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 <linux/types.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <string.h>
  34 #include <errno.h>
  35 #include <arpa/inet.h>
  36 #include <linux/connector.h>
  37 #include <linux/hyperv.h>
  38 #include <linux/netlink.h>
  39 #include <ifaddrs.h>
  40 #include <netdb.h>
  41 #include <syslog.h>
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44
  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 static char kvp_send_buffer[4096];
  72 static char kvp_recv_buffer[4096 * 2];
  73 static struct sockaddr_nl addr;
  74 static int in_hand_shake = 1;
  75
  76 static char *os_name = "";
  77 static char *os_major = "";
  78 static char *os_minor = "";
  79 static char *processor_arch;
  80 static char *os_build;
  81 static char *lic_version = "Unknown version";
  82 static struct utsname uts_buf;
  83
  84
  85 #define MAX_FILE_NAME 100
  86 #define ENTRIES_PER_BLOCK 50
  87
  88 struct kvp_record {
  89         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
  90         __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  91 };
  92
  93 struct kvp_file_state {
  94         int fd;
  95         int num_blocks;
  96         struct kvp_record *records;
  97         int num_records;
  98         __u8 fname[MAX_FILE_NAME];
  99 };
 100
 101 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 102
 103 static void kvp_acquire_lock(int pool)
 104 {
 105         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 106         fl.l_pid = getpid();
 107
 108         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 109                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
 110                 exit(-1);
 111         }
 112 }
 113
 114 static void kvp_release_lock(int pool)
 115 {
 116         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 117         fl.l_pid = getpid();
 118
 119         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 120                 perror("fcntl");
 121                 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
 122                 exit(-1);
 123         }
 124 }
 125
 126 static void kvp_update_file(int pool)
 127 {
 128         FILE *filep;
 129         size_t bytes_written;
 130
 131         /*
 132          * We are going to write our in-memory registry out to
 133          * disk; acquire the lock first.
 134          */
 135         kvp_acquire_lock(pool);
 136
 137         filep = fopen(kvp_file_info[pool].fname, "w");
 138         if (!filep) {
 139                 kvp_release_lock(pool);
 140                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 141                 exit(-1);
 142         }
 143
 144         bytes_written = fwrite(kvp_file_info[pool].records,
 145                                 sizeof(struct kvp_record),
 146                                 kvp_file_info[pool].num_records, filep);
 147
 148         fflush(filep);
 149         kvp_release_lock(pool);
 150 }
 151
 152 static void kvp_update_mem_state(int pool)
 153 {
 154         FILE *filep;
 155         size_t records_read = 0;
 156         struct kvp_record *record = kvp_file_info[pool].records;
 157         struct kvp_record *readp;
 158         int num_blocks = kvp_file_info[pool].num_blocks;
 159         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 160
 161         kvp_acquire_lock(pool);
 162
 163         filep = fopen(kvp_file_info[pool].fname, "r");
 164         if (!filep) {
 165                 kvp_release_lock(pool);
 166                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 167                 exit(-1);
 168         }
 169         while (!feof(filep)) {
 170                 readp = &record[records_read];
 171                 records_read += fread(readp, sizeof(struct kvp_record),
 172                                         ENTRIES_PER_BLOCK * num_blocks,
 173                                         filep);
 174
 175                 if (!feof(filep)) {
 176                         /*
 177                          * We have more data to read.
