*
* Copyright (C) 2000 by Glenn McGrath
* Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
- *
+ *
* Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
*
* This program is free software; you can redistribute it and/or modify
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * Last modified 10 June 2000
+ * Last modified 9 September 2000
*/
-
-
#include <stdio.h>
+#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <utime.h>
+#include <unistd.h>
+#include <stdlib.h>
#include <sys/types.h>
+#include <sys/stat.h>
+#include <malloc.h>
#include "internal.h"
-#define AR_BLOCK_SIZE 60
-#define AR_PRESERVE_DATE 1 /* preserve original dates */
-#define AR_VERBOSE 2 /* be verbose */
-#define AR_DISPLAY 4 /* display contents */
-#define AR_EXT_TO_FILE 8 /* extract contents of archive */
-#define AR_EXT_TO_STDOUT 16 /* extract to stdout */
-
-#define BB_DECLARE_EXTERN
-#define bb_need_io_error
-#include "messages.c"
-
-struct ArHeader { /* Byte Offset */
- char ar_name[16]; /* 0-15 */
- char ar_date[12]; /* 16-27 */
- char ar_uid[6], ar_gid[6]; /* 28-39 */
- char ar_mode[8]; /* 40-47 */
- char ar_size[10]; /* 48-57 */
- char ar_fmag[2]; /* 58-59 */
-};
-typedef struct ArHeader ArHeader;
-
-struct ArInfo {
- char name[17]; /* File name */
- time_t date; /* long int, No of seconds since epoch */
- uid_t uid; /* unsigned int, Numeric UID */
- gid_t gid; /* unsigned int, Numeric GID */
- mode_t mode; /* unsigned int, Unix mode */
- size_t size; /* int, Size of the file */
-};
-typedef struct ArInfo ArInfo;
-
-static const char ar_usage[] = "ar [optxvV] archive [filenames] \n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nExtract or list files from an ar archive.\n\n"
- "Options:\n"
- "\to\t\tpreserve original dates\n"
- "\tp\t\textract to stdout\n"
- "\tt\t\tlist\n"
- "\tx\t\textract\n"
- "\tv\t\tverbosely list files processed\n"
+#define BLOCK_SIZE 60
+#define PRESERVE_DATE 1 /* preserve original dates */
+#define VERBOSE 2 /* be verbose */
+#define DISPLAY 4 /* display contents */
+#define EXT_TO_FILE 8 /* extract contents of archive */
+#define EXT_TO_STDOUT 16 /* extract to stdout */
+#define RECURSIVE 32
+
+#define MAX_NAME_LENGTH 100
+
+//#define BB_DECLARE_EXTERN
+//#define bb_need_io_error
+//#include "messages.c"
+
+//#define BB_AR_EXPERIMENTAL_UNTAR
+
+#if defined BB_AR_EXPERIMENTAL_UNTAR
+typedef struct rawTarHeader {
+ char name[100]; /* 0-99 */
+ char mode[8]; /* 100-107 */
+ char uid[8]; /* 108-115 */
+ char gid[8]; /* 116-123 */
+ char size[12]; /* 124-135 */
+ char mtime[12]; /* 136-147 */
+ char chksum[8]; /* 148-155 */
+ char typeflag; /* 156-156 */
+ char linkname[100]; /* 157-256 */
+ char magic[6]; /* 257-262 */
+ char version[2]; /* 263-264 */
+ char uname[32]; /* 265-296 */
+ char gname[32]; /* 297-328 */
+ char devmajor[8]; /* 329-336 */
+ char devminor[8]; /* 337-344 */
+ char prefix[155]; /* 345-499 */
+ char padding[12]; /* 500-512 */
+} rawTarHeader_t;
#endif
- ;
+typedef struct rawArHeader { /* Byte Offset */
+ char name[16]; /* 0-15 */
+ char date[12]; /* 16-27 */
+ char uid[6], gid[6]; /* 28-39 */
+ char mode[8]; /* 40-47 */
+ char size[10]; /* 48-57 */
+ char fmag[2]; /* 58-59 */
+} rawArHeader_t;
+
+typedef struct headerL {
+ char name[MAX_NAME_LENGTH];
+ size_t size;
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ time_t mtime;
+ off_t offset;
+ struct headerL *next;
+} headerL_t;
+
