"Fossies" - the Fresh Open Source Software archive 
Member "netatalk-3.0.3/etc/afpd/main.c" of archive netatalk-3.0.3.tar.gz:
/*
* Copyright (c) 1990,1993 Regents of The University of Michigan.
* All Rights Reserved. See COPYRIGHT.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <atalk/logger.h>
#include <atalk/adouble.h>
#include <atalk/compat.h>
#include <atalk/dsi.h>
#include <atalk/afp.h>
#include <atalk/paths.h>
#include <atalk/util.h>
#include <atalk/server_child.h>
#include <atalk/server_ipc.h>
#include <atalk/errchk.h>
#include <atalk/globals.h>
#include <atalk/netatalk_conf.h>
#include "afp_config.h"
#include "status.h"
#include "fork.h"
#include "uam_auth.h"
#include "afp_zeroconf.h"
#include "afpstats.h"
#define AFP_LISTENERS 32
#define FDSET_SAFETY 5
unsigned char nologin = 0;
static AFPObj obj;
static server_child_t *server_children;
static sig_atomic_t reloadconfig = 0;
static sig_atomic_t gotsigchld = 0;
/* Two pointers to dynamic allocated arrays which store pollfds and associated data */
static struct pollfd *fdset;
static struct polldata *polldata;
static int fdset_size; /* current allocated size */
static int fdset_used; /* number of used elements */
static afp_child_t *dsi_start(AFPObj *obj, DSI *dsi, server_child_t *server_children);
static void afp_exit(int ret)
{
exit(ret);
}
/* ------------------
initialize fd set we are waiting for.
*/
static void fd_set_listening_sockets(const AFPObj *config)
{
DSI *dsi;
for (dsi = config->dsi; dsi; dsi = dsi->next) {
fdset_add_fd(config->options.connections + AFP_LISTENERS + FDSET_SAFETY,
&fdset,
&polldata,
&fdset_used,
&fdset_size,
dsi->serversock,
LISTEN_FD,
dsi);
}
}
static void fd_reset_listening_sockets(const AFPObj *config)
{
const DSI *dsi;
for (dsi = config->dsi; dsi; dsi = dsi->next) {
fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, dsi->serversock);
}
}
/* ------------------ */
static void afp_goaway(int sig)
{
switch( sig ) {
case SIGTERM:
case SIGQUIT:
LOG(log_note, logtype_afpd, "AFP Server shutting down");
if (server_children)
server_child_kill(server_children, SIGTERM);
_exit(0);
break;
case SIGUSR1 :
nologin++;
auth_unload();
LOG(log_info, logtype_afpd, "disallowing logins");
if (server_children)
server_child_kill(server_children, sig);
break;
case SIGHUP :
/* w/ a configuration file, we can force a re-read if we want */
reloadconfig = 1;
break;
case SIGCHLD:
/* w/ a configuration file, we can force a re-read if we want */
gotsigchld = 1;
break;
default :
LOG(log_error, logtype_afpd, "afp_goaway: bad signal" );
}
return;
}
static void child_handler(void)
{
int fd;
int status, i;
pid_t pid;
#ifndef WAIT_ANY
#define WAIT_ANY (-1)
#endif /* ! WAIT_ANY */
while ((pid = waitpid(WAIT_ANY, &status, WNOHANG)) > 0) {
if ((fd = server_child_remove(server_children, pid)) != -1) {
fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, fd);
break;
}
if (WIFEXITED(status)) {
if (WEXITSTATUS(status))
LOG(log_info, logtype_afpd, "child[%d]: exited %d", pid, WEXITSTATUS(status));
else
LOG(log_info, logtype_afpd, "child[%d]: done", pid);
} else {
if (WIFSIGNALED(status))
LOG(log_info, logtype_afpd, "child[%d]: killed by signal %d", pid, WTERMSIG(status));
else
LOG(log_info, logtype_afpd, "child[%d]: died", pid);
}
}
}
static int setlimits(void)
{
struct rlimit rlim;
if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) {
LOG(log_warning, logtype_afpd, "setlimits: reading current limits failed: %s", strerror(errno));
return -1;
}
if (rlim.rlim_cur != RLIM_INFINITY && rlim.rlim_cur < 65535) {
rlim.rlim_cur = 65535;
if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_max < 65535)
rlim.rlim_max = 65535;
if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
LOG(log_warning, logtype_afpd, "setlimits: increasing limits failed: %s", strerror(errno));
return -1;
}
}
return 0;
}
int main(int ac, char **av)
{
struct sigaction sv;
sigset_t sigs;
int ret;
/* Parse argv args and initialize default options */
afp_options_parse_cmdline(&obj, ac, av);
if (!(obj.cmdlineflags & OPTION_DEBUG) && (daemonize(0, 0) != 0))
exit(EXITERR_SYS);
/* Log SIGBUS/SIGSEGV SBT */
fault_setup(NULL);
if (afp_config_parse(&obj, "afpd") != 0)
afp_exit(EXITERR_CONF);
/* Save the user's current umask */
obj.options.save_mask = umask(obj.options.umask);
/* install child handler for asp and dsi. we do this before afp_goaway
* as afp_goaway references stuff from here.