 178                          */
 179                         num_blocks++;
 180                         record = realloc(record, alloc_unit * num_blocks);
 181
 182                         if (record == NULL) {
 183                                 syslog(LOG_ERR, "malloc failed");
 184                                 exit(-1);
 185                         }
 186                         continue;
 187                 }
 188                 break;
 189         }
 190
 191         kvp_file_info[pool].num_blocks = num_blocks;
 192         kvp_file_info[pool].records = record;
 193         kvp_file_info[pool].num_records = records_read;
 194
 195         kvp_release_lock(pool);
 196 }
 197 static int kvp_file_init(void)
 198 {
 199         int ret, fd;
 200         FILE *filep;
 201         size_t records_read;
 202         __u8 *fname;
 203         struct kvp_record *record;
 204         struct kvp_record *readp;
 205         int num_blocks;
 206         int i;
 207         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 208
 209         if (access("/var/opt/hyperv", F_OK)) {
 210                 if (mkdir("/var/opt/hyperv", S_IRUSR | S_IWUSR | S_IROTH)) {
 211                         syslog(LOG_ERR, " Failed to create /var/opt/hyperv");
 212                         exit(-1);
 213                 }
 214         }
 215
 216         for (i = 0; i < KVP_POOL_COUNT; i++) {
 217                 fname = kvp_file_info[i].fname;
 218                 records_read = 0;
 219                 num_blocks = 1;
 220                 sprintf(fname, "/var/opt/hyperv/.kvp_pool_%d", i);
 221                 fd = open(fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IROTH);
 222
 223                 if (fd == -1)
 224                         return 1;
 225
 226
 227                 filep = fopen(fname, "r");
 228                 if (!filep)
 229                         return 1;
 230
 231                 record = malloc(alloc_unit * num_blocks);
 232                 if (record == NULL) {
 233                         fclose(filep);
 234                         return 1;
 235                 }
 236                 while (!feof(filep)) {
 237                         readp = &record[records_read];
 238                         records_read += fread(readp, sizeof(struct kvp_record),
 239                                         ENTRIES_PER_BLOCK,
 240                                         filep);
 241
 242                         if (!feof(filep)) {
 243                                 /*
 244                                  * We have more data to read.
 245                                  */
 246                                 num_blocks++;
 247                                 record = realloc(record, alloc_unit *
 248                                                 num_blocks);
 249                                 if (record == NULL) {
 250                                         fclose(filep);
 251                                         return 1;
 252                                 }
 253                                 continue;
 254                         }
 255                         break;
 256                 }
 257                 kvp_file_info[i].fd = fd;
 258                 kvp_file_info[i].num_blocks = num_blocks;
 259                 kvp_file_info[i].records = record;
 260                 kvp_file_info[i].num_records = records_read;
 261                 fclose(filep);
 262
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int kvp_key_delete(int pool, __u8 *key, int key_size)
 269 {
 270         int i;
 271         int j, k;
 272         int num_records;
 273         struct kvp_record *record;
 274
 275         /*
 276          * First update the in-memory state.
 277          */
 278         kvp_update_mem_state(pool);
 279
 280         num_records = kvp_file_info[pool].num_records;
 281         record = kvp_file_info[pool].records;
 282
 283         for (i = 0; i < num_records; i++) {
 284                 if (memcmp(key, record[i].key, key_size))
 285                         continue;
 286                 /*
 287                  * Found a match; just move the remaining
 288                  * entries up.
 289                  */
 290                 if (i == num_records) {
 291                         kvp_file_info[pool].num_records--;
 292                         kvp_update_file(pool);
 293                         return 0;
 294                 }
 295
 296                 j = i;
 297                 k = j + 1;
 298                 for (; k < num_records; k++) {
 299                         strcpy(record[j].key, record[k].key);
 300                         strcpy(record[j].value, record[k].value);
 301                         j++;
 302                 }
 303
 304                 kvp_file_info[pool].num_records--;
 305                 kvp_update_file(pool);
 306                 return 0;
 307         }
 308         return 1;
 309 }
 310
 311 static int kvp_key_add_or_modify(int pool, __u8 *key, int key_size, __u8 *value,
 312                         int value_size)
 313 {
 314         int i;
 315         int j, k;
 316         int num_records;
 317         struct kvp_record *record;
 318         int num_blocks;
 319
 320         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 321                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 322                 return 1;
 323
 324         /*
 325          * First update the in-memory state.
 326          */
 327         kvp_update_mem_state(pool);
 328
 329         num_records = kvp_file_info[pool].num_records;
 330         record = kvp_file_info[pool].records;
 331         num_blocks = kvp_file_info[pool].num_blocks;
 332
 333         for (i = 0; i < num_records; i++) {
 334                 if (memcmp(key, record[i].key, key_size))
 335                         continue;
 336                 /*
 337                  * Found a match; just update the value -
 338                  * this is the modify case.
 339                  */
 340                 memcpy(record[i].value, value, value_size);
 341                 kvp_update_file(pool);
 342                 return 0;
 343         }
 344
 345         /*
 346          * Need to add a new entry;
 347          */
 348         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 349                 /* Need to allocate a larger array for reg entries. */
 350                 record = realloc(record, sizeof(struct kvp_record) *
 351                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 352
 353                 if (record == NULL)
 354                         return 1;
 355                 kvp_file_info[pool].num_blocks++;
 356
 357         }
 358         memcpy(record[i].value, value, value_size);
 359         memcpy(record[i].key, key, key_size);
 360         kvp_file_info[pool].records = record;
 361         kvp_file_info[pool].num_records++;
 362         kvp_update_file(pool);
 363         return 0;
 364 }
 365
 366 static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
 367                         int value_size)
 368 {
 369         int i;
 370         int num_records;
 371         struct kvp_record *record;
 372
 373         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 374                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 375                 return 1;
 376
 377         /*
 378          * First update the in-memory state.
