"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
The Regents of the University of California. All rights reserved.\n";
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.188 2002-11-11 19:54:40 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.216 2003-11-04 07:29:16 guy Exp $ (LBL)";
#endif
/*
#include <stdlib.h>
#include <string.h>
-
#include "interface.h"
#include "addrtoname.h"
#include "machdep.h"
#include "setsignal.h"
#include "gmt2local.h"
+#include "pcap-missing.h"
-int aflag; /* translate network and broadcast addresses */
int dflag; /* print filter code */
int eflag; /* print ethernet header */
int fflag; /* don't translate "foreign" IP address */
+int Lflag; /* list available data link types and exit */
int nflag; /* leave addresses as numbers */
int Nflag; /* remove domains from printed host names */
int Oflag = 1; /* run filter code optimizer */
int sflag = 0; /* use the libsmi to translate OIDs */
int Sflag; /* print raw TCP sequence numbers */
int tflag = 1; /* print packet arrival time */
+int Uflag = 0; /* "unbuffered" output of dump files */
int uflag = 0; /* Print undecoded NFS handles */
int vflag; /* verbose */
int xflag; /* print packet in hex */
int Xflag; /* print packet in ascii as well as hex */
off_t Cflag = 0; /* rotate dump files after this many bytes */
int Aflag = 0; /* print packet only in ascii observing LF, CR, TAB, SPACE */
+int dlt = -1; /* if != -1, ask libpcap for the DLT it names */
+
+const char *dlt_name = NULL;
char *espsecret = NULL; /* ESP secret key */
int packettype;
-int infodelay;
-int infoprint;
+static int infodelay;
+static int infoprint;
char *program_name;
/* Forwards */
static RETSIGTYPE cleanup(int);
static void usage(void) __attribute__((noreturn));
+static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
+static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
RETSIGTYPE requestinfo(int);
#endif
+static void info(int);
+static u_int packets_captured;
+
/* Length of saved portion of packet. */
int snaplen = DEFAULT_SNAPLEN;
+typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
+
struct printer {
- pcap_handler f;
+ if_printer f;
int type;
};
static struct printer printers[] = {
{ arcnet_if_print, DLT_ARCNET },
+#ifdef DLT_ARCNET_LINUX
+ { arcnet_linux_if_print, DLT_ARCNET_LINUX },
+#endif
{ ether_if_print, DLT_EN10MB },
{ token_if_print, DLT_IEEE802 },
#ifdef DLT_LANE8023
{ cip_if_print, DLT_ATM_CLIP },
#endif
{ sl_if_print, DLT_SLIP },
+#ifdef DLT_SLIP_BSDOS
{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
+#endif
{ ppp_if_print, DLT_PPP },
+#ifdef DLT_PPP_BSDOS
{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
+#endif
{ fddi_if_print, DLT_FDDI },
{ null_if_print, DLT_NULL },
#ifdef DLT_LOOP
#endif
#ifdef DLT_IP_OVER_FC
{ ipfc_if_print, DLT_IP_OVER_FC },
+#endif
+#ifdef DLT_PRISM_HEADER
+ { prism_if_print, DLT_PRISM_HEADER },
+#endif
+#ifdef DLT_IEEE802_11_RADIO
+ { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
+#endif
+#ifdef DLT_ENC
+ { enc_if_print, DLT_ENC },
#endif
{ NULL, 0 },
};
-static pcap_handler
+static if_printer
lookup_printer(int type)
{
struct printer *p;
if (type == p->type)
return p->f;
- error("unknown data link type %d", type);
+ return NULL;
/* NOTREACHED */
}
extern int opterr;
extern char *optarg;
+struct print_info {
+ if_printer printer;
+};
+
struct dump_info {
char *WFileName;
pcap_t *pd;
pcap_dumper_t *p;
};
+static void
+show_dlts_and_exit(pcap_t *pd)
+{
+ int n_dlts;
+ int *dlts = 0;
+ const char *dlt_name;
+
+ n_dlts = pcap_list_datalinks(pd, &dlts);
+ if (n_dlts < 0)
+ error("%s", pcap_geterr(pd));
+ else if (n_dlts == 0 || !dlts)
+ error("No data link types.");
+
+ (void) fprintf(stderr, "Data link types (use option -y to set):\n");
+
+ while (--n_dlts >= 0) {
+ dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
+ if (dlt_name != NULL) {
+ (void) fprintf(stderr, " %s", dlt_name);
+
+ /*
+ * OK, does tcpdump handle that type?
