]);
1919 (void) close(envpipe[0]);
1920 }
1921 if (in == 2) {
1922 /* aargh!!! */
1923 int newin = dup(in);
1924 if (in == out)
1925 out = newin;
1926 in = newin;
1927 } else if (out == 2) {
1928 out = dup(out);
1929 }
1930 if (log_to_fd >= 0) {
1931 if (log_to_fd != 2) {
1932 if (dup2(log_to_fd, 2) < 0)
1933 error("dup2(log_to_fd, STDERR) failed: %m");
1934 }
1935 } else {
1936 (void) close(2);
1937 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1938 if (errfd >= 0 && errfd != 2) {
1939 if (dup2(errfd, 2) < 0)
1940 error("dup2(errfd, STDERR) failed: %m");
1941 (void) close(errfd);
1942 }
1943 }
1944 if (in != 0) {
1945 if (out == 0)
1946 out = dup(out);
1947 if (dup2(in, 0) < 0)
1948 error("dup2(in, STDIN) failed: %m");
1949 }
1950 if (out != 1) {
1951 if (dup2(out, 1) < 0)
1952 error("dup2(out, STDOUT) failed: %m");
1953 }
1954 if (envpipe[0] >= 0 && dup2(envpipe[1], 3) < 0)
1955 error("dup2(pipe, pipeout) failed: %m");
1956 if (real_ttyfd > 2)
1957 (void) close(real_ttyfd);
1958 if (pty_master > 2)
1959 (void) close(pty_master);
1960 if (pty_slave > 2) {
1961 (void) close(pty_slave);
1962 pty_slave = -1;
1963 }
1964 (void) setuid(uid);
1965 if (getuid() != uid) {
1966 error("setuid failed");
1967 exit(1);
1968 }
1969 (void) setgid(getgid());
1970 if (script_env != NULL) {
1971 while (*script_env != NULL) {
1972 if (putenv(*script_env) == -1)
1973 warn("unable to set %s for %s: %m", *script_env, program);
1974 script_env++;
1975 }
1976 }
1977 (void) execl("/bin/sh", "sh", "-c", program, (char *)0);
1978 error("could not exec /bin/sh: %m");
1979 exit(99);
1980 /* NOTREACHED */
1981 }
1982
1983 if (debug)
1984 dbglog("%s option: '%s' started (pid %d)", optname, program, pid);
1985 if (dont_wait) {
1986 record_child(pid, program, NULL, NULL);
1987 status = 0;
1988 } else {
1989 if (envpipe[0] >= 0) {
1990 (void) close(envpipe[1]);
1991 (*device_pipe_hook)(envpipe[0]);
1992 }
1993 while (waitpid(pid, &status, 0) < 0) {
1994 if (errno == EINTR)
1995 continue;
1996 fatal("error waiting for (dis)connection process: %m");
1997 }
1998 if (envpipe[0] >= 0)
1999 (void) close(envpipe[0]);
2000 --conn_running;
2001 }
2002
2003 return (status == 0 ? 0 : -1);
2004 }
2005
2006
2007 /*
2008 * run-program - execute a program with given arguments,
2009 * but don't wait for it.
2010 * If the program can't be executed, logs an error unless
2011 * must_exist is 0 and the program file doesn't exist.
2012 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
2013 * or isn't an executable plain file, or the process ID of the child.
2014 * If done != NULL, (*done)(arg, int) will be called later (within
2015 * reap_kids) if this routine returns value > 0.
2016 */
2017 pid_t
run_program(prog,args,must_exist,done,arg)2018 run_program(prog, args, must_exist, done, arg)
2019 char *prog;
2020 char **args;
2021 int must_exist;
2022 void (*done) __P((void *arg, int status));
2023 void *arg;
2024 {
2025 pid_t pid;
2026 struct stat sbuf;
2027 int retv;
2028
2029 /*
2030 * First check if the file exists and is executable.
2031 * We don't use access() because that would use the
2032 * real user-id, which might not be root, and the script
2033 * might be accessible only to root.
