Questions_Answers.md

@@ -1,55 +0,0 @@
-## Level 1 Questions
-1.   How would you prove the code is correct?
-	
-   	To prove the code is correct I suppose I could set up a test environment
-		where I could account for all connections and run tests like
-		ssh connections, dhclient or dig (dns) connections, nmap port
-		scans, and then ensure the connections I expect from the tests
-		appear in the program's output.
-   
-2.   How would you make this solution better?
-	
-   	I'd improve the solution by making the functions more focused on
-		specific tasks, improving how I present the interface of each
-		function to each other to more specifically eliminate type
-		or value errors. I'd also allot more time to complete the task
-		since I wasn't able to find enough before the deadline.
-3.   Is it possible for this program to miss a connection?
-	
-   	Yes, if the connection is brief enough so as not to last more than 10
-		seconds and thereby be missed by the most recent read of the
-		/proc/net/tcp file
-4.   If you weren't following these requirements, how would you solve the problem of logging every new connection?
-	
-   	I would likely find a solution that leverages inotify to detect any change to the file and then read it,
-		rather than polling it every 10 seconds.
-
-## Level 2 Questions
-1.   Why did you choose 'x' to write the build automation?
-	
-	I would simply choose bash, as it's what I'm most familiar with and it
-		can reliably use the go build tools as well as invoke testing
-		systems like kvm/qemu, docker/podman and the like.
-2.  Is there anything else you would test if you had more time?
-	
-  	If I had more time I'd spend it fleshing out my testing as outlined above
-		and doing a more thorough job of structuring my data in the way
-		that I've modeled it in my head - the choice of go definitely
-		consigned me to reading more than writing with the little time
-		I had. Should have gone with bash I think.
-3.  What is the most important tool, script, or technique you have for solving
-  	problems in production? Explain why this tool/script/technique is the most important.
-
-  	
-## Level 3 Questions
-
-1.  If you had to deploy this program to hundreds of servers, what would be your
-  	preferred method and why?
-
-	I would use ansible and use git to clone, build, and install the script.
-		This method is my preferred one because it's simple to
-		troubleshoot in the event that I run into issues and 
-		ansible doesn't require a central orchestrator node. It's
-		also the Infrastructure-as-code tool I'm most familiar with.
-2.  What is the hardest technical problem or outage you've had to solve in your
-  	career? Explain what made it so difficult?

README

@@ -1,24 +0,0 @@
-# teleport_devops_challenge
-
-WARNING: This program is in an incomplete state and does not build successfully.
-	The latest commit that builds successfully can be found here: 
-	https://git.libre.audio/seasharp/teleport_devops_challenge/commit/93fd6f916bc5a6b7504c5475f7cbcebabaae5277
-	
-
-## Dependencies
-
- - golang 'encoding' package
-
-## Building
-
-Ensure your $GOPATH is set correctly and run:
-
-1. Execute `go build main.go` in repository root
-2. Execute `go install teleport_devops_challenge`
-
-## Executing
-
-Ensure GOPATH/bin (GOPATH = `go env GOPATH`) has been added to your shell $PATH
-	or execute the following:
-
- `PATH=/home/$(whoami)/go/bin:$PATH teleport_devops_challenge`

main.go

@@ -1,9 +1,5 @@
 package main
-
 import (
-"reflect"
-//"./timer"
-"time"
 "fmt"
 "strings"
 "regexp"
@@ -12,10 +8,7 @@ import (
 )
 
 
-var tcp_data string = read_tcp_file("/proc/net/tcp")
-
 func main() {
-	var loops int	= 0
 	// How to split on space-delimited fields, then colon-delimited fields?
 	// How to turn this byte into a string?
 
@@ -23,28 +16,7 @@ func main() {
 	// and then converted byte by byte (2 char at a time)
 	//fmt.Println(convert_address(reverse_string(reverse_bytes("0100007F"))))
 
-	for _ = range time.Tick(10 * time.Second) {
+	tcp_rows(read_tcp_file("/proc/net/tcp"))
-		fmt.Println("Waiting 10 seconds...")
-		for num, row := range get_tcp_rows(tcp_data) {
-			row_type	:= reflect.TypeOf(row)
-			fmt.Println(num, " ", row_type)
-		}
-	// if loops modulo 6 (1min) then
-	// 	for address in address_list do
-	//		if (grep address address_list | wc -l >=3) then
-	//			This is a port scan!
-	//		fi
-	//	done
-	// elseif (wc -l old_tcp_file < wc -l tcp_file) then
-	//	for i in (wc -l tcp_file - wc -l old_tcp_flle) do
-	//		print New Connection! reverse_strng(reverse_bytes(tcp_file[i])) // This oversimplifies row value selection for the sake
-	//										// of pseudocode
-	//	done
-	// else
-	//	"No new connections. Waiting another 10 seconds..."
-	// fi
-		loops++
-	}
 }
 
 func check(e error) {
@@ -53,21 +25,17 @@ func check(e error) {
     }
 }
 
-// Aiming for an array of [string]string maps
+func tcp_rows(connections_file string) {
-// Am I looking for a map[string]interface here?
+	regexpression	:= regexp.MustCompile(`[^a-zA-Z0-9:\r\n\t\v]+`)
-func get_tcp_rows(connections_file string) []string {
+	tcp_lines	:= strings.Split(connections_file, "\n")
-	tcp_lines		:= strings.Split(connections_file, "\n")
-	regexpression		:= regexp.MustCompile(`[\r\n\t\f\v]+`)
-	tcp_columns		:= regexpression.Split(tcp_lines[0], -1)
-	var tcp_values map[string]string
 
-	for i, line	:= range tcp_lines[1:] {
+	for _, line	:= range tcp_lines {
-		trim_line			:= strings.TrimSpace(line)
+		trim_line	:= strings.TrimSpace(line)
-		values				:= regexpression.Split(trim_line, -1)
+		values		:= regexpression.ReplaceAllString(trim_line, ",")
-		column				:= tcp_columns[i]
+// Debug
-		tcp_values[column]		= values
+//		fmt.Println("New Line ==========")
+		fmt.Println(values)
 	}
-	return tcp_values
 }
 
 // Take a string, create a rune slice, and use a loop to reverse it character-wise.

timer/timer.go

@@ -1,35 +0,0 @@
-package timer
-
-import (
-"fmt"
-"time"
-//"reflect"
-)
-
-func New(duration_int int, unit string) *time.Timer {
-
-	start		:= time.NewTimer(0)
-	duration	:= time.Duration(duration_int)
-//	fmt.Println(reflect.TypeOf(duration))
-//	timer_10s	:= time.NewTimer(10 * time.Second)
-//	timer_1m	:= time.NewTimer(1 * time.Minute)
-	fmt.Println("Duration: ", duration_int, "Unit: ", unit, ".")
-	if unit == "Second" {
-		start	= time.NewTimer(duration * time.Second)
-	} else if unit == "Minute" {
-		start	= time.NewTimer(duration * time.Minute)
-	} else {
-		fmt.Println("Unit not recognized.")
-	}
-	fmt.Println("Waiting ", duration_int, " ", unit, ".")
-	if start.Stop() {
-	<-start.C
-	fmt.Println("Done waiting ", duration_int, " ", unit, "!")
-	}
-	return start
-//	for elapsed < ten_seconds {
-//}
-//	for 
-}
-
-func Reset