1 /*
2 * Copyright (c) 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * This code contributed by Sagun Shakya (sagun.shakya@sun.com)
22 */
23 /*
24 * Packet capture routines for DLPI using libdlpi under SunOS 5.11.
25 */
26
27 #ifndef lint
28 static const char rcsid[] _U_ =
29 "@(#) $Header: /tcpdump/master/libpcap/pcap-libdlpi.c,v 1.6 2008-04-14 20:40:58 guy Exp $ (LBL)";
30 #endif
31
32 #ifdef HAVE_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #include <sys/types.h>
37 #include <sys/time.h>
38 #include <sys/bufmod.h>
39 #include <sys/stream.h>
40 #include <libdlpi.h>
41 #include <errno.h>
42 #include <memory.h>
43 #include <stropts.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47
48 #include "pcap-int.h"
49 #include "dlpisubs.h"
50
51 /* Forwards. */
52 static int dlpromiscon(pcap_t *, bpf_u_int32);
53 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
54 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
55 static void pcap_libdlpi_err(const char *, const char *, int, char *);
56 static void pcap_cleanup_libdlpi(pcap_t *);
57
58 /*
59 * list_interfaces() will list all the network links that are
60 * available on a system.
61 */
62 static boolean_t list_interfaces(const char *, void *);
63
64 typedef struct linknamelist {
65 char linkname[DLPI_LINKNAME_MAX];
66 struct linknamelist *lnl_next;
67 } linknamelist_t;
68
69 typedef struct linkwalk {
70 linknamelist_t *lw_list;
71 int lw_err;
72 } linkwalk_t;
73
74 /*
75 * The caller of this function should free the memory allocated
76 * for each linknamelist_t "entry" allocated.
77 */
78 static boolean_t
list_interfaces(const char * linkname,void * arg)79 list_interfaces(const char *linkname, void *arg)
80 {
81 linkwalk_t *lwp = arg;
82 linknamelist_t *entry;
83
84 if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
85 lwp->lw_err = ENOMEM;
86 return (B_TRUE);
87 }
88 (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
89
90 if (lwp->lw_list == NULL) {
91 lwp->lw_list = entry;
92 } else {
93 entry->lnl_next = lwp->lw_list;
94 lwp->lw_list = entry;
95 }
96
97 return (B_FALSE);
98 }
99
100 static int
pcap_activate_libdlpi(pcap_t * p)101 pcap_activate_libdlpi(pcap_t *p)
102 {
103 struct pcap_dlpi *pd = p->priv;
104 int retv;
105 dlpi_handle_t dh;
106 dlpi_info_t dlinfo;
107 int err = PCAP_ERROR;
108
109 /*
110 * Enable Solaris raw and passive DLPI extensions;
111 * dlpi_open() will not fail if the underlying link does not support
112 * passive mode. See dlpi(7P) for details.
113 */
114 retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
115 if (retv != DLPI_SUCCESS) {
116 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
117 err = PCAP_ERROR_NO_SUCH_DEVICE;
118 else if (retv == DL_SYSERR &&
119 (errno == EPERM || errno == EACCES))
120 err = PCAP_ERROR_PERM_DENIED;
121 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
122 p->errbuf);
123 return (err);
124 }
125 pd->dlpi_hd = dh;
126
127 if (p->opt.rfmon) {
128 /*
129 * This device exists, but we don't support monitor mode
130 * any platforms that support DLPI.
131 */
132 err = PCAP_ERROR_RFMON_NOTSUP;
133 goto bad;
134 }
135
136 /* Bind with DLPI_ANY_SAP. */
137 if ((retv = dlpi_bind(pd->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
138 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
139 goto bad;
140 }
141
142 /* Enable promiscuous mode. */
143 if (p->opt.promisc) {
144 err = dlpromiscon(p, DL_PROMISC_PHYS);
145 if (err < 0) {
146 /*
147 * "You don't have permission to capture on
148 * this device" and "you don't have permission
149 * to capture in promiscuous mode on this
150 * device" are different; let the user know,
151 * so if they can't get permission to
152 * capture in promiscuous mode, they can at
153 * least try to capture in non-promiscuous
154 * mode.
