Ken Mixter | 0340316 | 2010-08-18 15:23:16 -0700 | [diff] [blame] | 1 | // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "crash-reporter/crash_collector.h" |
| 6 | |
Ken Mixter | 04ec10f | 2010-08-26 16:02:02 -0700 | [diff] [blame^] | 7 | #include <dirent.h> |
Ken Mixter | 0340316 | 2010-08-18 15:23:16 -0700 | [diff] [blame] | 8 | #include <pwd.h> // For struct passwd. |
| 9 | #include <sys/types.h> // for mode_t. |
| 10 | |
| 11 | #include "base/file_util.h" |
| 12 | #include "base/logging.h" |
| 13 | #include "base/string_util.h" |
| 14 | #include "crash-reporter/system_logging.h" |
| 15 | |
| 16 | static const char kDefaultUserName[] = "chronos"; |
| 17 | static const char kSystemCrashPath[] = "/var/spool/crash"; |
| 18 | static const char kUserCrashPath[] = "/home/chronos/user/crash"; |
| 19 | |
| 20 | // Directory mode of the user crash spool directory. |
| 21 | static const mode_t kUserCrashPathMode = 0755; |
| 22 | |
| 23 | // Directory mode of the system crash spool directory. |
| 24 | static const mode_t kSystemCrashPathMode = 01755; |
| 25 | |
| 26 | static const uid_t kRootOwner = 0; |
| 27 | static const uid_t kRootGroup = 0; |
| 28 | |
Ken Mixter | 04ec10f | 2010-08-26 16:02:02 -0700 | [diff] [blame^] | 29 | // Maximum of 8 crash reports per directory. |
| 30 | const int CrashCollector::kMaxCrashDirectorySize = 8; |
| 31 | |
Ken Mixter | 0340316 | 2010-08-18 15:23:16 -0700 | [diff] [blame] | 32 | CrashCollector::CrashCollector() : forced_crash_directory_(NULL) { |
| 33 | } |
| 34 | |
| 35 | CrashCollector::~CrashCollector() { |
| 36 | } |
| 37 | |
| 38 | void CrashCollector::Initialize( |
| 39 | CrashCollector::CountCrashFunction count_crash_function, |
| 40 | CrashCollector::IsFeedbackAllowedFunction is_feedback_allowed_function, |
| 41 | SystemLogging *logger) { |
| 42 | CHECK(count_crash_function != NULL); |
| 43 | CHECK(is_feedback_allowed_function != NULL); |
| 44 | CHECK(logger != NULL); |
| 45 | |
| 46 | count_crash_function_ = count_crash_function; |
| 47 | is_feedback_allowed_function_ = is_feedback_allowed_function; |
| 48 | logger_ = logger; |
| 49 | } |
| 50 | |
| 51 | std::string CrashCollector::FormatDumpBasename(const std::string &exec_name, |
| 52 | time_t timestamp, |
| 53 | pid_t pid) { |
| 54 | struct tm tm; |
| 55 | localtime_r(×tamp, &tm); |
| 56 | return StringPrintf("%s.%04d%02d%02d.%02d%02d%02d.%d", |
| 57 | exec_name.c_str(), |
| 58 | tm.tm_year + 1900, |
| 59 | tm.tm_mon + 1, |
| 60 | tm.tm_mday, |
| 61 | tm.tm_hour, |
| 62 | tm.tm_min, |
| 63 | tm.tm_sec, |
| 64 | pid); |
| 65 | } |
| 66 | |
| 67 | FilePath CrashCollector::GetCrashDirectoryInfo( |
| 68 | uid_t process_euid, |
| 69 | uid_t default_user_id, |
| 70 | gid_t default_user_group, |
| 71 | mode_t *mode, |
| 72 | uid_t *directory_owner, |
| 73 | gid_t *directory_group) { |
| 74 | if (process_euid == default_user_id) { |
| 75 | *mode = kUserCrashPathMode; |
| 76 | *directory_owner = default_user_id; |
| 77 | *directory_group = default_user_group; |
| 78 | return FilePath(kUserCrashPath); |
| 79 | } else { |
| 80 | *mode = kSystemCrashPathMode; |
| 81 | *directory_owner = kRootOwner; |
| 82 | *directory_group = kRootGroup; |
| 83 | return FilePath(kSystemCrashPath); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | bool CrashCollector::GetUserInfoFromName(const std::string &name, |
| 88 | uid_t *uid, |
| 89 | gid_t *gid) { |
| 90 | char storage[256]; |
| 91 | struct passwd passwd_storage; |
| 92 | struct passwd *passwd_result = NULL; |
| 93 | |
| 94 | if (getpwnam_r(name.c_str(), &passwd_storage, storage, sizeof(storage), |
