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/poll.h>
  26 #include <sys/utsname.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #include <arpa/inet.h>
  34 #include <linux/hyperv.h>
  35 #include <ifaddrs.h>
  36 #include <netdb.h>
  37 #include <syslog.h>
  38 #include <sys/stat.h>
  39 #include <fcntl.h>
  40 #include <dirent.h>
  41 #include <net/if.h>
  42 #include <limits.h>
  43 #include <getopt.h>
  44
  45 /*
  46  * KVP protocol: The user mode component first registers with the
  47  * the kernel component. Subsequently, the kernel component requests, data
  48  * for the specified keys. In response to this message the user mode component
  49  * fills in the value corresponding to the specified key. We overload the
  50  * sequence field in the cn_msg header to define our KVP message types.
  51  *
  52  * We use this infrastructure for also supporting queries from user mode
  53  * application for state that may be maintained in the KVP kernel component.
  54  *
  55  */
  56
  57
  58 enum key_index {
  59         FullyQualifiedDomainName = 0,
  60         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  61         NetworkAddressIPv4,
  62         NetworkAddressIPv6,
  63         OSBuildNumber,
  64         OSName,
  65         OSMajorVersion,
  66         OSMinorVersion,
  67         OSVersion,
  68         ProcessorArchitecture
  69 };
  70
  71
  72 enum {
  73         IPADDR = 0,
  74         NETMASK,
  75         GATEWAY,
  76         DNS
  77 };
  78
  79 static int in_hand_shake = 1;
  80
  81 static char *os_name = "";
  82 static char *os_major = "";
  83 static char *os_minor = "";
  84 static char *processor_arch;
  85 static char *os_build;
  86 static char *os_version;
  87 static char *lic_version = "Unknown version";
  88 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  89 static struct utsname uts_buf;
  90
  91 /*
  92  * The location of the interface configuration file.
  93  */
  94
  95 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
  96
  97 #ifndef KVP_SCRIPTS_PATH
  98 #define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
  99 #endif
 100
 101 #define KVP_NET_DIR "/sys/class/net/"
 102
 103 #define MAX_FILE_NAME 100
 104 #define ENTRIES_PER_BLOCK 50
 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, *x;
 561         char    *if_name = NULL;
 562         char    buf[256];
 563         char dev_id[PATH_MAX];
 564
 565         dir = opendir(KVP_NET_DIR);
 566         if (dir == NULL)
 567                 return NULL;
 568
 569         while ((entry = readdir(dir)) != NULL) {
 570                 /*
 571                  * Set the state for the next pass.
 572                  */
 573                 snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
 574                          KVP_NET_DIR, entry->d_name);
 575
 576                 file = fopen(dev_id, "r");
 577                 if (file == NULL)
 578                         continue;
 579
 580                 p = fgets(buf, sizeof(buf), file);
 581                 if (p) {
 582                         x = strchr(p, '\n');
 583                         if (x)
 584                                 *x = '\0';
 585
 586                         if (!strcmp(p, guid)) {
 587                                 /*
 588                                  * Found the guid match; return the interface
 589                                  * name. The caller will free the memory.
 590                                  */
 591                                 if_name = strdup(entry->d_name);
 592                                 fclose(file);
 593                                 break;
 594                         }
 595                 }
 596                 fclose(file);
 597         }
 598
 599         closedir(dir);
 600         return if_name;
 601 }
 602
 603 /*
 604  * Retrieve the MAC address given the interface name.
 605  */
 606
 607 static char *kvp_if_name_to_mac(char *if_name)
 608 {
 609         FILE    *file;
 610         char    *p, *x;
 611         char    buf[256];
 612         char addr_file[PATH_MAX];
 613         unsigned int i;
 614         char *mac_addr = NULL;
 615
 616         snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
 617                  if_name, "/address");
 618
 619         file = fopen(addr_file, "r");
 620         if (file == NULL)
 621                 return NULL;
 622
 623         p = fgets(buf, sizeof(buf), file);
 624         if (p) {
 625                 x = strchr(p, '\n');
 626                 if (x)
 627                         *x = '\0';
 628                 for (i = 0; i < strlen(p); i++)
 629                         p[i] = toupper(p[i]);
 630                 mac_addr = strdup(p);
 631         }
 632
 633         fclose(file);
 634         return mac_addr;
 635 }
 636
 637
 638 /*
 639  * Retrieve the interface name given tha MAC address.
