3 * Copyright (C) 2004 Simone Piccardi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * Return a connected socket given hostname, service, and socket type
24 * Author: Simone Piccardi
29 ****************************************************************/
30 #include <arpa/inet.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
40 int sockconn(char *host, char *serv, int prot, int type)
42 struct addrinfo hint, *addr, *save;
46 char buffer[INET6_ADDRSTRLEN];
47 struct sockaddr_in *ip4;
48 struct sockaddr_in6 *ip6;
49 /* initialize hint structure */
50 memset(&hint, 0, sizeof(struct addrinfo));
51 hint.ai_family = PF_UNSPEC; /* generic address (IPv4 or IPv6) */
52 hint.ai_protocol = prot; /* protocol */
53 hint.ai_socktype = type; /* socket type */
54 res = getaddrinfo(host, serv, &hint, &addr); /* calling getaddrinfo */
55 if (res != 0) { /* on error exit */
56 printf("sockconn cannot resolve host %s, service %s, ", host, serv);
57 printf("protocol %d: %s\n", prot, gai_strerror(res));
58 errno = 0; /* clear errno */
61 /* loop on possible addresses */
63 while (addr != NULL) {
64 if (addr->ai_family == PF_INET) {
65 ip4 = (struct sockaddr_in *) addr->ai_addr;
66 printf("Indirizzo %s\n", inet_ntop(ip4->sin_family, &ip4->sin_addr,
67 buffer, sizeof(buffer)));
69 ip6 = (struct sockaddr_in6 *) addr->ai_addr;
70 printf("Indirizzo %s\n", inet_ntop(ip6->sin6_family,
72 buffer, sizeof(buffer)));
75 sock = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
77 if (addr->ai_next != NULL) {
81 printf("sockconn cannot create socket\n");
85 /* connect the socket */
86 res = connect(sock, addr->ai_addr, addr->ai_addrlen);
88 if (addr->ai_next != NULL) {
96 printf("sockconn cannot connect socket\n");
101 freeaddrinfo(save); /* done, release memory */