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/hyperv.h>
  37 #include <linux/netlink.h>
  38 #include <ifaddrs.h>
  39 #include <netdb.h>
  40 #include <syslog.h>
  41 #include <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <dirent.h>
  44 #include <net/if.h>
  45 #include <getopt.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 int in_hand_shake = 1;
  82
  83 static char *os_name = "";
  84 static char *os_major = "";
  85 static char *os_minor = "";
  86 static char *processor_arch;
  87 static char *os_build;
  88 static char *os_version;
  89 static char *lic_version = "Unknown version";
  90 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  91 static struct utsname uts_buf;
  92
  93 /*
  94  * The location of the interface configuration file.
  95  */
  96
  97 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
  98
  99 #define MAX_FILE_NAME 100
 100 #define ENTRIES_PER_BLOCK 50
 101
 102 #ifndef SOL_NETLINK
 103 #define SOL_NETLINK 270
 104 #endif
 105
 106 struct kvp_record {
 107         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 108         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 109 };
 110
 111 struct kvp_file_state {
 112         int fd;
 113         int num_blocks;
 114         struct kvp_record *records;
 115         int num_records;
 116         char fname[MAX_FILE_NAME];
 117 };
 118
 119 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 120
 121 static void kvp_acquire_lock(int pool)
 122 {
 123         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 124         fl.l_pid = getpid();
 125
 126         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 127                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 128                                 errno, strerror(errno));
 129                 exit(EXIT_FAILURE);
 130         }
 131 }
 132
 133 static void kvp_release_lock(int pool)
 134 {
 135         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 136         fl.l_pid = getpid();
 137
 138         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 139                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 140                                 errno, strerror(errno));
 141                 exit(EXIT_FAILURE);
 142         }
 143 }
 144
 145 static void kvp_update_file(int pool)
 146 {
 147         FILE *filep;
 148
 149         /*
 150          * We are going to write our in-memory registry out to
 151          * disk; acquire the lock first.
 152          */
 153         kvp_acquire_lock(pool);
 154
 155         filep = fopen(kvp_file_info[pool].fname, "we");
 156         if (!filep) {
 157                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 158                                 errno, strerror(errno));
 159                 kvp_release_lock(pool);
 160                 exit(EXIT_FAILURE);
 161         }
 162
 163         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
 164                                 kvp_file_info[pool].num_records, filep);
 165
 166         if (ferror(filep) || fclose(filep)) {
 167                 kvp_release_lock(pool);
 168                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 169                 exit(EXIT_FAILURE);
 170         }
 171
 172         kvp_release_lock(pool);
 173 }
 174
 175 static void kvp_update_mem_state(int pool)
 176 {
 177         FILE *filep;
 178         size_t records_read = 0;
 179         struct kvp_record *record = kvp_file_info[pool].records;
 180         struct kvp_record *readp;
 181         int num_blocks = kvp_file_info[pool].num_blocks;
 182         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 183
 184         kvp_acquire_lock(pool);
 185
 186         filep = fopen(kvp_file_info[pool].fname, "re");
 187         if (!filep) {
 188                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 189                                 errno, strerror(errno));
 190                 kvp_release_lock(pool);
 191                 exit(EXIT_FAILURE);
 192         }
 193         for (;;) {
 194                 readp = &record[records_read];
 195                 records_read += fread(readp, sizeof(struct kvp_record),
 196                                 ENTRIES_PER_BLOCK * num_blocks - records_read,
 197                                 filep);
 198
 199                 if (ferror(filep)) {
 200                         syslog(LOG_ERR,
 201                                 "Failed to read file, pool: %d; error: %d %s",
 202                                  pool, errno, strerror(errno));
 203                         kvp_release_lock(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                                 kvp_release_lock(pool);
 217                                 exit(EXIT_FAILURE);
 218                         }
 219                         continue;
 220                 }
 221                 break;
 222         }
 223
 224         kvp_file_info[pool].num_blocks = num_blocks;
 225         kvp_file_info[pool].records = record;
 226         kvp_file_info[pool].num_records = records_read;
 227
 228         fclose(filep);
 229         kvp_release_lock(pool);
 230 }
 231
 232 static int kvp_file_init(void)
 233 {
 234         int  fd;
 235         char *fname;
 236         int i;
 237         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 238
 239         if (access(KVP_CONFIG_LOC, F_OK)) {
 240                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 241                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
 242                                         errno, strerror(errno));
 243                         exit(EXIT_FAILURE);
 244                 }
 245         }
 246
 247         for (i = 0; i < KVP_POOL_COUNT; i++) {
 248                 fname = kvp_file_info[i].fname;
 249                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 250                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 251
 252                 if (fd == -1)
 253                         return 1;
 254
 255                 kvp_file_info[i].fd = fd;
 256                 kvp_file_info[i].num_blocks = 1;
 257                 kvp_file_info[i].records = malloc(alloc_unit);
 258                 if (kvp_file_info[i].records == NULL)
 259                         return 1;
 260                 kvp_file_info[i].num_records = 0;
 261                 kvp_update_mem_state(i);
 262         }
 263
 264         return 0;
 265 }
 266
 267 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
 268 {
 269         int i;
 270         int j, k;
 271         int num_records;
 272         struct kvp_record *record;
 273
 274         /*
 275          * First update the in-memory state.
 276          */
 277         kvp_update_mem_state(pool);
 278
 279         num_records = kvp_file_info[pool].num_records;
 280         record = kvp_file_info[pool].records;
 281
 282         for (i = 0; i < num_records; i++) {
 283                 if (memcmp(key, record[i].key, key_size))
 284                         continue;
 285                 /*
 286                  * Found a match; just move the remaining
 287                  * entries up.
