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--- dsniff-2.4.orig/tcpnice.c 2001-03-17 08:41:51.000000000 +0100
+++ dsniff-2.4/tcpnice.c 2009-12-11 13:01:35.000000000 +0100
@@ -41,107 +41,106 @@ usage(void)
}
static void
-send_tcp_window_advertisement(int sock, struct libnet_ip_hdr *ip,
+send_tcp_window_advertisement(libnet_t *l, struct libnet_ipv4_hdr *ip,
struct libnet_tcp_hdr *tcp)
{
int len;
ip->ip_hl = 5;
- ip->ip_len = htons(IP_H + TCP_H);
- ip->ip_id = libnet_get_prand(PRu16);
- memcpy(buf, (u_char *)ip, IP_H);
+ ip->ip_len = htons(LIBNET_IPV4_H + LIBNET_TCP_H);
+ ip->ip_id = libnet_get_prand(LIBNET_PRu16);
+ memcpy(buf, (u_char *)ip, LIBNET_IPV4_H);
tcp->th_off = 5;
tcp->th_win = htons(MIN_WIN);
- memcpy(buf + IP_H, (u_char *)tcp, TCP_H);
+ memcpy(buf + LIBNET_IPV4_H, (u_char *)tcp, LIBNET_TCP_H);
- libnet_do_checksum(buf, IPPROTO_TCP, TCP_H);
+ libnet_do_checksum(l, buf, IPPROTO_TCP, LIBNET_TCP_H);
- len = IP_H + TCP_H;
+ len = LIBNET_IPV4_H + LIBNET_TCP_H;
- if (libnet_write_ip(sock, buf, len) != len)
+ if (libnet_write_raw_ipv4(l, buf, len) != len)
warn("write");
fprintf(stderr, "%s:%d > %s:%d: . ack %lu win %d\n",
- libnet_host_lookup(ip->ip_src.s_addr, 0), ntohs(tcp->th_sport),
- libnet_host_lookup(ip->ip_dst.s_addr, 0), ntohs(tcp->th_dport),
+ libnet_addr2name4(ip->ip_src.s_addr, 0), ntohs(tcp->th_sport),
+ libnet_addr2name4(ip->ip_dst.s_addr, 0), ntohs(tcp->th_dport),
ntohl(tcp->th_ack), 1);
}
static void
-send_icmp_source_quench(int sock, struct libnet_ip_hdr *ip)
+send_icmp_source_quench(libnet_t *l, struct libnet_ipv4_hdr *ip)
{
- struct libnet_icmp_hdr *icmp;
+ struct libnet_icmpv4_hdr *icmp;
int len;
len = (ip->ip_hl * 4) + 8;
- libnet_build_ip(ICMP_ECHO_H + len, 0, libnet_get_prand(PRu16),
- 0, 64, IPPROTO_ICMP, ip->ip_dst.s_addr,
- ip->ip_src.s_addr, NULL, 0, buf);
-
- icmp = (struct libnet_icmp_hdr *)(buf + IP_H);
+ icmp = (struct libnet_icmpv4_hdr *)(buf + LIBNET_IPV4_H);
icmp->icmp_type = ICMP_SOURCEQUENCH;
icmp->icmp_code = 0;
- memcpy((u_char *)icmp + ICMP_ECHO_H, (u_char *)ip, len);
+ memcpy((u_char *)icmp + LIBNET_ICMPV4_ECHO_H, (u_char *)ip, len);
- libnet_do_checksum(buf, IPPROTO_ICMP, ICMP_ECHO_H + len);
+ len += LIBNET_ICMPV4_ECHO_H;
- len += (IP_H + ICMP_ECHO_H);
+ libnet_build_ipv4(LIBNET_IPV4_H + len, 0,
+ libnet_get_prand(LIBNET_PRu16), 0, 64, IPPROTO_ICMP,
+ 0, ip->ip_dst.s_addr, ip->ip_src.s_addr,
+ (u_int8_t *) icmp, len, l, 0);
- if (libnet_write_ip(sock, buf, len) != len)
+ if (libnet_write(l) != len)
warn("write");
fprintf(stderr, "%s > %s: icmp: source quench\n",
- libnet_host_lookup(ip->ip_dst.s_addr, 0),
- libnet_host_lookup(ip->ip_src.s_addr, 0));
+ libnet_addr2name4(ip->ip_dst.s_addr, 0),
+ libnet_addr2name4(ip->ip_src.s_addr, 0));
}
static void
-send_icmp_frag_needed(int sock, struct libnet_ip_hdr *ip)
+send_icmp_frag_needed(libnet_t *l, struct libnet_ipv4_hdr *ip)
{
- struct libnet_icmp_hdr *icmp;
