📄 nph-redirect.c

📁 修改后的thttp
💻 C
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/* nph-redirect - simple redirection CGI program**** Copyright (C) 1995 by Jef Poskanzer <jef@acme.com>.  All rights reserved.**** Redistribution and use in source and binary forms, with or without** modification, are permitted provided that the following conditions** are met:** 1. Redistributions of source code must retain the above copyright**    notice, this list of conditions and the following disclaimer.** 2. Redistributions in binary form must reproduce the above copyright**    notice, this list of conditions and the following disclaimer in the**    documentation and/or other materials provided with the distribution.**** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE** ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF** SUCH DAMAGE.*//* Three steps to set up a redirection:**  1. Make sure your web server is set up to allow CGI programs.**  2. Make a symbolic link from the file you want to redirect,**     pointing at this program in the CGI bin directory.**  3. Add an entry to the file ".redirects" in the directory where your**     http server runs CGI programs.  For most servers, this is the**     directory where the given CGI program lives.  The format of the**     file is a bunch of lines with a filename, whitespace, and the new**     URL.  For example:/test/oldfile.html    http://www.acme.com/test/newfile.html**     The easiest way to figure out precisely what filename to put into**     .redirects is to set up the symlink and then click on it.  You'll get**     back a "404 Not Found" page which includes the filename as received by**     the redirect program, and that's what you want to use.**** Note: this is designed for thttpd (http://www.acme.com/software/thttpd/)** and using it with other web servers may require some hacking.  A possible** gotcha is with the symbolic link from the old file pointing at this** script - servers other than thttpd may not allow that link to be run** as a CGI program, because they don't check the link to see that it** points into the allowed CGI directory.**** Note two: It would be really cool to have this program look for** the .redirects file in the same directory as the file being redirected,** instead of in the binaries directory.  Unfortunately, this appears** to be impossible with the information CGI gives, plus the non-standardized** but widespread practice of running CGI programs in the directory where** the binary lives.  Perhaps CGI 1.2 will address this.*/#include <sys/types.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include "config.h"static char* argv0;static voidinternal_error( char* reason )    {    char* title = "500 Internal Error";    (void) printf( "\HTTP/1.0 %s\n\Content-type: text/html\n\\n\<HTML><HEAD><TITLE>%s</TITLE></HEAD>\n\<BODY><H2>%s</H2>\n\Something unusual went wrong during a redirection request:\n\<BLOCKQUOTE>\n\%s\n\</BLOCKQUOTE>\n\</BODY></HTML>\n", title, title, title, reason );    }static voidnot_found( char* script_name )    {    char* title = "404 Not Found";    (void) printf( "\HTTP/1.0 %s\n\Content-type: text/html\n\\n\<HTML><HEAD><TITLE>%s</TITLE></HEAD>\n\<BODY><H2>%s</H2>\n\The requested filename, %s, is set up to be redirected to another URL;\n\however, the new URL has not yet been specified.\n\</BODY></HTML>\n", title, title, title, script_name );    }static voidmoved( char* script_name, char* url )    {    char* title = "301 Moved";    (void) printf( "\HTTP/1.0 %s\n\Location: %s\n\Content-type: text/html\n\\n\<HTML><HEAD><TITLE>%s</TITLE></HEAD>\n\<BODY><H2>%s</H2>\n\The requested filename, %s, has moved to a new URL:\n\<A HREF=\"%s\">%s</A>.\n\</BODY></HTML>\n", title, url, title, title, script_name, url, url );    }	intmain( int argc, char** argv )    {    char* script_name;    char* path_info;    char* cp;    FILE* fp;    char buf[5000], file[5000], url[5000];    argv0 = argv[0];    /* Get the name that we were run as, which is the filename being    ** redirected.    */    script_name = getenv( "SCRIPT_NAME" );    if ( script_name == (char*) 0 )	{	internal_error( "Couldn't get SCRIPT_NAME environment variable." );	exit( 1 );	}    /* Append the PATH_INFO, if any.  This allows redirection of whole    ** directories.    */    path_info = getenv( "PATH_INFO" );    if ( path_info != (char*) 0 )	{	cp = (char*) malloc( strlen( script_name ) + strlen( path_info ) + 1 );	if ( cp == (char*) 0 )	    {	    internal_error( "Out of memory." );	    exit( 1 );	    }	(void) sprintf( cp, "%s%s", script_name, path_info );	script_name = cp;	}    /* Open the redirects file. */    fp = fopen( ".redirects", "r" );    if ( fp == (FILE*) 0 )	{	internal_error( "Couldn't open .redirects file." );	exit( 1 );	}    /* Search the file for a matching entry. */    while ( fgets( buf, sizeof(buf), fp ) != (char*) 0 )	{	/* Remove comments. */	cp = strchr( buf, '#' );	if ( cp != (char*) 0 )	    *cp = '\0';	/* Skip leading whitespace. */	cp = buf;	cp += strspn( cp, " \t" );	/* Check for blank line. */	if ( *cp != '\0' )	    {	    /* Parse line. */	    if ( sscanf( cp, "%[^ \t\n] %[^ \t\n]", file, url ) == 2 )		{		/* Check for match. */		if ( strcmp( file, script_name ) == 0 )		    {		    /* Got it. */		    moved( script_name, url );		    exit( 0 );		    }		}	    }	}    /* No match found. */    not_found( script_name );    exit( 1 );    }
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