1/*	$OpenBSD: parse.y,v 1.8 2021/10/15 15:01:28 naddy Exp $	*/
2
3/*
4 * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
5 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
6 * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
7 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
8 * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
9 * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
10 *
11 * Permission to use, copy, modify, and distribute this software for any
12 * purpose with or without fee is hereby granted, provided that the above
13 * copyright notice and this permission notice appear in all copies.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 */
23
24%{
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <sys/stat.h>
28#include <sys/ioctl.h>
29#include <sys/un.h>
30
31#include <net/if.h>
32#include <netinet/in.h>
33#include <arpa/inet.h>
34
35#include <ctype.h>
36#include <err.h>
37#include <errno.h>
38#include <ifaddrs.h>
39#include <inttypes.h>
40#include <limits.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <unistd.h>
44
45#include "lpd.h"
46
47#include "log.h"
48
49TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
50static struct file {
51	TAILQ_ENTRY(file)	 entry;
52	FILE			*stream;
53	char			*name;
54	int			 lineno;
55	int			 errors;
56} *file, *topfile;
57struct file	*pushfile(const char *, int);
58int		 popfile(void);
59int		 check_file_secrecy(int, const char *);
60int		 yyparse(void);
61int		 yylex(void);
62int		 kw_cmp(const void *, const void *);
63int		 lookup(char *);
64int		 lgetc(int);
65int		 lungetc(int);
66int		 findeol(void);
67int		 yyerror(const char *, ...)
68    __attribute__((__format__ (printf, 1, 2)))
69    __attribute__((__nonnull__ (1)));
70
71TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
72struct sym {
73	TAILQ_ENTRY(sym)	 entry;
74	int			 used;
75	int			 persist;
76	char			*nam;
77	char			*val;
78};
79int		 symset(const char *, const char *, int);
80char		*symget(const char *);
81
82static int		 errors = 0;
83
84struct lpd_conf		*conf = NULL;
85
86enum listen_options {
87	LO_FAMILY	= 0x000001,
88	LO_PORT		= 0x000002,
89};
90
91static struct listen_opts {
92	char	       *ifx;
93	int		family;
94	int		proto;
95	in_port_t	port;
96	uint32_t       	options;
97} listen_opts;
98
99static void	config_free(struct lpd_conf *);
100static void	create_listeners(struct listen_opts *);
101static void	config_listener(struct listener *, struct listen_opts *);
102static int	local(struct listen_opts *);
103static int	host_v4(struct listen_opts *);
104static int	host_v6(struct listen_opts *);
105static int	host_dns(struct listen_opts *);
106static int	interface(struct listen_opts *);
107static int	is_if_in_group(const char *, const char *);
108
109typedef struct {
110	union {
111		int64_t		 number;
112		char		*string;
113		struct host	*host;
114	} v;
115	int lineno;
116} YYSTYPE;
117
118%}
119
120%token	ERROR ARROW INCLUDE
121%token	LISTEN ON PORT INET4 INET6 LOCAL SOCKET
122%token	<v.string>	STRING
123%token  <v.number>	NUMBER
124%type	<v.number>	family_inet portno
125
126%%
127
128grammar		: /* empty */
129		| grammar '\n'
130		| grammar include '\n'
131		| grammar varset '\n'
132		| grammar main '\n'
133		| grammar error '\n'		{ file->errors++; }
134		;
135
136include		: INCLUDE STRING		{
137			struct file	*nfile;
138
139			if ((nfile = pushfile($2, 0)) == NULL) {
140				yyerror("failed to include file %s", $2);
141				free($2);
142				YYERROR;
143			}
144			free($2);
145
146			file = nfile;
147			lungetc('\n');
148		}
149		;
150
151varset		: STRING '=' STRING		{
152			char *s = $1;
153			while (*s++) {
154				if (isspace((unsigned char)*s)) {
