X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/0b0438f3912b3f00de73adae25b37ab7015e5778..4bec97f457e593be925e92fa28d73af6a57d81cf:/tcpdump.c diff --git a/tcpdump.c b/tcpdump.c index 5437cee7..a4dde2f3 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 1.182 2002-08-03 23:16:57 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.193 2002-12-19 09:39:17 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 */ @@ -88,13 +89,16 @@ 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; @@ -103,18 +107,25 @@ 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; }; @@ -174,11 +185,20 @@ 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 +207,7 @@ lookup_printer(int type) if (type == p->type) return p->f; - error("unknown data link type %d", type); + return NULL; /* NOTREACHED */ } @@ -197,23 +217,64 @@ 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); +} + 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 +283,6 @@ main(int argc, char **argv) int devnum; #endif #ifdef WIN32 - int ii; DWORD dwVersion; DWORD dwWindowsMajorVersion; u_int UserBufferSize=1000000; @@ -254,12 +314,12 @@ main(int argc, char **argv) opterr = 0; while ( #ifdef WIN32 - (op = getopt(argc, argv, "aB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) + (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lLm:nNOpqr:Rs:StT:uvw:xXy:Y")) != -1) #else /* WIN32 */ #ifdef HAVE_PCAP_FINDALLDEVS - (op = getopt(argc, argv, "ac:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) + (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lLm:nNOpqr:Rs:StT:uvw:xXy:Y")) != -1) #else /* HAVE_PCAP_FINDALLDEVS */ - (op = getopt(argc, argv, "ac:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1) + (op = getopt(argc, argv, "aAc:C:deE:fF:i:lLm:nNOpqr:Rs:StT:uvw:xXy:Y")) != -1) #endif /* HAVE_PCAP_FINDALLDEVS */ #endif /* WIN32 */ switch (op) { @@ -268,11 +328,11 @@ main(int argc, char **argv) ++aflag; break; - case 'A': - ++xflag; - ++Xflag; - ++Aflag; - break; + case 'A': + ++xflag; + ++Xflag; + ++Aflag; + break; #ifdef WIN32 case 'B': @@ -314,6 +374,10 @@ main(int argc, char **argv) return 0; #endif /* HAVE_PCAP_FINDALLDEVS */ + case 'L': + Lflag++; + break; + case 'e': ++eflag; break; @@ -476,12 +540,24 @@ 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 +596,7 @@ 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 +610,27 @@ 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); @@ -574,9 +657,7 @@ main(int argc, char **argv) error("%s", pcap_geterr(pd)); if (dflag) { bpf_dump(&fcode, dflag); -#ifdef WIN32 - pcap_close(pd); -#endif /* WIN32 */ + pcap_close(pd); exit(0); } init_addrtoname(localnet, netmask); @@ -596,22 +677,31 @@ 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", @@ -619,7 +709,7 @@ main(int argc, char **argv) (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); @@ -647,7 +737,7 @@ cleanup(int signo) exit(0); } -void +static void info(register int verbose) { struct pcap_stat stat; @@ -697,34 +787,99 @@ 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); + + --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); + + --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 */ @@ -754,6 +909,24 @@ default_print_unaligned(register const u_char *cp, register u_int length) } #ifdef WIN32 + /* + * XXX - there should really be libpcap calls to get the version + * number as a string (the string would be generated from #defines + * at run time, so that it's not generated from string constants + * in the library, as, on many UNIX systems, those constants would + * be statically linked into the application executable image, and + * would thus reflect the version of libpcap on the system on + * which the application was *linked*, not the system on which it's + * *running*. + * + * That routine should be documented, unlike the "version[]" + * string, so that UNIX vendors providing their own libpcaps + * don't omit it (as a couple of vendors have...). + * + * Packet.dll should perhaps also export a routine to return the + * version number of the Packet.dll code, to supply the + * "Wpcap_version" information on Windows. + */ char WDversion[]="current-cvs.tcpdump.org"; char version[]="current-cvs.tcpdump.org"; char pcap_version[]="current-cvs.tcpdump.org"; @@ -761,7 +934,7 @@ 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) @@ -770,7 +943,7 @@ 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; @@ -783,7 +956,11 @@ 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); @@ -794,17 +971,19 @@ usage(void) #endif /* WIN32 */ (void)fprintf(stderr, #ifdef WIN32 -"Usage: %s [-adDeflnNOpqStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name); +"Usage: %s [-aAdDeflLnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name); #else /* WIN32 */ #ifdef HAVE_PCAP_FINDALLDEVS -"Usage: %s [-adDeflnNOpqStuvxX] [-c count] [ -C file_size ]\n", program_name); +"Usage: %s [-aAdDeflLnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name); #else /* HAVE_PCAP_FINDALLDEVS */ -"Usage: %s [-adeflnNOpqStuvxX] [-c count] [ -C file_size ]\n", program_name); +"Usage: %s [-aAdeflLnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name); #endif /* HAVE_PCAP_FINDALLDEVS */ #endif /* WIN32 */ (void)fprintf(stderr, -"\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n"); +"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n"); + (void)fprintf(stderr, +"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n"); (void)fprintf(stderr, -"\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n"); +"\t\t[ expression ]\n"); exit(1); }