devd.cc revision 155073 
1/*-
2 * Copyright (c) 2002-2003 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
27/*
28 * DEVD control daemon.
29 */
30
31// TODO list:
32//	o devd.conf and devd man pages need a lot of help:
33//	  - devd needs to document the unix domain socket
34//	  - devd.conf needs more details on the supported statements.
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sbin/devd/devd.cc 155073 2006-01-30 22:50:13Z pjd $");
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 <ctype.h>
47#include <dirent.h>
48#include <errno.h>
49#include <err.h>
50#include <fcntl.h>
51#include <libutil.h>
52#include <regex.h>
53#include <signal.h>
54#include <stdlib.h>
55#include <stdio.h>
56#include <string.h>
57#include <unistd.h>
58
59#include <algorithm>
60#include <map>
61#include <string>
62#include <list>
63#include <vector>
64
65#include "devd.h"		/* C compatible definitions */
66#include "devd.hh"		/* C++ class definitions */
67
68#define PIPE "/var/run/devd.pipe"
69#define CF "/etc/devd.conf"
70#define SYSCTL "hw.bus.devctl_disable"
71
72using namespace std;
73
74extern FILE *yyin;
75extern int lineno;
76
77static const char notify = '!';
78static const char nomatch = '?';
79static const char attach = '+';
80static const char detach = '-';
81
82static struct pidfh *pfh;
83
84int Dflag;
85int dflag;
86int nflag;
87int romeo_must_die = 0;
88
89static const char *configfile = CF;
90
91static void event_loop(void);
92static void usage(void);
93
94template <class T> void
95delete_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
104config cfg;
105
106event_proc::event_proc() : _prio(-1)
107{
108	// nothing
109}
110
111event_proc::~event_proc()
112{
113	delete_and_clear(_epsvec);
114}
115
116void
117event_proc::add(eps *eps)
118{
119	_epsvec.push_back(eps);
120}
121
122bool
123event_proc::matches(config &c)
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
133bool
134event_proc::run(config &c)
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
144action::action(const char *cmd)
145	: _cmd(cmd)
146{
147	// nothing
148}
149
150action::~action()
151{
152	// nothing
153}
154
155bool
156action::do_action(config &c)
157{
158	string s = c.expand_string(_cmd);
159	if (Dflag)
160		fprintf(stderr, "Executing '%s'\n", s.c_str());
161	::system(s.c_str());
162	return (true);
163}
164
165match::match(config &c, const char *var, const char *re)
166	: _var(var)
167{
168	string pattern = re;
169	_re = "^";
170	_re.append(c.expand_string(string(re)));
171	_re.append("$");
172	regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
173}
174
175match::~match()
176{
177	regfree(&_regex);
178}
179
180bool
181match::do_match(config &c)
182{
183	string value = c.get_variable(_var);
184	bool retval;
185
186	if (Dflag)
187		fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
188		    value.c_str(), _re.c_str());
189
190	retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
191	return retval;
192}
193
194#include <sys/sockio.h>
195#include <net/if.h>
196#include <net/if_media.h>
197
198media::media(config &, const char *var, const char *type)
199	: _var(var), _type(-1)
200{
201	static struct ifmedia_description media_types[] = {
202		{ IFM_ETHER,		"Ethernet" },
203		{ IFM_TOKEN,		"Tokenring" },
204		{ IFM_FDDI,		"FDDI" },
205		{ IFM_IEEE80211,	"802.11" },
206		{ IFM_ATM,		"ATM" },
207		{ IFM_CARP,		"CARP" },
208		{ -1,			"unknown" },
209		{ 0, NULL },
210	};
211	for (int i = 0; media_types[i].ifmt_string != NULL; i++)
212		if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
213			_type = media_types[i].ifmt_word;
214			break;
215		}
216}
217
218media::~media()
219{
220}
221
222bool
223media::do_match(config &c)
224{
225	string value;
226	struct ifmediareq ifmr;
227	bool retval;
228	int s;
229
230	// Since we can be called from both a device attach/detach
231	// context where device-name is defined and what we want,
232	// as well as from a link status context, where subsystem is
233	// the name of interest, first try device-name and fall back
234	// to subsystem if none exists.
