- (when (>= i 32)
- (error "Host index ~D out of range for network ~A"
- host (ipnet-pretty ipn)))
- (cond ((zerop h)
- (return a))
- ((logbitp i mask)
- (setf h (ash h 1)))
- (t
- (setf a (logior a (logand m h)))
- (setf h (logandc2 h m))))
- (setf m (ash m 1))
- (incf i)))))
-
-(defun ipaddr-networkp (ip ipn)
- "Returns true if address IP is within network IPN."
- (with-ipnet (net mask) ipn
- (= net (logand ip mask))))
-
-(defun ipnet-subnetp (ipn subn)
- "Returns true if SUBN is a (non-strict) subnet of IPN."
- (with-ipnet (net mask) ipn
- (with-ipnet (subnet submask) subn
- (and (= net (logand subnet mask))
- (= submask (logior mask submask))))))
-
-(defun ipnet-changeable-bytes (mask)
- "Answers how many low-order bytes of MASK are (entirely or partially)
-changeable. This is used when constructing reverse zones."
- (dotimes (i 4 4)
- (when (/= (ipaddr-byte mask i) 255)
- (return (- 4 i)))))
-
-;;;--------------------------------------------------------------------------
-;;; Name resolution.
-
-#+cmu
-(defun resolve-hostname (name)
- "Resolve a hostname to an IP address using the DNS, or return nil."
- (let ((he (ext:lookup-host-entry name)))
- (and he
- (ext:host-entry-addr he))))
-
-#+cmu
-(defun canonify-hostname (name)
- "Resolve a hostname to canonical form using the DNS, or return nil."
- (let ((he (ext:lookup-host-entry name)))
- (and he
- (ext:host-entry-name he))))
-
-;;;--------------------------------------------------------------------------
-;;; Host names and specifiers.
-
-(defun parse-ipaddr (addr)
- "Convert the string ADDR into an IP address: tries all sorts of things:
-
- (NET [INDEX]) -- index a network: NET is a network name defined by defnet;
- INDEX is an index or one of the special symbols understood by net-host,
- and defaults to :next
- INTEGER -- an integer IP address
- IPADDR -- an IP address in dotted-quad form
- HOST -- a host name defined by defhost
- DNSNAME -- a name string to look up in the DNS"
- (cond ((listp addr)
- (destructuring-bind
- (net host)
- (pairify addr :next)
- (net-host (or (net-find net)
- (error "Network ~A not found" net))
- host)))
- ((ipaddrp addr) addr)
- (t
- (setf addr (string-downcase (stringify addr)))
- (or (host-find addr)
- (and (plusp (length addr))
- (digit-char-p (char addr 0))
- (string-ipaddr addr))
- (resolve-hostname (stringify addr))
- (error "Host name ~A unresolvable" addr)))))
-
-(defvar *hosts* (make-hash-table :test #'equal)
- "The table of known hostnames.")
-
-(defun host-find (name)
- "Find a host by NAME."
- (gethash (string-downcase (stringify name)) *hosts*))
-
-(defun (setf host-find) (addr name)
- "Make NAME map to ADDR (must be an ipaddr in integer form)."
- (setf (gethash (string-downcase (stringify name)) *hosts*) addr))
-
-(defun host-create (name addr)
- "Make host NAME map to ADDR (anything acceptable to parse-ipaddr)."
- (setf (host-find name) (parse-ipaddr addr)))
-
-(defmacro defhost (name addr)
- "Main host definition macro. Neither NAME nor ADDR is evaluated."
- `(progn
- (host-create ',name ',addr)
- ',name))
-
-;;;--------------------------------------------------------------------------
-;;; Network names and specifiers.
-
-(defstruct (net (:predicate netp))
- "A network structure. Slots:
-
-NAME The network's name, as a string
-IPNET The network base address and mask
-HOSTS Number of hosts in the network
-NEXT Index of the next unassigned host"
- name
- ipnet
- hosts
- next)
-
-(defvar *networks* (make-hash-table :test #'equal)
- "The table of known networks.")
-
-(defun net-find (name)
- "Find a network by NAME."
- (gethash (string-downcase (stringify name)) *networks*))
-
-(defun (setf net-find) (net name)
- "Make NAME map to NET."
- (setf (gethash (string-downcase (stringify name)) *networks*) net))
-
-(defun net-get-as-ipnet (form)
- "Transform FORM into an ipnet. FORM may be a network name, or something
-acceptable to the ipnet function."
- (let ((net (net-find form)))
- (if net (net-ipnet net)
- (ipnet form))))
-
-(defun net-create (name &rest args)
- "Construct a new network called NAME and add it to the map. The ARGS
-describe the new network, in a form acceptable to the ipnet function."
