From Albert Chin: IBM's C compiler, at least for AIX 4.3.3, doesn't

[tcpdump] / tcpdump.c

diff --git a/tcpdump.c b/tcpdump.c
index 4fec886cb823794b7841448523f122974a63da1a..9d7a8f5fd247c2102d11182692869423a9bbdd80 100644 (file)
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -30,7 +30,7 @@ static const char copyright[] _U_ =
     "@(#) 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_ =
     "@(#) 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 1.227 2004-01-22 09:51:31 hannes Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.254 2005-04-20 12:41:44 hannes Exp $ (LBL)";

 #endif
 
 /*
 #endif
 
 /*


@@ -65,9 +65,13 @@ extern int SIZE_BUF;
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

+#ifndef WIN32

 #include <pwd.h>
 #include <grp.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 "interface.h"
 #include "addrtoname.h"
 #include "machdep.h"


@@ -75,33 +79,19 @@ extern int SIZE_BUF;
 #include "gmt2local.h"
 #include "pcap-missing.h"
 
 #include "gmt2local.h"
 #include "pcap-missing.h"
 

+netdissect_options Gndo;
+netdissect_options *gndo = &Gndo;
+
+/*
+ * Define the maximum number of files for the -C flag, and how many
+ * characters can be added to a filename for the -C flag (which
+ * should be enough to handle MAX_CFLAG - 1).
+ */
+#define MAX_CFLAG      1000000
+#define MAX_CFLAG_CHARS        6
+

 int dflag;                     /* print filter code */
 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 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;

 
 static int infodelay;
 static int infoprint;
 
 static int infodelay;
 static int infoprint;


@@ -116,9 +106,12 @@ 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 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 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);
 
 #ifdef SIGINFO
 RETSIGTYPE requestinfo(int);


@@ -135,9 +128,6 @@ RETSIGTYPE requestinfo(int);
 static void info(int);
 static u_int packets_captured;
 
 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 {
 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
 
 struct printer {


@@ -166,6 +156,9 @@ static struct printer printers[] = {
        { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 #endif
        { ppp_if_print,         DLT_PPP },
        { 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_PPP_BSDOS
        { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 #endif


@@ -220,6 +213,27 @@ static struct printer printers[] = {
 #endif
 #ifdef DLT_ENC
        { enc_if_print,         DLT_ENC },
 #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_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
        { NULL,                 0 },
 };
 #endif
        { NULL,                 0 },
 };


@@ -301,6 +315,12 @@ show_dlts_and_exit(pcap_t *pd)
 #define B_FLAG_USAGE
 #endif /* WIN32 */
 
 #define B_FLAG_USAGE
 #endif /* WIN32 */
 

+#ifdef HAVE_PCAP_FINDALLDEVS
+#ifndef HAVE_PCAP_IF_T
+#undef HAVE_PCAP_FINDALLDEVS
+#endif
+#endif
+

 #ifdef HAVE_PCAP_FINDALLDEVS
 #define D_FLAG "D"
 #else
 #ifdef HAVE_PCAP_FINDALLDEVS
 #define D_FLAG "D"
 #else


@@ -313,31 +333,89 @@ show_dlts_and_exit(pcap_t *pd)
 #define U_FLAG
 #endif
 
 #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;
 {
        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) {
        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 {
                        exit(1);
                }
        }
        else {

-               fprintf(stderr, "Couldn't find user '%.32s'\n", username);
+               fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
+                   username);

                exit(1);
        }
 }
                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)
+{
+       if (cnt == 0 && max_chars == 0)
+               strcpy(buffer, orig_name);
+       else
+               sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
+}
+
+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)
 {
        register int cnt, op, i;
        bpf_u_int32 localnet, netmask;
 
 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, *WFileName, *WFileNameAlt;

        pcap_handler callback;
        int type;
        struct bpf_program fcode;
        pcap_handler callback;
        int type;
        struct bpf_program fcode;


@@ -349,6 +427,7 @@ main(int argc, char **argv)
        u_char *pcap_userdata;
        char ebuf[PCAP_ERRBUF_SIZE];
        char *username = NULL;
        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;
 #ifdef HAVE_PCAP_FINDALLDEVS
        pcap_if_t *devpointer;
        int devnum;


@@ -359,6 +438,15 @@ main(int argc, char **argv)
        if(wsockinit() != 0) return 1;
 #endif /* WIN32 */
 
        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;
        cnt = -1;
        device = NULL;
        infile = NULL;


@@ -378,7 +466,7 @@ main(int argc, char **argv)
 
        opterr = 0;
        while (
 
        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:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)

                switch (op) {
 
                case 'a':
                switch (op) {
 
                case 'a':


@@ -443,7 +531,7 @@ main(int argc, char **argv)
 #ifndef HAVE_LIBCRYPTO
                        warning("crypto code not compiled in");
 #endif
 #ifndef HAVE_LIBCRYPTO
                        warning("crypto code not compiled in");
 #endif

-                       espsecret = optarg;
+                       gndo->ndo_espsecret = optarg;

                        break;
 
                case 'f':
                        break;
 
                case 'f':


