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tdepim/knode/knprotocolclient.cpp

635 lines
15 KiB

/*
knprotocolclient.cpp
KNode, the KDE newsreader
Copyright (c) 1999-2001 the KNode authors.
See file AUTHORS for details
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, US
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <klocale.h>
#include <kextsock.h>
#include <ksocks.h>
#include "knjobdata.h"
#include "knprotocolclient.h"
KNProtocolClient::KNProtocolClient(int NfdPipeIn, int NfdPipeOut) :
job( 0 ),
inputSize( 10000 ),
fdPipeIn( NfdPipeIn ),
fdPipeOut( NfdPipeOut ),
tcpSocket( -1 ),
mTerminate( false )
{
input = new char[inputSize];
}
KNProtocolClient::~KNProtocolClient()
{
if (isConnected())
closeConnection();
delete [] input;
}
void KNProtocolClient::run()
{
if (0!=pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,NULL))
qWarning("pthread_setcancelstate failed!");
if (0!= pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,NULL))
qWarning("pthread_setcanceltype failed!");
signal(SIGPIPE,SIG_IGN); // ignore sigpipe
waitForWork();
}
void KNProtocolClient::insertJob(KNJobData *newJob)
{
job = newJob;
}
void KNProtocolClient::removeJob()
{
job = 0L;
}
void KNProtocolClient::updatePercentage(int percent)
{
byteCountMode=false;
progressValue = percent*10;
sendSignal(TSprogressUpdate);
}
// main loop, maintains connection and waits for next job
void KNProtocolClient::waitForWork()
{
fd_set fdsR,fdsE;
timeval tv;
int selectRet;
while (true) {
if (isConnected()) { // we are connected, hold the connection for xx secs
FD_ZERO(&fdsR);
FD_SET(fdPipeIn, &fdsR);
FD_SET(tcpSocket, &fdsR);
FD_ZERO(&fdsE);
FD_SET(tcpSocket, &fdsE);
tv.tv_sec = account.hold();
tv.tv_usec = 0;
selectRet = KSocks::self()->select(FD_SETSIZE, &fdsR, NULL, &fdsE, &tv);
if ( mTerminate ) {
clearPipe();
closeConnection();
return;
}
// In addition to the timeout, this will also happen
// if select() returns early because of a signal
if (selectRet == 0) {
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::waitForWork(): hold time elapsed, closing connection.");
#endif
closeConnection(); // nothing happend...
} else {
if (((selectRet > 0)&&(!FD_ISSET(fdPipeIn,&fdsR)))||(selectRet == -1)) {
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::waitForWork(): connection broken, closing it");
#endif
closeSocket();
}
}
}
do {
FD_ZERO(&fdsR);
FD_SET(fdPipeIn, &fdsR);
} while (select(FD_SETSIZE, &fdsR, NULL, NULL, NULL) <= 0); // don't get tricked by signals
clearPipe(); // remove start signal
if (mTerminate)
return;
timer.start();
sendSignal(TSjobStarted);
if (job) {
// qDebug("knode: KNProtocolClient::waitForWork(): got job");
if (job->net()&&!(account == *job->account())) { // server changed
account = *job->account();
if (isConnected())
closeConnection();
}
input[0] = 0; //terminate string
thisLine = input;
nextLine = input;
inputEnd = input;
progressValue = 10;
predictedLines = -1;
doneLines = 0;
byteCount = 0;
byteCountMode = true;
if (!job->net()) // job needs no net access
processJob();
else {
if (!isConnected())
openConnection();
if (isConnected()) // connection is ready
processJob();
}
errorPrefix = TQString();
clearPipe();
}
sendSignal(TSworkDone); // emit stopped signal
}
}
void KNProtocolClient::processJob()
{}
// connect, handshake and authorization
bool KNProtocolClient::openConnection()
{
sendSignal(TSconnect);
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::openConnection(): opening connection");
#endif
if (account.server().isEmpty()) {
job->setErrorString(i18n("Unable to resolve hostname"));
return false;
}
KExtendedSocket ks;
ks.setAddress(account.server(), account.port());
ks.setTimeout(account.timeout());
if (ks.connect() < 0) {
if (ks.status() == IO_LookupError) {
job->setErrorString(i18n("Unable to resolve hostname"));
} else if (ks.status() == IO_ConnectError) {
job->setErrorString(i18n("Unable to connect:\n%1").tqarg(KExtendedSocket::strError(ks.status(), errno)));
} else if (ks.status() == IO_TimeOutError)
job->setErrorString(i18n("A delay occurred which exceeded the\ncurrent timeout limit."));
else
job->setErrorString(i18n("Unable to connect:\n%1").tqarg(KExtendedSocket::strError(ks.status(), errno)));
closeSocket();
return false;
}
tcpSocket = ks.fd();
ks.release();
return true;
}
// sends TQUIT-command and closes the socket
void KNProtocolClient::closeConnection()
{
fd_set fdsW;
timeval tv;
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::closeConnection(): closing connection");
#endif
FD_ZERO(&fdsW);
FD_SET(tcpSocket, &fdsW);
tv.tv_sec = 0;
tv.tv_usec = 0;
int ret = KSocks::self()->select(FD_SETSIZE, NULL, &fdsW, NULL, &tv);
if (ret > 0) { // we can write...
