1 ;;; net-utils.el --- network functions
3 ;; Copyright (C) 1998-2015 Free Software Foundation, Inc.
5 ;; Author: Peter Breton <pbreton@cs.umb.edu>
6 ;; Created: Sun Mar 16 1997
7 ;; Keywords: network comm
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 ;; There are three main areas of functionality:
29 ;; * Wrap common network utility programs (ping, traceroute, netstat,
30 ;; nslookup, arp, route). Note that these wrappers are of the diagnostic
31 ;; functions of these programs only.
33 ;; * Implement some very basic protocols in Emacs Lisp (finger and whois)
35 ;; * Support connections to HOST/PORT, generally for debugging and the like.
36 ;; In other words, for doing much the same thing as "telnet HOST PORT", and
37 ;; then typing commands.
41 ;; On some systems, some of these programs are not in normal user path,
42 ;; but rather in /sbin, /usr/sbin, and so on.
47 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
48 ;; Customization Variables
49 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
51 (defgroup net-utils nil
52 "Network utility functions."
57 (defcustom traceroute-program
58 (if (eq system-type 'windows-nt)
61 "Program to trace network hops to a destination."
65 (defcustom traceroute-program-options nil
66 "Options for the traceroute program."
68 :type '(repeat string))
70 (defcustom ping-program "ping"
71 "Program to send network test packets to a host."
75 ;; On GNU/Linux and Irix, the system's ping program seems to send packets
76 ;; indefinitely unless told otherwise
77 (defcustom ping-program-options
78 (and (memq system-type '(gnu/linux irix))
80 "Options for the ping program.
81 These options can be used to limit how many ICMP packets are emitted."
83 :type '(repeat string))
85 (define-obsolete-variable-alias 'ipconfig-program 'ifconfig-program "22.2")
87 (defcustom ifconfig-program
88 (if (eq system-type 'windows-nt)
91 "Program to print network configuration information."
95 (define-obsolete-variable-alias 'ipconfig-program-options
96 'ifconfig-program-options "22.2")
98 (defcustom ifconfig-program-options
100 (if (eq system-type 'windows-nt)
102 "Options for the ifconfig program."
104 :type '(repeat string))
106 (defcustom iwconfig-program "iwconfig"
107 "Program to print wireless network configuration information."
112 (defcustom iwconfig-program-options nil
113 "Options for the iwconfig program."
115 :type '(repeat string)
118 (defcustom netstat-program "netstat"
119 "Program to print network statistics."
123 (defcustom netstat-program-options
125 "Options for the netstat program."
127 :type '(repeat string))
129 (defcustom arp-program "arp"
130 "Program to print IP to address translation tables."
134 (defcustom arp-program-options
136 "Options for the arp program."
138 :type '(repeat string))
140 (defcustom route-program
141 (if (eq system-type 'windows-nt)
144 "Program to print routing tables."
148 (defcustom route-program-options
149 (if (eq system-type 'windows-nt)
152 "Options for the route program."
154 :type '(repeat string))
156 (defcustom nslookup-program "nslookup"
157 "Program to interactively query DNS information."
161 (defcustom nslookup-program-options nil
162 "Options for the nslookup program."
164 :type '(repeat string))
166 (defcustom nslookup-prompt-regexp "^> "
167 "Regexp to match the nslookup prompt.
169 This variable is only used if the variable
170 `comint-use-prompt-regexp' is non-nil."
174 (defcustom dig-program "dig"
175 "Program to query DNS information."
179 (defcustom ftp-program "ftp"
180 "Program to run to do FTP transfers."
184 (defcustom ftp-program-options nil
185 "Options for the ftp program."
187 :type '(repeat string))
189 (defcustom ftp-prompt-regexp "^ftp>"
190 "Regexp which matches the FTP program's prompt.
192 This variable is only used if the variable
193 `comint-use-prompt-regexp' is non-nil."
197 (defcustom smbclient-program "smbclient"
202 (defcustom smbclient-program-options nil
203 "Options for the smbclient program."
