| 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 |