Index: head/contrib/tcpdump/tcpdump.c =================================================================== --- head/contrib/tcpdump/tcpdump.c (revision 305988) +++ head/contrib/tcpdump/tcpdump.c (revision 305989) @@ -1,2806 +1,2805 @@ /* * 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 */ #ifndef lint 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"; #endif /* $FreeBSD$ */ /* * 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 /* * Mac OS X may ship pcap.h from libpcap 0.6 with a libpcap based on * 0.8. That means it has pcap_findalldevs() but the header doesn't * define pcap_if_t, meaning that we can't actually *use* pcap_findalldevs(). */ #ifdef HAVE_PCAP_FINDALLDEVS #ifndef HAVE_PCAP_IF_T #undef HAVE_PCAP_FINDALLDEVS #endif #endif #include #ifdef WIN32 #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 */ #ifdef USE_LIBSMI #include #endif #ifdef HAVE_LIBCRYPTO #include #endif #ifdef HAVE_GETOPT_LONG #include #else #include "getopt_long.h" #endif /* Capsicum-specific code requires macros from , which will fail * to compile if has already been included; including the headers * in the opposite order works fine. */ #ifdef __FreeBSD__ #include #include #include #endif /* __FreeBSD__ */ #ifdef HAVE_CASPER #include #include #include -#include #include #include #include #endif /* HAVE_CASPER */ #include #include #include #include #include #include #ifndef WIN32 #include #include #include #include #endif /* WIN32 */ /* capabilities convenience library */ /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H. * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG. * Thus, the later tests are done only on HAVE_LIBCAP_NG. */ #ifdef HAVE_LIBCAP_NG #ifdef HAVE_CAP_NG_H #include #else #undef HAVE_LIBCAP_NG #endif /* HAVE_CAP_NG_H */ #endif /* HAVE_LIBCAP_NG */ #include "netdissect.h" #include "interface.h" #include "addrtoname.h" #include "machdep.h" #include "setsignal.h" #include "gmt2local.h" #include "pcap-missing.h" #ifndef PATH_MAX #define PATH_MAX 1024 #endif #ifdef SIGINFO #define SIGNAL_REQ_INFO SIGINFO #elif SIGUSR1 #define SIGNAL_REQ_INFO SIGUSR1 #endif netdissect_options Gndo; netdissect_options *gndo = &Gndo; static int Dflag; /* list available devices and exit */ 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 #ifdef HAVE_PCAP_SETDIRECTION int Qflag = -1; /* restrict captured packet by send/receive direction */ #endif static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */ static int infodelay; static int infoprint; char *program_name; #ifdef HAVE_CASPER cap_channel_t *capdns; #endif int32_t thiszone; /* seconds offset from gmt to local time */ /* Forwards */ static RETSIGTYPE cleanup(int); static RETSIGTYPE child_cleanup(int); static void print_version(void); static void print_usage(void); 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, ...) __attribute__((noreturn)) #ifdef __ATTRIBUTE___FORMAT_OK __attribute__((format (printf, 2, 3))) #endif /* __ATTRIBUTE___FORMAT_OK */ ; static void ndo_warning(netdissect_options *ndo, const char *fmt, ...) #ifdef __ATTRIBUTE___FORMAT_OK __attribute__((format (printf, 2, 3))) #endif /* __ATTRIBUTE___FORMAT_OK */ ; #ifdef SIGNAL_REQ_INFO RETSIGTYPE requestinfo(int); #endif #if defined(USE_WIN32_MM_TIMER) #include static UINT timer_id; static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR); #elif defined(HAVE_ALARM) static void verbose_stats_dump(int sig); #endif static void info(int); static u_int packets_captured; struct printer { if_printer f; int type; }; struct ndo_printer { if_ndo_printer f; int type; }; static const struct printer printers[] = { { NULL, 0 }, }; static const 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 #if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H) { nflog_if_print, DLT_NFLOG}, #endif #ifdef DLT_CIP { cip_if_print, DLT_CIP }, #endif #ifdef DLT_ATM_CLIP { cip_if_print, DLT_ATM_CLIP }, #endif #ifdef DLT_IP_OVER_FC { ipfc_if_print, DLT_IP_OVER_FC }, #endif { null_if_print, DLT_NULL }, #ifdef DLT_LOOP { null_if_print, DLT_LOOP }, #endif #ifdef DLT_APPLE_IP_OVER_IEEE1394 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 }, #endif #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H) { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR}, #endif #ifdef DLT_LANE8023 { lane_if_print, DLT_LANE8023 }, #endif { arcnet_if_print, DLT_ARCNET }, #ifdef DLT_ARCNET_LINUX { arcnet_linux_if_print, DLT_ARCNET_LINUX }, #endif { raw_if_print, DLT_RAW }, #ifdef DLT_IPV4 { raw_if_print, DLT_IPV4 }, #endif #ifdef DLT_IPV6 { raw_if_print, DLT_IPV6 }, #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_SYMANTEC_FIREWALL { symantec_if_print, DLT_SYMANTEC_FIREWALL }, #endif #ifdef DLT_C_HDLC { chdlc_if_print, DLT_C_HDLC }, #endif #ifdef DLT_HDLC { chdlc_if_print, DLT_HDLC }, #endif #ifdef DLT_PPP_ETHER { pppoe_if_print, DLT_PPP_ETHER }, #endif #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H) { pflog_if_print, DLT_PFLOG }, #endif { token_if_print, DLT_IEEE802 }, { fddi_if_print, DLT_FDDI }, #ifdef DLT_LINUX_SLL { sll_if_print, DLT_LINUX_SLL }, #endif #ifdef DLT_FR { fr_if_print, DLT_FR }, #endif #ifdef DLT_FRELAY { fr_if_print, DLT_FRELAY }, #endif #ifdef DLT_MFR { mfr_if_print, DLT_MFR }, #endif { atm_if_print, DLT_ATM_RFC1483 }, #ifdef DLT_SUNATM { sunatm_if_print, DLT_SUNATM }, #endif #ifdef DLT_ENC { enc_if_print, DLT_ENC }, #endif { sl_if_print, DLT_SLIP }, #ifdef DLT_SLIP_BSDOS { sl_bsdos_if_print, DLT_SLIP_BSDOS }, #endif #ifdef DLT_LTALK { ltalk_if_print, DLT_LTALK }, #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_PKTAP { pktap_if_print, DLT_PKTAP }, #endif #ifdef DLT_IEEE802_11_RADIO { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO }, #endif #ifdef DLT_IEEE802_11 { ieee802_11_if_print, DLT_IEEE802_11}, #endif #ifdef DLT_IEEE802_11_RADIO_AVS { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS }, #endif #ifdef DLT_PRISM_HEADER { prism_if_print, DLT_PRISM_HEADER }, #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_SERIAL { ppp_hdlc_if_print, DLT_PPP_SERIAL }, #endif { NULL, 0 }, }; static const struct tok status_flags[] = { #ifdef PCAP_IF_UP { PCAP_IF_UP, "Up" }, #endif #ifdef PCAP_IF_RUNNING { PCAP_IF_RUNNING, "Running" }, #endif { PCAP_IF_LOOPBACK, "Loopback" }, { 0, NULL } }; if_printer lookup_printer(int type) { const struct printer *p; for (p = printers; p->f; ++p) if (type == p->type) return p->f; return NULL; /* NOTREACHED */ } if_ndo_printer lookup_ndo_printer(int type) { const struct ndo_printer *p; for (p = ndo_printers; p->f; ++p) if (type == p->type) return p->f; #if defined(DLT_USER2) && defined(DLT_PKTAP) /* * Apple incorrectly chose to use DLT_USER2 for their PKTAP * header. * * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin- * based OSes or the same value as LINKTYPE_PKTAP as it is on * other OSes, to LINKTYPE_PKTAP, so files written with * this version of libpcap for a DLT_PKTAP capture have a link- * layer header type of LINKTYPE_PKTAP. * * However, files written on OS X Mavericks for a DLT_PKTAP * capture have a link-layer header type of LINKTYPE_USER2. * If we don't have a printer for DLT_USER2, and type is * DLT_USER2, we look up the printer for DLT_PKTAP and use * that. */ if (type == DLT_USER2) { for (p = ndo_printers; p->f; ++p) if (DLT_PKTAP == p->type) return p->f; } #endif return NULL; /* NOTREACHED */ } static pcap_t *pd; static int supports_monitor_mode; extern int optind; extern int opterr; extern char *optarg; struct print_info { netdissect_options *ndo; union { if_printer printer; if_ndo_printer ndo_printer; } p; int ndo_type; }; struct dump_info { char *WFileName; char *CurrentFileName; pcap_t *pd; pcap_dumper_t *p; #ifdef __FreeBSD__ int dirfd; #endif }; #ifdef HAVE_PCAP_SET_TSTAMP_TYPE static void show_tstamp_types_and_exit(const char *device, pcap_t *pd) { int n_tstamp_types; int *tstamp_types = 0; const char *tstamp_type_name; int i; n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types); if (n_tstamp_types < 0) error("%s", pcap_geterr(pd)); if (n_tstamp_types == 0) { fprintf(stderr, "Time stamp type cannot be set for %s\n", device); exit(0); } fprintf(stderr, "Time stamp types for %s (use option -j to set):\n", device); for (i = 0; i < n_tstamp_types; i++) { tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]); if (tstamp_type_name != NULL) { (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name, pcap_tstamp_type_val_to_description(tstamp_types[i])); } else { (void) fprintf(stderr, " %d\n", tstamp_types[i]); } } pcap_free_tstamp_types(tstamp_types); exit(0); } #endif static void show_dlts_and_exit(const char *device, pcap_t *pd) { 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."); /* * 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]); 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 && lookup_ndo_printer(dlts[n_dlts]) == NULL) (void) fprintf(stderr, " (printing not supported)"); fprintf(stderr, "\n"); } else { (void) fprintf(stderr, " DLT %d (printing not supported)\n", dlts[n_dlts]); } } #ifdef HAVE_PCAP_FREE_DATALINKS pcap_free_datalinks(dlts); #endif exit(0); } #ifdef HAVE_PCAP_FINDALLDEVS static void show_devices_and_exit (void) { pcap_if_t *devpointer; char ebuf[PCAP_ERRBUF_SIZE]; int i; if (pcap_findalldevs(&devpointer, ebuf) < 0) error("%s", ebuf); else { for (i = 0; devpointer != NULL; i++) { printf("%d.%s", i+1, devpointer->name); if (devpointer->description != NULL) printf(" (%s)", devpointer->description); if (devpointer->flags != 0) printf(" [%s]", bittok2str(status_flags, "none", devpointer->flags)); printf("\n"); devpointer = devpointer->next; } } exit(0); } #endif /* HAVE_PCAP_FINDALLDEVS */ /* * Short options. * * Note that there we use all letters for short options except for g, k, * o, and P, and those are used by other versions of tcpdump, and we should * only use them for the same purposes that the other versions of tcpdump * use them: * * OS X tcpdump uses -g to force non--v output for IP to be on one * line, making it more "g"repable; * * OS X tcpdump uses -k tospecify that packet comments in pcap-ng files * should be printed; * * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done * for hosts sending TCP SYN packets; * * OS X tcpdump uses -P to indicate that -w should write pcap-ng rather * than pcap files. * * OS X tcpdump also uses -Q to specify expressions that match packet * metadata, including but not limited to the packet direction. * The expression syntax is different from a simple "in|out|inout", * and those expressions aren't