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Phrack Inc. Volume 09 Issue 55 File 19
-------[ Phrack Magazine --- Vol. 9 | Issue 55 --- 09.09.99 --- 19 of 19 ]
-------------------------[ Phrack Magzine Extraction Utility ]
--------[ Phrack Staff ]
New this issue: The C version has support for crc checks.
---------------------8<------------CUT-HERE----------->8---------------------
<++> P55/EX/PMEU/extract4.c !9d35b676
/*
* extract.c by Phrack Staff and sirsyko
*
* Copyright (c) 1997 - 1999 Phrack Magazine
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* extract.c
* Extracts textfiles from a specially tagged flatfile into a hierarchical
* directory structure. Use to extract source code from any of the articles
* in Phrack Magazine (first appeared in Phrack 50).
*
* Extraction tags are of the form:
*
* host:~> cat testfile
* irrelevant file contents
* <++> path_and_filename1 !CRC32
* file contents
* <-->
* irrelevant file contents
* <++> path_and_filename2 !CRC32
* file contents
* <-->
* irrelevant file contents
* <++> path_and_filenamen !CRC32
* file contents
* <-->
* irrelevant file contents
* EOF
*
* The `!CRC` is optional. The filename is not. To generate crc32 values
* for your files, simply give them a dummy value initially. The program
* will attempt to verify the crc and fail, dumping the expected crc value.
* Use that one. i.e.:
*
* host:~> cat testfile
* this text is ignored by the program
* <++> testarooni !12345678
* text to extract into a file named testarooni
* as is this text
* <-->
*
* host:~> ./extract testfile
* Opened testfile
* - Extracting testarooni
* crc32 failed (12345678 != 4a298f18)
* Extracted 1 file(s).
*
* You would use `4a298f18` as your crc value.
*
* Compilation:
* gcc -o extract extract.c
*
* ./extract file1 file2 ... filen
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#define BEGIN_TAG "<++> "
#define END_TAG "<-->"
#define BT_SIZE strlen(BEGIN_TAG)
#define ET_SIZE strlen(END_TAG)
struct f_name
{
u_char name[256];
struct f_name *next;
};
unsigned long crcTable[256];
void crcgen()
{
unsigned long crc, poly;
int i, j;
poly = 0xEDB88320L;
for (i = 0; i < 256; i++)
{
crc = i;
for (j = 8; j > 0; j--)
{
if (crc & 1)
{
crc = (crc >> 1) ^ poly;
}
else
{
crc >>= 1;
}
}
crcTable[i] = crc;
}
}
unsigned long check_crc(FILE *fp)
{
register unsigned long crc;
int c;
crc = 0xFFFFFFFF;
while( (c = getc(fp)) != EOF )
{
crc = ((crc >> 8) & 0x00FFFFFF) ^ crcTable[(crc ^ c) & 0xFF];
}
if (fseek(fp, 0, SEEK_SET) == -1)
{
perror("fseek");
exit(EXIT_FAILURE);
}
return (crc ^ 0xFFFFFFFF);
}
int
main(int argc, char **argv)
{
u_char b[256], *bp, *fn;
int i, j = 0, h_c = 0;
unsigned long crc = 0, crc_f = 0;
FILE *in_p, *out_p = NULL;
struct f_name *fn_p = NULL, *head = NULL, *tmp = NULL;
char *name;
if (argc < 2)
{
printf("Usage: %s file1 file2 ... filen\n", argv[0]);
exit(0);
}
/*
* Fill the f_name list with all the files on the commandline (ignoring
* argv[0] which is this executable). This includes globs.
*/
for (i = 1; (fn = argv[i++]); )
{
if (!head)
{
if (!(head = (struct f_name *)malloc(sizeof(struct f_name))))
{
perror("malloc");
exit(EXIT_FAILURE);
}
strncpy(head->name, fn, sizeof(head->name));
head->next = NULL;
fn_p = head;
}
else
{
if (!(fn_p->next = (struct f_name *)malloc(sizeof(struct f_name))))
{
perror("malloc");
exit(EXIT_FAILURE);
}
fn_p = fn_p->next;
strncpy(fn_p->name, fn, sizeof(fn_p->name));
fn_p->next = NULL;
}
}
/*
* Sentry node.
