rcmdsh -- return a stream to a remote command without superuser
rcmdsh(char **ahost, int inport, const char *locuser,
const char *remuser, const char *cmd, const char *rshprog);
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 rshd(8) or the value of rshprog (if non-NULL).
The rcmdsh() function looks up the host *ahost using gethostbyname(3),
returning -1 if the host does not exist. Otherwise *ahost is set to the
standard name of the host and a connection is established to a server
residing at the well-known Internet port ``shell/tcp'' (or whatever port
is used by rshprog). The inport argument 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, stdout, and stderr.
The rcmdsh() function returns a valid socket descriptor on success. Otherwise,
-1 is returned and a diagnostic message is printed on the standard
rsh(1), socketpair(2), rcmd(3), rshd(8)
If rsh(1) encounters an error, a file descriptor is still returned
instead of -1.
The rcmdsh() function first appeared in OpenBSD 2.0, and made its way
into FreeBSD 4.6.
FreeBSD 5.2.1 September 1, 1996 FreeBSD 5.2.1 [ Back ]