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];
  73 static struct sockaddr_nl addr;
  74
  75 static char *os_name = "";
  76 static char *os_major = "";
  77 static char *os_minor = "";
  78 static char *processor_arch;
  79 static char *os_build;
  80 static char *lic_version;
  81 static struct utsname uts_buf;
  82
  83
  84 #define MAX_FILE_NAME 100
  85 #define ENTRIES_PER_BLOCK 50
  86
  87 struct kvp_record {
  88         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
  89         __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  90 };
  91
  92 struct kvp_file_state {
  93         int fd;
  94         int num_blocks;
  95         struct kvp_record *records;
  96         int num_records;
  97         __u8 fname[MAX_FILE_NAME];
  98 };
  99
 100 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 101
 102 static void kvp_acquire_lock(int pool)
 103 {
 104         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 105         fl.l_pid = getpid();
 106
 107         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 108                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
 109                 exit(-1);
 110         }
 111 }
 112
 113 static void kvp_release_lock(int pool)
 114 {
 115         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 116         fl.l_pid = getpid();
 117
 118         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 119                 perror("fcntl");
 120                 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
 121                 exit(-1);
 122         }
 123 }
 124
 125 static void kvp_update_file(int pool)
 126 {
 127         FILE *filep;
 128         size_t bytes_written;
 129
 130         /*
 131          * We are going to write our in-memory registry out to
 132          * disk; acquire the lock first.
 133          */
 134         kvp_acquire_lock(pool);
 135
 136         filep = fopen(kvp_file_info[pool].fname, "w");
 137         if (!filep) {
 138                 kvp_release_lock(pool);
 139                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 140                 exit(-1);
 141         }
 142
 143         bytes_written = fwrite(kvp_file_info[pool].records,
 144                                 sizeof(struct kvp_record),
 145                                 kvp_file_info[pool].num_records, filep);
 146
 147         fflush(filep);
 148         kvp_release_lock(pool);
 149 }
 150
 151 static void kvp_update_mem_state(int pool)
 152 {
 153         FILE *filep;
 154         size_t records_read = 0;
 155         struct kvp_record *record = kvp_file_info[pool].records;
 156         struct kvp_record *readp;
 157         int num_blocks = kvp_file_info[pool].num_blocks;
 158         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 159
 160         kvp_acquire_lock(pool);
 161
 162         filep = fopen(kvp_file_info[pool].fname, "r");
 163         if (!filep) {
 164                 kvp_release_lock(pool);
 165                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 166                 exit(-1);
 167         }
 168         while (!feof(filep)) {
 169                 readp = &record[records_read];
 170                 records_read += fread(readp, sizeof(struct kvp_record),
 171                                         ENTRIES_PER_BLOCK * num_blocks,
 172                                         filep);
 173
 174                 if (!feof(filep)) {
 175                         /*
 176                          * We have more data to read.
 177                          */
 178                         num_blocks++;
 179                         record = realloc(record, alloc_unit * num_blocks);
 180
 181                         if (record == NULL) {
 182                                 syslog(LOG_ERR, "malloc failed");
 183                                 exit(-1);
 184                         }
 185                         continue;
 186                 }
 187                 break;
 188         }
 189
 190         kvp_file_info[pool].num_blocks = num_blocks;
 191         kvp_file_info[pool].records = record;
 192         kvp_file_info[pool].num_records = records_read;
 193
 194         kvp_release_lock(pool);
 195 }
 196 static int kvp_file_init(void)
 197 {
 198         int ret, fd;
 199         FILE *filep;
 200         size_t records_read;
 201         __u8 *fname;
 202         struct kvp_record *record;
 203         struct kvp_record *readp;
 204         int num_blocks;
 205         int i;
 206         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 207
 208         if (access("/var/opt/hyperv", F_OK)) {
 209                 if (mkdir("/var/opt/hyperv", S_IRUSR | S_IWUSR | S_IROTH)) {
 210                         syslog(LOG_ERR, " Failed to create /var/opt/hyperv");
 211                         exit(-1);
 212                 }
 213         }
 214
 215         for (i = 0; i < KVP_POOL_COUNT; i++) {
 216                 fname = kvp_file_info[i].fname;
 217                 records_read = 0;
 218                 num_blocks = 1;
 219                 sprintf(fname, "/var/opt/hyperv/.kvp_pool_%d", i);
 220                 fd = open(fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IROTH);
 221
 222                 if (fd == -1)
 223                         return 1;
 224
 225
 226                 filep = fopen(fname, "r");
 227                 if (!filep)
 228                         return 1;
 229
 230                 record = malloc(alloc_unit * num_blocks);
 231                 if (record == NULL) {
 232                         fclose(filep);
 233                         return 1;
 234                 }
 235                 while (!feof(filep)) {
 236                         readp = &record[records_read];
 237                         records_read += fread(readp, sizeof(struct kvp_record),
 238                                         ENTRIES_PER_BLOCK,
 239                                         filep);
 240
 241                         if (!feof(filep)) {
 242                                 /*
 243                                  * We have more data to read.
