2 * options.c - handles option processing for PPP.
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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
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
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
27 * tech-transfer@andrew.cmu.edu
29 * 4. Redistributions of any form whatsoever must retain the following
31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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.
43 #define RCSID "$Id: options.c,v 1.102 2008/06/15 06:53:06 paulus Exp $"
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.
67 #ifdef DLT_PPP_WITHDIRECTION
68 #define DLT_PPP_PPPD DLT_PPP_WITHDIRECTION
70 #define DLT_PPP_PPPD DLT_PPP
73 #endif /* PPP_FILTER */
76 #include "pathnames.h"
78 #if defined(ultrix) || defined(NeXT)
79 char *strdup __P((char *));
82 static const char rcsid[] = RCSID;
85 struct option_value *next;
91 * Option variables and default values.
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 */
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 */
130 extern option_t auth_options[];
131 extern struct stat devstat;
134 struct bpf_program pass_filter;/* Filter program for packets to pass */
135 struct bpf_program active_filter; /* Filter program for link-active pkts */
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 */
144 static int logfile_fd = -1; /* fd opened for log file */
145 static char logfile_name[MAXPATHLEN]; /* name of log file */
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 **));
158 static int loadplugin __P((char **));
162 static int setpassfilter __P((char **));
163 static int setactivefilter __P((char **));
167 static int setmodir __P((char **));
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));
176 * Structure to store extra lists of options.
180 struct option_list *next;
183 static struct option_list *extra_options = NULL;
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 },
195 { "kdebug", o_int, &kdebugflag,
196 "Set kernel driver debug level", OPT_PRIO },
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 },
206 { "holdoff", o_int, &holdoff,
207 "Set time in seconds before retrying connection",
208 OPT_PRIO, &holdoff_specified },
210 { "idle", o_int, &idle_time_limit,
211 "Set time in seconds before disconnecting idle link", OPT_PRIO },
213 { "maxconnect", o_int, &maxconnect,
214 "Set connection time limit",
215 OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
217 { "domain", o_special, (void *)setdomain,
218 "Add given domain name to hostname",
219 OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
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 },
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 },
231 { "demand", o_bool, &demand,
232 "Dial on demand", OPT_INITONLY | 1, &persist },
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 },
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) },
254 { "linkname", o_string, linkname,
255 "Set logical name for link",
256 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
258 { "maxfail", o_int, &maxfail,
259 "Maximum number of unsuccessful connection attempts to allow",
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 },
267 { "connect-delay", o_int, &connect_delay,
268 "Maximum time (in ms) to wait after connect script finishes",
271 { "unit", o_int, &req_unit,
272 "PPP interface unit number to use if possible",
273 OPT_PRIO | OPT_LLIMIT, 0, 0 },
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 },
280 { "child-timeout", o_int, &child_wait,
281 "Number of seconds to wait for child processes at exit",
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 },
294 { "bundle", o_string, &bundle_name,
295 "Bundle name for multilink", OPT_PRIO },
296 #endif /* HAVE_MULTILINK */
299 { "plugin", o_special, (void *)loadplugin,
300 "Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
304 { "pass-filter", o_special, setpassfilter,
305 "set filter for packets to pass", OPT_PRIO },
307 { "active-filter", o_special, setactivefilter,
308 "set filter for active pkts", OPT_PRIO },
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 },
327 #ifndef IMPLEMENTATION
328 #define IMPLEMENTATION ""
331 static char *usage_string = "\
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\
350 * parse_args - parse a string of arguments from the command line.
353 parse_args(argc, argv)
361 privileged_option = privileged;
362 option_source = "command line";
363 option_priority = OPRIO_CMDLINE;
367 opt = find_option(arg);
369 option_error("unrecognized option '%s'", arg);
373 n = n_arguments(opt);
375 option_error("too few parameters for option %s", arg);
378 if (!process_option(opt, arg, argv))
387 * options_from_file - Read a string of options from a file,
388 * and interpret them.
