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 <ctype.h>
  35 #include <errno.h>
  36 #include <arpa/inet.h>
  37 #include <linux/connector.h>
  38 #include <linux/hyperv.h>
  39 #include <linux/netlink.h>
  40 #include <ifaddrs.h>
  41 #include <netdb.h>
  42 #include <syslog.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45 #include <dirent.h>
  46 #include <net/if.h>
  47
  48 /*
  49  * KVP protocol: The user mode component first registers with the
  50  * the kernel component. Subsequently, the kernel component requests, data
  51  * for the specified keys. In response to this message the user mode component
  52  * fills in the value corresponding to the specified key. We overload the
  53  * sequence field in the cn_msg header to define our KVP message types.
  54  *
  55  * We use this infrastructure for also supporting queries from user mode
  56  * application for state that may be maintained in the KVP kernel component.
  57  *
  58  */
  59
  60
  61 enum key_index {
  62         FullyQualifiedDomainName = 0,
  63         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  64         NetworkAddressIPv4,
  65         NetworkAddressIPv6,
  66         OSBuildNumber,
  67         OSName,
  68         OSMajorVersion,
  69         OSMinorVersion,
  70         OSVersion,
  71         ProcessorArchitecture
  72 };
  73
  74
  75 enum {
  76         IPADDR = 0,
  77         NETMASK,
  78         GATEWAY,
  79         DNS
  80 };
  81
  82 static char kvp_send_buffer[4096];
  83 static char kvp_recv_buffer[4096 * 2];
  84 static struct sockaddr_nl addr;
  85 static int in_hand_shake = 1;
  86
  87 static char *os_name = "";
  88 static char *os_major = "";
  89 static char *os_minor = "";
  90 static char *processor_arch;
  91 static char *os_build;
  92 static char *os_version;
  93 static char *lic_version = "Unknown version";
  94 static struct utsname uts_buf;
  95
  96 /*
  97  * The location of the interface configuration file.
  98  */
  99
 100 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 101
 102 #define MAX_FILE_NAME 100
 103 #define ENTRIES_PER_BLOCK 50
 104
 105 struct kvp_record {
 106         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 107         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 108 };
 109
 110 struct kvp_file_state {
 111         int fd;
 112         int num_blocks;
 113         struct kvp_record *records;
 114         int num_records;
 115         char fname[MAX_FILE_NAME];
 116 };
 117
 118 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 119
 120 static void kvp_acquire_lock(int pool)
 121 {
 122         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 123         fl.l_pid = getpid();
 124
 125         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 126                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
 127                 exit(EXIT_FAILURE);
 128         }
 129 }
 130
 131 static void kvp_release_lock(int pool)
 132 {
 133         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 134         fl.l_pid = getpid();
 135
 136         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 137                 perror("fcntl");
 138                 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
 139                 exit(EXIT_FAILURE);
 140         }
 141 }
 142
 143 static void kvp_update_file(int pool)
 144 {
 145         FILE *filep;
 146         size_t bytes_written;
 147
 148         /*
 149          * We are going to write our in-memory registry out to
 150          * disk; acquire the lock first.
 151          */
 152         kvp_acquire_lock(pool);
 153
 154         filep = fopen(kvp_file_info[pool].fname, "we");
 155         if (!filep) {
 156                 kvp_release_lock(pool);
 157                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 158                 exit(EXIT_FAILURE);
 159         }
 160
 161         bytes_written = fwrite(kvp_file_info[pool].records,
 162                                 sizeof(struct kvp_record),
 163                                 kvp_file_info[pool].num_records, filep);
 164
 165         if (ferror(filep) || fclose(filep)) {
 166                 kvp_release_lock(pool);
 167                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 168                 exit(EXIT_FAILURE);
 169         }
 170
 171         kvp_release_lock(pool);
 172 }
 173
 174 static void kvp_update_mem_state(int pool)
 175 {
 176         FILE *filep;
 177         size_t records_read = 0;
 178         struct kvp_record *record = kvp_file_info[pool].records;
 179         struct kvp_record *readp;
 180         int num_blocks = kvp_file_info[pool].num_blocks;
 181         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 182
 183         kvp_acquire_lock(pool);
 184
 185         filep = fopen(kvp_file_info[pool].fname, "re");
 186         if (!filep) {
 187                 kvp_release_lock(pool);
 188                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 189                 exit(EXIT_FAILURE);
 190         }
 191         for (;;) {
 192                 readp = &record[records_read];
 193                 records_read += fread(readp, sizeof(struct kvp_record),
 194                                         ENTRIES_PER_BLOCK * num_blocks,
 195                                         filep);
 196
 197                 if (ferror(filep)) {
 198                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
 199                         exit(EXIT_FAILURE);
 200                 }
 201
 202                 if (!feof(filep)) {
 203                         /*
 204                          * We have more data to read.
 205                          */
 206                         num_blocks++;
 207                         record = realloc(record, alloc_unit * num_blocks);
 208
 209                         if (record == NULL) {
 210                                 syslog(LOG_ERR, "malloc failed");
 211                                 exit(EXIT_FAILURE);
 212                         }
 213                         continue;
 214                 }
 215                 break;
 216         }
 217
 218         kvp_file_info[pool].num_blocks = num_blocks;
 219         kvp_file_info[pool].records = record;
 220         kvp_file_info[pool].num_records = records_read;
 221
 222         fclose(filep);
 223         kvp_release_lock(pool);
 224 }
 225 static int kvp_file_init(void)
 226 {
 227         int  fd;
 228         FILE *filep;
 229         size_t records_read;
 230         char *fname;
 231         struct kvp_record *record;
 232         struct kvp_record *readp;
 233         int num_blocks;
 234         int i;
 235         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 236
 237         if (access(KVP_CONFIG_LOC, F_OK)) {
 238                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 239                         syslog(LOG_ERR, " Failed to create %s", KVP_CONFIG_LOC);
 240                         exit(EXIT_FAILURE);
 241                 }
 242         }
 243
 244         for (i = 0; i < KVP_POOL_COUNT; i++) {
 245                 fname = kvp_file_info[i].fname;
 246                 records_read = 0;
 247                 num_blocks = 1;
 248                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 249                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 250
 251                 if (fd == -1)
 252                         return 1;
 253
 254
 255                 filep = fopen(fname, "re");
 256                 if (!filep)
 257                         return 1;
 258
 259                 record = malloc(alloc_unit * num_blocks);
 260                 if (record == NULL) {
 261                         fclose(filep);
 262                         return 1;
 263                 }
 264                 for (;;) {
 265                         readp = &record[records_read];
 266                         records_read += fread(readp, sizeof(struct kvp_record),
 267                                         ENTRIES_PER_BLOCK,
 268                                         filep);
 269
 270                         if (ferror(filep)) {
 271                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 272                                        i);
 273                                 exit(EXIT_FAILURE);
 274                         }
 275
 276                         if (!feof(filep)) {
 277                                 /*
 278                                  * We have more data to read.
