src/client/sock.c

   1 /*
   2  * SysDB - src/client/sock.c
   3  * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #if HAVE_CONFIG_H
  29 #       include "config.h"
  30 #endif /* HAVE_CONFIG_H */
  31
  32 #include "client/sock.h"
  33 #include "utils/error.h"
  34 #include "utils/strbuf.h"
  35 #include "utils/proto.h"
  36 #include "utils/os.h"
  37 #include "utils/ssl.h"
  38
  39 #include <arpa/inet.h>
  40
  41 #include <assert.h>
  42 #include <errno.h>
  43 #include <limits.h>
  44
  45 #include <stdlib.h>
  46
  47 #include <string.h>
  48 #include <strings.h>
  49
  50 #include <unistd.h>
  51
  52 #include <sys/socket.h>
  53 #include <sys/un.h>
  54
  55 #include <netdb.h>
  56
  57 /*
  58  * private data types
  59  */
  60
  61 struct sdb_client {
  62         char *address;
  63         int   fd;
  64         bool  eof;
  65
  66         /* optional SSL settings */
  67         sdb_ssl_options_t ssl_opts;
  68         sdb_ssl_client_t *ssl;
  69         sdb_ssl_session_t *ssl_session;
  70
  71         ssize_t (*read)(sdb_client_t *, sdb_strbuf_t *, size_t);
  72         ssize_t (*write)(sdb_client_t *, const void *, size_t);
  73 };
  74
  75 /*
  76  * private helper functions
  77  */
  78
  79 static ssize_t
  80 ssl_read(sdb_client_t *client, sdb_strbuf_t *buf, size_t n)
  81 {
  82         char tmp[n];
  83         ssize_t ret;
  84
  85         ret = sdb_ssl_session_read(client->ssl_session, tmp, n);
  86         if (ret <= 0)
  87                 return ret;
  88
  89         sdb_strbuf_memappend(buf, tmp, ret);
  90         return ret;
  91 } /* ssl_read */
  92
  93 static ssize_t
  94 ssl_write(sdb_client_t *client, const void *buf, size_t n)
  95 {
  96         return sdb_ssl_session_write(client->ssl_session, buf, n);
  97 } /* ssl_write */
  98
  99 static ssize_t
 100 client_read(sdb_client_t *client, sdb_strbuf_t *buf, size_t n)
 101 {
 102         return sdb_strbuf_read(buf, client->fd, n);
 103 } /* client_read */
 104
 105 static ssize_t
 106 client_write(sdb_client_t *client, const void *buf, size_t n)
 107 {
 108         return sdb_write(client->fd, n, buf);
 109 } /* client_write */
 110
 111 static int
 112 connect_unixsock(sdb_client_t *client, const char *address)
 113 {
 114         struct sockaddr_un sa;
 115
 116         client->fd = socket(AF_UNIX, SOCK_STREAM, /* protocol = */ 0);
 117         if (client->fd < 0) {
 118                 char errbuf[1024];
 119                 sdb_log(SDB_LOG_ERR, "Failed to open socket: %s",
 120                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 121                 return -1;
 122         }
 123
 124         sa.sun_family = AF_UNIX;
 125         strncpy(sa.sun_path, address, sizeof(sa.sun_path));
 126         sa.sun_path[sizeof(sa.sun_path) - 1] = '\0';
 127
 128         if (connect(client->fd, (struct sockaddr *)&sa, sizeof(sa))) {
 129                 char errbuf[1024];
 130                 sdb_client_close(client);
 131                 sdb_log(SDB_LOG_ERR, "Failed to connect to '%s': %s",
 132                                 sa.sun_path, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 133                 return -1;
 134         }
 135         return client->fd;
 136 } /* connect_unixsock */
 137
 138 static int
 139 connect_tcp(sdb_client_t *client, const char *address)
 140 {
 141         struct addrinfo *ai, *ai_list = NULL;
 142         int status;
 143
 144         if ((status = sdb_resolve(SDB_NET_TCP, address, &ai_list))) {
 145                 sdb_log(SDB_LOG_ERR, "Failed to resolve '%s': %s",
 146                                 address, gai_strerror(status));
 147                 return -1;
 148         }
 149
 150         for (ai = ai_list; ai != NULL; ai = ai->ai_next) {
 151                 client->fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 152                 if (client->fd < 0) {
 153                         char errbuf[1024];
 154                         sdb_log(SDB_LOG_ERR, "Failed to open socket: %s",
 155                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 156                         continue;
 157                 }
 158
 159                 if (connect(client->fd, ai->ai_addr, ai->ai_addrlen)) {
 160                         char host[1024], port[32], errbuf[1024];
 161                         sdb_client_close(client);
 162                         getnameinfo(ai->ai_addr, ai->ai_addrlen, host, sizeof(host),
