Merge remote-tracking branch 'goog/tcpdump'
* goog/tcpdump: (1872 commits)
Remove old version. Getting ready for new libpcap 1.5
Remove commas from clauses in a comma-separated list.
Fix typo.
Describe all NFLOG TLV types and define structures for some of them.
Check caplen in the NFLOG TLV loop.
Have nflog_tlv_t include only the TLV header.
Byte-swap the T and L in TLVs as necessary when reading an NFLOG file.
Don't support D-Bus sniffing on OS X.
Add post-1.5.2 bug fixes.
Tag some changes with a bug identifier.
Add items for 1.5.1 and 1.5.2.
Formatting tweak.
Count *ring buffer blocks*, not *packets* to be filtered in userland.
Add a PACKET_COUNT_IS_UNLIMITED() to test for a packet count <= 0.
Use HAVE_TPACKET3 rather than TPACKET_V3 to test for TPACKET_V3 support.
Fix builds on systems without TPACKET_V3.
tweak manpages formatting
Fix pcap_loop() with a count of 0 and TPACKET_V3.
Discourage the use of a zero timeout.
We can't use TPACKET_V3 in immediate mode, so fall back on TPACKET_V2.
...
Change-Id: I2aa9bd87673c56aee439e1154b96a14026ca7985
diff --git a/pcap-bpf.c b/pcap-bpf.c
index 027913e..250298a 100644
--- a/pcap-bpf.c
+++ b/pcap-bpf.c
@@ -20,7 +20,7 @@
*/
#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.86.2.12 2007/06/15 17:57:27 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.116 2008-09-16 18:42:29 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@@ -28,19 +28,40 @@
#endif
#include <sys/param.h> /* optionally get BSD define */
-#include <sys/time.h>
-#include <sys/timeb.h>
+#ifdef HAVE_ZEROCOPY_BPF
+#include <sys/mman.h>
+#endif
#include <sys/socket.h>
-#include <sys/file.h>
+#include <time.h>
+/*
+ * <net/bpf.h> defines ioctls, but doesn't include <sys/ioccom.h>.
+ *
+ * We include <sys/ioctl.h> as it might be necessary to declare ioctl();
+ * at least on *BSD and Mac OS X, it also defines various SIOC ioctls -
+ * we could include <sys/sockio.h>, but if we're already including
+ * <sys/ioctl.h>, which includes <sys/sockio.h> on those platforms,
+ * there's not much point in doing so.
+ *
+ * If we have <sys/ioccom.h>, we include it as well, to handle systems
+ * such as Solaris which don't arrange to include <sys/ioccom.h> if you
+ * include <sys/ioctl.h>
+ */
#include <sys/ioctl.h>
+#ifdef HAVE_SYS_IOCCOM_H
+#include <sys/ioccom.h>
+#endif
#include <sys/utsname.h>
+#ifdef HAVE_ZEROCOPY_BPF
+#include <machine/atomic.h>
+#endif
+
#include <net/if.h>
#ifdef _AIX
/*
- * 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 "struct bpf_config" from it.
*/
#define PCAP_DONT_INCLUDE_PCAP_BPF_H
@@ -78,6 +99,8 @@
static int bpfloadedflag = 0;
static int odmlockid = 0;
+static int bpf_load(char *errbuf);
+
#else /* _AIX */
#include <net/bpf.h>
@@ -85,6 +108,7 @@
#endif /* _AIX */
#include <ctype.h>
+#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
@@ -92,22 +116,680 @@
#include <string.h>
#include <unistd.h>
-#include "pcap-int.h"
+#ifdef HAVE_NET_IF_MEDIA_H
+# include <net/if_media.h>
+#endif
-#ifdef HAVE_DAG_API
-#include "pcap-dag.h"
-#endif /* HAVE_DAG_API */
+#include "pcap-int.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
-#include "gencode.h" /* for "no_optimize" */
+/*
+ * Later versions of NetBSD stick padding in front of FDDI frames
+ * to align the IP header on a 4-byte boundary.
+ */
+#if defined(__NetBSD__) && __NetBSD_Version__ > 106000000
+#define PCAP_FDDIPAD 3
+#endif
+/*
+ * Private data for capturing on BPF devices.
+ */
+struct pcap_bpf {
+#ifdef PCAP_FDDIPAD
+ int fddipad;
+#endif
+
+#ifdef HAVE_ZEROCOPY_BPF
+ /*
+ * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will
+ * alternative between these two actual mmap'd buffers as required.
+ * As there is a header on the front size of the mmap'd buffer, only
+ * some of the buffer is exposed to libpcap as a whole via bufsize;
+ * zbufsize is the true size. zbuffer tracks the current zbuf
+ * assocated with buffer so that it can be used to decide which the
+ * next buffer to read will be.
+ */
+ u_char *zbuf1, *zbuf2, *zbuffer;
+ u_int zbufsize;
+ u_int zerocopy;
+ u_int interrupted;
+ struct timespec firstsel;
+ /*
+ * If there's currently a buffer being actively processed, then it is
+ * referenced here; 'buffer' is also pointed at it, but offset by the
+ * size of the header.
+ */
+ struct bpf_zbuf_header *bzh;
+ int nonblock; /* true if in nonblocking mode */
+#endif /* HAVE_ZEROCOPY_BPF */
+
+ char *device; /* device name */
+ int filtering_in_kernel; /* using kernel filter */
+ int must_do_on_close; /* stuff we must do when we close */
+};
+
+/*
+ * Stuff to do when we close.
+ */
+#define MUST_CLEAR_RFMON 0x00000001 /* clear rfmon (monitor) mode */
+
+#ifdef BIOCGDLTLIST
+# if (defined(HAVE_NET_IF_MEDIA_H) && defined(IFM_IEEE80211)) && !defined(__APPLE__)
+#define HAVE_BSD_IEEE80211
+# endif
+
+# if defined(__APPLE__) || defined(HAVE_BSD_IEEE80211)
+static int find_802_11(struct bpf_dltlist *);
+
+# ifdef HAVE_BSD_IEEE80211
+static int monitor_mode(pcap_t *, int);
+# endif
+
+# if defined(__APPLE__)
+static void remove_en(pcap_t *);
+static void remove_802_11(pcap_t *);
+# endif
+
+# endif /* defined(__APPLE__) || defined(HAVE_BSD_IEEE80211) */
+
+#endif /* BIOCGDLTLIST */
+
+#if defined(sun) && defined(LIFNAMSIZ) && defined(lifr_zoneid)
+#include <zone.h>
+#endif
+
+/*
+ * 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
+
+/*
+ * On OS X, we don't even get any of the 802.11-plus-radio-header DLT_'s
+ * defined, even though some of them are used by various Airport drivers.
+ */
+#ifndef DLT_PRISM_HEADER
+#define DLT_PRISM_HEADER 119
+#endif
+#ifndef DLT_AIRONET_HEADER
+#define DLT_AIRONET_HEADER 120
+#endif
+#ifndef DLT_IEEE802_11_RADIO
+#define DLT_IEEE802_11_RADIO 127
+#endif
+#ifndef DLT_IEEE802_11_RADIO_AVS
+#define DLT_IEEE802_11_RADIO_AVS 163
+#endif
+
+static int pcap_can_set_rfmon_bpf(pcap_t *p);
+static int pcap_activate_bpf(pcap_t *p);
static int pcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp);
static int pcap_setdirection_bpf(pcap_t *, pcap_direction_t);
static int pcap_set_datalink_bpf(pcap_t *p, int dlt);
+/*
+ * For zerocopy bpf, the setnonblock/getnonblock routines need to modify
+ * pb->nonblock so we don't call select(2) if the pcap handle is in non-
+ * blocking mode.
+ */
+static int
+pcap_getnonblock_bpf(pcap_t *p, char *errbuf)
+{
+#ifdef HAVE_ZEROCOPY_BPF
+ struct pcap_bpf *pb = p->priv;
+
+ if (pb->zerocopy)
+ return (pb->nonblock);
+#endif
+ return (pcap_getnonblock_fd(p, errbuf));
+}
+
+static int
+pcap_setnonblock_bpf(pcap_t *p, int nonblock, char *errbuf)
+{
+#ifdef HAVE_ZEROCOPY_BPF
+ struct pcap_bpf *pb = p->priv;
+
+ if (pb->zerocopy) {
+ pb->nonblock = nonblock;
+ return (0);
+ }
+#endif
+ return (pcap_setnonblock_fd(p, nonblock, errbuf));
+}
+
+#ifdef HAVE_ZEROCOPY_BPF
+/*
+ * Zero-copy BPF buffer routines to check for and acknowledge BPF data in
+ * shared memory buffers.
+ *
+ * pcap_next_zbuf_shm(): Check for a newly available shared memory buffer,
+ * and set up p->buffer and cc to reflect one if available. Notice that if
+ * there was no prior buffer, we select zbuf1 as this will be the first
+ * buffer filled for a fresh BPF session.
+ */
+static int
+pcap_next_zbuf_shm(pcap_t *p, int *cc)
+{
+ struct pcap_bpf *pb = p->priv;
+ struct bpf_zbuf_header *bzh;
+
+ if (pb->zbuffer == pb->zbuf2 || pb->zbuffer == NULL) {
+ bzh = (struct bpf_zbuf_header *)pb->zbuf1;
+ if (bzh->bzh_user_gen !=
+ atomic_load_acq_int(&bzh->bzh_kernel_gen)) {
+ pb->bzh = bzh;
+ pb->zbuffer = (u_char *)pb->zbuf1;
+ p->buffer = pb->zbuffer + sizeof(*bzh);
+ *cc = bzh->bzh_kernel_len;
+ return (1);
+ }
+ } else if (pb->zbuffer == pb->zbuf1) {
+ bzh = (struct bpf_zbuf_header *)pb->zbuf2;
+ if (bzh->bzh_user_gen !=
+ atomic_load_acq_int(&bzh->bzh_kernel_gen)) {
+ pb->bzh = bzh;
+ pb->zbuffer = (u_char *)pb->zbuf2;
+ p->buffer = pb->zbuffer + sizeof(*bzh);
+ *cc = bzh->bzh_kernel_len;
+ return (1);
+ }
+ }
+ *cc = 0;
+ return (0);
+}
+
+/*
+ * pcap_next_zbuf() -- Similar to pcap_next_zbuf_shm(), except wait using
+ * select() for data or a timeout, and possibly force rotation of the buffer
+ * in the event we time out or are in immediate mode. Invoke the shared
+ * memory check before doing system calls in order to avoid doing avoidable
+ * work.
