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854 lines
15 KiB
C++
854 lines
15 KiB
C++
/*-
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* Copyright (c) 2002-2003 M. Warner Losh.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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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/*
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* DEVD control daemon.
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*/
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// TODO list:
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// o devd.conf and devd man pages need a lot of help:
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// - devd needs to document the unix domain socket
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// - devd.conf needs more details on the supported statements.
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/sysctl.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <err.h>
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#include <fcntl.h>
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#include <regex.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <algorithm>
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#include <map>
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#include <string>
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#include <list>
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#include <vector>
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#include "devd.h" /* C compatible definitions */
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#include "devd.hh" /* C++ class definitions */
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#define PIPE "/var/run/devd.pipe"
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#define CF "/etc/devd.conf"
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#define SYSCTL "hw.bus.devctl_disable"
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using namespace std;
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extern FILE *yyin;
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extern int lineno;
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static const char notify = '!';
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static const char nomatch = '?';
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static const char attach = '+';
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static const char detach = '-';
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int Dflag;
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int dflag;
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int nflag;
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int romeo_must_die = 0;
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static void event_loop(void);
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static void usage(void);
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template <class T> void
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delete_and_clear(vector<T *> &v)
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{
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typename vector<T *>::const_iterator i;
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for (i = v.begin(); i != v.end(); i++)
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delete *i;
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v.clear();
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}
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config cfg;
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event_proc::event_proc() : _prio(-1)
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{
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// nothing
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}
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event_proc::~event_proc()
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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delete *i;
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_epsvec.clear();
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}
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void
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event_proc::add(eps *eps)
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{
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_epsvec.push_back(eps);
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}
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bool
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event_proc::matches(config &c)
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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if (!(*i)->do_match(c))
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return (false);
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return (true);
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}
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bool
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event_proc::run(config &c)
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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if (!(*i)->do_action(c))
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return (false);
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return (true);
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}
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action::action(const char *cmd)
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: _cmd(cmd)
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{
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// nothing
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}
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action::~action()
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{
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// nothing
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}
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bool
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action::do_action(config &c)
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{
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string s = c.expand_string(_cmd);
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if (Dflag)
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fprintf(stderr, "Executing '%s'\n", s.c_str());
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::system(s.c_str());
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return (true);
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}
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match::match(config &c, const char *var, const char *re)
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: _var(var)
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{
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string pattern = re;
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_re = "^";
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_re.append(c.expand_string(string(re)));
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_re.append("$");
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regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB);
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}
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match::~match()
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{
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regfree(&_regex);
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}
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bool
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match::do_match(config &c)
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{
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string value = c.get_variable(_var);
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bool retval;
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if (Dflag)
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fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
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value.c_str(), _re.c_str());
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retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
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return retval;
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}
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const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
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const string var_list::nothing = "";
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const string &
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var_list::get_variable(const string &var) const
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{
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map<string, string>::const_iterator i;
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i = _vars.find(var);
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if (i == _vars.end())
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return (var_list::bogus);
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return (i->second);
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}
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bool
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var_list::is_set(const string &var) const
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{
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return (_vars.find(var) != _vars.end());
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}
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void
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var_list::set_variable(const string &var, const string &val)
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{
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if (Dflag)
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fprintf(stderr, "%s=%s\n", var.c_str(), val.c_str());
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_vars[var] = val;
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}
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void
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config::reset(void)
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{
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_dir_list.clear();
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delete_and_clear(_var_list_table);
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delete_and_clear(_attach_list);
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delete_and_clear(_detach_list);
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delete_and_clear(_nomatch_list);
