lib/vty.c

   1 /*
   2  * Virtual terminal [aka TeletYpe] interface routine.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "linklist.h"
  26 #include "thread.h"
  27 #include "buffer.h"
  28 #include <lib/version.h>
  29 #include "command.h"
  30 #include "sockunion.h"
  31 #include "memory.h"
  32 #include "log.h"
  33 #include "prefix.h"
  34 #include "filter.h"
  35 #include "vty.h"
  36 #include "privs.h"
  37 #include "network.h"
  38
  39 #include <arpa/telnet.h>
  40 #include <termios.h>
  41
  42 DEFINE_MTYPE_STATIC(LIB, VTY,         "VTY")
  43 DEFINE_MTYPE_STATIC(LIB, VTY_OUT_BUF, "VTY output buffer")
  44 DEFINE_MTYPE_STATIC(LIB, VTY_HIST,    "VTY history")
  45
  46 /* Vty events */
  47 enum event
  48 {
  49   VTY_SERV,
  50   VTY_READ,
  51   VTY_WRITE,
  52   VTY_TIMEOUT_RESET,
  53 #ifdef VTYSH
  54   VTYSH_SERV,
  55   VTYSH_READ,
  56   VTYSH_WRITE
  57 #endif /* VTYSH */
  58 };
  59
  60 static void vty_event (enum event, int, struct vty *);
  61
  62 /* Extern host structure from command.c */
  63 extern struct host host;
  64
  65 /* Vector which store each vty structure. */
  66 static vector vtyvec;
  67
  68 /* Vty timeout value. */
  69 static unsigned long vty_timeout_val = VTY_TIMEOUT_DEFAULT;
  70
  71 /* Vty access-class command */
  72 static char *vty_accesslist_name = NULL;
  73
  74 /* Vty access-calss for IPv6. */
  75 static char *vty_ipv6_accesslist_name = NULL;
  76
  77 /* VTY server thread. */
  78 static vector Vvty_serv_thread;
  79
  80 /* Current directory. */
  81 char *vty_cwd = NULL;
  82
  83 /* Configure lock. */
  84 static int vty_config;
  85 static int vty_config_is_lockless = 0;
  86
  87 /* Login password check. */
  88 static int no_password_check = 0;
  89
  90 /* Integrated configuration file path */
  91 char integrate_default[] = SYSCONFDIR INTEGRATE_DEFAULT_CONFIG;
  92
  93 static int do_log_commands = 0;
  94
  95 /* VTY standard output function. */
  96 int
  97 vty_out (struct vty *vty, const char *format, ...)
  98 {
  99   va_list args;
 100   int len = 0;
 101   int size = 1024;
 102   char buf[1024];
 103   char *p = NULL;
 104
 105   if (vty_shell (vty))
 106     {
 107       va_start (args, format);
 108       vprintf (format, args);
 109       va_end (args);
 110     }
 111   else
 112     {
 113       /* Try to write to initial buffer.  */
 114       va_start (args, format);
 115       len = vsnprintf (buf, sizeof(buf), format, args);
 116       va_end (args);
 117
 118       /* Initial buffer is not enough.  */
 119       if (len < 0 || len >= size)
 120         {
 121           while (1)
 122             {
 123               if (len > -1)
 124                 size = len + 1;
 125               else
 126                 size = size * 2;
 127
 128               p = XREALLOC (MTYPE_VTY_OUT_BUF, p, size);
 129               if (! p)
 130                 return -1;
 131
 132               va_start (args, format);
 133               len = vsnprintf (p, size, format, args);
 134               va_end (args);
 135
 136               if (len > -1 && len < size)
 137                 break;
 138             }
 139         }
 140
 141       /* When initial buffer is enough to store all output.  */
 142       if (! p)
 143         p = buf;
 144
 145       /* Pointer p must point out buffer. */
 146       buffer_put (vty->obuf, (u_char *) p, len);
 147
 148       /* If p is not different with buf, it is allocated buffer.  */
 149       if (p != buf)
 150         XFREE (MTYPE_VTY_OUT_BUF, p);
 151     }
 152
 153   return len;
 154 }
 155
 156 static int
 157 vty_log_out (struct vty *vty, const char *level, const char *proto_str,
 158              const char *format, struct timestamp_control *ctl, va_list va)
 159 {
 160   int ret;
 161   int len;
 162   char buf[1024];
 163
 164   if (!ctl->already_rendered)
 165     {
 166       ctl->len = quagga_timestamp(ctl->precision, ctl->buf, sizeof(ctl->buf));
 167       ctl->already_rendered = 1;
 168     }
 169   if (ctl->len+1 >= sizeof(buf))
 170     return -1;
 171   memcpy(buf, ctl->buf, len = ctl->len);
 172   buf[len++] = ' ';
 173   buf[len] = '\0';
 174
 175   if (level)
 176     ret = snprintf(buf+len, sizeof(buf)-len, "%s: %s: ", level, proto_str);
 177   else
 178     ret = snprintf(buf+len, sizeof(buf)-len, "%s: ", proto_str);
 179   if ((ret < 0) || ((size_t)(len += ret) >= sizeof(buf)))
 180     return -1;
 181
 182   if (((ret = vsnprintf(buf+len, sizeof(buf)-len, format, va)) < 0) ||
 183       ((size_t)((len += ret)+2) > sizeof(buf)))
 184     return -1;
 185
 186   buf[len++] = '\r';
 187   buf[len++] = '\n';
 188
 189   if (write(vty->wfd, buf, len) < 0)
 190     {
 191       if (ERRNO_IO_RETRY(errno))
 192         /* Kernel buffer is full, probably too much debugging output, so just
 193            drop the data and ignore. */
 194         return -1;
 195       /* Fatal I/O error. */
 196       vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
 197       zlog_warn("%s: write failed to vty client fd %d, closing: %s",
 198                 __func__, vty->fd, safe_strerror(errno));
 199       buffer_reset(vty->obuf);
 200       /* cannot call vty_close, because a parent routine may still try
 201          to access the vty struct */
 202       vty->status = VTY_CLOSE;
 203       shutdown(vty->fd, SHUT_RDWR);
 204       return -1;
 205     }
 206   return 0;
 207 }
 208
 209 /* Output current time to the vty. */
 210 void
 211 vty_time_print (struct vty *vty, int cr)
 212 {
 213   char buf[QUAGGA_TIMESTAMP_LEN];
 214
 215   if (quagga_timestamp(0, buf, sizeof(buf)) == 0)
 216     {
 217       zlog (NULL, LOG_INFO, "quagga_timestamp error");
 218       return;
 219     }
 220   if (cr)
 221     vty_out (vty, "%s\n", buf);
 222   else
 223     vty_out (vty, "%s ", buf);
 224
 225   return;
 226 }
 227
 228 /* Say hello to vty interface. */
 229 void
 230 vty_hello (struct vty *vty)
 231 {
 232   if (host.motdfile)
 233     {
 234       FILE *f;
 235       char buf[4096];
 236
 237       f = fopen (host.motdfile, "r");
 238       if (f)
 239         {
 240           while (fgets (buf, sizeof (buf), f))
 241             {
 242               char *s;
 243               /* work backwards to ignore trailling isspace() */
 244               for (s = buf + strlen (buf); (s > buf) && isspace ((int)*(s - 1));
 245                    s--);
 246               *s = '\0';
 247               vty_out (vty, "%s%s", buf, VTY_NEWLINE);
 248             }
 249           fclose (f);
 250         }
 251       else
 252         vty_out (vty, "MOTD file not found%s", VTY_NEWLINE);
 253     }
 254   else if (host.motd)
 255     vty_out (vty, "%s", host.motd);
 256 }
 257
 258 /* Put out prompt and wait input from user. */
 259 static void
 260 vty_prompt (struct vty *vty)
 261 {
 262   struct utsname names;
 263   const char*hostname;
 264
 265   if (vty->type == VTY_TERM)
 266     {
 267       hostname = host.name;
 268       if (!hostname)
 269         {
 270           uname (&names);
 271           hostname = names.nodename;
 272         }
 273       vty_out (vty, cmd_prompt (vty->node), hostname);
 274     }
 275 }
 276
 277 /* Send WILL TELOPT_ECHO to remote server. */
 278 static void
 279 vty_will_echo (struct vty *vty)
 280 {
 281   unsigned char cmd[] = { IAC, WILL, TELOPT_ECHO, '\0' };
 282   vty_out (vty, "%s", cmd);
 283 }
 284
 285 /* Make suppress Go-Ahead telnet option. */
 286 static void
 287 vty_will_suppress_go_ahead (struct vty *vty)
 288 {
 289   unsigned char cmd[] = { IAC, WILL, TELOPT_SGA, '\0' };
 290   vty_out (vty, "%s", cmd);
 291 }
 292
 293 /* Make don't use linemode over telnet. */
 294 static void
 295 vty_dont_linemode (struct vty *vty)
 296 {
 297   unsigned char cmd[] = { IAC, DONT, TELOPT_LINEMODE, '\0' };
 298   vty_out (vty, "%s", cmd);
 299 }
 300
 301 /* Use window size. */
 302 static void
 303 vty_do_window_size (struct vty *vty)
 304 {
 305   unsigned char cmd[] = { IAC, DO, TELOPT_NAWS, '\0' };
 306   vty_out (vty, "%s", cmd);
 307 }
 308
 309 #if 0 /* Currently not used. */
 310 /* Make don't use lflow vty interface. */
 311 static void
 312 vty_dont_lflow_ahead (struct vty *vty)
 313 {
 314   unsigned char cmd[] = { IAC, DONT, TELOPT_LFLOW, '\0' };
 315   vty_out (vty, "%s", cmd);
 316 }
 317 #endif /* 0 */
 318
 319 /* Allocate new vty struct. */
 320 struct vty *
 321 vty_new ()
 322 {
 323   struct vty *new = XCALLOC (MTYPE_VTY, sizeof (struct vty));
 324
 325   new->obuf = buffer_new(0);    /* Use default buffer size. */
 326   new->buf = XCALLOC (MTYPE_VTY, VTY_BUFSIZ);
 327   new->error_buf = XCALLOC (MTYPE_VTY, VTY_BUFSIZ);
 328   new->max = VTY_BUFSIZ;
 329
 330   return new;
 331 }
 332
 333 /* Authentication of vty */
 334 static void
 335 vty_auth (struct vty *vty, char *buf)
 336 {
 337   char *passwd = NULL;
 338   enum node_type next_node = 0;
 339   int fail;
 340   char *crypt (const char *, const char *);
 341
 342   switch (vty->node)
 343     {
 344     case AUTH_NODE:
 345       if (host.encrypt)
 346         passwd = host.password_encrypt;
 347       else
 348         passwd = host.password;
 349       if (host.advanced)
 350         next_node = host.enable ? VIEW_NODE : ENABLE_NODE;
 351       else
 352         next_node = VIEW_NODE;
 353       break;
 354     case AUTH_ENABLE_NODE:
 355       if (host.encrypt)
 356         passwd = host.enable_encrypt;
 357       else
 358         passwd = host.enable;
 359       next_node = ENABLE_NODE;
 360       break;
 361     }
 362
 363   if (passwd)
 364     {
 365       if (host.encrypt)
 366         fail = strcmp (crypt(buf, passwd), passwd);
 367       else
 368         fail = strcmp (buf, passwd);
 369     }
 370   else
 371     fail = 1;
 372
 373   if (! fail)
 374     {
 375       vty->fail = 0;
 376       vty->node = next_node;    /* Success ! */
 377     }
 378   else
 379     {
 380       vty->fail++;
 381       if (vty->fail >= 3)
 382         {
 383           if (vty->node == AUTH_NODE)
 384             {
 385               vty_out (vty, "%% Bad passwords, too many failures!%s", VTY_NEWLINE);
 386               vty->status = VTY_CLOSE;
 387             }
 388           else
 389             {
 390               /* AUTH_ENABLE_NODE */
 391               vty->fail = 0;
 392               vty_out (vty, "%% Bad enable passwords, too many failures!%s", VTY_NEWLINE);
 393               vty->status = VTY_CLOSE;
 394             }
 395         }
 396     }
 397 }
 398
 399 /* Command execution over the vty interface. */
 400 static int
 401 vty_command (struct vty *vty, char *buf)
 402 {
 403   int ret;
 404   vector vline;
 405   const char *protocolname;
 406   char *cp = NULL;
 407
 408   /*
 409    * Log non empty command lines
 410    */
 411   if (do_log_commands)
 412     cp = buf;
 413   if (cp != NULL)
 414     {
 415       /* Skip white spaces. */
 416       while (isspace ((int) *cp) && *cp != '\0')
 417         cp++;
 418     }
 419   if (cp != NULL && *cp != '\0')
 420     {
 421       unsigned i;
 422       char      vty_str[VTY_BUFSIZ];
 423       char        prompt_str[VTY_BUFSIZ];
 424
 425       /* format the base vty info */
 426       snprintf(vty_str, sizeof(vty_str), "vty[??]@%s", vty->address);
 427       if (vty)
 428         for (i = 0; i < vector_active (vtyvec); i++)
 429           if (vty == vector_slot (vtyvec, i))
 430             {
 431               snprintf(vty_str, sizeof(vty_str), "vty[%d]@%s",
 432                                                  i, vty->address);
 433               break;
