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Fix #1532 - improve ipv6 DNS lookup

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This commit is contained in:
Sergey Lyubka 2022-04-22 20:44:53 +01:00
parent 93ff3e4d1f
commit a7cbc19755
4 changed files with 10 additions and 4 deletions
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6
mongoose.c
View File

@ -279,7 +279,8 @@ static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
mg_ntoa(&d->c->rem, buf, sizeof(buf))));
mg_connect_resolved(d->c);
#if MG_ENABLE_IPV6
} else if (dm.addr.is_ip6 == false && dm.name[0] != '\0') {
} else if (dm.addr.is_ip6 == false && dm.name[0] != '\0' &&
c->mgr->use_dns6 == false) {
struct mg_str x = mg_str(dm.name);
mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
#endif
@ -374,7 +375,8 @@ void mg_resolve(struct mg_connection *c, const char *url) {
mg_connect_resolved(c);
} else {
// host is not an IP, send DNS resolution request
mg_sendnsreq(c, &host, c->mgr->dnstimeout, &c->mgr->dns4, false);
struct mg_dns *dns = c->mgr->use_dns6 ? &c->mgr->dns6 : &c->mgr->dns4;
mg_sendnsreq(c, &host, c->mgr->dnstimeout, dns, c->mgr->use_dns6);
}
}

1
mongoose.h
View File

@ -898,6 +898,7 @@ struct mg_mgr {
struct mg_dns dns4; // DNS for IPv4
struct mg_dns dns6; // DNS for IPv6
int dnstimeout; // DNS resolve timeout in milliseconds
bool use_dns6; // Use DNS6 server by default, see #1532
unsigned long nextid; // Next connection ID
void *userdata; // Arbitrary user data pointer
uint16_t mqtt_id; // MQTT IDs for pub/sub

6
src/dns.c
View File

@ -167,7 +167,8 @@ static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
mg_ntoa(&d->c->rem, buf, sizeof(buf))));
mg_connect_resolved(d->c);
#if MG_ENABLE_IPV6
} else if (dm.addr.is_ip6 == false && dm.name[0] != '\0') {
} else if (dm.addr.is_ip6 == false && dm.name[0] != '\0' &&
c->mgr->use_dns6 == false) {
struct mg_str x = mg_str(dm.name);
mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
#endif
@ -262,6 +263,7 @@ void mg_resolve(struct mg_connection *c, const char *url) {
mg_connect_resolved(c);
} else {
// host is not an IP, send DNS resolution request
mg_sendnsreq(c, &host, c->mgr->dnstimeout, &c->mgr->dns4, false);
struct mg_dns *dns = c->mgr->use_dns6 ? &c->mgr->dns6 : &c->mgr->dns4;
mg_sendnsreq(c, &host, c->mgr->dnstimeout, dns, c->mgr->use_dns6);
}
}

1
src/net.h
View File

@ -23,6 +23,7 @@ struct mg_mgr {
struct mg_dns dns4; // DNS for IPv4
struct mg_dns dns6; // DNS for IPv6
int dnstimeout; // DNS resolve timeout in milliseconds
bool use_dns6; // Use DNS6 server by default, see #1532
unsigned long nextid; // Next connection ID
void *userdata; // Arbitrary user data pointer
uint16_t mqtt_id; // MQTT IDs for pub/sub