Bug Summary

File:home/fedora/workspace/kea-dev/clang-static-analyzer/src/lib/dhcp/option_data_types.cc
Warning:line 523, column 40
The result of right shift is undefined because the right operand is negative

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple x86_64-redhat-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name option_data_types.cc -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/fedora/workspace/kea-dev/clang-static-analyzer/src/lib/dhcp -fcoverage-compilation-dir=/home/fedora/workspace/kea-dev/clang-static-analyzer/src/lib/dhcp -resource-dir /usr/bin/../lib/clang/18 -D HAVE_CONFIG_H -I . -I ../../.. -I ../../../src/lib -I ../../../src/lib -D OS_LINUX -I ../../.. -I ../../.. -D PIC -internal-isystem /usr/bin/../lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14 -internal-isystem /usr/bin/../lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14/x86_64-redhat-linux -internal-isystem /usr/bin/../lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14/backward -internal-isystem /usr/bin/../lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-redhat-linux/14/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O0 -Wwrite-strings -Wno-sign-compare -Wno-missing-field-initializers -std=c++20 -fdeprecated-macro -ferror-limit 19 -stack-protector 2 -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/fedora/workspace/kea-dev/clang-static-analyzer/report/2024-11-20-115345-18960-1 -x c++ option_data_types.cc
1// Copyright (C) 2012-2024 Internet Systems Consortium, Inc. ("ISC")
2//
3// This Source Code Form is subject to the terms of the Mozilla Public
4// License, v. 2.0. If a copy of the MPL was not distributed with this
5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
6
7#include <config.h>
8
9#include <dhcp/option_data_types.h>
10#include <dns/labelsequence.h>
11#include <dns/name.h>
12#include <util/io.h>
13#include <util/str.h>
14#include <util/encode/encode.h>
15#include <algorithm>
16#include <limits>
17
18using namespace isc::asiolink;
19
20namespace {
21/// @brief Bit mask used to compute PSID value.
22///
23/// The mask represents the useful bits of the PSID. The value 0 is a special
24/// case because the RFC explicitly specifies that PSID value should be ignored
25/// if psid_len is 0.
26std::vector<uint16_t> psid_bitmask = { 0xffff,
27 0x8000, 0xc000, 0xe000, 0xf000,
28 0xf800, 0xfc00, 0xfe00, 0xff00,
29 0xff80, 0xffc0, 0xffe0, 0xfff0,
30 0xfff8, 0xfffc, 0xfffe, 0xffff
31};
32}
33
34namespace isc {
35namespace dhcp {
36
37OptionDataTypeUtil::OptionDataTypeUtil() {
38 data_types_["empty"] = OPT_EMPTY_TYPE;
39 data_types_["binary"] = OPT_BINARY_TYPE;
40 data_types_["boolean"] = OPT_BOOLEAN_TYPE;
41 data_types_["int8"] = OPT_INT8_TYPE;
42 data_types_["int16"] = OPT_INT16_TYPE;
43 data_types_["int32"] = OPT_INT32_TYPE;
44 data_types_["uint8"] = OPT_UINT8_TYPE;
45 data_types_["uint16"] = OPT_UINT16_TYPE;
46 data_types_["uint32"] = OPT_UINT32_TYPE;
47 data_types_["ipv4-address"] = OPT_IPV4_ADDRESS_TYPE;
48 data_types_["ipv6-address"] = OPT_IPV6_ADDRESS_TYPE;
49 data_types_["ipv6-prefix"] = OPT_IPV6_PREFIX_TYPE;
50 data_types_["psid"] = OPT_PSID_TYPE;
51 data_types_["string"] = OPT_STRING_TYPE;
52 data_types_["tuple"] = OPT_TUPLE_TYPE;
53 data_types_["fqdn"] = OPT_FQDN_TYPE;
54 data_types_["internal"] = OPT_INTERNAL_TYPE;
55 data_types_["record"] = OPT_RECORD_TYPE;
56
57 data_type_names_[OPT_EMPTY_TYPE] = "empty";
58 data_type_names_[OPT_BINARY_TYPE] = "binary";
59 data_type_names_[OPT_BOOLEAN_TYPE] = "boolean";
60 data_type_names_[OPT_INT8_TYPE] = "int8";
61 data_type_names_[OPT_INT16_TYPE] = "int16";
62 data_type_names_[OPT_INT32_TYPE] = "int32";
63 data_type_names_[OPT_UINT8_TYPE] = "uint8";
64 data_type_names_[OPT_UINT16_TYPE] = "uint16";
65 data_type_names_[OPT_UINT32_TYPE] = "uint32";
66 data_type_names_[OPT_IPV4_ADDRESS_TYPE] = "ipv4-address";
67 data_type_names_[OPT_IPV6_ADDRESS_TYPE] = "ipv6-address";
68 data_type_names_[OPT_IPV6_PREFIX_TYPE] = "ipv6-prefix";
69 data_type_names_[OPT_PSID_TYPE] = "psid";
70 data_type_names_[OPT_STRING_TYPE] = "string";
71 data_type_names_[OPT_TUPLE_TYPE] = "tuple";
72 data_type_names_[OPT_FQDN_TYPE] = "fqdn";
73 data_type_names_[OPT_INTERNAL_TYPE] = "internal";
74 data_type_names_[OPT_RECORD_TYPE] = "record";
75 // The "unknown" data type is declared here so as
76 // it can be returned by reference by a getDataTypeName
77 // function it no other type is suitable. Other than that
78 // this is unused.
