sbin/ggate/ggated/ggated.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/bio.h>
  33 #include <sys/disk.h>
  34 #include <sys/endian.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/queue.h>
  37 #include <sys/socket.h>
  38 #include <sys/stat.h>
  39 #include <sys/time.h>
  40 #include <arpa/inet.h>
  41 #include <netinet/in.h>
  42 #include <netinet/tcp.h>
  43 #include <assert.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <libgen.h>
  48 #include <libutil.h>
  49 #include <paths.h>
  50 #include <pthread.h>
  51 #include <signal.h>
  52 #include <stdarg.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <stdint.h>
  56 #include <string.h>
  57 #include <syslog.h>
  58 #include <unistd.h>
  59
  60 #include "ggate.h"
  61
  62
  63 #define GGATED_EXPORT_FILE      "/etc/gg.exports"
  64
  65 struct ggd_connection {
  66         off_t            c_mediasize;
  67         unsigned         c_sectorsize;
  68         unsigned         c_flags;       /* flags (RO/RW) */
  69         int              c_diskfd;
  70         int              c_sendfd;
  71         int              c_recvfd;
  72         time_t           c_birthtime;
  73         char            *c_path;
  74         uint64_t         c_token;
  75         in_addr_t        c_srcip;
  76         LIST_ENTRY(ggd_connection) c_next;
  77 };
  78
  79 struct ggd_request {
  80         struct g_gate_hdr        r_hdr;
  81         char                    *r_data;
  82         TAILQ_ENTRY(ggd_request) r_next;
  83 };
  84 #define r_cmd           r_hdr.gh_cmd
  85 #define r_offset        r_hdr.gh_offset
  86 #define r_length        r_hdr.gh_length
  87 #define r_error         r_hdr.gh_error
  88
  89 struct ggd_export {
  90         char            *e_path;        /* path to device/file */
  91         in_addr_t        e_ip;          /* remote IP address */
  92         in_addr_t        e_mask;        /* IP mask */
  93         unsigned         e_flags;       /* flags (RO/RW) */
  94         SLIST_ENTRY(ggd_export) e_next;
  95 };
  96
  97 static const char *exports_file = GGATED_EXPORT_FILE;
  98 static int got_sighup = 0;
  99 static in_addr_t bindaddr;
 100
 101 static TAILQ_HEAD(, ggd_request) inqueue = TAILQ_HEAD_INITIALIZER(inqueue);
 102 static TAILQ_HEAD(, ggd_request) outqueue = TAILQ_HEAD_INITIALIZER(outqueue);
 103 static pthread_mutex_t inqueue_mtx, outqueue_mtx;
 104 static pthread_cond_t inqueue_cond, outqueue_cond;
 105
 106 static SLIST_HEAD(, ggd_export) exports = SLIST_HEAD_INITIALIZER(exports);
 107 static LIST_HEAD(, ggd_connection) connections = LIST_HEAD_INITIALIZER(connections);
 108
 109 static void *recv_thread(void *arg);
 110 static void *disk_thread(void *arg);
 111 static void *send_thread(void *arg);
 112
 113 static void
 114 usage(void)
 115 {
 116
 117         fprintf(stderr, "usage: %s [-nv] [-a address] [-F pidfile] [-p port] "
 118             "[-R rcvbuf] [-S sndbuf] [exports file]\n", getprogname());
 119         exit(EXIT_FAILURE);
 120 }
 121
 122 static char *
 123 ip2str(in_addr_t ip)
 124 {
 125         static char sip[16];
 126
 127         snprintf(sip, sizeof(sip), "%u.%u.%u.%u",
 128             ((ip >> 24) & 0xff),
 129             ((ip >> 16) & 0xff),
 130             ((ip >> 8) & 0xff),
 131             (ip & 0xff));
 132         return (sip);
 133 }
 134
 135 static in_addr_t
 136 countmask(unsigned m)
 137 {
 138         in_addr_t mask;
 139
 140         if (m == 0) {
 141                 mask = 0x0;
 142         } else {
 143                 mask = 1 << (32 - m);
 144                 mask--;
 145                 mask = ~mask;
 146         }
 147         return (mask);
 148 }
 149
 150 static void
 151 line_parse(char *line, unsigned lineno)
 152 {
 153         struct ggd_export *ex;
 154         char *word, *path, *sflags;
 155         unsigned flags, i, vmask;
 156         in_addr_t ip, mask;
 157
 158         ip = mask = flags = vmask = 0;
 159         path = NULL;
 160         sflags = NULL;
 161
 162         for (i = 0, word = strtok(line, " \t"); word != NULL;
 163             i++, word = strtok(NULL, " \t")) {
 164                 switch (i) {
 165                 case 0: /* IP address or host name */
 166                         ip = g_gate_str2ip(strsep(&word, "/"));
 167                         if (ip == INADDR_NONE) {
 168                                 g_gate_xlog("Invalid IP/host name at line %u.",
 169                                     lineno);
 170                         }
 171                         ip = ntohl(ip);
 172                         if (word == NULL)
 173                                 vmask = 32;
 174                         else {
 175                                 errno = 0;
 176                                 vmask = strtoul(word, NULL, 10);
 177                                 if (vmask == 0 && errno != 0) {
 178                                         g_gate_xlog("Invalid IP mask value at "
 179                                             "line %u.", lineno);
 180                                 }
