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libtdevnc
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libtdevnc/httpd.c

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/*
* httpd.c - a simple HTTP server
*/
/*
* 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 <stdio.h>
#include <sys/types.h>
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#ifdef WIN32
#include <winsock.h>
#define close closesocket
#else
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#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <pwd.h>
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#include <arpa/inet.h>
#include <unistd.h>
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#endif
#include <fcntl.h>
#include <errno.h>
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#include "rfb.h"
#define NOT_FOUND_STR "HTTP/1.0 404 Not found\n\n" \
"<HEAD><TITLE>File Not Found</TITLE></HEAD>\n" \
"<BODY><H1>File Not Found</H1></BODY>\n"
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#define OK_STR "HTTP/1.0 200 OK\nContent-Type: text/html\n\n"
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static void httpProcessInput();
static Bool compareAndSkip(char **ptr, const char *str);
/*
int httpPort = 0;
char *httpDir = NULL;
int httpListenSock = -1;
int httpSock = -1;
FILE* httpFP = NULL;
*/
#define BUF_SIZE 32768
static char buf[BUF_SIZE];
/*
* httpInitSockets sets up the TCP socket to listen for HTTP connections.
*/
void
httpInitSockets(rfbScreenInfoPtr rfbScreen)
{
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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)
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");
exit(1);
}
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/*AddEnabledDevice(httpListenSock);*/
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}
/*
* 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)
{
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int nfds;
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fd_set fds;
struct timeval tv;
struct sockaddr_in addr;
int 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) {
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#ifdef WIN32
errno = WSAGetLastError();
#endif
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rfbLogPerror("httpCheckFds: select");
return;
}
if ((rfbScreen->httpSock >= 0) && FD_ISSET(rfbScreen->httpSock, &fds)) {
httpProcessInput(rfbScreen);
}
if (FD_ISSET(rfbScreen->httpListenSock, &fds)) {
if (rfbScreen->httpSock >= 0) close(rfbScreen->httpSock);
if ((rfbScreen->httpSock = accept(rfbScreen->httpListenSock,
(struct sockaddr *)&addr, &addrlen)) < 0) {
rfbLogPerror("httpCheckFds: accept");
return;
}
if ((rfbScreen->httpFP = fdopen(rfbScreen->httpSock, "r+")) == NULL) {
rfbLogPerror("httpCheckFds: fdopen");
close(rfbScreen->httpSock);
rfbScreen->httpSock = -1;
return;
}
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/*AddEnabledDevice(httpSock);*/
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}
}
static void
httpCloseSock(rfbScreenInfoPtr rfbScreen)
{
fclose(rfbScreen->httpFP);
rfbScreen->httpFP = NULL;
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/*RemoveEnabledDevice(httpSock);*/
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rfbScreen->httpSock = -1;
}
static rfbClientRec cl;
/*
* httpProcessInput is called when input is received on the HTTP socket.
*/
static void
httpProcessInput(rfbScreenInfoPtr rfbScreen)
{
struct sockaddr_in addr;
int addrlen = sizeof(addr);
char fullFname[256];
char *fname;
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unsigned int maxFnameLen;
FILE* fd;
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Bool gotGet = FALSE;
Bool performSubstitutions = FALSE;
char str[256];
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#ifndef WIN32
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struct passwd *user = getpwuid(getuid());;
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#endif
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cl.sock=rfbScreen->httpSock;
if (strlen(rfbScreen->httpDir) > 200) {
rfbLog("-httpd directory too long\n");
httpCloseSock(rfbScreen);
return;
}
strcpy(fullFname, rfbScreen->httpDir);
fname = &fullFname[strlen(fullFname)];
maxFnameLen = 255 - strlen(fullFname);
buf[0] = '\0';
while (1) {
/* Read lines from the HTTP client until a blank line. The only
line we need to parse is the line "GET <filename> ..." */
if (!fgets(buf, BUF_SIZE, rfbScreen->httpFP)) {
rfbLogPerror("httpProcessInput: fgets");
httpCloseSock(rfbScreen);
return;
}
if ((strcmp(buf,"\n") == 0) || (strcmp(buf,"\r\n") == 0)
|| (strcmp(buf,"\r") == 0) || (strcmp(buf,"\n\r") == 0))
/* end of client request */
break;
if (strncmp(buf, "GET ", 4) == 0) {
gotGet = TRUE;
if (strlen(buf) > maxFnameLen) {
rfbLog("GET line too long\n");
httpCloseSock(rfbScreen);
return;
}
if (sscanf(buf, "GET %s HTTP/1.0", fname) != 1) {
rfbLog("couldn't parse GET line\n");
httpCloseSock(rfbScreen);
return;
}
if (fname[0] != '/') {
rfbLog("filename didn't begin with '/'\n");
WriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
httpCloseSock(rfbScreen);
return;
}
if (strchr(fname+1, '/') != NULL) {
rfbLog("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));
continue;
}
}
if (!gotGet) {
rfbLog("no GET line\n");
httpCloseSock(rfbScreen);
return;
}
/* 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 */
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if ((fd = fopen(fullFname, "r")) <= 0) {
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rfbLogPerror("httpProcessInput: open");
WriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR));
httpCloseSock(rfbScreen);
return;
}
WriteExact(&cl, OK_STR, strlen(OK_STR));
while (1) {
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int n = fread(buf, 1, BUF_SIZE-1, fd);
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if (n < 0) {
rfbLogPerror("httpProcessInput: read");
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fclose(fd);
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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")) {
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#ifndef WIN32
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if (user) {
WriteExact(&cl, user->pw_name,
strlen(user->pw_name));
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} else
#endif
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WriteExact(&cl, "?", 1);
} else {
if (!compareAndSkip(&ptr, "$$"))
ptr++;
if (WriteExact(&cl, "$", 1) < 0) {
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fclose(fd);
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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;
}
}
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fclose(fd);
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httpCloseSock(rfbScreen);
}
static Bool
compareAndSkip(char **ptr, const char *str)
{
if (strncmp(*ptr, str, strlen(str)) == 0) {
*ptr += strlen(str);
return TRUE;
}
return FALSE;
}