235	value = c.get_variable("device-name");
236	if (value.length() == 0)
237		value = c.get_variable("subsystem");
238	if (Dflag)
239		fprintf(stderr, "Testing media type of %s against 0x%x\n",
240		    value.c_str(), _type);
241
242	retval = false;
243
244	s = socket(PF_INET, SOCK_DGRAM, 0);
245	if (s >= 0) {
246		memset(&ifmr, 0, sizeof(ifmr));
247		strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
248
249		if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
250		    ifmr.ifm_status & IFM_AVALID) {
251			if (Dflag)
252				fprintf(stderr, "%s has media type 0x%x\n",
253				    value.c_str(), IFM_TYPE(ifmr.ifm_active));
254			retval = (IFM_TYPE(ifmr.ifm_active) == _type);
255		} else if (_type == -1) {
256			if (Dflag)
257				fprintf(stderr, "%s has unknown media type\n",
258				    value.c_str());
259			retval = true;
260		}
261		close(s);
262	}
263
264	return retval;
265}
266
267const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
268const string var_list::nothing = "";
269
270const string &
271var_list::get_variable(const string &var) const
272{
273	map<string, string>::const_iterator i;
274
275	i = _vars.find(var);
276	if (i == _vars.end())
277		return (var_list::bogus);
278	return (i->second);
279}
280
281bool
282var_list::is_set(const string &var) const
283{
284	return (_vars.find(var) != _vars.end());
285}
286
287void
288var_list::set_variable(const string &var, const string &val)
289{
290	if (Dflag)
291		fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
292	_vars[var] = val;
293}
294
295void
296config::reset(void)
297{
298	_dir_list.clear();
299	delete_and_clear(_var_list_table);
300	delete_and_clear(_attach_list);
301	delete_and_clear(_detach_list);
302	delete_and_clear(_nomatch_list);
303	delete_and_clear(_notify_list);
304}
305
306void
307config::parse_one_file(const char *fn)
308{
309	if (Dflag)
310		printf("Parsing %s\n", fn);
311	yyin = fopen(fn, "r");
312	if (yyin == NULL)
313		err(1, "Cannot open config file %s", fn);
314	if (yyparse() != 0)
315		errx(1, "Cannot parse %s at line %d", fn, lineno);
316	fclose(yyin);
317}
318
319void
320config::parse_files_in_dir(const char *dirname)
321{
322	DIR *dirp;
323	struct dirent *dp;
324	char path[PATH_MAX];
325
326	if (Dflag)
327		printf("Parsing files in %s\n", dirname);
328	dirp = opendir(dirname);
329	if (dirp == NULL)
330		return;
331	readdir(dirp);		/* Skip . */
332	readdir(dirp);		/* Skip .. */
333	while ((dp = readdir(dirp)) != NULL) {
334		if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
335			snprintf(path, sizeof(path), "%s/%s",
336			    dirname, dp->d_name);
337			parse_one_file(path);
338		}
339	}
340}
341
342class epv_greater {
343public:
344	int operator()(event_proc *const&l1, event_proc *const&l2)
345	{
346		return (l1->get_priority() > l2->get_priority());
347	}
348};
349
350void
351config::sort_vector(vector<event_proc *> &v)
352{
353	sort(v.begin(), v.end(), epv_greater());
354}
355
356void
357config::parse(void)
358{
359	vector<string>::const_iterator i;
360
361	parse_one_file(configfile);
362	for (i = _dir_list.begin(); i != _dir_list.end(); i++)
363		parse_files_in_dir((*i).c_str());
364	sort_vector(_attach_list);
365	sort_vector(_detach_list);
366	sort_vector(_nomatch_list);
367	sort_vector(_notify_list);
368}
369
370void
371config::open_pidfile()
372{
373	pid_t otherpid;
374
375	if (_pidfile == "")
376		return;
377	pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
378	if (pfh == NULL) {
379		if (errno == EEXIST)
380			errx(1, "devd already running, pid: %d", (int)otherpid);
381		warn("cannot open pid file");
382	}
383}
384
385void
386config::write_pidfile()
387{
388
389	pidfile_write(pfh);
390}
391
392void
393config::remove_pidfile()
394{
395
396	pidfile_remove(pfh);
397}
398
399void
400config::add_attach(int prio, event_proc *p)
401{
402	p->set_priority(prio);
403	_attach_list.push_back(p);
404}
405
406void
407config::add_detach(int prio, event_proc *p)
408{
409	p->set_priority(prio);
410	_detach_list.push_back(p);
411}
412
413void
414config::add_directory(const char *dir)
415{
416	_dir_list.push_back(string(dir));
417}
418
419void
420config::add_nomatch(int prio, event_proc *p)
421{
422	p->set_priority(prio);
423	_nomatch_list.push_back(p);
424}
425
426void
427config::add_notify(int prio, event_proc *p)
428{
429	p->set_priority(prio);
