winhttp.c 26.9 KB
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/*
Edward Thomson committed
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */

#ifdef GIT_WINHTTP

#include "git2.h"
#include "git2/transport.h"
#include "buffer.h"
#include "posix.h"
#include "netops.h"
#include "smart.h"
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#include "remote.h"
#include "repository.h"
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#include <winhttp.h>
#pragma comment(lib, "winhttp")

Russell Belfer committed
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#include <strsafe.h>

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/* For UuidCreate */
#pragma comment(lib, "rpcrt4")

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#define WIDEN2(s) L ## s
#define WIDEN(s) WIDEN2(s)

#define MAX_CONTENT_TYPE_LEN	100
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#define WINHTTP_OPTION_PEERDIST_EXTENSION_STATE	109
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#define CACHED_POST_BODY_BUF_SIZE	4096
#define UUID_LENGTH_CCH	32

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static const char *prefix_http = "http://";
static const char *prefix_https = "https://";
static const char *upload_pack_service = "upload-pack";
static const char *upload_pack_ls_service_url = "/info/refs?service=git-upload-pack";
static const char *upload_pack_service_url = "/git-upload-pack";
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static const char *receive_pack_service = "receive-pack";
static const char *receive_pack_ls_service_url = "/info/refs?service=git-receive-pack";
static const char *receive_pack_service_url = "/git-receive-pack";
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static const wchar_t *get_verb = L"GET";
static const wchar_t *post_verb = L"POST";
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static const wchar_t *pragma_nocache = L"Pragma: no-cache";
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static const wchar_t *transfer_encoding = L"Transfer-Encoding: chunked";
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static const int no_check_cert_flags = SECURITY_FLAG_IGNORE_CERT_CN_INVALID |
	SECURITY_FLAG_IGNORE_CERT_DATE_INVALID |
	SECURITY_FLAG_IGNORE_UNKNOWN_CA;

#define OWNING_SUBTRANSPORT(s) ((winhttp_subtransport *)(s)->parent.subtransport)

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typedef enum {
	GIT_WINHTTP_AUTH_BASIC = 1,
} winhttp_authmechanism_t;

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typedef struct {
	git_smart_subtransport_stream parent;
	const char *service;
	const char *service_url;
	const wchar_t *verb;
	HINTERNET request;
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	wchar_t *request_uri;
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	char *chunk_buffer;
	unsigned chunk_buffer_len;
	HANDLE post_body;
	DWORD post_body_len;
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	unsigned sent_request : 1,
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		received_response : 1,
		chunked : 1;
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} winhttp_stream;

typedef struct {
	git_smart_subtransport parent;
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	transport_smart *owner;
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	const char *path;
	char *host;
	char *port;
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	char *user_from_url;
	char *pass_from_url;
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	git_cred *cred;
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	git_cred *url_cred;
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	int auth_mechanism;
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	HINTERNET session;
	HINTERNET connection;
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	unsigned use_ssl : 1;
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} winhttp_subtransport;

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static int apply_basic_credential(HINTERNET request, git_cred *cred)
{
	git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *)cred;
	git_buf buf = GIT_BUF_INIT, raw = GIT_BUF_INIT;
	wchar_t *wide = NULL;
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	int error = -1, wide_len = 0;
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	git_buf_printf(&raw, "%s:%s", c->username, c->password);

	if (git_buf_oom(&raw) ||
		git_buf_puts(&buf, "Authorization: Basic ") < 0 ||
		git_buf_put_base64(&buf, git_buf_cstr(&raw), raw.size) < 0)
		goto on_error;

	wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf),	-1, NULL, 0);

	if (!wide_len) {
		giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
		goto on_error;
	}

