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 <stdio.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <errno.h>
  35 #include <arpa/inet.h>
  36 #include <linux/connector.h>
  37 #include <linux/hyperv.h>
  38 #include <linux/netlink.h>
  39 #include <ifaddrs.h>
  40 #include <netdb.h>
  41 #include <syslog.h>
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44 #include <dirent.h>
  45 #include <net/if.h>
  46
  47 /*
  48  * KVP protocol: The user mode component first registers with the
  49  * the kernel component. Subsequently, the kernel component requests, data
  50  * for the specified keys. In response to this message the user mode component
  51  * fills in the value corresponding to the specified key. We overload the
  52  * sequence field in the cn_msg header to define our KVP message types.
  53  *
  54  * We use this infrastructure for also supporting queries from user mode
  55  * application for state that may be maintained in the KVP kernel component.
  56  *
  57  */
  58
  59
  60 enum key_index {
  61         FullyQualifiedDomainName = 0,
  62         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  63         NetworkAddressIPv4,
  64         NetworkAddressIPv6,
  65         OSBuildNumber,
  66         OSName,
  67         OSMajorVersion,
  68         OSMinorVersion,
  69         OSVersion,
  70         ProcessorArchitecture
  71 };
  72
  73
  74 enum {
  75         IPADDR = 0,
  76         NETMASK,
  77         GATEWAY,
  78         DNS
  79 };
  80
  81 static struct sockaddr_nl addr;
  82 static int in_hand_shake = 1;
  83
  84 static char *os_name = "";
  85 static char *os_major = "";
  86 static char *os_minor = "";
  87 static char *processor_arch;
  88 static char *os_build;
  89 static char *os_version;
  90 static char *lic_version = "Unknown version";
  91 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  92 static struct utsname uts_buf;
  93
  94 /*
  95  * The location of the interface configuration file.
  96  */
  97
  98 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
  99
 100 #define MAX_FILE_NAME 100
 101 #define ENTRIES_PER_BLOCK 50
 102
 103 #ifndef SOL_NETLINK
 104 #define SOL_NETLINK 270
 105 #endif
 106
 107 struct kvp_record {
 108         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 109         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 110 };
 111
 112 struct kvp_file_state {
 113         int fd;
 114         int num_blocks;
 115         struct kvp_record *records;
 116         int num_records;
 117         char fname[MAX_FILE_NAME];
 118 };
 119
 120 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 121
 122 static void kvp_acquire_lock(int pool)
 123 {
 124         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 125         fl.l_pid = getpid();
 126
 127         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 128                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 129                                 errno, strerror(errno));
 130                 exit(EXIT_FAILURE);
 131         }
 132 }
 133
 134 static void kvp_release_lock(int pool)
 135 {
 136         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 137         fl.l_pid = getpid();
 138
 139         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 140                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 141                                 errno, strerror(errno));
 142                 exit(EXIT_FAILURE);
 143         }
 144 }
 145
 146 static void kvp_update_file(int pool)
 147 {
 148         FILE *filep;
 149         size_t bytes_written;
 150
 151         /*
 152          * We are going to write our in-memory registry out to
 153          * disk; acquire the lock first.
 154          */
 155         kvp_acquire_lock(pool);
 156
 157         filep = fopen(kvp_file_info[pool].fname, "we");
 158         if (!filep) {
 159                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 160                                 errno, strerror(errno));
 161                 kvp_release_lock(pool);
 162                 exit(EXIT_FAILURE);
 163         }
 164
 165         bytes_written = fwrite(kvp_file_info[pool].records,
 166                                 sizeof(struct kvp_record),
 167                                 kvp_file_info[pool].num_records, filep);
 168
 169         if (ferror(filep) || fclose(filep)) {
 170                 kvp_release_lock(pool);
 171                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 172                 exit(EXIT_FAILURE);
 173         }
 174
 175         kvp_release_lock(pool);
 176 }
 177
 178 static void kvp_update_mem_state(int pool)
 179 {
 180         FILE *filep;
 181         size_t records_read = 0;
 182         struct kvp_record *record = kvp_file_info[pool].records;
 183         struct kvp_record *readp;
 184         int num_blocks = kvp_file_info[pool].num_blocks;
 185         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 186
 187         kvp_acquire_lock(pool);
 188
 189         filep = fopen(kvp_file_info[pool].fname, "re");
 190         if (!filep) {
 191                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 192                                 errno, strerror(errno));
 193                 kvp_release_lock(pool);
 194                 exit(EXIT_FAILURE);
 195         }
 196         for (;;) {
 197                 readp = &record[records_read];
 198                 records_read += fread(readp, sizeof(struct kvp_record),
 199                                         ENTRIES_PER_BLOCK * num_blocks,
 200                                         filep);
 201
 202                 if (ferror(filep)) {
 203                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
 204                         exit(EXIT_FAILURE);
 205                 }
 206
 207                 if (!feof(filep)) {
 208                         /*
 209                          * We have more data to read.
