/**
* Opens the socket server for communication.
* @param transport Transport handle
* @param host Hostname or IP address (using local address if NULL)
* @param port Port number for listen port
* @return Returns LWPB_ERR_OK if successful.
*/
lwpb_err_t lwpb_transport_socket_server_open(lwpb_transport_t transport,
const char *host, u16_t port)
{
struct lwpb_transport_socket_server *socket_server =
(struct lwpb_transport_socket_server *) transport;
lwpb_err_t ret = LWPB_ERR_OK;
int status;
struct addrinfo hints;
struct addrinfo *res;
struct sockaddr_in *addr;
char tmp[16];
int yes = 1;
if (socket_server->socket != -1) {
LWPB_INFO("Socket server already opened");
return LWPB_ERR_OK;
}
// Resolve hostname
LWPB_DEBUG("Resolving hostname '%s'", host);
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET; // IPv4
hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
hints.ai_flags = AI_PASSIVE; // Fill in the IP
snprintf(tmp, sizeof(tmp), "%d", port);
if ((status = getaddrinfo(host, tmp, &hints, &res)) != 0) {
LWPB_ERR("getaddrinfo error: %s\n", gai_strerror(status));
ret = LWPB_ERR_NET_INIT;
goto out;
}
addr = (struct sockaddr_in *) res->ai_addr;
inet_ntop(res->ai_family, &addr->sin_addr, tmp, sizeof(tmp));
// Create server socket
LWPB_DEBUG("Creating server socket");
socket_server->socket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (socket_server->socket == -1) {
LWPB_ERR("Cannot create server socket");
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Reuse address if necessary
if (setsockopt(socket_server->socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
LWPB_ERR("Cannot set SO_REUSEADDR (error: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Make non-blocking
make_nonblock(socket_server->socket);
// Bind listen socket
LWPB_DEBUG("Binding server socket to %s:%d", tmp, port);
if (bind(socket_server->socket, res->ai_addr, res->ai_addrlen) == -1) {
LWPB_ERR("Cannot bind server socket (errno: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Start listening
LWPB_DEBUG("Start listening on server socket");
if (listen(socket_server->socket, LWPB_TRANSPORT_SOCKET_SERVER_CONNS) == -1) {
LWPB_ERR("Cannot listen on server socket (errno: %d)", errno);
close(socket_server->socket);
ret = LWPB_ERR_NET_INIT;
goto out;
}
out:
freeaddrinfo(res);
return ret;
}
/**
* Opens the socket client for communication.
* @param transport Transport handle
* @param host Hostname or IP address (using local address if NULL)
* @param port Port number for listen port
* @return Returns LWPB_ERR_OK if successful.
*/
lwpb_err_t lwpb_transport_socket_client_open(lwpb_transport_t transport,
const char *host, u16_t port)
{
struct lwpb_transport_socket_client *socket_client =
(struct lwpb_transport_socket_client *) transport;
lwpb_err_t ret = LWPB_ERR_OK;
int status;
struct addrinfo hints;
struct addrinfo *res;
struct sockaddr_in *addr;
char tmp[16];
int yes = 1;
if (socket_client->socket != -1) {
LWPB_INFO("Socket client already opened");
return LWPB_ERR_OK;
}
// Allocate receive buffer
ret = lwpb_transport_alloc_buf(&socket_client->super,
&socket_client->buf, &socket_client->len);
if (ret != LWPB_ERR_OK)
return ret;
socket_client->pos = socket_client->buf;
// Resolve hostname
LWPB_DEBUG("Resolving hostname '%s'", host);
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET; // IPv4
hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
hints.ai_flags = AI_PASSIVE; // Fill in the IP
snprintf(tmp, sizeof(tmp), "%d", port);
if ((status = getaddrinfo(host, tmp, &hints, &res)) != 0) {
LWPB_ERR("getaddrinfo error: %s\n", gai_strerror(status));
ret = LWPB_ERR_NET_INIT;
goto out;
}
addr = (struct sockaddr_in *) res->ai_addr;
inet_ntop(res->ai_family, &addr->sin_addr, tmp, sizeof(tmp));
// Create client socket
LWPB_DEBUG("Creating client socket");
socket_client->socket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (socket_client->socket == -1) {
LWPB_ERR("Cannot create client socket");
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Reuse address if necessary
if (setsockopt(socket_client->socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
LWPB_ERR("Cannot set SO_REUSEADDR (error: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Connect to server
LWPB_DEBUG("Connecting to %s:%d", tmp, port);
if (connect(socket_client->socket, res->ai_addr, res->ai_addrlen) == -1) {
LWPB_ERR("Cannot open connection (errno: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Make non-blocking
make_nonblock(socket_client->socket);
out:
freeaddrinfo(res);
return ret;
}
