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utils.go
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/
utils.go
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// Copyright 2016-2017 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"bufio"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
)
// goArray2C transforms a byte slice into its hexadecimal string representation.
// Example:
// array := []byte{0x12, 0xFF, 0x0, 0x01}
// fmt.Print(GoArray2C(array)) // "{ 0x12, 0xff, 0x0, 0x1 }"
func goArray2C(array []byte) string {
ret := ""
for i, e := range array {
if i == 0 {
ret = ret + fmt.Sprintf("%#x", e)
} else {
ret = ret + fmt.Sprintf(", %#x", e)
}
}
return ret
}
func FmtDefineComma(name string, addr []byte) string {
return fmt.Sprintf("#define %s %s\n", name, goArray2C(addr))
}
// FmtDefineAddress returns the a define string from the given name and addr.
// Example:
// fmt.Print(FmtDefineAddress("foo", []byte{1, 2, 3})) // "#define foo { .addr = { 0x1, 0x2, 0x3 } }\n"
func FmtDefineAddress(name string, addr []byte) string {
return fmt.Sprintf("#define %s { .addr = { %s } }\n", name, goArray2C(addr))
}
// FmtDefineArray returns the a define string from the given name and array.
// Example:
// fmt.Print(FmtDefineArray("foo", []byte{1, 2, 3})) // "#define foo { 0x1, 0x2, 0x3 }\n"
func FmtDefineArray(name string, array []byte) string {
return fmt.Sprintf("#define %s { %s }\n", name, goArray2C(array))
}
// GetGroupIDByName returns the group ID for the given grpName.
func GetGroupIDByName(grpName string) (int, error) {
f, err := os.Open(GroupFilePath)
if err != nil {
return -1, err
}
defer f.Close()
br := bufio.NewReader(f)
for {
s, err := br.ReadString('\n')
if err == io.EOF {
break
}
if err != nil {
return -1, err
}
p := strings.Split(s, ":")
if len(p) >= 3 && p[0] == grpName {
return strconv.Atoi(p[2])
}
}
return -1, fmt.Errorf("group %q not found", grpName)
}
// FindEPConfigCHeader returns the full path of the file that is the CHeaderFileName from
// the slice of files
func FindEPConfigCHeader(basePath string, epFiles []os.FileInfo) string {
for _, epFile := range epFiles {
if epFile.Name() == CHeaderFileName {
return filepath.Join(basePath, epFile.Name())
}
}
return ""
}
// GetCiliumVersionString returns the first line containing CiliumCHeaderPrefix.
func GetCiliumVersionString(epCHeaderFilePath string) (string, error) {
f, err := os.Open(epCHeaderFilePath)
if err != nil {
return "", err
}
br := bufio.NewReader(f)
defer f.Close()
for {
s, err := br.ReadString('\n')
if err == io.EOF {
return "", nil
}
if err != nil {
return "", err
}
if strings.Contains(s, CiliumCHeaderPrefix) {
return s, nil
}
}
}
// RequireRootPrivilege checks if the user running cmd is root. If not, it exits the program
func RequireRootPrivilege(cmd string) {
if os.Getuid() != 0 {
fmt.Fprintf(os.Stderr, "Please run %q command(s) with root privileges.\n", cmd)
os.Exit(1)
}
}