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
|
/* extract.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <spawn.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/xattr.h>
#include "apk_context.h"
#include "apk_extract.h"
static int uvol_run(struct apk_ctx *ac, char *action, const char *volname, char *arg1, char *arg2)
{
struct apk_out *out = &ac->out;
pid_t pid;
int r, status;
char *argv[] = { (char*)apk_ctx_get_uvol(ac), action, (char*) volname, arg1, arg2, 0 };
posix_spawn_file_actions_t act;
posix_spawn_file_actions_init(&act);
posix_spawn_file_actions_addclose(&act, STDIN_FILENO);
r = posix_spawn(&pid, apk_ctx_get_uvol(ac), &act, 0, argv, environ);
posix_spawn_file_actions_destroy(&act);
if (r != 0) {
apk_err(out, "%s: uvol exec error: %s", volname, apk_error_str(r));
return r;
}
while (waitpid(pid, &status, 0) < 0 && errno == EINTR);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
apk_err(out, "%s: uvol exited with error %d", volname, WEXITSTATUS(status));
return -APKE_UVOL;
}
return 0;
}
static int uvol_extract(struct apk_ctx *ac, const char *volname, char *arg1, off_t sz,
struct apk_istream *is, apk_progress_cb cb, void *cb_ctx)
{
struct apk_out *out = &ac->out;
struct apk_ostream *os;
pid_t pid;
int r, status, pipefds[2];
char *argv[] = { (char*)apk_ctx_get_uvol(ac), "write", (char*) volname, arg1, 0 };
posix_spawn_file_actions_t act;
if (pipe2(pipefds, O_CLOEXEC) != 0) return -errno;
posix_spawn_file_actions_init(&act);
posix_spawn_file_actions_adddup2(&act, pipefds[0], STDIN_FILENO);
r = posix_spawn(&pid, apk_ctx_get_uvol(ac), &act, 0, argv, environ);
posix_spawn_file_actions_destroy(&act);
if (r != 0) {
apk_err(out, "%s: uvol exec error: %s", volname, apk_error_str(r));
return r;
}
close(pipefds[0]);
os = apk_ostream_to_fd(pipefds[1]);
apk_stream_copy(is, os, sz, cb, cb_ctx, 0);
r = apk_ostream_close(os);
if (r != 0) {
if (r >= 0) r = -APKE_UVOL;
apk_err(out, "%s: uvol write error: %s", volname, apk_error_str(r));
return r;
}
while (waitpid(pid, &status, 0) < 0 && errno == EINTR);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
apk_err(out, "%s: uvol exited with error %d", volname, WEXITSTATUS(status));
return -APKE_UVOL;
}
return 0;
}
static int apk_extract_volume(struct apk_ctx *ac, const struct apk_file_info *fi,
struct apk_istream *is, apk_progress_cb cb, void *cb_ctx)
{
char size[64];
int r;
snprintf(size, sizeof size, "%ju", fi->size);
r = uvol_run(ac, "create", fi->uvol_name, size, "ro");
if (r != 0) return r;
r = uvol_extract(ac, fi->uvol_name, size, fi->size, is, cb, cb_ctx);
if (r == 0) r = uvol_run(ac, "up", fi->uvol_name, 0, 0);
if (r != 0) uvol_run(ac, "remove", fi->uvol_name, 0, 0);
return r;
}
int apk_extract_file(int atfd, const struct apk_file_info *ae,
const char *extract_name, const char *link_target,
struct apk_istream *is,
apk_progress_cb cb, void *cb_ctx,
unsigned int extract_flags, struct apk_ctx *ac)
{
struct apk_out *out = &ac->out;
struct apk_xattr *xattr;
