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totemip.c
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/*
* Copyright (c) 2005-2011 Red Hat, Inc.
*
* All rights reserved.
*
* Author: Patrick Caulfield (pcaulfie@redhat.com)
*
* This software licensed under BSD license, the text of which follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the MontaVista Software, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
/* IPv4/6 abstraction */
#include <config.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#if defined(COROSYNC_SOLARIS)
#include <net/if.h>
#include <sys/sockio.h>
#endif
#if defined(COROSYNC_BSD) || defined(COROSYNC_DARWIN)
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in_var.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#endif
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#if defined(COROSYNC_LINUX)
#include <net/if.h>
#include <asm/types.h>
#include <linux/rtnetlink.h>
#endif
#ifdef HAVE_GETIFADDRS
#include <ifaddrs.h>
#endif
#include <corosync/totem/totemip.h>
#include <corosync/swab.h>
#define LOCALHOST_IPV4 "127.0.0.1"
#define LOCALHOST_IPV6 "::1"
#define NETLINK_BUFSIZE 16384
#ifdef SO_NOSIGPIPE
void totemip_nosigpipe(int s)
{
int on = 1;
setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, (void *)&on, sizeof(on));
}
#endif
/* Compare two addresses */
int totemip_equal(const struct totem_ip_address *addr1,
const struct totem_ip_address *addr2)
{
int addrlen = 0;
if (addr1->family != addr2->family)
return 0;
if (addr1->family == AF_INET) {
addrlen = sizeof(struct in_addr);
}
if (addr1->family == AF_INET6) {
addrlen = sizeof(struct in6_addr);
}
assert(addrlen);
if (memcmp(addr1->addr, addr2->addr, addrlen) == 0)
return 1;
else
return 0;
}
/* Copy a totem_ip_address */
void totemip_copy(struct totem_ip_address *addr1,
const struct totem_ip_address *addr2)
{
memcpy(addr1, addr2, sizeof(struct totem_ip_address));
}
void totemip_copy_endian_convert(struct totem_ip_address *addr1,
const struct totem_ip_address *addr2)
{
addr1->nodeid = swab32(addr2->nodeid);
addr1->family = swab16(addr2->family);
memcpy(addr1->addr, addr2->addr, TOTEMIP_ADDRLEN);
}
/*
* Multicast address range is 224.0.0.0 to 239.255.255.255 this
* translates to the first 4 bits == 1110 (0xE).
* http://en.wikipedia.org/wiki/Multicast_address
*/
int32_t totemip_is_mcast(struct totem_ip_address *ip_addr)
{
uint32_t addr = 0;
memcpy (&addr, ip_addr->addr, sizeof (uint32_t));
if (ip_addr->family == AF_INET) {
addr = ntohl(addr);
if ((addr >> 28) != 0xE) {
return -1;
}
}
return 0;
}
/* For sorting etc. params are void * for qsort's benefit */
int totemip_compare(const void *a, const void *b)
{
int i;
const struct totem_ip_address *totemip_a = (const struct totem_ip_address *)a;
const struct totem_ip_address *totemip_b = (const struct totem_ip_address *)b;
struct in_addr ipv4_a1;
struct in_addr ipv4_a2;
struct in6_addr ipv6_a1;
struct in6_addr ipv6_a2;
unsigned short family;
/*
* Use memcpy to align since totem_ip_address is unaligned on various archs
*/
memcpy (&family, &totemip_a->family, sizeof (unsigned short));
if (family == AF_INET) {
memcpy (&ipv4_a1, totemip_a->addr, sizeof (struct in_addr));
memcpy (&ipv4_a2, totemip_b->addr, sizeof (struct in_addr));
if (ipv4_a1.s_addr == ipv4_a2.s_addr) {
return (0);
}
if (htonl(ipv4_a1.s_addr) < htonl(ipv4_a2.s_addr)) {
return -1;
} else {
return +1;
}
} else
if (family == AF_INET6) {
/*
* We can only compare 8 bits at time for portability reasons
*/
memcpy (&ipv6_a1, totemip_a->addr, sizeof (struct in6_addr));
memcpy (&ipv6_a2, totemip_b->addr, sizeof (struct in6_addr));
for (i = 0; i < 16; i++) {
int res = ipv6_a1.s6_addr[i] -
ipv6_a2.s6_addr[i];
if (res) {
return res;
}
}
return 0;
} else {
/*
* Family not set, should be!
