106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
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--- ./tcpkill.c.orig 2001-03-17 09:10:43.000000000 +0100
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+++ ./tcpkill.c 2014-07-22 13:20:14.000000000 +0200
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@@ -39,17 +39,18 @@
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static void
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tcp_kill_cb(u_char *user, const struct pcap_pkthdr *pcap, const u_char *pkt)
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{
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- struct libnet_ip_hdr *ip;
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+ struct libnet_ipv4_hdr *ip;
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struct libnet_tcp_hdr *tcp;
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- u_char ctext[64], buf[IP_H + TCP_H];
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+ u_char ctext[64];
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u_int32_t seq, win;
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- int i, *sock, len;
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+ int i, len;
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+ libnet_t *l;
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- sock = (int *)user;
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+ l = (libnet_t *)user;
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pkt += pcap_off;
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len = pcap->caplen - pcap_off;
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- ip = (struct libnet_ip_hdr *)pkt;
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+ ip = (struct libnet_ipv4_hdr *)pkt;
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if (ip->ip_p != IPPROTO_TCP)
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return;
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@@ -57,34 +58,31 @@
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if (tcp->th_flags & (TH_SYN|TH_FIN|TH_RST))
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return;
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- libnet_build_ip(TCP_H, 0, 0, 0, 64, IPPROTO_TCP,
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- ip->ip_dst.s_addr, ip->ip_src.s_addr,
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- NULL, 0, buf);
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-
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- libnet_build_tcp(ntohs(tcp->th_dport), ntohs(tcp->th_sport),
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- 0, 0, TH_RST, 0, 0, NULL, 0, buf + IP_H);
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-
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seq = ntohl(tcp->th_ack);
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win = ntohs(tcp->th_win);
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snprintf(ctext, sizeof(ctext), "%s:%d > %s:%d:",
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- libnet_host_lookup(ip->ip_src.s_addr, 0),
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+ libnet_addr2name4(ip->ip_src.s_addr, LIBNET_DONT_RESOLVE),
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ntohs(tcp->th_sport),
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- libnet_host_lookup(ip->ip_dst.s_addr, 0),
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+ libnet_addr2name4(ip->ip_dst.s_addr, LIBNET_DONT_RESOLVE),
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ntohs(tcp->th_dport));
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- ip = (struct libnet_ip_hdr *)buf;
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- tcp = (struct libnet_tcp_hdr *)(ip + 1);
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-
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for (i = 0; i < Opt_severity; i++) {
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- ip->ip_id = libnet_get_prand(PRu16);
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seq += (i * win);
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- tcp->th_seq = htonl(seq);
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- libnet_do_checksum(buf, IPPROTO_TCP, TCP_H);
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+ libnet_clear_packet(l);
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- if (libnet_write_ip(*sock, buf, sizeof(buf)) < 0)
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- warn("write_ip");
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+ libnet_build_tcp(ntohs(tcp->th_dport), ntohs(tcp->th_sport),
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+ seq, 0, TH_RST, 0, 0, 0, LIBNET_TCP_H,
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+ NULL, 0, l, 0);
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+
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+ libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_TCP_H, 0,
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+ libnet_get_prand(LIBNET_PRu16), 0, 64,
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+ IPPROTO_TCP, 0, ip->ip_dst.s_addr,
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+ ip->ip_src.s_addr, NULL, 0, l, 0);
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+
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+ if (libnet_write(l) < 0)
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+ warn("write");
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fprintf(stderr, "%s R %lu:%lu(0) win 0\n", ctext, seq, seq);
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}
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@@ -95,8 +93,10 @@
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{
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extern char *optarg;
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extern int optind;
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- int c, sock;
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+ int c;
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char *p, *intf, *filter, ebuf[PCAP_ERRBUF_SIZE];
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+ char libnet_ebuf[LIBNET_ERRBUF_SIZE];
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+ libnet_t *l;
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pcap_t *pd;
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intf = NULL;
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@@ -136,14 +136,14 @@
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if ((pcap_off = pcap_dloff(pd)) < 0)
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errx(1, "couldn't determine link layer offset");
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- if ((sock = libnet_open_raw_sock(IPPROTO_RAW)) == -1)
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+ if ((l = libnet_init(LIBNET_RAW4, intf, libnet_ebuf)) == NULL)
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errx(1, "couldn't initialize sending");
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- libnet_seed_prand();
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+ libnet_seed_prand(l);
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warnx("listening on %s [%s]", intf, filter);
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- pcap_loop(pd, -1, tcp_kill_cb, (u_char *)&sock);
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+ pcap_loop(pd, -1, tcp_kill_cb, (u_char *)l);
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/* NOTREACHED */
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