1 /* NetBSD: main.c,v 1.2 2013/11/28 22:33:42 christos Exp */ 2 3 /* 4 * main.c - Point-to-Point Protocol main module 5 * 6 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The name "Carnegie Mellon University" must not be used to 21 * endorse or promote products derived from this software without 22 * prior written permission. For permission or any legal 23 * details, please contact 24 * Office of Technology Transfer 25 * Carnegie Mellon University 26 * 5000 Forbes Avenue 27 * Pittsburgh, PA 15213-3890 28 * (412) 268-4387, fax: (412) 268-7395 29 * tech-transfer@andrew.cmu.edu 30 * 31 * 4. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by Computing Services 34 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 35 * 36 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 37 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 38 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 39 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 40 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 41 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 42 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 43 * 44 * Copyright (c) 1999-2004 Paul Mackerras. All rights reserved. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 53 * 2. The name(s) of the authors of this software must not be used to 54 * endorse or promote products derived from this software without 55 * prior written permission. 56 * 57 * 3. Redistributions of any form whatsoever must retain the following 58 * acknowledgment: 59 * "This product includes software developed by Paul Mackerras 60 * <paulus@samba.org>". 61 * 62 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 63 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 64 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 65 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 67 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 68 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71 #include <sys/cdefs.h> 72 #if 0 73 #define RCSID "Id: main.c,v 1.156 2008/06/23 11:47:18 paulus Exp " 74 static const char rcsid[] = RCSID; 75 #else 76 __RCSID("NetBSD: main.c,v 1.2 2013/11/28 22:33:42 christos Exp "); 77 #endif 78 79 #include <stdio.h> 80 #include <ctype.h> 81 #include <stdlib.h> 82 #include <string.h> 83 #include <unistd.h> 84 #include <signal.h> 85 #include <errno.h> 86 #include <fcntl.h> 87 #include <syslog.h> 88 #include <netdb.h> 89 #include <utmp.h> 90 #include <pwd.h> 91 #include <setjmp.h> 92 #include <sys/param.h> 93 #include <sys/types.h> 94 #include <sys/wait.h> 95 #include <sys/time.h> 96 #include <sys/resource.h> 97 #include <sys/stat.h> 98 #include <sys/socket.h> 99 #include <netinet/in.h> 100 #include <arpa/inet.h> 101 102 #include "pppd.h" 103 #include "magic.h" 104 #include "fsm.h" 105 #include "lcp.h" 106 #include "ipcp.h" 107 #ifdef INET6 108 #include "ipv6cp.h" 109 #endif 110 #include "upap.h" 111 #include "chap-new.h" 112 #include "eap.h" 113 #include "ccp.h" 114 #include "ecp.h" 115 #include "pathnames.h" 116 117 #ifdef USE_TDB 118 #include "tdb.h" 119 #endif 120 121 #ifdef CBCP_SUPPORT 122 #include "cbcp.h" 123 #endif 124 125 #ifdef IPX_CHANGE 126 #include "ipxcp.h" 127 #endif /* IPX_CHANGE */ 128 #ifdef AT_CHANGE 129 #include "atcp.h" 130 #endif 131 132 133 /* interface vars */ 134 char ifname[32]; /* Interface name */ 135 int ifunit; /* Interface unit number */ 136 137 struct channel *the_channel; 138 139 char *progname; /* Name of this program */ 140 char hostname[MAXNAMELEN]; /* Our hostname */ 141 static char pidfilename[MAXPATHLEN]; /* name of pid file */ 142 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ 143 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ 144 uid_t uid; /* Our real user-id */ 145 struct notifier *pidchange = NULL; 146 struct notifier *phasechange = NULL; 147 struct notifier *exitnotify = NULL; 148 struct notifier *sigreceived = NULL; 149 struct notifier *fork_notifier = NULL; 150 151 int hungup; /* terminal has been hung up */ 152 int privileged; /* we're running as real uid root */ 153 int need_holdoff; /* need holdoff period before restarting */ 154 int detached; /* have detached from terminal */ 155 volatile int status; /* exit status for pppd */ 156 int unsuccess; /* # unsuccessful connection attempts */ 157 int do_callback; /* != 0 if we should do callback next */ 158 int doing_callback; /* != 0 if we are doing callback */ 159 int ppp_session_number; /* Session number, for channels with such a 160 concept (eg PPPoE) */ 161 int childwait_done; /* have timed out waiting for children */ 162 163 #ifdef USE_TDB 164 TDB_CONTEXT *pppdb; /* database for storing status etc. */ 165 #endif 166 167 char db_key[32]; 168 169 int (*holdoff_hook) __P((void)) = NULL; 170 int (*new_phase_hook) __P((int)) = NULL; 171 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL; 172 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL; 173 174 static int conn_running; /* we have a [dis]connector running */ 175 static int fd_loop; /* fd for getting demand-dial packets */ 176 177 int fd_devnull; /* fd for /dev/null */ 178 int devfd = -1; /* fd of underlying device */ 179 int fd_ppp = -1; /* fd for talking PPP */ 180 int phase; /* where the link is at */ 181 int kill_link; 182 int asked_to_quit; 183 int open_ccp_flag; 184 int listen_time; 185 int got_sigusr2; 186 int got_sigterm; 187 int got_sighup; 188 189 static sigset_t signals_handled; 190 static int waiting; 191 static sigjmp_buf sigjmp; 192 193 char **script_env; /* Env. variable values for scripts */ 194 int s_env_nalloc; /* # words avail at script_env */ 195 196 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ 197 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ 198 199 static int n_children; /* # child processes still running */ 200 static int got_sigchld; /* set if we have received a SIGCHLD */ 201 202 int privopen; /* don't lock, open device as root */ 203 204 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; 205 206 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ 207 int ngroups; /* How many groups valid in groups */ 208 209 static struct timeval start_time; /* Time when link was started. */ 210 211 static struct pppd_stats old_link_stats; 212 struct pppd_stats link_stats; 213 unsigned link_connect_time; 214 int link_stats_valid; 215 216 int error_count; 217 218 bool bundle_eof; 219 bool bundle_terminating; 220 221 /* 222 * We maintain a list of child process pids and 223 * functions to call when they exit. 224 */ 225 struct subprocess { 226 pid_t pid; 227 char *prog; 228 void (*done) __P((void *)); 229 void *arg; 230 int killable; 231 struct subprocess *next; 232 }; 233 234 static struct subprocess *children; 235 236 /* Prototypes for procedures local to this file. */ 237 238 static void setup_signals __P((void)); 239 static void create_pidfile __P((int pid)); 240 static void create_linkpidfile __P((int pid)); 241 static void cleanup __P((void)); 242 static void get_input __P((void)); 243 static void calltimeout __P((void)); 244 static struct timeval *timeleft __P((struct timeval *)); 245 static void kill_my_pg __P((int)); 246 static void hup __P((int)); 247 static void term __P((int)); 248 static void chld __P((int)); 249 static void toggle_debug __P((int)); 250 static void open_ccp __P((int)); 251 static void bad_signal __P((int)); 252 static void holdoff_end __P((void *)); 253 static void forget_child __P((int pid, int status)); 254 static int reap_kids __P((void)); 255 static void childwait_end __P((void *)); 256 257 #ifdef USE_TDB 258 static void update_db_entry __P((void)); 259 static void add_db_key __P((const char *)); 260 static void delete_db_key __P((const char *)); 261 static void cleanup_db __P((void)); 262 #endif 263 264 static void handle_events __P((void)); 265 void print_link_stats __P((void)); 266 267 extern char *ttyname __P((int)); 268 extern char *getlogin __P((void)); 269 int main __P((int, char *[])); 270 271 #ifdef ultrix 272 #undef O_NONBLOCK 273 #define O_NONBLOCK O_NDELAY 274 #endif 275 276 #ifdef ULTRIX 277 #define setlogmask(x) 278 #endif 279 280 /* 281 * PPP Data Link Layer "protocol" table. 