155 *
156 * XXX - you might have to capture in
157 * promiscuous mode to see outgoing packets.
158 */
159 if (err == PCAP_ERROR_PERM_DENIED)
160 err = PCAP_ERROR_PROMISC_PERM_DENIED;
161 goto bad;
162 }
163 } else {
164 /* Try to enable multicast. */
165 err = dlpromiscon(p, DL_PROMISC_MULTI);
166 if (err < 0)
167 goto bad;
168 }
169
170 /* Try to enable SAP promiscuity. */
171 err = dlpromiscon(p, DL_PROMISC_SAP);
172 if (err < 0) {
173 /*
174 * Not fatal, since the DL_PROMISC_PHYS mode worked.
175 * Report it as a warning, however.
176 */
177 if (p->opt.promisc)
178 err = PCAP_WARNING;
179 else
180 goto bad;
181 }
182
183 /* Determine link type. */
184 if ((retv = dlpi_info(pd->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
185 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
186 goto bad;
187 }
188
189 if (pcap_process_mactype(p, dlinfo.di_mactype) != 0)
190 goto bad;
191
192 p->fd = dlpi_fd(pd->dlpi_hd);
193
194 /* Push and configure bufmod. */
195 if (pcap_conf_bufmod(p, p->snapshot) != 0)
196 goto bad;
197
198 /*
199 * Flush the read side.
200 */
201 if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
202 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
203 pcap_strerror(errno));
204 goto bad;
205 }
206
207 /* Allocate data buffer. */
208 if (pcap_alloc_databuf(p) != 0)
209 goto bad;
210
211 /*
212 * "p->fd" is a FD for a STREAMS device, so "select()" and
213 * "poll()" should work on it.
214 */
215 p->selectable_fd = p->fd;
216
217 p->read_op = pcap_read_libdlpi;
218 p->inject_op = pcap_inject_libdlpi;
219 p->setfilter_op = install_bpf_program; /* No kernel filtering */
220 p->setdirection_op = NULL; /* Not implemented */
221 p->set_datalink_op = NULL; /* Can't change data link type */
222 p->getnonblock_op = pcap_getnonblock_fd;
223 p->setnonblock_op = pcap_setnonblock_fd;
224 p->stats_op = pcap_stats_dlpi;
225 p->cleanup_op = pcap_cleanup_libdlpi;
226
227 return (0);
228 bad:
229 pcap_cleanup_libdlpi(p);
230 return (err);
231 }
232
233 #define STRINGIFY(n) #n
234
235 static int
dlpromiscon(pcap_t * p,bpf_u_int32 level)236 dlpromiscon(pcap_t *p, bpf_u_int32 level)
237 {
238 struct pcap_dlpi *pd = p->priv;
239 int retv;
240 int err;
241
242 retv = dlpi_promiscon(pd->dlpi_hd, level);
243 if (retv != DLPI_SUCCESS) {
244 if (retv == DL_SYSERR &&
245 (errno == EPERM || errno == EACCES))
246 err = PCAP_ERROR_PERM_DENIED;
247 else
248 err = PCAP_ERROR;
249 pcap_libdlpi_err(p->opt.source, "dlpi_promiscon" STRINGIFY(level),
250 retv, p->errbuf);
251 return (err);
252 }
253 return (0);
254 }
255
256 /*
257 * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
258 * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
259 * additional network links present in the system.
