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392 lines
11 KiB
C
392 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ar implementation for busybox
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*
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* Copyright (C) 2000 by Glenn McGrath
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* Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
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*
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* Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Last modified 20 September 2000
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <time.h>
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#include <utime.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <malloc.h>
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#include "busybox.h"
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#define BLOCK_SIZE 60
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#define PRESERVE_DATE 1 /* preserve original dates */
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#define VERBOSE 2 /* be verbose */
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#define DISPLAY 4 /* display contents */
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#define EXT_TO_FILE 8 /* extract contents of archive */
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#define EXT_TO_STDOUT 16 /* extract to stdout */
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#define RECURSIVE 32
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#define MAX_NAME_LENGTH 100
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//#define BB_DECLARE_EXTERN
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//#define bb_need_io_error
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//#include "messages.c"
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//#define BB_AR_EXPERIMENTAL_UNTAR
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#if defined BB_AR_EXPERIMENTAL_UNTAR
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typedef struct rawTarHeader {
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char name[100]; /* 0-99 */
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char mode[8]; /* 100-107 */
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char uid[8]; /* 108-115 */
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char gid[8]; /* 116-123 */
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char size[12]; /* 124-135 */
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char mtime[12]; /* 136-147 */
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char chksum[8]; /* 148-155 */
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char typeflag; /* 156-156 */
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char linkname[100]; /* 157-256 */
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char magic[6]; /* 257-262 */
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char version[2]; /* 263-264 */
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char uname[32]; /* 265-296 */
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char gname[32]; /* 297-328 */
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char devmajor[8]; /* 329-336 */
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char devminor[8]; /* 337-344 */
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char prefix[155]; /* 345-499 */
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char padding[12]; /* 500-512 */
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} rawTarHeader_t;
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#endif
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typedef struct rawArHeader { /* Byte Offset */
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char name[16]; /* 0-15 */
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char date[12]; /* 16-27 */
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char uid[6], gid[6]; /* 28-39 */
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char mode[8]; /* 40-47 */
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char size[10]; /* 48-57 */
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char fmag[2]; /* 58-59 */
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} rawArHeader_t;
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typedef struct headerL {
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char name[MAX_NAME_LENGTH];
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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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mode_t mode;
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time_t mtime;
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off_t offset;
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struct headerL *next;
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} headerL_t;
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#if defined BB_AR_EXPERIMENTAL_UNTAR
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/*
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* identify Tar header (magic field) and reset srcFd to entry position
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*/
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static int checkTarMagic(int srcFd)
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{
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off_t headerStart;
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char magic[6];
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headerStart = lseek(srcFd, 0, SEEK_CUR);
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lseek(srcFd, (off_t) 257, SEEK_CUR);
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fullRead(srcFd, magic, 6);
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lseek(srcFd, headerStart, SEEK_SET);
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if (strncmp(magic, "ustar", 5)!=0)
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return(FALSE);
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return(TRUE);
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}
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static int readTarHeader(int srcFd, headerL_t *current)
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{
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rawTarHeader_t rawTarHeader;
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unsigned char *temp = (unsigned char *) &rawTarHeader;
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long sum = 0;
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int i;
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off_t initialOffset;
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initialOffset = lseek(srcFd, 0, SEEK_CUR);
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if (fullRead(srcFd, (char *) &rawTarHeader, 512) != 512) {
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lseek(srcFd, initialOffset, SEEK_SET);
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return(FALSE);
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}
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for (i = 0; i < 148 ; i++)
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sum += temp[i];
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sum += ' ' * 8;
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for (i = 156; i < 512 ; i++)
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sum += temp[i];
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if (sum!= strtol(rawTarHeader.chksum, NULL, 8))
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return(FALSE);
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sscanf(rawTarHeader.name, "%s", current->name);
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current->size = strtol(rawTarHeader.size, NULL, 8);
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current->uid = strtol(rawTarHeader.uid, NULL, 8);
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current->gid = strtol(rawTarHeader.gid, NULL, 8);
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current->mode = strtol(rawTarHeader.mode, NULL, 8);
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current->mtime = strtol(rawTarHeader.mtime, NULL, 8);
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current->offset = lseek(srcFd, 0 , SEEK_CUR);
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current->next = (headerL_t *) xmalloc(sizeof(headerL_t));
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current = current->next;
