1 /*        $NetBSD: connecttcp.c,v 1.2 2012/07/22 14:27:36 darrenr Exp $         */
2 
3 /*
4  * Copyright (C) 2012 by Darren Reed.
5  *
6  * See the IPFILTER.LICENCE file for details on licencing.
7  *
8  * Id: connecttcp.c,v 1.1.1.2 2012/07/22 13:44:38 darrenr Exp $
9  */
10 
11 #include "ipf.h"
12 #include <ctype.h>
13 
14 /*
15  * Format expected is one addres per line, at the start of each line.
16  */
17 int
connecttcp(char * server,int port)18 connecttcp(char *server, int port)
19 {
20           struct sockaddr_in sin;
21           struct hostent *host;
22           int fd;
23 
24           memset(&sin, 0, sizeof(sin));
25           sin.sin_family = AF_INET;
26           sin.sin_port = htons(port & 65535);
27 
28           if (ISDIGIT(*server)) {
29                     if (inet_aton(server, &sin.sin_addr) == -1) {
30                               return -1;
31                     }
32           } else {
33                     host = gethostbyname(server);
34                     if (host == NULL)
35                               return -1;
36                     memcpy(&sin.sin_addr, host->h_addr_list[0],
37                            sizeof(sin.sin_addr));
38           }
39 
40           fd = socket(AF_INET, SOCK_STREAM, 0);
41           if (fd == -1)
42                     return -1;
43 
44           if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
45                     close(fd);
46                     return -1;
47           }
48 
49           return fd;
50 }
51