1/* 2 * main.c - Point-to-Point Protocol main module 3 * 4 * Copyright (c) 1989 Carnegie Mellon University. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms are permitted 8 * provided that the above copyright notice and this paragraph are 9 * duplicated in all such forms and that any documentation, 10 * advertising materials, and other materials related to such 11 * distribution and use acknowledge that the software was developed 12 * by Carnegie Mellon University. The name of the 13 * University may not be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 18 */ 19 20#define RCSID "$Id: main.c,v 1.1.1.1 2008/10/15 03:30:13 james26_jang Exp $" 21 22#include <stdio.h> 23#include <ctype.h> 24#include <stdlib.h> 25#include <string.h> 26#include <unistd.h> 27#include <signal.h> 28#include <errno.h> 29#include <fcntl.h> 30#include <syslog.h> 31#include <netdb.h> 32#include <utmp.h> 33#include <pwd.h> 34#include <setjmp.h> 35#include <sys/param.h> 36#include <sys/types.h> 37#include <sys/wait.h> 38#include <sys/time.h> 39#include <sys/resource.h> 40#include <sys/stat.h> 41#include <sys/socket.h> 42#include <netinet/in.h> 43#include <arpa/inet.h> 44 45#include "pppd.h" 46#include "magic.h" 47#include "fsm.h" 48#include "lcp.h" 49#include "ipcp.h" 50#ifdef INET6 51#include "ipv6cp.h" 52#endif 53#include "upap.h" 54#include "chap.h" 55#include "ccp.h" 56#include "pathnames.h" 57#include "tdb.h" 58 59#ifdef CBCP_SUPPORT 60#include "cbcp.h" 61#endif 62 63#ifdef IPX_CHANGE 64#include "ipxcp.h" 65#endif /* IPX_CHANGE */ 66#ifdef AT_CHANGE 67#include "atcp.h" 68#endif 69 70static const char rcsid[] = RCSID; 71 72/* interface vars */ 73char ifname[32]; /* Interface name */ 74int ifunit; /* Interface unit number */ 75 76struct channel *the_channel; 77 78char *progname; /* Name of this program */ 79char hostname[MAXNAMELEN]; /* Our hostname */ 80static char pidfilename[MAXPATHLEN]; /* name of pid file */ 81static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ 82char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ 83uid_t uid; /* Our real user-id */ 84struct notifier *pidchange = NULL; 85struct notifier *phasechange = NULL; 86struct notifier *exitnotify = NULL; 87struct notifier *sigreceived = NULL; 88 89int hungup; /* terminal has been hung up */ 90int privileged; /* we're running as real uid root */ 91int need_holdoff; /* need holdoff period before restarting */ 92int detached; /* have detached from terminal */ 93volatile int status; /* exit status for pppd */ 94int unsuccess; /* # unsuccessful connection attempts */ 95int do_callback; /* != 0 if we should do callback next */ 96int doing_callback; /* != 0 if we are doing callback */ 97TDB_CONTEXT *pppdb; /* database for storing status etc. */ 98char db_key[32]; 99 100int (*holdoff_hook) __P((void)) = NULL; 101int (*new_phase_hook) __P((int)) = NULL; 102 103static int conn_running; /* we have a [dis]connector running */ 104static int devfd; /* fd of underlying device */ 105static int fd_ppp = -1; /* fd for talking PPP */ 106static int fd_loop; /* fd for getting demand-dial packets */ 107 108int phase; /* where the link is at */ 109int kill_link; 110int open_ccp_flag; 111int listen_time; 112int got_sigusr2; 113int got_sigterm; 114int got_sighup; 115 116static int waiting; 117static sigjmp_buf sigjmp; 118 119char **script_env; /* Env. variable values for scripts */ 120int s_env_nalloc; /* # words avail at script_env */ 121 122u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ 123u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ 124 125static int n_children; /* # child processes still running */ 126static int got_sigchld; /* set if we have received a SIGCHLD */ 127 128int privopen; /* don't lock, open device as root */ 129 130char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; 131 132GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ 133int ngroups; /* How many groups valid in groups */ 134 135static struct timeval start_time; /* Time when link was started. */ 136 137struct pppd_stats link_stats; 138int link_connect_time; 139int link_stats_valid; 140 141/* 142 * We maintain a list of child process pids and 143 * functions to call when they exit. 144 */ 145struct subprocess { 146 pid_t pid; 147 char *prog; 148 void (*done) __P((void *)); 149 void *arg; 150 struct subprocess *next; 151}; 152 153static struct subprocess *children; 154 155/* Prototypes for procedures local to this file. */ 156 157static void setup_signals __P((void)); 158static void create_pidfile __P((void)); 159static void create_linkpidfile __P((void)); 160static void cleanup __P((void)); 161static void get_input __P((void)); 162static void calltimeout __P((void)); 163static struct timeval *timeleft __P((struct timeval *)); 164static void kill_my_pg __P((int)); 165static void hup __P((int)); 166static void term __P((int)); 167static void chld __P((int)); 168static void toggle_debug __P((int)); 169static void open_ccp __P((int)); 170static void bad_signal __P((int)); 171static void holdoff_end __P((void *)); 172static int reap_kids __P((int waitfor)); 173static void update_db_entry __P((void)); 174static void add_db_key __P((const char *)); 175static void delete_db_key __P((const char *)); 176static void cleanup_db __P((void)); 177static void handle_events __P((void)); 178 179extern char *ttyname __P((int)); 180extern char *getlogin __P((void)); 181int main __P((int, char *[])); 182 183#ifdef ultrix 184#undef O_NONBLOCK 185#define O_NONBLOCK O_NDELAY 186#endif 187 188#ifdef ULTRIX 189#define setlogmask(x) 190#endif 191 192/* 193 * PPP Data Link Layer "protocol" table. 194 * One entry per supported protocol. 