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 #ifndef SOL_NETLINK
 106 #define SOL_NETLINK 270
 107 #endif
 108
 109 struct kvp_record {
 110         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 111         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 112 };
 113
 114 struct kvp_file_state {
 115         int fd;
 116         int num_blocks;
 117         struct kvp_record *records;
 118         int num_records;
 119         char fname[MAX_FILE_NAME];
 120 };
 121
 122 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 123
 124 static void kvp_acquire_lock(int pool)
 125 {
 126         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 127         fl.l_pid = getpid();
 128
 129         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 130                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
 131                 exit(EXIT_FAILURE);
 132         }
 133 }
 134
 135 static void kvp_release_lock(int pool)
 136 {
 137         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 138         fl.l_pid = getpid();
 139
 140         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 141                 perror("fcntl");
 142                 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
 143                 exit(EXIT_FAILURE);
 144         }
 145 }
 146
 147 static void kvp_update_file(int pool)
 148 {
 149         FILE *filep;
 150         size_t bytes_written;
 151
 152         /*
 153          * We are going to write our in-memory registry out to
 154          * disk; acquire the lock first.
 155          */
 156         kvp_acquire_lock(pool);
 157
 158         filep = fopen(kvp_file_info[pool].fname, "we");
 159         if (!filep) {
 160                 kvp_release_lock(pool);
 161                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 162                 exit(EXIT_FAILURE);
 163         }
 164
 165         bytes_written = fwrite(kvp_file_info[pool].records,
 166                                 sizeof(struct kvp_record),
 167                                 kvp_file_info[pool].num_records, filep);
 168
 169         if (ferror(filep) || fclose(filep)) {
 170                 kvp_release_lock(pool);
 171                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 172                 exit(EXIT_FAILURE);
 173         }
 174
 175         kvp_release_lock(pool);
 176 }
 177
 178 static void kvp_update_mem_state(int pool)
 179 {
 180         FILE *filep;
 181         size_t records_read = 0;
 182         struct kvp_record *record = kvp_file_info[pool].records;
 183         struct kvp_record *readp;
 184         int num_blocks = kvp_file_info[pool].num_blocks;
 185         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 186
 187         kvp_acquire_lock(pool);
 188
 189         filep = fopen(kvp_file_info[pool].fname, "re");
 190         if (!filep) {
 191                 kvp_release_lock(pool);
 192                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
 193                 exit(EXIT_FAILURE);
 194         }
 195         for (;;) {
 196                 readp = &record[records_read];
 197                 records_read += fread(readp, sizeof(struct kvp_record),
 198                                         ENTRIES_PER_BLOCK * num_blocks,
 199                                         filep);
 200
 201                 if (ferror(filep)) {
 202                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
 203                         exit(EXIT_FAILURE);
 204                 }
 205
 206                 if (!feof(filep)) {
 207                         /*
 208                          * We have more data to read.
 209                          */
 210                         num_blocks++;
 211                         record = realloc(record, alloc_unit * num_blocks);
 212
 213                         if (record == NULL) {
 214                                 syslog(LOG_ERR, "malloc failed");
 215                                 exit(EXIT_FAILURE);
 216                         }
 217                         continue;
 218                 }
 219                 break;
 220         }
 221
 222         kvp_file_info[pool].num_blocks = num_blocks;
 223         kvp_file_info[pool].records = record;
 224         kvp_file_info[pool].num_records = records_read;
 225
 226         fclose(filep);
 227         kvp_release_lock(pool);
 228 }
 229 static int kvp_file_init(void)
 230 {
 231         int  fd;
 232         FILE *filep;
 233         size_t records_read;
 234         char *fname;
 235         struct kvp_record *record;
 236         struct kvp_record *readp;
 237         int num_blocks;
 238         int i;
 239         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 240
 241         if (access(KVP_CONFIG_LOC, F_OK)) {
 242                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 243                         syslog(LOG_ERR, " Failed to create %s", KVP_CONFIG_LOC);
 244                         exit(EXIT_FAILURE);
 245                 }
 246         }
 247
 248         for (i = 0; i < KVP_POOL_COUNT; i++) {
 249                 fname = kvp_file_info[i].fname;
 250                 records_read = 0;
 251                 num_blocks = 1;
 252                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 253                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 254
 255                 if (fd == -1)
 256                         return 1;
 257
 258
 259                 filep = fopen(fname, "re");
 260                 if (!filep)
 261                         return 1;
 262
 263                 record = malloc(alloc_unit * num_blocks);
 264                 if (record == NULL) {
 265                         fclose(filep);
 266                         return 1;
 267                 }
 268                 for (;;) {
 269                         readp = &record[records_read];
 270                         records_read += fread(readp, sizeof(struct kvp_record),
 271                                         ENTRIES_PER_BLOCK,
 272                                         filep);
 273
 274                         if (ferror(filep)) {
 275                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 276                                        i);
 277                                 exit(EXIT_FAILURE);
 278                         }
 279
 280                         if (!feof(filep)) {
 281                                 /*
 282                                  * We have more data to read.
 283                                  */
 284                                 num_blocks++;
 285                                 record = realloc(record, alloc_unit *
 286                                                 num_blocks);
 287                                 if (record == NULL) {
 288                                         fclose(filep);
 289                                         return 1;
 290                                 }
 291                                 continue;
 292                         }
 293                         break;
 294                 }
 295                 kvp_file_info[i].fd = fd;
 296                 kvp_file_info[i].num_blocks = num_blocks;
 297                 kvp_file_info[i].records = record;
 298                 kvp_file_info[i].num_records = records_read;
 299                 fclose(filep);
 300
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int kvp_key_delete(int pool, const char *key, int key_size)
 307 {
 308         int i;
 309         int j, k;
 310         int num_records;
 311         struct kvp_record *record;
 312
 313         /*
 314          * First update the in-memory state.
