-/* -*- c-file-style: "linux"; -*-
- *
- * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
- * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org>
- *
+/*
+ * 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) 2002-2007 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,
* 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.
- */
-
-/**
- * @file
*
- * The socket based protocol for setting up a connection with
- * rsyncd.
- **/
+ * 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"
-extern int module_id;
-extern int read_only;
extern int verbose;
+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;
-char *auth_user;
+extern int ignore_errors;
+extern int kluge_around_eof;
+extern int daemon_over_rsh;
extern int sanitize_paths;
+extern int filesfrom_fd;
+extern int remote_protocol;
+extern int protocol_version;
+extern int io_timeout;
+extern int no_detach;
+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 *sockopts;
+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 server_filter_list;
+extern char curr_dir[];
+
+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, not chrooted, and the path is not "/"; otherwise 0. */
+char *module_dir = NULL;
+unsigned int module_dirlen = 0;
+
+static int rl_nulls = 0;
+
+#ifdef HAVE_SIGACTION
+static struct sigaction sigact;
+#endif
/**
* Run a client connected to an rsyncd. The alternative to this
* 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, char *path, int argc, char *argv[])
+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[MAXPATHLEN];
- char *p, *user=NULL;
- extern int remote_version;
- extern int am_sender;
- extern char *shell_cmd;
- extern int list_only;
- extern int kludge_around_eof;
- extern char *bind_address;
- extern int default_af_hint;
-
- if (argc == 0 && !am_sender) {
- extern int list_only;
- list_only = 1;
- }
-
- /* This is just a friendliness enhancement: if the connection
- * is to an rsyncd then there is no point specifying the -e option.
- * Note that this is only set if the -e was explicitly specified,
- * not if the environment variable just happens to be set.
- * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html
- */
- if (shell_cmd) {
- rprintf(FERROR, "WARNING: --rsh or -e option ignored when "
- "connecting to rsync daemon\n");
- /* continue */
- }
-
- if (*path == '/') {
- rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
+ int fd, ret;
+ char *p, *user = NULL;
+
+ /* 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;
}
- p = strchr(host, '@');
- if (p) {
+ if ((p = strrchr(host, '@')) != NULL) {
user = host;
host = p+1;
- *p = 0;
+ *p = '\0';
}
- if (!user) user = getenv("USER");
- if (!user) user = getenv("LOGNAME");
+ fd = open_socket_out_wrapped(host, rsync_port, bind_address,
+ default_af_hint);
+ if (fd == -1)
+ exit_cleanup(RERR_SOCKETIO);
+
+ set_socket_options(fd, sockopts);
+
+ 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;
- if (verbose >= 2) {
- /* FIXME: If we're going to use a socket program for
- * testing, then this message is wrong. We need to
- * say something like "(except really using %s)" */
- rprintf(FINFO, "opening tcp connection to %s port %d\n",
- host, rsync_port);
+ 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");
+ }
}
- fd = open_socket_out_wrapped (host, rsync_port, bind_address,
- default_af_hint);
- if (fd == -1) {
- exit_cleanup(RERR_SOCKETIO);
+
+ /* 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;
}
-
- server_options(sargs,&sargc);
- sargs[sargc++] = ".";
+ 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 (path && *path)
- sargs[sargc++] = path;
+ 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;
+ }
- sargs[sargc] = NULL;
+ 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;
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ return 0;
+}
- if (!read_line(fd, line, sizeof(line)-1)) {
- rprintf(FERROR, "rsync: did not see server greeting\n");
+int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
+{
+ int i;
+ char line[BIGPATHBUFLEN];
+ char *sargs[MAX_ARGS];
+ int sargc = 0;
+ char *p, *path = *argv;
+
+ if (argc == 0 && !am_sender)
+ list_only |= 1;
+
+ if (*path == '/') {
+ rprintf(FERROR,
+ "ERROR: The remote path must start with a module name\n");
return -1;
}
- if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
- /* note that read_line strips of \n or \r */
- rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
- line);
+ 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);
+ }
+ sargs[sargc++] = *argv++;
+ argc--;
}
- p = strchr(path,'/');
- if (p) *p = 0;
- io_printf(fd,"%s\n",path);
+ sargs[sargc] = NULL;
+
+ if (verbose > 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 = '/';
/* Old servers may just drop the connection here,
rather than sending a proper EXIT command. Yuck. */
- kludge_around_eof = list_only && (remote_version < 25);
+ 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 (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
- auth_client(fd, user, line+18);
+ auth_client(f_out, user, line+18);
continue;
}
- if (strcmp(line,"@RSYNCD: OK") == 0) break;
+ if (strcmp(line,"@RSYNCD: OK") == 0)
+ break;
if (strcmp(line,"@RSYNCD: EXIT") == 0) {
/* This is sent by recent versions of the
exit(0);
}
- if (strncmp(line, "@ERROR", 6) == 0)
- rprintf(FERROR,"%s\n", line);
- else
- rprintf(FINFO,"%s\n", line);
+ 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);
}
- kludge_around_eof = False;
+ kluge_around_eof = 0;
- for (i=0;i<sargc;i++) {
- io_printf(fd,"%s\n", sargs[i]);
+ if (rl_nulls) {
+ for (i = 0; i < sargc; i++) {
+ 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(fd,"\n");
