On 17 March 2014 20:23, Michel Stam <[email protected]> wrote:
Thanks Bernhard.
Cheers
Michel Stam
On 17 mrt. 2014, at 20:19, "Bernhard Reutner-Fischer"
<[email protected]> wrote:
On 13 March 2014 11:43:05 Michel Stam <[email protected]>
wrote:
Dear mailing list,
I have seen very little response on this topic; Would it be
possible to apply this patch to trunk?
I'm verifying the patch right now, will apply it afterwards. Will
followup in the push.
Thanks!
I would like to add that without this patch, the behaviour in
uClibc differs from glibc.
Best regads,
Michel Stam
On 03/03/2014 11:46 AM, Michel Stam wrote:
Commit e1420eca7374cd8f583e9d774c890645a205aaee fixed a bug where a
response code should mean the next server is tried. However, it
tries
only the next search domain, and never skips to the next server.
In my specific situation, I was using tmdns as a DNS -> mDNS
bridge to resolve mDNS names. tmdns returns SERVFAIL on any
domain that does not end in .local.
uClibc then tries all the search domains in /etc/resolv.conf and
gives up, not jumping to the next nameserver in the list (in my
case the real nameserver). Thus, any non-.local domain never got
resolved.
My resolv.conf;
domain bla.net
search bla.net
nameserver 127.0.0.1
nameserver 172.16.1.1
The patch I have attached basically allows SERVFAIL to go back to
the case as it was before 0.9.32, except that search domains are
still tried.
Not entirely happy with that.
How about the attached instead, without looking at the size(1)
implications yet?
Revert e1420eca7374cd8f583e9d774c890645a205aaee
Rephrase __dns_lookup rcode handling to fix bug 660 and fix ???? as
reported by Michel Stam.
Details:
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by
resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 193.170.61.4
nameserver 193.170.61.5
#nameserver 131.130.250.130
nameserver 192.168.100.42
search loc lane wifi wien berlin ac.at at
$ for i in nxdomain univie nic;do echo "# $i";./ghbn $i;echo
"#############################################";done
# nxdomain
argc=2 argv=0x7fffd5941508 envp=0x7fffd5941520
ELF header=0x7f3dd946f000
First Dynamic section entry=0x7f3dd9678ea0
Scanning DYNAMIC section
Done scanning DYNAMIC section
About to do library loader relocations
Done relocating ldso; we can now use globals and make function calls!
_dl_get_ready_to_run:450: Cool, ldso survived making function calls
_dl_malloc:240: mmapping more memory
_dl_ldsopath_init:156: Lib Loader: (0xd946f000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0: using path:
/scratch/src/uClibc.push7/lib
_dl_load_elf_shared_library:772: Found TLS header for
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_load_elf_shared_library:799: Relocated TLS initial image from
0x2ca968 to 0x7f3dd9466968 (size = 0x8)
_dl_get_ready_to_run:1053: Loading: (0x7f3dd919c000)
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_get_ready_to_run:1053: Loading: (0x7f3dd946f000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0
_dl_get_ready_to_run:1194: Calling init_tls()!
_dl_malloc:240: mmapping more memory
_dl_malloc:240: mmapping more memory
_dl_get_ready_to_run:1296: Beginning relocation fixups
_dl_get_ready_to_run:1326: Calling _dl_allocate_tls_init()!
