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 <stdio.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <errno.h>
  35 #include <arpa/inet.h>
  36 #include <linux/connector.h>
  37 #include <linux/hyperv.h>
  38 #include <linux/netlink.h>
  39 #include <ifaddrs.h>
  40 #include <netdb.h>
  41 #include <syslog.h>
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44 #include <dirent.h>
  45 #include <net/if.h>
  46 #include <getopt.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 struct sockaddr_nl addr;
  83 static int in_hand_shake = 1;
  84
  85 static char *os_name = "";
  86 static char *os_major = "";
  87 static char *os_minor = "";
  88 static char *processor_arch;
  89 static char *os_build;
  90 static char *os_version;
  91 static char *lic_version = "Unknown version";
  92 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  93 static struct utsname uts_buf;
  94
  95 /*
  96  * The location of the interface configuration file.
  97  */
  98
  99 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 100
 101 #define MAX_FILE_NAME 100
 102 #define ENTRIES_PER_BLOCK 50
 103
 104 #ifndef SOL_NETLINK
 105 #define SOL_NETLINK 270
 106 #endif
 107
 108 struct kvp_record {
 109         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 110         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 111 };
 112
 113 struct kvp_file_state {
 114         int fd;
 115         int num_blocks;
 116         struct kvp_record *records;
 117         int num_records;
 118         char fname[MAX_FILE_NAME];
 119 };
 120
 121 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 122
 123 static void kvp_acquire_lock(int pool)
 124 {
 125         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 126         fl.l_pid = getpid();
 127
 128         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 129                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 130                                 errno, strerror(errno));
 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                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 142                                 errno, strerror(errno));
 143                 exit(EXIT_FAILURE);
 144         }
 145 }
 146
 147 static void kvp_update_file(int pool)
 148 {
 149         FILE *filep;
 150
 151         /*
 152          * We are going to write our in-memory registry out to
 153          * disk; acquire the lock first.
 154          */
 155         kvp_acquire_lock(pool);
 156
 157         filep = fopen(kvp_file_info[pool].fname, "we");
 158         if (!filep) {
 159                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 160                                 errno, strerror(errno));
 161                 kvp_release_lock(pool);
 162                 exit(EXIT_FAILURE);
 163         }
 164
 165         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
 166                                 kvp_file_info[pool].num_records, filep);
 167
 168         if (ferror(filep) || fclose(filep)) {
 169                 kvp_release_lock(pool);
 170                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 171                 exit(EXIT_FAILURE);
 172         }
 173
 174         kvp_release_lock(pool);
 175 }
 176
 177 static void kvp_update_mem_state(int pool)
 178 {
 179         FILE *filep;
 180         size_t records_read = 0;
 181         struct kvp_record *record = kvp_file_info[pool].records;
 182         struct kvp_record *readp;
 183         int num_blocks = kvp_file_info[pool].num_blocks;
 184         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 185
 186         kvp_acquire_lock(pool);
 187
 188         filep = fopen(kvp_file_info[pool].fname, "re");
 189         if (!filep) {
 190                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 191                                 errno, strerror(errno));
 192                 kvp_release_lock(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'; error: %d %s", KVP_CONFIG_LOC,
 244                                         errno, strerror(errno));
 245                         exit(EXIT_FAILURE);
 246                 }
 247         }
 248
 249         for (i = 0; i < KVP_POOL_COUNT; i++) {
 250                 fname = kvp_file_info[i].fname;
 251                 records_read = 0;
 252                 num_blocks = 1;
 253                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 254                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 255
 256                 if (fd == -1)
 257                         return 1;
 258
 259
 260                 filep = fopen(fname, "re");
 261                 if (!filep) {
 262                         close(fd);
 263                         return 1;
 264                 }
 265
 266                 record = malloc(alloc_unit * num_blocks);
 267                 if (record == NULL) {
 268                         fclose(filep);
 269                         close(fd);
 270                         return 1;
 271                 }
 272                 for (;;) {
 273                         readp = &record[records_read];
 274                         records_read += fread(readp, sizeof(struct kvp_record),
 275                                         ENTRIES_PER_BLOCK,
 276                                         filep);
 277
 278                         if (ferror(filep)) {
 279                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
 280                                        i);
 281                                 exit(EXIT_FAILURE);
 282                         }
 283
 284                         if (!feof(filep)) {
 285                                 /*
 286                                  * We have more data to read.
 287                                  */
 288                                 num_blocks++;
 289                                 record = realloc(record, alloc_unit *
 290                                                 num_blocks);
 291                                 if (record == NULL) {
 292                                         fclose(filep);
 293                                         close(fd);
 294                                         return 1;
 295                                 }
 296                                 continue;
 297                         }
 298                         break;
 299                 }
 300                 kvp_file_info[i].fd = fd;
 301                 kvp_file_info[i].num_blocks = num_blocks;
 302                 kvp_file_info[i].records = record;
 303                 kvp_file_info[i].num_records = records_read;
 304                 fclose(filep);
 305
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int kvp_key_delete(int pool, const char *key, int key_size)
 312 {
 313         int i;
 314         int j, k;
 315         int num_records;
 316         struct kvp_record *record;
 317
 318         /*
 319          * First update the in-memory state.
 320          */
 321         kvp_update_mem_state(pool);
 322
 323         num_records = kvp_file_info[pool].num_records;
 324         record = kvp_file_info[pool].records;
 325
 326         for (i = 0; i < num_records; i++) {
 327                 if (memcmp(key, record[i].key, key_size))
 328                         continue;
 329                 /*
 330                  * Found a match; just move the remaining
 331                  * entries up.
