Nmap Development mailing list archives
Nmap doesn't register signal handlers
From: ithilgore <ithilgore.ryu.l () gmail com>
Date: Wed, 12 Aug 2009 00:52:21 +0300
Hello. While experimenting with signal handlers in Ncrack, I noticed that Nmap never registers the sigdie() handler. This is caused, because there is no check in the configure.ac for the signal function, and thus HAVE_SIGNAL stays always undefined. You can see that the signal handler doesn't work, because no message is printed whenever you press Ctrl+C to stop Nmap from continuing. Normally, something like "caught SIGNAL <signame>, cleaning up" should be printed, according to sigdie(): void sigdie(int signo) { int abt = 0; fflush(stdout); switch(signo) { case SIGINT: error("caught SIGINT signal, cleaning up"); break; #ifdef SIGTERM case SIGTERM: error("caught SIGTERM signal, cleaning up"); break; #endif #ifdef SIGHUP case SIGHUP: error("caught SIGHUP signal, cleaning up"); break; #endif #ifdef SIGSEGV case SIGSEGV: error("caught SIGSEGV signal, cleaning up"); abt = 1; break; #endif #ifdef SIGBUS case SIGBUS: error("caught SIGBUS signal, cleaning up"); abt = 1; break; #endif default: error("caught signal %d, cleaning up", signo); abt = 1; break; } fflush(stderr); log_close(LOG_MACHINE|LOG_NORMAL|LOG_SKID); if (abt) abort(); exit(1); } In Ncrack I just added this line in its configure.ac : AC_CHECK_FUNCS(signal) and added #undef HAVE_SIGNAL at ncrack_config.h.in The equivalent works for Nmap. Let me know if there was another reason that you may have deliberately chosen not to compile in signal support (e.g for debugging reasons) so that I can commit the changes to Nmap's svn repository, if needed. Regards, ithilgore _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- Nmap doesn't register signal handlers ithilgore (Aug 11)
- Re: Nmap doesn't register signal handlers Luis M. (Aug 12)
- Re: Nmap doesn't register signal handlers Solar Designer (Aug 12)
- Re: Nmap doesn't register signal handlers doug (Aug 12)
- Re: Nmap doesn't register signal handlers Fyodor (Aug 13)