drm-lease-manager/main.c

   1 /* Copyright 2020-2021 IGEL Co., Ltd.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include "config.h"
  17 #include "lease-config.h"
  18 #include "lease-manager.h"
  19 #include "lease-server.h"
  20 #include "log.h"
  21
  22 #include <assert.h>
  23 #include <getopt.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27 #ifdef HAVE_SYSTEMD_DAEMON
  28 #include <systemd/sd-daemon.h>
  29 #endif
  30
  31 static void usage(const char *progname)
  32 {
  33         printf("Usage: %s [OPTIONS] [<DRM device>]\n\n"
  34                "Options:\n"
  35                "-h, --help \tPrint this help\n"
  36                "-c, --config \t path to configuration file (default "
  37                "/etc/drm-lease-manager.toml)\n"
  38                "-v, --verbose \tEnable verbose debug messages\n"
  39                "-t, --lease-transfer \tAllow lease transfter to new clients\n"
  40                "-k, --keep-on-crash \tDon't close lease on client crash\n",
  41                progname);
  42 }
  43
  44 const char *opts = "vtkhc:";
  45 const struct option options[] = {
  46     {"help", no_argument, NULL, 'h'},
  47     {"verbose", no_argument, NULL, 'v'},
  48     {"lease-transfer", no_argument, NULL, 't'},
  49     {"keep-on-crash", no_argument, NULL, 'k'},
  50     {"config", required_argument, NULL, 'c'},
  51     {NULL, 0, NULL, 0},
  52 };
  53
  54 int main(int argc, char **argv)
  55 {
  56         char *device = NULL;
  57         char *config_file = "/etc/drm-lease-manager.toml";
  58
  59         bool debug_log = false;
  60         bool can_transfer_leases = false;
  61         bool keep_on_crash = false;
  62
  63         int c;
  64         while ((c = getopt_long(argc, argv, opts, options, NULL)) != -1) {
  65                 int ret = EXIT_FAILURE;
  66                 switch (c) {
  67                 case 'v':
  68                         debug_log = true;
  69                         break;
  70                 case 't':
  71                         can_transfer_leases = true;
  72                         break;
  73                 case 'k':
  74                         keep_on_crash = true;
  75                         break;
  76                 case 'c':
  77                         config_file = optarg;
  78                         break;
  79                 case 'h':
  80                         ret = EXIT_SUCCESS;
  81                         /* fall through */
  82                 default:
  83                         usage(argv[0]);
  84                         return ret;
  85                 }
  86         }
  87
  88         if (optind < argc)
  89                 device = argv[optind];
  90
  91         dlm_log_enable_debug(debug_log);
  92
  93         struct lease_config *lease_configs = NULL;
  94         int num_configs = parse_config(config_file, &lease_configs);
  95
  96         struct lm *lm =
  97             lm_create_with_config(device, num_configs, lease_configs);
  98
  99         if (!lm) {
 100                 ERROR_LOG("DRM Lease initialization failed\n");
 101                 return EXIT_FAILURE;
 102         }
 103
 104         struct lease_handle **lease_handles = NULL;
 105         int count_ids = lm_get_lease_handles(lm, &lease_handles);
 106         assert(count_ids > 0);
 107
 108         struct ls *ls = ls_create(lease_handles, count_ids);
 109         if (!ls) {
 110                 lm_destroy(lm);
 111                 ERROR_LOG("Client socket initialization failed\n");
 112                 return EXIT_FAILURE;
 113         }
 114
 115 #ifdef HAVE_SYSTEMD_DAEMON
 116         sd_notify(1, "READY=1");
 117 #endif
 118
 119         struct ls_req req;
 120         while (ls_get_request(ls, &req)) {
 121                 switch (req.type) {
 122                 case LS_REQ_GET_LEASE: {
 123                         int fd = lm_lease_grant(lm, req.lease_handle);
 124
 125                         if (fd < 0 && can_transfer_leases)
 126                                 fd = lm_lease_transfer(lm, req.lease_handle);
 127
 128                         if (fd < 0) {
 129                                 ERROR_LOG(
 130                                     "Can't fulfill lease request: lease=%s\n",
 131                                     req.lease_handle->name);
 132                                 ls_disconnect_client(ls, req.client);
 133                                 break;
 134                         }
 135
 136                         struct ls_client *active_client =
 137                             req.lease_handle->user_data;
 138                         if (active_client)
 139                                 ls_disconnect_client(ls, active_client);
 140
 141                         req.lease_handle->user_data = req.client;
 142
 143                         if (!ls_send_fd(ls, req.client, fd)) {
 144                                 ERROR_LOG(
 145                                     "Client communication error: lease=%s\n",
 146                                     req.lease_handle->name);
 147                                 ls_disconnect_client(ls, req.client);
 148                                 lm_lease_revoke(lm, req.lease_handle);
 149                         }
 150                         break;
 151                 }
 152                 case LS_REQ_RELEASE_LEASE:
 153                 case LS_REQ_CLIENT_DISCONNECT:
 154                         ls_disconnect_client(ls, req.client);
 155                         req.lease_handle->user_data = NULL;
 156                         lm_lease_revoke(lm, req.lease_handle);
 157
 158                         if (!keep_on_crash || req.type == LS_REQ_RELEASE_LEASE)
 159                                 lm_lease_close(req.lease_handle);
 160
 161                         break;
 162                 default:
 163                         ERROR_LOG("Internal error: Invalid lease request\n");
 164                         goto done;
 165                 }
 166         }
 167 done:
 168         ls_destroy(ls);
 169         lm_destroy(lm);
 170         release_config(num_configs, lease_configs);
 171         return EXIT_FAILURE;
 172 }