init: service file keyword am: 62767fe29f am: cc46af0fc9

am: 3b23d2864f

Change-Id: I0bd95c3fe9112b5b66a1f43b6bc52f570fd459d1

init/Android.mk

@@ -46,6 +46,7 @@ LOCAL_CPPFLAGS := $(init_cflags)
 LOCAL_SRC_FILES:= \
     action.cpp \
     capabilities.cpp \
+    descriptors.cpp \
     import_parser.cpp \
     init_parser.cpp \
     log.cpp \
@@ -125,8 +126,10 @@ LOCAL_SRC_FILES := \
 LOCAL_SHARED_LIBRARIES += \
     libcutils \
     libbase \
+    libselinux \
 
 LOCAL_STATIC_LIBRARIES := libinit
 LOCAL_SANITIZE := integer
 LOCAL_CLANG := true
+LOCAL_CPPFLAGS := -Wall -Wextra -Werror
 include $(BUILD_NATIVE_TEST)

init/descriptors.cpp

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2016 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 "descriptors.h"
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <android-base/stringprintf.h>
+#include <cutils/files.h>
+#include <cutils/sockets.h>
+
+#include "init.h"
+#include "log.h"
+#include "util.h"
+
+DescriptorInfo::DescriptorInfo(const std::string& name, const std::string& type, uid_t uid,
+                               gid_t gid, int perm, const std::string& context)
+        : name_(name), type_(type), uid_(uid), gid_(gid), perm_(perm), context_(context) {
+}
+
+DescriptorInfo::~DescriptorInfo() {
+}
+
+std::ostream& operator<<(std::ostream& os, const DescriptorInfo& info) {
+  return os << "  descriptors " << info.name_ << " " << info.type_ << " " << std::oct << info.perm_;
+}
+
+bool DescriptorInfo::operator==(const DescriptorInfo& other) const {
+  return name_ == other.name_ && type_ == other.type_ && key() == other.key();
+}
+
+void DescriptorInfo::CreateAndPublish(const std::string& globalContext) const {
+  // Create
+  const std::string& contextStr = context_.empty() ? globalContext : context_;
+  int fd = Create(contextStr);
+  if (fd < 0) return;
+
+  // Publish
+  std::string publishedName = key() + name_;
+  std::for_each(publishedName.begin(), publishedName.end(),
+                [] (char& c) { c = isalnum(c) ? c : '_'; });
+
+  std::string val = android::base::StringPrintf("%d", fd);
+  add_environment(publishedName.c_str(), val.c_str());
+
+  // make sure we don't close on exec
+  fcntl(fd, F_SETFD, 0);
+}
+
+void DescriptorInfo::Clean() const {
+}
+
+SocketInfo::SocketInfo(const std::string& name, const std::string& type, uid_t uid,
+                       gid_t gid, int perm, const std::string& context)
+        : DescriptorInfo(name, type, uid, gid, perm, context) {
+}
+
+void SocketInfo::Clean() const {
+  unlink(android::base::StringPrintf(ANDROID_SOCKET_DIR "/%s", name().c_str()).c_str());
+}
+
+int SocketInfo::Create(const std::string& context) const {
+  int flags = ((type() == "stream" ? SOCK_STREAM :
+                (type() == "dgram" ? SOCK_DGRAM :
+                 SOCK_SEQPACKET)));
+  return create_socket(name().c_str(), flags, perm(), uid(), gid(), context.c_str());
+}
+
+const std::string SocketInfo::key() const {
+  return ANDROID_SOCKET_ENV_PREFIX;
+}
+
+FileInfo::FileInfo(const std::string& name, const std::string& type, uid_t uid,
+                   gid_t gid, int perm, const std::string& context)
+        : DescriptorInfo(name, type, uid, gid, perm, context) {
+}
+
+int FileInfo::Create(const std::string& context) const {
+  int flags = ((type() == "r" ? O_RDONLY :
+                (type() == "w" ? (O_WRONLY | O_CREAT) :
+                 (O_RDWR | O_CREAT))));
+  return create_file(name().c_str(), flags, perm(), uid(), gid(), context.c_str());
+}
+
+const std::string FileInfo::key() const {
+  return ANDROID_FILE_ENV_PREFIX;
+}