 640  */
 641
 642 static char *kvp_mac_to_if_name(char *mac)
 643 {
 644         DIR *dir;
 645         struct dirent *entry;
 646         FILE    *file;
 647         char    *p, *x;
 648         char    *if_name = NULL;
 649         char    buf[256];
 650         char dev_id[PATH_MAX];
 651         unsigned int i;
 652
 653         dir = opendir(KVP_NET_DIR);
 654         if (dir == NULL)
 655                 return NULL;
 656
 657         while ((entry = readdir(dir)) != NULL) {
 658                 /*
 659                  * Set the state for the next pass.
 660                  */
 661                 snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
 662                          entry->d_name);
 663
 664                 file = fopen(dev_id, "r");
 665                 if (file == NULL)
 666                         continue;
 667
 668                 p = fgets(buf, sizeof(buf), file);
 669                 if (p) {
 670                         x = strchr(p, '\n');
 671                         if (x)
 672                                 *x = '\0';
 673
 674                         for (i = 0; i < strlen(p); i++)
 675                                 p[i] = toupper(p[i]);
 676
 677                         if (!strcmp(p, mac)) {
 678                                 /*
 679                                  * Found the MAC match; return the interface
 680                                  * name. The caller will free the memory.
 681                                  */
 682                                 if_name = strdup(entry->d_name);
 683                                 fclose(file);
 684                                 break;
 685                         }
 686                 }
 687                 fclose(file);
 688         }
 689
 690         closedir(dir);
 691         return if_name;
 692 }
 693
 694
 695 static void kvp_process_ipconfig_file(char *cmd,
 696                                         char *config_buf, unsigned int len,
 697                                         int element_size, int offset)
 698 {
 699         char buf[256];
 700         char *p;
 701         char *x;
 702         FILE *file;
 703
 704         /*
 705          * First execute the command.
 706          */
 707         file = popen(cmd, "r");
 708         if (file == NULL)
 709                 return;
 710
 711         if (offset == 0)
 712                 memset(config_buf, 0, len);
 713         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 714                 if (len < strlen(config_buf) + element_size + 1)
 715                         break;
 716
 717                 x = strchr(p, '\n');
 718                 if (x)
 719                         *x = '\0';
 720
 721                 strcat(config_buf, p);
 722                 strcat(config_buf, ";");
 723         }
 724         pclose(file);
 725 }
 726
 727 static void kvp_get_ipconfig_info(char *if_name,
 728                                  struct hv_kvp_ipaddr_value *buffer)
 729 {
 730         char cmd[512];
 731         char dhcp_info[128];
 732         char *p;
 733         FILE *file;
 734
 735         /*
 736          * Get the address of default gateway (ipv4).
 737          */
 738         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 739         strcat(cmd, " | awk '/default/ {print $3 }'");
 740
 741         /*
 742          * Execute the command to gather gateway info.
 743          */
 744         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 745                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 746
 747         /*
 748          * Get the address of default gateway (ipv6).
 749          */
 750         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 751         strcat(cmd, " | awk '/default/ {print $3 }'");
 752
 753         /*
 754          * Execute the command to gather gateway info (ipv6).
 755          */
 756         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 757                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 758
 759
 760         /*
 761          * Gather the DNS  state.
 762          * Since there is no standard way to get this information
 763          * across various distributions of interest; we just invoke
 764          * an external script that needs to be ported across distros
 765          * of interest.
 766          *
 767          * Following is the expected format of the information from the script:
 768          *
 769          * ipaddr1 (nameserver1)
 770          * ipaddr2 (nameserver2)
 771          * .
 772          * .
 773          */
 774
 775         sprintf(cmd, KVP_SCRIPTS_PATH "%s",  "hv_get_dns_info");
 776
 777         /*
 778          * Execute the command to gather DNS info.
 779          */
 780         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 781                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 782
 783         /*
 784          * Gather the DHCP state.
 785          * We will gather this state by invoking an external script.
 786          * The parameter to the script is the interface name.
 787          * Here is the expected output:
 788          *
 789          * Enabled: DHCP enabled.
