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470 lines
11 KiB
Go
470 lines
11 KiB
Go
package mssql
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import (
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"fmt"
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"net"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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"unicode"
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)
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const defaultServerPort = 1433
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type connectParams struct {
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logFlags uint64
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port uint64
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host string
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instance string
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database string
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user string
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password string
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dial_timeout time.Duration
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conn_timeout time.Duration
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keepAlive time.Duration
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encrypt bool
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disableEncryption bool
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trustServerCertificate bool
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certificate string
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hostInCertificate string
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hostInCertificateProvided bool
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serverSPN string
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workstation string
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appname string
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typeFlags uint8
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failOverPartner string
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failOverPort uint64
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packetSize uint16
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}
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func parseConnectParams(dsn string) (connectParams, error) {
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var p connectParams
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var params map[string]string
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if strings.HasPrefix(dsn, "odbc:") {
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parameters, err := splitConnectionStringOdbc(dsn[len("odbc:"):])
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if err != nil {
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return p, err
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}
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params = parameters
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} else if strings.HasPrefix(dsn, "sqlserver://") {
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parameters, err := splitConnectionStringURL(dsn)
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if err != nil {
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return p, err
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}
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params = parameters
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} else {
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params = splitConnectionString(dsn)
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}
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strlog, ok := params["log"]
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if ok {
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var err error
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p.logFlags, err = strconv.ParseUint(strlog, 10, 64)
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if err != nil {
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return p, fmt.Errorf("Invalid log parameter '%s': %s", strlog, err.Error())
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}
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}
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server := params["server"]
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parts := strings.SplitN(server, `\`, 2)
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p.host = parts[0]
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if p.host == "." || strings.ToUpper(p.host) == "(LOCAL)" || p.host == "" {
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p.host = "localhost"
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}
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if len(parts) > 1 {
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p.instance = parts[1]
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}
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p.database = params["database"]
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p.user = params["user id"]
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p.password = params["password"]
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p.port = 0
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strport, ok := params["port"]
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if ok {
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var err error
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p.port, err = strconv.ParseUint(strport, 10, 16)
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if err != nil {
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f := "Invalid tcp port '%v': %v"
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return p, fmt.Errorf(f, strport, err.Error())
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}
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}
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// https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-the-network-packet-size-server-configuration-option
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// Default packet size remains at 4096 bytes
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p.packetSize = 4096
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strpsize, ok := params["packet size"]
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if ok {
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var err error
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psize, err := strconv.ParseUint(strpsize, 0, 16)
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if err != nil {
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f := "Invalid packet size '%v': %v"
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return p, fmt.Errorf(f, strpsize, err.Error())
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}
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// Ensure packet size falls within the TDS protocol range of 512 to 32767 bytes
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// NOTE: Encrypted connections have a maximum size of 16383 bytes. If you request
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// a higher packet size, the server will respond with an ENVCHANGE request to
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// alter the packet size to 16383 bytes.
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p.packetSize = uint16(psize)
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if p.packetSize < 512 {
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p.packetSize = 512
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} else if p.packetSize > 32767 {
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p.packetSize = 32767
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}
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}
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// https://msdn.microsoft.com/en-us/library/dd341108.aspx
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//
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// Do not set a connection timeout. Use Context to manage such things.
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// Default to zero, but still allow it to be set.
