79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* nmap.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/04/22 14:10:24 by jhalford #+# #+# */
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/* Updated: 2017/04/23 18:18:41 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "nmap.h"
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unsigned short cksum(void *b, int len)
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{
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unsigned short *buf = b;
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unsigned int sum=0;
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for (sum = 0; len > 1; len -= 2)
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sum += *((unsigned short*)buf++);
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if (len == 1)
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sum += *(unsigned char*)buf;
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sum = (sum >> 16) + (sum & 0xFFFF);
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return (~(sum + (sum >> 16)));
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}
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int nmap_scan_tcp(t_data *data, struct iphdr *iph, t_host *host, int port)
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{
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t_tcp_packet packet;
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packet.iph = *iph;
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tcphdr_init(&packet.tcph);
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packet.tcph.dest = htons(port);
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packet.tcph.source = htons(data->src_port);
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packet.tcph.syn = 1;
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packet.tcph.check = cksum(&packet, sizeof(t_tcp_packet));
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if (sendto(host->sock_tcp, &packet, sizeof(packet), 0, host->addr, host->addrlen) < 0)
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{
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perror("sendto");
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exit(1);
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}
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printf("packet sent\n");
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sleep(2);
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return (0);
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}
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/* int nmap_scan(char *host, int port, int scan) */
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/* { */
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/* (void)scan; */
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/* nmap_scan_syn(sockfd, servinfo); */
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/* return (0); */
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/* } */
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void nmap(t_data *data)
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{
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t_list *list;
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t_host *host;
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struct iphdr iph;
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list = data->host;
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if (!list)
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return ;
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for (host = list->content; list != NULL; list = list->next )
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{
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printf("scanning %s...\n", host->dn);
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iphdr_init(&iph);
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iph.protocol = IPPROTO_TCP;
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iph.daddr = *(int32_t*)host->addr;
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iph.tot_len = sizeof(t_tcp_packet);
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nmap_scan_tcp(data, &iph, host, 80);
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break ;
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}
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}
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