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https://gitlab.nic.cz/labs/bird.git
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2d14045224
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.
217 lines
3.3 KiB
C
217 lines
3.3 KiB
C
/*
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* BIRD Internet Routing Daemon -- Unix Entry Point
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*
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* (c) 1998--1999 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/signal.h>
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#include "nest/bird.h"
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#include "lib/lists.h"
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#include "lib/resource.h"
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#include "lib/socket.h"
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#include "lib/event.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "conf/conf.h"
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#include "filter/filter.h"
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#include "unix.h"
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#include "krt.h"
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int shutting_down;
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/*
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* Debugging
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*/
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void
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async_dump(void)
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{
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debug("INTERNAL STATE DUMP\n\n");
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sk_dump_all();
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tm_dump_all();
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if_dump_all();
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neigh_dump_all();
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rta_dump_all();
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rt_dump_all();
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protos_dump_all();
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debug("\n");
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}
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/*
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* Reading the Configuration
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*/
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static int conf_fd;
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static char *config_name = PATH_CONFIG;
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static int
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cf_read(byte *dest, unsigned int len)
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{
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int l = read(conf_fd, dest, len);
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if (l < 0)
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cf_error("Read error");
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return l;
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}
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static void
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read_config(void)
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{
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struct config *conf = config_alloc(config_name);
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conf_fd = open(config_name, O_RDONLY);
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if (conf_fd < 0)
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die("Unable to open configuration file %s: %m", config_name);
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cf_read_hook = cf_read;
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if (!config_parse(conf))
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die("%s, line %d: %s", config_name, conf->err_lino, conf->err_msg);
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config_commit(conf);
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}
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void
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async_config(void)
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{
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debug("Asynchronous reconfigurations are not supported in demo version\n");
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}
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/*
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* Shutdown
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*/
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void
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async_shutdown(void)
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{
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debug("Shutting down...\n");
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shutting_down = 1;
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protos_shutdown();
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}
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void
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protos_shutdown_notify(void)
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{
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die("System shutdown completed");
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}
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/*
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* Signals
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*/
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static void
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handle_sighup(int sig)
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{
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debug("Caught SIGHUP...\n");
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async_config_flag = 1;
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}
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static void
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handle_sigusr(int sig)
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{
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debug("Caught SIGUSR...\n");
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async_dump_flag = 1;
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}
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static void
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handle_sigterm(int sig)
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{
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debug("Caught SIGTERM...\n");
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async_shutdown_flag = 1;
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}
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static void
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signal_init(void)
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{
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struct sigaction sa;
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bzero(&sa, sizeof(sa));
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sa.sa_handler = handle_sigusr;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_handler = handle_sighup;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGHUP, &sa, NULL);
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sa.sa_handler = handle_sigterm;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGTERM, &sa, NULL);
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signal(SIGPIPE, SIG_IGN);
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}
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/*
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* Parsing of command-line arguments
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*/
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static char *opt_list = "c:d:";
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: bird [-c <config-file>] [-d <debug-file>]\n");
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exit(1);
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}
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static void
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parse_args(int argc, char **argv)
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{
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int c;
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while ((c = getopt(argc, argv, opt_list)) >= 0)
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switch (c)
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{
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case 'c':
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config_name = optarg;
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break;
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case 'd':
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log_init_debug(optarg);
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break;
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default:
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usage();
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}
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if (optind < argc)
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usage();
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}
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/*
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* Hic Est main()
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*/
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int
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main(int argc, char **argv)
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{
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log_init_debug(NULL);
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parse_args(argc, argv);
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log(L_INFO "Launching BIRD 0.0.0...");
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debug("Initializing.\n");
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resource_init();
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io_init();
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rt_init();
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if_init();
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protos_build();
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add_tail(&protocol_list, &proto_unix_kernel.n);
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read_config();
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signal_init();
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protos_start();
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ev_run_list(&global_event_list);
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async_dump();
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debug("Entering I/O loop.\n");
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io_loop();
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bug("I/O loop died");
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}
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