wg-quick: android: use Binder for setting DNS on Android 10
Signed-off-by: Nicolas Douma <nicolas@serveur.io> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Nicolas Douma
Jason A. Donenfeld
parent
959937672a
commit
792727cf64
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@ -20,6 +20,7 @@
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#include <unistd.h>
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#include <unistd.h>
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#include <errno.h>
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#include <errno.h>
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#include <regex.h>
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#include <regex.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/wait.h>
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@ -37,6 +38,7 @@
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
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static bool is_exiting = false;
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static bool is_exiting = false;
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static bool binder_available = false;
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static void *xmalloc(size_t size)
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static void *xmalloc(size_t size)
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{
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{
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@ -235,6 +237,373 @@ _printf_(1, 2) static void cndc(const char *cmd_fmt, ...)
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}
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}
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}
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}
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/* Values are from AOSP repository platform/frameworks/native in libs/binder/ndk/include_ndk/android/binder_status.h. */
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enum {
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STATUS_OK = 0,
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STATUS_UNKNOWN_ERROR = -2147483647 - 1,
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STATUS_NO_MEMORY = -ENOMEM,
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STATUS_INVALID_OPERATION = -ENOSYS,
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STATUS_BAD_VALUE = -EINVAL,
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STATUS_BAD_TYPE = STATUS_UNKNOWN_ERROR + 1,
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STATUS_NAME_NOT_FOUND = -ENOENT,
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STATUS_PERMISSION_DENIED = -EPERM,
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STATUS_NO_INIT = -ENODEV,
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STATUS_ALREADY_EXISTS = -EEXIST,
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STATUS_DEAD_OBJECT = -EPIPE,
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STATUS_FAILED_TRANSACTION = STATUS_UNKNOWN_ERROR + 2,
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STATUS_BAD_INDEX = -EOVERFLOW,
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STATUS_NOT_ENOUGH_DATA = -ENODATA,
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STATUS_WOULD_BLOCK = -EWOULDBLOCK,
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STATUS_TIMED_OUT = -ETIMEDOUT,
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STATUS_UNKNOWN_TRANSACTION = -EBADMSG,
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STATUS_FDS_NOT_ALLOWED = STATUS_UNKNOWN_ERROR + 7,
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STATUS_UNEXPECTED_NULL = STATUS_UNKNOWN_ERROR + 8
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};
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enum {
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EX_NONE = 0,
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EX_SECURITY = -1,
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EX_BAD_PARCELABLE = -2,
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EX_ILLEGAL_ARGUMENT = -3,
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EX_NULL_POINTER = -4,
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EX_ILLEGAL_STATE = -5,
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EX_NETWORK_MAIN_THREAD = -6,
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EX_UNSUPPORTED_OPERATION = -7,
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EX_SERVICE_SPECIFIC = -8,
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EX_PARCELABLE = -9,
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EX_TRANSACTION_FAILED = -129
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};
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enum {
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FLAG_ONEWAY = 0x01,
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};
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enum {
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FIRST_CALL_TRANSACTION = 0x00000001,
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LAST_CALL_TRANSACTION = 0x00ffffff
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};
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struct AIBinder;
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struct AParcel;
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struct AStatus;
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struct AIBinder_Class;
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typedef struct AIBinder AIBinder;
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typedef struct AParcel AParcel;
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typedef struct AStatus AStatus;
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typedef struct AIBinder_Class AIBinder_Class;
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typedef int32_t binder_status_t;
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typedef int32_t binder_exception_t;
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typedef uint32_t transaction_code_t;
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typedef uint32_t binder_flags_t;
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typedef void *(*AIBinder_Class_onCreate)(void *args);
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typedef void (*AIBinder_Class_onDestroy)(void *userData);
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typedef binder_status_t (*AIBinder_Class_onTransact)(AIBinder *binder, transaction_code_t code, const AParcel *in, AParcel *out);
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typedef const char *(*AParcel_stringArrayElementGetter)(const void *arrayData, size_t index, int32_t *outLength);
