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645 lines
16 KiB
645 lines
16 KiB
/*
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* httpd.c - a simple HTTP server
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*/
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/*
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* Copyright (C) 2002 RealVNC Ltd.
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* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <rfb/rfb.h>
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#include <ctype.h>
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#ifdef LIBVNCSERVER_HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef LIBVNCSERVER_HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <errno.h>
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#ifdef WIN32
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#include <winsock.h>
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#define close closesocket
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#else
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#ifdef LIBVNCSERVER_HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#endif
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#include <pwd.h>
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#endif
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#ifdef USE_LIBWRAP
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#include <tcpd.h>
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#endif
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#define NOT_FOUND_STR "HTTP/1.0 404 Not found\r\nConnection: close\r\n\r\n" \
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"<HEAD><TITLE>File Not Found</TITLE></HEAD>\n" \
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"<BODY><H1>File Not Found</H1></BODY>\n"
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#define INVALID_REQUEST_STR "HTTP/1.0 400 Invalid Request\r\nConnection: close\r\n\r\n" \
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"<HEAD><TITLE>Invalid Request</TITLE></HEAD>\n" \
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"<BODY><H1>Invalid request</H1></BODY>\n"
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#define OK_STR "HTTP/1.0 200 OK\r\nConnection: close\r\n\r\n"
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#define OK_STR_HTML "HTTP/1.0 200 OK\r\nConnection: close\r\nContent-Type: text/html\r\n\r\n"
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static void httpProcessInput(rfbScreenInfoPtr screen);
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static rfbBool compareAndSkip(char **ptr, const char *str);
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static rfbBool parseParams(const char *request, char *result, int max_bytes);
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static rfbBool validateString(char *str);
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#define BUF_SIZE 32768
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static char buf[BUF_SIZE];
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static size_t buf_filled=0;
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/*
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* httpInitSockets sets up the TCP socket to listen for HTTP connections.
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*/
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void
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rfbHttpInitSockets(rfbScreenInfoPtr rfbScreen)
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{
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if (rfbScreen->httpInitDone)
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return;
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rfbScreen->httpInitDone = TRUE;
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if (!rfbScreen->httpDir)
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return;
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if (rfbScreen->httpPort == 0) {
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rfbScreen->httpPort = rfbScreen->port-100;
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}
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if ((rfbScreen->httpListenSock =
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rfbListenOnTCPPort(rfbScreen->httpPort, rfbScreen->listenInterface)) < 0) {
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rfbLogPerror("ListenOnTCPPort");
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return;
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}
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rfbLog("Listening for HTTP connections on TCP port %d\n", rfbScreen->httpPort);
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rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->httpPort);
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#ifdef LIBVNCSERVER_IPv6
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if (rfbScreen->http6Port == 0) {
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rfbScreen->http6Port = rfbScreen->ipv6port-100;
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}
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if ((rfbScreen->httpListen6Sock
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= rfbListenOnTCP6Port(rfbScreen->http6Port, rfbScreen->listen6Interface)) < 0) {
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/* ListenOnTCP6Port has its own detailed error printout */
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return;
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}
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rfbLog("Listening for HTTP connections on TCP6 port %d\n", rfbScreen->http6Port);
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rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->http6Port);
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#endif
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}
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void rfbHttpShutdownSockets(rfbScreenInfoPtr rfbScreen) {
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if(rfbScreen->httpSock>-1) {
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close(rfbScreen->httpSock);
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FD_CLR(rfbScreen->httpSock,&rfbScreen->allFds);
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rfbScreen->httpSock=-1;
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}
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if(rfbScreen->httpListenSock>-1) {
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close(rfbScreen->httpListenSock);
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FD_CLR(rfbScreen->httpListenSock,&rfbScreen->allFds);
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rfbScreen->httpListenSock=-1;
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}
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if(rfbScreen->httpListen6Sock>-1) {
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close(rfbScreen->httpListen6Sock);
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FD_CLR(rfbScreen->httpListen6Sock,&rfbScreen->allFds);
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rfbScreen->httpListen6Sock=-1;
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}
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}
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/*
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* httpCheckFds is called from ProcessInputEvents to check for input on the
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* HTTP socket(s). If there is input to process, httpProcessInput is called.