accepted by OS X tcpdump, but the * equivalents would be "in" = "dir=in", "out" = "dir=out", and * "inout" = "dir=in or dir=out", and the parser could conceivably * special-case "in", "out", and "inout" as expressions for backwards * compatibility, so all is not (yet) lost. */ /* * Set up flags that might or might not be supported depending on the * version of libpcap we're using. */ #if defined(HAVE_PCAP_CREATE) || defined(WIN32) #define B_FLAG "B:" #define B_FLAG_USAGE " [ -B size ]" #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ #define B_FLAG #define B_FLAG_USAGE #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_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 #define D_FLAG "D" #else #define D_FLAG #endif #ifdef HAVE_PCAP_DUMP_FLUSH #define U_FLAG "U" #else #define U_FLAG #endif #ifdef HAVE_PCAP_SETDIRECTION #define Q_FLAG "Q:" #else #define Q_FLAG #endif #define SHORTOPTS "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpq" Q_FLAG "r:Rs:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:#" /* * Long options. * * We do not currently have long options corresponding to all short * options; we should probably pick appropriate option names for them. * * However, the short options where the number of times the option is * specified matters, such as -v and -d and -t, should probably not * just map to a long option, as saying * * tcpdump --verbose --verbose * * doesn't make sense; it should be --verbosity={N} or something such * as that. * * For long options with no corresponding short options, we define values * outside the range of ASCII graphic characters, make that the last * component of the entry for the long option, and have a case for that * option in the switch statement. */ #define OPTION_VERSION 128 #define OPTION_TSTAMP_PRECISION 129 #define OPTION_IMMEDIATE_MODE 130 static const struct option longopts[] = { #if defined(HAVE_PCAP_CREATE) || defined(WIN32) { "buffer-size", required_argument, NULL, 'B' }, #endif { "list-interfaces", no_argument, NULL, 'D' }, { "help", no_argument, NULL, 'h' }, { "interface", required_argument, NULL, 'i' }, #ifdef HAVE_PCAP_CREATE { "monitor-mode", no_argument, NULL, 'I' }, #endif #ifdef HAVE_PCAP_SET_TSTAMP_TYPE { "time-stamp-type", required_argument, NULL, 'j' }, { "list-time-stamp-types", no_argument, NULL, 'J' }, #endif #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION}, #endif { "dont-verify-checksums", no_argument, NULL, 'K' }, { "list-data-link-types", no_argument, NULL, 'L' }, { "no-optimize", no_argument, NULL, 'O' }, { "no-promiscuous-mode", no_argument, NULL, 'p' }, #ifdef HAVE_PCAP_SETDIRECTION { "direction", required_argument, NULL, 'Q' }, #endif { "snapshot-length", required_argument, NULL, 's' }, { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' }, #ifdef HAVE_PCAP_DUMP_FLUSH { "packet-buffered", no_argument, NULL, 'U' }, #endif { "linktype", required_argument, NULL, 'y' }, #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE }, #endif #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG) { "debug-filter-parser", no_argument, NULL, 'Y' }, #endif { "relinquish-privileges", required_argument, NULL, 'Z' }, { "number", no_argument, NULL, '#' }, { "version", no_argument, NULL, OPTION_VERSION }, { NULL, 0, NULL, 0 } }; #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 (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); } } #ifdef HAVE_LIBCAP_NG int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG); if (ret < 0) { fprintf(stderr, "error : ret %d\n", ret); } else { fprintf(stderr, "dropped privs to %s\n", username); } #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", username, (unsigned long)pw->pw_uid, (unsigned long)pw->pw_gid, pcap_strerror(errno)); exit(1); } else { fprintf(stderr, "dropped privs to %s\n", username); } #endif /* HAVE_LIBCAP_NG */ } else { fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n", username); exit(1); } #ifdef HAVE_LIBCAP_NG /* We don't need CAP_SETUID and CAP_SETGID any more. */ capng_updatev( CAPNG_DROP, CAPNG_EFFECTIVE | CAPNG_PERMITTED, CAP_SETUID, CAP_SETGID, -1); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ } #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(PATH_MAX + 1); if (filename == NULL) error("Makefilename: malloc"); /* 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, PATH_MAX, orig_name, local_tm); } else { strncpy(filename, orig_name, PATH_MAX); } if (cnt == 0 && max_chars == 0) strncpy(buffer, filename, PATH_MAX + 1); else if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX) /* Report an error if the filename is too large */ error("too many output files or filename is too long (> %d)", PATH_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; } static 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); } static char * get_next_file(FILE *VFile, char *ptr) { char *ret; ret = fgets(ptr, PATH_MAX, VFile); if (!ret) return NULL; if (ptr[strlen(ptr) - 1] == '\n') ptr[strlen(ptr) - 1] = '\0'; return ret; } #ifdef HAVE_CASPER static cap_channel_t * capdns_setup(void) { cap_channel_t *capcas, *capdnsloc; const char *types[1]; int families[2]; capcas = cap_init(); if (capcas == NULL) error("unable to create casper process"); capdnsloc = cap_service_open(capcas, "system.dns"); /* Casper capability no longer needed. */ cap_close(capcas); if (capdnsloc == NULL) error("unable to open system.dns service"); /* Limit system.dns to reverse DNS lookups. */ types[0] = "ADDR"; if (cap_dns_type_limit(capdnsloc, types, 1) < 0) error("unable to limit access to system.dns service"); families[0] = AF_INET; families[1] = AF_INET6; if (cap_dns_family_limit(capdnsloc, families, 2) < 0) error("unable to limit access to system.dns service"); return (capdnsloc); } #endif /* HAVE_CASPER */ #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION static int tstamp_precision_from_string(const char *precision) { if (strncmp(precision, "nano", strlen("nano")) == 0) return PCAP_TSTAMP_PRECISION_NANO; if (strncmp(precision, "micro", strlen("micro")) == 0) return PCAP_TSTAMP_PRECISION_MICRO; return -EINVAL; } static const char * tstamp_precision_to_string(int precision) { switch (precision) { case PCAP_TSTAMP_PRECISION_MICRO: return "micro"; case PCAP_TSTAMP_PRECISION_NANO: return "nano"; default: return "unknown"; } } #endif #ifdef __FreeBSD__ /* * Ensure that, on a dump file's descriptor, we have all the rights * necessary to make the standard I/O library work with an fdopen()ed * FILE * from that descriptor. * * A long time ago, in a galaxy far far away, AT&T decided that, instead * of providing separate APIs for getting and setting the FD_ flags on a * descriptor, getting and setting the O_ flags on a descriptor, and * locking files, they'd throw them all into a kitchen-sink fcntl() call * along the lines of ioctl(), the fact that ioctl() operations are * largely specific to particular character devices but fcntl() operations * are either generic to all descriptors or generic to all descriptors for * regular files nonwithstanding. * * The Capsicum people decided that fine-grained control of descriptor * operations was required, so that you need to grant permission for * reading, writing, seeking, and fcntl-ing. The latter, courtesy of * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley * collection of things, so there are *individual* fcntls for which * permission needs to be granted. * * The FreeBSD standard I/O people implemented some optimizations that * requires that the standard I/O routines be able to determine whether * the descriptor for the FILE * is open append-only or not; as that * descriptor could have come from an open() rather than an fopen(), * that requires that it be able to do an F_GETFL fcntl() to read * the O_ flags. * * Tcpdump uses ftell() to determine how much data has been written * to a file in order to, when used with -C, determine when it's time * to rotate capture files. ftell() therefore needs to do an lseek() * to find out the file offset and must, thanks to the aforementioned * optimization, also know whether the descriptor is open append-only * or not. * * The net result of all the above is that we need to grant CAP_SEEK, * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability. * * Perhaps this is the universe's way of saying that either * * 1) there needs to be an fopenat() call and a pcap_dump_openat() call * using it, so that Capsicum-capable tcpdump wouldn't need to do * an fdopen() * * or * * 2) there needs to be a cap_fdopen() call in the FreeBSD standard * I/O library that knows what rights are needed by the standard * I/O library, based on the open mode, and assigns them, perhaps * with an additional argument indicating, for example, whether * seeking should be allowed, so that tcpdump doesn't need to know * what the standard I/O library happens to require this week. */ static void set_dumper_capsicum_rights(pcap_dumper_t *p) { int fd = fileno(pcap_dump_file(p)); cap_rights_t rights; cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL); if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) { error("unable to limit dump descriptor"); } if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) { error("unable to limit dump descriptor fcntls"); } } #endif int main(int argc, char **argv) { register int cnt, op, i; bpf_u_int32 localnet =0 , netmask = 0; 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); #endif struct print_info printinfo; struct dump_info dumpinfo; u_char *pcap_userdata; char ebuf[PCAP_ERRBUF_SIZE]; char VFileLine[PATH_MAX + 1]; char *username = NULL; char *chroot_dir = NULL; char *ret = NULL; char *end; #ifdef HAVE_PCAP_FINDALLDEVS pcap_if_t *devpointer; int devnum; #endif int status; FILE *VFile; #ifdef __FreeBSD__ cap_rights_t rights; #endif /* !