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delete_and_clear(_notify_list);
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}
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void
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config::parse_one_file(const char *fn)
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{
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if (Dflag)
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printf("Parsing %s\n", fn);
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yyin = fopen(fn, "r");
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if (yyin == NULL)
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err(1, "Cannot open config file %s", fn);
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if (yyparse() != 0)
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errx(1, "Cannot parse %s at line %d", fn, lineno);
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fclose(yyin);
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}
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void
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config::parse_files_in_dir(const char *dirname)
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{
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DIR *dirp;
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struct dirent *dp;
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char path[PATH_MAX];
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if (Dflag)
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printf("Parsing files in %s\n", dirname);
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dirp = opendir(dirname);
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if (dirp == NULL)
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return;
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readdir(dirp); /* Skip . */
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readdir(dirp); /* Skip .. */
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while ((dp = readdir(dirp)) != NULL) {
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if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
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snprintf(path, sizeof(path), "%s/%s",
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dirname, dp->d_name);
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parse_one_file(path);
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}
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}
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}
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class epv_greater {
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public:
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int operator()(event_proc *const&l1, event_proc *const&l2)
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{
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return (l1->get_priority() > l2->get_priority());
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}
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};
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void
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config::sort_vector(vector<event_proc *> &v)
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{
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sort(v.begin(), v.end(), epv_greater());
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}
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void
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config::parse(void)
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{
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vector<string>::const_iterator i;
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parse_one_file(CF);
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for (i = _dir_list.begin(); i != _dir_list.end(); i++)
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parse_files_in_dir((*i).c_str());
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sort_vector(_attach_list);
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sort_vector(_detach_list);
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sort_vector(_nomatch_list);
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sort_vector(_notify_list);
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}
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void
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config::drop_pidfile()
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{
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FILE *fp;
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if (_pidfile == "")
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return;
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fp = fopen(_pidfile.c_str(), "w");
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if (fp == NULL)
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return;
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fprintf(fp, "%d\n", getpid());
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fclose(fp);
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}
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void
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config::add_attach(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_attach_list.push_back(p);
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}
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void
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config::add_detach(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_detach_list.push_back(p);
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}
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void
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config::add_directory(const char *dir)
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{
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_dir_list.push_back(string(dir));
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}
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void
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config::add_nomatch(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_nomatch_list.push_back(p);
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}
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void
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config::add_notify(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_notify_list.push_back(p);
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}
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void
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config::set_pidfile(const char *fn)
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{
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_pidfile = string(fn);
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}
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void
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config::push_var_table()
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{
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var_list *vl;
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vl = new var_list();
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_var_list_table.push_back(vl);
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if (Dflag)
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fprintf(stderr, "Pushing table\n");
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}
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void
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config::pop_var_table()
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{
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delete _var_list_table.back();
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_var_list_table.pop_back();
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if (Dflag)
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fprintf(stderr, "Popping table\n");
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}
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void
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config::set_variable(const char *var, const char *val)
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{
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_var_list_table.back()->set_variable(var, val);
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}
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const string &
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config::get_variable(const string &var)
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{
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vector<var_list *>::reverse_iterator i;
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for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
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if ((*i)->is_set(var))
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return ((*i)->get_variable(var));
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}
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return (var_list::nothing);
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}
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bool
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config::is_id_char(char ch)
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{
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return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
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ch == '-'));
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}
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void
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config::expand_one(const char *&src, string &dst)
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{
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int count;
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string buffer, varstr;
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src++;
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// $$ -> $
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if (*src == '$') {
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dst.append(src++, 1);
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return;
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}
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// $(foo) -> $(foo)
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// Not sure if I want to support this or not, so for now we just pass
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// it through.
