1 | /* |
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2 | * $Id: undelete.c,v 1.30 2002-11-20 19:09:24 zacheiss Exp $ |
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3 | * |
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4 | * This program is part of a package including delete, undelete, |
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5 | * lsdel, expunge and purge. The software suite is meant as a |
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6 | * replacement for rm which allows for file recovery. |
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7 | * |
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8 | * Copyright (c) 1989 by the Massachusetts Institute of Technology. |
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9 | * For copying and distribution information, see the file "mit-copying.h." |
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10 | */ |
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11 | |
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12 | #if (!defined(lint) && !defined(SABER)) |
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13 | static char rcsid_undelete_c[] = "$Id: undelete.c,v 1.30 2002-11-20 19:09:24 zacheiss Exp $"; |
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14 | #endif |
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15 | |
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16 | #include <stdio.h> |
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17 | #include <sys/types.h> |
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18 | #include <dirent.h> |
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19 | #include <sys/param.h> |
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20 | #include <string.h> |
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21 | #include <com_err.h> |
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22 | #include <errno.h> |
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23 | #include "delete_errs.h" |
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24 | #include "pattern.h" |
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25 | #include "util.h" |
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26 | #include "directories.h" |
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27 | #include "undelete.h" |
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28 | #include "shell_regexp.h" |
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29 | #include "mit-copying.h" |
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30 | #include "errors.h" |
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31 | |
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32 | int interactive, recursive, verbose, directoriesonly, noop, force; |
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33 | |
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34 | |
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35 | main(argc, argv) |
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36 | int argc; |
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37 | char *argv[]; |
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38 | { |
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39 | extern char *optarg; |
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40 | extern int optind; |
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41 | int arg; |
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42 | int retval; |
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43 | |
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44 | #if defined(__APPLE__) && defined(__MACH__) |
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45 | add_error_table(&et_del_error_table); |
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46 | #else |
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47 | initialize_del_error_table(); |
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48 | #endif |
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49 | |
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50 | whoami = lastpart(argv[0]); |
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51 | interactive = recursive = verbose = directoriesonly = noop = force = 0; |
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52 | |
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53 | while ((arg = getopt(argc, argv, "firvnR")) != -1) { |
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54 | switch (arg) { |
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55 | case 'f': |
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56 | force++; |
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57 | break; |
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58 | case 'i': |
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59 | interactive++; |
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60 | break; |
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61 | case 'r': |
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62 | recursive++; |
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63 | if (directoriesonly) { |
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64 | fprintf(stderr, "%s: -r and -R and mutually exclusive.\n", |
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65 | whoami); |
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66 | usage(); |
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67 | exit(1); |
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68 | } |
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69 | break; |
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70 | case 'v': |
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71 | verbose++; |
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72 | break; |
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73 | case 'n': |
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74 | noop++; |
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75 | break; |
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76 | case 'R': |
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77 | directoriesonly++; |
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78 | if (recursive) { |
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79 | fprintf(stderr, "%s: -r and -R are mutually exclusive.\n", |
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80 | whoami); |
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81 | usage(); |
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82 | exit(1); |
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83 | } |
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84 | break; |
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85 | default: |
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86 | usage(); |
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87 | exit(1); |
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88 | } |
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89 | } |
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90 | |
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91 | report_errors = ! force; |
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92 | |
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93 | if (optind == argc) { |
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94 | if (interactive_mode()) |
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95 | error("interactive_mode"); |
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96 | } |
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97 | else while (optind < argc) { |
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98 | retval = undelete(argv[optind]); |
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99 | if (retval) |
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100 | error(argv[optind]); |
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101 | optind++; |
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102 | } |
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103 | exit(((! force) && error_occurred) ? 1 : 0); |
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104 | } |
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105 | |
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106 | |
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107 | |
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108 | interactive_mode() |
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109 | { |
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110 | char buf[MAXPATHLEN]; |
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111 | char *ptr; |
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112 | int status = 0; |
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113 | int retval; |
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114 | |
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115 | if (verbose) { |
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116 | printf("Enter the files to be undeleted, one file per line.\n"); |
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117 | printf("Hit <RETURN> on a line by itself to exit.\n\n"); |
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118 | } |
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119 | do { |
