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msg_out.c
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00001 /** 00002 * @file 00003 * SNMP output message processing (RFC1157). 00004 * 00005 * Output responses and traps are build in two passes: 00006 * 00007 * Pass 0: iterate over the output message backwards to determine encoding lengths 00008 * Pass 1: the actual forward encoding of internal form into ASN1 00009 * 00010 * The single-pass encoding method described by Comer & Stevens 00011 * requires extra buffer space and copying for reversal of the packet. 00012 * The buffer requirement can be prohibitively large for big payloads 00013 * (>= 484) therefore we use the two encoding passes. 00014 */ 00015 00016 /* 00017 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. 00018 * All rights reserved. 00019 * 00020 * Redistribution and use in source and binary forms, with or without modification, 00021 * are permitted provided that the following conditions are met: 00022 * 00023 * 1. Redistributions of source code must retain the above copyright notice, 00024 * this list of conditions and the following disclaimer. 00025 * 2. Redistributions in binary form must reproduce the above copyright notice, 00026 * this list of conditions and the following disclaimer in the documentation 00027 * and/or other materials provided with the distribution. 00028 * 3. The name of the author may not be used to endorse or promote products 00029 * derived from this software without specific prior written permission. 00030 * 00031 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00032 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00033 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00034 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00035 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00036 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00037 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00038 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00039 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00040 * OF SUCH DAMAGE. 00041 * 00042 * Author: Christiaan Simons <christiaan.simons@axon.tv> 00043 */ 00044 00045 #include "lwip/opt.h" 00046 00047 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ 00048 00049 #include "lwip/udp.h" 00050 #include "lwip/netif.h" 00051 #include "lwip/snmp.h" 00052 #include "lwip/snmp_asn1.h" 00053 #include "lwip/snmp_msg.h" 00054 00055 struct snmp_trap_dst 00056 { 00057 /* destination IP address in network order */ 00058 ip_addr_t dip; 00059 /* set to 0 when disabled, >0 when enabled */ 00060 u8_t enable; 00061 }; 00062 struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS]; 00063 00064 /** TRAP message structure */ 00065 struct snmp_msg_trap trap_msg; 00066 00067 static u16_t snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len); 00068 static u16_t snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len); 00069 static u16_t snmp_varbind_list_sum(struct snmp_varbind_root *root); 00070 00071 static u16_t snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p); 00072 static u16_t snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p); 00073 static u16_t snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs); 00074 00075 /** 00076 * Sets enable switch for this trap destination. 00077 * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1 00078 * @param enable switch if 0 destination is disabled >0 enabled. 00079 */ 00080 void 00081 snmp_trap_dst_enable(u8_t dst_idx, u8_t enable) 00082 { 00083 if (dst_idx < SNMP_TRAP_DESTINATIONS) 00084 { 00085 trap_dst[dst_idx].enable = enable; 00086 } 00087 } 00088 00089 /** 00090 * Sets IPv4 address for this trap destination. 00091 * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1 00092 * @param dst IPv4 address in host order. 00093 */ 00094 void 00095 snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst) 00096 { 00097 if (dst_idx < SNMP_TRAP_DESTINATIONS) 00098 { 00099 ip_addr_set(&trap_dst[dst_idx].dip, dst); 00100 } 00101 } 00102 00103 /** 00104 * Sends a 'getresponse' message to the request originator. 00105 * 00106 * @param m_stat points to the current message request state source 00107 * @return ERR_OK when success, ERR_MEM if we're out of memory 00108 * 00109 * @note the caller is responsible for filling in outvb in the m_stat 00110 * and provide error-status and index (except for tooBig errors) ... 