daemon.c

   1 #include <signal.h>
   2 #include <sys/wait.h>
   3 #include <sys/socket.h>
   4 #include <sys/time.h>
   5 #include <sys/poll.h>
   6 #include <netdb.h>
   7 #include <netinet/in.h>
   8 #include <arpa/inet.h>
   9 #include <syslog.h>
  10 #include "pkt-line.h"
  11 #include "cache.h"
  12 #include "exec_cmd.h"
  13
  14 static int log_syslog;
  15 static int verbose;
  16 static int reuseaddr;
  17
  18 static const char daemon_usage[] =
  19 "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
  20 "           [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
  21 "           [--base-path=path] [--user-path | --user-path=path]\n"
  22 "           [--reuseaddr] [directory...]";
  23
  24 /* List of acceptable pathname prefixes */
  25 static char **ok_paths = NULL;
  26 static int strict_paths = 0;
  27
  28 /* If this is set, git-daemon-export-ok is not required */
  29 static int export_all_trees = 0;
  30
  31 /* Take all paths relative to this one if non-NULL */
  32 static char *base_path = NULL;
  33
  34 /* If defined, ~user notation is allowed and the string is inserted
  35  * after ~user/.  E.g. a request to git://host/~alice/frotz would
  36  * go to /home/alice/pub_git/frotz with --user-path=pub_git.
  37  */
  38 static char *user_path = NULL;
  39
  40 /* Timeout, and initial timeout */
  41 static unsigned int timeout = 0;
  42 static unsigned int init_timeout = 0;
  43
  44 static void logreport(int priority, const char *err, va_list params)
  45 {
  46         /* We should do a single write so that it is atomic and output
  47          * of several processes do not get intermingled. */
  48         char buf[1024];
  49         int buflen;
  50         int maxlen, msglen;
  51
  52         /* sizeof(buf) should be big enough for "[pid] \n" */
  53         buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
  54
  55         maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
  56         msglen = vsnprintf(buf + buflen, maxlen, err, params);
  57
  58         if (log_syslog) {
  59                 syslog(priority, "%s", buf);
  60                 return;
  61         }
  62
  63         /* maxlen counted our own LF but also counts space given to
  64          * vsnprintf for the terminating NUL.  We want to make sure that
  65          * we have space for our own LF and NUL after the "meat" of the
  66          * message, so truncate it at maxlen - 1.
  67          */
  68         if (msglen > maxlen - 1)
  69                 msglen = maxlen - 1;
  70         else if (msglen < 0)
  71                 msglen = 0; /* Protect against weird return values. */
  72         buflen += msglen;
  73
  74         buf[buflen++] = '\n';
  75         buf[buflen] = '\0';
  76
  77         write(2, buf, buflen);
  78 }
  79
  80 static void logerror(const char *err, ...)
  81 {
  82         va_list params;
  83         va_start(params, err);
  84         logreport(LOG_ERR, err, params);
  85         va_end(params);
  86 }
  87
  88 static void loginfo(const char *err, ...)
  89 {
  90         va_list params;
  91         if (!verbose)
  92                 return;
  93         va_start(params, err);
  94         logreport(LOG_INFO, err, params);
  95         va_end(params);
  96 }
  97
  98 static int avoid_alias(char *p)
  99 {
 100         int sl, ndot;
 101
 102         /*
 103          * This resurrects the belts and suspenders paranoia check by HPA
 104          * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
 105          * does not do getcwd() based path canonicalizations.
 106          *
 107          * sl becomes true immediately after seeing '/' and continues to
 108          * be true as long as dots continue after that without intervening
 109          * non-dot character.
 110          */
 111         if (!p || (*p != '/' && *p != '~'))
 112                 return -1;
 113         sl = 1; ndot = 0;
 114         p++;
 115
 116         while (1) {
 117                 char ch = *p++;
 118                 if (sl) {
 119                         if (ch == '.')
