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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 struct ip_addr 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, struct ip_addr *dst) 00096 { 00097 if (dst_idx < SNMP_TRAP_DESTINATIONS) 00098 { 00099 trap_dst[dst_idx].dip.addr = htonl(dst->addr); 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 struct ip_addr 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) && (td->dip.addr != 0)) 00231 { 00232 /* network order trap destination */ 00233 trap_msg.dip.addr = td->dip.addr; 00234 /* lookup current source address for this dst */ 00235 dst_if = ip_route(&td->dip); 00236 dst_ip.addr = ntohl(dst_if->ip_addr.addr); 00237 trap_msg.sip_raw[0] = dst_ip.addr >> 24; 00238 trap_msg.sip_raw[1] = dst_ip.addr >> 16; 00239 trap_msg.sip_raw[2] = dst_ip.addr >> 8; 00240 trap_msg.sip_raw[3] = dst_ip.addr; 00241 trap_msg.gen_trap = generic_trap; 00242 trap_msg.spc_trap = specific_trap; 00243 if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC) 00244 { 00245 /* enterprise-Specific trap */ 00246 trap_msg.enterprise = eoid; 00247 } 00248 else 00249 { 00250 /* generic (MIB-II) trap */ 00251 snmp_get_snmpgrpid_ptr(&trap_msg.enterprise); 00252 } 00253 snmp_get_sysuptime(&trap_msg.ts); 00254 00255 /* pass 0, calculate length fields */ 00256 tot_len = snmp_varbind_list_sum(&trap_msg.outvb); 00257 tot_len = snmp_trap_header_sum(&trap_msg, tot_len); 00258 00259 /* allocate pbuf(s) */ 00260 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL); 00261 if (p != NULL) 00262 { 00263 u16_t ofs; 00264 00265 /* pass 1, encode packet ino the pbuf(s) */ 00266 ofs = snmp_trap_header_enc(&trap_msg, p); 00267 snmp_varbind_list_enc(&trap_msg.outvb, p, ofs); 00268 00269 snmp_inc_snmpouttraps(); 00270 snmp_inc_snmpoutpkts(); 00271 00272 /** connect to the TRAP destination */ 00273 udp_connect(trap_msg.pcb, &trap_msg.dip, SNMP_TRAP_PORT); 00274 udp_send(trap_msg.pcb, p); 00275 /** disassociate remote address and port with this pcb */ 00276 udp_disconnect(trap_msg.pcb); 00277 00278 pbuf_free(p); 00279 } 00280 else 00281 { 00282 return ERR_MEM; 00283 } 00284 } 00285 } 00286 return ERR_OK; 00287 } 00288 00289 void 00290 snmp_coldstart_trap(void) 00291 { 00292 trap_msg.outvb.head = NULL; 00293 trap_msg.outvb.tail = NULL; 00294 trap_msg.outvb.count = 0; 00295 snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0); 00296 } 00297 00298 void 00299 snmp_authfail_trap(void) 00300 { 00301 u8_t enable; 00302 snmp_get_snmpenableauthentraps(&enable); 00303 if (enable == 1) 00304 { 00305 trap_msg.outvb.head = NULL; 00306 trap_msg.outvb.tail = NULL; 00307 trap_msg.outvb.count = 0; 00308 snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0); 00309 } 00310 } 00311 00312 /** 00313 * Sums response header field lengths from tail to head and 00314 * returns resp_header_lengths for second encoding pass. 00315 * 00316 * @param vb_len varbind-list length 00317 * @param rhl points to returned header lengths 00318 * @return the required lenght for encoding the response header 00319 */ 00320 static u16_t 00321 snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len) 00322 { 00323 u16_t tot_len; 00324 struct snmp_resp_header_lengths *rhl; 00325 00326 rhl = &m_stat->rhl; 00327 tot_len = vb_len; 00328 snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen); 00329 snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen); 00330 tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen; 00331 00332 snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen); 00333 snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen); 00334 tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen; 00335 00336 snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen); 00337 snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen); 00338 tot_len += 1 + rhl->ridlenlen + rhl->ridlen; 00339 00340 rhl->pdulen = tot_len; 00341 snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen); 00342 tot_len += 1 + rhl->pdulenlen; 00343 00344 rhl->comlen = m_stat->com_strlen; 00345 snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen); 00346 tot_len += 1 + rhl->comlenlen + rhl->comlen; 00347 00348 snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen); 00349 snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen); 00350 tot_len += 1 + rhl->verlen + rhl->verlenlen; 00351 00352 rhl->seqlen = tot_len; 00353 snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen); 00354 tot_len += 1 + rhl->seqlenlen; 00355 00356 return tot_len; 00357 } 00358 00359 /** 00360 * Sums trap header field lengths from tail to head and 00361 * returns trap_header_lengths for second encoding pass. 00362 * 00363 * @param vb_len varbind-list length 00364 * @param thl points to returned header lengths 00365 * @return the required lenght for encoding the trap header 00366 */ 00367 static u16_t 00368 snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len) 00369 { 00370 u16_t tot_len; 00371 struct snmp_trap_header_lengths *thl; 00372 00373 thl = &m_trap->thl; 00374 tot_len = vb_len; 00375 00376 snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen); 00377 snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen); 00378 tot_len += 1 + thl->tslen + thl->tslenlen; 00379 00380 snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen); 00381 snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen); 00382 tot_len += 1 + thl->strplen + thl->strplenlen; 00383 00384 snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen); 00385 snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen); 00386 tot_len += 1 + thl->gtrplen + thl->gtrplenlen; 00387 00388 thl->aaddrlen = 4; 00389 snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen); 00390 tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen; 00391 00392 snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen); 00393 snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen); 00394 tot_len += 1 + thl->eidlen + thl->eidlenlen; 00395 00396 thl->pdulen = tot_len; 00397 snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen); 00398 tot_len += 1 + thl->pdulenlen; 00399 00400 thl->comlen = sizeof(snmp_publiccommunity) - 1; 00401 snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen); 00402 tot_len += 1 + thl->comlenlen + thl->comlen; 00403 00404 snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen); 00405 snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen); 00406 tot_len += 1 + thl->verlen + thl->verlenlen; 00407 00408 thl->seqlen = tot_len; 00409 snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen); 00410 tot_len += 1 + thl->seqlenlen; 00411 00412 return tot_len; 00413 } 00414 00415 /** 00416 * Sums varbind lengths from tail to head and 00417 * annotates lengths in varbind for second encoding pass. 00418 * 00419 * @param root points to the root of the variable binding list 00420 * @return the required lenght for encoding the variable bindings 00421 */ 00422 static u16_t 00423 snmp_varbind_list_sum(struct snmp_varbind_root *root) 00424 { 00425 struct snmp_varbind *vb; 00426 u32_t *uint_ptr; 00427 s32_t *sint_ptr; 00428 u16_t tot_len; 00429 00430 tot_len = 0; 00431 vb = root->tail; 00432 while ( vb != NULL ) 00433 { 00434 /* encoded value lenght depends on type */ 00435 switch (vb->value_type) 00436 { 00437 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG): 00438 sint_ptr = vb->value; 00439 snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen); 00440 break; 00441 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER): 00442 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE): 00443 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS): 00444 uint_ptr = vb->value; 00445 snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen); 00446 break; 00447 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR): 00448 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL): 00449 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR): 00450 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE): 00451 vb->vlen = vb->value_len; 00452 break; 00453 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID): 00454 sint_ptr = vb->value; 00455 snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen); 00456 break; 00457 default: 00458 /* unsupported type */ 00459 vb->vlen = 0; 00460 break; 00461 }; 00462 /* encoding length of value length field */ 00463 snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen); 00464 snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen); 00465 snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen); 00466 00467 vb->seqlen = 1 + vb->vlenlen + vb->vlen; 00468 vb->seqlen += 1 + vb->olenlen + vb->olen; 00469 snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen); 00470 00471 /* varbind seq */ 00472 tot_len += 1 + vb->seqlenlen + vb->seqlen; 00473 00474 vb = vb->prev; 00475 } 00476 00477 /* varbind-list seq */ 00478 root->seqlen = tot_len; 00479 snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen); 00480 tot_len += 1 + root->seqlenlen; 00481 00482 return tot_len; 00483 } 00484 00485 /** 00486 * Encodes response header from head to tail. 00487 */ 00488 static u16_t 00489 snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p) 00490 { 00491 u16_t ofs; 00492 00493 ofs = 0; 00494 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00495 ofs += 1; 00496 snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen); 00497 ofs += m_stat->rhl.seqlenlen; 00498 00499 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00500 ofs += 1; 00501 snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen); 00502 ofs += m_stat->rhl.verlenlen; 00503 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version); 00504 ofs += m_stat->rhl.verlen; 00505 00506 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)); 00507 ofs += 1; 00508 snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen); 00509 ofs += m_stat->rhl.comlenlen; 00510 snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community); 00511 ofs += m_stat->rhl.comlen; 00512 00513 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP)); 00514 ofs += 1; 00515 snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen); 00516 ofs += m_stat->rhl.pdulenlen; 00517 00518 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00519 ofs += 1; 00520 snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen); 00521 ofs += m_stat->rhl.ridlenlen; 00522 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid); 00523 ofs += m_stat->rhl.ridlen; 00524 00525 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00526 ofs += 1; 00527 snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen); 00528 ofs += m_stat->rhl.errstatlenlen; 00529 