* Extraction/creation by Jeffrey Mogul, DECWRL
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.88 2004-10-19 07:06:13 guy Exp $ (LBL)";
-#endif
-
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
#include <sys/types.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
-#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
/*
- * Make "pcap.h" not include "pcap-bpf.h"; we are going to include the
+ * 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 "os-proto.h"
#endif
+/*
+ * FDDI packets are padded to make everything line up on a nice boundary.
+ */
+#define PCAP_FDDIPAD 3
+
+/*
+ * Private data for capturing on Ultrix and DEC OSF/1^WDigital UNIX^W^W
+ * Tru64 UNIX packetfilter devices.
+ */
+struct pcap_pf {
+ int filtering_in_kernel; /* using kernel filter */
+ u_long TotPkts; /* can't oflow for 79 hrs on ether */
+ u_long TotAccepted; /* count accepted by filter */
+ u_long TotDrops; /* count of dropped packets */
+ long TotMissed; /* missed by i/f during this run */
+ long OrigMissed; /* missed by i/f before this run */
+};
+
static int pcap_setfilter_pf(pcap_t *, struct bpf_program *);
/*
static int
pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
{
+ struct pcap_pf *pf = pc->priv;
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
+ register u_int pad;
- fcode = pc->md.use_bpf ? NULL : pc->fcode.bf_insns;
again:
cc = pc->cc;
if (cc == 0) {
(void)lseek(pc->fd, 0L, SEEK_SET);
goto again;
}
- snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(pc->errbuf,
+ sizeof(pc->errbuf), errno, "pf read");
return (-1);
}
- bp = pc->buffer + pc->offset;
+ bp = (u_char *)pc->buffer + pc->offset;
} else
bp = pc->bp;
/*
* Loop through each packet.
+ *
+ * This assumes that a single buffer of packets will have
+ * <= INT_MAX packets, so the packet count doesn't overflow.
*/
n = 0;
-#ifdef PCAP_FDDIPAD
- if (pc->linktype == DLT_FDDI)
- pad = pcap_fddipad;
- else
- pad = 0;
-#endif
+ pad = pc->fddipad;
while (cc > 0) {
/*
* Has "pcap_breakloop()" been called?
"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),
inc = ENALIGN(buflen + sp->ens_stamplen);
cc -= inc;
bp += inc;
-#ifdef PCAP_FDDIPAD
- p += pad;
- buflen -= pad;
-#endif
- 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;
+ pf->TotPkts++;
+ pf->TotDrops += sp->ens_dropped;
+ pf->TotMissed = sp->ens_ifoverflows;
+ if (pf->OrigMissed < 0)
+ pf->OrigMissed = pf->TotMissed;
/*
* Short-circuit evaluation: if using BPF filter
- * in kernel, no need to do it now.
+ * in kernel, no need to do it now - we already know
+ * the packet passed the filter.
+ *
+ * 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.
*/
- if (fcode == NULL ||
- bpf_filter(fcode, p, sp->ens_count, buflen)) {
+ if (pf->filtering_in_kernel ||
+ pcap_filter(pc->fcode.bf_insns, p, sp->ens_count, buflen)) {
struct pcap_pkthdr h;
- pc->md.TotAccepted++;
+ pf->TotAccepted++;
h.ts = sp->ens_tstamp;
-#ifdef PCAP_FDDIPAD
h.len = sp->ens_count - pad;
-#else
- h.len = sp->ens_count;
-#endif
+ p += pad;
+ buflen -= pad;
h.caplen = buflen;
(*callback)(user, &h, p);
- if (++n >= cnt && cnt > 0) {
+ if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
pc->cc = cc;
pc->bp = bp;
return (n);
}
static int
-pcap_inject_pf(pcap_t *p, const void *buf, size_t size)
+pcap_inject_pf(pcap_t *p, const void *buf, int size)
{
int ret;
ret = write(p->fd, buf, size);
if (ret == -1) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "send");
return (-1);
}
return (ret);
-}
+}
static int
pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
{
+ struct pcap_pf *pf = p->priv;
/*
* If packet filtering is being done in the kernel:
* full.
*
* "ps_ifdrop" counts packets dropped by the network
- * inteface (regardless of whether they would have passed
+ * interface (regardless of whether they would have passed
* the input filter, of course).
*
* If packet filtering is not being done in the kernel:
* the userland filter.
*
* "ps_ifdrop" counts packets dropped by the network
- * inteface (regardless of whether they would have passed
+ * interface (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;
+ ps->ps_recv = pf->TotAccepted;
+ ps->ps_drop = pf->TotDrops;
+ ps->ps_ifdrop = pf->TotMissed - pf->OrigMissed;
return (0);
}
/*
- * We include the OS's <net/bpf.h>, not our "pcap-bpf.h", so we probably
+ * 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)
+static int
+pcap_activate_pf(pcap_t *p)
{
- pcap_t *p;
+ struct pcap_pf *pf = p->priv;
short enmode;
int backlog = -1; /* request the most */
struct enfilter Filter;
struct endevp devparams;
+ int err;
- 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
* 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.
+ *
+ * XXX - is there an error that means "no such device"? Is
+ * there one that means "that device doesn't support pf"?
