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Simple Network Management Protocol (SNMP)
Release Notes
Version 4.25

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# 1 SNMP Release Notes

### 1.1 SNMP Development Toolkit 4.25

Version 4.25 supports code replacement in runtime from/to version 4.24.2, 4.24.1, 4.24, 4.23.1 and 4.23.

#### Improvements and new features

- [agent] Enable SNMP to create missing database directories.

  Add {db_init_error, create_db_and_dir} option to SNMP manager and agent. This allows them to create any missing parent directories for db_dir, rather than treating any missing directories as a fatal error. The default for db_init_error, which is terminate, is unchanged.

  Steve Vinoski

  Own Id: OTP-11352

- [manager] Improved handling of unexpected return values from snmpm_user callback functions.

  Violations of the documented API (crashes or invalid return values) will now result in an error message.

  Own Id: OTP-11307

- Add (atl) log conversion block option.

  It is now possible to request that the Audit Trail Log should be blocked during conversion (log_to_txt or log_to_io). This could be usefull when coverting an entire large log (when there is a chance it may otherwise wrap during conversion).

  See agent log_to_txt and log_to_io and also manager log_to_txt and log_to_io for details.

  Own Id: OTP-11396

  Own Id: seq12433

- When converting an Audit Trail Log to text, a corrupt log entry could cause the entire conversion to fail.

  Also, for a log with sequence numbers, failing to decode a log entry would cause the conversion to fail (not because of the failed decode, but because of the failure to write the error message).

  Own Id: OTP-111453

  Aux Id: Seq 12459

#### Fixed Bugs and Malfunctions

- Wrong block cypher type used for AES ('aes_cbf128' instead of 'aes_cfb128') when performing AES block encrypt/decrypt which breaks SNMP usmAesCfb128Protocol in agent and manager.

  Own Id: OTP-11412

- [manager] When performing the AES encryption, invalid values for the EngineBoots and EngineTime was used.

  The values of the local agent was used, which would have produced "some" values if an agent was actually running. If not it would have caused a crash.

  Own Id: OTP-11413

#### Incompatibilities

-

### 1.2 SNMP Development Toolkit 4.24.2

Version 4.24.2 supports code replacement in runtime from/to version 4.24.1, 4.24, 4.23.1 and 4.23.

#### Improvements and new features

- [agent] Improved documentation for the functions for loading and unloading mibs, see load_mibs and unload_mibs for more info.

  Also added new functions for loading and unloading a single mib, see load_mib and unload_mib for more info.

  Own Id: OTP-11216

#### Fixed Bugs and Malfunctions

-

#### Incompatibilities

-

### 1.3 SNMP Development Toolkit 4.24.1

Version 4.24.1 supports code replacement in runtime from/to version 4.24, 4.23.1 and 4.23.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- [agent] Reading the value of the vacmViewTreeFamilyMask returns it in the wrong (internal bitlist) format.

  The vacmViewTreeFamilyMask is defined as a bit string in the MIB (OCTET STRING). Internally a bitlist (list of 1's and 0's, see vacm config file for more info) is used. However, the MIB implementation assumed the latter, effectively rendering all attempts to read/set masks via SNMP unsuccessful.

  Since the mask is used in hot paths (e.g. access permission checks for each SNMP operation, the bitlist representation of the mask has benefits (e.g. faster processing). Reading/writing the view mask objects is less time-critical. Therefore, to fix the issue, convert between the bitlist (internal) representation and bitstring (external) when the vacmViewTreeFamilyMask objects are accessed.

  Also, the check of the vacm config file was invalid with regard to the mask value. It was assumed to be a proper oid, which is not strictly the case (see bitlist above).

  Own Id: OTP-11177

  Stefan Zegenhagen

- [agent] The counter increment function in the local-db was incorrect. It did not handle counter wrap correctly.

  Own Id: OTP-11192

#### Incompatibilities

-

### 1.4 SNMP Development Toolkit 4.24

Version 4.24 supports code replacement in runtime from/to version 4.23.1 and 4.23.

#### Improvements and new features

- [agent,manager] Updated to support the new crypto interface.

  Own Id: OTP-11009

- [agent] Introduced a documented behaviour for the mib-server mib-data backend. At present only the default module (snmpa_mib_data_tttn) is provided.

  A config option for the (agent) mib-servers mib-data backend module has been added to the agent config options, data_module.

