cfa23a115d189325619d434e426c221bcbe4fee8
[linux-3.10.git] / tools / hv / hv_kvp_daemon.c
1 /*
2  * An implementation of key value pair (KVP) functionality for Linux.
3  *
4  *
5  * Copyright (C) 2010, Novell, Inc.
6  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published
10  * by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15  * NON INFRINGEMENT.  See the GNU General Public License for more
16  * details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21  *
22  */
23
24
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/poll.h>
28 #include <sys/utsname.h>
29 #include <linux/types.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <unistd.h>
33 #include <string.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
45 /*
46  * KVP protocol: The user mode component first registers with the
47  * the kernel component. Subsequently, the kernel component requests, data
48  * for the specified keys. In response to this message the user mode component
49  * fills in the value corresponding to the specified key. We overload the
50  * sequence field in the cn_msg header to define our KVP message types.
51  *
52  * We use this infrastructure for also supporting queries from user mode
53  * application for state that may be maintained in the KVP kernel component.
54  *
55  */
56
57
58 enum key_index {
59         FullyQualifiedDomainName = 0,
60         IntegrationServicesVersion, /*This key is serviced in the kernel*/
61         NetworkAddressIPv4,
62         NetworkAddressIPv6,
63         OSBuildNumber,
64         OSName,
65         OSMajorVersion,
66         OSMinorVersion,
67         OSVersion,
68         ProcessorArchitecture
69 };
70
71 static char kvp_send_buffer[4096];
72 static char kvp_recv_buffer[4096 * 2];
73 static struct sockaddr_nl addr;
74 static int in_hand_shake = 1;
75
76 static char *os_name = "";
77 static char *os_major = "";
78 static char *os_minor = "";
79 static char *processor_arch;
80 static char *os_build;
81 static char *lic_version = "Unknown version";
82 static struct utsname uts_buf;
83
84
85 #define MAX_FILE_NAME 100
86 #define ENTRIES_PER_BLOCK 50
87
88 struct kvp_record {
89         char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
90         char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
91 };
92
93 struct kvp_file_state {
94         int fd;
95         int num_blocks;
96         struct kvp_record *records;
97         int num_records;
98         char fname[MAX_FILE_NAME];
99 };
100
101 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
102
103 static void kvp_acquire_lock(int pool)
104 {
105         struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
106         fl.l_pid = getpid();
107
108         if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
109                 syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
110                 exit(-1);
111         }
112 }
113
114 static void kvp_release_lock(int pool)
115 {
116         struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
117         fl.l_pid = getpid();
118
119         if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
120                 perror("fcntl");
121                 syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
122                 exit(-1);
123         }
124 }
125
126 static void kvp_update_file(int pool)
127 {
128         FILE *filep;
129         size_t bytes_written;
130
131         /*
132          * We are going to write our in-memory registry out to
133          * disk; acquire the lock first.
134          */
135         kvp_acquire_lock(pool);
136
137         filep = fopen(kvp_file_info[pool].fname, "w");
138         if (!filep) {
139                 kvp_release_lock(pool);
140                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
141                 exit(-1);
142         }
143
144         bytes_written = fwrite(kvp_file_info[pool].records,
145                                 sizeof(struct kvp_record),
146                                 kvp_file_info[pool].num_records, filep);
147
148         fflush(filep);
149         kvp_release_lock(pool);
150 }
151
152 static void kvp_update_mem_state(int pool)
153 {
154         FILE *filep;
155         size_t records_read = 0;
156         struct kvp_record *record = kvp_file_info[pool].records;
157         struct kvp_record *readp;
158         int num_blocks = kvp_file_info[pool].num_blocks;
159         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
160
161         kvp_acquire_lock(pool);
162
163         filep = fopen(kvp_file_info[pool].fname, "r");
164         if (!filep) {
165                 kvp_release_lock(pool);
166                 syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
167                 exit(-1);
168         }
169         while (!feof(filep)) {
170                 readp = &record[records_read];
171                 records_read += fread(readp, sizeof(struct kvp_record),
172                                         ENTRIES_PER_BLOCK * num_blocks,
173                                         filep);
174
175                 if (!feof(filep)) {
176                         /*
177                          * We have more data to read.
