src/icmp/Icmp.cc

   1 /*
   2  * $Id: icmp.cc,v 1.94 2007/12/14 23:11:47 amosjeffries Exp $
   3  *
   4  * DEBUG: section 37    ICMP Routines
   5  * AUTHOR: Duane Wessels, Amos Jeffries
   6  *
   7  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   8  * ----------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from
  11  *  the Internet community; see the CONTRIBUTORS file for full
  12  *  details.   Many organizations have provided support for Squid's
  13  *  development; see the SPONSORS file for full details.  Squid is
  14  *  Copyrighted (C) 2001 by the Regents of the University of
  15  *  California; see the COPYRIGHT file for full details.  Squid
  16  *  incorporates software developed and/or copyrighted by other
  17  *  sources; see the CREDITS file for full details.
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  32  *
  33  */
  34 #include "squid.h"
  35 #include "Icmp.h"
  36 #include "SquidTime.h"
  37 #include "Debug.h"
  38
  39 Icmp::Icmp()
  40 {
  41 #if USE_ICMP
  42     icmp_sock = -1;
  43     icmp_ident = 0;
  44 #endif
  45 }
  46
  47 void
  48 Icmp::Close()
  49 {
  50 #if USE_ICMP
  51     if (icmp_sock > 0)
  52         close(icmp_sock);
  53     icmp_sock = -1;
  54     icmp_ident = 0;
  55 #endif
  56 }
  57
  58 #if USE_ICMP
  59
  60 int
  61 Icmp::CheckSum(unsigned short *ptr, int size)
  62 {
  63     long sum;
  64     unsigned short oddbyte;
  65     unsigned short answer;
  66
  67     if (!ptr) return 65535; // bad input.
  68
  69     sum = 0;
  70
  71     while (size > 1) {
  72         sum += *ptr++;
  73         size -= 2;
  74     }
  75
  76     if (size == 1) {
  77         oddbyte = 0;
  78         *((unsigned char *) &oddbyte) = *(unsigned char *) ptr;
  79         sum += oddbyte;
  80     }
  81
  82     sum = (sum >> 16) + (sum & 0xffff);
  83     sum += (sum >> 16);
  84     answer = (unsigned short) ~sum;
  85     return (answer);
  86 }
  87
  88 int
  89 Icmp::ipHops(int ttl)
  90 {
  91     if (ttl < 33)
  92         return 33 - ttl;
  93
  94     if (ttl < 63)
  95         return 63 - ttl;        /* 62 = (64+60)/2 */
  96
  97     if (ttl < 65)
  98         return 65 - ttl;        /* 62 = (64+60)/2 */
  99
 100     if (ttl < 129)
 101         return 129 - ttl;
 102
 103     if (ttl < 193)
 104         return 193 - ttl;
 105
 106     return 256 - ttl;
 107 }
 108
 109 void
 110 Icmp::Log(const IPAddress &addr, const u_int8_t type, const char* pkt_str, const int rtt, const int hops)
 111 {
 112     debugs(42, 2, "pingerLog: " << std::setw(9) << current_time.tv_sec  <<
 113            "." << std::setfill('0') << std::setw(6) <<
 114            current_time.tv_usec  << " " << std::left << std::setfill(' ') <<
 115            std::setw(45) << addr  << " " << type  <<
 116            " " << std::setw(15) << pkt_str << " " << rtt  <<
 117            "ms " << hops  << " hops");
 118 }
 119
 120 #endif /* USE_ICMP */