 790          */
 791
 792         sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dhcp_info", if_name);
 793
 794         file = popen(cmd, "r");
 795         if (file == NULL)
 796                 return;
 797
 798         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 799         if (p == NULL) {
 800                 pclose(file);
 801                 return;
 802         }
 803
 804         if (!strncmp(p, "Enabled", 7))
 805                 buffer->dhcp_enabled = 1;
 806         else
 807                 buffer->dhcp_enabled = 0;
 808
 809         pclose(file);
 810 }
 811
 812
 813 static unsigned int hweight32(unsigned int *w)
 814 {
 815         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 816         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 817         res = (res + (res >> 4)) & 0x0F0F0F0F;
 818         res = res + (res >> 8);
 819         return (res + (res >> 16)) & 0x000000FF;
 820 }
 821
 822 static int kvp_process_ip_address(void *addrp,
 823                                 int family, char *buffer,
 824                                 int length,  int *offset)
 825 {
 826         struct sockaddr_in *addr;
 827         struct sockaddr_in6 *addr6;
 828         int addr_length;
 829         char tmp[50];
 830         const char *str;
 831
 832         if (family == AF_INET) {
 833                 addr = (struct sockaddr_in *)addrp;
 834                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 835                 addr_length = INET_ADDRSTRLEN;
 836         } else {
 837                 addr6 = (struct sockaddr_in6 *)addrp;
 838                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 839                 addr_length = INET6_ADDRSTRLEN;
 840         }
 841
 842         if ((length - *offset) < addr_length + 2)
 843                 return HV_E_FAIL;
 844         if (str == NULL) {
 845                 strcpy(buffer, "inet_ntop failed\n");
 846                 return HV_E_FAIL;
 847         }
 848         if (*offset == 0)
 849                 strcpy(buffer, tmp);
 850         else {
 851                 strcat(buffer, ";");
 852                 strcat(buffer, tmp);
 853         }
 854
 855         *offset += strlen(str) + 1;
 856
 857         return 0;
 858 }
 859
 860 static int
 861 kvp_get_ip_info(int family, char *if_name, int op,
 862                  void  *out_buffer, unsigned int length)
 863 {
 864         struct ifaddrs *ifap;
 865         struct ifaddrs *curp;
 866         int offset = 0;
 867         int sn_offset = 0;
 868         int error = 0;
 869         char *buffer;
 870         struct hv_kvp_ipaddr_value *ip_buffer = NULL;
 871         char cidr_mask[5]; /* /xyz */
 872         int weight;
 873         int i;
 874         unsigned int *w;
 875         char *sn_str;
 876         struct sockaddr_in6 *addr6;
 877
 878         if (op == KVP_OP_ENUMERATE) {
 879                 buffer = out_buffer;
 880         } else {
 881                 ip_buffer = out_buffer;
 882                 buffer = (char *)ip_buffer->ip_addr;
 883                 ip_buffer->addr_family = 0;
 884         }
 885         /*
 886          * On entry into this function, the buffer is capable of holding the
 887          * maximum key value.
 888          */
 889
 890         if (getifaddrs(&ifap)) {
 891                 strcpy(buffer, "getifaddrs failed\n");
 892                 return HV_E_FAIL;
 893         }
 894
 895         curp = ifap;
 896         while (curp != NULL) {
 897                 if (curp->ifa_addr == NULL) {
 898                         curp = curp->ifa_next;
 899                         continue;
 900                 }
 901
 902                 if ((if_name != NULL) &&
 903                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 904                         /*
 905                          * We want info about a specific interface;
 906                          * just continue.
 907                          */
 908                         curp = curp->ifa_next;
 909                         continue;
 910                 }
 911
 912                 /*
 913                  * We only support two address families: AF_INET and AF_INET6.
 914                  * If a family value of 0 is specified, we collect both
 915                  * supported address families; if not we gather info on
 916                  * the specified address family.
 917                  */
 918                 if ((((family != 0) &&
 919                          (curp->ifa_addr->sa_family != family))) ||
 920                          (curp->ifa_flags & IFF_LOOPBACK)) {
 921                         curp = curp->ifa_next;
 922                         continue;
 923                 }
 924                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 925                         (curp->ifa_addr->sa_family != AF_INET6)) {
 926                         curp = curp->ifa_next;
 927                         continue;
 928                 }
 929
 930                 if (op == KVP_OP_GET_IP_INFO) {
 931                         /*
 932                          * Gather info other than the IP address.
