/* $NetBSD: tcpdump.c,v 1.7 2004/09/27 23:04:25 dyoung Exp $ */ /* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Support for splitting captures into multiple files with a maximum * file size: * * Copyright (c) 2001 * Seth Webster */ #include #ifndef lint #if 0 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_ = "@(#) Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.216.2.10 2004/03/17 19:47:48 guy Exp (LBL)"; #else __RCSID("$NetBSD: tcpdump.c,v 1.7 2004/09/27 23:04:25 dyoung Exp $"); #endif #endif /* * tcpdump - monitor tcp/ip traffic on an ethernet. * * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory. * Mercilessly hacked and occasionally improved since then via the * combined efforts of Van, Steve McCanne and Craig Leres of LBL. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #ifdef WIN32 #include "getopt.h" #include "w32_fzs.h" extern int strcasecmp (const char *__s1, const char *__s2); extern int SIZE_BUF; #define off_t long #define uint UINT #endif /* WIN32 */ #include #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "machdep.h" #include "setsignal.h" #include "gmt2local.h" #include "pcap-missing.h" 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; static int infodelay; static int infoprint; char *program_name; int32_t thiszone; /* seconds offset from gmt to local time */ /* Forwards */ static RETSIGTYPE cleanup(int); static void usage(void) __attribute__((noreturn)); static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn)); static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *); static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *); static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *); #ifdef SIGINFO RETSIGTYPE requestinfo(int); #endif static void info(int); static u_int packets_captured; /* Length of saved portion of packet. */ int snaplen = DEFAULT_SNAPLEN; typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *); struct printer { if_printer f; int type; }; static struct printer printers[] = { { arcnet_if_print, DLT_ARCNET }, #ifdef DLT_ARCNET_LINUX { arcnet_linux_if_print, DLT_ARCNET_LINUX }, #endif { ether_if_print, DLT_EN10MB }, { token_if_print, DLT_IEEE802 }, #ifdef DLT_LANE8023 { lane_if_print, DLT_LANE8023 }, #endif #ifdef DLT_CIP { cip_if_print, DLT_CIP }, #endif #ifdef DLT_ATM_CLIP { cip_if_print, DLT_ATM_CLIP }, #endif { sl_if_print, DLT_SLIP }, #ifdef DLT_SLIP_BSDOS { sl_bsdos_if_print, DLT_SLIP_BSDOS }, #endif { ppp_if_print, DLT_PPP }, #ifdef DLT_PPP_BSDOS { ppp_bsdos_if_print, DLT_PPP_BSDOS }, #endif { fddi_if_print, DLT_FDDI }, { null_if_print, DLT_NULL }, #ifdef DLT_LOOP { null_if_print, DLT_LOOP }, #endif { raw_if_print, DLT_RAW }, { atm_if_print, DLT_ATM_RFC1483 }, #ifdef DLT_C_HDLC { chdlc_if_print, DLT_C_HDLC }, #endif #ifdef DLT_HDLC { chdlc_if_print, DLT_HDLC }, #endif #ifdef DLT_PPP_SERIAL { ppp_hdlc_if_print, DLT_PPP_SERIAL }, #endif #ifdef DLT_PPP_ETHER { pppoe_if_print, DLT_PPP_ETHER }, #endif #ifdef DLT_LINUX_SLL { sll_if_print, DLT_LINUX_SLL }, #endif #ifdef DLT_IEEE802_11 { ieee802_11_if_print, DLT_IEEE802_11}, #endif #ifdef DLT_LTALK { ltalk_if_print, DLT_LTALK }, #endif #ifdef DLT_PFLOG { pflog_if_print, DLT_PFLOG }, #endif #ifdef DLT_FR { fr_if_print, DLT_FR }, #endif #ifdef DLT_FRELAY { fr_if_print, DLT_FRELAY }, #endif #ifdef DLT_SUNATM { sunatm_if_print, DLT_SUNATM }, #endif #ifdef DLT_IP_OVER_FC { ipfc_if_print, DLT_IP_OVER_FC }, #endif #ifdef DLT_PRISM_HEADER { prism_if_print, DLT_PRISM_HEADER }, #endif #ifdef DLT_IEEE802_11_RADIO { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO }, #endif #ifdef DLT_ENC { enc_if_print, DLT_ENC }, #endif #ifdef DLT_APPLE_IP_OVER_IEEE1394 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 }, #endif { NULL, 0 }, }; static if_printer lookup_printer(int type) { struct printer *p; for (p = printers; p->f; ++p) if (type == p->type) return p->f; return NULL; /* NOTREACHED */ } static pcap_t *pd; extern int optind; extern int opterr; extern char *optarg; struct print_info { if_printer printer; }; struct dump_info { char *WFileName; pcap_t *pd; pcap_dumper_t *p; }; static void show_dlts_and_exit(pcap_t *pd) { int n_dlts; int *dlts = 0; const char *dlt_name; n_dlts = pcap_list_datalinks(pd, &dlts); if (n_dlts < 0) error("%s", pcap_geterr(pd)); else if (n_dlts == 0 || !dlts) error("No data link types."); (void) fprintf(stderr, "Data link types (use option -y to set):\n"); while (--n_dlts >= 0) { dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]); if (dlt_name != NULL) { (void) fprintf(stderr, " %s (%s)", dlt_name, pcap_datalink_val_to_description(dlts[n_dlts])); /* * OK, does tcpdump handle that type? */ if (lookup_printer(dlts[n_dlts]) == NULL) (void) fprintf(stderr, " (not supported)"); putchar('\n'); } else { (void) fprintf(stderr, " DLT %d (not supported)\n", dlts[n_dlts]); } } free(dlts); exit(0); } /* * Set up flags that might or might not be supported depending on the * version of libpcap we're using. */ #ifdef WIN32 #define B_FLAG "B:" #define B_FLAG_USAGE " [ -B size ]" #else /* WIN32 */ #define B_FLAG #define B_FLAG_USAGE #endif /* WIN32 */ #ifdef HAVE_PCAP_FINDALLDEVS #define D_FLAG "D" #else #define D_FLAG #endif #ifdef HAVE_PCAP_DUMP_FLUSH #define U_FLAG "U" #else #define U_FLAG #endif int main(int argc, char **argv) { register int cnt, op, i; bpf_u_int32 localnet, netmask; register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName; pcap_handler callback; int type; struct bpf_program fcode; #ifndef WIN32 RETSIGTYPE (*oldhandler)(int); #endif struct print_info printinfo; struct dump_info dumpinfo; u_char *pcap_userdata; char ebuf[PCAP_ERRBUF_SIZE]; #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 */ cnt = -1; device = NULL; infile = NULL; RFileName = NULL; WFileName = NULL; if ((cp = strrchr(argv[0], '/')) != NULL) program_name = cp + 1; else program_name = argv[0]; if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0) error("%s", ebuf); #ifdef LIBSMI smiInit("tcpdump"); #endif 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:Y")) != -1) switch (op) { case 'a': /* compatibility for old -a */ break; case 'A': ++xflag; ++Xflag; ++Aflag; break; #ifdef WIN32 case 'B': UserBufferSize = atoi(optarg)*1024; if (UserBufferSize < 0) error("invalid packet buffer size %s", optarg); break; #endif /* WIN32 */ case 'c': cnt = atoi(optarg); if (cnt <= 0) error("invalid packet count %s", optarg); break; case 'C': Cflag = atoi(optarg) * 1000000; if (Cflag < 0) error("invalid file size %s", optarg); break; case 'd': ++dflag; break; #ifdef HAVE_PCAP_FINDALLDEVS case 'D': if (pcap_findalldevs(&devpointer, ebuf) < 0) error("%s", ebuf); else { for (i = 0; devpointer != 0; i++) { printf("%d.%s", i+1, devpointer->name); if (devpointer->description != NULL) printf(" (%s)", devpointer->description); printf("\n"); devpointer = devpointer->next; } } return 0; #endif /* HAVE_PCAP_FINDALLDEVS */ case 'L': Lflag++; break; case 'e': ++eflag; break; case 'E': #ifndef HAVE_LIBCRYPTO warning("crypto code not compiled in"); #endif espsecret = optarg; break; case 'f': ++fflag; break; case 'F': infile = optarg; break; case 'i': if (optarg[0] == '0' && optarg[1] == 0) error("Invalid adapter index"); #ifdef HAVE_PCAP_FINDALLDEVS /* * If the argument is a number, treat it as * an index into the list of adapters, as * printed by "tcpdump -D". * * This should be OK on UNIX systems, as interfaces * shouldn't have names that begin with digits. * It can be useful on Windows, where more than * one interface can have the same name. */ if ((devnum = atoi(optarg)) != 0) { if (devnum < 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"); } } device = devpointer->name; break; } #endif /* HAVE_PCAP_FINDALLDEVS */ device = optarg; break; case 'l': #ifdef WIN32 /* * _IOLBF is the same as _IOFBF in Microsoft's C * libraries; the only alternative they offer * is _IONBF. * * XXX - this should really be checking for MSVC++, * not WIN32, if, for example, MinGW has its own * C library that is more UNIX-compatible. */ setvbuf(stdout, NULL, _IONBF, 0); #else /* WIN32 */ #ifdef HAVE_SETLINEBUF setlinebuf(stdout); #else setvbuf(stdout, NULL, _IOLBF, 0); #endif #endif /* WIN32 */ break; case 'n': ++nflag; break; case 'N': ++Nflag; break; case 'm': #ifdef LIBSMI if (smiLoadModule(optarg) == 0) { error("could not load MIB module %s", optarg); } sflag = 1; #else (void)fprintf(stderr, "%s: ignoring option `-m %s' ", program_name, optarg); (void)fprintf(stderr, "(no libsmi support)\n"); #endif break; case 'O': Oflag = 0; break; case 'p': ++pflag; break; case 'q': ++qflag; break; case 'r': RFileName = optarg; break; case 'R': Rflag = 0; break; case 's': { char *end; snaplen = strtol(optarg, &end, 0); if (optarg == end || *end != '\0' || snaplen < 0 || snaplen > 65535) error("invalid snaplen %s", optarg); else if (snaplen == 0) snaplen = 65535; break; } case 'S': ++Sflag; break; case 't': --tflag; break; case 'T': if (strcasecmp(optarg, "vat") == 0) packettype = PT_VAT; else if (strcasecmp(optarg, "wb") == 0) packettype = PT_WB; else if (strcasecmp(optarg, "rpc") == 0) packettype = PT_RPC; else if (strcasecmp(optarg, "rtp") == 0) packettype = PT_RTP; else if (strcasecmp(optarg, "rtcp") == 0) packettype = PT_RTCP; else if (strcasecmp(optarg, "snmp") == 0) packettype = PT_SNMP; else if (strcasecmp(optarg, "cnfp") == 0) packettype = PT_CNFP; else if (strcasecmp(optarg, "tftp") == 0) packettype = PT_TFTP; else if (strcasecmp(optarg, "aodv") == 0) packettype = PT_AODV; else error("unknown packet type `%s'", optarg); break; case 'u': ++uflag; break; #ifdef HAVE_PCAP_DUMP_FLUSH case 'U': ++Uflag; break; #endif case 'v': ++vflag; break; case 'w': WFileName = optarg; break; case 'x': ++xflag; break; case 'X': ++xflag; ++Xflag; break; case 'y': dlt_name = optarg; dlt = pcap_datalink_name_to_val(dlt_name); if (dlt < 0) error("invalid data link type %s", dlt_name); break; #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG) case 'Y': { /* Undocumented flag */ #ifdef HAVE_PCAP_DEBUG extern int pcap_debug; pcap_debug = 1; #else extern int yydebug; yydebug = 1; #endif } break; #endif default: usage(); /* NOTREACHED */ } if (tflag > 0) thiszone = gmt2local(0); if (RFileName != NULL) { int dlt; const char *dlt_name; #ifndef WIN32 /* * We don't need network access, so relinquish any set-UID * or set-GID privileges we have (if any). * * We do *not* want set-UID privileges when opening a * trace file, as that might let the user read other * people's trace files (especially if we're set-UID * root). */ setuid(getuid()); #endif /* WIN32 */ pd = pcap_open_offline(RFileName, ebuf); if (pd == NULL) error("%s", ebuf); dlt = pcap_datalink(pd); dlt_name = pcap_datalink_val_to_name(dlt); if (dlt_name == NULL) { fprintf(stderr, "reading from file %s, link-type %u\n", RFileName, dlt); } else { fprintf(stderr, "reading from file %s, link-type %s (%s)\n", RFileName, dlt_name, pcap_datalink_val_to_description(dlt)); } localnet = 0; netmask = 0; if (fflag != 0) error("-f and -r options are incompatible"); } else { if (device == NULL) { device = pcap_lookupdev(ebuf); if (device == 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)) { fprintf(stderr, "%s: listening on %ws\n", program_name, device); } else { fprintf(stderr, "%s: listening on %s\n", program_name, device); } fflush(stderr); #endif /* WIN32 */ *ebuf = '\0'; pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); if (pd == NULL) error("%s", ebuf); else if (*ebuf) warning("%s", ebuf); #ifdef WIN32 if(UserBufferSize != 1000000) if(pcap_setbuff(pd, UserBufferSize)==-1){ error("%s", pcap_geterr(pd)); } #endif /* WIN32 */ if (Lflag) show_dlts_and_exit(pd); if (dlt >= 0) { #ifdef HAVE_PCAP_SET_DATALINK if (pcap_set_datalink(pd, dlt) < 0) error("%s", pcap_geterr(pd)); #else /* * We don't actually support changing the * data link type, so we only let them * set it to what it already is. */ if (dlt != pcap_datalink(pd)) { error("%s is not one of the DLTs supported by this device\n", dlt_name); } #endif (void)fprintf(stderr, "%s: data link type %s\n", program_name, dlt_name); (void)fflush(stderr); } i = pcap_snapshot(pd); if (snaplen < i) { warning("snaplen raised from %d to %d", snaplen, i); snaplen = i; } if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) { localnet = 0; netmask = 0; warning("%s", ebuf); } /* * Let user own process after socket has been opened. */ #ifndef WIN32 setuid(getuid()); #endif /* WIN32 */ } if (infile) cmdbuf = read_infile(infile); else cmdbuf = copy_argv(&argv[optind]); if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) error("%s", pcap_geterr(pd)); if (dflag) { bpf_dump(&fcode, dflag); pcap_close(pd); exit(0); } init_addrtoname(localnet, netmask); #ifndef WIN32 (void)setsignal(SIGPIPE, cleanup); #endif /* WIN32 */ (void)setsignal(SIGTERM, cleanup); (void)setsignal(SIGINT, cleanup); /* Cooperate with nohup(1) */ #ifndef WIN32 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL) (void)setsignal(SIGHUP, oldhandler); #endif /* WIN32 */ if (pcap_setfilter(pd, &fcode) < 0) error("%s", pcap_geterr(pd)); if (WFileName) { pcap_dumper_t *p = pcap_dump_open(pd, WFileName); if (p == NULL) error("%s", pcap_geterr(pd)); if (Cflag != 0) { callback = dump_packet_and_trunc; dumpinfo.WFileName = WFileName; dumpinfo.pd = pd; dumpinfo.p = p; pcap_userdata = (u_char *)&dumpinfo; } else { callback = dump_packet; pcap_userdata = (u_char *)p; } } else { type = pcap_datalink(pd); printinfo.printer = lookup_printer(type); if (printinfo.printer == NULL) { dlt_name = pcap_datalink_val_to_name(type); if (dlt_name != NULL) error("unsupported data link type %s", dlt_name); else error("unsupported data link type %d", type); } callback = print_packet; pcap_userdata = (u_char *)&printinfo; } #ifdef SIGINFO (void)setsignal(SIGINFO, requestinfo); #endif #ifndef WIN32 if (RFileName == NULL) { int dlt; const char *dlt_name; if (!vflag && !WFileName) { (void)fprintf(stderr, "%s: verbose output suppressed, use -v or -vv for full protocol decode\n", program_name); } else (void)fprintf(stderr, "%s: ", program_name); dlt = pcap_datalink(pd); dlt_name = pcap_datalink_val_to_name(dlt); if (dlt_name == NULL) { (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n", device, dlt, snaplen); } else { (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n", device, dlt_name, pcap_datalink_val_to_description(dlt), snaplen); } (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) { /* * 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); exit(status == -1 ? 1 : 0); } /* make a clean exit on interrupts */ static RETSIGTYPE cleanup(int signo _U_) { #ifdef HAVE_PCAP_BREAKLOOP /* * We have "pcap_breakloop()"; use it, so that we do as little * as possible in the signal handler (it's probably not safe * to do anything with standard I/O streams in a signal handler - * the ANSI C standard doesn't say it is). */ pcap_breakloop(pd); #else /* * We don't have "pcap_breakloop()"; this isn't safe, but * it's the best we can do. Print the summary if we're * not reading from a savefile - i.e., if we're doing a * live capture - and exit. */ if (pd != NULL && pcap_file(pd) == NULL) { /* * We got interrupted, so perhaps we didn't * manage to finish a line we were printing. * Print an extra newline, just in case. */ putchar('\n'); (void)fflush(stdout); info(1); } exit(0); #endif } static void info(register int verbose) { struct pcap_stat stat; if (pcap_stats(pd, &stat) < 0) { (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd)); return; } if (!verbose) fprintf(stderr, "%s: ", program_name); (void)fprintf(stderr, "%u packets captured", packets_captured); if (!verbose) fputs(", ", stderr); else putc('\n', stderr); (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv); if (!verbose) fputs(", ", stderr); else putc('\n', stderr); (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop); 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 uint cnt = 2; char *name; ++packets_captured; ++infodelay; dump_info = (struct dump_info *)user; /* * 