 315          */
 316         kvp_update_mem_state(pool);
 317
 318         num_records = kvp_file_info[pool].num_records;
 319         record = kvp_file_info[pool].records;
 320
 321         for (i = 0; i < num_records; i++) {
 322                 if (memcmp(key, record[i].key, key_size))
 323                         continue;
 324                 /*
 325                  * Found a match; just move the remaining
 326                  * entries up.
 327                  */
 328                 if (i == num_records) {
 329                         kvp_file_info[pool].num_records--;
 330                         kvp_update_file(pool);
 331                         return 0;
 332                 }
 333
 334                 j = i;
 335                 k = j + 1;
 336                 for (; k < num_records; k++) {
 337                         strcpy(record[j].key, record[k].key);
 338                         strcpy(record[j].value, record[k].value);
 339                         j++;
 340                 }
 341
 342                 kvp_file_info[pool].num_records--;
 343                 kvp_update_file(pool);
 344                 return 0;
 345         }
 346         return 1;
 347 }
 348
 349 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
 350                         int value_size)
 351 {
 352         int i;
 353         int num_records;
 354         struct kvp_record *record;
 355         int num_blocks;
 356
 357         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 358                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 359                 return 1;
 360
 361         /*
 362          * First update the in-memory state.
 363          */
 364         kvp_update_mem_state(pool);
 365
 366         num_records = kvp_file_info[pool].num_records;
 367         record = kvp_file_info[pool].records;
 368         num_blocks = kvp_file_info[pool].num_blocks;
 369
 370         for (i = 0; i < num_records; i++) {
 371                 if (memcmp(key, record[i].key, key_size))
 372                         continue;
 373                 /*
 374                  * Found a match; just update the value -
 375                  * this is the modify case.
 376                  */
 377                 memcpy(record[i].value, value, value_size);
 378                 kvp_update_file(pool);
 379                 return 0;
 380         }
 381
 382         /*
 383          * Need to add a new entry;
 384          */
 385         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 386                 /* Need to allocate a larger array for reg entries. */
 387                 record = realloc(record, sizeof(struct kvp_record) *
 388                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 389
 390                 if (record == NULL)
 391                         return 1;
 392                 kvp_file_info[pool].num_blocks++;
 393
 394         }
 395         memcpy(record[i].value, value, value_size);
 396         memcpy(record[i].key, key, key_size);
 397         kvp_file_info[pool].records = record;
 398         kvp_file_info[pool].num_records++;
 399         kvp_update_file(pool);
 400         return 0;
 401 }
 402
 403 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
 404                         int value_size)
 405 {
 406         int i;
 407         int num_records;
 408         struct kvp_record *record;
 409
 410         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 411                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 412                 return 1;
 413
 414         /*
 415          * First update the in-memory state.
 416          */
 417         kvp_update_mem_state(pool);
 418
 419         num_records = kvp_file_info[pool].num_records;
 420         record = kvp_file_info[pool].records;
 421
 422         for (i = 0; i < num_records; i++) {
 423                 if (memcmp(key, record[i].key, key_size))
 424                         continue;
 425                 /*
 426                  * Found a match; just copy the value out.
 427                  */
 428                 memcpy(value, record[i].value, value_size);
 429                 return 0;
 430         }
 431
 432         return 1;
 433 }
 434
 435 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
 436                                 char *value, int value_size)
 437 {
 438         struct kvp_record *record;
 439
 440         /*
 441          * First update our in-memory database.
 442          */
 443         kvp_update_mem_state(pool);
 444         record = kvp_file_info[pool].records;
 445
 446         if (index >= kvp_file_info[pool].num_records) {
 447                 return 1;
 448         }
 449
 450         memcpy(key, record[index].key, key_size);
 451         memcpy(value, record[index].value, value_size);
 452         return 0;
 453 }
 454
 455
 456 void kvp_get_os_info(void)
 457 {
 458         FILE    *file;
 459         char    *p, buf[512];
 460
 461         uname(&uts_buf);
 462         os_version = uts_buf.release;
 463         os_build = strdup(uts_buf.release);
 464
 465         os_name = uts_buf.sysname;
 466         processor_arch = uts_buf.machine;
 467
 468         /*
 469          * The current windows host (win7) expects the build
 470          * string to be of the form: x.y.z
 471          * Strip additional information we may have.
 472          */
 473         p = strchr(os_version, '-');
 474         if (p)
 475                 *p = '\0';
 476
 477         /*
 478          * Parse the /etc/os-release file if present:
 479          * http://www.freedesktop.org/software/systemd/man/os-release.html
 480          */
 481         file = fopen("/etc/os-release", "r");
 482         if (file != NULL) {
 483                 while (fgets(buf, sizeof(buf), file)) {
 484                         char *value, *q;
 485
 486                         /* Ignore comments */
 487                         if (buf[0] == '#')
 488                                 continue;
 489
 490                         /* Split into name=value */
 491                         p = strchr(buf, '=');
 492                         if (!p)
 493                                 continue;
 494                         *p++ = 0;
 495
 496                         /* Remove quotes and newline; un-escape */
 497                         value = p;
 498                         q = p;
 499                         while (*p) {
 500                                 if (*p == '\\') {
 501                                         ++p;
 502                                         if (!*p)
 503                                                 break;
 504                                         *q++ = *p++;
 505                                 } else if (*p == '\'' || *p == '"' ||
 506                                            *p == '\n') {
 507                                         ++p;
 508                                 } else {
 509                                         *q++ = *p++;
 510                                 }
 511                         }
 512                         *q = 0;
 513
 514                         if (!strcmp(buf, "NAME")) {
 515                                 p = strdup(value);
 516                                 if (!p)
 517                                         break;
 518                                 os_name = p;
 519                         } else if (!strcmp(buf, "VERSION_ID")) {
 520                                 p = strdup(value);
 521                                 if (!p)
 522                                         break;
 523                                 os_major = p;
 524                         }
 525                 }
 526                 fclose(file);
 527                 return;
 528         }
 529
 530         /* Fallback for older RH/SUSE releases */
 531         file = fopen("/etc/SuSE-release", "r");
 532         if (file != NULL)
 533                 goto kvp_osinfo_found;
 534         file  = fopen("/etc/redhat-release", "r");
 535         if (file != NULL)
 536                 goto kvp_osinfo_found;
 537
 538         /*
 539          * We don't have information about the os.
