snmp2_set

    (PHP >= 5.2.0, PHP 7, PHP 8)

    snmp2_set — Set the value of an SNMP object

    Description

    snmp2_set(
        string $hostname,
        string $community,
        array|string $object_id,
        array|string $type,
        array|string $value,
        int $timeout = -1,
        int $retries = -1
    ): bool

    snmp2_set() is used to set the value of an SNMP object specified by the object_id.

    Parameters

    hostname

    The hostname of the SNMP agent (server).

    community

    The write community.

    object_id

    The SNMP object id.

    type

    The MIB defines the type of each object id. It has to be specified as a single character from the below list.

    types
    =The type is taken from the MIB
    iINTEGER
    uINTEGER
    sSTRING
    xHEX STRING
    dDECIMAL STRING
    nNULLOBJ
    oOBJID
    tTIMETICKS
    aIPADDRESS
    bBITS

    If OPAQUE_SPECIAL_TYPES was defined while compiling the SNMP library, the following are also valid:

    types
    Uunsigned int64
    Isigned int64
    Ffloat
    Ddouble

    Most of these will use the obvious corresponding ASN.1 type. 's', 'x', 'd' and 'b' are all different ways of specifying an OCTET STRING value, and the 'u' unsigned type is also used for handling Gauge32 values.

    If the MIB-Files are loaded by into the MIB Tree with "snmp_read_mib" or by specifying it in the libsnmp config, '=' may be used as the type parameter for all object ids as the type can then be automatically read from the MIB.

    Note that there are two ways to set a variable of the type BITS like e.g. "SYNTAX BITS {telnet(0), ftp(1), http(2), icmp(3), snmp(4), ssh(5), https(6)}":

    • Using type "b" and a list of bit numbers. This method is not recommended since GET query for the same OID would return e.g. 0xF8.
    • Using type "x" and a hex number but without(!) the usual "0x" prefix.

    See examples section for more details.

    value

    The new value.

    timeout

    The number of microseconds until the first timeout.

    retries

    The number of times to retry if timeouts occur.

    Return Values

    Returns true on success or false on failure.

    If the SNMP host rejects the data type, an E_WARNING message like "Warning: Error in packet. Reason: (badValue) The value given has the wrong type or length." is shown. If an unknown or invalid OID is specified the warning probably reads "Could not add variable".

    Examples

    Example #1 Using snmp2_set()

    <?php
    snmp2_set    ("localhost", "public", "IF-MIB::ifAlias.3", "s", "foo");
    ?>

    Example #2 Using snmp2_set() for setting BITS SNMP object id

    <?php
    snmp2_set    ("localhost", "public", 'FOO-MIB::bar.42', 'b', '0 1 2 3 4');
    // or
    snmp2_set("localhost", "public", 'FOO-MIB::bar.42', 'x', 'F0');
    ?>

    See Also

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    User Contributed Notes 1 note

    up
    0
    jhuebel at gmail dot com
    13 years ago
    The "type" parameter must be one of the following, depending on the type of variable to set on the SNMP host:

    i INTEGER
    u unsigned INTEGER
    t TIMETICKS
    a IPADDRESS
    o OBJID
    s STRING
    x HEX STRING
    d DECIMAL STRING

    If OPAQUE_SPECIAL_TYPES was defined while compiling the SNMP library, the following are also valid:

    U unsigned int64
    I signed int64
    F float
    D double
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