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 #if defined(__ANDROID__) 94 #include <cutils/properties.h> 95 #endif 96 97 #include "pppd.h" 98 #include "magic.h" 99 #include "fsm.h" 100 #include "lcp.h" 101 #include "ipcp.h" 102 #ifdef INET6 103 #include "ipv6cp.h" 104 #endif 105 #include "upap.h" 106 #include "chap-new.h" 107 #include "eap.h" 108 #include "ccp.h" 109 #include "ecp.h" 110 #include "pathnames.h" 111 112 #ifdef USE_TDB 113 #include "tdb.h" 114 #endif 115 116 #ifdef CBCP_SUPPORT 117 #include "cbcp.h" 118 #endif 119 120 #ifdef IPX_CHANGE 121 #include "ipxcp.h" 122 #endif /* IPX_CHANGE */ 123 #ifdef AT_CHANGE 124 #include "atcp.h" 125 #endif 126 127 static const char rcsid[] = RCSID; 128 129 /* interface vars */ 130 char ifname[32]; /* Interface name */ 131 int ifunit; /* Interface unit number */ 132 133 struct channel *the_channel; 134 135 char *progname; /* Name of this program */ 136 char hostname[MAXNAMELEN]; /* Our hostname */ 137 static char pidfilename[MAXPATHLEN]; /* name of pid file */ 138 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ 139 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ 140 uid_t uid; /* Our real user-id */ 141 struct notifier *pidchange = NULL; 142 struct notifier *phasechange = NULL; 143 struct notifier *exitnotify = NULL; 144 struct notifier *sigreceived = NULL; 145 struct notifier *fork_notifier = NULL; 146 147 int hungup; /* terminal has been hung up */ 148 int privileged; /* we're running as real uid root */ 149 int need_holdoff; /* need holdoff period before restarting */ 150 int detached; /* have detached from terminal */ 151 volatile int status; /* exit status for pppd */ 152 int unsuccess; /* # unsuccessful connection attempts */ 153 int do_callback; /* != 0 if we should do callback next */ 154 int doing_callback; /* != 0 if we are doing callback */ 155 int ppp_session_number; /* Session number, for channels with such a 156 concept (eg PPPoE) */ 157 int childwait_done; /* have timed out waiting for children */ 158 159 #ifdef USE_TDB 160 TDB_CONTEXT *pppdb; /* database for storing status etc. */ 161 #endif 162 163 char db_key[32]; 164 165 int (*holdoff_hook) __P((void)) = NULL; 166 int (*new_phase_hook) __P((int)) = NULL; 167 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL; 168 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL; 169 170 static int conn_running; /* we have a [dis]connector running */ 171 static int fd_loop; /* fd for getting demand-dial packets */ 172 173 int fd_devnull; /* fd for /dev/null */ 174 int devfd = -1; /* fd of underlying device */ 175 int fd_ppp = -1; /* fd for talking PPP */ 176 int phase; /* where the link is at */ 177 int kill_link; 178 int asked_to_quit; 179 int open_ccp_flag; 180 int listen_time; 181 int got_sigusr2; 182 int got_sigterm; 183 int got_sighup; 184 185 static sigset_t signals_handled; 186 static int waiting; 187 static sigjmp_buf sigjmp; 188 189 char **script_env; /* Env. variable values for scripts */ 190 int s_env_nalloc; /* # words avail at script_env */ 191 192 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ 193 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ 194 195 static int n_children; /* # child processes still running */ 196 static int got_sigchld; /* set if we have received a SIGCHLD */ 197 198 int privopen; /* don't lock, open device as root */ 199 200 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; 201 202 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ 203 int ngroups; /* How many groups valid in groups */ 204 205 static struct timeval start_time; /* Time when link was started. */ 206 207 static struct pppd_stats old_link_stats; 208 struct pppd_stats link_stats; 209 unsigned link_connect_time; 210 int link_stats_valid; 211 212 int error_count; 213 214 bool bundle_eof; 215 bool bundle_terminating; 216 217 /* 218 * We maintain a list of child process pids and 219 * functions to call when they exit. 220 */ 221 struct subprocess { 222 pid_t pid; 223 char *prog; 224 void (*done) __P((void *)); 225 void *arg; 226 int killable; 227 struct subprocess *next; 228 }; 229 230 static struct subprocess *children; 231 232 /* Prototypes for procedures local to this file. */ 233 234 static void setup_signals __P((void)); 235 static void create_pidfile __P((int pid)); 236 static void create_linkpidfile __P((int pid)); 237 static void cleanup __P((void)); 238 static void get_input __P((void)); 239 static void calltimeout __P((void)); 240 static struct timeval *timeleft __P((struct timeval *)); 241 static void kill_my_pg __P((int)); 242 static void hup __P((int)); 243 static void term __P((int)); 244 static void chld __P((int)); 245 static void toggle_debug __P((int)); 246 static void open_ccp __P((int)); 247 static void bad_signal __P((int)); 248 static void holdoff_end __P((void *)); 249 static void forget_child __P((int pid, int status)); 250 static int reap_kids __P((void)); 251 static void childwait_end __P((void *)); 252 253 #ifdef USE_TDB 254 static void update_db_entry __P((void)); 255 static void add_db_key __P((const char *)); 256 static void delete_db_key __P((const char *)); 257 static void cleanup_db __P((void)); 258 #endif 259 260 static void handle_events __P((void)); 261 void print_link_stats __P((void)); 262 263 extern char *ttyname __P((int)); 264 extern char *getlogin __P((void)); 265 int main __P((int, char *[])); 266 267 #ifdef ultrix 268 #undef O_NONBLOCK 269 #define O_NONBLOCK O_NDELAY 270 #endif 271 272 #ifdef ULTRIX 273 #define setlogmask(x) 274 #endif 275 276 /* 277 * PPP Data Link Layer "protocol" table. 278 * One entry per supported protocol. 279 * The last entry must be NULL. 280 */ 281 struct protent *protocols[] = { 282 &lcp_protent, 283 &pap_protent, 284 &chap_protent, 285 #ifdef CBCP_SUPPORT 286 &cbcp_protent, 287 #endif 288 &ipcp_protent, 289 #ifdef INET6 290 &ipv6cp_protent, 291 #endif 292 &ccp_protent, 293 &ecp_protent, 294 #ifdef IPX_CHANGE 295 &ipxcp_protent, 296 #endif 297 #ifdef AT_CHANGE 298 &atcp_protent, 299 #endif 300 &eap_protent, 301 NULL 302 }; 303 304 /* 305 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. 306 */ 307 #if !defined(PPP_DRV_NAME) 308 #define PPP_DRV_NAME "ppp" 309 #endif /* !defined(PPP_DRV_NAME) */ 310 311 int 312 main(argc, argv) 313 int argc; 314 char *argv[]; 315 { 316 int i, t; 317 char *p; 318 struct passwd *pw; 319 struct protent *protp; 320 char numbuf[16]; 321 322 link_stats_valid = 0; 323 new_phase(PHASE_INITIALIZE); 324 325 script_env = NULL; 326 327 /* Initialize syslog facilities */ 328 reopen_log(); 329 330 if (gethostname(hostname, MAXNAMELEN) < 0 ) { 331 option_error("Couldn't get hostname: %m"); 332 exit(1); 333 } 334 hostname[MAXNAMELEN-1] = 0; 335 336 /* make sure we don't create world or group writable files. */ 337 umask(umask(0777) | 022); 338 339 uid = getuid(); 340 privileged = uid == 0; 341 slprintf(numbuf, sizeof(numbuf), "%d", uid); 342 script_setenv("ORIG_UID", numbuf, 0); 343 344 ngroups = getgroups(NGROUPS_MAX, groups); 345 346 /* 347 * Initialize magic number generator now so that protocols may 348 * use magic numbers in initialization. 349 */ 350 magic_init(); 351 352 /* 353 * Initialize each protocol. 