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/poll.h>
  26 #include <sys/utsname.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #include <arpa/inet.h>
  34 #include <linux/hyperv.h>
  35 #include <ifaddrs.h>
  36 #include <netdb.h>
  37 #include <syslog.h>
  38 #include <sys/stat.h>
  39 #include <fcntl.h>
  40 #include <dirent.h>
  41 #include <net/if.h>
  42 #include <limits.h>
  43 #include <getopt.h>
  44
  45 /*
  46  * KVP protocol: The user mode component first registers with the
  47  * kernel component. Subsequently, the kernel component requests, data
  48  * for the specified keys. In response to this message the user mode component
  49  * fills in the value corresponding to the specified key. We overload the
  50  * sequence field in the cn_msg header to define our KVP message types.
  51  *
  52  * We use this infrastructure for also supporting queries from user mode
  53  * application for state that may be maintained in the KVP kernel component.
  54  *
  55  */
  56
  57
  58 enum key_index {
  59         FullyQualifiedDomainName = 0,
  60         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  61         NetworkAddressIPv4,
  62         NetworkAddressIPv6,
  63         OSBuildNumber,
  64         OSName,
  65         OSMajorVersion,
  66         OSMinorVersion,
  67         OSVersion,
  68         ProcessorArchitecture
  69 };
  70
  71
  72 enum {
  73         IPADDR = 0,
  74         NETMASK,
  75         GATEWAY,
  76         DNS
  77 };
  78
  79 enum {
  80         IPV4 = 1,
  81         IPV6,
  82         IP_TYPE_MAX
  83 };
  84
  85 static int in_hand_shake;
  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 char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
  95 static struct utsname uts_buf;
  96
  97 /*
  98  * The location of the interface configuration file.
  99  */
 100
 101 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 102
 103 #ifndef KVP_SCRIPTS_PATH
 104 #define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
 105 #endif
 106
 107 #define KVP_NET_DIR "/sys/class/net/"
 108
 109 #define MAX_FILE_NAME 100
 110 #define ENTRIES_PER_BLOCK 50
 111 /*
 112  * Change this entry if the number of addresses increases in future
 113  */
 114 #define MAX_IP_ENTRIES 64
 115 #define OUTSTR_BUF_SIZE ((INET6_ADDRSTRLEN + 1) * MAX_IP_ENTRIES)
 116
 117 struct kvp_record {
 118         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 119         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 120 };
 121
 122 struct kvp_file_state {
 123         int fd;
 124         int num_blocks;
 125         struct kvp_record *records;
 126         int num_records;
 127         char fname[MAX_FILE_NAME];
 128 };
 129
 130 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
 131
 132 static void kvp_acquire_lock(int pool)
 133 {
 134         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
 135         fl.l_pid = getpid();
 136
 137         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
 138                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
 139                                 errno, strerror(errno));
 140                 exit(EXIT_FAILURE);
 141         }
 142 }
 143
 144 static void kvp_release_lock(int pool)
 145 {
 146         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
 147         fl.l_pid = getpid();
 148
 149         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
 150                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
 151                                 errno, strerror(errno));
 152                 exit(EXIT_FAILURE);
 153         }
 154 }
 155
 156 static void kvp_update_file(int pool)
 157 {
 158         FILE *filep;
 159
 160         /*
 161          * We are going to write our in-memory registry out to
 162          * disk; acquire the lock first.
 163          */
 164         kvp_acquire_lock(pool);
 165
 166         filep = fopen(kvp_file_info[pool].fname, "we");
 167         if (!filep) {
 168                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 169                                 errno, strerror(errno));
 170                 kvp_release_lock(pool);
 171                 exit(EXIT_FAILURE);
 172         }
 173
 174         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
 175                                 kvp_file_info[pool].num_records, filep);
 176
 177         if (ferror(filep) || fclose(filep)) {
 178                 kvp_release_lock(pool);
 179                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
 180                 exit(EXIT_FAILURE);
 181         }
 182
 183         kvp_release_lock(pool);
 184 }
 185
 186 static void kvp_update_mem_state(int pool)
 187 {
 188         FILE *filep;
 189         size_t records_read = 0;
 190         struct kvp_record *record = kvp_file_info[pool].records;
 191         struct kvp_record *readp;
 192         int num_blocks = kvp_file_info[pool].num_blocks;
 193         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 194
 195         kvp_acquire_lock(pool);
 196
 197         filep = fopen(kvp_file_info[pool].fname, "re");
 198         if (!filep) {
 199                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
 200                                 errno, strerror(errno));
 201                 kvp_release_lock(pool);
 202                 exit(EXIT_FAILURE);
 203         }
 204         for (;;) {
 205                 readp = &record[records_read];
 206                 records_read += fread(readp, sizeof(struct kvp_record),
 207                                 ENTRIES_PER_BLOCK * num_blocks - records_read,
 208                                 filep);
 209
 210                 if (ferror(filep)) {
 211                         syslog(LOG_ERR,
 212                                 "Failed to read file, pool: %d; error: %d %s",
 213                                  pool, errno, strerror(errno));
 214                         kvp_release_lock(pool);
 215                         exit(EXIT_FAILURE);
 216                 }
 217
 218                 if (!feof(filep)) {
 219                         /*
 220                          * We have more data to read.
 221                          */
 222                         num_blocks++;
 223                         record = realloc(record, alloc_unit * num_blocks);
 224
 225                         if (record == NULL) {
 226                                 syslog(LOG_ERR, "malloc failed");
 227                                 kvp_release_lock(pool);
 228                                 exit(EXIT_FAILURE);
 229                         }
 230                         continue;
 231                 }
 232                 break;
 233         }
 234
 235         kvp_file_info[pool].num_blocks = num_blocks;
 236         kvp_file_info[pool].records = record;
 237         kvp_file_info[pool].num_records = records_read;
 238
 239         fclose(filep);
 240         kvp_release_lock(pool);
 241 }
 242
 243 static int kvp_file_init(void)
 244 {
 245         int  fd;
 246         char *fname;
 247         int i;
 248         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
 249
 250         if (access(KVP_CONFIG_LOC, F_OK)) {
 251                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
 252                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
 253                                         errno, strerror(errno));
 254                         exit(EXIT_FAILURE);
 255                 }
 256         }
 257
 258         for (i = 0; i < KVP_POOL_COUNT; i++) {
 259                 fname = kvp_file_info[i].fname;
 260                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
 261                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
 262
 263                 if (fd == -1)
 264                         return 1;
 265
 266                 kvp_file_info[i].fd = fd;
 267                 kvp_file_info[i].num_blocks = 1;
 268                 kvp_file_info[i].records = malloc(alloc_unit);
 269                 if (kvp_file_info[i].records == NULL)
 270                         return 1;
 271                 kvp_file_info[i].num_records = 0;
 272                 kvp_update_mem_state(i);
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
 279 {
 280         int i;
 281         int j, k;
 282         int num_records;
 283         struct kvp_record *record;
 284
 285         /*
 286          * First update the in-memory state.
 287          */
 288         kvp_update_mem_state(pool);
 289
 290         num_records = kvp_file_info[pool].num_records;
 291         record = kvp_file_info[pool].records;
 292
 293         for (i = 0; i < num_records; i++) {
 294                 if (memcmp(key, record[i].key, key_size))
 295                         continue;
 296                 /*
 297                  * Found a match; just move the remaining
 298                  * entries up.
