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proxy.c
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proxy.c
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/* cproxy - Copyright (C) 2012 Aaron Riekenberg ([email protected]).
cproxy 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 3 of the License, or
(at your option) any later version.
cproxy 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with cproxy. If not, see <http://www.gnu.org/licenses/>.
*/
#include "bufferpool.h"
#include "errutil.h"
#include "fdutil.h"
#include "linkedlist.h"
#include "log.h"
#include "memutil.h"
#include "pollutil.h"
#include "socketutil.h"
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#define DEFAULT_BUFFER_SIZE (16 * 1024)
#define DEFAULT_NO_DELAY_SETTING (false)
#define DEFAULT_NUM_IO_THREADS (1)
#define MAX_OPERATIONS_FOR_ONE_FD (100)
#define INITIAL_CONNECTION_SOCKET_INFO_POOL_SIZE (16)
static void printUsageAndExit()
{
printf("Usage:\n"
" cproxy -l <local addr>:<local port>\n"
" [-l <local addr>:<local port>...]\n"
" -r <remote addr>:<remote port>\n"
" [-b <buf size>] [-n] [-t <num io threads>]\n"
"Arguments:\n"
" -l <local addr>:<local port>: specify listen address and port\n"
" -r <remote addr>:<remote port>: specify remote address and port\n"
" -b <buf size>: specify session buffer size in bytes\n"
" -n: enable TCP no delay\n"
" -t: <num io threads>: specify number of I/O threads\n");
exit(1);
}
static int parseBufferSize(
const char* optarg)
{
const int bufferSize = atoi(optarg);
if (bufferSize <= 0)
{
proxyLog("invalid buffer size %s", optarg);
exit(1);
}
return bufferSize;
}
static int parseNumIOThreads(
const char* optarg)
{
const int numIOThreads = atoi(optarg);
if (numIOThreads <= 0)
{
proxyLog("invalid num io threads %s", optarg);
exit(1);
}
return numIOThreads;
}
static struct addrinfo* parseAddrPort(
const char* optarg)
{
struct addrinfo hints;
struct addrinfo* addressInfo = NULL;
char addressString[NI_MAXHOST];
char portString[NI_MAXSERV];
const size_t optargLen = strlen(optarg);
size_t colonIndex;
size_t hostLength;
size_t portLength;
int retVal;
colonIndex = optargLen;
while (colonIndex > 0)
{
--colonIndex;
if (optarg[colonIndex] == ':')
{
break;
}
}
if ((colonIndex <= 0) ||
(colonIndex >= (optargLen - 1)))
{
proxyLog("invalid address:port argument: '%s'", optarg);
exit(1);
}
hostLength = colonIndex;
portLength = optargLen - colonIndex - 1;
if ((hostLength >= NI_MAXHOST) ||
(portLength >= NI_MAXSERV))
{
proxyLog("invalid address:port argument: '%s'", optarg);
exit(1);
}
strncpy(addressString, optarg, hostLength);
addressString[hostLength] = 0;
strncpy(portString, &(optarg[colonIndex + 1]), portLength);
portString[portLength] = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_ADDRCONFIG;
if (((retVal = getaddrinfo(addressString, portString,
&hints, &addressInfo)) != 0) ||
(addressInfo == NULL))
{
proxyLog("error resolving address %s %s",
optarg, gai_strerror(retVal));
exit(1);
}
return addressInfo;
}
static struct addrinfo* parseRemoteAddrPort(
const char* optarg,
struct AddrPortStrings* addrPortStrings)
{
struct addrinfo* addressInfo = parseAddrPort(optarg);
if (addressToNameAndPort(
