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Treat all interface aliases as local addresses.

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The new rtiparse() function should really be in libc IMHO.... I'm
sick of writing this code :-(

PR:	20381
This commit is contained in:
Brian Somers 2000-08-09 09:24:31 +00:00
parent 3ebdf3366d
commit 7bdb026118
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=64450
1 changed files with 40 additions and 15 deletions
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55
usr.sbin/portmap/from_local.c
View file

@ -63,6 +63,7 @@ static const char rcsid[] =
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include "pmap_check.h"
@ -72,12 +73,31 @@ static const char rcsid[] =
#define FALSE 0
#endif
#define ROUNDUP(x) ((x) ? (1 + (((x) - 1) | (sizeof(long) - 1))) : sizeof(long))
/* How many interfaces could there be on a computer? */
#define ESTIMATED_LOCAL 20
static int num_local = -1;
static struct in_addr *addrs;
static void
rtiparse(struct ifa_msghdr *ifam, struct rt_addrinfo *ai)
{
char *wp;
int rtax;
wp = (char *)(ifam + 1);
ai->rti_addrs = ifam->ifam_addrs;
for (rtax = 0; rtax < sizeof ai->rti_info / sizeof *ai->rti_info; rtax++)
if (ifam->ifam_addrs & (1 << rtax)) {
ai->rti_info[rtax] = (struct sockaddr *)wp;
wp += ROUNDUP(ai->rti_info[rtax]->sa_len);
} else
ai->rti_info[rtax] = NULL;
}
/* find_local - find all IP addresses for this host */
static int
@ -87,6 +107,8 @@ find_local()
size_t needed;
char *buf, *end, *ptr;
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
struct rt_addrinfo ai;
struct ifreq ifr;
struct sockaddr_dl *dl;
@ -129,7 +151,7 @@ find_local()
dl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_index != dl->sdl_index || dl->sdl_nlen == 0)
/* We only want to see each interface once */
/* Skip over remaining ifa_msghdrs */
continue;
n = dl->sdl_nlen > sizeof ifr.ifr_name ?
@ -143,23 +165,26 @@ find_local()
fprintf(stderr, "%.*s: SIOCGIFFLAGS: %s\n", n, ifr.ifr_name,
strerror(errno));
else if (ifr.ifr_flags & IFF_UP) { /* active interface */
if (ioctl(s, SIOCGIFADDR, &ifr) < 0)
fprintf(stderr, "%.*s: SIOCGIFADDR: %s\n", n, ifr.ifr_name,
strerror(errno));
else {
if (alloced < num_local + 1) {
alloced += ESTIMATED_LOCAL;
if (addrs)
ifam = (struct ifa_msghdr *)(ptr + ifm->ifm_msglen);
while ((char *)ifam < end && ifam->ifam_type == RTM_NEWADDR) {
rtiparse(ifam, &ai);
if (ai.rti_info[RTAX_IFA] != NULL &&
ai.rti_info[RTAX_IFA]->sa_family == AF_INET) {
if (alloced < num_local + 1) {
alloced += ESTIMATED_LOCAL;
addrs = (struct in_addr *)realloc(addrs, alloced * sizeof addrs[0]);
else
addrs = (struct in_addr *)malloc(alloced * sizeof addrs[0]);
if (addrs == NULL) {
perror("malloc/realloc");
num_local = 0;
break;
if (addrs == NULL) {
perror("malloc/realloc");
num_local = 0;
break;
}
}
addrs[num_local++] = ((struct sockaddr_in *)
ai.rti_info[RTAX_IFA])->sin_addr;
}
addrs[num_local++] = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen);
}
}
}