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 <pwd.h>
  11 #include <grp.h>
  12 #include "pkt-line.h"
  13 #include "cache.h"
  14 #include "exec_cmd.h"
  15
  16 static int log_syslog;
  17 static int verbose;
  18 static int reuseaddr;
  19
  20 static const char daemon_usage[] =
  21 "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
  22 "           [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
  23 "           [--base-path=path] [--user-path | --user-path=path]\n"
  24 "           [--reuseaddr] [--detach] [--pid-file=file]\n"
  25 "           [--user=user [[--group=group]] [directory...]";
  26
  27 /* List of acceptable pathname prefixes */
  28 static char **ok_paths;
  29 static int strict_paths;
  30
  31 /* If this is set, git-daemon-export-ok is not required */
  32 static int export_all_trees;
  33
  34 /* Take all paths relative to this one if non-NULL */
  35 static char *base_path;
  36
  37 /* If defined, ~user notation is allowed and the string is inserted
  38  * after ~user/.  E.g. a request to git://host/~alice/frotz would
  39  * go to /home/alice/pub_git/frotz with --user-path=pub_git.
  40  */
  41 static const char *user_path;
  42
  43 /* Timeout, and initial timeout */
  44 static unsigned int timeout;
  45 static unsigned int init_timeout;
  46
  47 static void logreport(int priority, const char *err, va_list params)
  48 {
  49         /* We should do a single write so that it is atomic and output
  50          * of several processes do not get intermingled. */
  51         char buf[1024];
  52         int buflen;
  53         int maxlen, msglen;
  54
  55         /* sizeof(buf) should be big enough for "[pid] \n" */
  56         buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
  57
  58         maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
  59         msglen = vsnprintf(buf + buflen, maxlen, err, params);
  60
  61         if (log_syslog) {
  62                 syslog(priority, "%s", buf);
  63                 return;
  64         }
  65
  66         /* maxlen counted our own LF but also counts space given to
  67          * vsnprintf for the terminating NUL.  We want to make sure that
  68          * we have space for our own LF and NUL after the "meat" of the
  69          * message, so truncate it at maxlen - 1.
  70          */
  71         if (msglen > maxlen - 1)
  72                 msglen = maxlen - 1;
  73         else if (msglen < 0)
  74                 msglen = 0; /* Protect against weird return values. */
  75         buflen += msglen;
  76
  77         buf[buflen++] = '\n';
  78         buf[buflen] = '\0';
  79
  80         write(2, buf, buflen);
  81 }
  82
  83 static void logerror(const char *err, ...)
  84 {
  85         va_list params;
  86         va_start(params, err);
  87         logreport(LOG_ERR, err, params);
  88         va_end(params);
  89 }
  90
  91 static void loginfo(const char *err, ...)
  92 {
  93         va_list params;
  94         if (!verbose)
  95                 return;
  96         va_start(params, err);
  97         logreport(LOG_INFO, err, params);
  98         va_end(params);
  99 }
 100
 101 static void NORETURN daemon_die(const char *err, va_list params)
 102 {
 103         logreport(LOG_ERR, err, params);
 104         exit(1);
 105 }
 106
 107 static int avoid_alias(char *p)
 108 {
 109         int sl, ndot;
 110
 111         /*
 112          * This resurrects the belts and suspenders paranoia check by HPA
 113          * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
 114          * does not do getcwd() based path canonicalizations.
 115          *
 116          * sl becomes true immediately after seeing '/' and continues to
 117          * be true as long as dots continue after that without intervening
 118          * non-dot character.
 119          */
 120         if (!p || (*p != '/' && *p != '~'))
 121                 return -1;
 122         sl = 1; ndot = 0;
 123         p++;
 124
 125         while (1) {
 126                 char ch = *p++;
 127                 if (sl) {
 128                         if (ch == '.')
 129                                 ndot++;
 130                         else if (ch == '/') {
 131                                 if (ndot < 3)
 132                                         /* reject //, /./ and /../ */
 133                                         return -1;
 134                                 ndot = 0;
 135                         }
 136                         else if (ch == 0) {
 137                                 if (0 < ndot && ndot < 3)
 138                                         /* reject /.$ and /..$ */
 139                                         return -1;
 140                                 return 0;
 141                         }
 142                         else
 143                                 sl = ndot = 0;
 144                 }
 145                 else if (ch == 0)
 146                         return 0;
 147                 else if (ch == '/') {
 148                         sl = 1;
 149                         ndot = 0;
 150                 }
 151         }
 152 }
 153
 154 static char *path_ok(char *dir)
 155 {
 156         static char rpath[PATH_MAX];
 157         char *path;
 158
 159         if (avoid_alias(dir)) {
 160                 logerror("'%s': aliased", dir);
 161                 return NULL;
 162         }
 163
 164         if (*dir == '~') {
 165                 if (!user_path) {
 166                         logerror("'%s': User-path not allowed", dir);
 167                         return NULL;
 168                 }
 169                 if (*user_path) {
 170                         /* Got either "~alice" or "~alice/foo";
 171                          * rewrite them to "~alice/%s" or
 172                          * "~alice/%s/foo".
