Merge branch 'vendor/GCC44'
[dragonfly.git] / bin / hostname / hostname.c
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.
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 $
36  */
37
38 #include <sys/param.h>
39 #include <sys/ioctl.h>
40 #include <sys/socket.h>
41 #include <sys/sysctl.h>
42 #include <sys/module.h>
43 #include <sys/linker.h>
44
45 #include <net/ethernet.h>
46 #include <net/if.h>
47 #include <net/if_var.h>
48 #include <net/if_dl.h>
49 #include <net/if_types.h>
50 #include <net/route.h>
51 #include <netinet/in.h>
52
53 #include <err.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58
59 #include <netdb.h>
60 #include <sys/types.h>
61 #include <arpa/inet.h>
62
63 #include <errno.h>
64
65 #define HST_IF    (1 << 0)
66 #define HST_IF_V6 (1 << 1)
67 #define HST_IF_V4 (1 << 2)
68
69
70
71 /*
72  * Expand the compacted form of addresses as returned via the
73  * configuration read via sysctl().
74  * Lifted from getifaddrs(3)
75  */
76
77 static void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
78 static void usage (void);
79
80 #define ROUNDUP(a) \
81         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
82 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
83
84 static
85 void
86 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
87 {
88         struct sockaddr *sa;
89         int i;
90
91         memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
92         for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
93                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
94                         continue;
95                 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
96                 ADVANCE(cp, sa);
97         }
98 }
99
100 int
101 main(int argc, char **argv)
102 {
103         int ch, sflag, rflag, ret, flag6, iflag;
104         int silen = 0;
105         char hostname[MAXHOSTNAMELEN];
106         char *srflag, *siflag;
107         struct hostent *hst;
108         struct in_addr ia;
109         struct in6_addr ia6;
110
111         int mib[6];
112         size_t needed;
113         char *buf, *next, *p;
114         int idx;
115         struct sockaddr_dl *sdl;
116         struct rt_msghdr *rtm;
117         struct if_msghdr *ifm;
118         struct ifa_msghdr *ifam;
119         struct rt_addrinfo info;
120         struct sockaddr_in *sai;
121         struct sockaddr_in6 *sai6;
122
123         srflag = NULL;
124         siflag = NULL;
125         iflag = sflag = rflag = 0;
126         flag6 = 0;
127         hst = NULL;
128
129         while ((ch = getopt(argc, argv, "46i:r:s")) != -1) {
130                 switch (ch) {
131                 case '4':
132                         iflag |= HST_IF_V4;
133                         break;
134                 case '6':
135                         iflag |= HST_IF_V6;
136                         break;
137                 case 'i':
138                         siflag = optarg;
139                         silen = strlen(siflag);
140                         iflag |= HST_IF;
141                         break;
142                 case 'r':
143                         srflag = optarg;
144                         rflag = 1;
145                         break;
146                 case 's':
147                         sflag = 1;
148                         break;
149                 default:
150                         usage();
151                 }
152         }
153         argc -= optind;
154         argv += optind;
155
156         if (argc > 1)
157                 usage();
158
159         if (iflag && *argv)
160                 usage();
161
162         if (rflag && *argv)
163                 usage();
164
165         if (rflag && (iflag & HST_IF))
166                 usage();
167
168         if ((iflag & HST_IF_V6) && (iflag & HST_IF_V4))
169                 usage();
170
171         if (!(iflag & HST_IF) && ((iflag & HST_IF_V6)||iflag & HST_IF_V4))
172                 usage();
173
174         if (iflag & HST_IF) {
175                 mib[0] = CTL_NET;
176                 mib[1] = PF_ROUTE;
177                 mib[2] = 0;
178                 mib[3] = 0;
179                 mib[4] = NET_RT_IFLIST;
180                 mib[5] = 0;
181
182                 idx = 0;
183                 needed = 1;
184
185                 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
186                         err(1, "sysctl: iflist-sysctl-estimate");
187                 if ((buf = malloc(needed)) == NULL)
188                         err(1, "malloc failed");
189                 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
190                         err(1, "sysctl: retrieval of interface table");
191         
192                 for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
193                         rtm = (struct rt_msghdr *)(void *)next;
194                         if (rtm->rtm_version != RTM_VERSION)
195                                 continue;
196                         switch (rtm->rtm_type) {
197                         case RTM_IFINFO:
198                                 ifm = (struct if_msghdr *)(void *)rtm;
199
200                                 if ((ifm->ifm_addrs & RTA_IFP) == 0)
