devd.cc revision 240823 
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 240823 2012-09-22 12:42:51Z pjd $");
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	if (!c.expand_string(string(re)).empty() &&
255	    c.expand_string(string(re)).at(0) == '!') {
256		_re.append(c.expand_string(string(re)).substr(1));
257		_inv = 1;
258	} else {
259		_re.append(c.expand_string(string(re)));
260		_inv = 0;
261	}
262	_re.append("$");
263	regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
264}
265
266match::~match()
267{
268	regfree(&_regex);
269}
270
271bool
272match::do_match(config &c)
273{
274	const string &value = c.get_variable(_var);
275	bool retval;
276
277	if (Dflag)
278		fprintf(stderr, "Testing %s=%s against %s, invert=%d\n",
279		    _var.c_str(), value.c_str(), _re.c_str(), _inv);
280
281	retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
282	if (_inv == 1)
283		retval = (retval == 0) ? 1 : 0;
284
285	return retval;
286}
287
288#include <sys/sockio.h>
289#include <net/if.h>
290#include <net/if_media.h>
291
292media::media(config &, const char *var, const char *type)
293	: _var(var), _type(-1)
294{
295	static struct ifmedia_description media_types[] = {
296		{ IFM_ETHER,		"Ethernet" },
297		{ IFM_TOKEN,		"Tokenring" },
298		{ IFM_FDDI,		"FDDI" },
299		{ IFM_IEEE80211,	"802.11" },
300		{ IFM_ATM,		"ATM" },
301		{ -1,			"unknown" },
302		{ 0, NULL },
303	};
304	for (int i = 0; media_types[i].ifmt_string != NULL; i++)
305		if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
306			_type = media_types[i].ifmt_word;
307			break;
308		}
309}
310
311media::~media()
312{
313}
314
315bool
316media::do_match(config &c)
317{
318	string value;
319	struct ifmediareq ifmr;
320	bool retval;
321	int s;
322
323	// Since we can be called from both a device attach/detach
324	// context where device-name is defined and what we want,
325	// as well as from a link status context, where subsystem is
326	// the name of interest, first try device-name and fall back
327	// to subsystem if none exists.
328	value = c.get_variable("device-name");
329	if (value.length() == 0)
330		value = c.get_variable("subsystem");
331	if (Dflag)
332		fprintf(stderr, "Testing media type of %s against 0x%x\n",
333		    value.c_str(), _type);
334
335	retval = false;
336
337	s = socket(PF_INET, SOCK_DGRAM, 0);
338	if (s >= 0) {
339		memset(&ifmr, 0, sizeof(ifmr));
340		strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
341
342		if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
343		    ifmr.ifm_status & IFM_AVALID) {
344			if (Dflag)
345				fprintf(stderr, "%s has media type 0x%x\n",
346				    value.c_str(), IFM_TYPE(ifmr.ifm_active));
347			retval = (IFM_TYPE(ifmr.ifm_active) == _type);
348		} else if (_type == -1) {
349			if (Dflag)
350				fprintf(stderr, "%s has unknown media type\n",
351				    value.c_str());
352			retval = true;
353		}
354		close(s);
355	}
356
357	return retval;
358}
359
360const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
361const string var_list::nothing = "";
362
363const string &
364var_list::get_variable(const string &var) const
365{
366	map<string, string>::const_iterator i;
367
368	i = _vars.find(var);
369	if (i == _vars.end())
370		return (var_list::bogus);
371	return (i->second);
372}
373
374bool
375var_list::is_set(const string &var) const
376{
377	return (_vars.find(var) != _vars.end());
378}
379
380void
381var_list::set_variable(const string &var, const string &val)
382{
383	if (Dflag)
384		fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
385	_vars[var] = val;
386}
387
388void
389config::reset(void)
390{
391	_dir_list.clear();
392	delete_and_clear(_var_list_table);
393	delete_and_clear(_attach_list);
394	delete_and_clear(_detach_list);
395	delete_and_clear(_nomatch_list);
396	delete_and_clear(_notify_list);
397}
398
399void
400config::parse_one_file(const char *fn)
401{
402	if (Dflag)
403		fprintf(stderr, "Parsing %s\n", fn);