__FreeBSD__ */ int cansandbox; #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; 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; gndo->ndo_immediate = 0; cnt = -1; device = NULL; infile = NULL; RFileName = NULL; VFileName = NULL; VFile = NULL; WFileName = NULL; dlt = -1; if ((cp = strrchr(argv[0], '/')) != NULL) program_name = cp + 1; else program_name = argv[0]; /* * On platforms where the CPU doesn't support unaligned loads, * force unaligned accesses to abort with SIGBUS, rather than * being fixed up (slowly) by the OS kernel; on those platforms, * misaligned accesses are bugs, and we want tcpdump to crash so * that the bugs are reported. */ if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0) error("%s", ebuf); #ifdef USE_LIBSMI smiInit("tcpdump"); #endif while ( (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1) switch (op) { case 'a': /* compatibility for old -a */ break; case 'A': ++Aflag; break; case 'b': ++bflag; break; #if defined(HAVE_PCAP_CREATE) || defined(WIN32) case 'B': Bflag = atoi(optarg)*1024; if (Bflag <= 0) error("invalid packet buffer size %s", optarg); break; #endif /* defined(HAVE_PCAP_CREATE) || defined(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; case 'D': Dflag++; break; case 'L': Lflag++; break; case 'e': ++eflag; break; case 'E': #ifndef HAVE_LIBCRYPTO warning("crypto code not compiled in"); #endif gndo->ndo_espsecret = optarg; break; case 'f': ++fflag; 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 'h': print_usage(); exit(0); break; case 'H': ++Hflag; 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. */ devnum = strtol(optarg, &end, 10); if (optarg != end && *end == '\0') { if (devnum < 0) error("Invalid adapter index"); if (pcap_findalldevs(&devpointer, ebuf) < 0) error("%s", ebuf); else { /* * 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; } #endif /* HAVE_PCAP_FINDALLDEVS */ device = optarg; break; #ifdef HAVE_PCAP_CREATE case 'I': ++Iflag; 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 /* * _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 'K': ++Kflag; break; case 'm': #ifdef USE_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 '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 'p': ++pflag; break; case 'q': ++qflag; ++suppress_default_print; break; #ifdef HAVE_PCAP_SETDIRECTION case 'Q': if (strcasecmp(optarg, "in") == 0) Qflag = PCAP_D_IN; else if (strcasecmp(optarg, "out") == 0) Qflag = PCAP_D_OUT; else if (strcasecmp(optarg, "inout") == 0) Qflag = PCAP_D_INOUT; else error("unknown capture direction `%s'", optarg); break; #endif /* HAVE_PCAP_SETDIRECTION */ case 'r': RFileName = optarg; break; case 'R': Rflag = 0; break; case 's': snaplen = strtol(optarg, &end, 0); if (optarg == end || *end != '\0' || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN) error("invalid snaplen %s", optarg); else if (snaplen == 0) snaplen = MAXIMUM_SNAPLEN; 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 if (strcasecmp(optarg, "carp") == 0) packettype = PT_CARP; else if (strcasecmp(optarg, "radius") == 0) packettype = PT_RADIUS; else if (strcasecmp(optarg, "zmtp1") == 0) packettype = PT_ZMTP1; else if (strcasecmp(optarg, "vxlan") == 0) packettype = PT_VXLAN; else if (strcasecmp(optarg, "pgm") == 0) packettype = PT_PGM; else if (strcasecmp(optarg, "pgm_zmtp1") == 0) packettype = PT_PGM_ZMTP1; else if (strcasecmp(optarg, "lmp") == 0) packettype = PT_LMP; 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 'V': VFileName = optarg; break; case 'w': 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; ++suppress_default_print; break; case 'y': 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) case 'Y': { /* Undocumented flag */ #ifdef HAVE_PCAP_DEBUG extern int pcap_debug; pcap_debug = 1; #else extern int yydebug; yydebug = 1; #endif } break; #endif case 'z': zflag = strdup(optarg); break; case 'Z': username = strdup(optarg); break; case '#': gndo->ndo_packet_number = 1; break; case OPTION_VERSION: print_version(); exit(0); break; #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION case OPTION_TSTAMP_PRECISION: gndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg); if (gndo->ndo_tstamp_precision < 0) error("unsupported time stamp precision"); break; #endif #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE case OPTION_IMMEDIATE_MODE: gndo->ndo_immediate = 1; break; #endif default: print_usage(); exit(1); /* NOTREACHED */ } #ifdef HAVE_PCAP_FINDALLDEVS if (Dflag) show_devices_and_exit(); #endif 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; } 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 HAVE_PCAP_SET_IMMEDIATE_MODE /* * If we're printing dissected packets to the standard output * rather than saving raw packets to a file, and the standard * output is a terminal, use immediate mode, as the user's * probably expecting to see packets pop up immediately. */ if (WFileName == NULL && isatty(1)) gndo->ndo_immediate = 1; #endif #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 || VFileName != NULL) { /* * If RFileName is non-null, it's the pathname of a * savefile to read. If VFileName is non-null, it's * the pathname of a file containing a list of pathnames * (one per line) of savefiles to read. * * In either case, we're reading a savefile, not doing * a live capture. */ #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). */ 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; } #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION pd = pcap_open_offline_with_tstamp_precision(RFileName, gndo->ndo_tstamp_precision, ebuf); #else pd = pcap_open_offline(RFileName, ebuf); #endif if (pd == NULL) error("%s", ebuf); #ifdef HAVE_CASPER cap_rights_init(&rights, CAP_READ); if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 && errno != ENOSYS) { error("unable to limit pcap descriptor"); } #endif 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)); } } else { /* * We're doing a live capture. */ if (device == NULL) { device = pcap_lookupdev(ebuf); if (device == NULL) error("%s", ebuf); } #ifdef WIN32 /* * Print a message to the standard error on Windows. * XXX - why do it here, with a different message? */ 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 %s\n", program_name, device); } fflush(stderr); #endif /* WIN32 */ #ifdef HAVE_PCAP_CREATE 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 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION status = pcap_set_tstamp_precision(pd, gndo->ndo_tstamp_precision); if (status != 0) error("%s: Can't set %ssecond time stamp precision: %s", device, tstamp_precision_to_string(gndo->ndo_tstamp_precision), pcap_statustostr(status)); #endif #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE if (gndo->ndo_immediate) { status = pcap_set_immediate_mode(pd, 1); if (status != 0) error("%s: Can't set immediate mode: %s", device, pcap_statustostr(status)); } #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: Can't set snapshot length: %s", device, pcap_statustostr(status)); status = pcap_set_promisc(pd, !pflag); if (status != 0) 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: Can't set monitor mode: %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: 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) { /* * 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); #ifdef __FreeBSD__ else if (status == PCAP_ERROR_RFMON_NOTSUP && strncmp(device, "wlan", 4) == 0) { char parent[8], newdev[8]; char sysctl[32]; size_t s = sizeof(parent); snprintf(sysctl, sizeof(sysctl), "net.wlan.%d.%%parent", atoi(device + 4)); sysctlbyname(sysctl, parent, &s, NULL, 0); strlcpy(newdev, device, sizeof(newdev)); /* Suggest a new wlan device. */ newdev[strlen(newdev)-1]++; error("%s is not a monitor mode VAP\n" "To create a new monitor mode VAP use:\n" " ifconfig %s create wlandev %s wlanmode " "monitor\nand use %s as the tcpdump " "interface", device, newdev, parent, newdev); } #endif 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)); } #ifdef HAVE_PCAP_SETDIRECTION if (Qflag != -1) { status = pcap_setdirection(pd, Qflag); if (status != 0) error("%s: pcap_setdirection() failed: %s", device, pcap_geterr(pd)); } #endif /* HAVE_PCAP_SETDIRECTION */ #else *ebuf = '\0'; pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); if (pd == NULL) error("%s", ebuf); else if (*ebuf) warning("%s", ebuf); #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 /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */ if (Lflag) 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) 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 (gndo->ndo_dlt != pcap_datalink(pd)) { error("%s is not one of the DLTs supported by this device\n", gndo->ndo_dltname); } #endif (void)fprintf(stderr, "%s: data link type %s\n", program_name, gndo->ndo_dltname); (void)fflush(stderr); } i = pcap_snapshot(pd); if (snaplen < i) { warning("snaplen raised from %d to %d", snaplen, i); snaplen = i; } if(fflag != 0) { if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) { warning("foreign (-f) flag used but: %s", ebuf); } } } 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); free(cmdbuf); exit(0); } #ifdef HAVE_CASPER if (!nflag) capdns = capdns_setup(); #endif /* HAVE_CASPER */ init_addrtoname(gndo, localnet, netmask); init_checksum(); #ifndef WIN32 (void)setsignal(SIGPIPE, cleanup); (void)setsignal(SIGTERM, cleanup); (void)setsignal(SIGINT, 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. */ if (getuid() == 0 || geteuid() == 0) { #ifdef HAVE_LIBCAP_NG /* Initialize capng */ capng_clear(CAPNG_SELECT_BOTH); if (username) { capng_updatev( CAPNG_ADD, CAPNG_PERMITTED | CAPNG_EFFECTIVE, CAP_SETUID, CAP_SETGID, -1); } if (WFileName) { capng_update( CAPNG_ADD, CAPNG_PERMITTED | CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE ); } capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ if (username || chroot_dir) droproot(username, chroot_dir); } #endif /* WIN32 */ if (pcap_setfilter(pd, &fcode) < 0) error("%s", pcap_geterr(pd)); #ifdef HAVE_CASPER if (RFileName == NULL && VFileName == NULL) { static const unsigned long cmds[] = { BIOCGSTATS }; /* * The various libpcap devices use a combination of * read (bpf), ioctl (bpf, netmap), poll (netmap). * Grant the relevant access rights, sorted by name. */ cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ); if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 && errno != ENOSYS) { error("unable to limit pcap descriptor"); } if (cap_ioctls_limit(pcap_fileno(pd), cmds, sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) { error("unable to limit ioctls on pcap descriptor"); } } #endif if (WFileName) { pcap_dumper_t *p; /* Do not exceed the default PATH_MAX for files. */ dumpinfo.CurrentFileName = (char *)malloc(PATH_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); #ifdef HAVE_LIBCAP_NG /* Give up CAP_DAC_OVERRIDE capability. * Only allow it to be restored if the -C or -G flag have been * set since we may need to create more files later on. */ capng_update( CAPNG_DROP, (Cflag || Gflag ? 