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	wide = git__malloc(wide_len * sizeof(wchar_t));
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	if (!wide)
		goto on_error;

	if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf), -1, wide, wide_len)) {
		giterr_set(GITERR_OS, "Failed to convert string to wide form");
		goto on_error;
	}

	if (!WinHttpAddRequestHeaders(request, wide, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
		giterr_set(GITERR_OS, "Failed to add a header to the request");
		goto on_error;
	}

	error = 0;

on_error:
	/* We were dealing with plaintext passwords, so clean up after ourselves a bit. */
	if (wide)
		memset(wide, 0x0, wide_len * sizeof(wchar_t));

	if (buf.size)
		memset(buf.ptr, 0x0, buf.size);

	if (raw.size)
		memset(raw.ptr, 0x0, raw.size);

	git__free(wide);
	git_buf_free(&buf);
	git_buf_free(&raw);
	return error;
}

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static int winhttp_stream_connect(winhttp_stream *s)
{
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	git_buf buf = GIT_BUF_INIT;
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	char *proxy_url = NULL;
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	wchar_t ct[MAX_CONTENT_TYPE_LEN];
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	wchar_t *types[] = { L"*/*", NULL };
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	BOOL peerdist = FALSE;
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	int error = -1, wide_len;
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	/* Prepare URL */
	git_buf_printf(&buf, "%s%s", t->path, s->service_url);

	if (git_buf_oom(&buf))
		return -1;

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	/* Convert URL to wide characters */
	wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf),	-1, NULL, 0);

	if (!wide_len) {
		giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
		goto on_error;
	}

	s->request_uri = git__malloc(wide_len * sizeof(wchar_t));

	if (!s->request_uri)
		goto on_error;

	if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf), -1, s->request_uri, wide_len)) {
		giterr_set(GITERR_OS, "Failed to convert string to wide form");
		goto on_error;
	}
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	/* Establish request */
	s->request = WinHttpOpenRequest(
			t->connection,
			s->verb,
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			s->request_uri,
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			NULL,
			WINHTTP_NO_REFERER,
			types,
			t->use_ssl ? WINHTTP_FLAG_SECURE : 0);

	if (!s->request) {
		giterr_set(GITERR_OS, "Failed to open request");
		goto on_error;
	}

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	/* Set proxy if necessary */
	if (git_remote__get_http_proxy(t->owner->owner, t->use_ssl, &proxy_url) < 0)
		goto on_error;

	if (proxy_url) {
		WINHTTP_PROXY_INFO proxy_info;
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		wchar_t *proxy_wide;

		/* Convert URL to wide characters */
		wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
			proxy_url, -1, NULL, 0);
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		if (!wide_len) {
			giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
			goto on_error;
		}
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		proxy_wide = git__malloc(wide_len * sizeof(wchar_t));

		if (!proxy_wide)
			goto on_error;

		if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
			proxy_url, -1, proxy_wide, wide_len)) {
			giterr_set(GITERR_OS, "Failed to convert string to wide form");
			git__free(proxy_wide);
			goto on_error;
		}
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		/* Strip any trailing forward slash on the proxy URL;
		 * WinHTTP doesn't like it if one is present */
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		if (wide_len > 1 && L'/' == proxy_wide[wide_len - 2])
			proxy_wide[wide_len - 2] = L'\0';
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		proxy_info.dwAccessType = WINHTTP_ACCESS_TYPE_NAMED_PROXY;
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		proxy_info.lpszProxy = proxy_wide;
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		proxy_info.lpszProxyBypass = NULL;

		if (!WinHttpSetOption(s->request,
			WINHTTP_OPTION_PROXY,
			&proxy_info,
			sizeof(WINHTTP_PROXY_INFO))) {
			giterr_set(GITERR_OS, "Failed to set proxy");
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			git__free(proxy_wide);
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			goto on_error;
		}
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		git__free(proxy_wide);
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	}

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	/* Strip unwanted headers (X-P2P-PeerDist, X-P2P-PeerDistEx) that WinHTTP
	 * adds itself. This option may not be supported by the underlying
	 * platform, so we do not error-check it */
	WinHttpSetOption(s->request,
		WINHTTP_OPTION_PEERDIST_EXTENSION_STATE,
		&peerdist,
		sizeof(peerdist));

	/* Send Pragma: no-cache header */
	if (!WinHttpAddRequestHeaders(s->request, pragma_nocache, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
		giterr_set(GITERR_OS, "Failed to add a header to the request");
		goto on_error;
	}

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	/* Send Content-Type header -- only necessary on a POST */
	if (post_verb == s->verb) {
		git_buf_clear(&buf);
		if (git_buf_printf(&buf, "Content-Type: application/x-git-%s-request", s->service) < 0)
			goto on_error;

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		git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf));
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		if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
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			giterr_set(GITERR_OS, "Failed to add a header to the request");
			goto on_error;
		}
	}

