1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
|
/* source: xio-interface.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for opening addresses of raw socket type */
#include "xiosysincludes.h"
#if _WITH_INTERFACE
#include "xioopen.h"
#include "xio-socket.h"
#include "xio-ascii.h"
#include "xio-interface.h"
static int xioopen_interface(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *xfd, const struct addrdesc *addrdesc);
/*0 const struct optdesc opt_interface_addr = { "interface-addr", "address", OPT_INTERFACE_ADDR, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };*/
/*0 const struct optdesc opt_interface_netmask = { "interface-netmask", "netmask", OPT_INTERFACE_NETMASK, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };*/
const struct optdesc opt_iff_up = { "iff-up", "up", OPT_IFF_UP, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_UP };
const struct optdesc opt_iff_broadcast = { "iff-broadcast", NULL, OPT_IFF_BROADCAST, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_BROADCAST };
const struct optdesc opt_iff_debug = { "iff-debug" , NULL, OPT_IFF_DEBUG, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_DEBUG };
const struct optdesc opt_iff_loopback = { "iff-loopback" , "loopback", OPT_IFF_LOOPBACK, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_LOOPBACK };
const struct optdesc opt_iff_pointopoint = { "iff-pointopoint", "pointopoint",OPT_IFF_POINTOPOINT, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_POINTOPOINT };
const struct optdesc opt_iff_notrailers = { "iff-notrailers", "notrailers", OPT_IFF_NOTRAILERS, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_NOTRAILERS };
const struct optdesc opt_iff_running = { "iff-running", "running", OPT_IFF_RUNNING, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_RUNNING };
const struct optdesc opt_iff_noarp = { "iff-noarp", "noarp", OPT_IFF_NOARP, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_NOARP };
const struct optdesc opt_iff_promisc = { "iff-promisc", "promisc", OPT_IFF_PROMISC, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_PROMISC };
const struct optdesc opt_iff_allmulti = { "iff-allmulti", "allmulti", OPT_IFF_ALLMULTI, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_ALLMULTI };
#ifdef IFF_MASTER
const struct optdesc opt_iff_master = { "iff-master", "master", OPT_IFF_MASTER, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_MASTER };
#endif
#ifdef IFF_SLAVE
const struct optdesc opt_iff_slave = { "iff-slave", "slave", OPT_IFF_SLAVE, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_SLAVE };
#endif
const struct optdesc opt_iff_multicast = { "iff-multicast", NULL, OPT_IFF_MULTICAST, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_MULTICAST };
#ifdef IFF_PORTSEL
const struct optdesc opt_iff_portsel = { "iff-portsel", "portsel", OPT_IFF_PORTSEL, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_PORTSEL };
#endif
#ifdef IFF_AUTOMEDIA
const struct optdesc opt_iff_automedia = { "iff-automedia", "automedia", OPT_IFF_AUTOMEDIA, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_AUTOMEDIA };
#endif
/*const struct optdesc opt_iff_dynamic = { "iff-dynamic", "dynamic", OPT_IFF_DYNAMIC, GROUP_INTERFACE, PH_OFFSET, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(short), IFF_DYNAMIC };*/
#ifdef PACKET_AUXDATA
const struct optdesc opt_retrieve_vlan = { "retrieve-vlan", NULL, OPT_RETRIEVE_VLAN, GROUP_INTERFACE, PH_LATE, TYPE_CONST, OFUNC_SPEC };
#endif
#if LATER
const struct optdesc opt_route = { "route", NULL, OPT_ROUTE, GROUP_INTERFACE, PH_INIT, TYPE_STRING, OFUNC_SPEC };
#endif
#if WITH_INTERFACE
const struct addrdesc xioaddr_interface = { "INTERFACE", 3, xioopen_interface, GROUP_FD|GROUP_SOCKET|GROUP_INTERFACE, PF_PACKET, 0, 0 HELP(":<interface>") };
#endif /* WITH_INTERFACE */
static
int _xioopen_interface(const char *ifname,
