| 1 | /* |
| 2 | * Syscall wrappers to ensure that nothing gets done in dry_run mode |
| 3 | * and to handle system peculiarities. |
| 4 | * |
| 5 | * Copyright (C) 1998 Andrew Tridgell |
| 6 | * Copyright (C) 2002 Martin Pool |
| 7 | * Copyright (C) 2003-2007 Wayne Davison |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 3 as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, visit the http://fsf.org website. |
| 20 | */ |
| 21 | |
| 22 | #include "rsync.h" |
| 23 | |
| 24 | #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H |
| 25 | #include <sys/un.h> |
| 26 | #endif |
| 27 | |
| 28 | extern int dry_run; |
| 29 | extern int am_root; |
| 30 | extern int read_only; |
| 31 | extern int list_only; |
| 32 | extern int preserve_perms; |
| 33 | |
| 34 | #define RETURN_ERROR_IF(x,e) \ |
| 35 | do { \ |
| 36 | if (x) { \ |
| 37 | errno = (e); \ |
| 38 | return -1; \ |
| 39 | } \ |
| 40 | } while (0) |
| 41 | |
| 42 | #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS) |
| 43 | |
| 44 | int do_unlink(const char *fname) |
| 45 | { |
| 46 | if (dry_run) return 0; |
| 47 | RETURN_ERROR_IF_RO_OR_LO; |
| 48 | return unlink(fname); |
| 49 | } |
| 50 | |
| 51 | int do_symlink(const char *fname1, const char *fname2) |
| 52 | { |
| 53 | if (dry_run) return 0; |
| 54 | RETURN_ERROR_IF_RO_OR_LO; |
| 55 | return symlink(fname1, fname2); |
| 56 | } |
| 57 | |
| 58 | #ifdef HAVE_LINK |
| 59 | int do_link(const char *fname1, const char *fname2) |
| 60 | { |
| 61 | if (dry_run) return 0; |
| 62 | RETURN_ERROR_IF_RO_OR_LO; |
| 63 | return link(fname1, fname2); |
| 64 | } |
| 65 | #endif |
| 66 | |
| 67 | int do_lchown(const char *path, uid_t owner, gid_t group) |
| 68 | { |
| 69 | if (dry_run) return 0; |
| 70 | RETURN_ERROR_IF_RO_OR_LO; |
| 71 | #ifndef HAVE_LCHOWN |
| 72 | #define lchown chown |
| 73 | #endif |
| 74 | return lchown(path, owner, group); |
| 75 | } |
| 76 | |
| 77 | int do_mknod(const char *pathname, mode_t mode, dev_t dev) |
| 78 | { |
| 79 | if (dry_run) return 0; |
| 80 | RETURN_ERROR_IF_RO_OR_LO; |
| 81 | |
| 82 | /* For --fake-super, we create a normal file with mode 0600. */ |
| 83 | if (am_root < 0) { |
| 84 | int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR); |
| 85 | if (fd < 0 || close(fd) < 0) |
| 86 | return -1; |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO |
| 91 | if (S_ISFIFO(mode)) |
| 92 | return mkfifo(pathname, mode); |
| 93 | #endif |
| 94 | #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H |
| 95 | if (S_ISSOCK(mode)) { |
| 96 | int sock; |
| 97 | struct sockaddr_un saddr; |
| 98 | #ifdef HAVE_SOCKADDR_UN_LEN |
| 99 | unsigned int len = |
| 100 | #endif |
| 101 | strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path); |
| 102 | #ifdef HAVE_SOCKADDR_UN_LEN |
| 103 | saddr.sun_len = len >= sizeof saddr.sun_path |
| 104 | ? sizeof saddr.sun_path : len + 1; |
| 105 | #endif |
| 106 | saddr.sun_family = AF_UNIX; |
| 107 | |
| 108 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0 |
| 109 | || (unlink(pathname) < 0 && errno != ENOENT) |
| 110 | || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0) |
| 111 | return -1; |
| 112 | close(sock); |
| 113 | #ifdef HAVE_CHMOD |
| 114 | return do_chmod(pathname, mode); |
| 115 | #else |
| 116 | return 0; |
| 117 | #endif |
| 118 | } |
| 119 | #endif |
| 120 | #ifdef HAVE_MKNOD |
| 121 | return mknod(pathname, mode, dev); |
| 122 | #else |
| 123 | return -1; |
| 124 | #endif |
| 125 | } |
| 126 | |
| 127 | int do_rmdir(const char *pathname) |
| 128 | { |
| 129 | if (dry_run) return 0; |
| 130 | RETURN_ERROR_IF_RO_OR_LO; |
| 131 | return rmdir(pathname); |
| 132 | } |
| 133 | |
| 134 | int do_open(const char *pathname, int flags, mode_t mode) |
| 135 | { |
| 136 | if (flags != O_RDONLY) { |
| 137 | RETURN_ERROR_IF(dry_run, 0); |
| 138 | RETURN_ERROR_IF_RO_OR_LO; |
