int snmp_preview(u_char *data, unsigned length, struct SnmpObjects *vbinds)
{
int i = 0; /* number of varbinds parsed */
unsigned tmp;
struct SnmpObject *obj;
vbinds->num=0; /* number of varbinds present in vbinds */
while (length)
{
/* parse the name, value pair */
obj = &(vbinds->objs[i]);
obj->namelen = MAX_NAME_LEN;
data = snmp_parse_var_op(data, obj->name, &obj->namelen,
&obj->valuetype, &obj->valuelen, &obj->value, &length);
if (data == NULL)
return -1;
/* obj->value points to ASN encoded value
* - skip past "type" and "len" fields, so that "value"
* points to received value.
*/
tmp = data - obj->value;
obj->value = asn_parse_header(obj->value, &tmp, &obj->valuetype);
if (obj->value == NULL)
return -1;
i++;
/* test which verifies that SET command contains valid VB ammount */
if((i >= SNMP_MAX_OIDS) && (length > 0))
return -1 ;
}
vbinds->num=i; /* number of varbinds present in vbinds */
return 0;
}
//*
//*---------------------------------------------------------------------------------
//* Function Name: snmp_parse_auth
//* Description : Get the community name and version number by parsing snmp
//* message. The message is decoded in BER deconding rules.
//* Return Value : Community Name and its length, version number and new pointer to
//* next snmp fields
//* Calling To : asn_parse_header, asn_parse_int, asn_parse_string
//* Called By : snmp_parse
//*---------------------------------------------------------------------------------
//*
uint8 *snmp_parse_auth(
uint8 *data,
int *length,
uint8 *community,
int *community_len,
long *version
)
{
uint8 type;
data = asn_parse_header(data, length, &type);
if (data == NULL) {
return (NULL); //------SNMP: Parse authority failure.
}
if (type != (ASN_SEQUENCE | ASN_CONSTRUCTOR))
return (NULL); //------SNMP: Wrong auth header type.
data = asn_parse_int(data, length, &type, version, sizeof(*version));
if (data == NULL)
return (NULL); //------SNMP: Bad parse of version.
data = asn_parse_string(data, length, &type, community, community_len);
if (data == NULL)
return (NULL); //------SNMP: Bad parse of community.
community[*community_len] = '\0';
return (data);
}
//*
//* create a packet identical to the input packet, except for the error status
//* and the error index which are set according to the input variables.
//* Returns 1 upon success and 0 upon failure.
//*
int
create_identical(
snmp_session *session,
uint8 *snmp_in,
uint8 *snmp_out,
int snmp_length,
long errstat,
long errindex
)
{
uint8 *data;
uint8 type;
uint32 dummy;
uint8 *headerPtr, *reqidPtr, *errstatPtr, *errindexPtr, *varListPtr;
int headerLength, length;
bcopy((char *)snmp_in, (char *)snmp_out, snmp_length);
length = snmp_length;
headerPtr = snmp_parse_auth(snmp_out, &length, community, &session->community_len, (long *)&dummy);
community[session->community_len] = 0;
if (headerPtr == NULL) return 0;
reqidPtr = asn_parse_header(headerPtr, &length, (uint8 *)&dummy);
if (reqidPtr == NULL)
return 0;
headerLength = length;
errstatPtr = asn_parse_int(reqidPtr, &length, &type, (long *)&dummy, sizeof dummy); // request id
if (errstatPtr == NULL)
return 0;
errindexPtr = asn_parse_int(errstatPtr, &length, &type, (long *)&dummy, sizeof dummy); // error status
if (errindexPtr == NULL)
return 0;
varListPtr = asn_parse_int(errindexPtr, &length, &type, (long *)&dummy, sizeof dummy); // error index
if (varListPtr == NULL)
return 0;
#if 0
data = asn_build_header(headerPtr, &headerLength, GET_RSP_MSG, headerLength);
if (data != reqidPtr)
return 0;
#else
/*bug fixed */
*headerPtr = GET_RSP_MSG;
#endif
length = snmp_length;
type = (uint8)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_INTEGER);
data = asn_build_int(errstatPtr, &length, type, &errstat, sizeof errstat);
if (data != errindexPtr)
return 0;
data = asn_build_int(errindexPtr, &length, type, &errindex, sizeof errindex);
if (data != varListPtr)
return 0;
packet_end = snmp_out + snmp_length;
return 1;
}
u_char *
snmp_msg_Decode(u_char * Packet, int *PacketLenP,
u_char * Community, int *CommLenP,
int *Version, struct snmp_pdu * PDU)
{
u_char *bufp;
u_char type;
bufp = asn_parse_header(Packet, PacketLenP, &type);
if (bufp == NULL) {
snmplib_debug(4, "snmp_msg_Decode:Error decoding SNMP Message Header (Header)!\n");
ASN_PARSE_ERROR(NULL);
}
if (type != (ASN_SEQUENCE | ASN_CONSTRUCTOR)) {
snmplib_debug(4, "snmp_msg_Decode:Error decoding SNMP Message Header (Header)!\n");
ASN_PARSE_ERROR(NULL);
}
bufp = asn_parse_int(bufp, PacketLenP,
&type,
(int *) Version, sizeof(*Version));
if (bufp == NULL) {
snmplib_debug(4, "snmp_msg_Decode:Error decoding SNMP Message Header (Version)!\n");
ASN_PARSE_ERROR(NULL);
}
bufp = asn_parse_string(bufp, PacketLenP, &type, Community, CommLenP);
if (bufp == NULL) {
snmplib_debug(4, "snmp_msg_Decode:Error decoding SNMP Message Header (Community)!\n");
ASN_PARSE_ERROR(NULL);
}
Community[*CommLenP] = '\0';
if ((*Version != SNMP_VERSION_1) &&
(*Version != SNMP_VERSION_2)) {
/* Don't know how to handle this one. */
snmplib_debug(4, "snmp_msg_Decode:Unable to parse Version %u\n", *Version);
snmplib_debug(4, "snmp_msg_Decode:Continuing anyway\n");
}
/* Now that we know the header, decode the PDU */
/* XXXXX -- More than one PDU? */
bufp = snmp_pdu_decode(bufp, PacketLenP, PDU);
if (bufp == NULL)
/* snmp_pdu_decode registered failure */
return (NULL);
bufp = snmp_var_DecodeVarBind(bufp, PacketLenP, &(PDU->variables), *Version);
if (bufp == NULL)
/* snmp_var_DecodeVarBind registered failure */
return (NULL);
return (u_char *) bufp;
}
// Tests if the given buffer contains a SNMPv3-Message.
