[fwd] / inet.c

/* -*-c-*-
 *
 * $Id: inet.c,v 1.5 2003/11/25 14:08:23 mdw Exp $
 *
 * Protocol specific definitions for IPv4 sockets
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the `fw' port forwarder.
 *
 * `fw' 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 of the License, or
 * (at your option) any later version.
 * 
 * `fw' 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 `fw'; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: inet.c,v $
 * Revision 1.5  2003/11/25 14:08:23  mdw
 * Debianization.  Socket target options.  Internet binding.
 *
 * Revision 1.4  2002/01/13 14:49:56  mdw
 * Conditional compilation for @getnetbyname@, since Cygwin doesn't have
 * it.
 *
 * Revision 1.3  2000/08/01 17:59:56  mdw
 * Switch over to using `size_t' for socket address lengths.
 *
 * Revision 1.2  1999/07/27 18:30:53  mdw
 * Various minor portability fixes.
 *
 * Revision 1.1  1999/07/26 23:34:11  mdw
 * New socket address types.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include "config.h"

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <unistd.h>

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

#include <mLib/alloc.h>
#include <mLib/dstr.h>
#include <mLib/fdflags.h>
#include <mLib/report.h>
#include <mLib/sub.h>

#include "acl.h"
#include "addr.h"
#include "conf.h"
#include "fw.h"
#include "identify.h"
#include "inet.h"
#include "reffd.h"
#include "scan.h"
#include "socket.h"

/*----- Data structures ---------------------------------------------------*/

typedef struct inet_addrx {
  addr a;
  struct sockaddr_in sin;
} inet_addrx;

typedef struct inet_opts {
  addr_opts ao;
  struct in_addr bind;
} inet_opts;

typedef struct inet_srcopts {
  inet_opts io;
  acl_entry *acl;
  acl_entry **acltail;
} inet_srcopts;

typedef struct inet_targopts {
  inet_opts io;
} inet_targopts;

static inet_srcopts inet_globalsrc =
  { { { 0 }, { INADDR_ANY } }, 0, &inet_globalsrc.acl };
static inet_targopts inet_globaltarg =
  { { { 0 }, { INADDR_ANY } } };

/*----- Protocol operations -----------------------------------------------*/

/* --- @read@ --- */

static addr *inet_read(scanner *sc, unsigned type)
{
  inet_addrx *ia = xmalloc(sizeof(*ia));

  ia->a.ops = &inet_ops;
  ia->a.sz = sizeof(struct sockaddr_in);
  memset(&ia->sin, 0, sizeof(ia->sin));
  ia->sin.sin_family = AF_INET;

  /* --- Read the host address part --- */

  switch (type) {
    case ADDR_SRC:
      if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "port") == 0)
	token(sc);
      ia->sin.sin_addr.s_addr = htonl(INADDR_ANY);
      break;
    case ADDR_DEST: {
      struct hostent *h;
      dstr d = DSTR_INIT;
      conf_name(sc, '.', &d);
      if ((h = gethostbyname(d.buf)) == 0)
	error(sc, "couldn't resolve Internet address `%s'", d.buf);
      memcpy(&ia->sin.sin_addr, h->h_addr, sizeof(struct in_addr));
      dstr_destroy(&d);
      if (sc->t == ':')
	token(sc);
    } break;
  }

  /* --- Read the port number --- */

  {
    struct servent *s;

    if (sc->t != CTOK_WORD)
      error(sc, "parse error, TCP port expected");
    if (isdigit((unsigned char)sc->d.buf[0]))
      ia->sin.sin_port = htons(atoi(sc->d.buf));
    else if ((s = getservbyname(sc->d.buf, "tcp")) == 0)
      error(sc, "unknown tcp service `%s'", sc->d.buf);
    else
      ia->sin.sin_port = s->s_port;
    token(sc);
  }

  return (&ia->a);
}

/* --- @destroy@ --- */

static void inet_destroy(addr *a)
{
  inet_addrx *ia = (inet_addrx *)a;
  DESTROY(ia);
}

