Minimum needed to insert new client.

main.go

@@ -3,46 +3,50 @@ package main
 import (
 	"database/sql"
 	"fmt"
+	"io"
 	"log"
 	"net"
 	"os"
+	"os/exec"
+	"strconv"
+	"strings"
 	"time"
 
 	_ "github.com/mattn/go-sqlite3"
 )
 
 type WgEasyClient struct {
-	ID                  int      `json:"id"`
-	UserID              int      `json:"user_id"`
-	InterfaceID         string   `json:"interface_id"`
-	Name                string   `json:"name"`
-	IPv4Address         string   `json:"ipv4_address"`
-	IPv6Address         string   `json:"ipv6_address"`
-	PreUp               string   `json:"pre_up"`
-	PostUp              string   `json:"post_up"`
-	PreDown             string   `json:"pre_down"`
-	PostDown            string   `json:"post_down"`
-	PrivateKey          string   `json:"private_key"`
-	PublicKey           string   `json:"public_key"`
-	PreSharedKey        string   `json:"pre_shared_key"`
-	ExpiresAt           string   `json:"expires_at,omitempty"`
-	AllowedIps          []string `json:"allowed_ips,omitempty"`
-	ServerAllowedIps    []string `json:"server_allowed_ips"`
-	PersistentKeepalive int      `json:"persistent_keepalive"`
-	MTU                 int      `json:"mtu"`
-	JC                  int      `json:"j_c"`
-	JMin                int      `json:"j_min"`
-	JMax                int      `json:"j_max"`
-	I1                  string   `json:"i1,omitempty"`
-	I2                  string   `json:"i2,omitempty"`
-	I3                  string   `json:"i3,omitempty"`
-	I4                  string   `json:"i4,omitempty"`
-	I5                  string   `json:"i5,omitempty"`
-	DNS                 []string `json:"dns,omitempty"`
-	ServerEndpoint      string   `json:"server_endpoint"`
-	Enabled             bool     `json:"enabled"`
-	CreatedAt           string   `json:"created_at"`
-	UpdatedAt           string   `json:"updated_at"`
+	ID                  int    `json:"id"`
+	UserID              int    `json:"user_id"`
+	InterfaceID         string `json:"interface_id"`
+	Name                string `json:"name"`
+	IPv4Address         string `json:"ipv4_address"`
+	IPv6Address         string `json:"ipv6_address"`
+	PreUp               string `json:"pre_up"`
+	PostUp              string `json:"post_up"`
+	PreDown             string `json:"pre_down"`
+	PostDown            string `json:"post_down"`
+	PrivateKey          string `json:"private_key"`
+	PublicKey           string `json:"public_key"`
+	PreSharedKey        string `json:"pre_shared_key"`
+	ExpiresAt           string `json:"expires_at,omitempty"`
+	AllowedIps          string `json:"allowed_ips,omitempty"`
+	ServerAllowedIps    string `json:"server_allowed_ips"`
+	PersistentKeepalive int    `json:"persistent_keepalive"`
+	MTU                 int    `json:"mtu"`
+	JC                  int    `json:"j_c"`
+	JMin                int    `json:"j_min"`
+	JMax                int    `json:"j_max"`
+	I1                  string `json:"i1,omitempty"`
+	I2                  string `json:"i2,omitempty"`
+	I3                  string `json:"i3,omitempty"`
+	I4                  string `json:"i4,omitempty"`
+	I5                  string `json:"i5,omitempty"`
+	DNS                 string `json:"dns,omitempty"`
+	ServerEndpoint      string `json:"server_endpoint"`
+	Enabled             int    `json:"enabled"`
+	CreatedAt           string `json:"created_at"`
+	UpdatedAt           string `json:"updated_at"`
 }
 
 type WgEasyConfig struct {
@@ -57,7 +61,7 @@ type WgEasyConfig struct {
 	UpdatedAt         time.Time `json:"updated_at"`
 }
 
-type WgEasyInterfaceConfig struct {
+type WgEasyInterface struct {
 	Name       string    `json:"name"`
 	Device     string    `json:"device"`
 	Port       int       `json:"port"`
@@ -87,10 +91,12 @@ func insertNewUser(client WgEasyClient) {
 		return
 	}
 
-	insertStmt := `INSERT INTO clients_table (userId, interfaceId, name, ipv4Address, ipv6Address, preUp, postUp, preDown, postDown, privateKey, publicKey, preSharedKey, expiresAt, allowedIps, serverAllowedIps, persistentKeepalive, mtu, jC, jMin, jMax, i1, i2, i3, i4, i5, dns, serverEndpoint, enabled) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
+	insertStmt := "INSERT INTO clients_table (id, user_id, interface_id, name, ipv4_address, ipv6_address, pre_up, post_up, pre_down, post_down, private_key, public_key, pre_shared_key, allowed_ips, server_allowed_ips, persistent_keepalive, mtu, dns, server_endpoint, enabled, created_at, updated_at) VALUES (?, ?, ?, ?, ?, '::1', '', '', '', '', ?, ?, ?, ?, ?, ?, ?, ?, ?, 1, '" + strconv.FormatInt(time.Now().Unix(), 10) + "', '" + strconv.FormatInt(time.Now().Unix(), 10) + "')"
+	fmt.Println(insertStmt)
 
