vtysh/vtysh_config.c

   1 /* Configuration generator.
   2  * Copyright (C) 2000 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include "command.h"
  24 #include "linklist.h"
  25 #include "memory.h"
  26
  27 #include "vtysh/vtysh.h"
  28 #include "vtysh/vtysh_user.h"
  29
  30 DEFINE_MGROUP(MVTYSH, "vtysh")
  31 DEFINE_MTYPE_STATIC(MVTYSH, VTYSH_CONFIG, "Vtysh configuration")
  32 DEFINE_MTYPE_STATIC(MVTYSH, VTYSH_CONFIG_LINE, "Vtysh configuration line")
  33
  34 vector configvec;
  35
  36 struct config {
  37         /* Configuration node name. */
  38         char *name;
  39
  40         /* Configuration string line. */
  41         struct list *line;
  42
  43         /* Configuration can be nest. */
  44         struct config *config;
  45
  46         /* Index of this config. */
  47         uint32_t index;
  48 };
  49
  50 struct list *config_top;
  51
  52 static int line_cmp(char *c1, char *c2)
  53 {
  54         return strcmp(c1, c2);
  55 }
  56
  57 static void line_del(char *line)
  58 {
  59         XFREE(MTYPE_VTYSH_CONFIG_LINE, line);
  60 }
  61
  62 static struct config *config_new(void)
  63 {
  64         struct config *config;
  65         config = XCALLOC(MTYPE_VTYSH_CONFIG, sizeof(struct config));
  66         return config;
  67 }
  68
  69 static int config_cmp(struct config *c1, struct config *c2)
  70 {
  71         return strcmp(c1->name, c2->name);
  72 }
  73
  74 static void config_del(struct config *config)
  75 {
  76         list_delete(&config->line);
  77         if (config->name)
  78                 XFREE(MTYPE_VTYSH_CONFIG_LINE, config->name);
  79         XFREE(MTYPE_VTYSH_CONFIG, config);
  80 }
  81
  82 static struct config *config_get(int index, const char *line)
  83 {
  84         struct config *config;
  85         struct config *config_loop;
  86         struct list *master;
  87         struct listnode *node, *nnode;
  88
  89         config = config_loop = NULL;
  90
  91         master = vector_lookup_ensure(configvec, index);
  92
  93         if (!master) {
  94                 master = list_new();
  95                 master->del = (void (*)(void *))config_del;
  96                 master->cmp = (int (*)(void *, void *))config_cmp;
  97                 vector_set_index(configvec, index, master);
  98         }
  99
 100         for (ALL_LIST_ELEMENTS(master, node, nnode, config_loop)) {
 101                 if (strcmp(config_loop->name, line) == 0)
 102                         config = config_loop;
 103         }
 104
 105         if (!config) {
 106                 config = config_new();
 107                 config->line = list_new();
 108                 config->line->del = (void (*)(void *))line_del;
 109                 config->line->cmp = (int (*)(void *, void *))line_cmp;
 110                 config->name = XSTRDUP(MTYPE_VTYSH_CONFIG_LINE, line);
 111                 config->index = index;
 112                 listnode_add(master, config);
 113         }
 114         return config;
 115 }
 116
 117 void config_add_line(struct list *config, const char *line)
 118 {
 119         listnode_add(config, XSTRDUP(MTYPE_VTYSH_CONFIG_LINE, line));
 120 }
 121
 122 static void config_add_line_uniq(struct list *config, const char *line)
 123 {
 124         struct listnode *node, *nnode;
 125         char *pnt;
 126
 127         for (ALL_LIST_ELEMENTS(config, node, nnode, pnt)) {
 128                 if (strcmp(pnt, line) == 0)
 129                         return;
 130         }
 131         listnode_add_sort(config, XSTRDUP(MTYPE_VTYSH_CONFIG_LINE, line));
 132 }
 133
 134 /*
 135  * Add a line that should only be shown once, and always show at the end of the
 136  * config block.
 137  *
 138  * If the line already exists, it will be moved to the end of the block. If it
 139  * does not exist, it will be added at the end of the block.
 140  *
 141  * Note that this only makes sense when there is just one such line that should
 142  * show up at the very end of a config block. Furthermore, if the same block
 143  * can show up from multiple daemons, all of them must make sure to print the
 144  * line at the end of their config, otherwise the line will show at the end of
 145  * the config for the last daemon that printed it.
