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Fix build_icmp_raw and build_igmp_raw filling the packet data payload with

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zeroes instead of the supplied random data, when nmap is invoked with --data-length.
This commit is contained in:
shinnok
2011-06-18 11:20:54 +00:00
parent 90153308cb
commit e8bd001619
1 changed files with 7 additions and 5 deletions
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12
tcpip.cc
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@@ -613,7 +613,7 @@ u8 *build_ip_raw(const struct in_addr *source,
tos, ipid, df ? IP_DF : 0, myttl, proto, source, victim);
/* We should probably copy the data over too */
if (data)
if (data && datalen)
memcpy((u8 *) ip + sizeof(struct ip) + ipoptlen, data, datalen);
*outpacketlen = packetlen;
@@ -1030,9 +1030,10 @@ u8 *build_icmp_raw(const struct in_addr *source,
fatal("Unknown icmp type/code (%d/%d) in %s", ptype, pcode, __func__);
}
if (datalen > 0) {
/* Copy the data over too */
if (data && datalen) {
icmplen += MIN(dlen, datalen);
memset(datastart, 0, MIN(dlen, datalen));
memcpy(datastart, data, MIN(dlen, datalen));
}
/* Fill out the ping packet. All the ICMP types handled by this function have
@@ -1138,9 +1139,10 @@ u8 *build_igmp_raw(const struct in_addr *source,
fatal("Unknown igmp type (%d) in %s", ptype, __func__);
}
if (datalen > 0) {
/* Copy the data over too */
if (data && datalen) {
igmplen += MIN(dlen, datalen);
memset(datastart, 0, MIN(dlen, datalen));
memcpy(datastart, data, MIN(dlen, datalen));
}
igmp.igmp_cksum = 0;