1 /*-
2 * Copyright (c) 2002-2010 M. Warner Losh.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 * my_system is a variation on lib/libc/stdlib/system.c:
27 *
28 * Copyright (c) 1988, 1993
29 * The Regents of the University of California. All rights reserved.
30 *
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions
33 * are met:
34 * 1. Redistributions of source code must retain the above copyright
35 * notice, this list of conditions and the following disclaimer.
36 * 2. Redistributions in binary form must reproduce the above copyright
37 * notice, this list of conditions and the following disclaimer in the
38 * documentation and/or other materials provided with the distribution.
39 * 3. Neither the name of the University nor the names of its contributors
40 * may be used to endorse or promote products derived from this software
41 * without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 *
55 * $FreeBSD: head/sbin/devd/devd.cc 270004 2014-08-14 22:33:56Z asomers $
56 */
57
58 /*
59 * DEVD control daemon.
60 */
61
62 // TODO list:
63 // o devd.conf and devd man pages need a lot of help:
64 // - devd needs to document the unix domain socket
65 // - devd.conf needs more details on the supported statements.
66
67 #include <sys/param.h>
68 #include <sys/socket.h>
69 #include <sys/stat.h>
70 #include <sys/sysctl.h>
71 #include <sys/types.h>
72 #include <sys/wait.h>
73 #include <sys/un.h>
74
75 #include <cctype>
76 #include <cerrno>
77 #include <cstdlib>
78 #include <cstdio>
79 #include <csignal>
80 #include <cstring>
81 #include <cstdarg>
82
83 #include <dirent.h>
84 #include <err.h>
85 #include <fcntl.h>
86 #include <libutil.h>
87 #include <paths.h>
88 #include <poll.h>
89 #include <regex.h>
90 #include <syslog.h>
91 #include <unistd.h>
92
93 #include <algorithm>
94 #include <map>
95 #include <string>
96 #include <list>
97 #include <vector>
98
99 #include "devd.h" /* C compatible definitions */
100 #include "devd.hh" /* C++ class definitions */
101
102 #define STREAMPIPE "/var/run/devd.pipe"
103 #define SEQPACKETPIPE "/var/run/devd.seqpacket.pipe"
104 #define CF "/etc/devd.conf"
105 #define SYSCTL "hw.bus.devctl_disable"
106
107 /*
108 * Since the client socket is nonblocking, we must increase its send buffer to
109 * handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive
110 * buffer, so the client can't increate the buffersize by itself.
111 *
112 * For example, when creating a ZFS pool, devd emits one 165 character
113 * resource.fs.zfs.statechange message for each vdev in the pool. A 64k
114 * buffer has enough space for almost 400 drives, which would be very large but
115 * not impossibly large pool. A 128k buffer has enough space for 794 drives,
116 * which is more than can fit in a rack with modern technology.
117 */
118 #define CLIENT_BUFSIZE 131072
119
120 using namespace std;
121
122 typedef struct client {
123 int fd;
124 int socktype;
125 } client_t;
126
127 extern FILE *yyin;
128 extern int lineno;
129
130 static const char notify = '!';
131 static const char nomatch = '?';
132 static const char attach = '+';
133 static const char detach = '-';
134
135 static struct pidfh *pfh;
136
137 static int no_daemon = 0;
138 static int daemonize_quick = 0;
139 static int quiet_mode = 0;
140 static unsigned total_events = 0;
141 static volatile sig_atomic_t got_siginfo = 0;
142 static volatile sig_atomic_t romeo_must_die = 0;
143
144 static const char *configfile = CF;
145
146 static void devdlog(int priority, const char* message, ...)
