X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/180443af42778dd0209fb76e08e4cbb33fec5e09..b3bf9b9df95137a3a43248be9599d919b04877af:/clientserver.c

diff --git a/clientserver.c b/clientserver.c
index 5286927c..09fd315a 100644
--- a/clientserver.c
+++ b/clientserver.c
@@ -1,11 +1,13 @@
-/* -*- c-file-style: "linux"; -*-
+/*
+ * The socket based protocol for setting up a connection with rsyncd.
  *
- * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
- * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org>
+ * Copyright (C) 1998-2001 Andrew Tridgell <tridge@samba.org>
+ * Copyright (C) 2001-2002 Martin Pool <mbp@samba.org>
+ * 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 2 of the License, or
+ * 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,
@@ -13,52 +15,72 @@
  * 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, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, visit the http://fsf.org website.
  */
 
-/**
- * @file
- *
- * The socket based protocol for setting up a connection with
- * rsyncd.
- **/
-
 #include "rsync.h"
+#include "itypes.h"
 
-extern int verbose;
+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 select_timeout;
-extern int orig_umask;
 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 mode_t orig_umask;
 extern char *bind_address;
-extern struct filter_list_struct server_filter_list;
 extern char *config_file;
+extern char *logfile_format;
 extern char *files_from;
+extern char *tmpdir;
+extern struct chmod_mode_struct *chmod_modes;
+extern struct filter_list_struct daemon_filter_list;
+extern char curr_dir[MAXPATHLEN];
+#ifdef ICONV_OPTION
+extern char *iconv_opt;
+extern iconv_t ic_send, ic_recv;
+#endif
 
 char *auth_user;
 int read_only = 0;
-int daemon_log_format_has_i = 0;
-int daemon_log_format_has_o_or_i = 0;
 int module_id = -1;
+struct chmod_mode_struct *daemon_chmod_modes;
 
-/* Length of lp_path() string when in daemon mode & not chrooted, else 0. */
+/* 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
+
 /**
  * Run a client connected to an rsyncd.  The alternative to this
  * function for remote-shell connections is do_cmd().
@@ -73,7 +95,8 @@ unsigned int module_dirlen = 0;
  * @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, char *path, int argc, char *argv[])
+int start_socket_client(char *host, int remote_argc, char *remote_argv[],
+			int argc, char *argv[])
 {
 	int fd, ret;
 	char *p, *user = NULL;
@@ -81,7 +104,7 @@ int start_socket_client(char *host, char *path, int argc, char *argv[])
 	/* 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 (*path == '/') {
+	if (**remote_argv == '/') {
 		rprintf(FERROR,
 			"ERROR: The remote path must start with a module name not a /\n");
 		return -1;
@@ -98,52 +121,123 @@ int start_socket_client(char *host, char *path, int argc, char *argv[])
 	if (fd == -1)
 		exit_cleanup(RERR_SOCKETIO);
 
-	ret = start_inband_exchange(user, path, fd, fd, argc);
+#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);
 }
 
-int start_inband_exchange(char *user, char *path, int f_in, int f_out, 
-			  int argc)
+static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
 {
-	int i;
+	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)) {
+		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 line[MAXPATHLEN];
-	char *p;
+	char *p, *modname;
 
-	if (argc == 0 && !am_sender)
-		list_only |= 1;
+	assert(argc > 0 && *argv != NULL);
 
-	if (*path == '/') {
+	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");
 
-	io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
-
-	if (!read_line(f_in, line, sizeof line - 1)) {
-		rprintf(FERROR, "rsync: did not see server greeting\n");
-		return -1;
-	}
-
-	if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
-		/* note that read_line strips of \n or \r */
-		rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
-			line);
+	if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
 		return -1;
-	}
-	if (protocol_version > remote_protocol)
-		protocol_version = remote_protocol;
-
-	if (list_only && protocol_version >= 29)
-		list_only |= 2;
 
 	/* set daemon_over_rsh to false since we need to build the
 	 * true set of args passed through the rsh/ssh connection;
@@ -151,27 +245,39 @@ int start_inband_exchange(char *user, char *path, int f_in, int f_out,
 	daemon_over_rsh = 0;
 	server_options(sargs, &sargc);
 
+	if (sargc >= MAX_ARGS - 2)
+		goto arg_overflow;
+
 	sargs[sargc++] = ".";
 
