xref: /dflybsd-src/sbin/devd/devd.cc (revision 381fa6da48f61b44a92fbaf73b2f65e40c705e14) 
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  * $FreeBSD: src/sbin/devd/devd.cc,v 1.33 2006/09/17 22:49:26 ru Exp $
27 
28  */
29 
30 /*
31  * DEVD control daemon.
32  */
33 
34 // TODO list:
35 //	o devd.conf and devd man pages need a lot of help:
36 //	  - devd needs to document the unix domain socket
37 //	  - devd.conf needs more details on the supported statements.
38 
39 #include <sys/param.h>
40 #include <sys/socket.h>
41 #include <sys/stat.h>
42 #include <sys/sysctl.h>
43 #include <sys/types.h>
44 #include <sys/un.h>
45 
46 #include <cctype>
47 #include <cerrno>
48 #include <csignal>
49 #include <cstdlib>
50 #include <cstdio>
51 #include <cstring>
52 
53 #include <dirent.h>
54 #include <err.h>
55 #include <fcntl.h>
56 #include <libutil.h>
57 #include <regex.h>
58 #include <unistd.h>
59 
60 #include <algorithm>
61 #include <map>
62 #include <string>
63 #include <list>
64 #include <vector>
65 
66 #include "devd.h"		/* C compatible definitions */
67 #include "devd.hh"		/* C++ class definitions */
68 
69 #define PIPE "/var/run/devd.pipe"
70 #define CF "/etc/devd.conf"
71 #define SYSCTL "hw.bus.devctl_disable"
72 
73 using namespace std;
74 
75 extern FILE *yyin;
76 extern int lineno;
77 
78 static const char notify = '!';
79 static const char nomatch = '?';
80 static const char attach = '+';
81 static const char detach = '-';
82 
83 static struct pidfh *pfh;
84 int Dflag;
85 int dflag;
86 int nflag;
87 static volatile sig_atomic_t romeo_must_die = 0;
88 
89 static const char *configfile = CF;
90 
91 static void event_loop(void);
92 static void usage(void);
93 
94 template <class T> void
95 delete_and_clear(vector<T *> &v)
96 {
97 	typename vector<T *>::const_iterator i;
98 
99 	for (i = v.begin(); i != v.end(); ++i)
100 		delete *i;
101 	v.clear();
102 }
103 
104 config cfg;
105 
106 event_proc::event_proc() : _prio(-1)
107 {
108 	// nothing
109 }
110 
111 event_proc::~event_proc()
112 {
113 	delete_and_clear(_epsvec);
114 }
115 
116 void
117 event_proc::add(eps *eps)
118 {
119 	_epsvec.push_back(eps);
120 }
121 
122 bool
123 event_proc::matches(config &c) const
124 {
125 	vector<eps *>::const_iterator i;
126 
127 	for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
128 		if (!(*i)->do_match(c))
129 			return (false);
130 	return (true);
131 }
132 
133 bool
134 event_proc::run(config &c) const
135 {
136 	vector<eps *>::const_iterator i;
137 
138 	for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
139 		if (!(*i)->do_action(c))
140 			return (false);
141 	return (true);
142 }
143 
144 action::action(const char *cmd)
145 	: _cmd(cmd)
146 {
147 	// nothing
148 }
149 
150 action::~action()
151 {
152 	// nothing
153 }
154 
155 bool
156 action::do_action(config &c)
157 {
158 	string s = c.expand_string(_cmd.c_str());
159 	if (Dflag)
160 		fprintf(stderr, "Executing '%s'\n", s.c_str());
161 	::system(s.c_str());
162 	return (true);
163 }
164 
165 match::match(config &c, const char *var, const char *re) :
166 	_inv(re[0] == '!'),
167 	_var(var),
168 	_re(c.expand_string(_inv ? re + 1 : re, "^", "$"))
169 {
170 	regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
171 }
172 
173 match::~match()
174 {
175 	regfree(&_regex);
176 }
177 
178 bool
179 match::do_match(config &c)
180 {
181 	const string &value = c.get_variable(_var);
182 	bool retval;
183 
184 	/*
185 	 * This function gets called WAY too often to justify calling syslog()
186 	 * each time, even at LOG_DEBUG.  Because if syslogd isn't running, it
187 	 * can consume excessive amounts of systime inside of connect().  Only
188 	 * log when we're in -d mode.
