Remove some unnecessary casts.
[dragonfly.git] / lib / libatm / ip_addr.c
CommitLineData
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1/*
2 *
3 * ===================================
4 * HARP | Host ATM Research Platform
5 * ===================================
6 *
7 *
8 * This Host ATM Research Platform ("HARP") file (the "Software") is
9 * made available by Network Computing Services, Inc. ("NetworkCS")
10 * "AS IS". NetworkCS does not provide maintenance, improvements or
11 * support of any kind.
12 *
13 * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
14 * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
15 * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
16 * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
17 * In no event shall NetworkCS be responsible for any damages, including
18 * but not limited to consequential damages, arising from or relating to
19 * any use of the Software or related support.
20 *
21 * Copyright 1994-1998 Network Computing Services, Inc.
22 *
23 * Copies of this Software may be made, however, the above copyright
24 * notice must be reproduced on all copies.
25 *
26 * @(#) $FreeBSD: src/lib/libatm/ip_addr.c,v 1.3.2.1 2001/09/28 16:52:10 dillon Exp $
d797dc5d 27 * @(#) $DragonFly: src/lib/libatm/ip_addr.c,v 1.5 2008/09/30 16:57:04 swildner Exp $
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28 *
29 */
30
31#include <sys/cdefs.h>
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32
33/*
34 * User Space Library Functions
35 * ----------------------------
36 *
37 * IP address utilities
38 *
39 */
40
41#include <sys/types.h>
42#include <sys/param.h>
43#include <sys/socket.h>
44#include <net/if.h>
45#include <netinet/in.h>
46#include <arpa/inet.h>
47#include <netatm/port.h>
48#include <netatm/atm.h>
49#include <netatm/atm_if.h>
50#include <netatm/atm_sap.h>
51#include <netatm/atm_sys.h>
52#include <netatm/atm_ioctl.h>
53
54#include <netdb.h>
7bc7e232 55#include <stdio.h>
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56#include <string.h>
57
58#include "libatm.h"
59
60/*
61 * Get IP address
62 *
63 * Return an IP address in a socket address structure, given a character
64 * string with a domain name or a dotted decimal number.
65 *
66 * Arguments:
67 * p pointer to a host name or IP address
68 *
69 * Returns:
70 * null error was encountered
71 * struct sockaddr_in * a pointer to a socket address with the
72 * requested IP address
73 *
74 */
75struct sockaddr_in *
d797dc5d 76get_ip_addr(char *p)
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77{
78 struct hostent *ip_host;
79 static struct sockaddr_in sin;
80
81 /*
82 * Get IP address of specified host name
83 */
84 UM_ZERO(&sin, sizeof(sin));
85 sin.sin_family = AF_INET;
86 if (p[0] >= '0' && p[0] <= '9') {
87 /*
88 * IP address is in dotted decimal format
89 */
90 if ((sin.sin_addr.s_addr = inet_addr(p)) == -1) {
91 return((struct sockaddr_in *)0);
92 }
93 } else {
94 /*
95 * Host name is in domain name system format
96 */
97 ip_host = gethostbyname(p);
98 if (!ip_host ||
99 ip_host->h_addrtype != AF_INET) {
100 return((struct sockaddr_in *)0);
101 }
102 sin.sin_addr.s_addr = *(u_long *)ip_host->h_addr_list[0];
103 }
104 return(&sin);
105}
106
107
108/*
109 * Format an IP address
110 *
111 * Return a text-formatted string with an IP address and domain name
112 * given a sockaddr_in with an IP address.
113 *
114 * Arguments:
115 * p pointer to sockaddr_in with an IP address
116 *
117 * Returns:
118 * char * pointer to a text-formatted string
119 *
120 */
121char *
d797dc5d 122format_ip_addr(struct in_addr *addr)
984263bc 123{
f2c0a431 124 static char host_name[MAXHOSTNAMELEN + 18];
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125 char *ip_num;
126 struct hostent *ip_host;
127
128 /*
129 * Initialize
130 */
131 UM_ZERO(host_name, sizeof(host_name));
132
133 /*
134 * Check for a zero address
135 */
136 if (!addr || addr->s_addr == 0) {
137 return("-");
138 }
139
140 /*
141 * Get address in dotted decimal format
142 */
143 ip_num = inet_ntoa(*addr);
144
145 /*
146 * Look up name in DNS
147 */
15b85273 148 ip_host = gethostbyaddr(addr, sizeof(addr), AF_INET);
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149 if (ip_host && ip_host->h_name &&
150 strlen(ip_host->h_name)) {
151 /*
152 * Return host name followed by dotted decimal address
153 */
f2c0a431
SU
154 snprintf(host_name, sizeof(host_name), "%s (%s)",
155 ip_host->h_name, ip_num);
156 return (host_name);
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157 } else {
158 /*
159 * No host name -- just return dotted decimal address
160 */
161 return(ip_num);
162 }
163}