1 /* 2 * main.c - Point-to-Point Protocol main module 3 * 4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * 3. The name "Carnegie Mellon University" must not be used to 19 * endorse or promote products derived from this software without 20 * prior written permission. For permission or any legal 21 * details, please contact 22 * Office of Technology Transfer 23 * Carnegie Mellon University 24 * 5000 Forbes Avenue 25 * Pittsburgh, PA 15213-3890 26 * (412) 268-4387, fax: (412) 268-7395 27 * tech-transfer (at) andrew.cmu.edu 28 * 29 * 4. Redistributions of any form whatsoever must retain the following 30 * acknowledgment: 31 * "This product includes software developed by Computing Services 32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 33 * 34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 35 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 38 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 41 * 42 * Copyright (c) 1999-2004 Paul Mackerras. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 51 * 2. The name(s) of the authors of this software must not be used to 52 * endorse or promote products derived from this software without 53 * prior written permission. 54 * 55 * 3. Redistributions of any form whatsoever must retain the following 56 * acknowledgment: 57 * "This product includes software developed by Paul Mackerras 58 * <paulus (at) samba.org>". 59 * 60 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 61 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 62 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 63 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 65 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 66 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 67 */ 68 69 #define RCSID "$Id: main.c,v 1.156 2008/06/23 11:47:18 paulus Exp $" 70 71 #include <stdio.h> 72 #include <ctype.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <unistd.h> 76 #include <signal.h> 77 #include <errno.h> 78 #include <fcntl.h> 79 #include <syslog.h> 80 #include <netdb.h> 81 #include <utmp.h> 82 #include <pwd.h> 83 #include <setjmp.h> 84 #include <sys/param.h> 85 #include <sys/types.h> 86 #include <sys/wait.h> 87 #include <sys/time.h> 88 #include <sys/resource.h> 89 #include <sys/stat.h> 90 #include <sys/socket.h> 91 #include <netinet/in.h> 92 #include <arpa/inet.h> 93 94 #include "pppd.h" 95 #include "magic.h" 96 #include "fsm.h" 97 #include "lcp.h" 98 #include "ipcp.h" 99 #ifdef INET6 100 #include "ipv6cp.h" 101 #endif 102 #include "upap.h" 103 #include "chap-new.h" 104 #include "eap.h" 105 #include "ccp.h" 106 #include "ecp.h" 107 #include "pathnames.h" 108 109 #ifdef USE_TDB 110 #include "tdb.h" 111 #endif 112 113 #ifdef CBCP_SUPPORT 114 #include "cbcp.h" 115 #endif 116 117 #ifdef IPX_CHANGE 118 #include "ipxcp.h" 119 #endif /* IPX_CHANGE */ 120 #ifdef AT_CHANGE 121 #include "atcp.h" 122 #endif 123 124 static const char rcsid[] = RCSID; 125 126 /* interface vars */ 127 char ifname[32]; /* Interface name */ 128 int ifunit; /* Interface unit number */ 129 130 struct channel *the_channel; 131 132 char *progname; /* Name of this program */ 133 char hostname[MAXNAMELEN]; /* Our hostname */ 134 static char pidfilename[MAXPATHLEN]; /* name of pid file */ 135 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ 136 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ 137 uid_t uid; /* Our real user-id */ 138 struct notifier *pidchange = NULL; 139 struct notifier *phasechange = NULL; 140 struct notifier *exitnotify = NULL; 141 struct notifier *sigreceived = NULL; 142 struct notifier *fork_notifier = NULL; 143 144 int hungup; /* terminal has been hung up */ 145 int privileged; /* we're running as real uid root */ 146 int need_holdoff; /* need holdoff period before restarting */ 147 int detached; /* have detached from terminal */ 148 volatile int status; /* exit status for pppd */ 149 int unsuccess; /* # unsuccessful connection attempts */ 150 int do_callback; /* != 0 if we should do callback next */ 151 int doing_callback; /* != 0 if we are doing callback */ 152 int ppp_session_number; /* Session number, for channels with such a 153 concept (eg PPPoE) */ 154 int childwait_done; /* have timed out waiting for children */ 155 156 #ifdef USE_TDB 157 TDB_CONTEXT *pppdb; /* database for storing status etc. */ 158 #endif 159 160 char db_key[32]; 161 162 int (*holdoff_hook) __P((void)) = NULL; 163 int (*new_phase_hook) __P((int)) = NULL; 164 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL; 165 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL; 166 167 static int conn_running; /* we have a [dis]connector running */ 168 static int fd_loop; /* fd for getting demand-dial packets */ 169 170 int fd_devnull; /* fd for /dev/null */ 171 int devfd = -1; /* fd of underlying device */ 172 int fd_ppp = -1; /* fd for talking PPP */ 173 int phase; /* where the link is at */ 174 int kill_link; 175 int asked_to_quit; 176 int open_ccp_flag; 177 int listen_time; 178 int got_sigusr2; 179 int got_sigterm; 180 int got_sighup; 181 182 static sigset_t signals_handled; 183 static int waiting; 184 static sigjmp_buf sigjmp; 185 186 char **script_env; /* Env. variable values for scripts */ 187 int s_env_nalloc; /* # words avail at script_env */ 188 189 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ 190 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ 191 192 static int n_children; /* # child processes still running */ 193 static int got_sigchld; /* set if we have received a SIGCHLD */ 194 195 int privopen; /* don't lock, open device as root */ 196 197 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; 198 199 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ 200 int ngroups; /* How many groups valid in groups */ 201 202 static struct timeval start_time; /* Time when link was started. */ 203 204 static struct pppd_stats old_link_stats; 205 struct pppd_stats link_stats; 206 unsigned link_connect_time; 207 int link_stats_valid; 208 209 int error_count; 210 211 bool bundle_eof; 212 bool bundle_terminating; 213 214 /* 215 * We maintain a list of child process pids and 216 * functions to call when they exit. 217 */ 218 struct subprocess { 219 pid_t pid; 220 char *prog; 221 void (*done) __P((void *)); 222 void *arg; 223 int killable; 224 struct subprocess *next; 225 }; 226 227 static struct subprocess *children; 228 229 /* Prototypes for procedures local to this file. */ 230 231 static void setup_signals __P((void)); 232 static void create_pidfile __P((int pid)); 233 static void create_linkpidfile __P((int pid)); 234 static void cleanup __P((void)); 235 static void get_input __P((void)); 236 static void calltimeout __P((void)); 237 static struct timeval *timeleft __P((struct timeval *)); 238 static void kill_my_pg __P((int)); 239 static void hup __P((int)); 240 static void term __P((int)); 241 static void chld __P((int)); 242 static void toggle_debug __P((int)); 243 static void open_ccp __P((int)); 244 static void bad_signal __P((int)); 245 static void holdoff_end __P((void *)); 246 static void forget_child __P((int pid, int status)); 247 static int reap_kids __P((void)); 248 static void childwait_end __P((void *)); 249 250 #ifdef USE_TDB 251 static void update_db_entry __P((void)); 252 static void add_db_key __P((const char *)); 253 static void delete_db_key __P((const char *)); 254 static void cleanup_db __P((void)); 255 #endif 256 257 static void handle_events __P((void)); 258 void print_link_stats __P((void)); 259 260 extern char *ttyname __P((int)); 261 extern char *getlogin __P((void)); 262 int main __P((int, char *[])); 263 264 #ifdef ultrix 265 #undef O_NONBLOCK 266 #define O_NONBLOCK O_NDELAY 267 #endif 268 269 #ifdef ULTRIX 270 #define setlogmask(x) 271 #endif 272 273 /* 274 * PPP Data Link Layer "protocol" table. 