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Built-in TCP/IP (re-)starts DNS connection on link up

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Sergio R. Caprile committed 2025-07-14 15:06:31 -03:00
1 parent 1494f5e831
commit 393063428e
6 files changed
+81 -31
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src/net_builtin.c
+21 -1
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@@ -407,6 +407,8 @@ static void rx_icmp(struct mg_tcpip_if *ifp, struct pkt *pkt) {
}
}
static void setdns4(struct mg_tcpip_if *ifp, uint32_t *ip);
static void rx_dhcp_client(struct mg_tcpip_if *ifp, struct pkt *pkt) {
uint32_t ip = 0, gw = 0, mask = 0, lease = 0, dns = 0, sntp = 0;
uint8_t msgtype = 0, state = ifp->state;
@@ -455,8 +457,10 @@ static void rx_dhcp_client(struct mg_tcpip_if *ifp, struct pkt *pkt) {
ifp->state = MG_TCPIP_STATE_IP; // BOUND state
mg_random(&rand, sizeof(rand));
srand((unsigned int) (rand + mg_millis()));
if (ifp->enable_req_dns && dns != 0)
if (ifp->enable_req_dns && dns != 0) {
setdns4(ifp, &dns);
mg_tcpip_call(ifp, MG_TCPIP_EV_DHCP_DNS, &dns);
}
if (ifp->enable_req_sntp && sntp != 0)
mg_tcpip_call(ifp, MG_TCPIP_EV_DHCP_SNTP, &sntp);
} else if (ifp->state == MG_TCPIP_STATE_READY && ifp->ip == ip) { // renew
@@ -1117,6 +1121,7 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
void mg_tcpip_free(struct mg_tcpip_if *ifp) {
mg_free(ifp->recv_queue.buf);
mg_free(ifp->tx.buf);
mg_free(ifp->dns4_url);
}
static void send_syn(struct mg_connection *c) {
@@ -1283,4 +1288,19 @@ void mg_multicast_add(struct mg_connection *c, char *ip) {
c->mgr->ifp->update_mac_hash_table = true; // mark dirty
}
bool mg_dnsc_init(struct mg_mgr *mgr, struct mg_dns *dnsc);
static void setdns4(struct mg_tcpip_if *ifp, uint32_t *ip) {
struct mg_dns *dnsc;
mg_free(ifp->dns4_url);
ifp->dns4_url = mg_mprintf("udp://%M:53", mg_print_ip4, ip);
dnsc = &ifp->mgr->dns4;
dnsc->url = (const char *) ifp->dns4_url;
MG_DEBUG(("Set DNS URL to %s", dnsc->url));
if (ifp->mgr->use_dns6) return;
if (dnsc->c != NULL) mg_close_conn(dnsc->c);
if (!mg_dnsc_init(ifp->mgr, dnsc)) // create DNS connection
MG_ERROR(("DNS connection creation failed"));
}
#endif // MG_ENABLE_TCPIP