	/* If requested, disable certificate validation */
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	if (t->use_ssl) {
		int flags;

		if (t->owner->parent.read_flags(&t->owner->parent, &flags) < 0)
			goto on_error;

		if ((GIT_TRANSPORTFLAGS_NO_CHECK_CERT & flags) &&
			!WinHttpSetOption(s->request, WINHTTP_OPTION_SECURITY_FLAGS,
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			(LPVOID)&no_check_cert_flags, sizeof(no_check_cert_flags))) {
			giterr_set(GITERR_OS, "Failed to set options to ignore cert errors");
			goto on_error;
		}
	}

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	/* If we have a credential on the subtransport, apply it to the request */
	if (t->cred &&
		t->cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT &&
		t->auth_mechanism == GIT_WINHTTP_AUTH_BASIC &&
		apply_basic_credential(s->request, t->cred) < 0)
		goto on_error;

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	/* If no other credentials have been applied and the URL has username and
	 * password, use those */
	if (!t->cred && t->user_from_url && t->pass_from_url) {
		if (!t->url_cred &&
			 git_cred_userpass_plaintext_new(&t->url_cred, t->user_from_url, t->pass_from_url) < 0)
			goto on_error;
		if (apply_basic_credential(s->request, t->url_cred) < 0)
			goto on_error;
	}

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	/* We've done everything up to calling WinHttpSendRequest. */

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	error = 0;
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on_error:
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	git__free(proxy_url);
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	git_buf_free(&buf);
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	return error;
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}

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static int parse_unauthorized_response(
	HINTERNET request,
	int *allowed_types,
	int *auth_mechanism)
{
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	DWORD supported, first, target;
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	*allowed_types = 0;
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	*auth_mechanism = 0;
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	/* WinHttpQueryHeaders() must be called before WinHttpQueryAuthSchemes(). 
	 * We can assume this was already done, since we know we are unauthorized. 
	 */
	if (!WinHttpQueryAuthSchemes(request, &supported, &first, &target)) {
		giterr_set(GITERR_OS, "Failed to parse supported auth schemes"); 
		return -1;
	}
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	if (WINHTTP_AUTH_SCHEME_BASIC & supported) {
		*allowed_types |= GIT_CREDTYPE_USERPASS_PLAINTEXT;
		*auth_mechanism = GIT_WINHTTP_AUTH_BASIC;
	}
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	return 0;
}

static int write_chunk(HINTERNET request, const char *buffer, size_t len)
{
	DWORD bytes_written;
	git_buf buf = GIT_BUF_INIT;

	/* Chunk header */
	git_buf_printf(&buf, "%X\r\n", len);

	if (git_buf_oom(&buf))
		return -1;

	if (!WinHttpWriteData(request,
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		git_buf_cstr(&buf),	(DWORD)git_buf_len(&buf),
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		&bytes_written)) {
		git_buf_free(&buf);
		giterr_set(GITERR_OS, "Failed to write chunk header");
		return -1;
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	}

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	git_buf_free(&buf);

	/* Chunk body */
	if (!WinHttpWriteData(request,
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		buffer, (DWORD)len,
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		&bytes_written)) {
		giterr_set(GITERR_OS, "Failed to write chunk");
		return -1;
	}

	/* Chunk footer */
	if (!WinHttpWriteData(request,
		"\r\n", 2,
		&bytes_written)) {
		giterr_set(GITERR_OS, "Failed to write chunk footer");
		return -1;
	}

	return 0;
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}

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static int winhttp_stream_read(
	git_smart_subtransport_stream *stream,
	char *buffer,
	size_t buf_size,
	size_t *bytes_read)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
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	DWORD dw_bytes_read;
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	char replay_count = 0;
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replay:
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	/* Enforce a reasonable cap on the number of replays */
	if (++replay_count >= 7) {
		giterr_set(GITERR_NET, "Too many redirects or authentication replays");
		return -1;
	}

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	/* Connect if necessary */
	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	if (!s->received_response) {
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		DWORD status_code, status_code_length, content_type_length, bytes_written;
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		char expected_content_type_8[MAX_CONTENT_TYPE_LEN];
		wchar_t expected_content_type[MAX_CONTENT_TYPE_LEN], content_type[MAX_CONTENT_TYPE_LEN];