155					yyerror("macro name cannot contain "
156					    "whitespace");
157					free($1);
158					free($3);
159					YYERROR;
160				}
161			}
162			if (symset($1, $3, 0) == -1)
163				fatal("cannot store variable");
164			free($1);
165			free($3);
166		}
167		;
168
169portno		: STRING {
170			struct servent	*servent;
171			servent = getservbyname($1, "tcp");
172			if (servent == NULL) {
173				yyerror("invalid port: %s", $1);
174				free($1);
175				YYERROR;
176			}
177			free($1);
178			$$ = ntohs(servent->s_port);
179		}
180		| NUMBER {
181			if ($1 <= 0 || $1 > (int)USHRT_MAX) {
182				yyerror("invalid port: %" PRId64, $1);
183				YYERROR;
184			}
185			$$ = $1;
186		}
187		;
188
189family_inet	: INET4 { $$ = AF_INET; }
190		| INET6 { $$ = AF_INET6; }
191		;
192
193opt_listen	: family_inet {
194			if (listen_opts.options & LO_FAMILY) {
195				yyerror("address family already specified");
196				YYERROR;
197			}
198			listen_opts.options |= LO_FAMILY;
199			listen_opts.family = $1;
200		}
201		| PORT portno {
202			if (listen_opts.options & LO_PORT) {
203				yyerror("port already specified");
204				YYERROR;
205			}
206			listen_opts.options |= LO_PORT;
207			listen_opts.port = htons($2);
208		}
209		;
210
211listener	: opt_listen listener
212		| /* empty */ {
213			create_listeners(&listen_opts);
214		}
215		;
216
217main		: LISTEN ON STRING {
218			memset(&listen_opts, 0, sizeof listen_opts);
219			listen_opts.ifx = $3;
220			listen_opts.family = AF_UNSPEC;
221			listen_opts.proto = PROTO_LPR;
222			listen_opts.port = htons(PORT_LPR);
223		} listener
224		;
225%%
226
227struct keywords {
228	const char	*k_name;
229	int		 k_val;
230};
231
232int
233yyerror(const char *fmt, ...)
234{
235	va_list		 ap;
236	char		*msg;
237
238	file->errors++;
239	va_start(ap, fmt);
240	if (vasprintf(&msg, fmt, ap) == -1)
241		fatalx("yyerror vasprintf");
242	va_end(ap);
243	log_warnx("%s:%d: %s", file->name, yylval.lineno, msg);
244	free(msg);
245	return (0);
246}
247
248int
249kw_cmp(const void *k, const void *e)
250{
251	return (strcmp(k, ((const struct keywords *)e)->k_name));
252}
253
254int
255lookup(char *s)
256{
257	/* this has to be sorted always */
258	static const struct keywords keywords[] = {
259		{ "include",		INCLUDE },
260		{ "inet4",		INET4 },
261		{ "inet6",		INET6 },
262		{ "listen",		LISTEN },
263		{ "on",			ON },
264		{ "port",		PORT },
265		{ "socket",		SOCKET },
266	};
267	const struct keywords	*p;
268
269	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
270	    sizeof(keywords[0]), kw_cmp);
271
272	if (p)
273		return (p->k_val);
274	else
275		return (STRING);
276}
277
278#define MAXPUSHBACK	128
279
280char	*parsebuf;
281int	 parseindex;
282char	 pushback_buffer[MAXPUSHBACK];
283int	 pushback_index = 0;
284
285int
286lgetc(int quotec)
287{
288	int		c, next;
289
290	if (parsebuf) {
291		/* Read character from the parsebuffer instead of input. */
292		if (parseindex >= 0) {
293			c = (unsigned char)parsebuf[parseindex++];
294			if (c != '\0')
295				return (c);
296			parsebuf = NULL;
297		} else
298			parseindex++;
299	}
300
301	if (pushback_index)
302		return ((unsigned char)pushback_buffer[--pushback_index]);
303
304	if (quotec) {
305		if ((c = getc(file->stream)) == EOF) {
306			yyerror("reached end of file while parsing "
307			    "quoted string");
308			if (file == topfile || popfile() == EOF)
309				return (EOF);
310			return (quotec);
311		}
312		return (c);
313	}
314
315	while ((c = getc(file->stream)) == '\\') {
316		next = getc(file->stream);
317		if (next != '\n') {
318			c = next;
319			break;
320		}
321		yylval.lineno = file->lineno;
322		file->lineno++;
323	}
324
325	while (c == EOF) {