 933                          * IP address info will be gathered later.
 934                          */
 935                         if (curp->ifa_addr->sa_family == AF_INET) {
 936                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 937                                 /*
 938                                  * Get subnet info.
 939                                  */
 940                                 error = kvp_process_ip_address(
 941                                                              curp->ifa_netmask,
 942                                                              AF_INET,
 943                                                              (char *)
 944                                                              ip_buffer->sub_net,
 945                                                              length,
 946                                                              &sn_offset);
 947                                 if (error)
 948                                         goto gather_ipaddr;
 949                         } else {
 950                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 951
 952                                 /*
 953                                  * Get subnet info in CIDR format.
 954                                  */
 955                                 weight = 0;
 956                                 sn_str = (char *)ip_buffer->sub_net;
 957                                 addr6 = (struct sockaddr_in6 *)
 958                                         curp->ifa_netmask;
 959                                 w = addr6->sin6_addr.s6_addr32;
 960
 961                                 for (i = 0; i < 4; i++)
 962                                         weight += hweight32(&w[i]);
 963
 964                                 sprintf(cidr_mask, "/%d", weight);
 965                                 if (length < sn_offset + strlen(cidr_mask) + 1)
 966                                         goto gather_ipaddr;
 967
 968                                 if (sn_offset == 0)
 969                                         strcpy(sn_str, cidr_mask);
 970                                 else {
 971                                         strcat((char *)ip_buffer->sub_net, ";");
 972                                         strcat(sn_str, cidr_mask);
 973                                 }
 974                                 sn_offset += strlen(sn_str) + 1;
 975                         }
 976
 977                         /*
 978                          * Collect other ip related configuration info.
 979                          */
 980
 981                         kvp_get_ipconfig_info(if_name, ip_buffer);
 982                 }
 983
 984 gather_ipaddr:
 985                 error = kvp_process_ip_address(curp->ifa_addr,
 986                                                 curp->ifa_addr->sa_family,
 987                                                 buffer,
 988                                                 length, &offset);
 989                 if (error)
 990                         goto getaddr_done;
 991
 992                 curp = curp->ifa_next;
 993         }
 994
 995 getaddr_done:
 996         freeifaddrs(ifap);
 997         return error;
 998 }
 999
1000
1001 static int expand_ipv6(char *addr, int type)
1002 {
1003         int ret;
1004         struct in6_addr v6_addr;
1005
1006         ret = inet_pton(AF_INET6, addr, &v6_addr);
1007
1008         if (ret != 1) {
1009                 if (type == NETMASK)
1010                         return 1;
1011                 return 0;
1012         }
1013
1014         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1015                 "%02x%02x:%02x%02x:%02x%02x",
1016                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1017                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1018                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1019                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1020                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1021                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1022                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1023                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1024
1025         return 1;
1026
1027 }
1028
1029 static int is_ipv4(char *addr)
1030 {
1031         int ret;
1032         struct in_addr ipv4_addr;
1033
1034         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1035
1036         if (ret == 1)
1037                 return 1;
1038         return 0;
1039 }
1040
1041 static int parse_ip_val_buffer(char *in_buf, int *offset,
1042                                 char *out_buf, int out_len)
1043 {
1044         char *x;
1045         char *start;
1046
1047         /*
1048          * in_buf has sequence of characters that are seperated by
1049          * the character ';'. The last sequence does not have the
1050          * terminating ";" character.
1051          */
1052         start = in_buf + *offset;
1053
1054         x = strchr(start, ';');
1055         if (x)
1056                 *x = 0;
1057         else
1058                 x = start + strlen(start);
1059
1060         if (strlen(start) != 0) {
1061                 int i = 0;
1062                 /*
1063                  * Get rid of leading spaces.
