Extend APRS.IS object to change login string

This patch copies the aprslib.inet IS object's _send_login()
method so we can change the login app identification string.

aprsd/client.py

@@ -2,7 +2,10 @@ import logging
 import select
 import time
 
+import aprsd
 import aprslib
+from aprslib import is_py3
+from aprslib.exceptions import LoginError
 
 LOG = logging.getLogger("APRSD")
 
@@ -120,6 +123,53 @@ class Aprsdis(aprslib.IS):
 
                 yield line
 
+    def _send_login(self):
+        """
+        Sends login string to server
+        """
+        login_str = "user {0} pass {1} vers aprsd {3}{2}\r\n"
+        login_str = login_str.format(
+            self.callsign,
+            self.passwd,
+            (" filter " + self.filter) if self.filter != "" else "",
+            aprsd.__version__,
+        )
+
+        self.logger.info("Sending login information")
+
+        try:
+            self._sendall(login_str)
+            self.sock.settimeout(5)
+            test = self.sock.recv(len(login_str) + 100)
+            if is_py3:
+                test = test.decode("latin-1")
+            test = test.rstrip()
+
+            self.logger.debug("Server: %s", test)
+
+            _, _, callsign, status, _ = test.split(" ", 4)
+
+            if callsign == "":
+                raise LoginError("Server responded with empty callsign???")
+            if callsign != self.callsign:
+                raise LoginError("Server: %s" % test)
+            if status != "verified," and self.passwd != "-1":
+                raise LoginError("Password is incorrect")
+
+            if self.passwd == "-1":
+                self.logger.info("Login successful (receive only)")
+            else:
+                self.logger.info("Login successful")
+
+        except LoginError as e:
+            self.logger.error(str(e))
+            self.close()
+            raise
+        except Exception:
+            self.close()
+            self.logger.error("Failed to login")
+            raise LoginError("Failed to login")
+
 
 def get_client():
     cl = Client()