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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 1.95 2004/11/09 22:33:35 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 /*
62  * DLT_PPP_WITH_DIRECTION is in current libpcap cvs, and should be in
63  * libpcap-0.8.4.  Until that is released, use DLT_PPP - but that means
64  * we lose the inbound and outbound qualifiers.
65  */
66 #ifndef DLT_PPP_WITH_DIRECTION
67 #define DLT_PPP_WITH_DIRECTION	DLT_PPP
68 #endif
69 #endif
70 
71 #include "pppd.h"
72 #include "pathnames.h"
73 
74 #if defined(ultrix) || defined(NeXT)
75 char *strdup __P((char *));
76 #endif
77 
78 static const char rcsid[] = RCSID;
79 
80 struct option_value {
81     struct option_value *next;
82     const char *source;
83     char value[1];
84 };
85 
86 /*
87  * Option variables and default values.
88  */
89 int	debug = 0;		/* Debug flag */
90 int	kdebugflag = 0;		/* Tell kernel to print debug messages */
91 int	default_device = 1;	/* Using /dev/tty or equivalent */
92 char	devnam[MAXPATHLEN];	/* Device name */
93 bool	nodetach = 0;		/* Don't detach from controlling tty */
94 bool	updetach = 0;		/* Detach once link is up */
95 int	maxconnect = 0;		/* Maximum connect time */
96 char	user[MAXNAMELEN];	/* Username for PAP */
97 char	passwd[MAXSECRETLEN];	/* Password for PAP */
98 bool	persist = 0;		/* Reopen link after it goes down */
99 char	our_name[MAXNAMELEN];	/* Our name for authentication purposes */
100 bool	demand = 0;		/* do dial-on-demand */
101 char	*ipparam = NULL;	/* Extra parameter for ip up/down scripts */
102 int	idle_time_limit = 0;	/* Disconnect if idle for this many seconds */
103 int	holdoff = 30;		/* # seconds to pause before reconnecting */
104 bool	holdoff_specified;	/* true if a holdoff value has been given */
105 int	log_to_fd = 1;		/* send log messages to this fd too */
106 bool	log_default = 1;	/* log_to_fd is default (stdout) */
107 int	maxfail = 10;		/* max # of unsuccessful connection attempts */
108 char	linkname[MAXPATHLEN];	/* logical name for link */
109 bool	tune_kernel;		/* may alter kernel settings */
110 int	connect_delay = 1000;	/* wait this many ms after connect script */
111 int	req_unit = -1;		/* requested interface unit */
112 bool	multilink = 0;		/* Enable multilink operation */
113 char	*bundle_name = NULL;	/* bundle name for multilink */
114 bool	dump_options;		/* print out option values */
115 bool	dryrun;			/* print out option values and exit */
116 char	*domain;		/* domain name set by domain option */
117 int	child_wait = 5;		/* # seconds to wait for children at exit */
118 
119 #ifdef MAXOCTETS
120 unsigned int  maxoctets = 0;    /* default - no limit */
121 int maxoctets_dir = 0;       /* default - sum of traffic */
122 int maxoctets_timeout = 1;   /* default 1 second */
123 #endif
124 
125 
126 extern option_t auth_options[];
127 extern struct stat devstat;
128 
129 #ifdef PPP_FILTER
130 struct	bpf_program pass_filter;/* Filter program for packets to pass */
131 struct	bpf_program active_filter; /* Filter program for link-active pkts */
132 #endif
133 
134 char *current_option;		/* the name of the option being parsed */
135 int  privileged_option;		/* set iff the current option came from root */
136 char *option_source;		/* string saying where the option came from */
137 int  option_priority = OPRIO_CFGFILE; /* priority of the current options */
138 bool devnam_fixed;		/* can no longer change device name */
139 
140 static int logfile_fd = -1;	/* fd opened for log file */
141 static char logfile_name[MAXPATHLEN];	/* name of log file */
142 
143 /*
144  * Prototypes
145  */
146 static int setdomain __P((char **));
147 static int readfile __P((char **));
148 static int callfile __P((char **));
149 static int showversion __P((char **));
150 static int showhelp __P((char **));
151 static void usage __P((void));
152 static int setlogfile __P((char **));
153 #ifdef PLUGIN
154 static int loadplugin __P((char **));
155 #endif
156 
157 #ifdef PPP_FILTER
158 static int setpassfilter __P((char **));
159 static int setactivefilter __P((char **));
160 #endif
161 
162 #ifdef MAXOCTETS
163 static int setmodir __P((char **));
164 #endif
165 
166 static option_t *find_option __P((const char *name));
167 static int process_option __P((option_t *, char *, char **));
168 static int n_arguments __P((option_t *));
169 static int number_option __P((char *, u_int32_t *, int));
170 
171 /*
172  * Structure to store extra lists of options.