- if (remote_version < 23) {
- if (remote_version == 22 || (remote_version > 17 && !am_sender))
- io_start_multiplex_in(fd);
+ if (protocol_version < 23) {
+ if (protocol_version == 22 || !am_sender)
+ io_start_multiplex_in();
}
- return client_run(fd, fd, -1, argc, argv);
+ return 0;
}
+static char *finish_pre_exec(pid_t pid, int fd, char *request,
+ int argc, char *argv[])
+{
+ int j, status = -1;
+
+ if (!request)
+ request = "(NONE)";
+
+ write_buf(fd, request, strlen(request)+1);
+ for (j = 0; j < argc; j++)
+ write_buf(fd, argv[j], strlen(argv[j])+1);
+ 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;
-static int rsync_module(int fd, int i)
+ while (1) {
+ if (read(fd, bp, 1) != 1)
+ 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, char *addr, char *host)
{
- int argc=0;
- char *argv[MAX_ARGS];
- char **argp;
- char line[MAXPATHLEN];
+ int argc, opt_cnt;
+ char **argv;
+ char line[BIGPATHBUFLEN];
uid_t uid = (uid_t)-2; /* canonically "nobody" */
gid_t gid = (gid_t)-2;
- char *p;
- char *addr = client_addr(fd);
- char *host = client_name(fd);
+ char *p, *err_msg = NULL;
char *name = lp_name(i);
int use_chroot = lp_use_chroot(i);
- int start_glob=0;
- int ret;
- char *request=NULL;
- extern int am_sender;
- extern int remote_version;
- extern int am_root;
+ int ret, pre_exec_fd = -1;
+ pid_t pre_exec_pid = 0;
+ char *request = NULL;
if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
- rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
+ rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
name, host, addr);
- io_printf(fd,"@ERROR: access denied to %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;
}
+ if (am_daemon && am_server) {
+ rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
+ name, host, addr);
+ }
+
if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
if (errno) {
- rprintf(FERROR,"failed to open lock file %s : %s\n",
- lp_lock_file(i), strerror(errno));
- io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
- lp_lock_file(i), strerror(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(FERROR,"max connections (%d) reached\n",
+ 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));
- io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
}
return -1;
}
-
- auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
+ auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
if (!auth_user) {
- rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
- name, client_name(fd), client_addr(fd));
- io_printf(fd,"@ERROR: auth failed on module %s\n",name);
- return -1;
+ io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
+ return -1;
}
module_id = i;
- am_root = (getuid() == 0);
+ 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;
+
+ am_root = (MY_UID() == 0);
if (am_root) {
p = lp_uid(i);
if (!name_to_uid(p, &uid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid uid %s\n", p);
- io_printf(fd,"@ERROR: invalid uid %s\n", p);
+ if (!isDigit(p)) {
+ rprintf(FLOG, "Invalid uid %s\n", p);
+ io_printf(f_out, "@ERROR: invalid uid %s\n", p);
return -1;
- }
+ }
uid = atoi(p);
}
p = lp_gid(i);
if (!name_to_gid(p, &gid)) {
- if (!isdigit(*p)) {
- rprintf(FERROR,"Invalid gid %s\n", p);
- io_printf(fd,"@ERROR: invalid gid %s\n", p);
+ if (!isDigit(p)) {
+ rprintf(FLOG, "Invalid gid %s\n", p);
+ io_printf(f_out, "@ERROR: invalid gid %s\n", p);
return -1;
- }
+ }
gid = atoi(p);
}
}
-
- /* TODO: If we're not root, but the configuration requests
- * that we change to some uid other than the current one, then
- * log a warning. */
- /* TODO: Perhaps take a list of gids, and make them into the
- * supplementary groups. */
+ /* TODO: If we're not root, but the configuration requests
+ * that we change to some uid other than the current one, then
+ * log a warning. */
+
+ /* TODO: Perhaps take a list of gids, and make them into the
+ * supplementary groups. */
+
+ /* We do a push_dir() without actually calling chdir() in order
+ * to make sure that the module's path is absolute. After this
+ * check, module_dir will be set to an absolute path. */
+ module_dir = lp_path(i);
+ strlcpy(line, curr_dir, sizeof line);
+ if (!push_dir(module_dir, 1))
+ goto chdir_failed;
+ if (strcmp(curr_dir, module_dir) != 0)
+ module_dir = strdup(curr_dir);
+ push_dir(line, 1); /* Restore curr_dir. */
+
+ if (use_chroot || (module_dirlen = strlen(module_dir)) == 1) {
+ module_dirlen = 0;
+ set_filter_dir("/", 1);
+ } else
+ set_filter_dir(module_dir, module_dirlen);
+
+ p = lp_filter(i);
+ parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
+ XFLG_ABS_IF_SLASH);
p = lp_include_from(i);
- add_exclude_file(p, 1, 1);
+ parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
+ XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
p = lp_include(i);
- add_include_line(p);
+ parse_rule(&server_filter_list, p,
+ MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
+ XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
p = lp_exclude_from(i);
- add_exclude_file(p, 1, 0);
+ parse_filter_file(&server_filter_list, p, 0,
+ XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
p = lp_exclude(i);
- add_exclude_line(p);
-
- log_init();
+ parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
+ XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
+
+ log_init(1);
+
+#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", module_dir) < 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);
+ system(lp_postxfer_exec(i));
+ _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) {
/*
* a warning, unless a "require chroot" flag is set,
* in which case we fail.
