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
= "";
106 static char *os_major
= "";
107 static char *os_minor
= "";
108 static char *processor_arch
;
109 static char *os_build
;
110 static char *lic_version
;
111 static struct utsname uts_buf
;
113 void kvp_get_os_info(void)
119 os_build
= uts_buf
.release
;
120 processor_arch
= uts_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 os_name
= uts_buf
.sysname
;
139 /* up to three lines */
140 p
= fgets(buf
, sizeof(buf
), file
);
142 p
= strchr(buf
, '\n');
151 p
= fgets(buf
, sizeof(buf
), file
);
153 p
= strchr(buf
, '\n');
162 p
= fgets(buf
, sizeof(buf
), file
);
164 p
= strchr(buf
, '\n');
180 kvp_get_ip_address(int family
, char *buffer
, int length
)
182 struct ifaddrs
*ifap
;
183 struct ifaddrs
*curp
;
184 int ipv4_len
= strlen("255.255.255.255") + 1;
185 int ipv6_len
= strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
192 * On entry into this function, the buffer is capable of holding the
193 * maximum key value (2048 bytes).
196 if (getifaddrs(&ifap
)) {
197 strcpy(buffer
, "getifaddrs failed\n");
202 while (curp
!= NULL
) {
203 if ((curp
->ifa_addr
!= NULL
) &&
204 (curp
->ifa_addr
->sa_family
== family
)) {
205 if (family
== AF_INET
) {
206 struct sockaddr_in
*addr
=
207 (struct sockaddr_in
*) curp
->ifa_addr
;
209 str
= inet_ntop(family
, &addr
->sin_addr
,
212 strcpy(buffer
, "inet_ntop failed\n");
222 offset
+= strlen(str
) + 1;
223 if ((length
- offset
) < (ipv4_len
+ 1))
229 * We only support AF_INET and AF_INET6
230 * and the list of addresses is separated by a ";".
232 struct sockaddr_in6
*addr
=
233 (struct sockaddr_in6
*) curp
->ifa_addr
;
235 str
= inet_ntop(family
,
236 &addr
->sin6_addr
.s6_addr
,
239 strcpy(buffer
, "inet_ntop failed\n");
248 offset
+= strlen(str
) + 1;
249 if ((length
- offset
) < (ipv6_len
+ 1))
255 curp
= curp
->ifa_next
;
265 kvp_get_domain_name(char *buffer
, int length
)
267 struct addrinfo hints
, *info
;
268 gethostname(buffer
, length
);
271 memset(&hints
, 0, sizeof(hints
));
272 hints
.ai_family
= AF_INET
; /*Get only ipv4 addrinfo. */
273 hints
.ai_socktype
= SOCK_STREAM
;
274 hints
.ai_flags
= AI_CANONNAME
;
276 error
= getaddrinfo(buffer
, "http", &hints
, &info
);
278 strcpy(buffer
, "getaddrinfo failed\n");
280 goto get_domain_done
;
282 strcpy(buffer
, info
->ai_canonname
);
289 netlink_send(int fd
, struct cn_msg
*msg
)
291 struct nlmsghdr
*nlh
;
293 struct msghdr message
;
297 size
= NLMSG_SPACE(sizeof(struct cn_msg
) + msg
->len
);
299 nlh
= (struct nlmsghdr
*)buffer
;
301 nlh
->nlmsg_pid
= getpid();
302 nlh
->nlmsg_type
= NLMSG_DONE
;
303 nlh
->nlmsg_len
= NLMSG_LENGTH(size
- sizeof(*nlh
));
304 nlh
->nlmsg_flags
= 0;
306 iov
[0].iov_base
= nlh
;
307 iov
[0].iov_len
= sizeof(*nlh
);
309 iov
[1].iov_base
= msg
;
310 iov
[1].iov_len
= size
;
312 memset(&message
, 0, sizeof(message
));
313 message
.msg_name
= &addr
;
314 message
.msg_namelen
= sizeof(addr
);
315 message
.msg_iov
= iov
;
316 message
.msg_iovlen
= 2;
318 return sendmsg(fd
, &message
, 0);
323 int fd
, len
, sock_opt
;
325 struct cn_msg
*message
;
327 struct nlmsghdr
*incoming_msg
;
328 struct cn_msg
*incoming_cn_msg
;
329 struct hv_ku_msg
*hv_msg
;
335 openlog("KVP", 0, LOG_USER
);
336 syslog(LOG_INFO
, "KVP starting; pid is:%d", getpid());
338 * Retrieve OS release information.
