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| /*
** A small, simple HTTP server.
**
** Features:
**
** * Launched from inetd
** * One process per request
** * Deliver static content or run CGI
** * Virtual sites based on the "Host:" property of the HTTP header
** * Very small code base (1 file) to facility security auditing
** * Simple setup - no configuration files to mess with.
**
** This file implements a small and simple but secure and effective web
** server. There are no frills. Anything that could be reasonably
** omitted has been.
**
** Setup rules:
**
** (1) Launch as root from inetd like this:
**
** httpd -logfile logfile -root /home/www -user nobody
**
** It will automatically chroot to /home/www and become user nobody.
** The logfile name should be relative to the chroot jail.
**
** (2) Directories of the form "*.website" (ex: www_hwaci_com.website)
** contain content. The directory is chosen based on HOST. If no
** HOST or the host directory is not found, "default.website" is used.
**
** (3) Any file or directory whose name begins with "." or "-" is ignored.
**
** (4) Characters other than a-zA-Z0-9_.,*~/ in the filename are translated
** into _. This is a defense against cross-site scripting attacks and
** other mischief.
**
** (5) Executable files are run as CGI. All other files are delivered
** as is.
**
** (6) For SSL support use stunnel and add the -https 1 option on the
** httpd command-line.
*/
#include <stdio.h>
#include <ctype.h>
#include <syslog.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <pwd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdarg.h>
#include <time.h>
#include <sys/times.h>
#ifdef linux
#include <sys/sendfile.h>
#endif
/*
** Configure the server by setting the following macros and recompiling.
*/
#ifndef DEFAULT_PORT
#define DEFAULT_PORT "80"
#endif
#ifndef MAX_CONTENT_LENGTH
#define MAX_CONTENT_LENGTH 9000000
#endif
/*
** The error number from system calls.
*/
extern int errno;
/*
** We record most of the state information as global variables. This
** saves having to pass information to subroutines as parameters, and
** makes the executable smaller...
*/
static char *zRoot = 0; /* Root directory of the website */
static char *zTmpNam = 0; /* Name of a temporary file */
static char zTmpNamBuf[500]; /* Space to hold the temporary filename */
static char *zProtocol = 0; /* The protocol being using by the browser */
static char *zMethod = 0; /* The method. Must be GET */
static char *zScript = 0; /* The object to retrieve */
static char *zRealScript = 0; /* The object to retrieve. Same as zScript
** except might have "/index.html" appended */
static char *zHome = 0; /* The directory containing content */
static char *zQueryString = 0; /* The query string on the end of the name */
static char *zFile = 0; /* The filename of the object to retrieve */
static int lenFile = 0; /* Length of the zFile name */
static char *zDir = 0; /* Name of the directory holding zFile */
static char *zPathInfo = 0; /* Part of the pathname past the file */
static char *zAgent = 0; /* What type if browser is making this query */
static char *zServerName = 0; /* The name after the http:// */
static char *zServerPort = 0; /* The port number */
static char *zCookie = 0; /* Cookies reported with the request */
static char *zHttpHost = 0; /* Name according to the web browser */
static char *zRealPort = 0; /* The real TCP port when running as daemon */
static char *zRemoteAddr = 0; /* IP address of the request */
static char *zReferer = 0; /* Name of the page that refered to us */
static char *zAccept = 0; /* What formats will be accepted */
static char *zContentLength = 0; /* Content length reported in the header */
static char *zContentType = 0; /* Content type reported in the header */
static char *zQuerySuffix = 0; /* The part of the URL after the first ? */
static int nIn = 0; /* Number of bytes of input */
static int nOut = 0; /* Number of bytes of output */
static char zReplyStatus[4]; /* Reply status code */
static int statusSent = 0; /* True after status line is sent */
static char *zLogFile = 0; /* Log to this file */
static int debugFlag = 0; /* True if being debugged */
static time_t beginTime; /* Time when this process starts */
static int closeConnection = 0; /* True to send Connection: close in reply */
static int nRequest = 0; /* Number of requests processed */
static int omitLog = 0; /* Do not make logfile entries if true */
static int useHttps = 0; /* True to use HTTPS: instead of HTTP: */
static char *zHttp = "http"; /* http or https */
/*
** Change every space or unprintable character in the zAgent[] string
** into an _.
**
** If the user agent string contains certain prohibited string, then
** exit immediately.
*/
static void FixupUserAgent(void){
int i;
if( zAgent==0 || zAgent[0]==0 ) zAgent = "*";
for(i=0; zAgent[i]; i++){
int c = zAgent[i];
if( c<'!' || c>'~' ){ zAgent[i] = '_'; }
}
#if 0
if( strncmp(zAgent,"msnbot",6)==0 ){
exit(0);
}
#endif
for(i=0; zAgent[i]; i++){
if( zAgent[i]=='W' && strncmp(&zAgent[i],"Windows_9",9)==0 ){
exit(0);
