drivers/staging/hv/tools/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 <sys/socket.h>
  39 #include <ifaddrs.h>
  40 #include <netdb.h>
  41 #include <syslog.h>
  42
  43 /*
  44  * KYS: TODO. Need to register these in the kernel.
  45  *
  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.
  49  */
  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  */
  53
  54 /*
  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.
  60  *
  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.
  63  *
  64  * XXXKYS: Have a shared header file between the user and kernel (TODO)
  65  */
  66
  67 enum kvp_op {
  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*/
  73 };
  74
  75 #define HV_KVP_EXCHANGE_MAX_KEY_SIZE    512
  76 #define HV_KVP_EXCHANGE_MAX_VALUE_SIZE  2048
  77
  78 struct hv_ku_msg {
  79         __u32   kvp_index;
  80         __u8  kvp_key[HV_KVP_EXCHANGE_MAX_KEY_SIZE]; /* Key name */
  81         __u8  kvp_value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE]; /* Key  value */
  82 };
  83
  84 enum key_index {
  85         FullyQualifiedDomainName = 0,
  86         IntegrationServicesVersion, /*This key is serviced in the kernel*/
  87         NetworkAddressIPv4,
  88         NetworkAddressIPv6,
  89         OSBuildNumber,
  90         OSName,
  91         OSMajorVersion,
  92         OSMinorVersion,
  93         OSVersion,
  94         ProcessorArchitecture
  95 };
  96
  97 /*
  98  * End of shared definitions.
  99  */
 100
 101 static char kvp_send_buffer[4096];
 102 static char kvp_recv_buffer[4096];
 103 static struct sockaddr_nl addr;
 104
 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;
 112
 113 void kvp_get_os_info(void)
 114 {
 115         FILE    *file;
 116         char    *p, buf[512];
 117
 118         uname(&uts_buf);
 119         os_build = uts_buf.release;
 120         processor_arch= uts_buf.machine;
 121
 122         file = fopen("/etc/SuSE-release", "r");
 123         if (file != NULL)
 124                 goto kvp_osinfo_found;
 125         file  = fopen("/etc/redhat-release", "r");
 126         if (file != NULL)
 127                 goto kvp_osinfo_found;
 128         /*
 129          * Add code for other supported platforms.
 130          */
 131
 132         /*
 133          * We don't have information about the os.
 134          */
 135         os_name = uts_buf.sysname;
 136         return;
 137
 138 kvp_osinfo_found:
 139         /* up to three lines */
 140         p = fgets(buf, sizeof(buf), file);
 141         if (p) {
 142                 p = strchr(buf, '\n');
 143                 if (p)
 144                         *p = '\0';
 145                 p = strdup(buf);
 146                 if (!p)
 147                         goto done;
 148                 os_name = p;
 149
 150                 /* second line */
 151                 p = fgets(buf, sizeof(buf), file);
 152                 if (p) {
 153                         p = strchr(buf, '\n');
 154                         if (p)
 155                                 *p = '\0';
 156                         p = strdup(buf);
 157                         if (!p)
 158                                 goto done;
 159                         os_major = p;
 160
 161                         /* third line */
 162                         p = fgets(buf, sizeof(buf), file);
 163                         if (p)  {
 164                                 p = strchr(buf, '\n');
 165                                 if (p)
 166                                         *p = '\0';
 167                                 p = strdup(buf);
 168                                 if (p)
 169                                         os_minor = p;
 170                         }
 171                 }
 172         }
 173
 174 done:
 175         fclose(file);
 176         return;
 177 }
 178
 179 static int
 180 kvp_get_ip_address(int family, char *buffer, int length)
 181 {
 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;
 186         int offset = 0;
 187         const char *str;
 188         char tmp[50];
 189         int error = 0;
 190
 191         /*
 192          * On entry into this function, the buffer is capable of holding the
 193          * maximum key value (2048 bytes).
