NAME
rcmdsh —
return a stream to a remote command
without superuser
SYNOPSIS
#include
<unistd.h>
int
rcmdsh(char
**ahost, int
inport, const char
*locuser, const char
*remuser, const char
*cmd, char
*rshprog);
DESCRIPTION
The
rcmdsh()
function is used by normal users to execute a command on a remote machine
using an authentication scheme based on reserved port numbers using
ssh(1) or the value of rshprog (if non-null).
rshprog may be a fully-qualified path, a non-qualified
command, or a command containing space-separated command line arguments.
The
rcmdsh()
function looks up the host *ahost using
getaddrinfo(3) and, if the host exists,
*ahost is set to the canonical name of the host. A
connection is then established to a server residing at the well-known
Internet port shell/tcp (or whatever port is used by
rshprog). The parameter inport
is ignored; it is only included to provide an interface similar to
rcmd(3).
If the connection succeeds, a socket in the
UNIX-domain of type
SOCK_STREAM is returned to the caller, and given to
the remote command as stdin and stdout, and stderr.
DIAGNOSTICS
The rcmdsh() function returns a valid
socket descriptor on success. It returns -1 on error and prints a diagnostic
message on the standard error.
SEE ALSO
HISTORY
The rcmdsh() function first appeared in
OpenBSD 2.0.
BUGS
If ssh(1) encounters an error, a file descriptor is still returned instead of -1.