 210                          */
 211                         num_blocks++;
 212                         record = realloc(record, alloc_unit * num_blocks);
 213
 214                         if (record == NULL) {
 215                                 syslog(LOG_ERR, "malloc failed");
 216                                 exit(EXIT_FAILURE);
 217                         }
 218                         continue;
 219                 }
 220                 break;
 221         }
 222
 223         kvp_file_info[pool].num_blocks = num_blocks;
 224         kvp_file_info[pool].records = record;
 225         kvp_file_info[pool].num_records = records_read;
 226
 227         fclose(filep);
 228         kvp_release_lock(pool);
 229 }
 230 static int kvp_file_init(void)
 231 {
 232         int  fd;
 233         FILE *filep;
 234         size_t records_read;
 235         char *fname;
 236         struct kvp_record *record;
 237         struct kvp_record *readp;
 238         int num_blocks;
 239         int i;
 240         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 241
 242         if (access(KVP_CONFIG_LOC, F_OK)) {
 243                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 244                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
 245                                         errno, strerror(errno));
 246                         exit(EXIT_FAILURE);
 247                 }
 248         }
 249
 250         for (i = 0; i < KVP_POOL_COUNT; i++) {
 251                 fname = kvp_file_info[i].fname;
 252                 records_read = 0;
 253                 num_blocks = 1;
 254                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 255                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 256
 257                 if (fd == -1)
 258                         return 1;
 259
 260
 261                 filep = fopen(fname, "re");
 262                 if (!filep) {
 263                         close(fd);
 264                         return 1;
 265                 }
 266
 267                 record = malloc(alloc_unit * num_blocks);
 268                 if (record == NULL) {
 269                         fclose(filep);
 270                         close(fd);
 271                         return 1;
 272                 }
 273                 for (;;) {
 274                         readp = &record[records_read];
 275                         records_read += fread(readp, sizeof(struct kvp_record),
 276                                         ENTRIES_PER_BLOCK,
 277                                         filep);
 278
 279                         if (ferror(filep)) {
 280                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 281                                        i);
 282                                 exit(EXIT_FAILURE);
 283                         }
 284
 285                         if (!feof(filep)) {
 286                                 /*
 287                                  * We have more data to read.
 288                                  */
 289                                 num_blocks++;
 290                                 record = realloc(record, alloc_unit *
 291                                                 num_blocks);
 292                                 if (record == NULL) {
 293                                         fclose(filep);
 294                                         close(fd);
 295                                         return 1;
 296                                 }
 297                                 continue;
 298                         }
 299                         break;
 300                 }
 301                 kvp_file_info[i].fd = fd;
 302                 kvp_file_info[i].num_blocks = num_blocks;
 303                 kvp_file_info[i].records = record;
 304                 kvp_file_info[i].num_records = records_read;
 305                 fclose(filep);
 306
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int kvp_key_delete(int pool, const char *key, int key_size)
 313 {
 314         int i;
 315         int j, k;
 316         int num_records;
 317         struct kvp_record *record;
 318
 319         /*
 320          * First update the in-memory state.
 321          */
 322         kvp_update_mem_state(pool);
 323
 324         num_records = kvp_file_info[pool].num_records;
 325         record = kvp_file_info[pool].records;
 326
 327         for (i = 0; i < num_records; i++) {
 328                 if (memcmp(key, record[i].key, key_size))
 329                         continue;
 330                 /*
 331                  * Found a match; just move the remaining
 332                  * entries up.
 333                  */
 334                 if (i == num_records) {
 335                         kvp_file_info[pool].num_records--;
 336                         kvp_update_file(pool);
 337                         return 0;
 338                 }
 339
 340                 j = i;
 341                 k = j + 1;
 342                 for (; k < num_records; k++) {
 343                         strcpy(record[j].key, record[k].key);
 344                         strcpy(record[j].value, record[k].value);
 345                         j++;
 346                 }
 347
 348                 kvp_file_info[pool].num_records--;
 349                 kvp_update_file(pool);
 350                 return 0;
 351         }
 352         return 1;
 353 }
 354
 355 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
 356                         int value_size)
 357 {
 358         int i;
 359         int num_records;
 360         struct kvp_record *record;
 361         int num_blocks;
 362
 363         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 364                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 365                 return 1;
 366
 367         /*
 368          * First update the in-memory state.
 369          */
 370         kvp_update_mem_state(pool);
 371
 372         num_records = kvp_file_info[pool].num_records;
 373         record = kvp_file_info[pool].records;
 374         num_blocks = kvp_file_info[pool].num_blocks;
 375
 376         for (i = 0; i < num_records; i++) {
 377                 if (memcmp(key, record[i].key, key_size))
 378                         continue;
 379                 /*
 380                  * Found a match; just update the value -
 381                  * this is the modify case.
 382                  */
 383                 memcpy(record[i].value, value, value_size);
 384                 kvp_update_file(pool);
 385                 return 0;
 386         }
 387
 388         /*
 389          * Need to add a new entry;
 390          */
 391         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 392                 /* Need to allocate a larger array for reg entries. */
 393                 record = realloc(record, sizeof(struct kvp_record) *
 394                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 395
 396                 if (record == NULL)
 397                         return 1;
 398                 kvp_file_info[pool].num_blocks++;
 399
 400         }
 401         memcpy(record[i].value, value, value_size);
 402         memcpy(record[i].key, key, key_size);
 403         kvp_file_info[pool].records = record;
 404         kvp_file_info[pool].num_records++;
 405         kvp_update_file(pool);
 406         return 0;
 407 }
 408
 409 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
 410                         int value_size)
 411 {
 412         int i;
 413         int num_records;
 414         struct kvp_record *record;
 415
 416         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 417                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 418                 return 1;
 419
 420         /*
 421          * First update the in-memory state.
 422          */
 423         kvp_update_mem_state(pool);
 424
 425         num_records = kvp_file_info[pool].num_records;
 426         record = kvp_file_info[pool].records;
 427
 428         for (i = 0; i < num_records; i++) {
 429                 if (memcmp(key, record[i].key, key_size))
 430                         continue;
 431                 /*
 432                  * Found a match; just copy the value out.
 433                  */
 434                 memcpy(value, record[i].value, value_size);
 435                 return 0;
 436         }
 437
 438         return 1;
 439 }
 440
 441 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
 442                                 char *value, int value_size)
 443 {
 444         struct kvp_record *record;
 445
 446         /*
 447          * First update our in-memory database.
 448          */
 449         kvp_update_mem_state(pool);
 450         record = kvp_file_info[pool].records;
 451
 452         if (index >= kvp_file_info[pool].num_records) {
 453                 return 1;
 454         }
 455
 456         memcpy(key, record[index].key, key_size);
 457         memcpy(value, record[index].value, value_size);
 458         return 0;
 459 }
 460
 461
 462 void kvp_get_os_info(void)
 463 {
 464         FILE    *file;
 465         char    *p, buf[512];
 466
 467         uname(&uts_buf);
 468         os_version = uts_buf.release;
 469         os_build = strdup(uts_buf.release);
 470
 471         os_name = uts_buf.sysname;
 472         processor_arch = uts_buf.machine;
 473
 474         /*
 475          * The current windows host (win7) expects the build
 476          * string to be of the form: x.y.z
 477          * Strip additional information we may have.
