-- Leo's gemini proxy
-- Connecting to gemini.dimakrasner.com:1965...
-- Connected
-- Sending request
-- Meta line: 20 text/gemini
I received my Pico W long time ago but couldn't find the time to finish this.
I decided to do this in Python (using MicroPython) first, then translate to C and see how things can be improved.
It's very simple and very basic, without concurrency. Like my ESP32 setup, it uses Duck DNS. The key and the certificate are at /pyboard/{key,cert}.der and this is /pyboard/boot.py:
import ussl
import socket
import network
import _thread
import machine
import urequests
SSID = 'AAA'
PASSPHRASE = 'BBB'
DOMAINS = 'CCC'
TOKEN = 'DDD'
PORT = 1965
keyfile = open("key.der", "rb").read()
certfile = open("cert.der", "rb").read()
def read_request(sc):
buf = sc.read(len('gemini://a'))
while not buf.endswith(b'\r') and len(buf) < 64:
b = sc.read(1)
buf += b
if not buf.endswith(b'\r'):
raise Exception('Truncated request')
url = buf[:-1].decode('utf-8')
_, _, _, path = url.split("/", 3)
path = path.lstrip('/')
print(url)
if len(path) == 0 or path == '/':
path = 'index.gmi'
elif path == 'key.der' or path == 'cert.der' or path == 'main.py':
sc.write(f'40 Forbidden\r\n')
raise Exception(f"Forbidden path: {path}")
return path
def handle_request(c):
try:
sc = ussl.wrap_socket(c, server_side=True, key=keyfile, cert=certfile)
try:
path = read_request(sc)
sc.write(f'20 text/gemini\r\n')
with open(path, "rb") as f:
while True:
chunk = f.read(128)
if len(chunk) == 0:
break
sc.write(chunk)
finally:
sc.close()
finally:
c.close()
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(SSID, PASSPHRASE)
s = socket.socket()
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(('0.0.0.0', PORT))
s.listen(1)
led = machine.Pin('LED', machine.Pin.OUT)
print(f"Local address: {wlan.ifconfig()[0]}")
print('Updating public address')
urequests.get(f"https://www.duckdns.org/update?domains={DOMAINS}&token={TOKEN}")
print('Ready')
while True:
try:
print('Waiting for request')
c, _ = s.accept()
except Exception as e:
print(e)
continue
try:
print('Handling request')
c.settimeout(10)
led.value(1)
try:
handle_request(c)
finally:
led.value(0)
except Exception as e:
print(e)
c.close()
It doesn't send close_notify, something I could fix in my ESP32 Gemini server written in C by forcing mbedtls_ssl_close_notify((mbedtls_ssl_context*)tls), although all other uses of mbedlts are wrapped nicely with the ESP-TLS API. I hope I can do something similar in the Pico without having to patch ussl and rebuild MicroPython.
-- Response ended
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