summaryrefslogtreecommitdiffabout
path: root/src/builtin/dns.bi
blob: 3f68f459957c7541dc1e78985b318936dc0d92a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/* This file is part of Mailfromd.             -*- c -*-
   Copyright (C) 2006-2019 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/>. */

MF_BUILTIN_MODULE

#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;
	dns_status dnstat;
	struct dns_reply r;
	
	dnstat = a_lookup(string, &r);
	switch (dnstat) {
	case dns_success: {
		MF_OBSTACK_BEGIN();
		qsort(r.data.ip, r.count, sizeof r.data.ip[0], ipaddr_cmp);
		for (i = 0; i < r.count; i++) {
			struct in_addr addr;
			char *q;
			
			addr.s_addr = r.data.ip[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;
	struct dns_reply r;
	
	MF_ASSERT(inet_aton(ipstr, &addr),
		  mfe_invip,
		  _("invalid IP: %s"), ipstr);

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

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

		MF_OBSTACK_BEGIN();
		for (i = 0; i < r.count; i++) {
			if (i > 0)
				MF_OBSTACK_1GROW(' ');
			MF_OBSTACK_GROW((char*)r.data.str[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 dns_reply repl;
	mf_status mxstat;

	mxstat = dns_to_mf_status(mx_lookup(string, 0, &repl));
	
	MF_ASSERT(mxstat == mf_success || mxstat == mf_not_found,
		  mf_status_to_exception(mxstat),
		  _("cannot get MX records for %s"),
		  string);
	dns_reply_free(&repl);
	if (mxstat == mf_success) {
		MF_RETURN(1);
	}
	MF_RETURN(0);
}
END

MF_DEFUN(getmx, STRING, STRING domain, OPTIONAL, NUMBER resolve)
{
	mf_status mxstat;
	struct dns_reply reply;
	int i;
	
	mxstat = dns_to_mf_status(mx_lookup(domain, MF_OPTVAL(resolve),
					    &reply));
	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 if (reply.type == dns_reply_ip) {
		MF_OBSTACK_BEGIN();
		for (i = 0; i < reply.count; i++) {
			struct in_addr s;
			s.s_addr = reply.data.ip[i];
			if (i > 0)
				MF_OBSTACK_1GROW(' ');
			MF_OBSTACK_GROW(inet_ntoa(s));
		}
	} else {
		MF_OBSTACK_BEGIN();
		for (i = 0; i < reply.count; i++) {
			if (i > 0)
				MF_OBSTACK_1GROW(' ');
			MF_OBSTACK_GROW(reply.data.str[i]);
		}
	}
	MF_OBSTACK_1GROW(0);
	dns_reply_free(&reply);
	MF_RETURN_OBSTACK();
}
END

static dns_status
resolve_host(const char *string, struct dns_reply *reply)
{
	struct in_addr addr;

	if (inet_aton(string, &addr)) {
		dns_reply_init(reply, dns_reply_ip, 1);
		reply->data.ip[0] = addr.s_addr;
		return dns_success;
	}
	return a_lookup(string, reply);
}

static int
dns_replies_intersect(struct dns_reply const *a, struct dns_reply const *b)
{
	int i, j;
	
	if (a->type == b->type && a->type == dns_reply_ip) {
		for (i = 0; i < a->count; i++) 
			for (j = 0; j < b->count; j++) 
				if (a->data.ip[i] == b->data.ip[j])
					return 1;
	}
	return 0;
}

MF_DEFUN(primitive_ismx, NUMBER, STRING domain, STRING ipstr)
{
	struct dns_reply areply, mxreply;
	dns_status status;
	int rc = 0;

	status = resolve_host(ipstr, &areply);
	MF_ASSERT(status == dns_success,
		  mf_status_to_exception(dns_to_mf_status(status)), 
                  _("cannot resolve host name %s"), ipstr);
	status = mx_lookup(domain, 1, &mxreply);
	if (status != dns_success) {
		dns_reply_free(&areply);
		MF_THROW(mf_status_to_exception(dns_to_mf_status(status)),
			 _("cannot get MXs for %s"), domain);
	}
	rc = dns_replies_intersect(&areply, &mxreply);
	dns_reply_free(&areply);
	dns_reply_free(&mxreply);
	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)) {
	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

Return to:

Send suggestions and report system problems to the System administrator.