[fwd] / inet.c

/* -*-c-*-
 *
 * Protocol specific definitions for IPv4 sockets
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of the `fwd' port forwarder.
 *
 * `fwd' 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.
 *
 * `fwd' 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 `fwd'; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "fwd.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;
  int ipriv;
} inet_targopts;

#define ADDRF_PRIVCONN 16u

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;
  io->ipriv = -1;
  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") == 0 ||
			       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 = (in_addr_t)~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;
  }
  if (strcmp(sc->d.buf, "priv") == 0 ||
      strcmp(sc->d.buf, "priv-port") == 0) {
    token(sc);
    if (sc->t == '=') token(sc);
    if (conf_enum(sc, "no,yes", ENUM_ABBREV, "privileged connection status"))
      io->io.ao.f |= ADDRF_PRIVCONN;
    else
      io->io.ao.f &= ~ADDRF_PRIVCONN;
    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;
}

/* --- @confirm@ --- */

static void inet_confirm(addr *a, unsigned type, addr_opts *ao)
{
  inet_addrx *ia = (inet_addrx *)a;

  switch (type) {
    case ADDR_DEST: {
      inet_targopts *io = (inet_targopts *)ao;
      if ((io->io.ao.f & ADDRF_PRIVCONN) &&
	  (io->ipriv = privconn_adddest(ia->sin.sin_addr,
					ia->sin.sin_port)) < 0)
	die(1, "couldn't add privileged connection target (too late)");
    } break;
  }
}

