fix: guard string splits against nil (#238)

Signed-off-by: Chris Gianelloni <wolf31o2@blinklabs.io>

main.go

@@ -1043,6 +1043,9 @@ func getPeerText(ctx context.Context) string {
 		if strings.Contains(peer.IP, ":") {
 			if len(strings.Split(peer.IP, ":")) > 3 {
 				splitIP := strings.Split(peer.IP, ":")
+				if splitIP == nil {
+					continue
+				}
 				peerIP = fmt.Sprintf("%s...%s:%s",
 					splitIP[0],
 					splitIP[:len(splitIP)-2],
@@ -1223,7 +1226,7 @@ func tcpinfoRtt(address string) int {
 	if err != nil {
 		return result
 	}
-	var q *tcpinfo.Info
+	q := &tcpinfo.Info{}
 	if err := json.Unmarshal(txt, &q); err != nil {
 		result = int(q.RTT.Seconds() * 1000)
 	}

peers.go

@@ -87,6 +87,9 @@ func filterPeers(ctx context.Context) error {
 	// Process peersIn
 	for _, peer := range peersIn {
 		p := strings.Split(peer, ":")
+		if p == nil {
+			continue
+		}
 		peerIP := p[0]
 		peerPORT := p[1]
 		if strings.HasPrefix(peerIP, "[") { // IPv6
@@ -100,7 +103,11 @@ func filterPeers(ctx context.Context) error {
 		} else {
 			added := false
 			for i, toCheck := range peers {
-				checkIP := strings.Split(toCheck, ":")[0]
+				checkIPArr := strings.Split(toCheck, ":")
+				if checkIPArr == nil {
+					continue
+				}
+				checkIP := checkIPArr[0]
 				if checkIP == peerIP {
 					if p[2] != "i" {
 						// Remove and re-add as duplex (i+o)
@@ -120,6 +127,9 @@ func filterPeers(ctx context.Context) error {
 	// Process peersOut
 	for _, peer := range peersOut {
 		p := strings.Split(peer, ":")
+		if p == nil {
+			continue
+		}
 		peerIP := p[0]
 		peerPORT := p[1]
 		if strings.HasPrefix(peerIP, "[") { // IPv6
@@ -133,7 +143,11 @@ func filterPeers(ctx context.Context) error {
 		} else {
 			added := false
 			for i, toCheck := range peers {
-				checkIP := strings.Split(toCheck, ":")[0]
+				checkIPArr := strings.Split(toCheck, ":")
+				if checkIPArr == nil {
+					continue
+				}
+				checkIP := checkIPArr[0]
 				if checkIP == peerIP {
 					if p[2] != "o" {
 						// Remove and re-add as duplex (i+o)
@@ -175,6 +189,9 @@ func pingPeers(ctx context.Context) error {
 			go func() {
 				defer wg.Done()
 				peerArr := strings.Split(v, ";")
+				if peerArr == nil {
+					return
+				}
 				peerIP := peerArr[0]
 				peerPORT := peerArr[1]
 				peerDIR := peerArr[2]

utils.go

@@ -1,4 +1,4 @@
-// Copyright 2023 Blink Labs Software
+// Copyright 2024 Blink Labs Software
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -36,6 +36,9 @@ func getNodeVersion() (version string, revision string, err error) {
 		return "N/A", "N/A", err
 	}
 	strArray := strings.Split(string(stdout), string(' '))
+	if strArray == nil {
+		return "N/A", "N/A", fmt.Errorf("error")
+	}
 	version = strArray[1]
 	revision = strArray[7]
 	if len(revision) > 8 {