es Reti

Reti/Laboratorio/Lab1/client.c

+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+  char valueToSend[256] = {'\0'};
+  char valueToReceive[256] = {'\0'};
+  printf("-1 per uscire\n");
+  while (valueToSend[0] != '-' && valueToSend[1] != '1') {
+    int simpleSocket = 0;
+    int simplePort = 0;
+    int returnStatus = 0;
+    char buffer[256] = "";
+    struct sockaddr_in simpleServer;
+
+    if (argc != 3) {
+      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);
+    }
+
+    printf("Inserire il valore da voler inviare al server: ");
+    scanf("%s", valueToSend);
+    write(simpleSocket, valueToSend, sizeof(valueToSend));
+    read(simpleSocket, valueToReceive, sizeof(valueToReceive));
+    int returnValue = atoi(valueToReceive);
+    printf("\n\nMAX: %d\n", returnValue);
+    close(simpleSocket);
+  }
+
+  return 0;
+}

Reti/Laboratorio/Lab1/makefile

+all: client server
+
+client: client.c
+	gcc client.c -o client
+
+server: server.c
+	gcc server.c -o server
+
+clean:
+	rm -f client server

Reti/Laboratorio/Lab1/server.c

+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+// const char MESSAGE[] = "Guess who's back!\n";
+
+int main(int argc, char *argv[]) {
+
+  time_t ticks = time(NULL);
+  char MESSAGE[28] = {'\0'};
+  snprintf(MESSAGE, sizeof(MESSAGE), "%.24s\r\n", ctime(&ticks));
+
+  int simpleSocket = 0;
+  int simplePort = 0;
+  int returnStatus = 0;
+  struct sockaddr_in simpleServer;
+
+  if (argc < 1 || argc > 2) {
+    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 */
+  if (argc == 2) {
+    simplePort = atoi(argv[1]);
+    if (simplePort < 10000 || simplePort > 12000) {
+      fprintf(stderr, "Port must be in range [10000, 12000]\n");
+      exit(1);
+    }
+  } else {
+    srand(time(NULL));
+    simplePort = (rand() % 1999) + 10000;
+  }
+
+  /* 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 on port %d!\n", simplePort);
+  } 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);
+  }
+
+  int max = -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));
+
+    // Read message from client
+    char bufferRead[256] = {'\0'};
+    read(simpleChildSocket, bufferRead, sizeof(bufferRead));
+    int valueFromClient = atoi(bufferRead);
+    if (valueFromClient > max) {
+      max = valueFromClient;
+    }
+    printf("New Value: %d | Max Value: %d\n\n", valueFromClient, max);
+    char valueToSend[256] = {'\0'};
+    snprintf(valueToSend, sizeof(valueToSend), "%d", max);
+    write(simpleChildSocket, valueToSend, sizeof(valueToSend));
+
+    close(simpleChildSocket);
+  }
+
+  close(simpleSocket);
+  return 0;
+}