275 * One entry per supported protocol. 276 * The last entry must be NULL. 277 */ 278 struct protent *protocols[] = { 279 &lcp_protent, 280 &pap_protent, 281 &chap_protent, 282 #ifdef CBCP_SUPPORT 283 &cbcp_protent, 284 #endif 285 &ipcp_protent, 286 #ifdef INET6 287 &ipv6cp_protent, 288 #endif 289 &ccp_protent, 290 &ecp_protent, 291 #ifdef IPX_CHANGE 292 &ipxcp_protent, 293 #endif 294 #ifdef AT_CHANGE 295 &atcp_protent, 296 #endif 297 &eap_protent, 298 NULL 299 }; 300 301 /* 302 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. 303 */ 304 #if !defined(PPP_DRV_NAME) 305 #define PPP_DRV_NAME "ppp" 306 #endif /* !defined(PPP_DRV_NAME) */ 307 308 int 309 main(argc, argv) 310 int argc; 311 char *argv[]; 312 { 313 int i, t; 314 char *p; 315 struct passwd *pw; 316 struct protent *protp; 317 char numbuf[16]; 318 319 link_stats_valid = 0; 320 new_phase(PHASE_INITIALIZE); 321 322 script_env = NULL; 323 324 /* Initialize syslog facilities */ 325 reopen_log(); 326 327 if (gethostname(hostname, MAXNAMELEN) < 0 ) { 328 option_error("Couldn't get hostname: %m"); 329 exit(1); 330 } 331 hostname[MAXNAMELEN-1] = 0; 332 333 /* make sure we don't create world or group writable files. */ 334 umask(umask(0777) | 022); 335 336 uid = getuid(); 337 privileged = uid == 0; 338 slprintf(numbuf, sizeof(numbuf), "%d", uid); 339 script_setenv("ORIG_UID", numbuf, 0); 340 341 ngroups = getgroups(NGROUPS_MAX, groups); 342 343 /* 344 * Initialize magic number generator now so that protocols may 345 * use magic numbers in initialization. 346 */ 347 magic_init(); 348 349 /* 350 * Initialize each protocol. 351 */ 352 for (i = 0; (protp = protocols[i]) != NULL; ++i) 353 (*protp->init)(0); 354 355 /* 356 * Initialize the default channel. 357 */ 358 tty_init(); 359 360 progname = *argv; 361 362 #if defined(__ANDROID__) 363 { 364 extern void pppox_init(); 365 pppox_init(); 366 privileged = 1; 367 } 368 { 369 char *envargs = getenv("envargs"); 370 if (envargs) { 371 int i; 372 /* Decode the arguments in-place and count the number of them. 373 * They were hex encoded using [A-P] instead of [0-9A-F]. */ 374 for (argc = 0, i = 0; envargs[i] && envargs[i + 1]; i += 2) { 375 char c = ((envargs[i] - 'A') << 4) + (envargs[i + 1] - 'A'); 376 if (c == 0) { 377 ++argc; 378 } 379 envargs[i / 2 + 1] = c; 380 } 381 if (argc == 0 || (argv = malloc(sizeof(char *) * argc)) == NULL) { 382 fatal("Failed to parse envargs!"); 383 } 384 for (envargs[0] = 0, i = 0; i < argc; ++envargs) { 385 if (envargs[0] == 0) { 386 argv[i++] = &envargs[1]; 387 } 388 } 389 } 390 } 391 #endif 392 393 /* 394 * Parse, in order, the system options file, the user's options file, 395 * and the command line arguments. 396 */ 397 #if defined(__ANDROID__) 398 /* Android: only take options from commandline */ 399 if (!parse_args(argc-1, argv+1)) 400 exit(EXIT_OPTION_ERROR); 401 402 #else 403 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) 404 || !options_from_user() 405 || !parse_args(argc-1, argv+1)) 406 exit(EXIT_OPTION_ERROR); 407 408 #endif 409 410 devnam_fixed = 1; /* can no longer change device name */ 411 412 /* 413 * Work out the device name, if it hasn't already been specified, 414 * and parse the tty's options file. 415 */ 416 if (the_channel->process_extra_options) 417 (*the_channel->process_extra_options)(); 418 419 if (debug) 420 setlogmask(LOG_UPTO(LOG_DEBUG)); 421 422 #if !defined(__ANDROID__) 423 /* 424 * Check that we are running as root. 425 */ 426 if (geteuid() != 0) { 427 option_error("must be root to run %s, since it is not setuid-root", 428 argv[0]); 429 exit(EXIT_NOT_ROOT); 430 } 431 #endif 432 433 if (!ppp_available()) { 434 option_error("%s", no_ppp_msg); 435 exit(EXIT_NO_KERNEL_SUPPORT); 436 } 437 438 /* 439 * Check that the options given are valid and consistent. 440 */ 441 check_options(); 442 if (!sys_check_options()) 443 exit(EXIT_OPTION_ERROR); 444 auth_check_options(); 445 #ifdef HAVE_MULTILINK 446 mp_check_options(); 447 #endif 448 for (i = 0; (protp = protocols[i]) != NULL; ++i) 449 if (protp->check_options != NULL) 450 (*protp->check_options)(); 451 if (the_channel->check_options) 452 (*the_channel->check_options)(); 453 454 455 if (dump_options || dryrun) { 456 init_pr_log(NULL, LOG_INFO); 457 print_options(pr_log, NULL); 458 end_pr_log(); 459 } 460 461 if (dryrun) 462 die(0); 463 464 /* Make sure fds 0, 1, 2 are open to somewhere. */ 465 fd_devnull = open(_PATH_DEVNULL, O_RDWR); 466 if (fd_devnull < 0) 467 fatal("Couldn't open %s: %m", _PATH_DEVNULL); 468 while (fd_devnull <= 2) { 469 i = dup(fd_devnull); 470 if (i < 0) 471 fatal("Critical shortage of file descriptors: dup failed: %m"); 472 fd_devnull = i; 473 } 474 475 /* 476 * Initialize system-dependent stuff. 477 */ 478 sys_init(); 479 #ifdef USE_TDB 480 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); 481 if (pppdb != NULL) { 482 slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); 483 update_db_entry(); 484 } else { 485 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); 486 if (multilink) { 487 warn("Warning: disabling multilink"); 488 multilink = 0; 489 } 490 } 491 #endif 492 493 /* 494 * Detach ourselves from the terminal, if required, 495 * and identify who is running us. 496 */ 497 if (!nodetach && !updetach) 498 detach(); 499 p = getlogin(); 500 if (p == NULL) { 501 pw = getpwuid(uid); 502 if (pw != NULL && pw->pw_name != NULL) 503 p = pw->pw_name; 504 else 505 p = "(unknown)"; 506 } 507 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid); 508 script_setenv("PPPLOGNAME", p, 0); 509 510 if (devnam[0]) 511 script_setenv("DEVICE", devnam, 1); 512 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 513 script_setenv("PPPD_PID", numbuf, 1); 514 515 setup_signals(); 516 517 create_linkpidfile(getpid()); 518 519 waiting = 0; 520 521 /* 522 * If we're doing dial-on-demand, set up the interface now. 523 */ 524 if (demand) { 525 /* 526 * Open the loopback channel and set it up to be the ppp interface. 527 */ 528 fd_loop = open_ppp_loopback(); 529 set_ifunit(1); 530 /* 531 * Configure the interface and mark it up, etc. 532 */ 533 demand_conf(); 534 } 535 536 do_callback = 0; 537 for (;;) { 538 539 bundle_eof = 0; 540 bundle_terminating = 0; 541 listen_time = 0; 542 need_holdoff = 1; 543 devfd = -1; 544 status = EXIT_OK; 545 ++unsuccess; 546 doing_callback = do_callback; 547 do_callback = 0; 548 549 if (demand && !doing_callback) { 550 /* 551 * Don't do anything until we see some activity. 