 332                  */
 333                 if (i == num_records) {
 334                         kvp_file_info[pool].num_records--;
 335                         kvp_update_file(pool);
 336                         return 0;
 337                 }
 338
 339                 j = i;
 340                 k = j + 1;
 341                 for (; k < num_records; k++) {
 342                         strcpy(record[j].key, record[k].key);
 343                         strcpy(record[j].value, record[k].value);
 344                         j++;
 345                 }
 346
 347                 kvp_file_info[pool].num_records--;
 348                 kvp_update_file(pool);
 349                 return 0;
 350         }
 351         return 1;
 352 }
 353
 354 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
 355                         int value_size)
 356 {
 357         int i;
 358         int num_records;
 359         struct kvp_record *record;
 360         int num_blocks;
 361
 362         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 363                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 364                 return 1;
 365
 366         /*
 367          * First update the in-memory state.
 368          */
 369         kvp_update_mem_state(pool);
 370
 371         num_records = kvp_file_info[pool].num_records;
 372         record = kvp_file_info[pool].records;
 373         num_blocks = kvp_file_info[pool].num_blocks;
 374
 375         for (i = 0; i < num_records; i++) {
 376                 if (memcmp(key, record[i].key, key_size))
 377                         continue;
 378                 /*
 379                  * Found a match; just update the value -
 380                  * this is the modify case.
 381                  */
 382                 memcpy(record[i].value, value, value_size);
 383                 kvp_update_file(pool);
 384                 return 0;
 385         }
 386
 387         /*
 388          * Need to add a new entry;
 389          */
 390         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 391                 /* Need to allocate a larger array for reg entries. */
 392                 record = realloc(record, sizeof(struct kvp_record) *
 393                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 394
 395                 if (record == NULL)
 396                         return 1;
 397                 kvp_file_info[pool].num_blocks++;
 398
 399         }
 400         memcpy(record[i].value, value, value_size);
 401         memcpy(record[i].key, key, key_size);
 402         kvp_file_info[pool].records = record;
 403         kvp_file_info[pool].num_records++;
 404         kvp_update_file(pool);
 405         return 0;
 406 }
 407
 408 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
 409                         int value_size)
 410 {
 411         int i;
 412         int num_records;
 413         struct kvp_record *record;
 414
 415         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 416                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 417                 return 1;
 418
 419         /*
 420          * First update the in-memory state.
 421          */
 422         kvp_update_mem_state(pool);
 423
 424         num_records = kvp_file_info[pool].num_records;
 425         record = kvp_file_info[pool].records;
 426
 427         for (i = 0; i < num_records; i++) {
 428                 if (memcmp(key, record[i].key, key_size))
 429                         continue;
 430                 /*
 431                  * Found a match; just copy the value out.
 432                  */
 433                 memcpy(value, record[i].value, value_size);
 434                 return 0;
 435         }
 436
 437         return 1;
 438 }
 439
 440 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
 441                                 char *value, int value_size)
 442 {
 443         struct kvp_record *record;
 444
 445         /*
 446          * First update our in-memory database.
 447          */
 448         kvp_update_mem_state(pool);
 449         record = kvp_file_info[pool].records;
 450
 451         if (index >= kvp_file_info[pool].num_records) {
 452                 return 1;
 453         }
 454
 455         memcpy(key, record[index].key, key_size);
 456         memcpy(value, record[index].value, value_size);
 457         return 0;
 458 }
 459
 460
 461 void kvp_get_os_info(void)
 462 {
 463         FILE    *file;
 464         char    *p, buf[512];
 465
 466         uname(&uts_buf);
 467         os_version = uts_buf.release;
 468         os_build = strdup(uts_buf.release);
 469
 470         os_name = uts_buf.sysname;
 471         processor_arch = uts_buf.machine;
 472
 473         /*
 474          * The current windows host (win7) expects the build
 475          * string to be of the form: x.y.z
 476          * Strip additional information we may have.
 477          */
 478         p = strchr(os_version, '-');
 479         if (p)
 480                 *p = '\0';
 481
 482         /*
 483          * Parse the /etc/os-release file if present:
 484          * http://www.freedesktop.org/software/systemd/man/os-release.html
 485          */
 486         file = fopen("/etc/os-release", "r");
 487         if (file != NULL) {
 488                 while (fgets(buf, sizeof(buf), file)) {
 489                         char *value, *q;
 490
 491                         /* Ignore comments */
 492                         if (buf[0] == '#')
 493                                 continue;
 494
 495                         /* Split into name=value */
 496                         p = strchr(buf, '=');
 497                         if (!p)
 498                                 continue;
 499                         *p++ = 0;
 500
 501                         /* Remove quotes and newline; un-escape */
 502                         value = p;
 503                         q = p;
 504                         while (*p) {
 505                                 if (*p == '\\') {
 506                                         ++p;
 507                                         if (!*p)
 508                                                 break;
 509                                         *q++ = *p++;
 510                                 } else if (*p == '\'' || *p == '"' ||
 511                                            *p == '\n') {
 512                                         ++p;
 513                                 } else {
 514                                         *q++ = *p++;
 515                                 }
 516                         }
 517                         *q = 0;
 518
 519                         if (!strcmp(buf, "NAME")) {
 520                                 p = strdup(value);
 521                                 if (!p)
 522                                         break;
 523                                 os_name = p;
 524                         } else if (!strcmp(buf, "VERSION_ID")) {
 525                                 p = strdup(value);
 526                                 if (!p)
 527                                         break;
 528                                 os_major = p;
 529                         }
 530                 }
 531                 fclose(file);
 532                 return;
 533         }
 534
 535         /* Fallback for older RH/SUSE releases */
 536         file = fopen("/etc/SuSE-release", "r");
 537         if (file != NULL)
 538                 goto kvp_osinfo_found;
 539         file  = fopen("/etc/redhat-release", "r");
 540         if (file != NULL)
 541                 goto kvp_osinfo_found;
 542
 543         /*
 544          * We don't have information about the os.
