1 /* $OpenBSD: diffdir.c,v 1.45 2015/10/05 20:15:00 millert Exp $ */
2
3 /*
4 * Copyright (c) 2003, 2010 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 *
18 * Sponsored in part by the Defense Advanced Research Projects
19 * Agency (DARPA) and Air Force Research Laboratory, Air Force
20 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
21 */
22
23 #include <sys/stat.h>
24
25 #include <dirent.h>
26 #include <err.h>
27 #include <errno.h>
28 #include <fnmatch.h>
29 #include <limits.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #include "diff.h"
36
37 static int selectfile(const struct dirent *);
38 static void diffit(struct dirent *, char *, size_t, struct dirent *,
39 char *, size_t, int);
40 static void print_only(const char *, size_t, const char *);
41
42 #define d_status d_type /* we need to store status for -l */
43
44 /*
45 * Diff directory traversal. Will be called recursively if -r was specified.
46 */
47 void
diffdir(char * p1,char * p2,int flags)48 diffdir(char *p1, char *p2, int flags)
49 {
50 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL;
51 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL;
52 size_t dirlen1, dirlen2;
53 char path1[PATH_MAX], path2[PATH_MAX];
54 int pos;
55
56 edp1 = edp2 = NULL;
57
58 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1));
59 if (dirlen1 >= sizeof(path1) - 1) {
60 warnc(ENAMETOOLONG, "%s", p1);
61 status |= 2;
62 return;
63 }
64 if (path1[dirlen1 - 1] != '/') {
65 path1[dirlen1++] = '/';
66 path1[dirlen1] = '\0';
67 }
68 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2));
69 if (dirlen2 >= sizeof(path2) - 1) {
70 warnc(ENAMETOOLONG, "%s", p2);
71 status |= 2;
72 return;
73 }
74 if (path2[dirlen2 - 1] != '/') {
75 path2[dirlen2++] = '/';
76 path2[dirlen2] = '\0';
77 }
78
79 /*
80 * Get a list of entries in each directory, skipping "excluded" files
81 * and sorting alphabetically.
82 */
83 pos = scandir(path1, &dirp1, selectfile, alphasort);
84 if (pos == -1) {
85 if (errno == ENOENT && (Nflag || Pflag)) {
86 pos = 0;
87 } else {
88 warn("%s", path1);
89 goto closem;
90 }
91 }
92 dp1 = dirp1;
93 edp1 = dirp1 + pos;
94
95 pos = scandir(path2, &dirp2, selectfile, alphasort);
96 if (pos == -1) {
97 if (errno == ENOENT && Nflag) {
98 pos = 0;
99 } else {
100 warn("%s", path2);
101 goto closem;
102 }
103 }
104 dp2 = dirp2;
105 edp2 = dirp2 + pos;
106
107 /*
108 * If we were given a starting point, find it.
109 */
110 if (start != NULL) {
111 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0)
112 dp1++;
113 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0)
114 dp2++;
115 }
116
117 /*
118 * Iterate through the two directory lists, diffing as we go.
119 */
120 while (dp1 != edp1 || dp2 != edp2) {
121 dent1 = dp1 != edp1 ? *dp1 : NULL;
122 dent2 = dp2 != edp2 ? *dp2 : NULL;
123
124 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 :
125 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) :
126 strcmp(dent1->d_name, dent2->d_name) ;
127 if (pos == 0) {
128 /* file exists in both dirs, diff it */
129 diffit(dent1, path1, dirlen1, dent2, path2, dirlen2, flags);
130 dp1++;
131 dp2++;
132 } else if (pos < 0) {
133 /* file only in first dir, only diff if -N */
134 if (Nflag) {
135 diffit(dent1, path1, dirlen1, dent2, path2,
136 dirlen2, flags);
137 } else {
138 print_only(path1, dirlen1, dent1->d_name);
139 status |= 1;
140 }
141 dp1++;
142 } else {
143 /* file only in second dir, only diff if -N or -P */
144 if (Nflag || Pflag)
145 diffit(dent2, path1, dirlen1, dent1, path2,
146 dirlen2, flags);
147 else {
148 print_only(path2, dirlen2, dent2->d_name);
149 status |= 1;
150 }
151 dp2++;
152 }
153 }
154
155 closem:
156 if (dirp1 != NULL) {
157 for (dp1 = dirp1; dp1 < edp1; dp1++)
158 free(*dp1);
159 free(dirp1);
160 }
161 if (dirp2 != NULL) {
162 for (dp2 = dirp2; dp2 < edp2; dp2++)
163 free(*dp2);
164 free(dirp2);
165 }
166 }
167
168 /*
169 * Do the actual diff by calling either diffreg() or diffdir().
