406 lines
10 KiB
C
406 lines
10 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1995 Eugene W. Stark
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Eugene W. Stark.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY EUGENE W. STARK (THE AUTHOR) ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* xtend - X-10 daemon
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* Eugene W. Stark (stark@cs.sunysb.edu)
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* January 14, 1993
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*/
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#include <err.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <grp.h>
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#include "xtend.h"
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#include "xten.h"
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#include "paths.h"
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FILE *Log; /* Log file */
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FILE *User; /* User connection */
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STATUS Status[16][16]; /* Device status table */
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int status; /* Status file descriptor */
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int tw523; /* tw523 controller */
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int sock; /* socket for user */
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jmp_buf mainloop; /* longjmp point after SIGHUP */
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volatile sig_atomic_t hup_flag; /* received SIGHUP flag */
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volatile sig_atomic_t term_flag; /* received SIGTERM flag */
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volatile sig_atomic_t pipe_flag; /* received SIGPIPE flag */
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void checkpoint_status __P((void));
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void dohup __P((void));
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void dopipe __P((void));
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void doterm __P((void));
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void initstatus __P((void));
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void logpacket __P((unsigned char *));
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void onhup __P((void));
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void onpipe __P((void));
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void onterm __P((void));
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void processpacket __P((unsigned char *));
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int user_command __P((void));
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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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const char *twpath = TWPATH;
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const char *sockpath = SOCKPATH;
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char logpath[MAXPATHLEN+1];
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char statpath[MAXPATHLEN+1];
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struct sockaddr_un sa;
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struct timeval tv;
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struct passwd *pw;
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struct group *gr;
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struct stat sb;
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int user;
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FILE *pidf;
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/*
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* Make sure we start out running as root
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*/
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if(geteuid() != 0)
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errx(1, "you must be root");
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/*
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* Find out what UID/GID we are to run as
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*/
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if((pw = getpwnam(XTENUNAME)) == NULL)
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errx(1, "no such user '%s'", XTENUNAME);
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if((gr = getgrnam(XTENGNAME)) == NULL)
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errx(1, "no such group '%s'", XTENGNAME);
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/*
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* Open the log file before doing anything else
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*/
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strcpy(logpath, X10DIR);
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if(stat(logpath, &sb) == -1 && errno == ENOENT) {
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if(mkdir(logpath, 0755) != -1) {
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chown(logpath, pw->pw_uid, gr->gr_gid);
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} else {
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errx(1, "can't create directory '%s'", logpath);
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}
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}
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strcat(logpath, "/");
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strcat(logpath, X10LOGNAME);
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if((Log = fopen(logpath, "a")) == NULL)
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errx(1, "can't open log file '%s'", logpath);
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chown(logpath, pw->pw_uid, gr->gr_gid);
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/*
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* Become a daemon
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*/
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if(daemon(0, 0) == -1) {
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fprintf(Log, "%s: Unable to become a daemon\n", thedate());
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fclose(Log);
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exit(1);
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}
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fprintf(Log, "%s: %s [%d] started\n", thedate(), argv[0], getpid());
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/*
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* Get ahold of the TW523 device
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*/
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if((tw523 = open(twpath, O_RDWR)) < 0) {
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fprintf(Log, "%s: Can't open %s\n", thedate(), twpath);
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fclose(Log);
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exit(1);
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}
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fprintf(Log, "%s: %s successfully opened\n", thedate(), twpath);
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/*
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* Put our pid in a file so we can be signalled by shell scripts
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*/
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if((pidf = fopen(PIDPATH, "w")) == NULL) {
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fprintf(Log, "%s: Error writing pid file: %s\n", thedate(), PIDPATH);
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fclose(Log);
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exit(1);
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}
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fprintf(pidf, "%d\n", getpid());
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fclose(pidf);
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/*
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* Set up socket to accept user commands
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*/
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if((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
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fprintf(Log, "%s: Can't create socket\n", thedate());
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fclose(Log);
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exit(1);
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}
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strcpy(sa.sun_path, sockpath);
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sa.sun_family = AF_UNIX;
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unlink(sockpath);
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if(bind(sock, (struct sockaddr *)(&sa), strlen(sa.sun_path) + 2) < 0) {
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fprintf(Log, "%s: Can't bind socket to %s\n", thedate(), sockpath);
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fclose(Log);
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exit(1);
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}
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if(listen(sock, 5) < 0) {
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fprintf(Log, "%s: Can't listen on socket\n", thedate());
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fclose(Log);
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exit(1);
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}
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/*
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* Set proper ownership and permissions on the socket
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*/
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if(chown(sockpath, pw->pw_uid, gr->gr_gid) == -1 ||
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chmod(sockpath, 0660) == -1) {
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fprintf(Log, "%s: Can't set owner/permissions on socket\n", thedate());
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fclose(Log);
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exit(1);
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}
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/*
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* Give up root privileges
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*/
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setgid(pw->pw_gid);
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setuid(pw->pw_uid);
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/*
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* Initialize the status table
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*/
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strcpy(statpath, X10DIR);
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strcat(statpath, "/");
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strcat(statpath, X10STATNAME);
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if((status = open(statpath, O_RDWR)) < 0) {
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if((status = open(statpath, O_RDWR | O_CREAT, 0666)) < 0) {
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fprintf(Log, "%s: Can't open %s\n", thedate(), statpath);
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fclose(Log);
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exit(1);
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}
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if(write(status, Status, 16 * 16 * sizeof(STATUS))
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!= 16 * 16 * sizeof(STATUS)) {
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fprintf(Log, "%s: Error initializing status file\n", thedate());
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fclose(Log);
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exit(1);
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}
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}
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initstatus();
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/*
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* Return here on SIGHUP after closing and reopening log file.
