[PATCH] block/curl: set User-Agent header

Some HTTP servers and WAFs (e.g. Amazon CloudFront) reject
requests without a User-Agent header with 403 Forbidden. This
makes qemu-img info and other curl-based operations fail on
such URLs without any obvious indication of the root cause.

Set a "QEMU/<version>" User-Agent string on all curl handles
to ensure compatibility with these endpoints.

Signed-off-by: Vladimir Lobanov <[email protected]>
---
 block/curl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/curl.c b/block/curl.c
index 684c677ef7..1958eb80d1 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -482,6 +482,8 @@ static int curl_init_state(BDRVCURLState *s, CURLState *state)
             }
         }
         if (curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout) ||
+            curl_easy_setopt(state->curl, CURLOPT_USERAGENT,
+                             "QEMU/" QEMU_VERSION) ||
             curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
                              (void *)curl_read_cb) ||
             curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state) ||
-- 
2.50.1 (Apple Git-155)