 434             }
 435
 436       /* format the prompt */
 437       snprintf(prompt_str, sizeof(prompt_str), cmd_prompt (vty->node), vty_str);
 438
 439       /* now log the command */
 440       zlog(NULL, LOG_ERR, "%s%s", prompt_str, buf);
 441     }
 442   /* Split readline string up into the vector */
 443   vline = cmd_make_strvec (buf);
 444
 445   if (vline == NULL)
 446     return CMD_SUCCESS;
 447
 448 #ifdef CONSUMED_TIME_CHECK
 449   {
 450     RUSAGE_T before;
 451     RUSAGE_T after;
 452     unsigned long realtime, cputime;
 453
 454     GETRUSAGE(&before);
 455 #endif /* CONSUMED_TIME_CHECK */
 456
 457   ret = cmd_execute_command (vline, vty, NULL, 0);
 458
 459   /* Get the name of the protocol if any */
 460   if (zlog_default)
 461       protocolname = zlog_proto_names[zlog_default->protocol];
 462   else
 463       protocolname = zlog_proto_names[ZLOG_NONE];
 464
 465 #ifdef CONSUMED_TIME_CHECK
 466     GETRUSAGE(&after);
 467     if ((realtime = thread_consumed_time(&after, &before, &cputime)) >
 468         CONSUMED_TIME_CHECK)
 469       /* Warn about CPU hog that must be fixed. */
 470       zlog_warn("SLOW COMMAND: command took %lums (cpu time %lums): %s",
 471                 realtime/1000, cputime/1000, buf);
 472   }
 473 #endif /* CONSUMED_TIME_CHECK */
 474
 475   if (ret != CMD_SUCCESS)
 476     switch (ret)
 477       {
 478       case CMD_WARNING:
 479         if (vty->type == VTY_FILE)
 480           vty_out (vty, "Warning...%s", VTY_NEWLINE);
 481         break;
 482       case CMD_ERR_AMBIGUOUS:
 483         vty_out (vty, "%% Ambiguous command.%s", VTY_NEWLINE);
 484         break;
 485       case CMD_ERR_NO_MATCH:
 486         vty_out (vty, "%% [%s] Unknown command: %s%s", protocolname, buf, VTY_NEWLINE);
 487         break;
 488       case CMD_ERR_INCOMPLETE:
 489         vty_out (vty, "%% Command incomplete.%s", VTY_NEWLINE);
 490         break;
 491       }
 492   cmd_free_strvec (vline);
 493
 494   return ret;
 495 }
 496
 497 static const char telnet_backward_char = 0x08;
 498 static const char telnet_space_char = ' ';
 499
 500 /* Basic function to write buffer to vty. */
 501 static void
 502 vty_write (struct vty *vty, const char *buf, size_t nbytes)
 503 {
 504   if ((vty->node == AUTH_NODE) || (vty->node == AUTH_ENABLE_NODE))
 505     return;
 506
 507   /* Should we do buffering here ?  And make vty_flush (vty) ? */
 508   buffer_put (vty->obuf, buf, nbytes);
 509 }
 510
 511 /* Basic function to insert character into vty. */
 512 static void
 513 vty_self_insert (struct vty *vty, char c)
 514 {
 515   int i;
 516   int length;
 517
 518   if (vty->length + 1 >= VTY_BUFSIZ)
 519     return;
 520
 521   length = vty->length - vty->cp;
 522   memmove (&vty->buf[vty->cp + 1], &vty->buf[vty->cp], length);
 523   vty->buf[vty->cp] = c;
 524
 525   vty_write (vty, &vty->buf[vty->cp], length + 1);
 526   for (i = 0; i < length; i++)
 527     vty_write (vty, &telnet_backward_char, 1);
 528
 529   vty->cp++;
 530   vty->length++;
 531
 532   vty->buf[vty->length] = '\0';
 533 }
 534
 535 /* Self insert character 'c' in overwrite mode. */
 536 static void
 537 vty_self_insert_overwrite (struct vty *vty, char c)
 538 {
 539   if (vty->cp == vty->length)
 540     {
 541       vty_self_insert (vty, c);
 542       return;
 543     }
 544
 545   vty->buf[vty->cp++] = c;
 546   vty_write (vty, &c, 1);
 547 }
 548
 549 /**
 550  * Insert a string into vty->buf at the current cursor position.
 551  *
 552  * If the resultant string would be larger than VTY_BUFSIZ it is
 553  * truncated to fit.
 554  */
 555 static void
 556 vty_insert_word_overwrite (struct vty *vty, char *str)
 557 {
 558   if (vty->cp == VTY_BUFSIZ)
 559     return;
 560
 561   size_t nwrite = MIN ((int) strlen (str), VTY_BUFSIZ - vty->cp - 1);
 562   memcpy (&vty->buf[vty->cp], str, nwrite);
 563   vty->cp += nwrite;
 564   vty->length = MAX (vty->cp, vty->length);
 565   vty->buf[vty->length] = '\0';
 566   vty_write (vty, str, nwrite);
 567 }
 568
 569 /* Forward character. */
 570 static void
 571 vty_forward_char (struct vty *vty)
 572 {
 573   if (vty->cp < vty->length)
 574     {
 575       vty_write (vty, &vty->buf[vty->cp], 1);
 576       vty->cp++;
 577     }
 578 }
 579
 580 /* Backward character. */
 581 static void
 582 vty_backward_char (struct vty *vty)
 583 {
 584   if (vty->cp > 0)
 585     {
 586       vty->cp--;
 587       vty_write (vty, &telnet_backward_char, 1);
 588     }
 589 }
 590
 591 /* Move to the beginning of the line. */
 592 static void
 593 vty_beginning_of_line (struct vty *vty)
 594 {
 595   while (vty->cp)
 596     vty_backward_char (vty);
 597 }
 598
 599 /* Move to the end of the line. */
 600 static void
 601 vty_end_of_line (struct vty *vty)
 602 {
 603   while (vty->cp < vty->length)
 604     vty_forward_char (vty);
 605 }
 606
 607 static void vty_kill_line_from_beginning (struct vty *);
 608 static void vty_redraw_line (struct vty *);
 609
 610 /* Print command line history.  This function is called from
 611    vty_next_line and vty_previous_line. */
 612 static void
 613 vty_history_print (struct vty *vty)
 614 {
 615   int length;
 616
 617   vty_kill_line_from_beginning (vty);
 618
 619   /* Get previous line from history buffer */
 620   length = strlen (vty->hist[vty->hp]);
 621   memcpy (vty->buf, vty->hist[vty->hp], length);
 622   vty->cp = vty->length = length;
 623   vty->buf[vty->length] = '\0';
 624
 625   /* Redraw current line */
 626   vty_redraw_line (vty);
 627 }
 628
 629 /* Show next command line history. */
 630 static void
 631 vty_next_line (struct vty *vty)
 632 {
 633   int try_index;
 634
 635   if (vty->hp == vty->hindex)
 636     return;
 637
 638   /* Try is there history exist or not. */
 639   try_index = vty->hp;
 640   if (try_index == (VTY_MAXHIST - 1))
 641     try_index = 0;
 642   else
 643     try_index++;
 644
 645   /* If there is not history return. */
 646   if (vty->hist[try_index] == NULL)
 647     return;
 648   else
 649     vty->hp = try_index;
 650
 651   vty_history_print (vty);
 652 }
 653
 654 /* Show previous command line history. */
 655 static void
 656 vty_previous_line (struct vty *vty)
 657 {
 658   int try_index;
 659
 660   try_index = vty->hp;
 661   if (try_index == 0)
 662     try_index = VTY_MAXHIST - 1;
 663   else
 664     try_index--;
 665
 666   if (vty->hist[try_index] == NULL)
 667     return;
 668   else
 669     vty->hp = try_index;
 670
 671   vty_history_print (vty);
 672 }
 673
 674 /* This function redraw all of the command line character. */
 675 static void
 676 vty_redraw_line (struct vty *vty)
 677 {
 678   vty_write (vty, vty->buf, vty->length);
 679   vty->cp = vty->length;
 680 }
 681
 682 /* Forward word. */
 683 static void
 684 vty_forward_word (struct vty *vty)
 685 {
 686   while (vty->cp != vty->length && vty->buf[vty->cp] != ' ')
 687     vty_forward_char (vty);
 688
 689   while (vty->cp != vty->length && vty->buf[vty->cp] == ' ')
 690     vty_forward_char (vty);
 691 }
 692
 693 /* Backward word without skipping training space. */
 694 static void
 695 vty_backward_pure_word (struct vty *vty)
 696 {
 697   while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
 698     vty_backward_char (vty);
 699 }
 700
 701 /* Backward word. */
 702 static void
 703 vty_backward_word (struct vty *vty)
 704 {
 705   while (vty->cp > 0 && vty->buf[vty->cp - 1] == ' ')
 706     vty_backward_char (vty);
 707
 708   while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
 709     vty_backward_char (vty);
 710 }
 711
 712 /* When '^D' is typed at the beginning of the line we move to the down
 713    level. */
 714 static void
 715 vty_down_level (struct vty *vty)
 716 {
 717   vty_out (vty, "%s", VTY_NEWLINE);
 718   cmd_exit (vty);
 719   vty_prompt (vty);
 720   vty->cp = 0;
 721 }
 722
 723 /* When '^Z' is received from vty, move down to the enable mode. */
 724 static void
 725 vty_end_config (struct vty *vty)
 726 {
 727   vty_out (vty, "%s", VTY_NEWLINE);
 728
 729   switch (vty->node)
 730     {
 731     case VIEW_NODE:
 732     case ENABLE_NODE:
 733       /* Nothing to do. */
 734       break;
 735     case CONFIG_NODE:
 736     case INTERFACE_NODE:
 737     case ZEBRA_NODE:
 738     case RIP_NODE:
 739     case RIPNG_NODE:
 740     case BGP_NODE:
 741     case BGP_VPNV4_NODE:
 742     case BGP_VPNV6_NODE:
 743     case BGP_ENCAP_NODE:
 744     case BGP_ENCAPV6_NODE:
 745     case BGP_VRF_POLICY_NODE:
 746     case BGP_VNC_DEFAULTS_NODE:
 747     case BGP_VNC_NVE_GROUP_NODE:
 748     case BGP_VNC_L2_GROUP_NODE:
 749     case BGP_IPV4_NODE:
 750     case BGP_IPV4M_NODE:
 751     case BGP_IPV6_NODE:
 752     case BGP_IPV6M_NODE:
 753     case BGP_EVPN_NODE:
 754     case RMAP_NODE:
 755     case OSPF_NODE:
 756     case OSPF6_NODE:
 757     case LDP_NODE:
 758     case LDP_IPV4_NODE:
 759     case LDP_IPV6_NODE:
 760     case LDP_IPV4_IFACE_NODE:
 761     case LDP_IPV6_IFACE_NODE:
 762     case LDP_L2VPN_NODE:
 763     case LDP_PSEUDOWIRE_NODE:
 764     case ISIS_NODE:
 765     case KEYCHAIN_NODE:
 766     case KEYCHAIN_KEY_NODE:
 767     case MASC_NODE:
 768     case PIM_NODE:
 769     case VTY_NODE:
 770       vty_config_unlock (vty);
 771       vty->node = ENABLE_NODE;
 772       break;
 773     default:
 774       /* Unknown node, we have to ignore it. */
 775       break;
 776     }
 777
 778   vty_prompt (vty);
 779   vty->cp = 0;
 780 }
 781
 782 /* Delete a charcter at the current point. */
 783 static void
 784 vty_delete_char (struct vty *vty)
 785 {
 786   int i;
 787   int size;
 788
 789   if (vty->length == 0)
 790     {
 791       vty_down_level (vty);
 792       return;
 793     }
 794
 795   if (vty->cp == vty->length)
 796     return;                     /* completion need here? */
 797
 798   size = vty->length - vty->cp;
 799
 800   vty->length--;
 801   memmove (&vty->buf[vty->cp], &vty->buf[vty->cp + 1], size - 1);
 802   vty->buf[vty->length] = '\0';
 803
 804   if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
 805     return;
 806
 807   vty_write (vty, &vty->buf[vty->cp], size - 1);
 808   vty_write (vty, &telnet_space_char, 1);
 809
 810   for (i = 0; i < size; i++)
 811     vty_write (vty, &telnet_backward_char, 1);
 812 }
 813
 814 /* Delete a character before the point. */
 815 static void
 816 vty_delete_backward_char (struct vty *vty)
 817 {
 818   if (vty->cp == 0)
 819     return;
 820
 821   vty_backward_char (vty);
 822   vty_delete_char (vty);
 823 }
 824
 825 /* Kill rest of line from current point. */
 826 static void
 827 vty_kill_line (struct vty *vty)
 828 {
 829   int i;
 830   int size;
 831
 832   size = vty->length - vty->cp;
 833
 834   if (size == 0)
 835     return;
 836
 837   for (i = 0; i < size; i++)
 838     vty_write (vty, &telnet_space_char, 1);
 839   for (i = 0; i < size; i++)
 840     vty_write (vty, &telnet_backward_char, 1);
 841
 842   memset (&vty->buf[vty->cp], 0, size);
 843   vty->length = vty->cp;
 844 }
 845
 846 /* Kill line from the beginning. */
 847 static void
 848 vty_kill_line_from_beginning (struct vty *vty)
 849 {
 850   vty_beginning_of_line (vty);
 851   vty_kill_line (vty);
 852 }
 853
 854 /* Delete a word before the point. */
 855 static void
 856 vty_forward_kill_word (struct vty *vty)
 857 {
 858   while (vty->cp != vty->length && vty->buf[vty->cp] == ' ')
 859     vty_delete_char (vty);
 860   while (vty->cp != vty->length && vty->buf[vty->cp] != ' ')
 861     vty_delete_char (vty);
 862 }
 863
 864 /* Delete a word before the point. */
