#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_mib.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <err.h>
#include <ifaddrs.h>
#include <sysexits.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <ifaddrs.h>
#include "netstat.h"
union sockunion {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_dl sdl;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
typedef union sockunion sockunion_t;
#ifndef ifa_broadaddr
#define ifa_broadaddr ifa_dstaddr
#endif
struct ifmaddrs {
struct ifmaddrs *ifma_next;
struct sockaddr *ifma_name;
struct sockaddr *ifma_addr;
struct sockaddr *ifma_lladdr;
};
void ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af);
#define SALIGN (sizeof(uint32_t) - 1)
#define SA_RLEN(sa) (sa ? ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
(SALIGN + 1)) : 0)
#define MAX_SYSCTL_TRY 5
#define RTA_MASKS (RTA_GATEWAY | RTA_IFP | RTA_IFA)
int getifmaddrs(struct ifmaddrs **);
void freeifmaddrs(struct ifmaddrs *);
int
getifmaddrs(struct ifmaddrs **pif)
{
int icnt = 1;
int dcnt = 0;
int ntry = 0;
size_t len;
size_t needed;
int mib[6];
int i;
char *buf;
char *data;
char *next;
char *p;
struct ifma_msghdr2 *ifmam;
struct ifmaddrs *ifa, *ift;
struct rt_msghdr *rtm;
struct sockaddr *sa;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_IFLIST2;
mib[5] = 0;
do {
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
return (-1);
if ((buf = malloc(needed)) == NULL)
return (-1);
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
free(buf);
return (-1);
}
free(buf);
buf = NULL;
}
} while (buf == NULL);
for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)(void *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
switch (rtm->rtm_type) {
case RTM_NEWMADDR2:
ifmam = (struct ifma_msghdr2 *)(void *)rtm;
if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
break;
icnt++;
p = (char *)(ifmam + 1);
for (i = 0; i < RTAX_MAX; i++) {
if ((RTA_MASKS & ifmam->ifmam_addrs &
(1 << i)) == 0)
continue;
sa = (struct sockaddr *)(void *)p;
len = SA_RLEN(sa);
dcnt += len;
p += len;
}
break;
}
}
data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
if (data == NULL) {
free(buf);
return (-1);
}
ifa = (struct ifmaddrs *)(void *)data;
data += sizeof(struct ifmaddrs) * icnt;
memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
ift = ifa;
for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)(void *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
switch (rtm->rtm_type) {
case RTM_NEWMADDR2:
ifmam = (struct ifma_msghdr2 *)(void *)rtm;
if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
break;
p = (char *)(ifmam + 1);
for (i = 0; i < RTAX_MAX; i++) {
if ((RTA_MASKS & ifmam->ifmam_addrs &
(1 << i)) == 0)
continue;
sa = (struct sockaddr *)(void *)p;
len = SA_RLEN(sa);
switch (i) {
case RTAX_GATEWAY:
ift->ifma_lladdr =
(struct sockaddr *)(void *)data;
memcpy(data, p, len);
data += len;
break;
case RTAX_IFP:
ift->ifma_name =
(struct sockaddr *)(void *)data;
memcpy(data, p, len);
data += len;
break;
case RTAX_IFA:
ift->ifma_addr =
(struct sockaddr *)(void *)data;
memcpy(data, p, len);
data += len;
break;
default:
data += len;
break;
}
p += len;
}
ift->ifma_next = ift + 1;
ift = ift->ifma_next;
break;
}
}
free(buf);
if (ift > ifa) {
ift--;
ift->ifma_next = NULL;
*pif = ifa;
} else {
*pif = NULL;
free(ifa);
}
return (0);
}
void
freeifmaddrs(struct ifmaddrs *ifmp)
{
free(ifmp);
}
void
ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af)
{
const struct ifmaddrs *ifma;
sockunion_t *psa;
char myifname[IFNAMSIZ];
#ifdef INET6
char addrbuf[INET6_ADDRSTRLEN];
#endif
char *pcolon;
char *pafname, *pifname, *plladdr = NULL, *pgroup = NULL;
#ifdef INET6
void *in6addr;
#endif
switch (af) {
case AF_INET:
pafname = "IPv4";
break;
#ifdef INET6
case AF_INET6:
pafname = "IPv6";
break;
#endif
case AF_LINK:
pafname = "Link-layer";
break;
default:
return;
}
fprintf(stdout, "%s Multicast Group Memberships\n", pafname);
fprintf(stdout, "%-20s\t%-16s\t%s\n", "Group", "Link-layer Address",
"Netif");
for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
continue;
psa = (sockunion_t *)ifma->ifma_addr;
if (psa->sa.sa_family != af)
continue;
switch (psa->sa.sa_family) {
case AF_INET:
pgroup = inet_ntoa(psa->sin.sin_addr);
break;
#ifdef INET6
case AF_INET6:
in6addr = &psa->sin6.sin6_addr;
inet_ntop(psa->sa.sa_family, in6addr, addrbuf,
sizeof(addrbuf));
pgroup = addrbuf;
break;
#endif
case AF_LINK:
if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
(psa->sdl.sdl_type == IFT_ETHER)) {
pgroup =
ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
#ifdef notyet
} else {
pgroup = addr2ascii(AF_LINK,
&psa->sdl,
sizeof(struct sockaddr_dl),
addrbuf);
#endif
}
break;
default:
continue;
}
psa = (sockunion_t *)ifma->ifma_lladdr;
if (psa != NULL) {
if (psa->sa.sa_family == AF_LINK) {
if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
(psa->sdl.sdl_type == IFT_ETHER)) {
plladdr =
ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
#ifdef notyet
} else {
plladdr = addr2ascii(AF_LINK,
&psa->sdl,
sizeof(struct sockaddr_dl),
addrbuf);
#endif
}
} else {
int i;
plladdr = "<invalid>";
for (i = 0; psa->sa.sa_len > 2 && i < psa->sa.sa_len - 2; i++)
printf("0x%x ", psa->sa.sa_data[i]);
printf("\n");
}
} else {
plladdr = "<none>";
}
psa = (sockunion_t *)ifma->ifma_name;
if (psa != NULL && psa->sa.sa_family == AF_LINK) {
strlcpy(myifname, link_ntoa(&psa->sdl), IFNAMSIZ);
pcolon = strchr(myifname, ':');
if (pcolon)
*pcolon = '\0';
pifname = myifname;
} else {
pifname = "";
}
fprintf(stdout, "%-20s\t%-16s\t%s\n", pgroup, plladdr, pifname);
}
}
void
ifmalist_dump(void)
{
struct ifmaddrs *ifmap;
if (getifmaddrs(&ifmap))
err(EX_OSERR, "getifmaddrs");
ifmalist_dump_af(ifmap, AF_LINK);
fputs("\n", stdout);
ifmalist_dump_af(ifmap, AF_INET);
#ifdef INET6
fputs("\n", stdout);
ifmalist_dump_af(ifmap, AF_INET6);
#endif
freeifmaddrs(ifmap);
}