+#if defined BB_AR_EXPERIMENTAL_UNTAR
/*
- * Display details of a file, verbosly if funct=2
+ * identify Tar header (magic field) and reset srcFd to entry position
*/
-static void displayEntry(struct ArInfo *entry, int funct)
+static int checkTarMagic(int srcFd)
{
- /* TODO convert mode to string */
- if ((funct & AR_VERBOSE) == AR_VERBOSE)
- printf("%i %i/%i %8i %s ", entry->mode, entry->uid, entry->gid,
- entry->size, timeString(entry->date));
- printf("%s\n", entry->name);
+ off_t headerStart;
+ char magic[6];
+
+ headerStart = lseek(srcFd, 0, SEEK_CUR);
+ lseek(srcFd, (off_t) 257, SEEK_CUR);
+ fullRead(srcFd, magic, 6);
+ lseek(srcFd, headerStart, SEEK_SET);
+ if (strncmp(magic, "ustar", 5)!=0)
+ return(FALSE);
+ return(TRUE);
}
-/* this is from tar.c remove later*/
-static long getOctal(const char *cp, int size)
+
+static int readTarHeader(int srcFd, headerL_t *current)
{
- long val = 0;
+ rawTarHeader_t rawTarHeader;
+ unsigned char *temp = (unsigned char *) &rawTarHeader;
+ long sum = 0;
+ int i;
+ off_t initialOffset;
- for(;(size > 0) && (*cp == ' '); cp++, size--);
- if ((size == 0) || !isOctal(*cp))
- return -1;
- for(; (size > 0) && isOctal(*cp); size--) {
- val = val * 8 + *cp++ - '0';
+ initialOffset = lseek(srcFd, 0, SEEK_CUR);
+ if (fullRead(srcFd, (char *) &rawTarHeader, 512) != 512) {
+ lseek(srcFd, initialOffset, SEEK_SET);
+ return(FALSE);
}
- for (;(size > 0) && (*cp == ' '); cp++, size--);
- if ((size > 0) && *cp)
- return -1;
- return val;
-}
+ for (i = 0; i < 148 ; i++)
+ sum += temp[i];
+ sum += ' ' * 8;
+ for (i = 156; i < 512 ; i++)
+ sum += temp[i];
+ if (sum!= strtol(rawTarHeader.chksum, NULL, 8))
+ return(FALSE);
+ sscanf(rawTarHeader.name, "%s", current->name);
+ current->size = strtol(rawTarHeader.size, NULL, 8);
+ current->uid = strtol(rawTarHeader.uid, NULL, 8);
+ current->gid = strtol(rawTarHeader.gid, NULL, 8);
+ current->mode = strtol(rawTarHeader.mode, NULL, 8);
+ current->mtime = strtol(rawTarHeader.mtime, NULL, 8);
+ current->offset = lseek(srcFd, 0 , SEEK_CUR);
-/*
- * Converts from the char based struct to a new struct with stricter types
- */
-static int processArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
-{
- int count2;
- int count;
-
- /* check end of header marker is valid */
- if ((rawHeader->ar_fmag[0]!='`') || (rawHeader->ar_fmag[1]!='\n'))
- return(FALSE);
-
- /* convert filename */
- for (count = 0; count < 16; count++) {
- /* allow spaces in filename except at the end */
- if (rawHeader->ar_name[count] == ' ') {
- for (count2 = count; count2 < 16; count2++)
- if (!isspace(rawHeader->ar_name[count2]))
- break;
- if (count2 >= 16)
- break;
- }
- /* GNU ar uses '/' as an end of filename marker */
- if (rawHeader->ar_name[count] == '/')
- break;
- header->name[count] = rawHeader->ar_name[count];
- }
- header->name[count] = '\0';
- header->date = atoi(rawHeader->ar_date);
- header->uid = atoi(rawHeader->ar_uid);
- header->gid = atoi(rawHeader->ar_gid);
- header->mode = getOctal(rawHeader->ar_mode, sizeof(rawHeader->ar_mode));
- header->size = atoi(rawHeader->ar_size);
- return (TRUE);
+ current->next = (headerL_t *) xmalloc(sizeof(headerL_t));
+ current = current->next;
+ return(TRUE);
}
+#endif
/*
- * Copy size bytes from current position if srcFd to current position in dstFd
- * taken from tarExtractRegularFile in tar.c, remove later
+ * identify Ar header (magic) and reset srcFd to entry position