addressInfo->ai_addr,
addressInfo->ai_addrlen,
addrPortStrings) < 0)
{
exit(1);
}
return addressInfo;
}
struct ProxySettings
{
size_t bufferSize;
bool noDelay;
size_t numIOThreads;
struct LinkedList serverAddrInfoList;
struct addrinfo* remoteAddrInfo;
struct AddrPortStrings remoteAddrPortStrings;
};
static const struct ProxySettings* processArgs(
int argc,
char** argv)
{
int retVal;
bool foundLocalAddress = false;
bool foundRemoteAddress = false;
struct ProxySettings* proxySettings =
checkedCalloc(1, sizeof(struct ProxySettings));
proxySettings->bufferSize = DEFAULT_BUFFER_SIZE;
proxySettings->noDelay = DEFAULT_NO_DELAY_SETTING;
proxySettings->numIOThreads = DEFAULT_NUM_IO_THREADS;
initializeLinkedList(&(proxySettings->serverAddrInfoList));
do
{
retVal = getopt(argc, argv, "b:l:nr:t:");
switch (retVal)
{
case 'b':
proxySettings->bufferSize = parseBufferSize(optarg);
break;
case 'l':
addToLinkedList(&(proxySettings->serverAddrInfoList),
parseAddrPort(optarg));
foundLocalAddress = true;
break;
case 'n':
proxySettings->noDelay = true;
break;
case 'r':
if (foundRemoteAddress)
{
printUsageAndExit();
}
proxySettings->remoteAddrInfo =
parseRemoteAddrPort(
optarg,
&(proxySettings->remoteAddrPortStrings));
foundRemoteAddress = true;
break;
case 't':
proxySettings->numIOThreads = parseNumIOThreads(optarg);
break;
case '?':
printUsageAndExit();
break;
}
}
while (retVal != -1);
if ((!foundLocalAddress) || (!foundRemoteAddress))
{
printUsageAndExit();
}
return proxySettings;
}
static void setupSignals()
{
struct sigaction newAction;
memset(&newAction, 0, sizeof(struct sigaction));
newAction.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &newAction, NULL) < 0)
{
proxyLog("sigaction error errno = %d", errno);
exit(1);
}
}
struct ServerSocketInfo
{
int socket;
};
enum ConnectionSocketInfoType
{
CLIENT_TO_PROXY,
PROXY_TO_REMOTE
};
struct ConnectionSocketInfo
{
int socket;
enum ConnectionSocketInfoType type;
size_t waitingToWriteBufferOffset;
size_t waitingToWriteBufferSize;
size_t waitingToWriteBufferCapacity;
bool disconnectWhenWriteFinishes;
bool waitingForConnect;
bool waitingForRead;
bool waitingForWrite;
struct ConnectionSocketInfo* relatedConnectionSocketInfo;
struct AddrPortStrings clientAddrPortStrings;
struct AddrPortStrings serverAddrPortStrings;
unsigned char waitingToWriteBuffer[];
};
static void addConnectionSocketInfoToPollState(
struct PollState* pollState,
struct ConnectionSocketInfo* connectionSocketInfo)
{
addPollFDToPollState(
pollState,
connectionSocketInfo->socket,
connectionSocketInfo,
(connectionSocketInfo->waitingForRead ?
INTERESTED_IN_READ_EVENTS :
NOT_INTERESTED_IN_READ_EVENTS),
((connectionSocketInfo->waitingForConnect ||
connectionSocketInfo->waitingForWrite) ?
INTERESTED_IN_WRITE_EVENTS :
NOT_INTERESTED_IN_WRITE_EVENTS));
}
static void updatePollStateForConnectionSocketInfo(
struct PollState* pollState,
struct ConnectionSocketInfo* connectionSocketInfo)
{
updatePollFDInPollState(
pollState,
connectionSocketInfo->socket,
connectionSocketInfo,
(connectionSocketInfo->waitingForRead ?
INTERESTED_IN_READ_EVENTS :
NOT_INTERESTED_IN_READ_EVENTS),
((connectionSocketInfo->waitingForConnect ||
connectionSocketInfo->waitingForWrite) ?
