HTTP-ASM64

The most basic HTTP Server written in 64-bit Assembly with NASM Assembler.

Currently it is extremely primitive and is only able to serve a single page, index.html

Learned

• Switching from MASM in Windows to NASM in Linux
• Basics of NASM and 64-bit Assembly
• How to use Linux system calls
• How to use Sockets
• Refresh on Assembly in general
• Basics of MakeFiles

Setup

• Dependencies sudo apt-get -y install nasm build-essential
• Assembling+Linking+Running make build && ./server or ./Run-NASM.sh server.asm
• Listening on http://127.0.0.1:3926

Screenshots

To Do Eventually ... Maybe?

• Refactor duplicate code
• Make Utils.asm and export functions
• Proper 404 message handling
• 404 Error Page
• Multiple file handling for external css,js, more html files, images, etc.
• Proper socket shutdown
• POST method handling

Source Dump

• GNU C Sockets Documentation http://www.delorie.com/gnu/docs/glibc/libc_301.html
• Linux Socket Man Pages http://man7.org/linux/man-pages
• Linux System Calls Reference https://filippo.io/linux-syscall-table/
• Assembly(x86) Cheatsheet https://github.com/cirosantilli/x86-assembly-cheat
• Quick Reference https://www.cs.uaf.edu/2017/fall/cs301/reference/x86_64.html
• Connecting a socket in C http://wiki.linuxquestions.org/wiki/Connecting_a_socket_in_C
• IP to DWORD https://stackoverflow.com/questions/5328070/how-to-convert-string-to-ip-address-and-vice-versa

char strAddr[] = "127.0.0.1"
DWORD ip = inet_addr(strAddr); // ip contains 16777343 [0x0100007f in hex]

struct in_addr paddr;
paddr.S_un.S_addr = ip;

char *strAdd2 = inet_ntoa(paddr); // strAdd2 contains the same string as strAdd

• Converting hex+decimal https://www.scadacore.com/tools/programming-calculators/online-hex-converter/
• System calls for network functionality http://beej.us/net2/html/syscalls.html
• AF_INET https://stackoverflow.com/questions/1593946/what-is-af-inet-and-why-do-i-need-it
• sys_setsockopt() http://pubs.opengroup.org/onlinepubs/009695399/functions/setsockopt.html
• HTTP Messages https://en.wikipedia.org/wiki/HTTP_message_body