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 37 #include "diff.h" 38 39 static int selectfile(const struct dirent *); 40 static void diffit(struct dirent *, char *, size_t, char *, size_t, int); 41 42 #define d_status d_type /* we need to store status for -l */ 43 44 /* 45 * Diff directory traversal. Will be called recursively if -r was specified. 46 */ 47 void 48 diffdir(char *p1, char *p2, int flags) 49 { 50 struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; 51 struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; 52 size_t dirlen1, dirlen2; 53 char path1[PATH_MAX], path2[PATH_MAX]; 54 int pos; 55 56 edp1 = edp2 = NULL; 57 58 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 59 if (dirlen1 >= sizeof(path1) - 1) { 60 warnc(ENAMETOOLONG, "%s", p1); 61 status |= 2; 62 return; 63 } 64 if (path1[dirlen1 - 1] != '/') { 65 path1[dirlen1++] = '/'; 66 path1[dirlen1] = '\0'; 67 } 68 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 69 if (dirlen2 >= sizeof(path2) - 1) { 70 warnc(ENAMETOOLONG, "%s", p2); 71 status |= 2; 72 return; 73 } 74 if (path2[dirlen2 - 1] != '/') { 75 path2[dirlen2++] = '/'; 76 path2[dirlen2] = '\0'; 77 } 78 79 /* 80 * Get a list of entries in each directory, skipping "excluded" files 81 * and sorting alphabetically. 82 */ 83 pos = scandir(path1, &dirp1, selectfile, alphasort); 84 if (pos == -1) { 85 if (errno == ENOENT && (Nflag || Pflag)) { 86 pos = 0; 87 } else { 88 warn("%s", path1); 89 goto closem; 90 } 91 } 92 dp1 = dirp1; 93 edp1 = dirp1 + pos; 94 95 pos = scandir(path2, &dirp2, selectfile, alphasort); 96 if (pos == -1) { 97 if (errno == ENOENT && Nflag) { 98 pos = 0; 99 } else { 100 warn("%s", path2); 101 goto closem; 102 } 103 } 104 dp2 = dirp2; 105 edp2 = dirp2 + pos; 106 107 /* 108 * If we were given a starting point, find it. 109 */ 110 if (start != NULL) { 111 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 112 dp1++; 113 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 114 dp2++; 115 } 116 117 /* 118 * Iterate through the two directory lists, diffing as we go. 119 */ 120 while (dp1 != edp1 || dp2 != edp2) { 121 dent1 = dp1 != edp1 ? *dp1 : NULL; 122 dent2 = dp2 != edp2 ? *dp2 : NULL; 123 124 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 125 ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) : 126 strcmp(dent1->d_name, dent2->d_name) ; 127 if (pos == 0) { 128 /* file exists in both dirs, diff it */ 129 diffit(dent1, path1, dirlen1, path2, dirlen2, flags); 130 dp1++; 131 dp2++; 132 } else if (pos < 0) { 133 /* file only in first dir, only diff if -N */ 134 if (Nflag) { 135 diffit(dent1, path1, dirlen1, path2, dirlen2, 136 flags); 137 } else { 138 print_only(path1, dirlen1, dent1->d_name); 139 status |= 1; 140 } 141 dp1++; 142 } else { 143 /* file only in second dir, only diff if -N or -P */ 144 if (Nflag || Pflag) 145 diffit(dent2, path1, dirlen1, path2, dirlen2, 146 flags); 147 else { 148 print_only(path2, dirlen2, dent2->d_name); 149 status |= 1; 150 } 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