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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <cs50.h> | |
| #include <ctype.h> | |
| int main(int argc, char *argv[]) | |
| { | |
| if (argc != 2) | |
| { |
jwieder
/ linked-list.c
Created
December 16, 2014 22:01
Example of linked list creation in C. Note this is merely a struct and function, and does not include a main function or preprocessor imperatives. Used in Harvard's CS50 class.
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| typedef struct node | |
| { | |
| int n; | |
| struct node *next; | |
| } | |
| node; | |
| bool search(int n, node* list) | |
| { | |
| node* ptr = list; |
jwieder
/ dgb_hash.c
Last active
August 29, 2015 14:11
Very simple implementation of a DGB hash function, written in C. Accepts one contiguous string, provided as a command line argument, as input. For example: #./dgb_hash plaintext
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| #include <stdio.h> | |
| #include <string.h> | |
| int main(int argc, char* argv[]) | |
| { | |
| if (argc != 2) | |
| { | |
| printf("\nCorrect usage is: gdb_script plaintext\n"); | |
| return 1; | |
| } |
jwieder
/ readlink.c
Last active
August 29, 2015 14:11
The readlink function gets the value of the symbolic link filename. The file name that the link points to is copied into buffer. This file name string is not null-terminated; readlink normally returns the number of characters copied. The size argument specifies the maximum number of characters to copy, usually the allocation size of buffer.
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| ssize_t readlink (const char *filename, char *buffer, size_t size) | |
| char *readlink_malloc (const char *filename) | |
| { | |
| int size = 100; | |
| char *buffer = NULL; | |
| while (1) | |
| { | |
| buffer = (char *) xrealloc (buffer, size); |
jwieder
/ BootChess.asm
Created
February 2, 2015 01:16
BootChess - a 512 byte x86 boot sector implementation of chess
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| ;----------RED-SECTOR-INC.-proudly-presents-a-33-year-old-record-:---------- | |
| ; 468-byte footprint___ _ "...The original chess game in a bootsector" | |
| ; / / _____ _ _ _____ _ _ ___ _ | |
| ; .::. / / / / / / / / / / | |
| ; :::: / / ____ .-/ _ ___/-. .-/ _ ___/-. / /__ | |
| ; :: / \ | | . | | | . | / / | |
| ; :: __ _ \ l | | | l | | / ___/ | |
| ; .::. / / / / | l |_| l | |__/ / ____ | |
| ; .::::. / __/ `--' `--' / | | |
| ; :::::::: / / | |
jwieder
/ rtf-carv.py
Created
March 31, 2015 01:15
Python script to extract shell code from RTF documents with viral payloads, specifically CVE-2010-3333
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| import sys | |
| from StringIO import StringIO | |
| def parse_rtf(f): | |
| d = f.read() | |
| # \rtf & \shp | |
| if d.find('\x7b\x5c\x72') != -1 and d.find('\x5c\x73\x68\x70') != -1 and d.find('\x5c\x73\x70') != -1: | |
| addr = d.find('\x5c\x73\x76') | |
| if addr != -1: | |
| f.seek(addr) |
jwieder
/ sc-bin.hex
Created
March 31, 2015 01:23
Output of rtf-carver.py used on CVE-2010-3333 exploited RTF file
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| 0000000: 0123 4567 ff03 0000 0000 0000 0000 0000 .#Eg............ | |
| 0000010: 0000 0000 0000 0000 0000 1245 fa7f 0000 ...........E.... | |
| 0000020: 807c 0000 807c bbbb bbbb cccc cccc dddd .|...|.......... | |
| 0000030: dddd 906a 887c 9090 9090 64a1 3000 0000 ...j.|....d.0... | |
| 0000040: 8b40 0c8b 701c ad8b 7008 e9f4 0200 0058 .@..p...p......X | |
| 0000050: 81ec 0003 0000 8bfc 5033 c0b9 0003 0000 ........P3...... | |
| 0000060: f3aa 588b fc89 7708 8947 10ff 7708 68ec ..X...w..G..w.h. | |
| 0000070: 9703 0ce8 7702 0000 8947 1cff 7708 68f6 ....w....G..w.h. | |
| 0000080: 22b9 7ce8 6702 0000 8947 20ff 7708 68a5 ".|.g....G .w.h. | |
| 0000090: 1700 7ce8 5702 0000 8947 24ff 7708 68fb ..|.W....G$.w.h. |
jwieder
/ lib_netaddr.awk
Created
November 4, 2015 15:41
convert massive subnet lists to CIDR very quickly (280K lines ~15 sec) - h/t ripat
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| # | |
| # Library with various ip manipulation functions | |
| # | |
| # convert ip ranges to CIDR notation | |
| # str range2cidr(ip2dec("192.168.0.15"), ip2dec("192.168.5.115")) | |
| # | |
| # Credit to Chubler_XL for this brilliant function. (see his post below for non GNU awk) | |
| # | |
| function range2cidr(ipStart, ipEnd, bits, mask, newip) { |
jwieder
/ CVE-2014-0038.c
Created
February 4, 2016 20:42
CVE-2014-0038 POC script. Used in the Feb 2016 compromise of NASA.
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| #define _GNU_SOURCE | |
| #include <netinet/ip.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <time.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <fcntl.h> | |
| #include <sys/socket.h> | |
| #include <sys/stat.h> |
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| #!/bin/sh | |
| echo '#!/bin/sh' >/var/upgrade/upgrade1.sh | |
| chmod 755 /var/upgrade/upgrade1.sh | |
| KEYGEN=/usr/bin/ssh-keygen | |
| SSHD=/usr/sbin/sshd | |
| RSA1_KEY=/etc/ssh_host_key | |
| RSA_KEY=/etc/ssh_host_rsa_key | |
| DSA_KEY=/etc/ssh_host_dsa_key |
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