unsigned int send_request(Options *options, int socket, char *agent_host, int agent_port, char *oid)
{
SNMPMessage *message;
int len;
unsigned char *buf;
unsigned long int request_id = next_request_id++;
message = snmp_create_message();
snmp_set_version(message, 0);
snmp_set_community(message, "public");
snmp_set_pdu_type(message, SNMP_GET_REQUEST_TYPE);
snmp_set_request_id(message, request_id);
snmp_set_error(message, 0);
snmp_set_error_index(message, 0);
snmp_add_varbind_null(message, oid);
len = snmp_message_length(message);
buf = malloc(len);
snmp_render_message(message, buf);
if (options->verbose)
snmp_print_message(message, stderr);
snmp_destroy_message(message);
if (options->verbose)
fprintf(stderr, "Sending datagram to %s:%d\n", agent_host, agent_port);
send_udp_datagram(buf, len, socket, agent_host, agent_port);
free(buf);
return request_id;
}
static int /* O - 0 on success, -1 on error */
asn1_decode_snmp(unsigned char *buffer, /* I - Buffer */
size_t len, /* I - Size of buffer */
cups_snmp_t *packet) /* I - SNMP packet */
{
unsigned char *bufptr, /* Pointer into the data */
*bufend; /* End of data */
int length; /* Length of value */
/*
* Initialize the decoding...
*/
memset(packet, 0, sizeof(cups_snmp_t));
packet->object_name[0] = -1;
bufptr = buffer;
bufend = buffer + len;
if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_SEQUENCE)
snmp_set_error(packet, _("Packet does not start with SEQUENCE"));
else if (asn1_get_length(&bufptr, bufend) == 0)
snmp_set_error(packet, _("SEQUENCE uses indefinite length"));
else if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_INTEGER)
snmp_set_error(packet, _("No version number"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("Version uses indefinite length"));
else if ((packet->version = asn1_get_integer(&bufptr, bufend, length))
!= CUPS_SNMP_VERSION_1)
snmp_set_error(packet, _("Bad SNMP version number"));
else if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_OCTET_STRING)
snmp_set_error(packet, _("No community name"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("Community name uses indefinite length"));
else
{
asn1_get_string(&bufptr, bufend, length, packet->community,
sizeof(packet->community));
if ((packet->request_type = asn1_get_type(&bufptr, bufend))
!= CUPS_ASN1_GET_RESPONSE)
snmp_set_error(packet, _("Packet does not contain a Get-Response-PDU"));
else if (asn1_get_length(&bufptr, bufend) == 0)
snmp_set_error(packet, _("Get-Response-PDU uses indefinite length"));
else if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_INTEGER)
snmp_set_error(packet, _("No request-id"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("request-id uses indefinite length"));
else
{
packet->request_id = asn1_get_integer(&bufptr, bufend, length);
if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_INTEGER)
snmp_set_error(packet, _("No error-status"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("error-status uses indefinite length"));
else
{
packet->error_status = asn1_get_integer(&bufptr, bufend, length);
if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_INTEGER)
snmp_set_error(packet, _("No error-index"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("error-index uses indefinite length"));
else
{
packet->error_index = asn1_get_integer(&bufptr, bufend, length);
if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_SEQUENCE)
snmp_set_error(packet, _("No variable-bindings SEQUENCE"));
else if (asn1_get_length(&bufptr, bufend) == 0)
snmp_set_error(packet,
_("variable-bindings uses indefinite length"));
else if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_SEQUENCE)
snmp_set_error(packet, _("No VarBind SEQUENCE"));
else if (asn1_get_length(&bufptr, bufend) == 0)
snmp_set_error(packet, _("VarBind uses indefinite length"));
else if (asn1_get_type(&bufptr, bufend) != CUPS_ASN1_OID)
snmp_set_error(packet, _("No name OID"));
else if ((length = asn1_get_length(&bufptr, bufend)) == 0)
snmp_set_error(packet, _("Name OID uses indefinite length"));
else
{
asn1_get_oid(&bufptr, bufend, length, packet->object_name,
CUPS_SNMP_MAX_OID);
packet->object_type = asn1_get_type(&bufptr, bufend);
if ((length = asn1_get_length(&bufptr, bufend)) == 0 &&
packet->object_type != CUPS_ASN1_NULL_VALUE &&
packet->object_type != CUPS_ASN1_OCTET_STRING)
snmp_set_error(packet, _("Value uses indefinite length"));
else
{
switch (packet->object_type)
{
case CUPS_ASN1_BOOLEAN :
packet->object_value.boolean =
asn1_get_integer(&bufptr, bufend, length);
break;
case CUPS_ASN1_INTEGER :
packet->object_value.integer =
asn1_get_integer(&bufptr, bufend, length);
break;
case CUPS_ASN1_NULL_VALUE :
break;
case CUPS_ASN1_OCTET_STRING :
case CUPS_ASN1_BIT_STRING :
case CUPS_ASN1_HEX_STRING :
packet->object_value.string.num_bytes = length;
asn1_get_string(&bufptr, bufend, length,
(char *)packet->object_value.string.bytes,
sizeof(packet->object_value.string.bytes));
break;
case CUPS_ASN1_OID :
asn1_get_oid(&bufptr, bufend, length,
packet->object_value.oid, CUPS_SNMP_MAX_OID);
break;
case CUPS_ASN1_COUNTER :
packet->object_value.counter =
asn1_get_integer(&bufptr, bufend, length);
break;
case CUPS_ASN1_GAUGE :
packet->object_value.gauge =
asn1_get_integer(&bufptr, bufend, length);
break;
case CUPS_ASN1_TIMETICKS :
packet->object_value.timeticks =
asn1_get_integer(&bufptr, bufend, length);
break;
default :
snmp_set_error(packet, _("Unsupported value type"));
break;
}
}
}
}
}
}
}
return (packet->error ? -1 : 0);
}