 545          */
 546         return;
 547
 548 kvp_osinfo_found:
 549         /* up to three lines */
 550         p = fgets(buf, sizeof(buf), file);
 551         if (p) {
 552                 p = strchr(buf, '\n');
 553                 if (p)
 554                         *p = '\0';
 555                 p = strdup(buf);
 556                 if (!p)
 557                         goto done;
 558                 os_name = p;
 559
 560                 /* second line */
 561                 p = fgets(buf, sizeof(buf), file);
 562                 if (p) {
 563                         p = strchr(buf, '\n');
 564                         if (p)
 565                                 *p = '\0';
 566                         p = strdup(buf);
 567                         if (!p)
 568                                 goto done;
 569                         os_major = p;
 570
 571                         /* third line */
 572                         p = fgets(buf, sizeof(buf), file);
 573                         if (p)  {
 574                                 p = strchr(buf, '\n');
 575                                 if (p)
 576                                         *p = '\0';
 577                                 p = strdup(buf);
 578                                 if (p)
 579                                         os_minor = p;
 580                         }
 581                 }
 582         }
 583
 584 done:
 585         fclose(file);
 586         return;
 587 }
 588
 589
 590
 591 /*
 592  * Retrieve an interface name corresponding to the specified guid.
 593  * If there is a match, the function returns a pointer
 594  * to the interface name and if not, a NULL is returned.
 595  * If a match is found, the caller is responsible for
 596  * freeing the memory.
 597  */
 598
 599 static char *kvp_get_if_name(char *guid)
 600 {
 601         DIR *dir;
 602         struct dirent *entry;
 603         FILE    *file;
 604         char    *p, *q, *x;
 605         char    *if_name = NULL;
 606         char    buf[256];
 607         char *kvp_net_dir = "/sys/class/net/";
 608         char dev_id[256];
 609
 610         dir = opendir(kvp_net_dir);
 611         if (dir == NULL)
 612                 return NULL;
 613
 614         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
 615         q = dev_id + strlen(kvp_net_dir);
 616
 617         while ((entry = readdir(dir)) != NULL) {
 618                 /*
 619                  * Set the state for the next pass.
 620                  */
 621                 *q = '\0';
 622                 strcat(dev_id, entry->d_name);
 623                 strcat(dev_id, "/device/device_id");
 624
 625                 file = fopen(dev_id, "r");
 626                 if (file == NULL)
 627                         continue;
 628
 629                 p = fgets(buf, sizeof(buf), file);
 630                 if (p) {
 631                         x = strchr(p, '\n');
 632                         if (x)
 633                                 *x = '\0';
 634
 635                         if (!strcmp(p, guid)) {
 636                                 /*
 637                                  * Found the guid match; return the interface
 638                                  * name. The caller will free the memory.
 639                                  */
 640                                 if_name = strdup(entry->d_name);
 641                                 fclose(file);
 642                                 break;
 643                         }
 644                 }
 645                 fclose(file);
 646         }
 647
 648         closedir(dir);
 649         return if_name;
 650 }
 651
 652 /*
 653  * Retrieve the MAC address given the interface name.
 654  */
 655
 656 static char *kvp_if_name_to_mac(char *if_name)
 657 {
 658         FILE    *file;
 659         char    *p, *x;
 660         char    buf[256];
 661         char addr_file[256];
 662         int i;
 663         char *mac_addr = NULL;
 664
 665         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
 666                 if_name, "/address");
 667
 668         file = fopen(addr_file, "r");
 669         if (file == NULL)
 670                 return NULL;
 671
 672         p = fgets(buf, sizeof(buf), file);
 673         if (p) {
 674                 x = strchr(p, '\n');
 675                 if (x)
 676                         *x = '\0';
 677                 for (i = 0; i < strlen(p); i++)
 678                         p[i] = toupper(p[i]);
 679                 mac_addr = strdup(p);
 680         }
 681
 682         fclose(file);
 683         return mac_addr;
 684 }
 685
 686
 687 /*
 688  * Retrieve the interface name given tha MAC address.
 689  */
 690
 691 static char *kvp_mac_to_if_name(char *mac)
 692 {
 693         DIR *dir;
 694         struct dirent *entry;
 695         FILE    *file;
 696         char    *p, *q, *x;
 697         char    *if_name = NULL;
 698         char    buf[256];
 699         char *kvp_net_dir = "/sys/class/net/";
 700         char dev_id[256];
 701         int i;
 702
 703         dir = opendir(kvp_net_dir);
 704         if (dir == NULL)
 705                 return NULL;
 706
 707         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
 708         q = dev_id + strlen(kvp_net_dir);
 709
 710         while ((entry = readdir(dir)) != NULL) {
 711                 /*
 712                  * Set the state for the next pass.
 713                  */
 714                 *q = '\0';
 715
 716                 strcat(dev_id, entry->d_name);
 717                 strcat(dev_id, "/address");
 718
 719                 file = fopen(dev_id, "r");
 720                 if (file == NULL)
 721                         continue;
 722
 723                 p = fgets(buf, sizeof(buf), file);
 724                 if (p) {
 725                         x = strchr(p, '\n');
 726                         if (x)
 727                                 *x = '\0';
 728
 729                         for (i = 0; i < strlen(p); i++)
 730                                 p[i] = toupper(p[i]);
 731
 732                         if (!strcmp(p, mac)) {
 733                                 /*
 734                                  * Found the MAC match; return the interface
 735                                  * name. The caller will free the memory.
 736                                  */
 737                                 if_name = strdup(entry->d_name);
 738                                 fclose(file);
 739                                 break;
 740                         }
 741                 }
 742                 fclose(file);
 743         }
 744
 745         closedir(dir);
 746         return if_name;
 747 }
 748
 749
 750 static void kvp_process_ipconfig_file(char *cmd,
 751                                         char *config_buf, int len,
 752                                         int element_size, int offset)
 753 {
 754         char buf[256];
 755         char *p;
 756         char *x;
 757         FILE *file;
 758
 759         /*
 760          * First execute the command.