 379          */
 380         kvp_update_mem_state(pool);
 381
 382         num_records = kvp_file_info[pool].num_records;
 383         record = kvp_file_info[pool].records;
 384
 385         for (i = 0; i < num_records; i++) {
 386                 if (memcmp(key, record[i].key, key_size))
 387                         continue;
 388                 /*
 389                  * Found a match; just copy the value out.
 390                  */
 391                 memcpy(value, record[i].value, value_size);
 392                 return 0;
 393         }
 394
 395         return 1;
 396 }
 397
 398 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
 399                                 __u8 *value, int value_size)
 400 {
 401         struct kvp_record *record;
 402
 403         /*
 404          * First update our in-memory database.
 405          */
 406         kvp_update_mem_state(pool);
 407         record = kvp_file_info[pool].records;
 408
 409         if (index >= kvp_file_info[pool].num_records) {
 410                 return 1;
 411         }
 412
 413         memcpy(key, record[index].key, key_size);
 414         memcpy(value, record[index].value, value_size);
 415         return 0;
 416 }
 417
 418
 419 void kvp_get_os_info(void)
 420 {
 421         FILE    *file;
 422         char    *p, buf[512];
 423
 424         uname(&uts_buf);
 425         os_build = uts_buf.release;
 426         processor_arch = uts_buf.machine;
 427
 428         /*
 429          * The current windows host (win7) expects the build
 430          * string to be of the form: x.y.z
 431          * Strip additional information we may have.
 432          */
 433         p = strchr(os_build, '-');
 434         if (p)
 435                 *p = '\0';
 436
 437         file = fopen("/etc/SuSE-release", "r");
 438         if (file != NULL)
 439                 goto kvp_osinfo_found;
 440         file  = fopen("/etc/redhat-release", "r");
 441         if (file != NULL)
 442                 goto kvp_osinfo_found;
 443         /*
 444          * Add code for other supported platforms.
 445          */
 446
 447         /*
 448          * We don't have information about the os.
 449          */
 450         os_name = uts_buf.sysname;
 451         return;
 452
 453 kvp_osinfo_found:
 454         /* up to three lines */
 455         p = fgets(buf, sizeof(buf), file);
 456         if (p) {
 457                 p = strchr(buf, '\n');
 458                 if (p)
 459                         *p = '\0';
 460                 p = strdup(buf);
 461                 if (!p)
 462                         goto done;
 463                 os_name = p;
 464
 465                 /* second line */
 466                 p = fgets(buf, sizeof(buf), file);
 467                 if (p) {
 468                         p = strchr(buf, '\n');
 469                         if (p)
 470                                 *p = '\0';
 471                         p = strdup(buf);
 472                         if (!p)
 473                                 goto done;
 474                         os_major = p;
 475
 476                         /* third line */
 477                         p = fgets(buf, sizeof(buf), file);
 478                         if (p)  {
 479                                 p = strchr(buf, '\n');
 480                                 if (p)
 481                                         *p = '\0';
 482                                 p = strdup(buf);
 483                                 if (p)
 484                                         os_minor = p;
 485                         }
 486                 }
 487         }
 488
 489 done:
 490         fclose(file);
 491         return;
 492 }
 493
 494 static int kvp_process_ip_address(void *addrp,
 495                                 int family, char *buffer,
 496                                 int length,  int *offset)
 497 {
 498         struct sockaddr_in *addr;
 499         struct sockaddr_in6 *addr6;
 500         int addr_length;
 501         char tmp[50];
 502         const char *str;
 503
 504         if (family == AF_INET) {
 505                 addr = (struct sockaddr_in *)addrp;
 506                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 507                 addr_length = INET_ADDRSTRLEN;
 508         } else {
 509                 addr6 = (struct sockaddr_in6 *)addrp;
 510                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 511                 addr_length = INET6_ADDRSTRLEN;
 512         }
 513
 514         if ((length - *offset) < addr_length + 1)
 515                 return 1;
 516         if (str == NULL) {
 517                 strcpy(buffer, "inet_ntop failed\n");
 518                 return 1;
 519         }
 520         if (*offset == 0)
 521                 strcpy(buffer, tmp);
 522         else
 523                 strcat(buffer, tmp);
 524         strcat(buffer, ";");
 525
 526         *offset += strlen(str) + 1;
 527         return 0;
 528 }
 529
 530 static int
 531 kvp_get_ip_address(int family, char *if_name, int op,
 532                  void  *out_buffer, int length)
 533 {
 534         struct ifaddrs *ifap;
 535         struct ifaddrs *curp;
 536         int offset = 0;
 537         const char *str;
 538         int error = 0;
 539         char *buffer;
 540         struct hv_kvp_ipaddr_value *ip_buffer;
 541
 542         if (op == KVP_OP_ENUMERATE) {
 543                 buffer = out_buffer;
 544         } else {
 545                 ip_buffer = out_buffer;
 546                 buffer = (char *)ip_buffer->ip_addr;
 547                 ip_buffer->addr_family = 0;
 548         }
 549         /*
 550          * On entry into this function, the buffer is capable of holding the
 551          * maximum key value.