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return(TRUE);
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}
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#endif
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/*
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* identify Ar header (magic) and reset srcFd to entry position
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*/
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static int checkArMagic(int srcFd)
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{
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off_t headerStart;
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char arMagic[8];
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headerStart = lseek(srcFd, 0, SEEK_CUR);
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if (fullRead(srcFd, arMagic, 8) != 8) {
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errorMsg("fatal error\n");
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return (FALSE);
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}
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lseek(srcFd, headerStart, SEEK_SET);
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if (strncmp(arMagic,"!<arch>",7) != 0)
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return(FALSE);
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return(TRUE);
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}
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/*
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* get, check and correct the converted header
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*/
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static int readArEntry(int srcFd, headerL_t *entry)
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{
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size_t nameLength;
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rawArHeader_t rawArHeader;
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off_t initialOffset;
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initialOffset = lseek(srcFd, 0, SEEK_CUR);
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if (fullRead(srcFd, (char *) &rawArHeader, 60) != 60) {
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lseek(srcFd, initialOffset, SEEK_SET);
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return(FALSE);
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}
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if ((rawArHeader.fmag[0]!='`') || (rawArHeader.fmag[1]!='\n')) {
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lseek(srcFd, initialOffset, SEEK_SET);
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return(FALSE);
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}
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strncpy(entry->name, rawArHeader.name, 16);
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nameLength=strcspn(entry->name, " \\");
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entry->name[nameLength]='\0';
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parse_mode(rawArHeader.mode, &entry->mode);
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entry->mtime = atoi(rawArHeader.date);
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entry->uid = atoi(rawArHeader.uid);
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entry->gid = atoi(rawArHeader.gid);
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entry->size = (size_t) atoi(rawArHeader.size);
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entry->offset = initialOffset + (off_t) 60;
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nameLength = strcspn(entry->name, "/");
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/* handle GNU style short filenames, strip trailing '/' */
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if (nameLength > 0)
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entry->name[nameLength]='\0';
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/* handle GNU style long filenames */
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if (nameLength == 0) {
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/* escape from recursive call */
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if (entry->name[1]=='0')
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return(TRUE);
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/* the data section contains the real filename */
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if (entry->name[1]=='/') {
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char tempName[MAX_NAME_LENGTH];
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if (entry->size > MAX_NAME_LENGTH)
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entry->size = MAX_NAME_LENGTH;
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fullRead(srcFd, tempName, entry->size);
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tempName[entry->size-3]='\0';
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/* read the second header for this entry */
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/* be carefull, this is recursive */
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if (readArEntry(srcFd, entry)==FALSE)
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return(FALSE);
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if ((entry->name[0]='/') && (entry->name[1]='0'))
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strcpy(entry->name, tempName);
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else {
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errorMsg("Invalid long filename\n");
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return(FALSE);
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}
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}
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}
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return(TRUE);
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}
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/*
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* return the headerL_t struct for the specified filename
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*/
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static headerL_t *getHeaders(int srcFd, headerL_t *head, int funct)
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{
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#if defined BB_AR_EXPERIMENTAL_UNTAR
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int tar=FALSE;
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#endif
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int ar=FALSE;
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headerL_t *list;
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off_t initialOffset;
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list = (headerL_t *) xmalloc(sizeof(headerL_t));
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initialOffset=lseek(srcFd, 0, SEEK_CUR);
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if (checkArMagic(srcFd)==TRUE)
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ar=TRUE;
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#if defined BB_AR_EXPERIMENTAL_UNTAR
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if (checkTarMagic(srcFd)==TRUE)
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tar=TRUE;
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if (tar==TRUE) {
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while(readTarHeader(srcFd, list)==TRUE) {
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off_t tarOffset;
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list->next = (headerL_t *) xmalloc(sizeof(headerL_t));
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*list->next = *head;
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*head = *list;
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/* recursive check for sub-archives */
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if ((funct & RECURSIVE) == RECURSIVE)
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head = getHeaders(srcFd, head, funct);
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tarOffset = (off_t) head->size/512;
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if ( head->size % 512 > 0)
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tarOffset++;
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tarOffset=tarOffset*512;