79 data_type_names_[OPT_UNKNOWN_TYPE] = "unknown";
80}
81
82OptionDataType
83OptionDataTypeUtil::getDataType(const std::string& data_type) {
84 return (OptionDataTypeUtil::instance().getDataTypeImpl(data_type));
85}
86
87OptionDataType
88OptionDataTypeUtil::getDataTypeImpl(const std::string& data_type) const {
89 std::map<std::string, OptionDataType>::const_iterator data_type_it =
90 data_types_.find(data_type);
91 if (data_type_it != data_types_.end()) {
92 return (data_type_it->second);
93 }
94 return (OPT_UNKNOWN_TYPE);
95}
96
97int
98OptionDataTypeUtil::getDataTypeLen(const OptionDataType data_type) {
99 switch (data_type) {
100 case OPT_BOOLEAN_TYPE:
101 case OPT_INT8_TYPE:
102 case OPT_UINT8_TYPE:
103 return (1);
104
105 case OPT_INT16_TYPE:
106 case OPT_UINT16_TYPE:
107 return (2);
108
109 case OPT_INT32_TYPE:
110 case OPT_UINT32_TYPE:
111 return (4);
112
113 case OPT_IPV4_ADDRESS_TYPE:
114 return (asiolink::V4ADDRESS_LEN);
115
116 case OPT_IPV6_ADDRESS_TYPE:
117 return (asiolink::V6ADDRESS_LEN);
118
119 case OPT_PSID_TYPE:
120 return (3);
121
122 default:
123 ;
124 }
125 return (0);
126}
127
128const std::string&
129OptionDataTypeUtil::getDataTypeName(const OptionDataType data_type) {
130 return (OptionDataTypeUtil::instance().getDataTypeNameImpl(data_type));
131}
132
133const std::string&
134OptionDataTypeUtil::getDataTypeNameImpl(const OptionDataType data_type) const {
135 std::map<OptionDataType, std::string>::const_iterator data_type_it =
136 data_type_names_.find(data_type);
137 if (data_type_it != data_type_names_.end()) {
138 return (data_type_it->second);
139 }
140 return (data_type_names_.find(OPT_UNKNOWN_TYPE)->second);
141}
142
143OptionDataTypeUtil&
144OptionDataTypeUtil::instance() {
145 static OptionDataTypeUtil instance;
146 return (instance);
147}
148
149asiolink::IOAddress
150OptionDataTypeUtil::readAddress(const std::vector<uint8_t>& buf,
151 const short family) {
152 using namespace isc::asiolink;
153 if (family == AF_INET2) {
154 if (buf.size() < V4ADDRESS_LEN) {
155 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IPv4 address. Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 156, oss__
.str().c_str()); } while (1)
156 << " IPv4 address. Invalid buffer size: " << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IPv4 address. Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 156, oss__
.str().c_str()); } while (1);
157 }
158 return (IOAddress::fromBytes(AF_INET2, &buf[0]));
159 } else if (family == AF_INET610) {
160 if (buf.size() < V6ADDRESS_LEN) {
161 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IPv6 address. Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 162, oss__
.str().c_str()); } while (1)
162 << " IPv6 address. Invalid buffer size: " << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IPv6 address. Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 162, oss__
.str().c_str()); } while (1);
163 }
164 return (IOAddress::fromBytes(AF_INET610, &buf[0]));
165 } else {
166 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IP address. Invalid family: " << family; throw
BadDataTypeCast("option_data_types.cc", 167, oss__.str().c_str
()); } while (1)
167 << " IP address. Invalid family: " << family)do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " IP address. Invalid family: " << family; throw
BadDataTypeCast("option_data_types.cc", 167, oss__.str().c_str
()); } while (1);
168 }
169}
170
171void
172OptionDataTypeUtil::writeAddress(const asiolink::IOAddress& address,
173 std::vector<uint8_t>& buf) {
174 const std::vector<uint8_t>& vec = address.toBytes();
175 buf.insert(buf.end(), vec.begin(), vec.end());
176}
177
178void
179OptionDataTypeUtil::writeBinary(const std::string& hex_str,
180 std::vector<uint8_t>& buf) {
181 // Binary value means that the value is encoded as a string
182 // of hexadecimal digits. We need to decode this string
183 // to the binary format here.
