#include <errno.h>
#endif /* WIN32 */
+/* capabilities convinience library */
+#ifdef HAVE_CAP_NG_H
+#include <cap-ng.h>
+#endif /* HAVE_CAP_NG_H */
#include "netdissect.h"
#include "interface.h"
#define NAME_MAX 255
#endif
+#ifdef SIGINFO
+#define SIGNAL_REQ_INFO SIGINFO
+#elif SIGUSR1
+#define SIGNAL_REQ_INFO SIGUSR1
+#endif
+
netdissect_options Gndo;
netdissect_options *gndo = &Gndo;
-int dflag; /* print filter code */
-int Lflag; /* list available data link types and exit */
-char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
+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;
static int infoprint;
static RETSIGTYPE cleanup(int);
static RETSIGTYPE child_cleanup(int);
static void usage(void) __attribute__((noreturn));
-static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
+static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
static void ndo_default_print(netdissect_options *, const u_char *, u_int);
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 *);
static void droproot(const char *, const char *);
-static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
+static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
+ __attribute__ ((noreturn, format (printf, 2, 3)));
static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
-#ifdef SIGINFO
+#ifdef SIGNAL_REQ_INFO
RETSIGTYPE requestinfo(int);
#endif
static void info(int);
static u_int packets_captured;
-typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
-
struct printer {
- if_printer f;
+ if_printer f;
int type;
};
+
+struct ndo_printer {
+ if_ndo_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
{ lane_if_print, DLT_LANE8023 },
{ cip_if_print, DLT_CIP },
#endif
#ifdef DLT_ATM_CLIP
- { cip_if_print, DLT_ATM_CLIP },
+ { cip_if_print, DLT_ATM_CLIP },
#endif
{ sl_if_print, DLT_SLIP },
#ifdef DLT_SLIP_BSDOS
{ chdlc_if_print, DLT_HDLC },
#endif
#ifdef DLT_PPP_SERIAL
- { ppp_hdlc_if_print, DLT_PPP_SERIAL },
+ { ppp_hdlc_if_print, DLT_PPP_SERIAL },
#endif
#ifdef DLT_PPP_ETHER
{ pppoe_if_print, DLT_PPP_ETHER },
{ ltalk_if_print, DLT_LTALK },
#endif
#if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
- { pflog_if_print, DLT_PFLOG },
+ { pflog_if_print, DLT_PFLOG },
#endif
#ifdef DLT_FR
{ fr_if_print, DLT_FR },
{ ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
#endif
#ifdef DLT_ENC
- { enc_if_print, DLT_ENC },
+ { enc_if_print, DLT_ENC },
#endif
#ifdef DLT_SYMANTEC_FIREWALL
- { symantec_if_print, DLT_SYMANTEC_FIREWALL },
+ { symantec_if_print, DLT_SYMANTEC_FIREWALL },
#endif
#ifdef DLT_APPLE_IP_OVER_IEEE1394
{ ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
{ juniper_services_print, DLT_JUNIPER_SERVICES },
#endif
#ifdef DLT_JUNIPER_ETHER
- { juniper_ether_print, DLT_JUNIPER_ETHER },
+ { juniper_ether_print, DLT_JUNIPER_ETHER },
#endif
#ifdef DLT_JUNIPER_PPP
- { juniper_ppp_print, DLT_JUNIPER_PPP },
+ { juniper_ppp_print, DLT_JUNIPER_PPP },
#endif
#ifdef DLT_JUNIPER_FRELAY
- { juniper_frelay_print, DLT_JUNIPER_FRELAY },
+ { juniper_frelay_print, DLT_JUNIPER_FRELAY },
#endif
#ifdef DLT_JUNIPER_CHDLC
- { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
+ { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
#endif
#ifdef DLT_MFR
- { mfr_if_print, DLT_MFR },
+ { mfr_if_print, DLT_MFR },
#endif
#if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
- { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
+ { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
+#endif
+#ifdef HAVE_PCAP_USB_H
+#ifdef DLT_USB_LINUX
+ { usb_linux_48_byte_print, DLT_USB_LINUX},
+#endif /* DLT_USB_LINUX */
+#ifdef DLT_USB_LINUX_MMAPPED
+ { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
+#endif /* DLT_USB_LINUX_MMAPPED */
+#endif /* HAVE_PCAP_USB_H */
+#ifdef DLT_IPV4
+ { raw_if_print, DLT_IPV4 },
+#endif
+#ifdef DLT_IPV6
+ { raw_if_print, DLT_IPV6 },
+#endif
+ { NULL, 0 },
+};
+
+static struct ndo_printer ndo_printers[] = {