173  */
174 struct option_list {
175     option_t *options;
176     struct option_list *next;
177 };
178 
179 static struct option_list *extra_options = NULL;
180 
181 /*
182  * Valid arguments.
183  */
184 option_t general_options[] = {
185     { "debug", o_int, &debug,
186       "Increase debugging level", OPT_INC | OPT_NOARG | 1 },
187     { "-d", o_int, &debug,
188       "Increase debugging level",
189       OPT_ALIAS | OPT_INC | OPT_NOARG | 1 },
190 
191     { "kdebug", o_int, &kdebugflag,
192       "Set kernel driver debug level", OPT_PRIO },
193 
194     { "nodetach", o_bool, &nodetach,
195       "Don't detach from controlling tty", OPT_PRIO | 1 },
196     { "-detach", o_bool, &nodetach,
197       "Don't detach from controlling tty", OPT_ALIAS | OPT_PRIOSUB | 1 },
198     { "updetach", o_bool, &updetach,
199       "Detach from controlling tty once link is up",
200       OPT_PRIOSUB | OPT_A2CLR | 1, &nodetach },
201 
202     { "holdoff", o_int, &holdoff,
203       "Set time in seconds before retrying connection",
204       OPT_PRIO, &holdoff_specified },
205 
206     { "idle", o_int, &idle_time_limit,
207       "Set time in seconds before disconnecting idle link", OPT_PRIO },
208 
209     { "maxconnect", o_int, &maxconnect,
210       "Set connection time limit",
211       OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
212 
213     { "domain", o_special, (void *)setdomain,
214       "Add given domain name to hostname",
215       OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
216 
217     { "file", o_special, (void *)readfile,
218       "Take options from a file", OPT_NOPRINT },
219     { "call", o_special, (void *)callfile,
220       "Take options from a privileged file", OPT_NOPRINT },
221 
222     { "persist", o_bool, &persist,
223       "Keep on reopening connection after close", OPT_PRIO | 1 },
224     { "nopersist", o_bool, &persist,
225       "Turn off persist option", OPT_PRIOSUB },
226 
227     { "demand", o_bool, &demand,
228       "Dial on demand", OPT_INITONLY | 1, &persist },
229 
230     { "--version", o_special_noarg, (void *)showversion,
231       "Show version number" },
232     { "--help", o_special_noarg, (void *)showhelp,
233       "Show brief listing of options" },
234     { "-h", o_special_noarg, (void *)showhelp,
235       "Show brief listing of options", OPT_ALIAS },
236 
237     { "logfile", o_special, (void *)setlogfile,
238       "Append log messages to this file",
239       OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, &logfile_name },
240     { "logfd", o_int, &log_to_fd,
241       "Send log messages to this file descriptor",
242       OPT_PRIOSUB | OPT_A2CLR, &log_default },
243     { "nolog", o_int, &log_to_fd,
244       "Don't send log messages to any file",
245       OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) },
246     { "nologfd", o_int, &log_to_fd,
247       "Don't send log messages to any file descriptor",
248       OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
249 
250     { "linkname", o_string, linkname,
251       "Set logical name for link",
252       OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
253 
254     { "maxfail", o_int, &maxfail,
255       "Maximum number of unsuccessful connection attempts to allow",
256       OPT_PRIO },
257 
258     { "ktune", o_bool, &tune_kernel,
259       "Alter kernel settings as necessary", OPT_PRIO | 1 },
260     { "noktune", o_bool, &tune_kernel,
261       "Don't alter kernel settings", OPT_PRIOSUB },
262 
263     { "connect-delay", o_int, &connect_delay,
264       "Maximum time (in ms) to wait after connect script finishes",
265       OPT_PRIO },
266 
267     { "unit", o_int, &req_unit,
268       "PPP interface unit number to use if possible",
269       OPT_PRIO | OPT_LLIMIT, 0, 0 },
