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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="192.htm">上一层</a>][<a href="265.htm">下一篇</a>]
<hr><p align="left"><small>发信人: raner (毕设好无聊呀!), 信区: Linux <br>
标 题: Re: 谁把lenx的datapipe的程序再贴一次? <br>
发信站: BBS 水木清华站 (Wed May 6 21:14:33 1998) <br>
<br>
【 在 scaner (S.c.a.n.e.R) 的大作中提到: 】 <br>
∶ 如题,想用的时候总是没有,呵呵. <br>
<br>
/* <br>
一个非常短小实用的程序, 可以非常简单的实现类似proxy的中转功能 <br>
<br>
比如, 我在mirg运行 <br>
datapipe 2222 21 159.226.23.7 <br>
<br>
以后, ftp mirg:2222就会通过mirg连接到23.7, 非常的方便 <br>
<br>
可以用datapipe层层接力, 或者用于实现简单的NAT功能, 十分好玩 :-) <br>
<br>
The following is an interesting snippet of code I wrote recently. It <br>
makes a data pipe between a listen port on the machine it's being run on <br>
and a port on a remote machine. For example, running <br>
datapipe 2222 23 your.machine.com <br>
<br>
would create a port 2222 on the local machine that, if telnetted to, would <br>
be the same as telnetting to port 23 on your.machine.com. This can be used <br>
for a variety of purposes: redirect IRC connections so that identd shows <br>
the username of the datapipe process; redirect sendmail direct connections <br>
for the same reason; even use on a firewall machine to give access to an <br>
internal service (ftpd, for instance). Cascaded datapipes make for <br>
interesting traceback dilemmas. Questions and comments accepted. <br>
<br>
Compile with: <br>
cc -o datapipe -O datapipe.c <br>
On boxes without strerror() (like SunOS 4.x), compile with: <br>
cc -o datapipe -O -DSTRERROR datapipe.c <br>
<br>
Run as: <br>
datapipe localport remoteport remotehost <br>
<br>
It will fork itself into the background. <br>
<br>
/* <br>
* Datapipe - Create a listen socket to pipe connections to another <br>
* machine/port. 'localport' accepts connections on the machine running <br>
* datapipe, which will connect to 'remoteport' on 'remotehost'. Fairly <br>
* standard 500 xxxx extended errors are used if something drastic <br>
* happens. <br>
for a variety of purposes: redirect IRC connections so that identd shows <br>
the username of the datapipe process; redirect sendmail direct connections <br>
for the same reason; even use on a firewall machine to give access to an <br>
internal service (ftpd, for instance). Cascaded datapipes make for <br>
interesting traceback dilemmas. Questions and comments accepted. <br>
<br>
Compile with: <br>
cc -o datapipe -O datapipe.c <br>
On boxes without strerror() (like SunOS 4.x), compile with: <br>
cc -o datapipe -O -DSTRERROR datapipe.c <br>
<br>
Run as: <br>
datapipe localport remoteport remotehost <br>
<br>
It will fork itself into the background. <br>
<br>
/* <br>
* Datapipe - Create a listen socket to pipe connections to another <br>
* machine/port. 'localport' accepts connections on the machine running <br>
* datapipe, which will connect to 'remoteport' on 'remotehost'. Fairly <br>
* standard 500 xxxx extended errors are used if something drastic <br>
* happens. <br>
* <br>
* (c) 1995 Todd Vierling <br>
* <br>
* Define STRERROR while compiling on a SunOS 4.x box <br>
*/ <br>
<br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <sys/wait.h> <br>
#include <netinet/in.h> <br>
#include <stdio.h> <br>
#include <stdlib.h> <br>
#include <errno.h> <br>
#include <unistd.h> <br>
