src/proto_struct.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>.
   4  * Copyright (C) 2009, 2010 Daniel Borkmann
   5  * Copyright (C) 2012 Christoph Jaeger <christoph@netsniff-ng.org>
   6  * Subject to the GPL, version 2.
   7  */
   8
   9 #ifndef PROTO_H
  10 #define PROTO_H
  11
  12 #include <ctype.h>
  13 #include <stdint.h>
  14
  15 #include "hash.h"
  16 #include "tprintf.h"
  17
  18 /* necessary forward declarations */
  19 struct pkt_buff;
  20 static inline unsigned int pkt_len(struct pkt_buff *pkt);
  21 static uint8_t *pkt_pull(struct pkt_buff *pkt, unsigned int len);
  22
  23 struct protocol {
  24         /* Needs to be filled out by user */
  25         unsigned int key;
  26         void (*print_full)(struct pkt_buff *pkt);
  27         void (*print_less)(struct pkt_buff *pkt);
  28         /* Used by program logic */
  29         struct protocol *next;
  30         void (*process)   (struct pkt_buff *pkt);
  31 };
  32
  33 static inline void empty(struct pkt_buff *pkt) {}
  34
  35 static inline void _hex(uint8_t *ptr, size_t len)
  36 {
  37         if (!len)
  38                 return;
  39
  40         tprintf(" [ hex ");
  41         for (; ptr && len-- > 0; ptr++)
  42                 tprintf(" %.2x", *ptr);
  43         tprintf(" ]\n");
  44 }
  45
  46 static inline void hex(struct pkt_buff *pkt)
  47 {
  48         size_t len = pkt_len(pkt);
  49
  50         if (!len)
  51                 return;
  52
  53         _hex(pkt_pull(pkt, len), len);
  54         tprintf("\n");
  55 }
  56
  57 static inline void _ascii(uint8_t *ptr, size_t len)
  58 {
  59         if (!len)
  60                 return;
  61
  62         tprintf(" [ chr ");
  63         for (; ptr && len-- > 0; ptr++)
  64                 tprintf(" %c ", isprint(*ptr) ? *ptr : '.');
  65         tprintf(" ]\n");
  66 }
  67
  68 static inline void ascii(struct pkt_buff *pkt)
  69 {
  70         size_t len = pkt_len(pkt);
  71
  72         if (!len)
  73                 return;
  74
  75         _ascii(pkt_pull(pkt, len), len);
  76         tprintf("\n");
  77 }
  78
  79 static inline void hex_ascii(struct pkt_buff *pkt)
  80 {
  81         size_t   len = pkt_len(pkt);
  82         uint8_t *ptr = pkt_pull(pkt, len);
  83
  84         if (!len)
  85                 return;
  86
  87         _hex(ptr, len);
  88         _ascii(ptr, len);
  89         tprintf("\n");
  90 }
  91
  92 #endif /* PROTO_H */