mdw@git.distorted.org.uk Git - yaid/blob - addr.c

   1 /* -*-c-*-
   2  *
   3  * Address-type specific functionality
   4  *
   5  * (c) 2012 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Yet Another Ident Daemon (YAID).
  11  *
  12  * YAID is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * YAID is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with YAID; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "yaid.h"
  30
  31 /*----- IPv4 addresses ----------------------------------------------------*/
  32
  33 static int addreq_ipv4(const union addr *a, const union addr *b)
  34   { return a->ipv4.s_addr == b->ipv4.s_addr; }
  35
  36 static int match_addrpat_ipv4(const struct addrpat *ap, const union addr *a)
  37 {
  38   unsigned m;
  39
  40   if (!ap->len) return (1);
  41   m = htonl((MASK32 << (32 - ap->len)) & MASK32);
  42   return (((ap->addr.ipv4.s_addr ^ a->ipv4.s_addr) & m) == 0);
  43 }
  44
  45 static void socket_to_sockaddr_ipv4(const struct socket *s,
  46                                     void *sa, size_t *ssz)
  47 {
  48   struct sockaddr_in *sin = sa;
  49
  50   sin->sin_family = AF_INET;
  51   sin->sin_addr = s->addr.ipv4;
  52   sin->sin_port = htons(s->port);
  53   *ssz = sizeof(*sin);
  54 }
  55
  56 static void sockaddr_to_addr_ipv4(const void *sa, union addr *a)
  57   { const struct sockaddr_in *sin = sa; a->ipv4 = sin->sin_addr; }
  58
  59 static int init_listen_socket_ipv4(int fd) { return (0); }
  60
  61 static const union addr any_ipv4 = { .ipv4.s_addr = INADDR_ANY };
  62
  63 /*----- IPv6 addresses ----------------------------------------------------*/
  64
  65 static int addreq_ipv6(const union addr *a, const union addr *b)
  66   { return !memcmp(a->ipv6.s6_addr, b->ipv6.s6_addr, 16); }
  67
  68 static int match_addrpat_ipv6(const struct addrpat *ap, const union addr *a)
  69 {
  70   unsigned i = 0, m, n = ap->len;
  71
  72   if (!n) return (1);
  73   for (i = 0; n >= 8; i++, n -= 8)
  74     if (ap->addr.ipv6.s6_addr[i] != a->ipv6.s6_addr[i]) return (0);
  75   if (!n) return (1);
  76   m = (MASK8 << (8 - n)) & MASK8;
  77   return (((ap->addr.ipv6.s6_addr[i] ^ a->ipv6.s6_addr[i]) & m) == 0);
  78 }
  79
  80 static void socket_to_sockaddr_ipv6(const struct socket *s,
  81                                     void *sa, size_t *ssz)
  82 {
  83   struct sockaddr_in6 *sin6 = sa;
  84
  85   sin6->sin6_family = AF_INET6;
  86   sin6->sin6_addr = s->addr.ipv6;
  87   sin6->sin6_port = htons(s->port);
  88   sin6->sin6_flowinfo = 0;
  89   sin6->sin6_scope_id = 0;
  90   *ssz = sizeof(*sin6);
  91 }
  92
  93 static void sockaddr_to_addr_ipv6(const void *sa, union addr *a)
  94   { const struct sockaddr_in6 *sin6 = sa; a->ipv6 = sin6->sin6_addr; }
  95
  96 static int init_listen_socket_ipv6(int fd)
  97 {
  98   int yes = 1;
  99
 100   if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)))
 101     return (-1);
 102   return (0);
 103 }
 104
 105 static const union addr any_ipv6 = { .ipv6 = IN6ADDR_ANY_INIT };
 106
 107 /*----- General utilities -------------------------------------------------*/
 108
 109 int sockeq(const struct addrops *ao,
 110            const struct socket *sa, const struct socket *sb)
 111   { return (ao->addreq(&sa->addr, &sb->addr) && sa->port == sb->port); }
 112
 113 void dputsock(dstr *d, const struct addrops *ao, const struct socket *s)
 114 {
 115   char buf[ADDRLEN];
 116
 117   inet_ntop(ao->af, &s->addr, buf, sizeof(buf));
 118   if (!s->port || ao->af != AF_INET6) dstr_puts(d, buf);
 119   else { dstr_putc(d, '['); dstr_puts(d, buf); dstr_putc(d, ']'); }
 120   if (s->port) dstr_putf(d, ":%d", s->port);
 121 }
 122
 123 /*----- The operations table ----------------------------------------------*/
 124
 125 const struct addrops addroptab[] = {
 126 #define DEFOPS(ty, TY, af, name, len)                                   \
 127   { AF_##af, name, len, &any_##ty, &addrops_sys_##ty,                   \
 128     addreq_##ty, match_addrpat_##ty,                                    \
 129     socket_to_sockaddr_##ty, sockaddr_to_addr_##ty,                     \
 130     init_listen_socket_##ty },
 131 ADDRTYPES(DEFOPS)
 132   { 0 }
 133 #undef DEFOPS
 134 };
 135
 136 /*----- That's all, folks -------------------------------------------------*/