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Linux/tools/hv/hv_kvp_daemon.c

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  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/hyperv.h>
 37 #include <linux/netlink.h>
 38 #include <ifaddrs.h>
 39 #include <netdb.h>
 40 #include <syslog.h>
 41 #include <sys/stat.h>
 42 #include <fcntl.h>
 43 #include <dirent.h>
 44 #include <net/if.h>
 45 #include <getopt.h>
 46 
 47 /*
 48  * KVP protocol: The user mode component first registers with the
 49  * the kernel component. Subsequently, the kernel component requests, data
 50  * for the specified keys. In response to this message the user mode component
 51  * fills in the value corresponding to the specified key. We overload the
 52  * sequence field in the cn_msg header to define our KVP message types.
 53  *
 54  * We use this infrastructure for also supporting queries from user mode
 55  * application for state that may be maintained in the KVP kernel component.
 56  *
 57  */
 58 
 59 
 60 enum key_index {
 61         FullyQualifiedDomainName = 0,
 62         IntegrationServicesVersion, /*This key is serviced in the kernel*/
 63         NetworkAddressIPv4,
 64         NetworkAddressIPv6,
 65         OSBuildNumber,
 66         OSName,
 67         OSMajorVersion,
 68         OSMinorVersion,
 69         OSVersion,
 70         ProcessorArchitecture
 71 };
 72 
 73 
 74 enum {
 75         IPADDR = 0,
 76         NETMASK,
 77         GATEWAY,
 78         DNS
 79 };
 80 
 81 static int in_hand_shake = 1;
 82 
 83 static char *os_name = "";
 84 static char *os_major = "";
 85 static char *os_minor = "";
 86 static char *processor_arch;
 87 static char *os_build;
 88 static char *os_version;
 89 static char *lic_version = "Unknown version";
 90 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 91 static struct utsname uts_buf;
 92 
 93 /*
 94  * The location of the interface configuration file.
 95  */
 96 
 97 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 98 
 99 #define MAX_FILE_NAME 100
100 #define ENTRIES_PER_BLOCK 50
101 
102 #ifndef SOL_NETLINK
103 #define SOL_NETLINK 270
104 #endif
105 
106 struct kvp_record {
107         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
108         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
109 };
110 
111 struct kvp_file_state {
112         int fd;
113         int num_blocks;
114         struct kvp_record *records;
115         int num_records;
116         char fname[MAX_FILE_NAME];
117 };
118 
119 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
120 
121 static void kvp_acquire_lock(int pool)
122 {
123         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
124         fl.l_pid = getpid();
125 
126         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
127                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
128                                 errno, strerror(errno));
129                 exit(EXIT_FAILURE);
130         }
131 }
132 
133 static void kvp_release_lock(int pool)
134 {
135         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
136         fl.l_pid = getpid();
137 
138         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
139                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
140                                 errno, strerror(errno));
141                 exit(EXIT_FAILURE);
142         }
143 }
144 
145 static void kvp_update_file(int pool)
146 {
147         FILE *filep;
148 
149         /*
150          * We are going to write our in-memory registry out to
151          * disk; acquire the lock first.
152          */
153         kvp_acquire_lock(pool);
154 
155         filep = fopen(kvp_file_info[pool].fname, "we");
156         if (!filep) {
157                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
158                                 errno, strerror(errno));
159                 kvp_release_lock(pool);
160                 exit(EXIT_FAILURE);
161         }
162 
163         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
164                                 kvp_file_info[pool].num_records, filep);
165 
166         if (ferror(filep) || fclose(filep)) {
167                 kvp_release_lock(pool);
168                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
169                 exit(EXIT_FAILURE);
170         }
171 
172         kvp_release_lock(pool);
173 }
174 
175 static void kvp_update_mem_state(int pool)
176 {
177         FILE *filep;
178         size_t records_read = 0;
179         struct kvp_record *record = kvp_file_info[pool].records;
180         struct kvp_record *readp;
181         int num_blocks = kvp_file_info[pool].num_blocks;
182         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
183 
184         kvp_acquire_lock(pool);
185 
186         filep = fopen(kvp_file_info[pool].fname, "re");
187         if (!filep) {
188                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
189                                 errno, strerror(errno));
190                 kvp_release_lock(pool);
191                 exit(EXIT_FAILURE);
192         }
193         for (;;) {
194                 readp = &record[records_read];
195                 records_read += fread(readp, sizeof(struct kvp_record),
196                                         ENTRIES_PER_BLOCK * num_blocks,
197                                         filep);
198 
199                 if (ferror(filep)) {
200                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
201                         exit(EXIT_FAILURE);
202                 }
203 
204                 if (!feof(filep)) {
205                         /*
206                          * We have more data to read.
207                          */
208                         num_blocks++;
209                         record = realloc(record, alloc_unit * num_blocks);
210 
211                         if (record == NULL) {
212                                 syslog(LOG_ERR, "malloc failed");
213                                 exit(EXIT_FAILURE);
214                         }
215                         continue;
216                 }
217                 break;
218         }
219 
220         kvp_file_info[pool].num_blocks = num_blocks;
221         kvp_file_info[pool].records = record;
222         kvp_file_info[pool].num_records = records_read;
223 
224         fclose(filep);
225         kvp_release_lock(pool);
226 }
227 static int kvp_file_init(void)
228 {
229         int  fd;
230         FILE *filep;
231         size_t records_read;
232         char *fname;
233         struct kvp_record *record;
234         struct kvp_record *readp;
235         int num_blocks;
236         int i;
237         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
238 
239         if (access(KVP_CONFIG_LOC, F_OK)) {
240                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
241                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
242                                         errno, strerror(errno));
243                         exit(EXIT_FAILURE);
244                 }
245         }
246 
247         for (i = 0; i < KVP_POOL_COUNT; i++) {
248                 fname = kvp_file_info[i].fname;
249                 records_read = 0;
250                 num_blocks = 1;
251                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
252                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
253 
254                 if (fd == -1)
255                         return 1;
256 
257 
258                 filep = fopen(fname, "re");
259                 if (!filep) {
260                         close(fd);
261                         return 1;
262                 }
263 
264                 record = malloc(alloc_unit * num_blocks);
265                 if (record == NULL) {
266                         fclose(filep);
267                         close(fd);
268                         return 1;
269                 }
270                 for (;;) {
271                         readp = &record[records_read];
272                         records_read += fread(readp, sizeof(struct kvp_record),
273                                         ENTRIES_PER_BLOCK,
274                                         filep);
275 
276                         if (ferror(filep)) {
277                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
278                                        i);
279                                 exit(EXIT_FAILURE);
280                         }
281 
282                         if (!feof(filep)) {
283                                 /*
284                                  * We have more data to read.