 540          */
 541         return;
 542
 543 kvp_osinfo_found:
 544         /* up to three lines */
 545         p = fgets(buf, sizeof(buf), file);
 546         if (p) {
 547                 p = strchr(buf, '\n');
 548                 if (p)
 549                         *p = '\0';
 550                 p = strdup(buf);
 551                 if (!p)
 552                         goto done;
 553                 os_name = p;
 554
 555                 /* second line */
 556                 p = fgets(buf, sizeof(buf), file);
 557                 if (p) {
 558                         p = strchr(buf, '\n');
 559                         if (p)
 560                                 *p = '\0';
 561                         p = strdup(buf);
 562                         if (!p)
 563                                 goto done;
 564                         os_major = p;
 565
 566                         /* third line */
 567                         p = fgets(buf, sizeof(buf), file);
 568                         if (p)  {
 569                                 p = strchr(buf, '\n');
 570                                 if (p)
 571                                         *p = '\0';
 572                                 p = strdup(buf);
 573                                 if (p)
 574                                         os_minor = p;
 575                         }
 576                 }
 577         }
 578
 579 done:
 580         fclose(file);
 581         return;
 582 }
 583
 584
 585
 586 /*
 587  * Retrieve an interface name corresponding to the specified guid.
 588  * If there is a match, the function returns a pointer
 589  * to the interface name and if not, a NULL is returned.
 590  * If a match is found, the caller is responsible for
 591  * freeing the memory.
 592  */
 593
 594 static char *kvp_get_if_name(char *guid)
 595 {
 596         DIR *dir;
 597         struct dirent *entry;
 598         FILE    *file;
 599         char    *p, *q, *x;
 600         char    *if_name = NULL;
 601         char    buf[256];
 602         char *kvp_net_dir = "/sys/class/net/";
 603         char dev_id[256];
 604
 605         dir = opendir(kvp_net_dir);
 606         if (dir == NULL)
 607                 return NULL;
 608
 609         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 610         q = dev_id + strlen(kvp_net_dir);
 611
 612         while ((entry = readdir(dir)) != NULL) {
 613                 /*
 614                  * Set the state for the next pass.
 615                  */
 616                 *q = '\0';
 617                 strcat(dev_id, entry->d_name);
 618                 strcat(dev_id, "/device/device_id");
 619
 620                 file = fopen(dev_id, "r");
 621                 if (file == NULL)
 622                         continue;
 623
 624                 p = fgets(buf, sizeof(buf), file);
 625                 if (p) {
 626                         x = strchr(p, '\n');
 627                         if (x)
 628                                 *x = '\0';
 629
 630                         if (!strcmp(p, guid)) {
 631                                 /*
 632                                  * Found the guid match; return the interface
 633                                  * name. The caller will free the memory.
 634                                  */
 635                                 if_name = strdup(entry->d_name);
 636                                 fclose(file);
 637                                 break;
 638                         }
 639                 }
 640                 fclose(file);
 641         }
 642
 643         closedir(dir);
 644         return if_name;
 645 }
 646
 647 /*
 648  * Retrieve the MAC address given the interface name.
 649  */
 650
 651 static char *kvp_if_name_to_mac(char *if_name)
 652 {
 653         FILE    *file;
 654         char    *p, *x;
 655         char    buf[256];
 656         char addr_file[256];
 657         int i;
 658         char *mac_addr = NULL;
 659
 660         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 661                 if_name, "/address");
 662
 663         file = fopen(addr_file, "r");
 664         if (file == NULL)
 665                 return NULL;
 666
 667         p = fgets(buf, sizeof(buf), file);
 668         if (p) {
 669                 x = strchr(p, '\n');
 670                 if (x)
 671                         *x = '\0';
 672                 for (i = 0; i < strlen(p); i++)
 673                         p[i] = toupper(p[i]);
 674                 mac_addr = strdup(p);
 675         }
 676
 677         fclose(file);
 678         return mac_addr;
 679 }
 680
 681
 682 /*
 683  * Retrieve the interface name given tha MAC address.
 684  */
 685
 686 static char *kvp_mac_to_if_name(char *mac)
 687 {
 688         DIR *dir;
 689         struct dirent *entry;
 690         FILE    *file;
 691         char    *p, *q, *x;
 692         char    *if_name = NULL;
 693         char    buf[256];
 694         char *kvp_net_dir = "/sys/class/net/";
 695         char dev_id[256];
 696         int i;
 697
 698         dir = opendir(kvp_net_dir);
 699         if (dir == NULL)
 700                 return NULL;
 701
 702         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 703         q = dev_id + strlen(kvp_net_dir);
 704
 705         while ((entry = readdir(dir)) != NULL) {
 706                 /*
 707                  * Set the state for the next pass.