 761          */
 762         file = popen(cmd, "r");
 763         if (file == NULL)
 764                 return;
 765
 766         if (offset == 0)
 767                 memset(config_buf, 0, len);
 768         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 769                 if ((len - strlen(config_buf)) < (element_size + 1))
 770                         break;
 771
 772                 x = strchr(p, '\n');
 773                 if (x)
 774                         *x = '\0';
 775
 776                 strcat(config_buf, p);
 777                 strcat(config_buf, ";");
 778         }
 779         pclose(file);
 780 }
 781
 782 static void kvp_get_ipconfig_info(char *if_name,
 783                                  struct hv_kvp_ipaddr_value *buffer)
 784 {
 785         char cmd[512];
 786         char dhcp_info[128];
 787         char *p;
 788         FILE *file;
 789
 790         /*
 791          * Get the address of default gateway (ipv4).
 792          */
 793         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 794         strcat(cmd, " | awk '/default/ {print $3 }'");
 795
 796         /*
 797          * Execute the command to gather gateway info.
 798          */
 799         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 800                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 801
 802         /*
 803          * Get the address of default gateway (ipv6).
 804          */
 805         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 806         strcat(cmd, " | awk '/default/ {print $3 }'");
 807
 808         /*
 809          * Execute the command to gather gateway info (ipv6).
 810          */
 811         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 812                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 813
 814
 815         /*
 816          * Gather the DNS  state.
 817          * Since there is no standard way to get this information
 818          * across various distributions of interest; we just invoke
 819          * an external script that needs to be ported across distros
 820          * of interest.
 821          *
 822          * Following is the expected format of the information from the script:
 823          *
 824          * ipaddr1 (nameserver1)
 825          * ipaddr2 (nameserver2)
 826          * .
 827          * .
 828          */
 829
 830         sprintf(cmd, "%s",  "hv_get_dns_info");
 831
 832         /*
 833          * Execute the command to gather DNS info.
 834          */
 835         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 836                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 837
 838         /*
 839          * Gather the DHCP state.
 840          * We will gather this state by invoking an external script.
 841          * The parameter to the script is the interface name.
 842          * Here is the expected output:
 843          *
 844          * Enabled: DHCP enabled.
 845          */
 846
 847         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
 848
 849         file = popen(cmd, "r");
 850         if (file == NULL)
 851                 return;
 852
 853         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 854         if (p == NULL) {
 855                 pclose(file);
 856                 return;
 857         }
 858
 859         if (!strncmp(p, "Enabled", 7))
 860                 buffer->dhcp_enabled = 1;
 861         else
 862                 buffer->dhcp_enabled = 0;
 863
 864         pclose(file);
 865 }
 866
 867
 868 static unsigned int hweight32(unsigned int *w)
 869 {
 870         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 871         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 872         res = (res + (res >> 4)) & 0x0F0F0F0F;
 873         res = res + (res >> 8);
 874         return (res + (res >> 16)) & 0x000000FF;
 875 }
 876
 877 static int kvp_process_ip_address(void *addrp,
 878                                 int family, char *buffer,
 879                                 int length,  int *offset)
 880 {
 881         struct sockaddr_in *addr;
 882         struct sockaddr_in6 *addr6;
 883         int addr_length;
 884         char tmp[50];
 885         const char *str;
 886
 887         if (family == AF_INET) {
 888                 addr = (struct sockaddr_in *)addrp;
 889                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 890                 addr_length = INET_ADDRSTRLEN;
 891         } else {
 892                 addr6 = (struct sockaddr_in6 *)addrp;
 893                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 894                 addr_length = INET6_ADDRSTRLEN;
 895         }
 896
 897         if ((length - *offset) < addr_length + 2)
 898                 return HV_E_FAIL;
 899         if (str == NULL) {
 900                 strcpy(buffer, "inet_ntop failed\n");
 901                 return HV_E_FAIL;
 902         }
 903         if (*offset == 0)
 904                 strcpy(buffer, tmp);
 905         else {
 906                 strcat(buffer, ";");
 907                 strcat(buffer, tmp);
 908         }
 909
 910         *offset += strlen(str) + 1;
 911
 912         return 0;
 913 }
 914
 915 static int
 916 kvp_get_ip_info(int family, char *if_name, int op,
 917                  void  *out_buffer, int length)
 918 {
 919         struct ifaddrs *ifap;
 920         struct ifaddrs *curp;
 921         int offset = 0;
 922         int sn_offset = 0;
 923         int error = 0;
 924         char *buffer;
 925         struct hv_kvp_ipaddr_value *ip_buffer;
 926         char cidr_mask[5]; /* /xyz */
 927         int weight;
 928         int i;
 929         unsigned int *w;
 930         char *sn_str;
 931         struct sockaddr_in6 *addr6;
 932
 933         if (op == KVP_OP_ENUMERATE) {
 934                 buffer = out_buffer;
 935         } else {
 936                 ip_buffer = out_buffer;
 937                 buffer = (char *)ip_buffer->ip_addr;
 938                 ip_buffer->addr_family = 0;
 939         }
 940         /*
 941          * On entry into this function, the buffer is capable of holding the
 942          * maximum key value.
 943          */
 944
 945         if (getifaddrs(&ifap)) {
 946                 strcpy(buffer, "getifaddrs failed\n");
 947                 return HV_E_FAIL;
 948         }
 949
 950         curp = ifap;
 951         while (curp != NULL) {
 952                 if (curp->ifa_addr == NULL) {
 953                         curp = curp->ifa_next;
 954                         continue;
 955                 }
 956
 957                 if ((if_name != NULL) &&
 958                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 959                         /*
 960                          * We want info about a specific interface;
 961                          * just continue.
 962                          */
 963                         curp = curp->ifa_next;
 964                         continue;
 965                 }
 966
 967                 /*
 968                  * We only support two address families: AF_INET and AF_INET6.
 969                  * If a family value of 0 is specified, we collect both
 970                  * supported address families; if not we gather info on
 971                  * the specified address family.
