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fdwatchd.c
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fdwatchd.c
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/*-
* Copyright (c) 2016 Christian S.J. Peron
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
#include "fdwatchd.h"
struct kevent *kev;
int nkev;
extern int yyparse(void);
extern FILE *yyin;
char *fflag;
int Fflag;
static void
stdfd_to_null(void)
{
int fd;
fd = open("/dev/null", O_RDWR);
if (fd == -1)
return;
(void) dup2(fd, STDIN_FILENO);
(void) dup2(fd, STDOUT_FILENO);
(void) dup2(fd, STDERR_FILENO);
setsid();
}
void
fdwatchd_load_config(char *conf)
{
FILE *fp;
fp = fopen(conf, "r");
if (fp == NULL) {
note(1, "could not load config: %s: %s\n",
conf, strerror(errno));
exit(1);
}
yyin = fp;
yyparse();
fclose(fp);
}
void
note(int level, char const *const fmt, ...)
{
va_list ap;
FILE *fp;
fp = stdout;
va_start(ap, fmt);
(void) fprintf(fp, "fdwatchd: %lu ", time(NULL));
vfprintf(fp, fmt, ap);
(void) fflush(fp);
}
int
fdwatchd_handle_event(struct kevent *kep, struct fdwatch *fp)
{
pid_t pid;
int status;
char *op;
int error;
if (kep->fflags & NOTE_WRITE)
op = "write";
if (kep->fflags & NOTE_DELETE)
op = "delete";
if (kep->fflags & NOTE_RENAME)
op = "rename";
if (kep->fflags & NOTE_ATTRIB)
op = "attrib";
note(1, "%s event on %s identified\n", op, fp->fdw_path);
pid = fork();
if (pid == -1) {
note(1, "failed to launch handler for %s\n",
fp->fdw_path);
return (-1);
}
if (pid == 0) {
(void) execl("/bin/sh", "sh",
fp->fdw_script,
fp->fdw_path,
op, NULL);
note(1, "failed to exec script\n");
_exit(1);
}
while (1) {
error = waitpid(pid, &status, 0);
if (error == -1 && errno == EINTR)
continue;
note(1, "collected exit status %d on pid %d\n", status, pid);
break;
}
return (0);
}
void
fdwatchd_evloop(void)
{
struct kevent *evlist, *kep;
struct fdwatch *fwp;
int error, k;
int kq;
evlist = calloc(nkev, sizeof(*evlist));
if (evlist == NULL) {
note(1, "failed to allocate kernel event array\n");
exit(1);
}
kq = kqueue();
if (kq == -1) {
note(1, "failed to create kernel event queue\n");
exit(1);
}
for (;;) {
error = kevent(kq, &kev[0], nkev, evlist, nkev, NULL);
if (error == -1) {
note(1, "kevent failed: %s\n", strerror(errno));
exit(1);
}
for (k = 0; k < error; k++) {
kep = &evlist[k];
fwp = (struct fdwatch *)kep->udata;
fdwatchd_handle_event(kep, fwp);
}
}
}
int
main(int argc, char *argv [])
{
int ch;
pid_t pid;
while ((ch = getopt(argc, argv, "Ff:")) != -1)
switch (ch) {
case 'F':
Fflag = 1;
break;
case 'f':
fflag = optarg;
break;
}
if (Fflag == 0) {
pid = fork();
if (pid == -1) {
note(1, "unable to daemonize: %s\n", strerror(errno));
exit(1);
}
if (pid != 0) {
(void) fprintf(stdout,
"launched into background: pid: %d\n", pid);
exit(1);
}
stdfd_to_null();
}
if (fflag == NULL)
fflag = DEF_CONF_PATH;
fdwatchd_load_config(fflag);
fdwatchd_evloop();
return (0);
}