896 lines
15 KiB
C
896 lines
15 KiB
C
/*
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** Copyright 1998-2003 University of Illinois Board of Trustees
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** Copyright 1998-2003 Mark D. Roth
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** All rights reserved.
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**
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** extract.c - libtar code to extract a file from a tar archive
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**
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** Mark D. Roth <roth@uiuc.edu>
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** Campus Information Technologies and Educational Services
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** University of Illinois at Urbana-Champaign
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*/
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#include <libtarint/internal.h>
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#include <stdio.h>
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#include <libtar/compat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <errno.h>
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#if defined(_WIN32) && !defined(__CYGWIN__)
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# ifdef _MSC_VER
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# include <sys/utime.h>
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# else
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# include <utime.h>
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# endif
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# include <io.h>
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# include <direct.h>
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#else
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# include <utime.h>
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# include <sys/param.h>
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_MKDEV_H
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# include <sys/mkdev.h>
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#endif
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struct linkname
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{
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char ln_save[TAR_MAXPATHLEN];
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char ln_real[TAR_MAXPATHLEN];
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};
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typedef struct linkname linkname_t;
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static int
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tar_set_file_perms(TAR *t, char *realname)
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{
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mode_t mode;
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uid_t uid;
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gid_t gid;
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struct utimbuf ut;
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char *filename;
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char *pathname = 0;
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if (realname)
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{
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filename = realname;
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}
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else
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{
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pathname = th_get_pathname(t);
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filename = pathname;
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}
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mode = th_get_mode(t);
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uid = th_get_uid(t);
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gid = th_get_gid(t);
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ut.modtime = ut.actime = th_get_mtime(t);
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/* change owner/group */
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#ifndef WIN32
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if (geteuid() == 0)
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#ifdef HAVE_LCHOWN
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if (lchown(filename, uid, gid) == -1)
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{
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# ifdef DEBUG
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fprintf(stderr, "lchown(\"%s\", %d, %d): %s\n",
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filename, uid, gid, strerror(errno));
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# endif
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#else /* ! HAVE_LCHOWN */
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if (!TH_ISSYM(t) && chown(filename, uid, gid) == -1)
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{
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# ifdef DEBUG
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fprintf(stderr, "chown(\"%s\", %d, %d): %s\n",
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filename, uid, gid, strerror(errno));
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# endif
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#endif /* HAVE_LCHOWN */
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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/* change access/modification time */
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if (!TH_ISSYM(t) && utime(filename, &ut) == -1)
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{
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#ifdef DEBUG
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perror("utime()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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/* change permissions */
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if (!TH_ISSYM(t) && chmod(filename, mode & 07777) == -1)
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{
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#ifdef DEBUG
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perror("chmod()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#else /* WIN32 */
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(void)filename;
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(void)gid;
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(void)uid;
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(void)mode;
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#endif /* WIN32 */
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if (pathname)
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{
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free(pathname);
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}
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return 0;
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}
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/* switchboard */
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int
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tar_extract_file(TAR *t, char *realname)
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{
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int i;
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linkname_t *lnp;
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char *pathname;
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if (t->options & TAR_NOOVERWRITE)
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{
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struct stat s;
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#ifdef WIN32
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if (stat(realname, &s) == 0 || errno != ENOENT)
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#else
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if (lstat(realname, &s) == 0 || errno != ENOENT)
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#endif
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{
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errno = EEXIST;
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return -1;
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}
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}
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if (TH_ISDIR(t))
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{
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i = tar_extract_dir(t, realname);
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if (i == 1)
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i = 0;
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}