285                                  */
286                                 num_blocks++;
287                                 record = realloc(record, alloc_unit *
288                                                 num_blocks);
289                                 if (record == NULL) {
290                                         fclose(filep);
291                                         close(fd);
292                                         return 1;
293                                 }
294                                 continue;
295                         }
296                         break;
297                 }
298                 kvp_file_info[i].fd = fd;
299                 kvp_file_info[i].num_blocks = num_blocks;
300                 kvp_file_info[i].records = record;
301                 kvp_file_info[i].num_records = records_read;
302                 fclose(filep);
303 
304         }
305 
306         return 0;
307 }
308 
309 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
310 {
311         int i;
312         int j, k;
313         int num_records;
314         struct kvp_record *record;
315 
316         /*
317          * First update the in-memory state.
318          */
319         kvp_update_mem_state(pool);
320 
321         num_records = kvp_file_info[pool].num_records;
322         record = kvp_file_info[pool].records;
323 
324         for (i = 0; i < num_records; i++) {
325                 if (memcmp(key, record[i].key, key_size))
326                         continue;
327                 /*
328                  * Found a match; just move the remaining
329                  * entries up.
330                  */
331                 if (i == num_records) {
332                         kvp_file_info[pool].num_records--;
333                         kvp_update_file(pool);
334                         return 0;
335                 }
336 
337                 j = i;
338                 k = j + 1;
339                 for (; k < num_records; k++) {
340                         strcpy(record[j].key, record[k].key);
341                         strcpy(record[j].value, record[k].value);
342                         j++;
343                 }
344 
345                 kvp_file_info[pool].num_records--;
346                 kvp_update_file(pool);
347                 return 0;
348         }
349         return 1;
350 }
351 
352 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
353                                  const __u8 *value, int value_size)
354 {
355         int i;
356         int num_records;
357         struct kvp_record *record;
358         int num_blocks;
359 
360         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
361                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
362                 return 1;
363 
364         /*
365          * First update the in-memory state.
366          */
367         kvp_update_mem_state(pool);
368 
369         num_records = kvp_file_info[pool].num_records;
370         record = kvp_file_info[pool].records;
371         num_blocks = kvp_file_info[pool].num_blocks;
372 
373         for (i = 0; i < num_records; i++) {
374                 if (memcmp(key, record[i].key, key_size))
375                         continue;
376                 /*
377                  * Found a match; just update the value -
378                  * this is the modify case.
379                  */
380                 memcpy(record[i].value, value, value_size);
381                 kvp_update_file(pool);
382                 return 0;
383         }
384 
385         /*
386          * Need to add a new entry;
387          */
388         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
389                 /* Need to allocate a larger array for reg entries. */
390                 record = realloc(record, sizeof(struct kvp_record) *
391                          ENTRIES_PER_BLOCK * (num_blocks + 1));
392 
393                 if (record == NULL)
394                         return 1;
395                 kvp_file_info[pool].num_blocks++;
396 
397         }
398         memcpy(record[i].value, value, value_size);
399         memcpy(record[i].key, key, key_size);
400         kvp_file_info[pool].records = record;
401         kvp_file_info[pool].num_records++;
402         kvp_update_file(pool);
403         return 0;
404 }
405 
406 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
407                         int value_size)
408 {
409         int i;
410         int num_records;
411         struct kvp_record *record;
412 
413         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
414                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
415                 return 1;
416 
417         /*
418          * First update the in-memory state.
419          */
420         kvp_update_mem_state(pool);
421 
422         num_records = kvp_file_info[pool].num_records;
423         record = kvp_file_info[pool].records;
424 
425         for (i = 0; i < num_records; i++) {
426                 if (memcmp(key, record[i].key, key_size))
427                         continue;
428                 /*
429                  * Found a match; just copy the value out.
430                  */
431                 memcpy(value, record[i].value, value_size);
432                 return 0;
433         }
434 
435         return 1;
436 }
437 
438 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
439                                 __u8 *value, int value_size)
440 {
441         struct kvp_record *record;
442 
443         /*
444          * First update our in-memory database.
445          */
446         kvp_update_mem_state(pool);
447         record = kvp_file_info[pool].records;
448 
449         if (index >= kvp_file_info[pool].num_records) {
450                 return 1;
451         }
452 
453         memcpy(key, record[index].key, key_size);
454         memcpy(value, record[index].value, value_size);
455         return 0;
456 }
457 
458 
459 void kvp_get_os_info(void)
460 {
461         FILE    *file;
462         char    *p, buf[512];
463 
464         uname(&uts_buf);
465         os_version = uts_buf.release;
466         os_build = strdup(uts_buf.release);
467 
468         os_name = uts_buf.sysname;
469         processor_arch = uts_buf.machine;
470 
471         /*
472          * The current windows host (win7) expects the build
473          * string to be of the form: x.y.z
474          * Strip additional information we may have.
