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
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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.
64 * There have been 3 or 4 different names for this in libpcap CVS, but
65 * this seems to be what they have settled on...
66 * For older versions of libpcap, use DLT_PPP - but that means
67 * we lose the inbound and outbound qualifiers.
70 #ifdef DLT_PPP_WITHDIRECTION
71 #define DLT_PPP_PPPD DLT_PPP_WITHDIRECTION
73 #define DLT_PPP_PPPD DLT_PPP
76 #endif /* PPP_FILTER */
79 #include "pathnames.h"
81 #if defined(ultrix) || defined(NeXT)
87 struct option_value *next;
93 * Option variables and default values.
95 int debug = 0; /* Debug flag */
96 int kdebugflag = 0; /* Tell kernel to print debug messages */
97 int default_device = 1; /* Using /dev/tty or equivalent */
98 char devnam[MAXPATHLEN]; /* Device name */
99 bool nodetach = 0; /* Don't detach from controlling tty */
100 bool updetach = 0; /* Detach once link is up */
101 bool master_detach; /* Detach when we're (only) multilink master */
103 bool up_sdnotify = 0; /* Notify systemd once link is up */
105 int maxconnect = 0; /* Maximum connect time */
106 char user[MAXNAMELEN]; /* Username for PAP */
107 char passwd[MAXSECRETLEN]; /* Password for PAP */
108 bool persist = 0; /* Reopen link after it goes down */
109 char our_name[MAXNAMELEN]; /* Our name for authentication purposes */
110 bool demand = 0; /* do dial-on-demand */
111 char *ipparam = NULL; /* Extra parameter for ip up/down scripts */
112 int idle_time_limit = 0; /* Disconnect if idle for this many seconds */
113 int holdoff = 30; /* # seconds to pause before reconnecting */
114 bool holdoff_specified; /* true if a holdoff value has been given */
115 int log_to_fd = 1; /* send log messages to this fd too */
116 bool log_default = 1; /* log_to_fd is default (stdout) */
117 int maxfail = 10; /* max # of unsuccessful connection attempts */
118 char linkname[MAXPATHLEN]; /* logical name for link */
119 bool tune_kernel; /* may alter kernel settings */
120 int connect_delay = 1000; /* wait this many ms after connect script */
121 int req_unit = -1; /* requested interface unit */
122 char path_ipup[MAXPATHLEN]; /* pathname of ip-up script */
123 char path_ipdown[MAXPATHLEN];/* pathname of ip-down script */
124 char req_ifname[IFNAMSIZ]; /* requested interface name */
125 bool multilink = 0; /* Enable multilink operation */
126 char *bundle_name = NULL; /* bundle name for multilink */
127 bool dump_options; /* print out option values */
128 bool dryrun; /* print out option values and exit */
129 char *domain; /* domain name set by domain option */
130 int child_wait = 5; /* # seconds to wait for children at exit */
131 struct userenv *userenv_list; /* user environment variables */
132 int dfl_route_metric = -1; /* metric of the default route to set over the PPP link */
135 char path_ipv6up[MAXPATHLEN]; /* pathname of ipv6-up script */
136 char path_ipv6down[MAXPATHLEN]; /* pathname of ipv6-down script */
140 unsigned int maxoctets = 0; /* default - no limit */
141 int maxoctets_dir = 0; /* default - sum of traffic */
142 int maxoctets_timeout = 1; /* default 1 second */
146 extern option_t auth_options[];
147 extern struct stat devstat;
150 struct bpf_program pass_filter;/* Filter program for packets to pass */
151 struct bpf_program active_filter; /* Filter program for link-active pkts */
154 static option_t *curopt; /* pointer to option being processed */
155 char *current_option; /* the name of the option being parsed */
156 int privileged_option; /* set iff the current option came from root */
157 char *option_source; /* string saying where the option came from */
158 int option_priority = OPRIO_CFGFILE; /* priority of the current options */
159 bool devnam_fixed; /* can no longer change device name */
161 static int logfile_fd = -1; /* fd opened for log file */
162 static char logfile_name[MAXPATHLEN]; /* name of log file */
167 static int setdomain(char **);
168 static int readfile(char **);
169 static int callfile(char **);
170 static int showversion(char **);
171 static int showhelp(char **);
172 static void usage(void);
173 static int setlogfile(char **);
175 static int loadplugin(char **);
179 static int setpassfilter(char **);
180 static int setactivefilter(char **);
184 static int setmodir(char **);
187 static int user_setenv(char **);
188 static void user_setprint(option_t *, printer_func, void *);
189 static int user_unsetenv(char **);
190 static void user_unsetprint(option_t *, printer_func, void *);
192 static option_t *find_option(char *name);
193 static int process_option(option_t *, char *, char **);
194 static int n_arguments(option_t *);
195 static int number_option(char *, u_int32_t *, int);
198 * Structure to store extra lists of options.