189 	 */
190 	if (Dflag)
191 		fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
192 		    value.c_str(), _re.c_str());
193 
194 	retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
195 	if (_inv == 1)
196 		retval = (retval == 0) ? 1 : 0;
197 
198 	return (retval);
199 }
200 
201 #include <sys/sockio.h>
202 #include <net/if.h>
203 #include <net/if_media.h>
204 
205 media::media(config &, const char *var, const char *type)
206 	: _var(var), _type(-1)
207 {
208 	static struct ifmedia_description media_types[] = {
209 		{ IFM_ETHER,		"Ethernet" },
210 		{ IFM_IEEE80211,	"802.11" },
211 		{ IFM_ATM,		"ATM" },
212 		{ IFM_CARP,		"CARP" },
213 		{ -1,			"unknown" },
214 		{ 0, NULL },
215 	};
216 	for (int i = 0; media_types[i].ifmt_string != NULL; ++i)
217 		if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
218 			_type = media_types[i].ifmt_word;
219 			break;
220 		}
221 }
222 
223 media::~media()
224 {
225 }
226 
227 bool
228 media::do_match(config &c)
229 {
230 	string value;
231 	struct ifmediareq ifmr;
232 	bool retval;
233 	int s;
234 
235 	// Since we can be called from both a device attach/detach
236 	// context where device-name is defined and what we want,
237 	// as well as from a link status context, where subsystem is
238 	// the name of interest, first try device-name and fall back
239 	// to subsystem if none exists.
240 	value = c.get_variable("device-name");
241 	if (value.empty())
242 		value = c.get_variable("subsystem");
243 	if (Dflag)
244 		fprintf(stderr, "Testing media type of %s against 0x%x\n",
245 		    value.c_str(), _type);
246 
247 	retval = false;
248 
249 	s = socket(PF_INET, SOCK_DGRAM, 0);
250 	if (s >= 0) {
251 		memset(&ifmr, 0, sizeof(ifmr));
252 		strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
253 
254 		if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
255 		    ifmr.ifm_status & IFM_AVALID) {
256 			if (Dflag)
257 				fprintf(stderr, "%s has media type 0x%x\n",
258 				    value.c_str(), IFM_TYPE(ifmr.ifm_active));
259 			retval = (IFM_TYPE(ifmr.ifm_active) == _type);
260 		} else if (_type == -1) {
261 			if (Dflag)
262 				fprintf(stderr, "%s has unknown media type\n",
263 				    value.c_str());
264 			retval = true;
265 		}
266 		close(s);
267 	}
268 
269 	return (retval);
270 }
271 
272 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
273 const string var_list::nothing = "";
274 
275 const string &
276 var_list::get_variable(const string &var) const
277 {
278 	map<string, string>::const_iterator i;
279 
280 	i = _vars.find(var);
281 	if (i == _vars.end())
282 		return (var_list::bogus);
283 	return (i->second);
284 }
285 
286 bool
287 var_list::is_set(const string &var) const
288 {
289 	return (_vars.find(var) != _vars.end());
290 }
291 
292 void
293 var_list::set_variable(const string &var, const string &val)
294 {
295 	/*
296 	 * This function gets called WAY too often to justify calling syslog()
297 	 * each time, even at LOG_DEBUG.  Because if syslogd isn't running, it
298 	 * can consume excessive amounts of systime inside of connect().  Only
299 	 * log when we're in -d mode.