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		if (!s->sent_request) {
			if (!WinHttpSendRequest(s->request,
				WINHTTP_NO_ADDITIONAL_HEADERS, 0,
				WINHTTP_NO_REQUEST_DATA, 0,
				s->post_body_len, 0)) {
				giterr_set(GITERR_OS, "Failed to send request");
				return -1;
			}

			s->sent_request = 1;
		}

		if (s->chunked) {
			assert(s->verb == post_verb);

			/* Flush, if necessary */
			if (s->chunk_buffer_len > 0 &&
				write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
				return -1;

			s->chunk_buffer_len = 0;

			/* Write the final chunk. */
			if (!WinHttpWriteData(s->request,
				"0\r\n\r\n", 5,
				&bytes_written)) {
				giterr_set(GITERR_OS, "Failed to write final chunk");
				return -1;
			}
		}
		else if (s->post_body) {
			char *buffer;
			DWORD len = s->post_body_len, bytes_read;

			if (INVALID_SET_FILE_POINTER == SetFilePointer(s->post_body,
					0, 0, FILE_BEGIN) &&
				NO_ERROR != GetLastError()) {
				giterr_set(GITERR_OS, "Failed to reset file pointer");
				return -1;
			}

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			buffer = git__malloc(CACHED_POST_BODY_BUF_SIZE);
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			while (len > 0) {
				DWORD bytes_written;

				if (!ReadFile(s->post_body, buffer,
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					min(CACHED_POST_BODY_BUF_SIZE, len),
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					&bytes_read, NULL) ||
					!bytes_read) {
					git__free(buffer);
					giterr_set(GITERR_OS, "Failed to read from temp file");
					return -1;
				}

				if (!WinHttpWriteData(s->request, buffer,
					bytes_read, &bytes_written)) {
					git__free(buffer);
					giterr_set(GITERR_OS, "Failed to write data");
					return -1;
				}

				len -= bytes_read;
				assert(bytes_read == bytes_written);
			}

			git__free(buffer);

			/* Eagerly close the temp file */
			CloseHandle(s->post_body);
			s->post_body = NULL;
		}

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		if (!WinHttpReceiveResponse(s->request, 0)) {
			giterr_set(GITERR_OS, "Failed to receive response");
			return -1;
		}

		/* Verify that we got a 200 back */
		status_code_length = sizeof(status_code);

		if (!WinHttpQueryHeaders(s->request,
			WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
			WINHTTP_HEADER_NAME_BY_INDEX,
			&status_code, &status_code_length,
			WINHTTP_NO_HEADER_INDEX)) {
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				giterr_set(GITERR_OS, "Failed to retrieve status code");
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				return -1;
		}

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		/* The implementation of WinHTTP prior to Windows 7 will not
		 * redirect to an identical URI. Some Git hosters use self-redirects
		 * as part of their DoS mitigation strategy. Check first to see if we
		 * have a redirect status code, and that we haven't already streamed
		 * a post body. (We can't replay a streamed POST.) */
		if (!s->chunked &&
			(HTTP_STATUS_MOVED == status_code ||
			 HTTP_STATUS_REDIRECT == status_code ||
			 (HTTP_STATUS_REDIRECT_METHOD == status_code &&
			  get_verb == s->verb) ||
			 HTTP_STATUS_REDIRECT_KEEP_VERB == status_code)) {

			/* Check for Windows 7. This workaround is only necessary on
			 * Windows Vista and earlier. Windows 7 is version 6.1. */
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			if (!git_has_win32_version(6, 1, 0)) {
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				wchar_t *location;
				DWORD location_length;
				int redirect_cmp;

				/* OK, fetch the Location header from the redirect. */
				if (WinHttpQueryHeaders(s->request,
					WINHTTP_QUERY_LOCATION,
					WINHTTP_HEADER_NAME_BY_INDEX,
					WINHTTP_NO_OUTPUT_BUFFER,
					&location_length,
					WINHTTP_NO_HEADER_INDEX) ||
					GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
					giterr_set(GITERR_OS, "Failed to read Location header");
					return -1;
				}

				location = git__malloc(location_length);
				GITERR_CHECK_ALLOC(location);

				if (!WinHttpQueryHeaders(s->request,
					WINHTTP_QUERY_LOCATION,
					WINHTTP_HEADER_NAME_BY_INDEX,
					location,
					&location_length,
					WINHTTP_NO_HEADER_INDEX)) {
					giterr_set(GITERR_OS, "Failed to read Location header");
					git__free(location);
					return -1;
				}

