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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