 146  *
 147  * Here is a motivating example with the 'exit-vrf' command. Suppose we receive
 148  * a config from Zebra like so:
 149  *
 150  * vrf BLUE
 151  *    ip route A
 152  *    ip route B
 153  *    exit-vrf
 154  *
 155  * Then suppose we later receive this config from PIM:
 156  *
 157  * vrf BLUE
 158  *    ip msdp mesh-group MyGroup member 1.2.3.4
 159  *    exit-vrf
 160  *
 161  * Then we will combine them into one config block like so:
 162  *
 163  * vrf BLUE
 164  *    ip route A
 165  *    ip route B
 166  *    ip msdp mesh-group MyGroup member 1.2.3.4
 167  *    exit-vrf
 168  *
 169  * Because PIM also sent us an 'exit-vrf', we noticed that we already had one
 170  * under the 'vrf BLUE' config block and so we moved it to the end of the
 171  * config block again. If PIM had neglected to send us 'exit-vrf', the result
 172  * would be this:
 173  *
 174  * vrf BLUE
 175  *    ip route A
 176  *    ip route B
 177  *    exit-vrf
 178  *    ip msdp mesh-group MyGroup member 1.2.3.4
 179  *
 180  * Therefore, daemons that share config blocks must take care to consistently
 181  * print the same block terminators.
 182  *
 183  * Ideally this would be solved by adding a string to struct config that is
 184  * always printed at the end when dumping a config. However, this would only
 185  * work when the user is using integrated config. In the non-integrated config
 186  * case, daemons are responsible for writing their own config files, and so the
 187  * must be able to print these blocks correctly independently of vtysh, which
 188  * means they are the ones that need to handle printing the block terminators
 189  * and VTYSH needs to be smart enough to combine them properly.
 190  *
 191  * ---
 192  *
 193  * config
 194  *    The config to add the line to
 195  *
 196  * line
 197  *    The line to add to the end of the config
 198  */
 199 static void config_add_line_uniq_end(struct list *config, const char *line)
 200 {
 201         struct listnode *node;
 202         char *pnt;
 203
 204         for (ALL_LIST_ELEMENTS_RO(config, node, pnt)) {
 205                 if (strcmp(pnt, line) == 0)
 206                         break;
 207         }
 208
 209         if (!node)
 210                 config_add_line(config, line);
 211         else
 212                 listnode_move_to_tail(config, node);
 213 }
 214
 215 void vtysh_config_parse_line(void *arg, const char *line)
 216 {
 217         char c;
 218         static struct config *config = NULL;
 219
 220         if (!line)
 221                 return;
 222
 223         c = line[0];
 224
 225         if (c == '\0')
 226                 return;
 227
 228         switch (c) {
 229         /* Suppress exclamation points ! and commented lines. The !s are
 230          * generated
 231          * dynamically in vtysh_config_dump() */
 232         case '!':
 233         case '#':
 234                 break;
 235         case ' ':
 236                 /* Store line to current configuration. */
 237                 if (config) {
 238                         if (strncmp(line, " link-params",
 239                                     strlen(" link-params"))
 240                             == 0) {
 241                                 config_add_line(config->line, line);
 242                                 config->index = LINK_PARAMS_NODE;
 243                         } else if (strncmp(line, " ip multicast boundary",
 244                                            strlen(" ip multicast boundary"))
 245                                    == 0) {
 246                                 config_add_line_uniq_end(config->line, line);
 247                         } else if (strncmp(line, " ip igmp query-interval",
 248                                            strlen(" ip igmp query-interval")) == 0) {
 249                                 config_add_line_uniq_end(config->line, line);
 250                         } else if (config->index == LINK_PARAMS_NODE
 251                                    && strncmp(line, "  exit-link-params",
 252                                               strlen("  exit"))
 253                                               == 0) {
 254                                 config_add_line(config->line, line);
 255                                 config->index = INTERFACE_NODE;
 256                         } else if (config->index == VRF_NODE
 257                                    && strncmp(line, " exit-vrf",
 258                                               strlen(" exit-vrf"))
 259                                               == 0) {
 260                                 config_add_line_uniq_end(config->line, line);
 261                         } else if (config->index == RMAP_NODE
 262                                    || config->index == INTERFACE_NODE
 263                                    || config->index == LOGICALROUTER_NODE
 264                                    || config->index == VTY_NODE
 265                                    || config->index == VRF_NODE)
 266                                 config_add_line_uniq(config->line, line);
 267                         else
 268                                 config_add_line(config->line, line);
