9a813e49aa
installing distributions. +force unlinks files before extracting them, +only adds *only* the specified files to an archive (i.e. doesn't descend into subdirectories).
754 lines
20 KiB
C
754 lines
20 KiB
C
/* Extract files from a tar archive.
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Copyright (C) 1988 Free Software Foundation
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This file is part of GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU Tar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Tar; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Extract files from a tar archive.
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*
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* Written 19 Nov 1985 by John Gilmore, ihnp4!hoptoad!gnu.
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*
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* @(#) extract.c 1.32 87/11/11 - gnu
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef BSD42
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#include <sys/file.h>
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#endif
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#ifdef USG
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#include <fcntl.h>
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#endif
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#ifdef MSDOS
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#include <fcntl.h>
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#endif /* MSDOS */
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/*
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* Some people don't have a #define for these.
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*/
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#ifndef O_NDELAY
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#define O_NDELAY 0
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#endif
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#ifdef NO_OPEN3
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/* We need the #define's even though we don't use them. */
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#include "open3.h"
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#endif
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#ifdef EMUL_OPEN3
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/* Simulated 3-argument open for systems that don't have it */
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#include "open3.h"
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#endif
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extern int errno; /* From libc.a */
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extern time_t time(); /* From libc.a */
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extern char *index(); /* From libc.a or port.c */
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#include "tar.h"
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#include "port.h"
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extern FILE *msg_file;
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extern union record *head; /* Points to current tape header */
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extern struct stat hstat; /* Stat struct corresponding */
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extern int head_standard; /* Tape header is in ANSI format */
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extern char *save_name;
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extern long save_totsize;
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extern long save_sizeleft;
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extern void print_header();
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extern void skip_file();
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extern void skip_extended_headers();
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extern void pr_mkdir();
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int make_dirs(); /* Makes required directories */
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static time_t now = 0; /* Current time */
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static we_are_root = 0; /* True if our effective uid == 0 */
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static int notumask = ~0; /* Masks out bits user doesn't want */
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/*
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* "Scratch" space to store the information about a sparse file before
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* writing the info into the header or extended header
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*/
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/*struct sp_array *sparsearray;*/
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/* number of elts storable in the sparsearray */
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/*int sp_array_size = 10;*/
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/*
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* Set up to extract files.
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*/
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extr_init()
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{
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int ourmask;
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now = time((time_t *)0);
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if (geteuid() == 0)
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we_are_root = 1;
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/*
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* We need to know our umask. But if f_use_protection is set,
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* leave our kernel umask at 0, and our "notumask" at ~0.
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*/
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ourmask = umask(0); /* Read it */
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if (!f_use_protection) {
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(void) umask (ourmask); /* Set it back how it was */
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notumask = ~ourmask; /* Make umask override permissions */
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}
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}
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/*
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* Extract a file from the archive.
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*/
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void
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extract_archive()
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{
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register char *data;
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int fd, check, namelen, written, openflag;
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long size;
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time_t acc_upd_times[2];
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register int skipcrud;
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register int i;
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int sparse_ind = 0;
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union record *exhdr;
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int end_nulls;
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saverec(&head); /* Make sure it sticks around */
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userec(head); /* And go past it in the archive */
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decode_header(head, &hstat, &head_standard, 1); /* Snarf fields */
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if(f_confirm && !confirm("extract",head->header.name)) {
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if (head->header.isextended)
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skip_extended_headers();
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skip_file((long)hstat.st_size);
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saverec((union record **)0);
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return;
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}
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/* Print the record from 'head' and 'hstat' */
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if (f_verbose)
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print_header();
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/*
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* Check for fully specified pathnames and other atrocities.
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*
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* Note, we can't just make a pointer to the new file name,
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* since saverec() might move the header and adjust "head".
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* We have to start from "head" every time we want to touch
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* the header record.
