tools/hv/hv_kvp_daemon.c

   1 /*
   2  * An implementation of key value pair (KVP) functionality for Linux.
   3  *
   4  *
   5  * Copyright (C) 2010, Novell, Inc.
   6  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <sys/poll.h>
  28 #include <sys/utsname.h>
  29 #include <linux/types.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <string.h>
  34 #include <ctype.h>
  35 #include <errno.h>
  36 #include <arpa/inet.h>
  37 #include <linux/connector.h>
  38 #include <linux/hyperv.h>
  39 #include <linux/netlink.h>
  40 #include <ifaddrs.h>
  41 #include <netdb.h>
  42 #include <syslog.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45 #include <dirent.h>
  46 #include <net/if.h>
  47
  48 /*
  49  * KVP protocol: The user mode component first registers with the
  50  * the kernel component. Subsequently, the kernel component requests, data
  51  * for the specified keys. In response to this message the user mode component
  52  * fills in the value corresponding to the specified key. We overload the
  53  * sequence field in the cn_msg header to define our KVP message types.
  54  *
  55  * We use this infrastructure for also supporting queries from user mode
  56  * application for state that may be maintained in the KVP kernel component.
  57  *
  58  */
  59
  60
  61 enum key_index {
  62         FullyQualifiedDomainName = 0,
  63         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  64         NetworkAddressIPv4,
  65         NetworkAddressIPv6,
  66         OSBuildNumber,
  67         OSName,
  68         OSMajorVersion,
  69         OSMinorVersion,
  70         OSVersion,
  71         ProcessorArchitecture
  72 };
  73
  74
  75 enum {
  76         IPADDR = 0,
  77         NETMASK,
  78         GATEWAY,
  79         DNS
  80 };
  81
  82 static char kvp_send_buffer[4096];
  83 static char kvp_recv_buffer[4096 * 2];
  84 static struct sockaddr_nl addr;
  85 static int in_hand_shake = 1;
  86
  87 static char *os_name = "";
  88 static char *os_major = "";
  89 static char *os_minor = "";
  90 static char *processor_arch;
  91 static char *os_build;
  92 static char *os_version;
  93 static char *lic_version = "Unknown version";
  94 static struct utsname uts_buf;
  95
  96 /*
  97  * The location of the interface configuration file.
  98  */
  99
 100 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 101
 102 #define MAX_FILE_NAME 100
 103 #define ENTRIES_PER_BLOCK 50
 104
 105 #ifndef SOL_NETLINK
 106 #define SOL_NETLINK 270
 107 #endif
 108
 109 struct kvp_record {
 110         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 111         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 112 };
 113
 114 struct kvp_file_state {
 115         int fd;
 116         int num_blocks;
 117         struct kvp_record *records;
 118         int num_records;
 119         char fname[MAX_FILE_NAME];
 120 };
 121
 122 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 123
 124 static void kvp_acquire_lock(int pool)
 125 {
 126         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 127         fl.l_pid = getpid();
 128
 129         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 130                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 131                                 errno, strerror(errno));
 132                 exit(EXIT_FAILURE);
 133         }
 134 }
 135
 136 static void kvp_release_lock(int pool)
 137 {
 138         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 139         fl.l_pid = getpid();
 140
 141         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 142                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 143                                 errno, strerror(errno));
 144                 exit(EXIT_FAILURE);
 145         }
 146 }
 147
 148 static void kvp_update_file(int pool)
 149 {
 150         FILE *filep;
 151         size_t bytes_written;
 152
 153         /*
 154          * We are going to write our in-memory registry out to
 155          * disk; acquire the lock first.
 156          */
 157         kvp_acquire_lock(pool);
 158
 159         filep = fopen(kvp_file_info[pool].fname, "we");
 160         if (!filep) {
 161                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 162                                 errno, strerror(errno));
 163                 kvp_release_lock(pool);
 164                 exit(EXIT_FAILURE);
 165         }
 166
 167         bytes_written = fwrite(kvp_file_info[pool].records,
 168                                 sizeof(struct kvp_record),
 169                                 kvp_file_info[pool].num_records, filep);
 170
 171         if (ferror(filep) || fclose(filep)) {
 172                 kvp_release_lock(pool);
 173                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 174                 exit(EXIT_FAILURE);
 175         }
 176
 177         kvp_release_lock(pool);
 178 }
 179
 180 static void kvp_update_mem_state(int pool)
 181 {
 182         FILE *filep;
 183         size_t records_read = 0;
 184         struct kvp_record *record = kvp_file_info[pool].records;
 185         struct kvp_record *readp;
 186         int num_blocks = kvp_file_info[pool].num_blocks;
 187         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 188
 189         kvp_acquire_lock(pool);
 190
 191         filep = fopen(kvp_file_info[pool].fname, "re");
 192         if (!filep) {
 193                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 194                                 errno, strerror(errno));
 195                 kvp_release_lock(pool);
 196                 exit(EXIT_FAILURE);
 197         }
 198         for (;;) {
 199                 readp = &record[records_read];
 200                 records_read += fread(readp, sizeof(struct kvp_record),
 201                                         ENTRIES_PER_BLOCK * num_blocks,
 202                                         filep);
 203
 204                 if (ferror(filep)) {
 205                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
 206                         exit(EXIT_FAILURE);
 207                 }
 208
 209                 if (!feof(filep)) {
 210                         /*
 211                          * We have more data to read.
