[收藏]穿透代理服务器编程

天云上人

  作者 allfresh
1 B2 E+ e. t9 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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1 h9 e" |) r8 u; B//使用到的结构
8 q* q/ s% r/ Rstruct sock4req1
" I! |& m, W$ e  p  c{
. O  E/ }- X1 c3 f" o6 f( _char VN;
1 p: V8 P6 T! e3 S) Pchar CD;
8 l7 D& Q( N+ \0 B! Ounsigned short Port;
( w! Q# n- l; h. L  t& V8 |unsigned long IPAddr;
" h9 d0 ^8 g8 O6 B1 \7 B( m5 schar other[1];
};
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% X8 q  J: ~- p  q* e& Sstruct sock4ans1
) w' z) v7 A$ U: l7 {{
) n" T: W; {3 |char VN;
* p  \3 c" _6 b, ]2 ?- K3 dchar CD;
6 l7 R; u6 }- p2 S, u% `};
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9 I$ O& _$ o9 P$ Z/ fstruct sock5req1
{
char Ver;
char nMethods;
& z  o; i. R# |% I7 e% V" Rchar Methods[255];
};
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- @9 h, [) ], r+ {& q. ?struct sock5ans1
( k; \* X/ A& i3 `{
6 X6 _' P" a/ g$ Lchar Ver;
char Method;
};
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5 S! r9 J( A% K* }' _, W5 }struct sock5req2
1 h2 e+ k6 l. @  P' K6 n7 ]{
char Ver;
char Cmd;
char Rsv;
char Atyp;
& i* S" B9 b* o$ g* s3 O$ J- achar other[1];
};
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struct sock5ans2
5 p: h. n* X( y{
char Ver;
char Rep;
) T1 s: e) T+ W% u5 Y: ]char Rsv;
. e5 l0 L2 i! O( Z  h& |  S# [char Atyp;
2 p$ F+ w  D# \; s( dchar other[1];
7 g3 e$ e, H0 w( F; Z};
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; O" x7 x4 A; m" t" hstruct authreq
' j% \& w9 c5 U{
char Ver;
6 |+ R) U. C0 R. vchar Ulen;
char Name[255];
char PLen;
  n" I! g* Y; W! B8 N2 O$ Kchar Pass[255];
};
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struct authans
; ^3 G+ d6 X- z8 H{
char Ver;
! c9 y0 q5 m4 ^* I  Lchar Status;
};
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//通过Socks4方式代理
8 k& b- Q: v/ A& B: pif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
{
m_sError = _T("不能连接到代理服务器!");
/ q# W) |- Z* n1 a. H" ?+ X. zClientSock.Close();
5 k5 p+ `+ ?6 }* R; N7 ^return FALSE;
}
char buff[100];
' ^! {9 }+ V" w6 _- wmemset(buff,0,100);
struct sock4req1 *m_proxyreq;
: X, X4 @; K% {* Y6 j5 H6 Wm_proxyreq = (struct sock4req1 *)buff;
% \; t7 o" v$ u: S6 e2 m9 Z# k1 Sm_proxyreq->VN = 4;
m_proxyreq->CD = 1;
, l# F# G  c  Y$ @/ u3 l, _5 }  i' Lm_proxyreq-&gtort = ntohs(GetPort());
m_proxyreq->IPAddr = inet_addr(GetServerHostName());
ClientSock.Send(buff,9);
# C  s* X; d+ I6 _  k  Cstruct sock4ans1 *m_proxyans;
: f7 |5 H$ [. ^! c% am_proxyans = (struct sock4ans1 *)buff;
2 g) p1 Y8 a$ x* M2 Xmemset(buff,0,100);
0 S8 a# ~, M3 y& mClientSock.Receive(buff,100);
; d( v% h' |5 v" P2 Kif(m_proxyans->VN != 0 || m_proxyans->CD != 90)
/ G+ \" n& n0 l& q{
m_sError = _T("通过代理连接主站不成功!");
: k3 N8 L# _% N- e9 G' PClientSock.Close();
: H5 A, ^7 R5 D6 w; r2 p( creturn FALSE;
}
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+ ^! G8 F2 c% O5 Y+ |7 [
//通过Socks5方式代理
3 a, u3 q, L' ?$ B" w1 Bif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
7 h9 P1 C' b6 j) g+ `{
m_sError = _T("不能连接到代理服务器!");
6 d" n3 i& |) U$ R) T$ I2 UClientSock.Close();
return FALSE;
1 [0 L) ^- ~, k+ P  y# F1 C/ T6 Z}
char buff[600];
struct sock5req1 *m_proxyreq1;
4 g% S& r, m9 W2 S, bm_proxyreq1 = (struct sock5req1 *)buff;
/ s1 ]6 p! `5 r5 U- H4 j' bm_proxyreq1->Ver = 5;