 972                  */
 973                 if ((((family != 0) &&
 974                          (curp->ifa_addr->sa_family != family))) ||
 975                          (curp->ifa_flags & IFF_LOOPBACK)) {
 976                         curp = curp->ifa_next;
 977                         continue;
 978                 }
 979                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 980                         (curp->ifa_addr->sa_family != AF_INET6)) {
 981                         curp = curp->ifa_next;
 982                         continue;
 983                 }
 984
 985                 if (op == KVP_OP_GET_IP_INFO) {
 986                         /*
 987                          * Gather info other than the IP address.
 988                          * IP address info will be gathered later.
 989                          */
 990                         if (curp->ifa_addr->sa_family == AF_INET) {
 991                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 992                                 /*
 993                                  * Get subnet info.
 994                                  */
 995                                 error = kvp_process_ip_address(
 996                                                              curp->ifa_netmask,
 997                                                              AF_INET,
 998                                                              (char *)
 999                                                              ip_buffer->sub_net,
1000                                                              length,
1001                                                              &sn_offset);
1002                                 if (error)
1003                                         goto gather_ipaddr;
1004                         } else {
1005                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1006
1007                                 /*
1008                                  * Get subnet info in CIDR format.
1009                                  */
1010                                 weight = 0;
1011                                 sn_str = (char *)ip_buffer->sub_net;
1012                                 addr6 = (struct sockaddr_in6 *)
1013                                         curp->ifa_netmask;
1014                                 w = addr6->sin6_addr.s6_addr32;
1015
1016                                 for (i = 0; i < 4; i++)
1017                                         weight += hweight32(&w[i]);
1018
1019                                 sprintf(cidr_mask, "/%d", weight);
1020                                 if ((length - sn_offset) <
1021                                         (strlen(cidr_mask) + 1))
1022                                         goto gather_ipaddr;
1023
1024                                 if (sn_offset == 0)
1025                                         strcpy(sn_str, cidr_mask);
1026                                 else {
1027                                         strcat((char *)ip_buffer->sub_net, ";");
1028                                         strcat(sn_str, cidr_mask);
1029                                 }
1030                                 sn_offset += strlen(sn_str) + 1;
1031                         }
1032
1033                         /*
1034                          * Collect other ip related configuration info.
1035                          */
1036
1037                         kvp_get_ipconfig_info(if_name, ip_buffer);
1038                 }
1039
1040 gather_ipaddr:
1041                 error = kvp_process_ip_address(curp->ifa_addr,
1042                                                 curp->ifa_addr->sa_family,
1043                                                 buffer,
1044                                                 length, &offset);
1045                 if (error)
1046                         goto getaddr_done;
1047
1048                 curp = curp->ifa_next;
1049         }
1050
1051 getaddr_done:
1052         freeifaddrs(ifap);
1053         return error;
1054 }
1055
1056
1057 static int expand_ipv6(char *addr, int type)
1058 {
1059         int ret;
1060         struct in6_addr v6_addr;
1061
1062         ret = inet_pton(AF_INET6, addr, &v6_addr);
1063
1064         if (ret != 1) {
1065                 if (type == NETMASK)
1066                         return 1;
1067                 return 0;
1068         }
1069
1070         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1071                 "%02x%02x:%02x%02x:%02x%02x",
1072                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1073                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1074                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1075                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1076                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1077                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1078                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1079                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1080
1081         return 1;
1082
1083 }
1084
1085 static int is_ipv4(char *addr)
1086 {
1087         int ret;
1088         struct in_addr ipv4_addr;
1089
1090         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1091
1092         if (ret == 1)
1093                 return 1;
1094         return 0;
1095 }
1096
1097 static int parse_ip_val_buffer(char *in_buf, int *offset,
1098                                 char *out_buf, int out_len)
1099 {
1100         char *x;
1101         char *start;
1102
1103         /*
1104          * in_buf has sequence of characters that are seperated by
1105          * the character ';'. The last sequence does not have the
1106          * terminating ";" character.
1107          */
1108         start = in_buf + *offset;
1109
1110         x = strchr(start, ';');
1111         if (x)
1112                 *x = 0;
1113         else
1114                 x = start + strlen(start);
1115
1116         if (strlen(start) != 0) {
1117                 int i = 0;
1118                 /*
1119                  * Get rid of leading spaces.
1120                  */
1121                 while (start[i] == ' ')
1122                         i++;
1123
1124                 if ((x - start) <= out_len) {
1125                         strcpy(out_buf, (start + i));
1126                         *offset += (x - start) + 1;
1127                         return 1;
1128                 }
1129         }
1130         return 0;
1131 }
1132
1133 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1134 {
1135         int ret;
1136
1137         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1138
1139         if (ret < 0)
1140                 return HV_E_FAIL;
1141
1142         return 0;
1143 }
1144
1145
1146 static int process_ip_string(FILE *f, char *ip_string, int type)
1147 {
1148         int error = 0;
1149         char addr[INET6_ADDRSTRLEN];
1150         int i = 0;
1151         int j = 0;
1152         char str[256];
1153         char sub_str[10];
1154         int offset = 0;
1155
1156         memset(addr, 0, sizeof(addr));
1157
1158         while (parse_ip_val_buffer(ip_string, &offset, addr,
1159                                         (MAX_IP_ADDR_SIZE * 2))) {
1160
1161                 sub_str[0] = 0;
1162                 if (is_ipv4(addr)) {
1163                         switch (type) {
1164                         case IPADDR:
1165                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1166                                 break;
1167                         case NETMASK:
1168                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1169                                 break;
1170                         case GATEWAY:
1171                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1172                                 break;
1173                         case DNS:
1174                                 snprintf(str, sizeof(str), "%s", "DNS");
1175                                 break;
1176                         }
1177
1178                         if (type == DNS) {
1179                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1180                         } else if (type == GATEWAY && i == 0) {
1181                                 ++i;
1182                         } else {
1183                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1184                         }
1185
1186
1187                 } else if (expand_ipv6(addr, type)) {
1188                         switch (type) {
1189                         case IPADDR:
1190                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1191                                 break;
1192                         case NETMASK:
1193                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1194                                 break;
1195                         case GATEWAY:
1196                                 snprintf(str, sizeof(str), "%s",
1197                                         "IPV6_DEFAULTGW");
1198                                 break;
1199                         case DNS:
1200                                 snprintf(str, sizeof(str), "%s",  "DNS");
1201                                 break;
1202                         }
1203
1204                         if (type == DNS) {
1205                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1206                         } else if (j == 0) {
1207                                 ++j;
1208                         } else {
1209                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1210                         }
1211                 } else {
1212                         return  HV_INVALIDARG;
1213                 }
1214
1215                 error = kvp_write_file(f, str, sub_str, addr);
1216                 if (error)
1217                         return error;
1218                 memset(addr, 0, sizeof(addr));
1219         }
1220
1221         return 0;
1222 }
1223
1224 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1225 {
1226         int error = 0;
1227         char if_file[128];
1228         FILE *file;
1229         char cmd[512];
1230         char *mac_addr;
1231
1232         /*
1233          * Set the configuration for the specified interface with
1234          * the information provided. Since there is no standard
1235          * way to configure an interface, we will have an external
1236          * script that does the job of configuring the interface and
1237          * flushing the configuration.
