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| 关键词： nbsp buf 代理 http len ptoken connect int proxyaddr sset |
作者：无双 来源：http://www.loveunix.net/ socks5代理可以看rfc 1928socks5的用户名口令认证方法看rfc 1929http代理可以看 rfc2616socks5代理可以支持tcp和udp 而http只支持tcp所以这个代理转换器只支持tcp写作原因很多软件都有socks5认证方法 但是它们不支持http认证方法而从原理上可以使用http认证方法(因为它们没有使用udp)所以写这个软件可以方便的使其它程序可以使用http代理如联众 或是foxmail CODE #include <winsock2.h>#include <stdio.h>#include <stdlib.h>#define INIT_SOCKET(){WSADATA wsadata;WSAStartup(MAKEWORD(2,2),&wsadata);}#define CLOSESOCKET(x) closesocket(x)#define CLEAN_SOCKET() {WSACleanup();}// http.c 实现http代理功能#define PROTO_EXCHANGE_TIMEOUT 15#define PROTO_RECVRESP_TIMEOUT 75#define PROTO_SENDRESP_TIMEOUT 10#define WAIT_AND_RECV(sd,buf,len,waittime,recvflags) do{\ struct fd_set sset;\ struct timeval waited;\ waited.tv_sec = waittime;waited.tv_usec = 0;\ FD_ZERO(&sset);FD_SET(sd,&sset);\ if(select(sd+1,&sset,NULL,NULL,&waited) != 1 || (len = recv(sd,buf,len,recvflags)) == -1 )\ len = -1;\}while(0);#define DEBUG_DUMP printfstatic int httpproxy_connect(const char*proxyaddr,int proxyport, const char*dstaddr,int dstport){ int proxysd = -1; char buf[2048]; int len; char *ptoken; int status; struct sockaddr_in inaddr; if( !proxyaddr || !proxyaddr[0] || proxyport < 1 ||!dstaddr || !dstaddr[0] ) return -1; DEBUG_DUMP("代理:%s:%d,目标:%s:%d\n",proxyaddr,proxyport,dstaddr,dstport); len = sizeof(inaddr); memset(&inaddr,0,len); if( (inaddr.sin_addr.s_addr = inet_addr(proxyaddr) ) == INADDR_NONE ) return -1; inaddr.sin_family = AF_INET; inaddr.sin_port = htons(proxyport); // connect to proxy if((proxysd = socket(AF_INET,SOCK_STREAM,0)) == -1 ) return -1; if( connect(proxysd,(struct sockaddr*)&inaddr,len)) goto errorparse; // 发送connect请求并判断返回,根据HTTP协议说明,详细内容请看RFC2616 // HTTP代理使用CONNECT指令实现，CONNECT时指定选端的地址与端口号, // 当代理服务器返回成功后(状态值是2xx),后面的代理服务器不再对此连接的数据 // 进行HTTP协议处理 if( dstport > 0 ) len = sprintf(buf,"CONNECT %s:%d HTTP/1.1\r\n\r\n",dstaddr,dstport); else len = sprintf(buf,"CONNECT %s HTTP/1.1\r\n\r\n",dstaddr); if( send(proxysd,buf,len,0) != len ){ DEBUG_DUMP("发送CONNECT请求失败:包内容:%s\n",buf); goto errorparse; } len = sizeof(buf)-1; WAIT_AND_RECV(proxysd,buf,len,PROTO_RECVRESP_TIMEOUT,MSG_PEEK); if( len == -1){ DEBUG_DUMP("接收CONNECT响应失败\n"); goto errorparse; } buf[len] = 0; DEBUG_DUMP("CONNECT响应为:%s|\n",buf); if( strnicmp(buf,"HTTP/1.",7) || (!strstr(buf,"\r\n\r\n") && !strstr(buf,"\n\n"))) goto errorparse; ptoken = buf; while(!isspace(*ptoken) && *ptoken) ptoken ++; status = atoi(ptoken); if( status < 300 && status > 199 ){ ptoken = strstr(buf,"\r\n\r\n"); if( ptoken ) len = ptoken - buf +4; else{ ptoken = strstr(buf,"\n\n"); len = ptoken - buf +2; } WAIT_AND_RECV(proxysd,buf,len,PROTO_RECVRESP_TIMEOUT,0); return proxysd; }errorparse: CLOSESOCKET(proxysd); return -1;}// sd [in] 使用socks5的客户端的连接id// proxyaddr [in] http代理地址// proxyport [in] http代理端口// return:// -1 失败// >=0 与http代理的连接idstatic int socks5_accept(int sd,const char *proxyaddr,int proxyport){ unsigned char buf[512]; int len = 2; int i = 0; char dstaddr[260]; int dstport; if( !proxyaddr || !proxyaddr[0] || proxyport <1 ) return -1; // 处理协商,现在只处理无认证情况,无论对方会不会处理这种情况 // 没有要求无认证方式,sorry,那我就不理它 // 另外只处理SOCKS5的CONNECT命令,其它不处理 WAIT_AND_RECV(sd,(char*)buf,len,PROTO_EXCHANGE_TIMEOUT,0); if( len != 2 || buf[0] != 5 ){ DEBUG_DUMP("接收socks5协商包失败,len:%d,buf[0]:%d\n",len,buf[0]); return -1; } len = buf[1]; i = len; WAIT_AND_RECV(sd,(char*)buf,i,PROTO_EXCHANGE_TIMEOUT,0); if( len != i ){ DEBUG_DUMP("接收socks5协商包失败,想接收%d,收到:%d\n",len,i); return -1; } for( i = 0;i< len && buf[i];i++ ); if( i == len ){ DEBUG_DUMP("用户没有请求socks5无认证方法:\n"); return -1; } buf[0] = 5; buf[1] = 0; if( send(sd,(char*)buf,2,0) != 2) return -1; len = 5; WAIT_AND_RECV(sd,(char*)buf,len,PROTO_RECVRESP_TIMEOUT,0); if( len != 5 || buf[0] != 5 || buf[1] != 1 ){ DEBUG_DUMP("处理socks5CONNECT命令失败:len:%d,buf[0]:0x%x,buf[1]:0x%x\n",len,buf[0],buf[1]); return -1; } switch( buf[3] ){ case 1: // 是IP地址 len = 5; WAIT_AND_RECV(sd,(char*)buf+5,len,PROTO_RECVRESP_TIMEOUT,0); if( len != 5 ){ DEBUG_DUMP("处理socks5CONNECT命令[IP方式]失败:len:%d\n",len); return -1; } { struct in_addr addr; memcpy((char*)&addr.s_addr,buf+4,4); strcpy(dstaddr,inet_ntoa(addr)); dstport = ntohs(*(unsigned short*)(buf+8)); } break; case 3: // 是域方式 len = buf[4]+2; WAIT_AND_RECV(sd,(char*)buf+5,len,PROTO_RECVRESP_TIMEOUT,0); if( len != buf[4]+2 ){ DEBUG_DUMP("处理socks5CONNECT命令[域方式]失败:len:%d\n",len); return -1; } memcpy(dstaddr,buf+5,buf[4]); dstaddr[buf[4]] = 0; dstport = ntohs(*(unsigned short*)(buf+5+buf[4])); break; default: DEBUG_DUMP("处理socks5CONNECT命令[]失败:未知方式:type:0x%x\n",buf[3]); return -1; } return httpproxy_connect(proxyaddr,proxyport,dstaddr,dstport);}int listenport(int port,const char*addr){ int len = sizeof(struct sockaddr_in); struct sockaddr_in bindaddr; int sd = socket(AF_INET,SOCK_STREAM,0); if( sd == -1) return -1; memset(&bindaddr,0,len); bindaddr.sin_family = AF_INET; bindaddr.sin_port = htons(port); if( addr && addr[0] ) bindaddr.sin_addr.s_addr = inet_addr(addr); if( bind ( sd,(struct sockaddr*)&bindaddr,&len) || listen(sd,100 )){ DEBUG_DUMP("打开端口失败,port:%d\n",port); CLOSESOCKET(sd); return -1; } return sd;}void running(int sd){ int ad; if( sd == -1 ) return; while(1){ int proxyid; char buf[10240]; int len; int maxid; int actcount; ad = accept(sd,NULL,NULL); if( ad == -1 ) break; DEBUG_DUMP("有客户连接,id:%d\n",ad); if((proxyid = socks5_accept(ad,"172.16.68.21",80)) == -1 ){ CLOSESOCKET(ad); continue; } // 进行代理转发工作 maxid = ad > proxyid? ad:proxyid; while( ad > -1 ){ struct timeval waittime = {10,0}; struct fd_set sset; FD_ZERO(&sset); FD_SET(ad,&sset); FD_SET(proxyid,&sset); actcount = select(maxid+1,&sset,NULL,NULL,&waittime); while(actcount > 0 ){ int actid = FD_ISSET(proxyid,&sset)?proxyid:ad; int sendid = actid == ad? proxyid:ad; FD_CLR(actid,&sset); len = sizeof(buf)-1; WAIT_AND_RECV(actid,buf,len,10,0); if( len > 0 ){ buf[len] = 0; send(sendid,buf,len,0); DEBUG_DUMP("%d接口活动,内容为:%s\n",actid,buf); } else{ DEBUG_DUMP("接收失败,id:%d\n",actid); CLOSESOCKET(ad); ad = -1; break; } actcount --; } } // 某一方已经关闭,继续下一组转发 CLOSESOCKET(proxyid); } CLOSESOCKET(sd);}main(){ int ld; INIT_SOCKET(); ld = listenport(1080,NULL); if( ld != -1) running(ld); else DEBUG_DUMP("监听失败\n"); CLEAN_SOCKET();} http及socks5代理只是在CONNECT时进行协商后面的操作不需要附加的信息同时代理也不会对数据进行解释 只是进行转发这只是一个测试程序 可以自己使用httpproxy_connect与socks5_accept来实现自己的代理转换程序另外在flashfxp上测试成功 在foxmail上还没有测试成功 主要函数说明httpproxy_connect通过http代理创建到目标机器的连接 socks5_accept接收socks5连接请求,并把它转换成http代理,创建http代理通道成功后返回http代理通道的socketid 以上两个失败都返回-1创建成功后客户端 <-数据-->socks5 sd <---数据--->http proxy sd<---->目标 |
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