forked from xelabs/go-mysqlstack
/
greeting.go
221 lines (182 loc) · 6.17 KB
/
greeting.go
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/*
* go-mysqlstack
* xelabs.org
*
* Copyright (c) XeLabs
* GPL License
*
*/
package proto
import (
"math/rand"
"time"
"github.com/corverroos/go-mysqlstack/sqldb"
"github.com/corverroos/go-mysqlstack/sqlparser/depends/common"
)
// Greeting used for greeting packet.
type Greeting struct {
protocolVersion uint8
Charset uint8
// StatusFlags are the status flags we will base our returned flags on.
// It is only used by the server.
// SERVER_STATUS_AUTOCOMMIT is default.
status uint16
// Capabilities is the current set of features this connection
// is using. It is the features that are both supported by
// the client and the server, and currently in use.
// It is set after the initial handshake.
Capability uint32
ConnectionID uint32
serverVersion string
authPluginName string
Salt []byte
}
// NewGreeting creates a new Greeting.
func NewGreeting(connectionID uint32, serverVersion string) *Greeting {
greeting := &Greeting{
protocolVersion: 10,
serverVersion: serverVersion,
ConnectionID: connectionID,
Capability: DefaultServerCapability,
Charset: sqldb.CharacterSetUtf8,
status: sqldb.SERVER_STATUS_AUTOCOMMIT,
Salt: make([]byte, 20),
}
// Generate the rand salts, range [1, 123].
for i := 0; i < len(greeting.Salt); i++ {
greeting.Salt[i] = byteRand(1, 123)
}
return greeting
}
func byteRand(min int, max int) byte {
rand.Seed(time.Now().UTC().UnixNano())
return byte(min + rand.Intn(max-min))
}
// Status returns status of greeting.
func (g *Greeting) Status() uint16 {
return g.status
}
// Pack used to pack the greeting packet.
// https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::HandshakeV10
func (g *Greeting) Pack() []byte {
// greeting buffer
buf := common.NewBuffer(256)
capLower := uint16(g.Capability)
capUpper := uint16(uint32(g.Capability) >> 16)
// 1: [0a] protocol version
buf.WriteU8(g.protocolVersion)
// string[NUL]: server version
buf.WriteString(g.serverVersion)
buf.WriteZero(1)
// 4: connection id
buf.WriteU32(g.ConnectionID)
// string[8]: auth-plugin-data-part-1
buf.WriteBytes(g.Salt[:8])
// 1: [00] filler
buf.WriteZero(1)
// 2: capability flags (lower 2 bytes)
buf.WriteU16(capLower)
// 1: character set
buf.WriteU8(sqldb.CharacterSetUtf8)
// 2: status flags
buf.WriteU16(g.status)
// 2: capability flags (upper 2 bytes)
buf.WriteU16(capUpper)
// Length of auth plugin data.
// Always 21 (8 + 13).
buf.WriteU8(21)
// string[10]: reserved (all [00])
buf.WriteZero(10)
// string[$len]: auth-plugin-data-part-2 ($len=MAX(13, length of auth-plugin-data - 8))
buf.WriteBytes(g.Salt[8:])
buf.WriteZero(1)
// string[NUL] auth-plugin name
pluginName := "mysql_native_password"
buf.WriteString(pluginName)
buf.WriteZero(1)
return buf.Datas()
}
// UnPack used to unpack the greeting packet.
func (g *Greeting) UnPack(payload []byte) error {
var err error
buf := common.ReadBuffer(payload)
// 1: [0a] protocol version
if g.protocolVersion, err = buf.ReadU8(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting protocol-version failed")
}
// string[NUL]: server version
if g.serverVersion, err = buf.ReadStringNUL(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting server-version failed")
}
// 4: connection id
if g.ConnectionID, err = buf.ReadU32(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting onnection-id failed")
}
// string[8]: auth-plugin-data-part-1
var salt8 []byte
if salt8, err = buf.ReadBytes(8); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting auth-plugin-data-part-1 failed")
}
copy(g.Salt, salt8)
// 1: [00] filler
if err = buf.ReadZero(1); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting filler failed")
}
// 2: capability flags (lower 2 bytes)
var capLower uint16
if capLower, err = buf.ReadU16(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting capability-flags failed")
}
// 1: character set
if g.Charset, err = buf.ReadU8(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting charset failed")
}
// 2: status flags
if g.status, err = buf.ReadU16(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting status-flags failed")
}
// 2: capability flags (upper 2 bytes)
var capUpper uint16
if capUpper, err = buf.ReadU16(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting capability-flags-upper failed")
}
g.Capability = (uint32(capUpper) << 16) | (uint32(capLower))
// 1: length of auth-plugin-data-part-1
var SLEN byte
if (g.Capability & sqldb.CLIENT_PLUGIN_AUTH) > 0 {
if SLEN, err = buf.ReadU8(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting auth-plugin-data length failed")
}
} else {
if err = buf.ReadZero(1); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting zero failed")
}
}
// string[10]: reserved (all [00])
if err = buf.ReadZero(10); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting reserved failed")
}
// string[$len]: auth-plugin-data-part-2 ($len=MAX(13, length of auth-plugin-data - 8))
if (g.Capability & sqldb.CLIENT_SECURE_CONNECTION) > 0 {
read := int(SLEN) - 8
if read < 0 || read > 13 {
read = 13
}
var salt2 []byte
if salt2, err = buf.ReadBytes(read); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting salt2 failed")
}
// The last byte has to be 0, and is not part of the data.
if salt2[read-1] != 0 {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting auth-plugin-data-part-2 is not 0 terminated")
}
copy(g.Salt[8:], salt2[:read-1])
}
// string[NUL] auth-plugin name
if (g.Capability & sqldb.CLIENT_PLUGIN_AUTH) > 0 {
if g.authPluginName, err = buf.ReadStringNUL(); err != nil {
return sqldb.NewSQLError(sqldb.ER_MALFORMED_PACKET, "extracting greeting auth-plugin-name failed")
}
}
return nil
}