+ { ether_if_print, DLT_EN10MB },
+#ifdef DLT_IPNET
+ { ipnet_if_print, DLT_IPNET },
+#endif
+#ifdef DLT_IEEE802_15_4
+ { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
+#endif
+#ifdef DLT_IEEE802_15_4_NOFCS
+ { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
+#endif
+#ifdef DLT_PPI
+ { ppi_if_print, DLT_PPI },
+#endif
+#ifdef DLT_NETANALYZER
+ { netanalyzer_if_print, DLT_NETANALYZER },
+#endif
+#ifdef DLT_NETANALYZER_TRANSPARENT
+ { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
#endif
{ NULL, 0 },
};
-static if_printer
+if_printer
lookup_printer(int type)
{
struct printer *p;
/* NOTREACHED */
}
+if_ndo_printer
+lookup_ndo_printer(int type)
+{
+ struct ndo_printer *p;
+
+ for (p = ndo_printers; p->f; ++p)
+ if (type == p->type)
+ return p->f;
+
+ return NULL;
+ /* NOTREACHED */
+}
+
static pcap_t *pd;
+static int supports_monitor_mode;
+
extern int optind;
extern int opterr;
extern char *optarg;
struct print_info {
- if_printer printer;
+ netdissect_options *ndo;
+ union {
+ if_printer printer;
+ if_ndo_printer ndo_printer;
+ } p;
+ int ndo_type;
};
struct dump_info {
pcap_dumper_t *p;
};
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
static void
-show_dlts_and_exit(pcap_t *pd)
+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)
{
int n_dlts;
int *dlts = 0;
else if (n_dlts == 0 || !dlts)
error("No data link types.");
- (void) fprintf(stderr, "Data link types (use option -y to set):\n");
+ /*
+ * If the interface is known to support monitor mode, indicate
+ * whether these are the data link types available when not in
+ * monitor mode, if -I wasn't specified, or when in monitor mode,
+ * when -I was specified (the link-layer types available in
+ * monitor mode might be different from the ones available when
+ * not in monitor mode).
+ */
+ if (supports_monitor_mode)
+ (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
+ device,
+ Iflag ? "when in monitor mode" : "when not in monitor mode");
+ else
+ (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
+ device);
while (--n_dlts >= 0) {
dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
/*
* OK, does tcpdump handle that type?
*/
- if (lookup_printer(dlts[n_dlts]) == NULL)
+ if (lookup_printer(dlts[n_dlts]) == NULL
+ && lookup_ndo_printer(dlts[n_dlts]) == NULL)
(void) fprintf(stderr, " (printing not supported)");
- putchar('\n');
+ fprintf(stderr, "\n");
} else {
(void) fprintf(stderr, " DLT %d (printing not supported)\n",
dlts[n_dlts]);
}
}
- free(dlts);
+#ifdef HAVE_PCAP_FREE_DATALINKS
+ pcap_free_datalinks(dlts);
+#endif
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
exit(1);
}
}
+#ifdef HAVE_CAP_NG_H
+ int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
+ if (ret < 0) {
+ printf("error : ret %d\n", ret);
+ }
+ /* We don't need CAP_SETUID and CAP_SETGID */
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
+ capng_apply(CAPNG_SELECT_BOTH);
+
+#else
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
pcap_strerror(errno));
exit(1);
}
+#endif /* HAVE_CAP_NG_H */
}
else {
fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
return ret;
}
+struct print_info get_print_info(int type) {
+ struct print_info printinfo;
+
+ printinfo.ndo_type = 1;
+ printinfo.ndo = gndo;
+ printinfo.p.ndo_printer = lookup_ndo_printer(type);
+ if (printinfo.p.ndo_printer == NULL) {
+ printinfo.p.printer = lookup_printer(type);
+ printinfo.ndo_type = 0;
+ if (printinfo.p.printer == NULL) {
+ gndo->ndo_dltname = pcap_datalink_val_to_name(type);
+ if (gndo->ndo_dltname != NULL)
+ error("packet printing is not supported for link type %s: use -w",
+ gndo->ndo_dltname);
+ else
+ error("packet printing is not supported for link type %d: use -w", type);
+ }
+ }
+ return (printinfo);
+}
+
+char *get_next_file(FILE *VFile, char *ptr) {
+ char *ret;
+
+ ret = fgets(ptr, NAME_MAX, VFile);
+ if (!ret)
+ return NULL;
+
+ if (ptr[strlen(ptr) - 1] == '\n')
