git-imap-send: use libcurl for implementationbr/imap-send-via-libcurl

Use libcurl's high-level API functions to implement git-imap-send
instead of the previous low-level OpenSSL-based functions.

Since version 7.30.0, libcurl's API has been able to communicate with
IMAP servers. Using those high-level functions instead of the current
ones would reduce imap-send.c by some 1200 lines of code. For now,
the old ones are wrapped in #ifdefs, and the new functions are enabled
by make if curl's version is >= 7.34.0, from which version on curl's
CURLOPT_LOGIN_OPTIONS (enabling IMAP authentication) parameter has been
available. The low-level functions will still be used for tunneling
into the server for now.

As I don't have access to that many IMAP servers, I haven't been able to
test the new code with a wide variety of parameter combinations. I did
test both secure and insecure (imaps:// and imap://) connections and
values of "PLAIN" and "LOGIN" for the authMethod.

In order to suppress a sparse warning about "using sizeof on a
function", we use the same solution used in commit 9371322a6
("sparse: suppress some "using sizeof on a function" warnings",
06-10-2013) which solved exactly this problem for the other commands
using libcurl.

Helped-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Bernhard Reiter <ockham@raz.or.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 154 insertions, 26 deletions

diff --git a/imap-send.c b/imap-send.c
index 7f9d30effd..4dfe4c25d7 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -30,13 +30,18 @@
 #ifdef NO_OPENSSL
 typedef void *SSL;
 #endif
+#ifdef USE_CURL_FOR_IMAP_SEND
+#include "http.h"
+#endif
 
 static int verbosity;
+static int use_curl; /* strictly opt in */
 
-static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] < <mbox>", NULL };
+static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
 
 static struct option imap_send_options[] = {
 	OPT__VERBOSITY(&verbosity),
+	OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
 	OPT_END()
 };
 
@@ -1344,14 +1349,145 @@ static void git_imap_config(void)
 	git_config_get_string("imap.authmethod", &server.auth_method);
 }
 
-int main(int argc, char **argv)
+static int append_msgs_to_imap(struct imap_server_conf *server,
+			       struct strbuf* all_msgs, int total)
 {
-	struct strbuf all_msgs = STRBUF_INIT;
 	struct strbuf msg = STRBUF_INIT;
 	struct imap_store *ctx = NULL;
 	int ofs = 0;
 	int r;
-	int total, n = 0;
+	int n = 0;
+
+	ctx = imap_open_store(server, server->folder);
+	if (!ctx) {
+		fprintf(stderr, "failed to open store\n");
+		return 1;
+	}
+	ctx->name = server->folder;
+
+	fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
+	while (1) {
+		unsigned percent = n * 100 / total;
+
+		fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
+
+		if (!split_msg(all_msgs, &msg, &ofs))
+			break;
+		if (server->use_html)
+			wrap_in_html(&msg);
+		r = imap_store_msg(ctx, &msg);
+		if (r != DRV_OK)
+			break;
+		n++;
+	}
+	fprintf(stderr, "\n");
+
+	imap_close_store(ctx);
+
+	return 0;
+}
+
+#ifdef USE_CURL_FOR_IMAP_SEND
+static CURL *setup_curl(struct imap_server_conf *srvc)
+{
+	CURL *curl;
+	struct strbuf path = STRBUF_INIT;
+
+	if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
+		die("curl_global_init failed");
+
+	curl = curl_easy_init();
+
+	if (!curl)
+		die("curl_easy_init failed");
+
+	curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
+	curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
+
+	strbuf_addstr(&path, server.host);
+	if (!path.len || path.buf[path.len - 1] != '/')
+		strbuf_addch(&path, '/');
+	strbuf_addstr(&path, server.folder);
+
+	curl_easy_setopt(curl, CURLOPT_URL, path.buf);
+	strbuf_release(&path);
+	curl_easy_setopt(curl, CURLOPT_PORT, server.port);
+
+	if (server.auth_method) {
+		struct strbuf auth = STRBUF_INIT;
+		strbuf_addstr(&auth, "AUTH=");
+		strbuf_addstr(&auth, server.auth_method);
+		curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
+		strbuf_release(&auth);
+	}
+
+	if (server.use_ssl)
+		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
+
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
+
+	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
+
+	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+	if (0 < verbosity)
+		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+
+	return curl;
+}
+
+static int curl_append_msgs_to_imap(struct imap_server_conf *server,
+				    struct strbuf* all_msgs, int total) {
+	int ofs = 0;
+	int n = 0;
+	struct buffer msgbuf = { STRBUF_INIT, 0 };
+	CURL *curl;
+	CURLcode res = CURLE_OK;
+
+	curl = setup_curl(server);
+	curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
+
+	fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
+	while (1) {
+		unsigned percent = n * 100 / total;
+		int prev_len;
+
+		fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
+
+		prev_len = msgbuf.buf.len;
+		if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
+			break;
+		if (server->use_html)
+			wrap_in_html(&msgbuf.buf);
+		lf_to_crlf(&msgbuf.buf);
+
+		curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
+				 (curl_off_t)(msgbuf.buf.len-prev_len));
+
+		res = curl_easy_perform(curl);
+
+		if(res != CURLE_OK) {
+			fprintf(stderr, "curl_easy_perform() failed: %s\n",
+					curl_easy_strerror(res));
+			break;
+		}
+
+		n++;
+	}
+	fprintf(stderr, "\n");
+
+	curl_easy_cleanup(curl);
+	curl_global_cleanup();
+
+	return 0;
+}
+#endif
+
+int main(int argc, char **argv)
+{
+	struct strbuf all_msgs = STRBUF_INIT;
+	int total;
 	int nongit_ok;
 
 	git_extract_argv0_path(argv[0]);
@@ -1366,6 +1502,13 @@ int main(int argc, char **argv)
 	if (argc)
 		usage_with_options(imap_send_usage, imap_send_options);
 
+#ifndef USE_CURL_FOR_IMAP_SEND
+	if (use_curl) {
+		warning("--use-curl not supported in this build");
+		use_curl = 0;
+	}
+#endif
+
 	if (!server.port)
 		server.port = server.use_ssl ? 993 : 143;
 
@@ -1399,29 +1542,14 @@ int main(int argc, char **argv)
 	}
 
 	/* write it to the imap server */
-	ctx = imap_open_store(&server, server.folder);
-	if (!ctx) {
-		fprintf(stderr, "failed to open store\n");
-		return 1;
-	}
-
-	fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
-	while (1) {
-		unsigned percent = n * 100 / total;
 
-		fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
-		if (!split_msg(&all_msgs, &msg, &ofs))
-			break;
-		if (server.use_html)
-			wrap_in_html(&msg);
-		r = imap_store_msg(ctx, &msg);
-		if (r != DRV_OK)
-			break;
-		n++;
-	}
-	fprintf(stderr, "\n");
+	if (server.tunnel)
+		return append_msgs_to_imap(&server, &all_msgs, total);
 
-	imap_close_store(ctx);
+#ifdef USE_CURL_FOR_IMAP_SEND
+	if (use_curl)
+		return curl_append_msgs_to_imap(&server, &all_msgs, total);
+#endif
 
-	return 0;
+	return append_msgs_to_imap(&server, &all_msgs, total);
 }