2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * main.c: Unix main routine
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
39 #include <vlib/vlib.h>
40 #include <vlib/unix/unix.h>
41 #include <vlib/unix/plugin.h>
44 #include <sys/ucontext.h>
46 #include <sys/types.h>
50 unix_main_t unix_main;
53 unix_main_init (vlib_main_t * vm)
55 unix_main_t * um = &unix_main;
57 return vlib_call_init_function (vm, unix_input_init);
60 VLIB_INIT_FUNCTION (unix_main_init);
62 static void unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc)
67 msg = format (msg, "received signal %U, PC %U",
68 format_signal, signum,
69 format_ucontext_pc, uc);
71 if (signum == SIGSEGV)
72 msg = format (msg, ", faulting address %p", si->si_addr);
76 /* these (caught) signals cause the application to exit */
78 if (unix_main.vlib_main->main_loop_exit_set)
80 syslog (LOG_ERR | LOG_DAEMON, "received SIGTERM, exiting...");
82 clib_longjmp (&unix_main.vlib_main->main_loop_exit,
83 VLIB_MAIN_LOOP_EXIT_CLI);
95 /* by default, print a message and continue */
101 /* Null terminate. */
106 syslog (LOG_ERR | LOG_DAEMON, "%s", msg);
110 clib_warning ("%s", msg);
115 static clib_error_t *
116 setup_signal_handlers (unix_main_t * um)
121 for (i = 1; i < 32; i++)
123 memset (&sa, 0, sizeof (sa));
124 sa.sa_sigaction = (void *) unix_signal_handler;
125 sa.sa_flags = SA_SIGINFO;
129 /* these signals take the default action */
137 /* ignore SIGPIPE, SIGCHLD */
140 sa.sa_sigaction = (void *) SIG_IGN;
143 /* catch and handle all other signals */
148 if (sigaction (i, &sa, 0) < 0)
149 return clib_error_return_unix (0, "sigaction %U", format_signal, i);
155 static void unix_error_handler (void * arg, u8 * msg, int msg_len)
157 unix_main_t * um = arg;
159 /* Echo to stderr when interactive. */
160 if (um->flags & UNIX_FLAG_INTERACTIVE)
162 CLIB_UNUSED (int r) = write (2, msg, msg_len);
166 char save = msg[msg_len - 1];
168 /* Null Terminate. */
171 syslog (LOG_ERR | LOG_DAEMON, "%s", msg);
173 msg[msg_len-1] = save;
177 void vlib_unix_error_report (vlib_main_t * vm, clib_error_t * error)
179 unix_main_t * um = &unix_main;
181 if (um->flags & UNIX_FLAG_INTERACTIVE || error == 0)
190 msg_len = vec_len(msg);
192 /* Null Terminate. */
193 save = msg[msg_len-1];
196 syslog (LOG_ERR | LOG_DAEMON, "%s", msg);
198 msg[msg_len-1] = save;
203 startup_config_process (vlib_main_t * vm,
204 vlib_node_runtime_t * rt,
207 unix_main_t * um = &unix_main;
211 vlib_process_suspend (vm, 2.0);
213 while (um->unix_config_complete == 0)
214 vlib_process_suspend (vm, 0.1);
216 if (um->startup_config_filename) {
217 unformat_input_t sub_input;
220 char *fn = (char *)um->startup_config_filename;
222 fd = open (fn, O_RDONLY);
224 clib_warning ("failed to open `%s'", fn);
228 if (fstat (fd, &s) < 0) {
229 clib_warning ("failed to stat `%s'", fn);
235 if (! (S_ISREG (s.st_mode) || S_ISLNK (s.st_mode))) {
236 clib_warning ("not a regular file: `%s'", fn);
243 vec_resize (buf, 4096);
244 n = read (fd, buf + l, 4096);
247 _vec_len (buf) = l + n;
254 if (um->log_fd && vec_len (buf))
257 lv = format (lv, "%U: ***** Startup Config *****\n%v",
259 0 /* current bat-time */,
260 0 /* current bat-format */,
263 int rv __attribute__((unused)) =
264 write (um->log_fd, lv, vec_len(lv));
266 vec_reset_length (lv);
267 lv = format (lv, "%U: ***** End Startup Config *****\n",
269 0 /* current bat-time */,
270 0 /* current bat-format */);
272 int rv __attribute__((unused)) =
273 write (um->log_fd, lv, vec_len(lv));
280 unformat_init_vector (&sub_input, buf);
281 vlib_cli_input (vm, &sub_input, 0, 0);
282 /* frees buf for us */
283 unformat_free (&sub_input);
290 VLIB_REGISTER_NODE (startup_config_node,static) = {
291 .function = startup_config_process,
292 .type = VLIB_NODE_TYPE_PROCESS,
293 .name = "startup-config-process",
296 static clib_error_t *
297 unix_config (vlib_main_t * vm, unformat_input_t * input)
299 unix_main_t * um = &unix_main;
300 clib_error_t * error = 0;