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*/
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skipcrud = 0;
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while (!f_absolute_paths && '/' == head->header.name[skipcrud]) {
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static int warned_once = 0;
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skipcrud++; /* Force relative path */
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if (!warned_once++) {
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msg("Removing leading / from absolute path names in the archive.");
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}
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}
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switch (head->header.linkflag) {
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default:
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msg("Unknown file type '%c' for %s, extracted as normal file",
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head->header.linkflag, skipcrud+head->header.name);
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/* FALL THRU */
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/*
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* JK - What we want to do if the file is sparse is loop through
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* the array of sparse structures in the header and read in
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* and translate the character strings representing 1) the offset
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* at which to write and 2) how many bytes to write into numbers,
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* which we store into the scratch array, "sparsearray". This
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* array makes our life easier the same way it did in creating
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* the tar file that had to deal with a sparse file.
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*
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* After we read in the first five (at most) sparse structures,
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* we check to see if the file has an extended header, i.e.,
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* if more sparse structures are needed to describe the contents
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* of the new file. If so, we read in the extended headers
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* and continue to store their contents into the sparsearray.
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*/
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case LF_SPARSE:
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sp_array_size = 10;
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sparsearray = (struct sp_array *) malloc(sp_array_size * sizeof(struct sp_array));
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for (i = 0; i < SPARSE_IN_HDR; i++) {
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sparsearray[i].offset =
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from_oct(1+12, head->header.sp[i].offset);
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sparsearray[i].numbytes =
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from_oct(1+12, head->header.sp[i].numbytes);
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if (!sparsearray[i].numbytes)
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break;
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}
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/* end_nulls = from_oct(1+12, head->header.ending_blanks);*/
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if (head->header.isextended) {
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/* read in the list of extended headers
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and translate them into the sparsearray
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as before */
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/* static */ int ind = SPARSE_IN_HDR;
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for (;;) {
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exhdr = findrec();
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for (i = 0; i < SPARSE_EXT_HDR; i++) {
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if (i+ind > sp_array_size-1) {
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/*
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* realloc the scratch area
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* since we've run out of room --
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*/
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sparsearray = (struct sp_array *)
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realloc(sparsearray,
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2 * sp_array_size * (sizeof(struct sp_array)));
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sp_array_size *= 2;
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}
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if (!exhdr->ext_hdr.sp[i].numbytes)
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break;
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sparsearray[i+ind].offset =
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from_oct(1+12, exhdr->ext_hdr.sp[i].offset);
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sparsearray[i+ind].numbytes =
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from_oct(1+12, exhdr->ext_hdr.sp[i].numbytes);
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}
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if (!exhdr->ext_hdr.isextended)
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break;
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else {
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ind += SPARSE_EXT_HDR;
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userec(exhdr);
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}
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}
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userec(exhdr);
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}
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/* FALL THRU */
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case LF_OLDNORMAL:
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case LF_NORMAL:
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case LF_CONTIG:
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/*
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* Appears to be a file.
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* See if it's really a directory.
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*/
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namelen = strlen(skipcrud+head->header.name)-1;
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if (head->header.name[skipcrud+namelen] == '/')
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goto really_dir;
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/* FIXME, deal with protection issues */
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again_file:
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openflag = (f_keep?
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O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_EXCL:
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O_BINARY|O_NDELAY|O_WRONLY|O_CREAT|O_TRUNC)
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| ((head->header.linkflag == LF_SPARSE) ? 0 : O_APPEND);
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/*
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* JK - The last | is a kludge to solve the problem
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* the O_APPEND flag causes with files we are
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* trying to make sparse: when a file is opened
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* with O_APPEND, it writes to the last place
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* that something was written, thereby ignoring
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* any lseeks that we have done. We add this
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* extra condition to make it able to lseek when
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* a file is sparse, i.e., we don't open the new
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* file with this flag. (Grump -- this bug caused
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* me to waste a good deal of time, I might add)
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*/
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if(f_exstdout) {
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fd = 1;
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goto extract_file;
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}
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#ifdef O_CTG
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/*
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* Contiguous files (on the Masscomp) have to specify
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* the size in the open call that creates them.
