2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
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
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.
26 #include <sys/types.h>
28 #include <sys/timeb.h>
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <netinet/in_systm.h>
38 #include <netinet/ip.h>
39 #include <netinet/if_ether.h>
40 #include <netinet/ip_var.h>
41 #include <netinet/udp.h>
42 #include <netinet/udp_var.h>
43 #include <netinet/tcp.h>
44 #include <netinet/tcpip.h>
52 #ifdef HAVE_OS_PROTO_H
57 * The chunk size for NIT. This is the amount of buffering
58 * done for read calls.
60 #define CHUNKSIZE (2*1024)
63 * The total buffer space used by NIT.
65 #define BUFSPACE (4*CHUNKSIZE)
68 static int nit_setflags(int, int, int, char *);
71 * Private data for capturing on NIT devices.
74 struct pcap_stat stat;
78 pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
80 struct pcap_nit *pn = p->priv;
83 * "ps_recv" counts packets handed to the filter, not packets
84 * that passed the filter. As filtering is done in userland,
85 * this does not include packets dropped because we ran out
88 * "ps_drop" presumably counts packets dropped by the socket
89 * because of flow control requirements or resource exhaustion;
90 * it doesn't count packets dropped by the interface driver.
91 * As filtering is done in userland, it counts packets regardless
92 * of whether they would've passed the filter.
94 * These statistics don't include packets not yet read from the
95 * kernel by libpcap or packets not yet read from libpcap by the
103 pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
105 struct pcap_nit *pn = p->priv;
107 register u_char *bp, *cp, *ep;
108 register struct nit_hdr *nh;
113 cc = read(p->fd, (char *)p->buffer, p->bufsize);
115 if (errno == EWOULDBLOCK)
117 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
121 bp = (u_char *)p->buffer;
126 * Loop through each packet. The increment expression
127 * rounds up to the next int boundary past the end of
128 * the previous packet.
134 * Has "pcap_breakloop()" been called?
135 * If so, return immediately - if we haven't read any
136 * packets, clear the flag and return -2 to indicate
137 * that we were told to break out of the loop, otherwise
138 * leave the flag set, so that the *next* call will break
139 * out of the loop without having read any packets, and
140 * return the number of packets we've processed so far.
153 nh = (struct nit_hdr *)bp;
154 cp = bp + sizeof(*nh);
156 switch (nh->nh_state) {
164 pn->stat.ps_drop = nh->nh_dropped;
171 pcap_snprintf(p->errbuf, sizeof(p->errbuf),
172 "bad nit state %d", nh->nh_state);
176 bp += ((sizeof(struct nit_hdr) + nh->nh_datalen +
177 sizeof(int) - 1) & ~(sizeof(int) - 1));
179 caplen = nh->nh_wirelen;
180 if (caplen > p->snapshot)
181 caplen = p->snapshot;
182 if (bpf_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
183 struct pcap_pkthdr h;
184 h.ts = nh->nh_timestamp;
185 h.len = nh->nh_wirelen;
187 (*callback)(user, &h, cp);
188 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
200 pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
205 memset(&sa, 0, sizeof(sa));
206 strncpy(sa.sa_data, device, sizeof(sa.sa_data));
207 ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
209 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
217 nit_setflags(pcap_t *p)
221 memset(&nioc, 0, sizeof(nioc));
222 nioc.nioc_typetomatch = NT_ALLTYPES;
223 nioc.nioc_snaplen = p->snapshot;
224 nioc.nioc_bufalign = sizeof(int);
225 nioc.nioc_bufoffset = 0;
227 if (p->opt.buffer_size != 0)
228 nioc.nioc_bufspace = p->opt.buffer_size;
230 /* Default buffer size */
231 nioc.nioc_bufspace = BUFSPACE;
234 if (p->opt.immediate) {
236 * XXX - will this cause packets to be delivered immediately?