bool v3MP::is_v3_msg(unsigned char *buffer, int length)
{
unsigned char type;
long version;
// get the type
buffer = asn_parse_header(buffer, &length, &type);
if (!buffer)
{
LOG_BEGIN(loggerModuleName, WARNING_LOG | 1);
LOG("Testing for v3 message: Bad header");
LOG_END;
return false;
}
if (type != ASN_SEQ_CON)
{
LOG_BEGIN(loggerModuleName, WARNING_LOG | 1);
LOG("Testing for v3 message: Wrong auth header type");
LOG((int)type);
LOG_END;
return false;
}
// get the version
buffer = asn_parse_int(buffer, &length, &type, &version);
if (!buffer)
{
LOG_BEGIN(loggerModuleName, WARNING_LOG | 1);
LOG("Testing for v3 message: Bad parse of version");
LOG_END;
return 0;
}
return (version == SNMP_VERSION_3);
}
u_char *
snmp_parse_var_op(u_char *data,
oid *var_name,
size_t *var_name_len,
u_char *var_val_type,
size_t *var_val_len,
u_char **var_val,
size_t *listlength)
{
u_char var_op_type;
size_t var_op_len = *listlength;
u_char *var_op_start = data;
data = asn_parse_sequence(data, &var_op_len, &var_op_type,
(ASN_SEQUENCE | ASN_CONSTRUCTOR), "var_op");
if (data == NULL) {
/* msg detail is set */
return NULL;
}
data = asn_parse_objid(data, &var_op_len, &var_op_type, var_name, var_name_len);
if (data == NULL) {
ERROR_MSG("No OID for variable");
return NULL;
}
if (var_op_type != (u_char)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID))
return NULL;
*var_val = data; /* save pointer to this object */
/* find out what type of object this is */
data = asn_parse_header(data, &var_op_len, var_val_type);
if (data == NULL) {
ERROR_MSG("No header for value");
return NULL;
}
/* XXX no check for type! */
*var_val_len = var_op_len;
data += var_op_len;
*listlength -= (int)(data - var_op_start);
return data;
}
/* Parse SMUX message. */
int
smux_parse (char *ptr, size_t len)
{
/* This buffer we'll use for SOUT message. We could allocate it with
malloc and save only static pointer/lenght, but IMHO static
buffer is a faster solusion. */
static u_char sout_save_buff[SMUXMAXPKTSIZE];
static int sout_save_len = 0;
int len_income = len; /* see note below: YYY */
u_char type;
u_char rollback;
rollback = ptr[2]; /* important only for SMUX_SOUT */
process_rest: /* see note below: YYY */
/* Parse SMUX message type and subsequent length. */
ptr = asn_parse_header (ptr, &len, &type);
if (debug_smux)
zlog_debug ("SMUX message received type: %d rest len: %ld", type, len);
switch (type)
{
case SMUX_OPEN:
/* Open must be not send from SNMP agent. */
zlog_warn ("SMUX_OPEN received: resetting connection.");
return -1;
break;
case SMUX_RREQ:
/* SMUX_RREQ message is invalid for us. */
zlog_warn ("SMUX_RREQ received: resetting connection.");
return -1;
break;
case SMUX_SOUT:
/* SMUX_SOUT message is now valied for us. */
if (debug_smux)
zlog_debug ("SMUX_SOUT(%s)", rollback ? "rollback" : "commit");
if (sout_save_len > 0)
{
smux_parse_set (sout_save_buff, sout_save_len, rollback ? FREE : COMMIT);
sout_save_len = 0;
}
else
zlog_warn ("SMUX_SOUT sout_save_len=%d - invalid", (int) sout_save_len);
if (len_income > 3)
{
/* YYY: this strange code has to solve the "slow peer"
problem: When agent sends SMUX_SOUT message it doesn't
wait any responce and may send some next message to
subagent. Then the peer in 'smux_read()' will recieve
from socket the 'concatenated' buffer, contaning both
SMUX_SOUT message and the next one
(SMUX_GET/SMUX_GETNEXT/SMUX_GET). So we should check: if
the buffer is longer than 3 ( length of SMUX_SOUT ), we
must process the rest of it. This effect may be observed
if 'debug_smux' is set to '1' */
ptr++;
len = len_income - 3;
goto process_rest;
}
break;
case SMUX_GETRSP:
/* SMUX_GETRSP message is invalid for us. */
zlog_warn ("SMUX_GETRSP received: resetting connection.");
return -1;
break;
case SMUX_CLOSE:
/* Close SMUX connection. */
if (debug_smux)
zlog_debug ("SMUX_CLOSE");
smux_parse_close (ptr, len);
return -1;
break;
case SMUX_RRSP:
/* This is response for register message. */
if (debug_smux)
zlog_debug ("SMUX_RRSP");
smux_parse_rrsp (ptr, len);
break;
case SMUX_GET:
/* Exact request for object id. */
if (debug_smux)
zlog_debug ("SMUX_GET");
smux_parse_get (ptr, len, 1);
break;
case SMUX_GETNEXT:
/* Next request for object id. */
if (debug_smux)
zlog_debug ("SMUX_GETNEXT");
smux_parse_get (ptr, len, 0);
break;
case SMUX_SET:
/* SMUX_SET is supported with some limitations. */
if (debug_smux)
zlog_debug ("SMUX_SET");
/* save the data for future SMUX_SOUT */
memcpy (sout_save_buff, ptr, len);
sout_save_len = len;
smux_parse_set (ptr, len, RESERVE1);
break;
default:
zlog_info ("Unknown type: %d", type);
break;
}
return 0;
}
char *
smux_var (char *ptr, size_t len, oid objid[], size_t *objid_len,
size_t *var_val_len,
u_char *var_val_type,
void **var_value)
{
u_char type;
u_char val_type;
size_t val_len;
u_char *val;
if (debug_smux)
zlog_debug ("SMUX var parse: len %ld", len);
/* Parse header. */
ptr = asn_parse_header (ptr, &len, &type);
if (debug_smux)
{
zlog_debug ("SMUX var parse: type %d len %ld", type, len);
zlog_debug ("SMUX var parse: type must be %d",
(ASN_SEQUENCE | ASN_CONSTRUCTOR));
}
/* Parse var option. */
*objid_len = MAX_OID_LEN;
ptr = snmp_parse_var_op(ptr, objid, objid_len, &val_type,
&val_len, &val, &len);
if (var_val_len)
*var_val_len = val_len;
if (var_value)
*var_value = (void*) val;
if (var_val_type)
*var_val_type = val_type;
/* Requested object id length is objid_len. */
if (debug_smux)
smux_oid_dump ("Request OID", objid, *objid_len);
if (debug_smux)
zlog_debug ("SMUX val_type: %d", val_type);
/* Check request value type. */
if (debug_smux)
switch (val_type)
{
case ASN_NULL:
/* In case of SMUX_GET or SMUX_GET_NEXT val_type is set to
ASN_NULL. */
zlog_debug ("ASN_NULL");
break;
case ASN_INTEGER:
zlog_debug ("ASN_INTEGER");
break;
case ASN_COUNTER:
case ASN_GAUGE:
case ASN_TIMETICKS:
case ASN_UINTEGER:
zlog_debug ("ASN_COUNTER");
break;
case ASN_COUNTER64:
zlog_debug ("ASN_COUNTER64");
break;
case ASN_IPADDRESS:
zlog_debug ("ASN_IPADDRESS");
break;
case ASN_OCTET_STR:
zlog_debug ("ASN_OCTET_STR");
break;
case ASN_OPAQUE:
case ASN_NSAP:
case ASN_OBJECT_ID:
zlog_debug ("ASN_OPAQUE");
break;
case SNMP_NOSUCHOBJECT:
zlog_debug ("SNMP_NOSUCHOBJECT");
break;
case SNMP_NOSUCHINSTANCE:
zlog_debug ("SNMP_NOSUCHINSTANCE");
break;
case SNMP_ENDOFMIBVIEW:
zlog_debug ("SNMP_ENDOFMIBVIEW");
break;
case ASN_BIT_STR:
zlog_debug ("ASN_BIT_STR");
break;
default:
zlog_debug ("Unknown type");
break;
}
return ptr;
}
// Parse the given buffer as a SNMPv3-Message.