300 	 */
301 	if (Dflag)
302 		fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
303 	_vars[var] = val;
304 }
305 
306 void
307 config::reset(void)
308 {
309 	_dir_list.clear();
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);
315 }
316 
317 void
318 config::parse_one_file(const char *fn)
319 {
320 	if (Dflag)
321 		fprintf(stderr, "Parsing %s\n", fn);
322 	yyin = fopen(fn, "r");
323 	if (yyin == NULL)
324 		err(1, "Cannot open config file %s", fn);
325 	lineno = 1;
326 	if (yyparse() != 0)
327 		errx(1, "Cannot parse %s at line %d", fn, lineno);
328 	fclose(yyin);
329 }
330 
331 void
332 config::parse_files_in_dir(const char *dirname)
333 {
334 	DIR *dirp;
335 	struct dirent *dp;
336 	char path[PATH_MAX];
337 
338 	if (Dflag)
339 		fprintf(stderr, "Parsing files in %s\n", dirname);
340 	dirp = opendir(dirname);
341 	if (dirp == NULL)
342 		return;
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);
350 		}
351 	}
352 	closedir(dirp);
353 }
354 
355 class epv_greater {
356 public:
357 	int operator()(event_proc *const&l1, event_proc *const&l2) const
358 	{
359 		return (l1->get_priority() > l2->get_priority());
360 	}
361 };
362 
363 void
364 config::sort_vector(vector<event_proc *> &v)
365 {
366 	sort(v.begin(), v.end(), epv_greater());
367 }
368 
369 void
370 config::parse(void)
371 {
372 	vector<string>::const_iterator i;
373 
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);
381 }
382 
383 void
384 config::open_pidfile()
385 {
386 	pid_t otherpid;
387 
388 	if (_pidfile.empty())
389 		return;
390 	pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
391 	if (pfh == NULL) {
392 		if (errno == EEXIST)
393 			errx(1, "devd already running, pid: %d", (int)otherpid);
394 		warn("cannot open pid file");
395 	}
396 }
397 
398 void
399 config::write_pidfile()
400 {
401 
402 	pidfile_write(pfh);
403 }
404 
405 void
406 config::close_pidfile()
407 {
408 
409 	pidfile_close(pfh);
410 }
411 
412 void
413 config::remove_pidfile()
414 {
415 
416 	pidfile_remove(pfh);
417 }
418 
419 void
420 config::add_attach(int prio, event_proc *p)
421 {
422 	p->set_priority(prio);
423 	_attach_list.push_back(p);
424 }
425 
426 void
427 config::add_detach(int prio, event_proc *p)
428 {
429 	p->set_priority(prio);
430 	_detach_list.push_back(p);
431 }
432 
433 void
434 config::add_directory(const char *dir)
435 {
436 	_dir_list.push_back(string(dir));
437 }
438 
439 void
440 config::add_nomatch(int prio, event_proc *p)
441 {
442 	p->set_priority(prio);
443 	_nomatch_list.push_back(p);
444 }
445 
446 void
447 config::add_notify(int prio, event_proc *p)
448 {
449 	p->set_priority(prio);
450 	_notify_list.push_back(p);
451 }
452 
453 void
454 config::set_pidfile(const char *fn)
455 {
456 	_pidfile = fn;
457 }
458 
459 void
460 config::push_var_table()
461 {
462 	var_list *vl;
463 
464 	vl = new var_list();
465 	_var_list_table.push_back(vl);
466 	if (Dflag)
467 		fprintf(stderr, "Pushing table\n");
468 }
469 
470 void
471 config::pop_var_table()
472 {
473 	delete _var_list_table.back();
474 	_var_list_table.pop_back();
475 	if (Dflag)
476 		fprintf(stderr, "Popping table\n");
477 }
478 
479 void
480 config::set_variable(const char *var, const char *val)
481 {
482 	_var_list_table.back()->set_variable(var, val);
483 }
484 
485 const string &
486 config::get_variable(const string &var)
487 {
488 	vector<var_list *>::reverse_iterator i;
489 
490 	for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) {
491 		if ((*i)->is_set(var))
492 			return ((*i)->get_variable(var));
493 	}
494 	return (var_list::nothing);
495 }
496 
497 bool
498 config::is_id_char(char ch) const
499 {
500 	return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
501 	    ch == '-'));
502 }
503 
504 void
505 config::expand_one(const char *&src, string &dst)
506 {
507 	int count;
508 	string buffer;
509 
510 	src++;
511 	// $$ -> $
512 	if (*src == '$') {
513 		dst += *src++;
514 		return;
515 	}
516 
517 	// $(foo) -> $(foo)
518 	// Not sure if I want to support this or not, so for now we just pass
519 	// it through.
