120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
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#ifndef HAVE_SOCKETS
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#error getaddrinfo.c included by mistake! no socket support!
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#else
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include <errno.h>
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#include <string.h> /* strerror */
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#include "getaddrinfo.h"
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void
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freeaddrinfo(struct addrinfo *res)
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{
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if (res->ai_addr != NULL)
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free(res->ai_addr);
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free(res);
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}
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int
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getaddrinfo(const char *hostname, const char *portname,
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struct addrinfo *hints, struct addrinfo **res)
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{
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struct addrinfo *out;
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if (res == NULL)
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return EINVAL;
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out = (struct addrinfo *) calloc(1, sizeof(*out));
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if (out == NULL) {
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*res = NULL;
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return ENOMEM;
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}
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out->ai_addr = (struct sockaddr *) malloc(sizeof(struct sockaddr_in));
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if (out->ai_addr == NULL) {
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free(out);
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*res = NULL;
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return ENOMEM;
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}
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out->ai_socktype = SOCK_STREAM;
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if (hints != NULL) {
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if (hints->ai_socktype)
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out->ai_socktype = hints->ai_socktype;
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if (hints->ai_protocol)
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out->ai_protocol = hints->ai_protocol;
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}
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if (out->ai_protocol == 0) {
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switch (out->ai_socktype) {
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case SOCK_STREAM:
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out->ai_protocol = IPPROTO_TCP;
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break;
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case SOCK_DGRAM:
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out->ai_protocol = IPPROTO_UDP;
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break;
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case SOCK_RAW:
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out->ai_protocol = IPPROTO_RAW;
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break;
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}
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}
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out->ai_addrlen = sizeof(struct sockaddr_in);
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memset(out->ai_addr, '\0', sizeof(struct sockaddr_in));
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if (hostname != NULL) {
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struct hostent *he;
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he = gethostbyname(hostname);
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if (he != NULL && he->h_addr_list != NULL) {
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((struct sockaddr_in *)out->ai_addr)->sin_addr.s_addr
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= ((struct in_addr *)he->h_addr_list[0])->s_addr;
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} else {
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freeaddrinfo(out);
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return EADDRNOTAVAIL;
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}
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} else {
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if (!(out->ai_flags & AI_PASSIVE))
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((struct sockaddr_in *)out->ai_addr)->sin_addr.s_addr
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= htonl(INADDR_ANY);
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}
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((struct sockaddr_in *)out->ai_addr)->sin_family = AF_INET;
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out->ai_family = AF_INET;
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if (portname != NULL && *portname) {
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long portnum;
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char *end;
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portnum = strtol(portname, &end, 10);
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if (*end == '\0' && portnum > 0 && portnum < 65536) {
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((struct sockaddr_in *)out->ai_addr)->sin_port
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= htons(portnum);
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} else {
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struct servent *se;
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se = getservbyname(portname, NULL);
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if (se != NULL) {
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((struct sockaddr_in *)out->ai_addr)->sin_port
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= se->s_port;
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}
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}
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}
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*res = out;
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return 0;
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}
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const char *
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gai_strerror(int errcode)
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{
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return strerror(errcode);
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}
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#endif
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