package home import ( "encoding/json" "fmt" "net" "net/http" "github.com/AdguardTeam/golibs/log" ) // clientJSON is a common structure used by several handlers to deal with // clients. Some of the fields are only necessary in one or two handlers and // are thus made pointers with an omitempty tag. // // TODO(a.garipov): Consider using nullbool and an optional string here? Or // split into several structs? type clientJSON struct { // Disallowed, if non-nil and false, means that the client's IP is // allowed. Otherwise, the IP is blocked. Disallowed *bool `json:"disallowed,omitempty"` // DisallowedRule is the rule due to which the client is disallowed. // If Disallowed is true and this string is empty, the client IP is // disallowed by the "allowed IP list", that is it is not included in // the allowlist. DisallowedRule *string `json:"disallowed_rule,omitempty"` WHOISInfo *RuntimeClientWHOISInfo `json:"whois_info,omitempty"` Name string `json:"name"` BlockedServices []string `json:"blocked_services"` IDs []string `json:"ids"` Tags []string `json:"tags"` Upstreams []string `json:"upstreams"` FilteringEnabled bool `json:"filtering_enabled"` ParentalEnabled bool `json:"parental_enabled"` SafeBrowsingEnabled bool `json:"safebrowsing_enabled"` SafeSearchEnabled bool `json:"safesearch_enabled"` UseGlobalBlockedServices bool `json:"use_global_blocked_services"` UseGlobalSettings bool `json:"use_global_settings"` } type runtimeClientJSON struct { WHOISInfo *RuntimeClientWHOISInfo `json:"whois_info"` Name string `json:"name"` Source string `json:"source"` IP net.IP `json:"ip"` } type clientListJSON struct { Clients []*clientJSON `json:"clients"` RuntimeClients []runtimeClientJSON `json:"auto_clients"` Tags []string `json:"supported_tags"` } // respond with information about configured clients func (clients *clientsContainer) handleGetClients(w http.ResponseWriter, _ *http.Request) { data := clientListJSON{} clients.lock.Lock() defer clients.lock.Unlock() for _, c := range clients.list { cj := clientToJSON(c) data.Clients = append(data.Clients, cj) } clients.ipToRC.Range(func(ip net.IP, v interface{}) (cont bool) { rc, ok := v.(*RuntimeClient) if !ok { log.Error("dns: bad type %T in ipToRC for %s", v, ip) return true } cj := runtimeClientJSON{ WHOISInfo: rc.WHOISInfo, Name: rc.Host, IP: ip, } cj.Source = "etc/hosts" switch rc.Source { case ClientSourceDHCP: cj.Source = "DHCP" case ClientSourceRDNS: cj.Source = "rDNS" case ClientSourceARP: cj.Source = "ARP" case ClientSourceWHOIS: cj.Source = "WHOIS" } data.RuntimeClients = append(data.RuntimeClients, cj) return true }) data.Tags = clientTags w.Header().Set("Content-Type", "application/json") e := json.NewEncoder(w).Encode(data) if e != nil { httpError(w, http.StatusInternalServerError, "Failed to encode to json: %v", e) return } } // Convert JSON object to Client object func jsonToClient(cj clientJSON) (c *Client) { return &Client{ Name: cj.Name, IDs: cj.IDs, Tags: cj.Tags, UseOwnSettings: !cj.UseGlobalSettings, FilteringEnabled: cj.FilteringEnabled, ParentalEnabled: cj.ParentalEnabled, SafeSearchEnabled: cj.SafeSearchEnabled, SafeBrowsingEnabled: cj.SafeBrowsingEnabled, UseOwnBlockedServices: !cj.UseGlobalBlockedServices, BlockedServices: cj.BlockedServices, Upstreams: cj.Upstreams, } } // Convert Client object to JSON func clientToJSON(c *Client) (cj *clientJSON) { return &clientJSON{ Name: c.Name, IDs: c.IDs, Tags: c.Tags, UseGlobalSettings: !c.UseOwnSettings, FilteringEnabled: c.FilteringEnabled, ParentalEnabled: c.ParentalEnabled, SafeSearchEnabled: c.SafeSearchEnabled, SafeBrowsingEnabled: c.SafeBrowsingEnabled, UseGlobalBlockedServices: !c.UseOwnBlockedServices, BlockedServices: c.BlockedServices, Upstreams: c.Upstreams, } } // Add a new client func (clients *clientsContainer) handleAddClient(w