In addition to FTP, other connection based protocols such as IMAP, POP3,
SMTP, SCP, SFTP and LDAP require a new connection when different log-in
credentials are specified. Fixed the detection logic to include these
other protocols.

Bug: http://curl.haxx.se/docs/adv_20140326A.html

[upstream commit 517b06d657aceb11a234b05cc891170c367ab80d]

Signed-off-by: Kamil Dudka <kdudka_at_redhat.com>

---
 lib/http.c    |    2 +-
 lib/url.c     |    6 +++---
 lib/urldata.h |    2 ++
 3 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/lib/http.c b/lib/http.c
index f4b7a48..c78036b 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -142,7 +142,7 @@ const struct Curl_handler Curl_handler_https = {
   ZERO_NULL,                            /* readwrite */
   PORT_HTTPS,                           /* defport */
   CURLPROTO_HTTP | CURLPROTO_HTTPS,     /* protocol */
-  PROTOPT_SSL                           /* flags */
+  PROTOPT_SSL | PROTOPT_CREDSPERREQUEST /* flags */
 };
 #endif
 
diff --git a/lib/url.c b/lib/url.c
index 9690dfa..0174ff4 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2961,10 +2961,10 @@ ConnectionExists(struct SessionHandle *data,
               continue;
             }
           }
-          if((needle->handler->protocol & CURLPROTO_FTP) ||
+          if((!(needle->handler->flags & PROTOPT_CREDSPERREQUEST)) ||
              ((needle->handler->protocol & CURLPROTO_HTTP) && wantNTLM)) {
-            /* This is FTP or HTTP+NTLM, verify that we're using the same name
-               and password as well */
+            /* This protocol requires credentials per connection or is HTTP+NTLM,
+               so verify that we're using the same name and password as well */
             if(!strequal(needle->user, check->user) ||
                !strequal(needle->passwd, check->passwd)) {
               /* one of them was different */
diff --git a/lib/urldata.h b/lib/urldata.h
index d597c67..cbf4102 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -755,6 +755,8 @@ struct Curl_handler {
                                       gets a default */
 #define PROTOPT_NOURLQUERY (1<<6)   /* protocol can't handle
                                         url query strings (?foo=bar) ! */
+#define PROTOPT_CREDSPERREQUEST (1<<7) /* requires login creditials per request
+                                          as opposed to per connection */
 
 
 /* return the count of bytes sent, or -1 on error */
-- 
1.7.1
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