 288                  */
 289                 if (i == (num_records - 1)) {
 290                         kvp_file_info[pool].num_records--;
 291                         kvp_update_file(pool);
 292                         return 0;
 293                 }
 294
 295                 j = i;
 296                 k = j + 1;
 297                 for (; k < num_records; k++) {
 298                         strcpy(record[j].key, record[k].key);
 299                         strcpy(record[j].value, record[k].value);
 300                         j++;
 301                 }
 302
 303                 kvp_file_info[pool].num_records--;
 304                 kvp_update_file(pool);
 305                 return 0;
 306         }
 307         return 1;
 308 }
 309
 310 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
 311                                  const __u8 *value, int value_size)
 312 {
 313         int i;
 314         int num_records;
 315         struct kvp_record *record;
 316         int num_blocks;
 317
 318         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 319                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 320                 return 1;
 321
 322         /*
 323          * First update the in-memory state.
 324          */
 325         kvp_update_mem_state(pool);
 326
 327         num_records = kvp_file_info[pool].num_records;
 328         record = kvp_file_info[pool].records;
 329         num_blocks = kvp_file_info[pool].num_blocks;
 330
 331         for (i = 0; i < num_records; i++) {
 332                 if (memcmp(key, record[i].key, key_size))
 333                         continue;
 334                 /*
 335                  * Found a match; just update the value -
 336                  * this is the modify case.
 337                  */
 338                 memcpy(record[i].value, value, value_size);
 339                 kvp_update_file(pool);
 340                 return 0;
 341         }
 342
 343         /*
 344          * Need to add a new entry;
 345          */
 346         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 347                 /* Need to allocate a larger array for reg entries. */
 348                 record = realloc(record, sizeof(struct kvp_record) *
 349                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 350
 351                 if (record == NULL)
 352                         return 1;
 353                 kvp_file_info[pool].num_blocks++;
 354
 355         }
 356         memcpy(record[i].value, value, value_size);
 357         memcpy(record[i].key, key, key_size);
 358         kvp_file_info[pool].records = record;
 359         kvp_file_info[pool].num_records++;
 360         kvp_update_file(pool);
 361         return 0;
 362 }
 363
 364 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
 365                         int value_size)
 366 {
 367         int i;
 368         int num_records;
 369         struct kvp_record *record;
 370
 371         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 372                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 373                 return 1;
 374
 375         /*
 376          * First update the in-memory state.
 377          */
 378         kvp_update_mem_state(pool);
 379
 380         num_records = kvp_file_info[pool].num_records;
 381         record = kvp_file_info[pool].records;
 382
 383         for (i = 0; i < num_records; i++) {
 384                 if (memcmp(key, record[i].key, key_size))
 385                         continue;
 386                 /*
 387                  * Found a match; just copy the value out.
 388                  */
 389                 memcpy(value, record[i].value, value_size);
 390                 return 0;
 391         }
 392
 393         return 1;
 394 }
 395
 396 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
 397                                 __u8 *value, int value_size)
 398 {
 399         struct kvp_record *record;
 400
 401         /*
 402          * First update our in-memory database.
 403          */
 404         kvp_update_mem_state(pool);
 405         record = kvp_file_info[pool].records;
 406
 407         if (index >= kvp_file_info[pool].num_records) {
 408                 return 1;
 409         }
 410
 411         memcpy(key, record[index].key, key_size);
 412         memcpy(value, record[index].value, value_size);
 413         return 0;
 414 }
 415
 416
 417 void kvp_get_os_info(void)
 418 {
 419         FILE    *file;
 420         char    *p, buf[512];
 421
 422         uname(&uts_buf);
 423         os_version = uts_buf.release;
 424         os_build = strdup(uts_buf.release);
 425
 426         os_name = uts_buf.sysname;
 427         processor_arch = uts_buf.machine;
 428
 429         /*
 430          * The current windows host (win7) expects the build
 431          * string to be of the form: x.y.z
 432          * Strip additional information we may have.
 433          */
 434         p = strchr(os_version, '-');
 435         if (p)
 436                 *p = '\0';
 437
 438         /*
 439          * Parse the /etc/os-release file if present:
 440          * http://www.freedesktop.org/software/systemd/man/os-release.html
 441          */
 442         file = fopen("/etc/os-release", "r");
 443         if (file != NULL) {
 444                 while (fgets(buf, sizeof(buf), file)) {
 445                         char *value, *q;
 446
 447                         /* Ignore comments */
 448                         if (buf[0] == '#')
 449                                 continue;
 450
 451                         /* Split into name=value */
 452                         p = strchr(buf, '=');
 453                         if (!p)
 454                                 continue;
 455                         *p++ = 0;
 456
 457                         /* Remove quotes and newline; un-escape */
 458                         value = p;
 459                         q = p;
 460                         while (*p) {
 461                                 if (*p == '\\') {
 462                                         ++p;
 463                                         if (!*p)
 464                                                 break;
 465                                         *q++ = *p++;
 466                                 } else if (*p == '\'' || *p == '"' ||
 467                                            *p == '\n') {
 468                                         ++p;
 469                                 } else {
 470                                         *q++ = *p++;
 471                                 }
 472                         }
 473                         *q = 0;
 474
 475                         if (!strcmp(buf, "NAME")) {
 476                                 p = strdup(value);
 477                                 if (!p)
 478                                         break;
 479                                 os_name = p;
 480                         } else if (!strcmp(buf, "VERSION_ID")) {
 481                                 p = strdup(value);
 482                                 if (!p)
 483                                         break;
 484                                 os_major = p;
 485                         }
 486                 }
 487                 fclose(file);
 488                 return;
 489         }
 490
 491         /* Fallback for older RH/SUSE releases */
 492         file = fopen("/etc/SuSE-release", "r");
 493         if (file != NULL)
 494                 goto kvp_osinfo_found;
 495         file  = fopen("/etc/redhat-release", "r");
 496         if (file != NULL)
 497                 goto kvp_osinfo_found;
 498
 499         /*
 500          * We don't have information about the os.
