diff options
Diffstat (limited to 'compat.c')
| -rw-r--r-- | compat.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/compat.c b/compat.c new file mode 100644 index 0000000..a8a6afe --- /dev/null +++ b/compat.c @@ -0,0 +1,887 @@ +/* + * Compatibility routines for older rsync protocol versions. + * + * Copyright (C) Andrew Tridgell 1996 + * Copyright (C) Paul Mackerras 1996 + * Copyright (C) 2004-2022 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" +#include "ifuncs.h" + +extern int am_server; +extern int am_sender; +extern int local_server; +extern int inplace; +extern int recurse; +extern int use_qsort; +extern int allow_inc_recurse; +extern int preallocate_files; +extern int append_mode; +extern int fuzzy_basis; +extern int read_batch; +extern int write_batch; +extern int delay_updates; +extern int checksum_seed; +extern int basis_dir_cnt; +extern int prune_empty_dirs; +extern int protocol_version; +extern int protect_args; +extern int preserve_uid; +extern int preserve_gid; +extern int preserve_atimes; +extern int preserve_crtimes; +extern int preserve_acls; +extern int preserve_xattrs; +extern int xfer_flags_as_varint; +extern int need_messages_from_generator; +extern int delete_mode, delete_before, delete_during, delete_after; +extern int do_compression; +extern int do_compression_level; +extern int saw_stderr_opt; +extern int msgs2stderr; +extern char *shell_cmd; +extern char *partial_dir; +extern char *files_from; +extern char *filesfrom_host; +extern const char *checksum_choice; +extern const char *compress_choice; +extern char *daemon_auth_choices; +extern filter_rule_list filter_list; +extern int need_unsorted_flist; +#ifdef ICONV_OPTION +extern iconv_t ic_send, ic_recv; +extern char *iconv_opt; +#endif +extern struct name_num_obj valid_checksums, valid_auth_checksums; + +extern struct name_num_item *xfer_sum_nni; + +int remote_protocol = 0; +int file_extra_cnt = 0; /* count of file-list extras that everyone gets */ +int inc_recurse = 0; +int compat_flags = 0; +int use_safe_inc_flist = 0; +int want_xattr_optim = 0; +int proper_seed_order = 0; +int inplace_partial = 0; +int do_negotiated_strings = 0; +int xmit_id0_names = 0; + +struct name_num_item *xattr_sum_nni; +int xattr_sum_len = 0; + +/* These index values are for the file-list's extra-attribute array. */ +int pathname_ndx, depth_ndx, atimes_ndx, crtimes_ndx, uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx; + +int receiver_symlink_times = 0; /* receiver can set the time on a symlink */ +int sender_symlink_iconv = 0; /* sender should convert symlink content */ + +#ifdef ICONV_OPTION +int filesfrom_convert = 0; +#endif + +#define MAX_NSTR_STRLEN 256 + +struct name_num_item valid_compressions_items[] = { +#ifdef SUPPORT_ZSTD + { CPRES_ZSTD, 0, "zstd", NULL }, +#endif +#ifdef SUPPORT_LZ4 + { CPRES_LZ4, 0, "lz4", NULL }, +#endif + { CPRES_ZLIBX, 0, "zlibx", NULL }, + { CPRES_ZLIB, 0, "zlib", NULL }, + { CPRES_NONE, 0, "none", NULL }, + { 0, 0, NULL, NULL } +}; + +struct name_num_obj valid_compressions = { + "compress", NULL, 0, 0, valid_compressions_items +}; + +#define CF_INC_RECURSE (1<<0) +#define CF_SYMLINK_TIMES (1<<1) +#define CF_SYMLINK_ICONV (1<<2) +#define CF_SAFE_FLIST (1<<3) +#define CF_AVOID_XATTR_OPTIM (1<<4) +#define CF_CHKSUM_SEED_FIX (1<<5) +#define CF_INPLACE_PARTIAL_DIR (1<<6) +#define CF_VARINT_FLIST_FLAGS (1<<7) +#define CF_ID0_NAMES (1<<8) + +static const char *client_info; + +/* The server makes sure that if either side only supports a pre-release + * version of a protocol, that both sides must speak a compatible version + * of that protocol for it to be advertised as available. */ +static void check_sub_protocol(void) +{ + char *dot; + int their_protocol, their_sub; + int our_sub = get_subprotocol_version(); + + /* client_info starts with VER.SUB string if client is a pre-release. */ + if (!