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/cdefs.h> 24 __FBSDID("$FreeBSD$"); 25 26 #include <sys/stat.h> 27 28 #include <dirent.h> 29 #include <err.h> 30 #include <errno.h> 31 #include <fnmatch.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <limits.h> 36 #include <unistd.h> 37 38 #include "diff.h" 39 40 static int selectfile(const struct dirent *); 41 static void diffit(struct dirent *, char *, size_t, char *, size_t, int); 42 static void print_only(const char *, size_t, const char *); 43 44 #define d_status d_type /* we need to store status for -l */ 45 46 /* 47 * Diff directory traversal. Will be called recursively if -r was specified. 48 */ 49 void 50 diffdir(char *p1, char *p2, int flags) 51 { 52 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; 53 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; 54 size_t dirlen1, dirlen2; 55 char path1[PATH_MAX], path2[PATH_MAX]; 56 int pos; 57 58 edp1 = edp2 = NULL; 59 60 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 61 if (dirlen1 >= sizeof(path1) - 1) { 62 warnc(ENAMETOOLONG, "%s", p1); 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 warnc(ENAMETOOLONG, "%s", p2); 73 status |= 2; 74 return; 75 } 76 if (path2[dirlen2 - 1] != '/') { 77 path2[dirlen2++] = '/'; 78 path2[dirlen2] = '\0'; 79 } 80 81 /* 82 * Get a list of entries in each directory, skipping "excluded" files 83 * and sorting alphabetically. 84 */ 85 pos = scandir(path1, &dirp1, selectfile, alphasort); 86 if (pos == -1) { 87 if (errno == ENOENT && (Nflag || Pflag)) { 88 pos = 0; 89 } else { 90 warn("%s", path1); 91 goto closem; 92 } 93 } 94 dp1 = dirp1; 95 edp1 = dirp1 + pos; 96 97 pos = scandir(path2, &dirp2, selectfile, alphasort); 98 if (pos == -1) { 99 if (errno == ENOENT && Nflag) { 100 pos = 0; 101 } else { 102 warn("%s", path2); 103 goto closem; 104 } 105 } 106 dp2 = dirp2; 107 edp2 = dirp2 + pos; 108 109 /* 110 * If we were given a starting point, find it. 111 */ 112 if (start != NULL) { 113 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 114 dp1++; 115 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 116 dp2++; 117 } 118 119 /* 120 * Iterate through the two directory lists, diffing as we go. 121 */ 122 while (dp1 != edp1 || dp2 != edp2) { 123 dent1 = dp1 != edp1 ? *dp1 : NULL; 124 dent2 = dp2 != edp2 ? *dp2 : NULL; 125 126 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 127 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) : 128 strcmp(dent1->d_name, dent2->d_name) ; 129 if (pos == 0) { 130 /* file exists in both dirs, diff it */ 131 diffit(dent1, path1, dirlen1, path2, dirlen2, flags); 132 dp1++; 133 dp2++; 134 } else if (pos < 0) { 135 /* file only in first dir, only diff if -N */ 136 if (Nflag) { 137 diffit(dent1, path1, dirlen1, path2, dirlen2, 138 flags); 139 } else { 140 print_only(path1, dirlen1, dent1->d_name); 141 status |= 1; 142 } 143 dp1++; 144 } else { 145 /* file only in second dir, only diff if -N or -P */ 146 if (Nflag || Pflag) 147 diffit(dent2, path1, dirlen1, path2, dirlen2, 148 flags); 149 else { 150 print_only(path2, dirlen2, dent2->d_name); 151 status |= 1; 152 } 153 dp2++; 154 } 155 } 156 157 closem: 158 if (dirp1 != NULL) { 159 for (dp1 = dirp1; dp1 < edp1; dp1++) 160 free(*dp1); 161 free(dirp1); 162 } 163 if (dirp2 != NULL) { 164 for (dp2 = dirp2; dp2 < edp2; dp2++) 165 free(*dp2); 166 free(dirp2); 167 } 168 } 169 170 /* 171 * Do the actual diff by calling either diffreg() or diffdir(). 