201                                         break;
202                                 sdl = (struct sockaddr_dl *)(ifm + 1);
203                                 if (silen != sdl->sdl_nlen)
204                                         break;
205                                 if (!strncmp(siflag, sdl->sdl_data, silen)) {
206                                         idx = ifm->ifm_index;
207                                 }
208                                 break;
209                         case RTM_NEWADDR:
210                                 ifam = (struct ifa_msghdr *)(void *)rtm;
211
212                                 if (ifam->ifam_index == idx) {
213                                         info.rti_addrs = ifam->ifam_addrs;
214                                         rt_xaddrs((char *)(ifam + 1),
215                                                 ifam->ifam_msglen + (char *)ifam, &info);
216                                         sai = (struct sockaddr_in *)info.rti_info[RTAX_IFA];
217
218                                         if (iflag & HST_IF_V6) {
219                                                 if (sai->sin_family == AF_INET6) {
220                                                         sai6 = (struct sockaddr_in6 *)info.rti_info[RTAX_IFA];
221                                                         hst = gethostbyaddr(&sai6->sin6_addr,
222                                                                         sizeof(sai6->sin6_addr),AF_INET6);
223
224                                                         if (h_errno == NETDB_SUCCESS) {
225                                                                 next = buf + needed;
226                                                                 continue;
227                                                         }
228                                                 }
229                                         } else {
230                                                 if ((sai->sin_family == AF_INET)) {
231
232                                                         hst = gethostbyaddr(&sai->sin_addr,
233                                                                         sizeof(sai->sin_addr),AF_INET);
234
235                                                         if (h_errno == NETDB_SUCCESS) {
236                                                                 next = buf + needed;
237                                                                 continue;
238                                                         }
239                                                 }
240                                         }
241                                 }
242                                 break;
243                         } /* switch */
244                 } /* loop */
245
246                 free(buf);
247
248                 if (idx == 0)
249                         errx(1,"interface not found");
250                 if (hst == NULL)
251                         errx(1, "ip not found on interface");
252
253                 if (h_errno == NETDB_SUCCESS) {
254                         if (sethostname(hst->h_name, (int)strlen(hst->h_name)))
255                                 err(1, "sethostname");
256                 } else if (h_errno == HOST_NOT_FOUND) {
257                         errx(1,"hostname not found");
258                 } else {
259                         herror("gethostbyaddr");
260                         exit(1);
261                 }
262         } else if (rflag) {
263                 ret = inet_pton(AF_INET, srflag, &ia);
264                 if (ret != 1) {
265                         /* check IPV6 */
266                         ret = inet_pton(AF_INET6, srflag, &ia6);
267
268                         if (ret != 1) {
269                                 errx(1, "invalid ip address");
270                         }
271
272                         flag6 = 1;
273                 }
274                 
275                 if (flag6 == 1) 
276                         hst = gethostbyaddr(&ia6, sizeof(ia6), AF_INET6);
277                 else
278                         hst = gethostbyaddr(&ia, sizeof(ia), AF_INET);
279                 if (!hst) {
280                         if (h_errno == HOST_NOT_FOUND) 
281                                 errx(1,"host not found\n");
282                 }
283
284                 if (sethostname(hst->h_name, (int)strlen(hst->h_name)))
285                         err(1, "sethostname");
286         } else if (*argv) {
287                 if (sethostname(*argv, (int)strlen(*argv)))
288                         err(1, "sethostname");
289         } else {
290                 if (gethostname(hostname, (int)sizeof(hostname)))
291                         err(1, "gethostname");
292                 if (sflag && (p = strchr(hostname, '.')))
293                         *p = '\0';
294                 printf("%s\n", hostname);
295         }
296         exit(0);
297 }
298
299 static void
300 usage(void)
301 {
302         fprintf(stderr, "usage: hostname [-s] [name-of-host |"
303                         " -r ip-address | -i interface [-4 | -6]]\n");
304         exit(1);
305 }
306