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fast caseless comparison of proto names

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This commit is contained in:
dmiller
2022-09-16 01:10:18 +00:00
parent f7ff89b744
commit 721912c113
1 changed files with 23 additions and 13 deletions
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36
services.cc
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@@ -205,21 +205,31 @@ static int nmap_services_init() {
continue;
}
if (strncasecmp(proto, "tcp", 3) == 0) {
// caseless comparison of first 4 bytes
u32 protocmp = (*(u32 *)proto) & ~0x20202020;
if (protocmp == *(u32 *)"TCP") {
numtcpports++;
} else if (strncasecmp(proto, "udp", 3) == 0) {
numudpports++;
} else if (strncasecmp(proto, "sctp", 4) == 0) {
}
else if (protocmp == *(u32 *)"UDP") {
numudpports++;
}
else if (protocmp == *(u32 *)"SCTP" && proto[4] == '\0') {
numsctpports++;
} else if (strncasecmp(proto, "ddp", 3) == 0) {
/* ddp is some apple thing...we don't "do" that */
} else if (strncasecmp(proto, "divert", 6) == 0) {
/* divert sockets are for freebsd's natd */
} else if (strncasecmp(proto, "#", 1) == 0) {
/* possibly misplaced comment, but who cares? */
} else {
if (o.debugging)
error("Unknown protocol (%s) on line %d of services file %s.", proto, lineno, filename);
}
else {
if (o.debugging) {
// ignore a few known protos from system services files
if (strncasecmp(proto, "ddp", 3) == 0 ||
/* ddp is some apple thing...we don't "do" that */
strncasecmp(proto, "divert", 6) == 0 ||
/* divert sockets are for freebsd's natd */
strncasecmp(proto, "#", 1) == 0) {
/* possibly misplaced comment, but who cares? */
} else {
error("protocmp = %u, tcp = %u", protocmp, *(u32 *)"TCP");
fatal("Unknown protocol (%s) on line %d of services file %s.", proto, lineno, filename);
}
}
continue;
}