172 */ 173 static void 174 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2, 175 int flags) 176 { 177 flags |= D_HEADER; 178 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 179 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 180 181 if (noderef) { 182 if (lstat(path1, &stb1) != 0) { 183 if (!(Nflag || Pflag) || errno != ENOENT) { 184 warn("%s", path1); 185 return; 186 } 187 flags |= D_EMPTY1; 188 memset(&stb1, 0, sizeof(stb1)); 189 } 190 191 if (lstat(path2, &stb2) != 0) { 192 if (!Nflag || errno != ENOENT) { 193 warn("%s", path2); 194 return; 195 } 196 flags |= D_EMPTY2; 197 memset(&stb2, 0, sizeof(stb2)); 198 stb2.st_mode = stb1.st_mode; 199 } 200 if (stb1.st_mode == 0) 201 stb1.st_mode = stb2.st_mode; 202 if (S_ISLNK(stb1.st_mode) || S_ISLNK(stb2.st_mode)) { 203 if (S_ISLNK(stb1.st_mode) && S_ISLNK(stb2.st_mode)) { 204 char buf1[PATH_MAX]; 205 char buf2[PATH_MAX]; 206 ssize_t len1 = 0; 207 ssize_t len2 = 0; 208 209 len1 = readlink(path1, buf1, sizeof(buf1)); 210 len2 = readlink(path2, buf2, sizeof(buf2)); 211 212 if (len1 < 0 || len2 < 0) { 213 perror("reading links"); 214 return; 215 } 216 buf1[len1] = '\0'; 217 buf2[len2] = '\0'; 218 219 if (len1 != len2 || strncmp(buf1, buf2, len1) != 0) { 220 printf("Symbolic links %s and %s differ\n", 221 path1, path2); 222 status |= 1; 223 } 224 225 return; 226 } 227 228 printf("File %s is a %s while file %s is a %s\n", 229 path1, S_ISLNK(stb1.st_mode) ? "symbolic link" : 230 (S_ISDIR(stb1.st_mode) ? "directory" : 231 (S_ISREG(stb1.st_mode) ? "file" : "error")), 232 path2, S_ISLNK(stb2.st_mode) ? "symbolic link" : 233 (S_ISDIR(stb2.st_mode) ? "directory" : 234 (S_ISREG(stb2.st_mode) ? "file" : "error"))); 235 status |= 1; 236 return; 237 } 238 } else { 239 if (stat(path1, &stb1) != 0) { 240 if (!(Nflag || Pflag) || errno != ENOENT) { 241 warn("%s", path1); 242 return; 243 } 244 flags |= D_EMPTY1; 245 memset(&stb1, 0, sizeof(stb1)); 246 } 247 248 if (stat(path2, &stb2) != 0) { 249 if (!Nflag || errno != ENOENT) { 250 warn("%s", path2); 251 return; 252 } 253 flags |= D_EMPTY2; 254 memset(&stb2, 0, sizeof(stb2)); 255 stb2.st_mode = stb1.st_mode; 256 } 257 if (stb1.st_mode == 0) 258 stb1.st_mode = stb2.st_mode; 259 } 260 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 261 if (rflag) 262 diffdir(path1, path2, flags); 263 else 264 printf("Common subdirectories: %s and %s\n", 265 path1, path2); 266 return; 267 } 268 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 269 dp->d_status = D_SKIPPED1; 270 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 271 dp->d_status = D_SKIPPED2; 272 else 273 dp->d_status = diffreg(path1, path2, flags, 0); 274 print_status(dp->d_status, path1, path2, ""); 275 } 276 277 /* 278 * Returns 1 if the directory entry should be included in the 279 * diff, else 0. Checks the excludes list. 280 */ 281 static int 282 selectfile(const struct dirent *dp) 283 { 284 struct excludes *excl; 285 286 if (dp->d_fileno == 0) 287 return (0); 288 289 /* always skip "." and ".." */ 290 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 291 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 292 return (0); 293 294 /* check excludes list */ 295 for (excl = excludes_list; excl != NULL; excl = excl->next) 296 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 297 return (0); 298 299 return (1); 300 } 301 302 void 303 print_only(const char *path, size_t dirlen, const char *entry) 304 { 305 if (dirlen > 1) 306 dirlen--; 307 printf("Only in %.*s: %s\n", (int)dirlen, path, entry); 308 } 309