Remove not needed void casts.
[dragonfly.git] / bin / hostname / hostname.c
CommitLineData
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1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)hostname.c 8.1 (Berkeley) 5/31/93
35 * $FreeBSD: src/bin/hostname/hostname.c,v 1.10.2.1 2001/08/01 02:40:23 obrien Exp $
57fed2af 36 * $DragonFly: src/bin/hostname/hostname.c,v 1.12 2004/11/07 20:54:51 eirikn Exp $
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37 */
38
984263bc 39#include <sys/param.h>
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40#include <sys/ioctl.h>
41#include <sys/socket.h>
42#include <sys/sysctl.h>
43#include <sys/time.h>
44#include <sys/module.h>
45#include <sys/linker.h>
46
47
48#include <net/ethernet.h>
49#include <net/if.h>
50#include <net/if_var.h>
51#include <net/if_dl.h>
52#include <net/if_types.h>
53#include <net/route.h>
54#include <netinet/in.h>
55
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56
57#include <err.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62
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63#include <netdb.h>
64#include <sys/types.h>
65#include <netinet/in.h>
66#include <arpa/inet.h>
67
68#include <errno.h>
69
70#define HST_IF (1 << 0)
71#define HST_IF_V6 (1 << 1)
72#define HST_IF_V4 (1 << 2)
73
74
75
76/*
77 * Expand the compacted form of addresses as returned via the
78 * configuration read via sysctl().
79 * Lifted from getifaddrs(3)
80 */
81
82static void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
83static void usage (void);
84
85#define ROUNDUP(a) \
86 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
87#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
88
89static
90void
91rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
92{
93 struct sockaddr *sa;
94 int i;
95
96 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
97 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
98 if ((rtinfo->rti_addrs & (1 << i)) == 0)
99 continue;
100 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
101 ADVANCE(cp, sa);
102 }
103}
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104
105int
b5744197 106main(int argc, char **argv)
984263bc 107{
baa0803f 108 int ch, sflag, rflag, ret, flag6, iflag;
b4035d96 109 int silen = 0;
639b96ab 110 char hostname[MAXHOSTNAMELEN];
baa0803f 111 char *srflag, *siflag;
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112 struct hostent *hst;
113 struct in_addr ia;
114 struct in6_addr ia6;
115
116 int mib[6];
a78cd756 117 size_t needed;
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118 char *buf,*lim,*next,*p;
119 int idx;
120 struct sockaddr_dl *sdl;
121 struct rt_msghdr *rtm;
122 struct if_msghdr *ifm;
123 struct ifa_msghdr *ifam;
124 struct rt_addrinfo info;
125 struct sockaddr_in *sai;
126 struct sockaddr_in6 *sai6;
127
128 srflag = NULL;
baa0803f 129 siflag = NULL;
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130 iflag = sflag = rflag = 0;
131 flag6 = 0;
132 hst = NULL;
984263bc 133
639b96ab 134 while ((ch = getopt(argc, argv, "46i:r:s")) != -1) {
984263bc 135 switch (ch) {
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136 case '4':
137 iflag |= HST_IF_V4;
138 break;
139 case '6':
140 iflag |= HST_IF_V6;
141 break;
142 case 'i':
f9b04e01 143 siflag = strdup(optarg);
2a50c533 144 silen = strlen(siflag);
f9b04e01 145 iflag |= HST_IF;
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146 break;
147 case 'r':
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148 srflag = strdup(optarg);
149 rflag = 1;
639b96ab 150 break;
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151 case 's':
152 sflag = 1;
153 break;
154 case '?':
155 default:
156 usage();
157 }
639b96ab 158 }
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159 argc -= optind;
160 argv += optind;
161
162 if (argc > 1)
163 usage();
164
f9b04e01 165 if (iflag && *argv)
639b96ab 166 usage();
639b96ab 167
f9b04e01 168 if (rflag && *argv)
639b96ab 169 usage();
639b96ab 170
f9b04e01 171 if (rflag && (iflag & HST_IF))
639b96ab 172 usage();
639b96ab 173
f9b04e01 174 if ((iflag & HST_IF_V6) && (iflag & HST_IF_V4))
639b96ab 175 usage();
639b96ab 176
f9b04e01 177 if (!(iflag & HST_IF) && ((iflag & HST_IF_V6)||iflag & HST_IF_V4))
