dcf6de552
Denis Vlasenko
2007-06-19
Subject
pscan: size optimization (Tito
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Commit Diff GitHub →
networking/pscan.c+3 -5
| @@ -35,13 +35,13 @@ int pscan_main(int argc, char **argv) | |
| { | |
| const char *opt_max_port = "1024"; /* -P: default max 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 | |
| * totally blocked. min rtt of 5 ms may be too low if you are | |
| * scanning an Internet host behind saturated/traffic shaped link. | |
| * Rule of thumb: with min_rtt of N msec, scanning 1000 ports | |
| * 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; | |
| int s; | |
| 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); | |
| argv += optind; | |
| 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; | |
| - | if ((int)nports <= 0) |
| - | bb_show_usage(); |
| 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; | |