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/* This file is part of Mailfromd.             -*- c -*-
   Copyright (C) 2006-2011, 2015-2017 Sergey Poznyakoff

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include "srvcfg.h"
#include "global.h"

MF_DEFUN(primitive_hostname, STRING, STRING string)
{
	char *hbuf;
	mf_status stat;

	stat = resolve_ipstr(string, &hbuf);
	MF_ASSERT(stat == mf_success,
		  mf_status_to_exception(stat),
		  _("cannot resolve IP %s"),
		  string);
	
	pushs(env, hbuf);
	free(hbuf);
}
END

MF_DEFUN(primitive_resolve, STRING, STRING string, OPTIONAL, STRING domain)
{
	char *ipstr;
	mf_status stat;
	
	if (MF_OPTVAL(domain,"")[0]) {
		stat = resolve_ipstr_domain(string, domain, &ipstr);
		MF_ASSERT(stat == mf_success,
			  mf_status_to_exception(stat),
			  _("cannot resolve %s.%s"), string, domain);
	} else {
		stat = resolve_hostname(string, &ipstr);
		MF_ASSERT(stat == mf_success,
			  mf_status_to_exception(stat),
			  _("cannot resolve %s"), string);
	}
	pushs(env, ipstr);
	free(ipstr);
}
END

static int
ipaddr_cmp(const void *a, const void *b)
{
	GACOPYZ_UINT32_T ipa = ntohl(**(GACOPYZ_UINT32_T**)a);
	GACOPYZ_UINT32_T ipb = ntohl(**(GACOPYZ_UINT32_T**)b);
	if (ipa < ipb)
		return -1;
	if (ipa > ipb)
		return 1;
	return 0;
}

MF_DEFUN(dns_getaddr, STRING, STRING string)
{
	size_t i;
	unsigned long ttl;
	dns_status dnstat;
	struct dns_reply r;
	
	dnstat = a_lookup(string, &r, &ttl);
	switch (dnstat) {
	case dns_success: {
		MF_OBSTACK_BEGIN();
		qsort(r.base, r.count, sizeof r.base[0], ipaddr_cmp);
		for (i = 0; i < r.count; i++) {
			struct in_addr addr;
			char *q;
			
			addr.s_addr = dns_reply_ip(&r, i);
			q = inet_ntoa(addr);
			if (i > 0)
				MF_OBSTACK_1GROW(' ');
 			MF_OBSTACK_GROW(q);
		}
		dns_reply_free(&r);
		MF_OBSTACK_1GROW(0);
		MF_RETURN_OBSTACK();
	}
	case dns_not_found:
		MF_RETURN("");
	default:
		MF_THROW(mf_status_to_exception(dns_to_mf_status(dnstat)),
			 _("failed to get A record for %s"), string);
	}
}
END

static int
hostname_cmp(const void *a, const void *b)
{
	return strcmp(*(const char**) a, *(const char**) b);
}

MF_DEFUN(dns_getname, STRING, STRING ipstr)
{
	dns_status dnstat;
	struct in_addr addr;
	unsigned long ttl;
	struct dns_reply r;
	
	MF_ASSERT(inet_aton(ipstr, &addr),
		  mfe_invip,
		  _("invalid IP: %s"), ipstr);

	dnstat = ptr_lookup(addr, &r, &ttl);
	switch (dnstat) {
	case dns_success: {
		size_t i;

		qsort(r.base, r.count, sizeof r.base[0], hostname_cmp);

		MF_OBSTACK_BEGIN();
		for (i = 0; i < r.count; i++) {
			if (i > 0)
				MF_OBSTACK_1GROW(' ');
			MF_OBSTACK_GROW((char*)r.base[i]);
		}
		MF_OBSTACK_1GROW(0);

		dns_reply_free(&r);
		MF_RETURN_OBSTACK();
	}
	case dns_not_found:
		MF_RETURN("");
	default:
		MF_THROW(mf_status_to_exception(dns_to_mf_status(dnstat)),
			 _("failed to get PTR record for %s"), ipstr);
	}
}
END

MF_DEFUN(primitive_hasmx, NUMBER, STRING string)
{
	struct mxbuf mxbuf;
	mf_status mxstat;

	mxbuf.mx_flags = 0;
	mxstat = getmx(string, &mxbuf);
	