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* Also on SIGPIPE after closing user connection.
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*/
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term_flag = 0;
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hup_flag = 0;
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pipe_flag = 0;
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signal(SIGTERM, (sig_t)onterm);
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signal(SIGHUP, (sig_t)onhup);
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signal(SIGPIPE, (sig_t)onpipe);
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setjmp(mainloop);
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/*
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* Now start the main processing loop.
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*/
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tv.tv_sec = 0;
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tv.tv_usec = 250000;
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while(1) {
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fd_set fs;
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unsigned char rpkt[3];
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int sel, h, k;
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STATUS *s;
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if (hup_flag)
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dohup();
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if (term_flag)
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doterm();
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if (pipe_flag)
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dopipe();
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FD_ZERO(&fs);
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FD_SET(tw523, &fs);
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if(User != NULL) FD_SET(user, &fs);
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else FD_SET(sock, &fs);
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sel = select(FD_SETSIZE, &fs, 0, 0, &tv);
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if(sel == 0) {
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/*
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* Cancel brightening and dimming on ALL units on ALL house codes,
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* because the fact that we haven't gotten a packet for awhile means
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* that there was a gap in transmission.
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*/
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for(h = 0; h < 16; h++) {
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for(k = 0; k < 16; k++) {
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s = &Status[h][k];
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if(s->selected == BRIGHTENING || s->selected == DIMMING) {
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s->selected = IDLE;
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s->lastchange = time(NULL);
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s->changed = 1;
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}
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}
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}
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fflush(Log);
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checkpoint_status();
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/*
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* Now that we've done this stuff, we'll set the timeout a little
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* longer, so we don't keep looping too frequently.
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*/
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tv.tv_sec = 60;
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tv.tv_usec = 0;
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continue;
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}
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/*
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* While there is stuff happening, we keep a short timeout, so we
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* don't get stuck for some unknown reason, and so we can keep the
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* brightening and dimming data up-to-date.
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*/
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tv.tv_sec = 0;
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tv.tv_usec = 250000;
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if(FD_ISSET(tw523, &fs)) { /* X10 data arriving from TW523 */
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if(read(tw523, rpkt, 3) < 3) {
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fprintf(Log, "%s: Error reading from TW523\n", thedate());
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} else {
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logpacket(rpkt);
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processpacket(rpkt);
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}
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} else if(FD_ISSET(user, &fs) && User != NULL) {
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if(user_command()) {
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fprintf(Log, "%s: Closing user connection\n", thedate());
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fclose(User);
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User = NULL;
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}
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} else if(FD_ISSET(sock, &fs)) { /* Accept a connection */
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if (User == NULL) {
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int len = sizeof(struct sockaddr_un);
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if((user = accept(sock, (struct sockaddr *)(&sa), &len)) >= 0) {
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fprintf(Log, "%s: Accepting user connection\n", thedate());
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if((User = fdopen(user, "w+")) == NULL) {
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fprintf(Log, "%s: Can't attach socket to stream\n", thedate());
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}
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} else {
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fprintf(Log, "%s: Failure in attempt to accept connection\n", thedate());
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}
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} else {
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/* "Can't happen */
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}
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}
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}
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/* Not reached */
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}
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char *thedate(void)
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{
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char *cp, *cp1;
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time_t tod;
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tod = time(NULL);
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cp = cp1 = ctime(&tod);
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while(*cp1 != '\n') cp1++;
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*cp1 = '\0';
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return(cp);
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}
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void onhup(void)
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{
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hup_flag = 1;
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}
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void onterm(void)
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{
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term_flag = 1;
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}
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void onpipe(void)
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{
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pipe_flag = 1;
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}
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/*
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* When SIGHUP received, close and reopen the Log file
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*/
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void dohup(void)
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{
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char logpath[MAXPATHLEN+1];
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fprintf(Log, "%s: SIGHUP received, reopening Log\n", thedate());
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fclose(Log);
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strcpy(logpath, X10DIR);
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strcat(logpath, "/");
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strcat(logpath, X10LOGNAME);
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if((Log = fopen(logpath, "a")) == NULL)
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errx(1, "can't open log file '%s'", logpath);
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hup_flag = 0;
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longjmp(mainloop, 1);
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/* No return */
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}
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/*
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* When SIGTERM received, just exit normally
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*/
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void doterm(void)
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{
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fprintf(Log, "%s: SIGTERM received, shutting down\n", thedate());
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fclose(Log);
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term_flag = 0;
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exit(0);
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}
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/*
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* When SIGPIPE received, reset user connection
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*/
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void dopipe(void)
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{
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fprintf(Log, "%s: SIGPIPE received, resetting user connection\n",
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thedate());
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if(User != NULL) {
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fclose(User);
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User = NULL;
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}
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pipe_flag = 0;
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longjmp(mainloop, 1);
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/* No return */
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}
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