- (let ((ipn (apply #'ipnet args)))
- (setf (net-find name)
- (make-net :name (string-downcase (stringify name))
- :ipnet ipn
- :hosts (ipnet-hosts ipn)
- :next 1))))
-
-(defmacro defnet (name &rest args)
- "Main network definition macro. Neither NAME nor any of the ARGS is
-evaluated."
- `(progn
- (net-create ',name ,@(mapcar (lambda (x) `',x) args))
- ',name))
-
-(defun net-next-host (net)
- "Given a NET, return the IP address (as integer) of the next available
-address in the network."
- (unless (< (net-next net) (net-hosts net))
- (error "No more hosts left in network ~A" (net-name net)))
- (let ((next (net-next net)))
- (incf (net-next net))
- (net-host net next)))
-
-(defun net-host (net host)
- "Return the given HOST on the NEXT. HOST may be an index (in range, of
-course), or one of the keywords:
-:NEXT next host, as by net-next-host
-:NET network base address
-:BROADCAST network broadcast address"
- (case host
- (:next (net-next-host net))
- (:net (ipnet-net (net-ipnet net)))
- (:broadcast (ipnet-broadcast (net-ipnet net)))
- (t (ipnet-host (net-ipnet net) host))))
+ (let ((end (read-sequence buf in :start pos)))
+ (when (< end (length buf))
+ (return (adjust-array buf end)))
+ (setf pos end
+ buf (adjust-array buf (* 2 pos))))))))
+
+(defmacro defenum (name (&key export) &body values)
+ "Set up symbol properties for manifest constants.
+
+ The VALUES are a list of (TAG VALUE) pairs. Each TAG is a symbol; we set
+ the NAME property on TAG to VALUE, and export TAG. There are also handy
+ hash-tables mapping in the forward and reverse directions, in the name
+ symbol's `enum-forward' and `enum-reverse' properties."
+ `(eval-when (:compile-toplevel :load-toplevel :execute)
+ ,(let*/gensyms (export)
+ (with-gensyms (forward reverse valtmp)
+ `(let ((,forward (make-hash-table))
+ (,reverse (make-hash-table)))
+ (when ,export (export ',name))
+ ,@(mapcar (lambda (item)
+ (destructuring-bind (tag value) item
+ (let ((constant
+ (intern (concatenate 'string
+ (symbol-name name)
+ "/"
+ (symbol-name tag)))))
+ `(let ((,valtmp ,value))
+ (when ,export
+ (export ',constant)
+ (when (eq (symbol-package ',tag) *package*)
+ (export ',tag)))
+ (defconstant ,constant ,valtmp)
+ (setf (get ',tag ',name) ,value
+ (gethash ',tag ,forward) ,valtmp
+ (gethash ,valtmp ,reverse) ',tag)))))
+ values)
+ (setf (get ',name 'enum-forward) ,forward
+ (get ',name 'enum-reverse) ,reverse))))))
+
+(defun lookup-enum (name tag &key min max)
+ "Look up a TAG in an enumeration.
+
+ If TAG is a symbol, check its NAME property; if it's a fixnum then take it
+ as it is. Make sure that it's between MIN and MAX, if they're not nil."
+ (let ((value (etypecase tag
+ (fixnum tag)
+ (symbol (or (get tag name)
+ (error "~S is not a known ~A" tag name))))))
+ (unless (and (or (null min) (<= min value))
+ (or (null max) (<= value max)))
+ (error "Value ~S out of range for ~A" value name))
+ value))
+
+(defun reverse-enum (name value)
+ "Reverse-lookup of a VALUE in enumeration NAME.
+
+ If a tag for the VALUE is found, return it and `t'; otherwise return VALUE
+ unchanged and `nil'."
+ (multiple-value-bind (tag foundp) (gethash value (get name 'enum-reverse))
+ (if foundp
+ (values tag t)
+ (values value nil))))
+
+(defun mapenum (func name)
+ "Call FUNC on TAG/VALUE pairs from the enumeration called NAME."
+ (maphash func (get name 'enum-forward)))
+
+(defun hash-file (hash file context)
+ "Hash the FILE using the OpenSSL HASH function, returning an octet string.
+
+ CONTEXT is a temporary-files context."
+ (let ((temp (temporary-file context "hash")))
+ (run-program (list "openssl" "dgst" (concatenate 'string "-" hash))
+ :input file :output temp)
+ (with-open-file (in temp)
+ (let ((line (read-line in)))
+ (assert (and (>= (length line) 9)
+ (string= line "(stdin)= " :end1 9)))
+ (decode-hex line :start 9)))))
~mdw / zone / blobdiff