3 * - address-family specific code
6 * This file is part of adns, which is
7 * Copyright (C) 1997-2000,2003,2006 Ian Jackson
8 * Copyright (C) 1999-2000,2003,2006 Tony Finch
9 * Copyright (C) 1991 Massachusetts Institute of Technology
10 * (See the file INSTALL for full details.)
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
32 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
41 * General address-family operations.
44 #define SIN(sa) ((struct sockaddr_in *)(sa))
45 #define CSIN(sa) ((const struct sockaddr_in *)(sa))
47 #define SIN6(sa) ((struct sockaddr_in6 *)(sa))
48 #define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
50 /* This gadget (thanks, Richard Kettlewell) makes sure that we handle the
51 * same set of address families in each switch. */
52 #define AF_CASES(pre) \
53 case AF_INET: goto pre##_inet; \
54 case AF_INET6: goto pre##_inet6
56 static void unknown_af(int af
) {
57 fprintf(stderr
, "ADNS INTERNAL: unknown address family %d\n", af
);
61 int adns__af_supported_p(int af
)
65 af_inet
: af_inet6
: return 1;
70 int adns__sockaddr_equal_p(const struct sockaddr
*sa
,
71 const struct sockaddr
*sb
)
73 if (sa
->sa_family
!= sb
->sa_family
) return 0;
74 switch (sa
->sa_family
) {
77 const struct sockaddr_in
*sina
= CSIN(sa
), *sinb
= CSIN(sb
);
78 return (sina
->sin_addr
.s_addr
== sinb
->sin_addr
.s_addr
&&
79 sina
->sin_port
== sinb
->sin_port
);
82 /* Don't check the flowlabel. That's apparently useful for routing
83 * performance, but doesn't affect the address in any important
86 const struct sockaddr_in6
*sin6a
= CSIN6(sa
), *sin6b
= CSIN6(sb
);
87 return (memcmp(sin6a
->sin6_addr
.s6_addr
,
88 sin6b
->sin6_addr
.s6_addr
,
89 sizeof(sin6a
->sin6_addr
.s6_addr
)) == 0 &&
90 sin6a
->sin6_port
== sin6b
->sin6_port
&&
91 sin6a
->sin6_scope_id
== sin6b
->sin6_scope_id
);
94 unknown_af(sa
->sa_family
);
99 int adns__gen_pton(const char *p
, int *af_r
, union gen_addr
*addr_r
)
101 static const int aflist
[] = { AF_INET6
, AF_INET
};
104 for (i
= 0; i
< sizeof(aflist
)/sizeof(*aflist
); i
++) {
105 rc
= inet_pton(aflist
[i
], p
, addr_r
);
107 if (rc
) { *af_r
= aflist
[i
]; return 1; }
112 int adns__addr_width(int af
)
117 af_inet6
: return 128;
118 default: unknown_af(af
); return -1;
122 void adns__prefix_mask(int af
, int len
, union gen_addr
*mask_r
)
128 mask_r
->v4
.s_addr
= htonl(!len ?