 501          */
 502         return;
 503
 504 kvp_osinfo_found:
 505         /* up to three lines */
 506         p = fgets(buf, sizeof(buf), file);
 507         if (p) {
 508                 p = strchr(buf, '\n');
 509                 if (p)
 510                         *p = '\0';
 511                 p = strdup(buf);
 512                 if (!p)
 513                         goto done;
 514                 os_name = p;
 515
 516                 /* second line */
 517                 p = fgets(buf, sizeof(buf), file);
 518                 if (p) {
 519                         p = strchr(buf, '\n');
 520                         if (p)
 521                                 *p = '\0';
 522                         p = strdup(buf);
 523                         if (!p)
 524                                 goto done;
 525                         os_major = p;
 526
 527                         /* third line */
 528                         p = fgets(buf, sizeof(buf), file);
 529                         if (p)  {
 530                                 p = strchr(buf, '\n');
 531                                 if (p)
 532                                         *p = '\0';
 533                                 p = strdup(buf);
 534                                 if (p)
 535                                         os_minor = p;
 536                         }
 537                 }
 538         }
 539
 540 done:
 541         fclose(file);
 542         return;
 543 }
 544
 545
 546
 547 /*
 548  * Retrieve an interface name corresponding to the specified guid.
 549  * If there is a match, the function returns a pointer
 550  * to the interface name and if not, a NULL is returned.
 551  * If a match is found, the caller is responsible for
 552  * freeing the memory.
 553  */
 554
 555 static char *kvp_get_if_name(char *guid)
 556 {
 557         DIR *dir;
 558         struct dirent *entry;
 559         FILE    *file;
 560         char    *p, *q, *x;
 561         char    *if_name = NULL;
 562         char    buf[256];
 563         char *kvp_net_dir = "/sys/class/net/";
 564         char dev_id[256];
 565
 566         dir = opendir(kvp_net_dir);
 567         if (dir == NULL)
 568                 return NULL;
 569
 570         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 571         q = dev_id + strlen(kvp_net_dir);
 572
 573         while ((entry = readdir(dir)) != NULL) {
 574                 /*
 575                  * Set the state for the next pass.
 576                  */
 577                 *q = '\0';
 578                 strcat(dev_id, entry->d_name);
 579                 strcat(dev_id, "/device/device_id");
 580
 581                 file = fopen(dev_id, "r");
 582                 if (file == NULL)
 583                         continue;
 584
 585                 p = fgets(buf, sizeof(buf), file);
 586                 if (p) {
 587                         x = strchr(p, '\n');
 588                         if (x)
 589                                 *x = '\0';
 590
 591                         if (!strcmp(p, guid)) {
 592                                 /*
 593                                  * Found the guid match; return the interface
 594                                  * name. The caller will free the memory.
 595                                  */
 596                                 if_name = strdup(entry->d_name);
 597                                 fclose(file);
 598                                 break;
 599                         }
 600                 }
 601                 fclose(file);
 602         }
 603
 604         closedir(dir);
 605         return if_name;
 606 }
 607
 608 /*
 609  * Retrieve the MAC address given the interface name.
 610  */
 611
 612 static char *kvp_if_name_to_mac(char *if_name)
 613 {
 614         FILE    *file;
 615         char    *p, *x;
 616         char    buf[256];
 617         char addr_file[256];
 618         unsigned int i;
 619         char *mac_addr = NULL;
 620
 621         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 622                 if_name, "/address");
 623
 624         file = fopen(addr_file, "r");
 625         if (file == NULL)
 626                 return NULL;
 627
 628         p = fgets(buf, sizeof(buf), file);
 629         if (p) {
 630                 x = strchr(p, '\n');
 631                 if (x)
 632                         *x = '\0';
 633                 for (i = 0; i < strlen(p); i++)
 634                         p[i] = toupper(p[i]);
 635                 mac_addr = strdup(p);
 636         }
 637
 638         fclose(file);
 639         return mac_addr;
 640 }
 641
 642
 643 /*
 644  * Retrieve the interface name given tha MAC address.
 645  */
 646
 647 static char *kvp_mac_to_if_name(char *mac)
 648 {
 649         DIR *dir;
 650         struct dirent *entry;
 651         FILE    *file;
 652         char    *p, *q, *x;
 653         char    *if_name = NULL;
 654         char    buf[256];
 655         char *kvp_net_dir = "/sys/class/net/";
 656         char dev_id[256];
 657         unsigned int i;
 658
 659         dir = opendir(kvp_net_dir);
 660         if (dir == NULL)
 661                 return NULL;
 662
 663         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 664         q = dev_id + strlen(kvp_net_dir);
 665
 666         while ((entry = readdir(dir)) != NULL) {
 667                 /*
 668                  * Set the state for the next pass.