270 
271     { "dump", o_bool, &dump_options,
272       "Print out option values after parsing all options", 1 },
273     { "dryrun", o_bool, &dryrun,
274       "Stop after parsing, printing, and checking options", 1 },
275 
276     { "child-timeout", o_int, &child_wait,
277       "Number of seconds to wait for child processes at exit",
278       OPT_PRIO },
279 
280 #ifdef HAVE_MULTILINK
281     { "multilink", o_bool, &multilink,
282       "Enable multilink operation", OPT_PRIO | 1 },
283     { "mp", o_bool, &multilink,
284       "Enable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 1 },
285     { "nomultilink", o_bool, &multilink,
286       "Disable multilink operation", OPT_PRIOSUB | 0 },
287     { "nomp", o_bool, &multilink,
288       "Disable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 0 },
289 
290     { "bundle", o_string, &bundle_name,
291       "Bundle name for multilink", OPT_PRIO },
292 #endif /* HAVE_MULTILINK */
293 
294 #ifdef PLUGIN
295     { "plugin", o_special, (void *)loadplugin,
296       "Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
297 #endif
298 
299 #ifdef PPP_FILTER
300     { "pass-filter", 1, setpassfilter,
301       "set filter for packets to pass", OPT_PRIO },
302 
303     { "active-filter", 1, setactivefilter,
304       "set filter for active pkts", OPT_PRIO },
305 #endif
306 
307 #ifdef MAXOCTETS
308     { "maxoctets", o_int, &maxoctets,
309       "Set connection traffic limit",
310       OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
311     { "mo", o_int, &maxoctets,
312       "Set connection traffic limit",
313       OPT_ALIAS | OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
314     { "mo-direction", o_special, setmodir,
315       "Set direction for limit traffic (sum,in,out,max)" },
316     { "mo-timeout", o_int, &maxoctets_timeout,
317       "Check for traffic limit every N seconds", OPT_PRIO | OPT_LLIMIT | 1 },
318 #endif
319 
320     { NULL }
321 };
322 
323 #ifndef IMPLEMENTATION
324 #define IMPLEMENTATION ""
325 #endif
326 
327 static char *usage_string = "\
328 pppd version %s\n\
329 Usage: %s [ options ], where options are:\n\
330 	<device>	Communicate over the named device\n\
331 	<speed>		Set the baud rate to <speed>\n\
332 	<loc>:<rem>	Set the local and/or remote interface IP\n\
333 			addresses.  Either one may be omitted.\n\
334 	asyncmap <n>	Set the desired async map to hex <n>\n\
335 	auth		Require authentication from peer\n\
336         connect <p>     Invoke shell command <p> to set up the serial line\n\
337 	crtscts		Use hardware RTS/CTS flow control\n\
338 	defaultroute	Add default route through interface\n\
339 	file <f>	Take options from file <f>\n\
340 	modem		Use modem control lines\n\
341 	mru <n>		Set MRU value to <n> for negotiation\n\
342 See pppd(8) for more options.\n\
343 ";
344 
345 /*
346  * parse_args - parse a string of arguments from the command line.
347  */
348 int
parse_args(argc,argv)349 parse_args(argc, argv)
350     int argc;
351     char **argv;
352 {
353     char *arg;
354     option_t *opt;
355     int n;
356 
357     privileged_option = privileged;
358     option_source = "command line";
359     option_priority = OPRIO_CMDLINE;
360     while (argc > 0) {
361 	arg = *argv++;
362 	--argc;
363 	opt = find_option(arg);
364 	if (opt == NULL) {
365 	    option_error("unrecognized option '%s'", arg);
366 	    usage();
367 	    return 0;
368 	}
369 	n = n_arguments(opt);
370 	if (argc < n) {
371 	    option_error("too few parameters for option %s", arg);
372 	    return 0;
373 	}
374 	if (!process_option(opt, arg, argv))
375 	    return 0;
376 	argc -= n;
377 	argv += n;
378     }
379     return 1;
380 }
381 
382 /*
383  * options_from_file - Read a string of options from a file,
384  * and interpret them.
