release/src/router/ppp/pppoecd/main.c

   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 1.7 2004/08/12 02:56:55 tallest 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
  58 #ifdef CBCP_SUPPORT
  59 #include "cbcp.h"
  60 #endif
  61
  62 #ifdef IPX_CHANGE
  63 #include "ipxcp.h"
  64 #endif /* IPX_CHANGE */
  65 #ifdef AT_CHANGE
  66 #include "atcp.h"
  67 #endif
  68
  69 static const char rcsid[] = RCSID;
  70
  71 /* interface vars */
  72 char ifname[32];                /* Interface name */
  73 int ifunit;                     /* Interface unit number */
  74 int dial_cnt;
  75
  76 struct channel *the_channel;
  77
  78 char *progname;                 /* Name of this program */
  79 char hostname[MAXNAMELEN];      /* Our hostname */
  80 static char pidfilename[MAXPATHLEN];    /* name of pid file */
  81 static char linkpidfile[MAXPATHLEN];    /* name of linkname pid file */
  82 char ppp_devnam[MAXPATHLEN];    /* name of PPP tty (maybe ttypx) */
  83 uid_t uid;                      /* Our real user-id */
  84
  85 int hungup;                     /* terminal has been hung up */
  86 int privileged;                 /* we're running as real uid root */
  87 int need_holdoff;               /* need holdoff period before restarting */
  88 int detached;                   /* have detached from terminal */
  89 volatile int status;            /* exit status for pppd */
  90 int unsuccess;                  /* # unsuccessful connection attempts */
  91 int do_callback;                /* != 0 if we should do callback next */
  92 int doing_callback;             /* != 0 if we are doing callback */
  93 #define pppdb NULL
  94
  95 //      int (*holdoff_hook) __P((void)) = NULL;
  96 int (*new_phase_hook) __P((int)) = NULL;
  97
  98 static int conn_running;        /* we have a [dis]connector running */
  99 static int devfd;               /* fd of underlying device */
 100 static int fd_ppp = -1;         /* fd for talking PPP */
 101 static int fd_loop;             /* fd for getting demand-dial packets */
 102
 103 int phase;                      /* where the link is at */
 104 int kill_link;
 105 int open_ccp_flag;
 106 int listen_time;
 107 int got_sigusr2;
 108 int got_sigterm;
 109 int got_sighup;
 110
 111 static int waiting;
 112 static sigjmp_buf sigjmp;
 113
 114 char **script_env;              /* Env. variable values for scripts */
 115 int s_env_nalloc;               /* # words avail at script_env */
 116
 117 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
 118 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
 119
 120 static int n_children;          /* # child processes still running */
 121 static int got_sigchld;         /* set if we have received a SIGCHLD */
 122
 123 int privopen;                   /* don't lock, open device as root */
 124
 125 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
 126
 127 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
 128 int ngroups;                    /* How many groups valid in groups */
 129
 130 static struct timeval start_time;       /* Time when link was started. */
 131
 132 struct pppd_stats link_stats;
 133 int link_connect_time;
 134 int link_stats_valid;
 135
 136 const char pppoe_disc_file[] = "/var/lib/misc/pppoe-disc";
 137
 138
 139 /*
 140  * We maintain a list of child process pids and
 141  * functions to call when they exit.
 142  */
 143 struct subprocess {
 144     pid_t       pid;
 145     char        *prog;
 146     void        (*done) __P((void *));
 147     void        *arg;
 148     struct subprocess *next;
 149 };
 150
 151 static struct subprocess *children;
 152
 153 /* Prototypes for procedures local to this file. */
 154
 155 static void setup_signals __P((void));
 156 static void create_pidfile __P((void));
 157 static void create_linkpidfile __P((void));
 158 static void cleanup __P((void));
 159 static void get_input __P((void));
 160 static void calltimeout __P((void));
 161 static struct timeval *timeleft __P((struct timeval *));
 162 static void kill_my_pg __P((int));
 163 static void hup __P((int));
 164 static void term __P((int));
 165 static void chld __P((int));
 166 static void toggle_debug __P((int));
 167 static void open_ccp __P((int));
 168 static void bad_signal __P((int));
 169 static void holdoff_end __P((void *));
 170 static int reap_kids __P((int waitfor));
 171 #define update_db_entry()
 172 #define add_db_key(a)
 173 #define delete_db_key(a)
 174 #define cleanup_db()
 175 static void handle_events __P((void));
 176
 177 extern  char    *ttyname __P((int));
 178 extern  char    *getlogin __P((void));
 179 int main __P((int, char *[]));
 180
 181 extern void prng_init();        // random.c
 182
 183
 184 #ifdef ultrix
 185 #undef  O_NONBLOCK
 186 #define O_NONBLOCK      O_NDELAY
 187 #endif
 188
 189 #ifdef ULTRIX
 190 #define setlogmask(x)
 191 #endif
 192
 193 /*
 194  * PPP Data Link Layer "protocol" table.
 195  * One entry per supported protocol.
 196  * The last entry must be NULL.
 197  */
 198 struct protent *protocols[] = {
 199     &lcp_protent,
 200     &pap_protent,
 201 #ifdef CHAP_SUPPORT
 202     &chap_protent,
 203 #endif
 204     &ipcp_protent,
 205 #ifdef INET6
 206     &ipv6cp_protent,
 207 #endif
 208 #ifdef CCP_SUPPORT
 209     &ccp_protent,
 210 #endif
 211     NULL
 212 };
 213
 214 /*
 215  * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
 216  */
 217 #if !defined(PPP_DRV_NAME)
 218 #define PPP_DRV_NAME    "ppp"
 219 #endif /* !defined(PPP_DRV_NAME) */
 220
 221 extern int retransmit_time;
 222 extern int redial_immediately;
 223
 224 /*
 225 int debug_exist(const char *name)
 226 {
 227         struct stat st;
 228         return (stat(name, &st) == 0);
 229 }
 230 */
 231
 232 int
 233 main(argc, argv)
 234     int argc;
 235     char *argv[];
 236 {
 237     int i, t;
 238     char *p;
 239     struct passwd *pw;
 240     struct protent *protp;
 241     char numbuf[16];
 242
 243     new_phase(PHASE_INITIALIZE);
 244
 245     /*
 246      * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
 247      * This way we can close 0, 1, 2 in detach() without clobbering
 248      * a fd that we are using.