147 __printflike(2, 3);
148 static void event_loop(void);
149 static void usage(void);
150
151 template <class T> void
delete_and_clear(vector<T * > & v)152 delete_and_clear(vector<T *> &v)
153 {
154 typename vector<T *>::const_iterator i;
155
156 for (i = v.begin(); i != v.end(); ++i)
157 delete *i;
158 v.clear();
159 }
160
161 config cfg;
162
event_proc()163 event_proc::event_proc() : _prio(-1)
164 {
165 _epsvec.reserve(4);
166 }
167
~event_proc()168 event_proc::~event_proc()
169 {
170 delete_and_clear(_epsvec);
171 }
172
173 void
add(eps * eps)174 event_proc::add(eps *eps)
175 {
176 _epsvec.push_back(eps);
177 }
178
179 bool
matches(config & c) const180 event_proc::matches(config &c) const
181 {
182 vector<eps *>::const_iterator i;
183
184 for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
185 if (!(*i)->do_match(c))
186 return (false);
187 return (true);
188 }
189
190 bool
run(config & c) const191 event_proc::run(config &c) const
192 {
193 vector<eps *>::const_iterator i;
194
195 for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
196 if (!(*i)->do_action(c))
197 return (false);
198 return (true);
199 }
200
action(const char * cmd)201 action::action(const char *cmd)
202 : _cmd(cmd)
203 {
204 // nothing
205 }
206
~action()207 action::~action()
208 {
209 // nothing
210 }
211
212 static int
my_system(const char * command)213 my_system(const char *command)
214 {
215 pid_t pid, savedpid;
216 int pstat;
217 struct sigaction ign, intact, quitact;
218 sigset_t newsigblock, oldsigblock;
219
220 if (!command) /* just checking... */
221 return (1);
222
223 /*
224 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
225 * existing signal dispositions.
226 */
227 ign.sa_handler = SIG_IGN;
228 ::sigemptyset(&ign.sa_mask);
229 ign.sa_flags = 0;
230 ::sigaction(SIGINT, &ign, &intact);
231 ::sigaction(SIGQUIT, &ign, &quitact);
232 ::sigemptyset(&newsigblock);
233 ::sigaddset(&newsigblock, SIGCHLD);
234 ::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
235 switch (pid = ::fork()) {
236 case -1: /* error */
237 break;
238 case 0: /* child */
239 /*
240 * Restore original signal dispositions and exec the command.
241 */
242 ::sigaction(SIGINT, &intact, NULL);
243 ::sigaction(SIGQUIT, &quitact, NULL);
244 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
245 /*
246 * Close the PID file, and all other open descriptors.
247 * Inherit std{in,out,err} only.
248 */
249 cfg.close_pidfile();
250 ::closefrom(3);
251 ::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
252 ::_exit(127);
253 default: /* parent */
254 savedpid = pid;
255 do {
256 pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0);
257 } while (pid == -1 && errno == EINTR);
258 break;
259 }
260 ::sigaction(SIGINT, &intact, NULL);
261 ::sigaction(SIGQUIT, &quitact, NULL);
262 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
263 return (pid == -1 ? -1 : pstat);
264 }
265
266 bool
do_action(config & c)267 action::do_action(config &c)
268 {
269 string s = c.expand_string(_cmd.c_str());
270 devdlog(LOG_INFO, "Executing '%s'\n", s.c_str());
271 my_system(s.c_str());
272 return (true);
273 }
274
match(config & c,const char * var,const char * re)275 match::match(config &c, const char *var, const char *re) :
276 _inv(re[0] == '!'),
277 _var(var),
278 _re(c.expand_string(_inv ? re + 1 : re, "^", "$"))
279 {
280 regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
281 }
282
~match()283 match::~match()
284 {
285 regfree(&_regex);
286 }
287
288 bool
do_match(config & c)289 match::do_match(config &c)
290 {
291 const string &value = c.get_variable(_var);
292 bool retval;
293
294 /*
295 * This function gets called WAY too often to justify calling syslog()
296 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it
297 * can consume excessive amounts of systime inside of connect(). Only
298 * log when we're in -d mode.
299 */
300 if (no_daemon) {
301 devdlog(LOG_DEBUG, "Testing %s=%s against %s, invert=%d\n",
302 _var.c_str(), value.c_str(), _re.c_str(), _inv);
303 }
304
305 retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
306 if (_inv == 1)
307 retval = (retval == 0) ? 1 : 0;
308
309 return (retval);
310 }
311
312 #include <sys/sockio.h>
313 #include <net/if.h>
314 #include <net/if_media.h>
315
media(config &,const char * var,const char * type)316 media::media(config &, const char *var, const char *type)
317 : _var(var), _type(-1)
318 {
319 static struct ifmedia_description media_types[] = {
320 { IFM_ETHER, "Ethernet" },
321 { IFM_IEEE80211, "802.11" },
322 { IFM_ATM, "ATM" },
323 { IFM_CARP, "CARP" },
324 { -1, "unknown" },
325 { 0, NULL },
326 };
327 for (int i = 0; media_types[i].ifmt_string != NULL; ++i)
328 if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
329 _type = media_types[i].ifmt_word;
330 break;
331 }
332 }
333
~media()334 media::~media()
335 {
336 }
337
338 bool
do_match(config & c)339 media::do_match(config &c)
340 {
341 string value;
342 struct ifmediareq ifmr;
343 bool retval;
344 int s;
345
346 // Since we can be called from both a device attach/detach
347 // context where device-name is defined and what we want,
348 // as well as from a link status context, where subsystem is
349 // the name of interest, first try device-name and fall back
350 // to subsystem if none exists.