00111 */ 00112 err_t 00113 snmp_send_response(struct snmp_msg_pstat *m_stat) 00114 { 00115 struct snmp_varbind_root emptyvb = {NULL, NULL, 0, 0, 0}; 00116 struct pbuf *p; 00117 u16_t tot_len; 00118 err_t err; 00119 00120 /* pass 0, calculate length fields */ 00121 tot_len = snmp_varbind_list_sum(&m_stat->outvb); 00122 tot_len = snmp_resp_header_sum(m_stat, tot_len); 00123 00124 /* try allocating pbuf(s) for complete response */ 00125 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL); 00126 if (p == NULL) 00127 { 00128 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() tooBig\n")); 00129 00130 /* can't construct reply, return error-status tooBig */ 00131 m_stat->error_status = SNMP_ES_TOOBIG; 00132 m_stat->error_index = 0; 00133 /* pass 0, recalculate lengths, for empty varbind-list */ 00134 tot_len = snmp_varbind_list_sum(&emptyvb); 00135 tot_len = snmp_resp_header_sum(m_stat, tot_len); 00136 /* retry allocation once for header and empty varbind-list */ 00137 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL); 00138 } 00139 if (p != NULL) 00140 { 00141 /* first pbuf alloc try or retry alloc success */ 00142 u16_t ofs; 00143 00144 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() p != NULL\n")); 00145 00146 /* pass 1, size error, encode packet ino the pbuf(s) */ 00147 ofs = snmp_resp_header_enc(m_stat, p); 00148 if (m_stat->error_status == SNMP_ES_TOOBIG) 00149 { 00150 snmp_varbind_list_enc(&emptyvb, p, ofs); 00151 } 00152 else 00153 { 00154 snmp_varbind_list_enc(&m_stat->outvb, p, ofs); 00155 } 00156 00157 switch (m_stat->error_status) 00158 { 00159 case SNMP_ES_TOOBIG: 00160 snmp_inc_snmpouttoobigs(); 00161 break; 00162 case SNMP_ES_NOSUCHNAME: 00163 snmp_inc_snmpoutnosuchnames(); 00164 break; 00165 case SNMP_ES_BADVALUE: 00166 snmp_inc_snmpoutbadvalues(); 00167 break; 00168 case SNMP_ES_GENERROR: 00169 snmp_inc_snmpoutgenerrs(); 00170 break; 00171 } 00172 snmp_inc_snmpoutgetresponses(); 00173 snmp_inc_snmpoutpkts(); 00174 00175 /** @todo do we need separate rx and tx pcbs for threaded case? */ 00176 /** connect to the originating source */ 00177 udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp); 00178 err = udp_send(m_stat->pcb, p); 00179 if (err == ERR_MEM) 00180 { 00181 /** @todo release some memory, retry and return tooBig? tooMuchHassle? */ 00182 err = ERR_MEM; 00183 } 00184 else 00185 { 00186 err = ERR_OK; 00187 } 00188 /** disassociate remote address and port with this pcb */ 00189 udp_disconnect(m_stat->pcb); 00190 00191 pbuf_free(p); 00192 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n")); 00193 return err; 00194 } 00195 else 00196 { 00197 /* first pbuf alloc try or retry alloc failed 00198 very low on memory, couldn't return tooBig */ 00199 return ERR_MEM; 00200 } 00201 } 00202 00203 00204 /** 00205 * Sends an generic or enterprise specific trap message. 00206 * 00207 * @param generic_trap is the trap code 00208 * @param eoid points to enterprise object identifier 00209 * @param specific_trap used for enterprise traps when generic_trap == 6 00210 * @return ERR_OK when success, ERR_MEM if we're out of memory 00211 * 00212 * @note the caller is responsible for filling in outvb in the trap_msg 00213 * @note the use of the enterpise identifier field 00214 * is per RFC1215. 00215 * Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps 00216 * and .iso.org.dod.internet.private.enterprises.yourenterprise 00217 * (sysObjectID) for specific traps. 00218 */ 00219 err_t 00220 snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap) 00221 { 00222 struct snmp_trap_dst *td; 00223 struct netif *dst_if; 00224 ip_addr_t dst_ip; 00225 struct pbuf *p; 00226 u16_t i,tot_len; 00227 00228 for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++) 00229 { 00230 if ((td->enable != 0) && !ip_addr_isany(&td->dip)) 00231 { 00232 /* network order trap destination */ 00233 ip_addr_copy(trap_msg.dip, td->dip); 00234 /* lookup current source address for this dst */ 00235 dst_if = ip_route(&td->dip); 00236 ip_addr_copy(dst_ip, dst_if->ip_addr); 00237 /* @todo: what about IPv6? */ 00238 trap_msg.sip_raw[0] = ip4_addr1(&dst_ip); 00239 trap_msg.sip_raw[1] = ip4_addr2(&dst_ip); 00240 trap_msg.sip_raw[2] = ip4_addr3(&dst_ip); 00241 trap_msg.sip_raw[3] = ip4_addr4(&dst_ip); 00242 trap_msg.gen_trap = generic_trap; 00243 trap_msg.spc_trap = specific_trap; 00244 if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC) 00245 { 00246 /* enterprise-Specific trap */ 00247 trap_msg.enterprise = eoid; 00248 } 00249 else 00250 { 00251 /* generic (MIB-II) trap */ 00252 snmp_get_snmpgrpid_ptr(&trap_msg.enterprise); 00253 } 00254 snmp_get_sysuptime(&trap_msg.ts); 00255 00256 /* pass 0, calculate length fields */ 00257 tot_len = snmp_varbind_list_sum(&trap_msg.outvb); 00258 tot_len = snmp_trap_header_sum(&trap_msg, tot_len); 00259 00260 /* allocate pbuf(s) */ 00261 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL); 00262 if (p != NULL) 00263 { 00264 u16_t ofs; 00265 00266 /* pass 1, encode packet ino the pbuf(s) */ 00267 ofs = snmp_trap_header_enc(&trap_msg, p); 