"@(#) 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[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.226 2004-01-22 09:35:50 hannes Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
#endif
/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <limits.h>
+#ifndef WIN32
+#include <sys/wait.h>
+#include <sys/resource.h>
#include <pwd.h>
#include <grp.h>
+#include <errno.h>
+#endif /* WIN32 */
+
+#include "netdissect.h"
#include "interface.h"
#include "addrtoname.h"
#include "machdep.h"
#include "gmt2local.h"
#include "pcap-missing.h"
+#ifndef NAME_MAX
+#define NAME_MAX 255
+#endif
+
+netdissect_options Gndo;
+netdissect_options *gndo = &Gndo;
+
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 pflag; /* don't go promiscuous */
-int qflag; /* quick (shorter) output */
-int Rflag = 1; /* print sequence # field in AH/ESP*/
-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;
+char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
static int infodelay;
static int infoprint;
/* Forwards */
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 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 *);
+static void droproot(const char *, const char *);
+static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
+static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
#ifdef SIGINFO
RETSIGTYPE requestinfo(int);
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 {
{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
#endif
{ ppp_if_print, DLT_PPP },
+#ifdef DLT_PPP_WITHDIRECTION
+ { ppp_if_print, DLT_PPP_WITHDIRECTION },
+#endif
#ifdef DLT_PPP_BSDOS
{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
#endif
#ifdef DLT_LTALK
{ ltalk_if_print, DLT_LTALK },
#endif
-#ifdef DLT_PFLOG
+#if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
{ pflog_if_print, DLT_PFLOG },
#endif
#ifdef DLT_FR
#endif
#ifdef DLT_ENC
{ enc_if_print, DLT_ENC },
+#endif
+#ifdef DLT_SYMANTEC_FIREWALL
+ { symantec_if_print, DLT_SYMANTEC_FIREWALL },
+#endif
+#ifdef DLT_APPLE_IP_OVER_IEEE1394
+ { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
+#endif
+#ifdef DLT_IEEE802_11_RADIO_AVS
+ { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
+#endif
+#ifdef DLT_JUNIPER_ATM1
+ { juniper_atm1_print, DLT_JUNIPER_ATM1 },
+#endif
+#ifdef DLT_JUNIPER_ATM2
+ { juniper_atm2_print, DLT_JUNIPER_ATM2 },
+#endif
+#ifdef DLT_JUNIPER_MFR
+ { juniper_mfr_print, DLT_JUNIPER_MFR },
+#endif
+#ifdef DLT_JUNIPER_MLFR
+ { juniper_mlfr_print, DLT_JUNIPER_MLFR },
+#endif
+#ifdef DLT_JUNIPER_MLPPP
+ { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
+#endif
+#ifdef DLT_JUNIPER_PPPOE
+ { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
+#endif
+#ifdef DLT_JUNIPER_PPPOE_ATM
+ { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
+#endif
+#ifdef DLT_JUNIPER_GGSN
+ { juniper_ggsn_print, DLT_JUNIPER_GGSN },
+#endif
+#ifdef DLT_JUNIPER_ES
+ { juniper_es_print, DLT_JUNIPER_ES },
+#endif
+#ifdef DLT_JUNIPER_MONITOR
+ { juniper_monitor_print, DLT_JUNIPER_MONITOR },
+#endif
+#ifdef DLT_JUNIPER_SERVICES
+ { juniper_services_print, DLT_JUNIPER_SERVICES },
+#endif
+#ifdef DLT_JUNIPER_ETHER
+ { juniper_ether_print, DLT_JUNIPER_ETHER },
+#endif
+#ifdef DLT_JUNIPER_PPP
+ { juniper_ppp_print, DLT_JUNIPER_PPP },
+#endif
+#ifdef DLT_JUNIPER_FRELAY
+ { juniper_frelay_print, DLT_JUNIPER_FRELAY },
+#endif
+#ifdef DLT_JUNIPER_CHDLC
+ { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
+#endif
+#ifdef 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},
+#endif
+#if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX)
+ { usb_linux_print, DLT_USB_LINUX},
+#endif
+#if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX_MMAPPED)
+ { usb_linux_print, DLT_USB_LINUX_MMAPPED},
#endif
{ NULL, 0 },
};
struct dump_info {
char *WFileName;
+ char *CurrentFileName;
pcap_t *pd;
pcap_dumper_t *p;
};
* OK, does tcpdump handle that type?
