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https://github.com/nmap/nmap.git
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Factor out build_protoscan_packet.
This removes some inline complexity from sendIPScanProbe.
This commit is contained in:
david
269
scan_engine.cc
269
scan_engine.cc
@@ -3163,6 +3163,148 @@ static UltraProbe *sendArpScanProbe(UltraScanInfo *USI, HostScanStats *hss,
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return probe;
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}
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/* Build an appropriate protocol scan (-sO) probe for the given source and
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destination addresses and protocol. src and dst must be of the same address
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family. Returns NULL on error. */
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static u8 *build_protoscan_packet(const struct sockaddr_storage *src,
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const struct sockaddr_storage *dst, u8 proto, u16 sport, u32 *packetlen)
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{
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u16 icmp_ident, ipid;
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u8 *packet;
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packet = NULL;
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*packetlen = 0;
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ipid = get_random_u16();
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/* Some hosts do not respond to ICMP requests if the identifier is 0. */
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icmp_ident = (get_random_u16() % 0xffff) + 1;
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assert(src->ss_family == dst->ss_family);
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if (src->ss_family == AF_INET) {
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const struct sockaddr_in *src_in, *dst_in;
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src_in = (struct sockaddr_in *) src;
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dst_in = (struct sockaddr_in *) dst;
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switch (proto) {
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case IPPROTO_TCP:
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packet = build_tcp_raw(&src_in->sin_addr, &dst_in->sin_addr,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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get_random_u32(), get_random_u32(), 0, TH_ACK, 0, 0,
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NULL,0,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_ICMP:
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packet = build_icmp_raw(&src_in->sin_addr, &dst_in->sin_addr,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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0, icmp_ident, 8, 0,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_IGMP:
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packet = build_igmp_raw(&src_in->sin_addr, &dst_in->sin_addr,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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0x11, 0,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_UDP:
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packet = build_udp_raw(&src_in->sin_addr, &dst_in->sin_addr,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_SCTP:
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{
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struct sctp_chunkhdr_init chunk;
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sctp_pack_chunkhdr_init(&chunk, SCTP_INIT, 0,
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sizeof(struct sctp_chunkhdr_init),
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get_random_u32()/*itag*/,
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32768, 10, 2048,
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get_random_u32()/*itsn*/);
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packet = build_sctp_raw(&src_in->sin_addr, &dst_in->sin_addr,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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0UL, (char*)&chunk,
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sizeof(struct sctp_chunkhdr_init),
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o.extra_payload, o.extra_payload_length,
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packetlen);
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}
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break;
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default:
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packet = build_ip_raw(&src_in->sin_addr, &dst_in->sin_addr,
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proto,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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}
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} else if (src->ss_family == AF_INET6) {
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const struct sockaddr_in6 *src_in6, *dst_in6;
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src_in6 = (struct sockaddr_in6 *) src;
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dst_in6 = (struct sockaddr_in6 *) dst;
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switch (proto) {
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case IPPROTO_TCP:
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packet = build_tcp_raw_ipv6(&src_in6->sin6_addr, &dst_in6->sin6_addr,
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0, ipid, o.ttl, sport, o.magic_port,
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get_random_u32(), get_random_u32(), 0,
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TH_ACK, 0, 0, NULL, 0, o.extra_payload,
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o.extra_payload_length, packetlen);
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break;
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case IPPROTO_ICMPV6:
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packet = build_icmpv6_raw(&src_in6->sin6_addr, &dst_in6->sin6_addr,
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0, ipid, o.ttl, 0, icmp_ident,
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ICMPV6_ECHO, ICMPV6_ECHOREPLY,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_UDP:
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packet = build_udp_raw_ipv6(&src_in6->sin6_addr, &dst_in6->sin6_addr,
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0, ipid, o.ttl, sport, o.magic_port,
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o.extra_payload, o.extra_payload_length,
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packetlen);
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break;
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case IPPROTO_SCTP:
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{
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struct sctp_chunkhdr_init chunk;
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sctp_pack_chunkhdr_init(&chunk, SCTP_INIT, 0,
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sizeof(struct sctp_chunkhdr_init),
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get_random_u32()/*itag*/,
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32768, 10, 2048,
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get_random_u32()/*itsn*/);
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packet = build_sctp_raw_ipv6(&src_in6->sin6_addr, &dst_in6->sin6_addr,
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0, ipid, o.ttl, sport, o.magic_port,
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0UL, (char*)&chunk,
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sizeof(struct sctp_chunkhdr_init),
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o.extra_payload, o.extra_payload_length,
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packetlen);
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}
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break;
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default:
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packet = build_ipv6_raw(&src_in6->sin6_addr, &dst_in6->sin6_addr,
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0, ipid, proto, o.ttl, o.extra_payload,
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o.extra_payload_length, packetlen);
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break;
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}
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}
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return packet;
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}
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/* If this is NOT a ping probe, set pingseq to 0. Otherwise it will be the
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ping sequence number (they start at 1). The probe sent is returned.
