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if 256+ seconds passed since last read;
fix cases where we switch to next search domain instead of switching
to new server
optimize ip4/ip6 combined cases;
rewrite for(;;) loops so that it's clearer what's going on;
document buffer usage;
add TODOs and FIXMEs (for one, gethostbyname2 does not fill
->h_aliases field in the result AT ALL, and is iffy in general)
text data bss dec hex filename
- 245898 1403 11904 259205 3f485 libuClibc-0.9.30-svn.so
+ 245785 1403 11904 259092 3f414 libuClibc-0.9.30-svn.so
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text data bss dec hex filename
- 130 156 0 286 11e libc/stdlib/random.o
+ 130 148 0 278 116 libc/stdlib/random.o
- 586 0 0 586 24a libc/stdlib/random_r.o
+ 570 0 0 570 23a libc/stdlib/random_r.o
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text data bss dec hex filename
- 45 0 480 525 20d libc/inet/gethostbyname.o
+ 18 0 0 18 12 libc/inet/gethostbyname.o
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Appears to build fine (several .configs tried)
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delete some duplication in constants.
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delete two stray files which compile to nothing
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almost no code changes
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in _res structure. Used by busybox's nslookup.
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add largish comment explaining what we are doing, and why;
fixes to make IPv6-only resolver possible
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in __dns_lookup.
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configurable. we don't use most of it anyway.
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in one of recent commits :)
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text data bss dec hex filename
- 1545 2 4 1551 60f libc/inet/dnslookup.o
+ 1528 2 4 1534 5fe libc/inet/dnslookup.o
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do not treat negative response as error
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"gethostbyname() fails if DNS server returns more than 23 addresses"
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No logic changes. Code size is the same too.
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text data bss dec hex filename
- 259 0 0 259 103 libc/inet/herror.o
+ 243 0 0 243 f3 libc/inet/herror.o
- 720 0 0 720 2d0 libc/inet/ns_name.o
+ 710 0 0 710 2c6 libc/inet/ns_name.o
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/etc/hosts and it has IPv4 address there.
The most common example is "127.0.0.1 localhost".
We don't want "ping localhost" to stall and time out on IPv6
queries to, say, inaccessible DNS server, right?
- 655 0 0 655 28f libc/inet/gethostbyname2_r.o
+ 685 0 0 685 2ad libc/inet/gethostbyname2_r.o
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For now, a straight revert; we can decide later wheter we want to do something
more.
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definition. I seems to produce spurious warning:
libc/inet/resolv.c:1549: warning: 'visibility' attribute ignored on non-class types
(seems like gcc bug)
and it is not really needed - attribute_hidden was already
specified in function _declaration_ so it is not necessary here.
No code changes (verified with objdump).
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text data bss dec hex filename
- 230 0 9 239 ef libc/inet/gethostent.o
+ 224 0 9 233 e9 libc/inet/gethostent.o
- 782 0 0 782 30e libc/inet/read_etc_hosts_r.o
+ 767 0 0 767 2ff libc/inet/read_etc_hosts_r.o
Run tested.
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we were closing a FILE, but did not record that fact by setting
a variable to NULL, and then we used it for reading!
While at it, small reduction in bss.
Run tested.
text data bss dec hex filename
- 210 0 12 222 de libc/inet/gethostent.o
+ 230 0 9 239 ef libc/inet/gethostent.o
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The obsolete functions bcopy, index, etc. are not supposed to be used within
uClibc itself. Hence, there is no libc_hidden_def for them, but the previous
patch did not just move libc_hidden_protos, it also added new ones for the
legacy functions. As a result, programs which use these functions can no
longer link with uClibc.
This fixes it by removing the unnecessary libc_hidden_protos. I've also
removed all inclusions of <strings.h> from uClibc source files: since we
define _GNU_SOURCE, it is sufficient to include <string.h>. We then do not
need to duplicate the libc_hidden_proto block in <strings.h>.
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1. names with two consecutive dots are not valid
2. if name ends with a dot, dont try appending search domain(s)
alos a few small optimisations are here.
