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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/connector.h>
 37 #include <linux/hyperv.h>
 38 #include <linux/netlink.h>
 39 #include <ifaddrs.h>
 40 #include <netdb.h>
 41 #include <syslog.h>
 42 #include <sys/stat.h>
 43 #include <fcntl.h>
 44 #include <dirent.h>
 45 #include <net/if.h>
 46 #include <getopt.h>
 47 
 48 /*
 49  * KVP protocol: The user mode component first registers with the
 50  * the kernel component. Subsequently, the kernel component requests, data
 51  * for the specified keys. In response to this message the user mode component
 52  * fills in the value corresponding to the specified key. We overload the
 53  * sequence field in the cn_msg header to define our KVP message types.
 54  *
 55  * We use this infrastructure for also supporting queries from user mode
 56  * application for state that may be maintained in the KVP kernel component.
 57  *
 58  */
 59 
 60 
 61 enum key_index {
 62         FullyQualifiedDomainName = 0,
 63         IntegrationServicesVersion, /*This key is serviced in the kernel*/
 64         NetworkAddressIPv4,
 65         NetworkAddressIPv6,
 66         OSBuildNumber,
 67         OSName,
 68         OSMajorVersion,
 69         OSMinorVersion,
 70         OSVersion,
 71         ProcessorArchitecture
 72 };
 73 
 74 
 75 enum {
 76         IPADDR = 0,
 77         NETMASK,
 78         GATEWAY,
 79         DNS
 80 };
 81 
 82 static struct sockaddr_nl addr;
 83 static int in_hand_shake = 1;
 84 
 85 static char *os_name = "";
 86 static char *os_major = "";
 87 static char *os_minor = "";
 88 static char *processor_arch;
 89 static char *os_build;
 90 static char *os_version;
 91 static char *lic_version = "Unknown version";
 92 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 93 static struct utsname uts_buf;
 94 
 95 /*
 96  * The location of the interface configuration file.
 97  */
 98 
 99 #define KVP_CONFIG_LOC  "/var/lib/hyperv"
100 
101 #define MAX_FILE_NAME 100
102 #define ENTRIES_PER_BLOCK 50
103 
104 #ifndef SOL_NETLINK
105 #define SOL_NETLINK 270
106 #endif
107 
108 struct kvp_record {
109         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
110         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
111 };
112 
113 struct kvp_file_state {
114         int fd;
115         int num_blocks;
116         struct kvp_record *records;
117         int num_records;
118         char fname[MAX_FILE_NAME];
119 };
120 
121 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
122 
123 static void kvp_acquire_lock(int pool)
124 {
125         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
126         fl.l_pid = getpid();
127 
128         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
129                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
130                                 errno, strerror(errno));
131                 exit(EXIT_FAILURE);
132         }
133 }
134 
135 static void kvp_release_lock(int pool)
136 {
137         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
138         fl.l_pid = getpid();
139 
140         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
141                 syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
142                                 errno, strerror(errno));
143                 exit(EXIT_FAILURE);
144         }
145 }
146 
147 static void kvp_update_file(int pool)
148 {
149         FILE *filep;
150 
151         /*
152          * We are going to write our in-memory registry out to
153          * disk; acquire the lock first.
154          */
155         kvp_acquire_lock(pool);
156 
157         filep = fopen(kvp_file_info[pool].fname, "we");
158         if (!filep) {
159                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
160                                 errno, strerror(errno));
161                 kvp_release_lock(pool);
162                 exit(EXIT_FAILURE);
163         }
164 
165         fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
166                                 kvp_file_info[pool].num_records, filep);
167 
168         if (ferror(filep) || fclose(filep)) {
169                 kvp_release_lock(pool);
170                 syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
171                 exit(EXIT_FAILURE);
172         }
173 
174         kvp_release_lock(pool);
175 }
176 
177 static void kvp_update_mem_state(int pool)
178 {
179         FILE *filep;
180         size_t records_read = 0;
181         struct kvp_record *record = kvp_file_info[pool].records;
182         struct kvp_record *readp;
183         int num_blocks = kvp_file_info[pool].num_blocks;
184         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
185 
186         kvp_acquire_lock(pool);
187 
188         filep = fopen(kvp_file_info[pool].fname, "re");
189         if (!filep) {
190                 syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
191                                 errno, strerror(errno));
192                 kvp_release_lock(pool);
193                 exit(EXIT_FAILURE);
194         }
195         for (;;) {
196                 readp = &record[records_read];
197                 records_read += fread(readp, sizeof(struct kvp_record),
198                                         ENTRIES_PER_BLOCK * num_blocks,
199                                         filep);
200 
201                 if (ferror(filep)) {
202                         syslog(LOG_ERR, "Failed to read file, pool: %d", pool);
203                         exit(EXIT_FAILURE);
204                 }
205 
206                 if (!feof(filep)) {
207                         /*
208                          * We have more data to read.
209                          */
210                         num_blocks++;
211                         record = realloc(record, alloc_unit * num_blocks);
212 
213                         if (record == NULL) {
214                                 syslog(LOG_ERR, "malloc failed");
215                                 exit(EXIT_FAILURE);
216                         }
217                         continue;
218                 }
219                 break;
220         }
221 
222         kvp_file_info[pool].num_blocks = num_blocks;
223         kvp_file_info[pool].records = record;
224         kvp_file_info[pool].num_records = records_read;
225 
226         fclose(filep);
227         kvp_release_lock(pool);
228 }
229 static int kvp_file_init(void)
230 {
231         int  fd;
232         FILE *filep;
233         size_t records_read;
234         char *fname;
235         struct kvp_record *record;
236         struct kvp_record *readp;
237         int num_blocks;
238         int i;
239         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
240 
241         if (access(KVP_CONFIG_LOC, F_OK)) {
242                 if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
243                         syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
244                                         errno, strerror(errno));
245                         exit(EXIT_FAILURE);
246                 }
247         }
248 
249         for (i = 0; i < KVP_POOL_COUNT; i++) {
250                 fname = kvp_file_info[i].fname;
251                 records_read = 0;
252                 num_blocks = 1;
253                 sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
254                 fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
255 
256                 if (fd == -1)
257                         return 1;
258 
259 
260                 filep = fopen(fname, "re");
261                 if (!filep) {
262                         close(fd);
263                         return 1;
264                 }
265 
266                 record = malloc(alloc_unit * num_blocks);
267                 if (record == NULL) {
268                         fclose(filep);
269                         close(fd);
270                         return 1;
271                 }
272                 for (;;) {
273                         readp = &record[records_read];
274                         records_read += fread(readp, sizeof(struct kvp_record),
275                                         ENTRIES_PER_BLOCK,
276                                         filep);
277 
278                         if (ferror(filep)) {
279                                 syslog(LOG_ERR, "Failed to read file, pool: %d",
280                                        i);
281                                 exit(EXIT_FAILURE);
282                         }
283 
284                         if (!feof(filep)) {
285                                 /*
286                                  * We have more data to read.
