static int
s_agent_handle_control (agent_t *self)
{
// Get the whole message off the control socket in one go
zmsg_t *request = zmsg_recv (self->control);
char *command = zmsg_popstr (request);
if (!command)
return -1; // Interrupted
if (streq (command, "SET")) {
char *name = zmsg_popstr (request);
char *value = zmsg_popstr (request);
curve_codec_set_metadata (self->codec, name, value);
free (name);
free (value);
}
else
if (streq (command, "CONNECT")) {
assert (!self->endpoint);
self->endpoint = zmsg_popstr (request);
int rc = zsocket_connect (self->dealer, "%s", self->endpoint);
assert (rc != -1);
zframe_t *server_key = zmsg_pop (request);
zframe_t *output = curve_codec_execute (self->codec, &server_key);
zframe_send (&output, self->dealer, 0);
self->state = connecting;
}
else
if (streq (command, "DISCONNECT")) {
if (self->endpoint) {
int rc = zsocket_disconnect (self->dealer, "%s", self->endpoint);
assert (rc != -1);
free (self->endpoint);
}
}
else
if (streq (command, "VERBOSE")) {
char *verbose = zmsg_popstr (request);
curve_codec_set_verbose (self->codec, *verbose == '1');
free (verbose);
}
else
if (streq (command, "TERMINATE")) {
self->state = terminated;
zstr_send (self->control, "OK");
}
else {
puts ("E: invalid command from API");
assert (false);
}
free (command);
zmsg_destroy (&request);
return 0;
}
static int
s_agent_handle_router (agent_t *self)
{
zframe_t *address = zframe_recv (self->router);
char *hashkey = zframe_strhex (address);
client_t *client = (client_t *) zhash_lookup (self->clients, hashkey);
if (client == NULL
&& self->nbr_pending < self->max_pending) {
client = client_new (self, address);
client_set_pending (client);
curve_codec_set_verbose (client->codec, self->verbose);
zhash_foreach (self->metadata, client_set_metadata, client);
zhash_insert (self->clients, hashkey, client);
zhash_freefn (self->clients, hashkey, client_free);
}
free (hashkey);
zframe_destroy (&address);
// If we're overloaded, discard client request without any further
// ado. The client will have to detect this and retry later.
// TODO: retry in client side to handle overloaded servers.
if (client == NULL)
return 0;
// If not yet connected, process one command frame
// We always read one request, and send one reply
if (client->state == pending) {
zframe_t *input = zframe_recv (self->router);
zframe_t *output = curve_codec_execute (client->codec, &input);
if (output) {
zframe_send (&client->address, self->router, ZFRAME_MORE + ZFRAME_REUSE);
zframe_send (&output, self->router, 0);
if (curve_codec_connected (client->codec))
client_set_connected (client);
}
else
client_set_exception (client);
}
else
// If connected, process one message frame
// We will queue message frames in the client until we get a
// whole message ready to deliver up the data socket -- frames
// from different clients will be randomly intermixed.
if (client->state == connected) {
zframe_t *encrypted = zframe_recv (self->router);
zframe_t *cleartext = curve_codec_decode (client->codec, &encrypted);
if (cleartext) {
if (client->incoming == NULL)
client->incoming = zmsg_new ();
zmsg_add (client->incoming, cleartext);
if (!zframe_more (cleartext)) {
zmsg_pushstr (client->incoming, client->hashkey);
zmsg_send (&client->incoming, self->data);
}
}
else
client_set_exception (client);
}
// If client is misbehaving, remove it
if (client->state == exception)
zhash_delete (self->clients, client->hashkey);
return 0;
}
static void *
server_task (void *args)
{
bool verbose = *((bool *) args);
// Install the authenticator
zctx_t *ctx = zctx_new ();
zauth_t *auth = zauth_new (ctx);
assert (auth);
zauth_set_verbose (auth, verbose);
zauth_configure_curve (auth, "*", TESTDIR);
void *router = zsocket_new (ctx, ZMQ_ROUTER);
int rc = zsocket_bind (router, "tcp://127.0.0.1:9005");
assert (rc != -1);
zcert_t *server_cert = zcert_load (TESTDIR "/server.cert");
assert (server_cert);
curve_codec_t *server = curve_codec_new_server (server_cert, ctx);
assert (server);
zcert_destroy (&server_cert);
curve_codec_set_verbose (server, verbose);
// Set some metadata properties
curve_codec_set_metadata (server, "Server", "CURVEZMQ/curve_codec");
// Execute incoming frames until ready or exception
// In practice we'd want a server instance per unique client
while (!curve_codec_connected (server)) {
zframe_t *sender = zframe_recv (router);
zframe_t *input = zframe_recv (router);
assert (input);
zframe_t *output = curve_codec_execute (server, &input);
assert (output);
zframe_send (&sender, router, ZFRAME_MORE);
zframe_send (&output, router, 0);
}
// Check client metadata
char *client_name = (char *) zhash_lookup (curve_codec_metadata (server), "client");
assert (client_name);
assert (streq (client_name, "CURVEZMQ/curve_client"));
bool finished = false;
while (!finished) {
// Now act as echo service doing a full decode and encode
zframe_t *sender = zframe_recv (router);
zframe_t *encrypted = zframe_recv (router);
assert (encrypted);
zframe_t *cleartext = curve_codec_decode (server, &encrypted);
assert (cleartext);
if (memcmp (cleartext, "END", 3) == 0)
finished = true;
// Echo message back
encrypted = curve_codec_encode (server, &cleartext);
assert (encrypted);
zframe_send (&sender, router, ZFRAME_MORE);
zframe_send (&encrypted, router, 0);
}
curve_codec_destroy (&server);
zauth_destroy (&auth);
zctx_destroy (&ctx);
return NULL;
}