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[tomato.git] / release / src / router / ppp / pppd / options.c
blobad386ae504ac96bba87bfe84ec6ccb5aa25bd0cf
1 /*
2 * options.c - handles option processing for PPP.
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: options.c,v 1.1.1.4 2003/10/14 08:09:53 sparq Exp $"
21
22 #include <ctype.h>
23 #include <stdio.h>
24 #include <errno.h>
25 #include <unistd.h>
26 #include <fcntl.h>
27 #include <stdlib.h>
28 #include <syslog.h>
29 #include <string.h>
30 #include <pwd.h>
31 #ifdef PLUGIN
32 #include <dlfcn.h>
33 #endif
34 #ifdef PPP_FILTER
35 #include <pcap.h>
36 #include <pcap-int.h>
37 #endif
38
39 #include "pppd.h"
40 #include "pathnames.h"
41
42 #if defined(ultrix) || defined(NeXT)
43 char *strdup __P((char *));
44 #endif
45
46 static const char rcsid[] = RCSID;
47
48 struct option_value {
49 struct option_value *next;
50 const char *source;
51 char value[1];
52 };
53
54 /*
55 * Option variables and default values.
56 */
57 #ifdef PPP_FILTER
58 int dflag = 0; /* Tell libpcap we want debugging */
59 #endif
60 int debug = 0; /* Debug flag */
61 int kdebugflag = 0; /* Tell kernel to print debug messages */
62 int default_device = 1; /* Using /dev/tty or equivalent */
63 char devnam[MAXPATHLEN]; /* Device name */
64 bool nodetach = 0; /* Don't detach from controlling tty */
65 bool updetach = 0; /* Detach once link is up */
66 int maxconnect = 0; /* Maximum connect time */
67 char user[MAXNAMELEN]; /* Username for PAP */
68 char passwd[MAXSECRETLEN]; /* Password for PAP */
69 bool persist = 0; /* Reopen link after it goes down */
70 char our_name[MAXNAMELEN]; /* Our name for authentication purposes */
71 bool demand = 0; /* do dial-on-demand */
72 char *ipparam = NULL; /* Extra parameter for ip up/down scripts */
73 int idle_time_limit = 0; /* Disconnect if idle for this many seconds */
74 int holdoff = 30; /* # seconds to pause before reconnecting */
75 bool holdoff_specified; /* true if a holdoff value has been given */
76 int log_to_fd = 1; /* send log messages to this fd too */
77 bool log_default = 1; /* log_to_fd is default (stdout) */
78 int maxfail = 10; /* max # of unsuccessful connection attempts */
79 char linkname[MAXPATHLEN]; /* logical name for link */
80 bool tune_kernel; /* may alter kernel settings */
81 int connect_delay = 1000; /* wait this many ms after connect script */
82 int req_unit = -1; /* requested interface unit */
83 bool multilink = 0; /* Enable multilink operation */
84 char *bundle_name = NULL; /* bundle name for multilink */
85 bool dump_options; /* print out option values */
86 bool dryrun; /* print out option values and exit */
87 char *domain; /* domain name set by domain option */
88
89 extern option_t auth_options[];
90 extern struct stat devstat;
91
92 #ifdef PPP_FILTER
93 struct bpf_program pass_filter;/* Filter program for packets to pass */
94 struct bpf_program active_filter; /* Filter program for link-active pkts */
95 pcap_t pc; /* Fake struct pcap so we can compile expr */
96 #endif
97
98 char *current_option; /* the name of the option being parsed */
99 int privileged_option; /* set iff the current option came from root */
100 char *option_source; /* string saying where the option came from */
101 int option_priority = OPRIO_CFGFILE; /* priority of the current options */
102 bool devnam_fixed; /* can no longer change device name */
103
104 static int logfile_fd = -1; /* fd opened for log file */
105 static char logfile_name[MAXPATHLEN]; /* name of log file */
106
107 /*
108 * Prototypes
109 */
110 static int setdomain __P((char **));
111 static int readfile __P((char **));
112 static int callfile __P((char **));
113 static int showversion __P((char **));
114 static int showhelp __P((char **));
115 static void usage __P((void));
116 static int setlogfile __P((char **));
117 #ifdef PLUGIN
118 static int loadplugin __P((char **));
119 #endif
120
121 #ifdef PPP_FILTER
122 static int setpassfilter __P((char **));
123 static int setactivefilter __P((char **));
124 #endif
125
126 static option_t *find_option __P((const char *name));
127 static int process_option __P((option_t *, char *, char **));
128 static int n_arguments __P((option_t *));
129 static int number_option __P((char *, u_int32_t *, int));
130
131 /*
132 * Structure to store extra lists of options.
133 */
134 struct option_list {
135 option_t *options;
136 struct option_list *next;
137 };
138
139 static struct option_list *extra_options = NULL;
140
141 /*
142 * Valid arguments.
