X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/b53994535a4f53c1411b6b37fdd1e40a21263bbc..ad06a893cfd3acca3fba38d8b39b6b15dd3053ea:/tcpdump.c diff --git a/tcpdump.c b/tcpdump.c index 75224e4c..e8a89fbe 100644 --- a/tcpdump.c +++ b/tcpdump.c @@ -30,7 +30,7 @@ static const char copyright[] = "@(#) 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[] = - "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.183 2002-08-06 04:36:12 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.201 2003-01-23 09:05:38 guy Exp $ (LBL)"; #endif /* @@ -62,17 +62,18 @@ extern int SIZE_BUF; #include #include - #include "interface.h" #include "addrtoname.h" #include "machdep.h" #include "setsignal.h" #include "gmt2local.h" +#include "pcap-missing.h" int aflag; /* translate network and broadcast addresses */ 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 */ @@ -82,19 +83,23 @@ 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; -int infodelay; -int infoprint; +static int infodelay; +static int infoprint; char *program_name; @@ -103,23 +108,33 @@ 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 dump_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *); +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); + /* Length of saved portion of packet. */ int snaplen = DEFAULT_SNAPLEN; +typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *); + struct printer { - pcap_handler f; + 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 @@ -174,11 +189,20 @@ static struct printer printers[] = { #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 { NULL, 0 }, }; -static pcap_handler +static if_printer lookup_printer(int type) { struct printer *p; @@ -187,7 +211,7 @@ lookup_printer(int type) if (type == p->type) return p->f; - error("unknown data link type %d", type); + return NULL; /* NOTREACHED */ } @@ -197,23 +221,88 @@ 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", dlt_name); + + /* + * 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 printer; + 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]; @@ -222,7 +311,6 @@ main(int argc, char **argv) int devnum; #endif #ifdef WIN32 - int ii; DWORD dwVersion; DWORD dwWindowsMajorVersion; u_int UserBufferSize=1000000; @@ -253,26 +341,18 @@ main(int argc, char **argv) opterr = 0; while ( -#ifdef WIN32 - (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) -#else /* WIN32 */ -#ifdef HAVE_PCAP_FINDALLDEVS - (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) -#else /* HAVE_PCAP_FINDALLDEVS */ - (op = getopt(argc, argv, "aAc:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) -#endif /* HAVE_PCAP_FINDALLDEVS */ -#endif /* WIN32 */ + (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': ++aflag; break; - case 'A': - ++xflag; - ++Xflag; - ++Aflag; - break; + case 'A': + ++xflag; + ++Xflag; + ++Aflag; + break; #ifdef WIN32 case 'B': @@ -314,6 +394,10 @@ main(int argc, char **argv) return 0; #endif /* HAVE_PCAP_FINDALLDEVS */ + case 'L': + Lflag++; + break; + case 'e': ++eflag; break; @@ -459,6 +543,12 @@ main(int argc, char **argv) ++uflag; break; +#ifdef HAVE_PCAP_DUMP_FLUSH + case 'U': + ++Uflag; + break; +#endif + case 'v': ++vflag; break; @@ -476,12 +566,24 @@ main(int argc, char **argv) ++Xflag; break; -#ifdef YYDEBUG + 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 @@ -520,21 +622,7 @@ main(int argc, char **argv) error("%s", ebuf); } #ifdef WIN32 - else - { - if (!(dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4)) /* Windows '95 */ - { - if(device[1]!=0) - device=(char*)SChar2WChar(device); - } - else{ - for (ii=0;ii<(signed)strlen(device);ii++) - for (ii=strlen(device)-1;ii>0&&(device[ii]==' '||device[ii]=='\t');ii--)device[ii]='\0'; - for (ii=0;ii<(signed)strlen(device)&&(device[ii]==' '||device[ii]=='\t');ii++); - strcpy(device,device+ii); - } - } - PrintCapBegins (program_name,device); + PrintCapBegins(program_name,device); #endif /* WIN32 */ *ebuf = '\0'; pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); @@ -548,6 +636,27 @@ main(int argc, char **argv) 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); @@ -594,30 +703,45 @@ main(int argc, char **argv) if (p == NULL) error("%s", pcap_geterr(pd)); if (Cflag != 