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 RMAP_NODE:
 754     case OSPF_NODE:
 755     case OSPF6_NODE:
 756     case LDP_NODE:
 757     case LDP_IPV4_NODE:
 758     case LDP_IPV6_NODE:
 759     case LDP_IPV4_IFACE_NODE:
 760     case LDP_IPV6_IFACE_NODE:
 761     case LDP_L2VPN_NODE:
 762     case LDP_PSEUDOWIRE_NODE:
 763     case ISIS_NODE:
 764     case KEYCHAIN_NODE:
 765     case KEYCHAIN_KEY_NODE:
 766     case MASC_NODE:
 767     case PIM_NODE:
 768     case VTY_NODE:
 769       vty_config_unlock (vty);
 770       vty->node = ENABLE_NODE;
 771       break;
 772     default:
 773       /* Unknown node, we have to ignore it. */
 774       break;
 775     }
 776
 777   vty_prompt (vty);
 778   vty->cp = 0;
 779 }
 780
 781 /* Delete a charcter at the current point. */
 782 static void
 783 vty_delete_char (struct vty *vty)
 784 {
 785   int i;
 786   int size;
 787
 788   if (vty->length == 0)
 789     {
 790       vty_down_level (vty);
 791       return;
 792     }
 793
 794   if (vty->cp == vty->length)
 795     return;                     /* completion need here? */
 796
 797   size = vty->length - vty->cp;
 798
 799   vty->length--;
 800   memmove (&vty->buf[vty->cp], &vty->buf[vty->cp + 1], size - 1);
 801   vty->buf[vty->length] = '\0';
 802
 803   if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
 804     return;
 805
 806   vty_write (vty, &vty->buf[vty->cp], size - 1);
 807   vty_write (vty, &telnet_space_char, 1);
 808
 809   for (i = 0; i < size; i++)
 810     vty_write (vty, &telnet_backward_char, 1);
 811 }
 812
 813 /* Delete a character before the point. */
 814 static void
 815 vty_delete_backward_char (struct vty *vty)
 816 {
 817   if (vty->cp == 0)
 818     return;
 819
 820   vty_backward_char (vty);
 821   vty_delete_char (vty);
 822 }
 823
 824 /* Kill rest of line from current point. */
 825 static void
 826 vty_kill_line (struct vty *vty)
 827 {
 828   int i;
 829   int size;
 830
 831   size = vty->length - vty->cp;
 832
 833   if (size == 0)
 834     return;
 835
 836   for (i = 0; i < size; i++)
 837     vty_write (vty, &telnet_space_char, 1);
 838   for (i = 0; i < size; i++)
 839     vty_write (vty, &telnet_backward_char, 1);
 840
 841   memset (&vty->buf[vty->cp], 0, size);
 842   vty->length = vty->cp;
 843 }
 844
 845 /* Kill line from the beginning. */
 846 static void
 847 vty_kill_line_from_beginning (struct vty *vty)
 848 {
 849   vty_beginning_of_line (vty);
 850   vty_kill_line (vty);
 851 }
 852
 853 /* Delete a word before the point. */
 854 static void
 855 vty_forward_kill_word (struct vty *vty)
 856 {
 857   while (vty->cp != vty->length && vty->buf[vty->cp] == ' ')
 858     vty_delete_char (vty);
 859   while (vty->cp != vty->length && vty->buf[vty->cp] != ' ')
 860     vty_delete_char (vty);
 861 }
 862
 863 /* Delete a word before the point. */
 864 static void
 865 vty_backward_kill_word (struct vty *vty)
 866 {
 867   while (vty->cp > 0 && vty->buf[vty->cp - 1] == ' ')
 868     vty_delete_backward_char (vty);
 869   while (vty->cp > 0 && vty->buf[vty->cp - 1] != ' ')
 870     vty_delete_backward_char (vty);
 871 }
 872
 873 /* Transpose chars before or at the point. */
 874 static void
 875 vty_transpose_chars (struct vty *vty)
 876 {
 877   char c1, c2;
 878
 879   /* If length is short or point is near by the beginning of line then
 880      return. */
 881   if (vty->length < 2 || vty->cp < 1)
 882     return;
 883
 884   /* In case of point is located at the end of the line. */
 885   if (vty->cp == vty->length)
 886     {
 887       c1 = vty->buf[vty->cp - 1];
 888       c2 = vty->buf[vty->cp - 2];
 889
 890       vty_backward_char (vty);
 891       vty_backward_char (vty);
 892       vty_self_insert_overwrite (vty, c1);
 893       vty_self_insert_overwrite (vty, c2);
 894     }
 895   else
 896     {
 897       c1 = vty->buf[vty->cp];
 898       c2 = vty->buf[vty->cp - 1];
 899
 900       vty_backward_char (vty);
 901       vty_self_insert_overwrite (vty, c1);
 902       vty_self_insert_overwrite (vty, c2);
 903     }
 904 }
 905
 906 /* Do completion at vty interface. */
 907 static void
 908 vty_complete_command (struct vty *vty)
 909 {
 910   int i;
 911   int ret;
 912   char **matched = NULL;
 913   vector vline;
 914
 915   if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
 916     return;
 917
 918   vline = cmd_make_strvec (vty->buf);
 919   if (vline == NULL)
 920     return;
 921
 922   /* In case of 'help \t'. */
 923   if (isspace ((int) vty->buf[vty->length - 1]))
 924     vector_set (vline, NULL);
 925
 926   matched = cmd_complete_command (vline, vty, &ret);
 927
 928   cmd_free_strvec (vline);
 929
 930   vty_out (vty, "%s", VTY_NEWLINE);
 931   switch (ret)
 932     {
 933     case CMD_ERR_AMBIGUOUS:
 934       vty_out (vty, "%% Ambiguous command.%s", VTY_NEWLINE);
 935       vty_prompt (vty);
 936       vty_redraw_line (vty);
 937       break;
 938     case CMD_ERR_NO_MATCH:
 939       /* vty_out (vty, "%% There is no matched command.%s", VTY_NEWLINE); */
 940       vty_prompt (vty);
 941       vty_redraw_line (vty);
 942       break;
 943     case CMD_COMPLETE_FULL_MATCH:
 944       if (!matched[0])
 945         {
 946           /* 2016-11-28 equinox -- need to debug, SEGV here */
 947           vty_out (vty, "%% CLI BUG: FULL_MATCH with NULL str%s", VTY_NEWLINE);
 948           vty_prompt (vty);
 949           vty_redraw_line (vty);
 950           break;
 951         }
 952       vty_prompt (vty);
 953       vty_redraw_line (vty);
 954       vty_backward_pure_word (vty);
 955       vty_insert_word_overwrite (vty, matched[0]);
 956       vty_self_insert (vty, ' ');
 957       XFREE (MTYPE_TMP, matched[0]);
 958       break;
 959     case CMD_COMPLETE_MATCH:
 960       vty_prompt (vty);
 961       vty_redraw_line (vty);
 962       vty_backward_pure_word (vty);
 963       vty_insert_word_overwrite (vty, matched[0]);
 964       XFREE (MTYPE_TMP, matched[0]);
 965       vector_only_index_free (matched);
 966       return;
 967       break;
 968     case CMD_COMPLETE_LIST_MATCH:
 969       for (i = 0; matched[i] != NULL; i++)
 970         {
 971           if (i != 0 && ((i % 6) == 0))
 972             vty_out (vty, "%s", VTY_NEWLINE);
 973           vty_out (vty, "%-10s ", matched[i]);
 974           XFREE (MTYPE_TMP, matched[i]);
 975         }
 976       vty_out (vty, "%s", VTY_NEWLINE);
 977
 978       vty_prompt (vty);
 979       vty_redraw_line (vty);
 980       break;
 981     case CMD_ERR_NOTHING_TODO:
 982       vty_prompt (vty);
 983       vty_redraw_line (vty);
 984       break;
 985     default:
 986       break;
 987     }
 988   if (matched)
 989     vector_only_index_free (matched);
 990 }
 991
 992 static void
 993 vty_describe_fold (struct vty *vty, int cmd_width,
 994                    unsigned int desc_width, struct cmd_token *token)
 995 {
 996   char *buf;
 997   const char *cmd, *p;
 998   int pos;
 999
1000   cmd = token->text;
1001
1002   if (desc_width <= 0)
1003     {
1004       vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, token->desc, VTY_NEWLINE);
1005       return;
1006     }
1007
1008   buf = XCALLOC (MTYPE_TMP, strlen (token->desc) + 1);
1009
1010   for (p = token->desc; strlen (p) > desc_width; p += pos + 1)
1011     {
1012       for (pos = desc_width; pos > 0; pos--)
1013       if (*(p + pos) == ' ')
1014         break;
1015
1016       if (pos == 0)
1017       break;
1018
1019       strncpy (buf, p, pos);
1020       buf[pos] = '\0';
1021       vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, buf, VTY_NEWLINE);
1022
1023       cmd = "";
1024     }
1025
1026   vty_out (vty, "  %-*s  %s%s", cmd_width, cmd, p, VTY_NEWLINE);
1027
1028   XFREE (MTYPE_TMP, buf);
1029 }
1030
1031 /* Describe matched command function. */
1032 static void
1033 vty_describe_command (struct vty *vty)
1034 {
1035   int ret;
1036   vector vline;
1037   vector describe;
1038   unsigned int i, width, desc_width;
1039   struct cmd_token *token, *token_cr = NULL;
1040
1041   vline = cmd_make_strvec (vty->buf);
1042
1043   /* In case of '> ?'. */
1044   if (vline == NULL)
1045     {
1046       vline = vector_init (1);
1047       vector_set (vline, NULL);
1048     }
1049   else
1050     if (isspace ((int) vty->buf[vty->length - 1]))
1051       vector_set (vline, NULL);
1052
1053   describe = cmd_describe_command (vline, vty, &ret);
1054
1055   vty_out (vty, "%s", VTY_NEWLINE);
1056
1057   /* Ambiguous error. */
1058   switch (ret)
1059     {
1060     case CMD_ERR_AMBIGUOUS:
1061       vty_out (vty, "%% Ambiguous command.%s", VTY_NEWLINE);