 269                 } else
 270                         config_add_line(config_top, line);
 271                 break;
 272         default:
 273                 if (strncmp(line, "interface", strlen("interface")) == 0)
 274                         config = config_get(INTERFACE_NODE, line);
 275                 else if (strncmp(line, "pseudowire", strlen("pseudowire")) == 0)
 276                         config = config_get(PW_NODE, line);
 277                 else if (strncmp(line, "logical-router", strlen("logical-router")) == 0)
 278                         config = config_get(LOGICALROUTER_NODE, line);
 279                 else if (strncmp(line, "vrf", strlen("vrf")) == 0)
 280                         config = config_get(VRF_NODE, line);
 281                 else if (strncmp(line, "nexthop-group", strlen("nexthop-group"))
 282                          == 0)
 283                         config = config_get(NH_GROUP_NODE, line);
 284                 else if (strncmp(line, "router-id", strlen("router-id")) == 0)
 285                         config = config_get(ZEBRA_NODE, line);
 286                 else if (strncmp(line, "router rip", strlen("router rip")) == 0)
 287                         config = config_get(RIP_NODE, line);
 288                 else if (strncmp(line, "router ripng", strlen("router ripng"))
 289                          == 0)
 290                         config = config_get(RIPNG_NODE, line);
 291                 else if (strncmp(line, "router eigrp", strlen("router eigrp"))
 292                          == 0)
 293                         config = config_get(EIGRP_NODE, line);
 294                 else if (strncmp(line, "router babel", strlen("router babel"))
 295                          == 0)
 296                         config = config_get(BABEL_NODE, line);
 297                 else if (strncmp(line, "router ospf", strlen("router ospf"))
 298                          == 0)
 299                         config = config_get(OSPF_NODE, line);
 300                 else if (strncmp(line, "router ospf6", strlen("router ospf6"))
 301                          == 0)
 302                         config = config_get(OSPF6_NODE, line);
 303                 else if (strncmp(line, "mpls ldp", strlen("mpls ldp")) == 0)
 304                         config = config_get(LDP_NODE, line);
 305                 else if (strncmp(line, "l2vpn", strlen("l2vpn")) == 0)
 306                         config = config_get(LDP_L2VPN_NODE, line);
 307                 else if (strncmp(line, "router bgp", strlen("router bgp")) == 0)
 308                         config = config_get(BGP_NODE, line);
 309                 else if (strncmp(line, "router isis", strlen("router isis"))
 310                          == 0)
 311                         config = config_get(ISIS_NODE, line);
 312                 else if (strncmp(line, "router openfabric", strlen("router openfabric"))
 313                          == 0)
 314                         config = config_get(OPENFABRIC_NODE, line);
 315                 else if (strncmp(line, "route-map", strlen("route-map")) == 0)
 316                         config = config_get(RMAP_NODE, line);
 317                 else if (strncmp(line, "pbr-map", strlen("pbr-map")) == 0)
 318                         config = config_get(PBRMAP_NODE, line);
 319                 else if (strncmp(line, "access-list", strlen("access-list"))
 320                          == 0)
 321                         config = config_get(ACCESS_NODE, line);
 322                 else if (strncmp(line, "ipv6 access-list",
 323                                  strlen("ipv6 access-list"))
 324                          == 0)
 325                         config = config_get(ACCESS_IPV6_NODE, line);
 326                 else if (strncmp(line, "mac access-list",
 327                                  strlen("mac access-list"))
 328                          == 0)
 329                         config = config_get(ACCESS_MAC_NODE, line);
 330                 else if (strncmp(line, "ip prefix-list",
 331                                  strlen("ip prefix-list"))
 332                          == 0)
 333                         config = config_get(PREFIX_NODE, line);
 334                 else if (strncmp(line, "ipv6 prefix-list",
 335                                  strlen("ipv6 prefix-list"))
 336                          == 0)
 337                         config = config_get(PREFIX_IPV6_NODE, line);
 338                 else if (strncmp(line, "bgp as-path access-list",
 339                                  strlen("bgp as-path access-list"))
 340                          == 0)
 341                         config = config_get(AS_LIST_NODE, line);
 342                 else if (strncmp(line, "bgp community-list",
 343                                  strlen("bgp community-list"))
 344                                  == 0
 345                          || strncmp(line, "bgp extcommunity-list",
 346                                     strlen("bgp extcommunity-list"))
 347                                     == 0
 348                          || strncmp(line, "bgp large-community-list",
 349                                     strlen("bgp large-community-list"))
