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d42e7319 JB |
1 | /* |
2 | * Copyright (c) 2012 Carsten Munk <carsten.munk@gmail.com> | |
3 | * 2008 The Android Open Source Project | |
4 | * 2013 Simon Busch <morphis@gravedo.de> | |
5 | * 2013 Canonical Ltd | |
6 | * | |
7 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
8 | * you may not use this file except in compliance with the License. | |
9 | * You may obtain a copy of the License at | |
10 | * | |
11 | * http://www.apache.org/licenses/LICENSE-2.0 | |
12 | * | |
13 | * Unless required by applicable law or agreed to in writing, software | |
14 | * distributed under the License is distributed on an "AS IS" BASIS, | |
15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
16 | * See the License for the specific language governing permissions and | |
17 | * limitations under the License. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <stddef.h> | |
22 | #include <string.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <fcntl.h> | |
26 | #include <sys/types.h> | |
27 | #include <sys/stat.h> | |
28 | #define __USE_GNU | |
29 | #include <unistd.h> | |
30 | #include <errno.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/un.h> | |
33 | #include <sys/select.h> | |
34 | #include <sys/types.h> | |
35 | #include <netinet/in.h> | |
36 | #include <poll.h> | |
37 | ||
38 | #include <hybris/properties/properties.h> | |
39 | #include "properties_p.h" | |
40 | ||
41 | ||
42 | static const char property_service_socket[] = "/dev/socket/" PROP_SERVICE_NAME; | |
43 | static int send_prop_msg_no_reply = 0; | |
44 | ||
45 | /* Get/Set a property from the Android Init property socket */ | |
46 | static int send_prop_msg(prop_msg_t *msg, | |
47 | void (*propfn)(const char *, const char *, void *), | |
48 | void *cookie) | |
49 | { | |
50 | struct pollfd pollfds[1]; | |
51 | union { | |
52 | struct sockaddr_un addr; | |
53 | struct sockaddr addr_g; | |
54 | } addr; | |
55 | socklen_t alen; | |
56 | size_t namelen; | |
57 | int s; | |
58 | int r; | |
59 | int result = -1; | |
60 | int patched_init = 0; | |
61 | ||
62 | /* if we tried to talk to the server in the past and didn't get a reply, | |
63 | * it's fairly safe to say that init is not patched and this is all | |
64 | * hopeless, so we should just quit while we're ahead | |
65 | */ | |
66 | if (send_prop_msg_no_reply == 1) | |
67 | return -EIO; | |
68 | ||
69 | s = socket(AF_LOCAL, SOCK_STREAM, 0); | |
70 | if (s < 0) { | |
71 | return result; | |
72 | } | |
73 | ||
74 | memset(&addr, 0, sizeof(addr)); | |
75 | namelen = strlen(property_service_socket); | |
76 | strncpy(addr.addr.sun_path, property_service_socket, | |
77 | sizeof(addr.addr.sun_path)); | |
78 | addr.addr.sun_family = AF_LOCAL; | |
79 | alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1; | |
80 | ||
81 | if (TEMP_FAILURE_RETRY(connect(s, &addr.addr_g, alen) < 0)) { | |
82 | close(s); | |
83 | return result; | |
84 | } | |
85 | ||
86 | r = TEMP_FAILURE_RETRY(send(s, msg, sizeof(prop_msg_t), 0)); | |
87 | ||
88 | if (r == sizeof(prop_msg_t)) { | |
89 | pollfds[0].fd = s; | |
90 | pollfds[0].events = 0; | |
91 | // We successfully wrote to the property server, so use recv | |
92 | // in case we need to get a property. Once the other side is | |
93 | // finished, the socket is closed. | |
94 | while ((r = recv(s, msg, sizeof(prop_msg_t), 0)) > 0) { | |
95 | if (r != sizeof(prop_msg_t)) { | |
96 | close(s); | |
97 | return result; | |
98 | } | |
99 | ||
100 | /* If we got a reply, this is a patched init */ | |
101 | if (!patched_init) | |
102 | patched_init = 1; | |
103 | ||
104 | if (propfn) | |
105 | propfn(msg->name, msg->value, cookie); | |
106 | } | |
107 | ||
108 | /* We also just get a close in case of setprop */ | |
109 | if ((r >= 0) && (patched_init || | |
110 | (msg->cmd == PROP_MSG_SETPROP))) { | |
111 | result = 0; | |
112 | } else { | |
113 | send_prop_msg_no_reply = 1; | |
114 | } | |
115 | } | |
116 | ||
117 | close(s); | |
118 | return result; | |
119 | } | |
120 | ||
121 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), | |
122 | void *cookie) | |
123 | { | |
124 | int err; | |
125 | prop_msg_t msg; | |
126 | ||
127 | memset(&msg, 0, sizeof(msg)); | |
128 | msg.cmd = PROP_MSG_LISTPROP; | |
129 | ||
130 | err = send_prop_msg(&msg, propfn, cookie); | |
131 | if (err < 0) { | |
132 | return err; | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int property_get_socket(const char *key, char *value, const char *default_value) | |
139 | { | |
140 | int err; | |
141 | prop_msg_t msg; | |
142 | ||
143 | memset(&msg, 0, sizeof(msg)); | |
144 | msg.cmd = PROP_MSG_GETPROP; | |
145 | ||
146 | if (key) { | |
147 | strncpy(msg.name, key, sizeof(msg.name)); | |
148 | err = send_prop_msg(&msg, NULL, NULL); | |
149 | if (err < 0) | |
150 | return err; | |
151 | } | |
152 | ||
153 | /* In case it's null, just use the default */ | |
154 | if ((strlen(msg.value) == 0) && (default_value)) { | |
155 | if (strlen(default_value) >= PROP_VALUE_MAX -1) return -1; | |
156 | strcpy(msg.value, default_value); | |
157 | } | |
158 | ||
159 | strcpy(value, msg.value); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | int property_get(const char *key, char *value, const char *default_value) | |
165 | { | |
166 | char *ret = NULL; | |
167 | ||
168 | if ((key) && (strlen(key) >= PROP_NAME_MAX -1)) return -1; | |
169 | if (value == NULL) return -1; | |
170 | ||
171 | if (property_get_socket(key, value, default_value) == 0) | |
172 | return strlen(value); | |
173 | ||
174 | /* In case the socket is not available, search the property file cache by hand */ | |
175 | ret = hybris_propcache_find(key); | |
176 | ||
177 | if (ret) { | |
178 | strcpy(value, ret); | |
179 | free(ret); | |
180 | return strlen(value); | |
181 | } else if (default_value != NULL) { | |
182 | strcpy(value, default_value); | |
183 | return strlen(value); | |
184 | } else { | |
185 | value = '\0'; | |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | int property_set(const char *key, const char *value) | |
192 | { | |
193 | int err; | |
194 | prop_msg_t msg; | |
195 | ||
196 | if (key == 0) return -1; | |
197 | if (value == 0) value = ""; | |
198 | if (strlen(key) >= PROP_NAME_MAX -1) return -1; | |
199 | if (strlen(value) >= PROP_VALUE_MAX -1) return -1; | |
200 | ||
201 | memset(&msg, 0, sizeof(msg)); | |
202 | msg.cmd = PROP_MSG_SETPROP; | |
203 | strncpy(msg.name, key, sizeof(msg.name)); | |
204 | strncpy(msg.value, value, sizeof(msg.value)); | |
205 | ||
206 | err = send_prop_msg(&msg, NULL, NULL); | |
207 | if (err < 0) { | |
208 | return err; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | // vim:ts=4:sw=4:noexpandtab |