transfering control to application @ 0x400550
Nothing found in /etc/hosts
Looking up type 1 answer for 'nxdomain'
adding search loc
adding search lane
adding search wifi
adding search wien
adding search berlin
adding search ac.at
adding search at
nameservers = 3
encoding header
lookup name: nxdomain
On try 8, sending query to 193.170.61.4, port 53
Xmit packet len:26 id:2 qr:0
len:26 id:2 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: nxdomain
On try 7, sending query to 193.170.61.5, port 53
Xmit packet len:26 id:3 qr:0
len:26 id:3 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: nxdomain
On try 6, sending query to 192.168.100.42, port 53
Xmit packet len:26 id:4 qr:0
len:101 id:4 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:-1 sdomains:7
encoding header
lookup name: nxdomain.loc
On try 5, sending query to 192.168.100.42, port 53
Xmit packet len:30 id:5 qr:0
len:81 id:5 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:0 sdomains:7
encoding header
lookup name: nxdomain.lane
On try 4, sending query to 192.168.100.42, port 53
Xmit packet len:31 id:6 qr:0
len:85 id:6 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:1 sdomains:7
encoding header
lookup name: nxdomain.wifi
On try 3, sending query to 192.168.100.42, port 53
Xmit packet len:31 id:7 qr:0
len:85 id:7 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:2 sdomains:7
encoding header
lookup name: nxdomain.wien
On try 2, sending query to 192.168.100.42, port 53
Xmit packet len:31 id:8 qr:0
len:98 id:8 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:3 sdomains:7
encoding header
lookup name: nxdomain.berlin
On try 1, sending query to 192.168.100.42, port 53
Xmit packet len:33 id:9 qr:0
len:100 id:9 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:4 sdomains:7
encoding header
lookup name: nxdomain.ac.at
On try 0, sending query to 192.168.100.42, port 53
Xmit packet len:32 id:10 qr:0
len:96 id:10 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:5 sdomains:7
__dns_lookup returned < 0
ERROR: : Resolver error
#############################################
# univie
argc=2 argv=0x7ffff9da32a8 envp=0x7ffff9da32c0
ELF header=0x7f517874d000
First Dynamic section entry=0x7f5178956ea0
Scanning DYNAMIC section
Done scanning DYNAMIC section
About to do library loader relocations
Done relocating ldso; we can now use globals and make function calls!
_dl_get_ready_to_run:450: Cool, ldso survived making function calls
_dl_malloc:240: mmapping more memory
_dl_ldsopath_init:156: Lib Loader: (0x7874d000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0: using path:
/scratch/src/uClibc.push7/lib
_dl_load_elf_shared_library:772: Found TLS header for
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_load_elf_shared_library:799: Relocated TLS initial image from
0x2ca968 to 0x7f5178744968 (size = 0x8)
_dl_get_ready_to_run:1053: Loading: (0x7f517847a000)
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_get_ready_to_run:1053: Loading: (0x7f517874d000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0
_dl_get_ready_to_run:1194: Calling init_tls()!
_dl_malloc:240: mmapping more memory
_dl_malloc:240: mmapping more memory
_dl_get_ready_to_run:1296: Beginning relocation fixups
_dl_get_ready_to_run:1326: Calling _dl_allocate_tls_init()!
transfering control to application @ 0x400550
Nothing found in /etc/hosts
Looking up type 1 answer for 'univie'
adding search loc
adding search lane
adding search wifi
adding search wien
adding search berlin
adding search ac.at
adding search at
nameservers = 3
encoding header
lookup name: univie
On try 8, sending query to 193.170.61.4, port 53
Xmit packet len:24 id:2 qr:0
len:24 id:2 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: univie
On try 7, sending query to 193.170.61.5, port 53
Xmit packet len:24 id:3 qr:0
len:24 id:3 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: univie
On try 6, sending query to 192.168.100.42, port 53
Xmit packet len:24 id:4 qr:0
len:99 id:4 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:-1 sdomains:7
encoding header
lookup name: univie.loc
On try 5, sending query to 192.168.100.42, port 53
Xmit packet len:28 id:5 qr:0
len:79 id:5 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:0 sdomains:7
encoding header
lookup name: univie.lane
On try 4, sending query to 192.168.100.42, port 53
Xmit packet len:29 id:6 qr:0
len:83 id:6 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:1 sdomains:7
encoding header
lookup name: univie.wifi
On try 3, sending query to 192.168.100.42, port 53
Xmit packet len:29 id:7 qr:0
len:83 id:7 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:2 sdomains:7
encoding header
lookup name: univie.wien
On try 2, sending query to 192.168.100.42, port 53
Xmit packet len:29 id:8 qr:0
len:96 id:8 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:3 sdomains:7
encoding header
lookup name: univie.berlin
On try 1, sending query to 192.168.100.42, port 53
Xmit packet len:31 id:9 qr:0
len:98 id:9 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:4 sdomains:7
encoding header
lookup name: univie.ac.at
On try 0, sending query to 192.168.100.42, port 53
Xmit packet len:30 id:10 qr:0
len:257 id:10 qr:1
Got response (i think)!
qrcount=1,ancount=1,nscount=13,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=0
Skipping question 0 at 12
Length of question 0 is 18
Decoding answer at pos 30
decode_answer(start): off 30, len 257
Total decode len = 2
i=2,rdlength=4
Answer name = |univie.ac.at|
Answer type = |1|
a.add_count:0 a.rdlength:4 a.rdata:0x63f03a
name : univie.ac.at
fam : 2
addrlen: 4
addr : 131.130.70.17
total 1 addresses
aliases: univie
#############################################
# nic
argc=2 argv=0x7fff5356d078 envp=0x7fff5356d090
ELF header=0x7f2c1397f000
First Dynamic section entry=0x7f2c13b88ea0
Scanning DYNAMIC section
Done scanning DYNAMIC section
About to do library loader relocations
Done relocating ldso; we can now use globals and make function calls!