 669                  */
 670                 *q = '\0';
 671
 672                 strcat(dev_id, entry->d_name);
 673                 strcat(dev_id, "/address");
 674
 675                 file = fopen(dev_id, "r");
 676                 if (file == NULL)
 677                         continue;
 678
 679                 p = fgets(buf, sizeof(buf), file);
 680                 if (p) {
 681                         x = strchr(p, '\n');
 682                         if (x)
 683                                 *x = '\0';
 684
 685                         for (i = 0; i < strlen(p); i++)
 686                                 p[i] = toupper(p[i]);
 687
 688                         if (!strcmp(p, mac)) {
 689                                 /*
 690                                  * Found the MAC match; return the interface
 691                                  * name. The caller will free the memory.
 692                                  */
 693                                 if_name = strdup(entry->d_name);
 694                                 fclose(file);
 695                                 break;
 696                         }
 697                 }
 698                 fclose(file);
 699         }
 700
 701         closedir(dir);
 702         return if_name;
 703 }
 704
 705
 706 static void kvp_process_ipconfig_file(char *cmd,
 707                                         char *config_buf, unsigned int len,
 708                                         int element_size, int offset)
 709 {
 710         char buf[256];
 711         char *p;
 712         char *x;
 713         FILE *file;
 714
 715         /*
 716          * First execute the command.
 717          */
 718         file = popen(cmd, "r");
 719         if (file == NULL)
 720                 return;
 721
 722         if (offset == 0)
 723                 memset(config_buf, 0, len);
 724         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 725                 if (len < strlen(config_buf) + element_size + 1)
 726                         break;
 727
 728                 x = strchr(p, '\n');
 729                 if (x)
 730                         *x = '\0';
 731
 732                 strcat(config_buf, p);
 733                 strcat(config_buf, ";");
 734         }
 735         pclose(file);
 736 }
 737
 738 static void kvp_get_ipconfig_info(char *if_name,
 739                                  struct hv_kvp_ipaddr_value *buffer)
 740 {
 741         char cmd[512];
 742         char dhcp_info[128];
 743         char *p;
 744         FILE *file;
 745
 746         /*
 747          * Get the address of default gateway (ipv4).
 748          */
 749         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 750         strcat(cmd, " | awk '/default/ {print $3 }'");
 751
 752         /*
 753          * Execute the command to gather gateway info.
 754          */
 755         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 756                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 757
 758         /*
 759          * Get the address of default gateway (ipv6).
 760          */
 761         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 762         strcat(cmd, " | awk '/default/ {print $3 }'");
 763
 764         /*
 765          * Execute the command to gather gateway info (ipv6).
 766          */
 767         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 768                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 769
 770
 771         /*
 772          * Gather the DNS  state.
 773          * Since there is no standard way to get this information
 774          * across various distributions of interest; we just invoke
 775          * an external script that needs to be ported across distros
 776          * of interest.
 777          *
 778          * Following is the expected format of the information from the script:
 779          *
 780          * ipaddr1 (nameserver1)
 781          * ipaddr2 (nameserver2)
 782          * .
 783          * .
 784          */
 785
 786         sprintf(cmd, "%s",  "hv_get_dns_info");
 787
 788         /*
 789          * Execute the command to gather DNS info.
 790          */
 791         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 792                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 793
 794         /*
 795          * Gather the DHCP state.
 796          * We will gather this state by invoking an external script.
 797          * The parameter to the script is the interface name.
 798          * Here is the expected output:
 799          *
 800          * Enabled: DHCP enabled.
 801          */
 802
 803         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 804
 805         file = popen(cmd, "r");
 806         if (file == NULL)
 807                 return;
 808
 809         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 810         if (p == NULL) {
 811                 pclose(file);
 812                 return;
 813         }
 814
 815         if (!strncmp(p, "Enabled", 7))
 816                 buffer->dhcp_enabled = 1;
 817         else
 818                 buffer->dhcp_enabled = 0;
 819
 820         pclose(file);
 821 }
 822
 823
 824 static unsigned int hweight32(unsigned int *w)
 825 {
 826         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 827         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 828         res = (res + (res >> 4)) & 0x0F0F0F0F;
 829         res = res + (res >> 8);
 830         return (res + (res >> 16)) & 0x000000FF;
 831 }
 832
 833 static int kvp_process_ip_address(void *addrp,
 834                                 int family, char *buffer,
 835                                 int length,  int *offset)
 836 {
 837         struct sockaddr_in *addr;
 838         struct sockaddr_in6 *addr6;
 839         int addr_length;
 840         char tmp[50];
 841         const char *str;
 842
 843         if (family == AF_INET) {
 844                 addr = (struct sockaddr_in *)addrp;
 845                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 846                 addr_length = INET_ADDRSTRLEN;
 847         } else {
 848                 addr6 = (struct sockaddr_in6 *)addrp;
 849                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 850                 addr_length = INET6_ADDRSTRLEN;
 851         }
 852
 853         if ((length - *offset) < addr_length + 2)
 854                 return HV_E_FAIL;
 855         if (str == NULL) {
 856                 strcpy(buffer, "inet_ntop failed\n");
 857                 return HV_E_FAIL;
 858         }
 859         if (*offset == 0)
 860                 strcpy(buffer, tmp);
 861         else {
 862                 strcat(buffer, ";");
 863                 strcat(buffer, tmp);
 864         }
 865
 866         *offset += strlen(str) + 1;
 867
 868         return 0;
 869 }
 870
 871 static int
 872 kvp_get_ip_info(int family, char *if_name, int op,
 873                  void  *out_buffer, unsigned int length)
 874 {
 875         struct ifaddrs *ifap;
 876         struct ifaddrs *curp;
 877         int offset = 0;
 878         int sn_offset = 0;
 879         int error = 0;
 880         char *buffer;
 881         struct hv_kvp_ipaddr_value *ip_buffer;
 882         char cidr_mask[5]; /* /xyz */
 883         int weight;
 884         int i;
 885         unsigned int *w;
 886         char *sn_str;
 887         struct sockaddr_in6 *addr6;
 888
 889         if (op == KVP_OP_ENUMERATE) {
 890                 buffer = out_buffer;
 891         } else {
 892                 ip_buffer = out_buffer;
 893                 buffer = (char *)ip_buffer->ip_addr;
 894                 ip_buffer->addr_family = 0;
 895         }
 896         /*
 897          * On entry into this function, the buffer is capable of holding the
 898          * maximum key value.
