/* * Routines common to more than one of the rsync processes. * * Copyright (C) 1996 Andrew Tridgell * Copyright (C) 1996 Paul Mackerras * Copyright (C) 2003-2022 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 "ifuncs.h"#if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET#include <libcharset.h>#elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO#include <langinfo.h>#endif extern int dry_run;extern int preserve_acls;extern int preserve_xattrs;extern int preserve_perms;extern int preserve_executability;extern int preserve_mtimes;extern int omit_dir_times;extern int omit_link_times;extern int am_root;extern int am_server;extern int operator_path_resolve;extern int am_daemon;extern int am_sender;extern int am_receiver;extern int am_generator;extern int am_starting_up;extern int allow_8bit_chars;extern int protocol_version;extern int got_kill_signal;extern int called_from_signal_handler;extern int inc_recurse;extern int inplace;extern int flist_eof;extern int file_old_total;extern int keep_dirlinks;extern int make_backups;extern int sanitize_paths;extern struct file_list *cur_flist, *first_flist, *dir_flist;extern struct chmod_mode_struct *daemon_chmod_modes;#ifdef ICONV_OPTIONextern char *iconv_opt;#endif #define UPDATED_OWNER (1<<0)#define UPDATED_GROUP (1<<1)#define UPDATED_MTIME (1<<2)#define UPDATED_ATIME (1<<3)#define UPDATED_ACLS  (1<<4)#define UPDATED_MODE  (1<<5)#define UPDATED_CRTIME (1<<6) #ifdef ICONV_CONSTiconv_t ic_chck = (iconv_t)-1;# ifdef ICONV_OPTIONiconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;# endif static const char *default_charset(void){# if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET	return locale_charset();# elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO	return nl_langinfo(CODESET);# else	return ""; /* Works with (at the very least) gnu iconv... */# endif} void setup_iconv(void){	const char *defset = default_charset();# ifdef ICONV_OPTION	const char *charset;	char *cp;# endif 	if (!am_server && !allow_8bit_chars) {		/* It's OK if this fails... */		ic_chck = iconv_open(defset, defset); 		if (DEBUG_GTE(ICONV, 2)) {			if (ic_chck == (iconv_t)-1) {				rprintf(FINFO,					"msg checking via isprint()"					" (iconv_open(\"%s\", \"%s\") errno: %d)\n",					defset, defset, errno);			} else {				rprintf(FINFO,					"msg checking charset: %s\n",					defset);			}		}	} else		ic_chck = (iconv_t)-1; # ifdef ICONV_OPTION	if (!iconv_opt)		return; 	if ((cp = strchr(iconv_opt, ',')) != NULL) {		if (am_server) /* A local transfer needs this. */			iconv_opt = cp + 1;		else			*cp = '\0';	} 	if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))		charset = defset;	else		charset = iconv_opt; 	if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {		rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",			UTF8_CHARSET, charset);		exit_cleanup(RERR_UNSUPPORTED);	} 	if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {		rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",			charset, UTF8_CHARSET);		exit_cleanup(RERR_UNSUPPORTED);	} 	if (DEBUG_GTE(ICONV, 1)) {		rprintf(FINFO, "[%s] charset: %s\n",			who_am_i(), *charset ? charset : "[LOCALE]");	}# endif} /* This function converts the chars in the "in" xbuf into characters in the * "out" xbuf.  The ".len" chars of the "in" xbuf is used starting from its * ".pos".  The ".size" of the "out" xbuf restricts how many characters can * be stored, starting at its ".pos+.len" position.  Note that the last byte * of the "out" xbuf is not used, which reserves space for a trailing '\0' * (though it is up to the caller to store a trailing '\0', as needed). * * We return a 0 on success or a -1 on error.  An error also sets errno to * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0. * The "in" xbuf is altered to update ".pos" and ".len".  The "out" xbuf has * data appended, and its ".len" incremented (see below for a ".size" note). * * If ICB_CIRCULAR_OUT is set in "flags", the chars going into the "out" xbuf * can wrap around to the start, and the xbuf may have its ".size" reduced * (presumably by 1 byte) if the iconv code doesn't have space to store a * multi-byte character at the physical end of the ".buf" (though no reducing * happens if ".pos" is <= 1, since there is no room to wrap around). * * If ICB_EXPAND_OUT is set in "flags", the "out" xbuf will be allocated if * empty, and (as long as ICB_CIRCULAR_OUT is not set) expanded if too small. * This prevents the return of E2BIG (except for a circular