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if (*src == '(') {
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dst.append("$");
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count = 1;
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/* If the string ends before ) is matched , return. */
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while (count > 0 && *src) {
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if (*src == ')')
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count--;
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else if (*src == '(')
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count++;
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dst.append(src++, 1);
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}
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return;
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}
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// ${^A-Za-z] -> $\1
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if (!isalpha(*src)) {
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dst.append("$");
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dst.append(src++, 1);
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return;
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}
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// $var -> replace with value
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do {
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buffer.append(src++, 1);
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} while (is_id_char(*src));
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buffer.append("", 1);
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varstr = get_variable(buffer.c_str());
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dst.append(varstr);
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}
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const string
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config::expand_string(const string &s)
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{
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const char *src;
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string dst;
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src = s.c_str();
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while (*src) {
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if (*src == '$')
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expand_one(src, dst);
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else
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dst.append(src++, 1);
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}
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dst.append("", 1);
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return (dst);
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}
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bool
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config::chop_var(char *&buffer, char *&lhs, char *&rhs)
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{
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char *walker;
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if (*buffer == '\0')
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return (false);
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walker = lhs = buffer;
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while (is_id_char(*walker))
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walker++;
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if (*walker != '=')
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return (false);
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walker++; // skip =
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if (*walker == '"') {
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walker++; // skip "
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rhs = walker;
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while (*walker && *walker != '"')
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walker++;
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if (*walker != '"')
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return (false);
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rhs[-2] = '\0';
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*walker++ = '\0';
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} else {
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rhs = walker;
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while (*walker && !isspace(*walker))
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walker++;
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if (*walker != '\0')
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*walker++ = '\0';
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rhs[-1] = '\0';
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}
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while (isspace(*walker))
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walker++;
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buffer = walker;
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return (true);
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}
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char *
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config::set_vars(char *buffer)
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{
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char *lhs;
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char *rhs;
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while (1) {
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if (!chop_var(buffer, lhs, rhs))
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break;
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set_variable(lhs, rhs);
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}
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return (buffer);
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}
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void
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config::find_and_execute(char type)
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{
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vector<event_proc *> *l;
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vector<event_proc *>::const_iterator i;
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char *s;
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switch (type) {
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default:
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return;
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case notify:
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l = &_notify_list;
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s = "notify";
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break;
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case nomatch:
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l = &_nomatch_list;
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s = "nomatch";
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break;
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case attach:
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l = &_attach_list;
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s = "attach";
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break;
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case detach:
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l = &_detach_list;
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s = "detach";
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break;
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}
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if (Dflag)
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fprintf(stderr, "Processing %s event\n", s);
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for (i = l->begin(); i != l->end(); i++) {
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if ((*i)->matches(*this)) {
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(*i)->run(*this);
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break;
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}
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}
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}
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static void
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process_event(char *buffer)
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{
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char type;
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char *sp;
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sp = buffer + 1;
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if (Dflag)
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fprintf(stderr, "Processing event '%s'\n", buffer);
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type = *buffer++;
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cfg.push_var_table();
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// No match doesn't have a device, and the format is a little
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// different, so handle it separately.
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switch (type) {
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case notify:
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sp = cfg.set_vars(sp);
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break;
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case nomatch:
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//?vars at location on bus
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sp = cfg.set_vars(sp);
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if (strncmp(sp, "at ", 3) == 0)
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sp += 3;
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sp = cfg.set_vars(sp);
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if (strncmp(sp, "on ", 3) == 0)
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cfg.set_variable("bus", sp + 3);
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break;
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case attach: /*FALLTHROUGH*/
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case detach:
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sp = strchr(sp, ' ');
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if (sp == NULL)
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return; /* Can't happen? */
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*sp++ = '\0';
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cfg.set_variable("device-name", buffer);
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if (strncmp(sp, "at ", 3) == 0)
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sp += 3;
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sp = cfg.set_vars(sp);
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if (strncmp(sp, "on ", 3) == 0)
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cfg.set_variable("bus", sp + 3);
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break;
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}
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cfg.find_and_execute(type);
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cfg.pop_var_table();
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}
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int
|
||
create_socket(const char *name)
|
||
{
|
||
int fd, slen;
|
||
struct sockaddr_un sun;
|
||
|
||
if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
|
||
err(1, "socket");
|
||
bzero(&sun, sizeof(sun));
|
||
sun.sun_family = AF_UNIX;
|
||
strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
|
||
slen = SUN_LEN(&sun);
|
||
unlink(name);
|
||
if (bind(fd, (struct sockaddr *) & sun, slen) < 0)
|
||
err(1, "bind");
|
||
listen(fd, 4);
|
||
fchown(fd, 0, 0); /* XXX - root.wheel */
|
||
fchmod(fd, 0660);
|
||
return (fd);
|
||
}
|
||
|
||
list<int> clients;
|
||
|
||
void
|
||
notify_clients(const char *data, int len)
|
||
{
|
||
list<int> bad;
|
||
list<int>::const_iterator i;
|
||
|
||
for (i = clients.begin(); i != clients.end(); i++) {
|
||
if (write(*i, data, len) <= 0) {
|
||
bad.push_back(*i);
|
||
close(*i);
|
||
}
|
||
}
|
||
|
||
for (i = bad.begin(); i != bad.end(); i++)
|
||
clients.erase(find(clients.begin(), clients.end(), *i));
|
||
}
|
||
|
||
void
|
||
new_client(int fd)
|
||
{
|
||
int s;
|
||
|
||
s = accept(fd, NULL, NULL);
|
||
if (s != -1)
|
||
clients.push_back(s);
|
||
}
|
||
|
||
static void
|
||
event_loop(void)
|
||
{
|
||
int rv;
|
||
int fd;
|
||
char buffer[DEVCTL_MAXBUF];
|
||
int once = 0;
|
||
int server_fd, max_fd;
|
||
timeval tv;
|
||
fd_set fds;
|
||
|
||
fd = open(PATH_DEVCTL, O_RDONLY);
|
||
if (fd == -1)
|
||
err(1, "Can't open devctl device %s", PATH_DEVCTL);
|
||
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
|
||
err(1, "Can't set close-on-exec flag on devctl");
|
||
server_fd = create_socket(PIPE);
|
||
max_fd = max(fd, server_fd) + 1;
|
||
while (1) {
|
||
if (romeo_must_die)
|
||
break;
|
||
if (!once && !dflag && !nflag) {
|
||
// Check to see if we have any events pending.