  Own Id: OTP-11101

- [agent] Introduced a documented behaviour for the mib storage. At present there are three simple modules (snmpa_mib_storage_ets, snmpa_mib_storage_dets and snmpa_mib_storage_mnesia) implementing this behaviour, provided with the app.

  A config option for the (agent) mib storage has been added to the agent config options.

  Own Id: OTP-11107

#### Fixed Bugs and Malfunctions

-

#### Incompatibilities

-

### 1.5 SNMP Development Toolkit 4.23.1

Version 4.23.1 supports code replacement in runtime from/to version 4.23.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- [compiler] Now handles MIBs importing the pesudotype BITS.

  Own Id: OTP-10799

- [compiler] The MIB compiler could not handle a table index that was defined later in the MIB.

  Own Id: OTP-10808

#### Incompatibilities

-

### 1.6 SNMP Development Toolkit 4.23

#### Improvements and new features

- [manager] Polish return values of snmpm_user_default according to snmpm_user doc.

  Luca Favatella

  Own Id: OTP-10671

- [agent] Remove runtime warning in snmpa_agent because of tuple fun usage.

  Luca Favatella

  Own Id: OTP-10672

- [manager] SNMP manager performance optimization.

  Ivan Dubovik

  Own Id: OTP-10673

#### Fixed Bugs and Malfunctions

-

#### Incompatibilities

- [manager] The old Addr-and-Port based API functions, previously long deprecated and marked for deletion in R16B, has now been removed.

  Own Id: OTP-10027

### 1.7 SNMP Development Toolkit 4.22.1

Version 4.22.1 supports code replacement in runtime from/to version 4.22, 4.21.7 4.21.6 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1 and 4.21.

#### Improvements and new features

- [agent] Sematic fixes to SNMP-USER-BASED-SM-MIB. The semantics allow the usmUserAuthKeyChange and usmUserPrivKeyChange objects to be written to in the same set requests that also creates and clones the user. This was not possible beforehand, causing test tools checking semantic SNMPv3 behaviour to fail on a lot of test cases.

  Furthermore, once the user has been cloned by writing to an instance of usmUserCloneFrom, further set-operations to the same object will not return an error, but be no-ops. Especially, it must be avoided to copy security parameters again (possibly even from a different user).

  Stefan Zegenhagen

  Own Id: OTP-10166

- [agent] Errors in vacmAccessTable RowStatus handling. There are problems with the handling of vacmAccessTableStatus that cause some SNMP test suites to report errors. Most notably, erroneous set operations frequently cause "genErr" errors to be returned. These "genErr" errors are usually caused by badmatch exceptions coming from {ok, Row} = snmpa_vacm:get_row(RowIndex) if the row does not exist.

  The semantics of the RowStatus handling in that table has been adjusted to be compliant with the RowStatus textual description of SNPMv2-TC MIB.

  Stefan Zegenhagen

  Own Id: OTP-10164

#### Fixed Bugs and Malfunctions

- [agent] Fix walk over vacmAccessTable. Fix the get_next implementation of vacmAccessTable to return all table entries.

  The get_next implementation of vacmAccessTable did not return all available table data. Instead, it only returned the first column for each row, and all columns for the last row available.

  Stefan Zegenhagen

  Own Id: OTP-10165

- [manager] snmpm:log_to_io/6 did not use the LogName argument.

  Own Id: OTP-10066

- Incorrect TimeTicks decode. Also bad handling of invalid encode (value outside of value range) for both TimeTicks and Unsigned32.

  Own Id: OTP-10132

#### Incompatibilities

-

### 1.8 SNMP Development Toolkit 4.22

Version 4.22 supports code replacement in runtime from/to version 4.21.7 4.21.6 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1 and 4.21.

#### Improvements and new features

- [compiler] The table information the MIB compiler provides with augmented tables has been extended with nbr_of_cols, first_accessible and not_accessible.

  Own Id: OTP-9969

- Added the log_to_io audit-trail-log converter function to the api modules of both the manager and agent.

  Own Id: OTP-9940

- [manager] Introduced a new transport module, snmpm_net_if_mt, which handles all incomming and outgoing traffic in newly created processes. The message/request is processed and then the process exits.

  Own Id: OTP-9876

- [agent] Documenting previously existing but undocumented function, snmp_generic:get_table_info/2.

