Add script that parses the interesting parts from a wireguard config b/c C string handling is hard

src/readconfig.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+"""Carve the interesting parts out of a wireguard config file and print them to stdout such that it's easier to read them in C"""
+
+import argparse
+
+def is_ip4(string):
+    """Check if the given string is in IPv4 format"""
+    if string.count(".") == 3:
+        for s in string.split("."):
+            try:
+                int(s)
+            except:
+                return False
+        return True
+
+    return False
+
+
+def is_ip6(string):
+    """Check if the given string is in IPv6 format"""
+    if ":" in string:
+        return True
+
+    return False
+
+
+def parse_ips(string):
+    """Parse the IP4s and IP6s out of a comma-separated list of IPs"""
+    ip4 = []
+    ip6 = []
+
+    ips = [s.strip() for s in string.split(",")]
+    for ip in ips:
+        if is_ip4(ip):
+            ip4.append(ip)
+        elif is_ip6(ip):
+            ip6.append(ip)
+
+    return ip4, ip6
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument("config", metavar="CONFIG-FILE", help="The path of the configuration file")
+
+args = parser.parse_args()
+
+with open(args.config, "r") as config_file:
+    lines = config_file.readlines()
+
+    local_section = False
+    for line in lines:
+        line = line.strip()
+
+        if "[Interface]" in line:
+            local_section = True
+
+        if line and not line.startswith("#"):
+            if line.startswith("Address"):
+                # this is the line where the local addresses are defined
+                split = line.split("=")
+                ip4, ip6 = parse_ips(split[1])
+
+                print("IPv4")
+                for ip in ip4:
+                    print(ip)
+                print("IPv6")
+                for ip in ip6:
+                    print(ip)