Load password and key for client fuzzer.

Add fuzz_dump()

fuzz.h

@@ -36,6 +36,7 @@ void fuzz_get_socket_address(int fd, char **local_host, char **local_port,
                         char **remote_host, char **remote_port, int host_lookup);
 void fuzz_fake_send_kexdh_reply(void);
 int fuzz_spawn_command(int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid);
+void fuzz_dump(const unsigned char* data, size_t len);
 
 // fake IO wrappers
 #ifndef FUZZ_SKIP_WRAP
@@ -61,6 +62,12 @@ struct dropbear_fuzz_options {
     // dropbear_exit() jumps back
     int do_jmp;
     sigjmp_buf jmp;
+
+    // write out decrypted session data to this FD if it's set
+    // flag - this needs to be set manually in cli-main.c etc
+    int dumping;
+    // the file descriptor
+    int recv_dumpfd;
 };
 
 extern struct dropbear_fuzz_options fuzz;