Server with browser

**kapil1089thekin** · 02-01-2011

I have coded a server program which interacts with my client, but it doesnt interact with a browser, what could be the problem?
here is the
server.c:

Code:

#include <netinet/in.h>
#include <arpa/inet.h>


main(int argc, char *argv[])
{
        int                     sockfd, newsockfd ; /* Socket descriptors */
        int                     clilen;
        struct sockaddr_in      cli_addr, serv_addr;
        int port;

        int i, readsocks;
        char buf[100];          /* We will use this buffer for communication */

        if(argc != 2)   {
                printf("\nEnter port number only in the command line argument\n");
                exit(0);
        }
        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
                printf("Cannot create socket\n");
                exit(0);
        }
        port = atoi(argv[1]);
        printf("\nport is %d\n", port);
        serv_addr.sin_family            = AF_INET;
        serv_addr.sin_addr.s_addr       = INADDR_ANY;
        serv_addr.sin_port              = port;
        if (bind(sockfd, (struct sockaddr *) &serv_addr,
                                        sizeof(serv_addr)) < 0) {
                printf("Unable to bind local address\n");
                exit(0);
        }

        listen(sockfd, 5);
        clilen = sizeof(cli_addr);
        newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr,
                                        &clilen);
        printf("wow Some client is connected\n\n");
        close(newsockfd);
}

I am using "http://127.0.0.1:8080/" in the address bar of the mozilla firefox.
am running the server program on the same machine on the port 8080.
actually the server should print:

Code:

wow Some client is connected

but it does nothing..

**Salem** · 02-01-2011

You've got a connection, but you don't send anything down it - what were you expecting to happen?

**kapil1089thekin** · 02-01-2011

if i get a connection.. the server shoul print the line.. it is not printing that means the server has not get any connection..

**Salem** · 02-01-2011

System Calls or Bust
This suggests you need htons() on the port value.

Also, get Wireshark · Go deep. so you can see what is really happening "on the wire".

**~~CommonTater~~** · 02-01-2011

Port 8080 is a secure SSL port. The browser is probably trying to make a secured connection and gives up when it doesn't get the correct acknowledgements. Try it on port 80 which is the general HTTP port.

OR... use a different port altogether...

**rags_to_riches** · 02-01-2011

Port 8080 is not "a secure SSL port". 443 is the standard HTTPS port, but any port can actually serve as a secure port if the server is so configured.

To the OP: printf writes to standard output, not to the connected socket. You need to use send(), not printf().

**kapil1089thekin** · 02-01-2011

I have changed the code to :

Code:

        serv_addr.sin_addr.s_addr       = htonl(INADDR_ANY);
        serv_addr.sin_port              = htons(port);

still not working.
The client program now also is unable to connect to the server:
here is the client program.

Code:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

main(int argc, char *argv[])
{
        int                     sockfd ;
        struct sockaddr_in      serv_addr;

        if(argc != 3)   {
                printf("\nEnter SERVER_IP & PORT_NUMBER only in order as command line argument\n");
                exit(0);
        }


        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
                printf("Unable to create socket\n");
                exit(0);
        }
        serv_addr.sin_family            = AF_INET;
        serv_addr.sin_addr.s_addr       = inet_addr(argv[1]);
        serv_addr.sin_port              = atoi(argv[2]);
        if ((connect(sockfd, (struct sockaddr *) &serv_addr,
                                                sizeof(serv_addr))) < 0) {
                printf("Unable to connect to server\n");
                exit(0);
        }
}

I think any port number can be used if it can be bind by the server program.

I want to connect this client program too, and make the server work with browser too.

I am not using send but write just to check weather there is any connection has been established or not as accept() call blocks the process till there is any connection made.

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