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Allow doing --data-length 0. That's the documented way to turn off UDP

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payloads.
This commit is contained in:
david
2009-08-19 17:52:23 +00:00
parent ab09f1974f
commit fec2cc40d0
2 changed files with 5 additions and 6 deletions
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4
nmap.cc
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@@ -899,11 +899,11 @@ int nmap_main(int argc, char *argv[]) {
o.debugging++; o.debugging++;
} else if (optcmp(long_options[option_index].name, "data-length") == 0) { } else if (optcmp(long_options[option_index].name, "data-length") == 0) {
o.extra_payload_length = (int)strtol(optarg, NULL, 10); o.extra_payload_length = (int)strtol(optarg, NULL, 10);
if (o.extra_payload_length < 1 || o.extra_payload_length > MAX_PAYLOAD_ALLOWED) if (o.extra_payload_length < 0 || o.extra_payload_length > MAX_PAYLOAD_ALLOWED)
fatal("data-length must be between 0 and %d", MAX_PAYLOAD_ALLOWED); fatal("data-length must be between 0 and %d", MAX_PAYLOAD_ALLOWED);
if (o.extra_payload_length > 1400 ) /* 1500 - IP with opts - TCP with opts. */ if (o.extra_payload_length > 1400 ) /* 1500 - IP with opts - TCP with opts. */
error("WARNING: Payloads bigger than 1400 bytes may not be sent successfully."); error("WARNING: Payloads bigger than 1400 bytes may not be sent successfully.");
o.extra_payload = (char *) safe_malloc(o.extra_payload_length); o.extra_payload = (char *) safe_malloc(MIN(o.extra_payload_length, 1));
get_random_bytes(o.extra_payload, o.extra_payload_length); get_random_bytes(o.extra_payload, o.extra_payload_length);
} else if (optcmp(long_options[option_index].name, "send-eth") == 0) { } else if (optcmp(long_options[option_index].name, "send-eth") == 0) {
o.sendpref = PACKET_SEND_ETH_STRONG; o.sendpref = PACKET_SEND_ETH_STRONG;

7
payload.cc
View File

@@ -227,15 +227,14 @@ static const char payload_null[] = "";
length is returned through the length pointer. */ length is returned through the length pointer. */
const char *get_udp_payload(u16 dport, size_t *length) { const char *get_udp_payload(u16 dport, size_t *length) {
if (o.extra_payload_length > 0) { if (o.extra_payload != NULL) {
*length = o.extra_payload_length; *length = o.extra_payload_length;
return o.extra_payload; return o.extra_payload;
} } else {
else
return udp_port2payload(dport, length); return udp_port2payload(dport, length);
}
} }
/* Get a payload appropriate for the given UDP port. For certain selected ports /* Get a payload appropriate for the given UDP port. For certain selected ports
a payload is returned, and for others a zero-length payload is returned. The a payload is returned, and for others a zero-length payload is returned. The
length is returned through the length pointer. */ length is returned through the length pointer. */