src/transports/git.c - third_party/libgit2 - Git at Google

 /*
  * Copyright (C) 2009-2012 the libgit2 contributors
  *
  * This file is part of libgit2, distributed under the GNU GPL v2 with
  * a Linking Exception. For full terms see the included COPYING file.
  */

 #include "git2/net.h"
 #include "git2/common.h"
 #include "git2/types.h"
 #include "git2/errors.h"
 #include "git2/net.h"
 #include "git2/revwalk.h"

 #include "vector.h"
 #include "transport.h"
 #include "pkt.h"
 #include "common.h"
 #include "netops.h"
 #include "filebuf.h"
 #include "repository.h"
 #include "fetch.h"
 #include "protocol.h"

 typedef struct {
 	git_transport parent;
 	git_protocol proto;
 	GIT_SOCKET socket;
 	git_vector refs;
 	git_remote_head **heads;
 	git_transport_caps caps;
 	char buff[1024];
 	gitno_buffer buf;
 #ifdef GIT_WIN32
 	WSADATA wsd;
 #endif
 } transport_git;

 /*
  * Create a git procol request.
  *
  * For example: 0035git-upload-pack /libgit2/libgit2\0host=github.com\0
  */
 static int gen_proto(git_buf *request, const char *cmd, const char *url)
 {
 	char *delim, *repo;
 	char default_command[] = "git-upload-pack";
 	char host[] = "host=";
 	size_t len;

 	delim = strchr(url, '/');
 	if (delim == NULL) {
 		giterr_set(GITERR_NET, "Malformed URL");
 		return -1;
 	}

 	repo = delim;

 	delim = strchr(url, ':');
 	if (delim == NULL)
 		delim = strchr(url, '/');

 	if (cmd == NULL)
 		cmd = default_command;

 	len = 4 + strlen(cmd) + 1 + strlen(repo) + 1 + strlen(host) + (delim - url) + 1;

 	git_buf_grow(request, len);
 	git_buf_printf(request, "%04x%s %s%c%s",
 		(unsigned int)(len & 0x0FFFF), cmd, repo, 0, host);
 	git_buf_put(request, url, delim - url);
 	git_buf_putc(request, '\0');

 	if (git_buf_oom(request))
 		return GIT_ENOMEM;

 	return 0;
 }

 static int send_request(GIT_SOCKET s, const char *cmd, const char *url)
 {
 	int error;
 	git_buf request = GIT_BUF_INIT;

 	error = gen_proto(&request, cmd, url);
 	if (error < 0)
 		goto cleanup;

 	error = gitno_send(s, request.ptr, request.size, 0);

 cleanup:
 	git_buf_free(&request);
 	return error;
 }

 /*
  * Parse the URL and connect to a server, storing the socket in
  * out. For convenience this also takes care of asking for the remote
  * refs
  */
 static int do_connect(transport_git *t, const char *url)
 {
 	GIT_SOCKET s;
 	char *host, *port;
 	const char prefix[] = "git://";
 	int error, connected = 0;

 	if (!git__prefixcmp(url, prefix))
 		url += strlen(prefix);

 	if (gitno_extract_host_and_port(&host, &port, url, GIT_DEFAULT_PORT) < 0)
 		return -1;

 	s = gitno_connect(host, port);
 	connected = 1;
 	error = send_request(s, NULL, url);
 	t->socket = s;

 	git__free(host);
 	git__free(port);

 	if (error < GIT_SUCCESS && s > 0)
 		gitno_close(s);
 	if (!connected) {
 		giterr_set(GITERR_NET, "Failed to connect to the host");
 		return -1;
 	}

 	return error;
 }

 /*
  * Read from the socket and store the references in the vector
  */
 static int store_refs(transport_git *t)
 {
 	gitno_buffer *buf = &t->buf;
 	int ret = 0;

 	while (1) {
 		if ((ret = gitno_recv(buf)) < 0)
 			return -1;
 		if (ret == 0) /* Orderly shutdown, so exit */
 			return 0;

 		ret = git_protocol_store_refs(&t->proto, buf->data, buf->offset);
 		if (ret == GIT_ESHORTBUFFER) {
 			gitno_consume_n(buf, buf->len);
 			continue;
 		}

 		if (ret < 0)
 			return ret;

