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test-dhcp-option.c
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test-dhcp-option.c
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <net/if_arp.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "alloc-util.h"
#include "dhcp-internal.h"
#include "dhcp-protocol.h"
#include "macro.h"
#include "memory-util.h"
struct option_desc {
uint8_t sname[64];
int snamelen;
uint8_t file[128];
int filelen;
uint8_t options[128];
int len;
bool success;
int filepos;
int snamepos;
int pos;
};
static bool verbose = false;
static struct option_desc option_tests[] = {
{ {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69 }, 7, false, },
{ {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69, 0, 0,
SD_DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 12, true, },
{ {}, 0, {}, 0, { 8, 255, 70, 71, 72 }, 5, false, },
{ {}, 0, {}, 0, { 0x35, 0x01, 0x05, 0x36, 0x04, 0x01, 0x00, 0xa8,
0xc0, 0x33, 0x04, 0x00, 0x01, 0x51, 0x80, 0x01,
0x04, 0xff, 0xff, 0xff, 0x00, 0x03, 0x04, 0xc0,
0xa8, 0x00, 0x01, 0x06, 0x04, 0xc0, 0xa8, 0x00,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
40, true, },
{ {}, 0, {}, 0, { SD_DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_OFFER,
42, 3, 0, 0, 0 }, 8, true, },
{ {}, 0, {}, 0, { 42, 2, 1, 2, 44 }, 5, false, },
{ {}, 0,
{ 222, 3, 1, 2, 3, SD_DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_NAK }, 8,
{ SD_DHCP_OPTION_OVERLOAD, 1, DHCP_OVERLOAD_FILE }, 3, true, },
{ { 1, 4, 1, 2, 3, 4, SD_DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 9,
{ 222, 3, 1, 2, 3 }, 5,
{ SD_DHCP_OPTION_OVERLOAD, 1,
DHCP_OVERLOAD_FILE|DHCP_OVERLOAD_SNAME }, 3, true, },
};
static const char *dhcp_type(int type) {
switch(type) {
case DHCP_DISCOVER:
return "DHCPDISCOVER";
case DHCP_OFFER:
return "DHCPOFFER";
case DHCP_REQUEST:
return "DHCPREQUEST";
case DHCP_DECLINE:
return "DHCPDECLINE";
case DHCP_ACK:
return "DHCPACK";
case DHCP_NAK:
return "DHCPNAK";
case DHCP_RELEASE:
return "DHCPRELEASE";
default:
return "unknown";
}
}
static void test_invalid_buffer_length(void) {
DHCPMessage message;
assert_se(dhcp_option_parse(&message, 0, NULL, NULL, NULL) == -EINVAL);
assert_se(dhcp_option_parse(&message, sizeof(DHCPMessage) - 1, NULL, NULL, NULL) == -EINVAL);
}
static void test_message_init(void) {
_cleanup_free_ DHCPMessage *message = NULL;
size_t optlen = 4, optoffset;
size_t len = sizeof(DHCPMessage) + optlen;
uint8_t *magic;
message = malloc0(len);
assert_se(dhcp_message_init(message, BOOTREQUEST, 0x12345678,
DHCP_DISCOVER, ARPHRD_ETHER, optlen, &optoffset) >= 0);
assert_se(message->xid == htobe32(0x12345678));
assert_se(message->op == BOOTREQUEST);
magic = (uint8_t*)&message->magic;
assert_se(magic[0] == 99);
assert_se(magic[1] == 130);
assert_se(magic[2] == 83);
assert_se(magic[3] == 99);
assert_se(dhcp_option_parse(message, len, NULL, NULL, NULL) >= 0);
}
static DHCPMessage *create_message(uint8_t *options, uint16_t optlen,
uint8_t *file, uint8_t filelen,
uint8_t *sname, uint8_t snamelen) {
DHCPMessage *message;
size_t len = sizeof(DHCPMessage) + optlen;
message = malloc0(len);
