feat: mDNS-Responder für _ninlight._tcp

src/net/nl_mdns.c

@@ -1,5 +1,80 @@
-#include "net/nl_mdns.h"
+#include <stdio.h>
+#include <string.h>
 
-/* Placeholder until the mDNS responder lands (plan 2, task 7). */
+#include "wm_include.h"
-void nl_mdns_on_ip_up(void) {}
+#include "lwip/apps/mdns.h"
-void nl_mdns_set_name(const char *name) { (void)name; }
+#include "lwip/tcpip.h"
+
+#include "config/nl_settings.h"
+#include "net/nl_http_server.h"
+#include "net/nl_mdns.h"
+#include "net/nl_names.h"
+#include "net/nl_wifi.h"
+
+#define NL_MDNS_TTL 120
+
+static bool s_started;
+static char s_name[NL_NAME_LEN];
+static char s_mac[18];
+
+static void add_txt(struct mdns_service *service, const char *key, const char *value)
+{
+    char item[64];
+    int n = snprintf(item, sizeof item, "%s=%s", key, value);
+    if (n > 0)
+        mdns_resp_add_service_txtitem(service, item, (u8_t)(n < (int)sizeof item ? n : (int)sizeof item - 1));
+}
+
+/* tcpip thread */
+static void txt_cb(struct mdns_service *service, void *data)
+{
+    char name[NL_NAME_LEN];
+    u32 sr;
+
+    (void)data;
+    sr = tls_os_set_critical();
+    memcpy(name, s_name, sizeof name);
+    tls_os_release_critical(sr);
+    add_txt(service, "type", NINLIGHT_DEVICE_ID);
+    add_txt(service, "fw", NINLIGHT_FW_VERSION);
+    add_txt(service, "mac", s_mac);
+    add_txt(service, "name", name);
+}
+
+/* tcpip thread */
+static void announce(void *arg)
+{
+    struct netif *nif = tls_get_netif();
+
+    (void)arg;
+    if (!nif)
+        return;
+    if (!s_started) {
+        mdns_resp_init();
+        if (mdns_resp_add_netif(nif, nl_wifi_hostname(), NL_MDNS_TTL) == ERR_OK &&
+            mdns_resp_add_service(nif, nl_wifi_hostname(), "_ninlight", DNSSD_PROTO_TCP, NL_HTTP_PORT, NL_MDNS_TTL,
+                                  txt_cb, NULL) == ERR_OK)
+            s_started = true;
+        printf("mdns: %s.local _ninlight._tcp %s\r\n", nl_wifi_hostname(), s_started ? "up" : "failed");
+    } else {
+        mdns_resp_netif_settings_changed(nif); /* re-announce: new IP or TXT */
+    }
+}
+
+void nl_mdns_on_ip_up(void)
+{
+    uint8_t mac[6];
+    nl_wifi_mac(mac);
+    nl_names_mac_str(mac, s_mac);
+    tcpip_callback(announce, NULL);
+}
+
+void nl_mdns_set_name(const char *name)
+{
+    u32 sr = tls_os_set_critical();
+    strncpy(s_name, name, sizeof s_name - 1);
+    s_name[sizeof s_name - 1] = '\0';
+    tls_os_release_critical(sr);
+    if (s_started)
+        tcpip_callback(announce, NULL);
+}