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if strconntimeout, ok := params["connection timeout"]; ok {
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timeout, err := strconv.ParseUint(strconntimeout, 10, 64)
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if err != nil {
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f := "Invalid connection timeout '%v': %v"
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return p, fmt.Errorf(f, strconntimeout, err.Error())
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}
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p.conn_timeout = time.Duration(timeout) * time.Second
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}
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p.dial_timeout = 15 * time.Second
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if strdialtimeout, ok := params["dial timeout"]; ok {
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timeout, err := strconv.ParseUint(strdialtimeout, 10, 64)
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if err != nil {
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f := "Invalid dial timeout '%v': %v"
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return p, fmt.Errorf(f, strdialtimeout, err.Error())
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}
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p.dial_timeout = time.Duration(timeout) * time.Second
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}
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// default keep alive should be 30 seconds according to spec:
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// https://msdn.microsoft.com/en-us/library/dd341108.aspx
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p.keepAlive = 30 * time.Second
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if keepAlive, ok := params["keepalive"]; ok {
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timeout, err := strconv.ParseUint(keepAlive, 10, 64)
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if err != nil {
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f := "Invalid keepAlive value '%s': %s"
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return p, fmt.Errorf(f, keepAlive, err.Error())
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}
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p.keepAlive = time.Duration(timeout) * time.Second
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}
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encrypt, ok := params["encrypt"]
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if ok {
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if strings.EqualFold(encrypt, "DISABLE") {
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p.disableEncryption = true
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} else {
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var err error
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p.encrypt, err = strconv.ParseBool(encrypt)
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if err != nil {
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f := "Invalid encrypt '%s': %s"
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return p, fmt.Errorf(f, encrypt, err.Error())
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}
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}
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} else {
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p.trustServerCertificate = true
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}
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trust, ok := params["trustservercertificate"]
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if ok {
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var err error
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p.trustServerCertificate, err = strconv.ParseBool(trust)
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if err != nil {
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f := "Invalid trust server certificate '%s': %s"
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return p, fmt.Errorf(f, trust, err.Error())
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}
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}
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p.certificate = params["certificate"]
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p.hostInCertificate, ok = params["hostnameincertificate"]
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if ok {
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p.hostInCertificateProvided = true
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} else {
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p.hostInCertificate = p.host
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p.hostInCertificateProvided = false
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}
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serverSPN, ok := params["serverspn"]
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if ok {
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p.serverSPN = serverSPN
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} else {
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p.serverSPN = generateSpn(p.host, resolveServerPort(p.port))
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}
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workstation, ok := params["workstation id"]
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if ok {
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p.workstation = workstation
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} else {
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workstation, err := os.Hostname()
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if err == nil {
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p.workstation = workstation
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}
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}
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appname, ok := params["app name"]
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if !ok {
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appname = "go-mssqldb"
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}
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p.appname = appname
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appintent, ok := params["applicationintent"]
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if ok {
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if appintent == "ReadOnly" {
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if p.database == "" {
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return p, fmt.Errorf("Database must be specified when ApplicationIntent is ReadOnly")
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}
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p.typeFlags |= fReadOnlyIntent
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}
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}
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failOverPartner, ok := params["failoverpartner"]
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if ok {
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p.failOverPartner = failOverPartner
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}
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failOverPort, ok := params["failoverport"]
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if ok {
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var err error
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p.failOverPort, err = strconv.ParseUint(failOverPort, 0, 16)
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if err != nil {
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f := "Invalid tcp port '%v': %v"
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return p, fmt.Errorf(f, failOverPort, err.Error())
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}
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}
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return p, nil
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}
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func splitConnectionString(dsn string) (res map[string]string) {
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res = map[string]string{}
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parts := strings.Split(dsn, ";")
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for _, part := range parts {
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if len(part) == 0 {
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continue
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}
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lst := strings.SplitN(part, "=", 2)
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name := strings.TrimSpace(strings.ToLower(lst[0]))
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if len(name) == 0 {
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continue
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}
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var value string = ""
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if len(lst) > 1 {
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value = strings.TrimSpace(lst[1])
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}
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res[name] = value
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}
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return res
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}
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// Splits a URL of the form sqlserver://username:password@host/instance?param1=value¶m2=value
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func splitConnectionStringURL(dsn string) (map[string]string, error) {
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res := map[string]string{}
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u, err := url.Parse(dsn)
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if err != nil {
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return res, err
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}
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if u.Scheme != "sqlserver" {
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return res, fmt.Errorf("scheme %s is not recognized", u.Scheme)
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}
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if u.User != nil {
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res["user id"] = u.User.Username()
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p, exists := u.User.Password()
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if exists {
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res["password"] = p
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}
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}
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host, port, err := net.SplitHostPort(u.Host)
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if err != nil {
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host = u.Host
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}
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if len(u.Path) > 0 {
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res["server"] = host + "\\" + u.Path[1:]
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} else {
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res["server"] = host
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}
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if len(port) > 0 {
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res["port"] = port
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}
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query := u.Query()
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for k, v := range query {
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if len(v) > 1 {
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return res, fmt.Errorf("key %s provided more than once", k)
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}
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res[strings.ToLower(k)] = v[0]
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}
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return res, nil
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}
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// Splits a URL in the ODBC format
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func splitConnectionStringOdbc(dsn string) (map[string]string, error) {
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res := map[string]string{}
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type parserState int
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const (
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// Before the start of a key
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parserStateBeforeKey parserState = iota
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// Inside a key
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parserStateKey
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// Beginning of a value. May be bare or braced
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parserStateBeginValue
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// Inside a bare value
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parserStateBareValue
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// Inside a braced value
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parserStateBracedValue
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// A closing brace inside a braced value.