+ */
+ if (lookup_printer(dlts[n_dlts]) == NULL)
+ (void) fprintf(stderr, " (not supported)");
+ putchar('\n');
+ } else {
+ (void) fprintf(stderr, " DLT %d (not supported)\n",
+ dlts[n_dlts]);
+ }
+ }
+ free(dlts);
+ exit(0);
+}
+
+/*
+ * Set up flags that might or might not be supported depending on the
+ * version of libpcap we're using.
+ */
+#ifdef WIN32
+#define B_FLAG "B:"
+#define B_FLAG_USAGE " [ -B size ]"
+#else /* WIN32 */
+#define B_FLAG
+#define B_FLAG_USAGE
+#endif /* WIN32 */
+
+#ifdef HAVE_PCAP_FINDALLDEVS
+#define D_FLAG "D"
+#else
+#define D_FLAG
+#endif
+
+#ifdef HAVE_PCAP_DUMP_FLUSH
+#define U_FLAG "U"
+#else
+#define U_FLAG
+#endif
+
int
main(int argc, char **argv)
{
register int cnt, op, i;
bpf_u_int32 localnet, netmask;
register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
- pcap_handler printer;
+ pcap_handler callback;
+ int type;
struct bpf_program fcode;
#ifndef WIN32
RETSIGTYPE (*oldhandler)(int);
#endif
+ struct print_info printinfo;
struct dump_info dumpinfo;
u_char *pcap_userdata;
char ebuf[PCAP_ERRBUF_SIZE];
pcap_if_t *devpointer;
int devnum;
#endif
+ int status;
#ifdef WIN32
- DWORD dwVersion;
- DWORD dwWindowsMajorVersion;
- u_int UserBufferSize=1000000;
-#endif
-
-#ifdef WIN32
- dwVersion=GetVersion(); /* get the OS version */
- dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
- if(wsockinit()!=0) return 1;
+ u_int UserBufferSize = 1000000;
+ if(wsockinit() != 0) return 1;
#endif /* WIN32 */
cnt = -1;
opterr = 0;
while (
-#ifdef WIN32
- (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
-#else /* WIN32 */
-#ifdef HAVE_PCAP_FINDALLDEVS
- (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
-#else /* HAVE_PCAP_FINDALLDEVS */
- (op = getopt(argc, argv, "aAc:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
-#endif /* HAVE_PCAP_FINDALLDEVS */
-#endif /* WIN32 */
+ (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:nNOpqr:Rs:StT:u" U_FLAG "vw:xXy:Y")) != -1)
switch (op) {
case 'a':
- ++aflag;
+ /* compatibility for old -a */
break;
- case 'A':
- ++xflag;
- ++Xflag;
- ++Aflag;
- break;
+ case 'A':
+ ++xflag;
+ ++Xflag;
+ ++Aflag;
+ break;
#ifdef WIN32
case 'B':
return 0;
#endif /* HAVE_PCAP_FINDALLDEVS */
+ case 'L':
+ Lflag++;
+ break;
+
case 'e':
++eflag;
break;
packettype = PT_SNMP;
else if (strcasecmp(optarg, "cnfp") == 0)
packettype = PT_CNFP;
+ else if (strcasecmp(optarg, "tftp") == 0)
+ packettype = PT_TFTP;
+ else if (strcasecmp(optarg, "aodv") == 0)
+ packettype = PT_AODV;
else
error("unknown packet type `%s'", optarg);
break;
++uflag;
break;
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ case 'U':
+ ++Uflag;
+ break;
+#endif
+
case 'v':
++vflag;
break;
++Xflag;
break;
+ case 'y':
+ dlt_name = optarg;
+ dlt = pcap_datalink_name_to_val(dlt_name);
+ if (dlt < 0)
+ error("invalid data link type %s", dlt_name);
+ break;
+
#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
case 'Y':
{
/* NOTREACHED */
}
- if (aflag && nflag)
- error("-a and -n options are incompatible");
-
if (tflag > 0)
thiszone = gmt2local(0);
if (RFileName != NULL) {
+ int dlt;
+ const char *dlt_name;
+
+#ifndef WIN32
/*
- * We don't need network access, so set it back to the user id.
