Merge illumos-gate

[unleashed.git] / usr / src / cmd / rmvolmgr / rmvolmgr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * rmvolmgr daemon
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <strings.h>
#include <errno.h>
#include <libintl.h>
#include <sys/syscall.h>
#include <libscf.h>
#include <priv_utils.h>

#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>
#include <libhal.h>

#include "rmm_common.h"

char *progname = "rmvolmgr";

#define RMVOLMGR_FMRI   "svc:/system/filesystem/rmvolmgr:default"

typedef struct managed_volume {
        char                    *udi;
        boolean_t               my;
        struct action_arg       aa;
} managed_volume_t;

static GSList           *managed_volumes;

static GMainLoop        *mainloop;
static LibHalContext    *hal_ctx;
static int              sigexit_pipe[2];
static GIOChannel       *sigexit_ioch;

static boolean_t        opt_c;  /* disable CDE compatibility */
static boolean_t        opt_n;  /* disable legacy mountpoint symlinks */
static boolean_t        opt_s;  /* system instance */

/* SMF property "eject_button" */
static boolean_t        rmm_prop_eject_button = B_TRUE;

static void     get_smf_properties();
static void     rmm_device_added(LibHalContext *ctx, const char *udi);
static void     rmm_device_removed(LibHalContext *ctx, const char *udi);
static void     rmm_property_modified(LibHalContext *ctx, const char *udi,
                const char *key, dbus_bool_t is_removed, dbus_bool_t is_added);
static void     rmm_device_condition(LibHalContext *ctx, const char *udi,
                const char *name, const char *detail);
static void     rmm_mount_all();
static void     rmm_unmount_all();
static void     sigexit(int signo);
static gboolean sigexit_ioch_func(GIOChannel *source, GIOCondition condition,
                gpointer user_data);

static void
usage()
{
        (void) fprintf(stderr, gettext("\nusage: rmvolmgr [-v]\n"));
}

static int
rmvolmgr(int argc, char **argv)
{
        const char      *opts = "chnsv";
        DBusError       error;
        boolean_t       daemonize;
        rmm_error_t     rmm_error;
        int             c;

        while ((c = getopt(argc, argv, opts)) != EOF) {
                switch (c) {
                case 'c':
                        opt_c = B_TRUE;
                        break;
                case 'n':
                        opt_n = B_TRUE;
                        break;
                case 's':
                        opt_s = B_TRUE;
                        break;
                case 'v':
                        rmm_debug = 1;
                        break;
                case '?':
                case 'h':
                        usage();
                        return (0);
                default:
                        usage();
                        return (1);
                }
        }

        if (opt_s) {
                if (geteuid() != 0) {
                        (void) fprintf(stderr,
                            gettext("system instance must have euid 0\n"));
                        return (1);
                }

                get_smf_properties();

                if (opt_c) {
                        rmm_vold_actions_enabled = B_FALSE;
                }
                if (opt_n) {
                        rmm_vold_mountpoints_enabled = B_FALSE;
                }


                /*
                 * Drop unused privileges. Remain root for HAL interaction
                 * and to create legacy symlinks.
                 *
                 * Need PRIV_FILE_DAC_WRITE to write to users'
                 * /tmp/.removable/notify* files.
                 */
                if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET,
                    0, 0,
                    rmm_vold_actions_enabled ? PRIV_FILE_DAC_WRITE : NULL,
                    NULL) == -1) {
                        (void) fprintf(stderr,
                            gettext("failed to drop privileges"));
                        return (1);
                }
                /* basic privileges we don't need */
                (void) priv_set(PRIV_OFF, PRIV_PERMITTED, PRIV_PROC_EXEC,
                    PRIV_PROC_INFO, PRIV_FILE_LINK_ANY, PRIV_PROC_SESSION,
                    NULL);