205 :type '(repeat string))
207 (defcustom smbclient-prompt-regexp "^smb: \>"
208 "Regexp which matches the smbclient program's prompt.
210 This variable is only used if the variable
211 `comint-use-prompt-regexp' is non-nil."
215 (defcustom dns-lookup-program "host"
216 "Program to interactively query DNS information."
220 (defcustom dns-lookup-program-options nil
221 "Options for the dns-lookup program."
223 :type '(repeat string))
225 ;; Internal variables
226 (defvar network-connection-service nil)
227 (defvar network-connection-host nil)
229 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
231 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
233 (defvar nslookup-font-lock-keywords
235 (list "^[A-Za-z0-9 _]+:" 0 'font-lock-type-face)
236 (list "\\<\\(SOA\\|NS\\|MX\\|A\\|CNAME\\)\\>"
237 1 'font-lock-keyword-face)
241 (make-list 4 "[0-9]+")
243 0 'font-lock-variable-name-face)
246 (let ((host-expression "[-A-Za-z0-9]+"))
249 (make-list 2 host-expression)
251 "\\(\\." host-expression "\\)*"))
252 0 'font-lock-variable-name-face))
253 "Expressions to font-lock for nslookup.")
255 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
256 ;; General network utilities mode
257 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
259 (defvar net-utils-font-lock-keywords
263 (mapconcat 'identity (make-list 4 "[0-9]+") "\\.")
264 0 'font-lock-variable-name-face)
265 ;; Simple rfc4291 addresses
267 "\\( \\([[:xdigit:]]+\\(:\\|::\\)\\)+[[:xdigit:]]+\\)"
269 "\\(::[[:xdigit:]]+\\)")
270 0 'font-lock-variable-name-face)
273 (let ((host-expression "[-A-Za-z0-9]+"))
275 (mapconcat 'identity (make-list 2 host-expression) "\\.")
276 "\\(\\." host-expression "\\)*"))
277 0 'font-lock-variable-name-face))
278 "Expressions to font-lock for general network utilities.")
280 (define-derived-mode net-utils-mode special-mode "NetworkUtil"
281 "Major mode for interacting with an external network utility."
282 (set (make-local-variable 'font-lock-defaults)
283 '((net-utils-font-lock-keywords)))
284 (setq-local revert-buffer-function #'net-utils--revert-function))
286 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
288 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
290 ;; Simplified versions of some at-point functions from ffap.el.
291 ;; It's not worth loading all of ffap just for these.
292 (defun net-utils-machine-at-point ()
294 (buffer-substring-no-properties
296 (skip-chars-backward "-a-zA-Z0-9.")
299 (skip-chars-forward "-a-zA-Z0-9.")
300 (skip-chars-backward "." pt)
303 (defun net-utils-url-at-point ()
305 (buffer-substring-no-properties
307 (skip-chars-backward "--:=&?$+@-Z_a-z~#,%")
308 (skip-chars-forward "^A-Za-z0-9" pt)
311 (skip-chars-forward "--:=&?$+@-Z_a-z~#,%")
312 (skip-chars-backward ":;.,!?" pt)
315 (defun net-utils-remove-ctrl-m-filter (process output-string)
316 "Remove trailing control Ms."
317 (with-current-buffer (process-buffer process)
319 (let ((inhibit-read-only t)
320 (filtered-string output-string))
321 (while (string-match "\r" filtered-string)
322 (setq filtered-string
323 (replace-match "" nil nil filtered-string)))
324 ;; Insert the text, moving the process-marker.
325 (goto-char (process-mark process))
326 (insert filtered-string)
327 (set-marker (process-mark process) (point))))))
329 (defun net-utils-run-program (name header program args)
330 "Run a network information program."