init/descriptors.h

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+
+#ifndef _INIT_DESCRIPTORS_H
+#define _INIT_DESCRIPTORS_H
+
+#include <sys/types.h>
+
+#include <string>
+
+class DescriptorInfo {
+ public:
+  DescriptorInfo(const std::string& name, const std::string& type, uid_t uid,
+                 gid_t gid, int perm, const std::string& context);
+  virtual ~DescriptorInfo();
+
+  friend std::ostream& operator<<(std::ostream& os, const class DescriptorInfo& info);
+  bool operator==(const DescriptorInfo& other) const;
+
+  void CreateAndPublish(const std::string& globalContext) const;
+  virtual void Clean() const;
+
+ protected:
+  const std::string& name() const { return name_; }
+  const std::string& type() const { return type_; }
+  uid_t uid() const { return uid_; }
+  gid_t gid() const { return gid_; }
+  int perm() const { return perm_; }
+  const std::string& context() const { return context_; }
+
+ private:
+  std::string name_;
+  std::string type_;
+  uid_t uid_;
+  gid_t gid_;
+  int perm_;
+  std::string context_;
+
+  virtual int Create(const std::string& globalContext) const = 0;
+  virtual const std::string key() const = 0;
+};
+
+std::ostream& operator<<(std::ostream& os, const DescriptorInfo& info);
+
+class SocketInfo : public DescriptorInfo {
+ public:
+  SocketInfo(const std::string& name, const std::string& type, uid_t uid,
+             gid_t gid, int perm, const std::string& context);
+  void Clean() const override;
+ private:
+  virtual int Create(const std::string& context) const override;
+  virtual const std::string key() const override;
+};
+
+class FileInfo : public DescriptorInfo {
+ public:
+  FileInfo(const std::string& name, const std::string& type, uid_t uid,
+           gid_t gid, int perm, const std::string& context);
+ private:
+  virtual int Create(const std::string& context) const override;
+  virtual const std::string key() const override;
+};
+
+#endif

init/readme.txt

@@ -141,12 +141,20 @@ setenv <name> <value>
   Set the environment variable <name> to <value> in the launched process.
 
 socket <name> <type> <perm> [ <user> [ <group> [ <seclabel> ] ] ]
-  Create a unix domain socket named /dev/socket/<name> and pass
+  Create a unix domain socket named /dev/socket/<name> and pass its fd to the
-  its fd to the launched process.  <type> must be "dgram", "stream" or "seqpacket".
+  launched process.  <type> must be "dgram", "stream" or "seqpacket".  User and
-  User and group default to 0.
+  group default to 0.  'seclabel' is the SELinux security context for the
-  'seclabel' is the SELinux security context for the socket.
+  socket.  It defaults to the service security context, as specified by
-  It defaults to the service security context, as specified by seclabel or
+  seclabel or computed based on the service executable file security context.
-  computed based on the service executable file security context.
+  For native executables see libcutils android_get_control_socket().
+
+file <path> <type> <perm> [ <user> [ <group> [ <seclabel> ] ] ]
+  Open/Create a file path and pass its fd to the launched process.  <type> must
+  be "r", "w" or "rw".  User and group default to 0.  'seclabel' is the SELinux
+  security context for the file if it must be created.  It defaults to the
+  service security context, as specified by seclabel or computed based on the
+  service executable file security context.  For native executables see
+  libcutils android_get_control_file().
 
 user <username>
   Change to 'username' before exec'ing this service.

init/service.cpp

@@ -36,7 +36,6 @@
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <cutils/android_reboot.h>
-#include <cutils/sockets.h>
 #include <system/thread_defs.h>
 
