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, 784 insertions, 0 deletions
diff --git a/src/libbb/.svn/text-base/unarchive.c.svn-base b/src/libbb/.svn/text-base/unarchive.c.svn-base new file mode 100644 index 0000000..5d4464f --- /dev/null +++ b/src/libbb/.svn/text-base/unarchive.c.svn-base @@ -0,0 +1,784 @@ +/* + * 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; +} |