/*
    Authors:
        Jan Cholasta <jcholast@redhat.com>

    Copyright (C) 2012 Red Hat

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include <popt.h>

#include "util/util.h"
#include "confdb/confdb.h"
#include "monitor/monitor_interfaces.h"
#include "responder/common/responder.h"
#include "responder/common/responder_sbus.h"
#include "responder/ssh/sshsrv_private.h"
#include "providers/data_provider.h"

struct mon_cli_iface monitor_ssh_methods = {
    { &mon_cli_iface_meta, 0 },
    .ping = monitor_common_pong,
    .resInit = monitor_common_res_init,
    .shutDown = NULL,
    .goOffline = NULL,
    .resetOffline = NULL,
    .rotateLogs = responder_logrotate,
    .clearMemcache = NULL,
    .clearEnumCache = NULL,
    .sysbusReconnect = NULL,
};

static struct data_provider_iface ssh_dp_methods = {
    { &data_provider_iface_meta, 0 },
    .RegisterService = NULL,
    .pamHandler = NULL,
    .sudoHandler = NULL,
    .autofsHandler = NULL,
    .hostHandler = NULL,
    .getDomains = NULL,
    .getAccountInfo = NULL,
};

static void ssh_dp_reconnect_init(struct sbus_connection *conn,
                                  int status, void *pvt)
{
    struct be_conn *be_conn = talloc_get_type(pvt, struct be_conn);
    int ret;

    /* Did we reconnect successfully? */
    if (status == SBUS_RECONNECT_SUCCESS) {
        DEBUG(SSSDBG_TRACE_FUNC, "Reconnected to the Data Provider.\n");

        /* Identify ourselves to the data provider */
        ret = dp_common_send_id(be_conn->conn,
                                DATA_PROVIDER_VERSION,
                                "SSH");
        /* all fine */
        if (ret == EOK) {
            handle_requests_after_reconnect(be_conn->rctx);
            return;
        }
    }

    /* Failed to reconnect */
    DEBUG(SSSDBG_FATAL_FAILURE, "Could not reconnect to %s provider.\n",
                                 be_conn->domain->name);
}

int ssh_process_init(TALLOC_CTX *mem_ctx,
                     struct tevent_context *ev,
                     struct confdb_ctx *cdb)
{
    struct resp_ctx *rctx;
    struct sss_cmd_table *ssh_cmds;
    struct ssh_ctx *ssh_ctx;
    struct be_conn *iter;
    int ret;
    int max_retries;

    ssh_cmds = get_ssh_cmds();
    ret = sss_process_init(mem_ctx, ev, cdb,
                           ssh_cmds,
                           SSS_SSH_SOCKET_NAME, -1, NULL, -1,
                           CONFDB_SSH_CONF_ENTRY,
                           SSS_SSH_SBUS_SERVICE_NAME,
                           SSS_SSH_SBUS_SERVICE_VERSION,
                           &monitor_ssh_methods,
                           "SSH",
                           &ssh_dp_methods.vtable,
                           &rctx);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "sss_process_init() failed\n");
        return ret;
    }

    ssh_ctx = talloc_zero(rctx, struct ssh_ctx);
    if (!ssh_ctx) {
        DEBUG(SSSDBG_FATAL_FAILURE, "fatal error initializing ssh_ctx\n");
        ret = ENOMEM;
        goto fail;
    }

    ssh_ctx->rctx = rctx;
    ssh_ctx->rctx->pvt_ctx = ssh_ctx;

    ret = sss_names_init_from_args(ssh_ctx,
                                   "(?P<name>[^@]+)@?(?P<domain>[^@]*$)",
                                   "%1$s@%2$s", &ssh_ctx->snctx);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "fatal error initializing regex data\n");
        goto fail;
    }

