remote-curl: refactor smart-http discovery
After making initial contact with an http server, we have to decide if
the server supports smart-http, and if so, which version. Our rules are
a bit inconsistent:
1. For v0, we require that the content-type indicates a smart-http
response. We also require the response to look vaguely like a
pkt-line starting with "#". If one of those does not match, we fall
back to dumb-http.
But according to our http protocol spec[1]:
Dumb servers MUST NOT return a return type starting with
`application/x-git-`.
If we see the expected content-type, we should consider it
smart-http. At that point we can parse the pkt-line for real, and
complain if it is not syntactically valid.
2. For v2, we do not actually check the content-type. Our v2 protocol
spec says[2]:
When using the http:// or https:// transport a client makes a
"smart" info/refs request as described in `http-protocol.txt`[...]
and the http spec is clear that for a smart-http response[3]:
The Content-Type MUST be `application/x-$servicename-advertisement`.
So it is required according to the spec.
These inconsistencies were easy to miss because of the way the original
code was written as an inline conditional. Let's pull it out into its
own function for readability, and improve a few things:
- we now predicate the smart/dumb decision entirely on the presence of
the correct content-type
- we do a real pkt-line parse before deciding how to proceed (and die
if it isn't valid)
- use skip_prefix() for comparing service strings, instead of
constructing expected output in a strbuf; this avoids dealing with
memory cleanup
Note that this _is_ tightening what the client will allow. It's all
according to the spec, but it's possible that other implementations
might violate these. However, violating these particular rules seems
like an odd choice for a server to make.
[1] Documentation/technical/http-protocol.txt, l. 166-167
[2] Documentation/technical/protocol-v2.txt, l. 63-64
[3] Documentation/technical/http-protocol.txt, l. 247
Helped-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/remote-curl.c b/remote-curl.c
index 2e04d53..c78ba83 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -331,9 +331,63 @@
return 0;
}
+static void check_smart_http(struct discovery *d, const char *service,
+ struct strbuf *type)
+{
+ const char *p;
+ struct packet_reader reader;
+
+ /*
+ * If we don't see x-$service-advertisement, then it's not smart-http.
+ * But once we do, we commit to it and assume any other protocol
+ * violations are hard errors.
+ */
+ if (!skip_prefix(type->buf, "application/x-", &p) ||
+ !skip_prefix(p, service, &p) ||
+ strcmp(p, "-advertisement"))
+ return;
+
+ packet_reader_init(&reader, -1, d->buf, d->len,
+ PACKET_READ_CHOMP_NEWLINE |
+ PACKET_READ_DIE_ON_ERR_PACKET);
+ if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
+ die("invalid server response; expected service, got flush packet");
+
+ if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
+ /*
+ * The header can include additional metadata lines, up
+ * until a packet flush marker. Ignore these now, but
+ * in the future we might start to scan them.
+ */
+ for (;;) {
+ packet_reader_read(&reader);
+ if (reader.pktlen <= 0) {
+ break;
+ }
+ }
+
+ /*
+ * v0 smart http; callers expect us to soak up the
+ * service and header packets
+ */
+ d->buf = reader.src_buffer;
+ d->len = reader.src_len;
+ d->proto_git = 1;
+
+ } else if (starts_with(reader.line, "version 2")) {
+ /*
+ * v2 smart http; do not consume version packet, which will
+ * be handled elsewhere.
+ */
+ d->proto_git = 1;
+
+ } else {
+ die("invalid server response; got '%s'", reader.line);
+ }
+}
+
static struct discovery *discover_refs(const char *service, int for_push)
{
- struct strbuf exp = STRBUF_INIT;
struct strbuf type = STRBUF_INIT;
struct strbuf charset = STRBUF_INIT;
struct strbuf buffer = STRBUF_INIT;
@@ -405,47 +459,8 @@
last->buf_alloc = strbuf_detach(&buffer, &last->len);
last->buf = last->buf_alloc;
- strbuf_addf(&exp, "application/x-%s-advertisement", service);
- if (maybe_smart &&
- (5 <= last->len && last->buf[4] == '#') &&
- !strbuf_cmp(&exp, &type)) {
- struct packet_reader reader;
- packet_reader_init(&reader, -1, last->buf, last->len,
- PACKET_READ_CHOMP_NEWLINE |
- PACKET_READ_DIE_ON_ERR_PACKET);
-
- /*
- * smart HTTP response; validate that the service
- * pkt-line matches our request.
- */
- if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
- die("invalid server response; expected service, got flush packet");
-
- strbuf_reset(&exp);
- strbuf_addf(&exp, "# service=%s", service);
- if (strcmp(reader.line, exp.buf))
- die("invalid server response; got '%s'", reader.line);
- strbuf_release(&exp);
-
- /* The header can include additional metadata lines, up
- * until a packet flush marker. Ignore these now, but
- * in the future we might start to scan them.
- */
- for (;;) {
- packet_reader_read(&reader);
- if (reader.pktlen <= 0) {
- break;
- }
- }
-
- last->buf = reader.src_buffer;
- last->len = reader.src_len;
-
- last->proto_git = 1;
- } else if (maybe_smart &&
- last->len > 5 && starts_with(last->buf + 4, "version 2")) {
- last->proto_git = 1;
- }
+ if (maybe_smart)
+ check_smart_http(last, service, &type);
if (last->proto_git)
last->refs = parse_git_refs(last, for_push);
@@ -453,7 +468,6 @@
last->refs = parse_info_refs(last);
strbuf_release(&refs_url);
- strbuf_release(&exp);
strbuf_release(&type);
strbuf_release(&charset);
strbuf_release(&effective_url);