 708                  */
 709                 *q = '\0';
 710
 711                 strcat(dev_id, entry->d_name);
 712                 strcat(dev_id, "/address");
 713
 714                 file = fopen(dev_id, "r");
 715                 if (file == NULL)
 716                         continue;
 717
 718                 p = fgets(buf, sizeof(buf), file);
 719                 if (p) {
 720                         x = strchr(p, '\n');
 721                         if (x)
 722                                 *x = '\0';
 723
 724                         for (i = 0; i < strlen(p); i++)
 725                                 p[i] = toupper(p[i]);
 726
 727                         if (!strcmp(p, mac)) {
 728                                 /*
 729                                  * Found the MAC match; return the interface
 730                                  * name. The caller will free the memory.
 731                                  */
 732                                 if_name = strdup(entry->d_name);
 733                                 fclose(file);
 734                                 break;
 735                         }
 736                 }
 737                 fclose(file);
 738         }
 739
 740         closedir(dir);
 741         return if_name;
 742 }
 743
 744
 745 static void kvp_process_ipconfig_file(char *cmd,
 746                                         char *config_buf, int len,
 747                                         int element_size, int offset)
 748 {
 749         char buf[256];
 750         char *p;
 751         char *x;
 752         FILE *file;
 753
 754         /*
 755          * First execute the command.
 756          */
 757         file = popen(cmd, "r");
 758         if (file == NULL)
 759                 return;
 760
 761         if (offset == 0)
 762                 memset(config_buf, 0, len);
 763         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 764                 if ((len - strlen(config_buf)) < (element_size + 1))
 765                         break;
 766
 767                 x = strchr(p, '\n');
 768                 *x = '\0';
 769                 strcat(config_buf, p);
 770                 strcat(config_buf, ";");
 771         }
 772         pclose(file);
 773 }
 774
 775 static void kvp_get_ipconfig_info(char *if_name,
 776                                  struct hv_kvp_ipaddr_value *buffer)
 777 {
 778         char cmd[512];
 779         char dhcp_info[128];
 780         char *p;
 781         FILE *file;
 782
 783         /*
 784          * Get the address of default gateway (ipv4).
 785          */
 786         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 787         strcat(cmd, " | awk '/default/ {print $3 }'");
 788
 789         /*
 790          * Execute the command to gather gateway info.
 791          */
 792         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 793                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 794
 795         /*
 796          * Get the address of default gateway (ipv6).
 797          */
 798         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 799         strcat(cmd, " | awk '/default/ {print $3 }'");
 800
 801         /*
 802          * Execute the command to gather gateway info (ipv6).
 803          */
 804         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 805                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 806
 807
 808         /*
 809          * Gather the DNS  state.
 810          * Since there is no standard way to get this information
 811          * across various distributions of interest; we just invoke
 812          * an external script that needs to be ported across distros
 813          * of interest.
 814          *
 815          * Following is the expected format of the information from the script:
 816          *
 817          * ipaddr1 (nameserver1)
 818          * ipaddr2 (nameserver2)
 819          * .
 820          * .
 821          */
 822
 823         sprintf(cmd, "%s",  "hv_get_dns_info");
 824
 825         /*
 826          * Execute the command to gather DNS info.
 827          */
 828         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 829                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 830
 831         /*
 832          * Gather the DHCP state.
 833          * We will gather this state by invoking an external script.
 834          * The parameter to the script is the interface name.
 835          * Here is the expected output:
 836          *
 837          * Enabled: DHCP enabled.
 838          */
 839
 840         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 841
 842         file = popen(cmd, "r");
 843         if (file == NULL)
 844                 return;
 845
 846         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 847         if (p == NULL) {
 848                 pclose(file);
 849                 return;
 850         }
 851
 852         if (!strncmp(p, "Enabled", 7))
 853                 buffer->dhcp_enabled = 1;
 854         else
 855                 buffer->dhcp_enabled = 0;
 856
 857         pclose(file);
 858 }
 859
 860
 861 static unsigned int hweight32(unsigned int *w)
 862 {
 863         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 864         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 865         res = (res + (res >> 4)) & 0x0F0F0F0F;
 866         res = res + (res >> 8);
 867         return (res + (res >> 16)) & 0x000000FF;
 868 }
 869
 870 static int kvp_process_ip_address(void *addrp,
 871                                 int family, char *buffer,
 872                                 int length,  int *offset)
 873 {
 874         struct sockaddr_in *addr;
 875         struct sockaddr_in6 *addr6;
 876         int addr_length;
 877         char tmp[50];
 878         const char *str;
 879
 880         if (family == AF_INET) {
 881                 addr = (struct sockaddr_in *)addrp;
 882                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 883                 addr_length = INET_ADDRSTRLEN;
 884         } else {
 885                 addr6 = (struct sockaddr_in6 *)addrp;
 886                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 887                 addr_length = INET6_ADDRSTRLEN;
 888         }
 889
 890         if ((length - *offset) < addr_length + 2)
 891                 return HV_E_FAIL;
 892         if (str == NULL) {
 893                 strcpy(buffer, "inet_ntop failed\n");
 894                 return HV_E_FAIL;
 895         }
 896         if (*offset == 0)
 897                 strcpy(buffer, tmp);
 898         else {
 899                 strcat(buffer, ";");
 900                 strcat(buffer, tmp);
 901         }
 902
 903         *offset += strlen(str) + 1;
 904
 905         return 0;
 906 }
 907
 908 static int
 909 kvp_get_ip_info(int family, char *if_name, int op,
 910                  void  *out_buffer, int length)
 911 {
 912         struct ifaddrs *ifap;
 913         struct ifaddrs *curp;
 914         int offset = 0;
 915         int sn_offset = 0;
 916         int error = 0;
 917         char *buffer;
 918         struct hv_kvp_ipaddr_value *ip_buffer;
 919         char cidr_mask[5]; /* /xyz */
 920         int weight;
 921         int i;
 922         unsigned int *w;
 923         char *sn_str;
 924         struct sockaddr_in6 *addr6;
 925
 926         if (op == KVP_OP_ENUMERATE) {
 927                 buffer = out_buffer;
 928         } else {
 929                 ip_buffer = out_buffer;
 930                 buffer = (char *)ip_buffer->ip_addr;
 931                 ip_buffer->addr_family = 0;
 932         }
 933         /*
 934          * On entry into this function, the buffer is capable of holding the
 935          * maximum key value.
