2 * Copyright (c) 2002-2003 M. Warner Losh.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * DEVD control daemon.
32 // o devd.conf and devd man pages need a lot of help:
33 // - devd needs to document the unix domain socket
34 // - devd.conf needs more details on the supported statements.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/socket.h>
42 #include <sys/sysctl.h>
43 #include <sys/types.h>
66 #include "devd.h" /* C compatible definitions */
67 #include "devd.hh" /* C++ class definitions */
69 #define PIPE "/var/run/devd.pipe"
70 #define CF "/etc/devd.conf"
71 #define SYSCTL "hw.bus.devctl_disable"
78 static const char notify = '!';
79 static const char nomatch = '?';
80 static const char attach = '+';
81 static const char detach = '-';
83 static struct pidfh *pfh;
88 int romeo_must_die = 0;
90 static const char *configfile = CF;
92 static void event_loop(void);
93 static void usage(void);
95 template <class T> void
96 delete_and_clear(vector<T *> &v)
98 typename vector<T *>::const_iterator i;
100 for (i = v.begin(); i != v.end(); ++i)
107 event_proc::event_proc() : _prio(-1)
112 event_proc::~event_proc()
114 delete_and_clear(_epsvec);
118 event_proc::add(eps *eps)
120 _epsvec.push_back(eps);
124 event_proc::matches(config &c) const
126 vector<eps *>::const_iterator i;
128 for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
129 if (!(*i)->do_match(c))
135 event_proc::run(config &c) const
137 vector<eps *>::const_iterator i;
139 for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
140 if (!(*i)->do_action(c))
145 action::action(const char *cmd)
157 action::do_action(config &c)
159 string s = c.expand_string(_cmd);
161 fprintf(stderr, "Executing '%s'\n", s.c_str());
166 match::match(config &c, const char *var, const char *re)
171 if (!c.expand_string(string(re)).empty() &&
172 c.expand_string(string(re)).at(0) == '!') {
173 _re.append(c.expand_string(string(re)).substr(1));
176 _re.append(c.expand_string(string(re)));
180 regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
189 match::do_match(config &c)
191 string value = c.get_variable(_var);
195 fprintf(stderr, "Testing %s=%s against %s, invert=%d\n",
196 _var.c_str(), value.c_str(), _re.c_str(), _inv);
198 retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
200 retval = (retval == 0) ? 1 : 0;
205 #include <sys/sockio.h>
207 #include <net/if_media.h>
209 media::media(config &, const char *var, const char *type)
210 : _var(var), _type(-1)
212 static struct ifmedia_description media_types[] = {
213 { IFM_ETHER, "Ethernet" },
214 { IFM_TOKEN, "Tokenring" },
215 { IFM_FDDI, "FDDI" },
216 { IFM_IEEE80211, "802.11" },
218 { IFM_CARP, "CARP" },
222 for (int i = 0; media_types[i].ifmt_string != NULL; ++i)
223 if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
224 _type = media_types[i].ifmt_word;
234 media::do_match(config &c)
237 struct ifmediareq ifmr;
241 // Since we can be called from both a device attach/detach
242 // context where device-name is defined and what we want,
243 // as well as from a link status context, where subsystem is
244 // the name of interest, first try device-name and fall back
245 // to subsystem if none exists.
