From 1191d1548470a7ed1049f1d78de6f17b77e0d36d Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Sat, 6 Jan 2024 17:51:41 -0600
Subject: purge years of old test code

Signed-off-by: Jeff Carr <jcarr@wit.com>
---
 linuxstatus/proc.go | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 linuxstatus/proc.go

(limited to 'linuxstatus/proc.go')

diff --git a/linuxstatus/proc.go b/linuxstatus/proc.go
new file mode 100644
index 0000000..b7720e0
--- /dev/null
+++ b/linuxstatus/proc.go
@@ -0,0 +1,101 @@
+package linuxstatus
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"go.wit.com/log"
+)
+
+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 ""
+		}
+		// log.Log(PROC, "searchProcNet() data:", string(data))
+
+		lines := strings.Split(string(data), "\n")
+		for _, line := range lines {
+			fields := strings.Fields(line)
+			log.Log(PROC, "searchProcNet() portHex:", portHex)
+			if (len(fields) > 9) {
+				log.Log(PROC, "searchProcNet() fields[9]", fields[9])
+			}
+			log.Log(PROC, "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)
+					log.Log(PROC, "searchProcNet() value, port =", value, port, "parts[1] =", parts[1])
+					if (port == int(value)) {
+						log.Log(PROC, "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")
+	}
+	log.Log(PROC, "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:[") {
+				log.Log(PROC, "searchProcNet() fdLink has socket:", fdLink)
+				log.Log(PROC, "searchProcNet() proc.Name() =", proc.Name(), "s =", s)
+			}
+			if strings.Contains(fdLink, "socket:[35452]") {
+				log.Log(PROC, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[35450]") {
+				log.Log(PROC, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[35440]") {
+				log.Log(PROC, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:[21303]") {
+				log.Log(PROC, "searchProcNet() found proc.Name() =", proc.Name(), fdLink)
+				// return proc.Name()
+			}
+			if strings.Contains(fdLink, "socket:["+inode+"]") {
+				return proc.Name()
+			}
+		}
+	}
+
+	return ""
+}
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