}
}
}
/*
** Make an entry in the log file. If the HTTP connection should be
** closed, then terminate this process. Otherwise return.
*/
static void MakeLogEntry(int a){
FILE *log;
if( zTmpNam ){
unlink(zTmpNam);
}
if( zLogFile && !omitLog ){
time_t now;
struct tm *pTm;
struct tms sTms;
double rScale;
int i;
char zDate[200];
if( zScript==0 || zScript[0]==0 ) zScript = "*";
if( zRemoteAddr==0 || zRemoteAddr[0]==0 ) zRemoteAddr = "*";
if( zHttpHost==0 || zHttpHost[0]==0 ) zHttpHost = "*";
if( zReferer==0 || zReferer[0]==0 ) zReferer = "*";
for(i=0; zReferer[i]; i++){
if( isspace(zReferer[i]) ){ zReferer = "*"; break; }
}
if( zAgent==0 || zAgent[0]==0 ) zAgent = "*";
time(&now);
pTm = localtime(&now);
strftime(zDate, sizeof(zDate), "%Y-%m-%d %H:%M:%S", pTm);
times(&sTms);
rScale = 1.0/(double)sysconf(_SC_CLK_TCK);
chdir(zRoot[0] ? zRoot : "/");
if( (log = fopen(zLogFile,"a"))!=0 ){
fprintf(log, "%s %s %s://%s%s %s %s %d %d %g %g %g %g %d %d %s\n",
zDate, zRemoteAddr, zHttp, zHttpHost, zScript, zReferer,
zReplyStatus, nIn, nOut,
rScale*sTms.tms_utime,
rScale*sTms.tms_stime,
rScale*sTms.tms_cutime,
rScale*sTms.tms_cstime,
(int)(now - beginTime),
nRequest, zAgent
);
fclose(log);
nIn = nOut = 0;
}
}
if( closeConnection ){
exit(a);
}
statusSent = 0;
}
/*
** Allocate memory safely
*/
static char *SafeMalloc( int size ){
char *p;
p = (char*)malloc(size);
if( p==0 ){
strcpy(zReplyStatus, "998");
MakeLogEntry(1);
exit(1);
}
return p;
}
/*
** Set the value of environment variable zVar to zValue.
*/
static void SetEnv(const char *zVar, const char *zValue){
char *z;
int len;
if( zValue==0 ) zValue="";
len = strlen(zVar) + strlen(zValue) + 2;
z = SafeMalloc(len);
sprintf(z,"%s=%s",zVar,zValue);
putenv(z);
}
/*
** Remove the first space-delimited token from a string and return
** a pointer to it. Add a NULL to the string to terminate the token.
** Make *zLeftOver point to the start of the next token.
*/
static char *GetFirstElement(char *zInput, char **zLeftOver){
char *zResult = 0;
if( zInput==0 ){
if( zLeftOver ) *zLeftOver = 0;
return 0;
}
while( isspace(*zInput) ){ zInput++; }
zResult = zInput;
while( *zInput && !isspace(*zInput) ){ zInput++; }
if( *zInput ){
*zInput = 0;
zInput++;
while( isspace(*zInput) ){ zInput++; }
}
if( zLeftOver ){ *zLeftOver = zInput; }
return zResult;
}
/*
** Make a copy of a string into memory obtained from malloc.
*/
static char *StrDup(const char *zSrc){
char *zDest;
int size;
if( zSrc==0 ) return 0;
size = strlen(zSrc) + 1;
zDest = (char*)SafeMalloc( size );
strcpy(zDest,zSrc);
return zDest;
}
static char *StrAppend(char *zPrior, const char *zSep, const char *zSrc){
char *zDest;
int size;
int n1, n2;
if( zSrc==0 ) return 0;
if( zPrior==0 ) return StrDup(zSrc);
size = (n1=strlen(zSrc)) + (n2=strlen(zSep)) + strlen(zPrior) + 1;
zDest = (char*)SafeMalloc( size );
strcpy(zDest,zPrior);
free(zPrior);
strcpy(&zDest[n1],zSep);
strcpy(&zDest[n1+n2],zSrc);
return zDest;
}
/*
** Break a line at the first \n or \r character seen.
*/
static void RemoveNewline(char *z){
if( z==0 ) return;
while( *z && *z!='\n' && *z!='\r' ){ z++; }
*z = 0;
}
/*
** Print a date tag in the header. The name of the tag is zTag.
** The date is determined from the unix timestamp given.
*/
static int DateTag(const char *zTag, time_t t){
struct tm *tm;
char zDate[100];
tm = gmtime(&t);
strftime(zDate, sizeof(zDate), "%a, %d %b %Y %H:%M:%S %z", tm);
return printf("%s: %s\r\n", zTag, zDate);
}
/*
** Print the first line of a response followed by the server type.
*/
static void StartResponse(const char *zResultCode){
time_t now;
time(&now);
if( statusSent ) return;
nOut += printf("%s %s\r\n", zProtocol, zResultCode);
strncpy(zReplyStatus, zResultCode, 3);
zReplyStatus[3] = 0;
if( zReplyStatus[0]>='4' ){
closeConnection = 1;
}
if( closeConnection ){
nOut += printf("Connection: close\r\n");
}else{
nOut += printf("Connection: keep-alive\r\n");
}
nOut += DateTag("Date", now);
statusSent = 1;
}
/*
** Tell the client that there is no such document
*/
static void NotFound(int lineno){
StartResponse("404 Not Found");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<head><title lineno=\"%d\">Not Found</title></head>\n"
"<body><h1>Document Not Found</h1>\n"
"The document %s is not avaivable on this server\n"
"</body>\n", lineno, zScript);
MakeLogEntry(0);
exit(0);
}
/*
** Tell the client that there is an error in the script.
*/
static void CgiError(void){
StartResponse("500 Error");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<head><title>CGI Program Error</title></head>\n"
"<body><h1>CGI Program Error</h1>\n"
"The CGI program %s generated an error\n"
"</body>\n", zScript);
MakeLogEntry(0);
exit(0);
