1 | /*
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2 | * This program is free software; you can redistribute it and/or modify
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3 | * it under the terms of the GNU General Public License as published by
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4 | * the Free Software Foundation; either version 2 of the License, or
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5 | * (at your option) any later version.
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6 | *
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7 | * This program is distributed in the hope that it will be useful,
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8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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10 | * GNU General Public License for more details.
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11 | *
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12 | * You should have received a copy of the GNU General Public License
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13 | * along with this program; if not, write to the Free Software
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14 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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15 | */
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16 |
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17 | #include <sys/types.h>
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18 |
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19 | #include <errno.h>
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20 | #include <fcntl.h>
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21 | #include <stdlib.h>
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22 | #include <string.h>
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23 | #include <utime.h>
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24 | #include <unistd.h>
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25 | #include <stdlib.h>
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26 |
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27 | #include "libbb.h"
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28 | #include "unarchive.h"
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29 |
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30 | void data_extract_all(archive_handle_t *archive_handle)
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31 | {
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32 | file_header_t *file_header = archive_handle->file_header;
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33 | int dst_fd;
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34 | int res;
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35 |
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36 | if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
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37 | char *name = bb_xstrdup(file_header->name);
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38 | bb_make_directory (dirname(name), -1, FILEUTILS_RECUR);
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39 | free(name);
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40 | }
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41 |
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42 | /* Check if the file already exists */
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43 | if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
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44 | /* Remove the existing entry if it exists */
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45 | if (((file_header->mode & S_IFMT) != S_IFDIR) && (unlink(file_header->name) == -1) && (errno != ENOENT)) {
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46 | bb_perror_msg_and_die("Couldnt remove old file");
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47 | }
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48 | }
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49 | else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
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50 | /* Remove the existing entry if its older than the extracted entry */
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51 | struct stat statbuf;
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52 | if (lstat(file_header->name, &statbuf) == -1) {
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53 | if (errno != ENOENT) {
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54 | bb_perror_msg_and_die("Couldnt stat old file");
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55 | }
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56 | }
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57 | else if (statbuf.st_mtime <= file_header->mtime) {
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58 | if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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59 | bb_error_msg("%s not created: newer or same age file exists", file_header->name);
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60 | }
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61 | data_skip(archive_handle);
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62 | return;
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63 | }
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64 | else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
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65 | bb_perror_msg_and_die("Couldnt remove old file %s", file_header->name);
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66 | }
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67 | }
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68 |
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69 | /* Handle hard links separately
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70 | * We identified hard links as regular files of size 0 with a symlink */
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71 | if (S_ISREG(file_header->mode) && (file_header->link_name) && (file_header->size == 0)) {
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72 | /* hard link */
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73 | res = link(file_header->link_name, file_header->name);
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74 | if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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75 | bb_perror_msg("Couldnt create hard link");
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76 | }
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77 | } else {
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78 | /* Create the filesystem entry */
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79 | switch(file_header->mode & S_IFMT) {
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80 | case S_IFREG: {
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81 | /* Regular file */
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82 | dst_fd = bb_xopen(file_header->name, O_WRONLY | O_CREAT | O_EXCL);
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83 | bb_copyfd_size(archive_handle->src_fd, dst_fd, file_header->size);
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84 | close(dst_fd);
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85 | break;
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86 | }
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87 | case S_IFDIR:
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88 | res = mkdir(file_header->name, file_header->mode);
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89 | if ((errno != EISDIR) && (res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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90 | bb_perror_msg("extract_archive: %s", file_header->name);
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91 | }
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92 | break;
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93 | case S_IFLNK:
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94 | /* Symlink */
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95 | res = symlink(file_header->link_name, file_header->name);
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96 | if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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97 | bb_perror_msg("Cannot create symlink from %s to '%s'", file_header->name, file_header->link_name);
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98 | }
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99 | break;
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100 | case S_IFSOCK:
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101 | case S_IFBLK:
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102 | case S_IFCHR:
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103 | case S_IFIFO:
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104 | res = mknod(file_header->name, file_header->mode, file_header->device);
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105 | if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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106 | bb_perror_msg("Cannot create node %s", file_header->name);
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107 | }
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108 | break;
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109 | default:
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110 | bb_error_msg_and_die("Unrecognised file type");
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111 | }
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112 | }
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113 |
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114 | if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
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115 | lchown(file_header->name, file_header->uid, file_header->gid);
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116 | }
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117 | if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM) &&
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118 | (file_header->mode & S_IFMT) != S_IFLNK)
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119 | {
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120 | chmod(file_header->name, file_header->mode);
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121 | }
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122 |
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123 | if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
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124 | struct utimbuf t;
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125 | t.actime = t.modtime = file_header->mtime;
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126 | utime(file_header->name, &t);
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127 | }
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128 | }
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