mscp: add -u max_startups option.

pymscp also accepts keyword 'max_startups' (int).

include/mscp.h

@@ -43,7 +43,7 @@ struct mscp_opts {
 	size_t	max_chunk_sz;	/** maximum chunk size (default file size/nr_threads) */
 	size_t	buf_sz;		/** buffer size, default 16k. */
 	char	coremask[MSCP_MAX_COREMASK_STR]; /** hex to specifiy usable cpu cores */
-	int	max_startups;	/* sshd MaxStartups conccurent connections */
+	int	max_startups;	/* sshd MaxStartups concurrent connections */
 
 	int	severity; 	/** messaging severity. set MSCP_SERVERITY_* */
 	int	msg_fd;		/** fd to output message. default STDOUT (0),

src/main.c

@@ -24,7 +24,7 @@
 void usage(bool print_help) {
 	printf("mscp v" VERSION ": copy files over multiple ssh connections\n"
 	       "\n"
-	       "Usage: mscp [vqDHdNh] [-n nr_conns] [-m coremask]\n"
+	       "Usage: mscp [vqDHdNh] [-n nr_conns] [-m coremask] [-u max_startups]\n"
 	       "            [-s min_chunk_sz] [-S max_chunk_sz] [-a nr_ahead] [-b buf_sz]\n"
 	       "            [-l login_name] [-p port] [-i identity_file]\n"
 	       "            [-c cipher_spec] [-M hmac_spec] [-C compress] source ... target\n"
@@ -36,6 +36,8 @@ void usage(bool print_help) {
 	printf("    -n NR_CONNECTIONS  number of connections "
 	       "(default: floor(log(cores)*2)+1)\n"
 	       "    -m COREMASK        hex value to specify cores where threads pinned\n"
+	       "    -u MAX_STARTUPS    number of concurrent outgoing connections "
+	       "(default: 8)\n"
 	       "    -s MIN_CHUNK_SIZE  min chunk size (default: 64MB)\n"
 	       "    -S MAX_CHUNK_SIZE  max chunk size (default: filesize/nr_conn)\n"
 	       "\n"
@@ -52,7 +54,8 @@ void usage(bool print_help) {
 	       "    -i IDENTITY        identity file for public key authentication\n"
 	       "    -c CIPHER          cipher spec\n"
 	       "    -M HMAC            hmac spec\n"
-	       "    -C COMPRESS        enable compression: yes, no, zlib, zlib@openssh.com\n"
+	       "    -C COMPRESS        enable compression: "
+	       "yes, no, zlib, zlib@openssh.com\n"
 	       "    -H                 disable hostkey check\n"
 	       "    -d                 increment ssh debug output level\n"
 	       "    -N                 enable Nagle's algorithm (default disabled)\n"
@@ -204,7 +207,7 @@ int main(int argc, char **argv)
 	memset(&o, 0, sizeof(o));
 	o.severity = MSCP_SEVERITY_WARN;
 
-	while ((ch = getopt(argc, argv, "n:m:s:S:a:b:vqDrl:p:i:c:M:C:HdNh")) != -1) {
+	while ((ch = getopt(argc, argv, "n:m:u:s:S:a:b:vqDrl:p:i:c:M:C:HdNh")) != -1) {
 		switch (ch) {
 		case 'n':
 			o.nr_threads = atoi(optarg);
@@ -217,6 +220,9 @@ int main(int argc, char **argv)
 		case 'm':
 			strncpy(o.coremask, optarg, sizeof(o.coremask));
 			break;
+		case 'u':
+			o.max_startups = atoi(optarg);
+			break;
 		case 's':
 			o.min_chunk_sz = atoi(optarg);
 			break;

src/mscp.c

@@ -26,7 +26,7 @@ struct mscp {
 	int			*cores;		/* usable cpu cores by COREMASK */
 	int			nr_cores;	/* length of array of cores */
 
