devd.cc revision 213646 
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 * 4. 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
56/*
57 * DEVD control daemon.
58 */
59
60// TODO list:
61//	o devd.conf and devd man pages need a lot of help:
62//	  - devd needs to document the unix domain socket
63//	  - devd.conf needs more details on the supported statements.
64
65#include <sys/cdefs.h>
66__FBSDID("$FreeBSD: head/sbin/devd/devd.cc 213646 2010-10-09 07:29:13Z imp $");
67
68#include <sys/param.h>
69#include <sys/socket.h>
70#include <sys/stat.h>
71#include <sys/sysctl.h>
72#include <sys/types.h>
73#include <sys/wait.h>
74#include <sys/un.h>
75
76#include <ctype.h>
77#include <dirent.h>
78#include <errno.h>
79#include <err.h>
80#include <fcntl.h>
81#include <libutil.h>
82#include <paths.h>
83#include <regex.h>
84#include <signal.h>
85#include <stdlib.h>
86#include <stdio.h>
87#include <string.h>
88#include <unistd.h>
89
90#include <algorithm>
91#include <map>
92#include <string>
93#include <list>
94#include <vector>
95
96#include "devd.h"		/* C compatible definitions */
97#include "devd.hh"		/* C++ class definitions */
98
99#define PIPE "/var/run/devd.pipe"
100#define CF "/etc/devd.conf"
101#define SYSCTL "hw.bus.devctl_disable"
102
103using namespace std;
104
105extern FILE *yyin;
106extern int lineno;
107
108static const char notify = '!';
109static const char nomatch = '?';
110static const char attach = '+';
111static const char detach = '-';
112
113static struct pidfh *pfh;
114
115int Dflag;
116int dflag;
117int nflag;
118int romeo_must_die = 0;
119
120static const char *configfile = CF;
121
122static void event_loop(void);
123static void usage(void);
124
125template <class T> void
126delete_and_clear(vector<T *> &v)
127{
128	typename vector<T *>::const_iterator i;
129
130	for (i = v.begin(); i != v.end(); i++)
131		delete *i;
132	v.clear();
133}
134
135config cfg;
136
137event_proc::event_proc() : _prio(-1)
138{
139	// nothing
140}
141
142event_proc::~event_proc()
143{
144	delete_and_clear(_epsvec);
145}
146
147void
148event_proc::add(eps *eps)
149{
150	_epsvec.push_back(eps);
151}
152
153bool
154event_proc::matches(config &c)
155{
156	vector<eps *>::const_iterator i;
157
158	for (i = _epsvec.begin(); i != _epsvec.end(); i++)
159		if (!(*i)->do_match(c))
160			return (false);
161	return (true);
162}
163
164bool
165event_proc::run(config &c)
166{
167	vector<eps *>::const_iterator i;
168
169	for (i = _epsvec.begin(); i != _epsvec.end(); i++)
170		if (!(*i)->do_action(c))
171			return (false);
172	return (true);
173}
174
175action::action(const char *cmd)
176	: _cmd(cmd)
177{
178	// nothing
179}
180
181action::~action()
182{
183	// nothing
184}
185
186static int
187my_system(const char *command)
188{
189	pid_t pid, savedpid;
190	int pstat;
191	struct sigaction ign, intact, quitact;
192	sigset_t newsigblock, oldsigblock;
193
194	if (!command)		/* just checking... */
195		return(1);
196
197	/*
198	 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
199	 * existing signal dispositions.
200	 */
201	ign.sa_handler = SIG_IGN;
202	::sigemptyset(&ign.sa_mask);
203	ign.sa_flags = 0;
204	::sigaction(SIGINT, &ign, &intact);
205	::sigaction(SIGQUIT, &ign, &quitact);
206	::sigemptyset(&newsigblock);
207	::sigaddset(&newsigblock, SIGCHLD);
208	::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
209	switch (pid = ::fork()) {
210	case -1:			/* error */
211		break;
212	case 0:				/* child */
213		/*
214		 * Restore original signal dispositions and exec the command.
215		 */
216		::sigaction(SIGINT, &intact, NULL);
217		::sigaction(SIGQUIT,  &quitact, NULL);
218		::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
219		/*
220		 * Close the PID file, and all other open descriptors.