391 options_from_file(filename, must_exist, check_prot, priv)
398 int i, newline, ret, err;
404 char args[MAXARGS][MAXWORDLEN];
405 char cmd[MAXWORDLEN];
408 if (check_prot && seteuid(getuid()) == -1) {
409 option_error("unable to drop privileges to open %s: %m", filename);
412 f = fopen(filename, "r");
414 if (check_prot && seteuid(euid) == -1)
415 fatal("unable to regain privileges");
419 if (err != ENOENT && err != ENOTDIR)
420 warn("Warning: can't open options file %s: %m", filename);
423 option_error("Can't open options file %s: %m", filename);
427 oldpriv = privileged_option;
428 privileged_option = priv;
429 oldsource = option_source;
430 option_source = strdup(filename);
431 if (option_source == NULL)
432 option_source = "file";
434 while (getword(f, cmd, &newline, filename)) {
435 opt = find_option(cmd);
437 option_error("In file %s: unrecognized option '%s'",
441 n = n_arguments(opt);
442 for (i = 0; i < n; ++i) {
443 if (!getword(f, args[i], &newline, filename)) {
445 "In file %s: too few parameters for option '%s'",
451 if (!process_option(opt, cmd, argv))
458 privileged_option = oldpriv;
459 option_source = oldsource;
464 * options_from_user - See if the use has a ~/.ppprc file,
465 * and if so, interpret options from it.
470 char *user, *path, *file;
475 pw = getpwuid(getuid());
476 if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
478 file = _PATH_USEROPT;
479 pl = strlen(user) + strlen(file) + 2;
482 novm("init file name");
483 slprintf(path, pl, "%s/%s", user, file);
484 option_priority = OPRIO_CFGFILE;
485 ret = options_from_file(path, 0, 1, privileged);
491 * options_for_tty - See if an options file exists for the serial
492 * device, and if so, interpret options from it.
493 * We only allow the per-tty options file to override anything from
494 * the command line if it is something that the user can't override
495 * once it has been set by root; this is done by giving configuration
496 * files a lower priority than the command line.
501 char *dev, *path, *p;
506 if ((p = strstr(dev, "/dev/")) != NULL)
508 if (dev[0] == 0 || strcmp(dev, "tty") == 0)
509 return 1; /* don't look for /etc/ppp/options.tty */
510 pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
513 novm("tty init file name");
514 slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
515 /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
516 for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
519 option_priority = OPRIO_CFGFILE;
520 ret = options_from_file(path, 0, 0, 1);
526 * options_from_list - process a string of options in a wordlist.
529 options_from_list(w, priv)
538 privileged_option = priv;
539 option_source = "secrets file";
540 option_priority = OPRIO_SECFILE;
543 opt = find_option(w->word);
545 option_error("In secrets file: unrecognized option '%s'",
549 n = n_arguments(opt);
551 for (i = 0; i < n; ++i) {
555 "In secrets file: too few parameters for option '%s'",
561 if (!process_option(opt, w0->word, argv))
572 * match_option - see if this option matches an option_t structure.
575 match_option(name, opt, dowild)
580 int (*match) __P((char *, char **, int));
582 if (dowild != (opt->type == o_wild))
585 return strcmp(name, opt->name) == 0;
586 match = (int (*) __P((char *, char **, int))) opt->addr;
587 return (*match)(name, NULL, 0);
591 * find_option - scan the option lists for the various protocols
592 * looking for an entry with the given name.
593 * This could be optimized by using a hash table.
600 struct option_list *list;
603 for (dowild = 0; dowild <= 1; ++dowild) {
604 for (opt = general_options; opt->name != NULL; ++opt)
605 if (match_option(name, opt, dowild))
607 for (opt = auth_options; opt->name != NULL; ++opt)
608 if (match_option(name, opt, dowild))
610 for (list = extra_options; list != NULL; list = list->next)
611 for (opt = list->options; opt->name != NULL; ++opt)
612 if (match_option(name, opt, dowild))
614 for (opt = the_channel->options; opt->name != NULL; ++opt)
615 if (match_option(name, opt, dowild))
617 for (i = 0; protocols[i] != NULL; ++i)
618 if ((opt = protocols[i]->options) != NULL)
619 for (; opt->name != NULL; ++opt)
620 if (match_option(name, opt, dowild))
627 * process_option - process one new-style option.