184 OptionBuffer binary;
185 try {
186 util::encode::decodeHex(hex_str, binary);
187 } catch (const Exception& ex) {
188 isc_throw(BadDataTypeCast, "unable to cast " << hex_strdo { std::ostringstream oss__; oss__ << "unable to cast "
<< hex_str << " to binary data type: " << ex
.what(); throw BadDataTypeCast("option_data_types.cc", 189, oss__
.str().c_str()); } while (1)
189 << " to binary data type: " << ex.what())do { std::ostringstream oss__; oss__ << "unable to cast "
<< hex_str << " to binary data type: " << ex
.what(); throw BadDataTypeCast("option_data_types.cc", 189, oss__
.str().c_str()); } while (1);
190 }
191 // Decode was successful so append decoded binary value
192 // to the buffer.
193 buf.insert(buf.end(), binary.begin(), binary.end());
194}
195
196OpaqueDataTuple::LengthFieldType
197OptionDataTypeUtil::getTupleLenFieldType(Option::Universe u) {
198 if (u == Option::V4) {
199 return (OpaqueDataTuple::LENGTH_1_BYTE);
200 }
201 return (OpaqueDataTuple::LENGTH_2_BYTES);
202}
203
204std::string
205OptionDataTypeUtil::readTuple(const std::vector<uint8_t>& buf,
206 OpaqueDataTuple::LengthFieldType lengthfieldtype) {
207 if (lengthfieldtype == OpaqueDataTuple::LENGTH_1_BYTE) {
208 if (buf.size() < 1) {
209 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 211, oss__
.str().c_str()); } while (1)
210 << " tuple (length). Invalid buffer size: "do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 211, oss__
.str().c_str()); } while (1)
211 << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 211, oss__
.str().c_str()); } while (1);
212 }
213 uint8_t len = buf[0];
214 if (buf.size() < 1 + len) {
215 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << static_cast<unsigned>
(len) << "). Invalid buffer size: " << buf.size()
; throw BadDataTypeCast("option_data_types.cc", 217, oss__.str
().c_str()); } while (1)
216 << " tuple (length " << static_cast<unsigned>(len)do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << static_cast<unsigned>
(len) << "). Invalid buffer size: " << buf.size()
; throw BadDataTypeCast("option_data_types.cc", 217, oss__.str
().c_str()); } while (1)
217 << "). Invalid buffer size: " << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << static_cast<unsigned>
(len) << "). Invalid buffer size: " << buf.size()
; throw BadDataTypeCast("option_data_types.cc", 217, oss__.str
().c_str()); } while (1);
218 }
219 std::string value;
220 value.resize(len);
221 std::memcpy(&value[0], &buf[1], len);
222 return (value);
223 } else if (lengthfieldtype == OpaqueDataTuple::LENGTH_2_BYTES) {
224 if (buf.size() < 2) {
225 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 227, oss__
.str().c_str()); } while (1)
226 << " tuple (length). Invalid buffer size: "do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 227, oss__
.str().c_str()); } while (1)
227 << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length). Invalid buffer size: " << buf
.size(); throw BadDataTypeCast("option_data_types.cc", 227, oss__
.str().c_str()); } while (1);
228 }
229 uint16_t len = isc::util::readUint16(&buf[0], 2);
230 if (buf.size() < 2 + len) {
231 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << len << "). Invalid buffer size: "
<< buf.size(); throw BadDataTypeCast("option_data_types.cc"
, 233, oss__.str().c_str()); } while (1)
232 << " tuple (length " << lendo { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << len << "). Invalid buffer size: "
<< buf.size(); throw BadDataTypeCast("option_data_types.cc"
, 233, oss__.str().c_str()); } while (1)
233 << "). Invalid buffer size: " << buf.size())do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple (length " << len << "). Invalid buffer size: "
<< buf.size(); throw BadDataTypeCast("option_data_types.cc"
, 233, oss__.str().c_str()); } while (1);
234 }
235 std::string value;
236 value.resize(len);
237 std::memcpy(&value[0], &buf[2], len);
238 return (value);
239 } else {
240 isc_throw(BadDataTypeCast, "unable to read data from the buffer as"do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 242, oss__.str().c_str()); } while (1)
241 << " tuple. Invalid length type field: "do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 242, oss__.str().c_str()); } while (1)
242 << static_cast<unsigned>(lengthfieldtype))do { std::ostringstream oss__; oss__ << "unable to read data from the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 242, oss__.str().c_str()); } while (1);
243 }
244}
245
246void
247OptionDataTypeUtil::readTuple(const std::vector<uint8_t>& buf,
248 OpaqueDataTuple& tuple) {
249 try {
250 tuple.unpack(buf.begin(), buf.end());
251 } catch (const OpaqueDataTupleError& ex) {
252 isc_throw(BadDataTypeCast, ex.what())do { std::ostringstream oss__; oss__ << ex.what(); throw
BadDataTypeCast("option_data_types.cc", 252, oss__.str().c_str
()); } while (1);
253 }
254}
255
256void
257OptionDataTypeUtil::writeTuple(const std::string& value,
258 OpaqueDataTuple::LengthFieldType lengthfieldtype,
259 std::vector<uint8_t>& buf) {
260 if (lengthfieldtype == OpaqueDataTuple::LENGTH_1_BYTE) {
