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/*
ctdb system specific code to manage raw sockets on linux
Copyright (C) Ronnie Sahlberg 2007
Copyright (C) Andrew Tridgell 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/network.h"
/*
uint16 checksum for n bytes
*/
uint32_t uint16_checksum(uint16_t *data, size_t n)
{
uint32_t sum=0;
while (n>=2) {
sum += (uint32_t)ntohs(*data);
data++;
n -= 2;
}
if (n == 1) {
sum += (uint32_t)ntohs(*(uint8_t *)data);
}
return sum;
}
/*
see if we currently have an interface with the given IP
we try to bind to it, and if that fails then we don't have that IP
on an interface
*/
bool ctdb_sys_have_ip(ctdb_sock_addr *_addr)
{
int s;
int ret;
ctdb_sock_addr __addr = *_addr;
ctdb_sock_addr *addr = &__addr;
socklen_t addrlen;
switch (addr->sa.sa_family) {
case AF_INET:
addr->ip.sin_port = 0;
addrlen = sizeof(struct sockaddr_in);
break;
case AF_INET6:
addr->ip6.sin6_port = 0;
addrlen = sizeof(struct sockaddr_in6);
break;
}
s = socket(addr->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
if (s == -1) {
return false;
}
ret = bind(s, (struct sockaddr *)addr, addrlen);
close(s);
return ret == 0;
}
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