vtysh/vtysh_main.c

   1 /* Virtual terminal interface shell.
   2  * Copyright (C) 2000 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include <sys/un.h>
  24 #include <setjmp.h>
  25 #include <sys/wait.h>
  26 #include <pwd.h>
  27 #include <sys/file.h>
  28 #include <unistd.h>
  29
  30 /* readline carries some ancient definitions around */
  31 #pragma GCC diagnostic push
  32 #pragma GCC diagnostic ignored "-Wstrict-prototypes"
  33 #include <readline/readline.h>
  34 #include <readline/history.h>
  35 #pragma GCC diagnostic pop
  36
  37 /*
  38  * The append_history function only appears in newer versions
  39  * of the readline library it appears like.  Since we don't
  40  * need this just silently ignore the code on these
  41  * ancient platforms.
  42  */
  43 #if !defined HAVE_APPEND_HISTORY
  44 #define append_history(A, B)
  45 #endif
  46
  47 #include <lib/version.h>
  48 #include "getopt.h"
  49 #include "command.h"
  50 #include "memory.h"
  51 #include "linklist.h"
  52 #include "libfrr.h"
  53 #include "ferr.h"
  54 #include "lib_errors.h"
  55
  56 #include "vtysh/vtysh.h"
  57 #include "vtysh/vtysh_user.h"
  58
  59 /* VTY shell program name. */
  60 char *progname;
  61
  62 /* SUID mode */
  63 static uid_t elevuid, realuid;
  64 static gid_t elevgid, realgid;
  65
  66 #define VTYSH_CONFIG_NAME "vtysh.conf"
  67 #define FRR_CONFIG_NAME "frr.conf"
  68
  69 /* Configuration file name and directory. */
  70 static char vtysh_config[MAXPATHLEN * 3];
  71 char frr_config[MAXPATHLEN * 3];
  72 char vtydir[MAXPATHLEN];
  73 static char history_file[MAXPATHLEN];
  74
  75 /* Flag for indicate executing child command. */
  76 int execute_flag = 0;
  77
  78 /* Flag to indicate if in user/unprivileged mode. */
  79 int user_mode;
  80
  81 /* Master of threads. */
  82 struct thread_master *master;
  83
  84 /* Command logging */
  85 FILE *logfile;
  86
  87 static void vtysh_rl_callback(char *line_read)
  88 {
  89         HIST_ENTRY *last;
  90
  91         rl_callback_handler_remove();
  92
  93         if (!line_read) {
  94                 vtysh_loop_exited = true;
  95                 return;
  96         }
  97
  98         /* If the line has any text in it, save it on the history. But only if
  99          * last command in history isn't the same one.
 100          */
 101         if (*line_read) {
 102                 using_history();
 103                 last = previous_history();
 104                 if (!last || strcmp(last->line, line_read) != 0) {
 105                         add_history(line_read);
 106                         append_history(1, history_file);
 107                 }
 108         }
 109
 110         vtysh_execute(line_read);
 111
 112         if (!vtysh_loop_exited)
 113                 rl_callback_handler_install(vtysh_prompt(), vtysh_rl_callback);
 114 }
 115
 116 /* SIGTSTP handler.  This function care user's ^Z input. */
 117 static void sigtstp(int sig)
 118 {
 119         rl_callback_handler_remove();
 120
 121         /* Execute "end" command. */
 122         vtysh_execute("end");
 123
 124         if (!vtysh_loop_exited)
 125                 rl_callback_handler_install(vtysh_prompt(), vtysh_rl_callback);
 126
 127         /* Initialize readline. */
 128         rl_initialize();
 129         printf("\n");
 130         rl_forced_update_display();
 131 }
 132
 133 /* SIGINT handler.  This function care user's ^Z input.  */
 134 static void sigint(int sig)
 135 {
 136         /* Check this process is not child process. */
 137         if (!execute_flag) {
 138                 rl_initialize();
 139                 printf("\n");
 140                 rl_forced_update_display();
 141         }
 142 }
 143
 144 /* Signale wrapper for vtysh. We don't use sigevent because
 145  * vtysh doesn't use threads. TODO */
 146 static void vtysh_signal_set(int signo, void (*func)(int))
 147 {
 148         struct sigaction sig;
 149         struct sigaction osig;
 150
 151         sig.sa_handler = func;
 152         sigemptyset(&sig.sa_mask);
 153         sig.sa_flags = 0;
 154 #ifdef SA_RESTART
 155         sig.sa_flags |= SA_RESTART;
 156 #endif /* SA_RESTART */
 157
 158         sigaction(signo, &sig, &osig);
 159 }
 160
 161 /* Initialization of signal handles. */
 162 static void vtysh_signal_init(void)
 163 {