+ */
+static int
+pcap_next_zbuf(pcap_t *p, int *cc)
+{
+ struct pcap_bpf *pb = p->priv;
+ struct bpf_zbuf bz;
+ struct timeval tv;
+ struct timespec cur;
+ fd_set r_set;
+ int data, r;
+ int expire, tmout;
+
+#define TSTOMILLI(ts) (((ts)->tv_sec * 1000) + ((ts)->tv_nsec / 1000000))
+ /*
+ * Start out by seeing whether anything is waiting by checking the
+ * next shared memory buffer for data.
+ */
+ data = pcap_next_zbuf_shm(p, cc);
+ if (data)
+ return (data);
+ /*
+ * If a previous sleep was interrupted due to signal delivery, make
+ * sure that the timeout gets adjusted accordingly. This requires
+ * that we analyze when the timeout should be been expired, and
+ * subtract the current time from that. If after this operation,
+ * our timeout is less then or equal to zero, handle it like a
+ * regular timeout.
+ */
+ tmout = p->opt.timeout;
+ if (tmout)
+ (void) clock_gettime(CLOCK_MONOTONIC, &cur);
+ if (pb->interrupted && p->opt.timeout) {
+ expire = TSTOMILLI(&pb->firstsel) + p->opt.timeout;
+ tmout = expire - TSTOMILLI(&cur);
+#undef TSTOMILLI
+ if (tmout <= 0) {
+ pb->interrupted = 0;
+ data = pcap_next_zbuf_shm(p, cc);
+ if (data)
+ return (data);
+ if (ioctl(p->fd, BIOCROTZBUF, &bz) < 0) {
+ (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCROTZBUF: %s", strerror(errno));
+ return (PCAP_ERROR);
+ }
+ return (pcap_next_zbuf_shm(p, cc));
+ }
+ }
+ /*
+ * No data in the buffer, so must use select() to wait for data or
+ * the next timeout. Note that we only call select if the handle
+ * is in blocking mode.
+ */
+ if (!pb->nonblock) {
+ FD_ZERO(&r_set);
+ FD_SET(p->fd, &r_set);
+ if (tmout != 0) {
+ tv.tv_sec = tmout / 1000;
+ tv.tv_usec = (tmout * 1000) % 1000000;
+ }
+ r = select(p->fd + 1, &r_set, NULL, NULL,
+ p->opt.timeout != 0 ? &tv : NULL);
+ if (r < 0 && errno == EINTR) {
+ if (!pb->interrupted && p->opt.timeout) {
+ pb->interrupted = 1;
+ pb->firstsel = cur;
+ }
+ return (0);
+ } else if (r < 0) {
+ (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "select: %s", strerror(errno));
+ return (PCAP_ERROR);
+ }
+ }
+ pb->interrupted = 0;
+ /*
+ * Check again for data, which may exist now that we've either been
+ * woken up as a result of data or timed out. Try the "there's data"
+ * case first since it doesn't require a system call.
+ */
+ data = pcap_next_zbuf_shm(p, cc);
+ if (data)
+ return (data);
+ /*
+ * Try forcing a buffer rotation to dislodge timed out or immediate
+ * data.
+ */
+ if (ioctl(p->fd, BIOCROTZBUF, &bz) < 0) {
+ (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCROTZBUF: %s", strerror(errno));
+ return (PCAP_ERROR);
+ }
+ return (pcap_next_zbuf_shm(p, cc));
+}
+
+/*
+ * Notify kernel that we are done with the buffer. We don't reset zbuffer so
+ * that we know which buffer to use next time around.
+ */
+static int
+pcap_ack_zbuf(pcap_t *p)
+{
+ struct pcap_bpf *pb = p->priv;
+
+ atomic_store_rel_int(&pb->bzh->bzh_user_gen,
+ pb->bzh->bzh_kernel_gen);
+ pb->bzh = NULL;
+ p->buffer = NULL;
+ return (0);
+}
+#endif /* HAVE_ZEROCOPY_BPF */
+
+pcap_t *
+pcap_create_interface(const char *device, char *ebuf)
+{
+ pcap_t *p;
+
+ p = pcap_create_common(device, ebuf, sizeof (struct pcap_bpf));
+ if (p == NULL)
+ return (NULL);
+
+ p->activate_op = pcap_activate_bpf;
+ p->can_set_rfmon_op = pcap_can_set_rfmon_bpf;
+ return (p);
+}
+
+/*
+ * On success, returns a file descriptor for a BPF device.
+ * On failure, returns a PCAP_ERROR_ value, and sets p->errbuf.
+ */
+static int
+bpf_open(pcap_t *p)
+{
+ int fd;
+#ifdef HAVE_CLONING_BPF
+ static const char device[] = "/dev/bpf";
+#else
+ int n = 0;
+ char device[sizeof "/dev/bpf0000000000"];
+#endif
+
+#ifdef _AIX
+ /*
+ * Load the bpf driver, if it isn't already loaded,
+ * and create the BPF device entries, if they don't
+ * already exist.
+ */
+ if (bpf_load(p->errbuf) == PCAP_ERROR)
+ return (PCAP_ERROR);
+#endif
+
+#ifdef HAVE_CLONING_BPF
+ if ((fd = open(device, O_RDWR)) == -1 &&
+ (errno != EACCES || (fd = open(device, O_RDONLY)) == -1)) {
+ if (errno == EACCES)
+ fd = PCAP_ERROR_PERM_DENIED;
+ else
+ fd = PCAP_ERROR;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "(cannot open device) %s: %s", device, pcap_strerror(errno));
+ }
+#else
+ /*
+ * Go through all the minors and find one that isn't in use.
+ */
+ do {
+ (void)snprintf(device, sizeof(device), "/dev/bpf%d", n++);
+ /*
+ * 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.
+ */
+ fd = open(device, O_RDWR);
+ if (fd == -1 && errno == EACCES)
+ fd = open(device, O_RDONLY);
+ } while (fd < 0 && errno == EBUSY);
+
+ /*
+ * XXX better message for all minors used
+ */
+ if (fd < 0) {
+ switch (errno) {
+
+ case ENOENT:
+ fd = PCAP_ERROR;
+ if (n == 1) {
+ /*
+ * /dev/bpf0 doesn't exist, which
+ * means we probably have no BPF
+ * devices.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "(there are no BPF devices)");
+ } else {
+ /*
+ * We got EBUSY on at least one
+ * BPF device, so we have BPF
+ * devices, but all the ones
+ * that exist are busy.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "(all BPF devices are busy)");
+ }
+ break;
+
+ case EACCES:
+ /*
+ * Got EACCES on the last device we tried,
+ * and EBUSY on all devices before that,
+ * if any.
+ */
+ fd = PCAP_ERROR_PERM_DENIED;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "(cannot open BPF device) %s: %s", device,
+ pcap_strerror(errno));
+ break;
+
+ default:
+ /*
+ * Some other problem.
+ */
+ fd = PCAP_ERROR;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "(cannot open BPF device) %s: %s", device,
+ pcap_strerror(errno));
+ break;
+ }
+ }
+#endif
+
+ return (fd);
+}
+
+#ifdef BIOCGDLTLIST
+static int
+get_dlt_list(int fd, int v, struct bpf_dltlist *bdlp, char *ebuf)
+{
+ memset(bdlp, 0, sizeof(*bdlp));
+ if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) == 0) {
+ u_int i;
+ int is_ethernet;
+
+ bdlp->bfl_list = (u_int *) malloc(sizeof(u_int) * (bdlp->bfl_len + 1));
+ if (bdlp->bfl_list == NULL) {
+ (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+ pcap_strerror(errno));
+ return (PCAP_ERROR);
+ }
+
+ if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) < 0) {
+ (void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ "BIOCGDLTLIST: %s", pcap_strerror(errno));
+ free(bdlp->bfl_list);
+ return (PCAP_ERROR);
+ }
+
+ /*
+ * OK, for real Ethernet devices, add DLT_DOCSIS to the
+ * list, 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).
+ *
+ * A "real Ethernet device" is defined here as a device
+ * that has a link-layer type of DLT_EN10MB and that has
+ * no alternate link-layer types; that's done to exclude
+ * 802.11 interfaces (which might or might not be the
+ * right thing to do, but I suspect it is - Ethernet <->
+ * 802.11 bridges would probably badly mishandle frames
+ * that don't have Ethernet headers).
+ *
+ * On Solaris with BPF, Ethernet devices also offer
+ * DLT_IPNET, so we, if DLT_IPNET is defined, we don't
+ * treat it as an indication that the device isn't an
+ * Ethernet.
+ */
+ if (v == DLT_EN10MB) {
+ is_ethernet = 1;
+ for (i = 0; i < bdlp->bfl_len; i++) {
+ if (bdlp->bfl_list[i] != DLT_EN10MB
+#ifdef DLT_IPNET
+ && bdlp->bfl_list[i] != DLT_IPNET
+#endif
+ ) {
+ is_ethernet = 0;
+ break;
+ }
+ }
+ if (is_ethernet) {
+ /*
+ * We reserved one more slot at the end of
+ * the list.
+ */
+ bdlp->bfl_list[bdlp->bfl_len] = DLT_DOCSIS;
+ bdlp->bfl_len++;
+ }
+ }
+ } else {
+ /*
+ * EINVAL just means "we don't support this ioctl on
+ * this device"; don't treat it as an error.
+ */
+ if (errno != EINVAL) {
+ (void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ "BIOCGDLTLIST: %s", pcap_strerror(errno));
+ return (PCAP_ERROR);
+ }
+ }
+ return (0);
+}
+#endif
+
+static int
+pcap_can_set_rfmon_bpf(pcap_t *p)
+{
+#if defined(__APPLE__)
+ struct utsname osinfo;
+ struct ifreq ifr;
+ int fd;
+#ifdef BIOCGDLTLIST
+ struct bpf_dltlist bdl;
+#endif
+
+ /*
+ * The joys of monitor mode on OS X.
+ *
+ * Prior to 10.4, it's not supported at all.