 120                                 ndot++;
 121                         else if (ch == '/') {
 122                                 if (ndot < 3)
 123                                         /* reject //, /./ and /../ */
 124                                         return -1;
 125                                 ndot = 0;
 126                         }
 127                         else if (ch == 0) {
 128                                 if (0 < ndot && ndot < 3)
 129                                         /* reject /.$ and /..$ */
 130                                         return -1;
 131                                 return 0;
 132                         }
 133                         else
 134                                 sl = ndot = 0;
 135                 }
 136                 else if (ch == 0)
 137                         return 0;
 138                 else if (ch == '/') {
 139                         sl = 1;
 140                         ndot = 0;
 141                 }
 142         }
 143 }
 144
 145 static char *path_ok(char *dir)
 146 {
 147         static char rpath[PATH_MAX];
 148         char *path;
 149
 150         if (avoid_alias(dir)) {
 151                 logerror("'%s': aliased", dir);
 152                 return NULL;
 153         }
 154
 155         if (*dir == '~') {
 156                 if (!user_path) {
 157                         logerror("'%s': User-path not allowed", dir);
 158                         return NULL;
 159                 }
 160                 if (*user_path) {
 161                         /* Got either "~alice" or "~alice/foo";
 162                          * rewrite them to "~alice/%s" or
 163                          * "~alice/%s/foo".
 164                          */
 165                         int namlen, restlen = strlen(dir);
 166                         char *slash = strchr(dir, '/');
 167                         if (!slash)
 168                                 slash = dir + restlen;
 169                         namlen = slash - dir;
 170                         restlen -= namlen;
 171                         loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
 172                         snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
 173                                  namlen, dir, user_path, restlen, slash);
 174                         dir = rpath;
 175                 }
 176         }
 177         else if (base_path) {
 178                 if (*dir != '/') {
 179                         /* Allow only absolute */
 180                         logerror("'%s': Non-absolute path denied (base-path active)", dir);
 181                         return NULL;
 182                 }
 183                 else {
 184                         snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
 185                         dir = rpath;
 186                 }
 187         }
 188
 189         path = enter_repo(dir, strict_paths);
 190
 191         if (!path) {
 192                 logerror("'%s': unable to chdir or not a git archive", dir);
 193                 return NULL;
 194         }
 195
 196         if ( ok_paths && *ok_paths ) {
 197                 char **pp;
 198                 int pathlen = strlen(path);
 199
 200                 /* The validation is done on the paths after enter_repo
 201                  * appends optional {.git,.git/.git} and friends, but
 202                  * it does not use getcwd().  So if your /pub is
 203                  * a symlink to /mnt/pub, you can whitelist /pub and
 204                  * do not have to say /mnt/pub.
 205                  * Do not say /pub/.
 206                  */
 207                 for ( pp = ok_paths ; *pp ; pp++ ) {
 208                         int len = strlen(*pp);
 209                         if (len <= pathlen &&
 210                             !memcmp(*pp, path, len) &&
 211                             (path[len] == '\0' ||
 212                              (!strict_paths && path[len] == '/')))
 213                                 return path;
 214                 }
 215         }
 216         else {
 217                 /* be backwards compatible */
 218                 if (!strict_paths)
 219                         return path;
 220         }
 221
 222         logerror("'%s': not in whitelist", path);
 223         return NULL;            /* Fallthrough. Deny by default */
 224 }
 225
 226 static int upload(char *dir)
 227 {
 228         /* Timeout as string */
 229         char timeout_buf[64];
 230         const char *path;
 231
 232         loginfo("Request for '%s'", dir);
 233
 234         if (!(path = path_ok(dir)))
 235                 return -1;
 236
 237         /*
 238          * Security on the cheap.
 239          *
 240          * We want a readable HEAD, usable "objects" directory, and
 241          * a "git-daemon-export-ok" flag that says that the other side
 242          * is ok with us doing this.
 243          *
 244          * path_ok() uses enter_repo() and does whitelist checking.
 245          * We only need to make sure the repository is exported.
