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security_group.go
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security_group.go
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package models
import (
"errors"
"net"
"strings"
)
type ProtocolName string
const (
TCPProtocol ProtocolName = "tcp"
UDPProtocol ProtocolName = "udp"
ICMPProtocol ProtocolName = "icmp"
AllProtocol ProtocolName = "all"
maxPort int = 65535
)
var errInvalidIP = errors.New("Invalid IP")
type PortRange struct {
Start uint16 `json:"start"`
End uint16 `json:"end"`
}
type SecurityGroupRule struct {
Protocol ProtocolName `json:"protocol"`
Destinations []string `json:"destinations"`
Ports []uint16 `json:"ports,omitempty"`
PortRange *PortRange `json:"port_range,omitempty"`
IcmpInfo *ICMPInfo `json:"icmp_info,omitempty"`
Log bool `json:"log"`
}
type ICMPInfo struct {
Type int32 `json:"type"`
Code int32 `json:"code"`
}
func (rule SecurityGroupRule) Validate() error {
var validationError ValidationError
switch rule.Protocol {
case TCPProtocol:
validationError = rule.validatePorts()
if rule.IcmpInfo != nil {
validationError = validationError.Append(ErrInvalidField{"icmp_info"})
}
case UDPProtocol:
validationError = rule.validatePorts()
if rule.IcmpInfo != nil {
validationError = validationError.Append(ErrInvalidField{"icmp_info"})
}
if rule.Log == true {
validationError = validationError.Append(ErrInvalidField{"log"})
}
case ICMPProtocol:
if rule.PortRange != nil {
validationError = validationError.Append(ErrInvalidField{"port_range"})
}
if rule.Ports != nil {
validationError = validationError.Append(ErrInvalidField{"ports"})
}
if rule.IcmpInfo == nil {
validationError = validationError.Append(ErrInvalidField{"icmp_info"})
}
if rule.Log == true {
validationError = validationError.Append(ErrInvalidField{"log"})
}
case AllProtocol:
if rule.PortRange != nil {
validationError = validationError.Append(ErrInvalidField{"port_range"})
}
if rule.Ports != nil {
validationError = validationError.Append(ErrInvalidField{"ports"})
}
if rule.IcmpInfo != nil {
validationError = validationError.Append(ErrInvalidField{"icmp_info"})
}
default:
validationError = validationError.Append(ErrInvalidField{"protocol"})
}
if err := rule.validateDestinations(); err != nil {
validationError = validationError.Append(ErrInvalidField{"destinations [ " + err.Error() + " ]"})
}
if !validationError.Empty() {
return validationError
}
return nil
}
func (rule SecurityGroupRule) validatePorts() ValidationError {
var validationError ValidationError
if rule.PortRange == nil && rule.Ports == nil {
return validationError.Append(errors.New("Missing required field: ports or port_range"))
}
if rule.PortRange != nil && rule.Ports != nil {
return validationError.Append(errors.New("Invalid: ports and port_range provided"))
}
if rule.PortRange != nil {
if rule.PortRange.Start < 1 {
validationError = validationError.Append(ErrInvalidField{"port_range"})
}
if rule.PortRange.End < 1 {
validationError = validationError.Append(ErrInvalidField{"port_range"})
}
if rule.PortRange.Start > rule.PortRange.End {
validationError = validationError.Append(ErrInvalidField{"port_range"})
}
}
if rule.Ports != nil {
if len(rule.Ports) == 0 {
validationError = validationError.Append(ErrInvalidField{"ports"})
}
for _, p := range rule.Ports {
if p < 1 {
validationError = validationError.Append(ErrInvalidField{"ports"})
}
}
}
return validationError
}
func (rule SecurityGroupRule) validateDestinations() error {
if len(rule.Destinations) == 0 {
return errors.New("Must have at least 1 destination")
}
var validationError ValidationError
for _, d := range rule.Destinations {
n := strings.IndexAny(d, "-/")
if n == -1 {
if net.ParseIP(d) == nil {
validationError = validationError.Append(errInvalidIP)
continue
}
} else if d[n] == '/' {
_, _, err := net.ParseCIDR(d)
if err != nil {
validationError = validationError.Append(err)
continue
}
} else {
firstIP := net.ParseIP(d[:n])
secondIP := net.ParseIP(d[n+1:])
if firstIP == nil || secondIP == nil {
validationError = validationError.Append(errInvalidIP)
continue
}
for i, b := range firstIP {
if b < secondIP[i] {
break
}
if b == secondIP[i] {
continue
}
validationError = validationError.Append(errInvalidIP)
continue
}
}
}
if !validationError.Empty() {
return validationError
}
return nil
}