Re: remote login

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You'll have to attach the slave side of a pseudo terminal to stdio descriptors of the 'ssh' command.

man openpty

Cheers,
-kls

mara ailiez sy wrote:

Hello...

I am currently developing my undergrad thesis and is
developing a remote login with the username and
password supplied. I have created the code below.
However, I keep getting an error about "Pseudo
termnial cannot be allocated because the stdin is not
a terminal". Then a permission denied ... I  was
wondering if the use of pipe as the communication
between the processes can be done?



#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#define BUFFERSIZE 256



int main() {

 int n;
 char buffer[BUFFERSIZE];

int fds_ci[2]; // file descriptors - child input


int fds_co[2]; // file descriptors - child output



// create the I/O pipes if (0 != pipe(fds_ci) || 0 != pipe(fds_co)) return 1;

 // create the child process
 if (fork() == 0)
 {

// in the child process
dup2(fds_ci[1], 0);


dup2(fds_co[0], 1);


close(fds_ci[0]); close(fds_ci[1]); close(fds_co[0]); close(fds_co[1]);


execl("/usr/bin/ssh", "ssh", "root@localhost", NULL); return 2;

}

// in parent process
close(fds_ci[1]); close(fds_co[0]); write(fd_ci[1], "password", BUFFERSIZE);


 // read child's output and redirect it to standard
output
 while (0 < (n = read(fds_co[0], buffer,
BUFFERSIZE))) {
   // write to the parent's stdout
   write(stdout, buffer, n);
 }


// close the remaining pipes close(fds_ci[0]); close(fds_co[1]);

 return 0;
}


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Look ma, no threads[1]. [1] BitTorrent in C is http://www.sf.net/projects/libbt
// .--=,
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