 279                                  */
 280                                 num_blocks++;
 281                                 record = realloc(record, alloc_unit *
 282                                                 num_blocks);
 283                                 if (record == NULL) {
 284                                         fclose(filep);
 285                                         return 1;
 286                                 }
 287                                 continue;
 288                         }
 289                         break;
 290                 }
 291                 kvp_file_info[i].fd = fd;
 292                 kvp_file_info[i].num_blocks = num_blocks;
 293                 kvp_file_info[i].records = record;
 294                 kvp_file_info[i].num_records = records_read;
 295                 fclose(filep);
 296
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int kvp_key_delete(int pool, const char *key, int key_size)
 303 {
 304         int i;
 305         int j, k;
 306         int num_records;
 307         struct kvp_record *record;
 308
 309         /*
 310          * First update the in-memory state.
 311          */
 312         kvp_update_mem_state(pool);
 313
 314         num_records = kvp_file_info[pool].num_records;
 315         record = kvp_file_info[pool].records;
 316
 317         for (i = 0; i < num_records; i++) {
 318                 if (memcmp(key, record[i].key, key_size))
 319                         continue;
 320                 /*
 321                  * Found a match; just move the remaining
 322                  * entries up.
 323                  */
 324                 if (i == num_records) {
 325                         kvp_file_info[pool].num_records--;
 326                         kvp_update_file(pool);
 327                         return 0;
 328                 }
 329
 330                 j = i;
 331                 k = j + 1;
 332                 for (; k < num_records; k++) {
 333                         strcpy(record[j].key, record[k].key);
 334                         strcpy(record[j].value, record[k].value);
 335                         j++;
 336                 }
 337
 338                 kvp_file_info[pool].num_records--;
 339                 kvp_update_file(pool);
 340                 return 0;
 341         }
 342         return 1;
 343 }
 344
 345 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
 346                         int value_size)
 347 {
 348         int i;
 349         int num_records;
 350         struct kvp_record *record;
 351         int num_blocks;
 352
 353         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 354                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 355                 return 1;
 356
 357         /*
 358          * First update the in-memory state.
 359          */
 360         kvp_update_mem_state(pool);
 361
 362         num_records = kvp_file_info[pool].num_records;
 363         record = kvp_file_info[pool].records;
 364         num_blocks = kvp_file_info[pool].num_blocks;
 365
 366         for (i = 0; i < num_records; i++) {
 367                 if (memcmp(key, record[i].key, key_size))
 368                         continue;
 369                 /*
 370                  * Found a match; just update the value -
 371                  * this is the modify case.
 372                  */
 373                 memcpy(record[i].value, value, value_size);
 374                 kvp_update_file(pool);
 375                 return 0;
 376         }
 377
 378         /*
 379          * Need to add a new entry;
 380          */
 381         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 382                 /* Need to allocate a larger array for reg entries. */
 383                 record = realloc(record, sizeof(struct kvp_record) *
 384                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 385
 386                 if (record == NULL)
 387                         return 1;
 388                 kvp_file_info[pool].num_blocks++;
 389
 390         }
 391         memcpy(record[i].value, value, value_size);
 392         memcpy(record[i].key, key, key_size);
 393         kvp_file_info[pool].records = record;
 394         kvp_file_info[pool].num_records++;
 395         kvp_update_file(pool);
 396         return 0;
 397 }
 398
 399 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
 400                         int value_size)
 401 {
 402         int i;
 403         int num_records;
 404         struct kvp_record *record;
 405
 406         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 407                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 408                 return 1;
 409
 410         /*
 411          * First update the in-memory state.
 412          */
 413         kvp_update_mem_state(pool);
 414
 415         num_records = kvp_file_info[pool].num_records;
 416         record = kvp_file_info[pool].records;
 417
 418         for (i = 0; i < num_records; i++) {
 419                 if (memcmp(key, record[i].key, key_size))
 420                         continue;
 421                 /*
 422                  * Found a match; just copy the value out.
 423                  */
 424                 memcpy(value, record[i].value, value_size);
 425                 return 0;
 426         }
 427
 428         return 1;
 429 }
 430
 431 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
 432                                 char *value, int value_size)
 433 {
 434         struct kvp_record *record;
 435
 436         /*
 437          * First update our in-memory database.
 438          */
 439         kvp_update_mem_state(pool);
 440         record = kvp_file_info[pool].records;
 441
 442         if (index >= kvp_file_info[pool].num_records) {
 443                 return 1;
 444         }
 445
 446         memcpy(key, record[index].key, key_size);
 447         memcpy(value, record[index].value, value_size);
 448         return 0;
 449 }
 450
 451
 452 void kvp_get_os_info(void)
 453 {
 454         FILE    *file;
 455         char    *p, buf[512];
 456
 457         uname(&uts_buf);
 458         os_version = uts_buf.release;
 459         os_build = strdup(uts_buf.release);
 460
 461         os_name = uts_buf.sysname;
 462         processor_arch = uts_buf.machine;
 463
 464         /*
 465          * The current windows host (win7) expects the build
 466          * string to be of the form: x.y.z
 467          * Strip additional information we may have.
