2 * copyright (c) 2011 Emil Mikulic.
4 * addr.c: compound IPv4/IPv6 address
6 * You may use, modify and redistribute this file under the terms of the
7 * GNU General Public License version 2. (see COPYING.GPL)
12 #include <arpa/inet.h> /* for inet_ntop */
14 #include <string.h> /* for memcmp */
15 #include <netdb.h> /* for getaddrinfo */
17 int addr_equal(const struct addr * const a, const struct addr * const b)
19 if (a->family != b->family)
21 if (a->family == IPv4)
22 return (a->ip.v4 == b->ip.v4);
24 assert(a->family == IPv6);
25 return (memcmp(&(a->ip.v6), &(b->ip.v6), sizeof(a->ip.v6)) == 0);
29 static char _addrstrbuf[INET6_ADDRSTRLEN];
30 const char *addr_to_str(const struct addr * const a)
32 if (a->family == IPv4) {
35 return (inet_ntoa(in));
37 assert(a->family == IPv6);
38 inet_ntop(AF_INET6, &(a->ip.v6), _addrstrbuf, sizeof(_addrstrbuf));
43 int str_to_addr(const char *s, struct addr *a)
45 struct addrinfo hints, *ai;
48 memset(&hints, 0, sizeof(hints));
49 hints.ai_family = AF_UNSPEC;
50 hints.ai_flags = AI_NUMERICHOST;
52 if ((ret = getaddrinfo(s, NULL, &hints, &ai)) != 0)
55 if (ai->ai_family == AF_INET) {
57 a->ip.v4 = ((const struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr;
58 } else if (ai->ai_family == AF_INET6) {
61 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
71 void addr_mask(struct addr *a, const struct addr * const mask)
73 assert(a->family == mask->family);
74 if (a->family == IPv4)
75 a->ip.v4 &= mask->ip.v4;
79 assert(a->family == IPv6);
80 for (i=0; i<sizeof(a->ip.v6.s6_addr); i++)
81 a->ip.v6.s6_addr[i] &= mask->ip.v6.s6_addr[i];
85 int addr_inside(const struct addr * const a,
86 const struct addr * const net, const struct addr * const mask)
90 assert(a->family == net->family);
91 assert(a->family == mask->family);
94 addr_mask(&masked, mask);
95 return (addr_equal(&masked, net));
98 /* vim:set ts=3 sw=3 tw=78 et: */