 173                          */
 174                         int namlen, restlen = strlen(dir);
 175                         char *slash = strchr(dir, '/');
 176                         if (!slash)
 177                                 slash = dir + restlen;
 178                         namlen = slash - dir;
 179                         restlen -= namlen;
 180                         loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
 181                         snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
 182                                  namlen, dir, user_path, restlen, slash);
 183                         dir = rpath;
 184                 }
 185         }
 186         else if (base_path) {
 187                 if (*dir != '/') {
 188                         /* Allow only absolute */
 189                         logerror("'%s': Non-absolute path denied (base-path active)", dir);
 190                         return NULL;
 191                 }
 192                 else {
 193                         snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
 194                         dir = rpath;
 195                 }
 196         }
 197
 198         path = enter_repo(dir, strict_paths);
 199
 200         if (!path) {
 201                 logerror("'%s': unable to chdir or not a git archive", dir);
 202                 return NULL;
 203         }
 204
 205         if ( ok_paths && *ok_paths ) {
 206                 char **pp;
 207                 int pathlen = strlen(path);
 208
 209                 /* The validation is done on the paths after enter_repo
 210                  * appends optional {.git,.git/.git} and friends, but
 211                  * it does not use getcwd().  So if your /pub is
 212                  * a symlink to /mnt/pub, you can whitelist /pub and
 213                  * do not have to say /mnt/pub.
 214                  * Do not say /pub/.
 215                  */
 216                 for ( pp = ok_paths ; *pp ; pp++ ) {
 217                         int len = strlen(*pp);
 218                         if (len <= pathlen &&
 219                             !memcmp(*pp, path, len) &&
 220                             (path[len] == '\0' ||
 221                              (!strict_paths && path[len] == '/')))
 222                                 return path;
 223                 }
 224         }
 225         else {
 226                 /* be backwards compatible */
 227                 if (!strict_paths)
 228                         return path;
 229         }
 230
 231         logerror("'%s': not in whitelist", path);
 232         return NULL;            /* Fallthrough. Deny by default */
 233 }
 234
 235 static int upload(char *dir)
 236 {
 237         /* Timeout as string */
 238         char timeout_buf[64];
 239         const char *path;
 240
 241         loginfo("Request for '%s'", dir);
 242
 243         if (!(path = path_ok(dir)))
 244                 return -1;
 245
 246         /*
 247          * Security on the cheap.
 248          *
 249          * We want a readable HEAD, usable "objects" directory, and
 250          * a "git-daemon-export-ok" flag that says that the other side
 251          * is ok with us doing this.
 252          *
 253          * path_ok() uses enter_repo() and does whitelist checking.
 254          * We only need to make sure the repository is exported.
 255          */
 256
 257         if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
 258                 logerror("'%s': repository not exported.", path);
 259                 errno = EACCES;
 260                 return -1;
 261         }
 262
 263         /*
 264          * We'll ignore SIGTERM from now on, we have a
 265          * good client.