 164         vtysh_signal_set(SIGINT, sigint);
 165         vtysh_signal_set(SIGTSTP, sigtstp);
 166         vtysh_signal_set(SIGPIPE, SIG_IGN);
 167 }
 168
 169 /* Help information display. */
 170 static void usage(int status)
 171 {
 172         if (status != 0)
 173                 fprintf(stderr, "Try `%s --help' for more information.\n",
 174                         progname);
 175         else
 176                 printf("Usage : %s [OPTION...]\n\n"
 177                        "Integrated shell for FRR (version " FRR_VERSION
 178                        "). \n"
 179                        "Configured with:\n    " FRR_CONFIG_ARGS
 180                        "\n\n"
 181                        "-b, --boot               Execute boot startup configuration\n"
 182                        "-c, --command            Execute argument as command\n"
 183                        "-d, --daemon             Connect only to the specified daemon\n"
 184                        "-f, --inputfile          Execute commands from specific file and exit\n"
 185                        "-E, --echo               Echo prompt and command in -c mode\n"
 186                        "-C, --dryrun             Check configuration for validity and exit\n"
 187                        "-m, --markfile           Mark input file with context end\n"
 188                        "    --vty_socket         Override vty socket path\n"
 189                        "    --config_dir         Override config directory path\n"
 190                        "-N  --pathspace          Insert prefix into config & socket paths\n"
 191                        "-u  --user               Run as an unprivileged user\n"
 192                        "-w, --writeconfig        Write integrated config (frr.conf) and exit\n"
 193                        "-H, --histfile           Override history file\n"
 194                        "-h, --help               Display this help and exit\n\n"
 195                        "Note that multiple commands may be executed from the command\n"
 196                        "line by passing multiple -c args, or by embedding linefeed\n"
 197                        "characters in one or more of the commands.\n\n"
 198                        "Report bugs to %s\n",
 199                        progname, FRR_BUG_ADDRESS);
 200
 201         exit(status);
 202 }
 203
 204 /* VTY shell options, we use GNU getopt library. */
 205 #define OPTION_VTYSOCK 1000
 206 #define OPTION_CONFDIR 1001
 207 struct option longopts[] = {
 208         {"boot", no_argument, NULL, 'b'},
 209         /* For compatibility with older zebra/quagga versions */
 210         {"eval", required_argument, NULL, 'e'},
 211         {"command", required_argument, NULL, 'c'},
 212         {"daemon", required_argument, NULL, 'd'},
 213         {"vty_socket", required_argument, NULL, OPTION_VTYSOCK},
 214         {"config_dir", required_argument, NULL, OPTION_CONFDIR},
 215         {"inputfile", required_argument, NULL, 'f'},
 216         {"histfile", required_argument, NULL, 'H'},
 217         {"echo", no_argument, NULL, 'E'},
 218         {"dryrun", no_argument, NULL, 'C'},
 219         {"help", no_argument, NULL, 'h'},
 220         {"noerror", no_argument, NULL, 'n'},
 221         {"mark", no_argument, NULL, 'm'},
 222         {"writeconfig", no_argument, NULL, 'w'},
 223         {"pathspace", required_argument, NULL, 'N'},
 224         {"user", no_argument, NULL, 'u'},
 225         {"timestamp", no_argument, NULL, 't'},
 226         {0}};
 227
 228 bool vtysh_loop_exited;
 229
 230 static struct thread *vtysh_rl_read_thread;
 231
 232 static void vtysh_rl_read(struct thread *thread)
 233 {
 234         thread_add_read(master, vtysh_rl_read, NULL, STDIN_FILENO,
 235                         &vtysh_rl_read_thread);
 236         rl_callback_read_char();
 237 }
 238
 239 /* Read a string, and return a pointer to it.  Returns NULL on EOF. */
 240 static void vtysh_rl_run(void)
 241 {
 242         struct thread thread;
 243
 244         master = thread_master_create(NULL);
 245
 246         rl_callback_handler_install(vtysh_prompt(), vtysh_rl_callback);
 247         thread_add_read(master, vtysh_rl_read, NULL, STDIN_FILENO,
 248                         &vtysh_rl_read_thread);
 249
 250         while (!vtysh_loop_exited && thread_fetch(master, &thread))