351 value = c.get_variable("device-name");
352 if (value.empty())
353 value = c.get_variable("subsystem");
354 devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n",
355 value.c_str(), _type);
356
357 retval = false;
358
359 s = socket(PF_INET, SOCK_DGRAM, 0);
360 if (s >= 0) {
361 memset(&ifmr, 0, sizeof(ifmr));
362 strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
363
364 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
365 ifmr.ifm_status & IFM_AVALID) {
366 devdlog(LOG_DEBUG, "%s has media type 0x%x\n",
367 value.c_str(), IFM_TYPE(ifmr.ifm_active));
368 retval = (IFM_TYPE(ifmr.ifm_active) == _type);
369 } else if (_type == -1) {
370 devdlog(LOG_DEBUG, "%s has unknown media type\n",
371 value.c_str());
372 retval = true;
373 }
374 close(s);
375 }
376
377 return (retval);
378 }
379
380 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
381 const string var_list::nothing = "";
382
383 const string &
get_variable(const string & var) const384 var_list::get_variable(const string &var) const
385 {
386 map<string, string>::const_iterator i;
387
388 i = _vars.find(var);
389 if (i == _vars.end())
390 return (var_list::bogus);
391 return (i->second);
392 }
393
394 bool
is_set(const string & var) const395 var_list::is_set(const string &var) const
396 {
397 return (_vars.find(var) != _vars.end());
398 }
399
400 void
set_variable(const string & var,const string & val)401 var_list::set_variable(const string &var, const string &val)
402 {
403 /*
404 * This function gets called WAY too often to justify calling syslog()
405 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it
406 * can consume excessive amounts of systime inside of connect(). Only
407 * log when we're in -d mode.
408 */
409 if (no_daemon)
410 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str());
411 _vars[var] = val;
412 }
413
414 void
reset(void)415 config::reset(void)
416 {
417 _dir_list.clear();
418 delete_and_clear(_var_list_table);
419 delete_and_clear(_attach_list);
420 delete_and_clear(_detach_list);
421 delete_and_clear(_nomatch_list);
422 delete_and_clear(_notify_list);
423 }
424
425 void
parse_one_file(const char * fn)426 config::parse_one_file(const char *fn)
427 {
428 devdlog(LOG_DEBUG, "Parsing %s\n", fn);
429 yyin = fopen(fn, "r");
430 if (yyin == NULL)
431 err(1, "Cannot open config file %s", fn);
432 lineno = 1;
433 if (yyparse() != 0)
434 errx(1, "Cannot parse %s at line %d", fn, lineno);
435 fclose(yyin);
436 }
437
438 void
parse_files_in_dir(const char * dirname)439 config::parse_files_in_dir(const char *dirname)
440 {
441 DIR *dirp;
442 struct dirent *dp;
443 char path[PATH_MAX];
444
445 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname);
446 dirp = opendir(dirname);
447 if (dirp == NULL)
448 return;
449 readdir(dirp); /* Skip . */
450 readdir(dirp); /* Skip .. */
451 while ((dp = readdir(dirp)) != NULL) {
452 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
453 snprintf(path, sizeof(path), "%s/%s",
454 dirname, dp->d_name);
455 parse_one_file(path);
456 }
457 }
458 closedir(dirp);
459 }
460
461 class epv_greater {
462 public:
operator ()(event_proc * const & l1,event_proc * const & l2) const463 int operator()(event_proc *const&l1, event_proc *const&l2) const
464 {
465 return (l1->get_priority() > l2->get_priority());
466 }
467 };
468
469 void
sort_vector(vector<event_proc * > & v)470 config::sort_vector(vector<event_proc *> &v)
471 {
472 stable_sort(v.begin(), v.end(), epv_greater());
473 }
474
475 void
parse(void)476 config::parse(void)
477 {
478 vector<string>::const_iterator i;
479
480 parse_one_file(configfile);
481 for (i = _dir_list.begin(); i != _dir_list.end(); ++i)
482 parse_files_in_dir((*i).c_str());
483 sort_vector(_attach_list);
484 sort_vector(_detach_list);
485 sort_vector(_nomatch_list);
486 sort_vector(_notify_list);
487 }