 552          */
 553
 554         if (getifaddrs(&ifap)) {
 555                 strcpy(buffer, "getifaddrs failed\n");
 556                 return 1;
 557         }
 558
 559         curp = ifap;
 560         while (curp != NULL) {
 561                 if (curp->ifa_addr == NULL) {
 562                         curp = curp->ifa_next;
 563                         continue;
 564                 }
 565
 566                 if ((if_name != NULL) &&
 567                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 568                         /*
 569                          * We want info about a specific interface;
 570                          * just continue.
 571                          */
 572                         curp = curp->ifa_next;
 573                         continue;
 574                 }
 575
 576                 /*
 577                  * We only support two address families: AF_INET and AF_INET6.
 578                  * If a family value of 0 is specified, we collect both
 579                  * supported address families; if not we gather info on
 580                  * the specified address family.
 581                  */
 582                 if ((family != 0) && (curp->ifa_addr->sa_family != family)) {
 583                         curp = curp->ifa_next;
 584                         continue;
 585                 }
 586                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 587                         (curp->ifa_addr->sa_family != AF_INET6)) {
 588                         curp = curp->ifa_next;
 589                         continue;
 590                 }
 591
 592                 if (op == KVP_OP_GET_IP_INFO) {
 593                         /*
 594                          * Gather info other than the IP address.
 595                          * IP address info will be gathered later.
 596                          */
 597                         if (curp->ifa_addr->sa_family == AF_INET)
 598                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 599                         else
 600                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 601                 }
 602
 603                 error = kvp_process_ip_address(curp->ifa_addr,
 604                                                 curp->ifa_addr->sa_family,
 605                                                 buffer,
 606                                                 length, &offset);
 607                 if (error)
 608                         goto getaddr_done;
 609
 610                 curp = curp->ifa_next;
 611         }
 612
 613 getaddr_done:
 614         freeifaddrs(ifap);
 615         return error;
 616 }
 617
 618
 619 static int
 620 kvp_get_domain_name(char *buffer, int length)
 621 {
 622         struct addrinfo hints, *info ;
 623         int error = 0;
 624
 625         gethostname(buffer, length);
 626         memset(&hints, 0, sizeof(hints));
 627         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
 628         hints.ai_socktype = SOCK_STREAM;
 629         hints.ai_flags = AI_CANONNAME;
 630
 631         error = getaddrinfo(buffer, NULL, &hints, &info);
 632         if (error != 0) {
 633                 strcpy(buffer, "getaddrinfo failed\n");
 634                 return error;
 635         }
 636         strcpy(buffer, info->ai_canonname);
 637         freeaddrinfo(info);
 638         return error;
 639 }
 640
 641 static int
 642 netlink_send(int fd, struct cn_msg *msg)
 643 {
 644         struct nlmsghdr *nlh;
 645         unsigned int size;
 646         struct msghdr message;
 647         char buffer[64];
 648         struct iovec iov[2];
 649
 650         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
 651
 652         nlh = (struct nlmsghdr *)buffer;
 653         nlh->nlmsg_seq = 0;
 654         nlh->nlmsg_pid = getpid();
 655         nlh->nlmsg_type = NLMSG_DONE;
 656         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
 657         nlh->nlmsg_flags = 0;
 658
 659         iov[0].iov_base = nlh;
 660         iov[0].iov_len = sizeof(*nlh);
 661
 662         iov[1].iov_base = msg;
 663         iov[1].iov_len = size;
 664
 665         memset(&message, 0, sizeof(message));
 666         message.msg_name = &addr;
 667         message.msg_namelen = sizeof(addr);
 668         message.msg_iov = iov;
 669         message.msg_iovlen = 2;
 670
 671         return sendmsg(fd, &message, 0);
 672 }
 673
 674 int main(void)
 675 {
 676         int fd, len, sock_opt;
 677         int error;
 678         struct cn_msg *message;
 679         struct pollfd pfd;
 680         struct nlmsghdr *incoming_msg;
 681         struct cn_msg   *incoming_cn_msg;
 682         struct hv_kvp_msg *hv_msg;
 683         char    *p;
 684         char    *key_value;
 685         char    *key_name;
 686         int     op;
 687         int     pool;
 688
 689         daemon(1, 0);
 690         openlog("KVP", 0, LOG_USER);
 691         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 692         /*
 693          * Retrieve OS release information.