475          */
476         p = strchr(os_version, '-');
477         if (p)
478                 *p = '\0';
479 
480         /*
481          * Parse the /etc/os-release file if present:
482          * http://www.freedesktop.org/software/systemd/man/os-release.html
483          */
484         file = fopen("/etc/os-release", "r");
485         if (file != NULL) {
486                 while (fgets(buf, sizeof(buf), file)) {
487                         char *value, *q;
488 
489                         /* Ignore comments */
490                         if (buf[0] == '#')
491                                 continue;
492 
493                         /* Split into name=value */
494                         p = strchr(buf, '=');
495                         if (!p)
496                                 continue;
497                         *p++ = 0;
498 
499                         /* Remove quotes and newline; un-escape */
500                         value = p;
501                         q = p;
502                         while (*p) {
503                                 if (*p == '\\') {
504                                         ++p;
505                                         if (!*p)
506                                                 break;
507                                         *q++ = *p++;
508                                 } else if (*p == '\'' || *p == '"' ||
509                                            *p == '\n') {
510                                         ++p;
511                                 } else {
512                                         *q++ = *p++;
513                                 }
514                         }
515                         *q = 0;
516 
517                         if (!strcmp(buf, "NAME")) {
518                                 p = strdup(value);
519                                 if (!p)
520                                         break;
521                                 os_name = p;
522                         } else if (!strcmp(buf, "VERSION_ID")) {
523                                 p = strdup(value);
524                                 if (!p)
525                                         break;
526                                 os_major = p;
527                         }
528                 }
529                 fclose(file);
530                 return;
531         }
532 
533         /* Fallback for older RH/SUSE releases */
534         file = fopen("/etc/SuSE-release", "r");
535         if (file != NULL)
536                 goto kvp_osinfo_found;
537         file  = fopen("/etc/redhat-release", "r");
538         if (file != NULL)
539                 goto kvp_osinfo_found;
540 
541         /*
542          * We don't have information about the os.
543          */
544         return;
545 
546 kvp_osinfo_found:
547         /* up to three lines */
548         p = fgets(buf, sizeof(buf), file);
549         if (p) {
550                 p = strchr(buf, '\n');
551                 if (p)
552                         *p = '\0';
553                 p = strdup(buf);
554                 if (!p)
555                         goto done;
556                 os_name = p;
557 
558                 /* second line */
559                 p = fgets(buf, sizeof(buf), file);
560                 if (p) {
561                         p = strchr(buf, '\n');
562                         if (p)
563                                 *p = '\0';
564                         p = strdup(buf);
565                         if (!p)
566                                 goto done;
567                         os_major = p;
568 
569                         /* third line */
570                         p = fgets(buf, sizeof(buf), file);
571                         if (p)  {
572                                 p = strchr(buf, '\n');
573                                 if (p)
574                                         *p = '\0';
575                                 p = strdup(buf);
576                                 if (p)
577                                         os_minor = p;
578                         }
579                 }
580         }
581 
582 done:
583         fclose(file);
584         return;
585 }
586 
587 
588 
589 /*
590  * Retrieve an interface name corresponding to the specified guid.
591  * If there is a match, the function returns a pointer
592  * to the interface name and if not, a NULL is returned.
593  * If a match is found, the caller is responsible for
594  * freeing the memory.
595  */
596 
597 static char *kvp_get_if_name(char *guid)
598 {
599         DIR *dir;
600         struct dirent *entry;
601         FILE    *file;
602         char    *p, *q, *x;
603         char    *if_name = NULL;
604         char    buf[256];
605         char *kvp_net_dir = "/sys/class/net/";
606         char dev_id[256];
607 
608         dir = opendir(kvp_net_dir);
609         if (dir == NULL)
610                 return NULL;
611 
612         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
613         q = dev_id + strlen(kvp_net_dir);
614 
615         while ((entry = readdir(dir)) != NULL) {
616                 /*
617                  * Set the state for the next pass.
618                  */
619                 *q = '\0';
620                 strcat(dev_id, entry->d_name);
621                 strcat(dev_id, "/device/device_id");
622 
623                 file = fopen(dev_id, "r");
624                 if (file == NULL)
625                         continue;
626 
627                 p = fgets(buf, sizeof(buf), file);
628                 if (p) {
629                         x = strchr(p, '\n');
630                         if (x)
631                                 *x = '\0';
632 
633                         if (!strcmp(p, guid)) {
634                                 /*
635                                  * Found the guid match; return the interface
636                                  * name. The caller will free the memory.
637                                  */
638                                 if_name = strdup(entry->d_name);
639                                 fclose(file);
640                                 break;
641                         }
642                 }
643                 fclose(file);
644         }
645 
646         closedir(dir);
647         return if_name;
648 }
649 
650 /*
651  * Retrieve the MAC address given the interface name.
652  */
653 
654 static char *kvp_if_name_to_mac(char *if_name)
655 {
656         FILE    *file;
657         char    *p, *x;
658         char    buf[256];
659         char addr_file[256];
660         unsigned int i;
661         char *mac_addr = NULL;
662 
663         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
664                 if_name, "/address");
665 
666         file = fopen(addr_file, "r");
667         if (file == NULL)
668                 return NULL;
669 
670         p = fgets(buf, sizeof(buf), file);
671         if (p) {
672                 x = strchr(p, '\n');
673                 if (x)
674                         *x = '\0';
675                 for (i = 0; i < strlen(p); i++)
676                         p[i] = toupper(p[i]);
677                 mac_addr = strdup(p);
678         }
679 
680         fclose(file);
681         return mac_addr;
682 }
683 
684 
685 /*
686  * Retrieve the interface name given tha MAC address.
