control.h

   1 #ifndef __CONTROL_H__
   2 #define __CONTROL_H__
   3
   4 #define NSCTL_PORT              1702
   5 #define NSCTL_MAGIC             0x9013
   6
   7 /* builtin commands */
   8 #define NSCTL_REQUEST           (1 << 4)
   9 #define NSCTL_REQ_LOAD          (NSCTL_REQUEST | 1)
  10 #define NSCTL_REQ_UNLOAD        (NSCTL_REQUEST | 2)
  11 #define NSCTL_REQ_HELP          (NSCTL_REQUEST | 3)
  12
  13 /* general control message, passed to plugins */
  14 #define NSCTL_REQ_CONTROL       (NSCTL_REQUEST | 4)
  15
  16 /* response messages */
  17 #define NSCTL_RESPONSE          (1 << 5)
  18 #define NSCTL_RES_OK            (NSCTL_RESPONSE | 1)
  19 #define NSCTL_RES_ERR           (NSCTL_RESPONSE | 2)
  20
  21 /* unpack errors */
  22 #define NSCTL_ERR_SHORT         -1      // short packet
  23 #define NSCTL_ERR_LONG          -2      // packet exceeds max, or trailing cr*p
  24 #define NSCTL_ERR_MAGIC         -3      // invalid magic number
  25 #define NSCTL_ERR_TYPE          -4      // unrecognised type
  26
  27 #define NSCTL_MAX_PKT_SZ        4096
  28
  29 struct nsctl_packet {
  30     uint16_t magic;
  31     uint8_t type;
  32     uint8_t argc;
  33     char argv[NSCTL_MAX_PKT_SZ - 4];
  34 } __attribute__ ((packed));
  35
  36 #define NSCTL_MAX_ARG_SZ        512
  37
  38 struct nsctl_args {
  39     uint8_t len;
  40     char value[NSCTL_MAX_ARG_SZ - 1];
  41 } __attribute__ ((packed));
  42
  43 /* parsed packet */
  44 struct nsctl {
  45     uint8_t type;
  46     uint8_t argc;
  47     char *argv[0xff];
  48 };
  49
  50 int pack_control(char *data, int len, uint8_t type, int argc, char *argv[]);
  51 int unpack_control(struct nsctl *packet, char *data, int len);
  52 void dump_control(struct nsctl *control, FILE *stream);
  53
  54 #endif /* __CONTROL_H__ */