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SNMP: User documentation, grammar improvements

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Vojtech Vilimek 2024-08-20 11:11:58 +02:00
parent 6e95cc521e
commit 305f873c6e
7 changed files with 396 additions and 23 deletions
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351
doc/bird.sgml
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@ -535,7 +535,7 @@ include "tablename.conf";;
Set global defaults of MRTdump options. See <cf/mrtdump/ in the Set global defaults of MRTdump options. See <cf/mrtdump/ in the
following section. Default: off. following section. Default: off.
<tag><label id="opt-filter">filter <m/name local variables/{ <m/commands/ }</tag> <tag><label id="opt-filter">filter <m/name local variables/ { <m/commands/ }</tag>
Define a filter. You can learn more about filters in the following Define a filter. You can learn more about filters in the following
chapter. chapter.
@ -548,7 +548,7 @@ include "tablename.conf";;
<cf><m/name/</cf>). You can learn more about configuring protocols in <cf><m/name/</cf>). You can learn more about configuring protocols in
their own chapters. When <cf>from <m/name2/</cf> expression is used, their own chapters. When <cf>from <m/name2/</cf> expression is used,
initial protocol options are taken from protocol or template initial protocol options are taken from protocol or template
<cf><m/name2/</cf> You can run more than one instance of most protocols <cf><m/name2/</cf>. You can run more than one instance of most protocols
(like RIP or BGP). By default, no instances are configured. (like RIP or BGP). By default, no instances are configured.
<tag><label id="opt-template">template rip|ospf|bgp|<m/.../ [<m/name/ [from <m/name2/]] { <m>protocol options</m> }</tag> <tag><label id="opt-template">template rip|ospf|bgp|<m/.../ [<m/name/ [from <m/name2/]] { <m>protocol options</m> }</tag>
@ -5432,16 +5432,355 @@ protocol static {
<label id="snmp"> <label id="snmp">
<p>The Simple Network Management Protocol is protocol for collecting and <p>The Simple Network Management Protocol is protocol for collecting and
managing network devices. managing network devices. Managed information is divided into so called MIBs --
Management Information Bases. Each MIB describe information and semantics it
provides. The SNMP architecture is very flexible, some MIB are standartized by
IETF, others published by independent third parties.
<p>The BIRD SNMP support is achieved by an additional component -- a SNMP deamon <p>The BIRD SNMP support is achieved by an additional component -- a SNMP daemon
acting as AgentX master agent. Currently we only support TCP connection. with AgentX protocol support. The SNMP daemon acts as an AgentX master agent and
deal with user authentication, access control and managing MIB regions in OID
tree. BIRD instance acts as AgentX subagent, register configurated MIBs and
provides queried data. The AgentX communication protocol between master agent
and subagents does not consider security what so ever. It is therefore upon the
user to use the AgentX in a secure way. This can be achieved either by using
Unix Domain sockets on same host or by using secure tunnel. Note that following
sections containing pieces of Net-SNMP configuraiton are only meant as a helper
for cold start, or as a pointer what to search for, not as full reference. For
full reference consult the original manpages.
<p>An example of SNMP protocol configuration. <sect1>SNMP Daemon configuration
<p>We recommend you to use Net-SNMP implementation of daemon and utilities, quick
guide below assume that. Net-SNMP implementation is quite popular so you should
find it's packages inside your distribution package manager.
<sect2>Example snmpd configuration
<p>
<code>
# file /etc/snmp/snmpd.conf
# minimal SNMPv3 config
agentx master
agentaddress udp:192.0.2.64
agentXSocket tcp:198.51.100.2
createUser snmp_name MD5 example_pass
rwuser snmp_name noauth
</code>
<sect2>AgentX Enabling
<p>
<code>
# File /etc/snmp/snmpd.conf
agentx master
agentXSocket [unix:|tcp:|tcp6:]&lt;address&gt;[,...]
agentXPerms &lt;sockperms&gt; [&lt;dirperms&gt; [&lt;user&gt;|&lt;uid&gt; [&lt;group&gt;|&lt;gid&gt;]]]
agentaddress [&lt;trasport-type&gt;:]&lt;trasport-address&gt;[,...]
