From 97ec0740a9ee3269b358859bd45fb03dbd8a49e1 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 2 Nov 2021 09:15:49 +0100
Subject: tsdwl: add socket udp client/server

---
 Year_3/TSDWL/socket_udp/client.c | 37 ++++++++++++++++++++++++++++++++++
 Year_3/TSDWL/socket_udp/server.c | 43 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 Year_3/TSDWL/socket_udp/client.c
 create mode 100644 Year_3/TSDWL/socket_udp/server.c

diff --git a/Year_3/TSDWL/socket_udp/client.c b/Year_3/TSDWL/socket_udp/client.c
new file mode 100644
index 0000000..8748db5
--- /dev/null
+++ b/Year_3/TSDWL/socket_udp/client.c
@@ -0,0 +1,37 @@
+#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;
+
+    if ((sockfd = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
+        perror("Error with socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(atoi(argv[1]));
+    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 (sendto(sockfd, argv[2], strlen(argv[2]), 0, (struct sockaddr*)&addr, addrlen) == -1) {
+        perror("Message not sent");
+    }
+
+    close(sockfd);
+
+    return 0;
+}
diff --git a/Year_3/TSDWL/socket_udp/server.c b/Year_3/TSDWL/socket_udp/server.c
new file mode 100644
index 0000000..99e0ecb
--- /dev/null
+++ b/Year_3/TSDWL/socket_udp/server.c
@@ -0,0 +1,43 @@
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.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_DGRAM, 0)) == -1) {
+        perror("Error creating a new socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(atoi(argv[1]));
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addrlen = sizeof(addr);
+
+    if (bind(sockfd, (struct sockaddr*)&addr, addrlen) == -1) {
+        perror("Can't bind this socket");
+        exit(1);
+    }
+
+    while ((nbytes = recv(sockfd, buffer, 1024, 0)) != 0) {
+        if (nbytes == -1) {
+            perror("Error receiving data");
+        }
+        buffer[nbytes] = '\0';
+
+        printf("%s\n", buffer);
+    }
+
+    close(sockfd);
+    return 0;
+}
-- 
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