*/
- if (chroot(lp_path(i))) {
- rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
- io_printf(fd,"@ERROR: chroot failed\n");
- return -1;
- }
-
- if (!push_dir("/", 0)) {
- rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
- io_printf(fd,"@ERROR: chdir failed\n");
+ if (chroot(module_dir)) {
+ rsyserr(FLOG, errno, "chroot %s failed", module_dir);
+ io_printf(f_out, "@ERROR: chroot failed\n");
return -1;
}
-
+ if (!push_dir("/", 0))
+ goto chdir_failed;
} else {
- if (!push_dir(lp_path(i), 0)) {
- rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
- io_printf(fd,"@ERROR: chdir failed\n");
+ if (!push_dir(module_dir, 0)) {
+ chdir_failed:
+ rsyserr(FLOG, errno, "chdir %s failed\n", module_dir);
+ io_printf(f_out, "@ERROR: chdir failed\n");
return -1;
}
sanitize_paths = 1;
}
if (am_root) {
-#ifdef HAVE_SETGROUPS
- /* Get rid of any supplementary groups this process
- * might have inheristed. */
- if (setgroups(0, NULL)) {
- rsyserr(FERROR, errno, "setgroups failed");
- io_printf(fd, "@ERROR: setgroups failed\n");
- return -1;
- }
-#endif
-
/* XXXX: You could argue that if the daemon is started
* by a non-root user and they explicitly specify a
* gid, then we should try to change to that gid --
* all their supplementary groups. */
if (setgid(gid)) {
- rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
- io_printf(fd,"@ERROR: setgid failed\n");
+ rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
+ io_printf(f_out, "@ERROR: setgid failed\n");
return -1;
}
-
- if (setuid(uid)) {
- rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
- io_printf(fd,"@ERROR: setuid failed\n");
+#ifdef HAVE_SETGROUPS
+ /* Get rid of any supplementary groups this process
+ * might have inheristed. */
+ if (setgroups(1, &gid)) {
+ rsyserr(FLOG, errno, "setgroups failed");
+ io_printf(f_out, "@ERROR: setgroups failed\n");
return -1;
}
+#endif
- am_root = (getuid() == 0);
- }
-
- io_printf(fd,"@RSYNCD: OK\n");
-
- argv[argc++] = "rsyncd";
-
- while (1) {
- if (!read_line(fd, line, sizeof(line)-1)) {
+ if (setuid(uid)) {
+ rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
+ io_printf(f_out, "@ERROR: setuid failed\n");
return -1;
}
- if (!*line) break;
-
- p = line;
+ am_root = (MY_UID() == 0);
+ }
- argv[argc] = strdup(p);
- if (!argv[argc]) {
- return -1;
+ 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;
}
+ }
- if (start_glob) {
- if (start_glob == 1) {
- request = strdup(p);
- start_glob++;
- }
- glob_expand(name, argv, &argc, MAX_ARGS);
- } else {
- argc++;
- }
+ io_printf(f_out, "@RSYNCD: OK\n");
- if (strcmp(line,".") == 0) {
- start_glob = 1;
- }
+ opt_cnt = read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
- if (argc == MAX_ARGS) {
- return -1;
- }
+ if (pre_exec_pid) {
+ err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
+ opt_cnt, argv);
}
- if (sanitize_paths) {
- /*
- * Note that this is applied to all parameters, whether or not
- * they are filenames, but no other legal parameters contain
- * the forms that need to be sanitized so it doesn't hurt;
- * it is not known at this point which parameters are files
- * and which aren't.