int v3MP::snmp_parse(Snmp *snmp_session,
struct snmp_pdu *pdu,
unsigned char *inBuf,
int inBufLength,
OctetStr &securityEngineID,
OctetStr &securityName,
OctetStr &contextEngineID,
OctetStr &contextName,
long &securityLevel,
long &msgSecurityModel,
snmp_version &spp_version,
UdpAddress from_address)
{
debugprintf(3, "mp is parsing incoming message:");
debughexprintf(25, inBuf, inBufLength);
if (inBufLength > MAX_SNMP_PACKET)
return SNMPv3_MP_ERROR;
unsigned char type;
long version;
int origLength = inBufLength;
unsigned char *inBufPtr = inBuf;
long msgID, msgMaxSize;
unsigned char msgFlags;
Buffer<unsigned char> msgSecurityParameters(MAX_SNMP_PACKET);
Buffer<unsigned char> msgData(MAX_SNMP_PACKET);
int msgSecurityParametersLength = inBufLength, msgDataLength = inBufLength;
Buffer<unsigned char> scopedPDU(MAX_SNMP_PACKET);
int scopedPDULength = MAX_SNMP_PACKET;
long maxSizeResponseScopedPDU = 0;
struct SecurityStateReference *securityStateReference = NULL;
int securityParametersPosition;
int rc;
int errorCode = 0;
// get the type
inBuf = asn_parse_header( inBuf, &inBufLength, &type);
if (inBuf == NULL){
debugprintf(0, "snmp_parse: bad header");
return SNMPv3_MP_PARSE_ERROR;
}
if (type != (ASN_SEQ_CON)){
debugprintf(0, "snmp_parse: wrong auth header type");
return SNMPv3_MP_PARSE_ERROR;
}
if (origLength != inBufLength + (inBuf - inBufPtr)) {
debugprintf(0, "snmp_parse: wrong length of received packet");
return SNMPv3_MP_PARSE_ERROR;
}
// get the version
inBuf = asn_parse_int(inBuf, &inBufLength, &type, &version);
if (inBuf == NULL){
debugprintf(0, "snmp_parse: bad parse of version");
return SNMPv3_MP_PARSE_ERROR;
}
debugprintf(3, "Parsed length(%x), version(0x%lx)", inBufLength, version);
if ( version != SNMP_VERSION_3 )
return SNMPv3_MP_PARSE_ERROR;
spp_version = (snmp_version) version;
inBuf = asn1_parse_header_data(inBuf, &inBufLength,
&msgID, &msgMaxSize,
&msgFlags, &msgSecurityModel);
if (inBuf == NULL){
debugprintf(0, "snmp_parse: bad parse of msgHeaderData");
return SNMPv3_MP_PARSE_ERROR;
}
pdu->msgid = msgID;
if ((msgMaxSize < 484) || (msgMaxSize > 0x7FFFFFFF)) {
debugprintf(0, "snmp_parse: bad parse of msgMaxSize");
return SNMPv3_MP_PARSE_ERROR;
}
// do not allow larger messages than this entity can handle
if (msgMaxSize > MAX_SNMP_PACKET) msgMaxSize = MAX_SNMP_PACKET;
pdu->maxsize_scopedpdu = msgMaxSize;
inBuf = asn_parse_string( inBuf, &inBufLength, &type,
msgSecurityParameters.get_ptr(),
&msgSecurityParametersLength);
if (inBuf == NULL){
debugprintf(0, "snmp_parse: bad parse of msgSecurityParameters");
return SNMPv3_MP_PARSE_ERROR;
}
securityParametersPosition= SAFE_INT_CAST(inBuf - inBufPtr) - msgSecurityParametersLength;
// the rest of the message is passed directly to the security module
msgDataLength = origLength - SAFE_INT_CAST(inBuf - inBufPtr);
memcpy(msgData.get_ptr(), inBuf, msgDataLength);
debugprintf(3, "Parsed msgdata length(0x%x), "
"msgSecurityParameters length(0x%x)", msgDataLength,
msgSecurityParametersLength);
switch (msgFlags & 0x03) {
case 3: { securityLevel = SNMP_SECURITY_LEVEL_AUTH_PRIV; break;}
case 0: { securityLevel = SNMP_SECURITY_LEVEL_NOAUTH_NOPRIV; break;}
case 1: { securityLevel = SNMP_SECURITY_LEVEL_AUTH_NOPRIV; break;}
default: { securityLevel = SNMP_SECURITY_LEVEL_NOAUTH_NOPRIV;
snmpInvalidMsgs++;
// do not send back report
return SNMPv3_MP_INVALID_MESSAGE;
break;
}
}
bool reportableFlag;
if (msgFlags & 0x04) reportableFlag = true;
else reportableFlag = false;
securityStateReference = usm->get_new_sec_state_reference();
if (!securityStateReference)
return SNMPv3_MP_ERROR;
switch (msgSecurityModel) {
case SNMP_SECURITY_MODEL_USM:
{
rc = usm->process_msg(
msgMaxSize,
msgSecurityParameters.get_ptr(),
msgSecurityParametersLength,
securityParametersPosition,
securityLevel,
inBufPtr, origLength, //wholeMsg
msgData.get_ptr(), msgDataLength,
securityEngineID,
securityName,
scopedPDU.get_ptr(), &scopedPDULength,
&maxSizeResponseScopedPDU,
securityStateReference,
from_address);
pdu->maxsize_scopedpdu = maxSizeResponseScopedPDU;
if (rc != SNMPv3_USM_OK) {
if (rc == SNMPv3_USM_NOT_IN_TIME_WINDOW) {
errorCode = SNMPv3_MP_NOT_IN_TIME_WINDOW;
}
else {
// error handling! rfc2262 page 31
debugprintf(0, "mp: error while executing USM::process_msg");
errorCode = rc;
}
}
if (errorCode != SNMPv3_USM_PARSE_ERROR)
if (securityEngineID.len() == 0)
errorCode = SNMPv3_MP_INVALID_ENGINEID;
break;
}
default: {
snmpUnknownSecurityModels++;
usm->delete_sec_state_reference(securityStateReference);
debugprintf(0, "SecurityModel of incomming Message not supported!");
// Message should be dropped without a report
return SNMPv3_MP_UNSUPPORTED_SECURITY_MODEL;
}
}
// process scopedPDU
debughexcprintf(21, "scoped PDU", scopedPDU.get_ptr(), scopedPDULength);
unsigned char *scopedPDUPtr= scopedPDU.get_ptr();
unsigned char tmp_contextEngineID[MAXLENGTH_ENGINEID];
unsigned char tmp_contextName[MAXLENGTH_CONTEXT_NAME];
int tmp_contextEngineIDLength = MAXLENGTH_ENGINEID;
int tmp_contextNameLength = MAXLENGTH_CONTEXT_NAME;
unsigned char *data;
int dataLength;
debugprintf(1,"ErrorCode is %i",errorCode);
if (!errorCode) {
data = asn1_parse_scoped_pdu(scopedPDUPtr, &scopedPDULength,
tmp_contextEngineID,
&tmp_contextEngineIDLength,
tmp_contextName, &tmp_contextNameLength);
if (data == NULL) {
debugprintf(0, "mp: Error Parsing scopedPDU!");
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_PARSE_ERROR;
}
dataLength = scopedPDULength;
contextEngineID.set_data(tmp_contextEngineID, tmp_contextEngineIDLength);
contextName.set_data(tmp_contextName, tmp_contextNameLength);
// parse data of scopedPDU
if (snmp_parse_data_pdu(pdu, data, dataLength) != SNMP_CLASS_SUCCESS) {
debugprintf(0, "mp: Error parsing PDU!");
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_PARSE_ERROR;
}
if (SNMP_CLASS_SUCCESS != snmp_parse_vb(pdu, data, dataLength)) {
debugprintf(0, "mp: Error parsing Vb");
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_PARSE_ERROR;
}
if ((tmp_contextEngineIDLength == 0) &&
((pdu->command == GET_REQ_MSG) || (pdu->command == GETNEXT_REQ_MSG) ||
(pdu->command == SET_REQ_MSG) || (pdu->command == GETBULK_REQ_MSG) ||
(pdu->command == TRP_REQ_MSG) || (pdu->command == INFORM_REQ_MSG) ||
(pdu->command == TRP2_REQ_MSG)))
{
// RFC 2572 � 4.2.2.1 (2a)
debugprintf(2, "mp: received request message with zero length"
" contextEngineID -> unknownPduHandlers.");
inc_stats_unknown_pdu_handlers();
errorCode = SNMPv3_MP_UNKNOWN_PDU_HANDLERS;
}
}
if (errorCode) {
if ((reportableFlag) && (errorCode != SNMPv3_USM_PARSE_ERROR)) {
// error occured: prepare reportpdu in agent
cache.add_entry(msgID, pdu->reqid, securityEngineID,
msgSecurityModel,
securityName, securityLevel, "", "",
securityStateReference, errorCode, CACHE_REMOTE_REQ);
send_report(scopedPDUPtr, scopedPDULength, pdu, errorCode,
securityLevel, msgSecurityModel, securityName,
from_address, snmp_session);
clear_pdu(pdu, true); // Clear pdu and free all content AND IDs!
}
else {
usm->delete_sec_state_reference(securityStateReference);
}
return errorCode;
}
struct Cache::Entry_T centry;
if ((pdu->command == GET_RSP_MSG) || (pdu->command == REPORT_MSG)) {
rc = cache.get_entry(msgID, true, ¢ry);
if (rc != SNMPv3_MP_OK) {
// RFC 2572 � 4
debugprintf(2, "Received rspMsg without outstanding request."