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static AIBinder_Class *(*AIBinder_Class_define)(const char *interfaceDescriptor, AIBinder_Class_onCreate onCreate, AIBinder_Class_onDestroy onDestroy, AIBinder_Class_onTransact onTransact) __attribute__((warn_unused_result));
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static bool (*AIBinder_associateClass)(AIBinder *binder, const AIBinder_Class *clazz);
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static void (*AIBinder_decStrong)(AIBinder *binder);
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static binder_status_t (*AIBinder_prepareTransaction)(AIBinder *binder, AParcel **in);
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static binder_status_t (*AIBinder_transact)(AIBinder *binder, transaction_code_t code, AParcel **in, AParcel **out, binder_flags_t flags);
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static binder_status_t (*AIBinder_ping)(AIBinder *binder);
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static binder_status_t (*AIBinder_dump)(AIBinder *binder, int fd, const char **args, uint32_t numArgs);
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static binder_status_t (*AParcel_readStatusHeader)(const AParcel *parcel, AStatus **status);
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static binder_status_t (*AParcel_readBool)(const AParcel *parcel, bool *value);
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static void (*AParcel_delete)(AParcel *parcel);
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static binder_status_t (*AParcel_setDataPosition)(const AParcel *parcel, int32_t position);
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static int32_t (*AParcel_getDataPosition)(const AParcel *parcel);
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static binder_status_t (*AParcel_writeInt32)(AParcel *parcel, int32_t value);
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static binder_status_t (*AParcel_writeStringArray)(AParcel *parcel, const void *arrayData, int32_t length, AParcel_stringArrayElementGetter getter);
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static binder_status_t (*AParcel_writeString)(AParcel *parcel, const char *string, int32_t length);
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static bool (*AStatus_isOk)(const AStatus *status);
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static void (*AStatus_delete)(AStatus *status);
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static binder_exception_t (*AStatus_getExceptionCode)(const AStatus *status);
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static int32_t (*AStatus_getServiceSpecificError)(const AStatus *status);
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static const char* (*AStatus_getMessage)(const AStatus *status);
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static binder_status_t (*AStatus_getStatus)(const AStatus *status);
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static AIBinder *(*AServiceManager_getService)(const char *instance) __attribute__((__warn_unused_result__));
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static __attribute__((__constructor__(65535))) void load_symbols(void)
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{
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void *handle = dlopen("libbinder_ndk.so", RTLD_LAZY);
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binder_available = !!handle;
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if (!binder_available)
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return;
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#define X(symb) do { \
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if (!((symb) = (typeof(symb))dlsym(handle, #symb))) { \
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fprintf(stderr, "Error: unable to import " #symb " from libbinder_ndk.so\n"); \
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exit(ELIBACC); \
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} \
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} while (0)
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X(AIBinder_Class_define);
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X(AIBinder_associateClass);
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X(AIBinder_decStrong);
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X(AIBinder_prepareTransaction);
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X(AIBinder_transact);
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X(AIBinder_ping);
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X(AIBinder_dump);
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X(AParcel_readStatusHeader);
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X(AParcel_readBool);
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X(AParcel_delete);
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X(AParcel_setDataPosition);
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X(AParcel_getDataPosition);
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X(AParcel_writeInt32);
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X(AParcel_writeStringArray);
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X(AParcel_writeString);
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X(AStatus_isOk);
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X(AStatus_delete);
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X(AStatus_getExceptionCode);
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X(AStatus_getServiceSpecificError);
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X(AStatus_getMessage);
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X(AStatus_getStatus);
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X(AServiceManager_getService);
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#undef X
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}
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static void cleanup_binder(AIBinder **binder)
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{
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AIBinder_decStrong(*binder);
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}
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static void cleanup_status(AStatus **status)
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{
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AStatus_delete(*status);
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}
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static void cleanup_parcel(AParcel **parcel)
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{
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AParcel_delete(*parcel);
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}