(their_protocol = atoi(client_info)) + || !(dot = strchr(client_info, '.')) + || !(their_sub = atoi(dot+1))) { +#if SUBPROTOCOL_VERSION != 0 + if (our_sub) + protocol_version--; +#endif + return; + } + + if (their_protocol < protocol_version) { + if (their_sub) + protocol_version = their_protocol - 1; + return; + } + + if (their_protocol > protocol_version) + their_sub = 0; /* 0 == final version of older protocol */ + if (their_sub != our_sub) + protocol_version--; +} + +void set_allow_inc_recurse(void) +{ + if (!local_server) + client_info = shell_cmd ? shell_cmd : ""; + else if (am_server) { + char buf[64]; + maybe_add_e_option(buf, sizeof buf); + client_info = *buf ? strdup(buf+1) : ""; /* The +1 skips the leading "e". */ + } + + if (!recurse || use_qsort) + allow_inc_recurse = 0; + else if (!am_sender + && (delete_before || delete_after + || delay_updates || prune_empty_dirs)) + allow_inc_recurse = 0; + else if (am_server && strchr(client_info, 'i') == NULL) + allow_inc_recurse = 0; +} + +void parse_compress_choice(int final_call) +{ + if (valid_compressions.negotiated_nni) + do_compression = valid_compressions.negotiated_nni->num; + else if (compress_choice) { + struct name_num_item *nni = get_nni_by_name(&valid_compressions, compress_choice, -1); + if (!nni) { + rprintf(FERROR, "unknown compress name: %s\n", compress_choice); + exit_cleanup(RERR_UNSUPPORTED); + } + do_compression = nni->num; + if (am_server) + validate_choice_vs_env(NSTR_COMPRESS, do_compression, -1); + } else if (do_compression) + do_compression = CPRES_ZLIB; + else + do_compression = CPRES_NONE; + + if (do_compression != CPRES_NONE && final_call) + init_compression_level(); /* There's a chance this might turn compression off! */ + + if (do_compression == CPRES_NONE) + compress_choice = NULL; + + /* Snag the compression name for both write_batch's option output & the following debug output. */ + if (valid_compressions.negotiated_nni) + compress_choice = valid_compressions.negotiated_nni->name; + else if (compress_choice == NULL) { + struct name_num_item *nni = get_nni_by_num(&valid_compressions, do_compression); + compress_choice = nni ? nni->name : "UNKNOWN"; + } + + if (final_call && DEBUG_GTE(NSTR, am_server ? 3 : 1) + && (do_compression != CPRES_NONE || do_compression_level != CLVL_NOT_SPECIFIED)) { + rprintf(FINFO, "%s%s compress: %s (level %d)\n", + am_server ? "Server" : "Client", + valid_compressions.negotiated_nni ? " negotiated" : "", + compress_choice, do_compression_level); + } +} + +struct name_num_item *get_nni_by_name(struct name_num_obj *nno, const char *name, int len) +{ + struct name_num_item *nni; + + if (len < 0) + len = strlen(name); + + for (nni = nno->list; nni->name; nni++) { + if (nni->num == CSUM_gone) + continue; + if (strncasecmp(name, nni->name, len) == 0 && nni->name[len] == '\0') + return nni; + } + + return NULL; +} + +struct name_num_item *get_nni_by_num(struct name_num_obj *nno, int num) +{ + struct name_num_item *nni; + + for (nni = nno->list; nni->name; nni++) { + if (num == nni->num) + return nni; + } + + return NULL; +} + +static void init_nno_saw(struct name_num_obj *nno, int val) +{ + struct name_num_item *nni; + int cnt; + + if (!nno->saw_len) { + for (nni = nno->list; nni->name; nni++) { + if (nni->num >= nno->saw_len) + nno->saw_len = nni->num + 1; + } + } + + if (!nno->saw) { + nno->saw = new_array0(uchar, nno->saw_len); + + /* We'll take this opportunity to set the main_nni values for duplicates. */ + for (cnt = 1, nni = nno->list; nni->name; nni++, cnt++) { + if (nni->num == CSUM_gone) + continue; + if (nno->saw[nni->num]) + nni->main_nni = &nno->list[nno->saw[nni->num]-1]; + else + nno->saw[nni->num] = cnt; + } + } + + memset(nno->saw, val, nno->saw_len); +} + +/* Simplify the user-provided string so that it contains valid names without any duplicates. + * It also sets the "saw" flags to a 1-relative count of which name was seen first. */ +static int parse_nni_str(struct name_num_obj *nno, const char *from, char *tobuf, int tobuf_len) +{ + char *to = tobuf, *tok = NULL; + int saw_tok = 0, cnt = 0; + + while (1) { + int at_space = isSpace(from); + char ch = *from++; + if (ch == '&') + ch = '\0'; + if (!ch || at_space) { + if (tok) { + struct name_num_item *nni = get_nni_by_name(nno, tok, to - tok); + if (nni && !nno->saw[nni->num]) { + nno->saw[nni->num] = ++cnt; + if (nni->main_nni) { + to = tok + strlcpy(tok, nni->main_nni->name, tobuf_len - (tok - tobuf)); + if (to - tobuf >= tobuf_len) { + to = tok - 1; + break; + } + } + } else + to = tok - (tok != tobuf); + saw_tok = 1; + tok = NULL; + } + if (!ch) + break; + continue; + } + if (!tok) { + if (to != tobuf) + *to++ = ' '; + tok = to; + } + if (to - tobuf >= tobuf_len - 1) { + to = tok - (tok != tobuf); + break; + } + *to++ = ch; + } + *to = '\0'; + + if (saw_tok && to == tobuf) + return strlcpy(tobuf, "INVALID", MAX_NSTR_STRLEN); + + return to - tobuf; +} + +static int parse_negotiate_str(struct name_num_obj *nno, char *tmpbuf) +{ + struct name_num_item *nni, *ret = NULL; + int best = nno->saw_len; /* We want best == 1 from the client list, so start with a big number. */ + char *space, *tok = tmpbuf; + while (tok) { + while (*tok == ' ') tok++; /* Should be unneeded... */ + if (!*tok) + break; + if ((space = strchr(tok, ' ')) != NULL) + *space = '\0'; + nni = get_nni_by_name(nno, tok, -1); + if (space) { + *space = ' '; + tok = space + 1; + } else + tok = NULL; + if (!nni || !nno->saw[nni->num] || best <= nno->saw[nni->num]) + continue; + ret = nni; + best = nno->saw[nni->num]; + if (best == 1 || am_server) /* The server side stops at the first acceptable client choice */ + break; + } + if (ret) { + free(nno->saw); + nno->saw = NULL; + nno->negotiated_nni = ret->main_nni ? ret->main_nni : ret; + return 1; + } + return 0; +} + +/* This routine is always called with a tmpbuf of MAX_NSTR_STRLEN length, but the + * buffer may be pre-populated with a "len" length string to use OR a len of -1 + * to tell us to read a string from the fd. */ +static void recv_negotiate_str(int f_in, struct name_num_obj *nno, char *tmpbuf, int len) +{ + if (len < 0) + len = read_vstring(f_in, tmpbuf, MAX_NSTR_STRLEN); + + if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) { + if (am_server) + rprintf(FINFO, "Client %s list (on server): %s\n", nno->type, tmpbuf); + else + rprintf(FINFO, "Server %s list (on client): %s\n", nno->type, tmpbuf); + } + + if (len > 0 && parse_negotiate_str(nno, tmpbuf)) + return; + + if (!am_server || !do_negotiated_strings) { + char *cp = tmpbuf; + int j; + rprintf(FERROR, "Failed to negotiate a %s choice.\n", nno->type); + rprintf(FERROR, "%s list: %s\n", am_server ? "Client" : "Server", tmpbuf); + /* Recreate our original list from the saw values. This can't overflow our huge + * buffer because we don't have enough valid entries to get anywhere close. */ + for (j = 1, *cp = '\0'; j <= nno->saw_len; j++) { + struct name_num_item *nni; + for (nni = nno->list; nni->name; nni++) { + if (nno->saw[nni->num] == j) { + *cp++ = ' '; + cp += strlcpy(cp, nni->name, MAX_NSTR_STRLEN - (cp - tmpbuf)); + break; + } + } + } + if (!