246 value = c.get_variable("device-name");
247 if (value.length() == 0)
248 value = c.get_variable("subsystem");
250 fprintf(stderr, "Testing media type of %s against 0x%x\n",
251 value.c_str(), _type);
255 s = socket(PF_INET, SOCK_DGRAM, 0);
257 memset(&ifmr, 0, sizeof(ifmr));
258 strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
260 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
261 ifmr.ifm_status & IFM_AVALID) {
263 fprintf(stderr, "%s has media type 0x%x\n",
264 value.c_str(), IFM_TYPE(ifmr.ifm_active));
265 retval = (IFM_TYPE(ifmr.ifm_active) == _type);
266 } else if (_type == -1) {
268 fprintf(stderr, "%s has unknown media type\n",
278 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
279 const string var_list::nothing = "";
282 var_list::get_variable(const string &var) const
284 map<string, string>::const_iterator i;
287 if (i == _vars.end())
288 return (var_list::bogus);
293 var_list::is_set(const string &var) const
295 return (_vars.find(var) != _vars.end());
299 var_list::set_variable(const string &var, const string &val)
302 fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
310 delete_and_clear(_var_list_table);
311 delete_and_clear(_attach_list);
312 delete_and_clear(_detach_list);
313 delete_and_clear(_nomatch_list);
314 delete_and_clear(_notify_list);
318 config::parse_one_file(const char *fn)
321 fprintf(stderr, "Parsing %s\n", fn);
322 yyin = fopen(fn, "r");
324 err(1, "Cannot open config file %s", fn);
327 errx(1, "Cannot parse %s at line %d", fn, lineno);
332 config::parse_files_in_dir(const char *dirname)
339 fprintf(stderr, "Parsing files in %s\n", dirname);
340 dirp = opendir(dirname);
343 readdir(dirp); /* Skip . */
344 readdir(dirp); /* Skip .. */
345 while ((dp = readdir(dirp)) != NULL) {
346 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
347 snprintf(path, sizeof(path), "%s/%s",
348 dirname, dp->d_name);
349 parse_one_file(path);
357 int operator()(event_proc *const&l1, event_proc *const&l2) const
359 return (l1->get_priority() > l2->get_priority());
364 config::sort_vector(vector<event_proc *> &v)
366 stable_sort(v.begin(), v.end(), epv_greater());
372 vector<string>::const_iterator i;
374 parse_one_file(configfile);
375 for (i = _dir_list.begin(); i != _dir_list.end(); ++i)
376 parse_files_in_dir((*i).c_str());
377 sort_vector(_attach_list);
378 sort_vector(_detach_list);
379 sort_vector(_nomatch_list);
380 sort_vector(_notify_list);
384 config::open_pidfile()
390 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
393 errx(1, "devd already running, pid: %d", (int)otherpid);
394 warn("cannot open pid file");
399 config::write_pidfile()
406 config::remove_pidfile()
413 config::add_attach(int prio, event_proc *p)
415 p->set_priority(prio);
416 _attach_list.push_back(p);
420 config::add_detach(int prio, event_proc *p)
422 p->set_priority(prio);
423 _detach_list.push_back(p);
427 config::add_directory(const char *dir)
429 _dir_list.push_back(string(dir));
433 config::add_nomatch(int prio, event_proc *p)
435 p->set_priority(prio);
436 _nomatch_list.push_back(p);
440 config::add_notify(int prio, event_proc *p)
442 p->set_priority(prio);
443 _notify_list.push_back(p);
447 config::set_pidfile(const char *fn)
449 _pidfile = string(fn);
453 config::push_var_table()
458 _var_list_table.push_back(vl);
460 fprintf(stderr, "Pushing table\n");
464 config::pop_var_table()
466 delete _var_list_table.back();
467 _var_list_table.pop_back();
469 fprintf(stderr, "Popping table\n");
473 config::set_variable(const char *var, const char *val)
475 _var_list_table.back()->set_variable(var, val);
479 config::get_variable(const string &var)
481 vector<var_list *>::reverse_iterator i;
483 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) {
484 if ((*i)->is_set(var))
485 return ((*i)->get_variable(var));
487 return (var_list::nothing);
491 config::is_id_char(char ch) const
