Poco unable to send email

Question

I am trying to use the Poco library to send an email. Platform is OS X, Yosemite 10.10.2 I am using Qt 5.3 32 bit. I followed the official instructions from here, and since I am using 32 bit Qt, and want the libraries to be statically linked, I used

./configure --omit=Data/ODBC,Data/MySQL --config=Darwin32

(I don't require the MySQL/ODBC modules). And it installed in /usr/local correctly, following which I linked the necessary dynamic libraries (PocoNet and PocoFoundation and 10 other libraries), and tried this following code, which I found here. What I am trying to do is send an email to my gmail account from my account itself:

#include "MailSender.hpp"

#include <Poco/Net/MailMessage.h>
#include <Poco/Net/MailRecipient.h>
#include <Poco/Net/SMTPClientSession.h>
#include <Poco/Net/NetException.h>
#include <Poco/Net/SecureSMTPClientSession.h>
#include <Poco/Net/InvalidCertificateHandler.h>
#include <Poco/Net/AcceptCertificateHandler.h>
#include <Poco/Net/SSLManager.h>
#include <Poco/Net/SecureStreamSocket.h>
#include <Poco/Net/MailRecipient.h>

#include <iostream>
#include <QDebug>

using Poco::Net::InvalidCertificateHandler;
using Poco::Net::AcceptCertificateHandler;
using Poco::Net::Context;
using Poco::Net::SSLManager;
using Poco::Net::SecureStreamSocket;
using Poco::Net::SocketAddress;
using Poco::Net::SecureSMTPClientSession;
using Poco::Net::SMTPClientSession;
using Poco::SharedPtr;
using Poco::Net::MailMessage;
using Poco::Net::MailRecipient;
using namespace std;

MailSender::MailSender()
{
SharedPtr<InvalidCertificateHandler> pCert = new AcceptCertificateHandler(false);

string host = "smtp.gmail.com";
int port = 25;

Context::Ptr pContext = new Poco::Net::Context(Context::CLIENT_USE, "", "", "", Context::VERIFY_NONE, 9, false, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
SSLManager::instance().initializeClient(0, pCert, pContext);

Poco::Net::SecureSMTPClientSession* pSecure = new Poco::Net::SecureSMTPClientSession(host, port);
Poco::Net::SecureSMTPClientSession* pSession_ = new Poco::Net::SecureSMTPClientSession(host, port);

SecureStreamSocket* pSSLSocket = new SecureStreamSocket(pContext);
pSSLSocket->connect(SocketAddress(host, port));
pSecure = new SecureSMTPClientSession(*pSSLSocket);
pSession_ = pSecure;
pSecure->login();
if (!pSecure->startTLS(pContext))
   throw std::string("Failed to start TLS connection.");

std::string sUserName = "my_email_id";
std::string sPassword = "my_password";

pSession_->login(SMTPClientSession::AUTH_LOGIN, sUserName, sPassword);


string to = "my_email_id";
string from = "my_email_id";
string subject = "Your first e-mail message sent using Poco Libraries";
subject = MailMessage::encodeWord(subject, "UTF-8");
string content = "Well done! You've successfully sent your first message using Poco SMTPClientSession";
MailMessage message;
message.setSender(from);
message.addRecipient(MailRecipient(MailRecipient::PRIMARY_RECIPIENT, to));
message.setSubject(subject);
message.setContentType("text/plain; charset=UTF-8");
message.setContent(content, MailMessage::ENCODING_8BIT);



try {
    pSession_->sendMessage(message);
    pSession_->close();
} catch (Poco::Net::SMTPException &e) {
    qDebug() << e.displayText().c_str() << endl;
}
catch (Poco::Net::NetException &e) {
    qDebug() << e.displayText().c_str() << endl;
}

}

When I run this, I get the following error:

libc++abi.dylib: terminating with uncaught exception of type Poco::Net::SSLException: SSL Exception in the Qt console.