" -> SnmpUnknownPduHandler");
usm->delete_sec_state_reference(securityStateReference);
inc_stats_unknown_pdu_handlers();
return SNMPv3_MP_UNKNOWN_PDU_HANDLERS;
}
if (((pdu->reqid == 0) || (pdu->reqid == 0x7fffffff))
&& (pdu->command == REPORT_MSG))
pdu->reqid = centry.req_id;
#ifdef BUGGY_REPORT_REQID
if ((pdu->reqid != centry.req_id) && (pdu->command == REPORT_MSG))
{
debugprintf(0, "WARNING: setting reqid of REPORT PDU (from) (to): (%ld) (%ld)", pdu->reqid, centry.req_id);
pdu->reqid = centry.req_id;
}
#endif
}
if (pdu->command == REPORT_MSG) {
// !! rfc2262 page 33
debugprintf(2, "*** Receiving a ReportPDU ***");
if (/*((securityEngineID != centry.sec_engine_id)
&& (centry.sec_engine_id.len() != 0)) ||*/
((msgSecurityModel != centry.sec_model)
&& (msgSecurityModel != SNMP_SECURITY_MODEL_USM)) ||
((securityName != centry.sec_name)
&& (securityName.len() != 0)))
{
debugprintf(0, "Received report message doesn't match sent message!");
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_MATCH_ERROR;
}
usm->delete_sec_state_reference(securityStateReference);
cache.delete_content(centry);
debugprintf(1, "mp finished (OK)");
return SNMPv3_MP_OK;
}
if (pdu->command == GET_RSP_MSG) {
if (((securityEngineID != centry.sec_engine_id)
&& (centry.sec_engine_id.len() != 0)) ||
(msgSecurityModel != centry.sec_model) ||
(securityName != centry.sec_name) ||
(securityLevel != centry.sec_level) ||
((contextEngineID != centry.context_engine_id)
&& (centry.context_engine_id.len() != 0))||
((contextName != centry.context_name)
&& (centry.context_name.len() != 0))) {
debugprintf(0, "Received response message doesn't match sent message!");
usm->delete_sec_state_reference(securityStateReference);
cache.delete_content(centry);
return SNMPv3_MP_MATCH_ERROR;
}
usm->delete_sec_state_reference(securityStateReference);
cache.delete_content(centry);
debugprintf(1, "mp finished (OK)");
return SNMPv3_MP_OK;
}
if ((pdu->command == GET_REQ_MSG) || (pdu->command == GETNEXT_REQ_MSG) ||
(pdu->command == SET_REQ_MSG) || (pdu->command == GETBULK_REQ_MSG) ||
(pdu->command == INFORM_REQ_MSG)) {
if (securityEngineID.len() == 0) {
debugprintf(2, "Received Message with engineID = 0.");
}
else {
if (!(unsignedCharCompare(securityEngineID.data(), securityEngineID.len(),
own_engine_id, own_engine_id_len))) {
debugprintf(0, "snmp_parse: securityEngineID doesn't match own_engine_id.");
/* we are authoritative but engine id of message is wrong
if discovery in USM is enabled:
- remove automatically added illegal engine id from USM tables
- send a report
*/
if (usm->is_discovery_enabled())
{
// TODO: try to remove engine id from USM
if (reportableFlag)
{
cache.add_entry(msgID, pdu->reqid, securityEngineID,
msgSecurityModel,
securityName, securityLevel, "", "",
securityStateReference,
SNMPv3_MP_INVALID_ENGINEID,
CACHE_REMOTE_REQ);
send_report(0, MAX_SNMP_PACKET, pdu, SNMPv3_MP_INVALID_ENGINEID,
SNMP_SECURITY_LEVEL_NOAUTH_NOPRIV, msgSecurityModel,
securityName, from_address, snmp_session);
clear_pdu(pdu, true); // Clear pdu and free all content AND IDs!
}
else
{
usm->delete_sec_state_reference(securityStateReference);
}
return SNMPv3_MP_INVALID_ENGINEID;
}
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_MATCH_ERROR;
}
}
int ret = cache.add_entry(msgID, pdu->reqid, securityEngineID,
msgSecurityModel, securityName,
securityLevel, contextEngineID,
contextName, securityStateReference,
SNMPv3_MP_OK, CACHE_REMOTE_REQ);
if (ret == SNMPv3_MP_DOUBLED_MESSAGE) {
debugprintf(0, "*** received doubled message ***");
// message will be ignored so return OK
usm->delete_sec_state_reference(securityStateReference);
}
debugprintf(1, "mp: parsing finished (ok).");
return SNMPv3_MP_OK;
}
if ((pdu->command == TRP_REQ_MSG) || (pdu->command == TRP2_REQ_MSG))
{
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_OK;
}
debugprintf(0, "mp error: This line should not be executed.");
usm->delete_sec_state_reference(securityStateReference);
return SNMPv3_MP_ERROR;
}
/* Parse all Vars from the buffer */
u_char *snmp_var_DecodeVarBind(u_char *Buffer, int *BufLen,
struct variable_list **VarP,
int Version)
{
struct variable_list *Var, **VarLastP;
u_char *bufp, *tmp;
u_char VarBindType;
u_char *DataPtr;
int DataLen;
oid TmpBuf[MAX_NAME_LEN];
int AllVarLen = *BufLen;
int ThisVarLen = 0;
VarLastP = VarP;
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoding buffer of length %d\n", *BufLen);
#endif
/* Now parse the variables */
bufp = asn_parse_header(Buffer, &AllVarLen, &VarBindType);
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
if (VarBindType != (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR)) {
snmp_set_api_error(SNMPERR_PDU_PARSE);
ASN_PARSE_ERROR(NULL);
}
#ifdef DEBUG_VARS_DECODE
printf("VARS: All Variable length %d\n", AllVarLen);
#endif
/* We know how long the variable list is. Parse it. */
while ((int)AllVarLen > 0) {
/* Create a new variable */
Var = snmp_var_new(NULL, MAX_NAME_LEN);
if (Var == NULL)
return(NULL);
/* Parse the header to find out the length of this variable. */
ThisVarLen = AllVarLen;
tmp = asn_parse_header(bufp, &ThisVarLen, &VarBindType);
if (tmp == NULL)
ASN_PARSE_ERROR(NULL);
/* Now that we know the length , figure out how it relates to
* the entire variable list
*/
AllVarLen = AllVarLen - (ThisVarLen + (tmp - bufp));
bufp = tmp;
/* Is it valid? */
if (VarBindType != (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR)) {
snmp_set_api_error(SNMPERR_PDU_PARSE);
ASN_PARSE_ERROR(NULL);
}
#ifdef DEBUG_VARS_DECODE
printf("VARS: Header type 0x%x (%d bytes left)\n", VarBindType, ThisVarLen);
#endif
/* Parse the OBJID */
bufp = asn_parse_objid(bufp, &ThisVarLen, &VarBindType,
Var->name, &(Var->name_length));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
if (VarBindType != (u_char)(ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OBJECT_ID)) {
snmp_set_api_error(SNMPERR_PDU_PARSE);
ASN_PARSE_ERROR(NULL);
}
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded OBJID (%d bytes). (%d bytes left)\n",
Var->name_length, ThisVarLen);
#endif
/* Keep a pointer to this object */
DataPtr = bufp;
DataLen = ThisVarLen;
/* find out type of object */
bufp = asn_parse_header(bufp, &ThisVarLen, &(Var->type));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
ThisVarLen = DataLen;
#ifdef DEBUG_VARS_DECODE
printf("VARS: Data type %d\n", Var->type);
#endif
/* Parse the type */
switch((short)Var->type){
case ASN_INTEGER:
Var->val.integer = (int *)malloc(sizeof(int));
if (Var->val.integer == NULL) {
snmp_set_api_error(SNMPERR_OS_ERR);
return(NULL);
}
Var->val_len = sizeof(int);
bufp = asn_parse_int(DataPtr, &ThisVarLen,
&Var->type, (int *)Var->val.integer,
Var->val_len);
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded integer '%d' (%d bytes left)\n",
