Don't assume that p->fcode.bpf_insns remains unchanged while processing
a bufferfull of packets - it could get changed in a callback routine.
This commit is contained in:
guy
parent
c08008781b
commit
fba7e3f7df
988
pcap-bpf.c
988
pcap-bpf.c
File diff suppressed because it is too large
Load Diff
1371
pcap-dlpi.c
1371
pcap-dlpi.c
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
157
pcap-nit.c
157
pcap-nit.c
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@ -19,8 +19,12 @@
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.31.1.1 1999-10-07 23:46:40 mcr Exp $ (LBL)";
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.58.2.1 2007-12-05 23:38:11 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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@ -49,7 +53,6 @@ static const char rcsid[] =
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#include "pcap-int.h"
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#include "gnuc.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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@ -68,19 +71,34 @@ static const char rcsid[] =
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/* Forwards */
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static int nit_setflags(int, int, int, char *);
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int
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pcap_stats(pcap_t *p, struct pcap_stat *ps)
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static int
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pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
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{
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter. As filtering is done in userland,
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* this does not include packets dropped because we ran out
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* of buffer space.
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*
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* "ps_drop" presumably counts packets dropped by the socket
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* because of flow control requirements or resource exhaustion;
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* it doesn't count packets dropped by the interface driver.
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* As filtering is done in userland, it counts packets regardless
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* of whether they would've passed the filter.
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*
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* These statistics don't include packets not yet read from the
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* kernel by libpcap or packets not yet read from libpcap by the
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* application.
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*/
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*ps = p->md.stat;
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return (0);
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}
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int
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pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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static int
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pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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register int cc, n;
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register struct bpf_insn *fcode = p->fcode.bf_insns;
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register u_char *bp, *cp, *ep;
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register struct nit_hdr *nh;
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register int caplen;
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@ -91,7 +109,7 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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if (cc < 0) {
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if (errno == EWOULDBLOCK)
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return (0);
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sprintf(p->errbuf, "pcap_read: %s",
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snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
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pcap_strerror(errno));
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return (-1);
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}
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@ -107,6 +125,26 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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n = 0;
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ep = bp + cc;
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while (bp < ep) {
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/*
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* Has "pcap_breakloop()" been called?
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* If so, return immediately - if we haven't read any
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* packets, clear the flag and return -2 to indicate
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* that we were told to break out of the loop, otherwise
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* leave the flag set, so that the *next* call will break
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* out of the loop without having read any packets, and
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* return the number of packets we've processed so far.
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*/
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if (p->break_loop) {
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if (n == 0) {
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p->break_loop = 0;
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return (-2);
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} else {
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p->cc = ep - bp;
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p->bp = bp;
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return (n);
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}
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}
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nh = (struct nit_hdr *)bp;
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cp = bp + sizeof(*nh);
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@ -125,7 +163,8 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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continue;
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default:
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sprintf(p->errbuf, "bad nit state %d", nh->nh_state);
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snprintf(p->errbuf, sizeof(p->errbuf),
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"bad nit state %d", nh->nh_state);
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return (-1);
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}
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++p->md.stat.ps_recv;
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@ -135,7 +174,7 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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caplen = nh->nh_wirelen;
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if (caplen > p->snapshot)
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caplen = p->snapshot;
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if (bpf_filter(fcode, cp, nh->nh_wirelen, caplen)) {
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if (bpf_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
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struct pcap_pkthdr h;
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h.ts = nh->nh_timestamp;
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h.len = nh->nh_wirelen;
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@ -152,12 +191,29 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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return (n);
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}
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static int
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pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
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{
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struct sockaddr sa;
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int ret;
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memset(&sa, 0, sizeof(sa));
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strncpy(sa.sa_data, device, sizeof(sa.sa_data));
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ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
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if (ret == -1) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
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pcap_strerror(errno));
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return (-1);
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}
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return (ret);
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}
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static int
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nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
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{
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struct nit_ioc nioc;
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bzero((char *)&nioc, sizeof(nioc));
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memset(&nioc, 0, sizeof(nioc));
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nioc.nioc_bufspace = BUFSPACE;
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nioc.nioc_chunksize = CHUNKSIZE;
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nioc.nioc_typetomatch = NT_ALLTYPES;
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@ -174,14 +230,24 @@ nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
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nioc.nioc_flags |= NF_PROMISC;
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if (ioctl(fd, SIOCSNIT, &nioc) < 0) {
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sprintf(ebuf, "SIOCSNIT: %s", pcap_strerror(errno));
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snprintf(ebuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
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pcap_strerror(errno));
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return (-1);
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}
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return (0);
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}
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static void
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pcap_close_nit(pcap_t *p)
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{
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pcap_close_common(p);
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if (p->device != NULL)
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free(p->device);
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}
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pcap_t *
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pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
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char *ebuf)
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{
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int fd;
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struct sockaddr_nit snit;
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@ -189,7 +255,7 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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p = (pcap_t *)malloc(sizeof(*p));
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if (p == NULL) {
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strcpy(ebuf, pcap_strerror(errno));
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strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
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return (NULL);
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}
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@ -199,18 +265,19 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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*/
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snaplen = 96;
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bzero(p, sizeof(*p));
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memset(p, 0, sizeof(*p));
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p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
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if (fd < 0) {
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sprintf(ebuf, "socket: %s", pcap_strerror(errno));
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snprintf(ebuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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goto bad;
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}
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snit.snit_family = AF_NIT;
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(void)strncpy(snit.snit_ifname, device, NITIFSIZ);
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if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
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sprintf(ebuf, "bind: %s: %s", snit.snit_ifname,
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pcap_strerror(errno));
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snprintf(ebuf, PCAP_ERRBUF_SIZE,
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"bind: %s: %s", snit.snit_ifname, pcap_strerror(errno));
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goto bad;
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}
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p->snapshot = snaplen;
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@ -224,9 +291,55 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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p->bufsize = BUFSPACE;
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p->buffer = (u_char *)malloc(p->bufsize);
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if (p->buffer == NULL) {
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strcpy(ebuf, pcap_strerror(errno));
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strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
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goto bad;
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}
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/*
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* We need the device name in order to send packets.