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*/
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if (head->header.linkflag == LF_CONTIG)
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fd = open(skipcrud+head->header.name, openflag | O_CTG,
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hstat.st_mode, hstat.st_size);
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else
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#endif
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{
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#ifdef NO_OPEN3
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/*
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* On raw V7 we won't let them specify -k (f_keep), but
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* we just bull ahead and create the files.
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*/
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if (f_force)
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unlink(skipcrud+head->header.name);
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fd = creat(skipcrud+head->header.name,
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hstat.st_mode);
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#else
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/*
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* With 3-arg open(), we can do this up right.
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*/
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if (f_force)
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unlink(skipcrud+head->header.name);
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fd = open(skipcrud+head->header.name, openflag,
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hstat.st_mode);
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#endif
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}
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if (fd < 0) {
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if (make_dirs(skipcrud+head->header.name))
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goto again_file;
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msg_perror("Could not create file %s",skipcrud+head->header.name);
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if (head->header.isextended)
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skip_extended_headers();
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skip_file((long)hstat.st_size);
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goto quit;
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}
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extract_file:
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if (head->header.linkflag == LF_SPARSE) {
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char *name;
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int namelen;
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/*
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* Kludge alert. NAME is assigned to header.name
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* because during the extraction, the space that
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* contains the header will get scribbled on, and
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* the name will get munged, so any error messages
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* that happen to contain the filename will look
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* REAL interesting unless we do this.
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*/
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namelen = strlen(skipcrud+head->header.name);
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name = (char *) malloc((sizeof(char)) * namelen);
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bcopy(skipcrud+head->header.name, name, namelen);
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size = hstat.st_size;
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extract_sparse_file(fd, &size, hstat.st_size,
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name);
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}
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else
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for (size = hstat.st_size;
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size > 0;
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size -= written) {
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long offset,
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numbytes;
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if(f_multivol) {
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save_name=head->header.name;
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save_totsize=hstat.st_size;
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save_sizeleft=size;
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}
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/*
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* Locate data, determine max length
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* writeable, write it, record that
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* we have used the data, then check
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* if the write worked.
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*/
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data = findrec()->charptr;
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if (data == NULL) { /* Check it... */
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msg("Unexpected EOF on archive file");
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break;
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}
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/*
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* JK - If the file is sparse, use the sparsearray
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* that we created before to lseek into the new
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* file the proper amount, and to see how many
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* bytes we want to write at that position.
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*/
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/* if (head->header.linkflag == LF_SPARSE) {
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off_t pos;
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pos = lseek(fd, (off_t) sparsearray[sparse_ind].offset, 0);
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printf("%d at %d\n", (int) pos, sparse_ind);
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written = sparsearray[sparse_ind++].numbytes;
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} else*/
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written = endofrecs()->charptr - data;
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if (written > size)
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written = size;
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errno = 0;
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check = write(fd, data, written);
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/*
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* The following is in violation of strict
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* typing, since the arg to userec
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* should be a struct rec *. FIXME.
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*/
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userec((union record *)(data + written - 1));
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if (check == written) continue;
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/*
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* Error in writing to file.
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* Print it, skip to next file in archive.
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*/
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if(check<0)
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msg_perror("couldn't write to file %s",skipcrud+head->header.name);
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else
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msg("could only write %d of %d bytes to file %s",written,check,skipcrud+head->header.name);
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skip_file((long)(size - written));
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break; /* Still do the close, mod time, chmod, etc */
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}
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if(f_multivol)
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save_name = 0;
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/* If writing to stdout, don't try to do anything
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to the filename; it doesn't exist, or we don't
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want to touch it anyway */
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if(f_exstdout)
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break;
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/* if (head->header.isextended) {
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register union record *exhdr;
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register int i;
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for (i = 0; i < 21; i++) {
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long offset;
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if (!exhdr->ext_hdr.sp[i].numbytes)
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break;
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offset = from_oct(1+12,
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exhdr->ext_hdr.sp[i].offset);
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written = from_oct(1+12,
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exhdr->ext_hdr.sp[i].numbytes);
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lseek(fd, offset, 0);
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check = write(fd, data, written);
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if (check == written) continue;
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}
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}*/
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check = close(fd);
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if (check < 0) {
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msg_perror("Error while closing %s",skipcrud+head->header.name);
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}
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set_filestat:
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/*
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* If we are root, set the owner and group of the extracted
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* file. This does what is wanted both on real Unix and on
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* System V. If we are running as a user, we extract as that
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* user; if running as root, we extract as the original owner.
