e2475934ac
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@302 ec53bebd-3082-4978-b11e-865c3cabbd6b
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
#include "krb5_locl.h"
|
|
#include "krb5_error.h"
|
|
|
|
static int
|
|
send_and_recv (int fd,
|
|
struct sockaddr_in *addr,
|
|
const krb5_data *send,
|
|
krb5_data *recv)
|
|
{
|
|
struct fd_set fdset;
|
|
struct timeval timeout;
|
|
int ret;
|
|
long nbytes;
|
|
|
|
if (sendto (fd, send->data, send->length, 0,
|
|
(struct sockaddr *)addr, sizeof(*addr)) < 0)
|
|
return -1;
|
|
FD_ZERO(&fdset);
|
|
FD_SET(fd, &fdset);
|
|
timeout.tv_sec = 3;
|
|
timeout.tv_usec = 0;
|
|
ret = select (fd + 1, &fdset, NULL, NULL, &timeout);
|
|
if (ret <= 0)
|
|
return -1;
|
|
else {
|
|
int len;
|
|
|
|
if (ioctl (fd, FIONREAD, &nbytes) < 0)
|
|
return -1;
|
|
|
|
recv->data = malloc (nbytes);
|
|
ret = recvfrom (fd, recv->data, nbytes, 0, NULL, &len);
|
|
if (ret < 0) {
|
|
free (recv->data);
|
|
return -1;
|
|
}
|
|
recv->data = realloc (recv->data, ret);
|
|
recv->length = ret;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_sendto_kdc (krb5_context context,
|
|
const krb5_data *send,
|
|
const krb5_data *realm,
|
|
krb5_data *receive)
|
|
{
|
|
krb5_error_code err;
|
|
char **hostlist, **hp, *p;
|
|
struct hostent *hostent;
|
|
int fd;
|
|
int port;
|
|
int i;
|
|
|
|
port = krb5_getportbyname ("kerberos", "udp", htons(88));
|
|
fd = socket (AF_INET, SOCK_DGRAM, 0);
|
|
if (fd < 0) {
|
|
krb5_free_krbhst (context, hostlist);
|
|
return errno;
|
|
}
|
|
|
|
err = krb5_get_krbhst (context, realm, &hostlist);
|
|
if (err) {
|
|
close (fd);
|
|
return err;
|
|
}
|
|
|
|
for (i = 0; i < 3; ++i)
|
|
for (hp = hostlist; p = *hp; ++hp) {
|
|
char *addr;
|
|
char *colon;
|
|
|
|
colon = strchr (p, ':');
|
|
if (colon)
|
|
*colon = '\0';
|
|
hostent = gethostbyname (p);
|
|
if (colon)
|
|
*colon++ = ':';
|
|
while (addr = *hostent->h_addr_list++) {
|
|
struct sockaddr_in a;
|
|
|
|
memset (&a, 0, sizeof(a));
|
|
a.sin_family = AF_INET;
|
|
if (colon) {
|
|
int tmp;
|
|
|
|
sscanf (colon, "%d", &tmp);
|
|
a.sin_port = htons(tmp);
|
|
} else
|
|
a.sin_port = port;
|
|
a.sin_addr = *((struct in_addr *)addr);
|
|
|
|
if (send_and_recv (fd, &a, send, receive) == 0) {
|
|
close (fd);
|
|
krb5_free_krbhst (context, hostlist);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
close (fd);
|
|
krb5_free_krbhst (context, hostlist);
|
|
return KRB5_KDC_UNREACH;
|
|
}
|