Implement sock_send_to and sock_recv_from system calls (#1457)

samples/socket-api/wasm-src/socket_utils.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 Amazon.com Inc. or its affiliates. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef TCP_UTILS_H
+#define TCP_UTILS_H
+
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+
+int
+sockaddr_to_string(struct sockaddr *addr, char *str, size_t len)
+{
+    uint16_t port;
+    char ip_string[64];
+    void *addr_buf;
+    int ret;
+
+    switch (addr->sa_family) {
+        case AF_INET:
+        {
+            struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
+            port = addr_in->sin_port;
+            addr_buf = &addr_in->sin_addr;
+            break;
+        }
+        case AF_INET6:
+        {
+            struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
+            port = addr_in6->sin6_port;
+            addr_buf = &addr_in6->sin6_addr;
+            break;
+        }
+        default:
+            return -1;
+    }
+
+    inet_ntop(addr->sa_family, addr_buf, ip_string,
+              sizeof(ip_string) / sizeof(ip_string[0]));
+
+    ret = snprintf(str, len, "%s:%d", ip_string, ntohs(port));
+
+    return ret > 0 && (size_t)ret < len ? 0 : -1;
+}
+
+#endif /* TCP_UTILS_H */