 212                          */
 213                         num_blocks++;
 214                         record = realloc(record, alloc_unit * num_blocks);
 215
 216                         if (record == NULL) {
 217                                 syslog(LOG_ERR, "malloc failed");
 218                                 exit(EXIT_FAILURE);
 219                         }
 220                         continue;
 221                 }
 222                 break;
 223         }
 224
 225         kvp_file_info[pool].num_blocks = num_blocks;
 226         kvp_file_info[pool].records = record;
 227         kvp_file_info[pool].num_records = records_read;
 228
 229         fclose(filep);
 230         kvp_release_lock(pool);
 231 }
 232 static int kvp_file_init(void)
 233 {
 234         int  fd;
 235         FILE *filep;
 236         size_t records_read;
 237         char *fname;
 238         struct kvp_record *record;
 239         struct kvp_record *readp;
 240         int num_blocks;
 241         int i;
 242         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 243
 244         if (access(KVP_CONFIG_LOC, F_OK)) {
 245                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 246                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
 247                                         errno, strerror(errno));
 248                         exit(EXIT_FAILURE);
 249                 }
 250         }
 251
 252         for (i = 0; i < KVP_POOL_COUNT; i++) {
 253                 fname = kvp_file_info[i].fname;
 254                 records_read = 0;
 255                 num_blocks = 1;
 256                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 257                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 258
 259                 if (fd == -1)
 260                         return 1;
 261
 262
 263                 filep = fopen(fname, "re");
 264                 if (!filep) {
 265                         close(fd);
 266                         return 1;
 267                 }
 268
 269                 record = malloc(alloc_unit * num_blocks);
 270                 if (record == NULL) {
 271                         fclose(filep);
 272                         close(fd);
 273                         return 1;
 274                 }
 275                 for (;;) {
 276                         readp = &record[records_read];
 277                         records_read += fread(readp, sizeof(struct kvp_record),
 278                                         ENTRIES_PER_BLOCK,
 279                                         filep);
 280
 281                         if (ferror(filep)) {
 282                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 283                                        i);
 284                                 exit(EXIT_FAILURE);
 285                         }
 286
 287                         if (!feof(filep)) {
 288                                 /*
 289                                  * We have more data to read.
 290                                  */
 291                                 num_blocks++;
 292                                 record = realloc(record, alloc_unit *
 293                                                 num_blocks);
 294                                 if (record == NULL) {
 295                                         fclose(filep);
 296                                         close(fd);
 297                                         return 1;
 298                                 }
 299                                 continue;
 300                         }
 301                         break;
 302                 }
 303                 kvp_file_info[i].fd = fd;
 304                 kvp_file_info[i].num_blocks = num_blocks;
 305                 kvp_file_info[i].records = record;
 306                 kvp_file_info[i].num_records = records_read;
 307                 fclose(filep);
 308
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int kvp_key_delete(int pool, const char *key, int key_size)
 315 {
 316         int i;
 317         int j, k;
 318         int num_records;
 319         struct kvp_record *record;
 320
 321         /*
 322          * First update the in-memory state.
 323          */
 324         kvp_update_mem_state(pool);
 325
 326         num_records = kvp_file_info[pool].num_records;
 327         record = kvp_file_info[pool].records;
 328
 329         for (i = 0; i < num_records; i++) {
 330                 if (memcmp(key, record[i].key, key_size))
 331                         continue;
 332                 /*
 333                  * Found a match; just move the remaining
 334                  * entries up.
 335                  */
 336                 if (i == num_records) {
 337                         kvp_file_info[pool].num_records--;
 338                         kvp_update_file(pool);
 339                         return 0;
 340                 }
 341
 342                 j = i;
 343                 k = j + 1;
 344                 for (; k < num_records; k++) {
 345                         strcpy(record[j].key, record[k].key);
 346                         strcpy(record[j].value, record[k].value);
 347                         j++;
 348                 }
 349
 350                 kvp_file_info[pool].num_records--;
 351                 kvp_update_file(pool);
 352                 return 0;
 353         }
 354         return 1;
 355 }
 356
 357 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
 358                         int value_size)
 359 {
 360         int i;
 361         int num_records;
 362         struct kvp_record *record;
 363         int num_blocks;
 364
 365         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 366                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 367                 return 1;
 368
 369         /*
 370          * First update the in-memory state.
 371          */
 372         kvp_update_mem_state(pool);
 373
 374         num_records = kvp_file_info[pool].num_records;
 375         record = kvp_file_info[pool].records;
 376         num_blocks = kvp_file_info[pool].num_blocks;
 377
 378         for (i = 0; i < num_records; i++) {
 379                 if (memcmp(key, record[i].key, key_size))
 380                         continue;
 381                 /*
 382                  * Found a match; just update the value -
 383                  * this is the modify case.
 384                  */
 385                 memcpy(record[i].value, value, value_size);
 386                 kvp_update_file(pool);
 387                 return 0;
 388         }
 389
 390         /*
 391          * Need to add a new entry;
 392          */
 393         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 394                 /* Need to allocate a larger array for reg entries. */
 395                 record = realloc(record, sizeof(struct kvp_record) *
 396                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 397
 398                 if (record == NULL)
 399                         return 1;
 400                 kvp_file_info[pool].num_blocks++;
 401
 402         }
 403         memcpy(record[i].value, value, value_size);
 404         memcpy(record[i].key, key, key_size);
 405         kvp_file_info[pool].records = record;
 406         kvp_file_info[pool].num_records++;
 407         kvp_update_file(pool);
 408         return 0;
 409 }
 410
 411 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
 412                         int value_size)
 413 {
 414         int i;
 415         int num_records;
 416         struct kvp_record *record;
 417
 418         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 419                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 420                 return 1;
 421
 422         /*
 423          * First update the in-memory state.
 424          */
 425         kvp_update_mem_state(pool);
 426
 427         num_records = kvp_file_info[pool].num_records;
 428         record = kvp_file_info[pool].records;
 429
 430         for (i = 0; i < num_records; i++) {
 431                 if (memcmp(key, record[i].key, key_size))
 432                         continue;
 433                 /*
 434                  * Found a match; just copy the value out.
 435                  */
 436                 memcpy(value, record[i].value, value_size);
 437                 return 0;
 438         }
 439
 440         return 1;
 441 }
 442
 443 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
 444                                 char *value, int value_size)
 445 {
 446         struct kvp_record *record;
 447
 448         /*
 449          * First update our in-memory database.