 244                                  */
 245                                 num_blocks++;
 246                                 record = realloc(record, alloc_unit *
 247                                                 num_blocks);
 248                                 if (record == NULL) {
 249                                         fclose(filep);
 250                                         return 1;
 251                                 }
 252                                 continue;
 253                         }
 254                         break;
 255                 }
 256                 kvp_file_info[i].fd = fd;
 257                 kvp_file_info[i].num_blocks = num_blocks;
 258                 kvp_file_info[i].records = record;
 259                 kvp_file_info[i].num_records = records_read;
 260                 fclose(filep);
 261
 262         }
 263
 264         return 0;
 265 }
 266
 267 static int kvp_key_delete(int pool, __u8 *key, int key_size)
 268 {
 269         int i;
 270         int j, k;
 271         int num_records;
 272         struct kvp_record *record;
 273
 274         /*
 275          * First update the in-memory state.
 276          */
 277         kvp_update_mem_state(pool);
 278
 279         num_records = kvp_file_info[pool].num_records;
 280         record = kvp_file_info[pool].records;
 281
 282         for (i = 0; i < num_records; i++) {
 283                 if (memcmp(key, record[i].key, key_size))
 284                         continue;
 285                 /*
 286                  * Found a match; just move the remaining
 287                  * entries up.
 288                  */
 289                 if (i == num_records) {
 290                         kvp_file_info[pool].num_records--;
 291                         kvp_update_file(pool);
 292                         return 0;
 293                 }
 294
 295                 j = i;
 296                 k = j + 1;
 297                 for (; k < num_records; k++) {
 298                         strcpy(record[j].key, record[k].key);
 299                         strcpy(record[j].value, record[k].value);
 300                         j++;
 301                 }
 302
 303                 kvp_file_info[pool].num_records--;
 304                 kvp_update_file(pool);
 305                 return 0;
 306         }
 307         return 1;
 308 }
 309
 310 static int kvp_key_add_or_modify(int pool, __u8 *key, int key_size, __u8 *value,
 311                         int value_size)
 312 {
 313         int i;
 314         int j, k;
 315         int num_records;
 316         struct kvp_record *record;
 317         int num_blocks;
 318
 319         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 320                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 321                 return 1;
 322
 323         /*
 324          * First update the in-memory state.
 325          */
 326         kvp_update_mem_state(pool);
 327
 328         num_records = kvp_file_info[pool].num_records;
 329         record = kvp_file_info[pool].records;
 330         num_blocks = kvp_file_info[pool].num_blocks;
 331
 332         for (i = 0; i < num_records; i++) {
 333                 if (memcmp(key, record[i].key, key_size))
 334                         continue;
 335                 /*
 336                  * Found a match; just update the value -
 337                  * this is the modify case.
 338                  */
 339                 memcpy(record[i].value, value, value_size);
 340                 kvp_update_file(pool);
 341                 return 0;
 342         }
 343
 344         /*
 345          * Need to add a new entry;
 346          */
 347         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 348                 /* Need to allocate a larger array for reg entries. */
 349                 record = realloc(record, sizeof(struct kvp_record) *
 350                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 351
 352                 if (record == NULL)
 353                         return 1;
 354                 kvp_file_info[pool].num_blocks++;
 355
 356         }
 357         memcpy(record[i].value, value, value_size);
 358         memcpy(record[i].key, key, key_size);
 359         kvp_file_info[pool].records = record;
 360         kvp_file_info[pool].num_records++;
 361         kvp_update_file(pool);
 362         return 0;
 363 }
 364
 365 static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
 366                         int value_size)
 367 {
 368         int i;
 369         int num_records;
 370         struct kvp_record *record;
 371
 372         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 373                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 374                 return 1;
 375
 376         /*
 377          * First update the in-memory state.