385  */
386 int
options_from_file(filename,must_exist,check_prot,priv)387 options_from_file(filename, must_exist, check_prot, priv)
388     char *filename;
389     int must_exist;
390     int check_prot;
391     int priv;
392 {
393     FILE *f;
394     int i, newline, ret, err;
395     option_t *opt;
396     int oldpriv, n;
397     char *oldsource;
398     char *argv[MAXARGS];
399     char args[MAXARGS][MAXWORDLEN];
400     char cmd[MAXWORDLEN];
401 
402     if (check_prot)
403 	seteuid(getuid());
404     f = fopen(filename, "r");
405     err = errno;
406     if (check_prot)
407 	seteuid(0);
408     if (f == NULL) {
409 	errno = err;
410 	if (!must_exist) {
411 	    if (err != ENOENT && err != ENOTDIR)
412 		warn("Warning: can't open options file %s: %m", filename);
413 	    return 1;
414 	}
415 	option_error("Can't open options file %s: %m", filename);
416 	return 0;
417     }
418 
419     oldpriv = privileged_option;
420     privileged_option = priv;
421     oldsource = option_source;
422     option_source = strdup(filename);
423     if (option_source == NULL)
424 	option_source = "file";
425     ret = 0;
426     while (getword(f, cmd, &newline, filename)) {
427 	opt = find_option(cmd);
428 	if (opt == NULL) {
429 	    option_error("In file %s: unrecognized option '%s'",
430 			 filename, cmd);
431 	    goto err;
432 	}
433 	n = n_arguments(opt);
434 	for (i = 0; i < n; ++i) {
435 	    if (!getword(f, args[i], &newline, filename)) {
436 		option_error(
437 			"In file %s: too few parameters for option '%s'",
438 			filename, cmd);
439 		goto err;
440 	    }
441 	    argv[i] = args[i];
442 	}
443 	if (!process_option(opt, cmd, argv))
444 	    goto err;
445     }
446     ret = 1;
447 
448 err:
449     fclose(f);
450     privileged_option = oldpriv;
451     option_source = oldsource;
452     return ret;
453 }
454 
455 /*
456  * options_from_user - See if the use has a ~/.ppprc file,
457  * and if so, interpret options from it.
458  */
459 int
options_from_user()460 options_from_user()
461 {
462     char *user, *path, *file;
463     int ret;
464     struct passwd *pw;
465     size_t pl;
466 
467     pw = getpwuid(getuid());
468     if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
469 	return 1;
470     file = _PATH_USEROPT;
471     pl = strlen(user) + strlen(file) + 2;
472     path = malloc(pl);
473     if (path == NULL)
474 	novm("init file name");
475     slprintf(path, pl, "%s/%s", user, file);
476     option_priority = OPRIO_CFGFILE;
477     ret = options_from_file(path, 0, 1, privileged);
478     free(path);
479     return ret;
480 }
481 
482 /*
483  * options_for_tty - See if an options file exists for the serial
484  * device, and if so, interpret options from it.
485  * We only allow the per-tty options file to override anything from
486  * the command line if it is something that the user can't override
487  * once it has been set by root; this is done by giving configuration
488  * files a lower priority than the command line.
489  */
490 int
options_for_tty()491 options_for_tty()
492 {
493     char *dev, *path, *p;
494     int ret;
495     size_t pl;
496 
497     dev = devnam;
498     if ((p = strstr(dev, "/dev/")) != NULL)
499 	dev = p + 5;
500     if (dev[0] == 0 || strcmp(dev, "tty") == 0)
501 	return 1;		/* don't look for /etc/ppp/options.tty */
502     pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
503     path = malloc(pl);
504     if (path == NULL)
505 	novm("tty init file name");
506     slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
507     /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
508     for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
509 	if (*p == '/')
510 	    *p = '.';
511     option_priority = OPRIO_CFGFILE;
512     ret = options_from_file(path, 0, 0, 1);
513     free(path);
514     return ret;
515 }
516 
517 /*
518  * options_from_list - process a string of options in a wordlist.
519  */
520 int
options_from_list(w,priv)521 options_from_list(w, priv)
522     struct wordlist *w;
523     int priv;
524 {
525     char *argv[MAXARGS];
526     option_t *opt;
527     int i, n, ret = 0;
528     struct wordlist *w0;
529 
530     privileged_option = priv;
531     option_source = "secrets file";
532     option_priority = OPRIO_SECFILE;
533 
534     while (w != NULL) {
535 	opt = find_option(w->word);
536 	if (opt == NULL) {
537 	    option_error("In secrets file: unrecognized option '%s'",
538 			 w->word);
539 	    goto err;
540 	}
541 	n = n_arguments(opt);
542 	w0 = w;
543 	for (i = 0; i < n; ++i) {
544 	    w = w->next;
545 	    if (w == NULL) {
546 		option_error(
547 			"In secrets file: too few parameters for option '%s'",
548 			w0->word);
549 		goto err;
550 	    }
551 	    argv[i] = w->word;
552 	}
553 	if (!process_option(opt, w0->word, argv))
554 	    goto err;
555 	w = w->next;
556     }
557     ret = 1;
558 
559 err:
560     return ret;
561 }
562 
563 /*
564  * match_option - see if this option matches an option_t structure.
