4 * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
5 * These funtions are defined in rfc2133.
7 * But these functions are not implemented correctly. The minimum subset
8 * is implemented for ssh use only. For exapmle, this routine assumes
9 * that ai_family is AF_INET. Don't use it for another purpose.
15 #ifndef HAVE_GAI_STRERROR
16 char *gai_strerror(int ecode)
20 return "no address associated with hostname.";
22 return "memory allocation failure.";
24 return "unknown error.";
27 #endif /* !HAVE_GAI_STRERROR */
29 #ifndef HAVE_FREEADDRINFO
30 void freeaddrinfo(struct addrinfo *ai)
32 struct addrinfo *next;
37 } while (NULL != (ai = next));
39 #endif /* !HAVE_FREEADDRINFO */
41 #ifndef HAVE_GETADDRINFO
42 static struct addrinfo *malloc_ai(int port, u_long addr)
46 ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
50 memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
52 ai->ai_addr = (struct sockaddr *)(ai + 1);
53 /* XXX -- ssh doesn't use sa_len */
54 ai->ai_addrlen = sizeof(struct sockaddr_in);
55 ai->ai_addr->sa_family = ai->ai_family = AF_INET;
57 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
58 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
63 int getaddrinfo(const char *hostname, const char *servname,
64 const struct addrinfo *hints, struct addrinfo **res)
66 struct addrinfo *cur, *prev = NULL;
72 port = htons(atoi(servname));
76 if (hints && hints->ai_flags & AI_PASSIVE) {
77 if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
84 if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
90 if (inet_aton(hostname, &in) != -1) {
91 if (NULL != (*res = malloc_ai(port, in.s_addr)))
97 hp = gethostbyname(hostname);
98 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
99 for (i = 0; hp->h_addr_list[i]; i++) {
100 cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
119 #endif /* !HAVE_GETADDRINFO */