Patch to improve error messages

[Richard Moore <rich () westpoint ltd uk>]

When strange errnos are received during connect scans, nmap
currently just displays it's own message and the errno of the
system message. This patch makes it display the string version
of the system message too, like this:

Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2005-02-09 14:44 GMT
Strange SO_ERROR from connection to 192.168.4.1 (101 - 'Network is 
unreachable') -- bailing scan : Operation now in progress

The patch is against nmap 3.81.

Cheers

Rich.
--
Richard Moore, Principle Software Engineer,
Westpoint Ltd,
Albion Wharf, 19 Albion Street, Manchester, M1 5LN, England
Tel: +44 161 237 1028
Fax: +44 161 237 1031

*** scan_engine.cc      2005-02-05 07:51:37.000000000 +0000
--- ../xx/nmap-3.81/scan_engine.cc      2005-02-09 14:38:29.000000000 +0000
***************
*** 2176,2186 ****
        case ENETUNREACH:
        case ENETRESET:
        case ECONNABORTED:
!         snprintf(buf, sizeof(buf), "Strange SO_ERROR from connection to %s (%d) -- bailing scan", 
host->target->targetipstr(), optval);
          pfatal(buf);
          break;
        default:
!         snprintf(buf, sizeof(buf), "Strange read error from %s (%d)", host->target->targetipstr(), optval);
          perror(buf);
          break;
        }
--- 2176,2186 ----
        case ENETUNREACH:
        case ENETRESET:
        case ECONNABORTED:
!         snprintf(buf, sizeof(buf), "Strange SO_ERROR from connection to %s (%d - '%s') -- bailing scan", 
host->target->targetipstr(), optval, strerror(optval) );
          pfatal(buf);
          break;
        default:
!         snprintf(buf, sizeof(buf), "Strange read error from %s (%d - '%s')", host->target->targetipstr(), optval, 
strerror(optval));
          perror(buf);
          break;
        }

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