326		if (file == topfile || popfile() == EOF)
327			return (EOF);
328		c = getc(file->stream);
329	}
330	return (c);
331}
332
333int
334lungetc(int c)
335{
336	if (c == EOF)
337		return (EOF);
338	if (parsebuf) {
339		parseindex--;
340		if (parseindex >= 0)
341			return (c);
342	}
343	if (pushback_index + 1 >= MAXPUSHBACK)
344		return (EOF);
345	pushback_buffer[pushback_index++] = c;
346	return (c);
347}
348
349int
350findeol(void)
351{
352	int	c;
353
354	parsebuf = NULL;
355	pushback_index = 0;
356
357	/* skip to either EOF or the first real EOL */
358	while (1) {
359		c = lgetc(0);
360		if (c == '\n') {
361			file->lineno++;
362			break;
363		}
364		if (c == EOF)
365			break;
366	}
367	return (ERROR);
368}
369
370int
371yylex(void)
372{
373	char	 buf[8096];
374	char	*p, *val;
375	int	 quotec, next, c;
376	int	 token;
377
378top:
379	p = buf;
380	while ((c = lgetc(0)) == ' ' || c == '\t')
381		; /* nothing */
382
383	yylval.lineno = file->lineno;
384	if (c == '#')
385		while ((c = lgetc(0)) != '\n' && c != EOF)
386			; /* nothing */
387	if (c == '$' && parsebuf == NULL) {
388		while (1) {
389			if ((c = lgetc(0)) == EOF)
390				return (0);
391
392			if (p + 1 >= buf + sizeof(buf) - 1) {
393				yyerror("string too long");
394				return (findeol());
395			}
396			if (isalnum(c) || c == '_') {
397				*p++ = c;
398				continue;
399			}
400			*p = '\0';
401			lungetc(c);
402			break;
403		}
404		val = symget(buf);
405		if (val == NULL) {
406			yyerror("macro '%s' not defined", buf);
407			return (findeol());
408		}
409		parsebuf = val;
410		parseindex = 0;
411		goto top;
412	}
413
414	switch (c) {
415	case '\'':
416	case '"':
417		quotec = c;
418		while (1) {
419			if ((c = lgetc(quotec)) == EOF)
420				return (0);
421			if (c == '\n') {
422				file->lineno++;
423				continue;
424			} else if (c == '\\') {
425				if ((next = lgetc(quotec)) == EOF)
426					return (0);
427				if (next == quotec || next == ' ' ||
428				    next == '\t')
429					c = next;
430				else if (next == '\n') {
431					file->lineno++;
432					continue;
433				} else
434					lungetc(next);
435			} else if (c == quotec) {
436				*p = '\0';
437				break;
438			} else if (c == '\0') {
439				yyerror("syntax error");
440				return (findeol());
441			}
442			if (p + 1 >= buf + sizeof(buf) - 1) {
443				yyerror("string too long");
444				return (findeol());
445			}
446			*p++ = c;
447		}
448		yylval.v.string = strdup(buf);
449		if (yylval.v.string == NULL)
450			err(1, "%s", __func__);
451		return (STRING);
452	}
453
454#define allowed_to_end_number(x) \
455	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
456
457	if (c == '-' || isdigit(c)) {
458		do {
459			*p++ = c;
460			if ((size_t)(p-buf) >= sizeof(buf)) {
461				yyerror("string too long");
462				return (findeol());
463			}
464		} while ((c = lgetc(0)) != EOF && isdigit(c));
465		lungetc(c);
466		if (p == buf + 1 && buf[0] == '-')
467			goto nodigits;
468		if (c == EOF || allowed_to_end_number(c)) {
469			const char *errstr = NULL;
470
471			*p = '\0';
472			yylval.v.number = strtonum(buf, LLONG_MIN,
473			    LLONG_MAX, &errstr);
474			if (errstr) {
475				yyerror("\"%s\" invalid number: %s",
476				    buf, errstr);
477				return (findeol());
478			}
479			return (NUMBER);
480		} else {
481nodigits:
482			while (p > buf + 1)
483				lungetc((unsigned char)*--p);
484			c = (unsigned char)*--p;
485			if (c == '-')
486				return (c);
487		}
488	}
489
490	if (c == '=') {
491		if ((c = lgetc(0)) != EOF && c == '>')
492			return (ARROW);
493		lungetc(c);
494		c = '=';
495	}
496
497#define allowed_in_string(x) \
498	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