+ *
+ * In 10.4, if adapter enN supports monitor mode, there's a
+ * wltN adapter corresponding to it; you open it, instead of
+ * enN, to get monitor mode. You get whatever link-layer
+ * headers it supplies.
+ *
+ * In 10.5, and, we assume, later releases, if adapter enN
+ * supports monitor mode, it offers, among its selectable
+ * DLT_ values, values that let you get the 802.11 header;
+ * selecting one of those values puts the adapter into monitor
+ * mode (i.e., you can't get 802.11 headers except in monitor
+ * mode, and you can't get Ethernet headers in monitor mode).
+ */
+ if (uname(&osinfo) == -1) {
+ /*
+ * Can't get the OS version; just say "no".
+ */
+ return (0);
+ }
+ /*
+ * We assume osinfo.sysname is "Darwin", because
+ * __APPLE__ is defined. We just check the version.
+ */
+ if (osinfo.release[0] < '8' && osinfo.release[1] == '.') {
+ /*
+ * 10.3 (Darwin 7.x) or earlier.
+ * Monitor mode not supported.
+ */
+ return (0);
+ }
+ if (osinfo.release[0] == '8' && osinfo.release[1] == '.') {
+ /*
+ * 10.4 (Darwin 8.x). s/en/wlt/, and check
+ * whether the device exists.
+ */
+ if (strncmp(p->opt.source, "en", 2) != 0) {
+ /*
+ * Not an enN device; no monitor mode.
+ */
+ return (0);
+ }
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd == -1) {
+ (void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "socket: %s", pcap_strerror(errno));
+ return (PCAP_ERROR);
+ }
+ strlcpy(ifr.ifr_name, "wlt", sizeof(ifr.ifr_name));
+ strlcat(ifr.ifr_name, p->opt.source + 2, sizeof(ifr.ifr_name));
+ if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
+ /*
+ * No such device?
+ */
+ close(fd);
+ return (0);
+ }
+ close(fd);
+ return (1);
+ }
+
+#ifdef BIOCGDLTLIST
+ /*
+ * Everything else is 10.5 or later; for those,
+ * we just open the enN device, and check whether
+ * we have any 802.11 devices.
+ *
+ * First, open a BPF device.
+ */
+ fd = bpf_open(p);
+ if (fd < 0)
+ return (fd); /* fd is the appropriate error code */
+
+ /*
+ * Now bind to the device.
+ */
+ (void)strncpy(ifr.ifr_name, p->opt.source, sizeof(ifr.ifr_name));
+ if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) {
+ switch (errno) {
+
+ case ENXIO:
+ /*
+ * There's no such device.
+ */
+ close(fd);
+ return (PCAP_ERROR_NO_SUCH_DEVICE);
+
+ case ENETDOWN:
+ /*
+ * Return a "network down" indication, so that
+ * the application can report that rather than
+ * saying we had a mysterious failure and
+ * suggest that they report a problem to the
+ * libpcap developers.
+ */
+ close(fd);
+ return (PCAP_ERROR_IFACE_NOT_UP);
+
+ default:
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCSETIF: %s: %s",
+ p->opt.source, pcap_strerror(errno));
+ close(fd);
+ return (PCAP_ERROR);
+ }
+ }
+
+ /*
+ * We know the default link type -- now determine all the DLTs
+ * this interface supports. If this fails with EINVAL, it's
+ * not fatal; we just don't get to use the feature later.
+ * (We don't care about DLT_DOCSIS, so we pass DLT_NULL
+ * as the default DLT for this adapter.)
+ */
+ if (get_dlt_list(fd, DLT_NULL, &bdl, p->errbuf) == PCAP_ERROR) {
+ close(fd);
+ return (PCAP_ERROR);
+ }
+ if (find_802_11(&bdl) != -1) {
+ /*
+ * We have an 802.11 DLT, so we can set monitor mode.
+ */
+ free(bdl.bfl_list);
+ close(fd);
+ return (1);
+ }
+ free(bdl.bfl_list);
+#endif /* BIOCGDLTLIST */
+ return (0);
+#elif defined(HAVE_BSD_IEEE80211)
+ int ret;
+
+ ret = monitor_mode(p, 0);
+ if (ret == PCAP_ERROR_RFMON_NOTSUP)
+ return (0); /* not an error, just a "can't do" */
+ if (ret == 0)
+ return (1); /* success */
+ return (ret);
+#else
+ return (0);
+#endif
+}
+
static int
pcap_stats_bpf(pcap_t *p, struct pcap_stat *ps)
{
@@ -129,27 +811,30 @@
if (ioctl(p->fd, BIOCGSTATS, (caddr_t)&s) < 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGSTATS: %s",
pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
ps->ps_recv = s.bs_recv;
ps->ps_drop = s.bs_drop;
+ ps->ps_ifdrop = 0;
return (0);
}
static int
pcap_read_bpf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
+ struct pcap_bpf *pb = p->priv;
int cc;
int n = 0;
register u_char *bp, *ep;
u_char *datap;
- struct bpf_insn *fcode;
#ifdef PCAP_FDDIPAD
register int pad;
#endif
+#ifdef HAVE_ZEROCOPY_BPF
+ int i;
+#endif
- fcode = p->md.use_bpf ? NULL : p->fcode.bf_insns;
again:
/*
* Has "pcap_breakloop()" been called?
@@ -157,15 +842,36 @@
if (p->break_loop) {
/*
* Yes - clear the flag that indicates that it
- * has, and return -2 to indicate that we were
- * told to break out of the loop.
+ * has, and return PCAP_ERROR_BREAK to indicate
+ * that we were told to break out of the loop.
*/
p->break_loop = 0;
- return (-2);
+ return (PCAP_ERROR_BREAK);
}
cc = p->cc;
if (p->cc == 0) {
- cc = read(p->fd, (char *)p->buffer, p->bufsize);
+ /*
+ * When reading without zero-copy from a file descriptor, we
+ * use a single buffer and return a length of data in the
+ * buffer. With zero-copy, we update the p->buffer pointer
+ * to point at whatever underlying buffer contains the next
+ * data and update cc to reflect the data found in the
+ * buffer.
+ */
+#ifdef HAVE_ZEROCOPY_BPF
+ if (pb->zerocopy) {
+ if (p->buffer != NULL)
+ pcap_ack_zbuf(p);
+ i = pcap_next_zbuf(p, &cc);
+ if (i == 0)
+ goto again;
+ if (i < 0)
+ return (PCAP_ERROR);
+ } else
+#endif
+ {
+ cc = read(p->fd, (char *)p->buffer, p->bufsize);
+ }
if (cc < 0) {
/* Don't choke when we get ptraced */
switch (errno) {
@@ -180,16 +886,16 @@
*
* For some unknown reason the uiomove()
* operation in the bpf kernel extension
- * used to copy the buffer into user
+ * used to copy the buffer into user
* space sometimes returns EFAULT. I have
* no idea why this is the case given that
- * a kernel debugger shows the user buffer
- * is correct. This problem appears to
- * be mostly mitigated by the memset of
- * the buffer before it is first used.
+ * a kernel debugger shows the user buffer
+ * is correct. This problem appears to
+ * be mostly mitigated by the memset of
+ * the buffer before it is first used.
* Very strange.... Shaun Clowes
*
- * In any case this means that we shouldn't
+ * In any case this means that we shouldn't
* treat EFAULT as a fatal error; as we
* don't have an API for returning
* a "some packets were dropped since
@@ -197,11 +903,26 @@
* we just ignore EFAULT and keep reading.
*/
goto again;
-#endif
-
+#endif
+
case EWOULDBLOCK:
return (0);
-#if defined(sun) && !defined(BSD)
+
+ case ENXIO:
+ /*
+ * The device on which we're capturing
+ * went away.
+ *
+ * XXX - we should really return
+ * PCAP_ERROR_IFACE_NOT_UP, but
+ * pcap_dispatch() etc. aren't
+ * defined to retur that.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "The interface went down");
+ return (PCAP_ERROR);
+
+#if defined(sun) && !defined(BSD) && !defined(__svr4__) && !defined(__SVR4)
/*
* Due to a SunOS bug, after 2^31 bytes, the kernel
* file offset overflows and read fails with EINVAL.
@@ -218,7 +939,7 @@
}
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read: %s",
pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
bp = p->buffer;
} else
@@ -238,21 +959,36 @@
/*
* 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.
+ * packets, clear the flag and return PCAP_ERROR_BREAK
+ * 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) {
+ p->bp = bp;
+ p->cc = ep - bp;
+ /*
+ * ep is set based on the return value of read(),
+ * but read() from a BPF device doesn't necessarily
+ * return a value that's a multiple of the alignment
+ * value for BPF_WORDALIGN(). However, whenever we
+ * increment bp, we round up the increment value by
+ * a value rounded up by BPF_WORDALIGN(), so we
+ * could increment bp past ep after processing the
+ * last packet in the buffer.
+ *
+ * We treat ep < bp as an indication that this
+ * happened, and just set p->cc to 0.
+ */
+ if (p->cc < 0)
+ p->cc = 0;
if (n == 0) {
p->break_loop = 0;
- return (-2);
- } else {
- p->bp = bp;
- p->cc = ep - bp;
+ return (PCAP_ERROR_BREAK);
+ } else
return (n);
- }
}
caplen = bhp->bh_caplen;
@@ -260,7 +996,8 @@
datap = bp + hdrlen;
/*
* 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.
*
#ifdef PCAP_FDDIPAD
* Note: the filter code was generated assuming
@@ -270,8 +1007,8 @@
* skipping that padding.
#endif
*/
- if (fcode == NULL ||
- bpf_filter(fcode, datap, bhp->bh_datalen, caplen)) {
+ if (pb->filtering_in_kernel ||
+ bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) {
struct pcap_pkthdr pkthdr;
pkthdr.ts.tv_sec = bhp->bh_tstamp.tv_sec;
@@ -300,9 +1037,14 @@
#endif
(*callback)(user, &pkthdr, datap);
bp += BPF_WORDALIGN(caplen + hdrlen);
- if (++n >= cnt && cnt > 0) {
+ if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
p->bp = bp;
p->cc = ep - bp;
+ /*
+ * See comment above about p->cc < 0.
