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