vtysh_main.c
上传用户:xiaozhuqw
上传日期:2009-11-15
资源大小:1338k
文件大小:6k
- /* Virtual terminal interface shell.
- * Copyright (C) 2000 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 <sys/un.h>
- #include <setjmp.h>
- #include <sys/wait.h>
- #include <pwd.h>
- #include <readline/readline.h>
- #include <readline/history.h>
- #include "version.h"
- #include "getopt.h"
- #include "command.h"
- #include "vtysh/vtysh.h"
- #include "vtysh/vtysh_user.h"
- /* VTY shell program name. */
- char *progname;
- /* Configuration file name. Usually this is configurable, but vtysh
- has static configuration file only. */
- char *config_file = NULL;
- /* Configuration file and directory. */
- char *config_current = NULL;
- char config_default[] = SYSCONFDIR VTYSH_DEFAULT_CONFIG;
- /* Integrated configuration file. */
- char *integrate_file = NULL;
- char *integrate_current = NULL;
- #if 0
- char integrate_default[] = SYSCONFDIR INTEGRATE_DEFAULT_CONFIG;
- #endif
- /* Flag for indicate executing child command. */
- int execute_flag = 0;
- /* For sigsetjmp() & siglongjmp(). */
- static sigjmp_buf jmpbuf;
- /* Flag for avoid recursive siglongjmp() call. */
- static int jmpflag = 0;
- /* A static variable for holding the line. */
- static char *line_read;
- /* Master of threads. */
- struct thread_master *master;
- /* SIGTSTP handler. This function care user's ^Z input. */
- void
- sigtstp (int sig)
- {
- /* Execute "end" command. */
- vtysh_execute ("end");
-
- /* Initialize readline. */
- rl_initialize ();
- printf ("n");
- /* Check jmpflag for duplicate siglongjmp(). */
- if (! jmpflag)
- return;
- jmpflag = 0;
- /* Back to main command loop. */
- siglongjmp (jmpbuf, 1);
- }
- /* SIGINT handler. This function care user's ^Z input. */
- void
- sigint (int sig)
- {
- /* Check this process is not child process. */
- if (! execute_flag)
- {
- rl_initialize ();
- printf ("n");
- rl_forced_update_display ();
- }
- }
- /* Signale wrapper. */
- RETSIGTYPE *
- signal_set (int signo, void (*func)(int))
- {
- int ret;
- struct sigaction sig;
- struct sigaction osig;
- sig.sa_handler = func;
- sigemptyset (&sig.sa_mask);
- sig.sa_flags = 0;
- #ifdef SA_RESTART
- sig.sa_flags |= SA_RESTART;
- #endif /* SA_RESTART */
- ret = sigaction (signo, &sig, &osig);
- if (ret < 0)
- return (SIG_ERR);
- else
- return (osig.sa_handler);
- }
- /* Initialization of signal handles. */
- void
- signal_init ()
- {
- signal_set (SIGINT, sigint);
- signal_set (SIGTSTP, sigtstp);
- signal_set (SIGPIPE, SIG_IGN);
- }
- /* Help information display. */
- static void
- usage (int status)
- {
- if (status != 0)
- fprintf (stderr, "Try `%s --help' for more information.n", progname);
- else
- {
- printf ("Usage : %s [OPTION...]nn
- Daemon which manages kernel routing table management and
- redistribution between different routing protocols.nn
- -b, --boot Execute boot startup configurationn
- -e, --eval Execute argument as commandn
- -h, --help Display this help and exitn
- n
- Report bugs to %sn", progname, ZEBRA_BUG_ADDRESS);
- }
- exit (status);
- }
- /* VTY shell options, we use GNU getopt library. */
- struct option longopts[] =
- {
- { "boot", no_argument, NULL, 'b'},
- { "eval", required_argument, NULL, 'e'},
- { "help", no_argument, NULL, 'h'},
- { 0 }
- };
- /* Read a string, and return a pointer to it. Returns NULL on EOF. */
- char *
- vtysh_rl_gets ()
- {
- /* If the buffer has already been allocated, return the memory
- to the free pool. */
- if (line_read)
- {
- free (line_read);
- line_read = NULL;
- }
-
- /* Get a line from the user. Change prompt according to node. XXX. */
- line_read = readline (vtysh_prompt ());
-
- /* If the line has any text in it, save it on the history. */
- if (line_read && *line_read)
- add_history (line_read);
-
- return (line_read);
- }
- /* VTY shell main routine. */
- int
- main (int argc, char **argv, char **env)
- {
- char *p;
- int opt;
- int eval_flag = 0;
- int boot_flag = 0;
- char *eval_line = NULL;
- char *integrated_file = NULL;
- /* Preserve name of myself. */
- progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
- /* Option handling. */
- while (1)
- {
- opt = getopt_long (argc, argv, "be:h", longopts, 0);
-
- if (opt == EOF)
- break;
- switch (opt)
- {
- case 0:
- break;
- case 'b':
- boot_flag = 1;
- break;
- case 'e':
- eval_flag = 1;
- eval_line = optarg;
- break;
- case 'h':
- usage (0);
- break;
- case 'i':
- integrated_file = strdup (optarg);
- default:
- usage (1);
- break;
- }
- }
- /* Initialize user input buffer. */
- line_read = NULL;
- /* Signal and others. */
- signal_init ();
- /* Make vty structure and register commands. */
- vtysh_init_vty ();
- vtysh_init_cmd ();
- vtysh_user_init ();
- vtysh_config_init ();
- vty_init_vtysh ();
- sort_node ();
- vtysh_connect_all ();
- /* Read vtysh configuration file. */
- vtysh_read_config (config_file, config_current, config_default);
- /* If eval mode */
- if (eval_flag)
- {
- vtysh_execute_no_pager (eval_line);
- exit (0);
- }
-
- /* Boot startup configuration file. */
- if (boot_flag)
- {
- vtysh_read_config (integrate_file, integrate_current, integrate_default);
- exit (0);
- }
- vtysh_pager_init ();
- vtysh_readline_init ();
- vty_hello (vty);
- vtysh_auth ();
- /* Preparation for longjmp() in sigtstp(). */
- sigsetjmp (jmpbuf, 1);
- jmpflag = 1;
- /* Main command loop. */
- while (vtysh_rl_gets ())
- vtysh_execute (line_read);
- printf ("n");
- /* Rest in peace. */
- exit (0);
- }