My Net-SNMP version and configuration info is below. I also attached
some information about my system.
$ net-snmp-config --version
5.4.2.1
$ net-snmp-config --configure-options
'--prefix=/usr' '--build=x86_64-pc-linux-gnu'
'--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
'--localstatedir=/var/lib' '--libdir=/usr/lib64'
'--with-install-prefix=/home/tmp/portage/net-analyzer/net-snmp-5.4.2.1-r1/image/'
'--with-sys-location=Unknown' '--with-sys-contact=r...@unknown'
'--with-default-snmp-version=3' '--with-mib-modules=host
ucd-snmp/dlmod' '--with-logfile=/var/log/net-snmpd.log'
'--with-persistent-directory=/var/lib/net-snmp'
'--enable-ucd-snmp-compatibility' '--enable-shared'
'--enable-as-needed' '--disable-mfd-rewrites' '--enable-embedded-perl'
'--enable-ipv6' '--disable-internal-md5' '--with-openssl'
'--with-libwrap' '--without-rpm' '--without-bzip2' '--without-zlib'
'--without-elf' '--with-python-modules'
'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu'
'CFLAGS= -march=nocona -O2 -pipe -ggdb' 'LDFLAGS=-Wl,-O1'
---------------------------------------------------------
Net-SNMP configuration summary:
---------------------------------------------------------
SNMP Versions Supported: 1 2c 3
UCD-SNMP compatability: enabled
Net-SNMP Version: 5.4.2.1
Building for: linux
Network transport support: Callback Unix TCP UDP TCPIPv6 UDPIPv6
SNMPv3 Security Modules: usm
Agent MIB code: host ucd-snmp/dlmod default_modules =>
host/hr_system host/hr_storage host/hr_device host/hr_other
host/hr_proc host/hr_network host/hr_print host/hr_disk
host/hr_partition host/hr_filesys host/hr_swrun host/hr_swinst
snmpv3mibs mibII ucd_snmp notification notification-log-mib target
agent_mibs agentx disman/event disman/schedule utilities host
Embedded Perl support: enabled
SNMP Perl modules: building -- embeddable
SNMP Python modules: building for /usr/bin/python
Authentication support: MD5 SHA1
Encryption support: DES AES
---------------------------------------------------------
On Fri, Jun 4, 2010 at 14:17, Bart Van Assche <[email protected]> wrote:
> On Fri, Jun 4, 2010 at 1:34 AM, Brendan Tauras <[email protected]> wrote:
>>
>> Thank you for the advice. It helped me learn more about the Net-SNMP
>> library, but unfortunately it did not solve the issue with
>> uninitialized syscall data.
>>
>> I used memset() to initialize the "struct snmp_session" before passing
>> it to snmp_sess_init(), but I cannot memset() the "struct snmp_pdu"
>> because it is allocated and initialized by snmp_pdu_create() before I
>> can do any initialization.
>>
>> I also tried adding null byte padding to the end of the character
>> arrays pointed to in the "hosts" and "oids" arrays in the async app (
>> http://www.net-snmp.org/wiki/index.php/TUT:Simple_Async_Application ).
>> The initialization did not stop the valgrind errors (see attached
>> files asyncapp.c and gdb.log).
>>
>> I think in the function header in snmpUDPDomain.c:184:
>>
>> static int netsnmp_udp_send(netsnmp_transport *t, void *buf, int size,
>> void **opaque, int *olength)
>>
>> "void *buf" is actually a "struct snmp_session *"/"netsnmp_session *",
>> but I do not know what type "void **opaque" is. I noticed that the
>> "peername" pointer in "buf" is invalid when examining with gdb (see
>> attached file gdb.log) :
>>
>> peername = 0x114c10000 <Address 0x114c10000 out of bounds>
>>
>> Here's the valgrind error message again from the asynchronous context
>> in case you have any other thoughts:
>>
>> ==798== 8 errors in context 2 of 7:
>> ==798== Syscall param ÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝ
>> points to uninitialised byte(s)
>> ==798== at 0x51C2A60: __sendmsg_nocancel (in /lib64/libc-2.10.1.so)
>> ==798== by 0x4E8BB0F: netsnmp_udp_send (snmpUDPDomain.c:184)
>> ==798== by 0x4E60AB2: snmp_sess_async_send (snmp_api.c:4862)
>> ==798== by 0x401315: asynch_response (asyncapp.c:188)
>> ==798== by 0x4E64BB0: _sess_process_packet (snmp_api.c:5239)
>> ==798== by 0x4E669B3: _sess_read (snmp_api.c:5742)
>> ==798== by 0x4E671B0: snmp_sess_read (snmp_api.c:5761)
>> ==798== by 0x4E671F1: snmp_read (snmp_api.c:5378)
>> ==798== by 0x401045: asynchronous (asyncapp.c:254)
>> ==798== by 0x4014E4: main (asyncapp.c:276)
>> ==798== Address 0x7fefff6c8 is on thread 1's stack
>> ==798== Uninitialised value was created by a stack allocation
>> ==798== at 0x4E8B9A2: netsnmp_udp_send (snmpUDPDomain.c:246)
>
> With which Net-SNMP version did this occur ?
