X-Git-Url: http://www.lcore.org/git/lcore.git/blobdiff_plain/096e05689a95dc55ef9f554978c5ea3f263bc919..c1c7500bc32248d67b6cf7903a6db7b15e2cd1c9:/dnssync.pas
diff --git a/dnssync.pas b/dnssync.pas
index 9a0c2c1..f6b0281 100644
--- a/dnssync.pas
+++ b/dnssync.pas
@@ -58,10 +58,6 @@ const
toport='53';
-var
- id:integer;
-
- sendquerytime:array[0..numsock-1] of integer;
implementation
{$ifdef win32}
@@ -75,13 +71,10 @@ implementation
{$i unixstuff.inc}
+type tdnsstatearr=array[0..numsock-1] of tdnsstate;
{$ifdef syncdnscore}
-var
- numsockused:integer;
- fd:array[0..numsock-1] of integer;
- state:array[0..numsock-1] of tdnsstate;
- toaddr:array[0..numsock-1] of tbinip;
+
{$ifdef win32}
const
@@ -106,46 +99,42 @@ begin
{$endif}
end;
-
-function sendquery(socknum:integer;const packet:tdnspacket;len:integer):boolean;
+procedure resolveloop(timeout:integer;var state:tdnsstatearr;numsockused:integer);
var
- ip : tbinip;
- port : ansistring;
- inaddr : TInetSockAddrV;
-begin
-{ writeln('sendquery ',decodename(state.packet,state.packetlen,12,0,a),' ',state.requesttype);}
- result := false;
- if len = 0 then exit; {no packet}
+ selectresult : integer;
+ fds : fdset;
- ip := getcurrentsystemnameserverbin(id);
+ endtime : longint;
+ starttime : longint;
+ wrapmode : boolean;
+ currenttime : integer;
- {$ifdef ipv6}{$ifdef win32}
- if toaddr[socknum].family = AF_INET6 then if (useaf = 0) then useaf := useaf_preferv6;
- {$endif}{$endif}
+ lag : ttimeval;
+ selecttimeout : ttimeval;
+ socknum:integer;
+ needprocessing:array[0..numsock-1] of boolean;
+ finished:array[0..numsock-1] of boolean;
+ a,b:integer;
- port := toport;
- toaddr[socknum] := ip;
- makeinaddrv(toaddr[socknum],port,inaddr);
+ Src : TInetSockAddrV;
+ Srcx : {$ifdef win32}sockaddr_in{$else}TInetSockAddrV{$endif} absolute Src;
+ SrcLen : Integer;
+ fromip:tbinip;
+ fromport:ansistring;
+
+ fd:array[0..numsock-1] of integer;
+ toaddr:array[0..numsock-1] of tbinip;
+ id:integer;
+ sendquerytime:array[0..numsock-1] of integer;
- sendto(fd[socknum],packet,len,0,inaddr,inaddrsize(inaddr));
- sendquerytime[socknum] := getts;
- result := true;
-end;
procedure setupsocket;
var
inAddrtemp : TInetSockAddrV;
- a:integer;
biniptemp:tbinip;
-
+ a,retrycount,porttemp:integer;
+ bindresult:boolean;
begin
- //init both sockets smultaneously, always, so they get succesive fd's
-
- {recreate sockets every time, reusing them will fail (hang) if the nameserver is changed
- also changing the nameserver can't possibly work}
- {if fd[0] > 0 then exit;}
- for a := 0 to numsock-1 do if (fd[a] > 0) then closesocket(fd[a]);
-
biniptemp := getcurrentsystemnameserverbin(id);
//must get the DNS server here so we know to init v4 or v6
@@ -153,11 +142,22 @@ begin
for a := 0 to numsockused-1 do begin
- makeinaddrv(biniptemp,inttostr( 1024 + randominteger(65536 - 1024) ),inaddrtemp);
+ retrycount := 5;
+ repeat
+ if (retrycount <= 1) then begin
+ porttemp := 0; //for the last attempt let the OS decide
+ end else begin
+ porttemp := 1024 + randominteger(65536 - 1024);
+ end;
- fd[a] := Socket(biniptemp.family,SOCK_DGRAM,0);
+ makeinaddrv(biniptemp,inttostr( porttemp ),inaddrtemp);
- If {$ifndef win32}Not{$endif} Bind(fd[a],inAddrtemp,inaddrsize(inaddrtemp)) Then begin
+ fd[a] := Socket(biniptemp.family,SOCK_DGRAM,0);