	MF_ASSERT(mxstat == mf_success || mxstat == mf_not_found,
		  mf_status_to_exception(mxstat),
		  _("cannot get MX records for %s"),
		  string);
	mxbuf_free(&mxbuf);
	if (mxstat == mf_success) {
		MF_RETURN(1);
	}
	MF_RETURN(0);
}
END

MF_DEFUN(getmx, STRING, STRING domain, OPTIONAL, NUMBER no_resolve)
{
	mf_status mxstat;

	if (MF_OPTVAL(no_resolve)) {
		GACOPYZ_UINT32_T *ipbuf;
		size_t ipcount;

		mxstat = getmxip(domain, &ipbuf, &ipcount);
		if (!mf_resolved(mxstat)) {
			MF_THROW(mf_status_to_exception(mxstat),
				 _("cannot get MX records for %s"), domain);
		}
		if (mxstat == mf_not_found) {
			MF_RETURN("");
		} else {
			int i;
			
			MF_OBSTACK_BEGIN();
			for (i = 0; i < ipcount; i++) {
				struct in_addr s;
				s.s_addr = htonl(ipbuf[i]);
				
				if (i > 0)
					MF_OBSTACK_1GROW(' ');
				MF_OBSTACK_GROW(inet_ntoa(s));
			}
			free(ipbuf);
			MF_OBSTACK_1GROW(0);
			MF_RETURN_OBSTACK();
		}
	} else {
		struct mxbuf mxbuf;

		mxstat = getmx(domain, &mxbuf);
		if (!mf_resolved(mxstat)) {
			mxbuf_free(&mxbuf);
			MF_THROW(mf_status_to_exception(mxstat),
				 _("cannot get MX records for %s"), domain);
		}
		if (mxstat == mf_not_found) {
			mxbuf_free(&mxbuf);
			MF_RETURN("");
		} else {
			int i;
		
			MF_OBSTACK_BEGIN();
			for (i = 0; i < mxbuf.mx_cnt; i++) {
				if (i > 0)
					MF_OBSTACK_1GROW(' ');
				MF_OBSTACK_GROW(mxbuf.mx_buf[i]);
			}
			MF_OBSTACK_1GROW(0);
			mxbuf_free(&mxbuf);
			MF_RETURN_OBSTACK();
		}
	}
}
END

static int
resolve_host(const char *string, unsigned long *ip)
{
	int rc;
	struct in_addr addr;
	char *ipstr;

	if (inet_aton(string, &addr)) {
		*ip = addr.s_addr;
		return 0;
	}
	
	if (resolve_hostname(string, &ipstr) != mf_success)
		return 1;

	rc = inet_aton(ipstr, &addr);
	free(ipstr);
	if (rc == 0) {
		mu_error(_("INTERNAL ERROR at %s:%d: resolve_hostname returned "
			   "invalid IP address: %s"),
			 __FILE__, __LINE__, ipstr);
		return 1;
	}
	*ip = addr.s_addr;
	return 0;
}

MF_DEFUN(primitive_ismx, NUMBER, STRING domain, STRING ipstr)
{
	GACOPYZ_UINT32_T *ipbuf;
	size_t ipcount;
	mf_status mxstat;
	unsigned long ip;
	int rc = 0;
	int i;
	
	MF_ASSERT(resolve_host(ipstr, &ip) == 0, mfe_noresolve, 
                  _("cannot resolve host name %s"), ipstr);
	ip = ntohl(ip);

	mxstat = getmxip(domain, &ipbuf, &ipcount);

	if (mxstat != mf_success) {
		MF_THROW(mf_status_to_exception(mxstat),
			 _("cannot get MXs for %s"), domain);
	}

	for (i = 0; i < ipcount; i++) {
		if (ipbuf[i] == ip) {
			rc = 1;
			break;
		}
	}
		
	free(ipbuf);
	MF_RETURN(rc);
}
END

MF_DEFUN(relayed, NUMBER, STRING s)
{
	MF_RETURN(relayed_domain_p(s));
}
END

MF_DEFUN(ptr_validate, NUMBER, STRING s)
{
	int rc, res;
	switch (rc = ptr_validate(s, NULL, NULL, NULL)) {
	case dns_success:
		res = 1;
		break;
	case dns_not_found:
		res = 0;
		break;
	default:
		MF_THROW(mf_status_to_exception(dns_to_mf_status(rc)),
			 _("failed to get PTR record for %s"), s);
	}
	MF_RETURN(res);
}
END

MF_INIT

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