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*/
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void
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rfbHttpCheckFds(rfbScreenInfoPtr rfbScreen)
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{
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int nfds;
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fd_set fds;
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struct timeval tv;
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#ifdef LIBVNCSERVER_IPv6
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struct sockaddr_storage addr;
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#else
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struct sockaddr_in addr;
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#endif
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socklen_t addrlen = sizeof(addr);
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if (!rfbScreen->httpDir)
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return;
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if (rfbScreen->httpListenSock < 0)
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return;
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FD_ZERO(&fds);
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FD_SET(rfbScreen->httpListenSock, &fds);
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if (rfbScreen->httpListen6Sock >= 0) {
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FD_SET(rfbScreen->httpListen6Sock, &fds);
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}
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if (rfbScreen->httpSock >= 0) {
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FD_SET(rfbScreen->httpSock, &fds);
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}
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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nfds = select(max(rfbScreen->httpListen6Sock, max(rfbScreen->httpSock,rfbScreen->httpListenSock)) + 1, &fds, NULL, NULL, &tv);
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if (nfds == 0) {
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return;
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}
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if (nfds < 0) {
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#ifdef WIN32
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errno = WSAGetLastError();
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#endif
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if (errno != EINTR)
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rfbLogPerror("httpCheckFds: select");
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return;
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}
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if ((rfbScreen->httpSock >= 0) && FD_ISSET(rfbScreen->httpSock, &fds)) {
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httpProcessInput(rfbScreen);
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}
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if (FD_ISSET(rfbScreen->httpListenSock, &fds) || FD_ISSET(rfbScreen->httpListen6Sock, &fds)) {
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if (rfbScreen->httpSock >= 0) close(rfbScreen->httpSock);
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if(FD_ISSET(rfbScreen->httpListenSock, &fds)) {
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if ((rfbScreen->httpSock = accept(rfbScreen->httpListenSock, (struct sockaddr *)&addr, &addrlen)) < 0) {
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rfbLogPerror("httpCheckFds: accept");
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return;
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}
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}
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else if(FD_ISSET(rfbScreen->httpListen6Sock, &fds)) {
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if ((rfbScreen->httpSock = accept(rfbScreen->httpListen6Sock, (struct sockaddr *)&addr, &addrlen)) < 0) {
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rfbLogPerror("httpCheckFds: accept");
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return;
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}
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}
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#ifdef USE_LIBWRAP
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char host[1024];
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#ifdef LIBVNCSERVER_IPv6
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if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) {
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rfbLogPerror("httpCheckFds: error in getnameinfo");
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host[0] = '\0';
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}
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#else
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memcpy(host, inet_ntoa(addr.sin_addr), sizeof(host));
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#endif
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if(!hosts_ctl("vnc",STRING_UNKNOWN, host,
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STRING_UNKNOWN)) {
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rfbLog("Rejected HTTP connection from client %s\n",
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host);
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close(rfbScreen->httpSock);
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rfbScreen->httpSock=-1;
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return;
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}
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#endif
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if(!rfbSetNonBlocking(rfbScreen->httpSock)) {
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close(rfbScreen->httpSock);
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rfbScreen->httpSock=-1;
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return;
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}
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/*AddEnabledDevice(httpSock);*/
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}
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}
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static void
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httpCloseSock(rfbScreenInfoPtr rfbScreen)
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{
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close(rfbScreen->httpSock);
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rfbScreen->httpSock = -1;
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buf_filled = 0;
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}
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static rfbClientRec cl;
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/*
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* httpProcessInput is called when input is received on the HTTP socket.
