pppd/options.c

   1 /*
   2  * options.c - handles option processing for PPP.
   3  *
   4  * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  *
  18  * 3. The name "Carnegie Mellon University" must not be used to
  19  *    endorse or promote products derived from this software without
  20  *    prior written permission. For permission or any legal
  21  *    details, please contact
  22  *      Office of Technology Transfer
  23  *      Carnegie Mellon University
  24  *      5000 Forbes Avenue
  25  *      Pittsburgh, PA  15213-3890
  26  *      (412) 268-4387, fax: (412) 268-7395
  27  *      tech-transfer@andrew.cmu.edu
  28  *
  29  * 4. Redistributions of any form whatsoever must retain the following
  30  *    acknowledgment:
  31  *    "This product includes software developed by Computing Services
  32  *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
  33  *
  34  * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
  35  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  36  * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
  37  * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  38  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  39  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  40  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  41  */
  42
  43 #define RCSID   "$Id: options.c,v 1.98 2005/07/13 12:31:36 paulus Exp $"
  44
  45 #include <ctype.h>
  46 #include <stdio.h>
  47 #include <errno.h>
  48 #include <unistd.h>
  49 #include <fcntl.h>
  50 #include <stdlib.h>
  51 #include <syslog.h>
  52 #include <string.h>
  53 #include <pwd.h>
  54 #ifdef PLUGIN
  55 #include <dlfcn.h>
  56 #endif
  57
  58 #ifdef PPP_FILTER
  59 #include <pcap.h>
  60 /*
  61  * There have been 3 or 4 different names for this in libpcap CVS, but
  62  * this seems to be what they have settled on...
  63  * For older versions of libpcap, use DLT_PPP - but that means
  64  * we lose the inbound and outbound qualifiers.
  65  */
  66 #ifndef DLT_PPP_PPPD
  67 #ifdef DLT_PPP_WITHDIRECTION
  68 #define DLT_PPP_PPPD    DLT_PPP_WITHDIRECTION
  69 #else
  70 #define DLT_PPP_PPPD    DLT_PPP
  71 #endif
  72 #endif
  73 #endif /* PPP_FILTER */
  74
  75 #include "pppd.h"
  76 #include "pathnames.h"
  77
  78 #if defined(ultrix) || defined(NeXT)
  79 char *strdup __P((char *));
  80 #endif
  81
  82 static const char rcsid[] = RCSID;
  83
  84 struct option_value {
  85     struct option_value *next;
  86     const char *source;
  87     char value[1];
  88 };
  89
  90 /*
  91  * Option variables and default values.
  92  */
  93 int     debug = 0;              /* Debug flag */
  94 int     kdebugflag = 0;         /* Tell kernel to print debug messages */
  95 int     default_device = 1;     /* Using /dev/tty or equivalent */
  96 char    devnam[MAXPATHLEN];     /* Device name */
  97 bool    nodetach = 0;           /* Don't detach from controlling tty */
  98 bool    updetach = 0;           /* Detach once link is up */
  99 int     maxconnect = 0;         /* Maximum connect time */
 100 char    user[MAXNAMELEN];       /* Username for PAP */
 101 char    passwd[MAXSECRETLEN];   /* Password for PAP */
 102 bool    persist = 0;            /* Reopen link after it goes down */
 103 char    our_name[MAXNAMELEN];   /* Our name for authentication purposes */
 104 bool    demand = 0;             /* do dial-on-demand */
 105 char    *ipparam = NULL;        /* Extra parameter for ip up/down scripts */
 106 int     idle_time_limit = 0;    /* Disconnect if idle for this many seconds */
 107 int     holdoff = 30;           /* # seconds to pause before reconnecting */
 108 bool    holdoff_specified;      /* true if a holdoff value has been given */
 109 int     log_to_fd = 1;          /* send log messages to this fd too */
 110 bool    log_default = 1;        /* log_to_fd is default (stdout) */
 111 int     maxfail = 10;           /* max # of unsuccessful connection attempts */
 112 char    linkname[MAXPATHLEN];   /* logical name for link */
 113 bool    tune_kernel;            /* may alter kernel settings */
 114 int     connect_delay = 1000;   /* wait this many ms after connect script */
 115 int     req_unit = -1;          /* requested interface unit */
 116 bool    multilink = 0;          /* Enable multilink operation */
 117 char    *bundle_name = NULL;    /* bundle name for multilink */
 118 bool    dump_options;           /* print out option values */
 119 bool    dryrun;                 /* print out option values and exit */
 120 char    *domain;                /* domain name set by domain option */
 121 int     child_wait = 5;         /* # seconds to wait for children at exit */
 122
 123 #ifdef MAXOCTETS
 124 unsigned int  maxoctets = 0;    /* default - no limit */
 125 int maxoctets_dir = 0;       /* default - sum of traffic */
 126 int maxoctets_timeout = 1;   /* default 1 second */
 127 #endif
 128
 129
 130 extern option_t auth_options[];
 131 extern struct stat devstat;
 132
 133 #ifdef PPP_FILTER
 134 struct  bpf_program pass_filter;/* Filter program for packets to pass */
 135 struct  bpf_program active_filter; /* Filter program for link-active pkts */
 136 #endif
 137
 138 char *current_option;           /* the name of the option being parsed */
 139 int  privileged_option;         /* set iff the current option came from root */
 140 char *option_source;            /* string saying where the option came from */
 141 int  option_priority = OPRIO_CFGFILE; /* priority of the current options */
 142 bool devnam_fixed;              /* can no longer change device name */
 143
 144 static int logfile_fd = -1;     /* fd opened for log file */
 145 static char logfile_name[MAXPATHLEN];   /* name of log file */
 146
 147 /*
 148  * Prototypes
 149  */
 150 static int setdomain __P((char **));
 151 static int readfile __P((char **));
 152 static int callfile __P((char **));
 153 static int showversion __P((char **));
 154 static int showhelp __P((char **));
 155 static void usage __P((void));
 156 static int setlogfile __P((char **));
 157 #ifdef PLUGIN
 158 static int loadplugin __P((char **));
 159 #endif
 160
 161 #ifdef PPP_FILTER
 162 static int setpassfilter __P((char **));
 163 static int setactivefilter __P((char **));
 164 #endif
 165
 166 #ifdef MAXOCTETS
 167 static int setmodir __P((char **));
 168 #endif
 169
 170 static option_t *find_option __P((const char *name));
 171 static int process_option __P((option_t *, char *, char **));
 172 static int n_arguments __P((option_t *));
 173 static int number_option __P((char *, u_int32_t *, int));
 174
 175 /*
 176  * Structure to store extra lists of options.
