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/hyperv.h>
38 #include <linux/netlink.h>
45 * KVP protocol: The user mode component first registers with the
46 * the kernel component. Subsequently, the kernel component requests, data
47 * for the specified keys. In response to this message the user mode component
48 * fills in the value corresponding to the specified key. We overload the
49 * sequence field in the cn_msg header to define our KVP message types.
51 * We use this infrastructure for also supporting queries from user mode
52 * application for state that may be maintained in the KVP kernel component.
58 FullyQualifiedDomainName = 0,
59 IntegrationServicesVersion, /*This key is serviced in the kernel*/
70 static char kvp_send_buffer[4096];
71 static char kvp_recv_buffer[4096];
72 static struct sockaddr_nl addr;
74 static char *os_name = "";
75 static char *os_major = "";
76 static char *os_minor = "";
77 static char *processor_arch;
78 static char *os_build;
79 static char *lic_version;
80 static struct utsname uts_buf;
82 void kvp_get_os_info(void)
88 os_build = uts_buf.release;
89 processor_arch = uts_buf.machine;
92 * The current windows host (win7) expects the build
93 * string to be of the form: x.y.z
94 * Strip additional information we may have.
96 p = strchr(os_build, '-');
100 file = fopen("/etc/SuSE-release", "r");
102 goto kvp_osinfo_found;
103 file = fopen("/etc/redhat-release", "r");
105 goto kvp_osinfo_found;
107 * Add code for other supported platforms.
111 * We don't have information about the os.
113 os_name = uts_buf.sysname;
117 /* up to three lines */
118 p = fgets(buf, sizeof(buf), file);
120 p = strchr(buf, '\n');
129 p = fgets(buf, sizeof(buf), file);
131 p = strchr(buf, '\n');
140 p = fgets(buf, sizeof(buf), file);
142 p = strchr(buf, '\n');
158 kvp_get_ip_address(int family, char *buffer, int length)
160 struct ifaddrs *ifap;
161 struct ifaddrs *curp;
162 int ipv4_len = strlen("255.255.255.255") + 1;
163 int ipv6_len = strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
170 * On entry into this function, the buffer is capable of holding the
171 * maximum key value (2048 bytes).
174 if (getifaddrs(&ifap)) {
175 strcpy(buffer, "getifaddrs failed\n");
180 while (curp != NULL) {
181 if ((curp->ifa_addr != NULL) &&
182 (curp->ifa_addr->sa_family == family)) {
183 if (family == AF_INET) {
184 struct sockaddr_in *addr =
185 (struct sockaddr_in *) curp->ifa_addr;
187 str = inet_ntop(family, &addr->sin_addr,
190 strcpy(buffer, "inet_ntop failed\n");
200 offset += strlen(str) + 1;
201 if ((length - offset) < (ipv4_len + 1))
207 * We only support AF_INET and AF_INET6
208 * and the list of addresses is separated by a ";".
210 struct sockaddr_in6 *addr =
211 (struct sockaddr_in6 *) curp->ifa_addr;
213 str = inet_ntop(family,
214 &addr->sin6_addr.s6_addr,
217 strcpy(buffer, "inet_ntop failed\n");
226 offset += strlen(str) + 1;
227 if ((length - offset) < (ipv6_len + 1))
233 curp = curp->ifa_next;
243 kvp_get_domain_name(char *buffer, int length)
245 struct addrinfo hints, *info ;
248 gethostname(buffer, length);
249 memset(&hints, 0, sizeof(hints));
250 hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
251 hints.ai_socktype = SOCK_STREAM;
252 hints.ai_flags = AI_CANONNAME;
254 error = getaddrinfo(buffer, NULL, &hints, &info);
256 strcpy(buffer, "getaddrinfo failed\n");
259 strcpy(buffer, info->ai_canonname);
265 netlink_send(int fd, struct cn_msg *msg)
267 struct nlmsghdr *nlh;
269 struct msghdr message;
273 size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
275 nlh = (struct nlmsghdr *)buffer;
277 nlh->nlmsg_pid = getpid();
278 nlh->nlmsg_type = NLMSG_DONE;
279 nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
280 nlh->nlmsg_flags = 0;
282 iov[0].iov_base = nlh;
283 iov[0].iov_len = sizeof(*nlh);
285 iov[1].iov_base = msg;
286 iov[1].iov_len = size;
288 memset(&message, 0, sizeof(message));
289 message.msg_name = &addr;
290 message.msg_namelen = sizeof(addr);
291 message.msg_iov = iov;
292 message.msg_iovlen = 2;
294 return sendmsg(fd, &message, 0);
299 int fd, len, sock_opt;
301 struct cn_msg *message;
303 struct nlmsghdr *incoming_msg;
304 struct cn_msg *incoming_cn_msg;
305 struct hv_kvp_msg *hv_msg;
311 openlog("KVP", 0, LOG_USER);
312 syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
314 * Retrieve OS release information.