*/
if (!(fn_p->next = (struct f_name *)malloc(sizeof(struct f_name))))
{
perror("malloc");
exit(EXIT_FAILURE);
}
fn_p = fn_p->next;
fn_p->next = NULL;
/*
* Check each file in the f_name list for extraction tags.
*/
for (fn_p = head; fn_p->next; )
{
if (!strcmp(fn_p->name, "-"))
{
in_p = stdin;
name = "stdin";
}
else if (!(in_p = fopen(fn_p->name, "r")))
{
fprintf(stderr, "Could not open input file %s.\n", fn_p->name);
continue;
}
else
{
name = fn_p->name;
}
fprintf(stderr, "Scanning %s...\n", fn_p->name);
crcgen();
while (fgets(b, 256, in_p))
{
if (!strncmp(b, BEGIN_TAG, BT_SIZE))
{
b[strlen(b) - 1] = 0; /* Now we have a string. */
j++;
crc = 0;
crc_f = 0;
if ((bp = strchr(b + BT_SIZE + 1, '/')))
{
while (bp)
{
*bp = 0;
if (mkdir(b + BT_SIZE, 0700) == -1 && errno != EEXIST)
{
perror("mkdir");
exit(EXIT_FAILURE);
}
*bp = '/';
bp = strchr(bp + 1, '/');
}
}
if ((bp = strchr(b, '!')))
{
crc_f =
strtoul((b + (strlen(b) - strlen(bp)) + 1), NULL, 16);
b[strlen(b) - strlen(bp) - 1 ] = 0;
h_c = 1;
}
else
{
h_c = 0;
}
if ((out_p = fopen(b + BT_SIZE, "wb+")))
{
printf(". Extracting %s\n", b + BT_SIZE);
}
else
{
printf(". Could not extract anything from '%s'.\n",
b + BT_SIZE);
continue;
}
}
else if (!strncmp (b, END_TAG, ET_SIZE))
{
if (out_p)
{
if (h_c == 1)
{
if (fseek(out_p, 0l, 0) == -1)
{
perror("fseek");
exit(EXIT_FAILURE);
}
crc = check_crc(out_p);
if (crc == crc_f)
{
printf(". CRC32 verified (%08lx)\n", crc);
}
else
{
printf(". CRC32 failed (%08lx != %08lx)\n",
crc_f, crc);
}
}
fclose(out_p);
}
else
{
fprintf(stderr, ". `%s` had bad tags.\n", fn_p->name);
continue;
}
}
else if (out_p)
{
fputs(b, out_p);
}
}
if (in_p != stdin)
{
fclose(in_p);
}
tmp = fn_p;
fn_p = fn_p->next;
free(tmp);
}
if (!j)
{
printf("No extraction tags found in list.\n");
}
else
{
printf("Extracted %d file(s).\n", j);
}
return (0);
}
/* EOF */
<-->
<++> P55/EX/PMEU/extract.pl !1a19d427
# Daos <daos@nym.alias.net>
#!/bin/sh -- # -*- perl -*- -n
eval 'exec perl $0 -S ${1+"$@"}' if 0;
$opening=0;
if (/^\<\+\+\>/) {$curfile = substr($_ , 5); $opening=1;};
if (/^\<\-\-\>/) {close ct_ex; $opened=0;};
if ($opening) {
chop $curfile;
$sex_dir= substr( $curfile, 0, ((rindex($curfile,'/'))) ) if ($curfile =~ m/\//);
eval {mkdir $sex_dir, "0777";};
open(ct_ex,">$curfile");
print "Attempting extraction of $curfile\n";
$opened=1;
}
if ($opened && !$opening) {print ct_ex $_};
<-->
<++> P55/EX/PMEU/extract.awk !26522c51
#!/usr/bin/awk -f
#
# Yet Another Extraction Script
# - <sirsyko>
#
/^\<\+\+\>/ {
ind = 1
File = $2
split ($2, dirs, "/")
Dir="."