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@@ -3362,71 +3504,17 @@ static UltraProbe *sendIPScanProbe(UltraScanInfo *USI, HostScanStats *hss,
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free(chunk);
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} else if (pspec->type == PS_PROTO) {
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if (hss->target->af() == AF_INET) {
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struct sockaddr_storage ss;
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *) &ss;
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sin->sin_family = AF_INET;
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for(decoy = 0; decoy < o.numdecoys; decoy++) {
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switch(pspec->proto) {
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case IPPROTO_TCP:
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packet = build_tcp_raw(&o.decoys[decoy], hss->target->v4hostip(),
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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get_random_u32(), get_random_u32(), 0, TH_ACK, 0, 0,
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NULL,0,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_ICMP:
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packet = build_icmp_raw(&o.decoys[decoy], hss->target->v4hostip(),
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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0, icmp_ident, 8, 0,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_IGMP:
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packet = build_igmp_raw(&o.decoys[decoy], hss->target->v4hostip(),
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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0x11, 0,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_UDP:
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packet = build_udp_raw(&o.decoys[decoy], hss->target->v4hostip(),
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_SCTP:
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{
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struct sctp_chunkhdr_init chunk;
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sctp_pack_chunkhdr_init(&chunk, SCTP_INIT, 0,
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sizeof(struct sctp_chunkhdr_init),
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get_random_u32()/*itag*/,
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32768, 10, 2048,
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get_random_u32()/*itsn*/);
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packet = build_sctp_raw(&o.decoys[decoy], hss->target->v4hostip(),
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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sport, o.magic_port,
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0UL, (char*)&chunk,
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sizeof(struct sctp_chunkhdr_init),
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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}
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break;
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default:
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packet = build_ip_raw(&o.decoys[decoy], hss->target->v4hostip(),
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pspec->proto,
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o.ttl, ipid, IP_TOS_DEFAULT, false,
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o.ipoptions, o.ipoptionslen,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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}
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sin->sin_addr = o.decoys[decoy];
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packet = build_protoscan_packet(&ss, hss->target->TargetSockAddr(),
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pspec->proto, sport, &packetlen);
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assert(packet != NULL);
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if (decoy == o.decoyturn) {
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probe->setIP(packet, packetlen, pspec);
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probe->sent = USI->now;
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@@ -3436,56 +3524,9 @@ static UltraProbe *sendIPScanProbe(UltraScanInfo *USI, HostScanStats *hss,
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free(packet);
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}
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} else if (hss->target->af() == AF_INET6) {
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struct sockaddr_storage source;
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struct sockaddr_in6 *sin6;
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size_t source_len;
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source_len = sizeof(source);
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hss->target->SourceSockAddr(&source, &source_len);
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sin6 = (struct sockaddr_in6 *) &source;
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switch(pspec->proto) {
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case IPPROTO_TCP:
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packet = build_tcp_raw_ipv6(&sin6->sin6_addr, hss->target->v6hostip(),
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0, ipid, o.ttl, sport, o.magic_port,
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get_random_u32(), get_random_u32(), 0,
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TH_ACK, 0, 0, NULL, 0, o.extra_payload,
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o.extra_payload_length, &packetlen);
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break;
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case IPPROTO_ICMPV6:
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packet = build_icmpv6_raw(&sin6->sin6_addr, hss->target->v6hostip(),
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0, ipid, o.ttl, 0, icmp_ident,
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ICMPV6_ECHO, ICMPV6_ECHOREPLY,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_UDP:
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packet = build_udp_raw_ipv6(&sin6->sin6_addr, hss->target->v6hostip(),
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0, ipid, o.ttl, sport, o.magic_port,
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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break;
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case IPPROTO_SCTP:
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{
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struct sctp_chunkhdr_init chunk;
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sctp_pack_chunkhdr_init(&chunk, SCTP_INIT, 0,
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sizeof(struct sctp_chunkhdr_init),
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get_random_u32()/*itag*/,
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32768, 10, 2048,
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get_random_u32()/*itsn*/);
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packet = build_sctp_raw_ipv6(&sin6->sin6_addr, hss->target->v6hostip(),
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0, ipid, o.ttl, sport, o.magic_port,
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0UL, (char*)&chunk,
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sizeof(struct sctp_chunkhdr_init),
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o.extra_payload, o.extra_payload_length,
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&packetlen);
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}
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break;
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default:
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packet = build_ipv6_raw(&sin6->sin6_addr, hss->target->v6hostip(),
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0, ipid, pspec->proto, o.ttl, o.extra_payload,
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o.extra_payload_length, &packetlen);
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break;
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}
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packet = build_protoscan_packet(hss->target->SourceSockAddr(), hss->target->TargetSockAddr(),
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pspec->proto, sport, &packetlen);
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assert(packet != NULL);
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probe->setIP(packet, packetlen, pspec);
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probe->sent = USI->now;
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hss->probeSent(packetlen);
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