 936          */
 937
 938         if (getifaddrs(&ifap)) {
 939                 strcpy(buffer, "getifaddrs failed\n");
 940                 return HV_E_FAIL;
 941         }
 942
 943         curp = ifap;
 944         while (curp != NULL) {
 945                 if (curp->ifa_addr == NULL) {
 946                         curp = curp->ifa_next;
 947                         continue;
 948                 }
 949
 950                 if ((if_name != NULL) &&
 951                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 952                         /*
 953                          * We want info about a specific interface;
 954                          * just continue.
 955                          */
 956                         curp = curp->ifa_next;
 957                         continue;
 958                 }
 959
 960                 /*
 961                  * We only support two address families: AF_INET and AF_INET6.
 962                  * If a family value of 0 is specified, we collect both
 963                  * supported address families; if not we gather info on
 964                  * the specified address family.
 965                  */
 966                 if ((((family != 0) &&
 967                          (curp->ifa_addr->sa_family != family))) ||
 968                          (curp->ifa_flags & IFF_LOOPBACK)) {
 969                         curp = curp->ifa_next;
 970                         continue;
 971                 }
 972                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 973                         (curp->ifa_addr->sa_family != AF_INET6)) {
 974                         curp = curp->ifa_next;
 975                         continue;
 976                 }
 977
 978                 if (op == KVP_OP_GET_IP_INFO) {
 979                         /*
 980                          * Gather info other than the IP address.
 981                          * IP address info will be gathered later.
 982                          */
 983                         if (curp->ifa_addr->sa_family == AF_INET) {
 984                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 985                                 /*
 986                                  * Get subnet info.
 987                                  */
 988                                 error = kvp_process_ip_address(
 989                                                              curp->ifa_netmask,
 990                                                              AF_INET,
 991                                                              (char *)
 992                                                              ip_buffer->sub_net,
 993                                                              length,
 994                                                              &sn_offset);
 995                                 if (error)
 996                                         goto gather_ipaddr;
 997                         } else {
 998                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 999
1000                                 /*
1001                                  * Get subnet info in CIDR format.
1002                                  */
1003                                 weight = 0;
1004                                 sn_str = (char *)ip_buffer->sub_net;
1005                                 addr6 = (struct sockaddr_in6 *)
1006                                         curp->ifa_netmask;
1007                                 w = addr6->sin6_addr.s6_addr32;
1008
1009                                 for (i = 0; i < 4; i++)
1010                                         weight += hweight32(&w[i]);
1011
1012                                 sprintf(cidr_mask, "/%d", weight);
1013                                 if ((length - sn_offset) <
1014                                         (strlen(cidr_mask) + 1))
1015                                         goto gather_ipaddr;
1016
1017                                 if (sn_offset == 0)
1018                                         strcpy(sn_str, cidr_mask);
1019                                 else {
1020                                         strcat((char *)ip_buffer->sub_net, ";");
1021                                         strcat(sn_str, cidr_mask);
1022                                 }
1023                                 sn_offset += strlen(sn_str) + 1;
1024                         }
1025
1026                         /*
1027                          * Collect other ip related configuration info.
1028                          */
1029
1030                         kvp_get_ipconfig_info(if_name, ip_buffer);
1031                 }
1032
1033 gather_ipaddr:
1034                 error = kvp_process_ip_address(curp->ifa_addr,
1035                                                 curp->ifa_addr->sa_family,
1036                                                 buffer,
1037                                                 length, &offset);
1038                 if (error)
1039                         goto getaddr_done;
1040
1041                 curp = curp->ifa_next;
1042         }
1043
1044 getaddr_done:
1045         freeifaddrs(ifap);
1046         return error;
1047 }
1048
1049
1050 static int expand_ipv6(char *addr, int type)
1051 {
1052         int ret;
1053         struct in6_addr v6_addr;
1054
1055         ret = inet_pton(AF_INET6, addr, &v6_addr);
1056
1057         if (ret != 1) {
1058                 if (type == NETMASK)
1059                         return 1;
1060                 return 0;
1061         }
1062
1063         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1064                 "%02x%02x:%02x%02x:%02x%02x",
1065                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1066                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1067                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1068                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1069                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1070                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1071                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1072                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1073
1074         return 1;
1075
1076 }
1077
1078 static int is_ipv4(char *addr)
1079 {
1080         int ret;
1081         struct in_addr ipv4_addr;
1082
1083         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1084
1085         if (ret == 1)
1086                 return 1;
1087         return 0;
1088 }
1089
1090 static int parse_ip_val_buffer(char *in_buf, int *offset,
1091                                 char *out_buf, int out_len)
1092 {
1093         char *x;
1094         char *start;
1095
1096         /*
1097          * in_buf has sequence of characters that are seperated by
1098          * the character ';'. The last sequence does not have the
1099          * terminating ";" character.
1100          */
1101         start = in_buf + *offset;
1102
1103         x = strchr(start, ';');
1104         if (x)
1105                 *x = 0;
1106         else
1107                 x = start + strlen(start);
1108
1109         if (strlen(start) != 0) {
1110                 int i = 0;
1111                 /*
1112                  * Get rid of leading spaces.