INTERESTED_IN_WRITE_EVENTS :
NOT_INTERESTED_IN_WRITE_EVENTS));
}
static void setupServerSockets(
const struct LinkedList* serverAddrInfoList,
struct PollState* pollState)
{
struct LinkedListNode* nodePtr;
for (nodePtr = serverAddrInfoList->head;
nodePtr;
nodePtr = nodePtr->next)
{
const struct addrinfo* listenAddrInfo = nodePtr->data;
struct AddrPortStrings serverAddrPortStrings;
struct ServerSocketInfo* serverSocketInfo =
checkedMalloc(sizeof(struct ServerSocketInfo));
if (addressToNameAndPort(listenAddrInfo->ai_addr,
listenAddrInfo->ai_addrlen,
&serverAddrPortStrings) < 0)
{
proxyLog("error resolving server listen address");
exit(1);
}
serverSocketInfo->socket = socket(listenAddrInfo->ai_family,
listenAddrInfo->ai_socktype,
listenAddrInfo->ai_protocol);
if (serverSocketInfo->socket < 0)
{
proxyLog("error creating server socket %s:%s",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString);
exit(1);
}
if (setSocketReuseAddress(serverSocketInfo->socket) < 0)
{
proxyLog("setSocketReuseAddress error on server socket %s:%s",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString);
exit(1);
}
if (bind(serverSocketInfo->socket,
listenAddrInfo->ai_addr,
listenAddrInfo->ai_addrlen) < 0)
{
proxyLog("bind error on server socket %s:%s",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString);
exit(1);
}
if (setSocketListening(serverSocketInfo->socket) < 0)
{
proxyLog("listen error on server socket %s:%s",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString);
exit(1);
}
if (setFDNonBlocking(serverSocketInfo->socket) < 0)
{
proxyLog("error setting non-blocking on server socket %s:%s",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString);
exit(1);
}
proxyLog("listening on %s:%s (fd=%d)",
serverAddrPortStrings.addrString,
serverAddrPortStrings.portString,
serverSocketInfo->socket);
addPollFDToPollState(
pollState,
serverSocketInfo->socket,
serverSocketInfo,
INTERESTED_IN_READ_EVENTS,
NOT_INTERESTED_IN_WRITE_EVENTS);
}
}
static bool setupClientSocket(
int clientSocket,
const struct ProxySettings* proxySettings,
struct AddrPortStrings* clientAddrPortStrings,
struct AddrPortStrings* proxyServerAddrPortStrings)
{
struct sockaddr_storage clientAddress;
socklen_t clientAddressSize;
struct sockaddr_storage proxyServerAddress;
socklen_t proxyServerAddressSize;
if (setFDNonBlocking(clientSocket) < 0)
{
proxyLog("error setting non-blocking on accepted socket");
return false;
}
if ((proxySettings->noDelay) && (setSocketNoDelay(clientSocket) < 0))
{
proxyLog("error setting no delay on accepted socket");
return false;
}
clientAddressSize = sizeof(clientAddress);
if (getpeername(
clientSocket,
(struct sockaddr*)&clientAddress,
&clientAddressSize) < 0)
{
proxyLog("getpeername error errno = %d", errno);
return false;
}
if (addressToNameAndPort((struct sockaddr*)&clientAddress,
clientAddressSize,
clientAddrPortStrings) < 0)
{
proxyLog("error getting client address name and port");
return false;
}
proxyServerAddressSize = sizeof(proxyServerAddress);
if (getsockname(
clientSocket,
(struct sockaddr*)&proxyServerAddress,
&proxyServerAddressSize) < 0)
{
proxyLog("getsockname error errno = %d", errno);
return false;
}
if (addressToNameAndPort((struct sockaddr*)&proxyServerAddress,
proxyServerAddressSize,
proxyServerAddrPortStrings) < 0)
{
proxyLog("error getting proxy server address name and port");
return false;
}
proxyLog("connect client to proxy %s:%s -> %s:%s (fd=%d)",
clientAddrPortStrings->addrString,
clientAddrPortStrings->portString,
proxyServerAddrPortStrings->addrString,
proxyServerAddrPortStrings->portString,
clientSocket);
return true;
}
enum RemoteSocketStatus
{
REMOTE_SOCKET_ERROR,