1238          *
1239          * The parameters passed to this external script are:
1240          * 1. A configuration file that has the specified configuration.
1241          *
1242          * We will embed the name of the interface in the configuration
1243          * file: ifcfg-ethx (where ethx is the interface name).
1244          *
1245          * The information provided here may be more than what is needed
1246          * in a given distro to configure the interface and so are free
1247          * ignore information that may not be relevant.
1248          *
1249          * Here is the format of the ip configuration file:
1250          *
1251          * HWADDR=macaddr
1252          * DEVICE=interface name
1253          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1254          *                       or "none" if no boot-time protocol should be used)
1255          *
1256          * IPADDR0=ipaddr1
1257          * IPADDR1=ipaddr2
1258          * IPADDRx=ipaddry (where y = x + 1)
1259          *
1260          * NETMASK0=netmask1
1261          * NETMASKx=netmasky (where y = x + 1)
1262          *
1263          * GATEWAY=ipaddr1
1264          * GATEWAYx=ipaddry (where y = x + 1)
1265          *
1266          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1267          *
1268          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1269          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1270          * IPV6NETMASK.
1271          *
1272          * The host can specify multiple ipv4 and ipv6 addresses to be
1273          * configured for the interface. Furthermore, the configuration
1274          * needs to be persistent. A subsequent GET call on the interface
1275          * is expected to return the configuration that is set via the SET
1276          * call.
1277          */
1278
1279         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1280                 "/ifcfg-", if_name);
1281
1282         file = fopen(if_file, "w");
1283
1284         if (file == NULL) {
1285                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1286                                 errno, strerror(errno));
1287                 return HV_E_FAIL;
1288         }
1289
1290         /*
1291          * First write out the MAC address.
1292          */
1293
1294         mac_addr = kvp_if_name_to_mac(if_name);
1295         if (mac_addr == NULL) {
1296                 error = HV_E_FAIL;
1297                 goto setval_error;
1298         }
1299
1300         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1301         free(mac_addr);
1302         if (error)
1303                 goto setval_error;
1304
1305         error = kvp_write_file(file, "DEVICE", "", if_name);
1306         if (error)
1307                 goto setval_error;
1308
1309         /*
1310          * The dhcp_enabled flag is only for IPv4. In the case the host only
1311          * injects an IPv6 address, the flag is true, but we still need to
1312          * proceed to parse and pass the IPv6 information to the
1313          * disto-specific script hv_set_ifconfig.
1314          */
1315         if (new_val->dhcp_enabled) {
1316                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1317                 if (error)
1318                         goto setval_error;
1319
1320         } else {
1321                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1322                 if (error)
1323                         goto setval_error;
1324         }
1325
1326         /*
1327          * Write the configuration for ipaddress, netmask, gateway and
1328          * name servers.
1329          */
1330
1331         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1332         if (error)
1333                 goto setval_error;
1334
1335         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1336         if (error)
1337                 goto setval_error;
1338
1339         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1340         if (error)
1341                 goto setval_error;
1342
1343         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1344         if (error)
1345                 goto setval_error;
1346
1347         fclose(file);
1348
1349         /*
1350          * Now that we have populated the configuration file,
1351          * invoke the external script to do its magic.
