aboutsummaryrefslogtreecommitdiffstatshomepage
diff options
context:
space:
mode:
authorNicolas Douma <nicolas@serveur.io>2019-10-02 21:10:51 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2019-10-12 16:49:52 +0200
commitbe09cf5f098e36cf143c4ddd7ca135ec81e70c16 (patch)
tree7ce1fa0148d6a8cbe1249b602dd22c2bbcdb5e5e
parentnoise: recompare stamps after taking write lock (diff)
downloadWireGuard-be09cf5f098e36cf143c4ddd7ca135ec81e70c16.tar.xz
WireGuard-be09cf5f098e36cf143c4ddd7ca135ec81e70c16.zip
wg-quick: android: use Binder for setting DNS on Android 10
Signed-off-by: Nicolas Douma <nicolas@serveur.io>
-rw-r--r--src/tools/wg-quick/android.c436
1 files changed, 429 insertions, 7 deletions
diff --git a/src/tools/wg-quick/android.c b/src/tools/wg-quick/android.c
index e8ea4b4..fefbe38 100644
--- a/src/tools/wg-quick/android.c
+++ b/src/tools/wg-quick/android.c
@@ -20,6 +20,7 @@
#include <unistd.h>
#include <errno.h>
#include <regex.h>
+#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
@@ -37,6 +38,7 @@
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
static bool is_exiting = false;
+static bool binder_available = false;
static void *xmalloc(size_t size)
{
@@ -235,6 +237,373 @@ _printf_(1, 2) static void cndc(const char *cmd_fmt, ...)
}
}
+/* Values are from AOSP repository platform/frameworks/native in libs/binder/ndk/include_ndk/android/binder_status.h. */
+enum {
+ STATUS_OK = 0,
+ STATUS_UNKNOWN_ERROR = -2147483647 - 1,
+ STATUS_NO_MEMORY = -ENOMEM,
+ STATUS_INVALID_OPERATION = -ENOSYS,
+ STATUS_BAD_VALUE = -EINVAL,
+ STATUS_BAD_TYPE = STATUS_UNKNOWN_ERROR + 1,
+ STATUS_NAME_NOT_FOUND = -ENOENT,
+ STATUS_PERMISSION_DENIED = -EPERM,
+ STATUS_NO_INIT = -ENODEV,
+ STATUS_ALREADY_EXISTS = -EEXIST,
+ STATUS_DEAD_OBJECT = -EPIPE,
+ STATUS_FAILED_TRANSACTION = STATUS_UNKNOWN_ERROR + 2,
+ STATUS_BAD_INDEX = -EOVERFLOW,
+ STATUS_NOT_ENOUGH_DATA = -ENODATA,
+ STATUS_WOULD_BLOCK = -EWOULDBLOCK,
+ STATUS_TIMED_OUT = -ETIMEDOUT,
+ STATUS_UNKNOWN_TRANSACTION = -EBADMSG,
+ STATUS_FDS_NOT_ALLOWED = STATUS_UNKNOWN_ERROR + 7,
+ STATUS_UNEXPECTED_NULL = STATUS_UNKNOWN_ERROR + 8
+};
+enum {
+ EX_NONE = 0,
+ EX_SECURITY = -1,
+ EX_BAD_PARCELABLE = -2,
+ EX_ILLEGAL_ARGUMENT = -3,
+ EX_NULL_POINTER = -4,
+ EX_ILLEGAL_STATE = -5,
+ EX_NETWORK_MAIN_THREAD = -6,
+ EX_UNSUPPORTED_OPERATION = -7,
+ EX_SERVICE_SPECIFIC = -8,
+ EX_PARCELABLE = -9,
+ EX_TRANSACTION_FAILED = -129
+};
+enum {
+ FLAG_ONEWAY = 0x01,
+};
+enum {
+ FIRST_CALL_TRANSACTION = 0x00000001,
+ LAST_CALL_TRANSACTION = 0x00ffffff
+};
+struct AIBinder;
+struct AParcel;
+struct AStatus;
+struct AIBinder_Class;
+typedef struct AIBinder AIBinder;
+typedef struct AParcel AParcel;
+typedef struct AStatus AStatus;
+typedef struct AIBinder_Class AIBinder_Class;
+typedef int32_t binder_status_t;
+typedef int32_t binder_exception_t;
+typedef uint32_t transaction_code_t;
+typedef uint32_t binder_flags_t;
+typedef void *(*AIBinder_Class_onCreate)(void *args);
+typedef void (*AIBinder_Class_onDestroy)(void *userData);
+typedef binder_status_t (*AIBinder_Class_onTransact)(AIBinder *binder, transaction_code_t code, const AParcel *in, AParcel *out);
+typedef const char *(*AParcel_stringArrayElementGetter)(const void *arrayData, size_t index, int32_t *outLength);