 865 static void
 866 vty_backward_kill_word (struct vty *vty)
 867 {
 868   while (vty->cp > 0 && vty->buf[vty->cp - 1] == ' ')
 869     vty_delete_backward_char (vty);
 870   while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
 871     vty_delete_backward_char (vty);
 872 }
 873
 874 /* Transpose chars before or at the point. */
 875 static void
 876 vty_transpose_chars (struct vty *vty)
 877 {
 878   char c1, c2;
 879
 880   /* If length is short or point is near by the beginning of line then
 881      return. */
 882   if (vty->length < 2 || vty->cp < 1)
 883     return;
 884
 885   /* In case of point is located at the end of the line. */
 886   if (vty->cp == vty->length)
 887     {
 888       c1 = vty->buf[vty->cp - 1];
 889       c2 = vty->buf[vty->cp - 2];
 890
 891       vty_backward_char (vty);
 892       vty_backward_char (vty);
 893       vty_self_insert_overwrite (vty, c1);
 894       vty_self_insert_overwrite (vty, c2);
 895     }
 896   else
 897     {
 898       c1 = vty->buf[vty->cp];
 899       c2 = vty->buf[vty->cp - 1];
 900
 901       vty_backward_char (vty);
 902       vty_self_insert_overwrite (vty, c1);
 903       vty_self_insert_overwrite (vty, c2);
 904     }
 905 }
 906
 907 /* Do completion at vty interface. */
 908 static void
 909 vty_complete_command (struct vty *vty)
 910 {
 911   int i;
 912   int ret;
 913   char **matched = NULL;
 914   vector vline;
 915
 916   if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
 917     return;
 918
 919   vline = cmd_make_strvec (vty->buf);
 920   if (vline == NULL)
 921     return;
 922
 923   /* In case of 'help \t'. */
 924   if (isspace ((int) vty->buf[vty->length - 1]))
 925     vector_set (vline, NULL);
 926
 927   matched = cmd_complete_command (vline, vty, &ret);
 928
 929   cmd_free_strvec (vline);
 930
 931   vty_out (vty, "%s", VTY_NEWLINE);
 932   switch (ret)
 933     {
 934     case CMD_ERR_AMBIGUOUS:
 935       vty_out (vty, "%% Ambiguous command.%s", VTY_NEWLINE);
 936       vty_prompt (vty);
 937       vty_redraw_line (vty);
 938       break;
 939     case CMD_ERR_NO_MATCH:
 940       /* vty_out (vty, "%% There is no matched command.%s", VTY_NEWLINE); */
 941       vty_prompt (vty);
 942       vty_redraw_line (vty);
 943       break;
 944     case CMD_COMPLETE_FULL_MATCH:
 945       if (!matched[0])
 946         {
 947           /* 2016-11-28 equinox -- need to debug, SEGV here */
 948           vty_out (vty, "%% CLI BUG: FULL_MATCH with NULL str%s", VTY_NEWLINE);
 949           vty_prompt (vty);
 950           vty_redraw_line (vty);
 951           break;
 952         }
 953       vty_prompt (vty);
 954       vty_redraw_line (vty);
 955       vty_backward_pure_word (vty);
 956       vty_insert_word_overwrite (vty, matched[0]);
 957       vty_self_insert (vty, ' ');
 958       XFREE (MTYPE_TMP, matched[0]);
 959       break;
 960     case CMD_COMPLETE_MATCH:
 961       vty_prompt (vty);
 962       vty_redraw_line (vty);
 963       vty_backward_pure_word (vty);
 964       vty_insert_word_overwrite (vty, matched[0]);
 965       XFREE (MTYPE_TMP, matched[0]);
 966       break;
 967     case CMD_COMPLETE_LIST_MATCH:
 968       for (i = 0; matched[i] != NULL; i++)
 969         {
 970           if (i != 0 && ((i % 6) == 0))
 971             vty_out (vty, "%s", VTY_NEWLINE);
 972           vty_out (vty, "%-10s ", matched[i]);
 973           XFREE (MTYPE_TMP, matched[i]);
 974         }
 975       vty_out (vty, "%s", VTY_NEWLINE);
 976
 977       vty_prompt (vty);
 978       vty_redraw_line (vty);
 979       break;
 980     case CMD_ERR_NOTHING_TODO:
 981       vty_prompt (vty);
 982       vty_redraw_line (vty);
 983       break;
 984     default:
 985       break;
 986     }
 987   if (matched)
 988     XFREE (MTYPE_TMP, matched);
 989 }
 990
 991 static void
 992 vty_describe_fold (struct vty *vty, int cmd_width,
 993                    unsigned int desc_width, struct cmd_token *token)
 994 {
 995   char *buf;
 996   const char *cmd, *p;
 997   int pos;
 998
 999   cmd = token->text;
1000
1001   if (desc_width <= 0)
1002     {
1003       vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, token->desc, VTY_NEWLINE);
1004       return;
1005     }
1006
1007   buf = XCALLOC (MTYPE_TMP, strlen (token->desc) + 1);
1008
1009   for (p = token->desc; strlen (p) > desc_width; p += pos + 1)
1010     {
1011       for (pos = desc_width; pos > 0; pos--)
1012       if (*(p + pos) == ' ')
1013         break;
1014
1015       if (pos == 0)
1016       break;
1017
1018       strncpy (buf, p, pos);
1019       buf[pos] = '\0';
1020       vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, buf, VTY_NEWLINE);
1021
1022       cmd = "";
1023     }
1024
1025   vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, p, VTY_NEWLINE);
1026
1027   XFREE (MTYPE_TMP, buf);
1028 }
1029
1030 /* Describe matched command function. */
1031 static void
1032 vty_describe_command (struct vty *vty)
1033 {
1034   int ret;
1035   vector vline;
1036   vector describe;
1037   unsigned int i, width, desc_width;
1038   struct cmd_token *token, *token_cr = NULL;
1039
1040   vline = cmd_make_strvec (vty->buf);
1041
1042   /* In case of '> ?'. */
1043   if (vline == NULL)
1044     {
1045       vline = vector_init (1);
1046       vector_set (vline, NULL);
1047     }
1048   else
1049     if (isspace ((int) vty->buf[vty->length - 1]))
1050       vector_set (vline, NULL);
1051
1052   describe = cmd_describe_command (vline, vty, &ret);
1053
1054   vty_out (vty, "%s", VTY_NEWLINE);
1055
1056   /* Ambiguous error. */
1057   switch (ret)
1058     {
1059     case CMD_ERR_AMBIGUOUS:
1060       vty_out (vty, "%% Ambiguous command.%s", VTY_NEWLINE);
1061       goto out;
1062       break;
1063     case CMD_ERR_NO_MATCH:
1064       vty_out (vty, "%% There is no matched command.%s", VTY_NEWLINE);
1065       goto out;
1066       break;
1067     }
1068
1069   /* Get width of command string. */
1070   width = 0;
1071   for (i = 0; i < vector_active (describe); i++)
1072     if ((token = vector_slot (describe, i)) != NULL)
1073       {
1074         unsigned int len;
1075
1076         if (token->text[0] == '\0')
1077           continue;
1078
1079         len = strlen (token->text);
1080
1081         if (width < len)
1082           width = len;
1083       }
1084
1085   /* Get width of description string. */
1086   desc_width = vty->width - (width + 6);
1087
1088   /* Print out description. */
1089   for (i = 0; i < vector_active (describe); i++)
1090     if ((token = vector_slot (describe, i)) != NULL)
1091       {
1092         if (token->text[0] == '\0')
1093           continue;
1094
1095         if (strcmp (token->text, CMD_CR_TEXT) == 0)
1096           {
1097             token_cr = token;
1098             continue;
1099           }
1100
1101         if (!token->desc)
1102           vty_out (vty, "  %-s%s",
1103                    token->text,
1104                    VTY_NEWLINE);
1105         else if (desc_width >= strlen (token->desc))
1106           vty_out (vty, "  %-*s  %s%s", width,
1107                    token->text,
1108                    token->desc, VTY_NEWLINE);
1109         else
1110           vty_describe_fold (vty, width, desc_width, token);
1111
1112 #if 0
1113         vty_out (vty, "  %-*s %s%s", width
1114                  desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
1115                  desc->str ? desc->str : "", VTY_NEWLINE);
1116 #endif /* 0 */
1117       }
1118
1119   if ((token = token_cr))
1120     {
1121       if (!token->desc)
1122         vty_out (vty, "  %-s%s",
1123                  token->text,
1124                  VTY_NEWLINE);
1125       else if (desc_width >= strlen (token->desc))
1126         vty_out (vty, "  %-*s  %s%s", width,
1127                  token->text,
1128                  token->desc, VTY_NEWLINE);
1129       else
1130         vty_describe_fold (vty, width, desc_width, token);
1131     }
1132
1133 out:
1134   cmd_free_strvec (vline);
1135   if (describe)
1136     vector_free (describe);
1137
1138   vty_prompt (vty);
1139   vty_redraw_line (vty);
1140 }
1141
1142 static void
1143 vty_clear_buf (struct vty *vty)
1144 {
1145   memset (vty->buf, 0, vty->max);
1146 }
1147
1148 /* ^C stop current input and do not add command line to the history. */
1149 static void
1150 vty_stop_input (struct vty *vty)
1151 {
1152   vty->cp = vty->length = 0;
1153   vty_clear_buf (vty);
1154   vty_out (vty, "%s", VTY_NEWLINE);
1155
1156   switch (vty->node)
1157     {
1158     case VIEW_NODE:
1159     case ENABLE_NODE:
1160       /* Nothing to do. */
1161       break;
1162     case CONFIG_NODE:
1163     case INTERFACE_NODE:
1164     case ZEBRA_NODE:
1165     case RIP_NODE:
1166     case RIPNG_NODE:
1167     case BGP_NODE:
1168     case RMAP_NODE:
1169     case OSPF_NODE:
1170     case OSPF6_NODE:
1171     case LDP_NODE:
1172     case LDP_IPV4_NODE:
1173     case LDP_IPV6_NODE:
1174     case LDP_IPV4_IFACE_NODE:
1175     case LDP_IPV6_IFACE_NODE:
1176     case LDP_L2VPN_NODE:
1177     case LDP_PSEUDOWIRE_NODE:
1178     case ISIS_NODE:
1179     case KEYCHAIN_NODE:
1180     case KEYCHAIN_KEY_NODE:
1181     case MASC_NODE:
1182     case PIM_NODE:
1183     case VTY_NODE:
1184       vty_config_unlock (vty);
1185       vty->node = ENABLE_NODE;
1186       break;
1187     default:
1188       /* Unknown node, we have to ignore it. */
1189       break;
1190     }
1191   vty_prompt (vty);
1192
1193   /* Set history pointer to the latest one. */
1194   vty->hp = vty->hindex;
1195 }
1196
1197 /* Add current command line to the history buffer. */
1198 static void
1199 vty_hist_add (struct vty *vty)
1200 {
1201   int index;
1202
1203   if (vty->length == 0)
1204     return;
1205
1206   index = vty->hindex ? vty->hindex - 1 : VTY_MAXHIST - 1;
1207
1208   /* Ignore the same string as previous one. */
1209   if (vty->hist[index])
1210     if (strcmp (vty->buf, vty->hist[index]) == 0)
1211       {
1212       vty->hp = vty->hindex;
1213       return;
1214       }
1215
1216   /* Insert history entry. */
1217   if (vty->hist[vty->hindex])
1218     XFREE (MTYPE_VTY_HIST, vty->hist[vty->hindex]);
1219   vty->hist[vty->hindex] = XSTRDUP (MTYPE_VTY_HIST, vty->buf);
1220
1221   /* History index rotation. */
1222   vty->hindex++;
1223   if (vty->hindex == VTY_MAXHIST)
1224     vty->hindex = 0;
1225
1226   vty->hp = vty->hindex;
1227 }
1228
1229 /* #define TELNET_OPTION_DEBUG */
1230
1231 /* Get telnet window size. */
1232 static int
1233 vty_telnet_option (struct vty *vty, unsigned char *buf, int nbytes)
1234 {
1235 #ifdef TELNET_OPTION_DEBUG
1236   int i;
1237
1238   for (i = 0; i < nbytes; i++)
1239     {
1240       switch (buf[i])
1241         {
1242         case IAC:
1243           vty_out (vty, "IAC ");
1244           break;
1245         case WILL:
1246           vty_out (vty, "WILL ");
1247           break;
1248         case WONT:
1249           vty_out (vty, "WONT ");
1250           break;
1251         case DO:
1252           vty_out (vty, "DO ");
1253           break;
1254         case DONT:
1255           vty_out (vty, "DONT ");
1256           break;
1257         case SB:
1258           vty_out (vty, "SB ");
1259           break;
1260         case SE:
1261           vty_out (vty, "SE ");
1262           break;
1263         case TELOPT_ECHO:
1264           vty_out (vty, "TELOPT_ECHO %s", VTY_NEWLINE);
1265           break;
1266         case TELOPT_SGA:
1267           vty_out (vty, "TELOPT_SGA %s", VTY_NEWLINE);
1268           break;
1269         case TELOPT_NAWS:
1270           vty_out (vty, "TELOPT_NAWS %s", VTY_NEWLINE);
