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 #define RCSID "$Id: main.c,v 1.97 2000/04/24 02:54:16 masputra Exp $" 38 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include <signal.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <syslog.h> 47 #include <netdb.h> 48 #include <pwd.h> 49 #include <setjmp.h> 50 #include <sys/param.h> 51 #include <sys/types.h> 52 #include <sys/wait.h> 53 #include <sys/time.h> 54 #include <sys/resource.h> 55 #include <sys/stat.h> 56 #include <sys/socket.h> 57 #include <netinet/in.h> 58 #include <arpa/inet.h> 59 60 #include "pppd.h" 61 #include "magic.h" 62 #include "fsm.h" 63 #include "lcp.h" 64 #include "ipcp.h" 65 #ifdef INET6 66 #include "ipv6cp.h" 67 #endif 68 #include "upap.h" 69 #include "chap.h" 70 #include "ccp.h" 71 #include "pathnames.h" 72 #include "patchlevel.h" 73 74 #ifdef HAVE_MULTILINK 75 #include "tdb.h" 76 #endif 77 78 #ifdef CBCP_SUPPORT 79 #include "cbcp.h" 80 #endif 81 82 #ifdef IPX_CHANGE 83 #include "ipxcp.h" 84 #endif /* IPX_CHANGE */ 85 #ifdef AT_CHANGE 86 #include "atcp.h" 87 #endif 88 89 #if !defined(lint) && !defined(_lint) 90 static const char rcsid[] = RCSID; 91 #endif 92 93 /* interface vars */ 94 char ifname[32]; /* Interface name */ 95 int ifunit = -1; /* Interface unit number */ 96 97 char *progname; /* Name of this program */ 98 char hostname[MAXHOSTNAMELEN+1]; /* Our hostname */ 99 static char pidfilename[MAXPATHLEN]; /* name of pid file */ 100 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ 101 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ 102 static uid_t uid; /* Our real user-id */ 103 static int conn_running; /* we have a [dis]connector running */ 104 105 int ttyfd; /* Serial port file descriptor */ 106 mode_t tty_mode = (mode_t)-1; /* Original access permissions to tty */ 107 int baud_rate; /* Actual bits/second for serial device */ 108 bool hungup; /* terminal has been hung up */ 109 bool privileged; /* we're running as real uid root */ 110 bool need_holdoff; /* need holdoff period before restarting */ 111 bool detached; /* have detached from terminal */ 112 struct stat devstat; /* result of stat() on devnam */ 113 bool prepass = 0; /* doing prepass to find device name */ 114 int devnam_fixed; /* set while in options.ttyxx file */ 115 volatile int status; /* exit status for pppd */ 116 int unsuccess; /* # unsuccessful connection attempts */ 117 int do_callback; /* != 0 if we should do callback next */ 118 int doing_callback; /* != 0 if we are doing callback */ 119 char *callback_script; /* script for doing callback */ 120 #ifdef HAVE_MULTILINK 121 TDB_CONTEXT *pppdb; /* database for storing status etc. */ 122 char db_key[32]; 123 #endif 124 125 /* 126 * For plug-in usage: 127 * 128 * holdoff_hook - Can be used to change the demand-dial hold-off 129 * time dynamically. This is normally set by the 130 * "holdoff" option, and is 30 seconds by default. 131 * 132 * new_phase_hook - This is called for each change in the PPP 133 * phase (per RFC 1661). This can be used to log 134 * progress. 135 * 136 * check_options_hook - This is called before doing sys_init() 137 * and allows the plugin to verify the selected options. 138 * 139 * updown_script_hook - This is called with the proposed 140 * command-line arguments for any of the 141 * /etc/ppp/{ip,ipv6,ipx,auth}-{up,down} scripts before 142 * fork/exec. It can be used to add or change arguments. 143 * 144 * device_pipe_hook - If this is set, then an extra fd (3) is 145 * passed to the connect/disconnect script. This extra 146 * fd is the write side of a pipe, and the read side is 147 * passed to this routine. This can be used to pass 148 * arbitrary data from the script back to pppd. 149 */ 150 int (*holdoff_hook) __P((void)) = NULL; 151 int (*new_phase_hook) __P((int new, int old)) = NULL; 152 int (*check_options_hook) __P((uid_t uid)) = NULL; 153 int (*updown_script_hook) __P((const char ***argsp)) = NULL; 154 void (*device_pipe_hook) __P((int pipefd)) = NULL; 155 156 static int fd_ppp = -1; /* fd for talking PPP */ 157 static int fd_loop; /* fd for getting demand-dial packets */ 158 static int pty_master; /* fd for master side of pty */ 159 int pty_slave = -1; /* fd for slave side of pty */ 160 static int real_ttyfd; /* fd for actual serial port (not pty) */ 161 162 int phase; /* where the link is at */ 163 int kill_link; 164 int open_ccp_flag; 165 166 static int waiting; /* for input from peer or timer expiration */ 167 static sigjmp_buf sigjmp; 168 169 char **script_env; /* Env. variable values for scripts */ 170 int s_env_nalloc; /* # words avail at script_env */ 171 172 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ 173 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ 174 u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */ 175 176 static int n_children; /* # child processes still running */ 177 static bool got_sigchld; /* set if we have received a SIGCHLD */ 178 static sigset_t main_sigmask; /* signals blocked while dispatching */ 179 180 static bool locked; /* lock() has succeeded */ 181 static bool privopen; /* don't lock, open device as root */ 182 183 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; 184 185 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ 186 int ngroups; /* How many groups valid in groups */ 187 188 static struct timeval start_time; /* Time when link was started. */ 189 190 struct pppd_stats link_stats; 191 int link_connect_time; 192 bool link_stats_valid; 193 194 static pid_t charshunt_pid; /* Process ID for charshunt */ 195 196 extern option_t general_options[]; 197 extern option_t auth_options[]; 198 199 /* 200 * We maintain a list of child process pids and 201 * functions to call when they exit. 202 */ 203 struct subprocess { 204 pid_t pid; 205 char *prog; 206 void (*done) __P((void *, int)); 207 void *arg; 208 struct subprocess *next; 209 }; 210 211 static struct subprocess *children; 212 213 /* Prototypes for procedures local to this file. */ 214 215 static void setup_signals __P((void)); 216 static void create_pidfile __P((void)); 217 static void create_linkpidfile __P((void)); 218 static void cleanup __P((void)); 219 static void close_tty __P((void)); 220 static void get_input __P((void)); 221 static void calltimeout __P((void)); 222 static struct timeval *timeleft __P((struct timeval *)); 223 static void kill_my_pg __P((int)); 224 static void hup __P((int)); 225 static void term __P((int)); 226 static void chld __P((int)); 227 static void toggle_debug __P((int)); 228 static void open_ccp __P((int)); 229 static void bad_signal __P((int)); 230 static void holdoff_end __P((void *)); 231 static int device_script __P((char *, int, int, int, char *)); 232 static int reap_kids __P((int waitfor)); 233 static void record_child __P((pid_t, char *, void (*) (void *, int), void *)); 234 static int open_socket __P((char *)); 235 static int start_charshunt __P((int, int)); 236 static void charshunt_done __P((void *, int)); 237 static void charshunt __P((int, int, char *)); 238 static int record_write __P((FILE *, int code, u_char *buf, int nb, 239 struct timeval *)); 240 static void final_reap __P((void)); 241 242 #ifdef HAVE_MULTILINK 243 static void update_db_entry __P((void)); 244 static void add_db_key __P((const char *)); 245 static void delete_db_key __P((const char *)); 246 static void cleanup_db __P((void)); 247 #endif 248 249 int main __P((int, char *[])); 250 251 #ifdef ultrix 252 #undef O_NONBLOCK 253 #define O_NONBLOCK O_NDELAY 254 #endif 255 256 #ifdef ULTRIX 257 #define setlogmask(x) 0 258 #endif 259 260 /* Backward compatibility for Linux */ 261 #ifndef RECMARK_TIMESTART 262 #define RECMARK_STARTSEND 1 263 #define RECMARK_STARTRECV 2 264 #define RECMARK_ENDSEND 3 265 #define RECMARK_ENDRECV 4 266 #define RECMARK_TIMEDELTA32 5 267 #define RECMARK_TIMEDELTA8 6 268 #define RECMARK_TIMESTART 7 269 #endif 270 271 /* 272 * PPP Data Link Layer "protocol" table. 273 * One entry per supported protocol. 274 * The last entry must be NULL. 275 */ 276 struct protent *protocols[] = { 277 &lcp_protent, 278 &pap_protent, 279 &chap_protent, 280 #ifdef CBCP_SUPPORT 281 &cbcp_protent, 282 #endif 283 &ipcp_protent, 284 #ifdef INET6 285 &ipv6cp_protent, 286 #endif 287 &ccp_protent, 288 #ifdef IPX_CHANGE 289 &ipxcp_protent, 290 #endif 291 #ifdef AT_CHANGE 292 &atcp_protent, 293 #endif 294 NULL 295 }; 296 297 int 298 main(argc, argv) 299 int argc; 300 char *argv[]; 301 { 302 int i, fdflags, t; 303 char *p, *connector; 304 struct passwd *pw; 305 struct timeval timo; 306 struct protent *protp; 307 struct stat statbuf; 308 char numbuf[16]; 309 310 ifname[0] = '\0'; 311 new_phase(PHASE_INITIALIZE); 312 313 /* 314 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else. 315 * This way we can close 0, 1, 2 in detach() without clobbering 316 * a fd that we are using. 317 */ 318 if ((i = open(_PATH_DEVNULL, O_RDWR)) >= 0) { 319 while (0 <= i && i <= 2) 320 i = dup(i); 321 if (i >= 0) 322 (void) close(i); 323 } 324 325 script_env = NULL; 326 327 /* Initialize syslog facilities */ 328 reopen_log(); 329 330 if (gethostname(hostname, MAXHOSTNAMELEN+1) < 0 ) { 331 option_error("Couldn't get hostname: %m"); 332 exit(1); 333 } 334 hostname[MAXHOSTNAMELEN] = '\0'; 335 336 /* make sure we don't create world or group writable files. */ 337 (void) umask(umask(0777) | 022); 338 339 uid = getuid(); 340 privileged = (uid == 0); 341 (void) slprintf(numbuf, sizeof(numbuf), "%d", uid); 342 script_setenv("ORIG_UID", numbuf, 0); 343 344 ngroups = getgroups(NGROUPS_MAX, groups); 345 346 /* 347 * Initialize magic number generator now so that protocols may 348 * use magic numbers in initialization. 