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Add DNS forwarder to DNSServer (#7237)

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The key functions added are:

`bool enableForwarder(const String &domainName=emptyString, const IPAddress &dns=uint32_t)0)`

If specified, `enableForwarder` will update the `domainName` that is used to match DNS request to this AP's IP Address. A non-matching request will be forwarded to the DNS server specified by `dns`. 

Returns `true` on success.

Returns `false`, 
 * when forwarding `dns` is not set, or 
 * unable to allocate resources for managing the DNS forward function.

`void disableForwarder(const String &domainName=emptyString, bool freeResources=false)`

`disableForwarder` will stop forwarding DNS requests. If specified, updates the `domainName` that is matched for returning this AP's IP Address.
Optionally, resources used for the DNS forward function can be freed.
This commit is contained in:
M Hightower
2022-05-08 04:04:34 -07:00
committed by GitHub
parent 1a49a0449b
commit bcb5464167
8 changed files with 1432 additions and 47 deletions
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84
libraries/DNSServer/examples/NAPTCaptivePortal/tools.ino Normal file
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/*
These functions may exist in other projects
*/
#if LWIP_FEATURES && !LWIP_IPV6
/*
Returns a descriptive string for WiFi.status() value
*/
String getWiFiStatusString(uint32_t status) {
const __FlashStringHelper* r;
switch (status) {
case WL_IDLE_STATUS:
r = F("WL_IDLE_STATUS");
break;
case WL_NO_SSID_AVAIL:
r = F("WL_NO_SSID_AVAIL");
break;
case WL_SCAN_COMPLETED:
r = F("WL_SCAN_COMPLETED");
break;
case WL_CONNECTED:
r = F("WL_CONNECTED");
break;
case WL_CONNECT_FAILED:
r = F("WL_CONNECT_FAILED");
break;
case WL_CONNECTION_LOST:
r = F("WL_CONNECTION_LOST");
break;
case WL_DISCONNECTED:
r = F("WL_DISCONNECTED");
break;
case WL_NO_SHIELD:
r = F("WL_NO_SHIELD");
break;
default:
return String(F("Unknown: 0x")) + String(status, HEX);
}
return String(r);
}
/*
Returns a single charcter to append to a "802.11" string to describe the PHY
mode of a WiFi device. Can be used with the value returned by WiFi.getPhyMode().
*/
char getPhyModeChar(WiFiPhyMode_t i) {
switch (i) {
case WIFI_PHY_MODE_11B:
return 'b'; // = 1
case WIFI_PHY_MODE_11G:
return 'g'; // = 2,
case WIFI_PHY_MODE_11N:
return 'n'; // = 3,
default:
break;
}
return '?';
}
/*
Return a String of 6 colon separated hex bytes.
This format is commonly used when printing 6 byte MAC addresses.
*/
String macToString(const unsigned char* mac) {
char buf[20];
int rc = snprintf(buf, sizeof(buf), PSTR("%02X:%02X:%02X:%02X:%02X:%02X"),
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
if (rc < 0 || rc >= (int)sizeof(buf)) {
return emptyString;
}
return String(buf);
}
#endif // LWIP_FEATURES && !LWIP_IPV6