AM335x network server error

Hi,

What server application is this?

Hi,

It is a simple echo server application based on C language as below.

#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <arpa/inet.h>
#include <errno.h>

#define MAXBUF 1024

/*
* usage:./a.out <IP_ADDRESS> <PORT_NUMBER>
*/
int main(int argc, char **argv)
{ int sockfd;
struct sockaddr_in self;
char buffer[MAXBUF];


/*---Create streaming socket---*/
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("Socket");
exit(errno);
}

/*---Initialize address/port structure---*/
bzero(&self, sizeof(self));
self.sin_family = AF_INET;
self.sin_port = htons(atoi(argv[2]));
self.sin_addr.s_addr = INADDR_ANY;

/*---Assign a port number to the socket---*/
if ( bind(sockfd, (struct sockaddr*)&self, sizeof(self)) != 0 )
{
perror("socket--bind");
exit(errno);
}

/*---Make it a "listening socket"---*/
if ( listen(sockfd, 20) != 0 )
{
perror("socket--listen");
exit(errno);
}

/*---Forever... ---*/
while (1)
{ int clientfd;
struct sockaddr_in client_addr;
int addrlen=sizeof(client_addr);

/*---accept a connection (creating a data pipe)---*/
clientfd = accept(sockfd, (struct sockaddr*)&client_addr, &addrlen);
printf("%s:%d connected\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

/*---Echo back anything sent---*/
send(clientfd, buffer, recv(clientfd, buffer, MAXBUF, 0), 0);

/*---Close data connection---*/
close(clientfd);
}

/*---Clean up (should never get here!)---*/
close(sockfd);
return 0;
}

Hi  Kemal,

Thanks for reply.

Yes you are correct that root privileges is require for standard port ( 0 -1024).

However when i run whoami command i got this output,

root@beaglebone:~# whoami

root

root@beaglebone:~#

Also for below command,

root@beaglebone:~# cat /etc/passwd |grep "/home" |cut -d: -f1
root
root@beaglebone:~#

So i logged as root user.

And I want also run  my application using standard port 0-1024 so how can resolve this error ?

Kindly suggest.

Thanks,

Dhaval

Hi Kemal,

When i run my server program on board then i got below error  for standard port (0-1024),

root@beaglebone:~# ./server 10.99.19.82 123

socket--bind: Permission denied

But when i run it for non standard port (>1024) then it do not give any error.

root@beaglebone:~# ./server 10.99.19.82 1234

root@beaglebone:~#

 

Kindly suggest us in this matter.

Thanks,

Dhaval

Hi Kemal,

root@beaglebone:~# id

uid=0(root) gid=0(root) groups=0(root)

we get the above result and our account is a root account but we can access the standard ports(0-1024) as a root account. So, the i want to access this ports. so, please suggest.