        } else {
                if (opt_c) {
                        rmm_vold_actions_enabled = B_FALSE;
                }
                if (opt_n) {
                        rmm_vold_mountpoints_enabled = B_FALSE;
                }
        }

        daemonize = (getenv("RMVOLMGR_NODAEMON") == NULL);

        if (daemonize && daemon(0, 0) < 0) {
                dprintf("daemonizing failed: %s", strerror(errno));
                return (1);
        }

        if (opt_s) {
                __fini_daemon_priv(PRIV_PROC_FORK, NULL);
        }

        /*
         * signal mainloop integration using pipes
         */
        if (pipe(sigexit_pipe) != 0) {
                dprintf("pipe failed %s\n", strerror(errno));
                return (1);
        }
        sigexit_ioch = g_io_channel_unix_new(sigexit_pipe[0]);
        if (sigexit_ioch == NULL) {
                dprintf("g_io_channel_unix_new failed\n");
                return (1);
        }
        g_io_add_watch(sigexit_ioch, G_IO_IN, sigexit_ioch_func, NULL);
        signal(SIGTERM, sigexit);
        signal(SIGINT, sigexit);
        signal(SIGHUP, SIG_IGN);
        signal(SIGUSR1, SIG_IGN);
        signal(SIGUSR2, SIG_IGN);

        if ((hal_ctx = rmm_hal_init(rmm_device_added, rmm_device_removed,
            rmm_property_modified, rmm_device_condition,
            &error, &rmm_error)) == NULL) {
                dbus_error_free(&error);
                return (1);
        }

        /* user instance should claim devices */
        if (!opt_s) {
                if (!rmm_hal_claim_branch(hal_ctx, HAL_BRANCH_LOCAL)) {
                        (void) fprintf(stderr,
                            gettext("cannot claim branch\n"));
                        return (1);
                }
        }

        rmm_mount_all();

        if ((mainloop = g_main_loop_new(NULL, B_FALSE)) == NULL) {
                dprintf("Cannot create main loop\n");
                return (1);
        }

        g_main_loop_run(mainloop);

        return (0);
}

static void
get_smf_properties()
{
        scf_simple_prop_t *prop;
        uint8_t *val;

        if ((prop = scf_simple_prop_get(NULL, RMVOLMGR_FMRI,
            "rmvolmgr", "legacy_mountpoints")) != NULL) {
                if ((val = scf_simple_prop_next_boolean(prop)) != NULL) {
                        rmm_vold_mountpoints_enabled = (*val != 0);
                }
                scf_simple_prop_free(prop);
        }

        if ((prop = scf_simple_prop_get(NULL, RMVOLMGR_FMRI,
            "rmvolmgr", "cde_compatible")) != NULL) {
                if ((val = scf_simple_prop_next_boolean(prop)) != NULL) {
                        rmm_vold_actions_enabled = (*val != 0);
                }
                scf_simple_prop_free(prop);
        }

        if ((prop = scf_simple_prop_get(NULL, RMVOLMGR_FMRI,
            "rmvolmgr", "eject_button")) != NULL) {
                if ((val = scf_simple_prop_next_boolean(prop)) != NULL) {
                        rmm_prop_eject_button = (*val != 0);
                }
                scf_simple_prop_free(prop);
        }
}

/* ARGSUSED */
static void
sigexit(int signo)
{
        dprintf("signal to exit %d\n", signo);

        write(sigexit_pipe[1], "s", 1);
}

/* ARGSUSED */
static gboolean
sigexit_ioch_func(GIOChannel *source, GIOCondition condition,
    gpointer user_data)
{
        gchar   buf[1];
        gsize   bytes_read;
        GError  *error = NULL;

        if (g_io_channel_read_chars(source, buf, 1, &bytes_read, &error) !=
            G_IO_STATUS_NORMAL) {
                dprintf("g_io_channel_read_chars failed %s", error->message);
                g_error_free(error);
                return (TRUE);
        }

        dprintf("signal to exit\n");

        rmm_unmount_all();

        g_main_loop_quit(mainloop);

        return (TRUE);
}

static managed_volume_t *
rmm_managed_alloc(LibHalContext *ctx, const char *udi)
{
        managed_volume_t *v;

