+++ /dev/null
-/*
- * Copyright (C) 2000 by Glenn McGrath
- * Copyright (C) 2001 by Laurence Anderson
- *
- * Based on previous work by busybox developers and others.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <stdio.h>
-#include <errno.h>
-#include <fnmatch.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <utime.h>
-#include "libbb.h"
-
-extern void seek_sub_file(FILE *src_stream, const int count);
-extern char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
- const int function, const char *prefix);
-
-
-#ifdef L_archive_offset
-off_t archive_offset;
-#else
-extern off_t archive_offset;
-#endif
-
-#ifdef L_seek_sub_file
-void seek_sub_file(FILE *src_stream, const int count)
-{
- int i;
- /* Try to fseek as faster */
- archive_offset += count;
- if (fseek(src_stream, count, SEEK_CUR) != 0 && errno == ESPIPE) {
- for (i = 0; i < count; i++) {
- fgetc(src_stream);
- }
- }
- return;
-}
-#endif
-
-
-
-#ifdef L_extract_archive
-/* Extract the data postioned at src_stream to either filesystem, stdout or
- * buffer depending on the value of 'function' which is defined in libbb.h
- *
- * prefix doesnt have to be just a directory, it may prefix the filename as well.
- *
- * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
- * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
- * 'dpkg.' as their prefix
- *
- * For this reason if prefix does point to a dir then it must end with a
- * trailing '/' or else the last dir will be assumed to be the file prefix
- */
-char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
- const int function, const char *prefix)
-{
- FILE *dst_stream = NULL;
- char *full_name = NULL;
- char *buffer = NULL;
- struct utimbuf t;
-
- /* prefix doesnt have to be a proper path it may prepend
- * the filename as well */
- if (prefix != NULL) {
- /* strip leading '/' in filename to extract as prefix may not be dir */
- /* Cant use concat_path_file here as prefix might not be a directory */
- char *path = file_entry->name;
- if (strncmp("./", path, 2) == 0) {
- path += 2;
- if (strlen(path) == 0) {
- return(NULL);
- }
- }
- full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
- strcpy(full_name, prefix);
- strcat(full_name, path);
- } else {
- full_name = file_entry->name;
- }
- if (function & extract_to_stdout) {
- if (S_ISREG(file_entry->mode)) {
- copy_file_chunk(src_stream, out_stream, file_entry->size);
- archive_offset += file_entry->size;
- }
- }
- else if (function & extract_one_to_buffer) {
- if (S_ISREG(file_entry->mode)) {
- buffer = (char *) xmalloc(file_entry->size + 1);
- fread(buffer, 1, file_entry->size, src_stream);
- buffer[file_entry->size] = '\0';
- archive_offset += file_entry->size;
- return(buffer);
- }
- }
- else if (function & extract_all_to_fs) {
- struct stat oldfile;
- int stat_res;
- stat_res = lstat (full_name, &oldfile);
- if (stat_res == 0) { /* The file already exists */
- if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
- if (!S_ISDIR(oldfile.st_mode)) {
- unlink(full_name); /* Directories might not be empty etc */
- }
- } else {
- if ((function & extract_quiet) != extract_quiet) {
- error_msg("%s not created: newer or same age file exists", file_entry->name);
- }
- seek_sub_file(src_stream, file_entry->size);
- return (NULL);
- }
- }
- if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
- char *buf, *parent;
- buf = xstrdup(full_name);
- parent = dirname(buf);
- if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
- if ((function & extract_quiet) != extract_quiet) {
- error_msg("couldn't create leading directories");
- }
- }
- free (buf);
- }
- switch(file_entry->mode & S_IFMT) {
- case S_IFREG:
- if (file_entry->link_name) { /* Found a cpio hard link */
- if (link(file_entry->link_name, full_name) != 0) {
- if ((function & extract_quiet) != extract_quiet) {
- perror_msg("Cannot link from %s to '%s'",
- file_entry->name, file_entry->link_name);
- }
- }
- } else {
- if ((dst_stream = wfopen(full_name, "w")) == NULL) {
- seek_sub_file(src_stream, file_entry->size);
- return NULL;
- }
- archive_offset += file_entry->size;
- copy_file_chunk(src_stream, dst_stream, file_entry->size);
- fclose(dst_stream);
- }
- break;
- case S_IFDIR:
- if (stat_res != 0) {
- if (mkdir(full_name, file_entry->mode) < 0) {
- if ((function & extract_quiet) != extract_quiet) {
- perror_msg("extract_archive: %s", full_name);
- }
- }
- }
- break;
- case S_IFLNK:
- if (symlink(file_entry->link_name, full_name) < 0) {