- * Also, this prevents the user from reading anyone's
- * trace file.
+ * We don't need network access, so relinquish any set-UID
+ * or set-GID privileges we have (if any).
+ *
+ * We do *not* want set-UID privileges when opening a
+ * trace file, as that might let the user read other
+ * people's trace files (especially if we're set-UID
+ * root).
*/
-#ifndef WIN32
setuid(getuid());
#endif /* WIN32 */
-
pd = pcap_open_offline(RFileName, ebuf);
if (pd == NULL)
error("%s", ebuf);
+ dlt = pcap_datalink(pd);
+ dlt_name = pcap_datalink_val_to_name(dlt);
+ if (dlt_name == NULL)
+ dlt_name = "???";
+ printf("reading from file %s, link-type %u (%s)\n",
+ RFileName, dlt, dlt_name);
localnet = 0;
netmask = 0;
if (fflag != 0)
error("%s", ebuf);
}
#ifdef WIN32
- PrintCapBegins(program_name,device);
+ if(IsTextUnicode(device,
+ wcslen((short*)device), // Device always ends with a double \0, so this way to determine its
+ // length should be always valid
+ NULL))
+ {
+ fprintf(stderr, "%s: listening on %ws\n", program_name, device);
+ }
+ else
+ {
+ fprintf(stderr, "%s: listening on %s\n", program_name, device);
+ }
+
+ fflush(stderr);
#endif /* WIN32 */
*ebuf = '\0';
- pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
+ pd = pcap_open_live(device, snaplen, !pflag, 10000, ebuf);
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
error("%s", pcap_geterr(pd));
}
#endif /* WIN32 */
+ if (Lflag)
+ show_dlts_and_exit(pd);
+ if (dlt >= 0) {
+#ifdef HAVE_PCAP_SET_DATALINK
+ if (pcap_set_datalink(pd, dlt) < 0)
+ error("%s", pcap_geterr(pd));
+#else
+ /*
+ * We don't actually support changing the
+ * data link type, so we only let them
+ * set it to what it already is.
