8000 Network refactoring - fix some IPv6 DNS issues by sgryphon · Pull Request #9439 · espressif/arduino-esp32 · GitHub
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Network refactoring - fix some IPv6 DNS issues #9439

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Merged
merged 2 commits into from
Apr 3, 2024
Merged

Network refactoring - fix some IPv6 DNS issues #9439

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1825372
fix(dns): Handle IPv6 DNS server address results
sgryphon Apr 1, 2024
5634137
fix(dns): Use getaddrinfo for DNS, to fix some IPv6 issues
sgryphon Apr 3, 2024
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2 changes: 1 addition & 1 deletion libraries/Network/src/NetworkEvents.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ NetworkEvents::~NetworkEvents(){
}
}

static uint32_t _initial_bits = NET_DNS_IDLE_BIT;
static uint32_t _initial_bits = 0;

bool NetworkEvents::initNetworkEvents(){
if(!_arduino_event_group){
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3 changes: 0 additions & 3 deletions libraries/Network/src/NetworkEvents.h
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Expand Up @@ -28,9 +28,6 @@ static const int WIFI_SCANNING_BIT = BIT0;
static const int WIFI_SCAN_DONE_BIT= BIT1;
#endif

static const int NET_DNS_IDLE_BIT = BIT2;
static const int NET_DNS_DONE_BIT = BIT3;

#define NET_HAS_IP6_GLOBAL_BIT 0

ESP_EVENT_DECLARE_BASE(ARDUINO_EVENTS);
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29 changes: 29 additions & 0 deletions libraries/Network/src/NetworkInterface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -606,6 +606,35 @@ IPAddress NetworkInterface::dnsIP(uint8_t dns_no) const
if(esp_netif_get_dns_info(_esp_netif, dns_no?ESP_NETIF_DNS_BACKUP:ESP_NETIF_DNS_MAIN, &d) != ESP_OK){
return IPAddress();
}
if (d.ip.type == ESP_IPADDR_TYPE_V6){
// IPv6 from 4x uint32_t; byte order based on IPV62STR() in esp_netif_ip_addr.h
log_d("DNS got IPv6: " IPV6STR, IPV62STR(d.ip.u_addr.ip6));
uint32_t addr0 esp_netif_htonl(d.ip.u_addr.ip6.addr[0]);
uint32_t addr1 esp_netif_htonl(d.ip.u_addr.ip6.addr[1]);
uint32_t addr2 esp_netif_htonl(d.ip.u_addr.ip6.addr[2]);
uint32_t addr3 esp_netif_htonl(d.ip.u_addr.ip6.addr[3]);
return IPAddress(
(uint8_t)(addr0 >> 24) & 0xFF,
(uint8_t)(addr0 >> 16) & 0xFF,
(uint8_t)(addr0 >> 8) & 0xFF,
(uint8_t)addr0 & 0xFF,
(uint8_t)(addr1 >> 24) & 0xFF,
(uint8_t)(addr1 >> 16) & 0xFF,
(uint8_t)(addr1 >> 8) & 0xFF,
(uint8_t)addr1 & 0xFF,
(uint8_t)(addr2 >> 24) & 0xFF,
(uint8_t)(addr2 >> 16) & 0xFF,
(uint8_t)(addr2 >> 8) & 0xFF,
(uint8_t)addr2 & 0xFF,
(uint8_t)(addr3 >> 24) & 0xFF,
(uint8_t)(addr3 >> 16) & 0xFF,
(uint8_t)(addr3 >> 8) & 0xFF,
(uint8_t)addr3 & 0xFF,
d.ip.u_addr.ip6.zone
);
}
// IPv4 from single uint32_t
log_d("DNS IPv4: " IPSTR, IP2STR(&d.ip.u_addr.ip4));
return IPAddress(d.ip.u_addr.ip4.addr);
}

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99 changes: 35 additions & 64 deletions libraries/Network/src/NetworkManager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,11 @@
*/
#include "NetworkManager.h"
#include "NetworkInterface.h"
#include "IPAddress.h"
#include "esp_netif.h"
#include "lwip/ip_addr.h"
#include "lwip/dns.h"
#include "esp32-hal-log.h"
#include "esp_mac.h"
#include "netdb.h"

NetworkManager::NetworkManager(){

Expand All @@ -36,54 +36,16 @@ bool NetworkManager::begin(){
return initialized;
}

typedef struct gethostbynameParameters {
const char *hostname;
ip_addr_t addr;
uint8_t addr_type;
int result;
} gethostbynameParameters_t;

/**
* DNS callback
* @param name
* @param ipaddr
* @param callback_arg
*/
static void wifi_dns_found_callback(const char *name, const ip_addr_t *ipaddr, void *callback_arg)
{
gethostbynameParameters_t *parameters = static_cast<gethostbynameParameters_t *>(callback_arg);
if(ipaddr) {
if(parameters->result == 0){
memcpy(&(parameters->addr), ipaddr, sizeof(ip_addr_t));
parameters->result = 1;
}
} else {
parameters->result = -1;
}
Network.setStatusBits(NET_DNS_DONE_BIT);
}