}
/*
** This is called if we timeout.
*/
static void Timeout(int NotUsed){
if( !debugFlag ){
strcpy(zReplyStatus, "999");
MakeLogEntry(0);
exit(0);
}
}
/*
** Tell the client that there is an error in the script.
*/
static void CgiScriptWritable(void){
StartResponse("500 CGI Configuration Error");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<head><title>CGI Configuration Error</title></head>\n"
"<body><h1>CGI Configuration Error</h1>\n"
"The CGI program %s is writable by users other than its owner.\n"
"</body>\n", zRealScript);
MakeLogEntry(0);
exit(0);
}
/*
** Tell the client that the server malfunctioned.
*/
static void Malfunction(int linenum, const char *zFormat, ...){
va_list ap;
va_start(ap, zFormat);
StartResponse("500 Server Malfunction");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<head><title>Server Malfunction</title></head>\n"
"<body><h1>Server Malfunction</h1>\n"
"<p>This web server has malfunctioned.\n\n"
"(Error number: %d)</p>\n", linenum);
if( zFormat ){
nOut += printf("<p>");
nOut += vprintf(zFormat, ap);
nOut += printf("</p>\n\n");
}
nOut += printf("</body>\n");
MakeLogEntry(0);
exit(0);
}
/*
** Do a server redirect to the document specified. The document
** name not contain scheme or network location or the query string.
** It will be just the path.
*/
static void Redirect(const char *zPath, int finish){
StartResponse("302 Temporary Redirect");
if( zServerPort==0 || zServerPort[0]==0 || strcmp(zServerPort,"80")==0 ){
nOut += printf("Location: %s://%s%s%s\r\n",
zHttp, zServerName, zPath, zQuerySuffix);
}else{
nOut += printf("Location: %s://%s:%s%s%s\r\n",
zHttp, zServerName, zServerPort, zPath, zQuerySuffix);
}
if( finish ){
nOut += printf("\r\n");
MakeLogEntry(0);
}
}
/*
** Guess the mime-type of a document based on its name.
*/
const char *GetMimeType(const char *zName, int nName){
const char *z;
int i;
int first, last;
int len;
char zSuffix[20];
/* A table of mimetypes based on file suffixes.
** Suffixes must be in sorted order so that we can do a binary
** search to find the mime-type
*/
static const struct {
const char *zSuffix; /* The file suffix */
int size; /* Length of the suffix */
const char *zMimetype; /* The corresponding mimetype */
} aMime[] = {
{ "ai", 2, "application/postscript" },
{ "aif", 3, "audio/x-aiff" },
{ "aifc", 4, "audio/x-aiff" },
{ "aiff", 4, "audio/x-aiff" },
{ "arj", 3, "application/x-arj-compressed" },
{ "asc", 3, "text/plain" },
{ "asf", 3, "video/x-ms-asf" },
{ "asx", 3, "video/x-ms-asx" },
{ "au", 2, "audio/ulaw" },
{ "avi", 3, "video/x-msvideo" },
{ "bat", 3, "application/x-msdos-program" },
{ "bcpio", 5, "application/x-bcpio" },
{ "bin", 3, "application/octet-stream" },
{ "c", 1, "text/plain" },
{ "cc", 2, "text/plain" },
{ "ccad", 4, "application/clariscad" },
{ "cdf", 3, "application/x-netcdf" },
{ "class", 5, "application/octet-stream" },
{ "cod", 3, "application/vnd.rim.cod" },
{ "com", 3, "application/x-msdos-program" },
{ "cpio", 4, "application/x-cpio" },
{ "cpt", 3, "application/mac-compactpro" },
{ "csh", 3, "application/x-csh" },
{ "css", 3, "text/css" },
{ "dcr", 3, "application/x-director" },
{ "deb", 3, "application/x-debian-package" },
{ "dir", 3, "application/x-director" },
{ "dl", 2, "video/dl" },
{ "dms", 3, "application/octet-stream" },
{ "doc", 3, "application/msword" },
{ "drw", 3, "application/drafting" },
{ "dvi", 3, "application/x-dvi" },
{ "dwg", 3, "application/acad" },
{ "dxf", 3, "application/dxf" },
{ "dxr", 3, "application/x-director" },
{ "eps", 3, "application/postscript" },
{ "etx", 3, "text/x-setext" },
{ "exe", 3, "application/octet-stream" },
{ "ez", 2, "application/andrew-inset" },
{ "f", 1, "text/plain" },
{ "f90", 3, "text/plain" },
{ "fli", 3, "video/fli" },
{ "flv", 3, "video/flv" },
{ "gif", 3, "image/gif" },
{ "gl", 2, "video/gl" },
{ "gtar", 4, "application/x-gtar" },
{ "gz", 2, "application/x-gzip" },
{ "hdf", 3, "application/x-hdf" },
{ "hh", 2, "text/plain" },
{ "hqx", 3, "application/mac-binhex40" },
{ "h", 1, "text/plain" },
{ "htm", 3, "text/html" },
{ "html", 4, "text/html" },
{ "ice", 3, "x-conference/x-cooltalk" },
{ "ief", 3, "image/ief" },
{ "iges", 4, "model/iges" },
{ "igs", 3, "model/iges" },
{ "ips", 3, "application/x-ipscript" },
{ "ipx", 3, "application/x-ipix" },
{ "jad", 3, "text/vnd.sun.j2me.app-descriptor" },
{ "jar", 3, "application/java-archive" },
{ "jpeg", 4, "image/jpeg" },
{ "jpe", 3, "image/jpeg" },
{ "jpg", 3, "image/jpeg" },
{ "js", 2, "application/x-javascript" },
{ "kar", 3, "audio/midi" },
{ "latex", 5, "application/x-latex" },
{ "lha", 3, "application/octet-stream" },
{ "lsp", 3, "application/x-lisp" },
