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-rwxr-xr-xlibvncserver/sockets.c619
1 files changed, 619 insertions, 0 deletions
diff --git a/libvncserver/sockets.c b/libvncserver/sockets.c
new file mode 100755
index 0000000..cea1898
--- /dev/null
+++ b/libvncserver/sockets.c
@@ -0,0 +1,619 @@
+/*
+ * sockets.c - deal with TCP & UDP sockets.
+ *
+ * This code should be independent of any changes in the RFB protocol. It just
+ * deals with the X server scheduling stuff, calling rfbNewClientConnection and
+ * rfbProcessClientMessage to actually deal with the protocol. If a socket
+ * needs to be closed for any reason then rfbCloseClient should be called, and
+ * this in turn will call rfbClientConnectionGone. To make an active
+ * connection out, call rfbConnect - note that this does _not_ call
+ * rfbNewClientConnection.
+ *
+ * This file is divided into two types of function. Those beginning with
+ * "rfb" are specific to sockets using the RFB protocol. Those without the
+ * "rfb" prefix are more general socket routines (which are used by the http
+ * code).
+ *
+ * Thanks to Karl Hakimian for pointing out that some platforms return EAGAIN
+ * not EWOULDBLOCK.
+ */
+
+/*
+ * OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
+ * Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge.
+ * All Rights Reserved.
+ *
+ * This 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.
+ *
+ * This software 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 this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+#include <rfb/rfb.h>
+
+#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef WIN32
+#pragma warning (disable: 4018 4761)
+#define close closesocket
+#define read(sock,buf,len) recv(sock,buf,len,0)
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#define ETIMEDOUT WSAETIMEDOUT
+#define write(sock,buf,len) send(sock,buf,len,0)
+#else
+#ifdef LIBVNCSERVER_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#endif
+
+#if defined(__linux__) && defined(NEED_TIMEVAL)
+struct timeval
+{
+ long int tv_sec,tv_usec;
+}
+;
+#endif
+
+#ifdef LIBVNCSERVER_HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include <errno.h>
+
+#ifdef USE_LIBWRAP
+#include <syslog.h>
+#include <tcpd.h>
+int allow_severity=LOG_INFO;
+int deny_severity=LOG_WARNING;
+#endif
+
+/*#ifndef WIN32
+int max(int i,int j) { return(i<j?j:i); }
+#endif
+*/
+
+int rfbMaxClientWait = 20000; /* time (ms) after which we decide client has
+ gone away - needed to stop us hanging */
+
+/*
+ * rfbInitSockets sets up the TCP and UDP sockets to listen for RFB
+ * connections. It does nothing if called again.
+ */
+
+void
+rfbInitSockets(rfbScreenInfoPtr rfbScreen)
+{
+ if (rfbScreen->socketInitDone)
+ return;
+
+ rfbScreen->socketInitDone = TRUE;
+
+ if (rfbScreen->inetdSock != -1) {
+ const int one = 1;
+
+#ifndef WIN32
+ if (fcntl(rfbScreen->inetdSock, F_SETFL, O_NONBLOCK) < 0) {
+ rfbLogPerror("fcntl");
+ return;
+ }
+#endif
+
+ if (setsockopt(rfbScreen->inetdSock, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&one, sizeof(one)) < 0) {
+ rfbLogPerror("setsockopt");
+ return;
+ }
+
