rild.c revision 6ff9a87b250598ea9e383f06a4257512bd0c8046 
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    setuid(AID_RADIO);
109
110    struct __user_cap_header_struct header;
111    memset(&header, 0, sizeof(header));
112    header.version = _LINUX_CAPABILITY_VERSION_3;
113    header.pid = 0;
114
115    struct __user_cap_data_struct data[MAX_CAP_NUM];
116    memset(&data, 0, sizeof(data));
117
118    data[CAP_TO_INDEX(CAP_NET_ADMIN)].effective |= CAP_TO_MASK(CAP_NET_ADMIN);
119    data[CAP_TO_INDEX(CAP_NET_ADMIN)].permitted |= CAP_TO_MASK(CAP_NET_ADMIN);
120
121    data[CAP_TO_INDEX(CAP_NET_RAW)].effective |= CAP_TO_MASK(CAP_NET_RAW);
122    data[CAP_TO_INDEX(CAP_NET_RAW)].permitted |= CAP_TO_MASK(CAP_NET_RAW);
123
124    data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].effective |= CAP_TO_MASK(CAP_BLOCK_SUSPEND);
125    data[CAP_TO_INDEX(CAP_BLOCK_SUSPEND)].permitted |= CAP_TO_MASK(CAP_BLOCK_SUSPEND);
126
127    if (capset(&header, &data[0]) == -1) {
128        RLOGE("capset failed: %s", strerror(errno));
129        exit(EXIT_FAILURE);
130    }
131
132    /*
133     * Debuggable build only:
134     * Set DUMPABLE that was cleared by setuid() to have tombstone on RIL crash
135     */
136    property_get("ro.debuggable", debuggable, "0");
137    if (strcmp(debuggable, "1") == 0) {
138        prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
139    }
140}
141
142int main(int argc, char **argv) {
143    const char * rilLibPath = NULL;
144    char **rilArgv;
145    void *dlHandle;
146    const RIL_RadioFunctions *(*rilInit)(const struct RIL_Env *, int, char **);
147    const RIL_RadioFunctions *(*rilUimInit)(const struct RIL_Env *, int, char **);
148    char *err_str = NULL;
149
150    const RIL_RadioFunctions *funcs;
151    char libPath[PROPERTY_VALUE_MAX];
152    unsigned char hasLibArgs = 0;
153
154    int i;
155    const char *clientId = NULL;
156    RLOGD("**RIL Daemon Started**");
157    RLOGD("**RILd param count=%d**", argc);
158
159    umask(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);
160    for (i = 1; i < argc ;) {
161        if (0 == strcmp(argv[i], "-l") && (argc - i > 1)) {
162            rilLibPath = argv[i + 1];
163            i += 2;
164        } else if (0 == strcmp(argv[i], "--")) {
165            i++;
166            hasLibArgs = 1;
167            break;
168        } else if (0 == strcmp(argv[i], "-c") &&  (argc - i > 1)) {
169            clientId = argv[i+1];
170            i += 2;
171        } else {
172            usage(argv[0]);
173        }
174    }
175
176    if (clientId == NULL) {
177        clientId = "0";
178    } else if (atoi(clientId) >= MAX_RILDS) {
179        RLOGE("Max Number of rild's supported is: %d", MAX_RILDS);
180        exit(0);
181    }
182    if (strncmp(clientId, "0", MAX_CLIENT_ID_LENGTH)) {
183        RIL_setRilSocketName(strncat(rild, clientId, MAX_SOCKET_NAME_LENGTH));
184    }
185
186    if (rilLibPath == NULL) {
187        if ( 0 == property_get(LIB_PATH_PROPERTY, libPath, NULL)) {
188            // No lib sepcified on the command line, and nothing set in props.
189            // Assume "no-ril" case.