 163                                         port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
 164                         sdb_log(SDB_LOG_ERR, "Failed to connect to '%s:%s': %s",
 165                                         host, port, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 166                         continue;
 167                 }
 168                 break;
 169         }
 170         freeaddrinfo(ai_list);
 171
 172         if (client->fd < 0)
 173                 return -1;
 174
 175         client->ssl = sdb_ssl_client_create(&client->ssl_opts);
 176         if (! client->ssl) {
 177                 sdb_client_close(client);
 178                 return -1;
 179         }
 180         client->ssl_session = sdb_ssl_client_connect(client->ssl, client->fd);
 181         if (! client->ssl_session) {
 182                 sdb_client_close(client);
 183                 return -1;
 184         }
 185
 186         client->read = ssl_read;
 187         client->write = ssl_write;
 188         return client->fd;
 189 } /* connect_tcp */
 190
 191 /*
 192  * public API
 193  */
 194
 195 sdb_client_t *
 196 sdb_client_create(const char *address)
 197 {
 198         sdb_client_t *client;
 199
 200         if (! address)
 201                 return NULL;
 202
 203         client = malloc(sizeof(*client));
 204         if (! client) {
 205                 sdb_log(SDB_LOG_ERR, "Out of memory");
 206                 return NULL;
 207         }
 208         memset(client, 0, sizeof(*client));
 209         client->fd = -1;
 210         client->eof = 1;
 211
 212         client->ssl = NULL;
 213         client->read = client_read;
 214         client->write = client_write;
 215
 216         client->address = strdup(address);
 217         if (! client->address) {
 218                 sdb_client_destroy(client);
 219                 sdb_log(SDB_LOG_ERR, "Out of memory");
 220                 return NULL;
 221         }
 222
 223         return client;
 224 } /* sdb_client_create */
 225
 226 void
 227 sdb_client_destroy(sdb_client_t *client)
 228 {
 229         if (! client)
 230                 return;
 231
 232         sdb_client_close(client);
 233
 234         if (client->address)
 235                 free(client->address);
 236         client->address = NULL;
 237
 238         sdb_ssl_free_options(&client->ssl_opts);
 239
 240         free(client);
 241 } /* sdb_client_destroy */
 242
 243 int
 244 sdb_client_set_ssl_options(sdb_client_t *client, const sdb_ssl_options_t *opts)
 245 {
 246         int ret = 0;
 247
 248         if ((! client) || (! opts))
 249                 return -1;
 250
 251         sdb_ssl_free_options(&client->ssl_opts);
 252
 253         if (opts->ca_file) {
 254                 client->ssl_opts.ca_file = strdup(opts->ca_file);
 255                 if (! client->ssl_opts.ca_file)
 256                         ret = -1;
 257         }
 258         if (opts->key_file) {
 259                 client->ssl_opts.key_file = strdup(opts->key_file);
 260                 if (! client->ssl_opts.key_file)
 261                         ret = -1;
 262         }
 263         if (opts->cert_file) {
 264                 client->ssl_opts.cert_file = strdup(opts->cert_file);
 265                 if (! client->ssl_opts.cert_file)
 266                         ret = -1;
 267         }
 268         if (opts->crl_file) {
 269                 client->ssl_opts.crl_file = strdup(opts->crl_file);
 270                 if (! client->ssl_opts.crl_file)
 271                         ret = -1;
 272         }
 273
 274         if (ret)
 275                 sdb_ssl_free_options(&client->ssl_opts);
 276         return ret;
 277 } /* sdb_client_set_ssl_options */
 278
 279 int
 280 sdb_client_connect(sdb_client_t *client, const char *username)
 281 {
 282         sdb_strbuf_t *buf;
 283         ssize_t status;
 284         uint32_t rstatus;
 285
 286         if ((! client) || (! client->address))
 287                 return -1;
 288
 289         if (client->fd >= 0)
 290                 return -1;
 291
 292         if (*client->address == '/')
 293                 connect_unixsock(client, client->address);
 294         else if (!strncasecmp(client->address, "unix:", strlen("unix:")))
 295                 connect_unixsock(client, client->address + strlen("unix:"));
 296         else if (!strncasecmp(client->address, "tcp:", strlen("tcp:")))
 297                 connect_tcp(client, client->address + strlen("tcp:"));
 298         else
 299                 connect_tcp(client, client->address);
 300
 301         if (client->fd < 0)
 302                 return -1;
 303         client->eof = 0;
 304
 305         /* XXX */
 306         if (! username)
 307                 username = "";
 308
 309         buf = sdb_strbuf_create(64);
 310         rstatus = 0;
 311         status = sdb_client_rpc(client, SDB_CONNECTION_STARTUP,
 312                         (uint32_t)strlen(username), username, &rstatus, buf);
 313         if ((status >= 0) && (rstatus == SDB_CONNECTION_OK)) {
 314                 sdb_strbuf_destroy(buf);
 315                 return 0;
 316         }
 317
 318         if (status < 0) {
 319                 sdb_log(SDB_LOG_ERR, "%s", sdb_strbuf_string(buf));
 320                 sdb_client_close(client);
 321                 sdb_strbuf_destroy(buf);
 322                 return (int)status;
 323         }
 324         if (client->eof)
 325                 sdb_log(SDB_LOG_ERR, "Encountered end-of-file while waiting "
 326                                 "for server response");
 327
 328         if (rstatus == SDB_CONNECTION_ERROR) {
 329                 sdb_log(SDB_LOG_ERR, "Access denied for user '%s': %s",
 330                                 username, sdb_strbuf_string(buf));
 331                 status = -((int)rstatus);
 332         }
 333         else if (rstatus != SDB_CONNECTION_OK) {
 334                 sdb_log(SDB_LOG_ERR, "Received unsupported authentication request "
 335                                 "(status %d) during startup", (int)rstatus);
 336                 status = -((int)rstatus);
 337         }
 338
 339         sdb_client_close(client);
 340         sdb_strbuf_destroy(buf);
 341         return (int)status;
 342 } /* sdb_client_connect */
 343
 344 int
 345 sdb_client_sockfd(sdb_client_t *client)
 346 {
 347         if (! client)
 348                 return -1;
 349         return client->fd;
 350 } /* sdb_client_sockfd */
 351
 352 int
 353 sdb_client_shutdown(sdb_client_t *client, int how)
 354 {
 355         if (! client) {
 356                 errno = ENOTSOCK;
 357                 return -1;
 358         }
 359
 360         if (client->fd < 0) {
 361                 errno = EBADF;
 362                 return -1;
 363         }
 364
 365         return shutdown(client->fd, how);
 366 } /* sdb_client_shutdown */
 367
 368 void
 369 sdb_client_close(sdb_client_t *client)
 370 {
 371         if (! client)
 372                 return;
 373
 374         if (client->ssl_session) {
 375                 sdb_ssl_session_destroy(client->ssl_session);
 376                 client->ssl_session = NULL;
 377         }
 378         if (client->ssl) {
 379                 sdb_ssl_client_destroy(client->ssl);
 380                 client->ssl = NULL;
 381         }
 382
 383         close(client->fd);
 384         client->fd = -1;
 385         client->eof = 1;
 386 } /* sdb_client_close */
 387
 388 ssize_t
 389 sdb_client_rpc(sdb_client_t *client,
 390                 uint32_t cmd, uint32_t msg_len, const char *msg,
 391                 uint32_t *code, sdb_strbuf_t *buf)
 392 {
 393         uint32_t rcode = 0;
 394         ssize_t status;
 395
 396         if (! buf)
 397                 return -1;
 398
 399         if (sdb_client_send(client, cmd, msg_len, msg) < 0) {
 400                 char errbuf[1024];
 401                 sdb_strbuf_sprintf(buf, "Failed to send %s message to server: %s",
 402                                 SDB_CONN_MSGTYPE_TO_STRING(cmd),
 403                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 404                 if (code)
 405                         *code = SDB_CONNECTION_ERROR;
 406                 return -1;
 407         }
 408
 409         while (42) {
 410                 size_t offset = sdb_strbuf_len(buf);
 411
 412                 status = sdb_client_recv(client, &rcode, buf);
 413                 if (status < 0) {
 414                         char errbuf[1024];
 415                         sdb_strbuf_sprintf(buf, "Failed to receive server response: %s",
 416                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 417                         if (code)
 418                                 *code = SDB_CONNECTION_ERROR;
