1 /* $OpenBSD: diffdir.c,v 1.37 2010/07/17 00:00:32 ray 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 #include <sys/param.h> 24 #include <sys/stat.h> 25 26 #include <dirent.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <fnmatch.h> 31 #include <paths.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 37 #include "diff.h" 38 #include "xmalloc.h" 39 40 static int dircompare(const void *, const void *); 41 static int excluded(const char *); 42 static struct dirent **slurpdir(char *, char **, int); 43 static void diffit(struct dirent *, char *, size_t, char *, size_t, int); 44 45 #define d_status d_type /* we need to store status for -l */ 46 47 /* 48 * Diff directory traversal. Will be called recursively if -r was specified. 49 */ 50 void 51 diffdir(char *p1, char *p2, int flags) 52 { 53 struct dirent **dirp1, **dirp2, **dp1, **dp2; 54 struct dirent *dent1, *dent2; 55 size_t dirlen1, dirlen2; 56 char path1[MAXPATHLEN], path2[MAXPATHLEN]; 57 char *dirbuf1, *dirbuf2; 58 int pos; 59 60 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 61 if (dirlen1 >= sizeof(path1) - 1) { 62 warnx("%s: %s", p1, strerror(ENAMETOOLONG)); 63 status = 2; 64 return; 65 } 66 if (path1[dirlen1 - 1] != '/') { 67 path1[dirlen1++] = '/'; 68 path1[dirlen1] = '\0'; 69 } 70 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 71 if (dirlen2 >= sizeof(path2) - 1) { 72 warnx("%s: %s", p2, strerror(ENAMETOOLONG)); 73 status = 2; 74 return; 75 } 76 if (path2[dirlen2 - 1] != '/') { 77 path2[dirlen2++] = '/'; 78 path2[dirlen2] = '\0'; 79 } 80 81 /* get a list of the entries in each directory */ 82 dp1 = dirp1 = slurpdir(path1, &dirbuf1, Nflag + Pflag); 83 dp2 = dirp2 = slurpdir(path2, &dirbuf2, Nflag); 84 if (dirp1 == NULL || dirp2 == NULL) { 85 goto closem; 86 } 87 88 /* 89 * If we were given a starting point, find it. 90 */ 91 if (start != NULL) { 92 while (*dp1 != NULL && strcmp((*dp1)->d_name, start) < 0) 93 dp1++; 94 while (*dp2 != NULL && strcmp((*dp2)->d_name, start) < 0) 95 dp2++; 96 } 97 98 /* 99 * Iterate through the two directory lists, diffing as we go. 100 */ 101 while (*dp1 != NULL || *dp2 != NULL) { 102 dent1 = *dp1; 103 dent2 = *dp2; 104 105 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 106 strcmp(dent1->d_name, dent2->d_name); 107 if (pos == 0) { 108 /* file exists in both dirs, diff it */ 109 diffit(dent1, path1, dirlen1, path2, dirlen2, flags); 110 dp1++; 111 dp2++; 112 } else if (pos < 0) { 113 /* file only in first dir, only diff if -N */ 114 if (Nflag) 115 diffit(dent1, path1, dirlen1, path2, dirlen2, 116 flags); 117 else if (lflag) 118 dent1->d_status |= D_ONLY; 119 else 120 print_only(path1, dirlen1, dent1->d_name); 121 dp1++; 122 } else { 123 /* file only in second dir, only diff if -N or -P */ 124 if (Nflag || Pflag) 125 diffit(dent2, path1, dirlen1, path2, dirlen2, 126 flags); 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 closem: 149 if (dirbuf1 != NULL) { 150 xfree(dirp1); 151 xfree(dirbuf1); 152 } 153 if (dirbuf2 != NULL) { 154 xfree(dirp2); 155 xfree(dirbuf2); 156 } 157 } 158 159 /* 160 * Read in a whole directory's worth of struct dirents, culling 161 * out the "excluded" ones. 162 * Returns an array of struct dirent *'s that point into the buffer 163 * returned via bufp. Caller is responsible for free()ing both of these. 164 */ 165 static struct dirent ** 166 slurpdir(char *path, char **bufp, int enoentok) 167 { 168 char *buf, *ebuf, *cp; 169 size_t bufsize, have, need; 170 long base; 171 int fd, nbytes, entries; 172 struct stat sb; 173 struct dirent **dirlist, *dp; 174 175 *bufp = NULL; 176 if ((fd = open(path, O_RDONLY, 0644)) == -1) { 177 static struct dirent *dummy; 178 179 if (!enoentok || errno != ENOENT) { 180 warn("%s", path); 181 return (NULL); 182 } 183 return (&dummy); 184 } 185 if (fstat(fd, &sb) == -1) { 186 warn("%s", path); 187 close(fd); 188 return (NULL); 189 } 190 191 need = roundup(sb.st_blksize, sizeof(struct dirent)); 192 have = bufsize = roundup(MAX(sb.st_size, sb.st_blksize), 193 sizeof(struct dirent)) + need; 194 ebuf = buf = xmalloc(bufsize); 195 196 do { 197 if (have < need) { 198 bufsize += need; 199 have += need; 200 cp = xrealloc(buf, 1, bufsize); 201 ebuf = cp + (ebuf - buf); 202 buf = cp; 203 } 204 nbytes = getdirentries(fd, ebuf, have, &base); 205 if (nbytes == -1) { 206 warn("%s", path); 207 xfree(buf); 208 close(fd); 209 return (NULL); 210 } 211 ebuf += nbytes; 212 have -= nbytes; 213 } while (nbytes != 0); 214 close(fd); 215 216 /* 217 * We now have all the directory entries in our buffer. 218 * However, in order to easily sort them we need to convert 219 * the buffer into an array. 220 */ 221 for (entries = 0, cp = buf; cp < ebuf; ) { 222 dp = (struct dirent *)cp; 223 if (dp->d_fileno != 0) 224 entries++; 225 if (dp->d_reclen <= 0) 226 break; 227 cp += dp->d_reclen; 228 } 229 dirlist = xcalloc(sizeof(*dirlist), entries + 1); 230 for (entries = 0, cp = buf; cp < ebuf; ) { 231 dp = (struct dirent *)cp; 232 if (dp->d_fileno != 0 && !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 int flags) 266 { 267 flags |= D_HEADER; 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, flags); 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, ""); 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