				/* Compare the Location header with the request URI */
				redirect_cmp = wcscmp(location, s->request_uri);
				git__free(location);

				if (!redirect_cmp) {
					/* Replay the request */
					WinHttpCloseHandle(s->request);
					s->request = NULL;
					s->sent_request = 0;

					goto replay;
				}
			}
		}

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		/* Handle authentication failures */
		if (HTTP_STATUS_DENIED == status_code &&
			get_verb == s->verb && t->owner->cred_acquire_cb) {
			int allowed_types;

			if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanism) < 0)
				return -1;

			if (allowed_types &&
				(!t->cred || 0 == (t->cred->credtype & allowed_types))) {

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				if (t->owner->cred_acquire_cb(&t->cred, t->owner->url, t->user_from_url, allowed_types, t->owner->cred_acquire_payload) < 0)
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					return -1;

				assert(t->cred);

				WinHttpCloseHandle(s->request);
				s->request = NULL;
				s->sent_request = 0;

				/* Successfully acquired a credential */
				goto replay;
			}
		}

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		if (HTTP_STATUS_OK != status_code) {
			giterr_set(GITERR_NET, "Request failed with status code: %d", status_code);
			return -1;
		}

		/* Verify that we got the correct content-type back */
		if (post_verb == s->verb)
			snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-result", s->service);
		else
			snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-advertisement", s->service);

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		git__utf8_to_16(expected_content_type, MAX_CONTENT_TYPE_LEN, expected_content_type_8);
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		content_type_length = sizeof(content_type);

		if (!WinHttpQueryHeaders(s->request,
			WINHTTP_QUERY_CONTENT_TYPE,
			WINHTTP_HEADER_NAME_BY_INDEX,
			&content_type, &content_type_length,
			WINHTTP_NO_HEADER_INDEX)) {
				giterr_set(GITERR_OS, "Failed to retrieve response content-type");
				return -1;
		}

		if (wcscmp(expected_content_type, content_type)) {
			giterr_set(GITERR_NET, "Received unexpected content-type");
			return -1;
		}

		s->received_response = 1;
	}

	if (!WinHttpReadData(s->request,
		(LPVOID)buffer,
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		(DWORD)buf_size,
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		&dw_bytes_read))
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	{
		giterr_set(GITERR_OS, "Failed to read data");
		return -1;
	}

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	*bytes_read = dw_bytes_read;

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	return 0;
}

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static int winhttp_stream_write_single(
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	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	DWORD bytes_written;

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

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	/* This implementation of write permits only a single call. */
	if (s->sent_request) {
		giterr_set(GITERR_NET, "Subtransport configured for only one write");
		return -1;
	}

	if (!WinHttpSendRequest(s->request,
649 650 651 652 653 654 655 656 657 658 659 660 661
			WINHTTP_NO_ADDITIONAL_HEADERS, 0,
			WINHTTP_NO_REQUEST_DATA, 0,
			(DWORD)len, 0)) {
		giterr_set(GITERR_OS, "Failed to send request");
		return -1;
	}

	s->sent_request = 1;

	if (!WinHttpWriteData(s->request,
			(LPCVOID)buffer,
			(DWORD)len,
			&bytes_written)) {
662 663 664 665 666 667 668 669 670
		giterr_set(GITERR_OS, "Failed to write data");
		return -1;
	}

	assert((DWORD)len == bytes_written);

	return 0;
}

671
static int put_uuid_string(LPWSTR buffer, size_t buffer_len_cch)
672 673 674
{
	UUID uuid;
	RPC_STATUS status = UuidCreate(&uuid);
675
	HRESULT result;
676 677 678 679 680 681 682 683

	if (RPC_S_OK != status &&
		RPC_S_UUID_LOCAL_ONLY != status &&
		RPC_S_UUID_NO_ADDRESS != status) {
		giterr_set(GITERR_NET, "Unable to generate name for temp file");
		return -1;
	}

684 685
	if (buffer_len_cch < UUID_LENGTH_CCH + 1) {
		giterr_set(GITERR_NET, "Buffer too small for name of temp file");
686 687 688
		return -1;
	}

