/* //device/system/rild/rild.c
**
** Copyright 2006 The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <telephony/ril.h>
#define LOG_TAG "RILD"
#include <utils/Log.h>
#include <cutils/properties.h>
#include <cutils/sockets.h>
#include <sys/capability.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <libril/ril_ex.h>
#include <private/android_filesystem_config.h>
#include "hardware/qemu_pipe.h"
#define LIB_PATH_PROPERTY "rild.libpath"
#define LIB_ARGS_PROPERTY "rild.libargs"
#define MAX_LIB_ARGS 16
#define MAX_CAP_NUM (CAP_TO_INDEX(CAP_LAST_CAP) + 1)
static void usage(const char *argv0) {
fprintf(stderr, "Usage: %s -l <ril impl library> [-- <args for impl library>]\n", argv0);
exit(EXIT_FAILURE);
}
extern char rild[MAX_SOCKET_NAME_LENGTH];
extern void RIL_register (const RIL_RadioFunctions *callbacks);
extern void RIL_register_socket (RIL_RadioFunctions *(*rilUimInit)
(const struct RIL_Env *, int, char **), RIL_SOCKET_TYPE socketType, int argc, char **argv);
extern void RIL_onRequestComplete(RIL_Token t, RIL_Errno e,
void *response, size_t responselen);
extern void RIL_onRequestAck(RIL_Token t);
extern void RIL_setRilSocketName(char *);
#if defined(ANDROID_MULTI_SIM)
extern void RIL_onUnsolicitedResponse(int unsolResponse, const void *data,
size_t datalen, RIL_SOCKET_ID socket_id);
#else
extern void RIL_onUnsolicitedResponse(int unsolResponse, const void *data,
size_t datalen);
#endif
extern void RIL_requestTimedCallback (RIL_TimedCallback callback,
void *param, const struct timeval *relativeTime);
static struct RIL_Env s_rilEnv = {
RIL_onRequestComplete,
RIL_onUnsolicitedResponse,
RIL_requestTimedCallback,
RIL_onRequestAck
};
extern void RIL_startEventLoop();
static int make_argv(char * args, char ** argv) {
// Note: reserve argv[0]
int count = 1;
char * tok;
char * s = args;
while ((tok = strtok(s, " \0"))) {
argv[count] = tok;
s = NULL;
count++;
}
return count;
}
/*
* switchUser - Switches UID to radio, preserving CAP_NET_ADMIN capabilities.
* Our group, cache, was set by init.
*/
void switchUser() {
char debuggable[PROP_VALUE_MAX];
prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
if (setresuid(AID_RADIO, AID_RADIO, AID_RADIO) == -1) {
RLOGE("setresuid failed: %s", strerror(errno));
exit(EXIT_FAILURE);
}
struct __user_cap_header_struct header;
memset(&header, 0, sizeof(header));
header.version = _LINUX_CAPABILITY_VERSION_3;
header.pid = 0;
struct __user_cap_data_struct data[MAX_CAP_NUM];
memset(&data, 0, sizeof(data));
data[CAP_TO_INDEX(CAP_NET_ADMIN)].effective |= CAP_TO_MASK(CAP_NET_ADMIN);
data[CAP_TO_INDEX(CAP_NET_ADMIN)].permitted |= CAP_TO_MASK(CAP_NET_ADMIN);
data[CAP_TO_INDEX(CAP_NET_RAW)].effective |= CAP_TO_MASK(CAP_NET_RAW);
data[CAP_TO_INDEX(CAP_NET_RAW)].permitted |= CAP_TO_MASK(CAP_NET_RAW);
data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].effective |= CAP_TO_MASK(CAP_BLOCK_SUSPEND);
data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].permitted |= CAP_TO_MASK(CAP_BLOCK_SUSPEND);
if (capset(&header, &data[0]) == -1) {
RLOGE("capset failed: %s", strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Debuggable build only:
* Set DUMPABLE that was cleared by setuid() to have tombstone on RIL crash
*/
property_get("ro.debuggable", debuggable, "0");
if (strcmp(debuggable, "1") == 0) {
prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
}
}
int main(int argc, char **argv) {
const char * rilLibPath = NULL;
char **rilArgv;
void *dlHandle;
const RIL_RadioFunctions *(*rilInit)(const struct RIL_Env *, int, char **);
RIL_RadioFunctions *(*rilUimInit)(const struct RIL_Env *, int, char **);
const char *err_str = NULL;
const RIL_RadioFunctions *funcs;
char libPath[PROPERTY_VALUE_MAX];
unsigned char hasLibArgs = 0;
int i;
const char *clientId = NULL;
RLOGD("**RIL Daemon Started**");
RLOGD("**RILd param count=%d**", argc);
umask(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);
for (i = 1; i < argc ;) {
if (0 == strcmp(argv[i], "-l") && (argc - i > 1)) {
rilLibPath = argv[i + 1];
i += 2;
} else if (0 == strcmp(argv[i], "--")) {
i++;
hasLibArgs = 1;
break;
} else if (0 == strcmp(argv[i], "-c") && (argc - i > 1)) {
clientId = argv[i+1];
i += 2;
} else {
usage(argv[0]);
}
}
if (clientId == NULL) {
clientId = "0";
} else if (atoi(clientId) >= MAX_RILDS) {
RLOGE("Max Number of rild's supported is: %d", MAX_RILDS);
exit(0);
}
if (strncmp(clientId, "0", MAX_CLIENT_ID_LENGTH)) {
strlcat(rild, clientId, MAX_SOCKET_NAME_LENGTH);
RIL_setRilSocketName(rild);
}
if (rilLibPath == NULL) {
if ( 0 == property_get(LIB_PATH_PROPERTY, libPath, NULL)) {
// No lib sepcified on the command line, and nothing set in props.