195 * The last entry must be NULL. 196 */ 197struct protent *protocols[] = { 198 &lcp_protent, 199 &pap_protent, 200 &chap_protent, 201#ifdef CBCP_SUPPORT 202 &cbcp_protent, 203#endif 204 &ipcp_protent, 205#ifdef INET6 206 &ipv6cp_protent, 207#endif 208 &ccp_protent, 209#ifdef IPX_CHANGE 210 &ipxcp_protent, 211#endif 212#ifdef AT_CHANGE 213 &atcp_protent, 214#endif 215 NULL 216}; 217 218/* 219 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. 220 */ 221#if !defined(PPP_DRV_NAME) 222#define PPP_DRV_NAME "ppp" 223#endif /* !defined(PPP_DRV_NAME) */ 224 225int 226main(argc, argv) 227 int argc; 228 char *argv[]; 229{ 230 int i, t; 231 char *p; 232 struct passwd *pw; 233 struct protent *protp; 234 char numbuf[16]; 235 236 new_phase(PHASE_INITIALIZE); 237 238 /* 239 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else. 240 * This way we can close 0, 1, 2 in detach() without clobbering 241 * a fd that we are using. 242 */ 243 if ((i = open("/dev/null", O_RDWR)) >= 0) { 244 while (0 <= i && i <= 2) 245 i = dup(i); 246 if (i >= 0) 247 close(i); 248 } 249 250 script_env = NULL; 251 252 /* Initialize syslog facilities */ 253 reopen_log(); 254 255 if (gethostname(hostname, MAXNAMELEN) < 0 ) { 256 option_error("Couldn't get hostname: %m"); 257 exit(1); 258 } 259 hostname[MAXNAMELEN-1] = 0; 260 261 /* make sure we don't create world or group writable files. */ 262 umask(umask(0777) | 022); 263 264 uid = getuid(); 265 privileged = uid == 0; 266 slprintf(numbuf, sizeof(numbuf), "%d", uid); 267 script_setenv("ORIG_UID", numbuf, 0); 268 269 ngroups = getgroups(NGROUPS_MAX, groups); 270 271 /* 272 * Initialize magic number generator now so that protocols may 273 * use magic numbers in initialization. 274 */ 275 magic_init(); 276 277 /* 278 * Initialize each protocol. 279 */ 280 for (i = 0; (protp = protocols[i]) != NULL; ++i) 281 (*protp->init)(0); 282 283 /* 284 * Initialize the default channel. 285 */ 286 tty_init(); 287 288 progname = *argv; 289 290 /* 291 * Parse, in order, the system options file, the user's options file, 292 * and the command line arguments. 293 */ 294 295 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) 296 || !options_from_user() 297 || !parse_args(argc-1, argv+1)) 298 exit(EXIT_OPTION_ERROR); 299 devnam_fixed = 1; /* can no longer change device name */ 300 301 /* 302 * Work out the device name, if it hasn't already been specified, 303 * and parse the tty's options file. 304 */ 305 if (the_channel->process_extra_options) 306 (*the_channel->process_extra_options)(); 307 308 if (debug) 309 setlogmask(LOG_UPTO(LOG_DEBUG)); 310 311 /* 312 * Check that we are running as root. 313 */ 314 if (geteuid() != 0) { 315 option_error("must be root to run %s, since it is not setuid-root", 316 argv[0]); 317 exit(EXIT_NOT_ROOT); 318 } 319 320 if (!ppp_available()) { 321 option_error("%s", no_ppp_msg); 322 exit(EXIT_NO_KERNEL_SUPPORT); 323 } 324 325 /* 326 * Check that the options given are valid and consistent. 327 */ 328 check_options(); 329 if (!sys_check_options()) 330 exit(EXIT_OPTION_ERROR); 331 auth_check_options(); 332#ifdef HAVE_MULTILINK 333 mp_check_options(); 334#endif 335 for (i = 0; (protp = protocols[i]) != NULL; ++i) 336 if (protp->check_options != NULL) 337 (*protp->check_options)(); 338 if (the_channel->check_options) 339 (*the_channel->check_options)(); 340 341 342 if (dump_options || dryrun) { 343 init_pr_log(NULL, LOG_INFO); 344 print_options(pr_log, NULL); 345 end_pr_log(); 346 if (dryrun) 347 die(0); 348 } 349 350 /* 351 * Initialize system-dependent stuff. 352 */ 353 sys_init(); 354 355 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); 356 if (pppdb != NULL) { 357 slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); 358 update_db_entry(); 359 } else { 360 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); 361 if (multilink) { 362 warn("Warning: disabling multilink"); 363 multilink = 0; 364 } 365 } 366 367 /* 368 * Detach ourselves from the terminal, if required, 369 * and identify who is running us. 370 */ 371 if (!nodetach && !updetach) 372 detach(); 373 p = getlogin(); 374 if (p == NULL) { 375 pw = getpwuid(uid); 376 if (pw != NULL && pw->pw_name != NULL) 377 p = pw->pw_name; 378 else 379 p = "(unknown)"; 380 } 381 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid); 382 script_setenv("PPPLOGNAME", p, 0); 383 384 if (devnam[0]) 385 script_setenv("DEVICE", devnam, 1); 386 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 387 script_setenv("PPPD_PID", numbuf, 1); 388 389 setup_signals(); 390 391 waiting = 0; 392 393 create_linkpidfile(); 394 395 /* 396 * If we're doing dial-on-demand, set up the interface now. 397 */ 398 if (demand) { 399 /* 400 * Open the loopback channel and set it up to be the ppp interface. 401 */ 402 tdb_writelock(pppdb); 403 fd_loop = open_ppp_loopback(); 404 set_ifunit(1); 405 tdb_writeunlock(pppdb); 406 407 /* 408 * Configure the interface and mark it up, etc. 409 */ 410 demand_conf(); 411 } 412 413 do_callback = 0; 414 for (;;) { 415 416 listen_time = 0; 417 need_holdoff = 1; 418 devfd = -1; 419 status = EXIT_OK; 420 ++unsuccess; 421 doing_callback = do_callback; 422 do_callback = 0; 423 424 if (demand && !doing_callback) { 425 /* 426 * Don't do anything until we see some activity. 