1 /* $OpenBSD: diffdir.c,v 1.29 2004/11/26 20:09:56 otto Exp $ */ 2 3 /* 4 * Copyright (c) 2003 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 #ifndef lint 24 static const char rcsid[] = "$OpenBSD: diffdir.c,v 1.29 2004/11/26 20:09:56 otto Exp $"; 25 #endif /* not lint */ 26 27 #include <sys/param.h> 28 #include <sys/stat.h> 29 30 #include <dirent.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <fcntl.h> 34 #include <fnmatch.h> 35 #include <paths.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include "diff.h" 42 43 static int dircompare(const void *, const void *); 44 static int excluded(const char *); 45 static struct dirent **slurpdir(char *, char **, int); 46 static void diffit(struct dirent *, char *, size_t, char *, size_t); 47 48 #define d_status d_type /* we need to store status for -l */ 49 50 /* 51 * Diff directory traversal. Will be called recursively if -r was specified. 52 */ 53 void 54 diffdir(char *p1, char *p2) 55 { 56 struct dirent **dirp1, **dirp2, **dp1, **dp2; 57 struct dirent *dent1, *dent2; 58 size_t dirlen1, dirlen2; 59 char path1[MAXPATHLEN], path2[MAXPATHLEN]; 60 char *dirbuf1, *dirbuf2; 61 int pos; 62 63 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 64 if (dirlen1 >= sizeof(path1) - 1) { 65 warnx("%s: %s", p1, strerror(ENAMETOOLONG)); 66 status = 2; 67 return; 68 } 69 if (path1[dirlen1 - 1] != '/') { 70 path1[dirlen1++] = '/'; 71 path1[dirlen1] = '\0'; 72 } 73 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 74 if (dirlen2 >= sizeof(path2) - 1) { 75 warnx("%s: %s", p2, strerror(ENAMETOOLONG)); 76 status = 2; 77 return; 78 } 79 if (path2[dirlen2 - 1] != '/') { 80 path2[dirlen2++] = '/'; 81 path2[dirlen2] = '\0'; 82 } 83 84 /* get a list of the entries in each directory */ 85 dp1 = dirp1 = slurpdir(path1, &dirbuf1, Nflag + Pflag); 86 dp2 = dirp2 = slurpdir(path2, &dirbuf2, Nflag); 87 if (dirp1 == NULL || dirp2 == NULL) 88 return; 89 90 /* 91 * If we were given a starting point, find it. 92 */ 93 if (start != NULL) { 94 while (*dp1 != NULL && strcmp((*dp1)->d_name, start) < 0) 95 dp1++; 96 while (*dp2 != NULL && strcmp((*dp2)->d_name, start) < 0) 97 dp2++; 98 } 99 100 /* 101 * Iterate through the two directory lists, diffing as we go. 102 */ 103 while (*dp1 != NULL || *dp2 != NULL) { 104 dent1 = *dp1; 105 dent2 = *dp2; 106 107 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 108 strcmp(dent1->d_name, dent2->d_name); 109 if (pos == 0) { 110 /* file exists in both dirs, diff it */ 111 diffit(dent1, path1, dirlen1, path2, dirlen2); 112 dp1++; 113 dp2++; 114 } else if (pos < 0) { 115 /* file only in first dir, only diff if -N */ 116 if (Nflag) 117 diffit(dent1, path1, dirlen1, path2, dirlen2); 118 else if (lflag) 119 dent1->d_status |= D_ONLY; 120 else 121 print_only(path1, dirlen1, dent1->d_name); 122 dp1++; 123 } else { 124 /* file only in second dir, only diff if -N or -P */ 125 if (Nflag || Pflag) 126 diffit(dent2, path1, dirlen1, path2, dirlen2); 127 else if (lflag) 128 dent2->d_status |= D_ONLY; 129 else 130 print_only(path2, dirlen2, dent2->d_name); 131 dp2++; 132 } 133 } 134 if (lflag) { 135 path1[dirlen1] = '\0'; 136 path2[dirlen2] = '\0'; 137 for (dp1 = dirp1; (dent1 = *dp1) != NULL; dp1++) { 138 print_status(dent1->d_status, path1, path2, 139 dent1->d_name); 140 } 141 for (dp2 = dirp2; (dent2 = *dp2) != NULL; dp2++) { 142 if (dent2->d_status == D_ONLY) 143 print_status(dent2->d_status, path2, NULL, 144 dent2->d_name); 145 } 146 } 147 148 if (dirbuf1 != NULL) { 149 free(dirp1); 150 free(dirbuf1); 151 } 152 if (dirbuf2 != NULL) { 153 free(dirp2); 154 free(dirbuf2); 155 } 156 } 157 158 /* 159 * Read in a whole directory's worth of struct dirents, culling 160 * out the "excluded" ones. 161 * Returns an array of struct dirent *'s that point into the buffer 162 * returned via bufp. Caller is responsible for free()ing both of these. 