221		 * Inherit std{in,out,err} only.
222		 */
223		cfg.close_pidfile();
224		::closefrom(3);
225		::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
226		::_exit(127);
227	default:			/* parent */
228		savedpid = pid;
229		do {
230			pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0);
231		} while (pid == -1 && errno == EINTR);
232		break;
233	}
234	::sigaction(SIGINT, &intact, NULL);
235	::sigaction(SIGQUIT,  &quitact, NULL);
236	::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
237	return (pid == -1 ? -1 : pstat);
238}
239
240bool
241action::do_action(config &c)
242{
243	string s = c.expand_string(_cmd);
244	if (Dflag)
245		fprintf(stderr, "Executing '%s'\n", s.c_str());
246	my_system(s.c_str());
247	return (true);
248}
249
250match::match(config &c, const char *var, const char *re)
251	: _var(var)
252{
253	_re = "^";
254	_re.append(c.expand_string(string(re)));
255	_re.append("$");
256	regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
257}
258
259match::~match()
260{
261	regfree(&_regex);
262}
263
264bool
265match::do_match(config &c)
266{
267	const string &value = c.get_variable(_var);
268	bool retval;
269
270	if (Dflag)
271		fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
272		    value.c_str(), _re.c_str());
273
274	retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
275	return retval;
276}
277
278#include <sys/sockio.h>
279#include <net/if.h>
280#include <net/if_media.h>
281
282media::media(config &, const char *var, const char *type)
283	: _var(var), _type(-1)
284{
285	static struct ifmedia_description media_types[] = {
286		{ IFM_ETHER,		"Ethernet" },
287		{ IFM_TOKEN,		"Tokenring" },
288		{ IFM_FDDI,		"FDDI" },
289		{ IFM_IEEE80211,	"802.11" },
290		{ IFM_ATM,		"ATM" },
291		{ IFM_CARP,		"CARP" },
292		{ -1,			"unknown" },
293		{ 0, NULL },
294	};
295	for (int i = 0; media_types[i].ifmt_string != NULL; i++)
296		if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
297			_type = media_types[i].ifmt_word;
298			break;
299		}
300}
301
302media::~media()
303{
304}
305
306bool
307media::do_match(config &c)
308{
309	string value;
310	struct ifmediareq ifmr;
311	bool retval;
312	int s;
313
314	// Since we can be called from both a device attach/detach
315	// context where device-name is defined and what we want,
316	// as well as from a link status context, where subsystem is
317	// the name of interest, first try device-name and fall back
318	// to subsystem if none exists.
319	value = c.get_variable("device-name");
320	if (value.length() == 0)
321		value = c.get_variable("subsystem");
322	if (Dflag)
323		fprintf(stderr, "Testing media type of %s against 0x%x\n",
324		    value.c_str(), _type);
325
326	retval = false;
327
328	s = socket(PF_INET, SOCK_DGRAM, 0);
329	if (s >= 0) {
330		memset(&ifmr, 0, sizeof(ifmr));
331		strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
332
333		if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
334		    ifmr.ifm_status & IFM_AVALID) {
335			if (Dflag)
336				fprintf(stderr, "%s has media type 0x%x\n",
337				    value.c_str(), IFM_TYPE(ifmr.ifm_active));
338			retval = (IFM_TYPE(ifmr.ifm_active) == _type);
339		} else if (_type == -1) {
340			if (Dflag)
341				fprintf(stderr, "%s has unknown media type\n",
342				    value.c_str());
343			retval = true;
344		}
345		close(s);
346	}
347
348	return retval;
349}
350
351const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
352const string var_list::nothing = "";
353
354const string &
355var_list::get_variable(const string &var) const
356{
357	map<string, string>::const_iterator i;
358
359	i = _vars.find(var);
360	if (i == _vars.end())
361		return (var_list::bogus);
362	return (i->second);
363}
364
365bool
366var_list::is_set(const string &var) const
367{
368	return (_vars.find(var) != _vars.end());
369}
370
371void
372var_list::set_variable(const string &var, const string &val)
373{
374	if (Dflag)
375		fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
376	_vars[var] = val;
377}
378
379void
380config::reset(void)
381{
382	_dir_list.clear();
383	delete_and_clear(_var_list_table);
384	delete_and_clear(_attach_list);