+ */
+ if (dlt != pcap_datalink(pd)) {
+ error("%s is not one of the DLTs supported by this device\n",
+ dlt_name);
+ }
+#endif
+ (void)fprintf(stderr, "%s: data link type %s\n",
+ program_name, dlt_name);
+ (void)fflush(stderr);
+ }
i = pcap_snapshot(pd);
if (snaplen < i) {
warning("snaplen raised from %d to %d", snaplen, i);
}
init_addrtoname(localnet, netmask);
+#ifndef WIN32
+ (void)setsignal(SIGPIPE, cleanup);
+#endif /* WIN32 */
(void)setsignal(SIGTERM, cleanup);
(void)setsignal(SIGINT, cleanup);
/* Cooperate with nohup(1) */
if (p == NULL)
error("%s", pcap_geterr(pd));
if (Cflag != 0) {
- printer = dump_packet_and_trunc;
+ callback = dump_packet_and_trunc;
dumpinfo.WFileName = WFileName;
dumpinfo.pd = pd;
dumpinfo.p = p;
pcap_userdata = (u_char *)&dumpinfo;
} else {
- printer = dump_packet;
+ callback = dump_packet;
pcap_userdata = (u_char *)p;
}
} else {
- printer = lookup_printer(pcap_datalink(pd));
- pcap_userdata = 0;
+ type = pcap_datalink(pd);
+ printinfo.printer = lookup_printer(type);
+ if (printinfo.printer == NULL) {
+ dlt_name = pcap_datalink_val_to_name(type);
+ if (dlt_name != NULL)
+ error("unsupported data link type %s", dlt_name);
+ else
+ error("unsupported data link type %d", type);
+ }
+ callback = print_packet;
+ pcap_userdata = (u_char *)&printinfo;
}
#ifdef SIGINFO
(void)setsignal(SIGINFO, requestinfo);
#endif
#ifndef WIN32
if (RFileName == NULL) {
- (void)fprintf(stderr, "%s: listening on %s\n",
- program_name, device);
+ int dlt;
+ const char *dlt_name;
+
+ if (!vflag && !WFileName) {
+ (void)fprintf(stderr,
+ "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
+ program_name);
+ } else
+ (void)fprintf(stderr, "%s: ", program_name);
+ dlt = pcap_datalink(pd);
+ dlt_name = pcap_datalink_val_to_name(dlt);
+ if (dlt_name == NULL)
+ dlt_name = "???";
+ (void)fprintf(stderr, "listening on %s, link-type %u (%s), capture size %u bytes\n",
+ device, dlt, dlt_name, snaplen);
(void)fflush(stderr);
}
#endif /* WIN32 */
- if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
+ status = pcap_loop(pd, cnt, callback, pcap_userdata);
+ if (WFileName == NULL) {
+ /*
+ * We're printing packets. Flush the printed output,
+ * so it doesn't get intermingled with error output.
+ */
+ if (status == -2) {
+ /*
+ * We got interrupted, so perhaps we didn't
+ * manage to finish a line we were printing.
+ * Print an extra newline, just in case.
+ */
+ putchar('\n');
+ }
+ (void)fflush(stdout);
+ }
+ if (status == -1) {
+ /*
+ * Error. Report it.
+ */
(void)fprintf(stderr, "%s: pcap_loop: %s\n",
program_name, pcap_geterr(pd));
- cleanup(0);
- pcap_close(pd);
- exit(1);
}
- if (RFileName == NULL)
+ if (RFileName == NULL) {
+ /*
+ * We're doing a live capture. Report the capture
+ * statistics.
+ */
info(1);
+ }
pcap_close(pd);
- exit(0);
+ exit(status == -1 ? 1 : 0);
}
/* make a clean exit on interrupts */
static RETSIGTYPE
-cleanup(int signo)
+cleanup(int signo _U_)
{
-
- /* Can't print the summary if reading from a savefile */
+#ifdef HAVE_PCAP_BREAKLOOP
+ /*
+ * We have "pcap_breakloop()"; use it, so that we do as little
+ * as possible in the signal handler (it's probably not safe
+ * to do anything with standard I/O streams in a signal handler -
+ * the ANSI C standard doesn't say it is).
+ */
+ pcap_breakloop(pd);
+#else
+ /*
+ * We don't have "pcap_breakloop()"; this isn't safe, but
+ * it's the best we can do. Print the summary if we're
+ * not reading from a savefile - i.e., if we're doing a
+ * live capture - and exit.
+ */
if (pd != NULL && pcap_file(pd) == NULL) {
+ /*
+ * We got interrupted, so perhaps we didn't
+ * manage to finish a line we were printing.
+ * Print an extra newline, just in case.