552 */ 553 new_phase(PHASE_DORMANT); 554 demand_unblock(); 555 add_fd(fd_loop); 556 for (;;) { 557 handle_events(); 558 if (asked_to_quit) 559 break; 560 if (get_loop_output()) 561 break; 562 } 563 remove_fd(fd_loop); 564 if (asked_to_quit) 565 break; 566 567 /* 568 * Now we want to bring up the link. 569 */ 570 demand_block(); 571 info("Starting link"); 572 } 573 574 gettimeofday(&start_time, NULL); 575 script_unsetenv("CONNECT_TIME"); 576 script_unsetenv("BYTES_SENT"); 577 script_unsetenv("BYTES_RCVD"); 578 579 lcp_open(0); /* Start protocol */ 580 start_link(0); 581 while (phase != PHASE_DEAD) { 582 handle_events(); 583 get_input(); 584 if (kill_link) 585 lcp_close(0, "User request"); 586 if (asked_to_quit) { 587 bundle_terminating = 1; 588 if (phase == PHASE_MASTER) 589 mp_bundle_terminated(); 590 } 591 if (open_ccp_flag) { 592 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { 593 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ 594 (*ccp_protent.open)(0); 595 } 596 } 597 } 598 /* restore FSMs to original state */ 599 lcp_close(0, ""); 600 601 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail)) 602 break; 603 604 if (demand) 605 demand_discard(); 606 t = need_holdoff? holdoff: 0; 607 if (holdoff_hook) 608 t = (*holdoff_hook)(); 609 if (t > 0) { 610 new_phase(PHASE_HOLDOFF); 611 TIMEOUT(holdoff_end, NULL, t); 612 do { 613 handle_events(); 614 if (kill_link) 615 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ 616 } while (phase == PHASE_HOLDOFF); 617 if (!persist) 618 break; 619 } 620 } 621 622 /* Wait for scripts to finish */ 623 reap_kids(); 624 if (n_children > 0) { 625 if (child_wait > 0) 626 TIMEOUT(childwait_end, NULL, child_wait); 627 if (debug) { 628 struct subprocess *chp; 629 dbglog("Waiting for %d child processes...", n_children); 630 for (chp = children; chp != NULL; chp = chp->next) 631 dbglog(" script %s, pid %d", chp->prog, chp->pid); 632 } 633 while (n_children > 0 && !childwait_done) { 634 handle_events(); 635 if (kill_link && !childwait_done) 636 childwait_end(NULL); 637 } 638 } 639 640 die(status); 641 return 0; 642 } 643 644 /* 645 * handle_events - wait for something to happen and respond to it. 646 */ 647 static void 648 handle_events() 649 { 650 struct timeval timo; 651 652 kill_link = open_ccp_flag = 0; 653 if (sigsetjmp(sigjmp, 1) == 0) { 654 sigprocmask(SIG_BLOCK, &signals_handled, NULL); 655 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { 656 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 657 } else { 658 waiting = 1; 659 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 660 wait_input(timeleft(&timo)); 661 } 662 } 663 waiting = 0; 664 calltimeout(); 665 if (got_sighup) { 666 info("Hangup (SIGHUP)"); 667 kill_link = 1; 668 got_sighup = 0; 669 if (status != EXIT_HANGUP) 670 status = EXIT_USER_REQUEST; 671 } 672 if (got_sigterm) { 673 info("Terminating on signal %d", got_sigterm); 674 kill_link = 1; 675 asked_to_quit = 1; 676 persist = 0; 677 status = EXIT_USER_REQUEST; 678 got_sigterm = 0; 679 } 680 if (got_sigchld) { 681 got_sigchld = 0; 682 reap_kids(); /* Don't leave dead kids lying around */ 683 } 684 if (got_sigusr2) { 685 open_ccp_flag = 1; 686 got_sigusr2 = 0; 687 } 688 } 689 690 /* 691 * setup_signals - initialize signal handling. 692 */ 693 static void 694 setup_signals() 695 { 696 struct sigaction sa; 697 698 /* 699 * Compute mask of all interesting signals and install signal handlers 700 * for each. Only one signal handler may be active at a time. Therefore, 701 * all other signals should be masked when any handler is executing. 702 */ 703 sigemptyset(&signals_handled); 704 sigaddset(&signals_handled, SIGHUP); 705 sigaddset(&signals_handled, SIGINT); 706 sigaddset(&signals_handled, SIGTERM); 707 sigaddset(&signals_handled, SIGCHLD); 708 sigaddset(&signals_handled, SIGUSR2); 709 710 #define SIGNAL(s, handler) do { \ 711 sa.sa_handler = handler; \ 712 if (sigaction(s, &sa, NULL) < 0) \ 713 fatal("Couldn't establish signal handler (%d): %m", s); \ 714 } while (0) 715 716 sa.sa_mask = signals_handled; 717 sa.sa_flags = 0; 718 SIGNAL(SIGHUP, hup); /* Hangup */ 719 SIGNAL(SIGINT, term); /* Interrupt */ 720 SIGNAL(SIGTERM, term); /* Terminate */ 721 SIGNAL(SIGCHLD, chld); 722 723 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ 724 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ 725 726 /* 727 * Install a handler for other signals which would otherwise 728 * cause pppd to exit without cleaning up. 729 */ 730 SIGNAL(SIGABRT, bad_signal); 731 SIGNAL(SIGALRM, bad_signal); 732 SIGNAL(SIGFPE, bad_signal); 733 SIGNAL(SIGILL, bad_signal); 734 SIGNAL(SIGPIPE, bad_signal); 735 SIGNAL(SIGQUIT, bad_signal); 736 SIGNAL(SIGSEGV, bad_signal); 737 #ifdef SIGBUS 738 SIGNAL(SIGBUS, bad_signal); 739 #endif 740 #ifdef SIGEMT 741 SIGNAL(SIGEMT, bad_signal); 742 #endif 743 #ifdef SIGPOLL 744 SIGNAL(SIGPOLL, bad_signal); 745 #endif 746 #ifdef SIGPROF 747 SIGNAL(SIGPROF, bad_signal); 748 #endif 749 #ifdef SIGSYS 750 SIGNAL(SIGSYS, bad_signal); 751 #endif 752 #ifdef SIGTRAP 753 SIGNAL(SIGTRAP, bad_signal); 754 #endif 755 #ifdef SIGVTALRM 756 SIGNAL(SIGVTALRM, bad_signal); 757 #endif 758 #ifdef SIGXCPU 759 SIGNAL(SIGXCPU, bad_signal); 760 #endif 761 #ifdef SIGXFSZ 762 SIGNAL(SIGXFSZ, bad_signal); 763 #endif 764 765 /* 766 * Apparently we can get a SIGPIPE when we call syslog, if 767 * syslogd has died and been restarted. Ignoring it seems 768 * be sufficient. 769 */ 770 signal(SIGPIPE, SIG_IGN); 771 } 772 773 /* 774 * set_ifunit - do things we need to do once we know which ppp 775 * unit we are using. 776 */ 777 void 778 set_ifunit(iskey) 779 int iskey; 780 { 781 info("Using interface %s%d", PPP_DRV_NAME, ifunit); 782 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit); 783 script_setenv("IFNAME", ifname, iskey); 784 if (iskey) { 785 create_pidfile(getpid()); /* write pid to file */ 786 create_linkpidfile(getpid()); 787 } 788 } 789 790 /* 791 * detach - detach us from the controlling terminal. 792 */ 793 void 794 detach() 795 { 796 int pid; 797 char numbuf[16]; 798 int pipefd[2]; 799 800 if (detached) 801 return; 802 if (pipe(pipefd) == -1) 803 pipefd[0] = pipefd[1] = -1; 804 if ((pid = fork()) < 0) { 805 error("Couldn't detach (fork failed: %m)"); 806 die(1); /* or just return? */ 807 } 808 if (pid != 0) { 809 /* parent */ 810 notify(pidchange, pid); 811 /* update pid files if they have been written already */ 812 if (pidfilename[0]) 813 create_pidfile(pid); 814 if (linkpidfile[0]) 815 create_linkpidfile(pid); 816 exit(0); /* parent dies */ 817 } 818 setsid(); 819 chdir("/"); 820 dup2(fd_devnull, 0); 821 dup2(fd_devnull, 1); 822 dup2(fd_devnull, 2); 823 detached = 1; 824 if (log_default) 825 log_to_fd = -1; 826 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 827 script_setenv("PPPD_PID", numbuf, 1); 828 829 /* wait for parent to finish updating pid & lock files and die */ 830 close(pipefd[1]); 831 complete_read(pipefd[0], numbuf, 1); 832 close(pipefd[0]); 833 } 834 835 /* 836 * reopen_log - (re)open our connection to syslog. 837 */ 838 void 839 reopen_log() 840 { 841 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); 842 setlogmask(LOG_UPTO(LOG_INFO)); 843 } 844 845 /* 846 * Create a file containing our process ID. 847 */ 848 static void 849 create_pidfile(pid) 850 int pid; 851 { 852 #if !defined(__ANDROID__) 853 FILE *pidfile; 854 855 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", 856 _PATH_VARRUN, ifname); 857 if ((pidfile = fopen(pidfilename, "w")) != NULL) { 858 fprintf(pidfile, "%d\n", pid); 859 (void) fclose(pidfile); 860 } else { 861 error("Failed to create pid file %s: %m", pidfilename); 862 pidfilename[0] = 0; 863 } 864 #endif 865 } 866 867 void 868 create_linkpidfile(pid) 869 int pid; 870 { 871 #if !defined(__ANDROID__) 872 FILE *pidfile; 873 874 if (linkname[0] == 0) 875 return; 876 script_setenv("LINKNAME", linkname, 1); 877 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", 878 _PATH_VARRUN, linkname); 879 if ((pidfile = fopen(linkpidfile, "w")) != NULL) { 880 fprintf(pidfile, "%d\n", pid); 881 if (ifname[0]) 882 fprintf(pidfile, "%s\n", ifname); 883 (void) fclose(pidfile); 884 } else { 885 error("Failed to create