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);