349 */ 350 magic_init(); 351 352 progname = *argv; 353 prepass = 0; 354 /* 355 * Initialize to the standard option set, then parse, in order, the 356 * system options file, the user's options file, the tty's options file, 357 * and the command line arguments. At last, install the options declared 358 * by each protocol into the extra_option list. 359 */ 360 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 361 (*protp->init)(0); 362 if (protp->options != NULL) { 363 add_options(protp->options); 364 } 365 } 366 367 /* 368 * Install "generic" options into the extra_options list. 369 */ 370 add_options(auth_options); 371 add_options(general_options); 372 373 /* Install any system-specific options (or remove unusable ones) */ 374 sys_options(); 375 376 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) 377 || !options_from_user()) 378 exit(EXIT_OPTION_ERROR); 379 380 /* scan command line and options files to find device name */ 381 prepass = 1; 382 (void) parse_args(argc-1, argv+1); 383 prepass = 0; 384 385 /* 386 * Work out the device name, if it hasn't already been specified. 387 */ 388 using_pty = notty || ptycommand != NULL || pty_socket != NULL; 389 if (!using_pty && default_device && !direct_tty) { 390 char *p; 391 392 if (!isatty(0) || (p = ttyname(0)) == NULL) { 393 option_error("no device specified and stdin is not a tty"); 394 exit(EXIT_OPTION_ERROR); 395 } 396 (void) strlcpy(devnam, p, sizeof(devnam)); 397 if (stat(devnam, &devstat) < 0) 398 fatal("Couldn't stat default device %s: %m", devnam); 399 } 400 401 /* 402 * Parse the tty options file and the command line. 403 * The per-tty options file should not change 404 * ptycommand, pty_socket, notty or devnam. 405 */ 406 devnam_fixed = 1; 407 if (!using_pty && !direct_tty) { 408 if (!options_for_tty()) 409 exit(EXIT_OPTION_ERROR); 410 } 411 412 devnam_fixed = 0; 413 if (!parse_args(argc-1, argv+1)) 414 exit(EXIT_OPTION_ERROR); 415 416 /* 417 * Check that we are running as root. 418 */ 419 if (geteuid() != 0) { 420 option_error("must be root to run %s, since it is not setuid-root", 421 argv[0]); 422 exit(EXIT_NOT_ROOT); 423 } 424 425 if (!ppp_available()) { 426 option_error(no_ppp_msg); 427 exit(EXIT_NO_KERNEL_SUPPORT); 428 } 429 430 /* 431 * Check that the options given are valid and consistent. 432 */ 433 if (!sys_check_options()) 434 exit(EXIT_OPTION_ERROR); 435 auth_check_options(); 436 #ifdef HAVE_MULTILINK 437 mp_check_options(); 438 #endif 439 for (i = 0; (protp = protocols[i]) != NULL; ++i) 440 if (protp->enabled_flag && protp->check_options != NULL) 441 (*protp->check_options)(); 442 if (demand && (connect_script == NULL)) { 443 option_error("connect script is required for demand-dialling\n"); 444 exit(EXIT_OPTION_ERROR); 445 } 446 if (updetach && (nodetach || demand)) { 447 option_error("updetach cannot be used with %s", 448 nodetach ? "nodetach" : "demand"); 449 exit(EXIT_OPTION_ERROR); 450 } 451 /* default holdoff to 0 if no connect script has been given */ 452 if ((connect_script == NULL) && !holdoff_specified) 453 holdoff = 0; 454 455 if (using_pty || direct_tty) { 456 if (!default_device) { 457 option_error("%s option precludes specifying device name", 458 notty? "notty": "pty"); 459 exit(EXIT_OPTION_ERROR); 460 } 461 if (ptycommand != NULL && (notty || direct_tty)) { 462 option_error("pty option is incompatible with notty option"); 463 exit(EXIT_OPTION_ERROR); 464 } 465 if (pty_socket != NULL && (ptycommand != NULL || notty || 466 direct_tty)) { 467 option_error("socket option is incompatible with pty and notty"); 468 exit(EXIT_OPTION_ERROR); 469 } 470 default_device = notty || direct_tty; 471 lockflag = 0; 472 modem = 0; 473 if (default_device && log_to_fd <= 1) 474 log_to_fd = -1; 475 } else { 476 /* 477 * If the user has specified a device which is the same as 478 * the one on stdin, pretend they didn't specify any. 479 * If the device is already open read/write on stdin, 480 * we assume we don't need to lock it, and we can open it as root. 481 */ 482 if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode) 483 && statbuf.st_rdev == devstat.st_rdev) { 484 default_device = 1; 485 fdflags = fcntl(0, F_GETFL); 486 if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR) 487 privopen = 1; 488 } 489 } 490 if (default_device) 491 nodetach = 1; 492 493 /* 494 * Don't send log messages to the serial port, it tends to 495 * confuse the peer. :-) 496 */ 497 if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0 498 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev) 499 log_to_fd = -1; 500 early_log = 0; 501 502 if (debug) 503 (void) setlogmask(LOG_UPTO(LOG_DEBUG)); 504 505 /* 506 * Initialize system-dependent stuff. 507 */ 508 if (check_options_hook != NULL && 509 (*check_options_hook)(uid) == -1) { 510 exit(EXIT_OPTION_ERROR); 511 } 512 sys_init(!devnam_info.priv && !privopen); 513 514 #ifdef HAVE_MULTILINK 515 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); 516 if (pppdb != NULL) { 517 (void) slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); 518 update_db_entry(); 519 } else { 520 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); 521 if (multilink) { 522 warn("Warning: disabling multilink"); 523 multilink = 0; 524 } 525 } 526 #endif 527 528 /* 529 * Detach ourselves from the terminal, if required, and identify 530 * who is running us. Printing to stderr stops here unless 531 * nodetach or updetach is set. 532 */ 533 if (!nodetach && !updetach) 534 detach(); 535 p = getlogin(); 536 if (p == NULL) { 537 pw = getpwuid(uid); 538 if (pw != NULL && pw->pw_name != NULL) 539 p = pw->pw_name; 540 else 541 p = "(unknown)"; 542 } 543 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d", 544 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid); 545 script_setenv("PPPLOGNAME", p, 0); 546 547 if (devnam[0] != '\0') 548 script_setenv("DEVICE", devnam, 1); 549 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 550 script_setenv("PPPD_PID", numbuf, 1); 551 552 setup_signals(); 553 554 waiting = 0; 555 556 create_linkpidfile(); 557 558 /* 559 * If we're doing dial-on-demand, set up the interface now. 560 */ 561 if (demand) { 562 /* 563 * Open the loopback channel and set it up to be the ppp interface. 564 */ 565 #ifdef HAVE_MULTILINK 566 (void) tdb_writelock(pppdb); 567 #endif 568 set_ifunit(1); 569 fd_loop = open_ppp_loopback(); 570 #ifdef HAVE_MULTILINK 571 (void) tdb_writeunlock(pppdb); 572 #endif 573 574 /* 575 * Configure the interface and mark it up, etc. 576 */ 577 demand_conf(); 578 } 579 580 new_phase(PHASE_INITIALIZED); 581 do_callback = 0; 582 for (;;) { 583 584 need_holdoff = 1; 585 ttyfd = -1; 586 real_ttyfd = -1; 587 status = EXIT_OK; 588 ++unsuccess; 589 doing_callback = do_callback; 590 do_callback = 0; 591 592 if (demand && !doing_callback) { 593 /* 594 * Don't do anything until we see some activity. 595 */ 596 kill_link = 0; 597 new_phase(PHASE_DORMANT); 598 demand_unblock(); 599 add_fd(fd_loop); 600 for (;;) { 601 if (sigsetjmp(sigjmp, 1) == 0) { 602 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); 603 if (kill_link || got_sigchld) { 604 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 605 } else { 606 waiting = 1; 607 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 608 wait_input(timeleft(&timo)); 609 } 610 } 611 waiting = 0; 612 calltimeout(); 613 if (kill_link) { 614 if (!persist) 615 break; 616 kill_link = 0; 617 } 618 if (get_loop_output()) 619 break; 620 if (got_sigchld) 621 (void) reap_kids(0); 622 } 623 remove_fd(fd_loop); 624 if (kill_link && !persist) 625 break; 626 627 /* 628 * Now we want to bring up the link. 629 */ 630 demand_block(); 631 info("Starting link"); 632 } 633 634 new_phase(doing_callback ? PHASE_CALLINGBACK : PHASE_SERIALCONN); 635 636 /* 637 * Get a pty master/slave pair if the pty, notty, socket, 638 * or record options were specified. 639 */ 640 (void) strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam)); 641 pty_master = -1; 642 pty_slave = -1; 643 if (using_pty || record_file != NULL) { 644 if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) { 645 error("Couldn't allocate pseudo-tty"); 646 status = EXIT_FATAL_ERROR; 647 goto fail; 648 } 649 set_up_tty(pty_slave, 1); 650 } 651 652 /* 653 * Lock the device if we've been asked to. 654 */ 655 status = EXIT_LOCK_FAILED; 656 if (lockflag && !privopen && !direct_tty) { 657 if (lock(devnam) < 0) 658 goto fail; 659 locked = 1; 660 } 661 662 /* 663 * Open the serial device and set it up to be the ppp interface. 664 * First we open it in non-blocking mode so we can set the 665 * various termios flags appropriately. If we aren't dialling 666 * out and we want to use the modem lines, we reopen it later 667 * in order to wait for the carrier detect signal from the modem. 668 */ 669 hungup = 0; 670 kill_link = 0; 671 connector = doing_callback? callback_script: connect_script; 672 if (direct_tty) { 673 ttyfd = 0; 674 } else if (devnam[0] != '\0') { 675 for (;;) { 676 /* If the user specified the device name, become the 677 user before opening it. */ 678 int err; 679 if (!devnam_info.priv && !privopen) 680 (void) seteuid(uid); 681 if ((ttyfd = sys_extra_fd()) < 0) 682 ttyfd = open(devnam, O_NONBLOCK | O_RDWR); 683 err = errno; 684 if (!devnam_info.priv && !privopen) 685 (void) seteuid(0); 686 if (ttyfd >= 0) 687 break; 688 errno = err; 689 if (err != EINTR) { 690 error("Failed to open %s: %m", devnam); 691 status = EXIT_OPEN_FAILED; 692 } 693 if (!persist || err != EINTR) 694 goto fail; 695 } 696 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1 697 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) 698 warn("Couldn't reset non-blocking mode on device: %m"); 699 700 /* 701 * Do the equivalent of `mesg n' to stop broadcast messages. 702 */ 703 if (fstat(ttyfd, &statbuf) < 0 704 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) { 705 warn("Couldn't restrict write permissions to %s: %m", devnam); 706 } else 707 tty_mode = statbuf.st_mode; 708 709 /* 710 * Set line speed, flow control, etc. 711 * If we have a non-null connection or initializer script, 712 * on most systems we set CLOCAL for now so that we can talk 713 * to the modem before carrier comes up. But this has the 714 * side effect that we might miss it if CD drops before we 715 * get to clear CLOCAL below. On systems where we can talk 716 * successfully to the modem with CLOCAL clear and CD down, 717 * we could clear CLOCAL at this point. 