143 */
144 option_t general_options[] = {
145 { "debug", o_int, &debug,
146 "Increase debugging level", OPT_INC | OPT_NOARG | 1 },
147 { "-d", o_int, &debug,
148 "Increase debugging level",
149 OPT_ALIAS | OPT_INC | OPT_NOARG | 1 },
150
151 { "kdebug", o_int, &kdebugflag,
152 "Set kernel driver debug level", OPT_PRIO },
153
154 { "nodetach", o_bool, &nodetach,
155 "Don't detach from controlling tty", OPT_PRIO | 1 },
156 { "-detach", o_bool, &nodetach,
157 "Don't detach from controlling tty", OPT_ALIAS | OPT_PRIOSUB | 1 },
158 { "updetach", o_bool, &updetach,
159 "Detach from controlling tty once link is up",
160 OPT_PRIOSUB | OPT_A2CLR | 1, &nodetach },
161
162 { "holdoff", o_int, &holdoff,
163 "Set time in seconds before retrying connection", OPT_PRIO },
164
165 { "idle", o_int, &idle_time_limit,
166 "Set time in seconds before disconnecting idle link", OPT_PRIO },
167
168 { "maxconnect", o_int, &maxconnect,
169 "Set connection time limit",
170 OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
171
172 { "domain", o_special, (void *)setdomain,
173 "Add given domain name to hostname",
174 OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
175
176 { "file", o_special, (void *)readfile,
177 "Take options from a file", OPT_NOPRINT },
178 { "call", o_special, (void *)callfile,
179 "Take options from a privileged file", OPT_NOPRINT },
180
181 { "persist", o_bool, &persist,
182 "Keep on reopening connection after close", OPT_PRIO | 1 },
183 { "nopersist", o_bool, &persist,
184 "Turn off persist option", OPT_PRIOSUB },
185
186 { "demand", o_bool, &demand,
187 "Dial on demand", OPT_INITONLY | 1, &persist },
188
189 { "--version", o_special_noarg, (void *)showversion,
190 "Show version number" },
191 { "--help", o_special_noarg, (void *)showhelp,
192 "Show brief listing of options" },
193 { "-h", o_special_noarg, (void *)showhelp,
194 "Show brief listing of options", OPT_ALIAS },
195
196 { "logfile", o_special, (void *)setlogfile,
197 "Append log messages to this file",
198 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, &logfile_name },
199 { "logfd", o_int, &log_to_fd,
200 "Send log messages to this file descriptor",
201 OPT_PRIOSUB | OPT_A2CLR, &log_default },
202 { "nolog", o_int, &log_to_fd,
203 "Don't send log messages to any file",
204 OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) },
205 { "nologfd", o_int, &log_to_fd,
206 "Don't send log messages to any file descriptor",
207 OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
208
209 { "linkname", o_string, linkname,
210 "Set logical name for link",
211 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
212
213 { "maxfail", o_int, &maxfail,
214 "Maximum number of unsuccessful connection attempts to allow",
215 OPT_PRIO },
216
217 { "ktune", o_bool, &tune_kernel,
218 "Alter kernel settings as necessary", OPT_PRIO | 1 },
219 { "noktune", o_bool, &tune_kernel,
220 "Don't alter kernel settings", OPT_PRIOSUB },
221
222 { "connect-delay", o_int, &connect_delay,
223 "Maximum time (in ms) to wait after connect script finishes",
224 OPT_PRIO },
225
226 { "unit", o_int, &req_unit,
227 "PPP interface unit number to use if possible",
228 OPT_PRIO | OPT_LLIMIT, 0, 0 },
229
230 { "dump", o_bool, &dump_options,
231 "Print out option values after parsing all options", 1 },
232 { "dryrun", o_bool, &dryrun,
233 "Stop after parsing, printing, and checking options", 1 },
234
235 #ifdef HAVE_MULTILINK
236 { "multilink", o_bool, &multilink,
237 "Enable multilink operation", OPT_PRIO | 1 },
238 { "mp", o_bool, &multilink,
239 "Enable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 1 },
240 { "nomultilink", o_bool, &multilink,
241 "Disable multilink operation", OPT_PRIOSUB | 0 },
242 { "nomp", o_bool, &multilink,
243 "Disable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 0 },
244
245 { "bundle", o_string, &bundle_name,
246 "Bundle name for multilink", OPT_PRIO },
247 #endif /* HAVE_MULTILINK */
248
249 #ifdef PLUGIN
250 { "plugin", o_special, (void *)loadplugin,
251 "Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
252 #endif
253
254 #ifdef PPP_FILTER
255 { "pdebug", o_int, &dflag,
256 "libpcap debugging", OPT_PRIO },
257
258 { "pass-filter", 1, setpassfilter,
259 "set filter for packets to pass", OPT_PRIO },
260
261 { "active-filter", 1, setactivefilter,
262 "set filter for active pkts", OPT_PRIO },
263 #endif
264
265 { NULL }
266 };
267
268 #ifndef IMPLEMENTATION
269 #define IMPLEMENTATION ""
270 #endif
271
272 static char *usage_string = "\
273 pppd version %s\n\
274 Usage: %s [ options ], where options are:\n\
275 <device> Communicate over the named device\n\
276 <speed> Set the baud rate to <speed>\n\
277 <loc>:<rem> Set the local and/or remote interface IP\n\
278 addresses. Either one may be omitted.\n\
279 asyncmap <n> Set the desired async map to hex <n>\n\
280 auth Require authentication from peer\n\
281 connect <p> Invoke shell command <p> to set up the serial line\n\
282 crtscts Use hardware RTS/CTS flow control\n\
283 defaultroute Add default route through interface\n\
284 file <f> Take options from file <f>\n\
285 modem Use modem control lines\n\
286 mru <n> Set MRU value to <n> for negotiation\n\
287 See pppd(8) for more options.\n\
288 ";
289
290 /*
291 * parse_args - parse a string of arguments from the command line.
