add -H option to disable host key check

tests use this option.

src/main.c

@@ -82,7 +82,7 @@ int list_count(struct list_head *head)
 void usage(bool print_help) {
 	printf("mscp v" VERSION ": copy files over multiple ssh connections\n"
 	       "\n"
-	       "Usage: mscp [CvqDdh] [-n nr_conns]\n"
+	       "Usage: mscp [vqDCHdh] [-n nr_conns]\n"
 	       "            [-s min_chunk_sz] [-S max_chunk_sz]\n"
 	       "            [-b sftp_buf_sz] [-B io_buf_sz]\n"
 	       "            [-l login_name] [-p port] [-i identity_file]\n"
@@ -108,6 +108,7 @@ void usage(bool print_help) {
 	       "    -i IDENTITY        identity file for publickey authentication\n"
 	       "    -c CIPHER          cipher spec, see `ssh -Q cipher`\n"
 	       "    -C                 enable compression on libssh\n"
+	       "    -H                 disable hostkey check\n"
 	       "    -d                 increment ssh debug output level\n"
 	       "    -h                 print this help\n"
 	       "\n");
@@ -178,7 +179,7 @@ int main(int argc, char **argv)
 	nr_threads = (int)(nr_cpus() / 2);
 	nr_threads = nr_threads == 0 ? 1 : nr_threads;
 
-	while ((ch = getopt(argc, argv, "n:s:S:b:B:vqDl:p:i:c:Cdh")) != -1) {
+	while ((ch = getopt(argc, argv, "n:s:S:b:B:vqDl:p:i:c:CHdh")) != -1) {
 		switch (ch) {
 		case 'n':
 			nr_threads = atoi(optarg);
@@ -255,6 +256,9 @@ int main(int argc, char **argv)
 		case 'C':
 			opts.compress++;
 			break;
+		case 'H':
+			opts.no_hostkey_check = true;
+			break;
 		case 'd':
 			opts.debuglevel++;
 			break;

src/ssh.c

@@ -106,7 +106,7 @@ static ssh_session ssh_make_ssh_session(char *sshdst, struct ssh_opts *opts)
 		goto disconnect_out;
 	}
 
-	if (ssh_verify_known_hosts(ssh) != 0) {
+	if (!opts->no_hostkey_check && ssh_verify_known_hosts(ssh) != 0) {
 		goto disconnect_out;
 	}
 

src/ssh.h

@@ -1,19 +1,21 @@
 #ifndef _SSH_H_
 #define _SSH_H_
 
+#include <stdbool.h>
 #include <libssh/libssh.h>
 #include <libssh/sftp.h>
 
 
 struct ssh_opts {
-	char    *login_name;    /* -l */
-	char    *port;          /* -p */
-	char    *identity;      /* -i */
-	char    *cipher;        /* -c */
-	int     compress;       /* -C */
-	int     debuglevel;     /* -v */
+	char    *login_name;		/* -l */
+	char    *port;			/* -p */
+	char    *identity;		/* -i */
+	char    *cipher;		/* -c */
+	int     compress;		/* -C */
+	int     debuglevel;		/* -v */
+	bool	no_hostkey_check;	/* -H */
 
-	char    *password;      /* filled at the first connecting phase */
+	char    *password;		/* filled at the first connecting phase */
 };
 
 /* ssh_make_sftp_session() creates sftp_session. sshdst accpets