 251                 thread_call(&thread);
 252
 253         if (!vtysh_loop_exited)
 254                 rl_callback_handler_remove();
 255
 256         thread_master_free(master);
 257 }
 258
 259 static void log_it(const char *line)
 260 {
 261         time_t t = time(NULL);
 262         struct tm tmp;
 263         const char *user = getenv("USER");
 264         char tod[64];
 265
 266         localtime_r(&t, &tmp);
 267         if (!user)
 268                 user = "boot";
 269
 270         strftime(tod, sizeof(tod), "%Y%m%d-%H:%M.%S", &tmp);
 271
 272         fprintf(logfile, "%s:%s %s\n", tod, user, line);
 273 }
 274
 275 static int flock_fd;
 276
 277 static void vtysh_flock_config(const char *flock_file)
 278 {
 279         int count = 0;
 280
 281         flock_fd = open(flock_file, O_RDONLY, 0644);
 282         if (flock_fd < 0) {
 283                 fprintf(stderr, "Unable to create lock file: %s, %s\n",
 284                         flock_file, safe_strerror(errno));
 285                 return;
 286         }
 287
 288         while (count < 400 && (flock(flock_fd, LOCK_EX | LOCK_NB) < 0)) {
 289                 count++;
 290                 usleep(500000);
 291         }
 292
 293         if (count >= 400)
 294                 fprintf(stderr,
 295                         "Flock of %s failed, continuing this may cause issues\n",
 296                         flock_file);
 297 }
 298
 299 static void vtysh_unflock_config(void)
 300 {
 301         flock(flock_fd, LOCK_UN);
 302         close(flock_fd);
 303 }
 304
 305 void suid_on(void)
 306 {
 307         if (elevuid != realuid && seteuid(elevuid)) {
 308                 perror("seteuid(on)");
 309                 exit(1);
 310         }
 311         if (elevgid != realgid && setegid(elevgid)) {
 312                 perror("setegid(on)");
 313                 exit(1);
 314         }
 315 }
 316
 317 void suid_off(void)
 318 {
 319         if (elevuid != realuid && seteuid(realuid)) {
 320                 perror("seteuid(off)");
 321                 exit(1);
 322         }
 323         if (elevgid != realgid && setegid(realgid)) {
 324                 perror("setegid(off)");
 325                 exit(1);
 326         }
 327 }
 328
 329 /* VTY shell main routine. */
 330 int main(int argc, char **argv, char **env)
 331 {
 332         char *p;
 333         int opt;
 334         int dryrun = 0;
 335         int boot_flag = 0;
 336         bool ts_flag = false;
 337         const char *daemon_name = NULL;
 338         const char *inputfile = NULL;
 339         struct cmd_rec {
 340                 char *line;
 341                 struct cmd_rec *next;
 342         } *cmd = NULL;
 343         struct cmd_rec *tail = NULL;
 344         int echo_command = 0;
 345         int no_error = 0;
 346         int markfile = 0;
 347         int writeconfig = 0;
 348         int ret = 0;
 349         char *homedir = NULL;
 350         int ditch_suid = 0;
 351         char sysconfdir[MAXPATHLEN];
 352         const char *pathspace_arg = NULL;
 353         char pathspace[MAXPATHLEN] = "";
 354         const char *histfile = NULL;
 355
 356         /* SUID: drop down to calling user & go back up when needed */
 357         elevuid = geteuid();
 358         elevgid = getegid();
 359         realuid = getuid();
 360         realgid = getgid();
 361         suid_off();
 362
 363         user_mode = 0;          /* may be set in options processing */
 364
 365         /* Preserve name of myself. */
 366         progname = ((p = strrchr(argv[0], '/')) ? ++p : argv[0]);
 367
 368         strlcpy(sysconfdir, frr_sysconfdir, sizeof(sysconfdir));
 369
 370         frr_init_vtydir();
 371         strlcpy(vtydir, frr_vtydir, sizeof(vtydir));
 372
 373         /* Option handling. */
 374         while (1) {
 375                 opt = getopt_long(argc, argv, "be:c:d:nf:H:mEhCwN:ut", longopts,
 376                                   0);
 377
 378                 if (opt == EOF)
 379                         break;
 380
 381                 switch (opt) {
 382                 case 0:
 383                         break;
 384                 case 'b':
 385                         boot_flag = 1;
 386                         break;
 387                 case 'e':
 388                 case 'c': {
 389                         struct cmd_rec *cr;