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#define _cleanup_status_ __attribute__((__cleanup__(cleanup_status)))
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#define _cleanup_parcel_ __attribute__((__cleanup__(cleanup_parcel)))
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#define _cleanup_binder_ __attribute__((__cleanup__(cleanup_binder)))
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static int32_t string_size(const char *str)
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{
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return str ? strlen(str) : -1;
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}
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static int32_t string_array_size(char *const *array)
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{
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int32_t size = -1;
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if (!array)
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return size;
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for (size = 0; array[size]; ++size);
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return size;
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}
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static const char *string_array_getter(const void *array_data, size_t index, int32_t *outlength)
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{
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const char **array = (const char **)array_data;
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*outlength = array[index] ? strlen(array[index]) : -1;
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return array[index];
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}
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static binder_status_t meaningful_binder_status(const AStatus *status_out)
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{
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binder_status_t status = STATUS_OK;
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binder_exception_t exc_code;
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int32_t exc_code_service;
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const char *message;
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if (!AStatus_isOk(status_out)) {
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exc_code = AStatus_getExceptionCode(status_out);
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if (exc_code == EX_TRANSACTION_FAILED) {
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status = AStatus_getStatus(status_out);
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fprintf(stderr, "Error: transaction failed: %d\n", status);
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}
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else {
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message = AStatus_getMessage(status_out);
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if (exc_code == EX_SERVICE_SPECIFIC) {
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exc_code_service = AStatus_getServiceSpecificError(status_out);
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fprintf(stderr, "Error: service specific exception code: %d%s%s\n", exc_code_service, message ? ": " : "", message ?: "");
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}
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else
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fprintf(stderr, "Error: exception code: %d%s%s\n", exc_code, message ? ": " : "", message ?: "");
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status = STATUS_FAILED_TRANSACTION;
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}
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}
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return status;
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}
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/* These values are default values observed in AOSP. */
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enum {
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DNSRESOLVER_SAMPLE_VALIDITY = 1800 /* sec */,
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DNSRESOLVER_SUCCESS_THRESHOLD = 25,
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DNSRESOLVER_MIN_SAMPLES = 8,
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DNSRESOLVER_MAX_SAMPLES = 8,
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DNSRESOLVER_BASE_TIMEOUT = 5000 /* msec */,
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DNSRESOLVER_RETRY_COUNT = 2
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};
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struct dnsresolver_params {
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int32_t netid;
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int32_t sample_validity_seconds;
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int32_t success_threshold;
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int32_t min_samples;
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int32_t max_samples;
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int32_t base_timeout_msec;
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int32_t retry_count;
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char **servers; /* NULL terminated array of zero-terminated UTF-8 strings */
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char **domains; /* NULL terminated array of zero-terminated UTF-8 strings */
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char *tls_name; /* zero-terminated UTF-8 string */
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char **tls_servers; /* NULL terminated array of zero-terminated UTF-8 strings */
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char **tls_fingerprints; /* NULL terminated array of zero-terminated UTF-8 strings */
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};
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static void *on_create()
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{
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fprintf(stderr, "Error: on_create called on proxy object\n");
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exit(ENOTSUP);
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return NULL;
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}
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static void on_destroy()
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{
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fprintf(stderr, "Error: on_destroy called on proxy object\n");
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exit(ENOTSUP);
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}
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static binder_status_t on_transact()
