From 5f30f9b03e1b23ac97e865c9fe6e6a85e63c573a Mon Sep 17 00:00:00 2001
From: Gianluca <gianlucamastrolonardo10@gmail.com>
Date: Sat, 20 Apr 2024 14:43:18 +0200
Subject: [PATCH] add Reti
---
Reti/Laboratorio/.gitignore | 1 +
Reti/Laboratorio/myFirstNetworkApp/client.c | 75 ++++++++++++++++
Reti/Laboratorio/myFirstNetworkApp/server.c | 99 +++++++++++++++++++++
3 files changed, 175 insertions(+)
create mode 100644 Reti/Laboratorio/.gitignore
create mode 100644 Reti/Laboratorio/myFirstNetworkApp/client.c
create mode 100644 Reti/Laboratorio/myFirstNetworkApp/server.c
diff --git a/Reti/Laboratorio/.gitignore b/Reti/Laboratorio/.gitignore
new file mode 100644
index 0000000..5761abc
--- /dev/null
+++ b/Reti/Laboratorio/.gitignore
@@ -0,0 +1 @@
+*.o
diff --git a/Reti/Laboratorio/myFirstNetworkApp/client.c b/Reti/Laboratorio/myFirstNetworkApp/client.c
new file mode 100644
index 0000000..2071a5f
--- /dev/null
+++ b/Reti/Laboratorio/myFirstNetworkApp/client.c
@@ -0,0 +1,75 @@
+#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;
+
+}
+
diff --git a/Reti/Laboratorio/myFirstNetworkApp/server.c b/Reti/Laboratorio/myFirstNetworkApp/server.c
new file mode 100644
index 0000000..f7a600d
--- /dev/null
+++ b/Reti/Laboratorio/myFirstNetworkApp/server.c
@@ -0,0 +1,99 @@
+#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;
+
+}
+
--
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