 181                                 if ((unsigned)vmask > 32) {
 182                                         g_gate_xlog("Invalid IP mask value at line %u.",
 183                                             lineno);
 184                                 }
 185                         }
 186                         mask = countmask(vmask);
 187                         break;
 188                 case 1: /* flags */
 189                         if (strcasecmp("rd", word) == 0 ||
 190                             strcasecmp("ro", word) == 0) {
 191                                 flags = O_RDONLY;
 192                         } else if (strcasecmp("wo", word) == 0) {
 193                                 flags = O_WRONLY;
 194                         } else if (strcasecmp("rw", word) == 0) {
 195                                 flags = O_RDWR;
 196                         } else {
 197                                 g_gate_xlog("Invalid value in flags field at "
 198                                     "line %u.", lineno);
 199                         }
 200                         sflags = word;
 201                         break;
 202                 case 2: /* path */
 203                         if (strlen(word) >= MAXPATHLEN) {
 204                                 g_gate_xlog("Path too long at line %u. ",
 205                                     lineno);
 206                         }
 207                         path = word;
 208                         break;
 209                 default:
 210                         g_gate_xlog("Too many arguments at line %u. ", lineno);
 211                 }
 212         }
 213         if (i != 3)
 214                 g_gate_xlog("Too few arguments at line %u.", lineno);
 215
 216         ex = malloc(sizeof(*ex));
 217         if (ex == NULL)
 218                 g_gate_xlog("Not enough memory.");
 219         ex->e_path = strdup(path);
 220         if (ex->e_path == NULL)
 221                 g_gate_xlog("Not enough memory.");
 222
 223         /* Made 'and' here. */
 224         ex->e_ip = (ip & mask);
 225         ex->e_mask = mask;
 226         ex->e_flags = flags;
 227
 228         SLIST_INSERT_HEAD(&exports, ex, e_next);
 229
 230         g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.",
 231             ip2str(ex->e_ip), vmask, path, sflags);
 232 }
 233
 234 static void
 235 exports_clear(void)
 236 {
 237         struct ggd_export *ex;
 238
 239         while (!SLIST_EMPTY(&exports)) {
 240                 ex = SLIST_FIRST(&exports);
 241                 SLIST_REMOVE_HEAD(&exports, e_next);
 242                 free(ex);
 243         }
 244 }
 245
 246 #define EXPORTS_LINE_SIZE       2048
 247 static void
 248 exports_get(void)
 249 {
 250         char buf[EXPORTS_LINE_SIZE], *line;
 251         unsigned lineno = 0, objs = 0, len;
 252         FILE *fd;
 253
 254         exports_clear();
 255
 256         fd = fopen(exports_file, "r");
 257         if (fd == NULL) {
 258                 g_gate_xlog("Cannot open exports file (%s): %s.", exports_file,
 259                     strerror(errno));
 260         }
 261
 262         g_gate_log(LOG_INFO, "Reading exports file (%s).", exports_file);
 263
 264         for (;;) {
 265                 if (fgets(buf, sizeof(buf), fd) == NULL) {
 266                         if (feof(fd))
 267                                 break;
 268
 269                         g_gate_xlog("Error while reading exports file: %s.",
 270                             strerror(errno));
 271                 }
 272
 273                 /* Increase line count. */
 274                 lineno++;
 275
 276                 /* Skip spaces and tabs. */
 277                 for (line = buf; *line == ' ' || *line == '\t'; ++line)
 278                         ;
 279
 280                 /* Empty line, comment or empty line at the end of file. */
 281                 if (*line == '\n' || *line == '#' || *line == '\0')
 282                         continue;
 283
 284                 len = strlen(line);
 285                 if (line[len - 1] == '\n') {
 286                         /* Remove new line char. */
 287                         line[len - 1] = '\0';
 288                 } else {
 289                         if (!feof(fd))
 290                                 g_gate_xlog("Line %u too long.", lineno);
 291                 }
 292
 293                 line_parse(line, lineno);
 294                 objs++;
 295         }
 296
 297         fclose(fd);
 298
 299         if (objs == 0)
 300                 g_gate_xlog("There are no objects to export.");
 301
 302         g_gate_log(LOG_INFO, "Exporting %u object(s).", objs);
 303 }
 304
 305 static int
 306 exports_check(struct ggd_export *ex, struct g_gate_cinit *cinit,
 307     struct ggd_connection *conn)
 308 {
 309         char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */
 310         int error = 0, flags;
 311
 312         strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask));
 313         strlcat(ipmask, "/", sizeof(ipmask));
 314         strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask));
