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logind: introduce libsystemd-login.so as fast path to access logind data

This commit is contained in:
Lennart Poettering 2011-07-14 22:50:01 +02:00
parent 0a55b298d9
commit 74b91131ed
8 changed files with 507 additions and 3 deletions
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2
.gitignore vendored
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@ -1,3 +1,5 @@
libsystemd-login.pc
test-login
systemd-loginctl
systemd-localed
systemd-timedated

47
Makefile.am
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@ -19,6 +19,10 @@ ACLOCAL_AMFLAGS = -I m4
SUBDIRS = po
LIBSYSTEMD_LOGIN_CURRENT=0
LIBSYSTEMD_LOGIN_REVISION=0
LIBSYSTEMD_LOGIN_AGE=0
# Dirs of external packages
dbuspolicydir=@dbuspolicydir@
dbussessionservicedir=@dbussessionservicedir@
@ -35,6 +39,7 @@ pkgsysconfdir=$(sysconfdir)/systemd
userunitdir=$(prefix)/lib/systemd/user
tmpfilesdir=$(prefix)/lib/tmpfiles.d
usergeneratordir=$(pkglibexecdir)/user-generators
pkgincludedir=$(includedir)/systemd
# And these are the special ones for /
rootdir=@rootdir@
@ -183,6 +188,12 @@ systemgenerator_PROGRAMS += \
systemd-cryptsetup-generator
endif
lib_LTLIBRARIES = \
libsystemd-login.la
pkginclude_HEADERS = \
src/sd-login.h
noinst_PROGRAMS = \
test-engine \
test-job-type \
@ -192,7 +203,8 @@ noinst_PROGRAMS = \
test-daemon \
test-cgroup \
test-env-replace \
test-strv
test-strv \
test-login
if HAVE_PAM
pamlib_LTLIBRARIES = \
@ -410,6 +422,7 @@ EXTRA_DIST = \
units/quotacheck.service.in \
units/user@.service.in \
systemd.pc.in \
libsystemd-login.pc.in \
introspect.awk \
src/73-seat-late.rules.in
@ -472,7 +485,8 @@ dist_doc_DATA = \
src/sd-readahead.c
pkgconfigdata_DATA = \
systemd.pc
systemd.pc \
libsystemd-login.pc
# Passed through intltool only
polkitpolicy_in_files = \
@ -801,6 +815,16 @@ test_strv_CFLAGS = \
test_strv_LDADD = \
libsystemd-basic.la
test_login_SOURCES = \
src/test-login.c
test_login_CFLAGS = \
$(AM_CFLAGS)
test_login_LDADD = \
libsystemd-basic.la \
libsystemd-login.la
systemd_logger_SOURCES = \
src/logger.c \
src/tcpwrap.c
@ -946,6 +970,7 @@ systemd_uaccess_CFLAGS = \
systemd_uaccess_LDADD = \
libsystemd-basic.la \
libsystemd-daemon.la \
$(UDEV_LIBS) \
$(ACL_LIBS)
@ -1339,6 +1364,21 @@ pam_systemd_la_LIBADD = \
$(PAM_LIBS) \
$(DBUS_LIBS)
libsystemd_login_la_CFLAGS = \
$(AM_CFLAGS) \
-fvisibility=hidden
libsystemd_login_la_LDFLAGS = \
-shared \
-version-info $(LIBSYSTEMD_LOGIN_CURRENT):$(LIBSYSTEMD_LOGIN_REVISION):$(LIBSYSTEMD_LOGIN_AGE)
libsystemd_login_la_SOURCES = \
src/sd-login.c \
src/cgroup-util.c
libsystemd_login_la_LIBADD = \
libsystemd-basic.la
SED_PROCESS = \
$(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
$(SED) -e 's,@rootlibexecdir\@,$(rootlibexecdir),g' \
@ -1355,6 +1395,9 @@ SED_PROCESS = \
-e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g' \
-e 's,@PACKAGE_URL\@,$(PACKAGE_URL),g' \
-e 's,@prefix\@,$(prefix),g' \
-e 's,@exec_prefix\@,$(exec_prefix),g' \
-e 's,@libdir\@,$(libdir),g' \
-e 's,@includedir\@,$(includedir),g' \
< $< > $@ || rm $@
units/%: units/%.in Makefile