 249      */
 250     if ((i = open("/dev/null", O_RDWR)) >= 0) {
 251                 while (0 <= i && i <= 2)
 252                     i = dup(i);
 253                 if (i >= 0)
 254                     close(i);
 255     }
 256
 257     script_env = NULL;
 258
 259     /* Initialize syslog facilities */
 260     //reopen_log();
 261
 262     if (gethostname(hostname, MAXNAMELEN) < 0 ) {
 263                 LOGX_ERROR("Couldn't get hostname");
 264                 option_error("Couldn't get hostname: %m");
 265                 exit(1);
 266     }
 267     hostname[MAXNAMELEN-1] = 0;
 268
 269     /* make sure we don't create world or group writable files. */
 270     umask(umask(0777) | 022);
 271
 272     uid = getuid();
 273     privileged = uid == 0;
 274     slprintf(numbuf, sizeof(numbuf), "%d", uid);
 275     script_setenv("ORIG_UID", numbuf, 0);
 276
 277     ngroups = getgroups(NGROUPS_MAX, groups);
 278
 279     /*
 280      * Initialize magic number generator now so that protocols may
 281      * use magic numbers in initialization.
 282      */
 283     magic_init();
 284
 285     /*
 286      * Initialize each protocol.
 287      */
 288     for (i = 0; (protp = protocols[i]) != NULL; ++i)
 289         (*protp->init)(0);
 290
 291     progname = *argv;
 292
 293     /*
 294      * Parse, in order, the system options file, the user's options file,
 295      * and the command line arguments.
 296      */
 297
 298     if (!parse_args(argc, argv))
 299                 exit(EXIT_OPTION_ERROR);
 300     devnam_fixed = 1;           /* can no longer change device name */
 301
 302     reopen_log();       // According to ipparam value, decide log name
 303
 304     /*
 305      * Work out the device name, if it hasn't already been specified,
 306      * and parse the tty's options file.
 307      */
 308     if (the_channel->process_extra_options)
 309                 (*the_channel->process_extra_options)();
 310
 311     if (debug)
 312                 setlogmask(LOG_UPTO(LOG_DEBUG));
 313
 314     /*
 315      * Check that we are running as root.
 316      */
 317     if (geteuid() != 0) {
 318                 option_error("must be root to run %s, since it is not setuid-root",
 319                              argv[0]);
 320                 exit(EXIT_NOT_ROOT);
 321     }
 322
 323     if (!ppp_available()) {
 324                 option_error("%s", no_ppp_msg);
 325                 exit(EXIT_NO_KERNEL_SUPPORT);
 326     }
 327
 328     /*
 329      * Check that the options given are valid and consistent.
 330      */
 331     check_options();
 332     if (!sys_check_options())
 333                 exit(EXIT_OPTION_ERROR);
 334     auth_check_options();
 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         /*
 356          * Initialize random seed.
 357          */
 358         prng_init();
 359
 360     /*
 361      * Detach ourselves from the terminal, if required,
 362      * and identify who is running us.
 363      */
 364     if (!nodetach && !updetach)
 365                 detach();
 366     p = getlogin();
 367     if (p == NULL) {
 368         pw = getpwuid(uid);
 369         if (pw != NULL && pw->pw_name != NULL)
 370             p = pw->pw_name;
 371         else
 372             p = "(unknown)";
 373     }
 374
 375         LOGX_INFO("Starting");
 376         LOGX_DEBUG("demand=%d", demand);
 377
 378     script_setenv("PPPLOGNAME", p, 0);
 379
 380     if (devnam[0])
 381                 script_setenv("DEVICE", devnam, 1);
 382     slprintf(numbuf, sizeof(numbuf), "%d", getpid());
 383     script_setenv("PPPD_PID", numbuf, 1);
 384
 385     setup_signals();
 386
 387     waiting = 0;
 388
 389     create_linkpidfile();
 390
 391     /*
 392      * If we're doing dial-on-demand, set up the interface now.
 393      */
 394     if (demand) {
 395                 /*
 396                  * Open the loopback channel and set it up to be the ppp interface.
 397                  */
 398                 fd_loop = open_ppp_loopback();
 399                 set_ifunit(1);
 400
 401                 /*
 402                  * Configure the interface and mark it up, etc.
 403                  */
 404                 demand_conf();
 405     }
 406
 407     do_callback = 0;
 408
 409         dial_cnt = 0;
 410     for (;;) {  // ##1
 411
 412                 listen_time = 0;
 413                 need_holdoff = 1;
 414                 devfd = -1;
 415                 status = EXIT_OK;
 416                 ++unsuccess;
 417                 doing_callback = do_callback;
 418                 do_callback = 0;
 419
 420                 if (demand && !doing_callback) {
 421                     /*
 422                      * Don't do anything until we see some activity.
 423                      */
 424                         LOGX_DEBUG("%s: PHASE_DORMANT", __FUNCTION__);
 425                     new_phase(PHASE_DORMANT);
 426                     demand_unblock();
 427                     add_fd(fd_loop);
 428                     for (;;) {  // ##2
 429                                 handle_events();
 430                                 if (kill_link && !persist)
 431                                     break;
 432                                 if (get_loop_output()) {
 433                                     break;
 434                             }
 435                     }   // for (;;) ##2
 436                     remove_fd(fd_loop);
 437                     if (kill_link && !persist) {
 438                                 LOGX_DEBUG("%s: (kill_link && !persist)", __FUNCTION__);
 439                                 break;
 440                         }
 441
 442                     /*
 443                      * Now we want to bring up the link.