- if ((function & extract_quiet) != extract_quiet) {
- perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
- }
- return NULL;
- }
- break;
- case S_IFSOCK:
- case S_IFBLK:
- case S_IFCHR:
- case S_IFIFO:
- if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
- if ((function & extract_quiet) != extract_quiet) {
- perror_msg("Cannot create node %s", file_entry->name);
- }
- return NULL;
- }
- break;
- }
-
- /* Changing a symlink's properties normally changes the properties of the
- * file pointed to, so dont try and change the date or mode, lchown does
- * does the right thing, but isnt available in older versions of libc */
- if (S_ISLNK(file_entry->mode)) {
-#if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
- lchown(full_name, file_entry->uid, file_entry->gid);
-#endif
- } else {
- if (function & extract_preserve_date) {
- t.actime = file_entry->mtime;
- t.modtime = file_entry->mtime;
- utime(full_name, &t);
- }
- chmod(full_name, file_entry->mode);
- chown(full_name, file_entry->uid, file_entry->gid);
- }
- } else {
- /* If we arent extracting data we have to skip it,
- * if data size is 0 then then just do it anyway
- * (saves testing for it) */
- seek_sub_file(src_stream, file_entry->size);
- }
-
- /* extract_list and extract_verbose_list can be used in conjunction
- * with one of the above four extraction functions, so do this seperately */
- if (function & extract_verbose_list) {
- fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
- file_entry->uid, file_entry->gid,
- (int) file_entry->size, time_string(file_entry->mtime));
- }
- if ((function & extract_list) || (function & extract_verbose_list)){
- /* fputs doesnt add a trailing \n, so use fprintf */
- fprintf(out_stream, "%s\n", full_name);
- }
-
- free(full_name);
-
- return(NULL); /* Maybe we should say if failed */
-}
-#endif
-
-#ifdef L_unarchive
-char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
- const int extract_function, const char *prefix, char **include_name, char **exclude_name)
-{
- file_header_t *file_entry;
- int extract_flag = TRUE;
- int i;
- char *buffer = NULL;
-
- archive_offset = 0;
- while ((file_entry = get_headers(src_stream)) != NULL) {
-
- if (include_name != NULL) {
- extract_flag = FALSE;
- for(i = 0; include_name[i] != 0; i++) {
- if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
- extract_flag = TRUE;
- break;
- }
- }
- } else {
- extract_flag = TRUE;
- }
-
- /* If the file entry is in the exclude list dont extract it */
- if (exclude_name != NULL) {
- for(i = 0; exclude_name[i] != 0; i++) {
- if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
- extract_flag = FALSE;
- break;
- }
- }
- }
-
- if (extract_flag == TRUE) {
- buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
- } else {
- /* seek past the data entry */
- seek_sub_file(src_stream, file_entry->size);
- }
- free(file_entry->name); /* may be null, but doesn't matter */
- if (file_entry->link_name) {
- free(file_entry->link_name);
- }
- free(file_entry);
- }
- return(buffer);
-}
-#endif
-
-#ifdef L_get_header_ar
-file_header_t *get_header_ar(FILE *src_stream)
-{
- file_header_t *typed;
- union {
- char raw[60];
- struct {
- char name[16];
- char date[12];
- char uid[6];
- char gid[6];
- char mode[8];
- char size[10];
- char magic[2];
- } formated;
- } ar;
- static char *ar_long_names;
-
- if (fread(ar.raw, 1, 60, src_stream) != 60) {
- return(NULL);
- }
- archive_offset += 60;
- /* align the headers based on the header magic */
- if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
- /* some version of ar, have an extra '\n' after each data entry,
- * this puts the next header out by 1 */
- if (ar.formated.magic[1] != '`') {
- error_msg("Invalid magic");
- return(NULL);
- }
- /* read the next char out of what would be the data section,
- * if its a '\n' then it is a valid header offset by 1*/
- archive_offset++;
- if (fgetc(src_stream) != '\n') {
- error_msg("Invalid magic");
- return(NULL);
- }
- /* fix up the header, we started reading 1 byte too early */
- /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
- memmove(ar.raw, &ar.raw[1], 59);
- }
-
- typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
-
- typed->size = (size_t) atoi(ar.formated.size);
- /* long filenames have '/' as the first character */
- if (ar.formated.name[0] == '/') {
- if (ar.formated.name[1] == '/') {
- /* If the second char is a '/' then this entries data section
- * stores long filename for multiple entries, they are stored
