2 * An implementation of key value pair (KVP) functionality for Linux.
5 * Copyright (C) 2010, Novell, Inc.
6 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
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.
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
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.
25 #include <sys/types.h>
26 #include <sys/socket.h>
28 #include <sys/utsname.h>
29 #include <linux/types.h>
35 #include <arpa/inet.h>
36 #include <linux/connector.h>
37 #include <linux/netlink.h>
38 #include <sys/socket.h>
44 * KYS: TODO. Need to register these in the kernel.
46 * The following definitions are shared with the in-kernel component; do not
47 * change any of this without making the corresponding changes in
48 * the KVP kernel component.
50 #define CN_KVP_IDX 0x9 /* MSFT KVP functionality */
51 #define CN_KVP_VAL 0x1 /* This supports queries from the kernel */
52 #define CN_KVP_USER_VAL 0x2 /* This supports queries from the user */
55 * KVP protocol: The user mode component first registers with the
56 * the kernel component. Subsequently, the kernel component requests, data
57 * for the specified keys. In response to this message the user mode component
58 * fills in the value corresponding to the specified key. We overload the
59 * sequence field in the cn_msg header to define our KVP message types.
61 * We use this infrastructure for also supporting queries from user mode
62 * application for state that may be maintained in the KVP kernel component.
64 * XXXKYS: Have a shared header file between the user and kernel (TODO)
68 KVP_REGISTER
= 0, /* Register the user mode component*/
69 KVP_KERNEL_GET
, /*Kernel is requesting the value for the specified key*/
70 KVP_KERNEL_SET
, /*Kernel is providing the value for the specified key*/
71 KVP_USER_GET
, /*User is requesting the value for the specified key*/
72 KVP_USER_SET
/*User is providing the value for the specified key*/
75 #define HV_KVP_EXCHANGE_MAX_KEY_SIZE 512
76 #define HV_KVP_EXCHANGE_MAX_VALUE_SIZE 2048
80 __u8 kvp_key
[HV_KVP_EXCHANGE_MAX_KEY_SIZE
]; /* Key name */
81 __u8 kvp_value
[HV_KVP_EXCHANGE_MAX_VALUE_SIZE
]; /* Key value */
85 FullyQualifiedDomainName
= 0,
86 IntegrationServicesVersion
, /*This key is serviced in the kernel*/
98 * End of shared definitions.
101 static char kvp_send_buffer
[4096];
102 static char kvp_recv_buffer
[4096];
103 static struct sockaddr_nl addr
;
105 static char os_name
[100];
106 static char os_major
[50];
107 static char os_minor
[50];
108 static char processor_arch
[50];
109 static char os_build
[100];
110 static char *lic_version
;
112 void kvp_get_os_info(void)
119 strcpy(os_build
, buf
.release
);
120 strcpy(processor_arch
, buf
.machine
);
122 file
= fopen("/etc/SuSE-release", "r");
124 goto kvp_osinfo_found
;
125 file
= fopen("/etc/redhat-release", "r");
127 goto kvp_osinfo_found
;
129 * Add code for other supported platforms.
133 * We don't have information about the os.
135 strcpy(os_name
, "Linux");
136 strcpy(os_major
, "0");
137 strcpy(os_minor
, "0");
141 fgets(os_name
, 99, file
);
142 eol
= index(os_name
, '\n');
144 fgets(os_major
, 49, file
);
145 eol
= index(os_major
, '\n');
147 fgets(os_minor
, 49, file
);
148 eol
= index(os_minor
, '\n');
155 kvp_get_ip_address(int family
, char *buffer
, int length
)
157 struct ifaddrs
*ifap
;
158 struct ifaddrs
*curp
;
159 int ipv4_len
= strlen("255.255.255.255") + 1;
160 int ipv6_len
= strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
167 * On entry into this function, the buffer is capable of holding the
168 * maximum key value (2048 bytes).
171 if (getifaddrs(&ifap
)) {
172 strcpy(buffer
, "getifaddrs failed\n");
177 while (curp
!= NULL
) {
178 if ((curp
->ifa_addr
!= NULL
) &&
179 (curp
->ifa_addr
->sa_family
== family
)) {
180 if (family
== AF_INET
) {
181 struct sockaddr_in
*addr
=
182 (struct sockaddr_in
*) curp
->ifa_addr
;
184 str
= inet_ntop(family
, &addr
->sin_addr
,
187 strcpy(buffer
, "inet_ntop failed\n");
197 offset
+= strlen(str
) + 1;
198 if ((length
- offset
) < (ipv4_len
+ 1))
204 * We only support AF_INET and AF_INET6
205 * and the list of addresses is separated by a ";".