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like
o UCLIBC_HAS_GNU_ERROR
o UCLIBC_HAS_BSD_ERR
o UCLIBC_HAS_PTY
o UCLIBC_HAS_GETPT (1)
o UCLIBC_SYSCALL_STUBS
o UCLIBC_SYSCALL_STUB_WARNING
o UCLIBC_LINUX_SPECIFIC (2)
o UCLIBC_BSD_SPECIFIC (3)
o UCLIBC_NTP_LEGACY (4)
o UCLIBC_SV4_DEPRECATED (5)
o UCLIBC_HAVE_REALTIME (6)
o UCLIBC_HAVE_ADVANCED_REALTIME (7)
o UCLIBC_HAVE_EPOLL (8)
o UCLIBC_HAVE_XATTR (9)
o UCLIBC_HAVE_PROFILING (10)
(1) make non-standard getpt optional and implement standard posix_openpt
(2) fstatfs(), inotify_*(), ioperm(), iopl(), madvise(), modify_ldt(),
personality()
ppoll(), setresuid()
(3) mincore(), getdomainname(), setdomainname()
(4) ntp_adjtime(), ntp_gettime() aliases
(5) ustat() [use statfs(2) in your code instead]
(6) All marked as "(REALTIME)" in SUSv3
(7) All marked as "(ADVANCED REALTIME)" in SUSv3
(8) epoll_create(), epoll_ctl(), epoll_wait()
(9) all Extended Attributes
(10) helpers for gcc's -finstrument-functions
- Fixes _dl_exit()
- Implements sleep(3) for !UCLIBC_HAVE_REALTIME
- Implements usleep(3) for !UCLIBC_HAVE_REALTIME
- adds #warning about incorrect posix_fadvise{,64}()
- removes unused and unwanted uselib()
Net outcome is that an allnoconfig with HAVE_SHARED is now about 88k instead
of formerly 130k.
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IPv6 DNS resolv. rfc4159 mandated this 3 years ago. Closes bug 1020.
Also cleans up some stype inconsistensied and saves 2 bytes of rw data.
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by adding <unistd.h> header file.
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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in string.h and strings.h. This caught unguarded string ops in
libc/inet/ethers.c __ether_line_w() function.
I will wait for fallout reports for a week or so,
then continue converting more libc_hidden_proto's.
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(patch by Bernd Schmidt <bernds_cb1 at t-online.de>)
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__dns_lookup(). This avoids segmentation faults when more than 1024
file descriptors are used by an application.
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MontaVista noticed that when their kernels were configured to trap on unaligned
access gethostbyname_r could mysteriously crash. I tracked this down to an
unaligned buffer being passed to gethostbyname_r from some other part of uClibc
(afraid I don't remember where from any more). We have to pad the beginning of
the buffer to a pointer alignment before we store pointers in it.
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IPv6 entries in /etc/hosts. Previous only the first of these host would work,
as uClibc would read the /etc/hosts file from top to bottom, failing if the
first hit did not match the IP type.
Now uClibc will continue reading, even if the first correct entry name, but wrong IP
type fails. Thus, allowing a second correct entry name with correct IP type
will result in a name resolve.
Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
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I have successfully made gethostbyname_r(), res_init(), and gethostid() fully
reentrant. In addition, I have added a NULL check to inet_aton(). This is
where SEG FAULTs were coming from when gethostbyname_r() was called.
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Hi Erik,
Thanks for all your great work. I found a set of bugs in
resolv.c . Basically, there is code that looks like:
BIGLOCK;
__nameserversXX=__nameservers;
__nameserverXX=__nameserver;
BIGUNLOCK;
i = __dns_lookup(dname, type, __nameserversXX, __nameserverXX, &packet, &a);
which is a problem because the declarations are
int __nameservers;
char * __nameserver[MAX_SERVERS];
int __searchdomains;
char * __searchdomain[MAX_SEARCH];
so you can see that __nameserver is a pointer. Copying the
pointer to __nameserverXX doesn't protect the global variable
space. I have attached a patch and the new file. I hope you
will incorporate these bug fixes. I spent quite a bit of time
tracking them down.
Many thanks,
Ron
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