X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fnc.c;h=63d8c5b19db9b70b8f16527ac4a3f6e8ed7b5104;hb=9bf9f1edbec05edbf566c3220835440e1b18fcc8;hp=eb6e17762fdc0f85ade75cd7013b6fe3e0dd0f30;hpb=24be980004598c2fa0a3e14ccdce0bc7b3039985;p=oweals%2Fbusybox.git

diff --git a/networking/nc.c b/networking/nc.c
index eb6e17762..63d8c5b19 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -26,13 +26,9 @@
 
 */
 
-#warning This applet has moved to netkit-tiny.  After BusyBox 0.49, this
-#warning applet will be removed from BusyBox.  All maintenance efforts
-#warning should be done in the netkit-tiny source tree.
-
-#include "busybox.h"
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <sys/types.h>
@@ -42,35 +38,104 @@
 #include <netdb.h>
 #include <sys/time.h>
 #include <sys/ioctl.h>
+#include "busybox.h"
+
+#define GAPING_SECURITY_HOLE
 
 int nc_main(int argc, char **argv)
 {
-	int sfd;
+	int do_listen = 0, lport = 0, delay = 0, tmpfd, opt, sfd, x;
 	char buf[BUFSIZ];
+#ifdef GAPING_SECURITY_HOLE
+	char * pr00gie = NULL;                  
+#endif
 
 	struct sockaddr_in address;
 	struct hostent *hostinfo;
 
 	fd_set readfds, testfds;
 
-	argc--;
-	argv++;
-	if (argc < 2 || **argv == '-') {
-		usage(nc_usage);
+	while ((opt = getopt(argc, argv, "lp:i:e:")) > 0) {
+		switch (opt) {
+			case 'l':
+				do_listen++;
+				break;
+			case 'p':
+				lport = atoi(optarg);
+				break;
+			case 'i':
+				delay = atoi(optarg);
+				break;
+#ifdef GAPING_SECURITY_HOLE
+			case 'e':
+				pr00gie = optarg;
+				break;
+#endif
+			default:
+				show_usage();
+		}
 	}
 
+#ifdef GAPING_SECURITY_HOLE
+	if (pr00gie) {
+		/* won't need stdin */
+		close (fileno(stdin));                          
+	}
+#endif /* GAPING_SECURITY_HOLE */
+
+
+	if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
+		show_usage();
+
 	if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
 		perror_msg_and_die("socket");
+	x = 1;
+	if (setsockopt (sfd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof (x)) == -1)
+		perror_msg_and_die ("reuseaddr failed");
+	address.sin_family = AF_INET;
 
-	if ((hostinfo = gethostbyname(*argv)) == NULL)
-		error_msg_and_die("cannot resolve %s\n", *argv);
+	if (lport != 0) {
+		memset(&address.sin_addr, 0, sizeof(address.sin_addr));
+		address.sin_port = htons(lport);
 
-	address.sin_family = AF_INET;
-	address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
-	address.sin_port = htons(atoi(*(++argv)));
+		if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
+			perror_msg_and_die("bind");
+	}
+
+	if (do_listen) {
+		socklen_t addrlen = sizeof(address);
+
+		if (listen(sfd, 1) < 0)
+			perror_msg_and_die("listen");
+
+		if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
+			perror_msg_and_die("accept");
+
+		close(sfd);
+		sfd = tmpfd;
+	} else {
+		hostinfo = xgethostbyname(argv[optind]);
+
+		address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
+		address.sin_port = htons(atoi(argv[optind+1]));
+
+		if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
+			perror_msg_and_die("connect");
+	}
+
+#ifdef GAPING_SECURITY_HOLE
+	/* -e given? */
+	if (pr00gie) {
+		dup2(sfd, 0);
+		close(sfd);
+		dup2 (0, 1);
+		dup2 (0, 2);
+		execl (pr00gie, pr00gie, NULL);
+		/* Don't print stuff or it will go over the wire.... */
+		_exit(-1);
+	}
+#endif /* GAPING_SECURITY_HOLE */
 
-	if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
-		perror_msg_and_die("connect");
 
 	FD_ZERO(&readfds);
 	FD_SET(sfd, &readfds);
@@ -103,6 +168,9 @@ int nc_main(int argc, char **argv)
 
 				if (full_write(ofd, buf, nread) < 0)
 					perror_msg_and_die("write");
+				if (delay > 0) {
+					sleep(delay);
+				}
 			}
 		}
 	}