 299                  */
 300                 if (i == (num_records - 1)) {
 301                         kvp_file_info[pool].num_records--;
 302                         kvp_update_file(pool);
 303                         return 0;
 304                 }
 305
 306                 j = i;
 307                 k = j + 1;
 308                 for (; k < num_records; k++) {
 309                         strcpy(record[j].key, record[k].key);
 310                         strcpy(record[j].value, record[k].value);
 311                         j++;
 312                 }
 313
 314                 kvp_file_info[pool].num_records--;
 315                 kvp_update_file(pool);
 316                 return 0;
 317         }
 318         return 1;
 319 }
 320
 321 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
 322                                  const __u8 *value, int value_size)
 323 {
 324         int i;
 325         int num_records;
 326         struct kvp_record *record;
 327         int num_blocks;
 328
 329         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 330                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 331                 return 1;
 332
 333         /*
 334          * First update the in-memory state.
 335          */
 336         kvp_update_mem_state(pool);
 337
 338         num_records = kvp_file_info[pool].num_records;
 339         record = kvp_file_info[pool].records;
 340         num_blocks = kvp_file_info[pool].num_blocks;
 341
 342         for (i = 0; i < num_records; i++) {
 343                 if (memcmp(key, record[i].key, key_size))
 344                         continue;
 345                 /*
 346                  * Found a match; just update the value -
 347                  * this is the modify case.
 348                  */
 349                 memcpy(record[i].value, value, value_size);
 350                 kvp_update_file(pool);
 351                 return 0;
 352         }
 353
 354         /*
 355          * Need to add a new entry;
 356          */
 357         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
 358                 /* Need to allocate a larger array for reg entries. */
 359                 record = realloc(record, sizeof(struct kvp_record) *
 360                          ENTRIES_PER_BLOCK * (num_blocks + 1));
 361
 362                 if (record == NULL)
 363                         return 1;
 364                 kvp_file_info[pool].num_blocks++;
 365
 366         }
 367         memcpy(record[i].value, value, value_size);
 368         memcpy(record[i].key, key, key_size);
 369         kvp_file_info[pool].records = record;
 370         kvp_file_info[pool].num_records++;
 371         kvp_update_file(pool);
 372         return 0;
 373 }
 374
 375 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
 376                         int value_size)
 377 {
 378         int i;
 379         int num_records;
 380         struct kvp_record *record;
 381
 382         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
 383                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
 384                 return 1;
 385
 386         /*
 387          * First update the in-memory state.
 388          */
 389         kvp_update_mem_state(pool);
 390
 391         num_records = kvp_file_info[pool].num_records;
 392         record = kvp_file_info[pool].records;
 393
 394         for (i = 0; i < num_records; i++) {
 395                 if (memcmp(key, record[i].key, key_size))
 396                         continue;
 397                 /*
 398                  * Found a match; just copy the value out.
 399                  */
 400                 memcpy(value, record[i].value, value_size);
 401                 return 0;
 402         }
 403
 404         return 1;
 405 }
 406
 407 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
 408                                 __u8 *value, int value_size)
 409 {
 410         struct kvp_record *record;
 411
 412         /*
 413          * First update our in-memory database.
 414          */
 415         kvp_update_mem_state(pool);
 416         record = kvp_file_info[pool].records;
 417
 418         if (index >= kvp_file_info[pool].num_records) {
 419                 return 1;
 420         }
 421
 422         memcpy(key, record[index].key, key_size);
 423         memcpy(value, record[index].value, value_size);
 424         return 0;
 425 }
 426
 427
 428 void kvp_get_os_info(void)
 429 {
 430         FILE    *file;
 431         char    *p, buf[512];
 432
 433         uname(&uts_buf);
 434         os_version = uts_buf.release;
 435         os_build = strdup(uts_buf.release);
 436
 437         os_name = uts_buf.sysname;
 438         processor_arch = uts_buf.machine;
 439
 440         /*
 441          * The current windows host (win7) expects the build
 442          * string to be of the form: x.y.z
 443          * Strip additional information we may have.
 444          */
 445         p = strchr(os_version, '-');
 446         if (p)
 447                 *p = '\0';
 448
 449         /*
 450          * Parse the /etc/os-release file if present:
 451          * https://www.freedesktop.org/software/systemd/man/os-release.html
 452          */
 453         file = fopen("/etc/os-release", "r");
 454         if (file != NULL) {
 455                 while (fgets(buf, sizeof(buf), file)) {
 456                         char *value, *q;
 457
 458                         /* Ignore comments */
 459                         if (buf[0] == '#')
 460                                 continue;
 461
 462                         /* Split into name=value */
 463                         p = strchr(buf, '=');
 464                         if (!p)
 465                                 continue;
 466                         *p++ = 0;
 467
 468                         /* Remove quotes and newline; un-escape */
 469                         value = p;
 470                         q = p;
 471                         while (*p) {
 472                                 if (*p == '\\') {
 473                                         ++p;
 474                                         if (!*p)
 475                                                 break;
 476                                         *q++ = *p++;
 477                                 } else if (*p == '\'' || *p == '"' ||
 478                                            *p == '\n') {
 479                                         ++p;
 480                                 } else {
 481                                         *q++ = *p++;
 482                                 }
 483                         }
 484                         *q = 0;
 485
 486                         if (!strcmp(buf, "NAME")) {
 487                                 p = strdup(value);
 488                                 if (!p)
 489                                         break;
 490                                 os_name = p;
 491                         } else if (!strcmp(buf, "VERSION_ID")) {
 492                                 p = strdup(value);
 493                                 if (!p)
 494                                         break;
 495                                 os_major = p;
 496                         }
 497                 }
 498                 fclose(file);
 499                 return;
 500         }
 501
 502         /* Fallback for older RH/SUSE releases */
 503         file = fopen("/etc/SuSE-release", "r");
 504         if (file != NULL)
 505                 goto kvp_osinfo_found;
 506         file  = fopen("/etc/redhat-release", "r");
 507         if (file != NULL)
 508                 goto kvp_osinfo_found;
 509
 510         /*
 511          * We don't have information about the os.
 512          */
 513         return;
 514
 515 kvp_osinfo_found:
 516         /* up to three lines */
 517         p = fgets(buf, sizeof(buf), file);
 518         if (p) {
 519                 p = strchr(buf, '\n');
 520                 if (p)
 521                         *p = '\0';
 522                 p = strdup(buf);
 523                 if (!p)
 524                         goto done;
 525                 os_name = p;
 526
 527                 /* second line */
 528                 p = fgets(buf, sizeof(buf), file);
 529                 if (p) {
 530                         p = strchr(buf, '\n');
 531                         if (p)
 532                                 *p = '\0';
 533                         p = strdup(buf);
 534                         if (!p)
 535                                 goto done;
 536                         os_major = p;
 537
 538                         /* third line */
 539                         p = fgets(buf, sizeof(buf), file);
 540                         if (p)  {
 541                                 p = strchr(buf, '\n');
 542                                 if (p)
 543                                         *p = '\0';
 544                                 p = strdup(buf);
 545                                 if (p)
 546                                         os_minor = p;
 547                         }
 548                 }
 549         }
 550
 551 done:
 552         fclose(file);
 553         return;
 554 }
 555
 556
 557
 558 /*
 559  * Retrieve an interface name corresponding to the specified guid.