+ FD_ZERO(&(rfbScreen->allFds));
+ FD_SET(rfbScreen->inetdSock, &(rfbScreen->allFds));
+ rfbScreen->maxFd = rfbScreen->inetdSock;
+ return;
+ }
+
+ if(rfbScreen->autoPort) {
+ int i;
+ rfbLog("Autoprobing TCP port \n");
+
+ for (i = 5900; i < 6000; i++) {
+ if ((rfbScreen->rfbListenSock = ListenOnTCPPort(i)) >= 0) {
+ rfbScreen->rfbPort = i;
+ break;
+ }
+ }
+
+ if (i >= 6000) {
+ rfbLogPerror("Failure autoprobing");
+ return;
+ }
+
+ rfbLog("Autoprobing selected port %d\n", rfbScreen->rfbPort);
+ FD_ZERO(&(rfbScreen->allFds));
+ FD_SET(rfbScreen->rfbListenSock, &(rfbScreen->allFds));
+ rfbScreen->maxFd = rfbScreen->rfbListenSock;
+ }
+ else if(rfbScreen->rfbPort>0) {
+ rfbLog("Listening for VNC connections on TCP port %d\n", rfbScreen->rfbPort);
+
+ if ((rfbScreen->rfbListenSock = ListenOnTCPPort(rfbScreen->rfbPort)) < 0) {
+ rfbLogPerror("ListenOnTCPPort");
+ return;
+ }
+
+ FD_ZERO(&(rfbScreen->allFds));
+ FD_SET(rfbScreen->rfbListenSock, &(rfbScreen->allFds));
+ rfbScreen->maxFd = rfbScreen->rfbListenSock;
+ }
+
+ if (rfbScreen->udpPort != 0) {
+ rfbLog("rfbInitSockets: listening for input on UDP port %d\n",rfbScreen->udpPort);
+
+ if ((rfbScreen->udpSock = ListenOnUDPPort(rfbScreen->udpPort)) < 0) {
+ rfbLogPerror("ListenOnUDPPort");
+ return;
+ }
+ FD_SET(rfbScreen->udpSock, &(rfbScreen->allFds));
+ rfbScreen->maxFd = max((int)rfbScreen->udpSock,rfbScreen->maxFd);
+ }
+}
+
+
+/*
+ * rfbCheckFds is called from ProcessInputEvents to check for input on the RFB
+ * socket(s). If there is input to process, the appropriate function in the
+ * RFB server code will be called (rfbNewClientConnection,
+ * rfbProcessClientMessage, etc).
+ */
+
+void
+rfbCheckFds(rfbScreenInfoPtr rfbScreen,long usec)
+{
+ int nfds;
+ fd_set fds;
+ struct timeval tv;
+ struct sockaddr_in addr;
+ size_t addrlen = sizeof(addr);
+ char buf[6];
+ const int one = 1;
+ int sock;
+ rfbClientIteratorPtr i;
+ rfbClientPtr cl;
+
+ if (!rfbScreen->inetdInitDone && rfbScreen->inetdSock != -1) {
+ rfbNewClientConnection(rfbScreen,rfbScreen->inetdSock);
+ rfbScreen->inetdInitDone = TRUE;
+ }
+
+ memcpy((char *)&fds, (char *)&(rfbScreen->allFds), sizeof(fd_set));
+ tv.tv_sec = 0;
+ tv.tv_usec = usec;
+ nfds = select(rfbScreen->maxFd + 1, &fds, NULL, NULL /* &fds */, &tv);
+ if (nfds == 0) {
+ return;
+ }
+ if (nfds < 0) {
+#ifdef WIN32
+ errno = WSAGetLastError();
+#endif
+ if (errno != EINTR)
+ rfbLogPerror("rfbCheckFds: select");
+ return;
+ }
+
+ if (rfbScreen->rfbListenSock != -1 && FD_ISSET(rfbScreen->rfbListenSock, &fds)) {
+
+ if ((sock = accept(rfbScreen->rfbListenSock,
+ (struct sockaddr *)&addr, &addrlen)) < 0) {
+ rfbLogPerror("rfbCheckFds: accept");
+ return;
+ }
+
+#ifndef WIN32
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
+ rfbLogPerror("rfbCheckFds: fcntl");
+ close(sock);
+ return;
+ }
+#endif
+
+ if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&one, sizeof(one)) < 0) {
+ rfbLogPerror("rfbCheckFds: setsockopt");
+ close(sock);
+ return;
+ }
+
+#ifdef USE_LIBWRAP
+ if(!hosts_ctl("vnc",STRING_UNKNOWN,inet_ntoa(addr.sin_addr),
+ STRING_UNKNOWN)) {
+ rfbLog("Rejected connection from client %s\n",