1062       goto out;
1063       break;
1064     case CMD_ERR_NO_MATCH:
1065       vty_out (vty, "%% There is no matched command.%s", VTY_NEWLINE);
1066       goto out;
1067       break;
1068     }
1069
1070   /* Get width of command string. */
1071   width = 0;
1072   for (i = 0; i < vector_active (describe); i++)
1073     if ((token = vector_slot (describe, i)) != NULL)
1074       {
1075         unsigned int len;
1076
1077         if (token->text[0] == '\0')
1078           continue;
1079
1080         len = strlen (token->text);
1081
1082         if (width < len)
1083           width = len;
1084       }
1085
1086   /* Get width of description string. */
1087   desc_width = vty->width - (width + 6);
1088
1089   /* Print out description. */
1090   for (i = 0; i < vector_active (describe); i++)
1091     if ((token = vector_slot (describe, i)) != NULL)
1092       {
1093         if (token->text[0] == '\0')
1094           continue;
1095
1096         if (strcmp (token->text, CMD_CR_TEXT) == 0)
1097           {
1098             token_cr = token;
1099             continue;
1100           }
1101
1102         if (!token->desc)
1103           vty_out (vty, "  %-s%s",
1104                    token->text,
1105                    VTY_NEWLINE);
1106         else if (desc_width >= strlen (token->desc))
1107           vty_out (vty, "  %-*s  %s%s", width,
1108                    token->text,
1109                    token->desc, VTY_NEWLINE);
1110         else
1111           vty_describe_fold (vty, width, desc_width, token);
1112
1113 #if 0
1114         vty_out (vty, "  %-*s %s%s", width
1115                  desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
1116                  desc->str ? desc->str : "", VTY_NEWLINE);
1117 #endif /* 0 */
1118       }
1119
1120   if ((token = token_cr))
1121     {
1122       if (!token->desc)
1123         vty_out (vty, "  %-s%s",
1124                  token->text,
1125                  VTY_NEWLINE);
1126       else if (desc_width >= strlen (token->desc))
1127         vty_out (vty, "  %-*s  %s%s", width,
1128                  token->text,
1129                  token->desc, VTY_NEWLINE);
1130       else
1131         vty_describe_fold (vty, width, desc_width, token);
1132     }
1133
1134 out:
1135   cmd_free_strvec (vline);
1136   if (describe)
1137     vector_free (describe);
1138
1139   vty_prompt (vty);
1140   vty_redraw_line (vty);
1141 }
1142
1143 static void
1144 vty_clear_buf (struct vty *vty)
1145 {
1146   memset (vty->buf, 0, vty->max);
1147 }
1148
1149 /* ^C stop current input and do not add command line to the history. */
1150 static void
1151 vty_stop_input (struct vty *vty)
1152 {
1153   vty->cp = vty->length = 0;
1154   vty_clear_buf (vty);
1155   vty_out (vty, "%s", VTY_NEWLINE);
1156
1157   switch (vty->node)
1158     {
1159     case VIEW_NODE:
1160     case ENABLE_NODE:
1161       /* Nothing to do. */
1162       break;
1163     case CONFIG_NODE:
1164     case INTERFACE_NODE:
1165     case ZEBRA_NODE:
1166     case RIP_NODE:
1167     case RIPNG_NODE:
1168     case BGP_NODE:
1169     case RMAP_NODE:
1170     case OSPF_NODE:
1171     case OSPF6_NODE:
1172     case LDP_NODE:
1173     case LDP_IPV4_NODE:
1174     case LDP_IPV6_NODE:
1175     case LDP_IPV4_IFACE_NODE:
1176     case LDP_IPV6_IFACE_NODE:
1177     case LDP_L2VPN_NODE:
1178     case LDP_PSEUDOWIRE_NODE:
1179     case ISIS_NODE:
1180     case KEYCHAIN_NODE:
1181     case KEYCHAIN_KEY_NODE:
1182     case MASC_NODE:
1183     case PIM_NODE:
1184     case VTY_NODE:
1185       vty_config_unlock (vty);
1186       vty->node = ENABLE_NODE;
1187       break;
1188     default:
1189       /* Unknown node, we have to ignore it. */
1190       break;
1191     }
1192   vty_prompt (vty);
1193
1194   /* Set history pointer to the latest one. */
1195   vty->hp = vty->hindex;
1196 }
1197
1198 /* Add current command line to the history buffer. */
1199 static void
1200 vty_hist_add (struct vty *vty)
1201 {
1202   int index;
1203
1204   if (vty->length == 0)
1205     return;
1206
1207   index = vty->hindex ? vty->hindex - 1 : VTY_MAXHIST - 1;
1208
1209   /* Ignore the same string as previous one. */
1210   if (vty->hist[index])
1211     if (strcmp (vty->buf, vty->hist[index]) == 0)
1212       {
1213       vty->hp = vty->hindex;
1214       return;
1215       }
1216
1217   /* Insert history entry. */
1218   if (vty->hist[vty->hindex])
1219     XFREE (MTYPE_VTY_HIST, vty->hist[vty->hindex]);
1220   vty->hist[vty->hindex] = XSTRDUP (MTYPE_VTY_HIST, vty->buf);
1221
1222   /* History index rotation. */
1223   vty->hindex++;
1224   if (vty->hindex == VTY_MAXHIST)
1225     vty->hindex = 0;
1226
1227   vty->hp = vty->hindex;
1228 }
1229
1230 /* #define TELNET_OPTION_DEBUG */
1231
1232 /* Get telnet window size. */
1233 static int
1234 vty_telnet_option (struct vty *vty, unsigned char *buf, int nbytes)
1235 {
1236 #ifdef TELNET_OPTION_DEBUG
1237   int i;
1238
1239   for (i = 0; i < nbytes; i++)
1240     {
1241       switch (buf[i])
1242         {
1243         case IAC:
1244           vty_out (vty, "IAC ");
1245           break;
1246         case WILL:
1247           vty_out (vty, "WILL ");
1248           break;
1249         case WONT:
1250           vty_out (vty, "WONT ");
1251           break;
1252         case DO:
1253           vty_out (vty, "DO ");
1254           break;
1255         case DONT:
1256           vty_out (vty, "DONT ");
1257           break;
1258         case SB:
1259           vty_out (vty, "SB ");
1260           break;
1261         case SE:
1262           vty_out (vty, "SE ");
1263           break;
1264         case TELOPT_ECHO:
1265           vty_out (vty, "TELOPT_ECHO %s", VTY_NEWLINE);
1266           break;
1267         case TELOPT_SGA:
1268           vty_out (vty, "TELOPT_SGA %s", VTY_NEWLINE);
1269           break;
1270         case TELOPT_NAWS:
1271           vty_out (vty, "TELOPT_NAWS %s", VTY_NEWLINE);
1272           break;
1273         default:
1274           vty_out (vty, "%x ", buf[i]);
1275           break;
1276         }
1277     }
1278   vty_out (vty, "%s", VTY_NEWLINE);
1279
1280 #endif /* TELNET_OPTION_DEBUG */
1281
1282   switch (buf[0])
1283     {
1284     case SB:
1285       vty->sb_len = 0;
1286       vty->iac_sb_in_progress = 1;
1287       return 0;
1288       break;
1289     case SE:
1290       {
1291         if (!vty->iac_sb_in_progress)
1292           return 0;
1293
1294         if ((vty->sb_len == 0) || (vty->sb_buf[0] == '\0'))
1295           {
1296             vty->iac_sb_in_progress = 0;
1297             return 0;
1298           }
1299         switch (vty->sb_buf[0])
1300           {
1301           case TELOPT_NAWS:
1302             if (vty->sb_len != TELNET_NAWS_SB_LEN)
1303               zlog_warn("RFC 1073 violation detected: telnet NAWS option "
1304                         "should send %d characters, but we received %lu",
1305                         TELNET_NAWS_SB_LEN, (u_long)vty->sb_len);
1306             else if (sizeof(vty->sb_buf) < TELNET_NAWS_SB_LEN)
1307               zlog_err("Bug detected: sizeof(vty->sb_buf) %lu < %d, "
1308                        "too small to handle the telnet NAWS option",
1309                        (u_long)sizeof(vty->sb_buf), TELNET_NAWS_SB_LEN);
1310             else
1311               {
1312                 vty->width = ((vty->sb_buf[1] << 8)|vty->sb_buf[2]);
1313                 vty->height = ((vty->sb_buf[3] << 8)|vty->sb_buf[4]);
1314 #ifdef TELNET_OPTION_DEBUG
1315                 vty_out(vty, "TELNET NAWS window size negotiation completed: "
1316                               "width %d, height %d%s",
1317                         vty->width, vty->height, VTY_NEWLINE);
1318 #endif
1319               }
1320             break;
1321           }
1322         vty->iac_sb_in_progress = 0;
1323         return 0;
1324         break;
1325       }
1326     default:
1327       break;
1328     }
1329   return 1;
1330 }
1331
1332 /* Execute current command line. */
1333 static int
1334 vty_execute (struct vty *vty)
1335 {
1336   int ret;
1337
1338   ret = CMD_SUCCESS;
1339
1340   switch (vty->node)
1341     {
1342     case AUTH_NODE:
1343     case AUTH_ENABLE_NODE:
1344       vty_auth (vty, vty->buf);
1345       break;
1346     default:
1347       ret = vty_command (vty, vty->buf);
1348       if (vty->type == VTY_TERM)
1349         vty_hist_add (vty);
1350       break;
1351     }
1352
1353   /* Clear command line buffer. */
1354   vty->cp = vty->length = 0;
1355   vty_clear_buf (vty);
1356
1357   if (vty->status != VTY_CLOSE )
1358     vty_prompt (vty);
