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 int discover_client_process(void *arg)
 122 {
 123         struct discover_client *client = arg;
 124         struct pb_protocol_message *message;
 125         struct boot_status *status;
 126         struct boot_option *opt;
 127         struct device *dev;
 128         char *dev_id;
 129         int rc;
 130
 131         message = pb_protocol_read_message(client, client->fd);
 132
 133         if (!message)
 134                 return -1;
 135
 136         switch (message->action) {
 137         case PB_PROTOCOL_ACTION_DEVICE_ADD:
 138                 dev = talloc_zero(client, struct device);
 139                 list_init(&dev->boot_options);
 140
 141                 rc = pb_protocol_deserialise_device(dev, message);
 142                 if (rc) {
 143                         pb_log("%s: no device?\n", __func__);
 144                         return 0;
 145                 }
 146
 147                 device_add(client, dev);
 148                 break;
 149         case PB_PROTOCOL_ACTION_BOOT_OPTION_ADD:
 150                 opt = talloc_zero(client, struct boot_option);
 151
 152                 rc = pb_protocol_deserialise_boot_option(opt, message);
 153                 if (rc) {
 154                         pb_log("%s: no boot_option?\n", __func__);
 155                         return 0;
 156                 }
 157
 158                 boot_option_add(client, opt);
 159                 break;
 160         case PB_PROTOCOL_ACTION_DEVICE_REMOVE:
 161                 dev_id = pb_protocol_deserialise_string(client, message);
 162                 if (!dev_id) {
 163                         pb_log("%s: no device id?\n", __func__);
 164                         return 0;
 165                 }
 166                 device_remove(client, dev_id);
 167                 break;
 168         case PB_PROTOCOL_ACTION_STATUS:
 169                 status = talloc_zero(client, struct boot_status);
 170
 171                 rc = pb_protocol_deserialise_boot_status(status, message);
 172                 if (rc) {
 173                         pb_log("%s: invalid status message?\n", __func__);
 174                         return 0;
 175                 }
 176                 update_status(client, status);
 177                 break;
 178         default:
 179                 pb_log("%s: unknown action %d\n", __func__, message->action);
 180         }
 181
 182
 183         return 0;
 184 }
 185
 186 struct discover_client* discover_client_init(struct waitset *waitset,
 187         const struct discover_client_ops *ops, void *cb_arg)
 188 {
 189         struct discover_client *client;
 190         struct sockaddr_un addr;
 191
 192         client = talloc(NULL, struct discover_client);
 193         if (!client)
 194                 return NULL;
 195
 196         memcpy(&client->ops, ops, sizeof(client->ops));
 197         client->ops.cb_arg = cb_arg;
 198
 199         client->fd = socket(AF_UNIX, SOCK_STREAM, 0);
 200         if (client->fd < 0) {
 201                 pb_log("%s: socket: %s\n", __func__, strerror(errno));
 202                 goto out_err;
 203         }
 204
 205         talloc_set_destructor(client, discover_client_destructor);
 206
 207         client->n_devices = 0;
 208         client->devices = NULL;
 209
 210         addr.sun_family = AF_UNIX;
 211         strcpy(addr.sun_path, PB_SOCKET_PATH);
 212
 213         if (connect(client->fd, (struct sockaddr *)&addr, sizeof(addr))) {
 214                 pb_log("%s: connect: %s\n", __func__, strerror(errno));
 215                 goto out_err;
 216         }
 217
 218         waiter_register_io(waitset, client->fd, WAIT_IN,
 219                         discover_client_process, client);
 220
 221         return client;
 222
 223 out_err:
 224         talloc_free(client);
 225         return NULL;
 226 }
 227
 228 /* accessors for discovered devices */
 229 int discover_client_device_count(struct discover_client *client)
 230 {
 231         return client->n_devices;
 232 }
 233
 234 struct device *discover_client_get_device(struct discover_client *client,
 235                 int index)
 236 {
 237         if (index < 0 || index >= client->n_devices)
 238                 return NULL;
 239
 240         return client->devices[index];
 241 }
 242
 243 static void create_boot_command(struct boot_command *command,
 244                 const struct device *device __attribute__((unused)),
 245                 const struct boot_option *boot_option,
 246                 const struct pb_boot_data *data)
 247 {
 248
 249         command->option_id = boot_option->id;
 250         command->boot_image_file = data->image;
 251         command->initrd_file = data->initrd;
 252         command->dtb_file = data->dtb;
 253         command->boot_args = data->args;
 254 }
 255
 256 int discover_client_boot(struct discover_client *client,
 257                 const struct device *device,
 258                 const struct boot_option *boot_option,
 259                 const struct pb_boot_data *data)
 260 {
 261         struct pb_protocol_message *message;
 262         struct boot_command boot_command;
 263         int len, rc;
 264
 265         create_boot_command(&boot_command, device, boot_option, data);
 266
 267         len = pb_protocol_boot_len(&boot_command);
 268
 269         message = pb_protocol_create_message(client,
 270                         PB_PROTOCOL_ACTION_BOOT, len);
 271
 272         if (!message)
 273                 return -1;
 274
 275         pb_protocol_serialise_boot_command(&boot_command,
 276                         message->payload, len);
 277
 278         rc = pb_protocol_write_message(client->fd, message);
 279
 280         return rc;
 281 }
 282
 283 int discover_client_cancel_default(struct discover_client *client)
 284 {
 285         struct pb_protocol_message *message;
 286
 287         message = pb_protocol_create_message(client,
 288                         PB_PROTOCOL_ACTION_CANCEL_DEFAULT, 0);
 289
 290         if (!message)
 291                 return -1;
 292
 293         return pb_protocol_write_message(client->fd, message);
 294 }