</code>
<descrip>
<tag><label id="snmpd-agentx-master">agentx master</tag>
SNMP daemon will enable AgentX functionality and start listening on
configured AgentX address.
<tag><label id="snmpd-agentxsocket">agentXSocket
[unix:|tcp:|tcp6:]<m/trasport-address/[,...] </tag>
Define address to listen for AgentX subagent. Use one of <cf>unix:,
tcp:, tcp6:</cf> transport type. Other transport type are not supported
by BIRD and also not mentioned in AgentX RFC, see <rfc id="2741">.
Default: Unix Domain socket <file>/var/run/agentx/master</file>.
<tag><label id="snmpd-agentxperms">agentXPerms <m/sockperms/
[<m/dirperms/ [<m/user/|<m/uid/ [<m/group/|<m/gid/]]]</tag>
Define common permissions for AgentX listening Unix Domain sockets. Both
<m/sockperms/ and <m/dirperms/ must be octal digits like for
<m/chmod(1)/. Option <m/user/ is string and <m/uid/ is numeric user id.
Same for <m/group/ and <m/gid/.
<tag><label id="snmpd-agentaddress">agentaddress
[<m/transport-type/:]<m/trasport-address/[,...]</tag>
Define address, or list of addresses, to listen for SNMP requests (send
for example by <it/snmpwalk(1)/). You most likely want <m/trasport-type/ to
be one from <cf/udp:/, <cf/udp6:/, <cf/tcp:/, <cf/tcp6:/, <cf/unix:/,
<cf/ssh:/ but Net-SNMP support even more transport types.
Value <m/transport-address/ define address, Net-SNMP should be able to
derive <m/trasport-type/ from <m/transport-address/. Beware that for
Unix Domain socket derivation to work, the path must start with /. Also
note that the working directory of snmpd daemon is filesystem root.
Default: UDP on all IPv4 interfaces on port 161. (e.g.
<cf>agentaddress udp6:localhost:161</cf>,
<cf>agentaddress tcp:192.0.2.1</cf>,
<cf>agentaddress /var/run/mydir/agentx_master</cf>,
<cf>agentaddress localhost,/p/u1,/p/u2</cf>).
</descrip>
<sect2>Configure access
<p>You can use the SNMPv3 USM module for user authorization, or use simpler older
version SNMPv1/SNMPv2c with authentication by community. Other means of
authorization are also possible (e.g. external Kerberos) but out of scope of
this guide.
<sect3>SNMPv3 USM
<p>
<code>
# file /etc/snmp/snmpd.conf (continuation)
createUser [-e &lt;engineid&gt;] &lt;username&gt; (MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224) &lt;authpassphrase&gt; [DES|AES] [&lt;pass&gt;]
rwuser [-s secmodel] &lt;user&gt; [noauth|auth|priv [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
rouser [-s secmodel] &lt;user&gt; [noauth|auth|priv [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
</code>
<descrip>
<tag><label id="snmpd-createuser">createUser [-e <m/engineid/]
<m/username/ (MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224)
<m/authpassphrase/ [DES|AES] [<m/privpassphrase/] </tag>
Create user with in order specified username, authentication type,
authentication password, private protocol and private password. If the
private password is not used, it fallbacks to same password as the
authentication one.
<tag><label id="snmpd-rwuser">rwuser [-s <m/secmodel/] <m/user/
[noauth|auth|priv [<m/oid/ | -V <m/view/ [<m/context/]]]</tag>
Give user with selected security level read-write permissions
to the defined <m/oid/ OID subtree or <m/view/ view,
see <ref id="snmp_view" name="view definition">. Security level
<cf>noauth</cf> does not require authentication, <cf>auth</cf> requires
authentication and <cf>priv</cf> authentication with enforced message
encryption. View is a Net-SNMP construct to name and group set of OID
subtrees with optional context. Contexts are currently not supported by
BIRD.
<tag><label id="snmpd-rouser">rouser [-s <m/secmodel/] <m/user/
[noauth|auth|priv [<m/oid/ | -V <m/view/ [<m/context/]]]</tag>
Same as <cf>rwuser</cf> but only with read permissions.