385	delete_and_clear(_detach_list);
386	delete_and_clear(_nomatch_list);
387	delete_and_clear(_notify_list);
388}
389
390void
391config::parse_one_file(const char *fn)
392{
393	if (Dflag)
394		fprintf(stderr, "Parsing %s\n", fn);
395	yyin = fopen(fn, "r");
396	if (yyin == NULL)
397		err(1, "Cannot open config file %s", fn);
398	lineno = 1;
399	if (yyparse() != 0)
400		errx(1, "Cannot parse %s at line %d", fn, lineno);
401	fclose(yyin);
402}
403
404void
405config::parse_files_in_dir(const char *dirname)
406{
407	DIR *dirp;
408	struct dirent *dp;
409	char path[PATH_MAX];
410
411	if (Dflag)
412		fprintf(stderr, "Parsing files in %s\n", dirname);
413	dirp = opendir(dirname);
414	if (dirp == NULL)
415		return;
416	readdir(dirp);		/* Skip . */
417	readdir(dirp);		/* Skip .. */
418	while ((dp = readdir(dirp)) != NULL) {
419		if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
420			snprintf(path, sizeof(path), "%s/%s",
421			    dirname, dp->d_name);
422			parse_one_file(path);
423		}
424	}
425}
426
427class epv_greater {
428public:
429	int operator()(event_proc *const&l1, event_proc *const&l2)
430	{
431		return (l1->get_priority() > l2->get_priority());
432	}
433};
434
435void
436config::sort_vector(vector<event_proc *> &v)
437{
438	sort(v.begin(), v.end(), epv_greater());
439}
440
441void
442config::parse(void)
443{
444	vector<string>::const_iterator i;
445
446	parse_one_file(configfile);
447	for (i = _dir_list.begin(); i != _dir_list.end(); i++)
448		parse_files_in_dir((*i).c_str());
449	sort_vector(_attach_list);
450	sort_vector(_detach_list);
451	sort_vector(_nomatch_list);
452	sort_vector(_notify_list);
453}
454
455void
456config::open_pidfile()
457{
458	pid_t otherpid;
459
460	if (_pidfile == "")
461		return;
462	pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
463	if (pfh == NULL) {
464		if (errno == EEXIST)
465			errx(1, "devd already running, pid: %d", (int)otherpid);
466		warn("cannot open pid file");
467	}
468}
469
470void
471config::write_pidfile()
472{
473
474	pidfile_write(pfh);
475}
476
477void
478config::close_pidfile()
479{
480
481	pidfile_close(pfh);
482}
483
484void
485config::remove_pidfile()
486{
487
488	pidfile_remove(pfh);
489}
490
491void
492config::add_attach(int prio, event_proc *p)
493{
494	p->set_priority(prio);
495	_attach_list.push_back(p);
496}
497
498void
499config::add_detach(int prio, event_proc *p)
500{
501	p->set_priority(prio);
502	_detach_list.push_back(p);
503}
504
505void
506config::add_directory(const char *dir)
507{
508	_dir_list.push_back(string(dir));
509}
510
511void
512config::add_nomatch(int prio, event_proc *p)
513{
514	p->set_priority(prio);
515	_nomatch_list.push_back(p);
516}
517
518void
519config::add_notify(int prio, event_proc *p)
520{
521	p->set_priority(prio);
522	_notify_list.push_back(p);
523}
524
525void
526config::set_pidfile(const char *fn)
527{
528	_pidfile = string(fn);
529}
530
531void
532config::push_var_table()
533{
534	var_list *vl;
535
536	vl = new var_list();
537	_var_list_table.push_back(vl);
538	if (Dflag)
539		fprintf(stderr, "Pushing table\n");
540}
541
542void
543config::pop_var_table()
544{
545	delete _var_list_table.back();
546	_var_list_table.pop_back();
547	if (Dflag)
548		fprintf(stderr, "Popping table\n");
549}
550
551void
552config::set_variable(const char *var, const char *val)
553{
554	_var_list_table.back()->set_variable(var, val);
555}
556
557const string &
558config::get_variable(const string &var)
559{
560	vector<var_list *>::reverse_iterator i;
561
562	for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
563		if ((*i)->is_set(var))
564			return ((*i)->get_variable(var));
565	}
566	return (var_list::nothing);
567}
568
569bool
570config::is_id_char(char ch)
571{
572	return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
573	    ch == '-'));
574}
575
576void
577config::expand_one(const char *&src, string &dst)
578{
579	int count;
580	string buffer;
581
582	src++;
583	// $$ -> $
584	if (*src == '$') {
585		dst.append(src++, 1);
586		return;
587	}
588
589	// $(foo) -> $(foo)
590	// Not sure if I want to support this or not, so for now we just pass
591	// it through.