202 struct option_list *next;
205 static struct option_list *extra_options = NULL;
210 option_t general_options[] = {
211 { "debug", o_int, &debug,
212 "Increase debugging level", OPT_INC | OPT_NOARG | 1 },
213 { "-d", o_int, &debug,
214 "Increase debugging level",
215 OPT_ALIAS | OPT_INC | OPT_NOARG | 1 },
217 { "kdebug", o_int, &kdebugflag,
218 "Set kernel driver debug level", OPT_PRIO },
220 { "nodetach", o_bool, &nodetach,
221 "Don't detach from controlling tty", OPT_PRIO | 1 },
222 { "-detach", o_bool, &nodetach,
223 "Don't detach from controlling tty", OPT_ALIAS | OPT_PRIOSUB | 1 },
225 { "up_sdnotify", o_bool, &up_sdnotify,
226 "Notify systemd once link is up (implies nodetach)",
227 OPT_PRIOSUB | OPT_A2COPY | 1, &nodetach },
229 { "updetach", o_bool, &updetach,
230 "Detach from controlling tty once link is up",
231 OPT_PRIOSUB | OPT_A2CLR | 1, &nodetach },
233 { "master_detach", o_bool, &master_detach,
234 "Detach when we're multilink master but have no link", 1 },
236 { "holdoff", o_int, &holdoff,
237 "Set time in seconds before retrying connection",
238 OPT_PRIO, &holdoff_specified },
240 { "idle", o_int, &idle_time_limit,
241 "Set time in seconds before disconnecting idle link", OPT_PRIO },
243 { "maxconnect", o_int, &maxconnect,
244 "Set connection time limit",
245 OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
247 { "domain", o_special, (void *)setdomain,
248 "Add given domain name to hostname",
249 OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
251 { "file", o_special, (void *)readfile,
252 "Take options from a file", OPT_NOPRINT },
253 { "call", o_special, (void *)callfile,
254 "Take options from a privileged file", OPT_NOPRINT },
256 { "persist", o_bool, &persist,
257 "Keep on reopening connection after close", OPT_PRIO | 1 },
258 { "nopersist", o_bool, &persist,
259 "Turn off persist option", OPT_PRIOSUB },
261 { "demand", o_bool, &demand,
262 "Dial on demand", OPT_INITONLY | 1, &persist },
264 { "--version", o_special_noarg, (void *)showversion,
265 "Show version number" },
266 { "--help", o_special_noarg, (void *)showhelp,
267 "Show brief listing of options" },
268 { "-h", o_special_noarg, (void *)showhelp,
269 "Show brief listing of options", OPT_ALIAS },
271 { "logfile", o_special, (void *)setlogfile,
272 "Append log messages to this file",
273 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, &logfile_name },
274 { "logfd", o_int, &log_to_fd,
275 "Send log messages to this file descriptor",
276 OPT_PRIOSUB | OPT_A2CLR, &log_default },
277 { "nolog", o_int, &log_to_fd,
278 "Don't send log messages to any file",
279 OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) },
280 { "nologfd", o_int, &log_to_fd,
281 "Don't send log messages to any file descriptor",
282 OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
284 { "linkname", o_string, linkname,
285 "Set logical name for link",
286 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
288 { "maxfail", o_int, &maxfail,
289 "Maximum number of unsuccessful connection attempts to allow",
292 { "ktune", o_bool, &tune_kernel,
293 "Alter kernel settings as necessary", OPT_PRIO | 1 },
294 { "noktune", o_bool, &tune_kernel,
295 "Don't alter kernel settings", OPT_PRIOSUB },
297 { "connect-delay", o_int, &connect_delay,
298 "Maximum time (in ms) to wait after connect script finishes",
301 { "unit", o_int, &req_unit,
302 "PPP interface unit number to use if possible",
303 OPT_PRIO | OPT_LLIMIT, 0, 0 },
305 { "ifname", o_string, req_ifname,
306 "Set PPP interface name",
307 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, IFNAMSIZ },
309 { "dump", o_bool, &dump_options,
310 "Print out option values after parsing all options", 1 },
311 { "dryrun", o_bool, &dryrun,
312 "Stop after parsing, printing, and checking options", 1 },
314 { "child-timeout", o_int, &child_wait,
315 "Number of seconds to wait for child processes at exit",
318 { "set", o_special, (void *)user_setenv,
319 "Set user environment variable",
320 OPT_A2PRINTER | OPT_NOPRINT, (void *)user_setprint },
321 { "unset", o_special, (void *)user_unsetenv,
322 "Unset user environment variable",
323 OPT_A2PRINTER | OPT_NOPRINT, (void *)user_unsetprint },
325 { "defaultroute-metric", o_int, &dfl_route_metric,
326 "Metric to use for the default route (Linux only; -1 for default behavior)",
327 OPT_PRIV|OPT_LLIMIT|OPT_INITONLY, NULL, 0, -1 },
329 { "ip-up-script", o_string, path_ipup,
330 "Set pathname of ip-up script",
331 OPT_PRIV|OPT_STATIC, NULL, MAXPATHLEN },
332 { "ip-down-script", o_string, path_ipdown,
333 "Set pathname of ip-down script",
334 OPT_PRIV|OPT_STATIC, NULL, MAXPATHLEN },
