Icmp.cc

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/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
/* DEBUG: section 37    ICMP Routines */
 
#include "squid.h"
#include "compat/unistd.h"
#include "debug/Stream.h"
#include "Icmp.h"
#include "time/gadgets.h"
 
Icmp::Icmp()
{
#if USE_ICMP
    icmp_sock = -1;
    icmp_ident = 0;
#endif
}
 
void
Icmp::Close()
{
#if USE_ICMP
    if (icmp_sock > 0)
        xclose(icmp_sock);
    icmp_sock = -1;
    icmp_ident = 0;
#endif
}
 
#if USE_ICMP
 
int
Icmp::CheckSum(unsigned short *ptr, int size)
{
    long sum;
    unsigned short oddbyte;
    unsigned short answer;
 
    if (!ptr) return (int)htons(0xffff); // bad input.
 
    sum = 0;
 
    while (size > 1) {
        sum += *ptr;
        ++ptr;
        size -= 2;
    }
 
    if (size == 1) {
        oddbyte = 0;
        *((unsigned char *) &oddbyte) = *(unsigned char *) ptr;
        sum += oddbyte;
    }
 
    sum = (sum >> 16) + (sum & 0xffff);
    sum += (sum >> 16);
    answer = (unsigned short) ~sum;
    return (answer);
}
 
int
Icmp::ipHops(int ttl)
{
    if (ttl < 33)
        return 33 - ttl;
 
    if (ttl < 63)
        return 63 - ttl;        /* 62 = (64+60)/2 */
 
    if (ttl < 65)
        return 65 - ttl;        /* 62 = (64+60)/2 */
 
    if (ttl < 129)
        return 129 - ttl;
 
    if (ttl < 193)
        return 193 - ttl;
 
    return 256 - ttl;
}
 
void
Icmp::Log(const Ip::Address &addr, const uint8_t type, const char* pkt_str, const int rtt, const int hops)
{
    debugs(42, 2, "pingerLog: " << current_time << " " << std::left <<
           std::setw(45) << addr  << " " << type  <<
           " " << std::setw(15) << pkt_str << " " << rtt  <<
           "ms " << hops  << " hops");
}
 
#endif /* USE_ICMP */