 694          */
 695         kvp_get_os_info();
 696
 697         if (kvp_file_init()) {
 698                 syslog(LOG_ERR, "Failed to initialize the pools");
 699                 exit(-1);
 700         }
 701
 702         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 703         if (fd < 0) {
 704                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
 705                 exit(-1);
 706         }
 707         addr.nl_family = AF_NETLINK;
 708         addr.nl_pad = 0;
 709         addr.nl_pid = 0;
 710         addr.nl_groups = CN_KVP_IDX;
 711
 712
 713         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
 714         if (error < 0) {
 715                 syslog(LOG_ERR, "bind failed; error:%d", error);
 716                 close(fd);
 717                 exit(-1);
 718         }
 719         sock_opt = addr.nl_groups;
 720         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
 721         /*
 722          * Register ourselves with the kernel.
 723          */
 724         message = (struct cn_msg *)kvp_send_buffer;
 725         message->id.idx = CN_KVP_IDX;
 726         message->id.val = CN_KVP_VAL;
 727
 728         hv_msg = (struct hv_kvp_msg *)message->data;
 729         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
 730         message->ack = 0;
 731         message->len = sizeof(struct hv_kvp_msg);
 732
 733         len = netlink_send(fd, message);
 734         if (len < 0) {
 735                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
 736                 close(fd);
 737                 exit(-1);
 738         }
 739
 740         pfd.fd = fd;
 741
 742         while (1) {
 743                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
 744                 socklen_t addr_l = sizeof(addr);
 745                 pfd.events = POLLIN;
 746                 pfd.revents = 0;
 747                 poll(&pfd, 1, -1);
 748
 749                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
 750                                 addr_p, &addr_l);
 751
 752                 if (len < 0 || addr.nl_pid) {
 753                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
 754                                         addr.nl_pid, errno, strerror(errno));
 755                         close(fd);
 756                         return -1;
 757                 }
 758
 759                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
 760                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
 761                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 762
 763                 /*
 764                  * We will use the KVP header information to pass back
 765                  * the error from this daemon. So, first copy the state
 766                  * and set the error code to success.
 767                  */
 768                 op = hv_msg->kvp_hdr.operation;
 769                 pool = hv_msg->kvp_hdr.pool;
 770                 hv_msg->error = HV_S_OK;
 771
 772                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
 773                         /*
 774                          * Driver is registering with us; stash away the version
 775                          * information.