*tmpbuf) + strlcpy(cp, " INVALID", MAX_NSTR_STRLEN); + rprintf(FERROR, "%s list:%s\n", am_server ? "Server" : "Client", tmpbuf); + } + + exit_cleanup(RERR_UNSUPPORTED); +} + +static const char *getenv_nstr(int ntype) +{ + const char *env_str = getenv(ntype == NSTR_COMPRESS ? "RSYNC_COMPRESS_LIST" : "RSYNC_CHECKSUM_LIST"); + + /* When writing a batch file, we always negotiate an old-style choice. */ + if (write_batch) + env_str = ntype == NSTR_COMPRESS ? "zlib" : protocol_version >= 30 ? "md5" : "md4"; + + if (am_server && env_str) { + char *cp = strchr(env_str, '&'); + if (cp) + env_str = cp + 1; + } + + return env_str; +} + +void validate_choice_vs_env(int ntype, int num1, int num2) +{ + struct name_num_obj *nno = ntype == NSTR_COMPRESS ? &valid_compressions : &valid_checksums; + const char *list_str = getenv_nstr(ntype); + char tmpbuf[MAX_NSTR_STRLEN]; + + if (!list_str) + return; + + while (isSpace(list_str)) list_str++; + + if (!*list_str) + return; + + init_nno_saw(nno, 0); + parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN); + + if (ntype == NSTR_CHECKSUM) /* If "md4" is in the env list, all the old MD4 choices are OK too. */ + nno->saw[CSUM_MD4_ARCHAIC] = nno->saw[CSUM_MD4_BUSTED] = nno->saw[CSUM_MD4_OLD] = nno->saw[CSUM_MD4]; + + if (!nno->saw[num1] || (num2 >= 0 && !nno->saw[num2])) { + rprintf(FERROR, "Your --%s-choice value (%s) was refused by the server.\n", + ntype == NSTR_COMPRESS ? "compress" : "checksum", + ntype == NSTR_COMPRESS ? compress_choice : checksum_choice); + exit_cleanup(RERR_UNSUPPORTED); + } + + free(nno->saw); + nno->saw = NULL; +} + +/* The saw buffer is initialized and used to store ordinal values from 1 to N + * for the order of the args in the array. If dup_markup == '\0', duplicates + * are removed otherwise the char is prefixed to the duplicate term and, if it + * is an opening paren/bracket/brace, the matching closing char is suffixed. + * "none" is removed on the client side unless dup_markup != '\0'. */ +int get_default_nno_list(struct name_num_obj *nno, char *to_buf, int to_buf_len, char dup_markup) +{ + struct name_num_item *nni; + int len = 0, cnt = 0; + char delim = '\0', post_delim; + + switch (dup_markup) { + case '(': post_delim = ')'; break; + case '[': post_delim = ']'; break; + case '{': post_delim = '}'; break; + default: post_delim = '\0'; break; + } + + init_nno_saw(nno, 0); + + for (nni = nno->list, len = 0; nni->name; nni++) { + if (nni->num == CSUM_gone) + continue; + if (nni->main_nni) { + if (!dup_markup || nni->main_nni->num == CSUM_gone) + continue; + delim = dup_markup; + } + if (nni->num == 0 && !am_server && !dup_markup) + continue; + if (len) + to_buf[len++]= ' '; + if (delim) { + to_buf[len++]= delim; + delim = post_delim; + } + len += strlcpy(to_buf+len, nni->name, to_buf_len - len); + if (len >= to_buf_len - 3) + exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE... */ + if (delim) { + to_buf[len++]= delim; + delim = '\0'; + } + nno->saw[nni->num] = ++cnt; + } + + return len; +} + +static void send_negotiate_str(int f_out, struct name_num_obj *nno, int ntype) +{ + char tmpbuf[MAX_NSTR_STRLEN]; + const char *list_str = getenv_nstr(ntype); + int len; + + if (list_str && *list_str) { + init_nno_saw(nno, 0); + len = parse_nni_str(nno, list_str, tmpbuf, MAX_NSTR_STRLEN); + list_str = tmpbuf; + } else + list_str = NULL; + + if (!list_str || !*list_str) + len = get_default_nno_list(nno, tmpbuf, MAX_NSTR_STRLEN, '\0'); + + if (DEBUG_GTE(NSTR, am_server ? 