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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 <linux/types.h>
 30 #include <stdio.h>
 31 #include <stdlib.h>
 32 #include <unistd.h>
 33 #include <string.h>
 34 #include <ctype.h>
 35 #include <errno.h>
 36 #include <arpa/inet.h>
 37 #include <linux/connector.h>
 38 #include <linux/hyperv.h>
 39 #include <linux/netlink.h>
 40 #include <ifaddrs.h>
 41 #include <netdb.h>
 42 #include <syslog.h>
 43 #include <sys/stat.h>
 44 #include <fcntl.h>
 45 #include <dirent.h>
 46 #include <net/if.h>
 47 
 48 /*
 49  * KVP protocol: The user mode component first registers with the
 50  * the kernel component. Subsequently, the kernel component requests, data
 51  * for the specified keys. In response to this message the user mode component
 52  * fills in the value corresponding to the specified key. We overload the
 53  * sequence field in the cn_msg header to define our KVP message types.
 54  *
 55  * We use this infrastructure for also supporting queries from user mode
 56  * application for state that may be maintained in the KVP kernel component.
 57  *
 58  */
 59 
 60 
 61 enum key_index {
 62         FullyQualifiedDomainName = 0,
 63         IntegrationServicesVersion, /*This key is serviced in the kernel*/
 64         NetworkAddressIPv4,
 65         NetworkAddressIPv6,
 66         OSBuildNumber,
 67         OSName,
 68         OSMajorVersion,
 69         OSMinorVersion,
 70         OSVersion,
 71         ProcessorArchitecture
 72 };
 73 
 74 
 75 enum {
 76         IPADDR = 0,
 77         NETMASK,
 78         GATEWAY,
 79         DNS
 80 };
 81 
 82 static struct sockaddr_nl addr;
 83 static int in_hand_shake = 1;
 84 
 85 static char *os_name = "";
 86 static char *os_major = "";
 87 static char *os_minor = "";
 88 static char *processor_arch;
 89 static char *os_build;
 90 static char *os_version;
 91 static char *lic_version = "Unknown version";
 92 static struct utsname uts_buf;
 93 
 94 /*
 95  * The location of the interface configuration file.
 96  */
 97 
 98 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
 99 
100 #define MAX_FILE_NAME 100
101 #define ENTRIES_PER_BLOCK 50
102 
103 #ifndef SOL_NETLINK
104 #define SOL_NETLINK 270
105 #endif
106 
107 struct kvp_record {
108         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
109         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
110 };
111 
112 struct kvp_file_state {
113         int fd;
114         int num_blocks;
115         struct kvp_record *records;
116         int num_records;
117         char fname[MAX_FILE_NAME];
118 };
119 
120 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
121 
122 static void kvp_acquire_lock(int pool)
123 {
124         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
125         fl.l_pid = getpid();
126 
127         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
128                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
129                                 errno, strerror(errno));
130                 exit(EXIT_FAILURE);
131         }
132 }
133 
134 static void kvp_release_lock(int pool)
135 {
136         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
137         fl.l_pid = getpid();
138 
139         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
140                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
141                                 errno, strerror(errno));
142                 exit(EXIT_FAILURE);
143         }
144 }
145 
146 static void kvp_update_file(int pool)
147 {
148         FILE *filep;
149         size_t bytes_written;
150 
151         /*
152          * We are going to write our in-memory registry out to
153          * disk; acquire the lock first.
154          */
155         kvp_acquire_lock(pool);
156 
157         filep = fopen(kvp_file_info[pool].fname, "we");
158         if (!filep) {
159                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
160                                 errno, strerror(errno));
161                 kvp_release_lock(pool);
162                 exit(EXIT_FAILURE);
163         }
164 
165         bytes_written = fwrite(kvp_file_info[pool].records,
166                                 sizeof(struct kvp_record),
167                                 kvp_file_info[pool].num_records, filep);
168 
169         if (ferror(filep) || fclose(filep)) {
170                 kvp_release_lock(pool);
171                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
172                 exit(EXIT_FAILURE);
173         }
174 
175         kvp_release_lock(pool);
176 }
177 
178 static void kvp_update_mem_state(int pool)
179 {
180         FILE *filep;
181         size_t records_read = 0;
182         struct kvp_record *record = kvp_file_info[pool].records;
183         struct kvp_record *readp;
184         int num_blocks = kvp_file_info[pool].num_blocks;
185         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
186 
187         kvp_acquire_lock(pool);
188 
189         filep = fopen(kvp_file_info[pool].fname, "re");
190         if (!filep) {
191                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
192                                 errno, strerror(errno));
193                 kvp_release_lock(pool);
194                 exit(EXIT_FAILURE);
195         }
196         for (;;) {
197                 readp = &record[records_read];
198                 records_read += fread(readp, sizeof(struct kvp_record),
199                                         ENTRIES_PER_BLOCK * num_blocks,
200                                         filep);
201 
202                 if (ferror(filep)) {
203                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
204                         exit(EXIT_FAILURE);
205                 }
206 
207                 if (!feof(filep)) {
208                         /*
209                          * We have more data to read.