1359
1360   return ret;
1361 }
1362
1363 #define CONTROL(X)  ((X) - '@')
1364 #define VTY_NORMAL     0
1365 #define VTY_PRE_ESCAPE 1
1366 #define VTY_ESCAPE     2
1367
1368 /* Escape character command map. */
1369 static void
1370 vty_escape_map (unsigned char c, struct vty *vty)
1371 {
1372   switch (c)
1373     {
1374     case ('A'):
1375       vty_previous_line (vty);
1376       break;
1377     case ('B'):
1378       vty_next_line (vty);
1379       break;
1380     case ('C'):
1381       vty_forward_char (vty);
1382       break;
1383     case ('D'):
1384       vty_backward_char (vty);
1385       break;
1386     default:
1387       break;
1388     }
1389
1390   /* Go back to normal mode. */
1391   vty->escape = VTY_NORMAL;
1392 }
1393
1394 /* Quit print out to the buffer. */
1395 static void
1396 vty_buffer_reset (struct vty *vty)
1397 {
1398   buffer_reset (vty->obuf);
1399   vty_prompt (vty);
1400   vty_redraw_line (vty);
1401 }
1402
1403 /* Read data via vty socket. */
1404 static int
1405 vty_read (struct thread *thread)
1406 {
1407   int i;
1408   int nbytes;
1409   unsigned char buf[VTY_READ_BUFSIZ];
1410
1411   int vty_sock = THREAD_FD (thread);
1412   struct vty *vty = THREAD_ARG (thread);
1413   vty->t_read = NULL;
1414
1415   /* Read raw data from socket */
1416   if ((nbytes = read (vty->fd, buf, VTY_READ_BUFSIZ)) <= 0)
1417     {
1418       if (nbytes < 0)
1419         {
1420           if (ERRNO_IO_RETRY(errno))
1421             {
1422               vty_event (VTY_READ, vty_sock, vty);
1423               return 0;
1424             }
1425           vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
1426           zlog_warn("%s: read error on vty client fd %d, closing: %s",
1427                     __func__, vty->fd, safe_strerror(errno));
1428           buffer_reset(vty->obuf);
1429         }
1430       vty->status = VTY_CLOSE;
1431     }
1432
1433   for (i = 0; i < nbytes; i++)
1434     {
1435       if (buf[i] == IAC)
1436         {
1437           if (!vty->iac)
1438             {
1439               vty->iac = 1;
1440               continue;
1441             }
1442           else
1443             {
1444               vty->iac = 0;
1445             }
1446         }
1447
1448       if (vty->iac_sb_in_progress && !vty->iac)
1449         {
1450             if (vty->sb_len < sizeof(vty->sb_buf))
1451               vty->sb_buf[vty->sb_len] = buf[i];
1452             vty->sb_len++;
1453             continue;
1454         }
1455
1456       if (vty->iac)
1457         {
1458           /* In case of telnet command */
1459           int ret = 0;
1460           ret = vty_telnet_option (vty, buf + i, nbytes - i);
1461           vty->iac = 0;
1462           i += ret;
1463           continue;
1464         }
1465
1466
1467       if (vty->status == VTY_MORE)
1468         {
1469           switch (buf[i])
1470             {
1471             case CONTROL('C'):
1472             case 'q':
1473             case 'Q':
1474               vty_buffer_reset (vty);
1475               break;
1476 #if 0 /* More line does not work for "show ip bgp".  */
1477             case '\n':
1478             case '\r':
1479               vty->status = VTY_MORELINE;
1480               break;
1481 #endif
1482             default:
1483               break;
1484             }
1485           continue;
1486         }
1487
1488       /* Escape character. */
1489       if (vty->escape == VTY_ESCAPE)
1490         {
1491           vty_escape_map (buf[i], vty);
1492           continue;
1493         }
1494
1495       /* Pre-escape status. */
1496       if (vty->escape == VTY_PRE_ESCAPE)
1497         {
1498           switch (buf[i])
1499             {
1500             case '[':
1501               vty->escape = VTY_ESCAPE;
1502               break;
1503             case 'b':
1504               vty_backward_word (vty);
1505               vty->escape = VTY_NORMAL;
1506               break;
1507             case 'f':
1508               vty_forward_word (vty);
1509               vty->escape = VTY_NORMAL;
1510               break;
1511             case 'd':
1512               vty_forward_kill_word (vty);
1513               vty->escape = VTY_NORMAL;
1514               break;
1515             case CONTROL('H'):
1516             case 0x7f:
1517               vty_backward_kill_word (vty);
1518               vty->escape = VTY_NORMAL;
1519               break;
1520             default:
1521               vty->escape = VTY_NORMAL;
1522               break;
1523             }
1524           continue;
1525         }
1526
1527       switch (buf[i])
1528         {
1529         case CONTROL('A'):
1530           vty_beginning_of_line (vty);
1531           break;
1532         case CONTROL('B'):
1533           vty_backward_char (vty);
1534           break;
1535         case CONTROL('C'):
1536           vty_stop_input (vty);
1537           break;
1538         case CONTROL('D'):
1539           vty_delete_char (vty);
1540           break;
1541         case CONTROL('E'):
1542           vty_end_of_line (vty);
1543           break;
1544         case CONTROL('F'):
1545           vty_forward_char (vty);
1546           break;
1547         case CONTROL('H'):
1548         case 0x7f:
1549           vty_delete_backward_char (vty);
1550           break;
1551         case CONTROL('K'):
1552           vty_kill_line (vty);
1553           break;
1554         case CONTROL('N'):
1555           vty_next_line (vty);
1556           break;
1557         case CONTROL('P'):
1558           vty_previous_line (vty);
1559           break;
1560         case CONTROL('T'):
1561           vty_transpose_chars (vty);
1562           break;
1563         case CONTROL('U'):
1564           vty_kill_line_from_beginning (vty);
1565           break;
1566         case CONTROL('W'):
1567           vty_backward_kill_word (vty);
1568           break;
1569         case CONTROL('Z'):
1570           vty_end_config (vty);
1571           break;
1572         case '\n':
1573         case '\r':
1574           vty_out (vty, "%s", VTY_NEWLINE);
1575           vty_execute (vty);
1576           break;
1577         case '\t':
1578           vty_complete_command (vty);
1579           break;
1580         case '?':
1581           if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
1582             vty_self_insert (vty, buf[i]);
1583           else
1584             vty_describe_command (vty);
1585           break;
1586         case '\033':
1587           if (i + 1 < nbytes && buf[i + 1] == '[')
1588             {
1589               vty->escape = VTY_ESCAPE;
1590               i++;
1591             }
1592           else
1593             vty->escape = VTY_PRE_ESCAPE;
1594           break;
1595         default:
1596           if (buf[i] > 31 && buf[i] < 127)
1597             vty_self_insert (vty, buf[i]);
1598           break;
1599         }
1600     }
1601
1602   /* Check status. */
1603   if (vty->status == VTY_CLOSE)
1604     vty_close (vty);
1605   else
1606     {
1607       vty_event (VTY_WRITE, vty->wfd, vty);
1608       vty_event (VTY_READ, vty_sock, vty);
1609     }
1610   return 0;
1611 }
1612
1613 /* Flush buffer to the vty. */
1614 static int
1615 vty_flush (struct thread *thread)
1616 {
1617   int erase;
1618   buffer_status_t flushrc;
1619   int vty_sock = THREAD_FD (thread);
1620   struct vty *vty = THREAD_ARG (thread);
1621
1622   vty->t_write = NULL;
1623
1624   /* Tempolary disable read thread. */
1625   if ((vty->lines == 0) && vty->t_read)
1626     {
1627       thread_cancel (vty->t_read);
1628       vty->t_read = NULL;
1629     }
1630
1631   /* Function execution continue. */
1632   erase = ((vty->status == VTY_MORE || vty->status == VTY_MORELINE));
1633
1634   /* N.B. if width is 0, that means we don't know the window size. */
1635   if ((vty->lines == 0) || (vty->width == 0) || (vty->height == 0))
1636     flushrc = buffer_flush_available(vty->obuf, vty_sock);
1637   else if (vty->status == VTY_MORELINE)
1638     flushrc = buffer_flush_window(vty->obuf, vty_sock, vty->width,
1639                                   1, erase, 0);
1640   else
1641     flushrc = buffer_flush_window(vty->obuf, vty_sock, vty->width,
1642                                   vty->lines >= 0 ? vty->lines :
1643                                                     vty->height,
1644                                   erase, 0);
1645   switch (flushrc)
1646     {
1647     case BUFFER_ERROR:
1648       vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
1649       zlog_warn("buffer_flush failed on vty client fd %d, closing",
1650                 vty->fd);