*/
- p->fd = pfopen(device, O_RDWR);
+ p->fd = pfopen(p->opt.device, O_RDWR);
if (p->fd == -1 && errno == EACCES)
- p->fd = pfopen(device, O_RDONLY);
+ p->fd = pfopen(p->opt.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));
+ if (errno == EACCES) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "pf open: %s: Permission denied\n"
+"your system may not be properly configured; see the packetfilter(4) man page",
+ p->opt.device);
+ err = PCAP_ERROR_PERM_DENIED;
+ } else {
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "pf open: %s", p->opt.device);
+ err = PCAP_ERROR;
+ }
goto bad;
}
- p->md.OrigMissed = -1;
- enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
- if (promisc)
+
+ /*
+ * 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;
+
+ pf->OrigMissed = -1;
+ enmode = ENTSTAMP|ENNONEXCL;
+ if (!p->opt.immediate)
+ enmode |= ENBATCH;
+ if (p->opt.promisc)
enmode |= ENPROMISC;
if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCMBIS");
+ err = PCAP_ERROR;
goto bad;
}
#ifdef ENCOPYALL
#endif
/* set the backlog */
if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSETW");
+ err = PCAP_ERROR;
goto bad;
}
/* discover interface type */
if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCDEVP");
+ err = PCAP_ERROR;
goto bad;
}
/* HACK: to compile prior to Ultrix 4.2 */
* 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);
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "unknown data-link type %u", devparams.end_dev_type);
+ err = PCAP_ERROR;
goto bad;
}
/* set truncation */
-#ifdef PCAP_FDDIPAD
- if (p->linktype == DLT_FDDI)
+ if (p->linktype == DLT_FDDI) {
+ p->fddipad = PCAP_FDDIPAD;
+
/* packetfilter includes the padding in the snapshot */
- snaplen += pcap_fddipad;
-#endif
- if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&snaplen) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
- pcap_strerror(errno));
+ p->snapshot += PCAP_FDDIPAD;
+ } else
+ p->fddipad = 0;
+ if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&p->snapshot) < 0) {
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCTRUNCATE");
+ err = PCAP_ERROR;
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));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSETF");
+ err = PCAP_ERROR;
goto bad;
}
- if (to_ms != 0) {
+ if (p->opt.timeout != 0) {
struct timeval timeout;
- timeout.tv_sec = to_ms / 1000;
- timeout.tv_usec = (to_ms * 1000) % 1000000;
+ timeout.tv_sec = p->opt.timeout / 1000;
+ timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSRTIMEOUT");
+ err = PCAP_ERROR;
goto bad;
}
}
p->bufsize = BUFSPACE;
- p->buffer = (u_char*)malloc(p->bufsize + p->offset);
+ p->buffer = malloc(p->bufsize + p->offset);
if (p->buffer == NULL) {
- strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "malloc");
+ err = PCAP_ERROR;
goto bad;
}
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);
+ return (0);
bad:
- if (p->fd >= 0)
- close(p->fd);
+ pcap_cleanup_live_common(p);
+ return (err);
+}
+
+pcap_t *
+pcap_create_interface(const char *device _U_, char *ebuf)
+{
+ pcap_t *p;
+
+ p = PCAP_CREATE_COMMON(ebuf, struct pcap_pf);
+ if (p == NULL)
+ return (NULL);
+
+ p->activate_op = pcap_activate_pf;
+ return (p);
+}
+
+/*
+ * XXX - is there an error from pfopen() that means "no such device"?
+ * Is there one that means "that device doesn't support pf"?
+ */
+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_)
+{
/*
- * Get rid of any link-layer type list we allocated.
+ * Nothing we can do other than mark loopback devices as "the
+ * connected/disconnected status doesn't apply".
+ *
+ * XXX - is there a way to find out whether an adapter has
+ * something plugged into it?
*/
- if (p->dlt_list != NULL)
- free(p->dlt_list);
- free(p);
- return (NULL);
+ if (*flags & PCAP_IF_LOOPBACK) {
+ /*
+ * Loopback devices aren't wireless, and "connected"/
+ * "disconnected" doesn't apply to them.
+ */
+ *flags |= PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE;
+ return (0);
+ }
+ return (0);
}
int
-pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
{
- return (0);
+ return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
+ get_if_flags));
}
static int
pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
{
+ struct pcap_pf *pf = p->priv;
struct bpf_version bv;
/*
* 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));
+ pcap_fmt_errmsg_for_errno(p->errbuf,
+ sizeof(p->errbuf), errno, "BIOCSETF");
return (-1);
}
* a window to annoy the user.
*/
fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
- p->md.use_bpf = 1;
+ pf->filtering_in_kernel = 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);
}
* a warning of some sort.
*/
fprintf(stderr, "tcpdump: Filtering in user process\n");
- p->md.use_bpf = 0;
+ pf->filtering_in_kernel = 0;
return (0);
}
+
+/*
+ * Libpcap version string.
+ */
+const char *
+pcap_lib_version(void)
+{
+ return (PCAP_VERSION_STRING);
+}
projects / libpcap / blobdiff