REMOTE_SOCKET_CONNECTED,
REMOTE_SOCKET_IN_PROGRESS
};
struct RemoteSocketResult
{
enum RemoteSocketStatus status;
int remoteSocket;
};
static struct RemoteSocketResult createRemoteSocket(
const struct ProxySettings* proxySettings,
struct AddrPortStrings* proxyClientAddrPortStrings)
{
int connectRetVal;
struct sockaddr_storage proxyClientAddress;
socklen_t proxyClientAddressSize;
struct RemoteSocketResult result =
{
.status = REMOTE_SOCKET_ERROR,
.remoteSocket =
socket(proxySettings->remoteAddrInfo->ai_family,
proxySettings->remoteAddrInfo->ai_socktype,
proxySettings->remoteAddrInfo->ai_protocol)
};
if (result.remoteSocket < 0)
{
proxyLog("error creating remote socket errno = %d", errno);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
if (setFDNonBlocking(result.remoteSocket) < 0)
{
proxyLog("error setting non-blocking on remote socket");
signalSafeClose(result.remoteSocket);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
connectRetVal = connect(
result.remoteSocket,
proxySettings->remoteAddrInfo->ai_addr,
proxySettings->remoteAddrInfo->ai_addrlen);
if ((connectRetVal < 0) &&
((errno == EINPROGRESS) ||
(errno == EINTR)))
{
result.status = REMOTE_SOCKET_IN_PROGRESS;
}
else if (connectRetVal < 0)
{
char* socketErrorString = errnoToString(errno);
proxyLog("remote socket connect error errno = %d: %s",
errno, socketErrorString);
free(socketErrorString);
signalSafeClose(result.remoteSocket);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
else
{
result.status = REMOTE_SOCKET_CONNECTED;
}
if ((proxySettings->noDelay) && (setSocketNoDelay(result.remoteSocket) < 0))
{
proxyLog("error setting no delay on remote socket");
signalSafeClose(result.remoteSocket);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
proxyClientAddressSize = sizeof(proxyClientAddress);
if (getsockname(
result.remoteSocket,
(struct sockaddr*)&proxyClientAddress,
&proxyClientAddressSize) < 0)
{
proxyLog("getsockname error errno = %d", errno);
signalSafeClose(result.remoteSocket);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
if (addressToNameAndPort((struct sockaddr*)&proxyClientAddress,
proxyClientAddressSize,
proxyClientAddrPortStrings) < 0)
{
proxyLog("error getting proxy client address name and port");
signalSafeClose(result.remoteSocket);
result.status = REMOTE_SOCKET_ERROR;
result.remoteSocket = -1;
return result;
}
if (result.status != REMOTE_SOCKET_ERROR)
{
proxyLog("connect %s proxy to remote %s:%s -> %s:%s (fd=%d)",
((result.status == REMOTE_SOCKET_CONNECTED) ? "complete" : "starting"),
proxyClientAddrPortStrings->addrString,
proxyClientAddrPortStrings->portString,
proxySettings->remoteAddrPortStrings.addrString,
proxySettings->remoteAddrPortStrings.portString,
result.remoteSocket);
}
return result;
}
static void handleNewClientSocket(
int clientSocket,
const struct ProxySettings* proxySettings,
struct PollState* pollState,
struct BufferPool* connectionSocketInfoPool)
{
struct AddrPortStrings clientAddrPortStrings;
struct AddrPortStrings proxyServerAddrPortStrings;
struct AddrPortStrings proxyClientAddrPortStrings;
if (!setupClientSocket(
clientSocket,
proxySettings,
&clientAddrPortStrings,
&proxyServerAddrPortStrings))
{
signalSafeClose(clientSocket);
}
else
{
const struct RemoteSocketResult remoteSocketResult =
createRemoteSocket(proxySettings,
&proxyClientAddrPortStrings);
if (remoteSocketResult.status == REMOTE_SOCKET_ERROR)
{
signalSafeClose(clientSocket);
}
else
{
struct ConnectionSocketInfo* connInfo1;
struct ConnectionSocketInfo* connInfo2;
connInfo1 = getBufferFromBufferPool(connectionSocketInfoPool);
connInfo1->socket = clientSocket;
connInfo1->type = CLIENT_TO_PROXY;