+ struct libnet_icmpv4_hdr *icmp;
int len;
len = (ip->ip_hl * 4) + 8;
- libnet_build_ip(ICMP_MASK_H + len, 4, libnet_get_prand(PRu16),
- 0, 64, IPPROTO_ICMP, ip->ip_dst.s_addr,
- ip->ip_src.s_addr, NULL, 0, buf);
-
- icmp = (struct libnet_icmp_hdr *)(buf + IP_H);
+ icmp = (struct libnet_icmpv4_hdr *)(buf + LIBNET_IPV4_H);
icmp->icmp_type = ICMP_UNREACH;
icmp->icmp_code = ICMP_UNREACH_NEEDFRAG;
icmp->hun.frag.pad = 0;
icmp->hun.frag.mtu = htons(MIN_MTU);
- memcpy((u_char *)icmp + ICMP_MASK_H, (u_char *)ip, len);
+ memcpy((u_char *)icmp + LIBNET_ICMPV4_MASK_H, (u_char *)ip, len);
- libnet_do_checksum(buf, IPPROTO_ICMP, ICMP_MASK_H + len);
-
- len += (IP_H + ICMP_MASK_H);
+ len += LIBNET_ICMPV4_MASK_H;
+
+ libnet_build_ipv4(LIBNET_IPV4_H + len, 4,
+ libnet_get_prand(LIBNET_PRu16), 0, 64, IPPROTO_ICMP,
+ 0, ip->ip_dst.s_addr, ip->ip_src.s_addr,
+ (u_int8_t *) icmp, len, l, 0);
- if (libnet_write_ip(sock, buf, len) != len)
+ if (libnet_write(l) != len)
warn("write");
fprintf(stderr, "%s > %s: icmp: ",
- libnet_host_lookup(ip->ip_dst.s_addr, 0),
- libnet_host_lookup(ip->ip_src.s_addr, 0));
+ libnet_addr2name4(ip->ip_dst.s_addr, 0),
+ libnet_addr2name4(ip->ip_src.s_addr, 0));
fprintf(stderr, "%s unreachable - need to frag (mtu %d)\n",
- libnet_host_lookup(ip->ip_src.s_addr, 0), MIN_MTU);
+ libnet_addr2name4(ip->ip_src.s_addr, 0), MIN_MTU);
}
static void
tcp_nice_cb(u_char *user, const struct pcap_pkthdr *pcap, const u_char *pkt)
{
- struct libnet_ip_hdr *ip;
+ struct libnet_ipv4_hdr *ip;
struct libnet_tcp_hdr *tcp;
- int *sock, len;
+ int len;
+ libnet_t *l;
- sock = (int *)user;
+ l = (libnet_t *)user;
pkt += pcap_off;
len = pcap->caplen - pcap_off;
- ip = (struct libnet_ip_hdr *)pkt;
+ ip = (struct libnet_ipv4_hdr *)pkt;
if (ip->ip_p != IPPROTO_TCP)
return;
@@ -151,11 +150,11 @@ tcp_nice_cb(u_char *user, const struct p
if (ntohs(ip->ip_len) > (ip->ip_hl << 2) + (tcp->th_off << 2)) {
if (Opt_icmp)
- send_icmp_source_quench(*sock, ip);
+ send_icmp_source_quench(l, ip);
if (Opt_win)
- send_tcp_window_advertisement(*sock, ip, tcp);
+ send_tcp_window_advertisement(l, ip, tcp);
if (Opt_pmtu)
- send_icmp_frag_needed(*sock, ip);
+ send_icmp_frag_needed(l, ip);
}
}
@@ -164,8 +163,10 @@ main(int argc, char *argv[])
{
extern char *optarg;
extern int optind;
- int c, sock;
+ int c;
char *intf, *filter, ebuf[PCAP_ERRBUF_SIZE];
+ char libnet_ebuf[LIBNET_ERRBUF_SIZE];
+ libnet_t *l;
pcap_t *pd;
intf = NULL;
@@ -209,14 +210,14 @@ main(int argc, char *argv[])
if ((pcap_off = pcap_dloff(pd)) < 0)
errx(1, "couldn't determine link layer offset");
- if ((sock = libnet_open_raw_sock(IPPROTO_RAW)) == -1)
+ if ((l = libnet_init(LIBNET_RAW4, intf, libnet_ebuf)) == NULL)
errx(1, "couldn't initialize sending");
- libnet_seed_prand();
+ libnet_seed_prand(l);
warnx("listening on %s [%s]", intf, filter);
- pcap_loop(pd, -1, tcp_nice_cb, (u_char *)&sock);
+ pcap_loop(pd, -1, tcp_nice_cb, (u_char *)l);
/* NOTREACHED */
|