 560  * If there is a match, the function returns a pointer
 561  * to the interface name and if not, a NULL is returned.
 562  * If a match is found, the caller is responsible for
 563  * freeing the memory.
 564  */
 565
 566 static char *kvp_get_if_name(char *guid)
 567 {
 568         DIR *dir;
 569         struct dirent *entry;
 570         FILE    *file;
 571         char    *p, *x;
 572         char    *if_name = NULL;
 573         char    buf[256];
 574         char dev_id[PATH_MAX];
 575
 576         dir = opendir(KVP_NET_DIR);
 577         if (dir == NULL)
 578                 return NULL;
 579
 580         while ((entry = readdir(dir)) != NULL) {
 581                 /*
 582                  * Set the state for the next pass.
 583                  */
 584                 snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
 585                          KVP_NET_DIR, entry->d_name);
 586
 587                 file = fopen(dev_id, "r");
 588                 if (file == NULL)
 589                         continue;
 590
 591                 p = fgets(buf, sizeof(buf), file);
 592                 if (p) {
 593                         x = strchr(p, '\n');
 594                         if (x)
 595                                 *x = '\0';
 596
 597                         if (!strcmp(p, guid)) {
 598                                 /*
 599                                  * Found the guid match; return the interface
 600                                  * name. The caller will free the memory.
 601                                  */
 602                                 if_name = strdup(entry->d_name);
 603                                 fclose(file);
 604                                 break;
 605                         }
 606                 }
 607                 fclose(file);
 608         }
 609
 610         closedir(dir);
 611         return if_name;
 612 }
 613
 614 /*
 615  * Retrieve the MAC address given the interface name.
 616  */
 617
 618 static char *kvp_if_name_to_mac(char *if_name)
 619 {
 620         FILE    *file;
 621         char    *p, *x;
 622         char    buf[256];
 623         char addr_file[PATH_MAX];
 624         unsigned int i;
 625         char *mac_addr = NULL;
 626
 627         snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
 628                  if_name, "/address");
 629
 630         file = fopen(addr_file, "r");
 631         if (file == NULL)
 632                 return NULL;
 633
 634         p = fgets(buf, sizeof(buf), file);
 635         if (p) {
 636                 x = strchr(p, '\n');
 637                 if (x)
 638                         *x = '\0';
 639                 for (i = 0; i < strlen(p); i++)
 640                         p[i] = toupper(p[i]);
 641                 mac_addr = strdup(p);
 642         }
 643
 644         fclose(file);
 645         return mac_addr;
 646 }
 647
 648 static void kvp_process_ipconfig_file(char *cmd,
 649                                         char *config_buf, unsigned int len,
 650                                         int element_size, int offset)
 651 {
 652         char buf[256];
 653         char *p;
 654         char *x;
 655         FILE *file;
 656
 657         /*
 658          * First execute the command.
 659          */
 660         file = popen(cmd, "r");
 661         if (file == NULL)
 662                 return;
 663
 664         if (offset == 0)
 665                 memset(config_buf, 0, len);
 666         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
 667                 if (len < strlen(config_buf) + element_size + 1)
 668                         break;
 669
 670                 x = strchr(p, '\n');
 671                 if (x)
 672                         *x = '\0';
 673
 674                 strcat(config_buf, p);
 675                 strcat(config_buf, ";");
 676         }
 677         pclose(file);
 678 }
 679
 680 static void kvp_get_ipconfig_info(char *if_name,
 681                                  struct hv_kvp_ipaddr_value *buffer)
 682 {
 683         char cmd[512];
 684         char dhcp_info[128];
 685         char *p;
 686         FILE *file;
 687
 688         /*
 689          * Get the address of default gateway (ipv4).
 690          */
 691         sprintf(cmd, "%s %s", "ip route show dev", if_name);
 692         strcat(cmd, " | awk '/default/ {print $3 }'");
 693
 694         /*
 695          * Execute the command to gather gateway info.
 696          */
 697         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 698                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
 699
 700         /*
 701          * Get the address of default gateway (ipv6).
 702          */
 703         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
 704         strcat(cmd, " | awk '/default/ {print $3 }'");
 705
 706         /*
 707          * Execute the command to gather gateway info (ipv6).
 708          */
 709         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
 710                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
 711
 712
 713         /*
 714          * Gather the DNS state.
 715          * Since there is no standard way to get this information
 716          * across various distributions of interest; we just invoke
 717          * an external script that needs to be ported across distros
 718          * of interest.
 719          *
 720          * Following is the expected format of the information from the script:
 721          *
 722          * ipaddr1 (nameserver1)
 723          * ipaddr2 (nameserver2)
 724          * .
 725          * .
 726          */
 727
 728         sprintf(cmd, KVP_SCRIPTS_PATH "%s",  "hv_get_dns_info");
 729
 730         /*
 731          * Execute the command to gather DNS info.
 732          */
 733         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 734                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
 735
 736         /*
 737          * Gather the DHCP state.
 738          * We will gather this state by invoking an external script.
 739          * The parameter to the script is the interface name.
 740          * Here is the expected output:
 741          *
 742          * Enabled: DHCP enabled.
 743          */
 744
 745         sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dhcp_info", if_name);
 746
 747         file = popen(cmd, "r");
 748         if (file == NULL)
 749                 return;
 750
 751         p = fgets(dhcp_info, sizeof(dhcp_info), file);
 752         if (p == NULL) {
 753                 pclose(file);
 754                 return;
 755         }
 756
 757         if (!strncmp(p, "Enabled", 7))
 758                 buffer->dhcp_enabled = 1;
 759         else
 760                 buffer->dhcp_enabled = 0;
 761
 762         pclose(file);
 763 }
 764
 765
 766 static unsigned int hweight32(unsigned int *w)
 767 {
 768         unsigned int res = *w - ((*w >> 1) & 0x55555555);
 769         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 770         res = (res + (res >> 4)) & 0x0F0F0F0F;
 771         res = res + (res >> 8);
 772         return (res + (res >> 16)) & 0x000000FF;
 773 }
 774
 775 static int kvp_process_ip_address(void *addrp,
 776                                 int family, char *buffer,
 777                                 int length,  int *offset)
 778 {
 779         struct sockaddr_in *addr;
 780         struct sockaddr_in6 *addr6;
 781         int addr_length;
 782         char tmp[50];
 783         const char *str;
 784
 785         if (family == AF_INET) {
 786                 addr = addrp;
 787                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
 788                 addr_length = INET_ADDRSTRLEN;
 789         } else {
 790                 addr6 = addrp;
 791                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
 792                 addr_length = INET6_ADDRSTRLEN;
 793         }
 794
 795         if ((length - *offset) < addr_length + 2)
 796                 return HV_E_FAIL;
 797         if (str == NULL) {
 798                 strcpy(buffer, "inet_ntop failed\n");
 799                 return HV_E_FAIL;
 800         }
 801         if (*offset == 0)
 802                 strcpy(buffer, tmp);
 803         else {
 804                 strcat(buffer, ";");
 805                 strcat(buffer, tmp);
 806         }
 807
 808         *offset += strlen(str) + 1;
 809
 810         return 0;
 811 }
 812
 813 static int
 814 kvp_get_ip_info(int family, char *if_name, int op,
 815                  void  *out_buffer, unsigned int length)
 816 {
 817         struct ifaddrs *ifap;
 818         struct ifaddrs *curp;
 819         int offset = 0;
 820         int sn_offset = 0;
 821         int error = 0;
 822         char *buffer;
 823         struct hv_kvp_ipaddr_value *ip_buffer = NULL;
 824         char cidr_mask[5]; /* /xyz */
 825         int weight;
 826         int i;
 827         unsigned int *w;
 828         char *sn_str;
 829         struct sockaddr_in6 *addr6;
 830
 831         if (op == KVP_OP_ENUMERATE) {
 832                 buffer = out_buffer;
 833         } else {
 834                 ip_buffer = out_buffer;
 835                 buffer = (char *)ip_buffer->ip_addr;
 836                 ip_buffer->addr_family = 0;
 837         }
 838         /*
 839          * On entry into this function, the buffer is capable of holding the
 840          * maximum key value.
