src/icmp/Icmp.cc

   1 /*
   2  * DEBUG: section 37    ICMP Routines
   3  * AUTHOR: Duane Wessels, Amos Jeffries
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  */
  32 #include "squid.h"
  33 #include "Debug.h"
  34 #include "Icmp.h"
  35 #include "SquidTime.h"
  36
  37 Icmp::Icmp()
  38 {
  39 #if USE_ICMP
  40     icmp_sock = -1;
  41     icmp_ident = 0;
  42 #endif
  43 }
  44
  45 void
  46 Icmp::Close()
  47 {
  48 #if USE_ICMP
  49     if (icmp_sock > 0)
  50         close(icmp_sock);
  51     icmp_sock = -1;
  52     icmp_ident = 0;
  53 #endif
  54 }
  55
  56 #if USE_ICMP
  57
  58 int
  59 Icmp::CheckSum(unsigned short *ptr, int size)
  60 {
  61     long sum;
  62     unsigned short oddbyte;
  63     unsigned short answer;
  64
  65     if (!ptr) return (int)htons(0xffff); // bad input.
  66
  67     sum = 0;
  68
  69     while (size > 1) {
  70         sum += *ptr;
  71         ++ptr;
  72         size -= 2;
  73     }
  74
  75     if (size == 1) {
  76         oddbyte = 0;
  77         *((unsigned char *) &oddbyte) = *(unsigned char *) ptr;
  78         sum += oddbyte;
  79     }
  80
  81     sum = (sum >> 16) + (sum & 0xffff);
  82     sum += (sum >> 16);
  83     answer = (unsigned short) ~sum;
  84     return (answer);
  85 }
  86
  87 int
  88 Icmp::ipHops(int ttl)
  89 {
  90     if (ttl < 33)
  91         return 33 - ttl;
  92
  93     if (ttl < 63)
  94         return 63 - ttl;        /* 62 = (64+60)/2 */
  95
  96     if (ttl < 65)
  97         return 65 - ttl;        /* 62 = (64+60)/2 */
  98
  99     if (ttl < 129)
 100         return 129 - ttl;
 101
 102     if (ttl < 193)
 103         return 193 - ttl;
 104
 105     return 256 - ttl;
 106 }
 107
 108 void
 109 Icmp::Log(const Ip::Address &addr, const uint8_t type, const char* pkt_str, const int rtt, const int hops)
 110 {
 111     debugs(42, 2, "pingerLog: " << std::setw(9) << current_time.tv_sec  <<
 112            "." << std::setfill('0') << std::setw(6) <<
 113            current_time.tv_usec  << " " << std::left << std::setfill(' ') <<
 114            std::setw(45) << addr  << " " << type  <<
 115            " " << std::setw(15) << pkt_str << " " << rtt  <<
 116            "ms " << hops  << " hops");
 117 }
 118
 119 #endif /* USE_ICMP */