</descrip>
<sect3>SNMPv1/SNMPv2c community-based
<p>
<code>
# file /etc/snmp/snmpd.conf (continuation)
rwcommunity &lt;community&gt; [&lt;source&gt; [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
rocommunity &lt;community&gt; [&lt;source&gt; [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
rwcommunity6 &lt;community&gt; [&lt;source&gt; [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
rocommunity6 &lt;community&gt; [&lt;source&gt; [&lt;oid&gt; | -V &lt;view&gt; [&lt;context&gt;]]]
view &lt;vname&gt; (include|exclude) &lt;oid&gt; [&lt;mask&gt;]
</code>
<descrip>
<tag><label id="snmpd-rwcommunity">rwcommunity <m/community/ [<m/source/
[<m/oid/ | -V <m/view/ [<m/context/]]]</tag>
Create a community with read-write permissions named <m/community/.
Option <m/source/ is used to restrict senders of request, use
<cf>"default"</cf> as a placeholder in doubts. You can also restrict
accessible regions of OID tree to OID subtree of <m/oid/ or named
<m/view/, otherwise the access is unrestricted to the whole OID tree.
Contexts are currently not supported by BIRD.
<tag><label id="snmpd-rocommunity">rocommunity <m/community/> [<m/source/
[<m/oid/ | -V <m/view/ [<m/context/]]]</tag>
Same as <cf>rwcommunity</cf> but only with read permissions.
<tag><label id="snmpd-rwcommunity6">rwcommunity6 <m/community/
[<m/source/ [<m/oid/ | -V <m/view/ [<m/context/]]] </tag>
Is <cf>rwcommunity</cf> for packet received using IPv6.
<tag><label id="snmpd-rocommunity6">rocommunity6 <m/community/
[<m/source/ [<m/oid/ | -V <m/view/ [<m/context/]]]</tag>
Same as <cf>rwcommunity6</cf> but only with read permissions.
<tag><label id="snmpd-view">view <m/vname/ (include|exclude) <m/oid/ [<m/mask/]</tag>
Define a named grouping of OIDs. May be used multiple times with same
<m/vname/.
</descrip>
<sect1>BIRD SNMP configuration
<p>
<code>
protocol snmp [&lt;name&gt;] {
agentx master address (default|&lt;unix_path&gt;|&lt;ip&gt; [port &lt;port&gt;]);
subagent description &lt;text&gt;;
source address &lt;ip&gt;;
registration priority &lt;num&gt;;
message timeout &lt;time&gt;;
start delay time &lt;time&gt;;
verbose &lt;switch&gt;;
mib bgp4 {
local as &lt;num&gt;;
local router id &lt;ip4&gt;;
peer &lt;name&gt;;
};
}
</code>
<descrip>
<tag><label id="snmp-master">agentx master address
(default|<m/unix_path/|<m/ip/ [port <m/port/])</tag>
Address of AgentX master. Default is <cf>"/var/run/agentx/master"</cf>.
String option <m/unix_path/ select transport over Unix Domain sockets
with selected path address. Option <m/ip/ select transport over TCP.
Default port for TCP transmission is 705.
<tag><label id="snmp-descr">subagent description <m/text/</tag>
Short string describing the subagent. Default: "bird".
<tag><label id="snmp-src-addr">source address <m/ip/</tag>
For TCP based AgentX communication sets socket's source address.
<tag><label id="snmp-reg-priority">registration priority <m/number/</tag>
Set AgentX registration priority for all MIBs. Lower values have higher
priority. Valid interval 0-255. Default: 127.
<tag><label id="snmp-msg-timeout">message timeout <m/time/ s|ms</tag>
Set timeout for all AgentX messages. With 1 second granurality with
values from interval 0-255. Default: 15 s.
<tag><label id="snmp-start-delay">start delay time <m/time/ s|ms</tag>
Wait <m/time/ before sending first packet after protocol start.
<tag><label id="snmp-verbose">verbose <m/switch/</tag>
Enable logging of events connected to AgentX master pinging. Default:
verbose logging is disabled.
<tag><label id="snmp-bgp4-mib">mib bgp4</tag>
Enable BGP4-MIB which is defined in <rfc id="4273">. The support is
limited to BGP4-MIB::bgpPeerTable; the BGP4-MIB::bgpRcvdPathAttrTable,
BGP4-MIB::bgpPathAttrTable, traps and notifications are not supported.