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) { /* * Close the current file and open a new one. */ pcap_dump_close(dump_info->p); if (cnt >= 1000) error("too many output files"); 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++; dump_info->p = pcap_dump_open(dump_info->pd, name); free(name); if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); } pcap_dump((u_char *)dump_info->p, h, sp); #ifdef HAVE_PCAP_DUMP_FLUSH if (Uflag) pcap_dump_flush(dump_info->p); #endif --infodelay; if (infoprint) info(0); } static void dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) { ++packets_captured; ++infodelay; pcap_dump(user, h, sp); #ifdef HAVE_PCAP_DUMP_FLUSH if (Uflag) pcap_dump_flush((pcap_dumper_t *)user); #endif --infodelay; if (infoprint) info(0); } static void print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) { struct print_info *print_info; u_int hdrlen; ++packets_captured; ++infodelay; ts_print(&h->ts); print_info = (struct print_info *)user; /* * Some printers want to check that they're not walking off the * end of the packet. * Rather than pass it all the way down, we set this global. */ snapend = sp + h->caplen; hdrlen = (*print_info->printer)(h, sp); if (xflag) { /* * Print the raw packet data. */ if (xflag > 1) { /* * Include the link-layer header. */ default_print(sp, h->caplen); } else { /* * Don't include the link-layer header - and if * we have nothing past the link-layer header, * print nothing. */ if (h->caplen > hdrlen) default_print(sp + hdrlen, h->caplen - hdrlen); } } putchar('\n'); --infodelay; if (infoprint) info(0); } #ifdef WIN32 /* * XXX - there should really be libpcap calls to get the version * number as a string (the string would be generated from #defines * at run time, so that it's not generated from string constants * in the library, as, on many UNIX systems, those constants would * be statically linked into the application executable image, and * would thus reflect the version of libpcap on the system on * which the application was *linked*, not the system on which it's * *running*. * * That routine should be documented, unlike the "version[]" * string, so that UNIX vendors providing their own libpcaps * don't omit it (as a couple of vendors have...). * * Packet.dll should perhaps also export a routine to return the * version number of the Packet.dll code, to supply the * "Wpcap_version" information on Windows. */ char WDversion[]="current-cvs.tcpdump.org"; char version[]="current-cvs.tcpdump.org"; char pcap_version[]="current-cvs.tcpdump.org"; char Wpcap_version[]="3.0 alpha"; #endif /* * By default, print the specified data out in hex. */ void default_print(register const u_char *bp, register u_int length) { ascii_print("\n\t", bp, length); /* pass on lf and identation string */ } #ifdef SIGINFO RETSIGTYPE requestinfo(int signo _U_) { if (infodelay) ++infoprint; else info(0); } #endif static void usage(void) { extern char version[]; #ifndef HAVE_PCAP_LIB_VERSION #if defined(WIN32) || defined(HAVE_PCAP_VERSION) extern char pcap_version[]; #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */ static char pcap_version[] = "unknown"; #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */ #endif /* HAVE_PCAP_LIB_VERSION */ #ifdef HAVE_PCAP_LIB_VERSION (void)fprintf(stderr, "%s version %s\n", program_name, version); (void)fprintf(stderr, "%s\n", pcap_lib_version()); #else /* HAVE_PCAP_LIB_VERSION */ #ifdef WIN32 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version); #else /* WIN32 */ (void)fprintf(stderr, "%s version %s\n", program_name, version); (void)fprintf(stderr, "libpcap version %s\n", pcap_version); #endif /* WIN32 */ #endif /* HAVE_PCAP_LIB_VERSION */ (void)fprintf(stderr, "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name); (void)fprintf(stderr, "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n"); (void)fprintf(stderr, "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n"); (void)fprintf(stderr, "\t\t[ expression ]\n"); exit(1); }