Annotation of embedaddon/rsync/syscall.c, revision 1.1
1.1 ! misho 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) 2003-2009 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 as published by
! 11: * the Free Software Foundation; either version 3 of the License, or
! 12: * (at your option) any later version.
! 13: *
! 14: * This program is distributed in the hope that it will be useful,
! 15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
! 16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 17: * GNU General Public License for more details.
! 18: *
! 19: * You should have received a copy of the GNU General Public License along
! 20: * with this program; if not, visit the http://fsf.org website.
! 21: */
! 22:
! 23: #include "rsync.h"
! 24:
! 25: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
! 26: #include <sys/un.h>
! 27: #endif
! 28: #ifdef HAVE_SYS_ATTR_H
! 29: #include <sys/attr.h>
! 30: #endif
! 31:
! 32: extern int dry_run;
! 33: extern int am_root;
! 34: extern int read_only;
! 35: extern int list_only;
! 36: extern int preserve_perms;
! 37: extern int preserve_executability;
! 38:
! 39: #define RETURN_ERROR_IF(x,e) \
! 40: do { \
! 41: if (x) { \
! 42: errno = (e); \
! 43: return -1; \
! 44: } \
! 45: } while (0)
! 46:
! 47: #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
! 48:
! 49: int do_unlink(const char *fname)
! 50: {
! 51: if (dry_run) return 0;
! 52: RETURN_ERROR_IF_RO_OR_LO;
! 53: return unlink(fname);
! 54: }
! 55:
! 56: int do_symlink(const char *fname1, const char *fname2)
! 57: {
! 58: if (dry_run) return 0;
! 59: RETURN_ERROR_IF_RO_OR_LO;
! 60: return symlink(fname1, fname2);
! 61: }
! 62:
! 63: #ifdef HAVE_LINK
! 64: int do_link(const char *fname1, const char *fname2)
! 65: {
! 66: if (dry_run) return 0;
! 67: RETURN_ERROR_IF_RO_OR_LO;
! 68: return link(fname1, fname2);
! 69: }
! 70: #endif
! 71:
! 72: int do_lchown(const char *path, uid_t owner, gid_t group)
! 73: {
! 74: if (dry_run) return 0;
! 75: RETURN_ERROR_IF_RO_OR_LO;
! 76: #ifndef HAVE_LCHOWN
! 77: #define lchown chown
! 78: #endif
! 79: return lchown(path, owner, group);
! 80: }
! 81:
! 82: int do_mknod(const char *pathname, mode_t mode, dev_t dev)
! 83: {
! 84: if (dry_run) return 0;
! 85: RETURN_ERROR_IF_RO_OR_LO;
! 86:
! 87: /* For --fake-super, we create a normal file with mode 0600. */
! 88: if (am_root < 0) {
! 89: int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
! 90: if (fd < 0 || close(fd) < 0)
! 91: return -1;
! 92: return 0;
! 93: }
! 94:
! 95: #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
! 96: if (S_ISFIFO(mode))
! 97: return mkfifo(pathname, mode);
! 98: #endif
! 99: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
! 100: if (S_ISSOCK(mode)) {
! 101: int sock;
! 102: struct sockaddr_un saddr;
! 103: #ifdef HAVE_SOCKADDR_UN_LEN
! 104: unsigned int len =
! 105: #endif
! 106: strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
! 107: #ifdef HAVE_SOCKADDR_UN_LEN
! 108: saddr.sun_len = len >= sizeof saddr.sun_path
! 109: ? sizeof saddr.sun_path : len + 1;
! 110: #endif
! 111: saddr.sun_family = AF_UNIX;
! 112:
! 113: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
! 114: || (unlink(pathname) < 0 && errno != ENOENT)
! 115: || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