237 * XXX - given that this is for SunOS prior to 4.0, do
240 nioc.nioc_chunksize = 0;
242 nioc.nioc_chunksize = CHUNKSIZE;
243 if (p->opt.timeout != 0) {
244 nioc.nioc_flags |= NF_TIMEOUT;
245 nioc.nioc_timeout.tv_sec = p->opt.timeout / 1000;
246 nioc.nioc_timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
249 nioc.nioc_flags |= NF_PROMISC;
251 if (ioctl(p->fd, SIOCSNIT, &nioc) < 0) {
252 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
260 pcap_activate_nit(pcap_t *p)
263 struct sockaddr_nit snit;
267 * No monitor mode on SunOS 3.x or earlier (no
268 * Wi-Fi *devices* for the hardware that supported
271 return (PCAP_ERROR_RFMON_NOTSUP);
275 * Turn a negative snapshot value (invalid), a snapshot value of
276 * 0 (unspecified), or a value bigger than the normal maximum
277 * value, into the maximum allowed value.
279 * If some application really *needs* a bigger snapshot
280 * length, we should just increase MAXIMUM_SNAPLEN.
282 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
283 p->snapshot = MAXIMUM_SNAPLEN;
285 if (p->snapshot < 96)
287 * NIT requires a snapshot length of at least 96.
291 memset(p, 0, sizeof(*p));
292 p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
294 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
298 snit.snit_family = AF_NIT;
299 (void)strncpy(snit.snit_ifname, p->opt.device, NITIFSIZ);
301 if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
303 * XXX - there's probably a particular bind error that
304 * means "there's no such device" and a particular bind
305 * error that means "that device doesn't support NIT";
306 * they might be the same error, if they both end up
307 * meaning "NIT doesn't know about that device".
309 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
310 errno, "bind: %s", snit.snit_ifname);
313 if (nit_setflags(p) < 0)
317 * NIT supports only ethernets.
319 p->linktype = DLT_EN10MB;
321 p->bufsize = BUFSPACE;
322 p->buffer = malloc(p->bufsize);
323 if (p->buffer == NULL) {
324 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
330 * "p->fd" is a socket, so "select()" should work on it.
332 p->selectable_fd = p->fd;
335 * This is (presumably) a real Ethernet capture; give it a
336 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
337 * that an application can let you choose it, in case you're
338 * capturing DOCSIS traffic that a Cisco Cable Modem
339 * Termination System is putting out onto an Ethernet (it
340 * doesn't put an Ethernet header onto the wire, it puts raw
341 * DOCSIS frames out on the wire inside the low-level
344 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
346 * If that fails, just leave the list empty.
348 if (p->dlt_list != NULL) {
349 p->dlt_list[0] = DLT_EN10MB;
350 p->dlt_list[1] = DLT_DOCSIS;
354 p->read_op = pcap_read_nit;
355 p->inject_op = pcap_inject_nit;
356 p->setfilter_op = install_bpf_program; /* no kernel filtering */
357 p->setdirection_op = NULL; /* Not implemented. */
358 p->set_datalink_op = NULL; /* can't change data link type */
359 p->getnonblock_op = pcap_getnonblock_fd;
360 p->setnonblock_op = pcap_setnonblock_fd;
361 p->stats_op = pcap_stats_nit;
365 pcap_cleanup_live_common(p);
370 pcap_create_interface(const char *device _U_, char *ebuf)
374 p = pcap_create_common(ebuf, sizeof (struct pcap_nit));
378 p->activate_op = pcap_activate_nit;
383 * XXX - there's probably a particular bind error that means "that device
384 * doesn't support NIT"; if so, we should try a bind and use that.
387 can_be_bound(const char *name _U_)
393 get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
397 * XXX - is there a way to find out whether an adapter has
398 * something plugged into it?
404 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
406 return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
411 * Libpcap version string.
414 pcap_lib_version(void)
416 return (PCAP_VERSION_STRING);