2034 */
2035 errno = EINVAL;
2036 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
2037 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
2038 if (must_exist || errno != ENOENT)
2039 warn("Can't execute %s: %m", prog);
2040 return (0);
2041 }
2042
2043 if (updown_script_hook != NULL) {
2044 retv = (*updown_script_hook)((const char ***)&args);
2045 if (retv == -1) {
2046 return (-1);
2047 }
2048 }
2049
2050 pid = fork();
2051 if (pid == (pid_t)-1) {
2052 error("Failed to create child process for %s: %m", prog);
2053 return (-1);
2054 }
2055 if (pid == (pid_t)0) {
2056 int new_fd;
2057
2058 /* Leave the current location */
2059 (void) setsid(); /* No controlling tty. */
2060 (void) umask (S_IRWXG|S_IRWXO);
2061 (void) chdir ("/"); /* no current directory. */
2062 (void) setuid(0); /* set real UID = root */
2063 (void) setgid(getegid());
2064
2065 /* Ensure that nothing of our device environment is inherited. */
2066 sys_close();
2067 closelog();
2068 (void) close(0);
2069 (void) close(1);
2070 (void) close(2);
2071 (void) close(ttyfd); /* tty interface to the ppp device */
2072 if (real_ttyfd >= 0)
2073 (void) close(real_ttyfd);
2074
2075 /* Don't pass handles to the PPP device, even by accident. */
2076 new_fd = open (_PATH_DEVNULL, O_RDWR);
2077 if (new_fd >= 0) {
2078 if (new_fd != 0) {
2079 if (dup2(new_fd, 0) < 0) /* stdin <- /dev/null */
2080 error("dup2(/dev/null, STDIN) failed: %m");
2081 (void) close(new_fd);
2082 }
2083 if (dup2(0, 1) < 0) /* stdout -> /dev/null */
2084 error("dup2(/dev/null, STDOUT) failed: %m");
2085 if (dup2(0, 2) < 0) /* stderr -> /dev/null */
2086 error("dup2(/dev/null, STDERR) failed: %m");
2087 }
2088
2089 #ifdef BSD
2090 /* Force the priority back to zero if pppd is running higher. */
2091 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
2092 warn("can't reset priority to 0: %m");
2093 #endif
2094
2095 /* SysV recommends a second fork at this point. */
2096
2097 /* run the program */
2098 (void) execve(prog, args, script_env);
2099 if (must_exist || errno != ENOENT) {
2100 /* have to reopen the log, there's nowhere else
2101 for the message to go. */
2102 reopen_log();
2103 syslog(LOG_ERR, "Can't execute %s: %m", prog);
2104 closelog();
2105 }
2106 _exit(-1);
2107 }
2108
2109 if (debug)
2110 dbglog("Script %s started (pid %d)", prog, pid);
2111 record_child(pid, prog, done, arg);
2112
2113 return (pid);
2114 }
2115
2116
2117 /*
2118 * record_child - add a child process to the list for reap_kids
2119 * to use.
2120 */
2121 static void
record_child(pid,prog,done,arg)2122 record_child(pid, prog, done, arg)
2123 pid_t pid;
2124 char *prog;
2125 void (*done) __P((void *, int));
2126 void *arg;
2127 {
2128 struct subprocess *chp;
2129
2130 ++n_children;
2131
2132 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
2133 if (chp == NULL) {
2134 warn("losing track of %s process", prog);
2135 } else {
2136 chp->pid = pid;
2137 chp->prog = prog;
2138 chp->done = done;
2139 chp->arg = arg;
2140 chp->next = children;
2141 children = chp;
2142 }
2143 }
2144
2145
2146 /*
2147 * reap_kids - get status from any dead child processes,
2148 * and log a message for abnormal terminations.
