source: branches/3.2/mindi-busybox/archival/ar.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 7.1 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini ar implementation for busybox
4 *
5 * Copyright (C) 2000 by Glenn McGrath
6 *
7 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 *
11 * Archive creation support:
12 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
13 * Written by Alexander Shishkin.
14 *
15 * There is no single standard to adhere to so ar may not portable
16 * between different systems
17 * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
18 */
19
20//usage:#define ar_trivial_usage
21//usage:       "[-o] [-v] [-p] [-t] [-x] ARCHIVE FILES"
22//usage:#define ar_full_usage "\n\n"
23//usage:       "Extract or list FILES from an ar archive\n"
24//usage:     "\n    -o  Preserve original dates"
25//usage:     "\n    -p  Extract to stdout"
26//usage:     "\n    -t  List"
27//usage:     "\n    -x  Extract"
28//usage:     "\n    -v  Verbose"
29
30#include "libbb.h"
31#include "bb_archive.h"
32#include "ar.h"
33
34#if ENABLE_FEATURE_AR_CREATE
35/* filter out entries with same names as specified on the command line */
36static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
37{
38    if (find_list_entry(handle->accept, handle->file_header->name))
39        return EXIT_FAILURE;
40
41    return EXIT_SUCCESS;
42}
43
44static void output_ar_header(archive_handle_t *handle)
45{
46    /* GNU ar 2.19.51.0.14 creates malformed archives
47     * if input files are >10G. It also truncates files >4GB
48     * (uses "size mod 4G"). We abort in this case:
49     * We could add support for up to 10G files, but this is unlikely to be useful.
50     * Note that unpacking side limits all fields to "unsigned int" data type,
51     * and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
52     */
53    enum {
54        /* for 2nd field: mtime */
55        MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
56        /* for last field: filesize */
57        MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
58    };
59
60    struct file_header_t *fh = handle->file_header;
61
62    if (handle->offset & 1) {
63        xwrite(handle->src_fd, "\n", 1);
64        handle->offset++;
65    }
66
67    /* Careful! The widths should be exact. Fields must be separated */
68    if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
69        bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
70    }
71    fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
72            fh->name,
73            (sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
74            fh->uid > 99999 ? 0 : (int)fh->uid,
75            fh->gid > 99999 ? 0 : (int)fh->gid,
76            (int)fh->mode & 07777777,
77            fh->size
78    );
79
80    handle->offset += AR_HEADER_LEN;
81}
82
83/*
84 * when replacing files in an existing archive, copy from the
85 * original archive those files that are to be left intact
86 */
87static void FAST_FUNC copy_data(archive_handle_t *handle)
88{
89    archive_handle_t *out_handle = handle->ar__out;
90    struct file_header_t *fh = handle->file_header;
91
92    out_handle->file_header = fh;
93    output_ar_header(out_handle);
94
95    bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
96    out_handle->offset += fh->size;
97}
98
99static int write_ar_header(archive_handle_t *handle)
100{
101    char *fn;
102    char fn_h[17]; /* 15 + "/" + NUL */
103    struct stat st;
104    int fd;
105
106    fn = llist_pop(&handle->accept);
107    if (!fn)
108        return -1;
109
110    xstat(fn, &st);
111
112    handle->file_header->mtime = st.st_mtime;
113    handle->file_header->uid = st.st_uid;
114    handle->file_header->gid = st.st_gid;
115    handle->file_header->mode = st.st_mode;
116    handle->file_header->size = st.st_size;
117    handle->file_header->name = fn_h;
118//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
119    sprintf(fn_h, "%.15s/", bb_basename(fn));
120
121    output_ar_header(handle);
122
123    fd = xopen(fn, O_RDONLY);
124    bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
125    close(fd);
126    handle->offset += st.st_size;
127
128    return 0;
129}
130
131static int write_ar_archive(archive_handle_t *handle)
132{
133    struct stat st;
134    archive_handle_t *out_handle;
135
136    xfstat(handle->src_fd, &st, handle->ar__name);
137
138    /* if archive exists, create a new handle for output.