261 if (value.size() > std::numeric_limits<uint8_t>::max()) {
262 isc_throw(BadDataTypeCast, "invalid tuple value (size "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << +std
::numeric_limits<uint8_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 264, oss__.str().c_str()); } while (
1)
263 << value.size() << " larger than "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << +std
::numeric_limits<uint8_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 264, oss__.str().c_str()); } while (
1)
264 << +std::numeric_limits<uint8_t>::max() << ")")do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << +std
::numeric_limits<uint8_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 264, oss__.str().c_str()); } while (
1);
265 }
266 buf.push_back(static_cast<uint8_t>(value.size()));
267
268 } else if (lengthfieldtype == OpaqueDataTuple::LENGTH_2_BYTES) {
269 if (value.size() > std::numeric_limits<uint16_t>::max()) {
270 isc_throw(BadDataTypeCast, "invalid tuple value (size "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << std::
numeric_limits<uint16_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 272, oss__.str().c_str()); } while (
1)
271 << value.size() << " larger than "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << std::
numeric_limits<uint16_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 272, oss__.str().c_str()); } while (
1)
272 << std::numeric_limits<uint16_t>::max() << ")")do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< value.size() << " larger than " << std::
numeric_limits<uint16_t>::max() << ")"; throw BadDataTypeCast
("option_data_types.cc", 272, oss__.str().c_str()); } while (
1);
273 }
274 buf.resize(buf.size() + 2);
275 isc::util::writeUint16(static_cast<uint16_t>(value.size()),
276 &buf[buf.size() - 2], 2);
277 } else {
278 isc_throw(BadDataTypeCast, "unable to write data to the buffer as"do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 280, oss__.str().c_str()); } while (1)
279 << " tuple. Invalid length type field: "do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 280, oss__.str().c_str()); } while (1)
280 << static_cast<unsigned>(lengthfieldtype))do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << static_cast
<unsigned>(lengthfieldtype); throw BadDataTypeCast("option_data_types.cc"
, 280, oss__.str().c_str()); } while (1);
281 }
282 buf.insert(buf.end(), value.begin(), value.end());
283}
284
285void
286OptionDataTypeUtil::writeTuple(const OpaqueDataTuple& tuple,
287 std::vector<uint8_t>& buf) {
288 if (tuple.getLength() == 0) {
289 isc_throw(BadDataTypeCast, "invalid empty tuple value")do { std::ostringstream oss__; oss__ << "invalid empty tuple value"
; throw BadDataTypeCast("option_data_types.cc", 289, oss__.str
().c_str()); } while (1);
290 }
291 if (tuple.getLengthFieldType() == OpaqueDataTuple::LENGTH_1_BYTE) {
292 if (tuple.getLength() > std::numeric_limits<uint8_t>::max()) {
293 isc_throw(BadDataTypeCast, "invalid tuple value (size "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
+std::numeric_limits<uint8_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 295, oss__.str().c_str
()); } while (1)
294 << tuple.getLength() << " larger than "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
+std::numeric_limits<uint8_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 295, oss__.str().c_str
()); } while (1)
295 << +std::numeric_limits<uint8_t>::max() << ")")do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
+std::numeric_limits<uint8_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 295, oss__.str().c_str
()); } while (1);
296 }
297 buf.push_back(static_cast<uint8_t>(tuple.getLength()));
298
299 } else if (tuple.getLengthFieldType() == OpaqueDataTuple::LENGTH_2_BYTES) {
300 if (tuple.getLength() > std::numeric_limits<uint16_t>::max()) {
301 isc_throw(BadDataTypeCast, "invalid tuple value (size "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
std::numeric_limits<uint16_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 303, oss__.str().c_str
()); } while (1)
302 << tuple.getLength() << " larger than "do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
std::numeric_limits<uint16_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 303, oss__.str().c_str
()); } while (1)
303 << std::numeric_limits<uint16_t>::max() << ")")do { std::ostringstream oss__; oss__ << "invalid tuple value (size "
<< tuple.getLength() << " larger than " <<
std::numeric_limits<uint16_t>::max() << ")"; throw
BadDataTypeCast("option_data_types.cc", 303, oss__.str().c_str
()); } while (1);
304 }
305 buf.resize(buf.size() + 2);
306 isc::util::writeUint16(static_cast<uint16_t>(tuple.getLength()),
307 &buf[buf.size() - 2], 2);
308 } else {
309 isc_throw(BadDataTypeCast, "unable to write data to the buffer as"do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << tuple
.getLengthFieldType(); throw BadDataTypeCast("option_data_types.cc"
, 311, oss__.str().c_str()); } while (1)
310 << " tuple. Invalid length type field: "do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << tuple
