From 9240342b366db9999f11659a1f1c396ba418ad78 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Sat, 7 Jan 2023 18:51:03 +0100
Subject: Adds

---
 Year_3/TSDWL/ex_20161004/socket.c | 75 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Year_3/TSDWL/ex_20161004/socket.c

(limited to 'Year_3/TSDWL/ex_20161004')

diff --git a/Year_3/TSDWL/ex_20161004/socket.c b/Year_3/TSDWL/ex_20161004/socket.c
new file mode 100644
index 0000000..7d018c8
--- /dev/null
+++ b/Year_3/TSDWL/ex_20161004/socket.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+char*
+check_string(char buffer[1024], int n)
+{
+    char* string = "yes";
+    int i;
+
+    for(i = 0; i < n; ++i) {
+        if (buffer[i] != 'V' && buffer[i] != 'F') {
+            strcpy(string, "no");
+            break;
+        }
+    }
+
+    return string;
+}
+
+int
+main(int argc, char* argv[])
+{
+    int sockfd, clientfd;
+    struct sockaddr_in addr;
+    socklen_t addrlen;
+    char buffer[1024];
+    char* result;
+    int n;
+
+    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addr.sin_port = htons(3333);
+    addr.sin_family = AF_INET;
+
+    addrlen = sizeof(addr);
+
+    if (bind(sockfd, (struct sockaddr*) &addr, addrlen) == -1) {
+        perror("bind");
+        exit(1);
+    }
+
+    if (listen(sockfd, 1) == -1) {
+        perror("listen");
+        exit(1);
+    }
+
+    while (1) {
+        if ((clientfd = accept(sockfd, (struct sockaddr*) &addr, &addrlen)) == -1) {
+            perror("accept");
+            exit(1);
+        }
+
+        if ((n = read(clientfd, buffer, sizeof(buffer))) == -1) {
+            perror("read");
+            goto clientclose;
+        }
+
+        result = check_string(buffer, n);
+        printf("%s\n", result);
+
+clientclose:
+        close(clientfd);
+    }
+
+    close(sockfd);
+    return 0;
+}
-- 
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