assert_se(message);
memcpy_safe(&message->options, options, optlen);
memcpy_safe(&message->file, file, filelen);
memcpy_safe(&message->sname, sname, snamelen);
return message;
}
static void test_ignore_opts(uint8_t *descoption, int *descpos, int *desclen) {
assert(*descpos >= 0);
while (*descpos < *desclen) {
switch(descoption[*descpos]) {
case SD_DHCP_OPTION_PAD:
*descpos += 1;
break;
case SD_DHCP_OPTION_MESSAGE_TYPE:
case SD_DHCP_OPTION_OVERLOAD:
*descpos += 3;
break;
default:
return;
}
}
}
static int test_options_cb(uint8_t code, uint8_t len, const void *option, void *userdata) {
struct option_desc *desc = userdata;
uint8_t *descoption = NULL;
int *desclen = NULL, *descpos = NULL;
uint8_t optcode = 0;
uint8_t optlen = 0;
uint8_t i;
assert_se((!desc && !code && !len) || desc);
if (!desc)
return -EINVAL;
assert_se(code != SD_DHCP_OPTION_PAD);
assert_se(code != SD_DHCP_OPTION_END);
assert_se(code != SD_DHCP_OPTION_MESSAGE_TYPE);
assert_se(code != SD_DHCP_OPTION_OVERLOAD);
while (desc->pos >= 0 || desc->filepos >= 0 || desc->snamepos >= 0) {
if (desc->pos >= 0) {
descoption = &desc->options[0];
desclen = &desc->len;
descpos = &desc->pos;
} else if (desc->filepos >= 0) {
descoption = &desc->file[0];
desclen = &desc->filelen;
descpos = &desc->filepos;
} else if (desc->snamepos >= 0) {
descoption = &desc->sname[0];
desclen = &desc->snamelen;
descpos = &desc->snamepos;
}
assert_se(descoption && desclen && descpos);
if (*desclen)
test_ignore_opts(descoption, descpos, desclen);
if (*descpos < *desclen)
break;
if (*descpos == *desclen)
*descpos = -1;
}
assert_se(descpos);
assert_se(*descpos != -1);
optcode = descoption[*descpos];
optlen = descoption[*descpos + 1];
if (verbose)
printf("DHCP code %2d(%2d) len %2d(%2d) ", code, optcode,
len, optlen);
assert_se(code == optcode);
assert_se(len == optlen);
for (i = 0; i < len; i++) {
if (verbose)
printf("0x%02x(0x%02x) ", ((uint8_t*) option)[i],
descoption[*descpos + 2 + i]);
assert_se(((uint8_t*) option)[i] == descoption[*descpos + 2 + i]);
}
if (verbose)
printf("\n");
*descpos += optlen + 2;
test_ignore_opts(descoption, descpos, desclen);
if (desc->pos != -1 && desc->pos == desc->len)
desc->pos = -1;
if (desc->filepos != -1 && desc->filepos == desc->filelen)
desc->filepos = -1;
if (desc->snamepos != -1 && desc->snamepos == desc->snamelen)
desc->snamepos = -1;
return 0;
}
static void test_options(struct option_desc *desc) {
uint8_t *options = NULL;
uint8_t *file = NULL;
uint8_t *sname = NULL;
int optlen = 0;
int filelen = 0;
int snamelen = 0;
int buflen = 0;
_cleanup_free_ DHCPMessage *message = NULL;
int res;
if (desc) {
file = &desc->file[0];
filelen = desc->filelen;
if (!filelen)
desc->filepos = -1;
sname = &desc->sname[0];
snamelen = desc->snamelen;
if (!snamelen)
desc->snamepos = -1;
options = &desc->options[0];
optlen = desc->len;
desc->pos = 0;
}
message = create_message(options, optlen, file, filelen,
sname, snamelen);
buflen = sizeof(DHCPMessage) + optlen;
if (!desc) {
assert_se((res = dhcp_option_parse(message, buflen, test_options_cb, NULL, NULL)) == -ENOMSG);
} else if (desc->success) {