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*/
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static void
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httpProcessInput(rfbScreenInfoPtr rfbScreen)
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{
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#ifdef LIBVNCSERVER_IPv6
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struct sockaddr_storage addr;
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#else
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struct sockaddr_in addr;
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#endif
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socklen_t addrlen = sizeof(addr);
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char fullFname[512];
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char params[1024];
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char *ptr;
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char *fname;
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unsigned int maxFnameLen;
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FILE* fd;
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rfbBool performSubstitutions = FALSE;
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char str[256+32];
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#ifndef WIN32
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char* user=getenv("USER");
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#endif
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cl.sock=rfbScreen->httpSock;
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if (strlen(rfbScreen->httpDir) > 255) {
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rfbErr("-httpd directory too long\n");
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httpCloseSock(rfbScreen);
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return;
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}
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strcpy(fullFname, rfbScreen->httpDir);
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fname = &fullFname[strlen(fullFname)];
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maxFnameLen = 511 - strlen(fullFname);
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buf_filled=0;
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/* Read data from the HTTP client until we get a complete request. */
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while (1) {
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ssize_t got;
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if (buf_filled > sizeof (buf)) {
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rfbErr("httpProcessInput: HTTP request is too long\n");
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httpCloseSock(rfbScreen);
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return;
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}
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got = read (rfbScreen->httpSock, buf + buf_filled,
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sizeof (buf) - buf_filled - 1);
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if (got <= 0) {
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if (got == 0) {
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rfbErr("httpd: premature connection close\n");
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} else {
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#ifdef WIN32
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errno=WSAGetLastError();
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#endif
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if (errno == EAGAIN) {
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return;
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}
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rfbLogPerror("httpProcessInput: read");
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}
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httpCloseSock(rfbScreen);
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return;
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}
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buf_filled += got;
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buf[buf_filled] = '\0';
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/* Is it complete yet (is there a blank line)? */
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if (strstr (buf, "\r\r") || strstr (buf, "\n\n") ||
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strstr (buf, "\r\n\r\n") || strstr (buf, "\n\r\n\r"))
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break;
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}
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/* Process the request. */
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if(rfbScreen->httpEnableProxyConnect) {
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const static char* PROXY_OK_STR = "HTTP/1.0 200 OK\r\nContent-Type: octet-stream\r\nPragma: no-cache\r\n\r\n";
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if(!strncmp(buf, "CONNECT ", 8)) {
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if(atoi(strchr(buf, ':')+1)!=rfbScreen->port) {
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rfbErr("httpd: CONNECT format invalid.\n");
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rfbWriteExact(&cl,INVALID_REQUEST_STR, strlen(INVALID_REQUEST_STR));
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httpCloseSock(rfbScreen);
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return;
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}
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/* proxy connection */
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rfbLog("httpd: client asked for CONNECT\n");
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rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR));
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rfbNewClientConnection(rfbScreen,rfbScreen->httpSock);
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rfbScreen->httpSock = -1;
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return;
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}
