ui/common: Add code to send cancel-default messages
[petitboot] / 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->boot_args = data->args;
253 }
254
255 int discover_client_boot(struct discover_client *client,
256                 const struct device *device,
257                 const struct boot_option *boot_option,
258                 const struct pb_boot_data *data)
259 {
260         struct pb_protocol_message *message;
261         struct boot_command boot_command;
262         int len, rc;
263
264         create_boot_command(&boot_command, device, boot_option, data);
265
266         len = pb_protocol_boot_len(&boot_command);
267
268         message = pb_protocol_create_message(client,
269                         PB_PROTOCOL_ACTION_BOOT, len);
270
271         if (!message)
272                 return -1;
273
274         pb_protocol_serialise_boot_command(&boot_command,
275                         message->payload, len);
276
277         rc = pb_protocol_write_message(client->fd, message);
278
279         return rc;
280 }
281
282 int discover_client_cancel_default(struct discover_client *client)
283 {
284         struct pb_protocol_message *message;
285
286         message = pb_protocol_create_message(client,
287                         PB_PROTOCOL_ACTION_CANCEL_DEFAULT, 0);
288
289         if (!message)
290                 return -1;
291
292         return pb_protocol_write_message(client->fd, message);
293 }