1651       buffer_reset(vty->obuf);
1652       vty_close(vty);
1653       return 0;
1654     case BUFFER_EMPTY:
1655       if (vty->status == VTY_CLOSE)
1656         vty_close (vty);
1657       else
1658         {
1659           vty->status = VTY_NORMAL;
1660           if (vty->lines == 0)
1661             vty_event (VTY_READ, vty_sock, vty);
1662         }
1663       break;
1664     case BUFFER_PENDING:
1665       /* There is more data waiting to be written. */
1666       vty->status = VTY_MORE;
1667       if (vty->lines == 0)
1668         vty_event (VTY_WRITE, vty_sock, vty);
1669       break;
1670     }
1671
1672   return 0;
1673 }
1674
1675 /* allocate and initialise vty */
1676 static struct vty *
1677 vty_new_init (int vty_sock)
1678 {
1679   struct vty *vty;
1680
1681   vty = vty_new ();
1682   vty->fd = vty_sock;
1683   vty->wfd = vty_sock;
1684   vty->type = VTY_TERM;
1685   vty->node = AUTH_NODE;
1686   vty->fail = 0;
1687   vty->cp = 0;
1688   vty_clear_buf (vty);
1689   vty->length = 0;
1690   memset (vty->hist, 0, sizeof (vty->hist));
1691   vty->hp = 0;
1692   vty->hindex = 0;
1693   vector_set_index (vtyvec, vty_sock, vty);
1694   vty->status = VTY_NORMAL;
1695   vty->lines = -1;
1696   vty->iac = 0;
1697   vty->iac_sb_in_progress = 0;
1698   vty->sb_len = 0;
1699
1700   return vty;
1701 }
1702
1703 /* Create new vty structure. */
1704 static struct vty *
1705 vty_create (int vty_sock, union sockunion *su)
1706 {
1707   char buf[SU_ADDRSTRLEN];
1708   struct vty *vty;
1709
1710   sockunion2str(su, buf, SU_ADDRSTRLEN);
1711
1712   /* Allocate new vty structure and set up default values. */
1713   vty = vty_new_init (vty_sock);
1714
1715   /* configurable parameters not part of basic init */
1716   vty->v_timeout = vty_timeout_val;
1717   strcpy (vty->address, buf);
1718   if (no_password_check)
1719     {
1720       if (host.advanced)
1721         vty->node = ENABLE_NODE;
1722       else
1723         vty->node = VIEW_NODE;
1724     }
1725   if (host.lines >= 0)
1726     vty->lines = host.lines;
1727
1728   if (! no_password_check)
1729     {
1730       /* Vty is not available if password isn't set. */
1731       if (host.password == NULL && host.password_encrypt == NULL)
1732         {
1733           vty_out (vty, "Vty password is not set.%s", VTY_NEWLINE);
1734           vty->status = VTY_CLOSE;
1735           vty_close (vty);
1736           return NULL;
1737         }
1738     }
1739
1740   /* Say hello to the world. */
1741   vty_hello (vty);
1742   if (! no_password_check)
1743     vty_out (vty, "%sUser Access Verification%s%s", VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE);
1744
1745   /* Setting up terminal. */
1746   vty_will_echo (vty);
1747   vty_will_suppress_go_ahead (vty);
1748
1749   vty_dont_linemode (vty);
1750   vty_do_window_size (vty);
1751   /* vty_dont_lflow_ahead (vty); */
1752
1753   vty_prompt (vty);
1754
1755   /* Add read/write thread. */
1756   vty_event (VTY_WRITE, vty_sock, vty);
1757   vty_event (VTY_READ, vty_sock, vty);
1758
1759   return vty;
1760 }
1761
1762 /* create vty for stdio */
1763 static struct termios stdio_orig_termios;
1764 static struct vty *stdio_vty = NULL;
1765 static void (*stdio_vty_atclose)(void);
1766
1767 static void
1768 vty_stdio_reset (void)
1769 {
1770   if (stdio_vty)
1771     {
1772       tcsetattr (0, TCSANOW, &stdio_orig_termios);
1773       stdio_vty = NULL;
1774
1775       if (stdio_vty_atclose)
1776         stdio_vty_atclose ();
1777       stdio_vty_atclose = NULL;
1778     }
1779 }
1780
1781 struct vty *
1782 vty_stdio (void (*atclose)())
1783 {
1784   struct vty *vty;
1785   struct termios termios;
1786
1787   /* refuse creating two vtys on stdio */
1788   if (stdio_vty)
1789     return NULL;
1790
1791   vty = stdio_vty = vty_new_init (0);
1792   stdio_vty_atclose = atclose;
1793   vty->wfd = 1;
1794
1795   /* always have stdio vty in a known _unchangeable_ state, don't want config
1796    * to have any effect here to make sure scripting this works as intended */
1797   vty->node = ENABLE_NODE;
1798   vty->v_timeout = 0;
1799   strcpy (vty->address, "console");
1800
1801   if (!tcgetattr (0, &stdio_orig_termios))
1802     {
1803       termios = stdio_orig_termios;
1804       termios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
1805                            | INLCR | IGNCR | ICRNL | IXON);
1806       termios.c_oflag &= ~OPOST;
1807       termios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
1808       termios.c_cflag &= ~(CSIZE | PARENB);
1809       termios.c_cflag |= CS8;
1810       tcsetattr (0, TCSANOW, &termios);
1811     }
1812
1813   vty_prompt (vty);
1814
1815   /* Add read/write thread. */
1816   vty_event (VTY_WRITE, 1, vty);
1817   vty_event (VTY_READ, 0, vty);
1818
1819   return vty;
1820 }
1821
1822 /* Accept connection from the network. */
1823 static int
1824 vty_accept (struct thread *thread)
1825 {
1826   int vty_sock;
1827   union sockunion su;
1828   int ret;
1829   unsigned int on;
1830   int accept_sock;
1831   struct prefix p;
1832   struct access_list *acl = NULL;
1833   char buf[SU_ADDRSTRLEN];
1834
1835   accept_sock = THREAD_FD (thread);
1836
1837   /* We continue hearing vty socket. */
1838   vty_event (VTY_SERV, accept_sock, NULL);
1839
1840   memset (&su, 0, sizeof (union sockunion));
1841
1842   /* We can handle IPv4 or IPv6 socket. */
1843   vty_sock = sockunion_accept (accept_sock, &su);
1844   if (vty_sock < 0)
1845     {
1846       zlog_warn ("can't accept vty socket : %s", safe_strerror (errno));
1847       return -1;
1848     }
1849   set_nonblocking(vty_sock);
1850   set_cloexec(vty_sock);
1851
1852   sockunion2hostprefix (&su, &p);
1853
1854   /* VTY's accesslist apply. */
1855   if (p.family == AF_INET && vty_accesslist_name)
1856     {
1857       if ((acl = access_list_lookup (AFI_IP, vty_accesslist_name)) &&
1858           (access_list_apply (acl, &p) == FILTER_DENY))
1859         {
1860           zlog (NULL, LOG_INFO, "Vty connection refused from %s",
1861                 sockunion2str (&su, buf, SU_ADDRSTRLEN));
1862           close (vty_sock);
1863
1864           /* continue accepting connections */
1865           vty_event (VTY_SERV, accept_sock, NULL);
1866
1867           return 0;
1868         }
1869     }
1870
1871   /* VTY's ipv6 accesslist apply. */
1872   if (p.family == AF_INET6 && vty_ipv6_accesslist_name)
1873     {
1874       if ((acl = access_list_lookup (AFI_IP6, vty_ipv6_accesslist_name)) &&
1875           (access_list_apply (acl, &p) == FILTER_DENY))
1876         {
1877           zlog (NULL, LOG_INFO, "Vty connection refused from %s",
1878                 sockunion2str (&su, buf, SU_ADDRSTRLEN));
1879           close (vty_sock);
1880
1881           /* continue accepting connections */
1882           vty_event (VTY_SERV, accept_sock, NULL);
1883
1884           return 0;
1885         }
1886     }
1887
1888   on = 1;
1889   ret = setsockopt (vty_sock, IPPROTO_TCP, TCP_NODELAY,
1890                     (char *) &on, sizeof (on));
1891   if (ret < 0)
1892     zlog (NULL, LOG_INFO, "can't set sockopt to vty_sock : %s",
1893           safe_strerror (errno));
1894
1895   zlog (NULL, LOG_INFO, "Vty connection from %s",
1896         sockunion2str (&su, buf, SU_ADDRSTRLEN));
1897
1898   vty_create (vty_sock, &su);
1899
1900   return 0;
1901 }
1902
1903 static void
1904 vty_serv_sock_addrinfo (const char *hostname, unsigned short port)
1905 {
1906   int ret;
1907   struct addrinfo req;
1908   struct addrinfo *ainfo;
1909   struct addrinfo *ainfo_save;
1910   int sock;
1911   char port_str[BUFSIZ];
1912
1913   memset (&req, 0, sizeof (struct addrinfo));
1914   req.ai_flags = AI_PASSIVE;
1915   req.ai_family = AF_UNSPEC;
1916   req.ai_socktype = SOCK_STREAM;
1917   sprintf (port_str, "%d", port);
1918   port_str[sizeof (port_str) - 1] = '\0';
1919
1920   ret = getaddrinfo (hostname, port_str, &req, &ainfo);
1921
1922   if (ret != 0)
1923     {
1924       fprintf (stderr, "getaddrinfo failed: %s\n", gai_strerror (ret));
1925       exit (1);
1926     }
1927
1928   ainfo_save = ainfo;
1929
1930   do
1931     {
1932       if (ainfo->ai_family != AF_INET
1933           && ainfo->ai_family != AF_INET6
1934           )
1935         continue;
1936
1937       sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol);
1938       if (sock < 0)
1939         continue;
1940
1941       sockopt_v6only (ainfo->ai_family, sock);
1942       sockopt_reuseaddr (sock);
1943       sockopt_reuseport (sock);
1944       set_cloexec (sock);
1945
1946       ret = bind (sock, ainfo->ai_addr, ainfo->ai_addrlen);