 468          */
 469         p = strchr(os_version, '-');
 470         if (p)
 471                 *p = '\0';
 472
 473         /*
 474          * Parse the /etc/os-release file if present:
 475          * http://www.freedesktop.org/software/systemd/man/os-release.html
 476          */
 477         file = fopen("/etc/os-release", "r");
 478         if (file != NULL) {
 479                 while (fgets(buf, sizeof(buf), file)) {
 480                         char *value, *q;
 481
 482                         /* Ignore comments */
 483                         if (buf[0] == '#')
 484                                 continue;
 485
 486                         /* Split into name=value */
 487                         p = strchr(buf, '=');
 488                         if (!p)
 489                                 continue;
 490                         *p++ = 0;
 491
 492                         /* Remove quotes and newline; un-escape */
 493                         value = p;
 494                         q = p;
 495                         while (*p) {
 496                                 if (*p == '\\') {
 497                                         ++p;
 498                                         if (!*p)
 499                                                 break;
 500                                         *q++ = *p++;
 501                                 } else if (*p == '\'' || *p == '"' ||
 502                                            *p == '\n') {
 503                                         ++p;
 504                                 } else {
 505                                         *q++ = *p++;
 506                                 }
 507                         }
 508                         *q = 0;
 509
 510                         if (!strcmp(buf, "NAME")) {
 511                                 p = strdup(value);
 512                                 if (!p)
 513                                         break;
 514                                 os_name = p;
 515                         } else if (!strcmp(buf, "VERSION_ID")) {
 516                                 p = strdup(value);
 517                                 if (!p)
 518                                         break;
 519                                 os_major = p;
 520                         }
 521                 }
 522                 fclose(file);
 523                 return;
 524         }
 525
 526         /* Fallback for older RH/SUSE releases */
 527         file = fopen("/etc/SuSE-release", "r");
 528         if (file != NULL)
 529                 goto kvp_osinfo_found;
 530         file  = fopen("/etc/redhat-release", "r");
 531         if (file != NULL)
 532                 goto kvp_osinfo_found;
 533
 534         /*
 535          * We don't have information about the os.
 536          */
 537         return;
 538
 539 kvp_osinfo_found:
 540         /* up to three lines */
 541         p = fgets(buf, sizeof(buf), file);
 542         if (p) {
 543                 p = strchr(buf, '\n');
 544                 if (p)
 545                         *p = '\0';
 546                 p = strdup(buf);
 547                 if (!p)
 548                         goto done;
 549                 os_name = p;
 550
 551                 /* second line */
 552                 p = fgets(buf, sizeof(buf), file);
 553                 if (p) {
 554                         p = strchr(buf, '\n');
 555                         if (p)
 556                                 *p = '\0';
 557                         p = strdup(buf);
 558                         if (!p)
 559                                 goto done;
 560                         os_major = p;
 561
 562                         /* third line */
 563                         p = fgets(buf, sizeof(buf), file);
 564                         if (p)  {
 565                                 p = strchr(buf, '\n');
 566                                 if (p)
 567                                         *p = '\0';
 568                                 p = strdup(buf);
 569                                 if (p)
 570                                         os_minor = p;
 571                         }
 572                 }
 573         }
 574
 575 done:
 576         fclose(file);
 577         return;
 578 }
 579
 580
 581
 582 /*
 583  * Retrieve an interface name corresponding to the specified guid.
 584  * If there is a match, the function returns a pointer
 585  * to the interface name and if not, a NULL is returned.
 586  * If a match is found, the caller is responsible for
 587  * freeing the memory.
 588  */
 589
 590 static char *kvp_get_if_name(char *guid)
 591 {
 592         DIR *dir;
 593         struct dirent *entry;
 594         FILE    *file;
 595         char    *p, *q, *x;
 596         char    *if_name = NULL;
 597         char    buf[256];
 598         char *kvp_net_dir = "/sys/class/net/";
 599         char dev_id[256];
 600
 601         dir = opendir(kvp_net_dir);
 602         if (dir == NULL)
 603                 return NULL;
 604
 605         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 606         q = dev_id + strlen(kvp_net_dir);
 607
 608         while ((entry = readdir(dir)) != NULL) {
 609                 /*
 610                  * Set the state for the next pass.
 611                  */
 612                 *q = '\0';
 613                 strcat(dev_id, entry->d_name);
 614                 strcat(dev_id, "/device/device_id");
 615
 616                 file = fopen(dev_id, "r");
 617                 if (file == NULL)
 618                         continue;
 619
 620                 p = fgets(buf, sizeof(buf), file);
 621                 if (p) {
 622                         x = strchr(p, '\n');
 623                         if (x)
 624                                 *x = '\0';
 625
 626                         if (!strcmp(p, guid)) {
 627                                 /*
 628                                  * Found the guid match; return the interface
 629                                  * name. The caller will free the memory.
 630                                  */
 631                                 if_name = strdup(entry->d_name);
 632                                 fclose(file);
 633                                 break;
 634                         }
 635                 }
 636                 fclose(file);
 637         }
 638
 639         closedir(dir);
 640         return if_name;
 641 }
 642
 643 /*
 644  * Retrieve the MAC address given the interface name.
 645  */
 646
 647 static char *kvp_if_name_to_mac(char *if_name)
 648 {
 649         FILE    *file;
 650         char    *p, *x;
 651         char    buf[256];
 652         char addr_file[256];
 653         int i;
 654         char *mac_addr = NULL;
 655
 656         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 657                 if_name, "/address");
 658
 659         file = fopen(addr_file, "r");
 660         if (file == NULL)
 661                 return NULL;
 662
 663         p = fgets(buf, sizeof(buf), file);
 664         if (p) {
 665                 x = strchr(p, '\n');
 666                 if (x)
 667                         *x = '\0';
 668                 for (i = 0; i < strlen(p); i++)
 669                         p[i] = toupper(p[i]);
 670                 mac_addr = strdup(p);
 671         }
 672
 673         fclose(file);
 674         return mac_addr;
 675 }
 676
 677
 678 /*
 679  * Retrieve the interface name given tha MAC address.
