diff options
Diffstat (limited to 'src/domain.c')
| -rw-r--r-- | src/domain.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/src/domain.c b/src/domain.c new file mode 100644 index 0000000..278698c --- /dev/null +++ b/src/domain.c @@ -0,0 +1,232 @@ +/* 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 |