TQCString cmd = "TQUIT\r\n";
int todo = cmd.length();
KSocks::self()->write(tcpSocket,&cmd.data()[0],todo);
}
closeSocket();
}
// sends a command (one line), return code is written to rep
bool KNProtocolClient::sendCommand(const TQCString &cmd, int &rep)
{
if (!sendStr(cmd + "\r\n"))
return false;
if (!getNextResponse(rep))
return false;
return true;
}
// checks return code and calls handleErrors() if necessary
bool KNProtocolClient::sendCommandWCheck(const TQCString &cmd, int rep)
{
int code;
if (!sendCommand(cmd,code))
return false;
if (code!=rep) {
handleErrors();
return false;
}
return true;
}
// sends a message (multiple lines)
bool KNProtocolClient::sendMsg(const TQCString &msg)
{
const char *line = msg.data();
const char *end;
TQCString buffer;
size_t length;
char inter[10000];
progressValue = 100;
predictedLines = msg.length()/80; // rule of thumb
while ((end = ::strstr(line,"\r\n"))) {
if (line[0]=='.') // expand one period to double period...
buffer.append(".");
length = end-line+2;
if ((buffer.length()>1)&&((buffer.length()+length)>1024)) { // artifical limit, because I don't want to generate too large blocks
if (!sendStr(buffer))
return false;
buffer = "";
}
if (length > 9500) {
job->setErrorString(i18n("Message size exceeded the size of the internal buffer."));
closeSocket();
return false;
}
memcpy(inter,line,length);
inter[length]=0; // terminate string
buffer += inter;
line = end+2;
doneLines++;
}
buffer += ".\r\n";
if (!sendStr(buffer))
return false;
return true;
}
// reads next complete line of input
bool KNProtocolClient::getNextLine()
{
thisLine = nextLine;
nextLine = strstr(thisLine,"\r\n");
if (nextLine) { // there is another full line in the inputbuffer
nextLine[0] = 0; // terminate string
nextLine[1] = 0;
nextLine+=2;
return true;
}
unsigned int div = inputEnd-thisLine+1; // hmmm, I need to fetch more input from the server...
memmove(input,thisLine,div); // save last, incomplete line
thisLine = input;
inputEnd = input+div-1;
do {
div = inputEnd-thisLine+1;
if ((div) > inputSize-100) {
inputSize += 10000;
char *newInput = new char[inputSize];
memmove(newInput,input,div);
delete [] input;
input = newInput;
thisLine = input;
inputEnd = input+div-1;
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::getNextLine(): input buffer enlarged");
#endif
}
if (!waitForRead())
return false;
int received;
do {
received = KSocks::self()->read(tcpSocket, inputEnd, inputSize-(inputEnd-input)-1);
} while ((received<0)&&(errno==EINTR)); // don't get tricked by signals
if (received <= 0) {
job->setErrorString(i18n("The connection is broken."));
closeSocket();
return false;
}
// remove null characters that some stupid servers return...
for (int i=0; i<received; i++)
if (inputEnd[i] == 0) {
memmove(inputEnd+i,inputEnd+i+1,received-i-1);
received--;
i--;
}
inputEnd += received;
inputEnd[0] = 0; // terminate *char
byteCount += received;
} while (!(nextLine = strstr(thisLine,"\r\n")));
if (timer.elapsed()>50) { // reduce framerate to 20 f/s
timer.start();
if (predictedLines > 0)
progressValue = 100 + (doneLines*900/predictedLines);
sendSignal(TSprogressUpdate);
}
nextLine[0] = 0; // terminate string
nextLine[1] = 0;
nextLine+=2;
return true;
}
// receives a message (multiple lines)
bool KNProtocolClient::getMsg(TQStrList &msg)
{
char *line;
while (getNextLine()) {
line = getCurrentLine();
if (line[0]=='.') {
if (line[1]=='.')