 		gitno_consume_n(buf, buf->offset);

 		if (t->proto.flush) { /* No more refs */
 			t->proto.flush = 0;
 			return 0;
 		}
 	}
 }

 static int detect_caps(transport_git *t)
 {
 	git_vector *refs = &t->refs;
 	git_pkt_ref *pkt;
 	git_transport_caps *caps = &t->caps;
 	const char *ptr;

 	pkt = git_vector_get(refs, 0);
 	/* No refs or capabilites, odd but not a problem */
 	if (pkt == NULL || pkt->capabilities == NULL)
 		return 0;

 	ptr = pkt->capabilities;
 	while (ptr != NULL && *ptr != '\0') {
 		if (*ptr == ' ')
 			ptr++;

 		if(!git__prefixcmp(ptr, GIT_CAP_OFS_DELTA)) {
 			caps->common = caps->ofs_delta = 1;
 			ptr += strlen(GIT_CAP_OFS_DELTA);
 			continue;
 		}

 		/* We don't know this capability, so skip it */
 		ptr = strchr(ptr, ' ');
 	}

 	return 0;
 }

 /*
  * Since this is a network connection, we need to parse and store the
  * pkt-lines at this stage and keep them there.
  */
 static int git_connect(git_transport *transport, int direction)
 {
 	transport_git *t = (transport_git *) transport;

 	if (direction == GIT_DIR_PUSH) {
 		giterr_set(GITERR_NET, "Pushing over git:// is not supported");
 		return -1;
 	}

 	t->parent.direction = direction;
 	if (git_vector_init(&t->refs, 16, NULL) < 0)
 		return -1;

 	/* Connect and ask for the refs */
 	if (do_connect(t, transport->url) < 0)
 		goto cleanup;

 	gitno_buffer_setup(&t->buf, t->buff, sizeof(t->buff), t->socket);

 	t->parent.connected = 1;
 	if (store_refs(t) < 0)
 		goto cleanup;

 	if (detect_caps(t) < 0)
 		goto cleanup;

 	return 0;
 cleanup:
 	git_vector_free(&t->refs);
 	return -1;
 }

 static int git_ls(git_transport *transport, git_headlist_cb list_cb, void *opaque)
 {
 	transport_git *t = (transport_git *) transport;
 	git_vector *refs = &t->refs;
 	unsigned int i;
 	git_pkt *p = NULL;

 	git_vector_foreach(refs, i, p) {
 		git_pkt_ref *pkt = NULL;

 		if (p->type != GIT_PKT_REF)
 			continue;

 		pkt = (git_pkt_ref *)p;

 		if (list_cb(&pkt->head, opaque) < 0) {
 			giterr_set(GITERR_NET, "User callback returned error");
 			return -1;
 		}
 	}

 	return 0;
 }

 /* Wait until we get an ack from the */
 static int recv_pkt(gitno_buffer *buf)
 {
 	const char *ptr = buf->data, *line_end;
 	git_pkt *pkt;
 	int pkt_type, error;

 	do {
 		/* Wait for max. 1 second */
 		if ((error = gitno_select_in(buf, 1, 0)) < 0) {
 			return -1;
 		} else if (error == 0) {
 			/*
 			 * Some servers don't respond immediately, so if this
 			 * happens, we keep sending information until it
 			 * answers. Pretend we received a NAK to convince higher
 			 * layers to do so.
 			 */
 			return GIT_PKT_NAK;
 		}

 		if ((error = gitno_recv(buf)) < 0)
 			return -1;

 		error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->offset);
 		if (error == GIT_ESHORTBUFFER)
 			continue;
 		if (error < 0)
 			return -1;
 	} while (error);

 	gitno_consume(buf, line_end);
 	pkt_type = pkt->type;
 	git__free(pkt);

 	return pkt_type;
 }

 static int git_negotiate_fetch(git_transport *transport, git_repository *repo, const git_vector *wants)
 {
 	transport_git *t = (transport_git *) transport;
 	git_revwalk *walk;
 	git_oid oid;
 	int error;
 	unsigned int i;
 	git_buf data = GIT_BUF_INIT;
 	gitno_buffer *buf = &t->buf;

 	if (git_pkt_buffer_wants(wants, &t->caps, &data) < 0)
 		return -1;

