[adns] / src / addrfam.c

/*
 * addrfam.c
 * - address-family specific code
 */
/*
 *  This file is part of adns, which is
 *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
 *    Copyright (C) 1999-2000,2003,2006  Tony Finch
 *    Copyright (C) 1991 Massachusetts Institute of Technology
 *  (See the file INSTALL for full details.)
 *  
 *  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; either version 2, or (at your option)
 *  any later version.
 *  
 *  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, write to the Free Software Foundation,
 *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
 */

#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>

#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "internal.h"

/*
 * General address-family operations.
 */

#define SIN(sa) ((struct sockaddr_in *)(sa))
#define CSIN(sa) ((const struct sockaddr_in *)(sa))

#define SIN6(sa) ((struct sockaddr_in6 *)(sa))
#define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))

/* This gadget (thanks, Richard Kettlewell) makes sure that we handle the
 * same set of address families in each switch. */
#define AF_CASES(pre)							\
  case AF_INET: goto pre##_inet;					\
  case AF_INET6: goto pre##_inet6

static void unknown_af(int af) {
  fprintf(stderr, "ADNS INTERNAL: unknown address family %d\n", af);
  abort();
}

int adns__af_supported_p(int af)
{
  switch (af) {
    AF_CASES(af);
    af_inet: af_inet6: return 1;
    default: return 0;
  }
}

int adns__sockaddr_equal_p(const struct sockaddr *sa,
			   const struct sockaddr *sb)
{
  if (sa->sa_family != sb->sa_family) return 0;
  switch (sa->sa_family) {
    AF_CASES(af);
    af_inet: {
      const struct sockaddr_in *sina = CSIN(sa), *sinb = CSIN(sb);
      return (sina->sin_addr.s_addr == sinb->sin_addr.s_addr &&
	      sina->sin_port == sinb->sin_port);
    }
    af_inet6: {
      /* Don't check the flowlabel.  That's apparently useful for routing
       * performance, but doesn't affect the address in any important
       * respect.
       */
      const struct sockaddr_in6 *sin6a = CSIN6(sa), *sin6b = CSIN6(sb);
      return (memcmp(sin6a->sin6_addr.s6_addr,
		     sin6b->sin6_addr.s6_addr,
		     sizeof(sin6a->sin6_addr.s6_addr)) == 0 &&
	      sin6a->sin6_port == sin6b->sin6_port &&
	      sin6a->sin6_scope_id == sin6b->sin6_scope_id);
    }
    default:
      unknown_af(sa->sa_family);
      return -1;
  }
}

int adns__gen_pton(const char *p, int *af_r, union gen_addr *addr_r)
{
  static const int aflist[] = { AF_INET6, AF_INET };
  int i, rc;

  for (i = 0; i < sizeof(aflist)/sizeof(*aflist); i++) {
    rc = inet_pton(aflist[i], p, addr_r);
    assert(rc >= 0);
    if (rc) { *af_r = aflist[i]; return 1; }
  }
  return 0;
}

int adns__addr_width(int af)
{
  switch (af) {
    AF_CASES(af);
    af_inet: return 32;
    af_inet6: return 128;
    default: unknown_af(af); return -1;
  }
}

void adns__prefix_mask(int af, int len, union gen_addr *mask_r)
{
  switch (af) {
    AF_CASES(af);
    af_inet:
      assert(len <= 32);
      mask_r->v4.s_addr = htonl(!len ? 0 : 0xffffffff << (32 - len));
      break;
    af_inet6: {
      int i = len/8, j = len%8;
      unsigned char *m = mask_r->v6.s6_addr;

      assert(len <= 128);
      memset(m, 0xff, i);
      if (j) m[i++] = (0xff << (8-j)) & 0xff;
      memset(m+i, 0, 16-i);
    } break;
    default:
      unknown_af(af);
      break;
  }
}

int adns__guess_prefix_length(int af, const union gen_addr *addr)
{
  switch (af) {
    AF_CASES(af);
    af_inet: {
      unsigned a = (ntohl(addr->v4.s_addr) >> 24) & 0xff;

      if (a < 128) return 8;
      else if (a < 192) return 16;
      else if (a < 224) return 24;
      else return -1;
    } break;
    af_inet6:
      return 64;
    default:
      unknown_af(af);
      return -1;
  }
}