pid file %s: %m", linkpidfile); 886 linkpidfile[0] = 0; 887 } 888 #endif 889 } 890 891 /* 892 * remove_pidfile - remove our pid files 893 */ 894 void remove_pidfiles() 895 { 896 #if !defined(__ANDROID__) 897 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) 898 warn("unable to delete pid file %s: %m", pidfilename); 899 pidfilename[0] = 0; 900 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT) 901 warn("unable to delete pid file %s: %m", linkpidfile); 902 linkpidfile[0] = 0; 903 #endif 904 } 905 906 /* 907 * holdoff_end - called via a timeout when the holdoff period ends. 908 */ 909 static void 910 holdoff_end(arg) 911 void *arg; 912 { 913 new_phase(PHASE_DORMANT); 914 } 915 916 /* List of protocol names, to make our messages a little more informative. */ 917 struct protocol_list { 918 u_short proto; 919 const char *name; 920 } protocol_list[] = { 921 { 0x21, "IP" }, 922 { 0x23, "OSI Network Layer" }, 923 { 0x25, "Xerox NS IDP" }, 924 { 0x27, "DECnet Phase IV" }, 925 { 0x29, "Appletalk" }, 926 { 0x2b, "Novell IPX" }, 927 { 0x2d, "VJ compressed TCP/IP" }, 928 { 0x2f, "VJ uncompressed TCP/IP" }, 929 { 0x31, "Bridging PDU" }, 930 { 0x33, "Stream Protocol ST-II" }, 931 { 0x35, "Banyan Vines" }, 932 { 0x39, "AppleTalk EDDP" }, 933 { 0x3b, "AppleTalk SmartBuffered" }, 934 { 0x3d, "Multi-Link" }, 935 { 0x3f, "NETBIOS Framing" }, 936 { 0x41, "Cisco Systems" }, 937 { 0x43, "Ascom Timeplex" }, 938 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 939 { 0x47, "DCA Remote Lan" }, 940 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, 941 { 0x4b, "SNA over 802.2" }, 942 { 0x4d, "SNA" }, 943 { 0x4f, "IP6 Header Compression" }, 944 { 0x51, "KNX Bridging Data" }, 945 { 0x53, "Encryption" }, 946 { 0x55, "Individual Link Encryption" }, 947 { 0x57, "IPv6" }, 948 { 0x59, "PPP Muxing" }, 949 { 0x5b, "Vendor-Specific Network Protocol" }, 950 { 0x61, "RTP IPHC Full Header" }, 951 { 0x63, "RTP IPHC Compressed TCP" }, 952 { 0x65, "RTP IPHC Compressed non-TCP" }, 953 { 0x67, "RTP IPHC Compressed UDP 8" }, 954 { 0x69, "RTP IPHC Compressed RTP 8" }, 955 { 0x6f, "Stampede Bridging" }, 956 { 0x73, "MP+" }, 957 { 0xc1, "NTCITS IPI" }, 958 { 0xfb, "single-link compression" }, 959 { 0xfd, "Compressed Datagram" }, 960 { 0x0201, "802.1d Hello Packets" }, 961 { 0x0203, "IBM Source Routing BPDU" }, 962 { 0x0205, "DEC LANBridge100 Spanning Tree" }, 963 { 0x0207, "Cisco Discovery Protocol" }, 964 { 0x0209, "Netcs Twin Routing" }, 965 { 0x020b, "STP - Scheduled Transfer Protocol" }, 966 { 0x020d, "EDP - Extreme Discovery Protocol" }, 967 { 0x0211, "Optical Supervisory Channel Protocol" }, 968 { 0x0213, "Optical Supervisory Channel Protocol" }, 969 { 0x0231, "Luxcom" }, 970 { 0x0233, "Sigma Network Systems" }, 971 { 0x0235, "Apple Client Server Protocol" }, 972 { 0x0281, "MPLS Unicast" }, 973 { 0x0283, "MPLS Multicast" }, 974 { 0x0285, "IEEE p1284.4 standard - data packets" }, 975 { 0x0287, "ETSI TETRA Network Protocol Type 1" }, 976 { 0x0289, "Multichannel Flow Treatment Protocol" }, 977 { 0x2063, "RTP IPHC Compressed TCP No Delta" }, 978 { 0x2065, "RTP IPHC Context State" }, 979 { 0x2067, "RTP IPHC Compressed UDP 16" }, 980 { 0x2069, "RTP IPHC Compressed RTP 16" }, 981 { 0x4001, "Cray Communications Control Protocol" }, 982 { 0x4003, "CDPD Mobile Network Registration Protocol" }, 983 { 0x4005, "Expand accelerator protocol" }, 984 { 0x4007, "ODSICP NCP" }, 985 { 0x4009, "DOCSIS DLL" }, 986 { 0x400B, "Cetacean Network Detection Protocol" }, 987 { 0x4021, "Stacker LZS" }, 988 { 0x4023, "RefTek Protocol" }, 989 { 0x4025, "Fibre Channel" }, 990 { 0x4027, "EMIT Protocols" }, 991 { 0x405b, "Vendor-Specific Protocol (VSP)" }, 992 { 0x8021, "Internet Protocol Control Protocol" }, 993 { 0x8023, "OSI Network Layer Control Protocol" }, 994 { 0x8025, "Xerox NS IDP Control Protocol" }, 995 { 0x8027, "DECnet Phase IV Control Protocol" }, 996 { 0x8029, "Appletalk Control Protocol" }, 997 { 0x802b, "Novell IPX Control Protocol" }, 998 { 0x8031, "Bridging NCP" }, 999 { 0x8033, "Stream Protocol Control Protocol" }, 1000 { 0x8035, "Banyan Vines Control Protocol" }, 1001 { 0x803d, "Multi-Link Control Protocol" }, 1002 { 0x803f, "NETBIOS Framing Control Protocol" }, 1003 { 0x8041, "Cisco Systems Control Protocol" }, 1004 { 0x8043, "Ascom Timeplex" }, 1005 { 0x8045, "Fujitsu LBLB Control Protocol" }, 1006 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 1007 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 1008 { 0x804b, "SNA over 802.2 Control Protocol" }, 1009 { 0x804d, "SNA Control Protocol" }, 1010 { 0x804f, "IP6 Header Compression Control Protocol" }, 1011 { 0x8051, "KNX Bridging Control Protocol" }, 1012 { 0x8053, "Encryption Control Protocol" }, 1013 { 0x8055, "Individual Link Encryption Control Protocol" }, 1014 { 0x8057, "IPv6 Control Protocol" }, 1015 { 0x8059, "PPP Muxing Control Protocol" }, 1016 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" }, 1017 { 0x806f, "Stampede Bridging Control Protocol" }, 1018 { 0x8073, "MP+ Control Protocol" }, 1019 { 0x80c1, "NTCITS IPI Control Protocol" }, 1020 { 0x80fb, "Single Link Compression Control Protocol" }, 1021 { 0x80fd, "Compression Control Protocol" }, 1022 { 0x8207, "Cisco Discovery Protocol Control" }, 1023 { 0x8209, "Netcs Twin Routing" }, 1024 { 0x820b, "STP - Control Protocol" }, 1025 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" }, 1026 { 0x8235, "Apple Client Server Protocol Control" }, 1027 { 0x8281, "MPLSCP" }, 1028 { 0x8285, "IEEE p1284.4 standard - Protocol Control" }, 1029 { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, 1030 { 0x8289, "Multichannel Flow Treatment Protocol" }, 1031 { 0xc021, "Link Control Protocol" }, 1032 { 0xc023, "Password Authentication Protocol" }, 1033 { 0xc025, "Link Quality Report" }, 1034 { 0xc027, "Shiva Password Authentication Protocol" }, 1035 { 0xc029, "CallBack Control Protocol (CBCP)" }, 1036 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" }, 1037 { 0xc02d, "BAP" }, 1038 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" }, 1039 { 0xc081, "Container Control Protocol" }, 1040 { 0xc223, "Challenge Handshake Authentication Protocol" }, 1041 { 0xc225, "RSA Authentication Protocol" }, 1042 { 0xc227, "Extensible Authentication Protocol" }, 1043 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" }, 1044 { 0xc26f, "Stampede Bridging Authorization Protocol" }, 1045 { 0xc281, "Proprietary Authentication Protocol" }, 1046 { 0xc283, "Proprietary Authentication Protocol" }, 1047 { 0xc481, "Proprietary Node ID Authentication Protocol" }, 1048 { 0, NULL }, 1049 }; 1050 1051 /* 1052 * protocol_name - find a name for a PPP protocol. 1053 */ 1054 const char * 1055 protocol_name(proto) 1056 int proto; 1057 { 1058 struct protocol_list *lp; 1059 1060 for (lp = protocol_list; lp->proto != 0; ++lp) 1061 if (proto == lp->proto) 1062 return lp->name; 1063 return NULL; 1064 } 1065 1066 /* 1067 * get_input - called when incoming data is available. 1068 */ 1069 static void 1070 get_input() 1071 { 1072 int len, i; 1073 u_char *p; 1074 u_short protocol; 1075 struct protent *protp; 1076 1077 p = inpacket_buf; /* point to beginning of packet buffer */ 1078 1079 len = read_packet(inpacket_buf); 1080 if (len < 0) 1081 return; 1082 1083 if (len == 0) { 1084 if (bundle_eof && multilink_master) { 1085 notice("Last channel has disconnected"); 1086 mp_bundle_terminated(); 1087 return; 1088 } 1089 notice("Modem hangup"); 1090 hungup = 1; 1091 status = EXIT_HANGUP; 1092 lcp_lowerdown(0); /* serial link is no longer available */ 1093 link_terminated(0); 1094 return; 1095 } 1096 1097 if (len < PPP_HDRLEN) { 1098 dbglog("received short packet:%.