331 (let ((buf (get-buffer-create (concat "*" name "*")))
332 (coding-system-for-read
333 ;; MS-Windows versions of network utilities output text
334 ;; encoded in the console (a.k.a. "OEM") codepage, which is
335 ;; different from the default system (a.k.a. "ANSI")
337 (if (eq system-type 'windows-nt)
338 (intern (format "cp%d" (w32-get-console-output-codepage)))
339 coding-system-for-read)))
344 (apply 'start-process name buf program args)
345 'net-utils-remove-ctrl-m-filter)
349 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
350 ;; General network utilities (diagnostic)
351 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
353 ;; Todo: This data could be saved in a bookmark.
354 (defvar net-utils--revert-cmd nil)
356 (defun net-utils-run-simple (buffer program-name args &optional nodisplay)
357 "Run a network utility for diagnostic output only."
358 (with-current-buffer (if (stringp buffer) (get-buffer-create buffer) buffer)
359 (let ((proc (get-buffer-process (current-buffer))))
361 (set-process-filter proc nil)
362 (delete-process proc)))
363 (let ((inhibit-read-only t)
364 (coding-system-for-read
365 ;; MS-Windows versions of network utilities output text
366 ;; encoded in the console (a.k.a. "OEM") codepage, which is
367 ;; different from the default system (a.k.a. "ANSI")
369 (if (eq system-type 'windows-nt)
370 (intern (format "cp%d" (w32-get-console-output-codepage)))
371 coding-system-for-read)))
374 (setq-local net-utils--revert-cmd
375 `(net-utils-run-simple ,(current-buffer)
376 ,program-name ,args nodisplay))
378 (apply 'start-process program-name
379 (current-buffer) program-name args)
380 'net-utils-remove-ctrl-m-filter)
381 (unless nodisplay (display-buffer (current-buffer)))))
383 (defun net-utils--revert-function (&optional ignore-auto noconfirm)
384 (message "Reverting `%s'..." (buffer-name))
385 (apply (car net-utils--revert-cmd) (cdr net-utils--revert-cmd))
386 (let ((proc (get-buffer-process (current-buffer))))
388 (set-process-sentinel
390 (lambda (process event)
391 (when (string= event "finished\n")
392 (message "Reverting `%s' done" (process-buffer process))))))))
396 "Run ifconfig and display diagnostic output."
398 (net-utils-run-simple
399 (format "*%s*" ifconfig-program)
401 ifconfig-program-options))
403 (defalias 'ipconfig 'ifconfig)
407 "Run iwconfig and display diagnostic output."
409 (net-utils-run-simple
410 (format "*%s*" iwconfig-program)
412 iwconfig-program-options))
416 "Run netstat and display diagnostic output."
418 (net-utils-run-simple
419 (format "*%s*" netstat-program)
421 netstat-program-options))
425 "Run arp and display diagnostic output."
427 (net-utils-run-simple
428 (format "*%s*" arp-program)
430 arp-program-options))
434 "Run route and display diagnostic output."
436 (net-utils-run-simple
437 (format "*%s*" route-program)
439 route-program-options))
441 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
442 ;; Wrappers for external network programs
443 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
446 (defun traceroute (target)
447 "Run traceroute program for TARGET."
448 (interactive "sTarget: ")
450 (if traceroute-program-options
451 (append traceroute-program-options (list target))
453 (net-utils-run-simple
454 (concat "Traceroute" " " target)
461 If your system's ping continues until interrupted, you can try setting
462 `ping-program-options'."
464 (list (read-from-minibuffer "Ping host: " (net-utils-machine-at-point))))
466 (if ping-program-options
467 (append ping-program-options (list host))
469 (net-utils-run-program
470 (concat "Ping" " " host)
471 (concat "** Ping ** " ping-program " ** " host)
475 ;; FIXME -- Needs to be a process filter
476 ;; (defun netstat-with-filter (filter)
477 ;; "Run netstat program."
478 ;; (interactive "sFilter: ")
480 ;; (set-buffer (get-buffer "*Netstat*"))
481 ;; (goto-char (point-min))
482 ;; (delete-matching-lines filter))
485 (defun nslookup-host (host)
486 "Lookup the DNS information for HOST."