{ "lzh", 3, "application/octet-stream" },
{ "m", 1, "text/plain" },
{ "m3u", 3, "audio/x-mpegurl" },
{ "man", 3, "application/x-troff-man" },
{ "me", 2, "application/x-troff-me" },
{ "mesh", 4, "model/mesh" },
{ "mid", 3, "audio/midi" },
{ "midi", 4, "audio/midi" },
{ "mif", 3, "application/x-mif" },
{ "mime", 4, "www/mime" },
{ "movie", 5, "video/x-sgi-movie" },
{ "mov", 3, "video/quicktime" },
{ "mp2", 3, "audio/mpeg" },
{ "mp2", 3, "video/mpeg" },
{ "mp3", 3, "audio/mpeg" },
{ "mpeg", 4, "video/mpeg" },
{ "mpe", 3, "video/mpeg" },
{ "mpga", 4, "audio/mpeg" },
{ "mpg", 3, "video/mpeg" },
{ "ms", 2, "application/x-troff-ms" },
{ "msh", 3, "model/mesh" },
{ "nc", 2, "application/x-netcdf" },
{ "oda", 3, "application/oda" },
{ "ogg", 3, "application/ogg" },
{ "ogm", 3, "application/ogg" },
{ "pbm", 3, "image/x-portable-bitmap" },
{ "pdb", 3, "chemical/x-pdb" },
{ "pdf", 3, "application/pdf" },
{ "pgm", 3, "image/x-portable-graymap" },
{ "pgn", 3, "application/x-chess-pgn" },
{ "pgp", 3, "application/pgp" },
{ "pl", 2, "application/x-perl" },
{ "pm", 2, "application/x-perl" },
{ "png", 3, "image/png" },
{ "pnm", 3, "image/x-portable-anymap" },
{ "pot", 3, "application/mspowerpoint" },
{ "ppm", 3, "image/x-portable-pixmap" },
{ "pps", 3, "application/mspowerpoint" },
{ "ppt", 3, "application/mspowerpoint" },
{ "ppz", 3, "application/mspowerpoint" },
{ "pre", 3, "application/x-freelance" },
{ "prt", 3, "application/pro_eng" },
{ "ps", 2, "application/postscript" },
{ "qt", 2, "video/quicktime" },
{ "ra", 2, "audio/x-realaudio" },
{ "ram", 3, "audio/x-pn-realaudio" },
{ "rar", 3, "application/x-rar-compressed" },
{ "ras", 3, "image/cmu-raster" },
{ "ras", 3, "image/x-cmu-raster" },
{ "rgb", 3, "image/x-rgb" },
{ "rm", 2, "audio/x-pn-realaudio" },
{ "roff", 4, "application/x-troff" },
{ "rpm", 3, "audio/x-pn-realaudio-plugin" },
{ "rtf", 3, "application/rtf" },
{ "rtf", 3, "text/rtf" },
{ "rtx", 3, "text/richtext" },
{ "scm", 3, "application/x-lotusscreencam" },
{ "set", 3, "application/set" },
{ "sgml", 4, "text/sgml" },
{ "sgm", 3, "text/sgml" },
{ "sh", 2, "application/x-sh" },
{ "shar", 4, "application/x-shar" },
{ "silo", 4, "model/mesh" },
{ "sit", 3, "application/x-stuffit" },
{ "skd", 3, "application/x-koan" },
{ "skm", 3, "application/x-koan" },
{ "skp", 3, "application/x-koan" },
{ "skt", 3, "application/x-koan" },
{ "smi", 3, "application/smil" },
{ "smil", 4, "application/smil" },
{ "snd", 3, "audio/basic" },
{ "sol", 3, "application/solids" },
{ "spl", 3, "application/x-futuresplash" },
{ "src", 3, "application/x-wais-source" },
{ "step", 4, "application/STEP" },
{ "stl", 3, "application/SLA" },
{ "stp", 3, "application/STEP" },
{ "sv4cpio", 7, "application/x-sv4cpio" },
{ "sv4crc", 6, "application/x-sv4crc" },
{ "swf", 3, "application/x-shockwave-flash" },
{ "t", 1, "application/x-troff" },
{ "tar", 3, "application/x-tar" },
{ "tcl", 3, "application/x-tcl" },
{ "tex", 3, "application/x-tex" },
{ "texi", 4, "application/x-texinfo" },
{ "texinfo", 7, "application/x-texinfo" },
{ "tgz", 3, "application/x-tar-gz" },
{ "tiff", 4, "image/tiff" },
{ "tif", 3, "image/tiff" },
{ "tr", 2, "application/x-troff" },
{ "tsi", 3, "audio/TSP-audio" },
{ "tsp", 3, "application/dsptype" },
{ "tsv", 3, "text/tab-separated-values" },
{ "txt", 3, "text/plain" },
{ "unv", 3, "application/i-deas" },
{ "ustar", 5, "application/x-ustar" },
{ "vcd", 3, "application/x-cdlink" },
{ "vda", 3, "application/vda" },
{ "viv", 3, "video/vnd.vivo" },
{ "vivo", 4, "video/vnd.vivo" },
{ "vrml", 4, "model/vrml" },
{ "wav", 3, "audio/x-wav" },
{ "wax", 3, "audio/x-ms-wax" },
{ "wiki", 4, "application/x-fossil-wiki" },
{ "wma", 3, "audio/x-ms-wma" },
{ "wmv", 3, "video/x-ms-wmv" },
{ "wmx", 3, "video/x-ms-wmx" },
{ "wrl", 3, "model/vrml" },
{ "wvx", 3, "video/x-ms-wvx" },
{ "xbm", 3, "image/x-xbitmap" },
{ "xlc", 3, "application/vnd.ms-excel" },
{ "xll", 3, "application/vnd.ms-excel" },
{ "xlm", 3, "application/vnd.ms-excel" },
{ "xls", 3, "application/vnd.ms-excel" },
{ "xlw", 3, "application/vnd.ms-excel" },
{ "xml", 3, "text/xml" },
{ "xpm", 3, "image/x-xpixmap" },
{ "xwd", 3, "image/x-xwindowdump" },
{ "xyz", 3, "chemical/x-pdb" },
{ "zip", 3, "application/zip" },
};
for(i=nName-1; i>0 && zName[i]!='.'; i--){}
z = &zName[i+1];
len = nName - i;
if( len<sizeof(zSuffix)-1 ){
strcpy(zSuffix, z);
for(i=0; zSuffix[i]; i++) zSuffix[i] = tolower(zSuffix[i]);
first = 0;
last = sizeof(aMime)/sizeof(aMime[0]);
while( first<=last ){
int c;
i = (first+last)/2;
c = strcmp(zSuffix, aMime[i].zSuffix);
if( c==0 ) return aMime[i].zMimetype;
if( c<0 ){
last = i-1;
}else{
first = i+1;
}
}
}
return "application/octet-stream";