.getLengthFieldType(); throw BadDataTypeCast("option_data_types.cc"
, 311, oss__.str().c_str()); } while (1)
311 << tuple.getLengthFieldType())do { std::ostringstream oss__; oss__ << "unable to write data to the buffer as"
<< " tuple. Invalid length type field: " << tuple
.getLengthFieldType(); throw BadDataTypeCast("option_data_types.cc"
, 311, oss__.str().c_str()); } while (1);
312 }
313 buf.insert(buf.end(), tuple.getData().begin(), tuple.getData().end());
314}
315
316bool
317OptionDataTypeUtil::readBool(const std::vector<uint8_t>& buf) {
318 if (buf.empty()) {
319 isc_throw(BadDataTypeCast, "unable to read the buffer as boolean"do { std::ostringstream oss__; oss__ << "unable to read the buffer as boolean"
<< " value. Invalid buffer size " << buf.size();
throw BadDataTypeCast("option_data_types.cc", 320, oss__.str
().c_str()); } while (1)
320 << " value. Invalid buffer size " << buf.size())do { std::ostringstream oss__; oss__ << "unable to read the buffer as boolean"
<< " value. Invalid buffer size " << buf.size();
throw BadDataTypeCast("option_data_types.cc", 320, oss__.str
().c_str()); } while (1);
321 }
322 if (buf[0] == 1) {
323 return (true);
324 } else if (buf[0] == 0) {
325 return (false);
326 }
327 isc_throw(BadDataTypeCast, "unable to read the buffer as boolean"do { std::ostringstream oss__; oss__ << "unable to read the buffer as boolean"
<< " value. Invalid value " << static_cast<int
>(buf[0]); throw BadDataTypeCast("option_data_types.cc", 328
, oss__.str().c_str()); } while (1)
328 << " value. Invalid value " << static_cast<int>(buf[0]))do { std::ostringstream oss__; oss__ << "unable to read the buffer as boolean"
<< " value. Invalid value " << static_cast<int
>(buf[0]); throw BadDataTypeCast("option_data_types.cc", 328
, oss__.str().c_str()); } while (1);
329}
330
331void
332OptionDataTypeUtil::writeBool(const bool value,
333 std::vector<uint8_t>& buf) {
334 buf.push_back(static_cast<uint8_t>(value ? 1 : 0));
335}
336
337std::string
338OptionDataTypeUtil::readFqdn(const std::vector<uint8_t>& buf) {
339 // If buffer is empty emit an error.
340 if (buf.empty()) {
341 isc_throw(BadDataTypeCast, "unable to read FQDN from a buffer."do { std::ostringstream oss__; oss__ << "unable to read FQDN from a buffer."
<< " The buffer is empty."; throw BadDataTypeCast("option_data_types.cc"
, 342, oss__.str().c_str()); } while (1)
342 << " The buffer is empty.")do { std::ostringstream oss__; oss__ << "unable to read FQDN from a buffer."
<< " The buffer is empty."; throw BadDataTypeCast("option_data_types.cc"
, 342, oss__.str().c_str()); } while (1);
343 }
344 // Set up an InputBuffer so as we can use isc::dns::Name object to get the FQDN.
345 isc::util::InputBuffer in_buf(static_cast<const void*>(&buf[0]), buf.size());
346 try {
347 // Try to create an object from the buffer. If exception is thrown
348 // it means that the buffer doesn't hold a valid domain name (invalid
349 // syntax).
350 isc::dns::Name name(in_buf);
351 return (name.toText());
352 } catch (const isc::Exception& ex) {
353 // Unable to convert the data in the buffer into FQDN.
354 isc_throw(BadDataTypeCast, ex.what())do { std::ostringstream oss__; oss__ << ex.what(); throw
BadDataTypeCast("option_data_types.cc", 354, oss__.str().c_str
()); } while (1);
355 }
356}
357
358void
359OptionDataTypeUtil::writeFqdn(const std::string& fqdn,
360 std::vector<uint8_t>& buf,
361 bool downcase) {
362 try {
363 isc::dns::Name name(fqdn, downcase);
364 isc::dns::LabelSequence labels(name);
365 if (labels.getDataLength() > 0) {
366 size_t read_len = 0;
367 const uint8_t* data = labels.getData(&read_len);
368 buf.insert(buf.end(), data, data + read_len);
369 }
370 } catch (const isc::Exception& ex) {
371 isc_throw(BadDataTypeCast, ex.what())do { std::ostringstream oss__; oss__ << ex.what(); throw
BadDataTypeCast("option_data_types.cc", 371, oss__.str().c_str
()); } while (1);
372 }
373}
374
375unsigned int
376OptionDataTypeUtil::getLabelCount(const std::string& text_name) {
377 // The isc::dns::Name class doesn't accept empty names. However, in some
378 // cases we may be dealing with empty names (e.g. sent by the DHCP clients).
379 // Empty names should not be sent as hostnames but if they are, for some
380 // reason, we don't want to throw an exception from this function. We
381 // rather want to signal empty name by returning 0 number of labels.
382 if (text_name.empty()) {
383 return (0);
384 }
385 try {
386 isc::dns::Name name(text_name);
387 return (name.getLabelCount());
388 } catch (const isc::Exception& ex) {
389 isc_throw(BadDataTypeCast, ex.what())do { std::ostringstream oss__; oss__ << ex.what(); throw
BadDataTypeCast("option_data_types.cc", 389, oss__.str().c_str
()); } while (1);
390 }
391}
392
393PrefixTuple
394OptionDataTypeUtil::readPrefix(const std::vector<uint8_t>& buf) {
395 // Prefix typically consists of the prefix length and the
396 // actual value. If prefix length is 0, the buffer length should
397 // be at least 1 byte to hold this length value.