565  */
566 static int
match_option(name,opt,dowild)567 match_option(name, opt, dowild)
568     char *name;
569     option_t *opt;
570     int dowild;
571 {
572 	int (*match) __P((char *, char **, int));
573 
574 	if (dowild != (opt->type == o_wild))
575 		return 0;
576 	if (!dowild)
577 		return strcmp(name, opt->name) == 0;
578 	match = (int (*) __P((char *, char **, int))) opt->addr;
579 	return (*match)(name, NULL, 0);
580 }
581 
582 /*
583  * find_option - scan the option lists for the various protocols
584  * looking for an entry with the given name.
585  * This could be optimized by using a hash table.
586  */
587 static option_t *
find_option(name)588 find_option(name)
589     const char *name;
590 {
591 	option_t *opt;
592 	struct option_list *list;
593 	int i, dowild;
594 
595 	for (dowild = 0; dowild <= 1; ++dowild) {
596 		for (opt = general_options; opt->name != NULL; ++opt)
597 			if (match_option(name, opt, dowild))
598 				return opt;
599 		for (opt = auth_options; opt->name != NULL; ++opt)
600 			if (match_option(name, opt, dowild))
601 				return opt;
602 		for (list = extra_options; list != NULL; list = list->next)
603 			for (opt = list->options; opt->name != NULL; ++opt)
604 				if (match_option(name, opt, dowild))
605 					return opt;
606 		for (opt = the_channel->options; opt->name != NULL; ++opt)
607 			if (match_option(name, opt, dowild))
608 				return opt;
609 		for (i = 0; protocols[i] != NULL; ++i)
610 			if ((opt = protocols[i]->options) != NULL)
611 				for (; opt->name != NULL; ++opt)
612 					if (match_option(name, opt, dowild))
613 						return opt;
614 	}
615 	return NULL;
616 }
617 
618 /*
619  * process_option - process one new-style option.
620  */
621 static int
process_option(opt,cmd,argv)622 process_option(opt, cmd, argv)
623     option_t *opt;
624     char *cmd;
625     char **argv;
626 {
627     u_int32_t v;
628     int iv, a;
629     char *sv;
630     int (*parser) __P((char **));
631     int (*wildp) __P((char *, char **, int));
632     char *optopt = (opt->type == o_wild)? "": " option";
633     int prio = option_priority;
634     option_t *mainopt = opt;
635 
636     current_option = opt->name;
637     if ((opt->flags & OPT_PRIVFIX) && privileged_option)
638 	prio += OPRIO_ROOT;
639     while (mainopt->flags & OPT_PRIOSUB)
640 	--mainopt;
641     if (mainopt->flags & OPT_PRIO) {
642 	if (prio < mainopt->priority) {
643 	    /* new value doesn't override old */
644 	    if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
645 		option_error("%s%s set in %s cannot be overridden\n",
646 			     opt->name, optopt, mainopt->source);
647 		return 0;
648 	    }
649 	    return 1;
650 	}
651 	if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
652 	    warn("%s%s from %s overrides command line",
653 		 opt->name, optopt, option_source);
654     }
655 
656     if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
657 	option_error("%s%s cannot be changed after initialization",
658 		     opt->name, optopt);
659 	return 0;
660     }
661     if ((opt->flags & OPT_PRIV) && !privileged_option) {
662 	option_error("using the %s%s requires root privilege",
663 		     opt->name, optopt);
664 	return 0;
665     }
666     if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
667 	option_error("%s%s is disabled", opt->name, optopt);
668 	return 0;
669     }
670     if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
671 	option_error("the %s%s may not be changed in %s",
672 		     opt->name, optopt, option_source);
673 	return 0;
674     }
675 
676     switch (opt->type) {
677     case o_bool:
678 	v = opt->flags & OPT_VALUE;
679 	*(bool *)(opt->addr) = v;
680 	if (opt->addr2 && (opt->flags & OPT_A2COPY))
681 	    *(bool *)(opt->addr2) = v;