718 */ 719 set_up_tty(ttyfd, ((connector != NULL && connector[0] != '\0') 720 || initializer != NULL)); 721 real_ttyfd = ttyfd; 722 } 723 724 /* 725 * If the pty, socket, notty and/or record option was specified, 726 * start up the character shunt now. 727 */ 728 status = EXIT_PTYCMD_FAILED; 729 if (ptycommand != NULL) { 730 if (record_file != NULL) { 731 int ipipe[2], opipe[2], ok; 732 733 if (pipe(ipipe) < 0 || pipe(opipe) < 0) 734 fatal("Couldn't create pipes for record option: %m"); 735 dbglog("starting charshunt for pty option"); 736 ok = device_script(ptycommand, opipe[0], ipipe[1], 1, 737 "record") == 0 && start_charshunt(ipipe[0], opipe[1]); 738 (void) close(ipipe[0]); 739 (void) close(ipipe[1]); 740 (void) close(opipe[0]); 741 (void) close(opipe[1]); 742 if (!ok) 743 goto fail; 744 } else { 745 if (device_script(ptycommand, pty_master, pty_master, 1, 746 "pty") < 0) 747 goto fail; 748 ttyfd = pty_slave; 749 (void) close(pty_master); 750 pty_master = -1; 751 } 752 } else if (pty_socket != NULL) { 753 int fd = open_socket(pty_socket); 754 if (fd < 0) 755 goto fail; 756 dbglog("starting charshunt for socket option"); 757 if (!start_charshunt(fd, fd)) 758 goto fail; 759 } else if (notty) { 760 dbglog("starting charshunt for notty option"); 761 if (!start_charshunt(0, 1)) 762 goto fail; 763 } else if (record_file != NULL) { 764 dbglog("starting charshunt for record option"); 765 if (!start_charshunt(ttyfd, ttyfd)) 766 goto fail; 767 } 768 769 /* run connection script */ 770 if (((connector != NULL) && (connector[0] != '\0')) || initializer) { 771 if (real_ttyfd != -1) { 772 /* XXX do this if doing_callback == CALLBACK_DIALIN? */ 773 if (!default_device && modem && !direct_tty) { 774 setdtr(real_ttyfd, 0); /* in case modem is off hook */ 775 (void) sleep(1); 776 setdtr(real_ttyfd, 1); 777 } 778 } 779 780 if ((initializer != NULL) && (initializer[0] != '\0')) { 781 if (device_script(initializer, ttyfd, ttyfd, 0, "init") < 0) { 782 error("Initializer script failed"); 783 status = EXIT_INIT_FAILED; 784 goto fail; 785 } 786 if (kill_link) 787 goto disconnect; 788 789 info("Serial port initialized."); 790 } 791 792 if ((connector != NULL) && (connector[0] != '\0')) { 793 if (device_script(connector, ttyfd, ttyfd, 0, "connect") < 0) { 794 error("Connect script failed"); 795 status = EXIT_CONNECT_FAILED; 796 goto fail; 797 } 798 if (kill_link) 799 goto disconnect; 800 801 info("Serial connection established."); 802 } 803 804 /* 805 * Clear CLOCAL if modem option -- we now have carrier 806 * established, and we should respect loss of carrier. 807 */ 808 if (real_ttyfd != -1) 809 set_up_tty(real_ttyfd, 0); 810 811 if (doing_callback == CALLBACK_DIALIN) 812 connector = NULL; 813 } 814 815 /* reopen tty if necessary to wait for carrier */ 816 if (connector == NULL && modem && devnam[0] != '\0' && !direct_tty) { 817 for (;;) { 818 if ((i = open(devnam, O_RDWR)) >= 0) 819 break; 820 if (errno != EINTR) { 821 error("Failed to reopen %s: %m", devnam); 822 status = EXIT_OPEN_FAILED; 823 } 824 if (!persist || errno != EINTR || hungup || kill_link) 825 goto fail; 826 } 827 (void) close(i); 828 } 829 830 (void) slprintf(numbuf, sizeof(numbuf), "%d", baud_rate); 831 script_setenv("SPEED", numbuf, 0); 832 833 /* run welcome script, if any */ 834 if ((welcomer != NULL) && (welcomer[0] != '\0')) { 835 if (device_script(welcomer, ttyfd, ttyfd, 0, "welcome") < 0) 836 warn("Welcome script failed"); 837 } 838 839 /* set up the serial device as a ppp interface */ 840 #ifdef HAVE_MULTILINK 841 (void) tdb_writelock(pppdb); 842 #endif 843 fd_ppp = establish_ppp(ttyfd); 844 if (fd_ppp < 0) { 845 #ifdef HAVE_MULTILINK 846 (void) tdb_writeunlock(pppdb); 847 #endif 848 status = EXIT_FATAL_ERROR; 849 goto disconnect; 850 } 851 852 if (!demand && ifunit >= 0) 853 set_ifunit(1); 854 #ifdef HAVE_MULTILINK 855 (void) tdb_writeunlock(pppdb); 856 #endif 857 858 /* 859 * Start opening the connection and wait for 860 * incoming events (reply, timeout, etc.). 861 */ 862 notice("Connect: %s <--> %s", ifname, ppp_devnam); 863 (void) gettimeofday(&start_time, NULL); 864 link_stats_valid = 0; 865 script_unsetenv("CONNECT_TIME"); 866 script_unsetenv("BYTES_SENT"); 867 script_unsetenv("BYTES_RCVD"); 868 lcp_lowerup(0); 869 870 /* Mostly for accounting purposes */ 871 new_phase(PHASE_CONNECTED); 872 873 /* 874 * If we are initiating this connection, wait for a short 875 * time for something from the peer. This can avoid bouncing 876 * our packets off its tty before it has set up the tty. 877 */ 878 add_fd(fd_ppp); 879 if (connect_delay != 0 && (connector != NULL || ptycommand != NULL)) { 880 struct timeval t; 881 t.tv_sec = connect_delay / 1000; 882 t.tv_usec = connect_delay % 1000; 883 wait_input(&t); 884 } 885 886 lcp_open(0); /* Start protocol */ 887 open_ccp_flag = 0; 888 status = EXIT_NEGOTIATION_FAILED; 889 new_phase(PHASE_ESTABLISH); 890 while (phase != PHASE_DEAD) { 891 if (sigsetjmp(sigjmp, 1) == 0) { 892 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); 893 if (kill_link || open_ccp_flag || got_sigchld) { 894 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 895 } else { 896 waiting = 1; 897 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 898 wait_input(timeleft(&timo)); 899 } 900 } 901 waiting = 0; 902 calltimeout(); 903 get_input(); 904 if (kill_link) { 905 lcp_close(0, "User request"); 906 kill_link = 0; 907 } 908 if (open_ccp_flag) { 909 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { 910 /* Uncloak ourselves. */ 911 ccp_fsm[0].flags &= ~OPT_SILENT; 912 (*ccp_protent.open)(0); 913 } 914 open_ccp_flag = 0; 915 } 916 if (got_sigchld) 917 (void) reap_kids(0); /* Don't leave dead kids lying around */ 918 } 919 920 /* 921 * Print connect time and statistics. 922 */ 923 if (link_stats_valid) { 924 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ 925 info("Connect time %d.%d minutes.", t/10, t%10); 926 info("Sent %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F 927 " packets), received %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F 928 " packets).", 929 link_stats.bytes_out, link_stats.pkts_out, 930 link_stats.bytes_in, link_stats.pkts_in); 931 } 932 933 /* 934 * Delete pid file before disestablishing ppp. Otherwise it 935 * can happen that another pppd gets the same unit and then 936 * we delete its pid file. 937 */ 938 if (!demand) { 939 if (pidfilename[0] != '\0' 940 && unlink(pidfilename) < 0 && errno != ENOENT) 941 warn("unable to delete pid file %s: %m", pidfilename); 942 pidfilename[0] = '\0'; 943 } 944 945 /* 946 * If we may want to bring the link up again, transfer 947 * the ppp unit back to the loopback. Set the 948 * real serial device back to its normal mode of operation. 949 */ 950 remove_fd(fd_ppp); 951 clean_check(); 952 if (demand) 953 restore_loop(); 954 disestablish_ppp(ttyfd); 955 fd_ppp = -1; 956 if (!hungup) 957 lcp_lowerdown(0); 958 if (!demand) 959 script_unsetenv("IFNAME"); 960 961 /* 962 * Run disconnector script, if requested. 963 * XXX we may not be able to do this if the line has hung up! 964 */ 965 disconnect: 966 if ((disconnect_script != NULL) && (disconnect_script[0] != '\0') && 967 !hungup) { 968 new_phase(PHASE_DISCONNECT); 969 if (real_ttyfd >= 0) 970 set_up_tty(real_ttyfd, 1); 971 if (device_script(disconnect_script, ttyfd, ttyfd, 0, 972 "disconnect") < 0) { 973 warn("disconnect script failed"); 974 } else { 975 info("Serial link disconnected."); 976 } 977 } 978 979 fail: 980 if (pty_master >= 0) 981 (void) close(pty_master); 982 if (pty_slave >= 0) { 983 (void) close(pty_slave); 984 pty_slave = -1; 985 } 986 if (real_ttyfd >= 0) 987 close_tty(); 988 if (locked) { 989 locked = 0; 990 unlock(); 991 } 992 993 if (!demand) { 994 if (pidfilename[0] != '\0' 995 && unlink(pidfilename) < 0 && errno != ENOENT) 996 warn("unable to delete pid file %s: %m", pidfilename); 997 pidfilename[0] = '\0'; 998 } 999 1000 if (!persist || (maxfail > 0 && unsuccess >= maxfail)) 1001 break; 1002 1003 kill_link = 0; 1004 if (demand) 1005 demand_discard(); 1006 t = need_holdoff? holdoff: 0; 1007 if (holdoff_hook != NULL) 1008 t = (*holdoff_hook)(); 1009 if (t > 0) { 1010 new_phase(PHASE_HOLDOFF); 1011 TIMEOUT(holdoff_end, NULL, t); 1012 do { 1013 if (sigsetjmp(sigjmp, 1) == 0) { 1014 (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); 1015 if (kill_link || got_sigchld) { 1016 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 1017 } else { 1018 waiting = 1; 1019 (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); 1020 wait_input(timeleft(&timo)); 1021 } 1022 } 1023 waiting = 0; 1024 calltimeout(); 1025 if (kill_link) { 1026 kill_link = 0; 1027 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ 1028 } 1029 if (got_sigchld) 1030 (void) reap_kids(0); 1031 } while (phase == PHASE_HOLDOFF); 1032 if (!persist) 1033 break; 1034 } 1035 } 1036 1037 /* Wait for scripts to finish */ 1038 final_reap(); 1039 1040 die(status); 1041 return (0); 1042 } 1043 1044 /* 1045 * setup_signals - initialize signal handling. 1046 */ 1047 static void 1048 setup_signals() 1049 { 1050 struct sigaction sa; 1051 1052 /* 1053 * Compute mask of all interesting signals and install signal handlers 1054 * for each. Only one signal handler may be active at a time. Therefore, 1055 * all other signals should be masked when any handler is executing. 