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*/
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p->device = strdup(device);
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if (p->device == NULL) {
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strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
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free(p->buffer);
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goto bad;
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}
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/*
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* "p->fd" is a socket, so "select()" should work on it.
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*/
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p->selectable_fd = p->fd;
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/*
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* This is (presumably) a real Ethernet capture; give it a
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* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
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* that an application can let you choose it, in case you're
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* capturing DOCSIS traffic that a Cisco Cable Modem
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* Termination System is putting out onto an Ethernet (it
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* doesn't put an Ethernet header onto the wire, it puts raw
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* DOCSIS frames out on the wire inside the low-level
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* Ethernet framing).
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*/
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p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
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/*
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* If that fails, just leave the list empty.
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*/
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if (p->dlt_list != NULL) {
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p->dlt_list[0] = DLT_EN10MB;
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p->dlt_list[1] = DLT_DOCSIS;
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p->dlt_count = 2;
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}
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p->read_op = pcap_read_nit;
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p->inject_op = pcap_inject_nit;
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p->setfilter_op = install_bpf_program; /* no kernel filtering */
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p->setdirection_op = NULL; /* Not implemented. */
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p->set_datalink_op = NULL; /* can't change data link type */
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p->getnonblock_op = pcap_getnonblock_fd;
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p->setnonblock_op = pcap_setnonblock_fd;
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p->stats_op = pcap_stats_nit;
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p->close_op = pcap_close_nit;
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return (p);
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bad:
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if (fd >= 0)
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|
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@ -236,9 +349,7 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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}
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int
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pcap_setfilter(pcap_t *p, struct bpf_program *fp)
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pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
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||||
{
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||||
|
||||
p->fcode = *fp;
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return (0);
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}
|
||||
|
|
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|||
424
pcap-pf.c
424
pcap-pf.c
|
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@ -23,8 +23,12 @@
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|||
*/
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||||
|
||||
#ifndef lint
|
||||
static const char rcsid[] =
|
||||
"@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.54.1.1 1999-10-07 23:46:40 mcr Exp $ (LBL)";
|
||||
static const char rcsid[] _U_ =
|
||||
"@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.94.2.1 2007-12-05 23:38:11 guy Exp $ (LBL)";
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "config.h"
|
||||
#endif
|
||||
|
||||
#include <sys/types.h>
|
||||
|
|
@ -35,11 +39,8 @@ static const char rcsid[] =
|
|||
#include <sys/ioctl.h>
|
||||
#include <net/pfilt.h>
|
||||
|
||||
#if __STDC__
|
||||
struct mbuf;
|
||||
struct rtentry;
|
||||
#endif
|
||||
|
||||
#include <net/if.h>
|
||||
|
||||
#include <netinet/in.h>
|
||||
|
|
@ -60,13 +61,21 @@ struct rtentry;
|
|||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
|
||||
/*
|
||||
* Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
|
||||
* native OS version, as we need various BPF ioctls from it.
