diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-06-19 16:57:47 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-06-19 16:57:47 +0000 |
| commit | dcf6de552a15c1e7bddb32f1028ceb6214915425 (patch) | |
| tree | 01099725f37568f9f6a8b846cd2cba17c98cbd88 /networking/pscan.c | |
| parent | 5b5bcf24f5293f7f3db0aca9af98777a5aff6be2 (diff) | |
| download | busybox-w32-dcf6de552a15c1e7bddb32f1028ceb6214915425.tar.gz busybox-w32-dcf6de552a15c1e7bddb32f1028ceb6214915425.tar.bz2 busybox-w32-dcf6de552a15c1e7bddb32f1028ceb6214915425.zip | |
pscan: size optimization (Tito <farmatito@tiscali.it>)
Diffstat (limited to 'networking/pscan.c')
| -rw-r--r-- | networking/pscan.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/networking/pscan.c b/networking/pscan.c index 9fa6993e8..fe146b8bd 100644 --- a/networking/pscan.c +++ b/networking/pscan.c | |||
| @@ -35,13 +35,13 @@ int pscan_main(int argc, char **argv) | |||
| 35 | { | 35 | { |
| 36 | const char *opt_max_port = "1024"; /* -P: default max port */ | 36 | const char *opt_max_port = "1024"; /* -P: default max port */ |
| 37 | const char *opt_min_port = "1"; /* -p: default min port */ | 37 | const char *opt_min_port = "1"; /* -p: default min port */ |
| 38 | const char *opt_timeout = "5000"; /* -t: default timeout */ | 38 | const char *opt_timeout = "5000"; /* -t: default timeout in msec */ |
| 39 | /* We estimate rtt and wait rtt*4 before concluding that port is | 39 | /* We estimate rtt and wait rtt*4 before concluding that port is |
| 40 | * totally blocked. min rtt of 5 ms may be too low if you are | 40 | * totally blocked. min rtt of 5 ms may be too low if you are |
| 41 | * scanning an Internet host behind saturated/traffic shaped link. | 41 | * scanning an Internet host behind saturated/traffic shaped link. |
| 42 | * Rule of thumb: with min_rtt of N msec, scanning 1000 ports | 42 | * Rule of thumb: with min_rtt of N msec, scanning 1000 ports |
| 43 | * will take N seconds at absolute minimum */ | 43 | * will take N seconds at absolute minimum */ |
| 44 | const char *opt_min_rtt = "5"; /* -T: default min rtt */ | 44 | const char *opt_min_rtt = "5"; /* -T: default min rtt in msec */ |
| 45 | len_and_sockaddr *lsap; | 45 | len_and_sockaddr *lsap; |
| 46 | int s; | 46 | int s; |
| 47 | unsigned port, max_port, nports; | 47 | unsigned port, max_port, nports; |
| @@ -57,10 +57,8 @@ int pscan_main(int argc, char **argv) | |||
| 57 | getopt32(argc, argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt); | 57 | getopt32(argc, argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt); |
| 58 | argv += optind; | 58 | argv += optind; |
| 59 | max_port = xatou_range(opt_max_port, 1, 65535); | 59 | max_port = xatou_range(opt_max_port, 1, 65535); |
| 60 | port = xatou_range(opt_min_port, 1, 65535); | 60 | port = xatou_range(opt_min_port, 1, max_port); |
| 61 | nports = max_port - port + 1; | 61 | nports = max_port - port + 1; |
| 62 | if ((int)nports <= 0) | ||
| 63 | bb_show_usage(); | ||
| 64 | rtt_4 = timeout = xatou_range(opt_timeout, 1, INT_MAX/1000 / 4) * 1000; | 62 | rtt_4 = timeout = xatou_range(opt_timeout, 1, INT_MAX/1000 / 4) * 1000; |
| 65 | min_rtt = xatou_range(opt_min_rtt, 1, INT_MAX/1000 / 4) * 1000; | 63 | min_rtt = xatou_range(opt_min_rtt, 1, INT_MAX/1000 / 4) * 1000; |
| 66 | 64 | ||