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Systemd/src/libsystemd-network/test-dhcp-server.c
Lennart Poettering ddb82ec2a2 sd-dhcp: clean-up of DHCP lease server code 
This is an attempt to clean-up the DHCP lease server type code a bit. We
now strictly use the same enum everywhere, and store server info in an
array. Moreover, we use the same nomenclature everywhere.

This only makes the changes in the sd-dhcp code. The networkd code is
untouched so far (but should be fixed up like this too. But it's more
complicated since this would then touch actual settings in .network
files).

Note that this also changes some field names in serialized lease files.
But given that these field names have not been part of a released
version of systemd yet, such a change should be ok.

This is pure renaming/refactoring, shouldn't actually change any
behaviour.
2020-05-30 14:18:43 +02:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2013 Intel Corporation. All rights reserved.
***/
#include <errno.h>
#include <net/if_arp.h>
#include "sd-dhcp-server.h"
#include "sd-event.h"
#include "dhcp-server-internal.h"
#include "tests.h"
static void test_pool(struct in_addr *address, unsigned size, int ret) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
assert_se(sd_dhcp_server_new(&server, 1) >= 0);
assert_se(sd_dhcp_server_configure_pool(server, address, 8, 0, size) == ret);
}
static int test_basic(sd_event *event) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
struct in_addr address_lo = {
.s_addr = htonl(INADDR_LOOPBACK),
};
struct in_addr address_any = {
.s_addr = htonl(INADDR_ANY),
};
int r;
/* attach to loopback interface */
assert_se(sd_dhcp_server_new(&server, 1) >= 0);
assert_se(server);
assert_se(sd_dhcp_server_attach_event(server, event, 0) >= 0);
assert_se(sd_dhcp_server_attach_event(server, event, 0) == -EBUSY);
assert_se(sd_dhcp_server_get_event(server) == event);
assert_se(sd_dhcp_server_detach_event(server) >= 0);
assert_se(!sd_dhcp_server_get_event(server));
assert_se(sd_dhcp_server_attach_event(server, NULL, 0) >= 0);
assert_se(sd_dhcp_server_attach_event(server, NULL, 0) == -EBUSY);
assert_se(sd_dhcp_server_ref(server) == server);
assert_se(!sd_dhcp_server_unref(server));
assert_se(sd_dhcp_server_start(server) == -EUNATCH);
assert_se(sd_dhcp_server_configure_pool(server, &address_any, 28, 0, 0) == -EINVAL);
assert_se(sd_dhcp_server_configure_pool(server, &address_lo, 38, 0, 0) == -ERANGE);
assert_se(sd_dhcp_server_configure_pool(server, &address_lo, 8, 0, 0) >= 0);
assert_se(sd_dhcp_server_configure_pool(server, &address_lo, 8, 0, 0) >= 0);
test_pool(&address_any, 1, -EINVAL);
test_pool(&address_lo, 1, 0);
r = sd_dhcp_server_start(server);
if (r == -EPERM)
return log_info_errno(r, "sd_dhcp_server_start failed: %m");
assert_se(r >= 0);
assert_se(sd_dhcp_server_start(server) == -EBUSY);
assert_se(sd_dhcp_server_stop(server) >= 0);
assert_se(sd_dhcp_server_stop(server) >= 0);
assert_se(sd_dhcp_server_start(server) >= 0);
return 0;
}
static void test_message_handler(void) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
struct {
DHCPMessage message;
struct {
uint8_t code;
uint8_t length;
uint8_t type;
} _packed_ option_type;
struct {
uint8_t code;
uint8_t length;
be32_t address;
} _packed_ option_requested_ip;
struct {
uint8_t code;
uint8_t length;
be32_t address;
} _packed_ option_server_id;
struct {
uint8_t code;
uint8_t length;
uint8_t id[7];
} _packed_ option_client_id;
uint8_t end;
} _packed_ test = {
.message.op = BOOTREQUEST,
.message.htype = ARPHRD_ETHER,
.message.hlen = ETHER_ADDR_LEN,
.message.xid = htobe32(0x12345678),
.message.chaddr = { 'A', 'B', 'C', 'D', 'E', 'F' },
.option_type.code = SD_DHCP_OPTION_MESSAGE_TYPE,
.option_type.length = 1,
.option_type.type = DHCP_DISCOVER,
.end = SD_DHCP_OPTION_END,
};
struct in_addr address_lo = {
.s_addr = htonl(INADDR_LOOPBACK),
};
assert_se(sd_dhcp_server_new(&server, 1) >= 0);
assert_se(sd_dhcp_server_configure_pool(server, &address_lo, 8, 0, 0) >= 0);
assert_se(sd_dhcp_server_attach_event(server, NULL, 0) >= 0);