282 * One entry per supported protocol. 283 * The last entry must be NULL. 284 */ 285 struct protent *protocols[] = { 286 &lcp_protent, 287 &pap_protent, 288 &chap_protent, 289 #ifdef CBCP_SUPPORT 290 &cbcp_protent, 291 #endif 292 &ipcp_protent, 293 #ifdef INET6 294 &ipv6cp_protent, 295 #endif 296 &ccp_protent, 297 &ecp_protent, 298 #ifdef IPX_CHANGE 299 &ipxcp_protent, 300 #endif 301 #ifdef AT_CHANGE 302 &atcp_protent, 303 #endif 304 &eap_protent, 305 NULL 306 }; 307 308 /* 309 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. 310 */ 311 #if !defined(PPP_DRV_NAME) 312 #define PPP_DRV_NAME "ppp" 313 #endif /* !defined(PPP_DRV_NAME) */ 314 315 int 316 main(argc, argv) 317 int argc; 318 char *argv[]; 319 { 320 int i, t; 321 char *p; 322 struct passwd *pw; 323 struct protent *protp; 324 char numbuf[16]; 325 326 link_stats_valid = 0; 327 new_phase(PHASE_INITIALIZE); 328 329 script_env = NULL; 330 331 /* Initialize syslog facilities */ 332 reopen_log(); 333 334 if (gethostname(hostname, MAXNAMELEN) < 0 ) { 335 option_error("Couldn't get hostname: %m"); 336 exit(1); 337 } 338 hostname[MAXNAMELEN-1] = 0; 339 340 /* make sure we don't create world or group writable files. */ 341 umask(umask(0777) | 022); 342 343 uid = getuid(); 344 privileged = uid == 0; 345 slprintf(numbuf, sizeof(numbuf), "%d", uid); 346 script_setenv("ORIG_UID", numbuf, 0); 347 348 ngroups = getgroups(NGROUPS_MAX, groups); 349 350 /* 351 * Initialize magic number generator now so that protocols may 352 * use magic numbers in initialization. 353 */ 354 magic_init(); 355 356 /* 357 * Initialize each protocol. 358 */ 359 for (i = 0; (protp = protocols[i]) != NULL; ++i) 360 (*protp->init)(0); 361 362 /* 363 * Initialize the default channel. 364 */ 365 tty_init(); 366 367 progname = *argv; 368 369 /* 370 * Parse, in order, the system options file, the user's options file, 371 * and the command line arguments. 372 */ 373 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) 374 || !options_from_user() 375 || !parse_args(argc-1, argv+1)) 376 exit(EXIT_OPTION_ERROR); 377 devnam_fixed = 1; /* can no longer change device name */ 378 379 /* 380 * Work out the device name, if it hasn't already been specified, 381 * and parse the tty's options file. 382 */ 383 if (the_channel->process_extra_options) 384 (*the_channel->process_extra_options)(); 385 386 if (debug) 387 setlogmask(LOG_UPTO(LOG_DEBUG)); 388 389 /* 390 * Check that we are running as root. 391 */ 392 if (geteuid() != 0) { 393 option_error("must be root to run %s, since it is not setuid-root", 394 argv[0]); 395 exit(EXIT_NOT_ROOT); 396 } 397 398 if (!ppp_available()) { 399 option_error("%s", no_ppp_msg); 400 exit(EXIT_NO_KERNEL_SUPPORT); 401 } 402 403 /* 404 * Check that the options given are valid and consistent. 405 */ 406 check_options(); 407 if (!sys_check_options()) 408 exit(EXIT_OPTION_ERROR); 409 auth_check_options(); 410 #ifdef HAVE_MULTILINK 411 mp_check_options(); 412 #endif 413 for (i = 0; (protp = protocols[i]) != NULL; ++i) 414 if (protp->check_options != NULL) 415 (*protp->check_options)(); 416 if (the_channel->check_options) 417 (*the_channel->check_options)(); 418 419 420 if (dump_options || dryrun) { 421 init_pr_log(NULL, LOG_INFO); 422 print_options(pr_log, NULL); 423 end_pr_log(); 424 } 425 426 if (dryrun) 427 die(0); 428 429 /* Make sure fds 0, 1, 2 are open to somewhere. */ 430 fd_devnull = open(_PATH_DEVNULL, O_RDWR); 431 if (fd_devnull < 0) 432 fatal("Couldn't open %s: %m", _PATH_DEVNULL); 433 while (fd_devnull <= 2) { 434 i = dup(fd_devnull); 435 if (i < 0) 436 fatal("Critical shortage of file descriptors: dup failed: %m"); 437 fd_devnull = i; 438 } 439 440 /* 441 * Initialize system-dependent stuff. 442 */ 443 sys_init(); 444 445 #ifdef USE_TDB 446 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); 447 if (pppdb != NULL) { 448 slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); 449 update_db_entry(); 450 } else { 451 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); 452 if (multilink) { 453 warn("Warning: disabling multilink"); 454 multilink = 0; 455 } 456 } 457 #endif 458 459 /* 460 * Detach ourselves from the terminal, if required, 461 * and identify who is running us. 462 */ 463 if (!nodetach && !updetach) 464 detach(); 465 p = getlogin(); 466 if (p == NULL) { 467 pw = getpwuid(uid); 468 if (pw != NULL && pw->pw_name != NULL) 469 p = pw->pw_name; 470 else 471 p = "(unknown)"; 472 } 473 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid); 474 script_setenv("PPPLOGNAME", p, 0); 475 476 if (devnam[0]) 477 script_setenv("DEVICE", devnam, 1); 478 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 479 script_setenv("PPPD_PID", numbuf, 1); 480 481 setup_signals(); 482 483 create_linkpidfile(getpid()); 484 485 waiting = 0; 486 487 /* 488 * If we're doing dial-on-demand, set up the interface now. 489 */ 490 if (demand) { 491 /* 492 * Open the loopback channel and set it up to be the ppp interface. 493 */ 494 fd_loop = open_ppp_loopback(); 495 set_ifunit(1); 496 /* 497 * Configure the interface and mark it up, etc. 498 */ 499 demand_conf(); 500 } 501 502 do_callback = 0; 503 for (;;) { 504 505 bundle_eof = 0; 506 bundle_terminating = 0; 507 listen_time = 0; 508 need_holdoff = 1; 509 devfd = -1; 510 status = EXIT_OK; 511 ++unsuccess; 512 doing_callback = do_callback; 513 do_callback = 0; 514 515 if (demand && !doing_callback) { 516 /* 517 * Don't do anything until we see some activity. 