Andrés J. Díaz
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▄▄▄▄▄▄▄▄▄▄ ▄▄▄▄▄▄▄▄▄▄▄ ▄▄▄▄▄▄▄▄▄▄▄ ▄ ▄ ▄▄▄▄▄▄▄▄▄▄▄ ▐░░░░░░░░░░▌ ▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░▌ ▐░▌▐░░░░░░░░░░░▌ ▐░█▀▀▀▀▀▀▀█░▌▐░█▀▀▀▀▀▀▀█░▌▐░█▀▀▀▀▀▀▀▀▀ ▐░▌ ▐░▌▐░█▀▀▀▀▀▀▀▀▀ ▐░▌ ▐░▌▐░▌ ▐░▌▐░▌ ▐░▌ ▐░▌▐░▌ ▐░█▄▄▄▄▄▄▄█░▌▐░█▄▄▄▄▄▄▄█░▌▐░█▄▄▄▄▄▄▄▄▄ ▐░█▄▄▄▄▄▄▄█░▌▐░▌ ▐░░░░░░░░░░▌ ▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░▌ ▐░█▀▀▀▀▀▀▀█░▌▐░█▀▀▀▀▀▀▀█░▌ ▀▀▀▀▀▀▀▀▀█░▌▐░█▀▀▀▀▀▀▀█░▌▐░▌ ▐░▌ ▐░▌▐░▌ ▐░▌ ▐░▌▐░▌ ▐░▌▐░▌ ▐░█▄▄▄▄▄▄▄█░▌▐░▌ ▐░▌ ▄▄▄▄▄▄▄▄▄█░▌▐░▌ ▐░▌▐░█▄▄▄▄▄▄▄▄▄ ▐░░░░░░░░░░▌ ▐░▌ ▐░▌▐░░░░░░░░░░░▌▐░▌ ▐░▌▐░░░░░░░░░░░▌ ▀▀▀▀▀▀▀▀▀▀ ▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀ ▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀ BashC is a tool which get your bash script and produces an static linked binary for Linux x86 and x86_64 machines (also support ARM and many other OS, but I cannot test them yet) which runs your script. For example: $ cat > myscript.sh << EOF #!/bin/bash echo "This is a test EOF $ bashc myscript.sh myscript.bin $ file myscript.bin bashc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped $ ./myscript.bin This is a test Nice eh! ---- Installation -------------------------------------------------------- From source code just run: make Easy :) ---- Internals ---------------------------------------------------------- This application is based on previous work from Robert Xu¹, which uses musl instead of glibc avoiding calls to dlopen(3) to produce a static binary. I added some patches (in patch/ directory) to convert the bash binary in a compiler tool. The patch does the following: 1. Read he filesize of itself and jump (lseek) to the last byte of the binary. 2. There read -20 chars as decimal number which represents the length of the script to be executed 3. Jump again (lseek) to END - length readed in (2) 4. Bash interpret the code in current fd position. That is how bashc runs a script. To create the binary just concatenate to the static patched bash, the script to run. Because of ELF header (and in theory also Match) ensure us that execution will never reads after lenght scecified in ELF header, then our script still safe after that position. During the execution the algorithm explained above is running and the script is interpreted. ¹ https://github.com/robxu9/bash-static ---- Limitations -------------------------------------------------------- * Not tested in any other platform than Linux X86 and X86_64. * The bash script code is concatenated in plain text, so no security here. * We cannot use any external dependency for the script unless it was previously compiled as builtin.
The source code of the project is managed by git, you can clone it in the usual way:
git clone https://git.ajdiaz.me/bashc
A mirror in github is also available, but keep in mind that could be out of date.
If you find any error in the code or incorrect behaviour, please do not hesitate to report it in the devel mailing list: email@example.com.
Please note that you need to subscribe to the list prior to post to avoid spam, just send an empty email to firstname.lastname@example.org with the text subscribe bashc-devel in the subject.
Please submit the patches via mailing list. You can read how to in this email + git guide
Any suggestion, discussion or improvement are welcome, just mail to the list!
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. <one line to give the program's name and a brief idea of what it does.> Copyright (C) <year> <name of author> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: <program> Copyright (C) <year> <name of author> This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <https://www.gnu.org/licenses/>. The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <https://www.gnu.org/licenses/why-not-lgpl.html>.