/* --- @print@ --- */

static void inet_print(addr *a, unsigned type, dstr *d)
{
  inet_addrx *ia = (inet_addrx *)a;
  switch (type) {
    case ADDR_SRC:
      dstr_putf(d, "inet:%u", (unsigned)ntohs(ia->sin.sin_port));
      break;
    case ADDR_DEST:
      dstr_putf(d, "inet:%s:%u",
		inet_ntoa(ia->sin.sin_addr),
		(unsigned)ntohs(ia->sin.sin_port));
      break;
  }
}

/* --- @initopts@ --- */

static addr_opts *inet_initsrcopts(void)
{
  inet_srcopts *io = CREATE(inet_srcopts);
  *io = inet_globalsrc;
  io->acl = 0;
  io->acltail = &io->acl;
  return (&io->io.ao);
}

static addr_opts *inet_inittargopts(void)
{
  inet_targopts *io = CREATE(inet_targopts);
  *io = inet_globaltarg;
  return (&io->io.ao);
}

/* --- @option@ --- */

static void addropt(scanner *sc, inet_opts *io)
{
  dstr d = DSTR_INIT;
  struct hostent *h;

  token(sc);
  if (sc->t == '=')
    token(sc);
  if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "any") == 0)
    io->bind.s_addr = INADDR_ANY;
  else {
    conf_name(sc, '.', &d);
    if ((h = gethostbyname(d.buf)) == 0)
      error(sc, "couldn't resolve address `%s'", d.buf);
    memcpy(&io->bind, h->h_addr, sizeof(struct in_addr));
  }
}

static int srcopt(scanner *sc, addr_opts *ao)
{
  inet_srcopts *io = (inet_srcopts *)ao;
  unsigned act;

  CONF_BEGIN(sc, "source", "Internet socket source")

  /* --- Initialization --- */

  if (!io) {
    if (!inet_globalsrc.acltail)
      inet_globalsrc.acltail = &inet_globalsrc.acl;
    io = &inet_globalsrc;
  }

  /* --- Source address configuration --- */

  if (strcmp(sc->d.buf, "addr") == 0) {
    addropt(sc, &io->io);
    CONF_ACCEPT;
  }

  /* --- Access control limitations --- */

  if ((strcmp(sc->d.buf, "allow") == 0 && (act = ACL_ALLOW, 1)) ||
       (strcmp(sc->d.buf, "deny") == 0 && (act = ACL_DENY, 1))) {
    struct hostent *h;
    struct netent *n;
    struct in_addr a, m;
    dstr d = DSTR_INIT;

    /* --- Find out what's going on --- */

    token(sc);
    if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "from") == 0)
      token(sc);

    if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "priv-port") == 0) {
      acl_addpriv(&io->acltail, act);
      token(sc);
    } else {
      if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "host") == 0)
	token(sc);

      /* --- Find the host or network address --- */

      conf_name(sc, '.', &d);
#ifdef HAVE_GETNETBYNAME
      if ((n = getnetbyname(d.buf)) != 0)
	a.s_addr = htonl(n->n_net);
      else
#endif
	if ((h = gethostbyname(d.buf)) == 0)
	  error(sc, "couldn't resolve address `%s'", d.buf);
	else
	  memcpy(&a, h->h_addr, sizeof(struct in_addr));

      /* --- Find the netmask, if any --- */

      if (sc->t != '/')
	m.s_addr = ~0ul;
      else {
	token(sc);
	DRESET(&d);
	conf_name(sc, '.', &d);
	if (strchr(d.buf, '.') == 0) {
	  int n = atoi(d.buf);
	  if (n == 0)
	    m.s_addr = 0;
	  else
	    m.s_addr = htonl((~0ul << (32 - n)) & 0xffffffff);
	} else {
#ifdef HAVE_INET_ATON
	  if (!inet_aton(d.buf, &m))
	    error(sc, "bad netmask `%s'", d.buf);
#else
	  m.s_addr = inet_addr(d.buf);
#endif
	}
      }
      dstr_destroy(&d);

      /* --- Add the access control entry --- */

      acl_addhost(&io->acltail, act, a, m);
    }
    CONF_ACCEPT;
  }

  /* --- Anything unrecognized --- */

  CONF_END;
}

static int targopt(scanner *sc, addr_opts *ao)
{
  inet_targopts *io = (inet_targopts *)ao;

