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-rwxr-xr-xlibvncserver/httpd.c579
1 files changed, 579 insertions, 0 deletions
diff --git a/libvncserver/httpd.c b/libvncserver/httpd.c
new file mode 100755
index 0000000..85c8e44
--- /dev/null
+++ b/libvncserver/httpd.c
@@ -0,0 +1,579 @@
+/*
+ * httpd.c - a simple HTTP server
+ */
+
+/*
+ * Copyright (C) 2002 RealVNC Ltd.
+ * 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>
+
+#include <ctype.h>
+#ifdef LIBVNCSERVER_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#include <errno.h>
+
+#ifdef WIN32
+#include <winsock.h>
+#define close closesocket
+#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
+#include <pwd.h>
+#endif
+
+#ifdef USE_LIBWRAP
+#include <tcpd.h>
+#endif
+
+#define NOT_FOUND_STR "HTTP/1.0 404 Not found\r\n\r\n" \
+ "<HEAD><TITLE>File Not Found</TITLE></HEAD>\n" \
+ "<BODY><H1>File Not Found</H1></BODY>\n"
+
+#define INVALID_REQUEST_STR "HTTP/1.0 400 Invalid Request\r\n\r\n" \
+ "<HEAD><TITLE>Invalid Request</TITLE></HEAD>\n" \
+ "<BODY><H1>Invalid request</H1></BODY>\n"
+
+#define OK_STR "HTTP/1.0 200 OK\nContent-Type: text/html\r\n\r\n"
+
+static void httpProcessInput();
+static rfbBool compareAndSkip(char **ptr, const char *str);
+static rfbBool parseParams(const char *request, char *result, int max_bytes);
+static rfbBool validateString(char *str);
+
+#define BUF_SIZE 32768
+
+static char buf[BUF_SIZE];
+static size_t buf_filled=0;
+
+/*
+ * httpInitSockets sets up the TCP socket to listen for HTTP connections.
+ */
+
+void
+httpInitSockets(rfbScreenInfoPtr rfbScreen)
+{
+ if (rfbScreen->httpInitDone)
+ return;
+
+ rfbScreen->httpInitDone = TRUE;
+
+ if (!rfbScreen->httpDir)
+ return;
+
+ if (rfbScreen->httpPort == 0) {
+ rfbScreen->httpPort = rfbScreen->rfbPort-100;
+ }
+
+ rfbLog("Listening for HTTP connections on TCP port %d\n", rfbScreen->httpPort);
+
+ rfbLog(" URL http://%s:%d\n",rfbScreen->rfbThisHost,rfbScreen->httpPort);
+
+ if ((rfbScreen->httpListenSock = ListenOnTCPPort(rfbScreen->httpPort)) < 0) {
+ rfbLogPerror("ListenOnTCPPort");
+ return;
+ }
+
+ /*AddEnabledDevice(httpListenSock);*/
+}
+
+
+/*
+ * httpCheckFds is called from ProcessInputEvents to check for input on the
+ * HTTP socket(s). If there is input to process, httpProcessInput is called.
+ */
+
+void
+httpCheckFds(rfbScreenInfoPtr rfbScreen)
+{
+ int nfds;
+ fd_set fds;
+ struct timeval tv;
+ struct sockaddr_in addr;
+ size_t addrlen = sizeof(addr);
+
+ if (!rfbScreen->httpDir)
+ return;
+
+ FD_ZERO(&fds);
+ FD_SET(rfbScreen->httpListenSock, &fds);
+ if (rfbScreen->httpSock >= 0) {
+ FD_SET(rfbScreen->httpSock, &fds);
+ }
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ nfds = select(max(rfbScreen->httpSock,rfbScreen->httpListenSock) + 1, &fds, NULL, NULL, &tv);
+ if (nfds == 0) {
+ return;
+ }
+ if (nfds < 0) {
+#ifdef WIN32
+ errno = WSAGetLastError();
+#endif
+ if (errno != EINTR)
+ rfbLogPerror("httpCheckFds: select");
+ return;
+ }
+
+ if ((rfbScreen->httpSock >= 0) && FD_ISSET(rfbScreen->httpSock, &fds)) {
+ httpProcessInput(rfbScreen);
+ }
+
+ if (FD_ISSET(rfbScreen->httpListenSock, &fds)) {
+ int flags;
+ if (rfbScreen->httpSock >= 0) close(rfbScreen->httpSock);
+
+ if ((rfbScreen->httpSock = accept(rfbScreen->httpListenSock,
+ (struct sockaddr *)&addr, &addrlen)) < 0) {
+ rfbLogPerror("httpCheckFds: accept");
+ return;
+ }
+#ifdef USE_LIBWRAP
+ if(!hosts_ctl("vnc",STRING_UNKNOWN,inet_ntoa(addr.sin_addr),
+ STRING_UNKNOWN)) {
+ rfbLog("Rejected HTTP connection from client %s\n",
+ inet_ntoa(addr.sin_addr));
+#else
+ flags = fcntl(rfbScreen->httpSock, F_GETFL);
+
+ if (flags < 0 || fcntl(rfbScreen->httpSock, F_SETFL, flags | O_NONBLOCK) == -1) {
+ rfbLogPerror("httpCheckFds: fcntl");
+#endif
+ close(rfbScreen->httpSock);
+ rfbScreen->httpSock = -1;
+ return;
+ }
+ flags=fcntl(rfbScreen->httpSock,F_GETFL);
+ if(flags==-1 ||
+ fcntl(rfbScreen->httpSock,F_SETFL,flags|O_NONBLOCK)==-1) {
+ rfbLogPerror("httpCheckFds: fcntl");
+ close(rfbScreen->httpSock);
+ rfbScreen->httpSock=-1;
+ return;
+ }
+
+ /*AddEnabledDevice(httpSock);*/
+ }
+}
+
+
+static void
+httpCloseSock(rfbScreenInfoPtr rfbScreen)
+{
+ close(rfbScreen->httpSock);
+ rfbScreen->httpSock = -1;
+ buf_filled = 0;
+}
+
+static rfbClientRec cl;
+
+/*
+ * httpProcessInput is called when input is received on the HTTP socket.
