public static string ConstructCommandLine(int packetSize, int timeout, string address, bool ipv4, int ttl = 0, PingFragmentOptions fragmentOption = PingFragmentOptions.Default)
{
var sb = new StringBuilder();
sb.Append("-c 1"); // Just send a single ping ("count = 1")
//if timeout is zero then some ping implementations can stuck infinitely if endpoint is unreachable
if (timeout == 0)
{
timeout = 1;
}
// Pass timeout argument to ping utility
// BusyBox, Linux: ping and ping6 requires -W flag which accepts timeout in SECONDS.
// FreeBSD: ping requires -W flag which accepts timeout in MILLISECONDS;
// ping6 requires -x which accepts timeout in MILLISECONDS
// OSX: ping requires -W flag which accepts timeout in MILLISECONDS; ping6 doesn't support timeout
if (OperatingSystem.IsFreeBSD())
{
if (ipv4)
{
sb.Append(" -W ");
}
else
{
sb.Append(" -x ");
}
}
else if (OperatingSystem.IsMacOS())
{
if (ipv4)
{
sb.Append(" -W ");
}
else
{
goto skipped_timeout;
}
}
else
{
sb.Append(" -W ");
const int millisInSecond = 1000;
timeout = Math.DivRem(timeout, millisInSecond, out int remainder);
if (remainder != 0)
{
timeout += 1;
}
}
sb.Append(timeout);
skipped_timeout:
// The command-line flags for "Do-not-fragment" and "TTL" are not standard.
// In fact, they are different even between ping and ping6 on the same machine.
// The ping utility is not flexible enough to specify an exact payload.
// But we can at least send the right number of bytes.
if (ttl > 0)
{
if (OperatingSystem.IsFreeBSD() || OperatingSystem.IsMacOS())
{
// OSX and FreeBSD use -h to set hop limit for IPv6 and -m ttl for IPv4
if (ipv4)
{
sb.Append(" -m ");
}
else
{
sb.Append(" -h ");
}
}
else
{
// Linux uses -t ttl for both IPv4 & IPv6
sb.Append(" -t ");
}
sb.Append(ttl);
}
if (fragmentOption != PingFragmentOptions.Default)
{
if (OperatingSystem.IsFreeBSD() || OperatingSystem.IsMacOS())
{
// The bit is off by default on OSX & FreeBSD
if (fragmentOption == PingFragmentOptions.Dont)
{
sb.Append(" -D ");
}
}
else if (!s_isBusybox.Value) // busybox implementation does not support fragmentation option.
{
// Linux has three state option with default to use PMTU.
// When explicit option is used we set it explicitly to one or the other.
if (fragmentOption == PingFragmentOptions.Do)
{
sb.Append(" -M do ");
}
else
{
sb.Append(" -M dont ");
}
}
}
// ping and ping6 do not report timing information unless at least 16 bytes are sent.
if (packetSize < 16)
{
packetSize = 16;
}
sb.Append(" -s ");
sb.Append(packetSize);
sb.Append(' ');
sb.Append(address);
return(sb.ToString());
}
public static string ConstructCommandLine(int packetSize, string address, bool ipv4, int ttl = 0, PingFragmentOptions fragmentOption = PingFragmentOptions.Default)
{
StringBuilder sb = new StringBuilder();
sb.Append("-c 1"); // Just send a single ping ("count = 1")
// The command-line flags for "Do-not-fragment" and "TTL" are not standard.
// In fact, they are different even between ping and ping6 on the same machine.
// The ping utility is not flexible enough to specify an exact payload.
// But we can at least send the right number of bytes.
if (ttl > 0)
{
if (s_isBSD)
{
// OSX and FreeBSD use -h to set hop limit for IPv6 and -m ttl for IPv4
if (ipv4)
{
sb.Append(" -m ");
}
else
{
sb.Append(" -h ");
}
}
else
{
// Linux uses -t ttl for both IPv4 & IPv6
sb.Append(" -t ");
}
sb.Append(ttl);
}
if (fragmentOption != PingFragmentOptions.Default)
{
if (s_isBSD)
{
// The bit is off by default on OSX & FreeBSD
if (fragmentOption == PingFragmentOptions.Dont)
{
sb.Append(" -D ");
}
}
else if (!s_isBusybox.Value) // busybox implementation does not support fragmentation option.
{
// Linux has three state option with default to use PMTU.
// When explicit option is used we set it explicitly to one or the other.
if (fragmentOption == PingFragmentOptions.Do)
{
sb.Append(" -M do ");
}
else
{
sb.Append(" -M dont ");
}
}
}
// ping and ping6 do not report timing information unless at least 16 bytes are sent.
if (packetSize < 16)
{
packetSize = 16;
}
sb.Append(" -s ");
sb.Append(packetSize);
sb.Append(' ');
sb.Append(address);
return(sb.ToString());
}
