1 /* $OpenBSD: diffdir.c,v 1.25 2003/10/07 23:37:27 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 1.25 2003/10/07 23:37:27 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 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; 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 fstat(fd, &sb); 185 186 bufsize = sb.st_size; 187 if (bufsize < sb.st_blksize) 188 bufsize = sb.st_blksize; 189 buf = emalloc(bufsize); 190 191 nbytes = getdirentries(fd, buf, bufsize, &base); 192 if (nbytes <= 0) { 193 free(buf); 194 warn("%s", path); 195 return (NULL); 196 } 197 ebuf = buf + nbytes; 198 close(fd); 199 200 /* 201 * We now have all the directory entries in our buffer. 202 * However, in order to easily sort them we need to convert 203 * the buffer into an array. 204 */ 205 for (entries = 0, cp = buf; cp < ebuf; ) { 206 dp = (struct dirent *)cp; 207 if (dp->d_fileno != 0 && dp->d_type != DT_WHT) 208 entries++; 209 if (dp->d_reclen <= 0) 210 break; 211 cp += dp->d_reclen; 212 } 213 dirlist = emalloc(sizeof(struct dirent *) * (entries + 1)); 214 for (entries = 0, cp = buf; cp < ebuf; ) { 215 dp = (struct dirent *)cp; 216 if (dp->d_fileno != 0 && dp->d_type != DT_WHT && 217 !excluded(dp->d_name)) { 218 dp->d_status = 0; 219 dirlist[entries++] = dp; 220 } 221 if (dp->d_reclen <= 0) 222 break; 223 cp += dp->d_reclen; 224 } 225 dirlist[entries] = NULL; 226 227 qsort(dirlist, entries, sizeof(struct dir *), dircompare); 228 229 *bufp = buf; 230 return (dirlist); 231 } 232 233 /* 234 * Compare d_name in two dirent structures; for qsort(3). 235 */ 236 static int 237 dircompare(const void *vp1, const void *vp2) 238 { 239 struct dirent *dp1 = *((struct dirent **) vp1); 240 struct dirent *dp2 = *((struct dirent **) vp2); 241 242 return (strcmp(dp1->d_name, dp2->d_name)); 243 } 244 245 /* 246 * Do the actual diff by calling either diffreg() or diffdir(). 247 */ 248 static void 249 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2) 250 { 251 int flags = D_HEADER; 252 253 strlcpy(path1 + plen1, dp->d_name, MAXPATHLEN - plen1); 254 if (stat(path1, &stb1) != 0) { 255 if (!(Nflag || Pflag) || errno != ENOENT) { 256 warn("%s", path1); 257 return; 258 } 259 flags |= D_EMPTY1; 260 memset(&stb1, 0, sizeof(stb1)); 261 } 262 263 strlcpy(path2 + plen2, dp->d_name, MAXPATHLEN - plen2); 264 if (stat(path2, &stb2) != 0) { 265 if (!Nflag || errno != ENOENT) { 266 warn("%s", path2); 267 return; 268 } 269 flags |= D_EMPTY2; 270 memset(&stb2, 0, sizeof(stb2)); 271 stb2.st_mode = stb1.st_mode; 272 } 273 if (stb1.st_mode == 0) 274 stb1.st_mode = stb2.st_mode; 275 276 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 277 if (rflag) 278 diffdir(path1, path2); 279 else if (lflag) 280 dp->d_status |= D_COMMON; 281 else 282 printf("Common subdirectories: %s and %s\n", 283 path1, path2); 284 return; 285 } 286 dp->d_status = diffreg(path1, path2, flags); 287 if (!lflag) 288 print_status(dp->d_status, path1, path2, NULL); 289 } 290 291 /* 292 * Exclude the given directory entry? 293 */ 294 static int 295 excluded(const char *entry) 296 { 297 struct excludes *excl; 298 299 /* always skip "." and ".." */ 300 if (entry[0] == '.' && 301 (entry[1] == '\0' || (entry[1] == '.' && entry[2] == '\0'))) 302 return (1); 303 304 /* check excludes list */ 305 for (excl = excludes_list; excl != NULL; excl = excl->next) 306 if (fnmatch(excl->pattern, entry, FNM_PATHNAME) == 0) 307 return (1); 308 309 return (0); 310 } 311