source: MondoRescue/branches/2.2.9/mindi-busybox/archival/libarchive/get_header_cpio.c@ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 5.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* Copyright 2002 Laurence Anderson
3 *
4 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
5 */
6
7#include "libbb.h"
8#include "archive.h"
9
10typedef struct hardlinks_t {
11 struct hardlinks_t *next;
12 int inode; /* TODO: must match maj/min too! */
13 int mode ;
14 int mtime; /* These three are useful only in corner case */
15 int uid ; /* of hardlinks with zero size body */
16 int gid ;
17 char name[1];
18} hardlinks_t;
19
20char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
21{
22 file_header_t *file_header = archive_handle->file_header;
23 char cpio_header[110];
24 int namesize;
25 int major, minor, nlink, mode, inode;
26 unsigned size, uid, gid, mtime;
27
28 /* There can be padding before archive header */
29 data_align(archive_handle, 4);
30
31 size = full_read(archive_handle->src_fd, cpio_header, 110);
32 if (size == 0) {
33 goto create_hardlinks;
34 }
35 if (size != 110) {
36 bb_error_msg_and_die("short read");
37 }
38 archive_handle->offset += 110;
39
40 if (strncmp(&cpio_header[0], "07070", 5) != 0
41 || (cpio_header[5] != '1' && cpio_header[5] != '2')
42 ) {
43 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
44 }
45
46 if (sscanf(cpio_header + 6,
47 "%8x" "%8x" "%8x" "%8x"
48 "%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
49 /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
50 &inode, &mode, &uid, &gid,
51 &nlink, &mtime, &size,
52 &major, &minor, &namesize) != 10)
53 bb_error_msg_and_die("damaged cpio file");
54 file_header->mode = mode;
55 file_header->uid = uid;
56 file_header->gid = gid;
57 file_header->mtime = mtime;
58 file_header->size = size;
59
60 namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
61 file_header->name = xzalloc(namesize + 1);
62 /* Read in filename */
63 xread(archive_handle->src_fd, file_header->name, namesize);
64 if (file_header->name[0] == '/') {
65 /* Testcase: echo /etc/hosts | cpio -pvd /tmp
66 * Without this code, it tries to unpack /etc/hosts
67 * into "/etc/hosts", not "etc/hosts".
68 */
69 char *p = file_header->name;
70 do p++; while (*p == '/');
71 overlapping_strcpy(file_header->name, p);
72 }
73 archive_handle->offset += namesize;
74
75 /* Update offset amount and skip padding before file contents */
76 data_align(archive_handle, 4);
77
78 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
79 /* Always round up. ">> 9" divides by 512 */
80 archive_handle->cpio__blocks = (uoff_t)(archive_handle->offset + 511) >> 9;
81 goto create_hardlinks;
82 }
83
84 file_header->link_target = NULL;
85 if (S_ISLNK(file_header->mode)) {
86 file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
87 file_header->link_target = xzalloc(file_header->size + 1);
88 xread(archive_handle->src_fd, file_header->link_target, file_header->size);
89 archive_handle->offset += file_header->size;
90 file_header->size = 0; /* Stop possible seeks in future */
91 }
92
93// TODO: data_extract_all can't deal with hardlinks to non-files...
94// when fixed, change S_ISREG to !S_ISDIR here
95
96 if (nlink > 1 && S_ISREG(file_header->mode)) {
97 hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
98 new->inode = inode;
99 new->mode = mode ;
100 new->mtime = mtime;
101 new->uid = uid ;
102 new->gid = gid ;
103 strcpy(new->name, file_header->name);
104 /* Put file on a linked list for later */
105 if (size == 0) {
106 new->next = archive_handle->cpio__hardlinks_to_create;
107 archive_handle->cpio__hardlinks_to_create = new;
108 return EXIT_SUCCESS; /* Skip this one */
109 /* TODO: this breaks cpio -t (it does not show hardlinks) */
110 }
111 new->next = archive_handle->cpio__created_hardlinks;
112 archive_handle->cpio__created_hardlinks = new;
113 }
114 file_header->device = makedev(major, minor);
115
116 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
117 archive_handle->action_data(archive_handle);
118//TODO: run "echo /etc/hosts | cpio -pv /tmp" twice. On 2nd run:
119//cpio: etc/hosts not created: newer or same age file exists
120//etc/hosts <-- should NOT show it
121//2 blocks <-- should say "0 blocks"
122 archive_handle->action_header(file_header);
123 } else {
124 data_skip(archive_handle);
125 }
126
127 archive_handle->offset += file_header->size;
128
129 free(file_header->link_target);
130 free(file_header->name);
131 file_header->link_target = NULL;
132 file_header->name = NULL;
133
134 return EXIT_SUCCESS;
135
136 create_hardlinks:
137 free(file_header->link_target);
138 free(file_header->name);
139
140 while (archive_handle->cpio__hardlinks_to_create) {
141 hardlinks_t *cur;
142 hardlinks_t *make_me = archive_handle->cpio__hardlinks_to_create;
143
144 archive_handle->cpio__hardlinks_to_create = make_me->next;
145
146 memset(file_header, 0, sizeof(*file_header));
147 file_header->mtime = make_me->mtime;
148 file_header->name = make_me->name;
149 file_header->mode = make_me->mode;
150 file_header->uid = make_me->uid;
151 file_header->gid = make_me->gid;
152 /*file_header->size = 0;*/
153 /*file_header->link_target = NULL;*/
154
155 /* Try to find a file we are hardlinked to */
156 cur = archive_handle->cpio__created_hardlinks;
157 while (cur) {
158 /* TODO: must match maj/min too! */
159 if (cur->inode == make_me->inode) {
160 file_header->link_target = cur->name;
161 /* link_target != NULL, size = 0: "I am a hardlink" */
162 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
163 archive_handle->action_data(archive_handle);
164 free(make_me);
165 goto next_link;
166 }
167 cur = cur->next;
168 }
169 /* Oops... no file with such inode was created... do it now
170 * (happens when hardlinked files are empty (zero length)) */
171 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
172 archive_handle->action_data(archive_handle);
173 /* Move to the list of created hardlinked files */
174 make_me->next = archive_handle->cpio__created_hardlinks;
175 archive_handle->cpio__created_hardlinks = make_me;
176 next_link: ;
177 }
178
179 while (archive_handle->cpio__created_hardlinks) {
180 hardlinks_t *p = archive_handle->cpio__created_hardlinks;
181 archive_handle->cpio__created_hardlinks = p->next;
182 free(p);
183 }
184
185 return EXIT_FAILURE; /* "No more files to process" */
186}
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