488
489 void
open_pidfile()490 config::open_pidfile()
491 {
492 pid_t otherpid = -1;
493
494 if (_pidfile.empty())
495 return;
496 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
497 if (pfh == NULL) {
498 if (errno == EEXIST)
499 errx(1, "devd already running, pid: %d", (int)otherpid);
500 warn("cannot open pid file");
501 }
502 }
503
504 void
write_pidfile()505 config::write_pidfile()
506 {
507
508 pidfile_write(pfh);
509 }
510
511 void
close_pidfile()512 config::close_pidfile()
513 {
514
515 pidfile_close(pfh);
516 }
517
518 void
remove_pidfile()519 config::remove_pidfile()
520 {
521
522 pidfile_remove(pfh);
523 }
524
525 void
add_attach(int prio,event_proc * p)526 config::add_attach(int prio, event_proc *p)
527 {
528 p->set_priority(prio);
529 _attach_list.push_back(p);
530 }
531
532 void
add_detach(int prio,event_proc * p)533 config::add_detach(int prio, event_proc *p)
534 {
535 p->set_priority(prio);
536 _detach_list.push_back(p);
537 }
538
539 void
add_directory(const char * dir)540 config::add_directory(const char *dir)
541 {
542 _dir_list.push_back(string(dir));
543 }
544
545 void
add_nomatch(int prio,event_proc * p)546 config::add_nomatch(int prio, event_proc *p)
547 {
548 p->set_priority(prio);
549 _nomatch_list.push_back(p);
550 }
551
552 void
add_notify(int prio,event_proc * p)553 config::add_notify(int prio, event_proc *p)
554 {
555 p->set_priority(prio);
556 _notify_list.push_back(p);
557 }
558
559 void
set_pidfile(const char * fn)560 config::set_pidfile(const char *fn)
561 {
562 _pidfile = fn;
563 }
564
565 void
push_var_table()566 config::push_var_table()
567 {
568 var_list *vl;
569
570 vl = new var_list();
571 _var_list_table.push_back(vl);
572 devdlog(LOG_DEBUG, "Pushing table\n");
573 }
574
575 void
pop_var_table()576 config::pop_var_table()
577 {
578 delete _var_list_table.back();
579 _var_list_table.pop_back();
580 devdlog(LOG_DEBUG, "Popping table\n");
581 }
582
583 void
set_variable(const char * var,const char * val)584 config::set_variable(const char *var, const char *val)
585 {
586 _var_list_table.back()->set_variable(var, val);
587 }
588
589 const string &
get_variable(const string & var)590 config::get_variable(const string &var)
591 {
592 vector<var_list *>::reverse_iterator i;
593
594 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) {
595 if ((*i)->is_set(var))
596 return ((*i)->get_variable(var));
597 }
598 return (var_list::nothing);
599 }
600
601 bool
is_id_char(char ch) const602 config::is_id_char(char ch) const
603 {
604 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
605 ch == '-'));
606 }
607
608 void
expand_one(const char * & src,string & dst)609 config::expand_one(const char *&src, string &dst)
610 {
611 int count;
612 string buffer;
613
614 src++;
615 // $$ -> $
616 if (*src == '$') {
617 dst += *src++;
618 return;
619 }
620
621 // $(foo) -> $(foo)
622 // Not sure if I want to support this or not, so for now we just pass
623 // it through.
624 if (*src == '(') {
625 dst += '$';
626 count = 1;
627 /* If the string ends before ) is matched , return. */
628 while (count > 0 && *src) {
629 if (*src == ')')
630 count--;
631 else if (*src == '(')
632 count++;
633 dst += *src++;
634 }
635 return;
636 }
637
638 // $[^A-Za-z] -> $\1
639 if (!isalpha(*src)) {
640 dst += '$';
641 dst += *src++;
642 return;
643 }
644
645 // $var -> replace with value
646 do {
647 buffer += *src++;
648 } while (is_id_char(*src));
649 dst.append(get_variable(buffer));
650 }
651
652 const string
expand_string(const char * src,const char * prepend,const char * append)653 config::expand_string(const char *src, const char *prepend, const char *append)
654 {
655 const char *var_at;
656 string dst;
657
658 /*
659 * 128 bytes is enough for 2427 of 2438 expansions that happen
660 * while parsing config files, as tested on 2013-01-30.
