diff options
Diffstat (limited to 'archival')
| -rw-r--r-- | archival/libunarchive/Makefile | 57 | ||||
| -rw-r--r-- | archival/libunarchive/deb_extract.c | 83 | ||||
| -rw-r--r-- | archival/libunarchive/get_header_ar.c | 106 | ||||
| -rw-r--r-- | archival/libunarchive/get_header_cpio.c | 136 | ||||
| -rw-r--r-- | archival/libunarchive/get_header_tar.c | 99 | ||||
| -rw-r--r-- | archival/libunarchive/seek_sub_file.c | 34 | ||||
| -rw-r--r-- | archival/libunarchive/unarchive.c | 241 |
7 files changed, 756 insertions, 0 deletions
diff --git a/archival/libunarchive/Makefile b/archival/libunarchive/Makefile new file mode 100644 index 000000000..0c7219dcd --- /dev/null +++ b/archival/libunarchive/Makefile @@ -0,0 +1,57 @@ +# Makefile for busybox +# +# Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org> +# +# 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 +# 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 +# + +TOPDIR :=../.. +L_TARGET := libunarchive.a + +obj-y := unarchive.o seek_sub_file.o +obj-n := +obj- := + +ifeq ($(CONFIG_DPKG),y) + obj-y += deb_extract.o get_header_ar.o get_header_tar.o +endif + +ifeq ($(CONFIG_DPKG_DEB),y) + obj-y += deb_extract.o get_header_ar.o get_header_tar.o +endif + +ifeq ($(CONFIG_AR),y) + obj-y += get_header_ar.o +endif + +ifeq ($(CONFIG_CPIO),y) + obj-y += get_header_cpio.o +endif + +ifeq ($(CONFIG_RPM2CPIO),y) + obj-y += get_header_cpio.o +endif + +ifeq ($(CONFIG_TAR),y) + obj-y += get_header_tar.o +endif + + +# Hand off to toplevel Rules.mak +include $(TOPDIR)/Rules.mak + +clean: + rm -f $(L_TARGET) *.o core + diff --git a/archival/libunarchive/deb_extract.c b/archival/libunarchive/deb_extract.c new file mode 100644 index 000000000..e5b5c9685 --- /dev/null +++ b/archival/libunarchive/deb_extract.c @@ -0,0 +1,83 @@ +/* + * 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 <stdlib.h> +#include <string.h> +#include "unarchive.h" +#include "libbb.h" + +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); +}
\ No newline at end of file diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c new file mode 100644 index 000000000..d2840e0e3 --- /dev/null +++ b/archival/libunarchive/get_header_ar.c @@ -0,0 +1,106 @@ +/* + * 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 <stdlib.h> +#include <string.h> +#include "unarchive.h" +#include "libbb.h" + +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); +}
\ No newline at end of file diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c new file mode 100644 index 000000000..a2136e441 --- /dev/null +++ b/archival/libunarchive/get_header_cpio.c @@ -0,0 +1,136 @@ +/* + * 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 <stdlib.h> +#include <string.h> +#include "unarchive.h" +#include "libbb.h" + +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); +}
\ No newline at end of file diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c new file mode 100644 index 000000000..639e2dc36 --- /dev/null +++ b/archival/libunarchive/get_header_tar.c @@ -0,0 +1,99 @@ +/* + * 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 <stdlib.h> +#include <string.h> +#include "unarchive.h" +#include "libbb.h" + +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); +}
\ No newline at end of file diff --git a/archival/libunarchive/seek_sub_file.c b/archival/libunarchive/seek_sub_file.c new file mode 100644 index 000000000..76cc0bc0c --- /dev/null +++ b/archival/libunarchive/seek_sub_file.c @@ -0,0 +1,34 @@ +/* + * 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> + +off_t archive_offset; + +void seek_sub_file(FILE *src_stream, const int count) +{ + /* Try to fseek as faster */ + archive_offset += count; + if (fseek(src_stream, count, SEEK_CUR) != 0 && errno == ESPIPE) { + int i; + for (i = 0; i < count; i++) { + fgetc(src_stream); + } + } + return; +}
\ No newline at end of file diff --git a/archival/libunarchive/unarchive.c b/archival/libunarchive/unarchive.c new file mode 100644 index 000000000..4a42eaf7d --- /dev/null +++ b/archival/libunarchive/unarchive.c @@ -0,0 +1,241 @@ +/* + * 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 <errno.h> +#include <fnmatch.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <utime.h> +#include "unarchive.h" +#include "libbb.h" + +/* 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 */ +} + +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); + free(file_entry->link_name); + free(file_entry); + } + return(buffer); +}
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