1 | /* |
1 | /* |
2 | device-linux.C -- Interaction with Linux tun/tap device |
2 | device-linux.C -- Interaction with Linux tun/tap device |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
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41 | |
42 | |
42 | #include "gettext.h" |
43 | #include "gettext.h" |
43 | |
44 | |
44 | #include "conf.h" |
45 | #include "conf.h" |
45 | |
46 | |
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47 | #if TEST_ETHEREMU |
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48 | # define IF_istun |
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49 | # include "ether_emu.C" |
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50 | #endif |
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51 | |
46 | const char * |
52 | const char * |
47 | tap_device::info () |
53 | tap_device::info () |
48 | { |
54 | { |
49 | return _("Linux tun/tap device"); |
55 | return _("Linux tun/tap device"); |
50 | } |
56 | } |
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62 | slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); |
68 | slog (L_ERR, _("could not open device %s: %s"), device, strerror (errno)); |
63 | exit (1); |
69 | exit (1); |
64 | } |
70 | } |
65 | |
71 | |
66 | memset (&ifr, 0, sizeof (ifr)); |
72 | memset (&ifr, 0, sizeof (ifr)); |
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73 | #if TEST_ETHEREMU |
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74 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; |
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75 | #else |
67 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
76 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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77 | #endif |
68 | |
78 | |
69 | if (conf.ifname) |
79 | if (conf.ifname) |
70 | strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); |
80 | strncpy (ifr.ifr_name, conf.ifname, IFNAMSIZ); |
71 | else |
81 | else |
72 | ifr.ifr_name[0] = 0; |
82 | ifr.ifr_name[0] = 0; |
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96 | tap_packet * |
106 | tap_packet * |
97 | tap_device::recv () |
107 | tap_device::recv () |
98 | { |
108 | { |
99 | tap_packet *pkt = new tap_packet; |
109 | tap_packet *pkt = new tap_packet; |
100 | |
110 | |
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111 | #if TEST_ETHEREMU |
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112 | pkt->len = read (fd, &((*pkt)[14]), MAX_MTU - 14); |
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113 | #else |
101 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
114 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
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115 | #endif |
102 | |
116 | |
103 | if (pkt->len <= 0) |
117 | if (pkt->len <= 0) |
104 | { |
118 | { |
105 | delete pkt; |
119 | delete pkt; |
106 | slog (L_ERR, _("error while reading from %s %s: %s"), |
120 | slog (L_ERR, _("error while reading from %s %s: %s"), |
107 | info (), DEFAULT_DEVICE, strerror (errno)); |
121 | info (), DEFAULT_DEVICE, strerror (errno)); |
108 | return 0; |
122 | return 0; |
109 | } |
123 | } |
110 | |
124 | |
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125 | #if TEST_ETHEREMU |
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126 | pkt->len += 14; |
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127 | |
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128 | // assume ipv4 |
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129 | (*pkt)[12] = 0x08; |
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130 | (*pkt)[13] = 0x00; |
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131 | |
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132 | if (!ether_emu.tun_to_tap (pkt)) |
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133 | { |
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134 | delete pkt; |
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135 | return 0; |
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136 | } |
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137 | #endif |
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138 | |
111 | return pkt; |
139 | return pkt; |
112 | } |
140 | } |
113 | |
141 | |
114 | void |
142 | void |
115 | tap_device::send (tap_packet *pkt) |
143 | tap_device::send (tap_packet *pkt) |
116 | { |
144 | { |
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145 | #if TEST_ETHEREMU |
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146 | if (ether_emu.tap_to_tun (pkt) && |
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147 | write (fd, &((*pkt)[14]), pkt->len - 14) < 0) |
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148 | #else |
117 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
149 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
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150 | #endif |
118 | slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, |
151 | slog (L_ERR, _("can't write to %s %s: %s"), info (), DEFAULT_DEVICE, |
119 | strerror (errno)); |
152 | strerror (errno)); |
120 | } |
153 | } |
121 | |
154 | |