auto import from //depot/cupcake/@135843
diff --git a/pcap-pf.c b/pcap-pf.c
new file mode 100644
index 0000000..e733540
--- /dev/null
+++ b/pcap-pf.c
@@ -0,0 +1,610 @@
+/*
+ * 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.
+ *
+ * packet filter subroutines for tcpdump
+ * Extraction/creation by Jeffrey Mogul, DECWRL
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.91.2.2 2005/05/03 18:54:37 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/timeb.h>
+#include <sys/socket.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <net/pfilt.h>
+
+struct mbuf;
+struct rtentry;
+#include <net/if.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 <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * Make "pcap.h" not include "pcap-bpf.h"; we are going to include the
+ * native OS version, as we need various BPF ioctls from it.
+ */
+#define PCAP_DONT_INCLUDE_PCAP_BPF_H
+#include <net/bpf.h>
+
+#include "pcap-int.h"
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+static int pcap_setfilter_pf(pcap_t *, struct bpf_program *);
+
+/*
+ * BUFSPACE is the size in bytes of the packet read buffer. Most tcpdump
+ * applications aren't going to need more than 200 bytes of packet header
+ * and the read shouldn't return more packets than packetfilter's internal
+ * queue limit (bounded at 256).
+ */
+#define BUFSPACE (200 * 256)
+
+static int
+pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
+{
+ register u_char *p, *bp;
+ struct bpf_insn *fcode;
+ register int cc, n, buflen, inc;
+ register struct enstamp *sp;
+#ifdef LBL_ALIGN
+ struct enstamp stamp;
+#endif
+#ifdef PCAP_FDDIPAD
+ register int pad;
+#endif
+
+ fcode = pc->md.use_bpf ? NULL : pc->fcode.bf_insns;
+ again:
+ cc = pc->cc;
+ if (cc == 0) {
+ cc = read(pc->fd, (char *)pc->buffer + pc->offset, pc->bufsize);
+ if (cc < 0) {
+ if (errno == EWOULDBLOCK)
+ return (0);
+ if (errno == EINVAL &&
+ lseek(pc->fd, 0L, SEEK_CUR) + pc->bufsize < 0) {
+ /*
+ * Due to a kernel bug, after 2^31 bytes,
+ * the kernel file offset overflows and
+ * read fails with EINVAL. The lseek()
+ * to 0 will fix things.
+ */
+ (void)lseek(pc->fd, 0L, SEEK_SET);
+ goto again;
+ }
+ snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
+ pcap_strerror(errno));
+ return (-1);
+ }
+ bp = pc->buffer + pc->offset;
+ } else
+ bp = pc->bp;
+ /*
+ * Loop through each packet.
+ */
+ n = 0;
+#ifdef PCAP_FDDIPAD
+ pad = pc->fddipad;
+#endif
+ while (cc > 0) {
+ /*
+ * 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 (pc->break_loop) {
+ if (n == 0) {
+ pc->break_loop = 0;
+ return (-2);
+ } else {
+ pc->cc = cc;
+ pc->bp = bp;
+ return (n);
+ }
+ }
+ if (cc < sizeof(*sp)) {
+ snprintf(pc->errbuf, sizeof(pc->errbuf),
+ "pf short read (%d)", cc);
+ return (-1);
+ }
+#ifdef LBL_ALIGN
+ if ((long)bp & 3) {
+ sp = &stamp;
+ memcpy((char *)sp, (char *)bp, sizeof(*sp));
+ } else
+#endif
+ sp = (struct enstamp *)bp;
+ if (sp->ens_stamplen != sizeof(*sp)) {
+ snprintf(pc->errbuf, sizeof(pc->errbuf),
+ "pf short stamplen (%d)",
+ sp->ens_stamplen);
+ return (-1);
+ }
+
+ p = bp + sp->ens_stamplen;
+ buflen = sp->ens_count;
+ if (buflen > pc->snapshot)
+ buflen = pc->snapshot;
+
+ /* Calculate inc before possible pad update */
+ inc = ENALIGN(buflen + sp->ens_stamplen);
+ cc -= inc;
+ bp += inc;
+ pc->md.TotPkts++;
+ pc->md.TotDrops += sp->ens_dropped;
+ pc->md.TotMissed = sp->ens_ifoverflows;
+ if (pc->md.OrigMissed < 0)
+ pc->md.OrigMissed = pc->md.TotMissed;
+
+ /*
+ * Short-circuit evaluation: if using BPF filter
+ * in kernel, no need to do it now.
