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GeezerVison is showing github.com — rsync/clientserver.c at master · AndyA/rsync Expand file tree/ Copy pathclientserver.cMore file actions 1170 lines (1022 loc) · 29.9 KB / Copy pathclientserver.cFile metadata and controls1170 lines (1022 loc) · 29.9 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* * The socket based protocol for setting up a connection with rsyncd. * * Copyright (C) 1998-2001 Andrew Tridgell <[email protected]> * Copyright (C) 2001-2002 Martin Pool <[email protected]> * Copyright (C) 2002-2009 Wayne Davison * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, visit the http://fsf.org website. */ #include "rsync.h" #include "itypes.h" extern int quiet; extern int dry_run; extern int output_motd; extern int list_only; extern int am_sender; extern int am_server; extern int am_daemon; extern int am_root; extern int rsync_port; extern int protect_args; extern int ignore_errors; extern int preserve_xattrs; extern int kluge_around_eof; extern int daemon_over_rsh; extern int munge_symlinks; extern int sanitize_paths; extern int numeric_ids; extern int filesfrom_fd; extern int remote_protocol; extern int protocol_version; extern int io_timeout; extern int no_detach; extern int write_batch; extern int default_af_hint; extern int logfile_format_has_i; extern int logfile_format_has_o_or_i; extern char *bind_address; extern char *config_file; extern char *logfile_format; extern char *files_from; extern char *tmpdir; extern struct chmod_mode_struct *chmod_modes; extern filter_rule_list daemon_filter_list; #ifdef ICONV_OPTION extern char *iconv_opt; extern iconv_t ic_send, ic_recv; #endif #define MAX_GID_LIST 32 char *auth_user; int read_only = 0; int module_id = -1; struct chmod_mode_struct *daemon_chmod_modes; /* module_dirlen is the length of the module_dir string when in daemon * mode and module_dir is not "/"; otherwise 0. (Note that a chroot- * enabled module can have a non-"/" module_dir these days.) */ char *module_dir = NULL; unsigned int module_dirlen = 0; char *full_module_path; static int rl_nulls = 0; #ifdef HAVE_SIGACTION static struct sigaction sigact; #endif static gid_t gid_list[MAX_GID_LIST]; static int gid_count = 0; /* Used when "reverse lookup" is off. */ const char undetermined_hostname[] = "UNDETERMINED"; /** * Run a client connected to an rsyncd. The alternative to this * function for remote-shell connections is do_cmd(). * * After negotiating which module to use and reading the server's * motd, this hands over to client_run(). Telling the server the * module will cause it to chroot/setuid/etc. * * Instead of doing a transfer, the client may at this stage instead * get a listing of remote modules and exit. * * @return -1 for error in startup, or the result of client_run(). * Either way, it eventually gets passed to exit_cleanup(). **/ int start_socket_client(char *host, int remote_argc, char *remote_argv[], int argc, char *argv[]) { int fd, ret; char *p, *user = NULL; /* This is redundant with code in start_inband_exchange(), but this * short-circuits a problem in the client before we open a socket, * and the extra check won't hurt. */ if (**remote_argv == '/') { rprintf(FERROR, "ERROR: The remote path must start with a module name not a /\n"); return -1; } if ((p = strrchr(host, '@')) != NULL) { user = host; host = p+1; *p = '\0'; } fd = open_socket_out_wrapped(host, rsync_port, bind_address, default_af_hint); if (fd == -1) exit_cleanup(RERR_SOCKETIO); #ifdef ICONV_CONST setup_iconv(); #endif ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv); return ret ? ret : client_run(fd, fd, -1, argc, argv); } static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client) { int remote_sub = -1; #if SUBPROTOCOL_VERSION != 0 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; #else int our_sub = 0; #endif char *motd; io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub); if (!am_client) { motd = lp_motd_file(); if (motd && *motd) { FILE *f = fopen(motd,"r"); while (f && !feof(f)) { int len = fread(buf, 1, bufsiz - 1, f); if (len > 0) write_buf(f_out, buf, len); } if (f) fclose(f); write_sbuf(f_out, "\n"); } } /* This strips the \n. */ if (!read_line_old(f_in, buf, bufsiz, 0)) { if (am_client) rprintf(FERROR, "rsync: did not see server greeting\n"); return -1; } if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) { if (am_client) rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf); else io_printf(f_out, "@ERROR: protocol startup error\n"); return -1; } if (remote_sub < 0) { if (remote_protocol == 30) { if (am_client) rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n"); else io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n"); return -1; } remote_sub = 0; } if (protocol_version > remote_protocol) { protocol_version = remote_protocol; if (remote_sub) protocol_version--; } else if (protocol_version == remote_protocol) { if (remote_sub != our_sub) protocol_version--; } #if SUBPROTOCOL_VERSION != 0 else if (protocol_version < remote_protocol) { if (our_sub) protocol_version--; } #endif if (protocol_version >= 30) rl_nulls = 1; return 0; } int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[]) { int i, modlen; char line[BIGPATHBUFLEN]; char *sargs[MAX_ARGS]; int sargc = 0; char *p, *modname; assert(argc > 0 && *argv != NULL); if (**argv == '/') { rprintf(FERROR, "ERROR: The remote path must start with a module name\n"); return -1; } if (!(p = strchr(*argv, '/'))) modlen = strlen(*argv); else modlen = p - *argv; if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */ out_of_memory("start_inband_exchange"); strlcpy(modname, *argv, modlen + 1); modname[modlen] = '/'; modname[modlen+1] = '\0'; if (!user) user = getenv("USER"); if (!user) user = getenv("LOGNAME"); if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0) return -1; /* set daemon_over_rsh to false since we need to build the * true set of args passed through the rsh/ssh connection; * this is a no-op for direct-socket-connection mode */ daemon_over_rsh = 0; server_options(sargs, &sargc); if (sargc >= MAX_ARGS - 2) goto arg_overflow; sargs[sargc++] = "."; while (argc > 0) { if (sargc >= MAX_ARGS - 1) { arg_overflow: rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n"); exit_cleanup(RERR_SYNTAX); } if (strncmp(*argv, modname, modlen) == 0 && argv[0][modlen] == '\0') sargs[sargc++] = modname; /* we send "modname/" */ else if (**argv == '-') { if (asprintf(sargs + sargc++, "./%s", *argv) < 0) out_of_memory("start_inband_exchange"); } else sargs[sargc++] = *argv; argv++; argc--; } sargs[sargc] = NULL; if (DEBUG_GTE(CMD, 1)) print_child_argv("sending daemon args:", sargs); io_printf(f_out, "%.*s\n", modlen, modname); /* Old servers may just drop the connection here, rather than sending a proper EXIT command. Yuck. */ kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; while (1) { if (!read_line_old(f_in, line, sizeof line, 0)) { rprintf(FERROR, "rsync: didn't get server startup line\n"); return -1; } if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { auth_client(f_out, user, line+18); continue; } if (strcmp(line,"@RSYNCD: OK") == 0) break; if (strcmp(line,"@RSYNCD: EXIT") == 0) { /* This is sent by recent versions of the * server to terminate the listing of modules. * We don't want to go on and transfer * anything; just exit. */ exit(0); } if (strncmp(line, "@ERROR", 6) == 0) { rprintf(FERROR, "%s\n", line); /* This is always fatal; the server will now * close the socket. */ return -1; } /* This might be a MOTD line or a module listing, but there is * no way to differentiate it. The manpage mentions this. */ if (output_motd) rprintf(FINFO, "%s\n", line); } kluge_around_eof = 0; if (rl_nulls) { for (i = 0; i < sargc; i++) { if (!sargs[i]) /* stop at --protect-args NULL */ break; write_sbuf(f_out, sargs[i]); write_byte(f_out, 0); } write_byte(f_out, 0); } else { for (i = 0; i < sargc; i++) io_printf(f_out, "%s\n", sargs[i]); write_sbuf(f_out, "\n"); } if (protect_args) send_protected_args(f_out, sargs); if (protocol_version < 23) { if (protocol_version == 22 || !am_sender) io_start_multiplex_in(f_in); } free(modname); return 0; } static char *finish_pre_exec(pid_t pid, int fd, char *request, char **early_argv, char **argv) { int j = 0, status = -1; if (!request) request = "(NONE)"; write_buf(fd, request, strlen(request)+1); if (early_argv) { for ( ; *early_argv; early_argv++) write_buf(fd, *early_argv, strlen(*early_argv)+1); j = 1; /* Skip arg0 name in argv. */ } for ( ; argv[j]; j++) { write_buf(fd, argv[j], strlen(argv[j])+1); if (argv[j][0] == '.' && argv[j][1] == '\0') break; } write_byte(fd, 0); close(fd); if (wait_process(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { char *e; if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n", status, status < 0 ? ": " : "", status < 0 ? strerror(errno) : "") < 0) out_of_memory("finish_pre_exec"); return e; } return NULL; } #ifdef HAVE_PUTENV static int read_arg_from_pipe(int fd, char *buf, int limit) { char *bp = buf, *eob = buf + limit - 1; while (1) { int got = read(fd, bp, 1); if (got != 1) { if (got < 0 && errno == EINTR) continue; return -1; } if (*bp == '\0') break; if (bp < eob) bp++; } *bp = '\0'; return bp - buf; } #endif static int path_failure(int f_out, const char *dir, BOOL was_chdir) { if (was_chdir) rsyserr(FLOG, errno, "chdir %s failed\n", dir); else rprintf(FLOG, "normalize_path(%s) failed\n", dir); io_printf(f_out, "@ERROR: chdir failed\n"); return -1; } static int add_a_group(int f_out, const char *gname) { gid_t gid; if (!group_to_gid(gname, &gid, True)) { rprintf(FLOG, "Invalid gid %s\n", gname); io_printf(f_out, "@ERROR: invalid gid %s\n", gname); return -1; } if (gid_count == MAX_GID_LIST) { rprintf(FLOG, "Too many groups specified via gid parameter.\n"); io_printf(f_out, "@ERROR: too many groups\n"); return -1; } gid_list[gid_count++] = gid; return 0; } #ifdef HAVE_GETGROUPLIST static int want_all_groups(int f_out, uid_t uid) { const char *err; gid_count = MAX_GID_LIST; if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) { rsyserr(FLOG, errno, "%s", err); io_printf(f_out, "@ERROR: %s\n", err); return -1; } return 0; } #elif defined HAVE_INITGROUPS static struct passwd *want_all_groups(int f_out, uid_t uid) { struct passwd *pw; if ((pw = getpwuid(uid)) == NULL) { rsyserr(FLOG, errno, "getpwuid failed"); io_printf(f_out, "@ERROR: getpwuid failed\n"); return NULL; } /* Start with the default group and initgroups() will add the reset. */ gid_count = 1; gid_list[0] = pw->pw_gid; return pw; } #endif static void set_env_str(const char *var, const char *str) { #ifdef HAVE_PUTENV char *mem; if (asprintf(&mem, "%s=%s", var, str) < 0) out_of_memory("set_env_str"); putenv(mem); #endif } #ifdef HAVE_PUTENV static void set_env_num(const char *var, long num) { char *mem; if (asprintf(&mem, "%s=%ld", var, num) < 0) out_of_memory("set_env_num"); putenv(mem); } #endif static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host) { int argc; char **argv, **orig_argv, **orig_early_argv, *module_chdir; char line[BIGPATHBUFLEN]; #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST struct passwd *pw = NULL; #endif uid_t uid; int set_uid; char *p, *err_msg = NULL; char *name = lp_name(i); int use_chroot = lp_use_chroot(i); int ret, pre_exec_fd = -1; int save_munge_symlinks; pid_t pre_exec_pid = 0; char *request = NULL; set_env_str("RSYNC_MODULE_NAME", name); #ifdef ICONV_OPTION iconv_opt = lp_charset(i); if (*iconv_opt) setup_iconv(); iconv_opt = NULL; #endif /* If reverse lookup is disabled globally but enabled for this module, * we need to do it now before the access check. */ if (host == undetermined_hostname && lp_reverse_lookup(i)) host = client_name(f_in); set_env_str("RSYNC_HOST_NAME", host); set_env_str("RSYNC_HOST_ADDR", addr); if (!allow_access(addr, &host, i)) { rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", name, host, addr); if (!lp_list(i)) io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); else { io_printf(f_out, "@ERROR: access