398 if (buf.empty()) {
399 isc_throw(BadDataTypeCast, "unable to read prefix length from "do { std::ostringstream oss__; oss__ << "unable to read prefix length from "
"a truncated buffer"; throw BadDataTypeCast("option_data_types.cc"
, 400, oss__.str().c_str()); } while (1)
400 "a truncated buffer")do { std::ostringstream oss__; oss__ << "unable to read prefix length from "
"a truncated buffer"; throw BadDataTypeCast("option_data_types.cc"
, 400, oss__.str().c_str()); } while (1);
401 }
402
403 // Surround everything with try-catch to unify exceptions being
404 // thrown by various functions and constructors.
405 try {
406 // Try to create PrefixLen object from the prefix length held
407 // in the buffer. This may cause an exception if the length is
408 // invalid (greater than 128).
409 PrefixLen prefix_len(buf.at(0));
410
411 // Convert prefix length to bytes, because we operate on bytes,
412 // rather than bits.
413 uint8_t prefix_len_bytes = (prefix_len.asUint8() / 8);
414 // Check if we need to zero pad any bits. This is the case when
415 // the prefix length is not divisible by 8 (bits per byte). The
416 // calculations below may require some explanations. We first
417 // perform prefix_len % 8 to get the number of useful bits beyond
418 // the current prefix_len_bytes value. By substracting it from 8
419 // we get the number of zero padded bits, but with the special
420 // case of 8 when the result of substraction is 0. The value of
421 // 8 really means no padding so we make a modulo division once
422 // again to turn 8s to 0s.
423 const uint8_t zero_padded_bits =
424 static_cast<uint8_t>((8 - (prefix_len.asUint8() % 8)) % 8);
425 // If there are zero padded bits, it means that we need an extra
426 // byte to be retrieved from the buffer.
427 if (zero_padded_bits > 0) {
428 ++prefix_len_bytes;
429 }
430
431 // Make sure that the buffer is long enough. We substract 1 to
432 // also account for the fact that the buffer includes a prefix
433 // length besides a prefix.
434 if ((buf.size() - 1) < prefix_len_bytes) {
435 isc_throw(BadDataTypeCast, "unable to read a prefix having length of "do { std::ostringstream oss__; oss__ << "unable to read a prefix having length of "
<< prefix_len.asUnsigned() << " from a truncated buffer"
; throw BadDataTypeCast("option_data_types.cc", 436, oss__.str
().c_str()); } while (1)
436 << prefix_len.asUnsigned() << " from a truncated buffer")do { std::ostringstream oss__; oss__ << "unable to read a prefix having length of "
<< prefix_len.asUnsigned() << " from a truncated buffer"
; throw BadDataTypeCast("option_data_types.cc", 436, oss__.str
().c_str()); } while (1);
437 }
438
439 // It is possible for a prefix to be zero if the prefix length
440 // is zero.
441 IOAddress prefix(IOAddress::IPV6_ZERO_ADDRESS());
442
443 // If there is anything more than prefix length is this buffer
444 // we need to read it.
445 if (buf.size() > 1) {
446 // Buffer has to be copied, because we will modify its
447 // contents by setting certain bits to 0, if necessary.
448 std::vector<uint8_t> prefix_buf(buf.begin() + 1, buf.end());
449 // All further conversions require that the buffer length is
450 // 16 bytes.
451 if (prefix_buf.size() < V6ADDRESS_LEN) {
452 prefix_buf.resize(V6ADDRESS_LEN);
453 if (prefix_len_bytes < prefix_buf.size()) {
454 // Zero all bits in the buffer beyond prefix length
455 // position.
456 std::fill(prefix_buf.begin() + prefix_len_bytes,
457 prefix_buf.end(), 0);
458
459 if (zero_padded_bits) {
460 // There is a byte that require zero padding. We
461 // achieve that by shifting the value of that byte
462 // back and forth by the number of zeroed bits.
463 prefix_buf.at(prefix_len_bytes - 1) =
464 (prefix_buf.at(prefix_len_bytes - 1)
465 >> zero_padded_bits)
466 << zero_padded_bits;
467 }
468 }
469 }
470 // Convert the buffer to the IOAddress object.
471 prefix = IOAddress::fromBytes(AF_INET610, &prefix_buf[0]);
472 }
473
474 return (std::make_pair(prefix_len, prefix));
475
476 } catch (const BadDataTypeCast& ex) {
477 // Pass through the BadDataTypeCast exceptions.
478 throw;
479
480 } catch (const std::exception& ex) {
481 // If an exception of a different type has been thrown, insert
482 // a text that indicates that the failure occurred during reading
483 // the prefix and modify exception type to BadDataTypeCast.