 841          */
 842
 843         if (getifaddrs(&ifap)) {
 844                 strcpy(buffer, "getifaddrs failed\n");
 845                 return HV_E_FAIL;
 846         }
 847
 848         curp = ifap;
 849         while (curp != NULL) {
 850                 if (curp->ifa_addr == NULL) {
 851                         curp = curp->ifa_next;
 852                         continue;
 853                 }
 854
 855                 if ((if_name != NULL) &&
 856                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
 857                         /*
 858                          * We want info about a specific interface;
 859                          * just continue.
 860                          */
 861                         curp = curp->ifa_next;
 862                         continue;
 863                 }
 864
 865                 /*
 866                  * We only support two address families: AF_INET and AF_INET6.
 867                  * If a family value of 0 is specified, we collect both
 868                  * supported address families; if not we gather info on
 869                  * the specified address family.
 870                  */
 871                 if ((((family != 0) &&
 872                          (curp->ifa_addr->sa_family != family))) ||
 873                          (curp->ifa_flags & IFF_LOOPBACK)) {
 874                         curp = curp->ifa_next;
 875                         continue;
 876                 }
 877                 if ((curp->ifa_addr->sa_family != AF_INET) &&
 878                         (curp->ifa_addr->sa_family != AF_INET6)) {
 879                         curp = curp->ifa_next;
 880                         continue;
 881                 }
 882
 883                 if (op == KVP_OP_GET_IP_INFO) {
 884                         /*
 885                          * Gather info other than the IP address.
 886                          * IP address info will be gathered later.
 887                          */
 888                         if (curp->ifa_addr->sa_family == AF_INET) {
 889                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
 890                                 /*
 891                                  * Get subnet info.
 892                                  */
 893                                 error = kvp_process_ip_address(
 894                                                              curp->ifa_netmask,
 895                                                              AF_INET,
 896                                                              (char *)
 897                                                              ip_buffer->sub_net,
 898                                                              length,
 899                                                              &sn_offset);
 900                                 if (error)
 901                                         goto gather_ipaddr;
 902                         } else {
 903                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
 904
 905                                 /*
 906                                  * Get subnet info in CIDR format.
 907                                  */
 908                                 weight = 0;
 909                                 sn_str = (char *)ip_buffer->sub_net;
 910                                 addr6 = (struct sockaddr_in6 *)
 911                                         curp->ifa_netmask;
 912                                 w = addr6->sin6_addr.s6_addr32;
 913
 914                                 for (i = 0; i < 4; i++)
 915                                         weight += hweight32(&w[i]);
 916
 917                                 sprintf(cidr_mask, "/%d", weight);
 918                                 if (length < sn_offset + strlen(cidr_mask) + 1)
 919                                         goto gather_ipaddr;
 920
 921                                 if (sn_offset == 0)
 922                                         strcpy(sn_str, cidr_mask);
 923                                 else {
 924                                         strcat((char *)ip_buffer->sub_net, ";");
 925                                         strcat(sn_str, cidr_mask);
 926                                 }
 927                                 sn_offset += strlen(sn_str) + 1;
 928                         }
 929
 930                         /*
 931                          * Collect other ip related configuration info.
 932                          */
 933
 934                         kvp_get_ipconfig_info(if_name, ip_buffer);
 935                 }
 936
 937 gather_ipaddr:
 938                 error = kvp_process_ip_address(curp->ifa_addr,
 939                                                 curp->ifa_addr->sa_family,
 940                                                 buffer,
 941                                                 length, &offset);
 942                 if (error)
 943                         goto getaddr_done;
 944
 945                 curp = curp->ifa_next;
 946         }
 947
 948 getaddr_done:
 949         freeifaddrs(ifap);
 950         return error;
 951 }
 952
 953 /*
 954  * Retrieve the IP given the MAC address.
 955  */
 956 static int kvp_mac_to_ip(struct hv_kvp_ipaddr_value *kvp_ip_val)
 957 {
 958         char *mac = (char *)kvp_ip_val->adapter_id;
 959         DIR *dir;
 960         struct dirent *entry;
 961         FILE    *file;
 962         char    *p, *x;
 963         char    *if_name = NULL;
 964         char    buf[256];
 965         char dev_id[PATH_MAX];
 966         unsigned int i;
 967         int error = HV_E_FAIL;
 968
 969         dir = opendir(KVP_NET_DIR);
 970         if (dir == NULL)
 971                 return HV_E_FAIL;
 972
 973         while ((entry = readdir(dir)) != NULL) {
 974                 /*
 975                  * Set the state for the next pass.
 976                  */
 977                 snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
 978                          entry->d_name);
 979
 980                 file = fopen(dev_id, "r");
 981                 if (file == NULL)
 982                         continue;
 983
 984                 p = fgets(buf, sizeof(buf), file);
 985                 fclose(file);
 986                 if (!p)
 987                         continue;
 988
 989                 x = strchr(p, '\n');
 990                 if (x)
 991                         *x = '\0';
 992
 993                 for (i = 0; i < strlen(p); i++)
 994                         p[i] = toupper(p[i]);
 995
 996                 if (strcmp(p, mac))
 997                         continue;
 998
 999                 /*
1000                  * Found the MAC match.
1001                  * A NIC (e.g. VF) matching the MAC, but without IP, is skipped.
1002                  */
1003                 if_name = entry->d_name;
1004                 if (!if_name)
1005                         continue;
1006
1007                 error = kvp_get_ip_info(0, if_name, KVP_OP_GET_IP_INFO,
1008                                         kvp_ip_val, MAX_IP_ADDR_SIZE * 2);
1009
1010                 if (!error && strlen((char *)kvp_ip_val->ip_addr))
1011                         break;
1012         }
1013
1014         closedir(dir);
1015         return error;
1016 }
1017
1018 static int expand_ipv6(char *addr, int type)
1019 {
1020         int ret;
1021         struct in6_addr v6_addr;
1022
1023         ret = inet_pton(AF_INET6, addr, &v6_addr);
1024
1025         if (ret != 1) {
1026                 if (type == NETMASK)
1027                         return 1;
1028                 return 0;
1029         }
1030
1031         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1032                 "%02x%02x:%02x%02x:%02x%02x",
1033                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1034                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1035                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1036                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1037                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1038                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1039                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1040                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1041
1042         return 1;
1043
1044 }
1045
1046 static int is_ipv4(char *addr)
1047 {
1048         int ret;
1049         struct in_addr ipv4_addr;
1050
1051         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1052
1053         if (ret == 1)
1054                 return 1;
1055         return 0;
1056 }
1057
1058 static int parse_ip_val_buffer(char *in_buf, int *offset,
1059                                 char *out_buf, int out_len)
1060 {
1061         char *x;
1062         char *start;
1063
1064         /*
1065          * in_buf has sequence of characters that are separated by
1066          * the character ';'. The last sequence does not have the
1067          * terminating ";" character.
