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1 office 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 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30  
31 #include <sys/types.h>
32 #include <sys/time.h>
33 #include <sys/bufmod.h>
34 #include <sys/stream.h>
35 #include <libdlpi.h>
36 #include <errno.h>
37 #include <memory.h>
38 #include <stropts.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42  
43 #include "pcap-int.h"
44 #include "dlpisubs.h"
45  
46 /* Forwards. */
47 static int dlpromiscon(pcap_t *, bpf_u_int32);
48 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *);
49 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t);
50 static void pcap_libdlpi_err(const char *, const char *, int, char *);
51 static void pcap_cleanup_libdlpi(pcap_t *);
52  
53 /*
54 * list_interfaces() will list all the network links that are
55 * available on a system.
56 */
57 static boolean_t list_interfaces(const char *, void *);
58  
59 typedef struct linknamelist {
60 char linkname[DLPI_LINKNAME_MAX];
61 struct linknamelist *lnl_next;
62 } linknamelist_t;
63  
64 typedef struct linkwalk {
65 linknamelist_t *lw_list;
66 int lw_err;
67 } linkwalk_t;
68  
69 /*
70 * The caller of this function should free the memory allocated
71 * for each linknamelist_t "entry" allocated.
72 */
73 static boolean_t
74 list_interfaces(const char *linkname, void *arg)
75 {
76 linkwalk_t *lwp = arg;
77 linknamelist_t *entry;
78  
79 if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) {
80 lwp->lw_err = ENOMEM;
81 return (B_TRUE);
82 }
83 (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX);
84  
85 if (lwp->lw_list == NULL) {
86 lwp->lw_list = entry;
87 } else {
88 entry->lnl_next = lwp->lw_list;
89 lwp->lw_list = entry;
90 }
91  
92 return (B_FALSE);
93 }
94  
95 static int
96 pcap_activate_libdlpi(pcap_t *p)
97 {
98 struct pcap_dlpi *pd = p->priv;
99 int status = 0;
100 int retv;
101 dlpi_handle_t dh;
102 dlpi_info_t dlinfo;
103  
104 /*
105 * Enable Solaris raw and passive DLPI extensions;
106 * dlpi_open() will not fail if the underlying link does not support
107 * passive mode. See dlpi(7P) for details.
108 */
109 retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE);
110 if (retv != DLPI_SUCCESS) {
111 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK)
112 status = PCAP_ERROR_NO_SUCH_DEVICE;
113 else if (retv == DL_SYSERR &&
114 (errno == EPERM || errno == EACCES))
115 status = PCAP_ERROR_PERM_DENIED;
116 else
117 status = PCAP_ERROR;
118 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv,
119 p->errbuf);
120 return (status);
121 }
122 pd->dlpi_hd = dh;
123  
124 if (p->opt.rfmon) {
125 /*
126 * This device exists, but we don't support monitor mode
127 * any platforms that support DLPI.
128 */
129 status = PCAP_ERROR_RFMON_NOTSUP;
130 goto bad;
131 }
132  
133 /* Bind with DLPI_ANY_SAP. */
134 if ((retv = dlpi_bind(pd->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) {
135 status = PCAP_ERROR;
136 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf);
137 goto bad;
138 }
139  
140 /* Enable promiscuous mode. */
141 if (p->opt.promisc) {
142 retv = dlpromiscon(p, DL_PROMISC_PHYS);
143 if (retv < 0) {
144 /*
145 * "You don't have permission to capture on
146 * this device" and "you don't have permission
147 * to capture in promiscuous mode on this
148 * device" are different; let the user know,
149 * so if they can't get permission to
150 * capture in promiscuous mode, they can at
151 * least try to capture in non-promiscuous
152 * mode.
153 *
154 * XXX - you might have to capture in
155 * promiscuous mode to see outgoing packets.
156 */
157 if (retv == PCAP_ERROR_PERM_DENIED)
158 status = PCAP_ERROR_PROMISC_PERM_DENIED;
159 else
160 status = retv;
161 goto bad;
162 }
163 } else {
164 /* Try to enable multicast. */
165 retv = dlpromiscon(p, DL_PROMISC_MULTI);
166 if (retv < 0) {
167 status = retv;
168 goto bad;
169 }
170 }
171  
172 /* Try to enable SAP promiscuity. */
173 retv = dlpromiscon(p, DL_PROMISC_SAP);
174 if (retv < 0) {
175 /*
176 * Not fatal, since the DL_PROMISC_PHYS mode worked.
177 * Report it as a warning, however.
178 */
179 if (p->opt.promisc)
180 status = PCAP_WARNING;
181 else {
182 status = retv;
183 goto bad;
184 }
185 }
186  
187 /* Determine link type. */
188 if ((retv = dlpi_info(pd->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) {
189 status = PCAP_ERROR;
190 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf);
191 goto bad;
192 }
193  
194 if (pcap_process_mactype(p, dlinfo.di_mactype) != 0) {
195 status = PCAP_ERROR;
196 goto bad;
197 }
198  
199 p->fd = dlpi_fd(pd->dlpi_hd);
200  
201 /* Push and configure bufmod. */
202 if (pcap_conf_bufmod(p, p->snapshot) != 0) {
203 status = PCAP_ERROR;
204 goto bad;
205 }
206  
207 /*
208 * Flush the read side.
209 */
210 if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) {
211 status = PCAP_ERROR;
212 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s",
213 pcap_strerror(errno));
214 goto bad;
215 }
216  
217 /* Allocate data buffer. */
218 if (pcap_alloc_databuf(p) != 0) {
219 status = PCAP_ERROR;
220 goto bad;
221 }
222  
223 /*
224 * "p->fd" is a FD for a STREAMS device, so "select()" and
225 * "poll()" should work on it.
