http: Implement trailing headers for chunked transfers

This adds the CURLOPT_TRAILERDATA and CURLOPT_TRAILERFUNCTION
options that allow a callback based approach to sending trailing headers
with chunked transfers.

The test server (sws) was updated to take into account the detection of the
end of transfer in the case of trailing headers presence.

Test 1591 checks that trailing headers can be sent using libcurl.

Closes #3350

1 files changed, 106 insertions, 0 deletions

diff --git a/tests/libtest/lib1591.c b/tests/libtest/lib1591.c
new file mode 100644
index 000000000..7aba22337
--- /dev/null
+++ b/tests/libtest/lib1591.c
@@ -0,0 +1,106 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/*
+ * This unit test PUT http data over proxy. Proxy header will be different
+ * from server http header
+ */
+
+#include "test.h"
+#include <stdio.h>
+#include "memdebug.h"
+
+static char data [] = "Hello Cloud!\r\n";
+static size_t consumed = 0;
+
+static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+{
+  size_t  amount = nmemb * size; /* Total bytes curl wants */
+
+  if(consumed == strlen(data)) {
+    return 0;
+  }
+
+  if(amount > strlen(data)-consumed) {
+    amount = strlen(data);
+  }
+
+  consumed += amount;
+  (void)stream;
+  memcpy(ptr, data, amount);
+  return amount;
+}
+
+static int trailers_callback(struct curl_slist **list, void *userdata)
+{
+  (void)userdata;
+  *list = curl_slist_append(*list, "my-super-awesome-trailer: trail1");
+  *list = curl_slist_append(*list, "my-other-awesome-trailer: trail2");
+  return CURL_TRAILERFUNC_OK;
+}
+
+int test(char *URL)
+{
+  CURL *curl = NULL;
+  CURLcode res = CURLE_FAILED_INIT;
+  /* http and proxy header list*/
+  struct curl_slist *hhl = NULL;
+
+  if(curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK) {
+    fprintf(stderr, "curl_global_init() failed\n");
+    return TEST_ERR_MAJOR_BAD;
+  }
+
+
+  curl = curl_easy_init();
+  if(!curl) {
+    fprintf(stderr, "curl_easy_init() failed\n");
+    curl_global_cleanup();
+    return TEST_ERR_MAJOR_BAD;
+  }
+
+  hhl = curl_slist_append(hhl, "Trailer: my-super-awesome-trailer,"
+                               " my-other-awesome-trailer");
+  if(!hhl) {
+    goto test_cleanup;
+  }
+
+  test_setopt(curl, CURLOPT_URL, URL);
+  test_setopt(curl, CURLOPT_HTTPHEADER, hhl);
+  test_setopt(curl, CURLOPT_PUT, 1L);
+  test_setopt(curl, CURLOPT_READFUNCTION, read_callback);
+  test_setopt(curl, CURLOPT_TRAILERFUNCTION, trailers_callback);
+  test_setopt(curl, CURLOPT_TRAILERDATA, NULL);
+
+  res = curl_easy_perform(curl);
+
+test_cleanup:
+
+  curl_easy_cleanup(curl);
+
+  curl_slist_free_all(hhl);
+
+  curl_global_cleanup();
+
+  return (int)res;
+}
+