Merge pull request libgit2#5741 from libgit2/ethomson/ipv6

Handle ipv6 addresses

Author: ethomson

src/net.c

@@ -335,7 +335,7 @@ bool git_net_url_valid(git_net_url *url)
 	return (url->host && url->port && url->path);
 }
 
-int git_net_url_is_default_port(git_net_url *url)
+bool git_net_url_is_default_port(git_net_url *url)
 {
 	const char *default_port;
 
@@ -345,6 +345,11 @@ int git_net_url_is_default_port(git_net_url *url)
 		return false;
 }
 
+bool git_net_url_is_ipv6(git_net_url *url)
+{
+	return (strchr(url->host, ':') != NULL);
+}
+
 void git_net_url_swap(git_net_url *a, git_net_url *b)
 {
 	git_net_url tmp = GIT_NET_URL_INIT;

src/net.h

@@ -33,8 +33,11 @@ extern int git_net_url_joinpath(
 /** Ensures that a URL is minimally valid (contains a host, port and path) */
 extern bool git_net_url_valid(git_net_url *url);
 
-/** Returns nonzero if the URL is on the default port. */
-extern int git_net_url_is_default_port(git_net_url *url);
+/** Returns true if the URL is on the default port. */
+extern bool git_net_url_is_default_port(git_net_url *url);
+
+/** Returns true if the host portion of the URL is an ipv6 address. */
+extern bool git_net_url_is_ipv6(git_net_url *url);
 
 /* Applies a redirect to the URL with a git-aware service suffix. */
 extern int git_net_url_apply_redirect(

src/transports/httpclient.c

@@ -631,6 +631,26 @@ GIT_INLINE(int) apply_proxy_credentials(
 	                         request->proxy_credentials);
 }
 
+static int puts_host_and_port(git_buf *buf, git_net_url *url, bool force_port)
+{
+	bool ipv6 = git_net_url_is_ipv6(url);
+
+	if (ipv6)
+		git_buf_putc(buf, '[');
+
+	git_buf_puts(buf, url->host);
+
+	if (ipv6)
+		git_buf_putc(buf, ']');
+
+	if (force_port || !git_net_url_is_default_port(url)) {
+		git_buf_putc(buf, ':');
+		git_buf_puts(buf, url->port);
+	}
+
+	return git_buf_oom(buf) ? -1 : 0;
+}
+
 static int generate_connect_request(
 	git_http_client *client,
 	git_http_request *request)
@@ -641,14 +661,17 @@ static int generate_connect_request(
 	git_buf_clear(&client->request_msg);
 	buf = &client->request_msg;
 
-	git_buf_printf(buf, "CONNECT %s:%s HTTP/1.1\r\n",
-	               client->server.url.host, client->server.url.port);
+	git_buf_puts(buf, "CONNECT ");
+	puts_host_and_port(buf, &client->server.url, true);
+	git_buf_puts(buf, " HTTP/1.1\r\n");
 
 	git_buf_puts(buf, "User-Agent: ");
 	git_http__user_agent(buf);
 	git_buf_puts(buf, "\r\n");
 
-	git_buf_printf(buf, "Host: %s\r\n", client->proxy.url.host);
+	git_buf_puts(buf, "Host: ");
+	puts_host_and_port(buf, &client->proxy.url, false);
+	git_buf_puts(buf, "\r\n");
 
 	if ((error = apply_proxy_credentials(buf, client, request) < 0))
 		return -1;
@@ -687,11 +710,8 @@ static int generate_request(
 	git_http__user_agent(buf);
 	git_buf_puts(buf, "\r\n");
 