 #include <processgroup/processgroup.h>
@@ -145,14 +144,6 @@ static void ExpandArgs(const std::vector<std::string>& args, std::vector<char*>*
     strs->push_back(nullptr);
 }
 
-SocketInfo::SocketInfo() : uid(0), gid(0), perm(0) {
-}
-
-SocketInfo::SocketInfo(const std::string& name, const std::string& type, uid_t uid,
-                       gid_t gid, int perm, const std::string& socketcon)
-    : name(name), type(type), uid(uid), gid(gid), perm(perm), socketcon(socketcon) {
-}
-
 ServiceEnvironmentInfo::ServiceEnvironmentInfo() {
 }
 
@@ -213,20 +204,6 @@ void Service::KillProcessGroup(int signal) {
     }
 }
 
-void Service::CreateSockets(const std::string& context) {
-    for (const auto& si : sockets_) {
-        int socket_type = ((si.type == "stream" ? SOCK_STREAM :
-                            (si.type == "dgram" ? SOCK_DGRAM :
-                             SOCK_SEQPACKET)));
-        const char* socketcon = !si.socketcon.empty() ? si.socketcon.c_str() : context.c_str();
-
-        int s = create_socket(si.name.c_str(), socket_type, si.perm, si.uid, si.gid, socketcon);
-        if (s >= 0) {
-            PublishSocket(si.name, s);
-        }
-    }
-}
-
 void Service::SetProcessAttributes() {
     // Keep capabilites on uid change.
     if (capabilities_.any() && uid_) {
@@ -273,11 +250,9 @@ bool Service::Reap() {
         KillProcessGroup(SIGKILL);
     }
 
-    // Remove any sockets we may have created.
+    // Remove any descriptor resources we may have created.
-    for (const auto& si : sockets_) {
+    std::for_each(descriptors_.begin(), descriptors_.end(),
-        std::string tmp = StringPrintf(ANDROID_SOCKET_DIR "/%s", si.name.c_str());
+                  std::bind(&DescriptorInfo::Clean, std::placeholders::_1));
-        unlink(tmp.c_str());
-    }
 
     if (flags_ & SVC_EXEC) {
         LOG(INFO) << "SVC_EXEC pid " << pid_ << " finished...";
@@ -330,9 +305,8 @@ void Service::DumpState() const {
     LOG(INFO) << "service " << name_;
     LOG(INFO) << "  class '" << classname_ << "'";
     LOG(INFO) << "  exec "<< android::base::Join(args_, " ");
-    for (const auto& si : sockets_) {
+    std::for_each(descriptors_.begin(), descriptors_.end(),
-        LOG(INFO) << "  socket " << si.name << " " << si.type << " " << std::oct << si.perm;
+                  [] (const auto& info) { LOG(INFO) << *info; });
-    }
 }
 
 bool Service::ParseCapabilities(const std::vector<std::string>& args, std::string* err) {
@@ -469,20 +443,48 @@ bool Service::ParseSetenv(const std::vector<std::string>& args, std::string* err
     return true;
 }
 
-/* name type perm [ uid gid context ] */
+template <typename T>
+bool Service::AddDescriptor(const std::vector<std::string>& args, std::string* err) {
+    int perm = args.size() > 3 ? std::strtoul(args[3].c_str(), 0, 8) : -1;
+    uid_t uid = args.size() > 4 ? decode_uid(args[4].c_str()) : 0;
+    gid_t gid = args.size() > 5 ? decode_uid(args[5].c_str()) : 0;
+    std::string context = args.size() > 6 ? args[6] : "";
+
+    auto descriptor = std::make_unique<T>(args[1], args[2], uid, gid, perm, context);
+
+    auto old =
+        std::find_if(descriptors_.begin(), descriptors_.end(),
+                     [&descriptor] (const auto& other) { return descriptor.get() == other.get(); });
+
+    if (old != descriptors_.end()) {
+        *err = "duplicate descriptor " + args[1] + " " + args[2];
+        return false;
+    }
+
+    descriptors_.emplace_back(std::move(descriptor));
+    return true;
+}
+
+// name type perm [ uid gid context ]
 bool Service::ParseSocket(const std::vector<std::string>& args, std::string* err) {
     if (args[2] != "dgram" && args[2] != "stream" && args[2] != "seqpacket") {
         *err = "socket type must be 'dgram', 'stream' or 'seqpacket'";
         return false;
     }
+    return AddDescriptor<SocketInfo>(args, err);
+}
 