2
TODO
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@ -20,6 +20,8 @@ F15 External:
Features:
* logind: ensure ACLs are updated on login and logout
* warn if the user stops a service but not its associated socket
* ensure we always set the facility when logging to kmsg

18
libsystemd-login.pc.in Normal file
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@ -0,0 +1,18 @@
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@
Name: systemd
Description: systemd Login Utility Library
URL: @PACKAGE_URL@
Version: @PACKAGE_VERSION@
Libs: -L${libdir} -lsystemd-login
Cflags: -I${includedir}

323
src/sd-login.c Normal file
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@ -0,0 +1,323 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "util.h"
#include "cgroup-util.h"
#include "macro.h"
#include "sd-login.h"
_public_ int sd_pid_get_session(pid_t pid, char **session) {
int r;
char *cg_process, *cg_init, *p;
if (pid == 0)
pid = getpid();
if (pid <= 0)
return -EINVAL;
if (!session)
return -EINVAL;
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
if (r < 0)
return r;
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
if (r < 0) {
free(cg_process);
return r;
}
if (endswith(cg_init, "/system"))
cg_init[strlen(cg_init)-7] = 0;
else if (streq(cg_init, "/"))
cg_init[0] = 0;
if (startswith(cg_process, cg_init))
p = cg_process + strlen(cg_init);
else
p = cg_process;
free(cg_init);
if (!startswith(p, "/user/")) {
free(cg_process);
return -ENOENT;
}
p += 6;
if (startswith(p, "shared/") || streq(p, "shared")) {
free(cg_process);
return -ENOENT;
}
p = strchr(p, '/');
if (!p) {
free(cg_process);
return -ENOENT;
}
p++;
p = strndup(p, strcspn(p, "/"));
free(cg_process);
if (!p)
return -ENOMEM;
*session = p;
return 0;
}
_public_ int sd_uid_get_state(uid_t uid, char**state) {
char *p, *s = NULL;
int r;
if (!state)
return -EINVAL;
if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
free(p);
if (r == -ENOENT) {
free(s);
s = strdup("offline");
if (!s)
return -ENOMEM;
*state = s;
return 0;
} else if (r < 0) {
free(s);
return r;
} else if (!s)
return -EIO;
*state = s;
return 0;
}
static int uid_is_on_seat_internal(uid_t uid, const char *seat, const char *variable) {
char *p, *w, *t, *state, *s = NULL;
size_t l;
int r;
if (!seat)
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "UIDS", &s, NULL);
free(p);
if (r < 0) {
free(s);
return r;
}
if (!s)
return -EIO;
if (asprintf(&t, "%lu", (unsigned long) uid) < 0) {
free(s);
return -ENOMEM;
}
FOREACH_WORD(w, l, s, state) {
if (strncmp(t, w, l) == 0) {
free(s);
free(t);
return 1;
}
}
free(s);
free(t);
return 0;
}
_public_ int sd_uid_is_on_seat(uid_t uid, const char *seat) {
return uid_is_on_seat_internal(uid, seat, "UIDS");
}
_public_ int sd_uid_is_active_on_seat(uid_t uid, const char *seat) {
return uid_is_on_seat_internal(uid, seat, "ACTIVE_UID");
}
_public_ int sd_session_is_active(const char *session) {
int r;
char *p, *s = NULL;
if (!session)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
free(p);
if (r < 0) {
free(s);
return r;
}
if (!s)
return -EIO;
r = parse_boolean(s);
free(s);
return r;
}
_public_ int sd_session_get_uid(const char *session, uid_t *uid) {
int r;
char *p, *s = NULL;
unsigned long ul;
if (!session)
return -EINVAL;
if (!uid)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
free(p);
if (r < 0) {
free(s);
return r;
}
if (!s)
return -EIO;
r = safe_atolu(s, &ul);
free(s);
if (r < 0)
return r;
*uid = (uid_t) ul;
return 0;
}
_public_ int sd_session_get_seat(const char *session, char **seat) {
char *p, *s = NULL;
int r;
if (!session)
return -EINVAL;
if (!seat)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "SEAT", &s, NULL);
free(p);
if (r < 0) {
free(s);
return r;
}
if (isempty(s))
return -ENOENT;
*seat = s;
return 0;
}
_public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
char *p, *s = NULL, *t = NULL;
int r;
if (!seat)
return -EINVAL;
if (!session && !uid)
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
if (!p)
return -ENOMEM;
r = parse_env_file(p, NEWLINE,
"ACTIVE", &s,
"ACTIVE_UID", &t,
NULL);
free(p);
if (r < 0) {
free(s);
free(t);
return r;
}
if (session && !s) {
free(t);
return -EIO;
}
if (uid && !t) {
free(s);
return -EIO;
}
if (uid && t) {
unsigned long ul;
r = safe_atolu(t, &ul);
if (r < 0) {
free(t);
free(s);
return r;
}
*uid = (uid_t) ul;
}
free(t);
if (session && s)
*session = s;
else
free(s);
return 0;
}