|
||||
*/
|
||||
#define PCAP_DONT_INCLUDE_PCAP_BPF_H
|
||||
#include <net/bpf.h>
|
||||
|
||||
#include "pcap-int.h"
|
||||
|
||||
#include "gnuc.h"
|
||||
#ifdef HAVE_OS_PROTO_H
|
||||
#include "os-proto.h"
|
||||
#endif
|
||||
|
||||
static int pcap_setfilter_pf(pcap_t *, struct bpf_program *);
|
||||
|
||||
/*
|
||||
* BUFSPACE is the size in bytes of the packet read buffer. Most tcpdump
|
||||
* applications aren't going to need more than 200 bytes of packet header
|
||||
|
|
@ -75,11 +84,10 @@ struct rtentry;
|
|||
*/
|
||||
#define BUFSPACE (200 * 256)
|
||||
|
||||
int
|
||||
pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
||||
static int
|
||||
pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
||||
{
|
||||
register u_char *p, *bp;
|
||||
struct bpf_insn *fcode;
|
||||
register int cc, n, buflen, inc;
|
||||
register struct enstamp *sp;
|
||||
#ifdef LBL_ALIGN
|
||||
|
|
@ -89,7 +97,6 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
register int pad;
|
||||
#endif
|
||||
|
||||
fcode = pc->md.use_bpf ? NULL : pc->fcode.bf_insns;
|
||||
again:
|
||||
cc = pc->cc;
|
||||
if (cc == 0) {
|
||||
|
|
@ -108,7 +115,7 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
(void)lseek(pc->fd, 0L, SEEK_SET);
|
||||
goto again;
|
||||
}
|
||||
sprintf(pc->errbuf, "pf read: %s",
|
||||
snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
|
|
@ -120,14 +127,31 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
*/
|
||||
n = 0;
|
||||
#ifdef PCAP_FDDIPAD
|
||||
if (pc->linktype == DLT_FDDI)
|
||||
pad = pcap_fddipad;
|
||||
else
|
||||
pad = 0;
|
||||
pad = pc->fddipad;
|
||||
#endif
|
||||
while (cc > 0) {
|
||||
/*
|
||||
* Has "pcap_breakloop()" been called?
|
||||
* If so, return immediately - if we haven't read any
|
||||
* packets, clear the flag and return -2 to indicate
|
||||
* that we were told to break out of the loop, otherwise
|
||||
* leave the flag set, so that the *next* call will break
|
||||
* out of the loop without having read any packets, and
|
||||
* return the number of packets we've processed so far.
|
||||
*/
|
||||
if (pc->break_loop) {
|
||||
if (n == 0) {
|
||||
pc->break_loop = 0;
|
||||
return (-2);
|
||||
} else {
|
||||
pc->cc = cc;
|
||||
pc->bp = bp;
|
||||
return (n);
|
||||
}
|
||||
}
|
||||
if (cc < sizeof(*sp)) {
|
||||
sprintf(pc->errbuf, "pf short read (%d)", cc);
|
||||
snprintf(pc->errbuf, sizeof(pc->errbuf),
|
||||
"pf short read (%d)", cc);
|
||||
return (-1);
|
||||
}
|
||||
#ifdef LBL_ALIGN
|
||||
|
|
@ -138,7 +162,8 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
#endif
|
||||
sp = (struct enstamp *)bp;
|
||||
if (sp->ens_stamplen != sizeof(*sp)) {
|
||||
sprintf(pc->errbuf, "pf short stamplen (%d)",
|
||||
snprintf(pc->errbuf, sizeof(pc->errbuf),
|
||||
"pf short stamplen (%d)",
|
||||
sp->ens_stamplen);
|
||||
return (-1);
|
||||
}
|
||||
|
|
@ -152,10 +177,6 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
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;
|
||||
|
|
@ -164,10 +185,19 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
|
||||
/*
|
||||
* 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
|
||||
* that pc->fddipad was the amount of padding
|
||||
* before the header, as that's what's required
|
||||
* in the kernel, so we run the filter before
|
||||
* skipping that padding.
|
||||
#endif
|
||||
*/
|
||||
if (fcode == NULL ||
|
||||
bpf_filter(fcode, p, sp->ens_count, buflen)) {
|
||||
if (pc->md.use_bpf ||
|
||||
bpf_filter(pc->fcode.bf_insns, p, sp->ens_count, buflen)) {
|
||||
struct pcap_pkthdr h;
|
||||
pc->md.TotAccepted++;
|
||||
h.ts = sp->ens_tstamp;
|
||||
|
|
@ -175,6 +205,10 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
h.len = sp->ens_count - pad;
|
||||
#else
|
||||
h.len = sp->ens_count;
|
||||
#endif
|
||||
#ifdef PCAP_FDDIPAD
|
||||
p += pad;
|
||||
buflen -= pad;
|
||||
#endif
|
||||
h.caplen = buflen;
|
||||
(*callback)(user, &h, p);
|
||||
|
|
@ -189,18 +223,77 @@ pcap_read(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
|
|||
return (n);
|
||||
}
|
||||
|
||||
int
|
||||
pcap_stats(pcap_t *p, struct pcap_stat *ps)
|
||||
static int
|
||||
pcap_inject_pf(pcap_t *p, const void *buf, size_t size)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = write(p->fd, buf, size);
|
||||
if (ret == -1) {
|
||||
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
return (ret);
|
||||
}
|
||||
|
||||
static int
|
||||
pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
|
||||
{
|
||||
|
||||
/*
|
||||
* If packet filtering is being done in the kernel:
|
||||
*
|
||||
* "ps_recv" counts only packets that passed the filter.
|
||||
* This does not include packets dropped because we
|
||||
* ran out of buffer space. (XXX - perhaps it should,
|
||||
* by adding "ps_drop" to "ps_recv", for compatibility
|
||||
* with some other platforms. On the other hand, on
|
||||
* some platforms "ps_recv" counts only packets that
|
||||
* passed the filter, and on others it counts packets
|
||||
* that didn't pass the filter....)
