1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1992, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
41 #endif /* not lint */
42 #endif
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 /*
47 * Originally written by Eric Cooper in Fall 1981.
48 * Inspired by a version 6 program by Len Levin, 1978.
49 * Several pieces of code lifted from Bill Joy's 4BSD ps.
50 * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
51 * Lawrence Berkeley Laboratory.
52 *
53 * Portions of this software were developed by the Computer Systems
54 * Engineering group at Lawrence Berkeley Laboratory under DARPA
55 * contract BG 91-66 and contributed to Berkeley.
56 */
57
58 #include <sys/param.h>
59 #include <sys/ptrace.h>
60 #include <sys/time.h>
61 #include <sys/stat.h>
62 #include <sys/linker_set.h>
63 #include <sys/sysctl.h>
64 #include <sys/wait.h>
65
66 #include <err.h>
67 #include <fcntl.h>
68 #include <stdbool.h>
69 #include <stdio.h>
70 #include <stdlib.h>
71 #include <string.h>
72 #include <unistd.h>
73
74 #include "extern.h"
75 int pflags;
76
77 static void killed(int);
78 static void usage(void) __dead2;
79
80 static pid_t pid;
81 static bool kflag = false;
82
83 SET_DECLARE(dumpset, struct dumpers);
84
85 static int
open_corefile(char * corefile)86 open_corefile(char *corefile)
87 {
88 char fname[MAXPATHLEN];
89 int fd;
90
91 if (corefile == NULL) {
92 (void)snprintf(fname, sizeof(fname), "core.%d", pid);
93 corefile = fname;
94 }
95 fd = open(corefile, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE);
96 if (fd < 0)
97 err(1, "%s", corefile);
98 return (fd);
99 }
100
101 static void
kcoredump(int fd,pid_t pid)102 kcoredump(int fd, pid_t pid)
103 {
104 struct ptrace_coredump pc;
105 int error, res, ret, waited;
106
107 error = ptrace(PT_ATTACH, pid, NULL, 0);
108 if (error != 0)
109 err(1, "attach");
110
111 waited = waitpid(pid, &res, 0);
112 if (waited == -1)
113 err(1, "wait for STOP");
114
115 ret = 0;
116 memset(&pc, 0, sizeof(pc));
117 pc.pc_fd = fd;
118 pc.pc_flags = (pflags & PFLAGS_FULL) != 0 ? PC_ALL : 0;
119 error = ptrace(PT_COREDUMP, pid, (void *)&pc, sizeof(pc));
120 if (error == -1) {
121 warn("coredump");
122 ret = 1;
123 }
124
125 waited = waitpid(pid, &res, WNOHANG);
126 if (waited == -1) {
127 warn("wait after coredump");
128 ret = 1;
129 }
130
131 error = ptrace(PT_DETACH, pid, NULL, 0);
132 if (error == -1) {
133 warn("detach failed, check process status");
134 ret = 1;
135 }
136
137 exit(ret);
138 }
139
140 int
main(int argc,char * argv[])141 main(int argc, char *argv[])
142 {
143 int ch, efd, fd, name[4];
144 char *binfile, *corefile;
145 char passpath[MAXPATHLEN];
146 struct dumpers **d, *dumper;
147 size_t len;
148
149 pflags = 0;
150 corefile = NULL;
151 while ((ch = getopt(argc, argv, "c:fk")) != -1) {
152 switch (ch) {
153 case 'c':
154 corefile = optarg;
155 break;
156 case 'f':
157 pflags |= PFLAGS_FULL;
158 break;
159 case 'k':
160 kflag = true;
161 break;
162 default:
163 usage();
164 break;
165 }
166 }
167 argv += optind;
168 argc -= optind;
169
170 /* XXX we should check that the pid argument is really a number */
171 switch (argc) {
172 case 1:
173 pid = atoi(argv[0]);
174 break;
175 case 2:
176 binfile = argv[0];
177 pid = atoi(argv[1]);
178 break;
179 default:
180 usage();
181 }
182
183 if (kflag) {
184 fd = open_corefile(corefile);
185 kcoredump(fd, pid);
186 }
187
188 if (argc == 1) {
189 name[0] = CTL_KERN;
190 name[1] = KERN_PROC;
191 name[2] = KERN_PROC_PATHNAME;
192 name[3] = pid;
193 len = sizeof(passpath);
194 if (sysctl(name, 4, passpath, &len, NULL, 0) == -1)
195 errx(1, "kern.proc.pathname failure");
196 binfile = passpath;
197 }
198 efd = open(binfile, O_RDONLY, 0);
199 if (efd < 0)
200 err(1, "%s", binfile);
201 dumper = NULL;
202 SET_FOREACH(d, dumpset) {
203 lseek(efd, 0, SEEK_SET);
204 if (((*d)->ident)(efd, pid, binfile)) {
205 dumper = (*d);
206 lseek(efd, 0, SEEK_SET);
207 break;
208 }
209 }
210 if (dumper == NULL)
211 errx(1, "Invalid executable file");
212 fd = open_corefile(corefile);
213
214 dumper->dump(efd, fd, pid);
215 (void)close(fd);
216 (void)close(efd);
217 exit(0);
218 }
219
220 void
usage(void)221 usage(void)
222 {
223
224 (void)fprintf(stderr,
225 "usage: gcore [-kf] [-c core] [executable] pid\n");
226 exit(1);
227 }
228