+/*
+ 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;
+
+ switch (addr->sa.sa_family) {
+ case AF_INET:
+ addr->ip.sin_port = 0;
+ break;
+ case AF_INET6:
+ addr->ip6.sin6_port = 0;
+ break;
+ }
+
+ s = socket(addr->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
+ if (s == -1) {
+ return false;
+ }
+
+ ret = bind(s, (struct sockaddr *)addr, sizeof(ctdb_sock_addr));
+
+ close(s);
+ return ret == 0;
+}