 899          */
 900
 901         if (getifaddrs(&ifap)) {
 902                 strcpy(buffer, "getifaddrs failed\n");
 903                 return HV_E_FAIL;
 904         }
 905
 906         curp = ifap;
 907         while (curp != NULL) {
 908                 if (curp->ifa_addr == NULL) {
 909                         curp = curp->ifa_next;
 910                         continue;
 911                 }
 912
 913                 if ((if_name != NULL) &&
 914                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 915                         /*
 916                          * We want info about a specific interface;
 917                          * just continue.
 918                          */
 919                         curp = curp->ifa_next;
 920                         continue;
 921                 }
 922
 923                 /*
 924                  * We only support two address families: AF_INET and AF_INET6.
 925                  * If a family value of 0 is specified, we collect both
 926                  * supported address families; if not we gather info on
 927                  * the specified address family.
 928                  */
 929                 if ((((family != 0) &&
 930                          (curp->ifa_addr->sa_family != family))) ||
 931                          (curp->ifa_flags & IFF_LOOPBACK)) {
 932                         curp = curp->ifa_next;
 933                         continue;
 934                 }
 935                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 936                         (curp->ifa_addr->sa_family != AF_INET6)) {
 937                         curp = curp->ifa_next;
 938                         continue;
 939                 }
 940
 941                 if (op == KVP_OP_GET_IP_INFO) {
 942                         /*
 943                          * Gather info other than the IP address.
 944                          * IP address info will be gathered later.
 945                          */
 946                         if (curp->ifa_addr->sa_family == AF_INET) {
 947                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 948                                 /*
 949                                  * Get subnet info.
 950                                  */
 951                                 error = kvp_process_ip_address(
 952                                                              curp->ifa_netmask,
 953                                                              AF_INET,
 954                                                              (char *)
 955                                                              ip_buffer->sub_net,
 956                                                              length,
 957                                                              &sn_offset);
 958                                 if (error)
 959                                         goto gather_ipaddr;
 960                         } else {
 961                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 962
 963                                 /*
 964                                  * Get subnet info in CIDR format.
 965                                  */
 966                                 weight = 0;
 967                                 sn_str = (char *)ip_buffer->sub_net;
 968                                 addr6 = (struct sockaddr_in6 *)
 969                                         curp->ifa_netmask;
 970                                 w = addr6->sin6_addr.s6_addr32;
 971
 972                                 for (i = 0; i < 4; i++)
 973                                         weight += hweight32(&w[i]);
 974
 975                                 sprintf(cidr_mask, "/%d", weight);
 976                                 if (length < sn_offset + strlen(cidr_mask) + 1)
 977                                         goto gather_ipaddr;
 978
 979                                 if (sn_offset == 0)
 980                                         strcpy(sn_str, cidr_mask);
 981                                 else {
 982                                         strcat((char *)ip_buffer->sub_net, ";");
 983                                         strcat(sn_str, cidr_mask);
 984                                 }
 985                                 sn_offset += strlen(sn_str) + 1;
 986                         }
 987
 988                         /*
 989                          * Collect other ip related configuration info.
 990                          */
 991
 992                         kvp_get_ipconfig_info(if_name, ip_buffer);
 993                 }
 994
 995 gather_ipaddr:
 996                 error = kvp_process_ip_address(curp->ifa_addr,
 997                                                 curp->ifa_addr->sa_family,
 998                                                 buffer,
 999                                                 length, &offset);
1000                 if (error)
1001                         goto getaddr_done;
1002
1003                 curp = curp->ifa_next;
1004         }
1005
1006 getaddr_done:
1007         freeifaddrs(ifap);
1008         return error;
1009 }
1010
1011
1012 static int expand_ipv6(char *addr, int type)
1013 {
1014         int ret;
1015         struct in6_addr v6_addr;
1016
1017         ret = inet_pton(AF_INET6, addr, &v6_addr);
1018
1019         if (ret != 1) {
1020                 if (type == NETMASK)
1021                         return 1;
1022                 return 0;
1023         }
1024
1025         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1026                 "%02x%02x:%02x%02x:%02x%02x",
1027                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1028                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1029                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1030                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1031                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1032                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1033                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1034                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1035
1036         return 1;
1037
1038 }
1039
1040 static int is_ipv4(char *addr)
1041 {
1042         int ret;
1043         struct in_addr ipv4_addr;
1044
1045         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1046
1047         if (ret == 1)
1048                 return 1;
1049         return 0;
1050 }
1051
1052 static int parse_ip_val_buffer(char *in_buf, int *offset,
1053                                 char *out_buf, int out_len)
1054 {
1055         char *x;
1056         char *start;
1057
1058         /*
1059          * in_buf has sequence of characters that are seperated by
1060          * the character ';'. The last sequence does not have the
1061          * terminating ";" character.
1062          */
1063         start = in_buf + *offset;
1064
1065         x = strchr(start, ';');
1066         if (x)
1067                 *x = 0;
1068         else
1069                 x = start + strlen(start);
1070
1071         if (strlen(start) != 0) {
1072                 int i = 0;
1073                 /*
1074                  * Get rid of leading spaces.