210                          */
211                         num_blocks++;
212                         record = realloc(record, alloc_unit * num_blocks);
213 
214                         if (record == NULL) {
215                                 syslog(LOG_ERR, "malloc failed");
216                                 exit(EXIT_FAILURE);
217                         }
218                         continue;
219                 }
220                 break;
221         }
222 
223         kvp_file_info[pool].num_blocks = num_blocks;
224         kvp_file_info[pool].records = record;
225         kvp_file_info[pool].num_records = records_read;
226 
227         fclose(filep);
228         kvp_release_lock(pool);
229 }
230 static int kvp_file_init(void)
231 {
232         int  fd;
233         FILE *filep;
234         size_t records_read;
235         char *fname;
236         struct kvp_record *record;
237         struct kvp_record *readp;
238         int num_blocks;
239         int i;
240         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
241 
242         if (access(KVP_CONFIG_LOC, F_OK)) {
243                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
244                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
245                                         errno, strerror(errno));
246                         exit(EXIT_FAILURE);
247                 }
248         }
249 
250         for (i = 0; i < KVP_POOL_COUNT; i++) {
251                 fname = kvp_file_info[i].fname;
252                 records_read = 0;
253                 num_blocks = 1;
254                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
255                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
256 
257                 if (fd == -1)
258                         return 1;
259 
260 
261                 filep = fopen(fname, "re");
262                 if (!filep) {
263                         close(fd);
264                         return 1;
265                 }
266 
267                 record = malloc(alloc_unit * num_blocks);
268                 if (record == NULL) {
269                         fclose(filep);
270                         close(fd);
271                         return 1;
272                 }
273                 for (;;) {
274                         readp = &record[records_read];
275                         records_read += fread(readp, sizeof(struct kvp_record),
276                                         ENTRIES_PER_BLOCK,
277                                         filep);
278 
279                         if (ferror(filep)) {
280                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
281                                        i);
282                                 exit(EXIT_FAILURE);
283                         }
284 
285                         if (!feof(filep)) {
286                                 /*
287                                  * We have more data to read.
288                                  */
289                                 num_blocks++;
290                                 record = realloc(record, alloc_unit *
291                                                 num_blocks);
292                                 if (record == NULL) {
293                                         fclose(filep);
294                                         close(fd);
295                                         return 1;
296                                 }
297                                 continue;
298                         }
299                         break;
300                 }
301                 kvp_file_info[i].fd = fd;
302                 kvp_file_info[i].num_blocks = num_blocks;
303                 kvp_file_info[i].records = record;
304                 kvp_file_info[i].num_records = records_read;
305                 fclose(filep);
306 
307         }
308 
309         return 0;
310 }
311 
312 static int kvp_key_delete(int pool, const char *key, int key_size)
313 {
314         int i;
315         int j, k;
316         int num_records;
317         struct kvp_record *record;
318 
319         /*
320          * First update the in-memory state.
321          */
322         kvp_update_mem_state(pool);
323 
324         num_records = kvp_file_info[pool].num_records;
325         record = kvp_file_info[pool].records;
326 
327         for (i = 0; i < num_records; i++) {
328                 if (memcmp(key, record[i].key, key_size))
329                         continue;
330                 /*
331                  * Found a match; just move the remaining
332                  * entries up.
333                  */
334                 if (i == num_records) {
335                         kvp_file_info[pool].num_records--;
336                         kvp_update_file(pool);
337                         return 0;
338                 }
339 
340                 j = i;
341                 k = j + 1;
342                 for (; k < num_records; k++) {
343                         strcpy(record[j].key, record[k].key);
344                         strcpy(record[j].value, record[k].value);
345                         j++;
346                 }
347 
348                 kvp_file_info[pool].num_records--;
349                 kvp_update_file(pool);
350                 return 0;
351         }
352         return 1;
353 }
354 
355 static int kvp_key_add_or_modify(int pool, const char *key, int key_size, const char *value,
356                         int value_size)
357 {
358         int i;
359         int num_records;
360         struct kvp_record *record;
361         int num_blocks;
362 
363         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
364                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
365                 return 1;
366 
367         /*
368          * First update the in-memory state.
369          */
370         kvp_update_mem_state(pool);
371 
372         num_records = kvp_file_info[pool].num_records;
373         record = kvp_file_info[pool].records;
374         num_blocks = kvp_file_info[pool].num_blocks;
375 
376         for (i = 0; i < num_records; i++) {
377                 if (memcmp(key, record[i].key, key_size))
378                         continue;
379                 /*
380                  * Found a match; just update the value -
381                  * this is the modify case.
382                  */
383                 memcpy(record[i].value, value, value_size);
384                 kvp_update_file(pool);
385                 return 0;
386         }
387 
388         /*
389          * Need to add a new entry;
390          */
391         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
392                 /* Need to allocate a larger array for reg entries. */
393                 record = realloc(record, sizeof(struct kvp_record) *
394                          ENTRIES_PER_BLOCK * (num_blocks + 1));
395 
396                 if (record == NULL)
397                         return 1;
398                 kvp_file_info[pool].num_blocks++;
399 
400         }
401         memcpy(record[i].value, value, value_size);
402         memcpy(record[i].key, key, key_size);
403         kvp_file_info[pool].records = record;
404         kvp_file_info[pool].num_records++;
405         kvp_update_file(pool);
406         return 0;
407 }
408 
409 static int kvp_get_value(int pool, const char *key, int key_size, char *value,
410                         int value_size)
411 {
412         int i;
413         int num_records;
414         struct kvp_record *record;
415 
416         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
417                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
418                 return 1;
419 
420         /*
421          * First update the in-memory state.
422          */
423         kvp_update_mem_state(pool);
424 
425         num_records = kvp_file_info[pool].num_records;
426         record = kvp_file_info[pool].records;
427 
428         for (i = 0; i < num_records; i++) {
429                 if (memcmp(key, record[i].key, key_size))
430                         continue;
431                 /*
432                  * Found a match; just copy the value out.
433                  */
434                 memcpy(value, record[i].value, value_size);
435                 return 0;
436         }
437 
438         return 1;
439 }
440 
441 static int kvp_pool_enumerate(int pool, int index, char *key, int key_size,
442                                 char *value, int value_size)
443 {
444         struct kvp_record *record;
445 
446         /*
447          * First update our in-memory database.
448          */
449         kvp_update_mem_state(pool);
450         record = kvp_file_info[pool].records;
451 
452         if (index >= kvp_file_info[pool].num_records) {
453                 return 1;
454         }
455 
456         memcpy(key, record[index].key, key_size);
457         memcpy(value, record[index].value, value_size);
458         return 0;
459 }
460 
461 
462 void kvp_get_os_info(void)
463 {
464         FILE    *file;
465         char    *p, buf[512];
466 
467         uname(&uts_buf);
468         os_version = uts_buf.release;
469         os_build = strdup(uts_buf.release);
470 
471         os_name = uts_buf.sysname;
472         processor_arch = uts_buf.machine;
473 
474         /*
475          * The current windows host (win7) expects the build
476          * string to be of the form: x.y.z
477          * Strip additional information we may have.