1056 */ 1057 (void) sigemptyset(&main_sigmask); 1058 (void) sigaddset(&main_sigmask, SIGHUP); 1059 (void) sigaddset(&main_sigmask, SIGINT); 1060 (void) sigaddset(&main_sigmask, SIGTERM); 1061 (void) sigaddset(&main_sigmask, SIGCHLD); 1062 (void) sigaddset(&main_sigmask, SIGUSR2); 1063 1064 #define SIGNAL(s, handler) if (1) { \ 1065 sa.sa_handler = handler; \ 1066 if (sigaction(s, &sa, NULL) < 0) \ 1067 fatal("Couldn't establish signal handler (%d): %m", s); \ 1068 } else ((void)0) 1069 1070 sa.sa_mask = main_sigmask; 1071 sa.sa_flags = 0; 1072 /*CONSTANTCONDITION*/ SIGNAL(SIGHUP, hup); /* Hangup */ 1073 /*CONSTANTCONDITION*/ SIGNAL(SIGINT, term); /* Interrupt */ 1074 /*CONSTANTCONDITION*/ SIGNAL(SIGTERM, term); /* Terminate */ 1075 /*CONSTANTCONDITION*/ SIGNAL(SIGCHLD, chld); 1076 1077 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ 1078 /*CONSTANTCONDITION*/ SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ 1079 1080 /* 1081 * Install a handler for other signals which would otherwise 1082 * cause pppd to exit without cleaning up. 1083 */ 1084 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, bad_signal); 1085 /*CONSTANTCONDITION*/ SIGNAL(SIGQUIT, bad_signal); 1086 1087 /* Do not hook any of these signals on Solaris; allow core dump instead */ 1088 #ifndef SOL2 1089 /*CONSTANTCONDITION*/ SIGNAL(SIGABRT, bad_signal); 1090 /*CONSTANTCONDITION*/ SIGNAL(SIGFPE, bad_signal); 1091 /*CONSTANTCONDITION*/ SIGNAL(SIGILL, bad_signal); 1092 #ifndef DEBUG 1093 /*CONSTANTCONDITION*/ SIGNAL(SIGSEGV, bad_signal); 1094 #endif 1095 #ifdef SIGBUS 1096 /*CONSTANTCONDITION*/ SIGNAL(SIGBUS, bad_signal); 1097 #endif 1098 #ifdef SIGEMT 1099 /*CONSTANTCONDITION*/ SIGNAL(SIGEMT, bad_signal); 1100 #endif 1101 #ifdef SIGPOLL 1102 /*CONSTANTCONDITION*/ SIGNAL(SIGPOLL, bad_signal); 1103 #endif 1104 #ifdef SIGPROF 1105 /*CONSTANTCONDITION*/ SIGNAL(SIGPROF, bad_signal); 1106 #endif 1107 #ifdef SIGSYS 1108 /*CONSTANTCONDITION*/ SIGNAL(SIGSYS, bad_signal); 1109 #endif 1110 #ifdef SIGTRAP 1111 /*CONSTANTCONDITION*/ SIGNAL(SIGTRAP, bad_signal); 1112 #endif 1113 #ifdef SIGVTALRM 1114 /*CONSTANTCONDITION*/ SIGNAL(SIGVTALRM, bad_signal); 1115 #endif 1116 #ifdef SIGXCPU 1117 /*CONSTANTCONDITION*/ SIGNAL(SIGXCPU, bad_signal); 1118 #endif 1119 #ifdef SIGXFSZ 1120 /*CONSTANTCONDITION*/ SIGNAL(SIGXFSZ, bad_signal); 1121 #endif 1122 #endif 1123 1124 /* 1125 * Apparently we can get a SIGPIPE when we call syslog, if 1126 * syslogd has died and been restarted. Ignoring it seems 1127 * be sufficient. 1128 */ 1129 (void) signal(SIGPIPE, SIG_IGN); 1130 } 1131 1132 /* 1133 * set_ifunit - do things we need to do once we know which ppp 1134 * unit we are using. 1135 */ 1136 void 1137 set_ifunit(iskey) 1138 int iskey; 1139 { 1140 sys_ifname(); 1141 info("Using interface %s", ifname); 1142 script_setenv("IFNAME", ifname, iskey); 1143 if (iskey) { 1144 create_pidfile(); /* write pid to file */ 1145 create_linkpidfile(); 1146 } 1147 } 1148 1149 /* 1150 * detach - detach us from the controlling terminal. 1151 */ 1152 void 1153 detach() 1154 { 1155 pid_t pid; 1156 char numbuf[16]; 1157 1158 if (detached) 1159 return; 1160 if ((pid = fork()) == (pid_t)-1) { 1161 error("Couldn't detach (fork failed: %m)"); 1162 die(1); /* or just return? */ 1163 } 1164 if (pid != (pid_t)0) { 1165 /* parent */ 1166 if (locked) 1167 (void) relock(pid); 1168 exit(0); /* parent dies */ 1169 } 1170 (void) setsid(); 1171 /* 1172 * Fork again to relinquish session leadership. This is needed 1173 * to prevent the daemon from acquiring controlling terminal. 1174 */ 1175 if ((pid = fork()) == (pid_t)-1) { 1176 error("Couldn't detach (second fork failed: %m)"); 1177 die(1); /* or just return? */ 1178 } 1179 if (pid != (pid_t)0) { 1180 /* parent */ 1181 if (locked) 1182 (void) relock(pid); 1183 exit(0); /* parent dies */ 1184 } 1185 (void) chdir("/"); 1186 (void) close(0); 1187 (void) close(1); 1188 (void) close(2); 1189 detached = 1; 1190 if (!log_to_file && !log_to_specific_fd) 1191 log_to_fd = -1; 1192 /* update pid files if they have been written already */ 1193 if (pidfilename[0] != '\0') 1194 create_pidfile(); 1195 if (linkpidfile[0] != '\0') 1196 create_linkpidfile(); 1197 (void) slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 1198 script_setenv("PPPD_PID", numbuf, 1); 1199 } 1200 1201 /* 1202 * reopen_log - (re)open our connection to syslog. 1203 */ 1204 void 1205 reopen_log() 1206 { 1207 #ifdef ULTRIX 1208 openlog("pppd", LOG_PID); 1209 #else 1210 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); 1211 (void) setlogmask(LOG_UPTO(LOG_INFO)); 1212 #endif 1213 } 1214 1215 /* 1216 * Create a file containing our process ID. 1217 */ 1218 static void 1219 create_pidfile() 1220 { 1221 FILE *pidfile; 1222 1223 (void) slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", 1224 _PATH_VARRUN, ifname); 1225 if ((pidfile = fopen(pidfilename, "w")) != NULL) { 1226 (void) fprintf(pidfile, "%u\n", (unsigned)getpid()); 1227 (void) fclose(pidfile); 1228 } else { 1229 error("Failed to create pid file %s: %m", pidfilename); 1230 pidfilename[0] = '\0'; 1231 } 1232 } 1233 1234 static void 1235 create_linkpidfile() 1236 { 1237 FILE *pidfile; 1238 1239 if (linkname[0] == '\0') 1240 return; 1241 script_setenv("LINKNAME", linkname, 1); 1242 (void) slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", 1243 _PATH_VARRUN, linkname); 1244 if ((pidfile = fopen(linkpidfile, "w")) != NULL) { 1245 (void) fprintf(pidfile, "%u\n", (unsigned)getpid()); 1246 if (ifname[0] != '\0') 1247 (void) fprintf(pidfile, "%s\n", ifname); 1248 (void) fclose(pidfile); 1249 } else { 1250 error("Failed to create pid file %s: %m", linkpidfile); 1251 linkpidfile[0] = '\0'; 1252 } 1253 } 1254 1255 /* 1256 * holdoff_end - called via a timeout when the holdoff period ends. 1257 */ 1258 /*ARGSUSED*/ 1259 static void 1260 holdoff_end(arg) 1261 void *arg; 1262 { 1263 new_phase(PHASE_DORMANT); 1264 } 1265 1266 /* List of protocol names, to make our messages a little more informative. */ 1267 struct protocol_list { 1268 u_short proto; 1269 const char *name; 1270 } protocol_list[] = { 1271 { 0x21, "IP" }, 1272 { 0x23, "OSI Network Layer" }, 1273 { 0x25, "Xerox NS IDP" }, 1274 { 0x27, "DECnet Phase IV" }, 1275 { 0x29, "Appletalk" }, 1276 { 0x2b, "Novell IPX" }, 1277 { 0x2d, "VJ compressed TCP/IP" }, 1278 { 0x2f, "VJ uncompressed TCP/IP" }, 1279 { 0x31, "Bridging PDU" }, 1280 { 0x33, "Stream Protocol ST-II" }, 1281 { 0x35, "Banyan Vines" }, 1282 { 0x37, "Old VJ compressed TCP/IP" }, 1283 { 0x39, "AppleTalk EDDP" }, 1284 { 0x3b, "AppleTalk SmartBuffered" }, 1285 { 0x3d, "Multilink" }, 1286 { 0x3f, "NetBIOS Frame" }, 1287 { 0x41, "Cisco LAN Extension" }, 1288 { 0x43, "Ascom Timeplex" }, 1289 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 1290 { 0x47, "DCA Remote Lan" }, 1291 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, 1292 { 0x4b, "SNA over 802.2" }, 1293 { 0x4d, "SNA" }, 1294 { 0x4f, "IP6 Header Compression" }, 1295 { 0x51, "KNX Bridging" }, 1296 { 0x53, "Encrypted" }, 1297 { 0x55, "per-link encrypted" }, 1298 { 0x57, "IPv6" }, 1299 { 0x59, "PPP Muxing" }, 1300 { 0x6f, "Stampede Bridging" }, 1301 { 0x73, "MP+" }, 1302 { 0xc1, "STMF" }, 1303 { 0xfb, "per-link compressed" }, 1304 { 0xfd, "compressed datagram" }, 1305 { 0x0201, "802.1d Hello Packets" }, 1306 { 0x0203, "IBM Source Routing BPDU" }, 1307 { 0x0205, "DEC LANBridge100 Spanning Tree" }, 1308 { 0x0207, "Cisco Discovery Protocol" }, 1309 { 0x0231, "Luxcom" }, 1310 { 0x0233, "Sigma Network Systems" }, 1311 { 0x0235, "Apple Client Server Protocol" }, 1312 { 0x0281, "MPLS Unicast" }, 1313 { 0x0283, "MPLS Multicast" }, 1314 { 0x0285, "IEEE p1284.4" }, 1315 { 0x0287, "ETSI TETRA TNP1" }, 1316 { 0x4021, "Stacker LZS" }, 1317 { 0x8021, "Internet Protocol Control Protocol" }, 1318 { 0x8023, "OSI Network Layer Control Protocol" }, 1319 { 0x8025, "Xerox NS IDP Control Protocol" }, 1320 { 0x8027, "DECnet Phase IV Control Protocol" }, 1321 { 0x8029, "Appletalk Control Protocol" }, 1322 { 0x802b, "Novell IPX Control Protocol" }, 1323 { 0x8031, "Bridging Control Protocol" }, 1324 { 0x8033, "Stream Protocol Control Protocol" }, 1325 { 0x8035, "Banyan Vines Control Protocol" }, 1326 { 0x803f, "NetBIOS Frames Control Protocol" }, 1327 { 0x8041, "Cisco LAN Extension Control Protocol" }, 1328 { 0x8043, "Ascom Timeplex Control Protocol" }, 1329 { 0x8045, "Fujitsu LBLB Control Protocol" }, 1330 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 1331 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 1332 { 0x804b, "SNA over 802.2 Control Protocol" }, 1333 { 0x804d, "SNA Control Protocol" }, 1334 { 0x8051, "KNX Bridging Control Protocol" }, 1335 { 0x8053, "Encryption Control Protocol" }, 1336 { 0x8055, "Per-link Encryption Control Protocol" }, 1337 { 0x8057, "IPv6 Control Protocol" }, 1338 { 0x806f, "Stampede Bridging Control Protocol" }, 1339 { 0x80c1, "STMF Control Protocol" }, 1340 { 0x80fb, "Per-link Compression Control Protocol" }, 1341 { 0x80fd, "Compression Control Protocol" }, 1342 { 0x8207, "Cisco Discovery Control Protocol" }, 1343 { 0x8235, "Apple Client Server Control Protocol" }, 1344 { 0x8281, "MPLS Control Protocol" }, 1345 { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, 1346 { 0xc021, "Link Control Protocol" }, 1347 { 0xc023, "Password Authentication Protocol" }, 1348 { 0xc025, "Link Quality Report" }, 1349 { 0xc027, "Shiva Password Authentication Protocol" }, 1350 { 0xc029, "CallBack Control Protocol (CBCP)" }, 1351 { 0xc02b, "Bandwidth Allocation Control Protocol" }, 1352 { 0xc02d, "BAP" }, 1353 { 0xc081, "Container Control Protocol" }, 1354 { 0xc223, "Challenge Handshake Authentication Protocol" }, 1355 { 0xc227, "Extensible Authentication Protocol" }, 1356 { 0xc281, "Funk Proprietary Authentication Protocol" }, 1357 { 0, NULL }, 1358 }; 1359 1360 /* 1361 * protocol_name - find a name for a PPP protocol. 1362 */ 1363 const char * 1364 protocol_name(proto) 1365 int proto; 1366 { 1367 struct protocol_list *lp; 1368 1369 for (lp = protocol_list; lp->proto != 0; ++lp) 1370 if (proto == lp->proto) 1371 return (lp->name); 1372 return (NULL); 1373 } 1374 1375 static const char *phase_names[] = { PHASE__NAMES }; 1376 1377 const char * 1378 phase_name(pval) 1379 int pval; 1380 { 1381 static char buf[32]; 1382 1383 if (pval < 0 || pval >= Dim(phase_names)) { 1384 (void) slprintf(buf, sizeof (buf), "unknown %d", pval); 1385 return ((const char *)buf); 1386 } 1387 return (phase_names[pval]); 1388 } 1389 1390 /* 1391 * get_input - called when incoming data is available. 