147 lines
4.8 KiB
C++
147 lines
4.8 KiB
C++
/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* dhcpcd_test.cpp - unit tests for dhcpcd
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string>
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#include <gtest/gtest.h>
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// For convenience.
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#define ARRAYSIZE(x) sizeof((x)) / sizeof((x)[0])
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// Regrettably, copy these defines and the dhcp_message structure in from
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// dhcp.h. This header file is not easily included, since subsequent
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// includes use C++ reserved keywords (like "new") as structure member names.
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extern "C" {
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#define DHO_PAD 0
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#define DHO_DNSDOMAIN 15
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/* Max MTU - defines dhcp option length */
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#define MTU_MAX 1500
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/* Sizes for DHCP options */
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#define DHCP_CHADDR_LEN 16
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#define SERVERNAME_LEN 64
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#define BOOTFILE_LEN 128
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#define DHCP_UDP_LEN (14 + 20 + 8)
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#define DHCP_FIXED_LEN (DHCP_UDP_LEN + 226)
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#define DHCP_OPTION_LEN (MTU_MAX - DHCP_FIXED_LEN)
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/* Some crappy DHCP servers require the BOOTP minimum length */
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#define BOOTP_MESSAGE_LENTH_MIN 300
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struct dhcp_message {
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uint8_t op; /* message type */
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uint8_t hwtype; /* hardware address type */
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uint8_t hwlen; /* hardware address length */
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uint8_t hwopcount; /* should be zero in client message */
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uint32_t xid; /* transaction id */
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uint16_t secs; /* elapsed time in sec. from boot */
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uint16_t flags;
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uint32_t ciaddr; /* (previously allocated) client IP */
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uint32_t yiaddr; /* 'your' client IP address */
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uint32_t siaddr; /* should be zero in client's messages */
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uint32_t giaddr; /* should be zero in client's messages */
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uint8_t chaddr[DHCP_CHADDR_LEN]; /* client's hardware address */
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uint8_t servername[SERVERNAME_LEN]; /* server host name */
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uint8_t bootfile[BOOTFILE_LEN]; /* boot file name */
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uint32_t cookie;
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uint8_t options[DHCP_OPTION_LEN]; /* message options - cookie */
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} _packed;
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char * get_option_string(const struct dhcp_message *dhcp, uint8_t option);
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}
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static const char kOptionString[] = "hostname";
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class DhcpcdGetOptionTest : public ::testing::Test {
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protected:
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virtual void SetUp() {
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memset(dhcpmsgs, 0, ARRAYSIZE(dhcpmsgs) * sizeof(struct dhcp_message));
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// Technically redundant.
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memset(&(dhcpmsgs[0].options), DHO_PAD, sizeof(dhcpmsgs[0].options));
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type_index = 0;
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length_index = 0;
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value_index = 0;
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}
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void PopulateTLV() {
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// May very well write off the end of the first struct dhcp_message,
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// by design.
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length_index = type_index + 1;
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value_index = length_index + 1;
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dhcpmsgs[0].options[type_index] = DHO_DNSDOMAIN;
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dhcpmsgs[0].options[length_index] = strlen(kOptionString);
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memcpy(&(dhcpmsgs[0].options[value_index]),
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kOptionString, strlen(kOptionString));
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}
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struct dhcp_message dhcpmsgs[2];
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size_t type_index;
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size_t length_index;
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size_t value_index;
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};
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TEST_F(DhcpcdGetOptionTest, OptionNotPresent) {
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// An entire option block of padding (all zeros).
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EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN));
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}
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TEST_F(DhcpcdGetOptionTest, TypeIsOffTheEnd) {
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type_index = sizeof(dhcpmsgs[0].options);
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PopulateTLV();
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EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN));
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}
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TEST_F(DhcpcdGetOptionTest, LengthIsOffTheEnd) {
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type_index = sizeof(dhcpmsgs[0].options) - 1;
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PopulateTLV();
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EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN));
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}
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TEST_F(DhcpcdGetOptionTest, ValueIsOffTheEnd) {
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type_index = sizeof(dhcpmsgs[0].options) - 2;
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PopulateTLV();
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EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN));
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}
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TEST_F(DhcpcdGetOptionTest, InsufficientSpaceForValue) {
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type_index = sizeof(dhcpmsgs[0].options) - 6;
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PopulateTLV();
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char* value = ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN);
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EXPECT_TRUE(NULL != value);
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EXPECT_EQ("host", ::std::string(value));
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free(value);
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}
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TEST_F(DhcpcdGetOptionTest, InsufficientSpaceForContinuedValue) {
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type_index = sizeof(dhcpmsgs[0].options) - 16;
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PopulateTLV();
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type_index = sizeof(dhcpmsgs[0].options) - 6;
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PopulateTLV();
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char* value = ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN);
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EXPECT_TRUE(NULL != value);
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EXPECT_EQ("hostnamehost", ::std::string(value));
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free(value);
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}
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