-	if (path && *path)
-		sargs[sargc++] = path;
+	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
+			sargs[sargc++] = *argv;
+		argv++;
+		argc--;
+	}
 
 	sargs[sargc] = NULL;
 
-	if (verbose > 1)
-		print_child_argv(sargs);
+	if (DEBUG_GTE(CMD, 1))
+		print_child_argv("sending daemon args:", sargs);
 
-	p = strchr(path,'/');
-	if (p) *p = 0;
-	io_printf(f_out, "%s\n", path);
-	if (p) *p = '/';
+	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(f_in, line, sizeof line - 1)) {
+		if (!read_line_old(f_in, line, sizeof line)) {
 			rprintf(FERROR, "rsync: didn't get server startup line\n");
 			return -1;
 		}
@@ -199,43 +305,128 @@ int start_inband_exchange(char *user, char *path, int f_in, int f_out,
 			return -1;
 		}
 
-		rprintf(FINFO, "%s\n", line);
+		/* 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;
 
-	for (i = 0; i < sargc; i++) {
-		io_printf(f_out, "%s\n", sargs[i]);
+	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");
 	}
-	io_printf(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();
 	}
 
+	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;
+}
+
+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;
+}
 
-static int rsync_module(int f_in, int f_out, int i)
+static int path_failure(int f_out, const char *dir, BOOL was_chdir)
 {
-	int argc = 0;
-	int maxargs;
-	char **argv;
-	char **argp;
-	char line[MAXPATHLEN];
+	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 rsync_module(int f_in, int f_out, int i, char *addr, char *host)
+{
+	int argc;
+	char **argv, **orig_argv, **orig_early_argv, *module_chdir;
+	char line[BIGPATHBUFLEN];
 	uid_t uid = (uid_t)-2;  /* canonically "nobody" */
 	gid_t gid = (gid_t)-2;
-	char *p;
-	char *addr = client_addr(f_in);
-	char *host = client_name(f_in);
+	char *p, *err_msg = NULL;
 	char *name = lp_name(i);
 	int use_chroot = lp_use_chroot(i);
-	int start_glob = 0;
-	int ret;
+	int ret, pre_exec_fd = -1;
+	int save_munge_symlinks;
+	pid_t pre_exec_pid = 0;
 	char *request = NULL;
 
+#ifdef ICONV_OPTION
+	iconv_opt = lp_charset(i);
+	if (*iconv_opt)
+		setup_iconv();
+	iconv_opt = NULL;
+#endif
+
 	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
 		rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
 			name, host, addr);
@@ -257,7 +448,7 @@ static int rsync_module(int f_in, int f_out, int i)
 	if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
 		if (errno) {
 			rsyserr(FLOG, errno, "failed to open lock file %s",
-				safe_fname(lp_lock_file(i)));
+				lp_lock_file(i));
 			io_printf(f_out, "@ERROR: failed to open lock file\n");
 		} else {
 			rprintf(FLOG, "max connections (%d) reached\n",
@@ -268,11 +459,9 @@ static int rsync_module(int f_in, int f_out, int i)
 		return -1;
 	}
 
-	auth_user = auth_server(f_in, f_out, i, addr, "@RSYNCD: AUTHREQD ");
+	auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
 
 	if (!auth_user) {
-		rprintf(FLOG, "auth failed on module %s from %s (%s)\n",
-			name, host, addr);
 		io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
 		return -1;
 	}
@@ -282,20 +471,19 @@ static int rsync_module(int f_in, int f_out, int i)
 	if (lp_read_only(i))
 		read_only = 1;
 
-	if (lp_transfer_logging(i)) {
-		if (log_format_has(lp_log_format(i), 'i'))
-			daemon_log_format_has_i = 1;
-		if (daemon_log_format_has_i
-		    || log_format_has(lp_log_format(i), 'o'))
-			daemon_log_format_has_o_or_i = 1;
-	}
+	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;
 
 	am_root = (MY_UID() == 0);
 
 	if (am_root) {
 		p = lp_uid(i);
 		if (!name_to_uid(p, &uid)) {
-			if (!isdigit(*(unsigned char *)p)) {
+			if (!isDigit(p)) {
 				rprintf(FLOG, "Invalid uid %s\n", p);
 				io_printf(f_out, "@ERROR: invalid uid %s\n", p);
 				return -1;
@@ -305,7 +493,7 @@ static int rsync_module(int f_in, int f_out, int i)
 
 		p = lp_gid(i);
 		if (!name_to_gid(p, &gid)) {
-			if (!isdigit(*(unsigned char *)p)) {
+			if (!isDigit(p)) {
 				rprintf(FLOG, "Invalid gid %s\n", p);
 				io_printf(f_out, "@ERROR: invalid gid %s\n", p);
 				return -1;
@@ -321,34 +509,153 @@ static int rsync_module(int f_in, int f_out, int i)
 	/* TODO: Perhaps take a list of gids, and make them into the
 	 * supplementary groups. */
 