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120 | printf("%s: ", whoami); |
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121 | ptr = fgets(buf, MAXPATHLEN, stdin); |
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122 | if (! ptr) { |
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123 | printf("\n"); |
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124 | return status; |
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125 | } |
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126 | ptr = strchr(buf, '\n'); /* fgets breakage */ |
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127 | if (ptr) |
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128 | *ptr = '\0'; |
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129 | if (! *buf) |
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130 | return status; |
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131 | retval = undelete(buf); |
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132 | if (retval) { |
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133 | error(buf); |
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134 | status = retval; |
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135 | } |
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136 | } while (*buf); |
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137 | return status; |
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138 | } |
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139 | |
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140 | |
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141 | |
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142 | usage() |
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143 | { |
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144 | fprintf(stderr, "Usage: %s [ options ] [filename ...]\n", whoami); |
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145 | fprintf(stderr, "Options are:\n"); |
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146 | fprintf(stderr, " -r recursive\n"); |
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147 | fprintf(stderr, " -i interactive\n"); |
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148 | fprintf(stderr, " -f force\n"); |
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149 | fprintf(stderr, " -v verbose\n"); |
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150 | fprintf(stderr, " -n noop\n"); |
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151 | fprintf(stderr, " -R directories only (i.e. no recursion)\n"); |
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152 | fprintf(stderr, " -- end options and start filenames\n"); |
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153 | fprintf(stderr, "-r and -D are mutually exclusive\n"); |
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154 | } |
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155 | |
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156 | undelete(name) |
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157 | char *name; |
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158 | { |
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159 | char **found_files; |
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160 | int num_found; |
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161 | int status = 0; |
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162 | filerec *current; |
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163 | int retval; |
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164 | |
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165 | if (retval = get_the_files(name, &num_found, &found_files)) { |
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166 | error(name); |
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167 | return retval; |
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168 | } |
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169 | |
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170 | if (num_found) { |
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171 | if (retval = process_files(found_files, num_found)) { |
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172 | error(name); |
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173 | return retval; |
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174 | } |
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175 | if (*name == '/') |
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176 | current = get_root_tree(); |
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177 | else |
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178 | current = get_cwd_tree(); |
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179 | |
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180 | status = recurs_and_undelete(current); |
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181 | if (status) { |
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182 | error(name); |
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183 | return status; |
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184 | } |
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185 | } |
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186 | else { |
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187 | if (no_wildcards(name)) { |
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188 | set_error(ENOENT) |
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189 | } |
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190 | else |
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191 | set_error(DELETE_ENOMATCH); |
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192 | error(name); |
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193 | return error_code; |
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194 | } |
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195 | |
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196 | return status; |
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197 | } |
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198 | |
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199 | |
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200 | |
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201 | |
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202 | |
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203 | int recurs_and_undelete(leaf) |
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204 | filerec *leaf; |
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205 | { |
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206 | int status = 0; |
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207 | int retval; |
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208 | |
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209 | if (leaf->specified) { |
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210 | retval = do_undelete(leaf); |
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211 | if (retval) { |
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212 | error("do_undelete"); |
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213 | status = retval; |
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214 | } |
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215 | } |
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216 | |
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217 | if (! status) { /* recurse only if if top-level undelete */ |
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218 | /* succeeded or was not requested */ |
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219 | if (leaf->dirs) { |
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220 | retval = recurs_and_undelete(leaf->dirs); |
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221 | if (retval) { |
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222 | error("recurs_and_undelete"); |
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223 | status = retval; |
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224 | } |
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225 | } |
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226 | |
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227 | if (leaf->files) { |
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228 | retval = recurs_and_undelete(leaf->files); |
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229 | if (retval) { |
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230 | error("recurs_and_undelete"); |
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231 | status = retval; |
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232 | } |
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233 | } |
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234 | } |
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235 | |
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236 | if (leaf->next) { |
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237 | retval = recurs_and_undelete(leaf->next); |
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238 | if (retval) { |
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239 | error("recurs_and_undelete"); |