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*/
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if (we_are_root || f_do_chown) {
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if (chown(skipcrud+head->header.name, hstat.st_uid,
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hstat.st_gid) < 0) {
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msg_perror("cannot chown file %s to uid %d gid %d",skipcrud+head->header.name,hstat.st_uid,hstat.st_gid);
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}
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}
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/*
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* Set the modified time of the file.
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*
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* Note that we set the accessed time to "now", which
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* is really "the time we started extracting files".
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* unless f_gnudump is used, in which case .st_atime is used
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*/
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if (!f_modified) {
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/* fixme if f_gnudump should set ctime too, but how? */
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if(f_gnudump)
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acc_upd_times[0]=hstat.st_atime;
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else acc_upd_times[0] = now; /* Accessed now */
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acc_upd_times[1] = hstat.st_mtime; /* Mod'd */
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if (utime(skipcrud+head->header.name,
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acc_upd_times) < 0) {
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msg_perror("couldn't change access and modification times of %s",skipcrud+head->header.name);
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}
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}
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/* We do the utime before the chmod because some versions of
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utime are broken and trash the modes of the file. Since
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we then change the mode anyway, we don't care. . . */
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/*
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* If '-k' is not set, open() or creat() could have saved
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* the permission bits from a previously created file,
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* ignoring the ones we specified.
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* Even if -k is set, if the file has abnormal
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* mode bits, we must chmod since writing or chown() has
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* probably reset them.
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*
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* If -k is set, we know *we* created this file, so the mode
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* bits were set by our open(). If the file is "normal", we
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* skip the chmod. This works because we did umask(0) if -p
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* is set, so umask will have left the specified mode alone.
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*/
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if ((!f_keep)
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|| (hstat.st_mode & (S_ISUID|S_ISGID|S_ISVTX))) {
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if (chmod(skipcrud+head->header.name,
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notumask & (int)hstat.st_mode) < 0) {
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msg_perror("cannot change mode of file %s to %ld",skipcrud+head->header.name,notumask & (int)hstat.st_mode);
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}
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}
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quit:
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break;
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case LF_LINK:
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again_link:
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{
