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-rw-r--r--libc-bottom-half/sources/sockopt.c683
1 files changed, 683 insertions, 0 deletions
diff --git a/libc-bottom-half/sources/sockopt.c b/libc-bottom-half/sources/sockopt.c
new file mode 100644
index 0000000..863d115
--- /dev/null
+++ b/libc-bottom-half/sources/sockopt.c
@@ -0,0 +1,683 @@
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+
+#include <wasi/api.h>
+#include <wasi/descriptor_table.h>
+#include <wasi/sockets_utils.h>
+
+const uint64_t NS_PER_S = 1000000000;
+
+int tcp_getsockopt(tcp_socket_t *socket, int level, int optname,
+ void *restrict optval, socklen_t *restrict optlen)
+{
+ int value = 0;
+
+ network_error_code_t error;
+ tcp_borrow_tcp_socket_t socket_borrow =
+ tcp_borrow_tcp_socket(socket->socket);
+
+ switch (level) {
+ case SOL_SOCKET:
+ switch (optname) {
+ case SO_TYPE: {
+ value = SOCK_STREAM;
+ break;
+ }
+ case SO_PROTOCOL: {
+ value = IPPROTO_TCP;
+ break;
+ }
+ case SO_DOMAIN: {
+ value = __wasi_sockets_utils__posix_family(
+ socket->family);
+ break;
+ }
+ case SO_ERROR: {
+ if (socket->state.tag ==
+ TCP_SOCKET_STATE_CONNECT_FAILED) {
+ value = __wasi_sockets_utils__map_error(
+ socket->state.connect_failed.error_code);
+ socket->state.connect_failed.error_code = 0;
+ } else {
+ value = 0;
+ }
+ break;
+ }
+ case SO_ACCEPTCONN: {
+ bool is_listening = socket->state.tag ==
+ TCP_SOCKET_STATE_LISTENING;
+ if (is_listening !=
+ tcp_method_tcp_socket_is_listening(
+ socket_borrow)) { // Sanity check.
+ abort();
+ }
+ value = is_listening;
+ break;
+ }
+ case SO_KEEPALIVE: {
+ bool result;
+ if (!tcp_method_tcp_socket_keep_alive_enabled(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ value = result;
+ break;
+ }
+ case SO_RCVBUF: {
+ uint64_t result;
+ if (!tcp_method_tcp_socket_receive_buffer_size(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ if (result > INT_MAX) {
+ abort();
+ }
+
+ value = result;
+ break;
+ }
+ case SO_SNDBUF: {
+ uint64_t result;
+ if (!tcp_method_tcp_socket_send_buffer_size(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ if (result > INT_MAX) {
+ abort();
+ }
+
+ value = result;
+ break;
+ }
+ case SO_REUSEADDR: {
+ value = socket->fake_reuseaddr;
+ break;
+ }
+ case SO_RCVTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ case SO_SNDTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IP:
+ switch (optname) {
+ case IP_TTL: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV4) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ uint8_t result;
+ if (!tcp_method_tcp_socket_hop_limit(socket_borrow,
+ &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ value = result;
+ break;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IPV6:
+ switch (optname) {
+ case IPV6_UNICAST_HOPS: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV6) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ uint8_t result;
+ if (!tcp_method_tcp_socket_hop_limit(socket_borrow,
+ &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ value = result;
+ break;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_TCP:
+ switch (optname) {
+ case TCP_NODELAY: {
+ value = socket->fake_nodelay;
+ break;
+ }
+ case TCP_KEEPIDLE: {
+ tcp_duration_t result_ns;
+ if (!tcp_method_tcp_socket_keep_alive_idle_time(
+ socket_borrow, &result_ns, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ uint64_t result_s = result_ns / NS_PER_S;
+ if (result_s == 0) {
+ result_s =
+ 1; // Value was rounded down to zero. Round it up instead, because 0 is an invalid value for this socket option.
+ }
+
+ if (result_s > INT_MAX) {
+ abort();
+ }
+
+ value = result_s;
+ break;
+ }
+ case TCP_KEEPINTVL: {
+ tcp_duration_t result_ns;
+ if (!tcp_method_tcp_socket_keep_alive_interval(
+ socket_borrow, &result_ns, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ uint64_t result_s = result_ns / NS_PER_S;
+ if (result_s == 0) {
+ result_s =
+ 1; // Value was rounded down to zero. Round it up instead, because 0 is an invalid value for this socket option.
