mirror of
https://git.freebsd.org/ports.git
synced 2025-05-14 00:01:52 -04:00
149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
--- ./dnsspoof.c.orig 2001-03-15 09:33:03.000000000 +0100
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+++ ./dnsspoof.c 2014-07-22 13:20:14.000000000 +0200
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@@ -38,7 +38,7 @@
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pcap_t *pcap_pd = NULL;
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int pcap_off = -1;
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-int lnet_sock = -1;
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+libnet_t *l;
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u_long lnet_ip = -1;
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static void
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@@ -90,19 +90,18 @@
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dns_init(char *dev, char *filename)
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{
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FILE *f;
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- struct libnet_link_int *llif;
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+ libnet_t *l;
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+ char libnet_ebuf[LIBNET_ERRBUF_SIZE];
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struct dnsent *de;
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char *ip, *name, buf[1024];
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- if ((llif = libnet_open_link_interface(dev, buf)) == NULL)
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- errx(1, "%s", buf);
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+ if ((l = libnet_init(LIBNET_LINK, dev, libnet_ebuf)) == NULL)
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+ errx(1, "%s", libnet_ebuf);
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- if ((lnet_ip = libnet_get_ipaddr(llif, dev, buf)) == -1)
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- errx(1, "%s", buf);
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+ if ((lnet_ip = libnet_get_ipaddr4(l)) == -1)
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+ errx(1, "%s", libnet_geterror(l));
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- lnet_ip = htonl(lnet_ip);
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-
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- libnet_close_link_interface(llif);
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+ libnet_destroy(l);
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SLIST_INIT(&dns_entries);
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@@ -180,7 +179,7 @@
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static void
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dns_spoof(u_char *u, const struct pcap_pkthdr *pkthdr, 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_udp_hdr *udp;
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HEADER *dns;
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char name[MAXHOSTNAMELEN];
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@@ -189,7 +188,7 @@
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in_addr_t dst;
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u_short type, class;
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- ip = (struct libnet_ip_hdr *)(pkt + pcap_off);
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+ ip = (struct libnet_ipv4_hdr *)(pkt + pcap_off);
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udp = (struct libnet_udp_hdr *)(pkt + pcap_off + (ip->ip_hl * 4));
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dns = (HEADER *)(udp + 1);
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p = (u_char *)(dns + 1);
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@@ -212,7 +211,7 @@
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if (class != C_IN)
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return;
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- p = buf + IP_H + UDP_H + dnslen;
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+ p = buf + dnslen;
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if (type == T_A) {
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if ((dst = dns_lookup_a(name)) == -1)
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@@ -234,38 +233,38 @@
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anslen += 12;
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}
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else return;
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-
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- libnet_build_ip(UDP_H + dnslen + anslen, 0, libnet_get_prand(PRu16),
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- 0, 64, IPPROTO_UDP, ip->ip_dst.s_addr,
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- ip->ip_src.s_addr, NULL, 0, buf);
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-
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- libnet_build_udp(ntohs(udp->uh_dport), ntohs(udp->uh_sport),
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- NULL, dnslen + anslen, buf + IP_H);
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- memcpy(buf + IP_H + UDP_H, (u_char *)dns, dnslen);
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+ memcpy(buf, (u_char *)dns, dnslen);
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- dns = (HEADER *)(buf + IP_H + UDP_H);
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+ dns = (HEADER *)buf;
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dns->qr = dns->ra = 1;
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if (type == T_PTR) dns->aa = 1;
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dns->ancount = htons(1);
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dnslen += anslen;
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+
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+ libnet_clear_packet(l);
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+ libnet_build_udp(ntohs(udp->uh_dport), ntohs(udp->uh_sport),
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+ LIBNET_UDP_H + dnslen, 0,
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+ (u_int8_t *)buf, dnslen, l, 0);
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+
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+ libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_UDP_H + dnslen, 0,
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+ libnet_get_prand(LIBNET_PRu16), 0, 64, IPPROTO_UDP, 0,
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+ ip->ip_dst.s_addr, ip->ip_src.s_addr, NULL, 0, l, 0);
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- libnet_do_checksum(buf, IPPROTO_UDP, UDP_H + dnslen);
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-
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- if (libnet_write_ip(lnet_sock, buf, IP_H + UDP_H + dnslen) < 0)
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+ if (libnet_write(l) < 0)
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warn("write");
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fprintf(stderr, "%s.%d > %s.%d: %d+ %s? %s\n",
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- libnet_host_lookup(ip->ip_src.s_addr, 0), ntohs(udp->uh_sport),
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- libnet_host_lookup(ip->ip_dst.s_addr, 0), ntohs(udp->uh_dport),
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+ libnet_addr2name4(ip->ip_src.s_addr, 0), ntohs(udp->uh_sport),
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+ libnet_addr2name4(ip->ip_dst.s_addr, 0), ntohs(udp->uh_dport),
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ntohs(dns->id), type == T_A ? "A" : "PTR", name);
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}
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static void
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cleanup(int sig)
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{
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- libnet_close_raw_sock(lnet_sock);
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+ libnet_destroy(l);
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pcap_close(pcap_pd);
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exit(0);
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}
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@@ -276,6 +275,7 @@
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extern char *optarg;
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extern int optind;
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char *p, *dev, *hosts, buf[1024];
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+ char ebuf[LIBNET_ERRBUF_SIZE];
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int i;
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dev = hosts = NULL;
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@@ -306,7 +306,7 @@
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strlcpy(buf, p, sizeof(buf));
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}
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else snprintf(buf, sizeof(buf), "udp dst port 53 and not src %s",
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- libnet_host_lookup(lnet_ip, 0));
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+ libnet_addr2name4(lnet_ip, LIBNET_DONT_RESOLVE));
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if ((pcap_pd = pcap_init(dev, buf, 128)) == NULL)
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errx(1, "couldn't initialize sniffing");
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@@ -314,10 +314,10 @@
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if ((pcap_off = pcap_dloff(pcap_pd)) < 0)
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errx(1, "couldn't determine link layer offset");
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- if ((lnet_sock = libnet_open_raw_sock(IPPROTO_RAW)) == -1)
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+ if ((l = libnet_init(LIBNET_RAW4, dev, 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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signal(SIGHUP, cleanup);
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signal(SIGINT, cleanup);
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