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240 | status = retval; |
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241 | } |
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242 | } |
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243 | |
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244 | free_leaf(leaf); |
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245 | |
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246 | return status; |
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247 | } |
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248 | |
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249 | |
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250 | |
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251 | |
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252 | |
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253 | |
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254 | int process_files(files, num) |
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255 | char **files; |
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256 | int num; |
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257 | { |
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258 | int i; |
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259 | listrec *filelist; |
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260 | struct filrec *not_needed; |
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261 | int retval; |
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262 | |
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263 | filelist = (listrec *) Malloc((unsigned) (sizeof(listrec) * num)); |
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264 | if ((! filelist) && num) |
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265 | { |
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266 | set_error(errno); |
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267 | error("process_files"); |
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268 | return error_code; |
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269 | } |
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270 | |
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271 | for (i = 0; i < num; i++) { |
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272 | filelist[i].real_name = Malloc((unsigned) (strlen(files[i]) + 1)); |
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273 | if (! filelist[i].real_name) { |
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274 | set_error(errno); |
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275 | error("process_files"); |
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276 | return error_code; |
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277 | } |
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278 | (void) strcpy(filelist[i].real_name, files[i]); |
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279 | filelist[i].user_name = Malloc((unsigned) (strlen(files[i]) + 1)); |
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280 | if (! filelist[i].user_name) { |
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281 | set_error(errno); |
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282 | error("process_files"); |
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283 | return error_code; |
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284 | } |
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285 | (void) convert_to_user_name(files[i], filelist[i].user_name); |
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286 | free(files[i]); |
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287 | } |
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288 | free((char *) files); |
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289 | |
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290 | if (retval = sort_files(filelist, num)) { |
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291 | error("sort_files"); |
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292 | return retval; |
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293 | } |
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294 | if (retval = unique(&filelist, &num)) { |
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295 | error("unique"); |
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296 | return retval; |
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297 | } |
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298 | if (retval = initialize_tree()) { |
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299 | error("initialize_tree"); |
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300 | return retval; |
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301 | } |
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302 | |
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303 | for (i = 0; i < num; i++) { |
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304 | if (retval = add_path_to_tree(filelist[i].real_name, ¬_needed)) { |
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305 | error("add_path_to_tree"); |
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306 | return retval; |
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307 | } |
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308 | else { |
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309 | free(filelist[i].real_name); |
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310 | free(filelist[i].user_name); |
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311 | } |
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312 | } |
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313 | free((char *) filelist); |
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314 | return 0; |
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315 | } |
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316 | |
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317 | |
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318 | |
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319 | |
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320 | |
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321 | |
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322 | |
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323 | |
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324 | do_undelete(file_ent) |
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325 | filerec *file_ent; |
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326 | { |
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327 | struct stat stat_buf; |
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328 | char user_name[MAXPATHLEN], real_name[MAXPATHLEN]; |
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329 | int retval; |
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330 | |
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331 | if (retval = get_leaf_path(file_ent, real_name)) { |
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332 | if (! force) |
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333 | fprintf(stderr, "%s: %s: %s\n", whoami, "get_leaf_path", |
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334 | error_message(retval)); |
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335 | return retval; |
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336 | } |
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337 | |
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338 | (void) convert_to_user_name(real_name, user_name); |
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339 | |
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340 | if (interactive) { |
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341 | if ((file_ent->specs.st_mode & S_IFMT) == S_IFDIR) |
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342 | printf("%s: Undelete directory %s? ", whoami, user_name); |
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343 | else |
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344 | printf("%s: Undelete %s? ", whoami, user_name); |
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345 | if (! yes()) { |
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346 | set_status(UNDEL_NOT_UNDELETED); |
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347 | return error_code; |
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348 | } |
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349 | } |
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350 | if (! lstat(user_name, &stat_buf)) if (! force) { |
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351 | printf("%s: An undeleted %s already exists.\n", whoami, user_name); |
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352 | printf("Do you wish to continue with the undelete and overwrite that version? "); |
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353 | if (! yes()) { |
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354 | set_status(UNDEL_NOT_UNDELETED); |
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355 | return error_code; |
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356 | } |