+ *
+#ifdef PCAP_FDDIPAD
+ * Note: the filter code was generated assuming
+ * that pc->fddipad was the amount of padding
+ * before the header, as that's what's required
+ * in the kernel, so we run the filter before
+ * skipping that padding.
+#endif
+ */
+ if (fcode == NULL ||
+ bpf_filter(fcode, p, sp->ens_count, buflen)) {
+ struct pcap_pkthdr h;
+ pc->md.TotAccepted++;
+ h.ts = sp->ens_tstamp;
+#ifdef PCAP_FDDIPAD
+ h.len = sp->ens_count - pad;
+#else
+ h.len = sp->ens_count;
+#endif
+#ifdef PCAP_FDDIPAD
+ p += pad;
+ buflen -= pad;
+#endif
+ h.caplen = buflen;
+ (*callback)(user, &h, p);
+ if (++n >= cnt && cnt > 0) {
+ pc->cc = cc;
+ pc->bp = bp;
+ return (n);
+ }
+ }
+ }
+ pc->cc = 0;
+ return (n);
+}
+
+static int
+pcap_inject_pf(pcap_t *p, const void *buf, size_t size)
+{
+ int ret;
+
+ ret = write(p->fd, buf, size);
+ if (ret == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
+ pcap_strerror(errno));
+ return (-1);
+ }
+ return (ret);
+}
+
+static int
+pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
+{
+
+ /*
+ * If packet filtering is being done in the kernel:
+ *
+ * "ps_recv" counts only packets that passed the filter.
+ * This does not include packets dropped because we
+ * ran out of buffer space. (XXX - perhaps it should,
+ * by adding "ps_drop" to "ps_recv", for compatibility
+ * with some other platforms. On the other hand, on
+ * some platforms "ps_recv" counts only packets that
+ * passed the filter, and on others it counts packets
+ * that didn't pass the filter....)
+ *
+ * "ps_drop" counts packets that passed the kernel filter
+ * (if any) but were dropped because the input queue was
+ * full.
+ *
+ * "ps_ifdrop" counts packets dropped by the network
+ * inteface (regardless of whether they would have passed
+ * the input filter, of course).
+ *
+ * If packet filtering is not being done in the kernel:
+ *
+ * "ps_recv" counts only packets that passed the filter.
+ *
+ * "ps_drop" counts packets that were dropped because the
+ * input queue was full, regardless of whether they passed
+ * the userland filter.
+ *
+ * "ps_ifdrop" counts packets dropped by the network
+ * inteface (regardless of whether they would have passed
+ * the input filter, of course).
+ *
+ * These statistics don't include packets not yet read from
+ * the kernel by libpcap, but they may include packets not
+ * yet read from libpcap by the application.
+ */
+ ps->ps_recv = p->md.TotAccepted;
+ ps->ps_drop = p->md.TotDrops;
+ ps->ps_ifdrop = p->md.TotMissed - p->md.OrigMissed;
+ return (0);
+}
+
+/*
+ * We include the OS's <net/bpf.h>, not our "pcap-bpf.h", so we probably
+ * don't get DLT_DOCSIS defined.
+ */
+#ifndef DLT_DOCSIS
+#define DLT_DOCSIS 143
+#endif
+
+pcap_t *
+pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
+ char *ebuf)
+{
+ pcap_t *p;
+ short enmode;
+ int backlog = -1; /* request the most */
+ struct enfilter Filter;
+ struct endevp devparams;
+
+ p = (pcap_t *)malloc(sizeof(*p));
+ if (p == NULL) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ "pcap_open_live: %s", pcap_strerror(errno));
+ return (0);
+ }
+ memset(p, 0, sizeof(*p));
+ /*
+ * Initially try a read/write open (to allow the inject
+ * method to work). If that fails due to permission
+ * issues, fall back to read-only. This allows a
+ * non-root user to be granted specific access to pcap
+ * capabilities via file permissions.