*(Var->val.integer), ThisVarLen);
#endif
break;
case SMI_COUNTER32:
case SMI_GAUGE32:
/* case SMI_UNSIGNED32: */
case SMI_TIMETICKS:
Var->val.integer = (int *)malloc(sizeof(u_int));
if (Var->val.integer == NULL) {
snmp_set_api_error(SNMPERR_OS_ERR);
return(NULL);
}
Var->val_len = sizeof(u_int);
bufp = asn_parse_unsigned_int(DataPtr, &ThisVarLen,
&Var->type, (u_int *)Var->val.integer,
Var->val_len);
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded timeticks '%d' (%d bytes left)\n",
*(Var->val.integer), ThisVarLen);
#endif
break;
case ASN_OCTET_STR:
case SMI_IPADDRESS:
case SMI_OPAQUE:
Var->val_len = *&ThisVarLen; /* String is this at most */
Var->val.string = (u_char *)malloc((unsigned)Var->val_len);
if (Var->val.string == NULL) {
snmp_set_api_error(SNMPERR_OS_ERR);
return(NULL);
}
bufp = asn_parse_string(DataPtr, &ThisVarLen,
&Var->type, Var->val.string,
&Var->val_len);
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded string '%s' (length %d) (%d bytes left)\n",
(Var->val.string), Var->val_len, ThisVarLen);
#endif
break;
case ASN_OBJECT_ID:
Var->val_len = MAX_NAME_LEN;
bufp = asn_parse_objid(DataPtr, &ThisVarLen,
&Var->type, TmpBuf, &Var->val_len);
Var->val_len *= sizeof(oid);
Var->val.objid = (oid *)malloc((unsigned)Var->val_len);
if (Var->val.integer == NULL) {
snmp_set_api_error(SNMPERR_OS_ERR);
return(NULL);
}
/* Only copy if we successfully decoded something */
if (bufp) {
memcpy((char *)Var->val.objid, (char *)TmpBuf, Var->val_len);
}
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded OBJID (length %d) (%d bytes left)\n",
Var->val_len, ThisVarLen);
#endif
break;
case ASN_NULL:
case SMI_NOSUCHINSTANCE:
case SMI_NOSUCHOBJECT:
case SMI_ENDOFMIBVIEW:
Var->val_len = 0;
Var->val.objid = NULL;
bufp = asn_parse_null(DataPtr, &ThisVarLen, &Var->type);
#ifdef DEBUG_VARS_DECODE
printf("VARS: Decoded ASN_NULL (length %d) (%d bytes left)\n",
Var->val_len, ThisVarLen);
#endif
break;
case SMI_COUNTER64:
#ifdef STDERR_OUTPUT
fprintf(stderr, WIDE("Unable to parse type SMI_COUNTER64!\n"));
#endif
snmp_set_api_error(SNMPERR_UNSUPPORTED_TYPE);
return(NULL);
break;
default:
#ifdef STDERR_OUTPUT
fprintf(stderr, WIDE("bad type returned (%x)\n"), Var->type);
#endif
snmp_set_api_error(SNMPERR_PDU_PARSE);
return(NULL);
break;
} /* End of var type switch */
/* Why is this here? XXXXX */
if (bufp == NULL)
return(NULL);
#ifdef DEBUG_VARS_DECODE
printf("VARS: Adding to list of decoded variables. (%d bytes remain.)\n", AllVarLen);
#endif
/* Add variable to the list */
*VarLastP = Var;
VarLastP = &(Var->next_variable);
}
return(bufp);
}
//*
//* Parse_var_op_list goes through the list of variables and retrieves each one,
//* placing it's value in the output packet. In the case of a set request,
//* if action is RESERVE, the value is just checked for correct type and
//* value, and resources may need to be reserved. If the action is COMMIT,
//* the variable is set. If the action is FREE, an error was discovered
//* somewhere in the previous RESERVE pass, so any reserved resources
//* should be FREE'd.
//* If any error occurs, an error code is returned.
//*
int
parse_var_op_list(
snmp_session *session,
uint8 *data, //point to variable-binding of in-packet data
int length, //in packet data length
uint8 *out_data, //point to variable-binding of out-packet data
int out_length, //out packet buffer length
long *index, //error-index (output)
int msgtype, //message type
int action //???
)
{
uint8 type;
oid var_name[SNMP_MAX_NAME_LEN];
int var_name_len, var_val_len;
uint8 var_val_type, *var_val, statType;
uint8 *statP;
int statLen;
uint16 acl;
int (*write_method)();
uint8 *headerP, *var_list_start;
int dummyLen;
#ifdef WEBADMIN
int dummyLen1; // add -- By arius 5/17/2000
uint8 *newpacket_end; // add -- By arius 5/17/2000
#endif WEBADMIN
int noSuchObject;
int (*WriteMethod)(int,uint8 *,uint8,int,uint8 *,oid *,int);
int err, exact;
// if (msgtype== SET_REQ_MSG) rw = SNMP_WRITE;
// else rw = SNMP_READ;
if (msgtype == GETNEXT_REQ_MSG) exact = FALSE;
else exact = TRUE;
//Parse variable-binging header
data = asn_parse_header(data, &length, &type);
if (data == NULL){
ERROR("not enough space for varlist");
return PARSE_ERROR;
}
if (type != (uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR)){
ERROR("wrong type");
return PARSE_ERROR;
}
headerP = out_data;
//Set Resp variable-binging header
out_data = asn_build_sequence(out_data, &out_length,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR), 0);
if (out_data == NULL){
ERROR("not enough space in output packet");
return BUILD_ERROR;
}
var_list_start = out_data;
*index = 1;
while((int)length > 0){
// parse the name, value pair
var_name_len = SNMP_MAX_NAME_LEN;
data = snmp_parse_var_op(data, var_name, &var_name_len, &var_val_type,
&var_val_len, &var_val, (int *)&length);
if (data == NULL) return PARSE_ERROR;
// now attempt to retrieve the variable on the local entity
statP = getStatPtr(var_name, &var_name_len, &statType,
&statLen, &acl, exact,
&write_method, SNMP_VERSION_1, &noSuchObject,
(msgtype==SET_REQ_MSG?
(session->access & SNMP_ACCESS_WRITE):
(session->access & SNMP_ACCESS_READ) )
);
if (/* session->version == SNMP_VERSION_1 &&*/
statP == NULL &&
(msgtype != SET_REQ_MSG || !write_method))
{
//** XXX: happens when running
// XXX: snmpwalk localhost public .1
// XXX: fix me some day.
//**
//** ERROR("warning: internal v1_error"); **
return SNMP_ERR_NOSUCHNAME;
}
// check if this variable is read-write (in the MIB sense).
if( msgtype == SET_REQ_MSG && acl != RWRITE )
return SNMP_ERR_READONLY;
// return session->version == SNMP_VERSION_1 ? SNMP_ERR_NOSUCHNAME : SNMP_ERR_NOTWRITABLE;
//* Its bogus to check here on getnexts - the whole packet shouldn't
// be dumped - this should should be the loop in getStatPtr
// luckily no objects are set unreadable. This can still be
// useful for sets to determine which are intrinsically writable
if (msgtype== SET_REQ_MSG){
if (write_method == NULL){
if (statP != NULL){
// see if the type and value is consistent with this entity's variable
if (!goodValue(var_val_type, var_val_len, statType,statLen))
{
// if (session->version != SNMP_VERSION_1)
// return SNMP_ERR_WRONGTYPE; // poor approximation
// else
{
snmp_inbadvalues++;
return SNMP_ERR_BADVALUE;
}
}
// actually do the set if necessary
if (action == COMMIT)
setVariable(var_val, var_val_type, var_val_len,statP, statLen);
} else {
// if (session->version != SNMP_VERSION_1)
// return SNMP_ERR_NOCREATION;
// else
return SNMP_ERR_NOSUCHNAME;
}
} else {
WriteMethod = (int (*)(int,uint8 *,uint8,int,uint8 *,oid *,int)) write_method;
err = (*WriteMethod)(action, var_val, var_val_type,
var_val_len, statP, var_name,
var_name_len);
//*
//* Map the SNMPv2 error codes to SNMPv1 error codes (RFC 2089).
