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