 390                         cr = XMALLOC(MTYPE_TMP, sizeof(*cr));
 391                         cr->line = optarg;
 392                         cr->next = NULL;
 393                         if (tail)
 394                                 tail->next = cr;
 395                         else
 396                                 cmd = cr;
 397                         tail = cr;
 398                 } break;
 399                 case OPTION_VTYSOCK:
 400                         ditch_suid = 1; /* option disables SUID */
 401                         strlcpy(vtydir, optarg, sizeof(vtydir));
 402                         break;
 403                 case OPTION_CONFDIR:
 404                         ditch_suid = 1; /* option disables SUID */
 405                         snprintf(sysconfdir, sizeof(sysconfdir), "%s/", optarg);
 406                         break;
 407                 case 'N':
 408                         if (strchr(optarg, '/') || strchr(optarg, '.')) {
 409                                 fprintf(stderr,
 410                                         "slashes or dots are not permitted in the --pathspace option.\n");
 411                                 exit(1);
 412                         }
 413                         pathspace_arg = optarg;
 414                         snprintf(pathspace, sizeof(pathspace), "%s/", optarg);
 415                         break;
 416                 case 'd':
 417                         daemon_name = optarg;
 418                         break;
 419                 case 'f':
 420                         inputfile = optarg;
 421                         break;
 422                 case 'm':
 423                         markfile = 1;
 424                         break;
 425                 case 'n':
 426                         no_error = 1;
 427                         break;
 428                 case 'E':
 429                         echo_command = 1;
 430                         break;
 431                 case 'C':
 432                         dryrun = 1;
 433                         break;
 434                 case 'u':
 435                         user_mode = 1;
 436                         break;
 437                 case 't':
 438                         ts_flag = true;
 439                         break;
 440                 case 'w':
 441                         writeconfig = 1;
 442                         break;
 443                 case 'h':
 444                         usage(0);
 445                         break;
 446                 case 'H':
 447                         histfile = optarg;
 448                         break;
 449                 default:
 450                         usage(1);
 451                         break;
 452                 }
 453         }
 454
 455         if (ditch_suid) {
 456                 elevuid = realuid;
 457                 elevgid = realgid;
 458         }
 459
 460         if (markfile + writeconfig + dryrun + boot_flag > 1) {
 461                 fprintf(stderr,
 462                         "Invalid combination of arguments.  Please specify at most one of:\n\t-b, -C, -m, -w\n");
 463                 return 1;
 464         }
 465         if (inputfile && (writeconfig || boot_flag)) {
 466                 fprintf(stderr,
 467                         "WARNING: Combinining the -f option with -b or -w is NOT SUPPORTED since its\nresults are inconsistent!\n");
 468         }
 469
 470         snprintf(vtysh_config, sizeof(vtysh_config), "%s%s%s", sysconfdir,
 471                  pathspace, VTYSH_CONFIG_NAME);
 472         snprintf(frr_config, sizeof(frr_config), "%s%s%s", sysconfdir,
 473                  pathspace, FRR_CONFIG_NAME);
 474
 475         if (pathspace_arg) {
 476                 strlcat(vtydir, "/", sizeof(vtydir));
 477                 strlcat(vtydir, pathspace_arg, sizeof(vtydir));
 478         }
 479
 480         /* Initialize user input buffer. */
 481         setlinebuf(stdout);
 482
 483         /* Signal and others. */
 484         vtysh_signal_init();
 485
 486         /* Make vty structure and register commands. */
 487         vtysh_init_vty();
 488         vtysh_init_cmd();
 489         vtysh_user_init();
 490         vtysh_config_init();
 491
 492         vty_init_vtysh();
 493
 494         if (!user_mode) {
 495                 /* Read vtysh configuration file before connecting to daemons.