 680  */
 681
 682 static char *kvp_mac_to_if_name(char *mac)
 683 {
 684         DIR *dir;
 685         struct dirent *entry;
 686         FILE    *file;
 687         char    *p, *q, *x;
 688         char    *if_name = NULL;
 689         char    buf[256];
 690         char *kvp_net_dir = "/sys/class/net/";
 691         char dev_id[256];
 692         int i;
 693
 694         dir = opendir(kvp_net_dir);
 695         if (dir == NULL)
 696                 return NULL;
 697
 698         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 699         q = dev_id + strlen(kvp_net_dir);
 700
 701         while ((entry = readdir(dir)) != NULL) {
 702                 /*
 703                  * Set the state for the next pass.
 704                  */
 705                 *q = '\0';
 706
 707                 strcat(dev_id, entry->d_name);
 708                 strcat(dev_id, "/address");
 709
 710                 file = fopen(dev_id, "r");
 711                 if (file == NULL)
 712                         continue;
 713
 714                 p = fgets(buf, sizeof(buf), file);
 715                 if (p) {
 716                         x = strchr(p, '\n');
 717                         if (x)
 718                                 *x = '\0';
 719
 720                         for (i = 0; i < strlen(p); i++)
 721                                 p[i] = toupper(p[i]);
 722
 723                         if (!strcmp(p, mac)) {
 724                                 /*
 725                                  * Found the MAC match; return the interface
 726                                  * name. The caller will free the memory.
 727                                  */
 728                                 if_name = strdup(entry->d_name);
 729                                 fclose(file);
 730                                 break;
 731                         }
 732                 }
 733                 fclose(file);
 734         }
 735
 736         closedir(dir);
 737         return if_name;
 738 }
 739
 740
 741 static void kvp_process_ipconfig_file(char *cmd,
 742                                         char *config_buf, int len,
 743                                         int element_size, int offset)
 744 {
 745         char buf[256];
 746         char *p;
 747         char *x;
 748         FILE *file;
 749
 750         /*
 751          * First execute the command.
 752          */
 753         file = popen(cmd, "r");
 754         if (file == NULL)
 755                 return;
 756
 757         if (offset == 0)
 758                 memset(config_buf, 0, len);
 759         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 760                 if ((len - strlen(config_buf)) < (element_size + 1))
 761                         break;
 762
 763                 x = strchr(p, '\n');
 764                 *x = '\0';
 765                 strcat(config_buf, p);
 766                 strcat(config_buf, ";");
 767         }
 768         pclose(file);
 769 }
 770
 771 static void kvp_get_ipconfig_info(char *if_name,
 772                                  struct hv_kvp_ipaddr_value *buffer)
 773 {
 774         char cmd[512];
 775         char dhcp_info[128];
 776         char *p;
 777         FILE *file;
 778
 779         /*
 780          * Get the address of default gateway (ipv4).
 781          */
 782         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 783         strcat(cmd, " | awk '/default/ {print $3 }'");
 784
 785         /*
 786          * Execute the command to gather gateway info.
 787          */
 788         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 789                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 790
 791         /*
 792          * Get the address of default gateway (ipv6).
 793          */
 794         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 795         strcat(cmd, " | awk '/default/ {print $3 }'");
 796
 797         /*
 798          * Execute the command to gather gateway info (ipv6).
 799          */
 800         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 801                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 802
 803
 804         /*
 805          * Gather the DNS  state.
 806          * Since there is no standard way to get this information
 807          * across various distributions of interest; we just invoke
 808          * an external script that needs to be ported across distros
 809          * of interest.
 810          *
 811          * Following is the expected format of the information from the script:
 812          *
 813          * ipaddr1 (nameserver1)
 814          * ipaddr2 (nameserver2)
 815          * .
 816          * .
 817          */
 818
 819         sprintf(cmd, "%s",  "hv_get_dns_info");
 820
 821         /*
 822          * Execute the command to gather DNS info.
 823          */
 824         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 825                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 826
 827         /*
 828          * Gather the DHCP state.
 829          * We will gather this state by invoking an external script.
 830          * The parameter to the script is the interface name.
 831          * Here is the expected output:
 832          *
 833          * Enabled: DHCP enabled.
 834          */
 835
 836         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 837
 838         file = popen(cmd, "r");
 839         if (file == NULL)
 840                 return;
 841
 842         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 843         if (p == NULL) {
 844                 pclose(file);
 845                 return;
 846         }
 847
 848         if (!strncmp(p, "Enabled", 7))
 849                 buffer->dhcp_enabled = 1;
 850         else
 851                 buffer->dhcp_enabled = 0;
 852
 853         pclose(file);
 854 }
 855
 856
 857 static unsigned int hweight32(unsigned int *w)
 858 {
 859         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 860         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 861         res = (res + (res >> 4)) & 0x0F0F0F0F;
 862         res = res + (res >> 8);
 863         return (res + (res >> 16)) & 0x000000FF;
 864 }
 865
 866 static int kvp_process_ip_address(void *addrp,
 867                                 int family, char *buffer,
 868                                 int length,  int *offset)
 869 {
 870         struct sockaddr_in *addr;
 871         struct sockaddr_in6 *addr6;
 872         int addr_length;
 873         char tmp[50];
 874         const char *str;
 875
 876         if (family == AF_INET) {
 877                 addr = (struct sockaddr_in *)addrp;
 878                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 879                 addr_length = INET_ADDRSTRLEN;
 880         } else {
 881                 addr6 = (struct sockaddr_in6 *)addrp;
 882                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 883                 addr_length = INET6_ADDRSTRLEN;
 884         }
 885
 886         if ((length - *offset) < addr_length + 2)
 887                 return HV_E_FAIL;
 888         if (str == NULL) {
 889                 strcpy(buffer, "inet_ntop failed\n");
 890                 return HV_E_FAIL;
 891         }
 892         if (*offset == 0)
 893                 strcpy(buffer, tmp);
 894         else {
 895                 strcat(buffer, ";");
 896                 strcat(buffer, tmp);
 897         }
 898
 899         *offset += strlen(str) + 1;
 900
 901         return 0;
 902 }
 903
 904 static int
 905 kvp_get_ip_info(int family, char *if_name, int op,
 906                  void  *out_buffer, int length)
 907 {
 908         struct ifaddrs *ifap;
 909         struct ifaddrs *curp;
 910         int offset = 0;
 911         int sn_offset = 0;
 912         int error = 0;
 913         char *buffer;
 914         struct hv_kvp_ipaddr_value *ip_buffer;
 915         char cidr_mask[5]; /* /xyz */
 916         int weight;
 917         int i;
 918         unsigned int *w;
 919         char *sn_str;
 920         struct sockaddr_in6 *addr6;
 921
 922         if (op == KVP_OP_ENUMERATE) {
 923                 buffer = out_buffer;
 924         } else {
 925                 ip_buffer = out_buffer;
 926                 buffer = (char *)ip_buffer->ip_addr;
 927                 ip_buffer->addr_family = 0;
 928         }
 929         /*
 930          * On entry into this function, the buffer is capable of holding the
 931          * maximum key value.