 450          */
 451         kvp_update_mem_state(pool);
 452         record = kvp_file_info[pool].records;
 453
 454         if (index >= kvp_file_info[pool].num_records) {
 455                 return 1;
 456         }
 457
 458         memcpy(key, record[index].key, key_size);
 459         memcpy(value, record[index].value, value_size);
 460         return 0;
 461 }
 462
 463
 464 void kvp_get_os_info(void)
 465 {
 466         FILE    *file;
 467         char    *p, buf[512];
 468
 469         uname(&uts_buf);
 470         os_version = uts_buf.release;
 471         os_build = strdup(uts_buf.release);
 472
 473         os_name = uts_buf.sysname;
 474         processor_arch = uts_buf.machine;
 475
 476         /*
 477          * The current windows host (win7) expects the build
 478          * string to be of the form: x.y.z
 479          * Strip additional information we may have.
 480          */
 481         p = strchr(os_version, '-');
 482         if (p)
 483                 *p = '\0';
 484
 485         /*
 486          * Parse the /etc/os-release file if present:
 487          * http://www.freedesktop.org/software/systemd/man/os-release.html
 488          */
 489         file = fopen("/etc/os-release", "r");
 490         if (file != NULL) {
 491                 while (fgets(buf, sizeof(buf), file)) {
 492                         char *value, *q;
 493
 494                         /* Ignore comments */
 495                         if (buf[0] == '#')
 496                                 continue;
 497
 498                         /* Split into name=value */
 499                         p = strchr(buf, '=');
 500                         if (!p)
 501                                 continue;
 502                         *p++ = 0;
 503
 504                         /* Remove quotes and newline; un-escape */
 505                         value = p;
 506                         q = p;
 507                         while (*p) {
 508                                 if (*p == '\\') {
 509                                         ++p;
 510                                         if (!*p)
 511                                                 break;
 512                                         *q++ = *p++;
 513                                 } else if (*p == '\'' || *p == '"' ||
 514                                            *p == '\n') {
 515                                         ++p;
 516                                 } else {
 517                                         *q++ = *p++;
 518                                 }
 519                         }
 520                         *q = 0;
 521
 522                         if (!strcmp(buf, "NAME")) {
 523                                 p = strdup(value);
 524                                 if (!p)
 525                                         break;
 526                                 os_name = p;
 527                         } else if (!strcmp(buf, "VERSION_ID")) {
 528                                 p = strdup(value);
 529                                 if (!p)
 530                                         break;
 531                                 os_major = p;
 532                         }
 533                 }
 534                 fclose(file);
 535                 return;
 536         }
 537
 538         /* Fallback for older RH/SUSE releases */
 539         file = fopen("/etc/SuSE-release", "r");
 540         if (file != NULL)
 541                 goto kvp_osinfo_found;
 542         file  = fopen("/etc/redhat-release", "r");
 543         if (file != NULL)
 544                 goto kvp_osinfo_found;
 545
 546         /*
 547          * We don't have information about the os.
 548          */
 549         return;
 550
 551 kvp_osinfo_found:
 552         /* up to three lines */
 553         p = fgets(buf, sizeof(buf), file);
 554         if (p) {
 555                 p = strchr(buf, '\n');
 556                 if (p)
 557                         *p = '\0';
 558                 p = strdup(buf);
 559                 if (!p)
 560                         goto done;
 561                 os_name = p;
 562
 563                 /* second line */
 564                 p = fgets(buf, sizeof(buf), file);
 565                 if (p) {
 566                         p = strchr(buf, '\n');
 567                         if (p)
 568                                 *p = '\0';
 569                         p = strdup(buf);
 570                         if (!p)
 571                                 goto done;
 572                         os_major = p;
 573
 574                         /* third line */
 575                         p = fgets(buf, sizeof(buf), file);
 576                         if (p)  {
 577                                 p = strchr(buf, '\n');
 578                                 if (p)
 579                                         *p = '\0';
 580                                 p = strdup(buf);
 581                                 if (p)
 582                                         os_minor = p;
 583                         }
 584                 }
 585         }
 586
 587 done:
 588         fclose(file);
 589         return;
 590 }
 591
 592
 593
 594 /*
 595  * Retrieve an interface name corresponding to the specified guid.
 596  * If there is a match, the function returns a pointer
 597  * to the interface name and if not, a NULL is returned.
 598  * If a match is found, the caller is responsible for
 599  * freeing the memory.
 600  */
 601
 602 static char *kvp_get_if_name(char *guid)
 603 {
 604         DIR *dir;
 605         struct dirent *entry;
 606         FILE    *file;
 607         char    *p, *q, *x;
 608         char    *if_name = NULL;
 609         char    buf[256];
 610         char *kvp_net_dir = "/sys/class/net/";
 611         char dev_id[256];
 612
 613         dir = opendir(kvp_net_dir);
 614         if (dir == NULL)
 615                 return NULL;
 616
 617         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 618         q = dev_id + strlen(kvp_net_dir);
 619
 620         while ((entry = readdir(dir)) != NULL) {
 621                 /*
 622                  * Set the state for the next pass.
 623                  */
 624                 *q = '\0';
 625                 strcat(dev_id, entry->d_name);
 626                 strcat(dev_id, "/device/device_id");
 627
 628                 file = fopen(dev_id, "r");
 629                 if (file == NULL)
 630                         continue;
 631
 632                 p = fgets(buf, sizeof(buf), file);
 633                 if (p) {
 634                         x = strchr(p, '\n');
 635                         if (x)
 636                                 *x = '\0';
 637
 638                         if (!strcmp(p, guid)) {
 639                                 /*
 640                                  * Found the guid match; return the interface
 641                                  * name. The caller will free the memory.
 642                                  */
 643                                 if_name = strdup(entry->d_name);
 644                                 fclose(file);
 645                                 break;
 646                         }
 647                 }
 648                 fclose(file);
 649         }
 650
 651         closedir(dir);
 652         return if_name;
 653 }
 654
 655 /*
 656  * Retrieve the MAC address given the interface name.
 657  */
 658
 659 static char *kvp_if_name_to_mac(char *if_name)
 660 {
 661         FILE    *file;
 662         char    *p, *x;
 663         char    buf[256];
 664         char addr_file[256];
 665         int i;
 666         char *mac_addr = NULL;
 667
 668         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 669                 if_name, "/address");
 670
 671         file = fopen(addr_file, "r");
 672         if (file == NULL)
 673                 return NULL;
 674
 675         p = fgets(buf, sizeof(buf), file);
 676         if (p) {
 677                 x = strchr(p, '\n');
 678                 if (x)
 679                         *x = '\0';
 680                 for (i = 0; i < strlen(p); i++)
 681                         p[i] = toupper(p[i]);
 682                 mac_addr = strdup(p);
 683         }
 684
 685         fclose(file);
 686         return mac_addr;
 687 }
 688
 689
 690 /*
 691  * Retrieve the interface name given tha MAC address.