292 */
293 int
294 parse_args(argc, argv)
295 int argc;
296 char **argv;
297 {
298 char *arg;
299 option_t *opt;
300 int n;
301
302 privileged_option = privileged;
303 option_source = "command line";
304 option_priority = OPRIO_CMDLINE;
305 while (argc > 0) {
306 arg = *argv++;
307 --argc;
308 opt = find_option(arg);
309 if (opt == NULL) {
310 option_error("unrecognized option '%s'", arg);
311 usage();
312 return 0;
313 }
314 n = n_arguments(opt);
315 if (argc < n) {
316 option_error("too few parameters for option %s", arg);
317 return 0;
318 }
319 if (!process_option(opt, arg, argv))
320 return 0;
321 argc -= n;
322 argv += n;
323 }
324 return 1;
325 }
326
327 /*
328 * options_from_file - Read a string of options from a file,
329 * and interpret them.
330 */
331 int
332 options_from_file(filename, must_exist, check_prot, priv)
333 char *filename;
334 int must_exist;
335 int check_prot;
336 int priv;
337 {
338 FILE *f;
339 int i, newline, ret, err;
340 option_t *opt;
341 int oldpriv, n;
342 char *oldsource;
343 char *argv[MAXARGS];
344 char args[MAXARGS][MAXWORDLEN];
345 char cmd[MAXWORDLEN];
346
347 if (check_prot)
348 seteuid(getuid());
349 f = fopen(filename, "r");
350 err = errno;
351 if (check_prot)
352 seteuid(0);
353 if (f == NULL) {
354 errno = err;
355 if (!must_exist) {
356 if (err != ENOENT && err != ENOTDIR)
357 warn("Warning: can't open options file %s: %m", filename);
358 return 1;
359 }
360 option_error("Can't open options file %s: %m", filename);
361 return 0;
362 }
363
364 oldpriv = privileged_option;
365 privileged_option = priv;
366 oldsource = option_source;
367 option_source = strdup(filename);
368 if (option_source == NULL)
369 option_source = "file";
370 ret = 0;
371 while (getword(f, cmd, &newline, filename)) {
372 opt = find_option(cmd);
373 if (opt == NULL) {
374 option_error("In file %s: unrecognized option '%s'",
375 filename, cmd);
376 goto err;
377 }
378 n = n_arguments(opt);
379 for (i = 0; i < n; ++i) {
380 if (!getword(f, args[i], &newline, filename)) {
381 option_error(
382 "In file %s: too few parameters for option '%s'",
383 filename, cmd);
384 goto err;
385 }
386 argv[i] = args[i];
387 }
388 if (!process_option(opt, cmd, argv))
389 goto err;
390 }
391 ret = 1;
392
393 err:
394 fclose(f);
395 privileged_option = oldpriv;
396 option_source = oldsource;
397 return ret;
398 }
399
400 /*
401 * options_from_user - See if the use has a ~/.ppprc file,
402 * and if so, interpret options from it.
403 */
404 int
405 options_from_user()
406 {
407 char *user, *path, *file;
408 int ret;
409 struct passwd *pw;
410 size_t pl;
411
412 pw = getpwuid(getuid());
413 if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
414 return 1;
415 file = _PATH_USEROPT;
416 pl = strlen(user) + strlen(file) + 2;
417 path = malloc(pl);
418 if (path == NULL)
419 novm("init file name");
420 slprintf(path, pl, "%s/%s", user, file);
421 option_priority = OPRIO_CFGFILE;
422 ret = options_from_file(path, 0, 1, privileged);
423 free(path);
424 return ret;
425 }
426
427 /*
428 * options_for_tty - See if an options file exists for the serial
429 * device, and if so, interpret options from it.
430 * We only allow the per-tty options file to override anything from
431 * the command line if it is something that the user can't override
432 * once it has been set by root; this is done by giving configuration
433 * files a lower priority than the command line.
434 */
435 int
436 options_for_tty()
437 {
438 char *dev, *path, *p;
439 int ret;
440 size_t pl;
441
442 dev = devnam;
443 if (strncmp(dev, "/dev/", 5) == 0)
444 dev += 5;
445 if (dev[0] == 0 || strcmp(dev, "tty") == 0)
446 return 1; /* don't look for /etc/ppp/options.tty */
447 pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
448 path = malloc(pl);
449 if (path == NULL)
450 novm("tty init file name");
451 slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
452 /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
453 for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
454 if (*p == '/')
455 *p = '.';
456 option_priority = OPRIO_CFGFILE;
457 ret = options_from_file(path, 0, 0, 1);
458 free(path);
459 return ret;
460 }
461
462 /*
463 * options_from_list - process a string of options in a wordlist.
464 */
465 int
466 options_from_list(w, priv)
467 struct wordlist *w;
468 int priv;
469 {
470 char *argv[MAXARGS];
471 option_t *opt;
472 int i, n, ret = 0;
473 struct wordlist *w0;
474
475 privileged_option = priv;
476 option_source = "secrets file";
477 option_priority = OPRIO_SECFILE;
478
479 while (w != NULL) {
480 opt = find_option(w->word);
481 if (opt == NULL) {
482 option_error("In secrets file: unrecognized option '%s'",
483 w->word);
484 goto err;
485 }
486 n = n_arguments(opt);
487 w0 = w;
488 for (i = 0; i < n; ++i) {
489 w = w->next;
490 if (w == NULL) {
491 option_error(
492 "In secrets file: too few parameters for option '%s'",
493 w0->word);
494 goto err;
495 }
496 argv[i] = w->word;
497 }
498 if (!process_option(opt, w0->word, argv))
499 goto err;
500 w = w->next;
501 }
502 ret = 1;
503
504 err:
505 return ret;
506 }
507
508 /*
509 * match_option - see if this option matches an option_t structure.