687  */
688 
689 static char *kvp_mac_to_if_name(char *mac)
690 {
691         DIR *dir;
692         struct dirent *entry;
693         FILE    *file;
694         char    *p, *q, *x;
695         char    *if_name = NULL;
696         char    buf[256];
697         char *kvp_net_dir = "/sys/class/net/";
698         char dev_id[256];
699         unsigned int i;
700 
701         dir = opendir(kvp_net_dir);
702         if (dir == NULL)
703                 return NULL;
704 
705         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
706         q = dev_id + strlen(kvp_net_dir);
707 
708         while ((entry = readdir(dir)) != NULL) {
709                 /*
710                  * Set the state for the next pass.
711                  */
712                 *q = '\0';
713 
714                 strcat(dev_id, entry->d_name);
715                 strcat(dev_id, "/address");
716 
717                 file = fopen(dev_id, "r");
718                 if (file == NULL)
719                         continue;
720 
721                 p = fgets(buf, sizeof(buf), file);
722                 if (p) {
723                         x = strchr(p, '\n');
724                         if (x)
725                                 *x = '\0';
726 
727                         for (i = 0; i < strlen(p); i++)
728                                 p[i] = toupper(p[i]);
729 
730                         if (!strcmp(p, mac)) {
731                                 /*
732                                  * Found the MAC match; return the interface
733                                  * name. The caller will free the memory.
734                                  */
735                                 if_name = strdup(entry->d_name);
736                                 fclose(file);
737                                 break;
738                         }
739                 }
740                 fclose(file);
741         }
742 
743         closedir(dir);
744         return if_name;
745 }
746 
747 
748 static void kvp_process_ipconfig_file(char *cmd,
749                                         char *config_buf, unsigned int len,
750                                         int element_size, int offset)
751 {
752         char buf[256];
753         char *p;
754         char *x;
755         FILE *file;
756 
757         /*
758          * First execute the command.
759          */
760         file = popen(cmd, "r");
761         if (file == NULL)
762                 return;
763 
764         if (offset == 0)
765                 memset(config_buf, 0, len);
766         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
767                 if (len < strlen(config_buf) + element_size + 1)
768                         break;
769 
770                 x = strchr(p, '\n');
771                 if (x)
772                         *x = '\0';
773 
774                 strcat(config_buf, p);
775                 strcat(config_buf, ";");
776         }
777         pclose(file);
778 }
779 
780 static void kvp_get_ipconfig_info(char *if_name,
781                                  struct hv_kvp_ipaddr_value *buffer)
782 {
783         char cmd[512];
784         char dhcp_info[128];
785         char *p;
786         FILE *file;
787 
788         /*
789          * Get the address of default gateway (ipv4).
790          */
791         sprintf(cmd, "%s %s", "ip route show dev", if_name);
792         strcat(cmd, " | awk '/default/ {print $3 }'");
793 
794         /*
795          * Execute the command to gather gateway info.
796          */
797         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
798                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
799 
800         /*
801          * Get the address of default gateway (ipv6).
802          */
803         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
804         strcat(cmd, " | awk '/default/ {print $3 }'");
805 
806         /*
807          * Execute the command to gather gateway info (ipv6).
808          */
809         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
810                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
811 
812 
813         /*
814          * Gather the DNS  state.
815          * Since there is no standard way to get this information
816          * across various distributions of interest; we just invoke
817          * an external script that needs to be ported across distros
818          * of interest.
819          *
820          * Following is the expected format of the information from the script:
821          *
822          * ipaddr1 (nameserver1)
823          * ipaddr2 (nameserver2)
824          * .
825          * .
826          */
827 
828         sprintf(cmd, "%s",  "hv_get_dns_info");
829 
830         /*
831          * Execute the command to gather DNS info.
832          */
833         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
834                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
835 
836         /*
837          * Gather the DHCP state.
838          * We will gather this state by invoking an external script.
839          * The parameter to the script is the interface name.
840          * Here is the expected output:
841          *
842          * Enabled: DHCP enabled.
843          */
844 
845         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
846 
847         file = popen(cmd, "r");
848         if (file == NULL)
849                 return;
850 
851         p = fgets(dhcp_info, sizeof(dhcp_info), file);
852         if (p == NULL) {
853                 pclose(file);
854                 return;
855         }
856 
857         if (!strncmp(p, "Enabled", 7))
858                 buffer->dhcp_enabled = 1;
859         else
860                 buffer->dhcp_enabled = 0;
861 
862         pclose(file);
863 }
864 
865 
866 static unsigned int hweight32(unsigned int *w)
867 {
868         unsigned int res = *w - ((*w >> 1) & 0x55555555);
869         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
870         res = (res + (res >> 4)) & 0x0F0F0F0F;
871         res = res + (res >> 8);
872         return (res + (res >> 16)) & 0x000000FF;
873 }
874 
875 static int kvp_process_ip_address(void *addrp,
876                                 int family, char *buffer,
877                                 int length,  int *offset)
878 {
879         struct sockaddr_in *addr;
880         struct sockaddr_in6 *addr6;
881         int addr_length;
882         char tmp[50];
883         const char *str;
884 
885         if (family == AF_INET) {
886                 addr = (struct sockaddr_in *)addrp;
887                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
888                 addr_length = INET_ADDRSTRLEN;
889         } else {
890                 addr6 = (struct sockaddr_in6 *)addrp;
891                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
892                 addr_length = INET6_ADDRSTRLEN;
893         }
894 
895         if ((length - *offset) < addr_length + 2)
896                 return HV_E_FAIL;
897         if (str == NULL) {
898                 strcpy(buffer, "inet_ntop failed\n");
899                 return HV_E_FAIL;
900         }
901         if (*offset == 0)
902                 strcpy(buffer, tmp);
903         else {
904                 strcat(buffer, ";");
905                 strcat(buffer, tmp);
906         }
907 
908         *offset += strlen(str) + 1;
909 
910         return 0;
911 }
912 
913 static int
914 kvp_get_ip_info(int family, char *if_name, int op,
915                  void  *out_buffer, unsigned int length)
916 {
917         struct ifaddrs *ifap;
918         struct ifaddrs *curp;
919         int offset = 0;
920         int sn_offset = 0;
921         int error = 0;
922         char *buffer;
923         struct hv_kvp_ipaddr_value *ip_buffer;
924         char cidr_mask[5]; /* /xyz */
925         int weight;
926         int i;
927         unsigned int *w;
928         char *sn_str;
929         struct sockaddr_in6 *addr6;
930 
931         if (op == KVP_OP_ENUMERATE) {
932                 buffer = out_buffer;
933         } else {
934                 ip_buffer = out_buffer;
935                 buffer = (char *)ip_buffer->ip_addr;
936                 ip_buffer->addr_family = 0;
937         }
938         /*
939          * On entry into this function, the buffer is capable of holding the
940          * maximum key value.
