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 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 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 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 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 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 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 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 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 * 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 * 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 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 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 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 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 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 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 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 * 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 * 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 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 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 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 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 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 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 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 2617 charshunt_done(arg, status) 2618 void *arg; 2619 int status; 2620 { 2621 charshunt_pid = (pid_t)0; 2622 } 2623 2624 static void 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 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 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