1947       if (ret < 0)
1948         {
1949           close (sock); /* Avoid sd leak. */
1950         continue;
1951         }
1952
1953       ret = listen (sock, 3);
1954       if (ret < 0)
1955         {
1956           close (sock); /* Avoid sd leak. */
1957         continue;
1958         }
1959
1960       vty_event (VTY_SERV, sock, NULL);
1961     }
1962   while ((ainfo = ainfo->ai_next) != NULL);
1963
1964   freeaddrinfo (ainfo_save);
1965 }
1966
1967 #ifdef VTYSH
1968 /* For sockaddr_un. */
1969 #include <sys/un.h>
1970
1971 /* VTY shell UNIX domain socket. */
1972 static void
1973 vty_serv_un (const char *path)
1974 {
1975   int ret;
1976   int sock, len;
1977   struct sockaddr_un serv;
1978   mode_t old_mask;
1979   struct zprivs_ids_t ids;
1980
1981   /* First of all, unlink existing socket */
1982   unlink (path);
1983
1984   /* Set umask */
1985   old_mask = umask (0007);
1986
1987   /* Make UNIX domain socket. */
1988   sock = socket (AF_UNIX, SOCK_STREAM, 0);
1989   if (sock < 0)
1990     {
1991       zlog_err("Cannot create unix stream socket: %s", safe_strerror(errno));
1992       return;
1993     }
1994
1995   /* Make server socket. */
1996   memset (&serv, 0, sizeof (struct sockaddr_un));
1997   serv.sun_family = AF_UNIX;
1998   strncpy (serv.sun_path, path, strlen (path));
1999 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
2000   len = serv.sun_len = SUN_LEN(&serv);
2001 #else
2002   len = sizeof (serv.sun_family) + strlen (serv.sun_path);
2003 #endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */
2004
2005   set_cloexec (sock);
2006
2007   ret = bind (sock, (struct sockaddr *) &serv, len);
2008   if (ret < 0)
2009     {
2010       zlog_err("Cannot bind path %s: %s", path, safe_strerror(errno));
2011       close (sock);     /* Avoid sd leak. */
2012       return;
2013     }
2014
2015   ret = listen (sock, 5);
2016   if (ret < 0)
2017     {
2018       zlog_err("listen(fd %d) failed: %s", sock, safe_strerror(errno));
2019       close (sock);     /* Avoid sd leak. */
2020       return;
2021     }
2022
2023   umask (old_mask);
2024
2025   zprivs_get_ids(&ids);
2026
2027   if (ids.gid_vty > 0)
2028     {
2029       /* set group of socket */
2030       if ( chown (path, -1, ids.gid_vty) )
2031         {
2032           zlog_err ("vty_serv_un: could chown socket, %s",
2033                      safe_strerror (errno) );
2034         }
2035     }
2036
2037   vty_event (VTYSH_SERV, sock, NULL);
2038 }
2039
2040 /* #define VTYSH_DEBUG 1 */
2041
2042 static int
2043 vtysh_accept (struct thread *thread)
2044 {
2045   int accept_sock;
2046   int sock;
2047   int client_len;
2048   struct sockaddr_un client;
2049   struct vty *vty;
2050
2051   accept_sock = THREAD_FD (thread);
2052
2053   vty_event (VTYSH_SERV, accept_sock, NULL);
2054
2055   memset (&client, 0, sizeof (struct sockaddr_un));
2056   client_len = sizeof (struct sockaddr_un);
2057
2058   sock = accept (accept_sock, (struct sockaddr *) &client,
2059                  (socklen_t *) &client_len);
2060
2061   if (sock < 0)
2062     {
2063       zlog_warn ("can't accept vty socket : %s", safe_strerror (errno));
2064       return -1;
2065     }
2066
2067   if (set_nonblocking(sock) < 0)
2068     {
2069       zlog_warn ("vtysh_accept: could not set vty socket %d to non-blocking,"
2070                  " %s, closing", sock, safe_strerror (errno));
2071       close (sock);
2072       return -1;
2073     }
2074   set_cloexec(sock);
2075
2076 #ifdef VTYSH_DEBUG
2077   printf ("VTY shell accept\n");
2078 #endif /* VTYSH_DEBUG */
2079
2080   vty = vty_new ();
2081   vty->fd = sock;
2082   vty->wfd = sock;
2083   vty->type = VTY_SHELL_SERV;
2084   vty->node = VIEW_NODE;
2085
2086   vty_event (VTYSH_READ, sock, vty);
2087
2088   return 0;
2089 }
2090
2091 static int
2092 vtysh_flush(struct vty *vty)
2093 {
2094   switch (buffer_flush_available(vty->obuf, vty->wfd))
2095     {
2096     case BUFFER_PENDING:
2097       vty_event(VTYSH_WRITE, vty->wfd, vty);
2098       break;
2099     case BUFFER_ERROR:
2100       vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
2101       zlog_warn("%s: write error to fd %d, closing", __func__, vty->fd);
2102       buffer_reset(vty->obuf);
2103       vty_close(vty);
2104       return -1;
2105       break;
2106     case BUFFER_EMPTY:
2107       break;
2108     }
2109   return 0;
2110 }
2111
2112 static int
2113 vtysh_read (struct thread *thread)
2114 {
2115   int ret;
2116   int sock;
2117   int nbytes;
2118   struct vty *vty;
2119   unsigned char buf[VTY_READ_BUFSIZ];
2120   unsigned char *p;
2121   u_char header[4] = {0, 0, 0, 0};
2122
2123   sock = THREAD_FD (thread);
2124   vty = THREAD_ARG (thread);
2125   vty->t_read = NULL;
2126
2127   if ((nbytes = read (sock, buf, VTY_READ_BUFSIZ)) <= 0)
2128     {
2129       if (nbytes < 0)
2130         {
2131           if (ERRNO_IO_RETRY(errno))
2132             {
2133               vty_event (VTYSH_READ, sock, vty);
2134               return 0;
2135             }
2136           vty->monitor = 0; /* disable monitoring to avoid infinite recursion */
2137           zlog_warn("%s: read failed on vtysh client fd %d, closing: %s",
2138                     __func__, sock, safe_strerror(errno));
2139         }
2140       buffer_reset(vty->obuf);
2141       vty_close (vty);
2142 #ifdef VTYSH_DEBUG
2143       printf ("close vtysh\n");
2144 #endif /* VTYSH_DEBUG */
2145       return 0;
2146     }
2147
2148 #ifdef VTYSH_DEBUG
2149   printf ("line: %.*s\n", nbytes, buf);
2150 #endif /* VTYSH_DEBUG */
2151
2152   if (vty->length + nbytes >= VTY_BUFSIZ)
2153     {
2154       /* Clear command line buffer. */
2155       vty->cp = vty->length = 0;
2156       vty_clear_buf (vty);
2157       vty_out (vty, "%% Command is too long.%s", VTY_NEWLINE);
2158     }
2159   else
2160     {
2161       for (p = buf; p < buf+nbytes; p++)
2162         {
2163           vty->buf[vty->length++] = *p;
2164           if (*p == '\0')
2165             {
2166               /* Pass this line to parser. */
2167               ret = vty_execute (vty);
2168               /* Note that vty_execute clears the command buffer and resets
2169                  vty->length to 0. */
2170
2171               /* Return result. */
2172 #ifdef VTYSH_DEBUG
2173               printf ("result: %d\n", ret);
2174               printf ("vtysh node: %d\n", vty->node);
2175 #endif /* VTYSH_DEBUG */
2176
2177               /* hack for asynchronous "write integrated"
2178                * - other commands in "buf" will be ditched
2179                * - input during pending config-write is "unsupported" */
2180               if (ret == CMD_SUSPEND)
2181                 break;
2182
2183               /* warning: watchquagga hardcodes this result write */
2184               header[3] = ret;
2185               buffer_put(vty->obuf, header, 4);
2186
2187               if (!vty->t_write && (vtysh_flush(vty) < 0))
2188                 /* Try to flush results; exit if a write error occurs. */
2189                 return 0;
2190             }
2191         }
2192     }
2193
2194   vty_event (VTYSH_READ, sock, vty);
2195
2196   return 0;
2197 }
2198
2199 static int
2200 vtysh_write (struct thread *thread)
2201 {
2202   struct vty *vty = THREAD_ARG (thread);
2203
2204   vty->t_write = NULL;
2205   vtysh_flush(vty);
2206   return 0;
2207 }
2208
2209 #endif /* VTYSH */
2210
2211 /* Determine address family to bind. */
2212 void
2213 vty_serv_sock (const char *addr, unsigned short port, const char *path)
2214 {
2215   /* If port is set to 0, do not listen on TCP/IP at all! */
2216   if (port)
2217     vty_serv_sock_addrinfo (addr, port);
2218
2219 #ifdef VTYSH
2220   vty_serv_un (path);
2221 #endif /* VTYSH */
2222 }
2223
2224 /* Close vty interface.  Warning: call this only from functions that
2225    will be careful not to access the vty afterwards (since it has
2226    now been freed).  This is safest from top-level functions (called
2227    directly by the thread dispatcher). */
2228 void
2229 vty_close (struct vty *vty)
2230 {
2231   int i;
2232
2233   /* Cancel threads.*/
2234   if (vty->t_read)
2235     thread_cancel (vty->t_read);
2236   if (vty->t_write)
2237     thread_cancel (vty->t_write);
2238   if (vty->t_timeout)
2239     thread_cancel (vty->t_timeout);
2240
2241   /* Flush buffer. */
2242   buffer_flush_all (vty->obuf, vty->wfd);
2243
2244   /* Free input buffer. */
2245   buffer_free (vty->obuf);
2246
2247   /* Free command history. */
2248   for (i = 0; i < VTY_MAXHIST; i++)
2249     if (vty->hist[i])
2250       XFREE (MTYPE_VTY_HIST, vty->hist[i]);