+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));
+static bool (*AIBinder_associateClass)(AIBinder *binder, const AIBinder_Class *clazz);
+static void (*AIBinder_decStrong)(AIBinder *binder);
+static binder_status_t (*AIBinder_prepareTransaction)(AIBinder *binder, AParcel **in);
+static binder_status_t (*AIBinder_transact)(AIBinder *binder, transaction_code_t code, AParcel **in, AParcel **out, binder_flags_t flags);
+static binder_status_t (*AIBinder_ping)(AIBinder *binder);
+static binder_status_t (*AIBinder_dump)(AIBinder *binder, int fd, const char **args, uint32_t numArgs);
+static binder_status_t (*AParcel_readStatusHeader)(const AParcel *parcel, AStatus **status);
+static binder_status_t (*AParcel_readBool)(const AParcel *parcel, bool *value);
+static void (*AParcel_delete)(AParcel *parcel);
+static binder_status_t (*AParcel_setDataPosition)(const AParcel *parcel, int32_t position);
+static int32_t (*AParcel_getDataPosition)(const AParcel *parcel);
+static binder_status_t (*AParcel_writeInt32)(AParcel *parcel, int32_t value);
+static binder_status_t (*AParcel_writeStringArray)(AParcel *parcel, const void *arrayData, int32_t length, AParcel_stringArrayElementGetter getter);
+static binder_status_t (*AParcel_writeString)(AParcel *parcel, const char *string, int32_t length);
+static bool (*AStatus_isOk)(const AStatus *status);
+static void (*AStatus_delete)(AStatus *status);
+static binder_exception_t (*AStatus_getExceptionCode)(const AStatus *status);
+static int32_t (*AStatus_getServiceSpecificError)(const AStatus *status);
+static const char* (*AStatus_getMessage)(const AStatus *status);
+static binder_status_t (*AStatus_getStatus)(const AStatus *status);
+static AIBinder *(*AServiceManager_getService)(const char *instance) __attribute__((__warn_unused_result__));
+
+static __attribute__((__constructor__(65535))) void load_symbols(void)
+{
+ void *handle = dlopen("libbinder_ndk.so", RTLD_LAZY);
+ binder_available = !!handle;
+ if (!binder_available)
+ return;
+
+#define X(symb) do { \
+ if (!((symb) = (typeof(symb))dlsym(handle, #symb))) { \
+ fprintf(stderr, "Error: unable to import " #symb " from libbinder_ndk.so\n"); \
+ exit(ELIBACC); \
+ } \
+ } while (0)
+ X(AIBinder_Class_define);
+ X(AIBinder_associateClass);
+ X(AIBinder_decStrong);
+ X(AIBinder_prepareTransaction);
+ X(AIBinder_transact);
+ X(AIBinder_ping);
+ X(AIBinder_dump);
+ X(AParcel_readStatusHeader);
+ X(AParcel_readBool);
+ X(AParcel_delete);
+ X(AParcel_setDataPosition);
+ X(AParcel_getDataPosition);
+ X(AParcel_writeInt32);
+ X(AParcel_writeStringArray);
+ X(AParcel_writeString);
+ X(AStatus_isOk);
+ X(AStatus_delete);
+ X(AStatus_getExceptionCode);
+ X(AStatus_getServiceSpecificError);
+ X(AStatus_getMessage);
+ X(AStatus_getStatus);
+ X(AServiceManager_getService);
+#undef X
+}
+
+static void cleanup_binder(AIBinder **binder)
+{
+ AIBinder_decStrong(*binder);
+}
+static void cleanup_status(AStatus **status)
+{
+ AStatus_delete(*status);
+}
+static void cleanup_parcel(AParcel **parcel)
+{
+ AParcel_delete(*parcel);
+}
+
+#define _cleanup_status_ __attribute__((__cleanup__(cleanup_status)))
+#define _cleanup_parcel_ __attribute__((__cleanup__(cleanup_parcel)))