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struct stat st1,st2;
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if (f_force)
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unlink(skipcrud+head->header.name);
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check = link (head->header.linkname,
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skipcrud+head->header.name);
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if (check == 0)
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break;
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if (make_dirs(skipcrud+head->header.name))
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goto again_link;
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if(f_gnudump && errno==EEXIST)
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break;
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if( stat(head->header.linkname, &st1) == 0
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|
&& stat(skipcrud+head->header.name, &st2)==0
|
|
&& st1.st_dev==st2.st_dev
|
|
&& st1.st_ino==st2.st_ino)
|
|
break;
|
|
msg_perror("Could not link %s to %s",
|
|
skipcrud+head->header.name,head->header.linkname);
|
|
}
|
|
break;
|
|
|
|
#ifdef S_IFLNK
|
|
case LF_SYMLINK:
|
|
again_symlink:
|
|
if (f_force)
|
|
unlink(skipcrud+head->header.name);
|
|
check = symlink(head->header.linkname,
|
|
skipcrud+head->header.name);
|
|
/* FIXME, don't worry uid, gid, etc... */
|
|
if (check == 0)
|
|
break;
|
|
if (make_dirs(skipcrud+head->header.name))
|
|
goto again_symlink;
|
|
msg_perror("Could not create symlink to %s",head->header.linkname);
|
|
break;
|
|
#endif
|
|
|
|
#ifdef S_IFCHR
|
|
case LF_CHR:
|
|
hstat.st_mode |= S_IFCHR;
|
|
goto make_node;
|
|
#endif
|
|
|
|
#ifdef S_IFBLK
|
|
case LF_BLK:
|
|
hstat.st_mode |= S_IFBLK;
|
|
goto make_node;
|
|
#endif
|
|
|
|
#ifdef S_IFIFO
|
|
/* If local system doesn't support FIFOs, use default case */
|
|
case LF_FIFO:
|
|
hstat.st_mode |= S_IFIFO;
|
|
hstat.st_rdev = 0; /* FIXME, do we need this? */
|
|
goto make_node;
|
|
#endif
|
|
|
|
make_node:
|
|
if (f_force)
|
|
unlink(skipcrud+head->header.name);
|
|
check = mknod(skipcrud+head->header.name,
|
|
(int) hstat.st_mode, (int) hstat.st_rdev);
|
|
if (check != 0) {
|
|
if (make_dirs(skipcrud+head->header.name))
|
|
goto make_node;
|
|
msg_perror("Could not make %s",skipcrud+head->header.name);
|
|
break;
|
|
};
|
|
goto set_filestat;
|
|
|
|
case LF_DIR:
|
|
case LF_DUMPDIR:
|
|
namelen = strlen(skipcrud+head->header.name)-1;
|
|
really_dir:
|
|
/* Check for trailing /, and zap as many as we find. */
|
|
while (namelen && head->header.name[skipcrud+namelen] == '/')
|
|
head->header.name[skipcrud+namelen--] = '\0';
|
|
if(f_gnudump) { /* Read the entry and delete files
|
|
that aren't listed in the archive */
|
|
gnu_restore(skipcrud);
|
|
|
|
} else if(head->header.linkflag==LF_DUMPDIR)
|
|
skip_file((long)(hstat.st_size));
|
|
|
|
|
|
again_dir:
|
|
check = mkdir(skipcrud+head->header.name,
|
|
(we_are_root ? 0 : 0300) | (int)hstat.st_mode);
|
|
if (check != 0) {
|
|
struct stat st1;
|
|
|
|
if (make_dirs(skipcrud+head->header.name))
|
|
goto again_dir;
|
|
/* If we're trying to create '.', let it be. */
|
|
if (head->header.name[skipcrud+namelen] == '.' &&
|
|
(namelen==0 ||
|
|
head->header.name[skipcrud+namelen-1]=='/'))
|
|
goto check_perms;
|
|
if( errno==EEXIST
|
|
&& stat(skipcrud+head->header.name,&st1)==0
|
|
&& (st1.st_mode&S_IFMT)==S_IFDIR)
|
|
break;
|
|
msg_perror("Could not create directory %s",skipcrud+head->header.name);
|
|
break;
|
|
}
|
|
|
|
check_perms:
|
|
if (!we_are_root && 0300 != (0300 & (int) hstat.st_mode)) {
|
|
hstat.st_mode |= 0300;
|
|
msg("Added write and execute permission to directory %s",
|
|
skipcrud+head->header.name);
|
|
}
|
|
|
|
goto set_filestat;
|
|
/* FIXME, Remember timestamps for after files created? */
|
|
/* FIXME, change mode after files created (if was R/O dir) */
|
|
case LF_VOLHDR:
|
|
if(f_verbose) {
|
|
printf("Reading %s\n",head->header.name);
|
|
}
|
|
break;
|
|
|
|
case LF_NAMES:
|
|
extract_mangle(head);
|
|
break;
|
|
|
|
case LF_MULTIVOL:
|
|
msg("Can't extract '%s'--file is continued from another volume\n",head->header.name);
|
|
skip_file((long)hstat.st_size);
|
|
break;
|
|
|
|
}
|
|
|
|
/* We don't need to save it any longer. */
|
|
saverec((union record **) 0); /* Unsave it */
|
|
}
|
|
|
|
/*
|
|
* After a file/link/symlink/dir creation has failed, see if
|
|
* it's because some required directory was not present, and if
|
|
* so, create all required dirs.