518 */ 519 new_phase(PHASE_DORMANT); 520 demand_unblock(); 521 add_fd(fd_loop); 522 for (;;) { 523 handle_events(); 524 if (asked_to_quit) 525 break; 526 if (get_loop_output()) 527 break; 528 } 529 remove_fd(fd_loop); 530 if (asked_to_quit) 531 break; 532 533 /* 534 * Now we want to bring up the link. 535 */ 536 demand_block(); 537 info("Starting link"); 538 } 539 540 gettimeofday(&start_time, NULL); 541 script_unsetenv("CONNECT_TIME"); 542 script_unsetenv("BYTES_SENT"); 543 script_unsetenv("BYTES_RCVD"); 544 545 lcp_open(0); /* Start protocol */ 546 start_link(0); 547 while (phase != PHASE_DEAD) { 548 handle_events(); 549 get_input(); 550 if (kill_link) 551 lcp_close(0, "User request"); 552 if (asked_to_quit) { 553 bundle_terminating = 1; 554 if (phase == PHASE_MASTER) 555 mp_bundle_terminated(); 556 } 557 if (open_ccp_flag) { 558 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { 559 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ 560 (*ccp_protent.open)(0); 561 } 562 } 563 } 564 /* restore FSMs to original state */ 565 lcp_close(0, ""); 566 567 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail)) 568 break; 569 570 if (demand) 571 demand_discard(); 572 t = need_holdoff? holdoff: 0; 573 if (holdoff_hook) 574 t = (*holdoff_hook)(); 575 if (t > 0) { 576 new_phase(PHASE_HOLDOFF); 577 TIMEOUT(holdoff_end, NULL, t); 578 do { 579 handle_events(); 580 if (kill_link) 581 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ 582 } while (phase == PHASE_HOLDOFF); 583 if (!persist) 584 break; 585 } 586 } 587 588 /* Wait for scripts to finish */ 589 reap_kids(); 590 if (n_children > 0) { 591 if (child_wait > 0) 592 TIMEOUT(childwait_end, NULL, child_wait); 593 if (debug) { 594 struct subprocess *chp; 595 dbglog("Waiting for %d child processes...", n_children); 596 for (chp = children; chp != NULL; chp = chp->next) 597 dbglog(" script %s, pid %d", chp->prog, chp->pid); 598 } 599 while (n_children > 0 && !childwait_done) { 600 handle_events(); 601 if (kill_link && !childwait_done) 602 childwait_end(NULL); 603 } 604 } 605 606 die(status); 607 return 0; 608 } 609 610 /* 611 * handle_events - wait for something to happen and respond to it. 612 */ 613 static void 614 handle_events() 615 { 616 struct timeval timo; 617 618 kill_link = open_ccp_flag = 0; 619 if (sigsetjmp(sigjmp, 1) == 0) { 620 sigprocmask(SIG_BLOCK, &signals_handled, NULL); 621 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { 622 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 623 } else { 624 waiting = 1; 625 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); 626 wait_input(timeleft(&timo)); 627 } 628 } 629 waiting = 0; 630 calltimeout(); 631 if (got_sighup) { 632 info("Hangup (SIGHUP)"); 633 kill_link = 1; 634 got_sighup = 0; 635 if (status != EXIT_HANGUP) 636 status = EXIT_USER_REQUEST; 637 } 638 if (got_sigterm) { 639 info("Terminating on signal %d", got_sigterm); 640 kill_link = 1; 641 asked_to_quit = 1; 642 persist = 0; 643 status = EXIT_USER_REQUEST; 644 got_sigterm = 0; 645 } 646 if (got_sigchld) { 647 got_sigchld = 0; 648 reap_kids(); /* Don't leave dead kids lying around */ 649 } 650 if (got_sigusr2) { 651 open_ccp_flag = 1; 652 got_sigusr2 = 0; 653 } 654 } 655 656 /* 657 * setup_signals - initialize signal handling. 658 */ 659 static void 660 setup_signals() 661 { 662 struct sigaction sa; 663 664 /* 665 * Compute mask of all interesting signals and install signal handlers 666 * for each. Only one signal handler may be active at a time. Therefore, 667 * all other signals should be masked when any handler is executing. 668 */ 669 sigemptyset(&signals_handled); 670 sigaddset(&signals_handled, SIGHUP); 671 sigaddset(&signals_handled, SIGINT); 672 sigaddset(&signals_handled, SIGTERM); 673 sigaddset(&signals_handled, SIGCHLD); 674 sigaddset(&signals_handled, SIGUSR2); 675 676 #define SIGNAL(s, handler) do { \ 677 sa.sa_handler = handler; \ 678 if (sigaction(s, &sa, NULL) < 0) \ 679 fatal("Couldn't establish signal handler (%d): %m", s); \ 680 } while (0) 681 682 sa.sa_mask = signals_handled; 683 sa.sa_flags = 0; 684 SIGNAL(SIGHUP, hup); /* Hangup */ 685 SIGNAL(SIGINT, term); /* Interrupt */ 686 SIGNAL(SIGTERM, term); /* Terminate */ 687 SIGNAL(SIGCHLD, chld); 688 689 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ 690 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ 691 692 /* 693 * Install a handler for other signals which would otherwise 694 * cause pppd to exit without cleaning up. 695 */ 696 SIGNAL(SIGABRT, bad_signal); 697 SIGNAL(SIGALRM, bad_signal); 698 SIGNAL(SIGFPE, bad_signal); 699 SIGNAL(SIGILL, bad_signal); 700 SIGNAL(SIGPIPE, bad_signal); 701 SIGNAL(SIGQUIT, bad_signal); 702 SIGNAL(SIGSEGV, bad_signal); 703 #ifdef SIGBUS 704 SIGNAL(SIGBUS, bad_signal); 705 #endif 706 #ifdef SIGEMT 707 SIGNAL(SIGEMT, bad_signal); 708 #endif 709 #ifdef SIGPOLL 710 SIGNAL(SIGPOLL, bad_signal); 711 #endif 712 #ifdef SIGPROF 713 SIGNAL(SIGPROF, bad_signal); 714 #endif 715 #ifdef SIGSYS 716 SIGNAL(SIGSYS, bad_signal); 717 #endif 718 #ifdef SIGTRAP 719 SIGNAL(SIGTRAP, bad_signal); 720 #endif 721 #ifdef SIGVTALRM 722 SIGNAL(SIGVTALRM, bad_signal); 723 #endif 724 #ifdef SIGXCPU 725 SIGNAL(SIGXCPU, bad_signal); 726 #endif 727 #ifdef SIGXFSZ 728 SIGNAL(SIGXFSZ, bad_signal); 729 #endif 730 731 /* 732 * Apparently we can get a SIGPIPE when we call syslog, if 733 * syslogd has died and been restarted. Ignoring it seems 734 * be sufficient. 735 */ 736 signal(SIGPIPE, SIG_IGN); 737 } 738 739 /* 740 * set_ifunit - do things we need to do once we know which ppp 741 * unit we are using. 742 */ 743 void 744 set_ifunit(iskey) 745 int iskey; 746 { 747 info("Using interface %s%d", PPP_DRV_NAME, ifunit); 748 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit); 749 script_setenv("IFNAME", ifname, iskey); 750 if (iskey) { 751 create_pidfile(getpid()); /* write pid to file */ 752 create_linkpidfile(getpid()); 753 } 754 } 755 756 /* 757 * detach - detach us from the controlling terminal. 758 */ 759 void 760 detach() 761 { 762 int pid; 763 char numbuf[16]; 764 int pipefd[2]; 765 766 if (detached) 767 return; 768 if (pipe(pipefd) == -1) 769 pipefd[0] = pipefd[1] = -1; 770 if ((pid = fork()) < 0) { 771 error("Couldn't detach (fork failed: %m)"); 772 die(1); /* or just return? */ 773 } 774 if (pid != 0) { 775 /* parent */ 776 notify(pidchange, pid); 777 /* update pid files if they have been written already */ 778 if (pidfilename[0]) 779 create_pidfile(pid); 780 if (linkpidfile[0]) 781 create_linkpidfile(pid); 782 exit(0); /* parent dies */ 783 } 784 setsid(); 785 chdir("/"); 786 dup2(fd_devnull, 0); 787 dup2(fd_devnull, 1); 788 dup2(fd_devnull, 2); 789 detached = 1; 790 if (log_default) 791 log_to_fd = -1; 792 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 793 script_setenv("PPPD_PID", numbuf, 1); 794 795 /* wait for parent to finish updating pid & lock files and die */ 796 close(pipefd[1]); 797 complete_read(pipefd[0], numbuf, 1); 798 close(pipefd[0]); 799 } 800 801 /* 802 * reopen_log - (re)open our connection to syslog. 803 */ 804 void 805 reopen_log() 806 { 807 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); 808 setlogmask(LOG_UPTO(LOG_INFO)); 809 } 810 811 /* 812 * Create a file containing our process ID. 813 */ 814 static void 815 create_pidfile(pid) 816 int pid; 817 { 818 FILE *pidfile; 819 820 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", 821 _PATH_VARRUN, ifname); 822 if ((pidfile = fopen(pidfilename, "w")) != NULL) { 823 fprintf(pidfile, "%d\n", pid); 824 (void) fclose(pidfile); 825 } else { 826 error("Failed to create pid file %s: %m", pidfilename); 827 pidfilename[0] = 0; 828 } 829 } 830 831 void 832 create_linkpidfile(pid) 833 int pid; 834 { 835 FILE *pidfile; 836 837 if (linkname[0] == 0) 838 return; 839 script_setenv("LINKNAME", linkname, 1); 840 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", 841 _PATH_VARRUN, linkname); 842 if ((pidfile = fopen(linkpidfile, "w")) != NULL) { 843 fprintf(pidfile, "%d\n", pid); 844 if (ifname[0]) 845 fprintf(pidfile, "%s\n", ifname); 846 (void) fclose(pidfile); 847 } else { 848 error("Failed to create pid file %s: %m", linkpidfile); 849 linkpidfile[0] = 0; 850 } 851 } 852 853 /* 854 * remove_pidfile - remove our pid files 855 */ 856 void remove_pidfiles() 857 { 858 