1 /*	$NetBSD: find_inet.c,v 1.1.1.1 2009/06/23 10:08:59 tron Exp $	*/
2 
3 /*++
4 /* NAME
5 /*	find_inet 3
6 /* SUMMARY
7 /*	inet-domain name services
8 /* SYNOPSIS
9 /*	#include <find_inet.h>
10 /*
11 /*	unsigned find_inet_addr(host)
12 /*	const char *host;
13 /*
14 /*	int	find_inet_port(port, proto)
15 /*	const char *port;
16 /*	const char *proto;
17 /* DESCRIPTION
18 /*	These functions translate network address information from
19 /*	between printable form to the internal the form used by the
20 /*	BSD TCP/IP network software.
21 /*
22 /*	find_inet_addr() translates a symbolic or numerical hostname.
23 /*	This function is deprecated. Use hostname_to_hostaddr() instead.
24 /*
25 /*	find_inet_port() translates a symbolic or numerical port name.
26 /* BUGS
27 /*	find_inet_addr() ignores all but the first address listed for
28 /*	a symbolic hostname.
29 /* DIAGNOSTICS
30 /*	Lookup and conversion errors are fatal.
31 /* LICENSE
32 /* .ad
33 /* .fi
34 /*	The Secure Mailer license must be distributed with this software.
35 /* AUTHOR(S)
36 /*	Wietse Venema
37 /*	IBM T.J. Watson Research
38 /*	P.O. Box 704
39 /*	Yorktown Heights, NY 10598, USA
40 /*--*/
41 
42 /* System libraries. */
43 
44 #include <sys_defs.h>
45 #include <sys/socket.h>
46 #include <netinet/in.h>
47 #include <arpa/inet.h>
48 #include <netdb.h>
49 #include <stdlib.h>
50 #include <string.h>
51 
52 /* Application-specific. */
53 
54 #include "msg.h"
55 #include "stringops.h"
56 #include "find_inet.h"
57 
58 #ifndef INADDR_NONE
59 #define INADDR_NONE 0xffffffff
60 #endif
61 
62 /* find_inet_addr - translate numerical or symbolic host name */
63 
64 unsigned find_inet_addr(const char *host)
65 {
66     struct in_addr addr;
67     struct hostent *hp;
68 
69     addr.s_addr = inet_addr(host);
70     if ((addr.s_addr == INADDR_NONE) || (addr.s_addr == 0)) {
71 	if ((hp = gethostbyname(host)) == 0)
72 	    msg_fatal("host not found: %s", host);
73 	if (hp->h_addrtype != AF_INET)
74 	    msg_fatal("unexpected address family: %d", hp->h_addrtype);
75 	if (hp->h_length != sizeof(addr))
76 	    msg_fatal("unexpected address length %d", hp->h_length);
77 	memcpy((char *) &addr, hp->h_addr, hp->h_length);
78     }
79     return (addr.s_addr);
80 }
81 
82 /* find_inet_port - translate numerical or symbolic service name */
83 
84 int     find_inet_port(const char *service, const char *protocol)
85 {
86     struct servent *sp;
87     int     port;
88 
89     if (alldig(service) && (port = atoi(service)) != 0) {
90 	if (port < 0 || port > 65535)
91 	    msg_fatal("bad port number: %s", service);
92 	return (htons(port));
93     } else {
94 	if ((sp = getservbyname(service, protocol)) == 0)
95 	    msg_fatal("unknown service: %s/%s", service, protocol);
96 	return (sp->s_port);
97     }
98 }
99