*/
if (lookup_printer(dlts[n_dlts]) == NULL)
- (void) fprintf(stderr, " (not supported)");
+ (void) fprintf(stderr, " (printing not supported)");
putchar('\n');
} else {
- (void) fprintf(stderr, " DLT %d (not supported)\n",
+ (void) fprintf(stderr, " DLT %d (printing not supported)\n",
dlts[n_dlts]);
}
}
* Set up flags that might or might not be supported depending on the
* version of libpcap we're using.
*/
-#ifdef WIN32
+#if defined(HAVE_PCAP_CREATE) || defined(WIN32)
#define B_FLAG "B:"
#define B_FLAG_USAGE " [ -B size ]"
-#else /* WIN32 */
+#else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
#define B_FLAG
#define B_FLAG_USAGE
-#endif /* WIN32 */
+#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
+
+#ifdef HAVE_PCAP_CREATE
+#define I_FLAG "I"
+#else /* HAVE_PCAP_CREATE */
+#define I_FLAG
+#endif /* HAVE_PCAP_CREATE */
+
+#ifdef HAVE_PCAP_FINDALLDEVS
+#ifndef HAVE_PCAP_IF_T
+#undef HAVE_PCAP_FINDALLDEVS
+#endif
+#endif
#ifdef HAVE_PCAP_FINDALLDEVS
#define D_FLAG "D"
#define U_FLAG
#endif
-/* Drop root privileges */
-void droproot(const char *username)
+#ifndef WIN32
+/* Drop root privileges and chroot if necessary */
+static void
+droproot(const char *username, const char *chroot_dir)
{
struct passwd *pw = NULL;
+
+ if (chroot_dir && !username) {
+ fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
+ exit(1);
+ }
+
pw = getpwnam(username);
if (pw) {
- if (initgroups(pw->pw_name, 0) != 0 || setgid(pw->pw_gid) != 0 ||
- setuid(pw->pw_uid) != 0) {
- fprintf(stderr, "Couldn't change to '%.32s' uid=%d gid=%d\n", username,
- pw->pw_uid, pw->pw_gid);
+ if (chroot_dir) {
+ if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
+ fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
+ chroot_dir, pcap_strerror(errno));
+ exit(1);
+ }
+ }
+ 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",
+ username,
+ (unsigned long)pw->pw_uid,
+ (unsigned long)pw->pw_gid,
+ pcap_strerror(errno));
exit(1);
}
}
else {
- fprintf(stderr, "Couldn't find user '%.32s'\n", username);
+ fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
+ username);
exit(1);
}
}
+#endif /* WIN32 */
+
+static int
+getWflagChars(int x)
+{
+ int c = 0;
+
+ x -= 1;
+ while (x > 0) {
+ c += 1;
+ x /= 10;
+ }
+
+ return c;
+}
+
+
+static void
+MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
+{
+ char *filename = malloc(NAME_MAX + 1);
+
+ /* Process with strftime if Gflag is set. */
+ if (Gflag != 0) {
+ struct tm *local_tm;
+
+ /* Convert Gflag_time to a usable format */
+ if ((local_tm = localtime(&Gflag_time)) == NULL) {
+ error("MakeTimedFilename: localtime");
+ }
+
+ /* There's no good way to detect an error in strftime since a return
+ * value of 0 isn't necessarily failure.
+ */
+ strftime(filename, NAME_MAX, orig_name, local_tm);
+ } else {
+ strncpy(filename, orig_name, NAME_MAX);
+ }
+
+ if (cnt == 0 && max_chars == 0)
+ strncpy(buffer, filename, NAME_MAX + 1);
+ else
+ if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
+ /* Report an error if the filename is too large */
+ error("too many output files or filename is too long (> %d)", NAME_MAX);
+ free(filename);
+}
+
+static int tcpdump_printf(netdissect_options *ndo _U_,
+ const char *fmt, ...)
