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
49 TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
50 static struct file {
51 TAILQ_ENTRY(file) entry;
52 FILE *stream;
53 char *name;
54 int lineno;
55 int errors;
56 } *file, *topfile;
57 struct file *pushfile(const char *, int);
58 int popfile(void);
59 int check_file_secrecy(int, const char *);
60 int yyparse(void);
61 int yylex(void);
62 int kw_cmp(const void *, const void *);
63 int lookup(char *);
64 int lgetc(int);
65 int lungetc(int);
66 int findeol(void);
67 int yyerror(const char *, ...)
68 __attribute__((__format__ (printf, 1, 2)))
69 __attribute__((__nonnull__ (1)));
70
71 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
72 struct sym {
73 TAILQ_ENTRY(sym) entry;
74 int used;
75 int persist;
76 char *nam;
77 char *val;
78 };
79 int symset(const char *, const char *, int);
80 char *symget(const char *);
81
82 static int errors = 0;
83
84 struct lpd_conf *conf = NULL;
85
86 enum listen_options {
87 LO_FAMILY = 0x000001,
88 LO_PORT = 0x000002,
89 };
90
91 static 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
99 static void config_free(struct lpd_conf *);
100 static void create_listeners(struct listen_opts *);
101 static void config_listener(struct listener *, struct listen_opts *);
102 static int local(struct listen_opts *);
103 static int host_v4(struct listen_opts *);
104 static int host_v6(struct listen_opts *);
105 static int host_dns(struct listen_opts *);
106 static int interface(struct listen_opts *);
107 static int is_if_in_group(const char *, const char *);
108
109 typedef 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
128 grammar : /* empty */
129 | grammar '\n'
130 | grammar include '\n'
131 | grammar varset '\n'
132 | grammar main '\n'
133 | grammar error '\n' { file->errors++; }
134 ;
135
136 include : 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
151 varset : 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
169 portno : 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
189 family_inet : INET4 { $$ = AF_INET; }
190 | INET6 { $$ = AF_INET6; }
191 ;
192
193 opt_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
211 listener : opt_listen listener
212 | /* empty */ {
213 create_listeners(&listen_opts);
214 }
215 ;
216
217 main : 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
227 struct keywords {
228 const char *k_name;
229 int k_val;
230 };
231
232 int
yyerror(const char * fmt,...)233 yyerror(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
248 int
kw_cmp(const void * k,const void * e)249 kw_cmp(const void *k, const void *e)
250 {
251 return (strcmp(k, ((const struct keywords *)e)->k_name));
252 }
253
254 int
lookup(char * s)255 lookup(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
280 char *parsebuf;
281 int parseindex;
282 char pushback_buffer[MAXPUSHBACK];
283 int pushback_index = 0;
284
285 int
lgetc(int quotec)286 lgetc(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
333 int
lungetc(int c)334 lungetc(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
349 int
findeol(void)350 findeol(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
370 int
yylex(void)371 yylex(void)
372 {
373 char buf[8096];
374 char *p, *val;
375 int quotec, next, c;
376 int token;
377
378 top:
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 {
481 nodigits:
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
527 int
check_file_secrecy(int fd,const char * fname)528 check_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
547 struct file *
pushfile(const char * name,int secret)548 pushfile(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
578 int
popfile(void)579 popfile(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
594 struct lpd_conf *
parse_config(const char * filename,int verbose)595 parse_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
641 int
symset(const char * nam,const char * val,int persist)642 symset(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
681 int
cmdline_symset(char * s)682 cmdline_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
698 char *
symget(const char * nam)699 symget(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
712 static void
config_free(struct lpd_conf * c)713 config_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
724 static void
create_listeners(struct listen_opts * lo)725 create_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
741 static void
config_listener(struct listener * l,struct listen_opts * lo)742 config_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
750 static int
local(struct listen_opts * lo)751 local(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
775 static int
host_v4(struct listen_opts * lo)776 host_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
801 static int
host_v6(struct listen_opts * lo)802 host_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
827 static int
host_dns(struct listen_opts * lo)828 host_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
878 static int
interface(struct listen_opts * lo)879 interface(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
930 static int
is_if_in_group(const char * ifname,const char * groupname)931 is_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
968 end:
969 close(s);
970 return ret;
971 }
972