CHAP

Add unidirectional chap support so we can authenticate to the target.

Make the login phase more "intelligent" so we can iterate over login
pdus until we have reached full feature phase

Add a new helper functions to parse a iscsi url and break it down
into elements in a structure

Update iscsi-inq to allow CHAP authentication

include/iscsi-private.h

@@ -44,6 +44,10 @@ struct iscsi_context {
 	const char *initiator_name;
 	const char *target_name;
 	const char *alias;
+
+	const char *user;
+	const char *passwd;
+
 	enum iscsi_session_type session_type;
 	unsigned char isid[6];
 	uint32_t itt;
@@ -56,8 +60,20 @@ struct iscsi_context {
 
 	int fd;
 	int is_connected;
+
+	int current_phase;
+	int next_phase;
+#define ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP         0
+#define ISCSI_LOGIN_SECNEG_PHASE_SELECT_ALGORITHM   1
+#define ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE      2
+	int secneg_phase;
+	int login_attempts;
 	int is_loggedin;
 
+	int chap_a;
+	int chap_i;
+	char *chap_c;
+
 	iscsi_command_cb socket_status_cb;
 	void *connect_data;