1 /* 2 * Copyright (c) 2001-2003 3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 7 * 8 * Copyright (c) 2010 The FreeBSD Foundation 9 * All rights reserved. 10 * 11 * Portions of this software were developed by Shteryana Sotirova Shopova 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $Begemot: bsnmp/snmpd/snmpmod.h,v 1.32 2006/02/14 09:04:20 brandt_h Exp $ 36 * 37 * SNMP daemon data and functions exported to modules. 38 */ 39 #ifndef snmpmod_h_ 40 #define snmpmod_h_ 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <net/if.h> 45 #include <netinet/in.h> 46 #include "asn1.h" 47 #include "snmp.h" 48 #include "snmpagent.h" 49 50 #define MAX_MOD_ARGS 16 51 52 /* 53 * These macros help to handle object lists for SNMP tables. They use 54 * tail queues to hold the objects in ascending order in the list. 55 * ordering can be done either on an integer/unsigned field, an asn_oid 56 * or an ordering function. 57 */ 58 #define INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \ 59 __typeof (PTR) _lelem; \ 60 \ 61 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 62 if (asn_compare_oid(&_lelem->INDEX, &(PTR)->INDEX) > 0) \ 63 break; \ 64 if (_lelem == NULL) \ 65 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \ 66 else \ 67 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \ 68 } while (0) 69 70 #define INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \ 71 __typeof (PTR) _lelem; \ 72 \ 73 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 74 if ((asn_subid_t)_lelem->INDEX > (asn_subid_t)(PTR)->INDEX)\ 75 break; \ 76 if (_lelem == NULL) \ 77 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \ 78 else \ 79 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \ 80 } while (0) 81 82 #define INSERT_OBJECT_FUNC_LINK(PTR, LIST, LINK, FUNC) do { \ 83 __typeof (PTR) _lelem; \ 84 \ 85 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 86 if ((FUNC)(_lelem, (PTR)) > 0) \ 87 break; \ 88 if (_lelem == NULL) \ 89 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \ 90 else \ 91 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \ 92 } while (0) 93 94 #define INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, LINK, FUNC) do { \ 95 __typeof (PTR) _lelem; \ 96 \ 97 TAILQ_FOREACH_REVERSE(_lelem, (LIST), HEAD, LINK) \ 98 if ((FUNC)(_lelem, (PTR)) < 0) \ 99 break; \ 100 if (_lelem == NULL) \ 101 TAILQ_INSERT_HEAD((LIST), (PTR), LINK); \ 102 else \ 103 TAILQ_INSERT_AFTER((LIST), _lelem, (PTR), LINK); \ 104 } while (0) 105 106 #define FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \ 107 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 108 \ 109 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 110 if (index_compare(OID, SUB, &_lelem->INDEX) == 0) \ 111 break; \ 112 (_lelem); \ 113 }) 114 115 #define NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \ 116 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 117 \ 118 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 119 if (index_compare(OID, SUB, &_lelem->INDEX) < 0) \ 120 break; \ 121 (_lelem); \ 122 }) 123 124 #define FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \ 125 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 126 \ 127 if ((OID)->len - SUB != 1) \ 128 _lelem = NULL; \ 129 else \ 130 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 131 if ((OID)->subs[SUB] == (asn_subid_t)_lelem->INDEX)\ 132 break; \ 133 (_lelem); \ 134 }) 135 136 #define NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \ 137 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 138 \ 139 if ((OID)->len - SUB == 0) \ 140 _lelem = TAILQ_FIRST(LIST); \ 141 else \ 142 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 143 if ((OID)->subs[SUB] < (asn_subid_t)_lelem->INDEX)\ 144 break; \ 145 (_lelem); \ 146 }) 147 148 #define FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \ 149 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 150 \ 151 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 152 if ((FUNC)(OID, SUB, _lelem) == 0) \ 153 break; \ 154 (_lelem); \ 155 }) 156 157 #define NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \ 158 __typeof (TAILQ_FIRST(LIST)) _lelem; \ 159 \ 160 TAILQ_FOREACH(_lelem, (LIST), LINK) \ 161 if ((FUNC)(OID, SUB, _lelem) < 0) \ 162 break; \ 163 (_lelem); \ 164 }) 165 166 /* 167 * Macros for the case where the index field is called 'index' 168 */ 169 #define INSERT_OBJECT_OID_LINK(PTR, LIST, LINK) \ 170 INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, index) 171 172 #define INSERT_OBJECT_INT_LINK(PTR, LIST, LINK) do { \ 173 INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, index) 174 175 #define FIND_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \ 176 FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index) 177 178 #define NEXT_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \ 179 NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index) 180 181 #define FIND_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \ 182 FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index) 183 184 #define NEXT_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \ 185 NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index) 186 187 /* 188 * Macros for the case where the index field is called 'index' and the 189 * link field 'link'. 190 */ 191 #define INSERT_OBJECT_OID(PTR, LIST) \ 192 INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, link, index) 193 194 #define INSERT_OBJECT_INT(PTR, LIST) \ 195 INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, link, index) 196 197 #define INSERT_OBJECT_FUNC_REV(PTR, LIST, HEAD, FUNC) \ 198 INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, link, FUNC) 199 200 #define FIND_OBJECT_OID(LIST, OID, SUB) \ 201 FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index) 202 203 #define FIND_OBJECT_INT(LIST, OID, SUB) \ 204 FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index) 205 206 #define FIND_OBJECT_FUNC(LIST, OID, SUB, FUNC) \ 207 FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC) 208 209 #define NEXT_OBJECT_OID(LIST, OID, SUB) \ 210 NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index) 211 212 #define NEXT_OBJECT_INT(LIST, OID, SUB) \ 213 NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index) 214 215 #define NEXT_OBJECT_FUNC(LIST, OID, SUB, FUNC) \ 216 NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC) 217 218 struct lmodule; 219 220 /* The tick when the program was started. This is the absolute time of 221 * the start in 100th of a second. */ 222 extern uint64_t start_tick; 223 224 /* The tick when the current packet was received. This is the absolute 225 * time in 100th of second. */ 226 extern uint64_t this_tick; 227 228 /* Get the current absolute time in 100th of a second. */ 229 uint64_t get_ticks(void); 230 231 /* 232 * Return code for proxy function 233 */ 234 enum snmpd_proxy_err { 235 /* proxy code will process the PDU */ 236 SNMPD_PROXY_OK, 237 /* proxy code does not process PDU */ 238 SNMPD_PROXY_REJ, 239 /* drop this PDU */ 240 SNMPD_PROXY_DROP, 241 /* drop because of bad community */ 242 SNMPD_PROXY_BADCOMM, 243 /* drop because of bad community use */ 244 SNMPD_PROXY_BADCOMMUSE 245 }; 246 247 /* 248 * Input handling 249 */ 250 enum snmpd_input_err { 251 /* proceed with packet */ 252 SNMPD_INPUT_OK, 253 /* fatal error in packet, ignore it */ 254 SNMPD_INPUT_FAILED, 255 /* value encoding has wrong length in a SET operation */ 256 SNMPD_INPUT_VALBADLEN, 257 /* value encoding is out of range */ 258 SNMPD_INPUT_VALRANGE, 259 /* value has bad encoding */ 260 SNMPD_INPUT_VALBADENC, 261 /* need more data (truncated packet) */ 262 SNMPD_INPUT_TRUNC, 263 /* unknown community */ 264 SNMPD_INPUT_BAD_COMM, 265 }; 266 267 /* 268 * Every loadable module must have one of this structures with 269 * the external name 'config'. 