* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.44 2002-12-22 02:36:49 guy Exp $ (LBL)";
-#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
/* Forwards */
static int nit_setflags(int, int, int, char *);
-int
-pcap_stats(pcap_t *p, struct pcap_stat *ps)
+/*
+ * Private data for capturing on NIT devices.
+ */
+struct pcap_nit {
+ struct pcap_stat stat;
+};
+
+static int
+pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
{
+ struct pcap_nit *pn = p->priv;
/*
* "ps_recv" counts packets handed to the filter, not packets
* kernel by libpcap or packets not yet read from libpcap by the
* application.
*/
- *ps = p->md.stat;
+ *ps = pn->stat;
return (0);
}
-int
-pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+static int
+pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
+ struct pcap_nit *pn = p->priv;
register int cc, n;
- register struct bpf_insn *fcode = p->fcode.bf_insns;
register u_char *bp, *cp, *ep;
register struct nit_hdr *nh;
register int caplen;
if (cc < 0) {
if (errno == EWOULDBLOCK)
return (0);
- snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
+ pcap_snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
pcap_strerror(errno));
return (-1);
}
- bp = p->buffer;
+ bp = (u_char *)p->buffer;
} else
bp = p->bp;
n = 0;
ep = bp + cc;
while (bp < ep) {
+ /*
+ * Has "pcap_breakloop()" been called?
+ * If so, return immediately - if we haven't read any
+ * packets, clear the flag and return -2 to indicate
+ * that we were told to break out of the loop, otherwise
+ * leave the flag set, so that the *next* call will break
+ * out of the loop without having read any packets, and
+ * return the number of packets we've processed so far.
+ */
+ if (p->break_loop) {
+ if (n == 0) {
+ p->break_loop = 0;
+ return (-2);
+ } else {
+ p->cc = ep - bp;
+ p->bp = bp;
+ return (n);
+ }
+ }
+
nh = (struct nit_hdr *)bp;
cp = bp + sizeof(*nh);
case NIT_NOMBUF:
case NIT_NOCLUSTER:
case NIT_NOSPACE:
- p->md.stat.ps_drop = nh->nh_dropped;
+ pn->stat.ps_drop = nh->nh_dropped;
continue;
case NIT_SEQNO:
continue;
default:
- snprintf(p->errbuf, sizeof(p->errbuf),
+ pcap_snprintf(p->errbuf, sizeof(p->errbuf),
"bad nit state %d", nh->nh_state);
return (-1);
}
- ++p->md.stat.ps_recv;
+ ++pn->stat.ps_recv;
bp += ((sizeof(struct nit_hdr) + nh->nh_datalen +
sizeof(int) - 1) & ~(sizeof(int) - 1));
caplen = nh->nh_wirelen;
if (caplen > p->snapshot)
caplen = p->snapshot;
- if (bpf_filter(fcode, cp, nh->nh_wirelen, caplen)) {
+ if (bpf_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
struct pcap_pkthdr h;
h.ts = nh->nh_timestamp;
h.len = nh->nh_wirelen;
h.caplen = caplen;
(*callback)(user, &h, cp);
- if (++n >= cnt && cnt >= 0) {
+ if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
p->cc = ep - bp;
p->bp = bp;
return (n);
}
static int
-nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
+pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
+{
+ struct sockaddr sa;
+ int ret;
+
+ memset(&sa, 0, sizeof(sa));
+ strncpy(sa.sa_data, device, sizeof(sa.sa_data));
+ ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
+ if (ret == -1) {
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
+ pcap_strerror(errno));
+ return (-1);
+ }
+ return (ret);
+}
+
+static int
+nit_setflags(pcap_t *p)
{
struct nit_ioc nioc;
memset(&nioc, 0, sizeof(nioc));
- nioc.nioc_bufspace = BUFSPACE;
- nioc.nioc_chunksize = CHUNKSIZE;
nioc.nioc_typetomatch = NT_ALLTYPES;
nioc.nioc_snaplen = p->snapshot;
nioc.nioc_bufalign = sizeof(int);
nioc.nioc_bufoffset = 0;
- if (to_ms != 0) {
+ if (p->opt.buffer_size != 0)
+ nioc.nioc_bufspace = p->opt.buffer_size;
+ else {
+ /* Default buffer size */
+ nioc.nioc_bufspace = BUFSPACE;
+ }
+
+ if (p->opt.immediate) {
+ /*
+ * XXX - will this cause packets to be delivered immediately?
+ * XXX - given that this is for SunOS prior to 4.0, do
+ * we care?