 194          */
 195
 196         if (getifaddrs(&ifap)) {
 197                 strcpy(buffer, "getifaddrs failed\n");
 198                 return 1;
 199         }
 200
 201         curp = ifap;
 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;
 208
 209                                 str = inet_ntop(family, &addr->sin_addr,
 210                                                 tmp, 50);
 211                                 if (str == NULL) {
 212                                         strcpy(buffer, "inet_ntop failed\n");
 213                                         error = 1;
 214                                         goto getaddr_done;
 215                                 }
 216                                 if (offset == 0)
 217                                         strcpy(buffer, tmp);
 218                                 else
 219                                         strcat(buffer, tmp);
 220                                 strcat(buffer, ";");
 221
 222                                 offset += strlen(str) + 1;
 223                                 if ((length - offset) < (ipv4_len + 1))
 224                                         goto getaddr_done;
 225
 226                         } else {
 227
 228                         /*
 229                          * We only support AF_INET and AF_INET6
 230                          * and the list of addresses is separated by a ";".
 231                          */
 232                                 struct sockaddr_in6 *addr =
 233                                 (struct sockaddr_in6 *) curp->ifa_addr;
 234
 235                                 str = inet_ntop(family,
 236                                         &addr->sin6_addr.s6_addr,
 237                                         tmp, 50);
 238                                 if (str == NULL) {
 239                                         strcpy(buffer, "inet_ntop failed\n");
 240                                         error = 1;
 241                                         goto getaddr_done;
 242                                 }
 243                                 if (offset == 0)
 244                                         strcpy(buffer, tmp);
 245                                 else
 246                                         strcat(buffer, tmp);
 247                                 strcat(buffer, ";");
 248                                 offset += strlen(str) + 1;
 249                                 if ((length - offset) < (ipv6_len + 1))
 250                                         goto getaddr_done;
 251
 252                         }
 253
 254                 }
 255                 curp = curp->ifa_next;
 256         }
 257
 258 getaddr_done:
 259         freeifaddrs(ifap);
 260         return error;
 261 }
 262
 263
 264 static int
 265 kvp_get_domain_name(char *buffer, int length)
 266 {
 267         struct addrinfo hints, *info ;
 268         gethostname(buffer, length);
 269         int error = 0;
 270
 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;
 275
 276         error = getaddrinfo(buffer, "http", &hints, &info);
 277         if (error != 0) {
 278                 strcpy(buffer, "getaddrinfo failed\n");
 279                 error = 1;
 280                 goto get_domain_done;
 281         }
 282         strcpy(buffer, info->ai_canonname);
 283 get_domain_done:
 284         freeaddrinfo(info);
 285         return error;
 286 }
 287
 288 static int
 289 netlink_send(int fd, struct cn_msg *msg)
 290 {
 291         struct nlmsghdr *nlh;
 292         unsigned int size;
 293         struct msghdr message;
 294         char buffer[64];
 295         struct iovec iov[2];
 296
 297         size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
 298
 299         nlh = (struct nlmsghdr *)buffer;
 300         nlh->nlmsg_seq = 0;
 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;
 305
 306         iov[0].iov_base = nlh;
 307         iov[0].iov_len = sizeof(*nlh);
 308
 309         iov[1].iov_base = msg;
 310         iov[1].iov_len = size;
 311
 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;
 317
 318         return sendmsg(fd, &message, 0);
 319 }
 320
 321 int main(void)
 322 {
 323         int fd, len, sock_opt;
 324         int error;
 325         struct cn_msg *message;
 326         struct pollfd pfd;
 327         struct nlmsghdr *incoming_msg;
 328         struct cn_msg   *incoming_cn_msg;
 329         struct hv_ku_msg *hv_msg;
 330         char    *p;
 331         char    *key_value;
 332         char    *key_name;
 333
 334         daemon(1, 0);
 335         openlog("KVP", 0, LOG_USER);
 336         syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 337         /*
 338          * Retrieve OS release information.
