summaryrefslogtreecommitdiffstats
path: root/discover/discover-server.c
blob: b2025cce5e233e4f1232bba021303bb9733b5abe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <assert.h>

#include <sys/socket.h>
#include <sys/un.h>
#include <asm/byteorder.h>

#include <talloc/talloc.h>

#include "pb-protocol/pb-protocol.h"
#include "list/list.h"

#include "log.h"
#include "waiter.h"
#include "device-handler.h"
#include "discover-server.h"

struct discover_server {
	int socket;
	struct waiter *waiter;
	struct list clients;
	struct device_handler *device_handler;
};

struct client {
	struct list_item list;
	int fd;
};


static int server_destructor(void *arg)
{
	struct discover_server *server = arg;

	if (server->waiter)
		waiter_remove(server->waiter);

	if (server->socket >= 0)
		close(server->socket);

	return 0;
}

static int client_destructor(void *arg)
{
	struct client *client = arg;

	if (client->fd >= 0)
		close(client->fd);

	list_remove(&client->list);

	return 0;

}

static void print_clients(struct discover_server *server)
	__attribute__((unused));

static void print_clients(struct discover_server *server)
{
	struct client *client;

	printf("current clients [%p,%p,%p]:\n",
			&server->clients.head,
			server->clients.head.prev,
			server->clients.head.next);
	list_for_each_entry(&server->clients, client, list)
		printf("\t[%p,%p,%p] client: %d\n", &client->list,
				client->list.prev, client->list.next,
				client->fd);
}

static int client_write_message(
		struct discover_server *server __attribute__((unused)),
		struct client *client, struct pb_protocol_message *message)
{
	int rc;

	rc = pb_protocol_write_message(client->fd, message);
	if (rc)
		talloc_free(client);

	return rc;
}

static int write_add_message(struct discover_server *server,
		struct client *client, struct device *dev)
{
	struct pb_protocol_message *message;
	int len;

	len = pb_protocol_device_len(dev);

	message = pb_protocol_create_message(client,
			PB_PROTOCOL_ACTION_ADD, len);
	if (!message)
		return -1;

	pb_protocol_serialise_device(dev, message->payload, len);

	return client_write_message(server, client, message);
}

static int write_remove_message(struct discover_server *server,
		struct client *client, char *dev_id)
{
	struct pb_protocol_message *message;
	int len;

	len = strlen(dev_id) + sizeof(uint32_t);

	message = pb_protocol_create_message(client,
			PB_PROTOCOL_ACTION_REMOVE, len);
	if (!message)
		return -1;

	pb_protocol_serialise_string(message->payload, dev_id);

	return client_write_message(server, client, message);
}

static int discover_server_process(void *arg)
{
	struct discover_server *server = arg;
	struct device *devices;
	struct client *client;
	int fd, i, n_devices;

	/* accept the incoming connection */
	fd = accept(server->socket, NULL, 0);
	if (!fd) {
		pb_log("accept: %s\n", strerror(errno));
		return 0;
	}

	/* add to our list of clients */
	client = talloc(server, struct client);
	list_add(&server->clients, &client->list);

	talloc_set_destructor(client, client_destructor);

	client->fd = fd;

	/* send existing devices to client */
	n_devices = device_handler_get_current_devices(server->device_handler,
			&devices);
	for (i = 0; i < n_devices; i++)
		write_add_message(server, client, &devices[i]);

	return 0;
}

void discover_server_notify_add(struct discover_server *server,
		struct device *device)
{
	struct client *client;

	list_for_each_entry(&server->clients, client, list)
		write_add_message(server, client, device);

}

void discover_server_notify_remove(struct discover_server *server,
		struct device *device)
{
	struct client *client;

	list_for_each_entry(&server->clients, client, list)
		write_remove_message(server, client, device->id);

}

void discover_server_set_device_source(struct discover_server *server,
		struct device_handler *handler)
{
	server->device_handler = handler;
}

struct discover_server *discover_server_init(void)
{
	struct discover_server *server;
	struct sockaddr_un addr;

	server = talloc(NULL, struct discover_server);
	if (!server)
		return NULL;

	server->waiter = NULL;
	list_init(&server->clients);

	unlink(PB_SOCKET_PATH);

	server->socket = socket(AF_UNIX, SOCK_STREAM, 0);
	if (server->socket < 0) {
		pb_log("error creating server socket: %s\n", strerror(errno));
		goto out_err;
	}

	talloc_set_destructor(server, server_destructor);

	addr.sun_family = AF_UNIX;
	strcpy(addr.sun_path, PB_SOCKET_PATH);

	if (bind(server->socket, (struct sockaddr *)&addr, sizeof(addr))) {
		pb_log("error binding server socket: %s\n", strerror(errno));
		goto out_err;
	}

	if (listen(server->socket, 8)) {
		pb_log("server socket listen: %s\n", strerror(errno));
		goto out_err;
	}

	server->waiter = waiter_register(server->socket, WAIT_IN,
			discover_server_process, server);

	return server;

out_err:
	talloc_free(server);
	return NULL;
}

void discover_server_destroy(struct discover_server *server)
{
	talloc_free(server);
}

OpenPOWER on IntegriCloud