337 { "ipv6-up-script", o_string, path_ipv6up,
338 "Set pathname of ipv6-up script",
339 OPT_PRIV|OPT_STATIC, NULL, MAXPATHLEN },
340 { "ipv6-down-script", o_string, path_ipv6down,
341 "Set pathname of ipv6-down script",
342 OPT_PRIV|OPT_STATIC, NULL, MAXPATHLEN },
345 #ifdef HAVE_MULTILINK
346 { "multilink", o_bool, &multilink,
347 "Enable multilink operation", OPT_PRIO | 1 },
348 { "mp", o_bool, &multilink,
349 "Enable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 1 },
350 { "nomultilink", o_bool, &multilink,
351 "Disable multilink operation", OPT_PRIOSUB | 0 },
352 { "nomp", o_bool, &multilink,
353 "Disable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 0 },
355 { "bundle", o_string, &bundle_name,
356 "Bundle name for multilink", OPT_PRIO },
357 #endif /* HAVE_MULTILINK */
360 { "plugin", o_special, (void *)loadplugin,
361 "Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
365 { "pass-filter", o_special, setpassfilter,
366 "set filter for packets to pass", OPT_PRIO },
368 { "active-filter", o_special, setactivefilter,
369 "set filter for active pkts", OPT_PRIO },
373 { "maxoctets", o_int, &maxoctets,
374 "Set connection traffic limit",
375 OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
376 { "mo", o_int, &maxoctets,
377 "Set connection traffic limit",
378 OPT_ALIAS | OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
379 { "mo-direction", o_special, setmodir,
380 "Set direction for limit traffic (sum,in,out,max)" },
381 { "mo-timeout", o_int, &maxoctets_timeout,
382 "Check for traffic limit every N seconds", OPT_PRIO | OPT_LLIMIT | 1 },
388 #ifndef IMPLEMENTATION
389 #define IMPLEMENTATION ""
392 static char *usage_string = "\
394 Usage: %s [ options ], where options are:\n\
395 <device> Communicate over the named device\n\
396 <speed> Set the baud rate to <speed>\n\
397 <loc>:<rem> Set the local and/or remote interface IP\n\
398 addresses. Either one may be omitted.\n\
399 asyncmap <n> Set the desired async map to hex <n>\n\
400 auth Require authentication from peer\n\
401 connect <p> Invoke shell command <p> to set up the serial line\n\
402 crtscts Use hardware RTS/CTS flow control\n\
403 defaultroute Add default route through interface\n\
404 file <f> Take options from file <f>\n\
405 modem Use modem control lines\n\
406 mru <n> Set MRU value to <n> for negotiation\n\
407 See pppd(8) for more options.\n\
411 * parse_args - parse a string of arguments from the command line.
414 parse_args(int argc, char **argv)
420 privileged_option = privileged;
421 option_source = "command line";
422 option_priority = OPRIO_CMDLINE;
426 opt = find_option(arg);
428 option_error("unrecognized option '%s'", arg);
432 n = n_arguments(opt);
434 option_error("too few parameters for option %s", arg);
437 if (!process_option(opt, arg, argv))
446 * options_from_file - Read a string of options from a file,
447 * and interpret them.
450 options_from_file(char *filename, int must_exist, int check_prot, int priv)
453 int i, newline, ret, err;
459 char args[MAXARGS][MAXWORDLEN];
460 char cmd[MAXWORDLEN];
463 if (check_prot && seteuid(getuid()) == -1) {
464 option_error("unable to drop privileges to open %s: %m", filename);
467 f = fopen(filename, "r");
469 if (check_prot && seteuid(euid) == -1)
470 fatal("unable to regain privileges");
474 if (err != ENOENT && err != ENOTDIR)
475 warn("Warning: can't open options file %s: %m", filename);
478 option_error("Can't open options file %s: %m", filename);
482 oldpriv = privileged_option;
483 privileged_option = priv;
484 oldsource = option_source;
485 option_source = strdup(filename);
486 if (option_source == NULL)
487 option_source = "file";
489 while (getword(f, cmd, &newline, filename)) {
490 opt = find_option(cmd);
492 option_error("In file %s: unrecognized option '%s'",
496 n = n_arguments(opt);
497 for (i = 0; i < n; ++i) {
498 if (!getword(f, args[i], &newline, filename)) {
500 "In file %s: too few parameters for option '%s'",
506 if (!process_option(opt, cmd, argv))
513 privileged_option = oldpriv;
514 option_source = oldsource;
519 * options_from_user - See if the use has a ~/.ppprc file,
520 * and if so, interpret options from it.
523 options_from_user(void)
525 char *user, *path, *file;
530 pw = getpwuid(getuid());
531 if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
533 file = _PATH_USEROPT;
534 pl = strlen(user) + strlen(file) + 2;
537 novm("init file name");
538 slprintf(path, pl, "%s/%s", user, file);
539 option_priority = OPRIO_CFGFILE;
540 ret = options_from_file(path, 0, 1, privileged);
546 * options_for_tty - See if an options file exists for the serial
547 * device, and if so, interpret options from it.
