Oliver Smith | 3a9f267 | 2019-11-20 10:56:35 +0100 | [diff] [blame] | 1 | /* Copyright 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 2 | * |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU Affero General Public License as published by |
| 7 | * the Free Software Foundation; either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU Affero General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Affero General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <assert.h> |
| 21 | #include <stdbool.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <osmocom/core/select.h> |
| 25 | #include <osmocom/core/application.h> |
| 26 | #include <osmocom/hlr/logging.h> |
| 27 | #include <osmocom/mslookup/mslookup.h> |
| 28 | #include <osmocom/mslookup/mslookup_client.h> |
| 29 | #include <osmocom/mslookup/mslookup_client_mdns.h> |
| 30 | #include <osmocom/mslookup/mdns.h> |
| 31 | #include <osmocom/mslookup/mdns_sock.h> |
| 32 | |
| 33 | void *ctx = NULL; |
| 34 | |
| 35 | #define TEST_IP OSMO_MSLOOKUP_MDNS_IP4 |
| 36 | #define TEST_PORT OSMO_MSLOOKUP_MDNS_PORT |
| 37 | #define TEST_DOMAIN_SUFFIX "mslookup_client_mdns_test.dgsm.osmocom.org" |
| 38 | |
| 39 | /* |
| 40 | * Test server (emulates the mDNS server in OsmoHLR) and client |
| 41 | */ |
| 42 | struct osmo_mdns_sock *server_mc; |
| 43 | |
| 44 | |
| 45 | static void server_reply(struct osmo_mslookup_query *query, uint16_t packet_id) |
| 46 | { |
| 47 | struct osmo_mslookup_result result = {0}; |
| 48 | struct msgb *msg; |
| 49 | |
| 50 | result.rc = OSMO_MSLOOKUP_RC_RESULT; |
| 51 | result.age = 3; |
| 52 | osmo_sockaddr_str_from_str(&result.host_v4, "42.42.42.42", 444); |
| 53 | osmo_sockaddr_str_from_str(&result.host_v6, "1122:3344:5566:7788:99aa:bbcc:ddee:ff00", 666); |
| 54 | |
| 55 | msg = osmo_mdns_result_encode(ctx, packet_id, query, &result, TEST_DOMAIN_SUFFIX); |
| 56 | OSMO_ASSERT(msg); |
| 57 | OSMO_ASSERT(osmo_mdns_sock_send(server_mc, msg) == 0); |
| 58 | } |
| 59 | |
| 60 | static int server_recv(struct osmo_fd *osmo_fd, unsigned int what) |
| 61 | { |
| 62 | int n; |
| 63 | uint8_t buffer[1024]; |
| 64 | uint16_t packet_id; |
| 65 | struct osmo_mslookup_query *query; |
| 66 | |
| 67 | fprintf(stderr, "%s\n", __func__); |
| 68 | |
| 69 | /* Parse the message and print it */ |
| 70 | n = read(osmo_fd->fd, buffer, sizeof(buffer)); |
| 71 | OSMO_ASSERT(n >= 0); |
| 72 | |
| 73 | query = osmo_mdns_query_decode(ctx, buffer, n, &packet_id, TEST_DOMAIN_SUFFIX); |
| 74 | if (!query) |
| 75 | return -1; /* server receiving own answer is expected */ |
| 76 | |
| 77 | fprintf(stderr, "received request\n"); |
| 78 | server_reply(query, packet_id); |
| 79 | talloc_free(query); |
| 80 | return n; |
| 81 | } |
| 82 | |
| 83 | static void server_init() |
| 84 | { |
| 85 | fprintf(stderr, "%s\n", __func__); |
| 86 | server_mc = osmo_mdns_sock_init(ctx, TEST_IP, TEST_PORT, server_recv, NULL, 0); |
| 87 | OSMO_ASSERT(server_mc); |
| 88 | } |
| 89 | |
| 90 | static void server_stop() |
| 91 | { |
| 92 | fprintf(stderr, "%s\n", __func__); |
| 93 | OSMO_ASSERT(server_mc); |
| 94 | osmo_mdns_sock_cleanup(server_mc); |
| 95 | server_mc = NULL; |
| 96 | } |
| 97 | |
| 98 | struct osmo_mslookup_client* client; |
| 99 | struct osmo_mslookup_client_method* client_method; |
| 100 | |
| 101 | static void client_init() |
| 102 | { |
| 103 | fprintf(stderr, "%s\n", __func__); |
| 104 | client = osmo_mslookup_client_new(ctx); |
| 105 | OSMO_ASSERT(client); |
| 106 | client_method = osmo_mslookup_client_add_mdns(client, TEST_IP, TEST_PORT, 1337, TEST_DOMAIN_SUFFIX); |
| 107 | OSMO_ASSERT(client_method); |
| 108 | } |
| 109 | |
| 110 | static void client_recv(struct osmo_mslookup_client *client, uint32_t request_handle, |
| 111 | const struct osmo_mslookup_query *query, const struct osmo_mslookup_result *result) |
| 112 | { |
| 113 | char buf[256]; |
| 114 | fprintf(stderr, "%s\n", __func__); |
| 115 | fprintf(stderr, "client_recv(): %s\n", osmo_mslookup_result_name_b(buf, sizeof(buf), query, result)); |
| 116 | |
| 117 | osmo_mslookup_client_request_cancel(client, request_handle); |
| 118 | } |
| 119 | |
| 120 | static void client_query() |
| 121 | { |
| 122 | struct osmo_mslookup_id id = {.type = OSMO_MSLOOKUP_ID_IMSI, |
| 123 | .imsi = "123456789012345"}; |
| 124 | const struct osmo_mslookup_query query = { |
| 125 | .service = "gsup.hlr", |
| 126 | .id = id, |
| 127 | }; |
| 128 | struct osmo_mslookup_query_handling handling = { |
| 129 | .result_timeout_milliseconds = 2000, |
| 130 | .result_cb = client_recv, |
| 131 | }; |
| 132 | |
| 133 | fprintf(stderr, "%s\n", __func__); |
| 134 | osmo_mslookup_client_request(client, &query, &handling); |
| 135 | } |
| 136 | |
| 137 | static void client_stop() |
| 138 | { |
| 139 | fprintf(stderr, "%s\n", __func__); |
| 140 | osmo_mslookup_client_free(client); |
| 141 | client = NULL; |
| 142 | } |
| 143 | const struct timeval fake_time_start_time = { 0, 0 }; |
| 144 | |
| 145 | #define fake_time_passes(secs, usecs) do \ |
| 146 | { \ |
| 147 | struct timeval diff; \ |
| 148 | osmo_gettimeofday_override_add(secs, usecs); \ |
| 149 | osmo_clock_override_add(CLOCK_MONOTONIC, secs, usecs * 1000); \ |
| 150 | timersub(&osmo_gettimeofday_override_time, &fake_time_start_time, &diff); \ |
| 151 | LOGP(DMSLOOKUP, LOGL_DEBUG, "Total time passed: %d.%06d s\n", \ |
| 152 | (int)diff.tv_sec, (int)diff.tv_usec); \ |
| 153 | osmo_timers_prepare(); \ |
| 154 | osmo_timers_update(); \ |
| 155 | } while (0) |
| 156 | |
| 157 | static void fake_time_start() |
| 158 | { |
| 159 | struct timespec *clock_override; |
| 160 | |
| 161 | osmo_gettimeofday_override_time = fake_time_start_time; |
| 162 | osmo_gettimeofday_override = true; |
| 163 | clock_override = osmo_clock_override_gettimespec(CLOCK_MONOTONIC); |
| 164 | OSMO_ASSERT(clock_override); |
| 165 | clock_override->tv_sec = fake_time_start_time.tv_sec; |
| 166 | clock_override->tv_nsec = fake_time_start_time.tv_usec * 1000; |
| 167 | osmo_clock_override_enable(CLOCK_MONOTONIC, true); |
| 168 | fake_time_passes(0, 0); |
| 169 | } |
| 170 | static void test_server_client() |
| 171 | { |
| 172 | fprintf(stderr, "-- %s --\n", __func__); |
| 173 | server_init(); |