404	yyin = fopen(fn, "r");
405	if (yyin == NULL)
406		err(1, "Cannot open config file %s", fn);
407	lineno = 1;
408	if (yyparse() != 0)
409		errx(1, "Cannot parse %s at line %d", fn, lineno);
410	fclose(yyin);
411}
412
413void
414config::parse_files_in_dir(const char *dirname)
415{
416	DIR *dirp;
417	struct dirent *dp;
418	char path[PATH_MAX];
419
420	if (Dflag)
421		fprintf(stderr, "Parsing files in %s\n", dirname);
422	dirp = opendir(dirname);
423	if (dirp == NULL)
424		return;
425	readdir(dirp);		/* Skip . */
426	readdir(dirp);		/* Skip .. */
427	while ((dp = readdir(dirp)) != NULL) {
428		if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
429			snprintf(path, sizeof(path), "%s/%s",
430			    dirname, dp->d_name);
431			parse_one_file(path);
432		}
433	}
434	closedir(dirp);
435}
436
437class epv_greater {
438public:
439	int operator()(event_proc *const&l1, event_proc *const&l2)
440	{
441		return (l1->get_priority() > l2->get_priority());
442	}
443};
444
445void
446config::sort_vector(vector<event_proc *> &v)
447{
448	sort(v.begin(), v.end(), epv_greater());
449}
450
451void
452config::parse(void)
453{
454	vector<string>::const_iterator i;
455
456	parse_one_file(configfile);
457	for (i = _dir_list.begin(); i != _dir_list.end(); i++)
458		parse_files_in_dir((*i).c_str());
459	sort_vector(_attach_list);
460	sort_vector(_detach_list);
461	sort_vector(_nomatch_list);
462	sort_vector(_notify_list);
463}
464
465void
466config::open_pidfile()
467{
468	pid_t otherpid;
469
470	if (_pidfile == "")
471		return;
472	pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
473	if (pfh == NULL) {
474		if (errno == EEXIST)
475			errx(1, "devd already running, pid: %d", (int)otherpid);
476		warn("cannot open pid file");
477	}
478}
479
480void
481config::write_pidfile()
482{
483
484	pidfile_write(pfh);
485}
486
487void
488config::close_pidfile()
489{
490
491	pidfile_close(pfh);
492}
493
494void
495config::remove_pidfile()
496{
497
498	pidfile_remove(pfh);
499}
500
501void
502config::add_attach(int prio, event_proc *p)
503{
504	p->set_priority(prio);
505	_attach_list.push_back(p);
506}
507
508void
509config::add_detach(int prio, event_proc *p)
510{
511	p->set_priority(prio);
512	_detach_list.push_back(p);
513}
514
515void
516config::add_directory(const char *dir)
517{
518	_dir_list.push_back(string(dir));
519}
520
521void
522config::add_nomatch(int prio, event_proc *p)
523{
524	p->set_priority(prio);
525	_nomatch_list.push_back(p);
526}
527
528void
529config::add_notify(int prio, event_proc *p)
530{
531	p->set_priority(prio);
532	_notify_list.push_back(p);
533}
534
535void
536config::set_pidfile(const char *fn)
537{
538	_pidfile = string(fn);
539}
540
541void
542config::push_var_table()
543{
544	var_list *vl;
545
546	vl = new var_list();
547	_var_list_table.push_back(vl);
548	if (Dflag)
549		fprintf(stderr, "Pushing table\n");
550}
551
552void
553config::pop_var_table()
554{
555	delete _var_list_table.back();
556	_var_list_table.pop_back();
557	if (Dflag)
558		fprintf(stderr, "Popping table\n");
559}
560
561void
562config::set_variable(const char *var, const char *val)
563{
564	_var_list_table.back()->set_variable(var, val);
565}
566
567const string &
568config::get_variable(const string &var)
569{
570	vector<var_list *>::reverse_iterator i;
571
572	for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
573		if ((*i)->is_set(var))
574			return ((*i)->get_variable(var));
575	}
576	return (var_list::nothing);
577}
578
579bool
580config::is_id_char(char ch)
581{
582	return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
583	    ch == '-'));
584}
585
586void
587config::expand_one(const char *&src, string &dst)
588{
589	int count;
590	string buffer;
591
592	src++;
593	// $$ -> $
594	if (*src == '$') {
595		dst.append(src++, 1);
596		return;
597	}
598
599	// $(foo) -> $(foo)
600	// Not sure if I want to support this or not, so for now we just pass
601	// it through.