1068          */
1069         start = in_buf + *offset;
1070
1071         x = strchr(start, ';');
1072         if (x)
1073                 *x = 0;
1074         else
1075                 x = start + strlen(start);
1076
1077         if (strlen(start) != 0) {
1078                 int i = 0;
1079                 /*
1080                  * Get rid of leading spaces.
1081                  */
1082                 while (start[i] == ' ')
1083                         i++;
1084
1085                 if ((x - start) <= out_len) {
1086                         strcpy(out_buf, (start + i));
1087                         *offset += (x - start) + 1;
1088                         return 1;
1089                 }
1090         }
1091         return 0;
1092 }
1093
1094 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1095 {
1096         int ret;
1097
1098         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1099
1100         if (ret < 0)
1101                 return HV_E_FAIL;
1102
1103         return 0;
1104 }
1105
1106
1107 static int process_ip_string(FILE *f, char *ip_string, int type)
1108 {
1109         int error = 0;
1110         char addr[INET6_ADDRSTRLEN];
1111         int i = 0;
1112         int j = 0;
1113         char str[256];
1114         char sub_str[13];
1115         int offset = 0;
1116
1117         memset(addr, 0, sizeof(addr));
1118
1119         while (parse_ip_val_buffer(ip_string, &offset, addr,
1120                                         (MAX_IP_ADDR_SIZE * 2))) {
1121
1122                 sub_str[0] = 0;
1123                 if (is_ipv4(addr)) {
1124                         switch (type) {
1125                         case IPADDR:
1126                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1127                                 break;
1128                         case NETMASK:
1129                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1130                                 break;
1131                         case GATEWAY:
1132                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1133                                 break;
1134                         case DNS:
1135                                 snprintf(str, sizeof(str), "%s", "DNS");
1136                                 break;
1137                         }
1138
1139                         if (type == DNS) {
1140                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1141                         } else if (type == GATEWAY && i == 0) {
1142                                 ++i;
1143                         } else {
1144                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1145                         }
1146
1147
1148                 } else if (expand_ipv6(addr, type)) {
1149                         switch (type) {
1150                         case IPADDR:
1151                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1152                                 break;
1153                         case NETMASK:
1154                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1155                                 break;
1156                         case GATEWAY:
1157                                 snprintf(str, sizeof(str), "%s",
1158                                         "IPV6_DEFAULTGW");
1159                                 break;
1160                         case DNS:
1161                                 snprintf(str, sizeof(str), "%s",  "DNS");
1162                                 break;
1163                         }
1164
1165                         if (type == DNS) {
1166                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1167                         } else if (j == 0) {
1168                                 ++j;
1169                         } else {
1170                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1171                         }
1172                 } else {
1173                         return  HV_INVALIDARG;
1174                 }
1175
1176                 error = kvp_write_file(f, str, sub_str, addr);
1177                 if (error)
1178                         return error;
1179                 memset(addr, 0, sizeof(addr));
1180         }
1181
1182         return 0;
1183 }
1184
1185 int ip_version_check(const char *input_addr)
1186 {
1187         struct in6_addr addr;
1188
1189         if (inet_pton(AF_INET, input_addr, &addr))
1190                 return IPV4;
1191         else if (inet_pton(AF_INET6, input_addr, &addr))
1192                 return IPV6;
1193
1194         return -EINVAL;
1195 }
1196
1197 /*
1198  * Only IPv4 subnet strings needs to be converted to plen
1199  * For IPv6 the subnet is already privided in plen format
1200  */
1201 static int kvp_subnet_to_plen(char *subnet_addr_str)
1202 {
1203         int plen = 0;
1204         struct in_addr subnet_addr4;
1205
1206         /*
1207          * Convert subnet address to binary representation
1208          */
1209         if (inet_pton(AF_INET, subnet_addr_str, &subnet_addr4) == 1) {
1210                 uint32_t subnet_mask = ntohl(subnet_addr4.s_addr);
1211
1212                 while (subnet_mask & 0x80000000) {
1213                         plen++;
1214                         subnet_mask <<= 1;
1215                 }
1216         } else {
1217                 return -1;
1218         }
1219
1220         return plen;
1221 }
1222
1223 static int process_dns_gateway_nm(FILE *f, char *ip_string, int type,
1224                                   int ip_sec)
1225 {
1226         char addr[INET6_ADDRSTRLEN], *output_str;
1227         int ip_offset = 0, error = 0, ip_ver;
1228         char *param_name;
1229
1230         if (type == DNS)
1231                 param_name = "dns";
1232         else if (type == GATEWAY)
1233                 param_name = "gateway";
1234         else
1235                 return -EINVAL;
1236
1237         output_str = (char *)calloc(OUTSTR_BUF_SIZE, sizeof(char));
1238         if (!output_str)
1239                 return -ENOMEM;
1240
1241         while (1) {
1242                 memset(addr, 0, sizeof(addr));
1243
1244                 if (!parse_ip_val_buffer(ip_string, &ip_offset, addr,
1245                                          (MAX_IP_ADDR_SIZE * 2)))
1246                         break;
1247
1248                 ip_ver = ip_version_check(addr);
1249                 if (ip_ver < 0)
1250                         continue;
1251
1252                 if ((ip_ver == IPV4 && ip_sec == IPV4) ||
1253                     (ip_ver == IPV6 && ip_sec == IPV6)) {
1254                         /*
1255                          * do a bound check to avoid out-of bound writes
1256                          */
1257                         if ((OUTSTR_BUF_SIZE - strlen(output_str)) >
1258                             (strlen(addr) + 1)) {
1259                                 strncat(output_str, addr,
1260                                         OUTSTR_BUF_SIZE -
1261                                         strlen(output_str) - 1);
1262                                 strncat(output_str, ",",
1263                                         OUTSTR_BUF_SIZE -
1264                                         strlen(output_str) - 1);
1265                         }
1266                 } else {
1267                         continue;
1268                 }
1269         }
1270
1271         if (strlen(output_str)) {
1272                 /*
1273                  * This is to get rid of that extra comma character
1274                  * in the end of the string
1275                  */
1276                 output_str[strlen(output_str) - 1] = '\0';
1277                 error = fprintf(f, "%s=%s\n", param_name, output_str);
1278         }
1279
1280         free(output_str);
1281         return error;
1282 }
1283
1284 static int process_ip_string_nm(FILE *f, char *ip_string, char *subnet,
1285                                 int ip_sec)
1286 {
1287         char addr[INET6_ADDRSTRLEN];
1288         char subnet_addr[INET6_ADDRSTRLEN];
1289         int error = 0, i = 0;
1290         int ip_offset = 0, subnet_offset = 0;
1291         int plen, ip_ver;
1292
1293         memset(addr, 0, sizeof(addr));
1294         memset(subnet_addr, 0, sizeof(subnet_addr));
1295
1296         while (parse_ip_val_buffer(ip_string, &ip_offset, addr,
1297                                    (MAX_IP_ADDR_SIZE * 2)) &&
1298                                    parse_ip_val_buffer(subnet,
1299                                                        &subnet_offset,
1300                                                        subnet_addr,
1301                                                        (MAX_IP_ADDR_SIZE *
1302                                                         2))) {
1303                 ip_ver = ip_version_check(addr);
1304                 if (ip_ver < 0)
1305                         continue;
1306
1307                 if (ip_ver == IPV4 && ip_sec == IPV4)
1308                         plen = kvp_subnet_to_plen((char *)subnet_addr);
1309                 else if (ip_ver == IPV6 && ip_sec == IPV6)
1310                         plen = atoi(subnet_addr);
1311                 else
1312                         continue;
1313
1314                 if (plen < 0)
1315                         return plen;
1316
1317                 error = fprintf(f, "address%d=%s/%d\n", ++i, (char *)addr,
1318                                 plen);
1319                 if (error < 0)
1320                         return error;
1321
1322                 memset(addr, 0, sizeof(addr));
1323                 memset(subnet_addr, 0, sizeof(subnet_addr));
1324         }
1325
1326         return error;
1327 }
1328
1329 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1330 {
1331         int error = 0, ip_ver;
1332         char if_filename[PATH_MAX];
1333         char nm_filename[PATH_MAX];
1334         FILE *ifcfg_file, *nmfile;
1335         char cmd[PATH_MAX];
1336         char *mac_addr;
1337         int str_len;
1338
1339         /*
1340          * Set the configuration for the specified interface with
1341          * the information provided. Since there is no standard
1342          * way to configure an interface, we will have an external
1343          * script that does the job of configuring the interface and
1344          * flushing the configuration.
