Nis Jorgensen filed bug report #1338648

(http://curl.haxx.se/bug/view.cgi?id=1338648) which really is more of a
feature request, but anyway. It pointed out that --max-redirs did not allow
it to be set to 0, which then would return an error code on the first
Location: found. Based on Nis' patch, now libcurl supports CURLOPT_MAXREDIRS
set to 0, or -1 for infinity. Added test case 274 to verify.

CHANGES

@@ -9,6 +9,13 @@
 
 
 Daniel (27 October 2005)
+- Nis Jorgensen filed bug report #1338648
+  (http://curl.haxx.se/bug/view.cgi?id=1338648) which really is more of a
+  feature request, but anyway. It pointed out that --max-redirs did not allow
+  it to be set to 0, which then would return an error code on the first
+  Location: found. Based on Nis' patch, now libcurl supports CURLOPT_MAXREDIRS
+  set to 0, or -1 for infinity. Added test case 274 to verify.
+
 - tommink[at]post.pl reported in bug report #1337723
   (http://curl.haxx.se/bug/view.cgi?id=1337723) that curl could not upload
   binary data from stdin on Windows if the data contained control-Z (hex 1a)

docs/curl.1

@@ -1127,7 +1127,8 @@ If this option is used several times, the last one will be used.
 .IP "--max-redirs <num>"
 Set maximum number of redirection-followings allowed. If \fI-L/--location\fP
 is used, this option can be used to prevent curl from following redirections
-\&"in absurdum".
+\&"in absurdum". By default, the limit is set to 50 redirections. Set this
+option to -1 to make it limitless.
 
 If this option is used several times, the last one will be used.
 .IP "-0/--http1.0"

docs/libcurl/curl_easy_setopt.3

@@ -21,7 +21,7 @@
 .\" * $Id$
 .\" **************************************************************************
 .\"
-.TH curl_easy_setopt 3 "22 Sep 2005" "libcurl 7.14.2" "libcurl Manual"
+.TH curl_easy_setopt 3 "27 Oct 2005" "libcurl 7.14.2" "libcurl Manual"
 .SH NAME
 curl_easy_setopt - set options for a curl easy handle
 .SH SYNOPSIS
@@ -516,7 +516,9 @@ option is meaningful only when setting \fICURLOPT_FOLLOWLOCATION\fP.
 Pass a long. The set number will be the redirection limit. If that many
 redirections have been followed, the next redirect will cause an error
 (\fICURLE_TOO_MANY_REDIRECTS\fP). This option only makes sense if the
-\fICURLOPT_FOLLOWLOCATION\fP is used at the same time.
+\fICURLOPT_FOLLOWLOCATION\fP is used at the same time. Added in 7.15.1:
+Setting the limit to 0 will make libcurl refuse any redirect. Set it to -1 for
+an infinite number of redirects (which is the default)
 .IP CURLOPT_PUT
 A non-zero parameter tells the library to use HTTP PUT to transfer data. The
 data should be set with \fICURLOPT_READDATA\fP and \fICURLOPT_INFILESIZE\fP.

lib/transfer.c

@@ -1765,7 +1765,7 @@ CURLcode Curl_follow(struct SessionHandle *data,
   size_t newlen;
   char *newest;
 
-  if (data->set.maxredirs &&
+  if ((data->set.maxredirs != -1) &&
       (data->set.followlocation >= data->set.maxredirs)) {
     failf(data,"Maximum (%d) redirects followed", data->set.maxredirs);
     return CURLE_TOO_MANY_REDIRECTS;

lib/url.c

@@ -320,7 +320,7 @@ CURLcode Curl_open(struct SessionHandle **curl)
 
     data->set.infilesize = -1; /* we don't know any size */
     data->set.postfieldsize = -1;
-
+    data->set.maxredirs = -1; /* allow any amount by default */
     data->state.current_speed = -1; /* init to negative == impossible */
 
     data->set.httpreq = HTTPREQ_GET; /* Default HTTP request */

lib/urldata.h

@@ -956,7 +956,8 @@ struct UserDefined {
   char *set_range;   /* range, if used. See README for detailed specification
                         on this syntax. */
   long followlocation; /* as in HTTP Location: */
-  long maxredirs;    /* maximum no. of http(s) redirects to follow */
+  long maxredirs;    /* maximum no. of http(s) redirects to follow, set to -1
+                        for infinity */
   char *set_referer; /* custom string */
   bool free_referer; /* set TRUE if 'referer' points to a string we
                         allocated */

src/main.c

@@ -3211,6 +3211,7 @@ operate(struct Configurable *config, int argc, char *argv[])
   config->create_dirs=FALSE;
   config->lastrecvtime = curlx_tvnow();
   config->lastsendtime = curlx_tvnow();
+  config->maxredirs = DEFAULT_MAXREDIRS;
 
   if(argc>1 &&
      (!curlx_strnequal("--", argv[1], 2) && (argv[1][0] == '-')) &&
@@ -3803,11 +3804,7 @@ operate(struct Configurable *config, int argc, char *argv[])
           curl_easy_setopt(curl, CURLOPT_FILETIME, TRUE);
         }
 
-        if (config->maxredirs)
-          curl_easy_setopt(curl, CURLOPT_MAXREDIRS, config->maxredirs);
-        else
-          curl_easy_setopt(curl, CURLOPT_MAXREDIRS, DEFAULT_MAXREDIRS);
-
+        curl_easy_setopt(curl, CURLOPT_MAXREDIRS, config->maxredirs);
         curl_easy_setopt(curl, CURLOPT_CRLF, config->crlf);
         curl_easy_setopt(curl, CURLOPT_QUOTE, config->quote);
         curl_easy_setopt(curl, CURLOPT_POSTQUOTE, config->postquote);

tests/data/Makefile.am

@@ -33,4 +33,6 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46	   \
  test237 test238 test239 test243 test245 test246 test247 test248 test249   \
  test250 test251 test252 test253 test254 test255 test521 test522 test523   \
  test256 test257 test258 test259 test260 test261 test262 test263 test264   \
- test265 test266 test267 test268 test269 test270 test271 test272 test273
+ test265 test266 test267 test268 test269 test270 test271 test272 test273   \
+ test274
+

tests/data/test274

@@ -0,0 +1,50 @@
+<info>
+<keywords>
+HTTP
+HTTP GET
+followlocation
+--max-redirs
+</keywords>
+</info>
+# Server-side
+<reply>
+<data>
+HTTP/1.1 301 This is a weirdo text message swsclose
+Server: test-server/fake
+Location: data/reply/25
+Content-Length: 0
+Connection: close
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+HTTP Location: following with --max-redirs 0
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/want/274 -L --max-redirs 0
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent: curl/.*
+</strip>
+<protocol>
+GET /want/274 HTTP/1.1
+User-Agent: curl/7.8.1-pre3 (sparc-sun-solaris2.7) libcurl 7.8.1-pre3 (OpenSSL 0.9.6a) (krb4 enabled)
+Host: 127.0.0.1:%HTTPPORT
+Accept: */*
+
+</protocol>
+
+<errorcode>
+47
+</errorcode>
+</verify>