139     * we create it in place of the old one.
140     */
141    if (st.st_size != 0) {
142        out_handle = init_handle();
143        xunlink(handle->ar__name);
144        out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
145        out_handle->accept = handle->accept;
146    } else {
147        out_handle = handle;
148    }
149
150    handle->ar__out = out_handle;
151
152    xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
153    out_handle->offset += AR_MAGIC_LEN + 1;
154
155    /* skip to the end of the archive if we have to append stuff */
156    if (st.st_size != 0) {
157        handle->filter = filter_replaceable;
158        handle->action_data = copy_data;
159        unpack_ar_archive(handle);
160    }
161
162    while (write_ar_header(out_handle) == 0)
163        continue;
164
165    /* optional, since we exit right after we return */
166    if (ENABLE_FEATURE_CLEAN_UP) {
167        close(handle->src_fd);
168        if (out_handle->src_fd != handle->src_fd)
169            close(out_handle->src_fd);
170    }
171
172    return EXIT_SUCCESS;
173}
174#endif /* FEATURE_AR_CREATE */
175
176static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
177{
178    const char *mode = bb_mode_string(file_header->mode);
179    char *mtime;
180
181    mtime = ctime(&file_header->mtime);
182    mtime[16] = ' ';
183    memmove(&mtime[17], &mtime[20], 4);
184    mtime[21] = '\0';
185    printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
186            (int)file_header->uid, (int)file_header->gid,
187            file_header->size,
188            &mtime[4], file_header->name
189    );
190}
191
192#define AR_OPT_VERBOSE          (1 << 0)
193#define AR_OPT_PRESERVE_DATE    (1 << 1)
194/* "ar r" implies create, but warns about it. c suppresses warning.
195 * bbox accepts but ignores it: */
196#define AR_OPT_CREATE           (1 << 2)
197
198#define AR_CMD_PRINT            (1 << 3)
199#define FIRST_CMD               AR_CMD_PRINT
200#define AR_CMD_LIST             (1 << 4)
201#define AR_CMD_EXTRACT          (1 << 5)
202#define AR_CMD_INSERT           (1 << 6)
203
204int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
205int ar_main(int argc UNUSED_PARAM, char **argv)
206{
207    archive_handle_t *archive_handle;
208    unsigned opt, t;
209
210    archive_handle = init_handle();
211
212    /* --: prepend '-' to the first argument if required */
213    /* -1: at least one param is reqd */
214    /* one of p,t,x[,r] is required */
215    opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
216    opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
217    argv += optind;
218
219    t = opt / FIRST_CMD;
220    if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
221        bb_show_usage();
222
223    if (opt & AR_CMD_PRINT) {
224        archive_handle->action_data = data_extract_to_stdout;
225    }
226    if (opt & AR_CMD_LIST) {
227        archive_handle->action_header = header_list;
228    }
229    if (opt & AR_CMD_EXTRACT) {
230        archive_handle->action_data = data_extract_all;
231    }
232    if (opt & AR_OPT_PRESERVE_DATE) {
233        archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
234    }
235    if (opt & AR_OPT_VERBOSE) {
236        archive_handle->action_header = header_verbose_list_ar;
237    }
238#if ENABLE_FEATURE_AR_CREATE
239    archive_handle->ar__name = *argv;
240#endif
241    archive_handle->src_fd = xopen(*argv++,
242            (opt & AR_CMD_INSERT)
243                ? O_RDWR | O_CREAT
244                : O_RDONLY
245    );
246
247    if (*argv)
248        archive_handle->filter = filter_accept_list;
249    while (*argv) {
250        llist_add_to_end(&archive_handle->accept, *argv++);
251    }
252
253#if ENABLE_FEATURE_AR_CREATE
254    if (opt & AR_CMD_INSERT)
255        return write_ar_archive(archive_handle);
256#endif
257
258    unpack_ar_archive(archive_handle);
259
260    return EXIT_SUCCESS;
261}
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