1TSS2_TCTI_TABRMD_INIT(3)      TPM2 Software Stack     TSS2_TCTI_TABRMD_INIT(3)
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NAME

6       Tss2_Tcti_Tabrmd_Init - Initialization function for the tpm2-abrmd TCTI
7       library.
8

SYNOPSIS

10       The Tss2_Tcti_Tabrmd_Init() function is used to initialize a TCTI  con‐
11       text for communication with the tpm2-abrmd(8).
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13       #include <tcti/tcti-tabrmd.h>
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15       TSS2_RC  Tss2_Tcti_Tabrmd_Init (TSS2_TCTI_CONTEXT *tcti_context, size_t
16       *size, const char *conf);
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18

DESCRIPTION

20       Tss2_Tcti_Tabrmd_Init()  attempts  to  initialize  a  caller  allocated
21       tcti_context  of size size with configuration specified in the configu‐
22       ration string conf.  . Since the tcti_context must be  a  caller  allo‐
23       cated  buffer,  the  caller needs to know the size required by the TCTI
24       library. The minimum size of this context can be discovered by  provid‐
25       ing  NULL for the tcti_context and a non- NULL size parameter. The ini‐
26       tialization function will then populate the  size  parameter  with  the
27       minimum  size of the tcti_context buffer. The caller my then allocate a
28       buffer of this size (or larger) and call tss2_Tcti_Tabrmd_Init () again
29       providing the newly allocated tcti_context and the size of this context
30       in the size parameter. This pattern is common to all  TCTI  initializa‐
31       tion  functions.  We  provide  an  example  of  this  pattern using the
32       Tss2_Tcti_Tabrmd_Init() function in the section titled EXAMPLE.
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34       The conf parameter is a string of key  /  value  pairs  describing  the
35       desired  connection  properties  for the TCTI. If the caller provides a
36       NULL conf string then defaults that correspond to the defaults for  the
37       tpm2-abrmd  (8)  will  be  used. This is the same as providing the conf
38       string: "bus_name=com.intel.tss2.Tabrmd,bus_type=system". Keys and val‐
39       ues  are  separated by the '=' character while each key / value pair is
40       separated by the ',' character. The supported keys and values are:
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42       · bus_name - the dbus name owned by the daemon. See the tpm2-abrmd  (8)
43         --dbus-name option.
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45       · bus_type  - the bus type used for the connection with the daemon. The
46         value associated with this key may be either "system" or "session".
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48Once initialized, the TCTI context  returned  exposes  the  Trusted  Computing
49Group  (TCG)  defined  API  for  the  lowest level communication with the TPM.
50Using this API the caller can exchange  (send  /  receive)  TPM2  command  and
51response  buffers  with  the tpm2-abrmd (8).  In nearly all cases however, the
52caller will initialize a context using this function before passing  the  con‐
53text to a higher level API like the System API (SAPI), and then never touch it
54again.
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56For a more thorough discussion of the TCTI API see the “TSS System  Level  API
57and  TPM  Command  Transmission Interface Specification” specification as pub‐
58lished                     by                     the                     TCG:
59https://trustedcomputinggroup.org/tss-system-level-api-tpm-command-transmission-interface-specification/
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RETURN VALUE

64       A successful call to Tss2_Tcti_Tabrmd_Init() will  return  TSS2_RC_SUC‐
65       CESS.   An  unsuccessful call will produce a response code described in
66       section ERRORS.
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ERRORS

69       TSS2_TCTI_RC_BAD_VALUE is returned if the size parameter is NULL.
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71       TSS2_TCTI_RC_NO_CONNECTION is  returned  when  communication  with  the
72       tpm2-abrmd (8) fails.
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74       TSS2_TCTI_RC_GENERAL_FAILURE is returned for all other errors.
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EXAMPLE

78       #include <inttypes.h>
79       #include <stdlib.h>
80       #include <stdio.h>
81       #include <tcti/tcti-tabrmd.h>
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83       TSS2_RC rc;
84       TSS2_TCTI_CONTEXT *tcti_context;
85       size_t size;
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87       rc = tss2_tcti_tabrmd_init (NULL, &size, NULL,
88       if (rc != TSS2_RC_SUCCESS) {
89           fprintf (stderr, "Failed to get allocation size for tabrmd TCTI "
90                    " context: 0x%" PRIx32 "0, rc);
91           exit (EXIT_FAILURE);
92       }
93       tcti_context = calloc (1, size);
94       if (tcti_context == NULL) {
95           fprintf (stderr, "Allocation for TCTI context failed: %s0,
96                    strerror (errno));
97           exit (EXIT_FAILURE);
98       }
99       rc = tss2_tcti_tabrmd_init (tcti_context, &size, NULL);
100       if (rc != TSS2_RC_SUCCESS) {
101           fprintf (stderr, "Failed to initialize tabrmd TCTI context: "
102                    "0x%" PRIx32 "0, rc);
103           free (tcti_context);
104           exit (EXIT_FAILURE);
105       }
106       exit (EXIT_SUCCESS);
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AUTHOR

109       Philip Tricca <philip.b.tricca@intel.com>
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SEE ALSO

112       tcti-tabrmd(7), tpm2-abrmd(8)
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COLOPHON

115       This  page is part of the 2.0.0 release of Intel's TPM2 Access Broker &
116       Resource Management Daemon. A description of the  project,  information
117       about  reporting bugs, and the latest version of this page can be found
118       at https://github.com/01org/tpm2-abrmd/.
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122Intel                             APRIL 2018          TSS2_TCTI_TABRMD_INIT(3)
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