1113                  */
1114                 while (start[i] == ' ')
1115                         i++;
1116
1117                 if ((x - start) <= out_len) {
1118                         strcpy(out_buf, (start + i));
1119                         *offset += (x - start) + 1;
1120                         return 1;
1121                 }
1122         }
1123         return 0;
1124 }
1125
1126 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1127 {
1128         int ret;
1129
1130         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1131
1132         if (ret < 0)
1133                 return HV_E_FAIL;
1134
1135         return 0;
1136 }
1137
1138
1139 static int process_ip_string(FILE *f, char *ip_string, int type)
1140 {
1141         int error = 0;
1142         char addr[INET6_ADDRSTRLEN];
1143         int i = 0;
1144         int j = 0;
1145         char str[256];
1146         char sub_str[10];
1147         int offset = 0;
1148
1149         memset(addr, 0, sizeof(addr));
1150
1151         while (parse_ip_val_buffer(ip_string, &offset, addr,
1152                                         (MAX_IP_ADDR_SIZE * 2))) {
1153
1154                 sub_str[0] = 0;
1155                 if (is_ipv4(addr)) {
1156                         switch (type) {
1157                         case IPADDR:
1158                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1159                                 break;
1160                         case NETMASK:
1161                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1162                                 break;
1163                         case GATEWAY:
1164                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1165                                 break;
1166                         case DNS:
1167                                 snprintf(str, sizeof(str), "%s", "DNS");
1168                                 break;
1169                         }
1170
1171                         if (type == DNS) {
1172                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1173                         } else if (type == GATEWAY && i == 0) {
1174                                 ++i;
1175                         } else {
1176                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1177                         }
1178
1179
1180                 } else if (expand_ipv6(addr, type)) {
1181                         switch (type) {
1182                         case IPADDR:
1183                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1184                                 break;
1185                         case NETMASK:
1186                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1187                                 break;
1188                         case GATEWAY:
1189                                 snprintf(str, sizeof(str), "%s",
1190                                         "IPV6_DEFAULTGW");
1191                                 break;
1192                         case DNS:
1193                                 snprintf(str, sizeof(str), "%s",  "DNS");
1194                                 break;
1195                         }
1196
1197                         if (type == DNS) {
1198                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1199                         } else if (j == 0) {
1200                                 ++j;
1201                         } else {
1202                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1203                         }
1204                 } else {
1205                         return  HV_INVALIDARG;
1206                 }
1207
1208                 error = kvp_write_file(f, str, sub_str, addr);
1209                 if (error)
1210                         return error;
1211                 memset(addr, 0, sizeof(addr));
1212         }
1213
1214         return 0;
1215 }
1216
1217 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1218 {
1219         int error = 0;
1220         char if_file[128];
1221         FILE *file;
1222         char cmd[512];
1223         char *mac_addr;
1224
1225         /*
1226          * Set the configuration for the specified interface with
1227          * the information provided. Since there is no standard
1228          * way to configure an interface, we will have an external
1229          * script that does the job of configuring the interface and
1230          * flushing the configuration.
1231          *
1232          * The parameters passed to this external script are:
1233          * 1. A configuration file that has the specified configuration.
1234          *
1235          * We will embed the name of the interface in the configuration
1236          * file: ifcfg-ethx (where ethx is the interface name).
1237          *
1238          * The information provided here may be more than what is needed
1239          * in a given distro to configure the interface and so are free
1240          * ignore information that may not be relevant.
1241          *
1242          * Here is the format of the ip configuration file:
1243          *
1244          * HWADDR=macaddr
1245          * DEVICE=interface name
1246          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1247          *                       or "none" if no boot-time protocol should be used)
1248          *
1249          * IPADDR0=ipaddr1
1250          * IPADDR1=ipaddr2
1251          * IPADDRx=ipaddry (where y = x + 1)
1252          *
1253          * NETMASK0=netmask1
1254          * NETMASKx=netmasky (where y = x + 1)
1255          *
1256          * GATEWAY=ipaddr1
1257          * GATEWAYx=ipaddry (where y = x + 1)
1258          *
1259          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1260          *
1261          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1262          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1263          * IPV6NETMASK.
1264          *
1265          * The host can specify multiple ipv4 and ipv6 addresses to be
1266          * configured for the interface. Furthermore, the configuration
1267          * needs to be persistent. A subsequent GET call on the interface
1268          * is expected to return the configuration that is set via the SET
1269          * call.
1270          */
1271
1272         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1273                 "/ifcfg-", if_name);
1274
1275         file = fopen(if_file, "w");
1276
1277         if (file == NULL) {
1278                 syslog(LOG_ERR, "Failed to open config file");
1279                 return HV_E_FAIL;
1280         }
1281
1282         /*
1283          * First write out the MAC address.
1284          */
1285
1286         mac_addr = kvp_if_name_to_mac(if_name);
1287         if (mac_addr == NULL) {
1288                 error = HV_E_FAIL;
1289                 goto setval_error;
1290         }
1291
1292         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1293         if (error)
1294                 goto setval_error;
1295
1296         error = kvp_write_file(file, "DEVICE", "", if_name);
1297         if (error)
1298                 goto setval_error;
1299
1300         if (new_val->dhcp_enabled) {
1301                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1302                 if (error)
1303                         goto setval_error;
1304
1305                 /*
1306                  * We are done!.
1307                  */
1308                 goto setval_done;
1309
1310         } else {
1311                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1312                 if (error)
1313                         goto setval_error;
1314         }
1315
1316         /*
1317          * Write the configuration for ipaddress, netmask, gateway and
1318          * name servers.
