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📁 unix高级编程原吗
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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">               ● UNIX网络编程                       (BM: clown)                </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="316.htm">上一层</a>][<a href="409.htm">下一篇</a>]
<hr><p align="left"><small> /* <br>

  *编译是这样的 <br>

  *gcc -o synscan synscan.c -lpthread <br>

  */ <br>

#include <netdb.h> <br>

#include <sys/socket.h> <br>

#include <sys/types.h> <br>

#include <stdio.h> <br>

#include <errno.h> <br>

#include <sys/ioctl.h> <br>

#include <net/if.h> <br>

#include <signal.h> <br>

#include <netinet/ip.h> <br>

#include <netinet/in.h> <br>

#include <string.h> <br>

#include <arpa/inet.h> <br>

#include <netinet/tcp.h> <br>

#include <pthread.h> <br>

#define LOWPORT 1 <br>

#define HIGHPORT 1024 <br>

#define SEQ 12345 <br>

#define TCPSIZE sizeof(struct tcphdr) <br>

int sendSyn(int sockfd,u_long sourceIP,u_short sourcePort,u_long seqNum,stru <br>



ct sockaddr_in * dst); <br>

void * recv_packet(void * arg); <br>

struct sockaddr_in dest; <br>

int fd; <br>

struct tcphdr * tcp; <br>

u_short sourcePort=1234; <br>

struct servent * sptr; <br>

int startPort,endPort; <br>

unsigned short in_cksum(unsigned short * addr,int len) <br>

{/*计算较验和的*/ <br>

  int nleft=len; <br>

  int sum=0; <br>

  unsigned short * w=addr; <br>

  unsigned short answer=0; <br>

  while (nleft>1) <br>

  { <br>

    sum+=*w++; <br>

    nleft-=2; <br>

  } <br>

  if (nleft==1) <br>

  { <br>

    *(unsigned char *)(&answer)=*(unsigned char *)w; <br>



    sum+=answer; <br>

  } <br>

  sum=(sum>>16)+(sum & 0xffff); <br>

  sum+=(sum>>16); <br>

  answer=~sum; <br>

  return(answer); <br>

} <br>

int main(int argc,char **argv) <br>

{ <br>

int j; <br>

  struct hostent * phe; <br>

  pthread_t tid; <br>

 struct ifreq if_data; <br>

  u_long addr_p; <br>

 char* addr; <br>

  if ((argc!=2) && (argc!=4)) <br>

    printf("Usage: SynScan <host> [<startPort> <endPort>] \n"),exit(1); <br>

  switch (argc) <br>

  { <br>

    case  2: startPort=LOWPORT; <br>

             endPort=HIGHPORT; <br>

             break; <br>



    case  4: startPort=atoi(argv[2]); <br>

             endPort=atoi(argv[3]); <br>

             break; <br>

    default: printf("Usage:Synscan <host> [<startPort> <endPort>] \n"),exit( <br>

1); <br>

} <br>

if ((fd=socket(AF_INET,SOCK_RAW,IPPROTO_TCP))<0) <br>

 /* <br>

  *在这个fd上发数据,系统会自动给你加个IP头的 <br>

  *所以你只要自己构造TCP头就是了 <br>

  */ <br>

    perror("socket"); <br>

setuid(getuid()); /*放弃特权*/ <br>

strcpy (if_data.ifr_name,"eth0"); <br>

if (ioctl (fd, SIOCGIFADDR, &if_data) < 0) <br>

 {/* <br>

   *取名为eth0的的IP地址 <br>

   *这是个interface的地址 <br>

          */ <br>

 perror("ioctl"); <br>

 exit(1); <br>

 } <br>

 } <br>

memcpy ((void *) &addr_p, (void *) &if_data.ifr_addr.sa_data + 2, 4); <br>

/*把它放到addr_p中*/ <br>

if ((endPort-startPort+1)<1) <br>

 printf("please input right endport and startport\n"),exit(1); <br>

 bzero(&dest,sizeof(dest)); <br>

 dest.sin_family=AF_INET; <br>

if (phe=gethostbyname(argv[1])) <br>

    memcpy(&dest.sin_addr,phe->h_addr,phe->h_length); <br>

  else if (inet_aton(argv[1],&dest.sin_addr)<0) <br>

    perror("host"); <br>

  printf("Now starting scan...\n"); <br>

  fflush(stdout); <br>

if ((errno=pthread_create(&tid,NULL,recv_packet,NULL))<0) <br>

/*我用了一个线程来专门接收数据 <br>

 *这样就可以提高速度 <br>

 */ <br>

    perror("pthread:"); <br>

    for ( j=startPort ; j <= endPort; j++ ) <br>

    { <br>

          dest.sin_port=htons(j); <br>

