d7827cfb24
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@874 ec53bebd-3082-4978-b11e-865c3cabbd6b
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
#include "krb5_locl.h"
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#include "krb5_error.h"
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static int
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send_and_recv (int fd,
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struct sockaddr_in *addr,
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const krb5_data *send,
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krb5_data *recv)
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{
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struct fd_set fdset;
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struct timeval timeout;
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int ret;
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int nbytes;
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if (sendto (fd, send->data, send->length, 0,
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(struct sockaddr *)addr, sizeof(*addr)) < 0)
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return -1;
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FD_ZERO(&fdset);
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FD_SET(fd, &fdset);
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timeout.tv_sec = 3;
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timeout.tv_usec = 0;
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ret = select (fd + 1, &fdset, NULL, NULL, &timeout);
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if (ret <= 0)
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return -1;
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else {
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int len;
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if (ioctl (fd, FIONREAD, &nbytes) < 0)
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return -1;
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recv->data = malloc (nbytes);
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ret = recvfrom (fd, recv->data, nbytes, 0, NULL, &len);
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if (ret < 0) {
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free (recv->data);
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return -1;
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}
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recv->data = realloc (recv->data, ret);
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recv->length = ret;
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return 0;
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}
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}
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krb5_error_code
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krb5_sendto_kdc (krb5_context context,
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const krb5_data *send,
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const krb5_data *realm,
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krb5_data *receive)
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{
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krb5_error_code err;
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char **hostlist, **hp, *p;
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struct hostent *hostent;
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int fd;
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int port;
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int i;
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port = krb5_getportbyname ("kerberos", "udp", htons(88));
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fd = socket (AF_INET, SOCK_DGRAM, 0);
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if (fd < 0) {
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krb5_free_krbhst (context, hostlist);
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return errno;
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}
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err = krb5_get_krbhst (context, realm, &hostlist);
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if (err) {
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close (fd);
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return err;
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}
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for (i = 0; i < 3; ++i)
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for (hp = hostlist; (p = *hp); ++hp) {
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char *addr;
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char *colon;
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colon = strchr (p, ':');
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if (colon)
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*colon = '\0';
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hostent = gethostbyname (p);
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if (colon)
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*colon++ = ':';
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while ((addr = *hostent->h_addr_list++)) {
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struct sockaddr_in a;
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memset (&a, 0, sizeof(a));
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a.sin_family = AF_INET;
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if (colon) {
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int tmp;
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sscanf (colon, "%d", &tmp);
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a.sin_port = htons(tmp);
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} else
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a.sin_port = port;
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a.sin_addr = *((struct in_addr *)addr);
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if (send_and_recv (fd, &a, send, receive) == 0) {
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close (fd);
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krb5_free_krbhst (context, hostlist);
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return 0;
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}
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}
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}
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close (fd);
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krb5_free_krbhst (context, hostlist);
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return KRB5_KDC_UNREACH;
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}
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