netsukuku/src/inet.c

/* This file is part of Netsukuku
 * (c) Copyright 2005 Andrea Lo Pumo aka AlpT <alpt@freaknet.org>
 *
 * This source code 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.
 *
 * This source code 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.
 * Please refer to the GNU Public License for more details.
 *
 * You should have received a copy of the GNU Public License along with
 * this source code; if not, write to:
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "includes.h"

#include "common.h"
#include "ipv6-gmp.h"
#include "libnetlink.h"
#include "ll_map.h"
#include "inet.h"
#include "endianness.h"


/*
 * inet_ntohl: Converts each element of `data' from network to host order. If
 * `family' is equal to AF_INET6, the array is swapped too (on big endian
 * machine).
 */
void
inet_ntohl(u_int * data, int family)
{
#if BYTE_ORDER == LITTLE_ENDIAN
	if (family == AF_INET) {
		data[0] = ntohl(data[0]);
	} else {
		int i;
		swap_ints(MAX_IP_INT, data, data);
		for (i = 0; i < MAX_IP_INT; i++)
			data[i] = ntohl(data[i]);
	}
#endif
}

/*
 * inet_htonl: Converts each element of `data' from host to network order. If
 * `family' is equal to AF_INET6, the array is swapped too (on big endian
 * machine).
 */
void
inet_htonl(u_int * data, int family)
{
#if BYTE_ORDER == LITTLE_ENDIAN
	if (family == AF_INET) {
		data[0] = htonl(data[0]);
	} else {
		int i;
		swap_ints(MAX_IP_INT, data, data);
		for (i = 0; i < MAX_IP_INT; i++)
			data[i] = htonl(data[i]);
	}
#endif
}

/*
 * inet_setip_raw: fills the `ip' inet_prefix struct with `data' and `family'.
 */
int
inet_setip_raw(inet_prefix * ip, u_int * data, int family)
{
	ip->family = family;
	setzero(ip->data, sizeof(ip->data));

	if (family == AF_INET) {
		ip->data[0] = data[0];
		ip->len = 4;
	} else if (family == AF_INET6) {
		memcpy(ip->data, data, sizeof(ip->data));
		ip->len = 16;
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	ip->bits = ip->len << 3;	/* bits=len*8 */

	return 0;
}


/*
 * inet_setip: fills the `ip' inet_prefix struct with `data' and `family'.
 * Note that it does a network to host order conversion on `data'.
 */
int
inet_setip(inet_prefix * ip, u_int * data, int family)
{
	inet_setip_raw(ip, data, family);
	inet_ntohl(ip->data, ip->family);
	return 0;
}

int
inet_setip_bcast(inet_prefix * ip, int family)
{
	if (family == AF_INET) {
		u_int data[MAX_IP_INT] = { 0, 0, 0, 0 };
		data[0] = INADDR_BROADCAST;
		inet_setip(ip, data, family);
	} else if (family == AF_INET6) {
		u_int data[MAX_IP_INT] = IPV6_ADDR_BROADCAST;
		inet_setip(ip, data, family);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	return 0;
}

int
inet_setip_anyaddr(inet_prefix * ip, int family)
{
	if (family == AF_INET) {
		u_int data[MAX_IP_INT] = { 0, 0, 0, 0 };

		data[0] = INADDR_ANY;
		inet_setip(ip, data, family);
	} else if (family == AF_INET6) {
		struct in6_addr ipv6 = IN6ADDR_ANY_INIT;
		inet_setip(ip, (u_int *) (&ipv6), family);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	return 0;
}

int
inet_setip_loopback(inet_prefix * ip, int family)
{
	if (family == AF_INET) {
		u_int data[MAX_IP_INT] = { 0, 0, 0, 0 };

		data[0] = LOOPBACK_IP;
		inet_setip(ip, data, family);
		inet_htonl(ip->data, ip->family);
	} else if (family == AF_INET6) {
		u_int data[MAX_IP_INT] = LOOPBACK_IPV6;
		inet_setip(ip, data, family);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	return 0;
}

