]>
Commit | Line | Data |
---|---|---|
183c73b0 TT |
1 | #define _FILE_OFFSET_BITS 64 |
2 | #define _LARGEFILE_SOURCE | |
3 | #define _LARGEFILE64_SOURCE | |
4 | ||
5 | #include <unistd.h> | |
6 | #ifndef _POSIX_SOURCE | |
7 | #define _POSIX_SOURCE | |
8 | #endif | |
9 | #include <stdio.h> | |
10 | #include <stdlib.h> | |
993c4555 | 11 | #ifdef HAVE_MALLOC_H |
183c73b0 | 12 | #include <malloc.h> |
993c4555 | 13 | #endif |
183c73b0 TT |
14 | #include <string.h> |
15 | #include <fcntl.h> | |
16 | #include <sys/param.h> | |
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
19 | #include <dirent.h> | |
20 | #include <time.h> | |
21 | #include <stddef.h> | |
22 | #include <errno.h> | |
23 | ||
24 | #ifndef S_ISLNK | |
25 | #define S_ISLNK(mode) (((mode) & (_S_IFMT)) == (_S_IFLNK)) | |
26 | #endif | |
27 | ||
28 | #ifndef PATH_MAX | |
29 | #define PATH_MAX 1024 | |
30 | #endif | |
31 | ||
32 | #define progver "%s: scan/change symbolic links - v1.3 - by Mark Lord\n\n" | |
33 | static char *progname; | |
34 | static int verbose = 0, fix_links = 0, recurse = 0, delete = 0, shorten = 0, | |
35 | testing = 0, single_fs = 1; | |
36 | ||
37 | /* | |
38 | * tidypath removes excess slashes and "." references from a path string | |
39 | */ | |
40 | ||
41 | static int substr (char *s, char *old, char *new) | |
42 | { | |
43 | char *tmp = NULL; | |
44 | int oldlen = strlen(old), newlen = 0; | |
45 | ||
46 | if (NULL == strstr(s, old)) | |
47 | return 0; | |
48 | ||
49 | if (new) | |
50 | newlen = strlen(new); | |
51 | ||
52 | if (newlen > oldlen) { | |
53 | if ((tmp = malloc(strlen(s))) == NULL) { | |
54 | fprintf(stderr, "no memory\n"); | |
55 | exit (1); | |
56 | } | |
57 | } | |
58 | ||
59 | while (NULL != (s = strstr(s, old))) { | |
60 | char *p, *old_s = s; | |
61 | ||
62 | if (new) { | |
63 | if (newlen > oldlen) | |
64 | old_s = strcpy(tmp, s); | |
65 | p = new; | |
66 | while (*p) | |
67 | *s++ = *p++; | |
68 | } | |
69 | p = old_s + oldlen; | |
70 | while ((*s++ = *p++)); | |
71 | } | |
72 | if (tmp) | |
73 | free(tmp); | |
74 | return 1; | |
75 | } | |
76 | ||
77 | ||
78 | static int tidy_path (char *path) | |
79 | { | |
80 | int tidied = 0; | |
81 | char *s, *p; | |
82 | ||
83 | s = path + strlen(path) - 1; | |
84 | if (s[0] != '/') { /* tmp trailing slash simplifies things */ | |
85 | s[1] = '/'; | |
86 | s[2] = '\0'; | |
87 | } | |
88 | while (substr(path, "/./", "/")) | |
89 | tidied = 1; | |
90 | while (substr(path, "//", "/")) | |
91 | tidied = 1; | |
92 | ||
93 | while ((p = strstr(path,"/../")) != NULL) { | |
94 | s = p+3; | |
95 | for (p--; p != path; p--) if (*p == '/') break; | |
96 | if (*p != '/') | |
97 | break; | |
98 | while ((*p++ = *s++)); | |
99 | tidied = 1; | |
100 | } | |
101 | if (*path == '\0') | |
102 | strcpy(path,"/"); | |
103 | p = path + strlen(path) - 1; | |
104 | if (p != path && *p == '/') | |