}
/*
** The following table contains 1 for all characters that are permitted in
** the part of the URL before the query parameters and fragment.
*/
static const char allowedInName[] = {
/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
/* 0x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 1x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 2x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
/* 3x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
/* 4x */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
/* 6x */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
};
/*
** This routine processes a single HTTP request on standard input and
** sends the reply to standard output. If the argument is 1 it means
** that we are should close the socket without processing additional
** HTTP requests after the current request finishes. 0 means we are
** allowed to keep the connection open and to process additional requests.
** This routine may choose to close the connection even if the argument
** is 0.
**
** If the connection should be closed, this routine calls exit() and
** thus never returns. If this routine does return it means that another
** HTTP request may appear on the wire.
*/
void ProcessOneRequest(int forceClose){
int i, c;
char *z; /* Used to parse up a string */
struct stat statbuf; /* Information about the file to be retrieved */
FILE *in; /* For reading from CGI scripts */
char zLine[1000]; /* A buffer for input lines or forming names */
/* Change directories to the root of the HTTP filesystem
*/
if( chdir(zRoot[0] ? zRoot : "/")!=0 ){
char zBuf[1000];
Malfunction(__LINE__, "cannot chdir to [%s] from [%s]",
zRoot, getcwd(zBuf,999));
}
nRequest++;
/*
** We must receive a complete header within 15 seconds
*/
signal(SIGALRM, Timeout);
alarm(15);
/* Get the first line of the request and parse out the
** method, the script and the protocol.
*/
if( fgets(zLine,sizeof(zLine),stdin)==0 ){
exit(0);
}
omitLog = 0;
nIn += strlen(zLine);
zMethod = StrDup(GetFirstElement(zLine,&z));
zRealScript = zScript = StrDup(GetFirstElement(z,&z));
zProtocol = StrDup(GetFirstElement(z,&z));
if( zProtocol==0 || strncmp(zProtocol,"HTTP/",5)!=0 || strlen(zProtocol)!=8 ){
StartResponse("400 Bad Request");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<title>Unknown Protocol On HTTP Request</title>\n"
"<h1>Unknown Protocol</h1>\n"
"This server does not understand the requested protocol\n"
);
MakeLogEntry(0);
exit(0);
}
if( forceClose ){
closeConnection = 1;
}else if( zProtocol[5]<'1' || zProtocol[7]<'1' ){
closeConnection = 1;
}
/* This very simple server only understands the GET, POST
** and HEAD methods
*/
if( strcmp(zMethod,"GET")!=0 && strcmp(zMethod,"POST")!=0
&& strcmp(zMethod,"HEAD")!=0 ){
StartResponse("501 Not Implemented");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"<head><title>Method not implemented</title></head>\n"
"<body><h1>Method not implemented</h1>\n"
"The %s method is not implemented on this server.\n"
"</body>\n",
zMethod);
MakeLogEntry(0);
exit(0);
}
/* Get all the optional fields that follow the first line.
*/
zCookie = 0;
while( fgets(zLine,sizeof(zLine),stdin) ){
char *zFieldName;
char *zVal;
nIn += strlen(zLine);
zFieldName = GetFirstElement(zLine,&zVal);
if( zFieldName==0 || *zFieldName==0 ) break;
RemoveNewline(zVal);
if( strcasecmp(zFieldName,"User-Agent:")==0 ){
zAgent = StrDup(zVal);
FixupUserAgent();
}else if( strcasecmp(zFieldName,"Accept:")==0 ){
zAccept = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Content-length:")==0 ){
zContentLength = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Content-type:")==0 ){
zContentType = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Referer:")==0 ){
zReferer = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Cookie:")==0 ){
zCookie = StrAppend(zCookie,"; ",zVal);
}else if( strcasecmp(zFieldName,"Connection:")==0 ){
if( strcasecmp(zVal,"close")==0 ){
closeConnection = 1;
}else if( !forceClose && strcasecmp(zVal, "keep-alive")==0 ){
closeConnection = 0;
}
}else if( strcasecmp(zFieldName,"Host:")==0 ){
zServerPort = zServerName = zHttpHost = StrDup(zVal);
while( zServerPort && *zServerPort && *zServerPort!=':' ){
zServerPort++;
}
if( zServerPort && *zServerPort ){
*zServerPort = 0;
zServerPort++;
}
if( zRealPort ){
zServerPort = StrDup(zRealPort);
}
}
}
/* Make an extra effort to get a valid server name and port number.