548 * We only allow the per-tty options file to override anything from
549 * the command line if it is something that the user can't override
550 * once it has been set by root; this is done by giving configuration
551 * files a lower priority than the command line.
554 options_for_tty(void)
556 char *dev, *path, *p;
561 if ((p = strstr(dev, "/dev/")) != NULL)
563 if (dev[0] == 0 || strcmp(dev, "tty") == 0)
564 return 1; /* don't look for /etc/ppp/options.tty */
565 pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
568 novm("tty init file name");
569 slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
570 /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
571 for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
574 option_priority = OPRIO_CFGFILE;
575 ret = options_from_file(path, 0, 0, 1);
581 * options_from_list - process a string of options in a wordlist.
584 options_from_list(struct wordlist *w, int priv)
591 privileged_option = priv;
592 option_source = "secrets file";
593 option_priority = OPRIO_SECFILE;
596 opt = find_option(w->word);
598 option_error("In secrets file: unrecognized option '%s'",
602 n = n_arguments(opt);
604 for (i = 0; i < n; ++i) {
608 "In secrets file: too few parameters for option '%s'",
614 if (!process_option(opt, w0->word, argv))
625 * match_option - see if this option matches an option_t structure.
628 match_option(char *name, option_t *opt, int dowild)
630 int (*match)(char *, char **, int);
632 if (dowild != (opt->type == o_wild))
635 return strcmp(name, opt->name) == 0;
636 match = (int (*)(char *, char **, int)) opt->addr;
637 return (*match)(name, NULL, 0);
641 * find_option - scan the option lists for the various protocols
642 * looking for an entry with the given name.
643 * This could be optimized by using a hash table.
646 find_option(char *name)
649 struct option_list *list;
652 for (dowild = 0; dowild <= 1; ++dowild) {
653 for (opt = general_options; opt->name != NULL; ++opt)
654 if (match_option(name, opt, dowild))
656 for (opt = auth_options; opt->name != NULL; ++opt)
657 if (match_option(name, opt, dowild))
659 for (list = extra_options; list != NULL; list = list->next)
660 for (opt = list->options; opt->name != NULL; ++opt)
661 if (match_option(name, opt, dowild))
663 for (opt = the_channel->options; opt->name != NULL; ++opt)
664 if (match_option(name, opt, dowild))
666 for (i = 0; protocols[i] != NULL; ++i)
667 if ((opt = protocols[i]->options) != NULL)
668 for (; opt->name != NULL; ++opt)
669 if (match_option(name, opt, dowild))
676 * process_option - process one new-style option.
679 process_option(option_t *opt, char *cmd, char **argv)
684 int (*parser)(char **);
685 int (*wildp)(char *, char **, int);
686 char *optopt = (opt->type == o_wild)? "": " option";
687 int prio = option_priority;
688 option_t *mainopt = opt;
690 current_option = opt->name;
691 if ((opt->flags & OPT_PRIVFIX) && privileged_option)
693 while (mainopt->flags & OPT_PRIOSUB)
695 if (mainopt->flags & OPT_PRIO) {
696 if (prio < mainopt->priority) {
697 /* new value doesn't override old */
698 if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
699 option_error("%s%s set in %s cannot be overridden\n",
700 opt->name, optopt, mainopt->source);
705 if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
706 warn("%s%s from %s overrides command line",
707 opt->name, optopt, option_source);
710 if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
711 option_error("%s%s cannot be changed after initialization",
715 if ((opt->flags & OPT_PRIV) && !privileged_option) {
716 option_error("using the %s%s requires root privilege",
720 if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
721 option_error("%s%s is disabled", opt->name, optopt);
724 if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
725 option_error("the %s%s may not be changed in %s",
726 opt->name, optopt, option_source);
732 v = opt->flags & OPT_VALUE;
733 *(bool *)(opt->addr) = v;
734 if (opt->addr2 && (opt->flags & OPT_A2COPY))
735 *(bool *)(opt->addr2) = v;
736 else if (opt->addr2 && (opt->flags & OPT_A2CLR))
737 *(bool *)(opt->addr2) = 0;
738 else if (opt->addr2 && (opt->flags & OPT_A2CLRB))
739 *(u_char *)(opt->addr2) &= ~v;
740 else if (opt->addr2 && (opt->flags & OPT_A2OR))
741 *(u_char *)(opt->addr2) |= v;
746 if ((opt->flags & OPT_NOARG) == 0) {
747 if (!int_option(*argv, &iv))
749 if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
750 || ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
751 && !((opt->flags & OPT_ZEROOK && iv == 0))) {
752 char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
753 switch (opt->flags & OPT_LIMITS) {
755 option_error("%s value must be%s >= %d",
756 opt->name, zok, opt->lower_limit);
759 option_error("%s value must be%s <= %d",
760 opt->name, zok, opt->upper_limit);
763 option_error("%s value must be%s between %d and %d",
764 opt->name, zok, opt->lower_limit, opt->upper_limit);
770 a = opt->flags & OPT_VALUE;
772 a -= 256; /* sign extend */
774 if (opt->flags & OPT_INC)
775 iv += *(int *)(opt->addr);
776 if ((opt->flags & OPT_NOINCR) && !privileged_option) {
777 int oldv = *(int *)(opt->addr);
778 if ((opt->flags & OPT_ZEROINF) ?