178                          */
179                         num_blocks++;
180                         record = realloc(record, alloc_unit * num_blocks);
181
182                         if (record == NULL) {
183                                 syslog(LOG_ERR, "malloc failed");
184                                 exit(-1);
185                         }
186                         continue;
187                 }
188                 break;
189         }
190
191         kvp_file_info[pool].num_blocks = num_blocks;
192         kvp_file_info[pool].records = record;
193         kvp_file_info[pool].num_records = records_read;
194
195         kvp_release_lock(pool);
196 }
197 static int kvp_file_init(void)
198 {
199         int  fd;
200         FILE *filep;
201         size_t records_read;
202         char *fname;
203         struct kvp_record *record;
204         struct kvp_record *readp;
205         int num_blocks;
206         int i;
207         int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
208
209         if (access("/var/opt/hyperv", F_OK)) {
210                 if (mkdir("/var/opt/hyperv", S_IRUSR | S_IWUSR | S_IROTH)) {
211                         syslog(LOG_ERR, " Failed to create /var/opt/hyperv");
212                         exit(-1);
213                 }
214         }
215
216         for (i = 0; i < KVP_POOL_COUNT; i++) {
217                 fname = kvp_file_info[i].fname;
218                 records_read = 0;
219                 num_blocks = 1;
220                 sprintf(fname, "/var/opt/hyperv/.kvp_pool_%d", i);
221                 fd = open(fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IROTH);
222
223                 if (fd == -1)
224                         return 1;
225
226
227                 filep = fopen(fname, "r");
228                 if (!filep)
229                         return 1;
230
231                 record = malloc(alloc_unit * num_blocks);
232                 if (record == NULL) {
233                         fclose(filep);
234                         return 1;
235                 }
236                 while (!feof(filep)) {
237                         readp = &record[records_read];
238                         records_read += fread(readp, sizeof(struct kvp_record),
239                                         ENTRIES_PER_BLOCK,
240                                         filep);
241
242                         if (!feof(filep)) {
243                                 /*
244                                  * We have more data to read.
245                                  */
246                                 num_blocks++;
247                                 record = realloc(record, alloc_unit *
248                                                 num_blocks);
249                                 if (record == NULL) {
250                                         fclose(filep);
251                                         return 1;
252                                 }
253                                 continue;
254                         }
255                         break;
256                 }
257                 kvp_file_info[i].fd = fd;
258                 kvp_file_info[i].num_blocks = num_blocks;
259                 kvp_file_info[i].records = record;
260                 kvp_file_info[i].num_records = records_read;
261                 fclose(filep);
262
263         }
264
265         return 0;
266 }
267
268 static int kvp_key_delete(int pool, __u8 *key, int key_size)
269 {
270         int i;
271         int j, k;
272         int num_records;
273         struct kvp_record *record;
274
275         /*
276          * First update the in-memory state.
277          */
278         kvp_update_mem_state(pool);
279
280         num_records = kvp_file_info[pool].num_records;
281         record = kvp_file_info[pool].records;
282
283         for (i = 0; i < num_records; i++) {
284                 if (memcmp(key, record[i].key, key_size))
285                         continue;
286                 /*
287                  * Found a match; just move the remaining
288                  * entries up.
289                  */
290                 if (i == num_records) {
291                         kvp_file_info[pool].num_records--;
292                         kvp_update_file(pool);
293                         return 0;
294                 }
295
296                 j = i;
297                 k = j + 1;
298                 for (; k < num_records; k++) {
299                         strcpy(record[j].key, record[k].key);
300                         strcpy(record[j].value, record[k].value);
301                         j++;
302                 }
303
304                 kvp_file_info[pool].num_records--;
305                 kvp_update_file(pool);
306                 return 0;
307         }
308         return 1;
309 }
310
311 static int kvp_key_add_or_modify(int pool, __u8 *key, int key_size, __u8 *value,
312                         int value_size)
313 {
314         int i;
315         int num_records;
316         struct kvp_record *record;
317         int num_blocks;
318
319         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
320                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
321                 return 1;
322
323         /*
324          * First update the in-memory state.