  CONF_BEGIN(sc, "dest", "Internet socket target");
  if (strcmp(sc->d.buf, "addr") == 0) {
    addropt(sc, &io->io);
    CONF_ACCEPT;
  }
  CONF_END;
}

static int inet_option(scanner *sc, addr_opts *ao, unsigned type)
{
  CONF_BEGIN(sc, "inet", "Internet socket");
  if (type != ADDR_DEST && srcopt(sc, ao))
    CONF_ACCEPT;
  if (type != ADDR_SRC && targopt(sc, ao))
    CONF_ACCEPT;
  CONF_END;
}

/* --- @freeopts@ --- */

static void inet_freesrcopts(addr_opts *ao)
{
  inet_srcopts *io = (inet_srcopts *)ao;
  acl_free(io->acl);
  DESTROY(io);
}

static void inet_freetargopts(addr_opts *ao)
{
  inet_targopts *io = (inet_targopts *)ao;
  DESTROY(io);
}

/* --- @bind@ --- */

static int inet_bind(addr *a, addr_opts *ao)
{
  inet_addrx *ia = (inet_addrx *)a;
  inet_srcopts *io = (inet_srcopts *)ao;
  struct sockaddr_in sin;
  int opt = 1;
  int fd;

  if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
    goto fail_0;
  setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
  fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
  sin = ia->sin;
  sin.sin_addr = io->io.bind;
  if (bind(fd, (struct sockaddr *)&sin, sizeof(ia->sin)))
    goto fail_1;
  return (fd);

fail_1:
  close(fd);
fail_0:
  return (-1);
}

/* --- @accept@ --- */

static reffd *inet_accept(int fd, addr_opts *ao, const char *desc)
{
  inet_srcopts *io = (inet_srcopts *)ao;
  int nfd;
  id_req q;
  size_t lsinsz = sizeof(q.lsin), rsinsz = sizeof(q.rsin);
  int act = ACL_ALLOW;

  /* --- Accept the new connection --- */

  if ((nfd = accept(fd, (struct sockaddr *)&q.rsin, &rsinsz)) < 0)
    return (0);
  if (getsockname(nfd, (struct sockaddr *)&q.lsin, &lsinsz)) {
    close(nfd);
    return (0);
  }
  q.desc = desc;
  q.r = reffd_init(nfd);

  /* --- Find out whether this connection is allowed --- */

  if (!acl_check(io->acl, q.rsin.sin_addr, ntohs(q.rsin.sin_port), &act))
    acl_check(inet_globalsrc.acl, q.rsin.sin_addr,
	      ntohs(q.rsin.sin_port), &act);
  if (act != ACL_ALLOW) {
    q.act = "refused";
    if (!(io->io.ao.f & ADDRF_NOLOG))
      identify(&q);
    REFFD_DEC(q.r);
    return (0);
  }

  /* --- Everything seems to be OK --- */

  q.act = "accepted";
  if (!(io->io.ao.f & ADDRF_NOLOG))
    identify(&q);
  return (q.r);
}

/* --- @connect@ --- */

static int inet_connect(addr *a, addr_opts *ao, conn *c, endpt *e)
{
  inet_addrx *ia = (inet_addrx *)a;
  inet_targopts *io = (inet_targopts *)ao;
  int fd;

  if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
    goto fail_0;
  if (io->io.bind.s_addr != INADDR_ANY) {
    struct sockaddr_in sin;
    memset(&sin, 0, sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_addr = io->io.bind;
    sin.sin_port = 0;
    if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
      goto fail_1;
  }
  fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
  return (conn_init(c, sel, fd, (struct sockaddr *)&ia->sin, sizeof(ia->sin),
		    starget_connected, e));
fail_1:
  close(fd);
fail_0:
  return (-1);
}

/* --- Ops table --- */

addr_ops inet_ops = {
  "inet",
  inet_read, inet_destroy, inet_print,
  inet_initsrcopts, inet_option, inet_freesrcopts,
  inet_bind, 0, inet_accept,
  inet_inittargopts, inet_freetargopts,
  inet_connect  
};

