src/icmp/Icmp.cc

   1 /*
   2  * Copyright (C) 1996-2023 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 #include "squid.h"
  12 #include "debug/Stream.h"
  13 #include "Icmp.h"
  14 #include "time/gadgets.h"
  15
  16 Icmp::Icmp()
  17 {
  18 #if USE_ICMP
  19     icmp_sock = -1;
  20     icmp_ident = 0;
  21 #endif
  22 }
  23
  24 void
  25 Icmp::Close()
  26 {
  27 #if USE_ICMP
  28     if (icmp_sock > 0)
  29         close(icmp_sock);
  30     icmp_sock = -1;
  31     icmp_ident = 0;
  32 #endif
  33 }
  34
  35 #if USE_ICMP
  36
  37 int
  38 Icmp::CheckSum(unsigned short *ptr, int size)
  39 {
  40     long sum;
  41     unsigned short oddbyte;
  42     unsigned short answer;
  43
  44     if (!ptr) return (int)htons(0xffff); // bad input.
  45
  46     sum = 0;
  47
  48     while (size > 1) {
  49         sum += *ptr;
  50         ++ptr;
  51         size -= 2;
  52     }
  53
  54     if (size == 1) {
  55         oddbyte = 0;
  56         *((unsigned char *) &oddbyte) = *(unsigned char *) ptr;
  57         sum += oddbyte;
  58     }
  59
  60     sum = (sum >> 16) + (sum & 0xffff);
  61     sum += (sum >> 16);
  62     answer = (unsigned short) ~sum;
  63     return (answer);
  64 }
  65
  66 int
  67 Icmp::ipHops(int ttl)
  68 {
  69     if (ttl < 33)
  70         return 33 - ttl;
  71
  72     if (ttl < 63)
  73         return 63 - ttl;        /* 62 = (64+60)/2 */
  74
  75     if (ttl < 65)
  76         return 65 - ttl;        /* 62 = (64+60)/2 */
  77
  78     if (ttl < 129)
  79         return 129 - ttl;
  80
  81     if (ttl < 193)
  82         return 193 - ttl;
  83
  84     return 256 - ttl;
  85 }
  86
  87 void
  88 Icmp::Log(const Ip::Address &addr, const uint8_t type, const char* pkt_str, const int rtt, const int hops)
  89 {
  90     debugs(42, 2, "pingerLog: " << current_time << " " << std::left <<
  91            std::setw(45) << addr  << " " << type  <<
  92            " " << std::setw(15) << pkt_str << " " << rtt  <<
  93            "ms " << hops  << " hops");
  94 }
  95
  96 #endif /* USE_ICMP */
  97