 478          */
 479         p = strchr(os_version, '-');
 480         if (p)
 481                 *p = '\0';
 482
 483         /*
 484          * Parse the /etc/os-release file if present:
 485          * http://www.freedesktop.org/software/systemd/man/os-release.html
 486          */
 487         file = fopen("/etc/os-release", "r");
 488         if (file != NULL) {
 489                 while (fgets(buf, sizeof(buf), file)) {
 490                         char *value, *q;
 491
 492                         /* Ignore comments */
 493                         if (buf[0] == '#')
 494                                 continue;
 495
 496                         /* Split into name=value */
 497                         p = strchr(buf, '=');
 498                         if (!p)
 499                                 continue;
 500                         *p++ = 0;
 501
 502                         /* Remove quotes and newline; un-escape */
 503                         value = p;
 504                         q = p;
 505                         while (*p) {
 506                                 if (*p == '\\') {
 507                                         ++p;
 508                                         if (!*p)
 509                                                 break;
 510                                         *q++ = *p++;
 511                                 } else if (*p == '\'' || *p == '"' ||
 512                                            *p == '\n') {
 513                                         ++p;
 514                                 } else {
 515                                         *q++ = *p++;
 516                                 }
 517                         }
 518                         *q = 0;
 519
 520                         if (!strcmp(buf, "NAME")) {
 521                                 p = strdup(value);
 522                                 if (!p)
 523                                         break;
 524                                 os_name = p;
 525                         } else if (!strcmp(buf, "VERSION_ID")) {
 526                                 p = strdup(value);
 527                                 if (!p)
 528                                         break;
 529                                 os_major = p;
 530                         }
 531                 }
 532                 fclose(file);
 533                 return;
 534         }
 535
 536         /* Fallback for older RH/SUSE releases */
 537         file = fopen("/etc/SuSE-release", "r");
 538         if (file != NULL)
 539                 goto kvp_osinfo_found;
 540         file  = fopen("/etc/redhat-release", "r");
 541         if (file != NULL)
 542                 goto kvp_osinfo_found;
 543
 544         /*
 545          * We don't have information about the os.
 546          */
 547         return;
 548
 549 kvp_osinfo_found:
 550         /* up to three lines */
 551         p = fgets(buf, sizeof(buf), file);
 552         if (p) {
 553                 p = strchr(buf, '\n');
 554                 if (p)
 555                         *p = '\0';
 556                 p = strdup(buf);
 557                 if (!p)
 558                         goto done;
 559                 os_name = p;
 560
 561                 /* second line */
 562                 p = fgets(buf, sizeof(buf), file);
 563                 if (p) {
 564                         p = strchr(buf, '\n');
 565                         if (p)
 566                                 *p = '\0';
 567                         p = strdup(buf);
 568                         if (!p)
 569                                 goto done;
 570                         os_major = p;
 571
 572                         /* third line */
 573                         p = fgets(buf, sizeof(buf), file);
 574                         if (p)  {
 575                                 p = strchr(buf, '\n');
 576                                 if (p)
 577                                         *p = '\0';
 578                                 p = strdup(buf);
 579                                 if (p)
 580                                         os_minor = p;
 581                         }
 582                 }
 583         }
 584
 585 done:
 586         fclose(file);
 587         return;
 588 }
 589
 590
 591
 592 /*
 593  * Retrieve an interface name corresponding to the specified guid.
 594  * If there is a match, the function returns a pointer
 595  * to the interface name and if not, a NULL is returned.
 596  * If a match is found, the caller is responsible for
 597  * freeing the memory.
 598  */
 599
 600 static char *kvp_get_if_name(char *guid)
 601 {
 602         DIR *dir;
 603         struct dirent *entry;
 604         FILE    *file;
 605         char    *p, *q, *x;
 606         char    *if_name = NULL;
 607         char    buf[256];
 608         char *kvp_net_dir = "/sys/class/net/";
 609         char dev_id[256];
 610
 611         dir = opendir(kvp_net_dir);
 612         if (dir == NULL)
 613                 return NULL;
 614
 615         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 616         q = dev_id + strlen(kvp_net_dir);
 617
 618         while ((entry = readdir(dir)) != NULL) {
 619                 /*
 620                  * Set the state for the next pass.
 621                  */
 622                 *q = '\0';
 623                 strcat(dev_id, entry->d_name);
 624                 strcat(dev_id, "/device/device_id");
 625
 626                 file = fopen(dev_id, "r");
 627                 if (file == NULL)
 628                         continue;
 629
 630                 p = fgets(buf, sizeof(buf), file);
 631                 if (p) {
 632                         x = strchr(p, '\n');
 633                         if (x)
 634                                 *x = '\0';
 635
 636                         if (!strcmp(p, guid)) {
 637                                 /*
 638                                  * Found the guid match; return the interface
 639                                  * name. The caller will free the memory.
 640                                  */
 641                                 if_name = strdup(entry->d_name);
 642                                 fclose(file);
 643                                 break;
 644                         }
 645                 }
 646                 fclose(file);
 647         }
 648
 649         closedir(dir);
 650         return if_name;
 651 }
 652
 653 /*
 654  * Retrieve the MAC address given the interface name.
 655  */
 656
 657 static char *kvp_if_name_to_mac(char *if_name)
 658 {
 659         FILE    *file;
 660         char    *p, *x;
 661         char    buf[256];
 662         char addr_file[256];
 663         int i;
 664         char *mac_addr = NULL;
 665
 666         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 667                 if_name, "/address");
 668
 669         file = fopen(addr_file, "r");
 670         if (file == NULL)
 671                 return NULL;
 672
 673         p = fgets(buf, sizeof(buf), file);
 674         if (p) {
 675                 x = strchr(p, '\n');
 676                 if (x)
 677                         *x = '\0';
 678                 for (i = 0; i < strlen(p); i++)
 679                         p[i] = toupper(p[i]);
 680                 mac_addr = strdup(p);
 681         }
 682
 683         fclose(file);
 684         return mac_addr;
 685 }
 686
 687
 688 /*
 689  * Retrieve the interface name given tha MAC address.