287                                  */
288                                 num_blocks++;
289                                 record = realloc(record, alloc_unit *
290                                                 num_blocks);
291                                 if (record == NULL) {
292                                         fclose(filep);
293                                         close(fd);
294                                         return 1;
295                                 }
296                                 continue;
297                         }
298                         break;
299                 }
300                 kvp_file_info[i].fd = fd;
301                 kvp_file_info[i].num_blocks = num_blocks;
302                 kvp_file_info[i].records = record;
303                 kvp_file_info[i].num_records = records_read;
304                 fclose(filep);
305 
306         }
307 
308         return 0;
309 }
310 
311 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
312 {
313         int i;
314         int j, k;
315         int num_records;
316         struct kvp_record *record;
317 
318         /*
319          * First update the in-memory state.
320          */
321         kvp_update_mem_state(pool);
322 
323         num_records = kvp_file_info[pool].num_records;
324         record = kvp_file_info[pool].records;
325 
326         for (i = 0; i < num_records; i++) {
327                 if (memcmp(key, record[i].key, key_size))
328                         continue;
329                 /*
330                  * Found a match; just move the remaining
331                  * entries up.
332                  */
333                 if (i == num_records) {
334                         kvp_file_info[pool].num_records--;
335                         kvp_update_file(pool);
336                         return 0;
337                 }
338 
339                 j = i;
340                 k = j + 1;
341                 for (; k < num_records; k++) {
342                         strcpy(record[j].key, record[k].key);
343                         strcpy(record[j].value, record[k].value);
344                         j++;
345                 }
346 
347                 kvp_file_info[pool].num_records--;
348                 kvp_update_file(pool);
349                 return 0;
350         }
351         return 1;
352 }
353 
354 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
355                                  const __u8 *value, int value_size)
356 {
357         int i;
358         int num_records;
359         struct kvp_record *record;
360         int num_blocks;
361 
362         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
363                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
364                 return 1;
365 
366         /*
367          * First update the in-memory state.
368          */
369         kvp_update_mem_state(pool);
370 
371         num_records = kvp_file_info[pool].num_records;
372         record = kvp_file_info[pool].records;
373         num_blocks = kvp_file_info[pool].num_blocks;
374 
375         for (i = 0; i < num_records; i++) {
376                 if (memcmp(key, record[i].key, key_size))
377                         continue;
378                 /*
379                  * Found a match; just update the value -
380                  * this is the modify case.
381                  */
382                 memcpy(record[i].value, value, value_size);
383                 kvp_update_file(pool);
384                 return 0;
385         }
386 
387         /*
388          * Need to add a new entry;
389          */
390         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
391                 /* Need to allocate a larger array for reg entries. */
392                 record = realloc(record, sizeof(struct kvp_record) *
393                          ENTRIES_PER_BLOCK * (num_blocks + 1));
394 
395                 if (record == NULL)
396                         return 1;
397                 kvp_file_info[pool].num_blocks++;
398 
399         }
400         memcpy(record[i].value, value, value_size);
401         memcpy(record[i].key, key, key_size);
402         kvp_file_info[pool].records = record;
403         kvp_file_info[pool].num_records++;
404         kvp_update_file(pool);
405         return 0;
406 }
407 
408 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
409                         int value_size)
410 {
411         int i;
412         int num_records;
413         struct kvp_record *record;
414 
415         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
416                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
417                 return 1;
418 
419         /*
420          * First update the in-memory state.
421          */
422         kvp_update_mem_state(pool);
423 
424         num_records = kvp_file_info[pool].num_records;
425         record = kvp_file_info[pool].records;
426 
427         for (i = 0; i < num_records; i++) {
428                 if (memcmp(key, record[i].key, key_size))
429                         continue;
430                 /*
431                  * Found a match; just copy the value out.
432                  */
433                 memcpy(value, record[i].value, value_size);
434                 return 0;
435         }
436 
437         return 1;
438 }
439 
440 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
441                                 __u8 *value, int value_size)
442 {
443         struct kvp_record *record;
444 
445         /*
446          * First update our in-memory database.
447          */
448         kvp_update_mem_state(pool);
449         record = kvp_file_info[pool].records;
450 
451         if (index >= kvp_file_info[pool].num_records) {
452                 return 1;
453         }
454 
455         memcpy(key, record[index].key, key_size);
456         memcpy(value, record[index].value, value_size);
457         return 0;
458 }
459 
460 
461 void kvp_get_os_info(void)
462 {
463         FILE    *file;
464         char    *p, buf[512];
465 
466         uname(&uts_buf);
467         os_version = uts_buf.release;
468         os_build = strdup(uts_buf.release);
469 
470         os_name = uts_buf.sysname;
471         processor_arch = uts_buf.machine;
472 
473         /*
474          * The current windows host (win7) expects the build
475          * string to be of the form: x.y.z
476          * Strip additional information we may have.