-	if (use_chroot || (module_dirlen = strlen(lp_path(i))) == 1) {
+	module_dir = lp_path(i);
+	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;
+	}
+
+	if (module_dirlen == 1) {
 		module_dirlen = 0;
 		set_filter_dir("/", 1);
 	} else
-		set_filter_dir(lp_path(i), module_dirlen);
+		set_filter_dir(module_dir, module_dirlen);
 
 	p = lp_filter(i);
-	parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
-		   XFLG_ANCHORED2ABS);
+	parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
+		   XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
 
 	p = lp_include_from(i);
-	parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
-	    XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
+	parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
+	    XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
 
 	p = lp_include(i);
-	parse_rule(&server_filter_list, p,
+	parse_rule(&daemon_filter_list, p,
 		   MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
-		   XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES);
+		   XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
 
 	p = lp_exclude_from(i);
-	parse_filter_file(&server_filter_list, p, 0,
-	    XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
+	parse_filter_file(&daemon_filter_list, p, 0,
+	    XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
 
 	p = lp_exclude(i);
-	parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
-		   XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES);
+	parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
+		   XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
+
+	log_init(1);
 
-	log_init();
+#ifdef HAVE_PUTENV
+	if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
+		char *modname, *modpath, *hostaddr, *hostname, *username;
+		int status;
+
+		if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
+		 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
+		 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
+		 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
+		 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
+			out_of_memory("rsync_module");
+		putenv(modname);
+		putenv(modpath);
+		putenv(hostaddr);
+		putenv(hostname);
+		putenv(username);
+		umask(orig_umask);
+		/* 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) {
+				if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
+					putenv(p);
+				if (wait_process(pid, &status, 0) < 0)
+					status = -1;
+				if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
+					putenv(p);
+				if (WIFEXITED(status))
+					status = WEXITSTATUS(status);
+				else
+					status = -1;
+				if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
+					putenv(p);
+				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];
+			if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
+				putenv(p);
+			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);
+				if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
+					putenv(p);
+				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];
+		}
+		umask(0);
+	}
+#endif
 
 	if (use_chroot) {
 		/*
@@ -363,28 +670,31 @@ static int rsync_module(int f_in, int f_out, int i)
 		 * a warning, unless a "require chroot" flag is set,
 		 * in which case we fail.
 		 */
-		if (chroot(lp_path(i))) {
-			rsyserr(FLOG, errno, "chroot %s failed",
-				safe_fname(lp_path(i)));
+		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 (!push_dir("/")) {
-			rsyserr(FLOG, errno, "chdir %s failed\n",
-				safe_fname(lp_path(i)));
-			io_printf(f_out, "@ERROR: chdir failed\n");
-			return -1;
-		}
+	if (!change_dir(module_chdir, CD_NORMAL))
+		return path_failure(f_out, module_chdir, True);
+	if (module_dirlen || !use_chroot)
+		sanitize_paths = 1;
 
-	} else {
-		if (!push_dir(lp_path(i))) {
-			rsyserr(FLOG, errno, "chdir %s failed\n",
-				safe_fname(lp_path(i)));
-			io_printf(f_out, "@ERROR: chdir failed\n");
-			return -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);
 		}
-		sanitize_paths = 1;
 	}
 
 	if (am_root) {
@@ -422,46 +732,57 @@ static int rsync_module(int f_in, int f_out, int i)
 		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");
 
-	maxargs = MAX_ARGS;
-	if (!(argv = new_array(char *, maxargs)))
-		out_of_memory("rsync_module");
-	argv[argc++] = "rsyncd";
+	read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
+	orig_argv = argv;
 
-	while (1) {
-		if (!read_line(f_in, line, sizeof line - 1))
-			return -1;
+	save_munge_symlinks = munge_symlinks;
 
-		if (!*line)
-			break;
+	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;
 
