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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"
#include "ctdb_private.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 = 0;
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;
}
/* find which interface an ip address is currently assigned to */
char *ctdb_sys_find_ifname(ctdb_sock_addr *addr)
{
int s;
int size;
struct ifconf ifc;
char *ptr;
s = socket(AF_INET, SOCK_RAW, htons(IPPROTO_RAW));
if (s == -1) {
DEBUG(DEBUG_CRIT,(__location__ " failed to open raw socket (%s)\n",
strerror(errno)));
return NULL;
}
size = sizeof(struct ifreq);
ifc.ifc_buf = NULL;
ifc.ifc_len = size;
while(ifc.ifc_len > (size - sizeof(struct ifreq))) {
size *= 2;
free(ifc.ifc_buf);
ifc.ifc_len = size;
ifc.ifc_buf = malloc(size);
memset(ifc.ifc_buf, 0, size);
if (ioctl(s, SIOCGIFCONF, (caddr_t)&ifc) < 0) {
DEBUG(DEBUG_CRIT,("Failed to read ifc buffer from socket\n"));
free(ifc.ifc_buf);
close(s);
return NULL;
}
}
for (ptr =(char *)ifc.ifc_buf; ptr < ((char *)ifc.ifc_buf) + ifc.ifc_len; ) {
char *ifname;
struct ifreq *ifr;
ifr = (struct ifreq *)ptr;
#ifdef HAVE_SOCKADDR_LEN
if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr)) {
ptr += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
} else {
ptr += sizeof(ifr->ifr_name) + sizeof(struct sockaddr);
}
#else
ptr += sizeof(struct ifreq);
#endif
if (ifr->ifr_addr.sa_family != addr->sa.sa_family) {
continue;
}
switch (addr->sa.sa_family) {
case AF_INET:
if (memcmp(&addr->ip.sin_addr, &((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr, sizeof(addr->ip.sin_addr))) {
continue;
}
break;
case AF_INET6:
if (memcmp(&addr->ip6.sin6_addr, &((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_addr, sizeof(addr->ip6.sin6_addr))) {
continue;
}
break;
}
ifname = strdup(ifr->ifr_name);
free(ifc.ifc_buf);
close(s);
return ifname;
}
free(ifc.ifc_buf);
close(s);
return NULL;
}
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