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/*
* System dependent stuff
*
* Copyright (C) 2007 Olaf Kirch <olaf.kirch@oracle.com>
*/
#include <net/if.h>
#include <sys/ioctl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <libisns/isns.h>
#include <libisns/util.h>
int isns_get_nr_portals(void)
{
char buffer[8192], *end, *ptr;
struct ifconf ifc;
unsigned int nportals = 0;
int fd = -1;
if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
isns_error("%s: no socket - %m\n", __FUNCTION__);
return 0;
}
ifc.ifc_buf = buffer;
ifc.ifc_len = sizeof(buffer);
if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
isns_error("ioctl(SIOCGIFCONF): %m\n");
goto out;
}
ptr = buffer;
end = buffer + ifc.ifc_len;
while (ptr < end) {
struct ifreq ifr;
struct sockaddr_storage ifaddr;
int ifflags;
memcpy(&ifr, ptr, sizeof(ifr));
ptr += sizeof(ifr);
/* Get the interface addr */
memcpy(&ifaddr, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
isns_error("ioctl(%s, SIOCGIFFLAGS): %m\n",
ifr.ifr_name);
continue;
}
ifflags = ifr.ifr_flags;
if ((ifflags & IFF_UP) == 0)
continue;
if ((ifflags & IFF_LOOPBACK) != 0)
continue;
if (ifaddr.ss_family == AF_INET6 || ifaddr.ss_family == AF_INET)
nportals++;
}
out:
if (fd >= 0)
close(fd);
return nportals;
}
int
isns_enumerate_portals(isns_portal_info_t *result, unsigned int max)
{
char buffer[8192], *end, *ptr;
struct ifconf ifc;
unsigned int nportals = 0;
int fd = -1;
if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
isns_error("%s: no socket - %m\n", __FUNCTION__);
return 0;
}
ifc.ifc_buf = buffer;
ifc.ifc_len = sizeof(buffer);
if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
isns_error("ioctl(SIOCGIFCONF): %m\n");
goto out;
}
ptr = buffer;
end = buffer + ifc.ifc_len;
while (ptr < end) {
struct ifreq ifr;
struct sockaddr_storage ifaddr;
isns_portal_info_t portal;
int ifflags;
memcpy(&ifr, ptr, sizeof(ifr));
ptr += sizeof(ifr);
/* Get the interface addr */
memcpy(&ifaddr, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
isns_error("ioctl(%s, SIOCGIFFLAGS): %m\n",
ifr.ifr_name);
continue;
}
ifflags = ifr.ifr_flags;
if ((ifflags & IFF_UP) == 0)
continue;
if ((ifflags & IFF_LOOPBACK) != 0)
continue;
if (!isns_portal_from_sockaddr(&portal, &ifaddr))
continue;
isns_debug_socket("Got interface %u: %s %s\n",
nportals, ifr.ifr_name,
isns_portal_string(&portal));
if (nportals < max)
result[nportals++] = portal;
}
out:
if (fd >= 0)
close(fd);
return nportals;
}
int
isns_portal_from_sockaddr(isns_portal_info_t *portal,
const struct sockaddr_storage *addr)
{
struct sockaddr_in6 *six;
struct sockaddr_in *sin;
memset(portal, 0, sizeof(*portal));
/* May have to convert AF_INET to AF_INET6 */
six = &portal->addr;
switch (addr->ss_family) {
case AF_INET6:
memcpy(six, addr, sizeof(*six));
break;
case AF_INET:
sin = (struct sockaddr_in *) addr;
six->sin6_family = AF_INET6;
six->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
six->sin6_port = sin->sin_port;
break;
default:
isns_error("internal error: unknown address family (%d)\n",
addr->ss_family);
return 0;
}
return 1;
}
int
isns_portal_to_sockaddr(const isns_portal_info_t *portal,
struct sockaddr_storage *addr)
{
const struct sockaddr_in6 *six = &portal->addr;
struct sockaddr_in *sin;
/* Check if this is really a v4 address is disguise.
* If so, explicitly use an AF_INET socket - the
* stack may not support IPv6.
*/
if (IN6_IS_ADDR_V4MAPPED(&six->sin6_addr)
|| IN6_IS_ADDR_V4COMPAT(&six->sin6_addr)) {
sin = (struct sockaddr_in *) addr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = six->sin6_addr.s6_addr32[3];
sin->sin_port = six->sin6_port;
return sizeof(*sin);
}
/* This is the genuine article */
memcpy(addr, six, sizeof(*six));
return sizeof(*six);
}
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