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] [--detach] [--pid-file=file] [directory...]";
  23
  24 /* List of acceptable pathname prefixes */
  25 static char **ok_paths;
  26 static int strict_paths;
  27
  28 /* If this is set, git-daemon-export-ok is not required */
  29 static int export_all_trees;
  30
  31 /* Take all paths relative to this one if non-NULL */
  32 static char *base_path;
  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 const char *user_path;
  39
  40 /* Timeout, and initial timeout */
  41 static unsigned int timeout;
  42 static unsigned int init_timeout;
  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 void NORETURN daemon_die(const char *err, va_list params)
  99 {
 100         logreport(LOG_ERR, err, params);
 101         exit(1);
 102 }
 103
 104 static int avoid_alias(char *p)
 105 {
 106         int sl, ndot;
 107
 108         /*
 109          * This resurrects the belts and suspenders paranoia check by HPA
 110          * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
 111          * does not do getcwd() based path canonicalizations.
 112          *
 113          * sl becomes true immediately after seeing '/' and continues to
 114          * be true as long as dots continue after that without intervening
 115          * non-dot character.
 116          */
 117         if (!p || (*p != '/' && *p != '~'))
 118                 return -1;
 119         sl = 1; ndot = 0;
 120         p++;
 121
 122         while (1) {
 123                 char ch = *p++;
 124                 if (sl) {
 125                         if (ch == '.')
 126                                 ndot++;
 127                         else if (ch == '/') {
 128                                 if (ndot < 3)
 129                                         /* reject //, /./ and /../ */
 130                                         return -1;
 131                                 ndot = 0;
 132                         }
 133                         else if (ch == 0) {
 134                                 if (0 < ndot && ndot < 3)
 135                                         /* reject /.$ and /..$ */
 136                                         return -1;
 137                                 return 0;
 138                         }
 139                         else
 140                                 sl = ndot = 0;
 141                 }
 142                 else if (ch == 0)
 143                         return 0;
 144                 else if (ch == '/') {
 145                         sl = 1;
 146                         ndot = 0;
 147                 }
 148         }
 149 }
 150
 151 static char *path_ok(char *dir)
 152 {
 153         static char rpath[PATH_MAX];
 154         char *path;
 155
 156         if (avoid_alias(dir)) {
 157                 logerror("'%s': aliased", dir);
 158                 return NULL;
 159         }
 160
 161         if (*dir == '~') {
 162                 if (!user_path) {
 163                         logerror("'%s': User-path not allowed", dir);
 164                         return NULL;
 165                 }
 166                 if (*user_path) {
 167                         /* Got either "~alice" or "~alice/foo";
 168                          * rewrite them to "~alice/%s" or
 169                          * "~alice/%s/foo".
 170                          */
 171                         int namlen, restlen = strlen(dir);
 172                         char *slash = strchr(dir, '/');
 173                         if (!slash)
 174                                 slash = dir + restlen;
 175                         namlen = slash - dir;
 176                         restlen -= namlen;
 177                         loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
 178                         snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
 179                                  namlen, dir, user_path, restlen, slash);
 180                         dir = rpath;
 181                 }
 182         }
 183         else if (base_path) {
 184                 if (*dir != '/') {
 185                         /* Allow only absolute */
 186                         logerror("'%s': Non-absolute path denied (base-path active)", dir);
 187                         return NULL;
 188                 }
 189                 else {
 190                         snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
 191                         dir = rpath;
 192                 }
 193         }
 194
 195         path = enter_repo(dir, strict_paths);
 196
 197         if (!path) {
 198                 logerror("'%s': unable to chdir or not a git archive", dir);
 199                 return NULL;
 200         }
 201
 202         if ( ok_paths && *ok_paths ) {
 203                 char **pp;
 204                 int pathlen = strlen(path);
 205
 206                 /* The validation is done on the paths after enter_repo
 207                  * appends optional {.git,.git/.git} and friends, but
 208                  * it does not use getcwd().  So if your /pub is
 209                  * a symlink to /mnt/pub, you can whitelist /pub and
 210                  * do not have to say /mnt/pub.