 690  */
 691
 692 static char *kvp_mac_to_if_name(char *mac)
 693 {
 694         DIR *dir;
 695         struct dirent *entry;
 696         FILE    *file;
 697         char    *p, *q, *x;
 698         char    *if_name = NULL;
 699         char    buf[256];
 700         char *kvp_net_dir = "/sys/class/net/";
 701         char dev_id[256];
 702         int i;
 703
 704         dir = opendir(kvp_net_dir);
 705         if (dir == NULL)
 706                 return NULL;
 707
 708         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 709         q = dev_id + strlen(kvp_net_dir);
 710
 711         while ((entry = readdir(dir)) != NULL) {
 712                 /*
 713                  * Set the state for the next pass.
 714                  */
 715                 *q = '\0';
 716
 717                 strcat(dev_id, entry->d_name);
 718                 strcat(dev_id, "/address");
 719
 720                 file = fopen(dev_id, "r");
 721                 if (file == NULL)
 722                         continue;
 723
 724                 p = fgets(buf, sizeof(buf), file);
 725                 if (p) {
 726                         x = strchr(p, '\n');
 727                         if (x)
 728                                 *x = '\0';
 729
 730                         for (i = 0; i < strlen(p); i++)
 731                                 p[i] = toupper(p[i]);
 732
 733                         if (!strcmp(p, mac)) {
 734                                 /*
 735                                  * Found the MAC match; return the interface
 736                                  * name. The caller will free the memory.
 737                                  */
 738                                 if_name = strdup(entry->d_name);
 739                                 fclose(file);
 740                                 break;
 741                         }
 742                 }
 743                 fclose(file);
 744         }
 745
 746         closedir(dir);
 747         return if_name;
 748 }
 749
 750
 751 static void kvp_process_ipconfig_file(char *cmd,
 752                                         char *config_buf, int len,
 753                                         int element_size, int offset)
 754 {
 755         char buf[256];
 756         char *p;
 757         char *x;
 758         FILE *file;
 759
 760         /*
 761          * First execute the command.
 762          */
 763         file = popen(cmd, "r");
 764         if (file == NULL)
 765                 return;
 766
 767         if (offset == 0)
 768                 memset(config_buf, 0, len);
 769         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 770                 if ((len - strlen(config_buf)) < (element_size + 1))
 771                         break;
 772
 773                 x = strchr(p, '\n');
 774                 if (x)
 775                         *x = '\0';
 776
 777                 strcat(config_buf, p);
 778                 strcat(config_buf, ";");
 779         }
 780         pclose(file);
 781 }
 782
 783 static void kvp_get_ipconfig_info(char *if_name,
 784                                  struct hv_kvp_ipaddr_value *buffer)
 785 {
 786         char cmd[512];
 787         char dhcp_info[128];
 788         char *p;
 789         FILE *file;
 790
 791         /*
 792          * Get the address of default gateway (ipv4).
 793          */
 794         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 795         strcat(cmd, " | awk '/default/ {print $3 }'");
 796
 797         /*
 798          * Execute the command to gather gateway info.
 799          */
 800         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 801                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 802
 803         /*
 804          * Get the address of default gateway (ipv6).
 805          */
 806         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 807         strcat(cmd, " | awk '/default/ {print $3 }'");
 808
 809         /*
 810          * Execute the command to gather gateway info (ipv6).
 811          */
 812         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 813                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 814
 815
 816         /*
 817          * Gather the DNS  state.
 818          * Since there is no standard way to get this information
 819          * across various distributions of interest; we just invoke
 820          * an external script that needs to be ported across distros
 821          * of interest.
 822          *
 823          * Following is the expected format of the information from the script:
 824          *
 825          * ipaddr1 (nameserver1)
 826          * ipaddr2 (nameserver2)
 827          * .
 828          * .
 829          */
 830
 831         sprintf(cmd, "%s",  "hv_get_dns_info");
 832
 833         /*
 834          * Execute the command to gather DNS info.
 835          */
 836         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 837                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 838
 839         /*
 840          * Gather the DHCP state.
 841          * We will gather this state by invoking an external script.
 842          * The parameter to the script is the interface name.
 843          * Here is the expected output:
 844          *
 845          * Enabled: DHCP enabled.