2149 */
2150 static int
reap_kids(waitfor)2151 reap_kids(waitfor)
2152 int waitfor;
2153 {
2154 pid_t pid;
2155 int status, i;
2156 struct subprocess *chp, **prevp;
2157
2158 got_sigchld = 0;
2159 if (n_children == 0)
2160 return (0);
2161
2162 /*CONSTANTCONDITION*/
2163 while (1) {
2164 pid = waitpid(-1, &status, (waitfor ? 0 : WNOHANG));
2165 if (pid == 0) {
2166 break; /* return 0 */
2167 } else if (pid == -1) {
2168 if (errno == EINTR)
2169 continue;
2170 if (errno != ECHILD)
2171 error("Error waiting for child process: %m");
2172 return (-1);
2173 } else {
2174 for (prevp = &children; (chp = *prevp) != NULL;
2175 prevp = &chp->next) {
2176 if (chp->pid == pid) {
2177 --n_children;
2178 *prevp = chp->next;
2179 break;
2180 }
2181 }
2182 if (WIFSIGNALED(status) || WIFSTOPPED(status)) {
2183 i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status);
2184 warn("Child process %s (pid %d) %s with signal %d (%s)",
2185 (chp != NULL ? chp->prog : "??"), pid,
2186 (WIFSIGNALED(status) ? "terminated" : "stopped"),
2187 i, signal_name(i));
2188 } else if (debug) {
2189 dbglog("Child process %s finished (pid %d), status = %d",
2190 (chp != NULL ? chp->prog: "??"), pid,
2191 WEXITSTATUS(status));
2192 }
2193 if ((chp != NULL) && (chp->done != NULL))
2194 (*chp->done)(chp->arg, status);
2195 if (chp != NULL)
2196 free(chp);
2197 }
2198 }
2199 return (0);
2200 }
2201
2202 /*
2203 * infanticide - timeout while waiting for child process.
2204 */
2205 /*ARGSUSED*/
2206 static void
infanticide(sig)2207 infanticide(sig)
2208 int sig;
2209 {
2210 struct subprocess *chp;
2211 static int runcount = 0;
2212
2213 if (runcount < 2) {
2214 for (chp = children; chp != NULL; chp = chp->next)
2215 (void) kill(chp->pid, runcount == 0 ? SIGTERM : SIGKILL);
2216 } else {
2217 kill_my_pg(SIGTERM);
2218 /* Quit and hope for the best. */
2219 n_children = 0;
2220 }
2221 runcount++;
2222 }
2223
2224 /*
2225 * Perform final wait before exiting.
2226 */
2227 static void
final_reap()2228 final_reap()
2229 {
2230 struct sigaction sa;
2231 struct subprocess *chp;
2232
2233 if (n_children > 0 && debug) {
2234 dbglog("Waiting for %d child processes...", n_children);
2235 for (chp = children; chp != NULL; chp = chp->next)
2236 dbglog(" pid %d: %s", chp->pid, chp->prog);
2237 }
2238 BZERO(&sa, sizeof (sa));
2239 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, infanticide);
2240 while (n_children > 0) {
2241 (void) alarm(7);
2242 if (reap_kids(1) < 0)
2243 break;
2244 }
2245 (void) alarm(0);
2246 }
2247
2248 /*
2249 * novm - log an error message saying we ran out of memory, and die.
2250 */
2251 void
novm(msg)2252 novm(msg)
2253 char *msg;
2254 {
2255 fatal("Virtual memory exhausted allocating %s\n", msg);
2256 }
2257
2258 /*
2259 * script_setenv - set an environment variable value to be used
2260 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2261 */
2262 void
script_setenv(var,value,iskey)2263 script_setenv(var, value, iskey)
2264 const char *var;
2265 const char *value;
2266 int iskey;
2267 {
2268 size_t varl = strlen(var);
2269 size_t vl = varl + strlen(value) + 2;
2270 int i;
2271 char *p, *newstring;
2272
2273 /*
2274 * XXX: Can we assert that a tdb write lock is held here ? It appears that
2275 * Linux's use of tdb is not safe.
2276 */
2277 newstring = (char *) malloc(vl+1);
2278 if (newstring == NULL) {
2279 novm("script environment string");
2280 return;
2281 }
2282 *newstring++ = iskey;
2283 (void) slprintf(newstring, vl, "%s=%s", var, value);
2284
2285 /* check if this variable is already set */
2286 if (script_env != NULL) {
2287 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2288 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2289 #ifdef HAVE_MULTILINK
2290 if (p[-1] != '\0' && pppdb != NULL)
2291 delete_db_key(p);
2292 #endif
2293 free(p-1);
2294 script_env[i] = newstring;
2295 #ifdef HAVE_MULTILINK
2296 if (iskey && pppdb != NULL)
2297 add_db_key(newstring);
2298 update_db_entry();
2299 #endif
2300 return;
2301 }
2302 }
2303 } else {
2304 /* no space allocated for script env. ptrs. yet */
2305 i = 0;
2306 script_env = (char **) malloc(16 * sizeof(char *));
2307 if (script_env == NULL) {
2308 novm("script environment variable.");
2309 return;
2310 }
2311 s_env_nalloc = 16;
2312 }
2313
2314 /* reallocate script_env with more space if needed */
2315 if (i + 1 >= s_env_nalloc) {
2316 int new_n = i + 17;
2317 char **newenv = (char **) realloc((void *)script_env,
2318 new_n * sizeof(char *));
2319 if (newenv == NULL) {
2320 novm("expanded script environment variable.");
2321 return;
2322 }
2323 script_env = newenv;
2324 s_env_nalloc = new_n;
2325 }
2326
2327 script_env[i] = newstring;
2328 script_env[i+1] = NULL;
2329
2330 #ifdef HAVE_MULTILINK
2331 if (pppdb != NULL) {
2332 if (iskey)
2333 add_db_key(newstring);
2334 update_db_entry();
2335 }
2336 #endif
2337 }
2338
2339 /*
2340 * script_unsetenv - remove a variable from the environment
2341 * for scripts.
