git.ozlabs.org Git - petitboot/blob - discover/discover-server.c

   1
   2 #include <unistd.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <stdint.h>
   6 #include <errno.h>
   7 #include <assert.h>
   8
   9 #include <sys/socket.h>
  10 #include <sys/un.h>
  11 #include <asm/byteorder.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <waiter/waiter.h>
  15 #include <log/log.h>
  16
  17 #include "pb-protocol/pb-protocol.h"
  18 #include "list/list.h"
  19
  20 #include "device-handler.h"
  21 #include "discover-server.h"
  22
  23 struct discover_server {
  24         int socket;
  25         struct waitset *waitset;
  26         struct waiter *waiter;
  27         struct list clients;
  28         struct device_handler *device_handler;
  29 };
  30
  31 struct client {
  32         struct discover_server *server;
  33         struct list_item list;
  34         int fd;
  35 };
  36
  37
  38 static int server_destructor(void *arg)
  39 {
  40         struct discover_server *server = arg;
  41
  42         if (server->waiter)
  43                 waiter_remove(server->waiter);
  44
  45         if (server->socket >= 0)
  46                 close(server->socket);
  47
  48         return 0;
  49 }
  50
  51 static int client_destructor(void *arg)
  52 {
  53         struct client *client = arg;
  54
  55         if (client->fd >= 0)
  56                 close(client->fd);
  57
  58         list_remove(&client->list);
  59
  60         return 0;
  61
  62 }
  63
  64 static void print_clients(struct discover_server *server)
  65         __attribute__((unused));
  66
  67 static void print_clients(struct discover_server *server)
  68 {
  69         struct client *client;
  70
  71         pb_log("current clients [%p,%p,%p]:\n",
  72                         &server->clients.head,
  73                         server->clients.head.prev,
  74                         server->clients.head.next);
  75         list_for_each_entry(&server->clients, client, list)
  76                 pb_log("\t[%p,%p,%p] client: %d\n", &client->list,
  77                                 client->list.prev, client->list.next,
  78                                 client->fd);
  79 }
  80
  81 static int client_write_message(
  82                 struct discover_server *server __attribute__((unused)),
  83                 struct client *client, struct pb_protocol_message *message)
  84 {
  85         int rc;
  86
  87         rc = pb_protocol_write_message(client->fd, message);
  88         if (rc)
  89                 talloc_free(client);
  90
  91         return rc;
  92 }
  93
  94 static int write_device_add_message(struct discover_server *server,
  95                 struct client *client, const struct device *dev)
  96 {
  97         struct pb_protocol_message *message;
  98         int len;
  99
 100         len = pb_protocol_device_len(dev);
 101
 102         message = pb_protocol_create_message(client,
 103                         PB_PROTOCOL_ACTION_DEVICE_ADD, len);
 104         if (!message)
 105                 return -1;
 106
 107         pb_protocol_serialise_device(dev, message->payload, len);
 108
 109         return client_write_message(server, client, message);
 110 }
 111
 112 static int write_boot_option_add_message(struct discover_server *server,
 113                 struct client *client, const struct boot_option *opt)
 114 {
 115         struct pb_protocol_message *message;
 116         int len;
 117
 118         len = pb_protocol_boot_option_len(opt);
 119
 120         message = pb_protocol_create_message(client,
 121                         PB_PROTOCOL_ACTION_BOOT_OPTION_ADD, len);
 122         if (!message)
 123                 return -1;
 124
 125         pb_protocol_serialise_boot_option(opt, message->payload, len);
 126
 127         return client_write_message(server, client, message);
 128 }
 129
 130 static int write_device_remove_message(struct discover_server *server,
 131                 struct client *client, char *dev_id)
 132 {
 133         struct pb_protocol_message *message;
 134         int len;
 135
 136         len = strlen(dev_id) + sizeof(uint32_t);
 137
 138         message = pb_protocol_create_message(client,
 139                         PB_PROTOCOL_ACTION_DEVICE_REMOVE, len);
 140         if (!message)
 141                 return -1;
 142
 143         pb_protocol_serialise_string(message->payload, dev_id);
 144
 145         return client_write_message(server, client, message);
 146 }
 147
 148 static int discover_server_process_message(void *arg)
 149 {
 150         struct pb_protocol_message *message;
 151         struct boot_command *boot_command;
 152         struct client *client = arg;
 153         int rc;
 154
 155         message = pb_protocol_read_message(client, client->fd);
 156
 157         if (!message)
 158                 return 0;
 159
 160         if (message->action != PB_PROTOCOL_ACTION_BOOT) {
