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
|
/* dnsmasq is Copyright (c) 2000-2014 Simon Kelley
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; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
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 "dnsmasq.h"
static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c);
#ifdef HAVE_IPV6
static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c);
#endif
int is_name_synthetic(int flags, char *name, struct all_addr *addr)
{
char *p;
struct cond_domain *c = NULL;
int prot = AF_INET;
#ifdef HAVE_IPV6
if (flags & F_IPV6)
prot = AF_INET6;
#endif
for (c = daemon->synth_domains; c; c = c->next)
{
int found = 0;
char *tail, *pref;
for (tail = name, pref = c->prefix; *tail != 0 && pref && *pref != 0; tail++, pref++)
{
unsigned int c1 = (unsigned char) *pref;
unsigned int c2 = (unsigned char) *tail;
if (c1 >= 'A' && c1 <= 'Z')
c1 += 'a' - 'A';
if (c2 >= 'A' && c2 <= 'Z')
c2 += 'a' - 'A';
if (c1 != c2)
break;
}
if (pref && *pref != 0)
continue; /* prefix match fail */
/* NB, must not alter name if we return zero */
for (p = tail; *p; p++)
{
char c = *p;
if ((c >='0' && c <= '9') || c == '-')
continue;
#ifdef HAVE_IPV6
if (prot == AF_INET6 && ((c >='A' && c <= 'F') || (c >='a' && c <= 'f')))
continue;
#endif
break;
}
if (*p != '.')
continue;
*p = 0;
/* swap . or : for - */
for (p = tail; *p; p++)
if (*p == '-')
{
if (prot == AF_INET)
*p = '.';
#ifdef HAVE_IPV6
else
*p = ':';
#endif
}
if (hostname_isequal(c->domain, p+1) && inet_pton(prot, tail, addr))
{
if (prot == AF_INET)
{
if (!c->is6 &&
ntohl(addr->addr.addr4.s_addr) >= ntohl(c->start.s_addr) &&
ntohl(addr->addr.addr4.s_addr) <= ntohl(c->end.s_addr))
found = 1;
}
#ifdef HAVE_IPV6
else
{
u64 addrpart = addr6part(&addr->addr.addr6);
if (c->is6 &&
is_same_net6(&addr->addr.addr6, &c->start6, 64) &&
addrpart >= addr6part(&c->start6) &&
addrpart <= addr6part(&c->end6))
found = 1;
}
#endif
}
/* restore name */
for (p = tail; *p; p++)
if (*p == '.' || *p == ':')
*p = '-';
*p = '.';
if (found)
return 1;
}
return 0;
}
int is_rev_synth(int flag, struct all_addr *addr, char *name)
{
struct cond_domain *c;
if (flag & F_IPV4 && (c = search_domain(addr->addr.addr4, daemon->synth_domains)))
{
char *p;
*name = 0;
if (c->prefix)
strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
inet_ntop(AF_INET, &addr->addr.addr4, name + strlen(name), ADDRSTRLEN);
for (p = name; *p; p++)
if (*p == '.')
*p = '-';
strncat(name, ".", MAXDNAME);
strncat(name, c->domain, MAXDNAME);
return 1;
}
#ifdef HAVE_IPV6
if (flag & F_IPV6 && (c = search_domain6(&addr->addr.addr6, daemon->synth_domains)))
{
char *p;
*name = 0;
if (c->prefix)
strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
inet_ntop(AF_INET6, &addr->addr.addr6, name + strlen(name), ADDRSTRLEN);
/* IPv6 presentation address can start with ":", but valid domain names
cannot start with "-" so prepend a zero in that case. */
if (!c->prefix && *name == ':')
{
*name = '0';
inet_ntop(AF_INET6, &addr->addr.addr6, name+1, ADDRSTRLEN);
}
for (p = name; *p; p++)
if (*p == ':')
*p = '-';
strncat(name, ".", MAXDNAME);
strncat(name, c->domain, MAXDNAME);
return 1;
}
#endif
return 0;
}
static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c)
{
for (; c; c = c->next)
if (!c->is6 &&
ntohl(addr.s_addr) >= ntohl(c->start.s_addr) &&
ntohl(addr.s_addr) <= ntohl(c->end.s_addr))
return c;
return NULL;
}
char *get_domain(struct in_addr addr)
{
struct cond_domain *c;
if ((c = search_domain(addr, daemon->cond_domain)))
return c->domain;
return daemon->domain_suffix;
}
#ifdef HAVE_IPV6
static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c)
{
u64 addrpart = addr6part(addr);
for (; c; c = c->next)
if (c->is6 &&
is_same_net6(addr, &c->start6, 64) &&
addrpart >= addr6part(&c->start6) &&
addrpart <= addr6part(&c->end6))
return c;
return NULL;
}
char *get_domain6(struct in6_addr *addr)
{
struct cond_domain *c;
if (addr && (c = search_domain6(addr, daemon->cond_domain)))
return c->domain;
return daemon->domain_suffix;
}
#endif
|