 932          */
 933
 934         if (getifaddrs(&ifap)) {
 935                 strcpy(buffer, "getifaddrs failed\n");
 936                 return HV_E_FAIL;
 937         }
 938
 939         curp = ifap;
 940         while (curp != NULL) {
 941                 if (curp->ifa_addr == NULL) {
 942                         curp = curp->ifa_next;
 943                         continue;
 944                 }
 945
 946                 if ((if_name != NULL) &&
 947                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 948                         /*
 949                          * We want info about a specific interface;
 950                          * just continue.
 951                          */
 952                         curp = curp->ifa_next;
 953                         continue;
 954                 }
 955
 956                 /*
 957                  * We only support two address families: AF_INET and AF_INET6.
 958                  * If a family value of 0 is specified, we collect both
 959                  * supported address families; if not we gather info on
 960                  * the specified address family.
 961                  */
 962                 if ((((family != 0) &&
 963                          (curp->ifa_addr->sa_family != family))) ||
 964                          (curp->ifa_flags & IFF_LOOPBACK)) {
 965                         curp = curp->ifa_next;
 966                         continue;
 967                 }
 968                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 969                         (curp->ifa_addr->sa_family != AF_INET6)) {
 970                         curp = curp->ifa_next;
 971                         continue;
 972                 }
 973
 974                 if (op == KVP_OP_GET_IP_INFO) {
 975                         /*
 976                          * Gather info other than the IP address.
 977                          * IP address info will be gathered later.
 978                          */
 979                         if (curp->ifa_addr->sa_family == AF_INET) {
 980                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 981                                 /*
 982                                  * Get subnet info.
 983                                  */
 984                                 error = kvp_process_ip_address(
 985                                                              curp->ifa_netmask,
 986                                                              AF_INET,
 987                                                              (char *)
 988                                                              ip_buffer->sub_net,
 989                                                              length,
 990                                                              &sn_offset);
 991                                 if (error)
 992                                         goto gather_ipaddr;
 993                         } else {
 994                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 995
 996                                 /*
 997                                  * Get subnet info in CIDR format.
 998                                  */
 999                                 weight = 0;
1000                                 sn_str = (char *)ip_buffer->sub_net;
1001                                 addr6 = (struct sockaddr_in6 *)
1002                                         curp->ifa_netmask;
1003                                 w = addr6->sin6_addr.s6_addr32;
1004
1005                                 for (i = 0; i < 4; i++)
1006                                         weight += hweight32(&w[i]);
1007
1008                                 sprintf(cidr_mask, "/%d", weight);
1009                                 if ((length - sn_offset) <
1010                                         (strlen(cidr_mask) + 1))
1011                                         goto gather_ipaddr;
1012
1013                                 if (sn_offset == 0)
1014                                         strcpy(sn_str, cidr_mask);
1015                                 else
1016                                         strcat(sn_str, cidr_mask);
1017                                 strcat((char *)ip_buffer->sub_net, ";");
1018                                 sn_offset += strlen(sn_str) + 1;
1019                         }
1020
1021                         /*
1022                          * Collect other ip related configuration info.
1023                          */
1024
1025                         kvp_get_ipconfig_info(if_name, ip_buffer);
1026                 }
1027
1028 gather_ipaddr:
1029                 error = kvp_process_ip_address(curp->ifa_addr,
1030                                                 curp->ifa_addr->sa_family,
1031                                                 buffer,
1032                                                 length, &offset);
1033                 if (error)
1034                         goto getaddr_done;
1035
1036                 curp = curp->ifa_next;
1037         }
1038
1039 getaddr_done:
1040         freeifaddrs(ifap);
1041         return error;
1042 }
1043
1044
1045 static int expand_ipv6(char *addr, int type)
1046 {
1047         int ret;
1048         struct in6_addr v6_addr;
1049
1050         ret = inet_pton(AF_INET6, addr, &v6_addr);
1051
1052         if (ret != 1) {
1053                 if (type == NETMASK)
1054                         return 1;
1055                 return 0;
1056         }
1057
1058         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1059                 "%02x%02x:%02x%02x:%02x%02x",
1060                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1061                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1062                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1063                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1064                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1065                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1066                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1067                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1068
1069         return 1;
1070
1071 }
1072
1073 static int is_ipv4(char *addr)
1074 {
1075         int ret;
1076         struct in_addr ipv4_addr;
1077
1078         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1079
1080         if (ret == 1)
1081                 return 1;
1082         return 0;
1083 }
1084
1085 static int parse_ip_val_buffer(char *in_buf, int *offset,
1086                                 char *out_buf, int out_len)
1087 {
1088         char *x;
1089         char *start;
1090
1091         /*
1092          * in_buf has sequence of characters that are seperated by
1093          * the character ';'. The last sequence does not have the
1094          * terminating ";" character.