630 process_option(opt, cmd, argv)
638 int (*parser) __P((char **));
639 int (*wildp) __P((char *, char **, int));
640 char *optopt = (opt->type == o_wild)? "": " option";
641 int prio = option_priority;
642 option_t *mainopt = opt;
644 current_option = opt->name;
645 if ((opt->flags & OPT_PRIVFIX) && privileged_option)
647 while (mainopt->flags & OPT_PRIOSUB)
649 if (mainopt->flags & OPT_PRIO) {
650 if (prio < mainopt->priority) {
651 /* new value doesn't override old */
652 if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
653 option_error("%s%s set in %s cannot be overridden\n",
654 opt->name, optopt, mainopt->source);
659 if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
660 warn("%s%s from %s overrides command line",
661 opt->name, optopt, option_source);
664 if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
665 option_error("%s%s cannot be changed after initialization",
669 if ((opt->flags & OPT_PRIV) && !privileged_option) {
670 option_error("using the %s%s requires root privilege",
674 if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
675 option_error("%s%s is disabled", opt->name, optopt);
678 if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
679 option_error("the %s%s may not be changed in %s",
680 opt->name, optopt, option_source);
686 v = opt->flags & OPT_VALUE;
687 *(bool *)(opt->addr) = v;
688 if (opt->addr2 && (opt->flags & OPT_A2COPY))
689 *(bool *)(opt->addr2) = v;
690 else if (opt->addr2 && (opt->flags & OPT_A2CLR))
691 *(bool *)(opt->addr2) = 0;
692 else if (opt->addr2 && (opt->flags & OPT_A2CLRB))
693 *(u_char *)(opt->addr2) &= ~v;
694 else if (opt->addr2 && (opt->flags & OPT_A2OR))
695 *(u_char *)(opt->addr2) |= v;
700 if ((opt->flags & OPT_NOARG) == 0) {
701 if (!int_option(*argv, &iv))
703 if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
704 || ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
705 && !((opt->flags & OPT_ZEROOK && iv == 0))) {
706 char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
707 switch (opt->flags & OPT_LIMITS) {
709 option_error("%s value must be%s >= %d",
710 opt->name, zok, opt->lower_limit);
713 option_error("%s value must be%s <= %d",
714 opt->name, zok, opt->upper_limit);
717 option_error("%s value must be%s between %d and %d",
718 opt->name, zok, opt->lower_limit, opt->upper_limit);
724 a = opt->flags & OPT_VALUE;
726 a -= 256; /* sign extend */
728 if (opt->flags & OPT_INC)
729 iv += *(int *)(opt->addr);
730 if ((opt->flags & OPT_NOINCR) && !privileged_option) {
731 int oldv = *(int *)(opt->addr);
732 if ((opt->flags & OPT_ZEROINF) ?
733 (oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
734 option_error("%s value cannot be increased", opt->name);
738 *(int *)(opt->addr) = iv;
739 if (opt->addr2 && (opt->flags & OPT_A2COPY))
740 *(int *)(opt->addr2) = iv;
744 if (opt->flags & OPT_NOARG) {
745 v = opt->flags & OPT_VALUE;
748 } else if (!number_option(*argv, &v, 16))
750 if (opt->flags & OPT_OR)
751 v |= *(u_int32_t *)(opt->addr);
752 *(u_int32_t *)(opt->addr) = v;
753 if (opt->addr2 && (opt->flags & OPT_A2COPY))
754 *(u_int32_t *)(opt->addr2) = v;
758 if (opt->flags & OPT_STATIC) {
759 strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
763 novm("option argument");
764 *(char **)(opt->addr) = sv;
768 case o_special_noarg:
770 parser = (int (*) __P((char **))) opt->addr;
771 if (!(*parser)(argv))
773 if (opt->flags & OPT_A2LIST) {
774 struct option_value *ovp, *pp;
776 ovp = malloc(sizeof(*ovp) + strlen(*argv));
778 strcpy(ovp->value, *argv);
779 ovp->source = option_source;
781 if (opt->addr2 == NULL) {
784 for (pp = opt->addr2; pp->next != NULL; pp = pp->next)
793 wildp = (int (*) __P((char *, char **, int))) opt->addr;
794 if (!(*wildp)(cmd, argv, 1))
800 * If addr2 wasn't used by any flag (OPT_A2COPY, etc.) but is set,
801 * treat it as a bool and set/clear it based on the OPT_A2CLR bit.