 315         if ((cinit->gc_flags & GGATE_FLAG_RDONLY) != 0) {
 316                 if (ex->e_flags == O_WRONLY) {
 317                         g_gate_log(LOG_WARNING, "Read-only access requested, "
 318                             "but %s (%s) is exported write-only.", ex->e_path,
 319                             ipmask);
 320                         return (EPERM);
 321                 } else {
 322                         conn->c_flags |= GGATE_FLAG_RDONLY;
 323                 }
 324         } else if ((cinit->gc_flags & GGATE_FLAG_WRONLY) != 0) {
 325                 if (ex->e_flags == O_RDONLY) {
 326                         g_gate_log(LOG_WARNING, "Write-only access requested, "
 327                             "but %s (%s) is exported read-only.", ex->e_path,
 328                             ipmask);
 329                         return (EPERM);
 330                 } else {
 331                         conn->c_flags |= GGATE_FLAG_WRONLY;
 332                 }
 333         } else {
 334                 if (ex->e_flags == O_RDONLY) {
 335                         g_gate_log(LOG_WARNING, "Read-write access requested, "
 336                             "but %s (%s) is exported read-only.", ex->e_path,
 337                             ipmask);
 338                         return (EPERM);
 339                 } else if (ex->e_flags == O_WRONLY) {
 340                         g_gate_log(LOG_WARNING, "Read-write access requested, "
 341                             "but %s (%s) is exported write-only.", ex->e_path,
 342                             ipmask);
 343                         return (EPERM);
 344                 }
 345         }
 346         if ((conn->c_flags & GGATE_FLAG_RDONLY) != 0)
 347                 flags = O_RDONLY;
 348         else if ((conn->c_flags & GGATE_FLAG_WRONLY) != 0)
 349                 flags = O_WRONLY;
 350         else
 351                 flags = O_RDWR;
 352         conn->c_diskfd = open(ex->e_path, flags);
 353         if (conn->c_diskfd == -1) {
 354                 error = errno;
 355                 g_gate_log(LOG_ERR, "Cannot open %s: %s.", ex->e_path,
 356                     strerror(error));
 357                 return (error);
 358         }
 359         return (0);
 360 }
 361
 362 static struct ggd_export *
 363 exports_find(struct sockaddr *s, struct g_gate_cinit *cinit,
 364     struct ggd_connection *conn)
 365 {
 366         struct ggd_export *ex;
 367         in_addr_t ip;
 368         int error;
 369
 370         ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
 371         SLIST_FOREACH(ex, &exports, e_next) {
 372                 if ((ip & ex->e_mask) != ex->e_ip) {
 373                         g_gate_log(LOG_DEBUG, "exports[%s]: IP mismatch.",
 374                             ex->e_path);
 375                         continue;
 376                 }
 377                 if (strcmp(cinit->gc_path, ex->e_path) != 0) {
 378                         g_gate_log(LOG_DEBUG, "exports[%s]: Path mismatch.",
 379                             ex->e_path);
 380                         continue;
 381                 }
 382                 error = exports_check(ex, cinit, conn);
 383                 if (error == 0)
 384                         return (ex);
 385                 else {
 386                         errno = error;
 387                         return (NULL);
 388                 }
 389         }
 390         g_gate_log(LOG_WARNING, "Unauthorized connection from: %s.",
 391             ip2str(ip));
 392         errno = EPERM;
 393         return (NULL);
 394 }
 395
 396 /*
 397  * Remove timed out connections.
 398  */
 399 static void
 400 connection_cleanups(void)
 401 {
 402         struct ggd_connection *conn, *tconn;
 403         time_t now;
 404
 405         time(&now);
 406         LIST_FOREACH_SAFE(conn, &connections, c_next, tconn) {
 407                 if (now - conn->c_birthtime > 10) {
 408                         LIST_REMOVE(conn, c_next);
 409                         g_gate_log(LOG_NOTICE,
 410                             "Connection from %s [%s] removed.",
 411                             ip2str(conn->c_srcip), conn->c_path);
 412                         close(conn->c_diskfd);
 413                         close(conn->c_sendfd);
 414                         close(conn->c_recvfd);
 415                         free(conn->c_path);
 416                         free(conn);
 417                 }
 418         }
 419 }
 420
 421 static struct ggd_connection *
 422 connection_find(struct g_gate_cinit *cinit)
 423 {
 424         struct ggd_connection *conn;
 425
 426         LIST_FOREACH(conn, &connections, c_next) {
 427                 if (conn->c_token == cinit->gc_token)
 428                         break;
 429         }
 430         return (conn);
 431 }
 432
 433 static struct ggd_connection *
 434 connection_new(struct g_gate_cinit *cinit, struct sockaddr *s, int sfd)
 435 {
 436         struct ggd_connection *conn;
 437         in_addr_t ip;
 438
 439         /*
 440          * First, look for old connections.