 177  */
 178 struct option_list {
 179     option_t *options;
 180     struct option_list *next;
 181 };
 182
 183 static struct option_list *extra_options = NULL;
 184
 185 /*
 186  * Valid arguments.
 187  */
 188 option_t general_options[] = {
 189     { "debug", o_int, &debug,
 190       "Increase debugging level", OPT_INC | OPT_NOARG | 1 },
 191     { "-d", o_int, &debug,
 192       "Increase debugging level",
 193       OPT_ALIAS | OPT_INC | OPT_NOARG | 1 },
 194
 195     { "kdebug", o_int, &kdebugflag,
 196       "Set kernel driver debug level", OPT_PRIO },
 197
 198     { "nodetach", o_bool, &nodetach,
 199       "Don't detach from controlling tty", OPT_PRIO | 1 },
 200     { "-detach", o_bool, &nodetach,
 201       "Don't detach from controlling tty", OPT_ALIAS | OPT_PRIOSUB | 1 },
 202     { "updetach", o_bool, &updetach,
 203       "Detach from controlling tty once link is up",
 204       OPT_PRIOSUB | OPT_A2CLR | 1, &nodetach },
 205
 206     { "holdoff", o_int, &holdoff,
 207       "Set time in seconds before retrying connection",
 208       OPT_PRIO, &holdoff_specified },
 209
 210     { "idle", o_int, &idle_time_limit,
 211       "Set time in seconds before disconnecting idle link", OPT_PRIO },
 212
 213     { "maxconnect", o_int, &maxconnect,
 214       "Set connection time limit",
 215       OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
 216
 217     { "domain", o_special, (void *)setdomain,
 218       "Add given domain name to hostname",
 219       OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
 220
 221     { "file", o_special, (void *)readfile,
 222       "Take options from a file", OPT_NOPRINT },
 223     { "call", o_special, (void *)callfile,
 224       "Take options from a privileged file", OPT_NOPRINT },
 225
 226     { "persist", o_bool, &persist,
 227       "Keep on reopening connection after close", OPT_PRIO | 1 },
 228     { "nopersist", o_bool, &persist,
 229       "Turn off persist option", OPT_PRIOSUB },
 230
 231     { "demand", o_bool, &demand,
 232       "Dial on demand", OPT_INITONLY | 1, &persist },
 233
 234     { "--version", o_special_noarg, (void *)showversion,
 235       "Show version number" },
 236     { "--help", o_special_noarg, (void *)showhelp,
 237       "Show brief listing of options" },
 238     { "-h", o_special_noarg, (void *)showhelp,
 239       "Show brief listing of options", OPT_ALIAS },
 240
 241     { "logfile", o_special, (void *)setlogfile,
 242       "Append log messages to this file",
 243       OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, &logfile_name },
 244     { "logfd", o_int, &log_to_fd,
 245       "Send log messages to this file descriptor",
 246       OPT_PRIOSUB | OPT_A2CLR, &log_default },
 247     { "nolog", o_int, &log_to_fd,
 248       "Don't send log messages to any file",
 249       OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) },
 250     { "nologfd", o_int, &log_to_fd,
 251       "Don't send log messages to any file descriptor",
 252       OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
 253
 254     { "linkname", o_string, linkname,
 255       "Set logical name for link",
 256       OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
 257
 258     { "maxfail", o_int, &maxfail,
 259       "Maximum number of unsuccessful connection attempts to allow",
 260       OPT_PRIO },
 261
 262     { "ktune", o_bool, &tune_kernel,
 263       "Alter kernel settings as necessary", OPT_PRIO | 1 },
 264     { "noktune", o_bool, &tune_kernel,
 265       "Don't alter kernel settings", OPT_PRIOSUB },
 266
 267     { "connect-delay", o_int, &connect_delay,
 268       "Maximum time (in ms) to wait after connect script finishes",
 269       OPT_PRIO },
 270
 271     { "unit", o_int, &req_unit,
 272       "PPP interface unit number to use if possible",
 273       OPT_PRIO | OPT_LLIMIT, 0, 0 },
 274
 275     { "dump", o_bool, &dump_options,
 276       "Print out option values after parsing all options", 1 },
 277     { "dryrun", o_bool, &dryrun,
 278       "Stop after parsing, printing, and checking options", 1 },
 279
 280     { "child-timeout", o_int, &child_wait,
 281       "Number of seconds to wait for child processes at exit",
 282       OPT_PRIO },
 283
 284 #ifdef HAVE_MULTILINK
 285     { "multilink", o_bool, &multilink,
 286       "Enable multilink operation", OPT_PRIO | 1 },
 287     { "mp", o_bool, &multilink,
 288       "Enable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 1 },
 289     { "nomultilink", o_bool, &multilink,
 290       "Disable multilink operation", OPT_PRIOSUB | 0 },
 291     { "nomp", o_bool, &multilink,
 292       "Disable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 0 },
 293
 294     { "bundle", o_string, &bundle_name,
 295       "Bundle name for multilink", OPT_PRIO },
 296 #endif /* HAVE_MULTILINK */
 297
 298 #ifdef PLUGIN
 299     { "plugin", o_special, (void *)loadplugin,
 300       "Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
 301 #endif
 302
 303 #ifdef PPP_FILTER
 304     { "pass-filter", o_special, setpassfilter,
 305       "set filter for packets to pass", OPT_PRIO },
 306
 307     { "active-filter", o_special, setactivefilter,
 308       "set filter for active pkts", OPT_PRIO },
 309 #endif
 310
 311 #ifdef MAXOCTETS
 312     { "maxoctets", o_int, &maxoctets,
 313       "Set connection traffic limit",
 314       OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
 315     { "mo", o_int, &maxoctets,
 316       "Set connection traffic limit",
 317       OPT_ALIAS | OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
 318     { "mo-direction", o_special, setmodir,
 319       "Set direction for limit traffic (sum,in,out,max)" },
 320     { "mo-timeout", o_int, &maxoctets_timeout,
 321       "Check for traffic limit every N seconds", OPT_PRIO | OPT_LLIMIT | 1 },
 322 #endif
 323
 324     { NULL }
 325 };
 326
 327 #ifndef IMPLEMENTATION
 328 #define IMPLEMENTATION ""
 329 #endif
 330
 331 static char *usage_string = "\
 332 pppd version %s\n\
 333 Usage: %s [ options ], where options are:\n\
 334         <device>        Communicate over the named device\n\
 335         <speed>         Set the baud rate to <speed>\n\
 336         <loc>:<rem>     Set the local and/or remote interface IP\n\
 337                         addresses.  Either one may be omitted.\n\
 338         asyncmap <n>    Set the desired async map to hex <n>\n\
 339         auth            Require authentication from peer\n\
 340         connect <p>     Invoke shell command <p> to set up the serial line\n\
 341         crtscts         Use hardware RTS/CTS flow control\n\
 342         defaultroute    Add default route through interface\n\
 343         file <f>        Take options from file <f>\n\
 344         modem           Use modem control lines\n\
 345         mru <n>         Set MRU value to <n> for negotiation\n\
 346 See pppd(8) for more options.\n\
 347 ";
 348
 349 /*
 350  * parse_args - parse a string of arguments from the command line.