int adns__addr_match_p(int addraf, const union gen_addr *addr,
		       int netaf, const union gen_addr *base,
		       const union gen_addr *mask)
{
  if (addraf != netaf) return 0;
  switch (addraf) {
    AF_CASES(af);
    af_inet:
      return (addr->v4.s_addr & mask->v4.s_addr) == base->v4.s_addr;
    af_inet6: {
      int i;
      const char *a = addr->v6.s6_addr;
      const char *b = base->v6.s6_addr;
      const char *m = mask->v6.s6_addr;

      for (i = 0; i < 16; i++)
	if ((a[i] & m[i]) != b[i]) return 0;
      return 1;
    } break;
    default:
      unknown_af(addraf);
      return -1;
  }
}

const void *adns__sockaddr_to_inaddr(const struct sockaddr *sa)
{
  switch (sa->sa_family) {
    AF_CASES(af);
    af_inet: return &CSIN(sa)->sin_addr;
    af_inet6: return &CSIN6(sa)->sin6_addr;
    default: unknown_af(sa->sa_family); return 0;
  }
}

/*
 * addr2text and text2addr
 */

int adns__addr2text(adns_state ads /* 0 ok */, adns_query qu /* 0 ok */,
		   const struct sockaddr *sa,
		   char *addr_buffer, int *addr_buflen,
		   int *port_r) {
  void *src;
  int port;

  if (*addr_buflen < ADNS_ADDR2TEXT_BUFLEN) {
    *addr_buflen = ADNS_ADDR2TEXT_BUFLEN;
    return ENOSPC;
  }

  switch (sa->sa_family) {
    AF_CASES(af);
    af_inet:  src= &CSIN(sa)->sin_addr;    port= SIN(sa)->sin_port;    break;
    af_inet6: src= &CSIN6(sa)->sin6_addr;  port= SIN6(sa)->sin6_port;  break;
    default: return EAFNOSUPPORT;
  }

  const char *ok= inet_ntop(sa->sa_family, src, addr_buffer, *addr_buflen);
  assert(ok);

  if (sa->sa_family == AF_INET6) {
    uint32_t scope = CSIN6(sa)->sin6_scope_id;
    if (scope) {
      scope = ntohl(scope);
      int scopeoffset = strlen(addr_buffer);
      int remain = *addr_buflen - scopeoffset,
      int r = snprintf(addr_buffer + scopeoffset, remain,
		       "%%%"PRIu32"", scope);
      assert(r < *addr_buflen - scopeoffset);
      adns__debug(ads,-1,qu, "addr2text: converted scoped address %s",
		  addr_buffer);
    }
  }

  if (port_r) *port_r= ntohs(port);
  return 0;
}

int adns_addr2text(adns_state ads,
		   const struct sockaddr *sa,
		   char *addr_buffer, int *addr_buflen /* set iff ENOSPC */,
		   int *port_r) {
  return adns__addr2text(ads,0, sa,addr_buffer,addr_buflen,port_r);
}

static void text2addr_einval(adns_state ads, adns_query qu,
			     const char *addr, const char *problem) {
  if (!ads)
  char dumpbuf[ADNS_ADDR2TEXT_BUFLEN * 4];
  
}

int adns__text2addr(adns_state ads /* 0 ok */, adns_query qu /* 0 ok */,
		   const char *addr, uint16_t port, struct sockaddr *sa,
		   socklen_t *salen /* set if OK or ENOSPC */) {
  int af;
  char copybuf[INET6_ADDRSTRLEN];
  char *parse;

  if (strchr(addr, ":")) {

    af= AF_INET6;

    const char *percent= strchr(addr, "%");
    if (percent) {
      ptrdiff_t lhslen = percent - addr;
      if (lhslen >= INET6_ADDRSTRLEN) {
	adns__debug(ads,-1,qu, "text2addr: scoped addr lhs too long
	return EINVAL;
      }
      memcpy(copy

int adns_text2addr(adns_state ads /* may be 0!  used for debug log only */,
		   const char *addr, int port, struct sockaddr *sa,
		   socklen_t *salen /* set if OK or ENOSPC */);