+{
+
+ va_list args;
+ int ret;
+
+ va_start(args, fmt);
+ ret=vfprintf(stdout, fmt, args);
+ va_end(args);
+
+ return ret;
+}
int
main(int argc, char **argv)
u_char *pcap_userdata;
char ebuf[PCAP_ERRBUF_SIZE];
char *username = NULL;
+ char *chroot_dir = NULL;
#ifdef HAVE_PCAP_FINDALLDEVS
pcap_if_t *devpointer;
int devnum;
#endif
int status;
#ifdef WIN32
- u_int UserBufferSize = 1000000;
if(wsockinit() != 0) return 1;
#endif /* WIN32 */
+ gndo->ndo_Oflag=1;
+ gndo->ndo_Rflag=1;
+ gndo->ndo_dlt=-1;
+ gndo->ndo_default_print=ndo_default_print;
+ gndo->ndo_printf=tcpdump_printf;
+ gndo->ndo_error=ndo_error;
+ gndo->ndo_warning=ndo_warning;
+ gndo->ndo_snaplen = DEFAULT_SNAPLEN;
+
cnt = -1;
device = NULL;
infile = NULL;
opterr = 0;
while (
- (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:nNOpqr:Rs:StT:u" U_FLAG "vw:xXy:YZ:")) != -1)
+ (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)
switch (op) {
case 'a':
break;
case 'A':
- ++xflag;
- ++Xflag;
++Aflag;
break;
+ case 'b':
+ ++bflag;
+ break;
-#ifdef WIN32
+#if defined(HAVE_PCAP_CREATE) || defined(WIN32)
case 'B':
- UserBufferSize = atoi(optarg)*1024;
- if (UserBufferSize < 0)
+ Bflag = atoi(optarg)*1024;
+ if (Bflag <= 0)
error("invalid packet buffer size %s", optarg);
break;
-#endif /* WIN32 */
+#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
case 'c':
cnt = atoi(optarg);
#ifndef HAVE_LIBCRYPTO
warning("crypto code not compiled in");
#endif
- espsecret = optarg;
+ gndo->ndo_espsecret = optarg;
break;
case 'f':
infile = optarg;
break;
+ case 'G':
+ Gflag = atoi(optarg);
+ if (Gflag < 0)
+ error("invalid number of seconds %s", optarg);
+
+ /* We will create one file initially. */
+ Gflag_count = 0;
+
+ /* Grab the current time for rotation use. */
+ if ((Gflag_time = time(NULL)) == (time_t)-1) {
+ error("main: can't get current time: %s",
+ pcap_strerror(errno));
+ }
+ break;
+
case 'i':
if (optarg[0] == '0' && optarg[1] == 0)
error("Invalid adapter index");
device = optarg;
break;
+#ifdef HAVE_PCAP_CREATE
+ case 'I':
+ ++Iflag;
+ break;
+#endif /* HAVE_PCAP_CREATE */
+
case 'l':
#ifdef WIN32
/*
#endif /* WIN32 */
break;
- case 'n':
- ++nflag;
- break;
-
- case 'N':
- ++Nflag;
+ case 'K':
+ ++Kflag;
break;
case 'm':
#ifdef LIBSMI
- if (smiLoadModule(optarg) == 0) {
+ if (smiLoadModule(optarg) == 0) {
error("could not load MIB module %s", optarg);
- }
+ }
sflag = 1;
#else
(void)fprintf(stderr, "%s: ignoring option `-m %s' ",
#endif
break;
+ case 'M':
+ /* TCP-MD5 shared secret */
+#ifndef HAVE_LIBCRYPTO
+ warning("crypto code not compiled in");
+#endif
+ sigsecret = optarg;
+ break;
+
+ case 'n':
+ ++nflag;
+ break;
+
+ case 'N':
+ ++Nflag;
+ break;
+
case 'O':
Oflag = 0;
break;
case 'q':
++qflag;
+ ++suppress_default_print;
break;
case 'r':
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;
}
break;
case 't':
- --tflag;
+ ++tflag;
break;
case 'T':
WFileName = optarg;
break;
+ case 'W':
+ Wflag = atoi(optarg);
+ if (Wflag < 0)
+ error("invalid number of output files %s", optarg);
+ WflagChars = getWflagChars(Wflag);
+ break;
+
case 'x':
++xflag;
+ ++suppress_default_print;
break;
case 'X':
- ++xflag;
++Xflag;
+ ++suppress_default_print;
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);
+ gndo->ndo_dltname = optarg;
+ gndo->ndo_dlt =
+ pcap_datalink_name_to_val(gndo->ndo_dltname);
