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/*-
* Copyright (c) 2002 M. Warner Losh.
* 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.
*/
/*
* DEVD control daemon.
*/
// TODO list:
// o rewrite the main loop:
// - expand variables
// - find best match
// - execute it.
// o need to insert the event_proc structures in order of priority.
// bigger numbers mean higher priority.
// o devd.conf and devd man pages need a lot of help:
// - devd.conf needs to lose the warning about zone files.
// - devd.conf needs more details on the supported statements.
// - devd.conf needs an example or two.
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <map>
#include <string>
#include <vector>
#include "devd.h"
#define CF "/etc/devd.conf"
using namespace std;
extern FILE *yyin;
extern int lineno;
int dflag;
int romeo_must_die = 0;
static void event_loop(void);
static void usage(void);
class config;
class var_list
{
public:
var_list() {}
virtual ~var_list() {}
void set_variable(const string &var, const string &val);
const string &get_variable(const string &var) const;
bool is_set(const string &var) const;
static const string bogus;
static const string nothing;
private:
map<string, string> _vars;
};
class eps
{
public:
eps() {}
virtual ~eps() {}
virtual bool do_match(config &) = 0;
virtual bool do_action(config &) = 0;
};
class match : public eps
{
public:
match(const char *var, const char *re);
virtual ~match();
virtual bool do_match(config &);
virtual bool do_action(config &) { return true; }
private:
string _var;
string _re;
};
class action : public eps
{
public:
action(const char *cmd);
virtual ~action();
virtual bool do_match(config &) { return true; }
virtual bool do_action(config &);
private:
string _cmd;
};
class event_proc
{
public:
event_proc();
virtual ~event_proc();
int get_priority() { return (_prio); }
void set_priority(int prio) { _prio = prio; }
void add(eps *);
bool matches(config &);
bool run(config &);
private:
int _prio;
vector<eps *> _epsvec;
};
class config
{
public:
config() : _pidfile("") { push_var_table(); }
virtual ~config() { reset(); }
void add_attach(int, event_proc *);
void add_detach(int, event_proc *);
void add_directory(const char *);
void add_nomatch(int, event_proc *);
void set_pidfile(const char *);
void reset();
void parse();
void drop_pidfile();
void push_var_table();
void pop_var_table();
void set_variable(const char *var, const char *val);
const string &get_variable(const string &var);
const string &expand_string(const string &var);
protected:
void parse_one_file(const char *fn);
void parse_files_in_dir(const char *dirname);
private:
vector<string> _dir_list;
string _pidfile;
vector<var_list *> _var_list_table;
vector<event_proc *> _attach_list;
vector<event_proc *> _detach_list;
vector<event_proc *> _nomatch_list;
};
config cfg;
event_proc::event_proc() : _prio(-1)
{
// nothing
}
event_proc::~event_proc()
{
vector<eps *>::const_iterator i;
for (i = _epsvec.begin(); i != _epsvec.end(); i++)
delete *i;
_epsvec.clear();
}
void
event_proc::add(eps *eps)
{
_epsvec.push_back(eps);
}
bool
event_proc::matches(config &c)
{
vector<eps *>::const_iterator i;
for (i = _epsvec.begin(); i != _epsvec.end(); i++)
if (!(*i)->do_match(c))
return (false);
return (true);
}
bool
event_proc::run(config &c)
{
vector<eps *>::const_iterator i;
for (i = _epsvec.begin(); i != _epsvec.end(); i++)
if (!(*i)->do_action(c))
return (false);
return (true);
}
action::action(const char *cmd)
: _cmd(cmd)
{
// nothing
}
action::~action()
{
// nothing
}
bool
action::do_action(config &)
{
// this is lame because we don't expand variables.