 444                      */
 445                     demand_block();
 446                     info("Starting link");
 447                 }       // if (demand && !doing_callback)
 448
 449                 new_phase(PHASE_SERIALCONN);
 450
 451                 devfd = the_channel->connect();
 452                 LOGX_DEBUG("%s: the_channel->connect()=%d", __FUNCTION__, devfd);
 453                 if (devfd < 0) {
 454                         redial_immediately = 0;
 455                     continue;
 456                 }
 457
 458                 /* set up the serial device as a ppp interface */
 459                 fd_ppp = the_channel->establish_ppp(devfd);
 460                 LOGX_DEBUG("%s: the_channel->establish_ppp()=%d", __FUNCTION__, fd_ppp);
 461                 if (fd_ppp < 0) {
 462                     status = EXIT_FATAL_ERROR;
 463                     goto disconnect;
 464                 }
 465
 466                 if (!demand && ifunit >= 0)
 467                     set_ifunit(1);
 468
 469                 /*
 470                  * Start opening the connection and wait for
 471                  * incoming events (reply, timeout, etc.).
 472                  */
 473                 notice("Connect: %s <--> %s", ifname, ppp_devnam);
 474                 my_gettimeofday(&start_time, NULL);
 475                 link_stats_valid = 0;
 476                 script_unsetenv("CONNECT_TIME");
 477                 script_unsetenv("BYTES_SENT");
 478                 script_unsetenv("BYTES_RCVD");
 479                 lcp_lowerup(0);
 480
 481                 add_fd(fd_ppp);
 482                 lcp_open(0);            /* Start protocol */
 483                 status = EXIT_NEGOTIATION_FAILED;
 484                 new_phase(PHASE_ESTABLISH);
 485                 while (phase != PHASE_DEAD) {
 486                     handle_events();
 487                     get_input();
 488                     if (kill_link)
 489                                 lcp_close(0, "User request");
 490 #ifdef CCP_SUPPORT
 491                         if (open_ccp_flag) {
 492                                 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
 493                                         ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
 494                                         (*ccp_protent.open)(0);
 495                                 }
 496                         }
 497 #endif
 498                 }       // while (phase != PHASE_DEAD)
 499
 500                 LOGX_DEBUG("%s: phase == PHASE_DEAD", __FUNCTION__);
 501
 502                 /*
 503                  * Print connect time and statistics.
 504                  */
 505                 LOGX_NOTICE("Disconnected.");
 506                 if (link_stats_valid) {
 507                     int tt = (link_connect_time + 5) / 6;    /* 1/10ths of minutes */
 508                     LOGX_NOTICE("Connect time %d.%d minutes.", tt / 10, tt % 10);
 509                     LOGX_NOTICE("Sent %u bytes, received %u bytes.", link_stats.bytes_out, link_stats.bytes_in);
 510                 }
 511
 512                 /*
 513                  * Delete pid file before disestablishing ppp.  Otherwise it
 514                  * can happen that another pppd gets the same unit and then
 515                  * we delete its pid file.
 516                  */
 517                 if (!demand) {
 518                     if (pidfilename[0] != 0
 519                                 && unlink(pidfilename) < 0 && errno != ENOENT)
 520                                         warn("unable to delete pid file %s: %m", pidfilename);
 521                     pidfilename[0] = 0;
 522                 }
 523
 524                 /*
 525                  * If we may want to bring the link up again, transfer
 526                  * the ppp unit back to the loopback.  Set the
 527                  * real serial device back to its normal mode of operation.
 528                  */
 529                 remove_fd(fd_ppp);
 530                 clean_check();
 531                 the_channel->disestablish_ppp(devfd);
 532                 fd_ppp = -1;
 533                 if (!hungup)
 534                     lcp_lowerdown(0);
 535                 if (!demand)
 536                     script_unsetenv("IFNAME");
 537
 538 disconnect:
 539                 LOGX_DEBUG("%s: disconnect", __FUNCTION__);
 540
 541                 if (!demand) {
 542                         sys_cleanup();
 543                 }
 544
 545                 new_phase(PHASE_DISCONNECT);
 546                 the_channel->disconnect();
 547
 548                 if (the_channel->cleanup)
 549                     (*the_channel->cleanup)();
 550
 551                 if (!demand) {
 552                     if (pidfilename[0] != 0
 553                                 && unlink(pidfilename) < 0 && errno != ENOENT)
 554                                         warn("unable to delete pid file %s: %m", pidfilename);
 555                     pidfilename[0] = 0;
 556                 }
 557
 558                 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
 559                     break;
 560                 if (demand)
 561                     demand_discard();
 562
 563                 if (need_holdoff) {
 564                         LOGX_DEBUG("%s: redial_immediately=%d", __FUNCTION__, redial_immediately);
 565
 566                         /***************************************
 567                          * modify by tanghui 2006-03-28
 568                          * first 3 time set to 15 sec
 569                          * after that, should try to redial randomly
 570                          * FIXME: has send a PADI before HOLDOFF so, (3 - 1)
 571                          ***************************************/
 572                         if (!redial_immediately)
 573                         {
 574                                 if(!idle_time_limit)
 575                                 {
 576                                         if(dial_cnt < 3)
 577                                         {
 578                                                 holdoff = 10;
 579                                         }
 580                                         else
 581                                         {
 582                                                 holdoff = (int)(3 + (((retransmit_time - 3.0) * rand())/ (RAND_MAX + 1.0)));
 583                                                 if((holdoff > 93) && (holdoff > retransmit_time - 90))
 584                                                 {
 585                                                         holdoff -= 90;
 586                                                 }
 587                                                 //holdoff = 3 + gen_random_int(retransmit_time - 3);
 588                                         }
 589                                 }
 590                                 else
 591                                 {
 592                                         holdoff = 10;
 593                                 }
 594                                 t = holdoff;
 595                         }
 596                         else
 597                         {
 598                                 t = 10; //modified from 0 to 10 //by crazy 20070508
 599                                 redial_immediately = 0;
 600                         }
 601
 602                         LOGX_DEBUG("%s: t=%d", __FUNCTION__, t);
 603
 604                         if (t > 0) {
 605                             new_phase(PHASE_HOLDOFF);
 606                             TIMEOUT(holdoff_end, NULL, t);
 607                             do {
 608                                         handle_events();
 609                                         if (kill_link)
 610                                             new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
 611                                 } while (phase == PHASE_HOLDOFF);
 612                             if (!persist)
 613                                         break;
 614                         }
 615                 }       // need_holdoff
 616                 else {
 617                         LOGX_DEBUG("%s: !need_holdoff", __FUNCTION__);
 618                 }
 619     }   // for(;;)      ##1
 620
 621     /* Wait for scripts to finish */
 622     while (n_children > 0) {
 623         if (debug) {
 624             struct subprocess *chp;
 625             dbglog("Waiting for %d child processes...", n_children);
 626             for (chp = children; chp != NULL; chp = chp->next)
 627                 dbglog("  script %s, pid %d", chp->prog, chp->pid);
 628         }
 629         if (reap_kids(1) < 0)
 630             break;
 631     }
 632
 633     die(status);
 634     return 0;
 635 }
 636
 637 /*
 638  * handle_events - wait for something to happen and respond to it.