/* --- @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;
  socklen_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 (io->ipriv >= 0) {
    return (privconn_connect(c, sel, io->ipriv, io->io.bind,
			     starget_connected, e));
  }
  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_confirm, 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	*
aa1f699e	3	* Protocol specific definitions for IPv4 sockets
	4	*
	5	* (c) 1999 Straylight/Edgeware
	6	*/
	7
206212ca	8	/----- Licensing notice --------------------------------------------------
aa1f699e	9	*
9155ea97	10	* This file is part of the `fwd' port forwarder.
aa1f699e	11	*
9155ea97	12	* `fwd' is free software; you can redistribute it and/or modify
aa1f699e	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.
206212ca	16	*
9155ea97	17	* `fwd' is distributed in the hope that it will be useful,
aa1f699e	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.
206212ca	21	*
aa1f699e	22	* You should have received a copy of the GNU General Public License
9155ea97	23	* along with `fwd'; if not, write to the Free Software Foundation,
aa1f699e	24	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	25	*/
	26
9155ea97	27	#include "fwd.h"
aa1f699e	28
	29	/----- Data structures ---------------------------------------------------/
	30
	31	typedef struct inet_addrx {
	32	addr a;
	33	struct sockaddr_in sin;
	34	} inet_addrx;
	35
	36	typedef struct inet_opts {
	37	addr_opts ao;
0ac54f22	38	struct in_addr bind;
	39	} inet_opts;
	40
	41	typedef struct inet_srcopts {
	42	inet_opts io;
aa1f699e	43	acl_entry *acl;
aa1f699e	44	acl_entry **acltail;
0ac54f22	45	} inet_srcopts;
	46
	47	typedef struct inet_targopts {
	48	inet_opts io;
ee599f55	49	int ipriv;
0ac54f22	50	} inet_targopts;
0ac54f22	51
ee599f55	52	#define ADDRF_PRIVCONN 16u
ee599f55	53
0ac54f22	54	static inet_srcopts inet_globalsrc =
	55	{ { { 0 }, { INADDR_ANY } }, 0, &inet_globalsrc.acl };
	56	static inet_targopts inet_globaltarg =
	57	{ { { 0 }, { INADDR_ANY } } };
aa1f699e	58
	59	/----- Protocol operations -----------------------------------------------/
	60
	61	/* --- @read@ --- */
	62
	63	static addr inet_read(scanner sc, unsigned type)
	64	{
	65	inet_addrx ia = xmalloc(sizeof(ia));
	66
	67	ia->a.ops = &inet_ops;
	68	ia->a.sz = sizeof(struct sockaddr_in);
e0ce9d38	69	memset(&ia->sin, 0, sizeof(ia->sin));
aa1f699e	70	ia->sin.sin_family = AF_INET;
	71
	72	/* --- Read the host address part --- */
	73
	74	switch (type) {
	75	case ADDR_SRC:
	76	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "port") == 0)
	77	token(sc);
	78	ia->sin.sin_addr.s_addr = htonl(INADDR_ANY);
	79	break;
	80	case ADDR_DEST: {
	81	struct hostent *h;
	82	dstr d = DSTR_INIT;
	83	conf_name(sc, '.', &d);
	84	if ((h = gethostbyname(d.buf)) == 0)
	85	error(sc, "couldn't resolve Internet address `%s'", d.buf);
	86	memcpy(&ia->sin.sin_addr, h->h_addr, sizeof(struct in_addr));
	87	dstr_destroy(&d);
	88	if (sc->t == ':')
	89	token(sc);
	90	} break;
	91	}
	92
	93	/* --- Read the port number --- */
	94
	95	{
	96	struct servent *s;
	97
	98	if (sc->t != CTOK_WORD)
	99	error(sc, "parse error, TCP port expected");
	100	if (isdigit((unsigned char)sc->d.buf[0]))
	101	ia->sin.sin_port = htons(atoi(sc->d.buf));
	102	else if ((s = getservbyname(sc->d.buf, "tcp")) == 0)
	103	error(sc, "unknown tcp service `%s'", sc->d.buf);
	104	else
	105	ia->sin.sin_port = s->s_port;
	106	token(sc);
	107	}
	108
	109	return (&ia->a);
	110	}
	111
	112	/* --- @destroy@ --- */
	113
	114	static void inet_destroy(addr *a)
	115	{
	116	inet_addrx ia = (inet_addrx )a;
	117	DESTROY(ia);
	118	}
	119
	120	/* --- @print@ --- */
	121
	122	static void inet_print(addr a, unsigned type, dstr d)
	123	{
	124	inet_addrx ia = (inet_addrx )a;
	125	switch (type) {
	126	case ADDR_SRC:
	127	dstr_putf(d, "inet:%u", (unsigned)ntohs(ia->sin.sin_port));
	128	break;
	129	case ADDR_DEST:
	130	dstr_putf(d, "inet:%s:%u",
	131	inet_ntoa(ia->sin.sin_addr),
	132	(unsigned)ntohs(ia->sin.sin_port));
	133	break;
134	}
135	}
136
137	/* --- @initopts@ --- */
138
0ac54f22	139	static addr_opts *inet_initsrcopts(void)
aa1f699e	140	{
0ac54f22	141	inet_srcopts *io = CREATE(inet_srcopts);
0ac54f22	142	*io = inet_globalsrc;
aa1f699e	143	io->acl = 0;
aa1f699e	144	io->acltail = &io->acl;