+ */
+ if (p->cc < 0)
+ p->cc = 0;
return (n);
}
} else {
@@ -349,7 +1091,7 @@
(void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"send: can't turn off BIOCSHDRCMPLT: %s",
pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
/*
@@ -361,13 +1103,13 @@
if (ret == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
return (ret);
}
#ifdef _AIX
-static int
+static int
bpf_odminit(char *errbuf)
{
char *errstr;
@@ -378,7 +1120,7 @@
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_initialize failed: %s",
errstr);
- return (-1);
+ return (PCAP_ERROR);
}
if ((odmlockid = odm_lock("/etc/objrepos/config_lock", ODM_WAIT)) == -1) {
@@ -387,33 +1129,38 @@
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_lock of /etc/objrepos/config_lock failed: %s",
errstr);
- return (-1);
+ (void)odm_terminate();
+ return (PCAP_ERROR);
}
return (0);
}
-static int
+static int
bpf_odmcleanup(char *errbuf)
{
char *errstr;
if (odm_unlock(odmlockid) == -1) {
- if (odm_err_msg(odmerrno, &errstr) == -1)
- errstr = "Unknown error";
- snprintf(errbuf, PCAP_ERRBUF_SIZE,
- "bpf_load: odm_unlock failed: %s",
- errstr);
- return (-1);
+ if (errbuf != NULL) {
+ if (odm_err_msg(odmerrno, &errstr) == -1)
+ errstr = "Unknown error";
+ snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "bpf_load: odm_unlock failed: %s",
+ errstr);
+ }
+ return (PCAP_ERROR);
}
if (odm_terminate() == -1) {
- if (odm_err_msg(odmerrno, &errstr) == -1)
- errstr = "Unknown error";
- snprintf(errbuf, PCAP_ERRBUF_SIZE,
- "bpf_load: odm_terminate failed: %s",
- errstr);
- return (-1);
+ if (errbuf != NULL) {
+ if (odm_err_msg(odmerrno, &errstr) == -1)
+ errstr = "Unknown error";
+ snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "bpf_load: odm_terminate failed: %s",
+ errstr);
+ }
+ return (PCAP_ERROR);
}
return (0);
@@ -438,14 +1185,15 @@
if (bpfloadedflag)
return (0);
- if (bpf_odminit(errbuf) != 0)
- return (-1);
+ if (bpf_odminit(errbuf) == PCAP_ERROR)
+ return (PCAP_ERROR);
major = genmajor(BPF_NAME);
if (major == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: genmajor failed: %s", pcap_strerror(errno));
- return (-1);
+ (void)bpf_odmcleanup(NULL);
+ return (PCAP_ERROR);
}
minors = getminor(major, &numminors, BPF_NAME);
@@ -455,19 +1203,20 @@
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: genminor failed: %s",
pcap_strerror(errno));
- return (-1);
+ (void)bpf_odmcleanup(NULL);
+ return (PCAP_ERROR);
}
}
- if (bpf_odmcleanup(errbuf))
- return (-1);
+ if (bpf_odmcleanup(errbuf) == PCAP_ERROR)
+ return (PCAP_ERROR);
rc = stat(BPF_NODE "0", &sbuf);
if (rc == -1 && errno != ENOENT) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: can't stat %s: %s",
BPF_NODE "0", pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
if (rc == -1 || getmajor(sbuf.st_rdev) != major) {
@@ -478,7 +1227,7 @@
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: can't mknod %s: %s",
buf, pcap_strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
}
}
@@ -494,7 +1243,7 @@
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: could not load driver: %s",
strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
}
@@ -502,190 +1251,570 @@
cfg_km.cmd = CFG_INIT;
cfg_km.kmid = cfg_ld.kmid;
cfg_km.mdilen = sizeof(cfg_bpf);
- cfg_km.mdiptr = (void *)&cfg_bpf;
+ cfg_km.mdiptr = (void *)&cfg_bpf;
for (i = 0; i < BPF_MINORS; i++) {
cfg_bpf.devno = domakedev(major, i);
if (sysconfig(SYS_CFGKMOD, (void *)&cfg_km, sizeof(cfg_km)) == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: could not configure driver: %s",
strerror(errno));
- return (-1);
+ return (PCAP_ERROR);
}
}
-
+
bpfloadedflag = 1;
return (0);
}
#endif
-static inline int
-bpf_open(pcap_t *p, char *errbuf)
+/*
+ * Turn off rfmon mode if necessary.
+ */
+static void
+pcap_cleanup_bpf(pcap_t *p)
{
- int fd;
-#ifdef HAVE_CLONING_BPF
- static const char device[] = "/dev/bpf";
-#else
- int n = 0;
- char device[sizeof "/dev/bpf0000000000"];
+ struct pcap_bpf *pb = p->priv;
+#ifdef HAVE_BSD_IEEE80211
+ int sock;
+ struct ifmediareq req;
+ struct ifreq ifr;
#endif
-#ifdef _AIX
- /*
- * Load the bpf driver, if it isn't already loaded,
- * and create the BPF device entries, if they don't
- * already exist.
- */
- if (bpf_load(errbuf) == -1)
- return (-1);
-#endif
-
-#ifdef HAVE_CLONING_BPF
- if ((fd = open(device, O_RDWR)) == -1 &&
- (errno != EACCES || (fd = open(device, O_RDONLY)) == -1))
- snprintf(errbuf, PCAP_ERRBUF_SIZE,
- "(cannot open device) %s: %s", device, pcap_strerror(errno));
-#else
- /*
- * Go through all the minors and find one that isn't in use.
- */
- do {
- (void)snprintf(device, sizeof(device), "/dev/bpf%d", n++);
+ if (pb->must_do_on_close != 0) {
/*
- * 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.
+ * There's something we have to do when closing this
+ * pcap_t.
*/
- fd = open(device, O_RDWR);
- if (fd == -1 && errno == EACCES)
- fd = open(device, O_RDONLY);
- } while (fd < 0 && errno == EBUSY);
+#ifdef HAVE_BSD_IEEE80211
+ if (pb->must_do_on_close & MUST_CLEAR_RFMON) {
+ /*
+ * We put the interface into rfmon mode;
+ * take it out of rfmon mode.
+ *
+ * XXX - if somebody else wants it in rfmon
+ * mode, this code cannot know that, so it'll take
+ * it out of rfmon mode.
+ */
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ fprintf(stderr,
+ "Can't restore interface flags (socket() failed: %s).\n"
+ "Please adjust manually.\n",
+ strerror(errno));
+ } else {
+ memset(&req, 0, sizeof(req));
+ strncpy(req.ifm_name, pb->device,
+ sizeof(req.ifm_name));
+ if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) {
+ fprintf(stderr,
+ "Can't restore interface flags (SIOCGIFMEDIA failed: %s).\n"
+ "Please adjust manually.\n",
+ strerror(errno));
+ } else {
+ if (req.ifm_current & IFM_IEEE80211_MONITOR) {
+ /*
+ * Rfmon mode is currently on;
+ * turn it off.
+ */
+ memset(&ifr, 0, sizeof(ifr));
+ (void)strncpy(ifr.ifr_name,
+ pb->device,
+ sizeof(ifr.ifr_name));
+ ifr.ifr_media =
+ req.ifm_current & ~IFM_IEEE80211_MONITOR;
+ if (ioctl(sock, SIOCSIFMEDIA,
+ &ifr) == -1) {
+ fprintf(stderr,
+ "Can't restore interface flags (SIOCSIFMEDIA failed: %s).\n"
+ "Please adjust manually.\n",
+ strerror(errno));
+ }
+ }
+ }
+ close(sock);
+ }
+ }
+#endif /* HAVE_BSD_IEEE80211 */
- /*
- * XXX better message for all minors used
- */
- if (fd < 0)
- snprintf(errbuf, PCAP_ERRBUF_SIZE, "(no devices found) %s: %s",
- device, pcap_strerror(errno));
+ /*
+ * Take this pcap out of the list of pcaps for which we
+ * have to take the interface out of some mode.
+ */
+ pcap_remove_from_pcaps_to_close(p);
+ pb->must_do_on_close = 0;
+ }
+
+#ifdef HAVE_ZEROCOPY_BPF
+ if (pb->zerocopy) {
+ /*
+ * Delete the mappings. Note that p->buffer gets
+ * initialized to one of the mmapped regions in
+ * this case, so do not try and free it directly;
+ * null it out so that pcap_cleanup_live_common()
+ * doesn't try to free it.
+ */
+ if (pb->zbuf1 != MAP_FAILED && pb->zbuf1 != NULL)
+ (void) munmap(pb->zbuf1, pb->zbufsize);
+ if (pb->zbuf2 != MAP_FAILED && pb->zbuf2 != NULL)
+ (void) munmap(pb->zbuf2, pb->zbufsize);
+ p->buffer = NULL;
+ }
+#endif
+ if (pb->device != NULL) {
+ free(pb->device);
+ pb->device = NULL;
+ }
+ pcap_cleanup_live_common(p);
+}
+
+static int
+check_setif_failure(pcap_t *p, int error)
+{
+#ifdef __APPLE__
+ int fd;
+ struct ifreq ifr;
+ int err;
#endif
- return (fd);
+ if (error == ENXIO) {
+ /*
+ * No such device exists.
+ */
+#ifdef __APPLE__
+ if (p->opt.rfmon && strncmp(p->opt.source, "wlt", 3) == 0) {
+ /*
+ * Monitor mode was requested, and we're trying
+ * to open a "wltN" device. Assume that this
+ * is 10.4 and that we were asked to open an
+ * "enN" device; if that device exists, return
+ * "monitor mode not supported on the device".
+ */
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd != -1) {
+ strlcpy(ifr.ifr_name, "en",
+ sizeof(ifr.ifr_name));
+ strlcat(ifr.ifr_name, p->opt.source + 3,
+ sizeof(ifr.ifr_name));
+ if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
+ /*
+ * We assume this failed because
+ * the underlying device doesn't
+ * exist.
+ */
+ err = PCAP_ERROR_NO_SUCH_DEVICE;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFFLAGS on %s failed: %s",
+ ifr.ifr_name, pcap_strerror(errno));
+ } else {
+ /*
+ * The underlying "enN" device
+ * exists, but there's no
+ * corresponding "wltN" device;
+ * that means that the "enN"
+ * device doesn't support
+ * monitor mode, probably because
+ * it's an Ethernet device rather
+ * than a wireless device.
