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package common
import (
"net"
"strconv"
"strings"
"github.com/containers/libpod/pkg/specgen"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// createExpose parses user-provided exposed port definitions and converts them
// into SpecGen format.
// TODO: The SpecGen format should really handle ranges more sanely - we could
// be massively inflating what is sent over the wire with a large range.
func createExpose(expose []string) (map[uint16]string, error) {
toReturn := make(map[uint16]string)
for _, e := range expose {
// Check for protocol
proto := "tcp"
splitProto := strings.Split(e, "/")
if len(splitProto) > 2 {
return nil, errors.Errorf("invalid expose format - protocol can only be specified once")
} else if len(splitProto) == 2 {
proto = splitProto[1]
}
// Check for a range
start, len, err := parseAndValidateRange(splitProto[0])
if err != nil {
return nil, err
}
var index uint16
for index = 0; index < len; index++ {
portNum := start + index
protocols, ok := toReturn[portNum]
if !ok {
toReturn[portNum] = proto
} else {
newProto := strings.Join(append(strings.Split(protocols, ","), strings.Split(proto, ",")...), ",")
toReturn[portNum] = newProto
}
}
}
return toReturn, nil
}
// createPortBindings iterates ports mappings into SpecGen format.
func createPortBindings(ports []string) ([]specgen.PortMapping, error) {
// --publish is formatted as follows:
// [[hostip:]hostport[-endPort]:]containerport[-endPort][/protocol]
toReturn := make([]specgen.PortMapping, 0, len(ports))
for _, p := range ports {
var (
ctrPort string
proto, hostIP, hostPort *string
)
splitProto := strings.Split(p, "/")
switch len(splitProto) {
case 1:
// No protocol was provided
case 2:
proto = &(splitProto[1])
default:
return nil, errors.Errorf("invalid port format - protocol can only be specified once")
}
splitPort := strings.Split(splitProto[0], ":")
switch len(splitPort) {
case 1:
ctrPort = splitPort[0]
case 2:
hostPort = &(splitPort[0])
ctrPort = splitPort[1]
case 3:
hostIP = &(splitPort[0])
hostPort = &(splitPort[1])
ctrPort = splitPort[2]
default:
return nil, errors.Errorf("invalid port format - format is [[hostIP:]hostPort:]containerPort")
}
newPort, err := parseSplitPort(hostIP, hostPort, ctrPort, proto)
if err != nil {
return nil, err
}
toReturn = append(toReturn, newPort)
}
return toReturn, nil
}
// parseSplitPort parses individual components of the --publish flag to produce
// a single port mapping in SpecGen format.
func parseSplitPort(hostIP, hostPort *string, ctrPort string, protocol *string) (specgen.PortMapping, error) {
newPort := specgen.PortMapping{}
if ctrPort == "" {
return newPort, errors.Errorf("must provide a non-empty container port to publish")
}
ctrStart, ctrLen, err := parseAndValidateRange(ctrPort)
if err != nil {
return newPort, errors.Wrapf(err, "error parsing container port")
}
newPort.ContainerPort = ctrStart
newPort.Range = ctrLen
if protocol != nil {
if *protocol == "" {
return newPort, errors.Errorf("must provide a non-empty protocol to publish")
}
newPort.Protocol = *protocol
}
if hostIP != nil {
if *hostIP == "" {
return newPort, errors.Errorf("must provide a non-empty container host IP to publish")
}
testIP := net.ParseIP(*hostIP)
if testIP == nil {
return newPort, errors.Errorf("cannot parse %q as an IP address", *hostIP)
}
newPort.HostIP = testIP.String()
}
if hostPort != nil {
if *hostPort == "" {
return newPort, errors.Errorf("must provide a non-empty container host port to publish")
}
hostStart, hostLen, err := parseAndValidateRange(*hostPort)
if err != nil {
return newPort, errors.Wrapf(err, "error parsing host port")
}
if hostLen != ctrLen {
return newPort, errors.Errorf("host and container port ranges have different lengths: %d vs %d", hostLen, ctrLen)
}
newPort.HostPort = hostStart
}
hport := newPort.HostPort
if hport == 0 {
hport = newPort.ContainerPort
}
logrus.Debugf("Adding port mapping from %d to %d length %d protocol %q", hport, newPort.ContainerPort, newPort.Range, newPort.Protocol)
return newPort, nil
}
// Parse and validate a port range.
// Returns start port, length of range, error.
func parseAndValidateRange(portRange string) (uint16, uint16, error) {
splitRange := strings.Split(portRange, "-")
if len(splitRange) > 2 {
return 0, 0, errors.Errorf("invalid port format - port ranges are formatted as startPort-stopPort")
}
if splitRange[0] == "" {
return 0, 0, errors.Errorf("port numbers cannot be negative")
}
startPort, err := parseAndValidatePort(splitRange[0])
if err != nil {
return 0, 0, err
}
var rangeLen uint16 = 1
if len(splitRange) == 2 {
if splitRange[1] == "" {
return 0, 0, errors.Errorf("must provide ending number for port range")
}
endPort, err := parseAndValidatePort(splitRange[1])
if err != nil {
return 0, 0, err
}
if endPort <= startPort {
return 0, 0, errors.Errorf("the end port of a range must be higher than the start port - %d is not higher than %d", endPort, startPort)
}
// Our range is the total number of ports
// involved, so we need to add 1 (8080:8081 is
// 2 ports, for example, not 1)
rangeLen = endPort - startPort + 1
}
return startPort, rangeLen, nil
}
// Turn a single string into a valid U16 port.
func parseAndValidatePort(port string) (uint16, error) {
num, err := strconv.Atoi(port)
if err != nil {
return 0, errors.Wrapf(err, "cannot parse %q as a port number", port)
}
if num < 1 || num > 65535 {
return 0, errors.Errorf("port numbers must be between 1 and 65535 (inclusive), got %d", num)
}
return uint16(num), nil
}
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