484 isc_throw(BadDataTypeCast, "unable to read a prefix from a buffer: "do { std::ostringstream oss__; oss__ << "unable to read a prefix from a buffer: "
<< ex.what(); throw BadDataTypeCast("option_data_types.cc"
, 485, oss__.str().c_str()); } while (1)
485 << ex.what())do { std::ostringstream oss__; oss__ << "unable to read a prefix from a buffer: "
<< ex.what(); throw BadDataTypeCast("option_data_types.cc"
, 485, oss__.str().c_str()); } while (1);
486 }
487}
488
489void
490OptionDataTypeUtil::writePrefix(const PrefixLen& prefix_len,
491 const IOAddress& prefix,
492 std::vector<uint8_t>& buf) {
493 // Prefix must be an IPv6 prefix.
494 if (!prefix.isV6()) {
1
Taking false branch
→
495 isc_throw(BadDataTypeCast, "illegal prefix value "do { std::ostringstream oss__; oss__ << "illegal prefix value "
<< prefix; throw BadDataTypeCast("option_data_types.cc"
, 496, oss__.str().c_str()); } while (1)
496 << prefix)do { std::ostringstream oss__; oss__ << "illegal prefix value "
<< prefix; throw BadDataTypeCast("option_data_types.cc"
, 496, oss__.str().c_str()); } while (1);
497 }
498
499 // We don't need to validate the prefix_len value, because it is
500 // already validated by the PrefixLen class.
501 buf.push_back(prefix_len.asUint8());
502
503 // Convert the prefix length to a number of bytes.
504 uint8_t prefix_len_bytes = prefix_len.asUint8() / 8;
505 // Check if there are any bits that require zero padding. See the
506 // commentary in readPrefix to see how this is calculated.
507 const uint8_t zero_padded_bits =
2
←
'zero_padded_bits' initialized here
→
508 static_cast<uint8_t>((8 - (prefix_len.asUint8() % 8)) % 8);
509 // If zero padding is needed it means that we need to extend the
510 // buffer to hold the "partially occupied" byte.
511 if (zero_padded_bits > 0) {
3
←
Assuming 'zero_padded_bits' is <= 0
→
4
←
Taking false branch
→
512 ++prefix_len_bytes;
513 }
514
515 // Convert the prefix to byte representation and append it to
516 // our output buffer.
517 std::vector<uint8_t> prefix_bytes = prefix.toBytes();
518 buf.insert(buf.end(), prefix_bytes.begin(),
519 prefix_bytes.begin() + prefix_len_bytes);
520 // If the last byte requires zero padding we achieve that by shifting
521 // bits back and forth by the number of insignificant bits.
522 if (zero_padded_bits) {
5
←
Assuming 'zero_padded_bits' is not equal to 0
→
6
←
Taking true branch
→
523 *buf.rbegin() = (*buf.rbegin() >> zero_padded_bits) << zero_padded_bits;
7
←
The result of right shift is undefined because the right operand is negative
524 }
525}
526
527PSIDTuple
528OptionDataTypeUtil::readPsid(const std::vector<uint8_t>& buf) {
529 if (buf.size() < 3) {
530 isc_throw(BadDataTypeCast, "unable to read PSID from the buffer."do { std::ostringstream oss__; oss__ << "unable to read PSID from the buffer."
<< " Invalid buffer size " << buf.size() <<
". Expected 3 bytes (PSID length and PSID value)"; throw BadDataTypeCast
("option_data_types.cc", 532, oss__.str().c_str()); } while (
1)
531 << " Invalid buffer size " << buf.size()do { std::ostringstream oss__; oss__ << "unable to read PSID from the buffer."
<< " Invalid buffer size " << buf.size() <<
". Expected 3 bytes (PSID length and PSID value)"; throw BadDataTypeCast
("option_data_types.cc", 532, oss__.str().c_str()); } while (
1)
532 << ". Expected 3 bytes (PSID length and PSID value)")do { std::ostringstream oss__; oss__ << "unable to read PSID from the buffer."
<< " Invalid buffer size " << buf.size() <<
". Expected 3 bytes (PSID length and PSID value)"; throw BadDataTypeCast
("option_data_types.cc", 532, oss__.str().c_str()); } while (
1);
533 }
534
535 // Read PSID length.
536 uint8_t psid_len = buf[0];
537
538 // PSID length must not be greater than 16 bits.
539 if (psid_len > (sizeof(uint16_t) * 8)) {
540 isc_throw(BadDataTypeCast, "invalid PSID length value "do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< static_cast<unsigned>(psid_len) << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 542, oss__.str
().c_str()); } while (1)
541 << static_cast<unsigned>(psid_len)do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< static_cast<unsigned>(psid_len) << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 542, oss__.str
().c_str()); } while (1)
542 << ", this value is expected to be in range of 0 to 16")do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< static_cast<unsigned>(psid_len) << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 542, oss__.str
().c_str()); } while (1);
543 }
544
545 // Read two bytes of PSID value.
