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http-backend: respect CONTENT_LENGTH for receive-pack

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Push passes to another commands, as described in
https://public-inbox.org/git/20171129032214.GB32345@sigill.intra.peff.net/

As it gets complicated to correctly track the data length, instead transfer
the data through parent process and cut the pipe as the specified length is
reached. Do it only when CONTENT_LENGTH is set, otherwise pass the input
directly to the forked commands.

Add tests for cases:

* CONTENT_LENGTH is set, script's stdin has more data, with all combinations
  of variations: fetch or push, plain or compressed body, correct or truncated
  input.

* CONTENT_LENGTH is specified to a value which does not fit into ssize_t.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Max Kirillov <max@max630.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Max Kirillov
2018-07-27 06:48:59 +03:00
committed by Junio C Hamano
parent c79edf73f4
commit 6c213e863a
4 changed files with 223 additions and 2 deletions
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32
http-backend.c
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@ -373,6 +373,8 @@ static void inflate_request(const char *prog_name, int out, int buffer_input, ss
unsigned char in_buf[8192];
unsigned char out_buf[8192];
unsigned long cnt = 0;
int req_len_defined = req_len >= 0;
size_t req_remaining_len = req_len;
memset(&stream, 0, sizeof(stream));
git_inflate_init_gzip_only(&stream);
@ -387,8 +389,15 @@ static void inflate_request(const char *prog_name, int out, int buffer_input, ss
n = read_request(0, &full_request, req_len);
stream.next_in = full_request;
} else {
n = xread(0, in_buf, sizeof(in_buf));
ssize_t buffer_len;
if (req_len_defined && req_remaining_len <= sizeof(in_buf))
buffer_len = req_remaining_len;
else
buffer_len = sizeof(in_buf);
n = xread(0, in_buf, buffer_len);
stream.next_in = in_buf;
if (req_len_defined && n > 0)
req_remaining_len -= n;
}
if (n <= 0)
@ -431,6 +440,23 @@ static void copy_request(const char *prog_name, int out, ssize_t req_len)
free(buf);
}
static void pipe_fixed_length(const char *prog_name, int out, size_t req_len)
{
unsigned char buf[8192];
size_t remaining_len = req_len;
while (remaining_len > 0) {
size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len;
ssize_t n = xread(0, buf, chunk_length);
if (n < 0)
die_errno("Reading request failed");
write_to_child(out, buf, n, prog_name);
remaining_len -= n;
}
close(out);
}
static void run_service(const char **argv, int buffer_input)
{
const char *encoding = getenv("HTTP_CONTENT_ENCODING");
@ -457,7 +483,7 @@ static void run_service(const char **argv, int buffer_input)
"GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
cld.argv = argv;
if (buffer_input || gzipped_request)
if (buffer_input || gzipped_request || req_len >= 0)
cld.in = -1;
cld.git_cmd = 1;
if (start_command(&cld))
@ -468,6 +494,8 @@ static void run_service(const char **argv, int buffer_input)
inflate_request(argv[0], cld.in, buffer_input, req_len);
else if (buffer_input)
copy_request(argv[0], cld.in, req_len);
else if (req_len >= 0)
pipe_fixed_length(argv[0], cld.in, req_len);
else
close(0);