689 690 691
	result = StringCbPrintfW(
		buffer, buffer_len_cch,
		L"%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x",
692 693 694 695
		uuid.Data1, uuid.Data2, uuid.Data3,
		uuid.Data4[0], uuid.Data4[1], uuid.Data4[2], uuid.Data4[3],
		uuid.Data4[4], uuid.Data4[5], uuid.Data4[6], uuid.Data4[7]);

696
	if (FAILED(result)) {
697 698 699 700 701 702 703 704 705
		giterr_set(GITERR_OS, "Unable to generate name for temp file");
		return -1;
	}

	return 0;
}

static int get_temp_file(LPWSTR buffer, DWORD buffer_len_cch)
{
706
	size_t len;
707 708 709 710 711 712 713 714

	if (!GetTempPathW(buffer_len_cch, buffer)) {
		giterr_set(GITERR_OS, "Failed to get temp path");
		return -1;
	}

	len = wcslen(buffer);

715
	if (buffer[len - 1] != '\\' && len < buffer_len_cch)
716 717
		buffer[len++] = '\\';

718
	if (put_uuid_string(&buffer[len], (size_t)buffer_len_cch - len) < 0)
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
		return -1;

	return 0;
}

static int winhttp_stream_write_buffered(
	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	DWORD bytes_written;

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	/* Buffer the payload, using a temporary file so we delegate
	 * memory management of the data to the operating system. */
	if (!s->post_body) {
		wchar_t temp_path[MAX_PATH + 1];

		if (get_temp_file(temp_path, MAX_PATH + 1) < 0)
			return -1;

		s->post_body = CreateFileW(temp_path,
			GENERIC_READ | GENERIC_WRITE,
			FILE_SHARE_DELETE, NULL,
			CREATE_NEW,
			FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE | FILE_FLAG_SEQUENTIAL_SCAN,
			NULL);

		if (INVALID_HANDLE_VALUE == s->post_body) {
			s->post_body = NULL;
			giterr_set(GITERR_OS, "Failed to create temporary file");
			return -1;
		}
	}

758
	if (!WriteFile(s->post_body, buffer, (DWORD)len, &bytes_written, NULL)) {
759
		giterr_set(GITERR_OS, "Failed to write to temporary file");
760 761 762 763 764
		return -1;
	}

	assert((DWORD)len == bytes_written);

765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
	s->post_body_len += bytes_written;

	return 0;
}

static int winhttp_stream_write_chunked(
	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	if (!s->sent_request) {
		/* Send Transfer-Encoding: chunked header */
		if (!WinHttpAddRequestHeaders(s->request,
			transfer_encoding, (ULONG) -1L,
			WINHTTP_ADDREQ_FLAG_ADD)) {
			giterr_set(GITERR_OS, "Failed to add a header to the request");
			return -1;
		}

		if (!WinHttpSendRequest(s->request,
			WINHTTP_NO_ADDITIONAL_HEADERS, 0,
			WINHTTP_NO_REQUEST_DATA, 0,
			WINHTTP_IGNORE_REQUEST_TOTAL_LENGTH, 0)) {
			giterr_set(GITERR_OS, "Failed to send request");
			return -1;
		}

		s->sent_request = 1;
	}

	if (len > CACHED_POST_BODY_BUF_SIZE) {
		/* Flush, if necessary */
		if (s->chunk_buffer_len > 0) {
			if (write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
				return -1;

			s->chunk_buffer_len = 0;
		}

		/* Write chunk directly */
		if (write_chunk(s->request, buffer, len) < 0)
			return -1;
	}
	else {
		/* Append as much to the buffer as we can */
816
		int count = min(CACHED_POST_BODY_BUF_SIZE - s->chunk_buffer_len, (int)len);
817 818

		if (!s->chunk_buffer)
819
			s->chunk_buffer = git__malloc(CACHED_POST_BODY_BUF_SIZE);
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835

		memcpy(s->chunk_buffer + s->chunk_buffer_len, buffer, count);
		s->chunk_buffer_len += count;
		buffer += count;
		len -= count;

		/* Is the buffer full? If so, then flush */
		if (CACHED_POST_BODY_BUF_SIZE == s->chunk_buffer_len) {
			if (write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
				return -1;

			s->chunk_buffer_len = 0;

