skeleton

main.c

@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <err.h>
+#include <netdb.h>
+
+int main(void){
+        struct sockaddr sock;
+        socklen_t slen = sizeof(sock);
+        char host[1024] = "";
+        char port[1044] = "";
+        int status;
+
+        if(getpeername(0, &sock, &slen))
+            err(1, "getpeername");
+
+        status = getnameinfo(&sock, slen, host, sizeof host, port, sizeof port,
+                        NI_NUMERICHOST|NI_NUMERICSERV);
+	if(status > 0)
+	{
+            fprintf(stderr, "getnameinfo error");
+            exit(1);
+	}
+
+        switch(sock. sa_family)
+        {
+            case AF_INET:
+                    printf("%s\n", host);
+                    break;
+            case AF_INET6:
+                    printf("%s\n", host);
+                    break;
+            default:
+                    puts("run from console");
+        }
+}
+