// xxx
::system(_cmd.c_str());
return (true);
}
match::match(const char *var, const char *re)
: _var(var), _re(re)
{
// nothing
}
match::~match()
{
// nothing
}
bool
match::do_match(config &)
{
// XXX
return false;
}
const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
const string var_list::nothing = "";
const string &
var_list::get_variable(const string &var) const
{
map<string, string>::const_iterator i;
i = _vars.find(var);
if (i == _vars.end())
return var_list::bogus;
return (i->second);
}
bool
var_list::is_set(const string &var) const
{
return (_vars.find(var) != _vars.end());
}
void
var_list::set_variable(const string &var, const string &val)
{
_vars[var] = val;
}
void
config::reset(void)
{
_dir_list.clear();
_var_list_table.clear();
// XXX need to cleanup _{attach,detach,nomatch}_list
}
void
config::parse_one_file(const char *fn)
{
if (dflag)
printf("Parsing %s\n", fn);
yyin = fopen(fn, "r");
if (yyin == NULL)
err(1, "Cannot open config file %s", fn);
if (yyparse() != 0)
errx(1, "Cannot parse %s at line %d", fn, lineno);
fclose(yyin);
}
void
config::parse_files_in_dir(const char *dirname)
{
DIR *dirp;
struct dirent *dp;
char path[PATH_MAX];
if (dflag)
printf("Parsing files in %s\n", dirname);
dirp = opendir(dirname);
if (dirp == NULL)
return;
readdir(dirp); /* Skip . */
readdir(dirp); /* Skip .. */
while ((dp = readdir(dirp)) != NULL) {
if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
snprintf(path, sizeof(path), "%s/%s",
dirname, dp->d_name);
parse_one_file(path);
}
}
}
void
config::parse(void)
{
vector<string>::const_iterator i;
parse_one_file(CF);
for (i = _dir_list.begin(); i != _dir_list.end(); i++)
parse_files_in_dir((*i).c_str());
}
void
config::drop_pidfile()
{
FILE *fp;
if (_pidfile == "")
return;
fp = fopen(_pidfile.c_str(), "w");
if (fp == NULL)
return;
fprintf(fp, "%d\n", getpid());
fclose(fp);
}
void
config::add_attach(int prio, event_proc *p)
{
p->set_priority(prio);
_attach_list.push_back(p);
}
void
config::add_detach(int prio, event_proc *p)
{
p->set_priority(prio);
_detach_list.push_back(p);
}
void
config::add_directory(const char *dir)
{
_dir_list.push_back(string(dir));
}
void
config::add_nomatch(int prio, event_proc *p)
{
p->set_priority(prio);
_nomatch_list.push_back(p);
}
void
config::set_pidfile(const char *fn)
{
_pidfile = string(fn);
}
void
config::push_var_table()
{
var_list *vl;
vl = new var_list();
_var_list_table.push_back(vl);
}
void
config::pop_var_table()
{
delete _var_list_table.back();
_var_list_table.pop_back();
}
void
config::set_variable(const char *var, const char *val)
{
_var_list_table.back()->set_variable(var, val);
}
const string &
config::get_variable(const string &var)
{
vector<var_list *>::reverse_iterator i;
for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
if ((*i)->is_set(var))
return (var);
}
return (var_list::nothing);
}
const string &
config::expand_string(const string &)
{
return var_list::bogus;
}
static void
process_event(const char *buffer)
{
char type;
char cmd[1024];
char *sp;
// XXX should involve config
// XXX and set some variables
// XXX run the list and so forth
// Ignore unknown devices for now.
if (*buffer == '?')
return;
type = *buffer++;
sp = strchr(buffer, ' ');
if (sp == NULL)
return; /* Can't happen? */
*sp = '\0';
snprintf(cmd, sizeof(cmd), "/etc/devd-generic %s %s", buffer,
type == '+' ? "start" : "stop");
if (dflag)
printf("Trying '%s'\n", cmd);
system(cmd);
}
static void
event_loop(void)
{
int rv;
int fd;
char buffer[DEVCTL_MAXBUF];
fd = open(PATH_DEVCTL, O_RDONLY);
if (fd == -1)
err(1, "Can't open devctl");
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
err(1, "Can't set close-on-exec flag");
while (1) {
if (romeo_must_die)
break;
rv = read(fd, buffer, sizeof(buffer) - 1);
if (rv > 0) {
buffer[rv] = '\0';
while (buffer[--rv] == '\n')
buffer[rv] = '\0';
process_event(buffer);
} else if (rv < 0) {
if (errno != EINTR)
break;
} else {
/* EOF */
break;
}
}
close(fd);
}
/*
* functions that the parser uses.
*/
void
add_attach(int prio, event_proc *p)
{
cfg.add_attach(prio, p);
}
void
add_detach(int prio, event_proc *p)
{
cfg.add_detach(prio, p);
}
void
add_directory(const char *dir)
{
cfg.add_directory(dir);
free(const_cast<char *>(dir));
}
void
add_nomatch(int prio, event_proc *p)
{
cfg.add_nomatch(prio, p);
}
event_proc *
add_to_event_proc(event_proc *ep, eps *eps)
{
if (ep == NULL)
ep = new event_proc();
ep->add(eps);
return (ep);
}
eps *
new_action(const char *cmd)
{
eps *e = new action(cmd);
free(const_cast<char *>(cmd));
return (e);
}
eps *
new_match(const char *var, const char *re)
{
eps *e = new match(var, re);
free(const_cast<char *>(var));
free(const_cast<char *>(re));
return (e);
}
void
set_pidfile(const char *name)
{
cfg.set_pidfile(name);
free(const_cast<char *>(name));
}
void
set_variable(const char *var, const char *val)
{
cfg.set_variable(var, val);
free(const_cast<char *>(var));
free(const_cast<char *>(val));
}
static void
gensighand(int)
{
romeo_must_die++;
_exit(0);
}
static void
usage()
{
fprintf(stderr, "usage: %s [-d]", getprogname());
exit(1);
}
/*
* main
*/
int
main(int argc, char **argv)
{
int ch;
while ((ch = getopt(argc, argv, "d")) != -1) {
switch (ch) {
case 'd':
dflag++;
break;
default:
usage();
}
}
cfg.parse();
if (!dflag)
daemon(0, 0);
cfg.drop_pidfile();
signal(SIGHUP, gensighand);
signal(SIGINT, gensighand);
signal(SIGTERM, gensighand);
event_loop();
return (0);
}
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