struct opt *opts, int xioflags, xiofile_t *xxfd,
groups_t groups, int pf) {
xiosingle_t *sfd = &xxfd->stream;
union sockaddr_union us = {{0}};
socklen_t uslen;
int socktype = SOCK_RAW;
unsigned int ifidx;
bool needbind = false;
char *bindstring = NULL;
struct sockaddr_ll sall = { 0 };
int rc;
if (ifindex(ifname, &ifidx, -1) < 0) {
Error1("unknown interface \"%s\"", ifname);
ifidx = 0; /* desperate attempt to continue */
}
if (sfd->howtoend == END_UNSPEC)
sfd->howtoend = END_INTERFACE;
retropt_int(opts, OPT_SO_TYPE, &socktype);
retropt_socket_pf(opts, &pf);
/* ...res_opts[] */
if (applyopts_single(sfd, opts, PH_INIT) < 0) return -1;
applyopts(sfd, -1, opts, PH_INIT);
sfd->salen = sizeof(sfd->peersa);
if (pf == PF_UNSPEC) {
pf = sfd->peersa.soa.sa_family;
}
sfd->dtype = XIODATA_RECVFROM_SKIPIP;
if (retropt_string(opts, OPT_BIND, &bindstring)) {
needbind = true;
}
/*!!! parse by ':' */
us.ll.sll_family = pf;
us.ll.sll_protocol = htons(ETH_P_ALL);
us.ll.sll_ifindex = ifidx;
uslen = sizeof(sall);
needbind = true;
sfd->peersa = (union sockaddr_union)us;
rc =
_xioopen_dgram_sendto(needbind?&us:NULL, uslen,
opts, xioflags, sfd, groups, pf, socktype, 0, 0);
if (rc < 0)
return rc;
strncpy(sfd->para.interface.name, ifname, IFNAMSIZ);
_xiointerface_get_iff(sfd->fd, ifname, &sfd->para.interface.save_iff);
_xiointerface_apply_iff(sfd->fd, ifname, sfd->para.interface.iff_opts);
if (_interface_retrieve_vlan(sfd, opts) < 0)
return STAT_NORETRY;
#ifdef PACKET_IGNORE_OUTGOING
/* Raw socket might also provide packets that are outbound - we are not
interested in these and disable this "feature" in kernel if possible */
if (Setsockopt(sfd->fd, SOL_PACKET, PACKET_IGNORE_OUTGOING, &one, sizeof(one)) < 0) {
Warn2("setsockopt(%d, SOL_PACKET, PACKET_IGNORE_OUTGOING, {1}): %s",
sfd->fd, strerror(errno));
}
#endif /*defined(PACKET_IGNORE_OUTGOING) */
return 0;
}
int _interface_retrieve_vlan(struct single *sfd, struct opt *opts) {
#if HAVE_STRUCT_TPACKET_AUXDATA
if (retropt_bool(opts, OPT_RETRIEVE_VLAN,
&sfd->para.socket.retrieve_vlan)
== 0) {
if (!xioparms.experimental) {
Warn1("option %s is experimental", opts->desc->defname);
}
}
if (sfd->para.socket.retrieve_vlan) {
if (_interface_setsockopt_auxdata(sfd->fd, 1) < 0) {
return -1;
}
}
#endif /* HAVE_STRUCT_TPACKET_AUXDATA */
return 0;
}
int _interface_setsockopt_auxdata(int fd, int auxdata) {
#ifdef PACKET_AUXDATA
/* Linux strips VLAN tag off incoming packets and makes it available per
ancillary data as auxdata. Apply option packet-auxdata if you want the
VLAN tag to be restored by Socat in the received packet */
if (auxdata) {
int rc;
Info1("setsockopt(fd=%d, level=SOL_PACKET, optname=PACKET_AUXDATA)", fd);
rc = Setsockopt(fd, SOL_PACKET, PACKET_AUXDATA, &auxdata, sizeof(auxdata));
if (rc < 0) {
Error3("setsockopt(%d, SOL_PACKET, PACKET_AUXDATA, , {%d}): %s",
fd, auxdata, strerror(errno));
}
}
#endif /* defined(PACKET_AUXDATA) */
return 0;
}
static
int xioopen_interface(
int argc,
const char *argv[],
struct opt *opts,
int xioflags,
xiofile_t *xxfd,
const struct addrdesc *addrdesc)
{
xiosingle_t *sfd = &xxfd->stream;
int result;
if (argc != 2) {
xio_syntax(argv[0], 1, argc-1, addrdesc->syntax);
return STAT_NORETRY;
}
if ((result =
_xioopen_interface(argv[1], opts, xioflags, xxfd, addrdesc->groups,
addrdesc->arg1))
!= STAT_OK) {
return result;
}
sfd->dtype = XIOREAD_RECV|XIOWRITE_SENDTO;
if (addrdesc->arg1 == PF_INET) {
sfd->dtype |= XIOREAD_RECV_SKIPIP;
}
sfd->para.socket.la.soa.sa_family = sfd->peersa.soa.sa_family;
_xio_openlate(sfd, opts);
return STAT_OK;
}
/* Retrieves the interface flags related to sockfd */
int _xiointerface_get_iff(
int sockfd,
const char *name,
short *save_iff)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
sockfd, ifr.ifr_name, strerror(errno));
}
*save_iff = ifr.ifr_flags;
return 0;
}
/* Applies the interface flags to the socket FD.