while ( dirs[ind+1] ) {
Dir=Dir"/"dirs[ind]
system ("mkdir " Dir" 2>/dev/null")
++ind
}
next
}
/^\<\-\-\>/ {
File = ""
next
}
File { print >> File }
<-->
<++> P55/EX/PMEU/extract.sh !a81a2320
#!/bin/sh
# exctract.sh : Written 9/2/1997 for the Phrack Staff by <sirsyko>
#
# note, this file will create all directories relative to the current directory
# originally a bug, I've now upgraded it to a feature since I dont want to deal
# with the leading / (besides, you dont want hackers giving you full pathnames
# anyway, now do you :)
# Hopefully this will demonstrate another useful aspect of IFS other than
# haxoring rewt
#
# Usage: ./extract.sh <filename>
cat $* | (
Working=1
while [ $Working ];
do
OLDIFS1="$IFS"
IFS=
if read Line; then
IFS="$OLDIFS1"
set -- $Line
case "$1" in
"<++>") OLDIFS2="$IFS"
IFS=/
set -- $2
IFS="$OLDIFS2"
while [ $# -gt 1 ]; do
File=${File:-"."}/$1
if [ ! -d $File ]; then
echo "Making dir $File"
mkdir $File
fi
shift
done
File=${File:-"."}/$1
echo "Storing data in $File"
;;
"<-->") if [ "x$File" != "x" ]; then
unset File
fi ;;
*) if [ "x$File" != "x" ]; then
IFS=
echo "$Line" >> $File
IFS="$OLDIFS1"
fi
;;
esac
IFS="$OLDIFS1"
else
echo "End of file"
unset Working
fi
done
)
<-->
<++> P55/EX/PMEU/extract.py !83f65f60
#! /bin/env python
# extract.py Timmy 2tone <_spoon_@usa.net>
import sys, string, getopt, os
class Datasink:
"""Looks like a file, but doesn't do anything."""
def write(self, data): pass
def close(self): pass
def extract(input, verbose = 1):
"""Read a file from input until we find the end token."""
if type(input) == type('string'):
fname = input
try: input = open(fname)
except IOError, (errno, why):
print "Can't open %s: %s" % (fname, why)
return errno
else:
fname = '<file descriptor %d>' % input.fileno()
inside_embedded_file = 0
linecount = 0
line = input.readline()
while line:
if not inside_embedded_file and line[:4] == '<++>':
inside_embedded_file = 1
linecount = 0
filename = string.strip(line[4:])
if mkdirs_if_any(filename) != 0:
pass
try: output = open(filename, 'w')
except IOError, (errno, why):
print "Can't open %s: %s; skipping file" % (filename, why)
output = Datasink()
continue
if verbose:
print 'Extracting embedded file %s from %s...' % (filename,
fname),
elif inside_embedded_file and line[:4] == '<-->':
output.close()
inside_embedded_file = 0
if verbose and not isinstance(output, Datasink):
print '[%d lines]' % linecount
elif inside_embedded_file:
output.write(line)
# Else keep looking for a start token.
line = input.readline()
linecount = linecount + 1
def mkdirs_if_any(filename, verbose = 1):
"""Check for existance of /'s in filename, and make directories."""
path, file = os.path.split(filename)
if not path: return
errno = 0
start = os.getcwd()
components = string.split(path, os.sep)
for dir in components:
if not os.path.exists(dir):
try:
os.mkdir(dir)
if verbose: print 'Created directory', path
except os.error, (errno, why):
print "Can't make directory %s: %s" % (dir, why)
break
try: os.chdir(dir)
except os.error, (errno, why):
print "Can't cd to directory %s: %s" % (dir, why)
break
os.chdir(start)
return errno
def usage():
"""Blah."""
die('Usage: extract.py [-V] filename [filename...]')
def main():
try: optlist, args = getopt.getopt(sys.argv[1:], 'V')
except getopt.error, why: usage()
if len(args) <= 0: usage()
if ('-V', '') in optlist: verbose = 0
else: verbose = 1
for filename in args:
if verbose: print 'Opening source file', filename + '...'
extract(filename, verbose)
def db(filename = 'P51-11'):
"""Run this script in the python debugger."""
import pdb
sys.argv[1:] = ['-v', filename]
pdb.run('extract.main()')
def die(msg, errcode = 1):
print msg
sys.exit(errcode)
if __name__ == '__main__':
try: main()
except KeyboardInterrupt: pass
except getopt.error, why: usage()
if len(args) <= 0: usage()
if ('-V', '') in optlist: verbose = 0
else: verbose = 1
for filename in args:
if verbose: print 'Opening source file', filename + '...'
extract(filename, verbose)
def db(filename = 'P51-11'):
"""Run this script in the python debugger."""
import pdb
sys.argv[1:] = [filename]
pdb.run('extract.main()')
def die(msg, errcode = 1):
print msg
sys.exit(errcode)
if __name__ == '__main__':
try: main()
except KeyboardInterrupt: pass # No messy traceback.