430	_notify_list.push_back(p);
431}
432
433void
434config::set_pidfile(const char *fn)
435{
436	_pidfile = string(fn);
437}
438
439void
440config::push_var_table()
441{
442	var_list *vl;
443
444	vl = new var_list();
445	_var_list_table.push_back(vl);
446	if (Dflag)
447		fprintf(stderr, "Pushing table\n");
448}
449
450void
451config::pop_var_table()
452{
453	delete _var_list_table.back();
454	_var_list_table.pop_back();
455	if (Dflag)
456		fprintf(stderr, "Popping table\n");
457}
458
459void
460config::set_variable(const char *var, const char *val)
461{
462	_var_list_table.back()->set_variable(var, val);
463}
464
465const string &
466config::get_variable(const string &var)
467{
468	vector<var_list *>::reverse_iterator i;
469
470	for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
471		if ((*i)->is_set(var))
472			return ((*i)->get_variable(var));
473	}
474	return (var_list::nothing);
475}
476
477bool
478config::is_id_char(char ch)
479{
480	return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
481	    ch == '-'));
482}
483
484void
485config::expand_one(const char *&src, string &dst)
486{
487	int count;
488	string buffer, varstr;
489
490	src++;
491	// $$ -> $
492	if (*src == '$') {
493		dst.append(src++, 1);
494		return;
495	}
496
497	// $(foo) -> $(foo)
498	// Not sure if I want to support this or not, so for now we just pass
499	// it through.
500	if (*src == '(') {
501		dst.append("$");
502		count = 1;
503		/* If the string ends before ) is matched , return. */
504		while (count > 0 && *src) {
505			if (*src == ')')
506				count--;
507			else if (*src == '(')
508				count++;
509			dst.append(src++, 1);
510		}
511		return;
512	}
513
514	// ${^A-Za-z] -> $\1
515	if (!isalpha(*src)) {
516		dst.append("$");
517		dst.append(src++, 1);
518		return;
519	}
520
521	// $var -> replace with value
522	do {
523		buffer.append(src++, 1);
524	} while (is_id_char(*src));
525	buffer.append("", 1);
526	varstr = get_variable(buffer.c_str());
527	dst.append(varstr);
528}
529
530const string
531config::expand_string(const string &s)
532{
533	const char *src;
534	string dst;
535
536	src = s.c_str();
537	while (*src) {
538		if (*src == '$')
539			expand_one(src, dst);
540		else
541			dst.append(src++, 1);
542	}
543	dst.append("", 1);
544
545	return (dst);
546}
547
548bool
549config::chop_var(char *&buffer, char *&lhs, char *&rhs)
550{
551	char *walker;
552
553	if (*buffer == '\0')
554		return (false);
555	walker = lhs = buffer;
556	while (is_id_char(*walker))
557		walker++;
558	if (*walker != '=')
559		return (false);
560	walker++;		// skip =
561	if (*walker == '"') {
562		walker++;	// skip "
563		rhs = walker;
564		while (*walker && *walker != '"')
565			walker++;
566		if (*walker != '"')
567			return (false);
568		rhs[-2] = '\0';
569		*walker++ = '\0';
570	} else {
571		rhs = walker;
572		while (*walker && !isspace(*walker))
573			walker++;
574		if (*walker != '\0')
575			*walker++ = '\0';
576		rhs[-1] = '\0';
577	}
578	while (isspace(*walker))
579		walker++;
580	buffer = walker;
581	return (true);
582}
583
584
585char *
586config::set_vars(char *buffer)
587{
588	char *lhs;
589	char *rhs;
590
591	while (1) {
592		if (!chop_var(buffer, lhs, rhs))
593			break;
594		set_variable(lhs, rhs);
595	}
596	return (buffer);
597}
598
599void
600config::find_and_execute(char type)
601{
602	vector<event_proc *> *l;
603	vector<event_proc *>::const_iterator i;
604	const char *s;
605
606	switch (type) {
607	default:
608		return;
609	case notify:
610		l = &_notify_list;
611		s = "notify";
612		break;
613	case nomatch:
614		l = &_nomatch_list;
615		s = "nomatch";
616		break;
617	case attach:
618		l = &_attach_list;
619		s = "attach";
620		break;
621	case detach:
622		l = &_detach_list;
623		s = "detach";
624		break;
625	}
626	if (Dflag)
627		fprintf(stderr, "Processing %s event\n", s);
628	for (i = l->begin(); i != l->end(); i++) {
629		if ((*i)->matches(*this)) {
630			(*i)->run(*this);
631			break;
632		}
633	}
634
635}
636
637
638static void
639process_event(char *buffer)
640{
641	char type;
642	char *sp;
643
644	sp = buffer + 1;
645	if (Dflag)
646		fprintf(stderr, "Processing event '%s'\n", buffer);
647	type = *buffer++;
648	cfg.push_var_table();
649	// No match doesn't have a device, and the format is a little
650	// different, so handle it separately.