 339          */
 340         kvp_get_os_info();
 341
 342         fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 343         if (fd < 0) {
 344                 syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
 345                 exit(-1);
 346         }
 347         addr.nl_family = AF_NETLINK;
 348         addr.nl_pad = 0;
 349         addr.nl_pid = 0;
 350         addr.nl_groups = CN_KVP_IDX;
 351
 352
 353         error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
 354         if (error < 0) {
 355                 syslog(LOG_ERR, "bind failed; error:%d", error);
 356                 close(fd);
 357                 exit(-1);
 358         }
 359         sock_opt = addr.nl_groups;
 360         setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
 361         /*
 362          * Register ourselves with the kernel.
 363          */
 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;
 368         message->ack = 0;
 369         message->len = 0;
 370
 371         len = netlink_send(fd, message);
 372         if (len < 0) {
 373                 syslog(LOG_ERR, "netlink_send failed; error:%d", len);
 374                 close(fd);
 375                 exit(-1);
 376         }
 377
 378         pfd.fd = fd;
 379
 380         while (1) {
 381                 pfd.events = POLLIN;
 382                 pfd.revents = 0;
 383                 poll(&pfd, 1, -1);
 384
 385                 len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
 386
 387                 if (len < 0) {
 388                         syslog(LOG_ERR, "recv failed; error:%d", len);
 389                         close(fd);
 390                         return -1;
 391                 }
 392
 393                 incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
 394                 incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
 395
 396                 switch (incoming_cn_msg->seq) {
 397                 case KVP_REGISTER:
 398                         /*
 399                          * Driver is registering with us; stash away the version
 400                          * information.
 401                          */
 402                         p = (char *)incoming_cn_msg->data;
 403                         lic_version = malloc(strlen(p) + 1);
 404                         if (lic_version) {
 405                                 strcpy(lic_version, p);
 406                                 syslog(LOG_INFO, "KVP LIC Version: %s",
 407                                         lic_version);
 408                         } else {
 409                                 syslog(LOG_ERR, "malloc failed");
 410                         }
 411                         continue;
 412
 413                 case KVP_KERNEL_GET:
 414                         break;
 415                 default:
 416                         continue;
 417                 }
 418
 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;
 422
 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");
 428                         break;
 429                 case IntegrationServicesVersion:
 430                         strcpy(key_name, "IntegrationServicesVersion");
 431                         strcpy(key_value, lic_version);
 432                         break;
 433                 case NetworkAddressIPv4:
 434                         kvp_get_ip_address(AF_INET, key_value,
 435                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 436                         strcpy(key_name, "NetworkAddressIPv4");
 437                         break;
 438                 case NetworkAddressIPv6:
 439                         kvp_get_ip_address(AF_INET6, key_value,
 440                                         HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
 441                         strcpy(key_name, "NetworkAddressIPv6");
 442                         break;
 443                 case OSBuildNumber:
 444                         strcpy(key_value, os_build);
 445                         strcpy(key_name, "OSBuildNumber");
 446                         break;
 447                 case OSName:
 448                         strcpy(key_value, os_name);
 449                         strcpy(key_name, "OSName");
 450                         break;
 451                 case OSMajorVersion:
 452                         strcpy(key_value, os_major);
 453                         strcpy(key_name, "OSMajorVersion");
 454                         break;
 455                 case OSMinorVersion:
 456                         strcpy(key_value, os_minor);
 457                         strcpy(key_name, "OSMinorVersion");
 458                         break;
 459                 case OSVersion:
 460                         strcpy(key_value, os_build);
 461                         strcpy(key_name, "OSVersion");
 462                         break;
 463                 case ProcessorArchitecture:
 464                         strcpy(key_value, processor_arch);
 465                         strcpy(key_name, "ProcessorArchitecture");
 466                         break;
 467                 default:
 468                         strcpy(key_value, "Unknown Key");
 469                         /*
 470                          * We use a null key name to terminate enumeration.
 471                          */
 472                         strcpy(key_name, "");
 473                         break;
 474                 }
 475                 /*
 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
 479                  */
 480
 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);
 486
 487                 len = netlink_send(fd, incoming_cn_msg);
 488                 if (len < 0) {
 489                         syslog(LOG_ERR, "net_link send failed; error:%d", len);
 490                         exit(-1);
 491                 }
 492         }
 493
 494 }