 	if (git_fetch_setup_walk(&walk, repo) < 0)
 		goto on_error;

 	if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
 		goto on_error;

 	git_buf_clear(&data);
 	/*
 	 * We don't support any kind of ACK extensions, so the negotiation
 	 * boils down to sending what we have and listening for an ACK
 	 * every once in a while.
 	 */
 	i = 0;
 	while ((error = git_revwalk_next(&oid, walk)) == 0) {
 		git_pkt_buffer_have(&oid, &data);
 		i++;
 		if (i % 20 == 0) {
 			int pkt_type;

 			git_pkt_buffer_flush(&data);
 			if (git_buf_oom(&data))
 				goto on_error;

 			if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
 				goto on_error;

 			pkt_type = recv_pkt(buf);

 			if (pkt_type == GIT_PKT_ACK) {
 				break;
 			} else if (pkt_type == GIT_PKT_NAK) {
 				continue;
 			} else {
 				giterr_set(GITERR_NET, "Unexpected pkt type");
 				goto on_error;
 			}

 		}
 	}
 	if (error < 0 && error != GIT_EREVWALKOVER)
 		goto on_error;

 	/* Tell the other end that we're done negotiating */
 	git_buf_clear(&data);
 	git_pkt_buffer_flush(&data);
 	git_pkt_buffer_done(&data);
 	if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
 		goto on_error;

 	git_buf_free(&data);
 	git_revwalk_free(walk);
 	return 0;

 on_error:
 	git_buf_free(&data);
 	git_revwalk_free(walk);
 	return -1;
 }

 static int git_download_pack(git_transport *transport, git_repository *repo, git_off_t *bytes, git_indexer_stats *stats)
 {
 	transport_git *t = (transport_git *) transport;
 	int error = 0, read_bytes;
 	gitno_buffer *buf = &t->buf;
 	git_pkt *pkt;
 	const char *line_end, *ptr;

 	/*
 	 * For now, we ignore everything and wait for the pack
 	 */
 	do {
 		ptr = buf->data;
 		/* Whilst we're searching for the pack */
 		while (1) {
 			if (buf->offset == 0) {
 				break;
 			}

 			error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->offset);
 			if (error == GIT_ESHORTBUFFER)
 				break;

 			if (error < GIT_SUCCESS)
 				return error;

 			if (pkt->type == GIT_PKT_PACK) {
 				git__free(pkt);
 				return git_fetch__download_pack(buf->data, buf->offset, t->socket, repo, bytes, stats);
 			}

 			/* For now we don't care about anything */
 			git__free(pkt);
 			gitno_consume(buf, line_end);
 		}

 		read_bytes = gitno_recv(buf);
 	} while (read_bytes);

 	return read_bytes;
 }

 static int git_close(git_transport *transport)
 {
 	transport_git *t = (transport_git*) transport;

 	/* Can't do anything if there's an error, so don't bother checking  */
 	git_pkt_send_flush(t->socket);
 	if (gitno_close(t->socket) < 0) {
 		giterr_set(GITERR_NET, "Failed to close socket");
 		return -1;
 	}

 #ifdef GIT_WIN32
 	WSACleanup();
 #endif

 	return 0;
 }

 static void git_free(git_transport *transport)
 {
 	transport_git *t = (transport_git *) transport;
 	git_vector *refs = &t->refs;
 	unsigned int i;

 	for (i = 0; i < refs->length; ++i) {
 		git_pkt *p = git_vector_get(refs, i);
 		git_pkt_free(p);
 	}

 	git_vector_free(refs);
 	git__free(t->heads);
 	git_buf_free(&t->proto.buf);
 	git__free(t->parent.url);
 	git__free(t);
 }

 int git_transport_git(git_transport **out)
 {
 	transport_git *t;
 #ifdef GIT_WIN32
 	int ret;
 #endif

 	t = git__malloc(sizeof(transport_git));
 	GITERR_CHECK_ALLOC(t);

 	memset(t, 0x0, sizeof(transport_git));

 	t->parent.connect = git_connect;
 	t->parent.ls = git_ls;
 	t->parent.negotiate_fetch = git_negotiate_fetch;
 	t->parent.download_pack = git_download_pack;
 	t->parent.close = git_close;
 	t->parent.free = git_free;
 	t->proto.refs = &t->refs;
 	t->proto.transport = (git_transport *) t;