  assert(*addr_buflen > INET_ADDRSTRLEN && *addr_buflen > INET6_ADDRSTRLEN);
  switch (sa->sa_family) {
    AF_CASES(af);
    af_inet:  dst= &CSIN(sa)->sin_addr;    port= CSIN(sa)->sin_port;    break;
    af_inet6: dst= &CSIN6(sa)->sin6_addr;  port= CSIN6(sa)->sin6_port;  break;
    default: return EAFNOSUPPORT;
  }

  inet_pton(sa->sa_family, 
      const struct sockaddr *sin = 
      
    
/*
 * Reverse-domain parsing and construction.
 */

int adns__make_reverse_domain(const struct sockaddr *sa,
			      const char *zone,
			      char **buf_io, size_t bufsz,
			      char **buf_free_r)
{
  size_t req;
  char *p;
  unsigned c, y;
  unsigned long aa;
  const unsigned char *ap;
  int i, j;

  switch (sa->sa_family) {
    AF_CASES(af);
    af_inet:
      req = 4 * 4;
      if (!zone) zone = "in-addr.arpa";
      break;
    af_inet6:
      req = 2 * 32;
      if (!zone) zone = "ip6.arpa";
      break;
    default:
      return ENOSYS;
  }

  req += strlen(zone) + 1;
  if (req <= bufsz)
    p = *buf_io;
  else {
    p = malloc(req); if (!p) return errno;
    *buf_free_r = p;
  }

  *buf_io = p;
  switch (sa->sa_family) {
    AF_CASES(bf);
    bf_inet:
      aa = ntohl(CSIN(sa)->sin_addr.s_addr);
      for (i = 0; i < 4; i++) {
	p += sprintf(p, "%d", (int)(aa & 0xff));
	*p++ = '.';
	aa >>= 8;
      }
      break;
    bf_inet6:
      ap = CSIN6(sa)->sin6_addr.s6_addr + 16;
      for (i = 0; i < 16; i++) {
	c = *--ap;
	for (j = 0; j < 2; j++) {
	  y = c & 0xf;
	  if (y < 10) *p++ = y + '0';
	  else *p++ = y - 10 + 'a';
	  c >>= 4;
	  *p++ = '.';
	}
      }
      break;
    default:
      unknown_af(sa->sa_family);
  }

  strcpy(p, zone);
  return 0;
}


static int inet_rev_parsecomp(const char *p, size_t n)
{
  int i = 0;
  if (n > 3) return -1;

  while (n--) {
    if ('0' <= *p && *p <= '9') i = 10*i + *p++ - '0';
    else return -1;
  }
  return i;
}

static void inet_rev_mkaddr(union gen_addr *addr, const byte *ipv)
{
  addr->v4.s_addr = htonl((ipv[3]<<24) | (ipv[2]<<16) |
			  (ipv[1]<<8) | (ipv[0]));
}

static int inet6_rev_parsecomp(const char *p, size_t n)
{
  if (n != 1) return -1;
  else if ('0' <= *p && *p <= '9') return *p - '0';
  else if ('a' <= *p && *p <= 'f') return *p - 'a' + 10;
  else if ('A' <= *p && *p <= 'F') return *p - 'a' + 10;
  else return -1;
}

static void inet6_rev_mkaddr(union gen_addr *addr, const byte *ipv)
{
  unsigned char *a = addr->v6.s6_addr;
  int i;

  for (i = 0; i < 16; i++)
    a[i] = (ipv[31-2*i] << 4) | (ipv[30-2*i] << 0);
}

static const struct revparse_domain {
  int af;				/* address family */
  int nrevlab;				/* n of reverse-address labels */
  adns_rrtype rrtype;			/* forward-lookup type */

  int (*rev_parsecomp)(const char *p, size_t n);
  /* parse a single component from a label; return the integer value, or -1
   * if it was unintelligible.
   */

  void (*rev_mkaddr)(union gen_addr *addr, const byte *ipv);
  /* write out the parsed address from a vector of parsed components */

  const char *const tail[3];		/* tail label names */
} revparse_domains[NREVDOMAINS] = {
  { AF_INET, 4, adns_r_a, inet_rev_parsecomp, inet_rev_mkaddr,
    { DNS_INADDR_ARPA, 0 } },
  { AF_INET6, 32, adns_r_aaaa, inet6_rev_parsecomp, inet6_rev_mkaddr,
    { DNS_IP6_ARPA, 0 } },
};