477          */
478         p = strchr(os_version, '-');
479         if (p)
480                 *p = '\0';
481 
482         /*
483          * Parse the /etc/os-release file if present:
484          * http://www.freedesktop.org/software/systemd/man/os-release.html
485          */
486         file = fopen("/etc/os-release", "r");
487         if (file != NULL) {
488                 while (fgets(buf, sizeof(buf), file)) {
489                         char *value, *q;
490 
491                         /* Ignore comments */
492                         if (buf[0] == '#')
493                                 continue;
494 
495                         /* Split into name=value */
496                         p = strchr(buf, '=');
497                         if (!p)
498                                 continue;
499                         *p++ = 0;
500 
501                         /* Remove quotes and newline; un-escape */
502                         value = p;
503                         q = p;
504                         while (*p) {
505                                 if (*p == '\\') {
506                                         ++p;
507                                         if (!*p)
508                                                 break;
509                                         *q++ = *p++;
510                                 } else if (*p == '\'' || *p == '"' ||
511                                            *p == '\n') {
512                                         ++p;
513                                 } else {
514                                         *q++ = *p++;
515                                 }
516                         }
517                         *q = 0;
518 
519                         if (!strcmp(buf, "NAME")) {
520                                 p = strdup(value);
521                                 if (!p)
522                                         break;
523                                 os_name = p;
524                         } else if (!strcmp(buf, "VERSION_ID")) {
525                                 p = strdup(value);
526                                 if (!p)
527                                         break;
528                                 os_major = p;
529                         }
530                 }
531                 fclose(file);
532                 return;
533         }
534 
535         /* Fallback for older RH/SUSE releases */
536         file = fopen("/etc/SuSE-release", "r");
537         if (file != NULL)
538                 goto kvp_osinfo_found;
539         file  = fopen("/etc/redhat-release", "r");
540         if (file != NULL)
541                 goto kvp_osinfo_found;
542 
543         /*
544          * We don't have information about the os.
545          */
546         return;
547 
548 kvp_osinfo_found:
549         /* up to three lines */
550         p = fgets(buf, sizeof(buf), file);
551         if (p) {
552                 p = strchr(buf, '\n');
553                 if (p)
554                         *p = '\0';
555                 p = strdup(buf);
556                 if (!p)
557                         goto done;
558                 os_name = p;
559 
560                 /* second line */
561                 p = fgets(buf, sizeof(buf), file);
562                 if (p) {
563                         p = strchr(buf, '\n');
564                         if (p)
565                                 *p = '\0';
566                         p = strdup(buf);
567                         if (!p)
568                                 goto done;
569                         os_major = p;
570 
571                         /* third line */
572                         p = fgets(buf, sizeof(buf), file);
573                         if (p)  {
574                                 p = strchr(buf, '\n');
575                                 if (p)
576                                         *p = '\0';
577                                 p = strdup(buf);
578                                 if (p)
579                                         os_minor = p;
580                         }
581                 }
582         }
583 
584 done:
585         fclose(file);
586         return;
587 }
588 
589 
590 
591 /*
592  * Retrieve an interface name corresponding to the specified guid.
593  * If there is a match, the function returns a pointer
594  * to the interface name and if not, a NULL is returned.
595  * If a match is found, the caller is responsible for
596  * freeing the memory.
597  */
598 
599 static char *kvp_get_if_name(char *guid)
600 {
601         DIR *dir;
602         struct dirent *entry;
603         FILE    *file;
604         char    *p, *q, *x;
605         char    *if_name = NULL;
606         char    buf[256];
607         char *kvp_net_dir = "/sys/class/net/";
608         char dev_id[256];
609 
610         dir = opendir(kvp_net_dir);
611         if (dir == NULL)
612                 return NULL;
613 
614         snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
615         q = dev_id + strlen(kvp_net_dir);
616 
617         while ((entry = readdir(dir)) != NULL) {
618                 /*
619                  * Set the state for the next pass.
620                  */
621                 *q = '\0';
622                 strcat(dev_id, entry->d_name);
623                 strcat(dev_id, "/device/device_id");
624 
625                 file = fopen(dev_id, "r");
626                 if (file == NULL)
627                         continue;
628 
629                 p = fgets(buf, sizeof(buf), file);
630                 if (p) {
631                         x = strchr(p, '\n');
632                         if (x)
633                                 *x = '\0';
634 
635                         if (!strcmp(p, guid)) {
636                                 /*
637                                  * Found the guid match; return the interface
638                                  * name. The caller will free the memory.
639                                  */
640                                 if_name = strdup(entry->d_name);
641                                 fclose(file);
642                                 break;
643                         }
644                 }
645                 fclose(file);
646         }
647 
648         closedir(dir);
649         return if_name;
650 }
651 
652 /*
653  * Retrieve the MAC address given the interface name.
654  */
655 
656 static char *kvp_if_name_to_mac(char *if_name)
657 {
658         FILE    *file;
659         char    *p, *x;
660         char    buf[256];
661         char addr_file[256];
662         unsigned int i;
663         char *mac_addr = NULL;
664 
665         snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
666                 if_name, "/address");
667 
668         file = fopen(addr_file, "r");
669         if (file == NULL)
670                 return NULL;
671 
672         p = fgets(buf, sizeof(buf), file);
673         if (p) {
674                 x = strchr(p, '\n');
675                 if (x)
676                         *x = '\0';
677                 for (i = 0; i < strlen(p); i++)
678                         p[i] = toupper(p[i]);
679                 mac_addr = strdup(p);
680         }
681 
682         fclose(file);
683         return mac_addr;
684 }
685 
686 
687 /*
688  * Retrieve the interface name given tha MAC address.
689  */
690 
691 static char *kvp_mac_to_if_name(char *mac)
692 {
693         DIR *dir;
694         struct dirent *entry;
695         FILE    *file;
696         char    *p, *q, *x;
697         char    *if_name = NULL;
698         char    buf[256];
699         char *kvp_net_dir = "/sys/class/net/";
700         char dev_id[256];
701         unsigned int i;
702 
703         dir = opendir(kvp_net_dir);
704         if (dir == NULL)
705                 return NULL;
706 
707         snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
708         q = dev_id + strlen(kvp_net_dir);
709 
710         while ((entry = readdir(dir)) != NULL) {
711                 /*
712                  * Set the state for the next pass.
713                  */
714                 *q = '\0';
715 
716                 strcat(dev_id, entry->d_name);
717                 strcat(dev_id, "/address");
718 
719                 file = fopen(dev_id, "r");
720                 if (file == NULL)
721                         continue;
722 
723                 p = fgets(buf, sizeof(buf), file);
724                 if (p) {
725                         x = strchr(p, '\n');
726                         if (x)
727                                 *x = '\0';
728 
729                         for (i = 0; i < strlen(p); i++)
730                                 p[i] = toupper(p[i]);
731 
732                         if (!strcmp(p, mac)) {
733                                 /*
734                                  * Found the MAC match; return the interface
735                                  * name. The caller will free the memory.
