-/*
- Copyright (C) Andrew Tridgell 1998
-
- 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
- (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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-/* the socket based protocol for setting up a connection wit rsyncd */
+/*
+ * The socket based protocol for setting up a connection with rsyncd.
+ *
+ * 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 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"
-extern int module_id;
-extern int read_only;
-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 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 char *config_file;
+extern char *logfile_format;
+extern char *files_from;
+extern char *tmpdir;
+extern struct chmod_mode_struct *chmod_modes;
+extern filter_rule_list daemon_filter_list;
+#ifdef ICONV_OPTION
+extern char *iconv_opt;
+extern iconv_t ic_send, ic_recv;
+#endif
+
+#define MAX_GID_LIST 32
+
+char *auth_user;
+int read_only = 0;
+int module_id = -1;
+struct chmod_mode_struct *daemon_chmod_modes;
+
+/* 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
+
+static gid_t gid_list[MAX_GID_LIST];
+static int gid_count = 0;
-int start_socket_client(char *host, char *path, int argc, char *argv[])
+/* Used when "reverse lookup" is off. */
+const char undetermined_hostname[] = "UNDETERMINED";
+
+/**
+ * Run a client connected to an rsyncd. The alternative to this
+ * function for remote-shell connections is do_cmd().
+ *
+ * After negotiating which module to use and reading the server's
+ * motd, this hands over to client_run(). Telling the server the
+ * module will cause it to chroot/setuid/etc.
+ *
+ * Instead of doing a transfer, the client may at this stage instead
+ * get a listing of remote modules and exit.
+ *
+ * @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, int remote_argc, char *remote_argv[],
+ int argc, char *argv[])
{
- int fd, i;
- char *sargs[MAX_ARGS];
- int sargc=0;
- char line[1024];
- char *p;
- int version;
+ int fd, ret;
+ char *p, *user = NULL;
- fd = open_socket_out(host, rsync_port);
- if (fd == -1) {
- exit_cleanup(1);
+ /* 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 (**remote_argv == '/') {
+ rprintf(FERROR,
+ "ERROR: The remote path must start with a module name not a /\n");
+ return -1;
}
-
- server_options(sargs,&sargc);
- sargs[sargc++] = ".";
+ if ((p = strrchr(host, '@')) != NULL) {
+ user = host;
+ host = p+1;
+ *p = '\0';
+ }
- if (path && *path)
- sargs[sargc++] = path;
+ fd = open_socket_out_wrapped(host, rsync_port, bind_address,
+ default_af_hint);
+ if (fd == -1)
+ exit_cleanup(RERR_SOCKETIO);
- sargs[sargc] = NULL;
+#ifdef ICONV_CONST
+ setup_iconv();
+#endif
- if (!read_line(fd, line, sizeof(line)-1)) {
+ ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
+
+ return ret ? ret : client_run(fd, fd, -1, argc, argv);
+}
+
+static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
+{
+ 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(line,"@RSYNCD: %d", &version) != 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;
}
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ 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;
+ }
- p = strchr(path,'/');
- if (p) *p = 0;
- io_printf(fd,"%s\n",path);
- if (p) *p = '/';
+ 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 *p, *modname;
+
+ assert(argc > 0 && *argv != NULL);
+
+ 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");
+
+ if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
+ return -1;
+
+ /* set daemon_over_rsh to false since we need to build the
+ * true set of args passed through the rsh/ssh connection;
+ * this is a no-op for direct-socket-connection mode */
+ daemon_over_rsh = 0;
+ server_options(sargs, &sargc);
+
+ if (sargc >= MAX_ARGS - 2)
+ goto arg_overflow;
+
+ sargs[sargc++] = ".";
+
+ 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 (DEBUG_GTE(CMD, 1))
+ print_child_argv("sending daemon args:", sargs);
+
+ 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(fd, 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;
}
- if (strcmp(line,"@RSYNCD: OK") == 0) break;
- rprintf(FINFO,"%s\n", line);
+
+ if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
+ auth_client(f_out, user, line+18);
+ continue;
+ }
+
+ if (strcmp(line,"@RSYNCD: OK") == 0)
+ break;
+
+ if (strcmp(line,"@RSYNCD: EXIT") == 0) {
+ /* This is sent by recent versions of the
+ * server to terminate the listing of modules.