denied to %s from %s (%s)\n", name, host, addr); } return -1; } if (am_daemon && am_server) { rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", name, host, addr); } if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { if (errno) { rsyserr(FLOG, errno, "failed to open lock file %s", lp_lock_file(i)); io_printf(f_out, "@ERROR: failed to open lock file\n"); } else { rprintf(FLOG, "max connections (%d) reached\n", lp_max_connections(i)); io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", lp_max_connections(i)); } return -1; } read_only = lp_read_only(i); /* may also be overridden by auth_server() */ auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); if (!auth_user) { io_printf(f_out, "@ERROR: auth failed on module %s\n", name); return -1; } set_env_str("RSYNC_USER_NAME", auth_user); module_id = i; if (lp_transfer_logging(i) && !logfile_format) logfile_format = lp_log_format(i); if (log_format_has(logfile_format, 'i')) logfile_format_has_i = 1; if (logfile_format_has_i || log_format_has(logfile_format, 'o')) logfile_format_has_o_or_i = 1; uid = MY_UID(); am_root = (uid == 0); p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL; if (p) { if (!user_to_uid(p, &uid, True)) { rprintf(FLOG, "Invalid uid %s\n", p); io_printf(f_out, "@ERROR: invalid uid %s\n", p); return -1; } set_uid = 1; } else set_uid = 0; p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL; if (p) { /* The "*" gid must be the first item in the list. */ if (strcmp(p, "*") == 0) { #ifdef HAVE_GETGROUPLIST if (want_all_groups(f_out, uid) < 0) return -1; #elif defined HAVE_INITGROUPS if ((pw = want_all_groups(f_out, uid)) == NULL) return -1; #else rprintf(FLOG, "This rsync does not support a gid of \"*\"\n"); io_printf(f_out, "@ERROR: invalid gid setting.\n"); return -1; #endif } else if (add_a_group(f_out, p) < 0) return -1; while ((p = strtok(NULL, ", ")) != NULL) { #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST if (pw) { rprintf(FLOG, "This rsync cannot add groups after \"*\".\n"); io_printf(f_out, "@ERROR: invalid gid setting.\n"); return -1; } #endif if (add_a_group(f_out, p) < 0) return -1; } } else if (am_root) { if (add_a_group(f_out, NOBODY_GROUP) < 0) return -1; } module_dir = lp_path(i); if (*module_dir == '\0') { rprintf(FLOG, "No path specified for module %s\n", name); io_printf(f_out, "@ERROR: no path setting.\n"); return -1; } if (use_chroot) { if ((p = strstr(module_dir, "/./")) != NULL) { *p = '\0'; /* Temporary... */ if (!(module_chdir = normalize_path(module_dir, True, NULL))) return path_failure(f_out, module_dir, False); *p = '/'; if (!(p = normalize_path(p + 2, True, &module_dirlen))) return path_failure(f_out, strstr(module_dir, "/./"), False); if (!(full_module_path = normalize_path(module_dir, False, NULL))) full_module_path = module_dir; module_dir = p; } else { if (!(module_chdir = normalize_path(module_dir, False, NULL))) return path_failure(f_out, module_dir, False); full_module_path = module_chdir; module_dir = "/"; module_dirlen = 1; } } else { if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen))) return path_failure(f_out, module_dir, False); full_module_path = module_dir = module_chdir; } set_env_str("RSYNC_MODULE_PATH", full_module_path); if (module_dirlen == 1) { module_dirlen = 0; set_filter_dir("/", 1); } else set_filter_dir(module_dir, module_dirlen); p = lp_filter(i); parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT), XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3); p = lp_include_from(i); parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE), XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); p = lp_include(i); parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT), XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES); p = lp_exclude_from(i); parse_filter_file(&daemon_filter_list, p, rule_template(0), XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); p = lp_exclude(i); parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT), XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES); log_init(1); #ifdef