 639  */
 640 static void
 641 handle_events()
 642 {
 643     struct timeval timo;
 644     sigset_t mask;
 645
 646     kill_link = open_ccp_flag = 0;
 647     if (sigsetjmp(sigjmp, 1) == 0) {
 648         sigprocmask(SIG_BLOCK, &mask, NULL);
 649         if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
 650             sigprocmask(SIG_UNBLOCK, &mask, NULL);
 651         } else {
 652             waiting = 1;
 653             sigprocmask(SIG_UNBLOCK, &mask, NULL);
 654             wait_input(timeleft(&timo));
 655         }
 656     }
 657     waiting = 0;
 658     calltimeout();
 659     if (got_sighup) {
 660         kill_link = 1;
 661         got_sighup = 0;
 662         if (status != EXIT_HANGUP)
 663             status = EXIT_USER_REQUEST;
 664     }
 665     if (got_sigterm) {
 666         kill_link = 1;
 667 #if 1   // zzz
 668         persist = 0;
 669 #else
 670         /*
 671          * remove by tanghui @ 2006-03-31
 672          * don't terminate the process
 673          */
 674         //persist = 0;
 675         /*****************************/
 676 #endif
 677         status = EXIT_USER_REQUEST;
 678         got_sigterm = 0;
 679     }
 680     if (got_sigchld) {
 681         reap_kids(0);   /* Don't leave dead kids lying around */
 682         got_sigchld = 0;
 683     }
 684     if (got_sigusr2) {
 685         open_ccp_flag = 1;
 686         got_sigusr2 = 0;
 687     }
 688 }
 689
 690 /*
 691  * setup_signals - initialize signal handling.
 692  */
 693 static void
 694 setup_signals()
 695 {
 696     struct sigaction sa;
 697     sigset_t mask;
 698
 699     /*
 700      * Compute mask of all interesting signals and install signal handlers
 701      * for each.  Only one signal handler may be active at a time.  Therefore,
 702      * all other signals should be masked when any handler is executing.
 703      */
 704     sigemptyset(&mask);
 705     sigaddset(&mask, SIGHUP);
 706     sigaddset(&mask, SIGINT);
 707     sigaddset(&mask, SIGTERM);
 708     sigaddset(&mask, SIGCHLD);
 709     sigaddset(&mask, SIGUSR2);
 710
 711 #define SIGNAL(s, handler)      do { \
 712         sa.sa_handler = handler; \
 713         if (sigaction(s, &sa, NULL) < 0) \
 714             fatal("Couldn't establish signal handler (%d): %m", s); \
 715     } while (0)
 716
 717     sa.sa_mask = mask;
 718     sa.sa_flags = 0;
 719     SIGNAL(SIGHUP, hup);                /* Hangup */
 720     SIGNAL(SIGINT, term);               /* Interrupt */
 721     SIGNAL(SIGTERM, term);              /* Terminate */
 722     SIGNAL(SIGCHLD, chld);
 723
 724     SIGNAL(SIGUSR1, toggle_debug);      /* Toggle debug flag */
 725     SIGNAL(SIGUSR2, open_ccp);          /* Reopen CCP */
 726
 727     /*
 728      * Install a handler for other signals which would otherwise
 729      * cause pppd to exit without cleaning up.
 730      */
 731     SIGNAL(SIGABRT, bad_signal);
 732     SIGNAL(SIGALRM, bad_signal);
 733     SIGNAL(SIGFPE, bad_signal);
 734     SIGNAL(SIGILL, bad_signal);
 735     SIGNAL(SIGPIPE, bad_signal);
 736     SIGNAL(SIGQUIT, bad_signal);
 737     SIGNAL(SIGSEGV, bad_signal);
 738 #ifdef SIGBUS
 739     SIGNAL(SIGBUS, bad_signal);
 740 #endif
 741 #ifdef SIGEMT
 742     SIGNAL(SIGEMT, bad_signal);
 743 #endif
 744 #ifdef SIGPOLL
 745     SIGNAL(SIGPOLL, bad_signal);
 746 #endif
 747 #ifdef SIGPROF
 748     SIGNAL(SIGPROF, bad_signal);
 749 #endif
 750 #ifdef SIGSYS
 751     SIGNAL(SIGSYS, bad_signal);
 752 #endif
 753 #ifdef SIGTRAP
 754     SIGNAL(SIGTRAP, bad_signal);
 755 #endif
 756 #ifdef SIGVTALRM
 757     SIGNAL(SIGVTALRM, bad_signal);
 758 #endif
 759 #ifdef SIGXCPU
 760     SIGNAL(SIGXCPU, bad_signal);
 761 #endif
 762 #ifdef SIGXFSZ
 763     SIGNAL(SIGXFSZ, bad_signal);
 764 #endif
 765
 766     /*
 767      * Apparently we can get a SIGPIPE when we call syslog, if
 768      * syslogd has died and been restarted.  Ignoring it seems
 769      * be sufficient.