*B", len, p); 1099 return; 1100 } 1101 1102 dump_packet("rcvd", p, len); 1103 if (snoop_recv_hook) snoop_recv_hook(p, len); 1104 1105 p += 2; /* Skip address and control */ 1106 GETSHORT(protocol, p); 1107 len -= PPP_HDRLEN; 1108 1109 /* 1110 * Toss all non-LCP packets unless LCP is OPEN. 1111 */ 1112 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { 1113 dbglog("Discarded non-LCP packet when LCP not open"); 1114 return; 1115 } 1116 1117 /* 1118 * Until we get past the authentication phase, toss all packets 1119 * except LCP, LQR and authentication packets. 1120 */ 1121 if (phase <= PHASE_AUTHENTICATE 1122 && !(protocol == PPP_LCP || protocol == PPP_LQR 1123 || protocol == PPP_PAP || protocol == PPP_CHAP || 1124 protocol == PPP_EAP)) { 1125 dbglog("discarding proto 0x%x in phase %d", 1126 protocol, phase); 1127 return; 1128 } 1129 1130 /* 1131 * Upcall the proper protocol input routine. 1132 */ 1133 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 1134 if (protp->protocol == protocol && protp->enabled_flag) { 1135 (*protp->input)(0, p, len); 1136 return; 1137 } 1138 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag 1139 && protp->datainput != NULL) { 1140 (*protp->datainput)(0, p, len); 1141 return; 1142 } 1143 } 1144 1145 if (debug) { 1146 const char *pname = protocol_name(protocol); 1147 if (pname != NULL) 1148 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); 1149 else 1150 warn("Unsupported protocol 0x%x received", protocol); 1151 } 1152 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); 1153 } 1154 1155 /* 1156 * ppp_send_config - configure the transmit-side characteristics of 1157 * the ppp interface. Returns -1, indicating an error, if the channel 1158 * send_config procedure called error() (or incremented error_count 1159 * itself), otherwise 0. 1160 */ 1161 int 1162 ppp_send_config(unit, mtu, accm, pcomp, accomp) 1163 int unit, mtu; 1164 u_int32_t accm; 1165 int pcomp, accomp; 1166 { 1167 int errs; 1168 1169 if (the_channel->send_config == NULL) 1170 return 0; 1171 errs = error_count; 1172 (*the_channel->send_config)(mtu, accm, pcomp, accomp); 1173 return (error_count != errs)? -1: 0; 1174 } 1175 1176 /* 1177 * ppp_recv_config - configure the receive-side characteristics of 1178 * the ppp interface. Returns -1, indicating an error, if the channel 1179 * recv_config procedure called error() (or incremented error_count 1180 * itself), otherwise 0. 1181 */ 1182 int 1183 ppp_recv_config(unit, mru, accm, pcomp, accomp) 1184 int unit, mru; 1185 u_int32_t accm; 1186 int pcomp, accomp; 1187 { 1188 int errs; 1189 1190 if (the_channel->recv_config == NULL) 1191 return 0; 1192 errs = error_count; 1193 (*the_channel->recv_config)(mru, accm, pcomp, accomp); 1194 return (error_count != errs)? -1: 0; 1195 } 1196 1197 /* 1198 * new_phase - signal the start of a new phase of pppd's operation. 1199 */ 1200 void 1201 new_phase(p) 1202 int p; 1203 { 1204 phase = p; 1205 if (new_phase_hook) 1206 (*new_phase_hook)(p); 1207 notify(phasechange, p); 1208 } 1209 1210 /* 1211 * die - clean up state and exit with the specified status. 1212 */ 1213 void 1214 die(status) 1215 int status; 1216 { 1217 if (!doing_multilink || multilink_master) 1218 print_link_stats(); 1219 cleanup(); 1220 notify(exitnotify, status); 1221 syslog(LOG_INFO, "Exit."); 1222 exit(status); 1223 } 1224 1225 /* 1226 * cleanup - restore anything which needs to be restored before we exit 1227 */ 1228 /* ARGSUSED */ 1229 static void 1230 cleanup() 1231 { 1232 sys_cleanup(); 1233 1234 if (fd_ppp >= 0) 1235 the_channel->disestablish_ppp(devfd); 1236 if (the_channel->cleanup) 1237 (*the_channel->cleanup)(); 1238 remove_pidfiles(); 1239 1240 #ifdef USE_TDB 1241 if (pppdb != NULL) 1242 cleanup_db(); 1243 #endif 1244 1245 } 1246 1247 void 1248 print_link_stats() 1249 { 1250 /* 1251 * Print connect time and statistics. 1252 */ 1253 if (link_stats_valid) { 1254 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ 1255 info("Connect time %d.%d minutes.", t/10, t%10); 1256 info("Sent %u bytes, received %u bytes.", 1257 link_stats.bytes_out, link_stats.bytes_in); 1258 link_stats_valid = 0; 1259 } 1260 } 1261 1262 /* 1263 * reset_link_stats - "reset" stats when link goes up. 1264 */ 1265 void 1266 reset_link_stats(u) 1267 int u; 1268 { 1269 if (!get_ppp_stats(u, &old_link_stats)) 1270 return; 1271 gettimeofday(&start_time, NULL); 1272 } 1273 1274 /* 1275 * update_link_stats - get stats at link termination. 1276 */ 1277 void 1278 update_link_stats(u) 1279 int u; 1280 { 1281 struct timeval now; 1282 char numbuf[32]; 1283 1284 if (!get_ppp_stats(u, &link_stats) 1285 || gettimeofday(&now, NULL) < 0) 1286 return; 1287 link_connect_time = now.tv_sec - start_time.tv_sec; 1288 link_stats_valid = 1; 1289 1290 link_stats.bytes_in -= old_link_stats.bytes_in; 1291 link_stats.bytes_out -= old_link_stats.bytes_out; 1292 link_stats.pkts_in -= old_link_stats.pkts_in; 1293 link_stats.pkts_out -= old_link_stats.pkts_out; 1294 1295 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time); 1296 script_setenv("CONNECT_TIME", numbuf, 0); 1297 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out); 1298 script_setenv("BYTES_SENT", numbuf, 0); 1299 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in); 1300 script_setenv("BYTES_RCVD", numbuf, 0); 1301 } 1302 1303 1304 struct callout { 1305 struct timeval c_time; /* time at which to call routine */ 1306 void *c_arg; /* argument to routine */ 1307 void (*c_func) __P((void *)); /* routine */ 1308 struct callout *c_next; 1309 }; 1310 1311 static struct callout *callout = NULL; /* Callout list */ 1312 static struct timeval timenow; /* Current time */ 1313 1314 /* 1315 * timeout - Schedule a timeout. 1316 */ 1317 void 1318 timeout(func, arg, secs, usecs) 1319 void (*func) __P((void *)); 1320 void *arg; 1321 int secs, usecs; 1322 { 1323 struct callout *newp, *p, **pp; 1324 1325 /* 1326 * Allocate timeout. 1327 */ 1328 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) 1329 fatal("Out of memory in timeout()!"); 1330 newp->c_arg = arg; 1331 newp->c_func = func; 1332 gettimeofday(&timenow, NULL); 1333 newp->c_time.tv_sec = timenow.tv_sec + secs; 1334 newp->c_time.tv_usec = timenow.tv_usec + usecs; 1335 if (newp->c_time.tv_usec >= 1000000) { 1336 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000; 1337 newp->c_time.tv_usec %= 1000000; 1338 } 1339 1340 /* 1341 * Find correct place and link it in. 1342 */ 1343 for (pp = &callout; (p = *pp); pp = &p->c_next) 1344 if (newp->c_time.tv_sec < p->c_time.tv_sec 1345 || (newp->c_time.tv_sec == p->c_time.tv_sec 1346 && newp->c_time.tv_usec < p->c_time.tv_usec)) 1347 break; 1348 newp->c_next = p; 1349 *pp = newp; 1350 } 1351 1352 1353 /* 1354 * untimeout - Unschedule a timeout. 1355 */ 1356 void 1357 untimeout(func, arg) 1358 void (*func) __P((void *)); 1359 void *arg; 1360 { 1361 struct callout **copp, *freep; 1362 1363 /* 1364 * Find first matching timeout and remove it from the list. 1365 */ 1366 for (copp = &callout; (freep = *copp); copp = &freep->c_next) 1367 if (freep->c_func == func && freep->c_arg == arg) { 1368 *copp = freep->c_next; 1369 free((char *) freep); 1370 break; 1371 } 1372 } 1373 1374 1375 /* 1376 * calltimeout - Call any timeout routines which are now due. 1377 */ 1378 static void 1379 calltimeout() 1380 { 1381 struct callout *p; 1382 1383 while (callout != NULL) { 1384 p = callout; 1385 1386 if (gettimeofday(&timenow, NULL) < 0) 1387 fatal("Failed to get time of day: %m"); 1388 if (!