 211                  * Do not say /pub/.
 212                  */
 213                 for ( pp = ok_paths ; *pp ; pp++ ) {
 214                         int len = strlen(*pp);
 215                         if (len <= pathlen &&
 216                             !memcmp(*pp, path, len) &&
 217                             (path[len] == '\0' ||
 218                              (!strict_paths && path[len] == '/')))
 219                                 return path;
 220                 }
 221         }
 222         else {
 223                 /* be backwards compatible */
 224                 if (!strict_paths)
 225                         return path;
 226         }
 227
 228         logerror("'%s': not in whitelist", path);
 229         return NULL;            /* Fallthrough. Deny by default */
 230 }
 231
 232 static int upload(char *dir)
 233 {
 234         /* Timeout as string */
 235         char timeout_buf[64];
 236         const char *path;
 237
 238         loginfo("Request for '%s'", dir);
 239
 240         if (!(path = path_ok(dir)))
 241                 return -1;
 242
 243         /*
 244          * Security on the cheap.
 245          *
 246          * We want a readable HEAD, usable "objects" directory, and
 247          * a "git-daemon-export-ok" flag that says that the other side
 248          * is ok with us doing this.
 249          *
 250          * path_ok() uses enter_repo() and does whitelist checking.
 251          * We only need to make sure the repository is exported.
 252          */
 253
 254         if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
 255                 logerror("'%s': repository not exported.", path);
 256                 errno = EACCES;
 257                 return -1;
 258         }
 259
 260         /*
 261          * We'll ignore SIGTERM from now on, we have a
 262          * good client.
 263          */
 264         signal(SIGTERM, SIG_IGN);
 265
 266         snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
 267
 268         /* git-upload-pack only ever reads stuff, so this is safe */
 269         execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
 270         return -1;
 271 }
 272
 273 static int execute(struct sockaddr *addr)
 274 {
 275         static char line[1000];
 276         int pktlen, len;
 277
 278         if (addr) {
 279                 char addrbuf[256] = "";
 280                 int port = -1;
 281
 282                 if (addr->sa_family == AF_INET) {
 283                         struct sockaddr_in *sin_addr = (void *) addr;
 284                         inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
 285                         port = sin_addr->sin_port;
 286 #ifndef NO_IPV6
 287                 } else if (addr && addr->sa_family == AF_INET6) {
 288                         struct sockaddr_in6 *sin6_addr = (void *) addr;
 289
 290                         char *buf = addrbuf;
 291                         *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
 292                         inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
 293                         strcat(buf, "]");
 294
 295                         port = sin6_addr->sin6_port;
 296 #endif
 297                 }
 298                 loginfo("Connection from %s:%d", addrbuf, port);
 299         }
 300
 301         alarm(init_timeout ? init_timeout : timeout);
 302         pktlen = packet_read_line(0, line, sizeof(line));
 303         alarm(0);
 304
 305         len = strlen(line);
 306         if (pktlen != len)
 307                 loginfo("Extended attributes (%d bytes) exist <%.*s>",
 308                         (int) pktlen - len,
 309                         (int) pktlen - len, line + len + 1);
 310         if (len && line[len-1] == '\n')
 311                 line[--len] = 0;
 312
 313         if (!strncmp("git-upload-pack ", line, 16))
 314                 return upload(line+16);
 315
 316         logerror("Protocol error: '%s'", line);
 317         return -1;
 318 }
 319
 320
 321 /*
 322  * We count spawned/reaped separately, just to avoid any
 323  * races when updating them from signals. The SIGCHLD handler
 324  * will only update children_reaped, and the fork logic will
 325  * only update children_spawned.