*/
assert (0);
}
return 0;
}
/* Build a localhost totem_ip_address */
int totemip_localhost(int family, struct totem_ip_address *localhost)
{
const char *addr_text;
memset (localhost, 0, sizeof (struct totem_ip_address));
if (family == AF_INET) {
addr_text = LOCALHOST_IPV4;
if (inet_pton(family, addr_text, (char *)&localhost->nodeid) <= 0) {
return -1;
}
} else {
addr_text = LOCALHOST_IPV6;
}
if (inet_pton(family, addr_text, (char *)localhost->addr) <= 0)
return -1;
localhost->family = family;
return 0;
}
int totemip_localhost_check(const struct totem_ip_address *addr)
{
struct totem_ip_address localhost;
if (totemip_localhost(addr->family, &localhost))
return 0;
return totemip_equal(addr, &localhost);
}
const char *totemip_print(const struct totem_ip_address *addr)
{
static char buf[INET6_ADDRSTRLEN];
return (inet_ntop(addr->family, addr->addr, buf, sizeof(buf)));
}
/* Make a totem_ip_address into a usable sockaddr_storage */
int totemip_totemip_to_sockaddr_convert(struct totem_ip_address *ip_addr,
uint16_t port, struct sockaddr_storage *saddr, int *addrlen)
{
int ret = -1;
if (ip_addr->family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
memset(sin, 0, sizeof(struct sockaddr_in));
#if defined(COROSYNC_BSD) || defined(COROSYNC_DARWIN)
sin->sin_len = sizeof(struct sockaddr_in);
#endif
sin->sin_family = ip_addr->family;
sin->sin_port = ntohs(port);
memcpy(&sin->sin_addr, ip_addr->addr, sizeof(struct in_addr));
*addrlen = sizeof(struct sockaddr_in);
ret = 0;
}
if (ip_addr->family == AF_INET6) {
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)saddr;
memset(sin, 0, sizeof(struct sockaddr_in6));
#if defined(COROSYNC_BSD) || defined(COROSYNC_DARWIN)
sin->sin6_len = sizeof(struct sockaddr_in6);
#endif
sin->sin6_family = ip_addr->family;
sin->sin6_port = ntohs(port);
sin->sin6_scope_id = 2;
memcpy(&sin->sin6_addr, ip_addr->addr, sizeof(struct in6_addr));
*addrlen = sizeof(struct sockaddr_in6);
ret = 0;
}
return ret;
}
/* Converts an address string string into a totem_ip_address.
family can be AF_INET, AF_INET6 or 0 ("for "don't care")
*/
int totemip_parse(struct totem_ip_address *totemip, const char *addr, int family)
{
struct addrinfo *ainfo;
struct addrinfo ahints;
struct sockaddr_in *sa;
struct sockaddr_in6 *sa6;
int ret;
memset(&ahints, 0, sizeof(ahints));
ahints.ai_socktype = SOCK_DGRAM;
ahints.ai_protocol = IPPROTO_UDP;
ahints.ai_family = family;
/* Lookup the nodename address */
ret = getaddrinfo(addr, NULL, &ahints, &ainfo);
if (ret)
return -1;
sa = (struct sockaddr_in *)ainfo->ai_addr;
sa6 = (struct sockaddr_in6 *)ainfo->ai_addr;
totemip->family = ainfo->ai_family;
if (ainfo->ai_family == AF_INET)
memcpy(totemip->addr, &sa->sin_addr, sizeof(struct in_addr));
else
memcpy(totemip->addr, &sa6->sin6_addr, sizeof(struct in6_addr));
freeaddrinfo(ainfo);
return 0;
}
/* Make a sockaddr_* into a totem_ip_address */
int totemip_sockaddr_to_totemip_convert(const struct sockaddr_storage *saddr,
struct totem_ip_address *ip_addr)
{
int ret = -1;
ip_addr->family = saddr->ss_family;
ip_addr->nodeid = 0;
if (saddr->ss_family == AF_INET) {
const struct sockaddr_in *sin = (const struct sockaddr_in *)saddr;
memcpy(ip_addr->addr, &sin->sin_addr, sizeof(struct in_addr));