    /* Enable automatic reconnection to the Data Provider */
    ret = confdb_get_int(ssh_ctx->rctx->cdb,
                         CONFDB_SSH_CONF_ENTRY,
                         CONFDB_SERVICE_RECON_RETRIES,
                         3, &max_retries);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE,
              "Failed to set up automatic reconnection\n");
        goto fail;
    }

    for (iter = ssh_ctx->rctx->be_conns; iter; iter = iter->next) {
        sbus_reconnect_init(iter->conn, max_retries,
                            ssh_dp_reconnect_init, iter);
    }

    /* Get responder options */

    /* Get ssh_hash_known_hosts option */
    ret = confdb_get_bool(ssh_ctx->rctx->cdb,
                          CONFDB_SSH_CONF_ENTRY, CONFDB_SSH_HASH_KNOWN_HOSTS,
                          CONFDB_DEFAULT_SSH_HASH_KNOWN_HOSTS,
                          &ssh_ctx->hash_known_hosts);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "Error reading from confdb (%d) [%s]\n",
              ret, strerror(ret));
        goto fail;
    }

    /* Get ssh_known_hosts_timeout option */
    ret = confdb_get_int(ssh_ctx->rctx->cdb,
                         CONFDB_SSH_CONF_ENTRY, CONFDB_SSH_KNOWN_HOSTS_TIMEOUT,
                         CONFDB_DEFAULT_SSH_KNOWN_HOSTS_TIMEOUT,
                         &ssh_ctx->known_hosts_timeout);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "Error reading from confdb (%d) [%s]\n",
              ret, strerror(ret));
        goto fail;
    }

    ret = confdb_get_string(ssh_ctx->rctx->cdb, ssh_ctx,
                            CONFDB_SSH_CONF_ENTRY, CONFDB_SSH_CA_DB,
                            CONFDB_DEFAULT_SSH_CA_DB, &ssh_ctx->ca_db);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "Error reading CA DB from confdb (%d) [%s]\n",
              ret, strerror(ret));
        goto fail;
    }

    ret = schedule_get_domains_task(rctx, rctx->ev, rctx, NULL);
    if (ret != EOK) {
        DEBUG(SSSDBG_FATAL_FAILURE, "schedule_get_domains_tasks failed.\n");
        goto fail;
    }

    DEBUG(SSSDBG_TRACE_FUNC, "SSH Initialization complete\n");

    return EOK;

fail:
    talloc_free(rctx);
    return ret;
}

int main(int argc, const char *argv[])
{
    int opt;
    poptContext pc;
    struct main_context *main_ctx;
    int ret;
    uid_t uid;
    gid_t gid;

    struct poptOption long_options[] = {
        POPT_AUTOHELP
        SSSD_MAIN_OPTS
        SSSD_SERVER_OPTS(uid, gid)
        POPT_TABLEEND
    };

    /* Set debug level to invalid value so we can deside if -d 0 was used. */
    debug_level = SSSDBG_INVALID;

    umask(DFL_RSP_UMASK);

    pc = poptGetContext(argv[0], argc, argv, long_options, 0);
    while((opt = poptGetNextOpt(pc)) != -1) {
        switch(opt) {
        default:
            fprintf(stderr, "\nInvalid option %s: %s\n\n",
                  poptBadOption(pc, 0), poptStrerror(opt));
            poptPrintUsage(pc, stderr, 0);
            return 1;
        }
    }

    poptFreeContext(pc);

    DEBUG_INIT(debug_level);

    /* set up things like debug, signals, daemonization, etc... */
    debug_log_file = "sssd_ssh";

    ret = server_setup("sssd[ssh]", 0, uid, gid,
                       CONFDB_SSH_CONF_ENTRY, &main_ctx);
    if (ret != EOK) {
        return 2;
    }

    ret = die_if_parent_died();
    if (ret != EOK) {
        /* This is not fatal, don't return */
        DEBUG(SSSDBG_OP_FAILURE, "Could not set up to exit "
                                  "when parent process does\n");
    }

    ret = ssh_process_init(main_ctx,
                           main_ctx->event_ctx,
                           main_ctx->confdb_ctx);
    if (ret != EOK) {
        return 3;
    }

    /* loop on main */
    server_loop(main_ctx);

    return 0;
}