 770      */
 771     signal(SIGPIPE, SIG_IGN);
 772 }
 773
 774 /*
 775  * set_ifunit - do things we need to do once we know which ppp
 776  * unit we are using.
 777  */
 778 void
 779 set_ifunit(iskey)
 780     int iskey;
 781 {
 782     info("Using interface %s%d", PPP_DRV_NAME, ifunit);
 783     slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
 784     script_setenv("IFNAME", ifname, iskey);
 785
 786     char *arg[3]={_PATH_SETPPPOEPID, ipparam, NULL};  // tallest 1219
 787     run_program(_PATH_SETPPPOEPID,arg,0,0,0);
 788
 789     if (iskey) {
 790         create_pidfile();       /* write pid to file */
 791         create_linkpidfile();
 792     }
 793 }
 794
 795 /*
 796  * detach - detach us from the controlling terminal.
 797  */
 798 void
 799 detach()
 800 {
 801     int pid;
 802     char numbuf[16];
 803
 804     if (detached)
 805         return;
 806     if ((pid = fork()) < 0) {
 807         error("Couldn't detach (fork failed: %m)");
 808         die(1);                 /* or just return? */
 809     }
 810     if (pid != 0) {
 811         /* parent */
 812         exit(0);                /* parent dies */
 813     }
 814     setsid();
 815     chdir("/");
 816     close(0);
 817     close(1);
 818     close(2);
 819     detached = 1;
 820     if (log_default)
 821         log_to_fd = -1;
 822     /* update pid files if they have been written already */
 823     if (pidfilename[0])
 824         create_pidfile();
 825     if (linkpidfile[0])
 826         create_linkpidfile();
 827     slprintf(numbuf, sizeof(numbuf), "%d", getpid());
 828     script_setenv("PPPD_PID", numbuf, 1);
 829 }
 830
 831 /*
 832  * reopen_log - (re)open our connection to syslog.
 833  */
 834 void
 835 reopen_log()
 836 {
 837 #ifdef ULTRIX
 838     openlog("pppd", LOG_PID);
 839 #else
 840 #ifdef MPPPOE_SUPPORT
 841     if(!strncmp(ipparam, "0", 1))
 842         openlog("pppoe", LOG_PID | LOG_NDELAY, LOG_PPP);
 843     else
 844         openlog("pppoe-1", LOG_PID | LOG_NDELAY, LOG_PPP);
 845 #else
 846     openlog("pppoe", LOG_PID | LOG_NDELAY, LOG_PPP);
 847 #endif
 848     setlogmask(LOG_UPTO(logmask));
 849 #endif
 850 }
 851
 852 /*
 853  * Create a file containing our process ID.
 854  */
 855 static void
 856 create_pidfile()
 857 {
 858     FILE *pidfile;
 859
 860     slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
 861              _PATH_VARRUN, ifname);
 862     if ((pidfile = fopen(pidfilename, "w")) != NULL) {
 863         fprintf(pidfile, "%d\n", getpid());
 864         (void) fclose(pidfile);
 865     } else {
 866         error("Failed to create pid file %s: %m", pidfilename);
 867         pidfilename[0] = 0;
 868     }
 869 }
 870
 871 static void
 872 create_linkpidfile()
 873 {
 874     FILE *pidfile;
 875
 876     if (linkname[0] == 0)
 877         return;
 878     script_setenv("LINKNAME", linkname, 1);
 879     slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
 880              _PATH_VARRUN, linkname);
 881     if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
 882         fprintf(pidfile, "%d\n", getpid());
 883         if (ifname[0])
 884             fprintf(pidfile, "%s\n", ifname);
 885         (void) fclose(pidfile);
 886     } else {
 887         error("Failed to create pid file %s: %m", linkpidfile);
 888         linkpidfile[0] = 0;
 889     }
 890 }
 891
 892 /*
 893  * holdoff_end - called via a timeout when the holdoff period ends.
 894  */
 895 static void
 896 holdoff_end(arg)
 897     void *arg;
 898 {
 899     new_phase(PHASE_DORMANT);
 900 }
 901
 902 /*
 903  * get_input - called when incoming data is available.
 904  */
 905 static void
 906 get_input()
 907 {
 908     int len, i;
 909     u_char *p;
 910     u_short protocol;
 911     struct protent *protp;
 912
 913     p = inpacket_buf;   /* point to beginning of packet buffer */
 914
 915     len = read_packet(inpacket_buf);
 916     if (len < 0)
 917                 return;
 918
 919     if (len == 0) {
 920                 notice("Modem hangup");
 921                 hungup = 1;
 922                 status = EXIT_HANGUP;
 923                 lcp_lowerdown(0);       /* serial link is no longer available */
 924                 link_terminated(0);
 925                 return;
 926     }
 927
 928     if (debug /*&& (debugflags & DBG_INPACKET)*/)
 929                 dbglog("rcvd %P", p, len);
 930
 931     if (len < PPP_HDRLEN) {
 932                 MAINDEBUG(("io(): Received short packet."));
 933                 return;
 934     }
 935
 936     p += 2;                             /* Skip address and control */
 937     GETSHORT(protocol, p);
 938     len -= PPP_HDRLEN;
 939
 940     /*
 941      * Toss all non-LCP packets unless LCP is OPEN.
 942      */
 943     if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
 944                 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
 945                 return;
 946     }
 947
 948     /*
 949      * Until we get past the authentication phase, toss all packets
 950      * except LCP, LQR and authentication packets.
