chiark / gitweb /
Handle domain names properly, including RFC1035 quoting.
[zone] / sys.lisp
CommitLineData
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1;;; -*-lisp-*-
2;;;
3;;; System-specific functions
4;;;
5;;; (c) 2008 Straylight/Edgeware
6;;;
7
8;;;----- Licensing notice ---------------------------------------------------
9;;;
10;;; This program is free software; you can redistribute it and/or modify
11;;; it under the terms of the GNU General Public License as published by
12;;; the Free Software Foundation; either version 2 of the License, or
13;;; (at your option) any later version.
14;;;
15;;; This program is distributed in the hope that it will be useful,
16;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18;;; GNU General Public License for more details.
19;;;
20;;; You should have received a copy of the GNU General Public License
21;;; along with this program; if not, write to the Free Software Foundation,
22;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23
e1528fd6 24(cl:in-package #:net)
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25
26;;;--------------------------------------------------------------------------
27;;; Functions provided.
28
29#+ecl
30(cffi:defcfun gethostname :int
31 (name :pointer)
32 (len :uint))
33
e1528fd6 34(export 'gethostname)
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35(defun gethostname ()
36 "Return the hostname (not necessarily canonical) of the current host."
37
38 #+cmu
39 (unix:unix-gethostname)
40
41 #+sbcl
42 (sb-unix:unix-gethostname)
43
44 #+clisp
9b01dd96 45 (os:uname-nodename (os:uname))
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46
47 #+ecl
48 (cffi:with-foreign-pointer-as-string (buffer 256 len)
49 (let ((rc (gethostname buffer len)))
50 (unless (zerop rc)
51 (error "gethostname(2) failed (rc = ~A)." rc))))
52
53 #-(or cmu sbcl clisp ecl)
54 "<unknown-host>")
55
e1528fd6 56(export 'resolve-hostname)
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57(defun resolve-hostname (name)
58 "Resolve a hostname to an IP address using the DNS, or return nil."
59
60 #+cmu
61 (let ((he (ext:lookup-host-entry name)))
62 (and he (ext:host-entry-addr he)))
63
64 #+sbcl
65 (handler-case
66 (let* ((he (sb-bsd-sockets:get-host-by-name name))
67 (addr (sb-bsd-sockets:host-ent-address he)))
68 (reduce (lambda (acc byte) (logior (ash acc 8) byte)) addr))
69 (sb-bsd-sockets:name-service-error () nil))
70
71 #+clisp
72 (let ((he (ext:resolve-host-ipaddr name)))
73 (and he (string-ipaddr (car (ext:hostent-addr-list he)))))
74
75 #+ecl
76 (nth-value 2 (ext:lookup-host-entry name))
77
78 #-(or cmu sbcl clisp ecl)
79 nil)
80
e1528fd6 81(export 'canonify-hostname)
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82(defun canonify-hostname (name)
83 "Resolve a hostname to canonical form using the DNS, or return nil."
84
85 #+cmu
86 (let ((he (ext:lookup-host-entry name)))
87 (and he (ext:host-entry-name he)))
88
89 #+sbcl
90 (handler-case
91 (let ((he (sb-bsd-sockets:get-host-by-name name)))
92 (sb-bsd-sockets:host-ent-name he))
93 (sb-bsd-sockets:name-service-error () nil))
94
95 #+clisp
96 (let ((he (ext:resolve-host-ipaddr name)))
97 (and he (ext:hostent-name he)))
98
99 #+ecl
100 (nth-value 0 (ext:lookup-host-entry name))
101
102 #-(or cmu sbcl clisp ecl)
103 name)
104
105;;;----- That's all, folks --------------------------------------------------