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lseek(srcFd, head->offset + tarOffset, SEEK_SET);
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}
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}
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#endif
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if (ar==TRUE) {
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lseek(srcFd, 8, SEEK_CUR);
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while(1) {
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if (readArEntry(srcFd, list) == FALSE) {
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lseek(srcFd, ++initialOffset, SEEK_CUR);
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if (readArEntry(srcFd, list) == FALSE)
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return(head);
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}
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list->next = (headerL_t *) xmalloc(sizeof(headerL_t));
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*list->next = *head;
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*head = *list;
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/* recursive check for sub-archives */
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if (funct & RECURSIVE)
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head = getHeaders(srcFd, head, funct);
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lseek(srcFd, head->offset + head->size, SEEK_SET);
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}
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}
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return(head);
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}
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/*
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* find an entry in the linked list matching the filename
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*/
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static headerL_t *findEntry(headerL_t *head, const char *filename)
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{
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while(head->next != NULL) {
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if (strcmp(filename, head->name)==0)
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return(head);
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head=head->next;
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}
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return(NULL);
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}
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extern int ar_main(int argc, char **argv)
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{
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int funct = 0, opt=0;
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int srcFd=0, dstFd=0;
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headerL_t *header, *entry, *extractList;
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while ((opt = getopt(argc, argv, "ovtpxR")) != -1) {
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switch (opt) {
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case 'o':
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funct |= PRESERVE_DATE;
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break;
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case 'v':
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funct |= VERBOSE;
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break;
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case 't':
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funct |= DISPLAY;
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break;
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case 'x':
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funct |= EXT_TO_FILE;
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break;
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case 'p':
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funct |= EXT_TO_STDOUT;
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break;
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case 'R':
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funct |= RECURSIVE;
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break;
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default:
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usage(ar_usage);
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}
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}
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/* check the src filename was specified */
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if (optind == argc)
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usage(ar_usage);
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if ( (srcFd = open(argv[optind], O_RDONLY)) < 0)
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fatalError("Cannot read %s\n", argv[optind]);
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optind++;
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entry = (headerL_t *) xmalloc(sizeof(headerL_t));
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header = (headerL_t *) xmalloc(sizeof(headerL_t));
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extractList = (headerL_t *) xmalloc(sizeof(headerL_t));
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header = getHeaders(srcFd, header, funct);
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/* find files to extract or display */
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if (optind<argc) {
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/* only handle specified files */
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while(optind < argc) {
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if ( (entry = findEntry(header, argv[optind])) != NULL) {
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entry->next = (headerL_t *) xmalloc(sizeof(headerL_t));
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*entry->next = *extractList;
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*extractList = *entry;
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}
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optind++;
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}
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}
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else
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extractList = header;
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while(extractList->next != NULL) {
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if (funct & EXT_TO_FILE) {
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if (isDirectory(extractList->name, TRUE, NULL)==FALSE)
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createPath(extractList->name, 0666);
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dstFd = open(extractList->name, O_WRONLY | O_CREAT, extractList->mode);
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lseek(srcFd, extractList->offset, SEEK_SET);
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copySubFile(srcFd, dstFd, (size_t) extractList->size);
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}
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if (funct & EXT_TO_STDOUT) {
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lseek(srcFd, extractList->offset, SEEK_SET);
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copySubFile(srcFd, fileno(stdout), (size_t) extractList->size);
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}
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if ( (funct & DISPLAY) || (funct & VERBOSE)) {
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if (funct & VERBOSE)
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printf("%s %d/%d %8d %s ", modeString(extractList->mode),
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extractList->uid, extractList->gid,
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extractList->size, timeString(extractList->mtime));
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printf("%s\n", extractList->name);
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}
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extractList=extractList->next;
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}
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return (TRUE);
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}
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