779 (oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
780 option_error("%s value cannot be increased", opt->name);
784 *(int *)(opt->addr) = iv;
785 if (opt->addr2 && (opt->flags & OPT_A2COPY))
786 *(int *)(opt->addr2) = iv;
790 if (opt->flags & OPT_NOARG) {
791 v = opt->flags & OPT_VALUE;
794 } else if (!number_option(*argv, &v, 16))
796 if (opt->flags & OPT_OR)
797 v |= *(u_int32_t *)(opt->addr);
798 *(u_int32_t *)(opt->addr) = v;
799 if (opt->addr2 && (opt->flags & OPT_A2COPY))
800 *(u_int32_t *)(opt->addr2) = v;
804 if (opt->flags & OPT_STATIC) {
805 strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
807 char **optptr = (char **)(opt->addr);
810 novm("option argument");
815 /* obfuscate original argument for things like password */
816 if (opt->flags & OPT_HIDE) {
817 memset(*argv, '?', strlen(*argv));
822 case o_special_noarg:
824 parser = (int (*)(char **)) opt->addr;
826 if (!(*parser)(argv))
828 if (opt->flags & OPT_A2LIST) {
829 struct option_value *ovp, *pp;
831 ovp = malloc(sizeof(*ovp) + strlen(*argv));
833 strcpy(ovp->value, *argv);
834 ovp->source = option_source;
836 if (opt->addr2 == NULL) {
839 for (pp = opt->addr2; pp->next != NULL; pp = pp->next)
848 wildp = (int (*)(char *, char **, int)) opt->addr;
849 if (!(*wildp)(cmd, argv, 1))
855 * If addr2 wasn't used by any flag (OPT_A2COPY, etc.) but is set,
856 * treat it as a bool and set/clear it based on the OPT_A2CLR bit.
858 if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
859 |OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST|OPT_A2OR)) == 0)
860 *(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
862 mainopt->source = option_source;
863 mainopt->priority = prio;
864 mainopt->winner = opt - mainopt;
870 * override_value - if the option priorities would permit us to
871 * override the value of option, return 1 and update the priority
872 * and source of the option value. Otherwise returns 0.
875 override_value(char *option, int priority, const char *source)
879 opt = find_option(option);
882 while (opt->flags & OPT_PRIOSUB)
884 if ((opt->flags & OPT_PRIO) && priority < opt->priority)
886 opt->priority = priority;
887 opt->source = source;
893 * n_arguments - tell how many arguments an option takes
896 n_arguments(option_t *opt)
898 return (opt->type == o_bool || opt->type == o_special_noarg
899 || (opt->flags & OPT_NOARG))? 0: 1;
903 * add_options - add a list of options to the set we grok.
906 add_options(option_t *opt)
908 struct option_list *list;
910 list = malloc(sizeof(*list));
912 novm("option list entry");
914 list->next = extra_options;
915 extra_options = list;
919 * check_options - check that options are valid and consistent.
924 if (logfile_fd >= 0 && logfile_fd != log_to_fd)
929 * print_option - print out an option and its value
932 print_option(option_t *opt, option_t *mainopt, printer_func printer, void *arg)
937 if (opt->flags & OPT_NOPRINT)
941 v = opt->flags & OPT_VALUE;
942 if (*(bool *)opt->addr != v)
943 /* this can happen legitimately, e.g. lock
944 option turned off for default device */
946 printer(arg, "%s", opt->name);
949 v = opt->flags & OPT_VALUE;
952 i = *(int *)opt->addr;
953 if (opt->flags & OPT_NOARG) {
954 printer(arg, "%s", opt->name);
956 if (opt->flags & OPT_INC) {
957 for (; i > v; i -= v)
958 printer(arg, " %s", opt->name);
960 printer(arg, " # oops: %d not %d\n",
964 printer(arg, "%s %d", opt->name, i);
968 printer(arg, "%s", opt->name);
969 if ((opt->flags & OPT_NOARG) == 0)
970 printer(arg, " %x", *(u_int32_t *)opt->addr);
974 if (opt->flags & OPT_HIDE) {
977 p = (char *) opt->addr;
978 if ((opt->flags & OPT_STATIC) == 0)
981 printer(arg, "%s %q", opt->name, p);
985 case o_special_noarg:
987 if (opt->type != o_wild) {
988 printer(arg, "%s", opt->name);
989 if (n_arguments(opt) == 0)
993 if (opt->flags & OPT_A2PRINTER) {
994 void (*oprt)(option_t *, printer_func, void *);
995 oprt = (void (*)(option_t *, printer_func, void *))
997 (*oprt)(opt, printer, arg);
998 } else if (opt->flags & OPT_A2STRVAL) {
999 p = (char *) opt->addr2;
1000 if ((opt->flags & OPT_STATIC) == 0)
1002 printer(arg, "%q", p);
1003 } else if (opt->flags & OPT_A2LIST) {
1004 struct option_value *ovp;
1006 ovp = (struct option_value *) opt->addr2;
1008 printer(arg, "%q", ovp->value);
1009 if ((ovp = ovp->next) == NULL)
1011 printer(arg, "\t\t# (from %s)\n%s ",
1012 ovp->source, opt->name);
1015 printer(arg, "xxx # [don't know how to print value]");
1020 printer(arg, "# %s value (type %d\?\?)", opt->name, opt->type);
1023 printer(arg, "\t\t# (from %s)\n", mainopt->source);
1027 * print_option_list - print out options in effect from an
1031 print_option_list(option_t *opt, printer_func printer, void *arg)
1033 while (opt->name != NULL) {
1034 if (opt->priority != OPRIO_DEFAULT
1035 && opt->winner != (short int) -1)
1036 print_option(opt + opt->winner, opt, printer, arg);
1039 } while (opt->flags & OPT_PRIOSUB);
1044 * print_options - print out what options are in effect.
