<?xml version="1.0" encoding="iso-8859-1" ?> <!DOCTYPE erlref SYSTEM "erlref.dtd"> <erlref> <header> <copyright> <year>1996</year><year>2012</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> The contents of this file are subject to the Erlang Public License, Version 1.1, (the "License"); you may not use this file except in compliance with the License. You should have received a copy of the Erlang Public License along with this software. If not, it can be retrieved online at http://www.erlang.org/. Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. </legalnotice> <title>snmp</title> <prepared></prepared> <responsible></responsible> <docno></docno> <approved></approved> <checked></checked> <date></date> <rev></rev> <file>snmp.xml</file> </header> <module>snmp</module> <modulesummary>Interface functions to the SNMP toolkit</modulesummary> <description> <p>The module <c>snmp</c> contains interface functions to the SNMP toolkit.</p> </description> <section> <title>Common Data Types</title> <p>The following data-types are used in the functions below: </p> <list type="bulleted"> <item> <p><c>datetime() = {date(), time()}</c></p> <p>See <seealso marker="stdlib:calendar">calendar</seealso> for more info.</p> </item> </list> <marker id="config"></marker> </section> <funcs> <func> <name>config() -> ok | {error, Reason}</name> <fsummary>Configure with a simple interactive tool</fsummary> <desc> <p>A simple interactive configuration tool. Simple configuration files can be generated, but more complex configurations still have to be edited manually. </p> <p>The tool is a textual based tool that asks some questions and generates <c>sys.config</c> and <c>*.conf</c> files. </p> <p><em>Note</em> that if the application shall support version 3, then the crypto app must be started before running this function (password generation).</p> <p><em>Note</em> also that some of the configuration files for the agent and manager share the same names. This means that they have to be stored in <em>different</em> directories!</p> <marker id="start"></marker> </desc> </func> <func> <name>start() -> ok | {error, Reason}</name> <name>start(Type) -> ok | {error, Reason}</name> <fsummary>Start the SNMP application</fsummary> <type> <v>Type = start_type()</v> </type> <desc> <p>Starts the SNMP application.</p> <p>See <seealso marker="kernel:application">application</seealso> for more info.</p> <marker id="start_agent"></marker> </desc> </func> <func> <name>start_agent() -> ok | {error, Reason}</name> <name>start_agent(Type) -> ok | {error, Reason}</name> <fsummary>Start the agent part of the SNMP application</fsummary> <type> <v>Type = start_type()</v> </type> <desc> <p>The SNMP application consists of several entities, of which the agent is one. This function starts the agent entity of the application. </p> <p>Note that the only way to actually start the agent in this way is to add the agent related config after starting the application (e.g it cannot be part of the normal application config; sys.config). This is done by calling: <c>application:set_env(snmp, agent, Conf)</c>. </p> <p>The default value for <c>Type</c> is <c>normal</c>.</p> <marker id="start_manager"></marker> </desc> </func> <func> <name>start_manager() -> ok | {error, Reason}</name> <name>start_manager(Type) -> ok | {error, Reason}</name> <fsummary>Start the manager part of the SNMP application</fsummary> <type> <v>Type = start_type()</v> </type> <desc> <p>The SNMP application consists of several entities, of which the manager is one. This function starts the manager entity of the application. </p> <p>Note that the only way to actually start the manager in this way is to add the manager related config after starting the application (e.g it cannot be part of the normal application config; sys.config). This is done by calling: <c>application:set_env(snmp, manager, Conf)</c>. </p> <p>The default value for <c>Type</c> is <c>normal</c>.</p> <marker id="dat"></marker> </desc> </func> <func> <name>date_and_time() -> DateAndTime</name> <fsummary>Return the current date and time as an OCTET STRING</fsummary> <type> <v>DateAndTime = [int()]</v> </type> <desc> <p>Returns current date and time as the data type DateAndTime, as specified in RFC1903. This is an OCTET STRING.