 951      */
 952     if (phase <= PHASE_AUTHENTICATE
 953                 && !(protocol == PPP_LCP || protocol == PPP_LQR
 954                      || protocol == PPP_PAP || protocol == PPP_CHAP)) {
 955                 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
 956                            protocol, phase));
 957                 return;
 958     }
 959
 960     /*
 961      * Upcall the proper protocol input routine.
 962      */
 963     for (i = 0; (protp = protocols[i]) != NULL; ++i) {
 964                 if (protp->protocol == protocol && protp->enabled_flag) {
 965                     (*protp->input)(0, p, len);
 966                     return;
 967                 }
 968                 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
 969                         && protp->datainput != NULL) {
 970                         (*protp->datainput)(0, p, len);
 971                         return;
 972                 }
 973     }
 974
 975     if (debug) {
 976                 warn("Unsupported protocol 0x%x received", protocol);
 977     }
 978     lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
 979 }
 980
 981 /*
 982  * new_phase - signal the start of a new phase of pppd's operation.
 983  */
 984 void
 985 new_phase(p)
 986     int p;
 987 {
 988     phase = p;
 989     if (new_phase_hook)
 990         (*new_phase_hook)(p);
 991 }
 992
 993 /*
 994  * die - clean up state and exit with the specified status.
 995  */
 996 void
 997 die(status)
 998     int status;
 999 {
1000     cleanup();
1001
1002         LOGX_INFO("Exiting");
1003     exit(status);
1004 }
1005
1006 /*
1007  * cleanup - restore anything which needs to be restored before we exit
1008  */
1009 /* ARGSUSED */
1010 static void
1011 cleanup()
1012 {
1013     sys_cleanup();
1014
1015     if (fd_ppp >= 0)
1016                 the_channel->disestablish_ppp(devfd);
1017     if (the_channel->cleanup)
1018                 (*the_channel->cleanup)();
1019
1020     if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1021                 warn("unable to delete pid file %s: %m", pidfilename);
1022     pidfilename[0] = 0;
1023     if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1024                 warn("unable to delete pid file %s: %m", linkpidfile);
1025     linkpidfile[0] = 0;
1026
1027         unlink(pppoe_disc_file);
1028 }
1029
1030 /*
1031  * update_link_stats - get stats at link termination.
1032  */
1033 void
1034 update_link_stats(u)
1035     int u;
1036 {
1037     struct timeval now;
1038     char numbuf[32];
1039
1040     if (!get_ppp_stats(u, &link_stats)
1041         || my_gettimeofday(&now, NULL) < 0)
1042         return;
1043     link_connect_time = now.tv_sec - start_time.tv_sec;
1044     link_stats_valid = 1;
1045
1046     slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1047     script_setenv("CONNECT_TIME", numbuf, 0);
1048     slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1049     script_setenv("BYTES_SENT", numbuf, 0);
1050     slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1051     script_setenv("BYTES_RCVD", numbuf, 0);
1052 }
1053
1054
1055 struct  callout {
1056     struct timeval      c_time;         /* time at which to call routine */
1057     void                *c_arg;         /* argument to routine */
1058     void                (*c_func) __P((void *)); /* routine */
1059     struct              callout *c_next;
1060 };
1061
1062 static struct callout *callout = NULL;  /* Callout list */
1063 static struct timeval timenow;          /* Current time */
1064
1065 /*
1066  * timeout - Schedule a timeout.
1067  *
1068  * Note that this timeout takes the number of milliseconds, NOT hz (as in
1069  * the kernel).
1070  */
1071 void
1072 timeout(func, arg, secs, usecs)
1073     void (*func) __P((void *));
1074     void *arg;
1075     int secs, usecs;
1076 {
1077     struct callout *newp, *p, **pp;
1078
1079     // Compiler error
1080     //MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1081     //         time / 1000, time % 1000));
1082
1083     /*
1084      * Allocate timeout.
1085      */
1086     if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1087         fatal("Out of memory in timeout()!");
1088     newp->c_arg = arg;
1089     newp->c_func = func;
1090     my_gettimeofday(&timenow, NULL);
1091     newp->c_time.tv_sec = timenow.tv_sec + secs;
1092     newp->c_time.tv_usec = timenow.tv_usec + usecs;
1093     if (newp->c_time.tv_usec >= 1000000) {
1094         newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1095         newp->c_time.tv_usec %= 1000000;
1096     }
1097
1098     /*
1099      * Find correct place and link it in.
1100      */
1101     for (pp = &callout; (p = *pp); pp = &p->c_next)
1102         if (newp->c_time.tv_sec < p->c_time.tv_sec
1103             || (newp->c_time.tv_sec == p->c_time.tv_sec
1104                 && newp->c_time.tv_usec < p->c_time.tv_usec))
1105             break;
1106     newp->c_next = p;
1107     *pp = newp;
1108 }
1109
1110
1111 /*
1112  * untimeout - Unschedule a timeout.
1113  */
1114 void
1115 untimeout(func, arg)
1116     void (*func) __P((void *));
1117     void *arg;
1118 {
1119     struct callout **copp, *freep;
1120
1121     MAINDEBUG(("Untimeout %p:%p.", func, arg));
1122
1123     /*
1124      * Find first matching timeout and remove it from the list.
1125      */
1126     for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1127         if (freep->c_func == func && freep->c_arg == arg) {
1128             *copp = freep->c_next;
1129             free((char *) freep);
1130             break;
1131         }
1132 }
1133
1134
1135 /*
1136  * calltimeout - Call any timeout routines which are now due.
1137  */
1138 static void
1139 calltimeout()
1140 {
1141     struct callout *p;
1142
1143     while (callout != NULL) {
1144         p = callout;
1145
1146         if (my_gettimeofday(&timenow, NULL) < 0)
1147             fatal("Failed to get time of day: %m");
1148         if (!(p->c_time.tv_sec < timenow.tv_sec
1149               || (p->c_time.tv_sec == timenow.tv_sec
1150                   && p->c_time.tv_usec <= timenow.tv_usec)))
1151             break;              /* no, it's not time yet */
1152
1153         callout = p->c_next;
1154         (*p->c_func)(p->c_arg);
1155
1156         free((char *) p);
1157     }
1158 }
1159
1160
1161 /*
1162  * timeleft - return the length of time until the next timeout is due.