1047 print_options(printer_func printer, void *arg)
1049 struct option_list *list;
1052 printer(arg, "pppd options in effect:\n");
1053 print_option_list(general_options, printer, arg);
1054 print_option_list(auth_options, printer, arg);
1055 for (list = extra_options; list != NULL; list = list->next)
1056 print_option_list(list->options, printer, arg);
1057 print_option_list(the_channel->options, printer, arg);
1058 for (i = 0; protocols[i] != NULL; ++i)
1059 print_option_list(protocols[i]->options, printer, arg);
1063 * usage - print out a message telling how to use the program.
1068 if (phase == PHASE_INITIALIZE)
1069 fprintf(stderr, usage_string, VERSION, progname);
1073 * showhelp - print out usage message and exit.
1076 showhelp(char **argv)
1078 if (phase == PHASE_INITIALIZE) {
1086 * showversion - print out the version number and exit.
1089 showversion(char **argv)
1091 if (phase == PHASE_INITIALIZE) {
1092 fprintf(stdout, "pppd version %s\n", VERSION);
1099 * option_error - print a message about an error in an option.
1100 * The message is logged, and also sent to
1101 * stderr if phase == PHASE_INITIALIZE.
1104 option_error(char *fmt, ...)
1109 va_start(args, fmt);
1110 vslprintf(buf, sizeof(buf), fmt, args);
1112 if (phase == PHASE_INITIALIZE)
1113 fprintf(stderr, "%s: %s\n", progname, buf);
1114 syslog(LOG_ERR, "%s", buf);
1119 * readable - check if a file is readable by the real user.
1131 if (fstat(fd, &sbuf) != 0)
1133 if (sbuf.st_uid == uid)
1134 return sbuf.st_mode & S_IRUSR;
1135 if (sbuf.st_gid == getgid())
1136 return sbuf.st_mode & S_IRGRP;
1137 for (i = 0; i < ngroups; ++i)
1138 if (sbuf.st_gid == groups[i])
1139 return sbuf.st_mode & S_IRGRP;
1140 return sbuf.st_mode & S_IROTH;
1145 * Read a word from a file.
1146 * Words are delimited by white-space or by quotes (" or ').
1147 * Quotes, white-space and \ may be escaped with \.
1148 * \<newline> is ignored.
1151 getword(FILE *f, char *word, int *newlinep, char *filename)
1154 int quoted, comment;
1155 int value, digit, got, n;
1157 #define isoctal(c) ((c) >= '0' && (c) < '8')
1166 * First skip white-space and comments.
1174 * A newline means the end of a comment; backslash-newline
1175 * is ignored. Note that we cannot have escape && comment.
1187 * Ignore characters other than newline in a comment.
1193 * If this character is escaped, we have a word start.
1199 * If this is the escape character, look at the next character.
1207 * If this is the start of a comment, ignore the rest of the line.
1215 * A non-whitespace character is the start of a word.
1222 * Process characters until the end of the word.
1227 * This character is escaped: backslash-newline is ignored,
1228 * various other characters indicate particular values
1229 * as for C backslash-escapes.
1264 * \ddd octal sequence
1267 for (n = 0; n < 3 && isoctal(c); ++n) {
1268 value = (value << 3) + (c & 07);
1277 * \x<hex_string> sequence
1281 for (n = 0; n < 2 && isxdigit(c); ++n) {
1282 digit = toupper(c) - '0';
1284 digit += '0' + 10 - 'A';
1285 value = (value << 4) + digit;
1293 * Otherwise the character stands for itself.
1300 * Store the resulting character for the escape sequence.