+ * We don't want to go on and transfer
+ * anything; just exit. */
+ exit(0);
+ }
+
+ if (strncmp(line, "@ERROR", 6) == 0) {
+ rprintf(FERROR, "%s\n", line);
+ /* This is always fatal; the server will now
+ * close the socket. */
+ return -1;
+ }
+
+ /* 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;
+
+ 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");
+ }
+
+ if (protect_args)
+ send_protected_args(f_out, sargs);
- for (i=0;i<sargc;i++) {
- io_printf(fd,"%s\n", sargs[i]);
+ if (protocol_version < 23) {
+ if (protocol_version == 22 || !am_sender)
+ io_start_multiplex_in(f_in);
}
- io_printf(fd,"\n");
-#if 0
+ 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;
+}
+
+#ifdef HAVE_PUTENV
+static int read_arg_from_pipe(int fd, char *buf, int limit)
+{
+ char *bp = buf, *eob = buf + limit - 1;
+
while (1) {
- if (!read_line(fd, line, sizeof(line)-1)) {
+ int got = read(fd, bp, 1);
+ if (got != 1) {
+ if (got < 0 && errno == EINTR)
+ continue;
return -1;
}
- rprintf(FINFO,"%s\n", line);
+ if (*bp == '\0')
+ break;
+ if (bp < eob)
+ bp++;
}
+ *bp = '\0';
+
+ return bp - buf;
+}
#endif
- return client_run(fd, fd, -1, argc, argv);
+static int path_failure(int f_out, const char *dir, BOOL was_chdir)
+{
+ 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 add_a_group(int f_out, const char *gname)
+{
+ gid_t gid;
+ if (!group_to_gid(gname, &gid, True)) {
+ rprintf(FLOG, "Invalid gid %s\n", gname);
+ io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
+ return -1;
+ }
+ if (gid_count == MAX_GID_LIST) {
+ rprintf(FLOG, "Too many groups specified via gid parameter.\n");
+ io_printf(f_out, "@ERROR: too many groups\n");
+ return -1;
+ }
+ gid_list[gid_count++] = gid;
+ return 0;
+}
+
+#ifdef HAVE_GETGROUPLIST
+static int want_all_groups(int f_out, uid_t uid)
+{
+ const char *err;
+ gid_count = MAX_GID_LIST;
+ if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) {
+ rsyserr(FLOG, errno, "%s", err);
+ io_printf(f_out, "@ERROR: %s\n", err);
+ return -1;
+ }
+ return 0;
+}
+#elif defined HAVE_INITGROUPS
+static struct passwd *want_all_groups(int f_out, uid_t uid)
+{
+ struct passwd *pw;
+ if ((pw = getpwuid(uid)) == NULL) {
+ rsyserr(FLOG, errno, "getpwuid failed");
+ io_printf(f_out, "@ERROR: getpwuid failed\n");
+ return NULL;
+ }
+ /* Start with the default group and initgroups() will add the reset. */
+ gid_count = 1;
+ gid_list[0] = pw->pw_gid;
+ return pw;
}
+#endif
+static void set_env_str(const char *var, const char *str)
+{
+#ifdef HAVE_PUTENV
+ char *mem;
+ if (asprintf(&mem, "%s=%s", var, str) < 0)
+ out_of_memory("set_env_str");
+ putenv(mem);
+#endif
+}
+#ifdef HAVE_PUTENV
+static void set_env_num(const char *var, long num)
+{
+ char *mem;
+ if (asprintf(&mem, "%s=%ld", var, num) < 0)
+ out_of_memory("set_env_num");
+ putenv(mem);
+}
+#endif
-static int rsync_module(int fd, int i)
+static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
{
- int argc=0;
- char *argv[MAX_ARGS];
- char **argp;
- char line[1024];
+ int argc;
+ char **argv, **orig_argv, **orig_early_argv, *module_chdir;
+ char line[BIGPATHBUFLEN];
+#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
+ struct passwd *pw = NULL;
+#endif
uid_t uid;
- gid_t gid;
- char *p;
+ int set_uid;
+ char *p, *err_msg = NULL;
+ char *name = lp_name(i);
+ int use_chroot = lp_use_chroot(i);
+ int ret, pre_exec_fd = -1;
+ int save_munge_symlinks;
+ pid_t pre_exec_pid = 0;
+ char *request = NULL;
- module_id = i;
+ set_env_str("RSYNC_MODULE_NAME", name);
- if (lp_read_only(i))
- read_only = 1;
+#ifdef ICONV_OPTION
+ iconv_opt = lp_charset(i);
+ if (*iconv_opt)
+ setup_iconv();
+ iconv_opt = NULL;
+#endif
- p = lp_uid(i);
- if (!name_to_uid(p, &uid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid uid %s\n", p);
- return -1;
- }
- uid = atoi(p);
- }
+ /* If reverse lookup is disabled globally but enabled for this module,
+ * we need to do it now before the access check. */
+ if (host == undetermined_hostname && lp_reverse_lookup(i))
+ host = client_name(f_in);
+ set_env_str("RSYNC_HOST_NAME", host);
+ set_env_str("RSYNC_HOST_ADDR", addr);
- p = lp_gid(i);
- if (!name_to_gid(p, &gid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid gid %s\n", p);
- return -1;
- }
- gid = atoi(p);
+ 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);
+ if (!lp_list(i))
+ io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
+ else {
+ io_printf(f_out,
+ "@ERROR: access denied to %s from %s (%s)\n",
+ name, host, addr);
+ }
+ return -1;
}
- rprintf(FERROR,"rsyncd starting\n");
+ if (am_daemon && am_server) {
+ rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
+ name, host, addr);
+ }
- if (chroot(lp_path(i))) {
- io_printf(fd,"@ERROR: chroot failed\n");
+ if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
+ if (errno) {
+ rsyserr(FLOG, errno, "failed to open lock file %s",
+ lp_lock_file(i));
+ io_printf(f_out, "@ERROR: failed to open lock file\n");
+ } else {
+ rprintf(FLOG, "max connections (%d) reached\n",
+ lp_max_connections(i));
+ io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
+ lp_max_connections(i));
+ }
return -1;
}
- if (chdir("/")) {
- io_printf(fd,"@ERROR: chdir failed\n");
+ auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
+
+ if (!auth_user) {
+ io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
return -1;
}
+ set_env_str("RSYNC_USER_NAME", auth_user);
- if (setgid(gid)) {
- io_printf(fd,"@ERROR: setgid failed\n");
- return -1;
+ module_id = i;
+
+ if (lp_read_only(i))
+ read_only = 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;
+
+ uid = MY_UID();
+ am_root = (uid == 0);
+
+ p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
+ if (p) {
+ if (!user_to_uid(p, &uid, True)) {
+ rprintf(FLOG, "Invalid uid %s\n", p);
+ io_printf(f_out, "@ERROR: invalid uid %s\n", p);
+ return -1;
+ }
+ set_uid = 1;
+ } else
+ set_uid = 0;
+
+ p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
+ if (p) {
+ /* The "*" gid must be the first item in the list. */
+ if (strcmp(p, "*") == 0) {
+#ifdef HAVE_GETGROUPLIST
+ if (want_all_groups(f_out, uid) < 0)
+ return -1;
+#elif defined HAVE_INITGROUPS
+ if ((pw = want_all_groups(f_out, uid)) == NULL)
+ return -1;
+#else
+ rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
+ io_printf(f_out, "@ERROR: invalid gid setting.\n");
+ return -1;
+#endif
+ } else if (add_a_group(f_out, p) < 0)
+ return -1;
+ while ((p = strtok(NULL, ", ")) != NULL) {
+#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
+ if (pw) {
+ rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
+ io_printf(f_out, "@ERROR: invalid gid setting.\n");
+ return -1;
+ }
+#endif
+ if (add_a_group(f_out, p) < 0)
+ return -1;
+ }
+ } else if (am_root) {
+ if (add_a_group(f_out, NOBODY_GROUP) < 0)
+ return -1;
}
- if (setuid(uid)) {
- io_printf(fd,"@ERROR: setuid failed\n");
+ module_dir = lp_path(i);
+ if (*module_dir == '\0') {
+ rprintf(FLOG, "No path specified for module %s\n", name);
+ io_printf(f_out, "@ERROR: no path setting.\n");
return -1;
}
+ 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;
+ }
+ set_env_str("RSYNC_MODULE_PATH", full_module_path);
- io_printf(fd,"@RSYNCD: OK\n");
+ if (module_dirlen == 1) {
+ module_dirlen = 0;
+ set_filter_dir("/", 1);
+ } else
+ set_filter_dir(module_dir, module_dirlen);
- argv[argc++] = "rsyncd";
+ p = lp_filter(i);
+ parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
+ XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
- while (1) {
- if (!read_line(fd, line, sizeof(line)-1)) {
+ p = lp_include_from(i);
+ parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
+ XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
+
+ p = lp_include(i);
+ parse_filter_str(&daemon_filter_list, p,
+ rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
+ XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
+
+ p = lp_exclude_from(i);
+ parse_filter_file(&daemon_filter_list, p, rule_template(0),
+ XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
+
+ p = lp_exclude(i);
+ parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
+ XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
+
+ log_init(1);
+
+#ifdef HAVE_PUTENV
+ if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
+ int status;
+
+ 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) {
+ set_env_num("RSYNC_PID", (long)pid);
+ if (wait_process(pid, &status, 0) < 0)
+ status = -1;
+ set_env_num("RSYNC_RAW_STATUS", status);
+ if (WIFEXITED(status))
+ status = WEXITSTATUS(status);
+ else
+ status = -1;
+ set_env_num("RSYNC_EXIT_STATUS", status);
+ 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];
+ set_env_num("RSYNC_PID", (long)getpid());
+ 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);
+ set_env_str("RSYNC_REQUEST", buf);
+ 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) {
+ /*
+ * XXX: The 'use chroot' flag is a fairly reliable
+ * source of confusion, because it fails under two
+ * important circumstances: running as non-root,
+ * running on Win32 (or possibly others). On the
+ * other hand, if you are running as root, then it
+ * might be better to always use chroot.
