//*
//*---------------------------------------------------------------------------------
//* 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);
}
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;
}
int
writeSystem(int action,
u_char *var_val,
u_char var_val_type,
int var_val_len,
u_char *statP,
oid *name,
int name_len)
{
int bigsize = 1000;
u_char buf[sizeof(version_descr)], *cp;
int count, size;
if (var_val_type != ASN_OCTET_STR){
printf("not string\n");
return SNMP_ERR_WRONGTYPE;
}
if (var_val_len > sizeof(version_descr)-1){
printf("bad length\n");
return SNMP_ERR_WRONGLENGTH;
}
size = sizeof(buf);
asn_parse_string(var_val, &bigsize, &var_val_type, buf, &size);
for(cp = buf, count = 0; count < size; count++, cp++){
if (!isprint(*cp)){
printf("not print %x\n", *cp);
return SNMP_ERR_WRONGVALUE;
}
}
buf[size] = 0;
if (action == COMMIT){
switch((char)name[7]){
case 1:
strcpy(version_descr, (char *) buf);
break;
case 4:
strcpy(sysContact, (char *) buf);
break;
case 5:
strcpy(sysName, (char *) buf);
break;
case 6:
strcpy(sysLocation, (char *) buf);
break;
}
}
return SNMP_ERR_NOERROR;
} /* end of writeSystem */
/*******************************************************************-o-******
* snmp_comstr_parse
*
* Parameters:
* *data (I) Message.
* *length (I/O) Bytes left in message.
* *psid (O) Community string.
* *slen (O) Length of community string.
* *version (O) Message version.
*
* Returns:
* Pointer to the remainder of data.
*
*
* Parse the header of a community string-based message such as that found
* in SNMPv1 and SNMPv2c.
*/
u_char *
snmp_comstr_parse(u_char * data,
size_t * length,
u_char * psid, size_t * slen, long *version)
{
u_char type;
long ver;
size_t origlen = *slen;
/*
* Message is an ASN.1 SEQUENCE.
*/
data = asn_parse_sequence(data, length, &type,
(ASN_SEQUENCE | ASN_CONSTRUCTOR),
"auth message");
if (data == NULL) {
return NULL;
}
/*
* First field is the version.
*/
DEBUGDUMPHEADER("recv", "SNMP version");
data = asn_parse_int(data, length, &type, &ver, sizeof(ver));
DEBUGINDENTLESS();
*version = ver;
if (data == NULL) {
ERROR_MSG("bad parse of version");
return NULL;
}
/*
* second field is the community string for SNMPv1 & SNMPv2c
*/
DEBUGDUMPHEADER("recv", "community string");
data = asn_parse_string(data, length, &type, psid, slen);
DEBUGINDENTLESS();
if (data == NULL) {
ERROR_MSG("bad parse of community");
return NULL;
}
psid[SNMP_MIN(*slen, origlen - 1)] = '\0';
return (u_char *) data;
} /* end snmp_comstr_parse() */
void setVariable(uint8 *var_val,uint8 var_val_type,int var_val_len,uint8 *statP,int statLen)
{
int buffersize = 1000;
switch(var_val_type){
case ASN_INTEGER:
case COUNTER:
case GAUGE:
case TIMETICKS:
asn_parse_int(var_val, &buffersize, &var_val_type, (long *)statP, statLen);
break;
case ASN_OCTET_STRING:
case IPADDRESS:
case OPAQUE:
asn_parse_string(var_val, &buffersize, &var_val_type, statP, &statLen);
break;
case ASN_OBJECT_ID:
asn_parse_objid(var_val, &buffersize, &var_val_type, (oid *)statP, &statLen);
break;
}
}
static void
setVariable(u_char *var_val,
u_char var_val_type,
size_t var_val_len,
u_char *statP,
size_t statLen)
{
size_t buffersize = 1000;
switch(var_val_type){
case ASN_INTEGER:
asn_parse_int(var_val, &buffersize, &var_val_type, (long *)statP, statLen);
break;
case ASN_COUNTER:
case ASN_GAUGE:
case ASN_TIMETICKS:
asn_parse_unsigned_int(var_val, &buffersize, &var_val_type, (u_long *)statP, statLen);
break;
case ASN_COUNTER64:
asn_parse_unsigned_int64(var_val, &buffersize, &var_val_type,
(struct counter64 *)statP, statLen);
break;
case ASN_OCTET_STR:
case ASN_IPADDRESS:
case ASN_OPAQUE:
