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/*
Copyright (c) 2016 Christian Mollekopf <mollekopf@kolabsys.com>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include "mailtransport.h"
#include <QByteArray>
#include <QList>
#include <QLoggingCategory>
#include <stdio.h>
#include <string.h>
#include <curl/curl.h>
Q_LOGGING_CATEGORY(mailtransportCategory, "mailtransport")
struct upload_status {
int offset;
const char *data;
};
extern "C" {
static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
{
struct upload_status *upload_ctx = (struct upload_status *)userp;
const char *data;
if ((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
return 0;
}
data = &upload_ctx->data[upload_ctx->offset];
if (data) {
size_t len = strlen(data);
if (len > size * nmemb) {
len = size * nmemb;
}
memcpy(ptr, data, len);
upload_ctx->offset += len;
return len;
}
return 0;
}
}
struct CurlVersionInfo {
bool supportsSsl;
QByteArray info;
};
CurlVersionInfo getVersionInfo()
{
CurlVersionInfo versionInfo;
curl_version_info_data *data = curl_version_info(CURLVERSION_NOW);
if (data->ssl_version) {
versionInfo.info += "SSL support available: " + QByteArray{data->ssl_version} + "\n";
versionInfo.supportsSsl = true;
} else {
versionInfo.info += "No SSL support available.\n";
versionInfo.supportsSsl = false;
}
return versionInfo;
}
bool sendMessageCurl(const char *to[], int numTos,
const char *cc[], int numCcs,
const char *msg,
bool useTls,
const char* from,
const char *username, const char *password,
const char *server, bool verifyPeer, const QByteArray &cacert, QByteArray &errorMessage,
bool enableDebugOutput,
int (*debug_callback)(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr),
int (*progress_callback)(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow)
)
{
CURL *curl;
CURLcode res = CURLE_OK;
struct curl_slist *recipients = NULL;
struct upload_status upload_ctx;
upload_ctx.offset = 0;
upload_ctx.data = msg;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_USERNAME, username);
curl_easy_setopt(curl, CURLOPT_PASSWORD, password);
curl_easy_setopt(curl, CURLOPT_URL, server);
if (useTls) {
curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
}
if (!verifyPeer) {
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
}
if (!cacert.isEmpty()) {
curl_easy_setopt(curl, CURLOPT_CAINFO, cacert.constData());
}
if (from) {
curl_easy_setopt(curl, CURLOPT_MAIL_FROM, from);
}
for (int i = 0; i < numTos; i++) {
recipients = curl_slist_append(recipients, to[i]);
}
for (int i = 0; i < numCcs; i++) {
recipients = curl_slist_append(recipients, cc[i]);
}
curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
/* We're using a callback function to specify the payload (the headers and
* body of the message). You could just use the CURLOPT_READDATA option to
* specify a FILE pointer to read from. */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
/* Since the traffic will be encrypted, it is very useful to turn on debug
* information within libcurl to see what is happening during the transfer.
*/
if (enableDebugOutput) {
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
}
curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, debug_callback);
//Connection timeout of 40s
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 40L);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);
curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, progress_callback);
char errorBuffer[CURL_ERROR_SIZE];
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errorBuffer);
res = curl_easy_perform(curl);
if(res != CURLE_OK) {
errorMessage += "Error code: " + QByteArray::number(res) + ", ";
errorMessage += curl_easy_strerror(res);
errorMessage += "; ";
}
long http_code = 0;
curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &http_code);
if (http_code == 200 && res != CURLE_ABORTED_BY_CALLBACK) {
//Succeeded
} else {
errorMessage += errorBuffer;
}
curl_slist_free_all(recipients);
curl_easy_cleanup(curl);
return res == CURLE_OK;
}
return false;
}
MailTransport::SendResult MailTransport::sendMessage(const KMime::Message::Ptr &message, const QByteArray &server, const QByteArray &username, const QByteArray &password, const QByteArray &cacert, MailTransport::Options options)
{
QByteArray from(message->from(true)->mailboxes().isEmpty() ? QByteArray() : message->from(true)->mailboxes().first().address());
QList<QByteArray> toList;
for (const auto &mb : message->to(true)->mailboxes()) {
toList << mb.address();
}
QList<QByteArray> ccList;
for (const auto &mb : message->cc(true)->mailboxes()) {
ccList << mb.address();
}
const bool verifyPeer = options.testFlag(VerifyPeers);
const bool useTls = options.testFlag(UseTls);
const int numTos = toList.size();
const char* to[numTos];
for (int i = 0; i < numTos; i++) {
to[i] = toList.at(i);
}
const int numCcs = ccList.size();
const char* cc[numCcs];
for (int i = 0; i < numCcs; i++) {
cc[i] = ccList.at(i);
}
//Because curl will fail with smtps, but it won't tell you why.
auto serverAddress = server;
serverAddress.replace("smtps://", "smtp://");
const auto versionInfo = getVersionInfo();
if (useTls && !versionInfo.supportsSsl) {
qCWarning(mailtransportCategory) << "libcurl built without ssl support: " << versionInfo.info;
}
bool enableDebugOutput = QLoggingCategory{"mailtransport"}.isEnabled(QtDebugMsg);
QByteArray errorMessage;
auto ret = sendMessageCurl(to, numTos, cc, numCcs,
message->encodedContent(),
useTls,
from.isEmpty() ? nullptr : from,
username, password,
serverAddress, verifyPeer, cacert,
errorMessage,
enableDebugOutput,
[] (CURL *handle, curl_infotype type, char *data, size_t size, void *) -> int {
//FIXME all a callback passed to sendMessage using the provided user pointer,
//because lambdas with captures cannot be converted to function pointers.
qCDebug(mailtransportCategory) << QString::fromUtf8(data, size);
return 0;
},
[] (void *, curl_off_t, curl_off_t, curl_off_t ultotal, curl_off_t ulnow) -> int {
if (ultotal > 0) {
qCDebug(mailtransportCategory) << "Upload progress " << ulnow << " out of " << ultotal;
}
return 0;
});
return {ret, errorMessage};
}
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