tools/hv/hv_kvp_daemon.c

   1 /*
   2  * An implementation of key value pair (KVP) functionality for Linux.
   3  *
   4  *
   5  * Copyright (C) 2010, Novell, Inc.
   6  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <sys/poll.h>
  28 #include <sys/utsname.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <errno.h>
  35 #include <arpa/inet.h>
  36 #include <linux/hyperv.h>
  37 #include <linux/netlink.h>
  38 #include <ifaddrs.h>
  39 #include <netdb.h>
  40 #include <syslog.h>
  41 #include <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <dirent.h>
  44 #include <net/if.h>
  45 #include <getopt.h>
  46
  47 /*
  48  * KVP protocol: The user mode component first registers with the
  49  * the kernel component. Subsequently, the kernel component requests, data
  50  * for the specified keys. In response to this message the user mode component
  51  * fills in the value corresponding to the specified key. We overload the
  52  * sequence field in the cn_msg header to define our KVP message types.
  53  *
  54  * We use this infrastructure for also supporting queries from user mode
  55  * application for state that may be maintained in the KVP kernel component.
  56  *
  57  */
  58
  59
  60 enum key_index {
  61         FullyQualifiedDomainName = 0,
  62         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  63         NetworkAddressIPv4,
  64         NetworkAddressIPv6,
  65         OSBuildNumber,
  66         OSName,
  67         OSMajorVersion,
  68         OSMinorVersion,
  69         OSVersion,
  70         ProcessorArchitecture
  71 };
  72
  73
  74 enum {
  75         IPADDR = 0,
  76         NETMASK,
  77         GATEWAY,
  78         DNS
  79 };
  80
  81 static int in_hand_shake = 1;
  82
  83 static char *os_name = "";
  84 static char *os_major = "";
  85 static char *os_minor = "";
  86 static char *processor_arch;
  87 static char *os_build;
  88 static char *os_version;
  89 static char *lic_version = "Unknown version";
  90 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  91 static struct utsname uts_buf;
  92
  93 /*
  94  * The location of the interface configuration file.
  95  */
  96
  97 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
  98
  99 #define MAX_FILE_NAME 100
 100 #define ENTRIES_PER_BLOCK 50
 101
 102 #ifndef SOL_NETLINK
 103 #define SOL_NETLINK 270
 104 #endif
 105
 106 struct kvp_record {
 107         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 108         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 109 };
 110
 111 struct kvp_file_state {
 112         int fd;
 113         int num_blocks;
 114         struct kvp_record *records;
 115         int num_records;
 116         char fname[MAX_FILE_NAME];
 117 };
 118
 119 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 120
 121 static void kvp_acquire_lock(int pool)
 122 {
 123         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 124         fl.l_pid = getpid();
 125
 126         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 127                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 128                                 errno, strerror(errno));
 129                 exit(EXIT_FAILURE);
 130         }
 131 }
 132
 133 static void kvp_release_lock(int pool)
 134 {
 135         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 136         fl.l_pid = getpid();
 137
 138         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 139                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 140                                 errno, strerror(errno));
 141                 exit(EXIT_FAILURE);
 142         }
 143 }
 144
 145 static void kvp_update_file(int pool)
 146 {
 147         FILE *filep;
 148
 149         /*
 150          * We are going to write our in-memory registry out to
 151          * disk; acquire the lock first.
 152          */
 153         kvp_acquire_lock(pool);
 154
 155         filep = fopen(kvp_file_info[pool].fname, "we");
 156         if (!filep) {
 157                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 158                                 errno, strerror(errno));
 159                 kvp_release_lock(pool);
 160                 exit(EXIT_FAILURE);
 161         }
 162
 163         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
 164                                 kvp_file_info[pool].num_records, filep);
 165
 166         if (ferror(filep) || fclose(filep)) {
 167                 kvp_release_lock(pool);
 168                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 169                 exit(EXIT_FAILURE);
 170         }
 171
 172         kvp_release_lock(pool);
 173 }
 174
 175 static void kvp_update_mem_state(int pool)
 176 {
 177         FILE *filep;
 178         size_t records_read = 0;
 179         struct kvp_record *record = kvp_file_info[pool].records;
 180         struct kvp_record *readp;
 181         int num_blocks = kvp_file_info[pool].num_blocks;
 182         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 183
 184         kvp_acquire_lock(pool);
 185
 186         filep = fopen(kvp_file_info[pool].fname, "re");
 187         if (!filep) {
 188                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 189                                 errno, strerror(errno));
 190                 kvp_release_lock(pool);
 191                 exit(EXIT_FAILURE);
 192         }
 193         for (;;) {
 194                 readp = &record[records_read];
 195                 records_read += fread(readp, sizeof(struct kvp_record),
 196                                         ENTRIES_PER_BLOCK * num_blocks,
 197                                         filep);
 198
 199                 if (ferror(filep)) {
 200                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
 201                         exit(EXIT_FAILURE);
 202                 }
 203
 204                 if (!feof(filep)) {
 205                         /*
 206                          * We have more data to read.
