udp server client

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<string.h>

int main(int argc,char **argv){

            if(argc<2)

            {

                        printf("insuffcient parameters");

                        exit(0);

            }

            struct sockaddr_in servsock;

            int sockfd,size;

            char msg[1024],str[1024];

            if((sockfd=socket(AF_INET,SOCK_DGRAM,0))<0) {

                        perror("");

                        exit(0); }

            printf("socket created\n");

            size=sizeof(struct sockaddr);

            socklen_t len=sizeof(servsock);

            bzero(&servsock,size);

            servsock.sin_port=htons(3000);

            servsock.sin_family=AF_INET;

            servsock.sin_addr.s_addr=inet_addr(argv[1]);

            if(strcmp(msg,"bye")==0)

                        exit(0);

            while(strcmp(msg,"bye")!=0)

                        { printf("\n client: ");

                        scanf("%s",msg);

                        if((sendto(sockfd,msg,sizeof(msg),0,(struct sockaddr*)&servsock,len))<0)

                                    {perror("not send");

                                    exit(0); }

                        if(strcmp(msg,"bye")==0)

                                    exit(0);

                        printf("\n from server: ");

                        if((recvfrom(sockfd,str,1024,0,NULL,NULL))<0)

                        {

                                    perror("not received");

                                    exit(0); }

                        printf("%s",str);

            }

            close(sockfd);

            return 0;

}

Server Side:-

//server program

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<string.h>

int main(int argc,char **argv)

{

            struct sockaddr_in mysock,newsock;

            int sockfd;

            char buf[1024];

            int size,val;

            if((sockfd=socket(AF_INET,SOCK_DGRAM,0))<0){

                        perror("no socket");

                        exit(0);}

            size=sizeof(struct sockaddr);

            socklen_t len=sizeof(newsock);

            bzero(&mysock,size);

            mysock.sin_family=AF_INET;

            mysock.sin_port=htons(3000);

            mysock.sin_addr.s_addr=htonl(INADDR_ANY);

            if((bind(sockfd,(struct sockaddr*)&mysock,size))<0){

                        perror("no bind");

                        exit(0);}

            if(strcmp(buf,"bye")==0)

                        exit(0);

            while(strcmp(buf,"bye")!=0)

            {

                        if((val=recvfrom(sockfd,buf,1024,0,(struct sockaddr*)&newsock,&len))<0){

                                    perror(" ");

                                    exit(0);}

                        printf("\n from client: ");

                        printf("%s",buf);

                        if(strcmp(buf,"bye")==0){

                                    printf("\nserver: ");

                                    scanf("%s",buf);

                                    exit(0);}

                        printf("\n server: ");

                        scanf("%s",buf);

                        if((sendto(sockfd,buf,val,0,(struct sockaddr*)&newsock,len))<0){

                                    perror("\n no send");

                                    exit(0);}

                        }

            close(sockfd);

            return 0;

}