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>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
40 * General address-family operations.
43 #define SIN(sa) ((struct sockaddr_in *)(sa))
44 #define CSIN(sa) ((const struct sockaddr_in *)(sa))
46 #define SIN6(sa) ((struct sockaddr_in6 *)(sa))
47 #define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
49 /* This gadget (thanks, Richard Kettlewell) makes sure that we handle the
50 * same set of address families in each switch. */
51 #define AF_CASES(pre) \
52 case AF_INET: goto pre##_inet; \
53 case AF_INET6: goto pre##_inet6
55 static void unknown_af(int af
) {
56 fprintf(stderr
, "ADNS INTERNAL: unknown address family %d\n", af
);
60 #define IN6_ADDR_EQUALP(a, b) \
61 (!memcmp((a).s6_addr, (b).s6_addr, sizeof((a).s6_addr)))
63 int adns__genaddr_equal_p(int af
, const union gen_addr
*a
,
64 int bf
, const void *b
) {
65 const union gen_addr
*bb
= b
;
66 if (af
!= bf
) return 0;
69 af_inet
: return a
->v4
.s_addr
== bb
->v4
.s_addr
;
70 af_inet6
: return IN6_ADDR_EQUALP(a
->v6
, bb
->v6
);
71 default: unknown_af(af
); return -1;
75 int adns__sockaddr_equal_p(const struct sockaddr
*sa
,
76 const struct sockaddr
*sb
) {
77 if (sa
->sa_family
!= sb
->sa_family
) return 0;
78 switch (sa
->sa_family
) {
81 const struct sockaddr_in
*sina
= CSIN(sa
), *sinb
= CSIN(sb
);
82 return (sina
->sin_addr
.s_addr
== sinb
->sin_addr
.s_addr
&&
83 sina
->sin_port
== sinb
->sin_port
);
86 /* Don't check the flowlabel. That's apparently useful for routing
87 * performance, but doesn't affect the address in any important
89 const struct sockaddr_in6
*sin6a
= CSIN6(sa
), *sin6b
= CSIN6(sb
);
90 return (IN6_ADDR_EQUALP(sin6a
->sin6_addr
, sin6b
->sin6_addr
) &&
91 sin6a
->sin6_port
== sin6b
->sin6_port
&&
92 sin6a
->sin6_scope_id
== sin6b
->sin6_scope_id
);
95 unknown_af(sa
->sa_family
);
100 int adns__addr_width(int af
) {
104 af_inet6
: return 128;
105 default: unknown_af(af
); return -1;
109 void adns__prefix_mask(int af
, int len
, union gen_addr
*mask_r
) {
114 mask_r
->v4
.s_addr
= htonl(!len ?
0 : 0xffffffff << (32-len
));
117 int i
= len
/8, j
= len
%8;
118 unsigned char *m
= mask_r
->v6
.s6_addr
;
121 if (j
) m
[i
++]= (0xff << (8-j
)) & 0xff;
122 memset(m
+i
, 0, 16-i
);
130 int adns__guess_prefix_length(int af
, const union gen_addr
*addr
) {
134 unsigned a
= (ntohl(addr
->v4
.s_addr
) >> 24) & 0xff;
135 if (a
< 128) return 8;
136 else if (a
< 192) return 16;
137 else if (a
< 224) return 24;
148 int adns__addr_match_p(int addraf
, const union gen_addr
*addr
,
149 int netaf
, const union gen_addr
*base
,
150 const union gen_addr
*mask
)
152 if (addraf
!= netaf
) return 0;
156 return (addr
->v4
.s_addr
& mask
->v4
.s_addr
) == base
->v4
.s_addr
;
159 const char *a
= addr
->v6
.s6_addr
;
160 const char *b
= base
->v6
.s6_addr
;
161 const char *m
= mask
->v6
.s6_addr
;
162 for (i
= 0; i
< 16; i
++)
163 if ((a
[i
] & m
[i
]) != b
[i
]) return 0;
172 void adns__sockaddr_extract(const struct sockaddr
*sa
,
173 union gen_addr
*a_r
, int *port_r
) {
174 switch (sa
->sa_family
) {
177 const struct sockaddr_in
*sin
= CSIN(sa
);
178 if (port_r
) *port_r
= ntohs(sin
->sin_port
);
179 if (a_r
) a_r
->v4
= sin
->sin_addr
;
183 const struct sockaddr_in6
*sin6
= CSIN6(sa
);
184 if (port_r
) *port_r
= ntohs(sin6
->sin6_port
);
185 if (a_r
) a_r
->v6
= sin6
->sin6_addr
;
189 unknown_af(sa
->sa_family
);
193 void adns__sockaddr_inject(const union gen_addr
*a
, int port
,
194 struct sockaddr
*sa
) {
195 switch (sa
->sa_family
) {
198 struct sockaddr_in
*sin
= SIN(sa
);
199 if (port
!= -1) sin
->sin_port
= htons(port
);
200 if (a
) sin
->sin_addr
= a
->v4
;
204 struct sockaddr_in6
*sin6
= SIN6(sa
);
205 if (port
!= -1) sin6
->sin6_port
= htons(port
);
206 if (a
) sin6
->sin6_addr
= a
->v6
;
210 unknown_af(sa
->sa_family
);