510 */
511 static int
512 match_option(name, opt, dowild)
513 char *name;
514 option_t *opt;
515 int dowild;
516 {
517 int (*match) __P((char *, char **, int));
518
519 if (dowild != (opt->type == o_wild))
520 return 0;
521 if (!dowild)
522 return strcmp(name, opt->name) == 0;
523 match = (int (*) __P((char *, char **, int))) opt->addr;
524 return (*match)(name, NULL, 0);
525 }
526
527 /*
528 * find_option - scan the option lists for the various protocols
529 * looking for an entry with the given name.
530 * This could be optimized by using a hash table.
531 */
532 static option_t *
533 find_option(name)
534 const char *name;
535 {
536 option_t *opt;
537 struct option_list *list;
538 int i, dowild;
539
540 for (dowild = 0; dowild <= 1; ++dowild) {
541 for (opt = general_options; opt->name != NULL; ++opt)
542 if (match_option(name, opt, dowild))
543 return opt;
544 for (opt = auth_options; opt->name != NULL; ++opt)
545 if (match_option(name, opt, dowild))
546 return opt;
547 for (list = extra_options; list != NULL; list = list->next)
548 for (opt = list->options; opt->name != NULL; ++opt)
549 if (match_option(name, opt, dowild))
550 return opt;
551 for (opt = the_channel->options; opt->name != NULL; ++opt)
552 if (match_option(name, opt, dowild))
553 return opt;
554 for (i = 0; protocols[i] != NULL; ++i)
555 if ((opt = protocols[i]->options) != NULL)
556 for (; opt->name != NULL; ++opt)
557 if (match_option(name, opt, dowild))
558 return opt;
559 }
560 return NULL;
561 }
562
563 /*
564 * process_option - process one new-style option.
565 */
566 static int
567 process_option(opt, cmd, argv)
568 option_t *opt;
569 char *cmd;
570 char **argv;
571 {
572 u_int32_t v;
573 int iv, a;
574 char *sv;
575 int (*parser) __P((char **));
576 int (*wildp) __P((char *, char **, int));
577 char *optopt = (opt->type == o_wild)? "": " option";
578 int prio = option_priority;
579 option_t *mainopt = opt;
580
581 if ((opt->flags & OPT_PRIVFIX) && privileged_option)
582 prio += OPRIO_ROOT;
583 while (mainopt->flags & OPT_PRIOSUB)
584 --mainopt;
585 if (mainopt->flags & OPT_PRIO) {
586 if (prio < mainopt->priority) {
587 /* new value doesn't override old */
588 if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
589 option_error("%s%s set in %s cannot be overridden\n",
590 opt->name, optopt, mainopt->source);
591 return 0;
592 }
593 return 1;
594 }
595 if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
596 warn("%s%s from %s overrides command line",
597 opt->name, optopt, option_source);
598 }
599
600 if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
601 option_error("%s%s cannot be changed after initialization",
602 opt->name, optopt);
603 return 0;
604 }
605 if ((opt->flags & OPT_PRIV) && !privileged_option) {
606 option_error("using the %s%s requires root privilege",
607 opt->name, optopt);
608 return 0;
609 }
610 if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
611 option_error("%s%s is disabled", opt->name, optopt);
612 return 0;
613 }
614 if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
615 option_error("the %s%s may not be changed in %s",
616 opt->name, optopt, option_source);
617 return 0;
618 }
619
620 switch (opt->type) {
621 case o_bool:
622 v = opt->flags & OPT_VALUE;
623 *(bool *)(opt->addr) = v;
624 if (opt->addr2 && (opt->flags & OPT_A2COPY))
625 *(bool *)(opt->addr2) = v;
626 break;
627
628 case o_int:
629 iv = 0;
630 if ((opt->flags & OPT_NOARG) == 0) {
631 if (!int_option(*argv, &iv))
632 return 0;
633 if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
634 || ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
635 && !((opt->flags & OPT_ZEROOK && iv == 0))) {
636 char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
637 switch (opt->flags & OPT_LIMITS) {
638 case OPT_LLIMIT:
639 option_error("%s value must be%s >= %d",
640 opt->name, zok, opt->lower_limit);
641 break;
642 case OPT_ULIMIT:
643 option_error("%s value must be%s <= %d",
644 opt->name, zok, opt->upper_limit);
645 break;
646 case OPT_LIMITS:
647 option_error("%s value must be%s between %d and %d",
648 opt->name, opt->lower_limit, opt->upper_limit);
649 break;
650 }
651 return 0;
652 }
653 }
654 a = opt->flags & OPT_VALUE;
655 if (a >= 128)
656 a -= 256; /* sign extend */
657 iv += a;
658 if (opt->flags & OPT_INC)
659 iv += *(int *)(opt->addr);
660 if ((opt->flags & OPT_NOINCR) && !privileged_option) {
661 int oldv = *(int *)(opt->addr);
662 if ((opt->flags & OPT_ZEROINF) ?