        if ((v = calloc(1, sizeof (managed_volume_t))) == NULL) {
                return (NULL);
        }
        if ((v->udi = strdup(udi)) == NULL) {
                free(v);
                return (NULL);
        }
        if (!rmm_volume_aa_from_prop(ctx, udi, NULL, &v->aa)) {
                free(v->udi);
                free(v);
                return (NULL);
        }

        return (v);
}

static void
rmm_managed_free(managed_volume_t *v)
{
        rmm_volume_aa_free(&v->aa);
        free(v->udi);
        free(v);
}

static gint
rmm_managed_compare_udi(gconstpointer a, gconstpointer b)
{
        const managed_volume_t *va = a;
        const char *udi = b;

        return (strcmp(va->udi, udi));
}

static boolean_t
volume_should_mount(const char *udi)
{
        char    *storage_device = NULL;
        int     ret = B_FALSE;

        if (libhal_device_get_property_bool(hal_ctx, udi,
            "volume.ignore", NULL)) {
                goto out;
        }

        /* get the backing storage device */
        if (!(storage_device = libhal_device_get_property_string(hal_ctx, udi,
            "block.storage_device", NULL))) {
                dprintf("cannot get block.storage_device\n");
                goto out;
        }

        /* we handle either removable or hotpluggable */
        if (!libhal_device_get_property_bool(hal_ctx, storage_device,
            "storage.removable", NULL) &&
            !libhal_device_get_property_bool(hal_ctx, storage_device,
            "storage.hotpluggable", NULL)) {
                goto out;
        }

        /* ignore if claimed by another volume manager */
        if (libhal_device_get_property_bool(hal_ctx, storage_device,
            "info.claimed", NULL)) {
                goto out;
        }

        ret = B_TRUE;

out:
        libhal_free_string(storage_device);
        return (ret);
}

static void
volume_added(const char *udi)
{
        GSList          *l;
        managed_volume_t *v;

        dprintf("volume added %s\n", udi);

        l = g_slist_find_custom(managed_volumes, udi, rmm_managed_compare_udi);
        v = (l != NULL) ? l->data : NULL;

        if (v != NULL) {
                dprintf("already managed %s\n", udi);
                return;
        }
        if (!volume_should_mount(udi)) {
                dprintf("should not mount %s\n", udi);
                return;
        }
        if ((v = rmm_managed_alloc(hal_ctx, udi)) == NULL) {
                return;
        }
        if (rmm_action(hal_ctx, udi, INSERT, &v->aa, 0, 0, 0)) {
                v->my = B_TRUE;
                managed_volumes = g_slist_prepend(managed_volumes, v);
        } else {
                dprintf("rmm_action failed %s\n", udi);
                rmm_managed_free(v);
        }
}

static void
volume_removed(const char *udi)
{
        GSList          *l;
        managed_volume_t *v;

        dprintf("volume removed %s\n", udi);

        l = g_slist_find_custom(managed_volumes, udi, rmm_managed_compare_udi);
        v = (l != NULL) ? l->data : NULL;
        if (v == NULL) {
                return;
        }

        /* HAL will unmount, just do the vold legacy stuff */
        v->aa.aa_action = EJECT;
        (void) vold_postprocess(hal_ctx, udi, &v->aa);

        rmm_managed_free(v);
        managed_volumes = g_slist_delete_link(managed_volumes, l);
}

/* ARGSUSED */
static void
rmm_device_added(LibHalContext *ctx, const char *udi)
{
        if (libhal_device_query_capability(hal_ctx, udi, "volume", NULL)) {
                volume_added(udi);
        }
}

/* ARGSUSED */
static void
rmm_device_removed(LibHalContext *ctx, const char *udi)
{
        if (libhal_device_query_capability(hal_ctx, udi, "volume", NULL)) {
                volume_removed(udi);
        }
}