 692  */
 693
 694 static char *kvp_mac_to_if_name(char *mac)
 695 {
 696         DIR *dir;
 697         struct dirent *entry;
 698         FILE    *file;
 699         char    *p, *q, *x;
 700         char    *if_name = NULL;
 701         char    buf[256];
 702         char *kvp_net_dir = "/sys/class/net/";
 703         char dev_id[256];
 704         int i;
 705
 706         dir = opendir(kvp_net_dir);
 707         if (dir == NULL)
 708                 return NULL;
 709
 710         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 711         q = dev_id + strlen(kvp_net_dir);
 712
 713         while ((entry = readdir(dir)) != NULL) {
 714                 /*
 715                  * Set the state for the next pass.
 716                  */
 717                 *q = '\0';
 718
 719                 strcat(dev_id, entry->d_name);
 720                 strcat(dev_id, "/address");
 721
 722                 file = fopen(dev_id, "r");
 723                 if (file == NULL)
 724                         continue;
 725
 726                 p = fgets(buf, sizeof(buf), file);
 727                 if (p) {
 728                         x = strchr(p, '\n');
 729                         if (x)
 730                                 *x = '\0';
 731
 732                         for (i = 0; i < strlen(p); i++)
 733                                 p[i] = toupper(p[i]);
 734
 735                         if (!strcmp(p, mac)) {
 736                                 /*
 737                                  * Found the MAC match; return the interface
 738                                  * name. The caller will free the memory.
 739                                  */
 740                                 if_name = strdup(entry->d_name);
 741                                 fclose(file);
 742                                 break;
 743                         }
 744                 }
 745                 fclose(file);
 746         }
 747
 748         closedir(dir);
 749         return if_name;
 750 }
 751
 752
 753 static void kvp_process_ipconfig_file(char *cmd,
 754                                         char *config_buf, int len,
 755                                         int element_size, int offset)
 756 {
 757         char buf[256];
 758         char *p;
 759         char *x;
 760         FILE *file;
 761
 762         /*
 763          * First execute the command.
 764          */
 765         file = popen(cmd, "r");
 766         if (file == NULL)
 767                 return;
 768
 769         if (offset == 0)
 770                 memset(config_buf, 0, len);
 771         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 772                 if ((len - strlen(config_buf)) < (element_size + 1))
 773                         break;
 774
 775                 x = strchr(p, '\n');
 776                 if (x)
 777                         *x = '\0';
 778
 779                 strcat(config_buf, p);
 780                 strcat(config_buf, ";");
 781         }
 782         pclose(file);
 783 }
 784
 785 static void kvp_get_ipconfig_info(char *if_name,
 786                                  struct hv_kvp_ipaddr_value *buffer)
 787 {
 788         char cmd[512];
 789         char dhcp_info[128];
 790         char *p;
 791         FILE *file;
 792
 793         /*
 794          * Get the address of default gateway (ipv4).
 795          */
 796         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 797         strcat(cmd, " | awk '/default/ {print $3 }'");
 798
 799         /*
 800          * Execute the command to gather gateway info.
 801          */
 802         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 803                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 804
 805         /*
 806          * Get the address of default gateway (ipv6).
 807          */
 808         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 809         strcat(cmd, " | awk '/default/ {print $3 }'");
 810
 811         /*
 812          * Execute the command to gather gateway info (ipv6).
 813          */
 814         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 815                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 816
 817
 818         /*
 819          * Gather the DNS  state.
 820          * Since there is no standard way to get this information
 821          * across various distributions of interest; we just invoke
 822          * an external script that needs to be ported across distros
 823          * of interest.
 824          *
 825          * Following is the expected format of the information from the script:
 826          *
 827          * ipaddr1 (nameserver1)
 828          * ipaddr2 (nameserver2)
 829          * .
 830          * .
 831          */
 832
 833         sprintf(cmd, "%s",  "hv_get_dns_info");
 834
 835         /*
 836          * Execute the command to gather DNS info.
 837          */
 838         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 839                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 840
 841         /*
 842          * Gather the DHCP state.
 843          * We will gather this state by invoking an external script.
 844          * The parameter to the script is the interface name.
 845          * Here is the expected output:
 846          *
 847          * Enabled: DHCP enabled.
