prevent find from ever descending into an xdev'ed directory.
[people/mcb30/busybox.git] / findutils / find.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini find implementation for busybox
4  *
5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6  *
7  * Reworked by David Douthitt <n9ubh@callsign.net> and
8  *  Matt Kraai <kraai@alumni.carnegiemellon.edu>.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23  *
24  */
25
26 #include <stdio.h>
27 #include <unistd.h>
28 #include <dirent.h>
29 #include <string.h>
30 #include <stdlib.h>
31 #include <fnmatch.h>
32 #include <time.h>
33 #include <ctype.h>
34 #include "busybox.h"
35
36 //XXX just found out about libbb/messages.c . maybe move stuff there ? - ghoz
37 static const char msg_req_arg[] = "option `%s' requires an argument";
38 static const char msg_invalid_arg[] = "invalid argument `%s' to `%s'";
39
40 static char *pattern;
41
42 #ifdef CONFIG_FEATURE_FIND_TYPE
43 static int type_mask = 0;
44 #endif
45
46 #ifdef CONFIG_FEATURE_FIND_PERM
47 static char perm_char = 0;
48 static int perm_mask = 0;
49 #endif
50
51 #ifdef CONFIG_FEATURE_FIND_MTIME
52 static char mtime_char;
53 static int mtime_days;
54 #endif
55
56 #ifdef CONFIG_FEATURE_FIND_MMIN
57 static char mmin_char;
58 static int mmin_mins;
59 #endif
60
61 #ifdef CONFIG_FEATURE_FIND_XDEV
62 static dev_t *xdev_dev;
63 static int xdev_count = 0;
64 #endif
65
66 #ifdef CONFIG_FEATURE_FIND_NEWER
67 static time_t newer_mtime;
68 #endif
69
70 #ifdef CONFIG_FEATURE_FIND_INUM
71 static ino_t inode_num;
72 #endif
73
74 #ifdef CONFIG_FEATURE_FIND_EXEC
75 static char **exec_str;
76 static int num_matches;
77 static int exec_opt;
78 #endif
79
80 static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
81 {
82 #ifdef CONFIG_FEATURE_FIND_XDEV
83         if (S_ISDIR(statbuf->st_mode) && xdev_count) {
84                 int i;
85                 for (i=0; i<xdev_count; i++) {
86                         if (xdev_dev[i] != statbuf->st_dev)
87                                 return SKIP;
88                 }
89         }
90 #endif
91         if (pattern != NULL) {
92                 const char *tmp = strrchr(fileName, '/');
93
94                 if (tmp == NULL)
95                         tmp = fileName;
96                 else
97                         tmp++;
98                 if (!(fnmatch(pattern, tmp, FNM_PERIOD) == 0))
99                         goto no_match;
100         }
101 #ifdef CONFIG_FEATURE_FIND_TYPE
102         if (type_mask != 0) {
103                 if (!((statbuf->st_mode & S_IFMT) == type_mask))
104                         goto no_match;
105         }
106 #endif
107 #ifdef CONFIG_FEATURE_FIND_PERM
108         if (perm_mask != 0) {
109                 if (!((isdigit(perm_char) && (statbuf->st_mode & 07777) == perm_mask) ||
110                          (perm_char == '-' && (statbuf->st_mode & perm_mask) == perm_mask) ||
111                          (perm_char == '+' && (statbuf->st_mode & perm_mask) != 0)))
112                         goto no_match;
113         }
114 #endif
115 #ifdef CONFIG_FEATURE_FIND_MTIME
116         if (mtime_char != 0) {
117                 time_t file_age = time(NULL) - statbuf->st_mtime;
118                 time_t mtime_secs = mtime_days * 24 * 60 * 60;
119                 if (!((isdigit(mtime_char) && file_age >= mtime_secs &&
120                                                 file_age < mtime_secs + 24 * 60 * 60) ||
121                                 (mtime_char == '+' && file_age >= mtime_secs + 24 * 60 * 60) ||
122                                 (mtime_char == '-' && file_age < mtime_secs)))
123                         goto no_match;
124         }
125 #endif
126 #ifdef CONFIG_FEATURE_FIND_MMIN
127         if (mmin_char != 0) {
128                 time_t file_age = time(NULL) - statbuf->st_mtime;
129                 time_t mmin_secs = mmin_mins * 60;
130                 if (!((isdigit(mmin_char) && file_age >= mmin_secs &&
131                                                 file_age < mmin_secs + 60) ||
132                                 (mmin_char == '+' && file_age >= mmin_secs + 60) ||
133                                 (mmin_char == '-' && file_age < mmin_secs)))
134                         goto no_match;
135         }
136 #endif
137 #ifdef CONFIG_FEATURE_FIND_NEWER
138         if (newer_mtime != 0) {
139                 time_t file_age = newer_mtime - statbuf->st_mtime;