270 */ 271 struct snmp_module { 272 /* a comment describing what this module implements */ 273 const char *comment; 274 275 /* the initialization function */ 276 int (*init)(struct lmodule *, int argc, char *argv[]); 277 278 /* the finalisation function */ 279 int (*fini)(void); 280 281 /* the idle function */ 282 void (*idle)(void); 283 284 /* the dump function */ 285 void (*dump)(void); 286 287 /* re-configuration function */ 288 void (*config)(void); 289 290 /* start operation */ 291 void (*start)(void); 292 293 /* proxy a PDU */ 294 enum snmpd_proxy_err (*proxy)(struct snmp_pdu *, void *, 295 const struct asn_oid *, const struct sockaddr *, socklen_t, 296 enum snmpd_input_err, int32_t, int); 297 298 /* the tree this module is going to server */ 299 const struct snmp_node *tree; 300 u_int tree_size; 301 302 /* function called, when another module was unloaded/loaded */ 303 void (*loading)(const struct lmodule *, int); 304 }; 305 306 /* 307 * Stuff exported to modules 308 */ 309 310 /* 311 * The system group. 312 */ 313 struct systemg { 314 u_char *descr; 315 struct asn_oid object_id; 316 u_char *contact; 317 u_char *name; 318 u_char *location; 319 u_int32_t services; 320 u_int32_t or_last_change; 321 }; 322 extern struct systemg systemg; 323 324 /* 325 * Community support. 326 * 327 * We have 2 fixed communities for SNMP read and write access. Modules 328 * can create their communities dynamically. They are deleted automatically 329 * if the module is unloaded. 330 */ 331 #define COMM_INITIALIZE 0 332 #define COMM_READ 1 333 #define COMM_WRITE 2 334 335 u_int comm_define(u_int, const char *descr, struct lmodule *, const char *str); 336 const char * comm_string(u_int); 337 338 /* community for current packet */ 339 extern u_int community; 340 341 /* 342 * SNMP User-based Security Model data. Modified via the snmp_usm(3) module. 343 */ 344 struct snmpd_usmstat { 345 uint32_t unsupported_seclevels; 346 uint32_t not_in_time_windows; 347 uint32_t unknown_users; 348 uint32_t unknown_engine_ids; 349 uint32_t wrong_digests; 350 uint32_t decrypt_errors; 351 }; 352 353 extern struct snmpd_usmstat snmpd_usmstats; 354 struct snmpd_usmstat *bsnmpd_get_usm_stats(void); 355 void bsnmpd_reset_usm_stats(void); 356 357 struct usm_user { 358 struct snmp_user suser; 359 uint8_t user_engine_id[SNMP_ENGINE_ID_SIZ]; 360 uint32_t user_engine_len; 361 char user_public[SNMP_ADM_STR32_SIZ]; 362 uint32_t user_public_len; 363 int32_t status; 364 int32_t type; 365 SLIST_ENTRY(usm_user) up; 366 }; 367 368 SLIST_HEAD(usm_userlist, usm_user); 369 struct usm_user *usm_first_user(void); 370 struct usm_user *usm_next_user(struct usm_user *); 371 struct usm_user *usm_find_user(uint8_t *, uint32_t, char *); 372 struct usm_user *usm_new_user(uint8_t *, uint32_t, char *); 373 void usm_delete_user(struct usm_user *); 374 void usm_flush_users(void); 375 376 /* USM user for current packet */ 377 extern struct usm_user *usm_user; 378 379 /* 380 * SNMP View-based Access Control Model data. Modified via the snmp_vacm(3) module. 