2 #include <sys/socket.h>
3 #include <netinet/in.h>
12 int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
14 struct service ports[MAXSERVS];
15 struct address addrs[MAXADDRS];
16 char canon[256], *outcanon;
17 int nservs, naddrs, nais, canon_len, i, j, k;
18 int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
22 struct sockaddr_in sin;
23 struct sockaddr_in6 sin6;
27 if (!host && !serv) return EAI_NONAME;
30 family = hint->ai_family;
31 flags = hint->ai_flags;
32 proto = hint->ai_protocol;
33 socktype = hint->ai_socktype;
35 const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
36 AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
37 if ((flags & mask) != flags)
50 if (flags & AI_ADDRCONFIG) {
51 /* Define the "an address is configured" condition for address
52 * families via ability to create a socket for the family plus
53 * routability of the loopback address for the family. */
54 static const struct sockaddr_in lo4 = {
55 .sin_family = AF_INET, .sin_port = 65535,
56 .sin_addr.s_addr = __BYTE_ORDER == __BIG_ENDIAN
57 ? 0x7f000001 : 0x0100007f
59 static const struct sockaddr_in6 lo6 = {
60 .sin6_family = AF_INET6, .sin6_port = 65535,
61 .sin6_addr = IN6ADDR_LOOPBACK_INIT
63 int tf[2] = { AF_INET, AF_INET6 };
64 const void *ta[2] = { &lo4, &lo6 };
65 socklen_t tl[2] = { sizeof lo4, sizeof lo6 };
67 if (family==tf[1-i]) continue;
68 int s = socket(tf[i], SOCK_CLOEXEC|SOCK_DGRAM,
72 pthread_setcancelstate(
73 PTHREAD_CANCEL_DISABLE, &cs);
74 int r = connect(s, ta[i], tl[i]);
75 pthread_setcancelstate(cs, 0);
79 if (errno != EAFNOSUPPORT) return EAI_SYSTEM;
80 if (family == tf[i]) return EAI_NONAME;
85 nservs = __lookup_serv(ports, serv, proto, socktype, flags);
86 if (nservs < 0) return nservs;
88 naddrs = __lookup_name(addrs, canon, host, family, flags);
89 if (naddrs < 0) return naddrs;
91 nais = nservs * naddrs;
92 canon_len = strlen(canon);
93 out = calloc(1, nais * sizeof(*out) + canon_len + 1);
94 if (!out) return EAI_MEMORY;
97 outcanon = (void *)&out[nais];
98 memcpy(outcanon, canon, canon_len+1);
103 for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
104 out[k].ai = (struct addrinfo){
105 .ai_family = addrs[i].family,
106 .ai_socktype = ports[j].socktype,
107 .ai_protocol = ports[j].proto,
108 .ai_addrlen = addrs[i].family == AF_INET
109 ? sizeof(struct sockaddr_in)
110 : sizeof(struct sockaddr_in6),
111 .ai_addr = (void *)&out[k].sa,
112 .ai_canonname = outcanon,
113 .ai_next = &out[k+1].ai };
114 switch (addrs[i].family) {
116 out[k].sa.sin.sin_family = AF_INET;
117 out[k].sa.sin.sin_port = htons(ports[j].port);
118 memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
121 out[k].sa.sin6.sin6_family = AF_INET6;
122 out[k].sa.sin6.sin6_port = htons(ports[j].port);
123 out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
124 memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
128 out[nais-1].ai.ai_next = 0;