From f2489c89e95c07495768b5401b63ba31ec39d72d Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Mon, 22 Jun 2020 11:29:11 +0200
Subject: Move local handling from server to proxy

---
 proxy.c | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 156 insertions(+), 10 deletions(-)

(limited to 'proxy.c')

diff --git a/proxy.c b/proxy.c
index 28a207d..7edfffd 100644
--- a/proxy.c
+++ b/proxy.c
@@ -1,5 +1,9 @@
 #include <stdio.h>
+#include <unistd.h>
 #include <time.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
 
 #include "main.h"
 #include "uring.h"
@@ -7,16 +11,6 @@
 #include "proxy.h"
 #include "utils.h"
 
-void
-proxy_refdump(struct server_proxy *proxy)
-{
-	assert_return(proxy);
-
-	uring_task_refdump(&proxy->task);
-	uring_task_refdump(&proxy->clienttask);
-	uring_task_refdump(&proxy->servertask);
-}
-
 static void
 format_bytes(char *buf, size_t len, uint64_t val)
 {
@@ -239,6 +233,16 @@ proxy_connected_cb(struct connection *conn, bool connected)
 	uring_tbuf_read(&proxy->servertask, proxy_server_data_in);
 }
 
+void
+proxy_refdump(struct server_proxy *proxy)
+{
+	assert_return(proxy);
+
+	uring_task_refdump(&proxy->task);
+	uring_task_refdump(&proxy->clienttask);
+	uring_task_refdump(&proxy->servertask);
+}
+
 struct server_proxy *
 proxy_new(struct server *server, struct saddr *client, int fd)
 {
@@ -276,3 +280,145 @@ proxy_new(struct server *server, struct saddr *client, int fd)
 	return proxy;
 }
 
+static void
+local_accept(struct uring_task *task, int res)
+{
+	struct server_local *local = container_of(task, struct server_local, task);
+	struct server *server = container_of(task->parent, struct server, task);
+	struct server_proxy *proxy;
+
+	assert_return(task);
+	assert_task_alive(DBG_PROXY, task);
+
+	debug(DBG_PROXY, "task %p, res %i, server %s", task, res, server->name);
+
+	if (res < 0) {
+		error("result was %i", res);
+		goto out;
+	}
+
+	saddr_set_addrstr(&local->client);
+
+	verbose("%s: incoming proxy connection: %s -> %s",
+		server->name, local->client.addrstr, local->local.addrstr);
+
+	if (list_empty(&server->remotes)) {
+		/* This shouldn't be possible, checked before opening local */
+		error("server->remotes empty!");
+		uring_close(&local->task, res);
+		goto out;
+	}
+
+	proxy = proxy_new(server, &local->client, res);
+	if (!proxy)
+		uring_close(&local->task, res);
+
+out:
+	uring_accept(&local->task, &local->client, local_accept);
+}
+
+bool
+local_open(struct server_local *local)
+{
+	int sfd;
+	int option;
+	int r;
+
+	assert_return(local && local->server, false);
+
+	sfd = socket(local->local.storage.ss_family, SOCK_STREAM | SOCK_CLOEXEC, 0);
+	if (sfd < 0) {
+		error("socket: %m");
+		goto error;
+	}
+
+	option = true;
+	if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)) < 0) {
+		error("setsockopt: %m");
+		goto error;
+	}
+
+	/* The MC protocol expects the client to send data first */
+	/* FIXME: could make this configurable */
+	option = true;
+	if (setsockopt(sfd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &option, sizeof(option)) < 0)
+		error("setsockopt: %m");
+
+	/* FIXME: could make this configurable */
+	option = true;
+	if (setsockopt(sfd, IPPROTO_IP, IP_FREEBIND, &option, sizeof(option)) < 0)
+		error("setsockopt: %m");
+
+	socket_set_low_latency(sfd);
+
+	r = bind(sfd, (struct sockaddr *)&local->local.storage, local->local.addrlen);
+	if (r < 0) {
+		error("bind: %m");
+		goto error;
+	}
+
+	r = listen(sfd, 100);
+	if (r < 0) {
+		error("listen: %m");
+		goto error;
+	}
+
+	uring_task_set_fd(&local->task, sfd);
+	uring_accept(&local->task, &local->client, local_accept);
+	return true;
+
+error:
+	if (sfd >= 0)
+		uring_close(&local->task, sfd);
+	return false;
+}
+
+void
+local_refdump(struct server_local *local)
+{
+	assert_return(local);
+
+	uring_task_refdump(&local->task);
+}
+
+static void
+local_free(struct uring_task *task)
+{
+	struct server_local *local = container_of(task, struct server_local, task);
+
+	assert_return(task);
+
+	debug(DBG_PROXY, "task %p, local %p", task, local);
+	list_del(&local->list);
+	xfree(local);
+}
+
+void
+local_delete(struct server_local *local)
+{
+	assert_return(local);
+
+	uring_task_destroy(&local->task);
+}
+
+struct server_local *
+local_new(struct server *server, struct saddr *saddr)
+{
+	struct server_local *local;
+
+	assert_return(server && saddr, NULL);
+
+	local = zmalloc(sizeof(*local));
+	if (!local) {
+		error("malloc: %m");
+		return NULL;
+	}
+
+	debug(DBG_PROXY, "%s adding local: %s", server->name, saddr->addrstr);
+	local->local = *saddr;
+	local->server = server;
+	uring_task_init(&local->task, "local", &server->task, local_free);
+	xfree(saddr);
+	return local;
+}
+
-- 
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