e1334f935f
their socket connection any time, and devd only notices that when it gets an error trying to write an event to the client. On a system with no device change activity, clients could connect and disappear repeatedly without devd noticing, leading to an ever-growing list of open socket descriptors in devd. Now devd uses poll(2) looking for POLLHUP on all existing clients every time a new client connection is established, and also periodically (once a minute) to proactively find zombie clients and reap the socket descriptors. It also now has a connection limit, configurable with a new -l <num> command line arg. When the maximum number of connections is reached it stops accepting new connections until some current clients drop off. Reviewed by: imp Approved by: cognet (mentor)
1145 lines
23 KiB
C++
1145 lines
23 KiB
C++
/*-
|
||
* Copyright (c) 2002-2010 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.
|
||
*
|
||
* my_system is a variation on lib/libc/stdlib/system.c:
|
||
*
|
||
* Copyright (c) 1988, 1993
|
||
* The Regents of the University of California. 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.
|
||
* 4. Neither the name of the University nor the names of its contributors
|
||
* may be used to endorse or promote products derived from this software
|
||
* without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 devd.conf and devd man pages need a lot of help:
|
||
// - devd needs to document the unix domain socket
|
||
// - devd.conf needs more details on the supported statements.
|
||
|
||
#include <sys/cdefs.h>
|
||
__FBSDID("$FreeBSD$");
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/socket.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/sysctl.h>
|
||
#include <sys/types.h>
|
||
#include <sys/wait.h>
|
||
#include <sys/un.h>
|
||
|
||
#include <ctype.h>
|
||
#include <dirent.h>
|
||
#include <errno.h>
|
||
#include <err.h>
|
||
#include <fcntl.h>
|
||
#include <libutil.h>
|
||
#include <paths.h>
|
||
#include <poll.h>
|
||
#include <regex.h>
|
||
#include <signal.h>
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <string.h>
|
||
#include <unistd.h>
|
||
|
||
#include <algorithm>
|
||
#include <map>
|
||
#include <string>
|
||
#include <list>
|
||
#include <vector>
|
||
|
||
#include "devd.h" /* C compatible definitions */
|
||
#include "devd.hh" /* C++ class definitions */
|
||
|
||
#define PIPE "/var/run/devd.pipe"
|
||
#define CF "/etc/devd.conf"
|
||
#define SYSCTL "hw.bus.devctl_disable"
|
||
|
||
using namespace std;
|
||
|
||
extern FILE *yyin;
|
||
extern int lineno;
|
||
|
||
static const char notify = '!';
|
||
static const char nomatch = '?';
|
||
static const char attach = '+';
|
||
static const char detach = '-';
|
||
|
||
static struct pidfh *pfh;
|
||
|
||
int Dflag;
|
||
int dflag;
|
||
int nflag;
|
||
int romeo_must_die = 0;
|
||
|
||
static const char *configfile = CF;
|
||
|
||
static void event_loop(void);
|
||
static void usage(void);
|
||
|
||
template <class T> void
|
||
delete_and_clear(vector<T *> &v)
|
||
{
|
||
typename vector<T *>::const_iterator i;
|
||
|
||
for (i = v.begin(); i != v.end(); ++i)
|
||
delete *i;
|
||
v.clear();
|
||
}
|
||
|
||
config cfg;
|
||
|
||
event_proc::event_proc() : _prio(-1)
|
||
{
|
||
// nothing
|
||
}
|
||
|
||
event_proc::~event_proc()
|
||
{
|
||
delete_and_clear(_epsvec);
|
||
}
|
||
|
||
void
|
||
event_proc::add(eps *eps)
|
||
{
|
||
_epsvec.push_back(eps);
|
||
}
|
||
|
||
bool
|
||
event_proc::matches(config &c) const
|
||
{
|
||
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) const
|
||
{
|
||
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
|
||
}
|
||
|
||
static int
|
||
my_system(const char *command)
|
||
{
|
||
pid_t pid, savedpid;
|
||
int pstat;
|
||
struct sigaction ign, intact, quitact;
|
||
sigset_t newsigblock, oldsigblock;
|
||
|
||
if (!command) /* just checking... */
|
||
return(1);
|
||
|
||
/*
|
||
* Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
|
||
* existing signal dispositions.