/*
 * inet_setip_localaddr: Restrict the `ip' to a local private class changing the
 * first byte of the `ip'. `class' specifies what restricted class is currently
 * being used (10.x.x.x or 172.16.x.x). In ipv6 the site local class is the
 * default.
 */
int
inet_setip_localaddr(inet_prefix * ip, int family, int class)
{
	if (family == AF_INET) {
		if (class == RESTRICTED_10)
			ip->data[0] = NTK_RESTRICTED_10_MASK(ip->data[0]);
		else
			ip->data[0] = NTK_RESTRICTED_172_MASK(ip->data[0]);
	} else if (family == AF_INET6) {
		ip->data[0] = NTK_RESTRICTED_IPV6_MASK(ip->data[0]);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	return 0;
}

/*
 * inet_is_ip_local: verifies if `ip' is a local address. If it is, 1 is
 * returned. `class' specifies what restricted class is currently
 * being used (10.x.x.x or 172.16.x.x). In ipv6 the site local class is the
 * default.
 */
int
inet_is_ip_local(inet_prefix * ip, int class)
{
	if (ip->family == AF_INET) {
		if (class == RESTRICTED_10)
			return ip->data[0] == NTK_RESTRICTED_10_MASK(ip->data[0]);
		else
			return ip->data[0] == NTK_RESTRICTED_172_MASK(ip->data[0]);
	} else if (ip->family == AF_INET6)
		return ip->data[0] == NTK_RESTRICTED_IPV6_MASK(ip->data[0]);
	else
		fatal(ERROR_MSG "family not supported", ERROR_POS);
	return 0;
}

void
inet_copy(inet_prefix * dst, inet_prefix * src)
{
	memcpy(dst, src, sizeof(inet_prefix));
}

/*
 * inet_copy_ipdata_raw: copies `ip'->data in `dst_data'.
 */
void
inet_copy_ipdata_raw(u_int * dst_data, inet_prefix * ip)
{
	memcpy(dst_data, ip->data, MAX_IP_SZ);
}

/*
 * inet_copy_ipdata: copies `ip'->data in `dst_data' and converts it in network
 * order.
 */
void
inet_copy_ipdata(u_int * dst_data, inet_prefix * ip)
{
	inet_prefix tmp_ip;

	inet_copy(&tmp_ip, ip);
	inet_htonl(tmp_ip.data, tmp_ip.family);
	memcpy(dst_data, tmp_ip.data, MAX_IP_SZ);
}

/*
 * pack_inet_prefix: packs the `ip' inet_prefix struct and stores it in
 * `pack', which must be INET_PREFIX_PACK_SZ bytes big. `pack' will be in
 * network order.
 */
void
pack_inet_prefix(inet_prefix * ip, char *pack)
{
	char *buf;

	buf = pack;

	memcpy(buf, &ip->family, sizeof(u_char));
	buf += sizeof(u_char);

	memcpy(buf, &ip->len, sizeof(u_short));
	buf += sizeof(u_short);

	memcpy(buf, &ip->bits, sizeof(u_char));
	buf += sizeof(u_char);

	memcpy(buf, ip->data, MAX_IP_SZ);
	inet_htonl((u_int *) buf, ip->family);
	buf += MAX_IP_SZ;

	ints_host_to_network(pack, inet_prefix_iinfo);
}

/*
 * unpack_inet_prefix: restores in `ip' the inet_prefix struct contained in `pack'.
 * Note that `pack' will be modified during the restoration.
 */
void
unpack_inet_prefix(inet_prefix * ip, char *pack)
{
	char *buf;

	buf = pack;

	ints_network_to_host(pack, inet_prefix_iinfo);

	memcpy(&ip->family, buf, sizeof(u_char));
	buf += sizeof(u_char);

	memcpy(&ip->len, buf, sizeof(u_short));
	buf += sizeof(u_short);

	memcpy(&ip->bits, buf, sizeof(u_char));
	buf += sizeof(u_char);

	memcpy(ip->data, buf, MAX_IP_SZ);
	inet_ntohl(ip->data, ip->family);
	buf += MAX_IP_SZ;
}