1352          */
1353
1354         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1355         if (system(cmd)) {
1356                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1357                                 cmd, errno, strerror(errno));
1358                 return HV_E_FAIL;
1359         }
1360         return 0;
1361
1362 setval_error:
1363         syslog(LOG_ERR, "Failed to write config file");
1364         fclose(file);
1365         return error;
1366 }
1367
1368
1369 static void
1370 kvp_get_domain_name(char *buffer, int length)
1371 {
1372         struct addrinfo hints, *info ;
1373         int error = 0;
1374
1375         gethostname(buffer, length);
1376         memset(&hints, 0, sizeof(hints));
1377         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1378         hints.ai_socktype = SOCK_STREAM;
1379         hints.ai_flags = AI_CANONNAME;
1380
1381         error = getaddrinfo(buffer, NULL, &hints, &info);
1382         if (error != 0) {
1383                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1384                         error, gai_strerror(error));
1385                 return;
1386         }
1387         snprintf(buffer, length, "%s", info->ai_canonname);
1388         freeaddrinfo(info);
1389 }
1390
1391 static int
1392 netlink_send(int fd, struct cn_msg *msg)
1393 {
1394         struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
1395         unsigned int size;
1396         struct msghdr message;
1397         struct iovec iov[2];
1398
1399         size = sizeof(struct cn_msg) + msg->len;
1400
1401         nlh.nlmsg_pid = getpid();
1402         nlh.nlmsg_len = NLMSG_LENGTH(size);
1403
1404         iov[0].iov_base = &nlh;
1405         iov[0].iov_len = sizeof(nlh);
1406
1407         iov[1].iov_base = msg;
1408         iov[1].iov_len = size;
1409
1410         memset(&message, 0, sizeof(message));
1411         message.msg_name = &addr;
1412         message.msg_namelen = sizeof(addr);
1413         message.msg_iov = iov;
1414         message.msg_iovlen = 2;
1415
1416         return sendmsg(fd, &message, 0);
1417 }
1418
1419 void print_usage(char *argv[])
1420 {
1421         fprintf(stderr, "Usage: %s [options]\n"
1422                 "Options are:\n"
1423                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1424                 "  -h, --help             print this help\n", argv[0]);
1425 }
1426
1427 int main(int argc, char *argv[])
1428 {
1429         int fd, len, nl_group;
1430         int error;
1431         struct cn_msg *message;
1432         struct pollfd pfd;
1433         struct nlmsghdr *incoming_msg;
1434         struct cn_msg   *incoming_cn_msg;
1435         struct hv_kvp_msg *hv_msg;
1436         char    *p;
1437         char    *key_value;
1438         char    *key_name;
1439         int     op;
1440         int     pool;
1441         char    *if_name;
1442         struct hv_kvp_ipaddr_value *kvp_ip_val;
1443         char *kvp_recv_buffer;
1444         size_t kvp_recv_buffer_len;
1445         int daemonize = 1, long_index = 0, opt;
1446
1447         static struct option long_options[] = {
1448                 {"help",        no_argument,       0,  'h' },
1449                 {"no-daemon",   no_argument,       0,  'n' },
1450                 {0,             0,                 0,  0   }
1451         };
1452
1453         while ((opt = getopt_long(argc, argv, "hn", long_options,
1454                                   &long_index)) != -1) {
1455                 switch (opt) {
1456                 case 'n':
1457                         daemonize = 0;
1458                         break;
1459                 case 'h':
1460                 default:
1461                         print_usage(argv);
1462                         exit(EXIT_FAILURE);
1463                 }
1464         }
1465
1466         if (daemonize && daemon(1, 0))
1467                 return 1;
1468
1469         openlog("KVP", 0, LOG_USER);
1470         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1471
1472         kvp_recv_buffer_len = NLMSG_LENGTH(0) + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
1473         kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
1474         if (!kvp_recv_buffer) {
1475                 syslog(LOG_ERR, "Failed to allocate netlink buffer");
1476                 exit(EXIT_FAILURE);
1477         }
1478         /*
1479          * Retrieve OS release information.
1480          */
1481         kvp_get_os_info();
1482         /*
1483          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1484          * unpredictable amount of time to finish.
1485          */
1486         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1487
1488         if (kvp_file_init()) {
1489                 syslog(LOG_ERR, "Failed to initialize the pools");
1490                 exit(EXIT_FAILURE);
1491         }
1492
1493         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1494         if (fd < 0) {
1495                 syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
1496                                 strerror(errno));
1497                 exit(EXIT_FAILURE);
1498         }
1499         addr.nl_family = AF_NETLINK;
1500         addr.nl_pad = 0;
1501         addr.nl_pid = 0;
1502         addr.nl_groups = 0;
1503
1504
1505         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1506         if (error < 0) {
1507                 syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
1508                 close(fd);
1509                 exit(EXIT_FAILURE);
1510         }
1511         nl_group = CN_KVP_IDX;
1512
1513         if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
1514                 syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
1515                 close(fd);
1516                 exit(EXIT_FAILURE);
1517         }
1518
1519         /*
1520          * Register ourselves with the kernel.
1521          */
1522         message = (struct cn_msg *)kvp_recv_buffer;
1523         message->id.idx = CN_KVP_IDX;
1524         message->id.val = CN_KVP_VAL;
1525
1526         hv_msg = (struct hv_kvp_msg *)message->data;
1527         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1528         message->ack = 0;
1529         message->len = sizeof(struct hv_kvp_msg);
1530
1531         len = netlink_send(fd, message);
1532         if (len < 0) {
1533                 syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
1534                 close(fd);
1535                 exit(EXIT_FAILURE);
1536         }
1537
1538         pfd.fd = fd;
1539
1540         while (1) {
1541                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1542                 socklen_t addr_l = sizeof(addr);
1543                 pfd.events = POLLIN;
1544                 pfd.revents = 0;
1545
1546                 if (poll(&pfd, 1, -1) < 0) {
1547                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1548                         if (errno == EINVAL) {
1549                                 close(fd);
1550                                 exit(EXIT_FAILURE);
1551                         }
1552                         else
1553                                 continue;
1554                 }
1555
1556                 len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
1557                                 addr_p, &addr_l);
1558
1559                 if (len < 0) {
1560                         int saved_errno = errno;
1561                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1562                                         addr.nl_pid, errno, strerror(errno));
1563
1564                         if (saved_errno == ENOBUFS) {
1565                                 syslog(LOG_ERR, "receive error: ignored");
1566                                 continue;
1567                         }
1568
1569                         close(fd);
1570                         return -1;
1571                 }
1572
1573                 if (addr.nl_pid) {
1574                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1575                                         addr.nl_pid);
1576                         continue;
1577                 }
1578
1579                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1580
1581                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1582                         continue;
1583
1584                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1585                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1586
1587                 /*
1588                  * We will use the KVP header information to pass back
1589                  * the error from this daemon. So, first copy the state
1590                  * and set the error code to success.
1591                  */
1592                 op = hv_msg->kvp_hdr.operation;
1593                 pool = hv_msg->kvp_hdr.pool;
1594                 hv_msg->error = HV_S_OK;
1595
1596                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1597                         /*
1598                          * Driver is registering with us; stash away the version
1599                          * information.
1600                          */
1601                         in_hand_shake = 0;
1602                         p = (char *)hv_msg->body.kvp_register.version;
1603                         lic_version = malloc(strlen(p) + 1);
1604                         if (lic_version) {
1605                                 strcpy(lic_version, p);
1606                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1607                                         lic_version);
1608                         } else {
1609                                 syslog(LOG_ERR, "malloc failed");
1610                         }
1611                         continue;
1612                 }
1613
1614                 switch (op) {
1615                 case KVP_OP_GET_IP_INFO:
1616                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1617                         if_name =
1618                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1619
1620                         if (if_name == NULL) {
1621                                 /*
1622                                  * We could not map the mac address to an
1623                                  * interface name; return error.