592	if (*src == '(') {
593		dst.append("$");
594		count = 1;
595		/* If the string ends before ) is matched , return. */
596		while (count > 0 && *src) {
597			if (*src == ')')
598				count--;
599			else if (*src == '(')
600				count++;
601			dst.append(src++, 1);
602		}
603		return;
604	}
605
606	// ${^A-Za-z] -> $\1
607	if (!isalpha(*src)) {
608		dst.append("$");
609		dst.append(src++, 1);
610		return;
611	}
612
613	// $var -> replace with value
614	do {
615		buffer.append(src++, 1);
616	} while (is_id_char(*src));
617	buffer.append("", 1);
618	dst.append(get_variable(buffer.c_str()));
619}
620
621const string
622config::expand_string(const string &s)
623{
624	const char *src;
625	string dst;
626
627	src = s.c_str();
628	while (*src) {
629		if (*src == '$')
630			expand_one(src, dst);
631		else
632			dst.append(src++, 1);
633	}
634	dst.append("", 1);
635
636	return (dst);
637}
638
639bool
640config::chop_var(char *&buffer, char *&lhs, char *&rhs)
641{
642	char *walker;
643
644	if (*buffer == '\0')
645		return (false);
646	walker = lhs = buffer;
647	while (is_id_char(*walker))
648		walker++;
649	if (*walker != '=')
650		return (false);
651	walker++;		// skip =
652	if (*walker == '"') {
653		walker++;	// skip "
654		rhs = walker;
655		while (*walker && *walker != '"')
656			walker++;
657		if (*walker != '"')
658			return (false);
659		rhs[-2] = '\0';
660		*walker++ = '\0';
661	} else {
662		rhs = walker;
663		while (*walker && !isspace(*walker))
664			walker++;
665		if (*walker != '\0')
666			*walker++ = '\0';
667		rhs[-1] = '\0';
668	}
669	while (isspace(*walker))
670		walker++;
671	buffer = walker;
672	return (true);
673}
674
675
676char *
677config::set_vars(char *buffer)
678{
679	char *lhs;
680	char *rhs;
681
682	while (1) {
683		if (!chop_var(buffer, lhs, rhs))
684			break;
685		set_variable(lhs, rhs);
686	}
687	return (buffer);
688}
689
690void
691config::find_and_execute(char type)
692{
693	vector<event_proc *> *l;
694	vector<event_proc *>::const_iterator i;
695	const char *s;
696
697	switch (type) {
698	default:
699		return;
700	case notify:
701		l = &_notify_list;
702		s = "notify";
703		break;
704	case nomatch:
705		l = &_nomatch_list;
706		s = "nomatch";
707		break;
708	case attach:
709		l = &_attach_list;
710		s = "attach";
711		break;
712	case detach:
713		l = &_detach_list;
714		s = "detach";
715		break;
716	}
717	if (Dflag)
718		fprintf(stderr, "Processing %s event\n", s);
719	for (i = l->begin(); i != l->end(); i++) {
720		if ((*i)->matches(*this)) {
721			(*i)->run(*this);
722			break;
723		}
724	}
725
726}
727
728
729static void
730process_event(char *buffer)
731{
732	char type;
733	char *sp;
734
735	sp = buffer + 1;
736	if (Dflag)
737		fprintf(stderr, "Processing event '%s'\n", buffer);
738	type = *buffer++;
739	cfg.push_var_table();
740	// No match doesn't have a device, and the format is a little
741	// different, so handle it separately.
