Tools: hv: Gather ipv[4,6] gateway information
[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         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
90         __u8 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         __u8 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 ret, fd;
200         FILE *filep;
201         size_t records_read;
202         __u8 *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 j, k;
316         int num_records;
317         struct kvp_record *record;
318         int num_blocks;
319
320         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
321                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
322                 return 1;
323
324         /*
325          * First update the in-memory state.
326          */
327         kvp_update_mem_state(pool);
328
329         num_records = kvp_file_info[pool].num_records;
330         record = kvp_file_info[pool].records;
331         num_blocks = kvp_file_info[pool].num_blocks;
332
333         for (i = 0; i < num_records; i++) {
334                 if (memcmp(key, record[i].key, key_size))
335                         continue;
336                 /*
337                  * Found a match; just update the value -
338                  * this is the modify case.
339                  */
340                 memcpy(record[i].value, value, value_size);
341                 kvp_update_file(pool);
342                 return 0;
343         }
344
345         /*
346          * Need to add a new entry;
347          */
348         if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
349                 /* Need to allocate a larger array for reg entries. */
350                 record = realloc(record, sizeof(struct kvp_record) *
351                          ENTRIES_PER_BLOCK * (num_blocks + 1));
352
353                 if (record == NULL)
354                         return 1;
355                 kvp_file_info[pool].num_blocks++;
356
357         }
358         memcpy(record[i].value, value, value_size);
359         memcpy(record[i].key, key, key_size);
360         kvp_file_info[pool].records = record;
361         kvp_file_info[pool].num_records++;
362         kvp_update_file(pool);
363         return 0;
364 }
365
366 static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
367                         int value_size)
368 {
369         int i;
370         int num_records;
371         struct kvp_record *record;
372
373         if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
374                 (value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
375                 return 1;
376
377         /*
378          * First update the in-memory state.
379          */
380         kvp_update_mem_state(pool);
381
382         num_records = kvp_file_info[pool].num_records;
383         record = kvp_file_info[pool].records;
384
385         for (i = 0; i < num_records; i++) {
386                 if (memcmp(key, record[i].key, key_size))
387                         continue;
388                 /*
389                  * Found a match; just copy the value out.
390                  */
391                 memcpy(value, record[i].value, value_size);
392                 return 0;
393         }
394
395         return 1;
396 }
397
398 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
399                                 __u8 *value, int value_size)
400 {
401         struct kvp_record *record;
402
403         /*
404          * First update our in-memory database.
405          */
406         kvp_update_mem_state(pool);
407         record = kvp_file_info[pool].records;
408
409         if (index >= kvp_file_info[pool].num_records) {
410                 return 1;
411         }
412
413         memcpy(key, record[index].key, key_size);
414         memcpy(value, record[index].value, value_size);
415         return 0;
416 }
417
418
419 void kvp_get_os_info(void)
420 {
421         FILE    *file;
422         char    *p, buf[512];
423
424         uname(&uts_buf);
425         os_build = uts_buf.release;
426         processor_arch = uts_buf.machine;
427
428         /*
429          * The current windows host (win7) expects the build
430          * string to be of the form: x.y.z
431          * Strip additional information we may have.
432          */
433         p = strchr(os_build, '-');
434         if (p)
435                 *p = '\0';
436
437         file = fopen("/etc/SuSE-release", "r");
438         if (file != NULL)
439                 goto kvp_osinfo_found;
440         file  = fopen("/etc/redhat-release", "r");
441         if (file != NULL)
442                 goto kvp_osinfo_found;
443         /*
444          * Add code for other supported platforms.
445          */
446
447         /*
448          * We don't have information about the os.