1345          *
1346          * The parameters passed to this external script are:
1347          * 1. A configuration file that has the specified configuration.
1348          *
1349          * We will embed the name of the interface in the configuration
1350          * file: ifcfg-ethx (where ethx is the interface name).
1351          *
1352          * The information provided here may be more than what is needed
1353          * in a given distro to configure the interface and so are free
1354          * ignore information that may not be relevant.
1355          *
1356          * Here is the ifcfg format of the ip configuration file:
1357          *
1358          * HWADDR=macaddr
1359          * DEVICE=interface name
1360          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1361          *                       or "none" if no boot-time protocol should be used)
1362          *
1363          * IPADDR0=ipaddr1
1364          * IPADDR1=ipaddr2
1365          * IPADDRx=ipaddry (where y = x + 1)
1366          *
1367          * NETMASK0=netmask1
1368          * NETMASKx=netmasky (where y = x + 1)
1369          *
1370          * GATEWAY=ipaddr1
1371          * GATEWAYx=ipaddry (where y = x + 1)
1372          *
1373          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1374          *
1375          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1376          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1377          * IPV6NETMASK.
1378          *
1379          * Here is the keyfile format of the ip configuration file:
1380          *
1381          * [ethernet]
1382          * mac-address=macaddr
1383          * [connection]
1384          * interface-name=interface name
1385          *
1386          * [ipv4]
1387          * method=<protocol> (where <protocol> is "auto" if DHCP is configured
1388          *                       or "manual" if no boot-time protocol should be used)
1389          *
1390          * address1=ipaddr1/plen
1391          * address2=ipaddr2/plen
1392          *
1393          * gateway=gateway1;gateway2
1394          *
1395          * dns=dns1;dns2
1396          *
1397          * [ipv6]
1398          * address1=ipaddr1/plen
1399          * address2=ipaddr2/plen
1400          *
1401          * gateway=gateway1;gateway2
1402          *
1403          * dns=dns1;dns2
1404          *
1405          * The host can specify multiple ipv4 and ipv6 addresses to be
1406          * configured for the interface. Furthermore, the configuration
1407          * needs to be persistent. A subsequent GET call on the interface
1408          * is expected to return the configuration that is set via the SET
1409          * call.
1410          */
1411
1412         /*
1413          * We are populating both ifcfg and nmconnection files
1414          */
1415         snprintf(if_filename, sizeof(if_filename), "%s%s%s", KVP_CONFIG_LOC,
1416                  "/ifcfg-", if_name);
1417
1418         ifcfg_file = fopen(if_filename, "w");
1419
1420         if (!ifcfg_file) {
1421                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1422                        errno, strerror(errno));
1423                 return HV_E_FAIL;
1424         }
1425
1426         snprintf(nm_filename, sizeof(nm_filename), "%s%s%s%s", KVP_CONFIG_LOC,
1427                  "/", if_name, ".nmconnection");
1428
1429         nmfile = fopen(nm_filename, "w");
1430
1431         if (!nmfile) {
1432                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1433                        errno, strerror(errno));
1434                 fclose(ifcfg_file);
1435                 return HV_E_FAIL;
1436         }
1437
1438         /*
1439          * First write out the MAC address.
1440          */
1441
1442         mac_addr = kvp_if_name_to_mac(if_name);
1443         if (mac_addr == NULL) {
1444                 error = HV_E_FAIL;
1445                 goto setval_error;
1446         }
1447
1448         error = kvp_write_file(ifcfg_file, "HWADDR", "", mac_addr);
1449         if (error < 0)
1450                 goto setmac_error;
1451
1452         error = kvp_write_file(ifcfg_file, "DEVICE", "", if_name);
1453         if (error < 0)
1454                 goto setmac_error;
1455
1456         error = fprintf(nmfile, "\n[connection]\n");
1457         if (error < 0)
1458                 goto setmac_error;
1459
1460         error = kvp_write_file(nmfile, "interface-name", "", if_name);
1461         if (error)
1462                 goto setmac_error;
1463
1464         error = fprintf(nmfile, "\n[ethernet]\n");
1465         if (error < 0)
1466                 goto setmac_error;
1467
1468         error = kvp_write_file(nmfile, "mac-address", "", mac_addr);
1469         if (error)
1470                 goto setmac_error;
1471
1472         free(mac_addr);
1473
1474         /*
1475          * The dhcp_enabled flag is only for IPv4. In the case the host only
1476          * injects an IPv6 address, the flag is true, but we still need to
1477          * proceed to parse and pass the IPv6 information to the
1478          * disto-specific script hv_set_ifconfig.