| 95 | &passwd_result) != 0 || passwd_result == NULL) { |
| 96 | logger_->LogError("Cannot find user named %s", name.c_str()); |
| 97 | return false; |
| 98 | } |
| 99 | |
| 100 | *uid = passwd_result->pw_uid; |
| 101 | *gid = passwd_result->pw_gid; |
| 102 | return true; |
| 103 | } |
| 104 | |
| 105 | bool CrashCollector::GetCreatedCrashDirectoryByEuid(uid_t euid, |
| 106 | FilePath *crash_directory) { |
| 107 | uid_t default_user_id; |
| 108 | gid_t default_user_group; |
| 109 | |
| 110 | // For testing. |
| 111 | if (forced_crash_directory_ != NULL) { |
| 112 | *crash_directory = FilePath(forced_crash_directory_); |
| 113 | return true; |
| 114 | } |
| 115 | |
| 116 | if (!GetUserInfoFromName(kDefaultUserName, |
| 117 | &default_user_id, |
| 118 | &default_user_group)) { |
| 119 | logger_->LogError("Could not find default user info"); |
| 120 | return false; |
| 121 | } |
| 122 | mode_t directory_mode; |
| 123 | uid_t directory_owner; |
| 124 | gid_t directory_group; |
| 125 | *crash_directory = |
| 126 | GetCrashDirectoryInfo(euid, |
| 127 | default_user_id, |
| 128 | default_user_group, |
| 129 | &directory_mode, |
| 130 | &directory_owner, |
| 131 | &directory_group); |
| 132 | |
| 133 | if (!file_util::PathExists(*crash_directory)) { |
| 134 | // Create the spool directory with the appropriate mode (regardless of |
| 135 | // umask) and ownership. |
| 136 | mode_t old_mask = umask(0); |
| 137 | if (mkdir(crash_directory->value().c_str(), directory_mode) < 0 || |
| 138 | chown(crash_directory->value().c_str(), |
| 139 | directory_owner, |
| 140 | directory_group) < 0) { |
| 141 | logger_->LogError("Unable to create appropriate crash directory"); |
| 142 | return false; |
| 143 | } |
| 144 | umask(old_mask); |
| 145 | } |
| 146 | |
| 147 | if (!file_util::PathExists(*crash_directory)) { |
| 148 | logger_->LogError("Unable to create crash directory %s", |
| 149 | crash_directory->value().c_str()); |
| 150 | return false; |
| 151 | } |
| 152 | |
Ken Mixter | 04ec10f | 2010-08-26 16:02:02 -0700 | [diff] [blame^] | 153 | if (!CheckHasCapacity(*crash_directory)) { |
| 154 | return false; |
| 155 | } |
| 156 | |
Ken Mixter | 0340316 | 2010-08-18 15:23:16 -0700 | [diff] [blame] | 157 | return true; |
| 158 | } |
Ken Mixter | 04ec10f | 2010-08-26 16:02:02 -0700 | [diff] [blame^] | 159 | |
| 160 | // Return true if the given crash directory has not already reached |
| 161 | // maximum capacity. |
| 162 | bool CrashCollector::CheckHasCapacity(const FilePath &crash_directory) { |
| 163 | DIR* dir = opendir(crash_directory.value().c_str()); |
| 164 | if (!dir) { |
| 165 | return false; |
| 166 | } |
| 167 | struct dirent ent_buf; |
| 168 | struct dirent* ent; |
| 169 | int count_non_core = 0; |
| 170 | int count_core = 0; |
| 171 | bool full = false; |
| 172 | while (readdir_r(dir, &ent_buf, &ent) == 0 && ent != NULL) { |
| 173 | if ((strcmp(ent->d_name, ".") == 0) || |
| 174 | (strcmp(ent->d_name, "..") == 0)) |
| 175 | continue; |
| 176 | |
| 177 | if (strcmp(ent->d_name + strlen(ent->d_name) - 5, ".core") == 0) { |
| 178 | ++count_core; |
| 179 | } else { |
| 180 | ++count_non_core; |
| 181 | } |
| 182 | |
| 183 | if (count_core >= kMaxCrashDirectorySize || |
| 184 | count_non_core >= kMaxCrashDirectorySize) { |
| 185 | logger_->LogWarning( |
| 186 | "Crash directory %s already full with %d pending reports", |
| 187 | crash_directory.value().c_str(), |
| 188 | kMaxCrashDirectorySize); |
| 189 | full = true; |
| 190 | break; |
| 191 | } |
| 192 | } |
| 193 | closedir(dir); |
| 194 | return !full; |
| 195 | } |