663 (oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
664 option_error("%s value cannot be increased", opt->name);
665 return 0;
666 }
667 }
668 *(int *)(opt->addr) = iv;
669 if (opt->addr2 && (opt->flags & OPT_A2COPY))
670 *(int *)(opt->addr2) = iv;
671 break;
672
673 case o_uint32:
674 if (opt->flags & OPT_NOARG) {
675 v = opt->flags & OPT_VALUE;
676 if (v & 0x80)
677 v |= 0xffffff00U;
678 } else if (!number_option(*argv, &v, 16))
679 return 0;
680 if (opt->flags & OPT_OR)
681 v |= *(u_int32_t *)(opt->addr);
682 *(u_int32_t *)(opt->addr) = v;
683 if (opt->addr2 && (opt->flags & OPT_A2COPY))
684 *(u_int32_t *)(opt->addr2) = v;
685 break;
686
687 case o_string:
688 if (opt->flags & OPT_STATIC) {
689 strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
690 } else {
691 sv = strdup(*argv);
692 if (sv == NULL)
693 novm("option argument");
694 *(char **)(opt->addr) = sv;
695 }
696 break;
697
698 case o_special_noarg:
699 case o_special:
700 parser = (int (*) __P((char **))) opt->addr;
701 if (!(*parser)(argv))
702 return 0;
703 if (opt->flags & OPT_A2LIST) {
704 struct option_value *ovp, **pp;
705
706 ovp = malloc(sizeof(*ovp) + strlen(*argv));
707 if (ovp != 0) {
708 strcpy(ovp->value, *argv);
709 ovp->source = option_source;
710 ovp->next = NULL;
711 pp = (struct option_value **) &opt->addr2;
712 while (*pp != 0)
713 pp = &(*pp)->next;
714 *pp = ovp;
715 }
716 }
717 break;
718
719 case o_wild:
720 wildp = (int (*) __P((char *, char **, int))) opt->addr;
721 if (!(*wildp)(cmd, argv, 1))
722 return 0;
723 break;
724 }
725
726 if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
727 |OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST)) == 0)
728 *(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
729
730 mainopt->source = option_source;
731 mainopt->priority = prio;
732 mainopt->winner = opt - mainopt;
733
734 return 1;
735 }
736
737 /*
738 * override_value - if the option priorities would permit us to
739 * override the value of option, return 1 and update the priority
740 * and source of the option value. Otherwise returns 0.
741 */
742 int
743 override_value(option, priority, source)
744 const char *option;
745 int priority;
746 const char *source;
747 {
748 option_t *opt;
749
750 opt = find_option(option);
751 if (opt == NULL)
752 return 0;
753 while (opt->flags & OPT_PRIOSUB)
754 --opt;
755 if ((opt->flags & OPT_PRIO) && priority < opt->priority)
756 return 0;
757 opt->priority = priority;
758 opt->source = source;
759 opt->winner = -1;
760 return 1;
761 }
762
763 /*
764 * n_arguments - tell how many arguments an option takes
765 */
766 static int
767 n_arguments(opt)
768 option_t *opt;
769 {
770 return (opt->type == o_bool || opt->type == o_special_noarg
771 || (opt->flags & OPT_NOARG))? 0: 1;
772 }
773
774 /*
775 * add_options - add a list of options to the set we grok.
776 */
777 void
778 add_options(opt)
779 option_t *opt;
780 {
781 struct option_list *list;
782
783 list = malloc(sizeof(*list));
784 if (list == 0)
785 novm("option list entry");
786 list->options = opt;
787 list->next = extra_options;
788 extra_options = list;
789 }
790
791 /*
792 * remove_option - permanently remove an option from consideration...
793 * for use by modules to remove choices which no longer make sense.
794 * returns true if found an option
795 */
796 int
797 remove_option(name)
798 char *name;
799 {
800 option_t *o;
801 o = find_option(name);
802 if (o == NULL)
803 return 0;
804 o->name = "";
805 return 1;
806 }
807
808 /*
809 * check_options - check that options are valid and consistent.
810 */
811 void
812 check_options()
813 {
814 if (logfile_fd >= 0 && logfile_fd != log_to_fd)
815 close(logfile_fd);
816 }
817
818 /*
819 * print_option - print out an option and its value
820 */
821 static void
822 print_option(opt, mainopt, printer, arg)
823 option_t *opt, *mainopt;
824 void (*printer) __P((void *, char *, ...));
825 void *arg;
826 {
827 int i, v;
828 char *p;
829
830 if (opt->flags & OPT_NOPRINT)
831 return;
832 switch (opt->type) {
833 case o_bool:
834 v = opt->flags & OPT_VALUE;
835 if (*(bool *)opt->addr != v)
836 /* this can happen legitimately, e.g. lock
837 option turned off for default device */
838 break;
839 printer(arg, "%s", opt->name);
840 break;
841 case o_int:
842 v = opt->flags & OPT_VALUE;
843 if (v >= 128)
844 v -= 256;
845 i = *(int *)opt->addr;
846 if (opt->flags & OPT_NOARG) {
847 printer(arg, "%s", opt->name);
848 if (i != v) {
849 if (opt->flags & OPT_INC) {
850 for (; i > v; i -= v)
851 printer(arg, " %s", opt->name);
852 } else
853 printer(arg, " # oops: %d not %d\n",
854 i, v);
855 }
856 } else {
857 printer(arg, "%s %d", opt->name, i);
858 }
859 break;
860 case o_uint32:
861 printer(arg, "%s", opt->name);
862 if ((opt->flags & OPT_NOARG) == 0)
863 printer(arg, " %x", *(u_int32_t *)opt->addr);
864 break;
865
866 case o_string:
867 if (opt->flags & OPT_HIDE) {
868 p = "??????";
869 } else {
870 p = (char *) opt->addr;
871 if ((opt->flags & OPT_STATIC) == 0)
872 p = *(char **)p;
873 }
874 printer(arg, "%s %q", opt->name, p);
875 break;
876
877 case o_special:
878 case o_special_noarg:
879 case o_wild:
880 if (opt->type != o_wild) {
881 printer(arg, "%s", opt->name);
882 if (n_arguments(opt) == 0)
883 break;
884 printer(arg, " ");
885 }
886 if (opt->flags & OPT_A2PRINTER) {
887 void (*oprt) __P((option_t *,
888 void ((*)__P((void *, char *, ...))),
889 void *));
890 oprt = opt->addr2;
891 (*oprt)(opt, printer, arg);
892 } else if (opt->flags & OPT_A2STRVAL) {
893 p = (char *) opt->addr2;
894 if ((opt->flags & OPT_STATIC) == 0)
895 p = *(char **)p;
896 printer("%q", p);
897 } else if (opt->flags & OPT_A2LIST) {
898 struct option_value *ovp;
899
900 ovp = (struct option_value *) opt->addr2;
901 for (;;) {
902 printer(arg, "%q", ovp->value);
903 if ((ovp = ovp->next) == NULL)
904 break;
905 printer(arg, "\t\t# (from %s)\n%s ",
906 ovp->source, opt->name);
907 }
908 } else {
909 printer(arg, "xxx # [don't know how to print value]");
910 }
911 break;
912
913 default:
914 printer(arg, "# %s value (type %d??)", opt->name, opt->type);
915 break;
916 }
917 printer(arg, "\t\t# (from %s)\n", mainopt->source);
918 }
919
920 /*
921 * print_option_list - print out options in effect from an
922 * array of options.
