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         memset(&sinit, 0, sizeof(sinit));
 595         sinit.gs_error = error;
 596         g_gate_swap2n_sinit(&sinit);
 597         data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
 598         g_gate_swap2h_sinit(&sinit);
 599         if (data != sizeof(sinit)) {
 600                 g_gate_log(LOG_WARNING, "Cannot send initial packet: %s.",
 601                     strerror(errno));
 602                 return;
 603         }
 604         if (fmt != NULL) {
 605                 va_start(ap, fmt);
 606                 g_gate_vlog(LOG_WARNING, fmt, ap);
 607                 va_end(ap);
 608         }
 609 }
 610
 611 static void *
 612 malloc_waitok(size_t size)
 613 {
 614         void *p;
 615
 616         while ((p = malloc(size)) == NULL) {
 617                 g_gate_log(LOG_DEBUG, "Cannot allocate %zu bytes.", size);
 618                 sleep(1);
 619         }
 620         return (p);
 621 }
 622
 623 static void *
 624 recv_thread(void *arg)
 625 {
 626         struct ggd_connection *conn;
 627         struct ggd_request *req;
 628         ssize_t data;
 629         int error, fd;
 630
 631         conn = arg;
 632         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 633         fd = conn->c_recvfd;
 634         for (;;) {
 635                 /*
 636                  * Get header packet.
 637                  */
 638                 req = malloc_waitok(sizeof(*req));
 639                 data = g_gate_recv(fd, &req->r_hdr, sizeof(req->r_hdr),
 640                     MSG_WAITALL);
 641                 if (data == 0) {
 642                         g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid());
 643                         exit(EXIT_SUCCESS);
 644                 } else if (data == -1) {
 645                         g_gate_xlog("Error while receiving hdr packet: %s.",
 646                             strerror(errno));
 647                 } else if (data != sizeof(req->r_hdr)) {
 648                         g_gate_xlog("Malformed hdr packet received.");
 649                 }
 650                 g_gate_log(LOG_DEBUG, "Received hdr packet.");
 651                 g_gate_swap2h_hdr(&req->r_hdr);
 652
 653                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 654                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 655
 656                 /*
 657                  * Allocate memory for data.
 658                  */
 659                 req->r_data = malloc_waitok(req->r_length);
 660
 661                 /*
 662                  * Receive data to write for WRITE request.
 663                  */
 664                 if (req->r_cmd == GGATE_CMD_WRITE) {
 665                         g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...",
 666                             req->r_length);
 667                         data = g_gate_recv(fd, req->r_data, req->r_length,
 668                             MSG_WAITALL);
 669                         if (data == -1) {
 670                                 g_gate_xlog("Error while receiving data: %s.",
 671                                     strerror(errno));
 672                         }
 673                 }
 674
 675                 /*
 676                  * Put the request onto the incoming queue.
 677                  */
 678                 error = pthread_mutex_lock(&inqueue_mtx);
 679                 assert(error == 0);
 680                 TAILQ_INSERT_TAIL(&inqueue, req, r_next);
 681                 error = pthread_cond_signal(&inqueue_cond);
 682                 assert(error == 0);
 683                 error = pthread_mutex_unlock(&inqueue_mtx);
 684                 assert(error == 0);
 685         }
 686 }
 687
 688 static void *
 689 disk_thread(void *arg)
 690 {
 691         struct ggd_connection *conn;
 692         struct ggd_request *req;
 693         ssize_t data;
 694         int error, fd;
 695
 696         conn = arg;
 697         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 698         fd = conn->c_diskfd;
 699         for (;;) {
 700                 /*
 701                  * Get a request from the incoming queue.
 702                  */
 703                 error = pthread_mutex_lock(&inqueue_mtx);
 704                 assert(error == 0);
 705                 while ((req = TAILQ_FIRST(&inqueue)) == NULL) {
 706                         error = pthread_cond_wait(&inqueue_cond, &inqueue_mtx);
 707                         assert(error == 0);
 708                 }
 709                 TAILQ_REMOVE(&inqueue, req, r_next);
 710                 error = pthread_mutex_unlock(&inqueue_mtx);
 711                 assert(error == 0);
 712
 713                 /*
 714                  * Check the request.
