ari edelkind - C libraries and programs

C libraries and programs

• structural get_opts - command-line argument parsing library
  
  
• lx_lib - an extended, structural library, allowing for more secure programming practices. Current functionality includes strings, descriptors, and certain list functions.
  
  
• minilib - small library intended to make various functions easier
  
  
• libnaw - network library call wrapper, enabling authentication of individual network connections.
  
  
• slowget - metered load testing program to simulate slow downloads (i.e. from modem users). If you only load test your systems over an ethernet link, you may find this a good idea.
  
  
• fmtlib - shared library that wraps format-based function calls and may be used to locate format string security problems during normal execution.
  
  
• socketwinch - socket redirection program that reads from many sockets and writes to one single socket. Useful for running services that log to unix domain sockets in chroot(2) environments, converting between STREAM and DGRAM styles of sockets, etc.
  
  
• Forthcoming: iomaster (+iomlib) - i/o multiplexing daemon, with associated packet protocol library. While this is intended for use with tape devices, it is being written with extensibility in mind and may find countless more generic uses. Currently, this package is accessible only through privileged CVS.
  
  

small C programs

• pathize.c - compress delimited strings; originally meant for usage with the PATH environment variable to increase performance by eliminating redundancy. Additional functionality includes removing specified string segments.
  
  Requires structural get_opts.
  Compile with:
  

  gcc -o pathize pathize.c -I../get_opts -L../get_opts -lget_opts
  

  
  
• nologin.c - meant to be used for the login shell of users without login shell requirements. Embarrassingly simple.
  
  Requires minilib.
  Compile with:
  

  gcc -o nologin nologin.c -I../minilib -L../minilib -lminilib -static
  

  
  
• dlinfo.c - displays dynamic symbol information. If you would like to use dlinfo to discover information about a library that it's not linked with, add the library to your LD_PRELOAD environment variable.
  Compile with:
  

  gcc -o dlinfo dlinfo.c -D_GNU_SOURCE=1 -ldl
  

  The _GNU_SOURCE macro is only necessary for gnu libc systems, and -ldl is only used on systems that have it. Some systems (netbsd, openbsd) do not support RTLD_NEXT; dlinfo will not work (or compile) on these systems.
  
  
• pwcr.c - a purely brute-force, incremental password cracker. Unless you use a distributed method, incorporating a serious number of machines, this is not a feasible, time-effective method for cracking passwords greater than six characters. On a single machine, cracking an eight-character password will take years. Depending on how many characters you include and the speed of your machine, it may take hundreds of years. But nonetheless, it can help. Includes options to allow the user to begin cracking at a specified password value or a minimum (and/or maximum) password length. The program also displays the current sequence attempted, at intervals, so you may stop the cracker, then let it pick up at a later time where it left off, with minimal overlap.
  
  Requires structural get_opts.
  Compile with:
  

  gcc -o pwcr pwcr.c -I../get_opts -L../get_opts -lget_opts
  

  
  
• swapbits.c - demonstrates one method of swapping every successive pair of bits in a file. Compile with:
  

  gcc -o swapbits swapbits.c
  

  
  
• base64.c - base64-encodes or -decodes a string. It may be used as an object for inclusion with other code, or it can be compiled as a library.
  Compile with:
  

  gcc -c base64.c
  

  
  For use in other programs, you may find base64.h useful.
  
  

Patches