639b96ab 178 usage();
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179
180 if (iflag & HST_IF) {
181 mib[0] = CTL_NET;
182 mib[1] = PF_ROUTE;
183 mib[2] = 0;
184 mib[3] = 0;
185 mib[4] = NET_RT_IFLIST;
186 mib[5] = 0;
187
188 idx = 0;
189 needed = 1;
190
f9b04e01 191 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
639b96ab 192 errx(1, "iflist-sysctl-estimate:%i",errno);
f9b04e01 193 if ((buf = malloc(needed)) == NULL)
639b96ab 194 errx(1, "malloc");
f9b04e01 195 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
639b96ab 196 errx(1, "actual retrieval of interface table");
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197
198 lim = buf + needed;
199
200 for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
201 rtm = (struct rt_msghdr *)(void *)next;
202 if (rtm->rtm_version != RTM_VERSION)
203 continue;
204 switch (rtm->rtm_type) {
205 case RTM_IFINFO:
206 ifm = (struct if_msghdr *)(void *)rtm;
207
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208 if ((ifm->ifm_addrs & RTA_IFP) == 0)
209 break;
210 sdl = (struct sockaddr_dl *)(ifm + 1);
211 if (silen != sdl->sdl_nlen)
212 break;
213 if (!strncmp(siflag, sdl->sdl_data, silen)) {
214 idx = ifm->ifm_index;
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215 }
216 break;
217 case RTM_NEWADDR:
218 ifam = (struct ifa_msghdr *)(void *)rtm;
219
220 if (ifam->ifam_index == idx) {
221 info.rti_addrs = ifam->ifam_addrs;
222 rt_xaddrs((char *)(ifam + 1),
223 ifam->ifam_msglen + (char *)ifam, &info);
224 sai = (struct sockaddr_in *)info.rti_info[RTAX_IFA];
225
226 if (iflag & HST_IF_V6) {
227 if (sai->sin_family == AF_INET6) {
228 sai6 = (struct sockaddr_in6 *)info.rti_info[RTAX_IFA];
229 hst = gethostbyaddr((const char*)&sai6->sin6_addr,
230 sizeof(sai6->sin6_addr),AF_INET6);
231
232 if (h_errno == NETDB_SUCCESS) {
233 next = buf + needed;
234 continue;
235 }
236 }
237 } else {
238 if ((sai->sin_family == AF_INET)) {
239
240 hst = gethostbyaddr((const char*)&sai->sin_addr,
241 sizeof(sai->sin_addr),AF_INET);
242
243 if (h_errno == NETDB_SUCCESS) {
244 next = buf + needed;
245 continue;
246 }
247 }
248 }
249 }
250 break;
251 } /* switch */
252 } /* loop */
253
254 free(buf);
639b96ab 255
f9b04e01 256 if (idx == 0)
639b96ab 257 errx(1,"interface not found");
f9b04e01 258 if (hst == NULL)
5213f566 259 errx(1, "ip not found on interface");
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260
261 if (h_errno == NETDB_SUCCESS) {
262 if (sethostname(hst->h_name, (int)strlen(hst->h_name)))
263 errx(1, "sethostname");
264 } else if (h_errno == HOST_NOT_FOUND) {
265 errx(1,"hostname not found");
266 } else {
267 errx(1,"gethostbyaddr");
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268 }
269 } else if (rflag) {
270 ret = inet_pton(AF_INET, srflag, &ia);
271 if (ret != 1) {
a78cd756 272 /* check IPV6 */
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273 ret = inet_pton(AF_INET6, srflag, &ia6);
274
275 if (ret != 1) {
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276 errx(1, "invalid ip address");
277 }
278
279 flag6 = 1;
280 }
281
282 if (flag6 == 1)
283 hst = gethostbyaddr((const char*)&ia6, sizeof(ia6), AF_INET6);
284 else
285 hst = gethostbyaddr((const char*)&ia, sizeof(ia), AF_INET);
286 if (!hst) {
f9b04e01 287 if (h_errno == HOST_NOT_FOUND)
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288 errx(1,"host not found\n");
289 }
290
291 if (sethostname(hst->h_name, (int)strlen(hst->h_name)))
292 err(1, "sethostname");
293 } else if (*argv) {
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294 if (sethostname(*argv, (int)strlen(*argv)))
295 err(1, "sethostname");
296 } else {
297 if (gethostname(hostname, (int)sizeof(hostname)))
298 err(1, "gethostname");
299 if (sflag && (p = strchr(hostname, '.')))
300 *p = '\0';
57fed2af 301 printf("%s\n", hostname);
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302 }
303 exit(0);
304}
305
639b96ab 306static void
b5744197 307usage(void)
984263bc 308{
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309 fprintf(stderr, "usage: hostname [-s] [name-of-host |"
310 " -r ip-address | -i interface [-4 | -6]]\n");
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311 exit(1);
312}
639b96ab 313