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/stat.h> 24 25 #include <dirent.h> 26 #include <err.h> 27 #include <errno.h> 28 #include <fcntl.h> 29 #include <fnmatch.h> 30 #include <paths.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 #include <limits.h> 36 37 #include "diff.h" 38 #include "xmalloc.h" 39 40 static int selectfile(const struct dirent *); 41 static void diffit(struct dirent *, char *, size_t, char *, size_t, int); 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 dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); 58 if (dirlen1 >= sizeof(path1) - 1) { 59 warnc(ENAMETOOLONG, "%s", p1); 60 status = 2; 61 return; 62 } 63 if (path1[dirlen1 - 1] != '/') { 64 path1[dirlen1++] = '/'; 65 path1[dirlen1] = '\0'; 66 } 67 dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); 68 if (dirlen2 >= sizeof(path2) - 1) { 69 warnc(ENAMETOOLONG, "%s", p2); 70 status = 2; 71 return; 72 } 73 if (path2[dirlen2 - 1] != '/') { 74 path2[dirlen2++] = '/'; 75 path2[dirlen2] = '\0'; 76 } 77 78 /* 79 * Get a list of entries in each directory, skipping "excluded" files 80 * and sorting alphabetically. 81 */ 82 pos = scandir(path1, &dirp1, selectfile, alphasort); 83 if (pos == -1) { 84 if (errno == ENOENT && (Nflag || Pflag)) { 85 pos = 0; 86 } else { 87 warn("%s", path1); 88 goto closem; 89 } 90 } 91 dp1 = dirp1; 92 edp1 = dirp1 + pos; 93 94 pos = scandir(path2, &dirp2, selectfile, alphasort); 95 if (pos == -1) { 96 if (errno == ENOENT && Nflag) { 97 pos = 0; 98 } else { 99 warn("%s", path2); 100 goto closem; 101 } 102 } 103 dp2 = dirp2; 104 edp2 = dirp2 + pos; 105 106 /* 107 * If we were given a starting point, find it. 108 */ 109 if (start != NULL) { 110 while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) 111 dp1++; 112 while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) 113 dp2++; 114 } 115 116 /* 117 * Iterate through the two directory lists, diffing as we go. 118 */ 119 while (dp1 != edp1 || dp2 != edp2) { 120 dent1 = dp1 != edp1 ? *dp1 : NULL; 121 dent2 = dp2 != edp2 ? *dp2 : NULL; 122 123 pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : 124 strcmp(dent1->d_name, dent2->d_name); 125 if (pos == 0) { 126 /* file exists in both dirs, diff it */ 127 diffit(dent1, path1, dirlen1, path2, dirlen2, flags); 128 dp1++; 129 dp2++; 130 } else if (pos < 0) { 131 /* file only in first dir, only diff if -N */ 132 if (Nflag) 133 diffit(dent1, path1, dirlen1, path2, dirlen2, 134 flags); 135 else 136 print_only(path1, dirlen1, dent1->d_name); 137 dp1++; 138 } else { 139 /* file only in second dir, only diff if -N or -P */ 140 if (Nflag || Pflag) 141 diffit(dent2, path1, dirlen1, path2, dirlen2, 142 flags); 143 else 144 print_only(path2, dirlen2, dent2->d_name); 145 dp2++; 146 } 147 } 148 149 closem: 150 if (dirp1 != NULL) { 151 for (dp1 = dirp1; dp1 < edp1; dp1++) 152 free(*dp1); 153 free(dirp1); 154 } 155 if (dirp2 != NULL) { 156 for (dp2 = dirp2; dp2 < edp2; dp2++) 157 free(*dp2); 158 free(dirp2); 159 } 160 } 161 162 /* 163 * Do the actual diff by calling either diffreg() or diffdir(). 164 */ 165 static void 166 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2, 167 int flags) 168 { 169 flags |= D_HEADER; 170 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 171 if (stat(path1, &stb1) != 0) { 172 if (!(Nflag || Pflag) || errno != ENOENT) { 173 warn("%s", path1); 174 return; 175 } 176 flags |= D_EMPTY1; 177 memset(&stb1, 0, sizeof(stb1)); 178 } 179 180 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 181 if (stat(path2, &stb2) != 0) { 182 if (!Nflag || errno != ENOENT) { 183 warn("%s", path2); 184 return; 185 } 186 flags |= D_EMPTY2; 187 memset(&stb2, 0, sizeof(stb2)); 188 stb2.st_mode = stb1.st_mode; 189 } 190 if (stb1.st_mode == 0) 191 stb1.st_mode = stb2.st_mode; 192 193 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 194 if (rflag) 195 diffdir(path1, path2, flags); 196 else 197 printf("Common subdirectories: %s and %s\n", 198 path1, path2); 199 return; 200 } 201 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 202 dp->d_status = D_SKIPPED1; 203 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 204 dp->d_status = D_SKIPPED2; 205 else 206 dp->d_status = diffreg(path1, path2, flags); 207 print_status(dp->d_status, path1, path2, ""); 208 } 209 210 /* 211 * Returns 1 if the directory entry should be included in the 212 * diff, else 0. Checks the excludes list. 213 */ 214 static int 215 selectfile(const struct dirent *dp) 216 { 217 struct excludes *excl; 218 219 if (dp->d_fileno == 0) 220 return (0); 221 222 /* always skip "." and ".." */ 223 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 224 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 225 return (0); 226 227 /* check excludes list */ 228 for (excl = excludes_list; excl != NULL; excl = excl->next) 229 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 230 return (0); 231 232 return (1); 233 } 234