z/OS Communications Server: IP Programmer's Guide and Reference
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Application data format for CSSMTP

z/OS Communications Server: IP Programmer's Guide and Reference
SC27-3659-02

Forty bytes of application data are available for Netstat reports, SMF119 TCP connection termination reports, or network management interface (NMI) applications. Table 1 and Table 2 shows the application data format used by CSSMTP. This data is written at the beginning of each successful target server connection.

Table 1. Connections transferring message data
Bytes Description
1-8 The component ID of the CSSMTP application, EZASMTPC.
9 Blank
10-17 The external writer name used to queue the JES spool files to CSSMTP
18 Blank
19 The type of server connection, otherwise blank if undetermined:

S -- SMTP server

E -- ESMTP server

20 The security method used for the TCP/IP connection, otherwise blank if undetermined:

B - Basic (no security)

T - TTLS port managed by AT-TLS

21-22 The security level, otherwise blank if undetermined:

T1 - TLSv1

11 - TLSv1.1

12 - TLSv1.2

S3 - SSLv3

S2 - SSLv2

23-24 The security cipher used, otherwise blank if undetermined. If the value is 4X, the security cipher must be obtained from offset 26.
25 Blank
26-29 The four byte security cipher that is used; blank if undetermined.
30-40 Reserved
The following example shows the application data after a CSSMTP session has ended.
0000000001111111111222222222233333333334
1234567890123456789012345678901234567890
EZASMTPC XYZ      ETT101 0001    
Table 2. Connections monitoring target servers
Bytes Description
1-8 The component ID of the CSSMTP application, EZASMTPM.
9 Blank
10-17 The external writer name used to queue the JES spool files to CSSMTP
18 Blank
19 The type of server connection, otherwise blank if undetermined:

S -- SMTP server

E -- ESMTP server

20 The security method used for the TCP/IP connection, otherwise blank if undetermined:

B - Basic (no security)

T - TTLS port managed by AT-TLS

21-22 The security level, otherwise blank if undetermined:

T1 - TLSv1

11 - TLSv1.1

12 - TLSv1.2

S3 - SSLv3

S2 - SSLv2

23-24 The security cipher used, otherwise blank if undetermined. If the value is 4X, the security cipher must be obtained from offset 26.
25 Blank
26-29 The security cipher used, otherwise blank if undetermined.
30-40 Reserved
The following example shows the application data after a CSSMTP session has ended.
0000000001111111111222222222233333333334
1234567890123456789012345678901234567890
EZASMTPM XYZ      ETT101 0001               

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