2342 */
2343 void
script_unsetenv(var)2344 script_unsetenv(var)
2345 const char *var;
2346 {
2347 int vl = strlen(var);
2348 int i;
2349 char *p;
2350
2351 /*
2352 * XXX: Can we assert that a tdb write lock is held here ? It appears that
2353 * Linux's use of tdb is not safe.
2354 */
2355 if (script_env == NULL)
2356 return;
2357 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2358 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2359 #ifdef HAVE_MULTILINK
2360 if (p[-1] != '\0' && pppdb != NULL)
2361 delete_db_key(p);
2362 #endif
2363 free(p-1);
2364 while ((script_env[i] = script_env[i+1]) != NULL)
2365 ++i;
2366 break;
2367 }
2368 }
2369 #ifdef HAVE_MULTILINK
2370 if ((pppdb != NULL) && (p != NULL))
2371 update_db_entry();
2372 #endif
2373 }
2374
2375 /*
2376 * script_getenv - find a variable in the script environment.
2377 */
2378 const char *
script_getenv(var)2379 script_getenv(var)
2380 const char *var;
2381 {
2382 int vl = strlen(var);
2383 int i;
2384 char *p;
2385
2386 if (script_env == NULL)
2387 return (NULL);
2388 for (i = 0; (p = script_env[i]) != NULL; ++i) {
2389 if (strncmp(p, var, vl) == 0 && p[vl] == '=')
2390 return ((const char *)p+vl+1);
2391 }
2392 return (NULL);
2393 }
2394
2395 #ifdef HAVE_MULTILINK
2396 /*
2397 * update_db_entry - update our entry in the database.
2398 */
2399 static void
update_db_entry()2400 update_db_entry()
2401 {
2402 TDB_DATA key, dbuf;
2403 int vlen, i;
2404 char *p, *q, *vbuf;
2405
2406 if (script_env == NULL)
2407 return;
2408 /*
2409 * vlen needs to be initialized as 1, or otherwise, the last string
2410 * is truncated by slprintf.
2411 */
2412 vlen = 1;
2413 for (i = 0; (p = script_env[i]) != NULL; ++i)
2414 vlen += strlen(p) + 1;
2415 vbuf = malloc(vlen);
2416 if (vbuf == NULL)
2417 novm("database entry");
2418 q = vbuf;
2419 for (i = 0; (p = script_env[i]) != NULL; ++i)
2420 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2421
2422 key.dptr = db_key;
2423 key.dsize = strlen(db_key);
2424 dbuf.dptr = vbuf;
2425 dbuf.dsize = vlen;
2426 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2427 error("tdb_store failed: %s", tdb_error(pppdb));
2428 }
2429
2430 /*
2431 * add_db_key - add a key that we can use to look up our database entry.
2432 */
2433 static void
add_db_key(str)2434 add_db_key(str)
2435 const char *str;
2436 {
2437 TDB_DATA key, dbuf;
2438
2439 key.dptr = (char *) str;
2440 key.dsize = strlen(str);
2441 dbuf.dptr = db_key;
2442 dbuf.dsize = strlen(db_key);
2443 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2444 error("tdb_store key failed: %s", tdb_error(pppdb));
2445 }
2446
2447 /*
2448 * delete_db_key - delete a key for looking up our database entry.