 246          */
 247
 248         if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
 249                 logerror("'%s': repository not exported.", path);
 250                 errno = EACCES;
 251                 return -1;
 252         }
 253
 254         /*
 255          * We'll ignore SIGTERM from now on, we have a
 256          * good client.
 257          */
 258         signal(SIGTERM, SIG_IGN);
 259
 260         snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
 261
 262         /* git-upload-pack only ever reads stuff, so this is safe */
 263         execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
 264         return -1;
 265 }
 266
 267 static int execute(void)
 268 {
 269         static char line[1000];
 270         int pktlen, len;
 271
 272         alarm(init_timeout ? init_timeout : timeout);
 273         pktlen = packet_read_line(0, line, sizeof(line));
 274         alarm(0);
 275
 276         len = strlen(line);
 277         if (pktlen != len)
 278                 loginfo("Extended attributes (%d bytes) exist <%.*s>",
 279                         (int) pktlen - len,
 280                         (int) pktlen - len, line + len + 1);
 281         if (len && line[len-1] == '\n')
 282                 line[--len] = 0;
 283
 284         if (!strncmp("git-upload-pack ", line, 16))
 285                 return upload(line+16);
 286
 287         logerror("Protocol error: '%s'", line);
 288         return -1;
 289 }
 290
 291
 292 /*
 293  * We count spawned/reaped separately, just to avoid any
 294  * races when updating them from signals. The SIGCHLD handler
 295  * will only update children_reaped, and the fork logic will
 296  * only update children_spawned.
 297  *
 298  * MAX_CHILDREN should be a power-of-two to make the modulus
 299  * operation cheap. It should also be at least twice
 300  * the maximum number of connections we will ever allow.
 301  */
 302 #define MAX_CHILDREN 128
 303
 304 static int max_connections = 25;
 305
 306 /* These are updated by the signal handler */
 307 static volatile unsigned int children_reaped = 0;
 308 static pid_t dead_child[MAX_CHILDREN];
 309
 310 /* These are updated by the main loop */
 311 static unsigned int children_spawned = 0;
 312 static unsigned int children_deleted = 0;
 313
 314 static struct child {
 315         pid_t pid;
 316         int addrlen;
 317         struct sockaddr_storage address;
 318 } live_child[MAX_CHILDREN];
 319
 320 static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
 321 {
 322         live_child[idx].pid = pid;
 323         live_child[idx].addrlen = addrlen;
 324         memcpy(&live_child[idx].address, addr, addrlen);
 325 }
 326
 327 /*
 328  * Walk from "deleted" to "spawned", and remove child "pid".
 329  *
 330  * We move everything up by one, since the new "deleted" will
 331  * be one higher.
 332  */
 333 static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
 334 {
 335         struct child n;
 336
 337         deleted %= MAX_CHILDREN;
 338         spawned %= MAX_CHILDREN;
 339         if (live_child[deleted].pid == pid) {
 340                 live_child[deleted].pid = -1;
 341                 return;
 342         }
 343         n = live_child[deleted];
 344         for (;;) {
 345                 struct child m;
 346                 deleted = (deleted + 1) % MAX_CHILDREN;
 347                 if (deleted == spawned)
 348                         die("could not find dead child %d\n", pid);
 349                 m = live_child[deleted];
 350                 live_child[deleted] = n;
 351                 if (m.pid == pid)
 352                         return;
 353                 n = m;
 354         }
 355 }
 356
 357 /*
 358  * This gets called if the number of connections grows
 359  * past "max_connections".
 360  *
 361  * We _should_ start off by searching for connections
 362  * from the same IP, and if there is some address wth
 363  * multiple connections, we should kill that first.
 364  *
 365  * As it is, we just "randomly" kill 25% of the connections,
 366  * and our pseudo-random generator sucks too. I have no
 367  * shame.
 368  *
 369  * Really, this is just a place-holder for a _real_ algorithm.