>
> Bart.
>
Portage 2.1.8.3 (default/linux/amd64/10.0, gcc-4.3.4, glibc-2.10.1-r1,
2.6.32-gentoo-r7 x86_64)
=================================================================
System uname:
linux-2.6.32-gentoo-r7-x86_64-intel-r-_core-tm-2_duo_cpu_t95...@_2.60ghz-with-gentoo-1.12.13
Timestamp of tree: Sat, 05 Jun 2010 16:15:01 +0000
app-shells/bash: 4.0_p37
dev-java/java-config: 2.1.10
dev-lang/python: 2.6.5-r2
dev-util/cmake: 2.6.4-r3
sys-apps/baselayout: 1.12.13
sys-apps/sandbox: 1.6-r2
sys-devel/autoconf: 2.13, 2.63-r1
sys-devel/automake: 1.9.6-r3, 1.10.3, 1.11.1
sys-devel/binutils: 2.18-r3
sys-devel/gcc: 4.3.4
sys-devel/gcc-config: 1.4.1
sys-devel/libtool: 2.2.6b
virtual/os-headers: 2.6.30-r1
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -...@eula dlj-1.1 PUEL"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=nocona -O2 -pipe -ggdb"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/X11/xkb /usr/share/config"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/
/etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/sandbox.d
/etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d
/etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=nocona -O2 -pipe -ggdb"
DISTDIR="/usr/portage/distfiles"
FEATURES="assume-digests distlocks fixpackages news parallel-fetch
protect-owned sandbox sfperms splitdebug strict unmerge-logs unmerge-orphans
userfetch"
GENTOO_MIRRORS="http://gentoo.chem.wisc.edu/gentoo
http://gentoo.cites.uiuc.edu/pub/gentoo/ http://gentoo.osuosl.org/
http://open-systems.ufl.edu/mirrors/gentoo/
http://gentoo.mirrors.tds.net/gentoo/";
LDFLAGS="-Wl,-O1"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync21.us.gentoo.org/gentoo-portage"
USE="3dnow 3dnowext acl acpi alsa amd64 berkdb bzip2 cli cracklib crypt cups
custom-cflags custom-cpuopts custom-cxxflags custom-optimization cxx dbus dri
fortran gdbm gpm hal hardened iconv ipv6 mmx mmxext modules mudflap multilib
ncurses nls nptl nptlonly nvidia opengl openmp pam pcre perl pppd python
qt3support readline reflection sdl session spl sse sse2 ssl ssse3 sysfs tcpd
threads unicode vmx xinerama xorg zlib" ALSA_CARDS="hda-intel intel8x0
intel8x0m usb-audio" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop
empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul
mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions
alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file
authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user
autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires
ext_filter file_cache filter headers include info log_config logio mem_cache
mime mime_magic negotiation rewrite setenvif speling status unique_id userdir
usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="evdev keyboard mouse
synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780
lb216 lcdm001 mtxorb ncurses text" QEMU_SOFTMMU_TARGETS="i386 x86_64"
QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby18" USERLAND="GNU"
VIDEO_CARDS="nvidia fbdev vesa" XTABLES_ADDONS="quota2 psd pknock lscan length2
ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal
rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LANG,
LC_ALL, LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS,
PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
------------------------------------------------------------------------------
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