/* 应各位的要求， 贴上Happy的原作.         --calvin@scut*/
/* free proxy搜索程序,for UNIX                          */
/* 用法: 程序名  起始IP地址  结束IP地址   日志文件      */
/* 本程序将把搜索结果存于日志文件中                     */
/*  Author: Happy(Netguy)                               */

#include <stdio.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
/* 如果编译通不过,可以把下面一行改为 #include <sys/ioctl.h>  */
#include       "/usr/ucbinclude/sys/ioctl.h"

#define N    11

int              port[N]={80,81,88,8083,8080,8001,8888,3128,3124,3000,1080};
                          /* 欲搜的端口号 */
int              status=-1;
char             serverName[20];
u_char           p1,p2,p3,p4;
int              sockfd=-1;
struct timeval   timeout={2,0};
struct fd_set    mask;
FILE             *f=NULL;
int              err;
int              errlen;
u_long           startIP,endIP,k;

void terminate(void)                    /* 异常中止处理子程序 */
{
    p1=(u_char)( (k>>24) & 0xFF);
    p2=(u_char)( (k>>16) & 0xFF);
    p3=(u_char)( (k>>8 ) & 0xFF);
    p4=(u_char)(  k      & 0xFF);
    fprintf(f,"%d.%d.%d.%d killed.\n",p1,p2,p3,p4);
    fclose(f);
    if(sockfd>0) close(sockfd);
    exit(0);
}

void findProxy(u_long addr)
{
        int i;
        struct sockaddr_in host;

/*  若连上了主机,则看其所有有可能提供proxy服务的端口 */

        for(i=0;i<N;i++)
      {
        host.sin_family=AF_INET;
        host.sin_addr.s_addr=htonl(addr);
        host.sin_port=htons(port[i]);

        if ( (sockfd=socket(AF_INET,SOCK_STREAM,0))<0 )
        { fprintf(f," Error open socket\n");
          exit(-1);
        }
 

        /* 试连一个可能提供proxy服务的一个端口  */
        /* O_NDELAY = FNDELAY = O_NONBLOCK */

        if(fcntl(sockfd,F_SETFL,O_NDELAY) < 0 )   /* 非阻塞式socket */
        { fprintf(f,"fcntl() error\n");
          exit(-1);
        }
        status=connect(sockfd,(struct sockaddr *)& host,sizeof(host));
        timeout.tv_sec=1;
        timeout.tv_usec=0;                      /* 超时限制 */
        FD_ZERO( & mask);
        FD_SET(sockfd,& mask);
        status=select(sockfd+1,(struct fd_set *)0,& mask, (struct fd_set
*)0,& timeout);
        switch(status)
        { case -1:
                  fprintf(f,"select error\n");
                  fclose(f);
                  close(sockfd);
                  exit(-1);
          case 0:                               /* 连接超时 */
                  close(sockfd);
                  return;
          default:                              /* 连上了 */
                  if(  FD_ISSET(sockfd,& mask) )
                  { err=1;
                    errlen=1;
                    getsockopt(sockfd,SOL_SOCKET,SO_ERROR,(char
*)&err,&errlen);
                    if(err==0)
                       fprintf(f,"%s\t%d\n",serverName,port[i]);
                  }
        }
        close(sockfd);
        fflush(f);
      }
}

main(int argc,char *argv[])
{

  int i;

  if(argc!=4)
  { printf("Usage: %s  startIP endIP logFile\n",argv[0]);
    exit(-1);
  }

  startIP=ntohl(inet_addr(argv[1]));            /* 搜索的IP范围 */
  endIP=ntohl(inet_addr(argv[2]));
  if(startIP>endIP)
  { k=startIP;
    startIP=endIP;
    endIP=k;
  }

  f=fopen(argv[3],"a");                 /* 打开日志文件 */
  if(f==NULL)
  { printf("error open log file: %s\n",argv[3]);
    exit(-1);
  }
  fprintf(f,"%s--------->%s\n",argv[1],argv[2]);
  fflush(f);

  printf("Searching proxy...\n");
  printf("%s----------->%s\n",argv[1],argv[2]);
  printf("\tport:\n");
  for( i=0;i<N;i++)  printf("\t%d\n",port[i]);

  signal(SIGTERM,terminate);            /* 异常中止处理 */
  switch(fork())
  { case 0:                             /* 子进程继续 */
         break;
    case -1:                            /* 出错       */
         printf("fork() error\n");
         exit(-1);
    default:                            /* 父进程结束 */
         fclose(f);
         exit(0);
  }

  setpgrp();

  i=open("/dev/tty",O_RDWR);            /* 切断与控制台的联系 */
  if(i>=0)
  {  ioctl(i,TIOCNOTTY,0);
     close(i);
  }
  else { fprintf(f,"TTY eacape error\n"); fflush(f); }

  for(k=startIP;k<=endIP;k++)
  { if( (k % 256)==0)  continue;       /* localhost */
    if( (k % 256)==255) continue;      /* broadcast */
    p1=(u_char)( (k>>24) & 0xFF);
    p2=(u_char)( (k>>16) & 0xFF);
    p3=(u_char)( (k>>8 ) & 0xFF);
    p4=(u_char)(  k      & 0xFF);
    sprintf(serverName,"%d.%d.%d.%d",p1,p2,p3,p4);
    findProxy(k);
  }
  fprintf(f,"All done\n");
  fclose(f);
}

--
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