/*
 * inet_addr_match: without hesitating this function was robbed from iproute2.
 * It compares a->data wih b->data matching `bits'# bits.
 */
int
inet_addr_match(const inet_prefix * a, const inet_prefix * b, int bits)
{
	const uint32_t *a1 = a->data;
	const uint32_t *a2 = b->data;
	int words = bits >> 0x05;

	bits &= 0x1f;

	if (words)
		if (memcmp(a1, a2, words << 2))
			return -1;

	if (bits) {
		uint32_t w1, w2;
		uint32_t mask;

		w1 = a1[words];
		w2 = a2[words];

		mask = htonl((0xffffffff) << (0x20 - bits));

		if ((w1 ^ w2) & mask)
			return 1;
	}

	return 0;
}

int
ipv6_addr_type(inet_prefix addr)
{
	int type;
	u_int st;

	st = htonl(addr.data[0]);

	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
		type = IPV6_ADDR_MULTICAST;

		switch ((st & htonl(0x00FF0000))) {
		case __constant_htonl(0x00010000):
			type |= IPV6_ADDR_LOOPBACK;
			break;

		case __constant_htonl(0x00020000):
			type |= IPV6_ADDR_LINKLOCAL;
			break;

		case __constant_htonl(0x00050000):
			type |= IPV6_ADDR_SITELOCAL;
			break;
		};
		return type;
	}

	type = IPV6_ADDR_UNICAST;

	/* Consider all addresses with the first three bits different of
	   000 and 111 as finished.
	 */
	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
		(st & htonl(0xE0000000)) != htonl(0xE0000000))
		return type;

	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
		return (IPV6_ADDR_LINKLOCAL | type);

	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
		return (IPV6_ADDR_SITELOCAL | type);

	if ((addr.data[0] | addr.data[1]) == 0) {
		if (addr.data[2] == 0) {
			if (addr.data[3] == 0)
				return IPV6_ADDR_ANY;

			if (htonl(addr.data[3]) == htonl(0x00000001))
				return (IPV6_ADDR_LOOPBACK | type);

			return (IPV6_ADDR_COMPATv4 | type);
		}

		if (htonl(addr.data[2]) == htonl(0x0000ffff))
			return IPV6_ADDR_MAPPED;
	}

	st &= htonl(0xFF000000);
	if (st == 0)
		return IPV6_ADDR_RESERVED;
	st &= htonl(0xFE000000);
	if (st == htonl(0x02000000))
		return IPV6_ADDR_RESERVED;	/* for NSAP */
	if (st == htonl(0x04000000))
		return IPV6_ADDR_RESERVED;	/* for IPX */
	return type;
}

/*
 * inet_validate_ip: returns 0 is `ip' a valid IP which can be set by
 * Netsukuku to a network interface
 */
int
inet_validate_ip(inet_prefix ip)
{
	int type, ipv4;

	if (ip.family == AF_INET) {
		ipv4 = htonl(ip.data[0]);
		if (MULTICAST(ipv4) || BADCLASS(ipv4) || ZERONET(ipv4)
			|| LOOPBACK(ipv4) || NTK_PRIVATE_C(ipv4) ||
			(!restricted_mode && NTK_PRIVATE_B(ipv4)))
			return -EINVAL;

	} else if (ip.family == AF_INET6) {
		type = ipv6_addr_type(ip);
		if ((type & IPV6_ADDR_MULTICAST) || (type & IPV6_ADDR_RESERVED) ||
			(type & IPV6_ADDR_LOOPBACK))
			return -EINVAL;
	}

	if (is_bufzero((char *) ip.data, MAX_IP_SZ))
		return -EINVAL;

	return 0;
}


/*\
 *
 *  *  *  Conversion functions...  *  *
 *
\*/

/*
 * ipraw_to_str: It returns the string which represents the given ip in host
 * order.
 */
const char *
ipraw_to_str(u_int ip[MAX_IP_INT], int family)
{
	struct in_addr src;
	struct in6_addr src6;
	static char dst[INET_ADDRSTRLEN], dst6[INET6_ADDRSTRLEN];

	if (family == AF_INET) {
		src.s_addr = htonl(ip[0]);
		inet_ntop(family, &src, dst, INET_ADDRSTRLEN);

		return dst;
	} else if (family == AF_INET6) {
		inet_htonl(ip, family);
		memcpy(&src6, ip, MAX_IP_SZ);
		inet_ntop(family, &src6, dst6, INET6_ADDRSTRLEN);

		return dst6;
	}

	return 0;
}

/*
 * inet_to_str: returns the string rapresentation of `ip'
 */
const char *
inet_to_str(inet_prefix ip)
{
	return ipraw_to_str(ip.data, ip.family);
}