0 : 0xffffffff << (32 - len
));
131 int i
= len
/8, j
= len
%8;
132 unsigned char *m
= mask_r
->v6
.s6_addr
;
136 if (j
) m
[i
++] = (0xff << (8-j
)) & 0xff;
137 memset(m
+i
, 0, 16-i
);
145 int adns__guess_prefix_length(int af
, const union gen_addr
*addr
)
150 unsigned a
= (ntohl(addr
->v4
.s_addr
) >> 24) & 0xff;
152 if (a
< 128) return 8;
153 else if (a
< 192) return 16;
154 else if (a
< 224) return 24;
165 int adns__addr_match_p(int addraf
, const union gen_addr
*addr
,
166 int netaf
, const union gen_addr
*base
,
167 const union gen_addr
*mask
)
169 if (addraf
!= netaf
) return 0;
173 return (addr
->v4
.s_addr
& mask
->v4
.s_addr
) == base
->v4
.s_addr
;
176 const char *a
= addr
->v6
.s6_addr
;
177 const char *b
= base
->v6
.s6_addr
;
178 const char *m
= mask
->v6
.s6_addr
;
180 for (i
= 0; i
< 16; i
++)
181 if ((a
[i
] & m
[i
]) != b
[i
]) return 0;
190 const void *adns__sockaddr_to_inaddr(const struct sockaddr
*sa
)
192 switch (sa
->sa_family
) {
194 af_inet
: return &CSIN(sa
)->sin_addr
;
195 af_inet6
: return &CSIN6(sa
)->sin6_addr
;
196 default: unknown_af(sa
->sa_family
); return 0;
201 * addr2text and text2addr
204 int adns__addr2text(adns_state ads
/* 0 ok */, adns_query qu
/* 0 ok */,
205 const struct sockaddr
*sa
,
206 char *addr_buffer
, int *addr_buflen
,
211 if (*addr_buflen
< ADNS_ADDR2TEXT_BUFLEN
) {
212 *addr_buflen
= ADNS_ADDR2TEXT_BUFLEN
;
216 switch (sa
->sa_family
) {
218 af_inet
: src
= &CSIN(sa
)->sin_addr
; port
= SIN(sa
)->sin_port
; break;
219 af_inet6
: src
= &CSIN6(sa
)->sin6_addr
; port
= SIN6(sa
)->sin6_port
; break;
220 default: return EAFNOSUPPORT
;
223 const char *ok
= inet_ntop(sa
->sa_family
, src
, addr_buffer
, *addr_buflen
);
226 if (sa
->sa_family
== AF_INET6
) {
227 uint32_t scope
= CSIN6(sa
)->sin6_scope_id
;
229 scope
= ntohl(scope
);
230 int scopeoffset
= strlen(addr_buffer
);
231 int remain
= *addr_buflen
- scopeoffset
,
232 int r
= snprintf(addr_buffer
+ scopeoffset
, remain
,
233 "%%%"PRIu32
"", scope
);
234 assert(r
< *addr_buflen
- scopeoffset
);
235 adns__debug(ads
,-1,qu
, "addr2text: converted scoped address %s",
240 if (port_r
) *port_r
= ntohs(port
);
244 int adns_addr2text(adns_state ads
,
245 const struct sockaddr
*sa
,
246 char *addr_buffer
, int *addr_buflen
/* set iff ENOSPC */,
248 return adns__addr2text(ads
,0, sa
,addr_buffer
,addr_buflen
,port_r
);
251 static void text2addr_einval(adns_state ads
, adns_query qu
,
252 const char *addr
, const char *problem
) {
254 char dumpbuf
[ADNS_ADDR2TEXT_BUFLEN
* 4];
258 int adns__text2addr(adns_state ads
/* 0 ok */, adns_query qu
/* 0 ok */,
259 const char *addr
, uint16_t port
, struct sockaddr
*sa
,
260 socklen_t
*salen
/* set if OK or ENOSPC */) {
262 char copybuf
[INET6_ADDRSTRLEN
];
265 if (strchr(addr
, ":")) {
269 const char *percent
= strchr(addr
, "%");
271 ptrdiff_t lhslen
= percent
- addr
;
272 if (lhslen
>= INET6_ADDRSTRLEN
) {
273 adns__debug(ads
,-1,qu
, "text2addr: scoped addr lhs too long
278 int adns_text2addr(adns_state ads /* may be 0! used for debug log only */,
279 const char *addr, int port, struct sockaddr *sa,
280 socklen_t *salen /* set if OK or ENOSPC */);
284 assert(*addr_buflen > INET_ADDRSTRLEN && *addr_buflen > INET6_ADDRSTRLEN);
285 switch (sa->sa_family) {
287 af_inet: dst= &CSIN(sa)->sin_addr; port= CSIN(sa)->sin_port; break;
288 af_inet6: dst= &CSIN6(sa)->sin6_addr; port= CSIN6(sa)->sin6_port; break;
289 default: return EAFNOSUPPORT;
292 inet_pton(sa->sa_family,
293 const struct sockaddr *sin =
298 * Reverse-domain parsing and construction.
