core: set some event source priorities to enforce dispatching order

[thirdparty/systemd.git] / src / core / dbus-execute.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  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/>.
***/

#include <sys/prctl.h>

#include "bus-util.h"
#include "missing.h"
#include "ioprio.h"
#include "strv.h"
#include "syscall-list.h"
#include "fileio.h"
#include "execute.h"
#include "dbus-execute.h"

BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_exec_output, exec_output, ExecOutput);

static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_exec_input, exec_input, ExecInput);

static int property_get_environment_files(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;
        char **j;
        int r;

        assert(bus);
        assert(reply);
        assert(c);

        r = sd_bus_message_open_container(reply, 'a', "(sb)");
        if (r < 0)
                return r;

        STRV_FOREACH(j, c->environment_files) {
                const char *fn = *j;

                r = sd_bus_message_append(reply, "(sb)", fn[0] == '-' ? fn + 1 : fn, fn[0] == '-');
                if (r < 0)
                        return r;
        }

        return sd_bus_message_close_container(reply);
}

static int property_get_rlimit(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        struct rlimit *rl;
        uint64_t u;

        assert(bus);
        assert(reply);
        assert(userdata);

        rl = *(struct rlimit**) userdata;
        if (rl)
                u = (uint64_t) rl->rlim_max;
        else {
                struct rlimit buf = {};
                int z;

                z = rlimit_from_string(property);
                assert(z >= 0);

                getrlimit(z, &buf);

                u = (uint64_t) buf.rlim_max;
        }

        return sd_bus_message_append(reply, "t", u);
}

static int property_get_oom_score_adjust(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {


        ExecContext *c = userdata;
        int32_t n;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->oom_score_adjust_set)
                n = c->oom_score_adjust;
        else {
                _cleanup_free_ char *t = NULL;

                n = 0;
                if (read_one_line_file("/proc/self/oom_score_adj", &t) >= 0)
                        safe_atoi(t, &n);
        }

        return sd_bus_message_append(reply, "i", n);
}

static int property_get_nice(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {


        ExecContext *c = userdata;
        int32_t n;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->nice_set)
                n = c->nice;
        else {
                errno = 0;
                n = getpriority(PRIO_PROCESS, 0);
                if (errno != 0)
                        n = 0;
        }

        return sd_bus_message_append(reply, "i", n);
}

static int property_get_ioprio(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {


        ExecContext *c = userdata;
        int32_t n;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->ioprio_set)
                n = c->ioprio;
        else {
                n = ioprio_get(IOPRIO_WHO_PROCESS, 0);
                if (n < 0)
                        n = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 4);
        }

        return sd_bus_message_append(reply, "i", n);
}

static int property_get_cpu_sched_policy(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;
        int32_t n;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->cpu_sched_set)
                n = c->cpu_sched_policy;
        else {
                n = sched_getscheduler(0);
                if (n < 0)
                        n = SCHED_OTHER;
        }

        return sd_bus_message_append(reply, "i", n);
}

static int property_get_cpu_sched_priority(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;
        int32_t n;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->cpu_sched_set)
                n = c->cpu_sched_priority;
        else {
                struct sched_param p = {};

                if (sched_getparam(0, &p) >= 0)
                        n = p.sched_priority;
                else
                        n = 0;
        }

        return sd_bus_message_append(reply, "i", n);
}

static int property_get_cpu_affinity(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->cpuset)
                return sd_bus_message_append_array(reply, 'y', c->cpuset, CPU_ALLOC_SIZE(c->cpuset_ncpus));
        else
                return sd_bus_message_append_array(reply, 'y', NULL, 0);
}

static int property_get_timer_slack_nsec(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;
        uint64_t u;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->timer_slack_nsec != (nsec_t) -1)
                u = (uint64_t) c->timer_slack_nsec;
        else
                u = (uint64_t) prctl(PR_GET_TIMERSLACK);

        return sd_bus_message_append(reply, "t", u);
}

static int property_get_capability_bounding_set(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;

        assert(bus);
        assert(reply);
        assert(c);