The Apple generated crash dump shows this:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x9b7f369a __pthread_kill + 10
1   libsystem_pthread.dylib         0x90a04f19 pthread_kill + 101
2   libsystem_c.dylib               0x96861eee abort + 156
3   libc++abi.dylib                 0x965782f9 abort_message + 169
4   libc++abi.dylib                 0x9659b483 default_terminate_handler() + 272
5   libc++abi.dylib                 0x96598ac0 std::__terminate(void (*)()) + 14
6   libc++abi.dylib                 0x965986ee __cxa_rethrow + 103
7   libPocoNetSSL.30.dylib          0x02c253ff Poco::Net::SecureSocketImpl::connectSSL(bool) + 943
8   libPocoNetSSL.30.dylib          0x02c24fee Poco::Net::SecureSocketImpl::connect(Poco::Net::SocketAddress const&, bool) + 94
9   libPocoNetSSL.30.dylib          0x02c28a61 Poco::Net::SecureStreamSocketImpl::connect(Poco::Net::SocketAddress const&) + 49
10  libPocoNet.30.dylib             0x02b1368b Poco::Net::StreamSocket::connect(Poco::Net::SocketAddress const&) + 27

Somehow, the code fails at pSSLSocket->connect(SocketAddress(host, port));

I have linked PocoNet, PocoNetSSL, PocoFoundation, etc., in all, all 12 dynamic libraries generated.

Any idea how I fix this?

Answer 1

For building, there was a bug building NetSSL examples in static build configuration (not critical but the OP did not know how to work around it), see resolved GitHub issue.

For sending email, see SecureSMTPClientSession with GMail and SSL on Poco forum:

using Poco::Net::InvalidCertificateHandler;
using Poco::Net::AcceptCertificateHandler;
using Poco::Net::Context;
using Poco::Net::SSLManager;
using Poco::Net::SecureStreamSocket;
using Poco::Net::SocketAddress;
using Poco::Net::SecureSMTPClientSession;
using Poco::Net::SMTPClientSession;
using Poco::SharedPtr;

SharedPtr<InvalidCertificateHandler> pCert = new AcceptCertificateHandler(false);
Context::Ptr pContext = new Poco::Net::Context(Context::CLIENT_USE, "", "", "", Context::VERIFY_NONE, 9, false, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
SSLManager::instance().initializeClient(0, pCert, pContext);

SecureStreamSocket* pSSLSocket = new SecureStreamSocket(pContext);
pSSLSocket->connect(SocketAddress(sSmtpServer, nSmtpPort));
pSecure = new SecureSMTPClientSession(*pSSLSocket);
pSession_ = pSecure;
pSecure->login();
if (!pSecure->startTLS(pContext))
   throw std::string("Failed to start TLS connection.");

pSession_->login(SMTPClientSession::AUTH_LOGIN, sUserName, sPassword);
pSession_->sendMessage(*pSelectedMailMessage_);
pSession_->close();

See also NetSSL Mail example:

SharedPtr<InvalidCertificateHandler> pCert = new ConsoleCertificateHandler(false); // ask the user via console
Context::Ptr pContext = new Context(Context::CLIENT_USE, "", "", "", Context::VERIFY_RELAXED, 9, true, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
SSLManager::instance().initializeClient(0, pCert, pContext);

MailMessage message;
message.setSender(sender);
message.addRecipient(MailRecipient(MailRecipient::PRIMARY_RECIPIENT, recipient));
message.setSubject("Hello from the POCO C++ Libraries");
std::string content;
content += "Hello ";
content += recipient;
content += ",\r\n\r\n";
content += "This is a greeting from the POCO C++ Libraries.\r\n\r\n";
std::string logo(reinterpret_cast<const char*>(PocoLogo), sizeof(PocoLogo));
message.addContent(new StringPartSource(content));
message.addAttachment("logo", new StringPartSource(logo, "image/gif"));

SecureSMTPClientSession session(mailhost);
session.login();
session.startTLS(pContext);
if (!username.empty())
{
    session.login(SMTPClientSession::AUTH_LOGIN, username, password);
}
session.sendMessage(message);
session.close();