X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/997e4c69542f1ba6e2f4498fa633bbb2d9309d58..052094d865be2d613f1e0ec7c220f9e4d38a0b22:/tcpdump.c diff --git a/tcpdump.c b/tcpdump.c index a311f3f0..25feb7a0 100644 --- 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_ = - "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.266 2005-12-13 13:44:30 hannes Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)"; #endif /* @@ -65,12 +65,16 @@ extern int SIZE_BUF; #include #include #include +#include #ifndef WIN32 +#include +#include #include #include #include #endif /* WIN32 */ + #include "netdissect.h" #include "interface.h" #include "addrtoname.h" @@ -88,6 +92,7 @@ netdissect_options *gndo = &Gndo; int dflag; /* print filter code */ int Lflag; /* list available data link types and exit */ +char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */ static int infodelay; static int infoprint; @@ -98,6 +103,7 @@ int32_t thiszone; /* seconds offset from gmt to local time */ /* Forwards */ static RETSIGTYPE cleanup(int); +static RETSIGTYPE child_cleanup(int); static void usage(void) __attribute__((noreturn)); static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn)); @@ -186,7 +192,7 @@ static struct printer printers[] = { #ifdef DLT_LTALK { ltalk_if_print, DLT_LTALK }, #endif -#ifdef DLT_PFLOG +#if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H) { pflog_if_print, DLT_PFLOG }, #endif #ifdef DLT_FR @@ -216,6 +222,9 @@ static struct printer printers[] = { #ifdef DLT_APPLE_IP_OVER_IEEE1394 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 }, #endif +#ifdef DLT_IEEE802_11_RADIO_AVS + { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS }, +#endif #ifdef DLT_JUNIPER_ATM1 { juniper_atm1_print, DLT_JUNIPER_ATM1 }, #endif @@ -263,6 +272,18 @@ static struct printer printers[] = { #endif #ifdef DLT_MFR { mfr_if_print, DLT_MFR }, +#endif +#if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H) + { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR}, +#endif +#if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX) + { usb_linux_print, DLT_USB_LINUX}, +#endif +#if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX_MMAPPED) + { usb_linux_print, DLT_USB_LINUX_MMAPPED}, +#endif +#ifdef DLT_IPNET + { ipnet_if_print, DLT_IPNET }, #endif { NULL, 0 }, }; @@ -292,6 +313,7 @@ struct print_info { struct dump_info { char *WFileName; + char *CurrentFileName; pcap_t *pd; pcap_dumper_t *p; }; @@ -321,10 +343,10 @@ show_dlts_and_exit(pcap_t *pd) * OK, does tcpdump handle that type? */ if (lookup_printer(dlts[n_dlts]) == NULL) - (void) fprintf(stderr, " (not supported)"); + (void) fprintf(stderr, " (printing not supported)"); putchar('\n'); } else { - (void) fprintf(stderr, " DLT %d (not supported)\n", + (void) fprintf(stderr, " DLT %d (printing not supported)\n", dlts[n_dlts]); } } @@ -336,13 +358,19 @@ show_dlts_and_exit(pcap_t *pd) * Set up flags that might or might not be supported depending on the * version of libpcap we're using. */ -#ifdef WIN32 +#if defined(HAVE_PCAP_CREATE) || defined(WIN32) #define B_FLAG "B:" #define B_FLAG_USAGE " [ -B size ]" -#else /* WIN32 */ +#else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ #define B_FLAG #define B_FLAG_USAGE -#endif /* WIN32 */ +#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ + +#ifdef HAVE_PCAP_CREATE +#define I_FLAG "I" +#else /* HAVE_PCAP_CREATE */ +#define I_FLAG +#endif /* HAVE_PCAP_CREATE */ #ifdef HAVE_PCAP_FINDALLDEVS #ifndef HAVE_PCAP_IF_T @@ -466,7 +494,7 @@ main(int argc, char **argv) { register int cnt, op, i; bpf_u_int32 localnet, netmask; - register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt; + register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName; pcap_handler callback; int type; struct bpf_program fcode; @@ -485,7 +513,6 @@ main(int