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 #include <sys/resource.h>
53 /** Default CLI pager limit is not configured in startup.conf */
54 #define UNIX_CLI_DEFAULT_PAGER_LIMIT 100000
56 /** Default CLI history depth if not configured in startup.conf */
57 #define UNIX_CLI_DEFAULT_HISTORY 50
59 char *vlib_default_runtime_dir __attribute__ ((weak));
60 char *vlib_default_runtime_dir = "vlib";
62 unix_main_t unix_main;
63 clib_file_main_t file_main;
66 unix_main_init (vlib_main_t * vm)
68 unix_main_t *um = &unix_main;
70 return vlib_call_init_function (vm, unix_input_init);
73 VLIB_INIT_FUNCTION (unix_main_init);
76 unsetup_signal_handlers (int sig)
80 sa.sa_handler = SIG_DFL;
82 sigemptyset (&sa.sa_mask);
83 return sigaction (sig, &sa, 0);
87 /* allocate this buffer from mheap when setting up the signal handler.
88 dangerous to vec_resize it when crashing, mheap itself might have been
90 static u8 *syslog_msg = 0;
91 static int last_signum = 0;
92 static uword last_faulting_address = 0;
95 unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc)
99 /* These come in handy when looking at core files from optimized images */
100 last_signum = signum;
101 last_faulting_address = (uword) si->si_addr;
103 syslog_msg = format (syslog_msg, "received signal %U, PC %U",
104 format_signal, signum, format_ucontext_pc, uc);
106 if (signum == SIGSEGV)
107 syslog_msg = format (syslog_msg, ", faulting address %p", si->si_addr);
111 /* these (caught) signals cause the application to exit */
114 * Ignore SIGTERM if it's sent before we're ready.
116 if (unix_main.vlib_main && unix_main.vlib_main->main_loop_exit_set)
118 syslog (LOG_ERR | LOG_DAEMON, "received SIGTERM, exiting...");
119 unix_main.vlib_main->main_loop_exit_now = 1;
122 syslog (LOG_ERR | LOG_DAEMON, "IGNORE early SIGTERM...");
136 /* by default, print a message and continue */
144 * Test framework sends SIGTERM, so we need to flush the
145 * code coverage stats here.
148 void __gcov_flush (void);
153 /* Null terminate. */
154 vec_add1 (syslog_msg, 0);
158 syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);
160 /* Address of callers: outer first, inner last. */
162 uword n_callers = clib_backtrace (callers, ARRAY_LEN (callers), 0);
164 for (i = 0; i < n_callers; i++)
166 vec_reset_length (syslog_msg);
169 format (syslog_msg, "#%-2d 0x%016lx %U%c", i, callers[i],
170 format_clib_elf_symbol_with_address, callers[i], 0);
172 syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);
175 /* have to remove SIGABRT to avoid recusive - os_exit calling abort() */
176 unsetup_signal_handlers (SIGABRT);
181 clib_warning ("%s", syslog_msg);
185 static clib_error_t *
186 setup_signal_handlers (unix_main_t * um)
191 /* give a big enough buffer for msg, most likely it can avoid vec_resize */
192 vec_alloc (syslog_msg, 2048);
194 for (i = 1; i < 32; i++)
196 clib_memset (&sa, 0, sizeof (sa));
197 sa.sa_sigaction = (void *) unix_signal_handler;
198 sa.sa_flags = SA_SIGINFO;
202 /* these signals take the default action */
209 /* ignore SIGPIPE, SIGCHLD */
212 sa.sa_sigaction = (void *) SIG_IGN;
215 /* catch and handle all other signals */
220 if (sigaction (i, &sa, 0) < 0)
221 return clib_error_return_unix (0, "sigaction %U", format_signal, i);
228 unix_error_handler (void *arg, u8 * msg, int msg_len)
230 unix_main_t *um = arg;
232 /* Echo to stderr when interactive. */
233 if (um->flags & UNIX_FLAG_INTERACTIVE)
235 CLIB_UNUSED (int r) = write (2, msg, msg_len);
239 char save = msg[msg_len - 1];
