first

client/cli.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+int main(int argc, char **argv)
+{
+	 struct hostent *hname;
+	 struct in_addr **addr_list;
+	 int i;
+struct sockaddr_in sa,cli;
+int n,sockfd;
+int len;char buff[100];
+sockfd=socket(AF_INET,SOCK_STREAM,0);
+if(sockfd<0){ printf("\nError in Socket");
+exit(0);
+}
+else printf("\nSocket is Opened");
+bzero(&sa,sizeof(sa));
+sa.sin_family=AF_INET;
+sa.sin_port=htons(9924);
+inet_pton(AF_INET, argv[1], &sa.sin_addr);
+if(connect(sockfd,(struct sockaddr*)&sa,sizeof(sa))<0)
+{
+printf("\nError in connection failed");
+exit(0);
+}
+else
+printf("\nconnected successfully");
+if(n=read(sockfd,buff,sizeof(buff))<0)
+{
+printf("\nError in Reading");
+exit(0);
+}
+else
+{printf("\nMessage Read %s",buff);
+}
+// printf("%s\n", inet_ntoa(sa.sin_addr));
+
+        if ((hname = gethostbyname(argv[1])) == NULL) {
+            perror("hostname error");
+            exit(2);
+        }
+        printf("IP address of %s : ",argv[1]);
+        addr_list = (struct in_addr **)hname->h_addr_list;
+        for(i = 0; addr_list[i] != NULL; i++) {
+            printf("%s ", inet_ntoa(*addr_list[i]));
+        }
+        printf("\n");
+	printf("%d\n", ntohs(sa.sin_port));
+}

server/UDP-SErv.c

@@ -0,0 +1,52 @@
+#include"netinet/in.h"
+#include"sys/socket.h"
+#include"stdio.h"
+#include"string.h"
+#include"time.h"
+main( )
+{
+	struct sockaddr_in sa;
+	struct sockaddr_in cli;
+	int sockfd,conntfd;
+	int len,ch;
+	char str[100];
+	time_t tick;
+
+//socket function
+
+	sockfd=socket(AF_INET,SOCK_DGRAM,0);
+	if(sockfd<0)
+	{
+		printf("error in socket\n");
+		exit(0);
+	}
+	else 
+		printf("Socket opened");
+
+	bzero(&sa,sizeof(sa));
+	sa.sin_port=htons(9924);
+	sa.sin_addr.s_addr=htonl(0);
+//Binding of socket to ip address and port no.	
+	if(bind(sockfd,(struct sockaddr*)&sa,sizeof(sa))<0)
+	{
+		printf("Error in binding\n");
+	}
+	else
+		printf("Binded Successfully");
+
+//listens the clients requests andd max 50	
+	listen(sockfd,50);
+
+	for(;;)
+	{
+		len=sizeof(ch);
+		//accept client request
+		conntfd=accept(sockfd,(struct sockaddr*)&cli,&len);
+		printf("Accepted");
+		//prepare data to be sent to connected client
+		tick=time(NULL);
+		snprintf(str,sizeof(str),"%s",ctime(&tick));
+		printf("%s",str);
+		write(conntfd,str,100); //send data to client
+	}
+}