<tag><label id="snmp-bgp4-local-as">local as <m/number/</tag>
Specify Local As for BGP4 MIB (BGP4-MIB::bgpLocalAs.0). This option is
required.
<tag><label id="snmp-bgp4-router-id">local router id <m/IPv4 address/</tag>
Specify Router ID for BGP4 MIB (BGP4-MIB::bgpLocalIdentifier.0). This
option is required.
<tag><label id="snmp-bgp4-peer">peer <m/name/</tag>
Make information about BGP protocol <m/name/ accessible. This protocol
must over IPv4 (this limitation is introduced by the BGP4-MIB). May
be used multiple times.
</descrip>
<sect2>An example SNMP protocol configuration
<p>
<code>
protocol bgp ibgp1 {
local as 2;
router id 192.0.2.1;
/* ... */
}
protocol bgp ibgp2 {
local as 4;
router id 192.0.2.128;
/* ... */
}
protocol snmp snmp1 {
agentx master address 198.51.100.2;
mib bgp4 {
local as 2;
local router id 192.0.2.1;
peer ibgp1;
peer ibgp2;
}
}
</code>
<sect1>Accessing MIB data
<p>To save some keystrokes and to avoid putting passwords in shell history, you
could use common configuration file for all Net-SNMP command line utilities.
Here is an example:
<code> <code>
# file ~/.snmp/snmp.conf
defVersion (1|2c|3)
defCommunity &lt;community&gt;
defSecurityName &lt;username&gt;
defAuthType (MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224)
defAuthPassphrase &lt;authpass&gt;
defPrivType (DES|AES)
defPrivPassphrase &lt;privpass&gt;
clientaddr [&lt;transport-type&gt;:]&lt;transport-address&gt;
</code> </code>
<descrip>
<tag><label id="snmpcmd-version">defVersion (1|2c|3)</tag>
Select version of SNMP packets, must follow
<file>/etc/snmp/snmpd.conf</file>. Use only if community/view based
configuration.
<tag><label id="snmpcmd-community">defCommunity <m/community/</tag>
Use by default given community. Use only for SNMP version 1 and 2c as
community as kind of a username for these versions.
<tag><label id="snmpcmd-authtype">defAuthType
(MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224)</tag>
Select authentication type.
<tag><label id="snmpcmd-authpass">defAuthPassphrase <m/authpass/</tag>
Set authentication password.
<tag><label id="snmpcmd-privtype">defPrivType (DES|AES)</tag>
Select private protocols.
<tag><label id="snmpcmd-privpass">defPrivPassphrase <m/privpass/</tag>
Set private password used for encryption.
<tag><label id="snmpcmd-clientaddr">clientaddr
[<m/transport-type/:]<m/transport-address/</tag>
SNMP command line utility equivalent to <cf>agentaddress</cf> daemon
option.
</descrip>
<p>For further information, see <it/snmp.conf(5)/.
<p>Example of configuration for Net-SNMP utils.
<code>
# SNMPv3
defVersion 3
defSecurityName snmp_name
defSecurityLevel noAuthNoPriv
defAuthType MD5
defAuthPassphrase example_pass
</code>
<code>
$ # &lt;snmputil&gt; &lt;master-address&gt; &lt;oid&gt;[ &lt;oid&gt; [...]]
$ snmpget 192.0.2.64 BGP4-MIB::bgpLocalAs.0
$ snmpgetnext 192.0.2.64 BGP4-MIB::bgpPeerState BGP4-MIB::bgpPeerAdminStatus
$ snmpwalk 192.0.2.64 BGP4-MIB::bgp
$ snmptable 192.0.2.64 BGP4-MIB::bgpPeerTable
</code>
<p>We recommend you to check manpages for Net-SNMP utilities mentioned above,
such as <it/snmp_config(5)/, <it/snmpd.conf(5)/, <it/snmpd(8)/,
<it/snmp.conf(5)/, <it/snmpcmds(1)/, <it/snmpget(1)/, <it/snmpgetnext(1)/,
<it/snmpbulkget(1)/, <it/snmpwalk(1)/, <it/snmptable(1)/.