+ if (gndo->ndo_dlt < 0)
+ error("invalid data link type %s", gndo->ndo_dltname);
break;
#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
}
break;
#endif
+ case 'z':
+ if (optarg) {
+ zflag = strdup(optarg);
+ } else {
+ usage();
+ /* NOTREACHED */
+ }
+ break;
+
case 'Z':
if (optarg) {
username = strdup(optarg);
/* NOTREACHED */
}
- if (tflag > 0)
+ switch (tflag) {
+
+ case 0: /* Default */
+ case 4: /* Default + Date*/
thiszone = gmt2local(0);
+ break;
+
+ case 1: /* No time stamp */
+ case 2: /* Unix timeval style */
+ case 3: /* Microseconds since previous packet */
+ case 5: /* Microseconds since first packet */
+ break;
+
+ default: /* Not supported */
+ error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
+ break;
+ }
+
+#ifdef WITH_CHROOT
+ /* if run as root, prepare for chrooting */
+ if (getuid() == 0 || geteuid() == 0) {
+ /* future extensibility for cmd-line arguments */
+ if (!chroot_dir)
+ chroot_dir = WITH_CHROOT;
+ }
+#endif
+
+#ifdef WITH_USER
+ /* if run as root, prepare for dropping root privileges */
+ if (getuid() == 0 || geteuid() == 0) {
+ /* Run with '-Z root' to restore old behaviour */
+ if (!username)
+ username = WITH_USER;
+ }
+#endif
if (RFileName != NULL) {
int dlt;
* people's trace files (especially if we're set-UID
* root).
*/
- if (username) {
- droproot(username);
- }
- else {
- if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
- fprintf(stderr, "Warning: setgid/setuid failed !\n");
- }
+ if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
+ fprintf(stderr, "Warning: setgid/setuid failed !\n");
#endif /* WIN32 */
pd = pcap_open_offline(RFileName, ebuf);
if (pd == NULL)
error("%s", ebuf);
}
#ifdef WIN32
- 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))
- {
+ if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
+ { //a Unicode string has a \0 as second byte (so strlen() is 1)
fprintf(stderr, "%s: listening on %ws\n", program_name, device);
}
else
fflush(stderr);
#endif /* WIN32 */
+#ifdef HAVE_PCAP_CREATE
+ pd = pcap_create(device, ebuf);
+ if (pd == NULL)
+ error("%s", ebuf);
+ status = pcap_set_snaplen(pd, snaplen);
+ if (status != 0)
+ error("%s: pcap_set_snaplen failed: %s",
+ device, pcap_statustostr(status));
+ status = pcap_set_promisc(pd, !pflag);
+ if (status != 0)
+ error("%s: pcap_set_promisc failed: %s",
+ device, pcap_statustostr(status));
+ if (Iflag) {
+ status = pcap_set_rfmon(pd, 1);
+ if (status != 0)
+ error("%s: pcap_set_rfmon failed: %s",
+ device, pcap_statustostr(status));
+ }
+ status = pcap_set_timeout(pd, 1000);
+ if (status != 0)
+ error("%s: pcap_set_timeout failed: %s",
+ device, pcap_statustostr(status));
+ if (Bflag != 0) {
+ status = pcap_set_buffer_size(pd, Bflag);
+ if (status != 0)
+ error("%s: pcap_set_buffer_size failed: %s",
+ device, pcap_statustostr(status));
+ }
+ status = pcap_activate(pd);
+ if (status < 0) {
+ /*
+ * pcap_activate() failed.
+ */
+ cp = pcap_geterr(pd);
+ if (status == PCAP_ERROR)
+ error("%s", cp);
+ else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
+ status == PCAP_ERROR_PERM_DENIED) &&
+ *cp != '\0')
+ error("%s: %s\n(%s)", device,
+ pcap_statustostr(status), cp);
+ else
+ error("%s: %s", device,
+ pcap_statustostr(status));
+ } else if (status > 0) {
+ /*
+ * pcap_activate() succeeded, but it's warning us
+ * of a problem it had.