682 	else if (opt->addr2 && (opt->flags & OPT_A2CLR))
683 	    *(bool *)(opt->addr2) = 0;
684 	else if (opt->addr2 && (opt->flags & OPT_A2CLRB))
685 	    *(u_char *)(opt->addr2) &= ~v;
686 	else if (opt->addr2 && (opt->flags & OPT_A2OR))
687 	    *(u_char *)(opt->addr2) |= v;
688 	break;
689 
690     case o_int:
691 	iv = 0;
692 	if ((opt->flags & OPT_NOARG) == 0) {
693 	    if (!int_option(*argv, &iv))
694 		return 0;
695 	    if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
696 		 || ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
697 		&& !((opt->flags & OPT_ZEROOK && iv == 0))) {
698 		char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
699 		switch (opt->flags & OPT_LIMITS) {
700 		case OPT_LLIMIT:
701 		    option_error("%s value must be%s >= %d",
702 				 opt->name, zok, opt->lower_limit);
703 		    break;
704 		case OPT_ULIMIT:
705 		    option_error("%s value must be%s <= %d",
706 				 opt->name, zok, opt->upper_limit);
707 		    break;
708 		case OPT_LIMITS:
709 		    option_error("%s value must be%s between %d and %d",
710 				opt->name, zok, opt->lower_limit, opt->upper_limit);
711 		    break;
712 		}
713 		return 0;
714 	    }
715 	}
716 	a = opt->flags & OPT_VALUE;
717 	if (a >= 128)
718 	    a -= 256;		/* sign extend */
719 	iv += a;
720 	if (opt->flags & OPT_INC)
721 	    iv += *(int *)(opt->addr);
722 	if ((opt->flags & OPT_NOINCR) && !privileged_option) {
723 	    int oldv = *(int *)(opt->addr);
724 	    if ((opt->flags & OPT_ZEROINF) ?
725 		(oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
726 		option_error("%s value cannot be increased", opt->name);
727 		return 0;
728 	    }
729 	}
730 	*(int *)(opt->addr) = iv;
731 	if (opt->addr2 && (opt->flags & OPT_A2COPY))
732 	    *(int *)(opt->addr2) = iv;
733 	break;
734 
735     case o_uint32:
736 	if (opt->flags & OPT_NOARG) {
737 	    v = opt->flags & OPT_VALUE;
738 	    if (v & 0x80)
739 		    v |= 0xffffff00U;
740 	} else if (!number_option(*argv, &v, 16))
741 	    return 0;
742 	if (opt->flags & OPT_OR)
743 	    v |= *(u_int32_t *)(opt->addr);
744 	*(u_int32_t *)(opt->addr) = v;
745 	if (opt->addr2 && (opt->flags & OPT_A2COPY))
746 	    *(u_int32_t *)(opt->addr2) = v;
747 	break;
748 
749     case o_string:
750 	if (opt->flags & OPT_STATIC) {
751 	    strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
752 	} else {
753 	    sv = strdup(*argv);
754 	    if (sv == NULL)
755 		novm("option argument");
756 	    *(char **)(opt->addr) = sv;
757 	}
758 	break;
759 
760     case o_special_noarg:
761     case o_special:
762 	parser = (int (*) __P((char **))) opt->addr;
763 	if (!(*parser)(argv))
764 	    return 0;
765 	if (opt->flags & OPT_A2LIST) {
766 	    struct option_value *ovp, **pp;
767 
768 	    ovp = malloc(sizeof(*ovp) + strlen(*argv));
769 	    if (ovp != 0) {
770 		strcpy(ovp->value, *argv);
771 		ovp->source = option_source;
772 		ovp->next = NULL;
773 		pp = (struct option_value **) &opt->addr2;
774 		while (*pp != 0)
775 		    pp = &(*pp)->next;
776 		*pp = ovp;
777 	    }
778 	}
779 	break;
780 
781     case o_wild:
782 	wildp = (int (*) __P((char *, char **, int))) opt->addr;
783 	if (!(*wildp)(cmd, argv, 1))
784 	    return 0;
785 	break;
786     }
787 
788     if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
789 		|OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST|OPT_A2OR)) == 0)
790 	*(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
791 
792     mainopt->source = option_source;
793     mainopt->priority = prio;
794     mainopt->winner = opt - mainopt;
795 
796     return 1;
797 }
798 
799 /*
800  * override_value - if the option priorities would permit us to
801  * override the value of option, return 1 and update the priority
802  * and source of the option value.  Otherwise returns 0.