 846          */
 847
 848         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 849
 850         file = popen(cmd, "r");
 851         if (file == NULL)
 852                 return;
 853
 854         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 855         if (p == NULL) {
 856                 pclose(file);
 857                 return;
 858         }
 859
 860         if (!strncmp(p, "Enabled", 7))
 861                 buffer->dhcp_enabled = 1;
 862         else
 863                 buffer->dhcp_enabled = 0;
 864
 865         pclose(file);
 866 }
 867
 868
 869 static unsigned int hweight32(unsigned int *w)
 870 {
 871         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 872         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 873         res = (res + (res >> 4)) & 0x0F0F0F0F;
 874         res = res + (res >> 8);
 875         return (res + (res >> 16)) & 0x000000FF;
 876 }
 877
 878 static int kvp_process_ip_address(void *addrp,
 879                                 int family, char *buffer,
 880                                 int length,  int *offset)
 881 {
 882         struct sockaddr_in *addr;
 883         struct sockaddr_in6 *addr6;
 884         int addr_length;
 885         char tmp[50];
 886         const char *str;
 887
 888         if (family == AF_INET) {
 889                 addr = (struct sockaddr_in *)addrp;
 890                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 891                 addr_length = INET_ADDRSTRLEN;
 892         } else {
 893                 addr6 = (struct sockaddr_in6 *)addrp;
 894                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 895                 addr_length = INET6_ADDRSTRLEN;
 896         }
 897
 898         if ((length - *offset) < addr_length + 2)
 899                 return HV_E_FAIL;
 900         if (str == NULL) {
 901                 strcpy(buffer, "inet_ntop failed\n");
 902                 return HV_E_FAIL;
 903         }
 904         if (*offset == 0)
 905                 strcpy(buffer, tmp);
 906         else {
 907                 strcat(buffer, ";");
 908                 strcat(buffer, tmp);
 909         }
 910
 911         *offset += strlen(str) + 1;
 912
 913         return 0;
 914 }
 915
 916 static int
 917 kvp_get_ip_info(int family, char *if_name, int op,
 918                  void  *out_buffer, int length)
 919 {
 920         struct ifaddrs *ifap;
 921         struct ifaddrs *curp;
 922         int offset = 0;
 923         int sn_offset = 0;
 924         int error = 0;
 925         char *buffer;
 926         struct hv_kvp_ipaddr_value *ip_buffer;
 927         char cidr_mask[5]; /* /xyz */
 928         int weight;
 929         int i;
 930         unsigned int *w;
 931         char *sn_str;
 932         struct sockaddr_in6 *addr6;
 933
 934         if (op == KVP_OP_ENUMERATE) {
 935                 buffer = out_buffer;
 936         } else {
 937                 ip_buffer = out_buffer;
 938                 buffer = (char *)ip_buffer->ip_addr;
 939                 ip_buffer->addr_family = 0;
 940         }
 941         /*
 942          * On entry into this function, the buffer is capable of holding the
 943          * maximum key value.
 944          */
 945
 946         if (getifaddrs(&ifap)) {
 947                 strcpy(buffer, "getifaddrs failed\n");
 948                 return HV_E_FAIL;
 949         }
 950
 951         curp = ifap;
 952         while (curp != NULL) {
 953                 if (curp->ifa_addr == NULL) {
 954                         curp = curp->ifa_next;
 955                         continue;
 956                 }
 957
 958                 if ((if_name != NULL) &&
 959                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 960                         /*
 961                          * We want info about a specific interface;
 962                          * just continue.
 963                          */
 964                         curp = curp->ifa_next;
 965                         continue;
 966                 }
 967
 968                 /*
 969                  * We only support two address families: AF_INET and AF_INET6.
 970                  * If a family value of 0 is specified, we collect both
 971                  * supported address families; if not we gather info on
 972                  * the specified address family.
 973                  */
 974                 if ((((family != 0) &&
 975                          (curp->ifa_addr->sa_family != family))) ||
 976                          (curp->ifa_flags & IFF_LOOPBACK)) {
 977                         curp = curp->ifa_next;
 978                         continue;
 979                 }
 980                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 981                         (curp->ifa_addr->sa_family != AF_INET6)) {
 982                         curp = curp->ifa_next;
 983                         continue;
 984                 }
 985
 986                 if (op == KVP_OP_GET_IP_INFO) {
 987                         /*
 988                          * Gather info other than the IP address.
 989                          * IP address info will be gathered later.
 990                          */
 991                         if (curp->ifa_addr->sa_family == AF_INET) {
 992                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 993                                 /*
 994                                  * Get subnet info.
 995                                  */
 996                                 error = kvp_process_ip_address(
 997                                                              curp->ifa_netmask,
 998                                                              AF_INET,
 999                                                              (char *)
1000                                                              ip_buffer->sub_net,
1001                                                              length,
1002                                                              &sn_offset);
1003                                 if (error)
1004                                         goto gather_ipaddr;
1005                         } else {
1006                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1007
1008                                 /*
1009                                  * Get subnet info in CIDR format.
1010                                  */
1011                                 weight = 0;
1012                                 sn_str = (char *)ip_buffer->sub_net;
1013                                 addr6 = (struct sockaddr_in6 *)
1014                                         curp->ifa_netmask;
1015                                 w = addr6->sin6_addr.s6_addr32;
1016
1017                                 for (i = 0; i < 4; i++)
1018                                         weight += hweight32(&w[i]);
1019
1020                                 sprintf(cidr_mask, "/%d", weight);
1021                                 if ((length - sn_offset) <
1022                                         (strlen(cidr_mask) + 1))
1023                                         goto gather_ipaddr;
1024
1025                                 if (sn_offset == 0)
1026                                         strcpy(sn_str, cidr_mask);
1027                                 else {
1028                                         strcat((char *)ip_buffer->sub_net, ";");
1029                                         strcat(sn_str, cidr_mask);
1030                                 }
1031                                 sn_offset += strlen(sn_str) + 1;
1032                         }
1033
1034                         /*
1035                          * Collect other ip related configuration info.
1036                          */
1037
1038                         kvp_get_ipconfig_info(if_name, ip_buffer);
1039                 }
1040
1041 gather_ipaddr:
1042                 error = kvp_process_ip_address(curp->ifa_addr,
1043                                                 curp->ifa_addr->sa_family,
1044                                                 buffer,
1045                                                 length, &offset);
1046                 if (error)
1047                         goto getaddr_done;
1048
1049                 curp = curp->ifa_next;
1050         }
1051
1052 getaddr_done:
1053         freeifaddrs(ifap);
1054         return error;
1055 }
1056
1057
1058 static int expand_ipv6(char *addr, int type)
1059 {
1060         int ret;
1061         struct in6_addr v6_addr;
1062
1063         ret = inet_pton(AF_INET6, addr, &v6_addr);
1064
1065         if (ret != 1) {
1066                 if (type == NETMASK)
1067                         return 1;
1068                 return 0;
1069         }
1070
1071         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1072                 "%02x%02x:%02x%02x:%02x%02x",
1073                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1074                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1075                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1076                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1077                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1078                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1079                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1080                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1081
1082         return 1;
1083
1084 }
1085
1086 static int is_ipv4(char *addr)
1087 {
1088         int ret;
1089         struct in_addr ipv4_addr;
1090
1091         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1092
1093         if (ret == 1)
1094                 return 1;
1095         return 0;
1096 }
1097
1098 static int parse_ip_val_buffer(char *in_buf, int *offset,
1099                                 char *out_buf, int out_len)
1100 {
1101         char *x;
1102         char *start;
1103
1104         /*
1105          * in_buf has sequence of characters that are seperated by
1106          * the character ';'. The last sequence does not have the
1107          * terminating ";" character.