661 */
662 dst.reserve(128);
663
664 if (prepend != NULL)
665 dst = prepend;
666
667 for (;;) {
668 var_at = strchr(src, '$');
669 if (var_at == NULL) {
670 dst.append(src);
671 break;
672 }
673 dst.append(src, var_at - src);
674 src = var_at;
675 expand_one(src, dst);
676 }
677
678 if (append != NULL)
679 dst.append(append);
680
681 return (dst);
682 }
683
684 bool
chop_var(char * & buffer,char * & lhs,char * & rhs) const685 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const
686 {
687 char *walker;
688
689 if (*buffer == '\0')
690 return (false);
691 walker = lhs = buffer;
692 while (is_id_char(*walker))
693 walker++;
694 if (*walker != '=')
695 return (false);
696 walker++; // skip =
697 if (*walker == '"') {
698 walker++; // skip "
699 rhs = walker;
700 while (*walker && *walker != '"')
701 walker++;
702 if (*walker != '"')
703 return (false);
704 rhs[-2] = '\0';
705 *walker++ = '\0';
706 } else {
707 rhs = walker;
708 while (*walker && !isspace(*walker))
709 walker++;
710 if (*walker != '\0')
711 *walker++ = '\0';
712 rhs[-1] = '\0';
713 }
714 while (isspace(*walker))
715 walker++;
716 buffer = walker;
717 return (true);
718 }
719
720
721 char *
set_vars(char * buffer)722 config::set_vars(char *buffer)
723 {
724 char *lhs;
725 char *rhs;
726
727 while (1) {
728 if (!chop_var(buffer, lhs, rhs))
729 break;
730 set_variable(lhs, rhs);
731 }
732 return (buffer);
733 }
734
735 void
find_and_execute(char type)736 config::find_and_execute(char type)
737 {
738 vector<event_proc *> *l;
739 vector<event_proc *>::const_iterator i;
740 const char *s;
741
742 switch (type) {
743 default:
744 return;
745 case notify:
746 l = &_notify_list;
747 s = "notify";
748 break;
749 case nomatch:
750 l = &_nomatch_list;
751 s = "nomatch";
752 break;
753 case attach:
754 l = &_attach_list;
755 s = "attach";
756 break;
757 case detach:
758 l = &_detach_list;
759 s = "detach";
760 break;
761 }
762 devdlog(LOG_DEBUG, "Processing %s event\n", s);
763 for (i = l->begin(); i != l->end(); ++i) {
764 if ((*i)->matches(*this)) {
765 (*i)->run(*this);
766 break;
767 }
768 }
769
770 }
771
772
773 static void
process_event(char * buffer)774 process_event(char *buffer)
775 {
776 char type;
777 char *sp;
778
779 sp = buffer + 1;
780 devdlog(LOG_INFO, "Processing event '%s'\n", buffer);
781 type = *buffer++;
782 cfg.push_var_table();
783 // No match doesn't have a device, and the format is a little
784 // different, so handle it separately.
