readmem.py

#! /usr/bin/env python3
import re
import os
pid = int(os.popen("grep -a ^./asmttpd /proc/[0-9]*/cmdline | cut -d/ -f3") .read())
maps_file = open(f'/proc/{pid}/maps', 'r')
mem_file = open(f'/proc/{pid}/mem', 'rb', 0)
output_file = open("self.dump", 'wb')
for line in maps_file.readlines():  # for each mapped region
    m = re.match(r'([0-9A-Fa-f]+)-([0-9A-Fa-f]+) ([-r])', line)
    if m.group(3) == 'r':  # if this is a readable region
        start = int(m.group(1), 16)
        end = int(m.group(2), 16)
        mem_file.seek(start)  # seek to region start
        chunk = mem_file.read(end-start)  # read region contents
        output_file.write(bytes(line, 'utf-8'))
        output_file.write(chunk)  # dump contents to standard output
maps_file.close()
mem_file.close()
output_file.close()