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