00268 snmp_varbind_list_enc(&trap_msg.outvb, p, ofs); 00269 00270 snmp_inc_snmpouttraps(); 00271 snmp_inc_snmpoutpkts(); 00272 00273 /** send to the TRAP destination */ 00274 udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT); 00275 00276 pbuf_free(p); 00277 } 00278 else 00279 { 00280 return ERR_MEM; 00281 } 00282 } 00283 } 00284 return ERR_OK; 00285 } 00286 00287 void 00288 snmp_coldstart_trap(void) 00289 { 00290 trap_msg.outvb.head = NULL; 00291 trap_msg.outvb.tail = NULL; 00292 trap_msg.outvb.count = 0; 00293 snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0); 00294 } 00295 00296 void 00297 snmp_authfail_trap(void) 00298 { 00299 u8_t enable; 00300 snmp_get_snmpenableauthentraps(&enable); 00301 if (enable == 1) 00302 { 00303 trap_msg.outvb.head = NULL; 00304 trap_msg.outvb.tail = NULL; 00305 trap_msg.outvb.count = 0; 00306 snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0); 00307 } 00308 } 00309 00310 /** 00311 * Sums response header field lengths from tail to head and 00312 * returns resp_header_lengths for second encoding pass. 00313 * 00314 * @param vb_len varbind-list length 00315 * @param rhl points to returned header lengths 00316 * @return the required lenght for encoding the response header 00317 */ 00318 static u16_t 00319 snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len) 00320 { 00321 u16_t tot_len; 00322 struct snmp_resp_header_lengths *rhl; 00323 00324 rhl = &m_stat->rhl; 00325 tot_len = vb_len; 00326 snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen); 00327 snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen); 00328 tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen; 00329 00330 snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen); 00331 snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen); 00332 tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen; 00333 00334 snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen); 00335 snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen); 00336 tot_len += 1 + rhl->ridlenlen + rhl->ridlen; 00337 00338 rhl->pdulen = tot_len; 00339 snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen); 00340 tot_len += 1 + rhl->pdulenlen; 00341 00342 rhl->comlen = m_stat->com_strlen; 00343 snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen); 00344 tot_len += 1 + rhl->comlenlen + rhl->comlen; 00345 00346 snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen); 00347 snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen); 00348 tot_len += 1 + rhl->verlen + rhl->verlenlen; 00349 00350 rhl->seqlen = tot_len; 00351 snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen); 00352 tot_len += 1 + rhl->seqlenlen; 00353 00354 return tot_len; 00355 } 00356 00357 /** 00358 * Sums trap header field lengths from tail to head and 00359 * returns trap_header_lengths for second encoding pass. 00360 * 00361 * @param vb_len varbind-list length 00362 * @param thl points to returned header lengths 00363 * @return the required lenght for encoding the trap header 00364 */ 00365 static u16_t 00366 snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len) 00367 { 00368 u16_t tot_len; 00369 struct snmp_trap_header_lengths *thl; 00370 00371 thl = &m_trap->thl; 00372 tot_len = vb_len; 00373 00374 snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen); 00375 snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen); 00376 tot_len += 1 + thl->tslen + thl->tslenlen; 00377 00378 snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen); 00379 snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen); 00380 tot_len += 1 + thl->strplen + thl->strplenlen; 00381 00382 snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen); 00383 snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen); 00384 tot_len += 1 + thl->gtrplen + thl->gtrplenlen; 00385 00386 thl->aaddrlen = 4; 00387 snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen); 00388 tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen; 00389 00390 snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen); 00391 snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen); 00392 tot_len += 1 + thl->eidlen + thl->eidlenlen; 00393 00394 thl->pdulen = tot_len; 00395 snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen); 00396 tot_len += 1 + thl->pdulenlen; 00397 00398 thl->comlen = sizeof(snmp_publiccommunity) - 1; 00399 snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen); 00400 tot_len += 1 + thl->comlenlen + thl->comlen; 00401 00402 snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen); 00403 snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen); 00404 tot_len += 1 + thl->verlen + thl->verlenlen; 00405 00406 thl->seqlen = tot_len; 00407 snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen); 