<chapt>Conclusions <chapt>Conclusions
<label id="conclusion"> <label id="conclusion">

5
doc/snmp.conf.example Normal file
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@ -0,0 +1,5 @@
defSecurityName snmp_name
defAuthType MD5
defAuthPassphrase test_pass
defSecurityLevel noAuthNoPriv
defVersion 3

18
doc/snmpd.conf.example Normal file
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@ -0,0 +1,18 @@
#
# snmpd configuration file
#
# SNMP connection address
agentaddress 127.0.0.1
# enable AgentX protocol
master agentx
# AgentX connection address
agentXSocket tcp:localhost:705
# Create example user
createUser snmp_name MD5 test_pass
rwuser snmp_name noauth

6
proto/snmp/bgp4_mib.c
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@ -749,12 +749,14 @@ bgp4_next_peer(struct mib_walk_state *state, struct snmp_pdu *c)
void void
snmp_bgp4_show_info(struct snmp_proto *p) snmp_bgp4_show_info(struct snmp_proto *p)
{ {
/* TODO: Use special code (not -1006) for printing MIB, or BGP4-MIB data?
* don't forget add it into doc/reply_code */
cli_msg(-1006, " BGP4-MIB"); cli_msg(-1006, " BGP4-MIB");
cli_msg(-1006, " Local AS %u", p->bgp4_local_as); cli_msg(-1006, " Local AS %u", p->bgp4_local_as);
cli_msg(-1006, " Local router id %R", p->bgp4_local_id); cli_msg(-1006, " Local router id %R", p->bgp4_local_id);
cli_msg(-1006, " BGP peers"); cli_msg(-1006, " BGP peers");
if (p->bgp_hash.count == 0) if (p->bgp_hash.count == 0 || !snmp_is_active(p))
{ {
cli_msg(-1006, " <no peers available>"); cli_msg(-1006, " <no peers available>");
} }
@ -767,7 +769,7 @@ snmp_bgp4_show_info(struct snmp_proto *p)
cli_msg(-1006, " Protocol name: %s", peer->bgp_proto->p.name); cli_msg(-1006, " Protocol name: %s", peer->bgp_proto->p.name);
cli_msg(-1006, " Remote IPv4 address: %I4", peer->peer_ip); cli_msg(-1006, " Remote IPv4 address: %I4", peer->peer_ip);
cli_msg(-1006, " Remote router id %R", peer->bgp_proto->remote_id); cli_msg(-1006, " Remote router id %R", peer->bgp_proto->remote_id);
// TODO: add local ip addr /* TODO: add peer connection local ip */
} }
HASH_WALK_END; HASH_WALK_END;
} }

23
proto/snmp/config.Y
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@ -31,6 +31,7 @@ snmp_proto:
snmp_proto_item: snmp_proto_item:
proto_item proto_item
| bgp4_mib
| SOURCE ADDRESS ipa { SNMP_CFG->local_ip = $3; } | SOURCE ADDRESS ipa { SNMP_CFG->local_ip = $3; }
| AGENTX MASTER ADDRESS DEFAULT { | AGENTX MASTER ADDRESS DEFAULT {
if (SNMP_CFG->trans_type != SNMP_TRANS_DEFAULT) if (SNMP_CFG->trans_type != SNMP_TRANS_DEFAULT)
@ -47,15 +48,20 @@ snmp_proto_item:
} }
| AGENTX MASTER ADDRESS ipa { | AGENTX MASTER ADDRESS ipa {
if (SNMP_CFG->trans_type != SNMP_TRANS_DEFAULT) if (SNMP_CFG->trans_type != SNMP_TRANS_DEFAULT)
cf_error("Duplicit option remote address"); cf_error("Duplicit option agentx master address");
SNMP_CFG->master_ip = $4; SNMP_CFG->master_ip = $4;
SNMP_CFG->trans_type = SNMP_TRANS_TCP; SNMP_CFG->trans_type = SNMP_TRANS_TCP;
} }
| AGENTX MASTER PORT expr { | AGENTX MASTER ADDRESS ipa PORT expr {
/* TODO better grammar name (maybe: AX MSTR ADDRESS ipa / ADDRESS ipa [PORT] expr) */ if (SNMP_CFG->trans_type != SNMP_TRANS_DEFAULT)
if (($4 < 1) || ($4 > 65535)) cf_error("Invalid port number"); cf_error("Duplicit option agentx master address");
SNMP_CFG->master_port = $4;
if (($6 < 1) || ($6 > UINT16_MAX)) cf_error("Invalid port number");