+ */
+ err = PCAP_ERROR_RFMON_NOTSUP;
+ }
+ close(fd);
+ } else {
+ /*
+ * We can't find out whether there's
+ * an underlying "enN" device, so
+ * just report "no such device".
+ */
+ err = PCAP_ERROR_NO_SUCH_DEVICE;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "socket() failed: %s",
+ pcap_strerror(errno));
+ }
+ return (err);
+ }
+#endif
+ /*
+ * No such device.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF failed: %s",
+ pcap_strerror(errno));
+ return (PCAP_ERROR_NO_SUCH_DEVICE);
+ } else if (errno == ENETDOWN) {
+ /*
+ * Return a "network down" indication, so that
+ * the application can report that rather than
+ * saying we had a mysterious failure and
+ * suggest that they report a problem to the
+ * libpcap developers.
+ */
+ return (PCAP_ERROR_IFACE_NOT_UP);
+ } else {
+ /*
+ * Some other error; fill in the error string, and
+ * return PCAP_ERROR.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s",
+ p->opt.source, pcap_strerror(errno));
+ return (PCAP_ERROR);
+ }
}
/*
- * We include the OS's <net/bpf.h>, not our "pcap-bpf.h", so we probably
- * don't get DLT_DOCSIS defined.
+ * Default capture buffer size.
+ * 32K isn't very much for modern machines with fast networks; we
+ * pick .5M, as that's the maximum on at least some systems with BPF.
+ *
+ * However, on AIX 3.5, the larger buffer sized caused unrecoverable
+ * read failures under stress, so we leave it as 32K; yet another
+ * place where AIX's BPF is broken.
*/
-#ifndef DLT_DOCSIS
-#define DLT_DOCSIS 143
+#ifdef _AIX
+#define DEFAULT_BUFSIZE 32768
+#else
+#define DEFAULT_BUFSIZE 524288
#endif
-pcap_t *
-pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
- char *ebuf)
+static int
+pcap_activate_bpf(pcap_t *p)
{
+ struct pcap_bpf *pb = p->priv;
+ int status = 0;
int fd;
+#ifdef LIFNAMSIZ
+ char *zonesep;
+ struct lifreq ifr;
+ char *ifrname = ifr.lifr_name;
+ const size_t ifnamsiz = sizeof(ifr.lifr_name);
+#else
struct ifreq ifr;
+ char *ifrname = ifr.ifr_name;
+ const size_t ifnamsiz = sizeof(ifr.ifr_name);
+#endif
struct bpf_version bv;
+#ifdef __APPLE__
+ int sockfd;
+ char *wltdev = NULL;
+#endif
#ifdef BIOCGDLTLIST
struct bpf_dltlist bdl;
+#if defined(__APPLE__) || defined(HAVE_BSD_IEEE80211)
+ int new_dlt;
#endif
+#endif /* BIOCGDLTLIST */
#if defined(BIOCGHDRCMPLT) && defined(BIOCSHDRCMPLT)
u_int spoof_eth_src = 1;
#endif
u_int v;
- pcap_t *p;
struct bpf_insn total_insn;
struct bpf_program total_prog;
struct utsname osinfo;
-
-#ifdef HAVE_DAG_API
- if (strstr(device, "dag")) {
- return dag_open_live(device, snaplen, promisc, to_ms, ebuf);
- }
-#endif /* HAVE_DAG_API */
-
-#ifdef BIOCGDLTLIST
- memset(&bdl, 0, sizeof(bdl));
+ int have_osinfo = 0;
+#ifdef HAVE_ZEROCOPY_BPF
+ struct bpf_zbuf bz;
+ u_int bufmode, zbufmax;
#endif
- p = (pcap_t *)malloc(sizeof(*p));
- if (p == NULL) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
- pcap_strerror(errno));
- return (NULL);
- }
- memset(p, 0, sizeof(*p));
- fd = bpf_open(p, ebuf);
- if (fd < 0)
+ fd = bpf_open(p);
+ if (fd < 0) {
+ status = fd;
goto bad;
+ }
p->fd = fd;
- p->snapshot = snaplen;
if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCVERSION: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCVERSION: %s",
pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
if (bv.bv_major != BPF_MAJOR_VERSION ||
bv.bv_minor < BPF_MINOR_VERSION) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"kernel bpf filter out of date");
+ status = PCAP_ERROR;
+ goto bad;
+ }
+
+#if defined(LIFNAMSIZ) && defined(ZONENAME_MAX) && defined(lifr_zoneid)
+ /*
+ * Check if the given source network device has a '/' separated
+ * zonename prefix string. The zonename prefixed source device
+ * can be used by libpcap consumers to capture network traffic
+ * in non-global zones from the global zone on Solaris 11 and
+ * above. If the zonename prefix is present then we strip the
+ * prefix and pass the zone ID as part of lifr_zoneid.
+ */
+ if ((zonesep = strchr(p->opt.source, '/')) != NULL) {
+ char zonename[ZONENAME_MAX];
+ int znamelen;
+ char *lnamep;
+
+ znamelen = zonesep - p->opt.source;
+ (void) strlcpy(zonename, p->opt.source, znamelen + 1);
+ lnamep = strdup(zonesep + 1);
+ ifr.lifr_zoneid = getzoneidbyname(zonename);
+ free(p->opt.source);
+ p->opt.source = lnamep;
+ }
+#endif
+
+ pb->device = strdup(p->opt.source);
+ if (pb->device == NULL) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "strdup: %s",
+ pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
/*
- * Try finding a good size for the buffer; 32768 may be too
- * big, so keep cutting it in half until we find a size
- * that works, or run out of sizes to try. If the default
- * is larger, don't make it smaller.
- *
- * XXX - there should be a user-accessible hook to set the
- * initial buffer size.
+ * Attempt to find out the version of the OS on which we're running.
*/
- if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) || v < 32768)
- v = 32768;
- for ( ; v != 0; v >>= 1) {
- /* Ignore the return value - this is because the call fails
- * on BPF systems that don't have kernel malloc. And if
- * the call fails, it's no big deal, we just continue to
- * use the standard buffer size.
- */
- (void) ioctl(fd, BIOCSBLEN, (caddr_t)&v);
+ if (uname(&osinfo) == 0)
+ have_osinfo = 1;
- (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
- if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) >= 0)
- break; /* that size worked; we're done */
-
- if (errno != ENOBUFS) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s",
- device, pcap_strerror(errno));
- goto bad;
+#ifdef __APPLE__
+ /*
+ * See comment in pcap_can_set_rfmon_bpf() for an explanation
+ * of why we check the version number.
+ */
+ if (p->opt.rfmon) {
+ if (have_osinfo) {
+ /*
+ * We assume osinfo.sysname is "Darwin", because
+ * __APPLE__ is defined. We just check the version.
+ */
+ if (osinfo.release[0] < '8' &&
+ osinfo.release[1] == '.') {
+ /*
+ * 10.3 (Darwin 7.x) or earlier.
+ */
+ status = PCAP_ERROR_RFMON_NOTSUP;
+ goto bad;
+ }
+ if (osinfo.release[0] == '8' &&
+ osinfo.release[1] == '.') {
+ /*
+ * 10.4 (Darwin 8.x). s/en/wlt/
+ */
+ if (strncmp(p->opt.source, "en", 2) != 0) {
+ /*
+ * Not an enN device; check
+ * whether the device even exists.
+ */
+ sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sockfd != -1) {
+ strlcpy(ifrname,
+ p->opt.source, ifnamsiz);
+ if (ioctl(sockfd, SIOCGIFFLAGS,
+ (char *)&ifr) < 0) {
+ /*
+ * We assume this
+ * failed because
+ * the underlying
+ * device doesn't
+ * exist.
+ */
+ status = PCAP_ERROR_NO_SUCH_DEVICE;
+ snprintf(p->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "SIOCGIFFLAGS failed: %s",
+ pcap_strerror(errno));
+ } else
+ status = PCAP_ERROR_RFMON_NOTSUP;
+ close(sockfd);
+ } else {
+ /*
+ * We can't find out whether
+ * the device exists, so just
+ * report "no such device".
+ */
+ status = PCAP_ERROR_NO_SUCH_DEVICE;
+ snprintf(p->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "socket() failed: %s",
+ pcap_strerror(errno));
+ }
+ goto bad;
+ }
+ wltdev = malloc(strlen(p->opt.source) + 2);
+ if (wltdev == NULL) {
+ (void)snprintf(p->errbuf,
+ PCAP_ERRBUF_SIZE, "malloc: %s",
+ pcap_strerror(errno));
+ status = PCAP_ERROR;
+ goto bad;
+ }
+ strcpy(wltdev, "wlt");
+ strcat(wltdev, p->opt.source + 2);
+ free(p->opt.source);
+ p->opt.source = wltdev;
+ }
+ /*
+ * Everything else is 10.5 or later; for those,
+ * we just open the enN device, and set the DLT.
+ */
}
}
+#endif /* __APPLE__ */
+#ifdef HAVE_ZEROCOPY_BPF
+ /*
+ * If the BPF extension to set buffer mode is present, try setting
+ * the mode to zero-copy. If that fails, use regular buffering. If
+ * it succeeds but other setup fails, return an error to the user.
+ */
+ bufmode = BPF_BUFMODE_ZBUF;
+ if (ioctl(fd, BIOCSETBUFMODE, (caddr_t)&bufmode) == 0) {
+ /*
+ * We have zerocopy BPF; use it.
+ */
+ pb->zerocopy = 1;
- if (v == 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,
- "BIOCSBLEN: %s: No buffer size worked", device);
- goto bad;
+ /*
+ * How to pick a buffer size: first, query the maximum buffer
+ * size supported by zero-copy. This also lets us quickly
+ * determine whether the kernel generally supports zero-copy.
+ * Then, if a buffer size was specified, use that, otherwise
+ * query the default buffer size, which reflects kernel
+ * policy for a desired default. Round to the nearest page
+ * size.
+ */
+ if (ioctl(fd, BIOCGETZMAX, (caddr_t)&zbufmax) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGETZMAX: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+
+ if (p->opt.buffer_size != 0) {
+ /*
+ * A buffer size was explicitly specified; use it.
