FTL/api.c

/* Pi-hole: A black hole for Internet advertisements
*  (c) 2017 Pi-hole, LLC (https://pi-hole.net)
*  Network-wide ad blocking via your own hardware.
*
*  FTL Engine
*  General API commands
*
*  This file is copyright under the latest version of the EUPL.
*  Please see LICENSE file for your rights under this license. */

#include "FTL.h"
#include "api.h"

void sendAPIResponse(int sock, char type, char http_code) {
	char *http_status;

	switch(http_code) {
		default:
		case OK:
			http_status = "200 OK";
			break;
		case BAD_REQUEST:
			http_status = "400 Bad Request";
			break;
		case INTERNAL_ERROR:
			http_status = "500 Internal Server Error";
			break;
		case NOT_FOUND:
			http_status = "404 Not Found";
			break;
	}

	if(type == APIH)
	{
		// Send header only for full HTTP requests
		ssend(sock,
		      "HTTP/1.0 %s\nServer: FTL\nCache-Control: no-cache\nAccess-Control-Allow-Origin: *\n"
				      "Content-Type: application/json\n\n{", http_status);
	}
}

bool matchesRegex(char *regex_expression, char *input) {
	regex_t regex;
	int result;

	result = regcomp(&regex, regex_expression, REG_EXTENDED);

	if(result != 0) {
		logg("Failed to compile regex");
		exit(EXIT_FAILURE);
	}

	result = regexec(&regex, input, 0, NULL, 0);
	regfree(&regex);

	return result == 0;
}

bool isValidDomain(char *domain) {
	char *valid_chars_regex = "^((-|_)*[a-z\\d]((-|_)*[a-z\\d])*(-|_)*)(\\.(-|_)*([a-z\\d]((-|_)*[a-z\\d])*))*$";
	char *total_length_regex = "^.{1,253}$";
	char *label_length_regex = "^[^\\.]{1,63}(\\.[^\\.]{1,63})*$";

	return matchesRegex(valid_chars_regex, domain) &&
			matchesRegex(total_length_regex, domain) &&
			matchesRegex(label_length_regex, domain);
}