|
||
*/
|
||
ign.sa_handler = SIG_IGN;
|
||
::sigemptyset(&ign.sa_mask);
|
||
ign.sa_flags = 0;
|
||
::sigaction(SIGINT, &ign, &intact);
|
||
::sigaction(SIGQUIT, &ign, &quitact);
|
||
::sigemptyset(&newsigblock);
|
||
::sigaddset(&newsigblock, SIGCHLD);
|
||
::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
|
||
switch (pid = ::fork()) {
|
||
case -1: /* error */
|
||
break;
|
||
case 0: /* child */
|
||
/*
|
||
* Restore original signal dispositions and exec the command.
|
||
*/
|
||
::sigaction(SIGINT, &intact, NULL);
|
||
::sigaction(SIGQUIT, &quitact, NULL);
|
||
::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
|
||
/*
|
||
* Close the PID file, and all other open descriptors.
|
||
* Inherit std{in,out,err} only.
|
||
*/
|
||
cfg.close_pidfile();
|
||
::closefrom(3);
|
||
::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
|
||
::_exit(127);
|
||
default: /* parent */
|
||
savedpid = pid;
|
||
do {
|
||
pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0);
|
||
} while (pid == -1 && errno == EINTR);
|
||
break;
|
||
}
|
||
::sigaction(SIGINT, &intact, NULL);
|
||
::sigaction(SIGQUIT, &quitact, NULL);
|
||
::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
|
||
return (pid == -1 ? -1 : pstat);
|
||
}
|
||
|
||
bool
|
||
action::do_action(config &c)
|
||
{
|
||
string s = c.expand_string(_cmd);
|
||
if (Dflag)
|
||
fprintf(stderr, "Executing '%s'\n", s.c_str());
|
||
my_system(s.c_str());
|
||
return (true);
|
||
}
|
||
|
||
match::match(config &c, const char *var, const char *re)
|
||
: _var(var), _re("^")
|
||
{
|
||
if (!c.expand_string(string(re)).empty() &&
|
||
c.expand_string(string(re)).at(0) == '!') {
|
||
_re.append(c.expand_string(string(re)).substr(1));
|
||
_inv = 1;
|
||
} else {
|
||
_re.append(c.expand_string(string(re)));
|
||
_inv = 0;
|
||
}
|
||
_re.append("$");
|
||
regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
|
||
}
|
||
|
||
match::~match()
|
||
{
|
||
regfree(&_regex);
|
||
}
|
||
|
||
bool
|
||
match::do_match(config &c)
|
||
{
|
||
const string &value = c.get_variable(_var);
|
||
bool retval;
|
||
|
||
if (Dflag)
|
||
fprintf(stderr, "Testing %s=%s against %s, invert=%d\n",
|
||
_var.c_str(), value.c_str(), _re.c_str(), _inv);
|
||
|
||
retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
|
||
if (_inv == 1)
|
||
retval = (retval == 0) ? 1 : 0;
|
||
|
||
return retval;
|
||
}
|
||
|
||
#include <sys/sockio.h>
|
||
#include <net/if.h>
|
||
#include <net/if_media.h>
|
||
|
||
media::media(config &, const char *var, const char *type)
|
||
: _var(var), _type(-1)
|
||
{
|
||
static struct ifmedia_description media_types[] = {
|
||
{ IFM_ETHER, "Ethernet" },
|
||
{ IFM_TOKEN, "Tokenring" },
|
||
{ IFM_FDDI, "FDDI" },
|
||
{ IFM_IEEE80211, "802.11" },
|
||
{ IFM_ATM, "ATM" },
|
||
{ -1, "unknown" },
|
||
{ 0, NULL },
|
||
};
|
||
for (int i = 0; media_types[i].ifmt_string != NULL; ++i)
|
||
if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
|
||
_type = media_types[i].ifmt_word;
|
||
break;
|
||
}
|
||
}
|
||
|
||
media::~media()
|
||
{
|
||
}
|
||
|
||
bool
|
||
media::do_match(config &c)
|
||
{
|
||
string value;
|
||
struct ifmediareq ifmr;
|
||
bool retval;
|
||
int s;
|
||
|
||
// Since we can be called from both a device attach/detach
|
||
// context where device-name is defined and what we want,
|
||
// as well as from a link status context, where subsystem is
|
||
// the name of interest, first try device-name and fall back
|
||
// to subsystem if none exists.
