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548 lines
10 KiB
C
548 lines
10 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $Id: scspd.c,v 1.1 1998/09/15 08:23:17 phk Exp $
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*
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*/
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/*
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* Server Cache Synchronization Protocol (SCSP) Support
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* ----------------------------------------------------
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*
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* SCSP server daemon main line code
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*
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/ttycom.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netatm/queue.h>
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#include <netatm/atm.h>
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#include <netatm/atm_if.h>
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#include <netatm/atm_sap.h>
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#include <netatm/atm_sys.h>
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#include <netatm/atm_ioctl.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libatm.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "scsp_msg.h"
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#include "scsp_if.h"
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#include "scsp_var.h"
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#ifndef lint
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__RCSID("@(#) $Id: scspd.c,v 1.1 1998/09/15 08:23:17 phk Exp $");
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#endif
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/*
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* Global variables
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*/
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char *prog;
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char *scsp_config_file = SCSPD_CONFIG;
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FILE *scsp_log_file = (FILE *)0;
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int scsp_log_syslog = 0;
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Scsp_server *scsp_server_head = (Scsp_server *)0;
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Scsp_pending *scsp_pending_head = (Scsp_pending *)0;
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int scsp_max_socket = -1;
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int scsp_debug_mode = 0;
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int scsp_trace_mode = 0;
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/*
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* Local variables
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*/
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static int scsp_hup_signal = 0;
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static int scsp_int_signal = 0;
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/*
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* SIGHUP signal handler
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*
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* Arguments:
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* sig signal number
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*
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* Returns:
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* none
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*
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*/
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void
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scsp_sighup(sig)
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int sig;
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{
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/*
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* Flag the signal
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*/
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scsp_hup_signal = 1;
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}
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/*
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* SIGINT signal handler
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*
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* Arguments:
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* sig signal number
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*
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* Returns:
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* none
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*
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*/
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void
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scsp_sigint(sig)
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int sig;
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{
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/*
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* Flag the signal
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*/
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scsp_int_signal = 1;
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}
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/*
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* Process command line parameters
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*
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* Arguments:
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* argc number of command-line arguments
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* argv list of pointers to command-line arguments
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*
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* Returns:
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* none
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*
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*/
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void
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initialize(argc, argv)
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int argc;
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char **argv;
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{
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int i;
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char *cp;
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/*
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* Save program name, ignoring any path components
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*/
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if ((prog = (char *)strrchr(argv[0], '/')) != NULL)
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prog++;
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else
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prog = argv[0];
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/*
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* Make sure we're being invoked by the super user
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*/
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i = getuid();
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if (i != 0) {
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fprintf(stderr, "%s: You must be root to run this program\n",
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prog);
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exit(1);
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}
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/*
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* Check for command-line options
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*/
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-d") == 0) {
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/*
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* -d option -- set debug mode
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*/
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scsp_debug_mode = 1;
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} else if (strcmp(argv[i], "-f") == 0) {
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/*
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* -f option -- set config file name
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*/
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i++;
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if (i >= argc) {
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fprintf(stderr, "%s: Configuration file name missing\n",
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prog);
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exit(1);
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}
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scsp_config_file = argv[i];
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} else if (strncmp(argv[i], "-T", 2) == 0) {
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/*
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* -T option -- trace options
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*/
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for (cp = &argv[i][2]; *cp; cp++) {
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if (*cp == 'c')
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scsp_trace_mode |= SCSP_TRACE_CAFSM;
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else if (*cp == 'h')
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scsp_trace_mode |= SCSP_TRACE_HFSM;
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else if (*cp == 'i')
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scsp_trace_mode |= SCSP_TRACE_CFSM;
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else if (*cp == 'C')
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scsp_trace_mode |= SCSP_TRACE_CA_MSG;
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else if (*cp == 'H')
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scsp_trace_mode |= SCSP_TRACE_HELLO_MSG;
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else if (*cp == 'I')
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scsp_trace_mode |= SCSP_TRACE_IF_MSG;
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else
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fprintf(stderr, "Invalid trace specification '%c' ignored\n",
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*cp);
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}