 207                          */
 208                         num_blocks++;
 209                         record = realloc(record, alloc_unit * num_blocks);
 210
 211                         if (record == NULL) {
 212                                 syslog(LOG_ERR, "malloc failed");
 213                                 exit(EXIT_FAILURE);
 214                         }
 215                         continue;
 216                 }
 217                 break;
 218         }
 219
 220         kvp_file_info[pool].num_blocks = num_blocks;
 221         kvp_file_info[pool].records = record;
 222         kvp_file_info[pool].num_records = records_read;
 223
 224         fclose(filep);
 225         kvp_release_lock(pool);
 226 }
 227 static int kvp_file_init(void)
 228 {
 229         int  fd;
 230         FILE *filep;
 231         size_t records_read;
 232         char *fname;
 233         struct kvp_record *record;
 234         struct kvp_record *readp;
 235         int num_blocks;
 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                 records_read = 0;
 250                 num_blocks = 1;
 251                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 252                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 253
 254                 if (fd == -1)
 255                         return 1;
 256
 257
 258                 filep = fopen(fname, "re");
 259                 if (!filep) {
 260                         close(fd);
 261                         return 1;
 262                 }
 263
 264                 record = malloc(alloc_unit * num_blocks);
 265                 if (record == NULL) {
 266                         fclose(filep);
 267                         close(fd);
 268                         return 1;
 269                 }
 270                 for (;;) {
 271                         readp = &record[records_read];
 272                         records_read += fread(readp, sizeof(struct kvp_record),
 273                                         ENTRIES_PER_BLOCK,
 274                                         filep);
 275
 276                         if (ferror(filep)) {
 277                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 278                                        i);
 279                                 exit(EXIT_FAILURE);
 280                         }
 281
 282                         if (!feof(filep)) {
 283                                 /*
 284                                  * We have more data to read.
 285                                  */
 286                                 num_blocks++;
 287                                 record = realloc(record, alloc_unit *
 288                                                 num_blocks);
 289                                 if (record == NULL) {
 290                                         fclose(filep);
 291                                         close(fd);
 292                                         return 1;
 293                                 }
 294                                 continue;
 295                         }
 296                         break;
 297                 }
 298                 kvp_file_info[i].fd = fd;
 299                 kvp_file_info[i].num_blocks = num_blocks;
 300                 kvp_file_info[i].records = record;
 301                 kvp_file_info[i].num_records = records_read;
 302                 fclose(filep);
 303
 304         }
 305
 306         return 0;
 307 }
 308
 309 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
 310 {
 311         int i;
 312         int j, k;
 313         int num_records;
 314         struct kvp_record *record;
 315
 316         /*
 317          * First update the in-memory state.
 318          */
 319         kvp_update_mem_state(pool);
 320
 321         num_records = kvp_file_info[pool].num_records;
 322         record = kvp_file_info[pool].records;
 323
 324         for (i = 0; i < num_records; i++) {
 325                 if (memcmp(key, record[i].key, key_size))
 326                         continue;
 327                 /*
 328                  * Found a match; just move the remaining
 329                  * entries up.
 330                  */
 331                 if (i == num_records) {
 332                         kvp_file_info[pool].num_records--;
 333                         kvp_update_file(pool);
 334                         return 0;
 335                 }
 336
 337                 j = i;
 338                 k = j + 1;
 339                 for (; k < num_records; k++) {
 340                         strcpy(record[j].key, record[k].key);
 341                         strcpy(record[j].value, record[k].value);
 342                         j++;
 343                 }
 344
 345                 kvp_file_info[pool].num_records--;
 346                 kvp_update_file(pool);
 347                 return 0;
 348         }
 349         return 1;
 350 }
 351
 352 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
 353                                  const __u8 *value, int value_size)
 354 {
 355         int i;
 356         int num_records;
 357         struct kvp_record *record;
 358         int num_blocks;
 359
 360         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 361                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 362                 return 1;
 363
 364         /*
 365          * First update the in-memory state.
 366          */
 367         kvp_update_mem_state(pool);
 368
 369         num_records = kvp_file_info[pool].num_records;
 370         record = kvp_file_info[pool].records;
 371         num_blocks = kvp_file_info[pool].num_blocks;
 372
 373         for (i = 0; i < num_records; i++) {
 374                 if (memcmp(key, record[i].key, key_size))
 375                         continue;
 376                 /*
 377                  * Found a match; just update the value -
 378                  * this is the modify case.
 379                  */
 380                 memcpy(record[i].value, value, value_size);
 381                 kvp_update_file(pool);
 382                 return 0;
 383         }
 384
 385         /*
 386          * Need to add a new entry;
 387          */
 388         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 389                 /* Need to allocate a larger array for reg entries. */
 390                 record = realloc(record, sizeof(struct kvp_record) *
 391                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 392
 393                 if (record == NULL)
 394                         return 1;
 395                 kvp_file_info[pool].num_blocks++;
 396
 397         }
 398         memcpy(record[i].value, value, value_size);
 399         memcpy(record[i].key, key, key_size);
 400         kvp_file_info[pool].records = record;
 401         kvp_file_info[pool].num_records++;
 402         kvp_update_file(pool);
 403         return 0;
 404 }
 405
 406 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
 407                         int value_size)
 408 {
 409         int i;
 410         int num_records;
 411         struct kvp_record *record;
 412
 413         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 414                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 415                 return 1;
 416
 417         /*
 418          * First update the in-memory state.
 419          */
 420         kvp_update_mem_state(pool);
 421
 422         num_records = kvp_file_info[pool].num_records;
 423         record = kvp_file_info[pool].records;
 424
 425         for (i = 0; i < num_records; i++) {
 426                 if (memcmp(key, record[i].key, key_size))
 427                         continue;
 428                 /*
 429                  * Found a match; just copy the value out.
 430                  */
 431                 memcpy(value, record[i].value, value_size);
 432                 return 0;
 433         }
 434
 435         return 1;
 436 }
 437
 438 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
 439                                 __u8 *value, int value_size)
 440 {
 441         struct kvp_record *record;
 442
 443         /*
 444          * First update our in-memory database.
 445          */
 446         kvp_update_mem_state(pool);
 447         record = kvp_file_info[pool].records;
 448
 449         if (index >= kvp_file_info[pool].num_records) {
 450                 return 1;
 451         }
 452
 453         memcpy(key, record[index].key, key_size);
 454         memcpy(value, record[index].value, value_size);
 455         return 0;
 456 }
 457
 458
 459 void kvp_get_os_info(void)
 460 {
 461         FILE    *file;
 462         char    *p, buf[512];
 463
 464         uname(&uts_buf);
 465         os_version = uts_buf.release;
 466         os_build = strdup(uts_buf.release);
 467
 468         os_name = uts_buf.sysname;
 469         processor_arch = uts_buf.machine;
 470
 471         /*
 472          * The current windows host (win7) expects the build
 473          * string to be of the form: x.y.z
 474          * Strip additional information we may have.