 378          */
 379         kvp_update_mem_state(pool);
 380
 381         num_records = kvp_file_info[pool].num_records;
 382         record = kvp_file_info[pool].records;
 383
 384         for (i = 0; i < num_records; i++) {
 385                 if (memcmp(key, record[i].key, key_size))
 386                         continue;
 387                 /*
 388                  * Found a match; just copy the value out.
 389                  */
 390                 memcpy(value, record[i].value, value_size);
 391                 return 0;
 392         }
 393
 394         return 1;
 395 }
 396
 397 static void kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
 398                                 __u8 *value, int value_size)
 399 {
 400         struct kvp_record *record;
 401
 402         /*
 403          * First update our in-memory database.
 404          */
 405         kvp_update_mem_state(pool);
 406         record = kvp_file_info[pool].records;
 407
 408         if (index >= kvp_file_info[pool].num_records) {
 409                 /*
 410                  * This is an invalid index; terminate enumeration;
 411                  * - a NULL value will do the trick.
 412                  */
 413                 strcpy(value, "");
 414                 return;
 415         }
 416
 417         memcpy(key, record[index].key, key_size);
 418         memcpy(value, record[index].value, value_size);
 419 }
 420
 421
 422 void kvp_get_os_info(void)
 423 {
 424         FILE    *file;
 425         char    *p, buf[512];
 426
 427         uname(&uts_buf);
 428         os_build = uts_buf.release;
 429         processor_arch = uts_buf.machine;
 430
 431         /*
 432          * The current windows host (win7) expects the build
 433          * string to be of the form: x.y.z
 434          * Strip additional information we may have.
 435          */
 436         p = strchr(os_build, '-');
 437         if (p)
 438                 *p = '\0';
 439
 440         file = fopen("/etc/SuSE-release", "r");
 441         if (file != NULL)
 442                 goto kvp_osinfo_found;
 443         file  = fopen("/etc/redhat-release", "r");
 444         if (file != NULL)
 445                 goto kvp_osinfo_found;
 446         /*
 447          * Add code for other supported platforms.
 448          */
 449
 450         /*
 451          * We don't have information about the os.
 452          */
 453         os_name = uts_buf.sysname;
 454         return;
 455
 456 kvp_osinfo_found:
 457         /* up to three lines */
 458         p = fgets(buf, sizeof(buf), file);
 459         if (p) {
 460                 p = strchr(buf, '\n');
 461                 if (p)
 462                         *p = '\0';
 463                 p = strdup(buf);
 464                 if (!p)
 465                         goto done;
 466                 os_name = p;
 467
 468                 /* second line */
 469                 p = fgets(buf, sizeof(buf), file);
 470                 if (p) {
 471                         p = strchr(buf, '\n');
 472                         if (p)
 473                                 *p = '\0';
 474                         p = strdup(buf);
 475                         if (!p)
 476                                 goto done;
 477                         os_major = p;
 478
 479                         /* third line */
 480                         p = fgets(buf, sizeof(buf), file);
 481                         if (p)  {
 482                                 p = strchr(buf, '\n');
 483                                 if (p)
 484                                         *p = '\0';
 485                                 p = strdup(buf);
 486                                 if (p)
 487                                         os_minor = p;
 488                         }
 489                 }
 490         }
 491
 492 done:
 493         fclose(file);
 494         return;
 495 }
 496
 497 static int
 498 kvp_get_ip_address(int family, char *buffer, int length)
 499 {
 500         struct ifaddrs *ifap;
 501         struct ifaddrs *curp;
 502         int ipv4_len = strlen("255.255.255.255") + 1;
 503         int ipv6_len = strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
 504         int offset = 0;
 505         const char *str;
 506         char tmp[50];
 507         int error = 0;
 508
 509         /*
 510          * On entry into this function, the buffer is capable of holding the
 511          * maximum key value (2048 bytes).
