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/* dnsmasq is Copyright (c) 2000-2015 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c);
#ifdef HAVE_IPV6
static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c);
#endif
int is_name_synthetic(int flags, char *name, struct all_addr *addr)
{
char *p;
struct cond_domain *c = NULL;
int prot = AF_INET;
#ifdef HAVE_IPV6
if (flags & F_IPV6)
prot = AF_INET6;
#endif
for (c = daemon->synth_domains; c; c = c->next)
{
int found = 0;
char *tail, *pref;
for (tail = name, pref = c->prefix; *tail != 0 && pref && *pref != 0; tail++, pref++)
{
unsigned int c1 = (unsigned char) *pref;
unsigned int c2 = (unsigned char) *tail;
if (c1 >= 'A' && c1 <= 'Z')
c1 += 'a' - 'A';
if (c2 >= 'A' && c2 <= 'Z')
c2 += 'a' - 'A';
if (c1 != c2)
break;
}
if (pref && *pref != 0)
continue; /* prefix match fail */
/* NB, must not alter name if we return zero */
for (p = tail; *p; p++)
{
char c = *p;
if ((c >='0' && c <= '9') || c == '-')
continue;
#ifdef HAVE_IPV6
if (prot == AF_INET6 && ((c >='A' && c <= 'F') || (c >='a' && c <= 'f')))
continue;
#endif
break;
}
if (*p != '.')
continue;
*p = 0;
/* swap . or : for - */
for (p = tail; *p; p++)
if (*p == '-')
{
if (prot == AF_INET)
*p = '.';
#ifdef HAVE_IPV6
else
*p = ':';
#endif
}
if (hostname_isequal(c->domain, p+1) && inet_pton(prot, tail, addr))
{
if (prot == AF_INET)
{
if (!c->is6 &&
ntohl(addr->addr.addr4.s_addr) >= ntohl(c->start.s_addr) &&
ntohl(addr->addr.addr4.s_addr) <= ntohl(c->end.s_addr))
found = 1;
}
#ifdef HAVE_IPV6
else
{
u64 addrpart = addr6part(&addr->addr.addr6);
if (c->is6 &&
is_same_net6(&addr->addr.addr6, &c->start6, 64) &&
addrpart >= addr6part(&c->start6) &&
addrpart <= addr6part(&c->end6))
found = 1;
}
#endif
}
/* restore name */
for (p = tail; *p; p++)
if (*p == '.' || *p == ':')
*p = '-';
*p = '.';
if (found)
return 1;
}
return 0;
}
int is_rev_synth(int flag, struct all_addr *addr, char *name)
{
struct cond_domain *c;
if (flag & F_IPV4 && (c = search_domain(addr->addr.addr4, daemon->synth_domains)))
{
char *p;
*name = 0;
if (c->prefix)
strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
inet_ntop(AF_INET, &addr->addr.addr4, name + strlen(name), ADDRSTRLEN);
for (p = name; *p; p++)
if (*p == '.')
*p = '-';
strncat(name, ".", MAXDNAME);
strncat(name, c->domain, MAXDNAME);
return 1;
}
#ifdef HAVE_IPV6
if (flag & F_IPV6 && (c = search_domain6(&addr->addr.addr6, daemon->synth_domains)))
{
char *p;
*name = 0;
if (c->prefix)
strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
inet_ntop(AF_INET6, &addr->addr.addr6, name + strlen(name), ADDRSTRLEN);
/* IPv6 presentation address can start with ":", but valid domain names
cannot start with "-" so prepend a zero in that case. */
if (!c->prefix && *name == ':')
{
*name = '0';
inet_ntop(AF_INET6, &addr->addr.addr6, name+1, ADDRSTRLEN);
}
for (p = name; *p; p++)
if (*p == ':')
*p = '-';
strncat(name, ".", MAXDNAME);
strncat(name, c->domain, MAXDNAME);
return 1;
}
#endif
return 0;
}
static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c)
{
for (; c; c = c->next)
if (!c->is6 &&
ntohl(addr.s_addr) >= ntohl(c->start.s_addr) &&
ntohl(addr.s_addr) <= ntohl(c->end.s_addr))
return c;
return NULL;
}
char *get_domain(struct in_addr addr)
{
struct cond_domain *c;
if ((c = search_domain(addr, daemon->cond_domain)))
return c->domain;
return daemon->domain_suffix;
}
#ifdef HAVE_IPV6
static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c)
{
u64 addrpart = addr6part(addr);
for (; c; c = c->next)
if (c->is6 &&
is_same_net6(addr, &c->start6, 64) &&
addrpart >= addr6part(&c->start6) &&
addrpart <= addr6part(&c->end6))
return c;
return NULL;
}
char *get_domain6(struct in6_addr *addr)
{
struct cond_domain *c;
if (addr && (c = search_domain6(addr, daemon->cond_domain)))
return c->domain;
return daemon->domain_suffix;
}
#endif
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