1271           break;
1272         default:
1273           vty_out (vty, "%x ", buf[i]);
1274           break;
1275         }
1276     }
1277   vty_out (vty, "%s", VTY_NEWLINE);
1278
1279 #endif /* TELNET_OPTION_DEBUG */
1280
1281   switch (buf[0])
1282     {
1283     case SB:
1284       vty->sb_len = 0;
1285       vty->iac_sb_in_progress = 1;
1286       return 0;
1287       break;
1288     case SE:
1289       {
1290         if (!vty->iac_sb_in_progress)
1291           return 0;
1292
1293         if ((vty->sb_len == 0) || (vty->sb_buf[0] == '\0'))
1294           {
1295             vty->iac_sb_in_progress = 0;
1296             return 0;
1297           }
1298         switch (vty->sb_buf[0])
1299           {
1300           case TELOPT_NAWS:
1301             if (vty->sb_len != TELNET_NAWS_SB_LEN)
1302               zlog_warn("RFC 1073 violation detected: telnet NAWS option "
1303                         "should send %d characters, but we received %lu",
1304                         TELNET_NAWS_SB_LEN, (u_long)vty->sb_len);
1305             else if (sizeof(vty->sb_buf) < TELNET_NAWS_SB_LEN)
1306               zlog_err("Bug detected: sizeof(vty->sb_buf) %lu < %d, "
1307                        "too small to handle the telnet NAWS option",
1308                        (u_long)sizeof(vty->sb_buf), TELNET_NAWS_SB_LEN);
1309             else
1310               {
1311                 vty->width = ((vty->sb_buf[1] << 8)|vty->sb_buf[2]);
1312                 vty->height = ((vty->sb_buf[3] << 8)|vty->sb_buf[4]);
1313 #ifdef TELNET_OPTION_DEBUG
1314                 vty_out(vty, "TELNET NAWS window size negotiation completed: "
1315                               "width %d, height %d%s",
1316                         vty->width, vty->height, VTY_NEWLINE);
1317 #endif
1318               }
1319             break;
1320           }
1321         vty->iac_sb_in_progress = 0;
1322         return 0;
1323         break;
1324       }
1325     default:
1326       break;
1327     }
1328   return 1;
1329 }
1330
1331 /* Execute current command line. */
1332 static int
1333 vty_execute (struct vty *vty)
1334 {
1335   int ret;
1336
1337   ret = CMD_SUCCESS;
1338
1339   switch (vty->node)
1340     {
1341     case AUTH_NODE:
1342     case AUTH_ENABLE_NODE:
1343       vty_auth (vty, vty->buf);
1344       break;
1345     default:
1346       ret = vty_command (vty, vty->buf);
1347       if (vty->type == VTY_TERM)
1348         vty_hist_add (vty);
1349       break;
1350     }
1351
1352   /* Clear command line buffer. */
1353   vty->cp = vty->length = 0;
1354   vty_clear_buf (vty);
1355
1356   if (vty->status != VTY_CLOSE )
1357     vty_prompt (vty);
1358
1359   return ret;
1360 }
1361
1362 #define CONTROL(X)  ((X) - '@')
1363 #define VTY_NORMAL     0
1364 #define VTY_PRE_ESCAPE 1
1365 #define VTY_ESCAPE     2
1366
1367 /* Escape character command map. */
1368 static void
1369 vty_escape_map (unsigned char c, struct vty *vty)
1370 {
1371   switch (c)
1372     {
1373     case ('A'):
1374       vty_previous_line (vty);
1375       break;
1376     case ('B'):
1377       vty_next_line (vty);
1378       break;
1379     case ('C'):
1380       vty_forward_char (vty);
1381       break;
1382     case ('D'):
1383       vty_backward_char (vty);
1384       break;
1385     default:
1386       break;
1387     }
1388
1389   /* Go back to normal mode. */
1390   vty->escape = VTY_NORMAL;
1391 }
1392
1393 /* Quit print out to the buffer. */
1394 static void
1395 vty_buffer_reset (struct vty *vty)
1396 {
1397   buffer_reset (vty->obuf);
1398   vty_prompt (vty);
1399   vty_redraw_line (vty);
1400 }
1401
1402 /* Read data via vty socket. */
1403 static int
1404 vty_read (struct thread *thread)
1405 {
1406   int i;
1407   int nbytes;
1408   unsigned char buf[VTY_READ_BUFSIZ];
1409
1410   int vty_sock = THREAD_FD (thread);
1411   struct vty *vty = THREAD_ARG (thread);
1412   vty->t_read = NULL;
1413
1414   /* Read raw data from socket */
1415   if ((nbytes = read (vty->fd, buf, VTY_READ_BUFSIZ)) <= 0)
1416     {
1417       if (nbytes < 0)
1418         {
1419           if (ERRNO_IO_RETRY(errno))
1420             {
1421               vty_event (VTY_READ, vty_sock, vty);
1422               return 0;
1423             }
1424           vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
1425           zlog_warn("%s: read error on vty client fd %d, closing: %s",
1426                     __func__, vty->fd, safe_strerror(errno));
1427           buffer_reset(vty->obuf);
1428         }
1429       vty->status = VTY_CLOSE;
1430     }
1431
1432   for (i = 0; i < nbytes; i++)
1433     {
1434       if (buf[i] == IAC)
1435         {
1436           if (!vty->iac)
1437             {
1438               vty->iac = 1;
1439               continue;
1440             }
1441           else
1442             {
1443               vty->iac = 0;
1444             }
1445         }
1446
1447       if (vty->iac_sb_in_progress && !vty->iac)
1448         {
1449             if (vty->sb_len < sizeof(vty->sb_buf))
1450               vty->sb_buf[vty->sb_len] = buf[i];
1451             vty->sb_len++;
1452             continue;
1453         }
1454
1455       if (vty->iac)
1456         {
1457           /* In case of telnet command */
1458           int ret = 0;
1459           ret = vty_telnet_option (vty, buf + i, nbytes - i);
1460           vty->iac = 0;
1461           i += ret;
1462           continue;
1463         }
1464
1465
1466       if (vty->status == VTY_MORE)
1467         {
1468           switch (buf[i])
1469             {
1470             case CONTROL('C'):
1471             case 'q':
1472             case 'Q':
1473               vty_buffer_reset (vty);
1474               break;
1475 #if 0 /* More line does not work for "show ip bgp".  */
1476             case '\n':
1477             case '\r':
1478               vty->status = VTY_MORELINE;
1479               break;
1480 #endif
1481             default:
1482               break;
1483             }
1484           continue;
1485         }
1486
1487       /* Escape character. */
1488       if (vty->escape == VTY_ESCAPE)
1489         {
1490           vty_escape_map (buf[i], vty);
1491           continue;
1492         }
1493
1494       /* Pre-escape status. */
1495       if (vty->escape == VTY_PRE_ESCAPE)
1496         {
1497           switch (buf[i])
1498             {
1499             case '[':
1500               vty->escape = VTY_ESCAPE;
1501               break;
1502             case 'b':
1503               vty_backward_word (vty);
1504               vty->escape = VTY_NORMAL;
1505               break;
1506             case 'f':
1507               vty_forward_word (vty);
1508               vty->escape = VTY_NORMAL;
1509               break;
1510             case 'd':
1511               vty_forward_kill_word (vty);
1512               vty->escape = VTY_NORMAL;
1513               break;
1514             case CONTROL('H'):
1515             case 0x7f:
1516               vty_backward_kill_word (vty);
1517               vty->escape = VTY_NORMAL;
1518               break;
1519             default:
1520               vty->escape = VTY_NORMAL;
1521               break;
1522             }
1523           continue;
1524         }
1525
1526       switch (buf[i])
1527         {
1528         case CONTROL('A'):
1529           vty_beginning_of_line (vty);
1530           break;
1531         case CONTROL('B'):
1532           vty_backward_char (vty);
1533           break;
1534         case CONTROL('C'):
1535           vty_stop_input (vty);
1536           break;
1537         case CONTROL('D'):
1538           vty_delete_char (vty);
1539           break;
1540         case CONTROL('E'):
1541           vty_end_of_line (vty);
1542           break;
1543         case CONTROL('F'):
1544           vty_forward_char (vty);
1545           break;
1546         case CONTROL('H'):
1547         case 0x7f:
1548           vty_delete_backward_char (vty);
1549           break;
1550         case CONTROL('K'):
1551           vty_kill_line (vty);
1552           break;
1553         case CONTROL('N'):
1554           vty_next_line (vty);
1555           break;
1556         case CONTROL('P'):
1557           vty_previous_line (vty);
1558           break;
1559         case CONTROL('T'):
1560           vty_transpose_chars (vty);
1561           break;
1562         case CONTROL('U'):
1563           vty_kill_line_from_beginning (vty);
1564           break;
1565         case CONTROL('W'):
1566           vty_backward_kill_word (vty);
1567           break;
1568         case CONTROL('Z'):
1569           vty_end_config (vty);
1570           break;
1571         case '\n':
1572         case '\r':
1573           vty_out (vty, "%s", VTY_NEWLINE);
1574           vty_execute (vty);
1575           break;
1576         case '\t':
1577           vty_complete_command (vty);
1578           break;
1579         case '?':
1580           if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
1581             vty_self_insert (vty, buf[i]);
1582           else
1583             vty_describe_command (vty);
1584           break;
1585         case '\033':
1586           if (i + 1 < nbytes && buf[i + 1] == '[')
1587             {
1588               vty->escape = VTY_ESCAPE;
1589               i++;
1590             }
1591           else
1592             vty->escape = VTY_PRE_ESCAPE;
1593           break;
1594         default:
1595           if (buf[i] > 31 && buf[i] < 127)
1596             vty_self_insert (vty, buf[i]);
1597           break;
1598         }
1599     }
1600
1601   /* Check status. */
1602   if (vty->status == VTY_CLOSE)
1603     vty_close (vty);
1604   else
1605     {
1606       vty_event (VTY_WRITE, vty->wfd, vty);
1607       vty_event (VTY_READ, vty_sock, vty);
1608     }
1609   return 0;
1610 }
1611
1612 /* Flush buffer to the vty. */
1613 static int
1614 vty_flush (struct thread *thread)
1615 {
1616   int erase;
1617   buffer_status_t flushrc;
1618   int vty_sock = THREAD_FD (thread);
1619   struct vty *vty = THREAD_ARG (thread);
1620
1621   vty->t_write = NULL;
1622
1623   /* Tempolary disable read thread. */
1624   if ((vty->lines == 0) && vty->t_read)
1625     {
1626       thread_cancel (vty->t_read);
1627       vty->t_read = NULL;
1628     }
1629
1630   /* Function execution continue. */
1631   erase = ((vty->status == VTY_MORE || vty->status == VTY_MORELINE));
1632
1633   /* N.B. if width is 0, that means we don't know the window size. */
1634   if ((vty->lines == 0) || (vty->width == 0) || (vty->height == 0))
1635     flushrc = buffer_flush_available(vty->obuf, vty_sock);
1636   else if (vty->status == VTY_MORELINE)
1637     flushrc = buffer_flush_window(vty->obuf, vty_sock, vty->width,
1638                                   1, erase, 0);
1639   else
1640     flushrc = buffer_flush_window(vty->obuf, vty_sock, vty->width,
1641                                   vty->lines >= 0 ? vty->lines :
1642                                                     vty->height,
1643                                   erase, 0);
1644   switch (flushrc)
1645     {
1646     case BUFFER_ERROR:
1647       vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
1648       zlog_warn("buffer_flush failed on vty client fd %d, closing",
1649                 vty->fd);
1650       buffer_reset(vty->obuf);
1651       vty_close(vty);
1652       return 0;
1653     case BUFFER_EMPTY:
1654       if (vty->status == VTY_CLOSE)
1655         vty_close (vty);
1656       else
1657         {
1658           vty->status = VTY_NORMAL;
1659           if (vty->lines == 0)