354 */ 355 for (i = 0; (protp = protocols[i]) != NULL; ++i) 356 (*protp->init)(0); 357 358 /* 359 * Initialize the default channel. 360 */ 361 tty_init(); 362 363 progname = *argv; 364 365 #if defined(__ANDROID__) 366 { 367 extern void pppox_init(); 368 pppox_init(); 369 privileged = 1; 370 } 371 { 372 char *envargs = getenv("envargs"); 373 if (envargs) { 374 int i; 375 /* Decode the arguments in-place and count the number of them. 376 * They were hex encoded using [A-P] instead of [0-9A-F]. */ 377 for (argc = 0, i = 0; envargs[i] && envargs[i + 1]; i += 2) { 378 char c = ((envargs[i] - 'A') << 4) + (envargs[i + 1] - 'A'); 379 if (c == 0) { 380 ++argc; 381 } 382 envargs[i / 2 + 1] = c; 383 } 384 if (argc == 0 || (argv = malloc(sizeof(char *) * argc)) == NULL) { 385 fatal("Failed to parse envargs!"); 386 } 387 for (envargs[0] = 0, i = 0; i < argc; ++envargs) { 388 if (envargs[0] == 0) { 389 argv[i++] = &envargs[1]; 390 } 391 } 392 } 393 } 394 #endif 395 396 /* 397 * Parse, in order, the system options file, the user's options file, 398 * and the command line arguments. 399 */ 400 #if defined(__ANDROID__) 401 /* Android: only take options from commandline */ 402 if (!parse_args(argc-1, argv+1)) 403 exit(EXIT_OPTION_ERROR); 404 405 #else 406 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) 407 || !options_from_user() 408 || !parse_args(argc-1, argv+1)) 409 exit(EXIT_OPTION_ERROR); 410 411 #endif 412 413 devnam_fixed = 1; /* can no longer change device name */ 414 415 /* 416 * Work out the device name, if it hasn't already been specified, 417 * and parse the tty's options file. 418 */ 419 if (the_channel->process_extra_options) 420 (*the_channel->process_extra_options)(); 421 422 if (debug) 423 setlogmask(LOG_UPTO(LOG_DEBUG)); 424 425 #if !defined(__ANDROID__) 426 /* 427 * Check that we are running as root. 428 */ 429 if (geteuid() != 0) { 430 option_error("must be root to run %s, since it is not setuid-root", 431 argv[0]); 432 exit(EXIT_NOT_ROOT); 433 } 434 #endif 435 436 if (!ppp_available()) { 437 option_error("%s", no_ppp_msg); 438 exit(EXIT_NO_KERNEL_SUPPORT); 439 } 440 441 /* 442 * Check that the options given are valid and consistent. 443 */ 444 check_options(); 445 if (!sys_check_options()) 446 exit(EXIT_OPTION_ERROR); 447 auth_check_options(); 448 #ifdef HAVE_MULTILINK 449 mp_check_options(); 450 #endif 451 for (i = 0; (protp = protocols[i]) != NULL; ++i) 452 if (protp->check_options != NULL) 453 (*protp->check_options)(); 454 if (the_channel->check_options) 455 (*the_channel->check_options)(); 456 457 458 if (dump_options || dryrun) { 459 init_pr_log(NULL, LOG_INFO); 460 print_options(pr_log, NULL); 461 end_pr_log(); 462 } 463 464 if (dryrun) 465 die(0); 466 467 /* Make sure fds 0, 1, 2 are open to somewhere. */ 468 fd_devnull = open(_PATH_DEVNULL, O_RDWR); 469 if (fd_devnull < 0) 470 fatal("Couldn't open %s: %m", _PATH_DEVNULL); 471 while (fd_devnull <= 2) { 472 i = dup(fd_devnull); 473 if (i < 0) 474 fatal("Critical shortage of file descriptors: dup failed: %m"); 475 fd_devnull = i; 476 } 477 478 /* 479 * Initialize system-dependent stuff. 480 */ 481 sys_init(); 482 #ifdef USE_TDB 483 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); 484 if (pppdb != NULL) { 485 slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); 486 update_db_entry(); 487 } else { 488 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); 489 if (multilink) { 490 warn("Warning: disabling multilink"); 491 multilink = 0; 492 } 493 } 494 #endif 495 496 /* 497 * Detach ourselves from the terminal, if required, 498 * and identify who is running us. 499 */ 500 if (!nodetach && !updetach) 501 detach(); 502 p = getlogin(); 503 if (p == NULL) { 504 pw = getpwuid(uid); 505 if (pw != NULL && pw->pw_name != NULL) 506 p = pw->pw_name; 507 else 508 p = "(unknown)"; 509 } 510 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid); 511 script_setenv("PPPLOGNAME", p, 0); 512 513 if (devnam[0]) 514 script_setenv("DEVICE", devnam, 1); 515 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 516 script_setenv("PPPD_PID", numbuf, 1); 517 518 setup_signals(); 519 520 create_linkpidfile(getpid()); 521 522 waiting = 0; 523 524 /* 525 * If we're doing dial-on-demand, set up the interface now. 526 */ 527 if (demand) { 528 /* 529 * Open the loopback channel and set it up to be the ppp interface. 530 */ 531 fd_loop = open_ppp_loopback(); 532 set_ifunit(1); 533 /* 534 * Configure the interface and mark it up, etc. 535 */ 536 demand_conf(); 537 } 538 539 do_callback = 0; 540 for (;;) { 541 542 bundle_eof = 0; 543 bundle_terminating = 0; 544 listen_time = 0; 545 need_holdoff = 1; 546 devfd = -1; 547 status = EXIT_OK; 548 ++unsuccess; 549 doing_callback = do_callback; 550 do_callback = 0; 551 552 if (demand && !doing_callback) { 553 /* 554 * Don't do anything until we see some activity. 555 */ 556 new_phase(PHASE_DORMANT); 557 demand_unblock(); 558 add_fd(fd_loop); 559 for (;;) { 560 handle_events(); 561 if (asked_to_quit) 562 break; 563 if (get_loop_output()) 564 break; 565 } 566 remove_fd(fd_loop); 567 if (asked_to_quit) 568 break; 569 570 /* 571 * Now we want to bring up the link. 572 */ 573 demand_block(); 574 info("Starting link"); 575 } 576 577 gettimeofday(&start_time, NULL); 578 script_unsetenv("CONNECT_TIME"); 579 script_unsetenv("BYTES_SENT"); 580 script_unsetenv("BYTES_RCVD"); 581 582 lcp_open(0); /* Start protocol */ 583 start_link(0); 584 while (phase != PHASE_DEAD) { 585 handle_events(); 586 get_input(); 587 if (kill_link) 588 lcp_close(0, "User request"); 589 if (asked_to_quit) { 590 bundle_terminating = 1; 591 if (phase == PHASE_MASTER) 592 mp_bundle_terminated(); 593 } 594 if (open_ccp_flag) { 595 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { 596 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ 597 (*ccp_protent.open)(0); 598 } 599 } 600 } 601 /* restore FSMs to original state */ 602 lcp_close(0, ""); 603 604 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail)) 605 break; 606 607 if (demand) 608 demand_discard(); 609 t = need_holdoff? holdoff: 0; 610 if (holdoff_hook) 611 t = (*holdoff_hook)(); 612 if (t > 0) { 613 new_phase(PHASE_HOLDOFF); 614 TIMEOUT(holdoff_end, NULL, t); 615 do { 616 handle_events(); 617 if (kill_link) 618 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ 619 } while (phase == PHASE_HOLDOFF); 620 if (!persist) 621 break; 622 } 623 } 624 625 /* Wait for scripts to finish */ 626 reap_kids(); 627 if (n_children > 0) { 628 if (child_wait > 0) 629 TIMEOUT(childwait_end, NULL, child_wait); 630 if (debug) { 631 struct subprocess *chp; 632 dbglog("Waiting for %d child processes...", n_children); 633 for (chp = children; chp != NULL; chp = chp->next) 634 dbglog(" script %s, pid %d", chp->prog, chp->pid); 635 } 636 while (n_children > 0 && !childwait_done) { 637 handle_events(); 638 if (kill_link && !childwait_done) 639 childwait_end(NULL); 640 } 641 } 642 643 die(status); 644 return 0; 645 } 646 647 /* 648 * handle_events - wait for something to happen and respond to it. 649 */ 650 static void 651 handle_events() 652 { 653 struct timeval timo; 654 655 kill_link = open_ccp_flag = 0; 656 if (sigsetjmp(sigjmp, 1) == 0) { 657 sigprocmask(SIG_BLOCK, &signals_handled, NULL); 658 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { 659 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 660 } else { 661 waiting = 1; 662 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 663 wait_input(timeleft(&timo)); 664 } 665 } 666 waiting = 0; 667 calltimeout(); 668 if (got_sighup) { 669 info("Hangup (SIGHUP)"); 670 kill_link = 1; 671 got_sighup = 0; 672 if (status != EXIT_HANGUP) 673 status = EXIT_USER_REQUEST; 674 } 675 if (got_sigterm) { 676 info("Terminating on signal %d", got_sigterm); 677 kill_link = 1; 678 asked_to_quit = 1; 679 persist = 0; 680 status = EXIT_USER_REQUEST; 681 got_sigterm = 0; 682 } 683 if (got_sigchld) { 684 got_sigchld = 0; 685 reap_kids(); /* Don't leave dead kids lying around */ 686 } 687 if (got_sigusr2) { 688 open_ccp_flag = 1; 689 got_sigusr2 = 0; 690 } 691 } 692 693 /* 694 * setup_signals - initialize signal handling. 