803 if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
804 |OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST|OPT_A2OR)) == 0)
805 *(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
807 mainopt->source = option_source;
808 mainopt->priority = prio;
809 mainopt->winner = opt - mainopt;
815 * override_value - if the option priorities would permit us to
816 * override the value of option, return 1 and update the priority
817 * and source of the option value. Otherwise returns 0.
820 override_value(option, priority, source)
827 opt = find_option(option);
830 while (opt->flags & OPT_PRIOSUB)
832 if ((opt->flags & OPT_PRIO) && priority < opt->priority)
834 opt->priority = priority;
835 opt->source = source;
841 * n_arguments - tell how many arguments an option takes
847 return (opt->type == o_bool || opt->type == o_special_noarg
848 || (opt->flags & OPT_NOARG))? 0: 1;
852 * add_options - add a list of options to the set we grok.
858 struct option_list *list;
860 list = malloc(sizeof(*list));
862 novm("option list entry");
864 list->next = extra_options;
865 extra_options = list;
869 * check_options - check that options are valid and consistent.
874 if (logfile_fd >= 0 && logfile_fd != log_to_fd)
879 * print_option - print out an option and its value
882 print_option(opt, mainopt, printer, arg)
883 option_t *opt, *mainopt;
884 void (*printer) __P((void *, char *, ...));
890 if (opt->flags & OPT_NOPRINT)
894 v = opt->flags & OPT_VALUE;
895 if (*(bool *)opt->addr != v)
896 /* this can happen legitimately, e.g. lock
897 option turned off for default device */
899 printer(arg, "%s", opt->name);
902 v = opt->flags & OPT_VALUE;
905 i = *(int *)opt->addr;
906 if (opt->flags & OPT_NOARG) {
907 printer(arg, "%s", opt->name);
909 if (opt->flags & OPT_INC) {
910 for (; i > v; i -= v)
911 printer(arg, " %s", opt->name);
913 printer(arg, " # oops: %d not %d\n",
917 printer(arg, "%s %d", opt->name, i);
921 printer(arg, "%s", opt->name);
922 if ((opt->flags & OPT_NOARG) == 0)
923 printer(arg, " %x", *(u_int32_t *)opt->addr);
927 if (opt->flags & OPT_HIDE) {
930 p = (char *) opt->addr;
931 if ((opt->flags & OPT_STATIC) == 0)
934 printer(arg, "%s %q", opt->name, p);
938 case o_special_noarg:
940 if (opt->type != o_wild) {
941 printer(arg, "%s", opt->name);
942 if (n_arguments(opt) == 0)
946 if (opt->flags & OPT_A2PRINTER) {
947 void (*oprt) __P((option_t *,
948 void ((*)__P((void *, char *, ...))),
950 oprt = (void (*) __P((option_t *,
951 void ((*)__P((void *, char *, ...))),
953 (*oprt)(opt, printer, arg);
954 } else if (opt->flags & OPT_A2STRVAL) {
955 p = (char *) opt->addr2;
956 if ((opt->flags & OPT_STATIC) == 0)
959 } else if (opt->flags & OPT_A2LIST) {
960 struct option_value *ovp;
962 ovp = (struct option_value *) opt->addr2;
964 printer(arg, "%q", ovp->value);
965 if ((ovp = ovp->next) == NULL)
967 printer(arg, "\t\t# (from %s)\n%s ",
968 ovp->source, opt->name);
971 printer(arg, "xxx # [don't know how to print value]");
976 printer(arg, "# %s value (type %d\?\?)", opt->name, opt->type);
979 printer(arg, "\t\t# (from %s)\n", mainopt->source);
983 * print_option_list - print out options in effect from an
987 print_option_list(opt, printer, arg)
989 void (*printer) __P((void *, char *, ...));
992 while (opt->name != NULL) {
993 if (opt->priority != OPRIO_DEFAULT
994 && opt->winner != (short int) -1)
995 print_option(opt + opt->winner, opt, printer, arg);
998 } while (opt->flags & OPT_PRIOSUB);
1003 * print_options - print out what options are in effect.
