This depmod script will create a modules.dep file, just like the depmod

[oweals/busybox.git] / nc.c

diff --git a/nc.c b/nc.c
index a588587fbc37331af01928ad01aa302d4e30a011..5335872e5a7ca50b4e3fa5b410fbffb333d459b9 100644 (file)
--- a/nc.c
+++ b/nc.c
@@ -25,9 +25,10 @@
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 */
-#include "internal.h"
+
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include <sys/types.h>
@@ -37,56 +38,71 @@
 #include <netdb.h>
 #include <sys/time.h>
 #include <sys/ioctl.h>
-
-#define BUFSIZE 100
-
-static const char nc_usage[] = "nc [IP] [port]\n" 
-#ifndef BB_FEATURE_TRIVIAL_HELP
-       "\nNetcat opens a pipe to IP:port\n"
-#endif
-       ;
+#include "busybox.h"
 
 int nc_main(int argc, char **argv)
 {
-       int sfd;
-       int result;
-       int len;
-       char ch[BUFSIZE];
+       int do_listen = 0, lport = 0, tmpfd, opt, sfd;
+       char buf[BUFSIZ];
 
        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:")) > 0) {
+               switch (opt) {
+                       case 'l':
+                               do_listen++;
+                               break;
+                       case 'p':
+                               lport = atoi(optarg);
+                               break;
+                       default:
+                               show_usage();
+               }
        }
 
-       sfd = socket(AF_INET, SOCK_STREAM, 0);
+       if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
+               show_usage();
 
-       hostinfo = (struct hostent *) gethostbyname(*argv);
+       if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+               perror_msg_and_die("socket");
 
-       if (!hostinfo) {
-               exit(1);
+       address.sin_family = AF_INET;
+
+       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");
        }
 
-       address.sin_family = AF_INET;
-       address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
-       address.sin_port = htons(atoi(*(++argv)));
+       if (do_listen) {
+               socklen_t addrlen = sizeof(address);
+
+               if (listen(sfd, 1) < 0)
+                       perror_msg_and_die("listen");
 
-       len = sizeof(address);
+               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) {
-               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");
        }
 
        FD_ZERO(&readfds);
        FD_SET(sfd, &readfds);
-       FD_SET(fileno(stdin), &readfds);
+       FD_SET(STDIN_FILENO, &readfds);
 
        while (1) {
                int fd;
@@ -95,38 +111,26 @@ 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) {
-                       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);
-                               }
-                               while (trn < nread);
+                               if (full_write(ofd, buf, nread) < 0)
+                                       perror_msg_and_die("write");
                        }
                }
        }