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if (!strncmp(buf, "GET ",4) && !strncmp(strchr(buf,'/'),"/proxied.connection HTTP/1.", 27)) {
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/* proxy connection */
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rfbLog("httpd: client asked for /proxied.connection\n");
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rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR));
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rfbNewClientConnection(rfbScreen,rfbScreen->httpSock);
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rfbScreen->httpSock = -1;
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return;
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}
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}
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if (strncmp(buf, "GET ", 4)) {
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rfbErr("httpd: no GET line\n");
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httpCloseSock(rfbScreen);
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return;
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} else {
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/* Only use the first line. */
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buf[strcspn(buf, "\n\r")] = '\0';
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}
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if (strlen(buf) > maxFnameLen) {
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rfbErr("httpd: GET line too long\n");
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httpCloseSock(rfbScreen);
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return;
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}
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if (sscanf(buf, "GET %s HTTP/1.", fname) != 1) {
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rfbErr("httpd: couldn't parse GET line\n");
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httpCloseSock(rfbScreen);
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return;
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}
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if (fname[0] != '/') {
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rfbErr("httpd: filename didn't begin with '/'\n");
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rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
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httpCloseSock(rfbScreen);
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return;
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}
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getpeername(rfbScreen->httpSock, (struct sockaddr *)&addr, &addrlen);
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#ifdef LIBVNCSERVER_IPv6
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char host[1024];
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if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) {
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rfbLogPerror("httpProcessInput: error in getnameinfo");
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}
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rfbLog("httpd: get '%s' for %s\n", fname+1, host);
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#else
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rfbLog("httpd: get '%s' for %s\n", fname+1,
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inet_ntoa(addr.sin_addr));
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#endif
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/* Extract parameters from the URL string if necessary */
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params[0] = '\0';
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ptr = strchr(fname, '?');
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if (ptr != NULL) {
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*ptr = '\0';
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if (!parseParams(&ptr[1], params, 1024)) {
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params[0] = '\0';
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rfbErr("httpd: bad parameters in the URL\n");
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}
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}
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/* If we were asked for '/', actually read the file index.vnc */
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if (strcmp(fname, "/") == 0) {
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strcpy(fname, "/index.vnc");
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rfbLog("httpd: defaulting to '%s'\n", fname+1);
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}
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/* Substitutions are performed on files ending .vnc */
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if (strlen(fname) >= 4 && strcmp(&fname[strlen(fname)-4], ".vnc") == 0) {
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performSubstitutions = TRUE;
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}
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/* Open the file */
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if ((fd = fopen(fullFname, "r")) == 0) {
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rfbLogPerror("httpProcessInput: open");
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rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
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httpCloseSock(rfbScreen);
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return;
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}
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if(performSubstitutions) /* is the 'index.vnc' file */
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rfbWriteExact(&cl, OK_STR_HTML, strlen(OK_STR_HTML));
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else
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rfbWriteExact(&cl, OK_STR, strlen(OK_STR));
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while (1) {
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int n = fread(buf, 1, BUF_SIZE-1, fd);
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if (n < 0) {
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rfbLogPerror("httpProcessInput: read");
