From e0f32fb48caf9397ac87fdd6c6597d888f9a8a40 Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Sun, 7 Jul 2024 15:20:11 +0530
Subject: api/dns: init

---
 api/dns.go  | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 api/main.go | 15 +++++++++------
 2 files changed, 73 insertions(+), 6 deletions(-)
 create mode 100644 api/dns.go

(limited to 'api')

diff --git a/api/dns.go b/api/dns.go
new file mode 100644
index 0000000..f8d345c
--- /dev/null
+++ b/api/dns.go
@@ -0,0 +1,64 @@
+package api
+
+import (
+	"encoding/json"
+	"log"
+	"net"
+
+	"sinanmohd.com/redq/dns"
+)
+
+type DnsResp map[string]string
+
+func handleDnsBlock(conn net.Conn, d *dns.Dns, domains []string) {
+	resp := make(DnsResp)
+
+	for _, domain := range domains {
+		err := d.Block(domain)
+		if err != nil {
+			resp[domain] = err.Error()
+		} else {
+			resp[domain] = "blocked"
+		}
+	}
+
+	buf, err := json.Marshal(resp)
+	if err != nil {
+		log.Printf("marshaling json: %s", err)
+		return
+	}
+
+	conn.Write(buf)
+}
+
+func handleDnsUnblock(conn net.Conn, d *dns.Dns, domains []string) {
+	resp := make(DnsResp)
+
+	for _, domain := range domains {
+		err := d.Unblock(domain)
+		if err != nil {
+			resp[domain] = err.Error()
+		} else {
+			resp[domain] = "unblocked"
+		}
+	}
+
+	buf, err := json.Marshal(resp)
+	if err != nil {
+		log.Printf("marshaling json: %s", err)
+		return
+	}
+
+	conn.Write(buf)
+}
+
+func handleDns(conn net.Conn, d *dns.Dns, domains []string, action string) {
+	switch action {
+	case "block":
+		handleDnsBlock(conn, d, domains)
+	case "unblock":
+		handleDnsUnblock(conn, d, domains)
+	default:
+		log.Printf("handling dns: invalid action '%s'", action)
+	}
+}
diff --git a/api/main.go b/api/main.go
index 32f7d08..eb8715f 100644
--- a/api/main.go
+++ b/api/main.go
@@ -7,6 +7,7 @@ import (
 	"net"
 
 	"sinanmohd.com/redq/db"
+	"sinanmohd.com/redq/dns"
 	"sinanmohd.com/redq/usage"
 )
 
@@ -16,9 +17,9 @@ const (
 )
 
 type ApiReq struct {
-	Type   string `json:"type"`
-	Action string `json:"action"`
-	Arg    string `json:"arg"`
+	Type   string   `json:"type"`
+	Action string   `json:"action"`
+	Arg    []string `json:"arg"`
 }
 
 type Api struct {
@@ -42,7 +43,7 @@ func New() (*Api, error) {
 	return &a, nil
 }
 
-func (a *Api) Run(u *usage.Usage, queries *db.Queries, ctxDb context.Context) {
+func (a *Api) Run(u *usage.Usage, d *dns.Dns, queries *db.Queries, ctxDb context.Context) {
 	for {
 		conn, err := a.sock.Accept()
 		if err != nil {
@@ -50,11 +51,11 @@ func (a *Api) Run(u *usage.Usage, queries *db.Queries, ctxDb context.Context) {
 			continue
 		}
 
-		go handleConn(conn, u, queries, ctxDb)
+		go handleConn(conn, u, d, queries, ctxDb)
 	}
 }
 
-func handleConn(conn net.Conn, u *usage.Usage, queries *db.Queries, ctxDb context.Context) {
+func handleConn(conn net.Conn, u *usage.Usage, d *dns.Dns, queries *db.Queries, ctxDb context.Context) {
 	defer conn.Close()
 	var req ApiReq
 	buf := make([]byte, bufSize)
@@ -76,6 +77,8 @@ func handleConn(conn net.Conn, u *usage.Usage, queries *db.Queries, ctxDb contex
 		handleBandwidth(conn, u)
 	case "usage":
 		handleUsage(conn, u, queries, ctxDb)
+	case "dns":
+		handleDns(conn, d, req.Arg, req.Action)
 	default:
 		log.Printf("invalid request type: %s", req.Type)
 	}
-- 
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