381 */ 382 struct vacm_group; 383 384 struct vacm_user { 385 /* Security user name from USM */ 386 char secname[SNMP_ADM_STR32_SIZ]; 387 int32_t sec_model; 388 /* Back pointer to user assigned group name */ 389 struct vacm_group *group; 390 int32_t type; 391 int32_t status; 392 SLIST_ENTRY(vacm_user) vvu; 393 SLIST_ENTRY(vacm_user) vvg; 394 }; 395 396 SLIST_HEAD(vacm_userlist, vacm_user); 397 398 struct vacm_group { 399 char groupname[SNMP_ADM_STR32_SIZ]; 400 struct vacm_userlist group_users; 401 SLIST_ENTRY(vacm_group) vge; 402 }; 403 404 SLIST_HEAD(vacm_grouplist, vacm_group); 405 406 struct vacm_access { 407 /* The group name is index, not a column in the table */ 408 struct vacm_group *group; 409 char ctx_prefix[SNMP_ADM_STR32_SIZ]; 410 int32_t sec_model; 411 int32_t sec_level; 412 int32_t ctx_match; 413 struct vacm_view *read_view; 414 struct vacm_view *write_view; 415 struct vacm_view *notify_view; 416 int32_t type; 417 int32_t status; 418 TAILQ_ENTRY(vacm_access) vva; 419 }; 420 421 TAILQ_HEAD(vacm_accesslist, vacm_access); 422 423 struct vacm_view { 424 char viewname[SNMP_ADM_STR32_SIZ]; /* key */ 425 struct asn_oid subtree; /* key */ 426 uint8_t mask[16]; 427 uint8_t exclude; 428 int32_t type; 429 int32_t status; 430 SLIST_ENTRY(vacm_view) vvl; 431 }; 432 433 SLIST_HEAD(vacm_viewlist, vacm_view); 434 435 struct vacm_context { 436 /* The ID of the module that registered this context */ 437 int32_t regid; 438 char ctxname[SNMP_ADM_STR32_SIZ]; 439 SLIST_ENTRY(vacm_context) vcl; 440 }; 441 442 SLIST_HEAD(vacm_contextlist, vacm_context); 443 444 void vacm_groups_init(void); 445 struct vacm_user *vacm_first_user(void); 446 struct vacm_user *vacm_next_user(struct vacm_user *); 447 struct vacm_user *vacm_new_user(int32_t, char *); 448 int vacm_delete_user(struct vacm_user *); 449 int vacm_user_set_group(struct vacm_user *, u_char *, u_int); 450 struct vacm_access *vacm_first_access_rule(void); 451 struct vacm_access *vacm_next_access_rule(struct vacm_access *); 452 struct vacm_access *vacm_new_access_rule(char *, char *, int32_t, int32_t); 453 int vacm_delete_access_rule(struct vacm_access *); 454 struct vacm_view *vacm_first_view(void); 455 struct vacm_view *vacm_next_view(struct vacm_view *); 456 struct vacm_view *vacm_new_view(char *, struct asn_oid *); 457 int vacm_delete_view(struct vacm_view *); 458 struct vacm_context *vacm_first_context(void); 459 struct vacm_context *vacm_next_context(struct vacm_context *); 460 struct vacm_context *vacm_add_context(char *, int32_t); 461 void vacm_flush_contexts(int32_t); 462 463 /* 464 * RFC 3413 SNMP Management Target & Notification MIB 465 */ 466 467 struct snmpd_target_stats { 468 uint32_t unavail_contexts; 469 uint32_t unknown_contexts; 470 }; 471 472 #define SNMP_UDP_ADDR_SIZ 6 473 #define SNMP_TAG_SIZ (255 + 1) 474 475 struct target_address { 476 char name[SNMP_ADM_STR32_SIZ]; 477 uint8_t address[SNMP_UDP_ADDR_SIZ]; 478 int32_t timeout; 479 int32_t retry; 480 char taglist[SNMP_TAG_SIZ]; 481 char paramname[SNMP_ADM_STR32_SIZ]; 482 int32_t type; 483 int32_t socket; 484 int32_t status; 485 SLIST_ENTRY(target_address) ta; 486 }; 487 488 SLIST_HEAD(target_addresslist, target_address); 489 490 struct target_param { 491 char name[SNMP_ADM_STR32_SIZ]; 492 int32_t mpmodel; 493 int32_t sec_model; 494 char secname[SNMP_ADM_STR32_SIZ]; 495 enum snmp_usm_level sec_level; 496 int32_t type; 497 int32_t status; 498 SLIST_ENTRY(target_param) tp; 499 }; 500 501 SLIST_HEAD(target_paramlist, target_param); 502 503 struct target_notify { 504 char name[SNMP_ADM_STR32_SIZ]; 505 char taglist[SNMP_TAG_SIZ]; 506 int32_t notify_type; 507 int32_t type; 508 int32_t status; 509 SLIST_ENTRY(target_notify) tn; 510 }; 511 512 SLIST_HEAD(target_notifylist, target_notify); 513 514 extern struct snmpd_target_stats snmpd_target_stats; 515 struct snmpd_target_stats *bsnmpd_get_target_stats(void); 516 struct target_address *target_first_address(void); 517 struct target_address *target_next_address(struct target_address *); 518 struct target_address *target_new_address(char *); 519 int target_activate_address(struct target_address *); 520 int target_delete_address(struct target_address *); 521 struct target_param *target_first_param(void); 522 struct target_param *target_next_param(struct target_param *); 523 struct target_param *target_new_param(char *); 524 int target_delete_param(struct target_param *); 525 struct target_notify *target_first_notify(void); 526 struct target_notify *target_next_notify(struct target_notify *); 527 struct target_notify *target_new_notify(char *); 528 int target_delete_notify (struct target_notify *); 529 void target_flush_all(void); 530 531 /* 532 * Well known OIDs 533 */ 534 extern const struct asn_oid oid_zeroDotZero; 535 536 /* SNMPv3 Engine Discovery */ 537 extern const struct asn_oid oid_usmUnknownEngineIDs; 538 extern const struct asn_oid oid_usmNotInTimeWindows; 539 540 /* 541 * Request ID ranges. 542 * 543 * A module can request a range of request ids and associate them with a 544 * type field. All ranges are deleted if a module is unloaded. 545 */ 546 u_int reqid_allocate(int size, struct lmodule *); 547 int32_t reqid_next(u_int type); 548 int32_t reqid_base(u_int type); 549 int reqid_istype(int32_t reqid, u_int type); 550 u_int reqid_type(int32_t reqid); 551 552 /* 553 * Timers. 554 */ 555 void *timer_start(u_int, void (*)(void *), void *, struct lmodule *); 556 void *timer_start_repeat(u_int, u_int, void (*)(void *), void *, 557 struct lmodule *); 558 void timer_stop(void *); 559 560 /* 561 * File descriptors 562 */ 563 void *fd_select(int, void (*)(int, void *), void *, struct lmodule *); 564 void fd_deselect(void *); 565 void fd_suspend(void *); 566 int fd_resume(void *); 567 568 /* 569 * Object resources 570 */ 571 u_int or_register(const struct asn_oid *, const char *, struct lmodule *); 572 void or_unregister(u_int); 573 574 /* 575 * Buffers 576 */ 577 void *buf_alloc(int tx); 578 size_t buf_size(int tx); 579 580 /* decode PDU and find community */ 581 enum snmpd_input_err snmp_input_start(const u_char *, size_t, const char *, 582 struct snmp_pdu *, int32_t *, size_t *); 583 584 /* process the pdu. returns either _OK or _FAILED */ 585 enum snmpd_input_err snmp_input_finish(struct snmp_pdu *, const u_char *, 586 size_t, u_char *, size_t *, const char *, enum snmpd_input_err, int32_t, 587 void *); 588 589 void snmp_output(struct snmp_pdu *, u_char *, size_t *, const char *); 590 void snmp_send_port(void *, const struct asn_oid *, struct snmp_pdu *, 591 const struct sockaddr *, socklen_t); 592 enum snmp_code snmp_pdu_auth_access(struct snmp_pdu *, int32_t *); 593 594 /* sending traps */ 595 void snmp_send_trap(const struct asn_oid *, ...); 596 597 /* 598 * Action support 599 */ 600 int string_save(struct snmp_value *, struct snmp_context *, ssize_t, u_char **); 601 void string_commit(struct snmp_context *); 602 void string_rollback(struct snmp_context *, u_char **); 603 int string_get(struct snmp_value *, const u_char *, ssize_t); 604 int string_get_max(struct snmp_value *, const u_char *, ssize_t, size_t); 605 void string_free(struct snmp_context *); 606 607 int ip_save(struct snmp_value *, struct snmp_context *, u_char *); 608 void ip_rollback(struct snmp_context *, u_char *); 609 void ip_commit(struct snmp_context *); 610 int ip_get(struct snmp_value *, u_char *); 611 612 int oid_save(struct snmp_value *, struct snmp_context *, struct asn_oid *); 613 void oid_rollback(struct snmp_context *, struct asn_oid *); 614 void oid_commit(struct snmp_context *); 615 int oid_get(struct snmp_value *, const struct asn_oid *); 616 617 int index_decode(const struct asn_oid *oid, u_int sub, u_int code, ...); 618 int index_compare(const struct asn_oid *, u_int, const struct asn_oid *); 619 int index_compare_off(const struct asn_oid *, u_int, const struct asn_oid *, 620 u_int); 621 void index_append(struct asn_oid *, u_int, const struct asn_oid *); 622 void index_append_off(struct asn_oid *, u_int, const struct asn_oid *, u_int); 623 624 #endif 625