[收藏]穿透代理服务器编程

天云上人

  作者 allfresh
2 `2 _& e* E. c文章原始出处 www.allfresh.net/program/proxy.htm
wwww.chin aitpower.comJZM2iofLWRmFIxU68q4I3qxHU
正文
  Y6 m/ y2 P2 s3 q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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: y) D  V8 i. \. v* }" Q$ x* w//使用到的结构
struct sock4req1
{
" c/ ^4 L6 ]* t4 [6 n) @+ t5 Rchar VN;
char CD;
  u0 |4 Y! o5 Y: ounsigned short Port;
) D( r4 A5 @' ~- M7 Q4 Q# G* yunsigned long IPAddr;
char other[1];
; b/ G+ M( Z% m$ I( q# Y, ]};
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struct sock4ans1
0 }. w, I" d; ^$ s) G+ L2 `. _/ z+ f5 x{
& |8 ]+ a4 j0 Hchar VN;
$ T0 W7 B- m, E2 Q2 {# f- ^7 v( Qchar CD;
};
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struct sock5req1
{
char Ver;
char nMethods;
char Methods[255];
8 G+ @; p1 L7 B+ E};
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0 T4 ]* o+ N0 f; E6 Hstruct sock5ans1
{
char Ver;
char Method;
};
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# S0 K7 }- x; I0 e* H1 Istruct sock5req2
" ?1 H' Z( r! L{
; z/ H5 F* h! h( I! s& b  T: Qchar Ver;
6 l$ F4 u" [* w" z0 @- P$ Pchar Cmd;
char Rsv;
char Atyp;
; F1 x' W* @/ ]0 Pchar other[1];
( s; j1 W- a- K+ y0 P, `3 f};
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/ `8 c: _4 {6 j% o6 [struct sock5ans2
{
7 S$ X% ?4 @2 I7 M: E5 }1 uchar Ver;
char Rep;
( D% r! o9 e( E6 p5 G2 |char Rsv;
char Atyp;
. Z- Y! J# {& m2 P0 {char other[1];
};
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/ ]& \, j/ E) h* v1 Bstruct authreq
; N8 L; W& p: \9 }  u{
char Ver;
char Ulen;
char Name[255];
3 V6 k3 I! ]- f, A1 Y- Lchar PLen;
char Pass[255];
2 Z+ a2 c4 @+ r, r};
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4 f5 S' K, a* a7 _% [  Q& Ostruct authans
* w( ^' [" B) Q# ?0 V% u{
char Ver;
char Status;
  }7 [" b7 E) m8 R0 ]* z};
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; O7 v/ X- h4 m" T9 T//通过Socks4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();
0 P2 Y0 o9 q4 }- i% t! @# h: wreturn FALSE;
0 O5 Z9 P# m6 L9 C' T}
* d; p6 l( _9 z  A( Tchar buff[100];
6 H7 `/ c  V* S# x0 [- Z4 gmemset(buff,0,100);
struct sock4req1 *m_proxyreq;
  `  D0 D2 \( b2 y  a/ Z4 m9 A" `m_proxyreq = (struct sock4req1 *)buff;
m_proxyreq->VN = 4;
m_proxyreq->CD = 1;
2 P; c) k& q; K1 U4 p5 }m_proxyreq-&gtort = ntohs(GetPort());
% U! g' u- ?- E& f; Em_proxyreq->IPAddr = inet_addr(GetServerHostName());
! r) F. ?8 P" _+ o( [. ]) o. RClientSock.Send(buff,9);
struct sock4ans1 *m_proxyans;
5 m) u% T1 A) y% R) {3 f  H( Qm_proxyans = (struct sock4ans1 *)buff;
* O) ^9 m2 b1 b: J. r* ememset(buff,0,100);
ClientSock.Receive(buff,100);
) Q: U; V% p8 |: T8 g) ?# `if(m_proxyans->VN != 0 || m_proxyans->CD != 90)
( U& z2 m$ W9 w2 t3 x: \3 X6 D, }{
m_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
return FALSE;
}
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//通过Socks5方式代理
# O: E6 h) j- {, Pif( !ClientSock.Connect( g_ProxyInfo.m_strProxyIP,g_ProxyInfo.m_nProxyPort) )
  S( h6 ^6 E  p6 `- p{
. i6 c5 B. B$ O0 J# y! ?. `& vm_sError = _T("不能连接到代理服务器!");
* |8 t2 b: S4 E' ]8 AClientSock.Close();
return FALSE;
}
& o/ i3 X; M! e1 `char buff[600];
+ O" Q4 u* r. O! D/ ]  j2 o7 gstruct sock5req1 *m_proxyreq1;