m_proxyreq1->nMethods = 2;
+ x1 W1 i3 m; o. B6 {m_proxyreq1->Methods[0] = 0;
/ m# ~) I( l0 ]* Zm_proxyreq1->Methods[1] = 2;
ClientSock.Send(buff,4);
6 ?1 c, T, r% R$ s7 q( lstruct sock5ans1 *m_proxyans1;
1 u. l; k  U7 z" ^m_proxyans1 = (struct sock5ans1 *)buff;
8 ?, q% U7 z+ `# P, T) u0 dmemset(buff,0,600);
; r  M% _! p! [/ }* }" N9 ^ClientSock.Receive(buff,600);
, L7 x5 F9 ~/ |9 R9 {: i- ^if(m_proxyans1->Ver != 5 || (m_proxyans1->Method!=0 && m_proxyans1->Method!=2))
{
m_sError = _T("通过代理连接主站不成功!");
; G$ D+ G% v! K( S! C- aClientSock.Close();
return FALSE;
0 w/ s; ~! B5 s3 J% o6 h}
if(m_proxyans1->Method == 2)
: _1 n1 d6 R& h( }" r7 P{
* ~1 y" s, [4 G/ y8 W2 E, O5 hint nUserLen = strlen(g_ProxyInfo.m_strProxyUser);
int nPassLen = strlen(g_ProxyInfo.m_strProxyPass);
struct authreq *m_authreq;
  ~: f5 _2 ?) U9 o; wm_authreq = (struct authreq *)buff;
. ^8 A- x$ Z  L. y; n/ R4 |  C- @m_authreq->Ver = 1;
m_authreq->Ulen = nUserLen;
. N6 _8 [1 p+ J0 d( K4 Qstrcpy(m_authreq->Name,g_ProxyInfo.m_strProxyUser);
  L" H: h7 q& S- `0 jm_authreq-&gtLen = nPassLen;
strcpy(m_authreq-&gtass,g_ProxyInfo.m_strProxyPass);
+ v. ]7 \4 r) U1 f8 x) l% c$ JClientSock.Send(buff,513);
struct authans *m_authans;
- P) b, e  K% A0 T9 W/ s: [m_authans = (struct authans *)buff;
; p9 w: Y9 U6 d4 P# J1 fmemset(buff,0,600);
ClientSock.Receive(buff,600);
  L+ S6 Z* A) N) @1 X9 pif(m_authans->Ver != 1 || m_authans->Status != 0)
0 y. O& O5 ]; [7 F7 q, g{
& @  z8 ~$ U5 R3 km_sError = _T("代理服务器用户验证不成功!");
ClientSock.Close();
1 }1 c' R4 r6 W" {return FALSE;
}
}
+ F* y! C9 [% Xstruct sock5req2 *m_proxyreq2;
m_proxyreq2 = (struct sock5req2 *)buff;
m_proxyreq2->Ver = 5;
: o! }9 W& Y& A- A2 Am_proxyreq2->Cmd = 1;
m_proxyreq2->Rsv = 0;
m_proxyreq2->Atyp = 1;
, _6 J. P* N! O, R, v- c: tunsigned long tmpLong = inet_addr(GetServerHostName());
$ }1 N; d  |( W3 r) ounsigned short port = ntohs(GetPort());
, D9 @$ R* g- {* u9 `memcpy(m_proxyreq2->other,&tmpLong,4);
memcpy(m_proxyreq2->other+4,&port,2);
. g- s- w% O2 n/ l! ]0 dClientSock.Send(buff,sizeof(struct sock5req2)+5);
3 m8 ?, z  O; M: Fstruct sock5ans2 *m_proxyans2;
memset(buff,0,600);
m_proxyans2 = (struct sock5ans2 *)buff;
" f' {9 @# R2 n9 ^# S) _, _6 @ClientSock.Receive(buff,600);
# @9 g& k1 D6 r5 F8 [% l! j. n! Sif(m_proxyans2->Ver != 5 || m_proxyans2->Rep != 0)
6 ]% d' [0 @. T5 J{
' i" S8 }% A* q( h  g! o2 km_sError = _T("通过代理连接主站不成功!");
+ L- H1 B' a) i9 M' u; N6 [0 lClientSock.Close();
return FALSE;
}
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//通过HTTP方式代理
if( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
{
2 U" O4 |4 l2 z: Qm_sError = _T("不能连接到代理服务器!");
" c. P* l2 w7 t8 F5 U  e8 xClientSock.Close();
( e  Z( C! ], k6 f( H& B; W) b; zreturn FALSE;
" A* Z! h+ V5 l% l}
char buff[600];
sprintf( buff, "%s%s:%d%s","CONNECT ",GetServerHostName(),GetPort()," HTTP/1.1\r\nUser-Agent: MyApp/0.1\r\n\r\n");
! M/ K7 `% F2 z4 M) M  R% b7 FClientSock.Send(buff,strlen(buff)); //发送请求
9 X% n9 \) j: n: y9 {0 amemset(buff,0,600);
" l" m9 Z/ ]" ]! a, M) C  tClientSock.Receive(buff,600);
7 K) ?# S/ A. A$ B3 o* A* ^if(strstr(buff, "HTTP/1.0 200 Connection established") == NULL) //连接不成功
1 q' K, R* Z; _& |, w9 |! M{
" u$ o& f+ L- x" X" n0 Um_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
return FALSE;
}
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。