 351  */
 352 int
 353 parse_args(argc, argv)
 354     int argc;
 355     char **argv;
 356 {
 357     char *arg;
 358     option_t *opt;
 359     int n;
 360
 361     privileged_option = privileged;
 362     option_source = "command line";
 363     option_priority = OPRIO_CMDLINE;
 364     while (argc > 0) {
 365         arg = *argv++;
 366         --argc;
 367         opt = find_option(arg);
 368         if (opt == NULL) {
 369             option_error("unrecognized option '%s'", arg);
 370             usage();
 371             return 0;
 372         }
 373         n = n_arguments(opt);
 374         if (argc < n) {
 375             option_error("too few parameters for option %s", arg);
 376             return 0;
 377         }
 378         if (!process_option(opt, arg, argv))
 379             return 0;
 380         argc -= n;
 381         argv += n;
 382     }
 383     return 1;
 384 }
 385
 386 /*
 387  * options_from_file - Read a string of options from a file,
 388  * and interpret them.
 389  */
 390 int
 391 options_from_file(filename, must_exist, check_prot, priv)
 392     char *filename;
 393     int must_exist;
 394     int check_prot;
 395     int priv;
 396 {
 397     FILE *f;
 398     int i, newline, ret, err;
 399     option_t *opt;
 400     int oldpriv, n;
 401     char *oldsource;
 402     char *argv[MAXARGS];
 403     char args[MAXARGS][MAXWORDLEN];
 404     char cmd[MAXWORDLEN];
 405
 406     if (check_prot)
 407         seteuid(getuid());
 408     f = fopen(filename, "r");
 409     err = errno;
 410     if (check_prot)
 411         seteuid(0);
 412     if (f == NULL) {
 413         errno = err;
 414         if (!must_exist) {
 415             if (err != ENOENT && err != ENOTDIR)
 416                 warn("Warning: can't open options file %s: %m", filename);
 417             return 1;
 418         }
 419         option_error("Can't open options file %s: %m", filename);
 420         return 0;
 421     }
 422
 423     oldpriv = privileged_option;
 424     privileged_option = priv;
 425     oldsource = option_source;
 426     option_source = strdup(filename);
 427     if (option_source == NULL)
 428         option_source = "file";
 429     ret = 0;
 430     while (getword(f, cmd, &newline, filename)) {
 431         opt = find_option(cmd);
 432         if (opt == NULL) {
 433             option_error("In file %s: unrecognized option '%s'",
 434                          filename, cmd);
 435             goto err;
 436         }
 437         n = n_arguments(opt);
 438         for (i = 0; i < n; ++i) {
 439             if (!getword(f, args[i], &newline, filename)) {
 440                 option_error(
 441                         "In file %s: too few parameters for option '%s'",
 442                         filename, cmd);
 443                 goto err;
 444             }
 445             argv[i] = args[i];
 446         }
 447         if (!process_option(opt, cmd, argv))
 448             goto err;
 449     }
 450     ret = 1;
 451
 452 err:
 453     fclose(f);
 454     privileged_option = oldpriv;
 455     option_source = oldsource;
 456     return ret;
 457 }
 458
 459 /*
 460  * options_from_user - See if the use has a ~/.ppprc file,
 461  * and if so, interpret options from it.
 462  */
 463 int
 464 options_from_user()
 465 {
 466     char *user, *path, *file;
 467     int ret;
 468     struct passwd *pw;
 469     size_t pl;
 470
 471     pw = getpwuid(getuid());
 472     if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
 473         return 1;
 474     file = _PATH_USEROPT;
 475     pl = strlen(user) + strlen(file) + 2;
 476     path = malloc(pl);
 477     if (path == NULL)
 478         novm("init file name");
 479     slprintf(path, pl, "%s/%s", user, file);
 480     option_priority = OPRIO_CFGFILE;
 481     ret = options_from_file(path, 0, 1, privileged);
 482     free(path);
 483     return ret;
 484 }
 485
 486 /*
 487  * options_for_tty - See if an options file exists for the serial
 488  * device, and if so, interpret options from it.
 489  * We only allow the per-tty options file to override anything from
 490  * the command line if it is something that the user can't override
 491  * once it has been set by root; this is done by giving configuration
 492  * files a lower priority than the command line.
 493  */
 494 int
 495 options_for_tty()
 496 {
 497     char *dev, *path, *p;
 498     int ret;
 499     size_t pl;
 500
 501     dev = devnam;
 502     if ((p = strstr(dev, "/dev/")) != NULL)
 503         dev = p + 5;
 504     if (dev[0] == 0 || strcmp(dev, "tty") == 0)
 505         return 1;               /* don't look for /etc/ppp/options.tty */
 506     pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
 507     path = malloc(pl);
 508     if (path == NULL)
 509         novm("tty init file name");
 510     slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
 511     /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
 512     for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
 513         if (*p == '/')
 514             *p = '.';
 515     option_priority = OPRIO_CFGFILE;
 516     ret = options_from_file(path, 0, 0, 1);
 517     free(path);
 518     return ret;
 519 }
 520
 521 /*
 522  * options_from_list - process a string of options in a wordlist.
