[收藏]穿透代理服务器编程

天云上人

  作者 allfresh
5 Z& p) s( b0 m2 D4 L6 K1 P: p& P# c文章原始出处 www.allfresh.net/program/proxy.htm
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正文
在网络程序设计过程中，我们经常要与各种类型的代理服务器打交道，比如在企业内部网通过代理去访问Internet网上的服务器等等，一般代理服务器支持几种常见的代理协议标准，如Socks4,Socks5,Http代理，其中Socks5需要用户验证，代理相对复杂。我在查阅RFC文档和相关资料后，特总结一些TCP协议穿透代理服务器的程序片断，希望对大家有所帮助。
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//使用到的结构
# i9 u; t, u4 ^* t, G: P6 dstruct sock4req1
9 z) q7 G  n! K7 K, F* _{
char VN;
char CD;
# F1 o2 G' L; r. M9 Qunsigned short Port;
unsigned long IPAddr;
char other[1];
};
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- Z( n: d- T1 C8 Z6 ^9 q3 M6 kstruct sock4ans1
{
char VN;
) T& D5 t; a; i% O$ R- q; m, achar CD;
};
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struct sock5req1
+ ^4 f" A8 H; @! Q{
% ]7 f0 U/ }' Pchar Ver;
% S% r8 `; }8 w- B" A& tchar nMethods;
0 H+ k. e, b, ^3 o# Q5 _char Methods[255];
$ n7 p  L3 V, \: {$ L' R: E& u$ T};
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" b* ~% `( d9 ^& b& Z8 h+ s8 c& Ystruct sock5ans1
) {* F' [' Y; u- W9 R7 `{
5 M: X( J- P! L! ichar Ver;
char Method;
};
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struct sock5req2
{
char Ver;
char Cmd;
+ z! b8 I# [$ a3 d( G- gchar Rsv;
5 G6 ]9 I4 K+ A2 S  v* e& m* G: Echar Atyp;
char other[1];
};
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struct sock5ans2
{
char Ver;
  v9 D- K3 E$ l9 v/ B* W2 h& nchar Rep;
char Rsv;
char Atyp;
char other[1];
) Y9 }* C# K0 M: F8 V4 X};
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struct authreq
4 H6 c) I' @6 y9 P9 Z' x) O{
char Ver;
char Ulen;
char Name[255];
3 V, A2 z, y" d" ~& rchar PLen;
' O" m% b9 k% [2 rchar Pass[255];
};
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struct authans
: c! w- }; E& M+ e7 P) j" ^1 l7 G) K{
char Ver;
char Status;
2 n# t, ^& {. Z) h& G9 i, ^};
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2 _9 I& T8 z! `' D5 c! ^//通过Socks4方式代理
if( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
{
; g7 C" p  g+ ], u- B' hm_sError = _T("不能连接到代理服务器!");
ClientSock.Close();
return FALSE;
}
) f5 |$ V# J: o' i0 C. \; c) mchar buff[100];
memset(buff,0,100);
struct sock4req1 *m_proxyreq;
m_proxyreq = (struct sock4req1 *)buff;
m_proxyreq->VN = 4;
m_proxyreq->CD = 1;
! C# F( _& \$ T  j0 d  Km_proxyreq-&gtort = ntohs(GetPort());
m_proxyreq->IPAddr = inet_addr(GetServerHostName());
ClientSock.Send(buff,9);
struct sock4ans1 *m_proxyans;
2 z1 K* Y$ G$ G: e9 [& P# x5 vm_proxyans = (struct sock4ans1 *)buff;
memset(buff,0,100);
$ V; l% C/ a" W! p/ |; SClientSock.Receive(buff,100);
if(m_proxyans->VN != 0 || m_proxyans->CD != 90)
! A2 }  k& k3 s" T% M8 H+ G{
m_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
" u- o9 Q- X& H5 Kreturn FALSE;
}
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+ z0 e3 R; F% x9 H. n6 y
9 v7 R! E3 G5 U; C8 p8 ~' k! J9 g0 P//通过Socks5方式代理
9 T3 h8 C1 M/ A  Aif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
+ h# N2 a; T* L{
2 S5 G  x; E+ P- o. x" Hm_sError = _T("不能连接到代理服务器!");
$ h1 T4 b) s/ l4 ^* {" kClientSock.Close();
return FALSE;
}
, ]- M! `0 t) _: ?! P9 Pchar buff[600];
" O/ j% V+ x; l* Y! ]- tstruct sock5req1 *m_proxyreq1;