1392 */ 1393 static void 1394 get_input() 1395 { 1396 int len, i; 1397 u_char *p; 1398 u_short protocol; 1399 struct protent *protp; 1400 const char *pname; 1401 1402 p = inpacket_buf; /* point to beginning of packet buffer */ 1403 1404 len = read_packet(inpacket_buf); 1405 if (len < 0) 1406 return; 1407 1408 if (len == 0) { 1409 notice("Modem hangup"); 1410 hungup = 1; 1411 status = EXIT_HANGUP; 1412 lcp_lowerdown(0); /* serial link is no longer available */ 1413 link_terminated(0); 1414 return; 1415 } 1416 1417 if (debug /*&& (debugflags & DBG_INPACKET)*/) 1418 dbglog("rcvd %P", p, len); 1419 1420 if (len < PPP_HDRLEN) { 1421 dbglog("Discarded short packet (%d < %d)", len, PPP_HDRLEN); 1422 return; 1423 } 1424 1425 p += 2; /* Skip address and control */ 1426 GETSHORT(protocol, p); 1427 len -= PPP_HDRLEN; 1428 1429 pname = debug ? NULL : protocol_name(protocol); 1430 1431 /* 1432 * Toss all non-LCP packets unless LCP is in Opened state and 1433 * discard non-authentication protocols if we're not yet 1434 * authenticated. 1435 */ 1436 if ((protocol != PPP_LCP && 1437 (phase < PHASE_AUTHENTICATE || phase > PHASE_RUNNING)) || 1438 (phase <= PHASE_AUTHENTICATE && 1439 !(protocol == PPP_LCP || protocol == PPP_LQR || 1440 protocol == PPP_PAP || protocol == PPP_CHAP))) { 1441 if (pname == NULL) 1442 dbglog("Discarded proto 0x%x in %s phase", 1443 protocol, phase_name(phase)); 1444 else 1445 dbglog("Discarded %s (0x%x) in %s phase", 1446 pname, protocol, phase_name(phase)); 1447 return; 1448 } 1449 1450 /* 1451 * Upcall the proper protocol input routine. 1452 */ 1453 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 1454 if (protp->protocol == protocol && protp->enabled_flag) { 1455 (*protp->input)(0, p, len); 1456 return; 1457 } 1458 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag 1459 && protp->datainput != NULL) { 1460 (*protp->datainput)(0, p, len); 1461 return; 1462 } 1463 } 1464 1465 if (debug) { 1466 if (pname != NULL) 1467 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); 1468 else 1469 warn("Unsupported protocol 0x%x received", protocol); 1470 } 1471 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); 1472 } 1473 1474 /* 1475 * new_phase - signal the start of a new phase of pppd's operation. 1476 */ 1477 void 1478 new_phase(p) 1479 int p; 1480 { 1481 if (new_phase_hook != NULL) 1482 (*new_phase_hook)(p, phase); 1483 phase = p; 1484 } 1485 1486 /* 1487 * die - clean up state and exit with the specified status. 1488 */ 1489 void 1490 die(status) 1491 int status; 1492 { 1493 cleanup(); 1494 if (phase != PHASE_EXIT) { 1495 syslog(LOG_INFO, "Exit."); 1496 new_phase(PHASE_EXIT); 1497 } 1498 exit(status); 1499 } 1500 1501 /* 1502 * cleanup - restore anything which needs to be restored before we exit 1503 */ 1504 static void 1505 cleanup() 1506 { 1507 sys_cleanup(); /* XXX: Need to check if this is okay after close_tty */ 1508 1509 if (fd_ppp >= 0) { 1510 fd_ppp = -1; 1511 disestablish_ppp(ttyfd); 1512 } 1513 if (real_ttyfd >= 0) 1514 close_tty(); 1515 1516 if (pidfilename[0] != '\0' && unlink(pidfilename) < 0 && errno != ENOENT) 1517 warn("unable to delete pid file %s: %m", pidfilename); 1518 pidfilename[0] = '\0'; 1519 if (linkpidfile[0] != '\0' && unlink(linkpidfile) < 0 && errno != ENOENT) 1520 warn("unable to delete pid file %s: %m", linkpidfile); 1521 linkpidfile[0] = '\0'; 1522 1523 if (locked) { 1524 locked = 0; 1525 unlock(); 1526 } 1527 1528 #ifdef HAVE_MULTILINK 1529 if (pppdb != NULL) { 1530 cleanup_db(); 1531 pppdb = NULL; 1532 } 1533 #endif 1534 } 1535 1536 /* 1537 * close_tty - restore the terminal device and close it. 1538 */ 1539 static void 1540 close_tty() 1541 { 1542 int fd = real_ttyfd; 1543 1544 real_ttyfd = -1; 1545 1546 /* drop dtr to hang up */ 1547 if (!default_device && modem) { 1548 setdtr(fd, 0); 1549 /* 1550 * This sleep is in case the serial port has CLOCAL set by default, 1551 * and consequently will reassert DTR when we close the device. 1552 */ 1553 (void) sleep(1); 1554 } 1555 1556 restore_tty(fd); 1557 1558 if (tty_mode != (mode_t) -1) { 1559 if (fchmod(fd, tty_mode) != 0) { 1560 /* XXX if devnam is a symlink, this will change the link */ 1561 if (chmod(devnam, tty_mode) != 0) { 1562 error("Unable to chmod file %s: %m", devnam); 1563 } 1564 } 1565 } 1566 1567 (void) close(fd); 1568 } 1569 1570 /* 1571 * update_link_stats - get stats at link termination. 1572 */ 1573 void 1574 update_link_stats(u) 1575 int u; 1576 { 1577 struct timeval now; 1578 char numbuf[32]; 1579 1580 if (gettimeofday(&now, NULL) >= 0) { 1581 link_connect_time = now.tv_sec - start_time.tv_sec; 1582 (void) slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time); 1583 script_setenv("CONNECT_TIME", numbuf, 0); 1584 } else { 1585 link_connect_time = 0; 1586 } 1587 1588 if (get_ppp_stats(u, &link_stats)) { 1589 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, 1590 link_stats.bytes_out); 1591 script_setenv("BYTES_SENT", numbuf, 0); 1592 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, 1593 link_stats.bytes_in); 1594 script_setenv("BYTES_RCVD", numbuf, 0); 1595 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, 1596 link_stats.pkts_in); 1597 script_setenv("PKTS_RCVD", numbuf, 0); 1598 (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, 1599 link_stats.pkts_out); 1600 script_setenv("PKTS_SENT", numbuf, 0); 1601 link_stats_valid = 1; 1602 } 1603 } 1604 1605 1606 struct callout { 1607 struct timeval c_time; /* time at which to call routine */ 1608 void *c_arg; /* argument to routine */ 1609 void (*c_func) __P((void *)); /* routine */ 1610 struct callout *c_next; 1611 }; 1612 1613 static struct callout *callout = NULL; /* Callout list */ 1614 static struct timeval timenow; /* Current time */ 1615 1616 /* 1617 * timeout - Schedule a timeout. 1618 * 1619 * Note that this timeout takes the number of seconds, NOT hz (as in 1620 * the kernel). 1621 */ 1622 void 1623 timeout(func, arg, time) 1624 void (*func) __P((void *)); 1625 void *arg; 1626 int time; 1627 { 1628 struct callout *newp, *p, **pp; 1629 1630 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time)); 1631 1632 /* 1633 * Allocate timeout. 1634 */ 1635 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) 1636 novm("callout structure for timeout."); 1637 newp->c_arg = arg; 1638 newp->c_func = func; 1639 (void) gettimeofday(&timenow, NULL); 1640 newp->c_time.tv_sec = timenow.tv_sec + time; 1641 newp->c_time.tv_usec = timenow.tv_usec; 1642 1643 /* 1644 * Find correct place and link it in. 1645 */ 1646 for (pp = &callout; (p = *pp) != NULL; pp = &p->c_next) 1647 if (newp->c_time.tv_sec < p->c_time.tv_sec 1648 || (newp->c_time.tv_sec == p->c_time.tv_sec 1649 && newp->c_time.tv_usec < p->c_time.tv_usec)) 1650 break; 1651 newp->c_next = p; 1652 *pp = newp; 1653 } 1654 1655 1656 /* 1657 * untimeout - Unschedule a timeout. 1658 */ 1659 void 1660 untimeout(func, arg) 1661 void (*func) __P((void *)); 1662 void *arg; 1663 { 1664 struct callout **copp, *freep; 1665 1666 MAINDEBUG(("Untimeout %p:%p.", func, arg)); 1667 1668 /* 1669 * Find first matching timeout and remove it from the list. 1670 */ 1671 for (copp = &callout; (freep = *copp) != NULL; copp = &freep->c_next) 1672 if (freep->c_func == func && freep->c_arg == arg) { 1673 *copp = freep->c_next; 1674 free((char *) freep); 1675 break; 1676 } 1677 } 1678 1679 1680 /* 1681 * calltimeout - Call any timeout routines which are now due. 1682 */ 1683 static void 1684 calltimeout() 1685 { 1686 struct callout *p; 1687 1688 while (callout != NULL) { 1689 p = callout; 1690 1691 if (gettimeofday(&timenow, NULL) < 0) 1692 fatal("Failed to get time of day: %m"); 1693 if (!(p->c_time.tv_sec < timenow.tv_sec 1694 || (p->c_time.tv_sec == timenow.tv_sec 1695 && p->c_time.tv_usec <= timenow.tv_usec))) 1696 break; /* no, it's not time yet */ 1697 1698 callout = p->c_next; 1699 (*p->c_func)(p->c_arg); 1700 1701 free((char *) p); 1702 } 1703 } 1704 1705 1706 /* 1707 * timeleft - return the length of time until the next timeout is due. 1708 */ 1709 static struct timeval * 1710 timeleft(tvp) 1711 struct timeval *tvp; 1712 { 1713 if (callout == NULL) 1714 return (NULL); 1715 1716 (void) gettimeofday(&timenow, NULL); 1717 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; 1718 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; 1719 if (tvp->tv_usec < 0) { 1720 tvp->tv_usec += 1000000; 1721 tvp->tv_sec -= 1; 1722 } 1723 if (tvp->tv_sec < 0) 1724 tvp->tv_sec = tvp->tv_usec = 0; 1725 1726 return (tvp); 1727 } 1728 1729 1730 /* 1731 * kill_my_pg - send a signal to our process group, and ignore it ourselves. 1732 */ 1733 static void 1734 kill_my_pg(sig) 1735 int sig; 1736 { 1737 struct sigaction act, oldact; 1738 sigset_t mask; 1739 1740 BZERO(&act, sizeof (act)); 1741 act.sa_handler = SIG_IGN; 1742 (void) sigemptyset(&mask); 1743 (void) sigaddset(&mask, sig); 1744 /* 1745 * Ignore signal 'sig' temporarily, before finally re-activating the 1746 * original handler. We need to do it in the following sequence, since 1747 * otherwise the signal handler for 'sig' will be called forever. 1748 */ 1749 if (sigaction(sig, &act, &oldact) < 0) { 1750 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig); 1751 } 1752 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL); 1753 /* 1754 * Send signal 'sig' to all processes whose process group ID is equal 1755 * to the process group ID of the sender. 1756 */ 1757 (void) kill(0, sig); 1758 if (sigaction(sig, &oldact, NULL) < 0) { 1759 fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig); 1760 } 1761 } 1762 1763 1764 /* 1765 * hup - Catch SIGHUP signal. 1766 * 1767 * Indicates that the physical layer has been disconnected. 