241 /* Null Terminate. */
242 msg[msg_len - 1] = 0;
244 syslog (LOG_ERR | LOG_DAEMON, "%s", msg);
246 msg[msg_len - 1] = save;
251 vlib_unix_error_report (vlib_main_t * vm, clib_error_t * error)
253 unix_main_t *um = &unix_main;
255 if (um->flags & UNIX_FLAG_INTERACTIVE || error == 0)
264 msg_len = vec_len (msg);
266 /* Null Terminate. */
267 save = msg[msg_len - 1];
268 msg[msg_len - 1] = 0;
270 syslog (LOG_ERR | LOG_DAEMON, "%s", msg);
272 msg[msg_len - 1] = save;
277 startup_config_process (vlib_main_t * vm,
278 vlib_node_runtime_t * rt, vlib_frame_t * f)
280 unix_main_t *um = &unix_main;
284 vlib_process_suspend (vm, 2.0);
286 while (um->unix_config_complete == 0)
287 vlib_process_suspend (vm, 0.1);
289 if (um->startup_config_filename)
291 unformat_input_t sub_input;
294 char *fn = (char *) um->startup_config_filename;
296 fd = open (fn, O_RDONLY);
299 clib_warning ("failed to open `%s'", fn);
303 if (fstat (fd, &s) < 0)
305 clib_warning ("failed to stat `%s'", fn);
311 if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
313 clib_warning ("not a regular file: `%s'", fn);
320 vec_resize (buf, 4096);
321 n = read (fd, buf + l, 4096);
324 _vec_len (buf) = l + n;
331 if (um->log_fd && vec_len (buf))
334 lv = format (lv, "%U: ***** Startup Config *****\n%v",
335 format_timeval, 0 /* current bat-time */ ,
336 0 /* current bat-format */ ,
339 int rv __attribute__ ((unused)) =
340 write (um->log_fd, lv, vec_len (lv));
342 vec_reset_length (lv);
343 lv = format (lv, "%U: ***** End Startup Config *****\n",
344 format_timeval, 0 /* current bat-time */ ,
345 0 /* current bat-format */ );
347 int rv __attribute__ ((unused)) =
348 write (um->log_fd, lv, vec_len (lv));
355 unformat_init_vector (&sub_input, buf);
356 vlib_cli_input (vm, &sub_input, 0, 0);
357 /* frees buf for us */
358 unformat_free (&sub_input);
366 VLIB_REGISTER_NODE (startup_config_node,static) = {
367 .function = startup_config_process,
368 .type = VLIB_NODE_TYPE_PROCESS,
369 .name = "startup-config-process",
373 static clib_error_t *
374 unix_config (vlib_main_t * vm, unformat_input_t * input)
376 unix_main_t *um = &unix_main;
377 clib_error_t *error = 0;
382 um->cli_pager_buffer_limit = UNIX_CLI_DEFAULT_PAGER_LIMIT;
383 um->cli_history_limit = UNIX_CLI_DEFAULT_HISTORY;
385 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
388 if (unformat (input, "interactive"))
389 um->flags |= UNIX_FLAG_INTERACTIVE;
390 else if (unformat (input, "nodaemon"))
391 um->flags |= UNIX_FLAG_NODAEMON;
392 else if (unformat (input, "cli-prompt %s", &cli_prompt))
393 vlib_unix_cli_set_prompt (cli_prompt);
395 if (unformat (input, "cli-listen %s", &um->cli_listen_socket.config))
397 else if (unformat (input, "runtime-dir %s", &um->runtime_dir))
399 else if (unformat (input, "cli-line-mode"))
400 um->cli_line_mode = 1;
401 else if (unformat (input, "cli-no-banner"))
402 um->cli_no_banner = 1;
403 else if (unformat (input, "cli-no-pager"))
404 um->cli_no_pager = 1;
405 else if (unformat (input, "poll-sleep-usec %d", &um->poll_sleep_usec))
407 else if (unformat (input, "cli-pager-buffer-limit %d",
408 &um->cli_pager_buffer_limit))
411 if (unformat (input, "cli-history-limit %d", &um->cli_history_limit))
413 else if (unformat (input, "coredump-size"))
415 uword coredump_size = 0;
416 if (unformat (input, "unlimited"))
418 coredump_size = RLIM_INFINITY;
421 if (!unformat (input, "%U", unformat_memory_size, &coredump_size))
423 return clib_error_return (0,
424 "invalid coredump-size parameter `%U'",
