1 /* $OpenBSD: diffdir.c,v 1.24 2003/07/21 23:28:00 millert 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 1.24 2003/07/21 23:28:00 millert 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 traveral. 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 printf("Only in %.*s: %s\n", (int)(dirlen1 - 1), 122 path1, dent1->d_name); 123 dp1++; 124 } else { 125 /* file only in second dir, only diff if -N or -P */ 126 if (Nflag || Pflag) 127 diffit(dent2, path1, dirlen1, path2, dirlen2); 128 else if (lflag) 129 dent2->d_status |= D_ONLY; 130 else 131 printf("Only in %.*s: %s\n", (int)(dirlen2 - 1), 132 path2, dent2->d_name); 133 dp2++; 134 } 135 } 136 if (lflag) { 137 path1[dirlen1] = '\0'; 138 path2[dirlen2] = '\0'; 139 for (dp1 = dirp1; (dent1 = *dp1) != NULL; dp1++) { 140 print_status(dent1->d_status, path1, path2, 141 dent1->d_name); 142 } 143 for (dp2 = dirp2; (dent2 = *dp2) != NULL; dp2++) { 144 if (dent2->d_status == D_ONLY) 145 print_status(dent2->d_status, path2, NULL, 146 dent2->d_name); 147 } 148 } 149 150 if (dirbuf1 != NULL) { 151 free(dirp1); 152 free(dirbuf1); 153 } 154 if (dirbuf2 != NULL) { 155 free(dirp2); 156 free(dirbuf2); 157 } 158 } 159 160 /* 161 * Read in a whole directory's worth of struct dirents, culling 162 * out the "excluded" ones. 163 * Returns an array of struct dirent *'s that point into the buffer 164 * returned via bufp. Caller is responsible for free()ing both of these. 165 */ 166 static struct dirent ** 167 slurpdir(char *path, char **bufp, int enoentok) 168 { 169 char *buf, *ebuf, *cp; 170 size_t bufsize; 171 long base; 172 int fd, nbytes, entries; 173 struct stat sb; 174 struct dirent **dirlist, *dp; 175 176 *bufp = NULL; 177 if ((fd = open(path, O_RDONLY, 0644)) == -1) { 178 static struct dirent *dummy; 179 180 if (!enoentok || errno != ENOENT) { 181 warn("%s", path); 182 return (NULL); 183 } 184 return (&dummy); 185 } 186 fstat(fd, &sb); 187 188 bufsize = sb.st_size; 189 if (bufsize < sb.st_blksize) 190 bufsize = sb.st_blksize; 191 buf = emalloc(bufsize); 192 193 nbytes = getdirentries(fd, buf, bufsize, &base); 194 if (nbytes <= 0) { 195 free(buf); 196 warn("%s", path); 197 return (NULL); 198 } 199 ebuf = buf + nbytes; 200 close(fd); 201 202 /* 203 * We now have all the directory entries in our buffer. 204 * However, in order to easily sort them we need to convert 205 * the buffer into an array. 206 */ 207 for (entries = 0, cp = buf; cp < ebuf; ) { 208 dp = (struct dirent *)cp; 209 if (dp->d_fileno != 0 && dp->d_type != DT_WHT) 210 entries++; 211 if (dp->d_reclen <= 0) 212 break; 213 cp += dp->d_reclen; 214 } 215 dirlist = emalloc(sizeof(struct dirent *) * (entries + 1)); 216 for (entries = 0, cp = buf; cp < ebuf; ) { 217 dp = (struct dirent *)cp; 218 if (dp->d_fileno != 0 && dp->d_type != DT_WHT && 219 !excluded(dp->d_name)) { 220 dp->d_status = 0; 221 dirlist[entries++] = dp; 222 } 223 if (dp->d_reclen <= 0) 224 break; 225 cp += dp->d_reclen; 226 } 227 dirlist[entries] = NULL; 228 229 qsort(dirlist, entries, sizeof(struct dir *), dircompare); 230 231 *bufp = buf; 232 return (dirlist); 233 } 234 235 /* 236 * Compare d_name in two dirent structures; for qsort(3). 237 */ 238 static int 239 dircompare(const void *vp1, const void *vp2) 240 { 241 struct dirent *dp1 = *((struct dirent **) vp1); 242 struct dirent *dp2 = *((struct dirent **) vp2); 243 244 return (strcmp(dp1->d_name, dp2->d_name)); 245 } 246 247 /* 248 * Do the actual diff by calling either diffreg() or diffdir(). 249 */ 250 static void 251 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2) 252 { 253 int flags = D_HEADER; 254 255 strlcpy(path1 + plen1, dp->d_name, MAXPATHLEN - plen1); 256 if (stat(path1, &stb1) != 0) { 257 if (!(Nflag || Pflag) || errno != ENOENT) { 258 warn("%s", path1); 259 return; 260 } 261 flags |= D_EMPTY1; 262 memset(&stb1, 0, sizeof(stb1)); 263 } 264 265 strlcpy(path2 + plen2, dp->d_name, MAXPATHLEN - plen2); 266 if (stat(path2, &stb2) != 0) { 267 if (!Nflag || errno != ENOENT) { 268 warn("%s", path2); 269 return; 270 } 271 flags |= D_EMPTY2; 272 memset(&stb2, 0, sizeof(stb2)); 273 stb2.st_mode = stb1.st_mode; 274 } 275 if (stb1.st_mode == 0) 276 stb1.st_mode = stb2.st_mode; 277 278 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 279 if (rflag) 280 diffdir(path1, path2); 281 else if (lflag) 282 dp->d_status |= D_COMMON; 283 else 284 printf("Common subdirectories: %s and %s\n", 285 path1, path2); 286 return; 287 } 288 dp->d_status = diffreg(path1, path2, flags); 289 if (!lflag) 290 print_status(dp->d_status, path1, path2, NULL); 291 } 292 293 /* 294 * Exclude the given directory entry? 295 */ 296 static int 297 excluded(const char *entry) 298 { 299 struct excludes *excl; 300 301 /* always skip "." and ".." */ 302 if (entry[0] == '.' && 303 (entry[1] == '\0' || (entry[1] == '.' && entry[2] == '\0'))) 304 return (1); 305 306 /* check excludes list */ 307 for (excl = excludes_list; excl != NULL; excl = excl->next) 308 if (fnmatch(excl->pattern, entry, FNM_PATHNAME) == 0) 309 return (1); 310 311 return (0); 312 } 313