1064                  */
1065                 while (start[i] == ' ')
1066                         i++;
1067
1068                 if ((x - start) <= out_len) {
1069                         strcpy(out_buf, (start + i));
1070                         *offset += (x - start) + 1;
1071                         return 1;
1072                 }
1073         }
1074         return 0;
1075 }
1076
1077 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1078 {
1079         int ret;
1080
1081         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1082
1083         if (ret < 0)
1084                 return HV_E_FAIL;
1085
1086         return 0;
1087 }
1088
1089
1090 static int process_ip_string(FILE *f, char *ip_string, int type)
1091 {
1092         int error = 0;
1093         char addr[INET6_ADDRSTRLEN];
1094         int i = 0;
1095         int j = 0;
1096         char str[256];
1097         char sub_str[13];
1098         int offset = 0;
1099
1100         memset(addr, 0, sizeof(addr));
1101
1102         while (parse_ip_val_buffer(ip_string, &offset, addr,
1103                                         (MAX_IP_ADDR_SIZE * 2))) {
1104
1105                 sub_str[0] = 0;
1106                 if (is_ipv4(addr)) {
1107                         switch (type) {
1108                         case IPADDR:
1109                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1110                                 break;
1111                         case NETMASK:
1112                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1113                                 break;
1114                         case GATEWAY:
1115                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1116                                 break;
1117                         case DNS:
1118                                 snprintf(str, sizeof(str), "%s", "DNS");
1119                                 break;
1120                         }
1121
1122                         if (type == DNS) {
1123                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1124                         } else if (type == GATEWAY && i == 0) {
1125                                 ++i;
1126                         } else {
1127                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1128                         }
1129
1130
1131                 } else if (expand_ipv6(addr, type)) {
1132                         switch (type) {
1133                         case IPADDR:
1134                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1135                                 break;
1136                         case NETMASK:
1137                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1138                                 break;
1139                         case GATEWAY:
1140                                 snprintf(str, sizeof(str), "%s",
1141                                         "IPV6_DEFAULTGW");
1142                                 break;
1143                         case DNS:
1144                                 snprintf(str, sizeof(str), "%s",  "DNS");
1145                                 break;
1146                         }
1147
1148                         if (type == DNS) {
1149                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1150                         } else if (j == 0) {
1151                                 ++j;
1152                         } else {
1153                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1154                         }
1155                 } else {
1156                         return  HV_INVALIDARG;
1157                 }
1158
1159                 error = kvp_write_file(f, str, sub_str, addr);
1160                 if (error)
1161                         return error;
1162                 memset(addr, 0, sizeof(addr));
1163         }
1164
1165         return 0;
1166 }
1167
1168 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1169 {
1170         int error = 0;
1171         char if_file[PATH_MAX];
1172         FILE *file;
1173         char cmd[PATH_MAX];
1174         char *mac_addr;
1175         int str_len;
1176
1177         /*
1178          * Set the configuration for the specified interface with
1179          * the information provided. Since there is no standard
1180          * way to configure an interface, we will have an external
1181          * script that does the job of configuring the interface and
1182          * flushing the configuration.
1183          *
1184          * The parameters passed to this external script are:
1185          * 1. A configuration file that has the specified configuration.
1186          *
1187          * We will embed the name of the interface in the configuration
1188          * file: ifcfg-ethx (where ethx is the interface name).
1189          *
1190          * The information provided here may be more than what is needed
1191          * in a given distro to configure the interface and so are free
1192          * ignore information that may not be relevant.
1193          *
1194          * Here is the format of the ip configuration file:
1195          *
1196          * HWADDR=macaddr
1197          * DEVICE=interface name
1198          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1199          *                       or "none" if no boot-time protocol should be used)
1200          *
1201          * IPADDR0=ipaddr1
1202          * IPADDR1=ipaddr2
1203          * IPADDRx=ipaddry (where y = x + 1)
1204          *
1205          * NETMASK0=netmask1
1206          * NETMASKx=netmasky (where y = x + 1)
1207          *
1208          * GATEWAY=ipaddr1
1209          * GATEWAYx=ipaddry (where y = x + 1)
1210          *
1211          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1212          *
1213          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1214          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1215          * IPV6NETMASK.
1216          *
1217          * The host can specify multiple ipv4 and ipv6 addresses to be
1218          * configured for the interface. Furthermore, the configuration
1219          * needs to be persistent. A subsequent GET call on the interface
1220          * is expected to return the configuration that is set via the SET
1221          * call.
1222          */
1223
1224         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1225                 "/ifcfg-", if_name);
1226
1227         file = fopen(if_file, "w");
1228
1229         if (file == NULL) {
1230                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1231                                 errno, strerror(errno));
1232                 return HV_E_FAIL;
1233         }
1234
1235         /*
1236          * First write out the MAC address.
