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/* darkstat 3
* copyright (c) 2001-2012 Emil Mikulic.
*
* localip.c: determine local IPs of an interface
*
* You may use, modify and redistribute this file under the terms of the
* GNU General Public License version 2. (see COPYING.GPL)
*/
#include "addr.h"
#include "bsd.h" /* for strlcpy */
#include "config.h" /* for HAVE_IFADDRS_H */
#include "conv.h"
#include "err.h"
#include "localip.h"
#include "now.h"
#include <sys/socket.h>
#include <net/if.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_IFADDRS_H
# include <ifaddrs.h>
#else
# ifdef HAVE_SYS_SOCKIO_H
# include <sys/sockio.h> /* for SIOCGIFADDR, especially on Solaris */
# endif
# include <sys/ioctl.h>
#endif
void localip_init(struct local_ips *ips) {
ips->is_valid = 0;
ips->last_update_mono = 0;
ips->num_addrs = 0;
ips->addrs = NULL;
}
void localip_free(struct local_ips *ips) {
if (ips->addrs != NULL)
free(ips->addrs);
}
static void add_ip(const char *iface,
struct local_ips *ips,
int *idx,
struct addr *a) {
if (ips->num_addrs <= *idx) {
/* Grow. */
ips->addrs = xrealloc(ips->addrs, sizeof(*(ips->addrs)) * (*idx + 1));
ips->num_addrs++;
assert(ips->num_addrs > *idx);
verbosef("interface '%s' gained new address %s", iface, addr_to_str(a));
} else {
/* Warn about changed address. */
if (!addr_equal(ips->addrs + *idx, a)) {
static char before[INET6_ADDRSTRLEN];
strncpy(before, addr_to_str(ips->addrs + *idx), INET6_ADDRSTRLEN);
verbosef("interface '%s' address %d/%d changed from %s to %s",
iface, *idx+1, ips->num_addrs, before, addr_to_str(a));
}
}
ips->addrs[*idx] = *a;
(*idx)++;
}
/* Returns 0 on failure. */
void localip_update(const char *iface, struct local_ips *ips) {
struct addr a;
int new_addrs = 0;
if (iface == NULL) {
/* reading from capfile */
ips->is_valid = 0;
return;
}
if (ips->last_update_mono == now_mono()) {
/* Too soon, bail out. */
return;
}
ips->last_update_mono = now_mono();
#ifdef HAVE_IFADDRS_H
{
struct ifaddrs *ifas, *ifa;
if (getifaddrs(&ifas) < 0)
err(1, "getifaddrs() failed");
for (ifa=ifas; ifa; ifa=ifa->ifa_next) {
if (strncmp(ifa->ifa_name, iface, IFNAMSIZ))
continue; /* Wrong interface. */
if (!ifa->ifa_addr)
continue; /* This can be NULL, e.g. for ppp0. */
if (ifa->ifa_addr->sa_family == AF_INET) {
a.family = IPv4;
a.ip.v4 = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
add_ip(iface, ips, &new_addrs, &a);
}
if (ifa->ifa_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)ifa->ifa_addr;
# if 0
if ( IN6_IS_ADDR_LINKLOCAL(&(sa6->sin6_addr))
|| IN6_IS_ADDR_SITELOCAL(&(sa6->sin6_addr)) )
continue;
# endif
a.family = IPv6;
memcpy(&(a.ip.v6), &sa6->sin6_addr, sizeof(a.ip.v6));
add_ip(iface, ips, &new_addrs, &a);
}
}
freeifaddrs(ifas);
}
#else /* don't HAVE_IFADDRS_H */
{
int tmp = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
struct ifreq ifr;
struct sockaddr sa;
strlcpy(ifr.ifr_name, iface, IFNAMSIZ);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(tmp, SIOCGIFADDR, &ifr) != -1) {
sa = ifr.ifr_addr;
a.family = IPv4;
a.ip.v4 = ((struct sockaddr_in*)(&ifr.ifr_addr))->sin_addr.s_addr;
add_ip(iface, ips, &new_addrs, &a);
}
close(tmp);
}
#endif
if (new_addrs == 0) {
if (ips->is_valid)
verbosef("interface '%s' no longer has any addresses", iface);
ips->is_valid = 0;
} else {
if (!ips->is_valid)
verbosef("interface '%s' now has addresses", iface);
ips->is_valid = 1;
if (ips->num_addrs != new_addrs)
verbosef("interface '%s' number of addresses decreased from %d to %d",
iface, ips->num_addrs, new_addrs);
ips->num_addrs = new_addrs;
}
}
int is_localip(const struct addr * const a,
const struct local_ips * const ips) {
int i;
for (i=0; i<ips->num_addrs; i++) {
if (addr_equal(a, ips->addrs+i))
return 1;
}
return 0;
}
/* vim:set ts=3 sw=3 tw=80 et: */
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