#define REVDOMAIN_MAP(rps, labnum) \
  ((labnum) ? (rps)->map : (1 << NREVDOMAINS) - 1)

int adns__revparse_label(struct revparse_state *rps, int labnum,
			 const char *label, int lablen)
{
  unsigned f = REVDOMAIN_MAP(rps, labnum);
  const struct revparse_domain *rpd;
  const char *tp;
  unsigned d;
  int i, ac;

  for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
    if (!(f & d)) continue;
    if (labnum >= rpd->nrevlab) {
      tp = rpd->tail[labnum - rpd->nrevlab];
      if (!tp || strncmp(label, tp, lablen) != 0 || tp[lablen])
	goto mismatch;
    } else {
      ac = rpd->rev_parsecomp(label, lablen);
      if (ac < 0) goto mismatch;
      assert(labnum < sizeof(rps->ipv[i]));
      rps->ipv[i][labnum] = ac;
    }
    continue;

  mismatch:
    f &= ~d;
    if (!f) return -1;
  }

  rps->map = f;
  return 0;
}

int adns__revparse_done(struct revparse_state *rps, int nlabels,
			adns_rrtype *rrtype_r, struct af_addr *addr_r)
{
  unsigned f = REVDOMAIN_MAP(rps, nlabels);
  const struct revparse_domain *rpd;
  unsigned d;
  int i, found = -1;

  for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
    if (!(f & d)) continue;
    if (nlabels >= rpd->nrevlab && !rpd->tail[nlabels - rpd->nrevlab])
      { found = i; continue; }
    f &= ~d;
    if (!f) return -1;
  }
  assert(found >= 0); assert(f == (1 << found));