493 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
498 config::expand_one(const char *&src, string &dst)
501 string buffer, varstr;
506 dst.append(src++, 1);
511 // Not sure if I want to support this or not, so for now we just pass
516 /* If the string ends before ) is matched , return. */
517 while (count > 0 && *src) {
520 else if (*src == '(')
522 dst.append(src++, 1);
528 if (!isalpha(*src)) {
530 dst.append(src++, 1);
534 // $var -> replace with value
536 buffer.append(src++, 1);
537 } while (is_id_char(*src));
538 buffer.append("", 1);
539 varstr = get_variable(buffer.c_str());
544 config::expand_string(const string &s)
552 expand_one(src, dst);
554 dst.append(src++, 1);
562 config::chop_var(char *&buffer, char *&lhs, char *&rhs)
568 walker = lhs = buffer;
569 while (is_id_char(*walker))
574 if (*walker == '"') {
577 while (*walker && *walker != '"')
585 while (*walker && !isspace(*walker))
591 while (isspace(*walker))
599 config::set_vars(char *buffer)
605 if (!chop_var(buffer, lhs, rhs))
607 set_variable(lhs, rhs);
613 config::find_and_execute(char type)
615 vector<event_proc *> *l;
616 vector<event_proc *>::const_iterator i;
640 fprintf(stderr, "Processing %s event\n", s);
641 for (i = l->begin(); i != l->end(); ++i) {
642 if ((*i)->matches(*this)) {
652 process_event(char *buffer)
659 fprintf(stderr, "Processing event '%s'\n", buffer);
661 cfg.push_var_table();
662 // No match doesn't have a device, and the format is a little
663 // different, so handle it separately.
666 sp = cfg.set_vars(sp);
669 //? at location pnp-info on bus
670 sp = strchr(sp, ' ');
672 return; /* Can't happen? */
674 if (strncmp(sp, "at ", 3) == 0)
676 sp = cfg.set_vars(sp);
677 if (strncmp(sp, "on ", 3) == 0)
678 cfg.set_variable("bus", sp + 3);
680 case attach: /*FALLTHROUGH*/
682 sp = strchr(sp, ' ');
684 return; /* Can't happen? */
686 cfg.set_variable("device-name", buffer);
687 if (strncmp(sp, "at ", 3) == 0)
689 sp = cfg.set_vars(sp);
690 if (strncmp(sp, "on ", 3) == 0)
691 cfg.set_variable("bus", sp + 3);
695 cfg.find_and_execute(type);
700 create_socket(const char *name)
703 struct sockaddr_un sun;
705 if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
707 bzero(&sun, sizeof(sun));
708 sun.sun_family = AF_UNIX;
709 strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
710 slen = SUN_LEN(&sun);
712 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
714 if (bind(fd, (struct sockaddr *) & sun, slen) < 0)
717 chown(name, 0, 0); /* XXX - root.wheel */
722 unsigned int max_clients = 10; /* Default, can be overriden on cmdline. */
723 unsigned int num_clients;
727 notify_clients(const char *data, int len)
729 list<int>::iterator i;
732 * Deliver the data to all clients. Throw clients overboard at the
733 * first sign of trouble. This reaps clients who've died or closed
734 * their sockets, and also clients who are alive but failing to keep up
735 * (or who are maliciously not reading, to consume buffer space in
736 * kernel memory or tie up the limited number of available connections).
738 for (i = clients.begin(); i != clients.end(); ) {
739 if (write(*i, data, len) != len) {
742 i = clients.erase(i);
753 list<int>::iterator i;
756 * Check all existing clients to see if any of them have disappeared.
757 * Normally we reap clients when we get an error trying to send them an
758 * event. This check eliminates the problem of an ever-growing list of
759 * zombie clients because we're never writing to them on a system
760 * without frequent device-change activity.
763 for (i = clients.begin(); i != clients.end(); ) {
765 s = poll(&pfd, 1, 0);
766 if ((s < 0 && s != EINTR ) ||
767 (s > 0 && (pfd.revents & POLLHUP))) {
770 i = clients.erase(i);
782 * First go reap any zombie clients, then accept the connection, and
783 * shut down the read side to stop clients from consuming kernel memory
784 * by sending large buffers full of data we'll never read.