3 : 2)) { + if (am_server) + rprintf(FINFO, "Server %s list (on server): %s\n", nno->type, tmpbuf); + else + rprintf(FINFO, "Client %s list (on client): %s\n", nno->type, tmpbuf); + } + + /* Each side sends their list of valid names to the other side and then both sides + * pick the first name in the client's list that is also in the server's list. */ + if (do_negotiated_strings) + write_vstring(f_out, tmpbuf, len); +} + +static void negotiate_the_strings(int f_in, int f_out) +{ + /* We send all the negotiation strings before we start to read them to help avoid a slow startup. */ + + init_checksum_choices(); + + if (!checksum_choice) + send_negotiate_str(f_out, &valid_checksums, NSTR_CHECKSUM); + + if (do_compression && !compress_choice) + send_negotiate_str(f_out, &valid_compressions, NSTR_COMPRESS); + + if (valid_checksums.saw) { + char tmpbuf[MAX_NSTR_STRLEN]; + int len; + if (do_negotiated_strings) + len = -1; + else + len = strlcpy(tmpbuf, protocol_version >= 30 ? "md5" : "md4", MAX_NSTR_STRLEN); + recv_negotiate_str(f_in, &valid_checksums, tmpbuf, len); + } + + if (valid_compressions.saw) { + char tmpbuf[MAX_NSTR_STRLEN]; + int len; + if (do_negotiated_strings) + len = -1; + else + len = strlcpy(tmpbuf, "zlib", MAX_NSTR_STRLEN); + recv_negotiate_str(f_in, &valid_compressions, tmpbuf, len); + } + + /* If the other side is too old to negotiate, the above steps just made sure that + * the env didn't disallow the old algorithm. Mark things as non-negotiated. */ + if (!do_negotiated_strings) + valid_checksums.negotiated_nni = valid_compressions.negotiated_nni = NULL; +} + +void setup_protocol(int f_out,int f_in) +{ + assert(file_extra_cnt == 0); + assert(EXTRA64_CNT == 2 || EXTRA64_CNT == 1); + + /* All int64 values must be set first so that they are guaranteed to be + * aligned for direct int64-pointer memory access. */ + if (preserve_atimes) + atimes_ndx = (file_extra_cnt += EXTRA64_CNT); + if (preserve_crtimes) + crtimes_ndx = (file_extra_cnt += EXTRA64_CNT); + if (am_sender) /* This is most likely in the file_extras64 union as well. */ + pathname_ndx = (file_extra_cnt += PTR_EXTRA_CNT); + else + depth_ndx = ++file_extra_cnt; + if (preserve_uid) + uid_ndx = ++file_extra_cnt; + if (preserve_gid) + gid_ndx = ++file_extra_cnt; + if (preserve_acls && !am_sender) + acls_ndx = ++file_extra_cnt; + if (preserve_xattrs) + xattrs_ndx = ++file_extra_cnt; + + if (am_server) + set_allow_inc_recurse(); + + if (remote_protocol == 0) { + if (am_server && !local_server) + check_sub_protocol(); + if (!read_batch) + write_int(f_out, protocol_version); + remote_protocol = read_int(f_in); + if (protocol_version > remote_protocol) + protocol_version = remote_protocol; + } + if (read_batch && remote_protocol > protocol_version) { + rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n", + remote_protocol, protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + + if (DEBUG_GTE(PROTO, 1)) { + rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n", + am_server? "Server" : "Client", remote_protocol, protocol_version); + } + if (remote_protocol < MIN_PROTOCOL_VERSION + || remote_protocol > MAX_PROTOCOL_VERSION) { + rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n"); + rprintf(FERROR,"(see the rsync manpage for an explanation)\n"); + exit_cleanup(RERR_PROTOCOL); + } + if (remote_protocol < OLD_PROTOCOL_VERSION) { + rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n", + am_server? "Client" : "Server"); + } + if (protocol_version < MIN_PROTOCOL_VERSION) { + rprintf(FERROR, "--protocol must be at least %d on the %s.\n", + MIN_PROTOCOL_VERSION, am_server? "Server" : "Client"); + exit_cleanup(RERR_PROTOCOL); + } + if (protocol_version > PROTOCOL_VERSION) { + rprintf(FERROR, "--protocol must be no more than %d on the %s.