499	x != '{' && x != '}' && x != '<' && x != '>' && \
500	x != '!' && x != '=' && x != '#' && \
501	x != ','))
502
503	if (isalnum(c) || c == ':' || c == '_') {
504		do {
505			*p++ = c;
506			if ((size_t)(p-buf) >= sizeof(buf)) {
507				yyerror("string too long");
508				return (findeol());
509			}
510		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
511		lungetc(c);
512		*p = '\0';
513		if ((token = lookup(buf)) == STRING)
514			if ((yylval.v.string = strdup(buf)) == NULL)
515				err(1, "%s", __func__);
516		return (token);
517	}
518	if (c == '\n') {
519		yylval.lineno = file->lineno;
520		file->lineno++;
521	}
522	if (c == EOF)
523		return (0);
524	return (c);
525}
526
527int
528check_file_secrecy(int fd, const char *fname)
529{
530	struct stat	st;
531
532	if (fstat(fd, &st)) {
533		log_warn("warn: cannot stat %s", fname);
534		return (-1);
535	}
536	if (st.st_uid != 0 && st.st_uid != getuid()) {
537		log_warnx("warn: %s: owner not root or current user", fname);
538		return (-1);
539	}
540	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
541		log_warnx("warn: %s: group/world readable/writeable", fname);
542		return (-1);
543	}
544	return (0);
545}
546
547struct file *
548pushfile(const char *name, int secret)
549{
550	struct file	*nfile;
551
552	if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
553		log_warn("%s", __func__);
554		return (NULL);
555	}
556	if ((nfile->name = strdup(name)) == NULL) {
557		log_warn("%s", __func__);
558		free(nfile);
559		return (NULL);
560	}
561	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
562		log_warn("%s: %s", __func__, nfile->name);
563		free(nfile->name);
564		free(nfile);
565		return (NULL);
566	} else if (secret &&
567	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
568		fclose(nfile->stream);
569		free(nfile->name);
570		free(nfile);
571		return (NULL);
572	}
573	nfile->lineno = 1;
574	TAILQ_INSERT_TAIL(&files, nfile, entry);
575	return (nfile);
576}
577
578int
579popfile(void)
580{
581	struct file	*prev;
582
583	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
584		prev->errors += file->errors;
585
586	TAILQ_REMOVE(&files, file, entry);
587	fclose(file->stream);
588	free(file->name);
589	free(file);
590	file = prev;
591	return (file ? 0 : EOF);
592}
593
594struct lpd_conf *
595parse_config(const char *filename, int verbose)
596{
597	struct sym     *sym, *next;
598
599	conf = calloc(1, sizeof(*conf));
600	if (conf == NULL)
601		return NULL;
602	TAILQ_INIT(&conf->listeners);
603
604	errors = 0;
605
606	if ((file = pushfile(filename, 0)) == NULL) {
607		config_free(conf);
608		return NULL;
609	}
610	topfile = file;
611
612	/*
613	 * parse configuration
614	 */
615	setservent(1);
616	yyparse();
617	errors = file->errors;
618	popfile();
619	endservent();
620
621	/* Free macros and check which have not been used. */
622	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
623		if ((verbose) && !sym->used)
624			log_warnx("warning: macro '%s' not used\n", sym->nam);
625		if (!sym->persist) {
626			free(sym->nam);
627			free(sym->val);
628			TAILQ_REMOVE(&symhead, sym, entry);
629			free(sym);
630		}
631	}
632
633	if (errors) {
634		config_free(conf);
635		return NULL;
636	}
637
638	return conf;
639}
640
641int
642symset(const char *nam, const char *val, int persist)
643{
644	struct sym	*sym;
645
646	TAILQ_FOREACH(sym, &symhead, entry) {
647		if (strcmp(nam, sym->nam) == 0)
648			break;
649	}
650
651	if (sym != NULL) {
652		if (sym->persist == 1)
653			return (0);
654		else {
655			free(sym->nam);
656			free(sym->val);
657			TAILQ_REMOVE(&symhead, sym, entry);
658			free(sym);
659		}
660	}
661	if ((sym = calloc(1, sizeof(*sym))) == NULL)
662		return (-1);
