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Diffstat (limited to 'dhcpcd_test.cpp')
| -rw-r--r-- | dhcpcd_test.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/dhcpcd_test.cpp b/dhcpcd_test.cpp new file mode 100644 index 0000000..1fa829f --- /dev/null +++ b/dhcpcd_test.cpp @@ -0,0 +1,146 @@ +/* + * Copyright 2014 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * dhcpcd_test.cpp - unit tests for dhcpcd + */ + +#include <stdint.h> +#include <stdlib.h> +#include <string> + +#include <gtest/gtest.h> + +// For convenience. +#define ARRAYSIZE(x) sizeof((x)) / sizeof((x)[0]) + +// Regrettably, copy these defines and the dhcp_message structure in from +// dhcp.h. This header file is not easily included, since subsequent +// includes use C++ reserved keywords (like "new") as structure member names. +extern "C" { + +#define DHO_PAD 0 +#define DHO_DNSDOMAIN 15 + +/* Max MTU - defines dhcp option length */ +#define MTU_MAX 1500 + +/* Sizes for DHCP options */ +#define DHCP_CHADDR_LEN 16 +#define SERVERNAME_LEN 64 +#define BOOTFILE_LEN 128 +#define DHCP_UDP_LEN (14 + 20 + 8) +#define DHCP_FIXED_LEN (DHCP_UDP_LEN + 226) +#define DHCP_OPTION_LEN (MTU_MAX - DHCP_FIXED_LEN) + +/* Some crappy DHCP servers require the BOOTP minimum length */ +#define BOOTP_MESSAGE_LENTH_MIN 300 + +struct dhcp_message { + uint8_t op; /* message type */ + uint8_t hwtype; /* hardware address type */ + uint8_t hwlen; /* hardware address length */ + uint8_t hwopcount; /* should be zero in client message */ + uint32_t xid; /* transaction id */ + uint16_t secs; /* elapsed time in sec. from boot */ + uint16_t flags; + uint32_t ciaddr; /* (previously allocated) client IP */ + uint32_t yiaddr; /* 'your' client IP address */ + uint32_t siaddr; /* should be zero in client's messages */ + uint32_t giaddr; /* should be zero in client's messages */ + uint8_t chaddr[DHCP_CHADDR_LEN]; /* client's hardware address */ + uint8_t servername[SERVERNAME_LEN]; /* server host name */ + uint8_t bootfile[BOOTFILE_LEN]; /* boot file name */ + uint32_t cookie; + uint8_t options[DHCP_OPTION_LEN]; /* message options - cookie */ +} _packed; + +char * get_option_string(const struct dhcp_message *dhcp, uint8_t option); + +} + + +static const char kOptionString[] = "hostname"; + +class DhcpcdGetOptionTest : public ::testing::Test { + protected: + virtual void SetUp() { + memset(dhcpmsgs, 0, ARRAYSIZE(dhcpmsgs) * sizeof(struct dhcp_message)); + // Technically redundant. + memset(&(dhcpmsgs[0].options), DHO_PAD, sizeof(dhcpmsgs[0].options)); + + type_index = 0; + length_index = 0; + value_index = 0; + } + + void PopulateTLV() { + // May very well write off the end of the first struct dhcp_message, + // by design. + length_index = type_index + 1; + value_index = length_index + 1; + dhcpmsgs[0].options[type_index] = DHO_DNSDOMAIN; + dhcpmsgs[0].options[length_index] = strlen(kOptionString); + memcpy(&(dhcpmsgs[0].options[value_index]), + kOptionString, strlen(kOptionString)); + } + + struct dhcp_message dhcpmsgs[2]; + size_t type_index; + size_t length_index; + size_t value_index; +}; + +TEST_F(DhcpcdGetOptionTest, OptionNotPresent) { + // An entire option block of padding (all zeros). + EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN)); +} + +TEST_F(DhcpcdGetOptionTest, TypeIsOffTheEnd) { + type_index = sizeof(dhcpmsgs[0].options); + PopulateTLV(); + EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN)); +} + +TEST_F(DhcpcdGetOptionTest, LengthIsOffTheEnd) { + type_index = sizeof(dhcpmsgs[0].options) - 1; + PopulateTLV(); + EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN)); +} + +TEST_F(DhcpcdGetOptionTest, ValueIsOffTheEnd) { + type_index = sizeof(dhcpmsgs[0].options) - 2; + PopulateTLV(); + EXPECT_EQ(NULL, ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN)); +} + +TEST_F(DhcpcdGetOptionTest, InsufficientSpaceForValue) { + type_index = sizeof(dhcpmsgs[0].options) - 6; + PopulateTLV(); + char* value = ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN); + EXPECT_TRUE(NULL != value); + EXPECT_EQ("host", ::std::string(value)); + free(value); +} + +TEST_F(DhcpcdGetOptionTest, InsufficientSpaceForContinuedValue) { + type_index = sizeof(dhcpmsgs[0].options) - 16; + PopulateTLV(); + type_index = sizeof(dhcpmsgs[0].options) - 6; + PopulateTLV(); + char* value = ::get_option_string(&(dhcpmsgs[0]), DHO_DNSDOMAIN); + EXPECT_TRUE(NULL != value); + EXPECT_EQ("hostnamehost", ::std::string(value)); + free(value); +} |