(p->c_time.tv_sec < timenow.tv_sec 1389 || (p->c_time.tv_sec == timenow.tv_sec 1390 && p->c_time.tv_usec <= timenow.tv_usec))) 1391 break; /* no, it's not time yet */ 1392 1393 callout = p->c_next; 1394 (*p->c_func)(p->c_arg); 1395 1396 free((char *) p); 1397 } 1398 } 1399 1400 1401 /* 1402 * timeleft - return the length of time until the next timeout is due. 1403 */ 1404 static struct timeval * 1405 timeleft(tvp) 1406 struct timeval *tvp; 1407 { 1408 if (callout == NULL) 1409 return NULL; 1410 1411 gettimeofday(&timenow, NULL); 1412 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; 1413 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; 1414 if (tvp->tv_usec < 0) { 1415 tvp->tv_usec += 1000000; 1416 tvp->tv_sec -= 1; 1417 } 1418 if (tvp->tv_sec < 0) 1419 tvp->tv_sec = tvp->tv_usec = 0; 1420 1421 return tvp; 1422 } 1423 1424 1425 /* 1426 * kill_my_pg - send a signal to our process group, and ignore it ourselves. 1427 * We assume that sig is currently blocked. 1428 */ 1429 static void 1430 kill_my_pg(sig) 1431 int sig; 1432 { 1433 struct sigaction act, oldact; 1434 struct subprocess *chp; 1435 1436 if (!detached) { 1437 /* 1438 * There might be other things in our process group that we 1439 * didn't start that would get hit if we did a kill(0), so 1440 * just send the signal individually to our children. 1441 */ 1442 for (chp = children; chp != NULL; chp = chp->next) 1443 if (chp->killable) 1444 kill(chp->pid, sig); 1445 return; 1446 } 1447 1448 /* We've done a setsid(), so we can just use a kill(0) */ 1449 sigemptyset(&act.sa_mask); /* unnecessary in fact */ 1450 act.sa_handler = SIG_IGN; 1451 act.sa_flags = 0; 1452 kill(0, sig); 1453 /* 1454 * The kill() above made the signal pending for us, as well as 1455 * the rest of our process group, but we don't want it delivered 1456 * to us. It is blocked at the moment. Setting it to be ignored 1457 * will cause the pending signal to be discarded. If we did the 1458 * kill() after setting the signal to be ignored, it is unspecified 1459 * (by POSIX) whether the signal is immediately discarded or left 1460 * pending, and in fact Linux would leave it pending, and so it 1461 * would be delivered after the current signal handler exits, 1462 * leading to an infinite loop. 1463 */ 1464 sigaction(sig, &act, &oldact); 1465 sigaction(sig, &oldact, NULL); 1466 } 1467 1468 1469 /* 1470 * hup - Catch SIGHUP signal. 1471 * 1472 * Indicates that the physical layer has been disconnected. 1473 * We don't rely on this indication; if the user has sent this 1474 * signal, we just take the link down. 1475 */ 1476 static void 1477 hup(sig) 1478 int sig; 1479 { 1480 /* can't log a message here, it can deadlock */ 1481 got_sighup = 1; 1482 if (conn_running) 1483 /* Send the signal to the [dis]connector process(es) also */ 1484 kill_my_pg(sig); 1485 notify(sigreceived, sig); 1486 if (waiting) 1487 siglongjmp(sigjmp, 1); 1488 } 1489 1490 1491 /* 1492 * term - Catch SIGTERM signal and SIGINT signal (^C/del). 1493 * 1494 * Indicates that we should initiate a graceful disconnect and exit. 1495 */ 1496 /*ARGSUSED*/ 1497 static void 1498 term(sig) 1499 int sig; 1500 { 1501 /* can't log a message here, it can deadlock */ 1502 got_sigterm = sig; 1503 if (conn_running) 1504 /* Send the signal to the [dis]connector process(es) also */ 1505 kill_my_pg(sig); 1506 notify(sigreceived, sig); 1507 if (waiting) 1508 siglongjmp(sigjmp, 1); 1509 } 1510 1511 1512 /* 1513 * chld - Catch SIGCHLD signal. 1514 * Sets a flag so we will call reap_kids in the mainline. 1515 */ 1516 static void 1517 chld(sig) 1518 int sig; 1519 { 1520 got_sigchld = 1; 1521 if (waiting) 1522 siglongjmp(sigjmp, 1); 1523 } 1524 1525 1526 /* 1527 * toggle_debug - Catch SIGUSR1 signal. 1528 * 1529 * Toggle debug flag. 1530 */ 1531 /*ARGSUSED*/ 1532 static void 1533 toggle_debug(sig) 1534 int sig; 1535 { 1536 debug = !debug; 1537 if (debug) { 1538 setlogmask(LOG_UPTO(LOG_DEBUG)); 1539 } else { 1540 setlogmask(LOG_UPTO(LOG_WARNING)); 1541 } 1542 } 1543 1544 1545 /* 1546 * open_ccp - Catch SIGUSR2 signal. 1547 * 1548 * Try to (re)negotiate compression. 1549 */ 1550 /*ARGSUSED*/ 1551 static void 1552 open_ccp(sig) 1553 int sig; 1554 { 1555 got_sigusr2 = 1; 1556 if (waiting) 1557 siglongjmp(sigjmp, 1); 1558 } 1559 1560 1561 /* 1562 * bad_signal - We've caught a fatal signal. Clean up state and exit. 1563 */ 1564 static void 1565 bad_signal(sig) 1566 int sig; 1567 { 1568 static int crashed = 0; 1569 1570 if (crashed) 1571 _exit(127); 1572 crashed = 1; 1573 error("Fatal signal %d", sig); 1574 if (conn_running) 1575 kill_my_pg(SIGTERM); 1576 notify(sigreceived, sig); 1577 die(127); 1578 } 1579 1580 /* 1581 * safe_fork - Create a child process. The child closes all the 1582 * file descriptors that we don't want to leak to a script. 1583 * The parent waits for the child to do this before returning. 1584 * This also arranges for the specified fds to be dup'd to 1585 * fds 0, 1, 2 in the child. 1586 */ 1587 pid_t 1588 safe_fork(int infd, int outfd, int errfd) 1589 { 1590 pid_t pid; 1591 int fd, pipefd[2]; 1592 char buf[1]; 1593 1594 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */ 1595 while ((fd = dup(fd_devnull)) >= 0) { 1596 if (fd > 2) { 1597 close(fd); 1598 break; 1599 } 1600 } 1601 1602 if (pipe(pipefd) == -1) 1603 pipefd[0] = pipefd[1] = -1; 1604 pid = fork(); 1605 if (pid < 0) { 1606 error("fork failed: %m"); 1607 return -1; 1608 } 1609 if (pid > 0) { 1610 /* parent */ 1611 close(pipefd[1]); 1612 /* this read() blocks until the close(pipefd[1]) below */ 1613 complete_read(pipefd[0], buf, 1); 1614 close(pipefd[0]); 1615 return pid; 1616 } 1617 1618 /* Executing in the child */ 1619 sys_close(); 1620 #ifdef USE_TDB 1621 tdb_close(pppdb); 1622 #endif 1623 1624 /* make sure infd, outfd and errfd won't get tromped on below */ 1625 if (infd == 1 || infd == 2) 1626 infd = dup(infd); 1627 if (outfd == 0 || outfd == 2) 1628 outfd = dup(outfd); 1629 if (errfd == 0 || errfd == 1) 1630 errfd = dup(errfd); 1631 1632 closelog(); 1633 1634 /* dup the in, out, err fds to 0, 1, 2 */ 1635 if (infd != 0) 1636 dup2(infd, 0); 1637 if (outfd != 1) 1638 dup2(outfd, 1); 1639 if (errfd != 2) 1640 dup2(errfd, 2); 1641 1642 if (log_to_fd > 2) 1643 close(log_to_fd); 1644 if (the_channel->close) 1645 (*the_channel->close)(); 1646 else 1647 close(devfd); /* some plugins don't have a close function */ 1648 close(fd_ppp); 1649 close(fd_devnull); 1650 if (infd != 0) 1651 close(infd); 1652 if (outfd != 1) 1653 close(outfd); 1654 if (errfd != 2) 1655 close(errfd); 1656 1657 notify(fork_notifier, 0); 1658 close(pipefd[0]); 1659 /* this close unblocks the read() call above in the parent */ 1660 close(pipefd[1]); 1661 1662 return 0; 1663 } 1664 1665 static bool 1666 add_script_env(pos, newstring) 1667 int pos; 1668 char *newstring; 1669 { 1670 if (pos + 1 >= s_env_nalloc) { 1671 int new_n = pos + 17; 1672 char **newenv = realloc(script_env, new_n * sizeof(char *)); 1673 if (newenv == NULL) { 1674 free(newstring - 1); 1675 return 0; 1676 } 1677 script_env = newenv; 1678 s_env_nalloc = new_n; 1679 } 1680 script_env[pos] = newstring; 1681 script_env[pos + 1] = NULL; 1682 return 1; 1683 } 1684 1685 static void 1686 remove_script_env(pos) 1687 int pos; 1688 { 1689 free(script_env[pos] - 1); 1690 while ((script_env[pos] = script_env[pos + 1]) != NULL) 1691 pos++; 1692 } 1693 1694 /* 1695 * update_system_environment - process the list of set/unset options 1696 * and update the system environment. 