1768 * We don't rely on this indication; if the user has sent this 1769 * signal, we just take the link down. 1770 */ 1771 static void 1772 hup(sig) 1773 int sig; 1774 { 1775 info("Hangup (SIGHUP)"); 1776 kill_link = 1; 1777 if (status != EXIT_HANGUP) 1778 status = EXIT_USER_REQUEST; 1779 if (conn_running > 0) 1780 /* Send the signal to the [dis]connector process(es) also */ 1781 kill_my_pg(sig); 1782 if (charshunt_pid) 1783 (void) kill(charshunt_pid, sig); 1784 if (waiting) 1785 siglongjmp(sigjmp, 1); 1786 } 1787 1788 1789 /* 1790 * term - Catch SIGTERM signal and SIGINT signal (^C/del). 1791 * 1792 * Indicates that we should initiate a graceful disconnect and exit. 1793 */ 1794 /*ARGSUSED*/ 1795 static void 1796 term(sig) 1797 int sig; 1798 { 1799 info("Terminating on signal %d.", sig); 1800 persist = 0; /* don't try to restart */ 1801 kill_link = 1; 1802 status = EXIT_USER_REQUEST; 1803 if (conn_running > 0) 1804 /* Send the signal to the [dis]connector process(es) also */ 1805 kill_my_pg(sig); 1806 if (charshunt_pid) 1807 (void) kill(charshunt_pid, sig); 1808 if (waiting) 1809 siglongjmp(sigjmp, 1); 1810 } 1811 1812 1813 /* 1814 * chld - Catch SIGCHLD signal. 1815 * Sets a flag so we will call reap_kids in the mainline. 1816 */ 1817 /*ARGSUSED*/ 1818 static void 1819 chld(sig) 1820 int sig; 1821 { 1822 got_sigchld = 1; 1823 if (waiting) 1824 siglongjmp(sigjmp, 1); 1825 } 1826 1827 /* 1828 * toggle_debug - Catch SIGUSR1 signal. 1829 * 1830 * Toggle debug flag. 1831 */ 1832 /*ARGSUSED*/ 1833 static void 1834 toggle_debug(sig) 1835 int sig; 1836 { 1837 if (debug) { 1838 print_ncpstate(0, NULL); 1839 dbglog("debug logging disabled"); 1840 (void) setlogmask(LOG_UPTO(LOG_WARNING)); 1841 debug = 0; 1842 } else { 1843 (void) setlogmask(LOG_UPTO(LOG_DEBUG)); 1844 dbglog("debug logging enabled"); 1845 print_ncpstate(0, NULL); 1846 debug = 1; 1847 } 1848 } 1849 1850 1851 /* 1852 * open_ccp - Catch SIGUSR2 signal. 1853 * 1854 * Try to (re)negotiate compression. 1855 */ 1856 /*ARGSUSED*/ 1857 static void 1858 open_ccp(sig) 1859 int sig; 1860 { 1861 open_ccp_flag = 1; 1862 if (waiting) 1863 siglongjmp(sigjmp, 1); 1864 } 1865 1866 1867 /* 1868 * bad_signal - We've caught a fatal signal. Clean up state and exit. 1869 */ 1870 static void 1871 bad_signal(sig) 1872 int sig; 1873 { 1874 static int crashed = 0; 1875 1876 if (crashed) 1877 _exit(127); 1878 crashed = 1; 1879 error("Fatal signal %d", sig); 1880 if (conn_running > 0) 1881 kill_my_pg(SIGTERM); 1882 if (charshunt_pid) 1883 (void) kill(charshunt_pid, SIGTERM); 1884 die(127); 1885 } 1886 1887 1888 /* 1889 * device_script - run a program to talk to the serial device 1890 * (e.g. to run the connector or disconnector script). 1891 */ 1892 static int 1893 device_script(program, in, out, dont_wait, optname) 1894 char *program; 1895 int in, out; 1896 int dont_wait; 1897 char *optname; 1898 { 1899 pid_t pid; 1900 int status = -1; 1901 int errfd; 1902 int envpipe[2]; 1903 1904 envpipe[0] = envpipe[1] = -1; 1905 if (!dont_wait && device_pipe_hook != NULL && pipe(envpipe) == -1) { 1906 error("Cannot create pipe for child: %m"); 1907 return (-1); 1908 } 1909 1910 ++conn_running; 1911 pid = fork(); 1912 1913 if (pid == (pid_t)-1) { 1914 --conn_running; 1915 error("Failed to create child process: %m"); 1916 return (-1); 1917 } 1918 1919 if (pid == (pid_t)0) { 1920 sys_close(); 1921 closelog(); 1922 if (envpipe[0] >= 0) { 1923 if (envpipe[1] <= 2) 1924 envpipe[1] = dup(envpipe[1]); 1925 (void) close(envpipe[0]); 1926 } 1927 if (in == 2) { 1928 /* aargh!!! */ 1929 int newin = dup(in); 1930 if (in == out) 1931 out = newin; 1932 in = newin; 1933 } else if (out == 2) { 1934 out = dup(out); 1935 } 1936 if (log_to_fd >= 0) { 1937 if (log_to_fd != 2) { 1938 if (dup2(log_to_fd, 2) < 0) 1939 error("dup2(log_to_fd, STDERR) failed: %m"); 1940 } 1941 } else { 1942 (void) close(2); 1943 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); 1944 if (errfd >= 0 && errfd != 2) { 1945 if (dup2(errfd, 2) < 0) 1946 error("dup2(errfd, STDERR) failed: %m"); 1947 (void) close(errfd); 1948 } 1949 } 1950 if (in != 0) { 1951 if (out == 0) 1952 out = dup(out); 1953 if (dup2(in, 0) < 0) 1954 error("dup2(in, STDIN) failed: %m"); 1955 } 1956 if (out != 1) { 1957 if (dup2(out, 1) < 0) 1958 error("dup2(out, STDOUT) failed: %m"); 1959 } 1960 if (envpipe[0] >= 0 && dup2(envpipe[1], 3) < 0) 1961 error("dup2(pipe, pipeout) failed: %m"); 1962 if (real_ttyfd > 2) 1963 (void) close(real_ttyfd); 1964 if (pty_master > 2) 1965 (void) close(pty_master); 1966 if (pty_slave > 2) { 1967 (void) close(pty_slave); 1968 pty_slave = -1; 1969 } 1970 (void) setuid(uid); 1971 if (getuid() != uid) { 1972 error("setuid failed"); 1973 exit(1); 1974 } 1975 (void) setgid(getgid()); 1976 if (script_env != NULL) { 1977 while (*script_env != NULL) { 1978 if (putenv(*script_env) == -1) 1979 warn("unable to set %s for %s: %m", *script_env, program); 1980 script_env++; 1981 } 1982 } 1983 (void) execl("/bin/sh", "sh", "-c", program, (char *)0); 1984 error("could not exec /bin/sh: %m"); 1985 exit(99); 1986 /* NOTREACHED */ 1987 } 1988 1989 if (debug) 1990 dbglog("%s option: '%s' started (pid %d)", optname, program, pid); 1991 if (dont_wait) { 1992 record_child(pid, program, NULL, NULL); 1993 status = 0; 1994 } else { 1995 if (envpipe[0] >= 0) { 1996 (void) close(envpipe[1]); 1997 (*device_pipe_hook)(envpipe[0]); 1998 } 1999 while (waitpid(pid, &status, 0) < 0) { 2000 if (errno == EINTR) 2001 continue; 2002 fatal("error waiting for (dis)connection process: %m"); 2003 } 2004 if (envpipe[0] >= 0) 2005 (void) close(envpipe[0]); 2006 --conn_running; 2007 } 2008 2009 return (status == 0 ? 0 : -1); 2010 } 2011 2012 2013 /* 2014 * run-program - execute a program with given arguments, 2015 * but don't wait for it. 2016 * If the program can't be executed, logs an error unless 2017 * must_exist is 0 and the program file doesn't exist. 2018 * Returns -1 if it couldn't fork, 0 if the file doesn't exist 2019 * or isn't an executable plain file, or the process ID of the child. 2020 * If done != NULL, (*done)(arg, int) will be called later (within 2021 * reap_kids) if this routine returns value > 0. 2022 */ 2023 pid_t 2024 run_program(prog, args, must_exist, done, arg) 2025 char *prog; 2026 char **args; 2027 int must_exist; 2028 void (*done) __P((void *arg, int status)); 2029 void *arg; 2030 { 2031 pid_t pid; 2032 struct stat sbuf; 2033 int retv; 2034 2035 /* 2036 * First check if the file exists and is executable. 2037 * We don't use access() because that would use the 2038 * real user-id, which might not be root, and the script 2039 * might be accessible only to root. 2040 */ 2041 errno = EINVAL; 2042 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) 2043 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { 2044 if (must_exist || errno != ENOENT) 2045 warn("Can't execute %s: %m", prog); 2046 return (0); 2047 } 2048 2049 if (updown_script_hook != NULL) { 2050 retv = (*updown_script_hook)((const char ***)&args); 2051 if (retv == -1) { 2052 return (-1); 2053 } 2054 } 2055 2056 pid = fork(); 2057 if (pid == (pid_t)-1) { 2058 error("Failed to create child process for %s: %m", prog); 2059 return (-1); 2060 } 2061 if (pid == (pid_t)0) { 2062 int new_fd; 2063 2064 /* Leave the current location */ 2065 (void) setsid(); /* No controlling tty. */ 2066 (void) umask (S_IRWXG|S_IRWXO); 2067 (void) chdir ("/"); /* no current directory. */ 2068 (void) setuid(0); /* set real UID = root */ 2069 (void) setgid(getegid()); 2070 2071 /* Ensure that nothing of our device environment is inherited. */ 2072 sys_close(); 2073 closelog(); 2074 (void) close(0); 2075 (void) close(1); 2076 (void) close(2); 2077 (void) close(ttyfd); /* tty interface to the ppp device */ 2078 if (real_ttyfd >= 0) 2079 (void) close(real_ttyfd); 2080 2081 /* Don't pass handles to the PPP device, even by accident. */ 2082 new_fd = open (_PATH_DEVNULL, O_RDWR); 2083 if (new_fd >= 0) { 2084 if (new_fd != 0) { 2085 if (dup2(new_fd, 0) < 0) /* stdin <- /dev/null */ 2086 error("dup2(/dev/null, STDIN) failed: %m"); 2087 (void) close(new_fd); 2088 } 2089 if (dup2(0, 1) < 0) /* stdout -> /dev/null */ 2090 error("dup2(/dev/null, STDOUT) failed: %m"); 2091 if (dup2(0, 2) < 0) /* stderr -> /dev/null */ 2092 error("dup2(/dev/null, STDERR) failed: %m"); 2093 } 2094 2095 #ifdef BSD 2096 /* Force the priority back to zero if pppd is running higher. */ 2097 if (setpriority (PRIO_PROCESS, 0, 0) < 0) 2098 warn("can't reset priority to 0: %m"); 2099 #endif 2100 2101 /* SysV recommends a second fork at this point. */ 2102 2103 /* run the program */ 2104 (void) execve(prog, args, script_env); 2105 if (must_exist || errno != ENOENT) { 2106 /* have to reopen the log, there's nowhere else 2107 for the message to go. */ 2108 reopen_log(); 2109 syslog(LOG_ERR, "Can't execute %s: %m", prog); 2110 closelog(); 2111 } 2112 _exit(-1); 2113 } 2114 2115 if (debug) 2116 dbglog("Script %s started (pid %d)", prog, pid); 2117 record_child(pid, prog, done, arg); 2118 2119 return (pid); 2120 } 2121 2122 2123 /* 2124 * record_child - add a child process to the list for reap_kids 2125 * to use. 2126 */ 2127 static void 2128 record_child(pid, prog, done, arg) 2129 pid_t pid; 2130 char *prog; 2131 void (*done) __P((void *, int)); 2132 void *arg; 2133 { 2134 struct subprocess *chp; 2135 2136 ++n_children; 2137 2138 chp = (struct subprocess *) malloc(sizeof(struct subprocess)); 2139 if (chp == NULL) { 2140 warn("losing track of %s process", prog); 2141 } else { 2142 chp->pid = pid; 2143 chp->prog = prog; 2144 chp->done = done; 2145 chp->arg = arg; 2146 chp->next = children; 2147 children = chp; 2148 } 2149 } 2150 2151 2152 /* 2153 * reap_kids - get status from any dead child processes, 2154 * and log a message for abnormal terminations. 2155 */ 2156 static int 2157 reap_kids(waitfor) 2158 int waitfor; 2159 { 2160 pid_t pid; 2161 int status, i; 2162 struct subprocess *chp, **prevp; 2163 2164 got_sigchld = 0; 2165 if (n_children == 0) 2166 return (0); 2167 2168 /*CONSTANTCONDITION*/ 2169 while (1) { 2170 pid = waitpid(-1, &status, (waitfor ? 