425 format_unformat_error, input);
427 const struct rlimit new_limit = { coredump_size, coredump_size };
428 if (0 != setrlimit (RLIMIT_CORE, &new_limit))
430 clib_unix_warning ("prlimit() failed");
433 else if (unformat (input, "full-coredump"))
437 fd = open ("/proc/self/coredump_filter", O_WRONLY);
440 if (write (fd, "0x6f\n", 5) != 5)
441 clib_unix_warning ("coredump filter write failed!");
445 clib_unix_warning ("couldn't open /proc/self/coredump_filter");
447 else if (unformat (input, "startup-config %s",
448 &um->startup_config_filename))
450 else if (unformat (input, "exec %s", &um->startup_config_filename))
452 else if (unformat (input, "log %s", &um->log_filename))
454 um->log_fd = open ((char *) um->log_filename,
455 O_CREAT | O_WRONLY | O_APPEND, 0644);
458 clib_warning ("couldn't open log '%s'\n", um->log_filename);
464 lv = format (0, "%U: ***** Start: PID %d *****\n",
465 format_timeval, 0 /* current bat-time */ ,
466 0 /* current bat-format */ ,
469 int rv __attribute__ ((unused)) =
470 write (um->log_fd, lv, vec_len (lv));
475 else if (unformat (input, "gid %U", unformat_unix_gid, &gid))
477 if (setegid (gid) == -1)
478 return clib_error_return_unix (0, "setegid");
480 else if (unformat (input, "pidfile %s", &um->pidfile))
483 return clib_error_return (0, "unknown input `%U'",
484 format_unformat_error, input);
487 if (um->runtime_dir == 0)
489 uid_t uid = geteuid ();
491 um->runtime_dir = format (0, "/run/%s%c",
492 vlib_default_runtime_dir, 0);
494 um->runtime_dir = format (0, "/run/user/%u/%s%c", uid,
495 vlib_default_runtime_dir, 0);
498 error = setup_signal_handlers (um);
504 if ((error = vlib_unix_validate_runtime_file (um,
505 (char *) um->pidfile,
509 if (((pidfd = open ((char *) um->pidfile,
510 O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0))
512 return clib_error_return_unix (0, "open");
516 if (!(um->flags & UNIX_FLAG_INTERACTIVE))
518 openlog (vm->name, LOG_CONS | LOG_PERROR | LOG_PID, LOG_DAEMON);
519 clib_error_register_handler (unix_error_handler, um);
521 if (!(um->flags & UNIX_FLAG_NODAEMON) && daemon ( /* chdir to / */ 0,
522 /* stdin/stdout/stderr -> /dev/null */
524 clib_error_return (0, "daemon () fails");
529 u8 *lv = format (0, "%d", getpid ());
530 if (write (pidfd, (char *) lv, vec_len (lv)) != vec_len (lv))
534 return clib_error_return_unix (0, "write");
540 um->unix_config_complete = 1;
545 /* unix { ... } configuration. */
548 * @cfgcmd{interactive}
549 * Attach CLI to stdin/out and provide a debugging command line interface.
550 * Implies @c nodaemon.
553 * Do not fork or background the VPP process. Typically used when invoking
554 * VPP applications from a process monitor.
556 * @cfgcmd{exec, <filename>}
557 * @par <code>startup-config <filename></code>
558 * Read startup operational configuration from @c filename.
559 * The contents of the file will be performed as though entered at the CLI.
560 * The two keywords are aliases for the same function; if both are specified,
561 * only the last will have an effect.
563 * @cfgcmd{log, <filename>}
564 * Logs the startup configuration and all subsequent CLI commands in
566 * Very useful in situations where folks don't remember or can't be bothered
567 * to include CLI commands in bug reports.
569 * @cfgcmd{pidfile, <filename>}
570 * Writes the pid of the main thread in @c filename.
572 * @cfgcmd{full-coredump}
573 * Ask the Linux kernel to dump all memory-mapped address regions, instead
574 * of just text+data+bss.