1108          */
1109         start = in_buf + *offset;
1110
1111         x = strchr(start, ';');
1112         if (x)
1113                 *x = 0;
1114         else
1115                 x = start + strlen(start);
1116
1117         if (strlen(start) != 0) {
1118                 int i = 0;
1119                 /*
1120                  * Get rid of leading spaces.
1121                  */
1122                 while (start[i] == ' ')
1123                         i++;
1124
1125                 if ((x - start) <= out_len) {
1126                         strcpy(out_buf, (start + i));
1127                         *offset += (x - start) + 1;
1128                         return 1;
1129                 }
1130         }
1131         return 0;
1132 }
1133
1134 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1135 {
1136         int ret;
1137
1138         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1139
1140         if (ret < 0)
1141                 return HV_E_FAIL;
1142
1143         return 0;
1144 }
1145
1146
1147 static int process_ip_string(FILE *f, char *ip_string, int type)
1148 {
1149         int error = 0;
1150         char addr[INET6_ADDRSTRLEN];
1151         int i = 0;
1152         int j = 0;
1153         char str[256];
1154         char sub_str[10];
1155         int offset = 0;
1156
1157         memset(addr, 0, sizeof(addr));
1158
1159         while (parse_ip_val_buffer(ip_string, &offset, addr,
1160                                         (MAX_IP_ADDR_SIZE * 2))) {
1161
1162                 sub_str[0] = 0;
1163                 if (is_ipv4(addr)) {
1164                         switch (type) {
1165                         case IPADDR:
1166                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1167                                 break;
1168                         case NETMASK:
1169                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1170                                 break;
1171                         case GATEWAY:
1172                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1173                                 break;
1174                         case DNS:
1175                                 snprintf(str, sizeof(str), "%s", "DNS");
1176                                 break;
1177                         }
1178
1179                         if (type == DNS) {
1180                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1181                         } else if (type == GATEWAY && i == 0) {
1182                                 ++i;
1183                         } else {
1184                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1185                         }
1186
1187
1188                 } else if (expand_ipv6(addr, type)) {
1189                         switch (type) {
1190                         case IPADDR:
1191                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1192                                 break;
1193                         case NETMASK:
1194                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1195                                 break;
1196                         case GATEWAY:
1197                                 snprintf(str, sizeof(str), "%s",
1198                                         "IPV6_DEFAULTGW");
1199                                 break;
1200                         case DNS:
1201                                 snprintf(str, sizeof(str), "%s",  "DNS");
1202                                 break;
1203                         }
1204
1205                         if (type == DNS) {
1206                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1207                         } else if (j == 0) {
1208                                 ++j;
1209                         } else {
1210                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1211                         }
1212                 } else {
1213                         return  HV_INVALIDARG;
1214                 }
1215
1216                 error = kvp_write_file(f, str, sub_str, addr);
1217                 if (error)
1218                         return error;
1219                 memset(addr, 0, sizeof(addr));
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1226 {
1227         int error = 0;
1228         char if_file[128];
1229         FILE *file;
1230         char cmd[512];
1231         char *mac_addr;
1232
1233         /*
1234          * Set the configuration for the specified interface with
1235          * the information provided. Since there is no standard
1236          * way to configure an interface, we will have an external
1237          * script that does the job of configuring the interface and
1238          * flushing the configuration.
1239          *
1240          * The parameters passed to this external script are:
1241          * 1. A configuration file that has the specified configuration.
1242          *
1243          * We will embed the name of the interface in the configuration
1244          * file: ifcfg-ethx (where ethx is the interface name).
1245          *
1246          * The information provided here may be more than what is needed
1247          * in a given distro to configure the interface and so are free
1248          * ignore information that may not be relevant.
1249          *
1250          * Here is the format of the ip configuration file:
1251          *
1252          * HWADDR=macaddr
1253          * DEVICE=interface name
1254          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1255          *                       or "none" if no boot-time protocol should be used)
1256          *
1257          * IPADDR0=ipaddr1
1258          * IPADDR1=ipaddr2
1259          * IPADDRx=ipaddry (where y = x + 1)
1260          *
1261          * NETMASK0=netmask1
1262          * NETMASKx=netmasky (where y = x + 1)
1263          *
1264          * GATEWAY=ipaddr1
1265          * GATEWAYx=ipaddry (where y = x + 1)
1266          *
1267          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1268          *
1269          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1270          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1271          * IPV6NETMASK.
1272          *
1273          * The host can specify multiple ipv4 and ipv6 addresses to be
1274          * configured for the interface. Furthermore, the configuration
1275          * needs to be persistent. A subsequent GET call on the interface
1276          * is expected to return the configuration that is set via the SET
1277          * call.
1278          */
1279
1280         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1281                 "/ifcfg-", if_name);
1282
1283         file = fopen(if_file, "w");
1284
1285         if (file == NULL) {
1286                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1287                                 errno, strerror(errno));
1288                 return HV_E_FAIL;
1289         }
1290
1291         /*
1292          * First write out the MAC address.
1293          */
1294
1295         mac_addr = kvp_if_name_to_mac(if_name);
1296         if (mac_addr == NULL) {
1297                 error = HV_E_FAIL;
1298                 goto setval_error;
1299         }
1300
1301         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1302         free(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         fclose(file);
1349
1350         /*
1351          * Now that we have populated the configuration file,
1352          * invoke the external script to do its magic.