! 116: return -1;
! 117: close(sock);
! 118: #ifdef HAVE_CHMOD
! 119: return do_chmod(pathname, mode);
! 120: #else
! 121: return 0;
! 122: #endif
! 123: }
! 124: #endif
! 125: #ifdef HAVE_MKNOD
! 126: return mknod(pathname, mode, dev);
! 127: #else
! 128: return -1;
! 129: #endif
! 130: }
! 131:
! 132: int do_rmdir(const char *pathname)
! 133: {
! 134: if (dry_run) return 0;
! 135: RETURN_ERROR_IF_RO_OR_LO;
! 136: return rmdir(pathname);
! 137: }
! 138:
! 139: int do_open(const char *pathname, int flags, mode_t mode)
! 140: {
! 141: if (flags != O_RDONLY) {
! 142: RETURN_ERROR_IF(dry_run, 0);
! 143: RETURN_ERROR_IF_RO_OR_LO;
! 144: }
! 145:
! 146: return open(pathname, flags | O_BINARY, mode);
! 147: }
! 148:
! 149: #ifdef HAVE_CHMOD
! 150: int do_chmod(const char *path, mode_t mode)
! 151: {
! 152: int code;
! 153: if (dry_run) return 0;
! 154: RETURN_ERROR_IF_RO_OR_LO;
! 155: #ifdef HAVE_LCHMOD
! 156: code = lchmod(path, mode & CHMOD_BITS);
! 157: #else
! 158: if (S_ISLNK(mode)) {
! 159: # if defined HAVE_SETATTRLIST
! 160: struct attrlist attrList;
! 161: uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
! 162:
! 163: memset(&attrList, 0, sizeof attrList);
! 164: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
! 165: attrList.commonattr = ATTR_CMN_ACCESSMASK;
! 166: code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
! 167: # else
! 168: code = 1;
! 169: # endif
! 170: } else
! 171: code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
! 172: #endif /* !HAVE_LCHMOD */
! 173: if (code != 0 && (preserve_perms || preserve_executability))
! 174: return code;
! 175: return 0;
! 176: }
! 177: #endif
! 178:
! 179: int do_rename(const char *fname1, const char *fname2)
! 180: {
! 181: if (dry_run) return 0;
! 182: RETURN_ERROR_IF_RO_OR_LO;
! 183: return rename(fname1, fname2);
! 184: }
! 185:
! 186: #ifdef HAVE_FTRUNCATE
! 187: int do_ftruncate(int fd, OFF_T size)
! 188: {
! 189: int ret;
! 190:
! 191: if (dry_run) return 0;
! 192: RETURN_ERROR_IF_RO_OR_LO;
! 193:
! 194: do {
! 195: ret = ftruncate(fd, size);
! 196: } while (ret < 0 && errno == EINTR);
! 197:
! 198: return ret;
! 199: }
! 200: #endif
! 201:
! 202: void trim_trailing_slashes(char *name)
! 203: {
! 204: int l;
! 205: /* Some BSD systems cannot make a directory if the name
! 206: * contains a trailing slash.
! 207: * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
! 208:
! 209: /* Don't change empty string; and also we can't improve on
! 210: * "/" */
! 211:
! 212: l = strlen(name);
! 213: while (l > 1) {
! 214: if (name[--l] != '/')
! 215: break;
! 216: name[l] = '\0';
! 217: }
! 218: }
! 219:
! 220: int do_mkdir(char *fname, mode_t mode)
! 221: {
! 222: if (dry_run) return 0;
! 223: RETURN_ERROR_IF_RO_OR_LO;
! 224: trim_trailing_slashes(fname);
! 225: return mkdir(fname, mode);
! 226: }
! 227:
! 228: /* like mkstemp but forces permissions */
! 229: int do_mkstemp(char *template, mode_t perms)
! 230: {
! 231: RETURN_ERROR_IF(dry_run, 0);
! 232: RETURN_ERROR_IF(read_only, EROFS);
! 233: perms |= S_IWUSR;
! 234:
! 235: #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
! 236: {
! 237: int fd = mkstemp(template);
! 238: if (fd == -1)
! 239: return -1;
! 240: if (fchmod(fd, perms) != 0 && preserve_perms) {
! 241: int errno_save = errno;