427 */ 428 new_phase(PHASE_DORMANT); 429 demand_unblock(); 430 add_fd(fd_loop); 431 for (;;) { 432 handle_events(); 433 if (kill_link && !persist) 434 break; 435 if (get_loop_output()) 436 break; 437 } 438 remove_fd(fd_loop); 439 if (kill_link && !persist) 440 break; 441 442 /* 443 * Now we want to bring up the link. 444 */ 445 demand_block(); 446 info("Starting link"); 447 } 448 449 new_phase(PHASE_SERIALCONN); 450 451 devfd = the_channel->connect(); 452 if (devfd < 0) 453 goto fail; 454 455 /* set up the serial device as a ppp interface */ 456 tdb_writelock(pppdb); 457 fd_ppp = the_channel->establish_ppp(devfd); 458 if (fd_ppp < 0) { 459 tdb_writeunlock(pppdb); 460 status = EXIT_FATAL_ERROR; 461 goto disconnect; 462 } 463 464 if (!demand && ifunit >= 0) 465 set_ifunit(1); 466 tdb_writeunlock(pppdb); 467 468 /* 469 * Start opening the connection and wait for 470 * incoming events (reply, timeout, etc.). 471 */ 472 notice("Connect: %s <--> %s", ifname, ppp_devnam); 473 gettimeofday(&start_time, NULL); 474 link_stats_valid = 0; 475 script_unsetenv("CONNECT_TIME"); 476 script_unsetenv("BYTES_SENT"); 477 script_unsetenv("BYTES_RCVD"); 478 lcp_lowerup(0); 479 480 add_fd(fd_ppp); 481 lcp_open(0); /* Start protocol */ 482 status = EXIT_NEGOTIATION_FAILED; 483 new_phase(PHASE_ESTABLISH); 484 while (phase != PHASE_DEAD) { 485 handle_events(); 486 get_input(); 487 if (kill_link) 488 lcp_close(0, "User request"); 489 if (open_ccp_flag) { 490 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { 491 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ 492 (*ccp_protent.open)(0); 493 } 494 } 495 } 496 497 /* 498 * Print connect time and statistics. 499 */ 500 if (link_stats_valid) { 501 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ 502 info("Connect time %d.%d minutes.", t/10, t%10); 503 info("Sent %u bytes, received %u bytes.", 504 link_stats.bytes_out, link_stats.bytes_in); 505 } 506 507 /* 508 * Delete pid file before disestablishing ppp. Otherwise it 509 * can happen that another pppd gets the same unit and then 510 * we delete its pid file. 511 */ 512 if (!demand) { 513 if (pidfilename[0] != 0 514 && unlink(pidfilename) < 0 && errno != ENOENT) 515 warn("unable to delete pid file %s: %m", pidfilename); 516 pidfilename[0] = 0; 517 } 518 519 /* 520 * If we may want to bring the link up again, transfer 521 * the ppp unit back to the loopback. Set the 522 * real serial device back to its normal mode of operation. 523 */ 524 remove_fd(fd_ppp); 525 clean_check(); 526 the_channel->disestablish_ppp(devfd); 527 fd_ppp = -1; 528 if (!hungup) 529 lcp_lowerdown(0); 530 if (!demand) 531 script_unsetenv("IFNAME"); 532 533 disconnect: 534 new_phase(PHASE_DISCONNECT); 535 the_channel->disconnect(); 536 537 fail: 538 if (the_channel->cleanup) 539 (*the_channel->cleanup)(); 540 541 if (!demand) { 542 if (pidfilename[0] != 0 543 && unlink(pidfilename) < 0 && errno != ENOENT) 544 warn("unable to delete pid file %s: %m", pidfilename); 545 pidfilename[0] = 0; 546 } 547 548 if (!persist || (maxfail > 0 && unsuccess >= maxfail)) 549 break; 550 551 if (demand) 552 demand_discard(); 553 t = need_holdoff? holdoff: 0; 554 if (holdoff_hook) 555 t = (*holdoff_hook)(); 556 if (t > 0) { 557 new_phase(PHASE_HOLDOFF); 558 TIMEOUT(holdoff_end, NULL, t); 559 do { 560 handle_events(); 561 if (kill_link) 562 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ 563 } while (phase == PHASE_HOLDOFF); 564 if (!persist) 565 break; 566 } 567 } 568 569 /* Wait for scripts to finish */ 570 while (n_children > 0) { 571 if (debug) { 572 struct subprocess *chp; 573 dbglog("Waiting for %d child processes...", n_children); 574 for (chp = children; chp != NULL; chp = chp->next) 575 dbglog(" script %s, pid %d", chp->prog, chp->pid); 576 } 577 if (reap_kids(1) < 0) 578 break; 579 } 580 581 die(status); 582 return 0; 583} 584 585/* 586 * handle_events - wait for something to happen and respond to it. 587 */ 588static void 589handle_events() 590{ 591 struct timeval timo; 592 sigset_t mask; 593 594 kill_link = open_ccp_flag = 0; 595 if (sigsetjmp(sigjmp, 1) == 0) { 596 sigprocmask(SIG_BLOCK, &mask, NULL); 597 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { 598 sigprocmask(SIG_UNBLOCK, &mask, NULL); 599 } else { 600 waiting = 1; 601 sigprocmask(SIG_UNBLOCK, &mask, NULL); 602 wait_input(timeleft(&timo)); 603 } 604 } 605 waiting = 0; 606 calltimeout(); 607 if (got_sighup) { 608 kill_link = 1; 609 got_sighup = 0; 610 if (status != EXIT_HANGUP) 611 status = EXIT_USER_REQUEST; 612 } 613 if (got_sigterm) { 614 kill_link = 1; 615 persist = 0; 616 status = EXIT_USER_REQUEST; 617 got_sigterm = 0; 618 } 619 if (got_sigchld) { 620 reap_kids(0); /* Don't leave dead kids lying around */ 621 got_sigchld = 0; 622 } 623 if (got_sigusr2) { 624 open_ccp_flag = 1; 625 got_sigusr2 = 0; 626 } 627} 628 629/* 630 * setup_signals - initialize signal handling. 631 */ 632static void 633setup_signals() 634{ 635 struct sigaction sa; 636 sigset_t mask; 637 638 /* 639 * Compute mask of all interesting signals and install signal handlers 640 * for each. Only one signal handler may be active at a time. Therefore, 641 * all other signals should be masked when any handler is executing. 642 */ 643 sigemptyset(&mask); 644 sigaddset(&mask, SIGHUP); 645 sigaddset(&mask, SIGINT); 646 sigaddset(&mask, SIGTERM); 647 sigaddset(&mask, SIGCHLD); 648 sigaddset(&mask, SIGUSR2); 649 650#define SIGNAL(s, handler) do { \ 651 sa.sa_handler = handler; \ 652 if (sigaction(s, &sa, NULL) < 0) \ 653 fatal("Couldn't establish signal handler (%d): %m", s); \ 654 } while (0) 655 656 sa.sa_mask = mask; 657 sa.sa_flags = 0; 658 SIGNAL(SIGHUP, hup); /* Hangup */ 659 SIGNAL(SIGINT, term); /* Interrupt */ 660 SIGNAL(SIGTERM, term); /* Terminate */ 661 SIGNAL(SIGCHLD, chld); 662 663 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ 664 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ 665 666 /* 667 * Install a handler for other signals which would otherwise 668 * cause pppd to exit without cleaning up. 669 */ 670 SIGNAL(SIGABRT, bad_signal); 671 