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32 .\" @(#)rexec.3 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libcompat/4.3/rexec.3,v 1.12 2004/07/02 23:52:14 ru Exp $
35 .\" Taken from FreeBSD 5.4; not checked against Linux reality (mtk)
37 .\" 2007-12-08, mtk, Converted from mdoc to man macros
39 .TH REXEC 3 2007-12-28 "Linux" "Linux Programmer's Manual"
41 rexec \- return stream to a remote command
45 .BI "int rexec(char **" ahost ", int " inport ", char *" user ", "
46 .BI " char *" passwd ", char *" cmd ", int *" fd2p );
47 .\" This function requires _BSD_SOURCE on Linux
50 This interface is obsoleted by
59 .BR gethostbyname (3),
60 returning \-1 if the host does not exist.
63 is set to the standard name of the host.
64 If a username and password are both specified, then these
65 are used to authenticate to the foreign host; otherwise
66 the environment and then the user's
69 home directory are searched for appropriate information.
70 If all this fails, the user is prompted for the information.
74 specifies which well-known DARPA Internet port to use for
75 the connection; the call
76 .I "getservbyname(""exec"", ""tcp"")"
79 will return a pointer to a structure that contains the necessary port.
80 The protocol for connection is described in detail in
83 If the connection succeeds,
84 a socket in the Internet domain of type
87 the caller, and given to the remote command as
93 is nonzero, then an auxiliary channel to a control
94 process will be setup, and a descriptor for it will be placed
97 The control process will return diagnostic
98 output from the command (unit 2) on this channel, and will also
99 accept bytes on this channel as being
101 signal numbers, to be
102 forwarded to the process group of the command.
104 information returned does not include remote authorization failure,
105 as the secondary connection is set up after authorization has been
111 (unit 2 of the remote
112 command) will be made the same as the
115 provision is made for sending arbitrary signals to the remote process,
116 although you may be able to get its attention by using out-of-band data.
119 Present on the BSDs, Solaris, and many other systems.
127 function sends the unencrypted password across the network.
129 The underlying service is considered a big security hole and therefore
130 not enabled on many sites, see