Annotation of embedaddon/dnsmasq/src/domain.c, revision 1.1
1.1 ! misho 1: /* dnsmasq is Copyright (c) 2000-2014 Simon Kelley
! 2:
! 3: This program is free software; you can redistribute it and/or modify
! 4: it under the terms of the GNU General Public License as published by
! 5: the Free Software Foundation; version 2 dated June, 1991, or
! 6: (at your option) version 3 dated 29 June, 2007.
! 7:
! 8: This program is distributed in the hope that it will be useful,
! 9: but WITHOUT ANY WARRANTY; without even the implied warranty of
! 10: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 11: GNU General Public License for more details.
! 12:
! 13: You should have received a copy of the GNU General Public License
! 14: along with this program. If not, see <http://www.gnu.org/licenses/>.
! 15: */
! 16:
! 17: #include "dnsmasq.h"
! 18:
! 19:
! 20: static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c);
! 21: #ifdef HAVE_IPV6
! 22: static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c);
! 23: #endif
! 24:
! 25:
! 26: int is_name_synthetic(int flags, char *name, struct all_addr *addr)
! 27: {
! 28: char *p;
! 29: struct cond_domain *c = NULL;
! 30: int prot = AF_INET;
! 31:
! 32: #ifdef HAVE_IPV6
! 33: if (flags & F_IPV6)
! 34: prot = AF_INET6;
! 35: #endif
! 36:
! 37: for (c = daemon->synth_domains; c; c = c->next)
! 38: {
! 39: int found = 0;
! 40: char *tail, *pref;
! 41:
! 42: for (tail = name, pref = c->prefix; *tail != 0 && pref && *pref != 0; tail++, pref++)
! 43: {
! 44: unsigned int c1 = (unsigned char) *pref;
! 45: unsigned int c2 = (unsigned char) *tail;
! 46:
! 47: if (c1 >= 'A' && c1 <= 'Z')
! 48: c1 += 'a' - 'A';
! 49: if (c2 >= 'A' && c2 <= 'Z')
! 50: c2 += 'a' - 'A';
! 51:
! 52: if (c1 != c2)
! 53: break;
! 54: }
! 55:
! 56: if (pref && *pref != 0)
! 57: continue; /* prefix match fail */
! 58:
! 59: /* NB, must not alter name if we return zero */
! 60: for (p = tail; *p; p++)
! 61: {
! 62: char c = *p;
! 63:
! 64: if ((c >='0' && c <= '9') || c == '-')
! 65: continue;
! 66:
! 67: #ifdef HAVE_IPV6
! 68: if (prot == AF_INET6 && ((c >='A' && c <= 'F') || (c >='a' && c <= 'f')))
! 69: continue;
! 70: #endif
! 71:
! 72: break;
! 73: }
! 74:
! 75: if (*p != '.')
! 76: continue;
! 77:
! 78: *p = 0;
! 79:
! 80: /* swap . or : for - */
! 81: for (p = tail; *p; p++)
! 82: if (*p == '-')
! 83: {
! 84: if (prot == AF_INET)
! 85: *p = '.';
! 86: #ifdef HAVE_IPV6
! 87: else
! 88: *p = ':';
! 89: #endif
! 90: }
! 91:
! 92: if (hostname_isequal(c->domain, p+1) && inet_pton(prot, tail, addr))
! 93: {
! 94: if (prot == AF_INET)
! 95: {
! 96: if (!c->is6 &&
! 97: ntohl(addr->addr.addr4.s_addr) >= ntohl(c->start.s_addr) &&
! 98: ntohl(addr->addr.addr4.s_addr) <= ntohl(c->end.s_addr))
! 99: found = 1;
! 100: }
! 101: #ifdef HAVE_IPV6
! 102: else
! 103: {
! 104: u64 addrpart = addr6part(&addr->addr.addr6);
! 105:
! 106: if (c->is6 &&
! 107: is_same_net6(&addr->addr.addr6, &c->start6, 64) &&
! 108: addrpart >= addr6part(&c->start6) &&
! 109: addrpart <= addr6part(&c->end6))
! 110: found = 1;
! 111: }
! 112: #endif
! 113: }
! 114:
! 115: /* restore name */
! 116: for (p = tail; *p; p++)
! 117: if (*p == '.' || *p == ':')
! 118: *p = '-';
! 119:
! 120: *p = '.';
! 121:
! 122: if (found)
! 123: return 1;
! 124: }
! 125:
! 126: return 0;
! 127: }
! 128:
! 129:
! 130: int is_rev_synth(int flag, struct all_addr *addr, char *name)
! 131: {
! 132: struct cond_domain *c;
! 133:
! 134: if (flag & F_IPV4 && (c = search_domain(addr->addr.addr4, daemon->synth_domains)))
! 135: {
! 136: char *p;
! 137:
! 138: *name = 0;
! 139: if (c->prefix)
! 140: strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
! 141:
! 142: inet_ntop(AF_INET, &addr->addr.addr4, name + strlen(name), ADDRSTRLEN);
! 143: for (p = name; *p; p++)
! 144: if (*p == '.')