325          */
326         kvp_update_mem_state(pool);
327
328         num_records = kvp_file_info[pool].num_records;
329         record = kvp_file_info[pool].records;
330         num_blocks = kvp_file_info[pool].num_blocks;
331
332         for (i = 0; i < num_records; i++) {
333                 if (memcmp(key, record[i].key, key_size))
334                         continue;
335                 /*
336                  * Found a match; just update the value -
337                  * this is the modify case.
338                  */
339                 memcpy(record[i].value, value, value_size);
340                 kvp_update_file(pool);
341                 return 0;
342         }
343
344         /*
345          * Need to add a new entry;
346          */
347         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
348                 /* Need to allocate a larger array for reg entries. */
349                 record = realloc(record, sizeof(struct kvp_record) *
350                          ENTRIES_PER_BLOCK * (num_blocks + 1));
351
352                 if (record == NULL)
353                         return 1;
354                 kvp_file_info[pool].num_blocks++;
355
356         }
357         memcpy(record[i].value, value, value_size);
358         memcpy(record[i].key, key, key_size);
359         kvp_file_info[pool].records = record;
360         kvp_file_info[pool].num_records++;
361         kvp_update_file(pool);
362         return 0;
363 }
364
365 static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
366                         int value_size)
367 {
368         int i;
369         int num_records;
370         struct kvp_record *record;
371
372         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
373                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
374                 return 1;
375
376         /*
377          * First update the in-memory state.
378          */
379         kvp_update_mem_state(pool);
380
381         num_records = kvp_file_info[pool].num_records;
382         record = kvp_file_info[pool].records;
383
384         for (i = 0; i < num_records; i++) {
385                 if (memcmp(key, record[i].key, key_size))
386                         continue;
387                 /*
388                  * Found a match; just copy the value out.
389                  */
390                 memcpy(value, record[i].value, value_size);
391                 return 0;
392         }
393
394         return 1;
395 }
396
397 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
398                                 __u8 *value, int value_size)
399 {
400         struct kvp_record *record;
401
402         /*
403          * First update our in-memory database.
404          */
405         kvp_update_mem_state(pool);
406         record = kvp_file_info[pool].records;
407
408         if (index >= kvp_file_info[pool].num_records) {
409                 return 1;
410         }
411
412         memcpy(key, record[index].key, key_size);
413         memcpy(value, record[index].value, value_size);
414         return 0;
415 }
416
417
418 void kvp_get_os_info(void)
419 {
420         FILE    *file;
421         char    *p, buf[512];
422
423         uname(&uts_buf);
424         os_build = uts_buf.release;
425         processor_arch = uts_buf.machine;
426
427         /*
428          * The current windows host (win7) expects the build
429          * string to be of the form: x.y.z
430          * Strip additional information we may have.
431          */
432         p = strchr(os_build, '-');
433         if (p)
434                 *p = '\0';
435
436         file = fopen("/etc/SuSE-release", "r");
437         if (file != NULL)
438                 goto kvp_osinfo_found;
439         file  = fopen("/etc/redhat-release", "r");
440         if (file != NULL)
441                 goto kvp_osinfo_found;
442         /*
443          * Add code for other supported platforms.
444          */
445
446         /*
447          * We don't have information about the os.
448          */
449         os_name = uts_buf.sysname;
450         return;
451
452 kvp_osinfo_found:
453         /* up to three lines */
454         p = fgets(buf, sizeof(buf), file);
455         if (p) {
456                 p = strchr(buf, '\n');
457                 if (p)
458                         *p = '\0';
459                 p = strdup(buf);
460                 if (!p)
461                         goto done;
462                 os_name = p;
463
464                 /* second line */
465                 p = fgets(buf, sizeof(buf), file);
466                 if (p) {
467                         p = strchr(buf, '\n');
468                         if (p)
469                                 *p = '\0';
470                         p = strdup(buf);
471                         if (!p)
472                                 goto done;
473                         os_major = p;
474
475                         /* third line */
476                         p = fgets(buf, sizeof(buf), file);
477                         if (p)  {
478                                 p = strchr(buf, '\n');
479                                 if (p)
480                                         *p = '\0';
481                                 p = strdup(buf);
482                                 if (p)
483                                         os_minor = p;
484                         }
485                 }
486         }
487
488 done:
489         fclose(file);
490         return;
491 }
492
493 static void kvp_process_ipconfig_file(char *cmd,
494                                         char *config_buf, int len,
495                                         int element_size, int offset)
496 {
497         char buf[256];
498         char *p;
499         char *x;
500         FILE *file;
501
502         /*
503          * First execute the command.