207 struct sockaddr_in6
*addr
=
208 (struct sockaddr_in6
*) curp
->ifa_addr
;
210 str
= inet_ntop(family
,
211 &addr
->sin6_addr
.s6_addr
,
214 strcpy(buffer
, "inet_ntop failed\n");
223 offset
+= strlen(str
) + 1;
224 if ((length
- offset
) < (ipv6_len
+ 1))
230 curp
= curp
->ifa_next
;
240 kvp_get_domain_name(char *buffer
, int length
)
242 struct addrinfo hints
, *info
;
243 gethostname(buffer
, length
);
246 memset(&hints
, 0, sizeof(hints
));
247 hints
.ai_family
= AF_INET
; /*Get only ipv4 addrinfo. */
248 hints
.ai_socktype
= SOCK_STREAM
;
249 hints
.ai_flags
= AI_CANONNAME
;
251 error
= getaddrinfo(buffer
, "http", &hints
, &info
);
253 strcpy(buffer
, "getaddrinfo failed\n");
255 goto get_domain_done
;
257 strcpy(buffer
, info
->ai_canonname
);
264 netlink_send(int fd
, struct cn_msg
*msg
)
266 struct nlmsghdr
*nlh
;
268 struct msghdr message
;
272 size
= NLMSG_SPACE(sizeof(struct cn_msg
) + msg
->len
);
274 nlh
= (struct nlmsghdr
*)buffer
;
276 nlh
->nlmsg_pid
= getpid();
277 nlh
->nlmsg_type
= NLMSG_DONE
;
278 nlh
->nlmsg_len
= NLMSG_LENGTH(size
- sizeof(*nlh
));
279 nlh
->nlmsg_flags
= 0;
281 iov
[0].iov_base
= nlh
;
282 iov
[0].iov_len
= sizeof(*nlh
);
284 iov
[1].iov_base
= msg
;
285 iov
[1].iov_len
= size
;
287 memset(&message
, 0, sizeof(message
));
288 message
.msg_name
= &addr
;
289 message
.msg_namelen
= sizeof(addr
);
290 message
.msg_iov
= iov
;
291 message
.msg_iovlen
= 2;
293 return sendmsg(fd
, &message
, 0);
298 int fd
, len
, sock_opt
;
300 struct cn_msg
*message
;
302 struct nlmsghdr
*incoming_msg
;
303 struct cn_msg
*incoming_cn_msg
;
309 openlog("KVP", 0, LOG_USER
);
310 syslog(LOG_INFO
, "KVP starting; pid is:%d", getpid());
312 * Retrieve OS release information.
316 fd
= socket(AF_NETLINK
, SOCK_DGRAM
, NETLINK_CONNECTOR
);
318 syslog(LOG_ERR
, "netlink socket creation failed; error:%d", fd
);
321 addr
.nl_family
= AF_NETLINK
;
324 addr
.nl_groups
= CN_KVP_IDX
;
327 error
= bind(fd
, (struct sockaddr
*)&addr
, sizeof(addr
));
329 syslog(LOG_ERR
, "bind failed; error:%d", error
);
333 sock_opt
= addr
.nl_groups
;
334 setsockopt(fd
, 270, 1, &sock_opt
, sizeof(sock_opt
));
336 * Register ourselves with the kernel.
338 message
= (struct cn_msg
*)kvp_send_buffer
;
339 message
->id
.idx
= CN_KVP_IDX
;
340 message
->id
.val
= CN_KVP_VAL
;
341 message
->seq
= KVP_REGISTER
;
345 len
= netlink_send(fd
, message
);
347 syslog(LOG_ERR
, "netlink_send failed; error:%d", len
);
359 len
= recv(fd
, kvp_recv_buffer
, sizeof(kvp_recv_buffer
), 0);
362 syslog(LOG_ERR
, "recv failed; error:%d", len
);
367 incoming_msg
= (struct nlmsghdr
*)kvp_recv_buffer
;
368 incoming_cn_msg
= (struct cn_msg
*)NLMSG_DATA(incoming_msg
);
370 switch (incoming_cn_msg
->seq
) {
373 * Driver is registering with us; stash away the version
376 lic_version
= malloc(strlen(incoming_cn_msg
->data
) + 1);
378 strcpy(lic_version
, incoming_cn_msg
->data
);
379 syslog(LOG_INFO
, "KVP LIC Version: %s",
382 syslog(LOG_ERR
, "malloc failed");
393 ((struct hv_ku_msg
*)incoming_cn_msg
->data
)->kvp_index
;
395 ((struct hv_ku_msg
*)incoming_cn_msg
->data
)->kvp_key
;
397 ((struct hv_ku_msg
*)incoming_cn_msg
->data
)->kvp_value
;
400 case FullyQualifiedDomainName
:
401 kvp_get_domain_name(key_value
,
402 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
403 strcpy(key_name
, "FullyQualifiedDomainName");
405 case IntegrationServicesVersion
:
406 strcpy(key_name
, "IntegrationServicesVersion");
407 strcpy(key_value
, lic_version
);
409 case NetworkAddressIPv4
:
410 kvp_get_ip_address(AF_INET
, key_value
,
411 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
412 strcpy(key_name
, "NetworkAddressIPv4");
414 case NetworkAddressIPv6
:
415 kvp_get_ip_address(AF_INET6
, key_value
,
416 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
417 strcpy(key_name
, "NetworkAddressIPv6");
420 strcpy(key_value
, os_build
);
421 strcpy(key_name
, "OSBuildNumber");
424 strcpy(key_value
, os_name
);
425 strcpy(key_name
, "OSName");
428 strcpy(key_value
, os_major
);
429 strcpy(key_name
, "OSMajorVersion");
432 strcpy(key_value
, os_minor
);
433 strcpy(key_name
, "OSMinorVersion");
436 strcpy(key_value
, os_build
);
437 strcpy(key_name
, "OSVersion");
439 case ProcessorArchitecture
:
440 strcpy(key_value
, processor_arch
);
441 strcpy(key_name
, "ProcessorArchitecture");
444 strcpy(key_value
, "Unknown Key");
446 * We use a null key name to terminate enumeration.
448 strcpy(key_name
, "");
452 * Send the value back to the kernel. The response is
453 * already in the receive buffer. Update the cn_msg header to
454 * reflect the key value that has been added to the message
457 incoming_cn_msg
->id
.idx
= CN_KVP_IDX
;
458 incoming_cn_msg
->id
.val
= CN_KVP_VAL
;
459 incoming_cn_msg
->seq
= KVP_USER_SET
;
460 incoming_cn_msg
->ack
= 0;
461 incoming_cn_msg
->len
= sizeof(struct hv_ku_msg
);
463 len
= netlink_send(fd
, incoming_cn_msg
);
465 syslog(LOG_ERR
, "net_link send failed; error:%d", len
);