2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2015, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * host.c: make stream connection to empire
29 * Known contributors to this file:
32 * Markus Armbruster, 2005-2013
42 #include <sys/types.h>
43 #include <sys/socket.h>
44 #include <netinet/in.h>
45 #include <arpa/inet.h>
50 /* Portability cruft, should become unnecessary eventually */
52 #define AI_ADDRCONFIG 0
55 #ifdef HAVE_GETADDRINFO
57 * Inspired by example code from W. Richard Stevens: UNIX Network
62 tcp_connect(char *host, char *serv)
65 struct addrinfo hints, *res, *ressave;
67 memset(&hints, 0, sizeof(struct addrinfo));
68 hints.ai_flags = AI_ADDRCONFIG;
69 hints.ai_family = AF_UNSPEC;
70 hints.ai_socktype = SOCK_STREAM;
72 if ((n = getaddrinfo(host, serv, &hints, &res)) != 0) {
73 fprintf(stderr, "Can't connect to %s:%s: %s\n",
74 host, serv, gai_strerror(n));
80 sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
82 continue; /* ignore this one */
84 if (connect(sockfd, res->ai_addr, res->ai_addrlen) == 0)
86 close(sockfd); /* ignore this one */
87 } while ((res = res->ai_next) != NULL);
89 if (res == NULL) { /* errno from final socket() or connect() */
90 fprintf(stderr, "Can't connect to %s:%s: %s\n",
91 host, serv, strerror(errno));
95 freeaddrinfo(ressave);
100 #else /* !HAVE_GETADDRINFO */
103 hostaddr(char *name, struct sockaddr_in *addr)
107 if (name == NULL || *name == 0)
109 if (isdigit(*name)) {
110 addr->sin_addr.s_addr = inet_addr(name);
112 hp = gethostbyname(name);
115 memcpy(&addr->sin_addr, hp->h_addr, sizeof(addr->sin_addr));
121 hostport(char *name, struct sockaddr_in *addr)
125 if (name == NULL || *name == 0)
127 if (isdigit(*name)) {
128 addr->sin_port = htons(atoi(name));
130 sp = getservbyname(name, "tcp");
133 addr->sin_port = sp->s_port;
139 hostconnect(struct sockaddr_in *addr)
141 /* FIXME should attempt connect to all addresses of multi-homed host, not just 1st */
144 s = socket(AF_INET, SOCK_STREAM, 0);
148 addr->sin_family = AF_INET;
149 if (connect(s, (struct sockaddr *)addr, sizeof(*addr)) < 0) {
157 tcp_connect(char *host, char *serv)
159 struct sockaddr_in sin;
162 if (!hostport(serv, &sin)) {
163 fprintf(stderr, "Can't resolve Empire port %s\n", serv);
166 if (!hostaddr(host, &sin)) {
167 fprintf(stderr, "Can't resolve Empire host %s\n", host);
170 if ((sock = hostconnect(&sin)) < 0) {
171 fprintf(stderr, "Can't connect to %s:%s: %s\n",
172 serv, host, strerror(errno));