1163  */
1164 static struct timeval *
1165 timeleft(tvp)
1166     struct timeval *tvp;
1167 {
1168     if (callout == NULL)
1169         return NULL;
1170
1171     my_gettimeofday(&timenow, NULL);
1172     tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1173     tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1174     if (tvp->tv_usec < 0) {
1175         tvp->tv_usec += 1000000;
1176         tvp->tv_sec -= 1;
1177     }
1178     if (tvp->tv_sec < 0)
1179         tvp->tv_sec = tvp->tv_usec = 0;
1180
1181     return tvp;
1182 }
1183
1184
1185 /*
1186  * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1187  */
1188 static void
1189 kill_my_pg(sig)
1190     int sig;
1191 {
1192     struct sigaction act, oldact;
1193
1194     act.sa_handler = SIG_IGN;
1195     act.sa_flags = 0;
1196     kill(0, sig);
1197     sigaction(sig, &act, &oldact);
1198     sigaction(sig, &oldact, NULL);
1199 }
1200
1201
1202 /*
1203  * hup - Catch SIGHUP signal.
1204  *
1205  * Indicates that the physical layer has been disconnected.
1206  * We don't rely on this indication; if the user has sent this
1207  * signal, we just take the link down.
1208  */
1209 static void
1210 hup(sig)
1211     int sig;
1212 {
1213     info("Hangup (SIGHUP)");
1214     got_sighup = 1;
1215     if (conn_running)
1216         /* Send the signal to the [dis]connector process(es) also */
1217         kill_my_pg(sig);
1218     if (waiting)
1219         siglongjmp(sigjmp, 1);
1220 }
1221
1222
1223 /*
1224  * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1225  *
1226  * Indicates that we should initiate a graceful disconnect and exit.
1227  */
1228 /*ARGSUSED*/
1229 static void
1230 term(sig)
1231     int sig;
1232 {
1233     info("Terminating on signal %d.", sig);
1234     got_sigterm = 1;
1235     if (conn_running)
1236         /* Send the signal to the [dis]connector process(es) also */
1237         kill_my_pg(sig);
1238     if (waiting)
1239         siglongjmp(sigjmp, 1);
1240 }
1241
1242
1243 /*
1244  * chld - Catch SIGCHLD signal.
1245  * Sets a flag so we will call reap_kids in the mainline.
1246  */
1247 static void
1248 chld(sig)
1249     int sig;
1250 {
1251     got_sigchld = 1;
1252     if (waiting)
1253         siglongjmp(sigjmp, 1);
1254 }
1255
1256
1257 /*
1258  * toggle_debug - Catch SIGUSR1 signal.
1259  *
1260  * Toggle debug flag.
1261  */
1262 static void toggle_debug(int sig)
1263 {
1264     debug = !debug;
1265         setlogmask(LOG_UPTO(debug ? LOG_DEBUG : logmask));
1266 }
1267
1268
1269 /*
1270  * open_ccp - Catch SIGUSR2 signal.
1271  *
1272  * Try to (re)negotiate compression.
1273  */
1274 /*ARGSUSED*/
1275 static void
1276 open_ccp(sig)
1277     int sig;
1278 {
1279     got_sigusr2 = 1;
1280     if (waiting)
1281         siglongjmp(sigjmp, 1);
1282 }
1283
1284
1285 /*
1286  * bad_signal - We've caught a fatal signal.  Clean up state and exit.
1287  */
1288 static void
1289 bad_signal(sig)
1290     int sig;
1291 {
1292     static int crashed = 0;
1293
1294     if (crashed)
1295         _exit(127);
1296     crashed = 1;
1297
1298         LOGX_ERROR("Fatal signal %d.", sig);
1299
1300     if (conn_running)
1301         kill_my_pg(SIGTERM);
1302     die(127);
1303 }
1304
1305 /*
1306  * run-program - execute a program with given arguments,
1307  * but don't wait for it.
1308  * If the program can't be executed, logs an error unless
1309  * must_exist is 0 and the program file doesn't exist.
1310  * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1311  * or isn't an executable plain file, or the process ID of the child.
1312  * If done != NULL, (*done)(arg) will be called later (within
1313  * reap_kids) iff the return value is > 0.
1314  */
1315 pid_t
1316 run_program(prog, args, must_exist, done, arg)
1317     char *prog;
1318     char **args;
1319     int must_exist;
1320     void (*done) __P((void *));
1321     void *arg;
1322 {
1323     int pid;
1324     struct stat sbuf;
1325
1326     /*
1327      * First check if the file exists and is executable.
1328      * We don't use access() because that would use the
1329      * real user-id, which might not be root, and the script
1330      * might be accessible only to root.
