827b1a51c9908519729d9264565f6bfcc6019c21
[dragonfly.git] / usr.sbin / resident / resident.c
1 /*
2  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
3  * 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  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $DragonFly: src/usr.sbin/resident/resident.c,v 1.8 2005/04/22 16:59:46 liamfoy Exp $
27  */
28
29 #include <sys/cdefs.h>
30
31 #include <sys/param.h>
32 #include <sys/wait.h>
33 #include <sys/stat.h>
34 #include <sys/resident.h>
35 #include <sys/sysctl.h>
36
37 #include <machine/elf.h>
38 #include <a.out.h>
39 #include <dlfcn.h>
40 #include <err.h>
41 #include <fcntl.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <string.h>
46 #include <errno.h>
47
48 static void
49 usage(void)
50 {
51         fprintf(stderr, "usage: resident [-l] [-f] [-x id] [-d] [-R] program ...\n");
52         exit(1);
53 }
54
55 static int
56 list_residents(void)
57 {
58         const char *mib = "vm.resident";
59         struct xresident *buf;
60         size_t res_count, res_total;
61         int error, i;
62
63         /* get the number of resident binaries */
64         error = sysctlbyname(mib, NULL, &res_count, NULL, 0);
65         if (error != 0) {
66                 perror("sysctl: vm.resident");
67                 goto done;
68         }
69
70         if (res_count == 0) {
71                 printf("no resident binaries to list\n");
72                 goto done;
73         }
74
75         /* allocate memory for the list of binaries */
76         res_total = sizeof(*buf) * res_count;
77         if ((buf = malloc(res_total)) != NULL) {
78                 /* retrieve entries via sysctl */
79                 error = sysctlbyname(mib, buf, &res_total, NULL, 0);
80                 if (error != 0) {
81                         perror("sysctl: vm.resident");
82                         goto done;
83                 }
84         } else {
85                 perror("malloc");
86                 goto done;
87         }
88         
89         /* print the list of retrieved resident binary */
90         printf("%-4s\t%-15s\t%-12s\t%-30s\n","Id", "Size", "Address", "Executable");
91         for (i = 0; i < res_count; ++i) {
92                 printf("%-4d\t%-15lld\t0x%-12x\t%-30s\n",
93                         buf[i].res_id,
94                         buf[i].res_stat.st_size,
95                         buf[i].res_entry_addr,
96                         buf[i].res_file);
97         }
98
99         /* free back the memory */
100         free(buf);
101
102 done:
103         return error;
104 }
105
106 int
107 main(int argc, char *argv[])
108 {
109         int     rval;
110         int     c;
111         int     doreg = 1;
112         int     force = 0;
113
114         while ((c = getopt(argc, argv, "Rdflx:")) != -1) {
115                 switch (c) {
116                 case 'f':
117                         force = 1;
118                         break;
119                 case 'l':
120                         rval = list_residents();
121                         if (rval < 0)
122                                 exit(EXIT_FAILURE);
123                         else
124                                 exit(EXIT_SUCCESS);
125                 case 'd':
126                         doreg = 0;
127                         break;
128                 case 'x':
129                 case 'R':
130                         if (c == 'R')
131                             c = exec_sys_unregister(-2);
132                         else
133                             c = exec_sys_unregister(strtol(optarg, NULL, 0));
134                         if (c < 0)
135                             printf("unregister: %s\n", strerror(errno));
136                         else
137                             printf("unregister: success\n");
138                         exit(0);
139                 default:
140                         usage();
141                         /*NOTREACHED*/
142                 }
143         }
144         argc -= optind;
145         argv += optind;
146
147         if (argc <= 0) {
148                 usage();
149                 /*NOTREACHED*/
150         }
151
152         /* ld-elf.so magic */
153         if (doreg) {
154             if (setenv("LD_RESIDENT_REGISTER_NOW", "yes", 1) == -1)
155                         err(1, "setenv failed");
156         } else {
157             if (setenv("LD_RESIDENT_UNREGISTER_NOW", "yes", 1) == -1)
158                         err(1, "setenv failed");
159         }
160
161         rval = 0;
162         for ( ;  argc > 0;  argc--, argv++) {
163                 int     fd;
164                 union {
165                         struct exec aout;
166                         Elf_Ehdr elf;
167                 } hdr;
168                 int     n;
169                 int     status;
170                 int     file_ok;
171                 int     is_shlib;
172
173                 if (force)
174                         goto force_target;
175
176                 if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
177                         warn("%s", *argv);
178                         rval |= 1;
179                         continue;
180                 }
181                 if ((n = read(fd, &hdr, sizeof hdr)) == -1) {
182                         warn("%s: can't read program header", *argv);