1075                  */
1076                 while (start[i] == ' ')
1077                         i++;
1078
1079                 if ((x - start) <= out_len) {
1080                         strcpy(out_buf, (start + i));
1081                         *offset += (x - start) + 1;
1082                         return 1;
1083                 }
1084         }
1085         return 0;
1086 }
1087
1088 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1089 {
1090         int ret;
1091
1092         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1093
1094         if (ret < 0)
1095                 return HV_E_FAIL;
1096
1097         return 0;
1098 }
1099
1100
1101 static int process_ip_string(FILE *f, char *ip_string, int type)
1102 {
1103         int error = 0;
1104         char addr[INET6_ADDRSTRLEN];
1105         int i = 0;
1106         int j = 0;
1107         char str[256];
1108         char sub_str[10];
1109         int offset = 0;
1110
1111         memset(addr, 0, sizeof(addr));
1112
1113         while (parse_ip_val_buffer(ip_string, &offset, addr,
1114                                         (MAX_IP_ADDR_SIZE * 2))) {
1115
1116                 sub_str[0] = 0;
1117                 if (is_ipv4(addr)) {
1118                         switch (type) {
1119                         case IPADDR:
1120                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1121                                 break;
1122                         case NETMASK:
1123                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1124                                 break;
1125                         case GATEWAY:
1126                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1127                                 break;
1128                         case DNS:
1129                                 snprintf(str, sizeof(str), "%s", "DNS");
1130                                 break;
1131                         }
1132
1133                         if (type == DNS) {
1134                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1135                         } else if (type == GATEWAY && i == 0) {
1136                                 ++i;
1137                         } else {
1138                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1139                         }
1140
1141
1142                 } else if (expand_ipv6(addr, type)) {
1143                         switch (type) {
1144                         case IPADDR:
1145                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1146                                 break;
1147                         case NETMASK:
1148                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1149                                 break;
1150                         case GATEWAY:
1151                                 snprintf(str, sizeof(str), "%s",
1152                                         "IPV6_DEFAULTGW");
1153                                 break;
1154                         case DNS:
1155                                 snprintf(str, sizeof(str), "%s",  "DNS");
1156                                 break;
1157                         }
1158
1159                         if (type == DNS) {
1160                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1161                         } else if (j == 0) {
1162                                 ++j;
1163                         } else {
1164                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1165                         }
1166                 } else {
1167                         return  HV_INVALIDARG;
1168                 }
1169
1170                 error = kvp_write_file(f, str, sub_str, addr);
1171                 if (error)
1172                         return error;
1173                 memset(addr, 0, sizeof(addr));
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1180 {
1181         int error = 0;
1182         char if_file[128];
1183         FILE *file;
1184         char cmd[512];
1185         char *mac_addr;
1186
1187         /*
1188          * Set the configuration for the specified interface with
1189          * the information provided. Since there is no standard
1190          * way to configure an interface, we will have an external
1191          * script that does the job of configuring the interface and
1192          * flushing the configuration.
1193          *
1194          * The parameters passed to this external script are:
1195          * 1. A configuration file that has the specified configuration.
1196          *
1197          * We will embed the name of the interface in the configuration
1198          * file: ifcfg-ethx (where ethx is the interface name).
1199          *
1200          * The information provided here may be more than what is needed
1201          * in a given distro to configure the interface and so are free
1202          * ignore information that may not be relevant.
1203          *
1204          * Here is the format of the ip configuration file:
1205          *
1206          * HWADDR=macaddr
1207          * DEVICE=interface name
1208          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1209          *                       or "none" if no boot-time protocol should be used)
1210          *
1211          * IPADDR0=ipaddr1
1212          * IPADDR1=ipaddr2
1213          * IPADDRx=ipaddry (where y = x + 1)
1214          *
1215          * NETMASK0=netmask1
1216          * NETMASKx=netmasky (where y = x + 1)
1217          *
1218          * GATEWAY=ipaddr1
1219          * GATEWAYx=ipaddry (where y = x + 1)
1220          *
1221          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1222          *
1223          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1224          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1225          * IPV6NETMASK.
1226          *
1227          * The host can specify multiple ipv4 and ipv6 addresses to be
1228          * configured for the interface. Furthermore, the configuration
1229          * needs to be persistent. A subsequent GET call on the interface
1230          * is expected to return the configuration that is set via the SET
1231          * call.
1232          */
1233
1234         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1235                 "/ifcfg-", if_name);
1236
1237         file = fopen(if_file, "w");
1238
1239         if (file == NULL) {
1240                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1241                                 errno, strerror(errno));
1242                 return HV_E_FAIL;
1243         }
1244
1245         /*
1246          * First write out the MAC address.
1247          */
1248
1249         mac_addr = kvp_if_name_to_mac(if_name);
1250         if (mac_addr == NULL) {
1251                 error = HV_E_FAIL;
1252                 goto setval_error;
1253         }
1254
1255         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1256         free(mac_addr);
1257         if (error)
1258                 goto setval_error;
1259
1260         error = kvp_write_file(file, "DEVICE", "", if_name);
1261         if (error)
1262                 goto setval_error;
1263
1264         /*
1265          * The dhcp_enabled flag is only for IPv4. In the case the host only
1266          * injects an IPv6 address, the flag is true, but we still need to
1267          * proceed to parse and pass the IPv6 information to the
1268          * disto-specific script hv_set_ifconfig.