- */
- for (i = 1; i < argc; i++) {
- sanitize_path(argv[i], NULL);
- }
- }
+ verbose = 0; /* future verbosity is controlled by client options */
+ ret = parse_arguments(&argc, (const char ***) &argv, 0);
+ am_server = 1; /* Don't let someone try to be tricky. */
+ if (lp_ignore_errors(module_id))
+ ignore_errors = 1;
- argp = argv;
- ret = parse_arguments(&argc, (const char ***) &argp, 0);
+ if (lp_fake_super(i))
+ 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(FINFO,"rsync %s %s from %s@%s (%s)\n",
- am_sender?"on":"to",
+ rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
+ am_sender ? "on" : "to",
request, auth_user, host, addr);
} else {
- rprintf(FINFO,"rsync %s %s from %s (%s)\n",
- am_sender?"on":"to",
+ 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;
+ if (verbose > lp_max_verbosity(i))
+ verbose = lp_max_verbosity(i);
#endif
- if (remote_version < 23) {
- if (remote_version == 22 || (remote_version > 17 && am_sender))
- io_start_multiplex_out(fd);
+ if (protocol_version < 23
+ && (protocol_version == 22 || am_sender))
+ io_start_multiplex_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();
}
-
- /* For later protocol versions, we don't start multiplexing
- * until we've configured nonblocking in start_server. That
- * means we're in a sticky situation now: there's no way to
- * convey errors to the client. */
- /* FIXME: Hold off on reporting option processing errors until
- * we've set up nonblocking and multiplexed IO and can get the
- * message back to them. */
- if (!ret) {
- option_error();
- exit_cleanup(RERR_UNSUPPORTED);
+ 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)) {
- extern int io_timeout;
- io_timeout = lp_timeout(i);
+ 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(fd, fd, argc, argp);
+ start_server(f_in, f_out, argc, argv);
return 0;
}
{
int n = lp_numservices();
int i;
- extern int remote_version;
- 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 (remote_version >= 25)
+ if (protocol_version >= 25)
io_printf(fd,"@RSYNCD: EXIT\n");
}
-/* 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 i = -1;
- extern char *config_file;
- extern int remote_version;
+ 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 (!lp_load(config_file, 0))
exit_cleanup(RERR_SYNTAX);
+
+ 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");
+ if (sockopts)
+ set_socket_options(f_in, sockopts);
+ else
+ set_socket_options(f_in, lp_socket_options());
+ set_nonblocking(f_in);
}
- set_socket_options(fd,"SO_KEEPALIVE");
- set_socket_options(fd,lp_socket_options());
- set_nonblocking(fd);
+ if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
+ return -1;
- io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
+ line[0] = 0;
+ if (!read_line_old(f_in, line, sizeof line))
+ return -1;
- 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(fd,"%s", line);
- }
- }
- if (f) fclose(f);
- io_printf(fd,"\n");
+ 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", &remote_version) != 1) {
- io_printf(fd,"@ERROR: protocol startup error\n");
+ 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;
- }
+ }
- while (i == -1) {
- line[0] = 0;
- if (!read_line(fd, line, sizeof(line)-1)) {
- return -1;
- }
+#ifdef HAVE_SIGACTION
+ sigact.sa_flags = SA_NOCLDSTOP;
+#endif
+ SIGACTION(SIGCHLD, remember_children);
- if (!*line || strcmp(line,"#list")==0) {
- send_listing(fd);
- return -1;
- }
+ return rsync_module(f_in, f_out, i, addr, host);
+}
- if (*line == '#') {
- /* it's some sort of command that I don't understand */
- io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
- return -1;
- }
+static void create_pid_file(void)
+{
+ char *pid_file = lp_pid_file();
+ char pidbuf[16];
+ pid_t pid = getpid();
+ int fd;
+
+ 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) {
+ 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);
+ write(fd, pidbuf, strlen(pidbuf));
+ close(fd);
+}
- i = lp_number(line);
- if (i == -1) {
- io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
- return -1;
+/* 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;
- extern int orig_umask;
- char *pid_file;
- extern int no_detach;
+ if (!config_file) {
+ if (am_server && am_root <= 0)
+ config_file = RSYNCD_USERCONF;
+ else
+ config_file = RSYNCD_SYSCONF;
+ }
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);
+ * 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);
}
- return start_daemon(STDIN_FILENO);
+ return start_daemon(STDIN_FILENO, STDIN_FILENO);
}
- if (!no_detach)
- become_daemon();
-
if (!lp_load(config_file, 1)) {
+ fprintf(stderr, "Failed to parse config file: %s\n", config_file);
exit_cleanup(RERR_SYNTAX);
}
- log_init();
-
- rprintf(FINFO, "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??? */
-
- if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
- char pidbuf[16];
- int fd;
- int pid = (int) 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", pid_file);
- exit_cleanup(RERR_FILEIO);
- }
- snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
- write(fd, pidbuf, strlen(pidbuf));
- close(fd);
- }
+ 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;
}
-