1697 */ 1698 static void 1699 update_system_environment() 1700 { 1701 struct userenv *uep; 1702 1703 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1704 if (uep->ue_isset) 1705 setenv(uep->ue_name, uep->ue_value, 1); 1706 else 1707 unsetenv(uep->ue_name); 1708 } 1709 } 1710 1711 /* 1712 * device_script - run a program to talk to the specified fds 1713 * (e.g. to run the connector or disconnector script). 1714 * stderr gets connected to the log fd or to the _PATH_CONNERRS file. 1715 */ 1716 int 1717 device_script(program, in, out, dont_wait) 1718 char *program; 1719 int in, out; 1720 int dont_wait; 1721 { 1722 int pid; 1723 int status = -1; 1724 int errfd; 1725 1726 if (log_to_fd >= 0) 1727 errfd = log_to_fd; 1728 else 1729 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); 1730 1731 ++conn_running; 1732 pid = safe_fork(in, out, errfd); 1733 1734 if (pid != 0 && log_to_fd < 0) 1735 close(errfd); 1736 1737 if (pid < 0) { 1738 --conn_running; 1739 error("Failed to create child process: %m"); 1740 return -1; 1741 } 1742 1743 if (pid != 0) { 1744 record_child(pid, program, NULL, NULL, 1); 1745 status = 0; 1746 if (!dont_wait) { 1747 while (waitpid(pid, &status, 0) < 0) { 1748 if (errno == EINTR) 1749 continue; 1750 fatal("error waiting for (dis)connection process: %m"); 1751 } 1752 forget_child(pid, status); 1753 --conn_running; 1754 } 1755 return (status == 0 ? 0 : -1); 1756 } 1757 1758 /* here we are executing in the child */ 1759 1760 setgid(getgid()); 1761 setuid(uid); 1762 if (getuid() != uid) { 1763 fprintf(stderr, "pppd: setuid failed\n"); 1764 exit(1); 1765 } 1766 update_system_environment(); 1767 #if defined(__ANDROID__) 1768 execl("/system/bin/sh", "sh", "-c", program, NULL); 1769 #else 1770 execl("/bin/sh", "sh", "-c", program, (char *)0); 1771 #endif 1772 perror("pppd: could not exec /bin/sh"); 1773 _exit(99); 1774 /* NOTREACHED */ 1775 } 1776 1777 1778 /* 1779 * update_script_environment - process the list of set/unset options 1780 * and update the script environment. Note that we intentionally do 1781 * not update the TDB. These changes are layered on top right before 1782 * exec. It is not possible to use script_setenv() or 1783 * script_unsetenv() safely after this routine is run. 1784 */ 1785 static void 1786 update_script_environment() 1787 { 1788 struct userenv *uep; 1789 1790 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1791 int i; 1792 char *p, *newstring; 1793 int nlen = strlen(uep->ue_name); 1794 1795 for (i = 0; (p = script_env[i]) != NULL; i++) { 1796 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=') 1797 break; 1798 } 1799 if (uep->ue_isset) { 1800 nlen += strlen(uep->ue_value) + 2; 1801 newstring = malloc(nlen + 1); 1802 if (newstring == NULL) 1803 continue; 1804 *newstring++ = 0; 1805 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value); 1806 if (p != NULL) 1807 script_env[i] = newstring; 1808 else 1809 add_script_env(i, newstring); 1810 } else { 1811 remove_script_env(i); 1812 } 1813 } 1814 } 1815 1816 /* 1817 * run_program - execute a program with given arguments, 1818 * but don't wait for it unless wait is non-zero. 1819 * If the program can't be executed, logs an error unless 1820 * must_exist is 0 and the program file doesn't exist. 1821 * Returns -1 if it couldn't fork, 0 if the file doesn't exist 1822 * or isn't an executable plain file, or the process ID of the child. 1823 * If done != NULL, (*done)(arg) will be called later (within 1824 * reap_kids) iff the return value is > 0. 1825 */ 1826 pid_t 1827 run_program(prog, args, must_exist, done, arg, wait) 1828 char *prog; 1829 char **args; 1830 int must_exist; 1831 void (*done) __P((void *)); 1832 void *arg; 1833 int wait; 1834 { 1835 int pid, status; 1836 struct stat sbuf; 1837 1838 #if defined(__ANDROID__) 1839 /* Originally linkname is used to create named pid files, which is 1840 * meaningless to android. Here we use it as a suffix of program names, 1841 * so different users can run their own program by specifying it. For 1842 * example, "/etc/ppp/ip-up-vpn" will be executed when IPCP is up and 1843 * linkname is "vpn". Note that "/" is not allowed for security reasons. */ 1844 char file[MAXPATHLEN]; 1845 1846 if (linkname[0] && !strchr(linkname, '/')) { 1847 snprintf(file, MAXPATHLEN, "%s-%s", prog, linkname); 1848 file[MAXPATHLEN - 1] = '\0'; 1849 prog = file; 1850 } 1851 #endif 1852 1853 /* 1854 * First check if the file exists and is executable. 1855 * We don't use access() because that would use the 1856 * real user-id, which might not be root, and the script 1857 * might be accessible only to root. 1858 */ 1859 errno = EINVAL; 1860 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) 1861 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { 1862 if (must_exist || errno != ENOENT) 1863 warn("Can't execute %s: %m", prog); 1864 return 0; 1865 } 1866 1867 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull); 1868 if (pid == -1) { 1869 error("Failed to create child process for %s: %m", prog); 1870 return -1; 1871 } 1872 if (pid != 0) { 1873 if (debug) 1874 dbglog("Script %s started (pid %d)", prog, pid); 1875 record_child(pid, prog, done, arg, 0); 1876 if (wait) { 1877 while (waitpid(pid, &status, 0) < 0) { 1878 if (errno == EINTR) 1879 continue; 1880 fatal("error waiting for script %s: %m", prog); 1881 } 1882 forget_child(pid, status); 1883 } 1884 return pid; 1885 } 1886 1887 /* Leave the current location */ 1888 (void) setsid(); /* No controlling tty. */ 1889 (void) umask (S_IRWXG|S_IRWXO); 1890 (void) chdir ("/"); /* no current directory. */ 1891 setuid(0); /* set real UID = root */ 1892 setgid(getegid()); 1893 1894 #ifdef BSD 1895 /* Force the priority back to zero if pppd is running higher. */ 1896 if (setpriority (PRIO_PROCESS, 0, 0) < 0) 1897 warn("can't reset priority to 0: %m"); 1898 #endif 1899 1900 /* run the program */ 1901 update_script_environment(); 1902 execve(prog, args, script_env); 1903 if (must_exist || errno != ENOENT) { 1904 /* have to reopen the log, there's nowhere else 1905 for the message to go. */ 1906 reopen_log(); 1907 syslog(LOG_ERR, "Can't execute %s: %m", prog); 1908 closelog(); 1909 } 1910 _exit(99); 1911 } 1912 1913 1914 /* 1915 * record_child - add a child process to the list for reap_kids 1916 * to use. 1917 */ 1918 void 1919 record_child(pid, prog, done, arg, killable) 1920 int pid; 1921 char *prog; 1922 void (*done) __P((void *)); 1923 void *arg; 1924 int killable; 1925 { 1926 struct subprocess *chp; 1927 1928 ++n_children; 1929 1930 chp = (struct subprocess *) malloc(sizeof(struct subprocess)); 1931 if (chp == NULL) { 1932 warn("losing track of %s process", prog); 1933 } else { 1934 chp->pid = pid; 1935 chp->prog = prog; 1936 chp->done = done; 1937 chp->arg = arg; 1938 chp->next = children; 1939 chp->killable = killable; 1940 children = chp; 1941 } 1942 } 1943 1944 /* 1945 * childwait_end - we got fed up waiting for the child processes to 1946 * exit, send them all a SIGTERM. 