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) 859 warn("unable to delete pid file %s: %m", pidfilename); 860 pidfilename[0] = 0; 861 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT) 862 warn("unable to delete pid file %s: %m", linkpidfile); 863 linkpidfile[0] = 0; 864 } 865 866 /* 867 * holdoff_end - called via a timeout when the holdoff period ends. 868 */ 869 static void 870 holdoff_end(arg) 871 void *arg; 872 { 873 new_phase(PHASE_DORMANT); 874 } 875 876 /* List of protocol names, to make our messages a little more informative. */ 877 struct protocol_list { 878 u_short proto; 879 const char *name; 880 } protocol_list[] = { 881 { 0x21, "IP" }, 882 { 0x23, "OSI Network Layer" }, 883 { 0x25, "Xerox NS IDP" }, 884 { 0x27, "DECnet Phase IV" }, 885 { 0x29, "Appletalk" }, 886 { 0x2b, "Novell IPX" }, 887 { 0x2d, "VJ compressed TCP/IP" }, 888 { 0x2f, "VJ uncompressed TCP/IP" }, 889 { 0x31, "Bridging PDU" }, 890 { 0x33, "Stream Protocol ST-II" }, 891 { 0x35, "Banyan Vines" }, 892 { 0x39, "AppleTalk EDDP" }, 893 { 0x3b, "AppleTalk SmartBuffered" }, 894 { 0x3d, "Multi-Link" }, 895 { 0x3f, "NETBIOS Framing" }, 896 { 0x41, "Cisco Systems" }, 897 { 0x43, "Ascom Timeplex" }, 898 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 899 { 0x47, "DCA Remote Lan" }, 900 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, 901 { 0x4b, "SNA over 802.2" }, 902 { 0x4d, "SNA" }, 903 { 0x4f, "IP6 Header Compression" }, 904 { 0x51, "KNX Bridging Data" }, 905 { 0x53, "Encryption" }, 906 { 0x55, "Individual Link Encryption" }, 907 { 0x57, "IPv6" }, 908 { 0x59, "PPP Muxing" }, 909 { 0x5b, "Vendor-Specific Network Protocol" }, 910 { 0x61, "RTP IPHC Full Header" }, 911 { 0x63, "RTP IPHC Compressed TCP" }, 912 { 0x65, "RTP IPHC Compressed non-TCP" }, 913 { 0x67, "RTP IPHC Compressed UDP 8" }, 914 { 0x69, "RTP IPHC Compressed RTP 8" }, 915 { 0x6f, "Stampede Bridging" }, 916 { 0x73, "MP+" }, 917 { 0xc1, "NTCITS IPI" }, 918 { 0xfb, "single-link compression" }, 919 { 0xfd, "Compressed Datagram" }, 920 { 0x0201, "802.1d Hello Packets" }, 921 { 0x0203, "IBM Source Routing BPDU" }, 922 { 0x0205, "DEC LANBridge100 Spanning Tree" }, 923 { 0x0207, "Cisco Discovery Protocol" }, 924 { 0x0209, "Netcs Twin Routing" }, 925 { 0x020b, "STP - Scheduled Transfer Protocol" }, 926 { 0x020d, "EDP - Extreme Discovery Protocol" }, 927 { 0x0211, "Optical Supervisory Channel Protocol" }, 928 { 0x0213, "Optical Supervisory Channel Protocol" }, 929 { 0x0231, "Luxcom" }, 930 { 0x0233, "Sigma Network Systems" }, 931 { 0x0235, "Apple Client Server Protocol" }, 932 { 0x0281, "MPLS Unicast" }, 933 { 0x0283, "MPLS Multicast" }, 934 { 0x0285, "IEEE p1284.4 standard - data packets" }, 935 { 0x0287, "ETSI TETRA Network Protocol Type 1" }, 936 { 0x0289, "Multichannel Flow Treatment Protocol" }, 937 { 0x2063, "RTP IPHC Compressed TCP No Delta" }, 938 { 0x2065, "RTP IPHC Context State" }, 939 { 0x2067, "RTP IPHC Compressed UDP 16" }, 940 { 0x2069, "RTP IPHC Compressed RTP 16" }, 941 { 0x4001, "Cray Communications Control Protocol" }, 942 { 0x4003, "CDPD Mobile Network Registration Protocol" }, 943 { 0x4005, "Expand accelerator protocol" }, 944 { 0x4007, "ODSICP NCP" }, 945 { 0x4009, "DOCSIS DLL" }, 946 { 0x400B, "Cetacean Network Detection Protocol" }, 947 { 0x4021, "Stacker LZS" }, 948 { 0x4023, "RefTek Protocol" }, 949 { 0x4025, "Fibre Channel" }, 950 { 0x4027, "EMIT Protocols" }, 951 { 0x405b, "Vendor-Specific Protocol (VSP)" }, 952 { 0x8021, "Internet Protocol Control Protocol" }, 953 { 0x8023, "OSI Network Layer Control Protocol" }, 954 { 0x8025, "Xerox NS IDP Control Protocol" }, 955 { 0x8027, "DECnet Phase IV Control Protocol" }, 956 { 0x8029, "Appletalk Control Protocol" }, 957 { 0x802b, "Novell IPX Control Protocol" }, 958 { 0x8031, "Bridging NCP" }, 959 { 0x8033, "Stream Protocol Control Protocol" }, 960 { 0x8035, "Banyan Vines Control Protocol" }, 961 { 0x803d, "Multi-Link Control Protocol" }, 962 { 0x803f, "NETBIOS Framing Control Protocol" }, 963 { 0x8041, "Cisco Systems Control Protocol" }, 964 { 0x8043, "Ascom Timeplex" }, 965 { 0x8045, "Fujitsu LBLB Control Protocol" }, 966 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 967 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 968 { 0x804b, "SNA over 802.2 Control Protocol" }, 969 { 0x804d, "SNA Control Protocol" }, 970 { 0x804f, "IP6 Header Compression Control Protocol" }, 971 { 0x8051, "KNX Bridging Control Protocol" }, 972 { 0x8053, "Encryption Control Protocol" }, 973 { 0x8055, "Individual Link Encryption Control Protocol" }, 974 { 0x8057, "IPv6 Control Protocol" }, 975 { 0x8059, "PPP Muxing Control Protocol" }, 976 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" }, 977 { 0x806f, "Stampede Bridging Control Protocol" }, 978 { 0x8073, "MP+ Control Protocol" }, 979 { 0x80c1, "NTCITS IPI Control Protocol" }, 980 { 0x80fb, "Single Link Compression Control Protocol" }, 981 { 0x80fd, "Compression Control Protocol" }, 982 { 0x8207, "Cisco Discovery Protocol Control" }, 983 { 0x8209, "Netcs Twin Routing" }, 984 { 0x820b, "STP - Control Protocol" }, 985 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" }, 986 { 0x8235, "Apple Client Server Protocol Control" }, 987 { 0x8281, "MPLSCP" }, 988 { 0x8285, "IEEE p1284.4 standard - Protocol Control" }, 989 { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, 990 { 0x8289, "Multichannel Flow Treatment Protocol" }, 991 { 0xc021, "Link Control Protocol" }, 992 { 0xc023, "Password Authentication Protocol" }, 993 { 0xc025, "Link Quality Report" }, 994 { 0xc027, "Shiva Password Authentication Protocol" }, 995 { 0xc029, "CallBack Control Protocol (CBCP)" }, 996 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" }, 997 { 0xc02d, "BAP" }, 998 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" }, 999 { 0xc081, "Container Control Protocol" }, 1000 { 0xc223, "Challenge Handshake Authentication Protocol" }, 1001 { 0xc225, "RSA Authentication Protocol" }, 1002 { 0xc227, "Extensible Authentication Protocol" }, 1003 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" }, 1004 { 0xc26f, "Stampede Bridging Authorization Protocol" }, 1005 { 0xc281, "Proprietary Authentication Protocol" }, 1006 { 0xc283, "Proprietary Authentication Protocol" }, 1007 { 0xc481, "Proprietary Node ID Authentication Protocol" }, 1008 { 0, NULL }, 1009 }; 1010 1011 /* 1012 * protocol_name - find a name for a PPP protocol. 1013 */ 1014 const char * 1015 protocol_name(proto) 1016 int proto; 1017 { 1018 struct protocol_list *lp; 1019 1020 for (lp = protocol_list; lp->proto != 0; ++lp) 1021 if (proto == lp->proto) 1022 return lp->name; 1023 return NULL; 1024 } 1025 1026 /* 1027 * get_input - called when incoming data is available. 1028 */ 1029 static void 1030 get_input() 1031 { 1032 int len, i; 1033 u_char *p; 1034 u_short protocol; 1035 struct protent *protp; 1036 1037 p = inpacket_buf; /* point to beginning of packet buffer */ 1038 1039 len = read_packet(inpacket_buf); 1040 if (len < 0) 1041 return; 1042 1043 if (len == 0) { 1044 if (bundle_eof && multilink_master) { 1045 notice("Last channel has disconnected"); 1046 mp_bundle_terminated(); 1047 return; 1048 } 1049 notice("Modem hangup"); 1050 hungup = 1; 1051 status = EXIT_HANGUP; 1052 lcp_lowerdown(0); /* serial link is no longer available */ 1053 link_terminated(0); 1054 return; 1055 } 1056 1057 if (len < PPP_HDRLEN) { 1058 dbglog("received short packet:%.