 523  */
 524 int
 525 options_from_list(w, priv)
 526     struct wordlist *w;
 527     int priv;
 528 {
 529     char *argv[MAXARGS];
 530     option_t *opt;
 531     int i, n, ret = 0;
 532     struct wordlist *w0;
 533
 534     privileged_option = priv;
 535     option_source = "secrets file";
 536     option_priority = OPRIO_SECFILE;
 537
 538     while (w != NULL) {
 539         opt = find_option(w->word);
 540         if (opt == NULL) {
 541             option_error("In secrets file: unrecognized option '%s'",
 542                          w->word);
 543             goto err;
 544         }
 545         n = n_arguments(opt);
 546         w0 = w;
 547         for (i = 0; i < n; ++i) {
 548             w = w->next;
 549             if (w == NULL) {
 550                 option_error(
 551                         "In secrets file: too few parameters for option '%s'",
 552                         w0->word);
 553                 goto err;
 554             }
 555             argv[i] = w->word;
 556         }
 557         if (!process_option(opt, w0->word, argv))
 558             goto err;
 559         w = w->next;
 560     }
 561     ret = 1;
 562
 563 err:
 564     return ret;
 565 }
 566
 567 /*
 568  * match_option - see if this option matches an option_t structure.
 569  */
 570 static int
 571 match_option(name, opt, dowild)
 572     char *name;
 573     option_t *opt;
 574     int dowild;
 575 {
 576         int (*match) __P((char *, char **, int));
 577
 578         if (dowild != (opt->type == o_wild))
 579                 return 0;
 580         if (!dowild)
 581                 return strcmp(name, opt->name) == 0;
 582         match = (int (*) __P((char *, char **, int))) opt->addr;
 583         return (*match)(name, NULL, 0);
 584 }
 585
 586 /*
 587  * find_option - scan the option lists for the various protocols
 588  * looking for an entry with the given name.
 589  * This could be optimized by using a hash table.
 590  */
 591 static option_t *
 592 find_option(name)
 593     const char *name;
 594 {
 595         option_t *opt;
 596         struct option_list *list;
 597         int i, dowild;
 598
 599         for (dowild = 0; dowild <= 1; ++dowild) {
 600                 for (opt = general_options; opt->name != NULL; ++opt)
 601                         if (match_option(name, opt, dowild))
 602                                 return opt;
 603                 for (opt = auth_options; opt->name != NULL; ++opt)
 604                         if (match_option(name, opt, dowild))
 605                                 return opt;
 606                 for (list = extra_options; list != NULL; list = list->next)
 607                         for (opt = list->options; opt->name != NULL; ++opt)
 608                                 if (match_option(name, opt, dowild))
 609                                         return opt;
 610                 for (opt = the_channel->options; opt->name != NULL; ++opt)
 611                         if (match_option(name, opt, dowild))
 612                                 return opt;
 613                 for (i = 0; protocols[i] != NULL; ++i)
 614                         if ((opt = protocols[i]->options) != NULL)
 615                                 for (; opt->name != NULL; ++opt)
 616                                         if (match_option(name, opt, dowild))
 617                                                 return opt;
 618         }
 619         return NULL;
 620 }
 621
 622 /*
 623  * process_option - process one new-style option.
 624  */
 625 static int
 626 process_option(opt, cmd, argv)
 627     option_t *opt;
 628     char *cmd;
 629     char **argv;
 630 {
 631     u_int32_t v;
 632     int iv, a;
 633     char *sv;
 634     int (*parser) __P((char **));
 635     int (*wildp) __P((char *, char **, int));
 636     char *optopt = (opt->type == o_wild)? "": " option";
 637     int prio = option_priority;
 638     option_t *mainopt = opt;
 639
 640     current_option = opt->name;
 641     if ((opt->flags & OPT_PRIVFIX) && privileged_option)
 642         prio += OPRIO_ROOT;
 643     while (mainopt->flags & OPT_PRIOSUB)
 644         --mainopt;
 645     if (mainopt->flags & OPT_PRIO) {
 646         if (prio < mainopt->priority) {
 647             /* new value doesn't override old */
 648             if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
 649                 option_error("%s%s set in %s cannot be overridden\n",
 650                              opt->name, optopt, mainopt->source);
 651                 return 0;
 652             }
 653             return 1;
 654         }
 655         if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
 656             warn("%s%s from %s overrides command line",
 657                  opt->name, optopt, option_source);
 658     }
 659
 660     if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
 661         option_error("%s%s cannot be changed after initialization",
 662                      opt->name, optopt);
 663         return 0;
 664     }
 665     if ((opt->flags & OPT_PRIV) && !privileged_option) {
 666         option_error("using the %s%s requires root privilege",
 667                      opt->name, optopt);
 668         return 0;
 669     }
 670     if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
 671         option_error("%s%s is disabled", opt->name, optopt);
 672         return 0;
 673     }
 674     if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
 675         option_error("the %s%s may not be changed in %s",
 676                      opt->name, optopt, option_source);
 677         return 0;
 678     }
 679
 680     switch (opt->type) {
 681     case o_bool:
 682         v = opt->flags & OPT_VALUE;
 683         *(bool *)(opt->addr) = v;
 684         if (opt->addr2 && (opt->flags & OPT_A2COPY))
 685             *(bool *)(opt->addr2) = v;
 686         else if (opt->addr2 && (opt->flags & OPT_A2CLR))
 687             *(bool *)(opt->addr2) = 0;
 688         else if (opt->addr2 && (opt->flags & OPT_A2CLRB))
 689             *(u_char *)(opt->addr2) &= ~v;
 690         else if (opt->addr2 && (opt->flags & OPT_A2OR))
 691             *(u_char *)(opt->addr2) |= v;
 692         break;
 693
 694     case o_int:
 695         iv = 0;
 696         if ((opt->flags & OPT_NOARG) == 0) {
 697             if (!int_option(*argv, &iv))
 698                 return 0;
 699             if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
 700                  || ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
 701                 && !((opt->flags & OPT_ZEROOK && iv == 0))) {
 702                 char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
 703                 switch (opt->flags & OPT_LIMITS) {
 704                 case OPT_LLIMIT:
 705                     option_error("%s value must be%s >= %d",
 706                                  opt->name, zok, opt->lower_limit);
 707                     break;
 708                 case OPT_ULIMIT:
 709                     option_error("%s value must be%s <= %d",
 710                                  opt->name, zok, opt->upper_limit);
 711                     break;
 712                 case OPT_LIMITS:
 713                     option_error("%s value must be%s between %d and %d",
 714                                 opt->name, zok, opt->lower_limit, opt->upper_limit);
 715                     break;
 716                 }
 717                 return 0;
 718             }
 719         }
 720         a = opt->flags & OPT_VALUE;
 721         if (a >= 128)
 722             a -= 256;           /* sign extend */
 723         iv += a;
 724         if (opt->flags & OPT_INC)
 725             iv += *(int *)(opt->addr);
 726         if ((opt->flags & OPT_NOINCR) && !privileged_option) {
 727             int oldv = *(int *)(opt->addr);
 728             if ((opt->flags & OPT_ZEROINF) ?