+ */
+ nioc.nioc_chunksize = 0;
+ } else
+ nioc.nioc_chunksize = CHUNKSIZE;
+ if (p->opt.timeout != 0) {
nioc.nioc_flags |= NF_TIMEOUT;
- nioc.nioc_timeout.tv_sec = to_ms / 1000;
- nioc.nioc_timeout.tv_usec = (to_ms * 1000) % 1000000;
+ nioc.nioc_timeout.tv_sec = p->opt.timeout / 1000;
+ nioc.nioc_timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
}
- if (promisc)
+ if (p->opt.promisc)
nioc.nioc_flags |= NF_PROMISC;
- if (ioctl(fd, SIOCSNIT, &nioc) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
+ if (ioctl(p->fd, SIOCSNIT, &nioc) < 0) {
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
pcap_strerror(errno));
return (-1);
}
return (0);
}
-pcap_t *
-pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
- char *ebuf)
+static int
+pcap_activate_nit(pcap_t *p)
{
int fd;
struct sockaddr_nit snit;
- register pcap_t *p;
- p = (pcap_t *)malloc(sizeof(*p));
- if (p == NULL) {
- strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
- return (NULL);
+ if (p->opt.rfmon) {
+ /*
+ * No monitor mode on SunOS 3.x or earlier (no
+ * Wi-Fi *devices* for the hardware that supported
+ * them!).
+ */
+ return (PCAP_ERROR_RFMON_NOTSUP);
}
- if (snaplen < 96)
+ if (p->snapshot < 96)
/*
* NIT requires a snapshot length of at least 96.
*/
- snaplen = 96;
+ p->snapshot = 96;
memset(p, 0, sizeof(*p));
p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
if (fd < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"socket: %s", pcap_strerror(errno));
goto bad;
}
snit.snit_family = AF_NIT;
- (void)strncpy(snit.snit_ifname, device, NITIFSIZ);
+ (void)strncpy(snit.snit_ifname, p->opt.device, NITIFSIZ);
if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,
+ /*
+ * XXX - there's probably a particular bind error that
+ * means "there's no such device" and a particular bind
+ * error that means "that device doesn't support NIT";
+ * they might be the same error, if they both end up
+ * meaning "NIT doesn't know about that device".
+ */
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"bind: %s: %s", snit.snit_ifname, pcap_strerror(errno));
goto bad;
}
- p->snapshot = snaplen;
- nit_setflags(p->fd, promisc, to_ms, ebuf);
+ if (nit_setflags(p) < 0)
+ goto bad;
/*
* NIT supports only ethernets.
p->linktype = DLT_EN10MB;
p->bufsize = BUFSPACE;
- p->buffer = (u_char *)malloc(p->bufsize);
+ p->buffer = malloc(p->bufsize);
if (p->buffer == NULL) {
- strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+ strlcpy(p->errbuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
goto bad;
}
- return (p);
+
+ /*
+ * "p->fd" is a socket, so "select()" should work on it.
+ */
+ p->selectable_fd = p->fd;
+
+ /*
+ * This is (presumably) a real Ethernet capture; give it a
+ * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
+ * that an application can let you choose it, in case you're
+ * capturing DOCSIS traffic that a Cisco Cable Modem
+ * Termination System is putting out onto an Ethernet (it
+ * doesn't put an Ethernet header onto the wire, it puts raw
+ * DOCSIS frames out on the wire inside the low-level
+ * Ethernet framing).
+ */
+ p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
+ /*
+ * If that fails, just leave the list empty.
+ */
+ if (p->dlt_list != NULL) {
+ p->dlt_list[0] = DLT_EN10MB;
+ p->dlt_list[1] = DLT_DOCSIS;
+ p->dlt_count = 2;
+ }
+
+ p->read_op = pcap_read_nit;
+ p->inject_op = pcap_inject_nit;
+ p->setfilter_op = install_bpf_program; /* no kernel filtering */
+ p->setdirection_op = NULL; /* Not implemented. */
+ p->set_datalink_op = NULL; /* can't change data link type */
+ p->getnonblock_op = pcap_getnonblock_fd;
+ p->setnonblock_op = pcap_setnonblock_fd;
+ p->stats_op = pcap_stats_nit;
+
+ return (0);
bad:
- if (fd >= 0)
- close(fd);
- free(p);
- return (NULL);
+ pcap_cleanup_live_common(p);
+ return (PCAP_ERROR);
}
-int
-pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+pcap_t *
+pcap_create_interface(const char *device _U_, char *ebuf)
{
- return (0);
+ pcap_t *p;
+
+ p = pcap_create_common(ebuf, sizeof (struct pcap_nit));
+ if (p == NULL)
+ return (NULL);
+
+ p->activate_op = pcap_activate_nit;
+ return (p);
}
-int
-pcap_setfilter(pcap_t *p, struct bpf_program *fp)
+/*
+ * XXX - there's probably a particular bind error that means "that device
+ * doesn't support NIT"; if so, we should try a bind and use that.
+ */
+static int
+can_be_bound(const char *name _U_)
{
-
- if (install_bpf_program(p, fp) < 0)
- return (-1);
- return (0);
+ return (1);
}
int
-pcap_set_datalink_platform(pcap_t *p, int dlt)
+pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
- return (0);
+ return (pcap_findalldevs_interfaces(alldevsp, errbuf, can_be_bound));
}
projects / libpcap / blobdiff