*B", len, p); 1059 return; 1060 } 1061 1062 dump_packet("rcvd", p, len); 1063 if (snoop_recv_hook) snoop_recv_hook(p, len); 1064 1065 p += 2; /* Skip address and control */ 1066 GETSHORT(protocol, p); 1067 len -= PPP_HDRLEN; 1068 1069 /* 1070 * Toss all non-LCP packets unless LCP is OPEN. 1071 */ 1072 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { 1073 dbglog("Discarded non-LCP packet when LCP not open"); 1074 return; 1075 } 1076 1077 /* 1078 * Until we get past the authentication phase, toss all packets 1079 * except LCP, LQR and authentication packets. 1080 */ 1081 if (phase <= PHASE_AUTHENTICATE 1082 && !(protocol == PPP_LCP || protocol == PPP_LQR 1083 || protocol == PPP_PAP || protocol == PPP_CHAP || 1084 protocol == PPP_EAP)) { 1085 dbglog("discarding proto 0x%x in phase %d", 1086 protocol, phase); 1087 return; 1088 } 1089 1090 /* 1091 * Upcall the proper protocol input routine. 1092 */ 1093 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 1094 if (protp->protocol == protocol && protp->enabled_flag) { 1095 (*protp->input)(0, p, len); 1096 return; 1097 } 1098 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag 1099 && protp->datainput != NULL) { 1100 (*protp->datainput)(0, p, len); 1101 return; 1102 } 1103 } 1104 1105 if (debug) { 1106 const char *pname = protocol_name(protocol); 1107 if (pname != NULL) 1108 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); 1109 else 1110 warn("Unsupported protocol 0x%x received", protocol); 1111 } 1112 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); 1113 } 1114 1115 /* 1116 * ppp_send_config - configure the transmit-side characteristics of 1117 * the ppp interface. Returns -1, indicating an error, if the channel 1118 * send_config procedure called error() (or incremented error_count 1119 * itself), otherwise 0. 1120 */ 1121 int 1122 ppp_send_config(unit, mtu, accm, pcomp, accomp) 1123 int unit, mtu; 1124 u_int32_t accm; 1125 int pcomp, accomp; 1126 { 1127 int errs; 1128 1129 if (the_channel->send_config == NULL) 1130 return 0; 1131 errs = error_count; 1132 (*the_channel->send_config)(mtu, accm, pcomp, accomp); 1133 return (error_count != errs)? -1: 0; 1134 } 1135 1136 /* 1137 * ppp_recv_config - configure the receive-side characteristics of 1138 * the ppp interface. Returns -1, indicating an error, if the channel 1139 * recv_config procedure called error() (or incremented error_count 1140 * itself), otherwise 0. 1141 */ 1142 int 1143 ppp_recv_config(unit, mru, accm, pcomp, accomp) 1144 int unit, mru; 1145 u_int32_t accm; 1146 int pcomp, accomp; 1147 { 1148 int errs; 1149 1150 if (the_channel->recv_config == NULL) 1151 return 0; 1152 errs = error_count; 1153 (*the_channel->recv_config)(mru, accm, pcomp, accomp); 1154 return (error_count != errs)? -1: 0; 1155 } 1156 1157 /* 1158 * new_phase - signal the start of a new phase of pppd's operation. 1159 */ 1160 void 1161 new_phase(p) 1162 int p; 1163 { 1164 phase = p; 1165 if (new_phase_hook) 1166 (*new_phase_hook)(p); 1167 notify(phasechange, p); 1168 } 1169 1170 /* 1171 * die - clean up state and exit with the specified status. 1172 */ 1173 void 1174 die(status) 1175 int status; 1176 { 1177 if (!doing_multilink || multilink_master) 1178 print_link_stats(); 1179 cleanup(); 1180 notify(exitnotify, status); 1181 syslog(LOG_INFO, "Exit."); 1182 exit(status); 1183 } 1184 1185 /* 1186 * cleanup - restore anything which needs to be restored before we exit 1187 */ 1188 /* ARGSUSED */ 1189 static void 1190 cleanup() 1191 { 1192 sys_cleanup(); 1193 1194 if (fd_ppp >= 0) 1195 the_channel->disestablish_ppp(devfd); 1196 if (the_channel->cleanup) 1197 (*the_channel->cleanup)(); 1198 remove_pidfiles(); 1199 1200 #ifdef USE_TDB 1201 if (pppdb != NULL) 1202 cleanup_db(); 1203 #endif 1204 1205 } 1206 1207 void 1208 print_link_stats() 1209 { 1210 /* 1211 * Print connect time and statistics. 1212 */ 1213 if (link_stats_valid) { 1214 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ 1215 info("Connect time %d.%d minutes.", t/10, t%10); 1216 info("Sent %u bytes, received %u bytes.", 1217 link_stats.bytes_out, link_stats.bytes_in); 1218 link_stats_valid = 0; 1219 } 1220 } 1221 1222 /* 1223 * reset_link_stats - "reset" stats when link goes up. 1224 */ 1225 void 1226 reset_link_stats(u) 1227 int u; 1228 { 1229 if (!get_ppp_stats(u, &old_link_stats)) 1230 return; 1231 gettimeofday(&start_time, NULL); 1232 } 1233 1234 /* 1235 * update_link_stats - get stats at link termination. 1236 */ 1237 void 1238 update_link_stats(u) 1239 int u; 1240 { 1241 struct timeval now; 1242 char numbuf[32]; 1243 1244 if (!get_ppp_stats(u, &link_stats) 1245 || gettimeofday(&now, NULL) < 0) 1246 return; 1247 link_connect_time = now.tv_sec - start_time.tv_sec; 1248 link_stats_valid = 1; 1249 1250 link_stats.bytes_in -= old_link_stats.bytes_in; 1251 link_stats.bytes_out -= old_link_stats.bytes_out; 1252 link_stats.pkts_in -= old_link_stats.pkts_in; 1253 link_stats.pkts_out -= old_link_stats.pkts_out; 1254 1255 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time); 1256 script_setenv("CONNECT_TIME", numbuf, 0); 1257 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out); 1258 script_setenv("BYTES_SENT", numbuf, 0); 1259 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in); 1260 script_setenv("BYTES_RCVD", numbuf, 0); 1261 } 1262 1263 1264 struct callout { 1265 struct timeval c_time; /* time at which to call routine */ 1266 void *c_arg; /* argument to routine */ 1267 void (*c_func) __P((void *)); /* routine */ 1268 struct callout *c_next; 1269 }; 1270 1271 static struct callout *callout = NULL; /* Callout list */ 1272 static struct timeval timenow; /* Current time */ 1273 1274 /* 1275 * timeout - Schedule a timeout. 1276 */ 1277 void 1278 timeout(func, arg, secs, usecs) 1279 void (*func) __P((void *)); 1280 void *arg; 1281 int secs, usecs; 1282 { 1283 struct callout *newp, *p, **pp; 1284 1285 /* 1286 * Allocate timeout. 1287 */ 1288 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) 1289 fatal("Out of memory in timeout()!"); 1290 newp->c_arg = arg; 1291 newp->c_func = func; 1292 gettimeofday(&timenow, NULL); 1293 newp->c_time.tv_sec = timenow.tv_sec + secs; 1294 newp->c_time.tv_usec = timenow.tv_usec + usecs; 1295 if (newp->c_time.tv_usec >= 1000000) { 1296 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000; 1297 newp->c_time.tv_usec %= 1000000; 1298 } 1299 1300 /* 1301 * Find correct place and link it in. 1302 */ 1303 for (pp = &callout; (p = *pp); pp = &p->c_next) 1304 if (newp->c_time.tv_sec < p->c_time.tv_sec 1305 || (newp->c_time.tv_sec == p->c_time.tv_sec 1306 && newp->c_time.tv_usec < p->c_time.tv_usec)) 1307 break; 1308 newp->c_next = p; 1309 *pp = newp; 1310 } 1311 1312 1313 /* 1314 * untimeout - Unschedule a timeout. 1315 */ 1316 void 1317 untimeout(func, arg) 1318 void (*func) __P((void *)); 1319 void *arg; 1320 { 1321 struct callout **copp, *freep; 1322 1323 /* 1324 * Find first matching timeout and remove it from the list. 1325 */ 1326 for (copp = &callout; (freep = *copp); copp = &freep->c_next) 1327 if (freep->c_func == func && freep->c_arg == arg) { 1328 *copp = freep->c_next; 1329 free((char *) freep); 1330 break; 1331 } 1332 } 1333 1334 1335 /* 1336 * calltimeout - Call any timeout routines which are now due. 1337 */ 1338 static void 1339 calltimeout() 1340 { 1341 struct callout *p; 1342 1343 while (callout != NULL) { 1344 p = callout; 1345 1346 if (gettimeofday(&timenow, NULL) < 0) 1347 fatal("Failed to get time of day: %m"); 1348 if (!