1006 print_options(printer, arg)
1007 void (*printer) __P((void *, char *, ...));
1010 struct option_list *list;
1013 printer(arg, "pppd options in effect:\n");
1014 print_option_list(general_options, printer, arg);
1015 print_option_list(auth_options, printer, arg);
1016 for (list = extra_options; list != NULL; list = list->next)
1017 print_option_list(list->options, printer, arg);
1018 print_option_list(the_channel->options, printer, arg);
1019 for (i = 0; protocols[i] != NULL; ++i)
1020 print_option_list(protocols[i]->options, printer, arg);
1024 * usage - print out a message telling how to use the program.
1029 if (phase == PHASE_INITIALIZE)
1030 fprintf(stderr, usage_string, VERSION, progname);
1034 * showhelp - print out usage message and exit.
1040 if (phase == PHASE_INITIALIZE) {
1048 * showversion - print out the version number and exit.
1054 if (phase == PHASE_INITIALIZE) {
1055 fprintf(stderr, "pppd version %s\n", VERSION);
1062 * option_error - print a message about an error in an option.
1063 * The message is logged, and also sent to
1064 * stderr if phase == PHASE_INITIALIZE.
1067 option_error __V((char *fmt, ...))
1072 #if defined(__STDC__)
1073 va_start(args, fmt);
1077 fmt = va_arg(args, char *);
1079 vslprintf(buf, sizeof(buf), fmt, args);
1081 if (phase == PHASE_INITIALIZE)
1082 fprintf(stderr, "%s: %s\n", progname, buf);
1083 syslog(LOG_ERR, "%s", buf);
1088 * readable - check if a file is readable by the real user.
1101 if (fstat(fd, &sbuf) != 0)
1103 if (sbuf.st_uid == uid)
1104 return sbuf.st_mode & S_IRUSR;
1105 if (sbuf.st_gid == getgid())
1106 return sbuf.st_mode & S_IRGRP;
1107 for (i = 0; i < ngroups; ++i)
1108 if (sbuf.st_gid == groups[i])
1109 return sbuf.st_mode & S_IRGRP;
1110 return sbuf.st_mode & S_IROTH;
1115 * Read a word from a file.
1116 * Words are delimited by white-space or by quotes (" or ').
1117 * Quotes, white-space and \ may be escaped with \.
1118 * \<newline> is ignored.
1121 getword(f, word, newlinep, filename)
1128 int quoted, comment;
1129 int value, digit, got, n;
1131 #define isoctal(c) ((c) >= '0' && (c) < '8')
1139 * First skip white-space and comments.
1147 * A newline means the end of a comment; backslash-newline
1148 * is ignored. Note that we cannot have escape && comment.
1160 * Ignore characters other than newline in a comment.
1166 * If this character is escaped, we have a word start.
1172 * If this is the escape character, look at the next character.
1180 * If this is the start of a comment, ignore the rest of the line.
1188 * A non-whitespace character is the start of a word.
1195 * Save the delimiter for quoted strings.
1197 if (!escape && (c == '"' || c == '\'')) {
1204 * Process characters until the end of the word.
1209 * This character is escaped: backslash-newline is ignored,
1210 * various other characters indicate particular values
1211 * as for C backslash-escapes.
1246 * \ddd octal sequence
1249 for (n = 0; n < 3 && isoctal(c); ++n) {
1250 value = (value << 3) + (c & 07);
1259 * \x<hex_string> sequence
1263 for (n = 0; n < 2 && isxdigit(c); ++n) {
1264 digit = toupper(c) - '0';
1266 digit += '0' + 10 - 'A';
1267 value = (value << 4) + digit;
1275 * Otherwise the character stands for itself.
1282 * Store the resulting character for the escape sequence.
1284 if (len < MAXWORDLEN-1)
1295 * Not escaped: see if we've reached the end of the word.
1301 if (isspace(c) || c == '#') {
1308 * Backslash starts an escape sequence.
1317 * An ordinary character: store it in the word and get another.
1319 if (len < MAXWORDLEN-1)
1327 * End of the word: check for errors.
1333 option_error("Error reading %s: %m", filename);
1337 * If len is zero, then we didn't find a word before the
1345 * Warn if the word was too long, and append a terminating null.
1347 if (len >= MAXWORDLEN) {
1348 option_error("warning: word in file %s too long (%.20s...)",
1350 len = MAXWORDLEN - 1;
1361 * number_option - parse an unsigned numeric parameter for an option.
