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 unsigned int hweight32(unsigned int *w)
 495 {
 496         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 497         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 498         res = (res + (res >> 4)) & 0x0F0F0F0F;
 499         res = res + (res >> 8);
 500         return (res + (res >> 16)) & 0x000000FF;
 501 }
 502
 503 static int kvp_process_ip_address(void *addrp,
 504                                 int family, char *buffer,
 505                                 int length,  int *offset)
 506 {
 507         struct sockaddr_in *addr;
 508         struct sockaddr_in6 *addr6;
 509         int addr_length;
 510         char tmp[50];
 511         const char *str;
 512
 513         if (family == AF_INET) {
 514                 addr = (struct sockaddr_in *)addrp;
 515                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 516                 addr_length = INET_ADDRSTRLEN;
 517         } else {
 518                 addr6 = (struct sockaddr_in6 *)addrp;
 519                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 520                 addr_length = INET6_ADDRSTRLEN;
 521         }
 522
 523         if ((length - *offset) < addr_length + 1)
 524                 return 1;
 525         if (str == NULL) {
 526                 strcpy(buffer, "inet_ntop failed\n");
 527                 return 1;
 528         }
 529         if (*offset == 0)
 530                 strcpy(buffer, tmp);
 531         else
 532                 strcat(buffer, tmp);
 533         strcat(buffer, ";");
 534
 535         *offset += strlen(str) + 1;
 536         return 0;
 537 }
 538
 539 static int
 540 kvp_get_ip_address(int family, char *if_name, int op,
 541                  void  *out_buffer, int length)
 542 {
 543         struct ifaddrs *ifap;
 544         struct ifaddrs *curp;
 545         int offset = 0;
 546         int sn_offset = 0;
 547         int error = 0;
 548         char *buffer;
 549         struct hv_kvp_ipaddr_value *ip_buffer;
 550         char cidr_mask[5]; /* /xyz */
 551         int weight;
 552         int i;
 553         unsigned int *w;
 554         char *sn_str;
 555         struct sockaddr_in6 *addr6;
 556
 557         if (op == KVP_OP_ENUMERATE) {
 558                 buffer = out_buffer;
 559         } else {
 560                 ip_buffer = out_buffer;
 561                 buffer = (char *)ip_buffer->ip_addr;
 562                 ip_buffer->addr_family = 0;
 563         }
 564         /*
 565          * On entry into this function, the buffer is capable of holding the
 566          * maximum key value.
 567          */
 568
 569         if (getifaddrs(&ifap)) {
 570                 strcpy(buffer, "getifaddrs failed\n");
 571                 return 1;
 572         }
 573
 574         curp = ifap;
 575         while (curp != NULL) {
 576                 if (curp->ifa_addr == NULL) {
 577                         curp = curp->ifa_next;
 578                         continue;
 579                 }
 580
 581                 if ((if_name != NULL) &&
 582                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 583                         /*
 584                          * We want info about a specific interface;
 585                          * just continue.
 586                          */
 587                         curp = curp->ifa_next;
 588                         continue;
 589                 }
 590
 591                 /*
 592                  * We only support two address families: AF_INET and AF_INET6.
 593                  * If a family value of 0 is specified, we collect both
 594                  * supported address families; if not we gather info on
 595                  * the specified address family.
 596                  */
 597                 if ((family != 0) && (curp->ifa_addr->sa_family != family)) {
 598                         curp = curp->ifa_next;
 599                         continue;
 600                 }
 601                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 602                         (curp->ifa_addr->sa_family != AF_INET6)) {
 603                         curp = curp->ifa_next;
 604                         continue;
 605                 }
 606
 607                 if (op == KVP_OP_GET_IP_INFO) {
 608                         /*
 609                          * Gather info other than the IP address.
 610                          * IP address info will be gathered later.
 611                          */
 612                         if (curp->ifa_addr->sa_family == AF_INET) {
 613                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 614                                 /*
 615                                  * Get subnet info.