const char *fn = extract_name ?: ae->name;
int fd, r = -1, atflags = 0, ret = 0;
if (ae->uvol_name && is) {
if (extract_name || link_target) return -APKE_UVOL;
return apk_extract_volume(ac, ae, is, cb, cb_ctx);
}
if (!S_ISDIR(ae->mode) && !(extract_flags & APK_EXTRACTF_NO_OVERWRITE)) {
if (unlinkat(atfd, fn, 0) != 0 && errno != ENOENT) return -errno;
}
switch (ae->mode & S_IFMT) {
case S_IFDIR:
r = mkdirat(atfd, fn, ae->mode & 07777);
if (r < 0 && errno != EEXIST)
ret = -errno;
break;
case S_IFREG:
if (ae->link_target == NULL) {
int flags = O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC | O_EXCL;
int fd = openat(atfd, fn, flags, ae->mode & 07777);
if (fd < 0) {
ret = -errno;
break;
}
struct apk_ostream *os = apk_ostream_to_fd(fd);
if (IS_ERR(os)) {
ret = PTR_ERR(os);
break;
}
apk_stream_copy(is, os, ae->size, cb, cb_ctx, 0);
r = apk_ostream_close(os);
if (r < 0) {
unlinkat(atfd, fn, 0);
ret = r;
}
} else {
r = linkat(atfd, link_target ?: ae->link_target, atfd, fn, 0);
if (r < 0) ret = -errno;
}
break;
case S_IFLNK:
r = symlinkat(link_target ?: ae->link_target, atfd, fn);
if (r < 0) ret = -errno;
atflags |= AT_SYMLINK_NOFOLLOW;
break;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
r = mknodat(atfd, fn, ae->mode, ae->device);
if (r < 0) ret = -errno;
break;
}
if (ret) {
apk_err(out, "Failed to create %s: %s", ae->name, strerror(-ret));
return ret;
}
if (!(extract_flags & APK_EXTRACTF_NO_CHOWN)) {
r = fchownat(atfd, fn, ae->uid, ae->gid, atflags);
if (r < 0) {
apk_err(out, "Failed to set ownership on %s: %s",
fn, strerror(errno));
if (!ret) ret = -errno;
}
/* chown resets suid bit so we need set it again */
if (ae->mode & 07000) {
r = fchmodat(atfd, fn, ae->mode & 07777, atflags);
if (r < 0) {
apk_err(out, "Failed to set file permissions on %s: %s",
fn, strerror(errno));
if (!ret) ret = -errno;
}
}
}
/* extract xattrs */
if (!S_ISLNK(ae->mode) && ae->xattrs && ae->xattrs->num) {
r = 0;
fd = openat(atfd, fn, O_RDWR);
if (fd >= 0) {
foreach_array_item(xattr, ae->xattrs) {
if (fsetxattr(fd, xattr->name, xattr->value.ptr, xattr->value.len, 0) < 0) {
r = -errno;
if (r != -ENOTSUP) break;
}
}
close(fd);
} else {
r = -errno;
}
if (r) {
if (r != -ENOTSUP)
apk_err(out, "Failed to set xattrs on %s: %s",
fn, strerror(-r));
if (!ret) ret = r;
}
}
if (!S_ISLNK(ae->mode)) {
/* preserve modification time */
struct timespec times[2];
times[0].tv_sec = times[1].tv_sec = ae->mtime;
times[0].tv_nsec = times[1].tv_nsec = 0;
r = utimensat(atfd, fn, times, atflags);
if (r < 0) {
apk_err(out, "Failed to preserve modification time on %s: %s",
fn, strerror(errno));
if (!ret || ret == -ENOTSUP) ret = -errno;
}
}
return ret;
}
int apk_extract(struct apk_extract_ctx *ectx, struct apk_istream *is)
{
void *sig;
if (IS_ERR(is)) return PTR_ERR(is);
sig = apk_istream_peek(is, 4);
if (IS_ERR(sig)) return apk_istream_close_error(is, PTR_ERR(sig));
if (memcmp(sig, "ADB", 3) == 0) return apk_extract_v3(ectx, is);
return apk_extract_v2(ectx, is);
}
|