HAVE_PUTENV if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) { int status; /* For post-xfer exec, fork a new process to run the rsync * daemon while this process waits for the exit status and * runs the indicated command at that point. */ if (*lp_postxfer_exec(i)) { pid_t pid = fork(); if (pid < 0) { rsyserr(FLOG, errno, "fork failed"); io_printf(f_out, "@ERROR: fork failed\n"); return -1; } if (pid) { close(f_in); if (f_out != f_in) close(f_out); set_env_num("RSYNC_PID", (long)pid); if (wait_process(pid, &status, 0) < 0) status = -1; set_env_num("RSYNC_RAW_STATUS", status); if (WIFEXITED(status)) status = WEXITSTATUS(status); else status = -1; set_env_num("RSYNC_EXIT_STATUS", status); if (system(lp_postxfer_exec(i)) < 0) status = -1; _exit(status); } } /* For pre-xfer exec, fork a child process to run the indicated * command, though it first waits for the parent process to * send us the user's request via a pipe. */ if (*lp_prexfer_exec(i)) { int fds[2]; set_env_num("RSYNC_PID", (long)getpid()); if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); return -1; } if (pre_exec_pid == 0) { char buf[BIGPATHBUFLEN]; int j, len; close(fds[1]); set_blocking(fds[0]); len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); if (len <= 0) _exit(1); set_env_str("RSYNC_REQUEST", buf); for (j = 0; ; j++) { len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); if (len <= 0) { if (!len) break; _exit(1); } if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0) putenv(p); } close(fds[0]); close(STDIN_FILENO); close(STDOUT_FILENO); status = system(lp_prexfer_exec(i)); if (!WIFEXITED(status)) _exit(1); _exit(WEXITSTATUS(status)); } close(fds[0]); set_blocking(fds[1]); pre_exec_fd = fds[1]; } } #endif if (use_chroot) { /* * XXX: The 'use chroot' flag is a fairly reliable * source of confusion, because it fails under two * important circumstances: running as non-root, * running on Win32 (or possibly others). On the * other hand, if you are running as root, then it * might be better to always use chroot. * * So, perhaps if we can't chroot we should just issue * a warning, unless a "require chroot" flag is set, * in which case we fail. */ if (chroot(module_chdir)) { rsyserr(FLOG, errno, "chroot %s failed", module_chdir); io_printf(f_out, "@ERROR: chroot failed\n"); return -1; } module_chdir = module_dir; } if (!change_dir(module_chdir, CD_NORMAL)) return path_failure(f_out, module_chdir, True); if (module_dirlen || !use_chroot) sanitize_paths = 1; if ((munge_symlinks = lp_munge_symlinks(i)) < 0) munge_symlinks = !use_chroot || module_dirlen; if (munge_symlinks) { STRUCT_STAT st; char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */ strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */ if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) { rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n", prefix); io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name); exit_cleanup(RERR_UNSUPPORTED); } } if (gid_count) { if (setgid(gid_list[0])) { rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]); io_printf(f_out, "@ERROR: setgid failed\n"); return -1; } #ifdef HAVE_SETGROUPS /* Set the group(s) we want to be active. */ if (setgroups(gid_count, gid_list)) { rsyserr(FLOG, errno, "setgroups failed"); io_printf(f_out, "@ERROR: setgroups failed\n"); return -1; } #endif #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST /* pw is set if the user wants all the user's groups. */ if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) { rsyserr(FLOG, errno, "initgroups failed"); io_printf(f_out, "@ERROR: initgroups failed\n"); return -1; } #endif } if (set_uid) { if (setuid(uid) < 0 #ifdef HAVE_SETEUID || seteuid(uid) < 0 #endif ) { rsyserr(FLOG, errno, "setuid %ld failed", (long)uid); io_printf(f_out, "@ERROR: setuid failed\n"); return -1; } am_root = (MY_UID() == 0); } if (lp_temp_dir(i) && *lp_temp_dir(i)) { tmpdir = lp_temp_dir(i); if (strlen(tmpdir) >= MAXPATHLEN - 10) { rprintf(FLOG, "the 'temp dir' value for %s is WAY too long -- ignoring.