[2546] Correct issues raised by cppcheck

Mostly adding "const" to methods that don't change the class, but
also correcting a few other points that were raised.

src/lib/dhcp/option.h

@@ -152,7 +152,7 @@ public:
     /// @brief returns option universe (V4 or V6)
     ///
     /// @return universe type
-    Universe  getUniverse() { return universe_; };
+    Universe  getUniverse() const { return universe_; };
 
     /// @brief Writes option in wire-format to a buffer.
     ///
@@ -197,7 +197,7 @@ public:
     /// Returns option type (0-255 for DHCPv4, 0-65535 for DHCPv6)
     ///
     /// @return option type
-    uint16_t getType() { return (type_); }
+    uint16_t getType() const { return (type_); }
 
     /// Returns length of the complete option (data length + DHCPv4/DHCPv6
     /// option header)

src/lib/dhcp/option4_addrlst.h

@@ -111,10 +111,10 @@ public:
     /// We return a copy of our list. Although this includes overhead,
     /// it also makes this list safe to use after this option object
     /// is no longer available. As options are expected to hold only
-    /// a couple (1-3) addresses, the overhead is not that big.
+    /// a few (1-3) addresses, the overhead is not that big.
     ///
     /// @return address container with addresses
-    AddressContainer getAddresses() { return addrs_; };
+    AddressContainer getAddresses() const { return addrs_; };
 
     /// @brief Sets addresses list.
     ///

src/lib/dhcp/option6_addrlst.h

@@ -82,10 +82,10 @@ public:
     /// We return a copy of our list. Although this includes overhead,
     /// it also makes this list safe to use after this option object
     /// is no longer available. As options are expected to hold only
-    /// a couple (1-3) addresses, the overhead is not that big.
+    /// a few (1-3) addresses, the overhead is not that big.
     ///
     /// @return address container with addresses
-    AddressContainer getAddresses() { return addrs_; };
+    AddressContainer getAddresses() const { return addrs_; };
 
     // returns data length (data length + DHCPv4/DHCPv6 option header)
     virtual uint16_t len();

src/lib/dhcp/option_data_types.cc

@@ -209,7 +209,7 @@ OptionDataTypeUtil::writeBool(const bool value,
 std::string
 OptionDataTypeUtil::readString(const std::vector<uint8_t>& buf) {
     std::string value;
-    if (buf.size() > 0) {
+    if (!buf.empty()) {
         value.insert(value.end(), buf.begin(), buf.end());
     }
     return (value);

src/lib/dhcp/option_definition.cc

@@ -144,7 +144,7 @@ OptionDefinition::optionFactory(Option::Universe u, uint16_t type,
 
     OptionBuffer buf;
     if (!array_type_ && type_ != OPT_RECORD_TYPE) {
-        if (values.size() == 0) {
+        if (values.empty()) {
             isc_throw(InvalidOptionValue, "no option value specified");
         }
         writeToBuffer(values[0], type_, buf);

src/lib/dhcp/pkt4.cc

@@ -228,7 +228,7 @@ Pkt4::setHWAddr(uint8_t hType, uint8_t hlen,
         isc_throw(OutOfRange, "Hardware address (len=" << hlen
                   << " too long. Max " << MAX_CHADDR_LEN << " supported.");
     }
-    if ( (macAddr.size() == 0) && (hlen > 0) ) {
+    if (macAddr.empty() && (hlen > 0) ) {
         isc_throw(OutOfRange, "Invalid HW Address specified");
     }
 

src/lib/dhcp/pkt4.h

@@ -367,7 +367,7 @@ public:
     /// @brief Returns remote address
     ///
     /// @return remote address
-    const isc::asiolink::IOAddress& getRemoteAddr() {
+    const isc::asiolink::IOAddress& getRemoteAddr() const {
         return (remote_addr_);
     }
 