| 174 | client_init(); |
| 175 | client_query(); |
| 176 | |
| 177 | /* Let the server receive the query and indirectly call server_recv(). As side effect of using the same IP and |
| 178 | * port, the client will also receive its own question. The client will dismiss its own question, as it is just |
| 179 | * looking for answers. */ |
| 180 | OSMO_ASSERT(osmo_select_main_ctx(1) == 1); |
| 181 | |
| 182 | /* Let the mslookup client receive the answer (also same side effect as above). It does not call the callback |
| 183 | * (client_recv()) just yet, because it is waiting for the best result within two seconds. */ |
| 184 | OSMO_ASSERT(osmo_select_main_ctx(1) == 1); |
| 185 | |
| 186 | /* Time flies by, client_recv() gets called. */ |
| 187 | fake_time_passes(5, 0); |
| 188 | |
| 189 | server_stop(); |
| 190 | client_stop(); |
| 191 | } |
| 192 | |
| 193 | bool is_multicast_enabled() |
| 194 | { |
| 195 | bool ret = true; |
| 196 | struct addrinfo *ai; |
| 197 | int sock; |
| 198 | struct addrinfo hints = {0}; |
| 199 | struct ip_mreq multicast_req = {0}; |
| 200 | in_addr_t iface = INADDR_ANY; |
| 201 | |
| 202 | hints.ai_family = PF_UNSPEC; |
| 203 | hints.ai_socktype = SOCK_DGRAM; |
| 204 | hints.ai_flags = (AI_PASSIVE | AI_NUMERICHOST); |
| 205 | assert(getaddrinfo("239.192.23.42", "4266", &hints, &ai) == 0); |
| 206 | |
| 207 | sock = socket(ai->ai_family, ai->ai_socktype, 0); |
| 208 | assert(sock != -1); |
| 209 | assert(setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, (char*)&iface, sizeof(iface)) != -1); |
| 210 | |
| 211 | memcpy(&multicast_req.imr_multiaddr, &((struct sockaddr_in*)(ai->ai_addr))->sin_addr, |
| 212 | sizeof(multicast_req.imr_multiaddr)); |
| 213 | multicast_req.imr_interface.s_addr = htonl(INADDR_ANY); |
| 214 | |
| 215 | if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&multicast_req, sizeof(multicast_req)) == -1) |
| 216 | ret = false; |
| 217 | |
| 218 | freeaddrinfo(ai); |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Run all tests |
| 224 | */ |
| 225 | int main() |
| 226 | { |
| 227 | if (!is_multicast_enabled()) { |
| 228 | fprintf(stderr, "WARNING: multicast is disabled, skipping the test! (OS#4361)"); |
| 229 | return 77; |
| 230 | } |
| 231 | |
| 232 | talloc_enable_null_tracking(); |
| 233 | ctx = talloc_named_const(NULL, 0, "main"); |
| 234 | osmo_init_logging2(ctx, NULL); |
| 235 | |
| 236 | log_set_print_filename(osmo_stderr_target, 0); |
| 237 | log_set_print_level(osmo_stderr_target, 0); |
| 238 | log_set_print_category(osmo_stderr_target, 0); |
| 239 | log_set_print_category_hex(osmo_stderr_target, 0); |
| 240 | log_set_use_color(osmo_stderr_target, 0); |
| 241 | log_set_category_filter(osmo_stderr_target, DMSLOOKUP, true, LOGL_DEBUG); |
| 242 | |
| 243 | fake_time_start(); |
| 244 | |
| 245 | test_server_client(); |
| 246 | |
| 247 | log_fini(); |
| 248 | |
| 249 | OSMO_ASSERT(talloc_total_blocks(ctx) == 1); |
| 250 | talloc_free(ctx); |
| 251 | OSMO_ASSERT(talloc_total_blocks(NULL) == 1); |
| 252 | talloc_disable_null_tracking(); |
| 253 | |
| 254 | return 0; |
| 255 | } |