/usr/share/emacs/site-lisp/elpa-src/jabber-0.8.92/jabber-conn.el is in elpa-jabber 0.8.92+git98dc8e-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 2005 - Georg Lehner - jorge@magma.com.ni
;; mostly inspired by Gnus.
;; Copyright (C) 2005 - Carl Henrik Lunde - chlunde+jabber+@ping.uio.no
;; (starttls)
;; This file is a part of jabber.el.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, write to the Free Software
;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;; A collection of functions, that hide the details of transmitting to
;; and fro a Jabber Server
(eval-when-compile (require 'cl))
;; Emacs 24 can be linked with GnuTLS
(ignore-errors (require 'gnutls))
;; Try two different TLS/SSL libraries, but don't fail if none available.
(or (ignore-errors (require 'tls))
(ignore-errors (require 'ssl)))
(ignore-errors (require 'starttls))
(require 'srv)
(defgroup jabber-conn nil "Jabber Connection Settings"
:group 'jabber)
(defun jabber-have-starttls ()
"Return true if we can use STARTTLS."
(or (and (fboundp 'gnutls-available-p)
(gnutls-available-p))
(and (featurep 'starttls)
(or (and (bound-and-true-p starttls-gnutls-program)
(executable-find starttls-gnutls-program))
(and (bound-and-true-p starttls-program)
(executable-find starttls-program))))))
(defconst jabber-default-connection-type
(cond
;; Use STARTTLS if we can...
((jabber-have-starttls)
'starttls)
;; ...else default to unencrypted connection.
(t
'network))
"Default connection type.
See `jabber-connect-methods'.")
(defcustom jabber-connection-ssl-program nil
"Program used for SSL/TLS connections.
nil means prefer gnutls but fall back to openssl.
'gnutls' means use gnutls (through `open-tls-stream').
'openssl means use openssl (through `open-ssl-stream')."
:type '(choice (const :tag "Prefer gnutls, fall back to openssl" nil)
(const :tag "Use gnutls" gnutls)
(const :tag "Use openssl" openssl))
:group 'jabber-conn)
(defcustom jabber-invalid-certificate-servers ()
"Jabber servers for which we accept invalid TLS certificates.
This is a list of server names, each matching the hostname part
of your JID.
This option has effect only when using native GnuTLS in Emacs 24
or later."
:type '(repeat string)
:group 'jabber-conn)
(defvar jabber-connect-methods
`((network jabber-network-connect jabber-network-send)
(starttls
,(if (and (fboundp 'gnutls-available-p)
(gnutls-available-p))
;; With "native" TLS, we can use a normal connection.
'jabber-network-connect
'jabber-starttls-connect)
jabber-network-send)
(ssl jabber-ssl-connect jabber-ssl-send)
(virtual jabber-virtual-connect jabber-virtual-send))
"Alist of connection methods and functions.
First item is the symbol naming the method.
Second item is the connect function.
Third item is the send function.")
(defun jabber-get-connect-function (type)
"Get the connect function associated with TYPE.
TYPE is a symbol; see `jabber-connection-type'."
(let ((entry (assq type jabber-connect-methods)))
(nth 1 entry)))
(defun jabber-get-send-function (type)
"Get the send function associated with TYPE.
TYPE is a symbol; see `jabber-connection-type'."
(let ((entry (assq type jabber-connect-methods)))
(nth 2 entry)))
(defun jabber-srv-targets (server network-server port)
"Find host and port to connect to.
If NETWORK-SERVER and/or PORT are specified, use them.
If we can't find SRV records, use standard defaults."
;; If the user has specified a host or a port, obey that.
(if (or network-server port)
(list (cons (or network-server server)
(or port 5222)))
(or (condition-case nil
(srv-lookup (concat "_xmpp-client._tcp." server))
(error nil))
(list (cons server 5222)))))
;; Plain TCP/IP connection
(defun jabber-network-connect (fsm server network-server port)
"Connect to a Jabber server with a plain network connection.
Send a message of the form (:connected CONNECTION) to FSM if
connection succeeds. Send a message (:connection-failed ERRORS) if
connection fails."
(cond
((featurep 'make-network-process '(:nowait t))
;; We can connect asynchronously!
(jabber-network-connect-async fsm server network-server port))
(t
;; Connecting to the server will block Emacs.
