From c5fcf7179a83ef65c86c6a4a390029149e518649 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Tue, 5 Oct 2021 21:49:54 +0200
Subject: Duzy commit ze smieciami

---
 semestr-4/sieci/pracownia2/udp_server.c | 59 +++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100755 semestr-4/sieci/pracownia2/udp_server.c

(limited to 'semestr-4/sieci/pracownia2/udp_server.c')

diff --git a/semestr-4/sieci/pracownia2/udp_server.c b/semestr-4/sieci/pracownia2/udp_server.c
new file mode 100755
index 0000000..b5ae6d1
--- /dev/null
+++ b/semestr-4/sieci/pracownia2/udp_server.c
@@ -0,0 +1,59 @@
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+int main()
+{
+	int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (sockfd < 0) {
+		fprintf(stderr, "socket error: %s\n", strerror(errno)); 
+		return EXIT_FAILURE;
+	}
+
+	struct sockaddr_in server_address;
+	bzero (&server_address, sizeof(server_address));
+	server_address.sin_family      = AF_INET;
+	server_address.sin_port        = htons(54321);
+	server_address.sin_addr.s_addr = htonl(INADDR_ANY);
+	if (bind (sockfd, (struct sockaddr*)&server_address, sizeof(server_address)) < 0) {
+		fprintf(stderr, "bind error: %s\n", strerror(errno)); 
+		return EXIT_FAILURE;
+	}
+
+	for (;;) {
+
+		struct sockaddr_in 	sender;	
+		socklen_t 			sender_len = sizeof(sender);
+		u_int8_t 			buffer[IP_MAXPACKET+1];
+
+		ssize_t datagram_len = recvfrom (sockfd, buffer, IP_MAXPACKET, 0, (struct sockaddr*)&sender, &sender_len);
+		if (datagram_len < 0) {
+			fprintf(stderr, "recvfrom error: %s\n", strerror(errno)); 
+			return EXIT_FAILURE;
+		}
+		
+		char sender_ip_str[20]; 
+		inet_ntop(AF_INET, &(sender.sin_addr), sender_ip_str, sizeof(sender_ip_str));
+		printf ("Received UDP packet from IP address: %s, port: %d\n", sender_ip_str, ntohs(sender.sin_port));
+
+		buffer[datagram_len] = 0;
+		printf ("%ld-byte message: +%s+\n", datagram_len, buffer);
+		
+		char* reply = "Thank you!";
+		ssize_t reply_len = strlen(reply);
+		if (sendto(sockfd, reply, reply_len, 0, (struct sockaddr*)&sender, sender_len) != reply_len) {
+			fprintf(stderr, "sendto error: %s\n", strerror(errno)); 
+			return EXIT_FAILURE;		
+		}
+
+		fflush(stdout);
+	}
+
+	close (sockfd);
+	return EXIT_SUCCESS;
+}
+
-- 
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