1479          */
1480
1481         /*
1482          * First populate the ifcfg file format
1483          */
1484         if (new_val->dhcp_enabled) {
1485                 error = kvp_write_file(ifcfg_file, "BOOTPROTO", "", "dhcp");
1486                 if (error)
1487                         goto setval_error;
1488         } else {
1489                 error = kvp_write_file(ifcfg_file, "BOOTPROTO", "", "none");
1490                 if (error)
1491                         goto setval_error;
1492         }
1493
1494         error = process_ip_string(ifcfg_file, (char *)new_val->ip_addr,
1495                                   IPADDR);
1496         if (error)
1497                 goto setval_error;
1498
1499         error = process_ip_string(ifcfg_file, (char *)new_val->sub_net,
1500                                   NETMASK);
1501         if (error)
1502                 goto setval_error;
1503
1504         error = process_ip_string(ifcfg_file, (char *)new_val->gate_way,
1505                                   GATEWAY);
1506         if (error)
1507                 goto setval_error;
1508
1509         error = process_ip_string(ifcfg_file, (char *)new_val->dns_addr, DNS);
1510         if (error)
1511                 goto setval_error;
1512
1513         /*
1514          * Now we populate the keyfile format
1515          *
1516          * The keyfile format expects the IPv6 and IPv4 configuration in
1517          * different sections. Therefore we iterate through the list twice,
1518          * once to populate the IPv4 section and the next time for IPv6
1519          */
1520         ip_ver = IPV4;
1521         do {
1522                 if (ip_ver == IPV4) {
1523                         error = fprintf(nmfile, "\n[ipv4]\n");
1524                         if (error < 0)
1525                                 goto setval_error;
1526                 } else {
1527                         error = fprintf(nmfile, "\n[ipv6]\n");
1528                         if (error < 0)
1529                                 goto setval_error;
1530                 }
1531
1532                 /*
1533                  * Write the configuration for ipaddress, netmask, gateway and
1534                  * name services
1535                  */
1536                 error = process_ip_string_nm(nmfile, (char *)new_val->ip_addr,
1537                                              (char *)new_val->sub_net,
1538                                              ip_ver);
1539                 if (error < 0)
1540                         goto setval_error;
1541
1542                 /*
1543                  * As dhcp_enabled is only valid for ipv4, we do not set dhcp
1544                  * methods for ipv6 based on dhcp_enabled flag.
1545                  *
1546                  * For ipv4, set method to manual only when dhcp_enabled is
1547                  * false and specific ipv4 addresses are configured. If neither
1548                  * dhcp_enabled is true and no ipv4 addresses are configured,
1549                  * set method to 'disabled'.
1550                  *
1551                  * For ipv6, set method to manual when we configure ipv6
1552                  * addresses. Otherwise set method to 'auto' so that SLAAC from
1553                  * RA may be used.
1554                  */
1555                 if (ip_ver == IPV4) {
1556                         if (new_val->dhcp_enabled) {
1557                                 error = kvp_write_file(nmfile, "method", "",
1558                                                        "auto");
1559                                 if (error < 0)
1560                                         goto setval_error;
1561                         } else if (error) {
1562                                 error = kvp_write_file(nmfile, "method", "",
1563                                                        "manual");
1564                                 if (error < 0)
1565                                         goto setval_error;
1566                         } else {
1567                                 error = kvp_write_file(nmfile, "method", "",
1568                                                        "disabled");
1569                                 if (error < 0)
1570                                         goto setval_error;
1571                         }
1572                 } else if (ip_ver == IPV6) {
1573                         if (error) {
1574                                 error = kvp_write_file(nmfile, "method", "",
1575                                                        "manual");
1576                                 if (error < 0)
1577                                         goto setval_error;
1578                         } else {
1579                                 error = kvp_write_file(nmfile, "method", "",
1580                                                        "auto");
1581                                 if (error < 0)
1582                                         goto setval_error;
1583                         }
1584                 }
1585
1586                 error = process_dns_gateway_nm(nmfile,
1587                                                (char *)new_val->gate_way,
1588                                                GATEWAY, ip_ver);
1589                 if (error < 0)
1590                         goto setval_error;
1591
1592                 error = process_dns_gateway_nm(nmfile,
1593                                                (char *)new_val->dns_addr, DNS,
1594                                                ip_ver);
1595                 if (error < 0)
1596                         goto setval_error;
1597
1598                 ip_ver++;
1599         } while (ip_ver < IP_TYPE_MAX);
1600
1601         fclose(nmfile);
1602         fclose(ifcfg_file);
1603
1604         /*
1605          * Now that we have populated the configuration file,
1606          * invoke the external script to do its magic.
1607          */
1608
1609         str_len = snprintf(cmd, sizeof(cmd), KVP_SCRIPTS_PATH "%s %s %s",
1610                            "hv_set_ifconfig", if_filename, nm_filename);
1611         /*
1612          * This is a little overcautious, but it's necessary to suppress some
1613          * false warnings from gcc 8.0.1.
1614          */
1615         if (str_len <= 0 || (unsigned int)str_len >= sizeof(cmd)) {
1616                 syslog(LOG_ERR, "Cmd '%s' (len=%d) may be too long",
1617                        cmd, str_len);
1618                 return HV_E_FAIL;
1619         }
1620
1621         if (system(cmd)) {
1622                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1623                        cmd, errno, strerror(errno));
1624                 return HV_E_FAIL;
1625         }
1626         return 0;
1627 setmac_error:
1628         free(mac_addr);
1629 setval_error:
1630         syslog(LOG_ERR, "Failed to write config file");
1631         fclose(ifcfg_file);
1632         fclose(nmfile);
1633         return error;
1634 }
1635
1636
1637 static void
1638 kvp_get_domain_name(char *buffer, int length)
1639 {
1640         struct addrinfo hints, *info ;
1641         int error = 0;
1642
1643         gethostname(buffer, length);
1644         memset(&hints, 0, sizeof(hints));
1645         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1646         hints.ai_socktype = SOCK_STREAM;
1647         hints.ai_flags = AI_CANONNAME;
1648
1649         error = getaddrinfo(buffer, NULL, &hints, &info);
1650         if (error != 0) {
1651                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1652                         error, gai_strerror(error));
1653                 return;
1654         }
1655         snprintf(buffer, length, "%s", info->ai_canonname);
1656         freeaddrinfo(info);
1657 }
1658
1659 void print_usage(char *argv[])
1660 {
1661         fprintf(stderr, "Usage: %s [options]\n"
1662                 "Options are:\n"
1663                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1664                 "  -h, --help             print this help\n", argv[0]);
1665 }
1666
1667 int main(int argc, char *argv[])
1668 {
1669         int kvp_fd = -1, len;
1670         int error;
1671         struct pollfd pfd;
1672         char    *p;
1673         struct hv_kvp_msg hv_msg[1];
1674         char    *key_value;
1675         char    *key_name;
1676         int     op;
1677         int     pool;
1678         char    *if_name;
1679         struct hv_kvp_ipaddr_value *kvp_ip_val;
1680         int daemonize = 1, long_index = 0, opt;
1681
1682         static struct option long_options[] = {
1683                 {"help",        no_argument,       0,  'h' },
1684                 {"no-daemon",   no_argument,       0,  'n' },
1685                 {0,             0,                 0,  0   }
1686         };
1687
1688         while ((opt = getopt_long(argc, argv, "hn", long_options,
1689                                   &long_index)) != -1) {
1690                 switch (opt) {
1691                 case 'n':
1692                         daemonize = 0;
1693                         break;
1694                 case 'h':
1695                         print_usage(argv);
1696                         exit(0);
1697                 default:
1698                         print_usage(argv);
1699                         exit(EXIT_FAILURE);
1700                 }
1701         }
1702
1703         if (daemonize && daemon(1, 0))
1704                 return 1;
1705
1706         openlog("KVP", 0, LOG_USER);
1707         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1708
1709         /*
1710          * Retrieve OS release information.
1711          */
1712         kvp_get_os_info();
1713         /*
1714          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1715          * unpredictable amount of time to finish.