+ ptr[strlen(ptr) - 1] = '\0';
+
+ return ret;
+}
+
int
main(int argc, char **argv)
{
register int cnt, op, i;
bpf_u_int32 localnet, netmask;
- register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
+ register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
pcap_handler callback;
int type;
+ int dlt;
+ int new_dlt;
+ const char *dlt_name;
struct bpf_program fcode;
#ifndef WIN32
RETSIGTYPE (*oldhandler)(int);
struct dump_info dumpinfo;
u_char *pcap_userdata;
char ebuf[PCAP_ERRBUF_SIZE];
+ char VFileLine[NAME_MAX + 1];
char *username = NULL;
char *chroot_dir = NULL;
+ char *ret = NULL;
#ifdef HAVE_PCAP_FINDALLDEVS
pcap_if_t *devpointer;
int devnum;
#endif
int status;
+ FILE *VFile;
#ifdef WIN32
if(wsockinit() != 0) return 1;
#endif /* WIN32 */
+ jflag=-1; /* not set */
gndo->ndo_Oflag=1;
gndo->ndo_Rflag=1;
gndo->ndo_dlt=-1;
device = NULL;
infile = NULL;
RFileName = NULL;
+ VFileName = NULL;
WFileName = NULL;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
smiInit("tcpdump");
#endif
- opterr = 0;
while (
- (op = getopt(argc, argv, "aA" 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:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
switch (op) {
case 'a':
case 'A':
++Aflag;
break;
+
case 'b':
++bflag;
break;
}
break;
+ case 'h':
+ usage();
+ break;
+
+ case 'H':
+ ++Hflag;
+ break;
+
case 'i':
if (optarg[0] == '0' && optarg[1] == 0)
error("Invalid adapter index");
if (pcap_findalldevs(&devpointer, ebuf) < 0)
error("%s", ebuf);
else {
- for (i = 0; i < devnum-1; i++){
- devpointer = devpointer->next;
- if (devpointer == NULL)
- error("Invalid adapter index");
- }
+ /*
+ * Look for the devnum-th entry
+ * in the list of devices
+ * (1-based).
+ */
+ for (i = 0;
+ i < devnum-1 && devpointer != NULL;
+ i++, devpointer = devpointer->next)
+ ;
+ if (devpointer == NULL)
+ error("Invalid adapter index");
}
device = devpointer->name;
break;
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
/*
snaplen = strtol(optarg, &end, 0);
if (optarg == end || *end != '\0'
- || snaplen < 0 || snaplen > 65535)
+ || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
error("invalid snaplen %s", optarg);
else if (snaplen == 0)
- snaplen = 65535;
+ snaplen = MAXIMUM_SNAPLEN;
break;
}
packettype = PT_TFTP;
else if (strcasecmp(optarg, "aodv") == 0)
packettype = PT_AODV;
+ else if (strcasecmp(optarg, "carp") == 0)
+ packettype = PT_CARP;
+ else if (strcasecmp(optarg, "radius") == 0)
+ packettype = PT_RADIUS;
else
error("unknown packet type `%s'", optarg);
break;
++vflag;
break;
+ case 'V':
+ VFileName = optarg;
+ break;
+
case 'w':
WFileName = optarg;
break;
break;
}
+ if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
+ error("-f can not be used with -V or -r");
+
+ if (VFileName != NULL && RFileName != NULL)
+ error("-V and -r are mutually exclusive.");
+
#ifdef WITH_CHROOT
/* if run as root, prepare for chrooting */
if (getuid() == 0 || geteuid() == 0) {
}
#endif
- if (RFileName != NULL) {
- int dlt;
- const char *dlt_name;
-
+ if (RFileName != NULL || VFileName != NULL) {
#ifndef WIN32
/*
* We don't need network access, so relinquish any set-UID
if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
fprintf(stderr, "Warning: setgid/setuid failed !\n");
#endif /* WIN32 */
+ if (VFileName != NULL) {
+ if (VFileName[0] == '-' && VFileName[1] == '\0')
+ VFile = stdin;
+ else
+ VFile = fopen(VFileName, "r");
+
+ if (VFile == NULL)
+ error("Unable to open file: %s\n", strerror(errno));
+
+ ret = get_next_file(VFile, VFileLine);
+ if (!ret)
+ error("Nothing in %s\n", VFileName);
+ RFileName = VFileLine;
+ }
+
pd = pcap_open_offline(RFileName, ebuf);
if (pd == NULL)
error("%s", ebuf);
}
localnet = 0;
netmask = 0;
- if (fflag != 0)
- error("-f and -r options are incompatible");
} else {
if (device == NULL) {
device = pcap_lookupdev(ebuf);
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?
