537 lines
12 KiB
C
537 lines
12 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* Time Zone
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*
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* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/wtypes.h>
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#include <winpr/timezone.h>
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#include <winpr/crt.h>
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#include <winpr/file.h>
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#include "../log.h"
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#define TAG WINPR_TAG("timezone")
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#ifndef _WIN32
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#include <time.h>
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#include <unistd.h>
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#include "TimeZones.h"
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#include "WindowsZones.h"
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static UINT64 winpr_windows_gmtime(void)
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{
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time_t unix_time;
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UINT64 windows_time;
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time(&unix_time);
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if (unix_time < 0)
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return 0;
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windows_time = (UINT64)unix_time;
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windows_time *= 10000000;
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windows_time += 621355968000000000ULL;
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return windows_time;
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}
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static char* winpr_read_unix_timezone_identifier_from_file(FILE* fp)
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{
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INT64 length;
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char* tzid = NULL;
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if (_fseeki64(fp, 0, SEEK_END) != 0)
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return NULL;
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length = _ftelli64(fp);
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if (_fseeki64(fp, 0, SEEK_SET) != 0)
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return NULL;
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if (length < 2)
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return NULL;
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tzid = (char*)malloc((size_t)length + 1);
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if (!tzid)
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return NULL;
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if (fread(tzid, (size_t)length, 1, fp) != 1)
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{
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free(tzid);
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return NULL;
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}
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tzid[length] = '\0';
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if (tzid[length - 1] == '\n')
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tzid[length - 1] = '\0';
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return tzid;
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}
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static char* winpr_get_timezone_from_link(void)
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{
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const char* links[] = { "/etc/localtime", "/etc/TZ" };
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size_t x;
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ssize_t len;
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char buf[1024];
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char* tzid = NULL;
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/*
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* On linux distros such as Redhat or Archlinux, a symlink at /etc/localtime
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* will point to /usr/share/zoneinfo/region/place where region/place could be
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* America/Montreal for example.
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* Some distributions do have to symlink at /etc/TZ.
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*/
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for (x = 0; x < sizeof(links) / sizeof(links[0]); x++)
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{
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const char* link = links[x];
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if ((len = readlink(link, buf, sizeof(buf) - 1)) != -1)
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{
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int num = 0;
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size_t alloc;
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SSIZE_T pos = len;
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buf[len] = '\0';
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/* find the position of the 2nd to last "/" */
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while (num < 2)
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{
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if (pos == 0)
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break;
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pos -= 1;
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if (buf[pos] == '/')
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num++;
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}
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if ((len < 0) || (pos < 0) || (pos > len))
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return NULL;
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alloc = (size_t)len - (size_t)pos;
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tzid = (char*)malloc(alloc + 1);
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if (!tzid)
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return NULL;
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strncpy(tzid, buf + pos + 1, alloc);
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return tzid;
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}
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}
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return NULL;
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}
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#if defined(ANDROID)
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#include <jni.h>
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static JavaVM* jniVm = NULL;
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JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved)
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{
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jniVm = vm;
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return JNI_VERSION_1_6;
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}
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static char* winpr_get_android_timezone_identifier(void)
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{
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char* tzid = NULL;
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JNIEnv* jniEnv;
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/* Preferred: Try to get identifier from java TimeZone class */
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if (jniVm && ((*jniVm)->GetEnv(jniVm, (void**)&jniEnv, JNI_VERSION_1_6) == JNI_OK))