941          */
942 
943         if (getifaddrs(&ifap)) {
944                 strcpy(buffer, "getifaddrs failed\n");
945                 return HV_E_FAIL;
946         }
947 
948         curp = ifap;
949         while (curp != NULL) {
950                 if (curp->ifa_addr == NULL) {
951                         curp = curp->ifa_next;
952                         continue;
953                 }
954 
955                 if ((if_name != NULL) &&
956                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
957                         /*
958                          * We want info about a specific interface;
959                          * just continue.
960                          */
961                         curp = curp->ifa_next;
962                         continue;
963                 }
964 
965                 /*
966                  * We only support two address families: AF_INET and AF_INET6.
967                  * If a family value of 0 is specified, we collect both
968                  * supported address families; if not we gather info on
969                  * the specified address family.
970                  */
971                 if ((((family != 0) &&
972                          (curp->ifa_addr->sa_family != family))) ||
973                          (curp->ifa_flags & IFF_LOOPBACK)) {
974                         curp = curp->ifa_next;
975                         continue;
976                 }
977                 if ((curp->ifa_addr->sa_family != AF_INET) &&
978                         (curp->ifa_addr->sa_family != AF_INET6)) {
979                         curp = curp->ifa_next;
980                         continue;
981                 }
982 
983                 if (op == KVP_OP_GET_IP_INFO) {
984                         /*
985                          * Gather info other than the IP address.
986                          * IP address info will be gathered later.
987                          */
988                         if (curp->ifa_addr->sa_family == AF_INET) {
989                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
990                                 /*
991                                  * Get subnet info.
992                                  */
993                                 error = kvp_process_ip_address(
994                                                              curp->ifa_netmask,
995                                                              AF_INET,
996                                                              (char *)
997                                                              ip_buffer->sub_net,
998                                                              length,
999                                                              &sn_offset);
1000                                 if (error)
1001                                         goto gather_ipaddr;
1002                         } else {
1003                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1004 
1005                                 /*
1006                                  * Get subnet info in CIDR format.
1007                                  */
1008                                 weight = 0;
1009                                 sn_str = (char *)ip_buffer->sub_net;
1010                                 addr6 = (struct sockaddr_in6 *)
1011                                         curp->ifa_netmask;
1012                                 w = addr6->sin6_addr.s6_addr32;
1013 
1014                                 for (i = 0; i < 4; i++)
1015                                         weight += hweight32(&w[i]);
1016 
1017                                 sprintf(cidr_mask, "/%d", weight);
1018                                 if (length < sn_offset + strlen(cidr_mask) + 1)
1019                                         goto gather_ipaddr;
1020 
1021                                 if (sn_offset == 0)
1022                                         strcpy(sn_str, cidr_mask);
1023                                 else {
1024                                         strcat((char *)ip_buffer->sub_net, ";");
1025                                         strcat(sn_str, cidr_mask);
1026                                 }
1027                                 sn_offset += strlen(sn_str) + 1;
1028                         }
1029 
1030                         /*
1031                          * Collect other ip related configuration info.
1032                          */
1033 
1034                         kvp_get_ipconfig_info(if_name, ip_buffer);
1035                 }
1036 
1037 gather_ipaddr:
1038                 error = kvp_process_ip_address(curp->ifa_addr,
1039                                                 curp->ifa_addr->sa_family,
1040                                                 buffer,
1041                                                 length, &offset);
1042                 if (error)
1043                         goto getaddr_done;
1044 
1045                 curp = curp->ifa_next;
1046         }
1047 
1048 getaddr_done:
1049         freeifaddrs(ifap);
1050         return error;
1051 }
1052 
1053 
1054 static int expand_ipv6(char *addr, int type)
1055 {
1056         int ret;
1057         struct in6_addr v6_addr;
1058 
1059         ret = inet_pton(AF_INET6, addr, &v6_addr);
1060 
1061         if (ret != 1) {
1062                 if (type == NETMASK)
1063                         return 1;
1064                 return 0;
1065         }
1066 
1067         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1068                 "%02x%02x:%02x%02x:%02x%02x",
1069                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1070                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1071                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1072                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1073                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1074                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1075                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1076                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1077 
1078         return 1;
1079 
1080 }
1081 
1082 static int is_ipv4(char *addr)
1083 {
1084         int ret;
1085         struct in_addr ipv4_addr;
1086 
1087         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1088 
1089         if (ret == 1)
1090                 return 1;
1091         return 0;
1092 }
1093 
1094 static int parse_ip_val_buffer(char *in_buf, int *offset,
1095                                 char *out_buf, int out_len)
1096 {
1097         char *x;
1098         char *start;
1099 
1100         /*
1101          * in_buf has sequence of characters that are seperated by
1102          * the character ';'. The last sequence does not have the
1103          * terminating ";" character.