 715                  */
 716                 assert(req->r_cmd == GGATE_CMD_READ || req->r_cmd == GGATE_CMD_WRITE);
 717                 assert(req->r_offset + req->r_length <= (uintmax_t)conn->c_mediasize);
 718                 assert((req->r_offset % conn->c_sectorsize) == 0);
 719                 assert((req->r_length % conn->c_sectorsize) == 0);
 720
 721                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 722                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 723
 724                 /*
 725                  * Do the request.
 726                  */
 727                 data = 0;
 728                 switch (req->r_cmd) {
 729                 case GGATE_CMD_READ:
 730                         data = pread(fd, req->r_data, req->r_length,
 731                             req->r_offset);
 732                         break;
 733                 case GGATE_CMD_WRITE:
 734                         data = pwrite(fd, req->r_data, req->r_length,
 735                             req->r_offset);
 736                         /* Free data memory here - better sooner. */
 737                         free(req->r_data);
 738                         req->r_data = NULL;
 739                         break;
 740                 }
 741                 if (data != (ssize_t)req->r_length) {
 742                         /* Report short reads/writes as I/O errors. */
 743                         if (errno == 0)
 744                                 errno = EIO;
 745                         g_gate_log(LOG_ERR, "Disk error: %s", strerror(errno));
 746                         req->r_error = errno;
 747                         if (req->r_data != NULL) {
 748                                 free(req->r_data);
 749                                 req->r_data = NULL;
 750                         }
 751                 }
 752
 753                 /*
 754                  * Put the request onto the outgoing queue.
 755                  */
 756                 error = pthread_mutex_lock(&outqueue_mtx);
 757                 assert(error == 0);
 758                 TAILQ_INSERT_TAIL(&outqueue, req, r_next);
 759                 error = pthread_cond_signal(&outqueue_cond);
 760                 assert(error == 0);
 761                 error = pthread_mutex_unlock(&outqueue_mtx);
 762                 assert(error == 0);
 763         }
 764
 765         /* NOTREACHED */
 766         return (NULL);
 767 }
 768
 769 static void *
 770 send_thread(void *arg)
 771 {
 772         struct ggd_connection *conn;
 773         struct ggd_request *req;
 774         ssize_t data;
 775         int error, fd;
 776
 777         conn = arg;
 778         g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path);
 779         fd = conn->c_sendfd;
 780         for (;;) {
 781                 /*
 782                  * Get a request from the outgoing queue.
 783                  */
 784                 error = pthread_mutex_lock(&outqueue_mtx);
 785                 assert(error == 0);
 786                 while ((req = TAILQ_FIRST(&outqueue)) == NULL) {
 787                         error = pthread_cond_wait(&outqueue_cond,
 788                             &outqueue_mtx);
 789                         assert(error == 0);
 790                 }
 791                 TAILQ_REMOVE(&outqueue, req, r_next);
 792                 error = pthread_mutex_unlock(&outqueue_mtx);
 793                 assert(error == 0);
 794
 795                 g_gate_log(LOG_DEBUG, "%s: offset=%jd length=%u", __func__,
 796                     (intmax_t)req->r_offset, (unsigned)req->r_length);
 797
 798                 /*
 799                  * Send the request.
 800                  */
 801                 g_gate_swap2n_hdr(&req->r_hdr);
 802                 if (g_gate_send(fd, &req->r_hdr, sizeof(req->r_hdr), 0) == -1) {
 803                         g_gate_xlog("Error while sending hdr packet: %s.",
 804                             strerror(errno));
 805                 }
 806                 g_gate_log(LOG_DEBUG, "Sent hdr packet.");
 807                 g_gate_swap2h_hdr(&req->r_hdr);
 808                 if (req->r_data != NULL) {
 809                         data = g_gate_send(fd, req->r_data, req->r_length, 0);
 810                         if (data != (ssize_t)req->r_length) {
 811                                 g_gate_xlog("Error while sending data: %s.",
 812                                     strerror(errno));
 813                         }
 814                         g_gate_log(LOG_DEBUG,
 815                             "Sent %zd bytes (offset=%ju, size=%zu).", data,
 816                             (uintmax_t)req->r_offset, (size_t)req->r_length);
 817                         free(req->r_data);
 818                 }
 819                 free(req);
 820         }
 821
 822         /* NOTREACHED */
 823         return (NULL);
 824 }
 825
 826 static void
 827 log_connection(struct sockaddr *from)
 828 {
 829         in_addr_t ip;
 830
 831         ip = htonl(((struct sockaddr_in *)(void *)from)->sin_addr.s_addr);
 832         g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip));
 833 }
 834
 835 static int
 836 handshake(struct sockaddr *from, int sfd)
 837 {
 838         struct g_gate_version ver;
 839         struct g_gate_cinit cinit;
 840         struct g_gate_sinit sinit;
 841         struct ggd_connection *conn;
 842         struct ggd_export *ex;
 843         ssize_t data;
 844
 845         log_connection(from);
 846         /*
 847          * Phase 1: Version verification.