736                                  */
737                                 if_name = strdup(entry->d_name);
738                                 fclose(file);
739                                 break;
740                         }
741                 }
742                 fclose(file);
743         }
744 
745         closedir(dir);
746         return if_name;
747 }
748 
749 
750 static void kvp_process_ipconfig_file(char *cmd,
751                                         char *config_buf, unsigned int len,
752                                         int element_size, int offset)
753 {
754         char buf[256];
755         char *p;
756         char *x;
757         FILE *file;
758 
759         /*
760          * First execute the command.
761          */
762         file = popen(cmd, "r");
763         if (file == NULL)
764                 return;
765 
766         if (offset == 0)
767                 memset(config_buf, 0, len);
768         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
769                 if (len < strlen(config_buf) + element_size + 1)
770                         break;
771 
772                 x = strchr(p, '\n');
773                 if (x)
774                         *x = '\0';
775 
776                 strcat(config_buf, p);
777                 strcat(config_buf, ";");
778         }
779         pclose(file);
780 }
781 
782 static void kvp_get_ipconfig_info(char *if_name,
783                                  struct hv_kvp_ipaddr_value *buffer)
784 {
785         char cmd[512];
786         char dhcp_info[128];
787         char *p;
788         FILE *file;
789 
790         /*
791          * Get the address of default gateway (ipv4).
792          */
793         sprintf(cmd, "%s %s", "ip route show dev", if_name);
794         strcat(cmd, " | awk '/default/ {print $3 }'");
795 
796         /*
797          * Execute the command to gather gateway info.
798          */
799         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
800                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
801 
802         /*
803          * Get the address of default gateway (ipv6).
804          */
805         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
806         strcat(cmd, " | awk '/default/ {print $3 }'");
807 
808         /*
809          * Execute the command to gather gateway info (ipv6).
810          */
811         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
812                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
813 
814 
815         /*
816          * Gather the DNS  state.
817          * Since there is no standard way to get this information
818          * across various distributions of interest; we just invoke
819          * an external script that needs to be ported across distros
820          * of interest.
821          *
822          * Following is the expected format of the information from the script:
823          *
824          * ipaddr1 (nameserver1)
825          * ipaddr2 (nameserver2)
826          * .
827          * .
828          */
829 
830         sprintf(cmd, "%s",  "hv_get_dns_info");
831 
832         /*
833          * Execute the command to gather DNS info.
834          */
835         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
836                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
837 
838         /*
839          * Gather the DHCP state.
840          * We will gather this state by invoking an external script.
841          * The parameter to the script is the interface name.
842          * Here is the expected output:
843          *
844          * Enabled: DHCP enabled.
845          */
846 
847         sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
848 
849         file = popen(cmd, "r");
850         if (file == NULL)
851                 return;
852 
853         p = fgets(dhcp_info, sizeof(dhcp_info), file);
854         if (p == NULL) {
855                 pclose(file);
856                 return;
857         }
858 
859         if (!strncmp(p, "Enabled", 7))
860                 buffer->dhcp_enabled = 1;
861         else
862                 buffer->dhcp_enabled = 0;
863 
864         pclose(file);
865 }
866 
867 
868 static unsigned int hweight32(unsigned int *w)
869 {
870         unsigned int res = *w - ((*w >> 1) & 0x55555555);
871         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
872         res = (res + (res >> 4)) & 0x0F0F0F0F;
873         res = res + (res >> 8);
874         return (res + (res >> 16)) & 0x000000FF;
875 }
876 
877 static int kvp_process_ip_address(void *addrp,
878                                 int family, char *buffer,
879                                 int length,  int *offset)
880 {
881         struct sockaddr_in *addr;
882         struct sockaddr_in6 *addr6;
883         int addr_length;
884         char tmp[50];
885         const char *str;
886 
887         if (family == AF_INET) {
888                 addr = (struct sockaddr_in *)addrp;
889                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
890                 addr_length = INET_ADDRSTRLEN;
891         } else {
892                 addr6 = (struct sockaddr_in6 *)addrp;
893                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
894                 addr_length = INET6_ADDRSTRLEN;
895         }
896 
897         if ((length - *offset) < addr_length + 2)
898                 return HV_E_FAIL;
899         if (str == NULL) {
900                 strcpy(buffer, "inet_ntop failed\n");
901                 return HV_E_FAIL;
902         }
903         if (*offset == 0)
904                 strcpy(buffer, tmp);
905         else {
906                 strcat(buffer, ";");
907                 strcat(buffer, tmp);
908         }
909 
910         *offset += strlen(str) + 1;
911 
912         return 0;
913 }
914 
915 static int
916 kvp_get_ip_info(int family, char *if_name, int op,
917                  void  *out_buffer, unsigned int length)
918 {
919         struct ifaddrs *ifap;
920         struct ifaddrs *curp;
921         int offset = 0;
922         int sn_offset = 0;
923         int error = 0;
924         char *buffer;
925         struct hv_kvp_ipaddr_value *ip_buffer;
926         char cidr_mask[5]; /* /xyz */
927         int weight;
928         int i;
929         unsigned int *w;
930         char *sn_str;
931         struct sockaddr_in6 *addr6;
932 
933         if (op == KVP_OP_ENUMERATE) {
934                 buffer = out_buffer;
935         } else {
936                 ip_buffer = out_buffer;
937                 buffer = (char *)ip_buffer->ip_addr;
938                 ip_buffer->addr_family = 0;
939         }
940         /*
941          * On entry into this function, the buffer is capable of holding the
942          * maximum key value.
943          */
944 
945         if (getifaddrs(&ifap)) {
946                 strcpy(buffer, "getifaddrs failed\n");
947                 return HV_E_FAIL;
948         }
949 
950         curp = ifap;
951         while (curp != NULL) {
952                 if (curp->ifa_addr == NULL) {
953                         curp = curp->ifa_next;
954                         continue;
955                 }
956 
957                 if ((if_name != NULL) &&
958                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
959                         /*
960                          * We want info about a specific interface;
961                          * just continue.
962                          */
963                         curp = curp->ifa_next;
964                         continue;
965                 }
966 
967                 /*
968                  * We only support two address families: AF_INET and AF_INET6.
969                  * If a family value of 0 is specified, we collect both
970                  * supported address families; if not we gather info on
971                  * the specified address family.
