mirror of
https://github.com/sheumann/hush.git
synced 2024-11-18 17:10:36 +00:00
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/* mnc: mini-netcat - built from the ground up for LRP
|
|
Copyright (C) 1998 Charles P. Wright
|
|
|
|
0.0.1 6K It works.
|
|
0.0.2 5K Smaller and you can also check the exit condition if you wish.
|
|
0.0.3 Uses select()
|
|
|
|
19980918 Busy Boxed! Dave Cinege
|
|
19990512 Uses Select. Charles P. Wright
|
|
19990513 Fixes stdin stupidity and uses buffers. Charles P. Wright
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*/
|
|
#include "internal.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <sys/time.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#define BUFSIZE 100
|
|
|
|
const char mnc_usage[] =
|
|
"mini-netcat 0.0.3 -- Open pipe to IP:port\n"
|
|
"\tmnc [IP] [port]\n";
|
|
|
|
int
|
|
mnc_main(int argc, char **argv)
|
|
{
|
|
int sfd;
|
|
int result;
|
|
int len;
|
|
char ch[BUFSIZE];
|
|
|
|
struct sockaddr_in address;
|
|
struct hostent *hostinfo;
|
|
|
|
fd_set readfds, testfds;
|
|
|
|
sfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
|
|
hostinfo = (struct hostent *) gethostbyname(argv[1]);
|
|
|
|
if (!hostinfo)
|
|
{
|
|
exit(1);
|
|
}
|
|
|
|
address.sin_family = AF_INET;
|
|
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
|
|
address.sin_port = htons(atoi(argv[2]));
|
|
|
|
len = sizeof(address);
|
|
|
|
result = connect(sfd, (struct sockaddr *)&address, len);
|
|
|
|
if (result < 0)
|
|
{
|
|
exit(2);
|
|
}
|
|
|
|
FD_ZERO(&readfds);
|
|
FD_SET(sfd, &readfds);
|
|
FD_SET(fileno(stdin), &readfds);
|
|
|
|
while(1)
|
|
{
|
|
int fd;
|
|
int ofd;
|
|
int nread;
|
|
|
|
testfds = readfds;
|
|
|
|
result = select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL, (struct timeval *) 0);
|
|
|
|
if(result < 1)
|
|
{
|
|
exit(3);
|
|
}
|
|
|
|
for(fd = 0; fd < FD_SETSIZE; fd++)
|
|
{
|
|
if(FD_ISSET(fd,&testfds))
|
|
{
|
|
int trn = 0;
|
|
int rn;
|
|
|
|
ioctl(fd, FIONREAD, &nread);
|
|
|
|
if(fd == sfd)
|
|
{
|
|
if (nread == 0)
|
|
exit(0);
|
|
ofd = fileno(stdout);
|
|
}
|
|
else
|
|
{
|
|
ofd = sfd;
|
|
}
|
|
|
|
|
|
|
|
do
|
|
{
|
|
rn = (BUFSIZE < nread - trn) ? BUFSIZE : nread - trn;
|
|
trn += rn;
|
|
read(fd, ch, rn);
|
|
write(ofd, ch, rn);
|
|
}
|
|
while (trn < nread);
|
|
}
|
|
}
|
|
}
|
|
}
|