*/
-static int copySubFile(int srcFd, int dstFd, int copySize)
+static int checkArMagic(int srcFd)
{
- int readSize, writeSize, doneSize;
- char buffer[BUFSIZ];
-
- while (copySize > 0) {
- if (copySize > BUFSIZ)
- readSize = BUFSIZ;
- else
- readSize = copySize;
- writeSize = fullRead(srcFd, buffer, readSize);
- if (writeSize <= 0) {
- errorMsg(io_error, "copySubFile :", strerror(errno));
- return (FALSE);
- }
- doneSize = fullWrite(dstFd, buffer, writeSize);
- if (doneSize <= 0) {
- errorMsg(io_error, "copySubFile :", strerror(errno));
- return (FALSE);
- }
- copySize -= doneSize;
- }
- return (TRUE);
+ off_t headerStart;
+ char arMagic[8];
+
+ headerStart = lseek(srcFd, 0, SEEK_CUR);
+ if (fullRead(srcFd, arMagic, 8) != 8) {
+ printf("fatal error/n");
+ return (FALSE);
+ }
+ lseek(srcFd, headerStart, SEEK_SET);
+
+ if (strncmp(arMagic,"!<arch>",7) != 0)
+ return(FALSE);
+ return(TRUE);
}
/*
- * Extract the file described in ArInfo to the specified path
- * set the new files uid, gid and mode
- */
-static int extractToFile(struct ArInfo *file, int funct, int srcFd, const char *path)
+ * get, check and correct the converted header
+ */
+static int readArEntry(int srcFd, headerL_t *entry)
{
- int dstFd, temp;
- struct stat tmpStat;
- char *pathname = NULL;
- struct utimbuf newtime;
+ size_t nameLength;
+ rawArHeader_t rawArHeader;
+ off_t initialOffset;
+
+ initialOffset = lseek(srcFd, 0, SEEK_CUR);
+ if (fullRead(srcFd, (char *) &rawArHeader, 60) != 60) {
+ lseek(srcFd, initialOffset, SEEK_SET);
+ return(FALSE);
+ }
+ if ((rawArHeader.fmag[0]!='`') || (rawArHeader.fmag[1]!='\n')) {
+ lseek(srcFd, initialOffset, SEEK_SET);
+ return(FALSE);
+ }
+
+ strncpy(entry->name, rawArHeader.name, 16);
+ nameLength=strcspn(entry->name, " \\");
+ entry->name[nameLength]='\0';
+ parse_mode(rawArHeader.mode, &entry->mode);
+ entry->mtime = atoi(rawArHeader.date);
+ entry->uid = atoi(rawArHeader.uid);
+ entry->gid = atoi(rawArHeader.gid);
+ entry->size = (size_t) atoi(rawArHeader.size);
+ entry->offset = initialOffset + (off_t) 60;
+
+ nameLength = strcspn(entry->name, "/");
+
+ /* handle GNU style short filenames, strip trailing '/' */
+ if (nameLength > 0)
+ entry->name[nameLength]='\0';
- if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
- if (!createPath(path, 0777)) {
- fatalError("Cannot extract to specified path");
- return (FALSE);
+ /* handle GNU style long filenames */
+ if (nameLength == 0) {
+ /* escape from recursive call */
+ if (entry->name[1]=='0')
+ return(TRUE);
+
+ /* the data section contains the real filename */
+ if (entry->name[1]=='/') {
+ char tempName[MAX_NAME_LENGTH];
+
+ if (entry->size > MAX_NAME_LENGTH)
+ entry->size = MAX_NAME_LENGTH;
+ fullRead(srcFd, tempName, entry->size);
+ tempName[entry->size-3]='\0';
+
+ /* read the second header for this entry */
+ /* be carefull, this is recursive */
+ if (readArEntry(srcFd, entry)==FALSE)
+ return(FALSE);
+
+ if ((entry->name[0]='/') && (entry->name[1]='0'))
+ strcpy(entry->name, tempName);
+ else {
+ errorMsg("Invalid long filename\n");
+ return(FALSE);
+ }
}
}
- temp = (strlen(path) + 16);
- pathname = (char *) xmalloc(temp);
- pathname = strcpy(pathname, path);
- pathname = strcat(pathname, file->name);
- dstFd = device_open(pathname, O_WRONLY | O_CREAT);
- temp = copySubFile(srcFd, dstFd, file->size);
- fchown(dstFd, file->uid, file->gid);
- fchmod(dstFd, file->mode);