2449 */
2450 static void
delete_db_key(str)2451 delete_db_key(str)
2452 const char *str;
2453 {
2454 TDB_DATA key;
2455
2456 key.dptr = (char *) str;
2457 key.dsize = strlen(str);
2458 (void) tdb_delete(pppdb, key);
2459 }
2460
2461 /*
2462 * cleanup_db - delete all the entries we put in the database.
2463 */
2464 static void
cleanup_db()2465 cleanup_db()
2466 {
2467 TDB_DATA key;
2468 int i;
2469 char *p;
2470
2471 key.dptr = db_key;
2472 key.dsize = strlen(db_key);
2473 (void) tdb_delete(pppdb, key);
2474 for (i = 0; (p = script_env[i]) != NULL; ++i)
2475 if (p[-1] != '\0')
2476 delete_db_key(p);
2477 }
2478 #endif /* HAVE_MULTILINK */
2479
2480 /*
2481 * open_socket - establish a stream socket connection to the nominated
2482 * host and port.
2483 * XXX: Need IPv6 support for those systems that support it (use getaddrinfo),
2484 * but requires portability changes.
2485 */
2486 static int
open_socket(dest)2487 open_socket(dest)
2488 char *dest;
2489 {
2490 char *sep, *endp = NULL;
2491 int sock;
2492 int port = -1;
2493 u_int32_t host;
2494 struct hostent *hent = NULL;
2495 struct sockaddr_in sad;
2496 struct servent *se;
2497
2498 /* parse host:port and resolve host to an IP address */
2499 sep = strchr(dest, ':');
2500 if (sep != NULL) {
2501 se = getservbyname((const char *)sep+1, "tcp");
2502 if (se != NULL) {
2503 port = ntohs(se->s_port);
2504 } else {
2505 port = strtol(sep+1, &endp, 10);
2506 if (endp == sep+1 || *endp != '\0') {
2507 error("Can't parse host:port for socket destination");
2508 return (-1);
2509 }
2510 }
2511 }
2512 if (port < 0 || port > 65535 || sep == dest) {
2513 error("Can't parse host:port for socket destination");
2514 return (-1);
2515 }
2516 *sep = '\0';
2517 host = inet_addr(dest);
2518 if (host == (u_int32_t) -1) {
2519 hent = gethostbyname(dest);
2520 if (hent == NULL) {
2521 error("%s: unknown host in socket option", dest);
2522 *sep = ':';
2523 return (-1);
2524 }
2525 BCOPY(hent->h_addr_list[0], &host, sizeof(host));
2526 hent->h_addr_list++;
2527 }
2528 *sep = ':';
2529
2530 for (;;) {
2531 /* get a socket and connect it to the other end */
2532 sock = socket(PF_INET, SOCK_STREAM, 0);
2533 if (sock < 0) {
2534 error("Can't create socket: %m");
2535 return (-1);
2536 }
2537 BZERO(&sad, sizeof(sad));
2538 sad.sin_family = AF_INET;
2539 sad.sin_port = htons(port);
2540 sad.sin_addr.s_addr = host;
2541 if (connect(sock, (struct sockaddr *)&sad, sizeof(sad)) >= 0) {
2542 break; /* return sock file descriptor */
2543 }
2544 if ((hent != NULL) && (hent->h_addr_list != NULL)) {
2545 BCOPY(hent->h_addr_list[0], &host, sizeof(host));
2546 hent->h_addr_list++;
2547 (void) close(sock);
2548 continue;
2549 }
2550 error("Can't connect to %s: %m", dest);
2551 (void) close(sock);
2552 return (-1);
2553 }
2554 return (sock);
2555 }
2556
2557 /*
2558 * print_ncpstate - prints out current NCP state.
2559 *
2560 * We're normally called from SIGUSR1 here, but this is safe because
2561 * these signals are blocked unless we're idle waiting for events.
2562 * There's no need to otherwise lock the data structures referenced.
2563 */
2564 void
print_ncpstate(unit,strptr)2565 print_ncpstate(unit, strptr)
2566 int unit;
2567 FILE *strptr;
2568 {
2569 struct protent *protp;
2570 int i;
2571
2572 (void) flprintf(strptr, "In %s phase\n", phase_name(phase));
2573 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
2574 if (protp->print_stat != NULL)
2575 (*protp->print_stat)(unit, strptr);
2576 }
2577 sys_print_state(strptr);
2578 }
2579
2580 /*
2581 * start_charshunt - create a child process to run the character shunt.
