Fix more wrong sizeof() usages, part 1/x
[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 $
27 *
28 */
29
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30/*
31 * User Space Library Functions
32 * ----------------------------
33 *
34 * IP address utilities
35 *
36 */
37
38#include <sys/types.h>
39#include <sys/param.h>
40#include <sys/socket.h>
41#include <net/if.h>
42#include <netinet/in.h>
43#include <arpa/inet.h>
44#include <netatm/port.h>
45#include <netatm/atm.h>
46#include <netatm/atm_if.h>
47#include <netatm/atm_sap.h>
48#include <netatm/atm_sys.h>
49#include <netatm/atm_ioctl.h>
50
51#include <netdb.h>
7bc7e232 52#include <stdio.h>
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53#include <string.h>
54
55#include "libatm.h"
56
57/*
58 * Get IP address
59 *
60 * Return an IP address in a socket address structure, given a character
61 * string with a domain name or a dotted decimal number.
62 *
63 * Arguments:
64 * p pointer to a host name or IP address
65 *
66 * Returns:
67 * null error was encountered
68 * struct sockaddr_in * a pointer to a socket address with the
69 * requested IP address
70 *
71 */
72struct sockaddr_in *
d797dc5d 73get_ip_addr(char *p)
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74{
75 struct hostent *ip_host;
76 static struct sockaddr_in sin;
77
78 /*
79 * Get IP address of specified host name
80 */
81 UM_ZERO(&sin, sizeof(sin));
82 sin.sin_family = AF_INET;
83 if (p[0] >= '0' && p[0] <= '9') {
84 /*
85 * IP address is in dotted decimal format
86 */
87 if ((sin.sin_addr.s_addr = inet_addr(p)) == -1) {
60233e58 88 return(NULL);
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89 }
90 } else {
91 /*
92 * Host name is in domain name system format
93 */
94 ip_host = gethostbyname(p);
95 if (!ip_host ||
96 ip_host->h_addrtype != AF_INET) {
60233e58 97 return(NULL);
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98 }
99 sin.sin_addr.s_addr = *(u_long *)ip_host->h_addr_list[0];
100 }
101 return(&sin);
102}
103
104
105/*
106 * Format an IP address
107 *
108 * Return a text-formatted string with an IP address and domain name
109 * given a sockaddr_in with an IP address.
110 *
111 * Arguments:
112 * p pointer to sockaddr_in with an IP address
113 *
114 * Returns:
115 * char * pointer to a text-formatted string
116 *
117 */
118char *
d797dc5d 119format_ip_addr(struct in_addr *addr)
984263bc 120{
f2c0a431 121 static char host_name[MAXHOSTNAMELEN + 18];
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122 char *ip_num;
123 struct hostent *ip_host;
124
125 /*
126 * Initialize
127 */
128 UM_ZERO(host_name, sizeof(host_name));
129
130 /*
131 * Check for a zero address
132 */
133 if (!addr || addr->s_addr == 0) {
134 return("-");
135 }
136
137 /*
138 * Get address in dotted decimal format
139 */
140 ip_num = inet_ntoa(*addr);
141
142 /*
143 * Look up name in DNS
144 */
8075c3b8 145 ip_host = gethostbyaddr(addr, sizeof(*addr), AF_INET);
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146 if (ip_host && ip_host->h_name &&
147 strlen(ip_host->h_name)) {
148 /*
149 * Return host name followed by dotted decimal address
150 */
f2c0a431
SU
151 snprintf(host_name, sizeof(host_name), "%s (%s)",
152 ip_host->h_name, ip_num);
153 return (host_name);
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154 } else {
155 /*
156 * No host name -- just return dotted decimal address
157 */
158 return(ip_num);
159 }
160}