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 #include <sys/tree.h> 25 26 #include <dirent.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <fnmatch.h> 31 #include <limits.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 37 #include "diff.h" 38 39 static int selectfile(const struct dirent *); 40 static void diffit(struct dirent *, char *, size_t, struct dirent *, 41 char *, size_t, int); 42 static void print_only(const char *, size_t, const char *); 43 44 struct inode { 45 dev_t dev; 46 ino_t ino; 47 RB_ENTRY(inode) entry; 48 }; 49 50 static int 51 inodecmp(struct inode *a, struct inode *b) 52 { 53 return (a->dev < b->dev ? -1 : a->dev > b->dev ? 1 : 54 a->ino < b->ino ? -1 : a->ino > b->ino ? 1 : 0); 55 } 56 57 RB_HEAD(inodetree, inode); 58 static struct inodetree v1 = RB_INITIALIZER(&v1); 59 static struct inodetree v2 = RB_INITIALIZER(&v2); 60 RB_GENERATE_STATIC(inodetree, inode, entry, inodecmp); 61 62 static int 63 vscandir(struct inodetree *tree, const char *path, struct dirent ***dirp, 64 int (*selectf)(const struct dirent *), 65 int (*comparf)(const struct dirent **, const struct dirent **)) 66 { 67 struct stat sb; 68 struct inode *ino = NULL; 69 int fd = -1, ret, serrno; 70 71 if ((fd = open(path, O_DIRECTORY | O_RDONLY)) < 0 || 72 (ino = calloc(1, sizeof(*ino))) == NULL || 73 fstat(fd, &sb) != 0) 74 goto fail; 75 ino->dev = sb.st_dev; 76 ino->ino = sb.st_ino; 77 if (RB_FIND(inodetree, tree, ino)) { 78 free(ino); 79 close(fd); 80 warnx("%s: Directory loop detected", path); 81 *dirp = NULL; 82 return (0); 83 } 84 if ((ret = fdscandir(fd, dirp, selectf, comparf)) < 0) 85 goto fail; 86 RB_INSERT(inodetree, tree, ino); 87 close(fd); 88 return (ret); 89 fail: 90 serrno = errno; 91 if (ino != NULL) 92 free(ino); 93 if (fd >= 0) 94 close(fd); 95 errno = serrno; 96 return (-1); 97 } 98 99 /* 100 * Diff directory traversal. Will be called recursively if -r was specified. 101 */ 102 void 103 diffdir(char *p1, char *p2, int flags) 104 { 105 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; 106 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; 107 size_t dirlen1, dirlen2; 108 char path1[PATH_MAX], path2[PATH_MAX]; 109 int pos; 110 111 edp1 = edp2 = NULL; 112 113 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 114 if (dirlen1 >= sizeof(path1) - 1) { 115 warnc(ENAMETOOLONG, "%s", p1); 116 status |= 2; 117 return; 118 } 119 while (dirlen1 > 1 && path1[dirlen1 - 1] == '/') 120 path1[--dirlen1] = '\0'; 121 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 122 if (dirlen2 >= sizeof(path2) - 1) { 123 warnc(ENAMETOOLONG, "%s", p2); 124 status |= 2; 125 return; 126 } 127 while (dirlen2 > 1 && path2[dirlen2 - 1] == '/') 128 path2[--dirlen2] = '\0'; 129 130 /* 131 * Get a list of entries in each directory, skipping "excluded" files 132 * and sorting alphabetically. 133 */ 134 pos = vscandir(&v1, path1, &dirp1, selectfile, alphasort); 135 if (pos == -1) { 136 if (errno == ENOENT && (Nflag || Pflag)) { 137 pos = 0; 138 } else { 139 warn("%s", path1); 140 goto closem; 141 } 142 } 143 dp1 = dirp1; 144 edp1 = dirp1 + pos; 145 146 pos = vscandir(&v2, path2, &dirp2, selectfile, alphasort); 147 if (pos == -1) { 148 if (errno == ENOENT && Nflag) { 149 pos = 0; 150 } else { 151 warn("%s", path2); 152 goto closem; 153 } 154 } 155 dp2 = dirp2; 156 edp2 = dirp2 + pos; 157 158 /* 159 * If we were given a starting point, find it. 160 */ 161 if (start != NULL) { 162 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 163 dp1++; 164 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 165 dp2++; 166 } 167 168 /* 169 * Append separator so children's names can be appended directly. 170 */ 171 if (path1[dirlen1 - 1] != '/') { 172 path1[dirlen1++] = '/'; 173 path1[dirlen1] = '\0'; 174 } 175 if (path2[dirlen2 - 1] != '/') { 176 path2[dirlen2++] = '/'; 177 path2[dirlen2] = '\0'; 178 } 179 180 /* 181 * Iterate through the two directory lists, diffing as we go. 182 */ 183 while (dp1 != edp1 || dp2 != edp2) { 184 dent1 = dp1 != edp1 ? *dp1 : NULL; 185 dent2 = dp2 != edp2 ? *dp2 : NULL; 186 187 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 188 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) : 189 strcmp(dent1->d_name, dent2->d_name) ; 190 if (pos == 0) { 191 /* file exists in both dirs, diff it */ 192 diffit(dent1, path1, dirlen1, dent2, path2, dirlen2, flags); 193 dp1++; 194 dp2++; 195 } else if (pos < 0) { 196 /* file only in first dir, only diff if -N */ 197 if (Nflag) { 198 diffit(dent1, path1, dirlen1, dent2, path2, 199 dirlen2, flags); 200 } else { 201 print_only(path1, dirlen1, dent1->d_name); 202 status |= 1; 203 } 204 dp1++; 205 } else { 206 /* file only in second dir, only diff if -N or -P */ 207 if (Nflag || Pflag) 208 diffit(dent2, path1, dirlen1, dent1, path2, 209 dirlen2, flags); 210 else { 211 print_only(path2, dirlen2, dent2->d_name); 212 status |= 1; 213 } 214 dp2++; 215 } 216 } 217 218 closem: 219 if (dirp1 != NULL) { 220 for (dp1 = dirp1; dp1 < edp1; dp1++) 221 free(*dp1); 222 free(dirp1); 223 } 224 if (dirp2 != NULL) { 225 for (dp2 = dirp2; dp2 < edp2; dp2++) 226 free(*dp2); 227 free(dirp2); 228 } 229 } 230 231 /* 232 * Do the actual diff by calling either diffreg() or diffdir(). 