connInfo1->waitingToWriteBufferOffset = 0;
connInfo1->waitingToWriteBufferSize = 0;
connInfo1->waitingToWriteBufferCapacity = proxySettings->bufferSize;
connInfo1->disconnectWhenWriteFinishes = false;
if (remoteSocketResult.status == REMOTE_SOCKET_CONNECTED)
{
connInfo1->waitingForConnect = false;
connInfo1->waitingForRead = true;
connInfo1->waitingForWrite = false;
}
else if (remoteSocketResult.status == REMOTE_SOCKET_IN_PROGRESS)
{
connInfo1->waitingForConnect = false;
connInfo1->waitingForRead = false;
connInfo1->waitingForWrite = false;
}
memcpy(&(connInfo1->clientAddrPortStrings),
&clientAddrPortStrings,
sizeof(struct AddrPortStrings));
memcpy(&(connInfo1->serverAddrPortStrings),
&proxyServerAddrPortStrings,
sizeof(struct AddrPortStrings));
connInfo2 = getBufferFromBufferPool(connectionSocketInfoPool);
connInfo2->socket = remoteSocketResult.remoteSocket;
connInfo2->type = PROXY_TO_REMOTE;
connInfo2->waitingToWriteBufferOffset = 0;
connInfo2->waitingToWriteBufferSize = 0;
connInfo2->waitingToWriteBufferCapacity = proxySettings->bufferSize;
connInfo2->disconnectWhenWriteFinishes = false;
if (remoteSocketResult.status == REMOTE_SOCKET_CONNECTED)
{
connInfo2->waitingForConnect = false;
connInfo2->waitingForRead = true;
connInfo2->waitingForWrite = false;
}
else if (remoteSocketResult.status == REMOTE_SOCKET_IN_PROGRESS)
{
connInfo2->waitingForConnect = true;
connInfo2->waitingForRead = false;
connInfo2->waitingForWrite = false;
}
memcpy(&(connInfo2->clientAddrPortStrings),
&proxyClientAddrPortStrings,
sizeof(struct AddrPortStrings));
memcpy(&(connInfo2->serverAddrPortStrings),
&(proxySettings->remoteAddrPortStrings),
sizeof(struct AddrPortStrings));
connInfo1->relatedConnectionSocketInfo = connInfo2;
connInfo2->relatedConnectionSocketInfo = connInfo1;
addConnectionSocketInfoToPollState(pollState, connInfo1);
addConnectionSocketInfoToPollState(pollState, connInfo2);
}
}
}
static void printDisconnectMessage(
const struct ConnectionSocketInfo* connectionSocketInfo)
{
proxyLog("disconnect %s %s:%s -> %s:%s (fd=%d)",
((connectionSocketInfo->type == CLIENT_TO_PROXY) ?
"client to proxy" :
"proxy to remote"),
connectionSocketInfo->clientAddrPortStrings.addrString,
connectionSocketInfo->clientAddrPortStrings.portString,
connectionSocketInfo->serverAddrPortStrings.addrString,
connectionSocketInfo->serverAddrPortStrings.portString,
connectionSocketInfo->socket);
}
static void destroyConnection(
struct ConnectionSocketInfo* connectionSocketInfo,
struct PollState* pollState,
struct BufferPool* connectionSocketInfoPool)
{
const int socket = connectionSocketInfo->socket;
struct ConnectionSocketInfo* relatedConnectionSocketInfo =
connectionSocketInfo->relatedConnectionSocketInfo;
printDisconnectMessage(connectionSocketInfo);
returnBufferToBufferPool(connectionSocketInfoPool, connectionSocketInfo);
removePollFDFromPollState(pollState, socket);
signalSafeClose(socket);
if (relatedConnectionSocketInfo)
{
relatedConnectionSocketInfo->relatedConnectionSocketInfo = NULL;
if (relatedConnectionSocketInfo->waitingForWrite)
{
relatedConnectionSocketInfo->disconnectWhenWriteFinishes = true;
relatedConnectionSocketInfo->waitingForRead = false;
updatePollStateForConnectionSocketInfo(
pollState, relatedConnectionSocketInfo);
}
else
{
destroyConnection(
relatedConnectionSocketInfo,
pollState,
connectionSocketInfoPool);
}
}
}
static struct ConnectionSocketInfo* handleConnectionReadyForError(
struct ConnectionSocketInfo* connectionSocketInfo)
{
struct ConnectionSocketInfo* pDisconnectSocketInfo = NULL;
const int socketError = getSocketError(connectionSocketInfo->socket);
if (socketError != 0)
{
char* socketErrorString = errnoToString(socketError);
