dissector.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2009 - 2013 Daniel Borkmann.
   4  * Subject to the GPL, version 2.
   5  */
   6
   7 #ifndef DISSECTOR_H
   8 #define DISSECTOR_H
   9
  10 #include <stdlib.h>
  11 #include <stdint.h>
  12 #include <linux/if_packet.h>
  13
  14 #include "ring.h"
  15 #include "tprintf.h"
  16 #include "pcap_io.h"
  17 #include "built_in.h"
  18
  19 #define PRINT_NORM              0
  20 #define PRINT_LESS              1
  21 #define PRINT_HEX               2
  22 #define PRINT_ASCII             3
  23 #define PRINT_HEX_ASCII         4
  24 #define PRINT_NONE              5
  25
  26 static const char * const packet_types[256]={
  27         "<", /* Incoming */
  28         "B", /* Broadcast */
  29         "M", /* Multicast */
  30         "P", /* Promisc */
  31         ">", /* Outgoing */
  32         "?", /* Unknown */
  33 };
  34
  35 extern char *if_indextoname(unsigned ifindex, char *ifname);
  36
  37 static inline const char *__show_ts_source(uint32_t status)
  38 {
  39         if (status & TP_STATUS_TS_RAW_HARDWARE)
  40                 return "(raw hw ts)";
  41         else if (status & TP_STATUS_TS_SYS_HARDWARE)
  42                 return "(sys hw ts)";
  43         else if (status & TP_STATUS_TS_SOFTWARE)
  44                 return "(sw ts)";
  45         else
  46                 return "";
  47 }
  48
  49 static inline void __show_frame_hdr(struct sockaddr_ll *s_ll,
  50                                     void *raw, int mode, bool v3)
  51 {
  52         char tmp[IFNAMSIZ];
  53         union tpacket_uhdr hdr;
  54
  55         if (mode == PRINT_NONE)
  56                 return;
  57
  58         hdr.raw = raw;
  59
  60         switch (mode) {
  61         case PRINT_LESS:
  62                 tprintf("%s %s %u",
  63                         packet_types[s_ll->sll_pkttype] ? : "?",
  64                         if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
  65                         v3 ? hdr.h3->tp_len : hdr.h2->tp_len);
  66                 break;
  67         default:
  68                 tprintf("%s %s %u %us.%uns %s\n",
  69                         packet_types[s_ll->sll_pkttype] ? : "?",
  70                         if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
  71                         v3 ? hdr.h3->tp_len : hdr.h2->tp_len,
  72                         v3 ? hdr.h3->tp_sec : hdr.h2->tp_sec,
  73                         v3 ? hdr.h3->tp_nsec : hdr.h2->tp_nsec,
  74                         v3 ? "" : __show_ts_source(hdr.h2->tp_status));
  75                 break;
  76         }
  77 }
  78
  79 static inline void show_frame_hdr(struct frame_map *hdr, int mode)
  80 {
  81         __show_frame_hdr(&hdr->s_ll, &hdr->tp_h, mode, false);
  82 }
  83
  84 extern void dissector_init_all(int fnttype);
  85 extern void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode);
  86 extern void dissector_cleanup_all(void);
  87 extern int dissector_set_print_type(void *ptr, int type);
  88
  89 #endif /* DISSECTOR_H */