|
||||
*
|
||||
* "ps_drop" counts packets that passed the kernel filter
|
||||
* (if any) but were dropped because the input queue was
|
||||
* full.
|
||||
*
|
||||
* "ps_ifdrop" counts packets dropped by the network
|
||||
* inteface (regardless of whether they would have passed
|
||||
* the input filter, of course).
|
||||
*
|
||||
* If packet filtering is not being done in the kernel:
|
||||
*
|
||||
* "ps_recv" counts only packets that passed the filter.
|
||||
*
|
||||
* "ps_drop" counts packets that were dropped because the
|
||||
* input queue was full, regardless of whether they passed
|
||||
* the userland filter.
|
||||
*
|
||||
* "ps_ifdrop" counts packets dropped by the network
|
||||
* inteface (regardless of whether they would have passed
|
||||
* the input filter, of course).
|
||||
*
|
||||
* These statistics don't include packets not yet read from
|
||||
* the kernel by libpcap, but they may include packets not
|
||||
* yet read from libpcap by the application.
|
||||
*/
|
||||
ps->ps_recv = p->md.TotAccepted;
|
||||
ps->ps_drop = p->md.TotDrops;
|
||||
ps->ps_ifdrop = p->md.TotMissed - p->md.OrigMissed;
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* We include the OS's <net/bpf.h>, not our "pcap/bpf.h", so we probably
|
||||
* don't get DLT_DOCSIS defined.
|
||||
*/
|
||||
#ifndef DLT_DOCSIS
|
||||
#define DLT_DOCSIS 143
|
||||
#endif
|
||||
|
||||
pcap_t *
|
||||
pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
||||
pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
|
||||
char *ebuf)
|
||||
{
|
||||
pcap_t *p;
|
||||
short enmode;
|
||||
|
|
@ -210,14 +303,36 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
|
||||
p = (pcap_t *)malloc(sizeof(*p));
|
||||
if (p == NULL) {
|
||||
sprintf(ebuf, "pcap_open_live: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE,
|
||||
"pcap_open_live: %s", pcap_strerror(errno));
|
||||
return (0);
|
||||
}
|
||||
bzero((char *)p, sizeof(*p));
|
||||
p->fd = pfopen(device, O_RDONLY);
|
||||
memset(p, 0, sizeof(*p));
|
||||
/*
|
||||
* Initially try a read/write open (to allow the inject
|
||||
* method to work). If that fails due to permission
|
||||
* issues, fall back to read-only. This allows a
|
||||
* non-root user to be granted specific access to pcap
|
||||
* capabilities via file permissions.
|
||||
*
|
||||
* XXX - we should have an API that has a flag that
|
||||
* controls whether to open read-only or read-write,
|
||||
* so that denial of permission to send (or inability
|
||||
* to send, if sending packets isn't supported on
|
||||
* the device in question) can be indicated at open
|
||||
* time.
|
||||
*
|
||||
* XXX - we assume here that "pfopen()" does not, in fact, modify
|
||||
* its argument, even though it takes a "char *" rather than a
|
||||
* "const char *" as its first argument. That appears to be
|
||||
* the case, at least on Digital UNIX 4.0.
|
||||
*/
|
||||
p->fd = pfopen(device, O_RDWR);
|
||||
if (p->fd == -1 && errno == EACCES)
|
||||
p->fd = pfopen(device, O_RDONLY);
|
||||
if (p->fd < 0) {
|
||||
sprintf(ebuf, "pf open: %s: %s\n\
|
||||
your system may not be properly configured; see \"man packetfilter(4)\"\n",
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "pf open: %s: %s\n\
|
||||
your system may not be properly configured; see the packetfilter(4) man page\n",
|
||||
device, pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
|
|
@ -226,7 +341,8 @@ your system may not be properly configured; see \"man packetfilter(4)\"\n",
|
|||
if (promisc)
|
||||
enmode |= ENPROMISC;
|
||||
if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
|
||||
sprintf(ebuf, "EIOCMBIS: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
#ifdef ENCOPYALL
|
||||
|
|
@ -236,12 +352,14 @@ your system may not be properly configured; see \"man packetfilter(4)\"\n",
|
|||
#endif
|
||||
/* set the backlog */
|
||||
if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
|
||||
sprintf(ebuf, "EIOCSETW: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
/* discover interface type */
|
||||
if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
|
||||
sprintf(ebuf, "EIOCDEVP: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
/* HACK: to compile prior to Ultrix 4.2 */
|
||||
|
|
@ -253,45 +371,102 @@ your system may not be properly configured; see \"man packetfilter(4)\"\n",
|
|||
case ENDT_10MB:
|
||||
p->linktype = DLT_EN10MB;
|
||||
p->offset = 2;
|
||||
/*
|
||||
* This is (presumably) a real Ethernet capture; give it a
|
||||
* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
|
||||
* that an application can let you choose it, in case you're
|
||||
* capturing DOCSIS traffic that a Cisco Cable Modem
|
||||
* Termination System is putting out onto an Ethernet (it
|
||||
* doesn't put an Ethernet header onto the wire, it puts raw
|
||||
* DOCSIS frames out on the wire inside the low-level
|
||||
* Ethernet framing).