2582 */
2583 static int
start_charshunt(ifd,ofd)2584 start_charshunt(ifd, ofd)
2585 int ifd, ofd;
2586 {
2587 pid_t cpid;
2588
2589 cpid = fork();
2590 if (cpid == (pid_t)-1) {
2591 error("Can't fork process for character shunt: %m");
2592 return (0);
2593 }
2594 if (cpid == (pid_t)0) {
2595 /* child */
2596 (void) close(pty_slave);
2597 pty_slave = -1;
2598 (void) setgid(getgid());
2599 (void) setuid(uid);
2600 if (getuid() != uid)
2601 fatal("setuid failed");
2602 if (!nodetach)
2603 log_to_fd = -1;
2604 charshunt(ifd, ofd, record_file);
2605 exit(0);
2606 }
2607 charshunt_pid = cpid;
2608 (void) close(pty_master);
2609 pty_master = -1;
2610 ttyfd = pty_slave;
2611 record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
2612 return (1);
2613 }
2614
2615 /*ARGSUSED*/
2616 static void
charshunt_done(arg,status)2617 charshunt_done(arg, status)
2618 void *arg;
2619 int status;
2620 {
2621 charshunt_pid = (pid_t)0;
2622 }
2623
2624 static void
reportme(int signo)2625 reportme(int signo)
2626 {
2627 dbglog("charshunt taking signal %d", signo);
2628 exit(1);
2629 }
2630
2631 /*
2632 * charshunt - the character shunt, which passes characters between
2633 * the pty master side and the serial port (or stdin/stdout).
2634 * This runs as the user (not as root).
2635 * (We assume ofd >= ifd which is true the way this gets called. :-).
2636 */
2637 static void
charshunt(ifd,ofd,record_file)2638 charshunt(ifd, ofd, record_file)
2639 int ifd, ofd;
2640 char *record_file;
2641 {
2642 int n, nfds;
2643 fd_set ready, writey;
2644 u_char *ibufp, *obufp;
2645 int nibuf, nobuf;
2646 int flags;
2647 struct timeval lasttime;
2648 FILE *recordf = NULL;
2649 int ilevel, olevel, max_level;
2650 struct timeval levelt, tout, *top;
2651
2652 /*
2653 * Reset signal handlers.
2654 */
2655 (void) signal(SIGHUP, SIG_IGN); /* Hangup */
2656 (void) signal(SIGINT, reportme); /* Interrupt */
2657 (void) signal(SIGTERM, reportme); /* Terminate */
2658 (void) signal(SIGCHLD, reportme);
2659 (void) signal(SIGUSR1, reportme);
2660 (void) signal(SIGUSR2, reportme);
2661 (void) signal(SIGABRT, reportme);
2662 (void) signal(SIGALRM, reportme);
2663 (void) signal(SIGFPE, reportme);
2664 (void) signal(SIGILL, reportme);
2665 (void) signal(SIGPIPE, reportme);
2666 (void) signal(SIGQUIT, reportme);
2667 #ifndef DEBUG
2668 (void) signal(SIGSEGV, reportme);
2669 #endif
2670 #ifdef SIGBUS
2671 (void) signal(SIGBUS, reportme);
2672 #endif
2673 #ifdef SIGEMT
2674 (void) signal(SIGEMT, reportme);
2675 #endif
2676 #ifdef SIGPOLL
2677 (void) signal(SIGPOLL, reportme);
2678 #endif
2679 #ifdef SIGPROF
2680 (void) signal(SIGPROF, reportme);
2681 #endif
2682 #ifdef SIGSYS
2683 (void) signal(SIGSYS, reportme);
2684 #endif
2685 #ifdef SIGTRAP
2686 (void) signal(SIGTRAP, reportme);
2687 #endif
2688 #ifdef SIGVTALRM
2689 (void) signal(SIGVTALRM, reportme);
2690 #endif
2691 #ifdef SIGXCPU
2692 (void) signal(SIGXCPU, reportme);
2693 #endif
2694 #ifdef SIGXFSZ
2695 (void) signal(SIGXFSZ, reportme);
2696 #endif
2697
2698 /*
2699 * Open the record file if required.
