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freebsd/libexec/xtend/xtend.c

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