@@ -381,7 +381,7 @@ public:
     /// @brief Returns local address.
     ///
     /// @return local address
-    const isc::asiolink::IOAddress& getLocalAddr() {
+    const isc::asiolink::IOAddress& getLocalAddr() const {
         return (local_addr_);
     }
 
@@ -393,7 +393,7 @@ public:
     /// @brief Returns local port.
     ///
     /// @return local port
-    uint16_t getLocalPort() { return (local_port_); }
+    uint16_t getLocalPort() const { return (local_port_); }
 
     /// @brief Sets remote port.
     ///
@@ -403,7 +403,7 @@ public:
     /// @brief Returns remote port.
     ///
     /// @return remote port
-    uint16_t getRemotePort() { return (remote_port_); }
+    uint16_t getRemotePort() const { return (remote_port_); }
 
     /// @brief Update packet timestamp.
     ///

src/lib/dhcp/pkt6.h

@@ -127,7 +127,7 @@ public:
     /// Returns message type (e.g. 1 = SOLICIT)
     ///
     /// @return message type
-    uint8_t getType() { return (msg_type_); }
+    uint8_t getType() const { return (msg_type_); }
 
     /// Sets message type (e.g. 1 = SOLICIT)
     ///
@@ -180,7 +180,9 @@ public:
     /// @brief Returns remote address
     ///
     /// @return remote address
-    const isc::asiolink::IOAddress& getRemoteAddr() { return (remote_addr_); }
+    const isc::asiolink::IOAddress& getRemoteAddr() const {
+        return (remote_addr_);
+    }
 
     /// @brief Sets local address.
     ///
@@ -190,7 +192,9 @@ public:
     /// @brief Returns local address.
     ///
     /// @return local address
-    const isc::asiolink::IOAddress& getLocalAddr() { return (local_addr_); }
+    const isc::asiolink::IOAddress& getLocalAddr() const {
+        return (local_addr_);
+    }
 
     /// @brief Sets local port.
     ///
@@ -200,7 +204,7 @@ public:
     /// @brief Returns local port.
     ///
     /// @return local port
-    uint16_t getLocalPort() { return (local_port_); }
+    uint16_t getLocalPort() const { return (local_port_); }
 
     /// @brief Sets remote port.
     ///
@@ -210,7 +214,7 @@ public:
     /// @brief Returns remote port.
     ///
     /// @return remote port
-    uint16_t getRemotePort() { return (remote_port_); }
+    uint16_t getRemotePort() const { return (remote_port_); }
 
     /// @brief Sets interface index.
     ///

src/lib/dhcpsrv/lease_mgr.h

@@ -118,32 +118,6 @@ struct Lease4 {
     /// @brief Maximum size of a hardware address
     static const size_t HWADDR_MAX = 20;
 
-    /// @brief Constructor
-    ///
-    /// @param addr IPv4 address as unsigned 32-bit integer in network byte
-    ///        order.
-    /// @param hwaddr Hardware address buffer
-    /// @param hwaddr_len Length of hardware address buffer
-    /// @param clientid Client identification buffer
-    /// @param clientid_len Length of client identification buffer
-    /// @param valid_lft Lifetime of the lease
-    /// @param cltt Client last transmission time
-    /// @param subnet_id Subnet identification
-    Lease4(uint32_t addr, const uint8_t* hwaddr, size_t hwaddr_len,
-           const uint8_t* clientid, size_t clientid_len, uint32_t valid_lft,
-           time_t cltt, uint32_t subnet_id)
-        : addr_(addr), ext_(0), hwaddr_(hwaddr, hwaddr + hwaddr_len),
-          client_id_(new ClientId(clientid, clientid_len)), t1_(0), t2_(0),
-          valid_lft_(valid_lft), cltt_(cltt), subnet_id_(subnet_id),
-          fixed_(false), hostname_(), fqdn_fwd_(false), fqdn_rev_(false),
-          comments_()
-    {}
-
-    /// @brief Default Constructor
-    ///
-    /// Initialize fields that don't have a default constructor.
-    Lease4() : addr_(0) {}
-
 