105 | *p-- = '\0'; /* remove tmp trailing slash */ | |
106 | while (p != path && *p == '/') { /* remove any others */ | |
107 | *p-- = '\0'; | |
108 | tidied = 1; | |
109 | } | |
110 | while (!strncmp(path,"./",2)) { | |
111 | for (p = path, s = path+2; (*p++ = *s++);); | |
112 | tidied = 1; | |
113 | } | |
114 | return tidied; | |
115 | } | |
116 | ||
117 | static int shorten_path (char *path, char *abspath) | |
118 | { | |
119 | static char dir[PATH_MAX]; | |
120 | int shortened = 0; | |
121 | char *p; | |
122 | ||
123 | /* get rid of unnecessary "../dir" sequences */ | |
124 | while (abspath && strlen(abspath) > 1 && (p = strstr(path,"../"))) { | |
125 | /* find innermost occurance of "../dir", and save "dir" */ | |
126 | int slashes = 2; | |
127 | char *a, *s, *d = dir; | |
128 | while ((s = strstr(p+3, "../"))) { | |
129 | ++slashes; | |
130 | p = s; | |
131 | } | |
132 | s = p+3; | |
133 | *d++ = '/'; | |
134 | while (*s && *s != '/') | |
135 | *d++ = *s++; | |
136 | *d++ = '/'; | |
137 | *d = '\0'; | |
138 | if (!strcmp(dir,"//")) | |
139 | break; | |
140 | /* note: p still points at ../dir */ | |
141 | if (*s != '/' || !*++s) | |
142 | break; | |
143 | a = abspath + strlen(abspath) - 1; | |
144 | while (slashes-- > 0) { | |
145 | if (a <= abspath) | |
146 | goto ughh; | |
147 | while (*--a != '/') { | |
148 | if (a <= abspath) | |
149 | goto ughh; | |
150 | } | |
151 | } | |
152 | if (strncmp(dir, a, strlen(dir))) | |
153 | break; | |
154 | while ((*p++ = *s++)); /* delete the ../dir */ | |
155 | shortened = 1; | |
156 | } | |
157 | ughh: | |
158 | return shortened; | |
159 | } | |
160 | ||
161 | ||
162 | static void fix_symlink (char *path, dev_t my_dev) | |
163 | { | |
164 | static char lpath[PATH_MAX], new[PATH_MAX], abspath[PATH_MAX]; | |
165 | char *p, *np, *lp, *tail, *msg; | |
166 | struct stat stbuf, lstbuf; | |
167 | int c, fix_abs = 0, fix_messy = 0, fix_long = 0; | |
168 | ||
169 | if ((c = readlink(path, lpath, sizeof(lpath))) == -1) { | |
170 | perror(path); | |
171 | return; | |
172 | } | |
173 | lpath[c] = '\0'; /* readlink does not null terminate it */ | |
174 | ||
175 | /* construct the absolute address of the link */ | |
176 | abspath[0] = '\0'; | |
177 | if (lpath[0] != '/') { | |
178 | strcat(abspath,path); | |
179 | c = strlen(abspath); | |
180 | if ((c > 0) && (abspath[c-1] == '/')) | |
181 | abspath[c-1] = '\0'; /* cut trailing / */ | |
182 | if ((p = strrchr(abspath,'/')) != NULL) | |
183 | *p = '\0'; /* cut last component */ | |
184 | strcat(abspath,"/"); | |
185 | } | |
186 | strcat(abspath,lpath); | |
187 | (void) tidy_path(abspath); | |
188 | ||
189 | /* check for various things */ | |
190 | if (stat(abspath, &stbuf) == -1) { | |
191 | printf("dangling: %s -> %s\n", path, lpath); | |
192 | if (delete) { | |
193 | if (unlink (path)) { | |
194 | perror(path); | |
195 | } else | |
196 | printf("deleted: %s -> %s\n", path, lpath); | |