-    int perm = std::strtoul(args[3].c_str(), 0, 8);
+// name type perm [ uid gid context ]
-    uid_t uid = args.size() > 4 ? decode_uid(args[4].c_str()) : 0;
+bool Service::ParseFile(const std::vector<std::string>& args, std::string* err) {
-    gid_t gid = args.size() > 5 ? decode_uid(args[5].c_str()) : 0;
+    if (args[2] != "r" && args[2] != "w" && args[2] != "rw") {
-    std::string socketcon = args.size() > 6 ? args[6] : "";
+        *err = "file type must be 'r', 'w' or 'rw'";
-
+        return false;
-    sockets_.emplace_back(args[1], args[2], uid, gid, perm, socketcon);
+    }
-    return true;
+    if ((args[1][0] != '/') || (args[1].find("../") != std::string::npos)) {
+        *err = "file name must not be relative";
+        return false;
+    }
+    return AddDescriptor<FileInfo>(args, err);
 }
 
 bool Service::ParseUser(const std::vector<std::string>& args, std::string* err) {
@@ -524,6 +526,7 @@ Service::OptionParserMap::Map& Service::OptionParserMap::map() const {
         {"seclabel",    {1,     1,    &Service::ParseSeclabel}},
         {"setenv",      {2,     2,    &Service::ParseSetenv}},
         {"socket",      {3,     6,    &Service::ParseSocket}},
+        {"file",        {2,     6,    &Service::ParseFile}},
         {"user",        {1,     1,    &Service::ParseUser}},
         {"writepid",    {1,     kMax, &Service::ParseWritepid}},
     };
@@ -613,7 +616,8 @@ bool Service::Start() {
             add_environment(ei.name.c_str(), ei.value.c_str());
         }
 
-        CreateSockets(scon);
+        std::for_each(descriptors_.begin(), descriptors_.end(),
+                      std::bind(&DescriptorInfo::CreateAndPublish, std::placeholders::_1, scon));
 
         std::string pid_str = StringPrintf("%d", getpid());
         for (const auto& file : writepid_files_) {
@@ -787,15 +791,6 @@ void Service::OpenConsole() const {
     close(fd);
 }
 
-void Service::PublishSocket(const std::string& name, int fd) const {
-    std::string key = StringPrintf(ANDROID_SOCKET_ENV_PREFIX "%s", name.c_str());
-    std::string val = StringPrintf("%d", fd);
-    add_environment(key.c_str(), val.c_str());
-
-    /* make sure we don't close-on-exec */
-    fcntl(fd, F_SETFD, 0);
-}
-
 int ServiceManager::exec_count_ = 0;
 
 ServiceManager::ServiceManager() {

init/service.h

@@ -27,6 +27,7 @@
 
 #include "action.h"
 #include "capabilities.h"
+#include "descriptors.h"
 #include "init_parser.h"
 #include "keyword_map.h"
 
@@ -48,18 +49,6 @@
 class Action;
 class ServiceManager;
 
