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