github.com/fafucoder/cilium@v1.6.11/pkg/modules/modules_linux.go (about)

     1  // Copyright 2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package modules
    16  
    17  import (
    18  	"bufio"
    19  	"fmt"
    20  	"io"
    21  	"os"
    22  	"strings"
    23  )
    24  
    25  const (
    26  	modulesFilepath = "/proc/modules"
    27  )
    28  
    29  func moduleLoader() string {
    30  	return "modprobe"
    31  }
    32  
    33  // parseModulesFile returns the list of loaded kernel modules names.
    34  func parseModulesFile(r io.Reader) ([]string, error) {
    35  	var result []string
    36  
    37  	scanner := bufio.NewScanner(r)
    38  	scanner.Split(bufio.ScanLines)
    39  
    40  	for scanner.Scan() {
    41  		moduleInfoRaw := scanner.Text()
    42  		moduleInfoSeparated := strings.Split(moduleInfoRaw, " ")
    43  		if len(moduleInfoSeparated) < 6 {
    44  			return nil, fmt.Errorf(
    45  				"invalid module info - it has %d fields (less than 6): %s",
    46  				len(moduleInfoSeparated), moduleInfoRaw)
    47  		}
    48  
    49  		result = append(result, moduleInfoSeparated[0])
    50  	}
    51  
    52  	return result, nil
    53  }
    54  
    55  // listModules returns the list of loaded kernel modules names parsed from
    56  // /proc/modules.
    57  func listModules() ([]string, error) {
    58  	fModules, err := os.Open(modulesFilepath)
    59  	if err != nil {
    60  		return nil, fmt.Errorf(
    61  			"failed to open modules information at %s: %s",
    62  			modulesFilepath, err)
    63  	}
    64  	defer fModules.Close()
    65  	return parseModulesFile(fModules)
    66  }