+ *
+ * XXX - we should have an API that has a flag that
+ * controls whether to open read-only or read-write,
+ * so that denial of permission to send (or inability
+ * to send, if sending packets isn't supported on
+ * the device in question) can be indicated at open
+ * time.
+ *
+ * XXX - we assume here that "pfopen()" does not, in fact, modify
+ * its argument, even though it takes a "char *" rather than a
+ * "const char *" as its first argument. That appears to be
+ * the case, at least on Digital UNIX 4.0.
+ */
+ p->fd = pfopen(device, O_RDWR);
+ if (p->fd == -1 && errno == EACCES)
+ p->fd = pfopen(device, O_RDONLY);
+ if (p->fd < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "pf open: %s: %s\n\
+your system may not be properly configured; see the packetfilter(4) man page\n",
+ device, pcap_strerror(errno));
+ goto bad;
+ }
+ p->md.OrigMissed = -1;
+ enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
+ if (promisc)
+ enmode |= ENPROMISC;
+ if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+#ifdef ENCOPYALL
+ /* Try to set COPYALL mode so that we see packets to ourself */
+ enmode = ENCOPYALL;
+ (void)ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode);/* OK if this fails */
+#endif
+ /* set the backlog */
+ if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ /* discover interface type */
+ if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ /* HACK: to compile prior to Ultrix 4.2 */
+#ifndef ENDT_FDDI
+#define ENDT_FDDI 4
+#endif
+ switch (devparams.end_dev_type) {
+
+ case ENDT_10MB:
+ p->linktype = DLT_EN10MB;
+ p->offset = 2;
+ /*
+ * 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;
+ }
+ break;
+
+ case ENDT_FDDI:
+ p->linktype = DLT_FDDI;
+ break;
+
+#ifdef ENDT_SLIP
+ case ENDT_SLIP:
+ p->linktype = DLT_SLIP;
+ break;
+#endif
+
+#ifdef ENDT_PPP
+ case ENDT_PPP:
+ p->linktype = DLT_PPP;
+ break;
+#endif
+
+#ifdef ENDT_LOOPBACK
+ case ENDT_LOOPBACK:
+ /*
+ * It appears to use Ethernet framing, at least on
+ * Digital UNIX 4.0.
+ */
+ p->linktype = DLT_EN10MB;
+ p->offset = 2;
+ break;
+#endif
+
+#ifdef ENDT_TRN
+ case ENDT_TRN:
+ p->linktype = DLT_IEEE802;
+ break;
+#endif
+
+ default:
+ /*
+ * XXX - what about ENDT_IEEE802? The pfilt.h header
+ * file calls this "IEEE 802 networks (non-Ethernet)",
+ * but that doesn't specify a specific link layer type;
+ * it could be 802.4, or 802.5 (except that 802.5 is
+ * ENDT_TRN), or 802.6, or 802.11, or.... That's why
+ * DLT_IEEE802 was hijacked to mean Token Ring in various
+ * BSDs, and why we went along with that hijacking.
+ *
+ * XXX - what about ENDT_HDLC and ENDT_NULL?
+ * Presumably, as ENDT_OTHER is just "Miscellaneous
+ * framing", there's not much we can do, as that
+ * doesn't specify a particular type of header.