651	switch (type) {
652	case notify:
653		sp = cfg.set_vars(sp);
654		break;
655	case nomatch:
656		//? at location pnp-info on bus
657		sp = strchr(sp, ' ');
658		if (sp == NULL)
659			return;	/* Can't happen? */
660		*sp++ = '\0';
661		if (strncmp(sp, "at ", 3) == 0)
662			sp += 3;
663		sp = cfg.set_vars(sp);
664		if (strncmp(sp, "on ", 3) == 0)
665			cfg.set_variable("bus", sp + 3);
666		break;
667	case attach:	/*FALLTHROUGH*/
668	case detach:
669		sp = strchr(sp, ' ');
670		if (sp == NULL)
671			return;	/* Can't happen? */
672		*sp++ = '\0';
673		cfg.set_variable("device-name", buffer);
674		if (strncmp(sp, "at ", 3) == 0)
675			sp += 3;
676		sp = cfg.set_vars(sp);
677		if (strncmp(sp, "on ", 3) == 0)
678			cfg.set_variable("bus", sp + 3);
679		break;
680	}
681
682	cfg.find_and_execute(type);
683	cfg.pop_var_table();
684}
685
686int
687create_socket(const char *name)
688{
689	int fd, slen;
690	struct sockaddr_un sun;
691
692	if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
693		err(1, "socket");
694	bzero(&sun, sizeof(sun));
695	sun.sun_family = AF_UNIX;
696	strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
697	slen = SUN_LEN(&sun);
698	unlink(name);
699	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
700	    	err(1, "fcntl");
701	if (bind(fd, (struct sockaddr *) & sun, slen) < 0)
702		err(1, "bind");
703	listen(fd, 4);
704	chown(name, 0, 0);	/* XXX - root.wheel */
705	chmod(name, 0666);
706	return (fd);
707}
708
709list<int> clients;
710
711void
712notify_clients(const char *data, int len)
713{
714	list<int> bad;
715	list<int>::const_iterator i;
716
717	for (i = clients.begin(); i != clients.end(); i++) {
718		if (write(*i, data, len) <= 0) {
719			bad.push_back(*i);
720			close(*i);
721		}
722	}
723
724	for (i = bad.begin(); i != bad.end(); i++)
725		clients.erase(find(clients.begin(), clients.end(), *i));
726}
727
728void
729new_client(int fd)
730{
731	int s;
732
733	s = accept(fd, NULL, NULL);
734	if (s != -1)
735		clients.push_back(s);
736}
737
738static void
739event_loop(void)
740{
741	int rv;
742	int fd;
743	char buffer[DEVCTL_MAXBUF];
744	int once = 0;
745	int server_fd, max_fd;
746	timeval tv;
747	fd_set fds;
748
749	fd = open(PATH_DEVCTL, O_RDONLY);
750	if (fd == -1)
751		err(1, "Can't open devctl device %s", PATH_DEVCTL);
752	if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
753		err(1, "Can't set close-on-exec flag on devctl");
754	server_fd = create_socket(PIPE);
755	max_fd = max(fd, server_fd) + 1;
756	while (1) {
757		if (romeo_must_die)
758			break;
759		if (!once && !dflag && !nflag) {
760			// Check to see if we have any events pending.