504          */
505         file = popen(cmd, "r");
506         if (file == NULL)
507                 return;
508
509         if (offset == 0)
510                 memset(config_buf, 0, len);
511         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
512                 if ((len - strlen(config_buf)) < (element_size + 1))
513                         break;
514
515                 x = strchr(p, '\n');
516                 *x = '\0';
517                 strcat(config_buf, p);
518                 strcat(config_buf, ";");
519         }
520         pclose(file);
521 }
522
523 static void kvp_get_ipconfig_info(char *if_name,
524                                  struct hv_kvp_ipaddr_value *buffer)
525 {
526         char cmd[512];
527
528         /*
529          * Get the address of default gateway (ipv4).
530          */
531         sprintf(cmd, "%s %s", "ip route show dev", if_name);
532         strcat(cmd, " | awk '/default/ {print $3 }'");
533
534         /*
535          * Execute the command to gather gateway info.
536          */
537         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
538                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
539
540         /*
541          * Get the address of default gateway (ipv6).
542          */
543         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
544         strcat(cmd, " | awk '/default/ {print $3 }'");
545
546         /*
547          * Execute the command to gather gateway info (ipv6).
548          */
549         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
550                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
551
552
553         /*
554          * Gather the DNS  state.
555          * Since there is no standard way to get this information
556          * across various distributions of interest; we just invoke
557          * an external script that needs to be ported across distros
558          * of interest.
559          *
560          * Following is the expected format of the information from the script:
561          *
562          * ipaddr1 (nameserver1)
563          * ipaddr2 (nameserver2)
564          * .
565          * .
566          */
567
568         sprintf(cmd, "%s",  "hv_get_dns_info");
569
570         /*
571          * Execute the command to gather DNS info.
572          */
573         kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
574                                 (MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
575 }
576
577
578 static unsigned int hweight32(unsigned int *w)
579 {
580         unsigned int res = *w - ((*w >> 1) & 0x55555555);
581         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
582         res = (res + (res >> 4)) & 0x0F0F0F0F;
583         res = res + (res >> 8);
584         return (res + (res >> 16)) & 0x000000FF;
585 }
586
587 static int kvp_process_ip_address(void *addrp,
588                                 int family, char *buffer,
589                                 int length,  int *offset)
590 {
591         struct sockaddr_in *addr;
592         struct sockaddr_in6 *addr6;
593         int addr_length;
594         char tmp[50];
595         const char *str;
596
597         if (family == AF_INET) {
598                 addr = (struct sockaddr_in *)addrp;
599                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
600                 addr_length = INET_ADDRSTRLEN;
601         } else {
602                 addr6 = (struct sockaddr_in6 *)addrp;
603                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
604                 addr_length = INET6_ADDRSTRLEN;
605         }
606
607         if ((length - *offset) < addr_length + 1)
608                 return 1;
609         if (str == NULL) {
610                 strcpy(buffer, "inet_ntop failed\n");
611                 return 1;
612         }
613         if (*offset == 0)
614                 strcpy(buffer, tmp);
615         else
616                 strcat(buffer, tmp);
617         strcat(buffer, ";");
618
619         *offset += strlen(str) + 1;
620         return 0;
621 }
622
623 static int
624 kvp_get_ip_address(int family, char *if_name, int op,
625                  void  *out_buffer, int length)
626 {
627         struct ifaddrs *ifap;
628         struct ifaddrs *curp;
629         int offset = 0;
630         int sn_offset = 0;
631         int error = 0;
632         char *buffer;
633         struct hv_kvp_ipaddr_value *ip_buffer;
634         char cidr_mask[5]; /* /xyz */
635         int weight;
636         int i;
637         unsigned int *w;
638         char *sn_str;
639         struct sockaddr_in6 *addr6;
640
641         if (op == KVP_OP_ENUMERATE) {
642                 buffer = out_buffer;
643         } else {
644                 ip_buffer = out_buffer;
645                 buffer = (char *)ip_buffer->ip_addr;
646                 ip_buffer->addr_family = 0;
647         }
648         /*
649          * On entry into this function, the buffer is capable of holding the
650          * maximum key value.