478          */
479         p = strchr(os_version, '-');
480         if (p)
481                 *p = '\0';
482 
483         /*
484          * Parse the /etc/os-release file if present:
485          * http://www.freedesktop.org/software/systemd/man/os-release.html
486          */
487         file = fopen("/etc/os-release", "r");
488         if (file != NULL) {
489                 while (fgets(buf, sizeof(buf), file)) {
490                         char *value, *q;
491 
492                         /* Ignore comments */
493                         if (buf[0] == '#')
494                                 continue;
495 
496                         /* Split into name=value */
497                         p = strchr(buf, '=');
498                         if (!p)
499                                 continue;
500                         *p++ = 0;
501 
502                         /* Remove quotes and newline; un-escape */
503                         value = p;
504                         q = p;
505                         while (*p) {
506                                 if (*p == '\\') {
507                                         ++p;
508                                         if (!*p)
509                                                 break;
510                                         *q++ = *p++;
511                                 } else if (*p == '\'' || *p == '"' ||
512                                            *p == '\n') {
513                                         ++p;
514                                 } else {
515                                         *q++ = *p++;
516                                 }
517                         }
518                         *q = 0;
519 
520                         if (!strcmp(buf, "NAME")) {
521                                 p = strdup(value);
522                                 if (!p)
523                                         break;
524                                 os_name = p;
525                         } else if (!strcmp(buf, "VERSION_ID")) {
526                                 p = strdup(value);
527                                 if (!p)
528                                         break;
529                                 os_major = p;
530                         }
531                 }
532                 fclose(file);
533                 return;
534         }
535 
536         /* Fallback for older RH/SUSE releases */
537         file = fopen("/etc/SuSE-release", "r");
538         if (file != NULL)
539                 goto kvp_osinfo_found;
540         file  = fopen("/etc/redhat-release", "r");
541         if (file != NULL)
542                 goto kvp_osinfo_found;
543 
544         /*
545          * We don't have information about the os.
546          */
547         return;
548 
549 kvp_osinfo_found:
550         /* up to three lines */
551         p = fgets(buf, sizeof(buf), file);
552         if (p) {
553                 p = strchr(buf, '\n');
554                 if (p)
555                         *p = '\0';
556                 p = strdup(buf);
557                 if (!p)
558                         goto done;
559                 os_name = p;
560 
561                 /* second line */
562                 p = fgets(buf, sizeof(buf), file);
563                 if (p) {
564                         p = strchr(buf, '\n');
565                         if (p)
566                                 *p = '\0';
567                         p = strdup(buf);
568                         if (!p)
569                                 goto done;
570                         os_major = p;
571 
572                         /* third line */
573                         p = fgets(buf, sizeof(buf), file);
574                         if (p)  {
575                                 p = strchr(buf, '\n');
576                                 if (p)
577                                         *p = '\0';
578                                 p = strdup(buf);
579                                 if (p)
580                                         os_minor = p;
581                         }
582                 }
583         }
584 
585 done:
586         fclose(file);
587         return;
588 }
589 
590 
591 
592 /*
593  * Retrieve an interface name corresponding to the specified guid.
594  * If there is a match, the function returns a pointer
595  * to the interface name and if not, a NULL is returned.
596  * If a match is found, the caller is responsible for
597  * freeing the memory.
598  */
599 
600 static char *kvp_get_if_name(char *guid)
601 {
602         DIR *dir;
603         struct dirent *entry;
604         FILE    *file;
605         char    *p, *q, *x;
606         char    *if_name = NULL;
607         char    buf[256];
608         char *kvp_net_dir = "/sys/class/net/";
609         char dev_id[256];
610 
611         dir = opendir(kvp_net_dir);
612         if (dir == NULL)
613                 return NULL;
614 
615         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
616         q = dev_id + strlen(kvp_net_dir);
617 
618         while ((entry = readdir(dir)) != NULL) {
619                 /*
620                  * Set the state for the next pass.
621                  */
622                 *q = '\0';
623                 strcat(dev_id, entry->d_name);
624                 strcat(dev_id, "/device/device_id");
625 
626                 file = fopen(dev_id, "r");
627                 if (file == NULL)
628                         continue;
629 
630                 p = fgets(buf, sizeof(buf), file);
631                 if (p) {
632                         x = strchr(p, '\n');
633                         if (x)
634                                 *x = '\0';
635 
636                         if (!strcmp(p, guid)) {
637                                 /*
638                                  * Found the guid match; return the interface
639                                  * name. The caller will free the memory.
640                                  */
641                                 if_name = strdup(entry->d_name);
642                                 fclose(file);
643                                 break;
644                         }
645                 }
646                 fclose(file);
647         }
648 
649         closedir(dir);
650         return if_name;
651 }
652 
653 /*
654  * Retrieve the MAC address given the interface name.
655  */
656 
657 static char *kvp_if_name_to_mac(char *if_name)
658 {
659         FILE    *file;
660         char    *p, *x;
661         char    buf[256];
662         char addr_file[256];
663         int i;
664         char *mac_addr = NULL;
665 
666         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
667                 if_name, "/address");
668 
669         file = fopen(addr_file, "r");
670         if (file == NULL)
671                 return NULL;
672 
673         p = fgets(buf, sizeof(buf), file);
674         if (p) {
675                 x = strchr(p, '\n');
676                 if (x)
677                         *x = '\0';
678                 for (i = 0; i < strlen(p); i++)
679                         p[i] = toupper(p[i]);
680                 mac_addr = strdup(p);
681         }
682 
683         fclose(file);
684         return mac_addr;
685 }
686 
687 
688 /*
689  * Retrieve the interface name given tha MAC address.