+ inet_ntoa(addr.sin_addr));
+ close(sock);
+ return;
+ }
+#endif
+
+ rfbLog("Got connection from client %s\n", inet_ntoa(addr.sin_addr));
+
+ rfbNewClient(rfbScreen,sock);
+
+ FD_CLR(rfbScreen->rfbListenSock, &fds);
+ if (--nfds == 0)
+ return;
+ }
+
+ if ((rfbScreen->udpSock != -1) && FD_ISSET(rfbScreen->udpSock, &fds)) {
+ if(!rfbScreen->udpClient)
+ rfbNewUDPClient(rfbScreen);
+ if (recvfrom(rfbScreen->udpSock, buf, 1, MSG_PEEK,
+ (struct sockaddr *)&addr, &addrlen) < 0) {
+ rfbLogPerror("rfbCheckFds: UDP: recvfrom");
+ rfbDisconnectUDPSock(rfbScreen);
+ rfbScreen->udpSockConnected = FALSE;
+ } else {
+ if (!rfbScreen->udpSockConnected ||
+ (memcmp(&addr, &rfbScreen->udpRemoteAddr, addrlen) != 0))
+ {
+ /* new remote end */
+ rfbLog("rfbCheckFds: UDP: got connection\n");
+
+ memcpy(&rfbScreen->udpRemoteAddr, &addr, addrlen);
+ rfbScreen->udpSockConnected = TRUE;
+
+ if (connect(rfbScreen->udpSock,
+ (struct sockaddr *)&addr, addrlen) < 0) {
+ rfbLogPerror("rfbCheckFds: UDP: connect");
+ rfbDisconnectUDPSock(rfbScreen);
+ return;
+ }
+
+ rfbNewUDPConnection(rfbScreen,rfbScreen->udpSock);
+ }
+
+ rfbProcessUDPInput(rfbScreen);
+ }
+
+ FD_CLR(rfbScreen->udpSock, &fds);
+ if (--nfds == 0)
+ return;
+ }
+
+ i = rfbGetClientIterator(rfbScreen);
+ while((cl = rfbClientIteratorNext(i))) {
+ if (cl->onHold)
+ continue;
+ if (FD_ISSET(cl->sock, &fds) && FD_ISSET(cl->sock, &(rfbScreen->allFds)))
+ rfbProcessClientMessage(cl);
+ }
+ rfbReleaseClientIterator(i);
+}
+
+
+void
+rfbDisconnectUDPSock(rfbScreenInfoPtr rfbScreen)
+{
+ rfbScreen->udpSockConnected = FALSE;
+}
+
+
+
+void
+rfbCloseClient(cl)
+ rfbClientPtr cl;
+{
+ LOCK(cl->updateMutex);
+#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
+ if (cl->sock != -1)
+#endif
+ {
+ FD_CLR(cl->sock,&(cl->screen->allFds));
+ if(cl->sock==cl->screen->maxFd)
+ while(cl->screen->maxFd>0
+ && !FD_ISSET(cl->screen->maxFd,&(cl->screen->allFds)))
+ cl->screen->maxFd--;
+ shutdown(cl->sock,SHUT_RDWR);
+ close(cl->sock);
+ cl->sock = -1;
+ }
+ TSIGNAL(cl->updateCond);
+ UNLOCK(cl->updateMutex);
+}
+
+
+/*
+ * rfbConnect is called to make a connection out to a given TCP address.
+ */
+
+int
+rfbConnect(rfbScreen, host, port)
+ rfbScreenInfoPtr rfbScreen;
+ char *host;
+ int port;
+{
+ int sock;
+ int one = 1;
+
+ rfbLog("Making connection to client on host %s port %d\n",
+ host,port);
+
+ if ((sock = ConnectToTcpAddr(host, port)) < 0) {
+ rfbLogPerror("connection failed");
+ return -1;
+ }
+
+#ifndef WIN32
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
+ rfbLogPerror("fcntl failed");
+ close(sock);
+ return -1;
+ }
+#endif
+
+ if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&one, sizeof(one)) < 0) {
+ rfbLogPerror("setsockopt failed");
+ close(sock);
+ return -1;
+ }
+
+ /* AddEnabledDevice(sock); */
+ FD_SET(sock, &rfbScreen->allFds);
+ rfbScreen->maxFd = max(sock,rfbScreen->maxFd);
+
+ return sock;
+}
+
+/*
+ * ReadExact reads an exact number of bytes from a client. Returns 1 if
+ * those bytes have been read, 0 if the other end has closed, or -1 if an error
+ * occurred (errno is set to ETIMEDOUT if it timed out).
