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moby--moby/nat/nat.go
Srini Brahmaroutu fd774a818c adding support for port ranges on --expose
Closes #1834

Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>
2014-10-31 23:06:30 +00:00

152 lines
3.4 KiB
Go

package nat
// nat is a convenience package for docker's manipulation of strings describing
// network ports.
import (
"fmt"
"net"
"strconv"
"strings"
"github.com/docker/docker/pkg/parsers"
)
const (
PortSpecTemplate = "ip:hostPort:containerPort"
PortSpecTemplateFormat = "ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort | containerPort"
)
type PortBinding struct {
HostIp string
HostPort string
}
type PortMap map[Port][]PortBinding
type PortSet map[Port]struct{}
// 80/tcp
type Port string
func NewPort(proto, port string) Port {
return Port(fmt.Sprintf("%s/%s", port, proto))
}
func ParsePort(rawPort string) (int, error) {
port, err := strconv.ParseUint(rawPort, 10, 16)
if err != nil {
return 0, err
}
return int(port), nil
}
func (p Port) Proto() string {
proto, _ := SplitProtoPort(string(p))
return proto
}
func (p Port) Port() string {
_, port := SplitProtoPort(string(p))
return port
}
func (p Port) Int() int {
port, err := ParsePort(p.Port())
if err != nil {
panic(err)
}
return port
}
// Splits a port in the format of proto/port
func SplitProtoPort(rawPort string) (string, string) {
parts := strings.Split(rawPort, "/")
l := len(parts)
if len(rawPort) == 0 || l == 0 || len(parts[0]) == 0 {
return "", ""
}
if l == 1 {
return "tcp", rawPort
}
if len(parts[1]) == 0 {
return "tcp", parts[0]
}
return parts[1], parts[0]
}
func validateProto(proto string) bool {
for _, availableProto := range []string{"tcp", "udp"} {
if availableProto == proto {
return true
}
}
return false
}
// We will receive port specs in the format of ip:public:private/proto and these need to be
// parsed in the internal types
func ParsePortSpecs(ports []string) (map[Port]struct{}, map[Port][]PortBinding, error) {
var (
exposedPorts = make(map[Port]struct{}, len(ports))
bindings = make(map[Port][]PortBinding)
)
for _, rawPort := range ports {
proto := "tcp"
if i := strings.LastIndex(rawPort, "/"); i != -1 {
proto = rawPort[i+1:]
rawPort = rawPort[:i]
}
if !strings.Contains(rawPort, ":") {
rawPort = fmt.Sprintf("::%s", rawPort)
} else if len(strings.Split(rawPort, ":")) == 2 {
rawPort = fmt.Sprintf(":%s", rawPort)
}
parts, err := parsers.PartParser(PortSpecTemplate, rawPort)
if err != nil {
return nil, nil, err
}
var (
containerPort = parts["containerPort"]
rawIp = parts["ip"]
hostPort = parts["hostPort"]
)
if rawIp != "" && net.ParseIP(rawIp) == nil {
return nil, nil, fmt.Errorf("Invalid ip address: %s", rawIp)
}
if containerPort == "" {
return nil, nil, fmt.Errorf("No port specified: %s<empty>", rawPort)
}
if _, err := strconv.ParseUint(containerPort, 10, 16); err != nil {
return nil, nil, fmt.Errorf("Invalid containerPort: %s", containerPort)
}
if _, err := strconv.ParseUint(hostPort, 10, 16); hostPort != "" && err != nil {
return nil, nil, fmt.Errorf("Invalid hostPort: %s", hostPort)
}
if !validateProto(proto) {
return nil, nil, fmt.Errorf("Invalid proto: %s", proto)
}
port := NewPort(proto, containerPort)
if _, exists := exposedPorts[port]; !exists {
exposedPorts[port] = struct{}{}
}
binding := PortBinding{
HostIp: rawIp,
HostPort: hostPort,
}
bslice, exists := bindings[port]
if !exists {
bslice = []PortBinding{}
}
bindings[port] = append(bslice, binding)
}
return exposedPorts, bindings, nil
}