+ */
+ cp = pcap_geterr(pd);
+ if (status == PCAP_WARNING)
+ warning("%s", cp);
+ else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
+ *cp != '\0')
+ warning("%s: %s\n(%s)", device,
+ pcap_statustostr(status), cp);
+ else
+ warning("%s: %s", device,
+ pcap_statustostr(status));
+ }
+#else
*ebuf = '\0';
pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
warning("%s", ebuf);
-#ifdef WIN32
- if(UserBufferSize != 1000000)
- if(pcap_setbuff(pd, UserBufferSize)==-1){
+#endif /* HAVE_PCAP_CREATE */
+ /*
+ * Let user own process after socket has been opened.
+ */
+#ifndef WIN32
+ if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
+ fprintf(stderr, "Warning: setgid/setuid failed !\n");
+#endif /* WIN32 */
+#if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
+ if(Bflag != 0)
+ if(pcap_setbuff(pd, Bflag)==-1){
error("%s", pcap_geterr(pd));
}
-#endif /* WIN32 */
+#endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
if (Lflag)
show_dlts_and_exit(pd);
- if (dlt >= 0) {
+ if (gndo->ndo_dlt >= 0) {
#ifdef HAVE_PCAP_SET_DATALINK
- if (pcap_set_datalink(pd, dlt) < 0)
+ if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
error("%s", pcap_geterr(pd));
#else
/*
* data link type, so we only let them
* set it to what it already is.
*/
- if (dlt != pcap_datalink(pd)) {
+ if (gndo->ndo_dlt != pcap_datalink(pd)) {
error("%s is not one of the DLTs supported by this device\n",
- dlt_name);
+ gndo->ndo_dltname);
}
#endif
(void)fprintf(stderr, "%s: data link type %s\n",
- program_name, dlt_name);
+ program_name, gndo->ndo_dltname);
(void)fflush(stderr);
}
i = pcap_snapshot(pd);
netmask = 0;
warning("%s", ebuf);
}
- /*
- * Let user own process after socket has been opened.
- */
-#ifndef WIN32
- if (username) {
- droproot(username);
- }
- else {
- if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
- fprintf(stderr, "Warning: setgid/setuid failed !\n");
- }
-#endif /* WIN32 */
}
if (infile)
cmdbuf = read_infile(infile);
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
error("%s", pcap_geterr(pd));
+ free(cmdbuf);
if (dflag) {
bpf_dump(&fcode, dflag);
pcap_close(pd);
exit(0);
}
init_addrtoname(localnet, netmask);
+ init_checksum();
#ifndef WIN32
(void)setsignal(SIGPIPE, cleanup);
-#endif /* WIN32 */
(void)setsignal(SIGTERM, cleanup);
(void)setsignal(SIGINT, cleanup);
+ (void)setsignal(SIGCHLD, child_cleanup);
+#endif /* WIN32 */
/* Cooperate with nohup(1) */
#ifndef WIN32
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
if (pcap_setfilter(pd, &fcode) < 0)
error("%s", pcap_geterr(pd));
if (WFileName) {
- pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
+ pcap_dumper_t *p;
+ /* Do not exceed the default NAME_MAX for files. */
+ dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
+
+ if (dumpinfo.CurrentFileName == NULL)
+ error("malloc of dumpinfo.CurrentFileName");
+
+ /* We do not need numbering for dumpfiles if Cflag isn't set. */
+ if (Cflag != 0)
+ MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
+ else
+ MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
+
+ p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
if (p == NULL)
error("%s", pcap_geterr(pd));
- if (Cflag != 0) {
+ if (Cflag != 0 || Gflag != 0) {
callback = dump_packet_and_trunc;
dumpinfo.WFileName = WFileName;
dumpinfo.pd = pd;
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);
+ 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("unsupported data link type %d", type);
+ error("packet printing is not supported for link type %d: use -w", 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
- (void)setsignal(SIGINFO, requestinfo);
+ /*
+ * We can't get statistics when reading from a file rather
+ * than capturing from a device.
