#include <errno.h>
#endif /* WIN32 */
+/* capabilities convinience library */
+#ifdef HAVE_CAP_NG_H
+#include <cap-ng.h>
+#endif /* HAVE_CAP_NG_H */
#include "netdissect.h"
#include "interface.h"
#define NAME_MAX 255
#endif
+#ifdef SIGINFO
+#define SIGNAL_REQ_INFO SIGINFO
+#elif SIGUSR1
+#define SIGNAL_REQ_INFO SIGUSR1
+#endif
+
netdissect_options Gndo;
netdissect_options *gndo = &Gndo;
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, ...);
+static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
+ __attribute__ ((noreturn, format (printf, 2, 3)));
static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
-#ifdef SIGINFO
+#ifdef SIGNAL_REQ_INFO
RETSIGTYPE requestinfo(int);
#endif
static void info(int);
static u_int packets_captured;
-typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
-typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
- const struct pcap_pkthdr *, const u_char *);
-
struct printer {
if_printer f;
int type;
#ifdef DLT_ARCNET_LINUX
{ arcnet_linux_if_print, DLT_ARCNET_LINUX },
#endif
- { ether_if_print, DLT_EN10MB },
{ token_if_print, DLT_IEEE802 },
#ifdef DLT_LANE8023
{ lane_if_print, DLT_LANE8023 },
};
static 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
{ NULL, 0 },
};
-static if_printer
+if_printer
lookup_printer(int type)
{
struct printer *p;
/* NOTREACHED */
}
-static if_ndo_printer
+if_ndo_printer
lookup_ndo_printer(int type)
{
struct ndo_printer *p;
dlts[n_dlts]);
}
}
+#ifdef HAVE_PCAP_FREE_DATALINKS
pcap_free_datalinks(dlts);
+#endif
exit(0);
}
exit(1);
}
}
+#ifdef HAVE_CAP_NG_H
+ int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
+ if (ret < 0) {
+ printf("error : ret %d\n", ret);
+ }
+ /* We don't need CAP_SETUID and CAP_SETGID */
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
+ capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
+ capng_apply(CAPNG_SELECT_BOTH);
+
+#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",
pcap_strerror(errno));
exit(1);
}
+#endif /* HAVE_CAP_NG_H */
}
else {
fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
return ret;
}
+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);
+}
+
+char *get_next_file(FILE *VFile, char *ptr) {
+ char *ret;
+
+ ret = fgets(ptr, NAME_MAX, VFile);
+ if (!ret)
+ return NULL;
+
+ if (ptr[strlen(ptr) - 1] == '\n')
+ ptr[strlen(ptr) - 1] = '\0';
+
+ return ret;
+}
+
int
main(int argc, char **argv)
{
register int cnt, op, i;
bpf_u_int32 localnet, netmask;
- register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
+ 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);
struct dump_info dumpinfo;
u_char *pcap_userdata;
char ebuf[PCAP_ERRBUF_SIZE];
+ char VFileLine[NAME_MAX + 1];
char *username = NULL;
char *chroot_dir = NULL;
+ char *ret = NULL;
#ifdef HAVE_PCAP_FINDALLDEVS
pcap_if_t *devpointer;
int devnum;
#endif
int status;
+ FILE *VFile;
#ifdef WIN32
if(wsockinit() != 0) return 1;
#endif /* WIN32 */
device = NULL;
infile = NULL;
RFileName = NULL;
+ VFileName = NULL;
WFileName = NULL;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
smiInit("tcpdump");
#endif
- opterr = 0;
while (
- (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
+ (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
switch (op) {
case 'a':
break;
case 'h':
- ++hflag;
+ usage();
+ break;
+
+ case 'H':
+ ++Hflag;
break;
case 'i':
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
error("unknown packet type `%s'", optarg);
break;
++vflag;
break;
+ case 'V':
+ VFileName = optarg;
+ break;
+
case 'w':
WFileName = optarg;
break;
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 WITH_CHROOT
/* if run as root, prepare for chrooting */
if (getuid() == 0 || geteuid() == 0) {
}
#endif
- if (RFileName != NULL) {
- int dlt;
- const char *dlt_name;
-
+ if (RFileName != NULL || VFileName != NULL) {
#ifndef WIN32
/*
* We don't need network access, so relinquish any set-UID
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;
+ }
+
pd = pcap_open_offline(RFileName, ebuf);
if (pd == NULL)
error("%s", ebuf);
}
localnet = 0;
netmask = 0;
- if (fflag != 0)
- error("-f and -r options are incompatible");
} else {
if (device == NULL) {
device = pcap_lookupdev(ebuf);
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);
+ free(cmdbuf);
exit(0);
}
init_addrtoname(localnet, netmask);
(void)setsignal(SIGPIPE, cleanup);
(void)setsignal(SIGTERM, cleanup);
(void)setsignal(SIGINT, cleanup);
- (void)setsignal(SIGCHLD, child_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.