+ */
+
+int
+ReadExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
+{
+ int sock = cl->sock;
+ int n;
+ fd_set fds;
+ struct timeval tv;
+
+ while (len > 0) {
+ n = read(sock, buf, len);
+
+ if (n > 0) {
+
+ buf += n;
+ len -= n;
+
+ } else if (n == 0) {
+
+ return 0;
+
+ } else {
+#ifdef WIN32
+ errno = WSAGetLastError();
+#endif
+ if (errno == EINTR)
+ continue;
+
+ if (errno != EWOULDBLOCK && errno != EAGAIN) {
+ return n;
+ }
+
+ FD_ZERO(&fds);
+ FD_SET(sock, &fds);
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000) * 1000;
+ n = select(sock+1, &fds, NULL, &fds, &tv);
+ if (n < 0) {
+ rfbLogPerror("ReadExact: select");
+ return n;
+ }
+ if (n == 0) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ }
+ }
+ return 1;
+}
+
+int ReadExact(rfbClientPtr cl,char* buf,int len)
+{
+ return(ReadExactTimeout(cl,buf,len,rfbMaxClientWait));
+}
+
+/*
+ * WriteExact writes an exact number of bytes to a client. Returns 1 if
+ * those bytes have been written, or -1 if an error occurred (errno is set to
+ * ETIMEDOUT if it timed out).
+ */
+
+int
+WriteExact(cl, buf, len)
+ rfbClientPtr cl;
+ const char *buf;
+ int len;
+{
+ int sock = cl->sock;
+ int n;
+ fd_set fds;
+ struct timeval tv;
+ int totalTimeWaited = 0;
+
+ LOCK(cl->outputMutex);
+ while (len > 0) {
+ n = write(sock, buf, len);
+
+ if (n > 0) {
+
+ buf += n;
+ len -= n;
+
+ } else if (n == 0) {
+
+ rfbErr("WriteExact: write returned 0?\n");
+ return 0;
+
+ } else {
+#ifdef WIN32
+ errno = WSAGetLastError();
+#endif
+ if (errno == EINTR)
+ continue;
+
+ if (errno != EWOULDBLOCK && errno != EAGAIN) {
+ UNLOCK(cl->outputMutex);
+ return n;
+ }
+
+ /* Retry every 5 seconds until we exceed rfbMaxClientWait. We
+ need to do this because select doesn't necessarily return
+ immediately when the other end has gone away */
+
+ FD_ZERO(&fds);
+ FD_SET(sock, &fds);
+ tv.tv_sec = 5;
+ tv.tv_usec = 0;
+ n = select(sock+1, NULL, &fds, NULL /* &fds */, &tv);
+ if (n < 0) {
+ if(errno==EINTR)
+ continue;
+ rfbLogPerror("WriteExact: select");
+ UNLOCK(cl->outputMutex);
+ return n;
+ }
+ if (n == 0) {
+ totalTimeWaited += 5000;
+ if (totalTimeWaited >= rfbMaxClientWait) {
+ errno = ETIMEDOUT;
+ UNLOCK(cl->outputMutex);
+ return -1;
+ }
+ } else {
+ totalTimeWaited = 0;
+ }
+ }
+ }
+ UNLOCK(cl->outputMutex);
+ return 1;
+}
+
+int
+ListenOnTCPPort(port)
+ int port;
+{
+ struct sockaddr_in addr;
+ int sock;
+ int one = 1;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ /* addr.sin_addr.s_addr = interface.s_addr; */
+ addr.sin_addr.s_addr = INADDR_ANY;
+
+ if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+ return -1;
+ }
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
+ (char *)&one, sizeof(one)) < 0) {
+ close(sock);
+ return -1;
+ }
+ if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ close(sock);
+ return -1;
+ }
+ if (listen(sock, 5) < 0) {
+ close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+
+int
+ConnectToTcpAddr(host, port)
+ char *host;
+ int port;
+{
+ struct hostent *hp;
+ int sock;
+ struct sockaddr_in addr;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+
+ if ((addr.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE)
+ {
+ if (!(hp = gethostbyname(host))) {
+ errno = EINVAL;
+ return -1;
+ }
+ addr.sin_addr.s_addr = *(unsigned long *)hp->h_addr;
+ }
+
+ if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+ return -1;
+ }
+
+ if (connect(sock, (struct sockaddr *)&addr, (sizeof(addr))) < 0) {
+ close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+
+int
+ListenOnUDPPort(port)
+ int port;
+{
+ struct sockaddr_in addr;
+ int sock;
+ int one = 1;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ /* addr.sin_addr.s_addr = interface.s_addr; */
+ addr.sin_addr.s_addr = INADDR_ANY;
+
+ if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ return -1;
+ }
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
+ (char *)&one, sizeof(one)) < 0) {
+ return -1;
+ }
+ if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ return -1;
+ }
+
+ return sock;
+}
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