1 /*
2 device.c -- VDE plug
3 Copyright (C) 2013 Guus Sliepen <guus@tinc-vpn.org>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #include "system.h"
21
22 #include <libvdeplug_dyn.h>
23
24 #include "conf.h"
25 #include "device.h"
26 #include "names.h"
27 #include "net.h"
28 #include "logger.h"
29 #include "utils.h"
30 #include "route.h"
31 #include "xalloc.h"
32
33 static struct vdepluglib plug;
34 static struct vdeconn *conn = NULL;
35 static int port = 0;
36 static char *group = NULL;
37 static const char *device_info = "VDE socket";
38
setup_device(void)39 static bool setup_device(void) {
40 libvdeplug_dynopen(plug);
41
42 if(!plug.dl_handle) {
43 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open libvdeplug library!");
44 return false;
45 }
46
47 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
48 xasprintf(&device, RUNSTATEDIR "/vde.ctl");
49 }
50
51 get_config_string(lookup_config(config_tree, "Interface"), &iface);
52
53 get_config_int(lookup_config(config_tree, "VDEPort"), &port);
54
55 get_config_string(lookup_config(config_tree, "VDEGroup"), &group);
56
57 struct vde_open_args args = {
58 .port = port,
59 .group = group,
60 .mode = 0700,
61 };
62
63 conn = plug.vde_open(device, identname, &args);
64
65 if(!conn) {
66 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open VDE socket %s", device);
67 return false;
68 }
69
70 device_fd = plug.vde_datafd(conn);
71
72 #ifdef FD_CLOEXEC
73 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
74 #endif
75
76 logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
77
78 if(routing_mode == RMODE_ROUTER) {
79 overwrite_mac = true;
80 }
81
82 return true;
83 }
84
close_device(void)85 static void close_device(void) {
86 if(conn) {
87 plug.vde_close(conn);
88 conn = NULL;
89 }
90
91 if(plug.dl_handle) {
92 libvdeplug_dynclose(plug);
93 }
94
95 free(device);
96 device = NULL;
97
98 free(iface);
99 iface = NULL;
100
101 device_info = NULL;
102 }
103
read_packet(vpn_packet_t * packet)104 static bool read_packet(vpn_packet_t *packet) {
105 int lenin = (ssize_t)plug.vde_recv(conn, DATA(packet), MTU, 0);
106
107 if(lenin <= 0) {
108 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
109 event_exit();
110 return false;
111 }
112
113 packet->len = lenin;
114
115 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
116
117 return true;
118 }
119
write_packet(vpn_packet_t * packet)120 static bool write_packet(vpn_packet_t *packet) {
121 if((ssize_t)plug.vde_send(conn, DATA(packet), packet->len, 0) < 0) {
122 if(errno != EINTR && errno != EAGAIN) {
123 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
124 event_exit();
125 }
126
127 return false;
128 }
129
130 return true;
131 }
132
133 const devops_t vde_devops = {
134 .setup = setup_device,
135 .close = close_device,
136 .read = read_packet,
137 .write = write_packet,
138 };
139