695 */ 696 static void 697 setup_signals() 698 { 699 struct sigaction sa; 700 701 /* 702 * Compute mask of all interesting signals and install signal handlers 703 * for each. Only one signal handler may be active at a time. Therefore, 704 * all other signals should be masked when any handler is executing. 705 */ 706 sigemptyset(&signals_handled); 707 sigaddset(&signals_handled, SIGHUP); 708 sigaddset(&signals_handled, SIGINT); 709 sigaddset(&signals_handled, SIGTERM); 710 sigaddset(&signals_handled, SIGCHLD); 711 sigaddset(&signals_handled, SIGUSR2); 712 713 #define SIGNAL(s, handler) do { \ 714 sa.sa_handler = handler; \ 715 if (sigaction(s, &sa, NULL) < 0) \ 716 fatal("Couldn't establish signal handler (%d): %m", s); \ 717 } while (0) 718 719 sa.sa_mask = signals_handled; 720 sa.sa_flags = 0; 721 SIGNAL(SIGHUP, hup); /* Hangup */ 722 SIGNAL(SIGINT, term); /* Interrupt */ 723 SIGNAL(SIGTERM, term); /* Terminate */ 724 SIGNAL(SIGCHLD, chld); 725 726 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ 727 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ 728 729 /* 730 * Install a handler for other signals which would otherwise 731 * cause pppd to exit without cleaning up. 732 */ 733 SIGNAL(SIGABRT, bad_signal); 734 SIGNAL(SIGALRM, bad_signal); 735 SIGNAL(SIGFPE, bad_signal); 736 SIGNAL(SIGILL, bad_signal); 737 SIGNAL(SIGPIPE, bad_signal); 738 SIGNAL(SIGQUIT, bad_signal); 739 SIGNAL(SIGSEGV, bad_signal); 740 #ifdef SIGBUS 741 SIGNAL(SIGBUS, bad_signal); 742 #endif 743 #ifdef SIGEMT 744 SIGNAL(SIGEMT, bad_signal); 745 #endif 746 #ifdef SIGPOLL 747 SIGNAL(SIGPOLL, bad_signal); 748 #endif 749 #ifdef SIGPROF 750 SIGNAL(SIGPROF, bad_signal); 751 #endif 752 #ifdef SIGSYS 753 SIGNAL(SIGSYS, bad_signal); 754 #endif 755 #ifdef SIGTRAP 756 SIGNAL(SIGTRAP, bad_signal); 757 #endif 758 #ifdef SIGVTALRM 759 SIGNAL(SIGVTALRM, bad_signal); 760 #endif 761 #ifdef SIGXCPU 762 SIGNAL(SIGXCPU, bad_signal); 763 #endif 764 #ifdef SIGXFSZ 765 SIGNAL(SIGXFSZ, bad_signal); 766 #endif 767 768 /* 769 * Apparently we can get a SIGPIPE when we call syslog, if 770 * syslogd has died and been restarted. Ignoring it seems 771 * be sufficient. 772 */ 773 signal(SIGPIPE, SIG_IGN); 774 } 775 776 /* 777 * set_ifunit - do things we need to do once we know which ppp 778 * unit we are using. 779 */ 780 void 781 set_ifunit(iskey) 782 int iskey; 783 { 784 info("Using interface %s%d", PPP_DRV_NAME, ifunit); 785 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit); 786 script_setenv("IFNAME", ifname, iskey); 787 if (iskey) { 788 create_pidfile(getpid()); /* write pid to file */ 789 create_linkpidfile(getpid()); 790 } 791 } 792 793 /* 794 * detach - detach us from the controlling terminal. 795 */ 796 void 797 detach() 798 { 799 int pid; 800 char numbuf[16]; 801 int pipefd[2]; 802 803 if (detached) 804 return; 805 if (pipe(pipefd) == -1) 806 pipefd[0] = pipefd[1] = -1; 807 if ((pid = fork()) < 0) { 808 error("Couldn't detach (fork failed: %m)"); 809 die(1); /* or just return? */ 810 } 811 if (pid != 0) { 812 /* parent */ 813 notify(pidchange, pid); 814 /* update pid files if they have been written already */ 815 if (pidfilename[0]) 816 create_pidfile(pid); 817 if (linkpidfile[0]) 818 create_linkpidfile(pid); 819 exit(0); /* parent dies */ 820 } 821 setsid(); 822 chdir("/"); 823 dup2(fd_devnull, 0); 824 dup2(fd_devnull, 1); 825 dup2(fd_devnull, 2); 826 detached = 1; 827 if (log_default) 828 log_to_fd = -1; 829 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 830 script_setenv("PPPD_PID", numbuf, 1); 831 832 /* wait for parent to finish updating pid & lock files and die */ 833 close(pipefd[1]); 834 complete_read(pipefd[0], numbuf, 1); 835 close(pipefd[0]); 836 } 837 838 /* 839 * reopen_log - (re)open our connection to syslog. 840 */ 841 void 842 reopen_log() 843 { 844 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); 845 setlogmask(LOG_UPTO(LOG_INFO)); 846 } 847 848 /* 849 * Create a file containing our process ID. 850 */ 851 static void 852 create_pidfile(pid) 853 int pid; 854 { 855 #if !defined(__ANDROID__) 856 FILE *pidfile; 857 858 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", 859 _PATH_VARRUN, ifname); 860 if ((pidfile = fopen(pidfilename, "w")) != NULL) { 861 fprintf(pidfile, "%d\n", pid); 862 (void) fclose(pidfile); 863 } else { 864 error("Failed to create pid file %s: %m", pidfilename); 865 pidfilename[0] = 0; 866 } 867 #endif 868 } 869 870 void 871 create_linkpidfile(pid) 872 int pid; 873 { 874 #if !defined(__ANDROID__) 875 FILE *pidfile; 876 877 if (linkname[0] == 0) 878 return; 879 script_setenv("LINKNAME", linkname, 1); 880 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", 881 _PATH_VARRUN, linkname); 882 if ((pidfile = fopen(linkpidfile, "w")) != NULL) { 883 fprintf(pidfile, "%d\n", pid); 884 if (ifname[0]) 885 fprintf(pidfile, "%s\n", ifname); 886 (void) fclose(pidfile); 887 } else { 888 error("Failed to create pid file %s: %m", linkpidfile); 889 linkpidfile[0] = 0; 890 } 891 #endif 892 } 893 894 /* 895 * remove_pidfile - remove our pid files 896 */ 897 void remove_pidfiles() 898 { 899 #if !defined(__ANDROID__) 900 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) 901 warn("unable to delete pid file %s: %m", pidfilename); 902 pidfilename[0] = 0; 903 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT) 904 warn("unable to delete pid file %s: %m", linkpidfile); 905 linkpidfile[0] = 0; 906 #endif 907 } 908 909 /* 910 * holdoff_end - called via a timeout when the holdoff period ends. 911 */ 912 static void 913 holdoff_end(arg) 914 void *arg; 915 { 916 new_phase(PHASE_DORMANT); 917 } 918 919 /* List of protocol names, to make our messages a little more informative. */ 920 struct protocol_list { 921 u_short proto; 922 const char *name; 923 } protocol_list[] = { 924 { 0x21, "IP" }, 925 { 0x23, "OSI Network Layer" }, 926 { 0x25, "Xerox NS IDP" }, 927 { 0x27, "DECnet Phase IV" }, 928 { 0x29, "Appletalk" }, 929 { 0x2b, "Novell IPX" }, 930 { 0x2d, "VJ compressed TCP/IP" }, 931 { 0x2f, "VJ uncompressed TCP/IP" }, 932 { 0x31, "Bridging PDU" }, 933 { 0x33, "Stream Protocol ST-II" }, 934 { 0x35, "Banyan Vines" }, 935 { 0x39, "AppleTalk EDDP" }, 936 { 0x3b, "AppleTalk SmartBuffered" }, 937 { 0x3d, "Multi-Link" }, 938 { 0x3f, "NETBIOS Framing" }, 939 { 0x41, "Cisco Systems" }, 940 { 