1302 if (len < MAXWORDLEN) {
1313 * Backslash starts a new escape sequence.
1322 * Not escaped: check for the start or end of a quoted
1323 * section and see if we've reached the end of the word.
1331 } else if (c == '"' || c == '\'') {
1335 } else if (isspace(c) || c == '#') {
1341 * An ordinary character: store it in the word and get another.
1343 if (len < MAXWORDLEN) {
1350 word[MAXWORDLEN-1] = 0; /* make sure word is null-terminated */
1353 * End of the word: check for errors.
1359 option_error("Error reading %s: %m", filename);
1363 * If len is zero, then we didn't find a word before the
1369 option_error("warning: quoted word runs to end of file (%.20s...)",
1374 * Warn if the word was too long, and append a terminating null.
1376 if (len >= MAXWORDLEN) {
1377 option_error("warning: word in file %s too long (%.20s...)",
1379 len = MAXWORDLEN - 1;
1390 * number_option - parse an unsigned numeric parameter for an option.
1393 number_option(char *str, u_int32_t *valp, int base)
1397 *valp = strtoul(str, &ptr, base);
1399 option_error("invalid numeric parameter '%s' for %s option",
1400 str, current_option);
1408 * int_option - like number_option, but valp is int *,
1409 * the base is assumed to be 0, and *valp is not changed
1410 * if there is an error.
1413 int_option(char *str, int *valp)
1417 if (!number_option(str, &v, 0))
1425 * The following procedures parse options.
1429 * readfile - take commands from a file.
1432 readfile(char **argv)
1434 return options_from_file(*argv, 1, 1, privileged_option);
1438 * callfile - take commands from /etc/ppp/peers/<name>.
1439 * Name may not contain /../, start with / or ../, or end in /..
1442 callfile(char **argv)
1444 char *fname, *arg, *p;
1449 if (arg[0] == '/' || arg[0] == 0)
1452 for (p = arg; *p != 0; ) {
1453 if (p[0] == '.' && p[1] == '.' && (p[2] == '/' || p[2] == 0)) {
1457 while (*p != '/' && *p != 0)
1464 option_error("call option value may not contain .. or start with /");
1468 l = strlen(arg) + strlen(_PATH_PEERFILES) + 1;
1469 if ((fname = (char *) malloc(l)) == NULL)
1470 novm("call file name");
1471 slprintf(fname, l, "%s%s", _PATH_PEERFILES, arg);
1472 script_setenv("CALL_FILE", arg, 0);
1474 ok = options_from_file(fname, 1, 1, 1);
1482 * setpassfilter - Set the pass filter for packets
1485 setpassfilter(char **argv)
1490 pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1491 if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
1492 option_error("error in pass-filter expression: %s\n",
1502 * setactivefilter - Set the active filter for packets
1505 setactivefilter(char **argv)
1510 pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
1511 if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
1512 option_error("error in active-filter expression: %s\n",
1523 * setdomain - Set domain name to append to hostname
1526 setdomain(char **argv)
1528 gethostname(hostname, MAXNAMELEN);
1531 strncat(hostname, ".", MAXNAMELEN - strlen(hostname));
1532 domain = hostname + strlen(hostname);
1533 strncat(hostname, *argv, MAXNAMELEN - strlen(hostname));
1535 hostname[MAXNAMELEN-1] = 0;
1540 setlogfile(char **argv)
1546 if (!privileged_option && seteuid(getuid()) == -1) {
1547 option_error("unable to drop permissions to open %s: %m", *argv);
1550 fd = open(*argv, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0644);
1551 if (fd < 0 && errno == EEXIST)
1552 fd = open(*argv, O_WRONLY | O_APPEND);
1554 if (!privileged_option && seteuid(euid) == -1)
1555 fatal("unable to regain privileges: %m");
1558 option_error("Can't open log file %s: %m", *argv);
1561 strlcpy(logfile_name, *argv, sizeof(logfile_name));
1562 if (logfile_fd >= 0)
1572 setmodir(char **argv)
1576 if(!strcmp(*argv,"in")) {
1577 maxoctets_dir = PPP_OCTETS_DIRECTION_IN;
1578 } else if (!strcmp(*argv,"out")) {
1579 maxoctets_dir = PPP_OCTETS_DIRECTION_OUT;
1580 } else if (!strcmp(*argv,"max")) {
1581 maxoctets_dir = PPP_OCTETS_DIRECTION_MAXOVERAL;
1583 maxoctets_dir = PPP_OCTETS_DIRECTION_SUM;
1591 loadplugin(char **argv)
1600 if (strchr(arg, '/') == 0) {
1601 const char *base = _PATH_PLUGIN;
1602 int l = strlen(base) + strlen(arg) + 2;
1605 novm("plugin file path");
1606 strlcpy(path, base, l);
1607 strlcat(path, "/", l);
1608 strlcat(path, arg, l);
1610 handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
1614 option_error("%s", err);
1615 option_error("Couldn't load plugin %s", arg);
1618 init = (void (*)(void))dlsym(handle, "plugin_init");
1620 option_error("%s has no initialization entry point", arg);
1623 vers = (const char *) dlsym(handle, "pppd_version");
1625 warn("Warning: plugin %s has no version information", arg);
1626 } else if (strcmp(vers, VERSION) != 0) {
1627 option_error("Plugin %s is for pppd version %s, this is %s",
1628 arg, vers, VERSION);
1631 info("Plugin %s loaded.", arg);
1645 * Set an environment variable specified by the user.