342 fd
= socket(AF_NETLINK
, SOCK_DGRAM
, NETLINK_CONNECTOR
);
344 syslog(LOG_ERR
, "netlink socket creation failed; error:%d", fd
);
347 addr
.nl_family
= AF_NETLINK
;
350 addr
.nl_groups
= CN_KVP_IDX
;
353 error
= bind(fd
, (struct sockaddr
*)&addr
, sizeof(addr
));
355 syslog(LOG_ERR
, "bind failed; error:%d", error
);
359 sock_opt
= addr
.nl_groups
;
360 setsockopt(fd
, 270, 1, &sock_opt
, sizeof(sock_opt
));
362 * Register ourselves with the kernel.
364 message
= (struct cn_msg
*)kvp_send_buffer
;
365 message
->id
.idx
= CN_KVP_IDX
;
366 message
->id
.val
= CN_KVP_VAL
;
367 message
->seq
= KVP_REGISTER
;
371 len
= netlink_send(fd
, message
);
373 syslog(LOG_ERR
, "netlink_send failed; error:%d", len
);
385 len
= recv(fd
, kvp_recv_buffer
, sizeof(kvp_recv_buffer
), 0);
388 syslog(LOG_ERR
, "recv failed; error:%d", len
);
393 incoming_msg
= (struct nlmsghdr
*)kvp_recv_buffer
;
394 incoming_cn_msg
= (struct cn_msg
*)NLMSG_DATA(incoming_msg
);
396 switch (incoming_cn_msg
->seq
) {
399 * Driver is registering with us; stash away the version
402 p
= (char *)incoming_cn_msg
->data
;
403 lic_version
= malloc(strlen(p
) + 1);
405 strcpy(lic_version
, p
);
406 syslog(LOG_INFO
, "KVP LIC Version: %s",
409 syslog(LOG_ERR
, "malloc failed");
419 hv_msg
= (struct hv_ku_msg
*)incoming_cn_msg
->data
;
420 key_name
= (char *)hv_msg
->kvp_key
;
421 key_value
= (char *)hv_msg
->kvp_value
;
423 switch (hv_msg
->kvp_index
) {
424 case FullyQualifiedDomainName
:
425 kvp_get_domain_name(key_value
,
426 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
427 strcpy(key_name
, "FullyQualifiedDomainName");
429 case IntegrationServicesVersion
:
430 strcpy(key_name
, "IntegrationServicesVersion");
431 strcpy(key_value
, lic_version
);
433 case NetworkAddressIPv4
:
434 kvp_get_ip_address(AF_INET
, key_value
,
435 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
436 strcpy(key_name
, "NetworkAddressIPv4");
438 case NetworkAddressIPv6
:
439 kvp_get_ip_address(AF_INET6
, key_value
,
440 HV_KVP_EXCHANGE_MAX_VALUE_SIZE
);
441 strcpy(key_name
, "NetworkAddressIPv6");
444 strcpy(key_value
, os_build
);
445 strcpy(key_name
, "OSBuildNumber");
448 strcpy(key_value
, os_name
);
449 strcpy(key_name
, "OSName");
452 strcpy(key_value
, os_major
);
453 strcpy(key_name
, "OSMajorVersion");
456 strcpy(key_value
, os_minor
);
457 strcpy(key_name
, "OSMinorVersion");
460 strcpy(key_value
, os_build
);
461 strcpy(key_name
, "OSVersion");
463 case ProcessorArchitecture
:
464 strcpy(key_value
, processor_arch
);
465 strcpy(key_name
, "ProcessorArchitecture");
468 strcpy(key_value
, "Unknown Key");
470 * We use a null key name to terminate enumeration.
472 strcpy(key_name
, "");
476 * Send the value back to the kernel. The response is
477 * already in the receive buffer. Update the cn_msg header to
478 * reflect the key value that has been added to the message
481 incoming_cn_msg
->id
.idx
= CN_KVP_IDX
;
482 incoming_cn_msg
->id
.val
= CN_KVP_VAL
;
483 incoming_cn_msg
->seq
= KVP_USER_SET
;
484 incoming_cn_msg
->ack
= 0;
485 incoming_cn_msg
->len
= sizeof(struct hv_ku_msg
);
487 len
= netlink_send(fd
, incoming_cn_msg
);
489 syslog(LOG_ERR
, "net_link send failed; error:%d", len
);