add Reti

Reti/Laboratorio/.gitignore

+*.o

Reti/Laboratorio/myFirstNetworkApp/client.c

+#include <stdio.h>      
+#include <sys/types.h>
+#include <sys/socket.h>   
+#include <netdb.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+int main(int argc, char *argv[]) {
+
+    int simpleSocket = 0;
+    int simplePort = 0;
+    int returnStatus = 0;
+    char buffer[256] = "";
+    struct sockaddr_in simpleServer;
+
+    if (3 != argc) {
+
+        fprintf(stderr, "Usage: %s <server> <port>\n", argv[0]);
+        exit(1);
+
+    }
+
+    /* create a streaming socket      */
+    simpleSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    if (simpleSocket == -1) {
+
+        fprintf(stderr, "Could not create a socket!\n");
+        exit(1);
+
+    }
+    else {
+	    fprintf(stderr, "Socket created!\n");
+    }
+
+    /* retrieve the port number for connecting */
+    simplePort = atoi(argv[2]);
+
+    /* setup the address structure */
+    /* use the IP address sent as an argument for the server address  */
+    //bzero(&simpleServer, sizeof(simpleServer)); 
+    memset(&simpleServer, '\0', sizeof(simpleServer));
+    simpleServer.sin_family = AF_INET;
+    //inet_addr(argv[2], &simpleServer.sin_addr.s_addr);
+    simpleServer.sin_addr.s_addr=inet_addr(argv[1]);
+    simpleServer.sin_port = htons(simplePort);
+
+    /*  connect to the address and port with our socket  */
+    returnStatus = connect(simpleSocket, (struct sockaddr *)&simpleServer, sizeof(simpleServer));
+
+    if (returnStatus == 0) {
+	    fprintf(stderr, "Connect successful!\n");
+    }
+    else {
+        fprintf(stderr, "Could not connect to address!\n");
+	close(simpleSocket);
+	exit(1);
+    }
+
+    /* get the message from the server   */
+    returnStatus = read(simpleSocket, buffer, sizeof(buffer));
+
+    if ( returnStatus > 0 ) {
+        printf("%d: %s", returnStatus, buffer);
+    } else {
+        fprintf(stderr, "Return Status = %d \n", returnStatus);
+    }
+
+    close(simpleSocket);
+    return 0;
+
+}
+

Reti/Laboratorio/myFirstNetworkApp/server.c

+#include <stdio.h>      
+#include <sys/types.h>
+#include <sys/socket.h>   
+#include <netdb.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h> 
+
+const char MESSAGE[] = "Hello UPO student!\n";
+
+int main(int argc, char *argv[]) {
+
+    int simpleSocket = 0;
+    int simplePort = 0;
+    int returnStatus = 0;
+    struct sockaddr_in simpleServer;
+
+    if (2 != argc) {
+
+        fprintf(stderr, "Usage: %s <port>\n", argv[0]);
+        exit(1);
+
+    }
+
+    simpleSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    if (simpleSocket == -1) {
+
+        fprintf(stderr, "Could not create a socket!\n");
+        exit(1);
+
+    }
+    else {
+	    fprintf(stderr, "Socket created!\n");
+    }
+
+    /* retrieve the port number for listening */
+    simplePort = atoi(argv[1]);
+
+    /* setup the address structure */
+    /* use INADDR_ANY to bind to all local addresses  */
+    memset(&simpleServer, '\0', sizeof(simpleServer)); 
+    simpleServer.sin_family = AF_INET;
+    simpleServer.sin_addr.s_addr = htonl(INADDR_ANY);
+    simpleServer.sin_port = htons(simplePort);
+
+    /*  bind to the address and port with our socket  */
+    returnStatus = bind(simpleSocket,(struct sockaddr *)&simpleServer,sizeof(simpleServer));
+
+    if (returnStatus == 0) {
+	    fprintf(stderr, "Bind completed!\n");
+    }
+    else {
+        fprintf(stderr, "Could not bind to address!\n");
+	close(simpleSocket);
+	exit(1);
+    }
+
+    /* lets listen on the socket for connections      */
+    returnStatus = listen(simpleSocket, 5);
+
+    if (returnStatus == -1) {
+        fprintf(stderr, "Cannot listen on socket!\n");
+	close(simpleSocket);
+        exit(1);
+    }
+
+    while (1)
+
+    {
+
+        struct sockaddr_in clientName = { 0 };
+	int simpleChildSocket = 0;
+	int clientNameLength = sizeof(clientName);
+
+	/* wait here */
+
+        simpleChildSocket = accept(simpleSocket,(struct sockaddr *)&clientName, &clientNameLength);
+
+	if (simpleChildSocket == -1) {
+
+            fprintf(stderr, "Cannot accept connections!\n");
+	    close(simpleSocket);
+	    exit(1);
+
+	}
+
+        /* handle the new connection request  */
+	/* write out our message to the client */
+	write(simpleChildSocket, MESSAGE, strlen(MESSAGE));
+        close(simpleChildSocket);
+
+    }
+
+    close(simpleSocket);
+    return 0;
+
+}
+