 350                                     == 0)
 351                         config = config_get(COMMUNITY_LIST_NODE, line);
 352                 else if (strncmp(line, "ip route", strlen("ip route")) == 0)
 353                         config = config_get(IP_NODE, line);
 354                 else if (strncmp(line, "ipv6 route", strlen("ipv6 route")) == 0)
 355                         config = config_get(IP_NODE, line);
 356                 else if (strncmp(line, "key", strlen("key")) == 0)
 357                         config = config_get(KEYCHAIN_NODE, line);
 358                 else if (strncmp(line, "line", strlen("line")) == 0)
 359                         config = config_get(VTY_NODE, line);
 360                 else if ((strncmp(line, "ipv6 forwarding",
 361                                   strlen("ipv6 forwarding"))
 362                           == 0)
 363                          || (strncmp(line, "ip forwarding",
 364                                      strlen("ip forwarding"))
 365                              == 0))
 366                         config = config_get(FORWARDING_NODE, line);
 367                 else if (strncmp(line, "debug vrf", strlen("debug vrf")) == 0)
 368                         config = config_get(VRF_DEBUG_NODE, line);
 369                 else if (strncmp(line, "debug northbound",
 370                                  strlen("debug northbound"))
 371                          == 0)
 372                         config = config_get(NORTHBOUND_DEBUG_NODE, line);
 373                 else if (strncmp(line, "debug", strlen("debug")) == 0)
 374                         config = config_get(DEBUG_NODE, line);
 375                 else if (strncmp(line, "password", strlen("password")) == 0
 376                          || strncmp(line, "enable password",
 377                                     strlen("enable password"))
 378                                     == 0)
 379                         config = config_get(AAA_NODE, line);
 380                 else if (strncmp(line, "ip protocol", strlen("ip protocol"))
 381                          == 0)
 382                         config = config_get(PROTOCOL_NODE, line);
 383                 else if (strncmp(line, "ipv6 protocol", strlen("ipv6 protocol"))
 384                          == 0)
 385                         config = config_get(PROTOCOL_NODE, line);
 386                 else if (strncmp(line, "ip nht", strlen("ip nht")) == 0)
 387                         config = config_get(PROTOCOL_NODE, line);
 388                 else if (strncmp(line, "ipv6 nht", strlen("ipv6 nht")) == 0)
 389                         config = config_get(PROTOCOL_NODE, line);
 390                 else if (strncmp(line, "mpls", strlen("mpls")) == 0)
 391                         config = config_get(MPLS_NODE, line);
 392                 else if (strncmp(line, "bfd", strlen("bfd")) == 0)
 393                         config = config_get(BFD_NODE, line);
 394                 else {
 395                         if (strncmp(line, "log", strlen("log")) == 0
 396                             || strncmp(line, "hostname", strlen("hostname"))
 397                                        == 0
 398                             || strncmp(line, "frr", strlen("frr")) == 0
 399                             || strncmp(line, "agentx", strlen("agentx")) == 0
 400                             || strncmp(line, "no log", strlen("no log")) == 0)
 401                                 config_add_line_uniq(config_top, line);
 402                         else
 403                                 config_add_line(config_top, line);
 404                         config = NULL;
 405                 }
 406                 break;
 407         }
 408 }
 409
 410 /* Macro to check delimiter is needed between each configuration line
 411  * or not. */
 412 #define NO_DELIMITER(I)                                                        \
 413         ((I) == ACCESS_NODE || (I) == PREFIX_NODE || (I) == IP_NODE            \
 414          || (I) == AS_LIST_NODE || (I) == COMMUNITY_LIST_NODE                  \
 415          || (I) == ACCESS_IPV6_NODE || (I) == ACCESS_MAC_NODE                  \
 416          || (I) == PREFIX_IPV6_NODE || (I) == FORWARDING_NODE                  \
 417          || (I) == DEBUG_NODE || (I) == AAA_NODE || (I) == VRF_DEBUG_NODE      \
 418          || (I) == NORTHBOUND_DEBUG_NODE || (I) == MPLS_NODE)
 419
 420 /* Display configuration to file pointer. */
 421 void vtysh_config_dump(void)
 422 {
 423         struct listnode *node, *nnode;
 424         struct listnode *mnode, *mnnode;
 425         struct config *config;
 426         struct list *master;
 427         char *line;
 428         unsigned int i;
 429
 430         for (ALL_LIST_ELEMENTS(config_top, node, nnode, line))
 431                 vty_out(vty, "%s\n", line);
 432
 433         vty_out(vty, "!\n");
 434
 435         for (i = 0; i < vector_active(configvec); i++)
 436                 if ((master = vector_slot(configvec, i)) != NULL) {
 437                         for (ALL_LIST_ELEMENTS(master, node, nnode, config)) {
 438                                 /* Don't print empty sections for interface.