 266          */
 267         signal(SIGTERM, SIG_IGN);
 268
 269         snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
 270
 271         /* git-upload-pack only ever reads stuff, so this is safe */
 272         execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
 273         return -1;
 274 }
 275
 276 static int execute(struct sockaddr *addr)
 277 {
 278         static char line[1000];
 279         int pktlen, len;
 280
 281         if (addr) {
 282                 char addrbuf[256] = "";
 283                 int port = -1;
 284
 285                 if (addr->sa_family == AF_INET) {
 286                         struct sockaddr_in *sin_addr = (void *) addr;
 287                         inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
 288                         port = sin_addr->sin_port;
 289 #ifndef NO_IPV6
 290                 } else if (addr && addr->sa_family == AF_INET6) {
 291                         struct sockaddr_in6 *sin6_addr = (void *) addr;
 292
 293                         char *buf = addrbuf;
 294                         *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
 295                         inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
 296                         strcat(buf, "]");
 297
 298                         port = sin6_addr->sin6_port;
 299 #endif
 300                 }
 301                 loginfo("Connection from %s:%d", addrbuf, port);
 302         }
 303
 304         alarm(init_timeout ? init_timeout : timeout);
 305         pktlen = packet_read_line(0, line, sizeof(line));
 306         alarm(0);
 307
 308         len = strlen(line);
 309         if (pktlen != len)
 310                 loginfo("Extended attributes (%d bytes) exist <%.*s>",
 311                         (int) pktlen - len,
 312                         (int) pktlen - len, line + len + 1);
 313         if (len && line[len-1] == '\n')
 314                 line[--len] = 0;
 315
 316         if (!strncmp("git-upload-pack ", line, 16))
 317                 return upload(line+16);
 318
 319         logerror("Protocol error: '%s'", line);
 320         return -1;
 321 }
 322
 323
 324 /*
 325  * We count spawned/reaped separately, just to avoid any
 326  * races when updating them from signals. The SIGCHLD handler
 327  * will only update children_reaped, and the fork logic will
 328  * only update children_spawned.
 329  *
 330  * MAX_CHILDREN should be a power-of-two to make the modulus
 331  * operation cheap. It should also be at least twice
 332  * the maximum number of connections we will ever allow.
 333  */
 334 #define MAX_CHILDREN 128
 335
 336 static int max_connections = 25;
 337
 338 /* These are updated by the signal handler */
 339 static volatile unsigned int children_reaped;
 340 static pid_t dead_child[MAX_CHILDREN];
 341
 342 /* These are updated by the main loop */
 343 static unsigned int children_spawned;
 344 static unsigned int children_deleted;
 345
 346 static struct child {
 347         pid_t pid;
 348         int addrlen;
 349         struct sockaddr_storage address;
 350 } live_child[MAX_CHILDREN];
 351
 352 static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
 353 {
 354         live_child[idx].pid = pid;
 355         live_child[idx].addrlen = addrlen;
 356         memcpy(&live_child[idx].address, addr, addrlen);
 357 }
 358
 359 /*
 360  * Walk from "deleted" to "spawned", and remove child "pid".
 361  *
 362  * We move everything up by one, since the new "deleted" will
 363  * be one higher.
 364  */
 365 static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
 366 {
 367         struct child n;
 368
 369         deleted %= MAX_CHILDREN;
 370         spawned %= MAX_CHILDREN;
 371         if (live_child[deleted].pid == pid) {
 372                 live_child[deleted].pid = -1;
 373                 return;
 374         }
 375         n = live_child[deleted];
 376         for (;;) {
 377                 struct child m;
 378                 deleted = (deleted + 1) % MAX_CHILDREN;
 379                 if (deleted == spawned)
 380                         die("could not find dead child %d\n", pid);
 381                 m = live_child[deleted];
 382                 live_child[deleted] = n;
 383                 if (m.pid == pid)
 384                         return;
 385                 n = m;
 386         }
 387 }
 388
 389 /*
 390  * This gets called if the number of connections grows
 391  * past "max_connections".
 392  *
 393  * We _should_ start off by searching for connections
 394  * from the same IP, and if there is some address wth
 395  * multiple connections, we should kill that first.
 396  *
 397  * As it is, we just "randomly" kill 25% of the connections,
 398  * and our pseudo-random generator sucks too. I have no
 399  * shame.
 400  *
 401  * Really, this is just a place-holder for a _real_ algorithm.