2251
2252   /* Unset vector. */
2253   vector_unset (vtyvec, vty->fd);
2254
2255   /* Close socket. */
2256   if (vty->fd > 0)
2257     close (vty->fd);
2258   else
2259     vty_stdio_reset ();
2260
2261   if (vty->buf)
2262     XFREE (MTYPE_VTY, vty->buf);
2263
2264   if (vty->error_buf)
2265     XFREE (MTYPE_VTY, vty->error_buf);
2266
2267   /* Check configure. */
2268   vty_config_unlock (vty);
2269
2270   /* OK free vty. */
2271   XFREE (MTYPE_VTY, vty);
2272 }
2273
2274 /* When time out occur output message then close connection. */
2275 static int
2276 vty_timeout (struct thread *thread)
2277 {
2278   struct vty *vty;
2279
2280   vty = THREAD_ARG (thread);
2281   vty->t_timeout = NULL;
2282   vty->v_timeout = 0;
2283
2284   /* Clear buffer*/
2285   buffer_reset (vty->obuf);
2286   vty_out (vty, "%sVty connection is timed out.%s", VTY_NEWLINE, VTY_NEWLINE);
2287
2288   /* Close connection. */
2289   vty->status = VTY_CLOSE;
2290   vty_close (vty);
2291
2292   return 0;
2293 }
2294
2295 /* Read up configuration file from file_name. */
2296 static void
2297 vty_read_file (FILE *confp)
2298 {
2299   int ret;
2300   struct vty *vty;
2301   unsigned int line_num = 0;
2302
2303   vty = vty_new ();
2304   vty->wfd = dup(STDERR_FILENO); /* vty_close() will close this */
2305   if (vty->wfd < 0)
2306   {
2307     /* Fine, we couldn't make a new fd. vty_close doesn't close stdout. */
2308     vty->wfd = STDOUT_FILENO;
2309   }
2310   vty->fd = STDIN_FILENO;
2311   vty->type = VTY_FILE;
2312   vty->node = CONFIG_NODE;
2313
2314   /* Execute configuration file */
2315   ret = config_from_file (vty, confp, &line_num);
2316
2317   /* Flush any previous errors before printing messages below */
2318   buffer_flush_all (vty->obuf, vty->fd);
2319
2320   if ( !((ret == CMD_SUCCESS) || (ret == CMD_ERR_NOTHING_TODO)) )
2321     {
2322       const char *message = NULL;
2323       switch (ret)
2324        {
2325          case CMD_ERR_AMBIGUOUS:
2326            message = "*** Error reading config: Ambiguous command.";
2327            break;
2328          case CMD_ERR_NO_MATCH:
2329            message = "*** Error reading config: There is no such command.";
2330            break;
2331        }
2332       fprintf (stderr, "%s\n", message);
2333       zlog_err ("%s", message);
2334       fprintf (stderr, "*** Error occurred processing line %u, below:\n%s\n",
2335                        line_num, vty->error_buf);
2336       zlog_err ("*** Error occurred processing line %u, below:\n%s",
2337                       line_num, vty->error_buf);
2338     }
2339
2340   vty_close (vty);
2341 }
2342
2343 static FILE *
2344 vty_use_backup_config (char *fullpath)
2345 {
2346   char *fullpath_sav, *fullpath_tmp;
2347   FILE *ret = NULL;
2348   struct stat buf;
2349   int tmp, sav;
2350   int c;
2351   char buffer[512];
2352
2353   fullpath_sav = malloc (strlen (fullpath) + strlen (CONF_BACKUP_EXT) + 1);
2354   strcpy (fullpath_sav, fullpath);
2355   strcat (fullpath_sav, CONF_BACKUP_EXT);
2356   if (stat (fullpath_sav, &buf) == -1)
2357     {
2358       free (fullpath_sav);
2359       return NULL;
2360     }
2361
2362   fullpath_tmp = malloc (strlen (fullpath) + 8);
2363   sprintf (fullpath_tmp, "%s.XXXXXX", fullpath);
2364
2365   /* Open file to configuration write. */
2366   tmp = mkstemp (fullpath_tmp);
2367   if (tmp < 0)
2368     {
2369       free (fullpath_sav);
2370       free (fullpath_tmp);
2371       return NULL;
2372     }
2373
2374   sav = open (fullpath_sav, O_RDONLY);
2375   if (sav < 0)
2376     {
2377       unlink (fullpath_tmp);
2378       free (fullpath_sav);
2379       free (fullpath_tmp);
2380       return NULL;
2381     }
2382
2383   while((c = read (sav, buffer, 512)) > 0)
2384     {
2385       if (write (tmp, buffer, c) <= 0)
2386         {
2387           free (fullpath_sav);
2388           free (fullpath_tmp);
2389           close (sav);
2390           close (tmp);
2391           return NULL;
2392         }
2393     }
2394   close (sav);
2395   close (tmp);
2396
2397   if (chmod(fullpath_tmp, CONFIGFILE_MASK) != 0)
2398     {
2399       unlink (fullpath_tmp);
2400       free (fullpath_sav);
2401       free (fullpath_tmp);
2402       return NULL;
2403     }
2404
2405   if (link (fullpath_tmp, fullpath) == 0)
2406     ret = fopen (fullpath, "r");
2407
2408   unlink (fullpath_tmp);
2409
2410   free (fullpath_sav);
2411   free (fullpath_tmp);
2412   return ret;
2413 }
2414
2415 /* Read up configuration file from file_name. */
2416 void
2417 vty_read_config (char *config_file,
2418                  char *config_default_dir)
2419 {
2420   char cwd[MAXPATHLEN];
2421   FILE *confp = NULL;
2422   char *fullpath;
2423   char *tmp = NULL;
2424
2425   /* If -f flag specified. */
2426   if (config_file != NULL)
2427     {
2428       if (! IS_DIRECTORY_SEP (config_file[0]))
2429         {
2430           if (getcwd (cwd, MAXPATHLEN) == NULL)
2431             {
2432               fprintf (stderr, "Failure to determine Current Working Directory %d!\n", errno);
2433               exit (1);
2434             }
2435           tmp = XMALLOC (MTYPE_TMP,
2436                               strlen (cwd) + strlen (config_file) + 2);
2437           sprintf (tmp, "%s/%s", cwd, config_file);
2438           fullpath = tmp;
2439         }
2440       else
2441         fullpath = config_file;
2442
2443       confp = fopen (fullpath, "r");
2444
2445       if (confp == NULL)
2446         {
2447           fprintf (stderr, "%s: failed to open configuration file %s: %s\n",
2448                    __func__, fullpath, safe_strerror (errno));
2449
2450           confp = vty_use_backup_config (fullpath);
2451           if (confp)
2452             fprintf (stderr, "WARNING: using backup configuration file!\n");
2453           else
2454             {
2455               fprintf (stderr, "can't open configuration file [%s]\n",
2456                        config_file);
2457               exit(1);
2458             }
2459         }
2460     }
2461   else
2462     {
2463
2464       host_config_set (config_default_dir);
2465
2466 #ifdef VTYSH
2467       int ret;
2468       struct stat conf_stat;
2469
2470       /* !!!!PLEASE LEAVE!!!!
2471        * This is NEEDED for use with vtysh -b, or else you can get
2472        * a real configuration food fight with a lot garbage in the
2473        * merged configuration file it creates coming from the per
2474        * daemon configuration files.  This also allows the daemons
2475        * to start if there default configuration file is not
2476        * present or ignore them, as needed when using vtysh -b to
2477        * configure the daemons at boot - MAG
2478        */
2479
2480       /* Stat for vtysh Zebra.conf, if found startup and wait for
2481        * boot configuration
2482        */
2483
2484       if ( strstr(config_default_dir, "vtysh") == NULL)
2485         {
2486           ret = stat (integrate_default, &conf_stat);
2487           if (ret >= 0)
2488             goto tmp_free_and_out;
2489         }
2490 #endif /* VTYSH */
2491       confp = fopen (config_default_dir, "r");
2492       if (confp == NULL)
2493         {
2494           fprintf (stderr, "%s: failed to open configuration file %s: %s\n",
2495                    __func__, config_default_dir, safe_strerror (errno));
2496
2497           confp = vty_use_backup_config (config_default_dir);
2498           if (confp)
2499             {
2500               fprintf (stderr, "WARNING: using backup configuration file!\n");
2501               fullpath = config_default_dir;
2502             }
2503           else
2504             {
2505               fprintf (stderr, "can't open configuration file [%s]\n",
2506                        config_default_dir);
2507               goto tmp_free_and_out;
2508             }
2509         }
2510       else
2511         fullpath = config_default_dir;
2512     }
2513
2514   vty_read_file (confp);
2515
2516   fclose (confp);
2517
2518   host_config_set (fullpath);
2519
2520 tmp_free_and_out:
2521   if (tmp)
2522     XFREE (MTYPE_TMP, fullpath);
2523 }
2524
2525 /* Small utility function which output log to the VTY. */
2526 void
2527 vty_log (const char *level, const char *proto_str,
2528          const char *format, struct timestamp_control *ctl, va_list va)
2529 {
2530   unsigned int i;
2531   struct vty *vty;
2532
2533   if (!vtyvec)
2534     return;
2535
2536   for (i = 0; i < vector_active (vtyvec); i++)
2537     if ((vty = vector_slot (vtyvec, i)) != NULL)
2538       if (vty->monitor)
2539         {
2540           va_list ac;