|
||||
*/
|
||||
p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
|
||||
/*
|
||||
* If that fails, just leave the list empty.
|
||||
*/
|
||||
if (p->dlt_list != NULL) {
|
||||
p->dlt_list[0] = DLT_EN10MB;
|
||||
p->dlt_list[1] = DLT_DOCSIS;
|
||||
p->dlt_count = 2;
|
||||
}
|
||||
break;
|
||||
|
||||
case ENDT_FDDI:
|
||||
p->linktype = DLT_FDDI;
|
||||
break;
|
||||
|
||||
default:
|
||||
/*
|
||||
* XXX
|
||||
* Currently, the Ultrix packet filter supports only
|
||||
* Ethernet and FDDI. Eventually, support for SLIP and PPP
|
||||
* (and possibly others: T1?) should be added.
|
||||
*/
|
||||
#ifdef notdef
|
||||
warning(
|
||||
"Packet filter data-link type %d unknown, assuming Ethernet",
|
||||
devparams.end_dev_type);
|
||||
#ifdef ENDT_SLIP
|
||||
case ENDT_SLIP:
|
||||
p->linktype = DLT_SLIP;
|
||||
break;
|
||||
#endif
|
||||
|
||||
#ifdef ENDT_PPP
|
||||
case ENDT_PPP:
|
||||
p->linktype = DLT_PPP;
|
||||
break;
|
||||
#endif
|
||||
|
||||
#ifdef ENDT_LOOPBACK
|
||||
case ENDT_LOOPBACK:
|
||||
/*
|
||||
* It appears to use Ethernet framing, at least on
|
||||
* Digital UNIX 4.0.
|
||||
*/
|
||||
p->linktype = DLT_EN10MB;
|
||||
p->offset = 2;
|
||||
break;
|
||||
#endif
|
||||
|
||||
#ifdef ENDT_TRN
|
||||
case ENDT_TRN:
|
||||
p->linktype = DLT_IEEE802;
|
||||
break;
|
||||
#endif
|
||||
|
||||
default:
|
||||
/*
|
||||
* XXX - what about ENDT_IEEE802? The pfilt.h header
|
||||
* file calls this "IEEE 802 networks (non-Ethernet)",
|
||||
* but that doesn't specify a specific link layer type;
|
||||
* it could be 802.4, or 802.5 (except that 802.5 is
|
||||
* ENDT_TRN), or 802.6, or 802.11, or.... That's why
|
||||
* DLT_IEEE802 was hijacked to mean Token Ring in various
|
||||
* BSDs, and why we went along with that hijacking.
|
||||
*
|
||||
* XXX - what about ENDT_HDLC and ENDT_NULL?
|
||||
* Presumably, as ENDT_OTHER is just "Miscellaneous
|
||||
* framing", there's not much we can do, as that
|
||||
* doesn't specify a particular type of header.
|
||||
*/
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown data-link type %u",
|
||||
devparams.end_dev_type);
|
||||
goto bad;
|
||||
}
|
||||
/* set truncation */
|
||||
#ifdef PCAP_FDDIPAD
|
||||
if (p->linktype == DLT_FDDI)
|
||||
if (p->linktype == DLT_FDDI) {
|
||||
p->fddipad = PCAP_FDDIPAD;
|
||||
|
||||
/* packetfilter includes the padding in the snapshot */
|
||||
snaplen += pcap_fddipad;
|
||||
snaplen += PCAP_FDDIPAD;
|
||||
} else
|
||||
p->fddipad = 0;
|
||||
#endif
|
||||
if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&snaplen) < 0) {
|
||||
sprintf(ebuf, "EIOCTRUNCATE: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
p->snapshot = snaplen;
|
||||
/* accept all packets */
|
||||
bzero((char *)&Filter, sizeof(Filter));
|
||||
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) {
|
||||
sprintf(ebuf, "EIOCSETF: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETF: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
|
||||
|
|
@ -300,52 +475,135 @@ your system may not be properly configured; see \"man packetfilter(4)\"\n",
|
|||
timeout.tv_sec = to_ms / 1000;
|
||||
timeout.tv_usec = (to_ms * 1000) % 1000000;
|
||||
if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
|
||||
sprintf(ebuf, "EIOCSRTIMEOUT: %s",
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
}
|
||||
|
||||
p->bufsize = BUFSPACE;
|
||||
p->buffer = (u_char*)malloc(p->bufsize + p->offset);
|
||||
if (p->buffer == NULL) {
|
||||
strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/*
|
||||
* "select()" and "poll()" work on packetfilter devices.