302 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
305 if (unformat (input, "interactive"))
306 um->flags |= UNIX_FLAG_INTERACTIVE;
307 else if (unformat (input, "nodaemon"))
308 um->flags |= UNIX_FLAG_NODAEMON;
309 else if (unformat (input, "cli-prompt %s", &cli_prompt))
310 vlib_unix_cli_set_prompt (cli_prompt);
311 else if (unformat (input, "cli-listen %s", &um->cli_listen_socket.config))
313 else if (unformat (input, "cli-line-mode"))
314 um->cli_line_mode = 1;
315 else if (unformat (input, "cli-no-banner"))
316 um->cli_no_banner = 1;
317 else if (unformat (input, "cli-history-limit %d", &um->cli_history_limit))
319 else if (unformat (input, "full-coredump"))
323 fd = open ("/proc/self/coredump_filter", O_WRONLY);
326 if (write (fd, "0x6f\n", 5) != 5)
327 clib_unix_warning ("coredump filter write failed!");
331 clib_unix_warning ("couldn't open /proc/self/coredump_filter");
333 else if (unformat (input, "startup-config %s",
334 &um->startup_config_filename))
336 else if (unformat (input, "exec %s",
337 &um->startup_config_filename))
339 else if (unformat (input, "log %s", &um->log_filename))
341 um->log_fd = open ((char *) um->log_filename,
342 O_CREAT | O_WRONLY | O_APPEND, 0644);
345 clib_warning ("couldn't open log '%s'\n", um->log_filename);
351 lv = format (0, "%U: ***** Start: PID %d *****\n",
353 0 /* current bat-time */,
354 0 /* current bat-format */,
357 int rv __attribute__((unused)) =
358 write (um->log_fd, lv, vec_len(lv));
364 return clib_error_return (0, "unknown input `%U'",
365 format_unformat_error, input);
368 if (! (um->flags & UNIX_FLAG_INTERACTIVE))
370 error = setup_signal_handlers (um);
374 openlog (vm->name, LOG_CONS | LOG_PERROR | LOG_PID, LOG_DAEMON);
375 clib_error_register_handler (unix_error_handler, um);
377 if (! (um->flags & UNIX_FLAG_NODAEMON)
378 && daemon (/* chdir to / */ 0,
379 /* stdin/stdout/stderr -> /dev/null */ 0) < 0)
380 clib_error_return (0, "daemon () fails");
382 um->unix_config_complete = 1;
387 /* unix { ... } configuration. */
388 VLIB_CONFIG_FUNCTION (unix_config, "unix");
390 static clib_error_t *
391 unix_exit (vlib_main_t * vm)
393 /* Close syslog connection. */
398 VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_exit);
400 u8 **vlib_thread_stacks;
402 static uword thread0 (uword arg)
404 vlib_main_t * vm = (vlib_main_t *)arg;
405 unformat_input_t input;
408 unformat_init_command_line (&input, (char **)vm->argv);
409 i = vlib_main (vm, &input);
410 unformat_free (&input);
415 int vlib_unix_main (int argc, char * argv[])
417 vlib_main_t * vm = &vlib_global_main; /* one and only time for this! */
419 clib_smp_main_t * sm = &clib_smp_main;
420 vlib_thread_main_t * tm = &vlib_thread_main;
421 unformat_input_t input;
426 vm->argv = (u8 **)argv;
428 vm->heap_base = clib_mem_get_heap ();
429 ASSERT(vm->heap_base);
431 i = vlib_plugin_early_init (vm);
435 unformat_init_command_line (&input, (char **)vm->argv);
436 if (vm->init_functions_called == 0)
437 vm->init_functions_called = hash_create (0, /* value bytes */ 0);
438 e = vlib_call_all_config_functions (vm, &input, 1 /* early */);
441 clib_error_report(e);
444 unformat_free (&input);
446 /* allocate N x 1mb stacks, aligned e.g. to a 16mb boundary */
447 thread_stacks = clib_mem_alloc_aligned
448 (tm->n_thread_stacks * VLIB_THREAD_STACK_SIZE,
449 (VLIB_MAX_CPUS << VLIB_LOG2_THREAD_STACK_SIZE));
451 sm->vm_base = thread_stacks;
452 sm->log2_n_per_cpu_vm_bytes = VLIB_LOG2_THREAD_STACK_SIZE;
454 vec_validate (vlib_thread_stacks, tm->n_thread_stacks - 1);
455 for (i = 0; i < vec_len (vlib_thread_stacks); i++)
457 vlib_thread_stacks[i] = thread_stacks;
460 * Disallow writes to the bottom page of the stack, to
461 * catch stack overflows.
463 if (mprotect (thread_stacks, clib_mem_get_page_size(), PROT_READ) < 0)
464 clib_unix_warning ("thread stack");
466 thread_stacks += VLIB_THREAD_STACK_SIZE;
469 i = clib_calljmp (thread0, (uword) vm,
470 (void *)(vlib_thread_stacks[0] + VLIB_THREAD_STACK_SIZE));