 512          */
 513
 514         if (getifaddrs(&ifap)) {
 515                 strcpy(buffer, "getifaddrs failed\n");
 516                 return 1;
 517         }
 518
 519         curp = ifap;
 520         while (curp != NULL) {
 521                 if ((curp->ifa_addr != NULL) &&
 522                    (curp->ifa_addr->sa_family == family)) {
 523                         if (family == AF_INET) {
 524                                 struct sockaddr_in *addr =
 525                                 (struct sockaddr_in *) curp->ifa_addr;
 526
 527                                 str = inet_ntop(family, &addr->sin_addr,
 528                                                 tmp, 50);
 529                                 if (str == NULL) {
 530                                         strcpy(buffer, "inet_ntop failed\n");
 531                                         error = 1;
 532                                         goto getaddr_done;
 533                                 }
 534                                 if (offset == 0)
 535                                         strcpy(buffer, tmp);
 536                                 else
 537                                         strcat(buffer, tmp);
 538                                 strcat(buffer, ";");
 539
 540                                 offset += strlen(str) + 1;
 541                                 if ((length - offset) < (ipv4_len + 1))
 542                                         goto getaddr_done;
 543
 544                         } else {
 545
 546                         /*
 547                          * We only support AF_INET and AF_INET6
 548                          * and the list of addresses is separated by a ";".
 549                          */
 550                                 struct sockaddr_in6 *addr =
 551                                 (struct sockaddr_in6 *) curp->ifa_addr;
 552
 553                                 str = inet_ntop(family,
 554                                         &addr->sin6_addr.s6_addr,
 555                                         tmp, 50);
 556                                 if (str == NULL) {
 557                                         strcpy(buffer, "inet_ntop failed\n");
 558                                         error = 1;
 559                                         goto getaddr_done;
 560                                 }
 561                                 if (offset == 0)
 562                                         strcpy(buffer, tmp);
 563                                 else
 564                                         strcat(buffer, tmp);
 565                                 strcat(buffer, ";");
 566                                 offset += strlen(str) + 1;
 567                                 if ((length - offset) < (ipv6_len + 1))
 568                                         goto getaddr_done;
 569
 570                         }
 571
 572                 }
 573                 curp = curp->ifa_next;
 574         }
 575
 576 getaddr_done:
 577         freeifaddrs(ifap);
 578         return error;
 579 }
 580
 581
 582 static int
 583 kvp_get_domain_name(char *buffer, int length)
 584 {
 585         struct addrinfo hints, *info ;
 586         int error = 0;
 587
 588         gethostname(buffer, length);
 589         memset(&hints, 0, sizeof(hints));
 590         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
 591         hints.ai_socktype = SOCK_STREAM;
 592         hints.ai_flags = AI_CANONNAME;
 593
 594         error = getaddrinfo(buffer, NULL, &hints, &info);
 595         if (error != 0) {
 596                 strcpy(buffer, "getaddrinfo failed\n");
 597                 return error;
 598         }
 599         strcpy(buffer, info->ai_canonname);
 600         freeaddrinfo(info);
 601         return error;
 602 }
 603
 604 static int
 605 netlink_send(int fd, struct cn_msg *msg)
 606 {
 607         struct nlmsghdr *nlh;
 608         unsigned int size;
 609         struct msghdr message;
 610         char buffer[64];
 611         struct iovec iov[2];
 612
 613         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
 614
 615         nlh = (struct nlmsghdr *)buffer;
 616         nlh->nlmsg_seq = 0;
 617         nlh->nlmsg_pid = getpid();
 618         nlh->nlmsg_type = NLMSG_DONE;
 619         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
 620         nlh->nlmsg_flags = 0;
 621
 622         iov[0].iov_base = nlh;
 623         iov[0].iov_len = sizeof(*nlh);
 624
 625         iov[1].iov_base = msg;
 626         iov[1].iov_len = size;
 627
 628         memset(&message, 0, sizeof(message));
 629         message.msg_name = &addr;
 630         message.msg_namelen = sizeof(addr);
 631         message.msg_iov = iov;
 632         message.msg_iovlen = 2;
 633
 634         return sendmsg(fd, &message, 0);
 635 }
 636
 637 int main(void)
 638 {
 639         int fd, len, sock_opt;
 640         int error;
 641         struct cn_msg *message;
 642         struct pollfd pfd;
 643         struct nlmsghdr *incoming_msg;
 644         struct cn_msg   *incoming_cn_msg;
 645         struct hv_kvp_msg *hv_msg;
 646         char    *p;
 647         char    *key_value;
 648         char    *key_name;
 649
 650         daemon(1, 0);
 651         openlog("KVP", 0, LOG_USER);
 652         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 653         /*
 654          * Retrieve OS release information.