602	if (*src == '(') {
603		dst.append("$");
604		count = 1;
605		/* If the string ends before ) is matched , return. */
606		while (count > 0 && *src) {
607			if (*src == ')')
608				count--;
609			else if (*src == '(')
610				count++;
611			dst.append(src++, 1);
612		}
613		return;
614	}
615
616	// ${^A-Za-z] -> $\1
617	if (!isalpha(*src)) {
618		dst.append("$");
619		dst.append(src++, 1);
620		return;
621	}
622
623	// $var -> replace with value
624	do {
625		buffer.append(src++, 1);
626	} while (is_id_char(*src));
627	buffer.append("", 1);
628	dst.append(get_variable(buffer.c_str()));
629}
630
631const string
632config::expand_string(const string &s)
633{
634	const char *src;
635	string dst;
636
637	src = s.c_str();
638	while (*src) {
639		if (*src == '$')
640			expand_one(src, dst);
641		else
642			dst.append(src++, 1);
643	}
644	dst.append("", 1);
645
646	return (dst);
647}
648
649bool
650config::chop_var(char *&buffer, char *&lhs, char *&rhs)
651{
652	char *walker;
653
654	if (*buffer == '\0')
655		return (false);
656	walker = lhs = buffer;
657	while (is_id_char(*walker))
658		walker++;
659	if (*walker != '=')
660		return (false);
661	walker++;		// skip =
662	if (*walker == '"') {
663		walker++;	// skip "
664		rhs = walker;
665		while (*walker && *walker != '"')
666			walker++;
667		if (*walker != '"')
668			return (false);
669		rhs[-2] = '\0';
670		*walker++ = '\0';
671	} else {
672		rhs = walker;
673		while (*walker && !isspace(*walker))
674			walker++;
675		if (*walker != '\0')
676			*walker++ = '\0';
677		rhs[-1] = '\0';
678	}
679	while (isspace(*walker))
680		walker++;
681	buffer = walker;
682	return (true);
683}
684
685
686char *
687config::set_vars(char *buffer)
688{
689	char *lhs;
690	char *rhs;
691
692	while (1) {
693		if (!chop_var(buffer, lhs, rhs))
694			break;
695		set_variable(lhs, rhs);
696	}
697	return (buffer);
698}
699
700void
701config::find_and_execute(char type)
702{
703	vector<event_proc *> *l;
704	vector<event_proc *>::const_iterator i;
705	const char *s;
706
707	switch (type) {
708	default:
709		return;
710	case notify:
711		l = &_notify_list;
712		s = "notify";
713		break;
714	case nomatch:
715		l = &_nomatch_list;
716		s = "nomatch";
717		break;
718	case attach:
719		l = &_attach_list;
720		s = "attach";
721		break;
722	case detach:
723		l = &_detach_list;
724		s = "detach";
725		break;
726	}
727	if (Dflag)
728		fprintf(stderr, "Processing %s event\n", s);
729	for (i = l->begin(); i != l->end(); i++) {
730		if ((*i)->matches(*this)) {
731			(*i)->run(*this);
732			break;
733		}
734	}
735
736}
737
738
739static void
740process_event(char *buffer)
741{
742	char type;
743	char *sp;
744
745	sp = buffer + 1;
746	if (Dflag)
747		fprintf(stderr, "Processing event '%s'\n", buffer);
748	type = *buffer++;
749	cfg.push_var_table();
750	// No match doesn't have a device, and the format is a little
751	// different, so handle it separately.