     /// IPv4 address
     isc::asiolink::IOAddress addr_;
@@ -227,6 +201,33 @@ struct Lease4 {
     /// system administrator.
     std::string comments_;
 
+    /// @brief Constructor
+    ///
+    /// @param addr IPv4 address as unsigned 32-bit integer in network byte
+    ///        order.
+    /// @param hwaddr Hardware address buffer
+    /// @param hwaddr_len Length of hardware address buffer
+    /// @param clientid Client identification buffer
+    /// @param clientid_len Length of client identification buffer
+    /// @param valid_lft Lifetime of the lease
+    /// @param cltt Client last transmission time
+    /// @param subnet_id Subnet identification
+    Lease4(uint32_t addr, const uint8_t* hwaddr, size_t hwaddr_len,
+           const uint8_t* clientid, size_t clientid_len, uint32_t valid_lft,
+           time_t cltt, uint32_t subnet_id)
+        : addr_(addr), ext_(0), hwaddr_(hwaddr, hwaddr + hwaddr_len),
+          client_id_(new ClientId(clientid, clientid_len)), t1_(0), t2_(0),
+          valid_lft_(valid_lft), cltt_(cltt), subnet_id_(subnet_id),
+          fixed_(false), hostname_(), fqdn_fwd_(false), fqdn_rev_(false),
+          comments_()
+    {}
+
+    /// @brief Default Constructor
+    ///
+    /// Initialize fields that don't have a default constructor.
+    Lease4() : addr_(0), fixed_(false), fqdn_fwd_(false), fqdn_rev_(false)
+    {}
+
     /// @brief Compare two leases for equality
     ///
     /// @param other lease6 object with which to compare
@@ -265,11 +266,6 @@ struct Lease6 {
         LEASE_IA_PD  /// the lease contains IPv6 prefix (for prefix delegation)
     } LeaseType;
 
-    /// @brief Constructor
-    Lease6(LeaseType type, const isc::asiolink::IOAddress& addr, DuidPtr duid,
-           uint32_t iaid, uint32_t preferred, uint32_t valid, uint32_t t1,
-           uint32_t t2, SubnetID subnet_id, uint8_t prefixlen_ = 0);
-
     /// @brief IPv6 address
     ///
     /// IPv6 address or, in the case of a prefix delegation, the prefix.
@@ -366,10 +362,17 @@ struct Lease6 {
 
     /// @todo: Add DHCPv6 failover related fields here
 
+    /// @brief Constructor
+    Lease6(LeaseType type, const isc::asiolink::IOAddress& addr, DuidPtr duid,
+           uint32_t iaid, uint32_t preferred, uint32_t valid, uint32_t t1,
+           uint32_t t2, SubnetID subnet_id, uint8_t prefixlen_ = 0);
+
     /// @brief Constructor
     ///
     /// Initialize fields that don't have a default constructor.
-    Lease6() : addr_("::") {}
+    Lease6() : addr_("::"), type_(LEASE_IA_NA), fixed_(false), fqdn_fwd_(false),
+               fqdn_rev_(false)
+    {}
 
     /// @brief Convert Lease6 to Printable Form
     ///

src/lib/dhcpsrv/subnet.h

@@ -172,7 +172,7 @@ public:
                     // Use option type as the index key. The type is held
                     // in OptionPtr object so we have to call Option::getType
                     // to retrieve this key for each element.
-                    boost::multi_index::mem_fun<
+                    boost::multi_index::const_mem_fun<
                         Option,
                         uint16_t,
                         &Option::getType

src/lib/dhcpsrv/triplet.h

@@ -37,7 +37,7 @@ public:
     ///
     /// Typically: uint32_t to Triplet assignment. It is very convenient
     /// to be able to simply write Triplet<uint32_t> x = 7;
-    Triplet<T> operator=(T other) {
+    Triplet<T>& operator=(T other) {
         min_ = other;
         default_ = other;
         max_ = other;