SIGNAL(SIGALRM, bad_signal); 672 SIGNAL(SIGFPE, bad_signal); 673 SIGNAL(SIGILL, bad_signal); 674 SIGNAL(SIGPIPE, bad_signal); 675 SIGNAL(SIGQUIT, bad_signal); 676 SIGNAL(SIGSEGV, bad_signal); 677#ifdef SIGBUS 678 SIGNAL(SIGBUS, bad_signal); 679#endif 680#ifdef SIGEMT 681 SIGNAL(SIGEMT, bad_signal); 682#endif 683#ifdef SIGPOLL 684 SIGNAL(SIGPOLL, bad_signal); 685#endif 686#ifdef SIGPROF 687 SIGNAL(SIGPROF, bad_signal); 688#endif 689#ifdef SIGSYS 690 SIGNAL(SIGSYS, bad_signal); 691#endif 692#ifdef SIGTRAP 693 SIGNAL(SIGTRAP, bad_signal); 694#endif 695#ifdef SIGVTALRM 696 SIGNAL(SIGVTALRM, bad_signal); 697#endif 698#ifdef SIGXCPU 699 SIGNAL(SIGXCPU, bad_signal); 700#endif 701#ifdef SIGXFSZ 702 SIGNAL(SIGXFSZ, bad_signal); 703#endif 704 705 /* 706 * Apparently we can get a SIGPIPE when we call syslog, if 707 * syslogd has died and been restarted. Ignoring it seems 708 * be sufficient. 709 */ 710 signal(SIGPIPE, SIG_IGN); 711} 712 713/* 714 * set_ifunit - do things we need to do once we know which ppp 715 * unit we are using. 716 */ 717void 718set_ifunit(iskey) 719 int iskey; 720{ 721 info("Using interface %s%d", PPP_DRV_NAME, ifunit); 722 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit); 723 script_setenv("IFNAME", ifname, iskey); 724 if (iskey) { 725 create_pidfile(); /* write pid to file */ 726 create_linkpidfile(); 727 } 728} 729 730/* 731 * detach - detach us from the controlling terminal. 732 */ 733void 734detach() 735{ 736 int pid; 737 char numbuf[16]; 738 739 if (detached) 740 return; 741 if ((pid = fork()) < 0) { 742 error("Couldn't detach (fork failed: %m)"); 743 die(1); /* or just return? */ 744 } 745 if (pid != 0) { 746 /* parent */ 747 notify(pidchange, pid); 748 exit(0); /* parent dies */ 749 } 750 setsid(); 751 chdir("/"); 752 close(0); 753 close(1); 754 close(2); 755 detached = 1; 756 if (log_default) 757 log_to_fd = -1; 758 /* update pid files if they have been written already */ 759 if (pidfilename[0]) 760 create_pidfile(); 761 if (linkpidfile[0]) 762 create_linkpidfile(); 763 slprintf(numbuf, sizeof(numbuf), "%d", getpid()); 764 script_setenv("PPPD_PID", numbuf, 1); 765} 766 767/* 768 * reopen_log - (re)open our connection to syslog. 769 */ 770void 771reopen_log() 772{ 773#ifdef ULTRIX 774 openlog("pppd", LOG_PID); 775#else 776 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); 777 setlogmask(LOG_UPTO(LOG_INFO)); 778#endif 779} 780 781/* 782 * Create a file containing our process ID. 783 */ 784static void 785create_pidfile() 786{ 787 FILE *pidfile; 788 789 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", 790 _PATH_VARRUN, ifname); 791 if ((pidfile = fopen(pidfilename, "w")) != NULL) { 792 fprintf(pidfile, "%d\n", getpid()); 793 (void) fclose(pidfile); 794 } else { 795 error("Failed to create pid file %s: %m", pidfilename); 796 pidfilename[0] = 0; 797 } 798} 799 800static void 801create_linkpidfile() 802{ 803 FILE *pidfile; 804 805 if (linkname[0] == 0) 806 return; 807 script_setenv("LINKNAME", linkname, 1); 808 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", 809 _PATH_VARRUN, linkname); 810 if ((pidfile = fopen(linkpidfile, "w")) != NULL) { 811 fprintf(pidfile, "%d\n", getpid()); 812 if (ifname[0]) 813 fprintf(pidfile, "%s\n", ifname); 814 (void) fclose(pidfile); 815 } else { 816 error("Failed to create pid file %s: %m", linkpidfile); 817 linkpidfile[0] = 0; 818 } 819} 820 821/* 822 * holdoff_end - called via a timeout when the holdoff period ends. 823 */ 824static void 825holdoff_end(arg) 826 void *arg; 827{ 828 new_phase(PHASE_DORMANT); 829} 830 831/* List of protocol names, to make our messages a little more informative. */ 832struct protocol_list { 833 u_short proto; 834 const char *name; 835} protocol_list[] = { 836 { 0x21, "IP" }, 837 { 0x23, "OSI Network Layer" }, 838 { 0x25, "Xerox NS IDP" }, 839 { 0x27, "DECnet Phase IV" }, 840 { 0x29, "Appletalk" }, 841 { 0x2b, "Novell IPX" }, 842 { 0x2d, "VJ compressed TCP/IP" }, 843 { 0x2f, "VJ uncompressed TCP/IP" }, 844 { 0x31, "Bridging PDU" }, 845 { 0x33, "Stream Protocol ST-II" }, 846 { 0x35, "Banyan Vines" }, 847 { 0x39, "AppleTalk EDDP" }, 848 { 0x3b, "AppleTalk SmartBuffered" }, 849 { 0x3d, "Multi-Link" }, 850 { 0x3f, "NETBIOS Framing" }, 851 { 0x41, "Cisco Systems" }, 852 { 0x43, "Ascom Timeplex" }, 853 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, 854 { 0x47, "DCA Remote Lan" }, 855 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, 856 { 0x4b, "SNA over 802.2" }, 857 { 0x4d, "SNA" }, 858 { 0x4f, "IP6 Header Compression" }, 859 { 0x6f, "Stampede Bridging" }, 860 { 0xfb, "single-link compression" }, 861 { 0xfd, "1st choice compression" }, 862 { 0x0201, "802.1d Hello Packets" }, 863 { 0x0203, "IBM Source Routing BPDU" }, 864 { 0x0205, "DEC LANBridge100 Spanning Tree" }, 865 { 0x0231, "Luxcom" }, 866 { 0x0233, "Sigma Network Systems" }, 867 { 0x8021, "Internet Protocol Control Protocol" }, 868 { 0x8023, "OSI Network Layer Control Protocol" }, 869 { 0x8025, "Xerox NS IDP Control Protocol" }, 870 { 0x8027, "DECnet Phase IV Control Protocol" }, 871 { 0x8029, "Appletalk Control Protocol" }, 872 { 0x802b, "Novell IPX Control Protocol" }, 873 { 0x8031, "Bridging NCP" }, 874 { 0x8033, "Stream Protocol Control Protocol" }, 875 { 0x8035, "Banyan Vines Control Protocol" }, 876 { 0x803d, "Multi-Link Control Protocol" }, 877 { 0x803f, "NETBIOS Framing Control Protocol" }, 878 { 0x8041, "Cisco Systems Control Protocol" }, 879 { 0x8043, "Ascom Timeplex" }, 880 { 0x8045, "Fujitsu LBLB Control Protocol" }, 881 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, 882 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, 883 { 0x804b, "SNA over 802.2 Control Protocol" }, 884 { 0x804d, "SNA Control Protocol" }, 885 { 0x804f, "IP6 Header Compression Control Protocol" }, 886 { 0x006f, "Stampede Bridging Control Protocol" }, 887 { 0x80fb, "Single Link Compression Control Protocol" }, 888 { 0x80fd, "Compression Control Protocol" }, 889 { 0xc021, "Link Control Protocol" }, 890 { 0xc023, "Password Authentication Protocol" }, 891 { 0xc025, "Link Quality Report" }, 892 { 0xc027, "Shiva Password Authentication Protocol" }, 893 { 0xc029, "CallBack Control Protocol (CBCP)" }, 894 { 0xc081, "Container Control Protocol" }, 895 { 0xc223, "Challenge Handshake Authentication Protocol" }, 896 { 0xc281, "Proprietary Authentication Protocol" }, 897 { 0, NULL }, 898}; 899 900/* 901 * protocol_name - find a name for a PPP protocol. 