rsync.c

Rsync 3.0.5 source code

/*
 * Routines common to more than one of the rsync processes.
 *
 * Copyright (C) 1996 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2003-2008 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 verbose;
extern int dry_run;
extern int preserve_acls;
extern int preserve_xattrs;
extern int preserve_perms;
extern int preserve_executability;
extern int preserve_times;
extern int am_root;
extern int am_server;
extern int am_sender;
extern int am_generator;
extern int am_starting_up;
extern int allow_8bit_chars;
extern int protocol_version;
extern int uid_ndx;
extern int gid_ndx;
extern int inc_recurse;
extern int inplace;
extern int flist_eof;
extern int keep_dirlinks;
extern int make_backups;
extern struct file_list *cur_flist, *first_flist, *dir_flist;
extern struct chmod_mode_struct *daemon_chmod_modes;
#ifdef ICONV_OPTION
extern char *iconv_opt;
#endif

#ifdef ICONV_CONST
iconv_t ic_chck = (iconv_t)-1;
# ifdef ICONV_OPTION
iconv_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 (verbose > 3) {
			if (ic_chck == (iconv_t)-1) {
				rprintf(FINFO,
					"note: iconv_open(\"%s\", \"%s\") failed (%d)"
					" -- using isprint() instead of iconv().\n",
					defset, defset, errno);
			} else {
				rprintf(FINFO,
					"note: iconv_open(\"%s\", \"%s\") succeeded.\n",
					defset, defset);
			}
		}
	}

# 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 (verbose > 1) {
		rprintf(FINFO, "%s charset: %s\n",
			am_server ? "server" : "client",
			*charset ? charset : "[LOCALE]");
	}
# endif
}

/* This function converts the characters in the "in" xbuf into characters
 * in the "out" xbuf.  The "len" 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 buffer is never used, which reserves space for a terminating '\0'.
 * 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.   If ICB_EXPAND_OUT is set in
 * "flags", the "out" xbuf will also be allocated if empty, and expanded if
 * too small (so E2BIG will not be returned).  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.  Likewise for ICB_INCLUDE_INCOMPLETE with
 * respect to an incomplete multi-byte char at the end, which ensures that
 * EINVAL is not returned.  Anytime "in.pos" is 0 we will reset the iconv()
 * state prior to processing the characters. */
int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
{
	ICONV_CONST char *ibuf;
	size_t icnt, ocnt;
	char *obuf;

	if (!out->size && flags & ICB_EXPAND_OUT)
		alloc_xbuf(out, 1024);

	if (!in->pos)
		iconv(ic, NULL, 0, NULL, 0);

	ibuf = in->buf + in->pos;
	icnt = in->len;

	obuf = out->buf + (out->pos + out->len);
	ocnt = out->size - (out->pos + out->len) - 1;

	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;
			} else if (errno == EILSEQ) {
				if (!(flags & ICB_INCLUDE_BAD))
					goto finish;
			} else {
				size_t opos = obuf - out->buf;
				if (!(flags & ICB_EXPAND_OUT)) {
					errno = E2BIG;
					goto finish;
				}
				realloc_xbuf(out, out->size + 1024);
				obuf = out->buf + opos;
				ocnt += 1024;
				continue;
			}
			*obuf++ = *ibuf++;
			ocnt--, icnt--;
		}
	}

	errno = 0;

  finish:
	in->len = icnt;
	in->pos = ibuf - in->buf;
	out->len = obuf - out->buf - out->pos;

	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 (verbose > 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);
			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 *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, save_verbose = verbose;

  read_loop:
	while (1) {
		ndx = read_ndx(f_in);

		if (ndx >= 0)
			break;
		if (ndx == NDX_DONE)
			return ndx;
		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;
			send_msg(MSG_FLIST_EOF, "", 0, 0);
			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);
		}

		/* Send everything read from f_in to msg_fd_out. */
		if (verbose > 3) {
			rprintf(FINFO, "[%s] receiving flist for dir %d\n",
				who_am_i(), ndx);
		}
		verbose = 0;
		send_msg_int(MSG_FLIST, ndx);
		start_flist_forward(f_in);
		flist = recv_file_list(f_in);
		flist->parent_ndx = ndx;
		stop_flist_forward();
		verbose = save_verbose;
	}

	iflags = protocol_version >= 29 ? read_shortint(f_in)
		   : ITEM_TRANSFER | ITEM_MISSING_DATA;

	/* Honor the old-style keep-alive indicator. */
	if (protocol_version < 30
	 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
		if (am_sender)
			maybe_send_keepalive();
		goto read_loop;
	}

	cur_flist = flist_for_ndx(ndx, "read_ndx_and_attrs");

	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);
	} else {
		*buf = '\0';
		len = -1;
	}
	*len_ptr = len;