diff options
Diffstat (limited to 'src/libbb/.svn/text-base/unarchive.c.svn-base')
| -rw-r--r-- | src/libbb/.svn/text-base/unarchive.c.svn-base | 784 |
1 files changed, 0 insertions, 784 deletions
diff --git a/src/libbb/.svn/text-base/unarchive.c.svn-base b/src/libbb/.svn/text-base/unarchive.c.svn-base deleted file mode 100644 index 5d4464f..0000000 --- a/src/libbb/.svn/text-base/unarchive.c.svn-base +++ /dev/null @@ -1,784 +0,0 @@ -/* - * 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 <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <utime.h> -#include <libgen.h> - -#include "libbb.h" - -#define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1 -#define CONFIG_FEATURE_TAR_GNU_EXTENSIONS - -#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS -static char *longname = NULL; -static char *linkname = NULL; -#endif - -off_t archive_offset; - -#define SEEK_BUF 4096 -static ssize_t -seek_by_read(FILE* fd, size_t len) -{ - ssize_t cc, total = 0; - char buf[SEEK_BUF]; - - while (len) { - cc = fread(buf, sizeof(buf[0]), - len > SEEK_BUF ? SEEK_BUF : len, - fd); - - total += cc; - len -= cc; - - if(feof(fd) || ferror(fd)) - break; - } - return total; -} - -static void -seek_sub_file(FILE *fd, const int count) -{ - archive_offset += count; - - /* Do not use fseek() on a pipe. It may fail with ESPIPE, leaving the - * stream at an undefined location. - */ - seek_by_read(fd, count); - - return; -} - - -/* 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 - */ -static char * -extract_archive(FILE *src_stream, FILE *out_stream, - const file_header_t *file_entry, const int function, - const char *prefix, - int *err) -{ - FILE *dst_stream = NULL; - char *full_name = NULL; - char *full_link_name = NULL; - char *buffer = NULL; - struct utimbuf t; - - *err = 0; - - /* 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) - /* Do nothing, current dir already exists. */ - return NULL; - } - full_name = xmalloc(strlen(prefix) + strlen(path) + 1); - strcpy(full_name, prefix); - strcat(full_name, path); - if ( file_entry->link_name ){ - full_link_name = xmalloc(strlen(prefix) + strlen(file_entry->link_name) + 1); - strcpy(full_link_name, prefix); - strcat(full_link_name, file_entry->link_name); - } - } else { - full_name = xstrdup(file_entry->name); - if ( file_entry->link_name ) - full_link_name = xstrdup(file_entry->link_name); - } - - - if (function & extract_to_stream) { - if (S_ISREG(file_entry->mode)) { - *err = 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; - goto cleanup; - } - } - 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) { - *err = -1; - error_msg("%s not created: newer or same age file exists", file_entry->name); - } - seek_sub_file(src_stream, file_entry->size); - goto cleanup; - } - } - 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) { - *err = -1; - 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(full_link_name, full_name) != 0) { - if ((function & extract_quiet) != extract_quiet) { - *err = -1; - perror_msg("Cannot link from %s to '%s'", - file_entry->name, file_entry->link_name); - } - } - } else { - if ((dst_stream = wfopen(full_name, "w")) == NULL) { - *err = -1; - seek_sub_file(src_stream, file_entry->size); - goto cleanup; - } - archive_offset += file_entry->size; - *err = 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) { - *err = -1; - perror_msg("Cannot make dir %s", full_name); - } - } - } - break; - case S_IFLNK: - if (symlink(file_entry->link_name, full_name) < 0) { - if ((function & extract_quiet) != extract_quiet) { - *err = -1; - perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name); - } - goto cleanup; - } - 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) { - *err = -1; - perror_msg("Cannot create node %s", file_entry->name); - } - goto cleanup; - } - break; - default: - *err = -1; - perror_msg("Don't know how to handle %s", full_name); - - } - - /* 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); - } - chown(full_name, file_entry->uid, file_entry->gid); - chmod(full_name, file_entry->mode); - } - } 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", file_entry->name); - } - -cleanup: - free(full_name); - if ( full_link_name ) - free(full_link_name); - - return buffer; -} - -static char * -unarchive(FILE *src_stream, FILE *out_stream, - file_header_t *(*get_headers)(FILE *), - void (*free_headers)(file_header_t *), - const int extract_function, - const char *prefix, - const char **extract_names, - int *err) -{ - file_header_t *file_entry; - int extract_flag; - int i; - char *buffer = NULL; - - *err = 0; - - archive_offset = 0; - while ((file_entry = get_headers(src_stream)) != NULL) { - extract_flag = TRUE; - - if (extract_names != NULL) { - int found_flag = FALSE; - char *p = file_entry->name; - - if (p[0] == '.' && p[1] == '/') - p += 2; - - for(i = 0; extract_names[i] != 0; i++) { - if (strcmp(extract_names[i], p) == 0) { - found_flag = TRUE; - break; - } - } - if (extract_function & extract_exclude_list) { - if (found_flag == TRUE) { - extract_flag = FALSE; - } - } else { - /* If its not found in the include list dont extract it */ - if (found_flag == FALSE) { - extract_flag = FALSE; - } - } - } - - if (extract_flag == TRUE) { - buffer = extract_archive(src_stream, out_stream, - file_entry, extract_function, - prefix, err); - *err = 0; /* XXX: ignore extraction errors */ - if (*err) { - free_headers(file_entry); - break; - } - } else { - /* seek past the data entry */ - seek_sub_file(src_stream, file_entry->size); - } - free_headers(file_entry); - } - - return buffer; -} - -static 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); -} - -static void -free_header_ar(file_header_t *ar_entry) -{ - if (ar_entry == NULL) - return; - - free(ar_entry->name); - if (ar_entry->link_name) - free(ar_entry->link_name); - - free(ar_entry); -} - - -static 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 i; - long sum = 0; - - if (archive_offset % 512 != 0) { - seek_sub_file(tar_stream, 512 - (archive_offset % 512)); - } - - if (fread(tar.raw, 1, 512, tar_stream) != 512) { - /* Unfortunately 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) { -#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY - if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0) -#endif - 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)) { - if ( strtol(tar.formated.chksum,NULL,8) != 0 ) - 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->mode = 07777 & strtol(tar.formated.mode, NULL, 8); - - 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->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) + - strtol(tar.formated.devminor, NULL, 8); - - /* Fix mode, used by the old format */ - switch (tar.formated.typeflag) { - /* hard links are detected as regular files with 0 size and a link name */ - case '1': - tar_entry->mode |= S_IFREG ; - break; - case 0: - case '0': - -# ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY - if (last_char_is(tar_entry->name, '/')) { - tar_entry->mode |= S_IFDIR; - } else -# endif - tar_entry->mode |= S_IFREG; - break; - case '2': - tar_entry->mode |= S_IFLNK; - break; - case '3': - tar_entry->mode |= S_IFCHR; - break; - case '4': - tar_entry->mode |= S_IFBLK; - break; - case '5': - tar_entry->mode |= S_IFDIR; - break; - case '6': - tar_entry->mode |= S_IFIFO; - break; -# ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS - case 'L': { - longname = xmalloc(tar_entry->size + 1); - if(fread(longname, tar_entry->size, 1, tar_stream) != 1) - return NULL; - longname[tar_entry->size] = '\0'; - archive_offset += tar_entry->size; - - return(get_header_tar(tar_stream)); - } - case 'K': { - linkname = xmalloc(tar_entry->size + 1); - if(fread(linkname, tar_entry->size, 1, tar_stream) != 1) - return NULL; - linkname[tar_entry->size] = '\0'; - archive_offset += tar_entry->size; - - return(get_header_tar(tar_stream)); - } - case 'D': - case 'M': - case 'N': - case 'S': - case 'V': - perror_msg("Ignoring GNU extension type %c", tar.formated.typeflag); -# endif - default: - perror_msg("Unknown typeflag: 0x%x", tar.formated.typeflag); - break; - - } - - -#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS - if (longname) { - tar_entry->name = longname; - longname = NULL; - } else -#endif - { - tar_entry->name = xstrndup(tar.formated.name, 100); - - if (tar.formated.prefix[0]) { - char *temp = tar_entry->name; - char *prefixTemp = xstrndup(tar.formated.prefix, 155); - tar_entry->name = concat_path_file(prefixTemp, temp); - free(temp); - free(prefixTemp); - } - } - - if (linkname) { - tar_entry->link_name = linkname; - linkname = NULL; - } else - { - tar_entry->link_name = *tar.formated.linkname != '\0' ? - xstrndup(tar.formated.linkname, 100) : NULL; - } - - return(tar_entry); -} - -static void -free_header_tar(file_header_t *tar_entry) -{ - if (tar_entry == NULL) - return; - - free(tar_entry->name); - if (tar_entry->link_name) - free(tar_entry->link_name); - - free(tar_entry); -} - -char * -deb_extract(const char *package_filename, FILE *out_stream, - const int extract_function, const char *prefix, - const char *filename, int *err) -{ - FILE *deb_stream = NULL; - file_header_t *ar_header = NULL; - const char **file_list = NULL; - char *output_buffer = NULL; - char *ared_file = NULL; - char ar_magic[8]; - int gz_err; - - *err = 0; - - if (filename != NULL) { - file_list = xmalloc(sizeof(char *) * 2); - file_list[0] = filename; - file_list[1] = NULL; - } - - if (extract_function & extract_control_tar_gz) { - ared_file = "control.tar.gz"; - } - else if (extract_function & extract_data_tar_gz) { - ared_file = "data.tar.gz"; - } else { - opkg_msg(ERROR, "Internal error: extract_function=%x\n", - extract_function); - *err = -1; - goto cleanup; - } - - /* open the debian package to be worked on */ - deb_stream = wfopen(package_filename, "r"); - if (deb_stream == NULL) { - *err = -1; - goto cleanup; - } - /* 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) { - archive_offset = 8; - - while ((ar_header = get_header_ar(deb_stream)) != NULL) { - if (strcmp(ared_file, ar_header->name) == 0) { - int gunzip_pid = 0; - FILE *uncompressed_stream; - /* open a stream of decompressed data */ - uncompressed_stream = gz_open(deb_stream, &gunzip_pid); - if (uncompressed_stream == NULL) { - *err = -1; - goto cleanup; - } - - archive_offset = 0; - output_buffer = unarchive(uncompressed_stream, - out_stream, get_header_tar, - free_header_tar, - extract_function, prefix, - file_list, err); - fclose(uncompressed_stream); - gz_err = gz_close(gunzip_pid); - if (gz_err) - *err = -1; - free_header_ar(ar_header); - break; - } - if (fseek(deb_stream, ar_header->size, SEEK_CUR) == -1) { - opkg_perror(ERROR, "Couldn't fseek into %s", package_filename); - *err = -1; - free_header_ar(ar_header); - goto cleanup; - } - free_header_ar(ar_header); - } - goto cleanup; - } else if (strncmp(ar_magic, "\037\213", 2) == 0) { - /* it's a gz file, let's assume it's an opkg */ - int unzipped_opkg_pid; - FILE *unzipped_opkg_stream; - file_header_t *tar_header; - archive_offset = 0; - if (fseek(deb_stream, 0, SEEK_SET) == -1) { - opkg_perror(ERROR, "Couldn't fseek into %s", package_filename); - *err = -1; - goto cleanup; - } - unzipped_opkg_stream = gz_open(deb_stream, &unzipped_opkg_pid); - if (unzipped_opkg_stream == NULL) { - *err = -1; - goto cleanup; - } - - /* walk through outer tar file to find ared_file */ - while ((tar_header = get_header_tar(unzipped_opkg_stream)) != NULL) { - int name_offset = 0; - if (strncmp(tar_header->name, "./", 2) == 0) - name_offset = 2; - if (strcmp(ared_file, tar_header->name+name_offset) == 0) { - int gunzip_pid = 0; - FILE *uncompressed_stream; - /* open a stream of decompressed data */ - uncompressed_stream = gz_open(unzipped_opkg_stream, &gunzip_pid); - if (uncompressed_stream == NULL) { - *err = -1; - goto cleanup; - } - archive_offset = 0; - - output_buffer = unarchive(uncompressed_stream, - out_stream, - get_header_tar, - free_header_tar, - extract_function, - prefix, - file_list, - err); - - free_header_tar(tar_header); - fclose(uncompressed_stream); - gz_err = gz_close(gunzip_pid); - if (gz_err) - *err = -1; - break; - } - seek_sub_file(unzipped_opkg_stream, tar_header->size); - free_header_tar(tar_header); - } - fclose(unzipped_opkg_stream); - gz_err = gz_close(unzipped_opkg_pid); - if (gz_err) - *err = -1; - - goto cleanup; - } else { - *err = -1; - error_msg("%s: invalid magic", package_filename); - } - -cleanup: - if (deb_stream) - fclose(deb_stream); - if (file_list) - free(file_list); - - return output_buffer; -} |