1353          */
1354
1355         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1356         if (system(cmd)) {
1357                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1358                                 cmd, errno, strerror(errno));
1359                 return HV_E_FAIL;
1360         }
1361         return 0;
1362
1363 setval_error:
1364         syslog(LOG_ERR, "Failed to write config file");
1365         fclose(file);
1366         return error;
1367 }
1368
1369
1370 static void
1371 kvp_get_domain_name(char *buffer, int length)
1372 {
1373         struct addrinfo hints, *info ;
1374         int error = 0;
1375
1376         gethostname(buffer, length);
1377         memset(&hints, 0, sizeof(hints));
1378         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1379         hints.ai_socktype = SOCK_STREAM;
1380         hints.ai_flags = AI_CANONNAME;
1381
1382         error = getaddrinfo(buffer, NULL, &hints, &info);
1383         if (error != 0) {
1384                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1385                         error, gai_strerror(error));
1386                 return;
1387         }
1388         snprintf(buffer, length, "%s", info->ai_canonname);
1389         freeaddrinfo(info);
1390 }
1391
1392 static int
1393 netlink_send(int fd, struct cn_msg *msg)
1394 {
1395         struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
1396         unsigned int size;
1397         struct msghdr message;
1398         struct iovec iov[2];
1399
1400         size = sizeof(struct cn_msg) + msg->len;
1401
1402         nlh.nlmsg_pid = getpid();
1403         nlh.nlmsg_len = NLMSG_LENGTH(size);
1404
1405         iov[0].iov_base = &nlh;
1406         iov[0].iov_len = sizeof(nlh);
1407
1408         iov[1].iov_base = msg;
1409         iov[1].iov_len = size;
1410
1411         memset(&message, 0, sizeof(message));
1412         message.msg_name = &addr;
1413         message.msg_namelen = sizeof(addr);
1414         message.msg_iov = iov;
1415         message.msg_iovlen = 2;
1416
1417         return sendmsg(fd, &message, 0);
1418 }
1419
1420 int main(void)
1421 {
1422         int fd, len, nl_group;
1423         int error;
1424         struct cn_msg *message;
1425         struct pollfd pfd;
1426         struct nlmsghdr *incoming_msg;
1427         struct cn_msg   *incoming_cn_msg;
1428         struct hv_kvp_msg *hv_msg;
1429         char    *p;
1430         char    *key_value;
1431         char    *key_name;
1432         int     op;
1433         int     pool;
1434         char    *if_name;
1435         struct hv_kvp_ipaddr_value *kvp_ip_val;
1436         char *kvp_recv_buffer;
1437         size_t kvp_recv_buffer_len;
1438
1439         if (daemon(1, 0))
1440                 return 1;
1441         openlog("KVP", 0, LOG_USER);
1442         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1443
1444         kvp_recv_buffer_len = NLMSG_LENGTH(0) + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
1445         kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
1446         if (!kvp_recv_buffer) {
1447                 syslog(LOG_ERR, "Failed to allocate netlink buffer");
1448                 exit(EXIT_FAILURE);
1449         }
1450         /*
1451          * Retrieve OS release information.
1452          */
1453         kvp_get_os_info();
1454         /*
1455          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1456          * unpredictable amount of time to finish.
1457          */
1458         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1459
1460         if (kvp_file_init()) {
1461                 syslog(LOG_ERR, "Failed to initialize the pools");
1462                 exit(EXIT_FAILURE);
1463         }
1464
1465         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1466         if (fd < 0) {
1467                 syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
1468                                 strerror(errno));
1469                 exit(EXIT_FAILURE);
1470         }
1471         addr.nl_family = AF_NETLINK;
1472         addr.nl_pad = 0;
1473         addr.nl_pid = 0;
1474         addr.nl_groups = 0;
1475
1476
1477         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1478         if (error < 0) {
1479                 syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
1480                 close(fd);
1481                 exit(EXIT_FAILURE);
1482         }
1483         nl_group = CN_KVP_IDX;
1484
1485         if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
1486                 syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
1487                 close(fd);
1488                 exit(EXIT_FAILURE);
1489         }
1490
1491         /*
1492          * Register ourselves with the kernel.
1493          */
1494         message = (struct cn_msg *)kvp_recv_buffer;
1495         message->id.idx = CN_KVP_IDX;
1496         message->id.val = CN_KVP_VAL;
1497
1498         hv_msg = (struct hv_kvp_msg *)message->data;
1499         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1500         message->ack = 0;
1501         message->len = sizeof(struct hv_kvp_msg);
1502
1503         len = netlink_send(fd, message);
1504         if (len < 0) {
1505                 syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
1506                 close(fd);
1507                 exit(EXIT_FAILURE);
1508         }
1509
1510         pfd.fd = fd;
1511
1512         while (1) {
1513                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1514                 socklen_t addr_l = sizeof(addr);
1515                 pfd.events = POLLIN;
1516                 pfd.revents = 0;
1517
1518                 if (poll(&pfd, 1, -1) < 0) {
1519                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1520                         if (errno == EINVAL) {
1521                                 close(fd);
1522                                 exit(EXIT_FAILURE);
1523                         }
1524                         else
1525                                 continue;
1526                 }
1527
1528                 len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
1529                                 addr_p, &addr_l);
1530
1531                 if (len < 0) {
1532                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1533                                         addr.nl_pid, errno, strerror(errno));
1534                         close(fd);
1535                         return -1;
1536                 }
1537
1538                 if (addr.nl_pid) {
1539                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1540                                         addr.nl_pid);
1541                         continue;
1542                 }
1543
1544                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1545
1546                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1547                         continue;
1548
1549                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1550                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1551
1552                 /*
1553                  * We will use the KVP header information to pass back
1554                  * the error from this daemon. So, first copy the state
1555                  * and set the error code to success.
1556                  */
1557                 op = hv_msg->kvp_hdr.operation;
1558                 pool = hv_msg->kvp_hdr.pool;
1559                 hv_msg->error = HV_S_OK;
1560
1561                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1562                         /*
1563                          * Driver is registering with us; stash away the version
1564                          * information.