case ASN_NSAP:
asn_parse_string(var_val, &buffersize, &var_val_type, statP, &statLen);
break;
case ASN_OBJECT_ID:
asn_parse_objid(var_val, &buffersize, &var_val_type, (oid *)statP, &statLen);
break;
case ASN_BIT_STR:
asn_parse_bitstring(var_val, &buffersize, &var_val_type, statP, &statLen);
break;
}
}
int
decode_vbind (unsigned char *data, unsigned int vb_len)
{
unsigned char *var_val;
oid var_name[MAX_OID_LEN]; /* To test the objid */
size_t name_len = MAX_OID_LEN; /* To test the objid */
int badtype=0;
size_t len;
struct variable_list *vp;
oid objid[MAX_OID_LEN];
char _docsis_snmp_label[50]; /* To hold the 'name' of the type, i.e. Integer etc */
char *enum_string = NULL;
static char outbuf[16384];
struct tree *subtree;
struct enum_list *enums;
memset (outbuf, 0, 16384);
vp = (struct variable_list *) malloc (sizeof (struct variable_list));
if (vp == NULL)
{
fprintf (stderr, "Out of memory\n");
return 0;
}
memset (vp, 0, sizeof (struct variable_list));
vp->next_variable = NULL;
vp->val.string = NULL;
vp->name_length = MAX_OID_LEN;
vp->name = 0;
data = snmp_parse_var_op (data, objid, &vp->name_length, &vp->type, &vp->val_len,
&var_val, (size_t *) & vb_len);
if (data == NULL)
return -1;
if (snmp_set_var_objid (vp, objid, vp->name_length))
return -1;
len = PACKET_LENGTH;
if (netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_EXTENDED_INDEX))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_EXTENDED_INDEX);
} /* Disable extended index format ... makes it harder to parse tokens in lex */
if (!netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_NUMERIC_ENUM))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_PRINT_NUMERIC_ENUM);
} /* Enable printing numeric enums */
if (netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_ESCAPE_QUOTES))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_ESCAPE_QUOTES);
} /* Disable escape quotes in string index output */
netsnmp_ds_set_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_SUFFIX);
if (netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_OID_OUTPUT_NUMERIC)) {
netsnmp_ds_set_int(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_NUMERIC);
}
snprint_objid (outbuf, 1023, vp->name, vp->name_length);
if (!get_node (outbuf, var_name, &name_len))
{
if (!read_objid (outbuf, var_name, &name_len))
{
fprintf (stderr,
"/* Hmm ... can't find oid %s at line %d ... perhaps the MIBs are not installed ? */\n",
outbuf, line);
/* temporarily set full output format */
netsnmp_ds_set_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_FULL);
memset (outbuf, 0, 1024);
snprint_objid (outbuf, 1023, vp->name, vp->name_length);
/* Go back to suffix-mode for better readability */
netsnmp_ds_set_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_SUFFIX);
}
}
printf("%s", outbuf);
/* save the subtree - we need it later to show enums */
subtree = get_tree (var_name, name_len, get_tree_head() );
/* This first switch is just for saving the type in the format we actually want
to print. */
switch ((short) vp->type)
{
case ASN_INTEGER:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Integer");
break;
case ASN_COUNTER:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Counter32");
break;
case ASN_GAUGE:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Gauge32");
break;
case ASN_TIMETICKS:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "TimeTicks");
break;
case ASN_UINTEGER:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Unsigned32");
break;
#ifdef OPAQUE_SPECIAL_TYPES
case ASN_OPAQUE_COUNTER64:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "OpaqueCounter64");
break;