_dl_get_ready_to_run:450: Cool, ldso survived making function calls
_dl_malloc:240: mmapping more memory
_dl_ldsopath_init:156: Lib Loader: (0x1397f000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0: using path:
/scratch/src/uClibc.push7/lib
_dl_load_elf_shared_library:772: Found TLS header for
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_load_elf_shared_library:799: Relocated TLS initial image from
0x2ca968 to 0x7f2c13976968 (size = 0x8)
_dl_get_ready_to_run:1053: Loading: (0x7f2c136ac000)
/scratch/src/uClibc.push7/lib/libc.so.0
_dl_get_ready_to_run:1053: Loading: (0x7f2c1397f000)
/scratch/src/uClibc.push7/lib/ld64-uClibc.so.0
_dl_get_ready_to_run:1194: Calling init_tls()!
_dl_malloc:240: mmapping more memory
_dl_malloc:240: mmapping more memory
_dl_get_ready_to_run:1296: Beginning relocation fixups
_dl_get_ready_to_run:1326: Calling _dl_allocate_tls_init()!
transfering control to application @ 0x400550
Nothing found in /etc/hosts
Looking up type 1 answer for 'nic'
adding search loc
adding search lane
adding search wifi
adding search wien
adding search berlin
adding search ac.at
adding search at
nameservers = 3
encoding header
lookup name: nic
On try 8, sending query to 193.170.61.4, port 53
Xmit packet len:21 id:2 qr:0
len:21 id:2 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: nic
On try 7, sending query to 193.170.61.5, port 53
Xmit packet len:21 id:3 qr:0
len:21 id:3 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=0,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=0,rcode=5
encoding header
lookup name: nic
On try 6, sending query to 192.168.100.42, port 53
Xmit packet len:21 id:4 qr:0
len:96 id:4 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=3
variant:-1 sdomains:7
encoding header
lookup name: nic.loc
On try 5, sending query to 192.168.100.42, port 53
Xmit packet len:25 id:5 qr:0
len:76 id:5 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:0 sdomains:7
encoding header
lookup name: nic.lane
On try 4, sending query to 192.168.100.42, port 53
Xmit packet len:26 id:6 qr:0
len:80 id:6 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:1 sdomains:7
encoding header
lookup name: nic.wifi
On try 3, sending query to 192.168.100.42, port 53
Xmit packet len:26 id:7 qr:0
len:80 id:7 qr:1
Got response (i think)!
qrcount=1,ancount=0,nscount=1,arcount=0
opcode=0,aa=1,tc=0,rd=1,ra=1,rcode=3
variant:2 sdomains:7
encoding header
lookup name: nic.wien
On try 2, sending query to 192.168.100.42, port 53
Xmit packet len:26 id:8 qr:0
len:198 id:8 qr:1
Got response (i think)!
qrcount=1,ancount=1,nscount=3,arcount=5
opcode=0,aa=0,tc=0,rd=1,ra=1,rcode=0
Skipping question 0 at 12
Length of question 0 is 14
Decoding answer at pos 26
decode_answer(start): off 26, len 198
Total decode len = 2
i=2,rdlength=4
Answer name = |nic.wien|
Answer type = |1|
a.add_count:0 a.rdlength:4 a.rdata:0x1d76036
name : nic.wien
fam : 2
addrlen: 4
addr : 188.40.87.61
total 1 addresses
aliases: nic
#############################################
vs.
$ for i in nxdomain univie nic;do echo "# $i";./ghbn_glibc $i;echo
"#############################################";done
# nxdomain
ERROR: : Resolver Error 0 (no error)
#############################################
# univie
name : univie.ac.at
fam : 2
addrlen: 4
addr : 131.130.70.17
total 1 addresses
aliases:
#############################################
# nic
name : nic.wien
fam : 2
addrlen: 4
addr : 188.40.87.61
total 1 addresses
aliases:
#############################################
which leaves us with a diff for 'nxdomain' which you might want to
rectify in an incremental update?
TIA && cheers,
