[收藏]穿透代理服务器编程

天云上人

  作者 allfresh
6 @3 x8 b% [6 A" C1 T5 }9 T文章原始出处 www.allfresh.net/program/proxy.htm
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' x4 o  h5 q1 a7 M1 w) G$ ?1 w" f正文
( ~9 X. P8 K* D) ]% ?8 w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
9 L3 u8 c: H2 J0 f* \struct sock4req1
1 }+ A9 l( E/ Q. S{
char VN;
* z3 {0 A$ M: dchar CD;
* |* k# k' |8 N. C5 P$ Kunsigned short Port;
8 ?$ ]. A, ^  e, X) p9 B1 Eunsigned long IPAddr;
char other[1];
2 l$ A8 h* {6 }% w$ m4 p& p2 L8 Y1 `1 |};
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struct sock4ans1
# J& e3 B. [( H# \6 I4 n{
char VN;
char CD;
};
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struct sock5req1
2 m& H$ \2 l: ^- C+ a{
char Ver;
char nMethods;
" a' ?2 Y( W7 K  P* Ychar Methods[255];
};
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  @5 r3 w, j& v/ ^2 c4 ]; Sstruct sock5ans1
; R0 z6 y! h) j* M* t{
char Ver;
8 V6 K1 T& C6 C: I9 Mchar Method;
};
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struct sock5req2
& H$ g$ n3 b( a  v{
char Ver;
7 b7 C4 {0 Q  a3 A  @. tchar Cmd;
char Rsv;
6 d# V# }- S# [char Atyp;
char other[1];
: O. h8 ]" u6 R# b};
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struct sock5ans2
{
1 Z! C2 R" c! Y5 i8 n5 Schar Ver;
: i" n* a2 C" S& ^! Pchar Rep;
0 x4 i! [% ?  _& X; ychar Rsv;
$ A2 s$ y/ @6 |% C+ ichar Atyp;
char other[1];
};
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struct authreq
+ i: B( `; o/ x* Q% b3 L$ b{
- x: Q  j1 D* I0 `char Ver;
char Ulen;
$ }; q6 w$ p4 }" Kchar Name[255];
, Q  a( B7 l$ i- Xchar PLen;
char Pass[255];
};
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( |( p( ~% E& J  N' ?, Cstruct authans
{
/ G* L  [' L! Schar Ver;
" C# R0 i4 T6 |7 `. M$ _, Z: n- }' F5 _char Status;
( {: z* D$ R# ~8 H+ S; U3 f5 \/ ?};
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//通过Socks4方式代理
0 v9 w! X7 q; k; V7 ~  Jif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
{
m_sError = _T("不能连接到代理服务器!");
# k, `9 B2 t& d( c- I# JClientSock.Close();
return FALSE;
}
4 v) j5 C7 w4 O* ]% y! }char buff[100];
# a% b6 P% h* V! a  C0 H$ r% |memset(buff,0,100);
5 @7 ^( s, O7 Rstruct sock4req1 *m_proxyreq;
' h7 h  y7 Y; Lm_proxyreq = (struct sock4req1 *)buff;
& q, b% O! C9 xm_proxyreq->VN = 4;
m_proxyreq->CD = 1;
m_proxyreq-&gtort = ntohs(GetPort());
& U% |$ O" L. hm_proxyreq->IPAddr = inet_addr(GetServerHostName());
, r3 I; R1 P$ _4 Q! ~ClientSock.Send(buff,9);
struct sock4ans1 *m_proxyans;
m_proxyans = (struct sock4ans1 *)buff;
9 C0 C1 V* [( |( s8 N4 z9 p; dmemset(buff,0,100);
ClientSock.Receive(buff,100);
if(m_proxyans->VN != 0 || m_proxyans->CD != 90)
{
m_sError = _T("通过代理连接主站不成功!");
/ i2 c3 E1 X" Q  ]6 H3 f. v" VClientSock.Close();
# E1 _/ w9 B9 b: areturn FALSE;
& l& L0 \+ H, s9 q5 g}
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6 r9 }- f( j0 z//通过Socks5方式代理
9 D, t$ T9 p7 z5 i' eif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
8 l- |- J5 |! M' \, r# `0 q" }{
8 A7 B, q3 c: w7 P7 W) q. d: }m_sError = _T("不能连接到代理服务器!");
2 @2 d3 Q; |' AClientSock.Close();
% T$ o9 F3 P/ i" Creturn FALSE;
8 Q. t$ ?; S) Z, q& ]) O( W}
char buff[600];
2 B: M# p7 R) kstruct sock5req1 *m_proxyreq1;
