41979ff87c
socket is multiplexed. This allows clients sending new options which the remote server doesn't understand to get a sensible error message.
411 lines
8.4 KiB
C
411 lines
8.4 KiB
C
/*
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* the socket based protocol for setting up a connection wit rsyncd */
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#include "rsync.h"
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extern int module_id;
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extern int read_only;
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extern int verbose;
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extern int rsync_port;
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int start_socket_client(char *host, char *path, int argc, char *argv[])
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{
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int fd, i;
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char *sargs[MAX_ARGS];
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int sargc=0;
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char line[MAXPATHLEN];
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char *p, *user=NULL;
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extern int remote_version;
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extern int am_client;
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extern int am_sender;
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p = strchr(host, '@');
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if (p) {
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user = host;
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host = p+1;
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*p = 0;
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}
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if (!user) user = getenv("USER");
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if (!user) user = getenv("LOGNAME");
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am_client = 1;
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fd = open_socket_out(host, rsync_port);
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if (fd == -1) {
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exit_cleanup(1);
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}
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server_options(sargs,&sargc);
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sargs[sargc++] = ".";
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if (path && *path)
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sargs[sargc++] = path;
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sargs[sargc] = NULL;
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io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
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if (!read_line(fd, line, sizeof(line)-1)) {
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return -1;
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}
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if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
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return -1;
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}
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p = strchr(path,'/');
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if (p) *p = 0;
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io_printf(fd,"%s\n",path);
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if (p) *p = '/';
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while (1) {
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if (!read_line(fd, line, sizeof(line)-1)) {
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return -1;
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}
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if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
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auth_client(fd, user, line+18);
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continue;
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}
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if (strcmp(line,"@RSYNCD: OK") == 0) break;
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rprintf(FINFO,"%s\n", line);
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}
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for (i=0;i<sargc;i++) {
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io_printf(fd,"%s\n", sargs[i]);
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}
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io_printf(fd,"\n");
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if (remote_version > 17 && !am_sender)
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io_start_multiplex_in(fd);
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return client_run(fd, fd, -1, argc, argv);
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}
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static int rsync_module(int fd, int i)
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{
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int argc=0;
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char *argv[MAX_ARGS];
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char **argp;
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char line[MAXPATHLEN];
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uid_t uid = (uid_t)-2;
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gid_t gid = (gid_t)-2;
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char *p;
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char *addr = client_addr(fd);
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char *host = client_name(fd);
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char *name = lp_name(i);
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char *user;
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int start_glob=0;
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int ret;
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char *request=NULL;
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extern int am_sender;
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extern int remote_version;
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extern int am_root;
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if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
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rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
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name, client_name(fd), client_addr(fd));
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io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
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name, client_name(fd), client_addr(fd));
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return -1;
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}
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if (!claim_connection(lp_lock_file(), lp_max_connections())) {
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if (errno) {
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rprintf(FERROR,"failed to open lock file %s : %s\n",
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lp_lock_file(), strerror(errno));
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io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
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lp_lock_file(), strerror(errno));
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} else {
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rprintf(FERROR,"max connections (%d) reached\n",
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lp_max_connections());
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io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
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}
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return -1;
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}
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user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
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if (!user) {
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rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
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name, client_name(fd), client_addr(fd));
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io_printf(fd,"@ERROR: auth failed on module %s\n",name);
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return -1;
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}
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module_id = i;
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if (lp_read_only(i))
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read_only = 1;
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p = lp_uid(i);
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if (!name_to_uid(p, &uid)) {
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if (!isdigit(*p)) {
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rprintf(FERROR,"Invalid uid %s\n", p);
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io_printf(fd,"@ERROR: invalid uid\n");
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return -1;
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}
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uid = atoi(p);
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}
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p = lp_gid(i);
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if (!name_to_gid(p, &gid)) {
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if (!isdigit(*p)) {
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rprintf(FERROR,"Invalid gid %s\n", p);
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io_printf(fd,"@ERROR: invalid gid\n");
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return -1;
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}
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gid = atoi(p);
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}
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p = lp_exclude_from(i);
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add_exclude_file(p, 1, 0);
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p = lp_exclude(i);
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add_exclude_line(p);
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log_open();
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if (chroot(lp_path(i))) {
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rprintf(FERROR,"chroot %s failed\n", lp_path(i));
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io_printf(fd,"@ERROR: chroot failed\n");
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return -1;
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}
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if (chdir("/")) {
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rprintf(FERROR,"chdir %s failed\n", lp_path(i));
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io_printf(fd,"@ERROR: chdir failed\n");
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return -1;
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}
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if (setgid(gid) || getgid() != gid) {
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rprintf(FERROR,"setgid %d failed\n", gid);
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io_printf(fd,"@ERROR: setgid failed\n");
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return -1;
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}
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if (setuid(uid) || getuid() != uid) {