! 242: close(fd);
! 243: unlink(template);
! 244: errno = errno_save;
! 245: return -1;
! 246: }
! 247: #if defined HAVE_SETMODE && O_BINARY
! 248: setmode(fd, O_BINARY);
! 249: #endif
! 250: return fd;
! 251: }
! 252: #else
! 253: if (!mktemp(template))
! 254: return -1;
! 255: return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
! 256: #endif
! 257: }
! 258:
! 259: int do_stat(const char *fname, STRUCT_STAT *st)
! 260: {
! 261: #ifdef USE_STAT64_FUNCS
! 262: return stat64(fname, st);
! 263: #else
! 264: return stat(fname, st);
! 265: #endif
! 266: }
! 267:
! 268: int do_lstat(const char *fname, STRUCT_STAT *st)
! 269: {
! 270: #ifdef SUPPORT_LINKS
! 271: # ifdef USE_STAT64_FUNCS
! 272: return lstat64(fname, st);
! 273: # else
! 274: return lstat(fname, st);
! 275: # endif
! 276: #else
! 277: return do_stat(fname, st);
! 278: #endif
! 279: }
! 280:
! 281: int do_fstat(int fd, STRUCT_STAT *st)
! 282: {
! 283: #ifdef USE_STAT64_FUNCS
! 284: return fstat64(fd, st);
! 285: #else
! 286: return fstat(fd, st);
! 287: #endif
! 288: }
! 289:
! 290: OFF_T do_lseek(int fd, OFF_T offset, int whence)
! 291: {
! 292: #ifdef HAVE_LSEEK64
! 293: #if !SIZEOF_OFF64_T
! 294: OFF_T lseek64();
! 295: #else
! 296: off64_t lseek64();
! 297: #endif
! 298: return lseek64(fd, offset, whence);
! 299: #else
! 300: return lseek(fd, offset, whence);
! 301: #endif
! 302: }
! 303:
! 304: #ifdef HAVE_UTIMENSAT
! 305: int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec)
! 306: {
! 307: struct timespec t[2];
! 308:
! 309: if (dry_run) return 0;
! 310: RETURN_ERROR_IF_RO_OR_LO;
! 311:
! 312: t[0].tv_sec = 0;
! 313: t[0].tv_nsec = UTIME_NOW;
! 314: t[1].tv_sec = modtime;
! 315: t[1].tv_nsec = mod_nsec;
! 316: return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
! 317: }
! 318: #endif
! 319:
! 320: #ifdef HAVE_LUTIMES
! 321: int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec)
! 322: {
! 323: struct timeval t[2];
! 324:
! 325: if (dry_run) return 0;
! 326: RETURN_ERROR_IF_RO_OR_LO;
! 327:
! 328: t[0].tv_sec = time(NULL);
! 329: t[0].tv_usec = 0;
! 330: t[1].tv_sec = modtime;
! 331: t[1].tv_usec = mod_nsec / 1000;
! 332: return lutimes(fname, t);
! 333: }
! 334: #endif
! 335:
! 336: #ifdef HAVE_UTIMES
! 337: int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec)
! 338: {
! 339: struct timeval t[2];
! 340:
! 341: if (dry_run) return 0;
! 342: RETURN_ERROR_IF_RO_OR_LO;
! 343:
! 344: t[0].tv_sec = time(NULL);
! 345: t[0].tv_usec = 0;
! 346: t[1].tv_sec = modtime;
! 347: t[1].tv_usec = mod_nsec / 1000;
! 348: return utimes(fname, t);
! 349: }
! 350:
! 351: #elif defined HAVE_UTIME
! 352: int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec))
! 353: {
! 354: #ifdef HAVE_STRUCT_UTIMBUF
! 355: struct utimbuf tbuf;
! 356: #else
! 357: time_t t[2];
! 358: #endif
! 359:
! 360: if (dry_run) return 0;
! 361: RETURN_ERROR_IF_RO_OR_LO;
! 362:
! 363: # ifdef HAVE_STRUCT_UTIMBUF
! 364: tbuf.actime = time(NULL);
! 365: tbuf.modtime = modtime;
! 366: return utime(fname, &tbuf);
! 367: # else
! 368: t[0] = time(NULL);
! 369: t[1] = modtime;
! 370: return utime(fname, t);
! 371: # endif
! 372: }
! 373:
! 374: #else
! 375: #error Need utimes or utime function.
! 376: #endif
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