SNMP_CFG->master_ip = $4;
SNMP_CFG->trans_type = SNMP_TRANS_TCP;
SNMP_CFG->master_port = $6;
} }
| SUBAGENT DESCRIPTION text { | SUBAGENT DESCRIPTION text {
if (strlen($3) > UINT16_MAX - 1) cf_error("Description is too long"); if (strlen($3) > UINT16_MAX - 1) cf_error("Description is too long");
@ -89,8 +95,8 @@ snmp_proto_item:
; ;
bgp4_mib: bgp4_mib:
BGP4 MIB '{' bgp4_mib_items '}' MIB BGP4 '{' bgp4_mib_items '}'
| MIB BGP4 '{' bgp4_mib_items '}' | BGP4 MIB '{' bgp4_mib_items '}'
; ;
bgp4_mib_items: bgp4_mib_items:
@ -136,7 +142,6 @@ bgp4_mib_peer: PEER symbol
snmp_proto_opts: snmp_proto_opts:
/* empty */ /* empty */
| snmp_proto_opts snmp_proto_item ';' | snmp_proto_opts snmp_proto_item ';'
| snmp_proto_opts bgp4_mib
; ;
snmp_proto_start: proto_start SNMP snmp_proto_start: proto_start SNMP
@ -151,8 +156,8 @@ snmp_proto_start: proto_start SNMP
SNMP_CFG->master_port = SNMP_PORT; SNMP_CFG->master_port = SNMP_PORT;
SNMP_CFG->master_path = agentx_master_addr; SNMP_CFG->master_path = agentx_master_addr;
SNMP_CFG->trans_type = SNMP_TRANS_DEFAULT; SNMP_CFG->trans_type = SNMP_TRANS_DEFAULT;
SNMP_CFG->bgp4_local_id = 0;
SNMP_CFG->bgp4_local_as = 0; SNMP_CFG->bgp4_local_as = 0;
SNMP_CFG->bgp4_local_id = 0;
SNMP_CFG->verbose = 0; SNMP_CFG->verbose = 0;
SNMP_CFG->description = "bird"; SNMP_CFG->description = "bird";

12
proto/snmp/snmp.c
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@ -11,10 +11,11 @@
* DOC: Simple Network Management Protocol * DOC: Simple Network Management Protocol
* *
* The SNMP protocol is divided into several parts: |snmp.c| which implements * The SNMP protocol is divided into several parts: |snmp.c| which implements
* the BIRD intergration, |subagent.c| contains functions for creating and * integration with BIRD core, |subagent.c| provides AgentX subagent behaviour
* parsing packets, |bgp4_mib.c| takes care of the bgp MIB subtree of standard * as well as functions for creating and parsing packets. In file |mib_tree.c|
* BGP4-MIB and |snmp_utils.c| which is collections of helper functions for * is implemented OID prefix tree for storing supported MIBs. File |bgp4_mib.c|
* working with OIDs, VarBinds. * implements parts of BGP4-MIB, |snmp_utils.c| is collection of helper
* functions for whole SNMP protocol.
* *
* Althrough called SNMP the BIRD does not implement SNMP directly but acts as * Althrough called SNMP the BIRD does not implement SNMP directly but acts as
* an AgentX subagent. AgentX subagent connects to AgentX master agent that * an AgentX subagent. AgentX subagent connects to AgentX master agent that
@ -40,6 +41,9 @@
* *
* *
* *
*/
/*
* SNMP State Machine * SNMP State Machine
* *
* States with main transitions * States with main transitions

4
proto/snmp/snmp_utils.c
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@ -390,8 +390,8 @@ snmp_put_fbyte(byte *buf, u8 data)
/** /**
* snmp_oid_compare - find the lexicographical order relation between @left and @right * snmp_oid_compare - find the lexicographical order relation between @left and @right
* @left: left object id relation operant * @left: left object id relation operand
* @right: right object id relation operant * @right: right object id relation operand
* *
* both @left and @right has to be non-blank. * both @left and @right has to be non-blank.
* function returns 0 if left == right, * function returns 0 if left == right,