compat.c

   1 /*
   2  * Compatibility routines for older rsync protocol versions.
   3  *
   4  * Copyright (C) Andrew Tridgell 1996
   5  * Copyright (C) Paul Mackerras 1996
   6  * Copyright (C) 2004-2020 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  20  */
  21
  22 #include "rsync.h"
  23
  24 extern int am_server;
  25 extern int am_sender;
  26 extern int local_server;
  27 extern int inplace;
  28 extern int recurse;
  29 extern int use_qsort;
  30 extern int allow_inc_recurse;
  31 extern int preallocate_files;
  32 extern int append_mode;
  33 extern int fuzzy_basis;
  34 extern int read_batch;
  35 extern int write_batch;
  36 extern int delay_updates;
  37 extern int checksum_seed;
  38 extern int basis_dir_cnt;
  39 extern int prune_empty_dirs;
  40 extern int protocol_version;
  41 extern int protect_args;
  42 extern int preserve_uid;
  43 extern int preserve_gid;
  44 extern int preserve_atimes;
  45 extern int preserve_acls;
  46 extern int preserve_xattrs;
  47 extern int xfer_flags_as_varint;
  48 extern int need_messages_from_generator;
  49 extern int delete_mode, delete_before, delete_during, delete_after;
  50 extern int xfersum_type;
  51 extern int checksum_type;
  52 extern int do_compression;
  53 extern char *shell_cmd;
  54 extern char *partial_dir;
  55 extern char *dest_option;
  56 extern char *files_from;
  57 extern char *filesfrom_host;
  58 extern char *checksum_choice;
  59 extern char *compress_choice;
  60 extern filter_rule_list filter_list;
  61 extern int need_unsorted_flist;
  62 #ifdef ICONV_OPTION
  63 extern iconv_t ic_send, ic_recv;
  64 extern char *iconv_opt;
  65 #endif
  66 extern struct name_num_obj valid_checksums;
  67
  68 int remote_protocol = 0;
  69 int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
  70 int inc_recurse = 0;
  71 int compat_flags = 0;
  72 int use_safe_inc_flist = 0;
  73 int want_xattr_optim = 0;
  74 int proper_seed_order = 0;
  75 int inplace_partial = 0;
  76 int do_negotiated_strings = 0;
  77
  78 /* These index values are for the file-list's extra-attribute array. */
  79 int pathname_ndx, depth_ndx, atimes_ndx, uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  80
  81 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  82 int sender_symlink_iconv = 0;   /* sender should convert symlink content */
  83
  84 #ifdef ICONV_OPTION
  85 int filesfrom_convert = 0;
  86 #endif
  87
  88 #define MAX_NSTR_STRLEN 256
  89
  90 #define CPRES_NONE 0
  91 #define CPRES_ZLIB 1
  92
  93 struct name_num_obj valid_compressions = {
  94         "compress", NULL, NULL, 0, 0, {
  95                 { CPRES_ZLIB, "zlib", NULL },
  96                 { CPRES_NONE, "none", "" }, /* The "" prevents us from listing this name by default */
  97                 { 0, NULL, NULL }
  98         }
  99 };
 100
 101 #define CF_INC_RECURSE   (1<<0)
 102 #define CF_SYMLINK_TIMES (1<<1)
 103 #define CF_SYMLINK_ICONV (1<<2)
 104 #define CF_SAFE_FLIST    (1<<3)
 105 #define CF_AVOID_XATTR_OPTIM (1<<4)
 106 #define CF_CHKSUM_SEED_FIX (1<<5)
 107 #define CF_INPLACE_PARTIAL_DIR (1<<6)
 108 #define CF_VARINT_FLIST_FLAGS (1<<7)
 109
 110 static const char *client_info;
 111
 112 /* The server makes sure that if either side only supports a pre-release
 113  * version of a protocol, that both sides must speak a compatible version
 114  * of that protocol for it to be advertised as available. */
 115 static void check_sub_protocol(void)
 116 {
 117         char *dot;
 118         int their_protocol, their_sub;
 119 #if SUBPROTOCOL_VERSION != 0
 120         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
 121 #else
 122         int our_sub = 0;
 123 #endif
 124
 125         /* client_info starts with VER.SUB string if client is a pre-release. */
 126         if (!(their_protocol = atoi(client_info))
 127          || !(dot = strchr(client_info, '.'))