140                 if (file_age >= 0)
141                         goto no_match;
142         }
143 #endif
144 #ifdef CONFIG_FEATURE_FIND_INUM
145         if (inode_num != 0) {
146                 if (!(statbuf->st_ino == inode_num))
147                         goto no_match;
148         }
149 #endif
150 #ifdef CONFIG_FEATURE_FIND_EXEC
151         if (exec_opt) {
152                 int i;
153                 char *cmd_string = "";
154                 for (i = 0; i < num_matches; i++)
155                         cmd_string = bb_xasprintf("%s%s%s", cmd_string, exec_str[i], fileName);
156                 cmd_string = bb_xasprintf("%s%s", cmd_string, exec_str[num_matches]);
157                 system(cmd_string);
158                 goto no_match;
159         }
160 #endif
161
162         puts(fileName);
163 no_match:
164         return (TRUE);
165 }
166
167 #ifdef CONFIG_FEATURE_FIND_TYPE
168 static int find_type(char *type)
169 {
170         int mask = 0;
171
172         switch (type[0]) {
173                 case 'b':
174                         mask = S_IFBLK;
175                         break;
176                 case 'c':
177                         mask = S_IFCHR;
178                         break;
179                 case 'd':
180                         mask = S_IFDIR;
181                         break;
182                 case 'p':
183                         mask = S_IFIFO;
184                         break;
185                 case 'f':
186                         mask = S_IFREG;
187                         break;
188                 case 'l':
189                         mask = S_IFLNK;
190                         break;
191                 case 's':
192                         mask = S_IFSOCK;
193                         break;
194         }
195
196         if (mask == 0 || type[1] != '\0')
197                 bb_error_msg_and_die(msg_invalid_arg, type, "-type");
198
199         return mask;
200 }
201 #endif
202
203 int find_main(int argc, char **argv)
204 {
205         int dereference = FALSE;
206         int i, firstopt, status = EXIT_SUCCESS;
207
208         for (firstopt = 1; firstopt < argc; firstopt++) {
209                 if (argv[firstopt][0] == '-')
210                         break;
211         }
212
213         /* Parse any options */
214         for (i = firstopt; i < argc; i++) {
215                 if (strcmp(argv[i], "-follow") == 0)
216                         dereference = TRUE;
217                 else if (strcmp(argv[i], "-print") == 0) {
218                         ;
219                         }
220                 else if (strcmp(argv[i], "-name") == 0) {
221                         if (++i == argc)
222                                 bb_error_msg_and_die(msg_req_arg, "-name");
223                         pattern = argv[i];
224 #ifdef CONFIG_FEATURE_FIND_TYPE
225                 } else if (strcmp(argv[i], "-type") == 0) {
226                         if (++i == argc)
227                                 bb_error_msg_and_die(msg_req_arg, "-type");
228                         type_mask = find_type(argv[i]);
229 #endif
230 #ifdef CONFIG_FEATURE_FIND_PERM
231                 } else if (strcmp(argv[i], "-perm") == 0) {
232                         char *end;
233                         if (++i == argc)
234                                 bb_error_msg_and_die(msg_req_arg, "-perm");
235                         perm_mask = strtol(argv[i], &end, 8);
236                         if ((end[0] != '\0') || (perm_mask > 07777))
237                                 bb_error_msg_and_die(msg_invalid_arg, argv[i], "-perm");
238                         if ((perm_char = argv[i][0]) == '-')
239                                 perm_mask = -perm_mask;
240 #endif
241 #ifdef CONFIG_FEATURE_FIND_MTIME
242                 } else if (strcmp(argv[i], "-mtime") == 0) {
243                         char *end;
244                         if (++i == argc)
245                                 bb_error_msg_and_die(msg_req_arg, "-mtime");
246                         mtime_days = strtol(argv[i], &end, 10);
247                         if (end[0] != '\0')
248                                 bb_error_msg_and_die(msg_invalid_arg, argv[i], "-mtime");
249                         if ((mtime_char = argv[i][0]) == '-')
250                                 mtime_days = -mtime_days;
251 #endif
252 #ifdef CONFIG_FEATURE_FIND_MMIN