/*
 * str_to_inet: it converts the IP address string contained in `src' and
 * terminated by a `\0' char to an inet_prefix struct. The result is stored in
 * `ip'. On error -1 is returned.
 */
int
str_to_inet(const char *src, inet_prefix * ip)
{
	struct in_addr dst;
	struct in6_addr dst6;
	int family, res;
	u_int *data;

	setzero(ip, sizeof(inet_prefix));

	if (strstr(src, ":")) {
		family = AF_INET6;
		data = (u_int *) & dst6;
	} else {
		family = AF_INET;
		data = (u_int *) & dst;
	}

	if ((res = inet_pton(family, src, (void *) data)) < 0) {
		debug(DBG_NORMAL, ERROR_MSG "error -> %s.",
			  ERROR_FUNC, strerror(errno));
		return -1;
	}
	if (!res) {
		debug(DBG_NORMAL, ERROR_MSG "impossible to convert \"%s\":"
			  " invalid address.", ERROR_FUNC, src);
		return -1;
	}

	inet_setip(ip, data, family);
	return 0;
}

/*
 * inet_to_sockaddr: Converts a inet_prefix struct to a sockaddr struct
 */
int
inet_to_sockaddr(inet_prefix * ip, u_short port, struct sockaddr *dst,
				 socklen_t * dstlen)
{
	port = htons(port);

	if (ip->family == AF_INET) {
		struct sockaddr_in sin;
		setzero(&sin, sizeof(struct sockaddr_in));

		sin.sin_family = ip->family;
		sin.sin_port = port;
		sin.sin_addr.s_addr = htonl(ip->data[0]);
		memcpy(dst, &sin, sizeof(struct sockaddr_in));

		if (dstlen)
			*dstlen = sizeof(struct sockaddr_in);

	} else if (ip->family == AF_INET6) {
		struct sockaddr_in6 sin6;
		setzero(&sin6, sizeof(struct sockaddr_in6));

		sin6.sin6_family = ip->family;
		sin6.sin6_port = port;
		sin6.sin6_flowinfo = 0;

		memcpy(&sin6.sin6_addr, ip->data, MAX_IP_SZ);
		inet_htonl((u_int *) & sin6.sin6_addr, ip->family);

		memcpy(dst, &sin6, sizeof(struct sockaddr_in6));

		if (dstlen)
			*dstlen = sizeof(struct sockaddr_in6);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	return 0;
}

int
sockaddr_to_inet(struct sockaddr *ip, inet_prefix * dst, u_short * port)
{
	u_short po;
	char *p;

	setzero(dst, sizeof(inet_prefix));

	dst->family = ip->sa_family;
	memcpy(&po, &ip->sa_data, sizeof(u_short));
	if (port)
		*port = ntohs(po);

	if (ip->sa_family == AF_INET)
		p = (char *) ip->sa_data + sizeof(u_short);
	else if (ip->sa_family == AF_INET6)
		p = (char *) ip->sa_data + sizeof(u_short) + sizeof(int);
	else {
		error(ERROR_MSG "family not supported", ERROR_POS);
		return -1;
	}

	inet_setip(dst, (u_int *) p, ip->sa_family);

	return 0;
}

/*\
 *
 *   *  *  Socket operations  *  *
 *
\*/

int
new_socket(int sock_type)
{
	int sockfd;
	if ((sockfd = socket(sock_type, SOCK_STREAM, 0)) == -1) {
		error("Socket SOCK_STREAM creation failed: %s", strerror(errno));
		return -1;
	}

