Changed the handling of read/write errors in Curl_perform() to allow a

a fresh connection to be made in such cases and the request retransmitted.
This should fix test case 160.  Added test case 1079 in an attempt to
test a similar connection dropping scenario, but as a race condition, it's
hard to test reliably.

5 files changed, 88 insertions, 8 deletions

diff --git a/CHANGES b/CHANGES
index 3b15134f1..2aeba086c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6,6 +6,13 @@
 
                                   Changelog
 
+Daniel Fandrich (7 Oct 2008)
+- Changed the handling of read/write errors in Curl_perform() to allow a
+  a fresh connection to be made in such cases and the request retransmitted.
+  This should fix test case 160.  Added test case 1079 in an attempt to
+  test a similar connection dropping scenario, but as a race condition, it's
+  hard to test reliably.
+
 Daniel Stenberg (7 Oct 2008)
 - Fixed CURLINFO_PRIMARY_IP: When libcurl created a connection to host A then
   the app re-used the handle to do a connection to host B and then again
diff --git a/lib/transfer.c b/lib/transfer.c
index 8d2d0db82..2f4ce692d 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -1848,11 +1848,9 @@ Transfer(struct connectdata *conn)
       /* The EINTR is not serious, and it seems you might get this more
          often when using the lib in a multi-threaded environment! */
       if(SOCKERRNO == EINTR)
-        ;
-      else
+        continue;
 #endif
-        done = TRUE; /* no more read or write */
-      continue;
+      return CURLE_RECV_ERROR;  /* indicate a network problem */
     case 0:  /* timeout */
     default: /* readable descriptors */
 
@@ -2465,15 +2463,16 @@ CURLcode Curl_perform(struct SessionHandle *data)
 
       if(res == CURLE_OK) {
         res = Transfer(conn); /* now fetch that URL please */
-        if(res == CURLE_OK) {
+        if((res == CURLE_OK) || (res == CURLE_RECV_ERROR)) {
           bool retry = Curl_retry_request(conn, &newurl);
 
           if(retry) {
+            res = CURLE_OK;
             follow = FOLLOW_RETRY;
             if (!newurl)
               res = CURLE_OUT_OF_MEMORY;
           }
-          else {
+          else if (res == CURLE_OK) {
             /*
              * We must duplicate the new URL here as the connection data may
              * be free()ed in the Curl_done() function. We prefer the newurl
diff --git a/tests/data/DISABLED b/tests/data/DISABLED
index 9fe82a528..2055e9f16 100644
--- a/tests/data/DISABLED
+++ b/tests/data/DISABLED
@@ -3,4 +3,3 @@
 # test cases are run by runtests.pl. Just add the plain test case numbers, one
 # per line.
 # Lines starting with '#' letters are treated as comments.
-160
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index 3af445f60..dd3c537fb 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -57,7 +57,7 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46	   \
  test1048 test1049 test1050 test1051 test1052 test1053 test1054 test1055   \
  test1056 test1057 test1058 test1059 test1060 test1061 test1062 test1063   \
  test1064 test1065 test1066 test1067 test1068 test1069 test1070 test1071   \
- test1072 test1073 test1074 test1075 test1076 test1077 test1078
+ test1072 test1073 test1074 test1075 test1076 test1077 test1078 test1079
 
 filecheck:
 	@mkdir test-place; \
diff --git a/tests/data/test1079 b/tests/data/test1079
new file mode 100644
index 000000000..c188e792e
--- /dev/null
+++ b/tests/data/test1079
@@ -0,0 +1,75 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+HTTP Digest auth
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 401 Authorization Required swsclose

+Server: Apache/1.3.27 (Darwin) PHP/4.1.2

+WWW-Authenticate: Digest realm="testrealm", nonce="1053604145"

+Content-Type: text/plain; charset=iso-8859-1

+Content-Length: 26

+

+This is not the real page
+</data>
+
+# This is supposed to be returned when the server gets a
+# Authorization: Digest line passed-in from the client
+# Send nothing to force an error code 52 reply
+<data1000>
+</data1000>
+
+<datacheck>
+HTTP/1.1 401 Authorization Required swsclose

+Server: Apache/1.3.27 (Darwin) PHP/4.1.2

+WWW-Authenticate: Digest realm="testrealm", nonce="1053604145"

+Content-Type: text/plain; charset=iso-8859-1

+Content-Length: 26

+

+</datacheck>
+
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<features>
+crypto
+</features>
+ <name>
+HTTP retry after closed connection and empty response
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/1079 -u testuser:testpass --digest
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+52
+</errorcode>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1079 HTTP/1.1

+Host: %HOSTIP:%HTTPPORT

+Accept: */*

+

+GET /1079 HTTP/1.1

+Authorization: Digest username="testuser", realm="testrealm", nonce="1053604145", uri="/1079", response="e340c7cdca0950462070f46ee139e9f7"

+Host: %HOSTIP:%HTTPPORT

+Accept: */*

+

+</protocol>
+</verify>
+</testcase>