923 */
924 static void
925 print_option_list(opt, printer, arg)
926 option_t *opt;
927 void (*printer) __P((void *, char *, ...));
928 void *arg;
929 {
930 while (opt->name != NULL) {
931 if (opt->priority != OPRIO_DEFAULT
932 && opt->winner != (short int) -1)
933 print_option(opt + opt->winner, opt, printer, arg);
934 do {
935 ++opt;
936 } while (opt->flags & OPT_PRIOSUB);
937 }
938 }
939
940 /*
941 * print_options - print out what options are in effect.
942 */
943 void
944 print_options(printer, arg)
945 void (*printer) __P((void *, char *, ...));
946 void *arg;
947 {
948 struct option_list *list;
949 int i;
950
951 printer(arg, "pppd options in effect:\n");
952 print_option_list(general_options, printer, arg);
953 print_option_list(auth_options, printer, arg);
954 for (list = extra_options; list != NULL; list = list->next)
955 print_option_list(list->options, printer, arg);
956 print_option_list(the_channel->options, printer, arg);
957 for (i = 0; protocols[i] != NULL; ++i)
958 print_option_list(protocols[i]->options, printer, arg);
959 }
960
961 /*
962 * usage - print out a message telling how to use the program.
963 */
964 static void
965 usage()
966 {
967 if (phase == PHASE_INITIALIZE)
968 fprintf(stderr, usage_string, VERSION, progname);
969 }
970
971 /*
972 * showhelp - print out usage message and exit.
973 */
974 static int
975 showhelp(argv)
976 char **argv;
977 {
978 if (phase == PHASE_INITIALIZE) {
979 usage();
980 exit(0);
981 }
982 return 0;
983 }
984
985 /*
986 * showversion - print out the version number and exit.
987 */
988 static int
989 showversion(argv)
990 char **argv;
991 {
992 if (phase == PHASE_INITIALIZE) {
993 fprintf(stderr, "pppd version %s\n", VERSION);
994 exit(0);
995 }
996 return 0;
997 }
998
999 /*
1000 * option_error - print a message about an error in an option.
1001 * The message is logged, and also sent to
1002 * stderr if phase == PHASE_INITIALIZE.
1003 */
1004 void
1005 option_error __V((char *fmt, ...))
1006 {
1007 va_list args;
1008 char buf[1024];
1009
1010 #if defined(__STDC__)
1011 va_start(args, fmt);
1012 #else
1013 char *fmt;
1014 va_start(args);
1015 fmt = va_arg(args, char *);
1016 #endif
1017 vslprintf(buf, sizeof(buf), fmt, args);
1018 va_end(args);
1019 if (phase == PHASE_INITIALIZE)
1020 fprintf(stderr, "%s: %s\n", progname, buf);
1021 syslog(LOG_ERR, "%s", buf);
1022 }
1023
1024
1025 /*
1026 * Read a word from a file.
1027 * Words are delimited by white-space or by quotes (" or ').
1028 * Quotes, white-space and \ may be escaped with \.
1029 * \<newline> is ignored.
1030 */
1031 int
1032 getword(f, word, newlinep, filename)
1033 FILE *f;
1034 char *word;
1035 int *newlinep;
1036 char *filename;
1037 {
1038 int c, len, escape;
1039 int quoted, comment;
1040 int value, digit, got, n;
1041
1042 #define isoctal(c) ((c) >= '0' && (c) < '8')
1043
1044 *newlinep = 0;
1045 len = 0;
1046 escape = 0;
1047 comment = 0;
1048
1049 /*
1050 * First skip white-space and comments.
1051 */
1052 for (;;) {
1053 c = getc(f);
1054 if (c == EOF)
1055 break;
1056
1057 /*
1058 * A newline means the end of a comment; backslash-newline
1059 * is ignored. Note that we cannot have escape && comment.
1060 */
1061 if (c == '\n') {
1062 if (!escape) {
1063 *newlinep = 1;
1064 comment = 0;
1065 } else
1066 escape = 0;
1067 continue;
1068 }
1069
1070 /*
1071 * Ignore characters other than newline in a comment.
1072 */
1073 if (comment)
1074 continue;
1075
1076 /*
1077 * If this character is escaped, we have a word start.
1078 */
1079 if (escape)
1080 break;
1081
1082 /*
1083 * If this is the escape character, look at the next character.
1084 */
1085 if (c == '\\') {
1086 escape = 1;
1087 continue;
1088 }
1089
1090 /*
1091 * If this is the start of a comment, ignore the rest of the line.