http.ResponseWriter, r *http.Request) { cj := clientJSON{} err := json.NewDecoder(r.Body).Decode(&cj) if err != nil { httpError(w, http.StatusBadRequest, "failed to process request body: %s", err) return } c := jsonToClient(cj) ok, err := clients.Add(c) if err != nil { httpError(w, http.StatusBadRequest, "%s", err) return } if !ok { httpError(w, http.StatusBadRequest, "Client already exists") return } onConfigModified() } // Remove client func (clients *clientsContainer) handleDelClient(w http.ResponseWriter, r *http.Request) { cj := clientJSON{} err := json.NewDecoder(r.Body).Decode(&cj) if err != nil { httpError(w, http.StatusBadRequest, "failed to process request body: %s", err) return } if len(cj.Name) == 0 { httpError(w, http.StatusBadRequest, "client's name must be non-empty") return } if !clients.Del(cj.Name) { httpError(w, http.StatusBadRequest, "Client not found") return } onConfigModified() } type updateJSON struct { Name string `json:"name"` Data clientJSON `json:"data"` } // Update client's properties func (clients *clientsContainer) handleUpdateClient(w http.ResponseWriter, r *http.Request) { dj := updateJSON{} err := json.NewDecoder(r.Body).Decode(&dj) if err != nil { httpError(w, http.StatusBadRequest, "failed to process request body: %s", err) return } if len(dj.Name) == 0 { httpError(w, http.StatusBadRequest, "Invalid request") return } c := jsonToClient(dj.Data) err = clients.Update(dj.Name, c) if err != nil { httpError(w, http.StatusBadRequest, "%s", err) return } onConfigModified() } // Get the list of clients by IP address list func (clients *clientsContainer) handleFindClient(w http.ResponseWriter, r *http.Request) { q := r.URL.Query() data := []map[string]*clientJSON{} for i := 0; i < len(q); i++ { idStr := q.Get(fmt.Sprintf("ip%d", i)) if idStr == "" { break } ip := net.ParseIP(idStr) c, ok := clients.Find(idStr) var cj *clientJSON if !ok { cj = clients.findRuntime(ip, idStr) } else { cj = clientToJSON(c) disallowed, rule := clients.dnsServer.IsBlockedClient(ip, idStr) cj.Disallowed, cj.DisallowedRule = &disallowed, &rule } data = append(data, map[string]*clientJSON{ idStr: cj, }) } w.Header().Set("Content-Type", "application/json") err := json.NewEncoder(w).Encode(data) if err != nil { httpError(w, http.StatusInternalServerError, "Couldn't write response: %s", err) } } // findRuntime looks up the IP in runtime and temporary storages, like // /etc/hosts tables, DHCP leases, or blocklists. cj is guaranteed to be // non-nil. func (clients *clientsContainer) findRuntime(ip net.IP, idStr string) (cj *clientJSON) { rc, ok := clients.FindRuntimeClient(ip) if !ok { // It is still possible that the IP used to be in the runtime // clients list, but then the server was reloaded. So, check // the DNS server's blocked IP list. // // See https://github.com/AdguardTeam/AdGuardHome/issues/2428. disallowed, rule := clients.dnsServer.IsBlockedClient(ip, idStr) cj = &clientJSON{ IDs: []string{idStr}, Disallowed: &disallowed, DisallowedRule: &rule, WHOISInfo: &RuntimeClientWHOISInfo{}, } return cj } cj = &clientJSON{ Name: rc.Host, IDs: []string{idStr}, WHOISInfo: rc.WHOISInfo, } disallowed, rule := clients.dnsServer.IsBlockedClient(ip, idStr) cj.Disallowed, cj.DisallowedRule = &disallowed, &rule return cj } // RegisterClientsHandlers registers HTTP handlers func (clients *clientsContainer) registerWebHandlers() { httpRegister(http.MethodGet, "/control/clients", clients.handleGetClients) httpRegister(http.MethodPost, "/control/clients/add", clients.handleAddClient) httpRegister(http.MethodPost, "/control/clients/delete", clients.handleDelClient) httpRegister(http.MethodPost, "/control/clients/update", clients.handleUpdateClient) httpRegister(http.MethodGet, "/control/clients/find", clients.handleFindClient) }