|
||||
*/
|
||||
p->selectable_fd = p->fd;
|
||||
|
||||
p->read_op = pcap_read_pf;
|
||||
p->inject_op = pcap_inject_pf;
|
||||
p->setfilter_op = pcap_setfilter_pf;
|
||||
p->setdirection_op = NULL; /* Not implemented. */
|
||||
p->set_datalink_op = NULL; /* can't change data link type */
|
||||
p->getnonblock_op = pcap_getnonblock_fd;
|
||||
p->setnonblock_op = pcap_setnonblock_fd;
|
||||
p->stats_op = pcap_stats_pf;
|
||||
p->close_op = pcap_close_common;
|
||||
|
||||
return (p);
|
||||
bad:
|
||||
if (p->fd >= 0)
|
||||
close(p->fd);
|
||||
/*
|
||||
* Get rid of any link-layer type list we allocated.
|
||||
*/
|
||||
if (p->dlt_list != NULL)
|
||||
free(p->dlt_list);
|
||||
free(p);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
int
|
||||
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
|
||||
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
|
||||
{
|
||||
/*
|
||||
* See if BIOCSETF works. If it does, the kernel supports
|
||||
* BPF-style filters, and we do not need to do post-filtering.
|
||||
*/
|
||||
p->md.use_bpf = (ioctl(p->fd, BIOCSETF, (caddr_t)fp) >= 0);
|
||||
if (p->md.use_bpf) {
|
||||
struct bpf_version bv;
|
||||
|
||||
if (ioctl(p->fd, BIOCVERSION, (caddr_t)&bv) < 0) {
|
||||
sprintf(p->errbuf, "BIOCVERSION: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
else if (bv.bv_major != BPF_MAJOR_VERSION ||
|
||||
bv.bv_minor < BPF_MINOR_VERSION) {
|
||||
fprintf(stderr,
|
||||
"requires bpf language %d.%d or higher; kernel is %d.%d",
|
||||
BPF_MAJOR_VERSION, BPF_MINOR_VERSION,
|
||||
bv.bv_major, bv.bv_minor);
|
||||
/* don't give up, just be inefficient */
|
||||
p->md.use_bpf = 0;
|
||||
}
|
||||
} else
|
||||
p->fcode = *fp;
|
||||
|
||||
/*XXX this goes in tcpdump*/
|
||||
if (p->md.use_bpf)
|
||||
fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
|
||||
else
|
||||
fprintf(stderr, "tcpdump: Filtering in user process\n");
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
|
||||
{
|
||||
struct bpf_version bv;
|
||||
|
||||
/*
|
||||
* See if BIOCVERSION works. If not, we assume the kernel doesn't
|
||||
* support BPF-style filters (it's not documented in the bpf(7)
|
||||
* or packetfiler(7) man pages, but the code used to fail if
|
||||
* BIOCSETF worked but BIOCVERSION didn't, and I've seen it do
|
||||
* kernel filtering in DU 4.0, so presumably BIOCVERSION works
|
||||
* there, at least).
|
||||
*/
|
||||
if (ioctl(p->fd, BIOCVERSION, (caddr_t)&bv) >= 0) {
|
||||
/*
|
||||
* OK, we have the version of the BPF interpreter;
|
||||
* is it the same major version as us, and the same
|
||||
* or better minor version?
|
||||
*/
|
||||
if (bv.bv_major == BPF_MAJOR_VERSION &&
|
||||
bv.bv_minor >= BPF_MINOR_VERSION) {
|
||||
/*
|
||||
* Yes. Try to install the filter.
|
||||
*/
|
||||
if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
|
||||
snprintf(p->errbuf, sizeof(p->errbuf),
|
||||
"BIOCSETF: %s", pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
|
||||
/*
|
||||
* OK, that succeeded. We're doing filtering in
|
||||
* the kernel. (We assume we don't have a
|
||||
* userland filter installed - that'd require
|
||||
* a previous version check to have failed but
|
||||
* this one to succeed.)
|
||||
*
|
||||
* XXX - this message should be supplied to the
|
||||
* application as a warning of some sort,
|
||||
* except that if it's a GUI application, it's
|
||||
* not clear that it should be displayed in
|
||||
* a window to annoy the user.
|
||||
*/
|
||||
fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
|
||||
p->md.use_bpf = 1;
|
||||
|
||||
/*
|
||||
* Discard any previously-received packets,
|
||||
* as they might have passed whatever filter
|
||||
* was formerly in effect, but might not pass
|
||||
* this filter (BIOCSETF discards packets buffered
|
||||
* in the kernel, so you can lose packets in any
|
||||
* case).
|
||||
*/
|
||||
p->cc = 0;
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* We can't use the kernel's BPF interpreter; don't give
|
||||
* up, just log a message and be inefficient.
|
||||
*
|
||||
* XXX - this should really be supplied to the application
|
||||
* as a warning of some sort.
|
||||
*/
|
||||
fprintf(stderr,
|
||||
"tcpdump: Requires BPF language %d.%d or higher; kernel is %d.%d\n",
|
||||
BPF_MAJOR_VERSION, BPF_MINOR_VERSION,
|
||||
bv.bv_major, bv.bv_minor);
|
||||
}
|
||||
|
||||
/*
|
||||
* We couldn't do filtering in the kernel; do it in userland.
