Feature/mbedtls (#84)

* try to import mbedtls and build it

* add stubs socket class

* some boilterplate, read and write function implemented

* more boilterplate / current error in handshake because no CA cert is setup

* add something so skip ca verification, can ws curl https://google.com !

* cleanup / close implemented

* tweak CMakefiles

* typo in include

* update readme

* disable unittests

third_party/mbedtls/programs/test/udp_proxy_wrapper.sh

@@ -0,0 +1,117 @@
+#!/bin/sh
+# -*-sh-basic-offset: 4-*-
+# Usage: udp_proxy_wrapper.sh [PROXY_PARAM...] -- [SERVER_PARAM...]
+
+set -u
+
+MBEDTLS_BASE="$(dirname -- "$0")/../.."
+TPXY_BIN="$MBEDTLS_BASE/programs/test/udp_proxy"
+SRV_BIN="$MBEDTLS_BASE/programs/ssl/ssl_server2"
+
+: ${VERBOSE:=0}
+
+stop_proxy() {
+    if [ -n "${tpxy_pid:-}" ]; then
+        echo
+        echo "  * Killing proxy (pid $tpxy_pid) ..."
+        kill $tpxy_pid
+    fi
+}
+
+stop_server() {
+    if [ -n "${srv_pid:-}" ]; then
+        echo
+        echo "  * Killing server (pid $srv_pid) ..."
+        kill $srv_pid >/dev/null 2>/dev/null
+    fi
+}
+
+cleanup() {
+    stop_server
+    stop_proxy
+    exit 129
+}
+
+trap cleanup INT TERM HUP
+
+# Extract the proxy parameters
+tpxy_cmd_snippet='"$TPXY_BIN"'
+while [ $# -ne 0 ] && [ "$1" != "--" ]; do
+    tail="$1" quoted=""
+    while [ -n "$tail" ]; do
+        case "$tail" in
+            *\'*) quoted="${quoted}${tail%%\'*}'\\''" tail="${tail#*\'}";;
+            *) quoted="${quoted}${tail}"; tail=; false;;
+        esac
+    done
+    tpxy_cmd_snippet="$tpxy_cmd_snippet '$quoted'"
+    shift
+done
+unset tail quoted
+if [ $# -eq 0 ]; then
+    echo "  * No server arguments (must be preceded by \" -- \") - exit"
+    exit 3
+fi
+shift
+
+dtls_enabled=
+ipv6_in_use=
+server_port_orig=
+server_addr_orig=
+for param; do
+    case "$param" in
+        server_port=*) server_port_orig="${param#*=}";;
+        server_addr=*:*) server_addr_orig="${param#*=}"; ipv6_in_use=1;;
+        server_addr=*) server_addr_orig="${param#*=}";;
+        dtls=[!0]*) dtls_enabled=1;;
+    esac
+done
+
+if [ -z "$dtls_enabled" ] || [ -n "$ipv6_in_use" ]; then
+    echo >&2 "$0: Couldn't find DTLS enabling, or IPv6 is in use - immediate fallback to server application..."
+    if [ $VERBOSE -gt 0 ]; then
+        echo "[ $SRV_BIN $* ]"
+    fi
+    exec "$SRV_BIN" "$@"
+fi
+
+if [ -z "$server_port_orig" ]; then
+    server_port_orig=4433
+fi
+echo "  * Server port:       $server_port_orig"
+tpxy_cmd_snippet="$tpxy_cmd_snippet \"listen_port=\$server_port_orig\""
+tpxy_cmd_snippet="$tpxy_cmd_snippet \"server_port=\$server_port\""
+
+if [ -n "$server_addr_orig" ]; then
+    echo "  * Server address:    $server_addr_orig"
+    tpxy_cmd_snippet="$tpxy_cmd_snippet \"server_addr=\$server_addr_orig\""
+    tpxy_cmd_snippet="$tpxy_cmd_snippet \"listen_addr=\$server_addr_orig\""
+fi
+
+server_port=$(( server_port_orig + 1 ))
+set -- "$@" "server_port=$server_port"
+echo "  * Intermediate port: $server_port"
+
+echo "  * Start proxy in background ..."
+if [ $VERBOSE -gt 0 ]; then
+    echo "[ $tpxy_cmd_snippet ]"
+fi
+eval exec "$tpxy_cmd_snippet" >/dev/null 2>&1 &
+tpxy_pid=$!
+
+if [ $VERBOSE -gt 0 ]; then
+    echo "  * Proxy ID:          $TPXY_PID"
+fi
+
+echo "  * Starting server ..."
+if [ $VERBOSE -gt 0 ]; then
+    echo "[ $SRV_BIN $* ]"
+fi
+
+exec "$SRV_BIN" "$@" >&2 &
+srv_pid=$!
+
+wait $srv_pid
+
+stop_proxy
+return 0