1624                                  */
1625                                 hv_msg->error = HV_E_FAIL;
1626                                 break;
1627                         }
1628                         error = kvp_get_ip_info(
1629                                                 0, if_name, KVP_OP_GET_IP_INFO,
1630                                                 kvp_ip_val,
1631                                                 (MAX_IP_ADDR_SIZE * 2));
1632
1633                         if (error)
1634                                 hv_msg->error = error;
1635
1636                         free(if_name);
1637                         break;
1638
1639                 case KVP_OP_SET_IP_INFO:
1640                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1641                         if_name = kvp_get_if_name(
1642                                         (char *)kvp_ip_val->adapter_id);
1643                         if (if_name == NULL) {
1644                                 /*
1645                                  * We could not map the guid to an
1646                                  * interface name; return error.
1647                                  */
1648                                 hv_msg->error = HV_GUID_NOTFOUND;
1649                                 break;
1650                         }
1651                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1652                         if (error)
1653                                 hv_msg->error = error;
1654
1655                         free(if_name);
1656                         break;
1657
1658                 case KVP_OP_SET:
1659                         if (kvp_key_add_or_modify(pool,
1660                                         hv_msg->body.kvp_set.data.key,
1661                                         hv_msg->body.kvp_set.data.key_size,
1662                                         hv_msg->body.kvp_set.data.value,
1663                                         hv_msg->body.kvp_set.data.value_size))
1664                                         hv_msg->error = HV_S_CONT;
1665                         break;
1666
1667                 case KVP_OP_GET:
1668                         if (kvp_get_value(pool,
1669                                         hv_msg->body.kvp_set.data.key,
1670                                         hv_msg->body.kvp_set.data.key_size,
1671                                         hv_msg->body.kvp_set.data.value,
1672                                         hv_msg->body.kvp_set.data.value_size))
1673                                         hv_msg->error = HV_S_CONT;
1674                         break;
1675
1676                 case KVP_OP_DELETE:
1677                         if (kvp_key_delete(pool,
1678                                         hv_msg->body.kvp_delete.key,
1679                                         hv_msg->body.kvp_delete.key_size))
1680                                         hv_msg->error = HV_S_CONT;
1681                         break;
1682
1683                 default:
1684                         break;
1685                 }
1686
1687                 if (op != KVP_OP_ENUMERATE)
1688                         goto kvp_done;
1689
1690                 /*
1691                  * If the pool is KVP_POOL_AUTO, dynamically generate
1692                  * both the key and the value; if not read from the
1693                  * appropriate pool.
1694                  */
1695                 if (pool != KVP_POOL_AUTO) {
1696                         if (kvp_pool_enumerate(pool,
1697                                         hv_msg->body.kvp_enum_data.index,
1698                                         hv_msg->body.kvp_enum_data.data.key,
1699                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1700                                         hv_msg->body.kvp_enum_data.data.value,
1701                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1702                                         hv_msg->error = HV_S_CONT;
1703                         goto kvp_done;
1704                 }
1705
1706                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1707                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1708                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1709
1710                 switch (hv_msg->body.kvp_enum_data.index) {
1711                 case FullyQualifiedDomainName:
1712                         strcpy(key_value, full_domain_name);
1713                         strcpy(key_name, "FullyQualifiedDomainName");
1714                         break;
1715                 case IntegrationServicesVersion:
1716                         strcpy(key_name, "IntegrationServicesVersion");
1717                         strcpy(key_value, lic_version);
1718                         break;
1719                 case NetworkAddressIPv4:
1720                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1721                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1722                         strcpy(key_name, "NetworkAddressIPv4");
1723                         break;
1724                 case NetworkAddressIPv6:
1725                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1726                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1727                         strcpy(key_name, "NetworkAddressIPv6");
1728                         break;
1729                 case OSBuildNumber:
1730                         strcpy(key_value, os_build);
1731                         strcpy(key_name, "OSBuildNumber");
1732                         break;
1733                 case OSName:
1734                         strcpy(key_value, os_name);
1735                         strcpy(key_name, "OSName");
1736                         break;
1737                 case OSMajorVersion:
1738                         strcpy(key_value, os_major);
1739                         strcpy(key_name, "OSMajorVersion");
1740                         break;
1741                 case OSMinorVersion:
1742                         strcpy(key_value, os_minor);
1743                         strcpy(key_name, "OSMinorVersion");
1744                         break;
1745                 case OSVersion:
1746                         strcpy(key_value, os_version);
1747                         strcpy(key_name, "OSVersion");
1748                         break;
1749                 case ProcessorArchitecture:
1750                         strcpy(key_value, processor_arch);
1751                         strcpy(key_name, "ProcessorArchitecture");
1752                         break;
1753                 default:
1754                         hv_msg->error = HV_S_CONT;
1755                         break;
1756                 }
1757                 /*
1758                  * Send the value back to the kernel. The response is
1759                  * already in the receive buffer. Update the cn_msg header to
1760                  * reflect the key value that has been added to the message
1761                  */
1762 kvp_done:
1763
1764                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1765                 incoming_cn_msg->id.val = CN_KVP_VAL;
1766                 incoming_cn_msg->ack = 0;
1767                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1768
1769                 len = netlink_send(fd, incoming_cn_msg);
1770                 if (len < 0) {
1771                         int saved_errno = errno;
1772                         syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
1773                                         strerror(errno));
1774
1775                         if (saved_errno == ENOMEM || saved_errno == ENOBUFS) {
1776                                 syslog(LOG_ERR, "send error: ignored");
1777                                 continue;
1778                         }
1779
1780                         exit(EXIT_FAILURE);
1781                 }
1782         }
1783
1784 }