@@ -531,6 +619,14 @@ main(int argc, char **argv)
 #endif
                        break;
 
 #endif
                        break;
 

+               case 'M':
+                       /* TCP-MD5 shared secret */
+#ifndef HAVE_LIBCRYPTO
+                       warning("crypto code not compiled in");
+#endif
+                       tcpmd5secret = optarg;
+                       break;
+

                case 'O':
                        Oflag = 0;
                        break;
                case 'O':
                        Oflag = 0;
                        break;


@@ -568,7 +664,7 @@ main(int argc, char **argv)
                        break;
 
                case 't':
                        break;
 
                case 't':

-                       --tflag;
+                       ++tflag;

                        break;
 
                case 'T':
                        break;
 
                case 'T':


@@ -612,20 +708,27 @@ main(int argc, char **argv)
                        WFileName = optarg;
                        break;
 
                        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;
                        break;
 
                case 'X':
                case 'x':
                        ++xflag;
                        break;
 
                case 'X':

-                       ++xflag;

                        ++Xflag;
                        break;
 
                case 'y':
                        ++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);
+                       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;
 
 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)


@@ -657,8 +760,40 @@ main(int argc, char **argv)
                        /* NOTREACHED */
                }
 
                        /* NOTREACHED */
                }
 

-       if (tflag > 0)
+       switch (tflag) {
+
+       case 0: /* Default */
+       case 4: /* Default + Date*/

                thiszone = gmt2local(0);
                thiszone = gmt2local(0);

+               break;
+
+       case 1: /* No time stamp */
+       case 2: /* Unix timeval style */
+       case 3: /* Microseconds since previous packet */
+               break;
+
+       default: /* Not supported */
+               error("only -t, -tt, -ttt, and -tttt 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;
 
        if (RFileName != NULL) {
                int dlt;


@@ -674,13 +809,8 @@ main(int argc, char **argv)
                 * people's trace files (especially if we're set-UID
                 * root).
                 */
                 * 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)
 #endif /* WIN32 */
                pd = pcap_open_offline(RFileName, ebuf);
                if (pd == NULL)


@@ -707,11 +837,8 @@ main(int argc, char **argv)
                                error("%s", ebuf);
                }
 #ifdef WIN32
                                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
                        fprintf(stderr, "%s: listening on %ws\n", program_name, device);
                }
                else


@@ -727,6 +854,13 @@ main(int argc, char **argv)
                        error("%s", ebuf);
                else if (*ebuf)
                        warning("%s", ebuf);
                        error("%s", ebuf);
                else if (*ebuf)
                        warning("%s", ebuf);

+               /*
+                * 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 */

 #ifdef WIN32
                if(UserBufferSize != 1000000)
                        if(pcap_setbuff(pd, UserBufferSize)==-1){
 #ifdef WIN32
                if(UserBufferSize != 1000000)
                        if(pcap_setbuff(pd, UserBufferSize)==-1){


@@ -735,9 +869,9 @@ main(int argc, char **argv)
 #endif /* WIN32 */
                if (Lflag)
                        show_dlts_and_exit(pd);
 #endif /* WIN32 */
                if (Lflag)
                        show_dlts_and_exit(pd);

-               if (dlt >= 0) {
+               if (gndo->ndo_dlt >= 0) {

 #ifdef HAVE_PCAP_SET_DATALINK
 #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
                        /*
                                error("%s", pcap_geterr(pd));
 #else
                        /*


@@ -745,13 +879,13 @@ main(int argc, char **argv)
                         * data link type, so we only let them
                         * set it to what it already is.
                         */
                         * 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",
                                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",
                        }
 #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);
                        (void)fflush(stderr);
                }
                i = pcap_snapshot(pd);


@@ -764,18 +898,6 @@ main(int argc, char **argv)
                        netmask = 0;
                        warning("%s", ebuf);
                }
                        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 (infile)
                cmdbuf = read_infile(infile);


@@ -805,7 +927,13 @@ main(int argc, char **argv)
        if (pcap_setfilter(pd, &fcode) < 0)
                error("%s", pcap_geterr(pd));
        if (WFileName) {
        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;
+
+               WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
+               if (WFileNameAlt == NULL)
+                       error("malloc of WFileNameAlt");
+               MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
+               p = pcap_dump_open(pd, WFileNameAlt);

                if (p == NULL)
                        error("%s", pcap_geterr(pd));
                if (Cflag != 0) {
                if (p == NULL)
                        error("%s", pcap_geterr(pd));
                if (Cflag != 0) {


@@ -822,15 +950,26 @@ main(int argc, char **argv)
                type = pcap_datalink(pd);
                printinfo.printer = lookup_printer(type);
                if (printinfo.printer == NULL) {
                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("unsupported data link type %s",
+                                     gndo->ndo_dltname);

                        else
                                error("unsupported data link type %d", type);
                }
                callback = print_packet;
                pcap_userdata = (u_char *)&printinfo;
        }
                        else
                                error("unsupported data link type %d", 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);
 #endif
 #ifdef SIGINFO
        (void)setsignal(SIGINFO, requestinfo);
 #endif