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#ifndef _WIN32
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else if (TH_ISLNK(t))
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i = tar_extract_hardlink(t, realname);
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else if (TH_ISSYM(t))
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i = tar_extract_symlink(t, realname);
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else if (TH_ISCHR(t))
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i = tar_extract_chardev(t, realname);
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else if (TH_ISBLK(t))
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i = tar_extract_blockdev(t, realname);
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else if (TH_ISFIFO(t))
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i = tar_extract_fifo(t, realname);
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#endif
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else /* if (TH_ISREG(t)) */
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i = tar_extract_regfile(t, realname);
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if (i != 0)
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return i;
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i = tar_set_file_perms(t, realname);
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if (i != 0)
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return i;
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lnp = (linkname_t *)calloc(1, sizeof(linkname_t));
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if (lnp == NULL)
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return -1;
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pathname = th_get_pathname(t);
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strlcpy(lnp->ln_save, pathname, sizeof(lnp->ln_save));
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strlcpy(lnp->ln_real, realname, sizeof(lnp->ln_real));
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#ifdef DEBUG
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printf("tar_extract_file(): calling libtar_hash_add(): key=\"%s\", "
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"value=\"%s\"\n", pathname, realname);
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#endif
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if (pathname)
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{
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free(pathname);
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}
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if (libtar_hash_add(t->h, lnp) != 0)
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return -1;
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return 0;
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}
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/* extract regular file */
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int
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tar_extract_regfile(TAR *t, char *realname)
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{
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mode_t mode;
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size_t size;
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uid_t uid;
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gid_t gid;
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int fdout;
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ssize_t i, k;
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char buf[T_BLOCKSIZE];
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char *filename;
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char *pathname = 0;
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#ifdef DEBUG
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printf("==> tar_extract_regfile(t=0x%lx, realname=\"%s\")\n", t,
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realname);
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#endif
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if (!TH_ISREG(t))
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{
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errno = EINVAL;
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return -1;
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}
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if (realname)
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{
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filename = realname;
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}
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else
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{
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pathname = th_get_pathname(t);
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filename = pathname;
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}
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mode = th_get_mode(t);
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size = th_get_size(t);
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uid = th_get_uid(t);
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gid = th_get_gid(t);
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/* Make a copy of the string because dirname and mkdirhier may modify the
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* string */
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strncpy(buf, filename, sizeof(buf)-1);
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buf[sizeof(buf)-1] = 0;
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if (mkdirhier(dirname(buf)) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifdef DEBUG
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printf(" ==> extracting: %s (mode %04o, uid %d, gid %d, %d bytes)\n",
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filename, mode, uid, gid, size);
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#endif
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fdout = open(filename, O_WRONLY | O_CREAT | O_TRUNC
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#ifdef O_BINARY
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| O_BINARY
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#endif
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, 0666);
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if (fdout == -1)
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{
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#ifdef DEBUG
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perror("open()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#if 0
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/* change the owner. (will only work if run as root) */
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if (fchown(fdout, uid, gid) == -1 && errno != EPERM)
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{
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#ifdef DEBUG
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perror("fchown()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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/* make sure the mode isn't inheritted from a file we're overwriting */
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if (fchmod(fdout, mode & 07777) == -1)
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{
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#ifdef DEBUG
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perror("fchmod()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#endif
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/* extract the file */
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for (i = size; i > 0; i -= T_BLOCKSIZE)
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{
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k = tar_block_read(t, buf);
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if (k != T_BLOCKSIZE)
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{
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if (k != -1)
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errno = EINVAL;
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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/* write block to output file */
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if (write(fdout, buf,
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((i > T_BLOCKSIZE) ? T_BLOCKSIZE : (unsigned int)i)) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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}
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/* close output file */
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if (close(fdout) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifdef DEBUG
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printf("### done extracting %s\n", filename);