803  */
804 int
override_value(option,priority,source)805 override_value(option, priority, source)
806     const char *option;
807     int priority;
808     const char *source;
809 {
810 	option_t *opt;
811 
812 	opt = find_option(option);
813 	if (opt == NULL)
814 		return 0;
815 	while (opt->flags & OPT_PRIOSUB)
816 		--opt;
817 	if ((opt->flags & OPT_PRIO) && priority < opt->priority)
818 		return 0;
819 	opt->priority = priority;
820 	opt->source = source;
821 	opt->winner = -1;
822 	return 1;
823 }
824 
825 /*
826  * n_arguments - tell how many arguments an option takes
827  */
828 static int
n_arguments(opt)829 n_arguments(opt)
830     option_t *opt;
831 {
832 	return (opt->type == o_bool || opt->type == o_special_noarg
833 		|| (opt->flags & OPT_NOARG))? 0: 1;
834 }
835 
836 /*
837  * add_options - add a list of options to the set we grok.
838  */
839 void
add_options(opt)840 add_options(opt)
841     option_t *opt;
842 {
843     struct option_list *list;
844 
845     list = malloc(sizeof(*list));
846     if (list == 0)
847 	novm("option list entry");
848     list->options = opt;
849     list->next = extra_options;
850     extra_options = list;
851 }
852 
853 /*
854  * check_options - check that options are valid and consistent.
855  */
856 void
check_options()857 check_options()
858 {
859 	if (logfile_fd >= 0 && logfile_fd != log_to_fd)
860 		close(logfile_fd);
861 }
862 
863 /*
864  * print_option - print out an option and its value
865  */
866 static void
print_option(opt,mainopt,printer,arg)867 print_option(opt, mainopt, printer, arg)
868     option_t *opt, *mainopt;
869     void (*printer) __P((void *, char *, ...));
870     void *arg;
871 {
872 	int i, v;
873 	char *p;
874 
875 	if (opt->flags & OPT_NOPRINT)
876 		return;
877 	switch (opt->type) {
878 	case o_bool:
879 		v = opt->flags & OPT_VALUE;
880 		if (*(bool *)opt->addr != v)
881 			/* this can happen legitimately, e.g. lock
882 			   option turned off for default device */
883 			break;
884 		printer(arg, "%s", opt->name);
885 		break;
886 	case o_int:
887 		v = opt->flags & OPT_VALUE;
888 		if (v >= 128)
889 			v -= 256;
890 		i = *(int *)opt->addr;
891 		if (opt->flags & OPT_NOARG) {
892 			printer(arg, "%s", opt->name);
893 			if (i != v) {
894 				if (opt->flags & OPT_INC) {
895 					for (; i > v; i -= v)
896 						printer(arg, " %s", opt->name);
897 				} else
898 					printer(arg, " # oops: %d not %d\n",
899 						i, v);
900 			}
901 		} else {
902 			printer(arg, "%s %d", opt->name, i);
903 		}
904 		break;
905 	case o_uint32:
906 		printer(arg, "%s", opt->name);
907 		if ((opt->flags & OPT_NOARG) == 0)
908 			printer(arg, " %x", *(u_int32_t *)opt->addr);
909 		break;
910 
911 	case o_string:
912 		if (opt->flags & OPT_HIDE) {
913 			p = "??????";
914 		} else {
915 			p = (char *) opt->addr;
916 			if ((opt->flags & OPT_STATIC) == 0)
917 				p = *(char **)p;
918 		}
919 		printer(arg, "%s %q", opt->name, p);
920 		break;
921 
922 	case o_special:
923 	case o_special_noarg:
924 	case o_wild:
925 		if (opt->type != o_wild) {
926 			printer(arg, "%s", opt->name);
927 			if (n_arguments(opt) == 0)
928 				break;
929 			printer(arg, " ");
930 		}
931 		if (opt->flags & OPT_A2PRINTER) {
932 			void (*oprt) __P((option_t *,
933 					  void ((*)__P((void *, char *, ...))),
934 					  void *));
935 			oprt = (void (*) __P((option_t *,
936 					 void ((*)__P((void *, char *, ...))),
937 					 void *)))opt->addr2;
938 			(*oprt)(opt, printer, arg);
939 		} else if (opt->flags & OPT_A2STRVAL) {
940 			p = (char *) opt->addr2;
941 			if ((opt->flags & OPT_STATIC) == 0)
942 				p = *(char **)p;
943 			printer("%q", p);
944 		} else if (opt->flags & OPT_A2LIST) {
945 			struct option_value *ovp;
946 
947 			ovp = (struct option_value *) opt->addr2;
948 			for (;;) {
949 				printer(arg, "%q", ovp->value);
950 				if ((ovp = ovp->next) == NULL)
951 					break;
952 				printer(arg, "\t\t# (from %s)\n%s ",
953 					ovp->source, opt->name);
954 			}
955 		} else {
956 			printer(arg, "xxx # [don't know how to print value]");
957 		}
958 		break;
959 
960 	default:
961 		printer(arg, "# %s value (type %d\?\?)", opt->name, opt->type);
962 		break;
963 	}
964 	printer(arg, "\t\t# (from %s)\n", mainopt->source);
965 }
966 
967 /*
968  * print_option_list - print out options in effect from an
969  * array of options.