 128          || !(their_sub = atoi(dot+1))) {
 129 #if SUBPROTOCOL_VERSION != 0
 130                 if (our_sub)
 131                         protocol_version--;
 132 #endif
 133                 return;
 134         }
 135
 136         if (their_protocol < protocol_version) {
 137                 if (their_sub)
 138                         protocol_version = their_protocol - 1;
 139                 return;
 140         }
 141
 142         if (their_protocol > protocol_version)
 143                 their_sub = 0; /* 0 == final version of older protocol */
 144         if (their_sub != our_sub)
 145                 protocol_version--;
 146 }
 147
 148 void set_allow_inc_recurse(void)
 149 {
 150         client_info = shell_cmd ? shell_cmd : "";
 151
 152         if (!recurse || use_qsort)
 153                 allow_inc_recurse = 0;
 154         else if (!am_sender
 155          && (delete_before || delete_after
 156           || delay_updates || prune_empty_dirs))
 157                 allow_inc_recurse = 0;
 158         else if (am_server && !local_server
 159          && (strchr(client_info, 'i') == NULL))
 160                 allow_inc_recurse = 0;
 161 }
 162
 163 struct name_num_item *get_nni_by_name(struct name_num_obj *nno, const char *name, int len)
 164 {
 165         struct name_num_item *nni;
 166
 167         if (len < 0)
 168                 len = strlen(name);
 169
 170         for (nni = nno->list; nni->name; nni++) {
 171                 if (strncasecmp(name, nni->name, len) == 0 && nni->name[len] == '\0')
 172                         return nni;
 173         }
 174
 175         return NULL;
 176 }
 177
 178 struct name_num_item *get_nni_by_num(struct name_num_obj *nno, int num)
 179 {
 180         struct name_num_item *nni;
 181
 182         for (nni = nno->list; nni->name; nni++) {
 183                 if (num == nni->num)
 184                         return nni;
 185         }
 186
 187         return NULL;
 188 }
 189
 190 static void init_nno_saw(struct name_num_obj *nno, int val)
 191 {
 192         struct name_num_item *nni;
 193         int cnt;
 194
 195         if (!nno->saw_len) {
 196                 for (nni = nno->list; nni->name; nni++) {
 197                         if (nni->num >= nno->saw_len)
 198                                 nno->saw_len = nni->num + 1;
 199                 }
 200         }
 201
 202         if (!nno->saw) {
 203                 if (!(nno->saw = new_array0(uchar, nno->saw_len)))
 204                         out_of_memory("init_nno_saw");
 205
 206                 /* We'll take this opportunity to make sure that the main_name values are set right. */
 207                 for (cnt = 1, nni = nno->list; nni->name; nni++, cnt++) {
 208                         if (nno->saw[nni->num])
 209                                 nni->main_name = nno->list[nno->saw[nni->num]-1].name;
 210                         else
 211                                 nno->saw[nni->num] = cnt;
 212                 }
 213         }
 214
 215         memset(nno->saw, val, nno->saw_len);
 216 }
 217
 218 /* Simplify the user-provided string so that it contains valid names without any duplicates.
