From 5496448b6a2a06e774ad93918b18415972e33fdc Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Mon, 1 Nov 2021 22:40:58 +0100
Subject: tsdwl: add socket tcp client/server

---
 Year_3/TSDWL/socket_tcp/client.c | 59 ++++++++++++++++++++++++++++++
 Year_3/TSDWL/socket_tcp/server.c | 77 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 136 insertions(+)
 create mode 100644 Year_3/TSDWL/socket_tcp/client.c
 create mode 100644 Year_3/TSDWL/socket_tcp/server.c

diff --git a/Year_3/TSDWL/socket_tcp/client.c b/Year_3/TSDWL/socket_tcp/client.c
new file mode 100644
index 0000000..a4056db
--- /dev/null
+++ b/Year_3/TSDWL/socket_tcp/client.c
@@ -0,0 +1,59 @@
+#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[])
+{
+    int sockfd;
+    struct sockaddr_in addr;
+    socklen_t addrlen;
+    char buffer[1024];
+    int nbytes;
+
+    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+        perror("Error with socket creation");
+        exit(1);
+    }
+
+    addr.sin_port = htons(atoi(argv[1]));
+    addr.sin_family = AF_INET;
+    if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) == -1) {
+        perror("Can't convert IP in bytes");
+        exit(1);
+    }
+
+    addrlen = sizeof(addr);
+
+    if ((connect(sockfd, (struct sockaddr*)&addr, addrlen)) == -1) {
+        perror("Error with the connection");
+        exit(1);
+    }
+
+    nbytes = 0;
+    do {
+        if (strncmp(buffer, "quit", 4) == 0)
+            break;
+
+        if (nbytes == -1) {
+            perror("Error sending data");
+            break;
+        }
+
+        fgets(buffer, 1024, stdin);
+
+    } while ((nbytes = send(sockfd, buffer, strlen(buffer), 0)) > 0);
+
+    if (recv(sockfd, buffer, 1024, 0) > 0) {
+        printf("%s", buffer);
+    }
+
+    close(sockfd);
+
+    return 0;
+}
diff --git a/Year_3/TSDWL/socket_tcp/server.c b/Year_3/TSDWL/socket_tcp/server.c
new file mode 100644
index 0000000..7e9da88
--- /dev/null
+++ b/Year_3/TSDWL/socket_tcp/server.c
@@ -0,0 +1,77 @@
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define PORT 3030
+#define CONNECTIONS_NUM 1
+
+int
+main(int argc, char* argv[])
+{
+    int sockfd, clientfd;
+    struct sockaddr_in address;
+    socklen_t addrlen;
+    int nbytes, ntotbytes;
+    char buffer[1024];
+
+    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+        perror("Error creating a new socket");
+        exit(1);
+    }
+
+    address.sin_family = AF_INET;
+    address.sin_port = htons(atoi(argv[1]));
+    address.sin_addr.s_addr = INADDR_ANY;
+
+    addrlen = sizeof(address);
+
+    if (bind(sockfd, (struct sockaddr*)&address, addrlen) == -1) {
+        perror("Error binding the port");
+        exit(1);
+    }
+
+    if (listen(sockfd, CONNECTIONS_NUM) == -1) {
+        perror("Can't listen that port");
+        exit(1);
+    }
+
+    while (1) {
+        if ((clientfd = accept(sockfd, (struct sockaddr*)&address, &addrlen)) == -1) {
+            perror("Can't accept request from client");
+            break;
+        }
+
+        ntotbytes = 0;
+        while ((nbytes = recv(clientfd, buffer, 1024, 0)) != 0) {
+            if (nbytes == -1) {
+                perror("Error reading the client");
+                break;
+            }
+
+            buffer[nbytes] = '\0';
+            if (strncmp(buffer, "quit", 4) == 0) {
+                break;
+            }
+
+            printf("%s", buffer);
+            ntotbytes += nbytes;
+        }
+
+        sprintf(buffer, "Total bytes read: %d\n", ntotbytes);
+
+        if ((nbytes = send(clientfd, buffer, strlen(buffer), 0)) != strlen(buffer)) {
+            perror("Error sending back a message");
+        }
+
+        close(clientfd);
+    }
+
+    close(sockfd);
+
+    return 0;
+}
-- 
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