449          */
450         os_name = uts_buf.sysname;
451         return;
452
453 kvp_osinfo_found:
454         /* up to three lines */
455         p = fgets(buf, sizeof(buf), file);
456         if (p) {
457                 p = strchr(buf, '\n');
458                 if (p)
459                         *p = '\0';
460                 p = strdup(buf);
461                 if (!p)
462                         goto done;
463                 os_name = p;
464
465                 /* second line */
466                 p = fgets(buf, sizeof(buf), file);
467                 if (p) {
468                         p = strchr(buf, '\n');
469                         if (p)
470                                 *p = '\0';
471                         p = strdup(buf);
472                         if (!p)
473                                 goto done;
474                         os_major = p;
475
476                         /* third line */
477                         p = fgets(buf, sizeof(buf), file);
478                         if (p)  {
479                                 p = strchr(buf, '\n');
480                                 if (p)
481                                         *p = '\0';
482                                 p = strdup(buf);
483                                 if (p)
484                                         os_minor = p;
485                         }
486                 }
487         }
488
489 done:
490         fclose(file);
491         return;
492 }
493
494 static void kvp_process_ipconfig_file(char *cmd,
495                                         char *config_buf, int len,
496                                         int element_size, int offset)
497 {
498         char buf[256];
499         char *p;
500         char *x;
501         FILE *file;
502
503         /*
504          * First execute the command.
505          */
506         file = popen(cmd, "r");
507         if (file == NULL)
508                 return;
509
510         if (offset == 0)
511                 memset(config_buf, 0, len);
512         while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
513                 if ((len - strlen(config_buf)) < (element_size + 1))
514                         break;
515
516                 x = strchr(p, '\n');
517                 *x = '\0';
518                 strcat(config_buf, p);
519                 strcat(config_buf, ";");
520         }
521         pclose(file);
522 }
523
524 static void kvp_get_ipconfig_info(char *if_name,
525                                  struct hv_kvp_ipaddr_value *buffer)
526 {
527         char cmd[512];
528
529         /*
530          * Get the address of default gateway (ipv4).
531          */
532         sprintf(cmd, "%s %s", "ip route show dev", if_name);
533         strcat(cmd, " | awk '/default/ {print $3 }'");
534
535         /*
536          * Execute the command to gather gateway info.
537          */
538         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
539                                 (MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
540
541         /*
542          * Get the address of default gateway (ipv6).
543          */
544         sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
545         strcat(cmd, " | awk '/default/ {print $3 }'");
546
547         /*
548          * Execute the command to gather gateway info (ipv6).
549          */
550         kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
551                                 (MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
552
553 }
554
555
556 static unsigned int hweight32(unsigned int *w)
557 {
558         unsigned int res = *w - ((*w >> 1) & 0x55555555);
559         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
560         res = (res + (res >> 4)) & 0x0F0F0F0F;
561         res = res + (res >> 8);
562         return (res + (res >> 16)) & 0x000000FF;
563 }
564
565 static int kvp_process_ip_address(void *addrp,
566                                 int family, char *buffer,
567                                 int length,  int *offset)
568 {
569         struct sockaddr_in *addr;
570         struct sockaddr_in6 *addr6;
571         int addr_length;
572         char tmp[50];
573         const char *str;
574
575         if (family == AF_INET) {
576                 addr = (struct sockaddr_in *)addrp;
577                 str = inet_ntop(family, &addr->sin_addr, tmp, 50);
578                 addr_length = INET_ADDRSTRLEN;
579         } else {
580                 addr6 = (struct sockaddr_in6 *)addrp;
581                 str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
582                 addr_length = INET6_ADDRSTRLEN;
583         }
584
585         if ((length - *offset) < addr_length + 1)
586                 return 1;
587         if (str == NULL) {
588                 strcpy(buffer, "inet_ntop failed\n");
589                 return 1;
590         }
591         if (*offset == 0)
592                 strcpy(buffer, tmp);
593         else
594                 strcat(buffer, tmp);
595         strcat(buffer, ";");
596
597         *offset += strlen(str) + 1;
598         return 0;
599 }
600
601 static int
602 kvp_get_ip_address(int family, char *if_name, int op,
603                  void  *out_buffer, int length)
604 {
605         struct ifaddrs *ifap;
606         struct ifaddrs *curp;
607         int offset = 0;
608         int sn_offset = 0;
609         int error = 0;
610         char *buffer;
611         struct hv_kvp_ipaddr_value *ip_buffer;
612         char cidr_mask[5]; /* /xyz */
613         int weight;
614         int i;
615         unsigned int *w;
616         char *sn_str;
617         struct sockaddr_in6 *addr6;
618
619         if (op == KVP_OP_ENUMERATE) {
620                 buffer = out_buffer;
621         } else {
622                 ip_buffer = out_buffer;
623                 buffer = (char *)ip_buffer->ip_addr;
624                 ip_buffer->addr_family = 0;
625         }
626         /*
627          * On entry into this function, the buffer is capable of holding the
628          * maximum key value.
