git.ozlabs.org Git - petitboot/blob - ui/common/discover-client.c

   1
   2 #include <assert.h>
   3 #include <errno.h>
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <stdint.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 <log/log.h>
  15
  16 #include "discover-client.h"
  17 #include "pb-protocol/pb-protocol.h"
  18
  19 struct discover_client {
  20         int fd;
  21         struct discover_client_ops ops;
  22         int n_devices;
  23         struct device **devices;
  24 };
  25
  26 static int discover_client_destructor(void *arg)
  27 {
  28         struct discover_client *client = arg;
  29
  30         if (client->fd >= 0)
  31                 close(client->fd);
  32
  33         return 0;
  34 }
  35
  36 void discover_client_destroy(struct discover_client *client)
  37 {
  38         talloc_free(client);
  39 }
  40
  41 static struct device *find_device(struct discover_client *client,
  42                 const char *id)
  43 {
  44         int i;
  45
  46         for (i = 0; i < client->n_devices; i++) {
  47                 struct device *dev = client->devices[i];
  48                 if (!strcmp(dev->id, id))
  49                         return dev;
  50         }
  51
  52         return NULL;
  53 }
  54
  55 static void device_add(struct discover_client *client, struct device *device)
  56 {
  57         client->n_devices++;
  58         client->devices = talloc_realloc(client, client->devices,
  59                         struct device *, client->n_devices);
  60
  61         client->devices[client->n_devices - 1] = device;
  62         talloc_steal(client, device);
  63
  64         if (client->ops.device_add)
  65                 client->ops.device_add(device, client->ops.cb_arg);
  66 }
  67
  68 static void boot_option_add(struct discover_client *client,
  69                 struct boot_option *opt)
  70 {
  71         struct device *dev;
  72
  73         dev = find_device(client, opt->device_id);
  74
  75         /* we require that devices are already present before any boot options
  76          * are added */
  77         assert(dev);
  78
  79         talloc_steal(dev, opt);
  80
  81         if (client->ops.boot_option_add)
  82                 client->ops.boot_option_add(dev, opt, client->ops.cb_arg);
  83 }
  84
  85 static void device_remove(struct discover_client *client, const char *id)
  86 {
  87         struct device *device = NULL;
  88         int i;
  89
  90         for (i = 0; i < client->n_devices; i++) {
  91                 if (!strcmp(client->devices[i]->id, id)) {
  92                         device = client->devices[i];
  93                         break;
  94                 }
  95         }
  96
  97         if (!device)
  98                 return;
  99
 100         /* remove the device from the client's device array */
 101         client->n_devices--;
 102         memmove(&client->devices[i], &client->devices[i+1],
 103                         (client->n_devices - i) * sizeof(client->devices[0]));
 104         client->devices = talloc_realloc(client, client->devices,
 105                         struct device *, client->n_devices);
 106
 107         /* notify the UI */
 108         client->ops.device_remove(device, client->ops.cb_arg);
 109
 110         talloc_free(device);
 111 }
 112
 113 static void update_status(struct discover_client *client,
 114                 struct boot_status *status)
 115 {
 116         if (client->ops.update_status)
 117                 client->ops.update_status(status, client->ops.cb_arg);
 118         talloc_free(status);
 119 }
 120
 121 static void update_sysinfo(struct discover_client *client,
 122                 struct system_info *sysinfo)
 123 {
 124         if (client->ops.update_sysinfo)
 125                 client->ops.update_sysinfo(sysinfo, client->ops.cb_arg);
 126         talloc_free(sysinfo);
 127 }
 128
 129 static void update_config(struct discover_client *client,
 130                 struct config *config)
 131 {
 132         if (client->ops.update_config)
 133                 client->ops.update_config(config, client->ops.cb_arg);
 134 }
 135
 136 static int discover_client_process(void *arg)
 137 {
 138         struct discover_client *client = arg;
 139         struct pb_protocol_message *message;
 140         struct system_info *sysinfo;
 141         struct boot_status *status;
 142         struct boot_option *opt;
 143         struct config *config;
 144         struct device *dev;
 145         char *dev_id;
 146         int rc;
 147
 148         message = pb_protocol_read_message(client, client->fd);
 149
 150         if (!message)
 151                 return -1;
 152
 153         switch (message->action) {
 154         case PB_PROTOCOL_ACTION_DEVICE_ADD:
 155                 dev = talloc_zero(client, struct device);
 156                 list_init(&dev->boot_options);
 157
 158                 rc = pb_protocol_deserialise_device(dev, message);
 159                 if (rc) {
 160                         pb_log("%s: no device?\n", __func__);
 161                         return 0;
 162                 }
 163
 164                 device_add(client, dev);
 165                 break;
 166         case PB_PROTOCOL_ACTION_BOOT_OPTION_ADD:
 167                 opt = talloc_zero(client, struct boot_option);
 168
 169                 rc = pb_protocol_deserialise_boot_option(opt, message);
 170                 if (rc) {
 171                         pb_log("%s: no boot_option?\n", __func__);
 172                         return 0;
 173                 }
 174
 175                 boot_option_add(client, opt);