1648 user_setenv(char **argv)
1650 char *arg = argv[0];
1652 struct userenv *uep, **insp;
1654 if ((eqp = strchr(arg, '=')) == NULL) {
1655 option_error("missing = in name=value: %s", arg);
1659 option_error("missing variable name: %s", arg);
1662 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1663 int nlen = strlen(uep->ue_name);
1664 if (nlen == (eqp - arg) &&
1665 strncmp(arg, uep->ue_name, nlen) == 0)
1668 /* Ignore attempts by unprivileged users to override privileged sources */
1669 if (uep != NULL && !privileged_option && uep->ue_priv)
1671 /* The name never changes, so allocate it with the structure */
1673 uep = malloc(sizeof (*uep) + (eqp-arg));
1674 strncpy(uep->ue_name, arg, eqp-arg);
1675 uep->ue_name[eqp-arg] = '\0';
1676 uep->ue_next = NULL;
1677 insp = &userenv_list;
1678 while (*insp != NULL)
1679 insp = &(*insp)->ue_next;
1682 struct userenv *uep2;
1683 for (uep2 = userenv_list; uep2 != NULL; uep2 = uep2->ue_next) {
1684 if (uep2 != uep && !uep2->ue_isset)
1687 if (uep2 == NULL && !uep->ue_isset)
1688 find_option("unset")->flags |= OPT_NOPRINT;
1689 free(uep->ue_value);
1692 uep->ue_priv = privileged_option;
1693 uep->ue_source = option_source;
1694 uep->ue_value = strdup(eqp + 1);
1695 curopt->flags &= ~OPT_NOPRINT;
1700 user_setprint(option_t *opt, printer_func printer, void *arg)
1702 struct userenv *uep, *uepnext;
1704 uepnext = userenv_list;
1705 while (uepnext != NULL && !uepnext->ue_isset)
1706 uepnext = uepnext->ue_next;
1707 while ((uep = uepnext) != NULL) {
1708 uepnext = uep->ue_next;
1709 while (uepnext != NULL && !uepnext->ue_isset)
1710 uepnext = uepnext->ue_next;
1711 (*printer)(arg, "%s=%s", uep->ue_name, uep->ue_value);
1712 if (uepnext != NULL)
1713 (*printer)(arg, "\t\t# (from %s)\n%s ", uep->ue_source, opt->name);
1715 opt->source = uep->ue_source;
1720 user_unsetenv(char **argv)
1722 struct userenv *uep, **insp;
1723 char *arg = argv[0];
1725 if (strchr(arg, '=') != NULL) {
1726 option_error("unexpected = in name: %s", arg);
1730 option_error("missing variable name for unset");
1733 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1734 if (strcmp(arg, uep->ue_name) == 0)
1737 /* Ignore attempts by unprivileged users to override privileged sources */
1738 if (uep != NULL && !privileged_option && uep->ue_priv)
1740 /* The name never changes, so allocate it with the structure */
1742 uep = malloc(sizeof (*uep) + strlen(arg));
1743 strcpy(uep->ue_name, arg);
1744 uep->ue_next = NULL;
1745 insp = &userenv_list;
1746 while (*insp != NULL)
1747 insp = &(*insp)->ue_next;
1750 struct userenv *uep2;
1751 for (uep2 = userenv_list; uep2 != NULL; uep2 = uep2->ue_next) {
1752 if (uep2 != uep && uep2->ue_isset)
1755 if (uep2 == NULL && uep->ue_isset)
1756 find_option("set")->flags |= OPT_NOPRINT;
1757 free(uep->ue_value);
1760 uep->ue_priv = privileged_option;
1761 uep->ue_source = option_source;
1762 uep->ue_value = NULL;
1763 curopt->flags &= ~OPT_NOPRINT;
1768 user_unsetprint(option_t *opt, printer_func printer, void *arg)
1770 struct userenv *uep, *uepnext;
1772 uepnext = userenv_list;
1773 while (uepnext != NULL && uepnext->ue_isset)
1774 uepnext = uepnext->ue_next;
1775 while ((uep = uepnext) != NULL) {
1776 uepnext = uep->ue_next;
1777 while (uepnext != NULL && uepnext->ue_isset)
1778 uepnext = uepnext->ue_next;
1779 (*printer)(arg, "%s", uep->ue_name);
1780 if (uepnext != NULL)
1781 (*printer)(arg, "\t\t# (from %s)\n%s ", uep->ue_source, opt->name);
1783 opt->source = uep->ue_source;