ret = 0;
}
if (saddr->ss_family == AF_INET6) {
const struct sockaddr_in6 *sin
= (const struct sockaddr_in6 *)saddr;
memcpy(ip_addr->addr, &sin->sin6_addr, sizeof(struct in6_addr));
ret = 0;
}
return ret;
}
#if defined(HAVE_GETIFADDRS)
int totemip_getifaddrs(struct list_head *addrs)
{
struct ifaddrs *ifap, *ifa;
struct totem_ip_if_address *if_addr;
if (getifaddrs(&ifap) != 0)
return (-1);
list_init(addrs);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL)
continue ;
if ((ifa->ifa_addr->sa_family != AF_INET && ifa->ifa_addr->sa_family != AF_INET6) ||
(ifa->ifa_netmask->sa_family != AF_INET && ifa->ifa_netmask->sa_family != AF_INET6))
continue ;
if_addr = malloc(sizeof(struct totem_ip_if_address));
if (if_addr == NULL) {
goto error_free_ifaddrs;
}
list_init(&if_addr->list);
memset(if_addr, 0, sizeof(struct totem_ip_if_address));
if_addr->interface_up = ifa->ifa_flags & IFF_UP;
if_addr->interface_num = if_nametoindex(ifa->ifa_name);
if_addr->name = strdup(ifa->ifa_name);
if (if_addr->name == NULL) {
goto error_free_addr;
}
if (totemip_sockaddr_to_totemip_convert((const struct sockaddr_storage *)ifa->ifa_addr,
&if_addr->ip_addr) == -1) {
goto error_free_addr_name;
}
if (totemip_sockaddr_to_totemip_convert((const struct sockaddr_storage *)ifa->ifa_netmask,
&if_addr->mask_addr) == -1) {
goto error_free_addr_name;
}
list_add(&if_addr->list, addrs);
}
freeifaddrs(ifap);
return (0);
error_free_addr_name:
free(if_addr->name);
error_free_addr:
free(if_addr);
error_free_ifaddrs:
totemip_freeifaddrs(addrs);
freeifaddrs(ifap);
return (-1);
}
#elif defined(SOLARIS)
/*
* On Solaris, man if_tcp describes this method
*/
int totemip_getifaddrs(struct list_head *addrs)
{
int id_fd;
int numreqs;
int res;
struct lifconf lifconf;
struct lifreq *lifreq;
int i, j;
struct totem_ip_if_address *if_addr;
short family;
list_init(addrs);
for (family = 0; family < 2; family++) {
numreqs = 0;
res = -1;
lifconf.lifc_family = (family == 0 ? AF_INET : AF_INET6);
id_fd = socket (lifconf.lifc_family, SOCK_STREAM, 0);
lifconf.lifc_flags = 0;
lifconf.lifc_buf = NULL;
lifconf.lifc_len = 0;
do {
numreqs += 32;
lifconf.lifc_len = sizeof (struct lifreq) * numreqs;
lifconf.lifc_buf = (void *)realloc(lifconf.lifc_buf, lifconf.lifc_len);
res = ioctl (id_fd, SIOCGLIFCONF, &lifconf);
if (res < 0) {
close (id_fd);
}
} while (res >= 0 && lifconf.lifc_len == sizeof (struct lifconf) * numreqs);
if (res < 0)
continue ;
lifreq = (struct lifreq *)lifconf.lifc_buf;
for (i = 0; i < lifconf.lifc_len / sizeof (struct lifreq); i++) {
if (ioctl(id_fd, SIOCGLIFADDR, &lifreq[i]) < 0)
continue ;
if (lifreq[i].lifr_addr.ss_family != AF_INET && lifreq[i].lifr_addr.ss_family != AF_INET6)
continue ;
if_addr = malloc(sizeof(struct totem_ip_if_address));
if (if_addr == NULL) {
goto error_free_ifaddrs;
}
memset(if_addr, 0, sizeof(struct totem_ip_if_address));
if_addr->name = strdup(lifreq[i].lifr_name);
if (if_addr->name == NULL) {
goto error_free_addr;
}
if (totemip_sockaddr_to_totemip_convert(&lifreq[i].lifr_addr, &if_addr->ip_addr) == -1) {
goto error_free_addr_name;
}
if (ioctl(id_fd, SIOCGLIFSUBNET, &lifreq[i]) < 0)
continue ;
/*
* lifreq doesn't contain mask address. But It length of prefix in bits,
* so we can generate mask.