+ }
+
+ if (result_s > INT_MAX) {
+ abort();
+ }
+
+ value = result_s;
+ break;
+ }
+ case TCP_KEEPCNT: {
+ uint32_t result;
+ if (!tcp_method_tcp_socket_keep_alive_count(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ if (result > INT_MAX) {
+ abort();
+ }
+
+ value = result;
+ break;
+ break;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+
+ // Copy out integer value.
+ memcpy(optval, &value, *optlen < sizeof(int) ? *optlen : sizeof(int));
+ *optlen = sizeof(int);
+ return 0;
+}
+
+int tcp_setsockopt(tcp_socket_t *socket, int level, int optname,
+ const void *optval, socklen_t optlen)
+{
+ int intval = *(int *)optval;
+
+ network_error_code_t error;
+ tcp_borrow_tcp_socket_t socket_borrow =
+ tcp_borrow_tcp_socket(socket->socket);
+
+ switch (level) {
+ case SOL_SOCKET:
+ switch (optname) {
+ case SO_KEEPALIVE: {
+ if (!tcp_method_tcp_socket_set_keep_alive_enabled(
+ socket_borrow, intval != 0, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case SO_RCVBUF: {
+ if (!tcp_method_tcp_socket_set_receive_buffer_size(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case SO_SNDBUF: {
+ if (!tcp_method_tcp_socket_set_send_buffer_size(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case SO_REUSEADDR: {
+ // As of this writing, WASI has no support for changing SO_REUSEADDR
+ // -- it's enabled by default and cannot be disabled. To keep
+ // applications happy, we pretend to support enabling and disabling
+ // it.
+ socket->fake_reuseaddr = (intval != 0);
+ return 0;
+ }
+ case SO_RCVTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ case SO_SNDTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IP:
+ switch (optname) {
+ case IP_TTL: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV4) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ if (intval < 0 || intval > UINT8_MAX) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (!tcp_method_tcp_socket_set_hop_limit(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IPV6:
+ switch (optname) {
+ case IPV6_UNICAST_HOPS: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV6) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ if (intval < 0 || intval > UINT8_MAX) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (!tcp_method_tcp_socket_set_hop_limit(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_TCP:
+ switch (optname) {
+ case TCP_NODELAY: {
+ // At the time of writing, WASI has no support for TCP_NODELAY.
+ // Yet, many applications expect this option to be implemented.
+ // To ensure those applications can run on WASI at all, we fake
+ // support for it by recording the value, but not doing anything
+ // with it.
+ // If/when WASI adds true support, we can remove this workaround
+ // and implement it properly. From the application's perspective
+ // the "worst" thing that can then happen is that it automagically
+ // becomes faster.
+ socket->fake_nodelay = (intval != 0);
+ return 0;
+ }
+ case TCP_KEEPIDLE: {
+ tcp_duration_t duration = intval * NS_PER_S;
+ if (!tcp_method_tcp_socket_set_keep_alive_idle_time(
+ socket_borrow, duration, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case TCP_KEEPINTVL: {
+ tcp_duration_t duration = intval * NS_PER_S;
+ if (!tcp_method_tcp_socket_set_keep_alive_interval(
+ socket_borrow, duration, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case TCP_KEEPCNT: {
+ if (!tcp_method_tcp_socket_set_keep_alive_count(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+}
+
+int udp_getsockopt(udp_socket_t *socket, int level, int optname,
+ void *restrict optval, socklen_t *restrict optlen)
+{
+ int value;
+
+ network_error_code_t error;
+ udp_borrow_udp_socket_t socket_borrow =
+ udp_borrow_udp_socket(socket->socket);
+
+ switch (level) {
+ case SOL_SOCKET:
+ switch (optname) {
+ case SO_TYPE: {
+ value = SOCK_DGRAM;
+ break;
+ }
+ case SO_PROTOCOL: {
+ value = IPPROTO_UDP;
+ break;
+ }
+ case SO_DOMAIN: {
+ value = __wasi_sockets_utils__posix_family(
+ socket->family);
+ break;
+ }
+ case SO_RCVBUF: {
+ uint64_t result;
+ if (!udp_method_udp_socket_receive_buffer_size(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ if (result > INT_MAX) {
+ abort();
+ }
+
+ value = result;
+ break;
+ }
+ case SO_SNDBUF: {
+ uint64_t result;
+ if (!udp_method_udp_socket_send_buffer_size(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ if (result > INT_MAX) {
+ abort();
+ }
+
+ value = result;
+ break;
+ }
+ case SO_RCVTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ case SO_SNDTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IP:
+ switch (optname) {
+ case IP_TTL: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV4) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ uint8_t result;
+ if (!udp_method_udp_socket_unicast_hop_limit(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ value = result;
+ break;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IPV6:
+ switch (optname) {
+ case IPV6_UNICAST_HOPS: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV6) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ uint8_t result;
+ if (!udp_method_udp_socket_unicast_hop_limit(
+ socket_borrow, &result, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ value = result;
+ break;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+
+ // Copy out integer value.