Used by INTERFACE and TUN
*/
int _xiointerface_set_iff(
int sockfd,
const char *name,
short new_iff)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
sockfd, ifr.ifr_name, strerror(errno));
}
ifr.ifr_flags = new_iff;
if (Ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
Error4("ioctl(%d, SIOCSIFFLAGS, {\"%s\", %hd}: %s",
sockfd, ifr.ifr_name, ifr.ifr_flags, strerror(errno));
}
return 0;
}
/* Applies the interface flags to the socket FD
Used by INTERFACE and TUN
*/
int _xiointerface_apply_iff(
int sockfd,
const char *name,
short iff_opts[2])
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
sockfd, ifr.ifr_name, strerror(errno));
}
Debug2("\"%s\": system set flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
ifr.ifr_flags |= iff_opts[0];
ifr.ifr_flags &= ~iff_opts[1];
Debug2("\"%s\": xio merged flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
if (Ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
Error4("ioctl(%d, SIOCSIFFLAGS, {\"%s\", %hd}: %s",
sockfd, ifr.ifr_name, ifr.ifr_flags, strerror(errno));
}
ifr.ifr_flags = 0;
if (Ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
Error3("ioctl(%d, SIOCGIFFLAGS, {\"%s\"}: %s",
sockfd, ifr.ifr_name, strerror(errno));
}
Debug2("\"%s\": resulting flags: 0x%hx", ifr.ifr_name, ifr.ifr_flags);
return 0;
}
#if HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA
/* Converts the ancillary message in *cmsg into a form usable for further
processing. Knows the specifics of common message types.
On PACKET_AUXDATA it stored the ancillary data in the XFD.
For other types:
returns the number of resulting syntax elements in *num,
returns a sequence of \0 terminated type strings in *typbuff,
returns a sequence of \0 terminated name strings in *nambuff,
returns a sequence of \0 terminated value strings in *valbuff,
the respective len parameters specify the available space in the buffers
returns STAT_OK or other STAT_*
*/
int
xiolog_ancillary_packet(struct single *sfd,
struct cmsghdr *cmsg, int *num,
char *typbuff, int typlen,
char *nambuff, int namlen,
char *envbuff, int envlen,
char *valbuff, int vallen) {
#if LATER
const char *cmsgtype, *cmsgname, *cmsgenvn;
size_t msglen;
#endif
struct tpacket_auxdata *auxp;
int rc = STAT_OK;
*num = 0;
#if defined(CMSG_DATA)
#if LATER
msglen = cmsg->cmsg_len-((char *)CMSG_DATA(cmsg)-(char *)cmsg);
#endif
switch (cmsg->cmsg_type) {
#if HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID
case PACKET_AUXDATA:
#if LATER
cmsgname = "packet_auxdata";
cmsgtype = "auxdata";
cmsgenvn = "AUXDATA";
#endif
auxp = (struct tpacket_auxdata *)CMSG_DATA(cmsg);
Info8("%s(): Ancillary message: PACKET_AUXDATA: status="F_uint32_t", len="F_uint32_t", snaplen="F_uint32_t", mac="F_uint16_t", net="F_uint16_t", vlan_tci="F_uint16_t", vlan_tpid="F_uint16_t"", __func__, auxp->tp_status, auxp->tp_len, auxp->tp_snaplen, auxp->tp_mac, auxp->tp_net, auxp->tp_vlan_tci, auxp->tp_vlan_tpid);
sfd->para.socket.ancill_data_packet_auxdata = *auxp;
sfd->para.socket.ancill_flag.packet_auxdata = 1;
snprintf(typbuff, typlen, "PACKET.%u", cmsg->cmsg_type);
nambuff[0] = '\0'; strncat(nambuff, "vlan", namlen-1);
snprintf(strchr(valbuff, '\0')-1/*def \n*/, vallen-strlen(valbuff)+1, ", %d", auxp->tp_vlan_tci);
break;
#endif /* HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID */
default: /* binary data */
Warn1("xiolog_ancillary_packet(): INTERNAL: cmsg_type=%d not handled", cmsg->cmsg_type);
return rc;
}
return rc;
#else /* !defined(CMSG_DATA) */
return STAT_NORETRY;
#endif /* !defined(CMSG_DATA) */
}
#endif /* HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA */
#endif /* _WITH_INTERFACE */
|