1 d3 g# O% R$ n+ U# y; s- i4 om_proxyreq1 = (struct sock5req1 *)buff;
4 r* M6 n9 F! ~5 Y0 C  V) bm_proxyreq1->Ver = 5;
8 e7 X3 ]+ I! h. j9 hm_proxyreq1->nMethods = 2;
m_proxyreq1->Methods[0] = 0;
m_proxyreq1->Methods[1] = 2;
ClientSock.Send(buff,4);
- e( u: F+ h7 d2 g' dstruct sock5ans1 *m_proxyans1;
m_proxyans1 = (struct sock5ans1 *)buff;
memset(buff,0,600);
ClientSock.Receive(buff,600);
if(m_proxyans1->Ver != 5 || (m_proxyans1->Method!=0 && m_proxyans1->Method!=2))
$ O" ?  r+ W# m! d: S{
m_sError = _T("通过代理连接主站不成功!");
1 \) n- \, |0 x6 X" v5 bClientSock.Close();
return FALSE;
}
if(m_proxyans1->Method == 2)
, u$ q- ^& ?- L$ V1 H0 e7 c7 |{
int nUserLen = strlen(g_ProxyInfo.m_strProxyUser);
int nPassLen = strlen(g_ProxyInfo.m_strProxyPass);
struct authreq *m_authreq;
m_authreq = (struct authreq *)buff;
m_authreq->Ver = 1;
m_authreq->Ulen = nUserLen;
5 y# o' X" U2 r& Xstrcpy(m_authreq->Name,g_ProxyInfo.m_strProxyUser);
m_authreq-&gtLen = nPassLen;
strcpy(m_authreq-&gtass,g_ProxyInfo.m_strProxyPass);
ClientSock.Send(buff,513);
struct authans *m_authans;
& u0 E2 S$ z' q2 K3 I" Am_authans = (struct authans *)buff;
memset(buff,0,600);
ClientSock.Receive(buff,600);
1 @# }" s- D: O. I- J3 \  Q# sif(m_authans->Ver != 1 || m_authans->Status != 0)
{
$ ]- ^% \$ n( K3 s7 Km_sError = _T("代理服务器用户验证不成功!");
; u6 B5 e- D* R$ s% @! t2 CClientSock.Close();
return FALSE;
}
: ~4 y; g: E" B$ k# }2 P* Z: ]}
5 o+ l7 x. C- f3 M4 Astruct sock5req2 *m_proxyreq2;
m_proxyreq2 = (struct sock5req2 *)buff;
m_proxyreq2->Ver = 5;
4 i' h- [* D' om_proxyreq2->Cmd = 1;
1 A8 e8 p" H" V6 xm_proxyreq2->Rsv = 0;
  ?. l# r2 J. X$ g1 km_proxyreq2->Atyp = 1;
0 k0 j' s% p8 O* s* ^' V4 X* Uunsigned long tmpLong = inet_addr(GetServerHostName());
unsigned short port = ntohs(GetPort());
* }! P$ l$ U) g0 V  Omemcpy(m_proxyreq2->other,&tmpLong,4);
memcpy(m_proxyreq2->other+4,&port,2);
1 Q) Z- }0 d1 yClientSock.Send(buff,sizeof(struct sock5req2)+5);
struct sock5ans2 *m_proxyans2;
  V' T3 s+ Z- ~& s% \! pmemset(buff,0,600);
' o# b( z9 y3 Lm_proxyans2 = (struct sock5ans2 *)buff;
ClientSock.Receive(buff,600);
if(m_proxyans2->Ver != 5 || m_proxyans2->Rep != 0)
" E* G& t% {" U% `* w+ K{
m_sError = _T("通过代理连接主站不成功!");
+ W$ g! o" o7 Q! d: X! aClientSock.Close();
return FALSE;
}
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$ T+ q6 l4 C! n6 z7 b; b- H" B) [//通过HTTP方式代理
if( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
{
m_sError = _T("不能连接到代理服务器!");
ClientSock.Close();
return FALSE;
}
char buff[600];
: G8 |, \: n; `' m/ `! c5 ^0 z5 Osprintf( buff, "%s%s:%d%s","CONNECT ",GetServerHostName(),GetPort()," HTTP/1.1\r\nUser-Agent: MyApp/0.1\r\n\r\n");
& m+ B% r; m3 x+ j$ ?ClientSock.Send(buff,strlen(buff)); //发送请求
' [" S) l# W8 f+ W3 O/ Umemset(buff,0,600);
ClientSock.Receive(buff,600);
7 K/ i. d  l8 i6 Y7 n! W% Y1 Fif(strstr(buff, "HTTP/1.0 200 Connection established") == NULL) //连接不成功
{
% k! Y! d9 v4 [  U1 K# Vm_sError = _T("通过代理连接主站不成功!");
( F- ~3 N% H; o; f- h. I0 |ClientSock.Close();
+ x* K+ r6 {3 V3 a  M- J3 \! kreturn FALSE;
}
: P9 @, y; A4 I2 Z% k# |1 S" T我们一般先与代理服务器连通，然后向代理服务器发送代理验证的用户名和密码(如果需要,如Socks5代理)，验证成功后，再向代理服务器发送需要连接的目的地址和端口。以上代码仅用于TCP连接，如果在内部网侦听或通过UDP协议发送信息，可查阅RFC1829等文档资料。