#include <grp.h>
#endif /* WIN32 */
-/* capabilities convinience library */
+/* 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 <cap-ng.h>
+#else
+#undef HAVE_LIBCAP_NG
#endif /* HAVE_CAP_NG_H */
+#endif /* HAVE_LIBCAP_NG */
#include "netdissect.h"
#include "interface.h"
*/
#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)
{ "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
exit(1);
}
}
-#ifdef HAVE_CAP_NG_H
+#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 {
- printf("dropped privs to %s\n", username);
+ fprintf(stderr, "dropped privs to %s\n", username);
}
- /* We don't need CAP_SETUID and CAP_SETGID */
- capng_updatev(
- CAPNG_DROP,
- CAPNG_EFFECTIVE | CAPNG_PERMITTED,
- CAP_SETUID,
- CAP_SETGID,
- -1);
- 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) {
exit(1);
}
else {
- printf("dropped privs to %s\n", username);
+ fprintf(stderr, "dropped privs to %s\n", username);
}
-#endif /* HAVE_CAP_NG_H */
+#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 */
gndo->ndo_error=ndo_error;
gndo->ndo_warning=ndo_warning;
gndo->ndo_snaplen = DEFAULT_SNAPLEN;
+ gndo->ndo_immediate = 0;
cnt = -1;
device = NULL;
break;
#endif
+#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
+ case OPTION_IMMEDIATE_MODE:
+ gndo->ndo_immediate = 1;
+ break;
+#endif
+
default:
print_usage();
exit(1);
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) {
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?
*/
status = pcap_set_tstamp_type(pd, jflag);
if (status < 0)
error("%s: Can't set time stamp type: %s",
- device, pcap_statustostr(status));
+ device, pcap_statustostr(status));
}
#endif
status = pcap_activate(pd);
*/
if (getuid() == 0 || geteuid() == 0) {
-#ifdef HAVE_CAP_NG_H
- /* Drop all capabilities from effective set */
- capng_clear(CAPNG_EFFECTIVE);
- /* We are running as root and we will be writing to savefile */
- if (WFileName && username) {
- /* Add capabilities we will need*/
+#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,
- CAP_DAC_OVERRIDE,
-1);
- capng_apply(CAPNG_SELECT_BOTH);
}
-#endif /* HAVE_CAP_NG_H */
+
+ 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);
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
+#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 HAVE_CAPSICUM
else
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
-#ifdef HAVE_CAP_NG_H
+#ifdef HAVE_LIBCAP_NG
capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
- capng_apply(CAPNG_EFFECTIVE);
-#endif /* HAVE_CAP_NG_H */
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
#ifdef HAVE_CAPSICUM
fd = openat(dump_info->dirfd,
dump_info->CurrentFileName,
#else /* !HAVE_CAPSICUM */
dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
#endif
-#ifdef HAVE_CAP_NG_H
+#ifdef HAVE_LIBCAP_NG
capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
- capng_apply(CAPNG_EFFECTIVE);
-#endif /* HAVE_CAP_NG_H */
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
if (dump_info->p == NULL)
error("%s", pcap_geterr(pd));
#ifdef HAVE_CAPSICUM
* larger than Cflag - the last packet written to the
* file could put it over Cflag.
*/
- if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > 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 HAVE_CAPSICUM
- FILE *fp;
- int fd;
+ FILE *fp;
+ int fd;
#endif
- /*
- * Close the current file and open a new one.
- */
- pcap_dump_close(dump_info->p);
+ /*
+ * 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);
+ /*
+ * 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);
+ 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 HAVE_CAPSICUM
- 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);
+ 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 /* !HAVE_CAPSICUM */
- dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
#endif
- if (dump_info->p == NULL)
- error("%s", pcap_geterr(pd));
+#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 HAVE_CAPSICUM
- cap_rights_init(&rights, CAP_SEEK, CAP_WRITE);
- if (cap_rights_limit(fileno(pcap_dump_file(dump_info->p)),
- &rights) < 0 && errno != ENOSYS) {
- error("unable to limit dump descriptor");
- }
+ cap_rights_init(&rights, CAP_SEEK, CAP_WRITE);
+ if (cap_rights_limit(fileno(pcap_dump_file(dump_info->p)),
+ &rights) < 0 && errno != ENOSYS) {
+ error("unable to limit dump descriptor");
+ }
#endif
+ }
}
pcap_dump((u_char *)dump_info->p, h, sp);
(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,
projects / tcpdump / blobdiff