170 */
171 static void
diffit(struct dirent * dp,char * path1,size_t plen1,struct dirent * dp2,char * path2,size_t plen2,int flags)172 diffit(struct dirent *dp, char *path1, size_t plen1, struct dirent *dp2,
173 char *path2, size_t plen2, int flags)
174 {
175 flags |= D_HEADER;
176 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1);
177
178 /*
179 * If we are ignoring file case, use dent2s name here if both names are
180 * the same apart from case.
181 */
182 if (ignore_file_case && strcasecmp(dp2->d_name, dp2->d_name) == 0)
183 strlcpy(path2 + plen2, dp2->d_name, PATH_MAX - plen2);
184 else
185 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2);
186
187 if (noderef) {
188 if (lstat(path1, &stb1) != 0) {
189 if (!(Nflag || Pflag) || errno != ENOENT) {
190 warn("%s", path1);
191 return;
192 }
193 flags |= D_EMPTY1;
194 memset(&stb1, 0, sizeof(stb1));
195 }
196
197 if (lstat(path2, &stb2) != 0) {
198 if (!Nflag || errno != ENOENT) {
199 warn("%s", path2);
200 return;
201 }
202 flags |= D_EMPTY2;
203 memset(&stb2, 0, sizeof(stb2));
204 stb2.st_mode = stb1.st_mode;
205 }
206 if (stb1.st_mode == 0)
207 stb1.st_mode = stb2.st_mode;
208 if (S_ISLNK(stb1.st_mode) || S_ISLNK(stb2.st_mode)) {
209 if (S_ISLNK(stb1.st_mode) && S_ISLNK(stb2.st_mode)) {
210 char buf1[PATH_MAX];
211 char buf2[PATH_MAX];
212 ssize_t len1 = 0;
213 ssize_t len2 = 0;
214
215 len1 = readlink(path1, buf1, sizeof(buf1));
216 len2 = readlink(path2, buf2, sizeof(buf2));
217
218 if (len1 < 0 || len2 < 0) {
219 perror("reading links");
220 return;
221 }
222 buf1[len1] = '\0';
223 buf2[len2] = '\0';
224
225 if (len1 != len2 || strncmp(buf1, buf2, len1) != 0) {
226 printf("Symbolic links %s and %s differ\n",
227 path1, path2);
228 status |= 1;
229 }
230
231 return;
232 }
233
234 printf("File %s is a %s while file %s is a %s\n",
235 path1, S_ISLNK(stb1.st_mode) ? "symbolic link" :
236 (S_ISDIR(stb1.st_mode) ? "directory" :
237 (S_ISREG(stb1.st_mode) ? "file" : "error")),
238 path2, S_ISLNK(stb2.st_mode) ? "symbolic link" :
239 (S_ISDIR(stb2.st_mode) ? "directory" :
240 (S_ISREG(stb2.st_mode) ? "file" : "error")));
241 status |= 1;
242 return;
243 }
244 } else {
245 if (stat(path1, &stb1) != 0) {
246 if (!(Nflag || Pflag) || errno != ENOENT) {
247 warn("%s", path1);
248 return;
249 }
250 flags |= D_EMPTY1;
251 memset(&stb1, 0, sizeof(stb1));
252 }
253
254 if (stat(path2, &stb2) != 0) {
255 if (!Nflag || errno != ENOENT) {
256 warn("%s", path2);
257 return;
258 }
259 flags |= D_EMPTY2;
260 memset(&stb2, 0, sizeof(stb2));
261 stb2.st_mode = stb1.st_mode;
262 }
263 if (stb1.st_mode == 0)
264 stb1.st_mode = stb2.st_mode;
265 }
266 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
267 if (rflag)
268 diffdir(path1, path2, flags);
269 else
270 printf("Common subdirectories: %s and %s\n",
271 path1, path2);
272 return;
273 }
274 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode))
275 dp->d_status = D_SKIPPED1;
276 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
277 dp->d_status = D_SKIPPED2;
278 else
279 dp->d_status = diffreg(path1, path2, flags, 0);
280 print_status(dp->d_status, path1, path2, "");
281 }
282
283 /*
284 * Returns 1 if the directory entry should be included in the
285 * diff, else 0. Checks the excludes list.
286 */
287 static int
selectfile(const struct dirent * dp)288 selectfile(const struct dirent *dp)
289 {
290 struct excludes *excl;
291
292 if (dp->d_fileno == 0)
293 return (0);
294
295 /* always skip "." and ".." */
296 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
297 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
298 return (0);
299
300 /* check excludes list */
301 for (excl = excludes_list; excl != NULL; excl = excl->next)
302 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0)
303 return (0);
304
305 return (1);
306 }
307
308 void
print_only(const char * path,size_t dirlen,const char * entry)309 print_only(const char *path, size_t dirlen, const char *entry)
310 {
311 if (dirlen > 1)
312 dirlen--;
313 printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
314 }
315