197 | } | |
198 | return; | |
199 | } | |
200 | ||
201 | if (single_fs) | |
202 | lstat(abspath, &lstbuf); /* if the above didn't fail, then this shouldn't */ | |
203 | ||
204 | if (single_fs && lstbuf.st_dev != my_dev) { | |
205 | msg = "other_fs:"; | |
206 | } else if (lpath[0] == '/') { | |
207 | msg = "absolute:"; | |
208 | fix_abs = 1; | |
209 | } else if (verbose) { | |
210 | msg = "relative:"; | |
211 | } else | |
212 | msg = NULL; | |
213 | fix_messy = tidy_path(strcpy(new,lpath)); | |
214 | if (shorten) | |
215 | fix_long = shorten_path(new, path); | |
216 | if (!fix_abs) { | |
217 | if (fix_messy) | |
218 | msg = "messy: "; | |
219 | else if (fix_long) | |
220 | msg = "lengthy: "; | |
221 | } | |
222 | if (msg != NULL) | |
223 | printf("%s %s -> %s\n", msg, path, lpath); | |
224 | if (!(fix_links || testing) || !(fix_messy || fix_abs || fix_long)) | |
225 | return; | |
226 | ||
227 | if (fix_abs) { | |
228 | /* convert an absolute link to relative: */ | |
229 | /* point tail at first part of lpath that differs from path */ | |
230 | /* point p at first part of path that differs from lpath */ | |
231 | (void) tidy_path(lpath); | |
232 | tail = lp = lpath; | |
233 | p = path; | |
234 | while (*p && (*p == *lp)) { | |
235 | if (*lp++ == '/') { | |
236 | tail = lp; | |
237 | while (*++p == '/'); | |
238 | } | |
239 | } | |
240 | ||
241 | /* now create new, with "../"s followed by tail */ | |
242 | np = new; | |
243 | while (*p) { | |
244 | if (*p++ == '/') { | |
245 | *np++ = '.'; | |
246 | *np++ = '.'; | |
247 | *np++ = '/'; | |
248 | while (*p == '/') ++p; | |
249 | } | |
250 | } | |
251 | strcpy (np, tail); | |
252 | (void) tidy_path(new); | |
253 | if (shorten) (void) shorten_path(new, path); | |
254 | } | |
255 | shorten_path(new,path); | |
256 | if (!testing) { | |
257 | if (unlink (path)) { | |
258 | perror(path); | |
259 | return; | |
260 | } | |
261 | if (symlink(new, path)) { | |
262 | perror(path); | |
263 | return; | |
264 | } | |
265 | } | |
266 | printf("changed: %s -> %s\n", path, new); | |
267 | } | |
268 | ||
269 | static void dirwalk (char *path, int pathlen, dev_t dev) | |
270 | { | |
271 | char *name; | |
272 | DIR *dfd; | |
273 | static struct stat st; | |
274 | static struct dirent *dp; | |
275 | ||
276 | if ((dfd = opendir(path)) == NULL) { | |
277 | perror(path); | |
278 | return; | |
279 | } | |
280 | ||
281 | name = path + pathlen; | |
282 | if (*(name-1) != '/') | |
283 | *name++ = '/'; | |
284 | ||
285 | while ((dp = readdir(dfd)) != NULL ) { | |
286 | strcpy(name, dp->d_name); | |
287 | if (strcmp(name, ".") && strcmp(name,"..")) { | |
288 | if (lstat(path, &st) == -1) { | |
289 | perror(path); | |
290 | } else if (st.st_dev == dev) { | |
291 | if (S_ISLNK(st.st_mode)) { | |
292 | fix_symlink (path, dev); | |
293 | } else if (recurse && S_ISDIR(st.st_mode)) { | |
294 | dirwalk(path, strlen(path), dev); | |
