252 lines
6.7 KiB
C
252 lines
6.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ar implementation for busybox
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*
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* Copyright (C) 2000 by Glenn McGrath
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*
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* Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
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* Archive creation support:
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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* Written by Alexander Shishkin.
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*
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* There is no single standard to adhere to so ar may not portable
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* between different systems
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* http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
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*/
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#include "libbb.h"
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#include "archive.h"
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#include "ar.h"
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#if ENABLE_FEATURE_AR_CREATE
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/* filter out entries with same names as specified on the command line */
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static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
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{
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if (find_list_entry(handle->accept, handle->file_header->name))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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static void output_ar_header(archive_handle_t *handle)
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{
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/* GNU ar 2.19.51.0.14 creates malformed archives
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* if input files are >10G. It also truncates files >4GB
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* (uses "size mod 4G"). We abort in this case:
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* We could add support for up to 10G files, but this is unlikely to be useful.
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* Note that unpacking side limits all fields to "unsigned int" data type,
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* and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
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*/
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enum {
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/* for 2nd field: mtime */
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MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
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/* for last field: filesize */
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MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
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};
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struct file_header_t *fh = handle->file_header;
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if (handle->offset & 1) {
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xwrite(handle->src_fd, "\n", 1);
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handle->offset++;
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}
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/* Careful! The widths should be exact. Fields must be separated */
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if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
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bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
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}
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fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
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fh->name,
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(sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
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fh->uid > 99999 ? 0 : (int)fh->uid,
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fh->gid > 99999 ? 0 : (int)fh->gid,
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(int)fh->mode & 07777777,
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fh->size
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);
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handle->offset += AR_HEADER_LEN;
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}
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/*
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* when replacing files in an existing archive, copy from the the
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* original archive those files that are to be left intact
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*/
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static void FAST_FUNC copy_data(archive_handle_t *handle)
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{
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archive_handle_t *out_handle = handle->ar__out;
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struct file_header_t *fh = handle->file_header;
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out_handle->file_header = fh;
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output_ar_header(out_handle);
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bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
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out_handle->offset += fh->size;
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}
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static int write_ar_header(archive_handle_t *handle)
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{
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char *fn;
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char fn_h[17]; /* 15 + "/" + NUL */
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struct stat st;
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int fd;
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fn = llist_pop(&handle->accept);
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if (!fn)
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return -1;
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xstat(fn, &st);
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handle->file_header->mtime = st.st_mtime;
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handle->file_header->uid = st.st_uid;
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handle->file_header->gid = st.st_gid;
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handle->file_header->mode = st.st_mode;
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handle->file_header->size = st.st_size;
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handle->file_header->name = fn_h;
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//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
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sprintf(fn_h, "%.15s/", bb_basename(fn));
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output_ar_header(handle);
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fd = xopen(fn, O_RDONLY);
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bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
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close(fd);
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handle->offset += st.st_size;
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return 0;
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}
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static int write_ar_archive(archive_handle_t *handle)
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{
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struct stat st;
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archive_handle_t *out_handle;
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xfstat(handle->src_fd, &st, handle->ar__name);
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/* if archive exists, create a new handle for output.
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* we create it in place of the old one.
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*/
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if (st.st_size != 0) {
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out_handle = init_handle();
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xunlink(handle->ar__name);
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out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
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out_handle->accept = handle->accept;
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} else {
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out_handle = handle;
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}
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handle->ar__out = out_handle;
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xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
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out_handle->offset += AR_MAGIC_LEN + 1;
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/* skip to the end of the archive if we have to append stuff */
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if (st.st_size != 0) {
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handle->filter = filter_replaceable;
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handle->action_data = copy_data;
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unpack_ar_archive(handle);
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}
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while (write_ar_header(out_handle) == 0)
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continue;
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/* optional, since we exit right after we return */
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(handle->src_fd);
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if (out_handle->src_fd != handle->src_fd)
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close(out_handle->src_fd);
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}
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return EXIT_SUCCESS;
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}
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#endif /* FEATURE_AR_CREATE */
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static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
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{
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const char *mode = bb_mode_string(file_header->mode);
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char *mtime;
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mtime = ctime(&file_header->mtime);
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mtime[16] = ' ';
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memmove(&mtime[17], &mtime[20], 4);
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mtime[21] = '\0';
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printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
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(int)file_header->uid, (int)file_header->gid,
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file_header->size,
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&mtime[4], file_header->name
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);
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}
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#define AR_OPT_VERBOSE (1 << 0)
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#define AR_OPT_PRESERVE_DATE (1 << 1)
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/* "ar r" implies create, but warns about it. c suppresses warning.
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* bbox accepts but ignores it: */
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#define AR_OPT_CREATE (1 << 2)
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#define AR_CMD_PRINT (1 << 3)
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#define FIRST_CMD AR_CMD_PRINT
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#define AR_CMD_LIST (1 << 4)
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#define AR_CMD_EXTRACT (1 << 5)
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#define AR_CMD_INSERT (1 << 6)
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int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ar_main(int argc UNUSED_PARAM, char **argv)
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{
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archive_handle_t *archive_handle;
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unsigned opt, t;
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archive_handle = init_handle();
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/* --: prepend '-' to the first argument if required */
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/* -1: at least one param is reqd */
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/* one of p,t,x[,r] is required */
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opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
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opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
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argv += optind;
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t = opt / FIRST_CMD;
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if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
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bb_show_usage();
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if (opt & AR_CMD_PRINT) {
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archive_handle->action_data = data_extract_to_stdout;
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}
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if (opt & AR_CMD_LIST) {
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archive_handle->action_header = header_list;
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}
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if (opt & AR_CMD_EXTRACT) {
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archive_handle->action_data = data_extract_all;
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}
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if (opt & AR_OPT_PRESERVE_DATE) {
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archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
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}
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if (opt & AR_OPT_VERBOSE) {
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archive_handle->action_header = header_verbose_list_ar;
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}
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#if ENABLE_FEATURE_AR_CREATE
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archive_handle->ar__name = *argv;
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#endif
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archive_handle->src_fd = xopen(*argv++,
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(opt & AR_CMD_INSERT)
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? O_RDWR | O_CREAT
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: O_RDONLY
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);
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if (*argv)
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archive_handle->filter = filter_accept_list;
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while (*argv) {
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llist_add_to_end(&archive_handle->accept, *argv++);
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}
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#if ENABLE_FEATURE_AR_CREATE
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if (opt & AR_CMD_INSERT)
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return write_ar_archive(archive_handle);
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#endif
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unpack_ar_archive(archive_handle);
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return EXIT_SUCCESS;
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}
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