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#include <sys/socket.h>
#include <errno.h>
#include <wasi/api.h>
#include <wasi/descriptor_table.h>
#include <wasi/sockets_utils.h>
static ssize_t tcp_sendto(tcp_socket_t *socket, const uint8_t *buffer,
size_t length, int flags, const struct sockaddr *addr,
socklen_t addrlen)
{
const int supported_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
if ((flags & supported_flags) != flags) {
errno = EOPNOTSUPP;
return -1;
}
if (addr != NULL || addrlen != 0) {
errno = EISCONN;
return -1;
}
tcp_socket_state_connected_t connection;
if (socket->state.tag == TCP_SOCKET_STATE_CONNECTED) {
connection = socket->state.connected;
} else {
errno = ENOTCONN;
return -1;
}
bool should_block = socket->blocking;
if ((flags & MSG_DONTWAIT) != 0) {
should_block = false;
}
if ((flags & MSG_NOSIGNAL) != 0) {
// Ignore it. WASI has no Unix-style signals. So effectively,
// MSG_NOSIGNAL is always the case, whether it was explicitly
// requested or not.
}
streams_borrow_output_stream_t tx_borrow =
streams_borrow_output_stream(connection.output);
while (true) {
streams_stream_error_t error;
uint64_t count;
if (!streams_method_output_stream_check_write(tx_borrow, &count,
&error)) {
// TODO wasi-sockets: wasi-sockets has no way to recover stream errors yet.
errno = EPIPE;
return -1;
}
if (count) {
count = count < length ? count : length;
wasip2_list_u8_t list = { .ptr = (uint8_t *)buffer,
.len = count };
if (!streams_method_output_stream_write(
tx_borrow, &list, &error)) {
// TODO wasi-sockets: wasi-sockets has no way to recover TCP stream errors yet.
errno = EPIPE;
return -1;
} else {
return count;
}
} else if (should_block) {
poll_borrow_pollable_t pollable_borrow =
poll_borrow_pollable(
connection.output_pollable);
poll_method_pollable_block(pollable_borrow);
} else {
errno = EWOULDBLOCK;
return -1;
}
}
}
static ssize_t udp_sendto(udp_socket_t *socket, const uint8_t *buffer,
size_t length, int flags, const struct sockaddr *addr,
socklen_t addrlen)
{
const int supported_flags = MSG_DONTWAIT;
if ((flags & supported_flags) != flags) {
errno = EOPNOTSUPP;
return -1;
}
network_ip_socket_address_t remote_address;
bool has_remote_address = (addr != NULL);
if (has_remote_address) {
if (socket->state.tag == UDP_SOCKET_STATE_CONNECTED) {
errno = EISCONN;
return -1;
}
int parse_err;
if (!__wasi_sockets_utils__parse_address(
socket->family, addr, addrlen, &remote_address,
&parse_err)) {
errno = parse_err;
return -1;
}
} else {
if (addrlen != 0) {
errno = EINVAL;
return -1;
}
if (socket->state.tag != UDP_SOCKET_STATE_CONNECTED) {
errno = EDESTADDRREQ;
return -1;
}
}
network_error_code_t error;
udp_borrow_udp_socket_t socket_borrow =
udp_borrow_udp_socket(socket->socket);
udp_socket_streams_t streams;
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;
}
if (!__wasi_sockets_utils__stream(socket, NULL, &streams,
&error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
break;
}
case UDP_SOCKET_STATE_BOUND_NOSTREAMS: {
if (!__wasi_sockets_utils__stream(socket, NULL, &streams,
&error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
break;
}
case UDP_SOCKET_STATE_BOUND_STREAMING:
streams = socket->state.bound_streaming.streams;
break;
case UDP_SOCKET_STATE_CONNECTED:
streams = socket->state.connected.streams;
break;
default: /* unreachable */
abort();
}
bool should_block = socket->blocking;
if ((flags & MSG_DONTWAIT) != 0) {
should_block = false;
}
udp_outgoing_datagram_t datagrams[1] = {{
.remote_address = {
.is_some = has_remote_address,
.val = remote_address,
},
.data = {
.len = length,
.ptr = (uint8_t*)buffer,
},
}};
udp_list_outgoing_datagram_t list = {
.len = 1,
.ptr = datagrams,
};
udp_borrow_outgoing_datagram_stream_t outgoing_borrow =
udp_borrow_outgoing_datagram_stream(streams.outgoing);
while (true) {
uint64_t allowed;
if (!udp_method_outgoing_datagram_stream_check_send(
outgoing_borrow, &allowed, &error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
if (allowed) {
uint64_t datagrams_sent;
if (!udp_method_outgoing_datagram_stream_send(
outgoing_borrow, &list, &datagrams_sent,
&error)) {
errno = __wasi_sockets_utils__map_error(error);
return -1;
}
if (datagrams_sent != 0 && datagrams_sent != 1) {
abort();
}
if (datagrams_sent == 1) {
return length;
}
}
if (should_block) {
poll_borrow_pollable_t pollable_borrow =
poll_borrow_pollable(streams.outgoing_pollable);
poll_method_pollable_block(pollable_borrow);
} else {
errno = EWOULDBLOCK;
return -1;
}
}
}
ssize_t send(int socket, const void *buffer, size_t length, int flags)
{
return sendto(socket, buffer, length, flags, NULL, 0);
}
ssize_t sendto(int socket, const void *buffer, size_t length, int flags,
const struct sockaddr *addr, socklen_t addrlen)
{
descriptor_table_entry_t *entry;
if (!descriptor_table_get_ref(socket, &entry)) {
errno = EBADF;
return -1;
}
if (buffer == NULL) {
errno = EINVAL;
return -1;
}
switch (entry->tag) {
case DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET:
return tcp_sendto(&entry->tcp_socket, buffer, length, flags,
addr, addrlen);
case DESCRIPTOR_TABLE_ENTRY_UDP_SOCKET:
return udp_sendto(&entry->udp_socket, buffer, length, flags,
addr, addrlen);
default:
errno = EOPNOTSUPP;
return -1;
}
}
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