 	_, err = db.Exec(insertStmt,
 		// Replace these values with the actual data you want to insert
+		client.ID,
 		client.UserID,
 		client.InterfaceID,
 		client.Name,
@@ -103,24 +109,15 @@ func insertNewUser(client WgEasyClient) {
 		client.PrivateKey,
 		client.PublicKey,
 		client.PreSharedKey,
-		client.ExpiresAt,
 		client.AllowedIps,
 		client.ServerAllowedIps,
 		client.PersistentKeepalive,
 		client.MTU,
-		client.JC,
-		client.JMin,
-		client.JMax,
-		client.I1,
-		client.I2,
-		client.I3,
-		client.I4,
-		client.I5,
 		client.DNS,
 		client.ServerEndpoint,
-		client.Enabled,
-		client.CreatedAt,
-		client.UpdatedAt,
+		// client.Enabled,
+		// client.CreatedAt,
+		// client.UpdatedAt,
 	)
 
 	if err != nil {
@@ -130,7 +127,34 @@ func insertNewUser(client WgEasyClient) {
 	fmt.Println("Inserted new row successfully")
 }
 
-func getLatestClient(rowName string) WgEasyClient {
+func getNetwork() WgEasyInterface {
+	db_file := getEnv("DB_FILE", "wg-easy.db")
+	db, err := sql.Open("sqlite3", db_file)
+	if err != nil {
+		fmt.Println(err)
+	}
+	queryString := "SELECT ipv4_cidr, mtu FROM interfaces_table WHERE name = 'wg0'"
+
+	rows, err := db.Query(queryString)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
+	var network WgEasyInterface
+	for rows.Next() {
+		fmt.Println(rows)
+		err = rows.Scan(&network.IPv4CIDR, &network.MTU)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	return network
+
+}
+
+func getLatestClient() WgEasyClient {
 	var client WgEasyClient
 	db_file := getEnv("DB_FILE", "wg-easy.db")
 	db, err := sql.Open("sqlite3", db_file)
@@ -138,16 +162,16 @@ func getLatestClient(rowName string) WgEasyClient {
 		fmt.Println(err)
 	}
 
-	queryString := "SELECT MAX(id), ipv4_address FROM clients_table"
+	queryString := "SELECT MAX(id), user_id, interface_id, name, ipv4_address, persistent_keepalive FROM clients_table"
 
-	rows, err := db.Query(queryString, rowName, rowName)
+	rows, err := db.Query(queryString)
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer rows.Close()
 
 	for rows.Next() {
-		err = rows.Scan(&client.ID, &client.IPv4Address)
+		err = rows.Scan(&client.ID, &client.UserID, &client.InterfaceID, &client.Name, &client.IPv4Address, &client.PersistentKeepalive)
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -172,6 +196,109 @@ func getNextIp(ip net.IP) net.IP {
 	return net.IP(ip)
 }
 