+ */
+ v = p->opt.buffer_size;
+ } else {
+ if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) ||
+ v < DEFAULT_BUFSIZE)
+ v = DEFAULT_BUFSIZE;
+ }
+#ifndef roundup
+#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
+#endif
+ pb->zbufsize = roundup(v, getpagesize());
+ if (pb->zbufsize > zbufmax)
+ pb->zbufsize = zbufmax;
+ pb->zbuf1 = mmap(NULL, pb->zbufsize, PROT_READ | PROT_WRITE,
+ MAP_ANON, -1, 0);
+ pb->zbuf2 = mmap(NULL, pb->zbufsize, PROT_READ | PROT_WRITE,
+ MAP_ANON, -1, 0);
+ if (pb->zbuf1 == MAP_FAILED || pb->zbuf2 == MAP_FAILED) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "mmap: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ memset(&bz, 0, sizeof(bz)); /* bzero() deprecated, replaced with memset() */
+ bz.bz_bufa = pb->zbuf1;
+ bz.bz_bufb = pb->zbuf2;
+ bz.bz_buflen = pb->zbufsize;
+ if (ioctl(fd, BIOCSETZBUF, (caddr_t)&bz) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETZBUF: %s",
+ pcap_strerror(errno));
+ goto bad;
+ }
+ (void)strncpy(ifrname, p->opt.source, ifnamsiz);
+ if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s",
+ p->opt.source, pcap_strerror(errno));
+ goto bad;
+ }
+ v = pb->zbufsize - sizeof(struct bpf_zbuf_header);
+ } else
+#endif
+ {
+ /*
+ * We don't have zerocopy BPF.
+ * Set the buffer size.
+ */
+ if (p->opt.buffer_size != 0) {
+ /*
+ * A buffer size was explicitly specified; use it.
+ */
+ if (ioctl(fd, BIOCSBLEN,
+ (caddr_t)&p->opt.buffer_size) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCSBLEN: %s: %s", p->opt.source,
+ pcap_strerror(errno));
+ status = PCAP_ERROR;
+ goto bad;
+ }
+
+ /*
+ * Now bind to the device.
+ */
+ (void)strncpy(ifrname, p->opt.source, ifnamsiz);
+#ifdef BIOCSETLIF
+ if (ioctl(fd, BIOCSETLIF, (caddr_t)&ifr) < 0)
+#else
+ if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0)
+#endif
+ {
+ status = check_setif_failure(p, errno);
+ goto bad;
+ }
+ } else {
+ /*
+ * No buffer size was explicitly specified.
+ *
+ * Try finding a good size for the buffer;
+ * DEFAULT_BUFSIZE may be too big, so keep
+ * cutting it in half until we find a size
+ * that works, or run out of sizes to try.
+ * If the default is larger, don't make it smaller.
+ */
+ if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) ||
+ v < DEFAULT_BUFSIZE)
+ v = DEFAULT_BUFSIZE;
+ for ( ; v != 0; v >>= 1) {
+ /*
+ * Ignore the return value - this is because the
+ * call fails on BPF systems that don't have
+ * kernel malloc. And if the call fails, it's
+ * no big deal, we just continue to use the
+ * standard buffer size.
+ */
+ (void) ioctl(fd, BIOCSBLEN, (caddr_t)&v);
+
+ (void)strncpy(ifrname, p->opt.source, ifnamsiz);
+#ifdef BIOCSETLIF
+ if (ioctl(fd, BIOCSETLIF, (caddr_t)&ifr) >= 0)
+#else
+ if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) >= 0)
+#endif
+ break; /* that size worked; we're done */
+
+ if (errno != ENOBUFS) {
+ status = check_setif_failure(p, errno);
+ goto bad;
+ }
+ }
+
+ if (v == 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCSBLEN: %s: No buffer size worked",
+ p->opt.source);
+ status = PCAP_ERROR;
+ goto bad;
+ }
+ }
}
/* Get the data link layer type. */
if (ioctl(fd, BIOCGDLT, (caddr_t)&v) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCGDLT: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGDLT: %s",
pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
+
#ifdef _AIX
/*
* AIX's BPF returns IFF_ types, not DLT_ types, in BIOCGDLT.
@@ -713,8 +1842,9 @@
/*
* We don't know what to map this to yet.
*/
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown interface type %u",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "unknown interface type %u",
v);
+ status = PCAP_ERROR;
goto bad;
}
#endif
@@ -739,13 +1869,6 @@
break;
}
#endif
-#ifdef PCAP_FDDIPAD
- if (v == DLT_FDDI)
- p->fddipad = PCAP_FDDIPAD;
- else
- p->fddipad = 0;
-#endif
- p->linktype = v;
#ifdef BIOCGDLTLIST
/*
@@ -753,68 +1876,144 @@
* this interface supports. If this fails with EINVAL, it's
* not fatal; we just don't get to use the feature later.
*/
- if (ioctl(fd, BIOCGDLTLIST, (caddr_t)&bdl) == 0) {
- u_int i;
- int is_ethernet;
+ if (get_dlt_list(fd, v, &bdl, p->errbuf) == -1) {
+ status = PCAP_ERROR;
+ goto bad;
+ }
+ p->dlt_count = bdl.bfl_len;
+ p->dlt_list = bdl.bfl_list;
- bdl.bfl_list = (u_int *) malloc(sizeof(u_int) * (bdl.bfl_len + 1));
- if (bdl.bfl_list == NULL) {
- (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
- pcap_strerror(errno));
- goto bad;
+#ifdef __APPLE__
+ /*
+ * Monitor mode fun, continued.
+ *
+ * For 10.5 and, we're assuming, later releases, as noted above,
+ * 802.1 adapters that support monitor mode offer both DLT_EN10MB,
+ * DLT_IEEE802_11, and possibly some 802.11-plus-radio-information
+ * DLT_ value. Choosing one of the 802.11 DLT_ values will turn
+ * monitor mode on.
+ *
+ * Therefore, if the user asked for monitor mode, we filter out
+ * the DLT_EN10MB value, as you can't get that in monitor mode,
+ * and, if the user didn't ask for monitor mode, we filter out
+ * the 802.11 DLT_ values, because selecting those will turn
+ * monitor mode on. Then, for monitor mode, if an 802.11-plus-
+ * radio DLT_ value is offered, we try to select that, otherwise
+ * we try to select DLT_IEEE802_11.
+ */
+ if (have_osinfo) {
+ if (isdigit((unsigned)osinfo.release[0]) &&
+ (osinfo.release[0] == '9' ||
+ isdigit((unsigned)osinfo.release[1]))) {
+ /*
+ * 10.5 (Darwin 9.x), or later.
+ */
+ new_dlt = find_802_11(&bdl);
+ if (new_dlt != -1) {
+ /*
+ * We have at least one 802.11 DLT_ value,
+ * so this is an 802.11 interface.
+ * new_dlt is the best of the 802.11
+ * DLT_ values in the list.
+ */
+ if (p->opt.rfmon) {
+ /*
+ * Our caller wants monitor mode.
+ * Purge DLT_EN10MB from the list
+ * of link-layer types, as selecting
+ * it will keep monitor mode off.
+ */
+ remove_en(p);
+
+ /*
+ * If the new mode we want isn't
+ * the default mode, attempt to
+ * select the new mode.
+ */
+ if (new_dlt != v) {
+ if (ioctl(p->fd, BIOCSDLT,
+ &new_dlt) != -1) {
+ /*
+ * We succeeded;
+ * make this the
+ * new DLT_ value.
+ */
+ v = new_dlt;
+ }
+ }
+ } else {
+ /*
+ * Our caller doesn't want
+ * monitor mode. Unless this
+ * is being done by pcap_open_live(),
+ * purge the 802.11 link-layer types
+ * from the list, as selecting
+ * one of them will turn monitor
+ * mode on.
+ */
+ if (!p->oldstyle)
+ remove_802_11(p);
+ }
+ } else {
+ if (p->opt.rfmon) {
+ /*
+ * The caller requested monitor
+ * mode, but we have no 802.11
+ * link-layer types, so they
+ * can't have it.
+ */
+ status = PCAP_ERROR_RFMON_NOTSUP;
+ goto bad;
+ }
+ }
}
-
- if (ioctl(fd, BIOCGDLTLIST, (caddr_t)&bdl) < 0) {
- (void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
- "BIOCGDLTLIST: %s", pcap_strerror(errno));
- free(bdl.bfl_list);
+ }
+#elif defined(HAVE_BSD_IEEE80211)
+ /*
+ * *BSD with the new 802.11 ioctls.
+ * Do we want monitor mode?
+ */
+ if (p->opt.rfmon) {
+ /*
+ * Try to put the interface into monitor mode.
+ */
+ status = monitor_mode(p, 1);
+ if (status != 0) {
+ /*
+ * We failed.
+ */
goto bad;
}
/*
- * OK, for real Ethernet devices, add DLT_DOCSIS to the
- * list, 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).
- *
- * A "real Ethernet device" is defined here as a device
- * that has a link-layer type of DLT_EN10MB and that has
- * no alternate link-layer types; that's done to exclude
- * 802.11 interfaces (which might or might not be the
- * right thing to do, but I suspect it is - Ethernet <->
- * 802.11 bridges would probably badly mishandle frames
- * that don't have Ethernet headers).
+ * We're in monitor mode.
+ * Try to find the best 802.11 DLT_ value and, if we
+ * succeed, try to switch to that mode if we're not
+ * already in that mode.
*/
- if (p->linktype == DLT_EN10MB) {
- is_ethernet = 1;
- for (i = 0; i < bdl.bfl_len; i++) {
- if (bdl.bfl_list[i] != DLT_EN10MB) {
- is_ethernet = 0;
- break;
+ new_dlt = find_802_11(&bdl);
+ if (new_dlt != -1) {
+ /*
+ * We have at least one 802.11 DLT_ value.
+ * new_dlt is the best of the 802.11
+ * DLT_ values in the list.
+ *
+ * If the new mode we want isn't the default mode,
+ * attempt to select the new mode.
+ */
+ if (new_dlt != v) {
+ if (ioctl(p->fd, BIOCSDLT, &new_dlt) != -1) {
+ /*
+ * We succeeded; make this the
+ * new DLT_ value.