 729                 (oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
 730                 option_error("%s value cannot be increased", opt->name);
 731                 return 0;
 732             }
 733         }
 734         *(int *)(opt->addr) = iv;
 735         if (opt->addr2 && (opt->flags & OPT_A2COPY))
 736             *(int *)(opt->addr2) = iv;
 737         break;
 738
 739     case o_uint32:
 740         if (opt->flags & OPT_NOARG) {
 741             v = opt->flags & OPT_VALUE;
 742             if (v & 0x80)
 743                     v |= 0xffffff00U;
 744         } else if (!number_option(*argv, &v, 16))
 745             return 0;
 746         if (opt->flags & OPT_OR)
 747             v |= *(u_int32_t *)(opt->addr);
 748         *(u_int32_t *)(opt->addr) = v;
 749         if (opt->addr2 && (opt->flags & OPT_A2COPY))
 750             *(u_int32_t *)(opt->addr2) = v;
 751         break;
 752
 753     case o_string:
 754         if (opt->flags & OPT_STATIC) {
 755             strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
 756         } else {
 757             sv = strdup(*argv);
 758             if (sv == NULL)
 759                 novm("option argument");
 760             *(char **)(opt->addr) = sv;
 761         }
 762         break;
 763
 764     case o_special_noarg:
 765     case o_special:
 766         parser = (int (*) __P((char **))) opt->addr;
 767         if (!(*parser)(argv))
 768             return 0;
 769         if (opt->flags & OPT_A2LIST) {
 770             struct option_value *ovp, **pp;
 771
 772             ovp = malloc(sizeof(*ovp) + strlen(*argv));
 773             if (ovp != 0) {
 774                 strcpy(ovp->value, *argv);
 775                 ovp->source = option_source;
 776                 ovp->next = NULL;
 777                 pp = (struct option_value **) &opt->addr2;
 778                 while (*pp != 0)
 779                     pp = &(*pp)->next;
 780                 *pp = ovp;
 781             }
 782         }
 783         break;
 784
 785     case o_wild:
 786         wildp = (int (*) __P((char *, char **, int))) opt->addr;
 787         if (!(*wildp)(cmd, argv, 1))
 788             return 0;
 789         break;
 790     }
 791
 792     if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
 793                 |OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST|OPT_A2OR)) == 0)
 794         *(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
 795
 796     mainopt->source = option_source;
 797     mainopt->priority = prio;
 798     mainopt->winner = opt - mainopt;
 799
 800     return 1;
 801 }
 802
 803 /*
 804  * override_value - if the option priorities would permit us to
 805  * override the value of option, return 1 and update the priority
 806  * and source of the option value.  Otherwise returns 0.
 807  */
 808 int
 809 override_value(option, priority, source)
 810     const char *option;
 811     int priority;
 812     const char *source;
 813 {
 814         option_t *opt;
 815
 816         opt = find_option(option);
 817         if (opt == NULL)
 818                 return 0;
 819         while (opt->flags & OPT_PRIOSUB)
 820                 --opt;
 821         if ((opt->flags & OPT_PRIO) && priority < opt->priority)
 822                 return 0;
 823         opt->priority = priority;
 824         opt->source = source;
 825         opt->winner = -1;
 826         return 1;
 827 }
 828
 829 /*
 830  * n_arguments - tell how many arguments an option takes
 831  */
 832 static int
 833 n_arguments(opt)
 834     option_t *opt;
 835 {
 836         return (opt->type == o_bool || opt->type == o_special_noarg
 837                 || (opt->flags & OPT_NOARG))? 0: 1;
 838 }
 839
 840 /*
 841  * add_options - add a list of options to the set we grok.
 842  */
 843 void
 844 add_options(opt)
 845     option_t *opt;
 846 {
 847     struct option_list *list;
 848
 849     list = malloc(sizeof(*list));
 850     if (list == 0)
 851         novm("option list entry");
 852     list->options = opt;
 853     list->next = extra_options;
 854     extra_options = list;
 855 }
 856
 857 /*
 858  * check_options - check that options are valid and consistent.
 859  */
 860 void
 861 check_options()
 862 {
 863         if (logfile_fd >= 0 && logfile_fd != log_to_fd)
 864                 close(logfile_fd);
 865 }
 866
 867 /*
 868  * print_option - print out an option and its value
 869  */
 870 static void
 871 print_option(opt, mainopt, printer, arg)
 872     option_t *opt, *mainopt;
 873     void (*printer) __P((void *, char *, ...));
 874     void *arg;
 875 {
 876         int i, v;
 877         char *p;
 878
 879         if (opt->flags & OPT_NOPRINT)
 880                 return;
 881         switch (opt->type) {
 882         case o_bool:
 883                 v = opt->flags & OPT_VALUE;
 884                 if (*(bool *)opt->addr != v)
 885                         /* this can happen legitimately, e.g. lock
 886                            option turned off for default device */
 887                         break;
 888                 printer(arg, "%s", opt->name);
 889                 break;
 890         case o_int:
 891                 v = opt->flags & OPT_VALUE;
 892                 if (v >= 128)
 893                         v -= 256;
 894                 i = *(int *)opt->addr;
 895                 if (opt->flags & OPT_NOARG) {
 896                         printer(arg, "%s", opt->name);
 897                         if (i != v) {
 898                                 if (opt->flags & OPT_INC) {
 899                                         for (; i > v; i -= v)
 900                                                 printer(arg, " %s", opt->name);
 901                                 } else
 902                                         printer(arg, " # oops: %d not %d\n",
 903                                                 i, v);
 904                         }
 905                 } else {
 906                         printer(arg, "%s %d", opt->name, i);
 907                 }
 908                 break;
 909         case o_uint32:
 910                 printer(arg, "%s", opt->name);
 911                 if ((opt->flags & OPT_NOARG) == 0)
 912                         printer(arg, " %x", *(u_int32_t *)opt->addr);
 913                 break;
 914
 915         case o_string:
 916                 if (opt->flags & OPT_HIDE) {
 917                         p = "??????";
 918                 } else {
 919                         p = (char *) opt->addr;
 920                         if ((opt->flags & OPT_STATIC) == 0)
 921                                 p = *(char **)p;
 922                 }
 923                 printer(arg, "%s %q", opt->name, p);
 924                 break;
 925
 926         case o_special:
 927         case o_special_noarg:
 928         case o_wild:
 929                 if (opt->type != o_wild) {
 930                         printer(arg, "%s", opt->name);
 931                         if (n_arguments(opt) == 0)
 932                                 break;
 933                         printer(arg, " ");
 934                 }
 935                 if (opt->flags & OPT_A2PRINTER) {
 936                         void (*oprt) __P((option_t *,
 937                                           void ((*)__P((void *, char *, ...))),
 938                                           void *));
 939                         oprt = (void (*) __P((option_t *,
 940                                          void ((*)__P((void *, char *, ...))),
 941                                          void *)))opt->addr2;
 942                         (*oprt)(opt, printer, arg);
 943                 } else if (opt->flags & OPT_A2STRVAL) {
 944                         p = (char *) opt->addr2;
 945                         if ((opt->flags & OPT_STATIC) == 0)
 946                                 p = *(char **)p;
 947                         printer("%q", p);
 948                 } else if (opt->flags & OPT_A2LIST) {
 949                         struct option_value *ovp;
 950
 951                         ovp = (struct option_value *) opt->addr2;
 952                         for (;;) {
 953                                 printer(arg, "%q", ovp->value);
 954                                 if ((ovp = ovp->next) == NULL)
 955                                         break;
 956                                 printer(arg, "\t\t# (from %s)\n%s ",
 957                                         ovp->source, opt->name);
 958                         }
 959                 } else {
 960                         printer(arg, "xxx # [don't know how to print value]");
 961                 }
 962                 break;
 963
 964         default:
 965                 printer(arg, "# %s value (type %d\?\?)", opt->name, opt->type);
 966                 break;
 967         }
 968         printer(arg, "\t\t# (from %s)\n", mainopt->source);
 969 }
 970
 971 /*
 972  * print_option_list - print out options in effect from an
 973  * array of options.