301 int adns__make_reverse_domain(const struct sockaddr *sa,
303 char **buf_io, size_t bufsz,
310 const unsigned char *ap;
313 switch (sa->sa_family) {
317 if (!zone) zone = "in
-addr
.arpa
";
321 if (!zone) zone = "ip6
.arpa
";
327 req += strlen(zone) + 1;
331 p = malloc(req); if (!p) return errno;
336 switch (sa->sa_family) {
339 aa = ntohl(CSIN(sa)->sin_addr.s_addr);
340 for (i = 0; i < 4; i++) {
341 p += sprintf(p, "%d
", (int)(aa & 0xff));
347 ap = CSIN6(sa)->sin6_addr.s6_addr + 16;
348 for (i = 0; i < 16; i++) {
350 for (j = 0; j < 2; j++) {
352 if (y < 10) *p++ = y + '0';
353 else *p++ = y - 10 + 'a';
360 unknown_af(sa->sa_family);
368 static int inet_rev_parsecomp(const char *p, size_t n)
371 if (n > 3) return -1;
374 if ('0' <= *p && *p <= '9') i = 10*i + *p++ - '0';
380 static void inet_rev_mkaddr(union gen_addr *addr, const byte *ipv)
382 addr->v4.s_addr = htonl((ipv[3]<<24) | (ipv[2]<<16) |
383 (ipv[1]<<8) | (ipv[0]));
386 static int inet6_rev_parsecomp(const char *p, size_t n)
388 if (n != 1) return -1;
389 else if ('0' <= *p && *p <= '9') return *p - '0';
390 else if ('a' <= *p && *p <= 'f') return *p - 'a' + 10;
391 else if ('A' <= *p && *p <= 'F') return *p - 'a' + 10;
395 static void inet6_rev_mkaddr(union gen_addr *addr, const byte *ipv)
397 unsigned char *a = addr->v6.s6_addr;
400 for (i = 0; i < 16; i++)
401 a[i] = (ipv[31-2*i] << 4) | (ipv[30-2*i] << 0);
404 static const struct revparse_domain {
405 int af; /* address family */
406 int nrevlab; /* n of reverse-address labels */
407 adns_rrtype rrtype; /* forward-lookup type */
409 int (*rev_parsecomp)(const char *p, size_t n);
410 /* parse a single component from a label; return the integer value, or -1
411 * if it was unintelligible.
414 void (*rev_mkaddr)(union gen_addr *addr, const byte *ipv);
415 /* write out the parsed address from a vector of parsed components */
417 const char *const tail[3]; /* tail label names */
418 } revparse_domains[NREVDOMAINS] = {
419 { AF_INET, 4, adns_r_a, inet_rev_parsecomp, inet_rev_mkaddr,
420 { DNS_INADDR_ARPA, 0 } },
421 { AF_INET6, 32, adns_r_aaaa, inet6_rev_parsecomp, inet6_rev_mkaddr,
422 { DNS_IP6_ARPA, 0 } },
425 #define REVDOMAIN_MAP(rps, labnum) \
426 ((labnum) ? (rps)->map : (1 << NREVDOMAINS) - 1)
428 int adns__revparse_label(struct revparse_state *rps, int labnum,
429 const char *label, int lablen)
431 unsigned f = REVDOMAIN_MAP(rps, labnum);
432 const struct revparse_domain *rpd;
437 for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
438 if (!(f & d)) continue;
439 if (labnum >= rpd->nrevlab) {
440 tp = rpd->tail[labnum - rpd->nrevlab];
441 if (!tp || strncmp(label, tp, lablen) != 0 || tp[lablen])
444 ac = rpd->rev_parsecomp(label, lablen);
445 if (ac < 0) goto mismatch;
446 assert(labnum < sizeof(rps->ipv[i]));
447 rps->ipv[i][labnum] = ac;
460 int adns__revparse_done(struct revparse_state *rps, int nlabels,
461 adns_rrtype *rrtype_r, struct af_addr *addr_r)
463 unsigned f = REVDOMAIN_MAP(rps, nlabels);
464 const struct revparse_domain *rpd;
468 for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
469 if (!(f & d)) continue;
470 if (nlabels >= rpd->nrevlab && !rpd->tail[nlabels - rpd->nrevlab])
471 { found = i; continue; }
475 assert(found >= 0); assert(f == (1 << found));
477 rpd = &revparse_domains[found];
478 *rrtype_r = rpd->rrtype;
479 addr_r->af = rpd->af;
480 rpd->rev_mkaddr(&addr_r->addr, rps->ipv[found]);