	return sockfd;
}

int
new_dgram_socket(int sock_type)
{
	int sockfd;
	if ((sockfd = socket(sock_type, SOCK_DGRAM, 0)) == -1) {
		error("Socket SOCK_DGRAM creation failed: %s", strerror(errno));
		return -1;
	}

	return sockfd;
}

/*
 * inet_close
 *
 * It closes the `*sk' socket and sets it to zero.
 * It always returns 0;
 */
int
inet_close(int *sk)
{
	close(*sk);
	return (*sk = 0);
}

int
inet_getpeername(int sk, inet_prefix * ip, short *port)
{
	struct sockaddr_storage saddr_sto;
	struct sockaddr *sa = (struct sockaddr *) &saddr_sto;
	socklen_t alen;

	alen = sizeof(saddr_sto);
	setzero(sa, alen);
	if (getpeername(sk, sa, &alen) == -1) {
		error("Cannot getpeername: %s", strerror(errno));
		return -1;
	}

	return sockaddr_to_inet(sa, ip, port);
}

/*
 * join_ipv6_multicast: It adds the membership to the IPV6_ADDR_BROADCAST
 * multicast group. The device with index `idx' will be used.
 */
int
join_ipv6_multicast(int socket, int idx)
{
	struct ipv6_mreq mreq6;
	const int addr[MAX_IP_INT] = IPV6_ADDR_BROADCAST;

	setzero(&mreq6, sizeof(struct ipv6_mreq));
	memcpy(&mreq6.ipv6mr_multiaddr, addr, sizeof(struct in6_addr));
	mreq6.ipv6mr_interface = idx;

	if (setsockopt(socket, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
				   sizeof(mreq6)) < 0) {
		error("Cannot set IPV6_JOIN_GROUP: %s", strerror(errno));
		close(socket);
		return -1;
	}

	return socket;
}

int
set_multicast_if(int socket, int idx)
{
	/* man ipv6 */

	if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_IF,
				   &idx, sizeof(int)) < 0) {
		error("set_multicast_if(): cannot set IPV6_MULTICAST_IF: %s",
			  strerror(errno));
		close(socket);
		return -1;
	}

	return 0;
}

int
set_nonblock_sk(int fd)
{
	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
		error("set_nonblock_sk(): cannot set O_NONBLOCK: %s",
			  strerror(errno));
		close(fd);
		return -1;
	}
	return 0;
}

int
unset_nonblock_sk(int fd)
{
	if (fcntl(fd, F_SETFL, 0) < 0) {
		error("unset_nonblock_sk(): cannot unset O_NONBLOCK: %s",
			  strerror(errno));
		close(fd);
		return -1;
	}
	return 0;
}

int
set_reuseaddr_sk(int socket)
{
	int reuseaddr = 1, ret;
	/*
	 * SO_REUSEADDR: <<Go ahead and reuse that port even if it is in
	 * TIME_WAIT state.>>
	 */
	ret =
		setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
				   sizeof(int));
	if (ret < 0)
		error("setsockopt SO_REUSEADDR: %s", strerror(errno));
	return ret;
}

int
set_bindtodevice_sk(int socket, char *dev)
{
	struct ifreq ifr;
	int ret = 0;

	setzero(&ifr, sizeof(ifr));
	strncpy(ifr.ifr_name, dev, IFNAMSIZ - 1);

	ret =
		setsockopt(socket, SOL_SOCKET, SO_BINDTODEVICE, dev,
				   strlen(dev) + 1);
	if (ret < 0)
		error("setsockopt SO_BINDTODEVICE: %s", strerror(errno));

	return ret;
}

/*
 * `loop': 0 = disable, 1 = enable (default)
 */
int
set_multicast_loop_sk(int family, int socket, u_char loop)
{
	int ret = 0;