629          */
630
631         if (getifaddrs(&ifap)) {
632                 strcpy(buffer, "getifaddrs failed\n");
633                 return 1;
634         }
635
636         curp = ifap;
637         while (curp != NULL) {
638                 if (curp->ifa_addr == NULL) {
639                         curp = curp->ifa_next;
640                         continue;
641                 }
642
643                 if ((if_name != NULL) &&
644                         (strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
645                         /*
646                          * We want info about a specific interface;
647                          * just continue.
648                          */
649                         curp = curp->ifa_next;
650                         continue;
651                 }
652
653                 /*
654                  * We only support two address families: AF_INET and AF_INET6.
655                  * If a family value of 0 is specified, we collect both
656                  * supported address families; if not we gather info on
657                  * the specified address family.
658                  */
659                 if ((family != 0) && (curp->ifa_addr->sa_family != family)) {
660                         curp = curp->ifa_next;
661                         continue;
662                 }
663                 if ((curp->ifa_addr->sa_family != AF_INET) &&
664                         (curp->ifa_addr->sa_family != AF_INET6)) {
665                         curp = curp->ifa_next;
666                         continue;
667                 }
668
669                 if (op == KVP_OP_GET_IP_INFO) {
670                         /*
671                          * Gather info other than the IP address.
672                          * IP address info will be gathered later.
673                          */
674                         if (curp->ifa_addr->sa_family == AF_INET) {
675                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
676                                 /*
677                                  * Get subnet info.
678                                  */
679                                 error = kvp_process_ip_address(
680                                                              curp->ifa_netmask,
681                                                              AF_INET,
682                                                              (char *)
683                                                              ip_buffer->sub_net,
684                                                              length,
685                                                              &sn_offset);
686                                 if (error)
687                                         goto gather_ipaddr;
688                         } else {
689                                 ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
690
691                                 /*
692                                  * Get subnet info in CIDR format.
693                                  */
694                                 weight = 0;
695                                 sn_str = (char *)ip_buffer->sub_net;
696                                 addr6 = (struct sockaddr_in6 *)
697                                         curp->ifa_netmask;
698                                 w = addr6->sin6_addr.s6_addr32;
699
700                                 for (i = 0; i < 4; i++)
701                                         weight += hweight32(&w[i]);
702
703                                 sprintf(cidr_mask, "/%d", weight);
704                                 if ((length - sn_offset) <
705                                         (strlen(cidr_mask) + 1))
706                                         goto gather_ipaddr;
707
708                                 if (sn_offset == 0)
709                                         strcpy(sn_str, cidr_mask);
710                                 else
711                                         strcat(sn_str, cidr_mask);
712                                 strcat((char *)ip_buffer->sub_net, ";");
713                                 sn_offset += strlen(sn_str) + 1;
714                         }
715
716                         /*
717                          * Collect other ip related configuration info.
718                          */
719
720                         kvp_get_ipconfig_info(if_name, ip_buffer);
721                 }
722
723 gather_ipaddr:
724                 error = kvp_process_ip_address(curp->ifa_addr,
725                                                 curp->ifa_addr->sa_family,
726                                                 buffer,
727                                                 length, &offset);
728                 if (error)
729                         goto getaddr_done;
730
731                 curp = curp->ifa_next;
732         }
733
734 getaddr_done:
735         freeifaddrs(ifap);
736         return error;
737 }
738
739
740 static int
741 kvp_get_domain_name(char *buffer, int length)
742 {
743         struct addrinfo hints, *info ;
744         int error = 0;
745
746         gethostname(buffer, length);
747         memset(&hints, 0, sizeof(hints));