 848          */
 849         g_gate_log(LOG_DEBUG, "Receiving version packet.");
 850         data = g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL);
 851         g_gate_swap2h_version(&ver);
 852         if (data != sizeof(ver)) {
 853                 g_gate_log(LOG_WARNING, "Malformed version packet.");
 854                 return (0);
 855         }
 856         g_gate_log(LOG_DEBUG, "Version packet received.");
 857         if (memcmp(ver.gv_magic, GGATE_MAGIC, strlen(GGATE_MAGIC)) != 0) {
 858                 g_gate_log(LOG_WARNING, "Invalid magic field.");
 859                 return (0);
 860         }
 861         if (ver.gv_version != GGATE_VERSION) {
 862                 g_gate_log(LOG_WARNING, "Version %u is not supported.",
 863                     ver.gv_version);
 864                 return (0);
 865         }
 866         ver.gv_error = 0;
 867         g_gate_swap2n_version(&ver);
 868         data = g_gate_send(sfd, &ver, sizeof(ver), 0);
 869         g_gate_swap2h_version(&ver);
 870         if (data == -1) {
 871                 sendfail(sfd, errno, "Error while sending version packet: %s.",
 872                     strerror(errno));
 873                 return (0);
 874         }
 875
 876         /*
 877          * Phase 2: Request verification.
 878          */
 879         g_gate_log(LOG_DEBUG, "Receiving initial packet.");
 880         data = g_gate_recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL);
 881         g_gate_swap2h_cinit(&cinit);
 882         if (data != sizeof(cinit)) {
 883                 g_gate_log(LOG_WARNING, "Malformed initial packet.");
 884                 return (0);
 885         }
 886         g_gate_log(LOG_DEBUG, "Initial packet received.");
 887         conn = connection_find(&cinit);
 888         if (conn != NULL) {
 889                 /*
 890                  * Connection should already exists.
 891                  */
 892                 g_gate_log(LOG_DEBUG, "Found existing connection (token=%lu).",
 893                     (unsigned long)conn->c_token);
 894                 if (connection_add(conn, &cinit, from, sfd) == -1) {
 895                         connection_remove(conn);
 896                         return (0);
 897                 }
 898         } else {
 899                 /*
 900                  * New connection, allocate space.
 901                  */
 902                 conn = connection_new(&cinit, from, sfd);
 903                 if (conn == NULL) {
 904                         sendfail(sfd, ENOMEM,
 905                             "Cannot allocate new connection.");
 906                         return (0);
 907                 }
 908                 g_gate_log(LOG_DEBUG, "New connection created (token=%lu).",
 909                     (unsigned long)conn->c_token);
 910         }
 911
 912         ex = exports_find(from, &cinit, conn);
 913         if (ex == NULL) {
 914                 sendfail(sfd, errno, NULL);
 915                 connection_remove(conn);
 916                 return (0);
 917         }
 918         if (conn->c_mediasize == 0) {
 919                 conn->c_mediasize = g_gate_mediasize(conn->c_diskfd);
 920                 conn->c_sectorsize = g_gate_sectorsize(conn->c_diskfd);
 921         }
 922         sinit.gs_mediasize = conn->c_mediasize;
 923         sinit.gs_sectorsize = conn->c_sectorsize;
 924         sinit.gs_error = 0;
 925
 926         g_gate_log(LOG_DEBUG, "Sending initial packet.");
 927
 928         g_gate_swap2n_sinit(&sinit);
 929         data = g_gate_send(sfd, &sinit, sizeof(sinit), 0);
 930         g_gate_swap2h_sinit(&sinit);
 931         if (data == -1) {
 932                 sendfail(sfd, errno, "Error while sending initial packet: %s.",
 933                     strerror(errno));
 934                 return (0);
 935         }
 936
 937         if (connection_ready(conn)) {
 938                 connection_launch(conn);
 939                 connection_remove(conn);
 940         }
 941         return (1);
 942 }
 943
 944 static void
 945 huphandler(int sig __unused)
 946 {
 947
 948         got_sighup = 1;
 949 }
 950
 951 int
 952 main(int argc, char *argv[])
 953 {
 954         const char *ggated_pidfile = _PATH_VARRUN "/ggated.pid";
 955         struct pidfh *pfh;
 956         struct sockaddr_in serv;