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
aa1f699e	1	/* --c--
aa1f699e	2	*
0ac54f22	3	* $Id: inet.c,v 1.5 2003/11/25 14:08:23 mdw Exp $
aa1f699e	4	*
	5	* Protocol specific definitions for IPv4 sockets
	6	*
	7	* (c) 1999 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of the `fw' port forwarder.
	13	*
	14	* `fw' is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* `fw' is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with `fw'; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
	28
	29	/----- Revision history --------------------------------------------------
	30	*
	31	* $Log: inet.c,v $
0ac54f22	32	* Revision 1.5 2003/11/25 14:08:23 mdw
	33	* Debianization. Socket target options. Internet binding.
	34	*
1a039139	35	* Revision 1.4 2002/01/13 14:49:56 mdw
	36	* Conditional compilation for @getnetbyname@, since Cygwin doesn't have
	37	* it.
	38	*
bc241e98	39	* Revision 1.3 2000/08/01 17:59:56 mdw
	40	* Switch over to using `size_t' for socket address lengths.
	41	*
e0ce9d38	42	* Revision 1.2 1999/07/27 18:30:53 mdw
	43	* Various minor portability fixes.
	44	*
aa1f699e	45	* Revision 1.1 1999/07/26 23:34:11 mdw
	46	* New socket address types.
	47	*
	48	*/
	49
	50	/----- Header files ------------------------------------------------------/
	51
	52	#include "config.h"
	53
	54	#include <ctype.h>
	55	#include <errno.h>
	56	#include <stdio.h>
	57	#include <stdlib.h>
	58	#include <string.h>
	59
	60	#include <sys/types.h>
	61	#include <unistd.h>
	62
	63	#include <sys/socket.h>
	64	#include <netinet/in.h>
	65	#include <arpa/inet.h>
	66	#include <netdb.h>
	67
	68	#include <mLib/alloc.h>
	69	#include <mLib/dstr.h>
0ac54f22	70	#include <mLib/fdflags.h>
aa1f699e	71	#include <mLib/report.h>
	72	#include <mLib/sub.h>
	73
	74	#include "acl.h"
	75	#include "addr.h"
	76	#include "conf.h"
0ac54f22	77	#include "fw.h"
aa1f699e	78	#include "identify.h"
	79	#include "inet.h"
	80	#include "reffd.h"
	81	#include "scan.h"
0ac54f22	82	#include "socket.h"
aa1f699e	83
	84	/----- Data structures ---------------------------------------------------/
	85
	86	typedef struct inet_addrx {
	87	addr a;
	88	struct sockaddr_in sin;
	89	} inet_addrx;
	90
	91	typedef struct inet_opts {
	92	addr_opts ao;
0ac54f22	93	struct in_addr bind;
	94	} inet_opts;
	95
	96	typedef struct inet_srcopts {
	97	inet_opts io;
aa1f699e	98	acl_entry *acl;
aa1f699e	99	acl_entry **acltail;
0ac54f22	100	} inet_srcopts;
	101
	102	typedef struct inet_targopts {
	103	inet_opts io;
	104	} inet_targopts;
	105
	106	static inet_srcopts inet_globalsrc =
	107	{ { { 0 }, { INADDR_ANY } }, 0, &inet_globalsrc.acl };
	108	static inet_targopts inet_globaltarg =
	109	{ { { 0 }, { INADDR_ANY } } };
aa1f699e	110
	111	/----- Protocol operations -----------------------------------------------/
	112
	113	/* --- @read@ --- */
	114
	115	static addr inet_read(scanner sc, unsigned type)
	116	{
	117	inet_addrx ia = xmalloc(sizeof(ia));
	118
	119	ia->a.ops = &inet_ops;
	120	ia->a.sz = sizeof(struct sockaddr_in);
e0ce9d38	121	memset(&ia->sin, 0, sizeof(ia->sin));
aa1f699e	122	ia->sin.sin_family = AF_INET;
	123
