我正在尝试通过 Mono（版本 2.10.8.1 和 3.0.6）在 debian 上使用 Exchange EWS 2 我正在使用 vs2012 在 Windows 8 上进行开发。
该程序在 Windows 上运行良好，我得到了预期的输出。
然而，在单声道上，我不断收到以下输出和异常。
<Trace Tag="AutodiscoverConfiguration" Tid="1" Time="2013-03-07 19:09:05Z">
Starting SCP lookup for domainName='example.com', root path=''
</Trace>
Connect Error
Unhandled Exception: LdapException: (91) Connect Error
System.Net.Sockets.SocketException: No such host is known
at System.Net.Dns.hostent_to_IPHostEntry (System.String h_name, System.String[] h_aliases, System.String[] h_addrlist) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostByName (System.String hostName) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostAddresses (System.String hostNameOrAddress) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient.Connect (System.String hostname, Int32 port) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient..ctor (System.String hostname, Int32 port) [0x00000] in <filename unknown>:0
at Novell.Directory.Ldap.Connection.connect (System.String host, Int32 port, Int32 semaphoreId) [0x00000] in <filename unknown>:0
[ERROR] FATAL UNHANDLED EXCEPTION: LdapException: (91) Connect Error
System.Net.Sockets.SocketException: No such host is known
at System.Net.Dns.hostent_to_IPHostEntry (System.String h_name, System.String[] h_aliases, System.String[] h_addrlist) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostByName (System.String hostName) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00000] in <filename unknown>:0
at System.Net.Dns.GetHostAddresses (System.String hostNameOrAddress) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient.Connect (System.String hostname, Int32 port) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient..ctor (System.String hostname, Int32 port) [0x00000] in <filename unknown>:0
at Novell.Directory.Ldap.Connection.connect (System.String host, Int32 port, Int32 semaphoreId) [0x00000] in <filename unknown>:0
显然它正在尝试查找它找不到的主机。我的 windows 和 linux 系统都使用相同的 dns 服务器，所以这不是导致问题的原因。
当它工作时，我通读了 Windows 上的跟踪 - 跟踪显示查找失败了几次，并且自动发现方法尝试了几个不同的 url，直到它找到一个有效的 url - 在单声道上，但它似乎在第一次之后倒下失败，这就是它的结束。
我已经尝试在单声道上使用 ews 进行谷歌搜索，但我还没有找到任何这样做的人，所以我不确定还有什么可以尝试的。
使用的代码如下 - 几乎所有代码都取自 http://msdn.microsoft.com/en-us/library/exchange/dd633709(v=exchg.80).aspx上的代码示例
class Program
{
private static int verbose = 10;
private static string loginEmail = "email@example.com";
private static string password = "#############";
static void Main(string[] args)
{
try
{
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
service.Credentials = new WebCredentials(loginEmail, password);
if (verbose >= 10)
{
service.TraceEnabled = true;
service.TraceFlags = TraceFlags.All;
}
service.AutodiscoverUrl(loginEmail, RedirectionUrlValidationCallback);
Console.WriteLine("AutoDiscover Completed");
getContacts(service);
Console.ReadLine();
}
catch (Exception e) {
Console.WriteLine(e.Message);
foreach (string key in e.Data.Keys)
{
Console.WriteLine(String.Format("{0}: {1}",key, e.Data[key]));
}
throw e;
}
}
private static void getContacts(ExchangeService service){
// Get the number of items in the Contacts folder.
ContactsFolder contactsfolder = ContactsFolder.Bind(service, WellKnownFolderName.Contacts);
// Set the number of items to the number of items in the Contacts folder or 1000, whichever is smaller.
int numItems = contactsfolder.TotalCount < 1000 ? contactsfolder.TotalCount : 1000;
// Instantiate the item view with the number of items to retrieve from the Contacts folder.
ItemView view = new ItemView(numItems);
// To keep the request smaller, request only the display name property.
//view.PropertySet = new PropertySet(BasePropertySet.IdOnly, ContactSchema.DisplayName);
// Retrieve the items in the Contacts folder that have the properties that you selected.
FindItemsResults<Item> contactItems = service.FindItems(WellKnownFolderName.Contacts, view);
// Display the list of contacts.
foreach (Item item in contactItems)
{
if (item is Contact)
{
Contact contact = item as Contact;
Console.WriteLine();
Console.WriteLine(contact.DisplayName);
if (verbose >= 2)
{
Console.WriteLine(" " + contact.Id);
}
try
{
Console.WriteLine(" " + contact.EmailAddresses[EmailAddressKey.EmailAddress1].ToString());
}
catch (Exception e)
{
if (verbose >= 5)
{
Console.WriteLine(" " + "Email Address 1 Not Available : " + e.Message);
}
}
}
}
}
#region taken from tutorial
private static bool CertificateValidationCallBack(
object sender,
System.Security.Cryptography.X509Certificates.X509Certificate certificate,
System.Security.Cryptography.X509Certificates.X509Chain chain,
System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
// If the certificate is a valid, signed certificate, return true.
if (sslPolicyErrors == System.Net.Security.SslPolicyErrors.None)
{
return true;
}
// If there are errors in the certificate chain, look at each error to determine the cause.
if ((sslPolicyErrors & System.Net.Security.SslPolicyErrors.RemoteCertificateChainErrors) != 0)
{
if (chain != null && chain.ChainStatus != null)
{
foreach (System.Security.Cryptography.X509Certificates.X509ChainStatus status in chain.ChainStatus)
{
if ((certificate.Subject == certificate.Issuer) &&
(status.Status == System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.UntrustedRoot))
{
// Self-signed certificates with an untrusted root are valid.
continue;
}
else
{
if (status.Status != System.Security.Cryptography.X509Certificates.X509ChainStatusFlags.NoError)
{
// If there are any other errors in the certificate chain, the certificate is invalid,
// so the method returns false.
return false;
}
}
}
}
// When processing reaches this line, the only errors in the certificate chain are
// untrusted root errors for self-signed certificates. These certificates are valid
// for default Exchange server installations, so return true.
return true;
}
else
{
// In all other cases, return false.
return false;
}
}
private static bool RedirectionUrlValidationCallback(string redirectionUrl)
{
// The default for the validation callback is to reject the URL.
bool result = false;
Uri redirectionUri = new Uri(redirectionUrl);
// Validate the contents of the redirection URL. In this simple validation
// callback, the redirection URL is considered valid if it is using HTTPS
// to encrypt the authentication credentials.
if (redirectionUri.Scheme == "https")
{
result = true;
}
return result;
}
#endregion
}
BeepBeep 的回答帮助我解决了这个问题。
在使用 BeepBeep 的建议后，我遇到了一个问题，即 Mono 似乎没有 dnsapi.dll（根据例外情况）。我现在通过跳过自动发现解决了这个问题。
为了做到这一点，我更换了
service.AutodiscoverUrl(loginEmail, RedirectionUrlValidationCallback);
和
service.Url = new Uri("https://blah.com/ews/exchange.asmx");
然后我的证书出现了错误（异常表示“请求或解密错误”） - 可以说，您需要知道默认情况下 mono 不包含任何根 ca 证书，更多信息在这里：Mono FAQ关于安全
我选择了使用 mozroots 工具获得我想要的证书的更懒惰的方式。然而，这并没有按预期工作，并且错误仍然存在。
然后我也使用上述常见问题解答中的 tlstest 来确定问题 - 它与我正在使用的证书链有关（根被接受，但中间体未被接受）。然后，我使用 FAQ (certmgr) 中记录的第三个工具来安装证书。
之后，一切正常。