260 */
261 int
pcap_platform_finddevs(pcap_if_t ** alldevsp,char * errbuf)262 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
263 {
264 int retv = 0;
265
266 linknamelist_t *entry, *next;
267 linkwalk_t lw = {NULL, 0};
268 int save_errno;
269
270 /* dlpi_walk() for loopback will be added here. */
271
272 dlpi_walk(list_interfaces, &lw, 0);
273
274 if (lw.lw_err != 0) {
275 snprintf(errbuf, PCAP_ERRBUF_SIZE,
276 "dlpi_walk: %s", pcap_strerror(lw.lw_err));
277 retv = -1;
278 goto done;
279 }
280
281 /* Add linkname if it does not exist on the list. */
282 for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
283 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
284 retv = -1;
285 }
286 done:
287 save_errno = errno;
288 for (entry = lw.lw_list; entry != NULL; entry = next) {
289 next = entry->lnl_next;
290 free(entry);
291 }
292 errno = save_errno;
293
294 return (retv);
295 }
296
297 /*
298 * Read data received on DLPI handle. Returns -2 if told to terminate, else
299 * returns the number of packets read.
300 */
301 static int
pcap_read_libdlpi(pcap_t * p,int count,pcap_handler callback,u_char * user)302 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
303 {
304 struct pcap_dlpi *pd = p->priv;
305 int len;
306 u_char *bufp;
307 size_t msglen;
308 int retv;
309
310 len = p->cc;
311 if (len != 0) {
312 bufp = p->bp;
313 goto process_pkts;
314 }
315 do {
316 /* Has "pcap_breakloop()" been called? */
317 if (p->break_loop) {
318 /*
319 * Yes - clear the flag that indicates that it has,
320 * and return -2 to indicate that we were told to
321 * break out of the loop.
322 */
323 p->break_loop = 0;
324 return (-2);
325 }
326
327 msglen = p->bufsize;
328 bufp = p->buffer + p->offset;
329
330 retv = dlpi_recv(pd->dlpi_hd, NULL, NULL, bufp,
331 &msglen, -1, NULL);
332 if (retv != DLPI_SUCCESS) {
333 /*
334 * This is most likely a call to terminate out of the
335 * loop. So, do not return an error message, instead
336 * check if "pcap_breakloop()" has been called above.
337 */
338 if (retv == DL_SYSERR && errno == EINTR) {
339 len = 0;
340 continue;
341 }
342 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd),
343 "dlpi_recv", retv, p->errbuf);
344 return (-1);
345 }
346 len = msglen;
347 } while (len == 0);
348
349 process_pkts:
350 return (pcap_process_pkts(p, callback, user, count, bufp, len));
351 }
352
353 static int
pcap_inject_libdlpi(pcap_t * p,const void * buf,size_t size)354 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
355 {
356 struct pcap_dlpi *pd = p->priv;
357 int retv;
358
359 retv = dlpi_send(pd->dlpi_hd, NULL, 0, buf, size, NULL);
360 if (retv != DLPI_SUCCESS) {
361 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), "dlpi_send", retv,
362 p->errbuf);
363 return (-1);
364 }
365 /*
366 * dlpi_send(3DLPI) does not provide a way to return the number of
367 * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
368 * returned we are assuming 'size' bytes were sent.
369 */
370 return (size);
371 }
372
373 /*
374 * Close dlpi handle.
375 */
376 static void
pcap_cleanup_libdlpi(pcap_t * p)377 pcap_cleanup_libdlpi(pcap_t *p)
378 {
379 struct pcap_dlpi *pd = p->priv;
380
381 if (pd->dlpi_hd != NULL) {
382 dlpi_close(pd->dlpi_hd);
383 pd->dlpi_hd = NULL;
384 p->fd = -1;
385 }
386 pcap_cleanup_live_common(p);
387 }
388
389 /*
390 * Write error message to buffer.
391 */
392 static void
pcap_libdlpi_err(const char * linkname,const char * func,int err,char * errbuf)393 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
394 {
395 snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
396 func, linkname, dlpi_strerror(err));
397 }
398
399 pcap_t *
pcap_create_interface(const char * device,char * ebuf)400 pcap_create_interface(const char *device, char *ebuf)
401 {
402 pcap_t *p;
403
404 p = pcap_create_common(device, ebuf, sizeof (struct pcap_dlpi));
405 if (p == NULL)
406 return (NULL);
407
408 p->activate_op = pcap_activate_libdlpi;
409 return (p);
410 }
411