|
||||
*/
|
||||
if (install_bpf_program(p, fp) < 0)
|
||||
return (-1);
|
||||
|
||||
/*
|
||||
* XXX - this message should be supplied by the application as
|
||||
* a warning of some sort.
|
||||
*/
|
||||
fprintf(stderr, "tcpdump: Filtering in user process\n");
|
||||
p->md.use_bpf = 0;
|
||||
return (0);
|
||||
}
|
||||
|
|
|
|||
178
pcap-snit.c
178
pcap-snit.c
|
|
@ -24,8 +24,12 @@
|
|||
*/
|
||||
|
||||
#ifndef lint
|
||||
static const char rcsid[] =
|
||||
"@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.45.1.1 1999-10-07 23:46:40 mcr Exp $ (LBL)";
|
||||
static const char rcsid[] _U_ =
|
||||
"@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.73.2.1 2007-12-05 23:38:11 guy Exp $ (LBL)";
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "config.h"
|
||||
#endif
|
||||
|
||||
#include <sys/types.h>
|
||||
|
|
@ -56,16 +60,12 @@ static const char rcsid[] =
|
|||
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#ifdef HAVE_MALLOC_H
|
||||
#include <malloc.h>
|
||||
#endif
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "pcap-int.h"
|
||||
|
||||
#include "gnuc.h"
|
||||
#ifdef HAVE_OS_PROTO_H
|
||||
#include "os-proto.h"
|
||||
#endif
|
||||
|
|
@ -84,19 +84,35 @@ static const char rcsid[] =
|
|||
/* Forwards */
|
||||
static int nit_setflags(int, int, int, char *);
|
||||
|
||||
int
|
||||
pcap_stats(pcap_t *p, struct pcap_stat *ps)
|
||||
static int
|
||||
pcap_stats_snit(pcap_t *p, struct pcap_stat *ps)
|
||||
{
|
||||
|
||||
/*
|
||||
* "ps_recv" counts packets handed to the filter, not packets
|
||||
* that passed the filter. As filtering is done in userland,
|
||||
* this does not include packets dropped because we ran out
|
||||
* of buffer space.
|
||||
*
|
||||
* "ps_drop" counts packets dropped inside the "/dev/nit"
|
||||
* device because of flow control requirements or resource
|
||||
* exhaustion; it doesn't count packets dropped by the
|
||||
* interface driver, or packets dropped upstream. As filtering
|
||||
* is done in userland, it counts packets regardless of whether
|
||||
* they would've passed the filter.
|
||||
*
|
||||
* These statistics don't include packets not yet read from the
|
||||
* kernel by libpcap or packets not yet read from libpcap by the
|
||||
* application.
|
||||
*/
|
||||
*ps = p->md.stat;
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
||||
static int
|
||||
pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
||||
{
|
||||
register int cc, n;
|
||||
register struct bpf_insn *fcode = p->fcode.bf_insns;
|
||||
register u_char *bp, *cp, *ep;
|
||||
register struct nit_bufhdr *hdrp;
|
||||
register struct nit_iftime *ntp;
|
||||
|
|
@ -110,7 +126,7 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
|||
if (cc < 0) {
|
||||
if (errno == EWOULDBLOCK)
|
||||
return (0);
|
||||
sprintf(p->errbuf, "pcap_read: %s",
|
||||
snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
|
|
@ -124,6 +140,26 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
|||
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->bp = bp;
|
||||
p->cc = ep - bp;
|
||||
return (n);
|
||||
}
|
||||
}
|
||||
|
||||
++p->md.stat.ps_recv;
|
||||
cp = bp;
|
||||
|
||||
|
|
@ -150,7 +186,7 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
|||
if (caplen > p->snapshot)
|
||||
caplen = p->snapshot;
|
||||
|
||||
if (bpf_filter(fcode, cp, nlp->nh_pktlen, caplen)) {
|
||||
if (bpf_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) {
|
||||
struct pcap_pkthdr h;
|
||||
h.ts = ntp->nh_timestamp;
|
||||
h.len = nlp->nh_pktlen;
|
||||
|
|
@ -167,6 +203,29 @@ pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
|||
return (n);
|
||||
}
|
||||
|
||||
static int
|
||||
pcap_inject_snit(pcap_t *p, const void *buf, size_t size)
|
||||
{
|
||||
struct strbuf ctl, data;
|
||||
|
||||
/*
|
||||
* XXX - can we just do
|
||||
*
|
||||
ret = write(pd->f, buf, size);
|
||||
*/
|
||||
ctl.len = sizeof(*sa); /* XXX - what was this? */
|
||||
ctl.buf = (char *)sa;
|
||||
data.buf = buf;
|
||||
data.len = size;
|
||||
ret = putmsg(p->fd, &ctl, &data);
|
||||
if (ret == -1) {
|
||||
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
return (ret);
|
||||
}
|
||||
|
||||
static int
|
||||
nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
|
||||
{
|
||||
|
|
@ -182,7 +241,8 @@ nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
|
|||
si.ic_len = sizeof(timeout);
|
||||
si.ic_dp = (char *)&timeout;
|
||||
if (ioctl(fd, I_STR, (char *)&si) < 0) {
|
||||
sprintf(ebuf, "NIOCSTIME: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSTIME: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
}
|
||||
|
|
@ -193,14 +253,16 @@ nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