|
||
value = c.get_variable("device-name");
|
||
if (value.length() == 0)
|
||
value = c.get_variable("subsystem");
|
||
if (Dflag)
|
||
fprintf(stderr, "Testing media type of %s against 0x%x\n",
|
||
value.c_str(), _type);
|
||
|
||
retval = false;
|
||
|
||
s = socket(PF_INET, SOCK_DGRAM, 0);
|
||
if (s >= 0) {
|
||
memset(&ifmr, 0, sizeof(ifmr));
|
||
strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
|
||
|
||
if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
|
||
ifmr.ifm_status & IFM_AVALID) {
|
||
if (Dflag)
|
||
fprintf(stderr, "%s has media type 0x%x\n",
|
||
value.c_str(), IFM_TYPE(ifmr.ifm_active));
|
||
retval = (IFM_TYPE(ifmr.ifm_active) == _type);
|
||
} else if (_type == -1) {
|
||
if (Dflag)
|
||
fprintf(stderr, "%s has unknown media type\n",
|
||
value.c_str());
|
||
retval = true;
|
||
}
|
||
close(s);
|
||
}
|
||
|
||
return retval;
|
||
}
|
||
|
||
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)
|
||
{
|
||
if (Dflag)
|
||
fprintf(stderr, "setting %s=%s\n", var.c_str(), val.c_str());
|
||
_vars[var] = val;
|
||
}
|
||
|
||
void
|
||
config::reset(void)
|
||
{
|
||
_dir_list.clear();
|
||
delete_and_clear(_var_list_table);
|
||
delete_and_clear(_attach_list);
|
||
delete_and_clear(_detach_list);
|
||
delete_and_clear(_nomatch_list);
|
||
delete_and_clear(_notify_list);
|
||
}
|
||
|
||
void
|
||
config::parse_one_file(const char *fn)
|
||
{
|
||
if (Dflag)
|
||
fprintf(stderr, "Parsing %s\n", fn);
|
||
yyin = fopen(fn, "r");
|
||
if (yyin == NULL)
|
||
err(1, "Cannot open config file %s", fn);
|
||
lineno = 1;
|
||
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)
|
||
fprintf(stderr, "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);
|
||
}
|
||
}
|
||
closedir(dirp);
|
||
}
|
||
|
||
class epv_greater {
|
||
public:
|
||
int operator()(event_proc *const&l1, event_proc *const&l2) const
|
||
{
|
||
return (l1->get_priority() > l2->get_priority());
|
||
}
|
||
};
|
||
|
||
void
|
||
config::sort_vector(vector<event_proc *> &v)
|
||
{
|
||
stable_sort(v.begin(), v.end(), epv_greater());
|
||
}
|
||
|
||
void
|
||
config::parse(void)
|
||
{
|
||
vector<string>::const_iterator i;
|
||
|
||
parse_one_file(configfile);
|
||
for (i = _dir_list.begin(); i != _dir_list.end(); ++i)
|
||
parse_files_in_dir((*i).c_str());
|
||
sort_vector(_attach_list);
|
||
sort_vector(_detach_list);
|
||
sort_vector(_nomatch_list);
|
||
sort_vector(_notify_list);
|
||
}
|
||
|
||
void
|
||
config::open_pidfile()
|
||
{
|
||
pid_t otherpid;
|
||
|
||
if (_pidfile == "")
|
||
return;
|
||
pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
|
||
if (pfh == NULL) {
|
||