520 	if (*src == '(') {
521 		dst += '$';
522 		count = 1;
523 		/* If the string ends before ) is matched , return. */
524 		while (count > 0 && *src) {
525 			if (*src == ')')
526 				count--;
527 			else if (*src == '(')
528 				count++;
529 			dst += *src++;
530 		}
531 		return;
532 	}
533 
534 	// $[^A-Za-z] -> $\1
535 	if (!isalpha(*src)) {
536 		dst += '$';
537 		dst += *src++;
538 		return;
539 	}
540 
541 	// $var -> replace with value
542 	do {
543 		buffer += *src++;
544 	} while (is_id_char(*src));
545 	dst.append(get_variable(buffer));
546 }
547 
548 const string
549 config::expand_string(const char *src, const char *prepend, const char *append)
550 {
551 	const char *var_at;
552 	string dst;
553 
554 	/*
555 	 * 128 bytes is enough for 2427 of 2438 expansions that happen
556 	 * while parsing config files, as tested on 2013-01-30.
557 	 */
558 	dst.reserve(128);
559 
560 	if (prepend != NULL)
561 		dst = prepend;
562 
563 	for (;;) {
564 		var_at = strchr(src, '$');
565 		if (var_at == NULL) {
566 			dst.append(src);
567 			break;
568 		}
569 		dst.append(src, var_at - src);
570 		src = var_at;
571 			expand_one(src, dst);
572 	}
573 
574 	if (append != NULL)
575 		dst.append(append);
576 
577 	return (dst);
578 }
579 
580 bool
581 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const
582 {
583 	char *walker;
584 
585 	if (*buffer == '\0')
586 		return (false);
587 	walker = lhs = buffer;
588 	while (is_id_char(*walker))
589 		walker++;
590 	if (*walker != '=')
591 		return (false);
592 	walker++;		// skip =
593 	if (*walker == '"') {
594 		walker++;	// skip "
595 		rhs = walker;
596 		while (*walker && *walker != '"')
597 			walker++;
598 		if (*walker != '"')
599 			return (false);
600 		rhs[-2] = '\0';
601 		*walker++ = '\0';
602 	} else {
603 		rhs = walker;
604 		while (*walker && !isspace(*walker))
605 			walker++;
606 		if (*walker != '\0')
607 			*walker++ = '\0';
608 		rhs[-1] = '\0';
609 	}
610 	while (isspace(*walker))
611 		walker++;
612 	buffer = walker;
613 	return (true);
614 }
615 
616 
617 char *
618 config::set_vars(char *buffer)
619 {
620 	char *lhs;
621 	char *rhs;
622 
623 	while (1) {
624 		if (!chop_var(buffer, lhs, rhs))
625 			break;
626 		set_variable(lhs, rhs);
627 	}
628 	return (buffer);
629 }
630 
631 void
632 config::find_and_execute(char type)
633 {
634 	vector<event_proc *> *l;
635 	vector<event_proc *>::const_iterator i;
636 	const char *s;
637 
638 	switch (type) {
639 	default:
640 		return;
641 	case notify:
642 		l = &_notify_list;
643 		s = "notify";
644 		break;
645 	case nomatch:
646 		l = &_nomatch_list;
647 		s = "nomatch";
648 		break;
649 	case attach:
650 		l = &_attach_list;
651 		s = "attach";
652 		break;
653 	case detach:
654 		l = &_detach_list;
655 		s = "detach";
656 		break;
657 	}
658 	if (Dflag)
659 		fprintf(stderr, "Processing %s event\n", s);
660 	for (i = l->begin(); i != l->end(); ++i) {
661 		if ((*i)->matches(*this)) {
662 			(*i)->run(*this);
663 			break;
664 		}
665 	}
666 
667 }
668 
669 
670 static void
671 process_event(char *buffer)
672 {
673 	char type;
674 	char *sp;
675 
676 	sp = buffer + 1;
677 	if (Dflag)
678 		fprintf(stderr, "Processing event '%s'\n", buffer);
679 	type = *buffer++;
680 	cfg.push_var_table();
681 	// No match doesn't have a device, and the format is a little
682 	// different, so handle it separately.