 848          */
 849
 850         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 851
 852         file = popen(cmd, "r");
 853         if (file == NULL)
 854                 return;
 855
 856         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 857         if (p == NULL) {
 858                 pclose(file);
 859                 return;
 860         }
 861
 862         if (!strncmp(p, "Enabled", 7))
 863                 buffer->dhcp_enabled = 1;
 864         else
 865                 buffer->dhcp_enabled = 0;
 866
 867         pclose(file);
 868 }
 869
 870
 871 static unsigned int hweight32(unsigned int *w)
 872 {
 873         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 874         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 875         res = (res + (res >> 4)) & 0x0F0F0F0F;
 876         res = res + (res >> 8);
 877         return (res + (res >> 16)) & 0x000000FF;
 878 }
 879
 880 static int kvp_process_ip_address(void *addrp,
 881                                 int family, char *buffer,
 882                                 int length,  int *offset)
 883 {
 884         struct sockaddr_in *addr;
 885         struct sockaddr_in6 *addr6;
 886         int addr_length;
 887         char tmp[50];
 888         const char *str;
 889
 890         if (family == AF_INET) {
 891                 addr = (struct sockaddr_in *)addrp;
 892                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 893                 addr_length = INET_ADDRSTRLEN;
 894         } else {
 895                 addr6 = (struct sockaddr_in6 *)addrp;
 896                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 897                 addr_length = INET6_ADDRSTRLEN;
 898         }
 899
 900         if ((length - *offset) < addr_length + 2)
 901                 return HV_E_FAIL;
 902         if (str == NULL) {
 903                 strcpy(buffer, "inet_ntop failed\n");
 904                 return HV_E_FAIL;
 905         }
 906         if (*offset == 0)
 907                 strcpy(buffer, tmp);
 908         else {
 909                 strcat(buffer, ";");
 910                 strcat(buffer, tmp);
 911         }
 912
 913         *offset += strlen(str) + 1;
 914
 915         return 0;
 916 }
 917
 918 static int
 919 kvp_get_ip_info(int family, char *if_name, int op,
 920                  void  *out_buffer, int length)
 921 {
 922         struct ifaddrs *ifap;
 923         struct ifaddrs *curp;
 924         int offset = 0;
 925         int sn_offset = 0;
 926         int error = 0;
 927         char *buffer;
 928         struct hv_kvp_ipaddr_value *ip_buffer;
 929         char cidr_mask[5]; /* /xyz */
 930         int weight;
 931         int i;
 932         unsigned int *w;
 933         char *sn_str;
 934         struct sockaddr_in6 *addr6;
 935
 936         if (op == KVP_OP_ENUMERATE) {
 937                 buffer = out_buffer;
 938         } else {
 939                 ip_buffer = out_buffer;
 940                 buffer = (char *)ip_buffer->ip_addr;
 941                 ip_buffer->addr_family = 0;
 942         }
 943         /*
 944          * On entry into this function, the buffer is capable of holding the
 945          * maximum key value.
 946          */
 947
 948         if (getifaddrs(&ifap)) {
 949                 strcpy(buffer, "getifaddrs failed\n");
 950                 return HV_E_FAIL;
 951         }
 952
 953         curp = ifap;
 954         while (curp != NULL) {
 955                 if (curp->ifa_addr == NULL) {
 956                         curp = curp->ifa_next;
 957                         continue;
 958                 }
 959
 960                 if ((if_name != NULL) &&
 961                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 962                         /*
 963                          * We want info about a specific interface;
 964                          * just continue.
 965                          */
 966                         curp = curp->ifa_next;
 967                         continue;
 968                 }
 969
 970                 /*
 971                  * We only support two address families: AF_INET and AF_INET6.
 972                  * If a family value of 0 is specified, we collect both
 973                  * supported address families; if not we gather info on
 974                  * the specified address family.
 975                  */
 976                 if ((((family != 0) &&
 977                          (curp->ifa_addr->sa_family != family))) ||
 978                          (curp->ifa_flags & IFF_LOOPBACK)) {
 979                         curp = curp->ifa_next;
 980                         continue;
 981                 }
 982                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 983                         (curp->ifa_addr->sa_family != AF_INET6)) {
 984                         curp = curp->ifa_next;
 985                         continue;
 986                 }
 987
 988                 if (op == KVP_OP_GET_IP_INFO) {
 989                         /*
 990                          * Gather info other than the IP address.
 991                          * IP address info will be gathered later.
 992                          */
 993                         if (curp->ifa_addr->sa_family == AF_INET) {
 994                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 995                                 /*
 996                                  * Get subnet info.
 997                                  */
 998                                 error = kvp_process_ip_address(
 999                                                              curp->ifa_netmask,
1000                                                              AF_INET,
1001                                                              (char *)
1002                                                              ip_buffer->sub_net,
1003                                                              length,
1004                                                              &sn_offset);
1005                                 if (error)
1006                                         goto gather_ipaddr;
1007                         } else {
1008                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1009
1010                                 /*
1011                                  * Get subnet info in CIDR format.
1012                                  */
1013                                 weight = 0;
1014                                 sn_str = (char *)ip_buffer->sub_net;
1015                                 addr6 = (struct sockaddr_in6 *)
1016                                         curp->ifa_netmask;
1017                                 w = addr6->sin6_addr.s6_addr32;
1018
1019                                 for (i = 0; i < 4; i++)
1020                                         weight += hweight32(&w[i]);
1021
1022                                 sprintf(cidr_mask, "/%d", weight);
1023                                 if ((length - sn_offset) <
1024                                         (strlen(cidr_mask) + 1))
1025                                         goto gather_ipaddr;
1026
1027                                 if (sn_offset == 0)
1028                                         strcpy(sn_str, cidr_mask);
1029                                 else
1030                                         strcat(sn_str, cidr_mask);
1031                                 strcat((char *)ip_buffer->sub_net, ";");
1032                                 sn_offset += strlen(sn_str) + 1;
1033                         }
1034
1035                         /*
1036                          * Collect other ip related configuration info.
1037                          */
1038
1039                         kvp_get_ipconfig_info(if_name, ip_buffer);
1040                 }
1041
1042 gather_ipaddr:
1043                 error = kvp_process_ip_address(curp->ifa_addr,
1044                                                 curp->ifa_addr->sa_family,
1045                                                 buffer,
1046                                                 length, &offset);
1047                 if (error)
1048                         goto getaddr_done;
1049
1050                 curp = curp->ifa_next;
1051         }
1052
1053 getaddr_done:
1054         freeifaddrs(ifap);
1055         return error;
1056 }
1057
1058
1059 static int expand_ipv6(char *addr, int type)
1060 {
1061         int ret;
1062         struct in6_addr v6_addr;
1063
1064         ret = inet_pton(AF_INET6, addr, &v6_addr);
1065
1066         if (ret != 1) {
1067                 if (type == NETMASK)
1068                         return 1;
1069                 return 0;
1070         }
1071
1072         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1073                 "%02x%02x:%02x%02x:%02x%02x",
1074                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1075                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1076                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1077                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1078                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1079                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1080                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1081                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1082
1083         return 1;
1084
1085 }
1086
1087 static int is_ipv4(char *addr)
1088 {
1089         int ret;
1090         struct in_addr ipv4_addr;
1091
1092         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1093
1094         if (ret == 1)
1095                 return 1;
1096         return 0;
1097 }
1098
1099 static int parse_ip_val_buffer(char *in_buf, int *offset,
1100                                 char *out_buf, int out_len)
1101 {
1102         char *x;
1103         char *start;
1104
1105         /*
1106          * in_buf has sequence of characters that are seperated by
1107          * the character ';'. The last sequence does not have the
1108          * terminating ";" character.