xbuf). * * If ICB_INCLUDE_BAD is set in "flags", any badly-encoded chars are included * verbatim in the "out" xbuf, so EILSEQ will not be returned. * * If ICB_INCLUDE_INCOMPLETE is set in "flags", any incomplete multi-byte * chars are included, which ensures that EINVAL is not returned. * * If ICB_INIT is set, the iconv() conversion state is initialized prior to * processing the characters. */int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags){	ICONV_CONST char *ibuf;	size_t icnt, ocnt, opos;	char *obuf; 	if (!out->size && flags & ICB_EXPAND_OUT) {		size_t siz = ROUND_UP_1024(in->len * 2);		alloc_xbuf(out, siz);	} else if (out->len+1 >= out->size) {		/* There is no room to even start storing data. */		if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {			errno = E2BIG;			return -1;		}		realloc_xbuf(out, out->size + ROUND_UP_1024(in->len * 2));	} 	if (flags & ICB_INIT)		iconv(ic, NULL, 0, NULL, 0); 	ibuf = in->buf + in->pos;	icnt = in->len; 	opos = out->pos + out->len;	if (flags & ICB_CIRCULAR_OUT) {		if (opos >= out->size) {			opos -= out->size;			/* We know that out->pos is not 0 due to the "no room" check			 * above, so this can't go "negative". */			ocnt = out->pos - opos - 1;		} else {			/* Allow the use of all bytes to the physical end of the buffer			 * unless pos is 0, in which case we reserve our trailing '\0'. */			ocnt = out->size - opos - (out->pos ? 0 : 1);		}	} else		ocnt = out->size - opos - 1;	obuf = out->buf + opos; 	while (icnt) {		while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {			if (errno == EINTR)				continue;			if (errno == EINVAL) {				if (!(flags & ICB_INCLUDE_INCOMPLETE))					goto finish;				if (!ocnt)					goto e2big;			} else if (errno == EILSEQ) {				if (!(flags & ICB_INCLUDE_BAD))					goto finish;				if (!ocnt)					goto e2big;			} else if (errno == E2BIG) {				size_t siz;			  e2big:				opos = obuf - out->buf;				if (flags & ICB_CIRCULAR_OUT && out->pos > 1 && opos > out->pos) {					/* We are in a divided circular buffer at the physical					 * end with room to wrap to the start.  If iconv() refused					 * to use one or more trailing bytes in the buffer, we					 * set the size to ignore the unused bytes. */					if (opos < out->size)						reduce_iobuf_size(out, opos);					obuf = out->buf;					ocnt = out->pos - 1;					continue;				}				if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {					errno = E2BIG;					goto finish;				}				siz = ROUND_UP_1024(in->len * 2);				realloc_xbuf(out, out->size + siz);				obuf = out->buf + opos;				ocnt += siz;				continue;			} else {				rsyserr(FERROR, errno, "unexpected error from iconv()");				exit_cleanup(RERR_UNSUPPORTED);			}			*obuf++ = *ibuf++;			ocnt--, icnt--;			if (!icnt)				break;		}	} 	errno = 0;   finish:	opos = obuf - out->buf;	if (flags & ICB_CIRCULAR_OUT && opos < out->pos)		opos += out->size;	out->len = opos - out->pos; 	in->len = icnt;	in->pos = ibuf - in->buf; 	return errno ? -1 : 0;}#endif void send_protected_args(int fd, char *args[]){	int i;#ifdef ICONV_OPTION	int convert = ic_send != (iconv_t)-1;	xbuf outbuf, inbuf; 	if (convert)		alloc_xbuf(&outbuf, 1024);#endif 	for (i = 0; args[i]; i++) {} /* find first NULL */	args[i] = "rsync"; /* set a new arg0 */	if (DEBUG_GTE(CMD, 1))		print_child_argv("protected args:", args + i + 1);	do {		if (!args[i][0])			write_buf(fd, ".", 2);#ifdef ICONV_OPTION		else if (convert) {			INIT_XBUF_STRLEN(inbuf, args[i]);			iconvbufs(ic_send, &inbuf, &outbuf,				  ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);			outbuf.buf[outbuf.len] = '\0';			write_buf(fd, outbuf.buf, outbuf.len + 1);			outbuf.len = 0;		}#endif		else			write_buf(fd, args[i], strlen(args[i]) + 1);	} while (args[++i]);	write_byte(fd, 0); #ifdef ICONV_OPTION	if (convert)		free(outbuf.buf);#endif} int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr, char *buf, int *len_ptr){	int len, iflags = 0;	struct file_list *flist;	uchar fnamecmp_type = FNAMECMP_FNAME;	int ndx;   read_loop:	while (1) {		ndx = read_ndx(f_in); 		if (ndx >= 0)			break;		if (ndx == NDX_DONE)			return ndx;		if (ndx == NDX_DEL_STATS) {			read_del_stats(f_in);			if (am_sender && am_server)				write_del_stats(f_out);			continue;		}		if (!inc_recurse || am_sender) {			int last;			if (first_flist)				last = first_flist->prev->ndx_start + first_flist->prev->used - 1;			else				last = -1;			rprintf(FERROR,				"Invalid file index: %d (%d - %d) [%s]\n",				ndx, NDX_DONE, last, who_am_i());			exit_cleanup(RERR_PROTOCOL);		}		if (ndx == NDX_FLIST_EOF) {			flist_eof = 1;			if (DEBUG_GTE(FLIST, 3))				rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());			write_int(f_out, NDX_FLIST_EOF);			continue;		}		ndx = NDX_FLIST_OFFSET - ndx;		if (ndx < 0 || ndx >= dir_flist->used) {			ndx = NDX_FLIST_OFFSET - ndx;			rprintf(FERROR,				"Invalid dir index: %d (%d - %d) [%s]\n",				ndx, NDX_FLIST_OFFSET,				NDX_FLIST_OFFSET - dir_flist->used + 1,				who_am_i());			exit_cleanup(RERR_PROTOCOL);		} 		if (DEBUG_GTE(FLIST, 2)) {			rprintf(FINFO, "[%s] receiving flist for dir %d\n",				who_am_i(), ndx);		}		/* Send all the data we read for this flist to the generator. */		start_flist_forward(ndx);		flist = recv_file_list(f_in, ndx);		flist->parent_ndx = ndx;		stop_flist_forward();	} 	iflags = protocol_version >= 29 ? read_shortint(f_in)		   : ITEM_TRANSFER | ITEM_MISSING_DATA; 	/* Support the protocol-29 keep-alive style. */	if (protocol_version < 30 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {		if (am_sender)			maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);		goto read_loop;	} 	flist = flist_for_ndx(ndx, "read_ndx_and_attrs");	if (flist != cur_flist) {		cur_flist = flist;		if (am_sender) {			file_old_total = cur_flist->used;			for (flist = first_flist; flist != cur_flist; flist = flist->next)				file_old_total += flist->used;		}	} 	if (iflags & ITEM_BASIS_TYPE_FOLLOWS)		fnamecmp_type = read_byte(f_in);	*type_ptr = fnamecmp_type; 	if (iflags & ITEM_XNAME_FOLLOWS) {		if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)			exit_cleanup(RERR_PROTOCOL); 		/* For a basis type (FNAMECMP_FUZZY and the alt-dest FNAMECMP_FUZZY+N)		 * the xname is a peer-supplied leaf name that the receiver joins to		 * an operator-chosen basedir (--link-dest / --compare-dest /		 * --copy-dest, or the fuzzy dir) and opens as the delta basis.  It		 * must never contain a ".." (or leading "/") that escapes that dir:		 * a malicious sender could otherwise walk the receiver's filesystem		 * -- e.g. --link-dest=/backup with an xname of "../../etc/shadow" --		 * and read an out-of-tree file as the basis (client-side		 * arbitrary-read / FIFO-hang).  Sanitize it always, not only in the		 * daemon (sanitize_paths) case: the operator basedir may legitimately		 * be relative (#915), but the wire-supplied leaf never needs "..".		 * Only the basis types use xname as a path; other ITEM_XNAME_FOLLOWS		 * uses (the hard-link "=> target" display name, which is often empty)		 * are not paths and must be left byte-for-byte. */		if (fnamecmp_type >= FNAMECMP_FUZZY) {			sanitize_path(buf, buf, "", 0, SP_DEFAULT);			len = strlen(buf);		}	} else {		*buf = '\0';		len = -1;	}	*len_ptr = len; 	if (iflags & ITEM_TRANSFER) {		int i = ndx - cur_flist->ndx_start;		if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {			rprintf(FERROR,				"received request to transfer non-regular file: %d [%s]\n",				ndx, who_am_i());			exit_cleanup(RERR_PROTOCOL);		}	} 	*iflag_ptr = iflags;	return ndx;} /*  free a sums struct  */void free_sums(struct sum_struct *s){	if (s->sums) {		free(s->sums);		free(s->sum2_array);	}	free(s);} /* This is only called when we aren't preserving permissions.  Figure out what * the permissions should be and return them merged back into the mode. */mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,		 int exists){	int new_mode;	/* If the file already exists, we'll return the local permissions,	 * possibly tweaked by the --executability option. */	if (exists) {		new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);		if (preserve_executability && S_ISREG(flist_mode)) {			/* If the source file is executable, grant execute			 * rights to everyone who can read, but ONLY if the			 * file isn't already executable. */			if (!(flist_mode & 0111))				new_mode &= ~0111;			else if (!(stat_mode & 0111))				new_mode |= (new_mode & 0444) >> 2;		}	} else {		/* Apply destination default permissions and turn		 * off special permissions. */		new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);	}	return new_mode;} static int same_mtime(struct file_struct *file, STRUCT_STAT *st, int extra_accuracy){#ifdef ST_MTIME_NSEC	uint32 f1_nsec = F_MOD_NSEC_or_0(file);	uint32 f2_nsec = (uint32)st->ST_MTIME_NSEC;#else	uint32 f1_nsec = 0, f2_nsec = 0;#endif 	if (extra_accuracy) /* ignore modify_window when setting the time after a transfer or checksum check */		return file->modtime == st->st_mtime && f1_nsec == f2_nsec; 

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