1660             vty_event (VTY_READ, vty_sock, vty);
1661         }
1662       break;
1663     case BUFFER_PENDING:
1664       /* There is more data waiting to be written. */
1665       vty->status = VTY_MORE;
1666       if (vty->lines == 0)
1667         vty_event (VTY_WRITE, vty_sock, vty);
1668       break;
1669     }
1670
1671   return 0;
1672 }
1673
1674 /* allocate and initialise vty */
1675 static struct vty *
1676 vty_new_init (int vty_sock)
1677 {
1678   struct vty *vty;
1679
1680   vty = vty_new ();
1681   vty->fd = vty_sock;
1682   vty->wfd = vty_sock;
1683   vty->type = VTY_TERM;
1684   vty->node = AUTH_NODE;
1685   vty->fail = 0;
1686   vty->cp = 0;
1687   vty_clear_buf (vty);
1688   vty->length = 0;
1689   memset (vty->hist, 0, sizeof (vty->hist));
1690   vty->hp = 0;
1691   vty->hindex = 0;
1692   vector_set_index (vtyvec, vty_sock, vty);
1693   vty->status = VTY_NORMAL;
1694   vty->lines = -1;
1695   vty->iac = 0;
1696   vty->iac_sb_in_progress = 0;
1697   vty->sb_len = 0;
1698
1699   return vty;
1700 }
1701
1702 /* Create new vty structure. */
1703 static struct vty *
1704 vty_create (int vty_sock, union sockunion *su)
1705 {
1706   char buf[SU_ADDRSTRLEN];
1707   struct vty *vty;
1708
1709   sockunion2str(su, buf, SU_ADDRSTRLEN);
1710
1711   /* Allocate new vty structure and set up default values. */
1712   vty = vty_new_init (vty_sock);
1713
1714   /* configurable parameters not part of basic init */
1715   vty->v_timeout = vty_timeout_val;
1716   strcpy (vty->address, buf);
1717   if (no_password_check)
1718     {
1719       if (host.advanced)
1720         vty->node = ENABLE_NODE;
1721       else
1722         vty->node = VIEW_NODE;
1723     }
1724   if (host.lines >= 0)
1725     vty->lines = host.lines;
1726
1727   if (! no_password_check)
1728     {
1729       /* Vty is not available if password isn't set. */
1730       if (host.password == NULL && host.password_encrypt == NULL)
1731         {
1732           vty_out (vty, "Vty password is not set.%s", VTY_NEWLINE);
1733           vty->status = VTY_CLOSE;
1734           vty_close (vty);
1735           return NULL;
1736         }
1737     }
1738
1739   /* Say hello to the world. */
1740   vty_hello (vty);
1741   if (! no_password_check)
1742     vty_out (vty, "%sUser Access Verification%s%s", VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE);
1743
1744   /* Setting up terminal. */
1745   vty_will_echo (vty);
1746   vty_will_suppress_go_ahead (vty);
1747
1748   vty_dont_linemode (vty);
1749   vty_do_window_size (vty);
1750   /* vty_dont_lflow_ahead (vty); */
1751
1752   vty_prompt (vty);
1753
1754   /* Add read/write thread. */
1755   vty_event (VTY_WRITE, vty_sock, vty);
1756   vty_event (VTY_READ, vty_sock, vty);
1757
1758   return vty;
1759 }
1760
1761 /* create vty for stdio */
1762 static struct termios stdio_orig_termios;
1763 static struct vty *stdio_vty = NULL;
1764 static void (*stdio_vty_atclose)(void);
1765
1766 static void
1767 vty_stdio_reset (void)
1768 {
1769   if (stdio_vty)
1770     {
1771       tcsetattr (0, TCSANOW, &stdio_orig_termios);
1772       stdio_vty = NULL;
1773
1774       if (stdio_vty_atclose)
1775         stdio_vty_atclose ();
1776       stdio_vty_atclose = NULL;
1777     }
1778 }
1779
1780 struct vty *
1781 vty_stdio (void (*atclose)())
1782 {
1783   struct vty *vty;
1784   struct termios termios;
1785
1786   /* refuse creating two vtys on stdio */
1787   if (stdio_vty)
1788     return NULL;
1789
1790   vty = stdio_vty = vty_new_init (0);
1791   stdio_vty_atclose = atclose;
1792   vty->wfd = 1;
1793
1794   /* always have stdio vty in a known _unchangeable_ state, don't want config
1795    * to have any effect here to make sure scripting this works as intended */
1796   vty->node = ENABLE_NODE;
1797   vty->v_timeout = 0;
1798   strcpy (vty->address, "console");
1799
1800   if (!tcgetattr (0, &stdio_orig_termios))
1801     {
1802       termios = stdio_orig_termios;
1803       termios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
1804                            | INLCR | IGNCR | ICRNL | IXON);
1805       termios.c_oflag &= ~OPOST;
1806       termios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
1807       termios.c_cflag &= ~(CSIZE | PARENB);
1808       termios.c_cflag |= CS8;
1809       tcsetattr (0, TCSANOW, &termios);
1810     }
1811
1812   vty_prompt (vty);
1813
1814   /* Add read/write thread. */
1815   vty_event (VTY_WRITE, 1, vty);
1816   vty_event (VTY_READ, 0, vty);
1817
1818   return vty;
1819 }
1820
1821 /* Accept connection from the network. */
1822 static int
1823 vty_accept (struct thread *thread)
1824 {
1825   int vty_sock;
1826   union sockunion su;
1827   int ret;
1828   unsigned int on;
1829   int accept_sock;
1830   struct prefix p;
1831   struct access_list *acl = NULL;
1832   char buf[SU_ADDRSTRLEN];
1833
1834   accept_sock = THREAD_FD (thread);
1835
1836   /* We continue hearing vty socket. */
1837   vty_event (VTY_SERV, accept_sock, NULL);
1838
1839   memset (&su, 0, sizeof (union sockunion));
1840
1841   /* We can handle IPv4 or IPv6 socket. */
1842   vty_sock = sockunion_accept (accept_sock, &su);
1843   if (vty_sock < 0)
1844     {
1845       zlog_warn ("can't accept vty socket : %s", safe_strerror (errno));
1846       return -1;
1847     }
1848   set_nonblocking(vty_sock);
1849   set_cloexec(vty_sock);
1850
1851   sockunion2hostprefix (&su, &p);
1852
1853   /* VTY's accesslist apply. */
1854   if (p.family == AF_INET && vty_accesslist_name)
1855     {
1856       if ((acl = access_list_lookup (AFI_IP, vty_accesslist_name)) &&
1857           (access_list_apply (acl, &p) == FILTER_DENY))
1858         {
1859           zlog (NULL, LOG_INFO, "Vty connection refused from %s",
1860                 sockunion2str (&su, buf, SU_ADDRSTRLEN));
1861           close (vty_sock);
1862
1863           /* continue accepting connections */
1864           vty_event (VTY_SERV, accept_sock, NULL);
1865
1866           return 0;
1867         }
1868     }
1869
1870   /* VTY's ipv6 accesslist apply. */
1871   if (p.family == AF_INET6 && vty_ipv6_accesslist_name)
1872     {
1873       if ((acl = access_list_lookup (AFI_IP6, vty_ipv6_accesslist_name)) &&
1874           (access_list_apply (acl, &p) == FILTER_DENY))
1875         {
1876           zlog (NULL, LOG_INFO, "Vty connection refused from %s",
1877                 sockunion2str (&su, buf, SU_ADDRSTRLEN));
1878           close (vty_sock);
1879
1880           /* continue accepting connections */
1881           vty_event (VTY_SERV, accept_sock, NULL);
1882
1883           return 0;
1884         }
1885     }
1886
1887   on = 1;
1888   ret = setsockopt (vty_sock, IPPROTO_TCP, TCP_NODELAY,
1889                     (char *) &on, sizeof (on));
1890   if (ret < 0)
1891     zlog (NULL, LOG_INFO, "can't set sockopt to vty_sock : %s",
1892           safe_strerror (errno));
1893
1894   zlog (NULL, LOG_INFO, "Vty connection from %s",
1895         sockunion2str (&su, buf, SU_ADDRSTRLEN));
1896
1897   vty_create (vty_sock, &su);
1898
1899   return 0;
1900 }
1901
1902 static void
1903 vty_serv_sock_addrinfo (const char *hostname, unsigned short port)
1904 {
1905   int ret;
1906   struct addrinfo req;
1907   struct addrinfo *ainfo;
1908   struct addrinfo *ainfo_save;
1909   int sock;
1910   char port_str[BUFSIZ];
1911
1912   memset (&req, 0, sizeof (struct addrinfo));
1913   req.ai_flags = AI_PASSIVE;
1914   req.ai_family = AF_UNSPEC;
1915   req.ai_socktype = SOCK_STREAM;
1916   sprintf (port_str, "%d", port);
1917   port_str[sizeof (port_str) - 1] = '\0';
1918
1919   ret = getaddrinfo (hostname, port_str, &req, &ainfo);
1920
1921   if (ret != 0)
1922     {
1923       fprintf (stderr, "getaddrinfo failed: %s\n", gai_strerror (ret));
1924       exit (1);
1925     }
1926
1927   ainfo_save = ainfo;
1928
1929   do
1930     {
1931       if (ainfo->ai_family != AF_INET
1932           && ainfo->ai_family != AF_INET6
1933           )
1934         continue;
1935
1936       sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol);
1937       if (sock < 0)
1938         continue;
1939
1940       sockopt_v6only (ainfo->ai_family, sock);
1941       sockopt_reuseaddr (sock);
1942       sockopt_reuseport (sock);
1943       set_cloexec (sock);
1944
1945       ret = bind (sock, ainfo->ai_addr, ainfo->ai_addrlen);
1946       if (ret < 0)
1947         {
1948           close (sock); /* Avoid sd leak. */
1949         continue;
1950         }
1951
1952       ret = listen (sock, 3);
1953       if (ret < 0)
1954         {
1955           close (sock); /* Avoid sd leak. */
1956         continue;
1957         }
1958
1959       vty_event (VTY_SERV, sock, NULL);
1960     }
1961   while ((ainfo = ainfo->ai_next) != NULL);
1962
1963   freeaddrinfo (ainfo_save);
1964 }
1965
1966 #ifdef VTYSH
1967 /* For sockaddr_un. */
1968 #include <sys/un.h>
1969
1970 /* VTY shell UNIX domain socket. */
1971 static void
1972 vty_serv_un (const char *path)
1973 {
1974   int ret;
1975   int sock, len;
1976   struct sockaddr_un serv;
1977   mode_t old_mask;
1978   struct zprivs_ids_t ids;
1979
1980   /* First of all, unlink existing socket */
1981   unlink (path);
1982
1983   /* Set umask */
1984   old_mask = umask (0007);
1985
1986   /* Make UNIX domain socket. */
1987   sock = socket (AF_UNIX, SOCK_STREAM, 0);
1988   if (sock < 0)
1989     {
1990       zlog_err("Cannot create unix stream socket: %s", safe_strerror(errno));
1991       return;
1992     }
1993
1994   /* Make server socket. */
1995   memset (&serv, 0, sizeof (struct sockaddr_un));
1996   serv.sun_family = AF_UNIX;
1997   strlcpy (serv.sun_path, path, sizeof (serv.sun_path));
1998 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
1999   len = serv.sun_len = SUN_LEN(&serv);
2000 #else
2001   len = sizeof (serv.sun_family) + strlen (serv.sun_path);
2002 #endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */
2003
2004   set_cloexec (sock);
2005
2006   ret = bind (sock, (struct sockaddr *) &serv, len);
2007   if (ret < 0)
2008     {
2009       zlog_err("Cannot bind path %s: %s", path, safe_strerror(errno));
2010       close (sock);     /* Avoid sd leak. */
2011       return;
2012     }
2013
2014   ret = listen (sock, 5);
2015   if (ret < 0)
2016     {
2017       zlog_err("listen(fd %d) failed: %s", sock, safe_strerror(errno));
2018       close (sock);     /* Avoid sd leak. */
2019       return;
2020     }
2021
2022   umask (old_mask);
2023
2024   zprivs_get_ids(&ids);
2025
2026   /* Hack: ids.gid_vty is actually a uint, but we stored -1 in it
2027      earlier for the case when we don't need to chown the file
2028      type casting it here to make a compare */
2029   if ((int)ids.gid_vty > 0)
2030     {
2031       /* set group of socket */
2032       if ( chown (path, -1, ids.gid_vty) )
2033         {
2034           zlog_err ("vty_serv_un: could chown socket, %s",
2035                      safe_strerror (errno) );
2036         }
2037     }
2038
2039   vty_event (VTYSH_SERV, sock, NULL);
2040 }
2041
2042 /* #define VTYSH_DEBUG 1 */
2043
2044 static int
2045 vtysh_accept (struct thread *thread)
2046 {
2047   int accept_sock;
2048   int sock;
2049   int client_len;
2050   struct sockaddr_un client;
2051   struct vty *vty;
2052
2053   accept_sock = THREAD_FD (thread);
2054
2055   vty_event (VTYSH_SERV, accept_sock, NULL);
2056
2057   memset (&client, 0, sizeof (struct sockaddr_un));
2058   client_len = sizeof (struct sockaddr_un);
2059
2060   sock = accept (accept_sock, (struct sockaddr *) &client,
2061                  (socklen_t *) &client_len);
2062
2063   if (sock < 0)
2064     {