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#endif
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(void)filename;
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(void)gid;
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(void)uid;
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(void)mode;
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if (pathname)
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{
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free(pathname);
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}
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return 0;
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}
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/* skip regfile */
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int
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tar_skip_regfile(TAR *t)
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{
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ssize_t i, k;
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size_t size;
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char buf[T_BLOCKSIZE];
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if (!TH_ISREG(t))
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{
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errno = EINVAL;
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return -1;
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}
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size = th_get_size(t);
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for (i = size; i > 0; i -= T_BLOCKSIZE)
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{
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k = tar_block_read(t, buf);
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if (k != T_BLOCKSIZE)
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{
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if (k != -1)
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errno = EINVAL;
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return -1;
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}
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}
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return 0;
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}
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/* hardlink */
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int
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tar_extract_hardlink(TAR * t, char *realname)
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{
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char *filename;
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char *linktgt;
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linkname_t *lnp;
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libtar_hashptr_t hp;
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char buf[T_BLOCKSIZE];
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char *pathname = 0;
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if (!TH_ISLNK(t))
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{
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errno = EINVAL;
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return -1;
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}
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if (realname)
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{
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filename = realname;
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}
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else
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{
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pathname = th_get_pathname(t);
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filename = pathname;
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}
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/* Make a copy of the string because dirname and mkdirhier may modify the
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* string */
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strncpy(buf, filename, sizeof(buf)-1);
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buf[sizeof(buf)-1] = 0;
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if (mkdirhier(dirname(buf)) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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libtar_hashptr_reset(&hp);
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if (libtar_hash_getkey(t->h, &hp, th_get_linkname(t),
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(libtar_matchfunc_t)libtar_str_match) != 0)
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{
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lnp = (linkname_t *)libtar_hashptr_data(&hp);
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linktgt = lnp->ln_real;
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}
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else
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linktgt = th_get_linkname(t);
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#ifdef DEBUG
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printf(" ==> extracting: %s (link to %s)\n", filename, linktgt);
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#endif
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#ifndef WIN32
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if (link(linktgt, filename) == -1)
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#else
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(void)linktgt;
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#endif
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{
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#ifdef DEBUG
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perror("link()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifndef WIN32
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if (pathname)
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{
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free(pathname);
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}
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return 0;
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#endif
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}
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/* symlink */
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int
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tar_extract_symlink(TAR *t, char *realname)
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{
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char *filename;
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char buf[T_BLOCKSIZE];
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char *pathname = 0;
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#ifndef _WIN32
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if (!TH_ISSYM(t))
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{
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errno = EINVAL;
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return -1;
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}
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#endif
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if (realname)
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{
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filename = realname;
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}
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else
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{
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pathname = th_get_pathname(t);
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filename = pathname;
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}
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/* Make a copy of the string because dirname and mkdirhier may modify the
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* string */
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strncpy(buf, filename, sizeof(buf)-1);
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buf[sizeof(buf)-1] = 0;
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if (mkdirhier(dirname(buf)) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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if (unlink(filename) == -1 && errno != ENOENT)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifdef DEBUG
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printf(" ==> extracting: %s (symlink to %s)\n",
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filename, th_get_linkname(t));
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#endif
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#ifndef WIN32
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if (symlink(th_get_linkname(t), filename) == -1)