- close(dstFd);
- if ((funct&AR_PRESERVE_DATE)==AR_PRESERVE_DATE)
- newtime.modtime=file->date;
- else
- newtime.modtime=time(0);
- newtime.actime=time(0);
- temp = utime(pathname, &newtime);
- return (TRUE);
+ return(TRUE);
}
/*
- * Return a file descriptor for the specified file and do error checks
+ * return the headerL_t struct for the specified filename
*/
-static int getArFd(char *filename)
+static headerL_t *getHeaders(int srcFd, headerL_t *head, int funct)
{
- int arFd;
- char arVersion[8];
+#if defined BB_AR_EXPERIMENTAL_UNTAR
+ int tar=FALSE;
+#endif
+ int ar=FALSE;
+ headerL_t *list;
+ off_t initialOffset;
- arFd = open(filename, O_RDONLY);
- if (arFd < 0) {
- errorMsg("Error opening '%s': %s\n", filename, strerror(errno));
- return (FALSE);
- }
- if (fullRead(arFd, arVersion, 8) <= 0) {
- errorMsg( "ar: Unexpected EOF in archive\n");
- return (FALSE);
- }
- if (strncmp(arVersion,"!<arch>",7) != 0) {
- errorMsg("ar header fails check ");
- return(FALSE);
+ list = (headerL_t *) xmalloc(sizeof(headerL_t));
+ initialOffset=lseek(srcFd, 0, SEEK_CUR);
+ if (checkArMagic(srcFd)==TRUE)
+ ar=TRUE;
+
+#if defined BB_AR_EXPERIMENTAL_UNTAR
+ if (checkTarMagic(srcFd)==TRUE)
+ tar=TRUE;
+
+ if (tar==TRUE) {
+ while(readTarHeader(srcFd, list)==TRUE) {
+ off_t tarOffset;
+ list->next = (headerL_t *) xmalloc(sizeof(headerL_t));
+ *list->next = *head;
+ *head = *list;
+
+ /* recursive check for sub-archives */
+ if ((funct & RECURSIVE) == RECURSIVE)
+ head = getHeaders(srcFd, head, funct);
+ tarOffset = (off_t) head->size/512;
+ if ( head->size % 512 > 0)
+ tarOffset++;
+ tarOffset=tarOffset*512;
+ lseek(srcFd, head->offset + tarOffset, SEEK_SET);
+ }
}
- return arFd;
+#endif
+
+ if (ar==TRUE) {
+ lseek(srcFd, 8, SEEK_CUR);
+ while(1) {
+ if (readArEntry(srcFd, list) == FALSE) {
+ lseek(srcFd, ++initialOffset, SEEK_CUR);
+ if (readArEntry(srcFd, list) == FALSE)
+ return(head);
+ }
+ list->next = (headerL_t *) xmalloc(sizeof(headerL_t));
+ *list->next = *head;
+ *head = *list;
+ /* recursive check for sub-archives */
+ if (funct & RECURSIVE)
+ head = getHeaders(srcFd, head, funct);
+ lseek(srcFd, head->offset + head->size, SEEK_SET);
+ }
+ }
+ return(head);
}
/*
- * Step through the ar file and process it one entry at a time
- * fileList[0] is the name of the ar archive
- * fileList[1] and up are filenames to extract from the archive
- * funct contains flags to specify the actions to be performed
+ * find an entry in the linked list matching the filename
*/
-static int readArFile(char *fileList[16], int fileListSize, int funct)
+static headerL_t *findEntry(headerL_t *head, const char *filename)
{
- int arFd, status, extFileFlag, i, lastOffset=0;
- ArHeader rawArHeader;
- ArInfo arEntry;
-
- /* open the ar archive */
- arFd=getArFd(fileList[0]);
-
- /* read the first header, then loop until ono more headers */
- while ((status = fullRead(arFd, (char *) &rawArHeader, AR_BLOCK_SIZE))
- == AR_BLOCK_SIZE) {
-
- /* check the header is valid, if not try reading the header
- agian with an offset of 1, needed as some ar archive end
- with a '\n' which isnt counted in specified file size */
- if ((status=processArHeader(&rawArHeader, &arEntry))==FALSE ) {
- if ((i=lseek(arFd, 0, SEEK_CUR))==(lastOffset+60))
- lseek(arFd, lastOffset+1, SEEK_SET);
- else
- return(FALSE);
- }
- else {
- extFileFlag=0;
-
- if (funct&AR_DISPLAY)
- displayEntry(&arEntry, funct);