+ */
+
+static void
+httpProcessInput(rfbScreenInfoPtr rfbScreen)
+{
+ struct sockaddr_in addr;
+ size_t addrlen = sizeof(addr);
+ char fullFname[512];
+ char params[1024];
+ char *ptr;
+ char *fname;
+ unsigned int maxFnameLen;
+ FILE* fd;
+ rfbBool performSubstitutions = FALSE;
+ char str[256+32];
+#ifndef WIN32
+ char* user=getenv("USER");
+#endif
+
+ cl.sock=rfbScreen->httpSock;
+
+ if (strlen(rfbScreen->httpDir) > 255) {
+ rfbErr("-httpd directory too long\n");
+ httpCloseSock(rfbScreen);
+ return;
+ }
+ strcpy(fullFname, rfbScreen->httpDir);
+ fname = &fullFname[strlen(fullFname)];
+ maxFnameLen = 511 - strlen(fullFname);
+
+ buf_filled=0;
+
+ /* Read data from the HTTP client until we get a complete request. */
+ while (1) {
+ ssize_t got;
+
+ if (buf_filled > sizeof (buf)) {
+ rfbErr("httpProcessInput: HTTP request is too long\n");
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ got = read (rfbScreen->httpSock, buf + buf_filled,
+ sizeof (buf) - buf_filled - 1);
+
+ if (got <= 0) {
+ if (got == 0) {
+ rfbErr("httpd: premature connection close\n");
+ } else {
+ if (errno == EAGAIN) {
+ return;
+ }
+ rfbLogPerror("httpProcessInput: read");
+ }
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ buf_filled += got;
+ buf[buf_filled] = '\0';
+
+ /* Is it complete yet (is there a blank line)? */
+ if (strstr (buf, "\r\r") || strstr (buf, "\n\n") ||
+ strstr (buf, "\r\n\r\n") || strstr (buf, "\n\r\n\r"))
+ break;
+ }
+
+
+ /* Process the request. */
+ if(rfbScreen->httpEnableProxyConnect) {
+ const static char* PROXY_OK_STR = "HTTP/1.0 200 OK\r\nContent-Type: octet-stream\r\nPragma: no-cache\r\n\r\n";
+ if(!strncmp(buf, "CONNECT ", 8)) {
+ if(atoi(strchr(buf, ':')+1)!=rfbScreen->rfbPort) {
+ rfbErr("httpd: CONNECT format invalid.\n");
+ WriteExact(&cl,INVALID_REQUEST_STR, strlen(INVALID_REQUEST_STR));
+ httpCloseSock(rfbScreen);
+ return;
+ }
+ /* proxy connection */
+ rfbLog("httpd: client asked for CONNECT\n");
+ WriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR));
+ rfbNewClientConnection(rfbScreen,rfbScreen->httpSock);
+ rfbScreen->httpSock = -1;
+ return;
+ }
+ if (!strncmp(buf, "GET ",4) && !strncmp(strchr(buf,'/'),"/proxied.connection HTTP/1.", 27)) {
+ /* proxy connection */
+ rfbLog("httpd: client asked for /proxied.connection\n");
+ WriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR));
+ rfbNewClientConnection(rfbScreen,rfbScreen->httpSock);
+ rfbScreen->httpSock = -1;
+ return;
+ }
+ }
+
+ if (strncmp(buf, "GET ", 4)) {
+ rfbErr("httpd: no GET line\n");
+ httpCloseSock(rfbScreen);
+ return;
+ } else {
+ /* Only use the first line. */
+ buf[strcspn(buf, "\n\r")] = '\0';
+ }
+
+ if (strlen(buf) > maxFnameLen) {
+ rfbErr("httpd: GET line too long\n");
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ if (sscanf(buf, "GET %s HTTP/1.0", fname) != 1) {
+ rfbErr("httpd: couldn't parse GET line\n");
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ if (fname[0] != '/') {
+ rfbErr("httpd: filename didn't begin with '/'\n");
+ WriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ if (strchr(fname+1, '/') != NULL) {
+ rfbErr("httpd: asking for file in other directory\n");
+ WriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ getpeername(rfbScreen->httpSock, (struct sockaddr *)&addr, &addrlen);
+ rfbLog("httpd: get '%s' for %s\n", fname+1,
+ inet_ntoa(addr.sin_addr));
+