748         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
749         hints.ai_socktype = SOCK_STREAM;
750         hints.ai_flags = AI_CANONNAME;
751
752         error = getaddrinfo(buffer, NULL, &hints, &info);
753         if (error != 0) {
754                 strcpy(buffer, "getaddrinfo failed\n");
755                 return error;
756         }
757         strcpy(buffer, info->ai_canonname);
758         freeaddrinfo(info);
759         return error;
760 }
761
762 static int
763 netlink_send(int fd, struct cn_msg *msg)
764 {
765         struct nlmsghdr *nlh;
766         unsigned int size;
767         struct msghdr message;
768         char buffer[64];
769         struct iovec iov[2];
770
771         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
772
773         nlh = (struct nlmsghdr *)buffer;
774         nlh->nlmsg_seq = 0;
775         nlh->nlmsg_pid = getpid();
776         nlh->nlmsg_type = NLMSG_DONE;
777         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
778         nlh->nlmsg_flags = 0;
779
780         iov[0].iov_base = nlh;
781         iov[0].iov_len = sizeof(*nlh);
782
783         iov[1].iov_base = msg;
784         iov[1].iov_len = size;
785
786         memset(&message, 0, sizeof(message));
787         message.msg_name = &addr;
788         message.msg_namelen = sizeof(addr);
789         message.msg_iov = iov;
790         message.msg_iovlen = 2;
791
792         return sendmsg(fd, &message, 0);
793 }
794
795 int main(void)
796 {
797         int fd, len, sock_opt;
798         int error;
799         struct cn_msg *message;
800         struct pollfd pfd;
801         struct nlmsghdr *incoming_msg;
802         struct cn_msg   *incoming_cn_msg;
803         struct hv_kvp_msg *hv_msg;
804         char    *p;
805         char    *key_value;
806         char    *key_name;
807         int     op;
808         int     pool;
809
810         daemon(1, 0);
811         openlog("KVP", 0, LOG_USER);
812         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
813         /*
814          * Retrieve OS release information.
815          */
816         kvp_get_os_info();
817
818         if (kvp_file_init()) {
819                 syslog(LOG_ERR, "Failed to initialize the pools");
820                 exit(-1);
821         }
822
823         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
824         if (fd < 0) {
825                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
826                 exit(-1);
827         }
828         addr.nl_family = AF_NETLINK;
829         addr.nl_pad = 0;
830         addr.nl_pid = 0;
831         addr.nl_groups = CN_KVP_IDX;
832
833
834         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
835         if (error < 0) {
836                 syslog(LOG_ERR, "bind failed; error:%d", error);
837                 close(fd);
838                 exit(-1);
839         }
840         sock_opt = addr.nl_groups;
841         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
842         /*
843          * Register ourselves with the kernel.
844          */
845         message = (struct cn_msg *)kvp_send_buffer;
846         message->id.idx = CN_KVP_IDX;
847         message->id.val = CN_KVP_VAL;
848
849         hv_msg = (struct hv_kvp_msg *)message->data;
850         hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
851         message->ack = 0;
852         message->len = sizeof(struct hv_kvp_msg);
853
854         len = netlink_send(fd, message);
855         if (len < 0) {
856                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
857                 close(fd);
858                 exit(-1);
859         }
860
861         pfd.fd = fd;
862
863         while (1) {
864                 struct sockaddr *addr_p = (struct sockaddr *) &addr;
865                 socklen_t addr_l = sizeof(addr);
866                 pfd.events = POLLIN;
867                 pfd.revents = 0;
868                 poll(&pfd, 1, -1);
869
870                 len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
871                                 addr_p, &addr_l);
872
873                 if (len < 0 || addr.nl_pid) {
874                         syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
875                                         addr.nl_pid, errno, strerror(errno));
876                         close(fd);
877                         return -1;
878                 }
879
880                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
881                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
882                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
883
884                 /*
885                  * We will use the KVP header information to pass back
886                  * the error from this daemon. So, first copy the state
887                  * and set the error code to success.
888                  */
889                 op = hv_msg->kvp_hdr.operation;
890                 pool = hv_msg->kvp_hdr.pool;
891                 hv_msg->error = HV_S_OK;
892
893                 if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
894                         /*
895                          * Driver is registering with us; stash away the version
896                          * information.