663
664	sym->nam = strdup(nam);
665	if (sym->nam == NULL) {
666		free(sym);
667		return (-1);
668	}
669	sym->val = strdup(val);
670	if (sym->val == NULL) {
671		free(sym->nam);
672		free(sym);
673		return (-1);
674	}
675	sym->used = 0;
676	sym->persist = persist;
677	TAILQ_INSERT_TAIL(&symhead, sym, entry);
678	return (0);
679}
680
681int
682cmdline_symset(char *s)
683{
684	char	*sym, *val;
685	int	ret;
686
687	if ((val = strrchr(s, '=')) == NULL)
688		return (-1);
689	sym = strndup(s, val - s);
690	if (sym == NULL)
691		errx(1, "%s: strndup", __func__);
692	ret = symset(sym, val + 1, 1);
693	free(sym);
694
695	return (ret);
696}
697
698char *
699symget(const char *nam)
700{
701	struct sym	*sym;
702
703	TAILQ_FOREACH(sym, &symhead, entry) {
704		if (strcmp(nam, sym->nam) == 0) {
705			sym->used = 1;
706			return (sym->val);
707		}
708	}
709	return (NULL);
710}
711
712static void
713config_free(struct lpd_conf *c)
714{
715	struct listener *l;
716
717	while ((l = TAILQ_FIRST(&c->listeners))) {
718		TAILQ_REMOVE(&c->listeners, l, entry);
719		free(l);
720	}
721	free(c);
722}
723
724static void
725create_listeners(struct listen_opts *lo)
726{
727	if (local(lo))
728		return;
729	if (interface(lo))
730		return;
731	if (host_v4(lo))
732		return;
733	if (host_v6(lo))
734		return;
735	if (host_dns(lo))
736		return;
737
738	errx(1, "invalid virtual ip or interface: %s", lo->ifx);
739}
740
741static void
742config_listener(struct listener *l,  struct listen_opts *lo)
743{
744	l->sock = -1;
745	l->proto = lo->proto;
746
747	TAILQ_INSERT_TAIL(&conf->listeners, l, entry);
748}
749
750static int
751local(struct listen_opts *lo)
752{
753	struct sockaddr_un	*sun;
754	struct listener		*h;
755
756	if (lo->family != AF_UNSPEC && lo->family != AF_LOCAL)
757		return 0;
758
759	if (lo->ifx[0] != '/')
760		return 0;
761
762	h = calloc(1, sizeof(*h));
763	sun = (struct sockaddr_un *)&h->ss;
764	sun->sun_len = sizeof(*sun);
765	sun->sun_family = AF_LOCAL;
766	if (strlcpy(sun->sun_path, lo->ifx, sizeof(sun->sun_path))
767	    >= sizeof(sun->sun_path))
768		fatalx("path too long");
769
770	config_listener(h,  lo);
771
772	return (1);
773}
774
775static int
776host_v4(struct listen_opts *lo)
777{
778	struct in_addr		 ina;
779	struct sockaddr_in	*sain;
780	struct listener		*h;
781
782	if (lo->family != AF_UNSPEC && lo->family != AF_INET)
783		return (0);
784
785	memset(&ina, 0, sizeof(ina));
786	if (inet_pton(AF_INET, lo->ifx, &ina) != 1)
787		return (0);
788
789	h = calloc(1, sizeof(*h));
790	sain = (struct sockaddr_in *)&h->ss;
791	sain->sin_len = sizeof(struct sockaddr_in);
792	sain->sin_family = AF_INET;
793	sain->sin_addr.s_addr = ina.s_addr;
794	sain->sin_port = lo->port;
795
796	config_listener(h,  lo);
797
798	return (1);
799}
800
801static int
802host_v6(struct listen_opts *lo)
803{
804	struct in6_addr		 ina6;
805	struct sockaddr_in6	*sin6;
806	struct listener		*h;
807
808	if (lo->family != AF_UNSPEC && lo->family != AF_INET6)
809		return (0);
810
811	memset(&ina6, 0, sizeof(ina6));
812	if (inet_pton(AF_INET6, lo->ifx, &ina6) != 1)
813		return (0);
814
815	h = calloc(1, sizeof(*h));
816	sin6 = (struct sockaddr_in6 *)&h->ss;
817	sin6->sin6_len = sizeof(struct sockaddr_in6);
818	sin6->sin6_family = AF_INET6;
819	sin6->sin6_port = lo->port;
820	memcpy(&sin6->sin6_addr, &ina6, sizeof(ina6));
821
822	config_listener(h,  lo);
823
824	return (1);
825}
826
827static int
828host_dns(struct listen_opts *lo)
829{
830	struct addrinfo		 hints, *res0, *res;
831	int			 error, cnt = 0;
832	struct sockaddr_in	*sain;
833	struct sockaddr_in6	*sin6;
834	struct listener		*h;
835
836	memset(&hints, 0, sizeof(hints));
837	hints.ai_family = lo->family;
