Address deprecated curl APIs (#4245)

This fixes the `linux-musl` and `osx-gcc` jobs which
[started](https://github.com/git-for-windows/git/actions/runs/3985792568/jobs/6833602370)
to
[fail](https://github.com/git-for-windows/git/actions/runs/3985792568/jobs/6833601563).

Author: dscho

INSTALL

@@ -139,7 +139,7 @@ Issues of note:
 	  not need that functionality, use NO_CURL to build without
 	  it.
 
-	  Git requires version "7.19.4" or later of "libcurl" to build
+	  Git requires version "7.19.5" or later of "libcurl" to build
 	  without NO_CURL. This version requirement may be bumped in
 	  the future.
 

git-curl-compat.h

@@ -127,6 +127,14 @@
 #endif
 
 /**
+ * CURLOPT_PROTOCOLS_STR and CURLOPT_REDIR_PROTOCOLS_STR were added in 7.85.0,
+ * released in August 2022.
+ */
+#if LIBCURL_VERSION_NUM >= 0x075500
+#define GIT_CURL_HAVE_CURLOPT_PROTOCOLS_STR 1
+#endif
+
+/*
  * CURLSSLOPT_AUTO_CLIENT_CERT was added in 7.77.0, released in May
  * 2021.
  */

http-push.c

@@ -198,13 +198,13 @@ static void curl_setup_http(CURL *curl, const char *url,
 		const char *custom_req, struct buffer *buffer,
 		curl_write_callback write_fn)
 {
-	curl_easy_setopt(curl, CURLOPT_PUT, 1);
+	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 	curl_easy_setopt(curl, CURLOPT_URL, url);
 	curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 	curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
-	curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
-	curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
+	curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION, seek_buffer);
+	curl_easy_setopt(curl, CURLOPT_SEEKDATA, buffer);
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 	curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 	curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);

http.c

@@ -165,21 +165,19 @@ size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 	return size / eltsize;
 }
 
-curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
+int seek_buffer(void *clientp, curl_off_t offset, int origin)
 {
 	struct buffer *buffer = clientp;
 
-	switch (cmd) {
-	case CURLIOCMD_NOP:
-		return CURLIOE_OK;
-
-	case CURLIOCMD_RESTARTREAD:
-		buffer->posn = 0;
-		return CURLIOE_OK;
-
-	default:
-		return CURLIOE_UNKNOWNCMD;
+	if (origin != SEEK_SET)
+		BUG("seek_buffer only handles SEEK_SET");
+	if (offset < 0 || offset >= buffer->buf.len) {
+		error("curl seek would be outside of buffer");
+		return CURL_SEEKFUNC_FAIL;
 	}
+
+	buffer->posn = offset;
+	return CURL_SEEKFUNC_OK;
 }
 
 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
@@ -791,20 +789,37 @@ void setup_curl_trace(CURL *handle)
 	curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 }
 
-static long get_curl_allowed_protocols(int from_user)
+static void proto_list_append(struct strbuf *list, const char *proto)
 {
-	long allowed_protocols = 0;
+	if (!list)
+		return;
+	if (list->len)
+		strbuf_addch(list, ',');
+	strbuf_addstr(list, proto);
+}
 
-	if (is_transport_allowed("http", from_user))
-		allowed_protocols |= CURLPROTO_HTTP;
-	if (is_transport_allowed("https", from_user))
-		allowed_protocols |= CURLPROTO_HTTPS;
-	if (is_transport_allowed("ftp", from_user))
-		allowed_protocols |= CURLPROTO_FTP;
-	if (is_transport_allowed("ftps", from_user))
-		allowed_protocols |= CURLPROTO_FTPS;
+static long get_curl_allowed_protocols(int from_user, struct strbuf *list)
+{
+	long bits = 0;
 
-	return allowed_protocols;
+	if (is_transport_allowed("http", from_user)) {
+		bits |= CURLPROTO_HTTP;
+		proto_list_append(list, "http");
+	}
+	if (is_transport_allowed("https", from_user)) {
+		bits |= CURLPROTO_HTTPS;
+		proto_list_append(list, "https");
+	}
+	if (is_transport_allowed("ftp", from_user)) {
+		bits |= CURLPROTO_FTP;
+		proto_list_append(list, "ftp");
+	}
+	if (is_transport_allowed("ftps", from_user)) {
+		bits |= CURLPROTO_FTPS;
+		proto_list_append(list, "ftps");
+	}
+
+	return bits;
 }
 
 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
@@ -959,10 +974,26 @@ static CURL *get_curl_handle(void)
 
 	curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 	curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
+
+#ifdef GIT_CURL_HAVE_CURLOPT_PROTOCOLS_STR
+	{
+		struct strbuf buf = STRBUF_INIT;
+
+		get_curl_allowed_protocols(0, &buf);
+		curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS_STR, buf.buf);
+		strbuf_reset(&buf);
+
+		get_curl_allowed_protocols(-1, &buf);
+		curl_easy_setopt(result, CURLOPT_PROTOCOLS_STR, buf.buf);
+		strbuf_release(&buf);
+	}
+#else
 	curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
-			 get_curl_allowed_protocols(0));
+			 get_curl_allowed_protocols(0, NULL));
 	curl_easy_setopt(result, CURLOPT_PROTOCOLS,
-			 get_curl_allowed_protocols(-1));
+			 get_curl_allowed_protocols(-1, NULL));
+#endif
+
 	if (getenv("GIT_CURL_VERBOSE"))
 		http_trace_curl_no_data();
 	setup_curl_trace(result);

http.h

@@ -40,7 +40,7 @@ struct buffer {
 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
-curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
+int seek_buffer(void *clientp, curl_off_t offset, int origin);
 
 /* Slot lifecycle functions */
 struct active_request_slot *get_active_slot(void);

remote-curl.c

@@ -717,25 +717,23 @@ static size_t rpc_out(void *ptr, size_t eltsize,
 	return avail;
 }
 
-static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
+static int rpc_seek(void *clientp, curl_off_t offset, int origin)
 {
 	struct rpc_state *rpc = clientp;
 
-	switch (cmd) {
-	case CURLIOCMD_NOP:
-		return CURLIOE_OK;
+	if (origin != SEEK_SET)
+		BUG("rpc_seek only handles SEEK_SET, not %d", origin);
 
-	case CURLIOCMD_RESTARTREAD:
-		if (rpc->initial_buffer) {
-			rpc->pos = 0;
-			return CURLIOE_OK;
+	if (rpc->initial_buffer) {
+		if (offset < 0 || offset > rpc->len) {
+			error("curl seek would be outside of rpc buffer");
+			return CURL_SEEKFUNC_FAIL;
 		}
-		error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
-		return CURLIOE_FAILRESTART;
-
-	default:
-		return CURLIOE_UNKNOWNCMD;
+		rpc->pos = offset;
+		return CURL_SEEKFUNC_OK;
 	}
+	error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
+	return CURL_SEEKFUNC_FAIL;
 }
 
 struct check_pktline_state {
@@ -959,8 +957,8 @@ static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_rece
 		rpc->initial_buffer = 1;
 		curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 		curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
-		curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
-		curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
+		curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
+		curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
 		if (options.verbosity > 1) {
 			fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 			fflush(stderr);