sd_bus_creds_get_pid, sd_bus_creds_get_pid_starttime, sd_bus_creds_get_tid, sd_bus_creds_get_uid, sd_bus_creds_get_gid, sd_bus_creds_get_comm, sd_bus_creds_get_tid_comm, sd_bus_creds_get_exe, sd_bus_creds_get_cmdline, sd_bus_creds_get_cgroup, sd_bus_creds_get_unit, sd_bus_creds_get_user_unit, sd_bus_creds_get_slice, sd_bus_creds_get_session, sd_bus_creds_get_owner_uid, sd_bus_creds_has_effective_cap, sd_bus_creds_has_permitted_cap, sd_bus_creds_has_inheritable_cap, sd_bus_creds_has_bounding_cap, sd_bus_creds_get_selinux_context, sd_bus_creds_get_audit_session_id, sd_bus_creds_get_audit_login_uid, sd_bus_creds_get_unique_name, sd_bus_creds_get_well_known_names, sd_bus_creds_get_connection_name — Retrieve fields from a credentials object
#include <systemd/sd-bus.h>
int sd_bus_creds_get_pid( | sd_bus_creds *c, |
pid_t *pid) ; |
int sd_bus_creds_get_pid_starttime( | sd_bus_creds *c, |
uint64_t *usec) ; |
int sd_bus_creds_get_tid( | sd_bus_creds *c, |
pid_t *tid) ; |
int sd_bus_creds_get_pid( | sd_bus_creds *c, |
uid_t *uid) ; |
int sd_bus_creds_get_gid( | sd_bus_creds *c, |
gid_t *gid) ; |
int sd_bus_creds_get_comm( | sd_bus_creds *c, |
const char **comm) ; |
int sd_bus_creds_get_tid_comm( | sd_bus_creds *c, |
const char **comm) ; |
int sd_bus_creds_get_exe( | sd_bus_creds *c, |
const char **exe) ; |
int sd_bus_creds_get_cmdline( | sd_bus_creds *c, |
char ***cmdline) ; |
int sd_bus_creds_get_cgroup( | sd_bus_creds *c, |
const char **cgroup) ; |
int sd_bus_creds_get_unit( | sd_bus_creds *c, |
const char **unit) ; |
int sd_bus_creds_get_user_unit( | sd_bus_creds *c, |
const char **unit) ; |
int sd_bus_creds_get_slice( | sd_bus_creds *c, |
const char **slice) ; |
int sd_bus_creds_get_session( | sd_bus_creds *c, |
const char **slice) ; |
int sd_bus_creds_get_owner_uid( | sd_bus_creds *c, |
uid_t *uid) ; |
int sd_bus_creds_has_effective_cap( | sd_bus_creds *c, |
int capability) ; |
int sd_bus_creds_has_permitted_cap( | sd_bus_creds *c, |
int capability) ; |
int sd_bus_creds_has_inheritable_cap( | sd_bus_creds *c, |
int capability) ; |
int sd_bus_creds_has_bounding_cap( | sd_bus_creds *c, |
int capability) ; |
int sd_bus_creds_get_selinux_context( | sd_bus_creds *c, |
const char **context) ; |
int sd_bus_creds_get_audit_session_id( | sd_bus_creds *c, |
uint32_t *sessionid) ; |
int sd_bus_creds_get_audit_login_uid( | sd_bus_creds *c, |
uid_t *loginuid) ; |
int sd_bus_creds_get_unique_name( | sd_bus_creds *c, |
const char **name) ; |
int sd_bus_creds_get_well_known_names( | sd_bus_creds *c, |
char ***name) ; |
int sd_bus_creds_get_connection_name( | sd_bus_creds *c, |
const char **name) ; |
These functions return information from an
sd_bus_creds
object. It may be created with
sd_bus_creds_new_from_pid(3),
in which case it will describe the specified process, or it may be
created by
sd_bus_get_owner_creds(3),
in which case it will describe the process at the other endpoint
of a connection.
sd_bus_creds_get_pid()
will retrieve the
PID (process identifier).
sd_bus_creds_get_pid_starttime()
will
retrieve the time since the start of the epoch in microseconds
since the process was started.
sd_bus_creds_get_tid()
will retrieve the
TID (thread identifier).
sd_bus_creds_get_uid()
will retrieve the
numeric UID (user identifier).