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{
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fprintf(stderr, "Error: on_transact called on a proxy object\n");
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exit(ENOTSUP);
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return 0;
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}
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static AIBinder *dnsresolver_get_handle(void)
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{
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AIBinder *binder;
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AIBinder_Class *clazz;
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if (!binder_available)
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return NULL;
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binder = AServiceManager_getService("dnsresolver");
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if (!binder)
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return NULL;
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clazz = AIBinder_Class_define("android.net.IDnsResolver", &on_create, &on_destroy, &on_transact);
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if (!clazz)
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goto error;
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if (!AIBinder_associateClass(binder, clazz))
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goto error;
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return binder;
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error:
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AIBinder_decStrong(binder);
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return NULL;
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}
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static int32_t dnsresolver_create_network_cache(void *handle, int32_t netid)
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{
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AIBinder *const binder = handle;
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binder_status_t status;
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_cleanup_parcel_ AParcel *parcel_in = NULL;
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_cleanup_parcel_ AParcel *parcel_out = NULL;
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_cleanup_status_ AStatus *status_out = NULL;
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status = AIBinder_prepareTransaction(binder, &parcel_in);
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if (status != STATUS_OK)
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return status;
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status = AParcel_writeInt32(parcel_in, netid);
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if (status != STATUS_OK)
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return status;
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status = AIBinder_transact(binder, FIRST_CALL_TRANSACTION + 7 /* createNetworkCache */, &parcel_in, &parcel_out, 0);
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if (status != STATUS_OK)
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return status;
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status = AParcel_readStatusHeader(parcel_out, &status_out);
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if (status != STATUS_OK)
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return status;
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if (!AStatus_isOk(status_out))
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return meaningful_binder_status(status_out);
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return STATUS_OK;
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}
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static int32_t dnsresolver_set_resolver_configuration(void *handle, const struct dnsresolver_params *params)
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|
{
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AIBinder *const binder = handle;
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binder_status_t status;
|
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_cleanup_parcel_ AParcel *parcel_in = NULL;
|
||||||
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_cleanup_parcel_ AParcel *parcel_out = NULL;
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_cleanup_status_ AStatus *status_out = NULL;
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int32_t start_position, end_position;
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status = AIBinder_prepareTransaction(binder, &parcel_in);
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|
if (status != STATUS_OK)
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|
return status;
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||||||
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status = AParcel_writeInt32(parcel_in, 1);
|
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|
if (status != STATUS_OK)
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return status;
|
||||||
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||||||
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start_position = AParcel_getDataPosition(parcel_in);
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status = AParcel_writeInt32(parcel_in, 0);
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|
if (status != STATUS_OK)
|
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|
return status;
|
||||||
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|
||||||
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status = AParcel_writeInt32(parcel_in, params->netid);
|
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|
if (status != STATUS_OK)
|
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|
return status;
|
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status = AParcel_writeInt32(parcel_in, params->sample_validity_seconds);
|
||||||
|
if (status != STATUS_OK)
|
||||||
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return status;
|
||||||
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status = AParcel_writeInt32(parcel_in, params->success_threshold);
|
||||||
|
if (status != STATUS_OK)
|
||||||
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return status;
|
||||||
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status = AParcel_writeInt32(parcel_in, params->min_samples);
|
||||||
|
if (status != STATUS_OK)
|
||||||
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return status;
|
||||||
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status = AParcel_writeInt32(parcel_in, params->max_samples);
|
||||||
|