</p> <marker id="dat2ut_dst"></marker> </desc> </func> <func> <name>date_and_time_to_universal_time_dst(DateAndTime) -> [utc()]</name> <fsummary>Convert a DateAndTime value to a list of possible utc()</fsummary> <type> <v>DateAndTime = [int()]</v> <v>utc() = {{Y,Mo,D},{H,M,S}}</v> </type> <desc> <p>Converts a DateAndTime list to a list of possible universal time(s). The universal time value on the same format as defined in calendar(3). </p> <marker id="dat2s"></marker> </desc> </func> <func> <name>date_and_time_to_string(DateAndTime) -> string()</name> <name>date_and_time_to_string(DateAndTime, Validate) -> string()</name> <fsummary>Convert a DateAndTime value to a string</fsummary> <type> <v>DateAndTime = [int()]</v> <v>Validate = fun(Kind, Data) -> boolean()</v> </type> <desc> <p>Converts a DateAndTime list to a printable string, according to the DISPLAY-HINT definition in RFC2579.</p> <p>The validation fun, <c>Validate</c>, allows for a more "flexible" validation of the <c>DateAndTime</c> argument. Whenever the data is found to not follow RFC2579, the fun is called to allow a more "lax" validation. See the <seealso marker="#vdat">validate_date_and_time/2</seealso> function for more info on the <c>Validate</c> fun. </p> <marker id="dat2s2"></marker> </desc> </func> <func> <name>date_and_time_to_string2(DateAndTime) -> string()</name> <fsummary>Convert a DateAndTime value to a string</fsummary> <type> <v>DateAndTime = [int()]</v> </type> <desc> <p>Converts a DateAndTime list to a printable string, according to the DISPLAY-HINT definition in RFC2579, with the extension that it also allows the values "hours from UTC" = 14 together with "minutes from UTC" = 0. </p> <marker id="lt2dat_dst"></marker> </desc> </func> <func> <name>local_time_to_date_and_time_dst(Local) -> [DateAndTime]</name> <fsummary>Convert a Local time value to a list of possible DateAndTime(s)</fsummary> <type> <v>Local = {{Y,Mo,D},{H,M,S}}</v> <v>DateAndTime = [int()]</v> </type> <desc> <p>Converts a local time value to a list of possible DateAndTime list(s). The local time value on the same format as defined in calendar(3).</p> <marker id="ut2dat"></marker> </desc> </func> <func> <name>universal_time_to_date_and_time(UTC) -> DateAndTime</name> <fsummary>Convert a UTC value to DateAndTime</fsummary> <type> <v>UTC = {{Y,Mo,D},{H,M,S}}</v> <v>DateAndTime = [int()]</v> </type> <desc> <p>Converts a universal time value to a DateAndTime list. The universal time value on the same format as defined in calendar(3).</p> <marker id="vdat"></marker> </desc> </func> <func> <name>validate_date_and_time(DateAndTime) -> bool()</name> <name>validate_date_and_time(DateAndTime, Validate) -> bool()</name> <fsummary>Check if a DateAndTime value is correct</fsummary> <type> <v>DateAndTime = term()</v> <v>Validate = fun(Kind, Data) -> boolean()</v> </type> <desc> <p>Checks if <c>DateAndTime</c> is a correct DateAndTime value, as specified in RFC2579. This function can be used in instrumentation functions to validate a DateAndTime value.</p> <p>The validation fun, <c>Validate</c>, allows for a more "flexible" validation of the <c>DateAndTime</c> argument. Whenever the data is found to not follow RFC2579, the fun is called to allow a more "lax" validation. The input to the validation fun looks like this: </p> <pre> Kind Data -------------- ---------------------- year {Year1, Year2} month Month day Day hour Hour minute Minute seconds Seconds deci_seconds DeciSeconds diff [Sign, Hour, Minute] valid_date {Year, Month, Day} </pre> <marker id="passwd2localized_key"></marker> </desc> </func> <func> <name>passwd2localized_key(Alg, Passwd, EngineID) -> Key</name> <fsummary>Generates an localized key</fsummary> <type> <v>Alg = algorithm()</v> <v>algorithm() = md5 | sha</v> <v>Passwd = string()</v> <v>EngineID = string()</v> <v>Key = list()</v> </type> <desc> <p>Generates a key that can be used as an authentication or privacy key using MD5 och SHA. The key is localized for EngineID.</p> <marker id="octet_string_to_bits"></marker> </desc> </func> <func> <name>octet_string_to_bits(S) -> Val</name> <fsummary>Convert an OCTET-STRING to BITS</fsummary> <type> <v>Val = bits()</v> </type> <desc> <p>Utility function for converting a value of type <c>OCTET-STRING</c> to <c>BITS</c>. </p> <marker id="bits_to_octet_string"></marker> </desc> </func> <func> <name>bits_to_octet_string(B) -> Val</name> <fsummary>Convert an OCTET-STRING to BITS</fsummary> <type> <v>Val = octet_string()</v> </type> <desc> <p>Utility function for converting a value of type <c>BITS</c> to <c>OCTET-STRING</c>. </p> <marker id="read_mib"></marker> </desc> </func> <func> <name>read_mib(FileName) -> {ok, mib()} | {error, Reason}</name> <fsummary></fsummary> <type> <v>FileName = string()</v> <v>mib() = #mib{}</v> <v>Reason = term()</v> </type> <desc> <p>Read a compiled mib.</p> <marker id="log_to_txt"></marker> </desc> </func> <func> <name>log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile) -> ok | {error, Reason}</name> <name>log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Block | Start) -> ok | {error, Reason}</name> <name>log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Block | Stop) -> ok | {error, Reason}</name> <name>log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Stop, Block) -> ok | {error, Reason}</name> <fsummary>Convert an Audit Trail Log to text format</fsummary> <type> <v>LogDir = string()</v> <v>Mibs = [MibName]</v> <v>OutFile = string()</v> <v>MibName = string()</v> <v>LogName = string()</v> <v>LogFile = string()</v> <v>Start = Stop = null | datetime() | {local_time,datetime()} | {universal_time,datetime()} </v> <v>Block = boolean()</v> <v>Reason = term()</v> </type> <desc> <p>Converts an Audit Trail Log to a readable text file, where each item has a trailing TAB character, and any TAB character in the body of an item has been replaced by ESC TAB. </p> <p>The function can be used on a running system, or by copying the entire log directory and calling this function. SNMP must be running in order to provide MIB information. </p> <p><c>LogDir</c> is the name of the directory where the audit trail log is stored. <c>Mibs</c> is a list of Mibs to be used. The function uses the information in the Mibs to convert for example object identifiers to their symbolic name. <c>OutFile</c> is the name of the generated text-file. <c>LogName</c> is the name of the log, <c>LogFile</c> is the name of the log file. <c>Start</c> is the start (first) date and time from which log events will be converted and <c>Stop</c> is the stop (last) date and time to which log events will be converted. The <c>Block</c> argument indicates if the log should be blocked during conversion. This could be usefull when converting large logs (when otherwise the log could wrap during conversion). Defaults to <c>true</c>. </p> <p>The format of an audit trail log text item is as follows: </p> <p><c>Tag Addr - Community [TimeStamp] Vsn</c><br></br> <c>PDU</c></p> <p>where <c>Tag</c> is <c>request</c>, <c>response</c>, <c>report</c>, <c>trap</c> or <c>inform</c>; Addr is <c>IP:Port</c> (or comma space separated list of such); <c>Community</c> is the community parameter (SNMP version v1 and v2), or <c>SecLevel:"AuthEngineID":"UserName"</c> (SNMP v3); <c>TimeStamp</c> is a date and time stamp, and <c>Vsn</c> is the SNMP version. <c>PDU</c> is a textual version of the protocol data unit. There is a new line between <c>Vsn</c> and <c>PDU</c>.</p> <marker id="log_to_io"></marker> </desc> </func> <func> <name>log_to_io(LogDir, Mibs, LogName, LogFile) -> ok | {error, Reason}</name> <name>log_to_io(LogDir, Mibs, LogName, LogFile, Block | Start) -> ok | {error, Reason}</name> <name>log_to_io(LogDir, Mibs, LogName, LogFile, Start, Block | Stop) -> ok | {error, Reason}</name> <name>log_to_io(LogDir, Mibs, LogName, LogFile, Start, Stop, Block) -> ok | {error, Reason}</name> <fsummary>Convert an Audit Trail Log to text format</fsummary> <type> <v>LogDir = string()</v> <v>Mibs = [MibName]</v> <v>MibName = string()</v> <v>LogName = string()</v> <v>LogFile = string()</v> <v>Start = Stop = null | datetime() | {local_time,datetime()} | {universal_time,datetime()} </v> <v>Reason = term()</v> </type> <desc> <p>Converts an Audit Trail Log to a readable format and prints it on stdio. See <seealso marker="snmp#log_to_txt">log_to_txt</seealso> above for more info.</p> <marker id="change_log_size"></marker> </desc> </func> <func> <name>change_log_size(LogName, NewSize) -> ok | {error, Reason}</name> <fsummary>Change the size of the Audit Trail Log</fsummary> <type> <v>LogName = string()</v> <v>NewSize = {MaxBytes, MaxFiles}</v> <v>MaxBytes = integer()</v> <v>MaxFiles = integer()</v> <v>Reason = term()</v> </type> <desc> <p>Changes the log size of the Audit Trail Log. The application must be configured to use the audit trail log function. Please refer to disk_log(3) in Kernel Reference Manual for a description of how to change the log size. </p> <p>The change is permanent, as long as the log is not deleted. That means, the log size is remembered across reboots.</p> <marker id="print_version_info"></marker> </desc> </func> <func> <name>print_version_info() -> void()</name> <name>print_version_info(Prefix) -> void()</name> <fsummary>Formatted print of result of the versions functions</fsummary> <type> <v>Prefix = string() | integer()</v> </type> <desc> <p>Utility function(s) to produce a formatted printout of the versions info generated by the <c>versions1</c> function</p> <p>This is the same as doing, e.g.: </p> <pre> {ok, V} = snmp:versions1(), snmp:print_versions(V). </pre> <marker id="versions1"></marker> <marker id="versions2"></marker> </desc> </func> <func> <name>versions1() -> {ok, Info} | {error, Reason}</name> <name>versions2() -> {ok, Info} | {error, Reason}</name> <fsummary>Retrieve various system and application info</fsummary> <type> <v>Info = [info()]</v> <v>info() = term()</v> <v>Reason = term()</v> </type> <desc> <p>Utility functions used to retrieve some system and application info.</p> <p>The difference between the two functions is in how they get the modules to check. <c>versions1</c> uses the app-file and <c>versions2</c> uses the function <c>application:get_key</c>.</p> <marker id="print_versions"></marker> </desc> </func> <func> <name>print_versions(VersionInfo) -> void()</name> <name>print_versions(Prefix, VersionInfo) -> void()</name> <fsummary>Formatted print of result of the versions functions</fsummary> <type> <v>VersionInfo = [version_info()]</v> <v>version_info() = term()</v> <v>Prefix = string() | integer()</v> </type> <desc> <p>Utility function to produce a formatted printout of the versions info generated by the <c>versions1</c> and <c>versions2</c> functions</p> <p>Example: </p> <pre> {ok, V} = snmp:versions1(), snmp:print_versions(V). </pre> <marker id="enable_trace"></marker> </desc> </func> <func> <name>enable_trace() -> void()</name> <fsummary>Starts a tracer</fsummary> <!-- <type> <v>Prefix = string() | integer()</v> </type> --> <desc> <p>Starts a dbg tracer that prints trace events to stdout (using plain io:format after a minor formatting). </p> <marker id="disable_trace"></marker> </desc> </func> <func> <name>disable_trace() -> void()</name> <fsummary>Stop the tracer</fsummary> <!-- <type> <v>Prefix = string() | integer()</v> </type> --> <desc> <p>Stop the tracer. </p> <marker id="set_trace1"></marker> </desc> </func> <func> <name>set_trace(Targets) -> void()</name> <fsummary>Set trace target</fsummary> <type> <v>Targets = target() | targets()</v> <v>target() = module()</v> <v>module() = atom()</v> <v>targets() = [target() | {target(), target_options()}]</v> <v>target_options() = [target_option()]</v> <v>target_option() = {return_trace, boolean()} | {scope, scope()}</v> <v>scope() = all_functions | exported_functions | function_name() | {function_name(), function_arity()}</v> <v>function_name() = atom()</v> <v>function_arity() = integer() >= 0</v> </type> <desc> <p>This function is used to set up default trace on function(s) for the given module or modules. The scope of the trace will be all <em>exported</em> functions (both the call info and the return value). Timestamp info will also be included. </p> <marker id="reset_trace"></marker> </desc> </func> <func> <name>reset_trace(Targets) -> void()</name> <fsummary>Reset trace target</fsummary> <type> <v>Targets = module() | modules()</v> <v>modules() = [module()]</v> <v>module() = atom()</v> </type> <desc> <p>This function is used to reset (disable) trace for the given module(s). </p> <marker id="set_trace2"></marker> </desc> </func> <func> <name>set_trace(Targets, Opts) -> void()</name> <fsummary>Set trace target</fsummary> <type> <v>Targets = target() | targets()</v> <v>target() = module()</v> <v>module() = atom()</v> <v>targets() = [target() | {target(), target_options()}]</v> <v>target_options() = [target_option()]</v> <v>target_option() = {return_trace, boolean()} | {scope, scope()}</v> <v>scope() = all_functions | exported_functions | function_name() | {function_name(), function_arity()}</v> <v>function_name() = atom()</v> <v>function_arity() = integer() >= 0</v> <v>Opts = disable | trace_options()</v> <v>trace_options() = [trace_option()]</v> <v>trace_option() = {timestamp, boolean()} | target_option()</v> </type> <desc> <p>This function is used to set up trace on function(s) for the given module or modules. </p> <p>The example below sets up trace on the exported functions (default) of module <c>snmp_generic</c> and all functions of module <c>snmp_generic_mnesia</c>. With return values (which is default) and timestamps in both cases (which is also default): </p> <pre> snmp:enable_trace(), snmp:set_trace([snmp_generic, {snmp_generic_mnesia, [{scope, all_functions}]}]), . . . snmp:set_trace(snmp_generic, disable), . . . snmp:disable_trace(), </pre> </desc> </func> </funcs> <section> <title>See Also</title> <p>calendar(3) </p> </section> </erlref>