 402  */
 403 static void kill_some_children(int signo, unsigned start, unsigned stop)
 404 {
 405         start %= MAX_CHILDREN;
 406         stop %= MAX_CHILDREN;
 407         while (start != stop) {
 408                 if (!(start & 3))
 409                         kill(live_child[start].pid, signo);
 410                 start = (start + 1) % MAX_CHILDREN;
 411         }
 412 }
 413
 414 static void check_max_connections(void)
 415 {
 416         for (;;) {
 417                 int active;
 418                 unsigned spawned, reaped, deleted;
 419
 420                 spawned = children_spawned;
 421                 reaped = children_reaped;
 422                 deleted = children_deleted;
 423
 424                 while (deleted < reaped) {
 425                         pid_t pid = dead_child[deleted % MAX_CHILDREN];
 426                         remove_child(pid, deleted, spawned);
 427                         deleted++;
 428                 }
 429                 children_deleted = deleted;
 430
 431                 active = spawned - deleted;
 432                 if (active <= max_connections)
 433                         break;
 434
 435                 /* Kill some unstarted connections with SIGTERM */
 436                 kill_some_children(SIGTERM, deleted, spawned);
 437                 if (active <= max_connections << 1)
 438                         break;
 439
 440                 /* If the SIGTERM thing isn't helping use SIGKILL */
 441                 kill_some_children(SIGKILL, deleted, spawned);
 442                 sleep(1);
 443         }
 444 }
 445
 446 static void handle(int incoming, struct sockaddr *addr, int addrlen)
 447 {
 448         pid_t pid = fork();
 449
 450         if (pid) {
 451                 unsigned idx;
 452
 453                 close(incoming);
 454                 if (pid < 0)
 455                         return;
 456
 457                 idx = children_spawned % MAX_CHILDREN;
 458                 children_spawned++;
 459                 add_child(idx, pid, addr, addrlen);
 460
 461                 check_max_connections();
 462                 return;
 463         }
 464
 465         dup2(incoming, 0);
 466         dup2(incoming, 1);
 467         close(incoming);
 468
 469         exit(execute(addr));
 470 }
 471
 472 static void child_handler(int signo)
 473 {
 474         for (;;) {
 475                 int status;
 476                 pid_t pid = waitpid(-1, &status, WNOHANG);
 477
 478                 if (pid > 0) {
 479                         unsigned reaped = children_reaped;
 480                         dead_child[reaped % MAX_CHILDREN] = pid;
 481                         children_reaped = reaped + 1;
 482                         /* XXX: Custom logging, since we don't wanna getpid() */
 483                         if (verbose) {
 484                                 const char *dead = "";
 485                                 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 486                                         dead = " (with error)";
 487                                 if (log_syslog)
 488                                         syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
 489                                 else
 490                                         fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
 491                         }
 492                         continue;
 493                 }
 494                 break;
 495         }
 496 }
 497
 498 static int set_reuse_addr(int sockfd)
 499 {
 500         int on = 1;
 501
 502         if (!reuseaddr)
 503                 return 0;
 504         return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
 505                           &on, sizeof(on));
 506 }
 507
 508 #ifndef NO_IPV6
 509
 510 static int socksetup(int port, int **socklist_p)
 511 {
 512         int socknum = 0, *socklist = NULL;
 513         int maxfd = -1;
 514         char pbuf[NI_MAXSERV];
 515
 516         struct addrinfo hints, *ai0, *ai;
 517         int gai;
 518
 519         sprintf(pbuf, "%d", port);
 520         memset(&hints, 0, sizeof(hints));
 521         hints.ai_family = AF_UNSPEC;
 522         hints.ai_socktype = SOCK_STREAM;
 523         hints.ai_protocol = IPPROTO_TCP;
 524         hints.ai_flags = AI_PASSIVE;
 525
 526         gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
 527         if (gai)
 528                 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
 529
 530         for (ai = ai0; ai; ai = ai->ai_next) {
 531                 int sockfd;
 532
 533                 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 534                 if (sockfd < 0)
 535                         continue;
 536                 if (sockfd >= FD_SETSIZE) {
 537                         error("too large socket descriptor.");
 538                         close(sockfd);
 539                         continue;
 540                 }
 541
 542 #ifdef IPV6_V6ONLY
 543                 if (ai->ai_family == AF_INET6) {
 544                         int on = 1;
 545                         setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
 546                                    &on, sizeof(on));
 547                         /* Note: error is not fatal */
 548                 }
 549 #endif
 550
 551                 if (set_reuse_addr(sockfd)) {
 552                         close(sockfd);
 553                         continue;
 554                 }
 555
 556                 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 557                         close(sockfd);
 558                         continue;       /* not fatal */
 559                 }