785 switch (type) {
786 case notify:
787 sp = cfg.set_vars(sp);
788 break;
789 case nomatch:
790 //? at location pnp-info on bus
791 sp = strchr(sp, ' ');
792 if (sp == NULL)
793 return; /* Can't happen? */
794 *sp++ = '\0';
795 while (isspace(*sp))
796 sp++;
797 if (strncmp(sp, "at ", 3) == 0)
798 sp += 3;
799 sp = cfg.set_vars(sp);
800 while (isspace(*sp))
801 sp++;
802 if (strncmp(sp, "on ", 3) == 0)
803 cfg.set_variable("bus", sp + 3);
804 break;
805 case attach: /*FALLTHROUGH*/
806 case detach:
807 sp = strchr(sp, ' ');
808 if (sp == NULL)
809 return; /* Can't happen? */
810 *sp++ = '\0';
811 cfg.set_variable("device-name", buffer);
812 while (isspace(*sp))
813 sp++;
814 if (strncmp(sp, "at ", 3) == 0)
815 sp += 3;
816 sp = cfg.set_vars(sp);
817 while (isspace(*sp))
818 sp++;
819 if (strncmp(sp, "on ", 3) == 0)
820 cfg.set_variable("bus", sp + 3);
821 break;
822 }
823
824 cfg.find_and_execute(type);
825 cfg.pop_var_table();
826 }
827
828 int
create_socket(const char * name,int socktype)829 create_socket(const char *name, int socktype)
830 {
831 int fd, slen;
832 struct sockaddr_un sun;
833
834 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0)
835 err(1, "socket");
836 bzero(&sun, sizeof(sun));
837 sun.sun_family = AF_UNIX;
838 strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
839 slen = SUN_LEN(&sun);
840 unlink(name);
841 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
842 err(1, "fcntl");
843 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0)
844 err(1, "bind");
845 listen(fd, 4);
846 chown(name, 0, 0); /* XXX - root.wheel */
847 chmod(name, 0666);
848 return (fd);
849 }
850
851 unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */
852 unsigned int num_clients;
853
854 list<client_t> clients;
855
856 void
notify_clients(const char * data,int len)857 notify_clients(const char *data, int len)
858 {
859 list<client_t>::iterator i;
860
861 /*
862 * Deliver the data to all clients. Throw clients overboard at the
863 * first sign of trouble. This reaps clients who've died or closed
864 * their sockets, and also clients who are alive but failing to keep up
865 * (or who are maliciously not reading, to consume buffer space in
866 * kernel memory or tie up the limited number of available connections).
867 */
868 for (i = clients.begin(); i != clients.end(); ) {
869 int flags;
870 if (i->socktype == SOCK_SEQPACKET)
871 flags = MSG_EOR;
872 else
873 flags = 0;
874
875 if (send(i->fd, data, len, flags) != len) {
876 --num_clients;
877 close(i->fd);
878 i = clients.erase(i);
879 devdlog(LOG_WARNING, "notify_clients: send() failed; "
880 "dropping unresponsive client\n");
881 } else
882 ++i;
883 }
884 }
885
886 void
check_clients(void)887 check_clients(void)
888 {
889 int s;
890 struct pollfd pfd;
891 list<client_t>::iterator i;
892
893 /*
894 * Check all existing clients to see if any of them have disappeared.
895 * Normally we reap clients when we get an error trying to send them an
896 * event. This check eliminates the problem of an ever-growing list of
897 * zombie clients because we're never writing to them on a system
898 * without frequent device-change activity.
899 */
900 pfd.events = 0;
901 for (i = clients.begin(); i != clients.end(); ) {
902 pfd.fd = i->fd;
903 s = poll(&pfd, 1, 0);
904 if ((s < 0 && s != EINTR ) ||
905 (s > 0 && (pfd.revents & POLLHUP))) {
906 --num_clients;
907 close(i->fd);
908 i = clients.erase(i);
909 devdlog(LOG_NOTICE, "check_clients: "
910 "dropping disconnected client\n");
911 } else
912 ++i;
913 }
914 }
915
916 void
new_client(int fd,int socktype)917 new_client(int fd, int socktype)
918 {
919 client_t s;
920 int sndbuf_size;
921
922 /*
923 * First go reap any zombie clients, then accept the connection, and
924 * shut down the read side to stop clients from consuming kernel memory
925 * by sending large buffers full of data we'll never read.
926 */
927 check_clients();
928 s.socktype = socktype;
929 s.fd = accept(fd, NULL, NULL);
930 if (s.fd != -1) {
931 sndbuf_size = CLIENT_BUFSIZE;
932 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size,
933 sizeof(sndbuf_size)))
934 err(1, "setsockopt");
935 shutdown(s.fd, SHUT_RD);
936 clients.push_back(s);
937 ++num_clients;
938 } else
939 err(1, "accept");
940 }
941
942 static void
event_loop(void)943 event_loop(void)
944 {
945 int rv;
946 int fd;
947 char buffer[DEVCTL_MAXBUF];
948 int once = 0;
949 int stream_fd, seqpacket_fd, max_fd;
950 int accepting;
951 timeval tv;
952 fd_set fds;
953
954 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC);
955 if (fd == -1)
956 err(1, "Can't open devctl device %s", PATH_DEVCTL);
957 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM);
958 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET);
959 accepting = 1;
960 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1;
961 while (!romeo_must_die) {
962 if (!once && !no_daemon && !daemonize_quick) {
963 // Check to see if we have any events pending.