 655          */
 656         kvp_get_os_info();
 657
 658         if (kvp_file_init()) {
 659                 syslog(LOG_ERR, "Failed to initialize the pools");
 660                 exit(-1);
 661         }
 662
 663         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 664         if (fd < 0) {
 665                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
 666                 exit(-1);
 667         }
 668         addr.nl_family = AF_NETLINK;
 669         addr.nl_pad = 0;
 670         addr.nl_pid = 0;
 671         addr.nl_groups = CN_KVP_IDX;
 672
 673
 674         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
 675         if (error < 0) {
 676                 syslog(LOG_ERR, "bind failed; error:%d", error);
 677                 close(fd);
 678                 exit(-1);
 679         }
 680         sock_opt = addr.nl_groups;
 681         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
 682         /*
 683          * Register ourselves with the kernel.
 684          */
 685         message = (struct cn_msg *)kvp_send_buffer;
 686         message->id.idx = CN_KVP_IDX;
 687         message->id.val = CN_KVP_VAL;
 688
 689         hv_msg = (struct hv_kvp_msg *)message->data;
 690         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER;
 691         message->ack = 0;
 692         message->len = sizeof(struct hv_kvp_msg);
 693
 694         len = netlink_send(fd, message);
 695         if (len < 0) {
 696                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
 697                 close(fd);
 698                 exit(-1);
 699         }
 700
 701         pfd.fd = fd;
 702
 703         while (1) {
 704                 pfd.events = POLLIN;
 705                 pfd.revents = 0;
 706                 poll(&pfd, 1, -1);
 707
 708                 len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
 709
 710                 if (len < 0) {
 711                         syslog(LOG_ERR, "recv failed; error:%d", len);
 712                         close(fd);
 713                         return -1;
 714                 }
 715
 716                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
 717                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
 718                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 719
 720                 switch (hv_msg->kvp_hdr.operation) {
 721                 case KVP_OP_REGISTER:
 722                         /*
 723                          * Driver is registering with us; stash away the version
 724                          * information.
 725                          */
 726                         p = (char *)hv_msg->body.kvp_register.version;
 727                         lic_version = malloc(strlen(p) + 1);
 728                         if (lic_version) {
 729                                 strcpy(lic_version, p);
 730                                 syslog(LOG_INFO, "KVP LIC Version: %s",
 731                                         lic_version);
 732                         } else {
 733                                 syslog(LOG_ERR, "malloc failed");
 734                         }
 735                         continue;
 736
 737                 /*
 738                  * The current protocol with the kernel component uses a
 739                  * NULL key name to pass an error condition.
 740                  * For the SET, GET and DELETE operations,
 741                  * use the existing protocol to pass back error.
