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标题: 一段端口扫描的代码，原始套接字，怎么老是recvfrom收不到呢？ [打印本页]

作者: scu_guzo 时间: 2009-11-17 18:59
标题: 一段端口扫描的代码，原始套接字，怎么老是recvfrom收不到呢？

static int FIN_scan(const char *ip_addr, const unsigned short port)
{
struct sockaddr_in addr;
int sockfd;
fd_set fdset;
struct timeval timeout;
struct tcphdr *tcp;
struct ip *ip;
char buf[sizeof(struct tcphdr) + sizeof(struct ip)];
int buflen, addrlen;

addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = inet_addr("119.75.216.30"); //119.75.216.30百度

timeout.tv_sec = TIME_OUT;
timeout.tv_usec = 0;

memset(buf, 0, sizeof(buf));
sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);
ip = (struct ip *)buf;
tcp = (struct tcphdr *)(buf + sizeof(struct ip));
buflen = sizeof(struct tcphdr) + sizeof(struct ip);
addrlen = sizeof(struct sockaddr_in);

tcp->source = htons(55555);
tcp->dest = htons(port);
tcp->fin = 1;
tcp->doff = 5;

if (sendto(sockfd, buf, buflen, 0, (struct sockaddr *)&addr, addrlen)
      == buflen)
      printf("sendto successn");

if (recvfrom(sockfd, buf, buflen, 0, (struct sockaddr *)&addr,
      &addrlen) == buflen)
      printf("recvfrom successn"); //recvfrom收不到

return 1;
}

作者: hijohnny 时间: 2009-11-18 09:42
man sockaddr_ll

作者: scu_guzo 时间: 2009-11-18 10:57
标题: 回复 #2 hijohnny 的帖子
嗯谢了

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