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} else {
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/*
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* Error -- unrecognized option
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*/
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fprintf(stderr, "%s: Unrecognized option \"%s\"\n",
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prog, argv[i]);
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exit(1);
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}
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}
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}
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/*
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* Daemon housekeeping
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*
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* Arguments:
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* None
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*
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* Returns:
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* None
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*
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*/
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static void
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start_daemon()
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{
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int dpid, fd, file_count, rc;
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/*
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* Ignore selected signals
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*/
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#ifdef SIGTTOU
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signal(SIGTTOU, SIG_IGN);
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#endif
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#ifdef SIGTTIN
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signal(SIGTTIN, SIG_IGN);
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#endif
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#ifdef SIGTSTP
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signal(SIGTSTP, SIG_IGN);
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#endif
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#ifdef SIGPIPE
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signal(SIGPIPE, SIG_IGN);
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#endif
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/*
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* Don't put the daemon into the background if
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* we're in debug mode
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*/
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if (scsp_debug_mode)
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goto daemon_bypass;
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/*
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* Put the daemon into the background
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*/
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dpid = fork();
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if (dpid < 0) {
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scsp_log(LOG_ERR, "fork failed");
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abort();
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}
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if (dpid > 0) {
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/*
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* This is the parent process--just exit and let
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* the daughter do all the work
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*/
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exit(0);
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}
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/*
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* Disassociate from any controlling terminal
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*/
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rc = setpgrp(0, getpid());
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if (rc <0) {
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scsp_log(LOG_ERR, "can't change process group");
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exit(1);
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}
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fd = open("/dev/tty", O_RDWR);
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if (fd >= 0) {
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ioctl(fd, TIOCNOTTY, (char *)0);
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close(fd);
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}
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/*
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* Close all open file descriptors
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*/
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file_count = getdtablesize();
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for (fd=0; fd<file_count; fd++) {
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close(fd);
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}
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/*
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* Set up timers
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*/
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daemon_bypass:
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init_timer();
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/*
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* Move to a safe directory
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*/
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chdir(SCSPD_DIR);
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/*
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* Clear the file mode creation mask
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*/
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umask(0);
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/*
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* Set up signal handlers
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*/
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rc = (int)signal(SIGHUP, scsp_sighup);
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if (rc == -1) {
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scsp_log(LOG_ERR, "SIGHUP signal setup failed");
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exit(1);
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}
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rc = (int)signal(SIGINT, scsp_sigint);
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if (rc == -1) {
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scsp_log(LOG_ERR, "SIGINT signal setup failed");
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exit(1);
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}
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/*
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* Set up syslog for error logging
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*/
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if (scsp_log_syslog || !scsp_log_file) {
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openlog(prog, LOG_PID | LOG_CONS, LOG_DAEMON);
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}
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scsp_log(LOG_INFO, "Starting SCSP daemon");
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}
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/*
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* Main line code
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*
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* Process command line parameters, read configuration file, connect
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* to configured clients, process data from DCSs.
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*
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* Arguments:
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* argc number of command-line arguments
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* argv list of pointers to command-line arguments
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*
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* Returns:
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* none
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*
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*/
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int i, rc, scsp_server_lsock;
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Scsp_server *ssp;
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Scsp_dcs *dcsp;
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Scsp_pending *next_psp, *psp;
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fd_set read_set, write_set, except_set;
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/*
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* Process command line arguments
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*/
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initialize(argc, argv);
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/*
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* Put the daemon into the background
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*/
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start_daemon();
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/*
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* Process configuration file
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*/
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rc = scsp_config(scsp_config_file);
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if (rc) {
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scsp_log(LOG_ERR, "Found %d error%s in configuration file",
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rc, ((rc == 1) ? "" : "s"));
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exit(1);
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}
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/*
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* Open the trace file if we need one
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*/
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if (scsp_trace_mode) {
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scsp_open_trace();