690  */
691 
692 static char *kvp_mac_to_if_name(char *mac)
693 {
694         DIR *dir;
695         struct dirent *entry;
696         FILE    *file;
697         char    *p, *q, *x;
698         char    *if_name = NULL;
699         char    buf[256];
700         char *kvp_net_dir = "/sys/class/net/";
701         char dev_id[256];
702         int i;
703 
704         dir = opendir(kvp_net_dir);
705         if (dir == NULL)
706                 return NULL;
707 
708         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
709         q = dev_id + strlen(kvp_net_dir);
710 
711         while ((entry = readdir(dir)) != NULL) {
712                 /*
713                  * Set the state for the next pass.
714                  */
715                 *q = '\0';
716 
717                 strcat(dev_id, entry->d_name);
718                 strcat(dev_id, "/address");
719 
720                 file = fopen(dev_id, "r");
721                 if (file == NULL)
722                         continue;
723 
724                 p = fgets(buf, sizeof(buf), file);
725                 if (p) {
726                         x = strchr(p, '\n');
727                         if (x)
728                                 *x = '\0';
729 
730                         for (i = 0; i < strlen(p); i++)
731                                 p[i] = toupper(p[i]);
732 
733                         if (!strcmp(p, mac)) {
734                                 /*
735                                  * Found the MAC match; return the interface
736                                  * name. The caller will free the memory.
737                                  */
738                                 if_name = strdup(entry->d_name);
739                                 fclose(file);
740                                 break;
741                         }
742                 }
743                 fclose(file);
744         }
745 
746         closedir(dir);
747         return if_name;
748 }
749 
750 
751 static void kvp_process_ipconfig_file(char *cmd,
752                                         char *config_buf, int len,
753                                         int element_size, int offset)
754 {
755         char buf[256];
756         char *p;
757         char *x;
758         FILE *file;
759 
760         /*
761          * First execute the command.
762          */
763         file = popen(cmd, "r");
764         if (file == NULL)
765                 return;
766 
767         if (offset == 0)
768                 memset(config_buf, 0, len);
769         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
770                 if ((len - strlen(config_buf)) < (element_size + 1))
771                         break;
772 
773                 x = strchr(p, '\n');
774                 if (x)
775                         *x = '\0';
776 
777                 strcat(config_buf, p);
778                 strcat(config_buf, ";");
779         }
780         pclose(file);
781 }
782 
783 static void kvp_get_ipconfig_info(char *if_name,
784                                  struct hv_kvp_ipaddr_value *buffer)
785 {
786         char cmd[512];
787         char dhcp_info[128];
788         char *p;
789         FILE *file;
790 
791         /*
792          * Get the address of default gateway (ipv4).
793          */
794         sprintf(cmd, "%s %s", "ip route show dev", if_name);
795         strcat(cmd, " | awk '/default/ {print $3 }'");
796 
797         /*
798          * Execute the command to gather gateway info.
799          */
800         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
801                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
802 
803         /*
804          * Get the address of default gateway (ipv6).
805          */
806         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
807         strcat(cmd, " | awk '/default/ {print $3 }'");
808 
809         /*
810          * Execute the command to gather gateway info (ipv6).
811          */
812         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
813                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
814 
815 
816         /*
817          * Gather the DNS  state.
818          * Since there is no standard way to get this information
819          * across various distributions of interest; we just invoke
820          * an external script that needs to be ported across distros
821          * of interest.
822          *
823          * Following is the expected format of the information from the script:
824          *
825          * ipaddr1 (nameserver1)
826          * ipaddr2 (nameserver2)
827          * .
828          * .
829          */
830 
831         sprintf(cmd, "%s",  "hv_get_dns_info");
832 
833         /*
834          * Execute the command to gather DNS info.
835          */
836         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
837                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
838 
839         /*
840          * Gather the DHCP state.
841          * We will gather this state by invoking an external script.
842          * The parameter to the script is the interface name.
843          * Here is the expected output:
844          *
845          * Enabled: DHCP enabled.
846          */
847 
848         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
849 
850         file = popen(cmd, "r");
851         if (file == NULL)
852                 return;
853 
854         p = fgets(dhcp_info, sizeof(dhcp_info), file);
855         if (p == NULL) {
856                 pclose(file);
857                 return;
858         }
859 
860         if (!strncmp(p, "Enabled", 7))
861                 buffer->dhcp_enabled = 1;
862         else
863                 buffer->dhcp_enabled = 0;
864 
865         pclose(file);
866 }
867 
868 
869 static unsigned int hweight32(unsigned int *w)
870 {
871         unsigned int res = *w - ((*w >> 1) & 0x55555555);
872         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
873         res = (res + (res >> 4)) & 0x0F0F0F0F;
874         res = res + (res >> 8);
875         return (res + (res >> 16)) & 0x000000FF;
876 }
877 
878 static int kvp_process_ip_address(void *addrp,
879                                 int family, char *buffer,
880                                 int length,  int *offset)
881 {
882         struct sockaddr_in *addr;
883         struct sockaddr_in6 *addr6;
884         int addr_length;
885         char tmp[50];
886         const char *str;
887 
888         if (family == AF_INET) {
889                 addr = (struct sockaddr_in *)addrp;
890                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
891                 addr_length = INET_ADDRSTRLEN;
892         } else {
893                 addr6 = (struct sockaddr_in6 *)addrp;
894                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
895                 addr_length = INET6_ADDRSTRLEN;
896         }
897 
898         if ((length - *offset) < addr_length + 2)
899                 return HV_E_FAIL;
900         if (str == NULL) {
901                 strcpy(buffer, "inet_ntop failed\n");
902                 return HV_E_FAIL;
903         }
904         if (*offset == 0)
905                 strcpy(buffer, tmp);
906         else {
907                 strcat(buffer, ";");
908                 strcat(buffer, tmp);
909         }
910 
911         *offset += strlen(str) + 1;
912 
913         return 0;
914 }
915 
916 static int
917 kvp_get_ip_info(int family, char *if_name, int op,
918                  void  *out_buffer, int length)
919 {
920         struct ifaddrs *ifap;
921         struct ifaddrs *curp;
922         int offset = 0;
923         int sn_offset = 0;
924         int error = 0;
925         char *buffer;
926         struct hv_kvp_ipaddr_value *ip_buffer;
927         char cidr_mask[5]; /* /xyz */
928         int weight;
929         int i;
930         unsigned int *w;
931         char *sn_str;
932         struct sockaddr_in6 *addr6;
933 
934         if (op == KVP_OP_ENUMERATE) {
935                 buffer = out_buffer;
936         } else {
937                 ip_buffer = out_buffer;
938                 buffer = (char *)ip_buffer->ip_addr;
939                 ip_buffer->addr_family = 0;
940         }
941         /*
942          * On entry into this function, the buffer is capable of holding the
943          * maximum key value.
