Nmap Development mailing list archives
get_max_open_descriptors() is more generous than Nsock.
From: "Luis MartinGarcia." <luis.mgarc () gmail com>
Date: Mon, 19 Dec 2011 13:36:11 +0100
Hi, I am using libnetutil::get_max_open_descriptors() to determine the maximum number of TCP connects that I can do in Nping before I start closing old sockets. The thing is that on my Linux box, that function returns 4096. However, when I schedule more than 1024 TCP connect events, nsock fatals: [...] SENT (1.0150s) Starting TCP Handshake > ::1:80 SENT (1.0160s) Starting TCP Handshake > ::1:80 SENT (1.0170s) Starting TCP Handshake > ::1:80 SENT (1.0180s) Starting TCP Handshake > ::1:80 nsock_core.c:186: Attempt to FD_SET fd 1024, which is not less than FD_SETSIZE (1024). Try using a lower parallelism. Has anyone experienced this behavior? Is nsock failing to determine the maximum number of descriptors per process? Is it get_max_open_descriptors()'s fault? Regards, Luis MartinGarcia. PS: Debug output NSOCK (7.8530s) msevent_new (IOD #NULL) (EID #16364) NSOCK (7.8530s) Timer created - 2ms from now. EID 16364 NSOCK (7.8530s) NSE #16364: Adding event NSOCK (7.8530s) nsock_loop() started (timeout=2ms). 3 events pending NSOCK (7.8530s) wait_for_events NSOCK (7.8530s) before iterating, list 0 NSOCK (7.8530s) before iterating, list 1 NSOCK (7.8530s) before iterating, list 2 NSOCK (7.8530s) before iterating, list 3 NSOCK (7.8530s) before iterating 16332 NSOCK (7.8530s) before iterating 16356 NSOCK (7.8530s) before iterating 16364 NSOCK (7.8530s) before iterating, list 4 NSOCK (7.8530s) list 3, iterating 16332 NSOCK (7.8530s) NSE #16332: Removing event from event_lists[3] NSOCK (7.8530s) Callback: TIMER SUCCESS for EID 16332 NSOCK (7.8530s) msevent_new (IOD #1022) (EID #16368) NSOCK (7.8530s) TCP connection requested to ::1:80 (IOD #1022) EID 16368 NSOCK (7.8530s) NSE #16368: Adding event nsock_core.c:186: Attempt to FD_SET fd 1024, which is not less than FD_SETSIZE (1024). Try using a lower parallelism. _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://seclists.org/nmap-dev/
Current thread:
- get_max_open_descriptors() is more generous than Nsock. Luis MartinGarcia. (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Henri Doreau (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Luis MartinGarcia. (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Henri Doreau (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Luis MartinGarcia. (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Henri Doreau (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Luis MartinGarcia. (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Luis MartinGarcia. (Dec 19)
- Re: get_max_open_descriptors() is more generous than Nsock. Henri Doreau (Dec 19)