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 #include <sys/stat.h> 25 26 #include <dirent.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <fnmatch.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <limits.h> 34 #include <unistd.h> 35 36 #include "diff.h" 37 38 static int selectfile(const struct dirent *); 39 static void diffit(struct dirent *, char *, size_t, struct dirent *, 40 char *, size_t, int); 41 static void print_only(const char *, size_t, const char *); 42 43 #define d_status d_type /* we need to store status for -l */ 44 45 /* 46 * Diff directory traversal. Will be called recursively if -r was specified. 47 */ 48 void 49 diffdir(char *p1, char *p2, int flags) 50 { 51 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; 52 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; 53 size_t dirlen1, dirlen2; 54 char path1[PATH_MAX], path2[PATH_MAX]; 55 int pos; 56 57 edp1 = edp2 = NULL; 58 59 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 60 if (dirlen1 >= sizeof(path1) - 1) { 61 warnc(ENAMETOOLONG, "%s", p1); 62 status |= 2; 63 return; 64 } 65 if (path1[dirlen1 - 1] != '/') { 66 path1[dirlen1++] = '/'; 67 path1[dirlen1] = '\0'; 68 } 69 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 70 if (dirlen2 >= sizeof(path2) - 1) { 71 warnc(ENAMETOOLONG, "%s", p2); 72 status |= 2; 73 return; 74 } 75 if (path2[dirlen2 - 1] != '/') { 76 path2[dirlen2++] = '/'; 77 path2[dirlen2] = '\0'; 78 } 79 80 /* 81 * Get a list of entries in each directory, skipping "excluded" files 82 * and sorting alphabetically. 83 */ 84 pos = scandir(path1, &dirp1, selectfile, alphasort); 85 if (pos == -1) { 86 if (errno == ENOENT && (Nflag || Pflag)) { 87 pos = 0; 88 } else { 89 warn("%s", path1); 90 goto closem; 91 } 92 } 93 dp1 = dirp1; 94 edp1 = dirp1 + pos; 95 96 pos = scandir(path2, &dirp2, selectfile, alphasort); 97 if (pos == -1) { 98 if (errno == ENOENT && Nflag) { 99 pos = 0; 100 } else { 101 warn("%s", path2); 102 goto closem; 103 } 104 } 105 dp2 = dirp2; 106 edp2 = dirp2 + pos; 107 108 /* 109 * If we were given a starting point, find it. 110 */ 111 if (start != NULL) { 112 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 113 dp1++; 114 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 115 dp2++; 116 } 117 118 /* 119 * Iterate through the two directory lists, diffing as we go. 120 */ 121 while (dp1 != edp1 || dp2 != edp2) { 122 dent1 = dp1 != edp1 ? *dp1 : NULL; 123 dent2 = dp2 != edp2 ? *dp2 : NULL; 124 125 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 126 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) : 127 strcmp(dent1->d_name, dent2->d_name) ; 128 if (pos == 0) { 129 /* file exists in both dirs, diff it */ 130 diffit(dent1, path1, dirlen1, dent2, path2, dirlen2, flags); 131 dp1++; 132 dp2++; 133 } else if (pos < 0) { 134 /* file only in first dir, only diff if -N */ 135 if (Nflag) { 136 diffit(dent1, path1, dirlen1, dent2, path2, 137 dirlen2, flags); 138 } else { 139 print_only(path1, dirlen1, dent1->d_name); 140 status |= 1; 141 } 142 dp1++; 143 } else { 144 /* file only in second dir, only diff if -N or -P */ 145 if (Nflag || Pflag) 146 diffit(dent2, path1, dirlen1, dent1, path2, 147 dirlen2, flags); 148 else { 149 print_only(path2, dirlen2, dent2->d_name); 150 status |= 1; 151 } 152 dp2++; 153 } 154 } 155 156 closem: 157 if (dirp1 != NULL) { 158 for (dp1 = dirp1; dp1 < edp1; dp1++) 159 free(*dp1); 160 free(dirp1); 161 } 162 if (dirp2 != NULL) { 163 for (dp2 = dirp2; dp2 < edp2; dp2++) 164 free(*dp2); 165 free(dirp2); 166 } 167 } 168 169 /* 170 * Do the actual diff by calling either diffreg() or diffdir(). 