+ */
+ if (RFileName == NULL)
+ (void)setsignal(SIGINFO, requestinfo);
#endif
if (vflag > 0 && WFileName) {
#endif
}
+/*
+ On windows, we do not use a fork, so we do not care less about
+ waiting a child processes to die
+ */
+#ifndef WIN32
+static RETSIGTYPE
+child_cleanup(int signo _U_)
+{
+ wait(NULL);
+}
+#endif /* WIN32 */
+
static void
info(register int verbose)
{
if (pcap_stats(pd, &stat) < 0) {
(void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
+ infoprint = 0;
return;
}
infoprint = 0;
}
+#ifndef WIN32
static void
-reverse(char *s)
+compress_savefile(const char *filename)
{
- int i, j, c;
-
- for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
- c = s[i];
- s[i] = s[j];
- s[j] = c;
- }
+ if (fork())
+ return;
+ /*
+ * Set to lowest priority so that this doesn't disturb the capture
+ */
+#ifdef NZERO
+ setpriority(PRIO_PROCESS, 0, NZERO - 1);
+#else
+ setpriority(PRIO_PROCESS, 0, 19);
+#endif
+ if (execlp(zflag, zflag, filename, NULL) == -1)
+ fprintf(stderr,
+ "compress_savefile:execlp(%s, %s): %s\n",
+ zflag,
+ filename,
+ strerror(errno));
}
-
-
+#else /* WIN32 */
static void
-swebitoa(unsigned int n, char *s)
+compress_savefile(const char *filename)
{
- unsigned int i;
-
- i = 0;
- do {
- s[i++] = n % 10 + '0';
- } while ((n /= 10) > 0);
-
- s[i] = '\0';
- reverse(s);
+ fprintf(stderr,
+ "compress_savefile failed. Functionality not implemented under windows\n");
}
+#endif /* WIN32 */
static void
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
{
struct dump_info *dump_info;
- static uint cnt = 2;
- char *name;
++packets_captured;
dump_info = (struct dump_info *)user;
+ /*
+ * XXX - this won't force the file to rotate on the specified time
+ * boundary, but it will rotate on the first packet received after the
+ * specified Gflag number of seconds. Note: if a Gflag time boundary
+ * and a Cflag size boundary coincide, the time rotation will occur
+ * first thereby cancelling the Cflag boundary (since the file should
+ * be 0).
+ */
+ if (Gflag != 0) {
+ /* Check if it is time to rotate */
+ time_t t;
+
+ /* Get the current time */
+ if ((t = time(NULL)) == (time_t)-1) {
+ error("dump_and_trunc_packet: can't get current_time: %s",
+ pcap_strerror(errno));
+ }
+
+
+ /* If the time is greater than the specified window, rotate */
+ if (t - Gflag_time >= Gflag) {
+ /* Update the Gflag_time */
+ Gflag_time = t;
+ /* Update Gflag_count */
+ Gflag_count++;
+ /*
+ * Close the current file and open a new one.
+ */
+ pcap_dump_close(dump_info->p);
+
+ /*
+ * Compress the file we just closed, if the user asked for it
+ */
+ if (zflag != NULL)
+ compress_savefile(dump_info->CurrentFileName);
+
+ /*
+ * Check to see if we've exceeded the Wflag (when
+ * not using Cflag).
+ */
+ if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
+ (void)fprintf(stderr, "Maximum file limit reached: %d\n",
+ Wflag);
+ exit(0);
+ /* NOTREACHED */
+ }
+ if (dump_info->CurrentFileName != NULL)
+ free(dump_info->CurrentFileName);
+ /* Allocate space for max filename + \0. */
+ dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
+ if (dump_info->CurrentFileName == NULL)
+ error("dump_packet_and_trunc: malloc");
+ /*
+ * This is always the first file in the Cflag
+ * rotation: e.g. 0
+ * We also don't need numbering if Cflag is not set.
+ */
+ if (Cflag != 0)
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
+ WflagChars);
+ else
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
+
+ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+ if (dump_info->p == NULL)
+ error("%s", pcap_geterr(pd));
+ }
+ }
+
/*
* XXX - this won't prevent capture files from getting
* larger than Cflag - the last packet written to the
* file could put it over Cflag.
*/
- if (ftell((FILE *)dump_info->p) > Cflag) {
- name = (char *) malloc(strlen(dump_info->WFileName) + 4);
- if (name == NULL)
- error("dump_packet_and_trunc: malloc");
- strcpy(name, dump_info->WFileName);
- swebitoa(cnt, name + strlen(dump_info->WFileName));
- cnt++;
+ if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
+ /*
+ * Close the current file and open a new one.