+ */
+ if (pcap_can_set_rfmon(pd) == 1)
+ supports_monitor_mode = 1;
+ else
+ 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) {
/*
}
#endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
if (Lflag)
- show_dlts_and_exit(pd);
+ show_dlts_and_exit(device, pd);
if (gndo->ndo_dlt >= 0) {
#ifdef HAVE_PCAP_SET_DATALINK
if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
if (dflag) {
bpf_dump(&fcode, dflag);
pcap_close(pd);
+ free(cmdbuf);
exit(0);
}
init_addrtoname(localnet, netmask);
(void)setsignal(SIGPIPE, cleanup);
(void)setsignal(SIGTERM, cleanup);
(void)setsignal(SIGINT, cleanup);
- (void)setsignal(SIGCHLD, child_cleanup);
#endif /* WIN32 */
+#if defined(HAVE_FORK) || defined(HAVE_VFORK)
+ (void)setsignal(SIGCHLD, child_cleanup);
+#endif
/* Cooperate with nohup(1) */
#ifndef WIN32
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
(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.
+ */
+
+#ifdef HAVE_CAP_NG_H
+ /* We are running as root and we will be writing to savefile */
+ if ((getuid() == 0 || geteuid() == 0) && WFileName) {
+ if (username) {
+ /* Drop all capabilities from effective set */
+ capng_clear(CAPNG_EFFECTIVE);
+ /* Add capabilities we will need*/
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
+
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+
+ capng_apply(CAPNG_SELECT_BOTH);
+ }
+ }
+#endif /* HAVE_CAP_NG_H */
+
+ 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) {
MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
+#ifdef HAVE_CAP_NG_H
+ /* Give up capabilities, clear Effective set */
+ capng_clear(CAPNG_EFFECTIVE);
+#endif
if (p == NULL)
error("%s", pcap_geterr(pd));
if (Cflag != 0 || Gflag != 0) {
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.printer = lookup_printer(type);
- if (printinfo.printer == NULL) {
- gndo->ndo_dltname = pcap_datalink_val_to_name(type);
- if (gndo->ndo_dltname != NULL)
- error("unsupported data link type %s",
- gndo->ndo_dltname);
- else
- error("unsupported data link type %d", type);
- }
+ printinfo = get_print_info(type);
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
+
+#ifdef SIGNAL_REQ_INFO
/*
* We can't get statistics when reading from a file rather
* than capturing from a device.
*/
if (RFileName == NULL)
- (void)setsignal(SIGINFO, requestinfo);
+ (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
#endif
if (vflag > 0 && WFileName) {
#ifndef WIN32
if (RFileName == NULL) {
- 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",
(void)fflush(stderr);
}
#endif /* WIN32 */
- 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) {
+ do {
+ status = pcap_loop(pd, cnt, callback, pcap_userdata);
+ if (WFileName == NULL) {
/*
- * We got interrupted, so perhaps we didn't
- * manage to finish a line we were printing.
- * Print an extra newline, just in case.
+ * We're printing packets. Flush the printed output,
+ * so it doesn't get intermingled with error output.
*/
- putchar('\n');
+ 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));
+ }
+ if (RFileName == NULL) {
+ /*
+ * We're doing a live capture. Report the capture
+ * statistics.
+ */
+ info(1);
+ }
+ pcap_close(pd);
+ if (VFileName != NULL) {
+ ret = get_next_file(VFile, VFileLine);
+ if (ret) {
+ RFileName = VFileLine;
+ pd = pcap_open_offline(RFileName, ebuf);
+ if (pd == NULL)
+ error("%s", ebuf);
+ new_dlt = pcap_datalink(pd);
+ if (WFileName && new_dlt != dlt)
+ error("%s: new dlt does not match original", RFileName);
+ printinfo = get_print_info(new_dlt);
+ dlt_name = pcap_datalink_val_to_name(new_dlt);
+ if (dlt_name == NULL) {
+ fprintf(stderr, "reading from file %s, link-type %u\n",
+ RFileName, new_dlt);
+ } else {
+ fprintf(stderr,
+ "reading from file %s, link-type %s (%s)\n",
+ RFileName, dlt_name,
+ pcap_datalink_val_to_description(new_dlt));
+ }
+ if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
+ error("%s", pcap_geterr(pd));
+ if (pcap_setfilter(pd, &fcode) < 0)
+ error("%s", pcap_geterr(pd));
+ }
}
- (void)fflush(stdout);
- }
- if (status == -1) {
- /*
- * Error. Report it.