488 (list (read-from-minibuffer "Lookup host: " (net-utils-machine-at-point))))
490 (if nslookup-program-options
491 (append nslookup-program-options (list host))
493 (net-utils-run-program
497 (list "Nslookup" host nslookup-program)
504 "Run nslookup program."
506 (switch-to-buffer (make-comint "nslookup" nslookup-program))
509 (defvar comint-prompt-regexp)
510 (defvar comint-input-autoexpand)
512 (autoload 'comint-mode "comint" nil t)
514 (defvar nslookup-mode-map
515 (let ((map (make-sparse-keymap)))
516 (define-key map "\t" 'completion-at-point)
519 ;; Using a derived mode gives us keymaps, hooks, etc.
520 (define-derived-mode nslookup-mode comint-mode "Nslookup"
521 "Major mode for interacting with the nslookup program."
523 (make-local-variable 'font-lock-defaults)
524 '((nslookup-font-lock-keywords)))
525 (setq comint-prompt-regexp nslookup-prompt-regexp)
526 (setq comint-input-autoexpand t))
529 (defun dns-lookup-host (host)
530 "Lookup the DNS information for HOST (name or IP address)."
532 (list (read-from-minibuffer "Lookup host: " (net-utils-machine-at-point))))
534 (if dns-lookup-program-options
535 (append dns-lookup-program-options (list host))
537 (net-utils-run-program
538 (concat "DNS Lookup [" host "]")
541 (list "DNS Lookup" host dns-lookup-program)
546 (autoload 'ffap-string-at-point "ffap")
549 (defun run-dig (host)
553 (read-from-minibuffer "Lookup host: "
554 (or (ffap-string-at-point 'machine) ""))))
555 (net-utils-run-program
559 (list "Dig" host dig-program)
564 (autoload 'comint-exec "comint")
566 ;; This is a lot less than ange-ftp, but much simpler.
572 (read-from-minibuffer
573 "Ftp to Host: " (net-utils-machine-at-point))))
574 (let ((buf (get-buffer-create (concat "*ftp [" host "]*"))))
577 (comint-exec buf (concat "ftp-" host) ftp-program nil
578 (if ftp-program-options
579 (append (list host) ftp-program-options)
581 (pop-to-buffer buf)))
584 (let ((map (make-sparse-keymap)))
585 ;; Occasionally useful
586 (define-key map "\t" 'completion-at-point)
589 (define-derived-mode ftp-mode comint-mode "FTP"
590 "Major mode for interacting with the ftp program."
591 (setq comint-prompt-regexp ftp-prompt-regexp)
592 (setq comint-input-autoexpand t)
593 ;; Only add the password-prompting hook if it's not already in the
594 ;; global hook list. This stands a small chance of losing, if it's
595 ;; later removed from the global list (very small, since any
596 ;; password prompts will probably immediately follow the initial
597 ;; connection), but it's better than getting prompted twice for the
599 (unless (memq 'comint-watch-for-password-prompt
600 (default-value 'comint-output-filter-functions))
601 (add-hook 'comint-output-filter-functions 'comint-watch-for-password-prompt
604 (defun smbclient (host service)
605 "Connect to SERVICE on HOST via SMB."
608 (read-from-minibuffer
609 "Connect to Host: " (net-utils-machine-at-point))
610 (read-from-minibuffer "SMB Service: ")))
611 (let* ((name (format "smbclient [%s\\%s]" host service))
612 (buf (get-buffer-create (concat "*" name "*")))
613 (service-name (concat "\\\\" host "\\" service)))
616 (comint-exec buf name smbclient-program nil
617 (if smbclient-program-options
618 (append (list service-name) smbclient-program-options)
619 (list service-name)))
620 (pop-to-buffer buf)))
622 (defun smbclient-list-shares (host)
623 "List services on HOST."
626 (read-from-minibuffer
627 "Connect to Host: " (net-utils-machine-at-point))))
628 (let ((buf (get-buffer-create (format "*SMB Shares on %s*" host))))
631 (comint-exec buf "smbclient-list-shares"
632 smbclient-program nil (list "-L" host))
633 (pop-to-buffer buf)))
635 (define-derived-mode smbclient-mode comint-mode "smbclient"
636 "Major mode for interacting with the smbclient program."