 616                                  */
 617                                 error = kvp_process_ip_address(
 618                                                              curp->ifa_netmask,
 619                                                              AF_INET,
 620                                                              (char *)
 621                                                              ip_buffer->sub_net,
 622                                                              length,
 623                                                              &sn_offset);
 624                                 if (error)
 625                                         goto gather_ipaddr;
 626                         } else {
 627                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 628
 629                                 /*
 630                                  * Get subnet info in CIDR format.
 631                                  */
 632                                 weight = 0;
 633                                 sn_str = (char *)ip_buffer->sub_net;
 634                                 addr6 = (struct sockaddr_in6 *)
 635                                         curp->ifa_netmask;
 636                                 w = addr6->sin6_addr.s6_addr32;
 637
 638                                 for (i = 0; i < 4; i++)
 639                                         weight += hweight32(&w[i]);
 640
 641                                 sprintf(cidr_mask, "/%d", weight);
 642                                 if ((length - sn_offset) <
 643                                         (strlen(cidr_mask) + 1))
 644                                         goto gather_ipaddr;
 645
 646                                 if (sn_offset == 0)
 647                                         strcpy(sn_str, cidr_mask);
 648                                 else
 649                                         strcat(sn_str, cidr_mask);
 650                                 strcat((char *)ip_buffer->sub_net, ";");
 651                                 sn_offset += strlen(sn_str) + 1;
 652                         }
 653                 }
 654
 655 gather_ipaddr:
 656                 error = kvp_process_ip_address(curp->ifa_addr,
 657                                                 curp->ifa_addr->sa_family,
 658                                                 buffer,
 659                                                 length, &offset);
 660                 if (error)
 661                         goto getaddr_done;
 662
 663                 curp = curp->ifa_next;
 664         }
 665
 666 getaddr_done:
 667         freeifaddrs(ifap);
 668         return error;
 669 }
 670
 671
 672 static int
 673 kvp_get_domain_name(char *buffer, int length)
 674 {
 675         struct addrinfo hints, *info ;
 676         int error = 0;
 677
 678         gethostname(buffer, length);
 679         memset(&hints, 0, sizeof(hints));
 680         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
 681         hints.ai_socktype = SOCK_STREAM;
 682         hints.ai_flags = AI_CANONNAME;
 683
 684         error = getaddrinfo(buffer, NULL, &hints, &info);
 685         if (error != 0) {
 686                 strcpy(buffer, "getaddrinfo failed\n");
 687                 return error;
 688         }
 689         strcpy(buffer, info->ai_canonname);
 690         freeaddrinfo(info);
 691         return error;
 692 }
 693
 694 static int
 695 netlink_send(int fd, struct cn_msg *msg)
 696 {
 697         struct nlmsghdr *nlh;
 698         unsigned int size;
 699         struct msghdr message;
 700         char buffer[64];
 701         struct iovec iov[2];
 702
 703         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
 704
 705         nlh = (struct nlmsghdr *)buffer;
 706         nlh->nlmsg_seq = 0;
 707         nlh->nlmsg_pid = getpid();
 708         nlh->nlmsg_type = NLMSG_DONE;
 709         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
 710         nlh->nlmsg_flags = 0;
 711
 712         iov[0].iov_base = nlh;
 713         iov[0].iov_len = sizeof(*nlh);
 714
 715         iov[1].iov_base = msg;
 716         iov[1].iov_len = size;
 717
 718         memset(&message, 0, sizeof(message));
 719         message.msg_name = &addr;
 720         message.msg_namelen = sizeof(addr);
 721         message.msg_iov = iov;
 722         message.msg_iovlen = 2;
 723
 724         return sendmsg(fd, &message, 0);
 725 }
 726
 727 int main(void)
 728 {
 729         int fd, len, sock_opt;
 730         int error;
 731         struct cn_msg *message;
 732         struct pollfd pfd;
 733         struct nlmsghdr *incoming_msg;
 734         struct cn_msg   *incoming_cn_msg;
 735         struct hv_kvp_msg *hv_msg;
 736         char    *p;
 737         char    *key_value;
 738         char    *key_name;
 739         int     op;
 740         int     pool;
 741
 742         daemon(1, 0);
 743         openlog("KVP", 0, LOG_USER);
 744         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 745         /*
 746          * Retrieve OS release information.
