summaryrefslogtreecommitdiff
path: root/bgpd/bgp_main.c
blob: a4cd9ab4890b9ced90bb8cd6ec59e379eeb28f42 (plain)
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
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
/* Main routine of bgpd.
   Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra 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, or (at your option) any
later version.

GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include <zebra.h>

#include "vector.h"
#include "vty.h"
#include "command.h"
#include "getopt.h"
#include "thread.h"
#include <lib/version.h>
#include "memory.h"
#include "prefix.h"
#include "log.h"
#include "privs.h"
#include "sigevent.h"

#include "bgpd/bgpd.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_mplsvpn.h"

/* bgpd options, we use GNU getopt library. */
struct option longopts[] = 
{
  { "daemon",      no_argument,       NULL, 'd'},
  { "config_file", required_argument, NULL, 'f'},
  { "pid_file",    required_argument, NULL, 'i'},
  { "bgp_port",    required_argument, NULL, 'p'},
  { "vty_addr",    required_argument, NULL, 'A'},
  { "vty_port",    required_argument, NULL, 'P'},
  { "retain",      no_argument,       NULL, 'r'},
  { "no_kernel",   no_argument,       NULL, 'n'},
  { "user",        required_argument, NULL, 'u'},
  { "version",     no_argument,       NULL, 'v'},
  { "help",        no_argument,       NULL, 'h'},
  { 0 }
};

/* signal definitions */
void sighup (void);
void sigint (void);
void sigusr1 (void);

struct quagga_signal_t bgp_signals[] = 
{
  { 
    .signal = SIGHUP, 
    .handler = &sighup,
  },
  {
    .signal = SIGUSR1,
    .handler = &sigusr1,
  },
  {
    .signal = SIGINT,
    .handler = &sigint,
  },
  {
    .signal = SIGTERM,
    .handler = &sigint,
  },
};

/* Configuration file and directory. */
char config_default[] = SYSCONFDIR BGP_DEFAULT_CONFIG;

/* Route retain mode flag. */
int retain_mode = 0;

/* Master of threads. */
struct thread_master *master;

/* Manually specified configuration file name.  */
char *config_file = NULL;

/* Process ID saved for use by init system */
char *pid_file = PATH_BGPD_PID;

/* VTY port number and address.  */
int vty_port = BGP_VTY_PORT;
char *vty_addr = NULL;

/* privileges */
zebra_capabilities_t _caps_p [] =  
{
    ZCAP_BIND,
};

struct zebra_privs_t bgpd_privs =
{
#if defined(QUAGGA_USER) && defined(QUAGGA_GROUP)
  .user = QUAGGA_USER,
  .group = QUAGGA_GROUP,
#endif
#ifdef VTY_GROUP
  .vty_group = VTY_GROUP,
#endif
  .caps_p = _caps_p,
  .cap_num_p = sizeof(_caps_p)/sizeof(_caps_p[0]),
  .cap_num_i = 0,
};

/* Help information display. */
static void
usage (char *progname, int status)
{
  if (status != 0)
    fprintf (stderr, "Try `%s --help' for more information.\n", progname);
  else
    {    
      printf ("Usage : %s [OPTION...]\n\n\
Daemon which manages kernel routing table management and \
redistribution between different routing protocols.\n\n\
-d, --daemon       Runs in daemon mode\n\
-f, --config_file  Set configuration file name\n\
-i, --pid_file     Set process identifier file name\n\
-p, --bgp_port     Set bgp protocol's port number\n\
-A, --vty_addr     Set vty's bind address\n\
-P, --vty_port     Set vty's port number\n\
-r, --retain       When program terminates, retain added route by bgpd.\n\
-n, --no_kernel    Do not install route to kernel.\n\
-u, --user         User and group to run as\n\
-v, --version      Print program version\n\
-h, --help         Display this help and exit\n\
\n\
Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
    }

  exit (status);
}

/* SIGHUP handler. */
void 
sighup (void)
{
  zlog (NULL, LOG_INFO, "SIGHUP received");

  /* Terminate all thread. */
  bgp_terminate ();
  bgp_reset ();
  zlog_info ("bgpd restarting!");

  /* Reload config file. */
  vty_read_config (config_file, config_default);

  /* Create VTY's socket */
  vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);

  /* Try to return to normal operation. */
}

/* SIGINT handler. */
void
sigint (void)
{
  zlog (NULL, LOG_INFO, "Terminating on signal");

  if (! retain_mode)
    bgp_terminate ();

  exit (0);
}

/* SIGUSR1 handler. */
void
sigusr1 (void)
{
  zlog_rotate (NULL);
}

/* Main routine of bgpd. Treatment of argument and start bgp finite
   state machine is handled at here. */
int
main (int argc, char **argv)
{
  char *p;
  int opt;
  int daemon_mode = 0;
  char *progname;
  struct thread thread;

  /* Set umask before anything for security */
  umask (0027);

  /* Preserve name of myself. */
  progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);

  zlog_default = openzlog (progname, ZLOG_NOLOG, ZLOG_BGP,
			   LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);

  /* BGP master init. */
  bgp_master_init ();

  /* Command line argument treatment. */
  while (1) 
    {
      opt = getopt_long (argc, argv, "df:i:hp:A:P:rnu:v", longopts, 0);
    
      if (opt == EOF)
	break;

      switch (opt) 
	{
	case 0:
	  break;
	case 'd':
	  daemon_mode = 1;
	  break;
	case 'f':
	  config_file = optarg;
	  break;
        case 'i':
          pid_file = optarg;
          break;
	case 'p':
	  bm->port = atoi (optarg);
	  break;
	case 'A':
	  vty_addr = optarg;
	  break;
	case 'P':
          /* Deal with atoi() returning 0 on failure, and bgpd not
             listening on bgp port... */
          if (strcmp(optarg, "0") == 0) 
            {
              vty_port = 0;
              break;
            } 
          vty_port = atoi (optarg);
          vty_port = (vty_port ? vty_port : BGP_VTY_PORT);
	  break;
	case 'r':
	  retain_mode = 1;
	  break;
	case 'n':
	  bgp_option_set (BGP_OPT_NO_FIB);
	  break;
  case 'u':
    bgpd_privs.user = bgpd_privs.group = optarg;
    break;
	case 'v':
	  print_version (progname);
	  exit (0);
	  break;
	case 'h':
	  usage (progname, 0);
	  break;
	default:
	  usage (progname, 1);
	  break;
	}
    }

  /* Make thread master. */
  master = bm->master;

  /* Initializations. */
  srand (time (NULL));
  signal_init (master, Q_SIGC(bgp_signals), bgp_signals);
  zprivs_init (&bgpd_privs);
  cmd_init (1);
  vty_init (master);
  memory_init ();

  /* BGP related initialization.  */
  bgp_init ();

  /* Sort CLI commands. */
  sort_node ();

  /* Parse config file. */
  vty_read_config (config_file, config_default);

  /* Turn into daemon if daemon_mode is set. */
  if (daemon_mode)
    daemon (0, 0);

  /* Process ID file creation. */
  pid_output (pid_file);

  /* Make bgp vty socket. */
  vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);

  /* Print banner. */
  zlog_info ("BGPd %s starting: vty@%d, bgp@%d", QUAGGA_VERSION,
	     vty_port, bm->port);

  /* Start finite state machine, here we go! */
  while (thread_fetch (master, &thread))
    thread_call (&thread);

  /* Not reached. */
  exit (0);
}