1565                          */
1566                         in_hand_shake = 0;
1567                         p = (char *)hv_msg->body.kvp_register.version;
1568                         lic_version = malloc(strlen(p) + 1);
1569                         if (lic_version) {
1570                                 strcpy(lic_version, p);
1571                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1572                                         lic_version);
1573                         } else {
1574                                 syslog(LOG_ERR, "malloc failed");
1575                         }
1576                         continue;
1577                 }
1578
1579                 switch (op) {
1580                 case KVP_OP_GET_IP_INFO:
1581                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1582                         if_name =
1583                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1584
1585                         if (if_name == NULL) {
1586                                 /*
1587                                  * We could not map the mac address to an
1588                                  * interface name; return error.
1589                                  */
1590                                 hv_msg->error = HV_E_FAIL;
1591                                 break;
1592                         }
1593                         error = kvp_get_ip_info(
1594                                                 0, if_name, KVP_OP_GET_IP_INFO,
1595                                                 kvp_ip_val,
1596                                                 (MAX_IP_ADDR_SIZE * 2));
1597
1598                         if (error)
1599                                 hv_msg->error = error;
1600
1601                         free(if_name);
1602                         break;
1603
1604                 case KVP_OP_SET_IP_INFO:
1605                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1606                         if_name = kvp_get_if_name(
1607                                         (char *)kvp_ip_val->adapter_id);
1608                         if (if_name == NULL) {
1609                                 /*
1610                                  * We could not map the guid to an
1611                                  * interface name; return error.
1612                                  */
1613                                 hv_msg->error = HV_GUID_NOTFOUND;
1614                                 break;
1615                         }
1616                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1617                         if (error)
1618                                 hv_msg->error = error;
1619
1620                         free(if_name);
1621                         break;
1622
1623                 case KVP_OP_SET:
1624                         if (kvp_key_add_or_modify(pool,
1625                                         hv_msg->body.kvp_set.data.key,
1626                                         hv_msg->body.kvp_set.data.key_size,
1627                                         hv_msg->body.kvp_set.data.value,
1628                                         hv_msg->body.kvp_set.data.value_size))
1629                                         hv_msg->error = HV_S_CONT;
1630                         break;
1631
1632                 case KVP_OP_GET:
1633                         if (kvp_get_value(pool,
1634                                         hv_msg->body.kvp_set.data.key,
1635                                         hv_msg->body.kvp_set.data.key_size,
1636                                         hv_msg->body.kvp_set.data.value,
1637                                         hv_msg->body.kvp_set.data.value_size))
1638                                         hv_msg->error = HV_S_CONT;
1639                         break;
1640
1641                 case KVP_OP_DELETE:
1642                         if (kvp_key_delete(pool,
1643                                         hv_msg->body.kvp_delete.key,
1644                                         hv_msg->body.kvp_delete.key_size))
1645                                         hv_msg->error = HV_S_CONT;
1646                         break;
1647
1648                 default:
1649                         break;
1650                 }
1651
1652                 if (op != KVP_OP_ENUMERATE)
1653                         goto kvp_done;
1654
1655                 /*
1656                  * If the pool is KVP_POOL_AUTO, dynamically generate
1657                  * both the key and the value; if not read from the
1658                  * appropriate pool.
1659                  */
1660                 if (pool != KVP_POOL_AUTO) {
1661                         if (kvp_pool_enumerate(pool,
1662                                         hv_msg->body.kvp_enum_data.index,
1663                                         hv_msg->body.kvp_enum_data.data.key,
1664                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1665                                         hv_msg->body.kvp_enum_data.data.value,
1666                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1667                                         hv_msg->error = HV_S_CONT;
1668                         goto kvp_done;
1669                 }
1670
1671                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1672                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1673                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1674
1675                 switch (hv_msg->body.kvp_enum_data.index) {
1676                 case FullyQualifiedDomainName:
1677                         strcpy(key_value, full_domain_name);
1678                         strcpy(key_name, "FullyQualifiedDomainName");
1679                         break;
1680                 case IntegrationServicesVersion:
1681                         strcpy(key_name, "IntegrationServicesVersion");
1682                         strcpy(key_value, lic_version);
1683                         break;
1684                 case NetworkAddressIPv4:
1685                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1686                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1687                         strcpy(key_name, "NetworkAddressIPv4");
1688                         break;
1689                 case NetworkAddressIPv6:
1690                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1691                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1692                         strcpy(key_name, "NetworkAddressIPv6");
1693                         break;
1694                 case OSBuildNumber:
1695                         strcpy(key_value, os_build);
1696                         strcpy(key_name, "OSBuildNumber");
1697                         break;
1698                 case OSName:
1699                         strcpy(key_value, os_name);
1700                         strcpy(key_name, "OSName");
1701                         break;
1702                 case OSMajorVersion:
1703                         strcpy(key_value, os_major);
1704                         strcpy(key_name, "OSMajorVersion");
1705                         break;
1706                 case OSMinorVersion:
1707                         strcpy(key_value, os_minor);
1708                         strcpy(key_name, "OSMinorVersion");
1709                         break;
1710                 case OSVersion:
1711                         strcpy(key_value, os_version);
1712                         strcpy(key_name, "OSVersion");
1713                         break;
1714                 case ProcessorArchitecture:
1715                         strcpy(key_value, processor_arch);
1716                         strcpy(key_name, "ProcessorArchitecture");
1717                         break;
1718                 default:
1719                         hv_msg->error = HV_S_CONT;
1720                         break;
1721                 }
1722                 /*
1723                  * Send the value back to the kernel. The response is
1724                  * already in the receive buffer. Update the cn_msg header to
1725                  * reflect the key value that has been added to the message
1726                  */
1727 kvp_done:
1728
1729                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1730                 incoming_cn_msg->id.val = CN_KVP_VAL;
1731                 incoming_cn_msg->ack = 0;
1732                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1733
1734                 len = netlink_send(fd, incoming_cn_msg);
1735                 if (len < 0) {
1736                         syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
1737                                         strerror(errno));
1738                         exit(EXIT_FAILURE);
1739                 }
1740         }
1741
1742 }