谁有Proxy相关的范例程序(200分)

我现在还不能确定是专门写一个proxy server给程序用，还是
让程序能够支持所有的proxy server，这两种方法我都没有写
过，请各位提供相关程序或者资料，谢谢！

同时的用到TCP/IP, HTTP, UDP三种协议，如果分数不够，我再加

一个c的程序，实现Server：
/*********************************************************************
program: proxyd
module: proxyd.c
summary: provides proxy tcp service for a host on an isolated network.
programmer: Carl Harris (ceharris@vt.edu)
date: 22 Feb 94

description:
This code implements a daemon process which listens for tcp connec-
tions on a specified port number. When a connection is established,
a child is forked to handle the new client. The child then
estab-
lishes a tcp connection to a port on the isolated host. The child
then
falls into a loop in which it writes data to the isolated host
for the client and vice-versa. Once a child has been forked, the
parent resumes listening for additional connections.
The name of the isolated host and the port to serve as proxy for,
as well as the port number the server listen on are specified as
command line arguments.
****************************************************************************/

#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netdb.h>

#define TCP_PROTO "tcp"
int proxy_port;
/* port to listen for proxy connections on */
struct sockaddr_in hostaddr;
/* host addr assembled from gethostbyname() */
extern int errno;
/* defined by libc.a */
extern char *sys_errlist[];
/* defined by libc.a */

void parse_args (int argc, char **argv);
void daemonize (int servfd);
voiddo
_proxy (int usersockfd);
void reap_status (void);
void errorout (char *msg);


/****************************************************************************
function: main
description: Main level driver. After daemonizing the process, a socket
is opened to listen for connections on the proxy port,
connections are accepted and children are spawned to handle
each new connection.
arguments:
argc,argv you know what those are.
return value: none.
calls: parse_args,do
_proxy.
globals: reads proxy_port.
****************************************************************************/
main (argc,argv)
int argc;
char **argv;
{
int clilen;
int childpid;
int sockfd, newsockfd;
struct sockaddr_in servaddr, cliaddr;
parse_args(argc,argv);
/* prepare an address struct to listen for connections */
bzero((char *) &amp;servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = proxy_port;
/* get a socket... */
if ((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0) {
fputs("failed to create server socket/r/n",stderr);
exit(1);
}
/* ...and bind our address and port to it */
if (bind(sockfd,(struct sockaddr_in *) &amp;servaddr,sizeof(servaddr)) < 0) {
fputs("faild to bind server socket to specified port/r/n",stderr);
exit(1);
}
/* get ready to accept with at most 5 clients waiting to connect */
listen(sockfd,5);

/* turn ourselves into a daemon */
daemonize(sockfd);
/* fall into a loop to accept new connections and spawn children */
while (1) {
/* accept the next connection */
clilen = sizeof(cliaddr);
newsockfd = accept(sockfd, (struct sockaddr_in *) &amp;cliaddr, &amp;clilen);
if (newsockfd < 0 &amp;&amp;
errno == EINTR)
continue;
/* a signal might interrupt our accept() call */
else
if (newsockfd < 0)
/* something quite amiss -- kill the server */
errorout("failed to accept connection");

/* fork a child to handle this connection */
if ((childpid = fork()) == 0) {
close(sockfd);
do
_proxy(newsockfd);
exit(0);
}
/* if fork() failed, the connection is silently dropped -- oops! */
close(newsockfd);
}
}

/****************************************************************************
function: parse_args
description: parse the command line args.
arguments:
argc,argv you know what these are.
return value: none.
calls: none.
globals: writes proxy_port, writes hostaddr.
****************************************************************************/
void parse_args (argc,argv)
int argc;
char **argv;
{
int i;
struct hostent *hostp;
struct servent *servp;
unsigned long inaddr;
struct {
char proxy_port [16];
char isolated_host [64];
char service_name [32];
} pargs;

if (argc < 4) {
printf("usage: %s <proxy-port> <host> <service-name|port-number>/r/n",
argv[0]);
exit(1);
}
strcpy(pargs.proxy_port,argv[1]);
strcpy(pargs.isolated_host,argv[2]);
strcpy(pargs.service_name,argv[3]);
for (i = 0;
i < strlen(pargs.proxy_port);
i++)
if (!isdigit(*(pargs.proxy_port + i)))
break;

if (i == strlen(pargs.proxy_port))
proxy_port = htons(atoi(pargs.proxy_port));
else
{
printf("%s: invalid proxy port/r/n",pargs.proxy_port);
exit(0);
}

bzero(&amp;hostaddr,sizeof(hostaddr));
hostaddr.sin_family = AF_INET;
if ((inaddr = inet_addr(pargs.isolated_host)) != INADDR_NONE)
bcopy(&amp;inaddr,&amp;hostaddr.sin_addr,sizeof(inaddr));
else
if ((hostp = gethostbyname(pargs.isolated_host)) != NULL)
bcopy(hostp->h_addr,&amp;hostaddr.sin_addr,hostp->h_length);
else
{
printf("%s: unknown host/r/n",pargs.isolated_host);
exit(1);
}

if ((servp = getservbyname(pargs.service_name,TCP_PROTO)) != NULL)
hostaddr.sin_port = servp->s_port;
else
if (atoi(pargs.service_name) > 0)
hostaddr.sin_port = htons(atoi(pargs.service_name));
else
{
printf("%s: invalid/unknown service name or port number/r/n",
pargs.service_name);
exit(1);
}
}

