X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fnc.c;h=63d8c5b19db9b70b8f16527ac4a3f6e8ed7b5104;hb=9bf9f1edbec05edbf566c3220835440e1b18fcc8;hp=fcacb0c45b45231f634fdc6317475dadf2a6e668;hpb=3570a34de46b1f7dedd16999bb1687e2d6b55d40;p=oweals%2Fbusybox.git

diff --git a/networking/nc.c b/networking/nc.c
index fcacb0c45..63d8c5b19 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -25,9 +25,10 @@
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 */
-#include "busybox.h"
+
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <sys/types.h>
@@ -37,51 +38,108 @@
 #include <netdb.h>
 #include <sys/time.h>
 #include <sys/ioctl.h>
+#include "busybox.h"
 
-#define BUFSIZE 100
+#define GAPING_SECURITY_HOLE
 
 int nc_main(int argc, char **argv)
 {
-	int sfd;
-	int result;
-	int len;
-	char ch[BUFSIZE];
+	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 + 1) == '-') {
-		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();
+		}
 	}
 
-	sfd = socket(AF_INET, SOCK_STREAM, 0);
+#ifdef GAPING_SECURITY_HOLE
+	if (pr00gie) {
+		/* won't need stdin */
+		close (fileno(stdin));                          
+	}
+#endif /* GAPING_SECURITY_HOLE */
 
-	hostinfo = (struct hostent *) gethostbyname(*argv);
 
-	if (!hostinfo) {
-		fatalError("cannot resolve %s\n", *argv);
-	}
+	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;
-	address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
-	address.sin_port = htons(atoi(*(++argv)));
 
-	len = sizeof(address);
+	if (lport != 0) {
+		memset(&address.sin_addr, 0, sizeof(address.sin_addr));
+		address.sin_port = htons(lport);
+
+		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");
 
-	result = connect(sfd, (struct sockaddr *) &address, len);
+		close(sfd);
+		sfd = tmpfd;
+	} else {
+		hostinfo = xgethostbyname(argv[optind]);
 
-	if (result < 0) {
-		perror("nc: connect");
-		exit(2);
+		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 */
+
 
 	FD_ZERO(&readfds);
 	FD_SET(sfd, &readfds);
-	FD_SET(fileno(stdin), &readfds);
+	FD_SET(STDIN_FILENO, &readfds);
 
 	while (1) {
 		int fd;
@@ -90,39 +148,29 @@ int nc_main(int argc, char **argv)
 
 		testfds = readfds;
 
-		result =
-			select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL,
-				   (struct timeval *) 0);
-
-		if (result < 1) {
-			perror("nc: select");
-			exit(3);
-		}
+		if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0)
+			perror_msg_and_die("select");
 
 		for (fd = 0; fd < FD_SETSIZE; fd++) {
 			if (FD_ISSET(fd, &testfds)) {
-				int trn = 0;
-				int rn;
-
-				ioctl(fd, FIONREAD, &nread);
+				if ((nread = safe_read(fd, buf, sizeof(buf))) < 0)
+					perror_msg_and_die("read");
 
 				if (fd == sfd) {
 					if (nread == 0)
 						exit(0);
-					ofd = fileno(stdout);
+					ofd = STDOUT_FILENO;
 				} else {
+					if (nread == 0)
+						shutdown(sfd, 1);
 					ofd = sfd;
 				}
 
-
-
-				do {
-					rn = (BUFSIZE < nread - trn) ? BUFSIZE : nread - trn;
-					trn += rn;
-					read(fd, ch, rn);
-					write(ofd, ch, rn);
+				if (full_write(ofd, buf, nread) < 0)
+					perror_msg_and_die("write");
+				if (delay > 0) {
+					sleep(delay);
 				}
-				while (trn < nread);
 			}
 		}
 	}