line++; // collapse double period into one
else
if (line[1]==0)
return true; // message complete
}
msg.append(line);
doneLines++;
}
return false; // getNextLine() failed
}
// reads next line and returns the response code
bool KNProtocolClient::getNextResponse(int &code)
{
if (!getNextLine())
return false;
code = -1;
code = atoi(thisLine);
return true;
}
// checks return code and calls handleErrors() if necessary
bool KNProtocolClient::checkNextResponse(int code)
{
if (!getNextLine())
return false;
if (atoi(thisLine)!=code) {
handleErrors();
return false;
}
return true;
}
// interprets error code, generates error message and closes the connection
void KNProtocolClient::handleErrors()
{
if (errorPrefix.isEmpty())
job->setErrorString(i18n("An error occurred:\n%1").tqarg(thisLine));
else
job->setErrorString(errorPrefix + thisLine);
closeConnection();
}
void KNProtocolClient::sendSignal(threadSignal s)
{
int signal=(int)s;
// qDebug("knode: KNProtcolClient::sendSignal() : sending signal to main thread");
write(fdPipeOut, &signal, sizeof(int));
}
// waits until socket is readable
bool KNProtocolClient::waitForRead()
{
fd_set fdsR,fdsE;
timeval tv;
int ret;
do {
FD_ZERO(&fdsR);
FD_SET(fdPipeIn, &fdsR);
FD_SET(tcpSocket, &fdsR);
FD_ZERO(&fdsE);
FD_SET(tcpSocket, &fdsE);
FD_SET(fdPipeIn, &fdsE);
tv.tv_sec = account.timeout();
tv.tv_usec = 0;
ret = KSocks::self()->select(FD_SETSIZE, &fdsR, NULL, &fdsE, &tv);
} while ((ret<0)&&(errno==EINTR)); // don't get tricked by signals
if (ret == -1) { // select failed
if (job) {
TQString str = i18n("Communication error:\n");
str += strerror(errno);
job->setErrorString(str);
}
closeSocket();
return false;
}
if (ret == 0) { // Nothing happend, timeout
if (job)
job->setErrorString(i18n("A delay occurred which exceeded the\ncurrent timeout limit."));
closeConnection();
return false;
}
if (ret > 0) {
if (FD_ISSET(fdPipeIn,&fdsR)) { // stop signal
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::waitForRead(): got stop signal");
#endif
closeConnection();
return false;
}
if (FD_ISSET(tcpSocket,&fdsE)||FD_ISSET(fdPipeIn,&fdsE)) { // broken pipe, etc
if (job)
job->setErrorString(i18n("The connection is broken."));
closeSocket();
return false;
}
if (FD_ISSET(tcpSocket,&fdsR)) // all ok
return true;
}
if (job)
job->setErrorString(i18n("Communication error"));
closeSocket();
return false;
}
// used by sendBuffer() & connect()
bool KNProtocolClient::waitForWrite()
{
fd_set fdsR,fdsW,fdsE;
timeval tv;
int ret;
do {
FD_ZERO(&fdsR);
FD_SET(fdPipeIn, &fdsR);
FD_SET(tcpSocket, &fdsR);
FD_ZERO(&fdsW);
FD_SET(tcpSocket, &fdsW);
FD_ZERO(&fdsE);
FD_SET(tcpSocket, &fdsE);
FD_SET(fdPipeIn, &fdsE);
tv.tv_sec = account.timeout();
tv.tv_usec = 0;
ret = KSocks::self()->select(FD_SETSIZE, &fdsR, &fdsW, &fdsE, &tv);
} while ((ret<0)&&(errno==EINTR)); // don't get tricked by signals
if (ret == -1) { // select failed
if (job) {
TQString str = i18n("Communication error:\n");
str += strerror(errno);
job->setErrorString(str);
}
closeSocket();
return false;
}
if (ret == 0) { // nothing happend, timeout
if (job)
job->setErrorString(i18n("A delay occurred which exceeded the\ncurrent timeout limit."));
closeConnection();
return false;
}
if (ret > 0) {
if (FD_ISSET(fdPipeIn,&fdsR)) { // stop signal
#ifndef NDEBUG
qDebug("knode: KNProtocolClient::waitForWrite(): got stop signal");
#endif
closeConnection();
return false;
}
if (FD_ISSET(tcpSocket,&fdsR)||FD_ISSET(tcpSocket,&fdsE)||FD_ISSET(fdPipeIn,&fdsE)) { // broken pipe, etc
if (job)
job->setErrorString(i18n("The connection is broken."));
closeSocket();
return false;
}
if (FD_ISSET(tcpSocket,&fdsW)) // all ok
return true;
}
if (job)
job->setErrorString(i18n("Communication error"));
closeSocket();
return false;
}
void KNProtocolClient::closeSocket()
{
if (-1 != tcpSocket) {
close(tcpSocket);
tcpSocket = -1;
}
}
// sends str to the server
bool KNProtocolClient::sendStr(const TQCString &str)
{
int ret;
int todo = str.length();
int done = 0;
while (todo > 0) {
if (!waitForWrite())
return false;
ret = KSocks::self()->write(tcpSocket,&str.data()[done],todo);
if (ret <= 0) {
if (job) {
TQString str = i18n("Communication error:\n");
str += strerror(errno);
job->setErrorString(str);
}
closeSocket();
return false;
} else {
done += ret;
todo -= ret;
}
byteCount += ret;
}
if (timer.elapsed()>50) { // reduce framerate to 20 f/s
timer.start();
if (predictedLines > 0)
progressValue = 100 + (doneLines/predictedLines)*900;
sendSignal(TSprogressUpdate);
}
return true;
}
// removes start/stop signal
void KNProtocolClient::clearPipe()
{
fd_set fdsR;
timeval tv;
int selectRet;
char buf;
tv.tv_sec = 0;
tv.tv_usec = 0;
do {
FD_ZERO(&fdsR);
FD_SET(fdPipeIn,&fdsR);
if (1==(selectRet=select(FD_SETSIZE,&fdsR,NULL,NULL,&tv)))
if ( read(fdPipeIn, &buf, 1 ) == -1 )
::perror( "clearPipe()" );
} while (selectRet == 1);
}