 974  */
 975 static void
 976 print_option_list(opt, printer, arg)
 977     option_t *opt;
 978     void (*printer) __P((void *, char *, ...));
 979     void *arg;
 980 {
 981         while (opt->name != NULL) {
 982                 if (opt->priority != OPRIO_DEFAULT
 983                     && opt->winner != (short int) -1)
 984                         print_option(opt + opt->winner, opt, printer, arg);
 985                 do {
 986                         ++opt;
 987                 } while (opt->flags & OPT_PRIOSUB);
 988         }
 989 }
 990
 991 /*
 992  * print_options - print out what options are in effect.
 993  */
 994 void
 995 print_options(printer, arg)
 996     void (*printer) __P((void *, char *, ...));
 997     void *arg;
 998 {
 999         struct option_list *list;
1000         int i;
1001
1002         printer(arg, "pppd options in effect:\n");
1003         print_option_list(general_options, printer, arg);
1004         print_option_list(auth_options, printer, arg);
1005         for (list = extra_options; list != NULL; list = list->next)
1006                 print_option_list(list->options, printer, arg);
1007         print_option_list(the_channel->options, printer, arg);
1008         for (i = 0; protocols[i] != NULL; ++i)
1009                 print_option_list(protocols[i]->options, printer, arg);
1010 }
1011
1012 /*
1013  * usage - print out a message telling how to use the program.
1014  */
1015 static void
1016 usage()
1017 {
1018     if (phase == PHASE_INITIALIZE)
1019         fprintf(stderr, usage_string, VERSION, progname);
1020 }
1021
1022 /*
1023  * showhelp - print out usage message and exit.
1024  */
1025 static int
1026 showhelp(argv)
1027     char **argv;
1028 {
1029     if (phase == PHASE_INITIALIZE) {
1030         usage();
1031         exit(0);
1032     }
1033     return 0;
1034 }
1035
1036 /*
1037  * showversion - print out the version number and exit.
1038  */
1039 static int
1040 showversion(argv)
1041     char **argv;
1042 {
1043     if (phase == PHASE_INITIALIZE) {
1044         fprintf(stderr, "pppd version %s\n", VERSION);
1045         exit(0);
1046     }
1047     return 0;
1048 }
1049
1050 /*
1051  * option_error - print a message about an error in an option.
1052  * The message is logged, and also sent to
1053  * stderr if phase == PHASE_INITIALIZE.
1054  */
1055 void
1056 option_error __V((char *fmt, ...))
1057 {
1058     va_list args;
1059     char buf[1024];
1060
1061 #if defined(__STDC__)
1062     va_start(args, fmt);
1063 #else
1064     char *fmt;
1065     va_start(args);
1066     fmt = va_arg(args, char *);
1067 #endif
1068     vslprintf(buf, sizeof(buf), fmt, args);
1069     va_end(args);
1070     if (phase == PHASE_INITIALIZE)
1071         fprintf(stderr, "%s: %s\n", progname, buf);
1072     syslog(LOG_ERR, "%s", buf);
1073 }
1074
1075 #if 0
1076 /*
1077  * readable - check if a file is readable by the real user.
1078  */
1079 int
1080 readable(fd)
1081     int fd;
1082 {
1083     uid_t uid;
1084     int i;
1085     struct stat sbuf;
1086
1087     uid = getuid();
1088     if (uid == 0)
1089         return 1;
1090     if (fstat(fd, &sbuf) != 0)
1091         return 0;
1092     if (sbuf.st_uid == uid)
1093         return sbuf.st_mode & S_IRUSR;
1094     if (sbuf.st_gid == getgid())
1095         return sbuf.st_mode & S_IRGRP;
1096     for (i = 0; i < ngroups; ++i)
1097         if (sbuf.st_gid == groups[i])
1098             return sbuf.st_mode & S_IRGRP;
1099     return sbuf.st_mode & S_IROTH;
1100 }
1101 #endif
1102
1103 /*
1104  * Read a word from a file.
1105  * Words are delimited by white-space or by quotes (" or ').
1106  * Quotes, white-space and \ may be escaped with \.
1107  * \<newline> is ignored.
1108  */
1109 int
1110 getword(f, word, newlinep, filename)
1111     FILE *f;
1112     char *word;
1113     int *newlinep;
1114     char *filename;
1115 {
1116     int c, len, escape;
1117     int quoted, comment;
1118     int value, digit, got, n;
1119
1120 #define isoctal(c) ((c) >= '0' && (c) < '8')
1121
1122     *newlinep = 0;
1123     len = 0;
1124     escape = 0;
1125     comment = 0;
1126
1127     /*
1128      * First skip white-space and comments.