00408 tot_len += 1 + thl->seqlenlen; 00409 00410 return tot_len; 00411 } 00412 00413 /** 00414 * Sums varbind lengths from tail to head and 00415 * annotates lengths in varbind for second encoding pass. 00416 * 00417 * @param root points to the root of the variable binding list 00418 * @return the required lenght for encoding the variable bindings 00419 */ 00420 static u16_t 00421 snmp_varbind_list_sum(struct snmp_varbind_root *root) 00422 { 00423 struct snmp_varbind *vb; 00424 u32_t *uint_ptr; 00425 s32_t *sint_ptr; 00426 u16_t tot_len; 00427 00428 tot_len = 0; 00429 vb = root->tail; 00430 while ( vb != NULL ) 00431 { 00432 /* encoded value lenght depends on type */ 00433 switch (vb->value_type) 00434 { 00435 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG): 00436 sint_ptr = (s32_t*)vb->value; 00437 snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen); 00438 break; 00439 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER): 00440 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE): 00441 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS): 00442 uint_ptr = (u32_t*)vb->value; 00443 snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen); 00444 break; 00445 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR): 00446 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL): 00447 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR): 00448 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE): 00449 vb->vlen = vb->value_len; 00450 break; 00451 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID): 00452 sint_ptr = (s32_t*)vb->value; 00453 snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen); 00454 break; 00455 default: 00456 /* unsupported type */ 00457 vb->vlen = 0; 00458 break; 00459 }; 00460 /* encoding length of value length field */ 00461 snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen); 00462 snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen); 00463 snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen); 00464 00465 vb->seqlen = 1 + vb->vlenlen + vb->vlen; 00466 vb->seqlen += 1 + vb->olenlen + vb->olen; 00467 snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen); 00468 00469 /* varbind seq */ 00470 tot_len += 1 + vb->seqlenlen + vb->seqlen; 00471 00472 vb = vb->prev; 00473 } 00474 00475 /* varbind-list seq */ 00476 root->seqlen = tot_len; 00477 snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen); 00478 tot_len += 1 + root->seqlenlen; 00479 00480 return tot_len; 00481 } 00482 00483 /** 00484 * Encodes response header from head to tail. 00485 */ 00486 static u16_t 00487 snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p) 00488 { 00489 u16_t ofs; 00490 00491 ofs = 0; 00492 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00493 ofs += 1; 00494 snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen); 00495 ofs += m_stat->rhl.seqlenlen; 00496 00497 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00498 ofs += 1; 00499 snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen); 00500 ofs += m_stat->rhl.verlenlen; 00501 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version); 00502 ofs += m_stat->rhl.verlen; 00503 00504 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)); 00505 ofs += 1; 00506 snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen); 00507 ofs += m_stat->rhl.comlenlen; 00508 snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community); 00509 ofs += m_stat->rhl.comlen; 00510 00511 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP)); 00512 ofs += 1; 00513 snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen); 00514 ofs += m_stat->rhl.pdulenlen; 00515 00516 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00517 ofs += 1; 00518 snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen); 00519 ofs += m_stat->rhl.ridlenlen; 00520 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid); 00521 ofs += m_stat->rhl.ridlen; 00522 00523 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00524 ofs += 1; 00525 snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen); 00526 ofs += m_stat->rhl.errstatlenlen; 00527 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status); 00528 ofs += m_stat->rhl.errstatlen; 00529 00530 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00531 ofs += 1; 00532 snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen); 00533 ofs += m_stat->rhl.erridxlenlen; 00534 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index); 00535 ofs += m_stat->rhl.erridxlen; 00536 00537 return ofs; 00538 } 00539 00540 /** 00541 * Encodes trap header from head to tail. 00542 */ 00543 static u16_t 00544 snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p) 00545 { 00546 u16_t ofs; 00547 