/* ARGSUSED */
static void
rmm_property_modified(LibHalContext *ctx, const char *udi, const char *key,
    dbus_bool_t is_removed, dbus_bool_t is_added)
{
        DBusError               error;
        GSList                  *l;
        managed_volume_t        *v;
        boolean_t               is_mounted;

        if (strcmp(key, "volume.is_mounted") != 0) {
                return;
        }
        is_mounted = libhal_device_get_property_bool(hal_ctx, udi, key, NULL);

        l = g_slist_find_custom(managed_volumes, udi, rmm_managed_compare_udi);
        v = (l != NULL) ? l->data : NULL;

        if (is_mounted) {
                dprintf("Mounted: %s\n", udi);

                if (v != NULL) {
                        /* volume mounted by us is already taken care of */
                        if (v->my) {
                                return;
                        }
                } else {
                        if ((v = rmm_managed_alloc(ctx, udi)) == NULL) {
                                return;
                        }
                        managed_volumes = g_slist_prepend(managed_volumes, v);
                }

                v->aa.aa_action = INSERT;
                (void) vold_postprocess(hal_ctx, udi, &v->aa);

        } else {
                dprintf("Unmounted: %s\n", udi);

                if (v == NULL) {
                        return;
                }

                v->aa.aa_action = EJECT;
                (void) vold_postprocess(hal_ctx, udi, &v->aa);

                rmm_managed_free(v);
                managed_volumes = g_slist_delete_link(managed_volumes, l);
        }
}

static void
storage_eject_pressed(const char *udi)
{
        DBusError       error;

        /* ignore if disabled via SMF or claimed by another volume manager */
        if (!rmm_prop_eject_button ||
            libhal_device_get_property_bool(hal_ctx, udi, "info.claimed",
            NULL)) {
                return;
        }

        dbus_error_init(&error);
        (void) rmm_hal_eject(hal_ctx, udi, &error);
        rmm_dbus_error_free(&error);
}

/* ARGSUSED */
static void
rmm_device_condition(LibHalContext *ctx, const char *udi,
    const char *name, const char *detail)
{
        if ((strcmp(name, "EjectPressed") == 0) &&
            libhal_device_query_capability(hal_ctx, udi, "storage", NULL)) {
                storage_eject_pressed(udi);
        }
}

/*
 * Mount all mountable volumes
 */
static void
rmm_mount_all()
{
        DBusError       error;
        char            **udis = NULL;
        int             num_udis;
        int             i;
        managed_volume_t *v;

        dbus_error_init(&error);

        /* get all volumes */
        if ((udis = libhal_find_device_by_capability(hal_ctx, "volume",
            &num_udis, &error)) == NULL) {
                dprintf("mount_all: no volumes found\n");
                goto out;
        }

        for (i = 0; i < num_udis; i++) {
                /* skip if already mounted */
                if (libhal_device_get_property_bool(hal_ctx, udis[i],
                    "volume.is_mounted", NULL)) {
                        dprintf("mount_all: %s already mounted\n", udis[i]);
                        continue;
                }
                if (!volume_should_mount(udis[i])) {
                        continue;
                }
                if ((v = rmm_managed_alloc(hal_ctx, udis[i])) == NULL) {
                        continue;
                }
                if (rmm_action(hal_ctx, udis[i], INSERT, &v->aa, 0, 0, 0)) {
                        v->my = B_TRUE;
                        managed_volumes = g_slist_prepend(managed_volumes, v);
                } else {
                        rmm_managed_free(v);
                }
        }

out:
        if (udis != NULL) {
                libhal_free_string_array(udis);
        }
        rmm_dbus_error_free(&error);
}

/*
 * Mount all volumes mounted by this program
 */
static void
rmm_unmount_all()
{
        GSList          *i;
        managed_volume_t *v;

        for (i = managed_volumes; i != NULL; i = managed_volumes) {
                v = (managed_volume_t *)i->data;

                if (v->my && libhal_device_get_property_bool(hal_ctx, v->udi,
                    "volume.is_mounted", NULL)) {
                        (void) rmm_action(hal_ctx, v->udi, UNMOUNT,
                            &v->aa, 0, 0, 0);
                }

                managed_volumes = g_slist_remove(managed_volumes, v);
                rmm_managed_free(v);
        }
}

int
main(int argc, char **argv)
{
        return (rmvolmgr(argc, argv));
}