651          */
652
653         if (getifaddrs(&ifap)) {
654                 strcpy(buffer, "getifaddrs failed\n");
655                 return 1;
656         }
657
658         curp = ifap;
659         while (curp != NULL) {
660                 if (curp->ifa_addr == NULL) {
661                         curp = curp->ifa_next;
662                         continue;
663                 }
664
665                 if ((if_name != NULL) &&
666                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
667                         /*
668                          * We want info about a specific interface;
669                          * just continue.
670                          */
671                         curp = curp->ifa_next;
672                         continue;
673                 }
674
675                 /*
676                  * We only support two address families: AF_INET and AF_INET6.
677                  * If a family value of 0 is specified, we collect both
678                  * supported address families; if not we gather info on
679                  * the specified address family.
680                  */
681                 if ((family != 0) && (curp->ifa_addr->sa_family != family)) {
682                         curp = curp->ifa_next;
683                         continue;
684                 }
685                 if ((curp->ifa_addr->sa_family != AF_INET) &&
686                         (curp->ifa_addr->sa_family != AF_INET6)) {
687                         curp = curp->ifa_next;
688                         continue;
689                 }
690
691                 if (op == KVP_OP_GET_IP_INFO) {
692                         /*
693                          * Gather info other than the IP address.
694                          * IP address info will be gathered later.
695                          */
696                         if (curp->ifa_addr->sa_family == AF_INET) {
697                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
698                                 /*
699                                  * Get subnet info.
700                                  */
701                                 error = kvp_process_ip_address(
702                                                              curp->ifa_netmask,
703                                                              AF_INET,
704                                                              (char *)
705                                                              ip_buffer->sub_net,
706                                                              length,
707                                                              &sn_offset);
708                                 if (error)
709                                         goto gather_ipaddr;
710                         } else {
711                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
712
713                                 /*
714                                  * Get subnet info in CIDR format.
715                                  */
716                                 weight = 0;
717                                 sn_str = (char *)ip_buffer->sub_net;
718                                 addr6 = (struct sockaddr_in6 *)
719                                         curp->ifa_netmask;
720                                 w = addr6->sin6_addr.s6_addr32;
721
722                                 for (i = 0; i < 4; i++)
723                                         weight += hweight32(&w[i]);
724
725                                 sprintf(cidr_mask, "/%d", weight);
726                                 if ((length - sn_offset) <
727                                         (strlen(cidr_mask) + 1))
728                                         goto gather_ipaddr;
729
730                                 if (sn_offset == 0)
731                                         strcpy(sn_str, cidr_mask);
732                                 else
733                                         strcat(sn_str, cidr_mask);
734                                 strcat((char *)ip_buffer->sub_net, ";");
735                                 sn_offset += strlen(sn_str) + 1;
736                         }
737
738                         /*
739                          * Collect other ip related configuration info.
740                          */
741
742                         kvp_get_ipconfig_info(if_name, ip_buffer);
743                 }
744
745 gather_ipaddr:
746                 error = kvp_process_ip_address(curp->ifa_addr,
747                                                 curp->ifa_addr->sa_family,
748                                                 buffer,
749                                                 length, &offset);
750                 if (error)
751                         goto getaddr_done;
752
753                 curp = curp->ifa_next;
754         }
755
756 getaddr_done:
757         freeifaddrs(ifap);
758         return error;
759 }
760
761
762 static int
763 kvp_get_domain_name(char *buffer, int length)
764 {
765         struct addrinfo hints, *info ;
766         int error = 0;
767
768         gethostname(buffer, length);
769         memset(&hints, 0, sizeof(hints));