+ /* Extract parameters from the URL string if necessary */
+
+ params[0] = '\0';
+ ptr = strchr(fname, '?');
+ if (ptr != NULL) {
+ *ptr = '\0';
+ if (!parseParams(&ptr[1], params, 1024)) {
+ params[0] = '\0';
+ rfbErr("httpd: bad parameters in the URL\n");
+ }
+ }
+
+
+ /* If we were asked for '/', actually read the file index.vnc */
+
+ if (strcmp(fname, "/") == 0) {
+ strcpy(fname, "/index.vnc");
+ rfbLog("httpd: defaulting to '%s'\n", fname+1);
+ }
+
+ /* Substitutions are performed on files ending .vnc */
+
+ if (strlen(fname) >= 4 && strcmp(&fname[strlen(fname)-4], ".vnc") == 0) {
+ performSubstitutions = TRUE;
+ }
+
+ /* Open the file */
+
+ if ((fd = fopen(fullFname, "r")) == 0) {
+ rfbLogPerror("httpProcessInput: open");
+ WriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ WriteExact(&cl, OK_STR, strlen(OK_STR));
+
+ while (1) {
+ int n = fread(buf, 1, BUF_SIZE-1, fd);
+ if (n < 0) {
+ rfbLogPerror("httpProcessInput: read");
+ fclose(fd);
+ httpCloseSock(rfbScreen);
+ return;
+ }
+
+ if (n == 0)
+ break;
+
+ if (performSubstitutions) {
+
+ /* Substitute $WIDTH, $HEIGHT, etc with the appropriate values.
+ This won't quite work properly if the .vnc file is longer than
+ BUF_SIZE, but it's reasonable to assume that .vnc files will
+ always be short. */
+
+ char *ptr = buf;
+ char *dollar;
+ buf[n] = 0; /* make sure it's null-terminated */
+
+ while ((dollar = strchr(ptr, '$'))!=NULL) {
+ WriteExact(&cl, ptr, (dollar - ptr));
+
+ ptr = dollar;
+
+ if (compareAndSkip(&ptr, "$WIDTH")) {
+
+ sprintf(str, "%d", rfbScreen->width);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$HEIGHT")) {
+
+ sprintf(str, "%d", rfbScreen->height);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$APPLETWIDTH")) {
+
+ sprintf(str, "%d", rfbScreen->width);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$APPLETHEIGHT")) {
+
+ sprintf(str, "%d", rfbScreen->height + 32);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$PORT")) {
+
+ sprintf(str, "%d", rfbScreen->rfbPort);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$DESKTOP")) {
+
+ WriteExact(&cl, rfbScreen->desktopName, strlen(rfbScreen->desktopName));
+
+ } else if (compareAndSkip(&ptr, "$DISPLAY")) {
+
+ sprintf(str, "%s:%d", rfbScreen->rfbThisHost, rfbScreen->rfbPort-5900);
+ WriteExact(&cl, str, strlen(str));
+
+ } else if (compareAndSkip(&ptr, "$USER")) {
+#ifndef WIN32
+ if (user) {
+ WriteExact(&cl, user,
+ strlen(user));
+ } else
+#endif
+ WriteExact(&cl, "?", 1);
+ } else if (compareAndSkip(&ptr, "$PARAMS")) {
+ if (params[0] != '\0')
+ WriteExact(&cl, params, strlen(params));
+ } else {
+ if (!compareAndSkip(&ptr, "$$"))
+ ptr++;
+
+ if (WriteExact(&cl, "$", 1) < 0) {
+ fclose(fd);
+ httpCloseSock(rfbScreen);
+ return;
+ }
+ }
+ }
+ if (WriteExact(&cl, ptr, (&buf[n] - ptr)) < 0)
+ break;
+
+ } else {
+
+ /* For files not ending .vnc, just write out the buffer */
+
+ if (WriteExact(&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(&param_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, and dots. Replace all '+' signs with spaces.
+ */
+
+static rfbBool
+validateString(char *str)
+{
+ char *ptr;
+
+ for (ptr = str; *ptr != '\0'; ptr++) {
+ if (!isalnum(*ptr) && *ptr != '_' && *ptr != '.') {
+ if (*ptr == '+') {
+ *ptr = ' ';
+ } else {
+ return FALSE;
+ }
+ }
+ }
+ return TRUE;
+}
+
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