! 145: *p = '-';
! 146:
! 147: strncat(name, ".", MAXDNAME);
! 148: strncat(name, c->domain, MAXDNAME);
! 149:
! 150: return 1;
! 151: }
! 152:
! 153: #ifdef HAVE_IPV6
! 154: if (flag & F_IPV6 && (c = search_domain6(&addr->addr.addr6, daemon->synth_domains)))
! 155: {
! 156: char *p;
! 157:
! 158: *name = 0;
! 159: if (c->prefix)
! 160: strncpy(name, c->prefix, MAXDNAME - ADDRSTRLEN);
! 161:
! 162: inet_ntop(AF_INET6, &addr->addr.addr6, name + strlen(name), ADDRSTRLEN);
! 163:
! 164: /* IPv6 presentation address can start with ":", but valid domain names
! 165: cannot start with "-" so prepend a zero in that case. */
! 166: if (!c->prefix && *name == ':')
! 167: {
! 168: *name = '0';
! 169: inet_ntop(AF_INET6, &addr->addr.addr6, name+1, ADDRSTRLEN);
! 170: }
! 171:
! 172: for (p = name; *p; p++)
! 173: if (*p == ':')
! 174: *p = '-';
! 175:
! 176: strncat(name, ".", MAXDNAME);
! 177: strncat(name, c->domain, MAXDNAME);
! 178:
! 179: return 1;
! 180: }
! 181: #endif
! 182:
! 183: return 0;
! 184: }
! 185:
! 186:
! 187: static struct cond_domain *search_domain(struct in_addr addr, struct cond_domain *c)
! 188: {
! 189: for (; c; c = c->next)
! 190: if (!c->is6 &&
! 191: ntohl(addr.s_addr) >= ntohl(c->start.s_addr) &&
! 192: ntohl(addr.s_addr) <= ntohl(c->end.s_addr))
! 193: return c;
! 194:
! 195: return NULL;
! 196: }
! 197:
! 198: char *get_domain(struct in_addr addr)
! 199: {
! 200: struct cond_domain *c;
! 201:
! 202: if ((c = search_domain(addr, daemon->cond_domain)))
! 203: return c->domain;
! 204:
! 205: return daemon->domain_suffix;
! 206: }
! 207:
! 208: #ifdef HAVE_IPV6
! 209: static struct cond_domain *search_domain6(struct in6_addr *addr, struct cond_domain *c)
! 210: {
! 211: u64 addrpart = addr6part(addr);
! 212:
! 213: for (; c; c = c->next)
! 214: if (c->is6 &&
! 215: is_same_net6(addr, &c->start6, 64) &&
! 216: addrpart >= addr6part(&c->start6) &&
! 217: addrpart <= addr6part(&c->end6))
! 218: return c;
! 219:
! 220: return NULL;
! 221: }
! 222:
! 223: char *get_domain6(struct in6_addr *addr)
! 224: {
! 225: struct cond_domain *c;
! 226:
! 227: if (addr && (c = search_domain6(addr, daemon->cond_domain)))
! 228: return c->domain;
! 229:
! 230: return daemon->domain_suffix;
! 231: }
! 232: #endif
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