311 lines
7.8 KiB
C
311 lines
7.8 KiB
C
/*
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* Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id: get_addrs.c,v 1.35 1999/12/02 17:05:09 joda Exp $");
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#ifdef __osf__
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/* hate */
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struct rtentry;
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struct mbuf;
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif /* HAVE_SYS_SOCKIO_H */
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#ifdef HAVE_NETINET_IN6_VAR_H
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#include <netinet/in6_var.h>
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#endif /* HAVE_NETINET_IN6_VAR_H */
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static krb5_error_code
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gethostname_fallback (krb5_addresses *res)
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{
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krb5_error_code err;
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char hostname[MAXHOSTNAMELEN];
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struct hostent *hostent;
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if (gethostname (hostname, sizeof(hostname)))
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return errno;
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hostent = roken_gethostbyname (hostname);
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if (hostent == NULL)
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return errno;
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res->len = 1;
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res->val = malloc (sizeof(*res->val));
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if (res->val == NULL)
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return ENOMEM;
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res->val[0].addr_type = hostent->h_addrtype;
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res->val[0].address.data = NULL;
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res->val[0].address.length = 0;
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err = krb5_data_copy (&res->val[0].address,
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hostent->h_addr,
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hostent->h_length);
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if (err) {
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free (res->val);
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return err;
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}
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return 0;
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}
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enum {
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LOOP = 1, /* do include loopback interfaces */
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LOOP_IF_NONE = 2, /* include loopback if no other if's */
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EXTRA_ADDRESSES = 4, /* include extra addresses */
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SCAN_INTERFACES = 8 /* scan interfaces for addresses */
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};
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/*
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* Try to figure out the addresses of all configured interfaces with a
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* lot of magic ioctls.
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*/
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static krb5_error_code
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find_all_addresses (krb5_context context,
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krb5_addresses *res, int flags,
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int af, int siocgifconf, int siocgifflags,
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size_t ifreq_sz)
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{
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krb5_error_code ret;
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int fd;
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size_t buf_size;
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char *buf;
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struct ifconf ifconf;
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int num, j = 0;
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char *p;
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size_t sz;
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struct sockaddr sa_zero;
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struct ifreq *ifr;
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krb5_address lo_addr;
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int got_lo = FALSE;
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buf = NULL;
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res->val = NULL;
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memset (&sa_zero, 0, sizeof(sa_zero));
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fd = socket(af, SOCK_DGRAM, 0);
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if (fd < 0)
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return -1;
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buf_size = 8192;
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for (;;) {
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buf = malloc(buf_size);
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if (buf == NULL) {
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ret = ENOMEM;
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goto error_out;
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}
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ifconf.ifc_len = buf_size;
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ifconf.ifc_buf = buf;
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if (ioctl (fd, siocgifconf, &ifconf) < 0) {
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ret = errno;
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goto error_out;
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}
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/*
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* Can the difference between a full and a overfull buf
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* be determined?
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*/
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if (ifconf.ifc_len < buf_size)
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break;
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free (buf);
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buf_size *= 2;
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}
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num = ifconf.ifc_len / ifreq_sz;
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res->len = num;
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res->val = calloc(num, sizeof(*res->val));
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if (res->val == NULL) {
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ret = ENOMEM;
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goto error_out;
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}
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j = 0;
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for (p = ifconf.ifc_buf;
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p < ifconf.ifc_buf + ifconf.ifc_len;
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p += sz) {
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struct ifreq ifreq;
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struct sockaddr *sa;
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ifr = (struct ifreq *)p;
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sa = &ifr->ifr_addr;
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sz = ifreq_sz;
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#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
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sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
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#endif
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#ifdef SA_LEN
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sz = max(sz, SA_LEN(sa));
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#endif
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memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
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if (ioctl(fd, siocgifflags, &ifreq) < 0) {
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ret = errno;
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goto error_out;
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}
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if (!(ifreq.ifr_flags & IFF_UP))
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continue;
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if (memcmp (sa, &sa_zero, sizeof(sa_zero)) == 0)
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continue;
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if (krb5_sockaddr_uninteresting (sa))
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continue;
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if (ifreq.ifr_flags & IFF_LOOPBACK) {
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if (flags & LOOP_IF_NONE) {
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ret = krb5_sockaddr2address (sa, &lo_addr);
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if (ret)
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goto error_out;
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got_lo = TRUE;
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continue;
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} else if((flags & LOOP) == 0)
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continue;
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}
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ret = krb5_sockaddr2address (sa, &res->val[j]);
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if (ret)
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goto error_out;
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++j;
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}
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if ((flags & LOOP_IF_NONE) && got_lo) {
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if (j == 0)
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res->val[j++] = lo_addr;
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else
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krb5_free_address (context, &lo_addr);
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}
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if (j != num) {
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void *tmp;
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res->len = j;
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tmp = realloc (res->val, j * sizeof(*res->val));
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if (j != 0 && tmp == NULL) {
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ret = ENOMEM;
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goto error_out;
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}
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res->val = tmp;
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}
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ret = 0;
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goto cleanup;
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error_out:
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if (got_lo)
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krb5_free_address (context, &lo_addr);
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while(j--) {
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krb5_free_address (context, &res->val[j]);
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}
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free (res->val);
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cleanup:
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close (fd);
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free (buf);
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return ret;
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}
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static krb5_error_code
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get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
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{
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krb5_error_code ret = -1;
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if (flags & SCAN_INTERFACES) {
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#if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)
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if (ret)
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ret = find_all_addresses (context, res, flags,
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AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS,
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sizeof(struct in6_ifreq));
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#endif
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#if defined(HAVE_IPV6) && defined(SIOCGIFCONF)
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if (ret)
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ret = find_all_addresses (context, res, flags,
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AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS,
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sizeof(struct ifreq));
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#endif
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#if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)
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if (ret)
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ret = find_all_addresses (context, res, flags,
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AF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
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sizeof(struct ifreq));
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if(ret || res->len == 0)
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ret = gethostname_fallback (res);
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#endif
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} else
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ret = 0;
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if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
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/* append user specified addresses */
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krb5_addresses a;
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ret = krb5_get_extra_addresses(context, &a);
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if(ret) {
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krb5_free_addresses(context, res);
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return ret;
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}
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ret = krb5_append_addresses(context, res, &a);
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if(ret) {
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krb5_free_addresses(context, res);
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return ret;
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}
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krb5_free_addresses(context, &a);
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}
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return ret;
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}
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/*
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* Try to get all addresses, but return the one corresponding to
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* `hostname' if we fail.
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*
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* Only include loopback address if there are no other.
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*/
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krb5_error_code
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krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
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{
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int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
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if (context->scan_interfaces)
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flags |= SCAN_INTERFACES;
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return get_addrs_int (context, res, flags);
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}
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/*
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* Try to get all local addresses that a server should listen to.
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* If that fails, we return the address corresponding to `hostname'.
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*/
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krb5_error_code
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krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
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{
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return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);
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}
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