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systemd/src/libsystemd-network/test-dhcp-server.c
T
Yu Watanabe 809da721f0 sd-dhcp-server: propagate error on parsing DHCP packet 
Otherwise, we silently ignore the received packet and that makes hard to
debug issue.
2023-08-09 05:33:24 +09:00

331 lines
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C
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
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(bool bind_to_interface) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
struct in_addr address_lo = {
.s_addr = htobe32(INADDR_LOOPBACK),
};
struct in_addr address_any = {
.s_addr = htobe32(INADDR_ANY),
};
int r;
log_debug("/* %s(bind_to_interface=%s) */", __func__, yes_no(bind_to_interface));
assert_se(sd_event_new(&event) >= 0);
/* attach to loopback interface */
assert_se(sd_dhcp_server_new(&server, 1) >= 0);
assert_se(server);
server->bind_to_interface = bind_to_interface;
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 r;
assert_se(r >= 0);
assert_se(sd_dhcp_server_start(server) >= 0);
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;
struct {
uint8_t code;
uint8_t length;
uint8_t hostname[6];
} _packed_ option_hostname;
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,
.option_hostname.code = SD_DHCP_OPTION_HOST_NAME,
.option_hostname.length = 6,
.option_hostname.hostname = { 'T', 'E', 'S', 'T', 'H', 'N' },
.end = SD_DHCP_OPTION_END,
};
struct in_addr address_lo = {
.s_addr = htobe32(INADDR_LOOPBACK),
};
struct in_addr static_lease_address = {
.s_addr = htobe32(INADDR_LOOPBACK + 42),
};
static uint8_t static_lease_client_id[7] = {0x01, 'A', 'B', 'C', 'D', 'E', 'G' };
log_debug("/* %s */", __func__);
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_set_static_lease(server, &static_lease_address, static_lease_client_id,
ELEMENTSOF(static_lease_client_id)) >= 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)) == -ENOMSG);
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)) == DHCP_OFFER);
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)) == -EBADMSG);
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);
/* request address reserved for static lease (unmatching client ID) */
test.option_client_id.id[6] = 'H';
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 42);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
/* request unmatching address */
test.option_client_id.id[6] = 'G';
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 41);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == 0);
/* request matching address */
test.option_client_id.id[6] = 'G';
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 42);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_ACK);
/* try again */
test.option_client_id.id[6] = 'G';
test.option_requested_ip.address = htobe32(INADDR_LOOPBACK + 42);
assert_se(dhcp_server_handle_message(server, (DHCPMessage*)&test, sizeof(test)) == DHCP_ACK);
}
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',
};
log_debug("/* %s */", __func__);
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);
}
static void test_static_lease(void) {
_cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL;
log_debug("/* %s */", __func__);
assert_se(sd_dhcp_server_new(&server, 1) >= 0);
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020304 },
(uint8_t*) &(uint32_t) { 0x01020304 }, sizeof(uint32_t)) >= 0);
/* Duplicated entry. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020304 },
(uint8_t*) &(uint32_t) { 0x01020304 }, sizeof(uint32_t)) == -EEXIST);
/* Address is conflicted. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020304 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) == -EEXIST);
/* Client ID is conflicted. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020305 },
(uint8_t*) &(uint32_t) { 0x01020304 }, sizeof(uint32_t)) == -EEXIST);
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020305 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) >= 0);
/* Remove the previous entry. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x00000000 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) >= 0);
/* Then, set a different address. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x01020306 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) >= 0);
/* Remove again. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x00000000 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) >= 0);
/* Try to remove non-existent entry. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x00000000 },
(uint8_t*) &(uint32_t) { 0x01020305 }, sizeof(uint32_t)) >= 0);
/* Try to remove non-existent entry. */
assert_se(sd_dhcp_server_set_static_lease(server, &(struct in_addr) { .s_addr = 0x00000000 },
(uint8_t*) &(uint32_t) { 0x01020306 }, sizeof(uint32_t)) >= 0);
}
int main(int argc, char *argv[]) {
int r;
test_setup_logging(LOG_DEBUG);
test_client_id_hash();
test_static_lease();
r = test_basic(true);
if (r < 0)
return log_tests_skipped_errno(r, "cannot start dhcp server(bound to interface)");
r = test_basic(false);
if (r < 0)
return log_tests_skipped_errno(r, "cannot start dhcp server(non-bound to interface)");
test_message_handler();
return 0;
}
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