683 	switch (type) {
684 	case notify:
685 		sp = cfg.set_vars(sp);
686 		break;
687 	case nomatch:
688 		//? at location pnp-info on bus
689 		sp = strchr(sp, ' ');
690 		if (sp == NULL)
691 			return;	/* Can't happen? */
692 		*sp++ = '\0';
693 		while (isspace(*sp))
694 			sp++;
695 		if (strncmp(sp, "at ", 3) == 0)
696 			sp += 3;
697 		sp = cfg.set_vars(sp);
698 		while (isspace(*sp))
699 			sp++;
700 		if (strncmp(sp, "on ", 3) == 0)
701 			cfg.set_variable("bus", sp + 3);
702 		break;
703 	case attach:	/*FALLTHROUGH*/
704 	case detach:
705 		sp = strchr(sp, ' ');
706 		if (sp == NULL)
707 			return;	/* Can't happen? */
708 		*sp++ = '\0';
709 		cfg.set_variable("device-name", buffer);
710 		while (isspace(*sp))
711 			sp++;
712 		if (strncmp(sp, "at ", 3) == 0)
713 			sp += 3;
714 		sp = cfg.set_vars(sp);
715 		while (isspace(*sp))
716 			sp++;
717 		if (strncmp(sp, "on ", 3) == 0)
718 			cfg.set_variable("bus", sp + 3);
719 		break;
720 	}
721 
722 	cfg.find_and_execute(type);
723 	cfg.pop_var_table();
724 }
725 
726 int
727 create_socket(const char *name)
728 {
729 	int fd, slen;
730 	struct sockaddr_un sun;
731 
732 	if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
733 		err(1, "socket");
734 	bzero(&sun, sizeof(sun));
735 	sun.sun_family = AF_UNIX;
736 	strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
737 	slen = SUN_LEN(&sun);
738 	unlink(name);
739 	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
740 	    	err(1, "fcntl");
741 	if (::bind(fd, (struct sockaddr *) & sun, slen) < 0)
742 		err(1, "bind");
743 	listen(fd, 4);
744 	chown(name, 0, 0);	/* XXX - root.wheel */
745 	chmod(name, 0666);
746 	return (fd);
747 }
748 
749 list<int> clients;
750 
751 void
752 notify_clients(const char *data, int len)
753 {
754 	list<int> bad;
755 	list<int>::const_iterator i;
756 
757 	for (i = clients.begin(); i != clients.end(); ++i) {
758 		if (write(*i, data, len) <= 0) {
759 			bad.push_back(*i);
760 			close(*i);
761 		}
762 	}
763 
764 	for (i = bad.begin(); i != bad.end(); ++i)
765 		clients.erase(find(clients.begin(), clients.end(), *i));
766 }
767 
768 void
769 new_client(int fd)
770 {
771 	int s;
772 
773 	s = accept(fd, NULL, NULL);
774 	if (s != -1)
775 		clients.push_back(s);
776 }
777 
778 static void
779 event_loop(void)
780 {
781 	int rv;
782 	int fd;
783 	char buffer[DEVCTL_MAXBUF];
784 	int once = 0;
785 	int server_fd, max_fd;
786 	timeval tv;
787 	fd_set fds;
788 
789 	fd = open(PATH_DEVCTL, O_RDONLY);
790 	if (fd == -1)
791 		err(1, "Can't open devctl device %s", PATH_DEVCTL);
792 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
793 		err(1, "Can't set close-on-exec flag on devctl");
794 	server_fd = create_socket(PIPE);
795 	max_fd = max(fd, server_fd) + 1;
796 	while (!romeo_must_die) {
797 		if (!once && !dflag && !nflag) {
798 			// Check to see if we have any events pending.
799 			tv.tv_sec = 0;
800 			tv.tv_usec = 0;
801 			FD_ZERO(&fds);
802 			FD_SET(fd, &fds);
803 			rv = select(fd + 1, &fds, NULL, NULL, &tv);
804 			// No events -> we've processed all pending events
805 			if (rv == 0) {
806 				if (Dflag)
807 					fprintf(stderr, "Calling daemon\n");
808 				cfg.remove_pidfile();
809 				cfg.open_pidfile();
810 				daemon(0, 0);
811 				cfg.write_pidfile();
812 				once++;
813 			}
814 		}
815 		FD_ZERO(&fds);
816 		FD_SET(fd, &fds);
817 		FD_SET(server_fd, &fds);
818 		rv = select(max_fd, &fds, NULL, NULL, NULL);
819 		if (rv == -1) {
820 			if (errno == EINTR)
821 				continue;
822 			err(1, "select");
823 		}
824 		if (FD_ISSET(fd, &fds)) {
825 			rv = read(fd, buffer, sizeof(buffer) - 1);
826 			if (rv > 0) {
827 				notify_clients(buffer, rv);
828 				buffer[rv] = '\0';
829 				while (buffer[--rv] == '\n')
830 					buffer[rv] = '\0';
831 				process_event(buffer);
832 			} else if (rv < 0) {
833 				if (errno != EINTR)
834 					break;
835 			} else {
836 				/* EOF */
837 				break;
838 			}
839 		}
840 		if (FD_ISSET(server_fd, &fds))
841 			new_client(server_fd);
842 	}
843 	close(fd);
844 }
845 
846 /*
847  * functions that the parser uses.