- */
- (void)fprintf(stderr, "%s: pcap_loop: %s\n",
- program_name, pcap_geterr(pd));
- }
- if (RFileName == NULL) {
- /*
- * We're doing a live capture. Report the capture
- * statistics.
- */
- info(1);
}
- pcap_close(pd);
+ while (ret != NULL);
+
+ free(cmdbuf);
exit(status == -1 ? 1 : 0);
}
On windows, we do not use a fork, so we do not care less about
waiting a child processes to die
*/
-#ifndef WIN32
+#if defined(HAVE_FORK) || defined(HAVE_VFORK)
static RETSIGTYPE
child_cleanup(int signo _U_)
{
wait(NULL);
}
-#endif /* WIN32 */
+#endif /* HAVE_FORK && HAVE_VFORK */
static void
info(register int verbose)
{
struct pcap_stat stat;
+ /*
+ * Older versions of libpcap didn't set ps_ifdrop on some
+ * platforms; initialize it to 0 to handle that.
+ */
+ stat.ps_ifdrop = 0;
if (pcap_stats(pd, &stat) < 0) {
(void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
infoprint = 0;
if (!verbose)
fprintf(stderr, "%s: ", program_name);
- (void)fprintf(stderr, "%u packets captured", packets_captured);
+ (void)fprintf(stderr, "%u packet%s captured", packets_captured,
+ PLURAL_SUFFIX(packets_captured));
if (!verbose)
fputs(", ", stderr);
else
putc('\n', stderr);
- (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
+ (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
+ PLURAL_SUFFIX(stat.ps_recv));
if (!verbose)
fputs(", ", stderr);
else
putc('\n', stderr);
- (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
+ (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
+ PLURAL_SUFFIX(stat.ps_drop));
+ if (stat.ps_ifdrop != 0) {
+ if (!verbose)
+ fputs(", ", stderr);
+ else
+ putc('\n', stderr);
+ (void)fprintf(stderr, "%u packet%s dropped by interface\n",
+ stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
+ } else
+ putc('\n', stderr);
infoprint = 0;
}
-#ifndef WIN32
+#if defined(HAVE_FORK) || defined(HAVE_VFORK)
static void
compress_savefile(const char *filename)
{
+# ifdef HAVE_FORK
if (fork())
+# else
+ if (vfork())
+# endif
return;
/*
* Set to lowest priority so that this doesn't disturb the capture
#else
setpriority(PRIO_PROCESS, 0, 19);
#endif
- if (execlp(zflag, zflag, filename, NULL) == -1)
+ if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
fprintf(stderr,
"compress_savefile:execlp(%s, %s): %s\n",
zflag,
filename,
strerror(errno));
+# ifdef HAVE_FORK
+ exit(1);
+# else
+ _exit(1);
+# endif
}
-#else /* WIN32 */
+#else /* HAVE_FORK && HAVE_VFORK */
static void
compress_savefile(const char *filename)
{
fprintf(stderr,
- "compress_savefile failed. Functionality not implemented under windows\n");
+ "compress_savefile failed. Functionality not implemented under your system\n");
}
-#endif /* WIN32 */
+#endif /* HAVE_FORK && HAVE_VFORK */
static void
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
else
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
+#ifdef HAVE_CAP_NG_H
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_EFFECTIVE);
+#endif /* HAVE_CAP_NG_H */
dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+#ifdef HAVE_CAP_NG_H
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_EFFECTIVE);
+#endif /* HAVE_CAP_NG_H */
if (dump_info->p == NULL)
error("%s", pcap_geterr(pd));
}
*/
snapend = sp + h->caplen;
- hdrlen = (*print_info->printer)(h, sp);
+ if(print_info->ndo_type) {
+ hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
+ } else {
+ hdrlen = (*print_info->p.printer)(h, sp);
+ }
+
if (Xflag) {
/*
* Print the raw packet data in hex and ASCII.
ndo_default_print(gndo, bp, length);
}
-#ifdef SIGINFO
+#ifdef SIGNAL_REQ_INFO
RETSIGTYPE requestinfo(int signo _U_)
{
if (infodelay)
#endif /* WIN32 */
#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
-"Usage: %s [-aAd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
+"Usage: %s [-aAbd" D_FLAG "efhH" 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 ] [ -V file ] [ -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