** Only Netscape provides this information. If the browser is
** Internet Explorer, then we have to find out the information for
** ourselves.
*/
if( zServerName==0 ){
zServerName = SafeMalloc( 100 );
gethostname(zServerName,100);
}
if( zServerPort==0 || *zServerPort==0 ){
zServerPort = DEFAULT_PORT;
}
/* Remove the query string from the end of the requested file.
*/
for(z=zScript; *z && *z!='?'; z++){}
if( *z=='?' ){
zQuerySuffix = StrDup(z);
*z = 0;
}else{
zQuerySuffix = "";
}
zQueryString = *zQuerySuffix ? &zQuerySuffix[1] : zQuerySuffix;
/* Create a file to hold the POST query data, if any. We have to
** do it this way. We can't just pass the file descriptor down to
** the child process because the fgets() function may have already
** read part of the POST data into its internal buffer.
*/
if( zMethod[0]=='P' && zContentLength!=0 ){
int len = atoi(zContentLength);
FILE *out;
char *zBuf;
int n;
if( len>MAX_CONTENT_LENGTH ){
StartResponse("500 Request too large");
nOut += printf(
"Content-type: text/html\r\n"
"\r\n"
"Too much POST data\n"
"</body>\n"
);
MakeLogEntry(0);
exit(0);
}
sprintf(zTmpNamBuf, "/tmp/-post-data-XXXXXX");
zTmpNam = zTmpNamBuf;
mkstemp(zTmpNam);
out = fopen(zTmpNam,"w");
zBuf = SafeMalloc( len );
alarm(15 + len/2000);
n = fread(zBuf,1,len,stdin);
nIn += n;
fwrite(zBuf,1,n,out);
free(zBuf);
fclose(out);
}
/* Make sure the running time is not too great */
alarm(10);
/* Convert all unusual characters in the script name into "_".
**
** This is a defense against various attacks, XSS attacks in particular.
*/
for(z=zScript; *z; z++){
unsigned char c = *(unsigned char*)z;
if( (c&0x80)!=0 || !allowedInName[c] ){
*z = '_';
if( c=='%' && z[1]!=0 && z[2]!=0 ){
for(i=3; (z[i-2] = z[i])!=0; i++){}
}
}
}
/* Don't allow "/." or "/-" to to occur anywhere in the entity name.
** This prevents attacks involving ".." and also allows us to create
** files and directories whose names begin with "-" which are invisible
** to the webserver.
*/
for(z=zScript; *z; z++){
if( *z=='/' && (z[1]=='.' || z[1]=='-') ){
NotFound(__LINE__);
}
}
/* Figure out what the root of the filesystem should be. If the
** HTTP_HOST parameter exists (stored in zHttpHost) then remove the
** port number from the end (if any), convert all characters to lower
** case, and convert all "." to "_". Then try to find a directory
** with that name and the extension .website. If not found, look
** for "default.website".
*/
if( zScript[0]!='/' ) NotFound(__LINE__);
if( strlen(zRoot)+40 >= sizeof(zLine) ) NotFound(__LINE__);
if( zHttpHost==0 ){
sprintf(zLine, "%s/default.website", zRoot);
}else if( strlen(zHttpHost)+strlen(zRoot)+10 >= sizeof(zLine) ){
NotFound(__LINE__);
}else{
sprintf(zLine, "%s/%s", zRoot, zHttpHost);
for(i=strlen(zRoot)+1; zLine[i] && zLine[i]!=':'; i++){
int c = zLine[i];
if( !isalnum(c) ){
zLine[i] = '_';
}else if( isupper(c) ){
zLine[i] = tolower(c);
}
}
strcpy(&zLine[i], ".website");
}
if( stat(zLine,&statbuf) && !S_ISDIR(statbuf.st_mode) ){
sprintf(zLine, "%s/default.website", zRoot);
if( stat(zLine,&statbuf) && !S_ISDIR(statbuf.st_mode) ){
NotFound(__LINE__);
}
}
zHome = StrDup(zLine);
/* Change directories to the root of the HTTP filesystem
*/
if( chdir(zHome)!=0 ){
char zBuf[1000];
Malfunction(__LINE__, "cannot chdir to [%s] from [%s]",
zHome, getcwd(zBuf,999));