+// Borrowed from here: https://github.com/icyflame/wireguard-configuration-generator/blob/81d955916a3f3e5a0bbab0a2c9ea328a46b29bc9/internal/keygen/keygen.go#L113
+func generatePrivateKey(location string) ([]byte, error) {
+	cmd := exec.Command("wg", "genkey")
+	privateKey, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("could not generate private key: %w", err)
+	}
+
+	err = os.WriteFile(location, privateKey, 0600)
+	if err != nil {
+		return nil, fmt.Errorf("could not write private key to file: %w", err)
+	}
+
+	return privateKey, nil
+}
+
+// Borrowed (minor changes) from just a few lines below the other func: https://github.com/icyflame/wireguard-configuration-generator/blob/81d955916a3f3e5a0bbab0a2c9ea328a46b29bc9/internal/keygen/keygen.go#L129
+func generatePublicKey(privateKey []byte, location string) ([]byte, error) {
+	cmd := exec.Command("wg", "pubkey")
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, fmt.Errorf("could not get stdin of pubkey command: %w", err)
+	}
+
+	go func() {
+		defer stdin.Close()
+		io.WriteString(stdin, string(privateKey))
+	}()
+
+	publicKey, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("could not generate public key: %w", err)
+	}
+
+	err = os.WriteFile(location, publicKey, 0600)
+	if err != nil {
+		return nil, fmt.Errorf("could not write private key to file: %w", err)
+	}
+
+	return publicKey, nil
+}
+
+func generatePreshareKey() ([]byte, error) {
+	cmd := exec.Command("wg", "genpsk")
+	presharedKey, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("could not generate preshared key: %w", err)
+	}
+
+	return presharedKey, nil
+}
+
+func getNextIPWithMask(ip net.IP, mask net.IPMask) net.IP {
+	// Ensure the IP is in 4-byte format
+	if len(ip) != net.IPv4len {
+		ip = ip.To4()
+	}
+
+	// Convert the IP and mask to a slice of bytes
+	ipBytes := ip.To4()
+	fmt.Printf("IP first byte: %d\n", ipBytes[0])
+	maskOnes, maskBits := mask.Size()
+	fmt.Printf("Mask Ones: %d\n", maskOnes)
+	fmt.Printf("Mask Bits: %d\n", maskBits)
+	// maskBytes := mask.To4()
+
+	// Determine the number of bits in the host part
+	// var hostBits int
+	// for i := 0; i < net.IPv4len; i++ {
+	// 	if maskBytes[i] == 0xFF {
+	// 		// If the byte is all 1s, it means we have 8 bits of host bits.
+	// 		hostBits += 8
+	// 	} else {
+	// 		// Otherwise, we need to count the trailing zeros.
+	// 		for j := 7; j >= 0; j-- {
+	// 			if (maskBytes[i] & (1 << j)) != 0 {
+	// 				// If the bit is set, it means we have counted all the host bits.
+	// 				hostBits++
+	// 			} else {
+	// 				// If the bit is not set, it means we have reached the network bits.
+	// 				break
+	// 			}
+	// 		}
+	// 		// We only need to check one byte, so we can break out of the loop.
+	// 		break
+	// 	}
+	// }
+
+	// // Increment only the least significant bits that belong to the host part
+	// for i := net.IPv4len - 1; i >= 0; i-- {
+	// 	if (maskBytes[i] & 0xFF) != 0xFF {
+	// 		incrementBits := 8 - ((i * 8) + (8 - hostBits))
+	// 		ipBytes[i] += 1 << incrementBits
+	// 		break
+	// 	}
+	// }
+
+	// Convert the bytes back to an IP address
+	nextIP := net.IP(ipBytes)
+
+	return nextIP
+}
+
 func main() {
 	db_file := getEnv("DB_FILE", "wg-easy.db")
 	db, err := sql.Open("sqlite3", db_file)
@@ -183,7 +310,9 @@ func main() {
 	defer db.Close()
 	fmt.Println("Connected to the SQLite database successfully.")
 
-	latestClient := getLatestClient("user_id")
+	latestClient := getLatestClient()
+	nextClient := latestClient
+	nextClient.ID += 1
 
 	fmt.Printf("Next Client ID: %d\n", latestClient.ID)
 	lastIp := net.ParseIP(latestClient.IPv4Address)
@@ -191,7 +320,36 @@ func main() {
 	if lastIp == nil {
 		fmt.Println("Invalid IP address")
 	} else {
-		fmt.Printf("Next Valid IP: %v\n", getNextIp(lastIp))
+		nextClient.IPv4Address = getNextIp(lastIp).String()
+		fmt.Printf("Next Valid IP: %v\n", nextClient.IPv4Address)
 	}
 
+	nextClient.IPv6Address = "::1"
+
+	network := getNetwork()
+	fmt.Printf("Got Network: %v\n", network)
+
+	networkParts := strings.Split(network.IPv4CIDR, "/")
+	fmt.Printf("Network CIDR: %s\n", networkParts[1])
+	fmt.Printf("Last Client:\n%v\n", latestClient)
+
+	nextClient.Name = "NewUser"
+	privateKeyBytes, _ := generatePrivateKey(nextClient.Name + "-priv")
+	nextClient.PrivateKey = string(privateKeyBytes)
+	publicKeyBytes, _ := generatePublicKey(privateKeyBytes, nextClient.Name+"-pub")
+	nextClient.PublicKey = string(publicKeyBytes)
+	preshareKeyBytes, _ := generatePreshareKey()
+	nextClient.PreSharedKey = string(preshareKeyBytes)
+	nextClient.AllowedIps = "10.8.0.0/24"
+	nextClient.ServerAllowedIps = nextClient.IPv4Address
+	nextClient.PersistentKeepalive = 0
+	nextClient.MTU = network.MTU
+	nextClient.DNS = "1.1.1.1"
+	nextClient.ServerEndpoint = "1.2.3.4"
+	// nextClient.Enabled = 1
+	// nextClient.CreatedAt = time.Now().String()
+	// nextClient.UpdatedAt = time.Now().String()
+	fmt.Printf("New Client:\n%v\n", nextClient)
+
+	insertNewUser(nextClient)
 }