964 tv.tv_sec = 0;
965 tv.tv_usec = 0;
966 FD_ZERO(&fds);
967 FD_SET(fd, &fds);
968 rv = select(fd + 1, &fds, NULL, NULL, &tv);
969 // No events -> we've processed all pending events
970 if (rv == 0) {
971 devdlog(LOG_DEBUG, "Calling daemon\n");
972 cfg.remove_pidfile();
973 cfg.open_pidfile();
974 daemon(0, 0);
975 cfg.write_pidfile();
976 once++;
977 }
978 }
979 /*
980 * When we've already got the max number of clients, stop
981 * accepting new connections (don't put the listening sockets in
982 * the set), shrink the accept() queue to reject connections
983 * quickly, and poll the existing clients more often, so that we
984 * notice more quickly when any of them disappear to free up
985 * client slots.
986 */
987 FD_ZERO(&fds);
988 FD_SET(fd, &fds);
989 if (num_clients < max_clients) {
990 if (!accepting) {
991 listen(stream_fd, max_clients);
992 listen(seqpacket_fd, max_clients);
993 accepting = 1;
994 }
995 FD_SET(stream_fd, &fds);
996 FD_SET(seqpacket_fd, &fds);
997 tv.tv_sec = 60;
998 tv.tv_usec = 0;
999 } else {
1000 if (accepting) {
1001 listen(stream_fd, 0);
1002 listen(seqpacket_fd, 0);
1003 accepting = 0;
1004 }
1005 tv.tv_sec = 2;
1006 tv.tv_usec = 0;
1007 }
1008 rv = select(max_fd, &fds, NULL, NULL, &tv);
1009 if (got_siginfo) {
1010 devdlog(LOG_NOTICE, "Events received so far=%u\n",
1011 total_events);
1012 got_siginfo = 0;
1013 }
1014 if (rv == -1) {
1015 if (errno == EINTR)
1016 continue;
1017 err(1, "select");
1018 } else if (rv == 0)
1019 check_clients();
1020 if (FD_ISSET(fd, &fds)) {
1021 rv = read(fd, buffer, sizeof(buffer) - 1);
1022 if (rv > 0) {
1023 total_events++;
1024 if (rv == sizeof(buffer) - 1) {
1025 devdlog(LOG_WARNING, "Warning: "
1026 "available event data exceeded "
1027 "buffer space\n");
1028 }
1029 notify_clients(buffer, rv);
1030 buffer[rv] = '\0';
1031 while (buffer[--rv] == '\n')
1032 buffer[rv] = '\0';
1033 process_event(buffer);
1034 } else if (rv < 0) {
1035 if (errno != EINTR)
1036 break;
1037 } else {
1038 /* EOF */
1039 break;
1040 }
1041 }
1042 if (FD_ISSET(stream_fd, &fds))
1043 new_client(stream_fd, SOCK_STREAM);
1044 /*
1045 * Aside from the socket type, both sockets use the same
1046 * protocol, so we can process clients the same way.
1047 */
1048 if (FD_ISSET(seqpacket_fd, &fds))
1049 new_client(seqpacket_fd, SOCK_SEQPACKET);
1050 }
1051 close(fd);
1052 }
1053
1054 /*
1055 * functions that the parser uses.