770         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
771         hints.ai_socktype = SOCK_STREAM;
772         hints.ai_flags = AI_CANONNAME;
773
774         error = getaddrinfo(buffer, NULL, &hints, &info);
775         if (error != 0) {
776                 strcpy(buffer, "getaddrinfo failed\n");
777                 return error;
778         }
779         strcpy(buffer, info->ai_canonname);
780         freeaddrinfo(info);
781         return error;
782 }
783
784 static int
785 netlink_send(int fd, struct cn_msg *msg)
786 {
787         struct nlmsghdr *nlh;
788         unsigned int size;
789         struct msghdr message;
790         char buffer[64];
791         struct iovec iov[2];
792
793         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
794
795         nlh = (struct nlmsghdr *)buffer;
796         nlh->nlmsg_seq = 0;
797         nlh->nlmsg_pid = getpid();
798         nlh->nlmsg_type = NLMSG_DONE;
799         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
800         nlh->nlmsg_flags = 0;
801
802         iov[0].iov_base = nlh;
803         iov[0].iov_len = sizeof(*nlh);
804
805         iov[1].iov_base = msg;
806         iov[1].iov_len = size;
807
808         memset(&message, 0, sizeof(message));
809         message.msg_name = &addr;
810         message.msg_namelen = sizeof(addr);
811         message.msg_iov = iov;
812         message.msg_iovlen = 2;
813
814         return sendmsg(fd, &message, 0);
815 }
816
817 int main(void)
818 {
819         int fd, len, sock_opt;
820         int error;
821         struct cn_msg *message;
822         struct pollfd pfd;
823         struct nlmsghdr *incoming_msg;
824         struct cn_msg   *incoming_cn_msg;
825         struct hv_kvp_msg *hv_msg;
826         char    *p;
827         char    *key_value;
828         char    *key_name;
829         int     op;
830         int     pool;
831
832         daemon(1, 0);
833         openlog("KVP", 0, LOG_USER);
834         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
835         /*
836          * Retrieve OS release information.
837          */
838         kvp_get_os_info();
839
840         if (kvp_file_init()) {
841                 syslog(LOG_ERR, "Failed to initialize the pools");
842                 exit(-1);
843         }
844
845         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
846         if (fd < 0) {
847                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
848                 exit(-1);
849         }
850         addr.nl_family = AF_NETLINK;
851         addr.nl_pad = 0;
852         addr.nl_pid = 0;
853         addr.nl_groups = CN_KVP_IDX;
854
855
856         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
857         if (error < 0) {
858                 syslog(LOG_ERR, "bind failed; error:%d", error);
859                 close(fd);
860                 exit(-1);
861         }
862         sock_opt = addr.nl_groups;
863         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
864         /*
865          * Register ourselves with the kernel.
866          */
867         message = (struct cn_msg *)kvp_send_buffer;
868         message->id.idx = CN_KVP_IDX;
869         message->id.val = CN_KVP_VAL;
870
871         hv_msg = (struct hv_kvp_msg *)message->data;
872         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
873         message->ack = 0;
874         message->len = sizeof(struct hv_kvp_msg);
875
876         len = netlink_send(fd, message);
877         if (len < 0) {
878                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
879                 close(fd);
880                 exit(-1);
881         }
882
883         pfd.fd = fd;
884
885         while (1) {
886                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
887                 socklen_t addr_l = sizeof(addr);
888                 pfd.events = POLLIN;
889                 pfd.revents = 0;
890                 poll(&pfd, 1, -1);
891
892                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
893                                 addr_p, &addr_l);
894
895                 if (len < 0 || addr.nl_pid) {
896                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
897                                         addr.nl_pid, errno, strerror(errno));
898                         close(fd);
899                         return -1;
900                 }
901
902                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
903                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
904                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
905
906                 /*
907                  * We will use the KVP header information to pass back
908                  * the error from this daemon. So, first copy the state
909                  * and set the error code to success.
910                  */
911                 op = hv_msg->kvp_hdr.operation;
912                 pool = hv_msg->kvp_hdr.pool;
913                 hv_msg->error = HV_S_OK;
914
915                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
916                         /*
917                          * Driver is registering with us; stash away the version
918                          * information.
