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/* $Id: rredir.c,v 1.4 2001/01/07 10:57:13 hno Exp $ */
/*
* From: richard@hekkihek.hacom.nl (Richard Huveneers)
* To: squid-users@nlanr.net
* Subject: Save 15% on your bandwidth...
* Date: 12 Sep 1996 21:21:55 GMT
* ===========================================================================
*
* I have downloaded the multi-megabyte files from Netscape and Microsoft
* that our users like to download from every mirror in the world,
* defeating the usual caching.
*
* I put these files in a separate directory and installed a basic
* redirector for Squid that checks if the file (so hostname and pathname
* are disregarded) is present in this directory.
*
* After a few days of testing (the redirector looks very stable) it looks
* like this is saving us approx. 15% on our cache flow. Also, our own WWW
* server has become more popular than ever :)
*
* I'm sure this code will be useful to others too, so I've attached it at
* the end of this message. Improvements, extensions etc. are welcome.
*
* I'm going on holidays now, so I won't be able to respond to e-mail
* quickly.
*
* Enjoy, Richard.
*/
/*
* rredir - redirect to local directory
*
* version 0.1, 7 sep 1996
* - initial version (Richard Huveneers <Richard.Huveneers@hekkihek.hacom.nl>)
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#define ACCESS_LOCAL_DIR "/var/lib/httpd/htdocs/local/rredir"
#define REDIRECT_TO_URL "http://www.hacom.nl/local/rredir"
#define BUFFER_SIZE (16*1024)
int
main()
{
char buf[BUFFER_SIZE];
char *s, *t;
int tlu = 0;
/* make standard output line buffered */
if (setvbuf(stdout, NULL, _IOLBF, 0) != 0)
return 1;
/* speed up the access() calls below */
if (chdir(ACCESS_LOCAL_DIR) == -1)
return 1;
/* scan standard input */
while (fgets(buf, BUFFER_SIZE, stdin) != NULL) {
/* check for too long urls */
if (strchr(buf, '\n') == NULL) {
tlu = 1;
continue;
}
if (tlu)
goto dont_redirect;
/* determine end of url */
if ((s = strchr(buf, ' ')) == NULL)
goto dont_redirect;
*s = '\0';
/* determine first character of filename */
if ((s = strrchr(buf, '/')) == NULL)
goto dont_redirect;
s++;
/* security: do not redirect to hidden files, the current
* directory or the parent directory */
if (*s == '.' || *s == '\0')
goto dont_redirect;
/* map filename to lower case */
for (t = s; *t != '\0'; t++)
*t = (char) tolower((int) *t);
/* check for a local copy of this file */
if (access(s, R_OK) == 0) {
(void) printf("%s/%s\n", REDIRECT_TO_URL, s);
continue;
}
dont_redirect:
tlu = 0;
(void) printf("\n");
}
return 0;
}
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