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
  15 #include "ui/common/device.h"
  16 #include "pb-protocol/pb-protocol.h"
  17 #include "list/list.h"
  18
  19 #include "log.h"
  20 #include "waiter.h"
  21
  22 struct discover_server {
  23         int socket;
  24         struct waiter *waiter;
  25         struct list clients;
  26 };
  27
  28 struct client {
  29         struct list_item list;
  30         int fd;
  31 };
  32
  33
  34 static int server_destructor(void *arg)
  35 {
  36         struct discover_server *server = arg;
  37
  38         if (server->waiter)
  39                 waiter_unregister(server->waiter);
  40
  41         if (server->socket >= 0)
  42                 close(server->socket);
  43
  44         return 0;
  45 }
  46
  47 static int client_destructor(void *arg)
  48 {
  49         struct client *client = arg;
  50
  51         if (client->fd >= 0)
  52                 close(client->fd);
  53
  54         list_remove(&client->list);
  55
  56         return 0;
  57
  58 }
  59
  60 static void print_clients(struct discover_server *server)
  61         __attribute__((unused));
  62
  63 static void print_clients(struct discover_server *server)
  64 {
  65         struct client *client;
  66
  67         printf("current clients [%p,%p,%p]:\n",
  68                         &server->clients.head,
  69                         server->clients.head.prev,
  70                         server->clients.head.next);
  71         list_for_each_entry(&server->clients, client, list)
  72                 printf("\t[%p,%p,%p] client: %d\n", &client->list,
  73                                 client->list.prev, client->list.next,
  74                                 client->fd);
  75 }
  76
  77 static struct boot_option options[] = {
  78         {
  79                 .id = "1.1",
  80                 .name = "meep one",
  81                 .description = "meep description one",
  82                 .icon_file = "meep.one.png",
  83                 .boot_args = "root=/dev/sda1",
  84         },
  85 };
  86
  87 static struct device device = {
  88         .id = "1",
  89         .name = "meep",
  90         .description = "meep description",
  91         .icon_file = "meep.png",
  92         .n_options = 1,
  93         .options = options,
  94 };
  95
  96 static int client_write_message(struct discover_server *server,
  97                 struct client *client, struct pb_protocol_message *message)
  98 {
  99         int rc;
 100
 101         rc = pb_protocol_write_message(client->fd, message);
 102         if (rc)
 103                 talloc_free(client);
 104
 105         return rc;
 106 }
 107
 108 static int write_add_message(struct discover_server *server,
 109                 struct client *client, struct device *dev)
 110 {
 111         struct pb_protocol_message *message;
 112         int len;
 113
 114         len = pb_protocol_device_len(dev);
 115
 116         message = pb_protocol_create_message(client,
 117                         PB_PROTOCOL_ACTION_ADD, len);
 118         if (!message)
 119                 return -1;
 120
 121         pb_protocol_serialise_device(dev, message->payload, len);
 122
 123         return client_write_message(server, client, message);
 124 }
 125
 126 static int write_remove_message(struct discover_server *server,
 127                 struct client *client, char *dev_id)
 128 {
 129         struct pb_protocol_message *message;
 130         int len;
 131
 132         len = strlen(dev_id) + sizeof(uint32_t);
 133
 134         message = pb_protocol_create_message(client,
 135                         PB_PROTOCOL_ACTION_REMOVE, len);
 136         if (!message)
 137                 return -1;
 138
 139         pb_protocol_serialise_string(message->payload, dev_id);
 140
 141         return client_write_message(server, client, message);
 142 }
 143
 144 static int discover_server_process(void *arg)
 145 {
 146         struct discover_server *server = arg;
 147         struct client *client;
 148         int fd;
 149
 150
 151         len = sizeof(addr);
 152
 153         /* accept the incoming connection */
 154         fd = accept(server->socket, NULL, 0);
 155         if (!fd) {
 156                 pb_log("accept: %s\n", strerror(errno));
 157                 return 0;
 158         }
 159
 160         /* add to our list of clients */
 161         client = talloc(server, struct client);
 162         list_add(&server->clients, &client->list);
 163
 164         talloc_set_destructor(client, client_destructor);
 165
 166         client->fd = fd;
 167
 168         /* send existing devices to client */
 169         write_add_message(server, client, &device);
 170
 171         sleep(2);
 172
 173         write_remove_message(server, client, "1");
 174
 175         return 0;
 176 }
 177
 178 struct discover_server *discover_server_init(void)
 179 {
 180         struct discover_server *server;
 181         struct sockaddr_un addr;
 182
 183         server = talloc(NULL, struct discover_server);
 184         if (!server)
 185                 return NULL;
 186
 187         server->waiter = NULL;
 188         list_init(&server->clients);
 189
 190         unlink(PB_SOCKET_PATH);
 191
 192         server->socket = socket(AF_UNIX, SOCK_STREAM, 0);
 193         if (server->socket < 0) {
 194                 pb_log("error creating server socket: %s\n", strerror(errno));
 195                 goto out_err;
 196         }
 197
 198         talloc_set_destructor(server, server_destructor);
 199
 200         addr.sun_family = AF_UNIX;
 201         strcpy(addr.sun_path, PB_SOCKET_PATH);
 202
 203         if (bind(server->socket, (struct sockaddr *)&addr, sizeof(addr))) {
 204                 pb_log("error binding server socket: %s\n", strerror(errno));
 205                 goto out_err;
 206         }
 207
 208         if (listen(server->socket, 8)) {
 209                 pb_log("server socket listen: %s\n", strerror(errno));
 210                 goto out_err;
 211         }
 212
 213         server->waiter = waiter_register(server->socket, WAIT_IN,
 214                         discover_server_process, server);
 215
 216         return server;
 217
 218 out_err:
 219         talloc_free(server);
 220         return NULL;
 221 }
 222
 223 void discover_server_destroy(struct discover_server *server)
 224 {
 225         talloc_free(server);
 226 }
 227