argc, char **argv) #endif int status; #ifdef WIN32 - u_int UserBufferSize = 1000000; if(wsockinit() != 0) return 1; #endif /* WIN32 */ @@ -517,7 +544,7 @@ main(int argc, char **argv) opterr = 0; while ( - (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1) + (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1) switch (op) { case 'a': @@ -527,14 +554,17 @@ main(int argc, char **argv) case 'A': ++Aflag; break; + case 'b': + ++bflag; + break; -#ifdef WIN32 +#if defined(HAVE_PCAP_CREATE) || defined(WIN32) case 'B': - UserBufferSize = atoi(optarg)*1024; - if (UserBufferSize < 0) + Bflag = atoi(optarg)*1024; + if (Bflag <= 0) error("invalid packet buffer size %s", optarg); break; -#endif /* WIN32 */ +#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ case 'c': cnt = atoi(optarg); @@ -628,11 +658,17 @@ main(int argc, char **argv) if (pcap_findalldevs(&devpointer, ebuf) < 0) error("%s", ebuf); else { - for (i = 0; i < devnum-1; i++){ - devpointer = devpointer->next; - if (devpointer == NULL) - error("Invalid adapter index"); - } + /* + * Look for the devnum-th entry + * in the list of devices + * (1-based). + */ + for (i = 0; + i < devnum-1 && devpointer != NULL; + i++, devpointer = devpointer->next) + ; + if (devpointer == NULL) + error("Invalid adapter index"); } device = devpointer->name; break; @@ -641,6 +677,12 @@ main(int argc, char **argv) device = optarg; break; +#ifdef HAVE_PCAP_CREATE + case 'I': + ++Iflag; + break; +#endif /* HAVE_PCAP_CREATE */ + case 'l': #ifdef WIN32 /* @@ -662,12 +704,8 @@ main(int argc, char **argv) #endif /* WIN32 */ break; - case 'n': - ++nflag; - break; - - case 'N': - ++Nflag; + case 'K': + ++Kflag; break; case 'm': @@ -688,7 +726,15 @@ main(int argc, char **argv) #ifndef HAVE_LIBCRYPTO warning("crypto code not compiled in"); #endif - tcpmd5secret = optarg; + sigsecret = optarg; + break; + + case 'n': + ++nflag; + break; + + case 'N': + ++Nflag; break; case 'O': @@ -717,10 +763,10 @@ main(int argc, char **argv) snaplen = strtol(optarg, &end, 0); if (optarg == end || *end != '\0' - || snaplen < 0 || snaplen > 65535) + || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN) error("invalid snaplen %s", optarg); else if (snaplen == 0) - snaplen = 65535; + snaplen = MAXIMUM_SNAPLEN; break; } @@ -812,6 +858,15 @@ main(int argc, char **argv) } break; #endif + case 'z': + if (optarg) { + zflag = strdup(optarg); + } else { + usage(); + /* NOTREACHED */ + } + break; + case 'Z': if (optarg) { username = strdup(optarg); @@ -916,12 +971,74 @@ main(int argc, char **argv) fflush(stderr); #endif /* WIN32 */ +#ifdef HAVE_PCAP_CREATE + pd = pcap_create(device, ebuf); + if (pd == NULL) + error("%s", ebuf); + status = pcap_set_snaplen(pd, snaplen); + if (status != 0) + error("%s: pcap_set_snaplen failed: %s", + device, pcap_statustostr(status)); + status = pcap_set_promisc(pd, !pflag); + if (status != 0) + error("%s: pcap_set_promisc failed: %s", + device, pcap_statustostr(status)); + if (Iflag) { + status = pcap_set_rfmon(pd, 1); + if (status != 0) + error("%s: pcap_set_rfmon failed: %s", + device, pcap_statustostr(status)); + } + status = pcap_set_timeout(pd, 1000); + if (status != 0) + error("%s: pcap_set_timeout failed: %s", + device, pcap_statustostr(status)); + if (Bflag != 0) { + status = pcap_set_buffer_size(pd, Bflag); + if (status != 0) + error("%s: pcap_set_buffer_size failed: %s", + device, pcap_statustostr(status)); + } + status = pcap_activate(pd); + if (status < 0) { + /* + * pcap_activate() failed. + */ + cp = pcap_geterr(pd); + if (status == PCAP_ERROR) + error("%s", cp); + else if ((status == PCAP_ERROR_NO_SUCH_DEVICE || + status == PCAP_ERROR_PERM_DENIED) && + *cp != '\0') + error("%s: %s\n(%s)", device, + pcap_statustostr(status), cp); + else + error("%s: %s", device, + pcap_statustostr(status)); + } else