 475          */
 476         p = strchr(os_version, '-');
 477         if (p)
 478                 *p = '\0';
 479
 480         /*
 481          * Parse the /etc/os-release file if present:
 482          * http://www.freedesktop.org/software/systemd/man/os-release.html
 483          */
 484         file = fopen("/etc/os-release", "r");
 485         if (file != NULL) {
 486                 while (fgets(buf, sizeof(buf), file)) {
 487                         char *value, *q;
 488
 489                         /* Ignore comments */
 490                         if (buf[0] == '#')
 491                                 continue;
 492
 493                         /* Split into name=value */
 494                         p = strchr(buf, '=');
 495                         if (!p)
 496                                 continue;
 497                         *p++ = 0;
 498
 499                         /* Remove quotes and newline; un-escape */
 500                         value = p;
 501                         q = p;
 502                         while (*p) {
 503                                 if (*p == '\\') {
 504                                         ++p;
 505                                         if (!*p)
 506                                                 break;
 507                                         *q++ = *p++;
 508                                 } else if (*p == '\'' || *p == '"' ||
 509                                            *p == '\n') {
 510                                         ++p;
 511                                 } else {
 512                                         *q++ = *p++;
 513                                 }
 514                         }
 515                         *q = 0;
 516
 517                         if (!strcmp(buf, "NAME")) {
 518                                 p = strdup(value);
 519                                 if (!p)
 520                                         break;
 521                                 os_name = p;
 522                         } else if (!strcmp(buf, "VERSION_ID")) {
 523                                 p = strdup(value);
 524                                 if (!p)
 525                                         break;
 526                                 os_major = p;
 527                         }
 528                 }
 529                 fclose(file);
 530                 return;
 531         }
 532
 533         /* Fallback for older RH/SUSE releases */
 534         file = fopen("/etc/SuSE-release", "r");
 535         if (file != NULL)
 536                 goto kvp_osinfo_found;
 537         file  = fopen("/etc/redhat-release", "r");
 538         if (file != NULL)
 539                 goto kvp_osinfo_found;
 540
 541         /*
 542          * We don't have information about the os.
 543          */
 544         return;
 545
 546 kvp_osinfo_found:
 547         /* up to three lines */
 548         p = fgets(buf, sizeof(buf), file);
 549         if (p) {
 550                 p = strchr(buf, '\n');
 551                 if (p)
 552                         *p = '\0';
 553                 p = strdup(buf);
 554                 if (!p)
 555                         goto done;
 556                 os_name = p;
 557
 558                 /* second line */
 559                 p = fgets(buf, sizeof(buf), file);
 560                 if (p) {
 561                         p = strchr(buf, '\n');
 562                         if (p)
 563                                 *p = '\0';
 564                         p = strdup(buf);
 565                         if (!p)
 566                                 goto done;
 567                         os_major = p;
 568
 569                         /* third line */
 570                         p = fgets(buf, sizeof(buf), file);
 571                         if (p)  {
 572                                 p = strchr(buf, '\n');
 573                                 if (p)
 574                                         *p = '\0';
 575                                 p = strdup(buf);
 576                                 if (p)
 577                                         os_minor = p;
 578                         }
 579                 }
 580         }
 581
 582 done:
 583         fclose(file);
 584         return;
 585 }
 586
 587
 588
 589 /*
 590  * Retrieve an interface name corresponding to the specified guid.
 591  * If there is a match, the function returns a pointer
 592  * to the interface name and if not, a NULL is returned.
 593  * If a match is found, the caller is responsible for
 594  * freeing the memory.
 595  */
 596
 597 static char *kvp_get_if_name(char *guid)
 598 {
 599         DIR *dir;
 600         struct dirent *entry;
 601         FILE    *file;
 602         char    *p, *q, *x;
 603         char    *if_name = NULL;
 604         char    buf[256];
 605         char *kvp_net_dir = "/sys/class/net/";
 606         char dev_id[256];
 607
 608         dir = opendir(kvp_net_dir);
 609         if (dir == NULL)
 610                 return NULL;
 611
 612         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 613         q = dev_id + strlen(kvp_net_dir);
 614
 615         while ((entry = readdir(dir)) != NULL) {
 616                 /*
 617                  * Set the state for the next pass.
 618                  */
 619                 *q = '\0';
 620                 strcat(dev_id, entry->d_name);
 621                 strcat(dev_id, "/device/device_id");
 622
 623                 file = fopen(dev_id, "r");
 624                 if (file == NULL)
 625                         continue;
 626
 627                 p = fgets(buf, sizeof(buf), file);
 628                 if (p) {
 629                         x = strchr(p, '\n');
 630                         if (x)
 631                                 *x = '\0';
 632
 633                         if (!strcmp(p, guid)) {
 634                                 /*
 635                                  * Found the guid match; return the interface
 636                                  * name. The caller will free the memory.
 637                                  */
 638                                 if_name = strdup(entry->d_name);
 639                                 fclose(file);
 640                                 break;
 641                         }
 642                 }
 643                 fclose(file);
 644         }
 645
 646         closedir(dir);
 647         return if_name;
 648 }
 649
 650 /*
 651  * Retrieve the MAC address given the interface name.
 652  */
 653
 654 static char *kvp_if_name_to_mac(char *if_name)
 655 {
 656         FILE    *file;
 657         char    *p, *x;
 658         char    buf[256];
 659         char addr_file[256];
 660         unsigned int i;
 661         char *mac_addr = NULL;
 662
 663         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 664                 if_name, "/address");
 665
 666         file = fopen(addr_file, "r");
 667         if (file == NULL)
 668                 return NULL;
 669
 670         p = fgets(buf, sizeof(buf), file);
 671         if (p) {
 672                 x = strchr(p, '\n');
 673                 if (x)
 674                         *x = '\0';
 675                 for (i = 0; i < strlen(p); i++)
 676                         p[i] = toupper(p[i]);
 677                 mac_addr = strdup(p);
 678         }
 679
 680         fclose(file);
 681         return mac_addr;
 682 }
 683
 684
 685 /*
 686  * Retrieve the interface name given tha MAC address.