pDisconnectSocketInfo = connectionSocketInfo;
proxyLog("fd %d errno %d: %s",
connectionSocketInfo->socket,
socketError,
socketErrorString);
free(socketErrorString);
}
return pDisconnectSocketInfo;
}
static struct ConnectionSocketInfo* handleConnectionReadyForRead(
struct ConnectionSocketInfo* connectionSocketInfo,
struct PollState* pollState)
{
struct ConnectionSocketInfo* pDisconnectSocketInfo = NULL;
struct ConnectionSocketInfo* relatedConnectionSocketInfo =
connectionSocketInfo->relatedConnectionSocketInfo;
if (connectionSocketInfo->waitingForRead)
{
bool readWouldBlock = false;
bool writeWouldBlock = false;
int numReads = 0;
assert(relatedConnectionSocketInfo != NULL);
while ((!pDisconnectSocketInfo) &&
(!readWouldBlock) &&
(!writeWouldBlock) &&
(numReads < MAX_OPERATIONS_FOR_ONE_FD))
{
const struct ReadFromFDResult readResult = readFromFD(
connectionSocketInfo->socket,
relatedConnectionSocketInfo->waitingToWriteBuffer,
relatedConnectionSocketInfo->waitingToWriteBufferCapacity);
++numReads;
if (readResult.status == READ_FROM_FD_WOULD_BLOCK)
{
readWouldBlock = true;
}
else if ((readResult.status == READ_FROM_FD_ERROR) ||
(readResult.status == READ_FROM_FD_EOF))
{
pDisconnectSocketInfo = connectionSocketInfo;
}
else
{
relatedConnectionSocketInfo->waitingToWriteBufferOffset = 0;
relatedConnectionSocketInfo->waitingToWriteBufferSize =
readResult.bytesRead;
while ((relatedConnectionSocketInfo->waitingToWriteBufferSize >
relatedConnectionSocketInfo->waitingToWriteBufferOffset) &&
(!pDisconnectSocketInfo) &&
(!writeWouldBlock))
{
const struct WriteToFDResult writeResult = writeToFD(
relatedConnectionSocketInfo->socket,
&(relatedConnectionSocketInfo->waitingToWriteBuffer[
relatedConnectionSocketInfo->waitingToWriteBufferOffset]),
relatedConnectionSocketInfo->waitingToWriteBufferSize -
relatedConnectionSocketInfo->waitingToWriteBufferOffset);
if (writeResult.status == WRITE_TO_FD_WOULD_BLOCK)
{
relatedConnectionSocketInfo->waitingForWrite = true;
updatePollStateForConnectionSocketInfo(pollState, relatedConnectionSocketInfo);
connectionSocketInfo->waitingForRead = false;
updatePollStateForConnectionSocketInfo(pollState, connectionSocketInfo);
writeWouldBlock = true;
}
else if (writeResult.status == WRITE_TO_FD_ERROR)
{
pDisconnectSocketInfo = relatedConnectionSocketInfo;
}
else
{
relatedConnectionSocketInfo->waitingToWriteBufferOffset +=
writeResult.bytesWritten;
}
}
}
}
}
return pDisconnectSocketInfo;
}
static struct ConnectionSocketInfo* handleConnectionReadyForWrite(
struct ConnectionSocketInfo* connectionSocketInfo,
struct PollState* pollState)
{
struct ConnectionSocketInfo* pDisconnectSocketInfo = NULL;
struct ConnectionSocketInfo* relatedConnectionSocketInfo =
connectionSocketInfo->relatedConnectionSocketInfo;
if (connectionSocketInfo->waitingForConnect)
{
int socketError;
assert(relatedConnectionSocketInfo != NULL);
socketError = getSocketError(connectionSocketInfo->socket);
if (socketError == 0)
{
proxyLog("connect complete proxy to remote %s:%s -> %s:%s (fd=%d)",
connectionSocketInfo->clientAddrPortStrings.addrString,
connectionSocketInfo->clientAddrPortStrings.portString,
connectionSocketInfo->serverAddrPortStrings.addrString,
connectionSocketInfo->serverAddrPortStrings.portString,
connectionSocketInfo->socket);
connectionSocketInfo->waitingForConnect = false;
connectionSocketInfo->waitingForRead = true;
updatePollStateForConnectionSocketInfo(pollState, connectionSocketInfo);
relatedConnectionSocketInfo->waitingForRead = true;
updatePollStateForConnectionSocketInfo(pollState, relatedConnectionSocketInfo);
}
else if (socketError == EINPROGRESS)
{
/* do nothing, still in progress */