637 (setq comint-prompt-regexp smbclient-prompt-regexp)
638 (setq comint-input-autoexpand t)
639 ;; Only add the password-prompting hook if it's not already in the
640 ;; global hook list. This stands a small chance of losing, if it's
641 ;; later removed from the global list (very small, since any
642 ;; password prompts will probably immediately follow the initial
643 ;; connection), but it's better than getting prompted twice for the
645 (unless (memq 'comint-watch-for-password-prompt
646 (default-value 'comint-output-filter-functions))
647 (add-hook 'comint-output-filter-functions 'comint-watch-for-password-prompt
651 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
652 ;; Network Connections
653 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
655 ;; Full list is available at:
656 ;; http://www.iana.org/assignments/port-numbers
657 (defvar network-connection-service-alist
660 (cons 'active-users 11)
676 (cons 'netbios-name 137)
677 (cons 'netbios-data 139)
681 "Alist of services and associated TCP port numbers.
682 This list is not complete.")
685 (defun run-network-program (process-name host port &optional initial-string)
686 (let ((tcp-connection)
688 (setq buf (get-buffer-create (concat "*" process-name "*")))
692 (open-network-stream process-name buf host port))
693 (error "Could not open connection to %s" host))
695 (set-marker (process-mark tcp-connection) (point-min))
696 (set-process-filter tcp-connection 'net-utils-remove-ctrl-m-filter)
698 (process-send-string tcp-connection
699 (concat initial-string "\r\n")))
700 (display-buffer buf)))
702 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
704 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
706 (defcustom finger-X.500-host-regexps nil
707 "A list of regular expressions matching host names.
708 If a host name passed to `finger' matches one of these regular
709 expressions, it is assumed to be a host that doesn't accept
710 queries of the form USER@HOST, and wants a query containing USER only."
712 :type '(repeat regexp)
717 (defun finger (user host)
718 "Finger USER on HOST."
719 ;; One of those great interactive statements that's actually
720 ;; longer than the function call! The idea is that if the user
721 ;; uses a string like "pbreton@cs.umb.edu", we won't ask for the
722 ;; host name. If we don't see an "@", we'll prompt for the host.
724 (let* ((answer (read-from-minibuffer "Finger User: "
725 (net-utils-url-at-point)))
726 (index (string-match (regexp-quote "@") answer)))
728 (list (substring answer 0 index)
729 (substring answer (1+ index)))
731 (read-from-minibuffer "At Host: "
732 (net-utils-machine-at-point))))))
733 (let* ((user-and-host (concat user "@" host))
734 (process-name (concat "Finger [" user-and-host "]"))
735 (regexps finger-X.500-host-regexps)
738 (while (not (string-match (car regexps) host))
739 (setq regexps (cdr regexps)))
741 (setq user-and-host user)))
745 (cdr (assoc 'finger network-connection-service-alist))
748 (defcustom whois-server-name "rs.internic.net"
749 "Default host name for the whois service."
753 (defcustom whois-server-list
754 '(("whois.arin.net") ; Networks, ASN's, and related POC's (numbers)
755 ("rs.internic.net") ; domain related info
756 ("whois.publicinterestregistry.net")
763 "A list of whois servers that can be queried."
765 :type '(repeat (list string)))
767 ;; FIXME: modern whois clients include a much better tld <-> whois server
768 ;; list, Emacs should probably avoid specifying the server as the client
769 ;; will DTRT anyway... -rfr
770 (defcustom whois-server-tld
771 '(("rs.internic.net" . "com")
772 ("whois.publicinterestregistry.net" . "org")
773 ("whois.ripe.net" . "be")
774 ("whois.ripe.net" . "de")
775 ("whois.ripe.net" . "dk")
776 ("whois.ripe.net" . "it")
777 ("whois.ripe.net" . "fi")
778 ("whois.ripe.net" . "fr")
779 ("whois.ripe.net" . "uk")
780 ("whois.apnic.net" . "au")
781 ("whois.apnic.net" . "ch")
782 ("whois.apnic.net" . "hk")
783 ("whois.apnic.net" . "jp")
784 ("whois.nic.gov" . "gov")
785 ("whois.nic.mil" . "mil"))
786 "Alist to map top level domains to whois servers."