 687  */
 688
 689 static char *kvp_mac_to_if_name(char *mac)
 690 {
 691         DIR *dir;
 692         struct dirent *entry;
 693         FILE    *file;
 694         char    *p, *q, *x;
 695         char    *if_name = NULL;
 696         char    buf[256];
 697         char *kvp_net_dir = "/sys/class/net/";
 698         char dev_id[256];
 699         unsigned int i;
 700
 701         dir = opendir(kvp_net_dir);
 702         if (dir == NULL)
 703                 return NULL;
 704
 705         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 706         q = dev_id + strlen(kvp_net_dir);
 707
 708         while ((entry = readdir(dir)) != NULL) {
 709                 /*
 710                  * Set the state for the next pass.
 711                  */
 712                 *q = '\0';
 713
 714                 strcat(dev_id, entry->d_name);
 715                 strcat(dev_id, "/address");
 716
 717                 file = fopen(dev_id, "r");
 718                 if (file == NULL)
 719                         continue;
 720
 721                 p = fgets(buf, sizeof(buf), file);
 722                 if (p) {
 723                         x = strchr(p, '\n');
 724                         if (x)
 725                                 *x = '\0';
 726
 727                         for (i = 0; i < strlen(p); i++)
 728                                 p[i] = toupper(p[i]);
 729
 730                         if (!strcmp(p, mac)) {
 731                                 /*
 732                                  * Found the MAC match; return the interface
 733                                  * name. The caller will free the memory.
 734                                  */
 735                                 if_name = strdup(entry->d_name);
 736                                 fclose(file);
 737                                 break;
 738                         }
 739                 }
 740                 fclose(file);
 741         }
 742
 743         closedir(dir);
 744         return if_name;
 745 }
 746
 747
 748 static void kvp_process_ipconfig_file(char *cmd,
 749                                         char *config_buf, unsigned int len,
 750                                         int element_size, int offset)
 751 {
 752         char buf[256];
 753         char *p;
 754         char *x;
 755         FILE *file;
 756
 757         /*
 758          * First execute the command.
 759          */
 760         file = popen(cmd, "r");
 761         if (file == NULL)
 762                 return;
 763
 764         if (offset == 0)
 765                 memset(config_buf, 0, len);
 766         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 767                 if (len < strlen(config_buf) + element_size + 1)
 768                         break;
 769
 770                 x = strchr(p, '\n');
 771                 if (x)
 772                         *x = '\0';
 773
 774                 strcat(config_buf, p);
 775                 strcat(config_buf, ";");
 776         }
 777         pclose(file);
 778 }
 779
 780 static void kvp_get_ipconfig_info(char *if_name,
 781                                  struct hv_kvp_ipaddr_value *buffer)
 782 {
 783         char cmd[512];
 784         char dhcp_info[128];
 785         char *p;
 786         FILE *file;
 787
 788         /*
 789          * Get the address of default gateway (ipv4).
 790          */
 791         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 792         strcat(cmd, " | awk '/default/ {print $3 }'");
 793
 794         /*
 795          * Execute the command to gather gateway info.
 796          */
 797         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 798                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 799
 800         /*
 801          * Get the address of default gateway (ipv6).
 802          */
 803         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 804         strcat(cmd, " | awk '/default/ {print $3 }'");
 805
 806         /*
 807          * Execute the command to gather gateway info (ipv6).
 808          */
 809         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 810                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 811
 812
 813         /*
 814          * Gather the DNS  state.
 815          * Since there is no standard way to get this information
 816          * across various distributions of interest; we just invoke
 817          * an external script that needs to be ported across distros
 818          * of interest.
 819          *
 820          * Following is the expected format of the information from the script:
 821          *
 822          * ipaddr1 (nameserver1)
 823          * ipaddr2 (nameserver2)
 824          * .
 825          * .
 826          */
 827
 828         sprintf(cmd, "%s",  "hv_get_dns_info");
 829
 830         /*
 831          * Execute the command to gather DNS info.
 832          */
 833         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 834                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 835
 836         /*
 837          * Gather the DHCP state.
 838          * We will gather this state by invoking an external script.
 839          * The parameter to the script is the interface name.
 840          * Here is the expected output:
 841          *
 842          * Enabled: DHCP enabled.