}
else
{
char* socketErrorString = errnoToString(socketError);
proxyLog("async remote connect fd %d errno %d: %s",
connectionSocketInfo->socket,
socketError,
socketErrorString);
free(socketErrorString);
pDisconnectSocketInfo = connectionSocketInfo;
}
}
else if (connectionSocketInfo->waitingForWrite)
{
bool writeWouldBlock = false;
while ((connectionSocketInfo->waitingToWriteBufferSize >
connectionSocketInfo->waitingToWriteBufferOffset) &&
(!pDisconnectSocketInfo) &&
(!writeWouldBlock))
{
const struct WriteToFDResult writeResult = writeToFD(
connectionSocketInfo->socket,
&(connectionSocketInfo->waitingToWriteBuffer[
connectionSocketInfo->waitingToWriteBufferOffset]),
connectionSocketInfo->waitingToWriteBufferSize -
connectionSocketInfo->waitingToWriteBufferOffset);
if (writeResult.status == WRITE_TO_FD_WOULD_BLOCK)
{
writeWouldBlock = true;
}
else if (writeResult.status == WRITE_TO_FD_ERROR)
{
pDisconnectSocketInfo = connectionSocketInfo;
}
else
{
connectionSocketInfo->waitingToWriteBufferOffset +=
writeResult.bytesWritten;
}
}
if ((!pDisconnectSocketInfo) && (!writeWouldBlock))
{
if (connectionSocketInfo->disconnectWhenWriteFinishes)
{
pDisconnectSocketInfo = connectionSocketInfo;
}
else
{
assert(relatedConnectionSocketInfo != NULL);
connectionSocketInfo->waitingToWriteBufferOffset = 0;
connectionSocketInfo->waitingToWriteBufferSize = 0;
connectionSocketInfo->waitingForWrite = false;
updatePollStateForConnectionSocketInfo(pollState, connectionSocketInfo);
relatedConnectionSocketInfo->waitingForRead = true;
updatePollStateForConnectionSocketInfo(pollState, relatedConnectionSocketInfo);
}
}
}
return pDisconnectSocketInfo;
}
enum HandleConnectionReadyResult
{
POLL_STATE_INVALIDATED_RESULT,
POLL_STATE_NOT_INVALIDATED_RESULT
};
static enum HandleConnectionReadyResult handleConnectionReady(
const struct ReadyFDInfo* readyFDInfo,
struct ConnectionSocketInfo* connectionSocketInfo,
struct PollState* pollState,
struct BufferPool* connectionSocketInfoPool)
{
enum HandleConnectionReadyResult handleConnectionReadyResult =
POLL_STATE_NOT_INVALIDATED_RESULT;
struct ConnectionSocketInfo* pDisconnectSocketInfo = NULL;
#ifdef DEBUG_PROXY
proxyLog("fd %d readyForRead %d readyForWrite %d readyForError %d",
connectionSocketInfo->socket,
readyFDInfo->readyForRead,
readyFDInfo->readyForWrite,
readyFDInfo->readyForError);
#endif
if (readyFDInfo->readyForError &&
(!pDisconnectSocketInfo))
{
pDisconnectSocketInfo =
handleConnectionReadyForError(
connectionSocketInfo);
}
if (readyFDInfo->readyForRead &&
(!pDisconnectSocketInfo))
{
pDisconnectSocketInfo =
handleConnectionReadyForRead(
connectionSocketInfo,
pollState);
}
if (readyFDInfo->readyForWrite &&
(!pDisconnectSocketInfo))
{
pDisconnectSocketInfo =
handleConnectionReadyForWrite(
connectionSocketInfo,
pollState);
}
if (pDisconnectSocketInfo)
{
destroyConnection(
pDisconnectSocketInfo,
pollState,
connectionSocketInfoPool);
handleConnectionReadyResult = POLL_STATE_INVALIDATED_RESULT;
}
return handleConnectionReadyResult;
}
struct IOThreadReceiveFDInfo
{
int addClientMessageFD;
int receivedFD;
size_t receiveIndex;
};
static void handleAddClientMessageFDReady(
const struct ProxySettings* proxySettings,
struct IOThreadReceiveFDInfo* pIOThreadReceiveFDInfo,
struct PollState* pollState,
struct BufferPool* connectionSocketInfoPool)
{
bool readWouldBlock = false;
unsigned char* pCharBuffer =
(unsigned char*)(&(pIOThreadReceiveFDInfo->receivedFD));
do
{
size_t bytesToRead = sizeof(int) - pIOThreadReceiveFDInfo->receiveIndex;
const struct ReadFromFDResult readResult = readFromFD(
pIOThreadReceiveFDInfo->addClientMessageFD,
&(pCharBuffer[pIOThreadReceiveFDInfo->receiveIndex]),