+ */
+
+#ifdef HAVE_CAP_NG_H
+ /* We are running as root and we will be writing to savefile */
+ if ((getuid() == 0 || geteuid() == 0) && WFileName) {
+ if (username) {
+ /* Drop all capabilities from effective set */
+ capng_clear(CAPNG_EFFECTIVE);
+ /* Add capabilities we will need*/
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
+ capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
+
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+
+ capng_apply(CAPNG_SELECT_BOTH);
+ }
+ }
+#endif /* HAVE_CAP_NG_H */
+
+ if (getuid() == 0 || geteuid() == 0) {
+ if (username || chroot_dir)
+ droproot(username, chroot_dir);
+
+ }
+#endif /* WIN32 */
+
if (pcap_setfilter(pd, &fcode) < 0)
error("%s", pcap_geterr(pd));
if (WFileName) {
MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
+#ifdef HAVE_CAP_NG_H
+ /* Give up capabilities, clear Effective set */
+ capng_clear(CAPNG_EFFECTIVE);
+#endif
if (p == NULL)
error("%s", pcap_geterr(pd));
if (Cflag != 0 || Gflag != 0) {
#endif
} else {
type = pcap_datalink(pd);
- 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);
- }
- }
+ printinfo = get_print_info(type);
callback = print_packet;
pcap_userdata = (u_char *)&printinfo;
}
-#ifndef WIN32
- /*
- * We cannot do this earlier, because we want to be able to open
- * the file (if done) for writing before giving up permissions.
- */
- if (getuid() == 0 || geteuid() == 0) {
- if (username || chroot_dir)
- droproot(username, chroot_dir);
- }
-#endif /* WIN32 */
-#ifdef SIGINFO
+
+#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(SIGINFO, requestinfo);
+ (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
#endif
if (vflag > 0 && WFileName) {
#ifndef WIN32
if (RFileName == NULL) {
- int dlt;
- const char *dlt_name;
-
if (!vflag && !WFileName) {
(void)fprintf(stderr,
"%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
(void)fflush(stderr);
}
#endif /* WIN32 */
- status = pcap_loop(pd, cnt, callback, pcap_userdata);
- if (WFileName == NULL) {
- /*
- * We're printing packets. Flush the printed output,
- * so it doesn't get intermingled with error output.
- */
- if (status == -2) {
+ do {
+ status = pcap_loop(pd, cnt, callback, pcap_userdata);
+ if (WFileName == NULL) {
/*
- * We got interrupted, so perhaps we didn't
- * manage to finish a line we were printing.
- * Print an extra newline, just in case.
+ * We're printing packets. Flush the printed output,
+ * so it doesn't get intermingled with error output.
*/
- putchar('\n');
+ if (status == -2) {
+ /*
+ * We got interrupted, so perhaps we didn't
+ * manage to finish a line we were printing.
+ * Print an extra newline, just in case.
+ */
+ putchar('\n');
+ }
+ (void)fflush(stdout);
+ }
+ if (status == -1) {
+ /*
+ * Error. Report it.
+ */
+ (void)fprintf(stderr, "%s: pcap_loop: %s\n",
+ program_name, pcap_geterr(pd));
+ }
+ if (RFileName == NULL) {
+ /*
+ * We're doing a live capture. Report the capture
+ * statistics.
+ */
+ info(1);
+ }
+ pcap_close(pd);
+ 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);
+ 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));
+ }
}
- (void)fflush(stdout);
- }
- if (status == -1) {
- /*
- * Error. Report it.
- */
- (void)fprintf(stderr, "%s: pcap_loop: %s\n",
- program_name, pcap_geterr(pd));
- }
- if (RFileName == NULL) {
- /*
- * We're doing a live capture. Report the capture
- * statistics.
- */
- info(1);
}
- pcap_close(pd);
+ while (ret != NULL);
+
+ free(cmdbuf);
exit(status == -1 ? 1 : 0);
}
On windows, we do not use a fork, so we do not care less about
waiting a child processes to die
*/
-#ifndef WIN32
+#if defined(HAVE_FORK) || defined(HAVE_VFORK)
static RETSIGTYPE
child_cleanup(int signo _U_)
{
wait(NULL);
}
-#endif /* WIN32 */
+#endif /* HAVE_FORK && HAVE_VFORK */
static void
info(register int verbose)
if (!verbose)
fprintf(stderr, "%s: ", program_name);
- (void)fprintf(stderr, "%u packets captured", packets_captured);
+ (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 packets received by filter", stat.ps_recv);
+ (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 packets dropped by kernel", stat.ps_drop);
+ (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 packets dropped by interface\n",
- stat.ps_ifdrop);
+ (void)fprintf(stderr, "%u packet%s dropped by interface\n",
+ stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
} else
putc('\n', stderr);
infoprint = 0;
}
-#ifndef WIN32
+#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
zflag,
filename,
strerror(errno));
+# ifdef HAVE_FORK
+ exit(1);
+# else
+ _exit(1);
+# endif
}
-#else /* WIN32 */
+#else /* HAVE_FORK && HAVE_VFORK */
static void
compress_savefile(const char *filename)
{
fprintf(stderr,
- "compress_savefile failed. Functionality not implemented under windows\n");
+ "compress_savefile failed. Functionality not implemented under your system\n");
}
-#endif /* WIN32 */
+#endif /* HAVE_FORK && HAVE_VFORK */
static void
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
else
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
+#ifdef HAVE_CAP_NG_H
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_EFFECTIVE);
+#endif /* HAVE_CAP_NG_H */
dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+#ifdef HAVE_CAP_NG_H
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_EFFECTIVE);
+#endif /* HAVE_CAP_NG_H */
if (dump_info->p == NULL)
error("%s", pcap_geterr(pd));
}
ndo_default_print(gndo, bp, length);
}
-#ifdef SIGINFO
+#ifdef SIGNAL_REQ_INFO
RETSIGTYPE requestinfo(int signo _U_)
{
if (infodelay)
#endif /* WIN32 */
#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
-"Usage: %s [-aAbd" D_FLAG "ef" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
+"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 ]\n");
(void)fprintf(stderr,
-"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
+"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
(void)fprintf(stderr,
"\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
(void)fprintf(stderr,
projects / tcpdump / blobdiff