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1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <stdlib.h>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22 #include <linux/keychord.h>
23 
24 #include "init.h"
25 #include "log.h"
26 #include "property_service.h"
27 
28 static struct input_keychord *keychords = 0;
29 static int keychords_count = 0;
30 static int keychords_length = 0;
31 static int keychord_fd = -1;
32 
add_service_keycodes(struct service * svc)33 void add_service_keycodes(struct service *svc)
34 {
35     struct input_keychord *keychord;
36     int i, size;
37 
38     if (svc->keycodes) {
39         /* add a new keychord to the list */
40         size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
41         keychords = realloc(keychords, keychords_length + size);
42         if (!keychords) {
43             ERROR("could not allocate keychords\n");
44             keychords_length = 0;
45             keychords_count = 0;
46             return;
47         }
48 
49         keychord = (struct input_keychord *)((char *)keychords + keychords_length);
50         keychord->version = KEYCHORD_VERSION;
51         keychord->id = keychords_count + 1;
52         keychord->count = svc->nkeycodes;
53         svc->keychord_id = keychord->id;
54 
55         for (i = 0; i < svc->nkeycodes; i++) {
56             keychord->keycodes[i] = svc->keycodes[i];
57         }
58         keychords_count++;
59         keychords_length += size;
60     }
61 }
62 
keychord_init()63 void keychord_init()
64 {
65     int fd, ret;
66 
67     service_for_each(add_service_keycodes);
68 
69     /* nothing to do if no services require keychords */
70     if (!keychords)
71         return;
72 
73     fd = open("/dev/keychord", O_RDWR);
74     if (fd < 0) {
75         ERROR("could not open /dev/keychord\n");
76         return;
77     }
78     fcntl(fd, F_SETFD, FD_CLOEXEC);
79 
80     ret = write(fd, keychords, keychords_length);
81     if (ret != keychords_length) {
82         ERROR("could not configure /dev/keychord %d (%d)\n", ret, errno);
83         close(fd);
84         fd = -1;
85     }
86 
87     free(keychords);
88     keychords = 0;
89 
90     keychord_fd = fd;
91 }
92 
handle_keychord()93 void handle_keychord()
94 {
95     struct service *svc;
96     const char* debuggable;
97     const char* adb_enabled;
98     int ret;
99     __u16 id;
100 
101     // only handle keychords if ro.debuggable is set or adb is enabled.
102     // the logic here is that bugreports should be enabled in userdebug or eng builds
103     // and on user builds for users that are developers.
104     debuggable = property_get("ro.debuggable");
105     adb_enabled = property_get("init.svc.adbd");
106     ret = read(keychord_fd, &id, sizeof(id));
107     if (ret != sizeof(id)) {
108         ERROR("could not read keychord id\n");
109         return;
110     }
111 
112     if ((debuggable && !strcmp(debuggable, "1")) ||
113         (adb_enabled && !strcmp(adb_enabled, "running"))) {
114         svc = service_find_by_keychord(id);
115         if (svc) {
116             INFO("starting service %s from keychord\n", svc->name);
117             service_start(svc, NULL);
118         } else {
119             ERROR("service for keychord %d not found\n", id);
120         }
121     }
122 }
123 
get_keychord_fd()124 int get_keychord_fd()
125 {
126     return keychord_fd;
127 }
128