576 * @cfgcmd{runtime-dir}
577 * Define directory where VPP is going to store all runtime files.
578 * Default is /run/vpp when running as root, /run/user/<UID>/vpp if running as
579 * an unprivileged user.
581 * @cfgcmd{cli-listen, <address:port>}
582 * Bind the CLI to listen at the address and port given. @c localhost
583 * on TCP port @c 5002, given as <tt>cli-listen localhost:5002</tt>,
586 * @cfgcmd{cli-line-mode}
587 * Disable character-by-character I/O on stdin. Useful when combined with,
588 * for example, <tt>emacs M-x gud-gdb</tt>.
590 * @cfgcmd{cli-prompt, <string>}
591 * Configure the CLI prompt to be @c string.
593 * @cfgcmd{cli-history-limit, <nn>}
594 * Limit command history to @c nn lines. A value of @c 0
595 * disables command history. Default value: @c 50
597 * @cfgcmd{cli-no-banner}
598 * Disable the login banner on stdin and Telnet connections.
600 * @cfgcmd{cli-no-pager}
601 * Disable the output pager.
603 * @cfgcmd{cli-pager-buffer-limit, <nn>}
604 * Limit pager buffer to @c nn lines of output.
605 * A value of @c 0 disables the pager. Default value: @c 100000
607 * @cfgcmd{gid, <nn>}
608 * Set the effective gid under which the vpp process is to run.
610 * @cfgcmd{poll-sleep-usec, <nn>}
611 * Set a fixed poll sleep interval between main loop polls.
613 VLIB_EARLY_CONFIG_FUNCTION (unix_config, "unix");
615 static clib_error_t *
616 unix_exit (vlib_main_t * vm)
618 /* Close syslog connection. */
623 VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_exit);
625 u8 **vlib_thread_stacks;
630 vlib_main_t *vm = (vlib_main_t *) arg;
631 unformat_input_t input;
634 unformat_init_command_line (&input, (char **) vm->argv);
635 i = vlib_main (vm, &input);
636 unformat_free (&input);
642 vlib_thread_stack_init (uword thread_index)
644 vec_validate (vlib_thread_stacks, thread_index);
645 vlib_thread_stacks[thread_index] = clib_mem_alloc_aligned
646 (VLIB_THREAD_STACK_SIZE, clib_mem_get_page_size ());
649 * Disallow writes to the bottom page of the stack, to
650 * catch stack overflows.
652 if (mprotect (vlib_thread_stacks[thread_index],
653 clib_mem_get_page_size (), PROT_READ) < 0)
654 clib_unix_warning ("thread stack");
655 return vlib_thread_stacks[thread_index];
659 vlib_unix_main (int argc, char *argv[])
661 vlib_main_t *vm = &vlib_global_main; /* one and only time for this! */
662 unformat_input_t input;
666 vm->argv = (u8 **) argv;
668 vm->heap_base = clib_mem_get_heap ();
669 vm->heap_aligned_base = (void *)
670 (((uword) vm->heap_base) & ~(VLIB_FRAME_ALIGN - 1));
671 ASSERT (vm->heap_base);
673 unformat_init_command_line (&input, (char **) vm->argv);
674 if ((e = vlib_plugin_config (vm, &input)))
676 clib_error_report (e);
679 unformat_free (&input);
681 i = vlib_plugin_early_init (vm);
685 unformat_init_command_line (&input, (char **) vm->argv);
686 if (vm->init_functions_called == 0)
687 vm->init_functions_called = hash_create (0, /* value bytes */ 0);
688 e = vlib_call_all_config_functions (vm, &input, 1 /* early */ );
691 clib_error_report (e);
694 unformat_free (&input);
696 /* always load symbols, for signal handler and mheap memory get/put backtrace */
697 clib_elf_main_init (vm->name);
699 vlib_thread_stack_init (0);
701 __os_thread_index = 0;
702 vm->thread_index = 0;
704 i = clib_calljmp (thread0, (uword) vm,
705 (void *) (vlib_thread_stacks[0] +
706 VLIB_THREAD_STACK_SIZE));
711 * fd.io coding-style-patch-verification: ON
714 * eval: (c-set-style "gnu")