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OS/2 Shareware BBS: 35 Internet
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35-Internet.zip
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rsync221.zip
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clientserver.c
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C/C++ Source or Header
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1999-03-04
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/*
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 */
#include "rsync.h"
extern int module_id;
extern int read_only;
extern int verbose;
extern int rsync_port;
char *auth_user;
int start_socket_client(char *host, char *path, 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_client;
extern int am_sender;
if (*path == '/') {
rprintf(FERROR,"ERROR: The remote path must start with a module name\n");
return -1;
}
p = strchr(host, '@');
if (p) {
user = host;
host = p+1;
*p = 0;
}
if (!user) user = getenv("USER");
if (!user) user = getenv("LOGNAME");
am_client = 1;
fd = open_socket_out(host, rsync_port);
if (fd == -1) {
exit_cleanup(RERR_SOCKETIO);
}
server_options(sargs,&sargc);
sargs[sargc++] = ".";
if (path && *path)
sargs[sargc++] = path;
sargs[sargc] = NULL;
io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
if (!read_line(fd, line, sizeof(line)-1)) {
return -1;
}
if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
return -1;
}
p = strchr(path,'/');
if (p) *p = 0;
io_printf(fd,"%s\n",path);
if (p) *p = '/';
while (1) {
if (!read_line(fd, line, sizeof(line)-1)) {
return -1;
}
if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
auth_client(fd, user, line+18);
continue;
}
if (strcmp(line,"@RSYNCD: OK") == 0) break;
rprintf(FINFO,"%s\n", line);
}
for (i=0;i<sargc;i++) {
io_printf(fd,"%s\n", sargs[i]);
}
io_printf(fd,"\n");
if (remote_version > 17 && !am_sender)
io_start_multiplex_in(fd);
return client_run(fd, fd, -1, argc, argv);
}
static int rsync_module(int fd, int i)
{
int argc=0;
char *argv[MAX_ARGS];
char **argp;
char line[MAXPATHLEN];
uid_t uid = (uid_t)-2;
gid_t gid = (gid_t)-2;
char *p;
char *addr = client_addr(fd);
char *host = client_name(fd);
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;
if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
name, client_name(fd), client_addr(fd));
io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
name, client_name(fd), client_addr(fd));
return -1;
}
if (!claim_connection(lp_lock_file(), lp_max_connections())) {
if (errno) {
rprintf(FERROR,"failed to open lock file %s : %s\n",
lp_lock_file(), strerror(errno));
io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
lp_lock_file(), strerror(errno));
} else {
rprintf(FERROR,"max connections (%d) reached\n",
lp_max_connections());
io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
}
return -1;
}
auth_user = auth_server(fd, i, 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;
}
module_id = i;
if (lp_read_only(i))
read_only = 1;
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\n");
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\n");
return -1;
}
gid = atoi(p);
}
p = lp_include_from(i);
add_exclude_file(p, 1, 1);
p = lp_include(i);
add_include_line(p);
p = lp_exclude_from(i);
add_exclude_file(p, 1, 0);
p = lp_exclude(i);
add_exclude_line(p);
log_open();
if (use_chroot) {
#ifndef __EMX__
if (chroot(lp_path(i))) {
rprintf(FERROR,"chroot %s failed\n", lp_path(i));
io_printf(fd,"@ERROR: chroot failed\n");
return -1;
}
#endif
if (chdir("/")) {
rprintf(FERROR,"chdir %s failed\n", lp_path(i));
io_printf(fd,"@ERROR: chdir failed\n");
return -1;
}
if (setgid(gid) || getgid() != gid) {
rprintf(FERROR,"setgid %d failed\n", gid);
io_printf(fd,"@ERROR: setgid failed\n");