//*
// if (session->version == SNMP_VERSION_1) {
switch (err) {
case SNMP_ERR_NOERROR:
// keep the no-error error:
break;
case SNMP_ERR_WRONGVALUE:
case SNMP_ERR_WRONGENCODING:
case SNMP_ERR_WRONGTYPE:
case SNMP_ERR_WRONGLENGTH:
case SNMP_ERR_INCONSISTENTVALUE:
err = SNMP_ERR_BADVALUE;
break;
case SNMP_ERR_NOACCESS:
case SNMP_ERR_NOTWRITABLE:
case SNMP_ERR_NOCREATION:
case SNMP_ERR_INCONSISTENTNAME:
case SNMP_ERR_AUTHORIZATIONERROR:
err = SNMP_ERR_NOSUCHNAME;
break;
default:
err = SNMP_ERR_GENERR;
break;
// }
}//if(session->version == SNMP_VERSION_1) ....
if (err != SNMP_ERR_NOERROR){
// if (session->version == SNMP_VERSION_1) {
snmp_inbadvalues++;
// }
return err;
}
}
} else {
//* retrieve the value of the variable and place it into the
//* outgoing packet
if (statP == NULL){
statLen = 0;
if (exact){
if (noSuchObject == TRUE){
statType = SNMP_NOSUCHOBJECT;
} else {
statType = SNMP_NOSUCHINSTANCE;
}
} else {
statType = SNMP_ENDOFMIBVIEW;
}
} //if (statP == NULL) ...
out_data = snmp_build_var_op(out_data, var_name, &var_name_len,
statType, statLen, statP,
&out_length);
if (out_data == NULL){
return SNMP_ERR_TOOBIG;
}
} //if (msgtype== SET_REQ_MSG) ...
(*index)++;
} //while((int)length > 0) ....
if(msgtype!= SET_REQ_MSG){
// save a pointer to the end of the packet
packet_end = out_data;
// Now rebuild header with the actual lengths
dummyLen = packet_end - var_list_start;
// modified by ---- Arius 5/17/2000
#ifdef WEBADMIN
dummyLen1 = packet_end - headerP;
newpacket_end = asn_build_sequence(headerP, &dummyLen1,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR), dummyLen);
var_list_start -= (packet_end - newpacket_end);
out_length += (packet_end - newpacket_end);
// save new pointer to the end of the packet when the sapces will be adjust
packet_end = newpacket_end;
if (headerP == NULL)
#else
if (asn_build_sequence(headerP, &dummyLen,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR),
dummyLen) == NULL)
#endif WEBADMIN
// end of here
{
return SNMP_ERR_TOOBIG; // bogus error ????
}
}
*index = 0;
return SNMP_ERR_NOERROR;
}
int
snmp_agent_parse(
snmp_session *session,
uint8 *indata,
int inlength,
uint8 *outdata,
int *outlength
)
{
uint8 msgtype, type;
long zero = 0;
long reqid, errstat, errindex, dummyindex;
uint8 *out_auth, *out_header, *out_reqid;
uint8 *startData = indata;
int startLength = inlength;
long version;
uint8 *origdata = indata;
int origlen = inlength;
// usecEntry *ue;
int packet_len, ret = 0;
#ifdef WEBADMIN
int newoutdata; // add -- by arius 5/17/2000
int len; // add -- by arius 5/17/2000
#endif WEBADMIN
session->community_len = COMMUNITY_MAX_LEN;
//get community name
indata = snmp_parse_auth(indata, &inlength, community, &session->community_len, &version);
if (indata == NULL){
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("bad auth encoding");
return 0;
}
#if 1 //ONLY SUPPORT VERSION 1
if(version != SNMP_VERSION_1) {
ERROR("wrong version");
snmp_inbadversions++;
return 0;
}
#else ////////////////////////////////////////////
if( version != SNMP_VERSION_1 && version != SNMP_VERSION_2C && version != SNMP_VERSION_2 ) {
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("wrong version");
snmp_inbadversions++;
return 0;
}
if( version == SNMP_VERSION_2C || version == SNMP_VERSION_2 ) {
if( version == SNMP_VERSION_2 ) {
ret = check_auth( session, origdata, origlen, indata - session->community_len, session->community_len, &ue );
*outlength = (SNMP_MAX_LEN < session->MMS) ? SNMP_MAX_LEN : session->MMS;
session->MMS = SNMP_MAX_LEN;
} else if( version == SNMP_VERSION_2C ) {
ret = community_auth( session );
session->version = SNMP_VERSION_2C;
}
if( ret < 0 ) {
// increment_stat( -ret );
if( (indata=asn_parse_header(indata, &inlength, &msgtype))
&& asn_parse_int(indata, &inlength, &type, &reqid, sizeof(reqid)) )
{
if( msgtype == REPORT_MSG ) return 0;
if( !(session->qoS & USEC_QOS_GENREPORT) ) return 0;
session->agentBoots = _agentBoots;
session->agentClock = _agentStartTime;
memcpy( session->agentID, _agentID, 12 );
session->MMS = SNMP_MAX_LEN;
create_report( session, outdata, outlength, -ret, reqid );
return 1;
} else {
return 0;
}
} else if( ret > 0 ) {
// increment_stat( ret );
return 0;
}
} else {
#endif /////////////////////////////////////////////////////
//VERSION 1
if(community_auth( session )==0) return 0;
// session->version = SNMP_VERSION_1;
#if 0 ////////
}
#endif ///////
indata = asn_parse_header(indata, &inlength, &msgtype);
if (indata == NULL){
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("bad header");
return 0;
}
// XXX: increment by total number of vars at correct place:
snmp_intotalreqvars++;
if(msgtype == GET_REQ_MSG) snmp_ingetrequests++;
else if (msgtype == GETNEXT_REQ_MSG) snmp_ingetnexts++;
else if (msgtype == SET_REQ_MSG) snmp_insetrequests++;
else return 0;
// if (msgtype == GETBULK_REQ_MSG: //version 2
// Request ID
indata = asn_parse_int(indata, &inlength, &type, &reqid, sizeof(reqid));
if (indata == NULL){
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("bad parse of reqid");
return 0;
}
//Error Status
indata = asn_parse_int(indata, &inlength, &type, &errstat, sizeof(errstat));
if (indata == NULL){
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("bad parse of errstat");
snmp_inasnparseerrors++;
return 0;
}
//Error Index
indata = asn_parse_int(indata, &inlength, &type, &errindex, sizeof(errindex));
if (indata == NULL){
// increment_stat( SNMP_STAT_ENCODING_ERRORS );
ERROR("bad parse of errindex");
return 0;
}
//
// Now start cobbling together what is known about the output packet.
// The final lengths are not known now, so they will have to be recomputed
// later.
//
// setup for response
//Simon time( (time_t *) &session->agentTime );
//Simon session->agentClock = _agentStartTime;
//Simon session->agentBoots = _agentBoots;
//Simon memcpy( session->agentID, _agentID, 12 );
out_auth = outdata;
//Set Resp Community
out_header = snmp_build_auth(out_auth, outlength,
community,session->community_len,
(long)SNMP_VERSION_1,0);
if (out_header == NULL){
ERROR("snmp_build_auth failed");
snmp_inasnparseerrors++;
return 0;
}
out_reqid = asn_build_sequence(out_header, outlength, (uint8)GET_RSP_MSG, 0);
if (out_reqid == NULL){
ERROR("out_reqid == NULL");
return 0;
}
//Set Resp ID
type = (uint8)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_INTEGER);
// return identical request id
outdata = asn_build_int(out_reqid, outlength, type, &reqid, sizeof(reqid));
if (outdata == NULL){
ERROR("build reqid failed");
return 0;
}
// assume that error status will be zero
outdata = asn_build_int(outdata, outlength, type, &zero, sizeof(zero));
if (outdata == NULL){
ERROR("build errstat failed");
return 0;
}
// assume that error index will be zero
outdata = asn_build_int(outdata, outlength, type, &zero, sizeof(zero));
if (outdata == NULL){
ERROR("build errindex failed");
return 0;
}
#if 0 ///////////////////////////////////////////
if (msgtype == GETBULK_REQ_MSG)
errstat = bulk_var_op_list(indata, inlength, outdata, *outlength,
errstat, errindex, &errindex );
else
#endif 0 ////////////////////////////////////////
errstat = parse_var_op_list(session, indata, inlength, outdata, *outlength,
&errindex, msgtype, RESERVE1);
if (msgtype== SET_REQ_MSG){
if (errstat == SNMP_ERR_NOERROR)
errstat = parse_var_op_list(session, indata, inlength, outdata, *outlength,
&errindex, msgtype, RESERVE2);
if (errstat == SNMP_ERR_NOERROR){
//
//* SETS require 3-4 passes through the var_op_list. The first two
//* passes verify that all types, lengths, and values are valid
//* and may reserve resources and the third does the set and a
//* fourth executes any actions. Then the identical GET RESPONSE
//* packet is returned.