+ *
+ * So, perhaps if we can't chroot we should just issue
+ * a warning, unless a "require chroot" flag is set,
+ * in which case we fail.
+ */
+ 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 (!change_dir(module_chdir, CD_NORMAL))
+ return path_failure(f_out, module_chdir, True);
+ if (module_dirlen || !use_chroot)
+ sanitize_paths = 1;
- if (!*line) break;
+ 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);
+ }
+ }
- argv[argc] = strdup(line);
- if (!argv[argc]) {
+ if (gid_count) {
+ if (setgid(gid_list[0])) {
+ rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
+ io_printf(f_out, "@ERROR: setgid failed\n");
return -1;
}
+#ifdef HAVE_SETGROUPS
+ /* Set the group(s) we want to be active. */
+ if (setgroups(gid_count, gid_list)) {
+ rsyserr(FLOG, errno, "setgroups failed");
+ io_printf(f_out, "@ERROR: setgroups failed\n");
+ return -1;
+ }
+#endif
+#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
+ /* pw is set if the user wants all the user's groups. */
+ if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
+ rsyserr(FLOG, errno, "initgroups failed");
+ io_printf(f_out, "@ERROR: initgroups failed\n");
+ return -1;
+ }
+#endif
+ }
- argc++;
- if (argc == MAX_ARGS) {
+ if (set_uid) {
+ if (setuid(uid) < 0
+#ifdef HAVE_SETEUID
+ || seteuid(uid) < 0
+#endif
+ ) {
+ rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
+ io_printf(f_out, "@ERROR: setuid failed\n");
return -1;
}
+
+ 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");
+
+ read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
+ orig_argv = argv;
+
+ save_munge_symlinks = munge_symlinks;
+
+ 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;
+
+ munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
+
+ if (pre_exec_pid) {
+ err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
+ orig_early_argv, orig_argv);
}
- parse_arguments(argc, argv);
+ if (orig_early_argv)
+ free(orig_early_argv);
+
+ 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;
+ 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;
+
+ if (request) {
+ if (*auth_user) {
+ rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
+ am_sender ? "on" : "to",
+ request, auth_user, host, addr);
+ } else {
+ rprintf(FLOG, "rsync %s %s from %s (%s)\n",
+ am_sender ? "on" : "to",
+ request, host, addr);
+ }
+ free(request);
+ }
+
+#ifndef DEBUG
/* don't allow the logs to be flooded too fast */
- if (verbose > 1) verbose = 1;
+ limit_output_verbosity(lp_max_verbosity(i));
+#endif
- argc -= optind;
- argp = argv + optind;
- optind = 0;
+ if (protocol_version < 23
+ && (protocol_version == 22 || am_sender))
+ io_start_multiplex_out(f_out);
+ 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. */
+ setup_protocol(f_out, f_in);
+ if (!am_sender) {
+ /* Since we failed in our option parsing, we may not
+ * have finished parsing that the client sent us a
+ * --files-from option, so look for it manually.