1095          */
1096         start = in_buf + *offset;
1097
1098         x = strchr(start, ';');
1099         if (x)
1100                 *x = 0;
1101         else
1102                 x = start + strlen(start);
1103
1104         if (strlen(start) != 0) {
1105                 int i = 0;
1106                 /*
1107                  * Get rid of leading spaces.
1108                  */
1109                 while (start[i] == ' ')
1110                         i++;
1111
1112                 if ((x - start) <= out_len) {
1113                         strcpy(out_buf, (start + i));
1114                         *offset += (x - start) + 1;
1115                         return 1;
1116                 }
1117         }
1118         return 0;
1119 }
1120
1121 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1122 {
1123         int ret;
1124
1125         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1126
1127         if (ret < 0)
1128                 return HV_E_FAIL;
1129
1130         return 0;
1131 }
1132
1133
1134 static int process_ip_string(FILE *f, char *ip_string, int type)
1135 {
1136         int error = 0;
1137         char addr[INET6_ADDRSTRLEN];
1138         int i = 0;
1139         int j = 0;
1140         char str[256];
1141         char sub_str[10];
1142         int offset = 0;
1143
1144         memset(addr, 0, sizeof(addr));
1145
1146         while (parse_ip_val_buffer(ip_string, &offset, addr,
1147                                         (MAX_IP_ADDR_SIZE * 2))) {
1148
1149                 sub_str[0] = 0;
1150                 if (is_ipv4(addr)) {
1151                         switch (type) {
1152                         case IPADDR:
1153                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1154                                 break;
1155                         case NETMASK:
1156                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1157                                 break;
1158                         case GATEWAY:
1159                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1160                                 break;
1161                         case DNS:
1162                                 snprintf(str, sizeof(str), "%s", "DNS");
1163                                 break;
1164                         }
1165
1166                         if (type == DNS) {
1167                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1168                         } else if (type == GATEWAY && i == 0) {
1169                                 ++i;
1170                         } else {
1171                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1172                         }
1173
1174
1175                 } else if (expand_ipv6(addr, type)) {
1176                         switch (type) {
1177                         case IPADDR:
1178                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1179                                 break;
1180                         case NETMASK:
1181                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1182                                 break;
1183                         case GATEWAY:
1184                                 snprintf(str, sizeof(str), "%s",
1185                                         "IPV6_DEFAULTGW");
1186                                 break;
1187                         case DNS:
1188                                 snprintf(str, sizeof(str), "%s",  "DNS");
1189                                 break;
1190                         }
1191
1192                         if (type == DNS) {
1193                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1194                         } else if (j == 0) {
1195                                 ++j;
1196                         } else {
1197                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1198                         }
1199                 } else {
1200                         return  HV_INVALIDARG;
1201                 }
1202
1203                 error = kvp_write_file(f, str, sub_str, addr);
1204                 if (error)
1205                         return error;
1206                 memset(addr, 0, sizeof(addr));
1207         }
1208
1209         return 0;
1210 }
1211
1212 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1213 {
1214         int error = 0;
1215         char if_file[128];
1216         FILE *file;
1217         char cmd[512];
1218         char *mac_addr;
1219
1220         /*
1221          * Set the configuration for the specified interface with
1222          * the information provided. Since there is no standard
1223          * way to configure an interface, we will have an external
1224          * script that does the job of configuring the interface and
1225          * flushing the configuration.
1226          *
1227          * The parameters passed to this external script are:
1228          * 1. A configuration file that has the specified configuration.
1229          *
1230          * We will embed the name of the interface in the configuration
1231          * file: ifcfg-ethx (where ethx is the interface name).
1232          *
1233          * The information provided here may be more than what is needed
1234          * in a given distro to configure the interface and so are free
1235          * ignore information that may not be relevant.
1236          *
1237          * Here is the format of the ip configuration file:
1238          *
1239          * HWADDR=macaddr
1240          * DEVICE=interface name
1241          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1242          *                       or "none" if no boot-time protocol should be used)
1243          *
1244          * IPADDR0=ipaddr1
1245          * IPADDR1=ipaddr2
1246          * IPADDRx=ipaddry (where y = x + 1)
1247          *
1248          * NETMASK0=netmask1
1249          * NETMASKx=netmasky (where y = x + 1)
1250          *
1251          * GATEWAY=ipaddr1
1252          * GATEWAYx=ipaddry (where y = x + 1)
1253          *
1254          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1255          *
1256          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1257          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1258          * IPV6NETMASK.
1259          *
1260          * The host can specify multiple ipv4 and ipv6 addresses to be
1261          * configured for the interface. Furthermore, the configuration
1262          * needs to be persistent. A subsequent GET call on the interface
1263          * is expected to return the configuration that is set via the SET
1264          * call.
1265          */
1266
1267         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1268                 "/ifcfg-", if_name);
1269
1270         file = fopen(if_file, "w");
1271
1272         if (file == NULL) {
1273                 syslog(LOG_ERR, "Failed to open config file");
1274                 return HV_E_FAIL;
1275         }
1276
1277         /*
1278          * First write out the MAC address.
1279          */
1280
1281         mac_addr = kvp_if_name_to_mac(if_name);
1282         if (mac_addr == NULL) {
1283                 error = HV_E_FAIL;
1284                 goto setval_error;
1285         }
1286
1287         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1288         if (error)
1289                 goto setval_error;
1290
1291         error = kvp_write_file(file, "DEVICE", "", if_name);
1292         if (error)
1293                 goto setval_error;
1294
1295         if (new_val->dhcp_enabled) {
1296                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1297                 if (error)
1298                         goto setval_error;
1299
1300                 /*
1301                  * We are done!.
1302                  */
1303                 goto setval_done;
1304
1305         } else {
1306                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1307                 if (error)
1308                         goto setval_error;
1309         }
1310
1311         /*
1312          * Write the configuration for ipaddress, netmask, gateway and
1313          * name servers.