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{
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const char* raw;
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jclass jObjClass;
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jobject jObj;
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jmethodID jDefaultTimezone;
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jmethodID jTimezoneIdentifier;
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jstring tzJId;
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jboolean attached = (*jniVm)->AttachCurrentThread(jniVm, &jniEnv, NULL);
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jObjClass = (*jniEnv)->FindClass(jniEnv, "java/util/TimeZone");
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if (!jObjClass)
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goto fail;
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jDefaultTimezone =
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(*jniEnv)->GetStaticMethodID(jniEnv, jObjClass, "getDefault", "()Ljava/util/TimeZone;");
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if (!jDefaultTimezone)
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goto fail;
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jObj = (*jniEnv)->CallStaticObjectMethod(jniEnv, jObjClass, jDefaultTimezone);
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if (!jObj)
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goto fail;
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jTimezoneIdentifier =
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(*jniEnv)->GetMethodID(jniEnv, jObjClass, "getID", "()Ljava/lang/String;");
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if (!jTimezoneIdentifier)
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goto fail;
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tzJId = (*jniEnv)->CallObjectMethod(jniEnv, jObj, jTimezoneIdentifier);
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if (!tzJId)
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goto fail;
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raw = (*jniEnv)->GetStringUTFChars(jniEnv, tzJId, 0);
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if (raw)
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tzid = _strdup(raw);
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(*jniEnv)->ReleaseStringUTFChars(jniEnv, tzJId, raw);
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fail:
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if (attached)
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(*jniVm)->DetachCurrentThread(jniVm);
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}
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/* Fall back to property, might not be available. */
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if (!tzid)
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{
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FILE* fp = popen("getprop persist.sys.timezone", "r");
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if (fp)
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{
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tzid = winpr_read_unix_timezone_identifier_from_file(fp);
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pclose(fp);
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}
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}
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return tzid;
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}
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#endif
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static char* winpr_get_unix_timezone_identifier_from_file(void)
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{
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#if defined(ANDROID)
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return winpr_get_android_timezone_identifier();
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#else
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FILE* fp;
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char* tzid = NULL;
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#if defined(__FreeBSD__) || defined(__OpenBSD__)
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fp = winpr_fopen("/var/db/zoneinfo", "r");
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#else
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fp = winpr_fopen("/etc/timezone", "r");
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#endif
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if (NULL == fp)
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return NULL;
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tzid = winpr_read_unix_timezone_identifier_from_file(fp);
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fclose(fp);
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return tzid;
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#endif
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}
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static BOOL winpr_match_unix_timezone_identifier_with_list(const char* tzid, const char* list)
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{
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char* p;
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char* list_copy;
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char* context = NULL;
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list_copy = _strdup(list);
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if (!list_copy)
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return FALSE;
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p = strtok_s(list_copy, " ", &context);
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while (p != NULL)
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{
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if (strcmp(p, tzid) == 0)
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{
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free(list_copy);
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return TRUE;
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}
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p = strtok_s(NULL, " ", &context);
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}
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free(list_copy);
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return FALSE;
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}
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static TIME_ZONE_ENTRY* winpr_detect_windows_time_zone(void)
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{
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size_t i, j;
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char* tzid;
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tzid = winpr_get_unix_timezone_identifier_from_file();
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if (tzid == NULL)
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tzid = winpr_get_timezone_from_link();
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if (tzid == NULL)
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return NULL;
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for (i = 0; i < TimeZoneTableNrElements; i++)
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{
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const TIME_ZONE_ENTRY* tze = &TimeZoneTable[i];
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for (j = 0; j < WindowsTimeZoneIdTableNrElements; j++)
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{
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const WINDOWS_TZID_ENTRY* wzid = &WindowsTimeZoneIdTable[j];
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if (strcmp(tze->Id, wzid->windows) != 0)
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continue;