	/*
	 * <<The IPV6_MULTICAST_LOOP option gives the sender explicit control
	 * over whether or not subsequent datagrams are looped bac.>>
	 */
	if (family == AF_INET6)
		ret =
			setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop,
					   sizeof(loop));
	if (ret < 0)
		error("setsockopt IP_MULTICAST_LOOP: %s", strerror(errno));
	return ret;
}

int
set_broadcast_sk(int socket, int family, inet_prefix * host, short port,
				 int dev_idx)
{
	struct sockaddr_storage saddr_sto;
	struct sockaddr *sa = (struct sockaddr *) &saddr_sto;
	socklen_t alen;
	int broadcast = 1;

	if (family == AF_INET) {
		if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, &broadcast,
					   sizeof(broadcast)) < 0) {
			error("Cannot set SO_BROADCAST to socket: %s",
				  strerror(errno));
			close(socket);
			return -1;
		}
	} else if (family == AF_INET6) {
		if (join_ipv6_multicast(socket, dev_idx) < 0)
			return -1;
		if (set_multicast_loop_sk(family, socket, 0) < 0)
			return -1;
		set_multicast_if(socket, dev_idx);
	} else
		fatal(ERROR_MSG "family not supported", ERROR_POS);

	/* What's my name ? */
	alen = sizeof(saddr_sto);
	setzero(sa, alen);
	if (getsockname(socket, sa, &alen) == -1) {
		error("Cannot getsockname: %s", strerror(errno));
		close(socket);
		return -1;
	}

	/* Let's bind it! */
	if (bind(socket, sa, alen) < 0) {
		error("Cannot bind the broadcast socket: %s", strerror(errno));
		close(socket);
		return -1;
	}

	return socket;
}

int
unset_broadcast_sk(int socket, int family)
{
	int broadcast = 0;
	if (family == AF_INET) {
		if (setsockopt
			(socket, SOL_SOCKET, SO_BROADCAST, &broadcast,
			 sizeof(broadcast)) < 0) {
			error("Cannot unset broadcasting: %s", strerror(errno));
			return -1;
		}
	}
	return 0;
}

int
set_keepalive_sk(int socket)
{
	int on = 1;

	if (setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE, (void *) &on,
				   sizeof(on)) < 0) {
		error("Cannot set keepalive socket: %s", strerror(errno));
		return -1;
	}
	return 0;
}

int
unset_keepalive_sk(int socket)
{
	int off = 0;

	if (setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE, (void *) &off,
				   sizeof(off)) < 0) {
		error("Cannot unset keepalive socket: %s", strerror(errno));
		return -1;
	}
	return 0;
}

int
set_tos_sk(int socket, int lowdelay)
{
	int tos = lowdelay ? IPTOS_LOWDELAY : IPTOS_THROUGHPUT;

	/* Only for Ipv4 */
	if (setsockopt(socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
		error("setsockopt IP_TOS %d: %s", tos, strerror(errno));
		return -1;
	}

	return 0;
}

/*\
 *
 *   *  *  Connection functions  *  *
 *
\*/

int
new_tcp_conn(inet_prefix * host, short port, char *dev)
{
	int sk;
	socklen_t sa_len;
	struct sockaddr_storage saddr_sto;
	struct sockaddr *sa = (struct sockaddr *) &saddr_sto;
	const char *ntop;
	ntop = inet_to_str(*host);

	if (inet_to_sockaddr(host, port, sa, &sa_len)) {
		error("Cannot new_tcp_connect(): %d Family not supported",
			  host->family);
		ERROR_FINISH(sk, -1, finish);
	}

	if ((sk = new_socket(host->family)) == -1)
		ERROR_FINISH(sk, -1, finish);

	if (dev)					/* if `dev' is not null bind the socket to it */
		if (set_bindtodevice_sk(sk, dev) < 0)
			ERROR_FINISH(sk, -1, finish);

	if (connect(sk, sa, sa_len) == -1) {
		error("Cannot tcp_connect() to %s: %s", ntop, strerror(errno));
		ERROR_FINISH(sk, -1, finish);
	}
  finish:
	return sk;
}

int
new_udp_conn(inet_prefix * host, short port, char *dev)
{
	int sk;
	socklen_t sa_len;
	struct sockaddr_storage saddr_sto;
	struct sockaddr *sa = (struct sockaddr *) &saddr_sto;
	const char *ntop;
	ntop = inet_to_str(*host);