}
/* Locate the file in the filesystem. We might have to append
** the name "index.html" in order to find it. Any excess path
** information is put into the zPathInfo variable.
*/
zLine[0] = '.';
i = 0;
while( zScript[i] ){
while( zScript[i] && zScript[i]!='/' ){
zLine[i+1] = zScript[i];
i++;
}
zLine[i+1] = 0;
if( stat(zLine,&statbuf)!=0 ){
NotFound(__LINE__);
}
if( S_ISREG(statbuf.st_mode) ){
if( access(zLine,R_OK) ){
NotFound(__LINE__);
}
zRealScript = StrDup(&zLine[1]);
break;
}
if( zScript[i]==0 || zScript[i+1]==0 ){
strcpy(&zLine[i+1],"/index.html");
if( stat(zLine,&statbuf)!=0 || !S_ISREG(statbuf.st_mode)
|| access(zLine,R_OK) ){
strcpy(&zLine[i+1],"/index.cgi");
if( stat(zLine,&statbuf)!=0 || !S_ISREG(statbuf.st_mode)
|| access(zLine,R_OK) ){
NotFound(__LINE__);
}
}
zRealScript = StrDup(&zLine[1]);
if( zScript[i]==0 ){
/* If the requested URL does not end with "/" but we had to
** append "index.html", then a redirect is necessary. Otherwise
** none of the relative URLs in the delivered document will be
** correct. */
Redirect(zRealScript, 1);
return;
}
break;
}
zLine[i+1] = zScript[i];
i++;
}
zFile = StrDup(zLine);
zPathInfo = StrDup(&zScript[i]);
lenFile = strlen(zFile);
zDir = StrDup(zFile);
for(i=strlen(zDir)-1; i>0 && zDir[i]!='/'; i--){};
if( i==0 ){
strcpy(zDir,"/");
}else{
zDir[i] = 0;
}
/* Take appropriate action
*/
if( (statbuf.st_mode & 0100)==0100 && access(zFile,X_OK)==0 ){
/*
** The followings static variables are used to setup the environment
** for the CGI script
*/
static char *default_path = "/bin:/usr/bin";
static char *gateway_interface = "CGI/1.0";
static struct {
char *zEnvName;
char **pzEnvValue;
} cgienv[] = {
{ "CONTENT_LENGTH", &zContentLength },
{ "CONTENT_TYPE", &zContentType },
{ "DOCUMENT_ROOT", &zHome },
{ "GATEWAY_INTERFACE", &gateway_interface },
{ "HTTP_ACCEPT", &zAccept },
{ "HTTP_COOKIE", &zCookie },
{ "HTTP_HOST", &zHttpHost },
{ "HTTP_REFERER", &zReferer },
{ "HTTP_USER_AGENT", &zAgent },
{ "PATH", &default_path },
{ "PATH_INFO", &zPathInfo },
{ "QUERY_STRING", &zQueryString },
{ "REMOTE_ADDR", &zRemoteAddr },
{ "REQUEST_METHOD", &zMethod },
{ "REQUEST_URI", &zScript },
{ "SCRIPT_DIRECTORY", &zDir },
{ "SCRIPT_FILENAME", &zFile },
{ "SCRIPT_NAME", &zRealScript },
{ "SERVER_NAME", &zServerName },
{ "SERVER_PORT", &zServerPort },
{ "SERVER_PROTOCOL", &zProtocol },
};
char *zBaseFilename; /* Filename without directory prefix */
/* If its executable, it must be a CGI program. Start by
** changing directories to the directory holding the program.
*/
if( chdir(zDir) ){
char zBuf[1000];
Malfunction(__LINE__, "cannot chdir to [%s] from [%s]",
zDir, getcwd(zBuf,999));
}
/* Setup the environment appropriately.
*/
for(i=0; i<sizeof(cgienv)/sizeof(cgienv[0]); i++){
if( *cgienv[i].pzEnvValue ){
SetEnv(cgienv[i].zEnvName,*cgienv[i].pzEnvValue);
}
}
if( useHttps ){
putenv("HTTPS=on");
}
/*
** Abort with an error if the CGI script is writable by anyone other
** than its owner.
*/
if( statbuf.st_mode & 0022 ){
CgiScriptWritable();
}
/* For the POST method all input has been written to a temporary file,
** so we have to redirect input to the CGI script from that file.
*/
if( zMethod[0]=='P' ){
dup(0);
close(0);
open(zTmpNam, O_RDONLY);
}
for(i=strlen(zFile)-1; i>=0 && zFile[i]!='/'; i--){}
zBaseFilename = &zFile[i+1];
if( i>=0 && strncmp(zBaseFilename,"nph-",4)==0 ){
/* If the name of the CGI script begins with "nph-" then we are
** dealing with a "non-parsed headers" CGI script. Just exec()
** it directly and let it handle all its own header generation.
*/
execl(zBaseFilename,zBaseFilename,(char*)0);
/* NOTE: No log entry written for nph- scripts */
exit(0);
}
/* Fall thru to here only if this process (the server) is going
** to read and augment the header sent back by the CGI process.
** Open a pipe to receive the output from the CGI process. Then
** fork the CGI process. Once everything is done, we should be
** able to read the output of CGI on the "in" stream.
*/
{
int px[2];
pipe(px);
if( fork()==0 ){
close(px[0]);
close(1);
dup(px[1]);
close(px[1]);
execl(zBaseFilename, zBaseFilename, (char*)0);
exit(0);
}
close(px[1]);
in = fdopen(px[0], "r");
}
if( in==0 ){
CgiError();