assert_se(sd_dhcp_server_start(server) >= 0);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.end = 0;
/* TODO, shouldn't this fail? */
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.end = SD_DHCP_OPTION_END;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.option_type.code = 0;
test.option_type.length = 0;
test.option_type.type = 0;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.option_type.code = SD_DHCP_OPTION_MESSAGE_TYPE;
test.option_type.length = 1;
test.option_type.type = DHCP_DISCOVER;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.message.op = 0;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.message.op = BOOTREQUEST;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.message.htype = 0;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.message.htype = ARPHRD_ETHER;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.message.hlen = 0;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.message.hlen = ETHER_ADDR_LEN;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_OFFER);
test.option_type.type = DHCP_REQUEST;
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.option_requested_ip.code = SD_DHCP_OPTION_REQUESTED_IP_ADDRESS;
test.option_requested_ip.length = 4;
test.option_requested_ip.address = htobe32(0x12345678);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_NAK);
test.option_server_id.code = SD_DHCP_OPTION_SERVER_IDENTIFIER;
test.option_server_id.length = 4;
test.option_server_id.address = htobe32(INADDR_LOOPBACK);
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 3);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_ACK);
test.option_server_id.address = htobe32(0x12345678);
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 3);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.option_server_id.address = htobe32(INADDR_LOOPBACK);
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 4);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 3);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_ACK);
test.option_client_id.code = SD_DHCP_OPTION_CLIENT_IDENTIFIER;
test.option_client_id.length = 7;
test.option_client_id.id[0] = 0x01;
test.option_client_id.id[1] = 'A';
test.option_client_id.id[2] = 'B';
test.option_client_id.id[3] = 'C';
test.option_client_id.id[4] = 'D';
test.option_client_id.id[5] = 'E';
test.option_client_id.id[6] = 'F';
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_ACK);
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 30);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
}
static uint64_t client_id_hash_helper(DHCPClientId *id, uint8_t key[HASH_KEY_SIZE]) {
struct siphash state;
siphash24_init(&state, key);
client_id_hash_func(id, &state);
return htole64(siphash24_finalize(&state));
}
static void test_client_id_hash(void) {
DHCPClientId a = {
.length = 4,
}, b = {
.length = 4,
};
uint8_t hash_key[HASH_KEY_SIZE] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
};
a.data = (uint8_t*)strdup("abcd");
b.data = (uint8_t*)strdup("abcd");
assert_se(client_id_compare_func(&a, &b) == 0);
assert_se(client_id_hash_helper(&a, hash_key) == client_id_hash_helper(&b, hash_key));
a.length = 3;
assert_se(client_id_compare_func(&a, &b) != 0);
a.length = 4;
assert_se(client_id_compare_func(&a, &b) == 0);
assert_se(client_id_hash_helper(&a, hash_key) == client_id_hash_helper(&b, hash_key));
b.length = 3;
assert_se(client_id_compare_func(&a, &b) != 0);
b.length = 4;
assert_se(client_id_compare_func(&a, &b) == 0);
assert_se(client_id_hash_helper(&a, hash_key) == client_id_hash_helper(&b, hash_key));
free(b.data);
b.data = (uint8_t*)strdup("abce");
assert_se(client_id_compare_func(&a, &b) != 0);
free(a.data);
free(b.data);
}
int main(int argc, char *argv[]) {
_cleanup_(sd_event_unrefp) sd_event *e;
int r;
test_setup_logging(LOG_DEBUG);
assert_se(sd_event_new(&e) >= 0);
r = test_basic(e);
if (r != 0)
return log_tests_skipped("cannot start dhcp server");
test_message_handler();
test_client_id_hash();
return 0;
}
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