1092 */
1093 if (c == '#') {
1094 comment = 1;
1095 continue;
1096 }
1097
1098 /*
1099 * A non-whitespace character is the start of a word.
1100 */
1101 if (!isspace(c))
1102 break;
1103 }
1104
1105 /*
1106 * Save the delimiter for quoted strings.
1107 */
1108 if (!escape && (c == '"' || c == '\'')) {
1109 quoted = c;
1110 c = getc(f);
1111 } else
1112 quoted = 0;
1113
1114 /*
1115 * Process characters until the end of the word.
1116 */
1117 while (c != EOF) {
1118 if (escape) {
1119 /*
1120 * This character is escaped: backslash-newline is ignored,
1121 * various other characters indicate particular values
1122 * as for C backslash-escapes.
1123 */
1124 escape = 0;
1125 if (c == '\n') {
1126 c = getc(f);
1127 continue;
1128 }
1129
1130 got = 0;
1131 switch (c) {
1132 case 'a':
1133 value = '\a';
1134 break;
1135 case 'b':
1136 value = '\b';
1137 break;
1138 case 'f':
1139 value = '\f';
1140 break;
1141 case 'n':
1142 value = '\n';
1143 break;
1144 case 'r':
1145 value = '\r';
1146 break;
1147 case 's':
1148 value = ' ';
1149 break;
1150 case 't':
1151 value = '\t';
1152 break;
1153
1154 default:
1155 if (isoctal(c)) {
1156 /*
1157 * \ddd octal sequence
1158 */
1159 value = 0;
1160 for (n = 0; n < 3 && isoctal(c); ++n) {
1161 value = (value << 3) + (c & 07);
1162 c = getc(f);
1163 }
1164 got = 1;
1165 break;
1166 }
1167
1168 if (c == 'x') {
1169 /*
1170 * \x<hex_string> sequence
1171 */
1172 value = 0;
1173 c = getc(f);
1174 for (n = 0; n < 2 && isxdigit(c); ++n) {
1175 digit = toupper(c) - '0';
1176 if (digit > 10)
1177 digit += '0' + 10 - 'A';
1178 value = (value << 4) + digit;
1179 c = getc (f);
1180 }
1181 got = 1;
1182 break;
1183 }
1184
1185 /*
1186 * Otherwise the character stands for itself.
1187 */
1188 value = c;
1189 break;
1190 }
1191
1192 /*
1193 * Store the resulting character for the escape sequence.
1194 */
1195 if (len < MAXWORDLEN-1)
1196 word[len] = value;
1197 ++len;
1198
1199 if (!got)
1200 c = getc(f);
1201 continue;
1202
1203 }
1204
1205 /*
1206 * Not escaped: see if we've reached the end of the word.
1207 */
1208 if (quoted) {
1209 if (c == quoted)
1210 break;
1211 } else {
1212 if (isspace(c) || c == '#') {
1213 ungetc (c, f);
1214 break;
1215 }
1216 }
1217
1218 /*
1219 * Backslash starts an escape sequence.
1220 */
1221 if (c == '\\') {
1222 escape = 1;
1223 c = getc(f);
1224 continue;
1225 }
1226
1227 /*
1228 * An ordinary character: store it in the word and get another.
1229 */
1230 if (len < MAXWORDLEN-1)
1231 word[len] = c;
1232 ++len;
1233
1234 c = getc(f);
1235 }
1236
1237 /*
1238 * End of the word: check for errors.
1239 */
1240 if (c == EOF) {
1241 if (ferror(f)) {
1242 if (errno == 0)
1243 errno = EIO;
1244 option_error("Error reading %s: %m", filename);
1245 die(1);
1246 }
1247 /*
1248 * If len is zero, then we didn't find a word before the
1249 * end of the file.
1250 */
1251 if (len == 0)
1252 return 0;
1253 }
1254
1255 /*
1256 * Warn if the word was too long, and append a terminating null.
1257 */
1258 if (len >= MAXWORDLEN) {
1259 option_error("warning: word in file %s too long (%.20s...)",
1260 filename, word);
1261 len = MAXWORDLEN - 1;
1262 }
1263 word[len] = 0;
1264
1265 return 1;
1266
1267 #undef isoctal
1268
1269 }
1270
1271 /*
1272 * number_option - parse an unsigned numeric parameter for an option.
1273 */
1274 static int
1275 number_option(str, valp, base)
1276 char *str;
1277 u_int32_t *valp;
1278 int base;
1279 {
1280 char *ptr;
1281
1282 *valp = strtoul(str, &ptr, base);
1283 if (ptr == str) {
1284 option_error("invalid numeric parameter '%s' for %s option",
1285 str, current_option);
1286 return 0;
1287 }
1288 return 1;
1289 }
1290
1291
1292 /*
1293 * int_option - like number_option, but valp is int *,
1294 * the base is assumed to be 0, and *valp is not changed
1295 * if there is an error.
1296 */
1297 int
1298 int_option(str, valp)
1299 char *str;
1300 int *valp;
1301 {
1302 u_int32_t v;
1303
1304 if (!number_option(str, &v, 0))
1305 return 0;
1306 *valp = (int) v;
1307 return 1;
1308 }
1309
1310
1311 /*
1312 * The following procedures parse options.
1313 */
1314
1315 /*
1316 * readfile - take commands from a file.
1317 */
1318 static int
1319 readfile(argv)
1320 char **argv;
1321 {
1322 return options_from_file(*argv, 1, 1, privileged_option);
1323 }
1324
1325 /*
1326 * callfile - take commands from /etc/ppp/peers/<name>.
1327 * Name may not contain /../, start with / or ../, or end in /..