 441          * We probably should do it every X seconds, but what for?
 442          * It is only dangerous if an attacker wants to overload connections
 443          * queue, so here is a good place to do the cleanups.
 444          */
 445         connection_cleanups();
 446
 447         conn = malloc(sizeof(*conn));
 448         if (conn == NULL)
 449                 return (NULL);
 450         conn->c_path = strdup(cinit->gc_path);
 451         if (conn->c_path == NULL) {
 452                 free(conn);
 453                 return (NULL);
 454         }
 455         conn->c_token = cinit->gc_token;
 456         ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
 457         conn->c_srcip = ip;
 458         conn->c_sendfd = conn->c_recvfd = -1;
 459         if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0)
 460                 conn->c_sendfd = sfd;
 461         else
 462                 conn->c_recvfd = sfd;
 463         conn->c_mediasize = 0;
 464         conn->c_sectorsize = 0;
 465         time(&conn->c_birthtime);
 466         conn->c_flags = cinit->gc_flags;
 467         LIST_INSERT_HEAD(&connections, conn, c_next);
 468         g_gate_log(LOG_DEBUG, "Connection created [%s, %s].", ip2str(ip),
 469             conn->c_path);
 470         return (conn);
 471 }
 472
 473 static int
 474 connection_add(struct ggd_connection *conn, struct g_gate_cinit *cinit,
 475     struct sockaddr *s, int sfd)
 476 {
 477         in_addr_t ip;
 478
 479         ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
 480         if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) {
 481                 if (conn->c_sendfd != -1) {
 482                         g_gate_log(LOG_WARNING,
 483                             "Send socket already exists [%s, %s].", ip2str(ip),
 484                             conn->c_path);
 485                         return (EEXIST);
 486                 }
 487                 conn->c_sendfd = sfd;
 488         } else {
 489                 if (conn->c_recvfd != -1) {
 490                         g_gate_log(LOG_WARNING,
 491                             "Receive socket already exists [%s, %s].",
 492                             ip2str(ip), conn->c_path);
 493                         return (EEXIST);
 494                 }
 495                 conn->c_recvfd = sfd;
 496         }
 497         g_gate_log(LOG_DEBUG, "Connection added [%s, %s].", ip2str(ip),
 498             conn->c_path);
 499         return (0);
 500 }
 501
 502 /*
 503  * Remove one socket from the given connection or the whole
 504  * connection if sfd == -1.
 505  */
 506 static void
 507 connection_remove(struct ggd_connection *conn)
 508 {
 509
 510         LIST_REMOVE(conn, c_next);
 511         g_gate_log(LOG_DEBUG, "Connection removed [%s %s].",
 512             ip2str(conn->c_srcip), conn->c_path);
 513         if (conn->c_sendfd != -1)
 514                 close(conn->c_sendfd);
 515         if (conn->c_recvfd != -1)
 516                 close(conn->c_recvfd);
 517         free(conn->c_path);
 518         free(conn);
 519 }
 520
 521 static int
 522 connection_ready(struct ggd_connection *conn)
 523 {
 524
 525         return (conn->c_sendfd != -1 && conn->c_recvfd != -1);
 526 }
 527
 528 static void
 529 connection_launch(struct ggd_connection *conn)
 530 {
 531         pthread_t td;
 532         int error, pid;
 533
 534         pid = fork();
 535         if (pid > 0)
 536                 return;
 537         else if (pid == -1) {
 538                 g_gate_log(LOG_ERR, "Cannot fork: %s.", strerror(errno));
 539                 return;
 540         }
 541         g_gate_log(LOG_DEBUG, "Process created [%s].", conn->c_path);
 542
 543         /*
 544          * Create condition variables and mutexes for in-queue and out-queue
 545          * synchronization.