\n", name); tmpdir = NULL; } } io_printf(f_out, "@RSYNCD: OK\n"); read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request); orig_argv = argv; save_munge_symlinks = munge_symlinks; reset_output_levels(); /* future verbosity is controlled by client options */ ret = parse_arguments(&argc, (const char ***) &argv); if (protect_args && ret) { orig_early_argv = orig_argv; protect_args = 2; read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request); orig_argv = argv; ret = parse_arguments(&argc, (const char ***) &argv); } else orig_early_argv = NULL; munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */ if (pre_exec_pid) { err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, orig_early_argv, orig_argv); } if (orig_early_argv) free(orig_early_argv); am_server = 1; /* Don't let someone try to be tricky. */ quiet = 0; if (lp_ignore_errors(module_id)) ignore_errors = 1; if (write_batch < 0) dry_run = 1; if (lp_fake_super(i)) { if (preserve_xattrs > 1) preserve_xattrs = 1; am_root = -1; } else if (am_root < 0) /* Treat --fake-super from client as --super. */ am_root = 2; if (filesfrom_fd == 0) filesfrom_fd = f_in; if (request) { if (*auth_user) { rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", am_sender ? "on" : "to", request, auth_user, host, addr); } else { rprintf(FLOG, "rsync %s %s from %s (%s)\n", am_sender ? "on" : "to", request, host, addr); } free(request); } #ifndef DEBUG /* don't allow the logs to be flooded too fast */ limit_output_verbosity(lp_max_verbosity(i)); #endif if (protocol_version < 23 && (protocol_version == 22 || am_sender)) io_start_multiplex_out(f_out); else if (!ret || err_msg) { /* We have to get I/O multiplexing started so that we can * get the error back to the client. This means getting * the protocol setup finished first in later versions. */ setup_protocol(f_out, f_in); if (!am_sender) { /* Since we failed in our option parsing, we may not * have finished parsing that the client sent us a * --files-from option, so look for it manually. * Without this, the socket would be in the wrong * state for the upcoming error message. */ if (!files_from) { int i; for (i = 0; i < argc; i++) { if (strncmp(argv[i], "--files-from", 12) == 0) { files_from = ""; break; } } } if (files_from) write_byte(f_out, 0); } io_start_multiplex_out(f_out); } if (!ret || err_msg) { if (err_msg) rwrite(FERROR, err_msg, strlen(err_msg), 0); else option_error(); msleep(400); exit_cleanup(RERR_UNSUPPORTED); } #ifdef ICONV_OPTION if (!iconv_opt) { if (ic_send != (iconv_t)-1) { iconv_close(ic_send); ic_send = (iconv_t)-1; } if (ic_recv != (iconv_t)-1) { iconv_close(ic_recv); ic_recv = (iconv_t)-1; } } #endif if (!numeric_ids && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True)) numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */ if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout)) set_io_timeout(lp_timeout(i)); /* If we have some incoming/outgoing chmod changes, append them to * any user-specified changes (making our changes have priority). * We also get a pointer to just our changes so that a receiver * process can use them separately if --perms wasn't specified. */ if (am_sender) p = lp_outgoing_chmod(i); else p = lp_incoming_chmod(i); if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) { rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", am_sender ? "outgo" : "incom", p); } start_server(f_in, f_out, argc, argv); return 0; } /* send a list of available modules to the client. Don't list those with "list = False". */ static void send_listing(int fd) { int n = lp_num_modules(); int i; for (i = 0; i < n; i++) { if (lp_list(i)) io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); } if (protocol_version >= 25) io_printf(fd,"@RSYNCD: EXIT\n"); } static int load_config(int globals_only) { if (!config_file) { if (am_server && am_root <= 0) config_file = RSYNCD_USERCONF; |
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