1314          */
1315
1316         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1317         if (error)
1318                 goto setval_error;
1319
1320         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1321         if (error)
1322                 goto setval_error;
1323
1324         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1325         if (error)
1326                 goto setval_error;
1327
1328         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1329         if (error)
1330                 goto setval_error;
1331
1332 setval_done:
1333         free(mac_addr);
1334         fclose(file);
1335
1336         /*
1337          * Now that we have populated the configuration file,
1338          * invoke the external script to do its magic.
1339          */
1340
1341         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1342         system(cmd);
1343         return 0;
1344
1345 setval_error:
1346         syslog(LOG_ERR, "Failed to write config file");
1347         free(mac_addr);
1348         fclose(file);
1349         return error;
1350 }
1351
1352
1353 static int
1354 kvp_get_domain_name(char *buffer, int length)
1355 {
1356         struct addrinfo hints, *info ;
1357         int error = 0;
1358
1359         gethostname(buffer, length);
1360         memset(&hints, 0, sizeof(hints));
1361         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1362         hints.ai_socktype = SOCK_STREAM;
1363         hints.ai_flags = AI_CANONNAME;
1364
1365         error = getaddrinfo(buffer, NULL, &hints, &info);
1366         if (error != 0) {
1367                 strcpy(buffer, "getaddrinfo failed\n");
1368                 return error;
1369         }
1370         strcpy(buffer, info->ai_canonname);
1371         freeaddrinfo(info);
1372         return error;
1373 }
1374
1375 static int
1376 netlink_send(int fd, struct cn_msg *msg)
1377 {
1378         struct nlmsghdr *nlh;
1379         unsigned int size;
1380         struct msghdr message;
1381         char buffer[64];
1382         struct iovec iov[2];
1383
1384         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
1385
1386         nlh = (struct nlmsghdr *)buffer;
1387         nlh->nlmsg_seq = 0;
1388         nlh->nlmsg_pid = getpid();
1389         nlh->nlmsg_type = NLMSG_DONE;
1390         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
1391         nlh->nlmsg_flags = 0;
1392
1393         iov[0].iov_base = nlh;
1394         iov[0].iov_len = sizeof(*nlh);
1395
1396         iov[1].iov_base = msg;
1397         iov[1].iov_len = size;
1398
1399         memset(&message, 0, sizeof(message));
1400         message.msg_name = &addr;
1401         message.msg_namelen = sizeof(addr);
1402         message.msg_iov = iov;
1403         message.msg_iovlen = 2;
1404
1405         return sendmsg(fd, &message, 0);
1406 }
1407
1408 int main(void)
1409 {
1410         int fd, len, sock_opt;
1411         int error;
1412         struct cn_msg *message;
1413         struct pollfd pfd;
1414         struct nlmsghdr *incoming_msg;
1415         struct cn_msg   *incoming_cn_msg;
1416         struct hv_kvp_msg *hv_msg;
1417         char    *p;
1418         char    *key_value;
1419         char    *key_name;
1420         int     op;
1421         int     pool;
1422         char    *if_name;
1423         struct hv_kvp_ipaddr_value *kvp_ip_val;
1424
1425         daemon(1, 0);
1426         openlog("KVP", 0, LOG_USER);
1427         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1428         /*
1429          * Retrieve OS release information.
1430          */
1431         kvp_get_os_info();
1432
1433         if (kvp_file_init()) {
1434                 syslog(LOG_ERR, "Failed to initialize the pools");
1435                 exit(EXIT_FAILURE);
1436         }
1437
1438         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1439         if (fd < 0) {
1440                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
1441                 exit(EXIT_FAILURE);
1442         }
1443         addr.nl_family = AF_NETLINK;
1444         addr.nl_pad = 0;
1445         addr.nl_pid = 0;
1446         addr.nl_groups = CN_KVP_IDX;
1447
1448
1449         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1450         if (error < 0) {
1451                 syslog(LOG_ERR, "bind failed; error:%d", error);
1452                 close(fd);
1453                 exit(EXIT_FAILURE);
1454         }
1455         sock_opt = addr.nl_groups;
1456         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
1457         /*
1458          * Register ourselves with the kernel.
1459          */
1460         message = (struct cn_msg *)kvp_send_buffer;
1461         message->id.idx = CN_KVP_IDX;
1462         message->id.val = CN_KVP_VAL;
1463
1464         hv_msg = (struct hv_kvp_msg *)message->data;
1465         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1466         message->ack = 0;
1467         message->len = sizeof(struct hv_kvp_msg);
1468
1469         len = netlink_send(fd, message);
1470         if (len < 0) {
1471                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
1472                 close(fd);
1473                 exit(EXIT_FAILURE);
1474         }
1475
1476         pfd.fd = fd;
1477
1478         while (1) {
1479                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1480                 socklen_t addr_l = sizeof(addr);
1481                 pfd.events = POLLIN;
1482                 pfd.revents = 0;
1483                 poll(&pfd, 1, -1);
1484
1485                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
1486                                 addr_p, &addr_l);
1487
1488                 if (len < 0) {
1489                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1490                                         addr.nl_pid, errno, strerror(errno));
1491                         close(fd);
1492                         return -1;
1493                 }
1494
1495                 if (addr.nl_pid) {
1496                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1497                                         addr.nl_pid);
1498                         continue;
1499                 }
1500
1501                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1502                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1503                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1504
1505                 /*
1506                  * We will use the KVP header information to pass back
1507                  * the error from this daemon. So, first copy the state
1508                  * and set the error code to success.
1509                  */
1510                 op = hv_msg->kvp_hdr.operation;
1511                 pool = hv_msg->kvp_hdr.pool;
1512                 hv_msg->error = HV_S_OK;
1513
1514                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1515                         /*
1516                          * Driver is registering with us; stash away the version
1517                          * information.