00548 ofs = 0; 00549 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00550 ofs += 1; 00551 snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen); 00552 ofs += m_trap->thl.seqlenlen; 00553 00554 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00555 ofs += 1; 00556 snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen); 00557 ofs += m_trap->thl.verlenlen; 00558 snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version); 00559 ofs += m_trap->thl.verlen; 00560 00561 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)); 00562 ofs += 1; 00563 snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen); 00564 ofs += m_trap->thl.comlenlen; 00565 snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]); 00566 ofs += m_trap->thl.comlen; 00567 00568 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP)); 00569 ofs += 1; 00570 snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen); 00571 ofs += m_trap->thl.pdulenlen; 00572 00573 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)); 00574 ofs += 1; 00575 snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen); 00576 ofs += m_trap->thl.eidlenlen; 00577 snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]); 00578 ofs += m_trap->thl.eidlen; 00579 00580 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR)); 00581 ofs += 1; 00582 snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen); 00583 ofs += m_trap->thl.aaddrlenlen; 00584 snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]); 00585 ofs += m_trap->thl.aaddrlen; 00586 00587 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00588 ofs += 1; 00589 snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen); 00590 ofs += m_trap->thl.gtrplenlen; 00591 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap); 00592 ofs += m_trap->thl.gtrplen; 00593 00594 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00595 ofs += 1; 00596 snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen); 00597 ofs += m_trap->thl.strplenlen; 00598 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap); 00599 ofs += m_trap->thl.strplen; 00600 00601 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS)); 00602 ofs += 1; 00603 snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen); 00604 ofs += m_trap->thl.tslenlen; 00605 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts); 00606 ofs += m_trap->thl.tslen; 00607 00608 return ofs; 00609 } 00610 00611 /** 00612 * Encodes varbind list from head to tail. 00613 */ 00614 static u16_t 00615 snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs) 00616 { 00617 struct snmp_varbind *vb; 00618 s32_t *sint_ptr; 00619 u32_t *uint_ptr; 00620 u8_t *raw_ptr; 00621 00622 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00623 ofs += 1; 00624 snmp_asn1_enc_length(p, ofs, root->seqlen); 00625 ofs += root->seqlenlen; 00626 00627 vb = root->head; 00628 while ( vb != NULL ) 00629 { 00630 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00631 ofs += 1; 00632 snmp_asn1_enc_length(p, ofs, vb->seqlen); 00633 ofs += vb->seqlenlen; 00634 00635 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)); 00636 ofs += 1; 00637 snmp_asn1_enc_length(p, ofs, vb->olen); 00638 ofs += vb->olenlen; 00639 snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]); 00640 ofs += vb->olen; 00641 00642 snmp_asn1_enc_type(p, ofs, vb->value_type); 00643 ofs += 1; 00644 snmp_asn1_enc_length(p, ofs, vb->vlen); 00645 ofs += vb->vlenlen; 00646 00647 switch (vb->value_type) 00648 { 00649 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG): 00650 sint_ptr = (s32_t*)vb->value; 00651 snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr); 00652 break; 00653 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER): 00654 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE): 00655 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS): 00656 uint_ptr = (u32_t*)vb->value; 00657 snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr); 00658 break; 00659 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR): 00660 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR): 00661 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE): 00662 raw_ptr = (u8_t*)vb->value; 00663 snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr); 00664 break; 00665 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL): 00666 break; 00667 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID): 00668 sint_ptr = (s32_t*)vb->value; 00669 snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr); 00670 break; 00671 default: 00672 /* unsupported type */ 00673 break; 00674 }; 00675 ofs += vb->vlen; 00676 vb = vb->next; 00677 } 00678 return ofs; 00679 } 00680 00681 #endif /* LWIP_SNMP */
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