742	switch (type) {
743	case notify:
744		sp = cfg.set_vars(sp);
745		break;
746	case nomatch:
747		//? at location pnp-info on bus
748		sp = strchr(sp, ' ');
749		if (sp == NULL)
750			return;	/* Can't happen? */
751		*sp++ = '\0';
752		while (isspace(*sp))
753			sp++;
754		if (strncmp(sp, "at ", 3) == 0)
755			sp += 3;
756		sp = cfg.set_vars(sp);
757		while (isspace(*sp))
758			sp++;
759		if (strncmp(sp, "on ", 3) == 0)
760			cfg.set_variable("bus", sp + 3);
761		break;
762	case attach:	/*FALLTHROUGH*/
763	case detach:
764		sp = strchr(sp, ' ');
765		if (sp == NULL)
766			return;	/* Can't happen? */
767		*sp++ = '\0';
768		cfg.set_variable("device-name", buffer);
769		while (isspace(*sp))
770			sp++;
771		if (strncmp(sp, "at ", 3) == 0)
772			sp += 3;
773		sp = cfg.set_vars(sp);
774		while (isspace(*sp))
775			sp++;
776		if (strncmp(sp, "on ", 3) == 0)
777			cfg.set_variable("bus", sp + 3);
778		break;
779	}
780
781	cfg.find_and_execute(type);
782	cfg.pop_var_table();
783}
784
785int
786create_socket(const char *name)
787{
788	int fd, slen;
789	struct sockaddr_un sun;
790
791	if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
792		err(1, "socket");
793	bzero(&sun, sizeof(sun));
794	sun.sun_family = AF_UNIX;
795	strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
796	slen = SUN_LEN(&sun);
797	unlink(name);
798	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
799	    	err(1, "fcntl");
800	if (bind(fd, (struct sockaddr *) & sun, slen) < 0)
801		err(1, "bind");
802	listen(fd, 4);
803	chown(name, 0, 0);	/* XXX - root.wheel */
804	chmod(name, 0666);
805	return (fd);
806}
807
808list<int> clients;
809
810void
811notify_clients(const char *data, int len)
812{
813	list<int> bad;
814	list<int>::const_iterator i;
815
816	for (i = clients.begin(); i != clients.end(); i++) {
817		if (write(*i, data, len) <= 0) {
818			bad.push_back(*i);
819			close(*i);
820		}
821	}
822
823	for (i = bad.begin(); i != bad.end(); i++)
824		clients.erase(find(clients.begin(), clients.end(), *i));
825}
826
827void
828new_client(int fd)
829{
830	int s;
831
832	s = accept(fd, NULL, NULL);
833	if (s != -1)
834		clients.push_back(s);
835}
836
837static void
838event_loop(void)
839{
840	int rv;
841	int fd;
842	char buffer[DEVCTL_MAXBUF];
843	int once = 0;
844	int server_fd, max_fd;
845	timeval tv;
846	fd_set fds;
847
848	fd = open(PATH_DEVCTL, O_RDONLY);
849	if (fd == -1)
850		err(1, "Can't open devctl device %s", PATH_DEVCTL);
851	if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
852		err(1, "Can't set close-on-exec flag on devctl");
853	server_fd = create_socket(PIPE);
854	max_fd = max(fd, server_fd) + 1;
855	while (1) {
856		if (romeo_must_die)
857			break;
858		if (!once && !dflag && !nflag) {
859			// Check to see if we have any events pending.
860			tv.tv_sec = 0;
861			tv.tv_usec = 0;
862			FD_ZERO(&fds);
863			FD_SET(fd, &fds);
864			rv = select(fd + 1, &fds, &fds, &fds, &tv);
865			// No events -> we've processed all pending events
866			if (rv == 0) {
867				if (Dflag)
868					fprintf(stderr, "Calling daemon\n");
869				cfg.remove_pidfile();
870				cfg.open_pidfile();
871				daemon(0, 0);
872				cfg.write_pidfile();
873				once++;
874			}
875		}
876		FD_ZERO(&fds);
877		FD_SET(fd, &fds);
878		FD_SET(server_fd, &fds);
879		rv = select(max_fd, &fds, NULL, NULL, NULL);
880		if (rv == -1) {
881			if (errno == EINTR)
882				continue;
883			err(1, "select");
884		}
885		if (FD_ISSET(fd, &fds)) {
886			rv = read(fd, buffer, sizeof(buffer) - 1);
887			if (rv > 0) {
888				notify_clients(buffer, rv);
889				buffer[rv] = '\0';
890				while (buffer[--rv] == '\n')
891					buffer[rv] = '\0';
892				process_event(buffer);
893			} else if (rv < 0) {
894				if (errno != EINTR)
895					break;
896			} else {
897				/* EOF */
898				break;
899			}
900		}
901		if (FD_ISSET(server_fd, &fds))
902			new_client(server_fd);
903	}
904	close(fd);
905}
906
907/*
908 * functions that the parser uses.
