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12 * ``This product includes software developed by the University of California,
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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>
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_snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
118 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
210 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
253 pcap_strerror(errno));
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);
274 if (p->snapshot < 96)
276 * NIT requires a snapshot length of at least 96.
280 memset(p, 0, sizeof(*p));
281 p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
283 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
284 "socket: %s", pcap_strerror(errno));
287 snit.snit_family = AF_NIT;
288 (void)strncpy(snit.snit_ifname, p->opt.device, NITIFSIZ);
290 if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
292 * XXX - there's probably a particular bind error that
293 * means "there's no such device" and a particular bind
294 * error that means "that device doesn't support NIT";
295 * they might be the same error, if they both end up
296 * meaning "NIT doesn't know about that device".
298 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
299 "bind: %s: %s", snit.snit_ifname, pcap_strerror(errno));
302 if (nit_setflags(p) < 0)
306 * NIT supports only ethernets.
308 p->linktype = DLT_EN10MB;
310 p->bufsize = BUFSPACE;
311 p->buffer = malloc(p->bufsize);
312 if (p->buffer == NULL) {
313 strlcpy(p->errbuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
318 * "p->fd" is a socket, so "select()" should work on it.
320 p->selectable_fd = p->fd;
323 * This is (presumably) a real Ethernet capture; give it a
324 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
325 * that an application can let you choose it, in case you're
326 * capturing DOCSIS traffic that a Cisco Cable Modem
327 * Termination System is putting out onto an Ethernet (it
328 * doesn't put an Ethernet header onto the wire, it puts raw
329 * DOCSIS frames out on the wire inside the low-level
332 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
334 * If that fails, just leave the list empty.
336 if (p->dlt_list != NULL) {
337 p->dlt_list[0] = DLT_EN10MB;
338 p->dlt_list[1] = DLT_DOCSIS;
342 p->read_op = pcap_read_nit;
343 p->inject_op = pcap_inject_nit;
344 p->setfilter_op = install_bpf_program; /* no kernel filtering */
345 p->setdirection_op = NULL; /* Not implemented. */
346 p->set_datalink_op = NULL; /* can't change data link type */
347 p->getnonblock_op = pcap_getnonblock_fd;
348 p->setnonblock_op = pcap_setnonblock_fd;
349 p->stats_op = pcap_stats_nit;
353 pcap_cleanup_live_common(p);
358 pcap_create_interface(const char *device _U_, char *ebuf)
362 p = pcap_create_common(ebuf, sizeof (struct pcap_nit));
366 p->activate_op = pcap_activate_nit;
371 * XXX - there's probably a particular bind error that means "that device
372 * doesn't support NIT"; if so, we should try a bind and use that.
375 can_be_bound(const char *name _U_)
381 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
383 return (pcap_findalldevs_interfaces(alldevsp, errbuf, can_be_bound));