 326  *
 327  * MAX_CHILDREN should be a power-of-two to make the modulus
 328  * operation cheap. It should also be at least twice
 329  * the maximum number of connections we will ever allow.
 330  */
 331 #define MAX_CHILDREN 128
 332
 333 static int max_connections = 25;
 334
 335 /* These are updated by the signal handler */
 336 static volatile unsigned int children_reaped;
 337 static pid_t dead_child[MAX_CHILDREN];
 338
 339 /* These are updated by the main loop */
 340 static unsigned int children_spawned;
 341 static unsigned int children_deleted;
 342
 343 static struct child {
 344         pid_t pid;
 345         int addrlen;
 346         struct sockaddr_storage address;
 347 } live_child[MAX_CHILDREN];
 348
 349 static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
 350 {
 351         live_child[idx].pid = pid;
 352         live_child[idx].addrlen = addrlen;
 353         memcpy(&live_child[idx].address, addr, addrlen);
 354 }
 355
 356 /*
 357  * Walk from "deleted" to "spawned", and remove child "pid".
 358  *
 359  * We move everything up by one, since the new "deleted" will
 360  * be one higher.
 361  */
 362 static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
 363 {
 364         struct child n;
 365
 366         deleted %= MAX_CHILDREN;
 367         spawned %= MAX_CHILDREN;
 368         if (live_child[deleted].pid == pid) {
 369                 live_child[deleted].pid = -1;
 370                 return;
 371         }
 372         n = live_child[deleted];
 373         for (;;) {
 374                 struct child m;
 375                 deleted = (deleted + 1) % MAX_CHILDREN;
 376                 if (deleted == spawned)
 377                         die("could not find dead child %d\n", pid);
 378                 m = live_child[deleted];
 379                 live_child[deleted] = n;
 380                 if (m.pid == pid)
 381                         return;
 382                 n = m;
 383         }
 384 }
 385
 386 /*
 387  * This gets called if the number of connections grows
 388  * past "max_connections".
 389  *
 390  * We _should_ start off by searching for connections
 391  * from the same IP, and if there is some address wth
 392  * multiple connections, we should kill that first.
 393  *
 394  * As it is, we just "randomly" kill 25% of the connections,
 395  * and our pseudo-random generator sucks too. I have no
 396  * shame.
 397  *
 398  * Really, this is just a place-holder for a _real_ algorithm.
 399  */
 400 static void kill_some_children(int signo, unsigned start, unsigned stop)
 401 {
 402         start %= MAX_CHILDREN;
 403         stop %= MAX_CHILDREN;
 404         while (start != stop) {
 405                 if (!(start & 3))
 406                         kill(live_child[start].pid, signo);
 407                 start = (start + 1) % MAX_CHILDREN;
 408         }
 409 }
 410
 411 static void check_max_connections(void)
 412 {
 413         for (;;) {
 414                 int active;
 415                 unsigned spawned, reaped, deleted;
 416
 417                 spawned = children_spawned;
 418                 reaped = children_reaped;
 419                 deleted = children_deleted;
 420
 421                 while (deleted < reaped) {
 422                         pid_t pid = dead_child[deleted % MAX_CHILDREN];
 423                         remove_child(pid, deleted, spawned);
 424                         deleted++;
 425                 }
 426                 children_deleted = deleted;
 427
 428                 active = spawned - deleted;
 429                 if (active <= max_connections)
 430                         break;
 431
 432                 /* Kill some unstarted connections with SIGTERM */
 433                 kill_some_children(SIGTERM, deleted, spawned);
 434                 if (active <= max_connections << 1)
 435                         break;
 436
 437                 /* If the SIGTERM thing isn't helping use SIGKILL */
 438                 kill_some_children(SIGKILL, deleted, spawned);
 439                 sleep(1);
 440         }
 441 }
 442
 443 static void handle(int incoming, struct sockaddr *addr, int addrlen)
 444 {
 445         pid_t pid = fork();
 446
 447         if (pid) {
 448                 unsigned idx;
 449
 450                 close(incoming);
 451                 if (pid < 0)
 452                         return;
 453
 454                 idx = children_spawned % MAX_CHILDREN;
 455                 children_spawned++;
 456                 add_child(idx, pid, addr, addrlen);
 457
 458                 check_max_connections();
