1 files changed, 417 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/pcap-nit.c b/lib/libpcap/libpcap/pcap-nit.c
new file mode 100644
index 0000000..6a1a77c
--- /dev/null
+++ b/lib/libpcap/libpcap/pcap-nit.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/timeb.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/nit.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcpip.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "pcap-int.h"
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+/*
+ * The chunk size for NIT.  This is the amount of buffering
+ * done for read calls.
+ */
+#define CHUNKSIZE (2*1024)
+
+/*
+ * The total buffer space used by NIT.
+ */
+#define BUFSPACE (4*CHUNKSIZE)
+
+/* Forwards */
+static int nit_setflags(int, int, int, char *);
+
+/*
+ * Private data for capturing on NIT devices.
+ */
+struct pcap_nit {
+	struct pcap_stat stat;
+};
+
+static int
+pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
+{
+	struct pcap_nit *pn = p->priv;
+
+	/*
+	 * "ps_recv" counts packets handed to the filter, not packets
+	 * that passed the filter.  As filtering is done in userland,
+	 * this does not include packets dropped because we ran out
+	 * of buffer space.
+	 *
+	 * "ps_drop" presumably counts packets dropped by the socket
+	 * because of flow control requirements or resource exhaustion;
+	 * it doesn't count packets dropped by the interface driver.
+	 * As filtering is done in userland, it counts packets regardless
+	 * of whether they would've passed the filter.
+	 *
+	 * These statistics don't include packets not yet read from the
+	 * kernel by libpcap or packets not yet read from libpcap by the
+	 * application.
+	 */
+	*ps = pn->stat;
+	return (0);
+}
+
+static int
+pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+	struct pcap_nit *pn = p->priv;
+	register int cc, n;
+	register u_char *bp, *cp, *ep;
+	register struct nit_hdr *nh;
+	register int caplen;
+
+	cc = p->cc;
+	if (cc == 0) {
+		cc = read(p->fd, (char *)p->buffer, p->bufsize);
+		if (cc < 0) {
+			if (errno == EWOULDBLOCK)
+				return (0);
+			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
+			    errno, "pcap_read");
+			return (-1);
+		}
+		bp = (u_char *)p->buffer;
+	} else
+		bp = p->bp;
+
+	/*
+	 * Loop through each packet.  The increment expression
+	 * rounds up to the next int boundary past the end of
+	 * the previous packet.
+	 */
+	n = 0;
+	ep = bp + cc;
+	while (bp < ep) {
+		/*
+		 * Has "pcap_breakloop()" been called?
+		 * If so, return immediately - if we haven't read any
+		 * packets, clear the flag and return -2 to indicate
+		 * that we were told to break out of the loop, otherwise
+		 * leave the flag set, so that the *next* call will break
+		 * out of the loop without having read any packets, and
+		 * return the number of packets we've processed so far.
+		 */
+		if (p->break_loop) {
+			if (n == 0) {
+				p->break_loop = 0;
+				return (-2);
+			} else {
+				p->cc = ep - bp;
+				p->bp = bp;
+				return (n);
+			}
+		}
+
+		nh = (struct nit_hdr *)bp;
+		cp = bp + sizeof(*nh);
+
+		switch (nh->nh_state) {
+
+		case NIT_CATCH:
+			break;
+
+		case NIT_NOMBUF:
+		case NIT_NOCLUSTER:
+		case NIT_NOSPACE:
+			pn->stat.ps_drop = nh->nh_dropped;
+			continue;
+
+		case NIT_SEQNO:
+			continue;
+
+		default:
+			pcap_snprintf(p->errbuf, sizeof(p->errbuf),
+			    "bad nit state %d", nh->nh_state);
+			return (-1);
+		}
+		++pn->stat.ps_recv;
+		bp += ((sizeof(struct nit_hdr) + nh->nh_datalen +
+		    sizeof(int) - 1) & ~(sizeof(int) - 1));
+
+		caplen = nh->nh_wirelen;
+		if (caplen > p->snapshot)
+			caplen = p->snapshot;
+		if (bpf_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
+			struct pcap_pkthdr h;
+			h.ts = nh->nh_timestamp;
+			h.len = nh->nh_wirelen;
+			h.caplen = caplen;
+			(*callback)(user, &h, cp);
+			if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
+				p->cc = ep - bp;
+				p->bp = bp;
+				return (n);
+			}
+		}
+	}
+	p->cc = 0;
+	return (n);
+}
+
+static int
+pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
+{
+	struct sockaddr sa;
+	int ret;
+
+	memset(&sa, 0, sizeof(sa));
+	strncpy(sa.sa_data, device, sizeof(sa.sa_data));
+	ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
+	if (ret == -1) {
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "send");
+		return (-1);
+	}
+	return (ret);
+}
+
+static int
+nit_setflags(pcap_t *p)
+{
+	struct nit_ioc nioc;
+
+	memset(&nioc, 0, sizeof(nioc));
+	nioc.nioc_typetomatch = NT_ALLTYPES;
+	nioc.nioc_snaplen = p->snapshot;
+	nioc.nioc_bufalign = sizeof(int);
+	nioc.nioc_bufoffset = 0;
+
+	if (p->opt.buffer_size != 0)
+		nioc.nioc_bufspace = p->opt.buffer_size;
+	else {
+		/* Default buffer size */
+		nioc.nioc_bufspace = BUFSPACE;
+	}
+
+	if (p->opt.immediate) {
+		/*
+		 * XXX - will this cause packets to be delivered immediately?