183                         close(fd);
184                         rval |= 1;
185                         continue;
186                 }
187
188                 file_ok = 1;
189                 is_shlib = 0;
190                 if ((size_t)n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) {
191                         /* a.out file */
192                         if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
193 #if 1 /* Compatibility */
194                             || hdr.aout.a_entry < __LDPGSZ
195 #endif
196                                 ) {
197                                 warnx("%s: not a dynamic executable", *argv);
198                                 file_ok = 0;
199                         }
200                 } else if ((size_t)n >= sizeof hdr.elf && IS_ELF(hdr.elf)) {
201                         Elf_Ehdr ehdr;
202                         Elf_Phdr phdr;
203                         int dynamic = 0, i;
204
205                         if (lseek(fd, 0, SEEK_SET) == -1 ||
206                             read(fd, &ehdr, sizeof ehdr) != sizeof ehdr ||
207                             lseek(fd, ehdr.e_phoff, SEEK_SET) == -1
208                            ) {
209                                 warnx("%s: can't read program header", *argv);
210                                 file_ok = 0;
211                         } else {
212                                 for (i = 0; i < ehdr.e_phnum; i++) {
213                                         if (read(fd, &phdr, ehdr.e_phentsize)
214                                            != sizeof phdr) {
215                                                 warnx("%s: can't read program header",
216                                                     *argv);
217                                                 file_ok = 0;
218                                                 break;
219                                         }
220                                         if (phdr.p_type == PT_DYNAMIC)
221                                                 dynamic = 1;
222                                 }
223                         }
224                         if (!dynamic) {
225                                 warnx("%s: not a dynamic executable", *argv);
226                                 file_ok = 0;
227                         } else if (hdr.elf.e_type == ET_DYN) {
228                                 if (hdr.elf.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) {
229                                         is_shlib = 1;
230                                 } else {
231                                         warnx("%s: not a FreeBSD ELF shared "
232                                               "object", *argv);
233                                         file_ok = 0;
234                                 }
235                         }
236                 } else {
237                         warnx("%s: not a dynamic executable", *argv);
238                         file_ok = 0;
239                 }
240                 close(fd);
241                 if (!file_ok) {
242                         rval |= 1;
243                         continue;
244                 }
245
246                 if (is_shlib) {
247                         rval |= 1;
248                         warnx("%s: resident not supported on shared libraries.", *argv);
249                         continue;
250                 }
251
252 force_target:
253                 fflush(stdout);
254
255                 switch (fork()) {
256                 case -1:
257                         err(1, "fork");
258                         break;
259                 default:
260                         if (wait(&status) <= 0) {
261                                 warn("wait");
262                                 rval |= 1;
263                         } else if (WIFSIGNALED(status)) {
264                                 fprintf(stderr, "%s: signal %d\n",
265                                                 *argv, WTERMSIG(status));
266                                 rval |= 1;
267                         } else if (WIFEXITED(status) && WEXITSTATUS(status)) {
268                                 switch(WEXITSTATUS(status)) {
269                                 case ENOENT:
270                                     fprintf(stderr, "%s: entry not found\n",
271                                         *argv);
272                                     break;
273                                 case EEXIST:
274                                     fprintf(stderr, "%s: binary already resident\n",
275                                         *argv);
276                                     break;
277                                 default:
278                                     fprintf(stderr, "%s: exit status %s\n",
279                                                 *argv, strerror(WEXITSTATUS(status)));
280                                 }
281                                 rval |= 1;
282                         } else {
283                         }
284                         break;
285                 case 0:
286                         execl(*argv, *argv, NULL);
287                         warn("%s", *argv);
288                         _exit(1);
289                 }
290         }
291
292         return rval;
293 }