0 : CAPNG_PERMITTED) | CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE ); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ if (p == NULL) error("%s", pcap_geterr(pd)); #ifdef __FreeBSD__ set_dumper_capsicum_rights(p); #endif if (Cflag != 0 || Gflag != 0) { #ifdef __FreeBSD__ dumpinfo.WFileName = strdup(basename(WFileName)); dumpinfo.dirfd = open(dirname(WFileName), O_DIRECTORY | O_RDONLY); if (dumpinfo.dirfd < 0) { error("unable to open directory %s", dirname(WFileName)); } cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL, CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE); if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 && errno != ENOSYS) { error("unable to limit directory rights"); } if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) { error("unable to limit dump descriptor fcntls"); } #else /* !__FreeBSD__ */ dumpinfo.WFileName = WFileName; #endif callback = dump_packet_and_trunc; dumpinfo.pd = pd; dumpinfo.p = p; pcap_userdata = (u_char *)&dumpinfo; } else { 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 = get_print_info(type); callback = print_packet; pcap_userdata = (u_char *)&printinfo; } #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(SIGNAL_REQ_INFO, requestinfo); #endif if (vflag > 0 && WFileName) { /* * When capturing to a file, "-v" means tcpdump should, * every 10 secodns, "v"erbosely report the number of * packets captured. */ #ifdef USE_WIN32_MM_TIMER /* call verbose_stats_dump() each 1000 +/-100msec */ timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC); setvbuf(stderr, NULL, _IONBF, 0); #elif defined(HAVE_ALARM) (void)setsignal(SIGALRM, verbose_stats_dump); alarm(1); #endif } #ifndef WIN32 if (RFileName == NULL) { /* * Live capture (if -V was specified, we set RFileName * to a file from the -V file). Print a message to * the standard error on UN*X. */ 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 */ #ifdef __FreeBSD__ cansandbox = (VFileName == NULL && zflag == NULL); #ifdef HAVE_CASPER cansandbox = (cansandbox && (nflag || capdns != NULL)); #else cansandbox = (cansandbox && nflag); #endif if (cansandbox && cap_enter() < 0 && errno != ENOSYS) error("unable to enter the capability mode"); #endif /* __FreeBSD__ */ do { 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 == -2) { /* * We got interrupted. If we are reading multiple * files (via -V) set these so that we stop. */ VFileName = NULL; ret = NULL; } 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); #ifdef HAVE_CASPER cap_rights_init(&rights, CAP_READ); if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 && errno != ENOSYS) { error("unable to limit pcap descriptor"); } #endif 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)); } } } while (ret != NULL); free(cmdbuf); exit(status == -1 ? 1 : 0); } /* make a clean exit on interrupts */ static RETSIGTYPE cleanup(int signo _U_) { #ifdef USE_WIN32_MM_TIMER if (timer_id) timeKillEvent(timer_id); timer_id = 0; #elif defined(HAVE_ALARM) alarm(0); #endif #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 } /* On windows, we do not use a fork, so we do not care less about waiting a child processes to die */ #if defined(HAVE_FORK) || defined(HAVE_VFORK) static RETSIGTYPE child_cleanup(int signo _U_) { wait(NULL); } #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; return; } if (!verbose) fprintf(stderr, "%s: ", program_name); (void)fprintf(stderr, "%u packet%s captured", packets_captured, PLURAL_SUFFIX(packets_captured)); if (!verbose) fputs(", ", stderr); else putc('\n', stderr); (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, "%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; } #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 */ #ifdef NZERO setpriority(PRIO_PROCESS, 0, NZERO - 1); #else setpriority(PRIO_PROCESS, 0, 19); #endif 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 /* HAVE_FORK && HAVE_VFORK */ static void compress_savefile(const char *filename) { fprintf(stderr, "compress_savefile failed. Functionality not implemented under your system\n"); } #endif /* HAVE_FORK && HAVE_VFORK */ static void dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) { struct dump_info *dump_info; ++packets_captured; ++infodelay; 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) { #ifdef __FreeBSD__ FILE *fp; int fd; #endif /* 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(PATH_MAX + 1); if (dump_info->CurrentFileName == NULL) error("dump_packet_and_trunc: malloc"); /* * Gflag was set otherwise we wouldn't be here. Reset the count * so multiple files would end with 1,2,3 in the filename. * The counting is handled with the -C flow after this. */ Cflag_count = 0; /* * 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); #ifdef HAVE_LIBCAP_NG capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ #ifdef __FreeBSD__ fd = openat(dump_info->dirfd, dump_info->CurrentFileName, O_CREAT | O_WRONLY | O_TRUNC, 0644); if (fd < 0) { error("unable to open file %s", dump_info->CurrentFileName); } fp = fdopen(fd, "w"); if (fp == NULL) { error("unable to fdopen file %s", dump_info->CurrentFileName); } dump_info->p = pcap_dump_fopen(dump_info->pd, fp); #else /* !