1 files changed, 249 insertions, 0 deletions
diff --git a/src/server/client_connections.c b/src/server/client_connections.c
new file mode 100644
index 0000000..262d1d9
--- /dev/null
+++ b/src/server/client_connections.c
@@ -0,0 +1,249 @@
+#include <basic/string32.h>
+#include <basic/basic.h>
+#include <messages/messages.h>
+#include <crypto/rsa.h>
+#include <os/os.h>
+#include <server/client_connections.h>
+#include <server/c2s_handler.h>
+#include <server/s2c_sender.h>
+
+#include <pthread.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <sys/epoll.h>
+
+
+
+ClientConnection *
+client_connection_id_to_ptr(ClientConnections *conns, u32 id)
+{
+    ClientConnection *conn = &conns->connections[id];
+    return conn;
+}
+
+
+void
+client_connection_rm(ClientConnections *conns, u32 connection_id)
+{
+    ClientConnection *conn = client_connection_id_to_ptr(conns, connection_id);
+
+    int fd = os_net_secure_stream_get_fd(conn->secure_stream_id);
+    int deleted = epoll_ctl(conns->epoll_fd, EPOLL_CTL_DEL, fd, 0); 
+    if (deleted == -1) {
+        perror("epoll_ctl<del>:");
+    }
+
+    os_net_secure_stream_close(conn->secure_stream_id);
+
+
+    // Todo: use string32_create with a (temporary) arena
+    String32 username;
+    u32 username_codepoints[MESSAGES_MAX_MESSAGE_LEN];
+    for (size_t i = 0; i < conn->username->len; i++) {
+        username_codepoints[i] = conn->username->codepoints[i];
+    }
+    username.len = conn->username->len;
+
+
+    conn->username->len = 0;
+    conns->free_ids[conns->free_id_count++] = connection_id;
+
+
+    if (username.len) {
+        // send user updates
+        // Todo: make proper groups
+        for (size_t i = 0; i < conns->max_connection_count; i++) {
+            ClientConnection *connection = conns->connections + i;
+            if (connection->username->len > 0) {
+                send_s2c_user_update(connection, &username, S2C_USER_UPDATE_OFFLINE);
+            }
+        }
+
+
+        // Todo: string32_printf(...)
+        printf("<");
+        string32_print(&username);
+        printf("> disconnected\n");
+    }
+}
+
+
+u32
+client_connection_add(ClientConnections *conns, u32 secure_stream_id)
+{
+    if (conns->free_id_count == 0) {
+        return CLIENT_CONNECTION_INVALID_ID;
+    }
+    u32 conn_id = conns->free_ids[--conns->free_id_count];
+    ClientConnection *conn = client_connection_id_to_ptr(conns, conn_id);
+    conn->id = conn_id;
+
+
+    struct epoll_event event;
+    event.events = EPOLLIN;
+    event.data.u32 = conn_id;
+
+    int fd = os_net_secure_stream_get_fd(secure_stream_id);
+
+    if (epoll_ctl(conns->epoll_fd, EPOLL_CTL_ADD, fd, &event) == -1) {
+        conns->free_ids[conns->free_id_count++] = conn_id;
+        perror("epoll_ctl<add>:");
+        return false;
+    }
+
+
+    conn->secure_stream_id = secure_stream_id;
+    conn->recv_buff_size_used = 0;
+
+    return conn_id;
+}
+
+
+internal_fn void
+handle_client_event(ClientConnections *conns, struct epoll_event event)
+{
+    u32 conn_id = event.data.u32;
+    ClientConnection *conn = client_connection_id_to_ptr(conns, conn_id);
+
+
+    u32 secure_stream_id = conn->secure_stream_id;
+    OSNetSecureStreamStatus status = os_net_secure_stream_get_status(conn_id);
+    if (status == OS_NET_SECURE_STREAM_ERROR ||
+        status == OS_NET_SECURE_STREAM_DISCONNECTED) {
+        client_connection_rm(conns, conn_id);
+        return;
+    }
+
+
+    int fd = os_net_secure_stream_get_fd(conn->secure_stream_id);
+
+    if (event.events & EPOLLERR) {
+        printf("EPOLLERR occured for client_id = %d, fd = %d\n", conn_id, fd);
+        client_connection_rm(conns, conn_id);
+    }
+    else if (event.events & EPOLLHUP) {
+        printf("EPOLLHUP occured for client_id = %d, fd = %d\n", conn_id, fd);
+        client_connection_rm(conns, conn_id);
+    }
+    else if (event.events & EPOLLIN) {
+        if (!handle_c2s(conns, conn)) {
+            return client_connection_rm(conns, conn_id);
+        }
+    }
+    else {
+        printf("EPOLL??? (%d) occured for client_id = %d, fd = %d\n", event.events, conn_id, fd);
+        client_connection_rm(conns, conn_id);
+    }
+}
+
+
+internal_fn void
+handle_listener_event(ClientConnections *conns, struct epoll_event event)
+{
+    if (event.events & (EPOLLHUP | EPOLLERR)) {
+        printf("listener failed\n");
+        exit(0);
+    }
+    if (event.events & EPOLLIN) {
+        u32 secure_stream_id = os_net_secure_stream_accept(conns->listener_id);
+        if (secure_stream_id == OS_NET_SECURE_STREAM_ID_INVALID) {
+            return;
+        }
+
+        client_connection_add(conns, secure_stream_id);
+    }
+    else {
+        printf("unhandled listener event %d\n", event.events);
+    }
+}
+
+
+void
+client_connections_manage(ClientConnections *conns)
+{
+    struct epoll_event listener_events;
+    listener_events.data.u32 = conns->listener_id;
+    listener_events.events = EPOLLIN;
+    int listener_fd = os_net_secure_stream_get_fd(conns->listener_id);
+    if (epoll_ctl(conns->epoll_fd, EPOLL_CTL_ADD, listener_fd, &listener_events) < 0) {
+        perror("epoll_ctl add for listener fd:");
+        return;
+    }
+
+    for (;;) {
+        struct epoll_event events[conns->max_connection_count];
+        i32 event_count = epoll_wait(conns->epoll_fd, events, ARRAY_COUNT(events), -1);
+        if (event_count < -1) {
+            perror("epoll_wait:");
+            continue;
+        }
+
+        if (event_count > 0) {
+            printf("event.events = %d\n", events[0].events);
+        }
+
+        for (size_t i = 0; i < event_count; i++) {
+            if (events[i].data.u32 == conns->listener_id) {
+                handle_listener_event(conns, events[i]);
+            } else {
+                handle_client_event(conns, events[i]);
+            }
+        }
+    }
+}
+
+
+ClientConnections *
+client_connections_create(Arena *arena, u16 port)
+{
+    u32 max_user_count = MESSAGES_MAX_USER_COUNT;
+    size_t max_username_len = MESSAGES_MAX_USERNAME_LEN;
+
+
+    os_net_secure_streams_init(arena, max_user_count + 1);
+
+
+    ClientConnections *conns = arena_push(arena, sizeof(ClientConnections));
+
+    conns->server_rsa_pri = rsa_create_via_file(arena, "./server_rsa_pri.pem", false);
+
+    conns->listener_id = os_net_secure_stream_listen(port, conns->server_rsa_pri);
+    if (conns->listener_id == OS_NET_SECURE_STREAM_ID_INVALID) {
+        return 0;
+    }
+
+
+    size_t push_size = sizeof(ClientConnection) * max_user_count;
+    conns->max_connection_count = max_user_count;
+    conns->connections = arena_push(arena, push_size);
+
+    ClientConnection *conn = conns->connections;
+    for (size_t i = 0; i < conns->max_connection_count; i++) {
+        conn->secure_stream_id = CLIENT_CONNECTION_INVALID_ID;
+        conn->recv_buff_size_used = 0;
+
+        conn->username = (String32*)conn->username_buff;
+        conn->username->len = 0;
+
+        conn++;
+    }
+
+
+    conns->free_id_count = max_user_count;
+    conns->free_ids = arena_push(arena, max_user_count * sizeof(*conns->free_ids));
+    for (size_t i = 0; i < max_user_count; i++) {
+        conns->free_ids[i] = i;
+    }
+
+
+    conns->epoll_fd = epoll_create(max_user_count);
+    if (conns->epoll_fd < 0) {
+        perror("epoll_create:");
+        return 0;
+    }
+
+    s2c_sender_init(arena);
+
+    return conns;
+}
+