if (status > 0) { + /* + * pcap_activate() succeeded, but it's warning us + * of a problem it had. + */ + cp = pcap_geterr(pd); + if (status == PCAP_WARNING) + warning("%s", cp); + else if (status == PCAP_WARNING_PROMISC_NOTSUP && + *cp != '\0') + warning("%s: %s\n(%s)", device, + pcap_statustostr(status), cp); + else + warning("%s: %s", device, + pcap_statustostr(status)); + } +#else *ebuf = '\0'; pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); if (pd == NULL) error("%s", ebuf); else if (*ebuf) warning("%s", ebuf); +#endif /* HAVE_PCAP_CREATE */ /* * Let user own process after socket has been opened. */ @@ -929,12 +1046,12 @@ main(int argc, char **argv) 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){ +#if !defined(HAVE_PCAP_CREATE) && defined(WIN32) + if(Bflag != 0) + if(pcap_setbuff(pd, Bflag)==-1){ error("%s", pcap_geterr(pd)); } -#endif /* WIN32 */ +#endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */ if (Lflag) show_dlts_and_exit(pd); if (gndo->ndo_dlt >= 0) { @@ -974,18 +1091,21 @@ main(int argc, char **argv) if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) error("%s", pcap_geterr(pd)); + free(cmdbuf); if (dflag) { bpf_dump(&fcode, dflag); pcap_close(pd); exit(0); } init_addrtoname(localnet, netmask); + init_checksum(); #ifndef WIN32 (void)setsignal(SIGPIPE, cleanup); -#endif /* WIN32 */ (void)setsignal(SIGTERM, cleanup); (void)setsignal(SIGINT, cleanup); + (void)setsignal(SIGCHLD, child_cleanup); +#endif /* WIN32 */ /* Cooperate with nohup(1) */ #ifndef WIN32 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL) @@ -997,19 +1117,18 @@ main(int argc, char **argv) if (WFileName) { pcap_dumper_t *p; /* Do not exceed the default NAME_MAX for files. */ - WFileNameAlt = (char *)malloc(NAME_MAX + 1); + dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1); - if (WFileNameAlt == NULL) - error("malloc of WFileNameAlt"); + 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(WFileNameAlt, WFileName, 0, WflagChars); + MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars); else - MakeFilename(WFileNameAlt, WFileName, 0, 0); + MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0); - p = pcap_dump_open(pd, WFileNameAlt); - free(WFileNameAlt); + p = pcap_dump_open(pd, dumpinfo.CurrentFileName); if (p == NULL) error("%s", pcap_geterr(pd)); if (Cflag != 0 || Gflag != 0) { @@ -1028,10 +1147,10 @@ main(int argc, char **argv) if (printinfo.printer == NULL) { gndo->ndo_dltname = pcap_datalink_val_to_name(type); if (gndo->ndo_dltname != NULL) - error("unsupported data link type %s", + error("packet printing is not supported for link type %s: use -w", gndo->ndo_dltname); else - error("unsupported data link type %d", type); + error("packet printing is not supported for link type %d: use -w", type); } callback = print_packet; pcap_userdata = (u_char *)&printinfo; @@ -1047,7 +1166,12 @@ main(int argc, char **argv) } #endif /* WIN32 */ #ifdef SIGINFO - (void)setsignal(SIGINFO, requestinfo); + /* + * We can't get statistics when reading from a file rather + * than capturing from a device. + */ + if (RFileName == NULL) + (void)setsignal(SIGINFO, requestinfo); #endif if (vflag > 0 && WFileName) { @@ -1165,13 +1289,31 @@ cleanup(int signo _U_) #endif } +/* + On windows, we do not use a fork, so we do not care less about + waiting a child processes to die + */ +#ifndef WIN32 +static RETSIGTYPE +child_cleanup(int signo _U_) +{ + wait(NULL); +} +#endif /* WIN32 */ + static void info(register int verbose) { 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; } @@ -1183,20 +1325,58 @@ info(register int verbose) fputs(", ", stderr); else putc('\n', stderr); - (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv); + (void)fprintf(stderr, "%u 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); + (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop); + if (stat.ps_ifdrop != 0) { + if (!verbose) + fputs(", ", stderr); + else + putc('\n', stderr); + (void)fprintf(stderr, "%u packets dropped by interface\n", + stat.ps_ifdrop); + } else + putc('\n', stderr); infoprint = 0; } +#ifndef WIN32 +static void +compress_savefile(const char *filename) +{ + if (fork()) + return; + /* + * Set to lowest priority so that this doesn't disturb the capture + */ +#ifdef NZERO + setpriority(PRIO_PROCESS, 0, NZERO - 1); +#else + setpriority(PRIO_PROCESS, 0, 19); +#endif + if (execlp(zflag, zflag, filename, (char *)NULL) == -1) + fprintf(stderr, + "compress_savefile:execlp(%s, %s): %s\n", + zflag, + filename, + strerror(errno)); +} +#else /* WIN32 */ +static void +compress_savefile(const char *filename) +{ + fprintf(stderr, + "compress_savefile failed. Functionality not implemented under windows\n"); +} +#endif /* WIN32 */ + static void dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) { struct dump_info *dump_info; - char *name; ++packets_captured; @@ -1234,6 +1414,12 @@ dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *s */ 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). @@ -1244,9 +1430,11 @@ dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *s exit(0); /* NOTREACHED */ } + if (dump_info->CurrentFileName != NULL) + free(dump_info->CurrentFileName); /* Allocate space for max filename + \0. */ - name = (char *)malloc(NAME_MAX + 1); - if (name == NULL) + dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1); + if (dump_info->CurrentFileName == NULL) error("dump_packet_and_trunc: malloc"); /* * This is always the first file in the Cflag @@ -1254,13 +1442,12 @@ dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *s * We also don't need numbering if Cflag is not set. */ if (Cflag != 0) - MakeFilename(name, dump_info->WFileName, 0, + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, WflagChars); else - MakeFilename(name, dump_info->WFileName, 0, 0); + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0); - dump_info->p = pcap_dump_open(dump_info->pd, name); - free(name); + dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); } @@ -1276,17 +1463,25 @@ dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *s * 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; } - name = (char *)malloc(NAME_MAX + 1); - if (name == NULL) + if (dump_info->CurrentFileName != NULL) + free(dump_info->CurrentFileName); + dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1); + if (dump_info->CurrentFileName == NULL) error("dump_packet_and_trunc: malloc"); - MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars); - dump_info->p = pcap_dump_open(dump_info->pd, name); - free(name); + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars); + dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); } @@ -1510,13 +1705,15 @@ usage(void) #endif /* WIN32 */ #endif /* HAVE_PCAP_LIB_VERSION */ (void)fprintf(stderr, -"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name); +"Usage: %s [-aAd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name); (void)fprintf(stderr, -"\t\t[ -E algo:secret ] [ -F file ] [ -G seconds ] [ -i interface ]\n"); +"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n"); (void)fprintf(stderr, -"\t\t[ -M secret ] [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n"); +"\t\t[ -i interface ] [ -M secret ] [ -r file ]\n"); (void)fprintf(stderr, -"\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n"); +"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n"); + (void)fprintf(stderr, +"\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n"); (void)fprintf(stderr, "\t\t[ expression ]\n"); exit(1); @@ -1559,4 +1756,3 @@ ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...) (void)fputc('\n', stderr); } } -