src/libsystemd/sd-netlink/test-netlink.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <net/if.h>
  23 #include <netinet/ether.h>
  24
  25 #include "sd-netlink.h"
  26
  27 #include "event-util.h"
  28 #include "macro.h"
  29 #include "missing.h"
  30 #include "netlink-util.h"
  31 #include "socket-util.h"
  32 #include "string-util.h"
  33 #include "util.h"
  34
  35 static void test_message_link_bridge(sd_netlink *rtnl) {
  36         _cleanup_netlink_message_unref_ sd_netlink_message *message = NULL;
  37         uint32_t cost;
  38
  39         assert_se(sd_rtnl_message_new_link(rtnl, &message, RTM_NEWLINK, 1) >= 0);
  40         assert_se(sd_rtnl_message_link_set_family(message, PF_BRIDGE) >= 0);
  41         assert_se(sd_netlink_message_open_container(message, IFLA_PROTINFO) >= 0);
  42         assert_se(sd_netlink_message_append_u32(message, IFLA_BRPORT_COST, 10) >= 0);
  43         assert_se(sd_netlink_message_close_container(message) >= 0);
  44
  45         assert_se(sd_netlink_message_rewind(message) >= 0);
  46
  47         assert_se(sd_netlink_message_enter_container(message, IFLA_PROTINFO) >= 0);
  48         assert_se(sd_netlink_message_read_u32(message, IFLA_BRPORT_COST, &cost) >= 0);
  49         assert_se(cost == 10);
  50         assert_se(sd_netlink_message_exit_container(message) >= 0);
  51 }
  52
  53 static void test_link_configure(sd_netlink *rtnl, int ifindex) {
  54         _cleanup_netlink_message_unref_ sd_netlink_message *message = NULL;
  55         const char *mac = "98:fe:94:3f:c6:18", *name = "test";
  56         char buffer[ETHER_ADDR_TO_STRING_MAX];
  57         unsigned int mtu = 1450, mtu_out;
  58         const char *name_out;
  59         struct ether_addr mac_out;
  60
  61         /* we'd really like to test NEWLINK, but let's not mess with the running kernel */
  62         assert_se(sd_rtnl_message_new_link(rtnl, &message, RTM_GETLINK, ifindex) >= 0);
  63         assert_se(sd_netlink_message_append_string(message, IFLA_IFNAME, name) >= 0);
  64         assert_se(sd_netlink_message_append_ether_addr(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
  65         assert_se(sd_netlink_message_append_u32(message, IFLA_MTU, mtu) >= 0);
  66
  67         assert_se(sd_netlink_call(rtnl, message, 0, NULL) == 1);
  68         assert_se(sd_netlink_message_rewind(message) >= 0);
  69
  70         assert_se(sd_netlink_message_read_string(message, IFLA_IFNAME, &name_out) >= 0);
  71         assert_se(streq(name, name_out));
  72
  73         assert_se(sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &mac_out) >= 0);
  74         assert_se(streq(mac, ether_addr_to_string(&mac_out, buffer)));
  75
  76         assert_se(sd_netlink_message_read_u32(message, IFLA_MTU, &mtu_out) >= 0);
  77         assert_se(mtu == mtu_out);
  78 }
  79
  80 static void test_link_get(sd_netlink *rtnl, int ifindex) {
  81         sd_netlink_message *m;
  82         sd_netlink_message *r;
  83         unsigned int mtu = 1500;
  84         const char *str_data;
  85         uint8_t u8_data;
  86         uint32_t u32_data;
  87         struct ether_addr eth_data;
  88
  89         assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
  90         assert_se(m);
  91
  92         /* u8 test cases  */
  93         assert_se(sd_netlink_message_append_u8(m, IFLA_CARRIER, 0) >= 0);
  94         assert_se(sd_netlink_message_append_u8(m, IFLA_OPERSTATE, 0) >= 0);
  95         assert_se(sd_netlink_message_append_u8(m, IFLA_LINKMODE, 0) >= 0);
  96
  97         /* u32 test cases */
  98         assert_se(sd_netlink_message_append_u32(m, IFLA_MTU, mtu) >= 0);
  99         assert_se(sd_netlink_message_append_u32(m, IFLA_GROUP, 0) >= 0);
 100         assert_se(sd_netlink_message_append_u32(m, IFLA_TXQLEN, 0) >= 0);
 101         assert_se(sd_netlink_message_append_u32(m, IFLA_NUM_TX_QUEUES, 0) >= 0);
 102         assert_se(sd_netlink_message_append_u32(m, IFLA_NUM_RX_QUEUES, 0) >= 0);
 103
 104         assert_se(sd_netlink_call(rtnl, m, -1, &r) == 1);
 105
 106         assert_se(sd_netlink_message_read_string(r, IFLA_IFNAME, &str_data) == 0);
 107
 108         assert_se(sd_netlink_message_read_u8(r, IFLA_CARRIER, &u8_data) == 0);
 109         assert_se(sd_netlink_message_read_u8(r, IFLA_OPERSTATE, &u8_data) == 0);
 110         assert_se(sd_netlink_message_read_u8(r, IFLA_LINKMODE, &u8_data) == 0);
 111
 112         assert_se(sd_netlink_message_read_u32(r, IFLA_MTU, &u32_data) == 0);
 113         assert_se(sd_netlink_message_read_u32(r, IFLA_GROUP, &u32_data) == 0);
 114         assert_se(sd_netlink_message_read_u32(r, IFLA_TXQLEN, &u32_data) == 0);
 115         assert_se(sd_netlink_message_read_u32(r, IFLA_NUM_TX_QUEUES, &u32_data) == 0);
 116         assert_se(sd_netlink_message_read_u32(r, IFLA_NUM_RX_QUEUES, &u32_data) == 0);
 117
 118         assert_se(sd_netlink_message_read_ether_addr(r, IFLA_ADDRESS, &eth_data) == 0);
 119
 120         assert_se((m = sd_netlink_message_unref(m)) == NULL);
 121         assert_se((r = sd_netlink_message_unref(r)) == NULL);
 122 }
 123
 124
 125 static void test_address_get(sd_netlink *rtnl, int ifindex) {
 126         sd_netlink_message *m;
 127         sd_netlink_message *r;
 128         struct in_addr in_data;
 129         struct ifa_cacheinfo cache;
 130         const char *label;
 131
 132         assert_se(sd_rtnl_message_new_addr(rtnl, &m, RTM_GETADDR, ifindex, AF_INET) >= 0);
 133         assert_se(m);
 134
 135         assert_se(sd_netlink_call(rtnl, m, -1, &r) == 1);
 136
 137         assert_se(sd_netlink_message_read_in_addr(r, IFA_LOCAL, &in_data) == 0);
 138         assert_se(sd_netlink_message_read_in_addr(r, IFA_ADDRESS, &in_data) == 0);
 139         assert_se(sd_netlink_message_read_string(r, IFA_LABEL, &label) == 0);
 140         assert_se(sd_netlink_message_read_cache_info(r, IFA_CACHEINFO, &cache) == 0);
 141
 142         assert_se((m = sd_netlink_message_unref(m)) == NULL);
 143         assert_se((r = sd_netlink_message_unref(r)) == NULL);
 144
 145 }
 146
 147 static void test_route(void) {
 148         _cleanup_netlink_message_unref_ sd_netlink_message *req;
 149         struct in_addr addr, addr_data;
 150         uint32_t index = 2, u32_data;
 151         int r;
 152
 153         r = sd_rtnl_message_new_route(NULL, &req, RTM_NEWROUTE, AF_INET, RTPROT_STATIC);
 154         if (r < 0) {
 155                 log_error_errno(r, "Could not create RTM_NEWROUTE message: %m");
 156                 return;
 157         }
 158
 159         addr.s_addr = htonl(INADDR_LOOPBACK);
 160
 161         r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &addr);
 162         if (r < 0) {
 163                 log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
 164                 return;
 165         }
 166
 167         r = sd_netlink_message_append_u32(req, RTA_OIF, index);
 168         if (r < 0) {
 169                 log_error_errno(r, "Could not append RTA_OIF attribute: %m");
 170                 return;
 171         }
 172
 173         assert_se(sd_netlink_message_rewind(req) >= 0);
 174
 175         assert_se(sd_netlink_message_read_in_addr(req, RTA_GATEWAY, &addr_data) >= 0);
 176         assert_se(addr_data.s_addr == addr.s_addr);
 177
 178         assert_se(sd_netlink_message_read_u32(req, RTA_OIF, &u32_data) >= 0);
 179         assert_se(u32_data == index);
 180
 181         assert_se((req = sd_netlink_message_unref(req)) == NULL);
 182 }
 183
 184 static void test_multiple(void) {
 185         sd_netlink *rtnl1, *rtnl2;
 186
 187         assert_se(sd_netlink_open(&rtnl1) >= 0);
 188         assert_se(sd_netlink_open(&rtnl2) >= 0);
 189
 190         rtnl1 = sd_netlink_unref(rtnl1);
 191         rtnl2 = sd_netlink_unref(rtnl2);
 192 }
 193
 194 static int link_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
 195         char *ifname = userdata;
 196         const char *data;
 197
 198         assert_se(rtnl);
 199         assert_se(m);
 200
 201         log_info("got link info about %s", ifname);
 202         free(ifname);
 203
 204         assert_se(sd_netlink_message_read_string(m, IFLA_IFNAME, &data) >= 0);
 205         assert_se(streq(data, "lo"));
 206
 207         return 1;
 208 }
 209
 210 static void test_event_loop(int ifindex) {
 211         _cleanup_event_unref_ sd_event *event = NULL;
 212         _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
 213         _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
 214         char *ifname;
 215
 216         ifname = strdup("lo2");
 217         assert_se(ifname);
 218
 219         assert_se(sd_netlink_open(&rtnl) >= 0);
 220         assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
 221
 222         assert_se(sd_netlink_call_async(rtnl, m, &link_handler, ifname, 0, NULL) >= 0);
 223
 224         assert_se(sd_event_default(&event) >= 0);
 225
 226         assert_se(sd_netlink_attach_event(rtnl, event, 0) >= 0);
 227
 228         assert_se(sd_event_run(event, 0) >= 0);
 229
 230         assert_se(sd_netlink_detach_event(rtnl) >= 0);
 231
 232         assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
 233 }
 234
 235 static int pipe_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
 236         int *counter = userdata;
 237         int r;
 238
 239         (*counter) --;
 240
 241         r = sd_netlink_message_get_errno(m);
 242
 243         log_info_errno(r, "%d left in pipe. got reply: %m", *counter);
 244
 245         assert_se(r >= 0);
 246
 247         return 1;
 248 }
 249
 250 static void test_async(int ifindex) {
 251         _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
 252         _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL, *r = NULL;
 253         uint32_t serial;
 254         char *ifname;
 255
 256         ifname = strdup("lo");
 257         assert_se(ifname);
 258
 259         assert_se(sd_netlink_open(&rtnl) >= 0);
 260
 261         assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, ifindex) >= 0);
 262
 263         assert_se(sd_netlink_call_async(rtnl, m, &link_handler, ifname, 0, &serial) >= 0);
 264
 265         assert_se(sd_netlink_wait(rtnl, 0) >= 0);
 266         assert_se(sd_netlink_process(rtnl, &r) >= 0);
 267
 268         assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
 269 }
 270
 271 static void test_pipe(int ifindex) {
 272         _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
 273         _cleanup_netlink_message_unref_ sd_netlink_message *m1 = NULL, *m2 = NULL;
 274         int counter = 0;
 275
 276         assert_se(sd_netlink_open(&rtnl) >= 0);
 277
 278         assert_se(sd_rtnl_message_new_link(rtnl, &m1, RTM_GETLINK, ifindex) >= 0);
 279         assert_se(sd_rtnl_message_new_link(rtnl, &m2, RTM_GETLINK, ifindex) >= 0);
 280
 281         counter ++;
 282         assert_se(sd_netlink_call_async(rtnl, m1, &pipe_handler, &counter, 0, NULL) >= 0);
 283
 284         counter ++;
 285         assert_se(sd_netlink_call_async(rtnl, m2, &pipe_handler, &counter, 0, NULL) >= 0);
 286
 287         while (counter > 0) {
 288                 assert_se(sd_netlink_wait(rtnl, 0) >= 0);
 289                 assert_se(sd_netlink_process(rtnl, NULL) >= 0);
 290         }
 291
 292         assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
 293 }
 294
 295 static void test_container(void) {
 296         _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
 297         uint16_t u16_data;
 298         uint32_t u32_data;
 299         const char *string_data;
 300
 301         assert_se(sd_rtnl_message_new_link(NULL, &m, RTM_NEWLINK, 0) >= 0);
 302
 303         assert_se(sd_netlink_message_open_container(m, IFLA_LINKINFO) >= 0);
 304         assert_se(sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "vlan") >= 0);
 305         assert_se(sd_netlink_message_append_u16(m, IFLA_VLAN_ID, 100) >= 0);
 306         assert_se(sd_netlink_message_close_container(m) >= 0);
 307         assert_se(sd_netlink_message_append_string(m, IFLA_INFO_KIND, "vlan") >= 0);
 308         assert_se(sd_netlink_message_close_container(m) >= 0);
 309         assert_se(sd_netlink_message_close_container(m) == -EINVAL);
 310
 311         assert_se(sd_netlink_message_rewind(m) >= 0);
 312
 313         assert_se(sd_netlink_message_enter_container(m, IFLA_LINKINFO) >= 0);
 314         assert_se(sd_netlink_message_read_string(m, IFLA_INFO_KIND, &string_data) >= 0);
 315         assert_se(streq("vlan", string_data));
 316
 317         assert_se(sd_netlink_message_enter_container(m, IFLA_INFO_DATA) >= 0);
 318         assert_se(sd_netlink_message_read_u16(m, IFLA_VLAN_ID, &u16_data) >= 0);
 319         assert_se(sd_netlink_message_exit_container(m) >= 0);
 320
 321         assert_se(sd_netlink_message_read_string(m, IFLA_INFO_KIND, &string_data) >= 0);
 322         assert_se(streq("vlan", string_data));
 323         assert_se(sd_netlink_message_exit_container(m) >= 0);
 324
 325         assert_se(sd_netlink_message_read_u32(m, IFLA_LINKINFO, &u32_data) < 0);
 326