 419                         return status;
 420                 }
 421
 422                 if (rcode == SDB_CONNECTION_LOG) {
 423                         uint32_t prio = 0;
 424                         if (sdb_proto_unmarshal_int32(SDB_STRBUF_STR(buf), &prio) < 0) {
 425                                 sdb_log(SDB_LOG_WARNING, "Received a LOG message "
 426                                                 "with invalid or missing priority");
 427                                 prio = (uint32_t)SDB_LOG_ERR;
 428                         }
 429                         sdb_log((int)prio, "%s", sdb_strbuf_string(buf) + offset);
 430                         sdb_strbuf_skip(buf, offset, sdb_strbuf_len(buf) - offset);
 431                         continue;
 432                 }
 433                 break;
 434         }
 435
 436         if (code)
 437                 *code = rcode;
 438         return status;
 439 } /* sdb_client_rpc */
 440
 441 ssize_t
 442 sdb_client_send(sdb_client_t *client,
 443                 uint32_t cmd, uint32_t msg_len, const char *msg)
 444 {
 445         char buf[2 * sizeof(uint32_t) + msg_len];
 446
 447         if ((! client) || (! client->fd))
 448                 return -1;
 449         if (sdb_proto_marshal(buf, sizeof(buf), cmd, msg_len, msg) < 0)
 450                 return -1;
 451
 452         return client->write(client, buf, sizeof(buf));
 453 } /* sdb_client_send */
 454
 455 ssize_t
 456 sdb_client_recv(sdb_client_t *client,
 457                 uint32_t *code, sdb_strbuf_t *buf)
 458 {
 459         uint32_t rstatus = UINT32_MAX;
 460         uint32_t rlen = UINT32_MAX;
 461
 462         size_t total = 0;
 463         size_t req = 2 * sizeof(uint32_t);
 464
 465         size_t data_offset = sdb_strbuf_len(buf);
 466
 467         if (code)
 468                 *code = UINT32_MAX;
 469
 470         if ((! client) || (! client->fd) || (! buf)) {
 471                 errno = EBADF;
 472                 return -1;
 473         }
 474
 475         while (42) {
 476                 ssize_t status;
 477
 478                 errno = 0;
 479                 status = client->read(client, buf, req);
 480                 if (status < 0) {
 481                         if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
 482                                 continue;
 483                         return status;
 484                 }
 485                 else if (! status) {
 486                         client->eof = 1;
 487                         break;
 488                 }
 489
 490                 total += (size_t)status;
 491
 492                 if (total != req)
 493                         continue;
 494
 495                 if (rstatus == UINT32_MAX) {
 496                         const char *str = sdb_strbuf_string(buf) + data_offset;
 497                         size_t len = sdb_strbuf_len(buf) - data_offset;
 498                         ssize_t n;
 499
 500                         /* retrieve status and data len */
 501                         assert(len >= 2 * sizeof(uint32_t));
 502                         n = sdb_proto_unmarshal_int32(str, len, &rstatus);
 503                         str += n; len -= (size_t)n;
 504                         sdb_proto_unmarshal_int32(str, len, &rlen);
 505
 506                         if (! rlen)
 507                                 break;
 508
 509                         req = (size_t)rlen;
 510                         total = 0;
 511                 }
 512                 else /* finished reading data */
 513                         break;
 514         }
 515
 516         if (total != req) {
 517                 /* unexpected EOF; clear partially read data */
 518                 sdb_strbuf_skip(buf, data_offset, sdb_strbuf_len(buf));
 519                 return 0;
 520         }
 521
 522         if (rstatus != UINT32_MAX)
 523                 /* remove status,len */
 524                 sdb_strbuf_skip(buf, data_offset, 2 * sizeof(rstatus));
 525
 526         if (code)
 527                 *code = rstatus;
 528
 529         return (ssize_t)total;
 530 } /* sdb_client_recv */
 531
 532 bool
 533 sdb_client_eof(sdb_client_t *client)
 534 {
 535         if ((! client) || (client->fd < 0))
 536                 return 1;
 537         return client->eof;
 538 } /* sdb_client_eof */
 539
 540 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 541