-	git_buf_printf(buf, "Host: %s", request->url->host);
-
-	if (!git_net_url_is_default_port(request->url))
-		git_buf_printf(buf, ":%s", request->url->port);
-
+	git_buf_puts(buf, "Host: ");
+	puts_host_and_port(buf, request->url, false);
 	git_buf_puts(buf, "\r\n");
 
 	if (request->accept)
@@ -902,7 +922,7 @@ static int proxy_connect(
 	int error;
 
 	if (!client->proxy_connected || !client->keepalive) {
-		git_trace(GIT_TRACE_DEBUG, "Connecting to proxy %s:%s",
+		git_trace(GIT_TRACE_DEBUG, "Connecting to proxy %s port %s",
 			  client->proxy.url.host, client->proxy.url.port);
 
 		if ((error = server_create_stream(&client->proxy)) < 0 ||
@@ -1023,7 +1043,7 @@ static int http_client_connect(
 			goto on_error;
 	}
 
-	git_trace(GIT_TRACE_DEBUG, "Connecting to remote %s:%s",
+	git_trace(GIT_TRACE_DEBUG, "Connecting to remote %s port %s",
 	          client->server.url.host, client->server.url.port);
 
 	if ((error = server_connect(client)) < 0)

src/transports/winhttp.c

@@ -451,8 +451,14 @@ static int winhttp_stream_connect(winhttp_stream *s)
 		git_buf_puts(&processed_url, t->proxy.url.scheme);
 		git_buf_PUTS(&processed_url, "://");
 
+		if (git_net_url_is_ipv6(&t->proxy.url))
+			git_buf_putc(&processed_url, '[');
+
 		git_buf_puts(&processed_url, t->proxy.url.host);
 
+		if (git_net_url_is_ipv6(&t->proxy.url))
+			git_buf_putc(&processed_url, ']');
+
 		if (!git_net_url_is_default_port(&t->proxy.url))
 			git_buf_printf(&processed_url, ":%s", t->proxy.url.port);
 
@@ -736,10 +742,11 @@ static void CALLBACK winhttp_status(
 static int winhttp_connect(
 	winhttp_subtransport *t)
 {
-	wchar_t *wide_host;
+	wchar_t *wide_host = NULL;
 	int32_t port;
-	wchar_t *wide_ua;
-	git_buf ua = GIT_BUF_INIT;
+	wchar_t *wide_ua = NULL;
+	git_buf ipv6 = GIT_BUF_INIT, ua = GIT_BUF_INIT;
+	const char *host;
 	int error = -1;
 	int default_timeout = TIMEOUT_INFINITE;
 	int default_connect_timeout = DEFAULT_CONNECT_TIMEOUT;
@@ -755,29 +762,33 @@ static int winhttp_connect(
 	/* Prepare port */
 	if (git__strntol32(&port, t->server.url.port,
 			   strlen(t->server.url.port), NULL, 10) < 0)
-		return -1;
+		goto on_error;
+
+	/* IPv6? Add braces around the host. */
+	if (git_net_url_is_ipv6(&t->server.url)) {
+		if (git_buf_printf(&ipv6, "[%s]", t->server.url.host) < 0)
+			goto on_error;
+
+		host = ipv6.ptr;
+	} else {
+		host = t->server.url.host;
+	}
 
 	/* Prepare host */
-	if (git__utf8_to_16_alloc(&wide_host, t->server.url.host) < 0) {
+	if (git__utf8_to_16_alloc(&wide_host, host) < 0) {
 		git_error_set(GIT_ERROR_OS, "unable to convert host to wide characters");
-		return -1;
+		goto on_error;
 	}
 
 
-	if ((error = git_http__user_agent(&ua)) < 0) {
-		git__free(wide_host);
-		return error;
-	}
+	if (git_http__user_agent(&ua) < 0)
+		goto on_error;
 
 	if (git__utf8_to_16_alloc(&wide_ua, git_buf_cstr(&ua)) < 0) {
 		git_error_set(GIT_ERROR_OS, "unable to convert host to wide characters");
-		git__free(wide_host);
-		git_buf_dispose(&ua);
-		return -1;
+		goto on_error;
 	}
 
-	git_buf_dispose(&ua);
-
 	/* Establish session */
 	t->session = WinHttpOpen(
 		wide_ua,
@@ -836,6 +847,7 @@ static int winhttp_connect(
 	if (error < 0)
 		winhttp_close_connection(t);
 
+	git_buf_dispose(&ipv6);
 	git__free(wide_host);
 	git__free(wide_ua);