	if (inet_to_sockaddr(host, port, sa, &sa_len)) {
		error("Cannot new_udp_connect(): %d Family not supported",
			  host->family);
		ERROR_FINISH(sk, -1, finish);
	}

	if ((sk = new_dgram_socket(host->family)) == -1)
		ERROR_FINISH(sk, -1, finish);

	if (dev)					/* if `dev' is not null bind the socket to it */
		if (set_bindtodevice_sk(sk, dev) < 0)
			ERROR_FINISH(sk, -1, finish);

	if (connect(sk, sa, sa_len) == -1) {
		error("Cannot connect to %s: %s", ntop, strerror(errno));
		ERROR_FINISH(sk, -1, finish);
	}

  finish:
	return sk;
}

int
new_bcast_conn(inet_prefix * host, short port, int dev_idx)
{
	struct sockaddr_storage saddr_sto;
	struct sockaddr *sa = (struct sockaddr *) &saddr_sto;
	socklen_t alen;
	int sk;
	const char *ntop;

	if ((sk = new_dgram_socket(host->family)) == -1)
		return -1;
	sk = set_broadcast_sk(sk, host->family, host, port, dev_idx);

	/*
	 * Connect
	 */
	if (inet_to_sockaddr(host, port, sa, &alen)) {
		error("set_broadcast_sk: %d Family not supported", host->family);
		return -1;
	}

	if (host->family == AF_INET6) {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) sa;
		sin6->sin6_scope_id = dev_idx;
	}

	if (set_bindtodevice_sk(sk, (char *) ll_index_to_name(dev_idx)) < 0)
		return -1;

	if (connect(sk, sa, alen) == -1) {
		ntop = inet_to_str(*host);
		error("Cannot connect to the broadcast (%s): %s", ntop,
			  strerror(errno));
		return -1;
	}

	return sk;
}


/*\
 *
 *   *  *  Recv/Send functions  *  *
 *
\*/

ssize_t
inet_recv(int s, void *buf, size_t len, int flags)
{
	ssize_t err;

	if ((err = recv(s, buf, len, flags)) == -1) {
		switch (errno) {
		default:
			/* Probably connection was closed */
			debug(DBG_NORMAL, "inet_recv: Cannot recv(): %s",
				  strerror(errno));
			return err;
			break;
		}
	}
	return err;
}

/*
 * inet_recv_timeout
 *
 * is the same as inet_recv() but if no reply is received for `timeout'
 * seconds it returns -1.
 */
ssize_t
inet_recv_timeout(int s, void *buf, size_t len, int flags, u_int timeout)
{
	struct timeval timeout_t;
	fd_set fdset;
	int ret;

	MILLISEC_TO_TV(timeout * 1000, timeout_t);

	FD_ZERO(&fdset);
	FD_SET(s, &fdset);

	ret = select(s + 1, &fdset, NULL, NULL, &timeout_t);
	if (ret == -1) {
		error(ERROR_MSG "select error: %s", ERROR_FUNC, strerror(errno));
		return ret;
	}

	return FD_ISSET(s, &fdset) ? inet_recv(s, buf, len, flags) : -1;
}

ssize_t
inet_recvfrom(int s, void *buf, size_t len, int flags,
			  struct sockaddr * from, socklen_t * fromlen)
{
	ssize_t err;

	if ((err = recvfrom(s, buf, len, flags, from, fromlen)) < 0) {
		switch (errno) {
		default:
			error("inet_recvfrom: Cannot recv(): %s", strerror(errno));
			return err;
			break;
		}
	}
	return err;
}

/*
 * inet_recvfrom_timeout: is the same as inet_recvfrom() but if no reply is
 * received for `timeout' seconds it returns -1.
 */
ssize_t
inet_recvfrom_timeout(int s, void *buf, size_t len, int flags,
					  struct sockaddr * from, socklen_t * fromlen,
					  u_int timeout)
{
	struct timeval timeout_t;
	fd_set fdset;
	int ret;

	MILLISEC_TO_TV(timeout * 1000, timeout_t);