| 139 | } |
| 140 | |
| 141 | return open(pathname, flags | O_BINARY, mode); |
| 142 | } |
| 143 | |
| 144 | #ifdef HAVE_CHMOD |
| 145 | int do_chmod(const char *path, mode_t mode) |
| 146 | { |
| 147 | int code; |
| 148 | if (dry_run) return 0; |
| 149 | RETURN_ERROR_IF_RO_OR_LO; |
| 150 | if (S_ISLNK(mode)) { |
| 151 | #ifdef HAVE_LCHMOD |
| 152 | code = lchmod(path, mode & CHMOD_BITS); |
| 153 | #else |
| 154 | code = 1; |
| 155 | #endif |
| 156 | } else |
| 157 | code = chmod(path, mode & CHMOD_BITS); |
| 158 | if (code != 0 && preserve_perms) |
| 159 | return code; |
| 160 | return 0; |
| 161 | } |
| 162 | #endif |
| 163 | |
| 164 | int do_rename(const char *fname1, const char *fname2) |
| 165 | { |
| 166 | if (dry_run) return 0; |
| 167 | RETURN_ERROR_IF_RO_OR_LO; |
| 168 | return rename(fname1, fname2); |
| 169 | } |
| 170 | |
| 171 | void trim_trailing_slashes(char *name) |
| 172 | { |
| 173 | int l; |
| 174 | /* Some BSD systems cannot make a directory if the name |
| 175 | * contains a trailing slash. |
| 176 | * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */ |
| 177 | |
| 178 | /* Don't change empty string; and also we can't improve on |
| 179 | * "/" */ |
| 180 | |
| 181 | l = strlen(name); |
| 182 | while (l > 1) { |
| 183 | if (name[--l] != '/') |
| 184 | break; |
| 185 | name[l] = '\0'; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | int do_mkdir(char *fname, mode_t mode) |
| 190 | { |
| 191 | if (dry_run) return 0; |
| 192 | RETURN_ERROR_IF_RO_OR_LO; |
| 193 | trim_trailing_slashes(fname); |
| 194 | return mkdir(fname, mode); |
| 195 | } |
| 196 | |
| 197 | /* like mkstemp but forces permissions */ |
| 198 | int do_mkstemp(char *template, mode_t perms) |
| 199 | { |
| 200 | RETURN_ERROR_IF(dry_run, 0); |
| 201 | RETURN_ERROR_IF(read_only, EROFS); |
| 202 | |
| 203 | #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64) |
| 204 | { |
| 205 | int fd = mkstemp(template); |
| 206 | if (fd == -1) |
| 207 | return -1; |
| 208 | if (fchmod(fd, perms) != 0 && preserve_perms) { |
| 209 | int errno_save = errno; |
| 210 | close(fd); |
| 211 | unlink(template); |
| 212 | errno = errno_save; |
| 213 | return -1; |
| 214 | } |
| 215 | #if defined HAVE_SETMODE && O_BINARY |
| 216 | setmode(fd, O_BINARY); |
| 217 | #endif |
| 218 | return fd; |
| 219 | } |
| 220 | #else |
| 221 | if (!mktemp(template)) |
| 222 | return -1; |
| 223 | return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms); |
| 224 | #endif |
| 225 | } |
| 226 | |
| 227 | int do_stat(const char *fname, STRUCT_STAT *st) |
| 228 | { |
| 229 | #ifdef USE_STAT64_FUNCS |
| 230 | return stat64(fname, st); |
| 231 | #else |
| 232 | return stat(fname, st); |
| 233 | #endif |
| 234 | } |
| 235 | |
| 236 | int do_lstat(const char *fname, STRUCT_STAT *st) |
| 237 | { |
| 238 | #ifdef SUPPORT_LINKS |
| 239 | # ifdef USE_STAT64_FUNCS |
| 240 | return lstat64(fname, st); |
| 241 | # else |
| 242 | return lstat(fname, st); |
| 243 | # endif |
| 244 | #else |
| 245 | return do_stat(fname, st); |
| 246 | #endif |
| 247 | } |
| 248 | |
| 249 | int do_fstat(int fd, STRUCT_STAT *st) |
| 250 | { |
| 251 | #ifdef USE_STAT64_FUNCS |
| 252 | return fstat64(fd, st); |
| 253 | #else |
| 254 | return fstat(fd, st); |
| 255 | #endif |
| 256 | } |
| 257 | |
| 258 | OFF_T do_lseek(int fd, OFF_T offset, int whence) |
| 259 | { |
| 260 | #ifdef HAVE_LSEEK64 |
| 261 | #if !SIZEOF_OFF64_T |
| 262 | OFF_T lseek64(); |
| 263 | #else |
| 264 | off64_t lseek64(); |
| 265 | #endif |
| 266 | return lseek64(fd, offset, whence); |
| 267 | #else |
| 268 | return lseek(fd, offset, whence); |
| 269 | #endif |
| 270 | } |
| 271 | |
| 272 | char *d_name(struct dirent *di) |
| 273 | { |
| 274 | #ifdef HAVE_BROKEN_READDIR |
| 275 | return (di->d_name - 2); |
| 276 | #else |
| 277 | return di->d_name; |
| 278 | #endif |
| 279 | } |