@@ -898,16 +1037,6 @@ main(int argc, char **argv)
                (void)fprintf(stderr, "%s: pcap_loop: %s\n",
                    program_name, pcap_geterr(pd));
        }
                (void)fprintf(stderr, "%s: pcap_loop: %s\n",
                    program_name, pcap_geterr(pd));
        }

-#ifdef WITH_USER
-       /* if run as root, drop root; protect against remote sec problems */
-       if (getuid() == 0 || geteuid() == 0) {
-               /* Run with '-Z root' to restore old behaviour */ 
-               if (!username) {
-                       droproot(WITH_USER);
-                       /* does not return if fails */
-               }
-       }
-#endif

        if (RFileName == NULL) {
                /*
                 * We're doing a live capture.  Report the capture
        if (RFileName == NULL) {
                /*
                 * We're doing a live capture.  Report the capture


@@ -987,38 +1116,10 @@ info(register int verbose)
        infoprint = 0;
 }
 
        infoprint = 0;
 }
 

-static void
-reverse(char *s)
-{
-       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;
-       }
-}
-
-
-static void
-swebitoa(unsigned int n, char *s)
-{
-       unsigned int i;
-
-       i = 0;
-       do {
-               s[i++] = n % 10 + '0';
-       } while ((n /= 10) > 0);
-
-       s[i] = '\0';
-       reverse(s);
-}
-

 static void
 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 {
        struct dump_info *dump_info;
 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;
        char *name;
 
        ++packets_captured;


@@ -1033,13 +1134,22 @@ dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *s
         * file could put it over Cflag.
         */
        if (ftell((FILE *)dump_info->p) > Cflag) {
         * file could put it over Cflag.
         */
        if (ftell((FILE *)dump_info->p) > Cflag) {

-               name = (char *) malloc(strlen(dump_info->WFileName) + 4);
+               /*
+                * Close the current file and open a new one.
+                */
+               pcap_dump_close(dump_info->p);
+               Cflag_count++;
+               if (Wflag > 0) {
+                       if (Cflag_count >= Wflag)
+                               Cflag_count = 0;
+               } else {
+                       if (Cflag_count >= MAX_CFLAG)
+                               error("too many output files");
+               }
+               name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);

                if (name == NULL)
                        error("dump_packet_and_trunc: malloc");
                if (name == NULL)
                        error("dump_packet_and_trunc: malloc");

-               strcpy(name, dump_info->WFileName);
-               swebitoa(cnt, name + strlen(dump_info->WFileName));
-               cnt++;
-               pcap_dump_close(dump_info->p);
+               MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);

                dump_info->p = pcap_dump_open(dump_info->pd, name);
                free(name);
                if (dump_info->p == NULL)
                dump_info->p = pcap_dump_open(dump_info->pd, name);
                free(name);
                if (dump_info->p == NULL)


@@ -1104,7 +1214,7 @@ print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
                        /*
                         * Include the link-layer header.
                         */
                        /*
                         * 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
                } else {
                        /*
                         * Don't include the link-layer header - and if


@@ -1112,7 +1222,26 @@ print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
                         * print nothing.
                         */
                        if (h->caplen > hdrlen)
                         * print nothing.
                         */
                        if (h->caplen > hdrlen)

-                               default_print(sp + hdrlen,
+                               hex_print("\n\t", sp + hdrlen,
+                                   h->caplen - hdrlen);
+               }
+       } else if (Xflag) {
+               /*
+                * Print the raw packet data.
+                */
+               if (Xflag > 1) {
+                       /*
+                        * Include the link-layer header.
+                        */
+                       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)
+                               ascii_print("\n\t", sp + hdrlen,

                                    h->caplen - hdrlen);
                }
        }
                                    h->caplen - hdrlen);
                }
        }


@@ -1148,16 +1277,22 @@ print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
        char version[]="current-cvs.tcpdump.org";
 #endif
        char pcap_version[]="current-cvs.tcpdump.org";
        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.
  */
 #endif
 
 /*
  * By default, print the specified data out in hex.
  */

+static void
+ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
+{
+       ascii_print("\n\t", bp, length); /* pass on lf and identation string */
+}
+

 void
 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 SIGINFO


@@ -1206,8 +1341,12 @@ usage(void)
 #endif /* HAVE_PCAP_LIB_VERSION */
 
 #ifdef HAVE_PCAP_LIB_VERSION
 #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 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);
 #else /* HAVE_PCAP_LIB_VERSION */
 #ifdef WIN32
        (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);


@@ -1220,10 +1359,51 @@ usage(void)
        (void)fprintf(stderr,
 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
        (void)fprintf(stderr,
        (void)fprintf(stderr,
 "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");
+"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
+       (void)fprintf(stderr,
+"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");

        (void)fprintf(stderr,
        (void)fprintf(stderr,

-"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ] [ -Z user ]\n");
+"\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");

        (void)fprintf(stderr,
 "\t\t[ expression ]\n");
        exit(1);
 }
        (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);
+       }
+}
+