1056 */
1057 void
add_attach(int prio,event_proc * p)1058 add_attach(int prio, event_proc *p)
1059 {
1060 cfg.add_attach(prio, p);
1061 }
1062
1063 void
add_detach(int prio,event_proc * p)1064 add_detach(int prio, event_proc *p)
1065 {
1066 cfg.add_detach(prio, p);
1067 }
1068
1069 void
add_directory(const char * dir)1070 add_directory(const char *dir)
1071 {
1072 cfg.add_directory(dir);
1073 free(const_cast<char *>(dir));
1074 }
1075
1076 void
add_nomatch(int prio,event_proc * p)1077 add_nomatch(int prio, event_proc *p)
1078 {
1079 cfg.add_nomatch(prio, p);
1080 }
1081
1082 void
add_notify(int prio,event_proc * p)1083 add_notify(int prio, event_proc *p)
1084 {
1085 cfg.add_notify(prio, p);
1086 }
1087
1088 event_proc *
add_to_event_proc(event_proc * ep,eps * eps)1089 add_to_event_proc(event_proc *ep, eps *eps)
1090 {
1091 if (ep == NULL)
1092 ep = new event_proc();
1093 ep->add(eps);
1094 return (ep);
1095 }
1096
1097 eps *
new_action(const char * cmd)1098 new_action(const char *cmd)
1099 {
1100 eps *e = new action(cmd);
1101 free(const_cast<char *>(cmd));
1102 return (e);
1103 }
1104
1105 eps *
new_match(const char * var,const char * re)1106 new_match(const char *var, const char *re)
1107 {
1108 eps *e = new match(cfg, var, re);
1109 free(const_cast<char *>(var));
1110 free(const_cast<char *>(re));
1111 return (e);
1112 }
1113
1114 eps *
new_media(const char * var,const char * re)1115 new_media(const char *var, const char *re)
1116 {
1117 eps *e = new media(cfg, var, re);
1118 free(const_cast<char *>(var));
1119 free(const_cast<char *>(re));
1120 return (e);
1121 }
1122
1123 void
set_pidfile(const char * name)1124 set_pidfile(const char *name)
1125 {
1126 cfg.set_pidfile(name);
1127 free(const_cast<char *>(name));
1128 }
1129
1130 void
set_variable(const char * var,const char * val)1131 set_variable(const char *var, const char *val)
1132 {
1133 cfg.set_variable(var, val);
1134 free(const_cast<char *>(var));
1135 free(const_cast<char *>(val));
1136 }
1137
1138
1139
1140 static void
gensighand(int)1141 gensighand(int)
1142 {
1143 romeo_must_die = 1;
1144 }
1145
1146 /*
1147 * SIGINFO handler. Will print useful statistics to the syslog or stderr
1148 * as appropriate
1149 */
1150 static void
siginfohand(int)1151 siginfohand(int)
1152 {
1153 got_siginfo = 1;
1154 }
1155
1156 /*
1157 * Local logging function. Prints to syslog if we're daemonized; stderr
1158 * otherwise.
1159 */
1160 static void
devdlog(int priority,const char * fmt,...)1161 devdlog(int priority, const char* fmt, ...)
1162 {
1163 va_list argp;
1164
1165 va_start(argp, fmt);
1166 if (no_daemon)
1167 vfprintf(stderr, fmt, argp);
1168 else if ((! quiet_mode) || (priority <= LOG_WARNING))
1169 vsyslog(priority, fmt, argp);
1170 va_end(argp);
1171 }
1172
1173 static void
usage()1174 usage()
1175 {
1176 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n",
1177 getprogname());
1178 exit(1);
1179 }
1180
1181 static void
check_devd_enabled()1182 check_devd_enabled()
1183 {
1184 int val = 0;
1185 size_t len;
1186
1187 len = sizeof(val);
1188 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
1189 errx(1, "devctl sysctl missing from kernel!");
1190 if (val) {
1191 warnx("Setting " SYSCTL " to 0");
1192 val = 0;
1193 sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
1194 }
1195 }
1196
1197 /*
1198 * main
1199 */
1200 int
main(int argc,char ** argv)1201 main(int argc, char **argv)
1202 {
1203 int ch;
1204
1205 check_devd_enabled();
1206 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) {
1207 switch (ch) {
1208 case 'd':
1209 no_daemon = 1;
1210 break;
1211 case 'f':
1212 configfile = optarg;
1213 break;
1214 case 'l':
1215 max_clients = MAX(1, strtoul(optarg, NULL, 0));
1216 break;
1217 case 'n':
1218 daemonize_quick = 1;
1219 break;
1220 case 'q':
1221 quiet_mode = 1;
1222 break;
1223 default:
1224 usage();
1225 }
1226 }
1227
1228 cfg.parse();
1229 if (!no_daemon && daemonize_quick) {
1230 cfg.open_pidfile();
1231 daemon(0, 0);
1232 cfg.write_pidfile();
1233 }
1234 signal(SIGPIPE, SIG_IGN);
1235 signal(SIGHUP, gensighand);
1236 signal(SIGINT, gensighand);
1237 signal(SIGTERM, gensighand);
1238 signal(SIGINFO, siginfohand);
1239 event_loop();
1240 return (0);
1241 }
1242