787 s = accept(fd, NULL, NULL);
789 shutdown(s, SHUT_RD);
790 clients.push_back(s);
800 char buffer[DEVCTL_MAXBUF];
802 int server_fd, max_fd;
807 fd = open(PATH_DEVCTL, O_RDONLY);
809 err(1, "Can't open devctl device %s", PATH_DEVCTL);
810 if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
811 err(1, "Can't set close-on-exec flag on devctl");
812 server_fd = create_socket(PIPE);
814 max_fd = max(fd, server_fd) + 1;
818 if (!once && !dflag && !nflag) {
819 // Check to see if we have any events pending.
824 rv = select(fd + 1, &fds, &fds, &fds, &tv);
825 // No events -> we've processed all pending events
828 fprintf(stderr, "Calling daemon\n");
829 cfg.remove_pidfile();
837 * When we've already got the max number of clients, stop
838 * accepting new connections (don't put server_fd in the set),
839 * shrink the accept() queue to reject connections quickly, and
840 * poll the existing clients more often, so that we notice more
841 * quickly when any of them disappear to free up client slots.
845 if (num_clients < max_clients) {
847 listen(server_fd, max_clients);
850 FD_SET(server_fd, &fds);
855 listen(server_fd, 0);
861 rv = select(max_fd, &fds, NULL, NULL, &tv);
868 if (FD_ISSET(fd, &fds)) {
869 rv = read(fd, buffer, sizeof(buffer) - 1);
871 notify_clients(buffer, rv);
873 while (buffer[--rv] == '\n')
875 process_event(buffer);
884 if (FD_ISSET(server_fd, &fds))
885 new_client(server_fd);
891 * functions that the parser uses.
894 add_attach(int prio, event_proc *p)
896 cfg.add_attach(prio, p);
900 add_detach(int prio, event_proc *p)
902 cfg.add_detach(prio, p);
906 add_directory(const char *dir)
908 cfg.add_directory(dir);
909 free(const_cast<char *>(dir));
913 add_nomatch(int prio, event_proc *p)
915 cfg.add_nomatch(prio, p);
919 add_notify(int prio, event_proc *p)
921 cfg.add_notify(prio, p);
925 add_to_event_proc(event_proc *ep, eps *eps)
928 ep = new event_proc();
934 new_action(const char *cmd)
936 eps *e = new action(cmd);
937 free(const_cast<char *>(cmd));
942 new_match(const char *var, const char *re)
944 eps *e = new match(cfg, var, re);
945 free(const_cast<char *>(var));
946 free(const_cast<char *>(re));
951 new_media(const char *var, const char *re)
953 eps *e = new media(cfg, var, re);
954 free(const_cast<char *>(var));
955 free(const_cast<char *>(re));
960 set_pidfile(const char *name)
962 cfg.set_pidfile(name);
963 free(const_cast<char *>(name));
967 set_variable(const char *var, const char *val)
969 cfg.set_variable(var, val);
970 free(const_cast<char *>(var));
971 free(const_cast<char *>(val));
986 fprintf(stderr, "usage: %s [-Ddn] [-l connlimit] [-f file]\n",
998 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
999 errx(1, "devctl sysctl missing from kernel!");
1001 warnx("Setting " SYSCTL " to 0");
1003 sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
1011 main(int argc, char **argv)
1015 check_devd_enabled();
1016 while ((ch = getopt(argc, argv, "Ddf:l:n")) != -1) {
1025 configfile = optarg;
1028 max_clients = MAX(1, strtoul(optarg, NULL, 0));
1039 if (!dflag && nflag) {
1042 cfg.write_pidfile();
1044 signal(SIGPIPE, SIG_IGN);
1045 signal(SIGHUP, gensighand);
1046 signal(SIGINT, gensighand);
1047 signal(SIGTERM, gensighand);