1 /*-
2 * Copyright (c) 2007 Joerg Sonnenberger
3 * Copyright (c) 2012 Michihiro NAKAJIMA
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "archive_platform.h"
28
29 /* This capability is only available on POSIX systems. */
30 #if defined(HAVE_PIPE) && defined(HAVE_FCNTL) && \
31 (defined(HAVE_FORK) || defined(HAVE_VFORK) || defined(HAVE_POSIX_SPAWNP))
32
33 __FBSDID("$FreeBSD: head/lib/libarchive/filter_fork.c 182958 2008-09-12 05:33:00Z kientzle $");
34
35 #if defined(HAVE_SYS_TYPES_H)
36 # include <sys/types.h>
37 #endif
38 #ifdef HAVE_ERRNO_H
39 # include <errno.h>
40 #endif
41 #ifdef HAVE_STRING_H
42 # include <string.h>
43 #endif
44 #if defined(HAVE_POLL) && (defined(HAVE_POLL_H) || defined(HAVE_SYS_POLL_H))
45 # if defined(HAVE_POLL_H)
46 # include <poll.h>
47 # elif defined(HAVE_SYS_POLL_H)
48 # include <sys/poll.h>
49 # endif
50 #elif defined(HAVE_SELECT)
51 # if defined(HAVE_SYS_SELECT_H)
52 # include <sys/select.h>
53 # elif defined(HAVE_UNISTD_H)
54 # include <unistd.h>
55 # endif
56 #endif
57 #ifdef HAVE_FCNTL_H
58 # include <fcntl.h>
59 #endif
60 #ifdef HAVE_SPAWN_H
61 # include <spawn.h>
62 #endif
63 #ifdef HAVE_STDLIB_H
64 # include <stdlib.h>
65 #endif
66 #ifdef HAVE_UNISTD_H
67 # include <unistd.h>
68 #endif
69
70 #include "archive.h"
71 #include "archive_cmdline_private.h"
72
73 #include "filter_fork.h"
74
75 pid_t
__archive_create_child(const char * cmd,int * child_stdin,int * child_stdout)76 __archive_create_child(const char *cmd, int *child_stdin, int *child_stdout)
77 {
78 pid_t child;
79 int stdin_pipe[2], stdout_pipe[2], tmp;
80 #if HAVE_POSIX_SPAWNP
81 posix_spawn_file_actions_t actions;
82 int r;
83 #endif
84 struct archive_cmdline *cmdline;
85
86 cmdline = __archive_cmdline_allocate();
87 if (cmdline == NULL)
88 goto state_allocated;
89 if (__archive_cmdline_parse(cmdline, cmd) != ARCHIVE_OK)
90 goto state_allocated;
91
92 if (pipe(stdin_pipe) == -1)
93 goto state_allocated;
94 if (stdin_pipe[0] == 1 /* stdout */) {
95 if ((tmp = dup(stdin_pipe[0])) == -1)
96 goto stdin_opened;
97 close(stdin_pipe[0]);
98 stdin_pipe[0] = tmp;
99 }
100 if (pipe(stdout_pipe) == -1)
101 goto stdin_opened;
102 if (stdout_pipe[1] == 0 /* stdin */) {
103 if ((tmp = dup(stdout_pipe[1])) == -1)
104 goto stdout_opened;
105 close(stdout_pipe[1]);
106 stdout_pipe[1] = tmp;
107 }
108
109 #if HAVE_POSIX_SPAWNP
110
111 r = posix_spawn_file_actions_init(&actions);
112 if (r != 0) {
113 errno = r;
114 goto stdout_opened;
115 }
116 r = posix_spawn_file_actions_addclose(&actions, stdin_pipe[1]);
117 if (r != 0)
118 goto actions_inited;
119 r = posix_spawn_file_actions_addclose(&actions, stdout_pipe[0]);
120 if (r != 0)
121 goto actions_inited;
122 /* Setup for stdin. */
123 r = posix_spawn_file_actions_adddup2(&actions, stdin_pipe[0], 0);
124 if (r != 0)
125 goto actions_inited;