1129      */
1130     for (;;) {
1131         c = getc(f);
1132         if (c == EOF)
1133             break;
1134
1135         /*
1136          * A newline means the end of a comment; backslash-newline
1137          * is ignored.  Note that we cannot have escape && comment.
1138          */
1139         if (c == '\n') {
1140             if (!escape) {
1141                 *newlinep = 1;
1142                 comment = 0;
1143             } else
1144                 escape = 0;
1145             continue;
1146         }
1147
1148         /*
1149          * Ignore characters other than newline in a comment.
1150          */
1151         if (comment)
1152             continue;
1153
1154         /*
1155          * If this character is escaped, we have a word start.
1156          */
1157         if (escape)
1158             break;
1159
1160         /*
1161          * If this is the escape character, look at the next character.
1162          */
1163         if (c == '\\') {
1164             escape = 1;
1165             continue;
1166         }
1167
1168         /*
1169          * If this is the start of a comment, ignore the rest of the line.
1170          */
1171         if (c == '#') {
1172             comment = 1;
1173             continue;
1174         }
1175
1176         /*
1177          * A non-whitespace character is the start of a word.
1178          */
1179         if (!isspace(c))
1180             break;
1181     }
1182
1183     /*
1184      * Save the delimiter for quoted strings.
1185      */
1186     if (!escape && (c == '"' || c == '\'')) {
1187         quoted = c;
1188         c = getc(f);
1189     } else
1190         quoted = 0;
1191
1192     /*
1193      * Process characters until the end of the word.
1194      */
1195     while (c != EOF) {
1196         if (escape) {
1197             /*
1198              * This character is escaped: backslash-newline is ignored,
1199              * various other characters indicate particular values
1200              * as for C backslash-escapes.
1201              */
1202             escape = 0;
1203             if (c == '\n') {
1204                 c = getc(f);
1205                 continue;
1206             }
1207
1208             got = 0;
1209             switch (c) {
1210             case 'a':
1211                 value = '\a';
1212                 break;
1213             case 'b':
1214                 value = '\b';
1215                 break;
1216             case 'f':
1217                 value = '\f';
1218                 break;
1219             case 'n':
1220                 value = '\n';
1221                 break;
1222             case 'r':
1223                 value = '\r';
1224                 break;
1225             case 's':
1226                 value = ' ';
1227                 break;
1228             case 't':
1229                 value = '\t';
1230                 break;
1231
1232             default:
1233                 if (isoctal(c)) {
1234                     /*
1235                      * \ddd octal sequence
1236                      */
1237                     value = 0;
1238                     for (n = 0; n < 3 && isoctal(c); ++n) {
1239                         value = (value << 3) + (c & 07);
1240                         c = getc(f);
1241                     }
1242                     got = 1;
1243                     break;
1244                 }
1245
1246                 if (c == 'x') {
1247                     /*
1248                      * \x<hex_string> sequence
1249                      */
1250                     value = 0;
1251                     c = getc(f);
1252                     for (n = 0; n < 2 && isxdigit(c); ++n) {
1253                         digit = toupper(c) - '0';
1254                         if (digit > 10)
1255                             digit += '0' + 10 - 'A';
1256                         value = (value << 4) + digit;
1257                         c = getc (f);
1258                     }
1259                     got = 1;
1260                     break;
1261                 }
1262
1263                 /*
1264                  * Otherwise the character stands for itself.
1265                  */
1266                 value = c;
1267                 break;
1268             }
1269
1270             /*
1271              * Store the resulting character for the escape sequence.
1272              */
1273             if (len < MAXWORDLEN-1)
1274                 word[len] = value;
1275             ++len;
1276
1277             if (!got)
1278                 c = getc(f);
1279             continue;
1280
1281         }
1282
1283         /*
1284          * Not escaped: see if we've reached the end of the word.
1285          */
1286         if (quoted) {
1287             if (c == quoted)
1288                 break;
1289         } else {
1290             if (isspace(c) || c == '#') {
1291                 ungetc (c, f);
1292                 break;
1293             }
1294         }
1295
1296         /*
1297          * Backslash starts an escape sequence.
1298          */
1299         if (c == '\\') {
1300             escape = 1;
1301             c = getc(f);
1302             continue;
1303         }
1304
1305         /*
1306          * An ordinary character: store it in the word and get another.
1307          */
1308         if (len < MAXWORDLEN-1)
1309             word[len] = c;
1310         ++len;
1311
1312         c = getc(f);
1313     }
1314
1315     /*
1316      * End of the word: check for errors.
1317      */
1318     if (c == EOF) {
1319         if (ferror(f)) {
1320             if (errno == 0)
1321                 errno = EIO;
1322             option_error("Error reading %s: %m", filename);
1323             die(1);
1324         }
1325         /*
1326          * If len is zero, then we didn't find a word before the
1327          * end of the file.
1328          */
1329         if (len == 0)
1330             return 0;
1331     }
1332
1333     /*
1334      * Warn if the word was too long, and append a terminating null.
1335      */
1336     if (len >= MAXWORDLEN) {
1337         option_error("warning: word in file %s too long (%.20s...)",
1338                      filename, word);
1339         len = MAXWORDLEN - 1;
1340     }
1341     word[len] = 0;
1342
1343     return 1;
1344
1345 #undef isoctal
1346
1347 }
1348
1349 /*
1350  * number_option - parse an unsigned numeric parameter for an option.
1351  */
1352 static int
1353 number_option(str, valp, base)
1354     char *str;
1355     u_int32_t *valp;
1356     int base;
1357 {
1358     char *ptr;
1359
1360     *valp = strtoul(str, &ptr, base);
1361     if (ptr == str) {
1362         option_error("invalid numeric parameter '%s' for %s option",
1363                      str, current_option);
1364         return 0;
1365     }
1366     return 1;
1367 }
1368
1369
1370 /*
1371  * int_option - like number_option, but valp is int *,
1372  * the base is assumed to be 0, and *valp is not changed
1373  * if there is an error.
1374  */
1375 int
1376 int_option(str, valp)
1377     char *str;
1378     int *valp;
1379 {
1380     u_int32_t v;
1381
1382     if (!number_option(str, &v, 0))
1383         return 0;
1384     *valp = (int) v;
1385     return 1;
1386 }
1387
1388
1389 /*
1390  * The following procedures parse options.
1391  */
1392
1393 /*
1394  * readfile - take commands from a file.
