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/*
* 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>
#undef 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 "lib/timer.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;
bird_clock_t boot_time;
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);
c->load_time = now;
if (!boot_time)
boot_time = now;
return c;
}
int
config_parse(struct config *c)
{
DBG("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();
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 void
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;
}
}
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;
}
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