1518                          */
1519                         in_hand_shake = 0;
1520                         p = (char *)hv_msg->body.kvp_register.version;
1521                         lic_version = malloc(strlen(p) + 1);
1522                         if (lic_version) {
1523                                 strcpy(lic_version, p);
1524                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1525                                         lic_version);
1526                         } else {
1527                                 syslog(LOG_ERR, "malloc failed");
1528                         }
1529                         continue;
1530                 }
1531
1532                 switch (op) {
1533                 case KVP_OP_GET_IP_INFO:
1534                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1535                         if_name =
1536                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1537
1538                         if (if_name == NULL) {
1539                                 /*
1540                                  * We could not map the mac address to an
1541                                  * interface name; return error.
1542                                  */
1543                                 hv_msg->error = HV_E_FAIL;
1544                                 break;
1545                         }
1546                         error = kvp_get_ip_info(
1547                                                 0, if_name, KVP_OP_GET_IP_INFO,
1548                                                 kvp_ip_val,
1549                                                 (MAX_IP_ADDR_SIZE * 2));
1550
1551                         if (error)
1552                                 hv_msg->error = error;
1553
1554                         free(if_name);
1555                         break;
1556
1557                 case KVP_OP_SET_IP_INFO:
1558                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1559                         if_name = kvp_get_if_name(
1560                                         (char *)kvp_ip_val->adapter_id);
1561                         if (if_name == NULL) {
1562                                 /*
1563                                  * We could not map the guid to an
1564                                  * interface name; return error.
1565                                  */
1566                                 hv_msg->error = HV_GUID_NOTFOUND;
1567                                 break;
1568                         }
1569                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1570                         if (error)
1571                                 hv_msg->error = error;
1572
1573                         free(if_name);
1574                         break;
1575
1576                 case KVP_OP_SET:
1577                         if (kvp_key_add_or_modify(pool,
1578                                         hv_msg->body.kvp_set.data.key,
1579                                         hv_msg->body.kvp_set.data.key_size,
1580                                         hv_msg->body.kvp_set.data.value,
1581                                         hv_msg->body.kvp_set.data.value_size))
1582                                         hv_msg->error = HV_S_CONT;
1583                         break;
1584
1585                 case KVP_OP_GET:
1586                         if (kvp_get_value(pool,
1587                                         hv_msg->body.kvp_set.data.key,
1588                                         hv_msg->body.kvp_set.data.key_size,
1589                                         hv_msg->body.kvp_set.data.value,
1590                                         hv_msg->body.kvp_set.data.value_size))
1591                                         hv_msg->error = HV_S_CONT;
1592                         break;
1593
1594                 case KVP_OP_DELETE:
1595                         if (kvp_key_delete(pool,
1596                                         hv_msg->body.kvp_delete.key,
1597                                         hv_msg->body.kvp_delete.key_size))
1598                                         hv_msg->error = HV_S_CONT;
1599                         break;
1600
1601                 default:
1602                         break;
1603                 }
1604
1605                 if (op != KVP_OP_ENUMERATE)
1606                         goto kvp_done;
1607
1608                 /*
1609                  * If the pool is KVP_POOL_AUTO, dynamically generate
1610                  * both the key and the value; if not read from the
1611                  * appropriate pool.
1612                  */
1613                 if (pool != KVP_POOL_AUTO) {
1614                         if (kvp_pool_enumerate(pool,
1615                                         hv_msg->body.kvp_enum_data.index,
1616                                         hv_msg->body.kvp_enum_data.data.key,
1617                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1618                                         hv_msg->body.kvp_enum_data.data.value,
1619                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1620                                         hv_msg->error = HV_S_CONT;
1621                         goto kvp_done;
1622                 }
1623
1624                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1625                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1626                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1627
1628                 switch (hv_msg->body.kvp_enum_data.index) {
1629                 case FullyQualifiedDomainName:
1630                         kvp_get_domain_name(key_value,
1631                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1632                         strcpy(key_name, "FullyQualifiedDomainName");
1633                         break;
1634                 case IntegrationServicesVersion:
1635                         strcpy(key_name, "IntegrationServicesVersion");
1636                         strcpy(key_value, lic_version);
1637                         break;
1638                 case NetworkAddressIPv4:
1639                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1640                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1641                         strcpy(key_name, "NetworkAddressIPv4");
1642                         break;
1643                 case NetworkAddressIPv6:
1644                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1645                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1646                         strcpy(key_name, "NetworkAddressIPv6");
1647                         break;
1648                 case OSBuildNumber:
1649                         strcpy(key_value, os_build);
1650                         strcpy(key_name, "OSBuildNumber");
1651                         break;
1652                 case OSName:
1653                         strcpy(key_value, os_name);
1654                         strcpy(key_name, "OSName");
1655                         break;
1656                 case OSMajorVersion:
1657                         strcpy(key_value, os_major);
1658                         strcpy(key_name, "OSMajorVersion");
1659                         break;
1660                 case OSMinorVersion:
1661                         strcpy(key_value, os_minor);
1662                         strcpy(key_name, "OSMinorVersion");
1663                         break;
1664                 case OSVersion:
1665                         strcpy(key_value, os_version);
1666                         strcpy(key_name, "OSVersion");
1667                         break;
1668                 case ProcessorArchitecture:
1669                         strcpy(key_value, processor_arch);
1670                         strcpy(key_name, "ProcessorArchitecture");
1671                         break;
1672                 default:
1673                         hv_msg->error = HV_S_CONT;
1674                         break;
1675                 }
1676                 /*
1677                  * Send the value back to the kernel. The response is
1678                  * already in the receive buffer. Update the cn_msg header to
1679                  * reflect the key value that has been added to the message
1680                  */
1681 kvp_done:
1682
1683                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1684                 incoming_cn_msg->id.val = CN_KVP_VAL;
1685                 incoming_cn_msg->ack = 0;
1686                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1687
1688                 len = netlink_send(fd, incoming_cn_msg);
1689                 if (len < 0) {
1690                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
1691                         exit(EXIT_FAILURE);
1692                 }
1693         }
1694
1695 }