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// May be the end of the value or an escaped closing brace, depending on the next character
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parserStateBracedValueClosingBrace
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// After a value. Next character should be a semicolon or whitespace.
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parserStateEndValue
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)
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var state = parserStateBeforeKey
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var key string
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var value string
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for i, c := range dsn {
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switch state {
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case parserStateBeforeKey:
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switch {
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case c == '=':
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return res, fmt.Errorf("Unexpected character = at index %d. Expected start of key or semi-colon or whitespace.", i)
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case !unicode.IsSpace(c) && c != ';':
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state = parserStateKey
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key += string(c)
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}
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case parserStateKey:
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switch c {
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case '=':
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key = normalizeOdbcKey(key)
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state = parserStateBeginValue
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case ';':
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// Key without value
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key = normalizeOdbcKey(key)
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res[key] = value
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key = ""
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value = ""
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state = parserStateBeforeKey
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default:
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key += string(c)
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}
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case parserStateBeginValue:
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switch {
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case c == '{':
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state = parserStateBracedValue
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case c == ';':
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// Empty value
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res[key] = value
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key = ""
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state = parserStateBeforeKey
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case unicode.IsSpace(c):
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// Ignore whitespace
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default:
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state = parserStateBareValue
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value += string(c)
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}
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case parserStateBareValue:
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if c == ';' {
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res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
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key = ""
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value = ""
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state = parserStateBeforeKey
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} else {
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value += string(c)
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}
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case parserStateBracedValue:
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if c == '}' {
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state = parserStateBracedValueClosingBrace
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} else {
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value += string(c)
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}
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case parserStateBracedValueClosingBrace:
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if c == '}' {
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// Escaped closing brace
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value += string(c)
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state = parserStateBracedValue
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continue
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}
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// End of braced value
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res[key] = value
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key = ""
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value = ""
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// This character is the first character past the end,
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// so it needs to be parsed like the parserStateEndValue state.
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state = parserStateEndValue
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switch {
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case c == ';':
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state = parserStateBeforeKey
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case unicode.IsSpace(c):
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// Ignore whitespace
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default:
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return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
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}
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case parserStateEndValue:
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switch {
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case c == ';':
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state = parserStateBeforeKey
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case unicode.IsSpace(c):
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// Ignore whitespace
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default:
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return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
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}
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}
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}
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switch state {
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case parserStateBeforeKey: // Okay
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case parserStateKey: // Unfinished key. Treat as key without value.
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key = normalizeOdbcKey(key)
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res[key] = value
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case parserStateBeginValue: // Empty value
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res[key] = value
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case parserStateBareValue:
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res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
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case parserStateBracedValue:
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return res, fmt.Errorf("Unexpected end of braced value at index %d.", len(dsn))
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case parserStateBracedValueClosingBrace: // End of braced value
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res[key] = value
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case parserStateEndValue: // Okay
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}
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return res, nil
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}
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// Normalizes the given string as an ODBC-format key
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func normalizeOdbcKey(s string) string {
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return strings.ToLower(strings.TrimRightFunc(s, unicode.IsSpace))
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}
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func resolveServerPort(port uint64) uint64 {
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if port == 0 {
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return defaultServerPort
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}
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return port
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}
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func generateSpn(host string, port uint64) string {
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return fmt.Sprintf("MSSQLSvc/%s:%d", host, port)
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}
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