- * in static variable long_names for use in future entries */
- ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
- fread(ar_long_names, 1, typed->size, src_stream);
- archive_offset += typed->size;
- /* This ar entries data section only contained filenames for other records
- * they are stored in the static ar_long_names for future reference */
- return (get_header_ar(src_stream)); /* Return next header */
- } else if (ar.formated.name[1] == ' ') {
- /* This is the index of symbols in the file for compilers */
- seek_sub_file(src_stream, typed->size);
- return (get_header_ar(src_stream)); /* Return next header */
- } else {
- /* The number after the '/' indicates the offset in the ar data section
- (saved in variable long_name) that conatains the real filename */
- if (!ar_long_names) {
- error_msg("Cannot resolve long file name");
- return (NULL);
- }
- typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
- }
- } else {
- /* short filenames */
- typed->name = xcalloc(1, 16);
- strncpy(typed->name, ar.formated.name, 16);
- }
- typed->name[strcspn(typed->name, " /")]='\0';
-
- /* convert the rest of the now valid char header to its typed struct */
- parse_mode(ar.formated.mode, &typed->mode);
- typed->mtime = atoi(ar.formated.date);
- typed->uid = atoi(ar.formated.uid);
- typed->gid = atoi(ar.formated.gid);
-
- return(typed);
-}
-#endif
-
-#ifdef L_get_header_cpio
-struct hardlinks {
- file_header_t *entry;
- int inode;
- struct hardlinks *next;
-};
-
-file_header_t *get_header_cpio(FILE *src_stream)
-{
- file_header_t *cpio_entry = NULL;
- char cpio_header[110];
- int namesize;
- char dummy[16];
- int major, minor, nlink, inode;
- static struct hardlinks *saved_hardlinks = NULL;
- static int pending_hardlinks = 0;
-
- if (pending_hardlinks) { /* Deal with any pending hardlinks */
- struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
- while (tmp) {
- if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
- cpio_entry = tmp->entry;
- if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
- else saved_hardlinks = tmp->next;
- free(tmp);
- return (cpio_entry);
- }
- oldtmp = tmp;
- tmp = tmp->next;
- }
- pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
- }
-
- /* There can be padding before archive header */
- seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
- if (fread(cpio_header, 1, 110, src_stream) == 110) {
- archive_offset += 110;
- if (strncmp(cpio_header, "07070", 5) != 0) {
- error_msg("Unsupported format or invalid magic");
- return(NULL);
- }
- switch (cpio_header[5]) {
- case '2': /* "crc" header format */
- /* Doesnt do the crc check yet */
- case '1': /* "newc" header format */
- cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
- sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
- dummy, &inode, (unsigned int*)&cpio_entry->mode,
- (unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
- &nlink, &cpio_entry->mtime, &cpio_entry->size,
- dummy, &major, &minor, &namesize, dummy);
-
- cpio_entry->name = (char *) xcalloc(1, namesize);
- fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
- archive_offset += namesize;
- /* Skip padding before file contents */
- seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
- if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
- printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
- if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
- struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
- while (tmp) {
- error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
- oldtmp = tmp;
- tmp = tmp->next;
- free (oldtmp->entry->name);
- free (oldtmp->entry);
- free (oldtmp);
- }
- saved_hardlinks = NULL;
- pending_hardlinks = 0;
- }
- return(NULL);
- }
-
- if (S_ISLNK(cpio_entry->mode)) {
- cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
- fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
- archive_offset += cpio_entry->size;
- cpio_entry->size = 0; /* Stop possiable seeks in future */
- }
- if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
- if (cpio_entry->size == 0) { /* Put file on a linked list for later */
- struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
- new->next = saved_hardlinks;
- new->inode = inode;
- new->entry = cpio_entry;
- saved_hardlinks = new;
- return(get_header_cpio(src_stream)); /* Recurse to next file */
- } else { /* Found the file with data in */
- struct hardlinks *tmp = saved_hardlinks;
- pending_hardlinks = 1;
- while (tmp) {
- if (tmp->inode == inode) {