944          */
945 
946         if (getifaddrs(&ifap)) {
947                 strcpy(buffer, "getifaddrs failed\n");
948                 return HV_E_FAIL;
949         }
950 
951         curp = ifap;
952         while (curp != NULL) {
953                 if (curp->ifa_addr == NULL) {
954                         curp = curp->ifa_next;
955                         continue;
956                 }
957 
958                 if ((if_name != NULL) &&
959                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
960                         /*
961                          * We want info about a specific interface;
962                          * just continue.
963                          */
964                         curp = curp->ifa_next;
965                         continue;
966                 }
967 
968                 /*
969                  * We only support two address families: AF_INET and AF_INET6.
970                  * If a family value of 0 is specified, we collect both
971                  * supported address families; if not we gather info on
972                  * the specified address family.
973                  */
974                 if ((((family != 0) &&
975                          (curp->ifa_addr->sa_family != family))) ||
976                          (curp->ifa_flags & IFF_LOOPBACK)) {
977                         curp = curp->ifa_next;
978                         continue;
979                 }
980                 if ((curp->ifa_addr->sa_family != AF_INET) &&
981                         (curp->ifa_addr->sa_family != AF_INET6)) {
982                         curp = curp->ifa_next;
983                         continue;
984                 }
985 
986                 if (op == KVP_OP_GET_IP_INFO) {
987                         /*
988                          * Gather info other than the IP address.
989                          * IP address info will be gathered later.
990                          */
991                         if (curp->ifa_addr->sa_family == AF_INET) {
992                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
993                                 /*
994                                  * Get subnet info.
995                                  */
996                                 error = kvp_process_ip_address(
997                                                              curp->ifa_netmask,
998                                                              AF_INET,
999                                                              (char *)
1000                                                              ip_buffer->sub_net,
1001                                                              length,
1002                                                              &sn_offset);
1003                                 if (error)
1004                                         goto gather_ipaddr;
1005                         } else {
1006                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1007 
1008                                 /*
1009                                  * Get subnet info in CIDR format.
1010                                  */
1011                                 weight = 0;
1012                                 sn_str = (char *)ip_buffer->sub_net;
1013                                 addr6 = (struct sockaddr_in6 *)
1014                                         curp->ifa_netmask;
1015                                 w = addr6->sin6_addr.s6_addr32;
1016 
1017                                 for (i = 0; i < 4; i++)
1018                                         weight += hweight32(&w[i]);
1019 
1020                                 sprintf(cidr_mask, "/%d", weight);
1021                                 if ((length - sn_offset) <
1022                                         (strlen(cidr_mask) + 1))
1023                                         goto gather_ipaddr;
1024 
1025                                 if (sn_offset == 0)
1026                                         strcpy(sn_str, cidr_mask);
1027                                 else {
1028                                         strcat((char *)ip_buffer->sub_net, ";");
1029                                         strcat(sn_str, cidr_mask);
1030                                 }
1031                                 sn_offset += strlen(sn_str) + 1;
1032                         }
1033 
1034                         /*
1035                          * Collect other ip related configuration info.
1036                          */
1037 
1038                         kvp_get_ipconfig_info(if_name, ip_buffer);
1039                 }
1040 
1041 gather_ipaddr:
1042                 error = kvp_process_ip_address(curp->ifa_addr,
1043                                                 curp->ifa_addr->sa_family,
1044                                                 buffer,
1045                                                 length, &offset);
1046                 if (error)
1047                         goto getaddr_done;
1048 
1049                 curp = curp->ifa_next;
1050         }
1051 
1052 getaddr_done:
1053         freeifaddrs(ifap);
1054         return error;
1055 }
1056 
1057 
1058 static int expand_ipv6(char *addr, int type)
1059 {
1060         int ret;
1061         struct in6_addr v6_addr;
1062 
1063         ret = inet_pton(AF_INET6, addr, &v6_addr);
1064 
1065         if (ret != 1) {
1066                 if (type == NETMASK)
1067                         return 1;
1068                 return 0;
1069         }
1070 
1071         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1072                 "%02x%02x:%02x%02x:%02x%02x",
1073                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1074                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1075                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1076                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1077                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1078                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1079                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1080                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1081 
1082         return 1;
1083 
1084 }
1085 
1086 static int is_ipv4(char *addr)
1087 {
1088         int ret;
1089         struct in_addr ipv4_addr;
1090 
1091         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1092 
1093         if (ret == 1)
1094                 return 1;
1095         return 0;
1096 }
1097 
1098 static int parse_ip_val_buffer(char *in_buf, int *offset,
1099                                 char *out_buf, int out_len)
1100 {
1101         char *x;
1102         char *start;
1103 
1104         /*
1105          * in_buf has sequence of characters that are seperated by
1106          * the character ';'. The last sequence does not have the
1107          * terminating ";" character.
1108          */
1109         start = in_buf + *offset;
1110 
1111         x = strchr(start, ';');
1112         if (x)
1113                 *x = 0;
1114         else
1115                 x = start + strlen(start);
1116 
1117         if (strlen(start) != 0) {
1118                 int i = 0;
1119                 /*
1120                  * Get rid of leading spaces.