			/* Is there any remaining data from the source? */
			if (len > 0) {
				memcpy(s->chunk_buffer, buffer, len);
836
				s->chunk_buffer_len = (unsigned int)len;
837 838 839 840
			}
		}
	}

841 842 843 844 845 846 847
	return 0;
}

static void winhttp_stream_free(git_smart_subtransport_stream *stream)
{
	winhttp_stream *s = (winhttp_stream *)stream;

848 849 850 851 852 853 854 855 856 857
	if (s->chunk_buffer) {
		git__free(s->chunk_buffer);
		s->chunk_buffer = NULL;
	}

	if (s->post_body) {
		CloseHandle(s->post_body);
		s->post_body = NULL;
	}

858 859 860 861 862
	if (s->request_uri) {
		git__free(s->request_uri);
		s->request_uri = NULL;
	}

863 864 865 866 867 868 869 870
	if (s->request) {
		WinHttpCloseHandle(s->request);
		s->request = NULL;
	}

	git__free(s);
}

871
static int winhttp_stream_alloc(winhttp_subtransport *t, winhttp_stream **stream)
872 873 874 875 876 877
{
	winhttp_stream *s;

	if (!stream)
		return -1;

878
	s = git__calloc(sizeof(winhttp_stream), 1);
879 880 881 882
	GITERR_CHECK_ALLOC(s);

	s->parent.subtransport = &t->parent;
	s->parent.read = winhttp_stream_read;
883
	s->parent.write = winhttp_stream_write_single;
884 885
	s->parent.free = winhttp_stream_free;

886 887
	*stream = s;

888 889 890 891 892 893 894 895
	return 0;
}

static int winhttp_connect(
	winhttp_subtransport *t,
	const char *url)
{
	wchar_t *ua = L"git/1.0 (libgit2 " WIDEN(LIBGIT2_VERSION) L")";
896
	git_win32_path host;
897
	int32_t port;
898
	const char *default_port = "80";
899 900 901 902 903 904 905 906 907 908 909 910 911
	int ret;

	if (!git__prefixcmp(url, prefix_http)) {
		url = url + strlen(prefix_http);
		default_port = "80";
	}

	if (!git__prefixcmp(url, prefix_https)) {
		url += strlen(prefix_https);
		default_port = "443";
		t->use_ssl = 1;
	}

912 913
	if ((ret = gitno_extract_url_parts(&t->host, &t->port, &t->user_from_url,
					&t->pass_from_url, url, default_port)) < 0)
914 915 916 917 918 919 920 921 922
		return ret;

	t->path = strchr(url, '/');

	/* Prepare port */
	if (git__strtol32(&port, t->port, NULL, 10) < 0)
		return -1;

	/* Prepare host */
923
	git_win32_path_from_c(host, t->host);
924 925 926 927 928 929 930 931 932 933 934 935 936

	/* Establish session */
	t->session = WinHttpOpen(
			ua,
			WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
			WINHTTP_NO_PROXY_NAME,
			WINHTTP_NO_PROXY_BYPASS,
			0);

	if (!t->session) {
		giterr_set(GITERR_OS, "Failed to init WinHTTP");
		return -1;
	}
937

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	/* Establish connection */
	t->connection = WinHttpConnect(
			t->session,
			host,
			port,
			0);

	if (!t->connection) {
		giterr_set(GITERR_OS, "Failed to connect to host");
		return -1;
	}

	return 0;
}

static int winhttp_uploadpack_ls(
	winhttp_subtransport *t,
955
	winhttp_stream *s)
956 957 958 959 960 961 962 963 964 965
{
	s->service = upload_pack_service;
	s->service_url = upload_pack_ls_service_url;
	s->verb = get_verb;

	return 0;
}

static int winhttp_uploadpack(
	winhttp_subtransport *t,
966
	winhttp_stream *s)
967
{
968 969 970
	s->service = upload_pack_service;
	s->service_url = upload_pack_service_url;
	s->verb = post_verb;
971

972 973
	return 0;
}
974

975 976 977 978 979 980 981
static int winhttp_receivepack_ls(
	winhttp_subtransport *t,
	winhttp_stream *s)
{
	s->service = receive_pack_service;
	s->service_url = receive_pack_ls_service_url;
	s->verb = get_verb;
982