+ */
+ putchar('\n');
(void)fflush(stdout);
- putc('\n', stderr);
info(1);
}
- if (signo)
- exit(0);
+ exit(0);
+#endif
}
-void
+static void
info(register int verbose)
{
struct pcap_stat stat;
if (!verbose)
fprintf(stderr, "%s: ", program_name);
+ (void)fprintf(stderr, "%u packets captured", packets_captured);
+ if (!verbose)
+ fputs(", ", stderr);
+ else
+ putc('\n', stderr);
(void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
if (!verbose)
fputs(", ", stderr);
static uint cnt = 2;
char *name;
+ ++packets_captured;
+
++infodelay;
dump_info = (struct dump_info *)user;
}
pcap_dump((u_char *)dump_info->p, h, sp);
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ if (Uflag)
+ pcap_dump_flush(dump_info->p);
+#endif
--infodelay;
if (infoprint)
static void
dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
{
+ ++packets_captured;
+
++infodelay;
pcap_dump(user, h, sp);
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ if (Uflag)
+ pcap_dump_flush((pcap_dumper_t *)user);
+#endif
+
+ --infodelay;
+ if (infoprint)
+ info(0);
+}
+
+static void
+print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+ struct print_info *print_info;
+ u_int hdrlen;
+
+ ++packets_captured;
+
+ ++infodelay;
+ ts_print(&h->ts);
+
+ print_info = (struct print_info *)user;
+
+ /*
+ * Some printers want to check that they're not walking off the
+ * end of the packet.
+ * Rather than pass it all the way down, we set this global.
+ */
+ snapend = sp + h->caplen;
+
+ hdrlen = (*print_info->printer)(h, sp);
+ if (xflag) {
+ /*
+ * Print the raw packet data.
+ */
+ if (xflag > 1) {
+ /*
+ * Include the link-layer header.
+ */
+ default_print_unaligned(sp, h->caplen);
+ } else {
+ /*
+ * Don't include the link-layer header - and if
+ * we have nothing past the link-layer header,
+ * print nothing.
+ */
+ if (h->caplen > hdrlen)
+ default_print_unaligned(sp + hdrlen,
+ h->caplen - hdrlen);
+ }
+ }
+
+ putchar('\n');
--infodelay;
if (infoprint)
#endif
/*
- * By default, print the packet out in hex.
+ * By default, print the specified data out in hex.
*/
void
default_print(register const u_char *bp, register u_int length)
usage(void)
{
extern char version[];
+#ifndef HAVE_PCAP_LIB_VERSION
#if defined(WIN32) || defined(HAVE_PCAP_VERSION)
extern char pcap_version[];
-#else
+#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
static char pcap_version[] = "unknown";
-#endif
+#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
+#endif /* HAVE_PCAP_LIB_VERSION */
+#ifdef HAVE_PCAP_LIB_VERSION
+ (void)fprintf(stderr, "%s version %s\n", program_name, version);
+ (void)fprintf(stderr, "%s\n", pcap_lib_version());
+#else /* HAVE_PCAP_LIB_VERSION */
#ifdef WIN32
(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
(void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
-#else
+#else /* WIN32 */
(void)fprintf(stderr, "%s version %s\n", program_name, version);
(void)fprintf(stderr, "libpcap version %s\n", pcap_version);
#endif /* WIN32 */
+#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
-#ifdef WIN32
-"Usage: %s [-aAdDeflnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name);
-#else /* WIN32 */
-#ifdef HAVE_PCAP_FINDALLDEVS
-"Usage: %s [-aAdDeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
-#else /* HAVE_PCAP_FINDALLDEVS */
-"Usage: %s [-aAdeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
-#endif /* HAVE_PCAP_FINDALLDEVS */
-#endif /* WIN32 */
+"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
+ (void)fprintf(stderr,
+"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n");
(void)fprintf(stderr,
-"\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n");
+"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n");
(void)fprintf(stderr,
-"\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n");
+"\t\t[ expression ]\n");
exit(1);
}
projects / tcpdump / blobdiff