0x43, "Ascom Timeplex" }, 941 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 942 { 0x47, "DCA Remote Lan" }, 943 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, 944 { 0x4b, "SNA over 802.2" }, 945 { 0x4d, "SNA" }, 946 { 0x4f, "IP6 Header Compression" }, 947 { 0x51, "KNX Bridging Data" }, 948 { 0x53, "Encryption" }, 949 { 0x55, "Individual Link Encryption" }, 950 { 0x57, "IPv6" }, 951 { 0x59, "PPP Muxing" }, 952 { 0x5b, "Vendor-Specific Network Protocol" }, 953 { 0x61, "RTP IPHC Full Header" }, 954 { 0x63, "RTP IPHC Compressed TCP" }, 955 { 0x65, "RTP IPHC Compressed non-TCP" }, 956 { 0x67, "RTP IPHC Compressed UDP 8" }, 957 { 0x69, "RTP IPHC Compressed RTP 8" }, 958 { 0x6f, "Stampede Bridging" }, 959 { 0x73, "MP+" }, 960 { 0xc1, "NTCITS IPI" }, 961 { 0xfb, "single-link compression" }, 962 { 0xfd, "Compressed Datagram" }, 963 { 0x0201, "802.1d Hello Packets" }, 964 { 0x0203, "IBM Source Routing BPDU" }, 965 { 0x0205, "DEC LANBridge100 Spanning Tree" }, 966 { 0x0207, "Cisco Discovery Protocol" }, 967 { 0x0209, "Netcs Twin Routing" }, 968 { 0x020b, "STP - Scheduled Transfer Protocol" }, 969 { 0x020d, "EDP - Extreme Discovery Protocol" }, 970 { 0x0211, "Optical Supervisory Channel Protocol" }, 971 { 0x0213, "Optical Supervisory Channel Protocol" }, 972 { 0x0231, "Luxcom" }, 973 { 0x0233, "Sigma Network Systems" }, 974 { 0x0235, "Apple Client Server Protocol" }, 975 { 0x0281, "MPLS Unicast" }, 976 { 0x0283, "MPLS Multicast" }, 977 { 0x0285, "IEEE p1284.4 standard - data packets" }, 978 { 0x0287, "ETSI TETRA Network Protocol Type 1" }, 979 { 0x0289, "Multichannel Flow Treatment Protocol" }, 980 { 0x2063, "RTP IPHC Compressed TCP No Delta" }, 981 { 0x2065, "RTP IPHC Context State" }, 982 { 0x2067, "RTP IPHC Compressed UDP 16" }, 983 { 0x2069, "RTP IPHC Compressed RTP 16" }, 984 { 0x4001, "Cray Communications Control Protocol" }, 985 { 0x4003, "CDPD Mobile Network Registration Protocol" }, 986 { 0x4005, "Expand accelerator protocol" }, 987 { 0x4007, "ODSICP NCP" }, 988 { 0x4009, "DOCSIS DLL" }, 989 { 0x400B, "Cetacean Network Detection Protocol" }, 990 { 0x4021, "Stacker LZS" }, 991 { 0x4023, "RefTek Protocol" }, 992 { 0x4025, "Fibre Channel" }, 993 { 0x4027, "EMIT Protocols" }, 994 { 0x405b, "Vendor-Specific Protocol (VSP)" }, 995 { 0x8021, "Internet Protocol Control Protocol" }, 996 { 0x8023, "OSI Network Layer Control Protocol" }, 997 { 0x8025, "Xerox NS IDP Control Protocol" }, 998 { 0x8027, "DECnet Phase IV Control Protocol" }, 999 { 0x8029, "Appletalk Control Protocol" }, 1000 { 0x802b, "Novell IPX Control Protocol" }, 1001 { 0x8031, "Bridging NCP" }, 1002 { 0x8033, "Stream Protocol Control Protocol" }, 1003 { 0x8035, "Banyan Vines Control Protocol" }, 1004 { 0x803d, "Multi-Link Control Protocol" }, 1005 { 0x803f, "NETBIOS Framing Control Protocol" }, 1006 { 0x8041, "Cisco Systems Control Protocol" }, 1007 { 0x8043, "Ascom Timeplex" }, 1008 { 0x8045, "Fujitsu LBLB Control Protocol" }, 1009 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 1010 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 1011 { 0x804b, "SNA over 802.2 Control Protocol" }, 1012 { 0x804d, "SNA Control Protocol" }, 1013 { 0x804f, "IP6 Header Compression Control Protocol" }, 1014 { 0x8051, "KNX Bridging Control Protocol" }, 1015 { 0x8053, "Encryption Control Protocol" }, 1016 { 0x8055, "Individual Link Encryption Control Protocol" }, 1017 { 0x8057, "IPv6 Control Protocol" }, 1018 { 0x8059, "PPP Muxing Control Protocol" }, 1019 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" }, 1020 { 0x806f, "Stampede Bridging Control Protocol" }, 1021 { 0x8073, "MP+ Control Protocol" }, 1022 { 0x80c1, "NTCITS IPI Control Protocol" }, 1023 { 0x80fb, "Single Link Compression Control Protocol" }, 1024 { 0x80fd, "Compression Control Protocol" }, 1025 { 0x8207, "Cisco Discovery Protocol Control" }, 1026 { 0x8209, "Netcs Twin Routing" }, 1027 { 0x820b, "STP - Control Protocol" }, 1028 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" }, 1029 { 0x8235, "Apple Client Server Protocol Control" }, 1030 { 0x8281, "MPLSCP" }, 1031 { 0x8285, "IEEE p1284.4 standard - Protocol Control" }, 1032 { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, 1033 { 0x8289, "Multichannel Flow Treatment Protocol" }, 1034 { 0xc021, "Link Control Protocol" }, 1035 { 0xc023, "Password Authentication Protocol" }, 1036 { 0xc025, "Link Quality Report" }, 1037 { 0xc027, "Shiva Password Authentication Protocol" }, 1038 { 0xc029, "CallBack Control Protocol (CBCP)" }, 1039 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" }, 1040 { 0xc02d, "BAP" }, 1041 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" }, 1042 { 0xc081, "Container Control Protocol" }, 1043 { 0xc223, "Challenge Handshake Authentication Protocol" }, 1044 { 0xc225, "RSA Authentication Protocol" }, 1045 { 0xc227, "Extensible Authentication Protocol" }, 1046 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" }, 1047 { 0xc26f, "Stampede Bridging Authorization Protocol" }, 1048 { 0xc281, "Proprietary Authentication Protocol" }, 1049 { 0xc283, "Proprietary Authentication Protocol" }, 1050 { 0xc481, "Proprietary Node ID Authentication Protocol" }, 1051 { 0, NULL }, 1052 }; 1053 1054 /* 1055 * protocol_name - find a name for a PPP protocol. 1056 */ 1057 const char * 1058 protocol_name(proto) 1059 int proto; 1060 { 1061 struct protocol_list *lp; 1062 1063 for (lp = protocol_list; lp->proto != 0; ++lp) 1064 if (proto == lp->proto) 1065 return lp->name; 1066 return NULL; 1067 } 1068 1069 /* 1070 * get_input - called when incoming data is available. 1071 */ 1072 static void 1073 get_input() 1074 { 1075 int len, i; 1076 u_char *p; 1077 u_short protocol; 1078 struct protent *protp; 1079 1080 p = inpacket_buf; /* point to beginning of packet buffer */ 1081 1082 len = read_packet(inpacket_buf); 1083 if (len < 0) 1084 return; 1085 1086 if (len == 0) { 1087 if (bundle_eof && multilink_master) { 1088 notice("Last channel has disconnected"); 1089 mp_bundle_terminated(); 1090 return; 1091 } 1092 notice("Modem hangup"); 1093 hungup = 1; 1094 status = EXIT_HANGUP; 1095 lcp_lowerdown(0); /* serial link is no longer available */ 1096 link_terminated(0); 1097 return; 1098 } 1099 1100 if (len < PPP_HDRLEN) { 1101 dbglog("received short packet:%.*B", len, p); 1102 return; 1103 } 1104 1105 dump_packet("rcvd", p, len); 1106 if (snoop_recv_hook) snoop_recv_hook(p, len); 1107 1108 p += 2; /* Skip address and control */ 1109 GETSHORT(protocol, p); 1110 len -= PPP_HDRLEN; 1111 1112 /* 1113 * Toss all non-LCP packets unless LCP is OPEN. 1114 */ 1115 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { 1116 dbglog("Discarded non-LCP packet when LCP not open"); 1117 return; 1118 } 1119 1120 /* 1121 * Until we get past the authentication phase, toss all packets 1122 * except LCP, LQR and authentication packets. 1123 */ 1124 if (phase <= PHASE_AUTHENTICATE 1125 && !(protocol == PPP_LCP || protocol == PPP_LQR 1126 || protocol == PPP_PAP || protocol == PPP_CHAP || 1127 protocol == PPP_EAP)) { 1128 dbglog("discarding proto 0x%x in phase %d", 1129 protocol, phase); 1130 return; 1131 } 1132 1133 /* 1134 * Upcall the proper protocol input routine. 