(jabber-network-connect-sync fsm server network-server port))))
(defun jabber-network-connect-async (fsm server network-server port)
;; Get all potential targets...
(lexical-let ((targets (jabber-srv-targets server network-server port))
errors
(fsm fsm))
;; ...and connect to them one after another, asynchronously, until
;; connection succeeds.
(labels
((connect
(target remaining-targets)
(lexical-let ((target target) (remaining-targets remaining-targets))
(labels ((connection-successful
(c)
;; This mustn't be `fsm-send-sync', because the FSM
;; needs to change the sentinel, which cannot be done
;; from inside the sentinel.
(fsm-send fsm (list :connected c)))
(connection-failed
(c status)
(when (and (> (length status) 0)
(eq (aref status (1- (length status))) ?\n))
(setq status (substring status 0 -1)))
(let ((err
(format "Couldn't connect to %s:%s: %s"
(car target) (cdr target) status)))
(message "%s" err)
(push err errors))
(when c (delete-process c))
(if remaining-targets
(progn
(message
"Connecting to %s:%s..."
(caar remaining-targets) (cdar remaining-targets))
(connect (car remaining-targets) (cdr remaining-targets)))
(fsm-send fsm (list :connection-failed (nreverse errors))))))
(condition-case e
(make-network-process
:name "jabber"
:buffer (generate-new-buffer jabber-process-buffer)
:host (car target) :service (cdr target)
:coding 'utf-8
:nowait t
:sentinel
(lexical-let ((target target) (remaining-targets remaining-targets))
(lambda (connection status)
(cond
((string-match "^open" status)
(connection-successful connection))
((string-match "^failed" status)
(connection-failed connection status))
((string-match "^deleted" status)
;; This happens when we delete a process in the
;; "failed" case above.
nil)
(t
(message "Unknown sentinel status `%s'" status))))))
(file-error
;; A file-error has the error message in the third list
;; element.
(connection-failed nil (car (cddr e))))
(error
;; Not sure if we ever get anything but file-errors,
;; but let's make sure we report them:
(connection-failed nil (error-message-string e))))))))
(message "Connecting to %s:%s..." (caar targets) (cdar targets))
(connect (car targets) (cdr targets)))))
(defun jabber-network-connect-sync (fsm server network-server port)
;; This code will AFAIK only be used on Windows. Apologies in
;; advance for any bit rot...
(let ((coding-system-for-read 'utf-8)
(coding-system-for-write 'utf-8)
(targets (jabber-srv-targets server network-server port))
errors)
(catch 'connected
(dolist (target targets)
(condition-case e
(let ((process-buffer (generate-new-buffer jabber-process-buffer))
connection)
(unwind-protect
(setq connection (open-network-stream
"jabber"
process-buffer
(car target)
(cdr target)))
(unless (or connection jabber-debug-keep-process-buffers)
(kill-buffer process-buffer)))
(when connection
(fsm-send fsm (list :connected connection))
(throw 'connected connection)))
(file-error
;; A file-error has the error message in the third list
;; element.
(let ((err (format "Couldn't connect to %s:%s: %s"
(car target) (cdr target)
(car (cddr e)))))
(message "%s" err)
(push err errors)))
(error
;; Not sure if we ever get anything but file-errors,
;; but let's make sure we report them:
(let ((err (format "Couldn't connect to %s:%s: %s"
(car target) (cdr target)
(error-message-string e))))
(message "%s" err)
(push err errors)))))
(fsm-send fsm (list :connection-failed (nreverse errors))))))
(defun jabber-network-send (connection string)
"Send a string via a plain TCP/IP connection to the Jabber Server."
(process-send-string connection string))
;; SSL connection, we use openssl's s_client function for encryption
;; of the link
;; TODO: make this configurable
(defun jabber-ssl-connect (fsm server network-server port)
"connect via OpenSSL or GnuTLS to a Jabber Server
Send a message of the form (:connected CONNECTION) to FSM if
connection succeeds. Send a message (:connection-failed ERRORS) if
connection fails."