(p->c_time.tv_sec < timenow.tv_sec 1349 || (p->c_time.tv_sec == timenow.tv_sec 1350 && p->c_time.tv_usec <= timenow.tv_usec))) 1351 break; /* no, it's not time yet */ 1352 1353 callout = p->c_next; 1354 (*p->c_func)(p->c_arg); 1355 1356 free((char *) p); 1357 } 1358 } 1359 1360 1361 /* 1362 * timeleft - return the length of time until the next timeout is due. 1363 */ 1364 static struct timeval * 1365 timeleft(tvp) 1366 struct timeval *tvp; 1367 { 1368 if (callout == NULL) 1369 return NULL; 1370 1371 gettimeofday(&timenow, NULL); 1372 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; 1373 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; 1374 if (tvp->tv_usec < 0) { 1375 tvp->tv_usec += 1000000; 1376 tvp->tv_sec -= 1; 1377 } 1378 if (tvp->tv_sec < 0) 1379 tvp->tv_sec = tvp->tv_usec = 0; 1380 1381 return tvp; 1382 } 1383 1384 1385 /* 1386 * kill_my_pg - send a signal to our process group, and ignore it ourselves. 1387 * We assume that sig is currently blocked. 1388 */ 1389 static void 1390 kill_my_pg(sig) 1391 int sig; 1392 { 1393 struct sigaction act, oldact; 1394 struct subprocess *chp; 1395 1396 if (!detached) { 1397 /* 1398 * There might be other things in our process group that we 1399 * didn't start that would get hit if we did a kill(0), so 1400 * just send the signal individually to our children. 1401 */ 1402 for (chp = children; chp != NULL; chp = chp->next) 1403 if (chp->killable) 1404 kill(chp->pid, sig); 1405 return; 1406 } 1407 1408 /* We've done a setsid(), so we can just use a kill(0) */ 1409 sigemptyset(&act.sa_mask); /* unnecessary in fact */ 1410 act.sa_handler = SIG_IGN; 1411 act.sa_flags = 0; 1412 kill(0, sig); 1413 /* 1414 * The kill() above made the signal pending for us, as well as 1415 * the rest of our process group, but we don't want it delivered 1416 * to us. It is blocked at the moment. Setting it to be ignored 1417 * will cause the pending signal to be discarded. If we did the 1418 * kill() after setting the signal to be ignored, it is unspecified 1419 * (by POSIX) whether the signal is immediately discarded or left 1420 * pending, and in fact Linux would leave it pending, and so it 1421 * would be delivered after the current signal handler exits, 1422 * leading to an infinite loop. 1423 */ 1424 sigaction(sig, &act, &oldact); 1425 sigaction(sig, &oldact, NULL); 1426 } 1427 1428 1429 /* 1430 * hup - Catch SIGHUP signal. 1431 * 1432 * Indicates that the physical layer has been disconnected. 1433 * We don't rely on this indication; if the user has sent this 1434 * signal, we just take the link down. 1435 */ 1436 static void 1437 hup(sig) 1438 int sig; 1439 { 1440 /* can't log a message here, it can deadlock */ 1441 got_sighup = 1; 1442 if (conn_running) 1443 /* Send the signal to the [dis]connector process(es) also */ 1444 kill_my_pg(sig); 1445 notify(sigreceived, sig); 1446 if (waiting) 1447 siglongjmp(sigjmp, 1); 1448 } 1449 1450 1451 /* 1452 * term - Catch SIGTERM signal and SIGINT signal (^C/del). 1453 * 1454 * Indicates that we should initiate a graceful disconnect and exit. 1455 */ 1456 /*ARGSUSED*/ 1457 static void 1458 term(sig) 1459 int sig; 1460 { 1461 /* can't log a message here, it can deadlock */ 1462 got_sigterm = sig; 1463 if (conn_running) 1464 /* Send the signal to the [dis]connector process(es) also */ 1465 kill_my_pg(sig); 1466 notify(sigreceived, sig); 1467 if (waiting) 1468 siglongjmp(sigjmp, 1); 1469 } 1470 1471 1472 /* 1473 * chld - Catch SIGCHLD signal. 1474 * Sets a flag so we will call reap_kids in the mainline. 1475 */ 1476 static void 1477 chld(sig) 1478 int sig; 1479 { 1480 got_sigchld = 1; 1481 if (waiting) 1482 siglongjmp(sigjmp, 1); 1483 } 1484 1485 1486 /* 1487 * toggle_debug - Catch SIGUSR1 signal. 1488 * 1489 * Toggle debug flag. 1490 */ 1491 /*ARGSUSED*/ 1492 static void 1493 toggle_debug(sig) 1494 int sig; 1495 { 1496 debug = !debug; 1497 if (debug) { 1498 setlogmask(LOG_UPTO(LOG_DEBUG)); 1499 } else { 1500 setlogmask(LOG_UPTO(LOG_WARNING)); 1501 } 1502 } 1503 1504 1505 /* 1506 * open_ccp - Catch SIGUSR2 signal. 1507 * 1508 * Try to (re)negotiate compression. 1509 */ 1510 /*ARGSUSED*/ 1511 static void 1512 open_ccp(sig) 1513 int sig; 1514 { 1515 got_sigusr2 = 1; 1516 if (waiting) 1517 siglongjmp(sigjmp, 1); 1518 } 1519 1520 1521 /* 1522 * bad_signal - We've caught a fatal signal. Clean up state and exit. 1523 */ 1524 static void 1525 bad_signal(sig) 1526 int sig; 1527 { 1528 static int crashed = 0; 1529 1530 if (crashed) 1531 _exit(127); 1532 crashed = 1; 1533 error("Fatal signal %d", sig); 1534 if (conn_running) 1535 kill_my_pg(SIGTERM); 1536 notify(sigreceived, sig); 1537 die(127); 1538 } 1539 1540 /* 1541 * safe_fork - Create a child process. The child closes all the 1542 * file descriptors that we don't want to leak to a script. 1543 * The parent waits for the child to do this before returning. 1544 * This also arranges for the specified fds to be dup'd to 1545 * fds 0, 1, 2 in the child. 1546 */ 1547 pid_t 1548 safe_fork(int infd, int outfd, int errfd) 1549 { 1550 pid_t pid; 1551 int fd, pipefd[2]; 1552 char buf[1]; 1553 1554 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */ 1555 while ((fd = dup(fd_devnull)) >= 0) { 1556 if (fd > 2) { 1557 close(fd); 1558 break; 1559 } 1560 } 1561 1562 if (pipe(pipefd) == -1) 1563 pipefd[0] = pipefd[1] = -1; 1564 pid = fork(); 1565 if (pid < 0) { 1566 error("fork failed: %m"); 1567 return -1; 1568 } 1569 if (pid > 0) { 1570 /* parent */ 1571 close(pipefd[1]); 1572 /* this read() blocks until the close(pipefd[1]) below */ 1573 complete_read(pipefd[0], buf, 1); 1574 close(pipefd[0]); 1575 return pid; 1576 } 1577 1578 /* Executing in the child */ 1579 sys_close(); 1580 #ifdef USE_TDB 1581 tdb_close(pppdb); 1582 #endif 1583 1584 /* make sure infd, outfd and errfd won't get tromped on below */ 1585 if (infd == 1 || infd == 2) 1586 infd = dup(infd); 1587 if (outfd == 0 || outfd == 2) 1588 outfd = dup(outfd); 1589 if (errfd == 0 || errfd == 1) 1590 errfd = dup(errfd); 1591 1592 closelog(); 1593 1594 /* dup the in, out, err fds to 0, 1, 2 */ 1595 if (infd != 0) 1596 dup2(infd, 0); 1597 if (outfd != 1) 1598 dup2(outfd, 1); 1599 if (errfd != 2) 1600 dup2(errfd, 2); 1601 1602 if (log_to_fd > 2) 1603 close(log_to_fd); 1604 if (the_channel->close) 1605 (*the_channel->close)(); 1606 else 1607 close(devfd); /* some plugins don't have a close function */ 1608 close(fd_ppp); 1609 close(fd_devnull); 1610 if (infd != 0) 1611 close(infd); 1612 if (outfd != 1) 1613 close(outfd); 1614 if (errfd != 2) 1615 close(errfd); 1616 1617 notify(fork_notifier, 0); 1618 close(pipefd[0]); 1619 /* this close unblocks the read() call above in the parent */ 1620 close(pipefd[1]); 1621 1622 return 0; 1623 } 1624 1625 static bool 1626 add_script_env(int pos, char *newstring) 1627 { 1628 if (pos + 1 >= s_env_nalloc) { 1629 int new_n = pos + 17; 1630 char **newenv = realloc(script_env, new_n * sizeof(char *)); 1631 if (newenv == NULL) { 1632 free(newstring - 1); 1633 return 0; 1634 } 1635 script_env = newenv; 1636 s_env_nalloc = new_n; 1637 } 1638 script_env[pos] = newstring; 1639 script_env[pos + 1] = NULL; 1640 return 1; 1641 } 1642 1643 static void 1644 remove_script_env(int pos) 1645 { 1646 free(script_env[pos] - 1); 1647 while ((script_env[pos] = script_env[pos + 1]) != NULL) 1648 pos++; 1649 } 1650 1651 /* 1652 * update_system_environment - process the list of set/unset options 1653 * and update the system environment. 