 546          */
 547         error = pthread_mutex_init(&inqueue_mtx, NULL);
 548         if (error != 0) {
 549                 g_gate_xlog("pthread_mutex_init(inqueue_mtx): %s.",
 550                     strerror(error));
 551         }
 552         error = pthread_cond_init(&inqueue_cond, NULL);
 553         if (error != 0) {
 554                 g_gate_xlog("pthread_cond_init(inqueue_cond): %s.",
 555                     strerror(error));
 556         }
 557         error = pthread_mutex_init(&outqueue_mtx, NULL);
 558         if (error != 0) {
 559                 g_gate_xlog("pthread_mutex_init(outqueue_mtx): %s.",
 560                     strerror(error));
 561         }
 562         error = pthread_cond_init(&outqueue_cond, NULL);
 563         if (error != 0) {
 564                 g_gate_xlog("pthread_cond_init(outqueue_cond): %s.",
 565                     strerror(error));
 566         }
 567
 568         /*
 569          * Create threads:
 570          * recvtd - thread for receiving I/O request
 571          * diskio - thread for doing I/O request
 572          * sendtd - thread for sending I/O requests back
 573          */
 574         error = pthread_create(&td, NULL, send_thread, conn);
 575         if (error != 0) {
 576                 g_gate_xlog("pthread_create(send_thread): %s.",
 577                     strerror(error));
 578         }
 579         error = pthread_create(&td, NULL, recv_thread, conn);
 580         if (error != 0) {
 581                 g_gate_xlog("pthread_create(recv_thread): %s.",
 582                     strerror(error));
 583         }
 584         disk_thread(conn);
 585 }
 586
 587 static void
 588 sendfail(int sfd, int error, const char *fmt, ...)
 589 {
 590         struct g_gate_sinit sinit;
 591         va_list ap;
 592         ssize_t data;
 593
 594         sinit.gs_error = error;
 595         g_gate_swap2n_sinit(&sinit);
 596         data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
 597         g_gate_swap2h_sinit(&sinit);
 598         if (data != sizeof(sinit)) {
 599                 g_gate_log(LOG_WARNING, "Cannot send initial packet: %s.",
 600                     strerror(errno));
 601                 return;
 602         }
 603         if (fmt != NULL) {
 604                 va_start(ap, fmt);
 605                 g_gate_vlog(LOG_WARNING, fmt, ap);
 606                 va_end(ap);
 607         }
 608 }
 609
 610 static void *
 611 malloc_waitok(size_t size)
 612 {
 613         void *p;
 614
 615         while ((p = malloc(size)) == NULL) {
 616                 g_gate_log(LOG_DEBUG, "Cannot allocate %zu bytes.", size);
 617                 sleep(1);
 618         }
 619         return (p);
 620 }
 621
 622 static void *
 623 recv_thread(void *arg)
 624 {
 625         struct ggd_connection *conn;
 626         struct ggd_request *req;
 627         ssize_t data;
 628         int error, fd;
 629
 630         conn = arg;
 631         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 632         fd = conn->c_recvfd;
 633         for (;;) {
 634                 /*
 635                  * Get header packet.
 636                  */
 637                 req = malloc_waitok(sizeof(*req));
 638                 data = g_gate_recv(fd, &req->r_hdr, sizeof(req->r_hdr),
 639                     MSG_WAITALL);
 640                 if (data == 0) {
 641                         g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid());
 642                         exit(EXIT_SUCCESS);
 643                 } else if (data == -1) {
 644                         g_gate_xlog("Error while receiving hdr packet: %s.",
 645                             strerror(errno));
 646                 } else if (data != sizeof(req->r_hdr)) {
 647                         g_gate_xlog("Malformed hdr packet received.");
 648                 }
 649                 g_gate_log(LOG_DEBUG, "Received hdr packet.");
 650                 g_gate_swap2h_hdr(&req->r_hdr);
 651
 652                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 653                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 654
 655                 /*
 656                  * Allocate memory for data.
 657                  */
 658                 req->r_data = malloc_waitok(req->r_length);
 659
 660                 /*
 661                  * Receive data to write for WRITE request.
 662                  */
 663                 if (req->r_cmd == GGATE_CMD_WRITE) {
 664                         g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...",
 665                             req->r_length);
 666                         data = g_gate_recv(fd, req->r_data, req->r_length,
 667                             MSG_WAITALL);
 668                         if (data == -1) {
 669                                 g_gate_xlog("Error while receiving data: %s.",
 670                                     strerror(errno));
 671                         }
 672                 }
 673
 674                 /*
 675                  * Put the request onto the incoming queue.
 676                  */
 677                 error = pthread_mutex_lock(&inqueue_mtx);
 678                 assert(error == 0);
 679                 TAILQ_INSERT_TAIL(&inqueue, req, r_next);
 680                 error = pthread_cond_signal(&inqueue_cond);
 681                 assert(error == 0);
 682                 error = pthread_mutex_unlock(&inqueue_mtx);
 683                 assert(error == 0);
 684         }
 685 }
 686
 687 static void *
 688 disk_thread(void *arg)
 689 {
 690         struct ggd_connection *conn;
 691         struct ggd_request *req;
 692         ssize_t data;
 693         int error, fd;
 694
 695         conn = arg;
 696         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 697         fd = conn->c_diskfd;
 698         for (;;) {
 699                 /*
 700                  * Get a request from the incoming queue.