        /* We store this negated internally, to match the kernel, but
         * we expose it normalized. */
        return sd_bus_message_append(reply, "t", ~c->capability_bounding_set_drop);
}

static int property_get_capabilities(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;
        char *t = NULL;
        const char *s;
        int r;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->capabilities)
                s = t = cap_to_text(c->capabilities, NULL);
        else
                s = "";

        if (!s)
                return -ENOMEM;

        r = sd_bus_message_append(reply, "s", s);

        if (t)
                cap_free(t);

        return r;
}

static int property_get_syscall_filter(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        ExecContext *c = userdata;

        assert(bus);
        assert(reply);
        assert(c);

        if (c->syscall_filter)
                return sd_bus_message_append_array(reply, 'u', c->syscall_filter, (syscall_max() + 31) >> 4);
        else
                return sd_bus_message_append_array(reply, 'u', NULL, 0);
}

const sd_bus_vtable bus_exec_vtable[] = {
        SD_BUS_VTABLE_START(0),
        SD_BUS_PROPERTY("Environment", "as", NULL, offsetof(ExecContext, environment), 0),
        SD_BUS_PROPERTY("EnvironmentFiles", "a(sb)", property_get_environment_files, 0, 0),
        SD_BUS_PROPERTY("UMask", "u", bus_property_get_mode, offsetof(ExecContext, umask), 0),
        SD_BUS_PROPERTY("LimitCPU", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_CPU]), 0),
        SD_BUS_PROPERTY("LimitFSIZE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_FSIZE]), 0),
        SD_BUS_PROPERTY("LimitDATA", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_DATA]), 0),
        SD_BUS_PROPERTY("LimitSTACK", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_STACK]), 0),
        SD_BUS_PROPERTY("LimitCORE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_CORE]), 0),
        SD_BUS_PROPERTY("LimitRSS", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_RSS]), 0),
        SD_BUS_PROPERTY("LimitNOFILE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_NOFILE]), 0),
        SD_BUS_PROPERTY("LimitAS", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_AS]), 0),
        SD_BUS_PROPERTY("LimitNPROC", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_NPROC]), 0),
        SD_BUS_PROPERTY("LimitMEMLOCK", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_MEMLOCK]), 0),
        SD_BUS_PROPERTY("LimitLOCKS", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_LOCKS]), 0),
        SD_BUS_PROPERTY("LimitSIGPENDING", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_SIGPENDING]), 0),
        SD_BUS_PROPERTY("LimitMSGQUEUE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_MSGQUEUE]), 0),
        SD_BUS_PROPERTY("LimitNICE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_NICE]), 0),
        SD_BUS_PROPERTY("LimitRTPRIO", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_RTPRIO]), 0),
        SD_BUS_PROPERTY("LimitRTTIME", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_RTTIME]), 0),
        SD_BUS_PROPERTY("WorkingDirectory", "s", NULL, offsetof(ExecContext, working_directory), 0),
        SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(ExecContext, root_directory), 0),
        SD_BUS_PROPERTY("OOMScoreAdjust", "i", property_get_oom_score_adjust, 0, 0),
        SD_BUS_PROPERTY("Nice", "i", property_get_nice, 0, 0),
        SD_BUS_PROPERTY("IOScheduling", "i", property_get_ioprio, 0, 0),
        SD_BUS_PROPERTY("CPUSchedulingPolicy", "i", property_get_cpu_sched_policy, 0, 0),
        SD_BUS_PROPERTY("CPUSchedulingPriority", "i", property_get_cpu_sched_priority, 0, 0),
        SD_BUS_PROPERTY("CPUAffinity", "ay", property_get_cpu_affinity, 0, 0),
        SD_BUS_PROPERTY("TimerSlackNSec", "t", property_get_timer_slack_nsec, 0, 0),
        SD_BUS_PROPERTY("CPUSchedulingResetOnFork", "b", bus_property_get_bool, offsetof(ExecContext, cpu_sched_reset_on_fork), 0),
        SD_BUS_PROPERTY("NonBlocking", "b", bus_property_get_bool, offsetof(ExecContext, non_blocking), 0),
        SD_BUS_PROPERTY("StandardInput", "s", property_get_exec_input, offsetof(ExecContext, std_input), 0),
        SD_BUS_PROPERTY("StandardOutput", "s", bus_property_get_exec_output, offsetof(ExecContext, std_output), 0),
        SD_BUS_PROPERTY("StandardError", "s", bus_property_get_exec_output, offsetof(ExecContext, std_error), 0),
        SD_BUS_PROPERTY("TTYPath", "s", NULL, offsetof(ExecContext, tty_path), 0),
        SD_BUS_PROPERTY("TTYReset", "b", bus_property_get_bool, offsetof(ExecContext, tty_reset), 0),
        SD_BUS_PROPERTY("TTYVHangup", "b", bus_property_get_bool, offsetof(ExecContext, tty_vhangup), 0),
        SD_BUS_PROPERTY("TTYVTDisallocate", "b", bus_property_get_bool, offsetof(ExecContext, tty_vt_disallocate), 0),
        SD_BUS_PROPERTY("SyslogPriority", "i", bus_property_get_int, offsetof(ExecContext, syslog_priority), 0),
        SD_BUS_PROPERTY("SyslogIdentifier", "s", NULL, offsetof(ExecContext, syslog_identifier), 0),
        SD_BUS_PROPERTY("SyslogLevelPrefix", "b", bus_property_get_bool, offsetof(ExecContext, syslog_level_prefix), 0),
        SD_BUS_PROPERTY("Capabilities", "s", property_get_capabilities, 0, 0),
        SD_BUS_PROPERTY("SecureBits", "i", bus_property_get_int, offsetof(ExecContext, secure_bits), 0),
        SD_BUS_PROPERTY("CapabilityBoundingSet", "t", property_get_capability_bounding_set, 0, 0),
        SD_BUS_PROPERTY("User", "s", NULL, offsetof(ExecContext, user), 0),
        SD_BUS_PROPERTY("Group", "s", NULL, offsetof(ExecContext, group), 0),
        SD_BUS_PROPERTY("SupplementaryGroups", "as", NULL, offsetof(ExecContext, supplementary_groups), 0),
        SD_BUS_PROPERTY("TCPWrapName", "s", NULL, offsetof(ExecContext, tcpwrap_name), 0),
        SD_BUS_PROPERTY("PAMName", "s", NULL, offsetof(ExecContext, pam_name), 0),
        SD_BUS_PROPERTY("ReadWriteDirectories", "as", NULL, offsetof(ExecContext, read_write_dirs), 0),
        SD_BUS_PROPERTY("ReadOnlyDirectories", "as", NULL, offsetof(ExecContext, read_only_dirs), 0),
        SD_BUS_PROPERTY("InaccessibleDirectories", "as", NULL, offsetof(ExecContext, inaccessible_dirs), 0),
        SD_BUS_PROPERTY("MountFlags", "t", bus_property_get_ulong, offsetof(ExecContext, mount_flags), 0),
        SD_BUS_PROPERTY("PrivateTmp", "b", bus_property_get_bool, offsetof(ExecContext, private_tmp), 0),
        SD_BUS_PROPERTY("PrivateNetwork", "b", bus_property_get_bool, offsetof(ExecContext, private_network), 0),
        SD_BUS_PROPERTY("SameProcessGroup", "b", bus_property_get_bool, offsetof(ExecContext, same_pgrp), 0),
        SD_BUS_PROPERTY("UtmpIdentifier", "s", NULL, offsetof(ExecContext, utmp_id), 0),
        SD_BUS_PROPERTY("IgnoreSIGPIPE", "b", bus_property_get_bool, offsetof(ExecContext, ignore_sigpipe), 0),
        SD_BUS_PROPERTY("NoNewPrivileges", "b", bus_property_get_bool, offsetof(ExecContext, no_new_privileges), 0),
        SD_BUS_PROPERTY("SystemCallFilter", "au", property_get_syscall_filter, 0, 0),
        SD_BUS_VTABLE_END
};