 843          */
 844
 845         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 846
 847         file = popen(cmd, "r");
 848         if (file == NULL)
 849                 return;
 850
 851         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 852         if (p == NULL) {
 853                 pclose(file);
 854                 return;
 855         }
 856
 857         if (!strncmp(p, "Enabled", 7))
 858                 buffer->dhcp_enabled = 1;
 859         else
 860                 buffer->dhcp_enabled = 0;
 861
 862         pclose(file);
 863 }
 864
 865
 866 static unsigned int hweight32(unsigned int *w)
 867 {
 868         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 869         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 870         res = (res + (res >> 4)) & 0x0F0F0F0F;
 871         res = res + (res >> 8);
 872         return (res + (res >> 16)) & 0x000000FF;
 873 }
 874
 875 static int kvp_process_ip_address(void *addrp,
 876                                 int family, char *buffer,
 877                                 int length,  int *offset)
 878 {
 879         struct sockaddr_in *addr;
 880         struct sockaddr_in6 *addr6;
 881         int addr_length;
 882         char tmp[50];
 883         const char *str;
 884
 885         if (family == AF_INET) {
 886                 addr = (struct sockaddr_in *)addrp;
 887                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 888                 addr_length = INET_ADDRSTRLEN;
 889         } else {
 890                 addr6 = (struct sockaddr_in6 *)addrp;
 891                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 892                 addr_length = INET6_ADDRSTRLEN;
 893         }
 894
 895         if ((length - *offset) < addr_length + 2)
 896                 return HV_E_FAIL;
 897         if (str == NULL) {
 898                 strcpy(buffer, "inet_ntop failed\n");
 899                 return HV_E_FAIL;
 900         }
 901         if (*offset == 0)
 902                 strcpy(buffer, tmp);
 903         else {
 904                 strcat(buffer, ";");
 905                 strcat(buffer, tmp);
 906         }
 907
 908         *offset += strlen(str) + 1;
 909
 910         return 0;
 911 }
 912
 913 static int
 914 kvp_get_ip_info(int family, char *if_name, int op,
 915                  void  *out_buffer, unsigned int length)
 916 {
 917         struct ifaddrs *ifap;
 918         struct ifaddrs *curp;
 919         int offset = 0;
 920         int sn_offset = 0;
 921         int error = 0;
 922         char *buffer;
 923         struct hv_kvp_ipaddr_value *ip_buffer;
 924         char cidr_mask[5]; /* /xyz */
 925         int weight;
 926         int i;
 927         unsigned int *w;
 928         char *sn_str;
 929         struct sockaddr_in6 *addr6;
 930
 931         if (op == KVP_OP_ENUMERATE) {
 932                 buffer = out_buffer;
 933         } else {
 934                 ip_buffer = out_buffer;
 935                 buffer = (char *)ip_buffer->ip_addr;
 936                 ip_buffer->addr_family = 0;
 937         }
 938         /*
 939          * On entry into this function, the buffer is capable of holding the
 940          * maximum key value.
 941          */
 942
 943         if (getifaddrs(&ifap)) {
 944                 strcpy(buffer, "getifaddrs failed\n");
 945                 return HV_E_FAIL;
 946         }
 947
 948         curp = ifap;
 949         while (curp != NULL) {
 950                 if (curp->ifa_addr == NULL) {
 951                         curp = curp->ifa_next;
 952                         continue;
 953                 }
 954
 955                 if ((if_name != NULL) &&
 956                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 957                         /*
 958                          * We want info about a specific interface;
 959                          * just continue.
 960                          */
 961                         curp = curp->ifa_next;
 962                         continue;
 963                 }
 964
 965                 /*
 966                  * We only support two address families: AF_INET and AF_INET6.
 967                  * If a family value of 0 is specified, we collect both
 968                  * supported address families; if not we gather info on
 969                  * the specified address family.
 970                  */
 971                 if ((((family != 0) &&
 972                          (curp->ifa_addr->sa_family != family))) ||
 973                          (curp->ifa_flags & IFF_LOOPBACK)) {
 974                         curp = curp->ifa_next;
 975                         continue;
 976                 }
 977                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 978                         (curp->ifa_addr->sa_family != AF_INET6)) {
 979                         curp = curp->ifa_next;
 980                         continue;
 981                 }
 982
 983                 if (op == KVP_OP_GET_IP_INFO) {
 984                         /*
 985                          * Gather info other than the IP address.
 986                          * IP address info will be gathered later.
 987                          */
 988                         if (curp->ifa_addr->sa_family == AF_INET) {
 989                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 990                                 /*
 991                                  * Get subnet info.
 992                                  */
 993                                 error = kvp_process_ip_address(
 994                                                              curp->ifa_netmask,
 995                                                              AF_INET,
 996                                                              (char *)
 997                                                              ip_buffer->sub_net,
 998                                                              length,
 999                                                              &sn_offset);
1000                                 if (error)
1001                                         goto gather_ipaddr;
1002                         } else {
1003                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1004
1005                                 /*
1006                                  * Get subnet info in CIDR format.
1007                                  */
1008                                 weight = 0;
1009                                 sn_str = (char *)ip_buffer->sub_net;
1010                                 addr6 = (struct sockaddr_in6 *)
1011                                         curp->ifa_netmask;
1012                                 w = addr6->sin6_addr.s6_addr32;
1013
1014                                 for (i = 0; i < 4; i++)
1015                                         weight += hweight32(&w[i]);
1016
1017                                 sprintf(cidr_mask, "/%d", weight);
1018                                 if (length < sn_offset + strlen(cidr_mask) + 1)
1019                                         goto gather_ipaddr;
1020
1021                                 if (sn_offset == 0)
1022                                         strcpy(sn_str, cidr_mask);
1023                                 else {
1024                                         strcat((char *)ip_buffer->sub_net, ";");
1025                                         strcat(sn_str, cidr_mask);
1026                                 }
1027                                 sn_offset += strlen(sn_str) + 1;
1028                         }
1029
1030                         /*
1031                          * Collect other ip related configuration info.
1032                          */
1033
1034                         kvp_get_ipconfig_info(if_name, ip_buffer);
1035                 }
1036
1037 gather_ipaddr:
1038                 error = kvp_process_ip_address(curp->ifa_addr,
1039                                                 curp->ifa_addr->sa_family,
1040                                                 buffer,
1041                                                 length, &offset);
1042                 if (error)
1043                         goto getaddr_done;
1044
1045                 curp = curp->ifa_next;
1046         }
1047
1048 getaddr_done:
1049         freeifaddrs(ifap);
1050         return error;
1051 }
1052
1053
1054 static int expand_ipv6(char *addr, int type)
1055 {
1056         int ret;
1057         struct in6_addr v6_addr;
1058
1059         ret = inet_pton(AF_INET6, addr, &v6_addr);
1060
1061         if (ret != 1) {
1062                 if (type == NETMASK)
1063                         return 1;
1064                 return 0;
1065         }
1066
1067         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1068                 "%02x%02x:%02x%02x:%02x%02x",
1069                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1070                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1071                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1072                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1073                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1074                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1075                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1076                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1077
1078         return 1;
1079
1080 }
1081
1082 static int is_ipv4(char *addr)
1083 {
1084         int ret;
1085         struct in_addr ipv4_addr;
1086
1087         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1088
1089         if (ret == 1)
1090                 return 1;
1091         return 0;
1092 }
1093
1094 static int parse_ip_val_buffer(char *in_buf, int *offset,
1095                                 char *out_buf, int out_len)
1096 {
1097         char *x;
1098         char *start;
1099
1100         /*
1101          * in_buf has sequence of characters that are seperated by
1102          * the character ';'. The last sequence does not have the
1103          * terminating ";" character.