/****************************************************************************
function: daemonize
description: detach the server process from the current context,
creating a pristine, predictable environment in which it
will execute.
arguments:
servfd file descriptor in use by server.
return value: none.
calls: none.
globals: none.
****************************************************************************/
void daemonize (servfd)
int servfd;
{
int childpid, fd, fdtablesize;
/* ignore terminal I/O, stop signals */
signal(SIGTTOU,SIG_IGN);
signal(SIGTTIN,SIG_IGN);
signal(SIGTSTP,SIG_IGN);
/* fork to put us in the background (whether or not the user
specified '&amp;' on the command line */
if ((childpid = fork()) < 0) {
fputs("failed to fork first child/r/n",stderr);
exit(1);
}
else
if (childpid > 0)
exit(0);
/* terminate parent, continue in child */
/* dissociate from process group */
if (setpgrp(0,getpid()) < 0) {
fputs("failed to become process group leader/r/n",stderr);
exit(1);
}
/* lose controlling terminal */
if ((fd = open("/dev/tty",O_RDWR)) >= 0) {
ioctl(fd,TIOCNOTTY,NULL);

close(fd);
}
/* close any open file descriptors */
for (fd = 0, fdtablesize = getdtablesize();
fd < fdtablesize;
fd++)
if (fd != servfd)
close(fd);
/* set working directory to / to allow filesystems to be unmounted */
chdir("/");
/* clear the inherited umask */
umask(0);
/* setup zombie prevention */
signal(SIGCLD,reap_status);
}

/****************************************************************************
function: do
_proxy
description: do
es the actual work of virtually connecting a client to
the telnet service on the isolated host.
arguments:
usersockfd socket to which the client is connected.
return value: none.
calls: none.
globals: reads hostaddr.
****************************************************************************/
voiddo
_proxy (usersockfd)
int usersockfd;
{
int isosockfd;
fd_set rdfdset;
int connstat;
int iolen;
char buf [2048];

/* open a socket to connect to the isolated host */
if ((isosockfd = socket(AF_INET,SOCK_STREAM,0)) < 0)
errorout("failed to create socket to host");

/* attempt a connection */
connstat = connect(isosockfd,
(struct sockaddr *) &amp;hostaddr,
sizeof(hostaddr));
switch (connstat) {
case 0:
break;
case ETIMEDOUT:
case ECONNREFUSED:
case ENETUNREACH:
strcpy(buf,sys_errlist[errno]);
strcat(buf,"/r/n");
write(usersockfd,buf,strlen(buf));
close(usersockfd);
exit(1);
/* die peacefully if we can't establish a connection */
break;
default:
errorout("failed to connect to host");
}

/* now we're connected, serve fall into the data echo loop */
while (1) {
/* Select for readability on either of our two sockets */
FD_ZERO(&amp;rdfdset);
FD_SET(usersockfd,&amp;rdfdset);
FD_SET(isosockfd,&amp;rdfdset);
if (select(FD_SETSIZE,&amp;rdfdset,NULL,NULL,NULL) < 0)
errorout("select failed");

/* is the client sending data? */
if (FD_ISSET(usersockfd,&amp;rdfdset)) {
if ((iolen = read(usersockfd,buf,sizeof(buf))) <= 0)
break;
/* zero length means the client disconnected */

write(isosockfd,buf,iolen);
/* copy to host -- blocking semantics */
}
/* is the host sending data? */
if (FD_ISSET(isosockfd,&amp;rdfdset)) {
if ((iolen = read(isosockfd,buf,sizeof(buf))) <= 0)
break;
/* zero length means the host disconnected */

write(usersockfd,buf,iolen);
/* copy to client -- blocking semantics */
}
}
/* we'redo
ne with the sockets */
close(isosockfd);
close(usersockfd);
}

/****************************************************************************
function: errorout
description: displays an error message on the console and kills the
current process.
arguments:
msg message to be displayed.
return value: none --do
es not return.
calls: none.
globals: none.
****************************************************************************/
void errorout (msg)
char *msg;
{
FILE *console;
console = fopen("/dev/console","a");
fprintf(console,"proxyd: %s/r/n",msg);
fclose(console);
exit(1);
}


/****************************************************************************
function: reap_status
description: handle a SIGCLD signal by reaping the exit status of the
perished child, and discarding it.
arguments: none.
return value: none.
calls: none.
globals: none.
****************************************************************************/
void reap_status ()
{
int pid;
union wait status;
while ((pid = wait3(&amp;status,WNOHANG,NULL)) > 0)
;
/* loop while there are more dead children */
}

DNCHen,我写过支持Sock5协议的VCL,基于 Socks5基本可让任何协议支持Proxy

谢谢JJLEI，我几乎就是C盲，所以...
TQZ，什么时候把原程序给我看看？

tqz可以把原程序给我看一下么！

tqz，没有收到你的原程序，我想学学，我已经从那个公司辞职了，因为要做毕业设计。谢谢，谢谢 8#-)

tqz能给我发一份源程序吗？谢谢

我也想要一份“支持Sock5协议的VCL“的源程序。请发到 wuyicai@263.net

多人接受答案了。