 957         struct sockaddr from;
 958         socklen_t fromlen;
 959         pid_t otherpid;
 960         int ch, sfd, tmpsfd;
 961         unsigned port;
 962
 963         bindaddr = htonl(INADDR_ANY);
 964         port = G_GATE_PORT;
 965         while ((ch = getopt(argc, argv, "a:hnp:F:R:S:v")) != -1) {
 966                 switch (ch) {
 967                 case 'a':
 968                         bindaddr = g_gate_str2ip(optarg);
 969                         if (bindaddr == INADDR_NONE) {
 970                                 errx(EXIT_FAILURE,
 971                                     "Invalid IP/host name to bind to.");
 972                         }
 973                         break;
 974                 case 'F':
 975                         ggated_pidfile = optarg;
 976                         break;
 977                 case 'n':
 978                         nagle = 0;
 979                         break;
 980                 case 'p':
 981                         errno = 0;
 982                         port = strtoul(optarg, NULL, 10);
 983                         if (port == 0 && errno != 0)
 984                                 errx(EXIT_FAILURE, "Invalid port.");
 985                         break;
 986                 case 'R':
 987                         errno = 0;
 988                         rcvbuf = strtoul(optarg, NULL, 10);
 989                         if (rcvbuf == 0 && errno != 0)
 990                                 errx(EXIT_FAILURE, "Invalid rcvbuf.");
 991                         break;
 992                 case 'S':
 993                         errno = 0;
 994                         sndbuf = strtoul(optarg, NULL, 10);
 995                         if (sndbuf == 0 && errno != 0)
 996                                 errx(EXIT_FAILURE, "Invalid sndbuf.");
 997                         break;
 998                 case 'v':
 999                         g_gate_verbose++;
1000                         break;
1001                 case 'h':
1002                 default:
1003                         usage();
1004                 }
1005         }
1006         argc -= optind;
1007         argv += optind;
1008
1009         if (argv[0] != NULL)
1010                 exports_file = argv[0];
1011         exports_get();
1012
1013         pfh = pidfile_open(ggated_pidfile, 0600, &otherpid);
1014         if (pfh == NULL) {
1015                 if (errno == EEXIST) {
1016                         errx(EXIT_FAILURE, "Daemon already running, pid: %jd.",
1017                             (intmax_t)otherpid);
1018                 }
1019                 err(EXIT_FAILURE, "Cannot open/create pidfile");
1020         }
1021
1022         if (!g_gate_verbose) {
1023                 /* Run in daemon mode. */
1024                 if (daemon(0, 0) == -1)
1025                         g_gate_xlog("Cannot daemonize: %s", strerror(errno));
1026         }
1027
1028         pidfile_write(pfh);
1029
1030         signal(SIGCHLD, SIG_IGN);
1031
1032         sfd = socket(AF_INET, SOCK_STREAM, 0);
1033         if (sfd == -1)
1034                 g_gate_xlog("Cannot open stream socket: %s.", strerror(errno));
1035         bzero(&serv, sizeof(serv));
1036         serv.sin_family = AF_INET;
1037         serv.sin_addr.s_addr = bindaddr;
1038         serv.sin_port = htons(port);
1039
1040         g_gate_socket_settings(sfd);
1041
1042         if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1)
1043                 g_gate_xlog("bind(): %s.", strerror(errno));
1044         if (listen(sfd, 5) == -1)
1045                 g_gate_xlog("listen(): %s.", strerror(errno));
1046
1047         g_gate_log(LOG_INFO, "Listen on port: %d.", port);
1048
1049         signal(SIGHUP, huphandler);
1050
1051         for (;;) {
1052                 fromlen = sizeof(from);
1053                 tmpsfd = accept(sfd, &from, &fromlen);
1054                 if (tmpsfd == -1)
1055                         g_gate_xlog("accept(): %s.", strerror(errno));
1056
1057                 if (got_sighup) {
1058                         got_sighup = 0;
1059                         exports_get();
1060                 }
1061
1062                 if (!handshake(&from, tmpsfd))
1063                         close(tmpsfd);
1064         }
1065         close(sfd);
1066         pidfile_remove(pfh);
1067         exit(EXIT_SUCCESS);
1068 }