 219  * It also sets the "saw" flags to a 1-relative count of which name was seen first. */
 220 static int parse_nni_str(struct name_num_obj *nno, const char *from, char *tobuf, int tobuf_len)
 221 {
 222         char *to = tobuf, *tok = NULL;
 223         int cnt = 0;
 224
 225         while (1) {
 226                 if (*from == ' ' || !*from) {
 227                         if (tok) {
 228                                 struct name_num_item *nni = get_nni_by_name(nno, tok, to - tok);
 229                                 if (nni && !nno->saw[nni->num]) {
 230                                         nno->saw[nni->num] = ++cnt;
 231                                         if (nni->main_name && *nni->main_name) {
 232                                                 to = tok + strlcpy(tok, nni->main_name, tobuf_len - (tok - tobuf));
 233                                                 if (to - tobuf >= tobuf_len) {
 234                                                         to = tok - 1;
 235                                                         break;
 236                                                 }
 237                                         } else
 238                                                 nni->main_name = NULL; /* Override a "" entry */
 239                                 } else
 240                                         to = tok - (tok != tobuf);
 241                                 tok = NULL;
 242                         }
 243                         if (!*from++)
 244                                 break;
 245                         continue;
 246                 }
 247                 if (!tok) {
 248                         if (to != tobuf)
 249                                 *to++ = ' ';
 250                         tok = to;
 251                 }
 252                 if (to - tobuf >= tobuf_len - 1) {
 253                         to = tok - (tok != tobuf);
 254                         break;
 255                 }
 256                 *to++ = *from++;
 257         }
 258         *to = '\0';
 259
 260         return to - tobuf;
 261 }
 262
 263 static void recv_negotiate_str(int f_in, struct name_num_obj *nno, char *tmpbuf, int len)
 264 {
 265         struct name_num_item *ret = NULL;
 266
 267         if (len < 0)
 268                 len = read_vstring(f_in, tmpbuf, MAX_NSTR_STRLEN);
 269
 270         if (DEBUG_GTE(NSTR, am_server ? 4 : 2))
 271                 rprintf(FINFO, "Server %s list: %s%s\n", nno->type, tmpbuf, am_server ? " (on server)" : "");
 272
 273         if (len > 0) {
 274                 int best = nno->saw_len; /* We want best == 1 from the client list, so start with a big number. */
 275                 char *tok;
 276                 if (am_server)
 277                         init_nno_saw(nno, 1); /* Since we're parsing client names, anything we parse first is #1. */
 278                 for (tok = strtok(tmpbuf, " \t"); tok; tok = strtok(NULL, " \t")) {
 279                         struct name_num_item *nni = get_nni_by_name(nno, tok, -1);
 280                         if (!nni || !nno->saw[nni->num] || best <= nno->saw[nni->num])
 281                                 continue;
 282                         ret = nni;
 283                         best = nno->saw[nni->num];
 284                         if (best == 1)
 285                                 break;
 286                 }
 287                 if (ret) {
 288                         free(nno->saw);
 289                         nno->saw = NULL;
 290                         nno->negotiated_name = ret->main_name ? ret->main_name : ret->name;
 291                         nno->negotiated_num = ret->num;
 292                         return;
 293                 }
 294         }
 295
 296         if (!am_server)
 297                 rprintf(FERROR, "Failed to negotiate a common %s\n", nno->type);
 298         exit_cleanup(RERR_UNSUPPORTED);
 299 }
 300
 301 static void send_negotiate_str(int f_out, struct name_num_obj *nno, const char *env_name)
 302 {
 303         char tmpbuf[MAX_NSTR_STRLEN];
 304         struct name_num_item *nni;
 305         const char *list_str = getenv(env_name);
 306         int len, fail_if_empty = list_str && strstr(list_str, "FAIL");
 307
 308         if (!do_negotiated_strings) {
 309                 if (!am_server && fail_if_empty) {
 310                         rprintf(FERROR, "Remote rsync is too old for %s negotation\n", nno->type);
 311                         exit_cleanup(RERR_UNSUPPORTED);
 312                 }
 313                 return;
 314         }
 315
 316         init_nno_saw(nno, 0);
 317
 318         if (list_str && *list_str && (!am_server || local_server)) {
 319                 len = parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN);
 320                 if (fail_if_empty && !len)