//* If either of the first two passes returns an error, another
//* pass is made so that any reserved resources can be freed.
//*
parse_var_op_list(session, indata, inlength, outdata, *outlength,
&dummyindex, msgtype, COMMIT);
parse_var_op_list(session, indata, inlength, outdata, *outlength,
&dummyindex, msgtype, ACTION);
if (create_identical(session, startData, out_auth, startLength, 0L, 0L )){
*outlength = packet_end - out_auth;
return 1;
}
return 0;
} else {
parse_var_op_list(session, indata, inlength, outdata, *outlength,
&dummyindex, msgtype, COMM_FREE);
}
}
switch((short)errstat){
case SNMP_ERR_NOERROR:
// re-encode the headers with the real lengths
*outlength = packet_end - out_header;
packet_len = *outlength;
outdata = asn_build_sequence(out_header, outlength, GET_RSP_MSG,
packet_end - out_reqid);
// add --- By arius 5/17/2000
#ifdef WEBADMIN
newoutdata = packet_end - outdata; // how many shifts
len = packet_end - out_reqid;
packet_end = outdata; // save new pointer end of packet
outdata -= len;
out_reqid = out_reqid - newoutdata;
#endif WEBADMIN
// end of here
if (outdata != out_reqid){
ERROR("internal error: header");
return 0;
}
*outlength = packet_end - out_auth;
outdata = snmp_build_auth(out_auth, outlength,
community, session->community_len,
(long)SNMP_VERSION_1,
packet_end - out_header );
// add --- By arius 5/17/2000
#ifdef WEBADMIN
out_header -= (packet_end - outdata);
packet_end = outdata; // save new pointer end of packet
#endif WEBADMIN
// end of here
*outlength = packet_end - out_auth;
#if 0
// packet_end is correct for old SNMP. This dichotomy needs to be fixed.
if (session->version == SNMP_VERSION_2)
packet_end = out_auth + packet_len;
#endif
break;
case SNMP_ERR_TOOBIG:
snmp_intoobigs++;
#if notdone
if (session->version == SNMP_VERSION_2){
create_toobig(out_auth, *outlength, reqid, pi);
break;
} // else FALLTHRU
#endif
case SNMP_ERR_NOACCESS:
case SNMP_ERR_WRONGTYPE:
case SNMP_ERR_WRONGLENGTH:
case SNMP_ERR_WRONGENCODING:
case SNMP_ERR_WRONGVALUE:
case SNMP_ERR_NOCREATION:
case SNMP_ERR_INCONSISTENTVALUE:
case SNMP_ERR_RESOURCEUNAVAILABLE:
case SNMP_ERR_COMMITFAILED:
case SNMP_ERR_UNDOFAILED:
case SNMP_ERR_AUTHORIZATIONERROR:
case SNMP_ERR_NOTWRITABLE:
case SNMP_ERR_INCONSISTENTNAME:
case SNMP_ERR_NOSUCHNAME:
case SNMP_ERR_BADVALUE:
case SNMP_ERR_READONLY:
case SNMP_ERR_GENERR:
if (create_identical(session, startData, out_auth, startLength, errstat,
errindex)){
*outlength = packet_end - out_auth;
return 1;
}
return 0;
default:
return 0;
}
#if 0
if( session->qoS & USEC_QOS_AUTH ) {
md5Digest( out_auth, *outlength, outdata - (session->contextLen + 16),
outdata - (session->contextLen + 16) );
}
#endif
return 1;
}
char *
snmp_parse_trap(u_char * trapdata, /* IN - actual trap data from packet */
unsigned datalen, /* IN - length of trapdata */
struct trap_info * trapInfo) /* IN/OUT - struct to fill in */
{
u_char * more; /* pointer to next unparsed PDU data */
u_char * nextVar; /* pointer to next unparsed TRAP variable */
unsigned left; /* length of more */
long version; /* SNMP version, always v1 */
u_char type; /* data types for checking */
u_char * varValPtr;
int vars_in_struct;
struct trapVar * vars; /* trap variables data structures */
u_long trapType;
unsigned length; /* scratch for passing to asn1 */
/* do some basic setup of the passed data structures */
vars_in_struct = trapInfo->trapVars;
trapInfo->trapVars = 0; /* bump later if vars are present */
left = datalen;
more = snmp_auth_parse(trapdata, &left, (u_char*)trapInfo->community,
(unsigned*)&trapInfo->commLen, &version);
if (!more)
return "community parse";
more = asn_parse_header(more, &left, &type);
if (!more || type != TRP_REQ_MSG)
return "trap pdu header";
more = asn_parse_objid(more, &left, &type, &trapInfo->objId[0],
(unsigned*)&trapInfo->objLen);
if (!more || type != ASN_OBJECT_ID)
return "sys ObjId";
length = 4; /* number of bytes in IP address buffer */
more = asn_parse_string(more, &left, &type,
(u_char*)(&trapInfo->agent_ip), &length);
if (!more || type != IPADDRESS)
return "agent's IP address";
more = asn_parse_int(more, &left, &type, (long*)&trapType, sizeof(long));
if (!more || type != ASN_INTEGER || trapType > 6)
return "trap type";
trapInfo->trapType = trapType;
more = asn_parse_int(more, &left, &type, (long*)&trapType, sizeof(long));
if (!more || type != ASN_INTEGER)
return "specific type";
trapInfo->trapSpecific = trapType;
more = asn_parse_int(more, &left, &type, (long*)&trapInfo->time, sizeof(long));
if (!more || type != TIMETICKS)
return "timestamp";
if (!left) /* no variables in trap ? */
return NULL;
/* rest of packet is a sequence of variables */
more = asn_parse_header(more, &left, &type); /* strip off leading SEQ */
if (!more || type != SEQUENCE)
return "trap vars header";
vars = trapInfo->vars; /* set pointer array to receive variables data */
while (left) /* keep parsing & counting vars as long as there's data */
{
/* extract variable info for this var */
length = left; /* number of valid bytes left in packet buffer */
varNameLen = MAX_OID_LEN ; /* define the max size of varName */
nextVar = snmp_parse_var_op(more, varName, &varNameLen, &varType,
&varLen, &varValPtr, &left);
if (!nextVar) /* quit if parse failed */
return ("var_op header");
/* extract the variable's value; pointed to by varValPtr: */
length -= more - nextVar; /* deduct size of header -> max. length of var */
switch (varType)
{
case ASN_INTEGER:
case GAUGE:
case COUNTER:
case TIMETICKS:
varLen = sizeof(long); /* size required by asn_parse_int() */
nextVar = asn_parse_int(varValPtr, &length, &varType,
(long *)(&varVal[0]), varLen);
break;
case ASN_OCTET_STR:
case IPADDRESS:
case OPAQUE:
varLen = MAX_TRAP_VAR;
nextVar = asn_parse_string(varValPtr, &length, &varType,
varVal, &varLen);
break;
case ASN_OBJECT_ID:
varLen = MAX_TRAP_VAR;
nextVar = asn_parse_objid(varValPtr, &length, &varType,
(oid *)(&varVal[0]), &varLen);
break;
case ASN_NULL:
nextVar = asn_parse_null(varValPtr, &length, &varType);
break;
default:
SNMPERROR("wrong type");
return NULL;
}
if (!nextVar)
return("variable");
/* if another trap variable info slot is available, fill it in */
if (trapInfo->trapVars <= vars_in_struct)
{
oidcpy(vars->varName, varName, varNameLen);
if (vars->varBufLen <= varLen) /* need to truncate? */
vars->varValLen = vars->varBufLen-1;
else /* we have room for the full variable data field */
vars->varValLen = varLen;
MEMCPY(vars->varBuf, varVal, vars->varValLen);
vars->varNameLen = varNameLen;
vars->varType = varType;
vars++; /* point to next variable info structure */
}
trapInfo->trapVars++; /* another var */
more = nextVar; /* bump pointer to pdu */
}
return NULL;
}
//*
//*---------------------------------------------------------------------------------
//* Function Name: snmp_parse_var
//* Description : Get variables by parsing snmp message. The message is decoded in
//* BER deconding rules.