// Assume "no-ril" case.
goto done;
} else {
rilLibPath = libPath;
}
}
/* special override when in the emulator */
#if 1
{
static char* arg_overrides[5];
static char arg_device[32];
int done = 0;
#define REFERENCE_RIL_PATH "libreference-ril.so"
/* first, read /proc/cmdline into memory */
char buffer[2048] = {'\0'}, *p, *q;
int len;
struct stat st;
int fd = open("/proc/cmdline",O_RDONLY);
if (fd < 0) {
RLOGE("could not open /proc/cmdline:%s", strerror(errno));
goto OpenLib;
}
if (fstat(fd, &st)) {
RLOGE("fstat error: %s", strerror(errno));
close(fd);
goto OpenLib;
}
if ((unsigned long)st.st_size > sizeof(buffer) - 1) {
RLOGE("Size of /proc/cmdline exceeds buffer");
close(fd);
goto OpenLib;
}
do {
len = read(fd,buffer,sizeof(buffer) - 1); }
while (len == -1 && errno == EINTR);
if (len < 0) {
RLOGE("could not read /proc/cmdline:%s", strerror(errno));
close(fd);
goto OpenLib;
}
close(fd);
if (strstr(buffer, "android.qemud=") != NULL)
{
/* the qemud daemon is launched after rild, so
* give it some time to create its GSM socket
*/
int tries = 5;
#define QEMUD_SOCKET_NAME "qemud"
while (1) {
int fd;
sleep(1);
fd = qemu_pipe_open("qemud:gsm");
if (fd < 0) {
fd = socket_local_client(
QEMUD_SOCKET_NAME,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM );
}
if (fd >= 0) {
close(fd);
snprintf( arg_device, sizeof(arg_device), "%s/%s",
ANDROID_SOCKET_DIR, QEMUD_SOCKET_NAME );
arg_overrides[1] = "-s";
arg_overrides[2] = arg_device;
done = 1;
break;
}
RLOGD("could not connect to %s socket: %s",
QEMUD_SOCKET_NAME, strerror(errno));
if (--tries == 0)
break;
}
if (!done) {
RLOGE("could not connect to %s socket (giving up): %s",
QEMUD_SOCKET_NAME, strerror(errno));
while(1)
sleep(0x00ffffff);
}
}
/* otherwise, try to see if we passed a device name from the kernel */
if (!done) do {
#define KERNEL_OPTION "android.ril="
#define DEV_PREFIX "/dev/"
p = strstr( buffer, KERNEL_OPTION );
if (p == NULL)
break;
p += sizeof(KERNEL_OPTION)-1;
q = strpbrk( p, " \t\n\r" );
if (q != NULL)
*q = 0;
snprintf( arg_device, sizeof(arg_device), DEV_PREFIX "%s", p );
arg_device[sizeof(arg_device)-1] = 0;
arg_overrides[1] = "-d";
arg_overrides[2] = arg_device;
done = 1;
} while (0);
if (done) {
argv = arg_overrides;
argc = 3;
i = 1;
hasLibArgs = 1;
rilLibPath = REFERENCE_RIL_PATH;
RLOGD("overriding with %s %s", arg_overrides[1], arg_overrides[2]);
}
}
OpenLib:
#endif
switchUser();
dlHandle = dlopen(rilLibPath, RTLD_NOW);
if (dlHandle == NULL) {
RLOGE("dlopen failed: %s", dlerror());
exit(EXIT_FAILURE);
}
RIL_startEventLoop();
rilInit =
(const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))
dlsym(dlHandle, "RIL_Init");
if (rilInit == NULL) {
RLOGE("RIL_Init not defined or exported in %s\n", rilLibPath);
exit(EXIT_FAILURE);
}
dlerror(); // Clear any previous dlerror
rilUimInit =
(RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))
dlsym(dlHandle, "RIL_SAP_Init");
err_str = dlerror();
if (err_str) {
RLOGW("RIL_SAP_Init not defined or exported in %s: %s\n", rilLibPath, err_str);
} else if (!rilUimInit) {
RLOGW("RIL_SAP_Init defined as null in %s. SAP Not usable\n", rilLibPath);
}
if (hasLibArgs) {
rilArgv = argv + i - 1;
argc = argc -i + 1;
} else {
static char * newArgv[MAX_LIB_ARGS];
static char args[PROPERTY_VALUE_MAX];
rilArgv = newArgv;
property_get(LIB_ARGS_PROPERTY, args, "");
argc = make_argv(args, rilArgv);
}
rilArgv[argc++] = "-c";
rilArgv[argc++] = clientId;
RLOGD("RIL_Init argc = %d clientId = %s", argc, rilArgv[argc-1]);
// Make sure there's a reasonable argv[0]
rilArgv[0] = argv[0];
funcs = rilInit(&s_rilEnv, argc, rilArgv);
RLOGD("RIL_Init rilInit completed");
RIL_register(funcs);
RLOGD("RIL_Init RIL_register completed");
if (rilUimInit) {
RLOGD("RIL_register_socket started");
RIL_register_socket(rilUimInit, RIL_SAP_SOCKET, argc, rilArgv);
}
RLOGD("RIL_register_socket completed");
done:
RLOGD("RIL_Init starting sleep loop");
while (true) {
sleep(UINT32_MAX);
}
}