1109          */
1110         start = in_buf + *offset;
1111
1112         x = strchr(start, ';');
1113         if (x)
1114                 *x = 0;
1115         else
1116                 x = start + strlen(start);
1117
1118         if (strlen(start) != 0) {
1119                 int i = 0;
1120                 /*
1121                  * Get rid of leading spaces.
1122                  */
1123                 while (start[i] == ' ')
1124                         i++;
1125
1126                 if ((x - start) <= out_len) {
1127                         strcpy(out_buf, (start + i));
1128                         *offset += (x - start) + 1;
1129                         return 1;
1130                 }
1131         }
1132         return 0;
1133 }
1134
1135 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1136 {
1137         int ret;
1138
1139         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1140
1141         if (ret < 0)
1142                 return HV_E_FAIL;
1143
1144         return 0;
1145 }
1146
1147
1148 static int process_ip_string(FILE *f, char *ip_string, int type)
1149 {
1150         int error = 0;
1151         char addr[INET6_ADDRSTRLEN];
1152         int i = 0;
1153         int j = 0;
1154         char str[256];
1155         char sub_str[10];
1156         int offset = 0;
1157
1158         memset(addr, 0, sizeof(addr));
1159
1160         while (parse_ip_val_buffer(ip_string, &offset, addr,
1161                                         (MAX_IP_ADDR_SIZE * 2))) {
1162
1163                 sub_str[0] = 0;
1164                 if (is_ipv4(addr)) {
1165                         switch (type) {
1166                         case IPADDR:
1167                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1168                                 break;
1169                         case NETMASK:
1170                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1171                                 break;
1172                         case GATEWAY:
1173                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1174                                 break;
1175                         case DNS:
1176                                 snprintf(str, sizeof(str), "%s", "DNS");
1177                                 break;
1178                         }
1179
1180                         if (type == DNS) {
1181                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1182                         } else if (type == GATEWAY && i == 0) {
1183                                 ++i;
1184                         } else {
1185                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1186                         }
1187
1188
1189                 } else if (expand_ipv6(addr, type)) {
1190                         switch (type) {
1191                         case IPADDR:
1192                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1193                                 break;
1194                         case NETMASK:
1195                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1196                                 break;
1197                         case GATEWAY:
1198                                 snprintf(str, sizeof(str), "%s",
1199                                         "IPV6_DEFAULTGW");
1200                                 break;
1201                         case DNS:
1202                                 snprintf(str, sizeof(str), "%s",  "DNS");
1203                                 break;
1204                         }
1205
1206                         if (type == DNS) {
1207                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1208                         } else if (j == 0) {
1209                                 ++j;
1210                         } else {
1211                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1212                         }
1213                 } else {
1214                         return  HV_INVALIDARG;
1215                 }
1216
1217                 error = kvp_write_file(f, str, sub_str, addr);
1218                 if (error)
1219                         return error;
1220                 memset(addr, 0, sizeof(addr));
1221         }
1222
1223         return 0;
1224 }
1225
1226 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1227 {
1228         int error = 0;
1229         char if_file[128];
1230         FILE *file;
1231         char cmd[512];
1232         char *mac_addr;
1233
1234         /*
1235          * Set the configuration for the specified interface with
1236          * the information provided. Since there is no standard
1237          * way to configure an interface, we will have an external
1238          * script that does the job of configuring the interface and
1239          * flushing the configuration.
1240          *
1241          * The parameters passed to this external script are:
1242          * 1. A configuration file that has the specified configuration.
1243          *
1244          * We will embed the name of the interface in the configuration
1245          * file: ifcfg-ethx (where ethx is the interface name).
1246          *
1247          * The information provided here may be more than what is needed
1248          * in a given distro to configure the interface and so are free
1249          * ignore information that may not be relevant.
1250          *
1251          * Here is the format of the ip configuration file:
1252          *
1253          * HWADDR=macaddr
1254          * DEVICE=interface name
1255          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1256          *                       or "none" if no boot-time protocol should be used)
1257          *
1258          * IPADDR0=ipaddr1
1259          * IPADDR1=ipaddr2
1260          * IPADDRx=ipaddry (where y = x + 1)
1261          *
1262          * NETMASK0=netmask1
1263          * NETMASKx=netmasky (where y = x + 1)
1264          *
1265          * GATEWAY=ipaddr1
1266          * GATEWAYx=ipaddry (where y = x + 1)
1267          *
1268          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1269          *
1270          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1271          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1272          * IPV6NETMASK.
1273          *
1274          * The host can specify multiple ipv4 and ipv6 addresses to be
1275          * configured for the interface. Furthermore, the configuration
1276          * needs to be persistent. A subsequent GET call on the interface
1277          * is expected to return the configuration that is set via the SET
1278          * call.
1279          */
1280
1281         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1282                 "/ifcfg-", if_name);
1283
1284         file = fopen(if_file, "w");
1285
1286         if (file == NULL) {
1287                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1288                                 errno, strerror(errno));
1289                 return HV_E_FAIL;
1290         }
1291
1292         /*
1293          * First write out the MAC address.
1294          */
1295
1296         mac_addr = kvp_if_name_to_mac(if_name);
1297         if (mac_addr == NULL) {
1298                 error = HV_E_FAIL;
1299                 goto setval_error;
1300         }
1301
1302         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1303         if (error)
1304                 goto setval_error;
1305
1306         error = kvp_write_file(file, "DEVICE", "", if_name);
1307         if (error)
1308                 goto setval_error;
1309
1310         if (new_val->dhcp_enabled) {
1311                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1312                 if (error)
1313                         goto setval_error;
1314
1315                 /*
1316                  * We are done!.
1317                  */
1318                 goto setval_done;
1319
1320         } else {
1321                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1322                 if (error)
1323                         goto setval_error;
1324         }
1325
1326         /*
1327          * Write the configuration for ipaddress, netmask, gateway and
1328          * name servers.