|
|||
si.ic_len = sizeof(flags);
|
||||
si.ic_dp = (char *)&flags;
|
||||
if (ioctl(fd, I_STR, (char *)&si) < 0) {
|
||||
sprintf(ebuf, "NIOCSFLAGS: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSFLAGS: %s",
|
||||
pcap_strerror(errno));
|
||||
return (-1);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
|
||||
pcap_t *
|
||||
pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
||||
pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
|
||||
char *ebuf)
|
||||
{
|
||||
struct strioctl si; /* struct for ioctl() */
|
||||
struct ifreq ifr; /* interface request struct */
|
||||
|
|
@ -211,7 +273,7 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
|
||||
p = (pcap_t *)malloc(sizeof(*p));
|
||||
if (p == NULL) {
|
||||
strcpy(ebuf, pcap_strerror(errno));
|
||||
strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
|
|
@ -221,20 +283,39 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
*/
|
||||
snaplen = 96;
|
||||
|
||||
bzero(p, sizeof(*p));
|
||||
p->fd = fd = open(dev, O_RDONLY);
|
||||
memset(p, 0, sizeof(*p));
|
||||
/*
|
||||
* Initially try a read/write open (to allow the inject
|
||||
* method to work). If that fails due to permission
|
||||
* issues, fall back to read-only. This allows a
|
||||
* non-root user to be granted specific access to pcap
|
||||
* capabilities via file permissions.
|
||||
*
|
||||
* XXX - we should have an API that has a flag that
|
||||
* controls whether to open read-only or read-write,
|
||||
* so that denial of permission to send (or inability
|
||||
* to send, if sending packets isn't supported on
|
||||
* the device in question) can be indicated at open
|
||||
* time.
|
||||
*/
|
||||
p->fd = fd = open(dev, O_RDWR);
|
||||
if (fd < 0 && errno == EACCES)
|
||||
p->fd = fd = open(dev, O_RDONLY);
|
||||
if (fd < 0) {
|
||||
sprintf(ebuf, "%s: %s", dev, pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s", dev,
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/* arrange to get discrete messages from the STREAM and use NIT_BUF */
|
||||
if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {
|
||||
sprintf(ebuf, "I_SRDOPT: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "I_SRDOPT: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
if (ioctl(fd, I_PUSH, "nbuf") < 0) {
|
||||
sprintf(ebuf, "push nbuf: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "push nbuf: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
/* set the chunksize */
|
||||
|
|
@ -243,18 +324,19 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
si.ic_len = sizeof(chunksize);
|
||||
si.ic_dp = (char *)&chunksize;
|
||||
if (ioctl(fd, I_STR, (char *)&si) < 0) {
|
||||
sprintf(ebuf, "NIOCSCHUNK: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/* request the interface */
|
||||
strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
|
||||
ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
|
||||
ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
|
||||
si.ic_cmd = NIOCBIND;
|
||||
si.ic_len = sizeof(ifr);
|
||||
si.ic_dp = (char *)𝔦
|
||||
if (ioctl(fd, I_STR, (char *)&si) < 0) {
|
||||
sprintf(ebuf, "NIOCBIND: %s: %s",
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCBIND: %s: %s",
|
||||
ifr.ifr_name, pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
|
|
@ -264,7 +346,8 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
si.ic_len = sizeof(snaplen);
|
||||
si.ic_dp = (char *)&snaplen;
|
||||
if (ioctl(fd, I_STR, (char *)&si) < 0) {
|
||||
sprintf(ebuf, "NIOCSSNAP: %s", pcap_strerror(errno));
|
||||
snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSSNAP: %s",
|
||||
pcap_strerror(errno));
|
||||
goto bad;
|
||||
}
|
||||
p->snapshot = snaplen;
|
||||
|
|
@ -280,9 +363,46 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
p->bufsize = BUFSPACE;
|
||||
p->buffer = (u_char *)malloc(p->bufsize);
|
||||
if (p->buffer == NULL) {
|
||||
strcpy(ebuf, pcap_strerror(errno));
|
||||
strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/*
|
||||
* "p->fd" is an FD for a STREAMS device, so "select()" and
|
||||
* "poll()" 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_snit;
|
||||
p->inject_op = pcap_inject_snit;
|
||||
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_snit;
|
||||
p->close_op = pcap_close_common;
|
||||
|
||||
return (p);
|
||||
bad:
|
||||
if (fd >= 0)
|
||||
|
|
@ -292,9 +412,7 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
|
|||
}
|
||||
|
||||
int
|
||||
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
|
||||
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
|
||||
{
|
||||
|
||||
p->fcode = *fp;
|
||||
return (0);
|
||||
}
|
||||
|
|
|
|||
Reference in New Issue