919                          */
920                         in_hand_shake = 0;
921                         p = (char *)hv_msg->body.kvp_register.version;
922                         lic_version = malloc(strlen(p) + 1);
923                         if (lic_version) {
924                                 strcpy(lic_version, p);
925                                 syslog(LOG_INFO, "KVP LIC Version: %s",
926                                         lic_version);
927                         } else {
928                                 syslog(LOG_ERR, "malloc failed");
929                         }
930                         continue;
931                 }
932
933                 switch (op) {
934                 case KVP_OP_SET:
935                         if (kvp_key_add_or_modify(pool,
936                                         hv_msg->body.kvp_set.data.key,
937                                         hv_msg->body.kvp_set.data.key_size,
938                                         hv_msg->body.kvp_set.data.value,
939                                         hv_msg->body.kvp_set.data.value_size))
940                                         hv_msg->error = HV_S_CONT;
941                         break;
942
943                 case KVP_OP_GET:
944                         if (kvp_get_value(pool,
945                                         hv_msg->body.kvp_set.data.key,
946                                         hv_msg->body.kvp_set.data.key_size,
947                                         hv_msg->body.kvp_set.data.value,
948                                         hv_msg->body.kvp_set.data.value_size))
949                                         hv_msg->error = HV_S_CONT;
950                         break;
951
952                 case KVP_OP_DELETE:
953                         if (kvp_key_delete(pool,
954                                         hv_msg->body.kvp_delete.key,
955                                         hv_msg->body.kvp_delete.key_size))
956                                         hv_msg->error = HV_S_CONT;
957                         break;
958
959                 default:
960                         break;
961                 }
962
963                 if (op != KVP_OP_ENUMERATE)
964                         goto kvp_done;
965
966                 /*
967                  * If the pool is KVP_POOL_AUTO, dynamically generate
968                  * both the key and the value; if not read from the
969                  * appropriate pool.
970                  */
971                 if (pool != KVP_POOL_AUTO) {
972                         if (kvp_pool_enumerate(pool,
973                                         hv_msg->body.kvp_enum_data.index,
974                                         hv_msg->body.kvp_enum_data.data.key,
975                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
976                                         hv_msg->body.kvp_enum_data.data.value,
977                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
978                                         hv_msg->error = HV_S_CONT;
979                         goto kvp_done;
980                 }
981
982                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
983                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
984                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
985
986                 switch (hv_msg->body.kvp_enum_data.index) {
987                 case FullyQualifiedDomainName:
988                         kvp_get_domain_name(key_value,
989                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
990                         strcpy(key_name, "FullyQualifiedDomainName");
991                         break;
992                 case IntegrationServicesVersion:
993                         strcpy(key_name, "IntegrationServicesVersion");
994                         strcpy(key_value, lic_version);
995                         break;
996                 case NetworkAddressIPv4:
997                         kvp_get_ip_address(AF_INET, NULL, KVP_OP_ENUMERATE,
998                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
999                         strcpy(key_name, "NetworkAddressIPv4");
1000                         break;
1001                 case NetworkAddressIPv6:
1002                         kvp_get_ip_address(AF_INET6, NULL, KVP_OP_ENUMERATE,
1003                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1004                         strcpy(key_name, "NetworkAddressIPv6");
1005                         break;
1006                 case OSBuildNumber:
1007                         strcpy(key_value, os_build);
1008                         strcpy(key_name, "OSBuildNumber");
1009                         break;
1010                 case OSName:
1011                         strcpy(key_value, os_name);
1012                         strcpy(key_name, "OSName");
1013                         break;
1014                 case OSMajorVersion:
1015                         strcpy(key_value, os_major);
1016                         strcpy(key_name, "OSMajorVersion");
1017                         break;
1018                 case OSMinorVersion:
1019                         strcpy(key_value, os_minor);
1020                         strcpy(key_name, "OSMinorVersion");
1021                         break;
1022                 case OSVersion:
1023                         strcpy(key_value, os_build);
1024                         strcpy(key_name, "OSVersion");
1025                         break;
1026                 case ProcessorArchitecture:
1027                         strcpy(key_value, processor_arch);
1028                         strcpy(key_name, "ProcessorArchitecture");
1029                         break;
1030                 default:
1031                         hv_msg->error = HV_S_CONT;
1032                         break;
1033                 }
1034                 /*
1035                  * Send the value back to the kernel. The response is
1036                  * already in the receive buffer. Update the cn_msg header to
1037                  * reflect the key value that has been added to the message
1038                  */
1039 kvp_done:
1040
1041                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1042                 incoming_cn_msg->id.val = CN_KVP_VAL;
1043                 incoming_cn_msg->ack = 0;
1044                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1045
1046                 len = netlink_send(fd, incoming_cn_msg);
1047                 if (len < 0) {
1048                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
1049                         exit(-1);
1050                 }
1051         }
1052
1053 }