0) { - printer = dump_and_trunc; + callback = dump_packet_and_trunc; dumpinfo.WFileName = WFileName; dumpinfo.pd = pd; dumpinfo.p = p; pcap_userdata = (u_char *)&dumpinfo; } else { - printer = pcap_dump; + callback = dump_packet; pcap_userdata = (u_char *)p; } } else { - printer = lookup_printer(pcap_datalink(pd)); - pcap_userdata = 0; + 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); + (void)setsignal(SIGINFO, requestinfo); #endif - } #ifndef WIN32 if (RFileName == NULL) { - (void)fprintf(stderr, "%s: listening on %s\n", - program_name, device); + 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); + (void)fprintf(stderr, "listening on %s, capture size %u bytes\n", + device, snaplen); (void)fflush(stderr); } #endif /* WIN32 */ - if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) { + if (pcap_loop(pd, cnt, callback, pcap_userdata) < 0) { (void)fprintf(stderr, "%s: pcap_loop: %s\n", program_name, pcap_geterr(pd)); cleanup(0); @@ -645,7 +769,7 @@ cleanup(int signo) exit(0); } -void +static void info(register int verbose) { struct pcap_stat stat; @@ -695,34 +819,107 @@ swebitoa(unsigned int n, char *s) } static void -dump_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) +dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) { - struct dump_info *info; + struct dump_info *dump_info; static uint cnt = 2; char *name; - info = (struct dump_info *)user; + ++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 *)info->p) > Cflag) { - name = (char *) malloc(strlen(info->WFileName) + 4); + if (ftell((FILE *)dump_info->p) > Cflag) { + name = (char *) malloc(strlen(dump_info->WFileName) + 4); if (name == NULL) - error("dump_and_trunc: malloc"); - strcpy(name, info->WFileName); - swebitoa(cnt, name + strlen(info->WFileName)); + error("dump_packet_and_trunc: malloc"); + strcpy(name, dump_info->WFileName); + swebitoa(cnt, name + strlen(dump_info->WFileName)); cnt++; - pcap_dump_close(info->p); - info->p = pcap_dump_open(info->pd, name); + pcap_dump_close(dump_info->p); + dump_info->p = pcap_dump_open(dump_info->pd, name); free(name); - if (info->p == NULL) + if (dump_info->p == NULL) error("%s", pcap_geterr(pd)); } - pcap_dump((u_char *)info->p, h, sp); + 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) +{ + ++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; + + ++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_unaligned(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_unaligned(sp + hdrlen, + h->caplen - hdrlen); + } + } + + putchar('\n'); + + --infodelay; + if (infoprint) + info(0); } /* Like default_print() but data need not be aligned */ @@ -777,7 +974,7 @@ default_print_unaligned(register const u_char *cp, register u_int length) #endif /* - * By default, print the packet out in hex. + * By default, print the specified data out in hex. */ void default_print(register const u_char *bp, register u_int length) @@ -786,7 +983,7 @@ default_print(register const u_char *bp, register u_int length) } #ifdef SIGINFO -RETSIGTYPE requestinfo(int signo) +RETSIGTYPE requestinfo(int signo _U_) { if (infodelay) ++infoprint; @@ -799,7 +996,11 @@ static void usage(void) { extern char version[]; +#if defined(WIN32) || defined(HAVE_PCAP_VERSION) extern char pcap_version[]; +#else + static char pcap_version[] = "unknown"; +#endif #ifdef WIN32 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); @@ -809,18 +1010,12 @@ usage(void) (void)fprintf(stderr, "libpcap version %s\n", pcap_version); #endif /* WIN32 */ (void)fprintf(stderr, -#ifdef WIN32 -"Usage: %s [-aAdDeflnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name); -#else /* WIN32 */ -#ifdef HAVE_PCAP_FINDALLDEVS -"Usage: %s [-aAdDeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name); -#else /* HAVE_PCAP_FINDALLDEVS */ -"Usage: %s [-aAdeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name); -#endif /* HAVE_PCAP_FINDALLDEVS */ -#endif /* WIN32 */ +"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[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n"); +"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n"); (void)fprintf(stderr, -"\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n"); +"\t\t[ expression ]\n"); exit(1); }