1269          */
1270         if (new_val->dhcp_enabled) {
1271                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1272                 if (error)
1273                         goto setval_error;
1274
1275         } else {
1276                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1277                 if (error)
1278                         goto setval_error;
1279         }
1280
1281         /*
1282          * Write the configuration for ipaddress, netmask, gateway and
1283          * name servers.
1284          */
1285
1286         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1287         if (error)
1288                 goto setval_error;
1289
1290         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1291         if (error)
1292                 goto setval_error;
1293
1294         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1295         if (error)
1296                 goto setval_error;
1297
1298         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1299         if (error)
1300                 goto setval_error;
1301
1302         fclose(file);
1303
1304         /*
1305          * Now that we have populated the configuration file,
1306          * invoke the external script to do its magic.
1307          */
1308
1309         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1310         if (system(cmd)) {
1311                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1312                                 cmd, errno, strerror(errno));
1313                 return HV_E_FAIL;
1314         }
1315         return 0;
1316
1317 setval_error:
1318         syslog(LOG_ERR, "Failed to write config file");
1319         fclose(file);
1320         return error;
1321 }
1322
1323
1324 static void
1325 kvp_get_domain_name(char *buffer, int length)
1326 {
1327         struct addrinfo hints, *info ;
1328         int error = 0;
1329
1330         gethostname(buffer, length);
1331         memset(&hints, 0, sizeof(hints));
1332         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1333         hints.ai_socktype = SOCK_STREAM;
1334         hints.ai_flags = AI_CANONNAME;
1335
1336         error = getaddrinfo(buffer, NULL, &hints, &info);
1337         if (error != 0) {
1338                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1339                         error, gai_strerror(error));
1340                 return;
1341         }
1342         snprintf(buffer, length, "%s", info->ai_canonname);
1343         freeaddrinfo(info);
1344 }
1345
1346 void print_usage(char *argv[])
1347 {
1348         fprintf(stderr, "Usage: %s [options]\n"
1349                 "Options are:\n"
1350                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1351                 "  -h, --help             print this help\n", argv[0]);
1352 }
1353
1354 int main(int argc, char *argv[])
1355 {
1356         int kvp_fd, len;
1357         int error;
1358         struct pollfd pfd;
1359         char    *p;
1360         struct hv_kvp_msg hv_msg[1];
1361         char    *key_value;
1362         char    *key_name;
1363         int     op;
1364         int     pool;
1365         char    *if_name;
1366         struct hv_kvp_ipaddr_value *kvp_ip_val;
1367         int daemonize = 1, long_index = 0, opt;
1368
1369         static struct option long_options[] = {
1370                 {"help",        no_argument,       0,  'h' },
1371                 {"no-daemon",   no_argument,       0,  'n' },
1372                 {0,             0,                 0,  0   }
1373         };
1374
1375         while ((opt = getopt_long(argc, argv, "hn", long_options,
1376                                   &long_index)) != -1) {
1377                 switch (opt) {
1378                 case 'n':
1379                         daemonize = 0;
1380                         break;
1381                 case 'h':
1382                 default:
1383                         print_usage(argv);
1384                         exit(EXIT_FAILURE);
1385                 }
1386         }
1387
1388         if (daemonize && daemon(1, 0))
1389                 return 1;
1390
1391         openlog("KVP", 0, LOG_USER);
1392         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1393
1394         kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
1395
1396         if (kvp_fd < 0) {
1397                 syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1398                         errno, strerror(errno));
1399                 exit(EXIT_FAILURE);
1400         }
1401
1402         /*
1403          * Retrieve OS release information.
1404          */
1405         kvp_get_os_info();
1406         /*
1407          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1408          * unpredictable amount of time to finish.
1409          */
1410         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1411
1412         if (kvp_file_init()) {
1413                 syslog(LOG_ERR, "Failed to initialize the pools");
1414                 exit(EXIT_FAILURE);
1415         }
1416
1417         /*
1418          * Register ourselves with the kernel.
1419          */
1420         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1421         len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1422         if (len != sizeof(struct hv_kvp_msg)) {
1423                 syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1424                        errno, strerror(errno));
1425                 close(kvp_fd);
1426                 exit(EXIT_FAILURE);
1427         }
1428
1429         pfd.fd = kvp_fd;
1430
1431         while (1) {
1432                 pfd.events = POLLIN;
1433                 pfd.revents = 0;
1434
1435                 if (poll(&pfd, 1, -1) < 0) {
1436                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1437                         if (errno == EINVAL) {
1438                                 close(kvp_fd);
1439                                 exit(EXIT_FAILURE);
1440                         }
1441                         else
1442                                 continue;
1443                 }
1444
1445                 len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1446
1447                 if (len != sizeof(struct hv_kvp_msg)) {
1448                         syslog(LOG_ERR, "read failed; error:%d %s",
1449                                errno, strerror(errno));
1450
1451                         close(kvp_fd);
1452                         return EXIT_FAILURE;
1453                 }
1454
1455                 /*
1456                  * We will use the KVP header information to pass back
1457                  * the error from this daemon. So, first copy the state
1458                  * and set the error code to success.
1459                  */
1460                 op = hv_msg->kvp_hdr.operation;
1461                 pool = hv_msg->kvp_hdr.pool;
1462                 hv_msg->error = HV_S_OK;
1463
1464                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1465                         /*
1466                          * Driver is registering with us; stash away the version
1467                          * information.