1135 */ 1136 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 1137 if (protp->protocol == protocol && protp->enabled_flag) { 1138 (*protp->input)(0, p, len); 1139 return; 1140 } 1141 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag 1142 && protp->datainput != NULL) { 1143 (*protp->datainput)(0, p, len); 1144 return; 1145 } 1146 } 1147 1148 if (debug) { 1149 const char *pname = protocol_name(protocol); 1150 if (pname != NULL) 1151 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); 1152 else 1153 warn("Unsupported protocol 0x%x received", protocol); 1154 } 1155 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); 1156 } 1157 1158 /* 1159 * ppp_send_config - configure the transmit-side characteristics of 1160 * the ppp interface. Returns -1, indicating an error, if the channel 1161 * send_config procedure called error() (or incremented error_count 1162 * itself), otherwise 0. 1163 */ 1164 int 1165 ppp_send_config(unit, mtu, accm, pcomp, accomp) 1166 int unit, mtu; 1167 u_int32_t accm; 1168 int pcomp, accomp; 1169 { 1170 int errs; 1171 1172 if (the_channel->send_config == NULL) 1173 return 0; 1174 errs = error_count; 1175 (*the_channel->send_config)(mtu, accm, pcomp, accomp); 1176 return (error_count != errs)? -1: 0; 1177 } 1178 1179 /* 1180 * ppp_recv_config - configure the receive-side characteristics of 1181 * the ppp interface. Returns -1, indicating an error, if the channel 1182 * recv_config procedure called error() (or incremented error_count 1183 * itself), otherwise 0. 1184 */ 1185 int 1186 ppp_recv_config(unit, mru, accm, pcomp, accomp) 1187 int unit, mru; 1188 u_int32_t accm; 1189 int pcomp, accomp; 1190 { 1191 int errs; 1192 1193 if (the_channel->recv_config == NULL) 1194 return 0; 1195 errs = error_count; 1196 (*the_channel->recv_config)(mru, accm, pcomp, accomp); 1197 return (error_count != errs)? -1: 0; 1198 } 1199 1200 /* 1201 * new_phase - signal the start of a new phase of pppd's operation. 1202 */ 1203 void 1204 new_phase(p) 1205 int p; 1206 { 1207 phase = p; 1208 if (new_phase_hook) 1209 (*new_phase_hook)(p); 1210 notify(phasechange, p); 1211 } 1212 1213 /* 1214 * die - clean up state and exit with the specified status. 1215 */ 1216 void 1217 die(status) 1218 int status; 1219 { 1220 if (!doing_multilink || multilink_master) 1221 print_link_stats(); 1222 cleanup(); 1223 notify(exitnotify, status); 1224 syslog(LOG_INFO, "Exit."); 1225 exit(status); 1226 } 1227 1228 /* 1229 * cleanup - restore anything which needs to be restored before we exit 1230 */ 1231 /* ARGSUSED */ 1232 static void 1233 cleanup() 1234 { 1235 sys_cleanup(); 1236 1237 if (fd_ppp >= 0) 1238 the_channel->disestablish_ppp(devfd); 1239 if (the_channel->cleanup) 1240 (*the_channel->cleanup)(); 1241 remove_pidfiles(); 1242 1243 #ifdef USE_TDB 1244 if (pppdb != NULL) 1245 cleanup_db(); 1246 #endif 1247 1248 } 1249 1250 void 1251 print_link_stats() 1252 { 1253 /* 1254 * Print connect time and statistics. 1255 */ 1256 if (link_stats_valid) { 1257 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ 1258 info("Connect time %d.%d minutes.", t/10, t%10); 1259 info("Sent %u bytes, received %u bytes.", 1260 link_stats.bytes_out, link_stats.bytes_in); 1261 link_stats_valid = 0; 1262 } 1263 } 1264 1265 /* 1266 * reset_link_stats - "reset" stats when link goes up. 1267 */ 1268 void 1269 reset_link_stats(u) 1270 int u; 1271 { 1272 if (!get_ppp_stats(u, &old_link_stats)) 1273 return; 1274 gettimeofday(&start_time, NULL); 1275 } 1276 1277 /* 1278 * update_link_stats - get stats at link termination. 1279 */ 1280 void 1281 update_link_stats(u) 1282 int u; 1283 { 1284 struct timeval now; 1285 char numbuf[32]; 1286 1287 if (!get_ppp_stats(u, &link_stats) 1288 || gettimeofday(&now, NULL) < 0) 1289 return; 1290 link_connect_time = now.tv_sec - start_time.tv_sec; 1291 link_stats_valid = 1; 1292 1293 link_stats.bytes_in -= old_link_stats.bytes_in; 1294 link_stats.bytes_out -= old_link_stats.bytes_out; 1295 link_stats.pkts_in -= old_link_stats.pkts_in; 1296 link_stats.pkts_out -= old_link_stats.pkts_out; 1297 1298 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time); 1299 script_setenv("CONNECT_TIME", numbuf, 0); 1300 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out); 1301 script_setenv("BYTES_SENT", numbuf, 0); 1302 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in); 1303 script_setenv("BYTES_RCVD", numbuf, 0); 1304 } 1305 1306 1307 struct callout { 1308 struct timeval c_time; /* time at which to call routine */ 1309 void *c_arg; /* argument to routine */ 1310 void (*c_func) __P((void *)); /* routine */ 1311 struct callout *c_next; 1312 }; 1313 1314 static struct callout *callout = NULL; /* Callout list */ 1315 static struct timeval timenow; /* Current time */ 1316 1317 /* 1318 * timeout - Schedule a timeout. 1319 */ 1320 void 1321 timeout(func, arg, secs, usecs) 1322 void (*func) __P((void *)); 1323 void *arg; 1324 int secs, usecs; 1325 { 1326 struct callout *newp, *p, **pp; 1327 1328 /* 1329 * Allocate timeout. 1330 */ 1331 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) 1332 fatal("Out of memory in timeout()!"); 1333 newp->c_arg = arg; 1334 newp->c_func = func; 1335 gettimeofday(&timenow, NULL); 1336 newp->c_time.tv_sec = timenow.tv_sec + secs; 1337 newp->c_time.tv_usec = timenow.tv_usec + usecs; 1338 if (newp->c_time.tv_usec >= 1000000) { 1339 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000; 1340 newp->c_time.tv_usec %= 1000000; 1341 } 1342 1343 /* 1344 * Find correct place and link it in. 1345 */ 1346 for (pp = &callout; (p = *pp); pp = &p->c_next) 1347 if (newp->c_time.tv_sec < p->c_time.tv_sec 1348 || (newp->c_time.tv_sec == p->c_time.tv_sec 1349 && newp->c_time.tv_usec < p->c_time.tv_usec)) 1350 break; 1351 newp->c_next = p; 1352 *pp = newp; 1353 } 1354 1355 1356 /* 1357 * untimeout - Unschedule a timeout. 1358 */ 1359 void 1360 untimeout(func, arg) 1361 void (*func) __P((void *)); 1362 void *arg; 1363 { 1364 struct callout **copp, *freep; 1365 1366 /* 1367 * Find first matching timeout and remove it from the list. 1368 */ 1369 for (copp = &callout; (freep = *copp); copp = &freep->c_next) 1370 if (freep->c_func == func && freep->c_arg == arg) { 1371 *copp = freep->c_next; 1372 free((char *) freep); 1373 break; 1374 } 1375 } 1376 1377 1378 /* 1379 * calltimeout - Call any timeout routines which are now due. 1380 */ 1381 static void 1382 calltimeout() 1383 { 1384 struct callout *p; 1385 1386 while (callout != NULL) { 1387 p = callout; 1388 1389 if (gettimeofday(&timenow, NULL) < 0) 1390 fatal("Failed to get time of day: %m"); 1391 if (!(p->c_time.tv_sec < timenow.tv_sec 1392 || (p->c_time.tv_sec == timenow.tv_sec 1393 && p->c_time.tv_usec <= timenow.tv_usec))) 1394 break; /* no, it's not time yet */ 1395 1396 callout = p->c_next; 1397 (*p->c_func)(p->c_arg); 1398 1399 free((char *) p); 1400 } 1401 } 1402 1403 1404 /* 1405 * timeleft - return the length of time until the next timeout is due. 1406 */ 1407 static struct timeval * 1408 timeleft(tvp) 1409 struct timeval *tvp; 1410 { 1411 if (callout == NULL) 1412 return NULL; 1413 1414 gettimeofday(&timenow, NULL); 1415 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; 1416 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; 1417 if (tvp->tv_usec < 0) { 1418 tvp->tv_usec += 1000000; 1419 tvp->tv_sec -= 1; 1420 } 1421 if (tvp->tv_sec < 0) 1422 tvp->tv_sec = tvp->tv_usec = 0; 1423 1424 return tvp; 1425 } 1426 1427 1428 /* 1429 * kill_my_pg - send a signal to our process group, and ignore it ourselves. 