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#include <errno.h>
#include <netinet/in.h>
#include <wasi/descriptor_table.h>
#include <wasi/sockets_utils.h>
static int tcp_connect(tcp_socket_t *socket, const struct sockaddr *addr,
socklen_t addrlen)
{
network_ip_socket_address_t remote_address;
int parse_err;
if (!__wasi_sockets_utils__parse_address(socket->family, addr, addrlen,
&remote_address, &parse_err)) {
errno = parse_err;
return -1;
}
switch (socket->state.tag) {
case TCP_SOCKET_STATE_UNBOUND:
case TCP_SOCKET_STATE_BOUND:
// These can initiate a connect.
break;
case TCP_SOCKET_STATE_CONNECTING:
errno = EALREADY;
return -1;
case TCP_SOCKET_STATE_CONNECTED:
errno = EISCONN;
return -1;
case TCP_SOCKET_STATE_CONNECT_FAILED: // POSIX: "If connect() fails, the state of the socket is unspecified. Conforming applications should close the file descriptor and create a new socket before attempting to reconnect."
case TCP_SOCKET_STATE_LISTENING:
default:
errno = EOPNOTSUPP;
return -1;
}
network_error_code_t error;
network_borrow_network_t network_borrow =
__wasi_sockets_utils__borrow_network();
tcp_borrow_tcp_socket_t socket_borrow =
tcp_borrow_tcp_socket(socket->socket);
if (!tcp_method_tcp_socket_start_connect(socket_borrow, network_borrow,
&remote_address, &error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
// Connect has successfully started.
socket->state = (tcp_socket_state_t){
.tag = TCP_SOCKET_STATE_CONNECTING,
.connecting = { /* No additional state */ }
};
// Attempt to finish it:
tcp_tuple2_own_input_stream_own_output_stream_t io;
while (!tcp_method_tcp_socket_finish_connect(socket_borrow, &io,
&error)) {
if (error == NETWORK_ERROR_CODE_WOULD_BLOCK) {
if (socket->blocking) {
poll_borrow_pollable_t pollable_borrow =
poll_borrow_pollable(
socket->socket_pollable);
poll_method_pollable_block(pollable_borrow);
} else {
errno = EINPROGRESS;
return -1;
}
} else {
socket->state =
(tcp_socket_state_t){ .tag = TCP_SOCKET_STATE_CONNECT_FAILED,
.connect_failed = {
.error_code =
error,
} };
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
}
// Connect successful.
streams_own_input_stream_t input = io.f0;
streams_borrow_input_stream_t input_borrow =
streams_borrow_input_stream(input);
poll_own_pollable_t input_pollable =
streams_method_input_stream_subscribe(input_borrow);
streams_own_output_stream_t output = io.f1;
streams_borrow_output_stream_t output_borrow =
streams_borrow_output_stream(output);
poll_own_pollable_t output_pollable =
streams_method_output_stream_subscribe(output_borrow);
socket->state =
(tcp_socket_state_t){ .tag = TCP_SOCKET_STATE_CONNECTED,
.connected = {
.input = input,
.input_pollable = input_pollable,
.output = output,
.output_pollable =
output_pollable,
} };
return 0;
}
// When `connect` is called on a UDP socket with an AF_UNSPEC address, it is actually a "disconnect" request.
static int udp_connect(udp_socket_t *socket, const struct sockaddr *addr,
socklen_t addrlen)
{
if (addr == NULL || addrlen < sizeof(struct sockaddr)) {
errno = EINVAL;
return -1;
}
network_ip_socket_address_t remote_address;
bool has_remote_address = (addr->sa_family != AF_UNSPEC);
if (has_remote_address) {
int parse_err;
if (!__wasi_sockets_utils__parse_address(
socket->family, addr, addrlen, &remote_address,
&parse_err)) {
errno = parse_err;
return -1;
}
}
// Prepare the socket; binding it if not bound yet, and disconnecting it if connected.
switch (socket->state.tag) {
case UDP_SOCKET_STATE_UNBOUND: {
// Socket is not explicitly bound by the user. We'll do it for them:
network_ip_socket_address_t any =
__wasi_sockets_utils__any_addr(socket->family);
int result = __wasi_sockets_utils__udp_bind(socket, &any);
if (result != 0) {
return result;
}
break;
}
case UDP_SOCKET_STATE_BOUND_NOSTREAMS: {
// This is the state we want to be in.
break;
}
case UDP_SOCKET_STATE_BOUND_STREAMING: {
__wasi_sockets_utils__drop_streams(
socket->state.bound_streaming.streams);
socket->state = (udp_socket_state_t){
.tag = UDP_SOCKET_STATE_BOUND_NOSTREAMS,
.bound_nostreams = {}
};
break;
}
case UDP_SOCKET_STATE_CONNECTED: {
__wasi_sockets_utils__drop_streams(
socket->state.connected.streams);
socket->state = (udp_socket_state_t){
.tag = UDP_SOCKET_STATE_BOUND_NOSTREAMS,
.bound_nostreams = {}
};
break;
}
default: /* unreachable */
abort();
}
network_error_code_t error;
udp_socket_streams_t streams;
if (!__wasi_sockets_utils__stream(
socket, has_remote_address ? &remote_address : NULL,
&streams, &error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
return 0;
}
int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
{
descriptor_table_entry_t *entry;
if (!descriptor_table_get_ref(fd, &entry)) {
errno = EBADF;
return -1;
}
switch (entry->tag) {
case DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET:
return tcp_connect(&entry->tcp_socket, addr, addrlen);
case DESCRIPTOR_TABLE_ENTRY_UDP_SOCKET:
return udp_connect(&entry->udp_socket, addr, addrlen);
default:
errno = EOPNOTSUPP;
return -1;
}
}
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