 701                  */
 702                 error = pthread_mutex_lock(&inqueue_mtx);
 703                 assert(error == 0);
 704                 while ((req = TAILQ_FIRST(&inqueue)) == NULL) {
 705                         error = pthread_cond_wait(&inqueue_cond, &inqueue_mtx);
 706                         assert(error == 0);
 707                 }
 708                 TAILQ_REMOVE(&inqueue, req, r_next);
 709                 error = pthread_mutex_unlock(&inqueue_mtx);
 710                 assert(error == 0);
 711
 712                 /*
 713                  * Check the request.
 714                  */
 715                 assert(req->r_cmd == GGATE_CMD_READ || req->r_cmd == GGATE_CMD_WRITE);
 716                 assert(req->r_offset + req->r_length <= (uintmax_t)conn->c_mediasize);
 717                 assert((req->r_offset % conn->c_sectorsize) == 0);
 718                 assert((req->r_length % conn->c_sectorsize) == 0);
 719
 720                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 721                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 722
 723                 /*
 724                  * Do the request.
 725                  */
 726                 data = 0;
 727                 switch (req->r_cmd) {
 728                 case GGATE_CMD_READ:
 729                         data = pread(fd, req->r_data, req->r_length,
 730                             req->r_offset);
 731                         break;
 732                 case GGATE_CMD_WRITE:
 733                         data = pwrite(fd, req->r_data, req->r_length,
 734                             req->r_offset);
 735                         /* Free data memory here - better sooner. */
 736                         free(req->r_data);
 737                         req->r_data = NULL;
 738                         break;
 739                 }
 740                 if (data != (ssize_t)req->r_length) {
 741                         /* Report short reads/writes as I/O errors. */
 742                         if (errno == 0)
 743                                 errno = EIO;
 744                         g_gate_log(LOG_ERR, "Disk error: %s", strerror(errno));
 745                         req->r_error = errno;
 746                         if (req->r_data != NULL) {
 747                                 free(req->r_data);
 748                                 req->r_data = NULL;
 749                         }
 750                 }
 751
 752                 /*
 753                  * Put the request onto the outgoing queue.
 754                  */
 755                 error = pthread_mutex_lock(&outqueue_mtx);
 756                 assert(error == 0);
 757                 TAILQ_INSERT_TAIL(&outqueue, req, r_next);
 758                 error = pthread_cond_signal(&outqueue_cond);
 759                 assert(error == 0);
 760                 error = pthread_mutex_unlock(&outqueue_mtx);
 761                 assert(error == 0);
 762         }
 763
 764         /* NOTREACHED */
 765         return (NULL);
 766 }
 767
 768 static void *
 769 send_thread(void *arg)
 770 {
 771         struct ggd_connection *conn;
 772         struct ggd_request *req;
 773         ssize_t data;
 774         int error, fd;
 775
 776         conn = arg;
 777         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 778         fd = conn->c_sendfd;
 779         for (;;) {
 780                 /*
 781                  * Get a request from the outgoing queue.
 782                  */
 783                 error = pthread_mutex_lock(&outqueue_mtx);
 784                 assert(error == 0);
 785                 while ((req = TAILQ_FIRST(&outqueue)) == NULL) {
 786                         error = pthread_cond_wait(&outqueue_cond,
 787                             &outqueue_mtx);
 788                         assert(error == 0);
 789                 }
 790                 TAILQ_REMOVE(&outqueue, req, r_next);
 791                 error = pthread_mutex_unlock(&outqueue_mtx);
 792                 assert(error == 0);
 793
 794                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 795                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 796
 797                 /*
 798                  * Send the request.