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status); 00530 ofs += m_stat->rhl.errstatlen; 00531 00532 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00533 ofs += 1; 00534 snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen); 00535 ofs += m_stat->rhl.erridxlenlen; 00536 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index); 00537 ofs += m_stat->rhl.erridxlen; 00538 00539 return ofs; 00540 } 00541 00542 /** 00543 * Encodes trap header from head to tail. 00544 */ 00545 static u16_t 00546 snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p) 00547 { 00548 u16_t ofs; 00549 00550 ofs = 0; 00551 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00552 ofs += 1; 00553 snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen); 00554 ofs += m_trap->thl.seqlenlen; 00555 00556 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00557 ofs += 1; 00558 snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen); 00559 ofs += m_trap->thl.verlenlen; 00560 snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version); 00561 ofs += m_trap->thl.verlen; 00562 00563 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)); 00564 ofs += 1; 00565 snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen); 00566 ofs += m_trap->thl.comlenlen; 00567 snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]); 00568 ofs += m_trap->thl.comlen; 00569 00570 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP)); 00571 ofs += 1; 00572 snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen); 00573 ofs += m_trap->thl.pdulenlen; 00574 00575 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)); 00576 ofs += 1; 00577 snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen); 00578 ofs += m_trap->thl.eidlenlen; 00579 snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]); 00580 ofs += m_trap->thl.eidlen; 00581 00582 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR)); 00583 ofs += 1; 00584 snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen); 00585 ofs += m_trap->thl.aaddrlenlen; 00586 snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]); 00587 ofs += m_trap->thl.aaddrlen; 00588 00589 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00590 ofs += 1; 00591 snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen); 00592 ofs += m_trap->thl.gtrplenlen; 00593 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap); 00594 ofs += m_trap->thl.gtrplen; 00595 00596 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)); 00597 ofs += 1; 00598 snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen); 00599 ofs += m_trap->thl.strplenlen; 00600 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap); 00601 ofs += m_trap->thl.strplen; 00602 00603 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS)); 00604 ofs += 1; 00605 snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen); 00606 ofs += m_trap->thl.tslenlen; 00607 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts); 00608 ofs += m_trap->thl.tslen; 00609 00610 return ofs; 00611 } 00612 00613 /** 00614 * Encodes varbind list from head to tail. 00615 */ 00616 static u16_t 00617 snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs) 00618 { 00619 struct snmp_varbind *vb; 00620 s32_t *sint_ptr; 00621 u32_t *uint_ptr; 00622 u8_t *raw_ptr; 00623 00624 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00625 ofs += 1; 00626 snmp_asn1_enc_length(p, ofs, root->seqlen); 00627 ofs += root->seqlenlen; 00628 00629 vb = root->head; 00630 while ( vb != NULL ) 00631 { 00632 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)); 00633 ofs += 1; 00634 snmp_asn1_enc_length(p, ofs, vb->seqlen); 00635 ofs += vb->seqlenlen; 00636 00637 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)); 00638 ofs += 1; 00639 snmp_asn1_enc_length(p, ofs, vb->olen); 00640 ofs += vb->olenlen; 00641 snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]); 00642 ofs += vb->olen; 00643 00644 snmp_asn1_enc_type(p, ofs, vb->value_type); 00645 ofs += 1; 00646 snmp_asn1_enc_length(p, ofs, vb->vlen); 00647 ofs += vb->vlenlen; 00648 00649 switch (vb->value_type) 00650 { 00651 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG): 00652 sint_ptr = vb->value; 00653 snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr); 00654 break; 00655 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER): 00656 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE): 00657 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS): 00658 uint_ptr = vb->value; 00659 snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr); 00660 break; 00661 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR): 00662 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR): 00663 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE): 00664 raw_ptr = vb->value; 00665 snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr); 00666 break; 00667 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL): 00668 break; 00669 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID): 00670 sint_ptr = vb->value; 00671 snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr); 00672 break; 00673 default: 00674 /* unsupported type */ 00675 break; 00676 }; 00677 ofs += vb->vlen; 00678 vb = vb->next; 00679 } 00680 return ofs; 00681 } 00682 00683 #endif /* LWIP_SNMP */
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