1121                  */
1122                 while (start[i] == ' ')
1123                         i++;
1124 
1125                 if ((x - start) <= out_len) {
1126                         strcpy(out_buf, (start + i));
1127                         *offset += (x - start) + 1;
1128                         return 1;
1129                 }
1130         }
1131         return 0;
1132 }
1133 
1134 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1135 {
1136         int ret;
1137 
1138         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1139 
1140         if (ret < 0)
1141                 return HV_E_FAIL;
1142 
1143         return 0;
1144 }
1145 
1146 
1147 static int process_ip_string(FILE *f, char *ip_string, int type)
1148 {
1149         int error = 0;
1150         char addr[INET6_ADDRSTRLEN];
1151         int i = 0;
1152         int j = 0;
1153         char str[256];
1154         char sub_str[10];
1155         int offset = 0;
1156 
1157         memset(addr, 0, sizeof(addr));
1158 
1159         while (parse_ip_val_buffer(ip_string, &offset, addr,
1160                                         (MAX_IP_ADDR_SIZE * 2))) {
1161 
1162                 sub_str[0] = 0;
1163                 if (is_ipv4(addr)) {
1164                         switch (type) {
1165                         case IPADDR:
1166                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1167                                 break;
1168                         case NETMASK:
1169                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1170                                 break;
1171                         case GATEWAY:
1172                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1173                                 break;
1174                         case DNS:
1175                                 snprintf(str, sizeof(str), "%s", "DNS");
1176                                 break;
1177                         }
1178 
1179                         if (type == DNS) {
1180                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1181                         } else if (type == GATEWAY && i == 0) {
1182                                 ++i;
1183                         } else {
1184                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1185                         }
1186 
1187 
1188                 } else if (expand_ipv6(addr, type)) {
1189                         switch (type) {
1190                         case IPADDR:
1191                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1192                                 break;
1193                         case NETMASK:
1194                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1195                                 break;
1196                         case GATEWAY:
1197                                 snprintf(str, sizeof(str), "%s",
1198                                         "IPV6_DEFAULTGW");
1199                                 break;
1200                         case DNS:
1201                                 snprintf(str, sizeof(str), "%s",  "DNS");
1202                                 break;
1203                         }
1204 
1205                         if (type == DNS) {
1206                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1207                         } else if (j == 0) {
1208                                 ++j;
1209                         } else {
1210                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1211                         }
1212                 } else {
1213                         return  HV_INVALIDARG;
1214                 }
1215 
1216                 error = kvp_write_file(f, str, sub_str, addr);
1217                 if (error)
1218                         return error;
1219                 memset(addr, 0, sizeof(addr));
1220         }
1221 
1222         return 0;
1223 }
1224 
1225 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1226 {
1227         int error = 0;
1228         char if_file[128];
1229         FILE *file;
1230         char cmd[512];
1231         char *mac_addr;
1232 
1233         /*
1234          * Set the configuration for the specified interface with
1235          * the information provided. Since there is no standard
1236          * way to configure an interface, we will have an external
1237          * script that does the job of configuring the interface and
1238          * flushing the configuration.
1239          *
1240          * The parameters passed to this external script are:
1241          * 1. A configuration file that has the specified configuration.
1242          *
1243          * We will embed the name of the interface in the configuration
1244          * file: ifcfg-ethx (where ethx is the interface name).
1245          *
1246          * The information provided here may be more than what is needed
1247          * in a given distro to configure the interface and so are free
1248          * ignore information that may not be relevant.
1249          *
1250          * Here is the format of the ip configuration file:
1251          *
1252          * HWADDR=macaddr
1253          * DEVICE=interface name
1254          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1255          *                       or "none" if no boot-time protocol should be used)
1256          *
1257          * IPADDR0=ipaddr1
1258          * IPADDR1=ipaddr2
1259          * IPADDRx=ipaddry (where y = x + 1)
1260          *
1261          * NETMASK0=netmask1
1262          * NETMASKx=netmasky (where y = x + 1)
1263          *
1264          * GATEWAY=ipaddr1
1265          * GATEWAYx=ipaddry (where y = x + 1)
1266          *
1267          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1268          *
1269          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1270          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1271          * IPV6NETMASK.
1272          *
1273          * The host can specify multiple ipv4 and ipv6 addresses to be
1274          * configured for the interface. Furthermore, the configuration
1275          * needs to be persistent. A subsequent GET call on the interface
1276          * is expected to return the configuration that is set via the SET
1277          * call.
1278          */
1279 
1280         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1281                 "/ifcfg-", if_name);
1282 
1283         file = fopen(if_file, "w");
1284 
1285         if (file == NULL) {
1286                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1287                                 errno, strerror(errno));
1288                 return HV_E_FAIL;
1289         }
1290 
1291         /*
1292          * First write out the MAC address.
1293          */
1294 
1295         mac_addr = kvp_if_name_to_mac(if_name);
1296         if (mac_addr == NULL) {
1297                 error = HV_E_FAIL;
1298                 goto setval_error;
1299         }
1300 
1301         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1302         free(mac_addr);
1303         if (error)
1304                 goto setval_error;
1305 
1306         error = kvp_write_file(file, "DEVICE", "", if_name);
1307         if (error)
1308                 goto setval_error;
1309 
1310         if (new_val->dhcp_enabled) {
1311                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1312                 if (error)
1313                         goto setval_error;
1314 
1315                 /*
1316                  * We are done!.
1317                  */
1318                 goto setval_done;
1319 
1320         } else {
1321                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1322                 if (error)
1323                         goto setval_error;
1324         }
1325 
1326         /*
1327          * Write the configuration for ipaddress, netmask, gateway and
1328          * name servers.
1329          */
1330 
1331         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1332         if (error)
1333                 goto setval_error;
1334 
1335         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1336         if (error)
1337                 goto setval_error;
1338 
1339         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1340         if (error)
1341                 goto setval_error;
1342 
1343         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1344         if (error)
1345                 goto setval_error;
1346 
1347 setval_done:
1348         fclose(file);
1349 
1350         /*
1351          * Now that we have populated the configuration file,
1352          * invoke the external script to do its magic.