 799                  */
 800                 g_gate_swap2n_hdr(&req->r_hdr);
 801                 if (g_gate_send(fd, &req->r_hdr, sizeof(req->r_hdr), 0) == -1) {
 802                         g_gate_xlog("Error while sending hdr packet: %s.",
 803                             strerror(errno));
 804                 }
 805                 g_gate_log(LOG_DEBUG, "Sent hdr packet.");
 806                 g_gate_swap2h_hdr(&req->r_hdr);
 807                 if (req->r_data != NULL) {
 808                         data = g_gate_send(fd, req->r_data, req->r_length, 0);
 809                         if (data != (ssize_t)req->r_length) {
 810                                 g_gate_xlog("Error while sending data: %s.",
 811                                     strerror(errno));
 812                         }
 813                         g_gate_log(LOG_DEBUG,
 814                             "Sent %zd bytes (offset=%ju, size=%zu).", data,
 815                             (uintmax_t)req->r_offset, (size_t)req->r_length);
 816                         free(req->r_data);
 817                 }
 818                 free(req);
 819         }
 820
 821         /* NOTREACHED */
 822         return (NULL);
 823 }
 824
 825 static void
 826 log_connection(struct sockaddr *from)
 827 {
 828         in_addr_t ip;
 829
 830         ip = htonl(((struct sockaddr_in *)(void *)from)->sin_addr.s_addr);
 831         g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip));
 832 }
 833
 834 static int
 835 handshake(struct sockaddr *from, int sfd)
 836 {
 837         struct g_gate_version ver;
 838         struct g_gate_cinit cinit;
 839         struct g_gate_sinit sinit;
 840         struct ggd_connection *conn;
 841         struct ggd_export *ex;
 842         ssize_t data;
 843
 844         log_connection(from);
 845         /*
 846          * Phase 1: Version verification.
 847          */
 848         g_gate_log(LOG_DEBUG, "Receiving version packet.");
 849         data = g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL);
 850         g_gate_swap2h_version(&ver);
 851         if (data != sizeof(ver)) {
 852                 g_gate_log(LOG_WARNING, "Malformed version packet.");
 853                 return (0);
 854         }
 855         g_gate_log(LOG_DEBUG, "Version packet received.");
 856         if (memcmp(ver.gv_magic, GGATE_MAGIC, strlen(GGATE_MAGIC)) != 0) {
 857                 g_gate_log(LOG_WARNING, "Invalid magic field.");
 858                 return (0);
 859         }
 860         if (ver.gv_version != GGATE_VERSION) {
 861                 g_gate_log(LOG_WARNING, "Version %u is not supported.",
 862                     ver.gv_version);
 863                 return (0);
 864         }
 865         ver.gv_error = 0;
 866         g_gate_swap2n_version(&ver);
 867         data = g_gate_send(sfd, &ver, sizeof(ver), 0);
 868         g_gate_swap2h_version(&ver);
 869         if (data == -1) {
 870                 sendfail(sfd, errno, "Error while sending version packet: %s.",
 871                     strerror(errno));
 872                 return (0);
 873         }
 874
 875         /*
 876          * Phase 2: Request verification.
 877          */
 878         g_gate_log(LOG_DEBUG, "Receiving initial packet.");
 879         data = g_gate_recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL);
 880         g_gate_swap2h_cinit(&cinit);
 881         if (data != sizeof(cinit)) {
 882                 g_gate_log(LOG_WARNING, "Malformed initial packet.");
 883                 return (0);
 884         }
 885         g_gate_log(LOG_DEBUG, "Initial packet received.");
 886         conn = connection_find(&cinit);
 887         if (conn != NULL) {
 888                 /*
 889                  * Connection should already exists.
 890                  */
 891                 g_gate_log(LOG_DEBUG, "Found existing connection (token=%lu).",
 892                     (unsigned long)conn->c_token);
 893                 if (connection_add(conn, &cinit, from, sfd) == -1) {
 894                         connection_remove(conn);
 895                         return (0);
 896                 }
 897         } else {
 898                 /*
 899                  * New connection, allocate space.
 900                  */
 901                 conn = connection_new(&cinit, from, sfd);
 902                 if (conn == NULL) {
 903                         sendfail(sfd, ENOMEM,
 904                             "Cannot allocate new connection.");
 905                         return (0);
 906                 }
 907                 g_gate_log(LOG_DEBUG, "New connection created (token=%lu).",
 908                     (unsigned long)conn->c_token);
 909         }
 910
 911         ex = exports_find(from, &cinit, conn);
 912         if (ex == NULL) {
 913                 sendfail(sfd, errno, NULL);
 914                 connection_remove(conn);
 915                 return (0);
 916         }
 917         if (conn->c_mediasize == 0) {
 918                 conn->c_mediasize = g_gate_mediasize(conn->c_diskfd);
 919                 conn->c_sectorsize = g_gate_sectorsize(conn->c_diskfd);
 920         }
 921         sinit.gs_mediasize = conn->c_mediasize;
 922         sinit.gs_sectorsize = conn->c_sectorsize;
 923         sinit.gs_error = 0;
