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/* $Id$ */
/*
 * Copyright (c) 2005 Dimitri Sokolyuk <demon@vhost.dyndns.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "request.h"
#include "connect.h"
#include "version.h"

extern int debug;
extern int verbose;

#define BUFLEN 1024

static int
build_request(struct dd_request *req, char *buf)
{
	snprintf(buf, BUFLEN, "GET /nic/update?");
	if (req->system != NULL)
		snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
			"system=%s&", req->system);
	snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
		"hostname=%s", req->hostname);
	if (req->myip != NULL)
		snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
			"&myip=%s", req->myip);
	if (req->wildcard != NULL)
		snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
			"&wildcard=%s", req->wildcard);
	if (req->mx != NULL) {
		snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
			"&mx=%s", req->mx);
		if (req->backmx != NULL)
			snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
				"&backmx=%s", req->backmx);	
	}
	if (req->offline != NULL)
		snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
			"&offline=%s", req->offline);
	snprintf(buf + strlen(buf), BUFLEN - strlen(buf),
		" HTTP/1.0\r\n"
		"Host: %s\r\n"
		"Authorization: Basic %s\r\n"
		"User-Agent: %s/%s\r\n"
		"Connection: close\r\n\r\n",
		DYNDNSHOST, req->auth, USERAGENT, VERSION);

	return 0;
}

#define RET_OK		0
#define RET_ERR		1

static struct {
	const char *code;
	const char *message;
	const char ret;
} retcode[] = {
	{ "badsys", "bad system parameter", RET_ERR },
	{ "badagent", "useragent has been blocked", RET_ERR },
	{ "badauth", "bad authorization", RET_ERR },
	{ "!donator", "option available only to credited user", RET_ERR },
	{ "good", "update was successful", RET_OK },
	{ "nochg", "no update required", RET_OK },
	{ "notfqdn", "fully-qualified domain name was not provided", RET_ERR },
	{ "nohost", "hostname does not exist in database", RET_ERR },
	{ "!yours", "hostname does not belong to username", RET_ERR },
	{ "abuse", "hostname is blocked for abuse", RET_ERR },
	{ "numhost", "too many or too few hosts found", RET_ERR },
	{ "dnserr", "DNS error encountered", RET_ERR },
	{ "911", "internal server failure", RET_ERR },
	{ NULL,	 NULL, 0 }
};

static int
parse_answer(char *buf, char *name)
{
	char *p;
	int i;

	if (strstr(buf, "HTTP/1.") == NULL)
		errx(1, "strange server response");

	(void) strtok(buf, "\n");
	while ((p = strtok((char *) NULL, "\n")) != NULL) {
		for (i = 0; retcode[i].code != NULL; i++) {
			if (strstr(p, retcode[i].code)) {
				if (verbose)
					warnx("%s: %s", name, retcode[i].message);
				return retcode[i].ret;
			}
		}
	}

	return RET_ERR;
}

int
do_request(int reqc, struct dd_request **reqv)
{
	int i;
	int ret = reqc;
	int sockfd;
	char buf[BUFLEN];

	for (i = 0; i < reqc; i++) {
		sockfd = connecttohost(DYNDNSHOST, DYNDNSPORT);
		build_request(reqv[i], buf);
		if (debug)
			printf("request:\n%s\n", buf);
		if (transfer(sockfd, buf, BUFLEN) == -1)
			err(1, "transfer error");
		close(sockfd);
		if (debug)
			printf("response:\n%s\n", buf);

		if (parse_answer(buf, reqv[i]->name) == RET_OK)
			ret--;
	}

	return ret;
}