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Sergio R. Caprile committed 2026-11-11 17:51:49 -03:00
1 parent d47cfa183d
commit 3a4f044e41
2 files changed
+6 -4
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tutorials/udp/captive-dns-server/main.c
+3 -2
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@@ -25,10 +25,11 @@ static void fn(struct mg_connection *c, int ev, void *ev_data) {
c->is_hexdumping = 1;
} else if (ev == MG_EV_READ) {
struct mg_dns_rr rr; // Parse first question, offset 12 is header size
char buf[512];
size_t n = mg_dns_parse_rr(c->recv.buf, c->recv.len, 12, true, &rr);
MG_INFO(("DNS request parsed, result=%d", (int) n));
if (n > 0) {
char buf[512];
if (n > 0 &&
n <= sizeof(buf) - sizeof(struct mg_dns_header) - sizeof(answer)) {
struct mg_dns_header *h = (struct mg_dns_header *) buf;
memset(buf, 0, sizeof(buf)); // Clear the whole datagram
h->txnid = ((struct mg_dns_header *) c->recv.buf)->txnid; // Copy tnxid