 747          */
 748         kvp_get_os_info();
 749
 750         if (kvp_file_init()) {
 751                 syslog(LOG_ERR, "Failed to initialize the pools");
 752                 exit(-1);
 753         }
 754
 755         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 756         if (fd < 0) {
 757                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
 758                 exit(-1);
 759         }
 760         addr.nl_family = AF_NETLINK;
 761         addr.nl_pad = 0;
 762         addr.nl_pid = 0;
 763         addr.nl_groups = CN_KVP_IDX;
 764
 765
 766         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
 767         if (error < 0) {
 768                 syslog(LOG_ERR, "bind failed; error:%d", error);
 769                 close(fd);
 770                 exit(-1);
 771         }
 772         sock_opt = addr.nl_groups;
 773         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
 774         /*
 775          * Register ourselves with the kernel.
 776          */
 777         message = (struct cn_msg *)kvp_send_buffer;
 778         message->id.idx = CN_KVP_IDX;
 779         message->id.val = CN_KVP_VAL;
 780
 781         hv_msg = (struct hv_kvp_msg *)message->data;
 782         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
 783         message->ack = 0;
 784         message->len = sizeof(struct hv_kvp_msg);
 785
 786         len = netlink_send(fd, message);
 787         if (len < 0) {
 788                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
 789                 close(fd);
 790                 exit(-1);
 791         }
 792
 793         pfd.fd = fd;
 794
 795         while (1) {
 796                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
 797                 socklen_t addr_l = sizeof(addr);
 798                 pfd.events = POLLIN;
 799                 pfd.revents = 0;
 800                 poll(&pfd, 1, -1);
 801
 802                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
 803                                 addr_p, &addr_l);
 804
 805                 if (len < 0 || addr.nl_pid) {
 806                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
 807                                         addr.nl_pid, errno, strerror(errno));
 808                         close(fd);
 809                         return -1;
 810                 }
 811
 812                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
 813                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
 814                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 815
 816                 /*
 817                  * We will use the KVP header information to pass back
 818                  * the error from this daemon. So, first copy the state
 819                  * and set the error code to success.
 820                  */
 821                 op = hv_msg->kvp_hdr.operation;
 822                 pool = hv_msg->kvp_hdr.pool;
 823                 hv_msg->error = HV_S_OK;
 824
 825                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
 826                         /*
 827                          * Driver is registering with us; stash away the version
 828                          * information.
 829                          */
 830                         in_hand_shake = 0;
 831                         p = (char *)hv_msg->body.kvp_register.version;
 832                         lic_version = malloc(strlen(p) + 1);
 833                         if (lic_version) {
 834                                 strcpy(lic_version, p);
 835                                 syslog(LOG_INFO, "KVP LIC Version: %s",
 836                                         lic_version);
 837                         } else {
 838                                 syslog(LOG_ERR, "malloc failed");
 839                         }
 840                         continue;
 841                 }
 842
 843                 switch (op) {
 844                 case KVP_OP_SET:
 845                         if (kvp_key_add_or_modify(pool,
 846                                         hv_msg->body.kvp_set.data.key,
 847                                         hv_msg->body.kvp_set.data.key_size,
 848                                         hv_msg->body.kvp_set.data.value,
 849                                         hv_msg->body.kvp_set.data.value_size))
 850                                         hv_msg->error = HV_S_CONT;
 851                         break;
 852
 853                 case KVP_OP_GET:
 854                         if (kvp_get_value(pool,
 855                                         hv_msg->body.kvp_set.data.key,
 856                                         hv_msg->body.kvp_set.data.key_size,
 857                                         hv_msg->body.kvp_set.data.value,
 858                                         hv_msg->body.kvp_set.data.value_size))
 859                                         hv_msg->error = HV_S_CONT;
 860                         break;
 861
 862                 case KVP_OP_DELETE:
 863                         if (kvp_key_delete(pool,
 864                                         hv_msg->body.kvp_delete.key,
 865                                         hv_msg->body.kvp_delete.key_size))
 866                                         hv_msg->error = HV_S_CONT;
 867                         break;
 868
 869                 default:
 870                         break;
 871                 }
 872
 873                 if (op != KVP_OP_ENUMERATE)
 874                         goto kvp_done;
 875
 876                 /*
 877                  * If the pool is KVP_POOL_AUTO, dynamically generate
 878                  * both the key and the value; if not read from the
 879                  * appropriate pool.