897                          */
898                         in_hand_shake = 0;
899                         p = (char *)hv_msg->body.kvp_register.version;
900                         lic_version = malloc(strlen(p) + 1);
901                         if (lic_version) {
902                                 strcpy(lic_version, p);
903                                 syslog(LOG_INFO, "KVP LIC Version: %s",
904                                         lic_version);
905                         } else {
906                                 syslog(LOG_ERR, "malloc failed");
907                         }
908                         continue;
909                 }
910
911                 switch (op) {
912                 case KVP_OP_SET:
913                         if (kvp_key_add_or_modify(pool,
914                                         hv_msg->body.kvp_set.data.key,
915                                         hv_msg->body.kvp_set.data.key_size,
916                                         hv_msg->body.kvp_set.data.value,
917                                         hv_msg->body.kvp_set.data.value_size))
918                                         hv_msg->error = HV_S_CONT;
919                         break;
920
921                 case KVP_OP_GET:
922                         if (kvp_get_value(pool,
923                                         hv_msg->body.kvp_set.data.key,
924                                         hv_msg->body.kvp_set.data.key_size,
925                                         hv_msg->body.kvp_set.data.value,
926                                         hv_msg->body.kvp_set.data.value_size))
927                                         hv_msg->error = HV_S_CONT;
928                         break;
929
930                 case KVP_OP_DELETE:
931                         if (kvp_key_delete(pool,
932                                         hv_msg->body.kvp_delete.key,
933                                         hv_msg->body.kvp_delete.key_size))
934                                         hv_msg->error = HV_S_CONT;
935                         break;
936
937                 default:
938                         break;
939                 }
940
941                 if (op != KVP_OP_ENUMERATE)
942                         goto kvp_done;
943
944                 /*
945                  * If the pool is KVP_POOL_AUTO, dynamically generate
946                  * both the key and the value; if not read from the
947                  * appropriate pool.
948                  */
949                 if (pool != KVP_POOL_AUTO) {
950                         if (kvp_pool_enumerate(pool,
951                                         hv_msg->body.kvp_enum_data.index,
952                                         hv_msg->body.kvp_enum_data.data.key,
953                                         HV_KVP_EXCHANGE_MAX_KEY_SIZE,
954                                         hv_msg->body.kvp_enum_data.data.value,
955                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
956                                         hv_msg->error = HV_S_CONT;
957                         goto kvp_done;
958                 }
959
960                 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
961                 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
962                 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
963
964                 switch (hv_msg->body.kvp_enum_data.index) {
965                 case FullyQualifiedDomainName:
966                         kvp_get_domain_name(key_value,
967                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
968                         strcpy(key_name, "FullyQualifiedDomainName");
969                         break;
970                 case IntegrationServicesVersion:
971                         strcpy(key_name, "IntegrationServicesVersion");
972                         strcpy(key_value, lic_version);
973                         break;
974                 case NetworkAddressIPv4:
975                         kvp_get_ip_address(AF_INET, NULL, KVP_OP_ENUMERATE,
976                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
977                         strcpy(key_name, "NetworkAddressIPv4");
978                         break;
979                 case NetworkAddressIPv6:
980                         kvp_get_ip_address(AF_INET6, NULL, KVP_OP_ENUMERATE,
981                                 key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
982                         strcpy(key_name, "NetworkAddressIPv6");
983                         break;
984                 case OSBuildNumber:
985                         strcpy(key_value, os_build);
986                         strcpy(key_name, "OSBuildNumber");
987                         break;
988                 case OSName:
989                         strcpy(key_value, os_name);
990                         strcpy(key_name, "OSName");
991                         break;
992                 case OSMajorVersion:
993                         strcpy(key_value, os_major);
994                         strcpy(key_name, "OSMajorVersion");
995                         break;
996                 case OSMinorVersion:
997                         strcpy(key_value, os_minor);
998                         strcpy(key_name, "OSMinorVersion");
999                         break;
1000                 case OSVersion:
1001                         strcpy(key_value, os_build);
1002                         strcpy(key_name, "OSVersion");
1003                         break;
1004                 case ProcessorArchitecture:
1005                         strcpy(key_value, processor_arch);
1006                         strcpy(key_name, "ProcessorArchitecture");
1007                         break;
1008                 default:
1009                         hv_msg->error = HV_S_CONT;
1010                         break;
1011                 }
1012                 /*
1013                  * Send the value back to the kernel. The response is
1014                  * already in the receive buffer. Update the cn_msg header to
1015                  * reflect the key value that has been added to the message
1016                  */
1017 kvp_done:
1018
1019                 incoming_cn_msg->id.idx = CN_KVP_IDX;
1020                 incoming_cn_msg->id.val = CN_KVP_VAL;
1021                 incoming_cn_msg->ack = 0;
1022                 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
1023
1024                 len = netlink_send(fd, incoming_cn_msg);
1025                 if (len < 0) {
1026                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
1027                         exit(-1);
1028                 }
1029         }
1030
1031 }