	124	/* --- Read the host address part --- */
	125
	126	switch (type) {
	127	case ADDR_SRC:
	128	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "port") == 0)
	129	token(sc);
	130	ia->sin.sin_addr.s_addr = htonl(INADDR_ANY);
	131	break;
	132	case ADDR_DEST: {
	133	struct hostent *h;
	134	dstr d = DSTR_INIT;
	135	conf_name(sc, '.', &d);
	136	if ((h = gethostbyname(d.buf)) == 0)
	137	error(sc, "couldn't resolve Internet address `%s'", d.buf);
	138	memcpy(&ia->sin.sin_addr, h->h_addr, sizeof(struct in_addr));
	139	dstr_destroy(&d);
	140	if (sc->t == ':')
	141	token(sc);
	142	} break;
	143	}
	144
	145	/* --- Read the port number --- */
	146
	147	{
	148	struct servent *s;
	149
	150	if (sc->t != CTOK_WORD)
	151	error(sc, "parse error, TCP port expected");
	152	if (isdigit((unsigned char)sc->d.buf[0]))
	153	ia->sin.sin_port = htons(atoi(sc->d.buf));
	154	else if ((s = getservbyname(sc->d.buf, "tcp")) == 0)
	155	error(sc, "unknown tcp service `%s'", sc->d.buf);
	156	else
	157	ia->sin.sin_port = s->s_port;
	158	token(sc);
	159	}
	160
	161	return (&ia->a);
	162	}
	163
	164	/* --- @destroy@ --- */
	165
	166	static void inet_destroy(addr *a)
	167	{
	168	inet_addrx ia = (inet_addrx )a;
	169	DESTROY(ia);
	170	}
	171
	172	/* --- @print@ --- */
	173
	174	static void inet_print(addr a, unsigned type, dstr d)
	175	{
	176	inet_addrx ia = (inet_addrx )a;
	177	switch (type) {
	178	case ADDR_SRC:
	179	dstr_putf(d, "inet:%u", (unsigned)ntohs(ia->sin.sin_port));
	180	break;
	181	case ADDR_DEST:
	182	dstr_putf(d, "inet:%s:%u",
	183	inet_ntoa(ia->sin.sin_addr),
	184	(unsigned)ntohs(ia->sin.sin_port));
	185	break;
186	}
187	}
188
189	/* --- @initopts@ --- */
190
0ac54f22	191	static addr_opts *inet_initsrcopts(void)
aa1f699e	192	{
0ac54f22	193	inet_srcopts *io = CREATE(inet_srcopts);
0ac54f22	194	*io = inet_globalsrc;
aa1f699e	195	io->acl = 0;
aa1f699e	196	io->acltail = &io->acl;
0ac54f22	197	return (&io->io.ao);
	198	}
	199
	200	static addr_opts *inet_inittargopts(void)
	201	{
	202	inet_targopts *io = CREATE(inet_targopts);
	203	*io = inet_globaltarg;
	204	return (&io->io.ao);
aa1f699e	205	}
	206
	207	/* --- @option@ --- */
	208
0ac54f22	209	static void addropt(scanner sc, inet_opts io)
aa1f699e	210	{
0ac54f22	211	dstr d = DSTR_INIT;
0ac54f22	212	struct hostent *h;
aa1f699e	213
0ac54f22	214	token(sc);
	215	if (sc->t == '=')
	216	token(sc);
	217	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "any") == 0)
	218	io->bind.s_addr = INADDR_ANY;
	219	else {
	220	conf_name(sc, '.', &d);
	221	if ((h = gethostbyname(d.buf)) == 0)
	222	error(sc, "couldn't resolve address `%s'", d.buf);
	223	memcpy(&io->bind, h->h_addr, sizeof(struct in_addr));
	224	}
	225	}
aa1f699e	226
0ac54f22	227	static int srcopt(scanner sc, addr_opts ao)
	228	{
	229	inet_srcopts io = (inet_srcopts )ao;
aa1f699e	230	unsigned act;
aa1f699e	231
0ac54f22	232	CONF_BEGIN(sc, "source", "Internet socket source")
	233
	234	/* --- Initialization --- */
	235
	236	if (!io) {
	237	if (!inet_globalsrc.acltail)
	238	inet_globalsrc.acltail = &inet_globalsrc.acl;
	239	io = &inet_globalsrc;
	240	}
	241