+ * Without this, the socket would be in the wrong
+ * state for the upcoming error message. */
+ if (!files_from) {
+ int i;
+ for (i = 0; i < argc; i++) {
+ if (strncmp(argv[i], "--files-from", 12) == 0) {
+ files_from = "";
+ break;
+ }
+ }
+ }
+ if (files_from)
+ write_byte(f_out, 0);
+ }
+ io_start_multiplex_out(f_out);
+ }
- start_server(fd, fd, argc, argp);
+ if (!ret || err_msg) {
+ if (err_msg)
+ rwrite(FERROR, err_msg, strlen(err_msg), 0);
+ else
+ option_error();
+ msleep(400);
+ exit_cleanup(RERR_UNSUPPORTED);
+ }
+
+#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) && (!io_timeout || 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, argv);
return 0;
}
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++)
+
+ for (i = 0; i < n; i++) {
if (lp_list(i))
- io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
+ io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
+ }
+
+ if (protocol_version >= 25)
+ 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 socket connection is established to a client
+/* 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 */
-static int start_daemon(int fd)
+int start_daemon(int f_in, int f_out)
{
- char line[200];
- char *motd;
- int version;
- int i = -1;
+ char line[1024];
+ const char *addr, *host;
+ int i;
+
+ io_set_sock_fds(f_in, f_out);
+
+ /* 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);
+
+ addr = client_addr(f_in);
+ host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
+ rprintf(FLOG, "connect from %s (%s)\n", host, addr);
+
+ if (!am_server) {
+ set_socket_options(f_in, "SO_KEEPALIVE");
+ set_nonblocking(f_in);
+ }
+
+ if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
+ return -1;
- set_socket_options(fd,"SO_KEEPALIVE");
+ line[0] = 0;
+ if (!read_line_old(f_in, line, sizeof line))
+ return -1;
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ if (!*line || strcmp(line, "#list") == 0) {
+ rprintf(FLOG, "module-list request from %s (%s)\n",
+ host, addr);
+ send_listing(f_out);
+ return -1;
+ }
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (*line == '#') {
+ /* it's some sort of command that I don't understand */
+ io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
return -1;
}
- if (sscanf(line,"@RSYNCD: %d", &version) != 1) {
+ if ((i = lp_number(line)) < 0) {
+ 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;
- }
-
- motd = lp_motd_file();
- if (*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(fd,"%s", line);
- }
- }
- if (f) fclose(f);
- io_printf(fd,"\n");
}
- while (i == -1) {
+#ifdef HAVE_SIGACTION
+ sigact.sa_flags = SA_NOCLDSTOP;
+#endif
+ SIGACTION(SIGCHLD, remember_children);
- line[0] = 0;
- if (!read_line(fd, line, sizeof(line)-1)) {
- return -1;
- }
+ return rsync_module(f_in, f_out, i, addr, host);
+}
- if (!*line || strcmp(line,"#list")==0) {
- send_listing(fd);
- return -1;
- }
+static void create_pid_file(void)
+{
+ char *pid_file = lp_pid_file();
+ char pidbuf[16];
+ pid_t pid = getpid();
+ int fd, len;
- if (*line == '#') {
- /* it's some sort of command that I don't understand */
- io_printf(fd,"ERROR: Unknown command '%s'\n", line);
- return -1;
- }
+ if (!pid_file || !*pid_file)
+ return;
- i = lp_number(line);
- if (i == -1) {
- io_printf(fd,"ERROR: Unknown module '%s'\n", line);
- return -1;
+ 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);
+}
+
+/* Become a daemon, discarding the controlling terminal. */
+static void become_daemon(void)
+{
+ 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);
}
- return rsync_module(fd, i);
-}
+ 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)
{
- extern char *config_file;
+ if (is_a_socket(STDIN_FILENO)) {
+ int i;
+
+ /* we are running via inetd - close off stdout and
+ * stderr so that library functions (and getopt) don't
+ * try to use them. Redirect them to /dev/null */
+ for (i = 1; i < 3; i++) {
+ close(i);
+ open("/dev/null", O_RDWR);
+ }
- if (!lp_load(config_file)) {
- exit_cleanup(1);
+ return start_daemon(STDIN_FILENO, STDIN_FILENO);
}
- if (is_a_socket(STDIN_FILENO)) {
- /* we are running via inetd */
- return start_daemon(STDIN_FILENO);
+ if (!load_config(1)) {
+ fprintf(stderr, "Failed to parse config file: %s\n", config_file);
+ exit_cleanup(RERR_SYNTAX);
}
+ set_dparams(0);
- become_daemon();
+ 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(0);
+
+ rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
+ RSYNC_VERSION, rsync_port);
+ /* TODO: If listening on a particular address, then show that
+ * address too. In fact, why not just do inet_ntop on the
+ * local address??? */
start_accept_loop(rsync_port, start_daemon);
return -1;
}
-