1331      */
1332     errno = EINVAL;
1333     if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1334         || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1335         if (must_exist || errno != ENOENT)
1336             warn("Can't execute %s: %m", prog);
1337         return 0;
1338     }
1339
1340     pid = fork();
1341     if (pid == -1) {
1342         error("Failed to create child process for %s: %m", prog);
1343         return -1;
1344     }
1345     if (pid == 0) {
1346         int new_fd;
1347
1348         /* Leave the current location */
1349         (void) setsid();        /* No controlling tty. */
1350         (void) umask (S_IRWXG|S_IRWXO);
1351         (void) chdir ("/");     /* no current directory. */
1352         setuid(0);              /* set real UID = root */
1353         setgid(getegid());
1354
1355         /* Ensure that nothing of our device environment is inherited. */
1356         sys_close();
1357         closelog();
1358         close (0);
1359         close (1);
1360         close (2);
1361         if (the_channel->close)
1362             (*the_channel->close)();
1363
1364         /* Don't pass handles to the PPP device, even by accident. */
1365         new_fd = open (_PATH_DEVNULL, O_RDWR);
1366         if (new_fd >= 0) {
1367             if (new_fd != 0) {
1368                 dup2  (new_fd, 0); /* stdin <- /dev/null */
1369                 close (new_fd);
1370             }
1371             dup2 (0, 1); /* stdout -> /dev/null */
1372             dup2 (0, 2); /* stderr -> /dev/null */
1373         }
1374
1375 #ifdef BSD
1376         /* Force the priority back to zero if pppd is running higher. */
1377         if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1378             warn("can't reset priority to 0: %m");
1379 #endif
1380
1381         /* SysV recommends a second fork at this point. */
1382
1383         /* run the program */
1384         execve(prog, args, script_env);
1385         if (must_exist || errno != ENOENT) {
1386             /* have to reopen the log, there's nowhere else
1387                for the message to go. */
1388             reopen_log();
1389             syslog(LOG_ERR, "Can't execute %s: %m", prog);
1390             closelog();
1391         }
1392         _exit(-1);
1393     }
1394
1395     if (debug)
1396         dbglog("Script %s started (pid %d)", prog, pid);
1397     record_child(pid, prog, done, arg);
1398     return pid;
1399 }
1400
1401
1402 /*
1403  * record_child - add a child process to the list for reap_kids
1404  * to use.
1405  */
1406 void
1407 record_child(pid, prog, done, arg)
1408     int pid;
1409     char *prog;
1410     void (*done) __P((void *));
1411     void *arg;
1412 {
1413     struct subprocess *chp;
1414
1415     ++n_children;
1416
1417     chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1418     if (chp == NULL) {
1419         warn("losing track of %s process", prog);
1420     } else {
1421         chp->pid = pid;
1422         chp->prog = prog;
1423         chp->done = done;
1424         chp->arg = arg;
1425         chp->next = children;
1426         children = chp;
1427     }
1428 }
1429
1430
1431 /*
1432  * reap_kids - get status from any dead child processes,
1433  * and log a message for abnormal terminations.
1434  */
1435 static int
1436 reap_kids(waitfor)
1437     int waitfor;
1438 {
1439     int pid, status;
1440     struct subprocess *chp, **prevp;
1441
1442     if (n_children == 0)
1443         return 0;
1444     while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1445            && pid != 0) {
1446         for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1447             if (chp->pid == pid) {
1448                 --n_children;
1449                 *prevp = chp->next;
1450                 break;
1451             }
1452         }
1453         if (WIFSIGNALED(status)) {
1454             warn("Child process %s (pid %d) terminated with signal %d",
1455                  (chp? chp->prog: "??"), pid, WTERMSIG(status));
1456         } else if (debug)
1457             dbglog("Script %s finished (pid %d), status = 0x%x",
1458                    (chp? chp->prog: "??"), pid, status);
1459         if (chp && chp->done)
1460             (*chp->done)(chp->arg);
1461         if (chp)
1462             free(chp);
1463     }
1464     if (pid == -1) {
1465         if (errno == ECHILD)
1466             return -1;
1467         if (errno != EINTR)
1468             error("Error waiting for child process: %m");
1469     }
1470     return 0;
1471 }
1472
1473 /*
1474  * script_setenv - set an environment variable value to be used
1475  * for scripts that we run (e.g. ip-up, auth-up, etc.)
1476  */
1477 void
1478 script_setenv(var, value, iskey)
1479     char *var, *value;
1480     int iskey;
1481 {
1482     size_t varl = strlen(var);
1483     size_t vl = varl + strlen(value) + 2;
1484     int i;
1485     char *p, *newstring;
1486
1487     newstring = (char *) malloc(vl+1);
1488     if (newstring == 0)
1489         return;
1490     *newstring++ = iskey;
1491     slprintf(newstring, vl, "%s=%s", var, value);
1492
1493     /* check if this variable is already set */
1494     if (script_env != 0) {
1495         for (i = 0; (p = script_env[i]) != 0; ++i) {
1496             if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1497                 if (p[-1] && pppdb != NULL)
1498                     delete_db_key(p);
1499                 free(p-1);
1500                 script_env[i] = newstring;
1501                 if (iskey && pppdb != NULL)
1502                     add_db_key(newstring);
1503                 update_db_entry();
1504                 return;
1505             }
1506         }
1507     } else {
1508         /* no space allocated for script env. ptrs. yet */
1509         i = 0;
1510         script_env = (char **) malloc(16 * sizeof(char *));
1511         if (script_env == 0)
1512             return;
1513         s_env_nalloc = 16;
1514     }
1515
1516     /* reallocate script_env with more space if needed */
1517     if (i + 1 >= s_env_nalloc) {
1518         int new_n = i + 17;
1519         char **newenv = (char **) realloc((void *)script_env,
1520                                           new_n * sizeof(char *));
1521         if (newenv == 0)
1522             return;
1523         script_env = newenv;
1524         s_env_nalloc = new_n;
1525     }
1526
1527     script_env[i] = newstring;
1528     script_env[i+1] = 0;
1529
1530     if (pppdb != NULL) {
1531         if (iskey)
1532             add_db_key(newstring);
1533         update_db_entry();
1534     }
1535 }
1536
1537 /*
1538  * script_unsetenv - remove a variable from the environment
1539  * for scripts.
1540  */
1541 void
1542 script_unsetenv(var)
1543     char *var;
1544 {
1545     int vl = strlen(var);
1546     int i;
1547     char *p;
1548
1549     if (script_env == 0)
1550         return;
1551     for (i = 0; (p = script_env[i]) != 0; ++i) {
1552         if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1553             if (p[-1] && pppdb != NULL)
1554                 delete_db_key(p);
1555             free(p-1);
1556             while ((script_env[i] = script_env[i+1]) != 0)
1557                 ++i;
1558             break;
1559         }
1560     }
1561     if (pppdb != NULL)
1562         update_db_entry();
1563 }