kludge around problem with Netgear DM602 authentication

[l2tpns.git] / control.h

diff --git a/control.h b/control.h
index 041d3ce..e1f7d54 100644 (file)
--- a/control.h
+++ b/control.h
@@ -1,18 +1,54 @@
 #ifndef __CONTROL_H__
 #define __CONTROL_H__
 
-#define PKT_RESP_OK            1
-#define PKT_RESP_ERROR         2
+#define NSCTL_PORT             1702
+#define NSCTL_MAGIC            0x9013
 
-#define PKT_LOAD_PLUGIN                5
-#define PKT_UNLOAD_PLUGIN      6
+/* builtin commands */
+#define NSCTL_REQUEST          (1 << 4)
+#define NSCTL_REQ_LOAD         (NSCTL_REQUEST | 1)
+#define NSCTL_REQ_UNLOAD       (NSCTL_REQUEST | 2)
+#define NSCTL_REQ_HELP         (NSCTL_REQUEST | 3)
 
-#define PKT_GARDEN             1000
-#define PKT_UNGARDEN           1001
+/* general control message, passed to plugins */
+#define NSCTL_REQ_CONTROL      (NSCTL_REQUEST | 4)
 
-int new_packet(short type, char *packet);
-int send_packet(int sockfd, int dest_ip, int dest_port, char *packet, int len);
-void dump_packet(char *packet, FILE *stream);
-int read_packet(int sockfd, char *packet);
+/* response messages */
+#define NSCTL_RESPONSE         (1 << 5)
+#define NSCTL_RES_OK           (NSCTL_RESPONSE | 1)
+#define NSCTL_RES_ERR          (NSCTL_RESPONSE | 2)
 
-#endif
+/* unpack errors */
+#define NSCTL_ERR_SHORT                -1      // short packet
+#define NSCTL_ERR_LONG         -2      // packet exceeds max, or trailing cr*p
+#define NSCTL_ERR_MAGIC                -3      // invalid magic number
+#define NSCTL_ERR_TYPE         -4      // unrecognised type
+
+#define NSCTL_MAX_PKT_SZ       4096
+
+struct nsctl_packet {
+    uint16_t magic;
+    uint8_t type;
+    uint8_t argc;
+    char argv[NSCTL_MAX_PKT_SZ - 4];
+} __attribute__ ((packed));
+
+#define NSCTL_MAX_ARG_SZ       512
+
+struct nsctl_args {
+    uint8_t len;
+    char value[NSCTL_MAX_ARG_SZ - 1];
+} __attribute__ ((packed));
+
+/* parsed packet */
+struct nsctl {
+    uint8_t type;
+    uint8_t argc;
+    char *argv[0xff];
+};
+
+int pack_control(uint8_t *data, int len, uint8_t type, int argc, char *argv[]);
+int unpack_control(struct nsctl *packet, uint8_t *data, int len);
+void dump_control(struct nsctl *control, FILE *stream);
+
+#endif /* __CONTROL_H__ */