1 /* $OpenBSD: diffdir.c,v 1.47 2019/01/25 00:19:26 millert Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2010 Todd C. Miller <millert@openbsd.org> 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 diffdir(char * p1,char * p2,int flags)49 diffdir(char *p1, char *p2, int flags) 50 { 51 struct dirent *dent1, **dp1, **edp1 = NULL, **dirp1 = NULL; 52 struct dirent *dent2, **dp2, **edp2 = NULL, **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 status |= 1; 138 } 139 dp1++; 140 } else { 141 /* file only in second dir, only diff if -N or -P */ 142 if (Nflag || Pflag) { 143 diffit(dent2, path1, dirlen1, path2, dirlen2, 144 flags); 145 } else { 146 print_only(path2, dirlen2, dent2->d_name); 147 status |= 1; 148 } 149 dp2++; 150 } 151 } 152 153 closem: 154 if (dirp1 != NULL) { 155 for (dp1 = dirp1; dp1 < edp1; dp1++) 156 free(*dp1); 157 free(dirp1); 158 } 159 if (dirp2 != NULL) { 160 for (dp2 = dirp2; dp2 < edp2; dp2++) 161 free(*dp2); 162 free(dirp2); 163 } 164 } 165 166 /* 167 * Do the actual diff by calling either diffreg() or diffdir(). 168 */ 169 static void diffit(struct dirent * dp,char * path1,size_t plen1,char * path2,size_t plen2,int flags)170 diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2, 171 int flags) 172 { 173 flags |= D_HEADER; 174 strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); 175 if (stat(path1, &stb1) != 0) { 176 if (!(Nflag || Pflag) || errno != ENOENT) { 177 warn("%s", path1); 178 return; 179 } 180 flags |= D_EMPTY1; 181 memset(&stb1, 0, sizeof(stb1)); 182 } 183 184 strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); 185 if (stat(path2, &stb2) != 0) { 186 if (!Nflag || errno != ENOENT) { 187 warn("%s", path2); 188 return; 189 } 190 flags |= D_EMPTY2; 191 memset(&stb2, 0, sizeof(stb2)); 192 stb2.st_mode = stb1.st_mode; 193 } 194 if (stb1.st_mode == 0) 195 stb1.st_mode = stb2.st_mode; 196 197 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 198 if (rflag) 199 diffdir(path1, path2, flags); 200 else 201 printf("Common subdirectories: %s and %s\n", 202 path1, path2); 203 return; 204 } 205 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) 206 dp->d_status = D_SKIPPED1; 207 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) 208 dp->d_status = D_SKIPPED2; 209 else 210 dp->d_status = diffreg(path1, path2, flags); 211 print_status(dp->d_status, path1, path2, ""); 212 } 213 214 /* 215 * Returns 1 if the directory entry should be included in the 216 * diff, else 0. Checks the excludes list. 217 */ 218 static int selectfile(const struct dirent * dp)219 selectfile(const struct dirent *dp) 220 { 221 struct excludes *excl; 222 223 if (dp->d_fileno == 0) 224 return (0); 225 226 /* always skip "." and ".." */ 227 if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || 228 (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) 229 return (0); 230 231 /* check excludes list */ 232 for (excl = excludes_list; excl != NULL; excl = excl->next) 233 if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) 234 return (0); 235 236 return (1); 237 } 238