Capitalize letter server client

Server Side:

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#define PORT 3490

#define BACKLOG 10

int main()

{

    struct sockaddr_in server;

    struct sockaddr_in dest;

    int status,socket_fd, client_fd,num;

    socklen_t size;

    char buffer[10241];

    char *buff;

 memset(buffer,0,sizeof(buffer));

    int yes =1;

    if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0))== -1) {

        fprintf(stderr, "Socket failure!!\n");

        exit(1);

    }

    if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {

        perror("setsockopt");

        exit(1);

    }

    memset(&server, 0, sizeof(server));

    memset(&dest,0,sizeof(dest));

    server.sin_family = AF_INET;

    server.sin_port = htons(PORT);

    server.sin_addr.s_addr = INADDR_ANY;

    if ((bind(socket_fd, (struct sockaddr *)&server, sizeof(struct sockaddr )))== -1)    { //sizeof(struct sockaddr)

        fprintf(stderr, "Binding Failure\n");

        exit(1);

    }

    if ((listen(socket_fd, BACKLOG))== -1){

        fprintf(stderr, "Listening Failure\n");

        exit(1);

    }

   while(1) {

        size = sizeof(struct sockaddr_in);

        if ((client_fd = accept(socket_fd, (struct sockaddr *)&dest, &size))==-1 ) {

            perror("accept");

            exit(1);

        }

        printf("Server got connection from client %s\n", inet_ntoa(dest.sin_addr));

        while(1) {

                if ((num = recv(client_fd, buffer, 1024,0))== -1) {

                        perror("recv");

                        exit(1);

                }

                else if (num == 0) {

                        printf("Connection closed\n");

                        //So I can now wait for another client

                        break;

                }

                printf("Server:Msg Received %s\n", buffer);

                while(num--)

                {

                 buffer[num]= toupper(buffer[num]);

                 }

               

                //strcpy(buffer,"hello");

                if ((send(client_fd,buffer, strlen(buffer),0))== -1)

                {

                     fprintf(stderr, "Failure Sending Message\n");

                     close(client_fd);

                     break;

                }

                printf("Server:Msg being sent: %s\nNumber of bytes sent: %d\n",buffer, strlen(buffer));

        }

        close(client_fd);

    }

    close(socket_fd);

    return 0;

}

Client Side:-

           

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#define PORT 3490

#define MAXSIZE 1024

int main(int argc, char *argv[])

{

    struct sockaddr_in server_info;

    struct hostent *he;

    int socket_fd,num;

    char buffer[1024];

    char buff[1024];

    if (argc != 2) {

        fprintf(stderr, "Usage: client hostname\n");

        exit(1);

    }

    if ((he = gethostbyname(argv[1]))==NULL) {

        fprintf(stderr, "Cannot get host name\n");

        exit(1);

    }

    if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0))== -1) {

        fprintf(stderr, "Socket Failure!!\n");

        exit(1);

    }

    memset(&server_info, 0, sizeof(server_info));

    server_info.sin_family = AF_INET;

    server_info.sin_port = htons(PORT);

    server_info.sin_addr = *((struct in_addr *)he->h_addr);

    if (connect(socket_fd, (struct sockaddr *)&server_info, sizeof(struct sockaddr))<0) {

        //fprintf(stderr, "Connection Failure\n");

        perror("connect");

        exit(1);

    }

   

 while(1) {

        printf("Client: Enter Data for Server:\n");

        fgets(buffer,MAXSIZE-1,stdin);

        if ((send(socket_fd,buffer, strlen(buffer),0))== -1) {

                fprintf(stderr, "Failure Sending Message\n");

                close(socket_fd);

                exit(1);

        }

        else {

                printf("Client:Message being sent: %s\n",buffer);

                num = recv(socket_fd, buffer, sizeof(buffer),0);

                if ( num <= 0 )

                {

                        printf("Either Connection Closed or Error\n");

                        //Break from the While

                        break;

                }

                buff[num] = '\0';

                printf("Client:Message Received From Server -  %s\n",buffer);

           }

    }

    close(socket_fd);

}