src/icmp/Icmp4.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 37    ICMP Routines */
  10
  11 #ifndef _INCLUDE_ICMPV4_H
  12 #define _INCLUDE_ICMPV4_H
  13
  14 #include "Icmp.h"
  15
  16 #if HAVE_NETINET_IN_H
  17 #include <netinet/in.h>
  18 #endif
  19 #if HAVE_NETINET_IP_H
  20 #include <netinet/ip.h>
  21 #endif
  22 #if HAVE_NETINET_IP_ICMP_H
  23 #include <netinet/ip_icmp.h>
  24 #endif
  25
  26 #if !_SQUID_LINUX_ && !_SQUID_WINDOWS_
  27 #define icmphdr icmp
  28 #define iphdr ip
  29 #endif
  30
  31 /* Linux uses its own field names. */
  32 #if _SQUID_LINUX_
  33 #ifdef icmp_id
  34 #undef icmp_id
  35 #endif
  36 #ifdef icmp_seq
  37 #undef icmp_seq
  38 #endif
  39 #define icmp_type type
  40 #define icmp_code code
  41 #define icmp_cksum checksum
  42 #define icmp_id un.echo.id
  43 #define icmp_seq un.echo.sequence
  44 #define ip_hl ihl
  45 #define ip_v version
  46 #define ip_tos tos
  47 #define ip_len tot_len
  48 #define ip_id id
  49 #define ip_off frag_off
  50 #define ip_ttl ttl
  51 #define ip_p protocol
  52 #define ip_sum check
  53 #define ip_src saddr
  54 #define ip_dst daddr
  55 #endif
  56
  57 /* Native Windows port doesn't have netinet support, so we emulate it.
  58    At this time, Cygwin lacks icmp support in its include files, so we need
  59    to use the native Windows port definitions.
  60  */
  61
  62 #if _SQUID_WINDOWS_
  63 #include "fde.h"
  64
  65 #if _SQUID_WINDOWS_
  66
  67 #if HAVE_WINSOCK2_H
  68 #include <winsock2.h>
  69 #elif HAVE_WINSOCK_H
  70 #include <winsock.h>
  71 #endif
  72 #include <process.h>
  73
  74 #endif
  75
  76 /* IP Header */
  77 typedef struct iphdr {
  78
  79 uint8_t  ip_vhl:
  80     4;          /* Length of the header in dwords */
  81
  82 uint8_t  version:
  83     4;  /* Version of IP                  */
  84     uint8_t  tos;              /* Type of service                */
  85     uint16_t total_len;        /* Length of the packet in dwords */
  86     uint16_t ident;            /* unique identifier              */
  87     uint16_t flags;            /* Flags                          */
  88     uint8_t  ip_ttl;           /* Time to live                   */
  89     uint8_t  proto;            /* Protocol number (TCP, UDP etc) */
  90     uint16_t checksum;         /* IP checksum                    */
  91     uint32_t source_ip;
  92     uint32_t dest_ip;
  93 } iphdr;
  94
  95 /* ICMP header */
  96 typedef struct icmphdr {
  97     uint8_t  icmp_type;        /* ICMP packet type                 */
  98     uint8_t  icmp_code;        /* Type sub code                    */
  99     uint16_t icmp_cksum;
 100     uint16_t icmp_id;
 101     uint16_t icmp_seq;
 102     uint32_t timestamp;        /* not part of ICMP, but we need it */
 103 } icmphdr;
 104
 105 #endif  /* _SQUID_WINDOWS_ */
 106
 107 #ifndef ICMP_ECHO
 108 #define ICMP_ECHO 8
 109 #endif
 110
 111 #ifndef ICMP_ECHOREPLY
 112 #define ICMP_ECHOREPLY 0
 113 #endif
 114
 115 #ifndef IPPROTO_ICMP
 116 #define IPPROTO_ICMP 1
 117 #endif
 118
 119 /* some OS apparently define icmp instead of icmphdr */
 120 #if !defined(icmphdr) && defined(icmp)
 121 #define icmphdr icmp
 122 #endif
 123
 124 /* some OS apparently define ip instead of iphdr */
 125 #if !defined(iphdr) && defined(ip)
 126 #define iphdr ip
 127 #endif
 128
 129 /**
 130  * Class partially implementing RFC 792 - ICMP for IP version 4.
 131  * Provides ECHO-REQUEST, ECHO-REPLY (secion 4.1)
 132  */
 133 class Icmp4 : public Icmp
 134 {
 135 public:
 136     Icmp4();
 137     virtual ~Icmp4();
 138
 139     virtual int Open();
 140
 141 #if USE_ICMP
 142     virtual void SendEcho(Ip::Address &, int, const char*, int);
 143     virtual void Recv(void);
 144 #endif
 145 };
 146
 147 #if USE_ICMP
 148
 149 /// pinger helper contains one of these as a global object.
 150 extern Icmp4 icmp4;
 151
 152 #endif /* USE_ICMP && SQUID_HELPER */
 153
 154 #endif
 155