summaryrefslogtreecommitdiff
path: root/man/sd_bus_creds_get_pid.xml
blob: 40ed81ecb0b8404875a641fcfee34441f9076d2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<!--
This file is part of systemd.

Copyright 2014 Zbigniew Jędrzejewski-Szmek

systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->

<refentry id="sd_bus_creds_get_pid" conditional="ENABLE_KDBUS">

  <refentryinfo>
    <title>sd_bus_creds_get_pid</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>A monkey with a typewriter</contrib>
        <firstname>Zbigniew</firstname>
        <surname>Jędrzejewski-Szmek</surname>
        <email>zbyszek@in.waw.pl</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_creds_get_pid</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_creds_get_pid</refname>
    <refname>sd_bus_creds_get_pid_starttime</refname>
    <refname>sd_bus_creds_get_tid</refname>
    <refname>sd_bus_creds_get_uid</refname>
    <refname>sd_bus_creds_get_gid</refname>
    <refname>sd_bus_creds_get_comm</refname>
    <refname>sd_bus_creds_get_tid_comm</refname>
    <refname>sd_bus_creds_get_exe</refname>
    <refname>sd_bus_creds_get_cmdline</refname>
    <refname>sd_bus_creds_get_cgroup</refname>
    <refname>sd_bus_creds_get_unit</refname>
    <refname>sd_bus_creds_get_user_unit</refname>
    <refname>sd_bus_creds_get_slice</refname>
    <refname>sd_bus_creds_get_session</refname>
    <refname>sd_bus_creds_get_owner_uid</refname>
    <refname>sd_bus_creds_has_effective_cap</refname>
    <refname>sd_bus_creds_has_permitted_cap</refname>
    <refname>sd_bus_creds_has_inheritable_cap</refname>
    <refname>sd_bus_creds_has_bounding_cap</refname>
    <refname>sd_bus_creds_get_selinux_context</refname>
    <refname>sd_bus_creds_get_audit_session_id</refname>
    <refname>sd_bus_creds_get_audit_login_uid</refname>
    <refname>sd_bus_creds_get_unique_name</refname>
    <refname>sd_bus_creds_get_well_known_names</refname>

    <refpurpose>Retrieve fields from a credentials object</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>pid_t *<parameter>pid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_pid_starttime</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>uint64_t *<parameter>usec</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_tid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>pid_t *<parameter>tid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>uid_t *<parameter>uid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_gid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>comm</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_tid_comm</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>comm</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_exe</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>exe</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>char ***<parameter>cmdline</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>cgroup</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_unit</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>unit</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_user_unit</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>unit</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_slice</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>slice</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_session</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>slice</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_owner_uid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>uid_t *<parameter>uid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_has_effective_cap</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>int <parameter>capability</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_has_permitted_cap</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>int <parameter>capability</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_has_inheritable_cap</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>int <parameter>capability</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_has_bounding_cap</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>int <parameter>capability</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_selinux_context</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>context</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_audit_session_id</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>uint32_t *<parameter>sessionid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_audit_login_uid</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>uid_t *<parameter>loginuid</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_unique_name</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>const char **<parameter>name</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_creds_get_well_known_names</function></funcdef>
        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
        <paramdef>char ***<parameter>name</parameter></paramdef>
      </funcprototype>

    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>These functions return information from an
    <parameter>sd_bus_creds</parameter> object. It may be created with
    <citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    in which case it will describe the specified process, or it may be
    created by
    <citerefentry><refentrytitle>sd_bus_get_peer_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    in which case it will describe the process at the other endpoint
    of a connection.
    </para>

    <para><function>sd_bus_creds_get_pid</function> will retrieve the
    PID (process identifier).</para>

    <para><function>sd_bus_creds_get_pid_starttime</function> will
    retrieve the time since the start of the epoch in microseconds
    since the process was started.</para>

    <para><function>sd_bus_creds_get_tid</function> will retrieve the
    TID (thread identifier).</para>

    <para><function>sd_bus_creds_get_uid</function> will retrieve the
    numeric UID (user identifier).</para>

    <para><function>sd_bus_creds_get_gid</function> will retrieve the
    numeric GID (group identifier).</para>

    <para><function>sd_bus_creds_get_comm</function> will retrieve the
    comm field (truncated name of the executable, as stored in
    <filename>/proc/<replaceable>pid</replaceable>/comm</filename>).
    </para>

    <para><function>sd_bus_creds_get_tid_comm</function> will retrieve
    the comm field of the thread (as stored in
    <filename>/proc/<replaceable>pid</replaceable>/task/<replaceable>tid</replaceable>/comm</filename>).
    </para>

    <para><function>sd_bus_creds_get_exe</function> will retrieve the
    path to the program (as stored in the
    <filename>/proc/<replaceable>pid</replaceable>/exe</filename>
    link, but with <literal> (deleted)</literal> suffix removed).
    </para>

    <para><function>sd_bus_creds_get_cmdline</function> will retrieve
    an array of command-line arguments (as stored in
    <filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>).
    </para>