1104          */
1105         start = in_buf + *offset;
1106
1107         x = strchr(start, ';');
1108         if (x)
1109                 *x = 0;
1110         else
1111                 x = start + strlen(start);
1112
1113         if (strlen(start) != 0) {
1114                 int i = 0;
1115                 /*
1116                  * Get rid of leading spaces.
1117                  */
1118                 while (start[i] == ' ')
1119                         i++;
1120
1121                 if ((x - start) <= out_len) {
1122                         strcpy(out_buf, (start + i));
1123                         *offset += (x - start) + 1;
1124                         return 1;
1125                 }
1126         }
1127         return 0;
1128 }
1129
1130 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1131 {
1132         int ret;
1133
1134         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1135
1136         if (ret < 0)
1137                 return HV_E_FAIL;
1138
1139         return 0;
1140 }
1141
1142
1143 static int process_ip_string(FILE *f, char *ip_string, int type)
1144 {
1145         int error = 0;
1146         char addr[INET6_ADDRSTRLEN];
1147         int i = 0;
1148         int j = 0;
1149         char str[256];
1150         char sub_str[10];
1151         int offset = 0;
1152
1153         memset(addr, 0, sizeof(addr));
1154
1155         while (parse_ip_val_buffer(ip_string, &offset, addr,
1156                                         (MAX_IP_ADDR_SIZE * 2))) {
1157
1158                 sub_str[0] = 0;
1159                 if (is_ipv4(addr)) {
1160                         switch (type) {
1161                         case IPADDR:
1162                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1163                                 break;
1164                         case NETMASK:
1165                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1166                                 break;
1167                         case GATEWAY:
1168                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1169                                 break;
1170                         case DNS:
1171                                 snprintf(str, sizeof(str), "%s", "DNS");
1172                                 break;
1173                         }
1174
1175                         if (type == DNS) {
1176                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1177                         } else if (type == GATEWAY && i == 0) {
1178                                 ++i;
1179                         } else {
1180                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1181                         }
1182
1183
1184                 } else if (expand_ipv6(addr, type)) {
1185                         switch (type) {
1186                         case IPADDR:
1187                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1188                                 break;
1189                         case NETMASK:
1190                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1191                                 break;
1192                         case GATEWAY:
1193                                 snprintf(str, sizeof(str), "%s",
1194                                         "IPV6_DEFAULTGW");
1195                                 break;
1196                         case DNS:
1197                                 snprintf(str, sizeof(str), "%s",  "DNS");
1198                                 break;
1199                         }
1200
1201                         if (type == DNS) {
1202                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1203                         } else if (j == 0) {
1204                                 ++j;
1205                         } else {
1206                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1207                         }
1208                 } else {
1209                         return  HV_INVALIDARG;
1210                 }
1211
1212                 error = kvp_write_file(f, str, sub_str, addr);
1213                 if (error)
1214                         return error;
1215                 memset(addr, 0, sizeof(addr));
1216         }
1217
1218         return 0;
1219 }
1220
1221 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1222 {
1223         int error = 0;
1224         char if_file[128];
1225         FILE *file;
1226         char cmd[512];
1227         char *mac_addr;
1228
1229         /*
1230          * Set the configuration for the specified interface with
1231          * the information provided. Since there is no standard
1232          * way to configure an interface, we will have an external
1233          * script that does the job of configuring the interface and
1234          * flushing the configuration.
1235          *
1236          * The parameters passed to this external script are:
1237          * 1. A configuration file that has the specified configuration.
1238          *
1239          * We will embed the name of the interface in the configuration
1240          * file: ifcfg-ethx (where ethx is the interface name).
1241          *
1242          * The information provided here may be more than what is needed
1243          * in a given distro to configure the interface and so are free
1244          * ignore information that may not be relevant.
1245          *
1246          * Here is the format of the ip configuration file:
1247          *
1248          * HWADDR=macaddr
1249          * DEVICE=interface name
1250          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1251          *                       or "none" if no boot-time protocol should be used)
1252          *
1253          * IPADDR0=ipaddr1
1254          * IPADDR1=ipaddr2
1255          * IPADDRx=ipaddry (where y = x + 1)
1256          *
1257          * NETMASK0=netmask1
1258          * NETMASKx=netmasky (where y = x + 1)
1259          *
1260          * GATEWAY=ipaddr1
1261          * GATEWAYx=ipaddry (where y = x + 1)
1262          *
1263          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1264          *
1265          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1266          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1267          * IPV6NETMASK.
1268          *
1269          * The host can specify multiple ipv4 and ipv6 addresses to be
1270          * configured for the interface. Furthermore, the configuration
1271          * needs to be persistent. A subsequent GET call on the interface
1272          * is expected to return the configuration that is set via the SET
1273          * call.
1274          */
1275
1276         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1277                 "/ifcfg-", if_name);
1278
1279         file = fopen(if_file, "w");
1280
1281         if (file == NULL) {
1282                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1283                                 errno, strerror(errno));
1284                 return HV_E_FAIL;
1285         }
1286
1287         /*
1288          * First write out the MAC address.
