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/netlink.h>
  38 #include <ifaddrs.h>
  39 #include <netdb.h>
  40 #include <syslog.h>
  41
  42 /*
  43  * KYS: TODO. Need to register these in the kernel.
  44  *
  45  * The following definitions are shared with the in-kernel component; do not
  46  * change any of this without making the corresponding changes in
  47  * the KVP kernel component.
  48  */
  49 #define CN_KVP_IDX              0x9     /* MSFT KVP functionality */
  50 #define CN_KVP_VAL              0x1 /* This supports queries from the kernel */
  51 #define CN_KVP_USER_VAL         0x2 /* This supports queries from the user  */
  52
  53 /*
  54  * KVP protocol: The user mode component first registers with the
  55  * the kernel component. Subsequently, the kernel component requests, data
  56  * for the specified keys. In response to this message the user mode component
  57  * fills in the value corresponding to the specified key. We overload the
  58  * sequence field in the cn_msg header to define our KVP message types.
  59  *
  60  * We use this infrastructure for also supporting queries from user mode
  61  * application for state that may be maintained in the KVP kernel component.
  62  *
  63  * XXXKYS: Have a shared header file between the user and kernel (TODO)
  64  */
  65
  66 enum kvp_op {
  67         KVP_REGISTER = 0, /* Register the user mode component*/
  68         KVP_KERNEL_GET, /*Kernel is requesting the value for the specified key*/
  69         KVP_KERNEL_SET, /*Kernel is providing the value for the specified key*/
  70         KVP_USER_GET, /*User is requesting the value for the specified key*/
  71         KVP_USER_SET /*User is providing the value for the specified key*/
  72 };
  73
  74 #define HV_KVP_EXCHANGE_MAX_KEY_SIZE    512
  75 #define HV_KVP_EXCHANGE_MAX_VALUE_SIZE  2048
  76
  77 struct hv_ku_msg {
  78         __u32   kvp_index;
  79         __u8  kvp_key[HV_KVP_EXCHANGE_MAX_KEY_SIZE]; /* Key name */
  80         __u8  kvp_value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE]; /* Key  value */
  81 };
  82
  83 enum key_index {
  84         FullyQualifiedDomainName = 0,
  85         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  86         NetworkAddressIPv4,
  87         NetworkAddressIPv6,
  88         OSBuildNumber,
  89         OSName,
  90         OSMajorVersion,
  91         OSMinorVersion,
  92         OSVersion,
  93         ProcessorArchitecture
  94 };
  95
  96 /*
  97  * End of shared definitions.
  98  */
  99
 100 static char kvp_send_buffer[4096];
 101 static char kvp_recv_buffer[4096];
 102 static struct sockaddr_nl addr;
 103
 104 static char *os_name = "";
 105 static char *os_major = "";
 106 static char *os_minor = "";
 107 static char *processor_arch;
 108 static char *os_build;
 109 static char *lic_version;
 110 static struct utsname uts_buf;
 111
 112 void kvp_get_os_info(void)
 113 {
 114         FILE    *file;
 115         char    *p, buf[512];
 116
 117         uname(&uts_buf);
 118         os_build = uts_buf.release;
 119         processor_arch = uts_buf.machine;
 120
 121         /*
 122          * The current windows host (win7) expects the build
 123          * string to be of the form: x.y.z
 124          * Strip additional information we may have.
 125          */
 126         p = strchr(os_build, '-');
 127         if (p)
 128                 *p = '\0';
 129
 130         file = fopen("/etc/SuSE-release", "r");
 131         if (file != NULL)
 132                 goto kvp_osinfo_found;
 133         file  = fopen("/etc/redhat-release", "r");
 134         if (file != NULL)
 135                 goto kvp_osinfo_found;
 136         /*
 137          * Add code for other supported platforms.
 138          */
 139
 140         /*
 141          * We don't have information about the os.