(let ((coding-system-for-read 'utf-8)
(coding-system-for-write 'utf-8)
(connect-function
(cond
((and (memq jabber-connection-ssl-program '(nil gnutls))
(fboundp 'open-tls-stream))
'open-tls-stream)
((and (memq jabber-connection-ssl-program '(nil openssl))
(fboundp 'open-ssl-stream))
'open-ssl-stream)
(t
(error "Neither TLS nor SSL connect functions available"))))
error-msg)
(let ((process-buffer (generate-new-buffer jabber-process-buffer))
connection)
(setq network-server (or network-server server))
(setq port (or port 5223))
(condition-case e
(setq connection (funcall connect-function
"jabber"
process-buffer
network-server
port))
(error
(setq error-msg
(format "Couldn't connect to %s:%d: %s" network-server port
(error-message-string e)))
(message "%s" error-msg)))
(unless (or connection jabber-debug-keep-process-buffers)
(kill-buffer process-buffer))
(if connection
(fsm-send fsm (list :connected connection))
(fsm-send fsm (list :connection-failed
(when error-msg (list error-msg))))))))
(defun jabber-ssl-send (connection string)
"Send a string via an SSL-encrypted connection to the Jabber Server."
;; It seems we need to send a linefeed afterwards.
(process-send-string connection string)
(process-send-string connection "\n"))
(defun jabber-starttls-connect (fsm server network-server port)
"Connect via an external GnuTLS process to a Jabber Server.
Send a message of the form (:connected CONNECTION) to FSM if
connection succeeds. Send a message (:connection-failed ERRORS) if
connection fails."
(let ((coding-system-for-read 'utf-8)
(coding-system-for-write 'utf-8)
(targets (jabber-srv-targets server network-server port))
errors)
(unless (fboundp 'starttls-open-stream)
(error "starttls.el not available"))
(catch 'connected
(dolist (target targets)
(condition-case e
(let ((process-buffer (generate-new-buffer jabber-process-buffer))
connection)
(unwind-protect
(setq connection
(starttls-open-stream
"jabber"
process-buffer
(car target)
(cdr target)))
(unless (or connection jabber-debug-keep-process-buffers)
(kill-buffer process-buffer)))
(if (null connection)
;; It seems we don't actually get an error if we
;; can't connect. Let's try to convey some useful
;; information to the user at least.
(let ((err (format "Couldn't connect to %s:%s"
(car target) (cdr target))))
(message "%s" err)
(push err errors))
(fsm-send fsm (list :connected connection))
(throw 'connected connection)))
(error
(let ((err (format "Couldn't connect to %s: %s" target
(error-message-string e))))
(message "%s" err)
(push err errors)))))
(fsm-send fsm (list :connection-failed (nreverse errors))))))
(defun jabber-starttls-initiate (fsm)
"Initiate a starttls connection"
(jabber-send-sexp fsm
'(starttls ((xmlns . "urn:ietf:params:xml:ns:xmpp-tls")))))
(defun jabber-starttls-process-input (fsm xml-data)
"Process result of starttls request.
On failure, signal error."
(cond
((eq (car xml-data) 'proceed)
(let* ((state-data (fsm-get-state-data fsm))
(connection (plist-get state-data :connection)))
;; Did we use open-network-stream or starttls-open-stream? We
;; can tell by process-type.
(case (process-type connection)
(network
(let* ((hostname (plist-get state-data :server))
(verifyp (not (member hostname jabber-invalid-certificate-servers))))
;; gnutls-negotiate might signal an error, which is caught
;; by our caller
(gnutls-negotiate
:process connection
;; This is the hostname that the certificate should be valid for:
:hostname hostname
:verify-hostname-error verifyp
:verify-error verifyp)))
(real
(or
(starttls-negotiate connection)
(error "Negotiation failure"))))))
((eq (car xml-data) 'failure)
(error "Command rejected by server"))))
(defvar *jabber-virtual-server-function* nil
"Function to use for sending stanzas on a virtual connection.
The function should accept two arguments, the connection object
and a string that the connection wants to send.")
(defun jabber-virtual-connect (fsm server network-server port)
"Connect to a virtual \"server\".
Use `*jabber-virtual-server-function*' as send function."
(unless (functionp *jabber-virtual-server-function*)
(error "No virtual server function specified"))
;; We pass the fsm itself as "connection object", as that is what a
;; virtual server needs to send stanzas.
(fsm-send fsm (list :connected fsm)))
(defun jabber-virtual-send (connection string)
(funcall *jabber-virtual-server-function* connection string))
(provide 'jabber-conn)
;; arch-tag: f95ec240-8cd3-11d9-9dbf-000a95c2fcd0
|