2541           va_copy(ac, va);
2542           vty_log_out (vty, level, proto_str, format, ctl, ac);
2543           va_end(ac);
2544         }
2545 }
2546
2547 /* Async-signal-safe version of vty_log for fixed strings. */
2548 void
2549 vty_log_fixed (char *buf, size_t len)
2550 {
2551   unsigned int i;
2552   struct iovec iov[2];
2553   char crlf[4] = "\r\n";
2554
2555   /* vty may not have been initialised */
2556   if (!vtyvec)
2557     return;
2558
2559   iov[0].iov_base = buf;
2560   iov[0].iov_len = len;
2561   iov[1].iov_base = crlf;
2562   iov[1].iov_len = 2;
2563
2564   for (i = 0; i < vector_active (vtyvec); i++)
2565     {
2566       struct vty *vty;
2567       if (((vty = vector_slot (vtyvec, i)) != NULL) && vty->monitor)
2568         /* N.B. We don't care about the return code, since process is
2569            most likely just about to die anyway. */
2570         if (writev(vty->wfd, iov, 2) == -1)
2571           {
2572             fprintf(stderr, "Failure to writev: %d\n", errno);
2573             exit(-1);
2574           }
2575     }
2576 }
2577
2578 int
2579 vty_config_lock (struct vty *vty)
2580 {
2581   if (vty_config_is_lockless)
2582     return 1;
2583   if (vty_config == 0)
2584     {
2585       vty->config = 1;
2586       vty_config = 1;
2587     }
2588   return vty->config;
2589 }
2590
2591 int
2592 vty_config_unlock (struct vty *vty)
2593 {
2594   if (vty_config_is_lockless)
2595     return 0;
2596   if (vty_config == 1 && vty->config == 1)
2597     {
2598       vty->config = 0;
2599       vty_config = 0;
2600     }
2601   return vty->config;
2602 }
2603
2604 void
2605 vty_config_lockless (void)
2606 {
2607   vty_config_is_lockless = 1;
2608 }
2609
2610 /* Master of the threads. */
2611 static struct thread_master *vty_master;
2612
2613 static void
2614 vty_event (enum event event, int sock, struct vty *vty)
2615 {
2616   struct thread *vty_serv_thread;
2617
2618   switch (event)
2619     {
2620     case VTY_SERV:
2621       vty_serv_thread = thread_add_read (vty_master, vty_accept, vty, sock);
2622       vector_set_index (Vvty_serv_thread, sock, vty_serv_thread);
2623       break;
2624 #ifdef VTYSH
2625     case VTYSH_SERV:
2626       vty_serv_thread = thread_add_read (vty_master, vtysh_accept, vty, sock);
2627       vector_set_index (Vvty_serv_thread, sock, vty_serv_thread);
2628       break;
2629     case VTYSH_READ:
2630       vty->t_read = thread_add_read (vty_master, vtysh_read, vty, sock);
2631       break;
2632     case VTYSH_WRITE:
2633       vty->t_write = thread_add_write (vty_master, vtysh_write, vty, sock);
2634       break;
2635 #endif /* VTYSH */
2636     case VTY_READ:
2637       vty->t_read = thread_add_read (vty_master, vty_read, vty, sock);
2638
2639       /* Time out treatment. */
2640       if (vty->v_timeout)
2641         {
2642           if (vty->t_timeout)
2643             thread_cancel (vty->t_timeout);
2644           vty->t_timeout =
2645             thread_add_timer (vty_master, vty_timeout, vty, vty->v_timeout);
2646         }
2647       break;
2648     case VTY_WRITE:
2649       if (! vty->t_write)
2650         vty->t_write = thread_add_write (vty_master, vty_flush, vty, sock);
2651       break;
2652     case VTY_TIMEOUT_RESET:
2653       if (vty->t_timeout)
2654         {
2655           thread_cancel (vty->t_timeout);
2656           vty->t_timeout = NULL;
2657         }
2658       if (vty->v_timeout)
2659         {
2660           vty->t_timeout =
2661             thread_add_timer (vty_master, vty_timeout, vty, vty->v_timeout);
2662         }
2663       break;
2664     }
2665 }
2666
2667 DEFUN (config_who,
2668        config_who_cmd,
2669        "who",
2670        "Display who is on vty\n")
2671 {
2672   unsigned int i;
2673   struct vty *v;
2674
2675   for (i = 0; i < vector_active (vtyvec); i++)
2676     if ((v = vector_slot (vtyvec, i)) != NULL)
2677       vty_out (vty, "%svty[%d] connected from %s.%s",
2678                v->config ? "*" : " ",
2679                i, v->address, VTY_NEWLINE);
2680   return CMD_SUCCESS;
2681 }
2682
2683 /* Move to vty configuration mode. */
2684 DEFUN (line_vty,
2685        line_vty_cmd,
2686        "line vty",
2687        "Configure a terminal line\n"
2688        "Virtual terminal\n")
2689 {
2690   vty->node = VTY_NODE;
2691   return CMD_SUCCESS;
2692 }
2693
2694 /* Set time out value. */
2695 static int
2696 exec_timeout (struct vty *vty, const char *min_str, const char *sec_str)
2697 {
2698   unsigned long timeout = 0;
2699
2700   /* min_str and sec_str are already checked by parser.  So it must be
2701      all digit string. */
2702   if (min_str)
2703     {
2704       timeout = strtol (min_str, NULL, 10);
2705       timeout *= 60;
2706     }
2707   if (sec_str)
2708     timeout += strtol (sec_str, NULL, 10);
2709
2710   vty_timeout_val = timeout;
2711   vty->v_timeout = timeout;
2712   vty_event (VTY_TIMEOUT_RESET, 0, vty);
2713
2714
2715   return CMD_SUCCESS;
2716 }
2717
2718 DEFUN (exec_timeout_min,
2719        exec_timeout_min_cmd,
2720        "exec-timeout (0-35791)",
2721        "Set timeout value\n"
2722        "Timeout value in minutes\n")
2723 {
2724   int idx_number = 1;
2725   return exec_timeout (vty, argv[idx_number]->arg, NULL);
2726 }
2727
2728 DEFUN (exec_timeout_sec,
2729        exec_timeout_sec_cmd,
2730        "exec-timeout (0-35791) (0-2147483)",
2731        "Set the EXEC timeout\n"
2732        "Timeout in minutes\n"
2733        "Timeout in seconds\n")
2734 {
2735   int idx_number = 1;
2736   int idx_number_2 = 2;
2737   return exec_timeout (vty, argv[idx_number]->arg, argv[idx_number_2]->arg);
2738 }
2739
2740 DEFUN (no_exec_timeout,
2741        no_exec_timeout_cmd,
2742        "no exec-timeout",
2743        NO_STR
2744        "Set the EXEC timeout\n")
2745 {
2746   return exec_timeout (vty, NULL, NULL);
2747 }
2748
2749 /* Set vty access class. */
2750 DEFUN (vty_access_class,
2751        vty_access_class_cmd,
2752        "access-class WORD",
2753        "Filter connections based on an IP access list\n"
2754        "IP access list\n")
2755 {
2756   int idx_word = 1;
2757   if (vty_accesslist_name)
2758     XFREE(MTYPE_VTY, vty_accesslist_name);
2759
2760   vty_accesslist_name = XSTRDUP(MTYPE_VTY, argv[idx_word]->arg);
2761
2762   return CMD_SUCCESS;
2763 }
2764
2765 /* Clear vty access class. */
2766 DEFUN (no_vty_access_class,
2767        no_vty_access_class_cmd,
2768        "no access-class [WORD]",
2769        NO_STR
2770        "Filter connections based on an IP access list\n"
2771        "IP access list\n")
2772 {
2773   int idx_word = 2;
2774   const char *accesslist = (argc == 3) ? argv[idx_word]->arg : NULL;
2775   if (! vty_accesslist_name || (argc == 3 && strcmp(vty_accesslist_name, accesslist)))
2776     {
2777       vty_out (vty, "Access-class is not currently applied to vty%s",
2778                VTY_NEWLINE);
2779       return CMD_WARNING;
2780     }
2781
2782   XFREE(MTYPE_VTY, vty_accesslist_name);
2783
2784   vty_accesslist_name = NULL;
2785
2786   return CMD_SUCCESS;
2787 }
2788
2789 /* Set vty access class. */
2790 DEFUN (vty_ipv6_access_class,
2791        vty_ipv6_access_class_cmd,
2792        "ipv6 access-class WORD",
2793        IPV6_STR
2794        "Filter connections based on an IP access list\n"
2795        "IPv6 access list\n")
2796 {
2797   int idx_word = 2;
2798   if (vty_ipv6_accesslist_name)
2799     XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
2800
2801   vty_ipv6_accesslist_name = XSTRDUP(MTYPE_VTY, argv[idx_word]->arg);
2802
2803   return CMD_SUCCESS;
2804 }
2805
2806 /* Clear vty access class. */
2807 DEFUN (no_vty_ipv6_access_class,
2808        no_vty_ipv6_access_class_cmd,
2809        "no ipv6 access-class [WORD]",
2810        NO_STR
2811        IPV6_STR
2812        "Filter connections based on an IP access list\n"
2813        "IPv6 access list\n")
2814 {
2815   int idx_word = 3;
2816   const char *accesslist = (argc == 4) ? argv[idx_word]->arg : NULL;
2817
2818   if (! vty_ipv6_accesslist_name ||
2819       (argc == 4 && strcmp(vty_ipv6_accesslist_name, accesslist)))
2820     {
2821       vty_out (vty, "IPv6 access-class is not currently applied to vty%s",
2822                VTY_NEWLINE);
2823       return CMD_WARNING;
2824     }
2825
2826   XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
2827
2828   vty_ipv6_accesslist_name = NULL;
2829
2830   return CMD_SUCCESS;
2831 }
2832
2833 /* vty login. */
2834 DEFUN (vty_login,
2835        vty_login_cmd,
2836        "login",
2837        "Enable password checking\n")
2838 {
2839   no_password_check = 0;