 327         assert_se(sd_netlink_message_exit_container(m) == -EINVAL);
 328 }
 329
 330 static void test_match(void) {
 331         _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
 332
 333         assert_se(sd_netlink_open(&rtnl) >= 0);
 334
 335         assert_se(sd_netlink_add_match(rtnl, RTM_NEWLINK, &link_handler, NULL) >= 0);
 336         assert_se(sd_netlink_add_match(rtnl, RTM_NEWLINK, &link_handler, NULL) >= 0);
 337
 338         assert_se(sd_netlink_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 1);
 339         assert_se(sd_netlink_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 1);
 340         assert_se(sd_netlink_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 0);
 341
 342         assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
 343 }
 344
 345 static void test_get_addresses(sd_netlink *rtnl) {
 346         _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL;
 347         sd_netlink_message *m;
 348
 349         assert_se(sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC) >= 0);
 350
 351         assert_se(sd_netlink_call(rtnl, req, 0, &reply) >= 0);
 352
 353         for (m = reply; m; m = sd_netlink_message_next(m)) {
 354                 uint16_t type;
 355                 unsigned char scope, flags;
 356                 int family, ifindex;
 357
 358                 assert_se(sd_netlink_message_get_type(m, &type) >= 0);
 359                 assert_se(type == RTM_NEWADDR);
 360
 361                 assert_se(sd_rtnl_message_addr_get_ifindex(m, &ifindex) >= 0);
 362                 assert_se(sd_rtnl_message_addr_get_family(m, &family) >= 0);
 363                 assert_se(sd_rtnl_message_addr_get_scope(m, &scope) >= 0);
 364                 assert_se(sd_rtnl_message_addr_get_flags(m, &flags) >= 0);
 365
 366                 assert_se(ifindex > 0);
 367                 assert_se(family == AF_INET || family == AF_INET6);
 368
 369                 log_info("got IPv%u address on ifindex %i", family == AF_INET ? 4: 6, ifindex);
 370         }
 371 }
 372
 373 static void test_message(void) {
 374         _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
 375
 376         assert_se(rtnl_message_new_synthetic_error(-ETIMEDOUT, 1, &m) >= 0);
 377         assert_se(sd_netlink_message_get_errno(m) == -ETIMEDOUT);
 378 }
 379
 380 int main(void) {
 381         sd_netlink *rtnl;
 382         sd_netlink_message *m;
 383         sd_netlink_message *r;
 384         const char *string_data;
 385         int if_loopback;
 386         uint16_t type;
 387
 388         test_message();
 389
 390         test_match();
 391
 392         test_multiple();
 393
 394         test_route();
 395
 396         test_container();
 397
 398         assert_se(sd_netlink_open(&rtnl) >= 0);
 399         assert_se(rtnl);
 400
 401         if_loopback = (int) if_nametoindex("lo");
 402         assert_se(if_loopback > 0);
 403
 404         test_async(if_loopback);
 405
 406         test_pipe(if_loopback);
 407
 408         test_event_loop(if_loopback);
 409
 410         test_link_configure(rtnl, if_loopback);
 411
 412         test_get_addresses(rtnl);
 413
 414         test_message_link_bridge(rtnl);
 415
 416         assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, if_loopback) >= 0);
 417         assert_se(m);
 418
 419         assert_se(sd_netlink_message_get_type(m, &type) >= 0);
 420         assert_se(type == RTM_GETLINK);
 421
 422         assert_se(sd_netlink_message_read_string(m, IFLA_IFNAME, &string_data) == -EPERM);
 423
 424         assert_se(sd_netlink_call(rtnl, m, 0, &r) == 1);
 425         assert_se(sd_netlink_message_get_type(r, &type) >= 0);
 426         assert_se(type == RTM_NEWLINK);
 427
 428         assert_se((r = sd_netlink_message_unref(r)) == NULL);
 429
 430         assert_se(sd_netlink_call(rtnl, m, -1, &r) == -EPERM);
 431         assert_se((m = sd_netlink_message_unref(m)) == NULL);
 432         assert_se((r = sd_netlink_message_unref(r)) == NULL);
 433
 434         test_link_get(rtnl, if_loopback);
 435         test_address_get(rtnl, if_loopback);
 436
 437         assert_se((m = sd_netlink_message_unref(m)) == NULL);
 438         assert_se((r = sd_netlink_message_unref(r)) == NULL);
 439         assert_se((rtnl = sd_netlink_unref(rtnl)) == NULL);
 440
 441         return EXIT_SUCCESS;
 442 }