752	switch (type) {
753	case notify:
754		sp = cfg.set_vars(sp);
755		break;
756	case nomatch:
757		//? at location pnp-info on bus
758		sp = strchr(sp, ' ');
759		if (sp == NULL)
760			return;	/* Can't happen? */
761		*sp++ = '\0';
762		while (isspace(*sp))
763			sp++;
764		if (strncmp(sp, "at ", 3) == 0)
765			sp += 3;
766		sp = cfg.set_vars(sp);
767		while (isspace(*sp))
768			sp++;
769		if (strncmp(sp, "on ", 3) == 0)
770			cfg.set_variable("bus", sp + 3);
771		break;
772	case attach:	/*FALLTHROUGH*/
773	case detach:
774		sp = strchr(sp, ' ');
775		if (sp == NULL)
776			return;	/* Can't happen? */
777		*sp++ = '\0';
778		cfg.set_variable("device-name", buffer);
779		while (isspace(*sp))
780			sp++;
781		if (strncmp(sp, "at ", 3) == 0)
782			sp += 3;
783		sp = cfg.set_vars(sp);
784		while (isspace(*sp))
785			sp++;
786		if (strncmp(sp, "on ", 3) == 0)
787			cfg.set_variable("bus", sp + 3);
788		break;
789	}
790
791	cfg.find_and_execute(type);
792	cfg.pop_var_table();
793}
794
795int
796create_socket(const char *name)
797{
798	int fd, slen;
799	struct sockaddr_un sun;
800
801	if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
802		err(1, "socket");
803	bzero(&sun, sizeof(sun));
804	sun.sun_family = AF_UNIX;
805	strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
806	slen = SUN_LEN(&sun);
807	unlink(name);
808	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
809	    	err(1, "fcntl");
810	if (::bind(fd, (struct sockaddr *) & sun, slen) < 0)
811		err(1, "bind");
812	listen(fd, 4);
813	chown(name, 0, 0);	/* XXX - root.wheel */
814	chmod(name, 0666);
815	return (fd);
816}
817
818list<int> clients;
819
820void
821notify_clients(const char *data, int len)
822{
823	list<int> bad;
824	list<int>::const_iterator i;
825
826	for (i = clients.begin(); i != clients.end(); i++) {
827		if (write(*i, data, len) <= 0) {
828			bad.push_back(*i);
829			close(*i);
830		}
831	}
832
833	for (i = bad.begin(); i != bad.end(); i++)
834		clients.erase(find(clients.begin(), clients.end(), *i));
835}
836
837void
838new_client(int fd)
839{
840	int s;
841
842	s = accept(fd, NULL, NULL);
843	if (s != -1)
844		clients.push_back(s);
845}
846
847static void
848event_loop(void)
849{
850	int rv;
851	int fd;
852	char buffer[DEVCTL_MAXBUF];
853	int once = 0;
854	int server_fd, max_fd;
855	timeval tv;
856	fd_set fds;
857
858	fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC);
859	if (fd == -1)
860		err(1, "Can't open devctl device %s", PATH_DEVCTL);
861	server_fd = create_socket(PIPE);
862	max_fd = max(fd, server_fd) + 1;
863	while (1) {
864		if (romeo_must_die)
865			break;
866		if (!once && !dflag && !nflag) {
867			// Check to see if we have any events pending.
868			tv.tv_sec = 0;
869			tv.tv_usec = 0;
870			FD_ZERO(&fds);
871			FD_SET(fd, &fds);
872			rv = select(fd + 1, &fds, &fds, &fds, &tv);
873			// No events -> we've processed all pending events
874			if (rv == 0) {
875				if (Dflag)
876					fprintf(stderr, "Calling daemon\n");
877				cfg.remove_pidfile();
878				cfg.open_pidfile();
879				daemon(0, 0);
880				cfg.write_pidfile();
881				once++;
882			}
883		}
884		FD_ZERO(&fds);
885		FD_SET(fd, &fds);
886		FD_SET(server_fd, &fds);
887		rv = select(max_fd, &fds, NULL, NULL, NULL);
888		if (rv == -1) {
889			if (errno == EINTR)
890				continue;
891			err(1, "select");
892		}
893		if (FD_ISSET(fd, &fds)) {
894			rv = read(fd, buffer, sizeof(buffer) - 1);
895			if (rv > 0) {
896				notify_clients(buffer, rv);
897				buffer[rv] = '\0';
898				while (buffer[--rv] == '\n')
899					buffer[rv] = '\0';
900				process_event(buffer);
901			} else if (rv < 0) {
902				if (errno != EINTR)
903					break;
904			} else {
905				/* EOF */
906				break;
907			}
908		}
909		if (FD_ISSET(server_fd, &fds))
910			new_client(server_fd);
911	}
912	close(fd);
913}
914
915/*
916 * functions that the parser uses.
