improved testing and connection handling

test/dumb/tcpserver6.cpp

@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+
+#include <arpa/inet.h>
+
+void error(char *msg) {
+    perror(msg);
+    exit(1);
+}
+
+int main(int argc, char *argv[]) {
+    int sockfd, newsockfd, portno;
+    socklen_t clilen;
+    char buffer[256];
+    struct sockaddr_in6 serv_addr, cli_addr;
+    int n;
+    char client_addr_ipv6[100];
+
+    if (argc < 2) {
+        printf("Usage: %s \n", argv[0]);
+        exit(0);
+    }
+
+    printf("\nIPv6 TCP Server Started...\n");
+    
+    //Sockets Layer Call: socket()
+    sockfd = socket(AF_INET6, SOCK_STREAM, 0);
+    if (sockfd < 0)
+        printf("ERROR opening socket");
+
+    bzero((char *) &serv_addr, sizeof(serv_addr));
+    portno = atoi(argv[1]);
+    serv_addr.sin6_flowinfo = 0;
+    serv_addr.sin6_family = AF_INET6;
+    serv_addr.sin6_addr = in6addr_any;
+    serv_addr.sin6_port = htons(portno);
+
+    
+    //Sockets Layer Call: bind()
+    if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
+        printf("ERROR on binding");
+
+    //Sockets Layer Call: listen()
+    listen(sockfd, 5);
+    clilen = sizeof(cli_addr);
+    
+    //Sockets Layer Call: accept()
+    newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
+    if (newsockfd < 0)
+        printf("ERROR on accept");
+
+    //Sockets Layer Call: inet_ntop()
+    inet_ntop(AF_INET6, &(cli_addr.sin6_addr),client_addr_ipv6, 100);
+    printf("Incoming connection from client having IPv6 address: %s\n",client_addr_ipv6);
+
+    memset(buffer,0, 256);
+    
+    //Sockets Layer Call: recv()
+    n = recv(newsockfd, buffer, 255, 0);
+    if (n < 0)
+        printf("ERROR reading from socket");
+
+    printf("Message from client: %s\n", buffer);
+
+    //Sockets Layer Call: send()
+    printf("sending...\n");
+    n = send(newsockfd, "Server got your message", 23+1, 0);
+    if (n < 0)
+        printf("ERROR writing to socket");
+    
+    //Sockets Layer Call: close()
+    close(sockfd);
+    close(newsockfd);
+    
+    return 0;
+}