 	*out = (git_transport *) t;

 #ifdef GIT_WIN32
 	ret = WSAStartup(MAKEWORD(2,2), &t->wsd);
 	if (ret != 0) {
 		git_free(*out);
 		giterr_set(GITERR_NET, "Winsock init failed");
 		return -1;
 	}
 #endif

 	return 0;
 }
	/*
	* Copyright (C) 2009-2012 the libgit2 contributors
	*
	* This file is part of libgit2, distributed under the GNU GPL v2 with
	* a Linking Exception. For full terms see the included COPYING file.
	*/

	#include "git2/net.h"
	#include "git2/common.h"
	#include "git2/types.h"
	#include "git2/errors.h"
	#include "git2/net.h"
	#include "git2/revwalk.h"

	#include "vector.h"
	#include "transport.h"
	#include "pkt.h"
	#include "common.h"
	#include "netops.h"
	#include "filebuf.h"
	#include "repository.h"
	#include "fetch.h"
	#include "protocol.h"

	typedef struct {
	git_transport parent;
	git_protocol proto;
	GIT_SOCKET socket;
	git_vector refs;
	git_remote_head **heads;
	git_transport_caps caps;
	char buff[1024];
	gitno_buffer buf;
	#ifdef GIT_WIN32
	WSADATA wsd;
	#endif
	} transport_git;

	/*
	* Create a git procol request.
	*
	* For example: 0035git-upload-pack /libgit2/libgit2\0host=github.com\0
	*/
	static int gen_proto(git_buf request, const char cmd, const char *url)
	{
	char delim, repo;
	char default_command[] = "git-upload-pack";
	char host[] = "host=";
	size_t len;

	delim = strchr(url, '/');
	if (delim == NULL) {
	giterr_set(GITERR_NET, "Malformed URL");
	return -1;
	}

	repo = delim;

	delim = strchr(url, ':');
	if (delim == NULL)
	delim = strchr(url, '/');

	if (cmd == NULL)
	cmd = default_command;

	len = 4 + strlen(cmd) + 1 + strlen(repo) + 1 + strlen(host) + (delim - url) + 1;

	git_buf_grow(request, len);
	git_buf_printf(request, "%04x%s %s%c%s",
	(unsigned int)(len & 0x0FFFF), cmd, repo, 0, host);
	git_buf_put(request, url, delim - url);
	git_buf_putc(request, '\0');

	if (git_buf_oom(request))
	return GIT_ENOMEM;

	return 0;
	}

	static int send_request(GIT_SOCKET s, const char cmd, const char url)
	{
	int error;
	git_buf request = GIT_BUF_INIT;

	error = gen_proto(&request, cmd, url);
	if (error < 0)
	goto cleanup;

	error = gitno_send(s, request.ptr, request.size, 0);

	cleanup:
	git_buf_free(&request);
	return error;
	}

	/*
	* Parse the URL and connect to a server, storing the socket in
	* out. For convenience this also takes care of asking for the remote
	* refs
	*/
	static int do_connect(transport_git t, const char url)
	{
	GIT_SOCKET s;
	char host, port;
	const char prefix[] = "git://";
	int error, connected = 0;

	if (!git__prefixcmp(url, prefix))
	url += strlen(prefix);

	if (gitno_extract_host_and_port(&host, &port, url, GIT_DEFAULT_PORT) < 0)
	return -1;

	s = gitno_connect(host, port);
	connected = 1;
	error = send_request(s, NULL, url);
	t->socket = s;

	git__free(host);
	git__free(port);

	if (error < GIT_SUCCESS && s > 0)
	gitno_close(s);
	if (!connected) {
	giterr_set(GITERR_NET, "Failed to connect to the host");
	return -1;
	}

	return error;
	}

	/*
	* Read from the socket and store the references in the vector
	*/
	static int store_refs(transport_git *t)
	{
	gitno_buffer *buf = &t->buf;
	int ret = 0;

	while (1) {
	if ((ret = gitno_recv(buf)) < 0)
	return -1;
	if (ret == 0) /* Orderly shutdown, so exit */
	return 0;

	ret = git_protocol_store_refs(&t->proto, buf->data, buf->offset);
	if (ret == GIT_ESHORTBUFFER) {
	gitno_consume_n(buf, buf->len);
	continue;
	}