1716          */
1717         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1718
1719         if (kvp_file_init()) {
1720                 syslog(LOG_ERR, "Failed to initialize the pools");
1721                 exit(EXIT_FAILURE);
1722         }
1723
1724 reopen_kvp_fd:
1725         if (kvp_fd != -1)
1726                 close(kvp_fd);
1727         in_hand_shake = 1;
1728         kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
1729
1730         if (kvp_fd < 0) {
1731                 syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1732                        errno, strerror(errno));
1733                 exit(EXIT_FAILURE);
1734         }
1735
1736         /*
1737          * Register ourselves with the kernel.
1738          */
1739         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1740         len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1741         if (len != sizeof(struct hv_kvp_msg)) {
1742                 syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1743                        errno, strerror(errno));
1744                 close(kvp_fd);
1745                 exit(EXIT_FAILURE);
1746         }
1747
1748         pfd.fd = kvp_fd;
1749
1750         while (1) {
1751                 pfd.events = POLLIN;
1752                 pfd.revents = 0;
1753
1754                 if (poll(&pfd, 1, -1) < 0) {
1755                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1756                         if (errno == EINVAL) {
1757                                 close(kvp_fd);
1758                                 exit(EXIT_FAILURE);
1759                         }
1760                         else
1761                                 continue;
1762                 }
1763
1764                 len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1765
1766                 if (len != sizeof(struct hv_kvp_msg)) {
1767                         syslog(LOG_ERR, "read failed; error:%d %s",
1768                                errno, strerror(errno));
1769                         goto reopen_kvp_fd;
1770                 }
1771
1772                 /*
1773                  * We will use the KVP header information to pass back
1774                  * the error from this daemon. So, first copy the state
1775                  * and set the error code to success.
1776                  */
1777                 op = hv_msg->kvp_hdr.operation;
1778                 pool = hv_msg->kvp_hdr.pool;
1779                 hv_msg->error = HV_S_OK;
1780
1781                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1782                         /*
1783                          * Driver is registering with us; stash away the version
1784                          * information.
1785                          */
1786                         in_hand_shake = 0;
1787                         p = (char *)hv_msg->body.kvp_register.version;
1788                         lic_version = malloc(strlen(p) + 1);
1789                         if (lic_version) {
1790                                 strcpy(lic_version, p);
1791                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1792                                        lic_version);
1793                         } else {
1794                                 syslog(LOG_ERR, "malloc failed");
1795                         }
1796                         continue;
1797                 }
1798
1799                 switch (op) {
1800                 case KVP_OP_GET_IP_INFO:
1801                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1802
1803                         error = kvp_mac_to_ip(kvp_ip_val);
1804
1805                         if (error)
1806                                 hv_msg->error = error;
1807
1808                         break;
1809
1810                 case KVP_OP_SET_IP_INFO:
1811                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1812                         if_name = kvp_get_if_name(
1813                                         (char *)kvp_ip_val->adapter_id);
1814                         if (if_name == NULL) {
1815                                 /*
1816                                  * We could not map the guid to an
1817                                  * interface name; return error.
1818                                  */
1819                                 hv_msg->error = HV_GUID_NOTFOUND;
1820                                 break;
1821                         }
1822                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1823                         if (error)
1824                                 hv_msg->error = error;
1825
1826                         free(if_name);
1827                         break;
1828
1829                 case KVP_OP_SET:
1830                         if (kvp_key_add_or_modify(pool,
1831                                         hv_msg->body.kvp_set.data.key,
1832                                         hv_msg->body.kvp_set.data.key_size,
1833                                         hv_msg->body.kvp_set.data.value,
1834                                         hv_msg->body.kvp_set.data.value_size))
1835                                         hv_msg->error = HV_S_CONT;
1836                         break;
1837
1838                 case KVP_OP_GET:
1839                         if (kvp_get_value(pool,
1840                                         hv_msg->body.kvp_set.data.key,
1841                                         hv_msg->body.kvp_set.data.key_size,
1842                                         hv_msg->body.kvp_set.data.value,
1843                                         hv_msg->body.kvp_set.data.value_size))
1844                                         hv_msg->error = HV_S_CONT;
1845                         break;
1846
1847                 case KVP_OP_DELETE:
1848                         if (kvp_key_delete(pool,
1849                                         hv_msg->body.kvp_delete.key,
1850                                         hv_msg->body.kvp_delete.key_size))
1851                                         hv_msg->error = HV_S_CONT;
1852                         break;
1853
1854                 default:
1855                         break;
1856                 }
1857
1858                 if (op != KVP_OP_ENUMERATE)
1859                         goto kvp_done;
1860
1861                 /*
1862                  * If the pool is KVP_POOL_AUTO, dynamically generate
1863                  * both the key and the value; if not read from the
1864                  * appropriate pool.
1865                  */
1866                 if (pool != KVP_POOL_AUTO) {
1867                         if (kvp_pool_enumerate(pool,
1868                                         hv_msg->body.kvp_enum_data.index,
1869                                         hv_msg->body.kvp_enum_data.data.key,
1870                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1871                                         hv_msg->body.kvp_enum_data.data.value,
1872                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1873                                         hv_msg->error = HV_S_CONT;
1874                         goto kvp_done;
1875                 }
1876
1877                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1878                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1879
1880                 switch (hv_msg->body.kvp_enum_data.index) {
1881                 case FullyQualifiedDomainName:
1882                         strcpy(key_value, full_domain_name);
1883                         strcpy(key_name, "FullyQualifiedDomainName");
1884                         break;
1885                 case IntegrationServicesVersion:
1886                         strcpy(key_name, "IntegrationServicesVersion");
1887                         strcpy(key_value, lic_version);
1888                         break;
1889                 case NetworkAddressIPv4:
1890                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1891                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1892                         strcpy(key_name, "NetworkAddressIPv4");
1893                         break;
1894                 case NetworkAddressIPv6:
1895                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1896                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1897                         strcpy(key_name, "NetworkAddressIPv6");
1898                         break;
1899                 case OSBuildNumber:
1900                         strcpy(key_value, os_build);
1901                         strcpy(key_name, "OSBuildNumber");
1902                         break;
1903                 case OSName:
1904                         strcpy(key_value, os_name);
1905                         strcpy(key_name, "OSName");
1906                         break;
1907                 case OSMajorVersion:
1908                         strcpy(key_value, os_major);
1909                         strcpy(key_name, "OSMajorVersion");
1910                         break;
1911                 case OSMinorVersion:
1912                         strcpy(key_value, os_minor);
1913                         strcpy(key_name, "OSMinorVersion");
1914                         break;
1915                 case OSVersion:
1916                         strcpy(key_value, os_version);
1917                         strcpy(key_name, "OSVersion");
1918                         break;
1919                 case ProcessorArchitecture:
1920                         strcpy(key_value, processor_arch);
1921                         strcpy(key_name, "ProcessorArchitecture");
1922                         break;
1923                 default:
1924                         hv_msg->error = HV_S_CONT;
1925                         break;
1926                 }
1927
1928                 /*
1929                  * Send the value back to the kernel. Note: the write() may
1930                  * return an error due to hibernation; we can ignore the error
1931                  * by resetting the dev file, i.e. closing and re-opening it.
1932                  */
1933 kvp_done:
1934                 len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1935                 if (len != sizeof(struct hv_kvp_msg)) {
1936                         syslog(LOG_ERR, "write failed; error: %d %s", errno,
1937                                strerror(errno));
1938                         goto reopen_kvp_fd;
1939                 }
1940         }
1941
1942         close(kvp_fd);
1943         exit(0);
1944 }