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}
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/*
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* Listen for connections from clients
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*/
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scsp_server_lsock = scsp_server_listen();
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if (scsp_server_lsock == -1) {
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scsp_log(LOG_ERR, "server listen failed");
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abort();
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}
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/*
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* Main program loop -- we wait for:
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* a server listen to complete
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* a DCS listen to complete
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* a DCS connect to complete
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* data from a server
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* data from a DCS
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*/
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while (1) {
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/*
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* Set up the file descriptor sets and select to wait
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* for input
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*/
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FD_ZERO(&read_set);
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FD_ZERO(&write_set);
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FD_ZERO(&except_set);
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FD_SET(scsp_server_lsock, &read_set);
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for (ssp = scsp_server_head; ssp; ssp = ssp->ss_next) {
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if (ssp->ss_dcs_lsock != -1)
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FD_SET(ssp->ss_dcs_lsock, &read_set);
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if (ssp->ss_sock != -1)
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FD_SET(ssp->ss_sock, &read_set);
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for (dcsp = ssp->ss_dcs; dcsp;
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dcsp = dcsp->sd_next) {
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if (dcsp->sd_sock != -1) {
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if (dcsp->sd_hello_state ==
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SCSP_HFSM_DOWN )
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FD_SET(dcsp->sd_sock,
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&write_set);
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else
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FD_SET(dcsp->sd_sock,
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&read_set);
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}
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}
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}
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for (psp = scsp_pending_head; psp; psp = psp->sp_next) {
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FD_SET(psp->sp_sock, &read_set);
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}
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rc = select(scsp_max_socket + 1, &read_set,
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&write_set, &except_set,
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(struct timeval *)0);
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if (rc < 0) {
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/*
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* Select error--check for possible signals
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*/
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if (harp_timer_exec) {
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/*
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* Timer tick--process it
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*/
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timer_proc();
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continue;
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} else if (scsp_hup_signal) {
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/*
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* SIGHUP signal--reconfigure
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*/
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scsp_hup_signal = 0;
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scsp_reconfigure();
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continue;
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} else if (scsp_int_signal) {
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/*
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* SIGINT signal--dump control blocks
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*/
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print_scsp_dump();
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scsp_int_signal = 0;
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continue;
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} else if (errno == EINTR) {
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/*
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* EINTR--just ignore it
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*/
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continue;
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} else {
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/*
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* Other error--this is a problem
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*/
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scsp_log(LOG_ERR, "Select failed");
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abort();
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}
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}
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/*
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* Check the read set for connections from servers
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*/
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if (FD_ISSET(scsp_server_lsock, &read_set)) {
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FD_CLR(scsp_server_lsock, &read_set);
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rc = scsp_server_accept(scsp_server_lsock);
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}
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/*
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* Check the write set for new connections to DCSs
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*/
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for (i = 0; i <= scsp_max_socket; i++) {
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if (FD_ISSET(i, &write_set)) {
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FD_CLR(i, &write_set);
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if ((dcsp = scsp_find_dcs(i)) != NULL) {
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rc = scsp_hfsm(dcsp,
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SCSP_HFSM_VC_ESTAB,
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(Scsp_msg *)0);
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}
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}
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}
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/*
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* Check the read set for connections from DCSs
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*/
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for (ssp = scsp_server_head; ssp; ssp = ssp->ss_next) {
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if (ssp->ss_dcs_lsock != -1 &&
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FD_ISSET(ssp->ss_dcs_lsock,
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&read_set)) {
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FD_CLR(ssp->ss_dcs_lsock, &read_set);
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dcsp = scsp_dcs_accept(ssp);
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if (dcsp) {
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rc = scsp_hfsm(dcsp,
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SCSP_HFSM_VC_ESTAB,
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(Scsp_msg *)0);
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}
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}
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}
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/*
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* Check the read set for data from pending servers
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*/
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for (psp = scsp_pending_head; psp; psp = next_psp) {
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next_psp = psp->sp_next;
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if (FD_ISSET(psp->sp_sock, &read_set)) {
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FD_CLR(psp->sp_sock, &read_set);
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rc = scsp_pending_read(psp);
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}
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}
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/*
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* Check the read set for data from servers or DCSs
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*/
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for (i = 0; i <= scsp_max_socket; i++) {
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if (FD_ISSET(i, &read_set)) {
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if ((ssp = scsp_find_server(i)) != NULL) {
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rc = scsp_server_read(ssp);
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} else if ((dcsp = scsp_find_dcs(i)) != NULL) {
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rc = scsp_dcs_read(dcsp);
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}
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}
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}
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}
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}
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