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
27 #include <sys/param.h>
28 #include <sys/wait.h>
29 #include <sys/stat.h>
30 #include <sys/resident.h>
31 #include <sys/sysctl.h>
32
33 #include <machine/elf.h>
34 #include <dlfcn.h>
35 #include <err.h>
36 #include <fcntl.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <unistd.h>
40 #include <string.h>
41 #include <errno.h>
42
43 static void
usage(void)44 usage(void)
45 {
46 fprintf(stderr, "usage: resident [-l] [-f] [-x id] [-d] [-R] program ...\n");
47 exit(1);
48 }
49
50 static int
list_residents(void)51 list_residents(void)
52 {
53 const char *mib = "vm.resident";
54 struct xresident *buf;
55 size_t res_count, res_total, i;
56 int error;
57
58 /* get the number of resident binaries */
59 error = sysctlbyname(mib, NULL, &res_count, NULL, 0);
60 if (error != 0) {
61 perror("sysctl: vm.resident");
62 goto done;
63 }
64
65 if (res_count == 0) {
66 printf("no resident binaries to list\n");
67 goto done;
68 }
69
70 /* allocate memory for the list of binaries */
71 res_total = sizeof(*buf) * res_count;
72 if ((buf = malloc(res_total)) != NULL) {
73 /* retrieve entries via sysctl */
74 error = sysctlbyname(mib, buf, &res_total, NULL, 0);
75 if (error != 0) {
76 perror("sysctl: vm.resident");
77 goto done;
78 }
79 } else {
80 perror("malloc");
81 goto done;
82 }
83
84 /* print the list of retrieved resident binary */
85 printf("%-4s\t%-15s\t%-12s\t%-30s\n","Id", "Size", "Address", "Executable");
86 for (i = 0; i < res_count; ++i) {
87 printf("%-4d\t%-15jd\t0x%-12x\t%-30s\n",
88 buf[i].res_id,
89 (intmax_t)buf[i].res_stat.st_size,
90 (int)buf[i].res_entry_addr,
91 buf[i].res_file);
92 }
93
94 /* free back the memory */
95 free(buf);
96
97 done:
98 return error;
99 }
100
101 int
main(int argc,char * argv[])102 main(int argc, char *argv[])
103 {
104 int rval;
105 int c;
106 int doreg = 1;
107 int force = 0;
108
109 while ((c = getopt(argc, argv, "Rdflx:")) != -1) {
110 switch (c) {
111 case 'f':
112 force = 1;
113 break;
114 case 'l':
115 rval = list_residents();
116 if (rval < 0)
117 exit(EXIT_FAILURE);
118 else
119 exit(EXIT_SUCCESS);
120 case 'd':
121 doreg = 0;
122 break;
123 case 'x':
124 case 'R':
125 if (c == 'R')
126 c = exec_sys_unregister(-2);
127 else
128 c = exec_sys_unregister(strtol(optarg, NULL, 0));
129 if (c < 0)
130 printf("unregister: %s\n", strerror(errno));
131 else
132 printf("unregister: success\n");
133 exit(0);
134 default:
135 usage();
136 /*NOTREACHED*/
137 }
138 }
139 argc -= optind;
140 argv += optind;
141
142 if (argc <= 0) {
143 usage();
144 /*NOTREACHED*/
145 }
146
147 /* ld-elf.so magic */
148 if (doreg) {
149 if (setenv("LD_RESIDENT_REGISTER_NOW", "yes", 1) == -1)
150 err(1, "setenv failed");
151 } else {
152 if (setenv("LD_RESIDENT_UNREGISTER_NOW", "yes", 1) == -1)
153 err(1, "setenv failed");
154 }
155
156 rval = 0;
157 for ( ; argc > 0; argc--, argv++) {
158 int fd;
159 union {
160 Elf_Ehdr elf;
161 } hdr;
162 int n;
163 int status;
164 int file_ok;
165 int is_shlib;
166
167 if (force)
168 goto force_target;
169
170 if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
171 warn("%s", *argv);
172 rval |= 1;
173 continue;
174 }
175 if ((n = read(fd, &hdr, sizeof hdr)) == -1) {
176 warn("%s: can't read program header", *argv);
177 close(fd);
178 rval |= 1;
179 continue;
180 }
181
182 file_ok = 1;
183 is_shlib = 0;
184 if ((size_t)n >= sizeof hdr.elf && IS_ELF(hdr.elf)) {
185 Elf_Ehdr ehdr;
186 Elf_Phdr phdr;
187 int dynamic = 0, i;
188
189 if (lseek(fd, 0, SEEK_SET) == -1 ||
190 read(fd, &ehdr, sizeof ehdr) != sizeof ehdr ||
191 lseek(fd, ehdr.e_phoff, SEEK_SET) == -1
192 ) {
193 warnx("%s: can't read program header", *argv);
194 file_ok = 0;
195 } else {
196 for (i = 0; i < ehdr.e_phnum; i++) {
197 if (read(fd, &phdr, ehdr.e_phentsize)
198 != sizeof phdr) {
199 warnx("%s: can't read program header",
200 *argv);
201 file_ok = 0;
202 break;
203 }
204 if (phdr.p_type == PT_DYNAMIC)
205 dynamic = 1;
206 }
207 }
208 if (!dynamic) {
209 warnx("%s: not a dynamic executable", *argv);
210 file_ok = 0;
211 } else if (hdr.elf.e_type == ET_DYN) {
212 if (hdr.elf.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) {
213 is_shlib = 1;
214 } else {
215 warnx("%s: not a FreeBSD ELF shared "
216 "object", *argv);
217 file_ok = 0;
218 }
219 }
220 } else {
221 warnx("%s: not a dynamic executable", *argv);
222 file_ok = 0;
223 }
224 close(fd);
225 if (!file_ok) {
226 rval |= 1;
227 continue;
228 }
229
230 if (is_shlib) {
231 rval |= 1;
232 warnx("%s: resident not supported on shared libraries.", *argv);
233 continue;
234 }
235
236 force_target:
237 fflush(stdout);
238
239 switch (fork()) {
240 case -1:
241 err(1, "fork");
242 break;
243 default:
244 if (wait(&status) <= 0) {
245 warn("wait");
246 rval |= 1;
247 } else if (WIFSIGNALED(status)) {
248 fprintf(stderr, "%s: signal %d\n",
249 *argv, WTERMSIG(status));
250 rval |= 1;
251 } else if (WIFEXITED(status) && WEXITSTATUS(status)) {
252 switch(WEXITSTATUS(status)) {
253 case ENOENT:
254 fprintf(stderr, "%s: entry not found\n",
255 *argv);
256 break;
257 case EEXIST:
258 fprintf(stderr, "%s: binary already resident\n",
259 *argv);
260 break;
261 default:
262 fprintf(stderr, "%s: exit status %s\n",
263 *argv, strerror(WEXITSTATUS(status)));
264 }
265 rval |= 1;
266 } else {
267 }
268 break;
269 case 0:
270 execl(*argv, *argv, NULL);
271 warn("%s", *argv);
272 _exit(1);
273 }
274 }
275
276 return rval;
277 }
278