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From: Max Kirillov <max@max630.net>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: git@vger.kernel.org, "Jeff King" <peff@peff.net>,
	"Jelmer Vernooij" <jelmer@jelmer.uk>,
	"Florian Manschwetus" <manschwetus@cs-software-gmbh.de>,
	"Max Kirillov" <max@max630.net>
Subject: [PATCH] http-backend: Treat empty CONTENT_LENGTH as zero
Date: Mon, 10 Sep 2018 23:53:59 +0300
Message-ID: <20180910205359.32332-1-max@max630.net> (raw)
In-Reply-To: <20180910052558.GB55941@aiede.svl.corp.google.com>

From: Jeff King <peff@peff.net>
Subject: [PATCH] http-backend: Treat empty CONTENT_LENGTH as zero

There is no known case where empty body it used by a server as
instruction to read until EOF, so there is no need to violate the RFC.
Make get_content_length() return 0 in this case.

Currently there is no practical difference, as the GET request
where it can be empty is handled without actual reading the body
(in get_info_refs() function), but it is better to stick to the correct
behavior.

Signed-off-by: Max Kirillov <max@max630.net>
---
The incremental. Hopefully I described the reason right. Needs "signed-off-by"
 http-backend.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/http-backend.c b/http-backend.c
index 458642ef72..ea36a52118 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -353,8 +353,28 @@ static ssize_t get_content_length(void)
 	ssize_t val = -1;
 	const char *str = getenv("CONTENT_LENGTH");
 
-	if (str && *str && !git_parse_ssize_t(str, &val))
-		die("failed to parse CONTENT_LENGTH: %s", str);
+	if (!str) {
+		/*
+		 * RFC3875 says this must mean "no body", but in practice we
+		 * receive chunked encodings with no CONTENT_LENGTH. Tell the
+		 * caller to read until EOF.
+		 */
+		val = -1;
+	} else if (!*str) {
+		/*
+		 * An empty length should be treated as "no body" according to
+		 * RFC3875, and this seems to hold in practice.
+		 */
+		val = 0;
+	} else {
+		/*
+		 * We have a non-empty CONTENT_LENGTH; trust what's in it as long
+		 * as it can be parsed.
+		 */
+		if (!git_parse_ssize_t(str, &val))
+			die("failed to parse CONTENT_LENGTH: '%s'", str);
+	}
+
 	return val;
 }
 
-- 
2.17.0.1185.g782057d875


  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-06  6:10 CONTENT_LENGTH can no longer be empty Jonathan Nieder
2018-09-06 19:35 ` [PATCH] http-backend: allow empty CONTENT_LENGTH Max Kirillov
2018-09-06 21:54   ` Junio C Hamano
2018-09-07  3:27     ` Max Kirillov
2018-09-07  3:38       ` Jeff King
2018-09-07  4:20         ` Max Kirillov
2018-09-07  4:59         ` Max Kirillov
2018-09-07  9:49           ` Junio C Hamano
2018-09-08  5:41             ` Max Kirillov
2018-09-09  4:40             ` Max Kirillov
2018-09-06 22:45   ` Jonathan Nieder
2018-09-07  3:36   ` [PATCH v2] " Max Kirillov
2018-09-09  4:10     ` [PATCH v4] " Max Kirillov
2018-09-10  5:25       ` Jonathan Nieder
2018-09-10 13:17         ` Jeff King
2018-09-10 16:37           ` Junio C Hamano
2018-09-10 18:46             ` Jeff King
2018-09-10 20:53         ` Max Kirillov [this message]
2018-09-10 21:22           ` [PATCH] http-backend: Treat empty CONTENT_LENGTH as zero Jonathan Nieder
2018-09-11  1:55             ` Jeff King
2018-09-11  2:20               ` Jonathan Nieder
2018-09-11  2:30                 ` Jeff King
2018-09-11  1:58           ` Jeff King
2018-09-11  3:42           ` [PATCH] http-backend: treat " Jonathan Nieder
2018-09-11  4:03             ` Jonathan Nieder
2018-09-11 18:15               ` Junio C Hamano
2018-09-11 18:27                 ` Junio C Hamano
2018-09-12  5:56                 ` Jeff King
2018-09-12  6:26                   ` Jonathan Nieder
2018-09-12 16:10                   ` Junio C Hamano
2018-09-11  4:18             ` Junio C Hamano
2018-09-11  4:29               ` Jonathan Nieder
2018-09-08  0:19 [PATCH v2] http-backend: allow empty CONTENT_LENGTH Jonathan Nieder
2018-09-08  5:35 ` Max Kirillov
2018-09-08  5:42 ` [PATCH v3] " Max Kirillov
2018-09-10  5:17   ` Jonathan Nieder
2018-09-10 20:36     ` Max Kirillov
2018-09-11  4:06 Jonathan Nieder
2018-09-11 20:33 ` [PATCH v2] http-backend test: make empty CONTENT_LENGTH test more realistic Max Kirillov

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