* XXX: this should really be setup after the initial connections. */
if (!(server_children = server_child_alloc(obj.options.connections))) {
LOG(log_error, logtype_afpd, "main: server_child alloc: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sigemptyset(&sigs);
pthread_sigmask(SIG_SETMASK, &sigs, NULL);
memset(&sv, 0, sizeof(sv));
/* linux at least up to 2.4.22 send a SIGXFZ for vfat fs,
even if the file is open with O_LARGEFILE ! */
#ifdef SIGXFSZ
sv.sa_handler = SIG_IGN;
sigemptyset( &sv.sa_mask );
if (sigaction(SIGXFSZ, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
#endif
sv.sa_handler = SIG_IGN;
sigemptyset( &sv.sa_mask );
if (sigaction(SIGPIPE, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sv.sa_handler = afp_goaway; /* handler for all sigs */
sigemptyset( &sv.sa_mask );
sigaddset(&sv.sa_mask, SIGALRM);
sigaddset(&sv.sa_mask, SIGHUP);
sigaddset(&sv.sa_mask, SIGTERM);
sigaddset(&sv.sa_mask, SIGUSR1);
sigaddset(&sv.sa_mask, SIGQUIT);
sv.sa_flags = SA_RESTART;
if ( sigaction( SIGCHLD, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sigemptyset( &sv.sa_mask );
sigaddset(&sv.sa_mask, SIGALRM);
sigaddset(&sv.sa_mask, SIGTERM);
sigaddset(&sv.sa_mask, SIGHUP);
sigaddset(&sv.sa_mask, SIGCHLD);
sigaddset(&sv.sa_mask, SIGQUIT);
sv.sa_flags = SA_RESTART;
if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sigemptyset( &sv.sa_mask );
sigaddset(&sv.sa_mask, SIGALRM);
sigaddset(&sv.sa_mask, SIGTERM);
sigaddset(&sv.sa_mask, SIGUSR1);
sigaddset(&sv.sa_mask, SIGCHLD);
sigaddset(&sv.sa_mask, SIGQUIT);
sv.sa_flags = SA_RESTART;
if ( sigaction( SIGHUP, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sigemptyset( &sv.sa_mask );
sigaddset(&sv.sa_mask, SIGALRM);
sigaddset(&sv.sa_mask, SIGHUP);
sigaddset(&sv.sa_mask, SIGUSR1);
sigaddset(&sv.sa_mask, SIGCHLD);
sigaddset(&sv.sa_mask, SIGQUIT);
sv.sa_flags = SA_RESTART;
if ( sigaction( SIGTERM, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
sigemptyset( &sv.sa_mask );
sigaddset(&sv.sa_mask, SIGALRM);
sigaddset(&sv.sa_mask, SIGHUP);
sigaddset(&sv.sa_mask, SIGUSR1);
sigaddset(&sv.sa_mask, SIGCHLD);
sigaddset(&sv.sa_mask, SIGTERM);
sv.sa_flags = SA_RESTART;
if (sigaction(SIGQUIT, &sv, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
afp_exit(EXITERR_SYS);
}
/* afp.conf: not in config file: lockfile, configfile
* preference: command-line provides defaults.
* config file over-writes defaults.
*
* we also need to make sure that killing afpd during startup
* won't leave any lingering registered names around.