  rpd = &revparse_domains[found];
  *rrtype_r = rpd->rrtype;
  addr_r->af = rpd->af;
  rpd->rev_mkaddr(&addr_r->addr, rps->ipv[found]);
  return 0;
}
Commit	Line	Data
9136cf0c MW	1	/*
	2	* addrfam.c
	3	* - address-family specific code
	4	*/
	5	/*
	6	* This file is part of adns, which is
	7	* Copyright (C) 1997-2000,2003,2006 Ian Jackson
	8	* Copyright (C) 1999-2000,2003,2006 Tony Finch
	9	* Copyright (C) 1991 Massachusetts Institute of Technology
	10	* (See the file INSTALL for full details.)
	11	*
	12	* This program 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, or (at your option)
	15	* any later version.
	16	*
	17	* This program 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 this program; if not, write to the Free Software Foundation,
	24	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	25	*/
	26
	27	#include <stdlib.h>
	28	#include <errno.h>
	29	#include <limits.h>
	30	#include <unistd.h>
	31
	32	#include <sys/types.h>
	33	#include <netdb.h>
	34	#include <sys/socket.h>
	35	#include <netinet/in.h>
	36	#include <arpa/inet.h>
	37
	38	#include "internal.h"
	39
	40	/*
6480e2df	41	* General address-family operations.
9136cf0c MW	42	*/
	43
	44	#define SIN(sa) ((struct sockaddr_in *)(sa))
705b9b15	45	#define CSIN(sa) ((const struct sockaddr_in *)(sa))
9136cf0c	46
6480e2df MW	47	#define SIN6(sa) ((struct sockaddr_in6 *)(sa))
	48	#define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
	49
	50	/* This gadget (thanks, Richard Kettlewell) makes sure that we handle the
	51	* same set of address families in each switch. */
	52	#define AF_CASES(pre) \
	53	case AF_INET: goto pre##_inet; \
	54	case AF_INET6: goto pre##_inet6
	55
	56	static void unknown_af(int af) {
	57	fprintf(stderr, "ADNS INTERNAL: unknown address family %d\n", af);
	58	abort();
	59	}
9136cf0c	60
6480e2df	61	int adns__af_supported_p(int af)
705b9b15	62	{
6480e2df MW	63	switch (af) {
	64	AF_CASES(af);
	65	af_inet: af_inet6: return 1;
	66	default: return 0;
	67	}
705b9b15 MW	68	}
705b9b15 MW	69
6480e2df MW	70	int adns__sockaddr_equal_p(const struct sockaddr *sa,
	71	const struct sockaddr *sb)
	72	{
	73	if (sa->sa_family != sb->sa_family) return 0;
	74	switch (sa->sa_family) {
	75	AF_CASES(af);
	76	af_inet: {
	77	const struct sockaddr_in sina = CSIN(sa), sinb = CSIN(sb);
	78	return (sina->sin_addr.s_addr == sinb->sin_addr.s_addr &&
	79	sina->sin_port == sinb->sin_port);
	80	}
	81	af_inet6: {
	82	/* Don't check the flowlabel. That's apparently useful for routing
	83	* performance, but doesn't affect the address in any important
	84	* respect.
	85	*/
	86	const struct sockaddr_in6 sin6a = CSIN6(sa), sin6b = CSIN6(sb);
	87	return (memcmp(sin6a->sin6_addr.s6_addr,
	88	sin6b->sin6_addr.s6_addr,
	89	sizeof(sin6a->sin6_addr.s6_addr)) == 0 &&
	90	sin6a->sin6_port == sin6b->sin6_port &&
	91	sin6a->sin6_scope_id == sin6b->sin6_scope_id);
	92	}
	93	default:
	94	unknown_af(sa->sa_family);
	95	return -1;
	96	}
	97	}
9136cf0c	98
6480e2df	99	int adns__gen_pton(const char p, int af_r, union gen_addr *addr_r)
9136cf0c	100	{
6480e2df MW	101	static const int aflist[] = { AF_INET6, AF_INET };
6480e2df MW	102	int i, rc;
9136cf0c	103
6480e2df MW	104	for (i = 0; i < sizeof(aflist)/sizeof(*aflist); i++) {
	105	rc = inet_pton(aflist[i], p, addr_r);
	106	assert(rc >= 0);
	107	if (rc) { *af_r = aflist[i]; return 1; }
	108	}
	109	return 0;
9136cf0c MW	110	}
9136cf0c MW	111
6480e2df	112	int adns__addr_width(int af)