848  */
849 void
850 add_attach(int prio, event_proc *p)
851 {
852 	cfg.add_attach(prio, p);
853 }
854 
855 void
856 add_detach(int prio, event_proc *p)
857 {
858 	cfg.add_detach(prio, p);
859 }
860 
861 void
862 add_directory(const char *dir)
863 {
864 	cfg.add_directory(dir);
865 	free(const_cast<char *>(dir));
866 }
867 
868 void
869 add_nomatch(int prio, event_proc *p)
870 {
871 	cfg.add_nomatch(prio, p);
872 }
873 
874 void
875 add_notify(int prio, event_proc *p)
876 {
877 	cfg.add_notify(prio, p);
878 }
879 
880 event_proc *
881 add_to_event_proc(event_proc *ep, eps *eps)
882 {
883 	if (ep == NULL)
884 		ep = new event_proc();
885 	ep->add(eps);
886 	return (ep);
887 }
888 
889 eps *
890 new_action(const char *cmd)
891 {
892 	eps *e = new action(cmd);
893 	free(const_cast<char *>(cmd));
894 	return (e);
895 }
896 
897 eps *
898 new_match(const char *var, const char *re)
899 {
900 	eps *e = new match(cfg, var, re);
901 	free(const_cast<char *>(var));
902 	free(const_cast<char *>(re));
903 	return (e);
904 }
905 
906 eps *
907 new_media(const char *var, const char *re)
908 {
909 	eps *e = new media(cfg, var, re);
910 	free(const_cast<char *>(var));
911 	free(const_cast<char *>(re));
912 	return (e);
913 }
914 
915 void
916 set_pidfile(const char *name)
917 {
918 	cfg.set_pidfile(name);
919 	free(const_cast<char *>(name));
920 }
921 
922 void
923 set_variable(const char *var, const char *val)
924 {
925 	cfg.set_variable(var, val);
926 	free(const_cast<char *>(var));
927 	free(const_cast<char *>(val));
928 }
929 
930 
931 
932 static void
933 gensighand(int)
934 {
935 	romeo_must_die = 1;
936 	unlink("/var/run/devd.pid");	/* XXX */
937 }
938 
939 static void
940 usage()
941 {
942 	fprintf(stderr, "usage: %s [-Ddn] [-f file]\n", getprogname());
943 	exit(1);
944 }
945 
946 static void
947 check_devd_enabled()
948 {
949 	int val = 0;
950 	size_t len;
951 
952 	len = sizeof(val);
953 	if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
954 		errx(1, "devctl sysctl missing from kernel!");
955 	if (val) {
956 		warnx("Setting " SYSCTL " to 0");
957 		val = 0;
958 		sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
959 	}
960 }
961 
962 /*
963  * main
964  */
965 int
966 main(int argc, char **argv)
967 {
968 	int ch;
969 
970 	check_devd_enabled();
971 	while ((ch = getopt(argc, argv, "Ddf:n")) != -1) {
972 		switch (ch) {
973 		case 'D':
974 			Dflag++;
975 			break;
976 		case 'd':
977 			dflag++;
978 			break;
979 		case 'f':
980 			configfile = optarg;
981 			break;
982 		case 'n':
983 			nflag++;
984 			break;
985 		default:
986 			usage();
987 		}
988 	}
989 
990 	cfg.parse();
991 	if (!dflag && nflag) {
992 		cfg.open_pidfile();
993 		daemon(0, 0);
994 		cfg.write_pidfile();
995 	}
996 	signal(SIGPIPE, SIG_IGN);
997 	signal(SIGHUP, gensighand);
998 	signal(SIGINT, gensighand);
999 	signal(SIGTERM, gensighand);
1000 	event_loop();
1001 	return (0);
1002 }
1003