	if (ret < 0)
	return ret;

	gitno_consume_n(buf, buf->offset);

	if (t->proto.flush) { /* No more refs */
	t->proto.flush = 0;
	return 0;
	}
	}
	}

	static int detect_caps(transport_git *t)
	{
	git_vector *refs = &t->refs;
	git_pkt_ref *pkt;
	git_transport_caps *caps = &t->caps;
	const char *ptr;

	pkt = git_vector_get(refs, 0);
	/* No refs or capabilites, odd but not a problem */
	if (pkt == NULL \|\| pkt->capabilities == NULL)
	return 0;

	ptr = pkt->capabilities;
	while (ptr != NULL && *ptr != '\0') {
	if (*ptr == ' ')
	ptr++;

	if(!git__prefixcmp(ptr, GIT_CAP_OFS_DELTA)) {
	caps->common = caps->ofs_delta = 1;
	ptr += strlen(GIT_CAP_OFS_DELTA);
	continue;
	}

	/* We don't know this capability, so skip it */
	ptr = strchr(ptr, ' ');
	}

	return 0;
	}

	/*
	* Since this is a network connection, we need to parse and store the
	* pkt-lines at this stage and keep them there.
	*/
	static int git_connect(git_transport *transport, int direction)
	{
	transport_git t = (transport_git ) transport;

	if (direction == GIT_DIR_PUSH) {
	giterr_set(GITERR_NET, "Pushing over git:// is not supported");
	return -1;
	}

	t->parent.direction = direction;
	if (git_vector_init(&t->refs, 16, NULL) < 0)
	return -1;

	/* Connect and ask for the refs */
	if (do_connect(t, transport->url) < 0)
	goto cleanup;

	gitno_buffer_setup(&t->buf, t->buff, sizeof(t->buff), t->socket);

	t->parent.connected = 1;
	if (store_refs(t) < 0)
	goto cleanup;

	if (detect_caps(t) < 0)
	goto cleanup;

	return 0;
	cleanup:
	git_vector_free(&t->refs);
	return -1;
	}

	static int git_ls(git_transport transport, git_headlist_cb list_cb, void opaque)
	{
	transport_git t = (transport_git ) transport;
	git_vector *refs = &t->refs;
	unsigned int i;
	git_pkt *p = NULL;

	git_vector_foreach(refs, i, p) {
	git_pkt_ref *pkt = NULL;

	if (p->type != GIT_PKT_REF)
	continue;

	pkt = (git_pkt_ref *)p;

	if (list_cb(&pkt->head, opaque) < 0) {
	giterr_set(GITERR_NET, "User callback returned error");
	return -1;
	}
	}

	return 0;
	}

	/* Wait until we get an ack from the */
	static int recv_pkt(gitno_buffer *buf)
	{
	const char ptr = buf->data, line_end;
	git_pkt *pkt;
	int pkt_type, error;

	do {
	/* Wait for max. 1 second */
	if ((error = gitno_select_in(buf, 1, 0)) < 0) {
	return -1;
	} else if (error == 0) {
	/*
	* Some servers don't respond immediately, so if this
	* happens, we keep sending information until it
	* answers. Pretend we received a NAK to convince higher
	* layers to do so.
	*/
	return GIT_PKT_NAK;
	}

	if ((error = gitno_recv(buf)) < 0)
	return -1;

	error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->offset);
	if (error == GIT_ESHORTBUFFER)
	continue;
	if (error < 0)
	return -1;
	} while (error);

	gitno_consume(buf, line_end);
	pkt_type = pkt->type;
	git__free(pkt);

	return pkt_type;
	}

	static int git_negotiate_fetch(git_transport transport, git_repository repo, const git_vector *wants)
	{
	transport_git t = (transport_git ) transport;
	git_revwalk *walk;
	git_oid oid;
	int error;
	unsigned int i;
	git_buf data = GIT_BUF_INIT;
	gitno_buffer *buf = &t->buf;

	if (git_pkt_buffer_wants(wants, &t->caps, &data) < 0)
	return -1;

	if (git_fetch_setup_walk(&walk, repo) < 0)
	goto on_error;

	if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
	goto on_error;