972                  */
973                 if ((((family != 0) &&
974                          (curp->ifa_addr->sa_family != family))) ||
975                          (curp->ifa_flags & IFF_LOOPBACK)) {
976                         curp = curp->ifa_next;
977                         continue;
978                 }
979                 if ((curp->ifa_addr->sa_family != AF_INET) &&
980                         (curp->ifa_addr->sa_family != AF_INET6)) {
981                         curp = curp->ifa_next;
982                         continue;
983                 }
984 
985                 if (op == KVP_OP_GET_IP_INFO) {
986                         /*
987                          * Gather info other than the IP address.
988                          * IP address info will be gathered later.
989                          */
990                         if (curp->ifa_addr->sa_family == AF_INET) {
991                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
992                                 /*
993                                  * Get subnet info.
994                                  */
995                                 error = kvp_process_ip_address(
996                                                              curp->ifa_netmask,
997                                                              AF_INET,
998                                                              (char *)
999                                                              ip_buffer->sub_net,
1000                                                              length,
1001                                                              &sn_offset);
1002                                 if (error)
1003                                         goto gather_ipaddr;
1004                         } else {
1005                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
1006 
1007                                 /*
1008                                  * Get subnet info in CIDR format.
1009                                  */
1010                                 weight = 0;
1011                                 sn_str = (char *)ip_buffer->sub_net;
1012                                 addr6 = (struct sockaddr_in6 *)
1013                                         curp->ifa_netmask;
1014                                 w = addr6->sin6_addr.s6_addr32;
1015 
1016                                 for (i = 0; i < 4; i++)
1017                                         weight += hweight32(&w[i]);
1018 
1019                                 sprintf(cidr_mask, "/%d", weight);
1020                                 if (length < sn_offset + strlen(cidr_mask) + 1)
1021                                         goto gather_ipaddr;
1022 
1023                                 if (sn_offset == 0)
1024                                         strcpy(sn_str, cidr_mask);
1025                                 else {
1026                                         strcat((char *)ip_buffer->sub_net, ";");
1027                                         strcat(sn_str, cidr_mask);
1028                                 }
1029                                 sn_offset += strlen(sn_str) + 1;
1030                         }
1031 
1032                         /*
1033                          * Collect other ip related configuration info.
1034                          */
1035 
1036                         kvp_get_ipconfig_info(if_name, ip_buffer);
1037                 }
1038 
1039 gather_ipaddr:
1040                 error = kvp_process_ip_address(curp->ifa_addr,
1041                                                 curp->ifa_addr->sa_family,
1042                                                 buffer,
1043                                                 length, &offset);
1044                 if (error)
1045                         goto getaddr_done;
1046 
1047                 curp = curp->ifa_next;
1048         }
1049 
1050 getaddr_done:
1051         freeifaddrs(ifap);
1052         return error;
1053 }
1054 
1055 
1056 static int expand_ipv6(char *addr, int type)
1057 {
1058         int ret;
1059         struct in6_addr v6_addr;
1060 
1061         ret = inet_pton(AF_INET6, addr, &v6_addr);
1062 
1063         if (ret != 1) {
1064                 if (type == NETMASK)
1065                         return 1;
1066                 return 0;
1067         }
1068 
1069         sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1070                 "%02x%02x:%02x%02x:%02x%02x",
1071                 (int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1072                 (int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1073                 (int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1074                 (int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1075                 (int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1076                 (int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1077                 (int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1078                 (int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1079 
1080         return 1;
1081 
1082 }
1083 
1084 static int is_ipv4(char *addr)
1085 {
1086         int ret;
1087         struct in_addr ipv4_addr;
1088 
1089         ret = inet_pton(AF_INET, addr, &ipv4_addr);
1090 
1091         if (ret == 1)
1092                 return 1;
1093         return 0;
1094 }
1095 
1096 static int parse_ip_val_buffer(char *in_buf, int *offset,
1097                                 char *out_buf, int out_len)
1098 {
1099         char *x;
1100         char *start;
1101 
1102         /*
1103          * in_buf has sequence of characters that are seperated by
1104          * the character ';'. The last sequence does not have the
1105          * terminating ";" character.
1106          */
1107         start = in_buf + *offset;
1108 
1109         x = strchr(start, ';');
1110         if (x)
1111                 *x = 0;
1112         else
1113                 x = start + strlen(start);
1114 
1115         if (strlen(start) != 0) {
1116                 int i = 0;
1117                 /*
1118                  * Get rid of leading spaces.
1119                  */
1120                 while (start[i] == ' ')
1121                         i++;
1122 
1123                 if ((x - start) <= out_len) {
1124                         strcpy(out_buf, (start + i));
1125                         *offset += (x - start) + 1;
1126                         return 1;
1127                 }
1128         }
1129         return 0;
1130 }
1131 
1132 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1133 {
1134         int ret;
1135 
1136         ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1137 
1138         if (ret < 0)
1139                 return HV_E_FAIL;
1140 
1141         return 0;
1142 }
1143 
1144 
1145 static int process_ip_string(FILE *f, char *ip_string, int type)
1146 {
1147         int error = 0;
1148         char addr[INET6_ADDRSTRLEN];
1149         int i = 0;
1150         int j = 0;
1151         char str[256];
1152         char sub_str[10];
1153         int offset = 0;
1154 
1155         memset(addr, 0, sizeof(addr));
1156 
1157         while (parse_ip_val_buffer(ip_string, &offset, addr,
1158                                         (MAX_IP_ADDR_SIZE * 2))) {
1159 
1160                 sub_str[0] = 0;
1161                 if (is_ipv4(addr)) {
1162                         switch (type) {
1163                         case IPADDR:
1164                                 snprintf(str, sizeof(str), "%s", "IPADDR");
1165                                 break;
1166                         case NETMASK:
1167                                 snprintf(str, sizeof(str), "%s", "NETMASK");
1168                                 break;
1169                         case GATEWAY:
1170                                 snprintf(str, sizeof(str), "%s", "GATEWAY");
1171                                 break;
1172                         case DNS:
1173                                 snprintf(str, sizeof(str), "%s", "DNS");
1174                                 break;
1175                         }
1176 
1177                         if (type == DNS) {
1178                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1179                         } else if (type == GATEWAY && i == 0) {
1180                                 ++i;
1181                         } else {
1182                                 snprintf(sub_str, sizeof(sub_str), "%d", i++);
1183                         }
1184 
1185 
1186                 } else if (expand_ipv6(addr, type)) {
1187                         switch (type) {
1188                         case IPADDR:
1189                                 snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1190                                 break;
1191                         case NETMASK:
1192                                 snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1193                                 break;
1194                         case GATEWAY:
1195                                 snprintf(str, sizeof(str), "%s",
1196                                         "IPV6_DEFAULTGW");
1197                                 break;
1198                         case DNS:
1199                                 snprintf(str, sizeof(str), "%s",  "DNS");
1200                                 break;
1201                         }
1202 
1203                         if (type == DNS) {
1204                                 snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1205                         } else if (j == 0) {
1206                                 ++j;
1207                         } else {
1208                                 snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1209                         }
1210                 } else {
1211                         return  HV_INVALIDARG;
1212                 }
1213 
1214                 error = kvp_write_file(f, str, sub_str, addr);
1215                 if (error)
1216                         return error;
1217                 memset(addr, 0, sizeof(addr));
1218         }
1219 
1220         return 0;
1221 }
1222 
1223 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1224 {
1225         int error = 0;
1226         char if_file[128];
1227         FILE *file;
1228         char cmd[512];
1229         char *mac_addr;
1230 
1231         /*
1232          * Set the configuration for the specified interface with
1233          * the information provided. Since there is no standard
1234          * way to configure an interface, we will have an external
1235          * script that does the job of configuring the interface and
1236          * flushing the configuration.
