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Merge pull request #3203 from cesanta/dns

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Built-in TCP/IP (re-)starts DNS connection on DHCP link up
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Sergey Lyubka authored and GitHub committed 2025-08-01 12:13:39 +01:00
2 parents 19933a4673 393063428e
commit b19cf8654f
6 files changed
+81 -29
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tutorials/tcpip/tap-driver/main.c
+5 -7
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@@ -42,21 +42,20 @@ static size_t tap_rx(void *buf, size_t len, struct mg_tcpip_if *ifp) {
return (size_t) received;
}
char *s_dns = NULL, *s_sntp = NULL;
char *s_sntp = NULL;
static void mif_fn(struct mg_tcpip_if *ifp, int ev, void *ev_data) {
if (ev == MG_TCPIP_EV_ST_CHG) {
MG_INFO(("State change: %u", *(uint8_t *) ev_data));
} else if (ev == MG_TCPIP_EV_DHCP_DNS) {
mg_free(s_dns);
s_dns = mg_mprintf("udp://%M:53", mg_print_ip4, (uint32_t *) ev_data);
ifp->mgr->dns4.url = s_dns;
MG_INFO(("Set DNS to %s", ifp->mgr->dns4.url));
MG_INFO(("Got DNS from DHCP: %M", mg_print_ip4, (uint32_t *) ev_data));
} else if (ev == MG_TCPIP_EV_DHCP_SNTP) {
MG_INFO(("Got SNTP from DHCP: %M", mg_print_ip4, (uint32_t *) ev_data));
mg_free(s_sntp);
s_sntp = mg_mprintf("udp://%M:123", mg_print_ip4, (uint32_t *) ev_data);
MG_INFO(("Set SNTP to %s", s_sntp));
MG_INFO(("Set SNTP server to %s", s_sntp)); // though net.c may not use it.
}
(void) ifp;
}
int main(int argc, char *argv[]) {
@@ -128,7 +127,6 @@ int main(int argc, char *argv[]) {
web_init(&mgr);
while (s_signo == 0) mg_mgr_poll(&mgr, 100); // Infinite event loop
mg_free(s_dns);
mg_free(s_sntp);
mg_mgr_free(&mgr);
close(fd);