-struct SocketInfo {
-    SocketInfo();
-    SocketInfo(const std::string& name, const std::string& type, uid_t uid,
-                       gid_t gid, int perm, const std::string& socketcon);
-    std::string name;
-    std::string type;
-    uid_t uid;
-    gid_t gid;
-    int perm;
-    std::string socketcon;
-};
-
 struct ServiceEnvironmentInfo {
     ServiceEnvironmentInfo();
     ServiceEnvironmentInfo(const std::string& name, const std::string& value);
@@ -113,9 +102,7 @@ private:
     void StopOrReset(int how);
     void ZapStdio() const;
     void OpenConsole() const;
-    void PublishSocket(const std::string& name, int fd) const;
     void KillProcessGroup(int signal);
-    void CreateSockets(const std::string& scon);
     void SetProcessAttributes();
 
     bool ParseCapabilities(const std::vector<std::string>& args, std::string *err);
@@ -134,9 +121,13 @@ private:
     bool ParseSeclabel(const std::vector<std::string>& args, std::string* err);
     bool ParseSetenv(const std::vector<std::string>& args, std::string* err);
     bool ParseSocket(const std::vector<std::string>& args, std::string* err);
+    bool ParseFile(const std::vector<std::string>& args, std::string* err);
     bool ParseUser(const std::vector<std::string>& args, std::string* err);
     bool ParseWritepid(const std::vector<std::string>& args, std::string* err);
 
+    template <typename T>
+    bool AddDescriptor(const std::vector<std::string>& args, std::string* err);
+
     std::string name_;
     std::string classname_;
     std::string console_;
@@ -155,7 +146,7 @@ private:
 
     std::string seclabel_;
 
-    std::vector<SocketInfo> sockets_;
+    std::vector<std::unique_ptr<DescriptorInfo>> descriptors_;
     std::vector<ServiceEnvironmentInfo> envvars_;
 
     Action onrestart_;  // Commands to execute on restart.

init/util.cpp

@@ -14,32 +14,32 @@
  * limitations under the License.
  */
 
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <ftw.h>
+#include <pwd.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <errno.h>
 #include <time.h>
-#include <ftw.h>
+#include <unistd.h>
-#include <pwd.h>
 
-#include <selinux/label.h>
 #include <selinux/android.h>
+#include <selinux/label.h>
 
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <sys/socket.h>
 #include <sys/un.h>
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/stringprintf.h>
 #include <android-base/strings.h>
-
 /* for ANDROID_SOCKET_* */
 #include <cutils/sockets.h>
-#include <android-base/stringprintf.h>
 
 #include "init.h"
 #include "log.h"
@@ -164,6 +164,76 @@ out_close:
     return -1;
 }
 
+/*
+ * create_file - opens and creates a file as dictated in init.rc.
+ * This file is inherited by the daemon. We communicate the file
+ * descriptor's value via the environment variable ANDROID_FILE_<basename>
+ */
+int create_file(const char *path, int flags, mode_t perm, uid_t uid,
+                  gid_t gid, const char *filecon)
+{
+    char *secontext = NULL;
+    int ret;
+
+    if (filecon) {
+        if (setsockcreatecon(filecon) == -1) {
+            PLOG(ERROR) << "setsockcreatecon(\"" << filecon << "\") failed";
+            return -1;
+        }
+    } else if (sehandle) {
+        ret = selabel_lookup(sehandle, &secontext, path, perm);
+        if (ret != -1) {
+            ret = setfscreatecon(secontext);
+            if (ret == -1) {
+                freecon(secontext);
+                PLOG(ERROR) << "setfscreatecon(\"" << secontext << "\") failed";
+                return -1;
+            }
+        }
+    }
+
+    int fd = TEMP_FAILURE_RETRY(open(path, flags | O_NDELAY, perm));
+
+    if (filecon) {
+        setsockcreatecon(NULL);
+        lsetfilecon(path, filecon);
+    } else {
+        setfscreatecon(NULL);
+        freecon(secontext);
+    }
+
+    if (fd == -1) {
+        PLOG(ERROR) << "Failed to open/create file '" << path << "'";
+        goto out_close;
+    }
+
+    if (!(flags & O_NDELAY)) fcntl(fd, F_SETFD, flags);
+
+    ret = lchown(path, uid, gid);
+    if (ret) {
+        PLOG(ERROR) << "Failed to lchown file '" << path << "'";
+        goto out_close;
+    }
+    if (perm != static_cast<mode_t>(-1)) {
+        ret = fchmodat(AT_FDCWD, path, perm, AT_SYMLINK_NOFOLLOW);
+        if (ret) {
+            PLOG(ERROR) << "Failed to fchmodat file '" << path << "'";
+            goto out_close;
+        }
+    }
+
+    LOG(INFO) << "Created file '" << path << "'"
+              << ", mode " << std::oct << perm << std::dec
+              << ", user " << uid
+              << ", group " << gid;
+
+    return fd;
+
+out_close:
+    if (fd >= 0) close(fd);
+    return -1;
+}
+
 bool read_file(const char* path, std::string* content) {
     content->clear();
 