+ */
pcap_dump_close(dump_info->p);
- dump_info->p = pcap_dump_open(dump_info->pd, name);
- free(name);
+
+ /*
+ * Compress the file we just closed, if the user asked for it
+ */
+ if (zflag != NULL)
+ compress_savefile(dump_info->CurrentFileName);
+
+ Cflag_count++;
+ if (Wflag > 0) {
+ if (Cflag_count >= Wflag)
+ Cflag_count = 0;
+ }
+ if (dump_info->CurrentFileName != NULL)
+ free(dump_info->CurrentFileName);
+ dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
+ if (dump_info->CurrentFileName == NULL)
+ error("dump_packet_and_trunc: malloc");
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
+ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
if (dump_info->p == NULL)
error("%s", pcap_geterr(pd));
}
snapend = sp + h->caplen;
hdrlen = (*print_info->printer)(h, sp);
- if (xflag) {
+ if (Xflag) {
+ /*
+ * Print the raw packet data in hex and ASCII.
+ */
+ if (Xflag > 1) {
+ /*
+ * Include the link-layer header.
+ */
+ hex_and_ascii_print("\n\t", 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)
+ hex_and_ascii_print("\n\t", sp + hdrlen,
+ h->caplen - hdrlen);
+ }
+ } else if (xflag) {
/*
- * Print the raw packet data.
+ * Print the raw packet data in hex.
*/
if (xflag > 1) {
/*
* Include the link-layer header.
*/
- default_print(sp, h->caplen);
+ hex_print("\n\t", sp, h->caplen);
} else {
/*
* Don't include the link-layer header - and if
* print nothing.
*/
if (h->caplen > hdrlen)
- default_print(sp + hdrlen,
+ hex_print("\n\t", sp + hdrlen,
h->caplen - hdrlen);
}
+ } else if (Aflag) {
+ /*
+ * Print the raw packet data in ASCII.
+ */
+ if (Aflag > 1) {
+ /*
+ * Include the link-layer header.
+ */
+ ascii_print(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)
+ ascii_print(sp + hdrlen, h->caplen - hdrlen);
+ }
}
putchar('\n');
char version[]="current-cvs.tcpdump.org";
#endif
char pcap_version[]="current-cvs.tcpdump.org";
- char Wpcap_version[]="3.0 alpha";
+ char Wpcap_version[]="3.1";
#endif
/*
- * By default, print the specified data out in hex.
+ * By default, print the specified data out in hex and ASCII.
*/
+static void
+ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
+{
+ hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
+}
+
void
-default_print(register const u_char *bp, register u_int length)
+default_print(const u_char *bp, u_int length)
{
- ascii_print("\n\t", bp, length); /* pass on lf and identation string */
+ ndo_default_print(gndo, bp, length);
}
#ifdef SIGINFO
*/
#ifdef USE_WIN32_MM_TIMER
void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
- DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
+ DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
{
struct pcap_stat stat;
#endif /* HAVE_PCAP_LIB_VERSION */
#ifdef HAVE_PCAP_LIB_VERSION
+#ifdef WIN32
+ (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
+#else /* WIN32 */
(void)fprintf(stderr, "%s version %s\n", program_name, version);
- (void)fprintf(stderr, "%s\n", pcap_lib_version());
+#endif /* WIN32 */
+ (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);
#endif /* WIN32 */
#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
-"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
+"Usage: %s [-aAd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
(void)fprintf(stderr,
-"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n");
+"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
(void)fprintf(stderr,
-"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ] [ -Z user ]\n");
+"\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
+ (void)fprintf(stderr,
+"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
+ (void)fprintf(stderr,
+"\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
(void)fprintf(stderr,
"\t\t[ expression ]\n");
exit(1);
}
+
+
+
+/* VARARGS */
+static void
+ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
+{
+ va_list ap;
+
+ (void)fprintf(stderr, "%s: ", program_name);
+ va_start(ap, fmt);
+ (void)vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ if (*fmt) {
+ fmt += strlen(fmt);
+ if (fmt[-1] != '\n')
+ (void)fputc('\n', stderr);
+ }
+ exit(1);
+ /* NOTREACHED */
+}
+
+/* VARARGS */
+static void
+ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
+{
+ va_list ap;
+
+ (void)fprintf(stderr, "%s: WARNING: ", program_name);
+ va_start(ap, fmt);
+ (void)vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ if (*fmt) {
+ fmt += strlen(fmt);
+ if (fmt[-1] != '\n')
+ (void)fputc('\n', stderr);
+ }
+}
projects / tcpdump / blobdiff