1654 */ 1655 static void 1656 update_system_environment(void) 1657 { 1658 struct userenv *uep; 1659 1660 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1661 if (uep->ue_isset) 1662 setenv(uep->ue_name, uep->ue_value, 1); 1663 else 1664 unsetenv(uep->ue_name); 1665 } 1666 } 1667 1668 /* 1669 * device_script - run a program to talk to the specified fds 1670 * (e.g. to run the connector or disconnector script). 1671 * stderr gets connected to the log fd or to the _PATH_CONNERRS file. 1672 */ 1673 int 1674 device_script(program, in, out, dont_wait) 1675 char *program; 1676 int in, out; 1677 int dont_wait; 1678 { 1679 int pid; 1680 int status = -1; 1681 int errfd; 1682 1683 if (log_to_fd >= 0) 1684 errfd = log_to_fd; 1685 else { 1686 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); 1687 if (errfd == -1) { 1688 error("Cannot open `%s': %m", _PATH_CONNERRS); 1689 return -1; 1690 } 1691 } 1692 1693 ++conn_running; 1694 pid = safe_fork(in, out, errfd); 1695 1696 if (pid != 0 && log_to_fd < 0) 1697 close(errfd); 1698 1699 if (pid < 0) { 1700 --conn_running; 1701 error("Failed to create child process: %m"); 1702 return -1; 1703 } 1704 1705 if (pid != 0) { 1706 record_child(pid, program, NULL, NULL, 1); 1707 status = 0; 1708 if (!dont_wait) { 1709 while (waitpid(pid, &status, 0) < 0) { 1710 if (errno == EINTR) 1711 continue; 1712 fatal("error waiting for (dis)connection process: %m"); 1713 } 1714 forget_child(pid, status); 1715 --conn_running; 1716 } 1717 return (status == 0 ? 0 : -1); 1718 } 1719 1720 /* here we are executing in the child */ 1721 1722 setgid(getgid()); 1723 setuid(uid); 1724 if (getuid() != uid) { 1725 fprintf(stderr, "pppd: setuid failed\n"); 1726 exit(1); 1727 } 1728 update_system_environment(); 1729 execl("/bin/sh", "sh", "-c", program, (char *)0); 1730 perror("pppd: could not exec /bin/sh"); 1731 _exit(99); 1732 /* NOTREACHED */ 1733 } 1734 1735 1736 /* 1737 * update_script_environment - process the list of set/unset options 1738 * and update the script environment. Note that we intentionally do 1739 * not update the TDB. These changes are layered on top right before 1740 * exec. It is not possible to use script_setenv() or 1741 * script_unsetenv() safely after this routine is run. 1742 */ 1743 static void 1744 update_script_environment(void) 1745 { 1746 struct userenv *uep; 1747 1748 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) { 1749 int i; 1750 char *p, *newstring; 1751 int nlen = strlen(uep->ue_name); 1752 1753 for (i = 0; (p = script_env[i]) != NULL; i++) { 1754 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=') 1755 break; 1756 } 1757 if (uep->ue_isset) { 1758 nlen += strlen(uep->ue_value) + 2; 1759 newstring = malloc(nlen + 1); 1760 if (newstring == NULL) 1761 continue; 1762 *newstring++ = 0; 1763 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value); 1764 if (p != NULL) 1765 script_env[i] = newstring; 1766 else 1767 add_script_env(i, newstring); 1768 } else { 1769 remove_script_env(i); 1770 } 1771 } 1772 } 1773 1774 /* 1775 * run_program - execute a program with given arguments, 1776 * but don't wait for it unless wait is non-zero. 1777 * If the program can't be executed, logs an error unless 1778 * must_exist is 0 and the program file doesn't exist. 1779 * Returns -1 if it couldn't fork, 0 if the file doesn't exist 1780 * or isn't an executable plain file, or the process ID of the child. 1781 * If done != NULL, (*done)(arg) will be called later (within 1782 * reap_kids) iff the return value is > 0. 1783 */ 1784 pid_t 1785 run_program(prog, args, must_exist, done, arg, wait) 1786 char *prog; 1787 char **args; 1788 int must_exist; 1789 void (*done) __P((void *)); 1790 void *arg; 1791 int wait; 1792 { 1793 int pid, status; 1794 struct stat sbuf; 1795 1796 /* 1797 * First check if the file exists and is executable. 1798 * We don't use access() because that would use the 1799 * real user-id, which might not be root, and the script 1800 * might be accessible only to root. 1801 */ 1802 errno = EINVAL; 1803 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) 1804 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { 1805 if (must_exist || errno != ENOENT) 1806 warn("Can't execute %s: %m", prog); 1807 return 0; 1808 } 1809 1810 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull); 1811 if (pid == -1) { 1812 error("Failed to create child process for %s: %m", prog); 1813 return -1; 1814 } 1815 if (pid != 0) { 1816 if (debug) 1817 dbglog("Script %s started (pid %d)", prog, pid); 1818 record_child(pid, prog, done, arg, 0); 1819 if (wait) { 1820 while (waitpid(pid, &status, 0) < 0) { 1821 if (errno == EINTR) 1822 continue; 1823 fatal("error waiting for script %s: %m", prog); 1824 } 1825 forget_child(pid, status); 1826 } 1827 return pid; 1828 } 1829 1830 /* Leave the current location */ 1831 (void) setsid(); /* No controlling tty. */ 1832 (void) umask (S_IRWXG|S_IRWXO); 1833 (void) chdir ("/"); /* no current directory. */ 1834 setuid(0); /* set real UID = root */ 1835 setgid(getegid()); 1836 1837 #ifdef BSD 1838 /* Force the priority back to zero if pppd is running higher. */ 1839 if (setpriority (PRIO_PROCESS, 0, 0) < 0) 1840 warn("can't reset priority to 0: %m"); 1841 #endif 1842 1843 /* run the program */ 1844 update_script_environment(); 1845 execve(prog, args, script_env); 1846 if (must_exist || errno != ENOENT) { 1847 /* have to reopen the log, there's nowhere else 1848 for the message to go. */ 1849 reopen_log(); 1850 syslog(LOG_ERR, "Can't execute %s: %m", prog); 1851 closelog(); 1852 } 1853 _exit(99); 1854 } 1855 1856 1857 /* 1858 * record_child - add a child process to the list for reap_kids 1859 * to use. 1860 */ 1861 void 1862 record_child(pid, prog, done, arg, killable) 1863 int pid; 1864 char *prog; 1865 void (*done) __P((void *)); 1866 void *arg; 1867 int killable; 1868 { 1869 struct subprocess *chp; 1870 1871 ++n_children; 1872 1873 chp = (struct subprocess *) malloc(sizeof(struct subprocess)); 1874 if (chp == NULL) { 1875 warn("losing track of %s process", prog); 1876 } else { 1877 chp->pid = pid; 1878 chp->prog = prog; 1879 chp->done = done; 1880 chp->arg = arg; 1881 chp->next = children; 1882 chp->killable = killable; 1883 children = chp; 1884 } 1885 } 1886 1887 /* 1888 * childwait_end - we got fed up waiting for the child processes to 1889 * exit, send them all a SIGTERM. 