 496                  * (file may not be readable to calling user in SUID mode) */
 497                 suid_on();
 498                 vtysh_read_config(vtysh_config, dryrun);
 499                 suid_off();
 500         }
 501         /* Error code library system */
 502         log_ref_init();
 503         lib_error_init();
 504
 505         if (markfile) {
 506                 if (!inputfile) {
 507                         fprintf(stderr,
 508                                 "-f option MUST be specified with -m option\n");
 509                         return 1;
 510                 }
 511                 return (vtysh_mark_file(inputfile));
 512         }
 513
 514         /* Start execution only if not in dry-run mode */
 515         if (dryrun && !cmd) {
 516                 if (inputfile) {
 517                         ret = vtysh_read_config(inputfile, dryrun);
 518                 } else {
 519                         ret = vtysh_read_config(frr_config, dryrun);
 520                 }
 521
 522                 exit(ret);
 523         }
 524
 525         if (dryrun && cmd && cmd->line) {
 526                 if (!user_mode)
 527                         vtysh_execute("enable");
 528                 while (cmd) {
 529                         struct cmd_rec *cr;
 530                         char *cmdnow = cmd->line, *next;
 531                         do {
 532                                 next = strchr(cmdnow, '\n');
 533                                 if (next)
 534                                         *next++ = '\0';
 535
 536                                 if (echo_command)
 537                                         printf("%s%s\n", vtysh_prompt(),
 538                                                cmdnow);
 539
 540                                 ret = vtysh_execute_no_pager(cmdnow);
 541                                 if (!no_error
 542                                     && !(ret == CMD_SUCCESS
 543                                          || ret == CMD_SUCCESS_DAEMON
 544                                          || ret == CMD_WARNING))
 545                                         exit(1);
 546                         } while ((cmdnow = next) != NULL);
 547
 548                         cr = cmd;
 549                         cmd = cmd->next;
 550                         XFREE(MTYPE_TMP, cr);
 551                 }
 552                 exit(ret);
 553         }
 554
 555         /* Ignore error messages */
 556         if (no_error) {
 557                 if (freopen("/dev/null", "w", stdout) == NULL) {
 558                         fprintf(stderr,
 559                                 "Exiting: Failed to duplicate stdout with -n option");
 560                         exit(1);
 561                 }
 562         }
 563
 564         /* SUID: go back up elevated privs */
 565         suid_on();
 566
 567         /* Make sure we pass authentication before proceeding. */
 568         vtysh_auth();
 569
 570         /* Do not connect until we have passed authentication. */
 571         if (vtysh_connect_all(daemon_name) <= 0) {
 572                 fprintf(stderr, "Exiting: failed to connect to any daemons.\n");
 573                 if (geteuid() != 0)
 574                         fprintf(stderr,
 575                                 "Hint: if this seems wrong, try running me as a privileged user!\n");
 576                 if (no_error)
 577                         exit(0);
 578                 else
 579                         exit(1);
 580         }
 581
 582         /* SUID: back down, don't need privs further on */
 583         suid_off();
 584
 585         if (writeconfig) {
 586                 if (user_mode) {
 587                         fprintf(stderr,
 588                                 "writeconfig cannot be used when running as an unprivileged user.\n");
 589                         if (no_error)
 590                                 exit(0);
 591                         else
 592                                 exit(1);
 593                 }
 594                 vtysh_execute("enable");
 595                 return vtysh_write_config_integrated();
 596         }
 597
 598         if (inputfile) {
 599                 vtysh_flock_config(inputfile);
 600                 ret = vtysh_read_config(inputfile, dryrun);
 601                 vtysh_unflock_config();
 602                 exit(ret);
 603         }
 604
 605         /*
 606          * Setup history file for use by both -c and regular input
 607          * If we can't find the home directory, then don't store
 608          * the history information.
 609          * VTYSH_HISTFILE is preferred over command line
 610          * argument (-H/--histfile).