sd_bus_creds_get_gid()
will retrieve the
numeric GID (group identifier).
sd_bus_creds_get_comm()
will retrieve the
comm field (truncated name of the executable, as stored in
/proc/
).
pid
/comm
sd_bus_creds_get_tid_comm()
will retrieve
the comm field of the thread (as stored in
/proc/
).
pid
/task/tid
/comm
sd_bus_creds_get_exe()
will retrieve the
path to the program (as stored in the
/proc/
link, but with "pid
/exe (deleted)
" suffix removed).
sd_bus_creds_get_cmdline()
will retrieve
an array of command-line arguments (as stored in
/proc/
).
pid
/cmdline
sd_bus_creds_get_cgroup()
will retrieve
the cgroup path. See cgroups.txt.
sd_bus_creds_get_unit()
will retrieve the
systemd unit name (in the system instance of systemd) that the
process is part of. See
systemd.unit(5).
sd_bus_creds_get_user_unit()
will
retrieve the systemd unit name (in the user instance of systemd)
that the process is part of. See
systemd.unit(5).
sd_bus_creds_get_slice()
will retrieve
the systemd slice (a unit in the system instance of systemd) that
the process is part of. See
systemd.slice(5).
sd_bus_creds_get_session()
will retrieve
the logind session that the process is part of. See
systemd-logind.service(8).
sd_bus_creds_get_owner_uid()
will retrieve
the numeric UID (user identifier) of the user who owns the slice
that the process is part of. See
systemd.slice(5)
.
sd_bus_creds_has_effective_cap()
will
check whether the capability specified by
capability
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
capabilities(7)
and Capabilities=
and
CapabilityBoundingSet=
settings in
systemd.exec(5).
sd_bus_creds_has_permitted_cap()
is
similar to sd_bus_creds_has_effective_cap()
,
but will check the permitted capabilities mask.
sd_bus_creds_has_inheritable_cap()
is
similar to sd_bus_creds_has_effective_cap()
,
but will check the inheritable capabilities mask.
sd_bus_creds_has_bounding_cap()
is
similar to sd_bus_creds_has_effective_cap()
,
but will check the bounding capabilities mask.
sd_bus_creds_get_selinux_context()
will
retrieve the SELinux security context (label) of the process.
sd_bus_creds_get_audit_session_id()
will
retrieve the audit session identifier of the process.
sd_bus_creds_get_audit_login_uid()
will
retrieve the audit user login identifier (the identifier of the
user who is "responsible" for the session).
sd_bus_creds_get_unique_name()
will
retrieve the D-Bus unique name. See The
D-Bus specification.
sd_bus_creds_get_well_known_names()
will
retrieve the set of D-Bus well-known names. See The
D-Bus specification.
sd_bus_creds_get_connection_name()
will
retrieve a descriptive name of the bus connection of the
peer. This name is useful to discern multiple bus connections by
the same peer, and may be altered by the peer with the
sd_bus_set_name()(3)
call.
All functions that take a const
char**
parameter will store the answer there as an
address of a NUL-terminated string. It will be valid as long as
c
remains valid, and should not be freed or
modified by the caller.
All functions that take a char***
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
c
remains valid, and should not be freed or
modified by the caller.
On success, these calls return 0 or a positive integer. On failure, these calls return a negative errno-style error code.
Returned errors may indicate the following problems:
-ENODATA
¶Given field is not available in
c
.
-ENOENT
¶Given field is not specified for the sender.
This will be returned by sd_bus_get_unit()
,
sd_bus_get_user_unit()
,
sd_bus_get_slice()
,
sd_bus_get_session()
, and
sd_bus_get_name_creds_uid()
if the sender is not
part of a systemd system unit, systemd user unit, systemd
slice, logind session, or a systemd user session.
-ENXIO
¶An error occurred in parsing cgroup paths.
libsystemd
might be out of sync with
the running systemd version.
-EINVAL
¶Specified pointer parameter is NULL
.
-ENOMEM
¶Memory allocation failed.
sd_bus_open_user()
and other functions
described here are available as a shared library, which can be
compiled and linked to with the
libsystemd
pkg-config(1)
file.
systemd(1), sd-bus(3), fork(2), execve(2), credentials(7), free(3), proc(5), systemd.journald-fields(7)