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pscan: size optimization (Tito <farmatito@tiscali.it>)

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This commit is contained in:
Denis Vlasenko 2007-06-19 16:57:47 +00:00
parent 5b5bcf24f5
commit dcf6de552a
1 changed files with 3 additions and 5 deletions
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8
networking/pscan.c
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@ -35,13 +35,13 @@ int pscan_main(int argc, char **argv)
{ {
const char *opt_max_port = "1024"; /* -P: default max port */ const char *opt_max_port = "1024"; /* -P: default max port */
const char *opt_min_port = "1"; /* -p: default min port */ const char *opt_min_port = "1"; /* -p: default min port */
const char *opt_timeout = "5000"; /* -t: default timeout */ const char *opt_timeout = "5000"; /* -t: default timeout in msec */
/* We estimate rtt and wait rtt*4 before concluding that port is /* We estimate rtt and wait rtt*4 before concluding that port is
* totally blocked. min rtt of 5 ms may be too low if you are * totally blocked. min rtt of 5 ms may be too low if you are
* scanning an Internet host behind saturated/traffic shaped link. * scanning an Internet host behind saturated/traffic shaped link.
* Rule of thumb: with min_rtt of N msec, scanning 1000 ports * Rule of thumb: with min_rtt of N msec, scanning 1000 ports
* will take N seconds at absolute minimum */ * will take N seconds at absolute minimum */
const char *opt_min_rtt = "5"; /* -T: default min rtt */ const char *opt_min_rtt = "5"; /* -T: default min rtt in msec */
len_and_sockaddr *lsap; len_and_sockaddr *lsap;
int s; int s;
unsigned port, max_port, nports; unsigned port, max_port, nports;
@ -57,10 +57,8 @@ int pscan_main(int argc, char **argv)
getopt32(argc, argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt); getopt32(argc, argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt);
argv += optind; argv += optind;
max_port = xatou_range(opt_max_port, 1, 65535); max_port = xatou_range(opt_max_port, 1, 65535);
port = xatou_range(opt_min_port, 1, 65535); port = xatou_range(opt_min_port, 1, max_port);
nports = max_port - port + 1; nports = max_port - port + 1;
if ((int)nports <= 0)
bb_show_usage();
rtt_4 = timeout = xatou_range(opt_timeout, 1, INT_MAX/1000 / 4) * 1000; rtt_4 = timeout = xatou_range(opt_timeout, 1, INT_MAX/1000 / 4) * 1000;
min_rtt = xatou_range(opt_min_rtt, 1, INT_MAX/1000 / 4) * 1000; min_rtt = xatou_range(opt_min_rtt, 1, INT_MAX/1000 / 4) * 1000;