 370  */
 371 static void kill_some_children(int signo, unsigned start, unsigned stop)
 372 {
 373         start %= MAX_CHILDREN;
 374         stop %= MAX_CHILDREN;
 375         while (start != stop) {
 376                 if (!(start & 3))
 377                         kill(live_child[start].pid, signo);
 378                 start = (start + 1) % MAX_CHILDREN;
 379         }
 380 }
 381
 382 static void check_max_connections(void)
 383 {
 384         for (;;) {
 385                 int active;
 386                 unsigned spawned, reaped, deleted;
 387
 388                 spawned = children_spawned;
 389                 reaped = children_reaped;
 390                 deleted = children_deleted;
 391
 392                 while (deleted < reaped) {
 393                         pid_t pid = dead_child[deleted % MAX_CHILDREN];
 394                         remove_child(pid, deleted, spawned);
 395                         deleted++;
 396                 }
 397                 children_deleted = deleted;
 398
 399                 active = spawned - deleted;
 400                 if (active <= max_connections)
 401                         break;
 402
 403                 /* Kill some unstarted connections with SIGTERM */
 404                 kill_some_children(SIGTERM, deleted, spawned);
 405                 if (active <= max_connections << 1)
 406                         break;
 407
 408                 /* If the SIGTERM thing isn't helping use SIGKILL */
 409                 kill_some_children(SIGKILL, deleted, spawned);
 410                 sleep(1);
 411         }
 412 }
 413
 414 static void handle(int incoming, struct sockaddr *addr, int addrlen)
 415 {
 416         pid_t pid = fork();
 417         char addrbuf[256] = "";
 418         int port = -1;
 419
 420         if (pid) {
 421                 unsigned idx;
 422
 423                 close(incoming);
 424                 if (pid < 0)
 425                         return;
 426
 427                 idx = children_spawned % MAX_CHILDREN;
 428                 children_spawned++;
 429                 add_child(idx, pid, addr, addrlen);
 430
 431                 check_max_connections();
 432                 return;
 433         }
 434
 435         dup2(incoming, 0);
 436         dup2(incoming, 1);
 437         close(incoming);
 438
 439         if (addr->sa_family == AF_INET) {
 440                 struct sockaddr_in *sin_addr = (void *) addr;
 441                 inet_ntop(AF_INET, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
 442                 port = sin_addr->sin_port;
 443
 444 #ifndef NO_IPV6
 445         } else if (addr->sa_family == AF_INET6) {
 446                 struct sockaddr_in6 *sin6_addr = (void *) addr;
 447
 448                 char *buf = addrbuf;
 449                 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
 450                 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
 451                 strcat(buf, "]");
 452
 453                 port = sin6_addr->sin6_port;
 454 #endif
 455         }
 456         loginfo("Connection from %s:%d", addrbuf, port);
 457
 458         exit(execute());
 459 }
 460
 461 static void child_handler(int signo)
 462 {
 463         for (;;) {
 464                 int status;
 465                 pid_t pid = waitpid(-1, &status, WNOHANG);
 466
 467                 if (pid > 0) {
 468                         unsigned reaped = children_reaped;
 469                         dead_child[reaped % MAX_CHILDREN] = pid;
 470                         children_reaped = reaped + 1;
 471                         /* XXX: Custom logging, since we don't wanna getpid() */
 472                         if (verbose) {
 473                                 char *dead = "";
 474                                 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 475                                         dead = " (with error)";
 476                                 if (log_syslog)
 477                                         syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
 478                                 else
 479                                         fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
 480                         }
 481                         continue;
 482                 }
 483                 break;
 484         }
 485 }
 486
 487 static int set_reuse_addr(int sockfd)
 488 {
 489         int on = 1;
 490
 491         if (!reuseaddr)
 492                 return 0;
 493         return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
 494                           &on, sizeof(on));
 495 }
 496
 497 #ifndef NO_IPV6
 498
 499 static int socksetup(int port, int **socklist_p)
