add -J proxyjump option (#15)

doc/mscp.1.in

@@ -56,6 +56,9 @@ mscp \- copy files over multiple SSH connections
 .BI \-i \ IDENTITY\c
 ]
 [\c
+.BI \-J \ DESTINATION\c
+]
+[\c
 .BI \-c \ CIPHER\c
 ]
 [\c
@@ -270,6 +273,19 @@ supports.
 .B \-i \fIIDENTITY\fR
 Specifies the identity file for public key authentication.
 
+.TP
+.B \-J \fIDESTINATION\fR
+A shortcut to define a
+.B ProxyJump
+configuration directive. Each SFTP session of
+.B mscp
+connects to the target host by first making an
+.B ssh
+connection to the jump host described by
+.I destination.
+
+
+
 .TP
 .B \-c \fICIPHER\fR
 Selects the cipher to use for encrypting the data transfer. See

doc/mscp.rst

@@ -2,7 +2,7 @@
 MSCP
 ====
 
-:Date: v0.1.5-16-ga1ba6f1
+:Date: v0.1.5-18-ge47d5b7
 
 NAME
 ====
@@ -18,8 +18,8 @@ SYNOPSIS
 **-S** *MAX_CHUNK_SIZE* ] [ **-a** *NR_AHEAD* ] [ **-b** *BUF_SIZE* ] [
 **-L** *LIMIT_BITRATE* ] [ **-l** *LOGIN_NAME* ] [ **-P** *PORT* ] [
 **-F** *SSH_CONFIG* ] [ **-o** *SSH_OPTION* ] [ **-i** *IDENTITY* ] [
-**-c** *CIPHER* ] [ **-M** *HMAC* ] [ **-C** *COMPRESS* ] [ **-g**
-*CONGESTION* ] *source ... target*
+**-J** *DESTINATION* ] [ **-c** *CIPHER* ] [ **-M** *HMAC* ] [ **-C**
+*COMPRESS* ] [ **-g** *CONGESTION* ] *source ... target*
 
 DESCRIPTION
 ===========
@@ -159,6 +159,11 @@ OPTIONS
 **-i IDENTITY**
    Specifies the identity file for public key authentication.
 
+**-J DESTINATION**
+   A shortcut to define a **ProxyJump** configuration directive. Each
+   SFTP session of **mscp** connects to the target host by first making
+   an **ssh** connection to the jump host described by *destination.*
+
 **-c CIPHER**
    Selects the cipher to use for encrypting the data transfer. See
    `libssh features <https://www.libssh.org/features/>`__.

include/mscp.h

@@ -63,6 +63,7 @@ struct mscp_ssh_opts {
 	char	*config;	/** path to ssh_config, default ~/.ssh/config*/
 	char	**options;	/** array of ssh_config options, terminated by NULL */
 	char	*identity;	/** path to private key */
+	char	*proxyjump;	/** ProxyJump configuration directive (shortcut) */
 	char	*cipher;	/** cipher spec */
 	char	*hmac;		/** hmacp spec */
 	char	*compress;	/** yes, no, zlib@openssh.com */

scripts/test-in-container.sh

@@ -12,6 +12,9 @@ set -x
 echo "Port 22" >> /etc/ssh/sshd_config
 echo "Port 8022" >> /etc/ssh/sshd_config
 
+## Alpine default sshd disables TcpForwarding, which is required for proxyjump test
+sed -i -e 's/AllowTcpForwarding no/AllowTcpForwarding yes/' /etc/ssh/sshd_config
+
 # Run sshd
 if [ ! -e /var/run/sshd.pid ]; then
 	/usr/sbin/sshd