1289          */
1290
1291         mac_addr = kvp_if_name_to_mac(if_name);
1292         if (mac_addr == NULL) {
1293                 error = HV_E_FAIL;
1294                 goto setval_error;
1295         }
1296
1297         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1298         free(mac_addr);
1299         if (error)
1300                 goto setval_error;
1301
1302         error = kvp_write_file(file, "DEVICE", "", if_name);
1303         if (error)
1304                 goto setval_error;
1305
1306         /*
1307          * The dhcp_enabled flag is only for IPv4. In the case the host only
1308          * injects an IPv6 address, the flag is true, but we still need to
1309          * proceed to parse and pass the IPv6 information to the
1310          * disto-specific script hv_set_ifconfig.
1311          */
1312         if (new_val->dhcp_enabled) {
1313                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1314                 if (error)
1315                         goto setval_error;
1316
1317         } else {
1318                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1319                 if (error)
1320                         goto setval_error;
1321         }
1322
1323         /*
1324          * Write the configuration for ipaddress, netmask, gateway and
1325          * name servers.
1326          */
1327
1328         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1329         if (error)
1330                 goto setval_error;
1331
1332         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1333         if (error)
1334                 goto setval_error;
1335
1336         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1337         if (error)
1338                 goto setval_error;
1339
1340         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1341         if (error)
1342                 goto setval_error;
1343
1344         fclose(file);
1345
1346         /*
1347          * Now that we have populated the configuration file,
1348          * invoke the external script to do its magic.
1349          */
1350
1351         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1352         if (system(cmd)) {
1353                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1354                                 cmd, errno, strerror(errno));
1355                 return HV_E_FAIL;
1356         }
1357         return 0;
1358
1359 setval_error:
1360         syslog(LOG_ERR, "Failed to write config file");
1361         fclose(file);
1362         return error;
1363 }
1364
1365
1366 static void
1367 kvp_get_domain_name(char *buffer, int length)
1368 {
1369         struct addrinfo hints, *info ;
1370         int error = 0;
1371
1372         gethostname(buffer, length);
1373         memset(&hints, 0, sizeof(hints));
1374         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1375         hints.ai_socktype = SOCK_STREAM;
1376         hints.ai_flags = AI_CANONNAME;
1377
1378         error = getaddrinfo(buffer, NULL, &hints, &info);
1379         if (error != 0) {
1380                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1381                         error, gai_strerror(error));
1382                 return;
1383         }
1384         snprintf(buffer, length, "%s", info->ai_canonname);
1385         freeaddrinfo(info);
1386 }
1387
1388 void print_usage(char *argv[])
1389 {
1390         fprintf(stderr, "Usage: %s [options]\n"
1391                 "Options are:\n"
1392                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1393                 "  -h, --help             print this help\n", argv[0]);
1394 }
1395
1396 int main(int argc, char *argv[])
1397 {
1398         int kvp_fd, len;
1399         int error;
1400         struct pollfd pfd;
1401         char    *p;
1402         struct hv_kvp_msg hv_msg[1];
1403         char    *key_value;
1404         char    *key_name;
1405         int     op;
1406         int     pool;
1407         char    *if_name;
1408         struct hv_kvp_ipaddr_value *kvp_ip_val;
1409         int daemonize = 1, long_index = 0, opt;
1410
1411         static struct option long_options[] = {
1412                 {"help",        no_argument,       0,  'h' },
1413                 {"no-daemon",   no_argument,       0,  'n' },
1414                 {0,             0,                 0,  0   }
1415         };
1416
1417         while ((opt = getopt_long(argc, argv, "hn", long_options,
1418                                   &long_index)) != -1) {
1419                 switch (opt) {
1420                 case 'n':
1421                         daemonize = 0;
1422                         break;
1423                 case 'h':
1424                 default:
1425                         print_usage(argv);
1426                         exit(EXIT_FAILURE);
1427                 }
1428         }
1429
1430         if (daemonize && daemon(1, 0))
1431                 return 1;
1432
1433         openlog("KVP", 0, LOG_USER);
1434         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1435
1436         kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR);
1437
1438         if (kvp_fd < 0) {
1439                 syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1440                         errno, strerror(errno));
1441                 exit(EXIT_FAILURE);
1442         }
1443
1444         /*
1445          * Retrieve OS release information.
1446          */
1447         kvp_get_os_info();
1448         /*
1449          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1450          * unpredictable amount of time to finish.
1451          */
1452         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1453
1454         if (kvp_file_init()) {
1455                 syslog(LOG_ERR, "Failed to initialize the pools");
1456                 exit(EXIT_FAILURE);
1457         }
1458
1459         /*
1460          * Register ourselves with the kernel.
1461          */
1462         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1463         len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1464         if (len != sizeof(struct hv_kvp_msg)) {
1465                 syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1466                        errno, strerror(errno));
1467                 close(kvp_fd);
1468                 exit(EXIT_FAILURE);
1469         }
1470
1471         pfd.fd = kvp_fd;
1472
1473         while (1) {
1474                 pfd.events = POLLIN;
1475                 pfd.revents = 0;
1476
1477                 if (poll(&pfd, 1, -1) < 0) {
1478                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1479                         if (errno == EINVAL) {
1480                                 close(kvp_fd);
1481                                 exit(EXIT_FAILURE);
1482                         }
1483                         else
1484                                 continue;
1485                 }
1486
1487                 len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1488
1489                 if (len != sizeof(struct hv_kvp_msg)) {
1490                         syslog(LOG_ERR, "read failed; error:%d %s",
1491                                errno, strerror(errno));
1492
1493                         close(kvp_fd);
1494                         return EXIT_FAILURE;
1495                 }
1496
1497                 /*
1498                  * We will use the KVP header information to pass back
1499                  * the error from this daemon. So, first copy the state
1500                  * and set the error code to success.
1501                  */
1502                 op = hv_msg->kvp_hdr.operation;
1503                 pool = hv_msg->kvp_hdr.pool;
1504                 hv_msg->error = HV_S_OK;
1505
1506                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1507                         /*
1508                          * Driver is registering with us; stash away the version
1509                          * information.