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#endif
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{
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#ifdef DEBUG
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perror("symlink()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifndef WIN32
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if (pathname)
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{
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free(pathname);
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}
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return 0;
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#endif
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}
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/* character device */
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int
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tar_extract_chardev(TAR *t, char *realname)
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{
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mode_t mode;
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unsigned long devmaj, devmin;
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char *filename;
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char buf[T_BLOCKSIZE];
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char *pathname = 0;
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#ifndef _WIN32
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if (!TH_ISCHR(t))
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{
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errno = EINVAL;
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return -1;
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}
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#endif
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if (realname)
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{
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filename = realname;
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}
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else
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{
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pathname = th_get_pathname(t);
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filename = pathname;
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}
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mode = th_get_mode(t);
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devmaj = th_get_devmajor(t);
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devmin = th_get_devminor(t);
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/* Make a copy of the string because dirname and mkdirhier may modify the
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* string */
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strncpy(buf, filename, sizeof(buf)-1);
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buf[sizeof(buf)-1] = 0;
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if (mkdirhier(dirname(buf)) == -1)
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{
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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#ifdef DEBUG
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printf(" ==> extracting: %s (character device %ld,%ld)\n",
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filename, devmaj, devmin);
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#endif
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#ifndef WIN32
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if (mknod(filename, mode | S_IFCHR,
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compat_makedev(devmaj, devmin)) == -1)
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#else
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(void)devmin;
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(void)devmaj;
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(void)mode;
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#endif
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{
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#ifdef DEBUG
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perror("mknod()");
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#endif
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if (pathname)
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{
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free(pathname);
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}
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return -1;
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}
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|
|
#ifndef WIN32
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
/* block device */
|
|
int
|
|
tar_extract_blockdev(TAR *t, char *realname)
|
|
{
|
|
mode_t mode;
|
|
unsigned long devmaj, devmin;
|
|
char *filename;
|
|
char buf[T_BLOCKSIZE];
|
|
char *pathname = 0;
|
|
|
|
if (!TH_ISBLK(t))
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (realname)
|
|
{
|
|
filename = realname;
|
|
}
|
|
else
|
|
{
|
|
pathname = th_get_pathname(t);
|
|
filename = pathname;
|
|
}
|
|
mode = th_get_mode(t);
|
|
devmaj = th_get_devmajor(t);
|
|
devmin = th_get_devminor(t);
|
|
|
|
/* Make a copy of the string because dirname and mkdirhier may modify the
|
|
* string */
|
|
strncpy(buf, filename, sizeof(buf)-1);
|
|
buf[sizeof(buf)-1] = 0;
|
|
|
|
if (mkdirhier(dirname(buf)) == -1)
|
|
{
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf(" ==> extracting: %s (block device %ld,%ld)\n",
|
|
filename, devmaj, devmin);
|
|
#endif
|
|
#ifndef WIN32
|
|
if (mknod(filename, mode | S_IFBLK,
|
|
compat_makedev(devmaj, devmin)) == -1)
|
|
#else
|
|
(void)devmin;
|
|
(void)devmaj;
|
|
(void)mode;
|
|
#endif
|
|
{
|
|
#ifdef DEBUG
|
|
perror("mknod()");
|
|
#endif
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifndef WIN32
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
/* directory */
|
|
int
|
|
tar_extract_dir(TAR *t, char *realname)
|
|
{
|
|
mode_t mode;
|
|
char *filename;
|
|
char buf[T_BLOCKSIZE];
|
|
char *pathname = 0;
|
|
size_t len = 0;
|
|
|
|
if (!TH_ISDIR(t))
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (realname)
|
|
{
|
|
filename = realname;
|
|
}
|
|
else
|
|
{
|
|
pathname = th_get_pathname(t);
|
|
filename = pathname;
|
|
}
|
|
mode = th_get_mode(t);
|
|
|
|
/* Make a copy of the string because dirname and mkdirhier may modify the
|
|
* string */
|
|
strncpy(buf, filename, sizeof(buf)-1);
|
|
buf[sizeof(buf)-1] = 0;
|
|
|
|
if (mkdirhier(dirname(buf)) == -1)
|
|
{
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Strip trailing '/'...it confuses some Unixes (and BeOS)... */
|
|
strncpy(buf, filename, sizeof(buf)-1);
|
|
buf[sizeof(buf)-1] = 0;
|
|
len = strlen(buf);
|
|
if ((len > 0) && (buf[len-1] == '/'))
|
|
{
|
|
buf[len-1] = '\0';
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf(" ==> extracting: %s (mode %04o, directory)\n", filename,
|
|
mode);
|
|
#endif
|
|
#ifdef WIN32
|
|
if (mkdir(buf) == -1)
|
|
#else
|
|
if (mkdir(buf, mode & 07777) == -1)
|
|
#endif
|
|
{
|
|
#ifdef __BORLANDC__
|
|
/* There is a bug in the Borland Run time library which makes MKDIR
|
|
return EACCES when it should return EEXIST
|
|
if it is some other error besides directory exists
|
|
then return false */
|
|
if ( errno == EACCES)
|
|
{
|
|
errno = EEXIST;
|
|
}
|
|
#endif
|
|
if (errno == EEXIST)
|
|
{
|
|
if (chmod(filename, mode & 07777) == -1)
|
|
{
|
|
#ifdef DEBUG
|
|
perror("chmod()");
|
|
#endif
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
#ifdef DEBUG
|
|
puts(" *** using existing directory");
|
|
#endif
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
#ifdef DEBUG
|
|
perror("mkdir()");
|
|
#endif
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* FIFO */
|
|
int
|
|
tar_extract_fifo(TAR *t, char *realname)
|
|
{
|
|
mode_t mode;
|
|
char *filename;
|
|
char buf[T_BLOCKSIZE];
|
|
char *pathname = 0;
|
|
|
|
if (!TH_ISFIFO(t))
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (realname)
|
|
{
|
|
filename = realname;
|
|
}
|
|
else
|
|
{
|
|
pathname = th_get_pathname(t);
|
|
filename = pathname;
|
|
}
|
|
mode = th_get_mode(t);
|
|
|
|
/* Make a copy of the string because dirname and mkdirhier may modify the
|
|
* string */
|
|
strncpy(buf, filename, sizeof(buf)-1);
|
|
buf[sizeof(buf)-1] = 0;
|
|
|
|
if (mkdirhier(dirname(buf)) == -1)
|
|
{
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf(" ==> extracting: %s (fifo)\n", filename);
|
|
#endif
|
|
#ifndef WIN32
|
|
if (mkfifo(filename, mode & 07777) == -1)
|
|
#else
|
|
(void)mode;
|
|
#endif
|
|
{
|
|
#ifdef DEBUG
|
|
perror("mkfifo()");
|
|
#endif
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifndef WIN32
|
|
if (pathname)
|
|
{
|
|
free(pathname);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|