1430 * We assume that sig is currently blocked. 1431 */ 1432 static void 1433 kill_my_pg(sig) 1434 int sig; 1435 { 1436 struct sigaction act, oldact; 1437 struct subprocess *chp; 1438 1439 if (!detached) { 1440 /* 1441 * There might be other things in our process group that we 1442 * didn't start that would get hit if we did a kill(0), so 1443 * just send the signal individually to our children. 1444 */ 1445 for (chp = children; chp != NULL; chp = chp->next) 1446 if (chp->killable) 1447 kill(chp->pid, sig); 1448 return; 1449 } 1450 1451 /* We've done a setsid(), so we can just use a kill(0) */ 1452 sigemptyset(&act.sa_mask); /* unnecessary in fact */ 1453 act.sa_handler = SIG_IGN; 1454 act.sa_flags = 0; 1455 kill(0, sig); 1456 /* 1457 * The kill() above made the signal pending for us, as well as 1458 * the rest of our process group, but we don't want it delivered 1459 * to us. It is blocked at the moment. Setting it to be ignored 1460 * will cause the pending signal to be discarded. If we did the 1461 * kill() after setting the signal to be ignored, it is unspecified 1462 * (by POSIX) whether the signal is immediately discarded or left 1463 * pending, and in fact Linux would leave it pending, and so it 1464 * would be delivered after the current signal handler exits, 1465 * leading to an infinite loop. 1466 */ 1467 sigaction(sig, &act, &oldact); 1468 sigaction(sig, &oldact, NULL); 1469 } 1470 1471 1472 /* 1473 * hup - Catch SIGHUP signal. 1474 * 1475 * Indicates that the physical layer has been disconnected. 1476 * We don't rely on this indication; if the user has sent this 1477 * signal, we just take the link down. 1478 */ 1479 static void 1480 hup(sig) 1481 int sig; 1482 { 1483 /* can't log a message here, it can deadlock */ 1484 got_sighup = 1; 1485 if (conn_running) 1486 /* Send the signal to the [dis]connector process(es) also */ 1487 kill_my_pg(sig); 1488 notify(sigreceived, sig); 1489 if (waiting) 1490 siglongjmp(sigjmp, 1); 1491 } 1492 1493 1494 /* 1495 * term - Catch SIGTERM signal and SIGINT signal (^C/del). 1496 * 1497 * Indicates that we should initiate a graceful disconnect and exit. 1498 */ 1499 /*ARGSUSED*/ 1500 static void 1501 term(sig) 1502 int sig; 1503 { 1504 /* can't log a message here, it can deadlock */ 1505 got_sigterm = sig; 1506 if (conn_running) 1507 /* Send the signal to the [dis]connector process(es) also */ 1508 kill_my_pg(sig); 1509 notify(sigreceived, sig); 1510 if (waiting) 1511 siglongjmp(sigjmp, 1); 1512 } 1513 1514 1515 /* 1516 * chld - Catch SIGCHLD signal. 1517 * Sets a flag so we will call reap_kids in the mainline. 1518 */ 1519 static void 1520 chld(sig) 1521 int sig; 1522 { 1523 got_sigchld = 1; 1524 if (waiting) 1525 siglongjmp(sigjmp, 1); 1526 } 1527 1528 1529 /* 1530 * toggle_debug - Catch SIGUSR1 signal. 1531 * 1532 * Toggle debug flag. 1533 */ 1534 /*ARGSUSED*/ 1535 static void 1536 toggle_debug(sig) 1537 int sig; 1538 { 1539 debug = !debug; 1540 if (debug) { 1541 setlogmask(LOG_UPTO(LOG_DEBUG)); 1542 } else { 1543 setlogmask(LOG_UPTO(LOG_WARNING)); 1544 } 1545 } 1546 1547 1548 /* 1549 * open_ccp - Catch SIGUSR2 signal. 1550 * 1551 * Try to (re)negotiate compression. 1552 */ 1553 /*ARGSUSED*/ 1554 static void 1555 open_ccp(sig) 1556 int sig; 1557 { 1558 got_sigusr2 = 1; 1559 if (waiting) 1560 siglongjmp(sigjmp, 1); 1561 } 1562 1563 1564 /* 1565 * bad_signal - We've caught a fatal signal. Clean up state and exit. 1566 */ 1567 static void 1568 bad_signal(sig) 1569 int sig; 1570 { 1571 static int crashed = 0; 1572 1573 if (crashed) 1574 _exit(127); 1575 crashed = 1; 1576 error("Fatal signal %d", sig); 1577 if (conn_running) 1578 kill_my_pg(SIGTERM); 1579 notify(sigreceived, sig); 1580 die(127); 1581 } 1582 1583 /* 1584 * safe_fork - Create a child process. The child closes all the 1585 * file descriptors that we don't want to leak to a script. 1586 * The parent waits for the child to do this before returning. 1587 * This also arranges for the specified fds to be dup'd to 1588 * fds 0, 1, 2 in the child. 1589 */ 1590 pid_t 1591 safe_fork(int infd, int outfd, int errfd) 1592 { 1593 pid_t pid; 1594 int fd, pipefd[2]; 1595 char buf[1]; 1596 1597 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */ 1598 while ((fd = dup(fd_devnull)) >= 0) { 1599 if (fd > 2) { 1600 close(fd); 1601 break; 1602 } 1603 } 1604 1605 if (pipe(pipefd) == -1) 1606 pipefd[0] = pipefd[1] = -1; 1607 pid = fork(); 1608 if (pid < 0) { 1609 error("fork failed: %m"); 1610 return -1; 1611 } 1612 if (pid > 0) { 1613 /* parent */ 1614 close(pipefd[1]); 1615 /* this read() blocks until the close(pipefd[1]) below */ 1616 complete_read(pipefd[0], buf, 1); 1617 close(pipefd[0]); 1618 return pid; 1619 } 1620 1621 /* Executing in the child */ 1622 sys_close(); 1623 #ifdef USE_TDB 1624 tdb_close(pppdb); 1625 #endif 1626 1627 /* make sure infd, outfd and errfd won't get tromped on below */ 1628 if (infd == 1 || infd == 2) 1629 infd = dup(infd); 1630 if (outfd == 0 || outfd == 2) 1631 outfd = dup(outfd); 1632 if (errfd == 0 || errfd == 1) 1633 errfd = dup(errfd); 1634 1635 closelog(); 1636 1637 /* dup the in, out, err fds to 0, 1, 2 */ 1638 if (infd != 0) 1639 dup2(infd, 0); 1640 if (outfd != 1) 1641 dup2(outfd, 1); 1642 if (errfd != 2) 1643 dup2(errfd, 2); 1644 1645 if (log_to_fd > 2) 1646 close(log_to_fd); 1647 if (the_channel->close) 1648 (*the_channel->close)(); 1649 else 1650 close(devfd); /* some plugins don't have a close function */ 1651 close(fd_ppp); 1652 close(fd_devnull); 1653 if (infd != 0) 1654 close(infd); 1655 if (outfd != 1) 1656 close(outfd); 1657 if (errfd != 2) 1658 close(errfd); 1659 1660 notify(fork_notifier, 0); 1661 close(pipefd[0]); 1662 /* this close unblocks the read() call above in the parent */ 1663 close(pipefd[1]); 1664 1665 return 0; 1666 } 1667 1668 static bool 1669 add_script_env(pos, newstring) 1670 int pos; 1671 char *newstring; 1672 { 1673 if (pos + 1 >= s_env_nalloc) { 1674 int new_n = pos + 17; 1675 char **newenv = realloc(script_env, new_n * sizeof(char *)); 1676 if (newenv == NULL) { 1677 free(newstring - 1); 1678 return 0; 1679 } 1680 script_env = newenv; 1681 s_env_nalloc = new_n; 1682 } 1683 script_env[pos] = newstring; 1684 script_env[pos + 1] = NULL; 1685 return 1; 1686 } 1687 1688 static void 1689 remove_script_env(pos) 1690 int pos; 1691 { 1692 free(script_env[pos] - 1); 1693 while ((script_env[pos] = script_env[pos + 1]) != NULL) 1694 pos++; 1695 } 1696 1697 /* 1698 * update_system_environment - process the list of set/unset options 1699 * and update the system environment. 1700 */ 1701 static void 1702 update_system_environment() 1703 { 1704 struct userenv *uep; 1705 1706 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1707 if (uep->ue_isset) 1708 setenv(uep->ue_name, uep->ue_value, 1); 1709 else 1710 unsetenv(uep->ue_name); 1711 } 1712 } 1713 1714 /* 1715 * device_script - run a program to talk to the specified fds 1716 * (e.g. to run the connector or disconnector script). 