 776                          */
 777                         in_hand_shake = 0;
 778                         p = (char *)hv_msg->body.kvp_register.version;
 779                         lic_version = malloc(strlen(p) + 1);
 780                         if (lic_version) {
 781                                 strcpy(lic_version, p);
 782                                 syslog(LOG_INFO, "KVP LIC Version: %s",
 783                                         lic_version);
 784                         } else {
 785                                 syslog(LOG_ERR, "malloc failed");
 786                         }
 787                         continue;
 788                 }
 789
 790                 switch (op) {
 791                 case KVP_OP_SET:
 792                         if (kvp_key_add_or_modify(pool,
 793                                         hv_msg->body.kvp_set.data.key,
 794                                         hv_msg->body.kvp_set.data.key_size,
 795                                         hv_msg->body.kvp_set.data.value,
 796                                         hv_msg->body.kvp_set.data.value_size))
 797                                         hv_msg->error = HV_S_CONT;
 798                         break;
 799
 800                 case KVP_OP_GET:
 801                         if (kvp_get_value(pool,
 802                                         hv_msg->body.kvp_set.data.key,
 803                                         hv_msg->body.kvp_set.data.key_size,
 804                                         hv_msg->body.kvp_set.data.value,
 805                                         hv_msg->body.kvp_set.data.value_size))
 806                                         hv_msg->error = HV_S_CONT;
 807                         break;
 808
 809                 case KVP_OP_DELETE:
 810                         if (kvp_key_delete(pool,
 811                                         hv_msg->body.kvp_delete.key,
 812                                         hv_msg->body.kvp_delete.key_size))
 813                                         hv_msg->error = HV_S_CONT;
 814                         break;
 815
 816                 default:
 817                         break;
 818                 }
 819
 820                 if (op != KVP_OP_ENUMERATE)
 821                         goto kvp_done;
 822
 823                 /*
 824                  * If the pool is KVP_POOL_AUTO, dynamically generate
 825                  * both the key and the value; if not read from the
 826                  * appropriate pool.
 827                  */
 828                 if (pool != KVP_POOL_AUTO) {
 829                         if (kvp_pool_enumerate(pool,
 830                                         hv_msg->body.kvp_enum_data.index,
 831                                         hv_msg->body.kvp_enum_data.data.key,
 832                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
 833                                         hv_msg->body.kvp_enum_data.data.value,
 834                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 835                                         hv_msg->error = HV_S_CONT;
 836                         goto kvp_done;
 837                 }
 838
 839                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 840                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
 841                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
 842
 843                 switch (hv_msg->body.kvp_enum_data.index) {
 844                 case FullyQualifiedDomainName:
 845                         kvp_get_domain_name(key_value,
 846                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 847                         strcpy(key_name, "FullyQualifiedDomainName");
 848                         break;
 849                 case IntegrationServicesVersion:
 850                         strcpy(key_name, "IntegrationServicesVersion");
 851                         strcpy(key_value, lic_version);
 852                         break;
 853                 case NetworkAddressIPv4:
 854                         kvp_get_ip_address(AF_INET, NULL, KVP_OP_ENUMERATE,
 855                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 856                         strcpy(key_name, "NetworkAddressIPv4");
 857                         break;
 858                 case NetworkAddressIPv6:
 859                         kvp_get_ip_address(AF_INET6, NULL, KVP_OP_ENUMERATE,
 860                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 861                         strcpy(key_name, "NetworkAddressIPv6");
 862                         break;
 863                 case OSBuildNumber:
 864                         strcpy(key_value, os_build);
 865                         strcpy(key_name, "OSBuildNumber");
 866                         break;
 867                 case OSName:
 868                         strcpy(key_value, os_name);
 869                         strcpy(key_name, "OSName");
 870                         break;
 871                 case OSMajorVersion:
 872                         strcpy(key_value, os_major);
 873                         strcpy(key_name, "OSMajorVersion");
 874                         break;
 875                 case OSMinorVersion:
 876                         strcpy(key_value, os_minor);
 877                         strcpy(key_name, "OSMinorVersion");
 878                         break;
 879                 case OSVersion:
 880                         strcpy(key_value, os_build);
 881                         strcpy(key_name, "OSVersion");
 882                         break;
 883                 case ProcessorArchitecture:
 884                         strcpy(key_value, processor_arch);
 885                         strcpy(key_name, "ProcessorArchitecture");
 886                         break;
 887                 default:
 888                         hv_msg->error = HV_S_CONT;
 889                         break;
 890                 }
 891                 /*
 892                  * Send the value back to the kernel. The response is
 893                  * already in the receive buffer. Update the cn_msg header to
 894                  * reflect the key value that has been added to the message
 895                  */
 896 kvp_done:
 897
 898                 incoming_cn_msg->id.idx = CN_KVP_IDX;
 899                 incoming_cn_msg->id.val = CN_KVP_VAL;
 900                 incoming_cn_msg->ack = 0;
 901                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
 902
 903                 len = netlink_send(fd, incoming_cn_msg);
 904                 if (len < 0) {
 905                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
 906                         exit(-1);
 907                 }
 908         }
 909
 910 }