rild.c revision c23238d36e15225bade04710e78defadf9d0039e
1/* //device/system/rild/rild.c 2** 3** Copyright 2006 The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#include <stdio.h> 19#include <stdlib.h> 20#include <dlfcn.h> 21#include <string.h> 22#include <stdint.h> 23#include <unistd.h> 24#include <fcntl.h> 25#include <errno.h> 26 27#include <telephony/ril.h> 28#define LOG_TAG "RILD" 29#include <utils/Log.h> 30#include <cutils/properties.h> 31#include <cutils/sockets.h> 32#include <sys/capability.h> 33#include <sys/prctl.h> 34#include <sys/stat.h> 35#include <sys/types.h> 36#include <libril/ril_ex.h> 37 38#include <private/android_filesystem_config.h> 39#include "hardware/qemu_pipe.h" 40 41#define LIB_PATH_PROPERTY "rild.libpath" 42#define LIB_ARGS_PROPERTY "rild.libargs" 43#define MAX_LIB_ARGS 16 44#define MAX_CAP_NUM (CAP_TO_INDEX(CAP_LAST_CAP) + 1) 45 46static void usage(const char *argv0) { 47 fprintf(stderr, "Usage: %s -l <ril impl library> [-- <args for impl library>]\n", argv0); 48 exit(EXIT_FAILURE); 49} 50 51extern char rild[MAX_SOCKET_NAME_LENGTH]; 52 53extern void RIL_register (const RIL_RadioFunctions *callbacks); 54 55extern void RIL_register_socket (RIL_RadioFunctions *(*rilUimInit) 56 (const struct RIL_Env *, int, char **), RIL_SOCKET_TYPE socketType, int argc, char **argv); 57 58extern void RIL_onRequestComplete(RIL_Token t, RIL_Errno e, 59 void *response, size_t responselen); 60 61extern void RIL_onRequestAck(RIL_Token t); 62 63extern void RIL_setRilSocketName(char *); 64 65#if defined(ANDROID_MULTI_SIM) 66extern void RIL_onUnsolicitedResponse(int unsolResponse, const void *data, 67 size_t datalen, RIL_SOCKET_ID socket_id); 68#else 69extern void RIL_onUnsolicitedResponse(int unsolResponse, const void *data, 70 size_t datalen); 71#endif 72 73extern void RIL_requestTimedCallback (RIL_TimedCallback callback, 74 void *param, const struct timeval *relativeTime); 75 76 77static struct RIL_Env s_rilEnv = { 78 RIL_onRequestComplete, 79 RIL_onUnsolicitedResponse, 80 RIL_requestTimedCallback, 81 RIL_onRequestAck 82}; 83 84extern void RIL_startEventLoop(); 85 86static int make_argv(char * args, char ** argv) { 87 // Note: reserve argv[0] 88 int count = 1; 89 char * tok; 90 char * s = args; 91 92 while ((tok = strtok(s, " \0"))) { 93 argv[count] = tok; 94 s = NULL; 95 count++; 96 } 97 return count; 98} 99 100/* 101 * switchUser - Switches UID to radio, preserving CAP_NET_ADMIN capabilities. 102 * Our group, cache, was set by init. 103 */ 104void switchUser() { 105 char debuggable[PROP_VALUE_MAX]; 106 107 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 108 if (setresuid(AID_RADIO, AID_RADIO, AID_RADIO) == -1) { 109 RLOGE("setresuid failed: %s", strerror(errno)); 110 exit(EXIT_FAILURE); 111 } 112 113 struct __user_cap_header_struct header; 114 memset(&header, 0, sizeof(header)); 115 header.version = _LINUX_CAPABILITY_VERSION_3; 116 header.pid = 0; 117 118 struct __user_cap_data_struct data[MAX_CAP_NUM]; 119 memset(&data, 0, sizeof(data)); 120 121 data[CAP_TO_INDEX(CAP_NET_ADMIN)].effective |= CAP_TO_MASK(CAP_NET_ADMIN); 122 data[CAP_TO_INDEX(CAP_NET_ADMIN)].permitted |= CAP_TO_MASK(CAP_NET_ADMIN); 123 124 data[CAP_TO_INDEX(CAP_NET_RAW)].effective |= CAP_TO_MASK(CAP_NET_RAW); 125 data[CAP_TO_INDEX(CAP_NET_RAW)].permitted |= CAP_TO_MASK(CAP_NET_RAW); 126 127 data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].effective |= CAP_TO_MASK(CAP_BLOCK_SUSPEND); 128 data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].permitted |= CAP_TO_MASK(CAP_BLOCK_SUSPEND); 129 130 if (capset(&header, &data[0]) == -1) { 131 RLOGE("capset failed: %s", strerror(errno)); 132 exit(EXIT_FAILURE); 133 } 134 135 /* 136 * Debuggable build only: 137 * Set DUMPABLE that was cleared by setuid() to have tombstone on RIL crash 138 */ 139 property_get("ro.debuggable", debuggable, "0"); 140 if (strcmp(debuggable, "1") == 0) { 141 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0); 142 } 143} 144 145int main(int argc, char **argv) { 146 const char * rilLibPath = NULL; 147 char **rilArgv; 148 void *dlHandle; 149 const RIL_RadioFunctions *(*rilInit)(const struct RIL_Env *, int, char **); 150 const RIL_RadioFunctions *(*rilUimInit)(const struct RIL_Env *, int, char **); 151 char *err_str = NULL; 152 153 const RIL_RadioFunctions *funcs; 154 char libPath[PROPERTY_VALUE_MAX]; 155 unsigned char hasLibArgs = 0; 156 157 int i; 158 const char *clientId = NULL; 159 RLOGD("**RIL Daemon Started**"); 160 RLOGD("**RILd param count=%d**", argc); 161 162 umask(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH); 163 for (i = 1; i < argc ;) { 164 if (0 == strcmp(argv[i], "-l") && (argc - i > 1)) { 165 rilLibPath = argv[i + 1]; 166 i += 2; 167 } else if (0 == strcmp(argv[i], "--")) { 168 i++; 169 hasLibArgs = 1; 170 break; 171 } else if (0 == strcmp(argv[i], "-c") && (argc - i > 1)) { 172 clientId = argv[i+1]; 173 i += 2; 174 } else { 175 usage(argv[0]); 176 } 177 } 178 179 if (clientId == NULL) { 180 clientId = "0"; 181 } else if (atoi(clientId) >= MAX_RILDS) { 182 RLOGE("Max Number of rild's supported is: %d", MAX_RILDS); 183 exit(0); 184 } 185 if (strncmp(clientId, "0", MAX_CLIENT_ID_LENGTH)) { 186 strlcat(rild, clientId, MAX_SOCKET_NAME_LENGTH); 187 Ril_setRilSocketName(rild); 188 } 189 190 if (rilLibPath == NULL) { 191 if ( 0 == property_get(LIB_PATH_PROPERTY, libPath, NULL)) { 192 // No lib sepcified on the command line, and nothing set in props. 193 // Assume "no-ril" case. 194 goto done; 195 } else { 196 rilLibPath = libPath; 197 } 198 } 199 200 /* special override when in the emulator */ 201#if 1 202 { 203 static char* arg_overrides[5]; 204 static char arg_device[32]; 205 int done = 0; 206 207#define REFERENCE_RIL_PATH "libreference-ril.so" 208 209 /* first, read /proc/cmdline into memory */ 210 char buffer[1024] = {'\0'}, *p, *q; 211 int len; 212 int fd = open("/proc/cmdline",O_RDONLY); 213 214 if (fd < 0) { 215 RLOGD("could not open /proc/cmdline:%s", strerror(errno)); 216 goto OpenLib; 217 } 218 219 do { 220 len = read(fd,buffer,sizeof(buffer)); } 221 while (len == -1 && errno == EINTR); 222 223 if (len < 0) { 224 RLOGD("could not read /proc/cmdline:%s", strerror(errno)); 225 close(fd); 226 goto OpenLib; 227 } 228 close(fd); 229 230 if (strstr(buffer, "android.qemud=") != NULL) 231 { 232 /* the qemud daemon is launched after rild, so 233 * give it some time to create its GSM socket 234 */ 235 int tries = 5; 236#define QEMUD_SOCKET_NAME "qemud" 237 238 while (1) { 239 int fd; 240 241 sleep(1); 242 243 fd = qemu_pipe_open("qemud:gsm"); 244 if (fd < 0) { 245 fd = socket_local_client( 246 QEMUD_SOCKET_NAME, 247 ANDROID_SOCKET_NAMESPACE_RESERVED, 248 SOCK_STREAM ); 249 } 250 if (fd >= 0) { 251 close(fd); 252 snprintf( arg_device, sizeof(arg_device), "%s/%s", 253 ANDROID_SOCKET_DIR, QEMUD_SOCKET_NAME ); 254 255 arg_overrides[1] = "-s"; 256 arg_overrides[2] = arg_device; 257 done = 1; 258 break; 259 } 260 RLOGD("could not connect to %s socket: %s", 261 QEMUD_SOCKET_NAME, strerror(errno)); 262 if (--tries == 0) 263 break; 264 } 265 if (!done) { 266 RLOGE("could not connect to %s socket (giving up): %s", 267 QEMUD_SOCKET_NAME, strerror(errno)); 268 while(1) 269 sleep(0x00ffffff); 270 } 271 } 272 273 /* otherwise, try to see if we passed a device name from the kernel */ 274 if (!done) do { 275#define KERNEL_OPTION "android.ril=" 276#define DEV_PREFIX "/dev/" 277 278 p = strstr( buffer, KERNEL_OPTION ); 279 if (p == NULL) 280 break; 281 282 p += sizeof(KERNEL_OPTION)-1; 283 q = strpbrk( p, " \t\n\r" ); 284 if (q != NULL) 285 *q = 0; 286 287 snprintf( arg_device, sizeof(arg_device), DEV_PREFIX "%s", p ); 288 arg_device[sizeof(arg_device)-1] = 0; 289 arg_overrides[1] = "-d"; 290 arg_overrides[2] = arg_device; 291 done = 1; 292 293 } while (0); 294 295 if (done) { 296 argv = arg_overrides; 297 argc = 3; 298 i = 1; 299 hasLibArgs = 1; 300 rilLibPath = REFERENCE_RIL_PATH; 301 302 RLOGD("overriding with %s %s", arg_overrides[1], arg_overrides[2]); 303 } 304 } 305OpenLib: 306#endif 307 switchUser(); 308 309 dlHandle = dlopen(rilLibPath, RTLD_NOW); 310 311 if (dlHandle == NULL) { 312 RLOGE("dlopen failed: %s", dlerror()); 313 exit(EXIT_FAILURE); 314 } 315 316 RIL_startEventLoop(); 317 318 rilInit = 319 (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **)) 320 dlsym(dlHandle, "RIL_Init"); 321 322 if (rilInit == NULL) { 323 RLOGE("RIL_Init not defined or exported in %s\n", rilLibPath); 324 exit(EXIT_FAILURE); 325 } 326 327 dlerror(); // Clear any previous dlerror 328 rilUimInit = 329 (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **)) 330 dlsym(dlHandle, "RIL_SAP_Init"); 331 err_str = dlerror(); 332 if (err_str) { 333 RLOGW("RIL_SAP_Init not defined or exported in %s: %s\n", rilLibPath, err_str); 334 } else if (!rilUimInit) { 335 RLOGW("RIL_SAP_Init defined as null in %s. SAP Not usable\n", rilLibPath); 336 } 337 338 if (hasLibArgs) { 339 rilArgv = argv + i - 1; 340 argc = argc -i + 1; 341 } else { 342 static char * newArgv[MAX_LIB_ARGS]; 343 static char args[PROPERTY_VALUE_MAX]; 344 rilArgv = newArgv; 345 property_get(LIB_ARGS_PROPERTY, args, ""); 346 argc = make_argv(args, rilArgv); 347 } 348 349 rilArgv[argc++] = "-c"; 350 rilArgv[argc++] = clientId; 351 RLOGD("RIL_Init argc = %d clientId = %s", argc, rilArgv[argc-1]); 352 353 // Make sure there's a reasonable argv[0] 354 rilArgv[0] = argv[0]; 355 356 funcs = rilInit(&s_rilEnv, argc, rilArgv); 357 RLOGD("RIL_Init rilInit completed"); 358 359 RIL_register(funcs); 360 361 RLOGD("RIL_Init RIL_register completed"); 362 363 if (rilUimInit) { 364 RLOGD("RIL_register_socket started"); 365 RIL_register_socket(rilUimInit, RIL_SAP_SOCKET, argc, rilArgv); 366 } 367 368 RLOGD("RIL_register_socket completed"); 369 370done: 371 372 RLOGD("RIL_Init starting sleep loop"); 373 while (true) { 374 sleep(UINT32_MAX); 375 } 376} 377