bird/sysdep/unix/main.c
Martin Mares 2d14045224 Rewrote the kernel syncer. The old layering was horrible.
The new kernel syncer is cleanly split between generic UNIX module
and OS dependent submodules:

  -  krt.c (the generic part)
  -  krt-iface (low-level functions for interface handling)
  -  krt-scan (low-level functions for routing table scanning)
  -  krt-set (low-level functions for setting of kernel routes)

krt-set and krt-iface are common for all BSD-like Unices, krt-scan is heavily
system dependent (most Unices require /dev/kmem parsing, Linux uses /proc),
Netlink substitues all three modules.

We expect each UNIX port supports kernel routing table scanning, kernel
interface table scanning, kernel route manipulation and possibly also
asynchronous event notifications (new route, interface state change;
not implemented yet) and build the KRT protocol on the top of these
primitive operations.
1999-03-03 19:49:56 +00:00

216 lines
3.3 KiB
C

/*
* BIRD Internet Routing Daemon -- Unix Entry Point
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/signal.h>
#include "nest/bird.h"
#include "lib/lists.h"
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/event.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "conf/conf.h"
#include "filter/filter.h"
#include "unix.h"
#include "krt.h"
int shutting_down;
/*
* Debugging
*/
void
async_dump(void)
{
debug("INTERNAL STATE DUMP\n\n");
sk_dump_all();
tm_dump_all();
if_dump_all();
neigh_dump_all();
rta_dump_all();
rt_dump_all();
protos_dump_all();
debug("\n");
}
/*
* Reading the Configuration
*/
static int conf_fd;
static char *config_name = PATH_CONFIG;
static int
cf_read(byte *dest, unsigned int len)
{
int l = read(conf_fd, dest, len);
if (l < 0)
cf_error("Read error");
return l;
}
static void
read_config(void)
{
struct config *conf = config_alloc(config_name);
conf_fd = open(config_name, O_RDONLY);
if (conf_fd < 0)
die("Unable to open configuration file %s: %m", config_name);
cf_read_hook = cf_read;
if (!config_parse(conf))
die("%s, line %d: %s", config_name, conf->err_lino, conf->err_msg);
config_commit(conf);
}
void
async_config(void)
{
debug("Asynchronous reconfigurations are not supported in demo version\n");
}
/*
* Shutdown
*/
void
async_shutdown(void)
{
debug("Shutting down...\n");
shutting_down = 1;
protos_shutdown();
}
void
protos_shutdown_notify(void)
{
die("System shutdown completed");
}
/*
* Signals
*/
static void
handle_sighup(int sig)
{
debug("Caught SIGHUP...\n");
async_config_flag = 1;
}
static void
handle_sigusr(int sig)
{
debug("Caught SIGUSR...\n");
async_dump_flag = 1;
}
static void
handle_sigterm(int sig)
{
debug("Caught SIGTERM...\n");
async_shutdown_flag = 1;
}
static void
signal_init(void)
{
struct sigaction sa;
bzero(&sa, sizeof(sa));
sa.sa_handler = handle_sigusr;
sa.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &sa, NULL);
sa.sa_handler = handle_sighup;
sa.sa_flags = SA_RESTART;
sigaction(SIGHUP, &sa, NULL);
sa.sa_handler = handle_sigterm;
sa.sa_flags = SA_RESTART;
sigaction(SIGTERM, &sa, NULL);
signal(SIGPIPE, SIG_IGN);
}
/*
* Parsing of command-line arguments
*/
static char *opt_list = "c:d:";
static void
usage(void)
{
fprintf(stderr, "Usage: bird [-c <config-file>] [-d <debug-file>]\n");
exit(1);
}
static void
parse_args(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, opt_list)) >= 0)
switch (c)
{
case 'c':
config_name = optarg;
break;
case 'd':
log_init_debug(optarg);
break;
default:
usage();
}
if (optind < argc)
usage();
}
/*
* Hic Est main()
*/
int
main(int argc, char **argv)
{
log_init_debug(NULL);
parse_args(argc, argv);
log(L_INFO "Launching BIRD 0.0.0...");
debug("Initializing.\n");
resource_init();
io_init();
rt_init();
if_init();
protos_build();
add_tail(&protocol_list, &proto_unix_kernel.n);
read_config();
signal_init();
protos_start();
ev_run_list(&global_event_list);
async_dump();
debug("Entering I/O loop.\n");
io_loop();
bug("I/O loop died");
}