if (errno == EEXIST)
|
||
errx(1, "devd already running, pid: %d", (int)otherpid);
|
||
warn("cannot open pid file");
|
||
}
|
||
}
|
||
|
||
void
|
||
config::write_pidfile()
|
||
{
|
||
|
||
pidfile_write(pfh);
|
||
}
|
||
|
||
void
|
||
config::close_pidfile()
|
||
{
|
||
|
||
pidfile_close(pfh);
|
||
}
|
||
|
||
void
|
||
config::remove_pidfile()
|
||
{
|
||
|
||
pidfile_remove(pfh);
|
||
}
|
||
|
||
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::add_notify(int prio, event_proc *p)
|
||
{
|
||
p->set_priority(prio);
|
||
_notify_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);
|
||
if (Dflag)
|
||
fprintf(stderr, "Pushing table\n");
|
||
}
|
||
|
||
void
|
||
config::pop_var_table()
|
||
{
|
||
delete _var_list_table.back();
|
||
_var_list_table.pop_back();
|
||
if (Dflag)
|
||
fprintf(stderr, "Popping table\n");
|
||
}
|
||
|
||
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 ((*i)->get_variable(var));
|
||
}
|
||
return (var_list::nothing);
|
||
}
|
||
|
||
bool
|
||
config::is_id_char(char ch) const
|
||
{
|
||
return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
|
||
ch == '-'));
|
||
}
|
||
|
||
void
|
||
config::expand_one(const char *&src, string &dst)
|
||
{
|
||
int count;
|
||
string buffer;
|
||
|
||
src++;
|
||
// $$ -> $
|
||
if (*src == '$') {
|
||
dst.append(src++, 1);
|
||
return;
|
||
}
|
||
|
||
// $(foo) -> $(foo)
|
||
// Not sure if I want to support this or not, so for now we just pass
|
||
// it through.
|
||
if (*src == '(') {
|
||
dst.append("$");
|
||
count = 1;
|
||
/* If the string ends before ) is matched , return. */
|
||
while (count > 0 && *src) {
|
||
if (*src == ')')
|
||
count--;
|
||
else if (*src == '(')
|
||
count++;
|
||
dst.append(src++, 1);
|
||
}
|
||
return;
|
||
}
|
||
|
||
// ${^A-Za-z] -> $\1
|
||
if (!isalpha(*src)) {
|
||
dst.append("$");
|
||
dst.append(src++, 1);
|
||
return;
|
||
}
|
||
|
||
// $var -> replace with value
|
||
do {
|
||
buffer.append(src++, 1);
|
||
} while (is_id_char(*src));
|
||
buffer.append("", 1);
|
||
dst.append(get_variable(buffer.c_str()));
|
||
}
|
||
|
||
const string
|
||
config::expand_string(const string &s)
|
||
{
|
||
const char *src;
|
||
string dst;
|
||
|
||
src = s.c_str();
|
||
while (*src) {
|
||
if (*src == '$')
|
||
expand_one(src, dst);
|
||
else
|
||
dst.append(src++, 1);
|
||
}
|
||
dst.append("", 1);
|
||
|
||
return (dst);
|
||
}
|
||
|
||
bool
|
||
config::chop_var(char *&buffer, char *&lhs, char *&rhs)
|
||
{
|
||
char *walker;
|
||
|
||
if (*buffer == '\0')
|
||
return (false);
|
||
walker = lhs = buffer;
|
||
while (is_id_char(*walker))
|
||
walker++;
|
||
if (*walker != '=')
|