__FreeBSD__ */ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); #endif #ifdef HAVE_LIBCAP_NG capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); #ifdef __FreeBSD__ set_dumper_capsicum_rights(dump_info->p); #endif } } /* * 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 (Cflag != 0) { long size = pcap_dump_ftell(dump_info->p); if (size == -1) error("ftell fails on output file"); if (size > Cflag) { #ifdef __FreeBSD__ FILE *fp; int fd; #endif /* * 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); 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(PATH_MAX + 1); if (dump_info->CurrentFileName == NULL) error("dump_packet_and_trunc: malloc"); MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars); #ifdef HAVE_LIBCAP_NG capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ #ifdef __FreeBSD__ fd = openat(dump_info->dirfd, dump_info->CurrentFileName, O_CREAT | O_WRONLY | O_TRUNC, 0644); if (fd < 0) { error("unable to open file %s", dump_info->CurrentFileName); } fp = fdopen(fd, "w"); if (fp == NULL) { error("unable to fdopen file %s", dump_info->CurrentFileName); } dump_info->p = pcap_dump_fopen(dump_info->pd, fp); #else /* !__FreeBSD__ */ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); #endif #ifdef HAVE_LIBCAP_NG capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); capng_apply(CAPNG_SELECT_BOTH); #endif /* HAVE_LIBCAP_NG */ if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); #ifdef __FreeBSD__ set_dumper_capsicum_rights(dump_info->p); #endif } } 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; netdissect_options *ndo; ++packets_captured; ++infodelay; print_info = (struct print_info *)user; ndo = print_info->ndo; if(ndo->ndo_packet_number) ND_PRINT((ndo, "%5u ", packets_captured)); ts_print(ndo, &h->ts); /* * 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 member * of the netdissect_options structure. */ ndo->ndo_snapend = sp + h->caplen; if(print_info->ndo_type) { hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp); } else { hdrlen = (*print_info->p.printer)(h, sp); } /* * Restore the original snapend, as a printer might have * changed it. */ ndo->ndo_snapend = sp + h->caplen; if (ndo->ndo_Xflag) { /* * Print the raw packet data in hex and ASCII. */ if (ndo->ndo_Xflag > 1) { /* * Include the link-layer header. */ hex_and_ascii_print(ndo, "\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(ndo, "\n\t", sp + hdrlen, h->caplen - hdrlen); } } else if (ndo->ndo_xflag) { /* * Print the raw packet data in hex. */ if (ndo->ndo_xflag > 1) { /* * Include the link-layer header. */ hex_print(ndo, "\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_print(ndo, "\n\t", sp + hdrlen, h->caplen - hdrlen); } } else if (ndo->ndo_Aflag) { /* * Print the raw packet data in ASCII. */ if (ndo->ndo_Aflag > 1) { /* * Include the link-layer header. */ ascii_print(ndo, 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(ndo, 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-git.tcpdump.org"; #if !defined(HAVE_GENERATED_VERSION) char version[]="current-git.tcpdump.org"; #endif char pcap_version[]="current-git.tcpdump.org"; char Wpcap_version[]="3.1"; #endif /* * By default, print the specified data out in hex and ASCII. */ static void ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length) { hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */ } void default_print(const u_char *bp, u_int length) { ndo_default_print(gndo, bp, length); } #ifdef SIGNAL_REQ_INFO RETSIGTYPE requestinfo(int signo _U_) { if (infodelay) ++infoprint; else info(0); } #endif /* * Called once each second in verbose mode while dumping to file */ #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_) { struct pcap_stat stat; if (infodelay == 0 && pcap_stats(pd, &stat) >= 0) fprintf(stderr, "Got %u\r", packets_captured); } #elif defined(HAVE_ALARM) static void verbose_stats_dump(int sig _U_) { struct pcap_stat stat; if (infodelay == 0 && pcap_stats(pd, &stat) >= 0) fprintf(stderr, "Got %u\r", packets_captured); alarm(1); } #endif USES_APPLE_DEPRECATED_API static void print_version(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 #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); #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); (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 */ #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION) (void)fprintf (stderr, "%s\n", SSLeay_version(SSLEAY_VERSION)); #endif #ifdef USE_LIBSMI (void)fprintf (stderr, "SMI-library: %s\n", smi_version_string); #endif } USES_APPLE_RST static void print_usage(void) { print_version(); (void)fprintf(stderr, "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 ]" j_FLAG_USAGE " [ -M secret ] [ --number ]\n"); #ifdef HAVE_PCAP_SETDIRECTION (void)fprintf(stderr, "\t\t[ -Q in|out|inout ]\n"); #endif (void)fprintf(stderr, "\t\t[ -r file ] [ -s snaplen ] "); #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION (void)fprintf(stderr, "[ --time-stamp-precision precision ]\n"); (void)fprintf(stderr, "\t\t"); #endif #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE (void)fprintf(stderr, "[ --immediate-mode ] "); #endif (void)fprintf(stderr, "[ -T type ] [ --version ] [ -V file ]\n"); (void)fprintf(stderr, "\t\t[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z command ]\n"); (void)fprintf(stderr, "\t\t[ -Z user ] [ expression ]\n"); } /* 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); } } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */