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NAME
snmp - Interface functions to the SNMP toolkit
DESCRIPTION
The module snmp contains interface functions to the SNMP toolkit.
COMMON DATA TYPES
The following data-types are used in the functions below:
* datetime() = {date(), time()}
See calendar for more info.
EXPORTS
config() -> ok | {error, Reason}
A simple interactive configuration tool. Simple configuration files can be
generated, but more complex configurations still have to be edited manually.
The tool is a textual based tool that asks some questions and generates sys.config
and *.conf files.
Note that if the application shall support version 3, then the crypto app must be
started before running this function (password generation).
Note 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 different directories!
start() -> ok | {error, Reason}
start(Type) -> ok | {error, Reason}
Types:
Type = start_type()
Starts the SNMP application.
See application for more info.
start_agent() -> ok | {error, Reason}
start_agent(Type) -> ok | {error, Reason}
Types:
Type = start_type()
The SNMP application consists of several entities, of which the agent is one. This
function starts the agent entity of the application.
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: application:set_env(snmp,
agent, Conf).
The default value for Type is normal.
start_manager() -> ok | {error, Reason}
start_manager(Type) -> ok | {error, Reason}
Types:
Type = start_type()
The SNMP application consists of several entities, of which the manager is one.
This function starts the manager entity of the application.
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:
application:set_env(snmp, manager, Conf).
The default value for Type is normal.
date_and_time() -> DateAndTime
Types:
DateAndTime = [int()]
Returns current date and time as the data type DateAndTime, as specified in
RFC1903. This is an OCTET STRING.
date_and_time_to_universal_time_dst(DateAndTime) -> [utc()]
Types:
DateAndTime = [int()]
utc() = {{Y,Mo,D},{H,M,S}}
Converts a DateAndTime list to a list of possible universal time(s). The universal
time value on the same format as defined in calendar(3erl).
date_and_time_to_string(DateAndTime) -> string()
date_and_time_to_string(DateAndTime, Validate) -> string()
Types:
DateAndTime = [int()]
Validate = fun(Kind, Data) -> boolean()
Converts a DateAndTime list to a printable string, according to the DISPLAY-HINT
definition in RFC2579.
The validation fun, Validate, allows for a more "flexible" validation of the
DateAndTime argument. Whenever the data is found to not follow RFC2579, the fun is
called to allow a more "lax" validation. See the validate_date_and_time/2 function
for more info on the Validate fun.
date_and_time_to_string2(DateAndTime) -> string()
Types:
DateAndTime = [int()]
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.
local_time_to_date_and_time_dst(Local) -> [DateAndTime]
Types:
Local = {{Y,Mo,D},{H,M,S}}
DateAndTime = [int()]
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(3erl).
universal_time_to_date_and_time(UTC) -> DateAndTime
Types:
UTC = {{Y,Mo,D},{H,M,S}}
DateAndTime = [int()]
Converts a universal time value to a DateAndTime list. The universal time value on
the same format as defined in calendar(3erl).
validate_date_and_time(DateAndTime) -> bool()
validate_date_and_time(DateAndTime, Validate) -> bool()
Types:
DateAndTime = term()
Validate = fun(Kind, Data) -> boolean()
Checks if DateAndTime is a correct DateAndTime value, as specified in RFC2579. This
function can be used in instrumentation functions to validate a DateAndTime value.
The validation fun, Validate, allows for a more "flexible" validation of the
DateAndTime 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:
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}
passwd2localized_key(Alg, Passwd, EngineID) -> Key
Types:
Alg = algorithm()
algorithm() = md5 | sha | sha224 | sha256 | sha384 | sha512
Passwd = string()
EngineID = string()
Key = list()
Generates a key that can be used as an authentication or privacy key using MD5,
SHA, SHA224, SHA256, SHA384 or SHA512. The key is localized for EngineID.
octet_string_to_bits(S) -> Val
Types:
Val = bits()
Utility function for converting a value of type OCTET-STRING to BITS.
bits_to_octet_string(B) -> Val
Types:
Val = octet_string()
Utility function for converting a value of type BITS to OCTET-STRING.
read_mib(FileName) -> {ok, mib()} | {error, Reason}
Types:
FileName = string()
mib() = #mib{}
Reason = term()
Read a compiled mib.
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile) -> ok | {ok, Cnt} | {error, Reason}
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Block | Start) -> ok | {ok, Cnt} |
{error, Reason}
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Block | Stop) -> ok | {ok, Cnt}
| {error, Reason}
log_to_txt(LogDir, Mibs, OutFile, LogName, LogFile, Start, Stop, Block) -> ok | {ok, Cnt}
| {error, Reason}
Types:
LogDir = string()
Mibs = [MibName]
OutFile = string()
MibName = string()
LogName = string()
LogFile = string()
Start = Stop = null | datetime() | {local_time,datetime()} |
{universal_time,datetime()}
Block = boolean()
Cnt = {NumOK, NumERR}
NumOK = non_neg_integer()
NumERR = pos_integer()
Reason = term()
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.
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.
