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
|
#include "port_before.h"
#include "fd_setsize.h"
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <isc/dst.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "port_after.h"
#define DEBUG
#include "res_debug.h"
/*% res_nsendsigned */
int
res_nsendsigned(res_state statp, const u_char *msg, int msglen,
ns_tsig_key *key, u_char *answer, int anslen)
{
res_state nstatp;
DST_KEY *dstkey;
int usingTCP = 0;
u_char *newmsg;
int newmsglen, bufsize, siglen;
u_char sig[64];
HEADER *hp;
time_t tsig_time;
int ret;
int len;
dst_init();
nstatp = (res_state) malloc(sizeof(*statp));
if (nstatp == NULL) {
errno = ENOMEM;
return (-1);
}
memcpy(nstatp, statp, sizeof(*statp));
bufsize = msglen + 1024;
newmsg = (u_char *) malloc(bufsize);
if (newmsg == NULL) {
free(nstatp);
errno = ENOMEM;
return (-1);
}
memcpy(newmsg, msg, msglen);
newmsglen = msglen;
if (ns_samename(key->alg, NS_TSIG_ALG_HMAC_MD5) != 1)
dstkey = NULL;
else
dstkey = dst_buffer_to_key(key->name, KEY_HMAC_MD5,
NS_KEY_TYPE_AUTH_ONLY,
NS_KEY_PROT_ANY,
key->data, key->len);
if (dstkey == NULL) {
errno = EINVAL;
free(nstatp);
free(newmsg);
return (-1);
}
nstatp->nscount = 1;
siglen = sizeof(sig);
ret = ns_sign(newmsg, &newmsglen, bufsize, NOERROR, dstkey, NULL, 0,
sig, &siglen, 0);
if (ret < 0) {
free (nstatp);
free (newmsg);
dst_free_key(dstkey);
if (ret == NS_TSIG_ERROR_NO_SPACE)
errno = EMSGSIZE;
else if (ret == -1)
errno = EINVAL;
return (ret);
}
if (newmsglen > PACKETSZ || nstatp->options & RES_USEVC)
usingTCP = 1;
if (usingTCP == 0)
nstatp->options |= RES_IGNTC;
else
nstatp->options |= RES_USEVC;
/*
* Stop res_send printing the answer.
*/
nstatp->options &= ~RES_DEBUG;
nstatp->pfcode &= ~RES_PRF_REPLY;
retry:
len = res_nsend(nstatp, newmsg, newmsglen, answer, anslen);
if (len < 0) {
free (nstatp);
free (newmsg);
dst_free_key(dstkey);
return (len);
}
ret = ns_verify(answer, &len, dstkey, sig, siglen,
NULL, NULL, &tsig_time, nstatp->options & RES_KEEPTSIG);
if (ret != 0) {
Dprint((statp->options & RES_DEBUG) ||
((statp->pfcode & RES_PRF_REPLY) &&
(statp->pfcode & RES_PRF_HEAD1)),
(stdout, ";; got answer:\n"));
DprintQ((statp->options & RES_DEBUG) ||
(statp->pfcode & RES_PRF_REPLY),
(stdout, "%s", ""),
answer, (anslen > len) ? len : anslen);
if (ret > 0) {
Dprint(statp->pfcode & RES_PRF_REPLY,
(stdout, ";; server rejected TSIG (%s)\n",
p_rcode(ret)));
} else {
Dprint(statp->pfcode & RES_PRF_REPLY,
(stdout, ";; TSIG invalid (%s)\n",
p_rcode(-ret)));
}
free (nstatp);
free (newmsg);
dst_free_key(dstkey);
if (ret == -1)
errno = EINVAL;
else
errno = ENOTTY;
return (-1);
}
hp = (HEADER *) answer;
if (hp->tc && !usingTCP && (statp->options & RES_IGNTC) == 0U) {
nstatp->options &= ~RES_IGNTC;
usingTCP = 1;
goto retry;
}
Dprint((statp->options & RES_DEBUG) ||
((statp->pfcode & RES_PRF_REPLY) &&
(statp->pfcode & RES_PRF_HEAD1)),
(stdout, ";; got answer:\n"));
DprintQ((statp->options & RES_DEBUG) ||
(statp->pfcode & RES_PRF_REPLY),
(stdout, "%s", ""),
answer, (anslen > len) ? len : anslen);
Dprint(statp->pfcode & RES_PRF_REPLY, (stdout, ";; TSIG ok\n"));
free (nstatp);
free (newmsg);
dst_free_key(dstkey);
return (len);
}
/*! \file */
|
