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7 * retain the above copyright notice and this paragraph in its entirety, (2)
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12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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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>
51 #ifdef HAVE_OS_PROTO_H
56 * The chunk size for NIT. This is the amount of buffering
57 * done for read calls.
59 #define CHUNKSIZE (2*1024)
62 * The total buffer space used by NIT.
64 #define BUFSPACE (4*CHUNKSIZE)
67 static int nit_setflags(int, int, int, char *);
70 * Private data for capturing on NIT devices.
73 struct pcap_stat stat;
77 pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
79 struct pcap_nit *pn = p->priv;
82 * "ps_recv" counts packets handed to the filter, not packets
83 * that passed the filter. As filtering is done in userland,
84 * this does not include packets dropped because we ran out
87 * "ps_drop" presumably counts packets dropped by the socket
88 * because of flow control requirements or resource exhaustion;
89 * it doesn't count packets dropped by the interface driver.
90 * As filtering is done in userland, it counts packets regardless
91 * of whether they would've passed the filter.
93 * These statistics don't include packets not yet read from the
94 * kernel by libpcap or packets not yet read from libpcap by the
102 pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
104 struct pcap_nit *pn = p->priv;
106 register u_char *bp, *cp, *ep;
107 register struct nit_hdr *nh;
112 cc = read(p->fd, (char *)p->buffer, p->bufsize);
114 if (errno == EWOULDBLOCK)
116 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
120 bp = (u_char *)p->buffer;
125 * Loop through each packet. The increment expression
126 * rounds up to the next int boundary past the end of
127 * the previous packet.
129 * This assumes that a single buffer of packets will have
130 * <= INT_MAX packets, so the packet count doesn't overflow.
136 * Has "pcap_breakloop()" been called?
137 * If so, return immediately - if we haven't read any
138 * packets, clear the flag and return -2 to indicate
139 * that we were told to break out of the loop, otherwise
140 * leave the flag set, so that the *next* call will break
141 * out of the loop without having read any packets, and
142 * return the number of packets we've processed so far.
155 nh = (struct nit_hdr *)bp;
156 cp = bp + sizeof(*nh);
158 switch (nh->nh_state) {
166 pn->stat.ps_drop = nh->nh_dropped;
173 snprintf(p->errbuf, sizeof(p->errbuf),
174 "bad nit state %d", nh->nh_state);
178 bp += ((sizeof(struct nit_hdr) + nh->nh_datalen +
179 sizeof(int) - 1) & ~(sizeof(int) - 1));
181 caplen = nh->nh_wirelen;
182 if (caplen > p->snapshot)
183 caplen = p->snapshot;
184 if (pcap_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
185 struct pcap_pkthdr h;
186 h.ts = nh->nh_timestamp;
187 h.len = nh->nh_wirelen;
189 (*callback)(user, &h, cp);
190 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
202 pcap_inject_nit(pcap_t *p, const void *buf, int size)
207 memset(&sa, 0, sizeof(sa));
208 strncpy(sa.sa_data, device, sizeof(sa.sa_data));
209 ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
211 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
219 nit_setflags(pcap_t *p)
223 memset(&nioc, 0, sizeof(nioc));
224 nioc.nioc_typetomatch = NT_ALLTYPES;
225 nioc.nioc_snaplen = p->snapshot;
226 nioc.nioc_bufalign = sizeof(int);
227 nioc.nioc_bufoffset = 0;
229 if (p->opt.buffer_size != 0)
230 nioc.nioc_bufspace = p->opt.buffer_size;
232 /* Default buffer size */
233 nioc.nioc_bufspace = BUFSPACE;
236 if (p->opt.immediate) {
238 * XXX - will this cause packets to be delivered immediately?
239 * XXX - given that this is for SunOS prior to 4.0, do
242 nioc.nioc_chunksize = 0;
244 nioc.nioc_chunksize = CHUNKSIZE;
245 if (p->opt.timeout != 0) {
246 nioc.nioc_flags |= NF_TIMEOUT;
247 nioc.nioc_timeout.tv_sec = p->opt.timeout / 1000;
248 nioc.nioc_timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
251 nioc.nioc_flags |= NF_PROMISC;
253 if (ioctl(p->fd, SIOCSNIT, &nioc) < 0) {
254 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
262 pcap_activate_nit(pcap_t *p)
265 struct sockaddr_nit snit;
269 * No monitor mode on SunOS 3.x or earlier (no
270 * Wi-Fi *devices* for the hardware that supported
273 return (PCAP_ERROR_RFMON_NOTSUP);
277 * Turn a negative snapshot value (invalid), a snapshot value of
278 * 0 (unspecified), or a value bigger than the normal maximum
279 * value, into the maximum allowed value.
281 * If some application really *needs* a bigger snapshot
282 * length, we should just increase MAXIMUM_SNAPLEN.
284 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
285 p->snapshot = MAXIMUM_SNAPLEN;
287 if (p->snapshot < 96)
289 * NIT requires a snapshot length of at least 96.
293 memset(p, 0, sizeof(*p));
294 p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
296 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
300 snit.snit_family = AF_NIT;
301 (void)strncpy(snit.snit_ifname, p->opt.device, NITIFSIZ);
303 if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
305 * XXX - there's probably a particular bind error that
306 * means "there's no such device" and a particular bind
307 * error that means "that device doesn't support NIT";
308 * they might be the same error, if they both end up
309 * meaning "NIT doesn't know about that device".
311 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
312 errno, "bind: %s", snit.snit_ifname);
315 if (nit_setflags(p) < 0)
319 * NIT supports only ethernets.
321 p->linktype = DLT_EN10MB;
323 p->bufsize = BUFSPACE;
324 p->buffer = malloc(p->bufsize);
325 if (p->buffer == NULL) {
326 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
332 * "p->fd" is a socket, so "select()" should work on it.
334 p->selectable_fd = p->fd;
337 * This is (presumably) a real Ethernet capture; give it a
338 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
339 * that an application can let you choose it, in case you're
340 * capturing DOCSIS traffic that a Cisco Cable Modem
341 * Termination System is putting out onto an Ethernet (it
342 * doesn't put an Ethernet header onto the wire, it puts raw
343 * DOCSIS frames out on the wire inside the low-level
346 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
348 * If that fails, just leave the list empty.
350 if (p->dlt_list != NULL) {
351 p->dlt_list[0] = DLT_EN10MB;
352 p->dlt_list[1] = DLT_DOCSIS;
356 p->read_op = pcap_read_nit;
357 p->inject_op = pcap_inject_nit;
358 p->setfilter_op = install_bpf_program; /* no kernel filtering */
359 p->setdirection_op = NULL; /* Not implemented. */
360 p->set_datalink_op = NULL; /* can't change data link type */
361 p->getnonblock_op = pcap_getnonblock_fd;
362 p->setnonblock_op = pcap_setnonblock_fd;
363 p->stats_op = pcap_stats_nit;
367 pcap_cleanup_live_common(p);
372 pcap_create_interface(const char *device _U_, char *ebuf)
376 p = PCAP_CREATE_COMMON(ebuf, struct pcap_nit);
380 p->activate_op = pcap_activate_nit;
385 * XXX - there's probably a particular bind error that means "that device
386 * doesn't support NIT"; if so, we should try a bind and use that.
389 can_be_bound(const char *name _U_)
395 get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
399 * XXX - is there a way to find out whether an adapter has
400 * something plugged into it?
406 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
408 return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
413 * Libpcap version string.
416 pcap_lib_version(void)
418 return (PCAP_VERSION_STRING);