|
||
tv.tv_sec = 0;
|
||
tv.tv_usec = 0;
|
||
FD_ZERO(&fds);
|
||
FD_SET(fd, &fds);
|
||
rv = select(fd + 1, &fds, &fds, &fds, &tv);
|
||
// No events -> we've processed all pending events
|
||
if (rv == 0) {
|
||
if (Dflag)
|
||
fprintf(stderr, "Calling daemon\n");
|
||
daemon(0, 0);
|
||
cfg.drop_pidfile();
|
||
once++;
|
||
}
|
||
}
|
||
FD_ZERO(&fds);
|
||
FD_SET(fd, &fds);
|
||
FD_SET(server_fd, &fds);
|
||
rv = select(max_fd, &fds, NULL, NULL, NULL);
|
||
if (rv == -1) {
|
||
if (errno == EINTR)
|
||
continue;
|
||
err(1, "select");
|
||
}
|
||
if (FD_ISSET(fd, &fds)) {
|
||
rv = read(fd, buffer, sizeof(buffer) - 1);
|
||
if (rv > 0) {
|
||
notify_clients(buffer, rv);
|
||
buffer[rv] = '\0';
|
||
while (buffer[--rv] == '\n')
|
||
buffer[rv] = '\0';
|
||
process_event(buffer);
|
||
} else if (rv < 0) {
|
||
if (errno != EINTR)
|
||
break;
|
||
} else {
|
||
/* EOF */
|
||
break;
|
||
}
|
||
}
|
||
if (FD_ISSET(server_fd, &fds))
|
||
new_client(server_fd);
|
||
}
|
||
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);
|
||
}
|
||
|
||
void
|
||
add_notify(int prio, event_proc *p)
|
||
{
|
||
cfg.add_notify(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(cfg, 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]\n", getprogname());
|
||
exit(1);
|
||
}
|
||
|
||
static void
|
||
check_devd_enabled()
|
||
{
|
||
int val = 0;
|
||
size_t len;
|
||
|
||
len = sizeof(val);
|
||
if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
|
||
errx(1, "devctl sysctl missing from kernel!");
|
||
if (val) {
|
||
warnx("Setting " SYSCTL " to 0");
|
||
val = 0;
|
||
sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
|
||
}
|
||
}
|
||
|
||
/*
|
||
* main
|
||
*/
|
||
int
|
||
main(int argc, char **argv)
|
||
{
|
||
int ch;
|
||
|
||
check_devd_enabled();
|
||
while ((ch = getopt(argc, argv, "Ddn")) != -1) {
|
||
switch (ch) {
|
||
case 'D':
|
||
Dflag++;
|
||
break;
|
||
case 'd':
|
||
dflag++;
|
||
break;
|
||
case 'n':
|
||
nflag++;
|
||
break;
|
||
default:
|
||
usage();
|
||
}
|
||
}
|
||
|
||
cfg.parse();
|
||
if (!dflag && nflag) {
|
||
daemon(0, 0);
|
||
cfg.drop_pidfile();
|
||
}
|
||
signal(SIGHUP, gensighand);
|
||
signal(SIGINT, gensighand);
|
||
signal(SIGTERM, gensighand);
|
||
event_loop();
|
||
return (0);
|
||
}
|