init/util.h

@@ -27,6 +27,8 @@
 
 int create_socket(const char *name, int type, mode_t perm,
                   uid_t uid, gid_t gid, const char *socketcon);
+int create_file(const char *path, int mode, mode_t perm,
+                uid_t uid, gid_t gid, const char *filecon);
 
 bool read_file(const char* path, std::string* content);
 int write_file(const char* path, const char* content);

init/util_test.cpp

@@ -17,7 +17,15 @@
 #include "util.h"
 
 #include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <cutils/files.h>
 #include <gtest/gtest.h>
+#include <selinux/android.h>
 
 TEST(util, read_file_ENOENT) {
   std::string s("hello");
@@ -41,3 +49,51 @@ TEST(util, decode_uid) {
   EXPECT_EQ(UINT_MAX, decode_uid("toot"));
   EXPECT_EQ(123U, decode_uid("123"));
 }
+
+struct selabel_handle *sehandle;
+
+TEST(util, create_file) {
+  if (!sehandle) sehandle = selinux_android_file_context_handle();
+
+  static const char path[] = "/data/local/tmp/util.create_file.test";
+  static const char key[] = ANDROID_FILE_ENV_PREFIX "_data_local_tmp_util_create_file_test";
+  EXPECT_EQ(unsetenv(key), 0);
+  unlink(path);
+
+  int fd;
+  uid_t uid = decode_uid("logd");
+  gid_t gid = decode_uid("system");
+  mode_t perms = S_IRWXU | S_IWGRP | S_IRGRP | S_IROTH;
+  static const char context[] = "u:object_r:misc_logd_file:s0";
+  EXPECT_GE(fd = create_file(path, O_RDWR | O_CREAT, perms, uid, gid, context), 0);
+  if (fd < 0) return;
+  static const char hello[] = "hello world\n";
+  static const ssize_t len = strlen(hello);
+  EXPECT_EQ(write(fd, hello, len), len);
+  char buffer[sizeof(hello)];
+  memset(buffer, 0, sizeof(buffer));
+  EXPECT_GE(lseek(fd, 0, SEEK_SET), 0);
+  EXPECT_EQ(read(fd, buffer, sizeof(buffer)), len);
+  EXPECT_EQ(strcmp(hello, buffer), 0);
+  char val[32];
+  snprintf(val, sizeof(val), "%d", fd);
+  EXPECT_EQ(android_get_control_file(path), -1);
+  setenv(key, val, true);
+  EXPECT_EQ(android_get_control_file(path), fd);
+  close(fd);
+  EXPECT_EQ(android_get_control_file(path), -1);
+  EXPECT_EQ(unsetenv(key), 0);
+  struct stat st;
+  EXPECT_EQ(stat(path, &st), 0);
+  EXPECT_EQ(st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO), perms);
+  EXPECT_EQ(st.st_uid, uid);
+  EXPECT_EQ(st.st_gid, gid);
+  security_context_t con;
+  EXPECT_GE(getfilecon(path, &con), 0);
+  EXPECT_NE(con, static_cast<security_context_t>(NULL));
+  if (con) {
+    EXPECT_EQ(context, std::string(con));
+  }
+  freecon(con);
+  EXPECT_EQ(unlink(path), 0);
+}