 500 {
 501         int socknum = 0, *socklist = NULL;
 502         int maxfd = -1;
 503         char pbuf[NI_MAXSERV];
 504
 505         struct addrinfo hints, *ai0, *ai;
 506         int gai;
 507
 508         sprintf(pbuf, "%d", port);
 509         memset(&hints, 0, sizeof(hints));
 510         hints.ai_family = AF_UNSPEC;
 511         hints.ai_socktype = SOCK_STREAM;
 512         hints.ai_protocol = IPPROTO_TCP;
 513         hints.ai_flags = AI_PASSIVE;
 514
 515         gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
 516         if (gai)
 517                 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
 518
 519         for (ai = ai0; ai; ai = ai->ai_next) {
 520                 int sockfd;
 521                 int *newlist;
 522
 523                 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 524                 if (sockfd < 0)
 525                         continue;
 526                 if (sockfd >= FD_SETSIZE) {
 527                         error("too large socket descriptor.");
 528                         close(sockfd);
 529                         continue;
 530                 }
 531
 532 #ifdef IPV6_V6ONLY
 533                 if (ai->ai_family == AF_INET6) {
 534                         int on = 1;
 535                         setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
 536                                    &on, sizeof(on));
 537                         /* Note: error is not fatal */
 538                 }
 539 #endif
 540
 541                 if (set_reuse_addr(sockfd)) {
 542                         close(sockfd);
 543                         continue;
 544                 }
 545
 546                 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 547                         close(sockfd);
 548                         continue;       /* not fatal */
 549                 }
 550                 if (listen(sockfd, 5) < 0) {
 551                         close(sockfd);
 552                         continue;       /* not fatal */
 553                 }
 554
 555                 newlist = realloc(socklist, sizeof(int) * (socknum + 1));
 556                 if (!newlist)
 557                         die("memory allocation failed: %s", strerror(errno));
 558
 559                 socklist = newlist;
 560                 socklist[socknum++] = sockfd;
 561
 562                 if (maxfd < sockfd)
 563                         maxfd = sockfd;
 564         }
 565
 566         freeaddrinfo(ai0);
 567
 568         *socklist_p = socklist;
 569         return socknum;
 570 }
 571
 572 #else /* NO_IPV6 */
 573
 574 static int socksetup(int port, int **socklist_p)
 575 {
 576         struct sockaddr_in sin;
 577         int sockfd;
 578
 579         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 580         if (sockfd < 0)
 581                 return 0;
 582
 583         memset(&sin, 0, sizeof sin);
 584         sin.sin_family = AF_INET;
 585         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 586         sin.sin_port = htons(port);
 587
 588         if (set_reuse_addr(sockfd)) {
 589                 close(sockfd);
 590                 return 0;
 591         }
 592
 593         if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
 594                 close(sockfd);
 595                 return 0;
 596         }
 597
 598         if (listen(sockfd, 5) < 0) {
 599                 close(sockfd);
 600                 return 0;
 601         }
 602
 603         *socklist_p = xmalloc(sizeof(int));
 604         **socklist_p = sockfd;
 605         return 1;
 606 }
 607
 608 #endif
 609
 610 static int service_loop(int socknum, int *socklist)
 611 {
 612         struct pollfd *pfd;
 613         int i;
 614
 615         pfd = xcalloc(socknum, sizeof(struct pollfd));
 616
 617         for (i = 0; i < socknum; i++) {
 618                 pfd[i].fd = socklist[i];
 619                 pfd[i].events = POLLIN;
 620         }
 621
 622         signal(SIGCHLD, child_handler);
 623
 624         for (;;) {
 625                 int i;
 626
 627                 if (poll(pfd, socknum, -1) < 0) {
 628                         if (errno != EINTR) {
 629                                 error("poll failed, resuming: %s",
 630                                       strerror(errno));
 631                                 sleep(1);
 632                         }
 633                         continue;
 634                 }
 635
 636                 for (i = 0; i < socknum; i++) {
 637                         if (pfd[i].revents & POLLIN) {
 638                                 struct sockaddr_storage ss;
 639                                 unsigned int sslen = sizeof(ss);