1237          */
1238
1239         mac_addr = kvp_if_name_to_mac(if_name);
1240         if (mac_addr == NULL) {
1241                 error = HV_E_FAIL;
1242                 goto setval_error;
1243         }
1244
1245         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1246         free(mac_addr);
1247         if (error)
1248                 goto setval_error;
1249
1250         error = kvp_write_file(file, "DEVICE", "", if_name);
1251         if (error)
1252                 goto setval_error;
1253
1254         /*
1255          * The dhcp_enabled flag is only for IPv4. In the case the host only
1256          * injects an IPv6 address, the flag is true, but we still need to
1257          * proceed to parse and pass the IPv6 information to the
1258          * disto-specific script hv_set_ifconfig.
1259          */
1260         if (new_val->dhcp_enabled) {
1261                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1262                 if (error)
1263                         goto setval_error;
1264
1265         } else {
1266                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1267                 if (error)
1268                         goto setval_error;
1269         }
1270
1271         /*
1272          * Write the configuration for ipaddress, netmask, gateway and
1273          * name servers.
1274          */
1275
1276         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1277         if (error)
1278                 goto setval_error;
1279
1280         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1281         if (error)
1282                 goto setval_error;
1283
1284         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1285         if (error)
1286                 goto setval_error;
1287
1288         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1289         if (error)
1290                 goto setval_error;
1291
1292         fclose(file);
1293
1294         /*
1295          * Now that we have populated the configuration file,
1296          * invoke the external script to do its magic.
1297          */
1298
1299         str_len = snprintf(cmd, sizeof(cmd), KVP_SCRIPTS_PATH "%s %s",
1300                            "hv_set_ifconfig", if_file);
1301         /*
1302          * This is a little overcautious, but it's necessary to suppress some
1303          * false warnings from gcc 8.0.1.
1304          */
1305         if (str_len <= 0 || (unsigned int)str_len >= sizeof(cmd)) {
1306                 syslog(LOG_ERR, "Cmd '%s' (len=%d) may be too long",
1307                        cmd, str_len);
1308                 return HV_E_FAIL;
1309         }
1310
1311         if (system(cmd)) {
1312                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1313                                 cmd, errno, strerror(errno));
1314                 return HV_E_FAIL;
1315         }
1316         return 0;
1317
1318 setval_error:
1319         syslog(LOG_ERR, "Failed to write config file");
1320         fclose(file);
1321         return error;
1322 }
1323
1324
1325 static void
1326 kvp_get_domain_name(char *buffer, int length)
1327 {
1328         struct addrinfo hints, *info ;
1329         int error = 0;
1330
1331         gethostname(buffer, length);
1332         memset(&hints, 0, sizeof(hints));
1333         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1334         hints.ai_socktype = SOCK_STREAM;
1335         hints.ai_flags = AI_CANONNAME;
1336
1337         error = getaddrinfo(buffer, NULL, &hints, &info);
1338         if (error != 0) {
1339                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1340                         error, gai_strerror(error));
1341                 return;
1342         }
1343         snprintf(buffer, length, "%s", info->ai_canonname);
1344         freeaddrinfo(info);
1345 }
1346
1347 void print_usage(char *argv[])
1348 {
1349         fprintf(stderr, "Usage: %s [options]\n"
1350                 "Options are:\n"
1351                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1352                 "  -h, --help             print this help\n", argv[0]);
1353 }
1354
1355 int main(int argc, char *argv[])
1356 {
1357         int kvp_fd, len;
1358         int error;
1359         struct pollfd pfd;
1360         char    *p;
1361         struct hv_kvp_msg hv_msg[1];
1362         char    *key_value;
1363         char    *key_name;
1364         int     op;
1365         int     pool;
1366         char    *if_name;
1367         struct hv_kvp_ipaddr_value *kvp_ip_val;
1368         int daemonize = 1, long_index = 0, opt;
1369
1370         static struct option long_options[] = {
1371                 {"help",        no_argument,       0,  'h' },
1372                 {"no-daemon",   no_argument,       0,  'n' },
1373                 {0,             0,                 0,  0   }
1374         };
1375
1376         while ((opt = getopt_long(argc, argv, "hn", long_options,
1377                                   &long_index)) != -1) {
1378                 switch (opt) {
1379                 case 'n':
1380                         daemonize = 0;
1381                         break;
1382                 case 'h':
1383                         print_usage(argv);
1384                         exit(0);
1385                 default:
1386                         print_usage(argv);
1387                         exit(EXIT_FAILURE);
1388                 }
1389         }
1390
1391         if (daemonize && daemon(1, 0))
1392                 return 1;
1393
1394         openlog("KVP", 0, LOG_USER);
1395         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1396
1397         kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
1398
1399         if (kvp_fd < 0) {
1400                 syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1401                         errno, strerror(errno));
1402                 exit(EXIT_FAILURE);
1403         }
1404
1405         /*
1406          * Retrieve OS release information.