163 */ 164 static struct dirent ** 165 slurpdir(char *path, char **bufp, int enoentok) 166 { 167 char *buf, *ebuf, *cp; 168 size_t bufsize, have, need; 169 long base; 170 int fd, nbytes, entries; 171 struct stat sb; 172 struct dirent **dirlist, *dp; 173 174 *bufp = NULL; 175 if ((fd = open(path, O_RDONLY, 0644)) == -1) { 176 static struct dirent *dummy; 177 178 if (!enoentok || errno != ENOENT) { 179 warn("%s", path); 180 return (NULL); 181 } 182 return (&dummy); 183 } 184 if (fstat(fd, &sb) == -1) { 185 warn("%s", path); 186 close(fd); 187 return (NULL); 188 } 189 190 need = roundup(sb.st_blksize, sizeof(struct dirent)); 191 have = bufsize = roundup(MAX(sb.st_size, sb.st_blksize), 192 sizeof(struct dirent)) + need; 193 ebuf = buf = emalloc(bufsize); 194 195 do { 196 if (have < need) { 197 bufsize += need; 198 have += need; 199 cp = erealloc(buf, bufsize); 200 ebuf = cp + (ebuf - buf); 201 buf = cp; 202 } 203 nbytes = getdirentries(fd, ebuf, have, &base); 204 if (nbytes == -1) { 205 warn("%s", path); 206 free(buf); 207 close(fd); 208 return (NULL); 209 } 210 ebuf += nbytes; 211 have -= nbytes; 212 } while (nbytes != 0); 213 close(fd); 214 215 /* 216 * We now have all the directory entries in our buffer. 217 * However, in order to easily sort them we need to convert 218 * the buffer into an array. 219 */ 220 for (entries = 0, cp = buf; cp < ebuf; ) { 221 dp = (struct dirent *)cp; 222 if (dp->d_fileno != 0 && dp->d_type != DT_WHT) 223 entries++; 224 if (dp->d_reclen <= 0) 225 break; 226 cp += dp->d_reclen; 227 } 228 dirlist = emalloc(sizeof(struct dirent *) * (entries + 1)); 229 for (entries = 0, cp = buf; cp < ebuf; ) { 230 dp = (struct dirent *)cp; 231 if (dp->d_fileno != 0 && dp->d_type != DT_WHT && 232 !excluded(dp->d_name)) { 233 dp->d_status = 0; 234 dirlist[entries++] = dp; 235 } 236 if (dp->d_reclen <= 0) 237 break; 238 cp += dp->d_reclen; 239 } 240 dirlist[entries] = NULL; 241 242 qsort(dirlist, entries, sizeof(struct dirent *), dircompare); 243 244 *bufp = buf; 245 return (dirlist); 246 } 247 248 /* 249 * Compare d_name in two dirent structures; for qsort(3). 250 */ 251 static int 252 dircompare(const void *vp1, const void *vp2) 253 { 254 struct dirent *dp1 = *((struct dirent **) vp1); 255 struct dirent *dp2 = *((struct dirent **) vp2); 256 257 return (strcmp(dp1->d_name, dp2->d_name)); 258 } 259 260 /* 261 * Do the actual diff by calling either diffreg() or diffdir(). 262 */ 263 static void 264 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2) 265 { 266 int flags = D_HEADER; 267 268 strlcpy(path1 + plen1, dp->d_name, MAXPATHLEN - plen1); 269 if (stat(path1, &stb1) != 0) { 270 if (!(Nflag || Pflag) || errno != ENOENT) { 271 warn("%s", path1); 272 return; 273 } 274 flags |= D_EMPTY1; 275 memset(&stb1, 0, sizeof(stb1)); 276 } 277 278 strlcpy(path2 + plen2, dp->d_name, MAXPATHLEN - plen2); 279 if (stat(path2, &stb2) != 0) { 280 if (!Nflag || errno != ENOENT) { 281 warn("%s", path2); 282 return; 283 } 284 flags |= D_EMPTY2; 285 memset(&stb2, 0, sizeof(stb2)); 286 stb2.st_mode = stb1.st_mode; 287 } 288 if (stb1.st_mode == 0) 289 stb1.st_mode = stb2.st_mode; 290 291 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 292 if (rflag) 293 diffdir(path1, path2); 294 else if (lflag) 295 dp->d_status |= D_COMMON; 296 else 297 printf("Common subdirectories: %s and %s\n", 298 path1, path2); 299 return; 300 } 301 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 302 dp->d_status = D_SKIPPED1; 303 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 304 dp->d_status = D_SKIPPED2; 305 else 306 dp->d_status = diffreg(path1, path2, flags); 307 if (!lflag) 308 print_status(dp->d_status, path1, path2, NULL); 309 } 310 311 /* 312 * Exclude the given directory entry? 313 */ 314 static int 315 excluded(const char *entry) 316 { 317 struct excludes *excl; 318 319 /* always skip "." and ".." */ 320 if (entry[0] == '.' && 321 (entry[1] == '\0' || (entry[1] == '.' && entry[2] == '\0'))) 322 return (1); 323 324 /* check excludes list */ 325 for (excl = excludes_list; excl != NULL; excl = excl->next) 326 if (fnmatch(excl->pattern, entry, FNM_PATHNAME) == 0) 327 return (1); 328 329 return (0); 330 } 331