+ */
+ v = new_dlt;
}
}
- if (is_ethernet) {
- /*
- * We reserved one more slot at the end of
- * the list.
- */
- bdl.bfl_list[bdl.bfl_len] = DLT_DOCSIS;
- bdl.bfl_len++;
- }
- }
- p->dlt_count = bdl.bfl_len;
- p->dlt_list = bdl.bfl_list;
- } else {
- if (errno != EINVAL) {
- (void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
- "BIOCGDLTLIST: %s", pcap_strerror(errno));
- goto bad;
}
}
-#endif
+#endif /* various platforms */
+#endif /* BIOCGDLTLIST */
/*
* If this is an Ethernet device, and we don't have a DLT_ list,
@@ -824,7 +2023,7 @@
* some other way of determining whether it's an Ethernet or 802.11
* device.)
*/
- if (p->linktype == DLT_EN10MB && p->dlt_count == 0) {
+ if (v == DLT_EN10MB && p->dlt_count == 0) {
p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
/*
* If that fails, just leave the list empty.
@@ -835,7 +2034,14 @@
p->dlt_count = 2;
}
}
-
+#ifdef PCAP_FDDIPAD
+ if (v == DLT_FDDI)
+ p->fddipad = PCAP_FDDIPAD;
+ else
+#endif
+ p->fddipad = 0;
+ p->linktype = v;
+
#if defined(BIOCGHDRCMPLT) && defined(BIOCSHDRCMPLT)
/*
* Do a BIOCSHDRCMPLT, if defined, to turn that flag on, so
@@ -847,29 +2053,68 @@
* BSDs - check CVS log for "bpf.c"?
*/
if (ioctl(fd, BIOCSHDRCMPLT, &spoof_eth_src) == -1) {
- (void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ (void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"BIOCSHDRCMPLT: %s", pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
#endif
/* set timeout */
- if (to_ms != 0) {
+#ifdef HAVE_ZEROCOPY_BPF
+ /*
+ * In zero-copy mode, we just use the timeout in select().
+ * XXX - what if we're in non-blocking mode and the *application*
+ * is using select() or poll() or kqueues or....?
+ */
+ if (p->opt.timeout && !pb->zerocopy) {
+#else
+ if (p->opt.timeout) {
+#endif
/*
* XXX - is this seconds/nanoseconds in AIX?
* (Treating it as such doesn't fix the timeout
* problem described below.)
+ *
+ * XXX - Mac OS X 10.6 mishandles BIOCSRTIMEOUT in
+ * 64-bit userland - it takes, as an argument, a
+ * "struct BPF_TIMEVAL", which has 32-bit tv_sec
+ * and tv_usec, rather than a "struct timeval".
+ *
+ * If this platform defines "struct BPF_TIMEVAL",
+ * we check whether the structure size in BIOCSRTIMEOUT
+ * is that of a "struct timeval" and, if not, we use
+ * a "struct BPF_TIMEVAL" rather than a "struct timeval".
+ * (That way, if the bug is fixed in a future release,
+ * we will still do the right thing.)
*/
struct timeval to;
- to.tv_sec = to_ms / 1000;
- to.tv_usec = (to_ms * 1000) % 1000000;
- if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&to) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCSRTIMEOUT: %s",
- pcap_strerror(errno));
- goto bad;
+#ifdef HAVE_STRUCT_BPF_TIMEVAL
+ struct BPF_TIMEVAL bpf_to;
+
+ if (IOCPARM_LEN(BIOCSRTIMEOUT) != sizeof(struct timeval)) {
+ bpf_to.tv_sec = p->opt.timeout / 1000;
+ bpf_to.tv_usec = (p->opt.timeout * 1000) % 1000000;
+ if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&bpf_to) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCSRTIMEOUT: %s", pcap_strerror(errno));
+ status = PCAP_ERROR;
+ goto bad;
+ }
+ } else {
+#endif
+ to.tv_sec = p->opt.timeout / 1000;
+ to.tv_usec = (p->opt.timeout * 1000) % 1000000;
+ if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&to) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCSRTIMEOUT: %s", pcap_strerror(errno));
+ status = PCAP_ERROR;
+ goto bad;
+ }
+#ifdef HAVE_STRUCT_BPF_TIMEVAL
}
+#endif
}
-#ifdef _AIX
#ifdef BIOCIMMEDIATE
/*
* Darren Reed notes that
@@ -881,76 +2126,73 @@
* is reducing things to only a few packets (i.e. one every
* second or so).
*
- * so we turn BIOCIMMEDIATE mode on if this is AIX.
+ * so we always turn BIOCIMMEDIATE mode on if this is AIX.
*
- * We don't turn it on for other platforms, as that means we
- * get woken up for every packet, which may not be what we want;
- * in the Winter 1993 USENIX paper on BPF, they say:
+ * For other platforms, we don't turn immediate mode on by default,
+ * as that would mean we get woken up for every packet, which
+ * probably isn't what you want for a packet sniffer.
*
- * Since a process might want to look at every packet on a
- * network and the time between packets can be only a few
- * microseconds, it is not possible to do a read system call
- * per packet and BPF must collect the data from several
- * packets and return it as a unit when the monitoring
- * application does a read.
- *
- * which I infer is the reason for the timeout - it means we
- * wait that amount of time, in the hopes that more packets
- * will arrive and we'll get them all with one read.
- *
- * Setting BIOCIMMEDIATE mode on FreeBSD (and probably other
- * BSDs) causes the timeout to be ignored.
- *
- * On the other hand, some platforms (e.g., Linux) don't support
- * timeouts, they just hand stuff to you as soon as it arrives;
- * if that doesn't cause a problem on those platforms, it may
- * be OK to have BIOCIMMEDIATE mode on BSD as well.
- *
- * (Note, though, that applications may depend on the read
- * completing, even if no packets have arrived, when the timeout
- * expires, e.g. GUI applications that have to check for input
- * while waiting for packets to arrive; a non-zero timeout
- * prevents "select()" from working right on FreeBSD and
- * possibly other BSDs, as the timer doesn't start until a
- * "read()" is done, so the timer isn't in effect if the
- * application is blocked on a "select()", and the "select()"
- * doesn't get woken up for a BPF device until the buffer
- * fills up.)
+ * We set immediate mode if the caller requested it by calling
+ * pcap_set_immediate() before calling pcap_activate().
*/
- v = 1;
- if (ioctl(p->fd, BIOCIMMEDIATE, &v) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCIMMEDIATE: %s",
- pcap_strerror(errno));
+#ifndef _AIX
+ if (p->opt.immediate) {
+#endif /* _AIX */
+ v = 1;
+ if (ioctl(p->fd, BIOCIMMEDIATE, &v) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BIOCIMMEDIATE: %s", pcap_strerror(errno));
+ status = PCAP_ERROR;
+ goto bad;
+ }
+#ifndef _AIX
+ }
+#endif /* _AIX */
+#else /* BIOCIMMEDIATE */
+ if (p->opt.immediate) {
+ /*
+ * We don't support immediate mode. Fail.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Immediate mode not supported");
+ status = PCAP_ERROR;
goto bad;
}
-#endif /* BIOCIMMEDIATE */
-#endif /* _AIX */
+#endif /* BIOCIMMEDIATE */
- if (promisc) {
- /* set promiscuous mode, okay if it fails */
+ if (p->opt.promisc) {
+ /* set promiscuous mode, just warn if it fails */
if (ioctl(p->fd, BIOCPROMISC, NULL) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCPROMISC: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCPROMISC: %s",
pcap_strerror(errno));
+ status = PCAP_WARNING_PROMISC_NOTSUP;
}
}
if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCGBLEN: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGBLEN: %s",
pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
p->bufsize = v;
+#ifdef HAVE_ZEROCOPY_BPF
+ if (!pb->zerocopy) {
+#endif
p->buffer = (u_char *)malloc(p->bufsize);
if (p->buffer == NULL) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s",
pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
#ifdef _AIX
- /* For some strange reason this seems to prevent the EFAULT
+ /* For some strange reason this seems to prevent the EFAULT
* problems we have experienced from AIX BPF. */
memset(p->buffer, 0x0, p->bufsize);
#endif
+#ifdef HAVE_ZEROCOPY_BPF
+ }
+#endif
/*
* If there's no filter program installed, there's
@@ -964,13 +2206,14 @@
total_insn.code = (u_short)(BPF_RET | BPF_K);
total_insn.jt = 0;
total_insn.jf = 0;
- total_insn.k = snaplen;
+ total_insn.k = p->snapshot;
total_prog.bf_len = 1;
total_prog.bf_insns = &total_insn;
if (ioctl(p->fd, BIOCSETF, (caddr_t)&total_prog) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s",
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s",
pcap_strerror(errno));
+ status = PCAP_ERROR;
goto bad;
}
@@ -1011,7 +2254,7 @@
* XXX - what about AIX?
*/
p->selectable_fd = p->fd; /* assume select() works until we know otherwise */
- if (uname(&osinfo) == 0) {
+ if (have_osinfo) {
/*
* We can check what OS this is.
*/
@@ -1027,48 +2270,343 @@
p->setfilter_op = pcap_setfilter_bpf;
p->setdirection_op = pcap_setdirection_bpf;
p->set_datalink_op = pcap_set_datalink_bpf;
- p->getnonblock_op = pcap_getnonblock_fd;
- p->setnonblock_op = pcap_setnonblock_fd;
+ p->getnonblock_op = pcap_getnonblock_bpf;
+ p->setnonblock_op = pcap_setnonblock_bpf;
p->stats_op = pcap_stats_bpf;
- p->close_op = pcap_close_common;
+ p->cleanup_op = pcap_cleanup_bpf;
- return (p);
+ return (status);
bad:
- (void)close(fd);
- if (p->dlt_list != NULL)
- free(p->dlt_list);
- free(p);
- return (NULL);
+ pcap_cleanup_bpf(p);
+ return (status);
}
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
-#ifdef HAVE_DAG_API
- if (dag_platform_finddevs(alldevsp, errbuf) < 0)
- return (-1);
-#endif /* HAVE_DAG_API */
-
return (0);
}
+#ifdef HAVE_BSD_IEEE80211
+static int
+monitor_mode(pcap_t *p, int set)
+{
+ struct pcap_bpf *pb = p->priv;
+ int sock;
+ struct ifmediareq req;
+ int *media_list;
+ int i;
+ int can_do;
+ struct ifreq ifr;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't open socket: %s",
+ pcap_strerror(errno));
+ return (PCAP_ERROR);
+ }
+
+ memset(&req, 0, sizeof req);
+ strncpy(req.ifm_name, p->opt.source, sizeof req.ifm_name);
+
+ /*
+ * Find out how many media types we have.