8a53cf7f	113	{
6480e2df MW	114	switch (af) {
	115	AF_CASES(af);
	116	af_inet: return 32;
	117	af_inet6: return 128;
	118	default: unknown_af(af); return -1;
8a53cf7f	119	}
8a53cf7f MW	120	}
8a53cf7f MW	121
6480e2df	122	void adns__prefix_mask(int af, int len, union gen_addr *mask_r)
8a53cf7f	123	{
6480e2df MW	124	switch (af) {
	125	AF_CASES(af);
	126	af_inet:
	127	assert(len <= 32);
	128	mask_r->v4.s_addr = htonl(!len ? 0 : 0xffffffff << (32 - len));
	129	break;
	130	af_inet6: {
	131	int i = len/8, j = len%8;
	132	unsigned char *m = mask_r->v6.s6_addr;
	133
	134	assert(len <= 128);
	135	memset(m, 0xff, i);
	136	if (j) m[i++] = (0xff << (8-j)) & 0xff;
	137	memset(m+i, 0, 16-i);
	138	} break;
	139	default:
	140	unknown_af(af);
	141	break;
	142	}
8a53cf7f MW	143	}
8a53cf7f MW	144
6480e2df	145	int adns__guess_prefix_length(int af, const union gen_addr *addr)
8a53cf7f	146	{
6480e2df MW	147	switch (af) {
	148	AF_CASES(af);
	149	af_inet: {
	150	unsigned a = (ntohl(addr->v4.s_addr) >> 24) & 0xff;
	151
	152	if (a < 128) return 8;
	153	else if (a < 192) return 16;
	154	else if (a < 224) return 24;
	155	else return -1;
	156	} break;
	157	af_inet6:
	158	return 64;
	159	default:
	160	unknown_af(af);
	161	return -1;
	162	}
	163	}
8a53cf7f	164
6480e2df MW	165	int adns__addr_match_p(int addraf, const union gen_addr *addr,
	166	int netaf, const union gen_addr *base,
	167	const union gen_addr *mask)
	168	{
	169	if (addraf != netaf) return 0;
	170	switch (addraf) {
	171	AF_CASES(af);
	172	af_inet:
	173	return (addr->v4.s_addr & mask->v4.s_addr) == base->v4.s_addr;
	174	af_inet6: {
	175	int i;
	176	const char *a = addr->v6.s6_addr;
	177	const char *b = base->v6.s6_addr;
	178	const char *m = mask->v6.s6_addr;
	179
	180	for (i = 0; i < 16; i++)
	181	if ((a[i] & m[i]) != b[i]) return 0;
	182	return 1;
	183	} break;
	184	default:
	185	unknown_af(addraf);
	186	return -1;
8a53cf7f	187	}
8a53cf7f MW	188	}
8a53cf7f MW	189
6480e2df MW	190	const void adns__sockaddr_to_inaddr(const struct sockaddr sa)
	191	{
	192	switch (sa->sa_family) {
	193	AF_CASES(af);
	194	af_inet: return &CSIN(sa)->sin_addr;
	195	af_inet6: return &CSIN6(sa)->sin6_addr;
	196	default: unknown_af(sa->sa_family); return 0;
	197	}
	198	}
9136cf0c MW	199
9136cf0c MW	200	/*
504877d1 IJ	201	* addr2text and text2addr
	202	*/
	203
	204	int adns__addr2text(adns_state ads /* 0 ok /, adns_query qu / 0 ok */,
	205	const struct sockaddr *sa,
	206	char addr_buffer, int addr_buflen,
	207	int *port_r) {
	208	void *src;
	209	int port;
	210
	211	if (*addr_buflen < ADNS_ADDR2TEXT_BUFLEN) {
	212	*addr_buflen = ADNS_ADDR2TEXT_BUFLEN;
	213	return ENOSPC;
	214	}
	215
	216	switch (sa->sa_family) {
	217	AF_CASES(af);
	218	af_inet: src= &CSIN(sa)->sin_addr; port= SIN(sa)->sin_port; break;
	219	af_inet6: src= &CSIN6(sa)->sin6_addr; port= SIN6(sa)->sin6_port; break;
	220	default: return EAFNOSUPPORT;
	221	}
	222
	223	const char ok= inet_ntop(sa->sa_family, src, addr_buffer, addr_buflen);
	224	assert(ok);
	225
	226	if (sa->sa_family == AF_INET6) {
	227	uint32_t scope = CSIN6(sa)->sin6_scope_id;
	228	if (scope) {
	229	scope = ntohl(scope);
	230	int scopeoffset = strlen(addr_buffer);
	231	int remain = *addr_buflen - scopeoffset,
	232	int r = snprintf(addr_buffer + scopeoffset, remain,
	233	"%%%"PRIu32"", scope);
	234	assert(r < *addr_buflen - scopeoffset);
	235	adns__debug(ads,-1,qu, "addr2text: converted scoped address %s",
