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tcpdump: Do not use signals and chroot

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Close #4649.
This commit is contained in:
Sebastian Huber 2022-05-11 08:09:03 +02:00
parent 45c9bd23a0
commit ea80d58015
1 changed files with 20 additions and 2 deletions
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22
freebsd/contrib/tcpdump/tcpdump.c
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@ -207,8 +207,10 @@ cap_channel_t *capdns;
static void error(FORMAT_STRING(const char *), ...) NORETURN PRINTFLIKE(1, 2);
static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
static void exit_tcpdump(int) NORETURN;
#ifndef __rtems__
static RETSIGTYPE cleanup(int);
static RETSIGTYPE child_cleanup(int);
#endif /* __rtems__ */
static void print_version(void);
static void print_usage(void);
static void show_tstamp_types_and_exit(pcap_t *, const char *device) NORETURN;
@ -220,6 +222,7 @@ static void show_devices_and_exit (void) NORETURN;
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 *);
#ifndef __rtems__
static void droproot(const char *, const char *);
#ifdef SIGNAL_REQ_INFO
@ -233,6 +236,7 @@ RETSIGTYPE requestinfo(int);
#elif defined(HAVE_ALARM)
static void verbose_stats_dump(int sig);
#endif
#endif /* __rtems__ */
static void info(int);
static u_int packets_captured;
@ -624,6 +628,7 @@ static const struct option longopts[] = {
{ NULL, 0, NULL, 0 }
};
#ifndef __rtems__
#ifndef _WIN32
/* Drop root privileges and chroot if necessary */
static void
@ -655,7 +660,6 @@ droproot(const char *username, const char *chroot_dir)
fprintf(stderr, "dropped privs to %s\n", username);
}
#else
#ifndef __rtems__
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
fprintf(stderr, "%s: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
@ -668,7 +672,6 @@ droproot(const char *username, const char *chroot_dir)
else {
fprintf(stderr, "dropped privs to %s\n", username);
}
#endif /* __rtems__ */
#endif /* HAVE_LIBCAP_NG */
}
else {
@ -690,6 +693,7 @@ droproot(const char *username, const char *chroot_dir)
}
#endif /* _WIN32 */
#endif /* __rtems__ */
static int
getWflagChars(int x)
@ -1294,15 +1298,19 @@ main(int argc, char **argv)
int dlt;
const char *dlt_name;
struct bpf_program fcode;
#ifndef __rtems__
#ifndef _WIN32
RETSIGTYPE (*oldhandler)(int);
#endif
#endif /* __rtems__ */
struct dump_info dumpinfo;
u_char *pcap_userdata;
char ebuf[PCAP_ERRBUF_SIZE];
char VFileLine[PATH_MAX + 1];
#ifndef __rtems__
char *username = NULL;
char *chroot_dir = NULL;
#endif /* __rtems__ */
char *ret = NULL;
char *end;
#ifdef HAVE_PCAP_FINDALLDEVS
@ -1674,9 +1682,11 @@ main(int argc, char **argv)
zflag = optarg;
break;
#ifndef __rtems__
case 'Z':
username = optarg;
break;
#endif /* __rtems__ */
case '#':
ndo->ndo_packet_number = 1;
@ -1973,6 +1983,7 @@ main(int argc, char **argv)
init_print(ndo, localnet, netmask, timezone_offset);
#ifndef __rtems__
#ifndef _WIN32
(void)setsignal(SIGPIPE, cleanup);
(void)setsignal(SIGTERM, cleanup);
@ -2040,6 +2051,7 @@ main(int argc, char **argv)
}
#endif /* _WIN32 */
#endif /* __rtems__ */
if (pcap_setfilter(pd, &fcode) < 0)
error("%s", pcap_geterr(pd));
@ -2147,6 +2159,7 @@ main(int argc, char **argv)
pcap_userdata = (u_char *)ndo;
}
#ifndef __rtems__
#ifdef SIGNAL_REQ_INFO
/*
* We can't get statistics when reading from a file rather
@ -2171,6 +2184,7 @@ main(int argc, char **argv)
alarm(1);
#endif
}
#endif /* __rtems__ */
if (RFileName == NULL) {
/*
@ -2344,6 +2358,7 @@ main(int argc, char **argv)
exit_tcpdump(status == -1 ? 1 : 0);
}
#ifndef __rtems__
/* make a clean exit on interrupts */
static RETSIGTYPE
cleanup(int signo _U_)
@ -2396,6 +2411,7 @@ child_cleanup(int signo _U_)
wait(NULL);
}
#endif /* HAVE_FORK && HAVE_VFORK */
#endif /* __rtems__ */
static void
info(register int verbose)
@ -2756,6 +2772,7 @@ print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
char Wpcap_version[]="3.1";
#endif
#ifndef __rtems__
#ifdef SIGNAL_REQ_INFO
RETSIGTYPE requestinfo(int signo _U_)
{
@ -2784,6 +2801,7 @@ static void verbose_stats_dump(int sig _U_)
alarm(1);
}
#endif
#endif /* __rtems__ */
USES_APPLE_DEPRECATED_API
static void