1104          */
1105         start = in_buf + *offset;
1106 
1107         x = strchr(start, ';');
1108         if (x)
1109                 *x = 0;
1110         else
1111                 x = start + strlen(start);
1112 
1113         if (strlen(start) != 0) {
1114                 int i = 0;
1115                 /*
1116                  * Get rid of leading spaces.
1117                  */
1118                 while (start[i] == ' ')
1119                         i++;
1120 
1121                 if ((x - start) <= out_len) {
1122                         strcpy(out_buf, (start + i));
1123                         *offset += (x - start) + 1;
1124                         return 1;
1125                 }
1126         }
1127         return 0;
1128 }
1129 
1130 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1131 {
1132         int ret;
1133 
1134         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1135 
1136         if (ret < 0)
1137                 return HV_E_FAIL;
1138 
1139         return 0;
1140 }
1141 
1142 
1143 static int process_ip_string(FILE *f, char *ip_string, int type)
1144 {
1145         int error = 0;
1146         char addr[INET6_ADDRSTRLEN];
1147         int i = 0;
1148         int j = 0;
1149         char str[256];
1150         char sub_str[10];
1151         int offset = 0;
1152 
1153         memset(addr, 0, sizeof(addr));
1154 
1155         while (parse_ip_val_buffer(ip_string, &offset, addr,
1156                                         (MAX_IP_ADDR_SIZE * 2))) {
1157 
1158                 sub_str[0] = 0;
1159                 if (is_ipv4(addr)) {
1160                         switch (type) {
1161                         case IPADDR:
1162                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1163                                 break;
1164                         case NETMASK:
1165                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1166                                 break;
1167                         case GATEWAY:
1168                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1169                                 break;
1170                         case DNS:
1171                                 snprintf(str, sizeof(str), "%s", "DNS");
1172                                 break;
1173                         }
1174 
1175                         if (type == DNS) {
1176                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1177                         } else if (type == GATEWAY && i == 0) {
1178                                 ++i;
1179                         } else {
1180                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1181                         }
1182 
1183 
1184                 } else if (expand_ipv6(addr, type)) {
1185                         switch (type) {
1186                         case IPADDR:
1187                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1188                                 break;
1189                         case NETMASK:
1190                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1191                                 break;
1192                         case GATEWAY:
1193                                 snprintf(str, sizeof(str), "%s",
1194                                         "IPV6_DEFAULTGW");
1195                                 break;
1196                         case DNS:
1197                                 snprintf(str, sizeof(str), "%s",  "DNS");
1198                                 break;
1199                         }
1200 
1201                         if (type == DNS) {
1202                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1203                         } else if (j == 0) {
1204                                 ++j;
1205                         } else {
1206                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1207                         }
1208                 } else {
1209                         return  HV_INVALIDARG;
1210                 }
1211 
1212                 error = kvp_write_file(f, str, sub_str, addr);
1213                 if (error)
1214                         return error;
1215                 memset(addr, 0, sizeof(addr));
1216         }
1217 
1218         return 0;
1219 }
1220 
1221 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1222 {
1223         int error = 0;
1224         char if_file[128];
1225         FILE *file;
1226         char cmd[512];
1227         char *mac_addr;
1228 
1229         /*
1230          * Set the configuration for the specified interface with
1231          * the information provided. Since there is no standard
1232          * way to configure an interface, we will have an external
1233          * script that does the job of configuring the interface and
1234          * flushing the configuration.
1235          *
1236          * The parameters passed to this external script are:
1237          * 1. A configuration file that has the specified configuration.
1238          *
1239          * We will embed the name of the interface in the configuration
1240          * file: ifcfg-ethx (where ethx is the interface name).
1241          *
1242          * The information provided here may be more than what is needed
1243          * in a given distro to configure the interface and so are free
1244          * ignore information that may not be relevant.
1245          *
1246          * Here is the format of the ip configuration file:
1247          *
1248          * HWADDR=macaddr
1249          * DEVICE=interface name
1250          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1251          *                       or "none" if no boot-time protocol should be used)
1252          *
1253          * IPADDR0=ipaddr1
1254          * IPADDR1=ipaddr2
1255          * IPADDRx=ipaddry (where y = x + 1)
1256          *
1257          * NETMASK0=netmask1
1258          * NETMASKx=netmasky (where y = x + 1)
1259          *
1260          * GATEWAY=ipaddr1
1261          * GATEWAYx=ipaddry (where y = x + 1)
1262          *
1263          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1264          *
1265          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1266          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1267          * IPV6NETMASK.
1268          *
1269          * The host can specify multiple ipv4 and ipv6 addresses to be
1270          * configured for the interface. Furthermore, the configuration
1271          * needs to be persistent. A subsequent GET call on the interface
1272          * is expected to return the configuration that is set via the SET
1273          * call.
1274          */
1275 
1276         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1277                 "/ifcfg-", if_name);
1278 
1279         file = fopen(if_file, "w");
1280 
1281         if (file == NULL) {
1282                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1283                                 errno, strerror(errno));
1284                 return HV_E_FAIL;
1285         }
1286 
1287         /*
1288          * First write out the MAC address.
1289          */
1290 
1291         mac_addr = kvp_if_name_to_mac(if_name);
1292         if (mac_addr == NULL) {
1293                 error = HV_E_FAIL;
1294                 goto setval_error;
1295         }
1296 
1297         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1298         free(mac_addr);
1299         if (error)
1300                 goto setval_error;
1301 
1302         error = kvp_write_file(file, "DEVICE", "", if_name);
1303         if (error)
1304                 goto setval_error;
1305 
1306         /*
1307          * The dhcp_enabled flag is only for IPv4. In the case the host only
1308          * injects an IPv6 address, the flag is true, but we still need to
1309          * proceed to parse and pass the IPv6 information to the
1310          * disto-specific script hv_set_ifconfig.