233 */ 234 static void 235 diffit(struct dirent *dp, char *path1, size_t plen1, struct dirent *dp2, 236 char *path2, size_t plen2, int flags) 237 { 238 int rc; 239 240 flags |= D_HEADER; 241 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 242 243 /* 244 * If we are ignoring file case, use dent2s name here if both names are 245 * the same apart from case. 246 */ 247 if (ignore_file_case && strcasecmp(dp2->d_name, dp2->d_name) == 0) 248 strlcpy(path2 + plen2, dp2->d_name, PATH_MAX - plen2); 249 else 250 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 251 252 if (noderef) { 253 if (lstat(path1, &stb1) != 0) { 254 if (!(Nflag || Pflag) || errno != ENOENT) { 255 warn("%s", path1); 256 return; 257 } 258 flags |= D_EMPTY1; 259 memset(&stb1, 0, sizeof(stb1)); 260 } 261 if (lstat(path2, &stb2) != 0) { 262 if (!Nflag || errno != ENOENT) { 263 warn("%s", path2); 264 return; 265 } 266 flags |= D_EMPTY2; 267 memset(&stb2, 0, sizeof(stb2)); 268 stb2.st_mode = stb1.st_mode; 269 } 270 if (stb1.st_mode == 0) 271 stb1.st_mode = stb2.st_mode; 272 if (S_ISLNK(stb1.st_mode) || S_ISLNK(stb2.st_mode)) { 273 if (S_ISLNK(stb1.st_mode) && S_ISLNK(stb2.st_mode)) { 274 char buf1[PATH_MAX]; 275 char buf2[PATH_MAX]; 276 ssize_t len1 = 0; 277 ssize_t len2 = 0; 278 279 len1 = readlink(path1, buf1, sizeof(buf1)); 280 len2 = readlink(path2, buf2, sizeof(buf2)); 281 282 if (len1 < 0 || len2 < 0) { 283 perror("reading links"); 284 return; 285 } 286 buf1[len1] = '\0'; 287 buf2[len2] = '\0'; 288 289 if (len1 != len2 || strncmp(buf1, buf2, len1) != 0) { 290 printf("Symbolic links %s and %s differ\n", 291 path1, path2); 292 status |= 1; 293 } 294 295 return; 296 } 297 298 printf("File %s is a %s while file %s is a %s\n", 299 path1, S_ISLNK(stb1.st_mode) ? "symbolic link" : 300 (S_ISDIR(stb1.st_mode) ? "directory" : 301 (S_ISREG(stb1.st_mode) ? "file" : "error")), 302 path2, S_ISLNK(stb2.st_mode) ? "symbolic link" : 303 (S_ISDIR(stb2.st_mode) ? "directory" : 304 (S_ISREG(stb2.st_mode) ? "file" : "error"))); 305 status |= 1; 306 return; 307 } 308 } else { 309 if (stat(path1, &stb1) != 0) { 310 if (!(Nflag || Pflag) || errno != ENOENT) { 311 warn("%s", path1); 312 return; 313 } 314 flags |= D_EMPTY1; 315 memset(&stb1, 0, sizeof(stb1)); 316 } 317 if (stat(path2, &stb2) != 0) { 318 if (!Nflag || errno != ENOENT) { 319 warn("%s", path2); 320 return; 321 } 322 flags |= D_EMPTY2; 323 memset(&stb2, 0, sizeof(stb2)); 324 stb2.st_mode = stb1.st_mode; 325 } 326 if (stb1.st_mode == 0) 327 stb1.st_mode = stb2.st_mode; 328 } 329 if (stb1.st_dev == stb2.st_dev && stb1.st_ino == stb2.st_ino) 330 return; 331 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 332 if (rflag) 333 diffdir(path1, path2, flags); 334 else 335 printf("Common subdirectories: %s and %s\n", 336 path1, path2); 337 return; 338 } 339 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 340 rc = D_SKIPPED1; 341 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 342 rc = D_SKIPPED2; 343 else 344 rc = diffreg(path1, path2, flags, 0); 345 print_status(rc, path1, path2, ""); 346 } 347 348 /* 349 * Returns 1 if the directory entry should be included in the 350 * diff, else 0. Checks the excludes list. 351 */ 352 static int 353 selectfile(const struct dirent *dp) 354 { 355 struct excludes *excl; 356 357 if (dp->d_fileno == 0) 358 return (0); 359 360 /* always skip "." and ".." */ 361 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 362 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 363 return (0); 364 365 /* check excludes list */ 366 for (excl = excludes_list; excl != NULL; excl = excl->next) 367 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 368 return (0); 369 370 return (1); 371 } 372 373 void 374 print_only(const char *path, size_t dirlen, const char *entry) 375 { 376 if (dirlen > 1) 377 dirlen--; 378 printf("Only in %.*s: %s\n", (int)dirlen, path, entry); 379 } 380