1237          *
1238          * The parameters passed to this external script are:
1239          * 1. A configuration file that has the specified configuration.
1240          *
1241          * We will embed the name of the interface in the configuration
1242          * file: ifcfg-ethx (where ethx is the interface name).
1243          *
1244          * The information provided here may be more than what is needed
1245          * in a given distro to configure the interface and so are free
1246          * ignore information that may not be relevant.
1247          *
1248          * Here is the format of the ip configuration file:
1249          *
1250          * HWADDR=macaddr
1251          * DEVICE=interface name
1252          * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1253          *                       or "none" if no boot-time protocol should be used)
1254          *
1255          * IPADDR0=ipaddr1
1256          * IPADDR1=ipaddr2
1257          * IPADDRx=ipaddry (where y = x + 1)
1258          *
1259          * NETMASK0=netmask1
1260          * NETMASKx=netmasky (where y = x + 1)
1261          *
1262          * GATEWAY=ipaddr1
1263          * GATEWAYx=ipaddry (where y = x + 1)
1264          *
1265          * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1266          *
1267          * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1268          * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1269          * IPV6NETMASK.
1270          *
1271          * The host can specify multiple ipv4 and ipv6 addresses to be
1272          * configured for the interface. Furthermore, the configuration
1273          * needs to be persistent. A subsequent GET call on the interface
1274          * is expected to return the configuration that is set via the SET
1275          * call.
1276          */
1277 
1278         snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
1279                 "/ifcfg-", if_name);
1280 
1281         file = fopen(if_file, "w");
1282 
1283         if (file == NULL) {
1284                 syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1285                                 errno, strerror(errno));
1286                 return HV_E_FAIL;
1287         }
1288 
1289         /*
1290          * First write out the MAC address.
1291          */
1292 
1293         mac_addr = kvp_if_name_to_mac(if_name);
1294         if (mac_addr == NULL) {
1295                 error = HV_E_FAIL;
1296                 goto setval_error;
1297         }
1298 
1299         error = kvp_write_file(file, "HWADDR", "", mac_addr);
1300         free(mac_addr);
1301         if (error)
1302                 goto setval_error;
1303 
1304         error = kvp_write_file(file, "DEVICE", "", if_name);
1305         if (error)
1306                 goto setval_error;
1307 
1308         /*
1309          * The dhcp_enabled flag is only for IPv4. In the case the host only
1310          * injects an IPv6 address, the flag is true, but we still need to
1311          * proceed to parse and pass the IPv6 information to the
1312          * disto-specific script hv_set_ifconfig.
1313          */
1314         if (new_val->dhcp_enabled) {
1315                 error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
1316                 if (error)
1317                         goto setval_error;
1318 
1319         } else {
1320                 error = kvp_write_file(file, "BOOTPROTO", "", "none");
1321                 if (error)
1322                         goto setval_error;
1323         }
1324 
1325         /*
1326          * Write the configuration for ipaddress, netmask, gateway and
1327          * name servers.
1328          */
1329 
1330         error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
1331         if (error)
1332                 goto setval_error;
1333 
1334         error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
1335         if (error)
1336                 goto setval_error;
1337 
1338         error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
1339         if (error)
1340                 goto setval_error;
1341 
1342         error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
1343         if (error)
1344                 goto setval_error;
1345 
1346         fclose(file);
1347 
1348         /*
1349          * Now that we have populated the configuration file,
1350          * invoke the external script to do its magic.