253                 } else if (strcmp(argv[i], "-mmin") == 0) {
254                         char *end;
255                         if (++i == argc)
256                                 bb_error_msg_and_die(msg_req_arg, "-mmin");
257                         mmin_mins = strtol(argv[i], &end, 10);
258                         if (end[0] != '\0')
259                                 bb_error_msg_and_die(msg_invalid_arg, argv[i], "-mmin");
260                         if ((mmin_char = argv[i][0]) == '-')
261                                 mmin_mins = -mmin_mins;
262 #endif
263 #ifdef CONFIG_FEATURE_FIND_XDEV
264                 } else if (strcmp(argv[i], "-xdev") == 0) {
265                         struct stat stbuf;
266
267                         xdev_count = ( firstopt - 1 ) ? ( firstopt - 1 ) : 1;
268                         xdev_dev = xmalloc ( xdev_count * sizeof( dev_t ));
269
270                         if ( firstopt == 1 ) {
271                                 xstat ( ".", &stbuf );
272                                 xdev_dev [0] = stbuf. st_dev;
273                         }
274                         else {
275
276                                 for (i = 1; i < firstopt; i++) {
277                                         xstat ( argv [i], &stbuf );
278                                         xdev_dev [i-1] = stbuf. st_dev;
279                                 }
280                         }
281 #endif
282 #ifdef CONFIG_FEATURE_FIND_NEWER
283                 } else if (strcmp(argv[i], "-newer") == 0) {
284                         struct stat stat_newer;
285                         if (++i == argc)
286                                 bb_error_msg_and_die(msg_req_arg, "-newer");
287                         xstat (argv[i], &stat_newer);
288                         newer_mtime = stat_newer.st_mtime;
289 #endif
290 #ifdef CONFIG_FEATURE_FIND_INUM
291                 } else if (strcmp(argv[i], "-inum") == 0) {
292                         char *end;
293                         if (++i == argc)
294                                 bb_error_msg_and_die(msg_req_arg, "-inum");
295                         inode_num = strtol(argv[i], &end, 10);
296                         if (end[0] != '\0')
297                                 bb_error_msg_and_die(msg_invalid_arg, argv[i], "-inum");
298 #endif
299 #ifdef CONFIG_FEATURE_FIND_EXEC
300                 } else if (strcmp(argv[i], "-exec") == 0) {
301                         int b_pos;
302                         char *cmd_string = "";
303
304                         while (i++) {
305                                 if (i == argc)
306                                         bb_error_msg_and_die(msg_req_arg, "-exec");
307                                 if (*argv[i] == ';')
308                                         break;
309                                 cmd_string = bb_xasprintf("%s %s", cmd_string, argv[i]);
310                         }
311
312                         if (*cmd_string == 0)
313                                 bb_error_msg_and_die(msg_req_arg, "-exec");
314                         cmd_string++;
315                         exec_str = xmalloc(sizeof(char *));
316
317                         while ((b_pos = strstr(cmd_string, "{}") - cmd_string), (b_pos >= 0)) {
318                                 num_matches++;
319                                 exec_str = xrealloc(exec_str, (num_matches + 1) * sizeof(char *));
320                                 exec_str[num_matches - 1] = bb_xstrndup(cmd_string, b_pos);
321                                 cmd_string += b_pos + 2;
322                         }
323                         exec_str[num_matches] = bb_xstrdup(cmd_string);
324                         exec_opt = 1;
325 #endif
326                 } else
327                         bb_show_usage();
328         }
329
330         if (firstopt == 1) {
331                 if (! recursive_action(".", TRUE, dereference, FALSE, fileAction,
332                                         fileAction, NULL))
333                         status = EXIT_FAILURE;
334         } else {
335                 for (i = 1; i < firstopt; i++) {
336                         if (! recursive_action(argv[i], TRUE, dereference, FALSE, fileAction,
337                                                 fileAction, NULL))
338                                 status = EXIT_FAILURE;
339                 }
340         }
341
342         return status;
343 }