902 */ 903const char * 904protocol_name(proto) 905 int proto; 906{ 907 struct protocol_list *lp; 908 909 for (lp = protocol_list; lp->proto != 0; ++lp) 910 if (proto == lp->proto) 911 return lp->name; 912 return NULL; 913} 914 915/* 916 * get_input - called when incoming data is available. 917 */ 918static void 919get_input() 920{ 921 int len, i; 922 u_char *p; 923 u_short protocol; 924 struct protent *protp; 925 926 p = inpacket_buf; /* point to beginning of packet buffer */ 927 928 len = read_packet(inpacket_buf); 929 if (len < 0) 930 return; 931 932 if (len == 0) { 933 notice("Modem hangup"); 934 hungup = 1; 935 status = EXIT_HANGUP; 936 lcp_lowerdown(0); /* serial link is no longer available */ 937 link_terminated(0); 938 return; 939 } 940 941 if (debug /*&& (debugflags & DBG_INPACKET)*/) 942 dbglog("rcvd %P", p, len); 943 944 if (len < PPP_HDRLEN) { 945 MAINDEBUG(("io(): Received short packet.")); 946 return; 947 } 948 949 p += 2; /* Skip address and control */ 950 GETSHORT(protocol, p); 951 len -= PPP_HDRLEN; 952 953 /* 954 * Toss all non-LCP packets unless LCP is OPEN. 955 */ 956 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { 957 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open.")); 958 return; 959 } 960 961 /* 962 * Until we get past the authentication phase, toss all packets 963 * except LCP, LQR and authentication packets. 964 */ 965 if (phase <= PHASE_AUTHENTICATE 966 && !(protocol == PPP_LCP || protocol == PPP_LQR 967 || protocol == PPP_PAP || protocol == PPP_CHAP)) { 968 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d", 969 protocol, phase)); 970 return; 971 } 972 973 /* 974 * Upcall the proper protocol input routine. 975 */ 976 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 977 if (protp->protocol == protocol && protp->enabled_flag) { 978 (*protp->input)(0, p, len); 979 return; 980 } 981 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag 982 && protp->datainput != NULL) { 983 (*protp->datainput)(0, p, len); 984 return; 985 } 986 } 987 988 if (debug) { 989 const char *pname = protocol_name(protocol); 990 if (pname != NULL) 991 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); 992 else 993 warn("Unsupported protocol 0x%x received", protocol); 994 } 995 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); 996} 997 998/* 999 * new_phase - signal the start of a new phase of pppd's operation. 1000 */ 1001void 1002new_phase(p) 1003 int p; 1004{ 1005 phase = p; 1006 if (new_phase_hook) 1007 (*new_phase_hook)(p); 1008 notify(phasechange, p); 1009} 1010 1011/* 1012 * die - clean up state and exit with the specified status. 1013 */ 1014void 1015die(status) 1016 int status; 1017{ 1018 cleanup(); 1019 notify(exitnotify, status); 1020 syslog(LOG_INFO, "Exit."); 1021 exit(status); 1022} 1023 1024/* 1025 * cleanup - restore anything which needs to be restored before we exit 1026 */ 1027/* ARGSUSED */ 1028static void 1029cleanup() 1030{ 1031 sys_cleanup(); 1032 1033 if (fd_ppp >= 0) 1034 the_channel->disestablish_ppp(devfd); 1035 if (the_channel->cleanup) 1036 (*the_channel->cleanup)(); 1037 1038 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) 1039 warn("unable to delete pid file %s: %m", pidfilename); 1040 pidfilename[0] = 0; 1041 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT) 1042 warn("unable to delete pid file %s: %m", linkpidfile); 1043 linkpidfile[0] = 0; 1044 1045 if (pppdb != NULL) 1046 cleanup_db(); 1047} 1048 1049/* 1050 * update_link_stats - get stats at link termination. 1051 */ 1052void 1053update_link_stats(u) 1054 int u; 1055{ 1056 struct timeval now; 1057 char numbuf[32]; 1058 1059 if (!get_ppp_stats(u, &link_stats) 1060 || gettimeofday(&now, NULL) < 0) 1061 return; 1062 link_connect_time = now.tv_sec - start_time.tv_sec; 1063 link_stats_valid = 1; 1064 1065 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time); 1066 script_setenv("CONNECT_TIME", numbuf, 0); 1067 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out); 1068 script_setenv("BYTES_SENT", numbuf, 0); 1069 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in); 1070 script_setenv("BYTES_RCVD", numbuf, 0); 1071} 1072 1073 1074struct callout { 1075 struct timeval c_time; /* time at which to call routine */ 1076 void *c_arg; /* argument to routine */ 1077 void (*c_func) __P((void *)); /* routine */ 1078 struct callout *c_next; 1079}; 1080 1081static struct callout *callout = NULL; /* Callout list */ 1082static struct timeval timenow; /* Current time */ 1083 1084/* 1085 * timeout - Schedule a timeout. 1086 * 1087 * Note that this timeout takes the number of milliseconds, NOT hz (as in 1088 * the kernel). 1089 */ 1090void 1091timeout(func, arg, secs, usecs) 1092 void (*func) __P((void *)); 1093 void *arg; 1094 int secs, usecs; 1095{ 1096 struct callout *newp, *p, **pp; 1097 1098 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg, 1099 time / 1000, time % 1000)); 1100 1101 /* 1102 * Allocate timeout. 