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86 lines
2.9 KiB
86 lines
2.9 KiB
/* |
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* Copyright (C) 2015 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include "diagnose_usb.h" |
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#include <errno.h> |
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#include <unistd.h> |
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#include <string> |
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#include <android-base/stringprintf.h> |
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#if defined(__linux__) |
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#include <grp.h> |
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#include <pwd.h> |
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#endif |
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static const char kPermissionsHelpUrl[] = "http://developer.android.com/tools/device.html"; |
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// Returns a message describing any potential problems we find with udev, or an empty string if we |
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// can't find plugdev information (i.e. udev is not installed). |
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static std::string GetUdevProblem() { |
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#if defined(__linux__) |
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errno = 0; |
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group* plugdev_group = getgrnam("plugdev"); |
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if (plugdev_group == nullptr) { |
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if (errno != 0) { |
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perror("failed to read plugdev group info"); |
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} |
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// We can't give any generally useful advice here, just let the caller print the help URL. |
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return ""; |
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} |
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// getgroups(2) indicates that the GNU group_member(3) may not check the egid so we check it |
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// additionally just to be sure. |
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if (group_member(plugdev_group->gr_gid) || getegid() == plugdev_group->gr_gid) { |
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// The user is in plugdev so the problem is likely with the udev rules. |
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return "user in plugdev group; are your udev rules wrong?"; |
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} |
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passwd* pwd = getpwuid(getuid()); |
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return android::base::StringPrintf("user %s is not in the plugdev group", |
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pwd ? pwd->pw_name : "?"); |
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#else |
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return ""; |
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#endif |
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} |
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// Short help text must be a single line, and will look something like: |
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// |
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// no permissions (reason); see [URL] |
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std::string UsbNoPermissionsShortHelpText() { |
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std::string help_text = "no permissions"; |
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std::string problem(GetUdevProblem()); |
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if (!problem.empty()) help_text += " (" + problem + ")"; |
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return android::base::StringPrintf("%s; see [%s]", help_text.c_str(), kPermissionsHelpUrl); |
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} |
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// Long help text can span multiple lines but doesn't currently provide more detailed information: |
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// |
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// insufficient permissions for device: reason |
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// See [URL] for more information |
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std::string UsbNoPermissionsLongHelpText() { |
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std::string header = "insufficient permissions for device"; |
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std::string problem(GetUdevProblem()); |
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if (!problem.empty()) header += ": " + problem; |
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return android::base::StringPrintf("%s\nSee [%s] for more information", header.c_str(), |
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kPermissionsHelpUrl); |
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}
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