1311          */
1312         if (new_val->dhcp_enabled) {
1313                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1314                 if (error)
1315                         goto setval_error;
1316 
1317         } else {
1318                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1319                 if (error)
1320                         goto setval_error;
1321         }
1322 
1323         /*
1324          * Write the configuration for ipaddress, netmask, gateway and
1325          * name servers.
1326          */
1327 
1328         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1329         if (error)
1330                 goto setval_error;
1331 
1332         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1333         if (error)
1334                 goto setval_error;
1335 
1336         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1337         if (error)
1338                 goto setval_error;
1339 
1340         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1341         if (error)
1342                 goto setval_error;
1343 
1344         fclose(file);
1345 
1346         /*
1347          * Now that we have populated the configuration file,
1348          * invoke the external script to do its magic.
1349          */
1350 
1351         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1352         if (system(cmd)) {
1353                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1354                                 cmd, errno, strerror(errno));
1355                 return HV_E_FAIL;
1356         }
1357         return 0;
1358 
1359 setval_error:
1360         syslog(LOG_ERR, "Failed to write config file");
1361         fclose(file);
1362         return error;
1363 }
1364 
1365 
1366 static void
1367 kvp_get_domain_name(char *buffer, int length)
1368 {
1369         struct addrinfo hints, *info ;
1370         int error = 0;
1371 
1372         gethostname(buffer, length);
1373         memset(&hints, 0, sizeof(hints));
1374         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1375         hints.ai_socktype = SOCK_STREAM;
1376         hints.ai_flags = AI_CANONNAME;
1377 
1378         error = getaddrinfo(buffer, NULL, &hints, &info);
1379         if (error != 0) {
1380                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1381                         error, gai_strerror(error));
1382                 return;
1383         }
1384         snprintf(buffer, length, "%s", info->ai_canonname);
1385         freeaddrinfo(info);
1386 }
1387 
1388 void print_usage(char *argv[])
1389 {
1390         fprintf(stderr, "Usage: %s [options]\n"
1391                 "Options are:\n"
1392                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1393                 "  -h, --help             print this help\n", argv[0]);
1394 }
1395 
1396 int main(int argc, char *argv[])
1397 {
1398         int kvp_fd, len;
1399         int error;
1400         struct pollfd pfd;
1401         char    *p;
1402         struct hv_kvp_msg hv_msg[1];
1403         char    *key_value;
1404         char    *key_name;
1405         int     op;
1406         int     pool;
1407         char    *if_name;
1408         struct hv_kvp_ipaddr_value *kvp_ip_val;
1409         int daemonize = 1, long_index = 0, opt;
1410 
1411         static struct option long_options[] = {
1412                 {"help",        no_argument,       0,  'h' },
1413                 {"no-daemon",   no_argument,       0,  'n' },
1414                 {0,             0,                 0,  0   }
1415         };
1416 
1417         while ((opt = getopt_long(argc, argv, "hn", long_options,
1418                                   &long_index)) != -1) {
1419                 switch (opt) {
1420                 case 'n':
1421                         daemonize = 0;
1422                         break;
1423                 case 'h':
1424                 default:
1425                         print_usage(argv);
1426                         exit(EXIT_FAILURE);
1427                 }
1428         }
1429 
1430         if (daemonize && daemon(1, 0))
1431                 return 1;
1432 
1433         openlog("KVP", 0, LOG_USER);
1434         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1435 
1436         kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR);
1437 
1438         if (kvp_fd < 0) {
1439                 syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1440                         errno, strerror(errno));
1441                 exit(EXIT_FAILURE);
1442         }
1443 
1444         /*
1445          * Retrieve OS release information.
1446          */
1447         kvp_get_os_info();
1448         /*
1449          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1450          * unpredictable amount of time to finish.
1451          */
1452         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1453 
1454         if (kvp_file_init()) {
1455                 syslog(LOG_ERR, "Failed to initialize the pools");
1456                 exit(EXIT_FAILURE);
1457         }
1458 
1459         /*
1460          * Register ourselves with the kernel.
1461          */
1462         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1463         len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1464         if (len != sizeof(struct hv_kvp_msg)) {
1465                 syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1466                        errno, strerror(errno));
1467                 close(kvp_fd);
1468                 exit(EXIT_FAILURE);
1469         }
1470 
1471         pfd.fd = kvp_fd;
1472 
1473         while (1) {
1474                 pfd.events = POLLIN;
1475                 pfd.revents = 0;
1476 
1477                 if (poll(&pfd, 1, -1) < 0) {
1478                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1479                         if (errno == EINVAL) {
1480                                 close(kvp_fd);
1481                                 exit(EXIT_FAILURE);
1482                         }
1483                         else
1484                                 continue;
1485                 }
1486 
1487                 len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1488 
1489                 if (len != sizeof(struct hv_kvp_msg)) {
1490                         syslog(LOG_ERR, "read failed; error:%d %s",
1491                                errno, strerror(errno));
1492 
1493                         close(kvp_fd);
1494                         return EXIT_FAILURE;
1495                 }
1496 
1497                 /*
1498                  * We will use the KVP header information to pass back
1499                  * the error from this daemon. So, first copy the state
1500                  * and set the error code to success.
1501                  */
1502                 op = hv_msg->kvp_hdr.operation;
1503                 pool = hv_msg->kvp_hdr.pool;
1504                 hv_msg->error = HV_S_OK;
1505 
1506                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1507                         /*
1508                          * Driver is registering with us; stash away the version
1509                          * information.