\n", + PROTOCOL_VERSION, am_server? "Server" : "Client"); + exit_cleanup(RERR_PROTOCOL); + } + if (read_batch) + check_batch_flags(); + + if (!saw_stderr_opt && protocol_version <= 28 && am_server) + msgs2stderr = 0; /* The client side may not have stderr setup for us. */ + +#ifndef SUPPORT_PREALLOCATION + if (preallocate_files && !am_sender) { + rprintf(FERROR, "preallocation is not supported on this %s\n", + am_server ? "Server" : "Client"); + exit_cleanup(RERR_SYNTAX); + } +#endif + + if (protocol_version < 30) { + if (append_mode == 1) + append_mode = 2; + if (preserve_acls && !local_server) { + rprintf(FERROR, + "--acls requires protocol 30 or higher" + " (negotiated %d).\n", + protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + if (preserve_xattrs && !local_server) { + rprintf(FERROR, + "--xattrs requires protocol 30 or higher" + " (negotiated %d).\n", + protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + } + + if (delete_mode && !(delete_before+delete_during+delete_after)) { + if (protocol_version < 30) + delete_before = 1; + else + delete_during = 1; + } + + if (protocol_version < 29) { + if (fuzzy_basis) { + rprintf(FERROR, + "--fuzzy requires protocol 29 or higher" + " (negotiated %d).\n", + protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + + if (basis_dir_cnt && inplace) { + rprintf(FERROR, + "%s with --inplace requires protocol 29 or higher" + " (negotiated %d).\n", + alt_dest_opt(0), protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + + if (basis_dir_cnt > 1) { + rprintf(FERROR, + "Using more than one %s option requires protocol" + " 29 or higher (negotiated %d).\n", + alt_dest_opt(0), protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + + if (prune_empty_dirs) { + rprintf(FERROR, + "--prune-empty-dirs requires protocol 29 or higher" + " (negotiated %d).\n", + protocol_version); + exit_cleanup(RERR_PROTOCOL); + } + } else if (protocol_version >= 30) { + if (am_server) { + compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0; +#ifdef CAN_SET_SYMLINK_TIMES + compat_flags |= CF_SYMLINK_TIMES; +#endif +#ifdef ICONV_OPTION + compat_flags |= CF_SYMLINK_ICONV; +#endif + if (strchr(client_info, 'f') != NULL) + compat_flags |= CF_SAFE_FLIST; + if (strchr(client_info, 'x') != NULL) + compat_flags |= CF_AVOID_XATTR_OPTIM; + if (strchr(client_info, 'C') != NULL) + compat_flags |= CF_CHKSUM_SEED_FIX; + if (strchr(client_info, 'I') != NULL) + compat_flags |= CF_INPLACE_PARTIAL_DIR; + if (strchr(client_info, 'u') != NULL) + compat_flags |= CF_ID0_NAMES; + if (strchr(client_info, 'v') != NULL) { + do_negotiated_strings = 1; + compat_flags |= CF_VARINT_FLIST_FLAGS; + } + if (strchr(client_info, 'V') != NULL) { /* Support a pre-release 'V' that got superseded */ + if (!write_batch) + compat_flags |= CF_VARINT_FLIST_FLAGS; + write_byte(f_out, compat_flags); + } else + write_varint(f_out, compat_flags); + } else { /* read_varint() is compatible with the older write_byte() when the 0x80 bit isn't on. */ + compat_flags = read_varint(f_in); + if (compat_flags & CF_VARINT_FLIST_FLAGS) + do_negotiated_strings = 1; + } + /* The inc_recurse var MUST be set to 0 or 1. */ + inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0; + want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM); + proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0; + xfer_flags_as_varint = compat_flags & CF_VARINT_FLIST_FLAGS ? 1 : 0; + xmit_id0_names = compat_flags & CF_ID0_NAMES ? 1 : 0; + if (!xfer_flags_as_varint && preserve_crtimes) { + fprintf(stderr, "Both rsync versions must be at least 3.2.0 for --crtimes.\n"); + exit_cleanup(RERR_PROTOCOL); + } + if (am_sender) { + receiver_symlink_times = am_server + ? strchr(client_info, 'L') != NULL + : !!(compat_flags & CF_SYMLINK_TIMES); + } +#ifdef CAN_SET_SYMLINK_TIMES + else + receiver_symlink_times = 1; +#endif +#ifdef ICONV_OPTION + sender_symlink_iconv = iconv_opt && (am_server + ? strchr(client_info, 's') != NULL + : !!