1364 number_option(str, valp, base)
1371 *valp = strtoul(str, &ptr, base);
1373 option_error("invalid numeric parameter '%s' for %s option",
1374 str, current_option);
1382 * int_option - like number_option, but valp is int *,
1383 * the base is assumed to be 0, and *valp is not changed
1384 * if there is an error.
1387 int_option(str, valp)
1393 if (!number_option(str, &v, 0))
1401 * The following procedures parse options.
1405 * readfile - take commands from a file.
1411 return options_from_file(*argv, 1, 1, privileged_option);
1415 * callfile - take commands from /etc/ppp/peers/<name>.
1416 * Name may not contain /../, start with / or ../, or end in /..
1422 char *fname, *arg, *p;
1427 if (arg[0] == '/' || arg[0] == 0)
1430 for (p = arg; *p != 0; ) {
1431 if (p[0] == '.' && p[1] == '.' && (p[2] == '/' || p[2] == 0)) {
1435 while (*p != '/' && *p != 0)
1442 option_error("call option value may not contain .. or start with /");
1446 l = strlen(arg) + strlen(_PATH_PEERFILES) + 1;
1447 if ((fname = (char *) malloc(l)) == NULL)
1448 novm("call file name");
1449 slprintf(fname, l, "%s%s", _PATH_PEERFILES, arg);
1451 ok = options_from_file(fname, 1, 1, 1);
1459 * setpassfilter - Set the pass filter for packets
1468 pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1469 if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
1470 option_error("error in pass-filter expression: %s\n",
1480 * setactivefilter - Set the active filter for packets
1483 setactivefilter(argv)
1489 pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1490 if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
1491 option_error("error in active-filter expression: %s\n",
1502 * setdomain - Set domain name to append to hostname
1508 gethostname(hostname, MAXNAMELEN);
1511 strncat(hostname, ".", MAXNAMELEN - strlen(hostname));
1512 domain = hostname + strlen(hostname);
1513 strncat(hostname, *argv, MAXNAMELEN - strlen(hostname));
1515 hostname[MAXNAMELEN-1] = 0;
1527 if (!privileged_option && seteuid(getuid()) == -1) {
1528 option_error("unable to drop permissions to open %s: %m", *argv);
1531 fd = open(*argv, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0644);
1532 if (fd < 0 && errno == EEXIST)
1533 fd = open(*argv, O_WRONLY | O_APPEND);
1535 if (!privileged_option && seteuid(euid) == -1)
1536 fatal("unable to regain privileges: %m");
1539 option_error("Can't open log file %s: %m", *argv);
1542 strlcpy(logfile_name, *argv, sizeof(logfile_name));
1543 if (logfile_fd >= 0)
1558 if(!strcmp(*argv,"in")) {
1559 maxoctets_dir = PPP_OCTETS_DIRECTION_IN;
1560 } else if (!strcmp(*argv,"out")) {
1561 maxoctets_dir = PPP_OCTETS_DIRECTION_OUT;
1562 } else if (!strcmp(*argv,"max")) {
1563 maxoctets_dir = PPP_OCTETS_DIRECTION_MAXOVERAL;
1565 maxoctets_dir = PPP_OCTETS_DIRECTION_SUM;
1579 void (*init) __P((void));
1583 if (strchr(arg, '/') == 0) {
1584 const char *base = _PATH_PLUGIN;
1585 int l = strlen(base) + strlen(arg) + 2;
1588 novm("plugin file path");
1589 strlcpy(path, base, l);
1590 strlcat(path, "/", l);
1591 strlcat(path, arg, l);
1593 handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
1597 option_error("%s", err);
1598 option_error("Couldn't load plugin %s", arg);
1601 init = (void (*)(void))dlsym(handle, "plugin_init");
1603 option_error("%s has no initialization entry point", arg);
1606 vers = (const char *) dlsym(handle, "pppd_version");
1608 warn("Warning: plugin %s has no version information", arg);
1609 } else if (strcmp(vers, VERSION) != 0) {
1610 option_error("Plugin %s is for pppd version %s, this is %s",
1611 arg, vers, VERSION);
1614 info("Plugin %s loaded.", arg);