1510                          */
1511                         in_hand_shake = 0;
1512                         p = (char *)hv_msg->body.kvp_register.version;
1513                         lic_version = malloc(strlen(p) + 1);
1514                         if (lic_version) {
1515                                 strcpy(lic_version, p);
1516                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1517                                        lic_version);
1518                         } else {
1519                                 syslog(LOG_ERR, "malloc failed");
1520                         }
1521                         continue;
1522                 }
1523
1524                 switch (op) {
1525                 case KVP_OP_GET_IP_INFO:
1526                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1527                         if_name =
1528                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1529
1530                         if (if_name == NULL) {
1531                                 /*
1532                                  * We could not map the mac address to an
1533                                  * interface name; return error.
1534                                  */
1535                                 hv_msg->error = HV_E_FAIL;
1536                                 break;
1537                         }
1538                         error = kvp_get_ip_info(
1539                                                 0, if_name, KVP_OP_GET_IP_INFO,
1540                                                 kvp_ip_val,
1541                                                 (MAX_IP_ADDR_SIZE * 2));
1542
1543                         if (error)
1544                                 hv_msg->error = error;
1545
1546                         free(if_name);
1547                         break;
1548
1549                 case KVP_OP_SET_IP_INFO:
1550                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1551                         if_name = kvp_get_if_name(
1552                                         (char *)kvp_ip_val->adapter_id);
1553                         if (if_name == NULL) {
1554                                 /*
1555                                  * We could not map the guid to an
1556                                  * interface name; return error.
1557                                  */
1558                                 hv_msg->error = HV_GUID_NOTFOUND;
1559                                 break;
1560                         }
1561                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1562                         if (error)
1563                                 hv_msg->error = error;
1564
1565                         free(if_name);
1566                         break;
1567
1568                 case KVP_OP_SET:
1569                         if (kvp_key_add_or_modify(pool,
1570                                         hv_msg->body.kvp_set.data.key,
1571                                         hv_msg->body.kvp_set.data.key_size,
1572                                         hv_msg->body.kvp_set.data.value,
1573                                         hv_msg->body.kvp_set.data.value_size))
1574                                         hv_msg->error = HV_S_CONT;
1575                         break;
1576
1577                 case KVP_OP_GET:
1578                         if (kvp_get_value(pool,
1579                                         hv_msg->body.kvp_set.data.key,
1580                                         hv_msg->body.kvp_set.data.key_size,
1581                                         hv_msg->body.kvp_set.data.value,
1582                                         hv_msg->body.kvp_set.data.value_size))
1583                                         hv_msg->error = HV_S_CONT;
1584                         break;
1585
1586                 case KVP_OP_DELETE:
1587                         if (kvp_key_delete(pool,
1588                                         hv_msg->body.kvp_delete.key,
1589                                         hv_msg->body.kvp_delete.key_size))
1590                                         hv_msg->error = HV_S_CONT;
1591                         break;
1592
1593                 default:
1594                         break;
1595                 }
1596
1597                 if (op != KVP_OP_ENUMERATE)
1598                         goto kvp_done;
1599
1600                 /*
1601                  * If the pool is KVP_POOL_AUTO, dynamically generate
1602                  * both the key and the value; if not read from the
1603                  * appropriate pool.
1604                  */
1605                 if (pool != KVP_POOL_AUTO) {
1606                         if (kvp_pool_enumerate(pool,
1607                                         hv_msg->body.kvp_enum_data.index,
1608                                         hv_msg->body.kvp_enum_data.data.key,
1609                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1610                                         hv_msg->body.kvp_enum_data.data.value,
1611                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1612                                         hv_msg->error = HV_S_CONT;
1613                         goto kvp_done;
1614                 }
1615
1616                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1617                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1618
1619                 switch (hv_msg->body.kvp_enum_data.index) {
1620                 case FullyQualifiedDomainName:
1621                         strcpy(key_value, full_domain_name);
1622                         strcpy(key_name, "FullyQualifiedDomainName");
1623                         break;
1624                 case IntegrationServicesVersion:
1625                         strcpy(key_name, "IntegrationServicesVersion");
1626                         strcpy(key_value, lic_version);
1627                         break;
1628                 case NetworkAddressIPv4:
1629                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1630                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1631                         strcpy(key_name, "NetworkAddressIPv4");
1632                         break;
1633                 case NetworkAddressIPv6:
1634                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1635                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1636                         strcpy(key_name, "NetworkAddressIPv6");
1637                         break;
1638                 case OSBuildNumber:
1639                         strcpy(key_value, os_build);
1640                         strcpy(key_name, "OSBuildNumber");
1641                         break;
1642                 case OSName:
1643                         strcpy(key_value, os_name);
1644                         strcpy(key_name, "OSName");
1645                         break;
1646                 case OSMajorVersion:
1647                         strcpy(key_value, os_major);
1648                         strcpy(key_name, "OSMajorVersion");
1649                         break;
1650                 case OSMinorVersion:
1651                         strcpy(key_value, os_minor);
1652                         strcpy(key_name, "OSMinorVersion");
1653                         break;
1654                 case OSVersion:
1655                         strcpy(key_value, os_version);
1656                         strcpy(key_name, "OSVersion");
1657                         break;
1658                 case ProcessorArchitecture:
1659                         strcpy(key_value, processor_arch);
1660                         strcpy(key_name, "ProcessorArchitecture");
1661                         break;
1662                 default:
1663                         hv_msg->error = HV_S_CONT;
1664                         break;
1665                 }
1666
1667                 /* Send the value back to the kernel. */
1668 kvp_done:
1669                 len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1670                 if (len != sizeof(struct hv_kvp_msg)) {
1671                         syslog(LOG_ERR, "write failed; error: %d %s", errno,
1672                                strerror(errno));
1673                         exit(EXIT_FAILURE);
1674                 }
1675         }
1676
1677         close(kvp_fd);
1678         exit(0);
1679 }