(compat_flags & CF_SYMLINK_ICONV)); +#endif + if (inc_recurse && !allow_inc_recurse) { + /* This should only be able to happen in a batch. */ + fprintf(stderr, + "Incompatible options specified for inc-recursive %s.\n", + read_batch ? "batch file" : "connection"); + exit_cleanup(RERR_SYNTAX); + } + use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31; + need_messages_from_generator = 1; + if (compat_flags & CF_INPLACE_PARTIAL_DIR) + inplace_partial = 1; +#ifdef CAN_SET_SYMLINK_TIMES + } else if (!am_sender) { + receiver_symlink_times = 1; +#endif + } + + if (read_batch) + do_negotiated_strings = 0; + + if (need_unsorted_flist && (!am_sender || inc_recurse)) + unsort_ndx = ++file_extra_cnt; + + if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) { + int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY; + if (!am_sender || protocol_version >= 30) + rflags |= FILTRULE_PERISHABLE; + parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0); + } + + +#ifdef ICONV_OPTION + if (protect_args && files_from) { + if (am_sender) + filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1; + else + filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1; + } +#endif + + negotiate_the_strings(f_in, f_out); + + if (am_server) { + if (!checksum_seed) + checksum_seed = time(NULL) ^ (getpid() << 6); + write_int(f_out, checksum_seed); + } else { + checksum_seed = read_int(f_in); + } + + parse_checksum_choice(1); /* Sets file_sum_nni & xfer_sum_nni */ + parse_compress_choice(1); /* Sets do_compression */ + + /* TODO in the future allow this algorithm to be chosen somehow, but it can't get too + * long or the size starts to cause a problem in the xattr abbrev/non-abbrev code. */ + xattr_sum_nni = parse_csum_name(NULL, 0); + xattr_sum_len = csum_len_for_type(xattr_sum_nni->num, 0); + + if (write_batch && !am_server) + write_batch_shell_file(); + + init_flist(); +} + +void output_daemon_greeting(int f_out, int am_client) +{ + char tmpbuf[MAX_NSTR_STRLEN]; + int our_sub = get_subprotocol_version(); + + get_default_nno_list(&valid_auth_checksums, tmpbuf, MAX_NSTR_STRLEN, '\0'); + + io_printf(f_out, "@RSYNCD: %d.%d %s\n", protocol_version, our_sub, tmpbuf); + + if (am_client && DEBUG_GTE(NSTR, 2)) + rprintf(FINFO, "Client %s list (on client): %s\n", valid_auth_checksums.type, tmpbuf); +} + +void negotiate_daemon_auth(int f_out, int am_client) +{ + char tmpbuf[MAX_NSTR_STRLEN]; + int save_am_server = am_server; + int md4_is_old = 0; + + if (!am_client) + am_server = 1; + + if (daemon_auth_choices) + strlcpy(tmpbuf, daemon_auth_choices, MAX_NSTR_STRLEN); + else { + strlcpy(tmpbuf, protocol_version >= 30 ? "md5" : "md4", MAX_NSTR_STRLEN); + md4_is_old = 1; + } + + if (am_client) { + recv_negotiate_str(-1, &valid_auth_checksums, tmpbuf, strlen(tmpbuf)); + if (DEBUG_GTE(NSTR, 1)) { + rprintf(FINFO, "Client negotiated %s: %s\n", valid_auth_checksums.type, + valid_auth_checksums.negotiated_nni->name); + } + } else { + if (!parse_negotiate_str(&valid_auth_checksums, tmpbuf)) { + get_default_nno_list(&valid_auth_checksums, tmpbuf, MAX_NSTR_STRLEN, '\0'); + io_printf(f_out, "@ERROR: your client does not support one of our daemon-auth checksums: %s\n", + tmpbuf); + exit_cleanup(RERR_UNSUPPORTED); + } + } + am_server = save_am_server; + if (md4_is_old && valid_auth_checksums.negotiated_nni->num == CSUM_MD4) + valid_auth_checksums.negotiated_nni->num = CSUM_MD4_OLD; +} + +int get_subprotocol_version() +{ +#if SUBPROTOCOL_VERSION != 0 + return protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; +#else + return 0; +#endif +} |