761			tv.tv_sec = 0;
762			tv.tv_usec = 0;
763			FD_ZERO(&fds);
764			FD_SET(fd, &fds);
765			rv = select(fd + 1, &fds, &fds, &fds, &tv);
766			// No events -> we've processed all pending events
767			if (rv == 0) {
768				if (Dflag)
769					fprintf(stderr, "Calling daemon\n");
770				cfg.remove_pidfile();
771				cfg.open_pidfile();
772				daemon(0, 0);
773				cfg.write_pidfile();
774				once++;
775			}
776		}
777		FD_ZERO(&fds);
778		FD_SET(fd, &fds);
779		FD_SET(server_fd, &fds);
780		rv = select(max_fd, &fds, NULL, NULL, NULL);
781		if (rv == -1) {
782			if (errno == EINTR)
783				continue;
784			err(1, "select");
785		}
786		if (FD_ISSET(fd, &fds)) {
787			rv = read(fd, buffer, sizeof(buffer) - 1);
788			if (rv > 0) {
789				notify_clients(buffer, rv);
790				buffer[rv] = '\0';
791				while (buffer[--rv] == '\n')
792					buffer[rv] = '\0';
793				process_event(buffer);
794			} else if (rv < 0) {
795				if (errno != EINTR)
796					break;
797			} else {
798				/* EOF */
799				break;
800			}
801		}
802		if (FD_ISSET(server_fd, &fds))
803			new_client(server_fd);
804	}
805	close(fd);
806}
807
808/*
809 * functions that the parser uses.
810 */
811void
812add_attach(int prio, event_proc *p)
813{
814	cfg.add_attach(prio, p);
815}
816
817void
818add_detach(int prio, event_proc *p)
819{
820	cfg.add_detach(prio, p);
821}
822
823void
824add_directory(const char *dir)
825{
826	cfg.add_directory(dir);
827	free(const_cast<char *>(dir));
828}
829
830void
831add_nomatch(int prio, event_proc *p)
832{
833	cfg.add_nomatch(prio, p);
834}
835
836void
837add_notify(int prio, event_proc *p)
838{
839	cfg.add_notify(prio, p);
840}
841
842event_proc *
843add_to_event_proc(event_proc *ep, eps *eps)
844{
845	if (ep == NULL)
846		ep = new event_proc();
847	ep->add(eps);
848	return (ep);
849}
850
851eps *
852new_action(const char *cmd)
853{
854	eps *e = new action(cmd);
855	free(const_cast<char *>(cmd));
856	return (e);
857}
858
859eps *
860new_match(const char *var, const char *re)
861{
862	eps *e = new match(cfg, var, re);
863	free(const_cast<char *>(var));
864	free(const_cast<char *>(re));
865	return (e);
866}
867
868eps *
869new_media(const char *var, const char *re)
870{
871	eps *e = new media(cfg, var, re);
872	free(const_cast<char *>(var));
873	free(const_cast<char *>(re));
874	return (e);
875}
876
877void
878set_pidfile(const char *name)
879{
880	cfg.set_pidfile(name);
881	free(const_cast<char *>(name));
882}
883
884void
885set_variable(const char *var, const char *val)
886{
887	cfg.set_variable(var, val);
888	free(const_cast<char *>(var));
889	free(const_cast<char *>(val));
890}
891
892
893
894static void
895gensighand(int)
896{
897	romeo_must_die++;
898	_exit(0);
899}
900
901static void
902usage()
903{
904	fprintf(stderr, "usage: %s [-Ddn]\n", getprogname());
905	exit(1);
906}
907
908static void
909check_devd_enabled()
910{
911	int val = 0;
912	size_t len;
913
914	len = sizeof(val);
915	if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
916		errx(1, "devctl sysctl missing from kernel!");
917	if (val) {
918		warnx("Setting " SYSCTL " to 0");
919		val = 0;
920		sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
921	}
922}
923
924/*
925 * main
926 */
927int
928main(int argc, char **argv)
929{
930	int ch;
931
932	check_devd_enabled();
933	while ((ch = getopt(argc, argv, "Ddf:n")) != -1) {
934		switch (ch) {
935		case 'D':
936			Dflag++;
937			break;
938		case 'd':
939			dflag++;
940			break;
941		case 'f':
942			configfile = optarg;
943			break;
944		case 'n':
945			nflag++;
946			break;
947		default:
948			usage();
949		}
950	}
951
952	cfg.parse();
953	if (!dflag && nflag) {
954		cfg.open_pidfile();
955		daemon(0, 0);
956		cfg.write_pidfile();
957	}
958	signal(SIGPIPE, SIG_IGN);
959	signal(SIGHUP, gensighand);
960	signal(SIGINT, gensighand);
961	signal(SIGTERM, gensighand);
962	event_loop();
963	return (0);
964}
965