-		p = line;
+	munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
 
-		if (argc == maxargs) {
-			maxargs += MAX_ARGS;
-			if (!(argv = realloc_array(argv, char *, maxargs)))
-				out_of_memory("rsync_module");
-		}
-		if (!(argv[argc] = strdup(p)))
-			out_of_memory("rsync_module");
+	if (pre_exec_pid) {
+		err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
+					  orig_early_argv, orig_argv);
+	}
 
-		if (start_glob) {
-			if (start_glob == 1) {
-				request = strdup(p);
-				start_glob++;
-			}
-			glob_expand(name, &argv, &argc, &maxargs);
-		} else
-			argc++;
+	if (orig_early_argv)
+		free(orig_early_argv);
 
-		if (strcmp(line, ".") == 0)
-			start_glob = 1;
-	}
+	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;
 
-	verbose = 0; /* future verbosity is controlled by client options */
-	argp = argv;
-	ret = parse_arguments(&argc, (const char ***) &argp, 0);
+	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;
@@ -481,14 +802,13 @@ static int rsync_module(int f_in, int f_out, int i)
 
 #ifndef DEBUG
 	/* don't allow the logs to be flooded too fast */
-	if (verbose > lp_max_verbosity())
-		verbose = lp_max_verbosity();
+	limit_output_verbosity(lp_max_verbosity(i));
 #endif
 
 	if (protocol_version < 23
 	    && (protocol_version == 22 || am_sender))
 		io_start_multiplex_out();
-	else if (!ret) {
+	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. */
@@ -514,19 +834,49 @@ static int rsync_module(int f_in, int f_out, int i)
 		io_start_multiplex_out();
 	}
 
-	if (!ret) {
-		option_error();
+	if (!ret || err_msg) {
+		if (err_msg)
+			rwrite(FERROR, err_msg, strlen(err_msg), 0);
+		else
+			option_error();
 		msleep(400);
 		exit_cleanup(RERR_UNSUPPORTED);
 	}
 
-	if (lp_timeout(i)) {
-		io_timeout = lp_timeout(i);
-		if (io_timeout < select_timeout)
-			select_timeout = io_timeout;
+#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) && 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, argp);
+	start_server(f_in, f_out, argc, argv);
 
 	return 0;
 }
@@ -535,7 +885,7 @@ static int rsync_module(int f_in, int f_out, int i)
    with "list = False". */
 static void send_listing(int fd)
 {
-	int n = lp_numservices();
+	int n = lp_num_modules();
 	int i;
 
 	for (i = 0; i < n; i++) {
@@ -547,60 +897,54 @@ static void send_listing(int fd)
 		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;
+		else
+			config_file = RSYNCD_SYSCONF;
+	}
+	return lp_load(config_file, globals_only);
+}
+
 /* this is called when a connection is established to a client
    and we want to start talking. The setup of the system is done from
    here */
 int start_daemon(int f_in, int f_out)
 {
-	char line[200];
-	char *motd;
+	char line[1024];
+	char *addr, *host;
 	int i;
 
 	io_set_sock_fds(f_in, f_out);
 
-	if (!lp_load(config_file, 0))
+	/* We must load the config file before calling any function that
+	 * might cause log-file output to occur.  This ensures that the
+	 * "log file" param gets honored for the 2 non-forked use-cases
+	 * (when rsync is run by init and run by a remote shell). */
+	if (!load_config(0))
 		exit_cleanup(RERR_SYNTAX);
 
-	log_init();
+	addr = client_addr(f_in);
+	host = client_name(f_in);
+	rprintf(FLOG, "connect from %s (%s)\n", host, addr);
 
 	if (!am_server) {
 		set_socket_options(f_in, "SO_KEEPALIVE");
-		set_socket_options(f_in, lp_socket_options());
 		set_nonblocking(f_in);
 	}
 
-	io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
-
-	motd = lp_motd_file();
-	if (motd && *motd) {
-		FILE *f = fopen(motd,"r");
-		while (f && !feof(f)) {
-			int len = fread(line, 1, sizeof line - 1, f);
-			if (len > 0) {
-				line[len] = 0;
-				io_printf(f_out, "%s", line);
-			}
-		}
-		if (f)
-			fclose(f);
-		io_printf(f_out, "\n");
-	}
-
-	if (!read_line(f_in, line, sizeof line - 1))
+	if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
 		return -1;
 