 924
 925         g_gate_log(LOG_DEBUG, "Sending initial packet.");
 926
 927         g_gate_swap2n_sinit(&sinit);
 928         data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
 929         g_gate_swap2h_sinit(&sinit);
 930         if (data == -1) {
 931                 sendfail(sfd, errno, "Error while sending initial packet: %s.",
 932                     strerror(errno));
 933                 return (0);
 934         }
 935
 936         if (connection_ready(conn)) {
 937                 connection_launch(conn);
 938                 connection_remove(conn);
 939         }
 940         return (1);
 941 }
 942
 943 static void
 944 huphandler(int sig __unused)
 945 {
 946
 947         got_sighup = 1;
 948 }
 949
 950 int
 951 main(int argc, char *argv[])
 952 {
 953         const char *ggated_pidfile = _PATH_VARRUN "/ggated.pid";
 954         struct pidfh *pfh;
 955         struct sockaddr_in serv;
 956         struct sockaddr from;
 957         socklen_t fromlen;
 958         pid_t otherpid;
 959         int ch, sfd, tmpsfd;
 960         unsigned port;
 961
 962         bindaddr = htonl(INADDR_ANY);
 963         port = G_GATE_PORT;
 964         while ((ch = getopt(argc, argv, "a:hnp:F:R:S:v")) != -1) {
 965                 switch (ch) {
 966                 case 'a':
 967                         bindaddr = g_gate_str2ip(optarg);
 968                         if (bindaddr == INADDR_NONE) {
 969                                 errx(EXIT_FAILURE,
 970                                     "Invalid IP/host name to bind to.");
 971                         }
 972                         break;
 973                 case 'F':
 974                         ggated_pidfile = optarg;
 975                         break;
 976                 case 'n':
 977                         nagle = 0;
 978                         break;
 979                 case 'p':
 980                         errno = 0;
 981                         port = strtoul(optarg, NULL, 10);
 982                         if (port == 0 && errno != 0)
 983                                 errx(EXIT_FAILURE, "Invalid port.");
 984                         break;
 985                 case 'R':
 986                         errno = 0;
 987                         rcvbuf = strtoul(optarg, NULL, 10);
 988                         if (rcvbuf == 0 && errno != 0)
 989                                 errx(EXIT_FAILURE, "Invalid rcvbuf.");
 990                         break;
 991                 case 'S':
 992                         errno = 0;
 993                         sndbuf = strtoul(optarg, NULL, 10);
 994                         if (sndbuf == 0 && errno != 0)
 995                                 errx(EXIT_FAILURE, "Invalid sndbuf.");
 996                         break;
 997                 case 'v':
 998                         g_gate_verbose++;
 999                         break;
1000                 case 'h':
1001                 default:
1002                         usage();
1003                 }
1004         }
1005         argc -= optind;
1006         argv += optind;
1007
1008         if (argv[0] != NULL)
1009                 exports_file = argv[0];
1010         exports_get();
1011
1012         pfh = pidfile_open(ggated_pidfile, 0600, &otherpid);
1013         if (pfh == NULL) {
1014                 if (errno == EEXIST) {
1015                         errx(EXIT_FAILURE, "Daemon already running, pid: %jd.",
1016                             (intmax_t)otherpid);
1017                 }
1018                 err(EXIT_FAILURE, "Cannot open/create pidfile");
1019         }
1020
1021         if (!g_gate_verbose) {
1022                 /* Run in daemon mode. */
1023                 if (daemon(0, 0) == -1)
1024                         g_gate_xlog("Cannot daemonize: %s", strerror(errno));
1025         }
1026
1027         pidfile_write(pfh);
1028
1029         signal(SIGCHLD, SIG_IGN);
1030
1031         sfd = socket(AF_INET, SOCK_STREAM, 0);
1032         if (sfd == -1)
1033                 g_gate_xlog("Cannot open stream socket: %s.", strerror(errno));
1034         bzero(&serv, sizeof(serv));
1035         serv.sin_family = AF_INET;
1036         serv.sin_addr.s_addr = bindaddr;
1037         serv.sin_port = htons(port);
1038
1039         g_gate_socket_settings(sfd);
1040
1041         if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1)
1042                 g_gate_xlog("bind(): %s.", strerror(errno));
1043         if (listen(sfd, 5) == -1)
1044                 g_gate_xlog("listen(): %s.", strerror(errno));
1045
1046         g_gate_log(LOG_INFO, "Listen on port: %d.", port);
1047
1048         signal(SIGHUP, huphandler);
1049
1050         for (;;) {
1051                 fromlen = sizeof(from);
1052                 tmpsfd = accept(sfd, &from, &fromlen);
1053                 if (tmpsfd == -1)
1054                         g_gate_xlog("accept(): %s.", strerror(errno));
1055
1056                 if (got_sighup) {
1057                         got_sighup = 0;
1058                         exports_get();
1059                 }
1060
1061                 if (!handshake(&from, tmpsfd))
1062                         close(tmpsfd);
1063         }
1064         close(sfd);
1065         pidfile_remove(pfh);
1066         exit(EXIT_SUCCESS);
1067 }