加密shell程序

Manpage for shc(1)

NAME

     shc - Generic shell script compiler

SYNOPSIS

     shc [ -e date ] [ -m addr ] [ -i iopt ] [ -x cmnd ]

[ -l lopt ] [ -ACDhTv ] -f script

DESCRIPTION

     shc creates a stripped  binary  executable  version  of  the

script specified with -f on the command line.

The binary version will get a .x extension appended and will

usually  be  a  bit  larger  in size than the original ascii

code. Generated C source code is saved in a  file  with  the

extension .x.c

If you supply an expiration date with the -e option the com-

piled  binary  will  refuse to run after the date specified.

The message "Please contact your provider" will be displayed

instead.  This message can be changed with the -m option.

You can compile any kind of shell script, but  you  need  to

supply valid -i, -x and -l options.

The compiled binary will still be  dependent  on  the  shell

specified  in  the  first  line  of  the  shell  code  (i.e.

#!/bin/sh), thus shc does not create completely  independent

binaries.

shc itself is not a compiler such as cc, it  rather  encodes

and encrypts a shell script and generates C source code with

the added expiration capability. It  then  uses  the  system

compiler  to compile a stripped binary which behaves exactly

like the  original  script.  Upon  execution,  the  compiled

binary  will  decrypt and execute the code with the shell -c

option.  Unfortunatelly, it will  not  give  you  any  speed

improvement as a real C program would.

shc's main purpose is to protect  your  shell  scripts  from

modification  or  inspection.  You can use it if you wish to

distribute your scripts but don't want  them  to  be  easily

readable by other people.

OPTIONS

     The command line options are:

-e date

Expiration date in dd/mm/yyyy format [none]

-m message

message to display  upon  expiration  ["Please  contact

your provider"]

-f script_name

File name of the script to compile

-i inline_option

Inline option for the shell interpreter i.e: -e

-x comand

eXec    command,    as    a    printf    format    i.e:

exec(\\'%s\\',@ARGV);

-l last_option

Last shell option i.e: --

-r   Relax security. Make  a  redistributable  binary  which

executes  on different systems running the same operat-

ing system.

-v   Verbose compilation

-D   Switch on debug exec calls

-T   Allow binary to be  traceable  (using  strace,  ptrace,

truss, etc.)

-C   Display license and exit

-A   Display abstract and exit

-h   Display help and exit

ENVIRONMENT VARIABLES

     CC   C compiler command [cc]

CFLAGS

C compiler flags [none]

EXAMPLES

     Compile a script which can be run on other systems with  the

trace option enabled:

example% shc -v -r -T -f myscript

BUGS

     The  maximum  size  of the script that could be executed once com�

piled is limited by the operating system  configuration  parameter

_SC_ARG_MAX (see sysconf(2))

AUTHOR

     Francisco Rosales <[email protected]>

REPORT BUGS TO

     the author.