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357 | if (! noop) if (retval = unlink_completely(user_name)) { |
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358 | error(user_name); |
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359 | return retval; |
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360 | } |
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361 | } |
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362 | if (noop) { |
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363 | printf("%s: %s would be undeleted\n", whoami, user_name); |
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364 | return 0; |
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365 | } |
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366 | |
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367 | if (retval = do_file_rename(real_name, user_name)) { |
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368 | error("do_file_rename"); |
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369 | return retval; |
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370 | } |
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371 | else { |
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372 | if (verbose) |
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373 | printf("%s: %s undeleted\n", whoami, user_name); |
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374 | return 0; |
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375 | } |
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376 | } |
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377 | |
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378 | |
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379 | |
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380 | |
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381 | do_file_rename(real_name, user_name) |
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382 | char *real_name, *user_name; |
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383 | { |
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384 | char *ptr; |
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385 | int retval; |
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386 | char error_buf[MAXPATHLEN+MAXPATHLEN+14]; |
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387 | char old_name[MAXPATHLEN], new_name[MAXPATHLEN]; |
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388 | char buf[MAXPATHLEN]; |
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389 | |
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390 | (void) strcpy(old_name, real_name); |
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391 | (void) strcpy(new_name, real_name); |
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392 | |
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393 | ptr = strrindex(new_name, ".#"); |
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394 | (void) convert_to_user_name(ptr, ptr); |
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395 | (void) strcpy(ptr, firstpart(ptr, buf)); |
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396 | (void) strcpy(&old_name[ptr - new_name], |
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397 | firstpart(&old_name[ptr - new_name], buf)); |
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398 | if (rename(old_name, new_name)) { |
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399 | set_error(errno); |
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400 | (void) sprintf(error_buf, "renaming %s to %s", |
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401 | old_name, new_name); |
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402 | error(error_buf); |
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403 | return error_code; |
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404 | } |
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405 | if (ptr > new_name) { |
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406 | *--ptr = '\0'; |
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407 | old_name[ptr - new_name] = '\0'; |
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408 | } |
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409 | if (retval = change_path(real_name, user_name)) { |
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410 | error("change_path"); |
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411 | return retval; |
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412 | } |
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413 | |
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414 | return 0; |
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415 | } |
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416 | |
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417 | |
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418 | |
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419 | |
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420 | |
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421 | |
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422 | filecmp(arg1, arg2) |
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423 | const void *arg1, *arg2; |
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424 | { |
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425 | listrec *file1 = (listrec *) arg1, *file2 = (listrec *) arg2; |
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426 | |
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427 | return(strcmp(file1->user_name, file2->user_name)); |
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428 | } |
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429 | |
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430 | |
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431 | |
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432 | int sort_files(data, num_data) |
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433 | listrec *data; |
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434 | int num_data; |
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435 | { |
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436 | qsort(data, num_data, sizeof(listrec), filecmp); |
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437 | |
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438 | return 0; |
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439 | } |
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440 | |
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441 | |
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442 | |
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443 | |
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444 | |
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445 | int unique(the_files, number) |
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446 | listrec **the_files; |
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447 | int *number; |
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448 | { |
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449 | int i, last; |
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450 | int offset; |
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451 | listrec *files; |
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452 | |
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453 | files = *the_files; |
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454 | for (last = 0, i = 1; i < *number; i++) { |
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455 | if (! strcmp(files[last].user_name, files[i].user_name)) { |
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456 | int better; |
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457 | |
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458 | better = choose_better(files[last].real_name, |
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459 | files[i].real_name); |
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460 | if (better == 1) { /* the first one is better */ |
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461 | free (files[i].real_name); |
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462 | free (files[i].user_name); |
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463 | files[i].real_name = (char *) NULL; |
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464 | } |
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465 | else { |
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466 | free (files[last].real_name); |
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467 | free (files[last].user_name); |
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468 | files[last].real_name = (char *) NULL; |
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469 | last = i; |
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470 | } |
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471 | } |
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472 | else |
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473 | last = i; |
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474 | } |
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475 | |
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476 | for (offset = 0, i = 0; i + offset < *number; i++) { |
