cookie: Stop exporting any-domain cookies

Prior to this change any-domain cookies (cookies without a domain that
are sent to any domain) were exported with domain name "unknown".

Bug: https://github.com/bagder/curl/issues/292

3 files changed, 13 insertions, 2 deletions

diff --git a/docs/examples/cookie_interface.c b/docs/examples/cookie_interface.c
index 2e7c66db2..28ee7817c 100644
--- a/docs/examples/cookie_interface.c
+++ b/docs/examples/cookie_interface.c
@@ -96,7 +96,12 @@ main(void)
       return 1;
     }
 
-    /* HTTP-header style cookie */
+    /* HTTP-header style cookie. If you use the Set-Cookie format and don't
+    specify a domain then the cookie is sent for any domain and will not be
+    modified, likely not what you intended. Starting in 7.43.0 any-domain
+    cookies will not be exported either. For more information refer to the
+    CURLOPT_COOKIELIST documentation.
+    */
     snprintf(nline, sizeof(nline),
       "Set-Cookie: OLD_PREF=3d141414bf4209321; "
       "expires=Sun, 17-Jan-2038 19:14:07 GMT; path=/; domain=.google.com");
diff --git a/docs/libcurl/opts/CURLOPT_COOKIELIST.3 b/docs/libcurl/opts/CURLOPT_COOKIELIST.3
index 1058936c7..937c79db8 100644
--- a/docs/libcurl/opts/CURLOPT_COOKIELIST.3
+++ b/docs/libcurl/opts/CURLOPT_COOKIELIST.3
@@ -43,6 +43,9 @@ transfer to that server, likely not what you intended. Either set a domain in
 Set-Cookie (doing that will include sub domains) or use the Netscape format as
 shown in EXAMPLE.
 
+Starting in 7.43.0 the aforementioned any-domain cookies will not appear in the
+lists exported by \fICURLINFO_COOKIELIST(3)\fP and \fICURLOPT_COOKIEJAR(3)\fP.
+
 Additionally, there are commands available that perform actions if you pass in
 these exact strings:
 .IP ALL
diff --git a/lib/cookie.c b/lib/cookie.c
index fd7ed4168..94f2a8b85 100644
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -1277,6 +1277,8 @@ static int cookie_output(struct CookieInfo *c, const char *dumphere)
     co = c->cookies;
 
     while(co) {
+      if(!co->domain)
+        continue;
       format_ptr = get_netscape_format(co);
       if(format_ptr == NULL) {
         fprintf(out, "#\n# Fatal libcurl error\n");
@@ -1310,7 +1312,8 @@ struct curl_slist *Curl_cookie_list(struct SessionHandle *data)
   c = data->cookies->cookies;
 
   while(c) {
-    /* fill the list with _all_ the cookies we know */
+    if(!c->domain)
+      continue;
     line = get_netscape_format(c);
     if(!line) {
       curl_slist_free_all(list);