 142          */
 143         os_name = uts_buf.sysname;
 144         return;
 145
 146 kvp_osinfo_found:
 147         /* up to three lines */
 148         p = fgets(buf, sizeof(buf), file);
 149         if (p) {
 150                 p = strchr(buf, '\n');
 151                 if (p)
 152                         *p = '\0';
 153                 p = strdup(buf);
 154                 if (!p)
 155                         goto done;
 156                 os_name = p;
 157
 158                 /* second line */
 159                 p = fgets(buf, sizeof(buf), file);
 160                 if (p) {
 161                         p = strchr(buf, '\n');
 162                         if (p)
 163                                 *p = '\0';
 164                         p = strdup(buf);
 165                         if (!p)
 166                                 goto done;
 167                         os_major = p;
 168
 169                         /* third line */
 170                         p = fgets(buf, sizeof(buf), file);
 171                         if (p)  {
 172                                 p = strchr(buf, '\n');
 173                                 if (p)
 174                                         *p = '\0';
 175                                 p = strdup(buf);
 176                                 if (p)
 177                                         os_minor = p;
 178                         }
 179                 }
 180         }
 181
 182 done:
 183         fclose(file);
 184         return;
 185 }
 186
 187 static int
 188 kvp_get_ip_address(int family, char *buffer, int length)
 189 {
 190         struct ifaddrs *ifap;
 191         struct ifaddrs *curp;
 192         int ipv4_len = strlen("255.255.255.255") + 1;
 193         int ipv6_len = strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
 194         int offset = 0;
 195         const char *str;
 196         char tmp[50];
 197         int error = 0;
 198
 199         /*
 200          * On entry into this function, the buffer is capable of holding the
 201          * maximum key value (2048 bytes).
 202          */
 203
 204         if (getifaddrs(&ifap)) {
 205                 strcpy(buffer, "getifaddrs failed\n");
 206                 return 1;
 207         }
 208
 209         curp = ifap;
 210         while (curp != NULL) {
 211                 if ((curp->ifa_addr != NULL) &&
 212                    (curp->ifa_addr->sa_family == family)) {
 213                         if (family == AF_INET) {
 214                                 struct sockaddr_in *addr =
 215                                 (struct sockaddr_in *) curp->ifa_addr;
 216
 217                                 str = inet_ntop(family, &addr->sin_addr,
 218                                                 tmp, 50);
 219                                 if (str == NULL) {
 220                                         strcpy(buffer, "inet_ntop failed\n");
 221                                         error = 1;
 222                                         goto getaddr_done;
 223                                 }
 224                                 if (offset == 0)
 225                                         strcpy(buffer, tmp);
 226                                 else
 227                                         strcat(buffer, tmp);
 228                                 strcat(buffer, ";");
 229
 230                                 offset += strlen(str) + 1;
 231                                 if ((length - offset) < (ipv4_len + 1))
 232                                         goto getaddr_done;
 233
 234                         } else {
 235
 236                         /*
 237                          * We only support AF_INET and AF_INET6
 238                          * and the list of addresses is separated by a ";".