-
- /* check file was specified to be extracted only if
- some file were specified */
- if ((funct&AR_EXT_TO_FILE) || (funct&AR_EXT_TO_STDOUT)){
- if (fileListSize==1)
- extFileFlag=1;
- else {
- for( i=1; i<=fileListSize; i++)
- if ((status=(strcmp(fileList[i],arEntry.name)))==0)
- extFileFlag=1;
- }
- }
- if (extFileFlag==1) {
- if (funct&AR_EXT_TO_FILE)
- extractToFile(&arEntry, funct, arFd, "./");
- else
- copySubFile(arFd,fileno(stdout),arEntry.size);
- }
- else
- lseek(arFd, arEntry.size, SEEK_CUR);
- lastOffset=lseek(arFd, 0, SEEK_CUR);
- } /* if processArHeader */
- } /* while */
- return (TRUE);
+ while(head->next != NULL) {
+ if (strcmp(filename, head->name)==0)
+ return(head);
+ head=head->next;
+ }
+ return(NULL);
}
extern int ar_main(int argc, char **argv)
{
- int funct = 0, ret=0, i=0;
- char *fileList[16], c, *opt_ptr;
+ int funct = 0, opt=0;
+ int srcFd=0, dstFd=0;
+ headerL_t *header, *entry, *extractList;
- if (argc < 2)
- usage(ar_usage);
-
- opt_ptr = argv[1];
- if (*opt_ptr == '-')
- ++opt_ptr;
- while ((c = *opt_ptr++) != '\0') {
- switch (c) {
+ while ((opt = getopt(argc, argv, "ovtpxR")) != -1) {
+ switch (opt) {
case 'o':
- funct = funct | AR_PRESERVE_DATE;
+ funct |= PRESERVE_DATE;
break;
case 'v':
- funct = funct | AR_VERBOSE;
+ funct |= VERBOSE;
break;
case 't':
- funct = funct | AR_DISPLAY;
+ funct |= DISPLAY;
break;
case 'x':
- funct = funct | AR_EXT_TO_FILE;
+ funct |= EXT_TO_FILE;
break;
case 'p':
- funct = funct | AR_EXT_TO_STDOUT;
+ funct |= EXT_TO_STDOUT;
+ break;
+ case 'R':
+ funct |= RECURSIVE;
break;
default:
usage(ar_usage);
}
}
-
- for(i=0; i<(argc-2); i++)
- fileList[i]=argv[i+2];
+
+ /* check the src filename was specified */
+ if (optind == argc) {
+ usage(ar_usage);
+ return(FALSE);
+ }
- if (funct > 3)
- ret = readArFile(fileList, (argc-2), funct);
+ if ( (srcFd = open(argv[optind], O_RDONLY)) < 0) {
+ errorMsg("Cannot read %s\n", optarg);
+ return (FALSE);
+ }
+ optind++;
+ entry = (headerL_t *) xmalloc(sizeof(headerL_t));
+ header = (headerL_t *) xmalloc(sizeof(headerL_t));
+ extractList = (headerL_t *) xmalloc(sizeof(headerL_t));
+
+ header = getHeaders(srcFd, header, funct);
+ /* find files to extract or display */
+ if (optind<argc) {
+ /* only handle specified files */
+ while(optind < argc) {
+ if ( (entry = findEntry(header, argv[optind])) != NULL) {
+ entry->next = (headerL_t *) xmalloc(sizeof(headerL_t));
+ *entry->next = *extractList;
+ *extractList = *entry;
+ }
+ optind++;
+ }
+ }
+ else
+ extractList = header;
- return (ret);
+ while(extractList->next != NULL) {
+ if (funct & EXT_TO_FILE) {
+ if (isDirectory(extractList->name, TRUE, NULL)==FALSE)
+ createPath(extractList->name, 0666);
+ dstFd = open(extractList->name, O_WRONLY | O_CREAT, extractList->mode);
+ lseek(srcFd, extractList->offset, SEEK_SET);
+ copySubFile(srcFd, dstFd, (size_t) extractList->size);
+ }
+ if (funct & EXT_TO_STDOUT) {
+ lseek(srcFd, extractList->offset, SEEK_SET);
+ copySubFile(srcFd, fileno(stdout), (size_t) extractList->size);
+ }
+ if ( (funct & DISPLAY) || (funct & VERBOSE)) {
+ if (funct & VERBOSE)
+ printf("%s %d/%d %8d %s ", modeString(extractList->mode),
+ extractList->uid, extractList->gid,
+ extractList->size, timeString(extractList->mtime));
+ printf("%s\n", extractList->name);
+ }
+ extractList=extractList->next;
+ }
+ return (TRUE);
}
projects / oweals / busybox.git / blobdiff