if (status != STATUS_OK)
|
||||||
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return status;
|
||||||
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status = AParcel_writeInt32(parcel_in, params->base_timeout_msec);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
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status = AParcel_writeInt32(parcel_in, params->retry_count);
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||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeStringArray(parcel_in, params->servers, string_array_size(params->servers), &string_array_getter);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeStringArray(parcel_in, params->domains, string_array_size(params->domains), &string_array_getter);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeString(parcel_in, params->tls_name, string_size(params->tls_name));
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeStringArray(parcel_in, params->tls_servers, string_array_size(params->tls_servers), &string_array_getter);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeStringArray(parcel_in, params->tls_fingerprints, string_array_size(params->tls_fingerprints), &string_array_getter);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
|
||||||
|
end_position = AParcel_getDataPosition(parcel_in);
|
||||||
|
status = AParcel_setDataPosition(parcel_in, start_position);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_writeInt32(parcel_in, end_position - start_position);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
status = AParcel_setDataPosition(parcel_in, end_position);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
|
||||||
|
status = AIBinder_transact(binder, FIRST_CALL_TRANSACTION + 2 /* setResolverConfiguration */, &parcel_in, &parcel_out, 0);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
|
||||||
|
status = AParcel_readStatusHeader(parcel_out, &status_out);
|
||||||
|
if (status != STATUS_OK)
|
||||||
|
return status;
|
||||||
|
|
||||||
|
return meaningful_binder_status(status_out);
|
||||||
|
}
|
||||||
|
|
||||||
static void auto_su(int argc, char *argv[])
|
static void auto_su(int argc, char *argv[])
|
||||||
{
|
{
|
||||||
char *args[argc + 4];
|
char *args[argc + 4];
|
||||||
|
|
@ -440,22 +809,75 @@ static void set_dnses(unsigned int netid, const char *dnses)
|
||||||
if (len > (1<<16))
|
if (len > (1<<16))
|
||||||
return;
|
return;
|
||||||
_cleanup_free_ char *mutable = xstrdup(dnses);
|
_cleanup_free_ char *mutable = xstrdup(dnses);
|
||||||
_cleanup_free_ char *arglist = xmalloc(len * 4 + 1);
|
_cleanup_free_ char *shell_arglist = xmalloc(len * 4 + 1);
|
||||||
|
_cleanup_free_ char *function_arglist = xmalloc(len * 4 + 1);
|
||||||
_cleanup_free_ char *arg = xmalloc(len + 4);
|
_cleanup_free_ char *arg = xmalloc(len + 4);
|
||||||
|
_cleanup_free_ char **dns_list = NULL;
|
||||||
|
_cleanup_binder_ AIBinder *handle = NULL;
|
||||||
|
size_t dns_list_size = 0;
|
||||||
|
|
||||||
if (!len)
|
if (!len)
|
||||||
return;
|
return;
|
||||||
arglist[0] = '\0';
|
for (char *dns = strtok(mutable, ", \t\n"); dns; dns = strtok(NULL, ", \t\n")) {
|
||||||
|
if (strchr(dns, '\'') || strchr(dns, '\\'))
|
||||||
|
continue;
|
||||||
|
++dns_list_size;
|
||||||
|
}
|
||||||
|
if (!dns_list_size)
|
||||||
|
return;
|
||||||
|
dns_list = xcalloc(dns_list_size + 1, sizeof(*dns_list));
|
||||||
|
free(mutable);
|
||||||
|
mutable = xstrdup(dnses);
|
||||||
|
|
||||||
|
shell_arglist[0] = '\0';
|
||||||
|
function_arglist[0] = '\0';
|
||||||
|
dns_list_size = 0;
|
||||||
for (char *dns = strtok(mutable, ", \t\n"); dns; dns = strtok(NULL, ", \t\n")) {
|
for (char *dns = strtok(mutable, ", \t\n"); dns; dns = strtok(NULL, ", \t\n")) {
|
||||||
if (strchr(dns, '\'') || strchr(dns, '\\'))
|
if (strchr(dns, '\'') || strchr(dns, '\\'))
|
||||||
continue;
|
continue;
|
||||||
snprintf(arg, len + 3, "'%s' ", dns);
|
snprintf(arg, len + 3, "'%s' ", dns);
|
||||||
strncat(arglist, arg, len * 4 - 1);
|
strncat(shell_arglist, arg, len * 4 - 1);
|
||||||
|
snprintf(arg, len + 2, function_arglist[0] == '\0' ? "%s" : ", %s", dns);
|
||||||
|
strncat(function_arglist, arg, len * 4 - 1);
|
||||||
|
dns_list[dns_list_size++] = dns;
|
||||||
}
|
}
|
||||||
if (!strlen(arglist))
|
|
||||||
return;
|
if ((handle = dnsresolver_get_handle())) {
|
||||||
cndc("resolver setnetdns %u '' %s", netid, arglist);
|
binder_status_t status;
|
||||||
|
|
||||||
|
printf("[#] <binder>::dnsResolver->createNetworkCache(%u)\n", netid);
|
||||||
|
status = dnsresolver_create_network_cache(handle, netid);
|
||||||
|
if (status != 0) {
|
||||||
|
fprintf(stderr, "Error: unable to create network cache\n");
|
||||||
|
exit(ENONET);
|
||||||
|
}
|
||||||
|
|
||||||
|
struct dnsresolver_params params = {
|
||||||
|
.netid = netid,
|
||||||
|
.sample_validity_seconds = DNSRESOLVER_SAMPLE_VALIDITY,
|
||||||
|
.success_threshold = DNSRESOLVER_SUCCESS_THRESHOLD,
|
||||||
|
.min_samples = DNSRESOLVER_MIN_SAMPLES,
|
||||||
|
.max_samples = DNSRESOLVER_MAX_SAMPLES,
|
||||||
|
.base_timeout_msec = DNSRESOLVER_BASE_TIMEOUT,
|
||||||
|
.retry_count = DNSRESOLVER_RETRY_COUNT,
|
||||||
|
.servers = dns_list,
|
||||||
|
.domains = (char *[]){NULL},
|
||||||
|
.tls_name = "",
|
||||||
|
.tls_servers = (char *[]){NULL},
|
||||||
|
.tls_fingerprints = (char *[]){NULL}
|
||||||
|
};
|
||||||
|
|
||||||
|
printf("[#] <binder>::dnsResolver->setResolverConfiguration(%u, [%s], [], %d, %d, %d, %d, %d, %d, [], [])\n",
|
||||||
|
netid, function_arglist, DNSRESOLVER_SAMPLE_VALIDITY, DNSRESOLVER_SUCCESS_THRESHOLD,
|
||||||
|
DNSRESOLVER_MIN_SAMPLES, DNSRESOLVER_MAX_SAMPLES, DNSRESOLVER_BASE_TIMEOUT, DNSRESOLVER_RETRY_COUNT);
|
||||||
|
status = dnsresolver_set_resolver_configuration(handle, ¶ms);
|
||||||
|
|
||||||
|
if (status != 0) {
|
||||||
|
fprintf(stderr, "Error: unable to set DNS servers through Binder: %d\n", status);
|
||||||
|
exit(ENONET);
|
||||||
|
}
|
||||||
|
} else
|
||||||
|
cndc("resolver setnetdns %u '' %s", netid, shell_arglist);
|
||||||
}
|
}
|
||||||
|
|
||||||
static void add_addr(const char *iface, const char *addr)
|
static void add_addr(const char *iface, const char *addr)
|
||||||
|
|
@ -662,8 +1084,8 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
|
||||||
add_if(iface);
|
add_if(iface);
|
||||||
set_config(iface, config);
|
set_config(iface, config);
|
||||||
listen_port = determine_listen_port(iface);
|
listen_port = determine_listen_port(iface);
|
||||||
set_addr(iface, addrs);
|
|
||||||
up_if(&netid, iface, listen_port);
|
up_if(&netid, iface, listen_port);
|
||||||
|
set_addr(iface, addrs);
|
||||||
set_dnses(netid, dnses);
|
set_dnses(netid, dnses);
|
||||||
set_routes(iface, netid);
|
set_routes(iface, netid);
|
||||||
set_mtu(iface, mtu);
|
set_mtu(iface, mtu);
|
||||||
|
|
|
||||||
Reference in New Issue