 459                 return;
 460         }
 461
 462         dup2(incoming, 0);
 463         dup2(incoming, 1);
 464         close(incoming);
 465
 466         exit(execute(addr));
 467 }
 468
 469 static void child_handler(int signo)
 470 {
 471         for (;;) {
 472                 int status;
 473                 pid_t pid = waitpid(-1, &status, WNOHANG);
 474
 475                 if (pid > 0) {
 476                         unsigned reaped = children_reaped;
 477                         dead_child[reaped % MAX_CHILDREN] = pid;
 478                         children_reaped = reaped + 1;
 479                         /* XXX: Custom logging, since we don't wanna getpid() */
 480                         if (verbose) {
 481                                 const char *dead = "";
 482                                 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 483                                         dead = " (with error)";
 484                                 if (log_syslog)
 485                                         syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
 486                                 else
 487                                         fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
 488                         }
 489                         continue;
 490                 }
 491                 break;
 492         }
 493 }
 494
 495 static int set_reuse_addr(int sockfd)
 496 {
 497         int on = 1;
 498
 499         if (!reuseaddr)
 500                 return 0;
 501         return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
 502                           &on, sizeof(on));
 503 }
 504
 505 #ifndef NO_IPV6
 506
 507 static int socksetup(int port, int **socklist_p)
 508 {
 509         int socknum = 0, *socklist = NULL;
 510         int maxfd = -1;
 511         char pbuf[NI_MAXSERV];
 512
 513         struct addrinfo hints, *ai0, *ai;
 514         int gai;
 515
 516         sprintf(pbuf, "%d", port);
 517         memset(&hints, 0, sizeof(hints));
 518         hints.ai_family = AF_UNSPEC;
 519         hints.ai_socktype = SOCK_STREAM;
 520         hints.ai_protocol = IPPROTO_TCP;
 521         hints.ai_flags = AI_PASSIVE;
 522
 523         gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
 524         if (gai)
 525                 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
 526
 527         for (ai = ai0; ai; ai = ai->ai_next) {
 528                 int sockfd;
 529                 int *newlist;
 530
 531                 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 532                 if (sockfd < 0)
 533                         continue;
 534                 if (sockfd >= FD_SETSIZE) {
 535                         error("too large socket descriptor.");
 536                         close(sockfd);
 537                         continue;
 538                 }
 539
 540 #ifdef IPV6_V6ONLY
 541                 if (ai->ai_family == AF_INET6) {
 542                         int on = 1;
 543                         setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
 544                                    &on, sizeof(on));
 545                         /* Note: error is not fatal */
 546                 }
 547 #endif
 548
 549                 if (set_reuse_addr(sockfd)) {
 550                         close(sockfd);
 551                         continue;
 552                 }
 553
 554                 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 555                         close(sockfd);
 556                         continue;       /* not fatal */
 557                 }
 558                 if (listen(sockfd, 5) < 0) {
 559                         close(sockfd);
 560                         continue;       /* not fatal */
 561                 }
 562
 563                 newlist = realloc(socklist, sizeof(int) * (socknum + 1));
 564                 if (!newlist)
 565                         die("memory allocation failed: %s", strerror(errno));
 566
 567                 socklist = newlist;
 568                 socklist[socknum++] = sockfd;
 569
 570                 if (maxfd < sockfd)
 571                         maxfd = sockfd;
 572         }
 573
 574         freeaddrinfo(ai0);
 575
 576         *socklist_p = socklist;
 577         return socknum;
 578 }
 579
 580 #else /* NO_IPV6 */
 581
 582 static int socksetup(int port, int **socklist_p)
 583 {
 584         struct sockaddr_in sin;
 585         int sockfd;
 586
 587         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 588         if (sockfd < 0)