2065       zlog_warn ("can't accept vty socket : %s", safe_strerror (errno));
2066       return -1;
2067     }
2068
2069   if (set_nonblocking(sock) < 0)
2070     {
2071       zlog_warn ("vtysh_accept: could not set vty socket %d to non-blocking,"
2072                  " %s, closing", sock, safe_strerror (errno));
2073       close (sock);
2074       return -1;
2075     }
2076   set_cloexec(sock);
2077
2078 #ifdef VTYSH_DEBUG
2079   printf ("VTY shell accept\n");
2080 #endif /* VTYSH_DEBUG */
2081
2082   vty = vty_new ();
2083   vty->fd = sock;
2084   vty->wfd = sock;
2085   vty->type = VTY_SHELL_SERV;
2086   vty->node = VIEW_NODE;
2087
2088   vty_event (VTYSH_READ, sock, vty);
2089
2090   return 0;
2091 }
2092
2093 static int
2094 vtysh_flush(struct vty *vty)
2095 {
2096   switch (buffer_flush_available(vty->obuf, vty->wfd))
2097     {
2098     case BUFFER_PENDING:
2099       vty_event(VTYSH_WRITE, vty->wfd, vty);
2100       break;
2101     case BUFFER_ERROR:
2102       vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
2103       zlog_warn("%s: write error to fd %d, closing", __func__, vty->fd);
2104       buffer_reset(vty->obuf);
2105       vty_close(vty);
2106       return -1;
2107       break;
2108     case BUFFER_EMPTY:
2109       break;
2110     }
2111   return 0;
2112 }
2113
2114 static int
2115 vtysh_read (struct thread *thread)
2116 {
2117   int ret;
2118   int sock;
2119   int nbytes;
2120   struct vty *vty;
2121   unsigned char buf[VTY_READ_BUFSIZ];
2122   unsigned char *p;
2123   u_char header[4] = {0, 0, 0, 0};
2124
2125   sock = THREAD_FD (thread);
2126   vty = THREAD_ARG (thread);
2127   vty->t_read = NULL;
2128
2129   if ((nbytes = read (sock, buf, VTY_READ_BUFSIZ)) <= 0)
2130     {
2131       if (nbytes < 0)
2132         {
2133           if (ERRNO_IO_RETRY(errno))
2134             {
2135               vty_event (VTYSH_READ, sock, vty);
2136               return 0;
2137             }
2138           vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
2139           zlog_warn("%s: read failed on vtysh client fd %d, closing: %s",
2140                     __func__, sock, safe_strerror(errno));
2141         }
2142       buffer_reset(vty->obuf);
2143       vty_close (vty);
2144 #ifdef VTYSH_DEBUG
2145       printf ("close vtysh\n");
2146 #endif /* VTYSH_DEBUG */
2147       return 0;
2148     }
2149
2150 #ifdef VTYSH_DEBUG
2151   printf ("line: %.*s\n", nbytes, buf);
2152 #endif /* VTYSH_DEBUG */
2153
2154   if (vty->length + nbytes >= VTY_BUFSIZ)
2155     {
2156       /* Clear command line buffer. */
2157       vty->cp = vty->length = 0;
2158       vty_clear_buf (vty);
2159       vty_out (vty, "%% Command is too long.%s", VTY_NEWLINE);
2160     }
2161   else
2162     {
2163       for (p = buf; p < buf+nbytes; p++)
2164         {
2165           vty->buf[vty->length++] = *p;
2166           if (*p == '\0')
2167             {
2168               /* Pass this line to parser. */
2169               ret = vty_execute (vty);
2170               /* Note that vty_execute clears the command buffer and resets
2171                  vty->length to 0. */
2172
2173               /* Return result. */
2174 #ifdef VTYSH_DEBUG
2175               printf ("result: %d\n", ret);
2176               printf ("vtysh node: %d\n", vty->node);
2177 #endif /* VTYSH_DEBUG */
2178
2179               /* hack for asynchronous "write integrated"
2180                * - other commands in "buf" will be ditched
2181                * - input during pending config-write is "unsupported" */
2182               if (ret == CMD_SUSPEND)
2183                 break;
2184
2185               /* warning: watchquagga hardcodes this result write */
2186               header[3] = ret;
2187               buffer_put(vty->obuf, header, 4);
2188
2189               if (!vty->t_write && (vtysh_flush(vty) < 0))
2190                 /* Try to flush results; exit if a write error occurs. */
2191                 return 0;
2192             }
2193         }
2194     }
2195
2196   vty_event (VTYSH_READ, sock, vty);
2197
2198   return 0;
2199 }
2200
2201 static int
2202 vtysh_write (struct thread *thread)
2203 {
2204   struct vty *vty = THREAD_ARG (thread);
2205
2206   vty->t_write = NULL;
2207   vtysh_flush(vty);
2208   return 0;
2209 }
2210
2211 #endif /* VTYSH */
2212
2213 /* Determine address family to bind. */
2214 void
2215 vty_serv_sock (const char *addr, unsigned short port, const char *path)
2216 {
2217   /* If port is set to 0, do not listen on TCP/IP at all! */
2218   if (port)
2219     vty_serv_sock_addrinfo (addr, port);
2220
2221 #ifdef VTYSH
2222   vty_serv_un (path);
2223 #endif /* VTYSH */
2224 }
2225
2226 /* Close vty interface.  Warning: call this only from functions that
2227    will be careful not to access the vty afterwards (since it has
2228    now been freed).  This is safest from top-level functions (called
2229    directly by the thread dispatcher). */
2230 void
2231 vty_close (struct vty *vty)
2232 {
2233   int i;
2234   bool was_stdio = false;
2235
2236   /* Cancel threads.*/
2237   if (vty->t_read)
2238     thread_cancel (vty->t_read);
2239   if (vty->t_write)
2240     thread_cancel (vty->t_write);
2241   if (vty->t_timeout)
2242     thread_cancel (vty->t_timeout);
2243
2244   /* Flush buffer. */
2245   buffer_flush_all (vty->obuf, vty->wfd);
2246
2247   /* Free input buffer. */
2248   buffer_free (vty->obuf);
2249
2250   /* Free command history. */
2251   for (i = 0; i < VTY_MAXHIST; i++)
2252     if (vty->hist[i])
2253       XFREE (MTYPE_VTY_HIST, vty->hist[i]);
2254
2255   /* Unset vector. */
2256   vector_unset (vtyvec, vty->fd);
2257
2258   if (vty->wfd > 0 && vty->type == VTY_FILE)
2259     fsync (vty->wfd);
2260
2261   /* Close socket. */
2262   if (vty->fd > 0)
2263     {
2264       close (vty->fd);
2265       if (vty->wfd > 0 && vty->wfd != vty->fd)
2266         close (vty->wfd);
2267     }
2268   else
2269     was_stdio = true;
2270
2271   if (vty->buf)
2272     XFREE (MTYPE_VTY, vty->buf);
2273
2274   if (vty->error_buf)
2275     XFREE (MTYPE_VTY, vty->error_buf);
2276
2277   /* Check configure. */
2278   vty_config_unlock (vty);
2279
2280   /* OK free vty. */
2281   XFREE (MTYPE_VTY, vty);
2282
2283   if (was_stdio)
2284     vty_stdio_reset ();
2285 }
2286
2287 /* When time out occur output message then close connection. */
2288 static int
2289 vty_timeout (struct thread *thread)
2290 {
2291   struct vty *vty;
2292
2293   vty = THREAD_ARG (thread);
2294   vty->t_timeout = NULL;
2295   vty->v_timeout = 0;
2296
2297   /* Clear buffer*/
2298   buffer_reset (vty->obuf);
2299   vty_out (vty, "%sVty connection is timed out.%s", VTY_NEWLINE, VTY_NEWLINE);
2300
2301   /* Close connection. */
2302   vty->status = VTY_CLOSE;
2303   vty_close (vty);
2304
2305   return 0;
2306 }
2307
2308 /* Read up configuration file from file_name. */
2309 static void
2310 vty_read_file (FILE *confp)
2311 {
2312   int ret;
2313   struct vty *vty;
2314   unsigned int line_num = 0;
2315
2316   vty = vty_new ();
2317   vty->wfd = dup(STDERR_FILENO); /* vty_close() will close this */
2318   if (vty->wfd < 0)
2319   {
2320     /* Fine, we couldn't make a new fd. vty_close doesn't close stdout. */
2321     vty->wfd = STDOUT_FILENO;
2322   }
2323   vty->fd = STDIN_FILENO;
2324   vty->type = VTY_FILE;
2325   vty->node = CONFIG_NODE;
2326
2327   /* Execute configuration file */
2328   ret = config_from_file (vty, confp, &line_num);
2329
2330   /* Flush any previous errors before printing messages below */
2331   buffer_flush_all (vty->obuf, vty->fd);
2332
2333   if ( !((ret == CMD_SUCCESS) || (ret == CMD_ERR_NOTHING_TODO)) )
2334     {
2335       const char *message = NULL;
2336       switch (ret)
2337        {
2338          case CMD_ERR_AMBIGUOUS:
2339            message = "*** Error reading config: Ambiguous command.";
2340            break;
2341          case CMD_ERR_NO_MATCH:
2342            message = "*** Error reading config: There is no such command.";
2343            break;
2344        }
2345       fprintf (stderr, "%s\n", message);
2346       zlog_err ("%s", message);
2347       fprintf (stderr, "*** Error occurred processing line %u, below:\n%s\n",
2348                        line_num, vty->error_buf);
2349       zlog_err ("*** Error occurred processing line %u, below:\n%s",
2350                       line_num, vty->error_buf);
2351     }
2352
2353   vty_close (vty);
2354 }
2355
2356 static FILE *
2357 vty_use_backup_config (const char *fullpath)
2358 {
2359   char *fullpath_sav, *fullpath_tmp;
2360   FILE *ret = NULL;
2361   int tmp, sav;
2362   int c;
2363   char buffer[512];
2364
2365   fullpath_sav = malloc (strlen (fullpath) + strlen (CONF_BACKUP_EXT) + 1);
2366   strcpy (fullpath_sav, fullpath);
2367   strcat (fullpath_sav, CONF_BACKUP_EXT);
2368
2369   sav = open (fullpath_sav, O_RDONLY);
2370   if (sav < 0)
2371     {
2372       free (fullpath_sav);
2373       return NULL;
2374     }
2375
2376   fullpath_tmp = malloc (strlen (fullpath) + 8);
2377   sprintf (fullpath_tmp, "%s.XXXXXX", fullpath);
2378
2379   /* Open file to configuration write. */
2380   tmp = mkstemp (fullpath_tmp);
2381   if (tmp < 0)
2382     goto out_close_sav;
2383
2384   if (fchmod (tmp, CONFIGFILE_MASK) != 0)
2385     goto out_close;
2386
2387   while((c = read (sav, buffer, 512)) > 0)
2388     {
2389       if (write (tmp, buffer, c) <= 0)
2390         goto out_close;
2391     }
2392   close (sav);
2393   close (tmp);
2394
2395   if (rename (fullpath_tmp, fullpath) == 0)
2396     ret = fopen (fullpath, "r");
2397   else
2398     unlink (fullpath_tmp);
2399
2400   if (0)
2401     {
2402 out_close:
2403       close (tmp);
2404       unlink (fullpath_tmp);
2405 out_close_sav:
2406       close (sav);
2407     }
2408
2409   free (fullpath_sav);
2410   free (fullpath_tmp);
2411   return ret;
2412 }
2413
2414 /* Read up configuration file from file_name. */
2415 void
2416 vty_read_config (const char *config_file,
2417                  char *config_default_dir)
2418 {
2419   char cwd[MAXPATHLEN];
2420   FILE *confp = NULL;
2421   const char *fullpath;
2422   char *tmp = NULL;
2423
2424   /* If -f flag specified. */
2425   if (config_file != NULL)
2426     {
2427       if (! IS_DIRECTORY_SEP (config_file[0]))
2428         {
2429           if (getcwd (cwd, MAXPATHLEN) == NULL)
2430             {
2431               fprintf (stderr, "Failure to determine Current Working Directory %d!\n", errno);
2432               exit (1);
2433             }
2434           tmp = XMALLOC (MTYPE_TMP,
2435                               strlen (cwd) + strlen (config_file) + 2);
2436           sprintf (tmp, "%s/%s", cwd, config_file);
2437           fullpath = tmp;
2438         }
2439       else
2440         fullpath = config_file;
2441
2442       confp = fopen (fullpath, "r");
2443
2444       if (confp == NULL)
2445         {
2446           fprintf (stderr, "%s: failed to open configuration file %s: %s\n",
2447                    __func__, fullpath, safe_strerror (errno));
2448
2449           confp = vty_use_backup_config (fullpath);
2450           if (confp)
2451             fprintf (stderr, "WARNING: using backup configuration file!\n");
2452           else
2453             {
2454               fprintf (stderr, "can't open configuration file [%s]\n",
2455                        config_file);
2456               exit(1);
2457             }
2458         }
2459     }
2460   else
2461     {
2462
2463       host_config_set (config_default_dir);
2464
2465 #ifdef VTYSH
2466       int ret;
2467       struct stat conf_stat;
2468
2469       /* !!!!PLEASE LEAVE!!!!