case ASN_OPAQUE_U64:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "OpaqueU64");
break;
#endif /* OPAQUE_SPECIAL_TYPES */
case ASN_COUNTER64:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Counter64");
break;
#ifdef OPAQUE_SPECIAL_TYPES
case ASN_OPAQUE_FLOAT:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "OpaqueFloat");
break;
case ASN_OPAQUE_DOUBLE:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "OpaqueDouble");
break;
case ASN_OPAQUE_I64:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "OpaqueI64");
break;
#endif /* OPAQUE_SPECIAL_TYPES */
case ASN_OCTET_STR:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "String");
break;
case ASN_IPADDRESS:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "IPAddress");
break;
case ASN_OPAQUE:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "Opaque");
break;
case ASN_NSAP:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "NSAP");
break;
case ASN_OBJECT_ID:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "ObjectID");
break;
case ASN_BIT_STR:
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "BitString");
break;
}
switch ((short) vp->type)
{
case ASN_INTEGER:
vp->val.integer = (long *) vp->buf;
vp->val_len = sizeof (long);
asn_parse_int (var_val, &len, &vp->type,
(long *) vp->val.integer, sizeof (vp->val.integer));
break;
case ASN_COUNTER:
case ASN_GAUGE:
case ASN_TIMETICKS:
case ASN_UINTEGER:
vp->val.integer = (long *) vp->buf;
vp->val_len = sizeof (u_long);
asn_parse_unsigned_int (var_val, &len, &vp->type,
(u_long *) vp->val.integer,
sizeof (vp->val.integer));
break;
#ifdef OPAQUE_SPECIAL_TYPES
case ASN_OPAQUE_COUNTER64:
case ASN_OPAQUE_U64:
#endif /* OPAQUE_SPECIAL_TYPES */
case ASN_COUNTER64:
vp->val.counter64 = (struct counter64 *) vp->buf;
vp->val_len = sizeof (struct counter64);
asn_parse_unsigned_int64 (var_val, &len, &vp->type,
(struct counter64 *) vp->val.counter64,
sizeof (*vp->val.counter64));
break;
#ifdef OPAQUE_SPECIAL_TYPES
case ASN_OPAQUE_FLOAT:
vp->val.floatVal = (float *) vp->buf;
vp->val_len = sizeof (float);
asn_parse_float (var_val, &len, &vp->type,
vp->val.floatVal, vp->val_len);
break;
case ASN_OPAQUE_DOUBLE:
vp->val.doubleVal = (double *) vp->buf;
vp->val_len = sizeof (double);
asn_parse_double (var_val, &len, &vp->type,
vp->val.doubleVal, vp->val_len);
break;
case ASN_OPAQUE_I64:
vp->val.counter64 = (struct counter64 *) vp->buf;
vp->val_len = sizeof (struct counter64);
asn_parse_signed_int64 (var_val, &len, &vp->type,
(struct counter64 *) vp->val.counter64,
sizeof (*vp->val.counter64));
break;
#endif /* OPAQUE_SPECIAL_TYPES */
case ASN_OCTET_STR:
case ASN_IPADDRESS:
case ASN_OPAQUE:
case ASN_NSAP:
if (vp->val_len < sizeof (vp->buf))
{
vp->val.string = (u_char *) vp->buf;
}
else
{
vp->val.string = (u_char *) malloc ((unsigned) vp->val_len+1);
memset(vp->val.string, 0, vp->val_len+1);
}
asn_parse_string (var_val, &len, &vp->type, vp->val.string,
&vp->val_len);
break;
case ASN_OBJECT_ID:
vp->val_len = MAX_OID_LEN;
asn_parse_objid (var_val, &len, &vp->type, objid, &vp->val_len);
vp->val_len *= sizeof (oid);
vp->val.objid = (oid *) malloc ((unsigned) vp->val_len);
memmove (vp->val.objid, objid, vp->val_len);
break;
case SNMP_NOSUCHOBJECT:
case SNMP_NOSUCHINSTANCE:
case SNMP_ENDOFMIBVIEW:
case ASN_NULL:
break;
case ASN_BIT_STR:
vp->val.bitstring = (u_char *) malloc (vp->val_len);
asn_parse_bitstring (var_val, &len, &vp->type,
vp->val.bitstring, &vp->val_len);
break;
default:
fprintf(stderr, "Error: bad type returned (%x)\n", vp->type);
badtype = 1;
break;
}
if (!netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_FULL_OID))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_PRINT_FULL_OID);