 880                  */
 881                 if (pool != KVP_POOL_AUTO) {
 882                         if (kvp_pool_enumerate(pool,
 883                                         hv_msg->body.kvp_enum_data.index,
 884                                         hv_msg->body.kvp_enum_data.data.key,
 885                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
 886                                         hv_msg->body.kvp_enum_data.data.value,
 887                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 888                                         hv_msg->error = HV_S_CONT;
 889                         goto kvp_done;
 890                 }
 891
 892                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
 893                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
 894                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
 895
 896                 switch (hv_msg->body.kvp_enum_data.index) {
 897                 case FullyQualifiedDomainName:
 898                         kvp_get_domain_name(key_value,
 899                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 900                         strcpy(key_name, "FullyQualifiedDomainName");
 901                         break;
 902                 case IntegrationServicesVersion:
 903                         strcpy(key_name, "IntegrationServicesVersion");
 904                         strcpy(key_value, lic_version);
 905                         break;
 906                 case NetworkAddressIPv4:
 907                         kvp_get_ip_address(AF_INET, NULL, KVP_OP_ENUMERATE,
 908                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 909                         strcpy(key_name, "NetworkAddressIPv4");
 910                         break;
 911                 case NetworkAddressIPv6:
 912                         kvp_get_ip_address(AF_INET6, NULL, KVP_OP_ENUMERATE,
 913                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 914                         strcpy(key_name, "NetworkAddressIPv6");
 915                         break;
 916                 case OSBuildNumber:
 917                         strcpy(key_value, os_build);
 918                         strcpy(key_name, "OSBuildNumber");
 919                         break;
 920                 case OSName:
 921                         strcpy(key_value, os_name);
 922                         strcpy(key_name, "OSName");
 923                         break;
 924                 case OSMajorVersion:
 925                         strcpy(key_value, os_major);
 926                         strcpy(key_name, "OSMajorVersion");
 927                         break;
 928                 case OSMinorVersion:
 929                         strcpy(key_value, os_minor);
 930                         strcpy(key_name, "OSMinorVersion");
 931                         break;
 932                 case OSVersion:
 933                         strcpy(key_value, os_build);
 934                         strcpy(key_name, "OSVersion");
 935                         break;
 936                 case ProcessorArchitecture:
 937                         strcpy(key_value, processor_arch);
 938                         strcpy(key_name, "ProcessorArchitecture");
 939                         break;
 940                 default:
 941                         hv_msg->error = HV_S_CONT;
 942                         break;
 943                 }
 944                 /*
 945                  * Send the value back to the kernel. The response is
 946                  * already in the receive buffer. Update the cn_msg header to
 947                  * reflect the key value that has been added to the message
 948                  */
 949 kvp_done:
 950
 951                 incoming_cn_msg->id.idx = CN_KVP_IDX;
 952                 incoming_cn_msg->id.val = CN_KVP_VAL;
 953                 incoming_cn_msg->ack = 0;
 954                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
 955
 956                 len = netlink_send(fd, incoming_cn_msg);
 957                 if (len < 0) {
 958                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
 959                         exit(-1);
 960                 }
 961         }
 962
 963 }