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477 | if (! files[i].real_name) |
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478 | offset++; |
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479 | if (i + offset < *number) |
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480 | files[i] = files[i + offset]; |
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481 | } |
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482 | *number -= offset; |
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483 | files = (listrec *) realloc((char *) files, |
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484 | (unsigned) (sizeof(listrec) * *number)); |
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485 | if ((! files) && *number) |
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486 | { |
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487 | set_error(errno); |
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488 | error("realloc"); |
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489 | return errno; |
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490 | } |
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491 | |
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492 | *the_files = files; |
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493 | return 0; |
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494 | } |
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495 | |
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496 | |
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497 | |
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498 | |
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499 | choose_better(str1, str2) |
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500 | char *str1, *str2; |
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501 | { |
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502 | char *pos1, *pos2; |
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503 | |
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504 | pos1 = strindex(str1, ".#"); |
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505 | pos2 = strindex(str2, ".#"); |
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506 | while (pos1 && pos2) { |
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507 | if (pos1 - str1 < pos2 - str2) |
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508 | return(2); |
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509 | else if (pos2 - str2 < pos1 - str1) |
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510 | return(1); |
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511 | pos1 = strindex(pos1 + 1, ".#"); |
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512 | pos2 = strindex(pos2 + 1, ".#"); |
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513 | } |
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514 | if (! pos1) |
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515 | return(1); |
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516 | else |
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517 | return(2); |
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518 | } |
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519 | |
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520 | |
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521 | |
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522 | |
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523 | |
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524 | unlink_completely(filename) |
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525 | char *filename; |
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526 | { |
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527 | char buf[MAXPATHLEN]; |
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528 | struct stat stat_buf; |
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529 | DIR *dirp; |
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530 | struct dirent *dp; |
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531 | int retval; |
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532 | int status = 0; |
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533 | |
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534 | if (lstat(filename, &stat_buf)) { |
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535 | set_error(errno); |
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536 | error(filename); |
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537 | return error_code; |
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538 | } |
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539 | |
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540 | if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) { |
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541 | dirp = Opendir(filename); |
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542 | if (! dirp) { |
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543 | set_error(errno); |
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544 | error(filename); |
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545 | return error_code; |
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546 | } |
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547 | |
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548 | for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) { |
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549 | if (is_dotfile(dp->d_name)) |
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550 | continue; |
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551 | (void) strcpy(buf, append(filename, dp->d_name)); |
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552 | if (retval = unlink_completely(buf)) { |
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553 | error(buf); |
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554 | status = retval; |
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555 | } |
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556 | } |
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557 | closedir(dirp); |
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558 | if (retval = rmdir(filename)) { |
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559 | set_error(errno); |
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560 | error(filename); |
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561 | return error_code; |
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562 | } |
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563 | } |
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564 | else if (retval = unlink(filename)) { |
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565 | set_error(errno); |
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566 | error(filename); |
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567 | return error_code; |
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568 | } |
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569 | |
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570 | return status; |
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571 | } |
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572 | |
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573 | |
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574 | |
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575 | |
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576 | int get_the_files(name, num_found, found) |
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577 | char *name; |
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578 | int *num_found; |
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579 | char ***found; |
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580 | { |
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581 | int retval; |
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582 | int options; |
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583 | |
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584 | options = FIND_DELETED; |
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585 | if (recursive) |
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586 | options |= RECURS_DELETED; |
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587 | if (! directoriesonly) |
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588 | options |= FIND_CONTENTS; |
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589 | |
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590 | retval = find_matches(name, num_found, found, options); |
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591 | if (retval) { |
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592 | error("find_matches"); |
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593 | return retval; |
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594 | } |
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595 | |
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596 | return 0; |
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597 | } |
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