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
|
/*
* BIRD Internet Routing Daemon -- Configuration File Handling
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <setjmp.h>
#include <stdarg.h>
#define LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "lib/event.h"
#include "conf/conf.h"
#include "filter/filter.h"
static jmp_buf conf_jmpbuf;
struct config *config, *new_config, *old_config, *future_config;
static event *config_event;
int shutting_down;
struct config *
config_alloc(byte *name)
{
pool *p = rp_new(&root_pool, "Config");
linpool *l = lp_new(p, 4080);
struct config *c = lp_allocz(l, sizeof(struct config));
c->pool = p;
cfg_mem = c->mem = l;
c->file_name = cfg_strdup(name);
return c;
}
int
config_parse(struct config *c)
{
debug("Parsing configuration file `%s'\n", c->file_name);
new_config = c;
cfg_mem = c->mem;
if (setjmp(conf_jmpbuf))
return 0;
cf_lex_init(0);
sysdep_preconfig(c);
protos_preconfig(c);
rt_preconfig(c);
cf_parse();
filters_postconfig(); /* FIXME: Do we really need this? */
protos_postconfig(c);
#ifdef IPV6
if (!c->router_id)
cf_error("Router ID must be configured manually on IPv6 routers");
#endif
return 1;
}
int
cli_parse(struct config *c)
{
new_config = c;
c->sym_fallback = config->sym_hash;
cfg_mem = c->mem;
if (setjmp(conf_jmpbuf))
return 0;
cf_lex_init(1);
cf_parse();
return 1;
}
void
config_free(struct config *c)
{
rfree(c->pool);
}
void
config_add_obstacle(struct config *c)
{
DBG("+++ adding obstacle %d\n", c->obstacle_count);
c->obstacle_count++;
}
void
config_del_obstacle(struct config *c)
{
DBG("+++ deleting obstacle %d\n", c->obstacle_count);
c->obstacle_count--;
if (!c->obstacle_count)
{
ASSERT(config_event);
ev_schedule(config_event);
}
}
static int
global_commit(struct config *new, struct config *old)
{
if (!old)
return 0;
if (!new->router_id)
new->router_id = old->router_id;
if (new->router_id != old->router_id)
return 1;
return 0;
}
static int
config_do_commit(struct config *c)
{
int force_restart, nobs;
DBG("do_commit\n");
old_config = config;
config = new_config = c;
if (old_config)
old_config->obstacle_count++;
DBG("sysdep_commit\n");
force_restart = sysdep_commit(c, old_config);
DBG("global_commit\n");
force_restart |= global_commit(c, old_config);
DBG("rt_commit\n");
rt_commit(c, old_config);
DBG("protos_commit\n");
protos_commit(c, old_config, force_restart);
new_config = NULL; /* Just to be sure nobody uses that now */
if (old_config)
nobs = --old_config->obstacle_count;
else
nobs = 0;
DBG("do_commit finished with %d obstacles remaining\n", nobs);
return !nobs;
}
static int
config_done(void *unused)
{
struct config *c;
DBG("config_done\n");
for(;;)
{
if (config->shutdown)
sysdep_shutdown_done();
log(L_INFO "Reconfigured");
if (old_config)
{
config_free(old_config);
old_config = NULL;
}
if (!future_config)
break;
c = future_config;
future_config = NULL;
log(L_INFO "Switching to queued configuration...");
if (!config_do_commit(c))
break;
}
return 0;
}
int
config_commit(struct config *c)
{
if (!config) /* First-time configuration */
{
config_do_commit(c);
return CONF_DONE;
}
if (old_config) /* Reconfiguration already in progress */
{
if (shutting_down)
{
log(L_INFO "New configuration discarded due to shutdown");
config_free(c);
return CONF_SHUTDOWN;
}
if (future_config)
{
log(L_INFO "Queueing new configuration, ignoring the one already queued");
config_free(future_config);
}
else
log(L_INFO "Queued new configuration");
future_config = c;
return CONF_QUEUED;
}
if (config_do_commit(c))
{
config_done(NULL);
return CONF_DONE;
}
if (!config_event)
{
config_event = ev_new(&root_pool);
config_event->hook = config_done;
}
return CONF_PROGRESS;
}
void
order_shutdown(void)
{
struct config *c;
if (shutting_down)
return;
log(L_INFO "Shutting down");
c = lp_alloc(config->mem, sizeof(struct config));
memcpy(c, config, sizeof(struct config));
init_list(&c->protos);
init_list(&c->tables);
c->shutdown = 1;
config_commit(c);
shutting_down = 1;
}
void
cf_error(char *msg, ...)
{
char buf[1024];
va_list args;
va_start(args, msg);
if (bvsnprintf(buf, sizeof(buf), msg, args) < 0)
strcpy(buf, "<bug: error message too long>");
new_config->err_msg = cfg_strdup(buf);
new_config->err_lino = conf_lino;
longjmp(conf_jmpbuf, 1);
}
char *
cfg_strdup(char *c)
{
int l = strlen(c) + 1;
char *z = cfg_allocu(l);
memcpy(z, c, l);
return z;
}
|