+ */
+ if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) {
+ /*
+ * Can't get the media types.
+ */
+ switch (errno) {
+
+ case ENXIO:
+ /*
+ * There's no such device.
+ */
+ close(sock);
+ return (PCAP_ERROR_NO_SUCH_DEVICE);
+
+ case EINVAL:
+ /*
+ * Interface doesn't support SIOC{G,S}IFMEDIA.
+ */
+ close(sock);
+ return (PCAP_ERROR_RFMON_NOTSUP);
+
+ default:
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFMEDIA 1: %s", pcap_strerror(errno));
+ close(sock);
+ return (PCAP_ERROR);
+ }
+ }
+ if (req.ifm_count == 0) {
+ /*
+ * No media types.
+ */
+ close(sock);
+ return (PCAP_ERROR_RFMON_NOTSUP);
+ }
+
+ /*
+ * Allocate a buffer to hold all the media types, and
+ * get the media types.
+ */
+ media_list = malloc(req.ifm_count * sizeof(int));
+ if (media_list == NULL) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+ pcap_strerror(errno));
+ close(sock);
+ return (PCAP_ERROR);
+ }
+ req.ifm_ulist = media_list;
+ if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "SIOCGIFMEDIA: %s",
+ pcap_strerror(errno));
+ free(media_list);
+ close(sock);
+ return (PCAP_ERROR);
+ }
+
+ /*
+ * Look for an 802.11 "automatic" media type.
+ * We assume that all 802.11 adapters have that media type,
+ * and that it will carry the monitor mode supported flag.
+ */
+ can_do = 0;
+ for (i = 0; i < req.ifm_count; i++) {
+ if (IFM_TYPE(media_list[i]) == IFM_IEEE80211
+ && IFM_SUBTYPE(media_list[i]) == IFM_AUTO) {
+ /* OK, does it do monitor mode? */
+ if (media_list[i] & IFM_IEEE80211_MONITOR) {
+ can_do = 1;
+ break;
+ }
+ }
+ }
+ free(media_list);
+ if (!can_do) {
+ /*
+ * This adapter doesn't support monitor mode.
+ */
+ close(sock);
+ return (PCAP_ERROR_RFMON_NOTSUP);
+ }
+
+ if (set) {
+ /*
+ * Don't just check whether we can enable monitor mode,
+ * do so, if it's not already enabled.
+ */
+ if ((req.ifm_current & IFM_IEEE80211_MONITOR) == 0) {
+ /*
+ * Monitor mode isn't currently on, so turn it on,
+ * and remember that we should turn it off when the
+ * pcap_t is closed.
+ */
+
+ /*
+ * If we haven't already done so, arrange to have
+ * "pcap_close_all()" called when we exit.
+ */
+ if (!pcap_do_addexit(p)) {
+ /*
+ * "atexit()" failed; don't put the interface
+ * in monitor mode, just give up.
+ */
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "atexit failed");
+ close(sock);
+ return (PCAP_ERROR);
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ (void)strncpy(ifr.ifr_name, p->opt.source,
+ sizeof(ifr.ifr_name));
+ ifr.ifr_media = req.ifm_current | IFM_IEEE80211_MONITOR;
+ if (ioctl(sock, SIOCSIFMEDIA, &ifr) == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCSIFMEDIA: %s", pcap_strerror(errno));
+ close(sock);
+ return (PCAP_ERROR);
+ }
+
+ pb->must_do_on_close |= MUST_CLEAR_RFMON;
+
+ /*
+ * Add this to the list of pcaps to close when we exit.
+ */
+ pcap_add_to_pcaps_to_close(p);
+ }
+ }
+ return (0);
+}
+#endif /* HAVE_BSD_IEEE80211 */
+
+#if defined(BIOCGDLTLIST) && (defined(__APPLE__) || defined(HAVE_BSD_IEEE80211))
+/*
+ * Check whether we have any 802.11 link-layer types; return the best
+ * of the 802.11 link-layer types if we find one, and return -1
+ * otherwise.
+ *
+ * DLT_IEEE802_11_RADIO, with the radiotap header, is considered the
+ * best 802.11 link-layer type; any of the other 802.11-plus-radio
+ * headers are second-best; 802.11 with no radio information is
+ * the least good.
+ */
+static int
+find_802_11(struct bpf_dltlist *bdlp)
+{
+ int new_dlt;
+ int i;
+
+ /*
+ * Scan the list of DLT_ values, looking for 802.11 values,
+ * and, if we find any, choose the best of them.
+ */
+ new_dlt = -1;
+ for (i = 0; i < bdlp->bfl_len; i++) {
+ switch (bdlp->bfl_list[i]) {
+
+ case DLT_IEEE802_11:
+ /*
+ * 802.11, but no radio.
+ *
+ * Offer this, and select it as the new mode
+ * unless we've already found an 802.11
+ * header with radio information.
+ */
+ if (new_dlt == -1)
+ new_dlt = bdlp->bfl_list[i];
+ break;
+
+ case DLT_PRISM_HEADER:
+ case DLT_AIRONET_HEADER:
+ case DLT_IEEE802_11_RADIO_AVS:
+ /*
+ * 802.11 with radio, but not radiotap.
+ *
+ * Offer this, and select it as the new mode
+ * unless we've already found the radiotap DLT_.
+ */
+ if (new_dlt != DLT_IEEE802_11_RADIO)
+ new_dlt = bdlp->bfl_list[i];
+ break;
+
+ case DLT_IEEE802_11_RADIO:
+ /*
+ * 802.11 with radiotap.
+ *
+ * Offer this, and select it as the new mode.
+ */
+ new_dlt = bdlp->bfl_list[i];
+ break;
+
+ default:
+ /*
+ * Not 802.11.
+ */
+ break;
+ }
+ }
+
+ return (new_dlt);
+}
+#endif /* defined(BIOCGDLTLIST) && (defined(__APPLE__) || defined(HAVE_BSD_IEEE80211)) */
+
+#if defined(__APPLE__) && defined(BIOCGDLTLIST)
+/*
+ * Remove DLT_EN10MB from the list of DLT_ values, as we're in monitor mode,
+ * and DLT_EN10MB isn't supported in monitor mode.
+ */
+static void
+remove_en(pcap_t *p)
+{
+ int i, j;
+
+ /*
+ * Scan the list of DLT_ values and discard DLT_EN10MB.
+ */
+ j = 0;
+ for (i = 0; i < p->dlt_count; i++) {
+ switch (p->dlt_list[i]) {
+
+ case DLT_EN10MB:
+ /*
+ * Don't offer this one.
+ */
+ continue;
+
+ default:
+ /*
+ * Just copy this mode over.
+ */
+ break;
+ }
+
+ /*
+ * Copy this DLT_ value to its new position.
+ */
+ p->dlt_list[j] = p->dlt_list[i];
+ j++;
+ }
+
+ /*
+ * Set the DLT_ count to the number of entries we copied.
+ */
+ p->dlt_count = j;
+}
+
+/*
+ * Remove 802.11 link-layer types from the list of DLT_ values, as
+ * we're not in monitor mode, and those DLT_ values will switch us
+ * to monitor mode.
+ */
+static void
+remove_802_11(pcap_t *p)
+{
+ int i, j;
+
+ /*
+ * Scan the list of DLT_ values and discard 802.11 values.
+ */
+ j = 0;
+ for (i = 0; i < p->dlt_count; i++) {
+ switch (p->dlt_list[i]) {
+
+ case DLT_IEEE802_11:
+ case DLT_PRISM_HEADER:
+ case DLT_AIRONET_HEADER:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_IEEE802_11_RADIO_AVS:
+ /*
+ * 802.11. Don't offer this one.
+ */
+ continue;
+
+ default:
+ /*
+ * Just copy this mode over.
+ */
+ break;
+ }
+
+ /*
+ * Copy this DLT_ value to its new position.
+ */
+ p->dlt_list[j] = p->dlt_list[i];
+ j++;
+ }
+
+ /*
+ * Set the DLT_ count to the number of entries we copied.
+ */
+ p->dlt_count = j;
+}
+#endif /* defined(__APPLE__) && defined(BIOCGDLTLIST) */
+
static int
pcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp)
{
- /*
- * It looks that BPF code generated by gen_protochain() is not
- * compatible with some of kernel BPF code (for example BSD/OS 3.1).
- * Take a safer side for now.
- */
- if (no_optimize) {
- /*
- * XXX - what if we already have a filter in the kernel?
- */
- if (install_bpf_program(p, fp) < 0)
- return (-1);
- p->md.use_bpf = 0; /* filtering in userland */
- return (0);
- }
+ struct pcap_bpf *pb = p->priv;
/*
* Free any user-mode filter we might happen to have installed.
@@ -1078,20 +2616,51 @@
/*
* Try to install the kernel filter.
*/
- if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
+ if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) == 0) {
+ /*
+ * It worked.
+ */
+ pb->filtering_in_kernel = 1; /* filtering in the kernel */
+
+ /*
+ * 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 failed.
+ *
+ * If it failed with EINVAL, that's probably because the program
+ * is invalid or too big. Validate it ourselves; if we like it
+ * (we currently allow backward branches, to support protochain),
+ * run it in userland. (There's no notion of "too big" for
+ * userland.)
+ *
+ * Otherwise, just give up.
+ * XXX - if the copy of the program into the kernel failed,
+ * we will get EINVAL rather than, say, EFAULT on at least
+ * some kernels.
+ */
+ if (errno != EINVAL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s",
pcap_strerror(errno));
return (-1);
}
- p->md.use_bpf = 1; /* filtering in the kernel */
/*
- * 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).
+ * install_bpf_program() validates the program.
+ *
+ * XXX - what if we already have a filter in the kernel?
*/
- p->cc = 0;
+ if (install_bpf_program(p, fp) < 0)
+ return (-1);
+ pb->filtering_in_kernel = 0; /* filtering in userland */
return (0);
}