1351          */
1352 
1353         snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
1354         if (system(cmd)) {
1355                 syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1356                                 cmd, errno, strerror(errno));
1357                 return HV_E_FAIL;
1358         }
1359         return 0;
1360 
1361 setval_error:
1362         syslog(LOG_ERR, "Failed to write config file");
1363         fclose(file);
1364         return error;
1365 }
1366 
1367 
1368 static void
1369 kvp_get_domain_name(char *buffer, int length)
1370 {
1371         struct addrinfo hints, *info ;
1372         int error = 0;
1373 
1374         gethostname(buffer, length);
1375         memset(&hints, 0, sizeof(hints));
1376         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1377         hints.ai_socktype = SOCK_STREAM;
1378         hints.ai_flags = AI_CANONNAME;
1379 
1380         error = getaddrinfo(buffer, NULL, &hints, &info);
1381         if (error != 0) {
1382                 snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1383                         error, gai_strerror(error));
1384                 return;
1385         }
1386         snprintf(buffer, length, "%s", info->ai_canonname);
1387         freeaddrinfo(info);
1388 }
1389 
1390 static int
1391 netlink_send(int fd, struct cn_msg *msg)
1392 {
1393         struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
1394         unsigned int size;
1395         struct msghdr message;
1396         struct iovec iov[2];
1397 
1398         size = sizeof(struct cn_msg) + msg->len;
1399 
1400         nlh.nlmsg_pid = getpid();
1401         nlh.nlmsg_len = NLMSG_LENGTH(size);
1402 
1403         iov[0].iov_base = &nlh;
1404         iov[0].iov_len = sizeof(nlh);
1405 
1406         iov[1].iov_base = msg;
1407         iov[1].iov_len = size;
1408 
1409         memset(&message, 0, sizeof(message));
1410         message.msg_name = &addr;
1411         message.msg_namelen = sizeof(addr);
1412         message.msg_iov = iov;
1413         message.msg_iovlen = 2;
1414 
1415         return sendmsg(fd, &message, 0);
1416 }
1417 
1418 void print_usage(char *argv[])
1419 {
1420         fprintf(stderr, "Usage: %s [options]\n"
1421                 "Options are:\n"
1422                 "  -n, --no-daemon        stay in foreground, don't daemonize\n"
1423                 "  -h, --help             print this help\n", argv[0]);
1424 }
1425 
1426 int main(int argc, char *argv[])
1427 {
1428         int fd, len, nl_group;
1429         int error;
1430         struct cn_msg *message;
1431         struct pollfd pfd;
1432         struct nlmsghdr *incoming_msg;
1433         struct cn_msg   *incoming_cn_msg;
1434         struct hv_kvp_msg *hv_msg;
1435         char    *p;
1436         char    *key_value;
1437         char    *key_name;
1438         int     op;
1439         int     pool;
1440         char    *if_name;
1441         struct hv_kvp_ipaddr_value *kvp_ip_val;
1442         char *kvp_recv_buffer;
1443         size_t kvp_recv_buffer_len;
1444         int daemonize = 1, long_index = 0, opt;
1445 
1446         static struct option long_options[] = {
1447                 {"help",        no_argument,       0,  'h' },
1448                 {"no-daemon",   no_argument,       0,  'n' },
1449                 {0,             0,                 0,  0   }
1450         };
1451 
1452         while ((opt = getopt_long(argc, argv, "hn", long_options,
1453                                   &long_index)) != -1) {
1454                 switch (opt) {
1455                 case 'n':
1456                         daemonize = 0;
1457                         break;
1458                 case 'h':
1459                 default:
1460                         print_usage(argv);
1461                         exit(EXIT_FAILURE);
1462                 }
1463         }
1464 
1465         if (daemonize && daemon(1, 0))
1466                 return 1;
1467 
1468         openlog("KVP", 0, LOG_USER);
1469         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1470 
1471         kvp_recv_buffer_len = NLMSG_LENGTH(0) + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
1472         kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
1473         if (!kvp_recv_buffer) {
1474                 syslog(LOG_ERR, "Failed to allocate netlink buffer");
1475                 exit(EXIT_FAILURE);
1476         }
1477         /*
1478          * Retrieve OS release information.
1479          */
1480         kvp_get_os_info();
1481         /*
1482          * Cache Fully Qualified Domain Name because getaddrinfo takes an
1483          * unpredictable amount of time to finish.
1484          */
1485         kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1486 
1487         if (kvp_file_init()) {
1488                 syslog(LOG_ERR, "Failed to initialize the pools");
1489                 exit(EXIT_FAILURE);
1490         }
1491 
1492         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
1493         if (fd < 0) {
1494                 syslog(LOG_ERR, "netlink socket creation failed; error: %d %s", errno,
1495                                 strerror(errno));
1496                 exit(EXIT_FAILURE);
1497         }
1498         addr.nl_family = AF_NETLINK;
1499         addr.nl_pad = 0;
1500         addr.nl_pid = 0;
1501         addr.nl_groups = 0;
1502 
1503 
1504         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
1505         if (error < 0) {
1506                 syslog(LOG_ERR, "bind failed; error: %d %s", errno, strerror(errno));
1507                 close(fd);
1508                 exit(EXIT_FAILURE);
1509         }
1510         nl_group = CN_KVP_IDX;
1511 
1512         if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
1513                 syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
1514                 close(fd);
1515                 exit(EXIT_FAILURE);
1516         }
1517 
1518         /*
1519          * Register ourselves with the kernel.
1520          */
1521         message = (struct cn_msg *)kvp_recv_buffer;
1522         message->id.idx = CN_KVP_IDX;
1523         message->id.val = CN_KVP_VAL;
1524 
1525         hv_msg = (struct hv_kvp_msg *)message->data;
1526         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1527         message->ack = 0;
1528         message->len = sizeof(struct hv_kvp_msg);
1529 
1530         len = netlink_send(fd, message);
1531         if (len < 0) {
1532                 syslog(LOG_ERR, "netlink_send failed; error: %d %s", errno, strerror(errno));
1533                 close(fd);
1534                 exit(EXIT_FAILURE);
1535         }
1536 
1537         pfd.fd = fd;
1538 
1539         while (1) {
1540                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
1541                 socklen_t addr_l = sizeof(addr);
1542                 pfd.events = POLLIN;
1543                 pfd.revents = 0;
1544 
1545                 if (poll(&pfd, 1, -1) < 0) {
1546                         syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1547                         if (errno == EINVAL) {
1548                                 close(fd);
1549                                 exit(EXIT_FAILURE);
1550                         }
1551                         else
1552                                 continue;
1553                 }
1554 
1555                 len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
1556                                 addr_p, &addr_l);
1557 
1558                 if (len < 0) {
1559                         int saved_errno = errno;
1560                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
1561                                         addr.nl_pid, errno, strerror(errno));
1562 
1563                         if (saved_errno == ENOBUFS) {
1564                                 syslog(LOG_ERR, "receive error: ignored");
1565                                 continue;
1566                         }
1567 
1568                         close(fd);
1569                         return -1;
1570                 }
1571 
1572                 if (addr.nl_pid) {
1573                         syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
1574                                         addr.nl_pid);
1575                         continue;
1576                 }
1577 
1578                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
1579 
1580                 if (incoming_msg->nlmsg_type != NLMSG_DONE)
1581                         continue;
1582 
1583                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
1584                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1585 
1586                 /*
1587                  * We will use the KVP header information to pass back
1588                  * the error from this daemon. So, first copy the state
1589                  * and set the error code to success.
1590                  */
1591                 op = hv_msg->kvp_hdr.operation;
1592                 pool = hv_msg->kvp_hdr.pool;
1593                 hv_msg->error = HV_S_OK;
1594 
1595                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1596                         /*
1597                          * Driver is registering with us; stash away the version
1598                          * information.
