Source file src/vendor/golang.org/x/net/route/message.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd netbsd openbsd
     6	
     7	package route
     8	
     9	// A Message represents a routing message.
    10	type Message interface {
    11		// Sys returns operating system-specific information.
    12		Sys() []Sys
    13	}
    14	
    15	// A Sys reprensents operating system-specific information.
    16	type Sys interface {
    17		// SysType returns a type of operating system-specific
    18		// information.
    19		SysType() SysType
    20	}
    21	
    22	// A SysType represents a type of operating system-specific
    23	// information.
    24	type SysType int
    25	
    26	const (
    27		SysMetrics SysType = iota
    28		SysStats
    29	)
    30	
    31	// ParseRIB parses b as a routing information base and returns a list
    32	// of routing messages.
    33	func ParseRIB(typ RIBType, b []byte) ([]Message, error) {
    34		if !typ.parseable() {
    35			return nil, errUnsupportedMessage
    36		}
    37		var msgs []Message
    38		nmsgs, nskips := 0, 0
    39		for len(b) > 4 {
    40			nmsgs++
    41			l := int(nativeEndian.Uint16(b[:2]))
    42			if l == 0 {
    43				return nil, errInvalidMessage
    44			}
    45			if len(b) < l {
    46				return nil, errMessageTooShort
    47			}
    48			if b[2] != sysRTM_VERSION {
    49				b = b[l:]
    50				continue
    51			}
    52			if w, ok := wireFormats[int(b[3])]; !ok {
    53				nskips++
    54			} else {
    55				m, err := w.parse(typ, b)
    56				if err != nil {
    57					return nil, err
    58				}
    59				if m == nil {
    60					nskips++
    61				} else {
    62					msgs = append(msgs, m)
    63				}
    64			}
    65			b = b[l:]
    66		}
    67		// We failed to parse any of the messages - version mismatch?
    68		if nmsgs != len(msgs)+nskips {
    69			return nil, errMessageMismatch
    70		}
    71		return msgs, nil
    72	}
    73	

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