970  */
971 static void
print_option_list(opt,printer,arg)972 print_option_list(opt, printer, arg)
973     option_t *opt;
974     void (*printer) __P((void *, char *, ...));
975     void *arg;
976 {
977 	while (opt->name != NULL) {
978 		if (opt->priority != OPRIO_DEFAULT
979 		    && opt->winner != (short int) -1)
980 			print_option(opt + opt->winner, opt, printer, arg);
981 		do {
982 			++opt;
983 		} while (opt->flags & OPT_PRIOSUB);
984 	}
985 }
986 
987 /*
988  * print_options - print out what options are in effect.
989  */
990 void
991 print_options(printer, arg)
992     void (*printer) __P((void *, char *, ...));
993     void *arg;
994 {
995 	struct option_list *list;
996 	int i;
997 
998 	printer(arg, "pppd options in effect:\n");
999 	print_option_list(general_options, printer, arg);
1000 	print_option_list(auth_options, printer, arg);
1001 	for (list = extra_options; list != NULL; list = list->next)
1002 		print_option_list(list->options, printer, arg);
1003 	print_option_list(the_channel->options, printer, arg);
1004 	for (i = 0; protocols[i] != NULL; ++i)
1005 		print_option_list(protocols[i]->options, printer, arg);
1006 }
1007 
1008 /*
1009  * usage - print out a message telling how to use the program.
1010  */
1011 static void
usage()1012 usage()
1013 {
1014     if (phase == PHASE_INITIALIZE)
1015 	fprintf(stderr, usage_string, VERSION, progname);
1016 }
1017 
1018 /*
1019  * showhelp - print out usage message and exit.
1020  */
1021 static int
showhelp(argv)1022 showhelp(argv)
1023     char **argv;
1024 {
1025     if (phase == PHASE_INITIALIZE) {
1026 	usage();
1027 	exit(0);
1028     }
1029     return 0;
1030 }
1031 
1032 /*
1033  * showversion - print out the version number and exit.
1034  */
1035 static int
showversion(argv)1036 showversion(argv)
1037     char **argv;
1038 {
1039     if (phase == PHASE_INITIALIZE) {
1040 	fprintf(stderr, "pppd version %s\n", VERSION);
1041 	exit(0);
1042     }
1043     return 0;
1044 }
1045 
1046 /*
1047  * option_error - print a message about an error in an option.
1048  * The message is logged, and also sent to
1049  * stderr if phase == PHASE_INITIALIZE.
1050  */
1051 void
option_error(char * fmt,...)1052 option_error __V((char *fmt, ...))
1053 {
1054     va_list args;
1055     char buf[1024];
1056 
1057 #if defined(__STDC__)
1058     va_start(args, fmt);
1059 #else
1060     char *fmt;
1061     va_start(args);
1062     fmt = va_arg(args, char *);
1063 #endif
1064     vslprintf(buf, sizeof(buf), fmt, args);
1065     va_end(args);
1066     if (phase == PHASE_INITIALIZE)
1067 	fprintf(stderr, "%s: %s\n", progname, buf);
1068 #ifndef ANDROID_CHANGES
1069     syslog(LOG_ERR, "%s", buf);
1070 #else
1071     error("%s", buf);
1072 #endif
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
getword(f,word,newlinep,filename)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
number_option(str,valp,base)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
int_option(str,valp)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
readfile(argv)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
callfile(argv)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
setpassfilter(argv)1451 setpassfilter(argv)
1452     char **argv;
1453 {
1454     pcap_t *pc;
1455     int ret = 0;
1456 
1457     pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 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 = 1;
1462     }
1463     pcap_close(pc);
1464 
1465     return ret;
1466 }
1467 
1468 /*
1469  * setactivefilter - Set the active filter for packets
1470  */
1471 static int
setactivefilter(argv)1472 setactivefilter(argv)
1473     char **argv;
1474 {
1475     pcap_t *pc;
1476     int ret = 0;
1477 
1478     pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 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 = 1;
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
setdomain(argv)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
setlogfile(argv)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
setmodir(argv)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
loadplugin(argv)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 */
1611