From c84b9a0c7ca77a44d0d296ceb3bd25f2dc7a8417 Mon Sep 17 00:00:00 2001
From: Christoph Hartmann <chris@lollyrock.com>
Date: Sat, 24 Feb 2024 10:15:20 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20handle=20case=20where=20ipv4=20o?=
 =?UTF-8?q?r=20ipv6=20is=20disabled?=
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---
 providers/os/resources/port.go | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/providers/os/resources/port.go b/providers/os/resources/port.go
index ad8c486e01..e92ffad07e 100644
--- a/providers/os/resources/port.go
+++ b/providers/os/resources/port.go
@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"io"
 	"net/netip"
+	"os"
 	"regexp"
 	"strconv"
 	"strings"
@@ -242,13 +243,16 @@ func (p *mqlPorts) processesBySocket() (map[int64]*mqlProcess, error) {
 	return processes.BySocketID, err
 }
 
-// See:
-// - socket/address parsing: https://wiki.christophchamp.com/index.php?title=Unix_sockets
+// parseProcNet parses the proc filesystem
+// See socket/address parsing: https://wiki.christophchamp.com/index.php?title=Unix_sockets
 func (p *mqlPorts) parseProcNet(path string, protocol string, users map[int64]*mqlUser) ([]interface{}, error) {
 	conn := p.MqlRuntime.Connection.(shared.Connection)
 	fs := conn.FileSystem()
 	stat, err := fs.Stat(path)
-	if err != nil {
+	// if the file does not exist, we just return nil since no ports are open then
+	if errors.Is(err, os.ErrNotExist) {
+		return nil, nil
+	} else if err != nil {
 		return nil, errors.New("cannot access stat for " + path)
 	}
 	if stat.IsDir() {
@@ -379,6 +383,8 @@ func (p *mqlPorts) listLinux() ([]interface{}, error) {
 		return nil, err
 	}
 
+	// check if kernel supports /proc/net/tcp4
+
 	var ports []interface{}
 	tcpPorts, err := p.parseProcNet("/proc/net/tcp", "tcp4", users)
 	if err != nil {
@@ -392,6 +398,8 @@ func (p *mqlPorts) listLinux() ([]interface{}, error) {
 	}
 	ports = append(ports, udpPorts...)
 
+	// check if kernel supports /proc/net/tcp6
+
 	tcpPortsV6, err := p.parseProcNet("/proc/net/tcp6", "tcp6", users)
 	if err != nil {
 		return nil, err