*/
sigemptyset(&sigs);
sigaddset(&sigs, SIGALRM);
sigaddset(&sigs, SIGHUP);
sigaddset(&sigs, SIGUSR1);
#if 0
/* don't block SIGTERM */
sigaddset(&sigs, SIGTERM);
#endif
sigaddset(&sigs, SIGCHLD);
pthread_sigmask(SIG_BLOCK, &sigs, NULL);
#ifdef HAVE_DBUS_GLIB
/* Run dbus AFP statics thread */
if (obj.options.flags & OPTION_DBUS_AFPSTATS)
(void)afpstats_init(server_children);
#endif
if (configinit(&obj) != 0) {
LOG(log_error, logtype_afpd, "main: no servers configured");
afp_exit(EXITERR_CONF);
}
pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
/* Initialize */
cnid_init();
/* watch atp, dsi sockets and ipc parent/child file descriptor. */
fd_set_listening_sockets(&obj);
/* set limits */
(void)setlimits();
afp_child_t *child;
int recon_ipc_fd;
pid_t pid;
int saveerrno;
/* wait for an appleshare connection. parent remains in the loop
* while the children get handled by afp_over_{asp,dsi}. this is
* currently vulnerable to a denial-of-service attack if a
* connection is made without an actual login attempt being made
* afterwards. establishing timeouts for logins is a possible
* solution. */
while (1) {
LOG(log_maxdebug, logtype_afpd, "main: polling %i fds", fdset_used);
pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
ret = poll(fdset, fdset_used, -1);
pthread_sigmask(SIG_BLOCK, &sigs, NULL);
saveerrno = errno;
if (gotsigchld) {
gotsigchld = 0;
child_handler();
continue;
}
if (reloadconfig) {
nologin++;
fd_reset_listening_sockets(&obj);
LOG(log_info, logtype_afpd, "re-reading configuration file");
configfree(&obj, NULL);
afp_config_free(&obj);
if (afp_config_parse(&obj, "afpd") != 0)
afp_exit(EXITERR_CONF);
if (configinit(&obj) != 0) {
LOG(log_error, logtype_afpd, "config re-read: no servers configured");
afp_exit(EXITERR_CONF);
}
fd_set_listening_sockets(&obj);
nologin = 0;
reloadconfig = 0;
errno = saveerrno;
continue;
}
if (ret == 0)
continue;
if (ret < 0) {
if (errno == EINTR)
continue;
LOG(log_error, logtype_afpd, "main: can't wait for input: %s", strerror(errno));
break;
}
for (int i = 0; i < fdset_used; i++) {
if (fdset[i].revents & (POLLIN | POLLERR | POLLHUP | POLLNVAL)) {
switch (polldata[i].fdtype) {
case LISTEN_FD:
if ((child = dsi_start(&obj, (DSI *)polldata[i].data, server_children))) {
/* Add IPC fd to select fd set */
fdset_add_fd(obj.options.connections + AFP_LISTENERS + FDSET_SAFETY,
&fdset,
&polldata,
&fdset_used,
&fdset_size,
child->afpch_ipc_fd,
IPC_FD,
child);
}
break;
case IPC_FD:
child = (afp_child_t *)polldata[i].data;
LOG(log_debug, logtype_afpd, "main: IPC request from child[%u]", child->afpch_pid);
if (ipc_server_read(server_children, child->afpch_ipc_fd) != 0) {
fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, child->afpch_ipc_fd);
close(child->afpch_ipc_fd);
child->afpch_ipc_fd = -1;
}
break;
default:
LOG(log_debug, logtype_afpd, "main: IPC request for unknown type");
break;
} /* switch */
} /* if */
} /* for (i)*/
} /* while (1) */
return 0;
}
static afp_child_t *dsi_start(AFPObj *obj, DSI *dsi, server_child_t *server_children)
{
afp_child_t *child = NULL;
if (dsi_getsession(dsi, server_children, obj->options.tickleval, &child) != 0) {
LOG(log_error, logtype_afpd, "dsi_start: session error: %s", strerror(errno));
return NULL;
}
/* we've forked. */
if (child == NULL) {
configfree(obj, dsi);
afp_over_dsi(obj); /* start a session */
exit (0);
}
return child;
}