838	hints.ai_socktype = SOCK_STREAM;
839	hints.ai_flags = AI_ADDRCONFIG;
840	error = getaddrinfo(lo->ifx, NULL, &hints, &res0);
841	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
842		return (0);
843	if (error) {
844		log_warnx("warn: host_dns: could not parse \"%s\": %s", lo->ifx,
845		    gai_strerror(error));
846		return (-1);
847	}
848
849	for (res = res0; res; res = res->ai_next) {
850		if (res->ai_family != AF_INET &&
851		    res->ai_family != AF_INET6)
852			continue;
853		h = calloc(1, sizeof(*h));
854		h->ss.ss_family = res->ai_family;
855		if (res->ai_family == AF_INET) {
856			sain = (struct sockaddr_in *)&h->ss;
857			sain->sin_len = sizeof(struct sockaddr_in);
858			sain->sin_addr.s_addr = ((struct sockaddr_in *)
859			    res->ai_addr)->sin_addr.s_addr;
860			sain->sin_port = lo->port;
861		} else {
862			sin6 = (struct sockaddr_in6 *)&h->ss;
863			sin6->sin6_len = sizeof(struct sockaddr_in6);
864			memcpy(&sin6->sin6_addr, &((struct sockaddr_in6 *)
865			    res->ai_addr)->sin6_addr, sizeof(struct in6_addr));
866			sin6->sin6_port = lo->port;
867		}
868
869		config_listener(h, lo);
870
871		cnt++;
872	}
873
874	freeaddrinfo(res0);
875	return (cnt);
876}
877
878static int
879interface(struct listen_opts *lo)
880{
881	struct ifaddrs *ifap, *p;
882	struct sockaddr_in	*sain;
883	struct sockaddr_in6	*sin6;
884	struct listener		*h;
885	int			ret = 0;
886
887	if (getifaddrs(&ifap) == -1)
888		fatal("getifaddrs");
889
890	for (p = ifap; p != NULL; p = p->ifa_next) {
891		if (p->ifa_addr == NULL)
892			continue;
893		if (strcmp(p->ifa_name, lo->ifx) != 0 &&
894		    !is_if_in_group(p->ifa_name, lo->ifx))
895			continue;
896		if (lo->family != AF_UNSPEC && lo->family != p->ifa_addr->sa_family)
897			continue;
898
899		h = calloc(1, sizeof(*h));
900
901		switch (p->ifa_addr->sa_family) {
902		case AF_INET:
903			sain = (struct sockaddr_in *)&h->ss;
904			*sain = *(struct sockaddr_in *)p->ifa_addr;
905			sain->sin_len = sizeof(struct sockaddr_in);
906			sain->sin_port = lo->port;
907			break;
908
909		case AF_INET6:
910			sin6 = (struct sockaddr_in6 *)&h->ss;
911			*sin6 = *(struct sockaddr_in6 *)p->ifa_addr;
912			sin6->sin6_len = sizeof(struct sockaddr_in6);
913			sin6->sin6_port = lo->port;
914			break;
915
916		default:
917			free(h);
918			continue;
919		}
920
921		config_listener(h, lo);
922		ret = 1;
923	}
924
925	freeifaddrs(ifap);
926
927	return ret;
928}
929
930static int
931is_if_in_group(const char *ifname, const char *groupname)
932{
933        unsigned int		 len;
934        struct ifgroupreq        ifgr;
935        struct ifg_req          *ifg;
936	int			 s;
937	int			 ret = 0;
938
939	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
940		err(1, "socket");
941
942        memset(&ifgr, 0, sizeof(ifgr));
943        if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
944		errx(1, "interface name too large");
945
946        if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
947                if (errno == EINVAL || errno == ENOTTY)
948			goto end;
949		err(1, "SIOCGIFGROUP");
950        }
951
952        len = ifgr.ifgr_len;
953        ifgr.ifgr_groups = calloc(len/sizeof(struct ifg_req),
954		sizeof(struct ifg_req));
955        if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
956                err(1, "SIOCGIFGROUP");
957
958        ifg = ifgr.ifgr_groups;
959        for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
960                len -= sizeof(struct ifg_req);
961		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
962			ret = 1;
963			break;
964		}
965        }
966        free(ifgr.ifgr_groups);
967
968end:
969	close(s);
970	return ret;
971}
972