*/
memset(&if_addr->mask_addr, 0, sizeof(if_addr->mask_addr));
if_addr->mask_addr.family = if_addr->ip_addr.family;
for (j = 0; j < lifreq[i].lifr_addrlen; j++) {
if_addr->mask_addr.addr[j / 8] |= 1 << (7 - (j % 8));
}
if (ioctl(id_fd, SIOCGLIFFLAGS, &lifreq[i]) >= 0) {
if_addr->interface_up = lifreq[i].lifr_flags & IFF_UP;
}
if (ioctl(id_fd, SIOCGLIFINDEX, &lifreq[i]) >= 0) {
if_addr->interface_num = lifreq[i].lifr_index;
}
list_add(&if_addr->list, addrs);
}
free (lifconf.lifc_buf);
close (id_fd);
}
return (0);
error_free_addr_name:
free(if_addr->name);
error_free_addr:
free(if_addr);
error_free_ifaddrs:
totemip_freeifaddrs(addrs);
free (lifconf.lifc_buf);
close (id_fd);
return (-1);
}
#endif /* HAVE_GETIFADDRS */
void totemip_freeifaddrs(struct list_head *addrs)
{
struct totem_ip_if_address *if_addr;
struct list_head *list;
for (list = addrs->next; list != addrs;) {
if_addr = list_entry(list, struct totem_ip_if_address, list);
list = list->next;
free(if_addr->name);
list_del(&if_addr->list);
free(if_addr);
}
list_init(addrs);
}
int totemip_iface_check(struct totem_ip_address *bindnet,
struct totem_ip_address *boundto,
int *interface_up,
int *interface_num,
int mask_high_bit)
{
struct list_head addrs;
struct list_head *list;
struct totem_ip_if_address *if_addr;
struct totem_ip_address bn_netaddr, if_netaddr;
socklen_t addr_len;
socklen_t si;
int res = -1;
*interface_up = 0;
*interface_num = 0;
if (totemip_getifaddrs(&addrs) == -1) {
return (-1);
}
for (list = addrs.next; list != &addrs; list = list->next) {
if_addr = list_entry(list, struct totem_ip_if_address, list);
if (bindnet->family != if_addr->ip_addr.family)
continue ;
addr_len = 0;
switch (bindnet->family) {
case AF_INET:
addr_len = sizeof(struct in_addr);
break;
case AF_INET6:
addr_len = sizeof(struct in6_addr);
break;
}
if (addr_len == 0)
continue ;
totemip_copy(&bn_netaddr, bindnet);
totemip_copy(&if_netaddr, &if_addr->ip_addr);
for (si = 0; si < addr_len; si++) {
bn_netaddr.addr[si] = bn_netaddr.addr[si] & if_addr->mask_addr.addr[si];
if_netaddr.addr[si] = if_netaddr.addr[si] & if_addr->mask_addr.addr[si];
}
if (totemip_equal(&bn_netaddr, &if_netaddr)) {
totemip_copy(boundto, &if_addr->ip_addr);
boundto->nodeid = bindnet->nodeid;
*interface_up = if_addr->interface_up;
*interface_num = if_addr->interface_num;
if (boundto->family == AF_INET && boundto->nodeid == 0) {
unsigned int nodeid = 0;
memcpy (&nodeid, boundto->addr, sizeof (int));
#if __BYTE_ORDER == __BIG_ENDIAN
nodeid = swab32 (nodeid);
#endif
if (mask_high_bit) {
nodeid &= 0x7FFFFFFF;
}
boundto->nodeid = nodeid;
}
res = 0;
goto finished;
}
}
finished:
totemip_freeifaddrs(&addrs);
return (res);
}

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