表达式TCP、UDP和VLAN数据
TCP and UDP data take the form of a string or a number. For expression prefixes that return string values for TCP and UDP data, you can apply any text-based operations. For more information, seeAdvanced policy expressions: Evaluating text.
For expression prefixes that return numeric value, such as a source port, you can apply an arithmetic operation. For more information, seeBasic operations on expression prefixesandCompound operations for numbers.
The following table describes prefixes that extract TCP and UDP data.
得到工作on | Description |
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CLIENT.TCP.PAYLOAD( |
Returns TCP payload data as a string, starting with the first character in the payload and continuing for the number of characters in the argument. You can apply any text-based operation to this prefix. |
CLIENT.TCP.SRCPORT | Returns the ID of the current packet’s source port as a number. |
CLIENT.TCP.DSTPORT | Returns the ID of the current packet’s destination port as a number. |
CLIENT.TCP.OPTIONS | Returns the TCP options set by the client. Examples of TCP options are Maximum Segment Size (MSS), Window Scale, Selective Acknowledgements (SACK), and Time Stamp Option. The COUNT, TYPE( |
CLIENT.TCP.OPTIONS.COUNT | Returns the number of TCP options that the client has set. |
CLIENT.TCP.OPTIONS.TYPE( |
Returns the value of the TCP option whose type (or option kind) is specified as the argument. The value is returned as a string of bytes in big endian format (or network byte order). Parameters: type - Type value |
CLIENT.TCP.OPTIONS.TYPE_NAME( |
Returns the value of the TCP option whose enumeration constant is specified as the argument. The enumeration constants that you can pass as the argument are REPEATER, TIMESTAMP, SACK_PERMITTED, WINDOW, and MAXSEG. To specify the TCP option kind instead of these enumeration constants, use CLIENT.TCP.OPTIONS.TYPE( |
CLIENT.TCP.REPEATER_OPTION.EXISTS | Returns a Boolean TRUE if Repeater TCP options exist. |
CLIENT.TCP.REPEATER_OPTION.IP | Returns the branch repeater’s IPv4 address from the Repeater TCP options. |
CLIENT.TCP.REPEATER_OPTION.MAC | Returns the branch repeater’s MAC address from the Repeater TCP options. |
CLIENT.UDP.DNS.DOMAIN | Returns the DNS domain name. |
CLIENT.UDP.DNS.DOMAIN.EQ(“ |
Returns a Boolean TRUE if the domain name matches the |
CLIENT.UDP.DNS.IS_AAAAREC | Returns a Boolean TRUE if the record type is AAAA. These types of records indicate an IPv6 address in forward lookups. |
CLIENT.UDP.DNS.IS_ANYREC | Returns a Boolean TRUE if it is of any record type. |
CLIENT.UDP.DNS.IS_AREC | Returns a Boolean TRUE if the record is type A. Type A records provide the host address. |
CLIENT.UDP.DNS.IS_CNAMEREC | Returns a Boolean TRUE if the record is of type CNAME. In systems that use multiple names to identify a resource, there is one canonical name and a number of aliases. The CNAME provides the canonical name. |
CLIENT.UDP.DNS.IS_MXREC | Returns a Boolean TRUE if the record is of type MX (mail exchanger). This DNS record describes a priority and a host name. The MX records for the same domain name specify the email servers in the domain and the priority for each server. |
CLIENT.UDP.DNS.IS_NSREC | Returns a Boolean TRUE if the record is of type NS. This is a name server record that includes a host name with an associated A record. This enables locating the domain name that is associated with the NS record. |
CLIENT.UDP.DNS.IS_PTRREC | Returns a Boolean TRUE if the record is of type PTR. This is a domain name pointer and is often used to associate a domain name with an IPv4 address. |
CLIENT.UDP.DNS.IS_SOAREC | Returns a Boolean TRUE if the record is of type SOA. This is a start of authority record. |
CLIENT.UDP.DNS.IS_SRVREC | Returns a Boolean TRUE if the record is of type SRV. This is a more general version of the MX record. |
CLIENT.UDP.DSTPORT | Returns the numeric ID of the current packet’s UDP destination port. |
CLIENT.UDP.SRCPORT | Returns the numeric ID of the current packet’s UDP source port. |
CLIENT.UDP.RADIUS | Returns RADIUS data for the current packet. |
CLIENT.UDP.RADIUS.ATTR_TYPE( |
Returns the value for the attribute type specified as the argument. |
CLIENT.UDP.RADIUS.USERNAME | Returns the RADIUS user name. |
CLIENT.TCP.MSS | Returns the maximum segment size (MSS) for the current connection as a number. |
CLIENT.VLAN.ID | Returns the numeric ID of the VLAN through which the current packet entered the Citrix ADC. |
SERVER.TCP.DSTPORT | Returns the numeric ID of the current packet’s destination port. |
SERVER.TCP.SRCPORT | Returns the numeric ID of the current packet’s source port. |
SERVER.TCP.OPTIONS | Returns the TCP options set by the server. Examples of TCP options are Maximum Segment Size (MSS), Window Scale, Selective Acknowledgements (SACK), and Time Stamp Option. The COUNT, TYPE( |
SERVER.TCP.OPTIONS.COUNT | Returns the number of TCP options that the server has set. |
SERVER.TCP.OPTIONS.TYPE( |
Returns the value of the TCP option whose type (or option kind) is specified as the argument. The value is returned as a string of bytes in big endian format (or network byte order). Parameters: type - Type value |
SERVER.TCP.OPTIONS.TYPE_NAME( |
Returns the value of the TCP option whose enumeration constant is specified as the argument. The enumeration constants that you can pass as the argument are REPEATER, TIMESTAMP, SACK_PERMITTED, WINDOW, and MAXSEG. To specify the TCP option kind instead of these enumeration constants, use CLIENT.TCP.OPTIONS.TYPE( |
SERVER.VLAN | Operates on the VLAN through which the current packet entered the Citrix ADC. |
SERVER.VLAN.ID | Returns the numeric ID of the VLAN through which the current packet entered the Citrix ADC. |
表达式TCP、UDP和VLAN数据
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