 321                         len = strlcpy(tmpbuf, "FAIL", MAX_NSTR_STRLEN);
 322                 list_str = tmpbuf;
 323         } else
 324                 list_str = NULL;
 325
 326         if (!list_str || !*list_str) {
 327                 int cnt = 0;
 328                 for (nni = nno->list, len = 0; nni->name; nni++) {
 329                         if (nni->main_name)
 330                                 continue;
 331                         if (len)
 332                                 tmpbuf[len++]= ' ';
 333                         len += strlcpy(tmpbuf+len, nni->name, MAX_NSTR_STRLEN - len);
 334                         if (len >= (int)MAX_NSTR_STRLEN - 1)
 335                                 exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE... */
 336                         nno->saw[nni->num] = ++cnt;
 337                 }
 338         }
 339
 340         if (DEBUG_GTE(NSTR, am_server ? 4 : 2))
 341                 rprintf(FINFO, "Client %s list: %s%s\n", nno->type, tmpbuf, am_server ? " (on server)" : "");
 342
 343         if (local_server) {
 344                 /* A local server doesn't bother to send/recv the strings, it just constructs
 345                  * and parses the same string on both sides. */
 346                 if (!read_batch)
 347                         recv_negotiate_str(-1, nno, tmpbuf, len);
 348         } else {
 349                 /* Each side sends their list of valid names to the other side and then both sides
 350                  * pick the first name in the client's list that is also in the server's list. */
 351                 write_vstring(f_out, tmpbuf, len);
 352         }
 353 }
 354
 355 static void negotiate_the_strings(int f_in, int f_out)
 356 {
 357         /* We send all the negotiation strings before we start to read them to help avoid a slow startup. */
 358
 359         if (!checksum_choice)
 360                 send_negotiate_str(f_out, &valid_checksums, "RSYNC_CHECKSUM_LIST");
 361
 362         if (do_compression && !compress_choice)
 363                 send_negotiate_str(f_out, &valid_compressions, "RSYNC_COMPRESS_LIST");
 364
 365         if (valid_checksums.saw) {
 366                 char tmpbuf[MAX_NSTR_STRLEN];
 367                 recv_negotiate_str(f_in, &valid_checksums, tmpbuf, -1);
 368         }
 369         if (valid_checksums.negotiated_name)
 370                 xfersum_type = checksum_type = valid_checksums.negotiated_num;
 371
 372         if (valid_compressions.saw) {
 373                 char tmpbuf[MAX_NSTR_STRLEN];
 374                 recv_negotiate_str(f_in, &valid_compressions, tmpbuf, -1);
 375         }
 376 #if 0
 377         if (valid_compressions.negotiated_name)
 378                 compress_type = valid_checksums.negotiated_num;
 379 #endif
 380 }
 381
 382 void setup_protocol(int f_out,int f_in)
 383 {
 384         assert(file_extra_cnt == 0);
 385         assert(EXTRA64_CNT == 2 || EXTRA64_CNT == 1);
 386
 387         /* All int64 values must be set first so that they are guaranteed to be
 388          * aligned for direct int64-pointer memory access. */
 389         if (preserve_atimes)
 390                 atimes_ndx = (file_extra_cnt += EXTRA64_CNT);
 391         if (am_sender) /* This is most likely in the in64 union as well. */
 392                 pathname_ndx = (file_extra_cnt += PTR_EXTRA_CNT);
 393         else
 394                 depth_ndx = ++file_extra_cnt;
 395         if (preserve_uid)
 396                 uid_ndx = ++file_extra_cnt;
 397         if (preserve_gid)
 398                 gid_ndx = ++file_extra_cnt;
 399         if (preserve_acls && !am_sender)
 400                 acls_ndx = ++file_extra_cnt;
 401         if (preserve_xattrs)
 402                 xattrs_ndx = ++file_extra_cnt;
 403
 404         if (am_server)
 405                 set_allow_inc_recurse();
 406
 407         if (remote_protocol == 0) {
 408                 if (am_server && !local_server)
 409                         check_sub_protocol();
 410                 if (!read_batch)
 411                         write_int(f_out, protocol_version);
 412                 remote_protocol = read_int(f_in);
 413                 if (protocol_version > remote_protocol)
 414                         protocol_version = remote_protocol;
 415         }
 416         if (read_batch && remote_protocol > protocol_version) {
 417                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 418                         remote_protocol, protocol_version);
 419                 exit_cleanup(RERR_PROTOCOL);
 420         }
 421
 422         if (DEBUG_GTE(PROTO, 1)) {
 423                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 424                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 425         }
 426         if (remote_protocol < MIN_PROTOCOL_VERSION
 427          || remote_protocol > MAX_PROTOCOL_VERSION) {