return -1;
}
if (setuid(uid) || getuid() != uid) {
rprintf(FERROR,"setuid %d failed\n", uid);
io_printf(fd,"@ERROR: setuid failed\n");
return -1;
}
} else {
if (!push_dir(lp_path(i), 0)) {
rprintf(FERROR,"chdir %s failed\n", lp_path(i));
io_printf(fd,"@ERROR: chdir failed\n");
return -1;
}
}
am_root = (getuid() == 0);
io_printf(fd,"@RSYNCD: OK\n");
argv[argc++] = "rsyncd";
while (1) {
if (!read_line(fd, line, sizeof(line)-1)) {
return -1;
}
if (!*line) break;
p = line;
argv[argc] = strdup(p);
if (!argv[argc]) {
return -1;
}
if (start_glob) {
if (start_glob == 1) {
request = strdup(p);
start_glob++;
}
glob_expand(name, argv, &argc, MAX_ARGS, !use_chroot);
} else {
argc++;
}
if (strcmp(line,".") == 0) {
start_glob = 1;
}
if (argc == MAX_ARGS) {
return -1;
}
}
if (!use_chroot) {
/*
* 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]);
}
}
ret = parse_arguments(argc, argv);
if (request) {
if (*auth_user) {
rprintf(FINFO,"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",
request, host, addr);
}
free(request);
}
#if !TRIDGE
/* don't allow the logs to be flooded too fast */
if (verbose > 1) verbose = 1;
#endif
argc -= optind;
argp = argv + optind;
optind = 0;
if (remote_version > 17 && am_sender)
io_start_multiplex_out(fd);
if (!ret) {
option_error();
}
if (lp_timeout(i)) {
extern int io_timeout;
io_timeout = lp_timeout(i);
}
start_server(fd, fd, argc, argp);
return 0;
}
/* send a list of available modules to the client. Don't list those
with "list = False". */
static void send_listing(int fd)
{
int n = lp_numservices();
int i;
for (i=0;i<n;i++)
if (lp_list(i))
io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
}
/* this is called when a socket 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)
{
char line[200];
char *motd;
int i = -1;
extern char *config_file;
extern int remote_version;
if (!lp_load(config_file, 0)) {
exit_cleanup(RERR_SYNTAX);
}
set_socket_options(fd,"SO_KEEPALIVE");
set_socket_options(fd,lp_socket_options());
io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
motd = lp_motd_file();
if (motd && *motd) {
FILE *f = fopen(motd,"r");
while (f && !feof(f)) {
int len = fread(line, 1, sizeof(line)-1, f);
if (len > 0) {
line[len] = 0;
io_printf(fd,"%s", line);
}
}
if (f) fclose(f);
io_printf(fd,"\n");
}
if (!read_line(fd, line, sizeof(line)-1)) {
return -1;
}
if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
io_printf(fd,"@ERROR: protocol startup error\n");
return -1;
}
while (i == -1) {
line[0] = 0;
if (!read_line(fd, line, sizeof(line)-1)) {
return -1;
}
if (!*line || strcmp(line,"#list")==0) {
send_listing(fd);
return -1;
}
if (*line == '#') {
/* it's some sort of command that I don't understand */
io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
return -1;
}
i = lp_number(line);
if (i == -1) {
io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
return -1;
}
}
return rsync_module(fd, i);
}
int daemon_main(void)
{
extern char *config_file;
char *pid_file;
/* this ensures that we don't call getcwd after the chroot,
which doesn't work on platforms that use popen("pwd","r")
for getcwd */
push_dir("/", 0);
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);
}
set_nonblocking(STDIN_FILENO);
return start_daemon(STDIN_FILENO);
}
become_daemon();
if (!lp_load(config_file, 1)) {
fprintf(stderr,"failed to load config file %s\n", config_file);
exit_cleanup(RERR_SYNTAX);
}
log_open();
rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
FILE *f;
int pid = (int) getpid();
cleanup_set_pid(pid);
if ((f = fopen(lp_pid_file(), "w")) == NULL) {
cleanup_set_pid(0);
fprintf(stderr,"failed to create pid file %s\n", pid_file);
exit_cleanup(RERR_FILEIO);
}
fprintf(f, "%d\n", pid);
fclose(f);
}
start_accept_loop(rsync_port, start_daemon);
return -1;
}