	242	/* --- Source address configuration --- */
	243
	244	if (strcmp(sc->d.buf, "addr") == 0) {
	245	addropt(sc, &io->io);
	246	CONF_ACCEPT;
	247	}
	248
aa1f699e	249	/* --- Access control limitations --- */
	250
	251	if ((strcmp(sc->d.buf, "allow") == 0 && (act = ACL_ALLOW, 1)) \|\|
	252	(strcmp(sc->d.buf, "deny") == 0 && (act = ACL_DENY, 1))) {
	253	struct hostent *h;
	254	struct netent *n;
	255	struct in_addr a, m;
	256	dstr d = DSTR_INIT;
	257
0ac54f22	258	/* --- Find out what's going on --- */
aa1f699e	259
	260	token(sc);
	261	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "from") == 0)
	262	token(sc);
aa1f699e	263
0ac54f22	264	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "priv-port") == 0) {
0ac54f22	265	acl_addpriv(&io->acltail, act);
aa1f699e	266	token(sc);
0ac54f22	267	} else {
	268	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "host") == 0)
	269	token(sc);
	270
	271	/* --- Find the host or network address --- */
	272
aa1f699e	273	conf_name(sc, '.', &d);
0ac54f22	274	#ifdef HAVE_GETNETBYNAME
	275	if ((n = getnetbyname(d.buf)) != 0)
	276	a.s_addr = htonl(n->n_net);
	277	else
	278	#endif
	279	if ((h = gethostbyname(d.buf)) == 0)
	280	error(sc, "couldn't resolve address `%s'", d.buf);
aa1f699e	281	else
0ac54f22	282	memcpy(&a, h->h_addr, sizeof(struct in_addr));
	283
	284	/* --- Find the netmask, if any --- */
	285
	286	if (sc->t != '/')
	287	m.s_addr = ~0ul;
	288	else {
	289	token(sc);
	290	DRESET(&d);
	291	conf_name(sc, '.', &d);
	292	if (strchr(d.buf, '.') == 0) {
	293	int n = atoi(d.buf);
	294	if (n == 0)
	295	m.s_addr = 0;
	296	else
	297	m.s_addr = htonl((~0ul << (32 - n)) & 0xffffffff);
	298	} else {
aa1f699e	299	#ifdef HAVE_INET_ATON
0ac54f22	300	if (!inet_aton(d.buf, &m))
0ac54f22	301	error(sc, "bad netmask `%s'", d.buf);
aa1f699e	302	#else
0ac54f22	303	m.s_addr = inet_addr(d.buf);
aa1f699e	304	#endif
0ac54f22	305	}
aa1f699e	306	}
0ac54f22	307	dstr_destroy(&d);
aa1f699e	308
0ac54f22	309	/* --- Add the access control entry --- */
aa1f699e	310
0ac54f22	311	acl_addhost(&io->acltail, act, a, m);
0ac54f22	312	}
aa1f699e	313	CONF_ACCEPT;
	314	}
	315
	316	/* --- Anything unrecognized --- */
	317
	318	CONF_END;
	319	}
	320
0ac54f22	321	static int targopt(scanner sc, addr_opts ao)
	322	{
	323	inet_targopts io = (inet_targopts )ao;
	324
	325	CONF_BEGIN(sc, "dest", "Internet socket target");
	326	if (strcmp(sc->d.buf, "addr") == 0) {
	327	addropt(sc, &io->io);
	328	CONF_ACCEPT;
	329	}
	330	CONF_END;
	331	}
	332
	333	static int inet_option(scanner sc, addr_opts ao, unsigned type)
	334	{
	335	CONF_BEGIN(sc, "inet", "Internet socket");
	336	if (type != ADDR_DEST && srcopt(sc, ao))
	337	CONF_ACCEPT;
	338	if (type != ADDR_SRC && targopt(sc, ao))
	339	CONF_ACCEPT;
	340	CONF_END;
	341	}
	342
	343	/* --- @freeopts@ --- */
	344
	345	static void inet_freesrcopts(addr_opts *ao)
	346	{
	347	inet_srcopts io = (inet_srcopts )ao;
	348	acl_free(io->acl);
	349	DESTROY(io);
	350	}
	351
	352	static void inet_freetargopts(addr_opts *ao)
	353	{
	354	inet_targopts io = (inet_targopts )ao;
	355	DESTROY(io);
	356	}
	357
	358	/* --- @bind@ --- */
	359