171 */ 172 static void 173 diffit(struct dirent *dp, char *path1, size_t plen1, struct dirent *dp2, 174 char *path2, size_t plen2, int flags) 175 { 176 flags |= D_HEADER; 177 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 178 179 /* 180 * If we are ignoring file case, use dent2s name here if both names are 181 * the same apart from case. 182 */ 183 if (ignore_file_case && strcasecmp(dp2->d_name, dp2->d_name) == 0) 184 strlcpy(path2 + plen2, dp2->d_name, PATH_MAX - plen2); 185 else 186 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 187 188 if (noderef) { 189 if (lstat(path1, &stb1) != 0) { 190 if (!(Nflag || Pflag) || errno != ENOENT) { 191 warn("%s", path1); 192 return; 193 } 194 flags |= D_EMPTY1; 195 memset(&stb1, 0, sizeof(stb1)); 196 } 197 198 if (lstat(path2, &stb2) != 0) { 199 if (!Nflag || errno != ENOENT) { 200 warn("%s", path2); 201 return; 202 } 203 flags |= D_EMPTY2; 204 memset(&stb2, 0, sizeof(stb2)); 205 stb2.st_mode = stb1.st_mode; 206 } 207 if (stb1.st_mode == 0) 208 stb1.st_mode = stb2.st_mode; 209 if (S_ISLNK(stb1.st_mode) || S_ISLNK(stb2.st_mode)) { 210 if (S_ISLNK(stb1.st_mode) && S_ISLNK(stb2.st_mode)) { 211 char buf1[PATH_MAX]; 212 char buf2[PATH_MAX]; 213 ssize_t len1 = 0; 214 ssize_t len2 = 0; 215 216 len1 = readlink(path1, buf1, sizeof(buf1)); 217 len2 = readlink(path2, buf2, sizeof(buf2)); 218 219 if (len1 < 0 || len2 < 0) { 220 perror("reading links"); 221 return; 222 } 223 buf1[len1] = '\0'; 224 buf2[len2] = '\0'; 225 226 if (len1 != len2 || strncmp(buf1, buf2, len1) != 0) { 227 printf("Symbolic links %s and %s differ\n", 228 path1, path2); 229 status |= 1; 230 } 231 232 return; 233 } 234 235 printf("File %s is a %s while file %s is a %s\n", 236 path1, S_ISLNK(stb1.st_mode) ? "symbolic link" : 237 (S_ISDIR(stb1.st_mode) ? "directory" : 238 (S_ISREG(stb1.st_mode) ? "file" : "error")), 239 path2, S_ISLNK(stb2.st_mode) ? "symbolic link" : 240 (S_ISDIR(stb2.st_mode) ? "directory" : 241 (S_ISREG(stb2.st_mode) ? "file" : "error"))); 242 status |= 1; 243 return; 244 } 245 } else { 246 if (stat(path1, &stb1) != 0) { 247 if (!(Nflag || Pflag) || errno != ENOENT) { 248 warn("%s", path1); 249 return; 250 } 251 flags |= D_EMPTY1; 252 memset(&stb1, 0, sizeof(stb1)); 253 } 254 255 if (stat(path2, &stb2) != 0) { 256 if (!Nflag || errno != ENOENT) { 257 warn("%s", path2); 258 return; 259 } 260 flags |= D_EMPTY2; 261 memset(&stb2, 0, sizeof(stb2)); 262 stb2.st_mode = stb1.st_mode; 263 } 264 if (stb1.st_mode == 0) 265 stb1.st_mode = stb2.st_mode; 266 } 267 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 268 if (rflag) 269 diffdir(path1, path2, flags); 270 else 271 printf("Common subdirectories: %s and %s\n", 272 path1, path2); 273 return; 274 } 275 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 276 dp->d_status = D_SKIPPED1; 277 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 278 dp->d_status = D_SKIPPED2; 279 else 280 dp->d_status = diffreg(path1, path2, flags, 0); 281 print_status(dp->d_status, path1, path2, ""); 282 } 283 284 /* 285 * Returns 1 if the directory entry should be included in the 286 * diff, else 0. Checks the excludes list. 287 */ 288 static int 289 selectfile(const struct dirent *dp) 290 { 291 struct excludes *excl; 292 293 if (dp->d_fileno == 0) 294 return (0); 295 296 /* always skip "." and ".." */ 297 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 298 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 299 return (0); 300 301 /* check excludes list */ 302 for (excl = excludes_list; excl != NULL; excl = excl->next) 303 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 304 return (0); 305 306 return (1); 307 } 308 309 void 310 print_only(const char *path, size_t dirlen, const char *entry) 311 { 312 if (dirlen > 1) 313 dirlen--; 314 printf("Only in %.*s: %s\n", (int)dirlen, path, entry); 315 } 316