}
if (!netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_NUMERIC_OIDS))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_PRINT_NUMERIC_OIDS);
}
if (!netsnmp_ds_get_boolean
(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT))
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_QUICK_PRINT);
}
if (!strcmp (_docsis_snmp_label, "String")) /* Strings need special treatment - see below */
{
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_QUICK_PRINT);
netsnmp_ds_toggle_boolean (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_ESCAPE_QUOTES);
}
switch ((short) vp->type)
{
case ASN_OCTET_STR:
if (str_isprint((char *) vp->val.string, vp->val_len))
{
snprintf(outbuf, vp->val_len+5, "\"%s\"", vp->val.string);
} else {
snprint_hexadecimal (outbuf, 16383, (char *) vp->val.string, vp->val_len);
memset (_docsis_snmp_label, 0, 50);
sprintf (_docsis_snmp_label, "HexString");
}
break;
case ASN_BIT_STR:
snprint_hexadecimal (outbuf, 1023, (char *) vp->val.bitstring, vp->val_len);
break;
case ASN_OBJECT_ID:
netsnmp_ds_set_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_NUMERIC);
snprint_value (outbuf, 1023, vp->name, vp->name_length, vp);
netsnmp_ds_set_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
NETSNMP_OID_OUTPUT_SUFFIX);
break;
default:
snprint_value (outbuf, 1023, vp->name, vp->name_length, vp);
}
if ( subtree )
{
enums = subtree->enums;
for (; enums; enums = enums->next) {
if (enums->value == *vp->val.integer) {
enum_string = enums->label;
break;
}
}
}
if (enum_string)
printf(" %s %s; /* %s */", _docsis_snmp_label, outbuf, enum_string);
else
printf(" %s %s;", _docsis_snmp_label, outbuf);
snmp_free_var (vp);
return badtype;
}
// 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);
}
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: snmp_print_value()
* Print the value into a buffer and return the buffer.
*
* Buffer is static to this function.
*
* PARAM1: u_char * var_val - ASN.1 encoded value
* PARAM1: u_char var_val_type - ASN.1 type of value
*
* RETURNS:
*/
char *
snmp_print_value(u_char *var_val, u_char var_val_type)
{
/* set an abritrarily large buffer parm for asn1 parsing.
* We don't use the returned value for this anyway.
*/
unsigned asn_buf_size = 1000; /* */
unsigned set_var_size = _MAX_PATH; /* bytes in field to set */
long tmpvalue=0;
static char datastr[_MAX_PATH];
static char datatmp[_MAX_PATH];
static oid dataoid[_MAX_PATH];
datastr[0]=0; /* null terminate */
if (!var_val)
return datastr;
switch (var_val_type)
{
case ASN_INTEGER:
case COUNTER:
case GAUGE: /* valid for GAUGE32 and UNSIGNED32 too */
case TIMETICKS:
if (!asn_parse_int(var_val, &asn_buf_size, &var_val_type,
&tmpvalue, sizeof(long)))
{
break;
}
sprintf(datastr,"%ld",tmpvalue) ;
break;
case ASN_BIT_STR:
if (!asn_parse_bits(var_val, &asn_buf_size, &var_val_type,
(unsigned char *)datatmp, &set_var_size))
{
break;
}
strcpy(datastr,datatmp);
break;
case ASN_OCTET_STR:
case IPADDRESS:
case OPAQUE:
if (!asn_parse_string(var_val, &asn_buf_size, &var_val_type,
(unsigned char *)datatmp, &set_var_size))
{
break;
}
*(datatmp + set_var_size) = '\0'; /* null terminate the strings */
strcpy(datastr,datatmp);
break;
case ASN_OBJECT_ID:
if (!asn_parse_objid(var_val, &asn_buf_size, &var_val_type,
dataoid, &set_var_size))
{
break;
}
strcpy(datastr, print_oid(dataoid, set_var_size));
break;
case ASN_NULL:
strcpy (datastr, "<NULL>");
break;
}
return datastr;
}
//*
//*---------------------------------------------------------------------------------
//* 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);
}