 560                 if (listen(sockfd, 5) < 0) {
 561                         close(sockfd);
 562                         continue;       /* not fatal */
 563                 }
 564
 565                 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
 566                 socklist[socknum++] = sockfd;
 567
 568                 if (maxfd < sockfd)
 569                         maxfd = sockfd;
 570         }
 571
 572         freeaddrinfo(ai0);
 573
 574         *socklist_p = socklist;
 575         return socknum;
 576 }
 577
 578 #else /* NO_IPV6 */
 579
 580 static int socksetup(int port, int **socklist_p)
 581 {
 582         struct sockaddr_in sin;
 583         int sockfd;
 584
 585         sockfd = socket(AF_INET, SOCK_STREAM, 0);
 586         if (sockfd < 0)
 587                 return 0;
 588
 589         memset(&sin, 0, sizeof sin);
 590         sin.sin_family = AF_INET;
 591         sin.sin_addr.s_addr = htonl(INADDR_ANY);
 592         sin.sin_port = htons(port);
 593
 594         if (set_reuse_addr(sockfd)) {
 595                 close(sockfd);
 596                 return 0;
 597         }
 598
 599         if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
 600                 close(sockfd);
 601                 return 0;
 602         }
 603
 604         if (listen(sockfd, 5) < 0) {
 605                 close(sockfd);
 606                 return 0;
 607         }
 608
 609         *socklist_p = xmalloc(sizeof(int));
 610         **socklist_p = sockfd;
 611         return 1;
 612 }
 613
 614 #endif
 615
 616 static int service_loop(int socknum, int *socklist)
 617 {
 618         struct pollfd *pfd;
 619         int i;
 620
 621         pfd = xcalloc(socknum, sizeof(struct pollfd));
 622
 623         for (i = 0; i < socknum; i++) {
 624                 pfd[i].fd = socklist[i];
 625                 pfd[i].events = POLLIN;
 626         }
 627
 628         signal(SIGCHLD, child_handler);
 629
 630         for (;;) {
 631                 int i;
 632
 633                 if (poll(pfd, socknum, -1) < 0) {
 634                         if (errno != EINTR) {
 635                                 error("poll failed, resuming: %s",
 636                                       strerror(errno));
 637                                 sleep(1);
 638                         }
 639                         continue;
 640                 }
 641
 642                 for (i = 0; i < socknum; i++) {
 643                         if (pfd[i].revents & POLLIN) {
 644                                 struct sockaddr_storage ss;
 645                                 unsigned int sslen = sizeof(ss);
 646                                 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
 647                                 if (incoming < 0) {
 648                                         switch (errno) {
 649                                         case EAGAIN:
 650                                         case EINTR:
 651                                         case ECONNABORTED:
 652                                                 continue;
 653                                         default:
 654                                                 die("accept returned %s", strerror(errno));
 655                                         }
 656                                 }
 657                                 handle(incoming, (struct sockaddr *)&ss, sslen);
 658                         }
 659                 }
 660         }
 661 }
 662
 663 /* if any standard file descriptor is missing open it to /dev/null */
 664 static void sanitize_stdfds(void)
 665 {
 666         int fd = open("/dev/null", O_RDWR, 0);
 667         while (fd != -1 && fd < 2)
 668                 fd = dup(fd);
 669         if (fd == -1)
 670                 die("open /dev/null or dup failed: %s", strerror(errno));
 671         if (fd > 2)
 672                 close(fd);
 673 }
 674
 675 static void daemonize(void)
 676 {
 677         switch (fork()) {
 678                 case 0:
 679                         break;
 680                 case -1:
 681                         die("fork failed: %s", strerror(errno));
 682                 default:
 683                         exit(0);
 684         }
 685         if (setsid() == -1)
 686                 die("setsid failed: %s", strerror(errno));
 687         close(0);
 688         close(1);
 689         close(2);
 690         sanitize_stdfds();
 691 }
 692
 693 static void store_pid(const char *path)
 694 {
 695         FILE *f = fopen(path, "w");
 696         if (!f)
 697                 die("cannot open pid file %s: %s", path, strerror(errno));
 698         fprintf(f, "%d\n", getpid());
 699         fclose(f);
 700 }
 701
 702 static int serve(int port, struct passwd *pass, gid_t gid)
 703 {
 704         int socknum, *socklist;
 705
 706         socknum = socksetup(port, &socklist);
 707         if (socknum == 0)
 708                 die("unable to allocate any listen sockets on port %u", port);
 709
 710         if (pass && gid &&
 711             (initgroups(pass->pw_name, gid) || setgid (gid) ||
 712              setuid(pass->pw_uid)))
 713                 die("cannot drop privileges");
 714
 715         return service_loop(socknum, socklist);
 716 }
 717
 718 int main(int argc, char **argv)
 719 {
 720         int port = DEFAULT_GIT_PORT;
 721         int inetd_mode = 0;
 722         const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
 723         int detach = 0;
 724         struct passwd *pass = NULL;
 725         struct group *group;
 726         gid_t gid = 0;
 727         int i;
 728
 729         /* Without this we cannot rely on waitpid() to tell
 730          * what happened to our children.