1319          */
1320
1321         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1322         if (error)
1323                 goto setval_error;
1324
1325         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1326         if (error)
1327                 goto setval_error;
1328
1329         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1330         if (error)
1331                 goto setval_error;
1332
1333         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1334         if (error)
1335                 goto setval_error;
1336
1337 setval_done:
1338         free(mac_addr);
1339         fclose(file);
1340
1341         /*
1342          * Now that we have populated the configuration file,
1343          * invoke the external script to do its magic.
1344          */
1345
1346         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1347         system(cmd);
1348         return 0;
1349
1350 setval_error:
1351         syslog(LOG_ERR, "Failed to write config file");
1352         free(mac_addr);
1353         fclose(file);
1354         return error;
1355 }
1356
1357
1358 static int
1359 kvp_get_domain_name(char *buffer, int length)
1360 {
1361         struct addrinfo hints, *info ;
1362         int error = 0;
1363
1364         gethostname(buffer, length);
1365         memset(&hints, 0, sizeof(hints));
1366         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1367         hints.ai_socktype = SOCK_STREAM;
1368         hints.ai_flags = AI_CANONNAME;
1369
1370         error = getaddrinfo(buffer, NULL, &hints, &info);
1371         if (error != 0) {
1372                 strcpy(buffer, "getaddrinfo failed\n");
1373                 return error;
1374         }
1375         strcpy(buffer, info->ai_canonname);
1376         freeaddrinfo(info);
1377         return error;
1378 }
1379
1380 static int
1381 netlink_send(int fd, struct cn_msg *msg)
1382 {
1383         struct nlmsghdr *nlh;
1384         unsigned int size;
1385         struct msghdr message;
1386         char buffer[64];
1387         struct iovec iov[2];
1388
1389         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
1390
1391         nlh = (struct nlmsghdr *)buffer;
1392         nlh->nlmsg_seq = 0;
1393         nlh->nlmsg_pid = getpid();
1394         nlh->nlmsg_type = NLMSG_DONE;
1395         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
1396         nlh->nlmsg_flags = 0;
1397
1398         iov[0].iov_base = nlh;
1399         iov[0].iov_len = sizeof(*nlh);
1400
1401         iov[1].iov_base = msg;
1402         iov[1].iov_len = size;
1403
1404         memset(&message, 0, sizeof(message));
1405         message.msg_name = &addr;
1406         message.msg_namelen = sizeof(addr);
1407         message.msg_iov = iov;
1408         message.msg_iovlen = 2;
1409
1410         return sendmsg(fd, &message, 0);
1411 }
1412
1413 int main(void)
1414 {
1415         int fd, len, nl_group;
1416         int error;
1417         struct cn_msg *message;
1418         struct pollfd pfd;
1419         struct nlmsghdr *incoming_msg;
1420         struct cn_msg   *incoming_cn_msg;
1421         struct hv_kvp_msg *hv_msg;
1422         char    *p;
1423         char    *key_value;
1424         char    *key_name;
1425         int     op;
1426         int     pool;
1427         char    *if_name;
1428         struct hv_kvp_ipaddr_value *kvp_ip_val;
1429
1430         daemon(1, 0);
1431         openlog("KVP", 0, LOG_USER);
1432         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1433         /*
1434          * Retrieve OS release information.
1435          */
1436         kvp_get_os_info();
1437
1438         if (kvp_file_init()) {
1439                 syslog(LOG_ERR, "Failed to initialize the pools");
1440                 exit(EXIT_FAILURE);
1441         }
1442
1443         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1444         if (fd < 0) {
1445                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
1446                 exit(EXIT_FAILURE);
1447         }
1448         addr.nl_family = AF_NETLINK;
1449         addr.nl_pad = 0;
1450         addr.nl_pid = 0;
1451         addr.nl_groups = 0;
1452
1453
1454         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1455         if (error < 0) {
1456                 syslog(LOG_ERR, "bind failed; error:%d", error);
1457                 close(fd);
1458                 exit(EXIT_FAILURE);
1459         }
1460         nl_group = CN_KVP_IDX;
1461         setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group));
1462         /*
1463          * Register ourselves with the kernel.
1464          */
1465         message = (struct cn_msg *)kvp_send_buffer;
1466         message->id.idx = CN_KVP_IDX;
1467         message->id.val = CN_KVP_VAL;
1468
1469         hv_msg = (struct hv_kvp_msg *)message->data;
1470         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1471         message->ack = 0;
1472         message->len = sizeof(struct hv_kvp_msg);
1473
1474         len = netlink_send(fd, message);
1475         if (len < 0) {
1476                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
1477                 close(fd);
1478                 exit(EXIT_FAILURE);
1479         }
1480
1481         pfd.fd = fd;
1482
1483         while (1) {
1484                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1485                 socklen_t addr_l = sizeof(addr);
1486                 pfd.events = POLLIN;
1487                 pfd.revents = 0;
1488                 poll(&pfd, 1, -1);
1489
1490                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
1491                                 addr_p, &addr_l);
1492
1493                 if (len < 0) {
1494                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1495                                         addr.nl_pid, errno, strerror(errno));
1496                         close(fd);
1497                         return -1;
1498                 }
1499
1500                 if (addr.nl_pid) {
1501                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1502                                         addr.nl_pid);
1503                         continue;
1504                 }
1505
1506                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1507
1508                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1509                         continue;
1510
1511                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1512                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1513
1514                 /*
1515                  * We will use the KVP header information to pass back
1516                  * the error from this daemon. So, first copy the state
1517                  * and set the error code to success.
1518                  */
1519                 op = hv_msg->kvp_hdr.operation;
1520                 pool = hv_msg->kvp_hdr.pool;
1521                 hv_msg->error = HV_S_OK;
1522
1523                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1524                         /*
1525                          * Driver is registering with us; stash away the version
1526                          * information.