0ac54f22	145	return (&io->io.ao);
	146	}
	147
	148	static addr_opts *inet_inittargopts(void)
	149	{
	150	inet_targopts *io = CREATE(inet_targopts);
	151	*io = inet_globaltarg;
ee599f55	152	io->ipriv = -1;
0ac54f22	153	return (&io->io.ao);
aa1f699e	154	}
	155
	156	/* --- @option@ --- */
	157
0ac54f22	158	static void addropt(scanner sc, inet_opts io)
aa1f699e	159	{
0ac54f22	160	dstr d = DSTR_INIT;
0ac54f22	161	struct hostent *h;
aa1f699e	162
0ac54f22	163	token(sc);
	164	if (sc->t == '=')
	165	token(sc);
	166	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "any") == 0)
	167	io->bind.s_addr = INADDR_ANY;
	168	else {
	169	conf_name(sc, '.', &d);
	170	if ((h = gethostbyname(d.buf)) == 0)
	171	error(sc, "couldn't resolve address `%s'", d.buf);
	172	memcpy(&io->bind, h->h_addr, sizeof(struct in_addr));
	173	}
	174	}
aa1f699e	175
0ac54f22	176	static int srcopt(scanner sc, addr_opts ao)
	177	{
	178	inet_srcopts io = (inet_srcopts )ao;
aa1f699e	179	unsigned act;
aa1f699e	180
0ac54f22	181	CONF_BEGIN(sc, "source", "Internet socket source")
	182
	183	/* --- Initialization --- */
	184
	185	if (!io) {
	186	if (!inet_globalsrc.acltail)
	187	inet_globalsrc.acltail = &inet_globalsrc.acl;
	188	io = &inet_globalsrc;
	189	}
	190
	191	/* --- Source address configuration --- */
	192
	193	if (strcmp(sc->d.buf, "addr") == 0) {
	194	addropt(sc, &io->io);
	195	CONF_ACCEPT;
	196	}
	197
aa1f699e	198	/* --- Access control limitations --- */
	199
	200	if ((strcmp(sc->d.buf, "allow") == 0 && (act = ACL_ALLOW, 1)) \|\|
	201	(strcmp(sc->d.buf, "deny") == 0 && (act = ACL_DENY, 1))) {
	202	struct hostent *h;
	203	struct netent *n;
	204	struct in_addr a, m;
	205	dstr d = DSTR_INIT;
	206
0ac54f22	207	/* --- Find out what's going on --- */
aa1f699e	208
	209	token(sc);
	210	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "from") == 0)
	211	token(sc);
aa1f699e	212
ee599f55	213	if (sc->t == CTOK_WORD && (strcmp(sc->d.buf, "priv") == 0 \|\|
ee599f55	214	strcmp(sc->d.buf, "priv-port") == 0)) {
0ac54f22	215	acl_addpriv(&io->acltail, act);
aa1f699e	216	token(sc);
0ac54f22	217	} else {
	218	if (sc->t == CTOK_WORD && strcmp(sc->d.buf, "host") == 0)
	219	token(sc);
	220
	221	/* --- Find the host or network address --- */
	222
aa1f699e	223	conf_name(sc, '.', &d);
0ac54f22	224	#ifdef HAVE_GETNETBYNAME
	225	if ((n = getnetbyname(d.buf)) != 0)
	226	a.s_addr = htonl(n->n_net);
	227	else
	228	#endif
	229	if ((h = gethostbyname(d.buf)) == 0)
	230	error(sc, "couldn't resolve address `%s'", d.buf);
aa1f699e	231	else
0ac54f22	232	memcpy(&a, h->h_addr, sizeof(struct in_addr));
	233
	234	/* --- Find the netmask, if any --- */
	235
	236	if (sc->t != '/')
c712469b	237	m.s_addr = (in_addr_t)~0ul;
0ac54f22	238	else {
	239	token(sc);
	240	DRESET(&d);
	241	conf_name(sc, '.', &d);
	242	if (strchr(d.buf, '.') == 0) {
	243	int n = atoi(d.buf);
	244	if (n == 0)
	245	m.s_addr = 0;
	246	else
	247	m.s_addr = htonl((~0ul << (32 - n)) & 0xffffffff);
	248	} else {
aa1f699e	249	#ifdef HAVE_INET_ATON
0ac54f22	250	if (!inet_aton(d.buf, &m))
0ac54f22	251	error(sc, "bad netmask `%s'", d.buf);
aa1f699e	252	#else
0ac54f22	253	m.s_addr = inet_addr(d.buf);
aa1f699e	254	#endif
0ac54f22	255	}
aa1f699e	256	}
0ac54f22	257	dstr_destroy(&d);
aa1f699e	258
0ac54f22	259	/* --- Add the access control entry --- */
aa1f699e	260
0ac54f22	261	acl_addhost(&io->acltail, act, a, m);
0ac54f22	262	}
aa1f699e	263	CONF_ACCEPT;
	264	}
	265
	266	/* --- Anything unrecognized --- */
	267
	268	CONF_END;
	269	}
	270
0ac54f22	271	static int targopt(scanner sc, addr_opts ao)
	272	{
	273	inet_targopts io = (inet_targopts )ao;
	274
	275	CONF_BEGIN(sc, "dest", "Internet socket target");
	276	if (strcmp(sc->d.buf, "addr") == 0) {
	277	addropt(sc, &io->io);
	278	CONF_ACCEPT;
	279	}
ee599f55	280	if (strcmp(sc->d.buf, "priv") == 0 \|\|
	281	strcmp(sc->d.buf, "priv-port") == 0) {
	282	token(sc);
	283	if (sc->t == '=') token(sc);
	284	if (conf_enum(sc, "no,yes", ENUM_ABBREV, "privileged connection status"))
	285	io->io.ao.f \|= ADDRF_PRIVCONN;
	286	else
	287	io->io.ao.f &= ~ADDRF_PRIVCONN;
	288	CONF_ACCEPT;
	289	}
0ac54f22	290	CONF_END;
	291	}
	292
	293	static int inet_option(scanner sc, addr_opts ao, unsigned type)
	294	{
	295	CONF_BEGIN(sc, "inet", "Internet socket");