LogDir is the name of the directory where the audit trail log is stored. Mibs 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. OutFile is the name of the
generated text-file. LogName is the name of the log, LogFile is the name of the log
file. Start is the start (first) date and time from which log events will be
converted and Stop is the stop (last) date and time to which log events will be
converted. The Block 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 true.
The format of an audit trail log text item is as follows:
Tag Addr - Community [TimeStamp] Vsn
PDU
where Tag is request, response, report, trap or inform; Addr is IP:Port (or comma
space separated list of such); Community is the community parameter (SNMP version
v1 and v2), or SecLevel:"AuthEngineID":"UserName" (SNMP v3); TimeStamp is a date
and time stamp, and Vsn is the SNMP version. PDU is a textual version of the
protocol data unit. There is a new line between Vsn and PDU.
If the entire log is successfully converted, the function will return ok. If one of
more entries fail to convert, the function will instead return {ok, {NumOK,
NumERR}}, where the counters indicate how many valid and erroneous entries where
found. If instead {error, Reason} is returned, the conversion encountered a fatal
error and where either never done of aborted midway.
log_to_io(LogDir, Mibs, LogName, LogFile) -> ok | {ok, Cnt} | {error, Reason}
log_to_io(LogDir, Mibs, LogName, LogFile, Block | Start) -> ok | {ok, Cnt} | {error,
Reason}
log_to_io(LogDir, Mibs, LogName, LogFile, Start, Block | Stop) -> ok | {ok, Cnt} | {error,
Reason}
log_to_io(LogDir, Mibs, LogName, LogFile, Start, Stop, Block) -> ok | {ok, Cnt} | {error,
Reason}
Types:
LogDir = string()
Mibs = [MibName]
MibName = string()
LogName = string()
LogFile = string()
Start = Stop = null | datetime() | {local_time,datetime()} |
{universal_time,datetime()}
Cnt = {NumOK, NumERR}
NumOK = non_neg_integer()
NumERR = pos_integer()
Reason = term()
Converts an Audit Trail Log to a readable format and prints it on stdio. See
log_to_txt above for more info.
change_log_size(LogName, NewSize) -> ok | {error, Reason}
Types:
LogName = string()
NewSize = {MaxBytes, MaxFiles}
MaxBytes = integer()
MaxFiles = integer()
Reason = term()
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(3erl) in Kernel
Reference Manual for a description of how to change the log size.
The change is permanent, as long as the log is not deleted. That means, the log
size is remembered across reboots.
print_version_info() -> void()
print_version_info(Prefix) -> void()
Types:
Prefix = string() | integer()
Utility function(s) to produce a formatted printout of the versions info generated
by the versions1 function
This is the same as doing, e.g.:
{ok, V} = snmp:versions1(),
snmp:print_versions(V).
versions1() -> {ok, Info} | {error, Reason}
versions2() -> {ok, Info} | {error, Reason}
Types:
Info = [info()]
info() = term()
Reason = term()
Utility functions used to retrieve some system and application info.
The difference between the two functions is in how they get the modules to check.
versions1 uses the app-file and versions2 uses the function application:get_key.
print_versions(VersionInfo) -> void()
print_versions(Prefix, VersionInfo) -> void()
Types:
VersionInfo = [version_info()]
version_info() = term()
Prefix = string() | integer()
Utility function to produce a formatted printout of the versions info generated by
the versions1 and versions2 functions
Example:
{ok, V} = snmp:versions1(),
snmp:print_versions(V).
enable_trace() -> void()
Starts a dbg tracer that prints trace events to stdout (using plain io:format after
a minor formatting).
disable_trace() -> void()
Stop the tracer.
set_trace(Targets) -> void()
Types:
Targets = target() | targets()
target() = module()
module() = atom()
targets() = [target() | {target(), target_options()}]
target_options() = [target_option()]
target_option() = {return_trace, boolean()} | {scope, scope()}
scope() = all_functions | exported_functions | function_name() |
{function_name(), function_arity()}
function_name() = atom()
function_arity() = integer() >= 0
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 exported functions (both the call
info and the return value). Timestamp info will also be included.
reset_trace(Targets) -> void()
Types:
Targets = module() | modules()
modules() = [module()]
module() = atom()
This function is used to reset (disable) trace for the given module(s).
set_trace(Targets, Opts) -> void()
Types:
Targets = target() | targets()
target() = module()
module() = atom()
targets() = [target() | {target(), target_options()}]
target_options() = [target_option()]
target_option() = {return_trace, boolean()} | {scope, scope()}
scope() = all_functions | exported_functions | function_name() |
{function_name(), function_arity()}
function_name() = atom()
function_arity() = integer() >= 0
Opts = disable | trace_options()
trace_options() = [trace_option()]
trace_option() = {timestamp, boolean()} | target_option()
This function is used to set up trace on function(s) for the given module or
modules.
The example below sets up trace on the exported functions (default) of module
snmp_generic and all functions of module snmp_generic_mnesia. With return values
(which is default) and timestamps in both cases (which is also default):
snmp:enable_trace(),
snmp:set_trace([snmp_generic,
{snmp_generic_mnesia, [{scope, all_functions}]}]),
.
.
.
snmp:set_trace(snmp_generic, disable),
.
.
.
snmp:disable_trace(),
SEE ALSO
calendar(3erl)