1328 */
1329 static int
1330 callfile(argv)
1331 char **argv;
1332 {
1333 char *fname, *arg, *p;
1334 int l, ok;
1335
1336 arg = *argv;
1337 ok = 1;
1338 if (arg[0] == '/' || arg[0] == 0)
1339 ok = 0;
1340 else {
1341 for (p = arg; *p != 0; ) {
1342 if (p[0] == '.' && p[1] == '.' && (p[2] == '/' || p[2] == 0)) {
1343 ok = 0;
1344 break;
1345 }
1346 while (*p != '/' && *p != 0)
1347 ++p;
1348 if (*p == '/')
1349 ++p;
1350 }
1351 }
1352 if (!ok) {
1353 option_error("call option value may not contain .. or start with /");
1354 return 0;
1355 }
1356
1357 l = strlen(arg) + strlen(_PATH_PEERFILES) + 1;
1358 if ((fname = (char *) malloc(l)) == NULL)
1359 novm("call file name");
1360 slprintf(fname, l, "%s%s", _PATH_PEERFILES, arg);
1361
1362 ok = options_from_file(fname, 1, 1, 1);
1363
1364 free(fname);
1365 return ok;
1366 }
1367
1368 #ifdef PPP_FILTER
1369 /*
1370 * setpassfilter - Set the pass filter for packets
1371 */
1372 static int
1373 setpassfilter(argv)
1374 char **argv;
1375 {
1376 pc.linktype = DLT_PPP;
1377 pc.snapshot = PPP_HDRLEN;
1378
1379 if (pcap_compile(&pc, &pass_filter, *argv, 1, netmask) == 0)
1380 return 1;
1381 option_error("error in pass-filter expression: %s\n", pcap_geterr(&pc));
1382 return 0;
1383 }
1384
1385 /*
1386 * setactivefilter - Set the active filter for packets
1387 */
1388 static int
1389 setactivefilter(argv)
1390 char **argv;
1391 {
1392 pc.linktype = DLT_PPP;
1393 pc.snapshot = PPP_HDRLEN;
1394
1395 if (pcap_compile(&pc, &active_filter, *argv, 1, netmask) == 0)
1396 return 1;
1397 option_error("error in active-filter expression: %s\n", pcap_geterr(&pc));
1398 return 0;
1399 }
1400 #endif
1401
1402 /*
1403 * setdomain - Set domain name to append to hostname
1404 */
1405 static int
1406 setdomain(argv)
1407 char **argv;
1408 {
1409 gethostname(hostname, MAXNAMELEN);
1410 if (**argv != 0) {
1411 if (**argv != '.')
1412 strncat(hostname, ".", MAXNAMELEN - strlen(hostname));
1413 domain = hostname + strlen(hostname);
1414 strncat(hostname, *argv, MAXNAMELEN - strlen(hostname));
1415 }
1416 hostname[MAXNAMELEN-1] = 0;
1417 return (1);
1418 }
1419
1420
1421 static int
1422 setlogfile(argv)
1423 char **argv;
1424 {
1425 int fd, err;
1426
1427 if (!privileged_option)
1428 seteuid(getuid());
1429 fd = open(*argv, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0644);
1430 if (fd < 0 && errno == EEXIST)
1431 fd = open(*argv, O_WRONLY | O_APPEND);
1432 err = errno;
1433 if (!privileged_option)
1434 seteuid(0);
1435 if (fd < 0) {
1436 errno = err;
1437 option_error("Can't open log file %s: %m", *argv);
1438 return 0;
1439 }
1440 strlcpy(logfile_name, *argv, sizeof(logfile_name));
1441 if (logfile_fd >= 0)
1442 close(logfile_fd);
1443 logfile_fd = fd;
1444 log_to_fd = fd;
1445 log_default = 0;
1446 return 1;
1447 }
1448
1449 #ifdef PLUGIN
1450 static int
1451 loadplugin(argv)
1452 char **argv;
1453 {
1454 char *arg = *argv;
1455 void *handle;
1456 const char *err;
1457 void (*init) __P((void));
1458 char *path = arg;
1459 const char *vers;
1460
1461 if (strchr(arg, '/') == 0) {
1462 const char *base = _PATH_PLUGIN;
1463 int l = strlen(base) + strlen(arg) + 2;
1464 path = malloc(l);
1465 if (path == 0)
1466 novm("plugin file path");
1467 strlcpy(path, base, l);
1468 strlcat(path, "/", l);
1469 strlcat(path, arg, l);
1470 }
1471 handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
1472 if (handle == 0) {
1473 err = dlerror();
1474 if (err != 0)
1475 option_error("%s", err);
1476 option_error("Couldn't load plugin %s", arg);
1477 goto err;
1478 }
1479 init = (void (*)(void))dlsym(handle, "plugin_init");
1480 if (init == 0) {
1481 option_error("%s has no initialization entry point", arg);
1482 goto errclose;
1483 }
1484 vers = (const char *) dlsym(handle, "pppd_version");
1485 if (vers == 0) {
1486 warn("Warning: plugin %s has no version information", arg);
1487 } else if (strcmp(vers, VERSION) != 0) {
1488 option_error("Plugin %s is for pppd version %s, this is %s",
1489 vers, VERSION);
1490 goto errclose;
1491 }
1492 info("Plugin %s loaded.", arg);
1493 (*init)();
1494 return 1;
1495
1496 errclose:
1497 dlclose(handle);
1498 err:
1499 if (path != arg)
1500 free(path);
1501 return 0;
1502 }
1503 #endif /* PLUGIN */
Tomato firmware and modifications.