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105 lines
3.3 KiB
105 lines
3.3 KiB
/*
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Copyright © 2020 The k3d Author(s)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package util
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import (
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"fmt"
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"net"
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"strconv"
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"strings"
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k3d "github.com/rancher/k3d/v3/pkg/types"
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log "github.com/sirupsen/logrus"
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)
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// ParseAPIPort parses/validates a string to create an exposeAPI struct from it
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func ParseAPIPort(portString string) (k3d.ExposeAPI, error) {
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var exposeAPI k3d.ExposeAPI
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split := strings.Split(portString, ":")
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if len(split) > 2 {
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log.Errorln("Failed to parse API Port specification")
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return exposeAPI, fmt.Errorf("api-port format error")
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}
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if len(split) == 1 {
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exposeAPI = k3d.ExposeAPI{Port: split[0]}
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} else {
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// Make sure 'host' can be resolved to an IP address
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addrs, err := net.LookupHost(split[0])
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if err != nil {
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return exposeAPI, err
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}
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exposeAPI = k3d.ExposeAPI{Host: split[0], HostIP: addrs[0], Port: split[1]}
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}
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// Verify 'port' is an integer and within port ranges
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if exposeAPI.Port == "" || exposeAPI.Port == "random" {
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log.Debugf("API-Port Mapping didn't specify hostPort, choosing one randomly...")
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freePort, err := GetFreePort()
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if err != nil || freePort == 0 {
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log.Warnf("Failed to get random free port:\n%+v", err)
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log.Warnf("Falling back to default port %s (may be blocked though)...", k3d.DefaultAPIPort)
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exposeAPI.Port = k3d.DefaultAPIPort
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} else {
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exposeAPI.Port = strconv.Itoa(freePort)
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log.Debugf("Got free port for API: '%d'", freePort)
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}
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}
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p, err := strconv.Atoi(exposeAPI.Port)
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if err != nil {
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log.Errorln("Failed to parse port mapping")
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return exposeAPI, err
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}
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if p < 0 || p > 65535 {
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log.Errorln("Failed to parse API Port specification")
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return exposeAPI, fmt.Errorf("Port value '%d' out of range", p)
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}
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return exposeAPI, nil
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}
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// ValidatePortMap validates a port mapping
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func ValidatePortMap(portmap string) (string, error) {
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return portmap, nil // TODO: ValidatePortMap: add validation of port mapping
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}
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// GetFreePort tries to fetch an open port from the OS-Kernel
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func GetFreePort() (int, error) {
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tcpAddress, err := net.ResolveTCPAddr("tcp", "localhost:0")
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if err != nil {
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log.Errorln("Failed to resolve address")
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return 0, err
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}
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tcpListener, err := net.ListenTCP("tcp", tcpAddress)
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if err != nil {
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log.Errorln("Failed to create TCP Listener")
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return 0, err
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}
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defer tcpListener.Close()
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return tcpListener.Addr().(*net.TCPAddr).Port, nil
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}
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