983 984
	return 0;
}
985

986 987 988 989 990 991
static int winhttp_receivepack(
	winhttp_subtransport *t,
	winhttp_stream *s)
{
	/* WinHTTP only supports Transfer-Encoding: chunked
	 * on Windows Vista (NT 6.0) and higher. */
992
	s->chunked = git_has_win32_version(6, 0, 0);
993 994 995 996 997 998 999 1000

	if (s->chunked)
		s->parent.write = winhttp_stream_write_chunked;
	else
		s->parent.write = winhttp_stream_write_buffered;

	s->service = receive_pack_service;
	s->service_url = receive_pack_service_url;
1001 1002 1003 1004 1005 1006 1007
	s->verb = post_verb;

	return 0;
}

static int winhttp_action(
	git_smart_subtransport_stream **stream,
1008
	git_smart_subtransport *subtransport,
1009 1010 1011
	const char *url,
	git_smart_service_t action)
{
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;
	winhttp_stream *s;
	int ret = -1;

	if (!t->connection &&
		winhttp_connect(t, url) < 0)
		return -1;

	if (winhttp_stream_alloc(t, &s) < 0)
		return -1;
1022 1023 1024 1025 1026 1027 1028

	if (!stream)
		return -1;

	switch (action)
	{
		case GIT_SERVICE_UPLOADPACK_LS:
1029 1030
			ret = winhttp_uploadpack_ls(t, s);
			break;
1031 1032

		case GIT_SERVICE_UPLOADPACK:
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
			ret = winhttp_uploadpack(t, s);
			break;

		case GIT_SERVICE_RECEIVEPACK_LS:
			ret = winhttp_receivepack_ls(t, s);
			break;

		case GIT_SERVICE_RECEIVEPACK:
			ret = winhttp_receivepack(t, s);
			break;

		default:
			assert(0);
1046 1047
	}

1048 1049 1050 1051
	if (!ret)
		*stream = &s->parent;

	return ret;
1052 1053
}

1054
static int winhttp_close(git_smart_subtransport *subtransport)
1055
{
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;
	int ret = 0;

	if (t->host) {
		git__free(t->host);
		t->host = NULL;
	}

	if (t->port) {
		git__free(t->port);
		t->port = NULL;
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
	}

	if (t->user_from_url) {
		git__free(t->user_from_url);
		t->user_from_url = NULL;
	}

	if (t->pass_from_url) {
		git__free(t->pass_from_url);
		t->pass_from_url = NULL;
1077
	}
1078

1079 1080 1081 1082 1083
	if (t->cred) {
		t->cred->free(t->cred);
		t->cred = NULL;
	}

1084 1085 1086 1087 1088
	if (t->url_cred) {
		t->url_cred->free(t->url_cred);
		t->url_cred = NULL;
	}

1089
	if (t->connection) {
1090 1091 1092 1093 1094
		if (!WinHttpCloseHandle(t->connection)) {
			giterr_set(GITERR_OS, "Unable to close connection");
			ret = -1;
		}

1095 1096 1097 1098
		t->connection = NULL;
	}

	if (t->session) {
1099 1100 1101 1102 1103
		if (!WinHttpCloseHandle(t->session)) {
			giterr_set(GITERR_OS, "Unable to close session");
			ret = -1;
		}

1104 1105 1106
		t->session = NULL;
	}

1107 1108 1109 1110 1111 1112 1113 1114 1115
	return ret;
}

static void winhttp_free(git_smart_subtransport *subtransport)
{
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;

	winhttp_close(subtransport);

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
	git__free(t);
}

int git_smart_subtransport_http(git_smart_subtransport **out, git_transport *owner)
{
	winhttp_subtransport *t;

	if (!out)
		return -1;

1126
	t = git__calloc(sizeof(winhttp_subtransport), 1);
1127 1128
	GITERR_CHECK_ALLOC(t);

1129
	t->owner = (transport_smart *)owner;
1130
	t->parent.action = winhttp_action;
1131
	t->parent.close = winhttp_close;
1132 1133 1134 1135 1136 1137 1138
	t->parent.free = winhttp_free;

	*out = (git_smart_subtransport *) t;
	return 0;
}

#endif /* GIT_WINHTTP */