1890 */ 1891 static void 1892 childwait_end(arg) 1893 void *arg; 1894 { 1895 struct subprocess *chp; 1896 1897 for (chp = children; chp != NULL; chp = chp->next) { 1898 if (debug) 1899 dbglog("sending SIGTERM to process %d", chp->pid); 1900 kill(chp->pid, SIGTERM); 1901 } 1902 childwait_done = 1; 1903 } 1904 1905 /* 1906 * forget_child - clean up after a dead child 1907 */ 1908 static void 1909 forget_child(pid, status) 1910 int pid, status; 1911 { 1912 struct subprocess *chp, **prevp; 1913 1914 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { 1915 if (chp->pid == pid) { 1916 --n_children; 1917 *prevp = chp->next; 1918 break; 1919 } 1920 } 1921 if (WIFSIGNALED(status)) { 1922 warn("Child process %s (pid %d) terminated with signal %d", 1923 (chp? chp->prog: "??"), pid, WTERMSIG(status)); 1924 } else if (debug) 1925 dbglog("Script %s finished (pid %d), status = 0x%x", 1926 (chp? chp->prog: "??"), pid, 1927 WIFEXITED(status) ? WEXITSTATUS(status) : status); 1928 if (chp && chp->done) 1929 (*chp->done)(chp->arg); 1930 if (chp) 1931 free(chp); 1932 } 1933 1934 /* 1935 * reap_kids - get status from any dead child processes, 1936 * and log a message for abnormal terminations. 1937 */ 1938 static int 1939 reap_kids() 1940 { 1941 int pid, status; 1942 1943 if (n_children == 0) 1944 return 0; 1945 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) { 1946 forget_child(pid, status); 1947 } 1948 if (pid == -1) { 1949 if (errno == ECHILD) 1950 return -1; 1951 if (errno != EINTR) 1952 error("Error waiting for child process: %m"); 1953 } 1954 return 0; 1955 } 1956 1957 /* 1958 * add_notifier - add a new function to be called when something happens. 1959 */ 1960 void 1961 add_notifier(notif, func, arg) 1962 struct notifier **notif; 1963 notify_func func; 1964 void *arg; 1965 { 1966 struct notifier *np; 1967 1968 np = malloc(sizeof(struct notifier)); 1969 if (np == 0) 1970 novm("notifier struct"); 1971 np->next = *notif; 1972 np->func = func; 1973 np->arg = arg; 1974 *notif = np; 1975 } 1976 1977 /* 1978 * remove_notifier - remove a function from the list of things to 1979 * be called when something happens. 1980 */ 1981 void 1982 remove_notifier(notif, func, arg) 1983 struct notifier **notif; 1984 notify_func func; 1985 void *arg; 1986 { 1987 struct notifier *np; 1988 1989 for (; (np = *notif) != 0; notif = &np->next) { 1990 if (np->func == func && np->arg == arg) { 1991 *notif = np->next; 1992 free(np); 1993 break; 1994 } 1995 } 1996 } 1997 1998 /* 1999 * notify - call a set of functions registered with add_notifier. 2000 */ 2001 void 2002 notify(notif, val) 2003 struct notifier *notif; 2004 int val; 2005 { 2006 struct notifier *np; 2007 2008 while ((np = notif) != 0) { 2009 notif = np->next; 2010 (*np->func)(np->arg, val); 2011 } 2012 } 2013 2014 /* 2015 * novm - log an error message saying we ran out of memory, and die. 2016 */ 2017 void 2018 novm(msg) 2019 char *msg; 2020 { 2021 fatal("Virtual memory exhausted allocating %s\n", msg); 2022 } 2023 2024 /* 2025 * script_setenv - set an environment variable value to be used 2026 * for scripts that we run (e.g. ip-up, auth-up, etc.) 2027 */ 2028 void 2029 script_setenv(var, value, iskey) 2030 char *var, *value; 2031 int iskey; 2032 { 2033 size_t varl = strlen(var); 2034 size_t vl = varl + strlen(value) + 2; 2035 int i; 2036 char *p, *newstring; 2037 2038 newstring = (char *) malloc(vl+1); 2039 if (newstring == 0) 2040 return; 2041 *newstring++ = iskey; 2042 slprintf(newstring, vl, "%s=%s", var, value); 2043 2044 /* check if this variable is already set */ 2045 if (script_env != 0) { 2046 for (i = 0; (p = script_env[i]) != 0; ++i) { 2047 if (strncmp(p, var, varl) == 0 && p[varl] == '=') { 2048 #ifdef USE_TDB 2049 if (p[-1] && pppdb != NULL) 2050 delete_db_key(p); 2051 #endif 2052 free(p-1); 2053 script_env[i] = newstring; 2054 #ifdef USE_TDB 2055 if (pppdb != NULL) { 2056 if (iskey) 2057 add_db_key(newstring); 2058 update_db_entry(); 2059 } 2060 #endif 2061 return; 2062 } 2063 } 2064 } else { 2065 /* no space allocated for script env. ptrs. yet */ 2066 i = 0; 2067 script_env = malloc(16 * sizeof(char *)); 2068 if (script_env == 0) { 2069 free(newstring - 1); 2070 return; 2071 } 2072 s_env_nalloc = 16; 2073 } 2074 2075 if (!add_script_env(i, newstring)) 2076 return; 2077 2078 #ifdef USE_TDB 2079 if (pppdb != NULL) { 2080 if (iskey) 2081 add_db_key(newstring); 2082 update_db_entry(); 2083 } 2084 #endif 2085 } 2086 2087 /* 2088 * script_unsetenv - remove a variable from the environment 2089 * for scripts. 2090 */ 2091 void 2092 script_unsetenv(var) 2093 char *var; 2094 { 2095 int vl = strlen(var); 2096 int i; 2097 char *p; 2098 2099 if (script_env == 0) 2100 return; 2101 for (i = 0; (p = script_env[i]) != 0; ++i) { 2102 if (strncmp(p, var, vl) == 0 && p[vl] == '=') { 2103 #ifdef USE_TDB 2104 if (p[-1] && pppdb != NULL) 2105 delete_db_key(p); 2106 #endif 2107 remove_script_env(i); 2108 break; 2109 } 2110 } 2111 #ifdef USE_TDB 2112 if (pppdb != NULL) 2113 update_db_entry(); 2114 #endif 2115 } 2116 2117 /* 2118 * Any arbitrary string used as a key for locking the database. 2119 * It doesn't matter what it is as long as all pppds use the same string. 2120 */ 2121 #define PPPD_LOCK_KEY "pppd lock" 2122 2123 /* 2124 * lock_db - get an exclusive lock on the TDB database. 2125 * Used to ensure atomicity of various lookup/modify operations. 2126 */ 2127 void lock_db() 2128 { 2129 #ifdef USE_TDB 2130 TDB_DATA key; 2131 2132 key.dptr = PPPD_LOCK_KEY; 2133 key.dsize = strlen(key.dptr); 2134 tdb_chainlock(pppdb, key); 2135 #endif 2136 } 2137 2138 /* 2139 * unlock_db - remove the exclusive lock obtained by lock_db. 2140 */ 2141 void unlock_db() 2142 { 2143 #ifdef USE_TDB 2144 TDB_DATA key; 2145 2146 key.dptr = PPPD_LOCK_KEY; 2147 key.dsize = strlen(key.dptr); 2148 tdb_chainunlock(pppdb, key); 2149 #endif 2150 } 2151 2152 #ifdef USE_TDB 2153 /* 2154 * update_db_entry - update our entry in the database. 2155 */ 2156 static void 2157 update_db_entry() 2158 { 2159 TDB_DATA key, dbuf; 2160 int vlen, i; 2161 char *p, *q, *vbuf; 2162 2163 if (script_env == NULL) 2164 return; 2165 vlen = 0; 2166 for (i = 0; (p = script_env[i]) != 0; ++i) 2167 vlen += strlen(p) + 1; 2168 vbuf = malloc(vlen + 1); 2169 if (vbuf == 0) 2170 novm("database entry"); 2171 q = vbuf; 2172 for (i = 0; (p = script_env[i]) != 0; ++i) 2173 q += slprintf(q, vbuf + vlen - q, "%s;", p); 2174 2175 key.dptr = db_key; 2176 key.dsize = strlen(db_key); 2177 dbuf.dptr = vbuf; 2178 dbuf.dsize = vlen; 2179 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2180 error("tdb_store failed: %s", tdb_errorstr(pppdb)); 2181 2182 if (vbuf) 2183 free(vbuf); 2184 2185 } 2186 2187 /* 2188 * add_db_key - add a key that we can use to look up our database entry. 2189 */ 2190 static void 2191 add_db_key(str) 2192 const char *str; 2193 { 2194 TDB_DATA key, dbuf; 2195 2196 key.dptr = (char *) str; 2197 key.dsize = strlen(str); 2198 dbuf.dptr = db_key; 2199 dbuf.dsize = strlen(db_key); 2200 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 2201 error("tdb_store key failed: %s", tdb_errorstr(pppdb)); 2202 } 2203 2204 /* 2205 * delete_db_key - delete a key for looking up our database entry. 2206 */ 2207 static void 2208 delete_db_key(str) 2209 const char *str; 2210 { 2211 TDB_DATA key; 2212 2213 key.dptr = (char *) str; 2214 key.dsize = strlen(str); 2215 tdb_delete(pppdb, key); 2216 } 2217 2218 /* 2219 * cleanup_db - delete all the entries we put in the database. 2220 */ 2221 static void 2222 cleanup_db() 2223 { 2224 TDB_DATA key; 2225 int i; 2226 char *p; 2227 2228 key.dptr = db_key; 2229 key.dsize = strlen(db_key); 2230 tdb_delete(pppdb, key); 2231 for (i = 0; (p = script_env[i]) != 0; ++i) 2232 if (p[-1]) 2233 delete_db_key(p); 2234 } 2235 #endif /* USE_TDB */ 2236