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 <sys/socket.h>
  13 #include <linux/if_packet.h>
  14 #include <linux/if.h>
  15
  16 #include "ring.h"
  17 #include "tprintf.h"
  18 #include "pcap_io.h"
  19 #include "built_in.h"
  20
  21 #define PRINT_NORM              0
  22 #define PRINT_LESS              1
  23 #define PRINT_HEX               2
  24 #define PRINT_ASCII             3
  25 #define PRINT_HEX_ASCII         4
  26 #define PRINT_NONE              5
  27
  28 extern char *if_indextoname(unsigned ifindex, char *ifname);
  29
  30 static const char * const packet_types[256] = {
  31         [0 ... 255]             =       "?",  /* Unknown */
  32         [PACKET_HOST]           =       "<",  /* Incoming */
  33         [PACKET_BROADCAST]      =       "B",  /* Broadcast */
  34         [PACKET_MULTICAST]      =       "M",  /* Multicast */
  35         [PACKET_OTHERHOST]      =       "P",  /* Promisc */
  36         [PACKET_OUTGOING]       =       ">",  /* Outgoing */
  37         [PACKET_USER]           =       ">U", /* To Userspace */
  38         [PACKET_KERNEL]         =       ">K", /* To Kernelspace */
  39 };
  40
  41 static inline const char *__show_ts_source(uint32_t status)
  42 {
  43         if (status & TP_STATUS_TS_RAW_HARDWARE)
  44                 return "(raw hw ts)";
  45         else if (status & TP_STATUS_TS_SYS_HARDWARE)
  46                 return "(sys hw ts)";
  47         else if (status & TP_STATUS_TS_SOFTWARE)
  48                 return "(sw ts)";
  49         else
  50                 return "";
  51 }
  52
  53 static inline void __show_frame_hdr(struct sockaddr_ll *s_ll,
  54                                     void *raw, int mode, bool v3)
  55 {
  56         char tmp[IFNAMSIZ];
  57         union tpacket_uhdr hdr;
  58
  59         if (mode == PRINT_NONE)
  60                 return;
  61
  62         hdr.raw = raw;
  63         switch (mode) {
  64         case PRINT_LESS:
  65                 tprintf("%s %s %u",
  66                         packet_types[s_ll->sll_pkttype] ? : "?",
  67                         if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
  68                         v3 ? hdr.h3->tp_len : hdr.h2->tp_len);
  69                 break;
  70         default:
  71                 tprintf("%s %s %u %us.%uns %s\n",
  72                         packet_types[s_ll->sll_pkttype] ? : "?",
  73                         if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
  74                         v3 ? hdr.h3->tp_len : hdr.h2->tp_len,
  75                         v3 ? hdr.h3->tp_sec : hdr.h2->tp_sec,
  76                         v3 ? hdr.h3->tp_nsec : hdr.h2->tp_nsec,
  77                         v3 ? "" : __show_ts_source(hdr.h2->tp_status));
  78                 break;
  79         }
  80 }
  81
  82 static inline void show_frame_hdr(struct frame_map *hdr, int mode)
  83 {
  84         __show_frame_hdr(&hdr->s_ll, &hdr->tp_h, mode, false);
  85 }
  86
  87 extern void dissector_init_all(int fnttype);
  88 extern void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode);
  89 extern void dissector_cleanup_all(void);
  90 extern int dissector_set_print_type(void *ptr, int type);
  91
  92 #endif /* DISSECTOR_H */