  Own Id: OTP-9942

- [agent] Improve error handling while reading agent config files. Some files contain mandatory information and is therefor themself mandatory.

  Own Id: OTP-9943

#### Fixed Bugs and Malfunctions

-

#### Incompatibilities

-

### 1.9 SNMP Development Toolkit 4.21.7

Version 4.21.7 supports code replacement in runtime from/to version 4.21.6, 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 4.20.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- [agent] Simultaneous snmpa:backup/1,2 calls can interfere. The master agent did not check if a backup was already in progress when a backup request was accepted.

  Own Id: OTP-9884

  Aux Id: Seq 11995

#### Incompatibilities

-

### 1.10 SNMP Development Toolkit 4.21.6

Version 4.21.6 supports code replacement in runtime from/to version 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 4.20.

#### Improvements and new features

- [agent] DoS attack using GET-BULK with large value of MaxRepetitions. A preventive method has been implementing by simply limit the number of varbinds that can be included in a Get-BULK response message. This is specified by the new config option, gb_max_vbs.

  Own Id: OTP-9700

#### Fixed Bugs and Malfunctions

- [agent] Mib server cache gclimit update function incorrectly calls age update function. The gclimit update function, update_mibs_cache_gclimit/1, incorrectly called the age update function, update_mibs_cache_age/2.

  Johan Claesson

  Own Id: OTP-9868

#### Incompatibilities

-

### 1.11 SNMP Development Toolkit 4.21.5

Version 4.21.5 supports code replacement in runtime from/to version 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 4.20.

#### Improvements and new features

- [agent] Removed (more) use of old style tuple funs.

  Own Id: OTP-9783

#### Fixed Bugs and Malfunctions

- [agent] Repeated vacm table dumping fails due to file name conflict. When dumping the vacm table to disk, a temoporary file with a fixed name was used. If the table dumping (snmpa_vacm:dump_table/0) was initiated from several different processes in rapid succesion, the dumping could fail because the different processes was simultaniously trying to write to the same file. This problem has been eliminated by creating a unique name for the temporary file.

  Own Id: OTP-9851

  Aux Id: Seq 11980

#### Incompatibilities

-

### 1.12 SNMP Development Toolkit 4.21.4

This version has never been released for R14B.

Version 4.21.4 supports code replacement in runtime from/to version 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1, 4.20 and 4.19.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- [agent] Removed use of old style tuple funs.

  Own Id: OTP-9779

#### Incompatibilities

-

### 1.13 SNMP Development Toolkit 4.21.3

Version 4.21.3 supports code replacement in runtime from/to version 4.21.2, 4.21.1, 4.21, 4.20.1, 4.20 and 4.19.

#### Improvements and new features

- [compiler] Improved version info printout from the MIB compiler frontend escript.

  Own Id: OTP-9618

#### Fixed Bugs and Malfunctions

- [agent] Version 4.20 introduced a change that broke trap sending from subagents. Due to a bug in the test code, this was not discovered, until that bug was fixed.

  Own Id: OTP-9745

- [agent] When sending an error message (reply) regarding snmpUnknownPDUHandlers, the agent used the wrong OID.

  Own Id: OTP-9747

- [compiler] Fix the --warnings/--W option parsing in the snmpc wrapper (e)script. The short warning option was incorrectly --w, instead of as documented --W. This has now been corrected.

  *** POTENTIAL INCOMPATIBILITY ***

  Tuncer Ayaz

  Own Id: OTP-9718

#### Incompatibilities

- [compiler] The short warning option has been changed from --w to --W to comply with the documentation.

  Tuncer Ayaz

  Own Id: OTP-9718

### 1.14 SNMP Development Toolkit 4.21.2

Version 4.21.2 supports code replacement in runtime from/to version 4.21.1, 4.21, 4.20.1, 4.20 and 4.19.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- Bad note store GC timer deactivation. Wrong field in the state record was set (timeout instead active).

  Stefan Grundmann

  Own Id: OTP-9690

#### Incompatibilities

-

### 1.15 SNMP Development Toolkit 4.21.1

Version 4.21.1 supports code replacement in runtime from/to version 4.20.1, 4.20 and 4.19.

#### Improvements and new features

- [compiler] Used wrong variable name (for warnings-as-errors variable), which caused the compiler to crash when using the snmpc (e)script.