2700 */
2701 if (record_file != NULL) {
2702 recordf = fopen(record_file, "a");
2703 if (recordf == NULL)
2704 error("Couldn't create record file %s: %m", record_file);
2705 }
2706
2707 /* set all the fds to non-blocking mode */
2708 flags = fcntl(pty_master, F_GETFL);
2709 if (flags == -1
2710 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
2711 warn("couldn't set pty master to nonblock: %m");
2712 flags = fcntl(ifd, F_GETFL);
2713 if (flags == -1
2714 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
2715 warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
2716 if (ofd != ifd) {
2717 flags = fcntl(ofd, F_GETFL);
2718 if (flags == -1
2719 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
2720 warn("couldn't set stdout to nonblock: %m");
2721 }
2722
2723 nibuf = nobuf = 0;
2724 ibufp = obufp = NULL;
2725
2726 ilevel = olevel = 0;
2727 (void) gettimeofday(&levelt, NULL);
2728 if (max_data_rate) {
2729 max_level = max_data_rate / 10;
2730 if (max_level < MAXLEVELMINSIZE)
2731 max_level = MAXLEVELMINSIZE;
2732 } else
2733 max_level = sizeof(inpacket_buf) + 1;
2734
2735 nfds = (ofd > pty_master? ofd: pty_master) + 1;
2736 if (recordf != NULL) {
2737 (void) gettimeofday(&lasttime, NULL);
2738 (void) putc(RECMARK_TIMESTART, recordf); /* put start marker */
2739 (void) putc(lasttime.tv_sec >> 24, recordf);
2740 (void) putc(lasttime.tv_sec >> 16, recordf);
2741 (void) putc(lasttime.tv_sec >> 8, recordf);
2742 (void) putc(lasttime.tv_sec, recordf);
2743 lasttime.tv_usec = 0;
2744 }
2745
2746 while (nibuf != 0 || nobuf != 0 || ofd >= 0 || pty_master >= 0) {
2747 top = 0;
2748 tout.tv_sec = 0;
2749 tout.tv_usec = 10000;
2750 FD_ZERO(&ready);
2751 FD_ZERO(&writey);
2752 if (nibuf != 0) {
2753 if (ilevel >= max_level)
2754 top = &tout;
2755 else if (pty_master >= 0)
2756 FD_SET(pty_master, &writey);
2757 } else if (ifd >= 0)
2758 FD_SET(ifd, &ready);
2759 if (nobuf != 0) {
2760 if (olevel >= max_level)
2761 top = &tout;
2762 else if (ofd >= 0)
2763 FD_SET(ofd, &writey);
2764 } else {
2765 /* Don't read from pty if it's gone or it has closed. */
2766 if (pty_master >= 0 && ofd >= 0)
2767 FD_SET(pty_master, &ready);
2768 }
2769 if (select(nfds, &ready, &writey, NULL, top) < 0) {
2770 if (errno != EINTR)
2771 fatal("select");
2772 continue;
2773 }
2774 if (max_data_rate) {
2775 double dt;
2776 int nbt;
2777 struct timeval now;
2778
2779 (void) gettimeofday(&now, NULL);
2780 dt = (now.tv_sec - levelt.tv_sec
2781 + (now.tv_usec - levelt.tv_usec) / 1e6);
2782 nbt = (int)(dt * max_data_rate);
2783 ilevel = (nbt < 0 || nbt > ilevel)? 0: ilevel - nbt;
2784 olevel = (nbt < 0 || nbt > olevel)? 0: olevel - nbt;
2785 levelt = now;
2786 } else
2787 ilevel = olevel = 0;
2788 if (FD_ISSET(ifd, &ready)) {
2789 ibufp = inpacket_buf;
2790 nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
2791 if (nibuf < 0 && errno == EIO)
2792 nibuf = 0;
2793 if (nibuf < 0 || pty_master == -1) {
2794 if (errno != EINTR && errno != EAGAIN) {
2795 error("Error reading standard input: %m");
2796 break;
2797 }
2798 nibuf = 0;
2799 } else if (nibuf == 0) {
2800 /* end of file from stdin */
2801 (void) close(pty_master);
2802 pty_master = -1;