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rprintf(FERROR,"setuid %d failed\n", uid);
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io_printf(fd,"@ERROR: setuid failed\n");
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return -1;
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}
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am_root = (getuid() == 0);
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io_printf(fd,"@RSYNCD: OK\n");
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argv[argc++] = "rsyncd";
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while (1) {
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if (!read_line(fd, line, sizeof(line)-1)) {
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return -1;
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}
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if (!*line) break;
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p = line;
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argv[argc] = strdup(p);
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if (!argv[argc]) {
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return -1;
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}
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if (start_glob) {
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if (start_glob == 1) {
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request = strdup(p);
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start_glob++;
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}
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glob_expand(name, argv, &argc, MAX_ARGS);
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} else {
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argc++;
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}
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if (strcmp(line,".") == 0) {
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start_glob = 1;
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}
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if (argc == MAX_ARGS) {
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return -1;
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}
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}
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ret = parse_arguments(argc, argv);
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if (request) {
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if (*user) {
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rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
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am_sender?"on":"to",
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request, user, host, addr);
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} else {
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rprintf(FINFO,"rsync %s %s from %s (%s)\n",
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am_sender?"on":"to",
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request, host, addr);
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}
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free(request);
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}
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/* don't allow the logs to be flooded too fast */
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if (verbose > 1) verbose = 1;
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argc -= optind;
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argp = argv + optind;
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optind = 0;
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if (remote_version > 17 && am_sender)
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io_start_multiplex_out(fd);
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if (!ret) {
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rprintf(FERROR,"Error parsing options (unsupported option?) - aborting\n");
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exit_cleanup(1);
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}
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start_server(fd, fd, argc, argp);
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return 0;
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}
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/* send a list of available modules to the client. Don't list those
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with "list = False". */
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static void send_listing(int fd)
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{
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int n = lp_numservices();
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int i;
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for (i=0;i<n;i++)
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if (lp_list(i))
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io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
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}
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/* this is called when a socket connection is established to a client
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and we want to start talking. The setup of the system is done from
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here */
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static int start_daemon(int fd)
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{
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char line[200];
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char *motd;
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int i = -1;
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extern char *config_file;
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extern int remote_version;
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if (!lp_load(config_file, 0)) {
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exit_cleanup(1);
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}
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set_socket_options(fd,"SO_KEEPALIVE");
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set_socket_options(fd,lp_socket_options());
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io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
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motd = lp_motd_file();
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if (*motd) {
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FILE *f = fopen(motd,"r");
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while (f && !feof(f)) {
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int len = fread(line, 1, sizeof(line)-1, f);
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if (len > 0) {
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line[len] = 0;
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io_printf(fd,"%s", line);
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}
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}
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if (f) fclose(f);
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io_printf(fd,"\n");
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}
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if (!read_line(fd, line, sizeof(line)-1)) {
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return -1;
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}
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if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
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io_printf(fd,"@ERROR: protocol startup error\n");
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return -1;
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}
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while (i == -1) {
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line[0] = 0;
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if (!read_line(fd, line, sizeof(line)-1)) {
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return -1;
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}
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if (!*line || strcmp(line,"#list")==0) {
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send_listing(fd);
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return -1;
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}
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if (*line == '#') {
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/* it's some sort of command that I don't understand */
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io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
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return -1;
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}
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i = lp_number(line);
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if (i == -1) {
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io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
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return -1;
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}
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}
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return rsync_module(fd, i);
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}
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int daemon_main(void)
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{
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extern char *config_file;
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/* this ensures that we don't call getcwd after the chroot,
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which doesn't work on platforms that use popen("pwd","r")
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for getcwd */
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push_dir("/", 0);
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if (is_a_socket(STDIN_FILENO)) {
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int i;
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/* we are running via inetd - close off stdout and
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stderr so that library functions (and getopt) don't
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try to use them. Redirect them to /dev/null */
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for (i=1;i<3;i++) {
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close(i);
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open("/dev/null", O_RDWR);
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}
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return start_daemon(STDIN_FILENO);
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}
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become_daemon();
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if (!lp_load(config_file, 1)) {
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fprintf(stderr,"failed to load config file %s\n", config_file);
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exit_cleanup(1);
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}
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log_open();
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rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
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start_accept_loop(rsync_port, start_daemon);
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return -1;
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}
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