1103 */ 1104 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) 1105 fatal("Out of memory in timeout()!"); 1106 newp->c_arg = arg; 1107 newp->c_func = func; 1108 gettimeofday(&timenow, NULL); 1109 newp->c_time.tv_sec = timenow.tv_sec + secs; 1110 newp->c_time.tv_usec = timenow.tv_usec + usecs; 1111 if (newp->c_time.tv_usec >= 1000000) { 1112 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000; 1113 newp->c_time.tv_usec %= 1000000; 1114 } 1115 1116 /* 1117 * Find correct place and link it in. 1118 */ 1119 for (pp = &callout; (p = *pp); pp = &p->c_next) 1120 if (newp->c_time.tv_sec < p->c_time.tv_sec 1121 || (newp->c_time.tv_sec == p->c_time.tv_sec 1122 && newp->c_time.tv_usec < p->c_time.tv_usec)) 1123 break; 1124 newp->c_next = p; 1125 *pp = newp; 1126} 1127 1128 1129/* 1130 * untimeout - Unschedule a timeout. 1131 */ 1132void 1133untimeout(func, arg) 1134 void (*func) __P((void *)); 1135 void *arg; 1136{ 1137 struct callout **copp, *freep; 1138 1139 MAINDEBUG(("Untimeout %p:%p.", func, arg)); 1140 1141 /* 1142 * Find first matching timeout and remove it from the list. 1143 */ 1144 for (copp = &callout; (freep = *copp); copp = &freep->c_next) 1145 if (freep->c_func == func && freep->c_arg == arg) { 1146 *copp = freep->c_next; 1147 free((char *) freep); 1148 break; 1149 } 1150} 1151 1152 1153/* 1154 * calltimeout - Call any timeout routines which are now due. 1155 */ 1156static void 1157calltimeout() 1158{ 1159 struct callout *p; 1160 1161 while (callout != NULL) { 1162 p = callout; 1163 1164 if (gettimeofday(&timenow, NULL) < 0) 1165 fatal("Failed to get time of day: %m"); 1166 if (!(p->c_time.tv_sec < timenow.tv_sec 1167 || (p->c_time.tv_sec == timenow.tv_sec 1168 && p->c_time.tv_usec <= timenow.tv_usec))) 1169 break; /* no, it's not time yet */ 1170 1171 callout = p->c_next; 1172 (*p->c_func)(p->c_arg); 1173 1174 free((char *) p); 1175 } 1176} 1177 1178 1179/* 1180 * timeleft - return the length of time until the next timeout is due. 1181 */ 1182static struct timeval * 1183timeleft(tvp) 1184 struct timeval *tvp; 1185{ 1186 if (callout == NULL) 1187 return NULL; 1188 1189 gettimeofday(&timenow, NULL); 1190 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; 1191 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; 1192 if (tvp->tv_usec < 0) { 1193 tvp->tv_usec += 1000000; 1194 tvp->tv_sec -= 1; 1195 } 1196 if (tvp->tv_sec < 0) 1197 tvp->tv_sec = tvp->tv_usec = 0; 1198 1199 return tvp; 1200} 1201 1202 1203/* 1204 * kill_my_pg - send a signal to our process group, and ignore it ourselves. 1205 */ 1206static void 1207kill_my_pg(sig) 1208 int sig; 1209{ 1210 struct sigaction act, oldact; 1211 1212 act.sa_handler = SIG_IGN; 1213 act.sa_flags = 0; 1214 kill(0, sig); 1215 sigaction(sig, &act, &oldact); 1216 sigaction(sig, &oldact, NULL); 1217} 1218 1219 1220/* 1221 * hup - Catch SIGHUP signal. 1222 * 1223 * Indicates that the physical layer has been disconnected. 1224 * We don't rely on this indication; if the user has sent this 1225 * signal, we just take the link down. 1226 */ 1227static void 1228hup(sig) 1229 int sig; 1230{ 1231 info("Hangup (SIGHUP)"); 1232 got_sighup = 1; 1233 if (conn_running) 1234 /* Send the signal to the [dis]connector process(es) also */ 1235 kill_my_pg(sig); 1236 notify(sigreceived, sig); 1237 if (waiting) 1238 siglongjmp(sigjmp, 1); 1239} 1240 1241 1242/* 1243 * term - Catch SIGTERM signal and SIGINT signal (^C/del). 1244 * 1245 * Indicates that we should initiate a graceful disconnect and exit. 1246 */ 1247/*ARGSUSED*/ 1248static void 1249term(sig) 1250 int sig; 1251{ 1252 info("Terminating on signal %d.", sig); 1253 got_sigterm = 1; 1254 if (conn_running) 1255 /* Send the signal to the [dis]connector process(es) also */ 1256 kill_my_pg(sig); 1257 notify(sigreceived, sig); 1258 if (waiting) 1259 siglongjmp(sigjmp, 1); 1260} 1261 1262 1263/* 1264 * chld - Catch SIGCHLD signal. 1265 * Sets a flag so we will call reap_kids in the mainline. 1266 */ 1267static void 1268chld(sig) 1269 int sig; 1270{ 1271 got_sigchld = 1; 1272 if (waiting) 1273 siglongjmp(sigjmp, 1); 1274} 1275 1276 1277/* 1278 * toggle_debug - Catch SIGUSR1 signal. 1279 * 1280 * Toggle debug flag. 1281 */ 1282/*ARGSUSED*/ 1283static void 1284toggle_debug(sig) 1285 int sig; 1286{ 1287 debug = !debug; 1288 if (debug) { 1289 setlogmask(LOG_UPTO(LOG_DEBUG)); 1290 } else { 1291 setlogmask(LOG_UPTO(LOG_WARNING)); 1292 } 1293} 1294 1295 1296/* 1297 * open_ccp - Catch SIGUSR2 signal. 1298 * 1299 * Try to (re)negotiate compression. 1300 */ 1301/*ARGSUSED*/ 1302static void 1303open_ccp(sig) 1304 int sig; 1305{ 1306 got_sigusr2 = 1; 1307 if (waiting) 1308 siglongjmp(sigjmp, 1); 1309} 1310 1311 1312/* 1313 * bad_signal - We've caught a fatal signal. Clean up state and exit. 1314 */ 1315static void 1316bad_signal(sig) 1317 int sig; 1318{ 1319 static int crashed = 0; 1320 1321 if (crashed) 1322 _exit(127); 1323 crashed = 1; 1324 error("Fatal signal %d", sig); 1325 if (conn_running) 1326 kill_my_pg(SIGTERM); 1327 notify(sigreceived, sig); 1328 die(127); 1329} 1330 1331 1332/* 1333 * device_script - run a program to talk to the specified fds 1334 * (e.g. to run the connector or disconnector script). 1335 * stderr gets connected to the log fd or to the _PATH_CONNERRS file. 1336 */ 1337int 1338device_script(program, in, out, dont_wait) 1339 char *program; 1340 int in, out; 1341 int dont_wait; 1342{ 1343 int pid, fd; 1344 int status = -1; 1345 int errfd; 1346 1347 ++conn_running; 1348 pid = fork(); 1349 1350 if (pid < 0) { 1351 --conn_running; 1352 error("Failed to create child process: %m"); 1353 return -1; 1354 } 1355 1356 if (pid != 0) { 1357 if (dont_wait) { 1358 record_child(pid, program, NULL, NULL); 1359 status = 0; 1360 } else { 1361 while (waitpid(pid, &status, 0) < 0) { 1362 if (errno == EINTR) 1363 continue; 1364 fatal("error waiting for (dis)connection process: %m"); 1365 } 1366 --conn_running; 1367 } 1368 return (status == 0 ? 