 161                 pb_log("%s: invalid action %d\n", __func__, message->action);
 162                 return 0;
 163         }
 164
 165         boot_command = talloc(client, struct boot_command);
 166
 167         rc = pb_protocol_deserialise_boot_command(boot_command, message);
 168         if (rc) {
 169                 pb_log("%s: no boot command?", __func__);
 170                 return 0;
 171         }
 172
 173         device_handler_boot(client->server->device_handler, boot_command);
 174
 175         return 0;
 176 }
 177
 178 static int discover_server_process_connection(void *arg)
 179 {
 180         struct discover_server *server = arg;
 181         struct client *client;
 182         int fd, i, n_devices;
 183
 184         /* accept the incoming connection */
 185         fd = accept(server->socket, NULL, 0);
 186         if (!fd) {
 187                 pb_log("accept: %s\n", strerror(errno));
 188                 return 0;
 189         }
 190
 191         /* add to our list of clients */
 192         client = talloc(server, struct client);
 193         list_add(&server->clients, &client->list);
 194
 195         talloc_set_destructor(client, client_destructor);
 196
 197         client->fd = fd;
 198         client->server = server;
 199
 200         /* send existing devices to client */
 201         n_devices = device_handler_get_device_count(server->device_handler);
 202         for (i = 0; i < n_devices; i++) {
 203                 const struct device *device;
 204                 struct boot_option *opt;
 205
 206                 device = device_handler_get_device(server->device_handler, i);
 207                 write_device_add_message(server, client, device);
 208
 209                 list_for_each_entry(&device->boot_options, opt, list)
 210                         discover_server_notify_boot_option_add(server, opt);
 211
 212         }
 213
 214         waiter_register(server->waitset, client->fd, WAIT_IN,
 215                         discover_server_process_message, client);
 216
 217         return 0;
 218 }
 219
 220 void discover_server_notify_device_add(struct discover_server *server,
 221                 struct device *device)
 222 {
 223         struct client *client;
 224
 225         list_for_each_entry(&server->clients, client, list)
 226                 write_device_add_message(server, client, device);
 227
 228 }
 229
 230 void discover_server_notify_boot_option_add(struct discover_server *server,
 231                 struct boot_option *boot_option)
 232 {
 233         struct client *client;
 234
 235         list_for_each_entry(&server->clients, client, list)
 236                 write_boot_option_add_message(server, client, boot_option);
 237 }
 238
 239 void discover_server_notify_device_remove(struct discover_server *server,
 240                 struct device *device)
 241 {
 242         struct client *client;
 243
 244         list_for_each_entry(&server->clients, client, list)
 245                 write_device_remove_message(server, client, device->id);
 246
 247 }
 248
 249 void discover_server_set_device_source(struct discover_server *server,
 250                 struct device_handler *handler)
 251 {
 252         server->device_handler = handler;
 253 }
 254
 255 struct discover_server *discover_server_init(struct waitset *waitset)
 256 {
 257         struct discover_server *server;
 258         struct sockaddr_un addr;
 259
 260         server = talloc(NULL, struct discover_server);
 261         if (!server)
 262                 return NULL;
 263
 264         server->waiter = NULL;
 265         server->waitset = waitset;
 266         list_init(&server->clients);
 267
 268         unlink(PB_SOCKET_PATH);
 269
 270         server->socket = socket(AF_UNIX, SOCK_STREAM, 0);
 271         if (server->socket < 0) {
 272                 pb_log("error creating server socket: %s\n", strerror(errno));
 273                 goto out_err;
 274         }
 275
 276         talloc_set_destructor(server, server_destructor);
 277
 278         addr.sun_family = AF_UNIX;
 279         strcpy(addr.sun_path, PB_SOCKET_PATH);
 280
 281         if (bind(server->socket, (struct sockaddr *)&addr, sizeof(addr))) {
 282                 pb_log("error binding server socket: %s\n", strerror(errno));
 283                 goto out_err;
 284         }
 285
 286         if (listen(server->socket, 8)) {
 287                 pb_log("server socket listen: %s\n", strerror(errno));
 288                 goto out_err;
 289         }
 290
 291         server->waiter = waiter_register(server->waitset, server->socket,
 292                         WAIT_IN, discover_server_process_connection, server);
 293
 294         return server;
 295
 296 out_err:
 297         talloc_free(server);
 298         return NULL;
 299 }
 300
 301 void discover_server_destroy(struct discover_server *server)
 302 {
 303         talloc_free(server);
 304 }
 305