-	if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
-		io_printf(f_out, "@ERROR: protocol startup error\n");
-		return -1;
-	}
-	if (protocol_version > remote_protocol)
-		protocol_version = remote_protocol;
-
 	line[0] = 0;
-	if (!read_line(f_in, line, sizeof line - 1))
+	if (!read_line_old(f_in, line, sizeof line))
 		return -1;
 
 	if (!*line || strcmp(line, "#list") == 0) {
+		rprintf(FLOG, "module-list request from %s (%s)\n",
+			host, addr);
 		send_listing(f_out);
 		return -1;
 	}
@@ -612,22 +956,81 @@ int start_daemon(int f_in, int f_out)
 	}
 
 	if ((i = lp_number(line)) < 0) {
-		char *addr = client_addr(f_in);
-		char *host = client_name(f_in);
 		rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
 			line, host, addr);
 		io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
 		return -1;
 	}
 
-	return rsync_module(f_in, f_out, i);
+#ifdef HAVE_SIGACTION
+	sigact.sa_flags = SA_NOCLDSTOP;
+#endif
+	SIGACTION(SIGCHLD, remember_children);
+
+	return rsync_module(f_in, f_out, i, addr, host);
 }
 
+static void create_pid_file(void)
+{
+	char *pid_file = lp_pid_file();
+	char pidbuf[16];
+	pid_t pid = getpid();
+	int fd, len;
+
+	if (!pid_file || !*pid_file)
+		return;
+
+	cleanup_set_pid(pid);
+	if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
+	  failure:
+		cleanup_set_pid(0);
+		fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
+		rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
+		exit_cleanup(RERR_FILEIO);
+	}
+	snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
+	len = strlen(pidbuf);
+	if (write(fd, pidbuf, len) != len)
+		goto failure;
+	close(fd);
+}
 
-int daemon_main(void)
+/* Become a daemon, discarding the controlling terminal. */
+static void become_daemon(void)
 {
-	char *pid_file;
+	int i;
+	pid_t pid = fork();
 
+	if (pid) {
+		if (pid < 0) {
+			fprintf(stderr, "failed to fork: %s\n", strerror(errno));
+			exit_cleanup(RERR_FILEIO);
+		}
+		_exit(0);
+	}
+
+	create_pid_file();
+
+	/* detach from the terminal */
+#ifdef HAVE_SETSID
+	setsid();
+#elif defined TIOCNOTTY
+	i = open("/dev/tty", O_RDWR);
+	if (i >= 0) {
+		ioctl(i, (int)TIOCNOTTY, (char *)0);
+		close(i);
+	}
+#endif
+	/* make sure that stdin, stdout an stderr don't stuff things
+	 * up (library functions, for example) */
+	for (i = 0; i < 3; i++) {
+		close(i);
+		open("/dev/null", O_RDWR);
+	}
+}
+
+int daemon_main(void)
+{
 	if (is_a_socket(STDIN_FILENO)) {
 		int i;
 
@@ -642,18 +1045,23 @@ int daemon_main(void)
 		return start_daemon(STDIN_FILENO, STDIN_FILENO);
 	}
 
-	if (!no_detach)
-		become_daemon();
-
-	if (!lp_load(config_file, 1))
+	if (!load_config(1)) {
+		fprintf(stderr, "Failed to parse config file: %s\n", config_file);
 		exit_cleanup(RERR_SYNTAX);
+	}
+	set_dparams(0);
+
+	if (no_detach)
+		create_pid_file();
+	else
+		become_daemon();
 
 	if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
 		rsync_port = RSYNC_PORT;
 	if (bind_address == NULL && *lp_bind_address())
 		bind_address = lp_bind_address();
 
-	log_init();
+	log_init(0);
 
 	rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
 		RSYNC_VERSION, rsync_port);
@@ -661,23 +1069,6 @@ int daemon_main(void)
 	 * address too.  In fact, why not just do inet_ntop on the
 	 * local address??? */
 
-	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
-		char pidbuf[16];
-		int fd;
-		pid_t pid = getpid();
-		cleanup_set_pid(pid);
-		if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
-					0666 & ~orig_umask)) == -1) {
-			cleanup_set_pid(0);
-			rsyserr(FLOG, errno, "failed to create pid file %s",
-				safe_fname(pid_file));
-			exit_cleanup(RERR_FILEIO);
-		}
-		snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
-		write(fd, pidbuf, strlen(pidbuf));
-		close(fd);
-	}
-
 	start_accept_loop(rsync_port, start_daemon);
 	return -1;
 }