190            goto done;
191        } else {
192            rilLibPath = libPath;
193        }
194    }
195
196    /* special override when in the emulator */
197#if 1
198    {
199        static char*  arg_overrides[5];
200        static char   arg_device[32];
201        int           done = 0;
202
203#define  REFERENCE_RIL_PATH  "libreference-ril.so"
204
205        /* first, read /proc/cmdline into memory */
206        char          buffer[1024] = {'\0'}, *p, *q;
207        int           len;
208        int           fd = open("/proc/cmdline",O_RDONLY);
209
210        if (fd < 0) {
211            RLOGD("could not open /proc/cmdline:%s", strerror(errno));
212            goto OpenLib;
213        }
214
215        do {
216            len = read(fd,buffer,sizeof(buffer)); }
217        while (len == -1 && errno == EINTR);
218
219        if (len < 0) {
220            RLOGD("could not read /proc/cmdline:%s", strerror(errno));
221            close(fd);
222            goto OpenLib;
223        }
224        close(fd);
225
226        if (strstr(buffer, "android.qemud=") != NULL)
227        {
228            /* the qemud daemon is launched after rild, so
229            * give it some time to create its GSM socket
230            */
231            int  tries = 5;
232#define  QEMUD_SOCKET_NAME    "qemud"
233
234            while (1) {
235                int  fd;
236
237                sleep(1);
238
239                fd = qemu_pipe_open("qemud:gsm");
240                if (fd < 0) {
241                    fd = socket_local_client(
242                                QEMUD_SOCKET_NAME,
243                                ANDROID_SOCKET_NAMESPACE_RESERVED,
244                                SOCK_STREAM );
245                }
246                if (fd >= 0) {
247                    close(fd);
248                    snprintf( arg_device, sizeof(arg_device), "%s/%s",
249                                ANDROID_SOCKET_DIR, QEMUD_SOCKET_NAME );
250
251                    arg_overrides[1] = "-s";
252                    arg_overrides[2] = arg_device;
253                    done = 1;
254                    break;
255                }
256                RLOGD("could not connect to %s socket: %s",
257                    QEMUD_SOCKET_NAME, strerror(errno));
258                if (--tries == 0)
259                    break;
260            }
261            if (!done) {
262                RLOGE("could not connect to %s socket (giving up): %s",
263                    QEMUD_SOCKET_NAME, strerror(errno));
264                while(1)
265                    sleep(0x00ffffff);
266            }
267        }
268
269        /* otherwise, try to see if we passed a device name from the kernel */
270        if (!done) do {
271#define  KERNEL_OPTION  "android.ril="
272#define  DEV_PREFIX     "/dev/"
273
274            p = strstr( buffer, KERNEL_OPTION );
275            if (p == NULL)
276                break;
277
278            p += sizeof(KERNEL_OPTION)-1;
279            q  = strpbrk( p, " \t\n\r" );
280            if (q != NULL)
281                *q = 0;
282
283            snprintf( arg_device, sizeof(arg_device), DEV_PREFIX "%s", p );
284            arg_device[sizeof(arg_device)-1] = 0;
285            arg_overrides[1] = "-d";
286            arg_overrides[2] = arg_device;
287            done = 1;
288
289        } while (0);
290
291        if (done) {
292            argv = arg_overrides;
293            argc = 3;
294            i    = 1;
295            hasLibArgs = 1;
296            rilLibPath = REFERENCE_RIL_PATH;
297
298            RLOGD("overriding with %s %s", arg_overrides[1], arg_overrides[2]);
299        }
300    }
301OpenLib:
302#endif
303    switchUser();
304
305    dlHandle = dlopen(rilLibPath, RTLD_NOW);
306
307    if (dlHandle == NULL) {
308        RLOGE("dlopen failed: %s", dlerror());
309        exit(EXIT_FAILURE);
310    }
311
312    RIL_startEventLoop();
313
314    rilInit =
315        (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))
316        dlsym(dlHandle, "RIL_Init");
317
318    if (rilInit == NULL) {
319        RLOGE("RIL_Init not defined or exported in %s\n", rilLibPath);
320        exit(EXIT_FAILURE);
321    }
322
323    dlerror(); // Clear any previous dlerror
324    rilUimInit =
325        (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))
326        dlsym(dlHandle, "RIL_SAP_Init");
327    err_str = dlerror();
328    if (err_str) {
329        RLOGW("RIL_SAP_Init not defined or exported in %s: %s\n", rilLibPath, err_str);
330    } else if (!rilUimInit) {
331        RLOGW("RIL_SAP_Init defined as null in %s. SAP Not usable\n", rilLibPath);
332    }
333
334    if (hasLibArgs) {
335        rilArgv = argv + i - 1;
336        argc = argc -i + 1;
337    } else {
338        static char * newArgv[MAX_LIB_ARGS];
339        static char args[PROPERTY_VALUE_MAX];
340        rilArgv = newArgv;
341        property_get(LIB_ARGS_PROPERTY, args, "");
342        argc = make_argv(args, rilArgv);
343    }
344
345    rilArgv[argc++] = "-c";
346    rilArgv[argc++] = clientId;
347    RLOGD("RIL_Init argc = %d clientId = %s", argc, rilArgv[argc-1]);
348
349    // Make sure there's a reasonable argv[0]
350    rilArgv[0] = argv[0];
351
352    funcs = rilInit(&s_rilEnv, argc, rilArgv);
353    RLOGD("RIL_Init rilInit completed");
354
355    RIL_register(funcs);
356
357    RLOGD("RIL_Init RIL_register completed");
358
359    if (rilUimInit) {
360        RLOGD("RIL_register_socket started");
361        RIL_register_socket(rilUimInit, RIL_SAP_SOCKET, argc, rilArgv);
362    }
363
364    RLOGD("RIL_register_socket completed");
365
366done:
367
368    RLOGD("RIL_Init starting sleep loop");
369    while (true) {
370        sleep(UINT32_MAX);
371    }
372}
373