 428                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 429                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 430                 exit_cleanup(RERR_PROTOCOL);
 431         }
 432         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 433                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 434                         am_server? "Client" : "Server");
 435         }
 436         if (protocol_version < MIN_PROTOCOL_VERSION) {
 437                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 438                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 439                 exit_cleanup(RERR_PROTOCOL);
 440         }
 441         if (protocol_version > PROTOCOL_VERSION) {
 442                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 443                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 444                 exit_cleanup(RERR_PROTOCOL);
 445         }
 446         if (read_batch)
 447                 check_batch_flags();
 448
 449 #ifndef SUPPORT_PREALLOCATION
 450         if (preallocate_files && !am_sender) {
 451                 rprintf(FERROR, "preallocation is not supported on this %s\n",
 452                         am_server ? "Server" : "Client");
 453                 exit_cleanup(RERR_SYNTAX);
 454         }
 455 #endif
 456
 457         if (protocol_version < 30) {
 458                 if (append_mode == 1)
 459                         append_mode = 2;
 460                 if (preserve_acls && !local_server) {
 461                         rprintf(FERROR,
 462                             "--acls requires protocol 30 or higher"
 463                             " (negotiated %d).\n",
 464                             protocol_version);
 465                         exit_cleanup(RERR_PROTOCOL);
 466                 }
 467                 if (preserve_xattrs && !local_server) {
 468                         rprintf(FERROR,
 469                             "--xattrs requires protocol 30 or higher"
 470                             " (negotiated %d).\n",
 471                             protocol_version);
 472                         exit_cleanup(RERR_PROTOCOL);
 473                 }
 474         }
 475
 476         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 477                 if (protocol_version < 30)
 478                         delete_before = 1;
 479                 else
 480                         delete_during = 1;
 481         }
 482
 483         if (protocol_version < 29) {
 484                 if (fuzzy_basis) {
 485                         rprintf(FERROR,
 486                             "--fuzzy requires protocol 29 or higher"
 487                             " (negotiated %d).\n",
 488                             protocol_version);
 489                         exit_cleanup(RERR_PROTOCOL);
 490                 }
 491
 492                 if (basis_dir_cnt && inplace) {
 493                         rprintf(FERROR,
 494                             "%s with --inplace requires protocol 29 or higher"
 495                             " (negotiated %d).\n",
 496                             dest_option, protocol_version);
 497                         exit_cleanup(RERR_PROTOCOL);
 498                 }
 499
 500                 if (basis_dir_cnt > 1) {
 501                         rprintf(FERROR,
 502                             "Using more than one %s option requires protocol"
 503                             " 29 or higher (negotiated %d).\n",
 504                             dest_option, protocol_version);
 505                         exit_cleanup(RERR_PROTOCOL);
 506                 }
 507
 508                 if (prune_empty_dirs) {
 509                         rprintf(FERROR,
 510                             "--prune-empty-dirs requires protocol 29 or higher"
 511                             " (negotiated %d).\n",
 512                             protocol_version);
 513                         exit_cleanup(RERR_PROTOCOL);
 514                 }
 515         } else if (protocol_version >= 30) {
 516                 if (am_server) {
 517                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 518 #ifdef CAN_SET_SYMLINK_TIMES
 519                         compat_flags |= CF_SYMLINK_TIMES;
 520 #endif
 521 #ifdef ICONV_OPTION
 522                         compat_flags |= CF_SYMLINK_ICONV;
 523 #endif
 524                         if (local_server || strchr(client_info, 'f') != NULL)
 525                                 compat_flags |= CF_SAFE_FLIST;
 526                         if (local_server || strchr(client_info, 'x') != NULL)
 527                                 compat_flags |= CF_AVOID_XATTR_OPTIM;
 528                         if (local_server || strchr(client_info, 'C') != NULL)