1329          */
1330
1331         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1332         if (error)
1333                 goto setval_error;
1334
1335         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1336         if (error)
1337                 goto setval_error;
1338
1339         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1340         if (error)
1341                 goto setval_error;
1342
1343         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1344         if (error)
1345                 goto setval_error;
1346
1347 setval_done:
1348         free(mac_addr);
1349         fclose(file);
1350
1351         /*
1352          * Now that we have populated the configuration file,
1353          * invoke the external script to do its magic.
1354          */
1355
1356         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1357         system(cmd);
1358         return 0;
1359
1360 setval_error:
1361         syslog(LOG_ERR, "Failed to write config file");
1362         free(mac_addr);
1363         fclose(file);
1364         return error;
1365 }
1366
1367
1368 static int
1369 kvp_get_domain_name(char *buffer, int length)
1370 {
1371         struct addrinfo hints, *info ;
1372         int error = 0;
1373
1374         gethostname(buffer, length);
1375         memset(&hints, 0, sizeof(hints));
1376         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1377         hints.ai_socktype = SOCK_STREAM;
1378         hints.ai_flags = AI_CANONNAME;
1379
1380         error = getaddrinfo(buffer, NULL, &hints, &info);
1381         if (error != 0) {
1382                 strcpy(buffer, "getaddrinfo failed\n");
1383                 return error;
1384         }
1385         strcpy(buffer, info->ai_canonname);
1386         freeaddrinfo(info);
1387         return error;
1388 }
1389
1390 static int
1391 netlink_send(int fd, struct cn_msg *msg)
1392 {
1393         struct nlmsghdr *nlh;
1394         unsigned int size;
1395         struct msghdr message;
1396         char buffer[64];
1397         struct iovec iov[2];
1398
1399         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
1400
1401         nlh = (struct nlmsghdr *)buffer;
1402         nlh->nlmsg_seq = 0;
1403         nlh->nlmsg_pid = getpid();
1404         nlh->nlmsg_type = NLMSG_DONE;
1405         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
1406         nlh->nlmsg_flags = 0;
1407
1408         iov[0].iov_base = nlh;
1409         iov[0].iov_len = sizeof(*nlh);
1410
1411         iov[1].iov_base = msg;
1412         iov[1].iov_len = size;
1413
1414         memset(&message, 0, sizeof(message));
1415         message.msg_name = &addr;
1416         message.msg_namelen = sizeof(addr);
1417         message.msg_iov = iov;
1418         message.msg_iovlen = 2;
1419
1420         return sendmsg(fd, &message, 0);
1421 }
1422
1423 int main(void)
1424 {
1425         int fd, len, nl_group;
1426         int error;
1427         struct cn_msg *message;
1428         struct pollfd pfd;
1429         struct nlmsghdr *incoming_msg;
1430         struct cn_msg   *incoming_cn_msg;
1431         struct hv_kvp_msg *hv_msg;
1432         char    *p;
1433         char    *key_value;
1434         char    *key_name;
1435         int     op;
1436         int     pool;
1437         char    *if_name;
1438         struct hv_kvp_ipaddr_value *kvp_ip_val;
1439
1440         daemon(1, 0);
1441         openlog("KVP", 0, LOG_USER);
1442         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1443         /*
1444          * Retrieve OS release information.
1445          */
1446         kvp_get_os_info();
1447
1448         if (kvp_file_init()) {
1449                 syslog(LOG_ERR, "Failed to initialize the pools");
1450                 exit(EXIT_FAILURE);
1451         }
1452
1453         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1454         if (fd < 0) {
1455                 syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
1456                                 strerror(errno));
1457                 exit(EXIT_FAILURE);
1458         }
1459         addr.nl_family = AF_NETLINK;
1460         addr.nl_pad = 0;
1461         addr.nl_pid = 0;
1462         addr.nl_groups = 0;
1463
1464
1465         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1466         if (error < 0) {
1467                 syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
1468                 close(fd);
1469                 exit(EXIT_FAILURE);
1470         }
1471         nl_group = CN_KVP_IDX;
1472
1473         if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
1474                 syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
1475                 close(fd);
1476                 exit(EXIT_FAILURE);
1477         }
1478
1479         /*
1480          * Register ourselves with the kernel.
1481          */
1482         message = (struct cn_msg *)kvp_send_buffer;
1483         message->id.idx = CN_KVP_IDX;
1484         message->id.val = CN_KVP_VAL;
1485
1486         hv_msg = (struct hv_kvp_msg *)message->data;
1487         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1488         message->ack = 0;
1489         message->len = sizeof(struct hv_kvp_msg);
1490
1491         len = netlink_send(fd, message);
1492         if (len < 0) {
1493                 syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
1494                 close(fd);
1495                 exit(EXIT_FAILURE);
1496         }
1497
1498         pfd.fd = fd;
1499
1500         while (1) {
1501                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1502                 socklen_t addr_l = sizeof(addr);
1503                 pfd.events = POLLIN;
1504                 pfd.revents = 0;
1505
1506                 if (poll(&pfd, 1, -1) < 0) {
1507                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1508                         if (errno == EINVAL) {
1509                                 close(fd);
1510                                 exit(EXIT_FAILURE);
1511                         }
1512                         else
1513                                 continue;
1514                 }
1515
1516                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
1517                                 addr_p, &addr_l);
1518
1519                 if (len < 0) {
1520                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1521                                         addr.nl_pid, errno, strerror(errno));
1522                         close(fd);
1523                         return -1;
1524                 }
1525
1526                 if (addr.nl_pid) {
1527                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1528                                         addr.nl_pid);
1529                         continue;
1530                 }
1531
1532                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1533
1534                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1535                         continue;
1536
1537                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1538                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1539
1540                 /*
1541                  * We will use the KVP header information to pass back
1542                  * the error from this daemon. So, first copy the state
1543                  * and set the error code to success.
1544                  */
1545                 op = hv_msg->kvp_hdr.operation;
1546                 pool = hv_msg->kvp_hdr.pool;
1547                 hv_msg->error = HV_S_OK;
1548
1549                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1550                         /*
1551                          * Driver is registering with us; stash away the version
1552                          * information.