	236	addr_buffer);
	237	}
	238	}
	239
	240	if (port_r) *port_r= ntohs(port);
	241	return 0;
	242	}
	243
	244	int adns_addr2text(adns_state ads,
	245	const struct sockaddr *sa,
	246	char addr_buffer, int addr_buflen /* set iff ENOSPC */,
	247	int *port_r) {
	248	return adns__addr2text(ads,0, sa,addr_buffer,addr_buflen,port_r);
	249	}
	250
	251	static void text2addr_einval(adns_state ads, adns_query qu,
	252	const char addr, const char problem) {
	253	if (!ads)
	254	char dumpbuf[ADNS_ADDR2TEXT_BUFLEN * 4];
	255
	256	}
	257
	258	int adns__text2addr(adns_state ads /* 0 ok /, adns_query qu / 0 ok */,
	259	const char addr, uint16_t port, struct sockaddr sa,
	260	socklen_t salen / set if OK or ENOSPC */) {
	261	int af;
	262	char copybuf[INET6_ADDRSTRLEN];
	263	char *parse;
	264
265	if (strchr(addr, ":")) {
266
267	af= AF_INET6;
268
269	const char *percent= strchr(addr, "%");
270	if (percent) {
271	ptrdiff_t lhslen = percent - addr;
272	if (lhslen >= INET6_ADDRSTRLEN) {
273	adns__debug(ads,-1,qu, "text2addr: scoped addr lhs too long
274	return EINVAL;
275	}
276	memcpy(copy
277
278	int adns_text2addr(adns_state ads /* may be 0! used for debug log only */,
279	const char addr, int port, struct sockaddr sa,
280	socklen_t salen / set if OK or ENOSPC */);
281
282
283
284	assert(addr_buflen > INET_ADDRSTRLEN && addr_buflen > INET6_ADDRSTRLEN);
285	switch (sa->sa_family) {
286	AF_CASES(af);
287	af_inet: dst= &CSIN(sa)->sin_addr; port= CSIN(sa)->sin_port; break;
288	af_inet6: dst= &CSIN6(sa)->sin6_addr; port= CSIN6(sa)->sin6_port; break;
289	default: return EAFNOSUPPORT;
290	}
291
292	inet_pton(sa->sa_family,
293	const struct sockaddr *sin =
294
295
296
297	/*
6480e2df	298	* Reverse-domain parsing and construction.
9136cf0c MW	299	*/
9136cf0c MW	300
6480e2df MW	301	int adns__make_reverse_domain(const struct sockaddr *sa,
	302	const char *zone,
	303	char **buf_io, size_t bufsz,
	304	char **buf_free_r)
	305	{
	306	size_t req;
	307	char *p;
	308	unsigned c, y;
	309	unsigned long aa;
	310	const unsigned char *ap;
	311	int i, j;
9136cf0c	312
6480e2df MW	313	switch (sa->sa_family) {
	314	AF_CASES(af);
	315	af_inet:
	316	req = 4 * 4;
	317	if (!zone) zone = "in-addr.arpa";
	318	break;
	319	af_inet6:
	320	req = 2 * 32;
	321	if (!zone) zone = "ip6.arpa";
	322	break;
	323	default:
	324	return ENOSYS;
	325	}
9136cf0c	326
6480e2df MW	327	req += strlen(zone) + 1;
	328	if (req <= bufsz)
	329	p = *buf_io;
	330	else {
	331	p = malloc(req); if (!p) return errno;
	332	*buf_free_r = p;
	333	}
705b9b15	334
6480e2df MW	335	*buf_io = p;
	336	switch (sa->sa_family) {
	337	AF_CASES(bf);
	338	bf_inet:
	339	aa = ntohl(CSIN(sa)->sin_addr.s_addr);
	340	for (i = 0; i < 4; i++) {
	341	p += sprintf(p, "%d", (int)(aa & 0xff));
	342	*p++ = '.';
	343	aa >>= 8;
	344	}
	345	break;
	346	bf_inet6:
	347	ap = CSIN6(sa)->sin6_addr.s6_addr + 16;
	348	for (i = 0; i < 16; i++) {
	349	c = *--ap;
	350	for (j = 0; j < 2; j++) {
	351	y = c & 0xf;
	352	if (y < 10) *p++ = y + '0';
	353	else *p++ = y - 10 + 'a';
	354	c >>= 4;
	355	*p++ = '.';
	356	}
	357	}
	358	break;
	359	default:
	360	unknown_af(sa->sa_family);
	361	}
9136cf0c	362
6480e2df MW	363	strcpy(p, zone);
6480e2df MW	364	return 0;
9136cf0c MW	365	}
9136cf0c MW	366
9136cf0c	367
6480e2df	368	static int inet_rev_parsecomp(const char *p, size_t n)
9136cf0c	369	{
6480e2df MW	370	int i = 0;
6480e2df MW	371	if (n > 3) return -1;
9136cf0c	372
6480e2df MW	373	while (n--) {