	FD_ZERO(&fdset);
	FD_SET(s, &fdset);

	ret = select(s + 1, &fdset, NULL, NULL, &timeout_t);
	if (ret == -1) {
		error(ERROR_MSG "select error: %s", ERROR_FUNC, strerror(errno));
		return ret;
	}

	if (FD_ISSET(s, &fdset))
		return inet_recvfrom(s, buf, len, flags, from, fromlen);

	return -1;
}

ssize_t
inet_send(int s, const void *msg, size_t len, int flags)
{
	ssize_t err;

	if((err=send(s, msg, len, flags)) < 0) {
		switch(errno)
		{
			/* This divides the length of a packet if it is too large to send,
			* it then sends the first half, And then the second half.
			* If it is too large to send again, When it tries to send the first half
			* it will just come back here to repeat the process as needed. */
			case EMSGSIZE:
				inet_send(s, msg, len/2, flags);
				err=inet_send(s, (const char *)msg+(len/2),
						len-(len/2), flags);
				break;

			default:
				error("inet_send: Cannot send(): %s", strerror(errno));
				return err;
				break;
		}
	}
	return err;
}

/*
 * inet_send_timeout: is the same as inet_send() but if the packet isn't sent
 * in `timeout' seconds it timeouts and returns -1.
 */
ssize_t
inet_send_timeout(int s, const void *msg, size_t len, int flags,
				  u_int timeout)
{
	struct timeval timeout_t;
	fd_set fdset;
	int ret;

	MILLISEC_TO_TV(timeout * 1000, timeout_t);

	FD_ZERO(&fdset);
	FD_SET(s, &fdset);

	ret = select(s + 1, NULL, &fdset, NULL, &timeout_t);

	if (ret == -1) {
		error(ERROR_MSG "select error: %s", ERROR_FUNC, strerror(errno));
		return ret;
	}

	if (FD_ISSET(s, &fdset))
		return inet_send(s, msg, len, flags);
	return -1;
}



ssize_t
inet_sendto(int s, const void *msg, size_t len, int flags,
			const struct sockaddr * to, socklen_t tolen)
{
	ssize_t err;
	if ((err = sendto(s, msg, len, flags, to, tolen)) == -1) {
		switch (errno) {
		case EMSGSIZE:
				inet_sendto(s, msg, len/2, flags, to, tolen);
				err=inet_sendto(s, (const char *)msg+(len/2),
						len-(len/2), flags, to, tolen);
			break;
		case EFAULT:
                    
                    char ipv4_addr;
                    
			error("To Family is: %hu "
                                "To Data is: %s "
                                "and: %s", to->sa_family, 
                                inet_ntop(to->sa_family,
                                &(((struct sockaddr_in*)to)->sin_addr),
                                ipv4_addr, sizeof ipv4_addr),
                                strerror(errno));
		default:
			error("inet_sendto: Cannot send(): %s", strerror(errno));
			return err;
			break;
		}

	}
	return err;
}

/*
 * inet_sendto_timeout: is the same as inet_sendto() but if the packet isn't sent
 * in `timeout' seconds it timeouts and returns -1.
 */
ssize_t
inet_sendto_timeout(int s, const void *msg, size_t len, int flags,
					const struct sockaddr * to, socklen_t tolen,
					u_int timeout)
{
	struct timeval timeout_t;
	fd_set fdset;
	int ret;

	MILLISEC_TO_TV(timeout * 1000, timeout_t);

	FD_ZERO(&fdset);
	FD_SET(s, &fdset);

	ret = select(s + 1, NULL, &fdset, NULL, &timeout_t);

	if (ret == -1) {
		error(ERROR_MSG "select error: %s", ERROR_FUNC, strerror(errno));
		return ret;
	}

	if (FD_ISSET(s, &fdset))
		return inet_sendto(s, msg, len, flags, to, tolen);
	return -1;
}


ssize_t
inet_sendfile(int out_fd, int in_fd, off_t * offset, size_t count)
{
	ssize_t err;

	if ((err = sendfile(out_fd, in_fd, offset, count)) == -1)
		error("inet_sendfile: Cannot sendfile(): %s", strerror(errno));
	return err;
}