2803 (void) close(ifd);
2804 ifd = -1;
2805 if (recordf)
2806 if (!record_write(recordf, RECMARK_ENDRECV, NULL, 0,
2807 &lasttime))
2808 recordf = NULL;
2809 } else {
2810 FD_SET(pty_master, &writey);
2811 if (recordf)
2812 if (!record_write(recordf, RECMARK_STARTRECV, ibufp, nibuf,
2813 &lasttime))
2814 recordf = NULL;
2815 }
2816 }
2817 if (ofd >= 0 && pty_master >= 0 && FD_ISSET(pty_master, &ready)) {
2818 obufp = outpacket_buf;
2819 nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
2820 if (nobuf < 0 && errno == EIO)
2821 nobuf = 0;
2822 if (nobuf < 0 || ofd == -1) {
2823 if (!(errno == EINTR || errno == EAGAIN)) {
2824 error("Error reading pseudo-tty master: %m");
2825 break;
2826 }
2827 nobuf = 0;
2828 } else if (nobuf == 0) {
2829 /* end of file from the pty - slave side has closed */
2830 nibuf = 0;
2831 (void) close(ofd);
2832 ofd = -1;
2833 if (recordf)
2834 if (!record_write(recordf, RECMARK_ENDSEND, NULL, 0,
2835 &lasttime))
2836 recordf = NULL;
2837 } else {
2838 FD_SET(ofd, &writey);
2839 if (recordf)
2840 if (!record_write(recordf, RECMARK_STARTSEND, obufp, nobuf,
2841 &lasttime))
2842 recordf = NULL;
2843 }
2844 }
2845 if (ofd == -1)
2846 nobuf = 0;
2847 else if (FD_ISSET(ofd, &writey)) {
2848 n = nobuf;
2849 if (olevel + n > max_level)
2850 n = max_level - olevel;
2851 n = write(ofd, obufp, n);
2852 if (n < 0) {
2853 if (errno == EIO) {
2854 (void) close(ofd);
2855 ofd = -1;
2856 nobuf = 0;
2857 } else if (errno != EAGAIN && errno != EINTR) {
2858 error("Error writing standard output: %m");
2859 break;
2860 }
2861 } else {
2862 obufp += n;
2863 nobuf -= n;
2864 olevel += n;
2865 }
2866 }
2867 if (pty_master == -1)
2868 nibuf = 0;
2869 else if (FD_ISSET(pty_master, &writey)) {
2870 n = nibuf;
2871 if (ilevel + n > max_level)
2872 n = max_level - ilevel;
2873 n = write(pty_master, ibufp, n);
2874 if (n < 0) {
2875 if (errno == EAGAIN || errno == EINTR)
2876 continue;
2877 if (errno != EIO) {
2878 error("Error writing pseudo-tty master: %m");
2879 break;
2880 }
2881 (void) close(pty_master);
2882 pty_master = -1;
2883 nibuf = 0;
2884 } else {
2885 ibufp += n;
2886 nibuf -= n;
2887 ilevel += n;
2888 }
2889 }
2890 }
2891 exit(0);
2892 }
2893
2894 static int
record_write(f,code,buf,nb,tp)2895 record_write(f, code, buf, nb, tp)
2896 FILE *f;
2897 int code;
2898 u_char *buf;
2899 int nb;
2900 struct timeval *tp;
2901 {
2902 struct timeval now;
2903 int diff;
2904
2905 (void) gettimeofday(&now, NULL);
2906 now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
2907 diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
2908 if (diff > 0) {
2909 if (diff > 255) {
2910 (void) putc(RECMARK_TIMEDELTA32, f);
2911 (void) putc(diff >> 24, f);
2912 (void) putc(diff >> 16, f);
2913 (void) putc(diff >> 8, f);
2914 (void) putc(diff, f);
2915 } else {
2916 (void) putc(RECMARK_TIMEDELTA8, f);
2917 (void) putc(diff, f);
2918 }
2919 *tp = now;
2920 }
2921 (void) putc(code, f);
2922 if (buf != NULL) {
2923 (void) putc(nb >> 8, f);
2924 (void) putc(nb, f);
2925 (void) fwrite(buf, nb, 1, f);
2926 }
2927 (void) fflush(f);
2928 if (ferror(f)) {
2929 error("Error writing record file: %m");
2930 return (0);
2931 }
2932 return (1);
2933 }
2934