| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | timezone.c |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file contains methods for configuring the timezone. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #include "common.h" |
| 16 | #include "util.h" |
| 17 | #include "WslDistributionConfig.h" |
| 18 | |
| 19 | #define TIMEZONE_LOCALTIME_FILE ETC_FOLDER "localtime" |
| 20 | #define TIMEZONE_SETTING_FILE ETC_FOLDER "timezone" |
| 21 | |
| 22 | void UpdateTimezone(std::string_view Timezone, const wsl::linux::WslDistributionConfig& Config) |
| 23 | |
| 24 | /*++ |
| 25 | |
| 26 | Routine Description: |
| 27 | |
| 28 | This routine updates the instance's timezone information by creating the |
| 29 | /etc/localtime symlink and writing /etc/timezone. |
| 30 | |
| 31 | Arguments: |
| 32 | |
| 33 | Timezone - Supplies the Linux timezone. |
| 34 | |
| 35 | Config - Supplies the distribution configuration. |
| 36 | |
| 37 | Return Value: |
| 38 | |
| 39 | None. |
| 40 | |
| 41 | --*/ |
| 42 | |
| 43 | try |
| 44 | { |
| 45 | // |
| 46 | // If automatic timezone translation is disabled, do nothing. |
| 47 | // |
| 48 | |
| 49 | if (!Config.AutoUpdateTimezone) |
| 50 | { |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | if (Timezone.empty()) |
| 55 | { |
| 56 | LOG_WARNING("Windows to Linux timezone mapping was not possible."); |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | // |
| 61 | // Construct the /etc/localtime symlink target and ensure it will exist. |
| 62 | // |
| 63 | |
| 64 | std::string Target{"/usr/share/zoneinfo/"}; |
| 65 | Target += Timezone; |
| 66 | if (access(Target.c_str(), F_OK) < 0) |
| 67 | { |
| 68 | LOG_WARNING("{} not found. Is the tzdata package installed?", Target.c_str()); |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | // |
| 73 | // Update the /etc/localtime symlink. |
| 74 | // |
| 75 | |
| 76 | if ((unlink(TIMEZONE_LOCALTIME_FILE) < 0) && (errno != ENOENT)) |
| 77 | { |
| 78 | LOG_ERROR("unlink failed {}", errno); |
| 79 | return; |
| 80 | } |
| 81 | |
| 82 | if (symlink(Target.c_str(), TIMEZONE_LOCALTIME_FILE) < 0) |
| 83 | { |
| 84 | LOG_ERROR("symlink failed {}", errno); |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | // |
| 89 | // Write the contents of /etc/timezone to contain the IANA identifier. |
| 90 | // |
| 91 | |
| 92 | wil::unique_fd TimezoneFile{TEMP_FAILURE_RETRY(open(TIMEZONE_SETTING_FILE, (O_CREAT | O_TRUNC | O_RDWR), 0644))}; |
| 93 | |
| 94 | if (!TimezoneFile) |
| 95 | { |
| 96 | LOG_ERROR("open({}) failed {}", TIMEZONE_SETTING_FILE, errno); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | std::string FileContents(Timezone); |
| 101 | FileContents += '\n'; |
| 102 | if (UtilWriteStringView(TimezoneFile.get(), FileContents) < 0) |
| 103 | { |
| 104 | LOG_ERROR("write failed {}", errno); |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | return; |
| 109 | } |
| 110 | CATCH_LOG() |
| 111 | |
| 112 | void UpdateTimezone(gsl::span<gsl::byte> Buffer, const wsl::linux::WslDistributionConfig& Config) |
| 113 | |
| 114 | /*++ |
| 115 | |
| 116 | Routine Description: |
| 117 | |
| 118 | This routine processes an update timezone message. |
| 119 | |
| 120 | Arguments: |
| 121 | |
| 122 | Buffer - Supplies the message. |
| 123 | |
| 124 | Config - Supplies the distribution configuration. |
| 125 | |
| 126 | |
| 127 | Return Value: |
| 128 | |
| 129 | None. |
| 130 | |
| 131 | --*/ |
| 132 | |
| 133 | { |
| 134 | auto* TimezoneInfo = gslhelpers::try_get_struct<const LX_INIT_TIMEZONE_INFORMATION>(Buffer); |
| 135 | if (!TimezoneInfo) |
| 136 | { |
| 137 | LOG_ERROR("Unexpected message size {}", Buffer.size()); |
| 138 | return; |
| 139 | } |
| 140 | |
| 141 | UpdateTimezone(wsl::shared::string::FromSpan(Buffer, TimezoneInfo->TimezoneOffset), Config); |
| 142 | } |