hal/hald-runner/main.c

/***************************************************************************
 * CVSID: $Id$
 *
 * main.c - Main dbus interface of the hald runner
 *
 * Copyright (C) 2006 Sjoerd Simons, <sjoerd@luon.net>
 *
 * Licensed under the Academic Free License version 2.1
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 **************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus-glib-lowlevel.h>

#include <glib.h>
#include "utils.h"
#include "runner.h"

static gboolean
parse_first_part(run_request *r, DBusMessage *msg, DBusMessageIter *iter)
{
    DBusMessageIter sub_iter;
    char *tmpstr;

    /* First should be the device UDI */
    if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_STRING)
        goto malformed;
    dbus_message_iter_get_basic(iter, &tmpstr);
    r->udi = g_strdup(tmpstr);

    /* Then the environment array */
    if (!dbus_message_iter_next(iter) || dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY)
        goto malformed;
    dbus_message_iter_recurse(iter, &sub_iter);
    /* Add default path for the programs we start */
    tmpstr = g_strdup_printf("PATH=/sbin:/usr/sbin:/bin:/usr/bin:%s", getenv("PATH"));
    r->environment = get_string_array(&sub_iter, tmpstr);

    /* Then argv */
    if (!dbus_message_iter_next(iter) || dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY)
        goto malformed;
    dbus_message_iter_recurse(iter, &sub_iter);
    r->argv = get_string_array(&sub_iter, NULL);

    return TRUE;

malformed:
    return FALSE;
}

static void
handle_run(DBusConnection *con, DBusMessage *msg)
{
    DBusMessage *reply;
    DBusMessageIter iter;
    run_request *r;
    char *tmpstr;

    r = new_run_request();
    g_assert(dbus_message_iter_init(msg, &iter));

    if (!parse_first_part(r, msg, &iter))
        goto malformed;

    /* Next a string of what should be written to stdin */
    if (!dbus_message_iter_next(&iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
        goto malformed;
    dbus_message_iter_get_basic(&iter, &tmpstr);
    r->input = g_strdup(tmpstr);

    /* Then an bool to indicate if we should grab stderr */
    if (!dbus_message_iter_next(&iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
        goto malformed;
    dbus_message_iter_get_basic(&iter, &(r->error_on_stderr));

    /* Then an uint32 timeout for it */
    if (!dbus_message_iter_next(&iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
        goto malformed;
    dbus_message_iter_get_basic(&iter, &(r->timeout));

    /* let run_request_run handle the reply */
    run_request_run(r, con, msg, NULL);
    return;

malformed:
    del_run_request(r);
    reply = dbus_message_new_error(msg, "org.freedesktop.HalRunner.Malformed",
                       "Malformed run request");
    dbus_connection_send(con, reply, NULL);
    dbus_message_unref(reply);
}

static void
handle_start(DBusConnection *con, DBusMessage *msg)
{
    DBusMessage *reply;
    DBusMessageIter iter;
    run_request *r;
    GPid pid;
    dbus_int64_t pid64;

    r = new_run_request();
    g_assert(dbus_message_iter_init(msg, &iter));

    if (!dbus_message_iter_init(msg, &iter) || !parse_first_part(r, msg, &iter))
        goto malformed;

    if (run_request_run(r, con, NULL, &pid)) {
        pid64 = pid;
        reply = dbus_message_new_method_return(msg);
        dbus_message_append_args (reply,
                      DBUS_TYPE_INT64, &pid64,
                      DBUS_TYPE_INVALID);

    } else {
        reply = dbus_message_new_error(msg, "org.freedesktop.HalRunner.Failed",
                           "Start request failed");
    }
    dbus_connection_send(con, reply, NULL);
    dbus_message_unref(reply);
    return ;
malformed:
    del_run_request(r);
    reply = dbus_message_new_error(msg, "org.freedesktop.HalRunner.Malformed",
                       "Malformed start request");
    dbus_connection_send(con, reply, NULL);
    dbus_message_unref(reply);
}

static void
handle_kill(DBusConnection *con, DBusMessage *msg)
{
    DBusError error;
    DBusMessage *reply = NULL;
    char *udi;

    dbus_error_init (&error);
    if (!dbus_message_get_args(msg, &error,
                   DBUS_TYPE_STRING, &udi,
                   DBUS_TYPE_INVALID)) {
        reply = dbus_message_new_error (msg, "org.freedesktop.HalRunner.Malformed",
                        "Malformed kill message");
        g_assert(reply);
        dbus_connection_send (con, reply, NULL);
        dbus_message_unref(reply);
        return;
    }
    run_kill_udi(udi);

    /* always successfull */
    reply = dbus_message_new_method_return(msg);
    dbus_connection_send(con, reply, NULL);
    dbus_message_unref(reply);
}

static DBusHandlerResult
filter(DBusConnection *con, DBusMessage *msg, void *user_data)
{
    DBusMessage *reply;

    if (dbus_message_is_method_call(msg, "org.freedesktop.HalRunner", "Run")) {
        handle_run(con, msg);
        return DBUS_HANDLER_RESULT_HANDLED;
    } else if (dbus_message_is_method_call(msg, "org.freedesktop.HalRunner", "Start")) {
        handle_start(con, msg);
        return DBUS_HANDLER_RESULT_HANDLED;
    } else if (dbus_message_is_method_call(msg, "org.freedesktop.HalRunner", "Kill")) {
        handle_kill(con, msg);
        return DBUS_HANDLER_RESULT_HANDLED;
    } else if (dbus_message_is_method_call(msg, "org.freedesktop.HalRunner", "KillAll")) {
        run_kill_all();
        /* alwasy successfull */
        reply = dbus_message_new_method_return(msg);
        dbus_connection_send(con, reply, NULL);
        dbus_message_unref(reply);
        return DBUS_HANDLER_RESULT_HANDLED;
    }
    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

int
main(int argc, char **argv)
{
    DBusConnection *c;
    DBusError error;
    GMainLoop *loop;
    char *dbus_address;

    run_init();
    dbus_error_init(&error);
    dbus_address = getenv("HALD_RUNNER_DBUS_ADDRESS");
    g_assert(dbus_address != NULL);

    fprintf(stderr, "Runner started - allowed paths are '%s'\n", getenv("PATH"));

    c = dbus_connection_open(dbus_address, &error);
    if (c == NULL)
        goto error;

    loop = g_main_loop_new(NULL, FALSE);

    dbus_connection_setup_with_g_main(c, NULL);
    dbus_connection_set_exit_on_disconnect(c, TRUE);
    dbus_connection_add_filter(c, filter, NULL, NULL);

    g_main_loop_run(loop);

error:
    fprintf(stderr,"An error has occured: %s\n", error.message);
    return -1;
}