|
|
*/
|
|
int
|
|
make_dirs(pathname)
|
|
char *pathname;
|
|
{
|
|
char *p; /* Points into path */
|
|
int madeone = 0; /* Did we do anything yet? */
|
|
int save_errno = errno; /* Remember caller's errno */
|
|
int check;
|
|
|
|
if (errno != ENOENT)
|
|
return 0; /* Not our problem */
|
|
|
|
for (p = index(pathname, '/'); p != NULL; p = index(p+1, '/')) {
|
|
/* Avoid mkdir of empty string, if leading or double '/' */
|
|
if (p == pathname || p[-1] == '/')
|
|
continue;
|
|
/* Avoid mkdir where last part of path is '.' */
|
|
if (p[-1] == '.' && (p == pathname+1 || p[-2] == '/'))
|
|
continue;
|
|
*p = 0; /* Truncate the path there */
|
|
check = mkdir (pathname, 0777); /* Try to create it as a dir */
|
|
if (check == 0) {
|
|
/* Fix ownership */
|
|
if (we_are_root) {
|
|
if (chown(pathname, hstat.st_uid,
|
|
hstat.st_gid) < 0) {
|
|
msg_perror("cannot change owner of %s to uid %d gid %d",pathname,hstat.st_uid,hstat.st_gid);
|
|
}
|
|
}
|
|
pr_mkdir(pathname, p-pathname, notumask&0777);
|
|
madeone++; /* Remember if we made one */
|
|
*p = '/';
|
|
continue;
|
|
}
|
|
*p = '/';
|
|
if (errno == EEXIST) /* Directory already exists */
|
|
continue;
|
|
/*
|
|
* Some other error in the mkdir. We return to the caller.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
errno = save_errno; /* Restore caller's errno */
|
|
return madeone; /* Tell them to retry if we made one */
|
|
}
|
|
|
|
extract_sparse_file(fd, sizeleft, totalsize, name)
|
|
int fd;
|
|
long *sizeleft,
|
|
totalsize;
|
|
char *name;
|
|
{
|
|
register char *data;
|
|
union record *datarec;
|
|
int sparse_ind = 0;
|
|
int written,
|
|
count;
|
|
|
|
/* assuming sizeleft is initially totalsize */
|
|
|
|
|
|
while (*sizeleft > 0) {
|
|
datarec = findrec();
|
|
if (datarec == NULL) {
|
|
msg("Unexpected EOF on archive file");
|
|
return;
|
|
}
|
|
lseek(fd, sparsearray[sparse_ind].offset, 0);
|
|
written = sparsearray[sparse_ind++].numbytes;
|
|
while (written > RECORDSIZE) {
|
|
count = write(fd, datarec->charptr, RECORDSIZE);
|
|
if (count < 0)
|
|
msg_perror("couldn't write to file %s", name);
|
|
written -= count;
|
|
*sizeleft -= count;
|
|
userec(datarec);
|
|
datarec = findrec();
|
|
}
|
|
|
|
count = write(fd, datarec->charptr, written);
|
|
|
|
if (count < 0) {
|
|
msg_perror("couldn't write to file %s", name);
|
|
} else if (count != written) {
|
|
msg("could only write %d of %d bytes to file %s", totalsize - *sizeleft, totalsize, name);
|
|
skip_file((long) (*sizeleft));
|
|
}
|
|
|
|
written -= count;
|
|
*sizeleft -= count;
|
|
userec(datarec);
|
|
}
|
|
free(sparsearray);
|
|
/* if (end_nulls) {
|
|
register int i;
|
|
|
|
printf("%d\n", (int) end_nulls);
|
|
for (i = 0; i < end_nulls; i++)
|
|
write(fd, "\000", 1);
|
|
}*/
|
|
userec(datarec);
|
|
}
|