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Add listening support.

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This commit is contained in:
Matt Kraai 2001-02-07 04:09:23 +00:00
parent df8ccb6350
commit 1d70267450
5 changed files with 102 additions and 29 deletions
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8
applets/usage.c
View File

@ -959,9 +959,13 @@ const char mv_usage[] =
#if defined BB_NC #if defined BB_NC
const char nc_usage[] = const char nc_usage[] =
"nc [IP] [port]" "nc [-p PORT] IP PORT\n"
" or: nc -l -p PORT"
#ifndef BB_FEATURE_TRIVIAL_HELP #ifndef BB_FEATURE_TRIVIAL_HELP
"\n\nNetcat opens a pipe to IP:port" "\n\nNetcat opens a pipe to IP:PORT\n"
"Options:\n"
"\t-l\tListen on the socket.\n"
"\t-p PORT\tBind the local port to PORT."
#endif #endif
; ;
#endif #endif

7
docs/busybox.sgml
View File

@ -2452,7 +2452,12 @@
</para> </para>
<para> <para>
Open a pipe to HOST:PORT. or: nc -p PORT -l
</para>
<para>
Open a pipe to HOST:PORT or listen for a connection on PORT.
</para> </para>
<para> <para>

54
nc.c
View File

@ -41,7 +41,7 @@
int nc_main(int argc, char **argv) int nc_main(int argc, char **argv)
{ {
int sfd; int do_listen = 0, lport = 0, tmpfd, opt, sfd;
char buf[BUFSIZ]; char buf[BUFSIZ];
struct sockaddr_in address; struct sockaddr_in address;
@ -49,24 +49,54 @@ int nc_main(int argc, char **argv)
fd_set readfds, testfds; fd_set readfds, testfds;
argc--; while ((opt = getopt(argc, argv, "lp:")) > 0) {
argv++; switch (opt) {
if (argc < 2 || **argv == '-') { case 'l':
usage(nc_usage); do_listen++;
break;
case 'p':
lport = atoi(optarg);
break;
default:
usage(nc_usage);
}
} }
if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
usage(nc_usage);
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror_msg_and_die("socket"); perror_msg_and_die("socket");
if ((hostinfo = gethostbyname(*argv)) == NULL)
error_msg_and_die("cannot resolve %s", *argv);
address.sin_family = AF_INET; address.sin_family = AF_INET;
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
address.sin_port = htons(atoi(*(++argv)));
if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0) if (lport != 0) {
perror_msg_and_die("connect"); 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) {
if (listen(sfd, 1) < 0)
perror_msg_and_die("listen");
if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
perror_msg_and_die("accept");
close(sfd);
sfd = tmpfd;
} else {
if ((hostinfo = gethostbyname(argv[optind])) == NULL)
error_msg_and_die("cannot resolve %s\n", 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");
}
FD_ZERO(&readfds); FD_ZERO(&readfds);
FD_SET(sfd, &readfds); FD_SET(sfd, &readfds);

54
networking/nc.c
View File

@ -41,7 +41,7 @@
int nc_main(int argc, char **argv) int nc_main(int argc, char **argv)
{ {
int sfd; int do_listen = 0, lport = 0, tmpfd, opt, sfd;
char buf[BUFSIZ]; char buf[BUFSIZ];
struct sockaddr_in address; struct sockaddr_in address;
@ -49,24 +49,54 @@ int nc_main(int argc, char **argv)
fd_set readfds, testfds; fd_set readfds, testfds;
argc--; while ((opt = getopt(argc, argv, "lp:")) > 0) {
argv++; switch (opt) {
if (argc < 2 || **argv == '-') { case 'l':
usage(nc_usage); do_listen++;
break;
case 'p':
lport = atoi(optarg);
break;
default:
usage(nc_usage);
}
} }
if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
usage(nc_usage);
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror_msg_and_die("socket"); perror_msg_and_die("socket");
if ((hostinfo = gethostbyname(*argv)) == NULL)
error_msg_and_die("cannot resolve %s", *argv);
address.sin_family = AF_INET; address.sin_family = AF_INET;
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
address.sin_port = htons(atoi(*(++argv)));
if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0) if (lport != 0) {
perror_msg_and_die("connect"); 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) {
if (listen(sfd, 1) < 0)
perror_msg_and_die("listen");
if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
perror_msg_and_die("accept");
close(sfd);
sfd = tmpfd;
} else {
if ((hostinfo = gethostbyname(argv[optind])) == NULL)
error_msg_and_die("cannot resolve %s\n", 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");
}
FD_ZERO(&readfds); FD_ZERO(&readfds);
FD_SET(sfd, &readfds); FD_SET(sfd, &readfds);

8
usage.c
View File

@ -959,9 +959,13 @@ const char mv_usage[] =
#if defined BB_NC #if defined BB_NC
const char nc_usage[] = const char nc_usage[] =
"nc [IP] [port]" "nc [-p PORT] IP PORT\n"
" or: nc -l -p PORT"
#ifndef BB_FEATURE_TRIVIAL_HELP #ifndef BB_FEATURE_TRIVIAL_HELP
"\n\nNetcat opens a pipe to IP:port" "\n\nNetcat opens a pipe to IP:PORT\n"
"Options:\n"
"\t-l\tListen on the socket.\n"
"\t-p PORT\tBind the local port to PORT."
#endif #endif
; ;
#endif #endif