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make the exec (-e) an optional feature of netcat

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This commit is contained in:
Mike Frysinger 2005-05-06 05:00:34 +00:00
parent 60a5c38a4b
commit 7dc7f402a7
3 changed files with 28 additions and 18 deletions
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11
include/usage.h
View File

@ -1824,6 +1824,11 @@
" or\n" \ " or\n" \
"$ nameif -c /etc/my_mactab_file\n" \ "$ nameif -c /etc/my_mactab_file\n" \
#ifdef CONFIG_NC_GAPING_SECURITY_HOLE
# define USAGE_NC_EXEC(a) a
#else
# define USAGE_NC_EXEC(a)
#endif
#define nc_trivial_usage \ #define nc_trivial_usage \
"[OPTIONS] [IP] [port]" "[OPTIONS] [IP] [port]"
#define nc_full_usage \ #define nc_full_usage \
@ -1832,8 +1837,10 @@
"\t-l\t\tlisten mode, for inbound connects\n" \ "\t-l\t\tlisten mode, for inbound connects\n" \
"\t-p PORT\t\tlocal port number\n" \ "\t-p PORT\t\tlocal port number\n" \
"\t-i SECS\t\tdelay interval for lines sent\n" \ "\t-i SECS\t\tdelay interval for lines sent\n" \
"\t-w SECS\t\ttimeout for connects and final net reads\n" \ USAGE_NC_EXEC( \
"\t-e PROG\t\tprogram to exec after connect (dangerous!)" "\t-e PROG\t\tprogram to exec after connect (dangerous!)\n" \
) \
"\t-w SECS\t\ttimeout for connects and final net reads"
#define nc_example_usage \ #define nc_example_usage \
"$ nc foobar.somedomain.com 25\n" \ "$ nc foobar.somedomain.com 25\n" \
"220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600\n" \ "220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600\n" \

8
networking/Config.in
View File

@ -422,6 +422,14 @@ config CONFIG_NC
A simple Unix utility which reads and writes data across network A simple Unix utility which reads and writes data across network
connections. connections.
config CONFIG_NC_GAPING_SECURITY_HOLE
bool "gaping security hole"
default n
depends on CONFIG_NC
help
Add support for executing a program after making or receiving a
successful connection (-e option).
config CONFIG_NETSTAT config CONFIG_NETSTAT
bool "netstat" bool "netstat"
default n default n

17
networking/nc.c
View File

@ -23,7 +23,6 @@
You should have received a copy of the GNU General Public License You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/ */
#include <stdio.h> #include <stdio.h>
@ -41,8 +40,6 @@
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include "busybox.h" #include "busybox.h"
#define GAPING_SECURITY_HOLE
static void timeout(int signum) static void timeout(int signum)
{ {
bb_error_msg_and_die("Timed out"); bb_error_msg_and_die("Timed out");
@ -52,7 +49,7 @@ int nc_main(int argc, char **argv)
{ {
int do_listen = 0, lport = 0, delay = 0, wsecs = 0, tmpfd, opt, sfd, x; int do_listen = 0, lport = 0, delay = 0, wsecs = 0, tmpfd, opt, sfd, x;
char buf[BUFSIZ]; char buf[BUFSIZ];
#ifdef GAPING_SECURITY_HOLE #ifdef CONFIG_NC_GAPING_SECURITY_HOLE
char *pr00gie = NULL; char *pr00gie = NULL;
#endif #endif
@ -72,7 +69,7 @@ int nc_main(int argc, char **argv)
case 'i': case 'i':
delay = atoi(optarg); delay = atoi(optarg);
break; break;
#ifdef GAPING_SECURITY_HOLE #ifdef CONFIG_NC_GAPING_SECURITY_HOLE
case 'e': case 'e':
pr00gie = optarg; pr00gie = optarg;
break; break;
@ -85,13 +82,12 @@ int nc_main(int argc, char **argv)
} }
} }
#ifdef GAPING_SECURITY_HOLE #ifdef CONFIG_NC_GAPING_SECURITY_HOLE
if (pr00gie) { if (pr00gie) {
/* won't need stdin */ /* won't need stdin */
close (STDIN_FILENO); close (STDIN_FILENO);
} }
#endif /* GAPING_SECURITY_HOLE */ #endif /* CONFIG_NC_GAPING_SECURITY_HOLE */
if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc)) if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
bb_show_usage(); bb_show_usage();
@ -142,7 +138,7 @@ int nc_main(int argc, char **argv)
signal(SIGALRM, SIG_DFL); signal(SIGALRM, SIG_DFL);
} }
#ifdef GAPING_SECURITY_HOLE #ifdef CONFIG_NC_GAPING_SECURITY_HOLE
/* -e given? */ /* -e given? */
if (pr00gie) { if (pr00gie) {
dup2(sfd, 0); dup2(sfd, 0);
@ -153,8 +149,7 @@ int nc_main(int argc, char **argv)
/* Don't print stuff or it will go over the wire.... */ /* Don't print stuff or it will go over the wire.... */
_exit(-1); _exit(-1);
} }
#endif /* GAPING_SECURITY_HOLE */ #endif /* CONFIG_NC_GAPING_SECURITY_HOLE */
FD_ZERO(&readfds); FD_ZERO(&readfds);
FD_SET(sfd, &readfds); FD_SET(sfd, &readfds);