+ memcpy(optval, &value, *optlen < sizeof(int) ? *optlen : sizeof(int));
+ *optlen = sizeof(int);
+ return 0;
+}
+
+int udp_setsockopt(udp_socket_t *socket, int level, int optname,
+ const void *optval, socklen_t optlen)
+{
+ int intval = *(int *)optval;
+
+ network_error_code_t error;
+ udp_borrow_udp_socket_t socket_borrow =
+ udp_borrow_udp_socket(socket->socket);
+
+ switch (level) {
+ case SOL_SOCKET:
+ switch (optname) {
+ case SO_RCVBUF: {
+ if (!udp_method_udp_socket_set_receive_buffer_size(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case SO_SNDBUF: {
+ if (!udp_method_udp_socket_set_send_buffer_size(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ case SO_RCVTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ case SO_SNDTIMEO: // TODO wasi-sockets: emulate in wasi-libc itself
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IP:
+ switch (optname) {
+ case IP_TTL: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV4) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ if (intval < 0 || intval > UINT8_MAX) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (!udp_method_udp_socket_set_unicast_hop_limit(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ case SOL_IPV6:
+ switch (optname) {
+ case IPV6_UNICAST_HOPS: {
+ if (socket->family != NETWORK_IP_ADDRESS_FAMILY_IPV6) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ if (intval < 0 || intval > UINT8_MAX) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (!udp_method_udp_socket_set_unicast_hop_limit(
+ socket_borrow, intval, &error)) {
+ errno = __wasi_sockets_utils__map_error(error);
+ return -1;
+ }
+
+ return 0;
+ }
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+ break;
+
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+}
+
+int getsockopt(int sockfd, int level, int optname, void *restrict optval,
+ socklen_t *restrict optlen)
+{
+ descriptor_table_entry_t *entry;
+ if (!descriptor_table_get_ref(sockfd, &entry)) {
+ errno = EBADF;
+ return -1;
+ }
+
+ if (optval == NULL || optlen == NULL || *optlen < sizeof(int)) {
+ // FYI, the protocol-specific implementations implicitly depend on these checks.
+ errno = EINVAL;
+ return -1;
+ }
+
+ switch (entry->tag) {
+ case DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET:
+ return tcp_getsockopt(&entry->tcp_socket, level, optname,
+ optval, optlen);
+ case DESCRIPTOR_TABLE_ENTRY_UDP_SOCKET:
+ return udp_getsockopt(&entry->udp_socket, level, optname,
+ optval, optlen);
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+}
+
+int setsockopt(int sockfd, int level, int optname, const void *optval,
+ socklen_t optlen)
+{
+ descriptor_table_entry_t *entry;
+ if (!descriptor_table_get_ref(sockfd, &entry)) {
+ errno = EBADF;
+ return -1;
+ }
+
+ if (optval == NULL || optlen < sizeof(int)) {
+ // FYI, the protocol-specific implementations implicitly depend on these checks.
+ errno = EINVAL;
+ return -1;
+ }
+
+ switch (entry->tag) {
+ case DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET:
+ return tcp_setsockopt(&entry->tcp_socket, level, optname,
+ optval, optlen);
+ case DESCRIPTOR_TABLE_ENTRY_UDP_SOCKET:
+ return udp_setsockopt(&entry->udp_socket, level, optname,
+ optval, optlen);
+ default:
+ errno = ENOPROTOOPT;
+ return -1;
+ }
+}
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