1599                          */
1600                         in_hand_shake = 0;
1601                         p = (char *)hv_msg->body.kvp_register.version;
1602                         lic_version = malloc(strlen(p) + 1);
1603                         if (lic_version) {
1604                                 strcpy(lic_version, p);
1605                                 syslog(LOG_INFO, "KVP LIC Version: %s",
1606                                         lic_version);
1607                         } else {
1608                                 syslog(LOG_ERR, "malloc failed");
1609                         }
1610                         continue;
1611                 }
1612 
1613                 switch (op) {
1614                 case KVP_OP_GET_IP_INFO:
1615                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1616                         if_name =
1617                         kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
1618 
1619                         if (if_name == NULL) {
1620                                 /*
1621                                  * We could not map the mac address to an
1622                                  * interface name; return error.
1623                                  */
1624                                 hv_msg->error = HV_E_FAIL;
1625                                 break;
1626                         }
1627                         error = kvp_get_ip_info(
1628                                                 0, if_name, KVP_OP_GET_IP_INFO,
1629                                                 kvp_ip_val,
1630                                                 (MAX_IP_ADDR_SIZE * 2));
1631 
1632                         if (error)
1633                                 hv_msg->error = error;
1634 
1635                         free(if_name);
1636                         break;
1637 
1638                 case KVP_OP_SET_IP_INFO:
1639                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
1640                         if_name = kvp_get_if_name(
1641                                         (char *)kvp_ip_val->adapter_id);
1642                         if (if_name == NULL) {
1643                                 /*
1644                                  * We could not map the guid to an
1645                                  * interface name; return error.
1646                                  */
1647                                 hv_msg->error = HV_GUID_NOTFOUND;
1648                                 break;
1649                         }
1650                         error = kvp_set_ip_info(if_name, kvp_ip_val);
1651                         if (error)
1652                                 hv_msg->error = error;
1653 
1654                         free(if_name);
1655                         break;
1656 
1657                 case KVP_OP_SET:
1658                         if (kvp_key_add_or_modify(pool,
1659                                         hv_msg->body.kvp_set.data.key,
1660                                         hv_msg->body.kvp_set.data.key_size,
1661                                         hv_msg->body.kvp_set.data.value,
1662                                         hv_msg->body.kvp_set.data.value_size))
1663                                         hv_msg->error = HV_S_CONT;
1664                         break;
1665 
1666                 case KVP_OP_GET:
1667                         if (kvp_get_value(pool,
1668                                         hv_msg->body.kvp_set.data.key,
1669                                         hv_msg->body.kvp_set.data.key_size,
1670                                         hv_msg->body.kvp_set.data.value,
1671                                         hv_msg->body.kvp_set.data.value_size))
1672                                         hv_msg->error = HV_S_CONT;
1673                         break;
1674 
1675                 case KVP_OP_DELETE:
1676                         if (kvp_key_delete(pool,
1677                                         hv_msg->body.kvp_delete.key,
1678                                         hv_msg->body.kvp_delete.key_size))
1679                                         hv_msg->error = HV_S_CONT;
1680                         break;
1681 
1682                 default:
1683                         break;
1684                 }
1685 
1686                 if (op != KVP_OP_ENUMERATE)
1687                         goto kvp_done;
1688 
1689                 /*
1690                  * If the pool is KVP_POOL_AUTO, dynamically generate
1691                  * both the key and the value; if not read from the
1692                  * appropriate pool.
1693                  */
1694                 if (pool != KVP_POOL_AUTO) {
1695                         if (kvp_pool_enumerate(pool,
1696                                         hv_msg->body.kvp_enum_data.index,
1697                                         hv_msg->body.kvp_enum_data.data.key,
1698                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1699                                         hv_msg->body.kvp_enum_data.data.value,
1700                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1701                                         hv_msg->error = HV_S_CONT;
1702                         goto kvp_done;
1703                 }
1704 
1705                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
1706                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1707                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1708 
1709                 switch (hv_msg->body.kvp_enum_data.index) {
1710                 case FullyQualifiedDomainName:
1711                         strcpy(key_value, full_domain_name);
1712                         strcpy(key_name, "FullyQualifiedDomainName");
1713                         break;
1714                 case IntegrationServicesVersion:
1715                         strcpy(key_name, "IntegrationServicesVersion");
1716                         strcpy(key_value, lic_version);
1717                         break;
1718                 case NetworkAddressIPv4:
1719                         kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1720                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1721                         strcpy(key_name, "NetworkAddressIPv4");
1722                         break;
1723                 case NetworkAddressIPv6:
1724                         kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1725                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1726                         strcpy(key_name, "NetworkAddressIPv6");
1727                         break;
1728                 case OSBuildNumber:
1729                         strcpy(key_value, os_build);
1730                         strcpy(key_name, "OSBuildNumber");
1731                         break;
1732                 case OSName:
1733                         strcpy(key_value, os_name);
1734                         strcpy(key_name, "OSName");
1735                         break;
1736                 case OSMajorVersion:
1737                         strcpy(key_value, os_major);
1738                         strcpy(key_name, "OSMajorVersion");
1739                         break;
1740                 case OSMinorVersion:
1741                         strcpy(key_value, os_minor);
1742                         strcpy(key_name, "OSMinorVersion");
1743                         break;
1744                 case OSVersion:
1745                         strcpy(key_value, os_version);
1746                         strcpy(key_name, "OSVersion");
1747                         break;
1748                 case ProcessorArchitecture:
1749                         strcpy(key_value, processor_arch);
1750                         strcpy(key_name, "ProcessorArchitecture");
1751                         break;
1752                 default:
1753                         hv_msg->error = HV_S_CONT;
1754                         break;
1755                 }
1756                 /*
1757                  * Send the value back to the kernel. The response is
1758                  * already in the receive buffer. Update the cn_msg header to
1759                  * reflect the key value that has been added to the message
1760                  */
1761 kvp_done:
1762 
1763                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1764                 incoming_cn_msg->id.val = CN_KVP_VAL;
1765                 incoming_cn_msg->ack = 0;
1766                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1767 
1768                 len = netlink_send(fd, incoming_cn_msg);
1769                 if (len < 0) {
1770                         int saved_errno = errno;
1771                         syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
1772                                         strerror(errno));
1773 
1774                         if (saved_errno == ENOMEM || saved_errno == ENOBUFS) {
1775                                 syslog(LOG_ERR, "send error: ignored");
1776                                 continue;
1777                         }
1778 
1779                         exit(EXIT_FAILURE);
1780                 }
1781         }
1782 
1783 }
1784 

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