From 4c3be58461858c511a25da62e63e29c9b90a63a6 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Wed, 20 Dec 2023 03:13:43 -0600
Subject: make a cloudflare package

    move cloudflare stuff to a package
    display cloudflare API values
    dns protobuf example
    sort output, but gocli formatting is bad
    cloudflare window can be closed
    first time success pushing AAAA records for my box
    enable a cloudflare button
    RFC 8482. DNS servers we use should respond to ANY
    	We should support ANY requests via DNS
    	as long as we enforce TCP over UDP
    populate the API provider
    domain NS record changes are tracked
    check hostname OS configuration
    detect domain name changes
    lookup of NS records for my domain name
    button to investigate port 53 daemon
    start dns resolver detection and debugging
    measure dns resolution speed
    sort todo items

Signed-off-by: Jeff Carr <jcarr@wit.com>
---
 proc.go | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 proc.go

(limited to 'proc.go')

diff --git a/proc.go b/proc.go
new file mode 100644
index 0000000..bf78c16
--- /dev/null
+++ b/proc.go
@@ -0,0 +1,99 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+func getProcessNameByPort(port int) string {
+	// Convert port to hex string
+	portHex := strconv.FormatInt(int64(port), 16)
+
+	// Function to search /proc/net/tcp or /proc/net/udp
+	searchProcNet := func(file string) string {
+		data, err := ioutil.ReadFile(file)
+		if err != nil {
+			return ""
+		}
+		// debug(LogProc, "searchProcNet() data:", string(data))
+
+		lines := strings.Split(string(data), "\n")
+		for _, line := range lines {
+			fields := strings.Fields(line)
+			debug(LogProc, "searchProcNet() portHex:", portHex)
+			if (len(fields) > 9) {
+				debug(LogProc, "searchProcNet() fields[9]", fields[9])
+			}
+			debug(LogProc, "searchProcNet() lines:", line)
+			if len(fields) > 1 {
+				parts := strings.Split(fields[1], ":")
+				if len(parts) > 1 {
+					// Convert the hexadecimal string to an integer
+					value, _ := strconv.ParseInt(parts[1], 16, 64)
+					debug(LogProc, "searchProcNet() value, port =", value, port, "parts[1] =", parts[1])
+					if (port == int(value)) {
+						debug(LogProc, "searchProcNet() THIS IS THE LINE:", fields)
+						return fields[9]
+					}
+				}
+			}
+		}
+
+		return ""
+	}
+
+	// Search TCP and then UDP
+	inode := searchProcNet("/proc/net/tcp")
+	if inode == "" {
+		inode = searchProcNet("/proc/net/udp")
+	}
+	debug(LogProc, "searchProcNet() inode =", inode)
+
+	// Search for process with the inode
+	procs, _ := ioutil.ReadDir("/proc")
+	for _, proc := range procs {
+		if !proc.IsDir() {
+			continue
+		}
+
+		fdPath := filepath.Join("/proc", proc.Name(), "fd")
+		fds, err := ioutil.ReadDir(fdPath)
+		if err != nil {
+			continue // Process might have exited; skip it
+		}
+
+		for _, fd := range fds {
+			fdLink, _ := os.Readlink(filepath.Join(fdPath, fd.Name()))
+			var s string
+			s = "socket:["+inode+"]"
+			if strings.Contains(fdLink, "socket:[") {
+				debug(LogProc, "searchProcNet() fdLink has socket:", fdLink)
+				debug(LogProc, "searchProcNet() proc.Name() =", proc.Name(), "s =", s)
+			}
+			if strings.Contains(fdLink, "socket:[35452]") {
+				debug(LogProc, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[35450]") {
+				debug(LogProc, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[35440]") {
+				debug(LogProc, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[21303]") {
+				debug(LogProc, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				// return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:["+inode+"]") {
+				return proc.Name()
+			}
+		}
+	}
+
+	return ""
+}
-- 
cgit v1.2.3