    <para><function>sd_bus_creds_get_cgroup</function> will retrieve
    the cgroup path. See <ulink
    url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>.
    </para>

    <para><function>sd_bus_creds_get_unit</function> will retrieve the
    systemd unit name (in the system instance of systemd) that the
    process is part of. See
    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
    </para>

    <para><function>sd_bus_creds_get_user_unit</function> will
    retrieve the systemd unit name (in the user instance of systemd)
    that the process is part of. See
    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
    </para>

    <para><function>sd_bus_creds_get_slice</function> will retrieve
    the systemd slice (a unit in the system instance of systemd) that
    the process is part of. See
    <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
    </para>

    <para><function>sd_bus_creds_get_session</function> will retrieve
    the logind session that the process is part of. See
    <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
    </para>

    <para><function>sd_bus_creds_get_owner_uid</function> will retrieve
    the numeric UID (user identifier) of the user who owns the slice
    that the process is part of. See
    <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    <!-- and
    <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> -->.
    </para>

    <para><function>sd_bus_creds_has_effective_cap</function> will
    check whether the capability specified by
    <parameter>capability</parameter> was set in the effective
    capabilities mask. A positive return value means that is was
    set, zero means that it was not set, and a negative return
    value signifies an error. See
    <citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
    and <varname>Capabilities=</varname> and
    <varname>CapabilityBoundingSet=</varname> settings in
    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
    </para>

    <para><function>sd_bus_creds_has_permitted_cap</function> is
    similar to <function>sd_bus_creds_has_effective_cap</function>,
    but will check the permitted capabilities mask.</para>

    <para><function>sd_bus_creds_has_inheritable_cap</function> is
    similar to <function>sd_bus_creds_has_effective_cap</function>,
    but will check the inheritable capabilities mask.</para>

    <para><function>sd_bus_creds_has_bounding_cap</function> is
    similar to <function>sd_bus_creds_has_effective_cap</function>,
    but will check the bounding capabilities mask.</para>

    <para><function>sd_bus_creds_get_selinux_context</function> will
    retrieve the SELinux security context (label) of the process.</para>

    <para><function>sd_bus_creds_get_audit_session_id</function> will
    retrieve the audit session identifier of the process.</para>

    <para><function>sd_bus_creds_get_audit_login_uid</function> will
    retrieve the audit user login identifier (the identifier of the
    user who is "responsible" for the session).</para>

    <para><function>sd_bus_creds_get_unique_name</function> will
    retrieve the D-Bus unique name. See <ulink
    url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
    D-Bus specification</ulink>.</para>

    <para><function>sd_bus_creds_get_well_known_names</function> will
    retrieve the set of D-Bus well-known names. See <ulink
    url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
    D-Bus specification</ulink>.</para>

    <para>All functions that take a <parameter>const
    char**</parameter> parameter will store the answer there as an
    address of a NUL-terminated string. It will be valid as long as
    <parameter>c</parameter> remains valid, and should not be freed or
    modified by the caller.</para>

    <para>All functions that take a <parameter>char***</parameter>
    parameter will store the answer there as an address of a an array
    of strings. Each invidividual string is NUL-terminated, and the
    array is NULL-terminated as a whole. It will be valid as long as
    <parameter>c</parameter> remains valid, and should not be freed or
    modified by the caller.</para>
  </refsect1>

  <refsect1>
    <title>Return Value</title>

    <para>On success, these calls return 0 or a positive integer. On
    failure, these calls return a negative errno-style error code.
    </para>
  </refsect1>

  <refsect1>
    <title>Errors</title>

    <para>Returned errors may indicate the following problems:</para>

    <variablelist>
      <varlistentry>
        <term><varname>-ENODATA</varname></term>

        <listitem><para>Given field is not available in
        <parameter>c</parameter>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>-ENOENT</varname></term>

        <listitem><para>Given field is not specified for the sender.
        This will be returned by <function>sd_bus_get_unit</function>,
        <function>sd_bus_get_user_unit</function>,
        <function>sd_bus_get_slice</function>,
        <function>sd_bus_get_session</function>, and
        <function>sd_bus_get_owner_uid</function> if the sender is not
        part of a systemd system unit, systemd user unit, systemd
        slice, logind session, or a systemd user session.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>-ENXIO</varname></term>

        <listitem><para>An error occurred in parsing cgroup paths.
        <filename>libsystemd</filename> might be out of sync with
        the running systemd version.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>-EINVAL</varname></term>

        <listitem><para>Specified pointer parameter is <constant>NULL</constant>.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>-ENOMEM</varname></term>

        <listitem><para>Memory allocation failed.</para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Notes</title>

    <para><function>sd_bus_open_user()</function> and other functions
    described here are available as a shared library, which can be
    compiled and linked to with the
    <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    file.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>

    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>fork</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
      <citerefentry project='man-pages'><refentrytitle>credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
      <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry project='man-pages'><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd.journald-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>