2470        * This is NEEDED for use with vtysh -b, or else you can get
2471        * a real configuration food fight with a lot garbage in the
2472        * merged configuration file it creates coming from the per
2473        * daemon configuration files.  This also allows the daemons
2474        * to start if there default configuration file is not
2475        * present or ignore them, as needed when using vtysh -b to
2476        * configure the daemons at boot - MAG
2477        */
2478
2479       /* Stat for vtysh Zebra.conf, if found startup and wait for
2480        * boot configuration
2481        */
2482
2483       if ( strstr(config_default_dir, "vtysh") == NULL)
2484         {
2485           ret = stat (integrate_default, &conf_stat);
2486           if (ret >= 0)
2487             goto tmp_free_and_out;
2488         }
2489 #endif /* VTYSH */
2490       confp = fopen (config_default_dir, "r");
2491       if (confp == NULL)
2492         {
2493           fprintf (stderr, "%s: failed to open configuration file %s: %s\n",
2494                    __func__, config_default_dir, safe_strerror (errno));
2495
2496           confp = vty_use_backup_config (config_default_dir);
2497           if (confp)
2498             {
2499               fprintf (stderr, "WARNING: using backup configuration file!\n");
2500               fullpath = config_default_dir;
2501             }
2502           else
2503             {
2504               fprintf (stderr, "can't open configuration file [%s]\n",
2505                        config_default_dir);
2506               goto tmp_free_and_out;
2507             }
2508         }
2509       else
2510         fullpath = config_default_dir;
2511     }
2512
2513   vty_read_file (confp);
2514
2515   fclose (confp);
2516
2517   host_config_set (fullpath);
2518
2519 tmp_free_and_out:
2520   if (tmp)
2521     XFREE (MTYPE_TMP, tmp);
2522 }
2523
2524 /* Small utility function which output log to the VTY. */
2525 void
2526 vty_log (const char *level, const char *proto_str,
2527          const char *format, struct timestamp_control *ctl, va_list va)
2528 {
2529   unsigned int i;
2530   struct vty *vty;
2531
2532   if (!vtyvec)
2533     return;
2534
2535   for (i = 0; i < vector_active (vtyvec); i++)
2536     if ((vty = vector_slot (vtyvec, i)) != NULL)
2537       if (vty->monitor)
2538         {
2539           va_list ac;
2540           va_copy(ac, va);
2541           vty_log_out (vty, level, proto_str, format, ctl, ac);
2542           va_end(ac);
2543         }
2544 }
2545
2546 /* Async-signal-safe version of vty_log for fixed strings. */
2547 void
2548 vty_log_fixed (char *buf, size_t len)
2549 {
2550   unsigned int i;
2551   struct iovec iov[2];
2552   char crlf[4] = "\r\n";
2553
2554   /* vty may not have been initialised */
2555   if (!vtyvec)
2556     return;
2557
2558   iov[0].iov_base = buf;
2559   iov[0].iov_len = len;
2560   iov[1].iov_base = crlf;
2561   iov[1].iov_len = 2;
2562
2563   for (i = 0; i < vector_active (vtyvec); i++)
2564     {
2565       struct vty *vty;
2566       if (((vty = vector_slot (vtyvec, i)) != NULL) && vty->monitor)
2567         /* N.B. We don't care about the return code, since process is
2568            most likely just about to die anyway. */
2569         if (writev(vty->wfd, iov, 2) == -1)
2570           {
2571             fprintf(stderr, "Failure to writev: %d\n", errno);
2572             exit(-1);
2573           }
2574     }
2575 }
2576
2577 int
2578 vty_config_lock (struct vty *vty)
2579 {
2580   if (vty_config_is_lockless)
2581     return 1;
2582   if (vty_config == 0)
2583     {
2584       vty->config = 1;
2585       vty_config = 1;
2586     }
2587   return vty->config;
2588 }
2589
2590 int
2591 vty_config_unlock (struct vty *vty)
2592 {
2593   if (vty_config_is_lockless)
2594     return 0;
2595   if (vty_config == 1 && vty->config == 1)
2596     {
2597       vty->config = 0;
2598       vty_config = 0;
2599     }
2600   return vty->config;
2601 }
2602
2603 void
2604 vty_config_lockless (void)
2605 {
2606   vty_config_is_lockless = 1;
2607 }
2608
2609 /* Master of the threads. */
2610 static struct thread_master *vty_master;
2611
2612 static void
2613 vty_event (enum event event, int sock, struct vty *vty)
2614 {
2615   struct thread *vty_serv_thread;
2616
2617   switch (event)
2618     {
2619     case VTY_SERV:
2620       vty_serv_thread = thread_add_read (vty_master, vty_accept, vty, sock);
2621       vector_set_index (Vvty_serv_thread, sock, vty_serv_thread);
2622       break;
2623 #ifdef VTYSH
2624     case VTYSH_SERV:
2625       vty_serv_thread = thread_add_read (vty_master, vtysh_accept, vty, sock);
2626       vector_set_index (Vvty_serv_thread, sock, vty_serv_thread);
2627       break;
2628     case VTYSH_READ:
2629       vty->t_read = thread_add_read (vty_master, vtysh_read, vty, sock);
2630       break;
2631     case VTYSH_WRITE:
2632       vty->t_write = thread_add_write (vty_master, vtysh_write, vty, sock);
2633       break;
2634 #endif /* VTYSH */
2635     case VTY_READ:
2636       vty->t_read = thread_add_read (vty_master, vty_read, vty, sock);
2637
2638       /* Time out treatment. */
2639       if (vty->v_timeout)
2640         {
2641           if (vty->t_timeout)
2642             thread_cancel (vty->t_timeout);
2643           vty->t_timeout =
2644             thread_add_timer (vty_master, vty_timeout, vty, vty->v_timeout);
2645         }
2646       break;
2647     case VTY_WRITE:
2648       if (! vty->t_write)
2649         vty->t_write = thread_add_write (vty_master, vty_flush, vty, sock);
2650       break;
2651     case VTY_TIMEOUT_RESET:
2652       if (vty->t_timeout)
2653         {
2654           thread_cancel (vty->t_timeout);
2655           vty->t_timeout = NULL;
2656         }
2657       if (vty->v_timeout)
2658         {
2659           vty->t_timeout =
2660             thread_add_timer (vty_master, vty_timeout, vty, vty->v_timeout);
2661         }
2662       break;
2663     }
2664 }
2665
2666 DEFUN (config_who,
2667        config_who_cmd,
2668        "who",
2669        "Display who is on vty\n")
2670 {
2671   unsigned int i;
2672   struct vty *v;
2673
2674   for (i = 0; i < vector_active (vtyvec); i++)
2675     if ((v = vector_slot (vtyvec, i)) != NULL)
2676       vty_out (vty, "%svty[%d] connected from %s.%s",
2677                v->config ? "*" : " ",
2678                i, v->address, VTY_NEWLINE);
2679   return CMD_SUCCESS;
2680 }
2681
2682 /* Move to vty configuration mode. */
2683 DEFUN (line_vty,
2684        line_vty_cmd,
2685        "line vty",
2686        "Configure a terminal line\n"
2687        "Virtual terminal\n")
2688 {
2689   vty->node = VTY_NODE;
2690   return CMD_SUCCESS;
2691 }
2692
2693 /* Set time out value. */
2694 static int
2695 exec_timeout (struct vty *vty, const char *min_str, const char *sec_str)
2696 {
2697   unsigned long timeout = 0;
2698
2699   /* min_str and sec_str are already checked by parser.  So it must be
2700      all digit string. */
2701   if (min_str)
2702     {
2703       timeout = strtol (min_str, NULL, 10);
2704       timeout *= 60;
2705     }
2706   if (sec_str)
2707     timeout += strtol (sec_str, NULL, 10);
2708
2709   vty_timeout_val = timeout;
2710   vty->v_timeout = timeout;
2711   vty_event (VTY_TIMEOUT_RESET, 0, vty);
2712
2713
2714   return CMD_SUCCESS;
2715 }
2716
2717 DEFUN (exec_timeout_min,
2718        exec_timeout_min_cmd,
2719        "exec-timeout (0-35791)",
2720        "Set timeout value\n"
2721        "Timeout value in minutes\n")
2722 {
2723   int idx_number = 1;
2724   return exec_timeout (vty, argv[idx_number]->arg, NULL);
2725 }
2726
2727 DEFUN (exec_timeout_sec,
2728        exec_timeout_sec_cmd,
2729        "exec-timeout (0-35791) (0-2147483)",
2730        "Set the EXEC timeout\n"
2731        "Timeout in minutes\n"
2732        "Timeout in seconds\n")
2733 {
2734   int idx_number = 1;
2735   int idx_number_2 = 2;
2736   return exec_timeout (vty, argv[idx_number]->arg, argv[idx_number_2]->arg);
2737 }
2738
2739 DEFUN (no_exec_timeout,
2740        no_exec_timeout_cmd,
2741        "no exec-timeout",
2742        NO_STR
2743        "Set the EXEC timeout\n")
2744 {
2745   return exec_timeout (vty, NULL, NULL);
2746 }
2747
2748 /* Set vty access class. */
2749 DEFUN (vty_access_class,
2750        vty_access_class_cmd,
2751        "access-class WORD",
2752        "Filter connections based on an IP access list\n"
2753        "IP access list\n")
2754 {
2755   int idx_word = 1;
2756   if (vty_accesslist_name)
2757     XFREE(MTYPE_VTY, vty_accesslist_name);
2758
2759   vty_accesslist_name = XSTRDUP(MTYPE_VTY, argv[idx_word]->arg);
2760
2761   return CMD_SUCCESS;
2762 }
2763
2764 /* Clear vty access class. */
2765 DEFUN (no_vty_access_class,
2766        no_vty_access_class_cmd,
2767        "no access-class [WORD]",
2768        NO_STR
2769        "Filter connections based on an IP access list\n"
2770        "IP access list\n")
2771 {
2772   int idx_word = 2;
2773   const char *accesslist = (argc == 3) ? argv[idx_word]->arg : NULL;
2774   if (! vty_accesslist_name || (argc == 3 && strcmp(vty_accesslist_name, accesslist)))
2775     {
2776       vty_out (vty, "Access-class is not currently applied to vty%s",
2777                VTY_NEWLINE);
2778       return CMD_WARNING;
2779     }
2780
2781   XFREE(MTYPE_VTY, vty_accesslist_name);
2782
2783   vty_accesslist_name = NULL;
2784
2785   return CMD_SUCCESS;
2786 }
2787
2788 /* Set vty access class. */
2789 DEFUN (vty_ipv6_access_class,
2790        vty_ipv6_access_class_cmd,
2791        "ipv6 access-class WORD",
2792        IPV6_STR
2793        "Filter connections based on an IP access list\n"
2794        "IPv6 access list\n")
2795 {
2796   int idx_word = 2;
2797   if (vty_ipv6_accesslist_name)