 731          */
 732         signal(SIGCHLD, SIG_DFL);
 733
 734         for (i = 1; i < argc; i++) {
 735                 char *arg = argv[i];
 736
 737                 if (!strncmp(arg, "--port=", 7)) {
 738                         char *end;
 739                         unsigned long n;
 740                         n = strtoul(arg+7, &end, 0);
 741                         if (arg[7] && !*end) {
 742                                 port = n;
 743                                 continue;
 744                         }
 745                 }
 746                 if (!strcmp(arg, "--inetd")) {
 747                         inetd_mode = 1;
 748                         log_syslog = 1;
 749                         continue;
 750                 }
 751                 if (!strcmp(arg, "--verbose")) {
 752                         verbose = 1;
 753                         continue;
 754                 }
 755                 if (!strcmp(arg, "--syslog")) {
 756                         log_syslog = 1;
 757                         continue;
 758                 }
 759                 if (!strcmp(arg, "--export-all")) {
 760                         export_all_trees = 1;
 761                         continue;
 762                 }
 763                 if (!strncmp(arg, "--timeout=", 10)) {
 764                         timeout = atoi(arg+10);
 765                         continue;
 766                 }
 767                 if (!strncmp(arg, "--init-timeout=", 15)) {
 768                         init_timeout = atoi(arg+15);
 769                         continue;
 770                 }
 771                 if (!strcmp(arg, "--strict-paths")) {
 772                         strict_paths = 1;
 773                         continue;
 774                 }
 775                 if (!strncmp(arg, "--base-path=", 12)) {
 776                         base_path = arg+12;
 777                         continue;
 778                 }
 779                 if (!strcmp(arg, "--reuseaddr")) {
 780                         reuseaddr = 1;
 781                         continue;
 782                 }
 783                 if (!strcmp(arg, "--user-path")) {
 784                         user_path = "";
 785                         continue;
 786                 }
 787                 if (!strncmp(arg, "--user-path=", 12)) {
 788                         user_path = arg + 12;
 789                         continue;
 790                 }
 791                 if (!strncmp(arg, "--pid-file=", 11)) {
 792                         pid_file = arg + 11;
 793                         continue;
 794                 }
 795                 if (!strcmp(arg, "--detach")) {
 796                         detach = 1;
 797                         log_syslog = 1;
 798                         continue;
 799                 }
 800                 if (!strncmp(arg, "--user=", 7)) {
 801                         user_name = arg + 7;
 802                         continue;
 803                 }
 804                 if (!strncmp(arg, "--group=", 8)) {
 805                         group_name = arg + 8;
 806                         continue;
 807                 }
 808                 if (!strcmp(arg, "--")) {
 809                         ok_paths = &argv[i+1];
 810                         break;
 811                 } else if (arg[0] != '-') {
 812                         ok_paths = &argv[i];
 813                         break;
 814                 }
 815
 816                 usage(daemon_usage);
 817         }
 818
 819         if (inetd_mode && (group_name || user_name))
 820                 die("--user and --group are incompatible with --inetd");
 821
 822         if (group_name && !user_name)
 823                 die("--group supplied without --user");
 824
 825         if (user_name) {
 826                 pass = getpwnam(user_name);
 827                 if (!pass)
 828                         die("user not found - %s", user_name);
 829
 830                 if (!group_name)
 831                         gid = pass->pw_gid;
 832                 else {
 833                         group = getgrnam(group_name);
 834                         if (!group)
 835                                 die("group not found - %s", group_name);
 836
 837                         gid = group->gr_gid;
 838                 }
 839         }
 840
 841         if (log_syslog) {
 842                 openlog("git-daemon", 0, LOG_DAEMON);
 843                 set_die_routine(daemon_die);
 844         }
 845
 846         if (strict_paths && (!ok_paths || !*ok_paths))
 847                 die("option --strict-paths requires a whitelist");
 848
 849         if (inetd_mode) {
 850                 struct sockaddr_storage ss;
 851                 struct sockaddr *peer = (struct sockaddr *)&ss;
 852                 socklen_t slen = sizeof(ss);
 853
 854                 freopen("/dev/null", "w", stderr);
 855
 856                 if (getpeername(0, peer, &slen))
 857                         peer = NULL;
 858
 859                 return execute(peer);
 860         }
 861
 862         if (detach)
 863                 daemonize();
 864         else
 865                 sanitize_stdfds();
 866
 867         if (pid_file)
 868                 store_pid(pid_file);
 869
 870         return serve(port, pass, gid);
 871 }