static int dflag; /* print filter code */
static int Lflag; /* list available data link types and exit */
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+static int Jflag; /* list available time stamp types */
+#endif
static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
static int infodelay;
pcap_dumper_t *p;
};
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+static void
+show_tstamp_types_and_exit(const char *device, pcap_t *pd)
+{
+ int n_tstamp_types;
+ int *tstamp_types = 0;
+ const char *tstamp_type_name;
+ int i;
+
+ n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
+ if (n_tstamp_types < 0)
+ error("%s", pcap_geterr(pd));
+
+ if (n_tstamp_types == 0) {
+ fprintf(stderr, "Time stamp type cannot be set for %s\n",
+ device);
+ exit(0);
+ }
+ fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
+ device);
+ for (i = 0; i < n_tstamp_types; i++) {
+ tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
+ if (tstamp_type_name != NULL) {
+ (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
+ pcap_tstamp_type_val_to_description(tstamp_types[i]));
+ } else {
+ (void) fprintf(stderr, " %d\n", tstamp_types[i]);
+ }
+ }
+ pcap_free_tstamp_types(tstamp_types);
+ exit(0);
+}
+#endif
+
static void
show_dlts_and_exit(const char *device, pcap_t *pd)
{
dlts[n_dlts]);
}
}
- free(dlts);
+ pcap_free_datalinks(dlts);
exit(0);
}
#define I_FLAG
#endif /* HAVE_PCAP_CREATE */
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+#define j_FLAG "j:"
+#define j_FLAG_USAGE " [ -j tstamptype ]"
+#define J_FLAG "J"
+#else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
+#define j_FLAG
+#define j_FLAG_USAGE
+#define J_FLAG
+#endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
+
#ifdef HAVE_PCAP_FINDALLDEVS
#ifndef HAVE_PCAP_IF_T
#undef HAVE_PCAP_FINDALLDEVS
if(wsockinit() != 0) return 1;
#endif /* WIN32 */
+ jflag=-1; /* not set */
gndo->ndo_Oflag=1;
gndo->ndo_Rflag=1;
gndo->ndo_dlt=-1;
opterr = 0;
while (
- (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
+ (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
switch (op) {
case 'a':
}
break;
+ case 'h':
+ ++hflag;
+ break;
+
case 'i':
if (optarg[0] == '0' && optarg[1] == 0)
error("Invalid adapter index");
break;
#endif /* HAVE_PCAP_CREATE */
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+ case 'j':
+ jflag = pcap_tstamp_type_name_to_val(optarg);
+ if (jflag < 0)
+ error("invalid time stamp type %s", optarg);
+ break;
+
+ case 'J':
+ Jflag++;
+ break;
+#endif
+
case 'l':
#ifdef WIN32
/*
pd = pcap_create(device, ebuf);
if (pd == NULL)
error("%s", ebuf);
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+ if (Jflag)
+ show_tstamp_types_and_exit(device, pd);
+#endif
/*
* Is this an interface that supports monitor mode?
*/
supports_monitor_mode = 0;
status = pcap_set_snaplen(pd, snaplen);
if (status != 0)
- error("%s: pcap_set_snaplen failed: %s",
+ error("%s: Can't set snapshot length: %s",
device, pcap_statustostr(status));
status = pcap_set_promisc(pd, !pflag);
if (status != 0)
- error("%s: pcap_set_promisc failed: %s",
+ error("%s: Can't set promiscuous mode: %s",
device, pcap_statustostr(status));
if (Iflag) {
status = pcap_set_rfmon(pd, 1);
if (status != 0)
- error("%s: pcap_set_rfmon failed: %s",
+ error("%s: Can't set monitor mode: %s",
device, pcap_statustostr(status));
}
status = pcap_set_timeout(pd, 1000);
if (Bflag != 0) {
status = pcap_set_buffer_size(pd, Bflag);
if (status != 0)
- error("%s: pcap_set_buffer_size failed: %s",
+ error("%s: Can't set buffer size: %s",
device, pcap_statustostr(status));
}
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+ if (jflag != -1) {
+ status = pcap_set_tstamp_type(pd, jflag);
+ if (status < 0)
+ error("%s: Can't set time stamp type: %s",
+ device, pcap_statustostr(status));
+ }
+#endif
status = pcap_activate(pd);
if (status < 0) {
/*
(void)setsignal(SIGHUP, oldhandler);
#endif /* WIN32 */
+#ifndef WIN32
+ /*
+ * If a user name was specified with "-Z", attempt to switch to
+ * that user's UID. This would probably be used with sudo,
+ * to allow tcpdump to be run in a special restricted
+ * account (if you just want to allow users to open capture
+ * devices, and can't just give users that permission,
+ * you'd make tcpdump set-UID or set-GID).
+ *
+ * Tcpdump doesn't necessarily write only to one savefile;
+ * the general only way to allow a -Z instance to write to
+ * savefiles as the user under whose UID it's run, rather
+ * than as the user specified with -Z, would thus be to switch
+ * to the original user ID before opening a capture file and
+ * then switch back to the -Z user ID after opening the savefile.
+ * Switching to the -Z user ID only after opening the first
+ * savefile doesn't handle the general case.
+ */
+ if (getuid() == 0 || geteuid() == 0) {
+ if (username || chroot_dir)
+ droproot(username, chroot_dir);
+ }
+#endif /* WIN32 */
+
if (pcap_setfilter(pd, &fcode) < 0)
error("%s", pcap_geterr(pd));
if (WFileName) {
callback = dump_packet;
pcap_userdata = (u_char *)p;
}
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ if (Uflag)
+ pcap_dump_flush(p);
+#endif
} else {
type = pcap_datalink(pd);
printinfo.ndo_type = 1;
callback = print_packet;
pcap_userdata = (u_char *)&printinfo;
}
-#ifndef WIN32
- /*
- * We cannot do this earlier, because we want to be able to open
- * the file (if done) for writing before giving up permissions.
- */
- if (getuid() == 0 || geteuid() == 0) {
- if (username || chroot_dir)
- droproot(username, chroot_dir);
- }
-#endif /* WIN32 */
+
#ifdef SIGINFO
/*
* We can't get statistics when reading from a file rather
#endif /* WIN32 */
#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
-"Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
+"Usage: %s [-aAbd" D_FLAG "efh" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
(void)fprintf(stderr,
"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
(void)fprintf(stderr,
-"\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
+"\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
(void)fprintf(stderr,
-"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
+"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
(void)fprintf(stderr,
-"\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
+"\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
(void)fprintf(stderr,
-"\t\t[ expression ]\n");
+"\t\t[ -Z user ] [ expression ]\n");
exit(1);
}
projects / tcpdump / blobdiff