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Merge pull request #3451 from cesanta/dns

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add entropy to DNS txnid
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Sergey Lyubka authored and GitHub committed 2026-03-02 09:38:51 +00:00
2 parents dfcfdfd0f7 ec032181c6
commit 27897d5514
2 files changed
+12 -4
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mongoose.c
+6 -2
View File
@@ -376,8 +376,12 @@ static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
mg_error(c, "resolve OOM");
} else {
struct dns_data *reqs = (struct dns_data *) c->mgr->active_dns_requests;
d->txnid = reqs ? (uint16_t) (reqs->txnid + 1) : 1;
d->next = (struct dns_data *) c->mgr->active_dns_requests;
uint16_t id;
mg_random(&id, sizeof(uint16_t));
// TODO(): traverse reqs and check id != reqs->txnid; repeat otherwise
if (reqs != NULL) id = (uint16_t) (reqs->txnid + 1); // no collision
d->txnid = id;
d->next = reqs;
c->mgr->active_dns_requests = d;
d->expire = mg_millis() + (uint64_t) ms;
d->c = c;
src/dns.c
+6 -2
View File
@@ -255,8 +255,12 @@ static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
mg_error(c, "resolve OOM");
} else {
struct dns_data *reqs = (struct dns_data *) c->mgr->active_dns_requests;
d->txnid = reqs ? (uint16_t) (reqs->txnid + 1) : 1;
d->next = (struct dns_data *) c->mgr->active_dns_requests;
uint16_t id;
mg_random(&id, sizeof(uint16_t));
// TODO(): traverse reqs and check id != reqs->txnid; repeat otherwise
if (reqs != NULL) id = (uint16_t) (reqs->txnid + 1); // no collision
d->txnid = id;
d->next = reqs;
c->mgr->active_dns_requests = d;
d->expire = mg_millis() + (uint64_t) ms;
d->c = c;