/**
* Callback to execute dns_gethostbyname in lwIP's TCP/IP context
* @param param Parameters for dns_gethostbyname call
*/
static esp_err_t wifi_gethostbyname_tcpip_ctx(void *param)
{
gethostbynameParameters_t *parameters = static_cast<gethostbynameParameters_t *>(param);
return dns_gethostbyname_addrtype(parameters->hostname, &parameters->addr, &wifi_dns_found_callback, parameters, parameters->addr_type);
}

/**
* Resolve the given hostname to an IP address.
* @param aHostname Name to be resolved
* @param aResult IPAddress structure to store the returned IP address
* @return 1 if aIPAddrString was successfully converted to an IP address,
* else error code
*/
int NetworkManager::hostByName(const char* aHostname, IPAddress& aResult, bool preferV6)
int NetworkManager::hostByName(const char* aHostname, IPAddress& aResult)
{
err_t err = ERR_OK;
gethostbynameParameters_t params;

// This should generally check if we have a global address assigned to one of the interfaces.
// If such address is not assigned, there is no point in trying to get V6 from DNS as we will not be able to reach it.
Expand All @@ -97,32 +59,41 @@ int NetworkManager::hostByName(const char* aHostname, IPAddress& aResult, bool p
}

aResult = static_cast<uint32_t>(0);
params.hostname = aHostname;
params.addr_type = (preferV6 || hasGlobalV6)?LWIP_DNS_ADDRTYPE_IPV6_IPV4:LWIP_DNS_ADDRTYPE_IPV4;
params.result = 0;
aResult.to_ip_addr_t(&(params.addr));

if (!aResult.fromString(aHostname)) {
Network.waitStatusBits(NET_DNS_IDLE_BIT, 16000);
Network.clearStatusBits(NET_DNS_IDLE_BIT | NET_DNS_DONE_BIT);
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Removing any reference to NET_DNS_IDLE_BIT and NET_DNS_DONE_BIT is also necessary. And if Network.[get|set|wait]StatusBits are only used for those two flags, then we can probably get rid of that too.

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I'll look at cleaning up.


err = esp_netif_tcpip_exec(wifi_gethostbyname_tcpip_ctx, &params);
if (err == ERR_OK) {
aResult.from_ip_addr_t(&(params.addr));
} else if (err == ERR_INPROGRESS) {
Network.waitStatusBits(NET_DNS_DONE_BIT, 15000); //real internal timeout in lwip library is 14[s]
Network.clearStatusBits(NET_DNS_DONE_BIT);
if (params.result == 1) {
aResult.from_ip_addr_t(&(params.addr));
err = ERR_OK;
}
}
Network.setStatusBits(NET_DNS_IDLE_BIT);

// First check if the host parses as a literal address
if (aResult.fromString(aHostname)) {
return 1;
}
if (err == ERR_OK) {

const char *servname = "0";
struct addrinfo *res;
const struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
};
err = lwip_getaddrinfo(aHostname, servname, &hints, &res);
if (err == ERR_OK)
{
if (res->ai_family == AF_INET6)
{
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)res->ai_addr;
// As an array of u8_t
aResult = IPAddress(IPv6, ipv6->sin6_addr.s6_addr);
log_d("DNS found IPv6 %s", aResult.toString().c_str());
}
else
{
struct sockaddr_in *ipv4 = (struct sockaddr_in *)res->ai_addr;
// As a single u32_t
aResult = IPAddress(ipv4->sin_addr.s_addr);
log_d("DNS found IPv4 %s", aResult.toString().c_str());
}

lwip_freeaddrinfo(res);
return 1;
}
log_e("DNS Failed for '%s' with error '%d' and result '%d'", aHostname, err, params.result);

log_e("DNS Failed for '%s' with error '%d'", aHostname, err);
return err;
}

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2 changes: 1 addition & 1 deletion libraries/Network/src/NetworkManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ class NetworkManager : public NetworkEvents, public Printable {
NetworkManager();

bool begin();
int hostByName(const char *aHostname, IPAddress &aResult, bool preferV6=false);
int hostByName(const char *aHostname, IPAddress &aResult);
uint8_t * macAddress(uint8_t * mac);
String macAddress();

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4 changes: 2 additions & 2 deletions libraries/WiFi/src/WiFiGeneric.cpp
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Expand Up @@ -794,9 +794,9 @@ bool WiFiGenericClass::setDualAntennaConfig(uint8_t gpio_ant1, uint8_t gpio_ant2
/*
* Deprecated Methods
*/
int WiFiGenericClass::hostByName(const char* aHostname, IPAddress& aResult, bool preferV6)
int WiFiGenericClass::hostByName(const char* aHostname, IPAddress& aResult)
{
return Network.hostByName(aHostname, aResult, preferV6);
return Network.hostByName(aHostname, aResult);
}

IPAddress WiFiGenericClass::calculateNetworkID(IPAddress ip, IPAddress subnet) {
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2 changes: 1 addition & 1 deletion libraries/WiFi/src/WiFiGeneric.h
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Expand Up @@ -115,7 +115,7 @@ class WiFiGenericClass
static void useStaticBuffers(bool bufferMode);
static bool useStaticBuffers();

static int hostByName(const char *aHostname, IPAddress &aResult, bool preferV6=false);
static int hostByName(const char *aHostname, IPAddress &aResult);

static IPAddress calculateNetworkID(IPAddress ip, IPAddress subnet);
static IPAddress calculateBroadcast(IPAddress ip, IPAddress subnet);
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