+#define _cleanup_binder_ __attribute__((__cleanup__(cleanup_binder)))
+
+static int32_t string_size(const char *str)
+{
+ return str ? strlen(str) : -1;
+}
+
+static int32_t string_array_size(char *const *array)
+{
+ int32_t size = -1;
+ if (!array)
+ return size;
+ for (size = 0; array[size]; ++size);
+ return size;
+}
+
+static const char *string_array_getter(const void *array_data, size_t index, int32_t *outlength)
+{
+ const char **array = (const char **)array_data;
+ *outlength = array[index] ? strlen(array[index]) : -1;
+ return array[index];
+}
+
+static binder_status_t meaningful_binder_status(const AStatus *status_out)
+{
+ binder_status_t status = STATUS_OK;
+ binder_exception_t exc_code;
+ int32_t exc_code_service;
+ const char *message;
+
+ if (!AStatus_isOk(status_out)) {
+ exc_code = AStatus_getExceptionCode(status_out);
+ if (exc_code == EX_TRANSACTION_FAILED) {
+ status = AStatus_getStatus(status_out);
+ fprintf(stderr, "Error: transaction failed: %d\n", status);
+ }
+ else {
+ message = AStatus_getMessage(status_out);
+
+ if (exc_code == EX_SERVICE_SPECIFIC) {
+ exc_code_service = AStatus_getServiceSpecificError(status_out);
+ fprintf(stderr, "Error: service specific exception code: %d%s%s\n", exc_code_service, message ? ": " : "", message ?: "");
+ }
+ else
+ fprintf(stderr, "Error: exception code: %d%s%s\n", exc_code, message ? ": " : "", message ?: "");
+
+ status = STATUS_FAILED_TRANSACTION;
+ }
+ }
+
+ return status;
+}
+
+/* These values are default values observed in AOSP. */
+enum {
+ DNSRESOLVER_SAMPLE_VALIDITY = 1800 /* sec */,
+ DNSRESOLVER_SUCCESS_THRESHOLD = 25,
+ DNSRESOLVER_MIN_SAMPLES = 8,
+ DNSRESOLVER_MAX_SAMPLES = 8,
+ DNSRESOLVER_BASE_TIMEOUT = 5000 /* msec */,
+ DNSRESOLVER_RETRY_COUNT = 2
+};
+
+struct dnsresolver_params {
+ int32_t netid;
+ int32_t sample_validity_seconds;
+ int32_t success_threshold;
+ int32_t min_samples;
+ int32_t max_samples;
+ int32_t base_timeout_msec;
+ int32_t retry_count;
+ char **servers; /* NULL terminated array of zero-terminated UTF-8 strings */
+ char **domains; /* NULL terminated array of zero-terminated UTF-8 strings */
+ char *tls_name; /* zero-terminated UTF-8 string */
+ char **tls_servers; /* NULL terminated array of zero-terminated UTF-8 strings */
+ char **tls_fingerprints; /* NULL terminated array of zero-terminated UTF-8 strings */
+};
+
+static void *on_create()
+{
+ fprintf(stderr, "Error: on_create called on proxy object\n");
+ exit(ENOTSUP);
+ return NULL;
+}
+
+static void on_destroy()
+{
+ fprintf(stderr, "Error: on_destroy called on proxy object\n");
+ exit(ENOTSUP);
+}
+
+static binder_status_t on_transact()
+{
+ fprintf(stderr, "Error: on_transact called on a proxy object\n");
+ exit(ENOTSUP);
+ return 0;
+}
+
+static AIBinder *dnsresolver_get_handle(void)
+{
+ AIBinder *binder;
+ AIBinder_Class *clazz;
+
+ if (!binder_available)
+ return NULL;
+
+ binder = AServiceManager_getService("dnsresolver");
+ if (!binder)
+ return NULL;
+ clazz = AIBinder_Class_define("android.net.IDnsResolver", &on_create, &on_destroy, &on_transact);
+ if (!clazz)
+ goto error;
+
+ if (!AIBinder_associateClass(binder, clazz))
+ goto error;
+
+ return binder;