1947 */ 1948 static void 1949 childwait_end(arg) 1950 void *arg; 1951 { 1952 struct subprocess *chp; 1953 1954 for (chp = children; chp != NULL; chp = chp->next) { 1955 if (debug) 1956 dbglog("sending SIGTERM to process %d", chp->pid); 1957 kill(chp->pid, SIGTERM); 1958 } 1959 childwait_done = 1; 1960 } 1961 1962 /* 1963 * forget_child - clean up after a dead child 1964 */ 1965 static void 1966 forget_child(pid, status) 1967 int pid, status; 1968 { 1969 struct subprocess *chp, **prevp; 1970 1971 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { 1972 if (chp->pid == pid) { 1973 --n_children; 1974 *prevp = chp->next; 1975 break; 1976 } 1977 } 1978 if (WIFSIGNALED(status)) { 1979 warn("Child process %s (pid %d) terminated with signal %d", 1980 (chp? chp->prog: "??"), pid, WTERMSIG(status)); 1981 } else if (debug) 1982 dbglog("Script %s finished (pid %d), status = 0x%x", 1983 (chp? chp->prog: "??"), pid, 1984 WIFEXITED(status) ? WEXITSTATUS(status) : status); 1985 if (chp && chp->done) 1986 (*chp->done)(chp->arg); 1987 if (chp) 1988 free(chp); 1989 } 1990 1991 /* 1992 * reap_kids - get status from any dead child processes, 1993 * and log a message for abnormal terminations. 1994 */ 1995 static int 1996 reap_kids() 1997 { 1998 int pid, status; 1999 2000 if (n_children == 0) 2001 return 0; 2002 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) { 2003 forget_child(pid, status); 2004 } 2005 if (pid == -1) { 2006 if (errno == ECHILD) 2007 return -1; 2008 if (errno != EINTR) 2009 error("Error waiting for child process: %m"); 2010 } 2011 return 0; 2012 } 2013 2014 /* 2015 * add_notifier - add a new function to be called when something happens. 2016 */ 2017 void 2018 add_notifier(notif, func, arg) 2019 struct notifier **notif; 2020 notify_func func; 2021 void *arg; 2022 { 2023 struct notifier *np; 2024 2025 np = malloc(sizeof(struct notifier)); 2026 if (np == 0) 2027 novm("notifier struct"); 2028 np->next = *notif; 2029 np->func = func; 2030 np->arg = arg; 2031 *notif = np; 2032 } 2033 2034 /* 2035 * remove_notifier - remove a function from the list of things to 2036 * be called when something happens. 2037 */ 2038 void 2039 remove_notifier(notif, func, arg) 2040 struct notifier **notif; 2041 notify_func func; 2042 void *arg; 2043 { 2044 struct notifier *np; 2045 2046 for (; (np = *notif) != 0; notif = &np->next) { 2047 if (np->func == func && np->arg == arg) { 2048 *notif = np->next; 2049 free(np); 2050 break; 2051 } 2052 } 2053 } 2054 2055 /* 2056 * notify - call a set of functions registered with add_notifier. 2057 */ 2058 void 2059 notify(notif, val) 2060 struct notifier *notif; 2061 int val; 2062 { 2063 struct notifier *np; 2064 2065 while ((np = notif) != 0) { 2066 notif = np->next; 2067 (*np->func)(np->arg, val); 2068 } 2069 } 2070 2071 /* 2072 * novm - log an error message saying we ran out of memory, and die. 2073 */ 2074 void 2075 novm(msg) 2076 char *msg; 2077 { 2078 fatal("Virtual memory exhausted allocating %s\n", msg); 2079 } 2080 2081 /* 2082 * script_setenv - set an environment variable value to be used 2083 * for scripts that we run (e.g. ip-up, auth-up, etc.) 2084 */ 2085 void 2086 script_setenv(var, value, iskey) 2087 char *var, *value; 2088 int iskey; 2089 { 2090 size_t varl = strlen(var); 2091 size_t vl = varl + strlen(value) + 2; 2092 int i; 2093 char *p, *newstring; 2094 2095 newstring = (char *) malloc(vl+1); 2096 if (newstring == 0) 2097 return; 2098 *newstring++ = iskey; 2099 slprintf(newstring, vl, "%s=%s", var, value); 2100 2101 /* check if this variable is already set */ 2102 if (script_env != 0) { 2103 for (i = 0; (p = script_env[i]) != 0; ++i) { 2104 if (strncmp(p, var, varl) == 0 && p[varl] == '=') { 2105 #ifdef USE_TDB 2106 if (p[-1] && pppdb != NULL) 2107 delete_db_key(p); 2108 #endif 2109 free(p-1); 2110 script_env[i] = newstring; 2111 #ifdef USE_TDB 2112 if (pppdb != NULL) { 2113 if (iskey) 2114 add_db_key(newstring); 2115 update_db_entry(); 2116 } 2117 #endif 2118 return; 2119 } 2120 } 2121 } else { 2122 /* no space allocated for script env. ptrs. yet */ 2123 i = 0; 2124 script_env = malloc(16 * sizeof(char *)); 2125 if (script_env == 0) { 2126 free(newstring - 1); 2127 return; 2128 } 2129 s_env_nalloc = 16; 2130 } 2131 2132 if (!add_script_env(i, newstring)) 2133 return; 2134 2135 #ifdef USE_TDB 2136 if (pppdb != NULL) { 2137 if (iskey) 2138 add_db_key(newstring); 2139 update_db_entry(); 2140 } 2141 #endif 2142 } 2143 2144 /* 2145 * script_unsetenv - remove a variable from the environment 2146 * for scripts. 2147 */ 2148 void 2149 script_unsetenv(var) 2150 char *var; 2151 { 2152 int vl = strlen(var); 2153 int i; 2154 char *p; 2155 2156 if (script_env == 0) 2157 return; 2158 for (i = 0; (p = script_env[i]) != 0; ++i) { 2159 if (strncmp(p, var, vl) == 0 && p[vl] == '=') { 2160 #ifdef USE_TDB 2161 if (p[-1] && pppdb != NULL) 2162 delete_db_key(p); 2163 #endif 2164 remove_script_env(i); 2165 break; 2166 } 2167 } 2168 #ifdef USE_TDB 2169 if (pppdb != NULL) 2170 update_db_entry(); 2171 #endif 2172 } 2173 2174 /* 2175 * Any arbitrary string used as a key for locking the database. 2176 * It doesn't matter what it is as long as all pppds use the same string. 2177 */ 2178 #define PPPD_LOCK_KEY "pppd lock" 2179 2180 /* 2181 * lock_db - get an exclusive lock on the TDB database. 2182 * Used to ensure atomicity of various lookup/modify operations. 2183 */ 2184 void lock_db() 2185 { 2186 #ifdef USE_TDB 2187 TDB_DATA key; 2188 2189 key.dptr = PPPD_LOCK_KEY; 2190 key.dsize = strlen(key.dptr); 2191 tdb_chainlock(pppdb, key); 2192 #endif 2193 } 2194 2195 /* 2196 * unlock_db - remove the exclusive lock obtained by lock_db. 2197 */ 2198 void unlock_db() 2199 { 2200 #ifdef USE_TDB 2201 TDB_DATA key; 2202 2203 key.dptr = PPPD_LOCK_KEY; 2204 key.dsize = strlen(key.dptr); 2205 tdb_chainunlock(pppdb, key); 2206 #endif 2207 } 2208 2209 #ifdef USE_TDB 2210 /* 2211 * update_db_entry - update our entry in the database. 2212 */ 2213 static void 2214 update_db_entry() 2215 { 2216 TDB_DATA key, dbuf; 2217 int vlen, i; 2218 char *p, *q, *vbuf; 2219 2220 if (script_env == NULL) 2221 return; 2222 vlen = 0; 2223 for (i = 0; (p = script_env[i]) != 0; ++i) 2224 vlen += strlen(p) + 1; 2225 vbuf = malloc(vlen + 1); 2226 if (vbuf == 0) 2227 novm("database entry"); 2228 q = vbuf; 2229 for (i = 0; (p = script_env[i]) != 0; ++i) 2230 q += slprintf(q, vbuf + vlen - q, "%s;", p); 2231 2232 key.dptr = db_key; 2233 key.dsize = strlen(db_key); 2234 dbuf.dptr = vbuf; 2235 dbuf.dsize = vlen; 2236 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2237 error("tdb_store failed: %s", tdb_errorstr(pppdb)); 2238 2239 if (vbuf) 2240 free(vbuf); 2241 2242 } 2243 2244 /* 2245 * add_db_key - add a key that we can use to look up our database entry. 2246 */ 2247 static void 2248 add_db_key(str) 2249 const char *str; 2250 { 2251 TDB_DATA key, dbuf; 2252 2253 key.dptr = (char *) str; 2254 key.dsize = strlen(str); 2255 dbuf.dptr = db_key; 2256 dbuf.dsize = strlen(db_key); 2257 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2258 error("tdb_store key failed: %s", tdb_errorstr(pppdb)); 2259 } 2260 2261 /* 2262 * delete_db_key - delete a key for looking up our database entry. 2263 */ 2264 static void 2265 delete_db_key(str) 2266 const char *str; 2267 { 2268 TDB_DATA key; 2269 2270 key.dptr = (char *) str; 2271 key.dsize = strlen(str); 2272 tdb_delete(pppdb, key); 2273 } 2274 2275 /* 2276 * cleanup_db - delete all the entries we put in the database. 2277 */ 2278 static void 2279 cleanup_db() 2280 { 2281 TDB_DATA key; 2282 int i; 2283 char *p; 2284 2285 key.dptr = db_key; 2286 key.dsize = strlen(db_key); 2287 tdb_delete(pppdb, key); 2288 for (i = 0; (p = script_env[i]) != 0; ++i) 2289 if (p[-1]) 2290 delete_db_key(p); 2291 } 2292 #endif /* USE_TDB */ 2293