1527                          */
1528                         in_hand_shake = 0;
1529                         p = (char *)hv_msg->body.kvp_register.version;
1530                         lic_version = malloc(strlen(p) + 1);
1531                         if (lic_version) {
1532                                 strcpy(lic_version, p);
1533                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1534                                         lic_version);
1535                         } else {
1536                                 syslog(LOG_ERR, "malloc failed");
1537                         }
1538                         continue;
1539                 }
1540
1541                 switch (op) {
1542                 case KVP_OP_GET_IP_INFO:
1543                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1544                         if_name =
1545                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1546
1547                         if (if_name == NULL) {
1548                                 /*
1549                                  * We could not map the mac address to an
1550                                  * interface name; return error.
1551                                  */
1552                                 hv_msg->error = HV_E_FAIL;
1553                                 break;
1554                         }
1555                         error = kvp_get_ip_info(
1556                                                 0, if_name, KVP_OP_GET_IP_INFO,
1557                                                 kvp_ip_val,
1558                                                 (MAX_IP_ADDR_SIZE * 2));
1559
1560                         if (error)
1561                                 hv_msg->error = error;
1562
1563                         free(if_name);
1564                         break;
1565
1566                 case KVP_OP_SET_IP_INFO:
1567                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1568                         if_name = kvp_get_if_name(
1569                                         (char *)kvp_ip_val->adapter_id);
1570                         if (if_name == NULL) {
1571                                 /*
1572                                  * We could not map the guid to an
1573                                  * interface name; return error.
1574                                  */
1575                                 hv_msg->error = HV_GUID_NOTFOUND;
1576                                 break;
1577                         }
1578                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1579                         if (error)
1580                                 hv_msg->error = error;
1581
1582                         free(if_name);
1583                         break;
1584
1585                 case KVP_OP_SET:
1586                         if (kvp_key_add_or_modify(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_GET:
1595                         if (kvp_get_value(pool,
1596                                         hv_msg->body.kvp_set.data.key,
1597                                         hv_msg->body.kvp_set.data.key_size,
1598                                         hv_msg->body.kvp_set.data.value,
1599                                         hv_msg->body.kvp_set.data.value_size))
1600                                         hv_msg->error = HV_S_CONT;
1601                         break;
1602
1603                 case KVP_OP_DELETE:
1604                         if (kvp_key_delete(pool,
1605                                         hv_msg->body.kvp_delete.key,
1606                                         hv_msg->body.kvp_delete.key_size))
1607                                         hv_msg->error = HV_S_CONT;
1608                         break;
1609
1610                 default:
1611                         break;
1612                 }
1613
1614                 if (op != KVP_OP_ENUMERATE)
1615                         goto kvp_done;
1616
1617                 /*
1618                  * If the pool is KVP_POOL_AUTO, dynamically generate
1619                  * both the key and the value; if not read from the
1620                  * appropriate pool.
1621                  */
1622                 if (pool != KVP_POOL_AUTO) {
1623                         if (kvp_pool_enumerate(pool,
1624                                         hv_msg->body.kvp_enum_data.index,
1625                                         hv_msg->body.kvp_enum_data.data.key,
1626                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1627                                         hv_msg->body.kvp_enum_data.data.value,
1628                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1629                                         hv_msg->error = HV_S_CONT;
1630                         goto kvp_done;
1631                 }
1632
1633                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1634                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1635                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1636
1637                 switch (hv_msg->body.kvp_enum_data.index) {
1638                 case FullyQualifiedDomainName:
1639                         kvp_get_domain_name(key_value,
1640                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1641                         strcpy(key_name, "FullyQualifiedDomainName");
1642                         break;
1643                 case IntegrationServicesVersion:
1644                         strcpy(key_name, "IntegrationServicesVersion");
1645                         strcpy(key_value, lic_version);
1646                         break;
1647                 case NetworkAddressIPv4:
1648                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1649                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1650                         strcpy(key_name, "NetworkAddressIPv4");
1651                         break;
1652                 case NetworkAddressIPv6:
1653                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1654                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1655                         strcpy(key_name, "NetworkAddressIPv6");
1656                         break;
1657                 case OSBuildNumber:
1658                         strcpy(key_value, os_build);
1659                         strcpy(key_name, "OSBuildNumber");
1660                         break;
1661                 case OSName:
1662                         strcpy(key_value, os_name);
1663                         strcpy(key_name, "OSName");
1664                         break;
1665                 case OSMajorVersion:
1666                         strcpy(key_value, os_major);
1667                         strcpy(key_name, "OSMajorVersion");
1668                         break;
1669                 case OSMinorVersion:
1670                         strcpy(key_value, os_minor);
1671                         strcpy(key_name, "OSMinorVersion");
1672                         break;
1673                 case OSVersion:
1674                         strcpy(key_value, os_version);
1675                         strcpy(key_name, "OSVersion");
1676                         break;
1677                 case ProcessorArchitecture:
1678                         strcpy(key_value, processor_arch);
1679                         strcpy(key_name, "ProcessorArchitecture");
1680                         break;
1681                 default:
1682                         hv_msg->error = HV_S_CONT;
1683                         break;
1684                 }
1685                 /*
1686                  * Send the value back to the kernel. The response is
1687                  * already in the receive buffer. Update the cn_msg header to
1688                  * reflect the key value that has been added to the message
1689                  */
1690 kvp_done:
1691
1692                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1693                 incoming_cn_msg->id.val = CN_KVP_VAL;
1694                 incoming_cn_msg->ack = 0;
1695                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1696
1697                 len = netlink_send(fd, incoming_cn_msg);
1698                 if (len < 0) {
1699                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
1700                         exit(EXIT_FAILURE);
1701                 }
1702         }
1703
1704 }