1510                          */
1511                         in_hand_shake = 0;
1512                         p = (char *)hv_msg->body.kvp_register.version;
1513                         lic_version = malloc(strlen(p) + 1);
1514                         if (lic_version) {
1515                                 strcpy(lic_version, p);
1516                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1517                                        lic_version);
1518                         } else {
1519                                 syslog(LOG_ERR, "malloc failed");
1520                         }
1521                         continue;
1522                 }
1523 
1524                 switch (op) {
1525                 case KVP_OP_GET_IP_INFO:
1526                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1527                         if_name =
1528                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1529 
1530                         if (if_name == NULL) {
1531                                 /*
1532                                  * We could not map the mac address to an
1533                                  * interface name; return error.
1534                                  */
1535                                 hv_msg->error = HV_E_FAIL;
1536                                 break;
1537                         }
1538                         error = kvp_get_ip_info(
1539                                                 0, if_name, KVP_OP_GET_IP_INFO,
1540                                                 kvp_ip_val,
1541                                                 (MAX_IP_ADDR_SIZE * 2));
1542 
1543                         if (error)
1544                                 hv_msg->error = error;
1545 
1546                         free(if_name);
1547                         break;
1548 
1549                 case KVP_OP_SET_IP_INFO:
1550                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1551                         if_name = kvp_get_if_name(
1552                                         (char *)kvp_ip_val->adapter_id);
1553                         if (if_name == NULL) {
1554                                 /*
1555                                  * We could not map the guid to an
1556                                  * interface name; return error.
1557                                  */
1558                                 hv_msg->error = HV_GUID_NOTFOUND;
1559                                 break;
1560                         }
1561                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1562                         if (error)
1563                                 hv_msg->error = error;
1564 
1565                         free(if_name);
1566                         break;
1567 
1568                 case KVP_OP_SET:
1569                         if (kvp_key_add_or_modify(pool,
1570                                         hv_msg->body.kvp_set.data.key,
1571                                         hv_msg->body.kvp_set.data.key_size,
1572                                         hv_msg->body.kvp_set.data.value,
1573                                         hv_msg->body.kvp_set.data.value_size))
1574                                         hv_msg->error = HV_S_CONT;
1575                         break;
1576 
1577                 case KVP_OP_GET:
1578                         if (kvp_get_value(pool,
1579                                         hv_msg->body.kvp_set.data.key,
1580                                         hv_msg->body.kvp_set.data.key_size,
1581                                         hv_msg->body.kvp_set.data.value,
1582                                         hv_msg->body.kvp_set.data.value_size))
1583                                         hv_msg->error = HV_S_CONT;
1584                         break;
1585 
1586                 case KVP_OP_DELETE:
1587                         if (kvp_key_delete(pool,
1588                                         hv_msg->body.kvp_delete.key,
1589                                         hv_msg->body.kvp_delete.key_size))
1590                                         hv_msg->error = HV_S_CONT;
1591                         break;
1592 
1593                 default:
1594                         break;
1595                 }
1596 
1597                 if (op != KVP_OP_ENUMERATE)
1598                         goto kvp_done;
1599 
1600                 /*
1601                  * If the pool is KVP_POOL_AUTO, dynamically generate
1602                  * both the key and the value; if not read from the
1603                  * appropriate pool.
1604                  */
1605                 if (pool != KVP_POOL_AUTO) {
1606                         if (kvp_pool_enumerate(pool,
1607                                         hv_msg->body.kvp_enum_data.index,
1608                                         hv_msg->body.kvp_enum_data.data.key,
1609                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1610                                         hv_msg->body.kvp_enum_data.data.value,
1611                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1612                                         hv_msg->error = HV_S_CONT;
1613                         goto kvp_done;
1614                 }
1615 
1616                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1617                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1618 
1619                 switch (hv_msg->body.kvp_enum_data.index) {
1620                 case FullyQualifiedDomainName:
1621                         strcpy(key_value, full_domain_name);
1622                         strcpy(key_name, "FullyQualifiedDomainName");
1623                         break;
1624                 case IntegrationServicesVersion:
1625                         strcpy(key_name, "IntegrationServicesVersion");
1626                         strcpy(key_value, lic_version);
1627                         break;
1628                 case NetworkAddressIPv4:
1629                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1630                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1631                         strcpy(key_name, "NetworkAddressIPv4");
1632                         break;
1633                 case NetworkAddressIPv6:
1634                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1635                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1636                         strcpy(key_name, "NetworkAddressIPv6");
1637                         break;
1638                 case OSBuildNumber:
1639                         strcpy(key_value, os_build);
1640                         strcpy(key_name, "OSBuildNumber");
1641                         break;
1642                 case OSName:
1643                         strcpy(key_value, os_name);
1644                         strcpy(key_name, "OSName");
1645                         break;
1646                 case OSMajorVersion:
1647                         strcpy(key_value, os_major);
1648                         strcpy(key_name, "OSMajorVersion");
1649                         break;
1650                 case OSMinorVersion:
1651                         strcpy(key_value, os_minor);
1652                         strcpy(key_name, "OSMinorVersion");
1653                         break;
1654                 case OSVersion:
1655                         strcpy(key_value, os_version);
1656                         strcpy(key_name, "OSVersion");
1657                         break;
1658                 case ProcessorArchitecture:
1659                         strcpy(key_value, processor_arch);
1660                         strcpy(key_name, "ProcessorArchitecture");
1661                         break;
1662                 default:
1663                         hv_msg->error = HV_S_CONT;
1664                         break;
1665                 }
1666 
1667                 /* Send the value back to the kernel. */
1668 kvp_done:
1669                 len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1670                 if (len != sizeof(struct hv_kvp_msg)) {
1671                         syslog(LOG_ERR, "write failed; error: %d %s", errno,
1672                                strerror(errno));
1673                         exit(EXIT_FAILURE);
1674                 }
1675         }
1676 
1677         close(kvp_fd);
1678         exit(0);
1679 }
1680 

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