318 fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
320 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
323 addr.nl_family = AF_NETLINK;
326 addr.nl_groups = CN_KVP_IDX;
329 error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
331 syslog(LOG_ERR, "bind failed; error:%d", error);
335 sock_opt = addr.nl_groups;
336 setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
338 * Register ourselves with the kernel.
340 message = (struct cn_msg *)kvp_send_buffer;
341 message->id.idx = CN_KVP_IDX;
342 message->id.val = CN_KVP_VAL;
344 hv_msg = (struct hv_kvp_msg *)message->data;
345 hv_msg->kvp_hdr.operation = KVP_OP_REGISTER;
347 message->len = sizeof(struct hv_kvp_msg);
349 len = netlink_send(fd, message);
351 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
363 len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
366 syslog(LOG_ERR, "recv failed; error:%d", len);
371 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
372 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
373 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
375 switch (hv_msg->kvp_hdr.operation) {
376 case KVP_OP_REGISTER:
378 * Driver is registering with us; stash away the version
381 p = (char *)hv_msg->body.kvp_version;
382 lic_version = malloc(strlen(p) + 1);
384 strcpy(lic_version, p);
385 syslog(LOG_INFO, "KVP LIC Version: %s",
388 syslog(LOG_ERR, "malloc failed");
396 hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
397 key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
398 key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
400 switch (hv_msg->body.kvp_enum_data.index) {
401 case FullyQualifiedDomainName:
402 kvp_get_domain_name(key_value,
403 HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
404 strcpy(key_name, "FullyQualifiedDomainName");
406 case IntegrationServicesVersion:
407 strcpy(key_name, "IntegrationServicesVersion");
408 strcpy(key_value, lic_version);
410 case NetworkAddressIPv4:
411 kvp_get_ip_address(AF_INET, key_value,
412 HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
413 strcpy(key_name, "NetworkAddressIPv4");
415 case NetworkAddressIPv6:
416 kvp_get_ip_address(AF_INET6, key_value,
417 HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
418 strcpy(key_name, "NetworkAddressIPv6");
421 strcpy(key_value, os_build);
422 strcpy(key_name, "OSBuildNumber");
425 strcpy(key_value, os_name);
426 strcpy(key_name, "OSName");
429 strcpy(key_value, os_major);
430 strcpy(key_name, "OSMajorVersion");
433 strcpy(key_value, os_minor);
434 strcpy(key_name, "OSMinorVersion");
437 strcpy(key_value, os_build);
438 strcpy(key_name, "OSVersion");
440 case ProcessorArchitecture:
441 strcpy(key_value, processor_arch);
442 strcpy(key_name, "ProcessorArchitecture");
445 strcpy(key_value, "Unknown Key");
447 * We use a null key name to terminate enumeration.
449 strcpy(key_name, "");
453 * Send the value back to the kernel. The response is
454 * already in the receive buffer. Update the cn_msg header to
455 * reflect the key value that has been added to the message
458 incoming_cn_msg->id.idx = CN_KVP_IDX;
459 incoming_cn_msg->id.val = CN_KVP_VAL;
460 incoming_cn_msg->ack = 0;
461 incoming_cn_msg->len = sizeof(struct hv_kvp_msg);
463 len = netlink_send(fd, incoming_cn_msg);
465 syslog(LOG_ERR, "net_link send failed; error:%d", len);