- tmp->entry->link_name = xstrdup(cpio_entry->name);
- nlink--;
- }
- tmp = tmp->next;
- }
- if (nlink > 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
- }
- }
- cpio_entry->device = (major << 8) | minor;
- break;
- default:
- error_msg("Unsupported format");
- return(NULL);
- }
- if (ferror(src_stream) || feof(src_stream)) {
- perror_msg("Stream error");
- return(NULL);
- }
- }
- return(cpio_entry);
-}
-#endif
-
-#ifdef L_get_header_tar
-file_header_t *get_header_tar(FILE *tar_stream)
-{
- union {
- unsigned char raw[512];
- struct {
- char name[100]; /* 0-99 */
- char mode[8]; /* 100-107 */
- char uid[8]; /* 108-115 */
- char gid[8]; /* 116-123 */
- char size[12]; /* 124-135 */
- char mtime[12]; /* 136-147 */
- char chksum[8]; /* 148-155 */
- char typeflag; /* 156-156 */
- char linkname[100]; /* 157-256 */
- char magic[6]; /* 257-262 */
- char version[2]; /* 263-264 */
- char uname[32]; /* 265-296 */
- char gname[32]; /* 297-328 */
- char devmajor[8]; /* 329-336 */
- char devminor[8]; /* 337-344 */
- char prefix[155]; /* 345-499 */
- char padding[12]; /* 500-512 */
- } formated;
- } tar;
- file_header_t *tar_entry = NULL;
- long sum = 0;
- long i;
-
- if (archive_offset % 512 != 0) {
- seek_sub_file(tar_stream, 512 - (archive_offset % 512));
- }
-
- if (fread(tar.raw, 1, 512, tar_stream) != 512) {
- /* Unfortunatly its common for tar files to have all sorts of
- * trailing garbage, fail silently */
-// error_msg("Couldnt read header");
- return(NULL);
- }
- archive_offset += 512;
-
- /* Check header has valid magic, unfortunately some tar files
- * have empty (0'ed) tar entries at the end, which will
- * cause this to fail, so fail silently for now
- */
- if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
- return(NULL);
- }
-
- /* Do checksum on headers */
- for (i = 0; i < 148 ; i++) {
- sum += tar.raw[i];
- }
- sum += ' ' * 8;
- for (i = 156; i < 512 ; i++) {
- sum += tar.raw[i];
- }
- if (sum != strtol(tar.formated.chksum, NULL, 8)) {
- error_msg("Invalid tar header checksum");
- return(NULL);
- }
-
- /* convert to type'ed variables */
- tar_entry = xcalloc(1, sizeof(file_header_t));
- tar_entry->name = xstrdup(tar.formated.name);
-
- parse_mode(tar.formated.mode, &tar_entry->mode);
- tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
- tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
- tar_entry->size = strtol(tar.formated.size, NULL, 8);
- tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
- tar_entry->link_name = strlen(tar.formated.linkname) ?
- xstrdup(tar.formated.linkname) : NULL;
- tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
- strtol(tar.formated.devminor, NULL, 8);
-
- return(tar_entry);
-}
-#endif
-
-#ifdef L_deb_extract
-char *deb_extract(const char *package_filename, FILE *out_stream,
- const int extract_function, const char *prefix, const char *filename)
-{
- FILE *deb_stream;
- FILE *uncompressed_stream = NULL;
- file_header_t *ar_header = NULL;
- char **file_list = NULL;
- char *output_buffer = NULL;
- char *ared_file = NULL;
- char ar_magic[8];
- int gunzip_pid;
-
- if (filename != NULL) {
- file_list = xmalloc(sizeof(char *) * 2);
- file_list[0] = xstrdup(filename);
- file_list[1] = NULL;
- }
-
- if (extract_function & extract_control_tar_gz) {
- ared_file = xstrdup("control.tar.gz");
- }
- else if (extract_function & extract_data_tar_gz) {
- ared_file = xstrdup("data.tar.gz");
- }
-
- /* open the debian package to be worked on */
- deb_stream = wfopen(package_filename, "r");
- if (deb_stream == NULL) {
- return(NULL);
- }
- /* set the buffer size */
- setvbuf(deb_stream, NULL, _IOFBF, 0x8000);
-
- /* check ar magic */
- fread(ar_magic, 1, 8, deb_stream);
- if (strncmp(ar_magic,"!<arch>",7) != 0) {
- error_msg_and_die("invalid magic");
- }
- archive_offset = 8;
-
- while ((ar_header = get_header_ar(deb_stream)) != NULL) {
- if (strcmp(ared_file, ar_header->name) == 0) {
- /* open a stream of decompressed data */
- uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
- archive_offset = 0;
- output_buffer = unarchive(uncompressed_stream, out_stream, get_header_tar, extract_function, prefix, file_list, NULL);
- }
- seek_sub_file(deb_stream, ar_header->size);
- free(ar_header->name);
- free(ar_header);
- }
- gz_close(gunzip_pid);
- fclose(deb_stream);
- fclose(uncompressed_stream);
- free(ared_file);
- if (filename != NULL) {
- free(file_list[0]);
- free(file_list);
- }
- return(output_buffer);
-}
-#endif
projects / oweals / busybox.git / commitdiff