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
|
/* cpio.c - a basic cpio
*
* Written 2013 AD by Isaac Dunham; this code is placed under the
* same license as toybox or as CC0, at your option.
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cpio.html
*
* http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
USE_CPIO(NEWTOY(cpio, "H:iotuF:", TOYFLAG_BIN))
config CPIO
bool "cpio"
default n
help
usage: cpio { -iu | -o | -t } [-H FMT] [-F ARCHIVE]
copy files into and out of an archive
-i extract from archive into file system (stdin is an archive)
-o create archive (stdin is a list of files, stdout is an archive)
-t list files (stdin is an archive, stdout is a list of files)
-u always overwrite files (current default)
-H FMT write archive in specified format:
newc SVR4 new character format (default)
-F ARCHIVE read from or write to ARCHIVE
*/
#define FOR_cpio
#include "toys.h"
GLOBALS(
char *archive;
char *fmt;
)
/* Iterate through a list of files, read from stdin.
* No users need rw.
*/
void loopfiles_stdin(void (*function)(int fd, char *name, struct stat st))
{
int fd;
struct stat st;
char *name = toybuf;
while (name) {
memset(toybuf, 0, sizeof(toybuf));
name = fgets(toybuf, sizeof(toybuf) - 1, stdin);
if (name) {
if (toybuf[strlen(name) - 1] == '\n' ) {
toybuf[strlen(name) - 1 ] = '\0';
if (lstat(name, &st) == -1) continue;
fd = open(name, O_RDONLY);
if (fd > 0 || !S_ISREG(st.st_mode)) {
function(fd, name, st);
close(fd);
}
errno = 0;
}
}
}
}
struct newc_header {
char c_magic[6];
char c_ino[8];
char c_mode[8];
char c_uid[8];
char c_gid[8];
char c_nlink[8];
char c_mtime[8];
char c_filesize[8];
char c_devmajor[8];
char c_devminor[8];
char c_rdevmajor[8];
char c_rdevminor[8];
char c_namesize[8];
char c_check[8];
};
void write_cpio_member(int fd, char *name, struct stat buf)
{
char ahdr[sizeof(struct newc_header) + 1];
struct newc_header *hdr = (struct newc_header *)ahdr;
size_t out = 0;
unsigned int n = 0x00000000, nlen = strlen(name) + 1;
memset(hdr, '0', sizeof(struct newc_header));
if (S_ISDIR(buf.st_mode) || S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)
|| S_ISFIFO(buf.st_mode) || S_ISSOCK(buf.st_mode))
buf.st_size = 0;
snprintf((char *)(hdr), sizeof(struct newc_header)+1,
"070701%08X%08X" "%08X%08X"
"%08X%08X%08X"
"%08X%08X" "%08X%08X%08X00000000",
(unsigned int)(buf.st_ino), buf.st_mode, buf.st_uid, buf.st_gid,
buf.st_nlink, (uint32_t)(buf.st_mtime), (uint32_t)(buf.st_size),
major(buf.st_dev), minor(buf.st_dev),
major(buf.st_rdev), minor(buf.st_rdev), nlen);
write(1, hdr, sizeof(struct newc_header));
write(1, name, nlen);
if ((nlen + 2) & 3) write(1, &n, 4 - ((nlen + 2) & 3));
if (S_ISLNK(buf.st_mode)) {
ssize_t llen = readlink(name, toybuf, sizeof(toybuf) - 1);
if (llen > 0) {
toybuf[llen] = '\0';
write(1, toybuf, buf.st_size);
}
} else if (buf.st_size) {
for (; (lseek(fd, 0, SEEK_CUR) < (uint32_t)(buf.st_size));) {
out = read(fd, toybuf, sizeof(toybuf));
if (out > 0) write(1, toybuf, out);
if (errno || out < sizeof(toybuf)) break;
}
}
if (buf.st_size & 3) write(1, &n, 4 - (buf.st_size & 3));
}
//convert hex to uint; mostly to allow using bits of non-terminated strings
unsigned int htou(char * hex)
{
unsigned int ret = 0, i = 0;
for (;(i < 8 && hex[i]);) {
ret *= 16;
switch(hex[i]) {
case '0':
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
ret += hex[i] - '1' + 1;
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
ret += hex[i] - 'A' + 10;
break;
}
i++;
}
return ret;
}
// Read one cpio record. Returns 0 for last record, 1 for "continue".
int read_cpio_member(int fd, int how)
{
uint32_t nsize, fsize;
mode_t mode = 0;
int pad, ofd = 0;
struct newc_header hdr;
char *name;
dev_t dev = 0;
xreadall(fd, &hdr, sizeof(struct newc_header));
nsize = htou(hdr.c_namesize);
xreadall(fd, name = xmalloc(nsize), nsize);
if (!strcmp("TRAILER!!!", name)) return 0;
fsize = htou(hdr.c_filesize);
mode += htou(hdr.c_mode);
pad = 4 - ((nsize + 2) % 4); // 2 == sizeof(struct newc_header) % 4
if (pad < 4) xreadall(fd, toybuf, pad);
pad = 4 - (fsize % 4);
if (how & 1) {
if (S_ISDIR(mode)) ofd = mkdir(name, mode);
else if (S_ISLNK(mode)) {
memset(toybuf, 0, sizeof(toybuf));
if (fsize < sizeof(toybuf)) {
pad = readall(fd, toybuf, fsize);
if (pad < fsize) error_exit("short archive");
pad = 4 - (fsize % 4);
fsize = 0;
if (symlink(toybuf, name)) {
perror_msg("could not write link %s", name);
toys.exitval |= 1;
}
} else {
perror_msg("link too long: %s", name);
toys.exitval |= 1;
}
} else if (S_ISBLK(mode)||S_ISCHR(mode)||S_ISFIFO(mode)||S_ISSOCK(mode)) {
dev = makedev(htou(hdr.c_rdevmajor),htou(hdr.c_rdevminor));
ofd = mknod(name, mode, dev);
} else ofd = creat(name, mode);
if (ofd == -1) {
error_msg("could not create %s", name);
toys.exitval |= 1;
}
}
errno = 0;
if (how & 2) puts(name);
while (fsize) {
int i;
memset(toybuf, 0, sizeof(toybuf));
i = readall(fd, toybuf, (fsize>sizeof(toybuf)) ? sizeof(toybuf) : fsize);
if (i < 1) error_exit("archive too short");
if (ofd > 0) writeall(ofd, toybuf, i);
fsize -= i;
}
if (pad < 4) xreadall(fd, toybuf, pad);
return 1;
}
void read_cpio_archive(int fd, int how)
{
for(;;) if (!read_cpio_member(fd, how)) return;
}
void cpio_main(void)
{
if (TT.archive) {
if (toys.optflags & (FLAG_i|FLAG_t)) {
xclose(0);
xopen(TT.archive, O_RDONLY);
} else if (toys.optflags & FLAG_o) {
xclose(1);
xcreate(TT.archive, O_CREAT|O_WRONLY|O_TRUNC, 0755);
}
}
if (toys.optflags & FLAG_t) read_cpio_archive(0, 2);
else if (toys.optflags & FLAG_i) read_cpio_archive(0, 1);
else if (toys.optflags & FLAG_o) {
loopfiles_stdin(write_cpio_member);
write(1, "07070100000000000000000000000000000000000000010000000000000000"
"000000000000000000000000000000000000000B00000000TRAILER!!!\0\0\0", 124);
} else error_exit("must use one of -iot");
}
|