 640                                 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
 641                                 if (incoming < 0) {
 642                                         switch (errno) {
 643                                         case EAGAIN:
 644                                         case EINTR:
 645                                         case ECONNABORTED:
 646                                                 continue;
 647                                         default:
 648                                                 die("accept returned %s", strerror(errno));
 649                                         }
 650                                 }
 651                                 handle(incoming, (struct sockaddr *)&ss, sslen);
 652                         }
 653                 }
 654         }
 655 }
 656
 657 static int serve(int port)
 658 {
 659         int socknum, *socklist;
 660
 661         socknum = socksetup(port, &socklist);
 662         if (socknum == 0)
 663                 die("unable to allocate any listen sockets on port %u", port);
 664
 665         return service_loop(socknum, socklist);
 666 }
 667
 668 int main(int argc, char **argv)
 669 {
 670         int port = DEFAULT_GIT_PORT;
 671         int inetd_mode = 0;
 672         int i;
 673
 674         for (i = 1; i < argc; i++) {
 675                 char *arg = argv[i];
 676
 677                 if (!strncmp(arg, "--port=", 7)) {
 678                         char *end;
 679                         unsigned long n;
 680                         n = strtoul(arg+7, &end, 0);
 681                         if (arg[7] && !*end) {
 682                                 port = n;
 683                                 continue;
 684                         }
 685                 }
 686                 if (!strcmp(arg, "--inetd")) {
 687                         inetd_mode = 1;
 688                         log_syslog = 1;
 689                         continue;
 690                 }
 691                 if (!strcmp(arg, "--verbose")) {
 692                         verbose = 1;
 693                         continue;
 694                 }
 695                 if (!strcmp(arg, "--syslog")) {
 696                         log_syslog = 1;
 697                         continue;
 698                 }
 699                 if (!strcmp(arg, "--export-all")) {
 700                         export_all_trees = 1;
 701                         continue;
 702                 }
 703                 if (!strncmp(arg, "--timeout=", 10)) {
 704                         timeout = atoi(arg+10);
 705                         continue;
 706                 }
 707                 if (!strncmp(arg, "--init-timeout=", 15)) {
 708                         init_timeout = atoi(arg+15);
 709                         continue;
 710                 }
 711                 if (!strcmp(arg, "--strict-paths")) {
 712                         strict_paths = 1;
 713                         continue;
 714                 }
 715                 if (!strncmp(arg, "--base-path=", 12)) {
 716                         base_path = arg+12;
 717                         continue;
 718                 }
 719                 if (!strcmp(arg, "--reuseaddr")) {
 720                         reuseaddr = 1;
 721                         continue;
 722                 }
 723                 if (!strcmp(arg, "--user-path")) {
 724                         user_path = "";
 725                         continue;
 726                 }
 727                 if (!strncmp(arg, "--user-path=", 12)) {
 728                         user_path = arg + 12;
 729                         continue;
 730                 }
 731                 if (!strcmp(arg, "--")) {
 732                         ok_paths = &argv[i+1];
 733                         break;
 734                 } else if (arg[0] != '-') {
 735                         ok_paths = &argv[i];
 736                         break;
 737                 }
 738
 739                 usage(daemon_usage);
 740         }
 741
 742         if (log_syslog)
 743                 openlog("git-daemon", 0, LOG_DAEMON);
 744
 745         if (strict_paths && (!ok_paths || !*ok_paths)) {
 746                 if (!inetd_mode)
 747                         die("git-daemon: option --strict-paths requires a whitelist");
 748
 749                 logerror("option --strict-paths requires a whitelist");
 750                 exit (1);
 751         }
 752
 753         if (inetd_mode) {
 754                 fclose(stderr); //FIXME: workaround
 755                 return execute();
 756         }
 757
 758         return serve(port);
 759 }