1468                          */
1469                         in_hand_shake = 0;
1470                         p = (char *)hv_msg->body.kvp_register.version;
1471                         lic_version = malloc(strlen(p) + 1);
1472                         if (lic_version) {
1473                                 strcpy(lic_version, p);
1474                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1475                                        lic_version);
1476                         } else {
1477                                 syslog(LOG_ERR, "malloc failed");
1478                         }
1479                         continue;
1480                 }
1481
1482                 switch (op) {
1483                 case KVP_OP_GET_IP_INFO:
1484                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1485                         if_name =
1486                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1487
1488                         if (if_name == NULL) {
1489                                 /*
1490                                  * We could not map the mac address to an
1491                                  * interface name; return error.
1492                                  */
1493                                 hv_msg->error = HV_E_FAIL;
1494                                 break;
1495                         }
1496                         error = kvp_get_ip_info(
1497                                                 0, if_name, KVP_OP_GET_IP_INFO,
1498                                                 kvp_ip_val,
1499                                                 (MAX_IP_ADDR_SIZE * 2));
1500
1501                         if (error)
1502                                 hv_msg->error = error;
1503
1504                         free(if_name);
1505                         break;
1506
1507                 case KVP_OP_SET_IP_INFO:
1508                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1509                         if_name = kvp_get_if_name(
1510                                         (char *)kvp_ip_val->adapter_id);
1511                         if (if_name == NULL) {
1512                                 /*
1513                                  * We could not map the guid to an
1514                                  * interface name; return error.
1515                                  */
1516                                 hv_msg->error = HV_GUID_NOTFOUND;
1517                                 break;
1518                         }
1519                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1520                         if (error)
1521                                 hv_msg->error = error;
1522
1523                         free(if_name);
1524                         break;
1525
1526                 case KVP_OP_SET:
1527                         if (kvp_key_add_or_modify(pool,
1528                                         hv_msg->body.kvp_set.data.key,
1529                                         hv_msg->body.kvp_set.data.key_size,
1530                                         hv_msg->body.kvp_set.data.value,
1531                                         hv_msg->body.kvp_set.data.value_size))
1532                                         hv_msg->error = HV_S_CONT;
1533                         break;
1534
1535                 case KVP_OP_GET:
1536                         if (kvp_get_value(pool,
1537                                         hv_msg->body.kvp_set.data.key,
1538                                         hv_msg->body.kvp_set.data.key_size,
1539                                         hv_msg->body.kvp_set.data.value,
1540                                         hv_msg->body.kvp_set.data.value_size))
1541                                         hv_msg->error = HV_S_CONT;
1542                         break;
1543
1544                 case KVP_OP_DELETE:
1545                         if (kvp_key_delete(pool,
1546                                         hv_msg->body.kvp_delete.key,
1547                                         hv_msg->body.kvp_delete.key_size))
1548                                         hv_msg->error = HV_S_CONT;
1549                         break;
1550
1551                 default:
1552                         break;
1553                 }
1554
1555                 if (op != KVP_OP_ENUMERATE)
1556                         goto kvp_done;
1557
1558                 /*
1559                  * If the pool is KVP_POOL_AUTO, dynamically generate
1560                  * both the key and the value; if not read from the
1561                  * appropriate pool.
1562                  */
1563                 if (pool != KVP_POOL_AUTO) {
1564                         if (kvp_pool_enumerate(pool,
1565                                         hv_msg->body.kvp_enum_data.index,
1566                                         hv_msg->body.kvp_enum_data.data.key,
1567                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1568                                         hv_msg->body.kvp_enum_data.data.value,
1569                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1570                                         hv_msg->error = HV_S_CONT;
1571                         goto kvp_done;
1572                 }
1573
1574                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1575                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1576
1577                 switch (hv_msg->body.kvp_enum_data.index) {
1578                 case FullyQualifiedDomainName:
1579                         strcpy(key_value, full_domain_name);
1580                         strcpy(key_name, "FullyQualifiedDomainName");
1581                         break;
1582                 case IntegrationServicesVersion:
1583                         strcpy(key_name, "IntegrationServicesVersion");
1584                         strcpy(key_value, lic_version);
1585                         break;
1586                 case NetworkAddressIPv4:
1587                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1588                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1589                         strcpy(key_name, "NetworkAddressIPv4");
1590                         break;
1591                 case NetworkAddressIPv6:
1592                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1593                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1594                         strcpy(key_name, "NetworkAddressIPv6");
1595                         break;
1596                 case OSBuildNumber:
1597                         strcpy(key_value, os_build);
1598                         strcpy(key_name, "OSBuildNumber");
1599                         break;
1600                 case OSName:
1601                         strcpy(key_value, os_name);
1602                         strcpy(key_name, "OSName");
1603                         break;
1604                 case OSMajorVersion:
1605                         strcpy(key_value, os_major);
1606                         strcpy(key_name, "OSMajorVersion");
1607                         break;
1608                 case OSMinorVersion:
1609                         strcpy(key_value, os_minor);
1610                         strcpy(key_name, "OSMinorVersion");
1611                         break;
1612                 case OSVersion:
1613                         strcpy(key_value, os_version);
1614                         strcpy(key_name, "OSVersion");
1615                         break;
1616                 case ProcessorArchitecture:
1617                         strcpy(key_value, processor_arch);
1618                         strcpy(key_name, "ProcessorArchitecture");
1619                         break;
1620                 default:
1621                         hv_msg->error = HV_S_CONT;
1622                         break;
1623                 }
1624
1625                 /* Send the value back to the kernel. */
1626 kvp_done:
1627                 len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1628                 if (len != sizeof(struct hv_kvp_msg)) {
1629                         syslog(LOG_ERR, "write failed; error: %d %s", errno,
1630                                strerror(errno));
1631                         exit(EXIT_FAILURE);
1632                 }
1633         }
1634
1635         close(kvp_fd);
1636         exit(0);
1637 }