netrc: 'default' with no credentials is not a match

Test 486 verifies.

Reported-by: Yihang Zhou

Closes #15908

lib/netrc.c

@@ -316,11 +316,16 @@ static int parsenetrc(struct store_netrc *store,
 
 out:
   Curl_dyn_free(&token);
-  if(!retcode && !password && our_login) {
-    /* success without a password, set a blank one */
-    password = strdup("");
-    if(!password)
-      retcode = 1; /* out of memory */
+  if(!retcode) {
+    if(!password && our_login) {
+      /* success without a password, set a blank one */
+      password = strdup("");
+      if(!password)
+        retcode = 1; /* out of memory */
+    }
+    else if(!login && !password)
+      /* a default with no credentials */
+      retcode = NETRC_FILE_MISSING;
   }
   if(!retcode) {
     /* success */

tests/data/Makefile.am

@@ -78,7 +78,7 @@ test444 test445 test446 test447 test448 test449 test450 test451 test452 \
 test453 test454 test455 test456 test457 test458 test459 test460 test461 \
 test462 test463 test467 test468 test469 test470 test471 test472 test473 \
 test474 test475 test476 test477 test478 test479 test480 test481 test482 \
-test483 test484 test485 \
+test483 test484 test485 test486 \
 test490 test491 test492 test493 test494 test495 test496 test497 test498 \
 test499 test500 test501 test502 test503 test504 test505 test506 test507 \
 test508 test509 test510 test511 test512 test513 test514 test515 test516 \

tests/data/test486

@@ -0,0 +1,105 @@
+<testcase>
+<info>
+<keywords>
+netrc
+HTTP
+</keywords>
+</info>
+#
+# Server-side
+<reply>
+<data crlf="yes">
+HTTP/1.1 301 Follow this you fool
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 6
+Connection: close
+Location: http://b.com/%TESTNUMBER0002
+
+-foo-
+</data>
+
+<data2 crlf="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 7
+Connection: close
+
+target
+</data2>
+
+<datacheck crlf="yes">
+HTTP/1.1 301 Follow this you fool
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 6
+Connection: close
+Location: http://b.com/%TESTNUMBER0002
+
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 7
+Connection: close
+
+target
+</datacheck>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+<features>
+proxy
+</features>
+<name>
+.netrc with redirect and "default" with no password or login
+</name>
+<command>
+--netrc --netrc-file %LOGDIR/netrc%TESTNUMBER -L -x http://%HOSTIP:%HTTPPORT/ http://a.com/
+</command>
+<file name="%LOGDIR/netrc%TESTNUMBER" >
+
+machine a.com
+  login alice
+  password alicespassword
+
+default
+
+</file>
+</client>
+
+<verify>
+<protocol>
+GET http://a.com/ HTTP/1.1
+Host: a.com
+Authorization: Basic %b64[alice:alicespassword]b64%
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://b.com/%TESTNUMBER0002 HTTP/1.1
+Host: b.com
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+</testcase>