 589                 return 0;
 590
 591         memset(&sin, 0, sizeof sin);
 592         sin.sin_family = AF_INET;
 593         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 594         sin.sin_port = htons(port);
 595
 596         if (set_reuse_addr(sockfd)) {
 597                 close(sockfd);
 598                 return 0;
 599         }
 600
 601         if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
 602                 close(sockfd);
 603                 return 0;
 604         }
 605
 606         if (listen(sockfd, 5) < 0) {
 607                 close(sockfd);
 608                 return 0;
 609         }
 610
 611         *socklist_p = xmalloc(sizeof(int));
 612         **socklist_p = sockfd;
 613         return 1;
 614 }
 615
 616 #endif
 617
 618 static int service_loop(int socknum, int *socklist)
 619 {
 620         struct pollfd *pfd;
 621         int i;
 622
 623         pfd = xcalloc(socknum, sizeof(struct pollfd));
 624
 625         for (i = 0; i < socknum; i++) {
 626                 pfd[i].fd = socklist[i];
 627                 pfd[i].events = POLLIN;
 628         }
 629
 630         signal(SIGCHLD, child_handler);
 631
 632         for (;;) {
 633                 int i;
 634
 635                 if (poll(pfd, socknum, -1) < 0) {
 636                         if (errno != EINTR) {
 637                                 error("poll failed, resuming: %s",
 638                                       strerror(errno));
 639                                 sleep(1);
 640                         }
 641                         continue;
 642                 }
 643
 644                 for (i = 0; i < socknum; i++) {
 645                         if (pfd[i].revents & POLLIN) {
 646                                 struct sockaddr_storage ss;
 647                                 unsigned int sslen = sizeof(ss);
 648                                 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
 649                                 if (incoming < 0) {
 650                                         switch (errno) {
 651                                         case EAGAIN:
 652                                         case EINTR:
 653                                         case ECONNABORTED:
 654                                                 continue;
 655                                         default:
 656                                                 die("accept returned %s", strerror(errno));
 657                                         }
 658                                 }
 659                                 handle(incoming, (struct sockaddr *)&ss, sslen);
 660                         }
 661                 }
 662         }
 663 }
 664
 665 /* if any standard file descriptor is missing open it to /dev/null */
 666 static void sanitize_stdfds(void)
 667 {
 668         int fd = open("/dev/null", O_RDWR, 0);
 669         while (fd != -1 && fd < 2)
 670                 fd = dup(fd);
 671         if (fd == -1)
 672                 die("open /dev/null or dup failed: %s", strerror(errno));
 673         if (fd > 2)
 674                 close(fd);
 675 }
 676
 677 static void daemonize(void)
 678 {
 679         switch (fork()) {
 680                 case 0:
 681                         break;
 682                 case -1:
 683                         die("fork failed: %s", strerror(errno));
 684                 default:
 685                         exit(0);
 686         }
 687         if (setsid() == -1)
 688                 die("setsid failed: %s", strerror(errno));
 689         close(0);
 690         close(1);
 691         close(2);
 692         sanitize_stdfds();
 693 }
 694
 695 static void store_pid(const char *path)
 696 {
 697         FILE *f = fopen(path, "w");
 698         if (!f)
 699                 die("cannot open pid file %s: %s", path, strerror(errno));
 700         fprintf(f, "%d\n", getpid());
 701         fclose(f);
 702 }
 703
 704 static int serve(int port)
 705 {
 706         int socknum, *socklist;
 707
 708         socknum = socksetup(port, &socklist);
 709         if (socknum == 0)
 710                 die("unable to allocate any listen sockets on port %u", port);
 711
 712         return service_loop(socknum, socklist);
 713 }
 714
 715 int main(int argc, char **argv)
 716 {
 717         int port = DEFAULT_GIT_PORT;
 718         int inetd_mode = 0;
 719         const char *pid_file = NULL;
 720         int detach = 0;
 721         int i;
 722
 723         /* Without this we cannot rely on waitpid() to tell
 724          * what happened to our children.