295 | } | |
296 | } | |
297 | } | |
298 | } | |
299 | closedir(dfd); | |
300 | path[pathlen] = '\0'; | |
301 | } | |
302 | ||
303 | static void usage_error (void) | |
304 | { | |
305 | fprintf(stderr, progver, progname); | |
306 | fprintf(stderr, "Usage:\t%s [-cdorstv] LINK|DIR ...\n\n", progname); | |
307 | fprintf(stderr, "Flags:" | |
308 | "\t-c == change absolute/messy links to relative\n" | |
309 | "\t-d == delete dangling links\n" | |
310 | "\t-o == warn about links across file systems\n" | |
311 | "\t-r == recurse into subdirs\n" | |
312 | "\t-s == shorten lengthy links (displayed in output only when -c not specified)\n" | |
313 | "\t-t == show what would be done by -c\n" | |
314 | "\t-v == verbose (show all symlinks)\n\n"); | |
315 | exit(1); | |
316 | } | |
317 | ||
318 | int main(int argc, char **argv) | |
319 | { | |
320 | #if defined (_GNU_SOURCE) && defined (__GLIBC__) | |
321 | static char path[PATH_MAX+2]; | |
322 | char* cwd = get_current_dir_name(); | |
323 | #else | |
324 | static char path[PATH_MAX+2], cwd[PATH_MAX+2]; | |
325 | #endif | |
326 | int dircount = 0; | |
327 | char c, *p; | |
328 | ||
329 | if ((progname = (char *) strrchr(*argv, '/')) == NULL) | |
330 | progname = *argv; | |
331 | else | |
332 | progname++; | |
333 | ||
334 | #if defined (_GNU_SOURCE) && defined (__GLIBC__) | |
335 | if (NULL == cwd) { | |
336 | fprintf(stderr,"get_current_dir_name() failed\n"); | |
337 | #else | |
338 | if (NULL == getcwd(cwd,PATH_MAX)) { | |
339 | fprintf(stderr,"getcwd() failed\n"); | |
340 | #endif | |
341 | exit (1); | |
342 | } | |
343 | #if defined (_GNU_SOURCE) && defined (__GLIBC__) | |
344 | cwd = realloc(cwd, strlen(cwd)+2); | |
345 | if (cwd == NULL) { | |
346 | fprintf(stderr, "realloc() failed\n"); | |
347 | exit (1); | |
348 | } | |
349 | #endif | |
350 | if (!*cwd || cwd[strlen(cwd)-1] != '/') | |
351 | strcat(cwd,"/"); | |
352 | ||
353 | while (--argc) { | |
354 | p = *++argv; | |
355 | if (*p == '-') { | |
356 | if (*++p == '\0') | |
357 | usage_error(); | |
358 | while ((c = *p++)) { | |
359 | if (c == 'c') fix_links = 1; | |
360 | else if (c == 'd') delete = 1; | |
361 | else if (c == 'o') single_fs = 0; | |
362 | else if (c == 'r') recurse = 1; | |
363 | else if (c == 's') shorten = 1; | |
364 | else if (c == 't') testing = 1; | |
365 | else if (c == 'v') verbose = 1; | |
366 | else usage_error(); | |
367 | } | |
368 | } else { | |
369 | struct stat st; | |
370 | if (*p == '/') | |
371 | *path = '\0'; | |
372 | else | |
373 | strcpy(path,cwd); | |
374 | tidy_path(strcat(path, p)); | |
375 | if (lstat(path, &st) == -1) | |
376 | perror(path); | |
377 | else if (S_ISLNK(st.st_mode)) | |
378 | fix_symlink(path, st.st_dev); | |
379 | else | |
380 | dirwalk(path, strlen(path), st.st_dev); | |
381 | ++dircount; | |
382 | } | |
383 | } | |
384 | if (dircount == 0) | |
385 | usage_error(); | |
386 | exit (0); | |
387 | } |