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Add netcat -i option, per patch from Cristian Ionescu-Idbohrn

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<cristian.ionescu-idbohrn@axis.com>
This commit is contained in:
Eric Andersen 2002-04-26 23:59:12 +00:00
parent 00a6a75035
commit 1323c940fd
2 changed files with 41 additions and 2 deletions
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1
include/usage.h
View File

@ -1267,6 +1267,7 @@
"Options:\n" \ "Options:\n" \
"\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-e PROG\t\tprogram to exec after connect (dangerous!)" "\t-e PROG\t\tprogram to exec after connect (dangerous!)"
#define nc_example_usage \ #define nc_example_usage \
"$ nc foobar.somedomain.com 25\n" \ "$ nc foobar.somedomain.com 25\n" \

42
networking/nc.c
View File

@ -40,17 +40,22 @@
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include "busybox.h" #include "busybox.h"
#define GAPING_SECURITY_HOLE
int nc_main(int argc, char **argv) int nc_main(int argc, char **argv)
{ {
int do_listen = 0, lport = 0, tmpfd, opt, sfd; int do_listen = 0, lport = 0, delay = 0, tmpfd, opt, sfd;
char buf[BUFSIZ]; char buf[BUFSIZ];
#ifdef GAPING_SECURITY_HOLE
char * pr00gie = NULL;
#endif
struct sockaddr_in address; struct sockaddr_in address;
struct hostent *hostinfo; struct hostent *hostinfo;
fd_set readfds, testfds; fd_set readfds, testfds;
while ((opt = getopt(argc, argv, "lp:")) > 0) { while ((opt = getopt(argc, argv, "lp:i:e:")) > 0) {
switch (opt) { switch (opt) {
case 'l': case 'l':
do_listen++; do_listen++;
@ -58,11 +63,27 @@ int nc_main(int argc, char **argv)
case 'p': case 'p':
lport = atoi(optarg); lport = atoi(optarg);
break; break;
case 'i':
delay = atoi(optarg);
break;
#ifdef GAPING_SECURITY_HOLE
case 'e':
pr00gie = optarg;
break;
#endif
default: default:
show_usage(); 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)) if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
show_usage(); show_usage();
@ -100,6 +121,20 @@ int nc_main(int argc, char **argv)
perror_msg_and_die("connect"); 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_ZERO(&readfds);
FD_SET(sfd, &readfds); FD_SET(sfd, &readfds);
FD_SET(STDIN_FILENO, &readfds); FD_SET(STDIN_FILENO, &readfds);
@ -131,6 +166,9 @@ int nc_main(int argc, char **argv)
if (full_write(ofd, buf, nread) < 0) if (full_write(ofd, buf, nread) < 0)
perror_msg_and_die("write"); perror_msg_and_die("write");
if (delay > 0) {
sleep(delay);
}
} }
} }
} }