int bus_property_get_exec_command(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *ret_error) {

        ExecCommand *c = *(ExecCommand**) userdata;
        int r;

        assert(bus);
        assert(reply);

        r = sd_bus_message_open_container(reply, 'a', "(sasbttttuii)");
        if (r < 0)
                return r;

        LIST_FOREACH(command, c, c) {
                if (!c->path)
                        continue;

                r = sd_bus_message_open_container(reply, 'r', "sasbttttuii");
                if (r < 0)
                        return r;

                r = sd_bus_message_append(reply, "s", c->path);
                if (r < 0)
                        return r;

                r = sd_bus_message_append_strv(reply, c->argv);
                if (r < 0)
                        return r;

                r = sd_bus_message_append(reply, "bttttuii",
                                          c->ignore,
                                          c->exec_status.start_timestamp.realtime,
                                          c->exec_status.start_timestamp.monotonic,
                                          c->exec_status.exit_timestamp.realtime,
                                          c->exec_status.exit_timestamp.monotonic,
                                          (uint32_t) c->exec_status.pid,
                                          (int32_t) c->exec_status.code,
                                          (int32_t) c->exec_status.status);
                if (r < 0)
                        return r;

                r = sd_bus_message_close_container(reply);
                if (r < 0)
                        return r;
        }

        return sd_bus_message_close_container(reply);
}