adding

diff --git a/contrib/rredir.c b/contrib/rredir.c
new file mode 100644 (file)
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--- /dev/null
+++ b/contrib/rredir.c
@@ -0,0 +1,95 @@
+#ifdef MAIL_HEADERS
+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.
+#endif
+
+/*
+** 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;
+}