2798     XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
2799
2800   vty_ipv6_accesslist_name = XSTRDUP(MTYPE_VTY, argv[idx_word]->arg);
2801
2802   return CMD_SUCCESS;
2803 }
2804
2805 /* Clear vty access class. */
2806 DEFUN (no_vty_ipv6_access_class,
2807        no_vty_ipv6_access_class_cmd,
2808        "no ipv6 access-class [WORD]",
2809        NO_STR
2810        IPV6_STR
2811        "Filter connections based on an IP access list\n"
2812        "IPv6 access list\n")
2813 {
2814   int idx_word = 3;
2815   const char *accesslist = (argc == 4) ? argv[idx_word]->arg : NULL;
2816
2817   if (! vty_ipv6_accesslist_name ||
2818       (argc == 4 && strcmp(vty_ipv6_accesslist_name, accesslist)))
2819     {
2820       vty_out (vty, "IPv6 access-class is not currently applied to vty%s",
2821                VTY_NEWLINE);
2822       return CMD_WARNING;
2823     }
2824
2825   XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
2826
2827   vty_ipv6_accesslist_name = NULL;
2828
2829   return CMD_SUCCESS;
2830 }
2831
2832 /* vty login. */
2833 DEFUN (vty_login,
2834        vty_login_cmd,
2835        "login",
2836        "Enable password checking\n")
2837 {
2838   no_password_check = 0;
2839   return CMD_SUCCESS;
2840 }
2841
2842 DEFUN (no_vty_login,
2843        no_vty_login_cmd,
2844        "no login",
2845        NO_STR
2846        "Enable password checking\n")
2847 {
2848   no_password_check = 1;
2849   return CMD_SUCCESS;
2850 }
2851
2852 DEFUN (service_advanced_vty,
2853        service_advanced_vty_cmd,
2854        "service advanced-vty",
2855        "Set up miscellaneous service\n"
2856        "Enable advanced mode vty interface\n")
2857 {
2858   host.advanced = 1;
2859   return CMD_SUCCESS;
2860 }
2861
2862 DEFUN (no_service_advanced_vty,
2863        no_service_advanced_vty_cmd,
2864        "no service advanced-vty",
2865        NO_STR
2866        "Set up miscellaneous service\n"
2867        "Enable advanced mode vty interface\n")
2868 {
2869   host.advanced = 0;
2870   return CMD_SUCCESS;
2871 }
2872
2873 DEFUN (terminal_monitor,
2874        terminal_monitor_cmd,
2875        "terminal monitor",
2876        "Set terminal line parameters\n"
2877        "Copy debug output to the current terminal line\n")
2878 {
2879   vty->monitor = 1;
2880   return CMD_SUCCESS;
2881 }
2882
2883 DEFUN (terminal_no_monitor,
2884        terminal_no_monitor_cmd,
2885        "terminal no monitor",
2886        "Set terminal line parameters\n"
2887        NO_STR
2888        "Copy debug output to the current terminal line\n")
2889 {
2890   vty->monitor = 0;
2891   return CMD_SUCCESS;
2892 }
2893
2894 DEFUN (no_terminal_monitor,
2895        no_terminal_monitor_cmd,
2896        "no terminal monitor",
2897        NO_STR
2898        "Set terminal line parameters\n"
2899        "Copy debug output to the current terminal line\n")
2900 {
2901   return terminal_no_monitor (self, vty, argc, argv);
2902 }
2903
2904
2905 DEFUN (show_history,
2906        show_history_cmd,
2907        "show history",
2908        SHOW_STR
2909        "Display the session command history\n")
2910 {
2911   int index;
2912
2913   for (index = vty->hindex + 1; index != vty->hindex;)
2914     {
2915       if (index == VTY_MAXHIST)
2916         {
2917           index = 0;
2918           continue;
2919         }
2920
2921       if (vty->hist[index] != NULL)
2922         vty_out (vty, "  %s%s", vty->hist[index], VTY_NEWLINE);
2923
2924       index++;
2925     }
2926
2927   return CMD_SUCCESS;
2928 }
2929
2930 /* vty login. */
2931 DEFUN (log_commands,
2932        log_commands_cmd,
2933        "log commands",
2934        "Logging control\n"
2935        "Log all commands (can't be unset without restart)\n")
2936 {
2937   do_log_commands = 1;
2938   return CMD_SUCCESS;
2939 }
2940
2941 /* Display current configuration. */
2942 static int
2943 vty_config_write (struct vty *vty)
2944 {
2945   vty_out (vty, "line vty%s", VTY_NEWLINE);
2946
2947   if (vty_accesslist_name)
2948     vty_out (vty, " access-class %s%s",
2949              vty_accesslist_name, VTY_NEWLINE);
2950
2951   if (vty_ipv6_accesslist_name)
2952     vty_out (vty, " ipv6 access-class %s%s",
2953              vty_ipv6_accesslist_name, VTY_NEWLINE);
2954
2955   /* exec-timeout */
2956   if (vty_timeout_val != VTY_TIMEOUT_DEFAULT)
2957     vty_out (vty, " exec-timeout %ld %ld%s",
2958              vty_timeout_val / 60,
2959              vty_timeout_val % 60, VTY_NEWLINE);
2960
2961   /* login */
2962   if (no_password_check)
2963     vty_out (vty, " no login%s", VTY_NEWLINE);
2964
2965   if (do_log_commands)
2966     vty_out (vty, "log commands%s", VTY_NEWLINE);
2967
2968   vty_out (vty, "!%s", VTY_NEWLINE);
2969
2970   return CMD_SUCCESS;
2971 }
2972
2973 struct cmd_node vty_node =
2974 {
2975   VTY_NODE,
2976   "%s(config-line)# ",
2977   1,
2978 };
2979
2980 /* Reset all VTY status. */
2981 void
2982 vty_reset ()
2983 {
2984   unsigned int i;
2985   struct vty *vty;
2986   struct thread *vty_serv_thread;
2987
2988   for (i = 0; i < vector_active (vtyvec); i++)
2989     if ((vty = vector_slot (vtyvec, i)) != NULL)
2990       {
2991         buffer_reset (vty->obuf);
2992         vty->status = VTY_CLOSE;
2993         vty_close (vty);
2994       }
2995
2996   for (i = 0; i < vector_active (Vvty_serv_thread); i++)
2997     if ((vty_serv_thread = vector_slot (Vvty_serv_thread, i)) != NULL)
2998       {
2999         thread_cancel (vty_serv_thread);
3000         vector_slot (Vvty_serv_thread, i) = NULL;
3001         close (i);
3002       }
3003
3004   vty_timeout_val = VTY_TIMEOUT_DEFAULT;
3005
3006   if (vty_accesslist_name)
3007     {
3008       XFREE(MTYPE_VTY, vty_accesslist_name);
3009       vty_accesslist_name = NULL;
3010     }
3011
3012   if (vty_ipv6_accesslist_name)
3013     {
3014       XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
3015       vty_ipv6_accesslist_name = NULL;
3016     }
3017 }
3018
3019 static void
3020 vty_save_cwd (void)
3021 {
3022   char cwd[MAXPATHLEN];
3023   char *c;
3024
3025   c = getcwd (cwd, MAXPATHLEN);
3026
3027   if (!c)
3028     {
3029       /*
3030        * At this point if these go wrong, more than likely
3031        * the whole world is coming down around us
3032        * Hence not worrying about it too much.
3033        */
3034       if (!chdir (SYSCONFDIR))
3035         {
3036           fprintf(stderr, "Failure to chdir to %s, errno: %d\n", SYSCONFDIR, errno);
3037           exit(-1);
3038         }
3039       if (getcwd (cwd, MAXPATHLEN) == NULL)
3040         {
3041           fprintf(stderr, "Failure to getcwd, errno: %d\n", errno);
3042           exit(-1);
3043         }
3044     }
3045
3046   vty_cwd = XMALLOC (MTYPE_TMP, strlen (cwd) + 1);
3047   strcpy (vty_cwd, cwd);
3048 }
3049
3050 char *
3051 vty_get_cwd ()
3052 {
3053   return vty_cwd;
3054 }
3055
3056 int
3057 vty_shell (struct vty *vty)
3058 {
3059   return vty->type == VTY_SHELL ? 1 : 0;
3060 }
3061
3062 int
3063 vty_shell_serv (struct vty *vty)
3064 {
3065   return vty->type == VTY_SHELL_SERV ? 1 : 0;
3066 }
3067
3068 void
3069 vty_init_vtysh ()
3070 {
3071   vtyvec = vector_init (VECTOR_MIN_SIZE);
3072 }
3073
3074 /* Install vty's own commands like `who' command. */
3075 void
3076 vty_init (struct thread_master *master_thread)
3077 {
3078   /* For further configuration read, preserve current directory. */
3079   vty_save_cwd ();
3080
3081   vtyvec = vector_init (VECTOR_MIN_SIZE);
3082
3083   vty_master = master_thread;
3084
3085   atexit (vty_stdio_reset);
3086
3087   /* Initilize server thread vector. */
3088   Vvty_serv_thread = vector_init (VECTOR_MIN_SIZE);
3089
3090   /* Install bgp top node. */
3091   install_node (&vty_node, vty_config_write);
3092
3093   install_element (VIEW_NODE, &config_who_cmd);
3094   install_element (VIEW_NODE, &show_history_cmd);
3095   install_element (CONFIG_NODE, &line_vty_cmd);
3096   install_element (CONFIG_NODE, &service_advanced_vty_cmd);
3097   install_element (CONFIG_NODE, &no_service_advanced_vty_cmd);
3098   install_element (CONFIG_NODE, &show_history_cmd);
3099   install_element (CONFIG_NODE, &log_commands_cmd);
3100   install_element (ENABLE_NODE, &terminal_monitor_cmd);
3101   install_element (ENABLE_NODE, &terminal_no_monitor_cmd);
3102   install_element (ENABLE_NODE, &no_terminal_monitor_cmd);
3103
3104   install_default (VTY_NODE);
3105   install_element (VTY_NODE, &exec_timeout_min_cmd);
3106   install_element (VTY_NODE, &exec_timeout_sec_cmd);
3107   install_element (VTY_NODE, &no_exec_timeout_cmd);
3108   install_element (VTY_NODE, &vty_access_class_cmd);
3109   install_element (VTY_NODE, &no_vty_access_class_cmd);
3110   install_element (VTY_NODE, &vty_login_cmd);
3111   install_element (VTY_NODE, &no_vty_login_cmd);
3112   install_element (VTY_NODE, &vty_ipv6_access_class_cmd);
3113   install_element (VTY_NODE, &no_vty_ipv6_access_class_cmd);
3114 }
3115
3116 void
3117 vty_terminate (void)
3118 {
3119   if (vty_cwd)
3120     XFREE (MTYPE_TMP, vty_cwd);
3121
3122   if (vtyvec && Vvty_serv_thread)
3123     {
3124       vty_reset ();
3125       vector_free (vtyvec);
3126       vector_free (Vvty_serv_thread);
3127     }
3128 }
3129
3130 /* Utility functions to get arguments from commands generated
3131    by the xml2cli.pl script. */
3132 const char *
3133 vty_get_arg_value (struct vty_arg *args[], const char *arg)
3134 {
3135   while (*args)
3136     {
3137       if (strcmp ((*args)->name, arg) == 0)
3138         return (*args)->value;
3139       args++;
3140     }
3141   return NULL;
3142 }
3143
3144 struct vty_arg *
3145 vty_get_arg (struct vty_arg *args[], const char *arg)
3146 {
3147   while (*args)
3148     {
3149       if (strcmp ((*args)->name, arg) == 0)
3150         return *args;
3151       args++;
3152     }
3153   return NULL;
3154 }