+ */
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown data-link type %u",
+ devparams.end_dev_type);
+ goto bad;
+ }
+ /* set truncation */
+#ifdef PCAP_FDDIPAD
+ if (p->linktype == DLT_FDDI) {
+ p->fddipad = PCAP_FDDIPAD;
+
+ /* packetfilter includes the padding in the snapshot */
+ snaplen += PCAP_FDDIPAD;
+ } else
+ p->fddipad = 0;
+#endif
+ if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&snaplen) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ p->snapshot = snaplen;
+ /* accept all packets */
+ memset(&Filter, 0, sizeof(Filter));
+ Filter.enf_Priority = 37; /* anything > 2 */
+ Filter.enf_FilterLen = 0; /* means "always true" */
+ if (ioctl(p->fd, EIOCSETF, (caddr_t)&Filter) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETF: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+
+ if (to_ms != 0) {
+ struct timeval timeout;
+ timeout.tv_sec = to_ms / 1000;
+ timeout.tv_usec = (to_ms * 1000) % 1000000;
+ if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ }
+
+ p->bufsize = BUFSPACE;
+ p->buffer = (u_char*)malloc(p->bufsize + p->offset);
+ if (p->buffer == NULL) {
+ strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+ goto bad;
+ }
+
+ /*
+ * "select()" and "poll()" work on packetfilter devices.
+ */
+ p->selectable_fd = p->fd;
+
+ p->read_op = pcap_read_pf;
+ p->inject_op = pcap_inject_pf;
+ p->setfilter_op = pcap_setfilter_pf;
+ 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_pf;
+ p->close_op = pcap_close_common;
+
+ return (p);
+ bad:
+ if (p->fd >= 0)
+ close(p->fd);
+ /*
+ * Get rid of any link-layer type list we allocated.
+ */
+ if (p->dlt_list != NULL)
+ free(p->dlt_list);
+ free(p);
+ return (NULL);
+}
+
+int
+pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+{
+ return (0);
+}
+
+static int
+pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
+{
+ struct bpf_version bv;
+
+ /*
+ * See if BIOCVERSION works. If not, we assume the kernel doesn't
+ * support BPF-style filters (it's not documented in the bpf(7)
+ * or packetfiler(7) man pages, but the code used to fail if
+ * BIOCSETF worked but BIOCVERSION didn't, and I've seen it do
+ * kernel filtering in DU 4.0, so presumably BIOCVERSION works
+ * there, at least).
+ */
+ if (ioctl(p->fd, BIOCVERSION, (caddr_t)&bv) >= 0) {
+ /*
+ * OK, we have the version of the BPF interpreter;
+ * is it the same major version as us, and the same
+ * or better minor version?
+ */
+ if (bv.bv_major == BPF_MAJOR_VERSION &&
+ bv.bv_minor >= BPF_MINOR_VERSION) {
+ /*
+ * Yes. Try to install the filter.
+ */
+ if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
+ snprintf(p->errbuf, sizeof(p->errbuf),
+ "BIOCSETF: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ /*
+ * OK, that succeeded. We're doing filtering in
+ * the kernel. (We assume we don't have a
+ * userland filter installed - that'd require
+ * a previous version check to have failed but
+ * this one to succeed.)
+ *
+ * XXX - this message should be supplied to the
+ * application as a warning of some sort,
+ * except that if it's a GUI application, it's
+ * not clear that it should be displayed in
+ * a window to annoy the user.
+ */
+ fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
+ p->md.use_bpf = 1;
+
+ /*
+ * Discard any previously-received packets,
+ * as they might have passed whatever filter
+ * was formerly in effect, but might not pass
+ * this filter (BIOCSETF discards packets buffered
+ * in the kernel, so you can lose packets in any
+ * case).
+ */
+ p->cc = 0;
+ return (0);
+ }
+
+ /*
+ * We can't use the kernel's BPF interpreter; don't give
+ * up, just log a message and be inefficient.
+ *
+ * XXX - this should really be supplied to the application
+ * as a warning of some sort.
+ */
+ fprintf(stderr,
+ "tcpdump: Requires BPF language %d.%d or higher; kernel is %d.%d\n",
+ BPF_MAJOR_VERSION, BPF_MINOR_VERSION,
+ bv.bv_major, bv.bv_minor);
+ }
+
+ /*
+ * We couldn't do filtering in the kernel; do it in userland.
+ */
+ if (install_bpf_program(p, fp) < 0)
+ return (-1);
+
+ /*
+ * XXX - this message should be supplied by the application as
+ * a warning of some sort.
+ */
+ fprintf(stderr, "tcpdump: Filtering in user process\n");
+ p->md.use_bpf = 0;
+ return (0);
+}