tincd/raw_socket/device.c

/*
    device.c -- raw socket
    Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
                  2002-2004 Guus Sliepen <guus@tinc-vpn.org>

    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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: device.c 1405 2004-11-08 22:11:33Z guus $
*/

#include <netpacket/packet.h>
#include <netinet/ether.h>

int device_fd = -1;
char *device;
char *iface;
char ifrname[IFNAMSIZ];
char *device_info;

static int device_total_in = 0;
static int device_total_out = 0;

bool setup_device(void)
{
        struct ifreq ifr;
        struct sockaddr_ll sa;

        cp();

        if(!get_config_string
                  (lookup_config(config_tree, "Interface"), &iface))
                iface = "eth0";

        if(!get_config_string(lookup_config(config_tree, "Device"), &device))
                device = iface;

        device_info = _("raw socket");

        if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
                logger(LOG_ERR, _("Could not open %s: %s"), device_info,
                           strerror(errno));
                return false;
        }

        memset(&ifr, 0, sizeof(ifr));
        strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
        if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
                close(device_fd);
                logger(LOG_ERR, _("Can't find interface %s: %s"), iface,
                           strerror(errno));
                return false;
        }

        memset(&sa, '0', sizeof(sa));
        sa.sll_family = AF_PACKET;
        sa.sll_protocol = htons(ETH_P_ALL);
        sa.sll_ifindex = ifr.ifr_ifindex;

        if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) {
                logger(LOG_ERR, _("Could not bind %s to %s: %s"), device, iface, strerror(errno));
                return false;
        }

        logger(LOG_INFO, _("%s is a %s"), device, device_info);

        return true;
}

void close_device(void)
{
        cp();

        close(device_fd);
}

bool read_packet(vpn_packet_t *packet)
{
        int lenin;

        cp();

        if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
                logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
                           device, strerror(errno));
                return false;
        }

        packet->len = lenin;

        device_total_in += packet->len;

        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
                           device_info);

        return true;
}

bool write_packet(vpn_packet_t *packet)
{
        cp();

        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
                           packet->len, device_info);

        if(write(device_fd, packet->data, packet->len) < 0) {
                logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
                           strerror(errno));
                return false;
        }

        device_total_out += packet->len;

        return true;
}

void dump_device_stats(void)
{
        cp();

        logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
        logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
        logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
}
Revision:	1.2
Committed:	Thu Mar 17 23:59:38 2005 UTC (21 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_9, rel-1_8, rel-2_01, rel-3_0, rel-2_2, rel-2_0, rel-2_21, rel-2_22, rel-2_25, HEAD
Changes since 1.1:	+13 -27 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.c -- raw socket
3	pcg	1.2	Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
4			2002-2004 Guus Sliepen <guus@tinc-vpn.org>
5	pcg	1.1
6			This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10
11			This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15
16			You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20	pcg	1.2	$Id: device.c 1405 2004-11-08 22:11:33Z guus $
21	pcg	1.1	*/
22
23			#include <netpacket/packet.h>
24	pcg	1.2	#include <netinet/ether.h>
25	pcg	1.1
26			int device_fd = -1;
27			char *device;
28	pcg	1.2	char *iface;
29	pcg	1.1	char ifrname[IFNAMSIZ];
30			char *device_info;
31
32	pcg	1.2	static int device_total_in = 0;
33			static int device_total_out = 0;
34	pcg	1.1
35			bool setup_device(void)
36			{
37			struct ifreq ifr;
38			struct sockaddr_ll sa;
39
40			cp();
41
42			if(!get_config_string
43	pcg	1.2	(lookup_config(config_tree, "Interface"), &iface))
44			iface = "eth0";
45	pcg	1.1
46			if(!get_config_string(lookup_config(config_tree, "Device"), &device))
47	pcg	1.2	device = iface;
48	pcg	1.1
49			device_info = _("raw socket");
50
51			if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
52			logger(LOG_ERR, _("Could not open %s: %s"), device_info,
53			strerror(errno));
54			return false;
55			}
56
57			memset(&ifr, 0, sizeof(ifr));
58	pcg	1.2	strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
59	pcg	1.1	if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
60			close(device_fd);
61	pcg	1.2	logger(LOG_ERR, _("Can't find interface %s: %s"), iface,
62	pcg	1.1	strerror(errno));
63			return false;
64			}
65
66			memset(&sa, '0', sizeof(sa));
67			sa.sll_family = AF_PACKET;
68			sa.sll_protocol = htons(ETH_P_ALL);
69			sa.sll_ifindex = ifr.ifr_ifindex;
70
71			if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) {
72	pcg	1.2	logger(LOG_ERR, _("Could not bind %s to %s: %s"), device, iface, strerror(errno));
73	pcg	1.1	return false;
74			}
75
76			logger(LOG_INFO, _("%s is a %s"), device, device_info);
77
78			return true;
79			}
80
81			void close_device(void)
82			{
83			cp();
84
85			close(device_fd);
86			}
87
88			bool read_packet(vpn_packet_t *packet)
89			{
90			int lenin;
91
92			cp();
93
94			if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
95			logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
96			device, strerror(errno));
97			return false;
98			}
99
100			packet->len = lenin;
101
102			device_total_in += packet->len;
103
104			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
105			device_info);
106
107			return true;
108			}
109
110			bool write_packet(vpn_packet_t *packet)
111			{
112			cp();
113
114			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
115			packet->len, device_info);
116
117			if(write(device_fd, packet->data, packet->len) < 0) {
118			logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
119			strerror(errno));
120			return false;
121			}
122
123			device_total_out += packet->len;
124
125			return true;
126			}
127
128			void dump_device_stats(void)
129			{
130			cp();
131
132			logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
133			logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
134			logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
135			}