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 <fcntl.h> 32 #include <fnmatch.h> 33 #include <paths.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <limits.h> 39 40 #include "diff.h" 41 #include "xmalloc.h" 42 43 static int selectfile(const struct dirent *); 44 static void diffit(struct dirent *, char *, size_t, char *, size_t, int); 45 46 #define d_status d_type /* we need to store status for -l */ 47 48 /* 49 * Diff directory traversal. Will be called recursively if -r was specified. 50 */ 51 void 52 diffdir(char *p1, char *p2, int flags) 53 { 54 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; 55 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; 56 size_t dirlen1, dirlen2; 57 char path1[PATH_MAX], path2[PATH_MAX]; 58 int pos; 59 60 edp1 = edp2 = NULL; 61 62 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 63 if (dirlen1 >= sizeof(path1) - 1) { 64 warnc(ENAMETOOLONG, "%s", p1); 65 status = 2; 66 return; 67 } 68 if (path1[dirlen1 - 1] != '/') { 69 path1[dirlen1++] = '/'; 70 path1[dirlen1] = '\0'; 71 } 72 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 73 if (dirlen2 >= sizeof(path2) - 1) { 74 warnc(ENAMETOOLONG, "%s", p2); 75 status = 2; 76 return; 77 } 78 if (path2[dirlen2 - 1] != '/') { 79 path2[dirlen2++] = '/'; 80 path2[dirlen2] = '\0'; 81 } 82 83 /* 84 * Get a list of entries in each directory, skipping "excluded" files 85 * and sorting alphabetically. 86 */ 87 pos = scandir(path1, &dirp1, selectfile, alphasort); 88 if (pos == -1) { 89 if (errno == ENOENT && (Nflag || Pflag)) { 90 pos = 0; 91 } else { 92 warn("%s", path1); 93 goto closem; 94 } 95 } 96 dp1 = dirp1; 97 edp1 = dirp1 + pos; 98 99 pos = scandir(path2, &dirp2, selectfile, alphasort); 100 if (pos == -1) { 101 if (errno == ENOENT && Nflag) { 102 pos = 0; 103 } else { 104 warn("%s", path2); 105 goto closem; 106 } 107 } 108 dp2 = dirp2; 109 edp2 = dirp2 + pos; 110 111 /* 112 * If we were given a starting point, find it. 113 */ 114 if (start != NULL) { 115 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 116 dp1++; 117 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 118 dp2++; 119 } 120 121 /* 122 * Iterate through the two directory lists, diffing as we go. 123 */ 124 while (dp1 != edp1 || dp2 != edp2) { 125 dent1 = dp1 != edp1 ? *dp1 : NULL; 126 dent2 = dp2 != edp2 ? *dp2 : NULL; 127 128 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 129 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) : 130 strcmp(dent1->d_name, dent2->d_name) ; 131 if (pos == 0) { 132 /* file exists in both dirs, diff it */ 133 diffit(dent1, path1, dirlen1, path2, dirlen2, flags); 134 dp1++; 135 dp2++; 136 } else if (pos < 0) { 137 /* file only in first dir, only diff if -N */ 138 if (Nflag) 139 diffit(dent1, path1, dirlen1, path2, dirlen2, 140 flags); 141 else 142 print_only(path1, dirlen1, dent1->d_name); 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 dp2++; 152 } 153 } 154 155 closem: 156 if (dirp1 != NULL) { 157 for (dp1 = dirp1; dp1 < edp1; dp1++) 158 free(*dp1); 159 free(dirp1); 160 } 161 if (dirp2 != NULL) { 162 for (dp2 = dirp2; dp2 < edp2; dp2++) 163 free(*dp2); 164 free(dirp2); 165 } 166 } 167 168 /* 169 * Do the actual diff by calling either diffreg() or diffdir(). 170 */ 171 static void 172 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2, 173 int flags) 174 { 175 flags |= D_HEADER; 176 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 177 if (stat(path1, &stb1) != 0) { 178 if (!(Nflag || Pflag) || errno != ENOENT) { 179 warn("%s", path1); 180 return; 181 } 182 flags |= D_EMPTY1; 183 memset(&stb1, 0, sizeof(stb1)); 184 } 185 186 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 187 if (stat(path2, &stb2) != 0) { 188 if (!Nflag || errno != ENOENT) { 189 warn("%s", path2); 190 return; 191 } 192 flags |= D_EMPTY2; 193 memset(&stb2, 0, sizeof(stb2)); 194 stb2.st_mode = stb1.st_mode; 195 } 196 if (stb1.st_mode == 0) 197 stb1.st_mode = stb2.st_mode; 198 199 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 200 if (rflag) 201 diffdir(path1, path2, flags); 202 else 203 printf("Common subdirectories: %s and %s\n", 204 path1, path2); 205 return; 206 } 207 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 208 dp->d_status = D_SKIPPED1; 209 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 210 dp->d_status = D_SKIPPED2; 211 else 212 dp->d_status = diffreg(path1, path2, flags, 0); 213 print_status(dp->d_status, path1, path2, ""); 214 } 215 216 /* 217 * Returns 1 if the directory entry should be included in the 218 * diff, else 0. Checks the excludes list. 219 */ 220 static int 221 selectfile(const struct dirent *dp) 222 { 223 struct excludes *excl; 224 225 if (dp->d_fileno == 0) 226 return (0); 227 228 /* always skip "." and ".." */ 229 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 230 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 231 return (0); 232 233 /* check excludes list */ 234 for (excl = excludes_list; excl != NULL; excl = excl->next) 235 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 236 return (0); 237 238 return (1); 239 } 240