126 if (stdin_pipe[0] != 0 /* stdin */) {
127 r = posix_spawn_file_actions_addclose(&actions, stdin_pipe[0]);
128 if (r != 0)
129 goto actions_inited;
130 }
131 /* Setup for stdout. */
132 r = posix_spawn_file_actions_adddup2(&actions, stdout_pipe[1], 1);
133 if (r != 0)
134 goto actions_inited;
135 if (stdout_pipe[1] != 1 /* stdout */) {
136 r = posix_spawn_file_actions_addclose(&actions, stdout_pipe[1]);
137 if (r != 0)
138 goto actions_inited;
139 }
140 r = posix_spawnp(&child, cmdline->path, &actions, NULL,
141 cmdline->argv, NULL);
142 if (r != 0)
143 goto actions_inited;
144 posix_spawn_file_actions_destroy(&actions);
145
146 #else /* HAVE_POSIX_SPAWNP */
147
148 #if HAVE_VFORK
149 child = vfork();
150 #else
151 child = fork();
152 #endif
153 if (child == -1)
154 goto stdout_opened;
155 if (child == 0) {
156 close(stdin_pipe[1]);
157 close(stdout_pipe[0]);
158 if (dup2(stdin_pipe[0], 0 /* stdin */) == -1)
159 _exit(254);
160 if (stdin_pipe[0] != 0 /* stdin */)
161 close(stdin_pipe[0]);
162 if (dup2(stdout_pipe[1], 1 /* stdout */) == -1)
163 _exit(254);
164 if (stdout_pipe[1] != 1 /* stdout */)
165 close(stdout_pipe[1]);
166 execvp(cmdline->path, cmdline->argv);
167 _exit(254);
168 }
169 #endif /* HAVE_POSIX_SPAWNP */
170
171 close(stdin_pipe[0]);
172 close(stdout_pipe[1]);
173
174 *child_stdin = stdin_pipe[1];
175 fcntl(*child_stdin, F_SETFL, O_NONBLOCK);
176 *child_stdout = stdout_pipe[0];
177 fcntl(*child_stdout, F_SETFL, O_NONBLOCK);
178 __archive_cmdline_free(cmdline);
179
180 return child;
181
182 #if HAVE_POSIX_SPAWNP
183 actions_inited:
184 errno = r;
185 posix_spawn_file_actions_destroy(&actions);
186 #endif
187 stdout_opened:
188 close(stdout_pipe[0]);
189 close(stdout_pipe[1]);
190 stdin_opened:
191 close(stdin_pipe[0]);
192 close(stdin_pipe[1]);
193 state_allocated:
194 __archive_cmdline_free(cmdline);
195 return -1;
196 }
197
198 void
__archive_check_child(int in,int out)199 __archive_check_child(int in, int out)
200 {
201 #if defined(HAVE_POLL) && (defined(HAVE_POLL_H) || defined(HAVE_SYS_POLL_H))
202 struct pollfd fds[2];
203 int idx;
204
205 idx = 0;
206 if (in != -1) {
207 fds[idx].fd = in;
208 fds[idx].events = POLLOUT;
209 ++idx;
210 }
211 if (out != -1) {
212 fds[idx].fd = out;
213 fds[idx].events = POLLIN;
214 ++idx;
215 }
216
217 poll(fds, idx, -1); /* -1 == INFTIM, wait forever */
218 #elif defined(HAVE_SELECT)
219 fd_set fds_in, fds_out, fds_error;
220
221 FD_ZERO(&fds_in);
222 FD_ZERO(&fds_out);
223 FD_ZERO(&fds_error);
224 if (out != -1) {
225 FD_SET(out, &fds_in);
226 FD_SET(out, &fds_error);
227 }
228 if (in != -1) {
229 FD_SET(in, &fds_out);
230 FD_SET(in, &fds_error);
231 }
232 select(in < out ? out + 1 : in + 1, &fds_in, &fds_out, &fds_error, NULL);
233 #else
234 sleep(1);
235 #endif
236 }
237
238 #endif /* defined(HAVE_PIPE) && defined(HAVE_VFORK) && defined(HAVE_FCNTL) */
239