	git_buf_clear(&data);
	/*
	* We don't support any kind of ACK extensions, so the negotiation
	* boils down to sending what we have and listening for an ACK
	* every once in a while.
	*/
	i = 0;
	while ((error = git_revwalk_next(&oid, walk)) == 0) {
	git_pkt_buffer_have(&oid, &data);
	i++;
	if (i % 20 == 0) {
	int pkt_type;

	git_pkt_buffer_flush(&data);
	if (git_buf_oom(&data))
	goto on_error;

	if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
	goto on_error;

	pkt_type = recv_pkt(buf);

	if (pkt_type == GIT_PKT_ACK) {
	break;
	} else if (pkt_type == GIT_PKT_NAK) {
	continue;
	} else {
	giterr_set(GITERR_NET, "Unexpected pkt type");
	goto on_error;
	}

	}
	}
	if (error < 0 && error != GIT_EREVWALKOVER)
	goto on_error;

	/* Tell the other end that we're done negotiating */
	git_buf_clear(&data);
	git_pkt_buffer_flush(&data);
	git_pkt_buffer_done(&data);
	if (gitno_send(t->socket, data.ptr, data.size, 0) < 0)
	goto on_error;

	git_buf_free(&data);
	git_revwalk_free(walk);
	return 0;

	on_error:
	git_buf_free(&data);
	git_revwalk_free(walk);
	return -1;
	}

	static int git_download_pack(git_transport transport, git_repository repo, git_off_t bytes, git_indexer_stats stats)
	{
	transport_git t = (transport_git ) transport;
	int error = 0, read_bytes;
	gitno_buffer *buf = &t->buf;
	git_pkt *pkt;
	const char line_end, ptr;

	/*
	* For now, we ignore everything and wait for the pack
	*/
	do {
	ptr = buf->data;
	/* Whilst we're searching for the pack */
	while (1) {
	if (buf->offset == 0) {
	break;
	}

	error = git_pkt_parse_line(&pkt, ptr, &line_end, buf->offset);
	if (error == GIT_ESHORTBUFFER)
	break;

	if (error < GIT_SUCCESS)
	return error;

	if (pkt->type == GIT_PKT_PACK) {
	git__free(pkt);
	return git_fetch__download_pack(buf->data, buf->offset, t->socket, repo, bytes, stats);
	}

	/* For now we don't care about anything */
	git__free(pkt);
	gitno_consume(buf, line_end);
	}

	read_bytes = gitno_recv(buf);
	} while (read_bytes);

	return read_bytes;
	}

	static int git_close(git_transport *transport)
	{
	transport_git t = (transport_git) transport;

	/* Can't do anything if there's an error, so don't bother checking */
	git_pkt_send_flush(t->socket);
	if (gitno_close(t->socket) < 0) {
	giterr_set(GITERR_NET, "Failed to close socket");
	return -1;
	}

	#ifdef GIT_WIN32
	WSACleanup();
	#endif

	return 0;
	}

	static void git_free(git_transport *transport)
	{
	transport_git t = (transport_git ) transport;
	git_vector *refs = &t->refs;
	unsigned int i;

	for (i = 0; i < refs->length; ++i) {
	git_pkt *p = git_vector_get(refs, i);
	git_pkt_free(p);
	}

	git_vector_free(refs);
	git__free(t->heads);
	git_buf_free(&t->proto.buf);
	git__free(t->parent.url);
	git__free(t);
	}

	int git_transport_git(git_transport **out)
	{
	transport_git *t;
	#ifdef GIT_WIN32
	int ret;
	#endif

	t = git__malloc(sizeof(transport_git));
	GITERR_CHECK_ALLOC(t);

	memset(t, 0x0, sizeof(transport_git));

	t->parent.connect = git_connect;
	t->parent.ls = git_ls;
	t->parent.negotiate_fetch = git_negotiate_fetch;
	t->parent.download_pack = git_download_pack;
	t->parent.close = git_close;
	t->parent.free = git_free;
	t->proto.refs = &t->refs;
	t->proto.transport = (git_transport *) t;

	out = (git_transport ) t;

	#ifdef GIT_WIN32
	ret = WSAStartup(MAKEWORD(2,2), &t->wsd);
	if (ret != 0) {
	git_free(*out);
	giterr_set(GITERR_NET, "Winsock init failed");
	return -1;
	}
	#endif

	return 0;
	}