917 */
918void
919add_attach(int prio, event_proc *p)
920{
921	cfg.add_attach(prio, p);
922}
923
924void
925add_detach(int prio, event_proc *p)
926{
927	cfg.add_detach(prio, p);
928}
929
930void
931add_directory(const char *dir)
932{
933	cfg.add_directory(dir);
934	free(const_cast<char *>(dir));
935}
936
937void
938add_nomatch(int prio, event_proc *p)
939{
940	cfg.add_nomatch(prio, p);
941}
942
943void
944add_notify(int prio, event_proc *p)
945{
946	cfg.add_notify(prio, p);
947}
948
949event_proc *
950add_to_event_proc(event_proc *ep, eps *eps)
951{
952	if (ep == NULL)
953		ep = new event_proc();
954	ep->add(eps);
955	return (ep);
956}
957
958eps *
959new_action(const char *cmd)
960{
961	eps *e = new action(cmd);
962	free(const_cast<char *>(cmd));
963	return (e);
964}
965
966eps *
967new_match(const char *var, const char *re)
968{
969	eps *e = new match(cfg, var, re);
970	free(const_cast<char *>(var));
971	free(const_cast<char *>(re));
972	return (e);
973}
974
975eps *
976new_media(const char *var, const char *re)
977{
978	eps *e = new media(cfg, var, re);
979	free(const_cast<char *>(var));
980	free(const_cast<char *>(re));
981	return (e);
982}
983
984void
985set_pidfile(const char *name)
986{
987	cfg.set_pidfile(name);
988	free(const_cast<char *>(name));
989}
990
991void
992set_variable(const char *var, const char *val)
993{
994	cfg.set_variable(var, val);
995	free(const_cast<char *>(var));
996	free(const_cast<char *>(val));
997}
998
999
1000
1001static void
1002gensighand(int)
1003{
1004	romeo_must_die++;
1005	_exit(0);
1006}
1007
1008static void
1009usage()
1010{
1011	fprintf(stderr, "usage: %s [-Ddn] [-f file]\n", getprogname());
1012	exit(1);
1013}
1014
1015static void
1016check_devd_enabled()
1017{
1018	int val = 0;
1019	size_t len;
1020
1021	len = sizeof(val);
1022	if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
1023		errx(1, "devctl sysctl missing from kernel!");
1024	if (val) {
1025		warnx("Setting " SYSCTL " to 0");
1026		val = 0;
1027		sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
1028	}
1029}
1030
1031/*
1032 * main
1033 */
1034int
1035main(int argc, char **argv)
1036{
1037	int ch;
1038
1039	check_devd_enabled();
1040	while ((ch = getopt(argc, argv, "Ddf:n")) != -1) {
1041		switch (ch) {
1042		case 'D':
1043			Dflag++;
1044			break;
1045		case 'd':
1046			dflag++;
1047			break;
1048		case 'f':
1049			configfile = optarg;
1050			break;
1051		case 'n':
1052			nflag++;
1053			break;
1054		default:
1055			usage();
1056		}
1057	}
1058
1059	cfg.parse();
1060	if (!dflag && nflag) {
1061		cfg.open_pidfile();
1062		daemon(0, 0);
1063		cfg.write_pidfile();
1064	}
1065	signal(SIGPIPE, SIG_IGN);
1066	signal(SIGHUP, gensighand);
1067	signal(SIGINT, gensighand);
1068	signal(SIGTERM, gensighand);
1069	event_loop();
1070	return (0);
1071}
1072