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if (winpr_match_unix_timezone_identifier_with_list(tzid, wzid->tzid))
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{
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TIME_ZONE_ENTRY* timezone = (TIME_ZONE_ENTRY*)malloc(sizeof(TIME_ZONE_ENTRY));
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free(tzid);
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if (!timezone)
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return NULL;
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*timezone = TimeZoneTable[i];
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return timezone;
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}
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}
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}
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WLog_ERR(TAG, "Unable to find a match for unix timezone: %s", tzid);
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free(tzid);
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return NULL;
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}
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static const TIME_ZONE_RULE_ENTRY*
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winpr_get_current_time_zone_rule(const TIME_ZONE_RULE_ENTRY* rules, UINT32 count)
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{
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UINT32 i;
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UINT64 windows_time;
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windows_time = winpr_windows_gmtime();
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for (i = 0; i < count; i++)
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{
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if ((rules[i].TicksStart >= windows_time) && (windows_time >= rules[i].TicksEnd))
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{
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/*WLog_ERR(TAG, "Got rule %d from table at %p with count %"PRIu32"", i, (void*) rules,
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* count);*/
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return &rules[i];
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}
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}
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WLog_ERR(TAG, "Unable to get current timezone rule");
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return NULL;
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}
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DWORD GetTimeZoneInformation(LPTIME_ZONE_INFORMATION lpTimeZoneInformation)
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{
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time_t t;
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struct tm tres;
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struct tm* local_time;
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TIME_ZONE_ENTRY* dtz = NULL;
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LPTIME_ZONE_INFORMATION tz = lpTimeZoneInformation;
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lpTimeZoneInformation->StandardBias = 0;
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time(&t);
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local_time = localtime_r(&t, &tres);
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if (!local_time)
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goto out_error;
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memset(tz, 0, sizeof(TIME_ZONE_INFORMATION));
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#ifdef HAVE_TM_GMTOFF
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{
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long bias = -(local_time->tm_gmtoff / 60L);
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if (bias > INT32_MAX)
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bias = INT32_MAX;
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tz->Bias = (LONG)bias;
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}
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#else
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tz->Bias = 0;
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#endif
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dtz = winpr_detect_windows_time_zone();
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if (dtz != NULL)
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{
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int status;
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WLog_DBG(TAG, "tz: Bias=%" PRId32 " sn='%s' dln='%s'", dtz->Bias, dtz->StandardName,
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dtz->DaylightName);
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tz->Bias = dtz->Bias;
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tz->StandardBias = 0;
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tz->DaylightBias = 0;
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ZeroMemory(tz->StandardName, sizeof(tz->StandardName));
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ZeroMemory(tz->DaylightName, sizeof(tz->DaylightName));
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status = MultiByteToWideChar(CP_UTF8, 0, dtz->StandardName, -1, tz->StandardName,
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sizeof(tz->StandardName) / sizeof(WCHAR) - 1);
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if (status < 1)
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{
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WLog_ERR(TAG, "StandardName conversion failed - using default");
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goto out_error;
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}
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status = MultiByteToWideChar(CP_UTF8, 0, dtz->DaylightName, -1, tz->DaylightName,
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sizeof(tz->DaylightName) / sizeof(WCHAR) - 1);
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if (status < 1)
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{
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WLog_ERR(TAG, "DaylightName conversion failed - using default");
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goto out_error;
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}
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if ((dtz->SupportsDST) && (dtz->RuleTableCount > 0))
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{
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const TIME_ZONE_RULE_ENTRY* rule =
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winpr_get_current_time_zone_rule(dtz->RuleTable, dtz->RuleTableCount);
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if (rule != NULL)
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{
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tz->DaylightBias = -rule->DaylightDelta;
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tz->StandardDate = rule->StandardDate;
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tz->DaylightDate = rule->DaylightDate;
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}
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}
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free(dtz);
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/* 1 ... TIME_ZONE_ID_STANDARD
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* 2 ... TIME_ZONE_ID_DAYLIGHT */
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return local_time->tm_isdst ? 2 : 1;
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}
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/* could not detect timezone, use computed bias from tm_gmtoff */
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WLog_DBG(TAG, "tz not found, using computed bias %" PRId32 ".", tz->Bias);
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out_error:
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free(dtz);
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memcpy(tz->StandardName, L"Client Local Time", sizeof(tz->StandardName));
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memcpy(tz->DaylightName, L"Client Local Time", sizeof(tz->DaylightName));
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return 0; /* TIME_ZONE_ID_UNKNOWN */
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}
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BOOL SetTimeZoneInformation(const TIME_ZONE_INFORMATION* lpTimeZoneInformation)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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return FALSE;
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}
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BOOL SystemTimeToFileTime(const SYSTEMTIME* lpSystemTime, LPFILETIME lpFileTime)
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{
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WINPR_UNUSED(lpSystemTime);
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WINPR_UNUSED(lpFileTime);
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return FALSE;
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}
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BOOL FileTimeToSystemTime(const FILETIME* lpFileTime, LPSYSTEMTIME lpSystemTime)
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{
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WINPR_UNUSED(lpFileTime);
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WINPR_UNUSED(lpSystemTime);
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return FALSE;
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}
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BOOL SystemTimeToTzSpecificLocalTime(LPTIME_ZONE_INFORMATION lpTimeZone,
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LPSYSTEMTIME lpUniversalTime, LPSYSTEMTIME lpLocalTime)
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{
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WINPR_UNUSED(lpTimeZone);
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WINPR_UNUSED(lpUniversalTime);
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WINPR_UNUSED(lpLocalTime);
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return FALSE;
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}
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BOOL TzSpecificLocalTimeToSystemTime(LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
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LPSYSTEMTIME lpLocalTime, LPSYSTEMTIME lpUniversalTime)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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WINPR_UNUSED(lpLocalTime);
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WINPR_UNUSED(lpUniversalTime);
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return FALSE;
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}
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#endif
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/*
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* GetDynamicTimeZoneInformation is provided by the SDK if _WIN32_WINNT >= 0x0600 in SDKs above 7.1A
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* and incorrectly if _WIN32_WINNT >= 0x0501 in older SDKs
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*/
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#if !defined(_WIN32) || \
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(defined(_WIN32) && (defined(NTDDI_WIN8) && _WIN32_WINNT < 0x0600 || \
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!defined(NTDDI_WIN8) && _WIN32_WINNT < 0x0501)) /* Windows Vista */
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DWORD GetDynamicTimeZoneInformation(PDYNAMIC_TIME_ZONE_INFORMATION pTimeZoneInformation)
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{
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WINPR_UNUSED(pTimeZoneInformation);
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return 0;
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}
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BOOL SetDynamicTimeZoneInformation(const DYNAMIC_TIME_ZONE_INFORMATION* lpTimeZoneInformation)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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return FALSE;
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}
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BOOL GetTimeZoneInformationForYear(USHORT wYear, PDYNAMIC_TIME_ZONE_INFORMATION pdtzi,
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LPTIME_ZONE_INFORMATION ptzi)
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{
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WINPR_UNUSED(wYear);
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WINPR_UNUSED(pdtzi);
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WINPR_UNUSED(ptzi);
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return FALSE;
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}
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#endif
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#if !defined(_WIN32) || (defined(_WIN32) && (_WIN32_WINNT < 0x0601)) /* Windows 7 */
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BOOL SystemTimeToTzSpecificLocalTimeEx(const DYNAMIC_TIME_ZONE_INFORMATION* lpTimeZoneInformation,
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const SYSTEMTIME* lpUniversalTime, LPSYSTEMTIME lpLocalTime)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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WINPR_UNUSED(lpUniversalTime);
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WINPR_UNUSED(lpLocalTime);
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return FALSE;
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}
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BOOL TzSpecificLocalTimeToSystemTimeEx(const DYNAMIC_TIME_ZONE_INFORMATION* lpTimeZoneInformation,
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const SYSTEMTIME* lpLocalTime, LPSYSTEMTIME lpUniversalTime)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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WINPR_UNUSED(lpLocalTime);
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WINPR_UNUSED(lpUniversalTime);
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return FALSE;
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}
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#endif
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#if !defined(_WIN32) || (defined(_WIN32) && (_WIN32_WINNT < 0x0602)) /* Windows 8 */
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DWORD EnumDynamicTimeZoneInformation(const DWORD dwIndex,
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PDYNAMIC_TIME_ZONE_INFORMATION lpTimeZoneInformation)
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{
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WINPR_UNUSED(dwIndex);
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WINPR_UNUSED(lpTimeZoneInformation);
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return 0;
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}
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DWORD GetDynamicTimeZoneInformationEffectiveYears(
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const PDYNAMIC_TIME_ZONE_INFORMATION lpTimeZoneInformation, LPDWORD FirstYear, LPDWORD LastYear)
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{
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WINPR_UNUSED(lpTimeZoneInformation);
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WINPR_UNUSED(FirstYear);
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WINPR_UNUSED(LastYear);
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return 0;
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}
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#endif
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