226 */
227 p->selectable_fd = p->fd;
228  
229 p->read_op = pcap_read_libdlpi;
230 p->inject_op = pcap_inject_libdlpi;
231 p->setfilter_op = install_bpf_program; /* No kernel filtering */
232 p->setdirection_op = NULL; /* Not implemented */
233 p->set_datalink_op = NULL; /* Can't change data link type */
234 p->getnonblock_op = pcap_getnonblock_fd;
235 p->setnonblock_op = pcap_setnonblock_fd;
236 p->stats_op = pcap_stats_dlpi;
237 p->cleanup_op = pcap_cleanup_libdlpi;
238  
239 return (status);
240 bad:
241 pcap_cleanup_libdlpi(p);
242 return (status);
243 }
244  
245 #define STRINGIFY(n) #n
246  
247 static int
248 dlpromiscon(pcap_t *p, bpf_u_int32 level)
249 {
250 struct pcap_dlpi *pd = p->priv;
251 int retv;
252 int err;
253  
254 retv = dlpi_promiscon(pd->dlpi_hd, level);
255 if (retv != DLPI_SUCCESS) {
256 if (retv == DL_SYSERR &&
257 (errno == EPERM || errno == EACCES))
258 err = PCAP_ERROR_PERM_DENIED;
259 else
260 err = PCAP_ERROR;
261 pcap_libdlpi_err(p->opt.source, "dlpi_promiscon" STRINGIFY(level),
262 retv, p->errbuf);
263 return (err);
264 }
265 return (0);
266 }
267  
268 /*
269 * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find
270 * network links that are plumbed and are up. dlpi_walk(3DLPI) will find
271 * additional network links present in the system.
272 */
273 int
274 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
275 {
276 int retv = 0;
277  
278 linknamelist_t *entry, *next;
279 linkwalk_t lw = {NULL, 0};
280 int save_errno;
281  
282 /* dlpi_walk() for loopback will be added here. */
283  
284 dlpi_walk(list_interfaces, &lw, 0);
285  
286 if (lw.lw_err != 0) {
287 snprintf(errbuf, PCAP_ERRBUF_SIZE,
288 "dlpi_walk: %s", pcap_strerror(lw.lw_err));
289 retv = -1;
290 goto done;
291 }
292  
293 /* Add linkname if it does not exist on the list. */
294 for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) {
295 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0)
296 retv = -1;
297 }
298 done:
299 save_errno = errno;
300 for (entry = lw.lw_list; entry != NULL; entry = next) {
301 next = entry->lnl_next;
302 free(entry);
303 }
304 errno = save_errno;
305  
306 return (retv);
307 }
308  
309 /*
310 * Read data received on DLPI handle. Returns -2 if told to terminate, else
311 * returns the number of packets read.
312 */
313 static int
314 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user)
315 {
316 struct pcap_dlpi *pd = p->priv;
317 int len;
318 u_char *bufp;
319 size_t msglen;
320 int retv;
321  
322 len = p->cc;
323 if (len != 0) {
324 bufp = p->bp;
325 goto process_pkts;
326 }
327 do {
328 /* Has "pcap_breakloop()" been called? */
329 if (p->break_loop) {
330 /*
331 * Yes - clear the flag that indicates that it has,
332 * and return -2 to indicate that we were told to
333 * break out of the loop.
334 */
335 p->break_loop = 0;
336 return (-2);
337 }
338  
339 msglen = p->bufsize;
340 bufp = p->buffer + p->offset;
341  
342 retv = dlpi_recv(pd->dlpi_hd, NULL, NULL, bufp,
343 &msglen, -1, NULL);
344 if (retv != DLPI_SUCCESS) {
345 /*
346 * This is most likely a call to terminate out of the
347 * loop. So, do not return an error message, instead
348 * check if "pcap_breakloop()" has been called above.
349 */
350 if (retv == DL_SYSERR && errno == EINTR) {
351 len = 0;
352 continue;
353 }
354 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd),
355 "dlpi_recv", retv, p->errbuf);
356 return (-1);
357 }
358 len = msglen;
359 } while (len == 0);
360  
361 process_pkts:
362 return (pcap_process_pkts(p, callback, user, count, bufp, len));
363 }
364  
365 static int
366 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size)
367 {
368 struct pcap_dlpi *pd = p->priv;
369 int retv;
370  
371 retv = dlpi_send(pd->dlpi_hd, NULL, 0, buf, size, NULL);
372 if (retv != DLPI_SUCCESS) {
373 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), "dlpi_send", retv,
374 p->errbuf);
375 return (-1);
376 }
377 /*
378 * dlpi_send(3DLPI) does not provide a way to return the number of
379 * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was
380 * returned we are assuming 'size' bytes were sent.
381 */
382 return (size);
383 }
384  
385 /*
386 * Close dlpi handle.
387 */
388 static void
389 pcap_cleanup_libdlpi(pcap_t *p)
390 {
391 struct pcap_dlpi *pd = p->priv;
392  
393 if (pd->dlpi_hd != NULL) {
394 dlpi_close(pd->dlpi_hd);
395 pd->dlpi_hd = NULL;
396 p->fd = -1;
397 }
398 pcap_cleanup_live_common(p);
399 }
400  
401 /*
402 * Write error message to buffer.
403 */
404 static void
405 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf)
406 {
407 snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s",
408 func, linkname, dlpi_strerror(err));
409 }
410  
411 pcap_t *
412 pcap_create_interface(const char *device, char *ebuf)
413 {
414 pcap_t *p;
415  
416 p = pcap_create_common(device, ebuf, sizeof (struct pcap_dlpi));
417 if (p == NULL)
418 return (NULL);
419  
420 p->activate_op = pcap_activate_libdlpi;
421 return (p);
422 }