+error:
+ AIBinder_decStrong(binder);
+ return NULL;
+}
+
+static int32_t dnsresolver_create_network_cache(void *handle, int32_t netid)
+{
+ AIBinder *const binder = handle;
+ binder_status_t status;
+ _cleanup_parcel_ AParcel *parcel_in = NULL;
+ _cleanup_parcel_ AParcel *parcel_out = NULL;
+ _cleanup_status_ AStatus *status_out = NULL;
+
+ status = AIBinder_prepareTransaction(binder, &parcel_in);
+ if (status != STATUS_OK)
+ return status;
+
+ status = AParcel_writeInt32(parcel_in, netid);
+ if (status != STATUS_OK)
+ return status;
+
+ status = AIBinder_transact(binder, FIRST_CALL_TRANSACTION + 7 /* createNetworkCache */, &parcel_in, &parcel_out, 0);
+ if (status != STATUS_OK)
+ return status;
+
+ status = AParcel_readStatusHeader(parcel_out, &status_out);
+ if (status != STATUS_OK)
+ return status;
+
+ if (!AStatus_isOk(status_out))
+ return meaningful_binder_status(status_out);
+
+ return STATUS_OK;
+}
+
+static int32_t dnsresolver_set_resolver_configuration(void *handle, const struct dnsresolver_params *params)
+{
+ AIBinder *const binder = handle;
+ binder_status_t status;
+ _cleanup_parcel_ AParcel *parcel_in = NULL;
+ _cleanup_parcel_ AParcel *parcel_out = NULL;
+ _cleanup_status_ AStatus *status_out = NULL;
+ int32_t start_position, end_position;
+
+ status = AIBinder_prepareTransaction(binder, &parcel_in);
+ if (status != STATUS_OK)
+ return status;
+
+ status = AParcel_writeInt32(parcel_in, 1);
+ if (status != STATUS_OK)
+ return status;
+
+ start_position = AParcel_getDataPosition(parcel_in);
+ status = AParcel_writeInt32(parcel_in, 0);
+ if (status != STATUS_OK)
+ return status;
+
+ status = AParcel_writeInt32(parcel_in, params->netid);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->sample_validity_seconds);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->success_threshold);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->min_samples);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->max_samples);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->base_timeout_msec);
+ if (status != STATUS_OK)
+ return status;
+ status = AParcel_writeInt32(parcel_in, params->retry_count);
+ 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[])
{
char *args[argc + 4];
@@ -440,22 +809,75 @@ static void set_dnses(unsigned int netid, const char *dnses)
if (len > (1<<16))
return;
_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 **dns_list = NULL;
+ _cleanup_binder_ AIBinder *handle = NULL;
+ size_t dns_list_size = 0;
if (!len)
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")) {
if (strchr(dns, '\'') || strchr(dns, '\\'))
continue;
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;
- cndc("resolver setnetdns %u '' %s", netid, arglist);
+
+ if ((handle = dnsresolver_get_handle())) {
+ 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, &params);
+
+ 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)
@@ -662,8 +1084,8 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
add_if(iface);
set_config(iface, config);
listen_port = determine_listen_port(iface);
- set_addr(iface, addrs);
up_if(&netid, iface, listen_port);
+ set_addr(iface, addrs);
set_dnses(netid, dnses);
set_routes(iface, netid);
set_mtu(iface, mtu);