2840   return CMD_SUCCESS;
2841 }
2842
2843 DEFUN (no_vty_login,
2844        no_vty_login_cmd,
2845        "no login",
2846        NO_STR
2847        "Enable password checking\n")
2848 {
2849   no_password_check = 1;
2850   return CMD_SUCCESS;
2851 }
2852
2853 DEFUN (service_advanced_vty,
2854        service_advanced_vty_cmd,
2855        "service advanced-vty",
2856        "Set up miscellaneous service\n"
2857        "Enable advanced mode vty interface\n")
2858 {
2859   host.advanced = 1;
2860   return CMD_SUCCESS;
2861 }
2862
2863 DEFUN (no_service_advanced_vty,
2864        no_service_advanced_vty_cmd,
2865        "no service advanced-vty",
2866        NO_STR
2867        "Set up miscellaneous service\n"
2868        "Enable advanced mode vty interface\n")
2869 {
2870   host.advanced = 0;
2871   return CMD_SUCCESS;
2872 }
2873
2874 DEFUN (terminal_monitor,
2875        terminal_monitor_cmd,
2876        "terminal monitor",
2877        "Set terminal line parameters\n"
2878        "Copy debug output to the current terminal line\n")
2879 {
2880   vty->monitor = 1;
2881   return CMD_SUCCESS;
2882 }
2883
2884 DEFUN (terminal_no_monitor,
2885        terminal_no_monitor_cmd,
2886        "terminal no monitor",
2887        "Set terminal line parameters\n"
2888        NO_STR
2889        "Copy debug output to the current terminal line\n")
2890 {
2891   vty->monitor = 0;
2892   return CMD_SUCCESS;
2893 }
2894
2895 DEFUN (no_terminal_monitor,
2896        no_terminal_monitor_cmd,
2897        "no terminal monitor",
2898        NO_STR
2899        "Set terminal line parameters\n"
2900        "Copy debug output to the current terminal line\n")
2901 {
2902   return terminal_no_monitor (self, vty, argc, argv);
2903 }
2904
2905
2906 DEFUN (show_history,
2907        show_history_cmd,
2908        "show history",
2909        SHOW_STR
2910        "Display the session command history\n")
2911 {
2912   int index;
2913
2914   for (index = vty->hindex + 1; index != vty->hindex;)
2915     {
2916       if (index == VTY_MAXHIST)
2917         {
2918           index = 0;
2919           continue;
2920         }
2921
2922       if (vty->hist[index] != NULL)
2923         vty_out (vty, "  %s%s", vty->hist[index], VTY_NEWLINE);
2924
2925       index++;
2926     }
2927
2928   return CMD_SUCCESS;
2929 }
2930
2931 /* vty login. */
2932 DEFUN (log_commands,
2933        log_commands_cmd,
2934        "log commands",
2935        "Logging control\n"
2936        "Log all commands (can't be unset without restart)\n")
2937 {
2938   do_log_commands = 1;
2939   return CMD_SUCCESS;
2940 }
2941
2942 /* Display current configuration. */
2943 static int
2944 vty_config_write (struct vty *vty)
2945 {
2946   vty_out (vty, "line vty%s", VTY_NEWLINE);
2947
2948   if (vty_accesslist_name)
2949     vty_out (vty, " access-class %s%s",
2950              vty_accesslist_name, VTY_NEWLINE);
2951
2952   if (vty_ipv6_accesslist_name)
2953     vty_out (vty, " ipv6 access-class %s%s",
2954              vty_ipv6_accesslist_name, VTY_NEWLINE);
2955
2956   /* exec-timeout */
2957   if (vty_timeout_val != VTY_TIMEOUT_DEFAULT)
2958     vty_out (vty, " exec-timeout %ld %ld%s",
2959              vty_timeout_val / 60,
2960              vty_timeout_val % 60, VTY_NEWLINE);
2961
2962   /* login */
2963   if (no_password_check)
2964     vty_out (vty, " no login%s", VTY_NEWLINE);
2965
2966   if (do_log_commands)
2967     vty_out (vty, "log commands%s", VTY_NEWLINE);
2968
2969   vty_out (vty, "!%s", VTY_NEWLINE);
2970
2971   return CMD_SUCCESS;
2972 }
2973
2974 struct cmd_node vty_node =
2975 {
2976   VTY_NODE,
2977   "%s(config-line)# ",
2978   1,
2979 };
2980
2981 /* Reset all VTY status. */
2982 void
2983 vty_reset ()
2984 {
2985   unsigned int i;
2986   struct vty *vty;
2987   struct thread *vty_serv_thread;
2988
2989   for (i = 0; i < vector_active (vtyvec); i++)
2990     if ((vty = vector_slot (vtyvec, i)) != NULL)
2991       {
2992         buffer_reset (vty->obuf);
2993         vty->status = VTY_CLOSE;
2994         vty_close (vty);
2995       }
2996
2997   for (i = 0; i < vector_active (Vvty_serv_thread); i++)
2998     if ((vty_serv_thread = vector_slot (Vvty_serv_thread, i)) != NULL)
2999       {
3000         thread_cancel (vty_serv_thread);
3001         vector_slot (Vvty_serv_thread, i) = NULL;
3002         close (i);
3003       }
3004
3005   vty_timeout_val = VTY_TIMEOUT_DEFAULT;
3006
3007   if (vty_accesslist_name)
3008     {
3009       XFREE(MTYPE_VTY, vty_accesslist_name);
3010       vty_accesslist_name = NULL;
3011     }
3012
3013   if (vty_ipv6_accesslist_name)
3014     {
3015       XFREE(MTYPE_VTY, vty_ipv6_accesslist_name);
3016       vty_ipv6_accesslist_name = NULL;
3017     }
3018 }
3019
3020 static void
3021 vty_save_cwd (void)
3022 {
3023   char cwd[MAXPATHLEN];
3024   char *c;
3025
3026   c = getcwd (cwd, MAXPATHLEN);
3027
3028   if (!c)
3029     {
3030       /*
3031        * At this point if these go wrong, more than likely
3032        * the whole world is coming down around us
3033        * Hence not worrying about it too much.
3034        */
3035       if (!chdir (SYSCONFDIR))
3036         {
3037           fprintf(stderr, "Failure to chdir to %s, errno: %d\n", SYSCONFDIR, errno);
3038           exit(-1);
3039         }
3040       if (getcwd (cwd, MAXPATHLEN) == NULL)
3041         {
3042           fprintf(stderr, "Failure to getcwd, errno: %d\n", errno);
3043           exit(-1);
3044         }
3045     }
3046
3047   vty_cwd = XMALLOC (MTYPE_TMP, strlen (cwd) + 1);
3048   strcpy (vty_cwd, cwd);
3049 }
3050
3051 char *
3052 vty_get_cwd ()
3053 {
3054   return vty_cwd;
3055 }
3056
3057 int
3058 vty_shell (struct vty *vty)
3059 {
3060   return vty->type == VTY_SHELL ? 1 : 0;
3061 }
3062
3063 int
3064 vty_shell_serv (struct vty *vty)
3065 {
3066   return vty->type == VTY_SHELL_SERV ? 1 : 0;
3067 }
3068
3069 void
3070 vty_init_vtysh ()
3071 {
3072   vtyvec = vector_init (VECTOR_MIN_SIZE);
3073 }
3074
3075 /* Install vty's own commands like `who' command. */
3076 void
3077 vty_init (struct thread_master *master_thread)
3078 {
3079   /* For further configuration read, preserve current directory. */
3080   vty_save_cwd ();
3081
3082   vtyvec = vector_init (VECTOR_MIN_SIZE);
3083
3084   vty_master = master_thread;
3085
3086   atexit (vty_stdio_reset);
3087
3088   /* Initilize server thread vector. */
3089   Vvty_serv_thread = vector_init (VECTOR_MIN_SIZE);
3090
3091   /* Install bgp top node. */
3092   install_node (&vty_node, vty_config_write);
3093
3094   install_element (VIEW_NODE, &config_who_cmd);
3095   install_element (VIEW_NODE, &show_history_cmd);
3096   install_element (CONFIG_NODE, &line_vty_cmd);
3097   install_element (CONFIG_NODE, &service_advanced_vty_cmd);
3098   install_element (CONFIG_NODE, &no_service_advanced_vty_cmd);
3099   install_element (CONFIG_NODE, &show_history_cmd);
3100   install_element (CONFIG_NODE, &log_commands_cmd);
3101   install_element (ENABLE_NODE, &terminal_monitor_cmd);
3102   install_element (ENABLE_NODE, &terminal_no_monitor_cmd);
3103   install_element (ENABLE_NODE, &no_terminal_monitor_cmd);
3104
3105   install_default (VTY_NODE);
3106   install_element (VTY_NODE, &exec_timeout_min_cmd);
3107   install_element (VTY_NODE, &exec_timeout_sec_cmd);
3108   install_element (VTY_NODE, &no_exec_timeout_cmd);
3109   install_element (VTY_NODE, &vty_access_class_cmd);
3110   install_element (VTY_NODE, &no_vty_access_class_cmd);
3111   install_element (VTY_NODE, &vty_login_cmd);
3112   install_element (VTY_NODE, &no_vty_login_cmd);
3113   install_element (VTY_NODE, &vty_ipv6_access_class_cmd);
3114   install_element (VTY_NODE, &no_vty_ipv6_access_class_cmd);
3115 }
3116
3117 void
3118 vty_terminate (void)
3119 {
3120   if (vty_cwd)
3121     XFREE (MTYPE_TMP, vty_cwd);
3122
3123   if (vtyvec && Vvty_serv_thread)
3124     {
3125       vty_reset ();
3126       vector_free (vtyvec);
3127       vector_free (Vvty_serv_thread);
3128     }
3129 }
3130
3131 /* Utility functions to get arguments from commands generated
3132    by the xml2cli.pl script. */
3133 const char *
3134 vty_get_arg_value (struct vty_arg *args[], const char *arg)
3135 {
3136   while (*args)
3137     {
3138       if (strcmp ((*args)->name, arg) == 0)
3139         return (*args)->value;
3140       args++;
3141     }
3142   return NULL;
3143 }
3144
3145 struct vty_arg *
3146 vty_get_arg (struct vty_arg *args[], const char *arg)
3147 {
3148   while (*args)
3149     {
3150       if (strcmp ((*args)->name, arg) == 0)
3151         return *args;
3152       args++;
3153     }
3154   return NULL;
3155 }