51
src/sd-login.h Normal file
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@ -0,0 +1,51 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#ifndef foosdloginhfoo
#define foosdloginhfoo
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/types.h>
/* Get session from PID */
int sd_pid_get_session(pid_t pid, char **session);
/* Get state from uid. Possible states: offline, lingering, online, active */
int sd_uid_get_state(uid_t uid, char**state);
/* Return 1 if uid has session on seat */
int sd_uid_is_on_seat(uid_t uid, const char *seat);
/* Return 1 if uid has active session on seat */
int sd_uid_is_active_on_seat(uid_t uid, const char *seat);
/* Return 1 if the session is a active */
int sd_session_is_active(const char *session);
/* Determine user id of session */
int sd_session_get_uid(const char *session, uid_t *uid);
/* Determine seat of session */
int sd_session_get_seat(const char *session, char **seat);
/* Return active session and user of seat */
int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
#endif

65
src/test-login.c Normal file
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@ -0,0 +1,65 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "sd-login.h"
#include "util.h"
int main(int argc, char* argv[]) {
int r, k;
uid_t u, u2;
char *seat;
char *session;
char *state;
char *session2;
assert_se(sd_pid_get_session(0, &session) == 0);
printf("session = %s\n", session);
r = sd_session_is_active(session);
assert_se(r >= 0);
printf("active = %s\n", yes_no(r));
assert_se(sd_session_get_uid(session, &u) >= 0);
printf("uid = %lu\n", (unsigned long) u);
assert_se(sd_session_get_seat(session, &seat) >= 0);
printf("seat = %s\n", seat);
assert_se(sd_uid_get_state(u, &state) >= 0);
printf("state = %s\n", state);
assert_se(sd_uid_is_on_seat(u, seat) > 0);
k = sd_uid_is_active_on_seat(u, seat);
assert_se(k >= 0);
assert_se(!!r == !!r);
assert_se(sd_seat_get_active(seat, &session2, &u2) >= 0);
printf("session2 = %s\n", session2);
printf("uid2 = %lu\n", (unsigned long) u2);
free(session);
free(state);
free(session2);
free(seat);
return 0;
}

2
systemd.pc.in
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@ -6,7 +6,7 @@
# (at your option) any later version.
prefix=@prefix@
exec_prefix=${prefix}
exec_prefix=@exec_prefix@
systemdsystemunitdir=@systemunitdir@
systemduserunitdir=@userunitdir@
systemdsystemconfdir=@pkgsysconfdir@/system