}
/* Read and process the first line of the header returned by the
** CGI script.
*/
alarm(15);
while( fgets(zLine,sizeof(zLine),in) ){
if( strncmp(zLine,"Location:",9)==0 ){
int i;
RemoveNewline(zLine);
z = &zLine[10];
while( isspace(*z) ){ z++; }
for(i=0; z[i]; i++){
if( z[i]=='?' ){
zQuerySuffix = StrDup("");
}
}
if( z[0]=='/' && z[1]=='/' ){
/* The scheme is missing. Add it in before redirecting */
StartResponse("302 Redirect");
nOut += printf("Location: %s:%s%s\r\n",zHttp,z,zQuerySuffix);
break; /* DK */
MakeLogEntry(0);
return;
}else if( z[0]=='/' ){
/* The scheme and network location are missing but we have
** an absolute path. */
Redirect(z, 0); /* DK */
break;
}
/* Check to see if there is a scheme prefix */
for(i=0; z[i] && z[i]!=':' && z[i]!='/'; i++){}
if( z[i]==':' ){
/* We have a scheme. Assume there is an absolute URL */
StartResponse("302 Redirect");
nOut += printf("Location: %s%s\r\n",z,zQuerySuffix);
break; /* DK */
MakeLogEntry(0);
return;
}
/* Must be a relative pathname. Construct the absolute pathname
** and redirect to it. */
i = strlen(zRealScript);
while( i>0 && zRealScript[i-1]!='/' ){ i--; }
while( i>0 && zRealScript[i-1]=='/' ){ i--; }
while( *z=='.' ){
if( z[1]=='/' ){
z += 2;
}else if( z[1]=='.' && z[2]=='/' ){
while( i>0 && zRealScript[i-1]!='/' ){ i--; }
while( i>0 && zRealScript[i-1]=='/' ){ i--; }
z += 3;
}else{
break;
}
}
StartResponse("302 Redirect");
nOut += printf("Location: %s://%s",zHttp,zServerName);
if( strcmp(zServerPort,"80") ){
nOut += printf(":%s",zServerPort);
}
nOut += printf("%.*s/%s%s\r\n\r\n",i,zRealScript,z,zQuerySuffix);
MakeLogEntry(0);
return;
}else if( strncmp(zLine,"Status:",7)==0 ){
int i;
for(i=7; isspace(zLine[i]); i++){}
nOut += printf("%s %s", zProtocol, &zLine[i]);
strncpy(zReplyStatus, &zLine[i], 3);
zReplyStatus[3] = 0;
statusSent = 1;
break;
}else{
int i;
StartResponse("200 OK");
nOut += printf("%s",zLine);
for(i=0; zLine[i] && !isspace(zLine[i]) && zLine[i]!=':'; i++){}
if( i<2 || zLine[i]!=':' ) break;
}
}
/* Copy everything else thru without change or analysis.
*/
alarm(60*5);
while( (c = getc(in))!=EOF ){
putc(c,stdout);
nOut++;
}
fclose(in);
}else{
/* If it isn't executable then it
** must a simple file that needs to be copied to output.
*/
const char *zContentType = GetMimeType(zFile, lenFile);
if( zTmpNam ) unlink(zTmpNam);
in = fopen(zFile,"r");
if( in==0 ) NotFound(__LINE__);
StartResponse("200 OK");
nOut += DateTag("Last-Modified", statbuf.st_mtime);
nOut += printf("Content-type: %s\r\n",zContentType);
nOut += printf("Content-length: %d\r\n\r\n",(int)statbuf.st_size);
fflush(stdout);
if( strcmp(zMethod,"HEAD")==0 ){
MakeLogEntry(0);
fclose(in);
return;
}
alarm(30 + statbuf.st_size/1000);
#ifdef linux
{
off_t offset = 0;
nOut += sendfile(fileno(stdout), fileno(in), &offset, statbuf.st_size);
}
#else
while( (c = getc(in))!=EOF ){
putc(c,stdout);
nOut++;
}
#endif
fclose(in);
}
fflush(stdout);
MakeLogEntry(0);
/* The next request must arrive within 30 seconds or we close the connection
*/
omitLog = 1;
alarm(30);
}
int main(int argc, char **argv){
int i; /* Loop counter */
char *zPermUser = 0; /* Run daemon with this user's permissions */
/* Record the time when processing begins.
*/
time(&beginTime);
/* Parse command-line arguments
*/
while( argc>2 && argv[1][0]=='-' ){
if( strcmp(argv[1],"-user")==0 ){
zPermUser = argv[2];
argv += 2;
argc -= 2;
}else if( strcmp(argv[1],"-root")==0 ){
zRoot = argv[2];
argv += 2;
argc -= 2;
}else if( strcmp(argv[1],"-logfile")==0 ){
zLogFile = argv[2];
argv += 2;
argc -= 2;
}else if( strcmp(argv[1],"-https")==0 ){
useHttps = atoi(argv[2]);
zHttp = useHttps ? "http" : "https";
argv += 2;
argc -= 2;
}else{
Malfunction(__LINE__, "unknown argument: [%s]", argv[1]);
}
}
if( zRoot==0 ){
Malfunction(__LINE__, "no root directory specified");
}
/* Change directories to the root of the HTTP filesystem
*/
if( chdir(zRoot)!=0 ){
Malfunction(__LINE__, "cannot change to directory [%s]", zRoot);
}
/* Attempt to go into a chroot jail as user zPermUser
*/
if( zPermUser ){
struct passwd *pwd = getpwnam(zPermUser);
if( pwd ){
if( chroot(".")<0 ){
Malfunction(__LINE__, "unable to create chroot jail");
}
setgid(pwd->pw_gid);
setuid(pwd->pw_uid);
zRoot = "";
}else{
Malfunction(__LINE__, "no home directory for user [%s]", zPermUser);
}
}
if( getuid()==0 ){
Malfunction(__LINE__, "cannot run as root");
}
/* Get the IP address from when the request originates
*/
{
struct sockaddr_in remoteName;
int size = sizeof(struct sockaddr_in);
if( getpeername(fileno(stdin), (struct sockaddr*)&remoteName, &size)>=0 ){
zRemoteAddr = StrDup(inet_ntoa(remoteName.sin_addr));
}
}
/* Process the input stream */
for(i=0; i<100; i++){
ProcessOneRequest(0);
}
ProcessOneRequest(1);
exit(0);
}
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