m_proxyreq1 = (struct sock5req1 *)buff;
& D/ E/ O- R1 k" ~7 km_proxyreq1->Ver = 5;
m_proxyreq1->nMethods = 2;
m_proxyreq1->Methods[0] = 0;
& n8 A% m( O' ]3 W! p' y  \m_proxyreq1->Methods[1] = 2;
, D* N$ o: h  NClientSock.Send(buff,4);
struct sock5ans1 *m_proxyans1;
m_proxyans1 = (struct sock5ans1 *)buff;
memset(buff,0,600);
" r& S0 A6 A+ B4 n6 L+ ?/ P% WClientSock.Receive(buff,600);
if(m_proxyans1->Ver != 5 || (m_proxyans1->Method!=0 && m_proxyans1->Method!=2))
{
# n4 }7 f' r! nm_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
return FALSE;
}
6 U* e# Q! R5 ?7 kif(m_proxyans1->Method == 2)
4 _1 o; Z0 V  B" Z5 E{
int nUserLen = strlen(g_ProxyInfo.m_strProxyUser);
2 w$ a5 o' ~+ H/ N/ Hint nPassLen = strlen(g_ProxyInfo.m_strProxyPass);
0 p1 w5 m- e# ]& N2 estruct authreq *m_authreq;
( l7 e) @: Z: K( g/ Sm_authreq = (struct authreq *)buff;
m_authreq->Ver = 1;
m_authreq->Ulen = nUserLen;
strcpy(m_authreq->Name,g_ProxyInfo.m_strProxyUser);
9 n3 O1 D! v7 `! Um_authreq-&gtLen = nPassLen;
. ]" F% p  P( T. u+ e7 X- Sstrcpy(m_authreq-&gtass,g_ProxyInfo.m_strProxyPass);
ClientSock.Send(buff,513);
# v! E& I5 W) M8 m2 U% _* lstruct authans *m_authans;
& X! a! h4 d# ]$ Y" `m_authans = (struct authans *)buff;
memset(buff,0,600);
ClientSock.Receive(buff,600);
6 `9 X  e& K% g6 k# ^4 wif(m_authans->Ver != 1 || m_authans->Status != 0)
{
4 x. L( `' q6 p/ }" |m_sError = _T("代理服务器用户验证不成功!");
2 V/ x( a" f2 B# xClientSock.Close();
  {( D1 a1 ]9 m2 w/ K  vreturn FALSE;
' O& U# `6 }! L1 P, d}
* N' M1 l0 N3 X, {0 a}
! r9 K- b, s) W9 Z0 ~struct sock5req2 *m_proxyreq2;
5 m0 a& T$ M$ B1 z2 Q2 }1 um_proxyreq2 = (struct sock5req2 *)buff;
m_proxyreq2->Ver = 5;
. P! d9 e8 E3 g- \  C4 Hm_proxyreq2->Cmd = 1;
& V/ N( m* E' T6 ^. v6 qm_proxyreq2->Rsv = 0;
m_proxyreq2->Atyp = 1;
) Z+ a0 Y" a0 f$ l- j( ]4 vunsigned long tmpLong = inet_addr(GetServerHostName());
unsigned short port = ntohs(GetPort());
memcpy(m_proxyreq2->other,&tmpLong,4);
memcpy(m_proxyreq2->other+4,&port,2);
ClientSock.Send(buff,sizeof(struct sock5req2)+5);
struct sock5ans2 *m_proxyans2;
6 K% H5 P6 J6 v- W; Ymemset(buff,0,600);
3 ]5 ?' U* i: i3 i: C1 c. d7 Tm_proxyans2 = (struct sock5ans2 *)buff;
ClientSock.Receive(buff,600);
3 m% }' |0 ?/ mif(m_proxyans2->Ver != 5 || m_proxyans2->Rep != 0)
- Q% S7 Q9 G7 Z{
! J! n# `/ c* ?9 u4 }6 _( dm_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
" _5 I+ ?3 ]$ L0 ^# X, e* B. mreturn FALSE;
7 v: Z2 t# p9 n6 S3 O}
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$ a9 D- T) \+ H6 _1 A) l
0 r* ]$ K/ ^- s! q1 c6 i. K//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!");
# a* F  ^) c9 |# ?# c6 y# iClientSock.Close();
! u5 `( t' f3 n% R7 k6 V* |return FALSE;
}
- w) @1 p6 d: C9 w, Q4 a! c! f8 |char buff[600];
; }: X& @$ D- U# `sprintf( buff, "%s%s:%d%s","CONNECT ",GetServerHostName(),GetPort()," HTTP/1.1\r\nUser-Agent: MyApp/0.1\r\n\r\n");
+ T, y: c/ E/ J# h$ E# i9 nClientSock.Send(buff,strlen(buff)); //发送请求
memset(buff,0,600);
ClientSock.Receive(buff,600);
: `% n2 m2 I8 ^1 s* Wif(strstr(buff, "HTTP/1.0 200 Connection established") == NULL) //连接不成功
{
m_sError = _T("通过代理连接主站不成功!");
ClientSock.Close();
8 e: V# t9 V4 i# e) i0 Qreturn 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。