 529                                 compat_flags |= CF_CHKSUM_SEED_FIX;
 530                         if (local_server || strchr(client_info, 'I') != NULL)
 531                                 compat_flags |= CF_INPLACE_PARTIAL_DIR;
 532                         if (local_server || strchr(client_info, 'v') != NULL) {
 533                                 if (!write_batch || protocol_version >= 30) {
 534                                         do_negotiated_strings = 1;
 535                                         compat_flags |= CF_VARINT_FLIST_FLAGS;
 536                                 }
 537                         }
 538                         if (strchr(client_info, 'V') != NULL) { /* Support a pre-release 'V' that got superseded */
 539                                 if (!write_batch)
 540                                         compat_flags |= CF_VARINT_FLIST_FLAGS;
 541                                 write_byte(f_out, compat_flags);
 542                         } else
 543                                 write_varint(f_out, compat_flags);
 544                 } else { /* read_varint() is compatible with the older write_byte() when the 0x80 bit isn't on. */
 545                         compat_flags = read_varint(f_in);
 546                         if  (compat_flags & CF_VARINT_FLIST_FLAGS)
 547                                 do_negotiated_strings = 1;
 548                 }
 549                 /* The inc_recurse var MUST be set to 0 or 1. */
 550                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 551                 want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
 552                 proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
 553                 xfer_flags_as_varint = compat_flags & CF_VARINT_FLIST_FLAGS ? 1 : 0;
 554                 if (am_sender) {
 555                         receiver_symlink_times = am_server
 556                             ? strchr(client_info, 'L') != NULL
 557                             : !!(compat_flags & CF_SYMLINK_TIMES);
 558                 }
 559 #ifdef CAN_SET_SYMLINK_TIMES
 560                 else
 561                         receiver_symlink_times = 1;
 562 #endif
 563 #ifdef ICONV_OPTION
 564                 sender_symlink_iconv = iconv_opt && (am_server
 565                     ? local_server || strchr(client_info, 's') != NULL
 566                     : !!(compat_flags & CF_SYMLINK_ICONV));
 567 #endif
 568                 if (inc_recurse && !allow_inc_recurse) {
 569                         /* This should only be able to happen in a batch. */
 570                         fprintf(stderr,
 571                             "Incompatible options specified for inc-recursive %s.\n",
 572                             read_batch ? "batch file" : "connection");
 573                         exit_cleanup(RERR_SYNTAX);
 574                 }
 575                 use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
 576                 need_messages_from_generator = 1;
 577                 if (compat_flags & CF_INPLACE_PARTIAL_DIR)
 578                         inplace_partial = 1;
 579 #ifdef CAN_SET_SYMLINK_TIMES
 580         } else if (!am_sender) {
 581                 receiver_symlink_times = 1;
 582 #endif
 583         }
 584
 585         if (need_unsorted_flist && (!am_sender || inc_recurse))
 586                 unsort_ndx = ++file_extra_cnt;
 587
 588         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 589                 int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
 590                 if (!am_sender || protocol_version >= 30)
 591                         rflags |= FILTRULE_PERISHABLE;
 592                 parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
 593         }
 594
 595
 596 #ifdef ICONV_OPTION
 597         if (protect_args && files_from) {
 598                 if (am_sender)
 599                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 600                 else
 601                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 602         }
 603 #endif
 604
 605         negotiate_the_strings(f_in, f_out);
 606
 607         if (am_server) {
 608                 if (!checksum_seed)
 609                         checksum_seed = time(NULL) ^ (getpid() << 6);
 610                 write_int(f_out, checksum_seed);
 611         } else {
 612                 checksum_seed = read_int(f_in);
 613         }
 614
 615         init_flist();
 616 }
 617
 618 void maybe_write_negotiated_strings(int batch_fd)
 619 {
 620         if (valid_checksums.negotiated_name)
 621                 write_vstring(batch_fd, valid_checksums.negotiated_name, strlen(valid_checksums.negotiated_name));
 622
 623         if (valid_compressions.negotiated_name)
 624                 write_vstring(batch_fd, valid_compressions.negotiated_name, strlen(valid_compressions.negotiated_name));
 625 }