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1 | .\" Copyright (c) 1983, 1991, 1993 |
2 | .\" The Regents of the University of California. All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
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 $ | |
34 | .\" | |
0bd5e3de MK |
35 | .\" Taken from FreeBSD 5.4; not checked against Linux reality (mtk) |
36 | .\" | |
352bedee | 37 | .\" 2007-12-08, mtk, Converted from mdoc to man macros |
3233d665 | 38 | .\" |
5ec60461 | 39 | .TH REXEC 3 2007-12-28 "Linux" "Linux Programmer's Manual" |
3233d665 MK |
40 | .SH NAME |
41 | rexec \- return stream to a remote command | |
42 | .SH SYNOPSIS | |
43 | .nf | |
44 | .sp | |
45 | .BI "int rexec(char **" ahost ", int " inport ", char *" user ", " | |
46 | .BI " char *" passwd ", char *" cmd ", int *" fd2p ); | |
cc4615cc | 47 | .\" This function requires _BSD_SOURCE on Linux |
3233d665 MK |
48 | .fi |
49 | .SH DESCRIPTION | |
9a562e42 | 50 | This interface is obsoleted by |
3233d665 MK |
51 | .BR rcmd (3). |
52 | ||
9a562e42 | 53 | The |
3233d665 | 54 | .BR rexec () |
9a562e42 MK |
55 | function |
56 | looks up the host | |
3233d665 | 57 | .IR *ahost |
9a562e42 | 58 | using |
3233d665 | 59 | .BR gethostbyname (3), |
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60 | returning \-1 if the host does not exist. |
61 | Otherwise | |
3233d665 | 62 | .IR *ahost |
9a562e42 MK |
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 | |
3233d665 | 67 | .I .netrc |
9a562e42 MK |
68 | file in his |
69 | home directory are searched for appropriate information. | |
70 | If all this fails, the user is prompted for the information. | |
5ec60461 | 71 | .PP |
9a562e42 | 72 | The port |
3233d665 | 73 | .I inport |
f084be74 | 74 | specifies which well-known DARPA Internet port to use for |
9a562e42 | 75 | the connection; the call |
ad2f1d0b | 76 | .I "getservbyname(""exec"", ""tcp"")" |
9a562e42 | 77 | (see |
3233d665 | 78 | .BR getservent (3)) |
f084be74 | 79 | will return a pointer to a structure that contains the necessary port. |
9a562e42 | 80 | The protocol for connection is described in detail in |
3233d665 | 81 | .BR rexecd (8). |
5ec60461 | 82 | .PP |
9a562e42 MK |
83 | If the connection succeeds, |
84 | a socket in the Internet domain of type | |
3233d665 | 85 | .BR SOCK_STREAM |
9a562e42 MK |
86 | is returned to |
87 | the caller, and given to the remote command as | |
3233d665 | 88 | .IR stdin |
9a562e42 | 89 | and |
3233d665 | 90 | .IR stdout . |
9a562e42 | 91 | If |
3233d665 | 92 | .I fd2p |
eba72288 | 93 | is non-zero, then an auxiliary channel to a control |
9a562e42 MK |
94 | process will be setup, and a descriptor for it will be placed |
95 | in | |
3233d665 | 96 | .IR *fd2p . |
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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 | |
3233d665 | 100 | Unix |
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101 | signal numbers, to be |
102 | forwarded to the process group of the command. | |
103 | The diagnostic | |
104 | information returned does not include remote authorization failure, | |
105 | as the secondary connection is set up after authorization has been | |
106 | verified. | |
107 | If | |
3233d665 | 108 | .I fd2p |
9a562e42 | 109 | is 0, then the |
3233d665 | 110 | .IR stderr |
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111 | (unit 2 of the remote |
112 | command) will be made the same as the | |
3233d665 | 113 | .IR stdout |
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114 | and no |
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. | |
3233d665 | 117 | .SH "CONFORMING TO" |
a7fadb55 MK |
118 | Not in POSIX.1-2001. |
119 | Present on the BSDs, Solaris, and many other systems. | |
9a562e42 | 120 | The |
3233d665 | 121 | .BR rexec () |
9a562e42 | 122 | function appeared in |
3233d665 MK |
123 | 4.2BSD. |
124 | .SH BUGS | |
9a562e42 | 125 | The |
3233d665 | 126 | .BR rexec () |
9a562e42 | 127 | function sends the unencrypted password across the network. |
5ec60461 | 128 | .PP |
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129 | The underlying service is considered a big security hole and therefore |
130 | not enabled on many sites, see | |
3233d665 | 131 | .BR rexecd (8) |
9a562e42 | 132 | for explanations. |
3233d665 MK |
133 | .SH SEE ALSO |
134 | .BR rcmd (3), | |
135 | .BR rexecd (8) |