1717 * stderr gets connected to the log fd or to the _PATH_CONNERRS file. 1718 */ 1719 int 1720 device_script(program, in, out, dont_wait) 1721 char *program; 1722 int in, out; 1723 int dont_wait; 1724 { 1725 int pid; 1726 int status = -1; 1727 int errfd; 1728 1729 if (log_to_fd >= 0) 1730 errfd = log_to_fd; 1731 else 1732 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); 1733 1734 ++conn_running; 1735 pid = safe_fork(in, out, errfd); 1736 1737 if (pid != 0 && log_to_fd < 0) 1738 close(errfd); 1739 1740 if (pid < 0) { 1741 --conn_running; 1742 error("Failed to create child process: %m"); 1743 return -1; 1744 } 1745 1746 if (pid != 0) { 1747 record_child(pid, program, NULL, NULL, 1); 1748 status = 0; 1749 if (!dont_wait) { 1750 while (waitpid(pid, &status, 0) < 0) { 1751 if (errno == EINTR) 1752 continue; 1753 fatal("error waiting for (dis)connection process: %m"); 1754 } 1755 forget_child(pid, status); 1756 --conn_running; 1757 } 1758 return (status == 0 ? 0 : -1); 1759 } 1760 1761 /* here we are executing in the child */ 1762 1763 setgid(getgid()); 1764 setuid(uid); 1765 if (getuid() != uid) { 1766 fprintf(stderr, "pppd: setuid failed\n"); 1767 exit(1); 1768 } 1769 update_system_environment(); 1770 #if defined(__ANDROID__) 1771 execl("/system/bin/sh", "sh", "-c", program, NULL); 1772 #else 1773 execl("/bin/sh", "sh", "-c", program, (char *)0); 1774 #endif 1775 perror("pppd: could not exec /bin/sh"); 1776 _exit(99); 1777 /* NOTREACHED */ 1778 } 1779 1780 1781 /* 1782 * update_script_environment - process the list of set/unset options 1783 * and update the script environment. Note that we intentionally do 1784 * not update the TDB. These changes are layered on top right before 1785 * exec. It is not possible to use script_setenv() or 1786 * script_unsetenv() safely after this routine is run. 1787 */ 1788 static void 1789 update_script_environment() 1790 { 1791 struct userenv *uep; 1792 1793 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1794 int i; 1795 char *p, *newstring; 1796 int nlen = strlen(uep->ue_name); 1797 1798 for (i = 0; (p = script_env[i]) != NULL; i++) { 1799 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=') 1800 break; 1801 } 1802 if (uep->ue_isset) { 1803 nlen += strlen(uep->ue_value) + 2; 1804 newstring = malloc(nlen + 1); 1805 if (newstring == NULL) 1806 continue; 1807 *newstring++ = 0; 1808 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value); 1809 if (p != NULL) 1810 script_env[i] = newstring; 1811 else 1812 add_script_env(i, newstring); 1813 } else { 1814 remove_script_env(i); 1815 } 1816 } 1817 } 1818 1819 /* 1820 * run_program - execute a program with given arguments, 1821 * but don't wait for it unless wait is non-zero. 1822 * If the program can't be executed, logs an error unless 1823 * must_exist is 0 and the program file doesn't exist. 1824 * Returns -1 if it couldn't fork, 0 if the file doesn't exist 1825 * or isn't an executable plain file, or the process ID of the child. 1826 * If done != NULL, (*done)(arg) will be called later (within 1827 * reap_kids) iff the return value is > 0. 1828 */ 1829 pid_t 1830 run_program(prog, args, must_exist, done, arg, wait) 1831 char *prog; 1832 char **args; 1833 int must_exist; 1834 void (*done) __P((void *)); 1835 void *arg; 1836 int wait; 1837 { 1838 int pid, status; 1839 struct stat sbuf; 1840 1841 #if defined(__ANDROID__) 1842 /* Originally linkname is used to create named pid files, which is 1843 * meaningless to android. Here we use it as a suffix of program names, 1844 * so different users can run their own program by specifying it. For 1845 * example, "/etc/ppp/ip-up-vpn" will be executed when IPCP is up and 1846 * linkname is "vpn". Note that "/" is not allowed for security reasons. */ 1847 char file[MAXPATHLEN]; 1848 1849 if (linkname[0] && !strchr(linkname, '/')) { 1850 snprintf(file, MAXPATHLEN, "%s-%s", prog, linkname); 1851 file[MAXPATHLEN - 1] = '\0'; 1852 prog = file; 1853 } 1854 #endif 1855 1856 /* 1857 * First check if the file exists and is executable. 1858 * We don't use access() because that would use the 1859 * real user-id, which might not be root, and the script 1860 * might be accessible only to root. 1861 */ 1862 errno = EINVAL; 1863 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) 1864 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { 1865 if (must_exist || errno != ENOENT) 1866 warn("Can't execute %s: %m", prog); 1867 return 0; 1868 } 1869 1870 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull); 1871 if (pid == -1) { 1872 error("Failed to create child process for %s: %m", prog); 1873 return -1; 1874 } 1875 if (pid != 0) { 1876 if (debug) 1877 dbglog("Script %s started (pid %d)", prog, pid); 1878 record_child(pid, prog, done, arg, 0); 1879 if (wait) { 1880 while (waitpid(pid, &status, 0) < 0) { 1881 if (errno == EINTR) 1882 continue; 1883 fatal("error waiting for script %s: %m", prog); 1884 } 1885 forget_child(pid, status); 1886 } 1887 return pid; 1888 } 1889 1890 /* Leave the current location */ 1891 (void) setsid(); /* No controlling tty. */ 1892 (void) umask (S_IRWXG|S_IRWXO); 1893 (void) chdir ("/"); /* no current directory. */ 1894 setuid(0); /* set real UID = root */ 1895 setgid(getegid()); 1896 1897 #ifdef BSD 1898 /* Force the priority back to zero if pppd is running higher. */ 1899 if (setpriority (PRIO_PROCESS, 0, 0) < 0) 1900 warn("can't reset priority to 0: %m"); 1901 #endif 1902 1903 /* run the program */ 1904 update_script_environment(); 1905 execve(prog, args, script_env); 1906 if (must_exist || errno != ENOENT) { 1907 /* have to reopen the log, there's nowhere else 1908 for the message to go. */ 1909 reopen_log(); 1910 syslog(LOG_ERR, "Can't execute %s: %m", prog); 1911 closelog(); 1912 } 1913 _exit(99); 1914 } 1915 1916 1917 /* 1918 * record_child - add a child process to the list for reap_kids 1919 * to use. 1920 */ 1921 void 1922 record_child(pid, prog, done, arg, killable) 1923 int pid; 1924 char *prog; 1925 void (*done) __P((void *)); 1926 void *arg; 1927 int killable; 1928 { 1929 struct subprocess *chp; 1930 1931 ++n_children; 1932 1933 chp = (struct subprocess *) malloc(sizeof(struct subprocess)); 1934 if (chp == NULL) { 1935 warn("losing track of %s process", prog); 1936 } else { 1937 chp->pid = pid; 1938 chp->prog = prog; 1939 chp->done = done; 1940 chp->arg = arg; 1941 chp->next = children; 1942 chp->killable = killable; 1943 children = chp; 1944 } 1945 } 1946 1947 /* 1948 * childwait_end - we got fed up waiting for the child processes to 1949 * exit, send them all a SIGTERM. 