 239                          */
 240                                 struct sockaddr_in6 *addr =
 241                                 (struct sockaddr_in6 *) curp->ifa_addr;
 242
 243                                 str = inet_ntop(family,
 244                                         &addr->sin6_addr.s6_addr,
 245                                         tmp, 50);
 246                                 if (str == NULL) {
 247                                         strcpy(buffer, "inet_ntop failed\n");
 248                                         error = 1;
 249                                         goto getaddr_done;
 250                                 }
 251                                 if (offset == 0)
 252                                         strcpy(buffer, tmp);
 253                                 else
 254                                         strcat(buffer, tmp);
 255                                 strcat(buffer, ";");
 256                                 offset += strlen(str) + 1;
 257                                 if ((length - offset) < (ipv6_len + 1))
 258                                         goto getaddr_done;
 259
 260                         }
 261
 262                 }
 263                 curp = curp->ifa_next;
 264         }
 265
 266 getaddr_done:
 267         freeifaddrs(ifap);
 268         return error;
 269 }
 270
 271
 272 static int
 273 kvp_get_domain_name(char *buffer, int length)
 274 {
 275         struct addrinfo hints, *info ;
 276         int error = 0;
 277
 278         gethostname(buffer, length);
 279         memset(&hints, 0, sizeof(hints));
 280         hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
 281         hints.ai_socktype = SOCK_STREAM;
 282         hints.ai_flags = AI_CANONNAME;
 283
 284         error = getaddrinfo(buffer, NULL, &hints, &info);
 285         if (error != 0) {
 286                 strcpy(buffer, "getaddrinfo failed\n");
 287                 return error;
 288         }
 289         strcpy(buffer, info->ai_canonname);
 290         freeaddrinfo(info);
 291         return error;
 292 }
 293
 294 static int
 295 netlink_send(int fd, struct cn_msg *msg)
 296 {
 297         struct nlmsghdr *nlh;
 298         unsigned int size;
 299         struct msghdr message;
 300         char buffer[64];
 301         struct iovec iov[2];
 302
 303         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
 304
 305         nlh = (struct nlmsghdr *)buffer;
 306         nlh->nlmsg_seq = 0;
 307         nlh->nlmsg_pid = getpid();
 308         nlh->nlmsg_type = NLMSG_DONE;
 309         nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
 310         nlh->nlmsg_flags = 0;
 311
 312         iov[0].iov_base = nlh;
 313         iov[0].iov_len = sizeof(*nlh);
 314
 315         iov[1].iov_base = msg;
 316         iov[1].iov_len = size;
 317
 318         memset(&message, 0, sizeof(message));
 319         message.msg_name = &addr;
 320         message.msg_namelen = sizeof(addr);
 321         message.msg_iov = iov;
 322         message.msg_iovlen = 2;
 323
 324         return sendmsg(fd, &message, 0);
 325 }
 326
 327 int main(void)
 328 {
 329         int fd, len, sock_opt;
 330         int error;
 331         struct cn_msg *message;
 332         struct pollfd pfd;
 333         struct nlmsghdr *incoming_msg;
 334         struct cn_msg   *incoming_cn_msg;
 335         struct hv_ku_msg *hv_msg;
 336         char    *p;
 337         char    *key_value;
 338         char    *key_name;
 339
 340         daemon(1, 0);
 341         openlog("KVP", 0, LOG_USER);
 342         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 343         /*
 344          * Retrieve OS release information.
 345          */
 346         kvp_get_os_info();
 347
 348         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 349         if (fd < 0) {
 350                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
 351                 exit(-1);
 352         }
 353         addr.nl_family = AF_NETLINK;
 354         addr.nl_pad = 0;
 355         addr.nl_pid = 0;
 356         addr.nl_groups = CN_KVP_IDX;
 357
 358
 359         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
 360         if (error < 0) {
 361                 syslog(LOG_ERR, "bind failed; error:%d", error);
 362                 close(fd);
 363                 exit(-1);
 364         }
 365         sock_opt = addr.nl_groups;
 366         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
 367         /*
 368          * Register ourselves with the kernel.
 369          */
 370         message = (struct cn_msg *)kvp_send_buffer;
 371         message->id.idx = CN_KVP_IDX;
 372         message->id.val = CN_KVP_VAL;
 373         message->seq = KVP_REGISTER;
 374         message->ack = 0;
 375         message->len = 0;
 376
 377         len = netlink_send(fd, message);
 378         if (len < 0) {
 379                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
 380                 close(fd);
 381                 exit(-1);
 382         }
 383
 384         pfd.fd = fd;
 385
 386         while (1) {
 387                 pfd.events = POLLIN;
 388                 pfd.revents = 0;
 389                 poll(&pfd, 1, -1);
 390
 391                 len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
 392
 393                 if (len < 0) {
 394                         syslog(LOG_ERR, "recv failed; error:%d", len);
 395                         close(fd);
 396                         return -1;
 397                 }
 398
 399                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
 400                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
 401
 402                 switch (incoming_cn_msg->seq) {
 403                 case KVP_REGISTER:
 404                         /*
 405                          * Driver is registering with us; stash away the version
 406                          * information.