assert_se((res = dhcp_option_parse(message, buflen, test_options_cb, desc, NULL)) >= 0);
assert_se(desc->pos == -1 && desc->filepos == -1 && desc->snamepos == -1);
} else
assert_se((res = dhcp_option_parse(message, buflen, test_options_cb, desc, NULL)) < 0);
if (verbose)
printf("DHCP type %s\n", dhcp_type(res));
}
static void test_option_removal(struct option_desc *desc) {
_cleanup_free_ DHCPMessage *message = create_message(&desc->options[0], desc->len, NULL, 0, NULL, 0);
assert_se(dhcp_option_parse(message, sizeof(DHCPMessage) + desc->len, NULL, NULL, NULL) >= 0);
assert_se((desc->len = dhcp_option_remove_option(message->options, desc->len, SD_DHCP_OPTION_MESSAGE_TYPE)) >= 0);
assert_se(dhcp_option_parse(message, sizeof(DHCPMessage) + desc->len, NULL, NULL, NULL) < 0);
}
static uint8_t options[64] = {
'A', 'B', 'C', 'D',
160, 2, 0x11, 0x12,
0,
31, 8, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0,
55, 3, 0x51, 0x52, 0x53,
17, 7, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
255
};
static void test_option_set(void) {
_cleanup_free_ DHCPMessage *result = NULL;
size_t offset = 0, len, pos;
unsigned i;
result = malloc0(sizeof(DHCPMessage) + 11);
assert_se(result);
result->options[0] = 'A';
result->options[1] = 'B';
result->options[2] = 'C';
result->options[3] = 'D';
assert_se(dhcp_option_append(result, 0, &offset, 0, SD_DHCP_OPTION_PAD,
0, NULL) == -ENOBUFS);
assert_se(offset == 0);
offset = 4;
assert_se(dhcp_option_append(result, 5, &offset, 0, SD_DHCP_OPTION_PAD,
0, NULL) == -ENOBUFS);
assert_se(offset == 4);
assert_se(dhcp_option_append(result, 6, &offset, 0, SD_DHCP_OPTION_PAD,
0, NULL) >= 0);
assert_se(offset == 5);
offset = pos = 4;
len = 11;
while (pos < len && options[pos] != SD_DHCP_OPTION_END) {
assert_se(dhcp_option_append(result, len, &offset, DHCP_OVERLOAD_SNAME,
options[pos],
options[pos + 1],
&options[pos + 2]) >= 0);
if (options[pos] == SD_DHCP_OPTION_PAD)
pos++;
else
pos += 2 + options[pos + 1];
if (pos < len)
assert_se(offset == pos);
}
for (i = 0; i < 9; i++) {
if (verbose)
printf("%2u: 0x%02x(0x%02x) (options)\n", i, result->options[i],
options[i]);
assert_se(result->options[i] == options[i]);
}
if (verbose)
printf("%2d: 0x%02x(0x%02x) (options)\n", 9, result->options[9],
SD_DHCP_OPTION_END);
assert_se(result->options[9] == SD_DHCP_OPTION_END);
if (verbose)
printf("%2d: 0x%02x(0x%02x) (options)\n", 10, result->options[10],
SD_DHCP_OPTION_PAD);
assert_se(result->options[10] == SD_DHCP_OPTION_PAD);
for (i = 0; i < pos - 8; i++) {
if (verbose)
printf("%2u: 0x%02x(0x%02x) (sname)\n", i, result->sname[i],
options[i + 9]);
assert_se(result->sname[i] == options[i + 9]);
}
if (verbose)
printf ("\n");
}
int main(int argc, char *argv[]) {
unsigned i;
test_invalid_buffer_length();
test_message_init();
test_options(NULL);
for (i = 0; i < ELEMENTSOF(option_tests); i++)
test_options(&option_tests[i]);
test_option_set();
for (i = 0; i < ELEMENTSOF(option_tests); i++) {
struct option_desc *desc = &option_tests[i];
if (!desc->success || desc->snamelen > 0 || desc->filelen > 0)
continue;
test_option_removal(desc);
}
return 0;
}