546 uint16_t psid = isc::util::readUint16(&buf[1], 2);
547
548 // We need to check that the PSID value does not exceed the maximum value
549 // for a specified PSID length. That means that all bits placed further than
550 // psid_len from the left must be set to 0.
551 // The value 0 is a special case because the RFC explicitly says that the
552 // PSID value should be ignored if psid_len is 0.
553 if ((psid & ~psid_bitmask[psid_len]) != 0) {
554 isc_throw(BadDataTypeCast, "invalid PSID value " << psiddo { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid << " for a specified PSID length " <<
static_cast<unsigned>(psid_len); throw BadDataTypeCast
("option_data_types.cc", 556, oss__.str().c_str()); } while (
1)
555 << " for a specified PSID length "do { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid << " for a specified PSID length " <<
static_cast<unsigned>(psid_len); throw BadDataTypeCast
("option_data_types.cc", 556, oss__.str().c_str()); } while (
1)
556 << static_cast<unsigned>(psid_len))do { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid << " for a specified PSID length " <<
static_cast<unsigned>(psid_len); throw BadDataTypeCast
("option_data_types.cc", 556, oss__.str().c_str()); } while (
1);
557 }
558
559 // All is good, so we can convert the PSID value read from the buffer to
560 // the port set number.
561 if (psid_len == 0) {
562 // Shift by 16 always gives zero (CID 1398333)
563 psid = 0;
564 } else {
565 psid >>= (sizeof(psid) * 8 - psid_len);
566 }
567 return (std::make_pair(PSIDLen(psid_len), PSID(psid)));
568}
569
570void
571OptionDataTypeUtil::writePsid(const PSIDLen& psid_len, const PSID& psid,
572 std::vector<uint8_t>& buf) {
573 if (psid_len.asUint8() > (sizeof(psid) * 8)) {
574 isc_throw(BadDataTypeCast, "invalid PSID length value "do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< psid_len.asUnsigned() << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 576, oss__.str
().c_str()); } while (1)
575 << psid_len.asUnsigned()do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< psid_len.asUnsigned() << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 576, oss__.str
().c_str()); } while (1)
576 << ", this value is expected to be in range of 0 to 16")do { std::ostringstream oss__; oss__ << "invalid PSID length value "
<< psid_len.asUnsigned() << ", this value is expected to be in range of 0 to 16"
; throw BadDataTypeCast("option_data_types.cc", 576, oss__.str
().c_str()); } while (1);
577 }
578
579 if ((psid_len.asUint8() > 0) &&
580 (psid.asUint16() > (0xFFFF >> (sizeof(uint16_t) * 8 - psid_len.asUint8())))) {
581 isc_throw(BadDataTypeCast, "invalid PSID value " << psid.asUint16()do { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid.asUint16() << " for a specified PSID length "
<< psid_len.asUnsigned(); throw BadDataTypeCast("option_data_types.cc"
, 583, oss__.str().c_str()); } while (1)
582 << " for a specified PSID length "do { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid.asUint16() << " for a specified PSID length "
<< psid_len.asUnsigned(); throw BadDataTypeCast("option_data_types.cc"
, 583, oss__.str().c_str()); } while (1)
583 << psid_len.asUnsigned())do { std::ostringstream oss__; oss__ << "invalid PSID value "
<< psid.asUint16() << " for a specified PSID length "
<< psid_len.asUnsigned(); throw BadDataTypeCast("option_data_types.cc"
, 583, oss__.str().c_str()); } while (1);
584 }
585
586 buf.resize(buf.size() + 3);
587 buf.at(buf.size() - 3) = psid_len.asUint8();
588 isc::util::writeUint16(static_cast<uint16_t>
589 (psid.asUint16() << (sizeof(uint16_t) * 8 - psid_len.asUint8())),
590 &buf[buf.size() - 2], 2);
591}
592
593std::string
594OptionDataTypeUtil::readString(const std::vector<uint8_t>& buf) {
595 std::string value;
596 if (!buf.empty()) {
597 // Per RFC 2132, section 2 we need to drop trailing NULLs
598 auto begin = buf.begin();
599 auto end = util::str::seekTrimmed(begin, buf.end(), 0x0);
600 if (std::distance(begin, end) == 0) {
601 isc_throw(isc::OutOfRange, "string value carried by the option "do { std::ostringstream oss__; oss__ << "string value carried by the option "
"contained only NULLs"; throw isc::OutOfRange("option_data_types.cc"
, 602, oss__.str().c_str()); } while (1)
602 "contained only NULLs")do { std::ostringstream oss__; oss__ << "string value carried by the option "
"contained only NULLs"; throw isc::OutOfRange("option_data_types.cc"
, 602, oss__.str().c_str()); } while (1);
603 }
604
605 value.insert(value.end(), begin, end);
606 }
607
608 return (value);
609}
610
611void
612OptionDataTypeUtil::writeString(const std::string& value,
613 std::vector<uint8_t>& buf) {
614 if (value.size() > 0) {
615 buf.insert(buf.end(), value.begin(), value.end());
616 }
617}
618
619} // end of isc::dhcp namespace
620} // end of isc namespace