+ bindresult := {$ifdef win32}Not{$endif} Bind(fd[a],inAddrtemp,inaddrsize(inaddrtemp));
+ dec(retrycount);
+ until (retrycount <= 0) or (bindresult);
+
+ If (not bindresult) Then begin
{$ifdef win32}
raise Exception.create('unable to bind '+inttostr(WSAGetLastError));
{$else}
@@ -167,42 +167,53 @@ begin
end;
end;
-procedure resolveloop(timeout:integer);
+procedure cleanupsockets;
var
- selectresult : integer;
- fds : fdset;
+ a:integer;
+begin
+ for a := 0 to numsockused-1 do closesocket(fd[a]);
+end;
- endtime : longint;
- starttime : longint;
- wrapmode : boolean;
- currenttime : integer;
+function sendquery(socknum:integer;const packet:tdnspacket;len:integer):boolean;
+var
+ ip : tbinip;
+ port : ansistring;
+ inaddr : TInetSockAddrV;
+begin
+{ writeln('sendquery ',decodename(state.packet,state.packetlen,12,0,a),' ',state.requesttype);}
+ result := false;
+ if len = 0 then exit; {no packet}
- lag : ttimeval;
- selecttimeout : ttimeval;
- socknum:integer;
- needprocessing:array[0..numsock-1] of boolean;
- finished:array[0..numsock-1] of boolean;
- a,b:integer;
+ ip := getcurrentsystemnameserverbin(id);
- Src : TInetSockAddrV;
- Srcx : {$ifdef win32}sockaddr_in{$else}TInetSockAddrV{$endif} absolute Src;
- SrcLen : Integer;
- fromip:tbinip;
- fromport:ansistring;
+ {$ifdef ipv6}{$ifdef win32}
+ if toaddr[socknum].family = AF_INET6 then if (useaf = 0) then useaf := useaf_preferv6;
+ {$endif}{$endif}
+
+ port := toport;
+ toaddr[socknum] := ip;
+ makeinaddrv(toaddr[socknum],port,inaddr);
+
+ sendto(fd[socknum],packet,len,0,inaddr,inaddrsize(inaddr));
+ sendquerytime[socknum] := getts;
+ result := true;
+end;
begin
if timeout < mintimeout then timeout := defaulttimeout;
- starttime := getts;
- endtime := starttime + timeout;
- if (endtime and tswrap)=0 then begin
- wrapmode := false;
- end else begin
- wrapmode := true;
- end;
- endtime := endtime and tsmask;
+ starttime := getts;
+ endtime := starttime + timeout;
+ if (endtime and tswrap)=0 then begin
+ wrapmode := false;
+ end else begin
+ wrapmode := true;
+ end;
+ endtime := endtime and tsmask;
setupsocket;
+
+
for socknum := 0 to numsockused-1 do begin
needprocessing[socknum] := true;
finished[socknum] := false;
@@ -223,6 +234,7 @@ begin
if finished[a] then inc(b);
end;
if (b = numsockused) then begin
+ cleanupsockets;
exit;
end;
//onrequestdone(self,0);
@@ -282,6 +294,7 @@ begin
reportlag(id,-1);
if (currenttime >= endtime) and ((not wrapmode) or (currenttime < starttime)) then begin
+ cleanupsockets;
exit;
end else begin
//resend
@@ -302,6 +315,10 @@ var
a:integer;
biniptemp:tbinip;
l:tbiniplist;
+
+ numsockused:integer;
+ state:tdnsstatearr;
+
begin
ipstrtobin(name,biniptemp);
if biniptemp.family <> 0 then begin
@@ -350,7 +367,7 @@ begin
end;
{$endif}
- resolveloop(timeout);
+ resolveloop(timeout,state,numsockused);
if (numsockused = 1) then begin
biniplist_addlist(result,state[0].resultlist);
@@ -378,6 +395,8 @@ end;
function reverselookup(ip:tbinip;timeout:integer):ansistring;
var
dummy : integer;
+ numsockused:integer;
+ state:tdnsstatearr;
begin
{$ifdef win32}
if usewindns then begin
@@ -388,7 +407,7 @@ begin
{$ifdef syncdnscore}
setstate_reverse(ip,state[0]);
numsockused := 1;
- resolveloop(timeout);
+ resolveloop(timeout,state,numsockused);
result := state[0].resultstr;
{$endif}
end;