	374	if ('0' <= p && p <= '9') i = 10i + p++ - '0';
	375	else return -1;
	376	}
	377	return i;
	378	}
	379
	380	static void inet_rev_mkaddr(union gen_addr addr, const byte ipv)
	381	{
	382	addr->v4.s_addr = htonl((ipv[3]<<24) \| (ipv[2]<<16) \|
	383	(ipv[1]<<8) \| (ipv[0]));
9136cf0c MW	384	}
9136cf0c MW	385
8a53cf7f MW	386	static int inet6_rev_parsecomp(const char *p, size_t n)
	387	{
	388	if (n != 1) return -1;
	389	else if ('0' <= p && p <= '9') return *p - '0';
	390	else if ('a' <= p && p <= 'f') return *p - 'a' + 10;
	391	else if ('A' <= p && p <= 'F') return *p - 'a' + 10;
	392	else return -1;
	393	}
	394
	395	static void inet6_rev_mkaddr(union gen_addr addr, const byte ipv)
	396	{
	397	unsigned char *a = addr->v6.s6_addr;
	398	int i;
	399
	400	for (i = 0; i < 16; i++)
	401	a[i] = (ipv[31-2i] << 4) \| (ipv[30-2i] << 0);
	402	}
	403
6480e2df MW	404	static const struct revparse_domain {
	405	int af; /* address family */
	406	int nrevlab; /* n of reverse-address labels */
	407	adns_rrtype rrtype; /* forward-lookup type */
	408
	409	int (rev_parsecomp)(const char p, size_t n);
	410	/* parse a single component from a label; return the integer value, or -1
	411	* if it was unintelligible.
	412	*/
	413
	414	void (rev_mkaddr)(union gen_addr addr, const byte *ipv);
	415	/* write out the parsed address from a vector of parsed components */
	416
	417	const char const tail[3]; / tail label names */
	418	} revparse_domains[NREVDOMAINS] = {
	419	{ AF_INET, 4, adns_r_a, inet_rev_parsecomp, inet_rev_mkaddr,
	420	{ DNS_INADDR_ARPA, 0 } },
	421	{ AF_INET6, 32, adns_r_aaaa, inet6_rev_parsecomp, inet6_rev_mkaddr,
	422	{ DNS_IP6_ARPA, 0 } },
	423	};
8a53cf7f	424
6480e2df MW	425	#define REVDOMAIN_MAP(rps, labnum) \
	426	((labnum) ? (rps)->map : (1 << NREVDOMAINS) - 1)
	427
	428	int adns__revparse_label(struct revparse_state *rps, int labnum,
	429	const char *label, int lablen)
	430	{
	431	unsigned f = REVDOMAIN_MAP(rps, labnum);
	432	const struct revparse_domain *rpd;
	433	const char *tp;
	434	unsigned d;
	435	int i, ac;
	436
	437	for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
	438	if (!(f & d)) continue;
	439	if (labnum >= rpd->nrevlab) {
	440	tp = rpd->tail[labnum - rpd->nrevlab];
	441	if (!tp \|\| strncmp(label, tp, lablen) != 0 \|\| tp[lablen])
	442	goto mismatch;
	443	} else {
	444	ac = rpd->rev_parsecomp(label, lablen);
	445	if (ac < 0) goto mismatch;
	446	assert(labnum < sizeof(rps->ipv[i]));
	447	rps->ipv[i][labnum] = ac;
8a53cf7f	448	}
6480e2df MW	449	continue;
	450
	451	mismatch:
	452	f &= ~d;
	453	if (!f) return -1;
8a53cf7f	454	}
6480e2df MW	455
	456	rps->map = f;
	457	return 0;
8a53cf7f MW	458	}
8a53cf7f MW	459
6480e2df MW	460	int adns__revparse_done(struct revparse_state *rps, int nlabels,
	461	adns_rrtype rrtype_r, struct af_addr addr_r)
	462	{
	463	unsigned f = REVDOMAIN_MAP(rps, nlabels);
	464	const struct revparse_domain *rpd;
	465	unsigned d;
	466	int i, found = -1;
	467
	468	for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
	469	if (!(f & d)) continue;
	470	if (nlabels >= rpd->nrevlab && !rpd->tail[nlabels - rpd->nrevlab])
	471	{ found = i; continue; }
	472	f &= ~d;
	473	if (!f) return -1;
	474	}
	475	assert(found >= 0); assert(f == (1 << found));
	476
	477	rpd = &revparse_domains[found];
	478	*rrtype_r = rpd->rrtype;
	479	addr_r->af = rpd->af;
	480	rpd->rev_mkaddr(&addr_r->addr, rps->ipv[found]);
	481	return 0;
	482	}