1353          */
1354 
1355         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1356         if (system(cmd)) {
1357                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1358                                 cmd, errno, strerror(errno));
1359                 return HV_E_FAIL;
1360         }
1361         return 0;
1362 
1363 setval_error:
1364         syslog(LOG_ERR, "Failed to write config file");
1365         fclose(file);
1366         return error;
1367 }
1368 
1369 
1370 static int
1371 kvp_get_domain_name(char *buffer, int length)
1372 {
1373         struct addrinfo hints, *info ;
1374         int error = 0;
1375 
1376         gethostname(buffer, length);
1377         memset(&hints, 0, sizeof(hints));
1378         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1379         hints.ai_socktype = SOCK_STREAM;
1380         hints.ai_flags = AI_CANONNAME;
1381 
1382         error = getaddrinfo(buffer, NULL, &hints, &info);
1383         if (error != 0) {
1384                 strcpy(buffer, "getaddrinfo failed\n");
1385                 return error;
1386         }
1387         strcpy(buffer, info->ai_canonname);
1388         freeaddrinfo(info);
1389         return error;
1390 }
1391 
1392 static int
1393 netlink_send(int fd, struct cn_msg *msg)
1394 {
1395         struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
1396         unsigned int size;
1397         struct msghdr message;
1398         struct iovec iov[2];
1399 
1400         size = sizeof(struct cn_msg) + msg->len;
1401 
1402         nlh.nlmsg_pid = getpid();
1403         nlh.nlmsg_len = NLMSG_LENGTH(size);
1404 
1405         iov[0].iov_base = &nlh;
1406         iov[0].iov_len = sizeof(nlh);
1407 
1408         iov[1].iov_base = msg;
1409         iov[1].iov_len = size;
1410 
1411         memset(&message, 0, sizeof(message));
1412         message.msg_name = &addr;
1413         message.msg_namelen = sizeof(addr);
1414         message.msg_iov = iov;
1415         message.msg_iovlen = 2;
1416 
1417         return sendmsg(fd, &message, 0);
1418 }
1419 
1420 int main(void)
1421 {
1422         int fd, len, nl_group;
1423         int error;
1424         struct cn_msg *message;
1425         struct pollfd pfd;
1426         struct nlmsghdr *incoming_msg;
1427         struct cn_msg   *incoming_cn_msg;
1428         struct hv_kvp_msg *hv_msg;
1429         char    *p;
1430         char    *key_value;
1431         char    *key_name;
1432         int     op;
1433         int     pool;
1434         char    *if_name;
1435         struct hv_kvp_ipaddr_value *kvp_ip_val;
1436         char *kvp_send_buffer;
1437         char *kvp_recv_buffer;
1438         size_t kvp_recv_buffer_len;
1439 
1440         if (daemon(1, 0))
1441                 return 1;
1442         openlog("KVP", 0, LOG_USER);
1443         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1444 
1445         kvp_recv_buffer_len = NLMSG_HDRLEN + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
1446         kvp_send_buffer = calloc(1, kvp_recv_buffer_len);
1447         kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
1448         if (!(kvp_send_buffer && kvp_recv_buffer)) {
1449                 syslog(LOG_ERR, "Failed to allocate netlink buffers");
1450                 exit(EXIT_FAILURE);
1451         }
1452         /*
1453          * Retrieve OS release information.
1454          */
1455         kvp_get_os_info();
1456 
1457         if (kvp_file_init()) {
1458                 syslog(LOG_ERR, "Failed to initialize the pools");
1459                 exit(EXIT_FAILURE);
1460         }
1461 
1462         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1463         if (fd < 0) {
1464                 syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
1465                                 strerror(errno));
1466                 exit(EXIT_FAILURE);
1467         }
1468         addr.nl_family = AF_NETLINK;
1469         addr.nl_pad = 0;
1470         addr.nl_pid = 0;
1471         addr.nl_groups = 0;
1472 
1473 
1474         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1475         if (error < 0) {
1476                 syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
1477                 close(fd);
1478                 exit(EXIT_FAILURE);
1479         }
1480         nl_group = CN_KVP_IDX;
1481 
1482         if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
1483                 syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
1484                 close(fd);
1485                 exit(EXIT_FAILURE);
1486         }
1487 
1488         /*
1489          * Register ourselves with the kernel.
1490          */
1491         message = (struct cn_msg *)kvp_send_buffer;
1492         message->id.idx = CN_KVP_IDX;
1493         message->id.val = CN_KVP_VAL;
1494 
1495         hv_msg = (struct hv_kvp_msg *)message->data;
1496         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1497         message->ack = 0;
1498         message->len = sizeof(struct hv_kvp_msg);
1499 
1500         len = netlink_send(fd, message);
1501         if (len < 0) {
1502                 syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
1503                 close(fd);
1504                 exit(EXIT_FAILURE);
1505         }
1506 
1507         pfd.fd = fd;
1508 
1509         while (1) {
1510                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1511                 socklen_t addr_l = sizeof(addr);
1512                 pfd.events = POLLIN;
1513                 pfd.revents = 0;
1514 
1515                 if (poll(&pfd, 1, -1) < 0) {
1516                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1517                         if (errno == EINVAL) {
1518                                 close(fd);
1519                                 exit(EXIT_FAILURE);
1520                         }
1521                         else
1522                                 continue;
1523                 }
1524 
1525                 len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
1526                                 addr_p, &addr_l);
1527 
1528                 if (len < 0) {
1529                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1530                                         addr.nl_pid, errno, strerror(errno));
1531                         close(fd);
1532                         return -1;
1533                 }
1534 
1535                 if (addr.nl_pid) {
1536                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1537                                         addr.nl_pid);
1538                         continue;
1539                 }
1540 
1541                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1542 
1543                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1544                         continue;
1545 
1546                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1547                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1548 
1549                 /*
1550                  * We will use the KVP header information to pass back
1551                  * the error from this daemon. So, first copy the state
1552                  * and set the error code to success.
1553                  */
1554                 op = hv_msg->kvp_hdr.operation;
1555                 pool = hv_msg->kvp_hdr.pool;
1556                 hv_msg->error = HV_S_OK;
1557 
1558                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1559                         /*
1560                          * Driver is registering with us; stash away the version
1561                          * information.
