include: Fix segfault in getIssueBanner, add missing wrappers in libsshpp

Also make some private properties protected

Signed-off-by: Marcin Szalowicz <marcin.szalowicz@oracle.com>

include/libssh/libsshpp.hpp

@@ -194,6 +194,43 @@ public:
     ssh_throw(ret);
     return ret;
   }
+
+  /** @brief Authenticate through the "keyboard-interactive" method.
+   * @param[in] The username to authenticate. You can specify NULL if ssh_option_set_username() has been used. You cannot try two different logins in a row.
+   * @param[in] Undocumented. Set it to NULL.
+   * @throws SshException on error
+   * @returns SSH_AUTH_SUCCESS, SSH_AUTH_PARTIAL, SSH_AUTH_DENIED, SSH_AUTH_ERROR, SSH_AUTH_INFO, SSH_AUTH_AGAIN
+   * @see ssh_userauth_kbdint
+   */
+  int userauthKbdint(const char* username, const char* submethods){
+    int ret=ssh_userauth_kbdint(c_session,NULL,NULL);
+    ssh_throw(ret);
+    return ret;
+  }
+
+  /** @brief Get the number of prompts (questions) the server has given.
+   * @returns The number of prompts.
+   * @see ssh_userauth_kbdint_getnprompts
+   */
+  int userauthKbdintGetNPrompts(){
+    return ssh_userauth_kbdint_getnprompts(c_session);
+  }
+
+  /** @brief Set the answer for a question from a message block..
+   * @param[in] index The number of the ith prompt.
+   * @param[in] The answer to give to the server. The answer MUST be encoded UTF-8. It is up to the server how to interpret the value and validate it. However, if you read the answer in some other encoding, you MUST convert it to UTF-8.
+   * @throws SshException on error
+   * @returns 0 on success, < 0 on error
+   * @see ssh_userauth_kbdint_setanswer
+   */
+  int userauthKbdintSetAnswer(unsigned int i, const char* answer){
+    int ret=ssh_userauth_kbdint_setanswer(c_session, i, answer);
+    ssh_throw(ret);
+    return ret;
+  }
+
+
+
   /** @brief Authenticates using the password method.
    * @param[in] password password to use for authentication
    * @throws SshException on error
@@ -228,8 +265,7 @@ public:
     ssh_throw(ret);
     return ret;
   }
-  int userauthPrivatekeyFile(const char *filename,
-      const char *passphrase);
+
   /** @brief Returns the available authentication methods from the server
    * @throws SshException on error
    * @returns Bitfield of available methods.
@@ -281,8 +317,12 @@ public:
    */
   std::string getIssueBanner(){
     char *banner=ssh_get_issue_banner(c_session);
-    std::string ret= std::string(banner);
-    ::free(banner);
+    std::string ret;
+    if (banner)
+    {
+      ret= std::string(banner);
+      ::free(banner);
+    }
     return ret;
   }
   /** @brief returns the OpenSSH version (server) if possible
@@ -378,11 +418,14 @@ public:
     return_throwable;
   }
 
-private:
-  ssh_session c_session;
   ssh_session getCSession(){
     return c_session;
   }
+
+protected:
+  ssh_session c_session;
+
+private:
   /* No copy constructor, no = operator */
   Session(const Session &);
   Session& operator=(const Session &);
@@ -481,12 +524,12 @@ public:
     ssh_throw(err);
     return err;
   }
-  int read(void *dest, size_t count, bool is_stderr){
+  int read(void *dest, size_t count){
     int err;
     /* handle int overflow */
     if(count > 0x7fffffff)
       count = 0x7fffffff;
-    err=ssh_channel_read_timeout(channel,dest,count,is_stderr,-1);
+    err=ssh_channel_read_timeout(channel,dest,count,false,-1);
     ssh_throw(err);
     return err;
   }
@@ -584,16 +627,24 @@ public:
     ssh_throw(ret);
     return ret;
   }
-private:
+
   ssh_session getCSession(){
     return session->getCSession();
   }
+
+  ssh_channel getCChannel() {
+    return channel;
+  }
+
+protected:
+  Session *session;
+  ssh_channel channel;
+
+private:
   Channel (Session &session, ssh_channel c_channel){
     this->channel=c_channel;
     this->session=&session;
   }
-  Session *session;
-  ssh_channel channel;
   /* No copy and no = operator */
   Channel(const Channel &);
   Channel &operator=(const Channel &);