0 : -1); 1369 } 1370 1371 /* here we are executing in the child */ 1372 /* make sure fds 0, 1, 2 are occupied */ 1373 while ((fd = dup(in)) >= 0) { 1374 if (fd > 2) { 1375 close(fd); 1376 break; 1377 } 1378 } 1379 1380 /* dup in and out to fds > 2 */ 1381 in = dup(in); 1382 out = dup(out); 1383 if (log_to_fd >= 0) { 1384 errfd = dup(log_to_fd); 1385 } else { 1386 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); 1387 } 1388 1389 /* close fds 0 - 2 and any others we can think of */ 1390 close(0); 1391 close(1); 1392 close(2); 1393 sys_close(); 1394 if (the_channel->close) 1395 (*the_channel->close)(); 1396 closelog(); 1397 1398 /* dup the in, out, err fds to 0, 1, 2 */ 1399 dup2(in, 0); 1400 close(in); 1401 dup2(out, 1); 1402 close(out); 1403 if (errfd >= 0) { 1404 dup2(errfd, 2); 1405 close(errfd); 1406 } 1407 1408 setuid(uid); 1409 if (getuid() != uid) { 1410 error("setuid failed"); 1411 exit(1); 1412 } 1413 setgid(getgid()); 1414 execl("/bin/sh", "sh", "-c", program, (char *)0); 1415 error("could not exec /bin/sh: %m"); 1416 exit(99); 1417 /* NOTREACHED */ 1418} 1419 1420 1421/* 1422 * run-program - execute a program with given arguments, 1423 * but don't wait for it. 1424 * If the program can't be executed, logs an error unless 1425 * must_exist is 0 and the program file doesn't exist. 1426 * Returns -1 if it couldn't fork, 0 if the file doesn't exist 1427 * or isn't an executable plain file, or the process ID of the child. 1428 * If done != NULL, (*done)(arg) will be called later (within 1429 * reap_kids) iff the return value is > 0. 1430 */ 1431pid_t 1432run_program(prog, args, must_exist, done, arg) 1433 char *prog; 1434 char **args; 1435 int must_exist; 1436 void (*done) __P((void *)); 1437 void *arg; 1438{ 1439 int pid; 1440 struct stat sbuf; 1441 1442 /* 1443 * First check if the file exists and is executable. 1444 * We don't use access() because that would use the 1445 * real user-id, which might not be root, and the script 1446 * might be accessible only to root. 1447 */ 1448 errno = EINVAL; 1449 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) 1450 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { 1451 if (must_exist || errno != ENOENT) 1452 warn("Can't execute %s: %m", prog); 1453 return 0; 1454 } 1455 1456 pid = fork(); 1457 if (pid == -1) { 1458 error("Failed to create child process for %s: %m", prog); 1459 return -1; 1460 } 1461 if (pid == 0) { 1462 int new_fd; 1463 1464 /* Leave the current location */ 1465 (void) setsid(); /* No controlling tty. */ 1466 (void) umask (S_IRWXG|S_IRWXO); 1467 (void) chdir ("/"); /* no current directory. */ 1468 setuid(0); /* set real UID = root */ 1469 setgid(getegid()); 1470 1471 /* Ensure that nothing of our device environment is inherited. */ 1472 sys_close(); 1473 closelog(); 1474 close (0); 1475 close (1); 1476 close (2); 1477 if (the_channel->close) 1478 (*the_channel->close)(); 1479 1480 /* Don't pass handles to the PPP device, even by accident. */ 1481 new_fd = open (_PATH_DEVNULL, O_RDWR); 1482 if (new_fd >= 0) { 1483 if (new_fd != 0) { 1484 dup2 (new_fd, 0); /* stdin <- /dev/null */ 1485 close (new_fd); 1486 } 1487 dup2 (0, 1); /* stdout -> /dev/null */ 1488 dup2 (0, 2); /* stderr -> /dev/null */ 1489 } 1490 1491#ifdef BSD 1492 /* Force the priority back to zero if pppd is running higher. */ 1493 if (setpriority (PRIO_PROCESS, 0, 0) < 0) 1494 warn("can't reset priority to 0: %m"); 1495#endif 1496 1497 /* SysV recommends a second fork at this point. */ 1498 1499 /* run the program */ 1500 execve(prog, args, script_env); 1501 if (must_exist || errno != ENOENT) { 1502 /* have to reopen the log, there's nowhere else 1503 for the message to go. */ 1504 reopen_log(); 1505 syslog(LOG_ERR, "Can't execute %s: %m", prog); 1506 closelog(); 1507 } 1508 _exit(-1); 1509 } 1510 1511 if (debug) 1512 dbglog("Script %s started (pid %d)", prog, pid); 1513 record_child(pid, prog, done, arg); 1514 1515 return pid; 1516} 1517 1518 1519/* 1520 * record_child - add a child process to the list for reap_kids 1521 * to use. 1522 */ 1523void 1524record_child(pid, prog, done, arg) 1525 int pid; 1526 char *prog; 1527 void (*done) __P((void *)); 1528 void *arg; 1529{ 1530 struct subprocess *chp; 1531 1532 ++n_children; 1533 1534 chp = (struct subprocess *) malloc(sizeof(struct subprocess)); 1535 if (chp == NULL) { 1536 warn("losing track of %s process", prog); 1537 } else { 1538 chp->pid = pid; 1539 chp->prog = prog; 1540 chp->done = done; 1541 chp->arg = arg; 1542 chp->next = children; 1543 children = chp; 1544 } 1545} 1546 1547 1548/* 1549 * reap_kids - get status from any dead child processes, 1550 * and log a message for abnormal terminations. 1551 */ 1552static int 1553reap_kids(waitfor) 1554 int waitfor; 1555{ 1556 int pid, status; 1557 struct subprocess *chp, **prevp; 1558 1559 if (n_children == 0) 1560 return 0; 1561 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1 1562 && pid != 0) { 1563 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { 1564 if (chp->pid == pid) { 1565 --n_children; 1566 *prevp = chp->next; 1567 break; 1568 } 1569 } 1570 if (WIFSIGNALED(status)) { 1571 warn("Child process %s (pid %d) terminated with signal %d", 1572 (chp? chp->prog: "??"), pid, WTERMSIG(status)); 1573 } else if (debug) 1574 dbglog("Script %s finished (pid %d), status = 0x%x", 1575 (chp? chp->prog: "??"), pid, status); 1576 if (chp && chp->done) 1577 (*chp->done)(chp->arg); 1578 if (chp) 1579 free(chp); 1580 } 1581 if (pid == -1) { 1582 if (errno == ECHILD) 1583 return -1; 1584 if (errno != EINTR) 1585 error("Error waiting for child process: %m"); 1586 } 1587 return 0; 1588} 1589 1590/* 1591 * add_notifier - add a new function to be called when something happens. 