1407          */
1408         kvp_get_os_info();
1409         /*
1410          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1411          * unpredictable amount of time to finish.
1412          */
1413         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1414
1415         if (kvp_file_init()) {
1416                 syslog(LOG_ERR, "Failed to initialize the pools");
1417                 exit(EXIT_FAILURE);
1418         }
1419
1420         /*
1421          * Register ourselves with the kernel.
1422          */
1423         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1424         len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1425         if (len != sizeof(struct hv_kvp_msg)) {
1426                 syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1427                        errno, strerror(errno));
1428                 close(kvp_fd);
1429                 exit(EXIT_FAILURE);
1430         }
1431
1432         pfd.fd = kvp_fd;
1433
1434         while (1) {
1435                 pfd.events = POLLIN;
1436                 pfd.revents = 0;
1437
1438                 if (poll(&pfd, 1, -1) < 0) {
1439                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1440                         if (errno == EINVAL) {
1441                                 close(kvp_fd);
1442                                 exit(EXIT_FAILURE);
1443                         }
1444                         else
1445                                 continue;
1446                 }
1447
1448                 len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1449
1450                 if (len != sizeof(struct hv_kvp_msg)) {
1451                         syslog(LOG_ERR, "read failed; error:%d %s",
1452                                errno, strerror(errno));
1453
1454                         close(kvp_fd);
1455                         return EXIT_FAILURE;
1456                 }
1457
1458                 /*
1459                  * We will use the KVP header information to pass back
1460                  * the error from this daemon. So, first copy the state
1461                  * and set the error code to success.
1462                  */
1463                 op = hv_msg->kvp_hdr.operation;
1464                 pool = hv_msg->kvp_hdr.pool;
1465                 hv_msg->error = HV_S_OK;
1466
1467                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1468                         /*
1469                          * Driver is registering with us; stash away the version
1470                          * information.
1471                          */
1472                         in_hand_shake = 0;
1473                         p = (char *)hv_msg->body.kvp_register.version;
1474                         lic_version = malloc(strlen(p) + 1);
1475                         if (lic_version) {
1476                                 strcpy(lic_version, p);
1477                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1478                                        lic_version);
1479                         } else {
1480                                 syslog(LOG_ERR, "malloc failed");
1481                         }
1482                         continue;
1483                 }
1484
1485                 switch (op) {
1486                 case KVP_OP_GET_IP_INFO:
1487                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1488                         if_name =
1489                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1490
1491                         if (if_name == NULL) {
1492                                 /*
1493                                  * We could not map the mac address to an
1494                                  * interface name; return error.
1495                                  */
1496                                 hv_msg->error = HV_E_FAIL;
1497                                 break;
1498                         }
1499                         error = kvp_get_ip_info(
1500                                                 0, if_name, KVP_OP_GET_IP_INFO,
1501                                                 kvp_ip_val,
1502                                                 (MAX_IP_ADDR_SIZE * 2));
1503
1504                         if (error)
1505                                 hv_msg->error = error;
1506
1507                         free(if_name);
1508                         break;
1509
1510                 case KVP_OP_SET_IP_INFO:
1511                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1512                         if_name = kvp_get_if_name(
1513                                         (char *)kvp_ip_val->adapter_id);
1514                         if (if_name == NULL) {
1515                                 /*
1516                                  * We could not map the guid to an
1517                                  * interface name; return error.