          if (sendSyn(fd,addr_p,sourcePort,SEQ,&dest)<0) <br>

               perror("send"); <br>



    } <br>

pthread_join(tid,NULL); /*等待线程结束*/ <br>

} <br>

void * recv_packet(void * arg) <br>

{ /* <br>

   *接收数据的时候有点问题 <br>

   *如果一个数据包很久没有应答的话,我这个程序会等的很久的 <br>

   *按ctrl+c就可以终止 <br>

   *difijing他是简单的加了个超时机制 <br>

   *不过他创造了三个不同的套接口,够不清楚的 <br>

   *你看他的程序可能有点困难 <br>

   * <br>

   *这个程序关键关键的地方就是你创造了何种套接口 <br>

   *不知道你有没有理解我说的这个关键呢 <br>

   *以前那个SOCK_PACK那个套接口你可以读整个以太侦的 <br>

   *今天这个套接口可以读整个IP包的,但不能自己构造IP头 <br>

   *可以用setsockopt来设置使之可以自己构造IP头 <br>

   *还有一点就是较验和的问题,看了这个程序你应该对这些 <br>

   *比较了解了吧 <br>

   *如果还有什么问题的话,问我就是了 <br>

   *男生是不会介意的 <br>

   *男生是很愿意帮助女生的,xixi <br>



   */ <br>

int loopend; <br>

int all=0; <br>

int size; <br>

u_char readbuff[1600]; <br>

tcp=(struct tcphdr *)(readbuff+20); <br>

/*那个fd中读出的数据包括了IP头的所以+20*/ <br>

loopend=endPort-startPort+1; <br>

for (;;) <br>

  { <br>

  if ( all==loopend) return NULL; <br>

 size= read(fd,readbuff,1600); <br>

 if ( size<(20+20) )/*读出的数据小于两个头的最小长度的话continue*/ <br>

  continue; <br>

   if ( (ntohl(tcp->ack_seq)!=12346)|| (ntohs(tcp->dest)!=sourcePort)) <br>

     /*知道为什么是12346吗?如果你不清楚的话,看一下TCP/IP的书 <br>

       这句的目的是从所以数据中检索出tcp->ack_seq==12346(即SEQ+1) && <br>

       tcp->dest==sourecePort的数据 <br>

       也就是对方反应给你的那些数据包 <br>

     */ <br>

      continue; <br>

    /* RST/ACK  - no service listening on port */ <br>



    if (tcp->rst && tcp->ack) <br>

    { <br>

       all++; <br>

       continue; <br>

    } <br>

 /* <br>

  *原理我以前跟你说过了,比较简单 <br>

     *你看程序也应该看出什么原理来 <br>

     */ <br>

    /* SYN/ACK -Service listening on this port */ <br>

    if (tcp->ack && tcp->syn) <br>

    {/*这些已经没有什么了,就是系统调用*/ <br>

        if ((sptr=getservbyport(tcp->source,"tcp"))!=NULL) <br>

 {/*^[是这个字符,你看了那片autopost应该知道怎么输入了吧*/ <br>

         printf("2mPort:%5d   1mServer: %s7m\n",ntohs(tcp->source), <br>

sptr->s_name); <br>

 } <br>

 else <br>

          printf("2mPort:%5d 7m\n",ntohs(tcp->source)); <br>

       fflush(stdout); <br>

       all++; <br>

       continue; <br>



    } <br>

  }/* end for */ <br>

} <br>

int sendSyn(int sendSocket,u_long sourceIP,u_short sourcePort,u_long seq,str <br>

uct sockaddr_in * dst) <br>

{ <br>

  unsigned char netPacket[TCPSIZE]; <br>

  struct  tcphdr * tcp; <br>

  u_char * pPseudoHead; <br>

  u_char pseudoHead[12+sizeof(struct tcphdr)]; <br>

  u_short  tcpHeadLen; <br>

  memset(netPacket,0,TCPSIZE); <br>

  tcpHeadLen=htons(sizeof(struct tcphdr)); <br>

  tcp=(struct tcphdr *)netPacket; <br>

  tcp->source=htons(sourcePort); <br>

  tcp->dest=dst->sin_port; <br>

  tcp->seq=htonl(seq); <br>

  tcp->ack_seq=0; <br>

  tcp->doff=5; <br>

  tcp->syn=1; /*Syn的标志*/ <br>

  tcp->window=htons(10052); <br>

  tcp->check=0; <br>



  tcp->urg_ptr=0; <br>

 /********************************************/ <br>

 /* 以下用pseudoHead来放那些用于计数的字段,并构造它*/ <br>

  pPseudoHead=pseudoHead; <br>

  memset(pPseudoHead,0,12+sizeof(struct tcphdr)); <br>

  memcpy(pPseudoHead,&sourceIP,4); <br>

  pPseudoHead+=4; <br>

  memcpy(pPseudoHead,&dest.sin_addr,4); <br>

  pPseudoHead+=5; <br>

  memset(pPseudoHead,6,1); <br>

  pPseudoHead++; <br>

  memcpy(pPseudoHead,&tcpHeadLen,2); <br>

  pPseudoHead+=2; <br>

  memcpy(pPseudoHead,tcp,sizeof(struct tcphdr)); <br>

  /*上面就是根据那本书上说的照作就是了*/ <br>

 /************************************************/ <br>

  tcp->check=in_cksum((u_short *)pseudoHead,sizeof(struct tcphdr)+12); <br>

  return (sendto(sendSocket,netPacket,TCPSIZE,0,(struct sockaddr*)dst,sizeof <br>

(struct sockaddr_in))); <br>

} <br>

</small><hr>
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