1395  */
1396 static int
1397 readfile(argv)
1398     char **argv;
1399 {
1400     return options_from_file(*argv, 1, 1, privileged_option);
1401 }
1402
1403 /*
1404  * callfile - take commands from /etc/ppp/peers/<name>.
1405  * Name may not contain /../, start with / or ../, or end in /..
1406  */
1407 static int
1408 callfile(argv)
1409     char **argv;
1410 {
1411     char *fname, *arg, *p;
1412     int l, ok;
1413
1414     arg = *argv;
1415     ok = 1;
1416     if (arg[0] == '/' || arg[0] == 0)
1417         ok = 0;
1418     else {
1419         for (p = arg; *p != 0; ) {
1420             if (p[0] == '.' && p[1] == '.' && (p[2] == '/' || p[2] == 0)) {
1421                 ok = 0;
1422                 break;
1423             }
1424             while (*p != '/' && *p != 0)
1425                 ++p;
1426             if (*p == '/')
1427                 ++p;
1428         }
1429     }
1430     if (!ok) {
1431         option_error("call option value may not contain .. or start with /");
1432         return 0;
1433     }
1434
1435     l = strlen(arg) + strlen(_PATH_PEERFILES) + 1;
1436     if ((fname = (char *) malloc(l)) == NULL)
1437         novm("call file name");
1438     slprintf(fname, l, "%s%s", _PATH_PEERFILES, arg);
1439
1440     ok = options_from_file(fname, 1, 1, 1);
1441
1442     free(fname);
1443     return ok;
1444 }
1445
1446 #ifdef PPP_FILTER
1447 /*
1448  * setpassfilter - Set the pass filter for packets
1449  */
1450 static int
1451 setpassfilter(argv)
1452     char **argv;
1453 {
1454     pcap_t *pc;
1455     int ret = 1;
1456
1457     pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1458     if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
1459         option_error("error in pass-filter expression: %s\n",
1460                      pcap_geterr(pc));
1461         ret = 0;
1462     }
1463     pcap_close(pc);
1464
1465     return ret;
1466 }
1467
1468 /*
1469  * setactivefilter - Set the active filter for packets
1470  */
1471 static int
1472 setactivefilter(argv)
1473     char **argv;
1474 {
1475     pcap_t *pc;
1476     int ret = 1;
1477
1478     pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1479     if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
1480         option_error("error in active-filter expression: %s\n",
1481                      pcap_geterr(pc));
1482         ret = 0;
1483     }
1484     pcap_close(pc);
1485
1486     return ret;
1487 }
1488 #endif
1489
1490 /*
1491  * setdomain - Set domain name to append to hostname
1492  */
1493 static int
1494 setdomain(argv)
1495     char **argv;
1496 {
1497     gethostname(hostname, MAXNAMELEN);
1498     if (**argv != 0) {
1499         if (**argv != '.')
1500             strncat(hostname, ".", MAXNAMELEN - strlen(hostname));
1501         domain = hostname + strlen(hostname);
1502         strncat(hostname, *argv, MAXNAMELEN - strlen(hostname));
1503     }
1504     hostname[MAXNAMELEN-1] = 0;
1505     return (1);
1506 }
1507
1508 static int
1509 setlogfile(argv)
1510     char **argv;
1511 {
1512     int fd, err;
1513
1514     if (!privileged_option)
1515         seteuid(getuid());
1516     fd = open(*argv, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0644);
1517     if (fd < 0 && errno == EEXIST)
1518         fd = open(*argv, O_WRONLY | O_APPEND);
1519     err = errno;
1520     if (!privileged_option)
1521         seteuid(0);
1522     if (fd < 0) {
1523         errno = err;
1524         option_error("Can't open log file %s: %m", *argv);
1525         return 0;
1526     }
1527     strlcpy(logfile_name, *argv, sizeof(logfile_name));
1528     if (logfile_fd >= 0)
1529         close(logfile_fd);
1530     logfile_fd = fd;
1531     log_to_fd = fd;
1532     log_default = 0;
1533     return 1;
1534 }
1535
1536 #ifdef MAXOCTETS
1537 static int
1538 setmodir(argv)
1539     char **argv;
1540 {
1541     if(*argv == NULL)
1542         return 0;
1543     if(!strcmp(*argv,"in")) {
1544         maxoctets_dir = PPP_OCTETS_DIRECTION_IN;
1545     } else if (!strcmp(*argv,"out")) {
1546         maxoctets_dir = PPP_OCTETS_DIRECTION_OUT;
1547     } else if (!strcmp(*argv,"max")) {
1548         maxoctets_dir = PPP_OCTETS_DIRECTION_MAXOVERAL;
1549     } else {
1550         maxoctets_dir = PPP_OCTETS_DIRECTION_SUM;
1551     }
1552     return 1;
1553 }
1554 #endif
1555
1556 #ifdef PLUGIN
1557 static int
1558 loadplugin(argv)
1559     char **argv;
1560 {
1561     char *arg = *argv;
1562     void *handle;
1563     const char *err;
1564     void (*init) __P((void));
1565     char *path = arg;
1566     const char *vers;
1567
1568     if (strchr(arg, '/') == 0) {
1569         const char *base = _PATH_PLUGIN;
1570         int l = strlen(base) + strlen(arg) + 2;
1571         path = malloc(l);
1572         if (path == 0)
1573             novm("plugin file path");
1574         strlcpy(path, base, l);
1575         strlcat(path, "/", l);
1576         strlcat(path, arg, l);
1577     }
1578     handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
1579     if (handle == 0) {
1580         err = dlerror();
1581         if (err != 0)
1582             option_error("%s", err);
1583         option_error("Couldn't load plugin %s", arg);
1584         goto err;
1585     }
1586     init = (void (*)(void))dlsym(handle, "plugin_init");
1587     if (init == 0) {
1588         option_error("%s has no initialization entry point", arg);
1589         goto errclose;
1590     }
1591     vers = (const char *) dlsym(handle, "pppd_version");
1592     if (vers == 0) {
1593         warn("Warning: plugin %s has no version information", arg);
1594     } else if (strcmp(vers, VERSION) != 0) {
1595         option_error("Plugin %s is for pppd version %s, this is %s",
1596                      arg, vers, VERSION);
1597         goto errclose;
1598     }
1599     info("Plugin %s loaded.", arg);
1600     (*init)();
1601     return 1;
1602
1603  errclose:
1604     dlclose(handle);
1605  err:
1606     if (path != arg)
1607         free(path);
1608     return 0;
1609 }
1610 #endif /* PLUGIN */