 176                 break;
 177         case PB_PROTOCOL_ACTION_DEVICE_REMOVE:
 178                 dev_id = pb_protocol_deserialise_string(client, message);
 179                 if (!dev_id) {
 180                         pb_log("%s: no device id?\n", __func__);
 181                         return 0;
 182                 }
 183                 device_remove(client, dev_id);
 184                 break;
 185         case PB_PROTOCOL_ACTION_STATUS:
 186                 status = talloc_zero(client, struct boot_status);
 187
 188                 rc = pb_protocol_deserialise_boot_status(status, message);
 189                 if (rc) {
 190                         pb_log("%s: invalid status message?\n", __func__);
 191                         return 0;
 192                 }
 193                 update_status(client, status);
 194                 break;
 195         case PB_PROTOCOL_ACTION_SYSTEM_INFO:
 196                 sysinfo = talloc_zero(client, struct system_info);
 197
 198                 rc = pb_protocol_deserialise_system_info(sysinfo, message);
 199                 if (rc) {
 200                         pb_log("%s: invalid sysinfo message?\n", __func__);
 201                         return 0;
 202                 }
 203                 update_sysinfo(client, sysinfo);
 204                 break;
 205         case PB_PROTOCOL_ACTION_CONFIG:
 206                 config = talloc_zero(ctx, struct config);
 207
 208                 rc = pb_protocol_deserialise_config(config, message);
 209                 if (rc) {
 210                         pb_log("%s: invalid config message?\n", __func__);
 211                         return 0;
 212                 }
 213                 update_config(client, config);
 214                 break;
 215         default:
 216                 pb_log("%s: unknown action %d\n", __func__, message->action);
 217         }
 218
 219
 220         return 0;
 221 }
 222
 223 struct discover_client* discover_client_init(struct waitset *waitset,
 224         const struct discover_client_ops *ops, void *cb_arg)
 225 {
 226         struct discover_client *client;
 227         struct sockaddr_un addr;
 228
 229         client = talloc(NULL, struct discover_client);
 230         if (!client)
 231                 return NULL;
 232
 233         memcpy(&client->ops, ops, sizeof(client->ops));
 234         client->ops.cb_arg = cb_arg;
 235
 236         client->fd = socket(AF_UNIX, SOCK_STREAM, 0);
 237         if (client->fd < 0) {
 238                 pb_log("%s: socket: %s\n", __func__, strerror(errno));
 239                 goto out_err;
 240         }
 241
 242         talloc_set_destructor(client, discover_client_destructor);
 243
 244         client->n_devices = 0;
 245         client->devices = NULL;
 246
 247         addr.sun_family = AF_UNIX;
 248         strcpy(addr.sun_path, PB_SOCKET_PATH);
 249
 250         if (connect(client->fd, (struct sockaddr *)&addr, sizeof(addr))) {
 251                 pb_log("%s: connect: %s\n", __func__, strerror(errno));
 252                 goto out_err;
 253         }
 254
 255         waiter_register_io(waitset, client->fd, WAIT_IN,
 256                         discover_client_process, client);
 257
 258         return client;
 259
 260 out_err:
 261         talloc_free(client);
 262         return NULL;
 263 }
 264
 265 /* accessors for discovered devices */
 266 int discover_client_device_count(struct discover_client *client)
 267 {
 268         return client->n_devices;
 269 }
 270
 271 struct device *discover_client_get_device(struct discover_client *client,
 272                 int index)
 273 {
 274         if (index < 0 || index >= client->n_devices)
 275                 return NULL;
 276
 277         return client->devices[index];
 278 }
 279
 280 static void create_boot_command(struct boot_command *command,
 281                 const struct device *device __attribute__((unused)),
 282                 const struct boot_option *boot_option,
 283                 const struct pb_boot_data *data)
 284 {
 285         command->option_id = boot_option ? boot_option->id : NULL;
 286         command->boot_image_file = data->image;
 287         command->initrd_file = data->initrd;
 288         command->dtb_file = data->dtb;
 289         command->boot_args = data->args;
 290 }
 291
 292 int discover_client_boot(struct discover_client *client,
 293                 const struct device *device,
 294                 const struct boot_option *boot_option,
 295                 const struct pb_boot_data *data)
 296 {
 297         struct pb_protocol_message *message;
 298         struct boot_command boot_command;
 299         int len, rc;
 300
 301         create_boot_command(&boot_command, device, boot_option, data);
 302
 303         len = pb_protocol_boot_len(&boot_command);
 304
 305         message = pb_protocol_create_message(client,
 306                         PB_PROTOCOL_ACTION_BOOT, len);
 307
 308         if (!message)
 309                 return -1;
 310
 311         pb_protocol_serialise_boot_command(&boot_command,
 312                         message->payload, len);
 313
 314         rc = pb_protocol_write_message(client->fd, message);
 315
 316         return rc;
 317 }
 318
 319 int discover_client_cancel_default(struct discover_client *client)
 320 {
 321         struct pb_protocol_message *message;
 322
 323         message = pb_protocol_create_message(client,
 324                         PB_PROTOCOL_ACTION_CANCEL_DEFAULT, 0);
 325
 326         if (!message)
 327                 return -1;
 328
 329         return pb_protocol_write_message(client->fd, message);
 330 }