<-->
<++> P55/EX/PMEU/extract-win.c !e519375d
/***************************************************************************/
/* WinExtract */
/* */
/* Written by Fotonik <fotonik@game-master.com>. */
/* */
/* Coding of WinExtract started on 22aug98. */
/* */
/* This version (1.0) was last modified on 22aug98. */
/* */
/* This is a Win32 program to extract text files from a specially tagged */
/* flat file into a hierarchical directory structure. Use to extract */
/* source code from articles in Phrack Magazine. The latest version of */
/* this program (both source and executable codes) can be found on my */
/* website: http://www.altern.com/fotonik */
/***************************************************************************/
#include <stdio.h>
#include <string.h>
#include <windows.h>
void PowerCreateDirectory(char *DirectoryName);
int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst,
LPSTR lpszArgs, int nWinMode)
{
OPENFILENAME OpenFile; /* Structure for Open common dialog box */
char InFileName[256]="";
char OutFileName[256];
char Title[]="WinExtract - Choose a file to extract files from.";
FILE *InFile;
FILE *OutFile;
char Line[256];
char DirName[256];
int FileExtracted=0; /* Flag used to determine if at least one file was */
int i; /* extracted */
ZeroMemory(&OpenFile, sizeof(OPENFILENAME));
OpenFile.lStructSize=sizeof(OPENFILENAME);
OpenFile.hwndOwner=HWND_DESKTOP;
OpenFile.hInstance=hThisInst;
OpenFile.lpstrFile=InFileName;
OpenFile.nMaxFile=sizeof(InFileName)-1;
OpenFile.lpstrTitle=Title;
OpenFile.Flags=OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
if(GetOpenFileName(&OpenFile))
{
if((InFile=fopen(InFileName,"r"))==NULL)
{
MessageBox(NULL,"Could not open file.",NULL,MB_OK);
return 0;
}
/* If we got here, InFile is opened. */
while(fgets(Line,256,InFile))
{
if(!strncmp(Line,"<++> ",5)) /* If line begins with "<++> " */
{
Line[strlen(Line)-1]='\0';
strcpy(OutFileName,Line+5);
/* Check if a dir has to be created and create one if necessary */
for(i=strlen(OutFileName)-1;i>=0;i--)
{
if((OutFileName[i]=='\\')||(OutFileName[i]=='/'))
{
strncpy(DirName,OutFileName,i);
DirName[i]='\0';
PowerCreateDirectory(DirName);
break;
}
}
if((OutFile=fopen(OutFileName,"w"))==NULL)
{
MessageBox(NULL,"Could not create file.",NULL,MB_OK);
fclose(InFile);
return 0;
}
/* If we got here, OutFile can be written to */
while(fgets(Line,256,InFile))
{
if(strncmp(Line,"<-->",4)) /* If line doesn't begin w/ "<-->" */
{
fputs(Line, OutFile);
}
else
{
break;
}
}
fclose(OutFile);
FileExtracted=1;
}
}
fclose(InFile);
if(FileExtracted)
{
MessageBox(NULL,"Extraction sucessful.","WinExtract",MB_OK);
}
else
{
MessageBox(NULL,"Nothing to extract.","Warning",MB_OK);
}
}
return 1;
}
/* PowerCreateDirectory is a function that creates directories that are */
/* down more than one yet unexisting directory levels. (e.g. c:\1\2\3) */
void PowerCreateDirectory(char *DirectoryName)
{
int i;
int DirNameLength=strlen(DirectoryName);
char DirToBeCreated[256];
for(i=1;i<DirNameLength;i++) /* i starts at 1, because we never need to */
{ /* create '/' */
if((DirectoryName[i]=='\\')||(DirectoryName[i]=='/')||
(i==DirNameLength-1))
{
strncpy(DirToBeCreated,DirectoryName,i+1);
DirToBeCreated[i+1]='\0';
CreateDirectory(DirToBeCreated,NULL);
}
}
}
<-->
----[ EOF