	296	if (type != ADDR_DEST && srcopt(sc, ao))
	297	CONF_ACCEPT;
	298	if (type != ADDR_SRC && targopt(sc, ao))
	299	CONF_ACCEPT;
	300	CONF_END;
	301	}
	302
ee599f55	303	/* --- @confirm@ --- */
	304
	305	static void inet_confirm(addr a, unsigned type, addr_opts ao)
	306	{
	307	inet_addrx ia = (inet_addrx )a;
	308
	309	switch (type) {
	310	case ADDR_DEST: {
	311	inet_targopts io = (inet_targopts )ao;
	312	if ((io->io.ao.f & ADDRF_PRIVCONN) &&
	313	(io->ipriv = privconn_adddest(ia->sin.sin_addr,
	314	ia->sin.sin_port)) < 0)
	315	die(1, "couldn't add privileged connection target (too late)");
	316	} break;
	317	}
	318	}
	319
0ac54f22	320	/* --- @freeopts@ --- */
	321
	322	static void inet_freesrcopts(addr_opts *ao)
	323	{
	324	inet_srcopts io = (inet_srcopts )ao;
	325	acl_free(io->acl);
	326	DESTROY(io);
	327	}
	328
	329	static void inet_freetargopts(addr_opts *ao)
	330	{
	331	inet_targopts io = (inet_targopts )ao;
	332	DESTROY(io);
	333	}
	334
	335	/* --- @bind@ --- */
	336
	337	static int inet_bind(addr a, addr_opts ao)
	338	{
	339	inet_addrx ia = (inet_addrx )a;
	340	inet_srcopts io = (inet_srcopts )ao;
	341	struct sockaddr_in sin;
	342	int opt = 1;
	343	int fd;
	344
	345	if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
	346	goto fail_0;
	347	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
	348	fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
	349	sin = ia->sin;
	350	sin.sin_addr = io->io.bind;
	351	if (bind(fd, (struct sockaddr *)&sin, sizeof(ia->sin)))
	352	goto fail_1;
	353	return (fd);
	354
	355	fail_1:
	356	close(fd);
	357	fail_0:
	358	return (-1);
	359	}
	360
aa1f699e	361	/* --- @accept@ --- */
	362
	363	static reffd inet_accept(int fd, addr_opts ao, const char *desc)
	364	{
0ac54f22	365	inet_srcopts io = (inet_srcopts )ao;
aa1f699e	366	int nfd;
aa1f699e	367	id_req q;
c712469b	368	socklen_t lsinsz = sizeof(q.lsin), rsinsz = sizeof(q.rsin);
0ac54f22	369	int act = ACL_ALLOW;
aa1f699e	370
	371	/* --- Accept the new connection --- */
	372
	373	if ((nfd = accept(fd, (struct sockaddr *)&q.rsin, &rsinsz)) < 0)
	374	return (0);
	375	if (getsockname(nfd, (struct sockaddr *)&q.lsin, &lsinsz)) {
	376	close(nfd);
	377	return (0);
	378	}
	379	q.desc = desc;
	380	q.r = reffd_init(nfd);
	381
	382	/* --- Find out whether this connection is allowed --- */
	383
0ac54f22	384	if (!acl_check(io->acl, q.rsin.sin_addr, ntohs(q.rsin.sin_port), &act))
	385	acl_check(inet_globalsrc.acl, q.rsin.sin_addr,
	386	ntohs(q.rsin.sin_port), &act);
	387	if (act != ACL_ALLOW) {
aa1f699e	388	q.act = "refused";
0ac54f22	389	if (!(io->io.ao.f & ADDRF_NOLOG))
aa1f699e	390	identify(&q);
	391	REFFD_DEC(q.r);
	392	return (0);
	393	}
	394
	395	/* --- Everything seems to be OK --- */
	396
	397	q.act = "accepted";
0ac54f22	398	if (!(io->io.ao.f & ADDRF_NOLOG))
aa1f699e	399	identify(&q);
	400	return (q.r);
	401	}
	402
0ac54f22	403	/* --- @connect@ --- */
aa1f699e	404
0ac54f22	405	static int inet_connect(addr a, addr_opts ao, conn c, endpt e)
aa1f699e	406	{
0ac54f22	407	inet_addrx ia = (inet_addrx )a;
	408	inet_targopts io = (inet_targopts )ao;
	409	int fd;
	410
ee599f55	411	if (io->ipriv >= 0) {
	412	return (privconn_connect(c, sel, io->ipriv, io->io.bind,
	413	starget_connected, e));
	414	}
0ac54f22	415	if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
	416	goto fail_0;
	417	if (io->io.bind.s_addr != INADDR_ANY) {
	418	struct sockaddr_in sin;
	419	memset(&sin, 0, sizeof(sin));
	420	sin.sin_family = AF_INET;
	421	sin.sin_addr = io->io.bind;
	422	sin.sin_port = 0;
	423	if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
	424	goto fail_1;
	425	}
	426	fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
	427	return (conn_init(c, sel, fd, (struct sockaddr *)&ia->sin, sizeof(ia->sin),
	428	starget_connected, e));
	429	fail_1:
	430	close(fd);
	431	fail_0:
	432	return (-1);
aa1f699e	433	}
	434
	435	/* --- Ops table --- */
	436
	437	addr_ops inet_ops = {
0ac54f22	438	"inet",
aa1f699e	439	inet_read, inet_destroy, inet_print,
ee599f55	440	inet_initsrcopts, inet_option, inet_confirm, inet_freesrcopts,
0ac54f22	441	inet_bind, 0, inet_accept,
0ac54f22	442	inet_inittargopts, inet_freetargopts,
206212ca	443	inet_connect
aa1f699e	444	};
	445
	446	/----- That's all, folks -------------------------------------------------/