1 /* vi: set sw=4 ts=4: */
3 * Mini ar implementation for busybox
5 * Copyright (C) 2000 by Glenn McGrath
7 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 * Archive creation support:
12 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
13 * Written by Alexander Shishkin.
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
20 //applet:IF_AR(APPLET(ar, BB_DIR_USR_BIN, BB_SUID_DROP))
21 //kbuild:lib-$(CONFIG_AR) += ar.o
23 //usage:#define ar_trivial_usage
24 //usage: "[-o] [-v] [-p] [-t] [-x] ARCHIVE FILES"
25 //usage:#define ar_full_usage "\n\n"
26 //usage: "Extract or list FILES from an ar archive\n"
27 //usage: "\n -o Preserve original dates"
28 //usage: "\n -p Extract to stdout"
30 //usage: "\n -x Extract"
31 //usage: "\n -v Verbose"
34 #include "bb_archive.h"
37 #if ENABLE_FEATURE_AR_CREATE
38 /* filter out entries with same names as specified on the command line */
39 static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
41 if (find_list_entry(handle->accept, handle->file_header->name))
47 static void output_ar_header(archive_handle_t *handle)
49 /* GNU ar 2.19.51.0.14 creates malformed archives
50 * if input files are >10G. It also truncates files >4GB
51 * (uses "size mod 4G"). We abort in this case:
52 * We could add support for up to 10G files, but this is unlikely to be useful.
53 * Note that unpacking side limits all fields to "unsigned int" data type,
54 * and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
57 /* for 2nd field: mtime */
58 MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
59 /* for last field: filesize */
60 MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
63 struct file_header_t *fh = handle->file_header;
65 if (handle->offset & 1) {
66 xwrite(handle->src_fd, "\n", 1);
70 /* Careful! The widths should be exact. Fields must be separated */
71 if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
72 bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
74 fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
76 (sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
77 fh->uid > 99999 ? 0 : (int)fh->uid,
78 fh->gid > 99999 ? 0 : (int)fh->gid,
79 (int)fh->mode & 07777777,
83 handle->offset += AR_HEADER_LEN;
87 * when replacing files in an existing archive, copy from the
88 * original archive those files that are to be left intact
90 static void FAST_FUNC copy_data(archive_handle_t *handle)
92 archive_handle_t *out_handle = handle->ar__out;
93 struct file_header_t *fh = handle->file_header;
95 out_handle->file_header = fh;
96 output_ar_header(out_handle);
98 bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
99 out_handle->offset += fh->size;
102 static int write_ar_header(archive_handle_t *handle)
105 char fn_h[17]; /* 15 + "/" + NUL */
109 fn = llist_pop(&handle->accept);
115 handle->file_header->mtime = st.st_mtime;
116 handle->file_header->uid = st.st_uid;
117 handle->file_header->gid = st.st_gid;
118 handle->file_header->mode = st.st_mode;
119 handle->file_header->size = st.st_size;
120 handle->file_header->name = fn_h;
121 //TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
122 sprintf(fn_h, "%.15s/", bb_basename(fn));
124 output_ar_header(handle);
126 fd = xopen(fn, O_RDONLY);
127 bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
129 handle->offset += st.st_size;
134 static int write_ar_archive(archive_handle_t *handle)
137 archive_handle_t *out_handle;
139 xfstat(handle->src_fd, &st, handle->ar__name);
141 /* if archive exists, create a new handle for output.
142 * we create it in place of the old one.
144 if (st.st_size != 0) {
145 out_handle = init_handle();
146 xunlink(handle->ar__name);
147 out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
148 out_handle->accept = handle->accept;
153 handle->ar__out = out_handle;
155 xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
156 out_handle->offset += AR_MAGIC_LEN + 1;
158 /* skip to the end of the archive if we have to append stuff */
159 if (st.st_size != 0) {
160 handle->filter = filter_replaceable;
161 handle->action_data = copy_data;
162 unpack_ar_archive(handle);
165 while (write_ar_header(out_handle) == 0)
168 /* optional, since we exit right after we return */
169 if (ENABLE_FEATURE_CLEAN_UP) {
170 close(handle->src_fd);
171 if (out_handle->src_fd != handle->src_fd)
172 close(out_handle->src_fd);
177 #endif /* FEATURE_AR_CREATE */
179 static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
181 const char *mode = bb_mode_string(file_header->mode);
184 mtime = ctime(&file_header->mtime);
186 memmove(&mtime[17], &mtime[20], 4);
188 printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
189 (int)file_header->uid, (int)file_header->gid,
191 &mtime[4], file_header->name
195 #define AR_OPT_VERBOSE (1 << 0)
196 #define AR_OPT_PRESERVE_DATE (1 << 1)
197 /* "ar r" implies create, but warns about it. c suppresses warning.
198 * bbox accepts but ignores it: */
199 #define AR_OPT_CREATE (1 << 2)
201 #define AR_CMD_PRINT (1 << 3)
202 #define FIRST_CMD AR_CMD_PRINT
203 #define AR_CMD_LIST (1 << 4)
204 #define AR_CMD_EXTRACT (1 << 5)
205 #define AR_CMD_INSERT (1 << 6)
207 int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
208 int ar_main(int argc UNUSED_PARAM, char **argv)
210 archive_handle_t *archive_handle;
213 archive_handle = init_handle();
215 /* --: prepend '-' to the first argument if required */
216 /* -1: at least one param is reqd */
217 /* one of p,t,x[,r] is required */
218 opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
219 opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
223 if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
226 if (opt & AR_CMD_PRINT) {
227 archive_handle->action_data = data_extract_to_stdout;
229 if (opt & AR_CMD_LIST) {
230 archive_handle->action_header = header_list;
232 if (opt & AR_CMD_EXTRACT) {
233 archive_handle->action_data = data_extract_all;
235 if (opt & AR_OPT_PRESERVE_DATE) {
236 archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
238 if (opt & AR_OPT_VERBOSE) {
239 archive_handle->action_header = header_verbose_list_ar;
241 #if ENABLE_FEATURE_AR_CREATE
242 archive_handle->ar__name = *argv;
244 archive_handle->src_fd = xopen(*argv++,
245 (opt & AR_CMD_INSERT)
251 archive_handle->filter = filter_accept_list;
253 llist_add_to_end(&archive_handle->accept, *argv++);
256 #if ENABLE_FEATURE_AR_CREATE
257 if (opt & AR_CMD_INSERT)
258 return write_ar_archive(archive_handle);
261 unpack_ar_archive(archive_handle);