From b57613e8d8b7725a7c487c5d69c30a494202d1d9 Mon Sep 17 00:00:00 2001 From: Miek Gieben Date: Mon, 3 Jan 2011 12:30:19 +0100 Subject: [PATCH] Fix the examples so that they work with a nonresponding nameserver Added some error checking --- _examples/chaos/chaos.go | 10 ++++++++++ _examples/mx/_go_.6 | Bin 24576 -> 25735 bytes _examples/mx/mx.go | 21 ++++++++++++--------- 3 files changed, 22 insertions(+), 9 deletions(-) diff --git a/_examples/chaos/chaos.go b/_examples/chaos/chaos.go index 8f00b3c4..5e3d1f51 100644 --- a/_examples/chaos/chaos.go +++ b/_examples/chaos/chaos.go @@ -58,6 +58,11 @@ func addresses(qr chan resolver.DnsMsg, name string) []net.IP { qr <- resolver.DnsMsg{m, nil} in := <-qr + if in.Dns == nil { + fmt.Printf("Nothing recevied: %s\n", in.Error.String()) + return nil + } + if in.Dns.Rcode != dns.RcodeSuccess { return nil } @@ -69,6 +74,11 @@ func addresses(qr chan resolver.DnsMsg, name string) []net.IP { qr <- resolver.DnsMsg{m, nil} in = <-qr + if in.Dns == nil { + fmt.Printf("Nothing recevied: %s\n", in.Error.String()) + return nil + } + if in.Dns.Rcode != dns.RcodeSuccess { return nil } diff --git a/_examples/mx/_go_.6 b/_examples/mx/_go_.6 index b4c3fc57f8e6ecacfb347f63bc41c135530c5e07..6117f940336f31f660c134660097a5ed7f801c87 100644 GIT binary patch literal 25735 zcmc&-ZERi1S-!{djc=R}+qt>6^XVJMNo>b<>~!m<)&59nQg#Jxcf+devb$_dayPLW z+d2N&%?gSrS|p^FO}*6$RszvNg&HYRDz`Y?*=dijEG@5&_xDdswA<&; zn;6t=`zox_zvsoR)$8r?@i|_#C#U-NytK5=>*dwu%^Pd0owwg=Z!NEGUJNx^!kQ-g z_8OFGZ@zM;vq7xC|78EGwO6u7&)4+l*4j$P{aRV>eD0?Ed2@NQ__20lb;JF9p>ua> z<<9L+ak+B0XhqX%7i(FK|0EJk=9U2MCQ^SF|F#Tw71lc&YqwwOtgBXEQftjMZY1!F zE1RmmC*T)r^Spq}JS!;T?;hGZN8%=@YX4N*hZ@^i-c!E?6}Q%F`*B@=4FB26?xFUs z^{v&-<(1CdYUgFP?hUQM>xV8(wWndvd9U)-LigI3B-OTe<-HFw38l*SvcXqt8+E9& zPHDR(Z3hVtvIA(54Zbl7is~D?U#;EiEA@p=YgTEfkJ>g$<cnmFU79kT3T(FL|$Iq_|(Qt>$UmDAXMA4fr!cXqV2{e zV|;Vv&I|MN^9wX^-^S+p^6JgG@r4T?nVZM|7RGC{wE^_sTx;yjn|W>DU3WdQ)=Ne9 z=5@Ldj$ozwAb-md`>Vu1yYRdd51Uw&lAf9}}DPxAsE89)MkeElZVG#?bF 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zVmp<)MIk-_7?X!BKGI{p$UBFz^eK;^y_GEp1m5#b1vpCe&!+)4VC_z2D6-Pznw+TD zA&!ONr36`m4NWQT#To$e+GfeFXQXg^n|CVCmWnCBd)}!4uidF&Z`1Bn;)m@`uF3gA zWXloS5?&6FE!gW6Bi@p8nuAi z;ibpf1Mu3N2#0#$=4tN`Y|8SBnw;2&qnMRXK1i=&S{*)lAdh3OmLES2c?iI)9x8eyWui6KV^bH6bO4#XhU{G$8i4DHI=) z^&RJDciALrgnd(Oy`z!eH${&@g??;%0;smawx@0NpR}$jhg$t7;o8-$YAft$s?}$C Iu8M#E3v{@Z+5i9m diff --git a/_examples/mx/mx.go b/_examples/mx/mx.go index 7e41c900..d296e962 100644 --- a/_examples/mx/mx.go +++ b/_examples/mx/mx.go @@ -17,7 +17,7 @@ func main() { r.Attempts = 1 if len(os.Args) != 2 { - fmt.Printf("%s DOMAIN\n", os.Args[0]) + fmt.Printf("%s DOMAIN\nIt using 127.0.0.1 as a nameserver\n", os.Args[0]) os.Exit(1) } @@ -28,14 +28,17 @@ func main() { qr <- resolver.DnsMsg{m, nil} in := <-qr - - if in.Dns.Rcode != dns.RcodeSuccess { - fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1]) - os.Exit(1) - } - // Stuff must be in the answer section - for _, a := range in.Dns.Answer { - fmt.Printf("%v\n", a) + if in.Dns != nil { + if in.Dns.Rcode != dns.RcodeSuccess { + fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1]) + os.Exit(1) + } + // Stuff must be in the answer section + for _, a := range in.Dns.Answer { + fmt.Printf("%v\n", a) + } + } else { + fmt.Printf("*** error: %s\n", in.Error.String()) } // Stop the resolver, send it a null mesg