909 */
910void
911add_attach(int prio, event_proc *p)
912{
913	cfg.add_attach(prio, p);
914}
915
916void
917add_detach(int prio, event_proc *p)
918{
919	cfg.add_detach(prio, p);
920}
921
922void
923add_directory(const char *dir)
924{
925	cfg.add_directory(dir);
926	free(const_cast<char *>(dir));
927}
928
929void
930add_nomatch(int prio, event_proc *p)
931{
932	cfg.add_nomatch(prio, p);
933}
934
935void
936add_notify(int prio, event_proc *p)
937{
938	cfg.add_notify(prio, p);
939}
940
941event_proc *
942add_to_event_proc(event_proc *ep, eps *eps)
943{
944	if (ep == NULL)
945		ep = new event_proc();
946	ep->add(eps);
947	return (ep);
948}
949
950eps *
951new_action(const char *cmd)
952{
953	eps *e = new action(cmd);
954	free(const_cast<char *>(cmd));
955	return (e);
956}
957
958eps *
959new_match(const char *var, const char *re)
960{
961	eps *e = new match(cfg, var, re);
962	free(const_cast<char *>(var));
963	free(const_cast<char *>(re));
964	return (e);
965}
966
967eps *
968new_media(const char *var, const char *re)
969{
970	eps *e = new media(cfg, var, re);
971	free(const_cast<char *>(var));
972	free(const_cast<char *>(re));
973	return (e);
974}
975
976void
977set_pidfile(const char *name)
978{
979	cfg.set_pidfile(name);
980	free(const_cast<char *>(name));
981}
982
983void
984set_variable(const char *var, const char *val)
985{
986	cfg.set_variable(var, val);
987	free(const_cast<char *>(var));
988	free(const_cast<char *>(val));
989}
990
991
992
993static void
994gensighand(int)
995{
996	romeo_must_die++;
997	_exit(0);
998}
999
1000static void
1001usage()
1002{
1003	fprintf(stderr, "usage: %s [-Ddn] [-f file]\n", getprogname());
1004	exit(1);
1005}
1006
1007static void
1008check_devd_enabled()
1009{
1010	int val = 0;
1011	size_t len;
1012
1013	len = sizeof(val);
1014	if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
1015		errx(1, "devctl sysctl missing from kernel!");
1016	if (val) {
1017		warnx("Setting " SYSCTL " to 0");
1018		val = 0;
1019		sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
1020	}
1021}
1022
1023/*
1024 * main
1025 */
1026int
1027main(int argc, char **argv)
1028{
1029	int ch;
1030
1031	check_devd_enabled();
1032	while ((ch = getopt(argc, argv, "Ddf:n")) != -1) {
1033		switch (ch) {
1034		case 'D':
1035			Dflag++;
1036			break;
1037		case 'd':
1038			dflag++;
1039			break;
1040		case 'f':
1041			configfile = optarg;
1042			break;
1043		case 'n':
1044			nflag++;
1045			break;
1046		default:
1047			usage();
1048		}
1049	}
1050
1051	cfg.parse();
1052	if (!dflag && nflag) {
1053		cfg.open_pidfile();
1054		daemon(0, 0);
1055		cfg.write_pidfile();
1056	}
1057	signal(SIGPIPE, SIG_IGN);
1058	signal(SIGHUP, gensighand);
1059	signal(SIGINT, gensighand);
1060	signal(SIGTERM, gensighand);
1061	event_loop();
1062	return (0);
1063}
1064