-	sem_t			sem;		/* semaphore for conccurent 
+	sem_t			sem;		/* semaphore for concurrent 
 						 * connecting ssh sessions */
 
 	sftp_session		first;		/* first sftp session */
@@ -193,6 +193,10 @@ static int validate_and_set_defaut_params(struct mscp_opts *o)
 
 	if (o->max_startups == 0)
 		o->max_startups = DEFAULT_MAX_STARTUPS;
+	else if (o->max_startups < 0) {
+		mscp_set_error("invalid max_startups: %d", o->max_startups);
+		return -1;
+	}
 
 	if (o->msg_fd == 0)
 		o->msg_fd = STDOUT_FILENO;
@@ -219,8 +223,9 @@ struct mscp *mscp_init(const char *remote_host, int direction,
 
 	mprint_set_severity(o->severity);
 
-	if (validate_and_set_defaut_params(o) < 0)
+	if (validate_and_set_defaut_params(o) < 0) {
-		goto free_out;
+		return NULL;
+	}
 
 	m = malloc(sizeof(*m));
 	if (!m) {

src/pymscp.c

@@ -74,7 +74,7 @@ static int release_instance(struct instance *i)
 
 /* wrapper functions */
 
-static PyObject *wrap_mscp_init(PyObject *sef, PyObject *args, PyObject *kw)
+static PyObject *wrap_mscp_init(PyObject *self, PyObject *args, PyObject *kw)
 {
 	/*
 	 * Initialize struct mscp with options.  wrap_mscp_init
@@ -89,10 +89,14 @@ static PyObject *wrap_mscp_init(PyObject *sef, PyObject *args, PyObject *kw)
 		/* mscp_opts */
 		"nr_threads", 	/* int */
 		"nr_ahead",	/* int */
+
 		"min_chunk_sz",	/* unsigned long */
 		"max_chunk_sz",	/* unsigned long */
 		"buf_sz",	/* unsigned long */
+
 		"coremask",	/* const char * */
+
+		"max_startups",	/* int */
 		"severity",	/* int, MSCP_SERVERITY_* */
 		"msg_fd",	/* int */
 
@@ -100,17 +104,19 @@ static PyObject *wrap_mscp_init(PyObject *sef, PyObject *args, PyObject *kw)
 		"login_name",	/* const char * */
 		"port",		/* const char * */
 		"identity",	/* const char * */
+
 		"cipher",	/* const char * */
 		"hmac",		/* const char * */
 		"compress",	/* const char * */
 		"password",	/* const char * */
 		"passphrase",	/* const char * */
+
 		"debug_level",	/* int */
 		"no_hostkey_check",	/* bool */
 		"enable_nagle",		/* bool */
 		NULL,
 	};
-	const char *fmt = "si" "|iikkksii" "ssssssssipp";
+	const char *fmt = "si" "|" "ii" "kkk" "s" "iii" "sss" "sssss" "ipp";
 	char *coremask = NULL;
 	char *login_name = NULL, *port = NULL, *identity = NULL;
 	char *cipher = NULL, *hmac = NULL, *compress = NULL;
@@ -137,6 +143,7 @@ static PyObject *wrap_mscp_init(PyObject *sef, PyObject *args, PyObject *kw)
 					  &i->mo.max_chunk_sz,
 					  &i->mo.buf_sz,
 					  &coremask,
+					  &i->mo.max_startups,
 					  &i->mo.severity,
 					  &i->mo.msg_fd,
 					  &login_name,

test/test_python.py

@@ -71,6 +71,7 @@ param_kwargs = [
     { "min_chunk_sz": 1 * 1024 * 1024 },
     { "max_chunk_sz": 64 * 1024 * 1024 },
     { "coremask": "0x0f" },
+    { "max_startups": 5 },
     { "severity": mscp.SEVERITY_NONE },
     { "cipher": "aes128-gcm@openssh.com" },
     { "compress": "yes" },