0 : WNOHANG)); 2171 if (pid == 0) { 2172 break; /* return 0 */ 2173 } else if (pid == -1) { 2174 if (errno == EINTR) 2175 continue; 2176 if (errno != ECHILD) 2177 error("Error waiting for child process: %m"); 2178 return (-1); 2179 } else { 2180 for (prevp = &children; (chp = *prevp) != NULL; 2181 prevp = &chp->next) { 2182 if (chp->pid == pid) { 2183 --n_children; 2184 *prevp = chp->next; 2185 break; 2186 } 2187 } 2188 if (WIFSIGNALED(status) || WIFSTOPPED(status)) { 2189 i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status); 2190 warn("Child process %s (pid %d) %s with signal %d (%s)", 2191 (chp != NULL ? chp->prog : "??"), pid, 2192 (WIFSIGNALED(status) ? "terminated" : "stopped"), 2193 i, signal_name(i)); 2194 } else if (debug) { 2195 dbglog("Child process %s finished (pid %d), status = %d", 2196 (chp != NULL ? chp->prog: "??"), pid, 2197 WEXITSTATUS(status)); 2198 } 2199 if ((chp != NULL) && (chp->done != NULL)) 2200 (*chp->done)(chp->arg, status); 2201 if (chp != NULL) 2202 free(chp); 2203 } 2204 } 2205 return (0); 2206 } 2207 2208 /* 2209 * infanticide - timeout while waiting for child process. 2210 */ 2211 /*ARGSUSED*/ 2212 static void 2213 infanticide(sig) 2214 int sig; 2215 { 2216 struct subprocess *chp; 2217 static int runcount = 0; 2218 2219 if (runcount < 2) { 2220 for (chp = children; chp != NULL; chp = chp->next) 2221 (void) kill(chp->pid, runcount == 0 ? SIGTERM : SIGKILL); 2222 } else { 2223 kill_my_pg(SIGTERM); 2224 /* Quit and hope for the best. */ 2225 n_children = 0; 2226 } 2227 runcount++; 2228 } 2229 2230 /* 2231 * Perform final wait before exiting. 2232 */ 2233 static void 2234 final_reap() 2235 { 2236 struct sigaction sa; 2237 struct subprocess *chp; 2238 2239 if (n_children > 0 && debug) { 2240 dbglog("Waiting for %d child processes...", n_children); 2241 for (chp = children; chp != NULL; chp = chp->next) 2242 dbglog(" pid %d: %s", chp->pid, chp->prog); 2243 } 2244 BZERO(&sa, sizeof (sa)); 2245 /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, infanticide); 2246 while (n_children > 0) { 2247 (void) alarm(7); 2248 if (reap_kids(1) < 0) 2249 break; 2250 } 2251 (void) alarm(0); 2252 } 2253 2254 /* 2255 * novm - log an error message saying we ran out of memory, and die. 2256 */ 2257 void 2258 novm(msg) 2259 char *msg; 2260 { 2261 fatal("Virtual memory exhausted allocating %s\n", msg); 2262 } 2263 2264 /* 2265 * script_setenv - set an environment variable value to be used 2266 * for scripts that we run (e.g. ip-up, auth-up, etc.) 2267 */ 2268 void 2269 script_setenv(var, value, iskey) 2270 const char *var; 2271 const char *value; 2272 int iskey; 2273 { 2274 size_t varl = strlen(var); 2275 size_t vl = varl + strlen(value) + 2; 2276 int i; 2277 char *p, *newstring; 2278 2279 /* 2280 * XXX: Can we assert that a tdb write lock is held here ? It appears that 2281 * Linux's use of tdb is not safe. 2282 */ 2283 newstring = (char *) malloc(vl+1); 2284 if (newstring == NULL) { 2285 novm("script environment string"); 2286 return; 2287 } 2288 *newstring++ = iskey; 2289 (void) slprintf(newstring, vl, "%s=%s", var, value); 2290 2291 /* check if this variable is already set */ 2292 if (script_env != NULL) { 2293 for (i = 0; (p = script_env[i]) != NULL; ++i) { 2294 if (strncmp(p, var, varl) == 0 && p[varl] == '=') { 2295 #ifdef HAVE_MULTILINK 2296 if (p[-1] != '\0' && pppdb != NULL) 2297 delete_db_key(p); 2298 #endif 2299 free(p-1); 2300 script_env[i] = newstring; 2301 #ifdef HAVE_MULTILINK 2302 if (iskey && pppdb != NULL) 2303 add_db_key(newstring); 2304 update_db_entry(); 2305 #endif 2306 return; 2307 } 2308 } 2309 } else { 2310 /* no space allocated for script env. ptrs. yet */ 2311 i = 0; 2312 script_env = (char **) malloc(16 * sizeof(char *)); 2313 if (script_env == NULL) { 2314 novm("script environment variable."); 2315 return; 2316 } 2317 s_env_nalloc = 16; 2318 } 2319 2320 /* reallocate script_env with more space if needed */ 2321 if (i + 1 >= s_env_nalloc) { 2322 int new_n = i + 17; 2323 char **newenv = (char **) realloc((void *)script_env, 2324 new_n * sizeof(char *)); 2325 if (newenv == NULL) { 2326 novm("expanded script environment variable."); 2327 return; 2328 } 2329 script_env = newenv; 2330 s_env_nalloc = new_n; 2331 } 2332 2333 script_env[i] = newstring; 2334 script_env[i+1] = NULL; 2335 2336 #ifdef HAVE_MULTILINK 2337 if (pppdb != NULL) { 2338 if (iskey) 2339 add_db_key(newstring); 2340 update_db_entry(); 2341 } 2342 #endif 2343 } 2344 2345 /* 2346 * script_unsetenv - remove a variable from the environment 2347 * for scripts. 2348 */ 2349 void 2350 script_unsetenv(var) 2351 const char *var; 2352 { 2353 int vl = strlen(var); 2354 int i; 2355 char *p; 2356 2357 /* 2358 * XXX: Can we assert that a tdb write lock is held here ? It appears that 2359 * Linux's use of tdb is not safe. 2360 */ 2361 if (script_env == NULL) 2362 return; 2363 for (i = 0; (p = script_env[i]) != NULL; ++i) { 2364 if (strncmp(p, var, vl) == 0 && p[vl] == '=') { 2365 #ifdef HAVE_MULTILINK 2366 if (p[-1] != '\0' && pppdb != NULL) 2367 delete_db_key(p); 2368 #endif 2369 free(p-1); 2370 while ((script_env[i] = script_env[i+1]) != NULL) 2371 ++i; 2372 break; 2373 } 2374 } 2375 #ifdef HAVE_MULTILINK 2376 if ((pppdb != NULL) && (p != NULL)) 2377 update_db_entry(); 2378 #endif 2379 } 2380 2381 /* 2382 * script_getenv - find a variable in the script environment. 2383 */ 2384 const char * 2385 script_getenv(var) 2386 const char *var; 2387 { 2388 int vl = strlen(var); 2389 int i; 2390 char *p; 2391 2392 if (script_env == NULL) 2393 return (NULL); 2394 for (i = 0; (p = script_env[i]) != NULL; ++i) { 2395 if (strncmp(p, var, vl) == 0 && p[vl] == '=') 2396 return ((const char *)p+vl+1); 2397 } 2398 return (NULL); 2399 } 2400 2401 #ifdef HAVE_MULTILINK 2402 /* 2403 * update_db_entry - update our entry in the database. 2404 */ 2405 static void 2406 update_db_entry() 2407 { 2408 TDB_DATA key, dbuf; 2409 int vlen, i; 2410 char *p, *q, *vbuf; 2411 2412 if (script_env == NULL) 2413 return; 2414 /* 2415 * vlen needs to be initialized as 1, or otherwise, the last string 2416 * is truncated by slprintf. 2417 */ 2418 vlen = 1; 2419 for (i = 0; (p = script_env[i]) != NULL; ++i) 2420 vlen += strlen(p) + 1; 2421 vbuf = malloc(vlen); 2422 if (vbuf == NULL) 2423 novm("database entry"); 2424 q = vbuf; 2425 for (i = 0; (p = script_env[i]) != NULL; ++i) 2426 q += slprintf(q, vbuf + vlen - q, "%s;", p); 2427 2428 key.dptr = db_key; 2429 key.dsize = strlen(db_key); 2430 dbuf.dptr = vbuf; 2431 dbuf.dsize = vlen; 2432 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2433 error("tdb_store failed: %s", tdb_error(pppdb)); 2434 } 2435 2436 /* 2437 * add_db_key - add a key that we can use to look up our database entry. 2438 */ 2439 static void 2440 add_db_key(str) 2441 const char *str; 2442 { 2443 TDB_DATA key, dbuf; 2444 2445 key.dptr = (char *) str; 2446 key.dsize = strlen(str); 2447 dbuf.dptr = db_key; 2448 dbuf.dsize = strlen(db_key); 2449 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2450 error("tdb_store key failed: %s", tdb_error(pppdb)); 2451 } 2452 2453 /* 2454 * delete_db_key - delete a key for looking up our database entry. 2455 */ 2456 static void 2457 delete_db_key(str) 2458 const char *str; 2459 { 2460 TDB_DATA key; 2461 2462 key.dptr = (char *) str; 2463 key.dsize = strlen(str); 2464 (void) tdb_delete(pppdb, key); 2465 } 2466 2467 /* 2468 * cleanup_db - delete all the entries we put in the database. 2469 */ 2470 static void 2471 cleanup_db() 2472 { 2473 TDB_DATA key; 2474 int i; 2475 char *p; 2476 2477 key.dptr = db_key; 2478 key.dsize = strlen(db_key); 2479 (void) tdb_delete(pppdb, key); 2480 for (i = 0; (p = script_env[i]) != NULL; ++i) 2481 if (p[-1] != '\0') 2482 delete_db_key(p); 2483 } 2484 #endif /* HAVE_MULTILINK */ 2485 2486 /* 2487 * open_socket - establish a stream socket connection to the nominated 2488 * host and port. 2489 * XXX: Need IPv6 support for those systems that support it (use getaddrinfo), 2490 * but requires portability changes. 2491 */ 2492 static int 2493 open_socket(dest) 2494 char *dest; 2495 { 2496 char *sep, *endp = NULL; 2497 int sock; 2498 int port = -1; 2499 u_int32_t host; 2500 struct hostent *hent = NULL; 2501 struct sockaddr_in sad; 2502 struct servent *se; 2503 2504 /* parse host:port and resolve host to an IP address */ 2505 sep = strchr(dest, ':'); 2506 if (sep != NULL) { 2507 se = getservbyname((const char *)sep+1, "tcp"); 2508 if (se != NULL) { 2509 port = ntohs(se->s_port); 2510 } else { 2511 port = strtol(sep+1, &endp, 10); 2512 if (endp == sep+1 || *endp != '\0') { 2513 error("Can't parse host:port for socket destination"); 2514 return (-1); 2515 } 2516 } 2517 } 2518 if (port < 0 || port > 65535 || sep == dest) { 2519 error("Can't parse host:port for socket destination"); 2520 return (-1); 2521 } 2522 *sep = '\0'; 2523 host = inet_addr(dest); 2524 if (host == (u_int32_t) -1) { 2525 hent = gethostbyname(dest); 2526 if (hent == NULL) { 2527 error("%s: unknown host in socket option", dest); 2528 *sep = ':'; 2529 return (-1); 2530 } 2531 BCOPY(hent->h_addr_list[0], &host, sizeof(host)); 2532 hent->h_addr_list++; 2533 } 2534 *sep = ':'; 2535 2536 for (;;) { 2537 /* get a socket and connect it to the other end */ 2538 sock = socket(PF_INET, SOCK_STREAM, 0); 2539 if (sock < 0) { 2540 error("Can't create socket: %m"); 2541 return (-1); 2542 } 2543 BZERO(&sad, sizeof(sad)); 2544 sad.sin_family = AF_INET; 2545 sad.sin_port = htons(port); 2546 sad.sin_addr.s_addr = host; 2547 if (connect(sock, (struct sockaddr *)&sad, sizeof(sad)) >= 0) { 2548 break; /* return sock file descriptor */ 2549 } 2550 if ((hent != NULL) && (hent->h_addr_list != NULL)) { 2551 BCOPY(hent->h_addr_list[0], &host, sizeof(host)); 2552 hent->h_addr_list++; 2553 (void) close(sock); 2554 continue; 2555 } 2556 error("Can't connect to %s: %m", dest); 2557 (void) close(sock); 2558 return (-1); 2559 } 2560 return (sock); 2561 } 2562 2563 /* 2564 * print_ncpstate - prints out current NCP state. 