1592 */ 1593void 1594add_notifier(notif, func, arg) 1595 struct notifier **notif; 1596 notify_func func; 1597 void *arg; 1598{ 1599 struct notifier *np; 1600 1601 np = malloc(sizeof(struct notifier)); 1602 if (np == 0) 1603 novm("notifier struct"); 1604 np->next = *notif; 1605 np->func = func; 1606 np->arg = arg; 1607 *notif = np; 1608} 1609 1610/* 1611 * remove_notifier - remove a function from the list of things to 1612 * be called when something happens. 1613 */ 1614void 1615remove_notifier(notif, func, arg) 1616 struct notifier **notif; 1617 notify_func func; 1618 void *arg; 1619{ 1620 struct notifier *np; 1621 1622 for (; (np = *notif) != 0; notif = &np->next) { 1623 if (np->func == func && np->arg == arg) { 1624 *notif = np->next; 1625 free(np); 1626 break; 1627 } 1628 } 1629} 1630 1631/* 1632 * notify - call a set of functions registered with add_notify. 1633 */ 1634void 1635notify(notif, val) 1636 struct notifier *notif; 1637 int val; 1638{ 1639 struct notifier *np; 1640 1641 while ((np = notif) != 0) { 1642 notif = np->next; 1643 (*np->func)(np->arg, val); 1644 } 1645} 1646 1647/* 1648 * novm - log an error message saying we ran out of memory, and die. 1649 */ 1650void 1651novm(msg) 1652 char *msg; 1653{ 1654 fatal("Virtual memory exhausted allocating %s\n", msg); 1655} 1656 1657/* 1658 * script_setenv - set an environment variable value to be used 1659 * for scripts that we run (e.g. ip-up, auth-up, etc.) 1660 */ 1661void 1662script_setenv(var, value, iskey) 1663 char *var, *value; 1664 int iskey; 1665{ 1666 size_t varl = strlen(var); 1667 size_t vl = varl + strlen(value) + 2; 1668 int i; 1669 char *p, *newstring; 1670 1671 newstring = (char *) malloc(vl+1); 1672 if (newstring == 0) 1673 return; 1674 *newstring++ = iskey; 1675 slprintf(newstring, vl, "%s=%s", var, value); 1676 1677 /* check if this variable is already set */ 1678 if (script_env != 0) { 1679 for (i = 0; (p = script_env[i]) != 0; ++i) { 1680 if (strncmp(p, var, varl) == 0 && p[varl] == '=') { 1681 if (p[-1] && pppdb != NULL) 1682 delete_db_key(p); 1683 free(p-1); 1684 script_env[i] = newstring; 1685 if (iskey && pppdb != NULL) 1686 add_db_key(newstring); 1687 update_db_entry(); 1688 return; 1689 } 1690 } 1691 } else { 1692 /* no space allocated for script env. ptrs. yet */ 1693 i = 0; 1694 script_env = (char **) malloc(16 * sizeof(char *)); 1695 if (script_env == 0) 1696 return; 1697 s_env_nalloc = 16; 1698 } 1699 1700 /* reallocate script_env with more space if needed */ 1701 if (i + 1 >= s_env_nalloc) { 1702 int new_n = i + 17; 1703 char **newenv = (char **) realloc((void *)script_env, 1704 new_n * sizeof(char *)); 1705 if (newenv == 0) 1706 return; 1707 script_env = newenv; 1708 s_env_nalloc = new_n; 1709 } 1710 1711 script_env[i] = newstring; 1712 script_env[i+1] = 0; 1713 1714 if (pppdb != NULL) { 1715 if (iskey) 1716 add_db_key(newstring); 1717 update_db_entry(); 1718 } 1719} 1720 1721/* 1722 * script_unsetenv - remove a variable from the environment 1723 * for scripts. 1724 */ 1725void 1726script_unsetenv(var) 1727 char *var; 1728{ 1729 int vl = strlen(var); 1730 int i; 1731 char *p; 1732 1733 if (script_env == 0) 1734 return; 1735 for (i = 0; (p = script_env[i]) != 0; ++i) { 1736 if (strncmp(p, var, vl) == 0 && p[vl] == '=') { 1737 if (p[-1] && pppdb != NULL) 1738 delete_db_key(p); 1739 free(p-1); 1740 while ((script_env[i] = script_env[i+1]) != 0) 1741 ++i; 1742 break; 1743 } 1744 } 1745 if (pppdb != NULL) 1746 update_db_entry(); 1747} 1748 1749/* 1750 * update_db_entry - update our entry in the database. 1751 */ 1752static void 1753update_db_entry() 1754{ 1755 TDB_DATA key, dbuf; 1756 int vlen, i; 1757 char *p, *q, *vbuf; 1758 1759 if (script_env == NULL) 1760 return; 1761 vlen = 0; 1762 for (i = 0; (p = script_env[i]) != 0; ++i) 1763 vlen += strlen(p) + 1; 1764 vbuf = malloc(vlen); 1765 if (vbuf == 0) 1766 novm("database entry"); 1767 q = vbuf; 1768 for (i = 0; (p = script_env[i]) != 0; ++i) 1769 q += slprintf(q, vbuf + vlen - q, "%s;", p); 1770 1771 key.dptr = db_key; 1772 key.dsize = strlen(db_key); 1773 dbuf.dptr = vbuf; 1774 dbuf.dsize = vlen; 1775 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 1776 error("tdb_store failed: %s", tdb_error(pppdb)); 1777 1778} 1779 1780/* 1781 * add_db_key - add a key that we can use to look up our database entry. 1782 */ 1783static void 1784add_db_key(str) 1785 const char *str; 1786{ 1787 TDB_DATA key, dbuf; 1788 1789 key.dptr = (char *) str; 1790 key.dsize = strlen(str); 1791 dbuf.dptr = db_key; 1792 dbuf.dsize = strlen(db_key); 1793 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) 1794 error("tdb_store key failed: %s", tdb_error(pppdb)); 1795} 1796 1797/* 1798 * delete_db_key - delete a key for looking up our database entry. 1799 */ 1800static void 1801delete_db_key(str) 1802 const char *str; 1803{ 1804 TDB_DATA key; 1805 1806 key.dptr = (char *) str; 1807 key.dsize = strlen(str); 1808 tdb_delete(pppdb, key); 1809} 1810 1811/* 1812 * cleanup_db - delete all the entries we put in the database. 1813 */ 1814static void 1815cleanup_db() 1816{ 1817 TDB_DATA key; 1818 int i; 1819 char *p; 1820 1821 key.dptr = db_key; 1822 key.dsize = strlen(db_key); 1823 tdb_delete(pppdb, key); 1824 for (i = 0; (p = script_env[i]) != 0; ++i) 1825 if (p[-1]) 1826 delete_db_key(p); 1827} 1828