//* Return Value : Pointer of decoding variables
//* Calling To : asn_parse_header, asn_parse_objid, asn_parse_int,
//* asn_parse_string
//* Called By : snmp_parse
//*---------------------------------------------------------------------------------
//*
variable_list *snmp_parse_var(uint8 *data,int length)
{
uint8 type;
variable_list vh, *vp;
uint8 *varBindP;
int varBind_len;
uint8 objId[SNMP_MAX_NAME_LEN];
uint8 *varVal;
int parse_ok;
data = asn_parse_header(data, &length, &type);
if ((data == NULL) || (type != (uint8) (ASN_SEQUENCE | ASN_CONSTRUCTOR)))
return ( NULL );
vh.next = NULL;
vp = &vh;
varBindP = data;
parse_ok = TRUE;
while (length > 0) {
varBind_len = length;
vp->next = (variable_list *) malloc(sizeof(variable_list));
if (vp->next == NULL) {
parse_ok = FALSE;
break; //---SNMP: Memory allocation error on 'snmp_parse_var'.
}
else {
vp = vp->next;
vp->next = NULL;
vp->name = NULL;
vp->name_len = SNMP_MAX_NAME_LEN;
vp->val.string = NULL;
}
varBindP = asn_parse_header(varBindP, &varBind_len, &type);
if ((varBindP == NULL) ||
(type != (uint8) (ASN_SEQUENCE | ASN_CONSTRUCTOR))) {
parse_ok = FALSE;
break;
}
//*
//* Parse variable bind name.
//*
varBindP = asn_parse_objid(varBindP, &varBind_len, &type, objId, &vp->name_len);
if ((varBindP == NULL) ||
(type != (uint8) (ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID))) {
parse_ok = FALSE;
break;
}
vp->name = (oid *) malloc((unsigned) vp->name_len * sizeof(oid));
if (vp->name == NULL) {
parse_ok = FALSE;
break; //-----SNMP: Memory alloc error on 'snmp_parse_var'.
}
else {
bcopy((char *) objId, (char *) vp->name, vp->name_len * sizeof(oid));
}
//*
//* Parse variable bind value.
//*
varVal = varBindP;
varBindP = asn_parse_header(varBindP, &varBind_len, &vp->type);
if (varBindP == NULL) {
parse_ok = FALSE;
break;
}
else {
vp->val_len = varBind_len;
varBindP = varBindP + varBind_len; // skip value body to next variable
length = length - (int)(varBindP - data);
data = varBindP;
varBind_len = SNMP_MAX_LEN;
}
switch (vp->type) {
case ASN_INTEGER:
case COUNTER:
case GAUGE:
case TIMETICKS:
vp->val_len = sizeof(long); // support long intger only
vp->val.integer = (long *) malloc(vp->val_len);
if (vp->val.integer == NULL) {
parse_ok = FALSE;
break; //---SNMP:Memory alloc error on 'snmp_parse_var'.
}
asn_parse_int(varVal, &varBind_len, &vp->type,
(long *) vp->val.integer, vp->val_len);
break;
case ASN_OCTET_STRING:
case IPADDRESS:
case OPAQUE:
vp->val.string = (uint8 *) malloc(vp->val_len);
if (vp->val.string == NULL) {
parse_ok = FALSE;
break; //----SNMP:Memory alloc error on 'snmp_parse_var'.
}
asn_parse_string(varVal, &varBind_len, &vp->type,
vp->val.string, &vp->val_len);
break;
case ASN_OBJECT_ID:
vp->val_len = SNMP_MAX_NAME_LEN;
asn_parse_objid(varVal, &varBind_len, &vp->type, objId, &vp->val_len);
vp->val_len = vp->val_len * sizeof(oid);
vp->val.objid = (oid *) malloc((unsigned) vp->val_len);
if (vp->val.objid == NULL) {
parse_ok = FALSE;
break; //---SNMP:Memory alloc error on 'snmp_parse_var'.
}
bcopy((char *) objId, (char *) vp->val.objid, vp->val_len);
break;
case ASN_NULL:
break;
default:
parse_ok = FALSE; //-----Warning: Bad type received.
break;
}
if ( ! parse_ok ) break;
}
if ( parse_ok ) {
return( vh.next );
}
else {
while ( vh.next ) {
vp = vh.next;
vh.next = vp->next;
if (vp->name != NULL) free((char *) vp->name);
if (vp->val.string != NULL) free((char *) vp->val.string);
free((char *) vp);
}
return ( NULL );
}
}
/* Decodes PDU from Packet into PDU.
*
* Returns a pointer to the next byte of the packet, which is where the
* Variable Bindings start.
*/
u_char *snmp_pdu_decode(u_char *Packet, /* data */
int *Length, /* &length */
struct snmp_pdu *PDU) /* pdu */
{
u_char *bufp;
u_char PDUType;
int four;
u_char ASNType;
oid objid[MAX_NAME_LEN];
bufp = asn_parse_header(Packet, Length, &PDUType);
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
#ifdef DEBUG_PDU_DECODE
printf("PDU Type: %d\n", PDUType);
#endif
PDU->command = PDUType;
switch (PDUType) {
case TRP_REQ_MSG:
/* SNMPv1 Trap Message */
/* enterprise */
PDU->enterprise_length = MAX_NAME_LEN;
bufp = asn_parse_objid(bufp, Length,
&ASNType, objid, &PDU->enterprise_length);
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
PDU->enterprise = (oid *)malloc(PDU->enterprise_length * sizeof(oid));
if (PDU->enterprise == NULL) {
snmp_set_api_error(SNMPERR_OS_ERR);
return(NULL);
}
memcpy((char *)PDU->enterprise, (char *)objid,
PDU->enterprise_length * sizeof(oid));
/* Agent-addr */
four = 4;
bufp = asn_parse_string(bufp, Length,
&ASNType,
(u_char *)&PDU->agent_addr.sin_addr.s_addr,
&four);
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
/* Generic trap */
bufp = asn_parse_int(bufp, Length,
&ASNType,
(int *)&PDU->trap_type,
sizeof(PDU->trap_type));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
/* Specific Trap */
bufp = asn_parse_int(bufp, Length,
&ASNType,
(int *)&PDU->specific_type,
sizeof(PDU->specific_type));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
/* Timestamp */
bufp = asn_parse_unsigned_int(bufp, Length,
&ASNType,
&PDU->time, sizeof(PDU->time));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
break;
/**********************************************************************/
case SNMP_PDU_GETBULK:
/* SNMPv2 Bulk Request */
/* request id */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->reqid, sizeof(PDU->reqid));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
/* non-repeaters */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->non_repeaters, sizeof(PDU->non_repeaters));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
/* max-repetitions */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->max_repetitions, sizeof(PDU->max_repetitions));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
break;
/**********************************************************************/
default:
/* Normal PDU Encoding */
/* request id */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->reqid, sizeof(PDU->reqid));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
#ifdef DEBUG_PDU_DECODE
printf("PDU Request ID: %d\n", PDU->reqid);
#endif
/* error status */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->errstat, sizeof(PDU->errstat));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
#ifdef DEBUG_PDU_DECODE
printf("PDU Error Status: %d\n", PDU->errstat);
#endif
/* error index */
bufp = asn_parse_int(bufp, Length,
&ASNType,
&PDU->errindex, sizeof(PDU->errindex));
if (bufp == NULL)
ASN_PARSE_ERROR(NULL);
#ifdef DEBUG_PDU_DECODE
printf("PDU Error Index: %d\n", PDU->errindex);
#endif
break;
}
return(bufp);
}
