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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <errno.h>
#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/wait.h>
#include <signal.h>
#include "unarchive.h"
#include "busybox.h"
/* Extract the data postioned at src_stream to either filesystem, stdout or
* buffer depending on the value of 'function' which is defined in libbb.h
*
* prefix doesnt have to be just a directory, it may prefix the filename as well.
*
* e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
* '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
* 'dpkg.' as their prefix
*
* For this reason if prefix does point to a dir then it must end with a
* trailing '/' or else the last dir will be assumed to be the file prefix
*/
char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
const int function, const char *prefix)
{
FILE *dst_stream = NULL;
char *full_name = NULL;
char *buffer = NULL;
struct utimbuf t;
/* prefix doesnt have to be a proper path it may prepend
* the filename as well */
if (prefix != NULL) {
/* strip leading '/' in filename to extract as prefix may not be dir */
/* Cant use concat_path_file here as prefix might not be a directory */
char *path = file_entry->name;
if (strncmp("./", path, 2) == 0) {
path += 2;
if (strlen(path) == 0) {
return(NULL);
}
}
full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
strcpy(full_name, prefix);
strcat(full_name, path);
} else {
full_name = file_entry->name;
}
if (function & extract_to_stdout) {
if (S_ISREG(file_entry->mode)) {
copy_file_chunk(src_stream, out_stream, file_entry->size);
archive_offset += file_entry->size;
}
}
else if (function & extract_one_to_buffer) {
if (S_ISREG(file_entry->mode)) {
buffer = (char *) xmalloc(file_entry->size + 1);
fread(buffer, 1, file_entry->size, src_stream);
buffer[file_entry->size] = '\0';
archive_offset += file_entry->size;
return(buffer);
}
}
else if (function & extract_all_to_fs) {
struct stat oldfile;
int stat_res;
stat_res = lstat (full_name, &oldfile);
if (stat_res == 0) { /* The file already exists */
if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
if (!S_ISDIR(oldfile.st_mode)) {
unlink(full_name); /* Directories might not be empty etc */
}
} else {
if ((function & extract_quiet) != extract_quiet) {
error_msg("%s not created: newer or same age file exists", file_entry->name);
}
seek_sub_file(src_stream, file_entry->size);
return (NULL);
}
}
if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
char *buf, *parent;
buf = xstrdup(full_name);
parent = dirname(buf);
if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
if ((function & extract_quiet) != extract_quiet) {
error_msg("couldn't create leading directories");
}
}
free (buf);
}
switch(file_entry->mode & S_IFMT) {
case S_IFREG:
if (file_entry->link_name) { /* Found a cpio hard link */
if (link(file_entry->link_name, full_name) != 0) {
if ((function & extract_quiet) != extract_quiet) {
perror_msg("Cannot link from %s to '%s'",
file_entry->name, file_entry->link_name);
}
}
} else {
if ((dst_stream = wfopen(full_name, "w")) == NULL) {
seek_sub_file(src_stream, file_entry->size);
return NULL;
}
archive_offset += file_entry->size;
if (file_entry->extract_func) file_entry->extract_func(src_stream, dst_stream);
else copy_file_chunk(src_stream, dst_stream, file_entry->size);
fclose(dst_stream);
}
break;
case S_IFDIR:
if (stat_res != 0) {
if (mkdir(full_name, file_entry->mode) < 0) {
if ((function & extract_quiet) != extract_quiet) {
perror_msg("extract_archive: %s", full_name);
}
}
}
break;
case S_IFLNK:
if (symlink(file_entry->link_name, full_name) < 0) {
if ((function & extract_quiet) != extract_quiet) {
perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
}
return NULL;
}
break;
case S_IFSOCK:
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
if ((function & extract_quiet) != extract_quiet) {
perror_msg("Cannot create node %s", file_entry->name);
}
return NULL;
}
break;
}
/* Changing a symlink's properties normally changes the properties of the
* file pointed to, so dont try and change the date or mode, lchown does
* does the right thing, but isnt available in older versions of libc */
if (S_ISLNK(file_entry->mode)) {
#if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
lchown(full_name, file_entry->uid, file_entry->gid);
#endif
} else {
if (function & extract_preserve_date) {
t.actime = file_entry->mtime;
t.modtime = file_entry->mtime;
utime(full_name, &t);
}
chmod(full_name, file_entry->mode);
chown(full_name, file_entry->uid, file_entry->gid);
}
} else {
/* If we arent extracting data we have to skip it,
* if data size is 0 then then just do it anyway
* (saves testing for it) */
seek_sub_file(src_stream, file_entry->size);
}
/* extract_list and extract_verbose_list can be used in conjunction
* with one of the above four extraction functions, so do this seperately */
if (function & extract_verbose_list) {
fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
file_entry->uid, file_entry->gid,
(int) file_entry->size, time_string(file_entry->mtime));
}
if ((function & extract_list) || (function & extract_verbose_list)){
/* fputs doesnt add a trailing \n, so use fprintf */
fprintf(out_stream, "%s\n", full_name);
}
if (prefix != NULL) {
free(full_name);
}
return(NULL); /* Maybe we should say if failed */
}
char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
const int extract_function, const char *prefix, char **include_name, char **exclude_name)
{
file_header_t *file_entry;
int extract_flag = TRUE;
int i;
char *buffer = NULL;
#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
int pid, tape_pipe[2];
if (pipe(tape_pipe) != 0) error_msg_and_die("Can't create pipe\n");
if ((pid = fork()) == -1) error_msg_and_die("Fork failed\n");
if (pid==0) { /* child process */
close(tape_pipe[0]); /* We don't wan't to read from the pipe */
copyfd(fileno(src_stream), tape_pipe[1]);
close(tape_pipe[1]); /* Send EOF */
exit(0);
/* notreached */
}
close(tape_pipe[1]); /* Don't want to write down the pipe */
fclose(src_stream);
src_stream = fdopen(tape_pipe[0], "r");
#endif
archive_offset = 0;
while ((file_entry = get_headers(src_stream)) != NULL) {
if (include_name != NULL) {
extract_flag = FALSE;
for(i = 0; include_name[i] != 0; i++) {
if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
extract_flag = TRUE;
break;
}
}
} else {
extract_flag = TRUE;
}
/* If the file entry is in the exclude list dont extract it */
if (exclude_name != NULL) {
for(i = 0; exclude_name[i] != 0; i++) {
if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
extract_flag = FALSE;
break;
}
}
}
if (extract_flag) {
buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
} else {
/* seek past the data entry */
seek_sub_file(src_stream, file_entry->size);
}
free(file_entry->name);
free(file_entry->link_name);
free(file_entry);
}
#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
#endif
return(buffer);
}
|