1553                          */
1554                         in_hand_shake = 0;
1555                         p = (char *)hv_msg->body.kvp_register.version;
1556                         lic_version = malloc(strlen(p) + 1);
1557                         if (lic_version) {
1558                                 strcpy(lic_version, p);
1559                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1560                                         lic_version);
1561                         } else {
1562                                 syslog(LOG_ERR, "malloc failed");
1563                         }
1564                         continue;
1565                 }
1566
1567                 switch (op) {
1568                 case KVP_OP_GET_IP_INFO:
1569                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1570                         if_name =
1571                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1572
1573                         if (if_name == NULL) {
1574                                 /*
1575                                  * We could not map the mac address to an
1576                                  * interface name; return error.
1577                                  */
1578                                 hv_msg->error = HV_E_FAIL;
1579                                 break;
1580                         }
1581                         error = kvp_get_ip_info(
1582                                                 0, if_name, KVP_OP_GET_IP_INFO,
1583                                                 kvp_ip_val,
1584                                                 (MAX_IP_ADDR_SIZE * 2));
1585
1586                         if (error)
1587                                 hv_msg->error = error;
1588
1589                         free(if_name);
1590                         break;
1591
1592                 case KVP_OP_SET_IP_INFO:
1593                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1594                         if_name = kvp_get_if_name(
1595                                         (char *)kvp_ip_val->adapter_id);
1596                         if (if_name == NULL) {
1597                                 /*
1598                                  * We could not map the guid to an
1599                                  * interface name; return error.
1600                                  */
1601                                 hv_msg->error = HV_GUID_NOTFOUND;
1602                                 break;
1603                         }
1604                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1605                         if (error)
1606                                 hv_msg->error = error;
1607
1608                         free(if_name);
1609                         break;
1610
1611                 case KVP_OP_SET:
1612                         if (kvp_key_add_or_modify(pool,
1613                                         hv_msg->body.kvp_set.data.key,
1614                                         hv_msg->body.kvp_set.data.key_size,
1615                                         hv_msg->body.kvp_set.data.value,
1616                                         hv_msg->body.kvp_set.data.value_size))
1617                                         hv_msg->error = HV_S_CONT;
1618                         break;
1619
1620                 case KVP_OP_GET:
1621                         if (kvp_get_value(pool,
1622                                         hv_msg->body.kvp_set.data.key,
1623                                         hv_msg->body.kvp_set.data.key_size,
1624                                         hv_msg->body.kvp_set.data.value,
1625                                         hv_msg->body.kvp_set.data.value_size))
1626                                         hv_msg->error = HV_S_CONT;
1627                         break;
1628
1629                 case KVP_OP_DELETE:
1630                         if (kvp_key_delete(pool,
1631                                         hv_msg->body.kvp_delete.key,
1632                                         hv_msg->body.kvp_delete.key_size))
1633                                         hv_msg->error = HV_S_CONT;
1634                         break;
1635
1636                 default:
1637                         break;
1638                 }
1639
1640                 if (op != KVP_OP_ENUMERATE)
1641                         goto kvp_done;
1642
1643                 /*
1644                  * If the pool is KVP_POOL_AUTO, dynamically generate
1645                  * both the key and the value; if not read from the
1646                  * appropriate pool.
1647                  */
1648                 if (pool != KVP_POOL_AUTO) {
1649                         if (kvp_pool_enumerate(pool,
1650                                         hv_msg->body.kvp_enum_data.index,
1651                                         hv_msg->body.kvp_enum_data.data.key,
1652                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1653                                         hv_msg->body.kvp_enum_data.data.value,
1654                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1655                                         hv_msg->error = HV_S_CONT;
1656                         goto kvp_done;
1657                 }
1658
1659                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1660                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1661                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1662
1663                 switch (hv_msg->body.kvp_enum_data.index) {
1664                 case FullyQualifiedDomainName:
1665                         kvp_get_domain_name(key_value,
1666                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1667                         strcpy(key_name, "FullyQualifiedDomainName");
1668                         break;
1669                 case IntegrationServicesVersion:
1670                         strcpy(key_name, "IntegrationServicesVersion");
1671                         strcpy(key_value, lic_version);
1672                         break;
1673                 case NetworkAddressIPv4:
1674                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1675                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1676                         strcpy(key_name, "NetworkAddressIPv4");
1677                         break;
1678                 case NetworkAddressIPv6:
1679                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1680                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1681                         strcpy(key_name, "NetworkAddressIPv6");
1682                         break;
1683                 case OSBuildNumber:
1684                         strcpy(key_value, os_build);
1685                         strcpy(key_name, "OSBuildNumber");
1686                         break;
1687                 case OSName:
1688                         strcpy(key_value, os_name);
1689                         strcpy(key_name, "OSName");
1690                         break;
1691                 case OSMajorVersion:
1692                         strcpy(key_value, os_major);
1693                         strcpy(key_name, "OSMajorVersion");
1694                         break;
1695                 case OSMinorVersion:
1696                         strcpy(key_value, os_minor);
1697                         strcpy(key_name, "OSMinorVersion");
1698                         break;
1699                 case OSVersion:
1700                         strcpy(key_value, os_version);
1701                         strcpy(key_name, "OSVersion");
1702                         break;
1703                 case ProcessorArchitecture:
1704                         strcpy(key_value, processor_arch);
1705                         strcpy(key_name, "ProcessorArchitecture");
1706                         break;
1707                 default:
1708                         hv_msg->error = HV_S_CONT;
1709                         break;
1710                 }
1711                 /*
1712                  * Send the value back to the kernel. The response is
1713                  * already in the receive buffer. Update the cn_msg header to
1714                  * reflect the key value that has been added to the message
1715                  */
1716 kvp_done:
1717
1718                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1719                 incoming_cn_msg->id.val = CN_KVP_VAL;
1720                 incoming_cn_msg->ack = 0;
1721                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1722
1723                 len = netlink_send(fd, incoming_cn_msg);
1724                 if (len < 0) {
1725                         syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
1726                                         strerror(errno));
1727                         exit(EXIT_FAILURE);
1728                 }
1729         }
1730
1731 }