 725          */
 726         signal(SIGCHLD, SIG_DFL);
 727
 728         for (i = 1; i < argc; i++) {
 729                 char *arg = argv[i];
 730
 731                 if (!strncmp(arg, "--port=", 7)) {
 732                         char *end;
 733                         unsigned long n;
 734                         n = strtoul(arg+7, &end, 0);
 735                         if (arg[7] && !*end) {
 736                                 port = n;
 737                                 continue;
 738                         }
 739                 }
 740                 if (!strcmp(arg, "--inetd")) {
 741                         inetd_mode = 1;
 742                         log_syslog = 1;
 743                         continue;
 744                 }
 745                 if (!strcmp(arg, "--verbose")) {
 746                         verbose = 1;
 747                         continue;
 748                 }
 749                 if (!strcmp(arg, "--syslog")) {
 750                         log_syslog = 1;
 751                         continue;
 752                 }
 753                 if (!strcmp(arg, "--export-all")) {
 754                         export_all_trees = 1;
 755                         continue;
 756                 }
 757                 if (!strncmp(arg, "--timeout=", 10)) {
 758                         timeout = atoi(arg+10);
 759                         continue;
 760                 }
 761                 if (!strncmp(arg, "--init-timeout=", 15)) {
 762                         init_timeout = atoi(arg+15);
 763                         continue;
 764                 }
 765                 if (!strcmp(arg, "--strict-paths")) {
 766                         strict_paths = 1;
 767                         continue;
 768                 }
 769                 if (!strncmp(arg, "--base-path=", 12)) {
 770                         base_path = arg+12;
 771                         continue;
 772                 }
 773                 if (!strcmp(arg, "--reuseaddr")) {
 774                         reuseaddr = 1;
 775                         continue;
 776                 }
 777                 if (!strcmp(arg, "--user-path")) {
 778                         user_path = "";
 779                         continue;
 780                 }
 781                 if (!strncmp(arg, "--user-path=", 12)) {
 782                         user_path = arg + 12;
 783                         continue;
 784                 }
 785                 if (!strncmp(arg, "--pid-file=", 11)) {
 786                         pid_file = arg + 11;
 787                         continue;
 788                 }
 789                 if (!strcmp(arg, "--detach")) {
 790                         detach = 1;
 791                         log_syslog = 1;
 792                         continue;
 793                 }
 794                 if (!strcmp(arg, "--")) {
 795                         ok_paths = &argv[i+1];
 796                         break;
 797                 } else if (arg[0] != '-') {
 798                         ok_paths = &argv[i];
 799                         break;
 800                 }
 801
 802                 usage(daemon_usage);
 803         }
 804
 805         if (log_syslog) {
 806                 openlog("git-daemon", 0, LOG_DAEMON);
 807                 set_die_routine(daemon_die);
 808         }
 809
 810         if (strict_paths && (!ok_paths || !*ok_paths))
 811                 die("option --strict-paths requires a whitelist");
 812
 813         if (inetd_mode) {
 814                 struct sockaddr_storage ss;
 815                 struct sockaddr *peer = (struct sockaddr *)&ss;
 816                 socklen_t slen = sizeof(ss);
 817
 818                 freopen("/dev/null", "w", stderr);
 819
 820                 if (getpeername(0, peer, &slen))
 821                         peer = NULL;
 822
 823                 return execute(peer);
 824         }
 825
 826         if (detach)
 827                 daemonize();
 828         else
 829                 sanitize_stdfds();
 830
 831         if (pid_file)
 832                 store_pid(pid_file);
 833
 834         return serve(port);
 835 }