5 M/ G6 v4 {2 W: _: Vm_proxyreq1 = (struct sock5req1 *)buff;
m_proxyreq1->Ver = 5;
m_proxyreq1->nMethods = 2;
9 p, ~1 L+ ?- M0 o9 _4 T5 Mm_proxyreq1->Methods[0] = 0;
3 w/ E, i2 l. u8 f$ Am_proxyreq1->Methods[1] = 2;
$ j( G2 \  V, v7 b# YClientSock.Send(buff,4);
4 P% n5 I% S9 h! {9 Xstruct sock5ans1 *m_proxyans1;
m_proxyans1 = (struct sock5ans1 *)buff;
1 s6 S" q; {+ {5 V* b$ K3 Mmemset(buff,0,600);
ClientSock.Receive(buff,600);
if(m_proxyans1->Ver != 5 || (m_proxyans1->Method!=0 && m_proxyans1->Method!=2))
{
4 t  Q3 r! v7 W' x& g$ k1 ]$ [# @m_sError = _T("通过代理连接主站不成功!");
; u  [6 F( [. o$ w$ f1 jClientSock.Close();
return FALSE;
}
if(m_proxyans1->Method == 2)
{
int nUserLen = strlen(g_ProxyInfo.m_strProxyUser);
( ^. R5 N! }- `$ ?int nPassLen = strlen(g_ProxyInfo.m_strProxyPass);
struct authreq *m_authreq;
4 ~6 U  s/ x3 cm_authreq = (struct authreq *)buff;
5 n" b/ j9 t0 km_authreq->Ver = 1;
# X% P) {( {8 `6 D1 U7 |' pm_authreq->Ulen = nUserLen;
" r$ Q/ H/ o; j: B, ?9 {. z6 Qstrcpy(m_authreq->Name,g_ProxyInfo.m_strProxyUser);
0 _; V% E7 O4 Cm_authreq-&gtLen = nPassLen;
strcpy(m_authreq-&gtass,g_ProxyInfo.m_strProxyPass);
ClientSock.Send(buff,513);
3 q1 k1 N, k" U. V4 T( I8 O/ H6 Tstruct authans *m_authans;
( f' o- e, P8 w1 t4 W# Tm_authans = (struct authans *)buff;
) G. \4 W" D9 a8 dmemset(buff,0,600);
ClientSock.Receive(buff,600);
if(m_authans->Ver != 1 || m_authans->Status != 0)
% d+ P& G$ v# _: x" [! F) s' D3 d{
/ G3 V; Y3 W+ a3 m5 {m_sError = _T("代理服务器用户验证不成功!");
. W9 |, s( w0 m* KClientSock.Close();
6 K" j' o+ m3 q$ {9 u! S5 H; h* Breturn FALSE;
}
. q8 _6 B: K: |$ I}
struct sock5req2 *m_proxyreq2;
m_proxyreq2 = (struct sock5req2 *)buff;
m_proxyreq2->Ver = 5;
; W7 z* {; y) C3 [$ gm_proxyreq2->Cmd = 1;
: u7 d; h/ ]% [9 u' @m_proxyreq2->Rsv = 0;
m_proxyreq2->Atyp = 1;
unsigned long tmpLong = inet_addr(GetServerHostName());
unsigned short port = ntohs(GetPort());
memcpy(m_proxyreq2->other,&tmpLong,4);
" l# B. S0 f( V8 ]: c" kmemcpy(m_proxyreq2->other+4,&port,2);
ClientSock.Send(buff,sizeof(struct sock5req2)+5);
struct sock5ans2 *m_proxyans2;
memset(buff,0,600);
) s. B8 L/ J7 I: U+ y- V6 q4 ]. s( Lm_proxyans2 = (struct sock5ans2 *)buff;
2 p. J% o$ k: L' J7 v2 @5 WClientSock.Receive(buff,600);
; G% k3 B+ j5 A0 j8 V3 K) Bif(m_proxyans2->Ver != 5 || m_proxyans2->Rep != 0)
7 t! j& l. `# b' L9 f$ F7 W{
3 j! e- O( R; P$ a0 q; _9 Fm_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
! y- X& p6 `1 Ereturn FALSE;
( T" w0 d- k4 t0 I* c  s}
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. m8 b1 K9 _2 A' R; g8 |
//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();
9 {2 D# N9 I- G+ c' Qreturn FALSE;
  V1 ?* t% t# I1 x}
4 \3 B, J" O: u2 q2 ychar buff[600];
. ~9 K/ d) U5 _* R9 d  Psprintf( buff, "%s%s:%d%s","CONNECT ",GetServerHostName(),GetPort()," HTTP/1.1\r\nUser-Agent: MyApp/0.1\r\n\r\n");
ClientSock.Send(buff,strlen(buff)); //发送请求
8 Q+ M& U  H2 @6 w* amemset(buff,0,600);
ClientSock.Receive(buff,600);
: [1 d  q+ T: }, B; w! K7 Yif(strstr(buff, "HTTP/1.0 200 Connection established") == NULL) //连接不成功
{
0 q) ~% k7 d! R3 Rm_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
/ i8 b2 ^( D* H5 P" u. M! areturn FALSE;
}
2 q1 ]: n* Y- Q4 R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。