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