	360	static int inet_bind(addr a, addr_opts ao)
	361	{
	362	inet_addrx ia = (inet_addrx )a;
	363	inet_srcopts io = (inet_srcopts )ao;
	364	struct sockaddr_in sin;
	365	int opt = 1;
	366	int fd;
	367
	368	if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
	369	goto fail_0;
	370	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
	371	fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
	372	sin = ia->sin;
	373	sin.sin_addr = io->io.bind;
	374	if (bind(fd, (struct sockaddr *)&sin, sizeof(ia->sin)))
	375	goto fail_1;
	376	return (fd);
	377
	378	fail_1:
	379	close(fd);
	380	fail_0:
	381	return (-1);
	382	}
	383
aa1f699e	384	/* --- @accept@ --- */
	385
	386	static reffd inet_accept(int fd, addr_opts ao, const char *desc)
	387	{
0ac54f22	388	inet_srcopts io = (inet_srcopts )ao;
aa1f699e	389	int nfd;
aa1f699e	390	id_req q;
bc241e98	391	size_t lsinsz = sizeof(q.lsin), rsinsz = sizeof(q.rsin);
0ac54f22	392	int act = ACL_ALLOW;
aa1f699e	393
	394	/* --- Accept the new connection --- */
	395
	396	if ((nfd = accept(fd, (struct sockaddr *)&q.rsin, &rsinsz)) < 0)
	397	return (0);
	398	if (getsockname(nfd, (struct sockaddr *)&q.lsin, &lsinsz)) {
	399	close(nfd);
	400	return (0);
	401	}
	402	q.desc = desc;
	403	q.r = reffd_init(nfd);
	404
	405	/* --- Find out whether this connection is allowed --- */
	406
0ac54f22	407	if (!acl_check(io->acl, q.rsin.sin_addr, ntohs(q.rsin.sin_port), &act))
	408	acl_check(inet_globalsrc.acl, q.rsin.sin_addr,
	409	ntohs(q.rsin.sin_port), &act);
	410	if (act != ACL_ALLOW) {
aa1f699e	411	q.act = "refused";
0ac54f22	412	if (!(io->io.ao.f & ADDRF_NOLOG))
aa1f699e	413	identify(&q);
	414	REFFD_DEC(q.r);
	415	return (0);
	416	}
	417
	418	/* --- Everything seems to be OK --- */
	419
	420	q.act = "accepted";
0ac54f22	421	if (!(io->io.ao.f & ADDRF_NOLOG))
aa1f699e	422	identify(&q);
	423	return (q.r);
	424	}
	425
0ac54f22	426	/* --- @connect@ --- */
aa1f699e	427
0ac54f22	428	static int inet_connect(addr a, addr_opts ao, conn c, endpt e)
aa1f699e	429	{
0ac54f22	430	inet_addrx ia = (inet_addrx )a;
	431	inet_targopts io = (inet_targopts )ao;
	432	int fd;
	433
	434	if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
	435	goto fail_0;
	436	if (io->io.bind.s_addr != INADDR_ANY) {
	437	struct sockaddr_in sin;
	438	memset(&sin, 0, sizeof(sin));
	439	sin.sin_family = AF_INET;
	440	sin.sin_addr = io->io.bind;
	441	sin.sin_port = 0;
	442	if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
	443	goto fail_1;
	444	}
	445	fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
	446	return (conn_init(c, sel, fd, (struct sockaddr *)&ia->sin, sizeof(ia->sin),
	447	starget_connected, e));
	448	fail_1:
	449	close(fd);
	450	fail_0:
	451	return (-1);
aa1f699e	452	}
	453
	454	/* --- Ops table --- */
	455
	456	addr_ops inet_ops = {
0ac54f22	457	"inet",
aa1f699e	458	inet_read, inet_destroy, inet_print,
0ac54f22	459	inet_initsrcopts, inet_option, inet_freesrcopts,
	460	inet_bind, 0, inet_accept,
	461	inet_inittargopts, inet_freetargopts,
	462	inet_connect
aa1f699e	463	};
	464
	465	/----- That's all, folks -------------------------------------------------/