src/main.c

@@ -24,12 +24,12 @@ void usage(bool print_help)
 {
 	printf("mscp " MSCP_BUILD_VERSION ": copy files over multiple SSH connections\n"
 	       "\n"
-	       "Usage: mscp [-46vqDpdNh] [-n nr_conns] [-m coremask]\n"
-	       "            [-u max_startups] [-I interval] [-W checkpoint] [-R checkpoint]\n"
+	       "Usage: mscp [-46vqDpdNh] [-n nr_conns] [-m coremask] [-u max_startups]\n"
+	       "            [-I interval] [-W checkpoint] [-R checkpoint]\n"
 	       "            [-s min_chunk_sz] [-S max_chunk_sz] [-a nr_ahead]\n"
 	       "            [-b buf_sz] [-L limit_bitrate]\n"
 	       "            [-l login_name] [-P port] [-F ssh_config] [-o ssh_option]\n"
-	       "            [-i identity_file] [-c cipher_spec] [-M hmac_spec]\n"
+	       "            [-i identity_file] [-J destination] [-c cipher_spec] [-M hmac_spec]\n"
 	       "            [-C compress] [-g congestion]\n"
 	       "            source ... target\n"
 	       "\n");
@@ -64,6 +64,7 @@ void usage(bool print_help)
 	       "    -F SSH_CONFIG      path to user ssh config (default ~/.ssh/config)\n"
 	       "    -o SSH_OPTION      ssh_config option\n"
 	       "    -i IDENTITY        identity file for public key authentication\n"
+	       "    -J DESTINATION     ProxyJump destination\n"
 	       "    -c CIPHER          cipher spec\n"
 	       "    -M HMAC            hmac spec\n"
 	       "    -C COMPRESS        enable compression: "
@@ -277,7 +278,7 @@ int main(int argc, char **argv)
 	memset(&o, 0, sizeof(o));
 	o.severity = MSCP_SEVERITY_WARN;
 
-#define mscpopts "n:m:u:I:W:R:s:S:a:b:L:46vqDrl:P:i:F:o:c:M:C:g:pdNh"
+#define mscpopts "n:m:u:I:W:R:s:S:a:b:L:46vqDrl:P:F:o:i:J:c:M:C:g:pdNh"
 	while ((ch = getopt(argc, argv, mscpopts)) != -1) {
 		switch (ch) {
 		case 'n':
@@ -375,6 +376,9 @@ int main(int argc, char **argv)
 		case 'i':
 			s.identity = optarg;
 			break;
+		case 'J':
+			s.proxyjump = optarg;
+			break;
 		case 'c':
 			s.cipher = optarg;
 			break;

src/ssh.c

@@ -88,6 +88,16 @@ static int ssh_set_opts(ssh_session ssh, struct mscp_ssh_opts *opts)
 		return -1;
 	}
 
+	if (opts->proxyjump) {
+		char buf[256];
+		memset(buf, 0, sizeof(buf));
+		snprintf(buf, sizeof(buf), "proxyjump=%s", opts->proxyjump);
+		if (ssh_config_parse_string(ssh, buf) != SSH_OK) {
+			priv_set_errv("failed to set ssh option: %s", buf);
+			return -1;
+		}
+	}
+
 	if (opts->options) {
 		int n;
 		for (n = 0; opts->options[n]; n++) {

test/test_e2e.py

@@ -530,6 +530,31 @@ def test_inline_option_ng(mscp, src_prefix, dst_prefix, option):
     src.cleanup()
 
 
+@pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
+def test_porxyjump_ok(mscp, src_prefix, dst_prefix):
+    """ test -J proxyjump option"""
+    src = File("src", size = 10 * 1024 * 1024).make()
+    dst = File("dst")
+    # use small min-chunk-size to use multiple connections
+    run2ok([mscp, "-n", 4, "-s", 1024 * 1024, "-vvv",
+            "-J", "localhost:8022",
+            src_prefix + src.path, dst_prefix + dst.path])
+    assert check_same_md5sum(src, dst)
+    src.cleanup()
+    dst.cleanup()
+
+
+@pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
+def test_porxyjump_ng(mscp, src_prefix, dst_prefix):
+    """ test -J proxyjump option, invalid jump node causes fail"""
+    src = File("src", size = 10 * 1024 * 1024).make()
+    dst = File("dst")
+    # use small min-chunk-size to use multiple connections
+    run2ng([mscp, "-n", 4, "-s", 1024 * 1024, "-vvv",
+            "-J", "invaliduser@localhost:8022",
+            src_prefix + src.path, dst_prefix + dst.path])
+    src.cleanup()
+
 # username test assumes that this test runs inside a container, see Dockerfiles
 def test_specify_passphrase_via_env(mscp):
     src = File(os.getcwd() + "/src", size = 1024).make()