#include <netdb.h> <br>
<br>
#//include <linux/time.h> <br>
<br>
#ifdef STRERROR <br>
extern char *sys_errlist[]; <br>
extern int sys_nerr; <br>
char *undef = "Undefined error"; <br>
<br>
char *strerror(error) <br>
int error; <br>
{ <br>
if (error > sys_nerr) <br>
return undef; <br>
return sys_errlist[error]; <br>
} <br>
#endif <br>
<br>
main(argc, argv) <br>
int argc; <br>
char **argv; <br>
{ <br>
int lsock, csock, osock; <br>
FILE *cfile; <br>
char buf[4096]; <br>
struct sockaddr_in laddr, caddr, oaddr; <br>
int caddrlen = sizeof(caddr); <br>
fd_set fdsr, fdse; <br>
struct hostent *h; <br>
struct servent *s; <br>
int nbyt; <br>
unsigned long a; <br>
unsigned short oport; <br>
<br>
if (argc != 4) { <br>
fprintf(stderr,"Usage: %s localport remoteport remotehost\n",argv[0]); <br>
return 30; <br>
} <br>
a = inet_addr(argv[3]); <br>
if (!(h = gethostbyname(argv[3])) && <br>
!(h = gethostbyaddr(&a, 4, AF_INET))) { <br>
perror(argv[3]); <br>
return 25; <br>
} <br>
oport = atol(argv[2]); <br>
laddr.sin_port = htons((unsigned short)(atol(argv[1]))); <br>
if ((lsock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { <br>
perror("socket"); <br>
return 20; <br>
} <br>
laddr.sin_family = htons(AF_INET); <br>
laddr.sin_addr.s_addr = htonl(0); <br>
if (bind(lsock, &laddr, sizeof(laddr))) { <br>
perror("bind"); <br>
return 20; <br>
} <br>
if (listen(lsock, 1)) { <br>
perror("listen"); <br>
return 20; <br>
} <br>
if ((nbyt = fork()) == -1) { <br>
perror("fork"); <br>
return 20; <br>
} <br>
if (nbyt > 0) <br>
return 0; <br>
setsid(); <br>
while ((csock = accept(lsock, &caddr, &caddrlen)) != -1) { <br>
cfile = fdopen(csock,"r+"); <br>
if ((nbyt = fork()) == -1) { <br>
fprintf(cfile, "500 fork: %s\n", strerror(errno)); <br>
shutdown(csock,2); <br>
fclose(cfile); <br>
continue; <br>
} <br>
if (nbyt == 0) <br>
goto gotsock; <br>
fclose(cfile); <br>
while (waitpid(-1, NULL, WNOHANG) > 0); <br>
} <br>
return 20; <br>
<br>
gotsock: <br>
if ((osock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { <br>
fprintf(cfile, "500 socket: %s\n", strerror(errno)); <br>
goto quit1; <br>
} <br>
oaddr.sin_family = h->h_addrtype; <br>
oaddr.sin_port = htons(oport); <br>
memcpy(&oaddr.sin_addr, h->h_addr, h->h_length); <br>
if (connect(osock, &oaddr, sizeof(oaddr))) { <br>
fprintf(cfile, "500 connect: %s\n", strerror(errno)); <br>
goto quit1; <br>
} <br>
while (1) { <br>
while (1) { <br>
FD_ZERO(&fdsr); <br>
FD_ZERO(&fdse); <br>
FD_SET(csock,&fdsr); <br>
FD_SET(csock,&fdse); <br>
FD_SET(osock,&fdsr); <br>
FD_SET(osock,&fdse); <br>
if (select(20, &fdsr, NULL, &fdse, NULL) == -1) { <br>
fprintf(cfile, "500 select: %s\n", strerror(errno)); <br>
goto quit2; <br>
} <br>
if (FD_ISSET(csock,&fdsr) || FD_ISSET(csock,&fdse)) { <br>
if ((nbyt = read(csock,buf,4096)) <= 0) <br>
goto quit2; <br>
if ((write(osock,buf,nbyt)) <= 0) <br>
goto quit2; <br>
} else if (FD_ISSET(osock,&fdsr) || FD_ISSET(osock,&fdse)) { <br>
if ((nbyt = read(osock,buf,4096)) <= 0) <br>
goto quit2; <br>
if ((write(csock,buf,nbyt)) <= 0) <br>
goto quit2; <br>
} <br>
} <br>
<br>
quit2: <br>
shutdown(osock,2); <br>
close(osock); <br>
quit1: <br>
fflush(cfile); <br>
shutdown(csock,2); <br>
quit0: <br>
fclose(cfile); <br>
return 0; <br>
} <br>
<br>
-- <br>
</small><hr>
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