 611          */
 612         if (getenv("VTYSH_HISTFILE")) {
 613                 const char *file = getenv("VTYSH_HISTFILE");
 614
 615                 strlcpy(history_file, file, sizeof(history_file));
 616         } else if (histfile) {
 617                 strlcpy(history_file, histfile, sizeof(history_file));
 618         } else {
 619                 homedir = vtysh_get_home();
 620                 if (homedir)
 621                         snprintf(history_file, sizeof(history_file),
 622                                  "%s/.history_frr", homedir);
 623         }
 624
 625         if (strlen(history_file) > 0) {
 626                 if (read_history(history_file) != 0) {
 627                         int fp;
 628
 629                         fp = open(history_file, O_CREAT | O_EXCL,
 630                                   S_IRUSR | S_IWUSR);
 631                         if (fp != -1)
 632                                 close(fp);
 633
 634                         read_history(history_file);
 635                 }
 636         }
 637
 638         if (getenv("VTYSH_LOG")) {
 639                 const char *logpath = getenv("VTYSH_LOG");
 640
 641                 logfile = fopen(logpath, "a");
 642                 if (!logfile) {
 643                         fprintf(stderr, "Failed to open logfile (%s): %s\n",
 644                                 logpath, strerror(errno));
 645                         exit(1);
 646                 }
 647         }
 648
 649         /* If eval mode. */
 650         if (cmd && cmd->line) {
 651                 /* Enter into enable node. */
 652                 if (!user_mode)
 653                         vtysh_execute("enable");
 654
 655                 vtysh_add_timestamp = ts_flag;
 656
 657                 while (cmd != NULL) {
 658                         char *eol;
 659
 660                         while ((eol = strchr(cmd->line, '\n')) != NULL) {
 661                                 *eol = '\0';
 662
 663                                 add_history(cmd->line);
 664                                 append_history(1, history_file);
 665
 666                                 if (echo_command)
 667                                         printf("%s%s\n", vtysh_prompt(),
 668                                                cmd->line);
 669
 670                                 if (logfile)
 671                                         log_it(cmd->line);
 672
 673                                 ret = vtysh_execute_no_pager(cmd->line);
 674                                 if (!no_error
 675                                     && !(ret == CMD_SUCCESS
 676                                          || ret == CMD_SUCCESS_DAEMON
 677                                          || ret == CMD_WARNING))
 678                                         exit(1);
 679
 680                                 cmd->line = eol + 1;
 681                         }
 682
 683                         add_history(cmd->line);
 684                         append_history(1, history_file);
 685
 686                         if (echo_command)
 687                                 printf("%s%s\n", vtysh_prompt(), cmd->line);
 688
 689                         if (logfile)
 690                                 log_it(cmd->line);
 691
 692                         /*
 693                          * Parsing logic for regular commands will be different
 694                          * than for those commands requiring further
 695                          * processing, such as cli instructions terminating
 696                          * with question-mark character.
 697                          */
 698                         if (!vtysh_execute_command_questionmark(cmd->line))
 699                                 ret = CMD_SUCCESS;
 700                         else
 701                                 ret = vtysh_execute_no_pager(cmd->line);
 702
 703                         if (!no_error
 704                             && !(ret == CMD_SUCCESS || ret == CMD_SUCCESS_DAEMON
 705                                  || ret == CMD_WARNING))
 706                                 exit(1);
 707
 708                         {
 709                                 struct cmd_rec *cr;
 710                                 cr = cmd;
 711                                 cmd = cmd->next;
 712                                 XFREE(MTYPE_TMP, cr);
 713                         }
 714                 }
 715
 716                 history_truncate_file(history_file, 1000);
 717                 exit(0);
 718         }
 719
 720         /* Boot startup configuration file. */
 721         if (boot_flag) {
 722                 vtysh_flock_config(frr_config);
 723                 ret = vtysh_read_config(frr_config, dryrun);
 724                 vtysh_unflock_config();
 725                 if (ret) {
 726                         fprintf(stderr,
 727                                 "Configuration file[%s] processing failure: %d\n",
 728                                 frr_config, ret);
 729                         if (no_error)
 730                                 exit(0);
 731                         else
 732                                 exit(ret);
 733                 } else
 734                         exit(0);
 735         }
 736
 737         vtysh_readline_init();
 738
 739         vty_hello(vty);
 740
 741         /* Enter into enable node. */
 742         if (!user_mode)
 743                 vtysh_execute("enable");
 744
 745         vtysh_add_timestamp = ts_flag;
 746
 747         /* Main command loop. */
 748         vtysh_rl_run();
 749
 750         vtysh_uninit();
 751
 752         history_truncate_file(history_file, 1000);
 753         printf("\n");
 754
 755         /* Rest in peace. */
 756         exit(0);
 757 }