1562                          */
1563                         in_hand_shake = 0;
1564                         p = (char *)hv_msg->body.kvp_register.version;
1565                         lic_version = malloc(strlen(p) + 1);
1566                         if (lic_version) {
1567                                 strcpy(lic_version, p);
1568                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1569                                         lic_version);
1570                         } else {
1571                                 syslog(LOG_ERR, "malloc failed");
1572                         }
1573                         continue;
1574                 }
1575 
1576                 switch (op) {
1577                 case KVP_OP_GET_IP_INFO:
1578                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1579                         if_name =
1580                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1581 
1582                         if (if_name == NULL) {
1583                                 /*
1584                                  * We could not map the mac address to an
1585                                  * interface name; return error.
1586                                  */
1587                                 hv_msg->error = HV_E_FAIL;
1588                                 break;
1589                         }
1590                         error = kvp_get_ip_info(
1591                                                 0, if_name, KVP_OP_GET_IP_INFO,
1592                                                 kvp_ip_val,
1593                                                 (MAX_IP_ADDR_SIZE * 2));
1594 
1595                         if (error)
1596                                 hv_msg->error = error;
1597 
1598                         free(if_name);
1599                         break;
1600 
1601                 case KVP_OP_SET_IP_INFO:
1602                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1603                         if_name = kvp_get_if_name(
1604                                         (char *)kvp_ip_val->adapter_id);
1605                         if (if_name == NULL) {
1606                                 /*
1607                                  * We could not map the guid to an
1608                                  * interface name; return error.
1609                                  */
1610                                 hv_msg->error = HV_GUID_NOTFOUND;
1611                                 break;
1612                         }
1613                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1614                         if (error)
1615                                 hv_msg->error = error;
1616 
1617                         free(if_name);
1618                         break;
1619 
1620                 case KVP_OP_SET:
1621                         if (kvp_key_add_or_modify(pool,
1622                                         hv_msg->body.kvp_set.data.key,
1623                                         hv_msg->body.kvp_set.data.key_size,
1624                                         hv_msg->body.kvp_set.data.value,
1625                                         hv_msg->body.kvp_set.data.value_size))
1626                                         hv_msg->error = HV_S_CONT;
1627                         break;
1628 
1629                 case KVP_OP_GET:
1630                         if (kvp_get_value(pool,
1631                                         hv_msg->body.kvp_set.data.key,
1632                                         hv_msg->body.kvp_set.data.key_size,
1633                                         hv_msg->body.kvp_set.data.value,
1634                                         hv_msg->body.kvp_set.data.value_size))
1635                                         hv_msg->error = HV_S_CONT;
1636                         break;
1637 
1638                 case KVP_OP_DELETE:
1639                         if (kvp_key_delete(pool,
1640                                         hv_msg->body.kvp_delete.key,
1641                                         hv_msg->body.kvp_delete.key_size))
1642                                         hv_msg->error = HV_S_CONT;
1643                         break;
1644 
1645                 default:
1646                         break;
1647                 }
1648 
1649                 if (op != KVP_OP_ENUMERATE)
1650                         goto kvp_done;
1651 
1652                 /*
1653                  * If the pool is KVP_POOL_AUTO, dynamically generate
1654                  * both the key and the value; if not read from the
1655                  * appropriate pool.
1656                  */
1657                 if (pool != KVP_POOL_AUTO) {
1658                         if (kvp_pool_enumerate(pool,
1659                                         hv_msg->body.kvp_enum_data.index,
1660                                         hv_msg->body.kvp_enum_data.data.key,
1661                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1662                                         hv_msg->body.kvp_enum_data.data.value,
1663                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1664                                         hv_msg->error = HV_S_CONT;
1665                         goto kvp_done;
1666                 }
1667 
1668                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1669                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1670                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1671 
1672                 switch (hv_msg->body.kvp_enum_data.index) {
1673                 case FullyQualifiedDomainName:
1674                         kvp_get_domain_name(key_value,
1675                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1676                         strcpy(key_name, "FullyQualifiedDomainName");
1677                         break;
1678                 case IntegrationServicesVersion:
1679                         strcpy(key_name, "IntegrationServicesVersion");
1680                         strcpy(key_value, lic_version);
1681                         break;
1682                 case NetworkAddressIPv4:
1683                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1684                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1685                         strcpy(key_name, "NetworkAddressIPv4");
1686                         break;
1687                 case NetworkAddressIPv6:
1688                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1689                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1690                         strcpy(key_name, "NetworkAddressIPv6");
1691                         break;
1692                 case OSBuildNumber:
1693                         strcpy(key_value, os_build);
1694                         strcpy(key_name, "OSBuildNumber");
1695                         break;
1696                 case OSName:
1697                         strcpy(key_value, os_name);
1698                         strcpy(key_name, "OSName");
1699                         break;
1700                 case OSMajorVersion:
1701                         strcpy(key_value, os_major);
1702                         strcpy(key_name, "OSMajorVersion");
1703                         break;
1704                 case OSMinorVersion:
1705                         strcpy(key_value, os_minor);
1706                         strcpy(key_name, "OSMinorVersion");
1707                         break;
1708                 case OSVersion:
1709                         strcpy(key_value, os_version);
1710                         strcpy(key_name, "OSVersion");
1711                         break;
1712                 case ProcessorArchitecture:
1713                         strcpy(key_value, processor_arch);
1714                         strcpy(key_name, "ProcessorArchitecture");
1715                         break;
1716                 default:
1717                         hv_msg->error = HV_S_CONT;
1718                         break;
1719                 }
1720                 /*
1721                  * Send the value back to the kernel. The response is
1722                  * already in the receive buffer. Update the cn_msg header to
1723                  * reflect the key value that has been added to the message
1724                  */
1725 kvp_done:
1726 
1727                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1728                 incoming_cn_msg->id.val = CN_KVP_VAL;
1729                 incoming_cn_msg->ack = 0;
1730                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1731 
1732                 len = netlink_send(fd, incoming_cn_msg);
1733                 if (len < 0) {
1734                         syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
1735                                         strerror(errno));
1736                         exit(EXIT_FAILURE);
1737                 }
1738         }
1739 
1740 }
1741 

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