788 :type '(repeat (cons string string)))
790 (defcustom whois-guess-server t
791 "If non-nil then whois will try to deduce the appropriate whois
792 server from the query. If the query doesn't look like a domain or hostname
793 then the server named by `whois-server-name' is used."
797 (defun whois-get-tld (host)
798 "Return the top level domain of `host', or nil if it isn't a domain name."
799 (let ((i (1- (length host)))
800 (max-len (- (length host) 5)))
801 (while (not (or (= i max-len) (char-equal (aref host i) ?.)))
805 (substring host (1+ i)))))
809 (defun whois (arg search-string)
810 "Send SEARCH-STRING to server defined by the `whois-server-name' variable.
811 If `whois-guess-server' is non-nil, then try to deduce the correct server
812 from SEARCH-STRING. With argument, prompt for whois server."
813 (interactive "P\nsWhois: ")
814 (let* ((whois-apropos-host (if whois-guess-server
815 (rassoc (whois-get-tld search-string)
818 (server-name (if whois-apropos-host
819 (car whois-apropos-host)
823 (completing-read "Whois server name: "
824 whois-server-list nil nil "whois.")
829 (cdr (assoc 'whois network-connection-service-alist))
832 (defcustom whois-reverse-lookup-server "whois.arin.net"
833 "Server which provides inverse DNS mapping."
838 (defun whois-reverse-lookup ()
840 (let ((whois-server-name whois-reverse-lookup-server))
841 (call-interactively 'whois)))
843 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
844 ;;; General Network connection
845 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
847 ;; Using a derived mode gives us keymaps, hooks, etc.
849 network-connection-mode comint-mode "Network-Connection"
850 "Major mode for interacting with the network-connection program.")
852 (defun network-connection-mode-setup (host service)
853 (make-local-variable 'network-connection-host)
854 (setq network-connection-host host)
855 (make-local-variable 'network-connection-service)
856 (setq network-connection-service service))
859 (defun network-connection-to-service (host service)
860 "Open a network connection to SERVICE on HOST."
863 (read-from-minibuffer "Host: " (net-utils-machine-at-point))
864 (completing-read "Service: "
868 (list (symbol-name (car elt)))))
869 network-connection-service-alist))))
872 (cdr (assoc (intern service) network-connection-service-alist))))
875 (defun network-connection (host port)
876 "Open a network connection to HOST on PORT."
877 (interactive "sHost: \nnPort: ")
878 (network-service-connection host (number-to-string port)))
880 (defun network-service-connection (host service)
881 "Open a network connection to SERVICE on HOST."
882 (let* ((process-name (concat "Network Connection [" host " " service "]"))
883 (portnum (string-to-number service))
884 (buf (get-buffer-create (concat "*" process-name "*"))))
885 (or (zerop portnum) (setq service portnum))
890 (network-connection-mode)
891 (network-connection-mode-setup host service)
892 (pop-to-buffer buf)))
894 (defvar comint-input-ring)
896 (defun network-connection-reconnect ()
897 "Reconnect a network connection, preserving the old input ring."
899 (let ((proc (get-buffer-process (current-buffer)))
900 (old-comint-input-ring comint-input-ring)
901 (host network-connection-host)
902 (service network-connection-service))
903 (if (not (or (not proc)
904 (eq (process-status proc) 'closed)))
905 (message "Still connected")
906 (goto-char (point-max))
907 (insert (format "Reopening connection to %s\n" host))
908 (network-connection host
909 (if (numberp service)
911 (cdr (assoc service network-connection-service-alist))))
912 (and old-comint-input-ring
913 (setq comint-input-ring old-comint-input-ring)))))
917 ;;; net-utils.el ends here