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
|
/*
* Copyright: 2005 Axis Communications AB
*
* This file is part of Mini DHCP6.
*
* mdhcp6 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 2 of the License, or
* (at your option) any later version.
*
* mdhcp6 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 mdhcp6. If not, see <http://www.gnu.org/licenses/>.
*
* dhcpv6 lease handling.
*
* Authors: Edgar E. Iglesias <[email protected]>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "msgbuf.h"
#include "dhcpv6.h"
#include "optionmap.h"
#include "lease.h"
#undef D
#define D(x)
static inline FILE *lease_open_file(char *filename) {
FILE *fp;
if (!filename)
return NULL;
if ((fp = fopen(filename, "rb+")) == NULL) {
if ((fp = fopen(filename, "wb+")) == NULL) {
perror(filename);
return NULL;
}
}
return fp;
}
void lease_set_server(struct lease_t *lz,
struct dhcpv6_nodeid_t *server) {
dhcpv6_free_nodeid(lz->server);
lz->server = server;
}
void lease_set_ia(struct lease_t *lz,
struct dhcpv6_option_ia_t *ia) {
dhcpv6_free_ia(lz->ia);
lz->ia = ia;
}
/* returns non-zero if any options where dropped. This is useful for the caller
to know if it needs to let notify config changes. */
int lease_drop(struct lease_t *lease) {
int r = 0;
char *p;
char *end;
lease_set_ia(lease, NULL);
lease_set_server(lease, NULL);
/* Clear and count addr. */
p = (char *) &lease->addr;
end = p + sizeof lease->addr;
while (p < end) {
if (*p)
r = 1;
*p = 0;
p++;
}
r |= optionmap_drop(lease->omap,
sizeof lease->omap
/ sizeof lease->omap[0]);
lease->aquired = 0;
memset(&lease->addr, 0, sizeof lease->addr);
return r;
}
void lease_cleanup(struct lease_t *lease) {
lease_set_ia(lease, NULL);
lease_set_server(lease, NULL);
memset(&lease->addr, 0, sizeof lease->addr);
memset(&lease->oldaddr, 0, sizeof lease->oldaddr);
optionmap_cleanup(lease->omap,
sizeof lease->omap
/ sizeof lease->omap[0]);
}
/*
* read lease info from file
*/
void lease_readfile(char *filename, struct lease_t *lease) {
char addrstr[INET6_ADDRSTRLEN];
size_t r;
FILE *fp;
assert(lease);
if ((fp = lease_open_file(filename)) == NULL)
return;
/* sync from file */
if (fgets(addrstr, sizeof addrstr, fp)) {
unsigned char duidbuf[128];
size_t len = strlen(addrstr);
addrstr[len - 1] = 0; /* chop the newline */
r = inet_pton(AF_INET6, addrstr, &lease->addr);
if (r != -1) {
inet_ntop(AF_INET6, &lease->addr,
addrstr, INET6_ADDRSTRLEN);
D(printf("synccore %s\n", addrstr));
}
r = fread(duidbuf, 1, sizeof duidbuf, fp);
if (r > 0)
lease->server = dhcpv6_parse_nodeid(duidbuf, r);
lease->needsreconfig = 1;
}
memcpy(&lease->syncedaddr, &lease->addr, sizeof lease->addr);
fclose(fp);
}
/*
* synchronize the current lease with the one on the leasefile
*/
void lease_sync(char *filename, struct lease_t *lease) {
char addrstr[INET6_ADDRSTRLEN];
int insync;
FILE *fp;
if (!lease->ia || !lease->server)
return;
insync = !memcmp(&lease->syncedaddr, &lease->addr, sizeof lease->addr);
inet_ntop(AF_INET6, &lease->addr,
addrstr, INET6_ADDRSTRLEN);
if (!insync) {
struct msgbuf_t *msg;
if ((fp = lease_open_file(filename)) == NULL) {
D(printf("%s: no leasefile\n", __func__));
return;
}
/* update file */
D(printf("syncfile - %s\n", addrstr));
rewind(fp);
fprintf(fp, "%s\n", addrstr);
msg = msgbuf_new(lease->server->duidlen);
dhcpv6_append_node_id_opt(&msg, DH6OPT_SERVERID,
lease->server);
fwrite(msg->buf + 4, 1, msg->pos - 4, fp);
msgbuf_free(msg);
fflush(fp);
lease->needsreconfig = 1;
/* synced */
memcpy(&lease->syncedaddr, &lease->addr, sizeof lease->addr);
fclose(fp);
}
}
int lease_test_and_clear_reconfig(struct lease_t *lease) {
int needsreconfig = lease->needsreconfig;
lease->needsreconfig = 0;
needsreconfig |=optionmap_test_and_clear_reconfig(lease->omap,
sizeof lease->omap /
sizeof *lease->omap);
return needsreconfig;
}
void lease_update_oldvalues(struct lease_t *lease) {
if (lease->aquired)
memcpy(&lease->oldaddr, &lease->addr, sizeof lease->addr);
else
memset(&lease->oldaddr, 0, sizeof lease->oldaddr);
memset(&lease->addr, 0, sizeof lease->addr);
optionmap_update_oldvalues(lease->omap,
sizeof lease->omap
/ sizeof lease->omap[0]);
}
/*
* fabricate an environment for the configuration scripts process.
* Tipically called from a separate process.
*/
#undef ADDRENVNAME
#define ADDRENVNAME "dh6_addr="
#undef OLDADDRENVNAME
#define OLDADDRENVNAME "dh6_addr_old="
void lease_create_environ(struct lease_t *lease) {
/*
* this mess makes it possible for the compiler to optimze the strlen..
*/
static char addrstr[INET6_ADDRSTRLEN + 20] = ADDRENVNAME;
static char oldaddrstr[INET6_ADDRSTRLEN + 20] = OLDADDRENVNAME;
char *str = addrstr + strlen(ADDRENVNAME);
char *oldstr = oldaddrstr + strlen(OLDADDRENVNAME);
assert((strlen(OLDADDRENVNAME) + INET6_ADDRSTRLEN + 1)
< sizeof(oldaddrstr));
assert((strlen(ADDRENVNAME) + INET6_ADDRSTRLEN+1) < sizeof(addrstr));
inet_ntop(AF_INET6, &lease->addr, str, INET6_ADDRSTRLEN);
inet_ntop(AF_INET6, &lease->oldaddr, oldstr, INET6_ADDRSTRLEN);
D(printf("%s str=%s oldstr=%s ia=%x server=%x\n",
__func__, str, oldstr, lease->ia, lease->server));
if (lease->ia
&& lease->server
&& (memcmp(&in6addr_any, &lease->addr, sizeof lease->addr) != 0))
putenv(addrstr);
if (memcmp(&in6addr_any, &lease->oldaddr, sizeof lease->addr) != 0)
putenv(oldaddrstr);
{
static char raflags[32];
static char state[32];
snprintf(raflags, sizeof raflags,
"dh6_raflags=%x", lease->raflags);
putenv(raflags);
snprintf(state, sizeof state,
"dh6_state=%x", lease->state);
putenv(state);
}
optionmap_create_environ(lease->omap,
sizeof lease->omap
/ sizeof lease->omap[0]);
}
|
