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Phrack Inc. Volume 08 Issue 52 File 20
---[ Phrack Magazine Volume 8, Issue 52 January 26, 1998, article 20 of 20
-------------------------[ Phrack Magzine Extraction Utility
--------[ Phrack Staff
Added to the list of extraction variants this time is a version in AWK,
and a version in sh. Also, the C version has ben spruced up to accept
file name globs. Keep `em coming...
---------------------8<------------CUT-HERE----------->8---------------------
<++> PEU/extract2.c
/* extract.c by Phrack Staff and sirsyko
*
* (c) Phrack Magazine, 1997
* 1.8.98 rewritten by route:
* - aesthetics
* - now accepts file globs
* todo:
* - more info in tag header (file mode, checksum)
* Extracts textfiles from a specially tagged flatfile into a hierarchical
* directory strcuture. Use to extract source code from any of the articles
* in Phrack Magazine (first appeared in Phrack 50).
*
* gcc -o extract extract.c
*
* ./extract file1 file2 file3 ...
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <string.h>
#include <dirent.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;
};
int
main(int argc, char **argv)
{
u_char b[256], *bp, *fn;
int i, j = 0;
FILE *in_p, *out_p = NULL;
struct f_name *fn_p = NULL, *head = NULL;
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(1);
}
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(1);
}
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(1);
}
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; fn_p = fn_p->next)
{
if (!(in_p = fopen(fn_p->name, "r")))
{
fprintf(stderr, "Could not open input file %s.\n", fn_p->name);
continue;
}
else fprintf(stderr, "Opened %s\n", fn_p->name);
while (fgets(b, 256, in_p))
{
if (!strncmp (b, BEGIN_TAG, BT_SIZE))
{
b[strlen(b) - 1] = 0; /* Now we have a string. */
j++;
if ((bp = strchr(b + BT_SIZE + 1, '/')))
{
while (bp)
{
*bp = 0;
mkdir(b + BT_SIZE, 0700);
*bp = '/';
bp = strchr(bp + 1, '/');
}
}
if ((out_p = fopen(b + BT_SIZE, "w")))
{
printf("- Extracting %s\n", b + BT_SIZE);
}
else
{
printf("Could not extract '%s'.\n", b + BT_SIZE);
continue;
}
}
else if (!strncmp (b, END_TAG, ET_SIZE))
{
if (out_p) fclose(out_p);
else
{
fprintf(stderr, "Error closing file %s.\n", fn_p->name);
continue;
}
}
else if (out_p)
{
fputs(b, out_p);
}
}
}
if (!j) printf("No extraction tags found in list.\n");
else printf("Extracted %d file(s).\n", j);
return (0);
}
/* EOF */
<-->
<++> PEU/extract.pl
# 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 $_};
<-->
<++> PEU/extract.awk
#!/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 }
<-->
<++> PEU/extract.sh
#!/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
)
<-->
----[ EOF