+		 * XXX - given that this is for SunOS prior to 4.0, do
+		 * we care?
+		 */
+		nioc.nioc_chunksize = 0;
+	} else
+		nioc.nioc_chunksize = CHUNKSIZE;
+	if (p->opt.timeout != 0) {
+		nioc.nioc_flags |= NF_TIMEOUT;
+		nioc.nioc_timeout.tv_sec = p->opt.timeout / 1000;
+		nioc.nioc_timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
+	}
+	if (p->opt.promisc)
+		nioc.nioc_flags |= NF_PROMISC;
+
+	if (ioctl(p->fd, SIOCSNIT, &nioc) < 0) {
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "SIOCSNIT");
+		return (-1);
+	}
+	return (0);
+}
+
+static int
+pcap_activate_nit(pcap_t *p)
+{
+	int fd;
+	struct sockaddr_nit snit;
+
+	if (p->opt.rfmon) {
+		/*
+		 * No monitor mode on SunOS 3.x or earlier (no
+		 * Wi-Fi *devices* for the hardware that supported
+		 * them!).
+		 */
+		return (PCAP_ERROR_RFMON_NOTSUP);
+	}
+
+	/*
+	 * Turn a negative snapshot value (invalid), a snapshot value of
+	 * 0 (unspecified), or a value bigger than the normal maximum
+	 * value, into the maximum allowed value.
+	 *
+	 * If some application really *needs* a bigger snapshot
+	 * length, we should just increase MAXIMUM_SNAPLEN.
+	 */
+	if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
+		p->snapshot = MAXIMUM_SNAPLEN;
+
+	if (p->snapshot < 96)
+		/*
+		 * NIT requires a snapshot length of at least 96.
+		 */
+		p->snapshot = 96;
+
+	memset(p, 0, sizeof(*p));
+	p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
+	if (fd < 0) {
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "socket");
+		goto bad;
+	}
+	snit.snit_family = AF_NIT;
+	(void)strncpy(snit.snit_ifname, p->opt.device, NITIFSIZ);
+
+	if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
+		/*
+		 * XXX - there's probably a particular bind error that
+		 * means "there's no such device" and a particular bind
+		 * error that means "that device doesn't support NIT";
+		 * they might be the same error, if they both end up
+		 * meaning "NIT doesn't know about that device".
+		 */
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "bind: %s", snit.snit_ifname);
+		goto bad;
+	}
+	if (nit_setflags(p) < 0)
+		goto bad;
+
+	/*
+	 * NIT supports only ethernets.
+	 */
+	p->linktype = DLT_EN10MB;
+
+	p->bufsize = BUFSPACE;
+	p->buffer = malloc(p->bufsize);
+	if (p->buffer == NULL) {
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "malloc");
+		goto bad;
+	}
+
+	/*
+	 * "p->fd" is a socket, so "select()" should work on it.
+	 */
+	p->selectable_fd = p->fd;
+
+	/*
+	 * This is (presumably) a real Ethernet capture; give it a
+	 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
+	 * that an application can let you choose it, in case you're
+	 * capturing DOCSIS traffic that a Cisco Cable Modem
+	 * Termination System is putting out onto an Ethernet (it
+	 * doesn't put an Ethernet header onto the wire, it puts raw
+	 * DOCSIS frames out on the wire inside the low-level
+	 * Ethernet framing).
+	 */
+	p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
+	/*
+	 * If that fails, just leave the list empty.
+	 */
+	if (p->dlt_list != NULL) {
+		p->dlt_list[0] = DLT_EN10MB;
+		p->dlt_list[1] = DLT_DOCSIS;
+		p->dlt_count = 2;
+	}
+
+	p->read_op = pcap_read_nit;
+	p->inject_op = pcap_inject_nit;
+	p->setfilter_op = install_bpf_program;	/* no kernel filtering */
+	p->setdirection_op = NULL;	/* Not implemented. */
+	p->set_datalink_op = NULL;	/* can't change data link type */
+	p->getnonblock_op = pcap_getnonblock_fd;
+	p->setnonblock_op = pcap_setnonblock_fd;
+	p->stats_op = pcap_stats_nit;
+
+	return (0);
+ bad:
+	pcap_cleanup_live_common(p);
+	return (PCAP_ERROR);
+}
+
+pcap_t *
+pcap_create_interface(const char *device _U_, char *ebuf)
+{
+	pcap_t *p;
+
+	p = pcap_create_common(ebuf, sizeof (struct pcap_nit));
+	if (p == NULL)
+		return (NULL);
+
+	p->activate_op = pcap_activate_nit;
+	return (p);
+}
+
+/*
+ * XXX - there's probably a particular bind error that means "that device
+ * doesn't support NIT"; if so, we should try a bind and use that.
+ */
+static int
+can_be_bound(const char *name _U_)
+{
+	return (1);
+}
+
+static int
+get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
+{
+	/*
+	 * Nothing we can do.
+	 * XXX - is there a way to find out whether an adapter has
+	 * something plugged into it?
+	 */
+	return (0);
+}
+
+int
+pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
+{
+	return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
+	    get_if_flags));
+}
+
+/*
+ * Libpcap version string.
+ */
+const char *
+pcap_lib_version(void)
+{
+	return (PCAP_VERSION_STRING);
+}