 742                  */
 743
 744                 case KVP_OP_SET:
 745                         if (kvp_key_add_or_modify(hv_msg->kvp_hdr.pool,
 746                                         hv_msg->body.kvp_set.data.key,
 747                                         hv_msg->body.kvp_set.data.key_size,
 748                                         hv_msg->body.kvp_set.data.value,
 749                                         hv_msg->body.kvp_set.data.value_size))
 750                                 strcpy(hv_msg->body.kvp_set.data.key, "");
 751                         break;
 752
 753                 case KVP_OP_GET:
 754                         if (kvp_get_value(hv_msg->kvp_hdr.pool,
 755                                         hv_msg->body.kvp_set.data.key,
 756                                         hv_msg->body.kvp_set.data.key_size,
 757                                         hv_msg->body.kvp_set.data.value,
 758                                         hv_msg->body.kvp_set.data.value_size))
 759                                 strcpy(hv_msg->body.kvp_set.data.key, "");
 760                         break;
 761
 762                 case KVP_OP_DELETE:
 763                         if (kvp_key_delete(hv_msg->kvp_hdr.pool,
 764                                         hv_msg->body.kvp_delete.key,
 765                                         hv_msg->body.kvp_delete.key_size))
 766                                 strcpy(hv_msg->body.kvp_delete.key, "");
 767                         break;
 768
 769                 default:
 770                         break;
 771                 }
 772
 773                 if (hv_msg->kvp_hdr.operation != KVP_OP_ENUMERATE)
 774                         goto kvp_done;
 775
 776                 /*
 777                  * If the pool is KVP_POOL_AUTO, dynamically generate
 778                  * both the key and the value; if not read from the
 779                  * appropriate pool.
 780                  */
 781                 if (hv_msg->kvp_hdr.pool != KVP_POOL_AUTO) {
 782                         kvp_pool_enumerate(hv_msg->kvp_hdr.pool,
 783                                         hv_msg->body.kvp_enum_data.index,
 784                                         hv_msg->body.kvp_enum_data.data.key,
 785                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
 786                                         hv_msg->body.kvp_enum_data.data.value,
 787                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 788                         goto kvp_done;
 789                 }
 790
 791                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 792                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
 793                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
 794
 795                 switch (hv_msg->body.kvp_enum_data.index) {
 796                 case FullyQualifiedDomainName:
 797                         kvp_get_domain_name(key_value,
 798                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 799                         strcpy(key_name, "FullyQualifiedDomainName");
 800                         break;
 801                 case IntegrationServicesVersion:
 802                         strcpy(key_name, "IntegrationServicesVersion");
 803                         strcpy(key_value, lic_version);
 804                         break;
 805                 case NetworkAddressIPv4:
 806                         kvp_get_ip_address(AF_INET, key_value,
 807                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 808                         strcpy(key_name, "NetworkAddressIPv4");
 809                         break;
 810                 case NetworkAddressIPv6:
 811                         kvp_get_ip_address(AF_INET6, key_value,
 812                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 813                         strcpy(key_name, "NetworkAddressIPv6");
 814                         break;
 815                 case OSBuildNumber:
 816                         strcpy(key_value, os_build);
 817                         strcpy(key_name, "OSBuildNumber");
 818                         break;
 819                 case OSName:
 820                         strcpy(key_value, os_name);
 821                         strcpy(key_name, "OSName");
 822                         break;
 823                 case OSMajorVersion:
 824                         strcpy(key_value, os_major);
 825                         strcpy(key_name, "OSMajorVersion");
 826                         break;
 827                 case OSMinorVersion:
 828                         strcpy(key_value, os_minor);
 829                         strcpy(key_name, "OSMinorVersion");
 830                         break;
 831                 case OSVersion:
 832                         strcpy(key_value, os_build);
 833                         strcpy(key_name, "OSVersion");
 834                         break;
 835                 case ProcessorArchitecture:
 836                         strcpy(key_value, processor_arch);
 837                         strcpy(key_name, "ProcessorArchitecture");
 838                         break;
 839                 default:
 840                         strcpy(key_value, "Unknown Key");
 841                         /*
 842                          * We use a null key name to terminate enumeration.
 843                          */
 844                         strcpy(key_name, "");
 845                         break;
 846                 }
 847                 /*
 848                  * Send the value back to the kernel. The response is
 849                  * already in the receive buffer. Update the cn_msg header to
 850                  * reflect the key value that has been added to the message
 851                  */
 852 kvp_done:
 853
 854                 incoming_cn_msg->id.idx = CN_KVP_IDX;
 855                 incoming_cn_msg->id.val = CN_KVP_VAL;
 856                 incoming_cn_msg->ack = 0;
 857                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
 858
 859                 len = netlink_send(fd, incoming_cn_msg);
 860                 if (len < 0) {
 861                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
 862                         exit(-1);
 863                 }
 864         }
 865
 866 }