 407                          */
 408                         p = (char *)incoming_cn_msg->data;
 409                         lic_version = malloc(strlen(p) + 1);
 410                         if (lic_version) {
 411                                 strcpy(lic_version, p);
 412                                 syslog(LOG_INFO, "KVP LIC Version: %s",
 413                                         lic_version);
 414                         } else {
 415                                 syslog(LOG_ERR, "malloc failed");
 416                         }
 417                         continue;
 418
 419                 case KVP_KERNEL_GET:
 420                         break;
 421                 default:
 422                         continue;
 423                 }
 424
 425                 hv_msg = (struct hv_ku_msg *)incoming_cn_msg->data;
 426                 key_name = (char *)hv_msg->kvp_key;
 427                 key_value = (char *)hv_msg->kvp_value;
 428
 429                 switch (hv_msg->kvp_index) {
 430                 case FullyQualifiedDomainName:
 431                         kvp_get_domain_name(key_value,
 432                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 433                         strcpy(key_name, "FullyQualifiedDomainName");
 434                         break;
 435                 case IntegrationServicesVersion:
 436                         strcpy(key_name, "IntegrationServicesVersion");
 437                         strcpy(key_value, lic_version);
 438                         break;
 439                 case NetworkAddressIPv4:
 440                         kvp_get_ip_address(AF_INET, key_value,
 441                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 442                         strcpy(key_name, "NetworkAddressIPv4");
 443                         break;
 444                 case NetworkAddressIPv6:
 445                         kvp_get_ip_address(AF_INET6, key_value,
 446                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 447                         strcpy(key_name, "NetworkAddressIPv6");
 448                         break;
 449                 case OSBuildNumber:
 450                         strcpy(key_value, os_build);
 451                         strcpy(key_name, "OSBuildNumber");
 452                         break;
 453                 case OSName:
 454                         strcpy(key_value, os_name);
 455                         strcpy(key_name, "OSName");
 456                         break;
 457                 case OSMajorVersion:
 458                         strcpy(key_value, os_major);
 459                         strcpy(key_name, "OSMajorVersion");
 460                         break;
 461                 case OSMinorVersion:
 462                         strcpy(key_value, os_minor);
 463                         strcpy(key_name, "OSMinorVersion");
 464                         break;
 465                 case OSVersion:
 466                         strcpy(key_value, os_build);
 467                         strcpy(key_name, "OSVersion");
 468                         break;
 469                 case ProcessorArchitecture:
 470                         strcpy(key_value, processor_arch);
 471                         strcpy(key_name, "ProcessorArchitecture");
 472                         break;
 473                 default:
 474                         strcpy(key_value, "Unknown Key");
 475                         /*
 476                          * We use a null key name to terminate enumeration.
 477                          */
 478                         strcpy(key_name, "");
 479                         break;
 480                 }
 481                 /*
 482                  * Send the value back to the kernel. The response is
 483                  * already in the receive buffer. Update the cn_msg header to
 484                  * reflect the key value that has been added to the message
 485                  */
 486
 487                 incoming_cn_msg->id.idx = CN_KVP_IDX;
 488                 incoming_cn_msg->id.val = CN_KVP_VAL;
 489                 incoming_cn_msg->seq = KVP_USER_SET;
 490                 incoming_cn_msg->ack = 0;
 491                 incoming_cn_msg->len = sizeof(struct hv_ku_msg);
 492
 493                 len = netlink_send(fd, incoming_cn_msg);
 494                 if (len < 0) {
 495                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
 496                         exit(-1);
 497                 }
 498         }
 499
 500 }