 439                                  * Route maps on the
 440                                  * other hand could have a legitimate empty
 441                                  * section at the end.
 442                                  * VRF is handled in the backend, we could have
 443                                  * "configured" VRFs with static routes which
 444                                  * are not under the VRF node.
 445                                  */
 446                                 if (config->index == INTERFACE_NODE
 447                                     && list_isempty(config->line))
 448                                         continue;
 449
 450                                 vty_out(vty, "%s\n", config->name);
 451
 452                                 for (ALL_LIST_ELEMENTS(config->line, mnode,
 453                                                        mnnode, line))
 454                                         vty_out(vty, "%s\n", line);
 455                                 if (!NO_DELIMITER(i))
 456                                         vty_out(vty, "!\n");
 457                         }
 458                         if (NO_DELIMITER(i))
 459                                 vty_out(vty, "!\n");
 460                 }
 461
 462         for (i = 0; i < vector_active(configvec); i++)
 463                 if ((master = vector_slot(configvec, i)) != NULL) {
 464                         list_delete(&master);
 465                         vector_slot(configvec, i) = NULL;
 466                 }
 467         list_delete_all_node(config_top);
 468 }
 469
 470 /* Read up configuration file from file_name. */
 471 static int vtysh_read_file(FILE *confp)
 472 {
 473         struct vty *vty;
 474         int ret;
 475
 476         vty = vty_new();
 477         vty->wfd = STDERR_FILENO;
 478         vty->type = VTY_TERM;
 479         vty->node = CONFIG_NODE;
 480
 481         vtysh_execute_no_pager("enable");
 482         vtysh_execute_no_pager("configure terminal");
 483
 484         /* Execute configuration file. */
 485         ret = vtysh_config_from_file(vty, confp);
 486
 487         vtysh_execute_no_pager("end");
 488         vtysh_execute_no_pager("disable");
 489
 490         vty_close(vty);
 491
 492         return (ret);
 493 }
 494
 495 /* Read up configuration file from config_default_dir. */
 496 int vtysh_read_config(const char *config_default_dir)
 497 {
 498         FILE *confp = NULL;
 499         int ret;
 500
 501         confp = fopen(config_default_dir, "r");
 502         if (confp == NULL) {
 503                 fprintf(stderr,
 504                         "%% Can't open configuration file %s due to '%s'.\n",
 505                         config_default_dir, safe_strerror(errno));
 506                 return (CMD_ERR_NO_FILE);
 507         }
 508
 509         ret = vtysh_read_file(confp);
 510         fclose(confp);
 511
 512         return (ret);
 513 }
 514
 515 /* We don't write vtysh specific into file from vtysh. vtysh.conf should
 516  * be edited by hand. So, we handle only "write terminal" case here and
 517  * integrate vtysh specific conf with conf from daemons.
 518  */
 519 void vtysh_config_write()
 520 {
 521         char line[81];
 522
 523         if (cmd_hostname_get()) {
 524                 sprintf(line, "hostname %s", cmd_hostname_get());
 525                 vtysh_config_parse_line(NULL, line);
 526         }
 527
 528         if (cmd_domainname_get()) {
 529                 sprintf(line, "domainname %s", cmd_domainname_get());
 530                 vtysh_config_parse_line(NULL, line);
 531         }
 532         if (vtysh_write_integrated == WRITE_INTEGRATED_NO)
 533                 vtysh_config_parse_line(NULL,
 534                                         "no service integrated-vtysh-config");
 535         if (vtysh_write_integrated == WRITE_INTEGRATED_YES)
 536                 vtysh_config_parse_line(NULL,
 537                                         "service integrated-vtysh-config");
 538
 539         user_config_write();
 540 }
 541
 542 void vtysh_config_init()
 543 {
 544         config_top = list_new();
 545         config_top->del = (void (*)(void *))line_del;
 546         configvec = vector_init(1);
 547 }