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Special Forums IP Networking Help with Unix socket programing Post 302418965 by karthik1238 on Thursday 6th of May 2010 01:01:17 AM
Old 05-06-2010
Help with Unix socket programing

hi

I am strucked in a client server program

client need to login to server
client logins if only username and password are correct

i have written a program

username is stored as file and password is smilar to username whic is stored in that file

when server asks for username ,client provides
it opens the file and check string for password if it matches rest operations are allowed otherwise client s disconnected

Code:
//#include "unp.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 

void error(char *msg)
{
    perror(msg);
    exit(0);
}

int main(int argc, char *argv[])
{
    int sockfd, portno, n,*choice;

    struct sockaddr_in serv_addr;
    struct hostent *server;

    char buffer[256];
    if (argc < 3) {
       fprintf(stderr,"usage %s hostname port\n", argv[0]);
       exit(0);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
 }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) 
        error("ERROR connecting");
bzero(buffer,256);// clears buffer
    n = read(sockfd,buffer,255);//reading
    if (n < 0) 
         error("ERROR readin from socket");
printf("%s", buffer);
 
    fgets(buffer,255,stdin);

//scanf("%d",choice);//readin mesg from terminal
    n = write(sockfd,buffer,255);//writes
    if (n < 0) 
         error("ERROR writing to socket");

if(*buffer == 'r'){
printf("enter user name :  ");

bzero(buffer,256);
fgets(buffer,255,stdin);//readin mesg from terminal
    n = write(sockfd,buffer,strlen(buffer));//writes
    if (n < 0) 
         error("ERROR writing to socket");
n = read(sockfd,buffer,255);//reading
    if (n < 0) 
         error("ERROR readin from socket");
printf("%s\n",buffer);// printing
bzero(buffer,256);

}

if(*buffer == 'l')//login
{
printf("enter your user name: ");

bzero(buffer,256);
fgets(buffer,255,stdin);//readin mesg from terminal
    n = write(sockfd,buffer,strlen(buffer));//writes
    if (n < 0) 
         error("ERROR writing to socket");
printf("\n enter your password");
bzero(buffer,256);
fgets(buffer,256,stdin);//readin mesg from terminal
    n = write(sockfd,buffer,strlen(buffer));//writes
n = read(sockfd,buffer,255);//reading
    if (n < 0) 
         error("ERROR readin from socket");
printf("%s\n",buffer);// printing

}
    while(1)
{
    printf("type  message: ");
    bzero(buffer,256);

    fgets(buffer,255,stdin);//readin mesg from terminal
    n = write(sockfd,buffer,strlen(buffer));//writes
    if (n < 0) 
         error("ERROR writing to socket");
    bzero(buffer,256);// clears buffer
    n = read(sockfd,buffer,255);//reading
    if (n < 0) 
         error("ERROR reading from socket");
    printf("%s\n",buffer);// printing
}
    return 0;
}

Code:
#include <stdio.h>
#include <sys/types.h> 
#include <sys/socket.h>
#include <netinet/in.h>
//#include "unp.h"

void readwrite(int, int, int); /* function prototype */
void error(char *msg)
{
    perror(msg);
    exit(1);
}

int main(int argc, char *argv[])
{
     int sockfd, newsockfd, portno, clilen, pid;
     struct sockaddr_in serv_addr, cli_addr;

     if (argc < 2) {
         fprintf(stderr,"ERROR, no port provided\n");
         exit(1);
     }
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0) 
        error("ERROR opening socket");
     bzero((char *) &serv_addr, sizeof(serv_addr));
     portno = atoi(argv[1]);
     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr.s_addr = INADDR_ANY;
     serv_addr.sin_port = htons(portno);
     if (bind(sockfd, (struct sockaddr *) &serv_addr,
              sizeof(serv_addr)) < 0) 
              error("ERROR on binding");
     listen(sockfd,5);
     clilen = sizeof(cli_addr);

     while (1) {
         newsockfd = accept(sockfd, 
               (struct sockaddr *) &cli_addr, &clilen);
         if (newsockfd < 0) 
             error("ERROR on accept");
         pid = fork();
         if (pid < 0)
             error("ERROR on fork");
         if (pid == 0)  {
             close(sockfd);
              int x,y,x1,y1,i=0,n,choice;
              char buffer[256],ex[256];
               FILE *fp;
           printf("Incoming connection from %s - sending welcome\n", inet_ntoa(cli_addr));
          n = write(newsockfd," welcome \n - select one \n r for registration \n l for login",145);
             if (n < 0) error("ERROR writin to socket");
 
 bzero(buffer,256);
                n = read(newsockfd,buffer,255);
               if (n < 0) error("ERROR reading from socket");

if(*buffer == 'r')
{
   
// n = write(newsockfd," welcome \n - please Enter a user name:",45);
            // if (n < 0) error("ERROR writing to socket");
             bzero(buffer,256);
                n = read(newsockfd,buffer,255);
               if (n < 0) error("ERROR reading from socket");
             fp=fopen(buffer,"a+");
             fwrite(buffer,1,strlen(buffer),fp);
n = write(newsockfd,"\n your user name is your password:",45);
             if (n < 0) error("ERROR writing to socket");
                            
              fclose(fp);
exit(0);

             
}
if(*buffer == 'l')
{
   char key[256];

bzero(buffer,256);
                n = read(newsockfd,buffer,255);
               if (n < 0) error("ERROR reading from socket");
       
  fp=fopen(buffer,"r");

  if(fp=='\0')
{
  n = write(newsockfd,"\n No user exist:",45);
             if (n < 0) error("ERROR writing to socket");
 // n = write(newsockfd,"\n please register :",45);
           //  if (n < 0) error("ERROR writing to socket");
}
else
{


bzero(buffer,256);
 n = read(newsockfd,buffer,255);
               

fscanf(fp,"%s",key);

if(strcmp(buffer,key)!=0)
{
n = write(newsockfd,"\nunsucessful login:",45);
            // if (n < 0) error("ERROR writing to socket");
break;
}

   
    n = write(newsockfd,"\n loged:",45);
             if (n < 0) 
          error("ERROR writing to socket");


              
}

}
         
  
              srand((unsigned)time(3));
              x=rand()%4;
              y=rand()%4;
             
             readwrite(newsockfd,x,y);
             exit(0);
         }
         else close(newsockfd);
     } /* end of while */
     return 0; /* we never get here */
}


void readwrite(int sock,int x ,int y)
{
   int n;
   char buffer[256];
   
  printf("x=%d y=%d",x,y);
    while(1){
   bzero(buffer,256);
   n = read(sock,buffer,255);
   if (n < 0) error("ERROR reading from socket");
   printf("Client: %s\n",buffer);
   n = write(sock,"Server :msg reached",25);
   if (n < 0) error("ERROR writing to socket");
}
 
}


Last edited by pludi; 05-06-2010 at 02:04 AM.. Reason: code tags, please...
 

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