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fclose(fd);
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httpCloseSock(rfbScreen);
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return;
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}
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if (n == 0)
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break;
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if (performSubstitutions) {
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/* Substitute $WIDTH, $HEIGHT, etc with the appropriate values.
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This won't quite work properly if the .vnc file is longer than
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BUF_SIZE, but it's reasonable to assume that .vnc files will
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always be short. */
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char *ptr = buf;
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char *dollar;
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buf[n] = 0; /* make sure it's null-terminated */
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while ((dollar = strchr(ptr, '$'))!=NULL) {
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rfbWriteExact(&cl, ptr, (dollar - ptr));
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ptr = dollar;
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if (compareAndSkip(&ptr, "$WIDTH")) {
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sprintf(str, "%d", rfbScreen->width);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$HEIGHT")) {
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sprintf(str, "%d", rfbScreen->height);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$APPLETWIDTH")) {
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sprintf(str, "%d", rfbScreen->width);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$APPLETHEIGHT")) {
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sprintf(str, "%d", rfbScreen->height + 32);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$PORT")) {
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sprintf(str, "%d", rfbScreen->port);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$DESKTOP")) {
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rfbWriteExact(&cl, rfbScreen->desktopName, strlen(rfbScreen->desktopName));
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} else if (compareAndSkip(&ptr, "$DISPLAY")) {
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sprintf(str, "%s:%d", rfbScreen->thisHost, rfbScreen->port-5900);
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rfbWriteExact(&cl, str, strlen(str));
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} else if (compareAndSkip(&ptr, "$USER")) {
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#ifndef WIN32
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if (user) {
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rfbWriteExact(&cl, user,
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strlen(user));
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} else
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#endif
|
|
rfbWriteExact(&cl, "?", 1);
|
|
} else if (compareAndSkip(&ptr, "$PARAMS")) {
|
|
if (params[0] != '\0')
|
|
rfbWriteExact(&cl, params, strlen(params));
|
|
} else {
|
|
if (!compareAndSkip(&ptr, "$$"))
|
|
ptr++;
|
|
|
|
if (rfbWriteExact(&cl, "$", 1) < 0) {
|
|
fclose(fd);
|
|
httpCloseSock(rfbScreen);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
if (rfbWriteExact(&cl, ptr, (&buf[n] - ptr)) < 0)
|
|
break;
|
|
|
|
} else {
|
|
|
|
/* For files not ending .vnc, just write out the buffer */
|
|
|
|
if (rfbWriteExact(&cl, buf, n) < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
fclose(fd);
|
|
httpCloseSock(rfbScreen);
|
|
}
|
|
|
|
|
|
static rfbBool
|
|
compareAndSkip(char **ptr, const char *str)
|
|
{
|
|
if (strncmp(*ptr, str, strlen(str)) == 0) {
|
|
*ptr += strlen(str);
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* Parse the request tail after the '?' character, and format a sequence
|
|
* of <param> tags for inclusion into an HTML page with embedded applet.
|
|
*/
|
|
|
|
static rfbBool
|
|
parseParams(const char *request, char *result, int max_bytes)
|
|
{
|
|
char param_request[128];
|
|
char param_formatted[196];
|
|
const char *tail;
|
|
char *delim_ptr;
|
|
char *value_str;
|
|
int cur_bytes, len;
|
|
|
|
result[0] = '\0';
|
|
cur_bytes = 0;
|
|
|
|
tail = request;
|
|
for (;;) {
|
|
/* Copy individual "name=value" string into a buffer */
|
|
delim_ptr = strchr((char *)tail, '&');
|
|
if (delim_ptr == NULL) {
|
|
if (strlen(tail) >= sizeof(param_request)) {
|
|
return FALSE;
|
|
}
|
|
strcpy(param_request, tail);
|
|
} else {
|
|
len = delim_ptr - tail;
|
|
if (len >= sizeof(param_request)) {
|
|
return FALSE;
|
|
}
|
|
memcpy(param_request, tail, len);
|
|
param_request[len] = '\0';
|
|
}
|
|
|
|
/* Split the request into parameter name and value */
|
|
value_str = strchr(¶m_request[1], '=');
|
|
if (value_str == NULL) {
|
|
return FALSE;
|
|
}
|
|
*value_str++ = '\0';
|
|
if (strlen(value_str) == 0) {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Validate both parameter name and value */
|
|
if (!validateString(param_request) || !validateString(value_str)) {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Prepare HTML-formatted representation of the name=value pair */
|
|
len = sprintf(param_formatted,
|
|
"<PARAM NAME=\"%s\" VALUE=\"%s\">\n",
|
|
param_request, value_str);
|
|
if (cur_bytes + len + 1 > max_bytes) {
|
|
return FALSE;
|
|
}
|
|
strcat(result, param_formatted);
|
|
cur_bytes += len;
|
|
|
|
/* Go to the next parameter */
|
|
if (delim_ptr == NULL) {
|
|
break;
|
|
}
|
|
tail = delim_ptr + 1;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Check if the string consists only of alphanumeric characters, '+'
|
|
* signs, underscores, dots, colons and square brackets.
|
|
* Replace all '+' signs with spaces.
|
|
*/
|
|
|
|
static rfbBool
|
|
validateString(char *str)
|
|
{
|
|
char *ptr;
|
|
|
|
for (ptr = str; *ptr != '\0'; ptr++) {
|
|
if (!isalnum(*ptr) && *ptr != '_' && *ptr != '.'
|
|
&& *ptr != ':' && *ptr != '[' && *ptr != ']' ) {
|
|
if (*ptr == '+') {
|
|
*ptr = ' ';
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|