  Also added the option --Werror for the SNMP MIB compiler (escript) frontend (to mimic erlc), which specifies whether warnings should be treated as errors.

  Own Id: OTP-9447

- [agent] Some very minor debugging improvements.

  Own Id: OTP-9446

#### Fixed Bugs and Malfunctions

-

#### Incompatibilities

-

### 1.16 SNMP Development Toolkit 4.21

Version 4.21 supports code replacement in runtime from/to version 4.20.1, 4.20 and 4.19.

#### Improvements and new features

- [manager] There was no way to specify transport domain. The transport domains was assumed to be IPv4 (transportDomainUdpIpv4). This has now been changed so that it can also be IPv6 (transportDomainUdpIpv6). To facilitate this, the transport domain, tdomain, is now a (new) valid option when registering a new agent (and updating agent info).

  This also mean that the transport behaviour has changed.

  Own Id: OTP-9305

  Aux Id: Seq 11847

- [compiler] Added the option warnings_as_errors (for the SNMP MIB compiler (escript) frontend, the option --wae is used) which specifies whether warnings should be treated as errors.

  Tuncer Ayaz

  Own Id: OTP-9437

#### Fixed Bugs and Malfunctions

- The snmp config tool could not handle (manager) audit trail config because the option seqno was not handled.

  Own Id: OTP-9354

- [agent] The SNMP ACM cache was not properly updated when changes where made to the VACM security-to-group, access and view-tree-family tables.

  Own Id: OTP-9367

  Aux Id: Seq 11858

- Fixed install directory typo for man3.

  Peter Lemenkov

  Hans Ulrich Niedermann

  Own Id: OTP-9442

#### Incompatibilities

-

### 1.17 SNMP Development Toolkit 4.20.1

Version 4.20.1 supports code replacement in runtime from/to version 4.20, 4.19 and 4.18.

#### Improvements and new features

-

#### Fixed Bugs and Malfunctions

- [agent] Did not handle transport domains properly in some cases, for instance trap sending.

  Own Id: OTP-9400

- [agent] Wrong default transport domain, snmpUDPDomain, instead of transportDomainUdpIpv4.

  Own Id: OTP-9425

  Aux Id: Seq 11874

#### Incompatibilities

-

### 1.18 SNMP Development Toolkit 4.20

Version 4.20 supports code replacement in runtime from/to version 4.19 and 4.18.

#### Improvements and new features

- [agent] Added support for sending traps to IPv6 targets.

  See the target address config file, the target_addr_entry/11 function or add_addr/11 for more info.

  Own Id: OTP-9088

  Aux Id: Seq 11790

- [agent] To be able to handle multiple engine-id(s) when sending trap(s), the function add_community/6 has been added.

  Own Id: OTP-9119

  Aux Id: Seq 11792

- [manager] The API for snmp requests has been augmented to allow the caller to override some configuration.

  This has been done by introducing a new set of API functions, see sync_get2/3,4, async_get2/3,4, sync_get_next2/3,4, async_get_next2/3,4, sync_get_bulk2/5,6, async_get_bulk2/5,6, sync_set2/3,4 and async_set2/3,4 for more info.

  Own Id: OTP-9162

- [manager] The old API functions (for get and set requests: snmpm:g/3,4,5,6,7, snmpm:ag/3,4,5,6,7, snmpm:gn/3,4,5,6,7, snmpm:agn/3,4,5,6,7, snmpm:s/3,4,5,6,7, snmpm:s/3,4,5,6,7, snmpm:gb/5,6,7,8,9 and snmpm:agb/5,6,7,8,9) are now officially deprecated. They will be removed as of R16B.

  Own Id: OTP-9174

- [agent] Pass extra info through the agent to the net-if process when sending notifications.

  See snmpa:send_notification2/3 for more info. See also the incomming net-if messages when sending a trap (send_pdu message) and notification (send_pdu_req message).

  Own Id: OTP-9183

  Aux Id: Seq 11817

- Added type specs for functions that do not return.

  Kostis Sagonas

  Own Id: OTP-9208

#### Fixed Bugs and Malfunctions

- Fixed endode/decode of values of type Counter32.

  This type (Counter32) is an unsigned integer 32, but is actually encoded as an signed integer 32. The encode/decode functions however, treated it as if it was encodeded as an unsigned integer 32.

  Own Id: OTP-9022

#### Incompatibilities

-