1518                                  */
1519                                 hv_msg->error = HV_GUID_NOTFOUND;
1520                                 break;
1521                         }
1522                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1523                         if (error)
1524                                 hv_msg->error = error;
1525
1526                         free(if_name);
1527                         break;
1528
1529                 case KVP_OP_SET:
1530                         if (kvp_key_add_or_modify(pool,
1531                                         hv_msg->body.kvp_set.data.key,
1532                                         hv_msg->body.kvp_set.data.key_size,
1533                                         hv_msg->body.kvp_set.data.value,
1534                                         hv_msg->body.kvp_set.data.value_size))
1535                                         hv_msg->error = HV_S_CONT;
1536                         break;
1537
1538                 case KVP_OP_GET:
1539                         if (kvp_get_value(pool,
1540                                         hv_msg->body.kvp_set.data.key,
1541                                         hv_msg->body.kvp_set.data.key_size,
1542                                         hv_msg->body.kvp_set.data.value,
1543                                         hv_msg->body.kvp_set.data.value_size))
1544                                         hv_msg->error = HV_S_CONT;
1545                         break;
1546
1547                 case KVP_OP_DELETE:
1548                         if (kvp_key_delete(pool,
1549                                         hv_msg->body.kvp_delete.key,
1550                                         hv_msg->body.kvp_delete.key_size))
1551                                         hv_msg->error = HV_S_CONT;
1552                         break;
1553
1554                 default:
1555                         break;
1556                 }
1557
1558                 if (op != KVP_OP_ENUMERATE)
1559                         goto kvp_done;
1560
1561                 /*
1562                  * If the pool is KVP_POOL_AUTO, dynamically generate
1563                  * both the key and the value; if not read from the
1564                  * appropriate pool.
1565                  */
1566                 if (pool != KVP_POOL_AUTO) {
1567                         if (kvp_pool_enumerate(pool,
1568                                         hv_msg->body.kvp_enum_data.index,
1569                                         hv_msg->body.kvp_enum_data.data.key,
1570                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1571                                         hv_msg->body.kvp_enum_data.data.value,
1572                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1573                                         hv_msg->error = HV_S_CONT;
1574                         goto kvp_done;
1575                 }
1576
1577                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1578                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1579
1580                 switch (hv_msg->body.kvp_enum_data.index) {
1581                 case FullyQualifiedDomainName:
1582                         strcpy(key_value, full_domain_name);
1583                         strcpy(key_name, "FullyQualifiedDomainName");
1584                         break;
1585                 case IntegrationServicesVersion:
1586                         strcpy(key_name, "IntegrationServicesVersion");
1587                         strcpy(key_value, lic_version);
1588                         break;
1589                 case NetworkAddressIPv4:
1590                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1591                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1592                         strcpy(key_name, "NetworkAddressIPv4");
1593                         break;
1594                 case NetworkAddressIPv6:
1595                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1596                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1597                         strcpy(key_name, "NetworkAddressIPv6");
1598                         break;
1599                 case OSBuildNumber:
1600                         strcpy(key_value, os_build);
1601                         strcpy(key_name, "OSBuildNumber");
1602                         break;
1603                 case OSName:
1604                         strcpy(key_value, os_name);
1605                         strcpy(key_name, "OSName");
1606                         break;
1607                 case OSMajorVersion:
1608                         strcpy(key_value, os_major);
1609                         strcpy(key_name, "OSMajorVersion");
1610                         break;
1611                 case OSMinorVersion:
1612                         strcpy(key_value, os_minor);
1613                         strcpy(key_name, "OSMinorVersion");
1614                         break;
1615                 case OSVersion:
1616                         strcpy(key_value, os_version);
1617                         strcpy(key_name, "OSVersion");
1618                         break;
1619                 case ProcessorArchitecture:
1620                         strcpy(key_value, processor_arch);
1621                         strcpy(key_name, "ProcessorArchitecture");
1622                         break;
1623                 default:
1624                         hv_msg->error = HV_S_CONT;
1625                         break;
1626                 }
1627
1628                 /* Send the value back to the kernel. */
1629 kvp_done:
1630                 len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1631                 if (len != sizeof(struct hv_kvp_msg)) {
1632                         syslog(LOG_ERR, "write failed; error: %d %s", errno,
1633                                strerror(errno));
1634                         exit(EXIT_FAILURE);
1635                 }
1636         }
1637
1638         close(kvp_fd);
1639         exit(0);
1640 }