2565 * 2566 * We're normally called from SIGUSR1 here, but this is safe because 2567 * these signals are blocked unless we're idle waiting for events. 2568 * There's no need to otherwise lock the data structures referenced. 2569 */ 2570 void 2571 print_ncpstate(unit, strptr) 2572 int unit; 2573 FILE *strptr; 2574 { 2575 struct protent *protp; 2576 int i; 2577 2578 (void) flprintf(strptr, "In %s phase\n", phase_name(phase)); 2579 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 2580 if (protp->print_stat != NULL) 2581 (*protp->print_stat)(unit, strptr); 2582 } 2583 sys_print_state(strptr); 2584 } 2585 2586 /* 2587 * start_charshunt - create a child process to run the character shunt. 2588 */ 2589 static int 2590 start_charshunt(ifd, ofd) 2591 int ifd, ofd; 2592 { 2593 pid_t cpid; 2594 2595 cpid = fork(); 2596 if (cpid == (pid_t)-1) { 2597 error("Can't fork process for character shunt: %m"); 2598 return (0); 2599 } 2600 if (cpid == (pid_t)0) { 2601 /* child */ 2602 (void) close(pty_slave); 2603 pty_slave = -1; 2604 (void) setgid(getgid()); 2605 (void) setuid(uid); 2606 if (getuid() != uid) 2607 fatal("setuid failed"); 2608 if (!nodetach) 2609 log_to_fd = -1; 2610 charshunt(ifd, ofd, record_file); 2611 exit(0); 2612 } 2613 charshunt_pid = cpid; 2614 (void) close(pty_master); 2615 pty_master = -1; 2616 ttyfd = pty_slave; 2617 record_child(cpid, "pppd (charshunt)", charshunt_done, NULL); 2618 return (1); 2619 } 2620 2621 /*ARGSUSED*/ 2622 static void 2623 charshunt_done(arg, status) 2624 void *arg; 2625 int status; 2626 { 2627 charshunt_pid = (pid_t)0; 2628 } 2629 2630 static void 2631 reportme(int signo) 2632 { 2633 dbglog("charshunt taking signal %d", signo); 2634 exit(1); 2635 } 2636 2637 /* 2638 * charshunt - the character shunt, which passes characters between 2639 * the pty master side and the serial port (or stdin/stdout). 2640 * This runs as the user (not as root). 2641 * (We assume ofd >= ifd which is true the way this gets called. :-). 2642 */ 2643 static void 2644 charshunt(ifd, ofd, record_file) 2645 int ifd, ofd; 2646 char *record_file; 2647 { 2648 int n, nfds; 2649 fd_set ready, writey; 2650 u_char *ibufp, *obufp; 2651 int nibuf, nobuf; 2652 int flags; 2653 struct timeval lasttime; 2654 FILE *recordf = NULL; 2655 int ilevel, olevel, max_level; 2656 struct timeval levelt, tout, *top; 2657 2658 /* 2659 * Reset signal handlers. 2660 */ 2661 (void) signal(SIGHUP, SIG_IGN); /* Hangup */ 2662 (void) signal(SIGINT, reportme); /* Interrupt */ 2663 (void) signal(SIGTERM, reportme); /* Terminate */ 2664 (void) signal(SIGCHLD, reportme); 2665 (void) signal(SIGUSR1, reportme); 2666 (void) signal(SIGUSR2, reportme); 2667 (void) signal(SIGABRT, reportme); 2668 (void) signal(SIGALRM, reportme); 2669 (void) signal(SIGFPE, reportme); 2670 (void) signal(SIGILL, reportme); 2671 (void) signal(SIGPIPE, reportme); 2672 (void) signal(SIGQUIT, reportme); 2673 #ifndef DEBUG 2674 (void) signal(SIGSEGV, reportme); 2675 #endif 2676 #ifdef SIGBUS 2677 (void) signal(SIGBUS, reportme); 2678 #endif 2679 #ifdef SIGEMT 2680 (void) signal(SIGEMT, reportme); 2681 #endif 2682 #ifdef SIGPOLL 2683 (void) signal(SIGPOLL, reportme); 2684 #endif 2685 #ifdef SIGPROF 2686 (void) signal(SIGPROF, reportme); 2687 #endif 2688 #ifdef SIGSYS 2689 (void) signal(SIGSYS, reportme); 2690 #endif 2691 #ifdef SIGTRAP 2692 (void) signal(SIGTRAP, reportme); 2693 #endif 2694 #ifdef SIGVTALRM 2695 (void) signal(SIGVTALRM, reportme); 2696 #endif 2697 #ifdef SIGXCPU 2698 (void) signal(SIGXCPU, reportme); 2699 #endif 2700 #ifdef SIGXFSZ 2701 (void) signal(SIGXFSZ, reportme); 2702 #endif 2703 2704 /* 2705 * Open the record file if required. 2706 */ 2707 if (record_file != NULL) { 2708 recordf = fopen(record_file, "a"); 2709 if (recordf == NULL) 2710 error("Couldn't create record file %s: %m", record_file); 2711 } 2712 2713 /* set all the fds to non-blocking mode */ 2714 flags = fcntl(pty_master, F_GETFL); 2715 if (flags == -1 2716 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1) 2717 warn("couldn't set pty master to nonblock: %m"); 2718 flags = fcntl(ifd, F_GETFL); 2719 if (flags == -1 2720 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1) 2721 warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty")); 2722 if (ofd != ifd) { 2723 flags = fcntl(ofd, F_GETFL); 2724 if (flags == -1 2725 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1) 2726 warn("couldn't set stdout to nonblock: %m"); 2727 } 2728 2729 nibuf = nobuf = 0; 2730 ibufp = obufp = NULL; 2731 2732 ilevel = olevel = 0; 2733 (void) gettimeofday(&levelt, NULL); 2734 if (max_data_rate) { 2735 max_level = max_data_rate / 10; 2736 if (max_level < MAXLEVELMINSIZE) 2737 max_level = MAXLEVELMINSIZE; 2738 } else 2739 max_level = sizeof(inpacket_buf) + 1; 2740 2741 nfds = (ofd > pty_master? ofd: pty_master) + 1; 2742 if (recordf != NULL) { 2743 (void) gettimeofday(&lasttime, NULL); 2744 (void) putc(RECMARK_TIMESTART, recordf); /* put start marker */ 2745 (void) putc(lasttime.tv_sec >> 24, recordf); 2746 (void) putc(lasttime.tv_sec >> 16, recordf); 2747 (void) putc(lasttime.tv_sec >> 8, recordf); 2748 (void) putc(lasttime.tv_sec, recordf); 2749 lasttime.tv_usec = 0; 2750 } 2751 2752 while (nibuf != 0 || nobuf != 0 || ofd >= 0 || pty_master >= 0) { 2753 top = 0; 2754 tout.tv_sec = 0; 2755 tout.tv_usec = 10000; 2756 FD_ZERO(&ready); 2757 FD_ZERO(&writey); 2758 if (nibuf != 0) { 2759 if (ilevel >= max_level) 2760 top = &tout; 2761 else if (pty_master >= 0) 2762 FD_SET(pty_master, &writey); 2763 } else if (ifd >= 0) 2764 FD_SET(ifd, &ready); 2765 if (nobuf != 0) { 2766 if (olevel >= max_level) 2767 top = &tout; 2768 else if (ofd >= 0) 2769 FD_SET(ofd, &writey); 2770 } else { 2771 /* Don't read from pty if it's gone or it has closed. */ 2772 if (pty_master >= 0 && ofd >= 0) 2773 FD_SET(pty_master, &ready); 2774 } 2775 if (select(nfds, &ready, &writey, NULL, top) < 0) { 2776 if (errno != EINTR) 2777 fatal("select"); 2778 continue; 2779 } 2780 if (max_data_rate) { 2781 double dt; 2782 int nbt; 2783 struct timeval now; 2784 2785 (void) gettimeofday(&now, NULL); 2786 dt = (now.tv_sec - levelt.tv_sec 2787 + (now.tv_usec - levelt.tv_usec) / 1e6); 2788 nbt = (int)(dt * max_data_rate); 2789 ilevel = (nbt < 0 || nbt > ilevel)? 0: ilevel - nbt; 2790 olevel = (nbt < 0 || nbt > olevel)? 0: olevel - nbt; 2791 levelt = now; 2792 } else 2793 ilevel = olevel = 0; 2794 if (FD_ISSET(ifd, &ready)) { 2795 ibufp = inpacket_buf; 2796 nibuf = read(ifd, ibufp, sizeof(inpacket_buf)); 2797 if (nibuf < 0 && errno == EIO) 2798 nibuf = 0; 2799 if (nibuf < 0 || pty_master == -1) { 2800 if (errno != EINTR && errno != EAGAIN) { 2801 error("Error reading standard input: %m"); 2802 break; 2803 } 2804 nibuf = 0; 2805 } else if (nibuf == 0) { 2806 /* end of file from stdin */ 2807 (void) close(pty_master); 2808 pty_master = -1; 2809 (void) close(ifd); 2810 ifd = -1; 2811 if (recordf) 2812 if (!record_write(recordf, RECMARK_ENDRECV, NULL, 0, 2813 &lasttime)) 2814 recordf = NULL; 2815 } else { 2816 FD_SET(pty_master, &writey); 2817 if (recordf) 2818 if (!record_write(recordf, RECMARK_STARTRECV, ibufp, nibuf, 2819 &lasttime)) 2820 recordf = NULL; 2821 } 2822 } 2823 if (ofd >= 0 && pty_master >= 0 && FD_ISSET(pty_master, &ready)) { 2824 obufp = outpacket_buf; 2825 nobuf = read(pty_master, obufp, sizeof(outpacket_buf)); 2826 if (nobuf < 0 && errno == EIO) 2827 nobuf = 0; 2828 if (nobuf < 0 || ofd == -1) { 2829 if (!(errno == EINTR || errno == EAGAIN)) { 2830 error("Error reading pseudo-tty master: %m"); 2831 break; 2832 } 2833 nobuf = 0; 2834 } else if (nobuf == 0) { 2835 /* end of file from the pty - slave side has closed */ 2836 nibuf = 0; 2837 (void) close(ofd); 2838 ofd = -1; 2839 if (recordf) 2840 if (!record_write(recordf, RECMARK_ENDSEND, NULL, 0, 2841 &lasttime)) 2842 recordf = NULL; 2843 } else { 2844 FD_SET(ofd, &writey); 2845 if (recordf) 2846 if (!record_write(recordf, RECMARK_STARTSEND, obufp, nobuf, 2847 &lasttime)) 2848 recordf = NULL; 2849 } 2850 } 2851 if (ofd == -1) 2852 nobuf = 0; 2853 else if (FD_ISSET(ofd, &writey)) { 2854 n = nobuf; 2855 if (olevel + n > max_level) 2856 n = max_level - olevel; 2857 n = write(ofd, obufp, n); 2858 if (n < 0) { 2859 if (errno == EIO) { 2860 (void) close(ofd); 2861 ofd = -1; 2862 nobuf = 0; 2863 } else if (errno != EAGAIN && errno != EINTR) { 2864 error("Error writing standard output: %m"); 2865 break; 2866 } 2867 } else { 2868 obufp += n; 2869 nobuf -= n; 2870 olevel += n; 2871 } 2872 } 2873 if (pty_master == -1) 2874 nibuf = 0; 2875 else if (FD_ISSET(pty_master, &writey)) { 2876 n = nibuf; 2877 if (ilevel + n > max_level) 2878 n = max_level - ilevel; 2879 n = write(pty_master, ibufp, n); 2880 if (n < 0) { 2881 if (errno == EAGAIN || errno == EINTR) 2882 continue; 2883 if (errno != EIO) { 2884 error("Error writing pseudo-tty master: %m"); 2885 break; 2886 } 2887 (void) close(pty_master); 2888 pty_master = -1; 2889 nibuf = 0; 2890 } else { 2891 ibufp += n; 2892 nibuf -= n; 2893 ilevel += n; 2894 } 2895 } 2896 } 2897 exit(0); 2898 } 2899 2900 static int 2901 record_write(f, code, buf, nb, tp) 2902 FILE *f; 2903 int code; 2904 u_char *buf; 2905 int nb; 2906 struct timeval *tp; 2907 { 2908 struct timeval now; 2909 int diff; 2910 2911 (void) gettimeofday(&now, NULL); 2912 now.tv_usec /= 100000; /* actually 1/10 s, not usec now */ 2913 diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec); 2914 if (diff > 0) { 2915 if (diff > 255) { 2916 (void) putc(RECMARK_TIMEDELTA32, f); 2917 (void) putc(diff >> 24, f); 2918 (void) putc(diff >> 16, f); 2919 (void) putc(diff >> 8, f); 2920 (void) putc(diff, f); 2921 } else { 2922 (void) putc(RECMARK_TIMEDELTA8, f); 2923 (void) putc(diff, f); 2924 } 2925 *tp = now; 2926 } 2927 (void) putc(code, f); 2928 if (buf != NULL) { 2929 (void) putc(nb >> 8, f); 2930 (void) putc(nb, f); 2931 (void) fwrite(buf, nb, 1, f); 2932 } 2933 (void) fflush(f); 2934 if (ferror(f)) { 2935 error("Error writing record file: %m"); 2936 return (0); 2937 } 2938 return (1); 2939 } 2940