1950 */ 1951 static void 1952 childwait_end(arg) 1953 void *arg; 1954 { 1955 struct subprocess *chp; 1956 1957 for (chp = children; chp != NULL; chp = chp->next) { 1958 if (debug) 1959 dbglog("sending SIGTERM to process %d", chp->pid); 1960 kill(chp->pid, SIGTERM); 1961 } 1962 childwait_done = 1; 1963 } 1964 1965 /* 1966 * forget_child - clean up after a dead child 1967 */ 1968 static void 1969 forget_child(pid, status) 1970 int pid, status; 1971 { 1972 struct subprocess *chp, **prevp; 1973 1974 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { 1975 if (chp->pid == pid) { 1976 --n_children; 1977 *prevp = chp->next; 1978 break; 1979 } 1980 } 1981 if (WIFSIGNALED(status)) { 1982 warn("Child process %s (pid %d) terminated with signal %d", 1983 (chp? chp->prog: "??"), pid, WTERMSIG(status)); 1984 } else if (debug) 1985 dbglog("Script %s finished (pid %d), status = 0x%x", 1986 (chp? chp->prog: "??"), pid, 1987 WIFEXITED(status) ? WEXITSTATUS(status) : status); 1988 if (chp && chp->done) 1989 (*chp->done)(chp->arg); 1990 if (chp) 1991 free(chp); 1992 } 1993 1994 /* 1995 * reap_kids - get status from any dead child processes, 1996 * and log a message for abnormal terminations. 1997 */ 1998 static int 1999 reap_kids() 2000 { 2001 int pid, status; 2002 2003 if (n_children == 0) 2004 return 0; 2005 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) { 2006 forget_child(pid, status); 2007 } 2008 if (pid == -1) { 2009 if (errno == ECHILD) 2010 return -1; 2011 if (errno != EINTR) 2012 error("Error waiting for child process: %m"); 2013 } 2014 return 0; 2015 } 2016 2017 /* 2018 * add_notifier - add a new function to be called when something happens. 2019 */ 2020 void 2021 add_notifier(notif, func, arg) 2022 struct notifier **notif; 2023 notify_func func; 2024 void *arg; 2025 { 2026 struct notifier *np; 2027 2028 np = malloc(sizeof(struct notifier)); 2029 if (np == 0) 2030 novm("notifier struct"); 2031 np->next = *notif; 2032 np->func = func; 2033 np->arg = arg; 2034 *notif = np; 2035 } 2036 2037 /* 2038 * remove_notifier - remove a function from the list of things to 2039 * be called when something happens. 2040 */ 2041 void 2042 remove_notifier(notif, func, arg) 2043 struct notifier **notif; 2044 notify_func func; 2045 void *arg; 2046 { 2047 struct notifier *np; 2048 2049 for (; (np = *notif) != 0; notif = &np->next) { 2050 if (np->func == func && np->arg == arg) { 2051 *notif = np->next; 2052 free(np); 2053 break; 2054 } 2055 } 2056 } 2057 2058 /* 2059 * notify - call a set of functions registered with add_notifier. 2060 */ 2061 void 2062 notify(notif, val) 2063 struct notifier *notif; 2064 int val; 2065 { 2066 struct notifier *np; 2067 2068 while ((np = notif) != 0) { 2069 notif = np->next; 2070 (*np->func)(np->arg, val); 2071 } 2072 } 2073 2074 /* 2075 * novm - log an error message saying we ran out of memory, and die. 2076 */ 2077 void 2078 novm(msg) 2079 char *msg; 2080 { 2081 fatal("Virtual memory exhausted allocating %s\n", msg); 2082 } 2083 2084 /* 2085 * script_setenv - set an environment variable value to be used 2086 * for scripts that we run (e.g. ip-up, auth-up, etc.) 2087 */ 2088 void 2089 script_setenv(var, value, iskey) 2090 char *var, *value; 2091 int iskey; 2092 { 2093 size_t varl = strlen(var); 2094 size_t vl = varl + strlen(value) + 2; 2095 int i; 2096 char *p, *newstring; 2097 2098 newstring = (char *) malloc(vl+1); 2099 if (newstring == 0) 2100 return; 2101 *newstring++ = iskey; 2102 slprintf(newstring, vl, "%s=%s", var, value); 2103 2104 /* check if this variable is already set */ 2105 if (script_env != 0) { 2106 for (i = 0; (p = script_env[i]) != 0; ++i) { 2107 if (strncmp(p, var, varl) == 0 && p[varl] == '=') { 2108 #ifdef USE_TDB 2109 if (p[-1] && pppdb != NULL) 2110 delete_db_key(p); 2111 #endif 2112 free(p-1); 2113 script_env[i] = newstring; 2114 #ifdef USE_TDB 2115 if (pppdb != NULL) { 2116 if (iskey) 2117 add_db_key(newstring); 2118 update_db_entry(); 2119 } 2120 #endif 2121 return; 2122 } 2123 } 2124 } else { 2125 /* no space allocated for script env. ptrs. yet */ 2126 i = 0; 2127 script_env = malloc(16 * sizeof(char *)); 2128 if (script_env == 0) { 2129 free(newstring - 1); 2130 return; 2131 } 2132 s_env_nalloc = 16; 2133 } 2134 2135 if (!add_script_env(i, newstring)) 2136 return; 2137 2138 #ifdef USE_TDB 2139 if (pppdb != NULL) { 2140 if (iskey) 2141 add_db_key(newstring); 2142 update_db_entry(); 2143 } 2144 #endif 2145 } 2146 2147 /* 2148 * script_unsetenv - remove a variable from the environment 2149 * for scripts. 2150 */ 2151 void 2152 script_unsetenv(var) 2153 char *var; 2154 { 2155 int vl = strlen(var); 2156 int i; 2157 char *p; 2158 2159 if (script_env == 0) 2160 return; 2161 for (i = 0; (p = script_env[i]) != 0; ++i) { 2162 if (strncmp(p, var, vl) == 0 && p[vl] == '=') { 2163 #ifdef USE_TDB 2164 if (p[-1] && pppdb != NULL) 2165 delete_db_key(p); 2166 #endif 2167 remove_script_env(i); 2168 break; 2169 } 2170 } 2171 #ifdef USE_TDB 2172 if (pppdb != NULL) 2173 update_db_entry(); 2174 #endif 2175 } 2176 2177 /* 2178 * Any arbitrary string used as a key for locking the database. 2179 * It doesn't matter what it is as long as all pppds use the same string. 2180 */ 2181 #define PPPD_LOCK_KEY "pppd lock" 2182 2183 /* 2184 * lock_db - get an exclusive lock on the TDB database. 2185 * Used to ensure atomicity of various lookup/modify operations. 2186 */ 2187 void lock_db() 2188 { 2189 #ifdef USE_TDB 2190 TDB_DATA key; 2191 2192 key.dptr = PPPD_LOCK_KEY; 2193 key.dsize = strlen(key.dptr); 2194 tdb_chainlock(pppdb, key); 2195 #endif 2196 } 2197 2198 /* 2199 * unlock_db - remove the exclusive lock obtained by lock_db. 2200 */ 2201 void unlock_db() 2202 { 2203 #ifdef USE_TDB 2204 TDB_DATA key; 2205 2206 key.dptr = PPPD_LOCK_KEY; 2207 key.dsize = strlen(key.dptr); 2208 tdb_chainunlock(pppdb, key); 2209 #endif 2210 } 2211 2212 #ifdef USE_TDB 2213 /* 2214 * update_db_entry - update our entry in the database. 2215 */ 2216 static void 2217 update_db_entry() 2218 { 2219 TDB_DATA key, dbuf; 2220 int vlen, i; 2221 char *p, *q, *vbuf; 2222 2223 if (script_env == NULL) 2224 return; 2225 vlen = 0; 2226 for (i = 0; (p = script_env[i]) != 0; ++i) 2227 vlen += strlen(p) + 1; 2228 vbuf = malloc(vlen + 1); 2229 if (vbuf == 0) 2230 novm("database entry"); 2231 q = vbuf; 2232 for (i = 0; (p = script_env[i]) != 0; ++i) 2233 q += slprintf(q, vbuf + vlen - q, "%s;", p); 2234 2235 key.dptr = db_key; 2236 key.dsize = strlen(db_key); 2237 dbuf.dptr = vbuf; 2238 dbuf.dsize = vlen; 2239 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2240 error("tdb_store failed: %s", tdb_errorstr(pppdb)); 2241 2242 if (vbuf) 2243 free(vbuf); 2244 2245 } 2246 2247 /* 2248 * add_db_key - add a key that we can use to look up our database entry. 2249 */ 2250 static void 2251 add_db_key(str) 2252 const char *str; 2253 { 2254 TDB_DATA key, dbuf; 2255 2256 key.dptr = (char *) str; 2257 key.dsize = strlen(str); 2258 dbuf.dptr = db_key; 2259 dbuf.dsize = strlen(db_key); 2260 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2261 error("tdb_store key failed: %s", tdb_errorstr(pppdb)); 2262 } 2263 2264 /* 2265 * delete_db_key - delete a key for looking up our database entry. 2266 */ 2267 static void 2268 delete_db_key(str) 2269 const char *str; 2270 { 2271 TDB_DATA key; 2272 2273 key.dptr = (char *) str; 2274 key.dsize = strlen(str); 2275 tdb_delete(pppdb, key); 2276 } 2277 2278 /* 2279 * cleanup_db - delete all the entries we put in the database. 2280 */ 2281 static void 2282 cleanup_db() 2283 { 2284 TDB_DATA key; 2285 int i; 2286 char *p; 2287 2288 key.dptr = db_key; 2289 key.dsize = strlen(db_key); 2290 tdb_delete(pppdb, key); 2291 for (i = 0; (p = script_env[i]) != 0; ++i) 2292 if (p[-1]) 2293 delete_db_key(p); 2294 } 2295 #endif /* USE_TDB */ 2296