||
return (false);
|
||
walker++; // skip =
|
||
if (*walker == '"') {
|
||
walker++; // skip "
|
||
rhs = walker;
|
||
while (*walker && *walker != '"')
|
||
walker++;
|
||
if (*walker != '"')
|
||
return (false);
|
||
rhs[-2] = '\0';
|
||
*walker++ = '\0';
|
||
} else {
|
||
rhs = walker;
|
||
while (*walker && !isspace(*walker))
|
||
walker++;
|
||
if (*walker != '\0')
|
||
*walker++ = '\0';
|
||
rhs[-1] = '\0';
|
||
}
|
||
while (isspace(*walker))
|
||
walker++;
|
||
buffer = walker;
|
||
return (true);
|
||
}
|
||
|
||
|
||
char *
|
||
config::set_vars(char *buffer)
|
||
{
|
||
char *lhs;
|
||
char *rhs;
|
||
|
||
while (1) {
|
||
if (!chop_var(buffer, lhs, rhs))
|
||
break;
|
||
set_variable(lhs, rhs);
|
||
}
|
||
return (buffer);
|
||
}
|
||
|
||
void
|
||
config::find_and_execute(char type)
|
||
{
|
||
vector<event_proc *> *l;
|
||
vector<event_proc *>::const_iterator i;
|
||
const char *s;
|
||
|
||
switch (type) {
|
||
default:
|
||
return;
|
||
case notify:
|
||
l = &_notify_list;
|
||
s = "notify";
|
||
break;
|
||
case nomatch:
|
||
l = &_nomatch_list;
|
||
s = "nomatch";
|
||
break;
|
||
case attach:
|
||
l = &_attach_list;
|
||
s = "attach";
|
||
break;
|
||
case detach:
|
||
l = &_detach_list;
|
||
s = "detach";
|
||
break;
|
||
}
|
||
if (Dflag)
|
||
fprintf(stderr, "Processing %s event\n", s);
|
||
for (i = l->begin(); i != l->end(); ++i) {
|
||
if ((*i)->matches(*this)) {
|
||
(*i)->run(*this);
|
||
break;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
|
||
static void
|
||
process_event(char *buffer)
|
||
{
|
||
char type;
|
||
char *sp;
|
||
|
||
sp = buffer + 1;
|
||
if (Dflag)
|
||
fprintf(stderr, "Processing event '%s'\n", buffer);
|
||
type = *buffer++;
|
||
cfg.push_var_table();
|
||
// No match doesn't have a device, and the format is a little
|
||
// different, so handle it separately.
|
||
switch (type) {
|
||
case notify:
|
||
sp = cfg.set_vars(sp);
|
||
break;
|
||
case nomatch:
|
||
//? at location pnp-info on bus
|
||
sp = strchr(sp, ' ');
|
||
if (sp == NULL)
|
||
return; /* Can't happen? */
|
||
*sp++ = '\0';
|
||
while (isspace(*sp))
|
||
sp++;
|
||
if (strncmp(sp, "at ", 3) == 0)
|
||
sp += 3;
|
||
sp = cfg.set_vars(sp);
|
||
while (isspace(*sp))
|
||
sp++;
|
||
if (strncmp(sp, "on ", 3) == 0)
|
||
cfg.set_variable("bus", sp + 3);
|
||
break;
|
||
case attach: /*FALLTHROUGH*/
|
||
case detach:
|
||
sp = strchr(sp, ' ');
|
||
if (sp == NULL)
|
||
return; /* Can't happen? */
|
||
*sp++ = '\0';
|
||
cfg.set_variable("device-name", buffer);
|
||
while (isspace(*sp))
|
||
sp++;
|
||
if (strncmp(sp, "at ", 3) == 0)
|
||
sp += 3;
|
||
sp = cfg.set_vars(sp);
|
||
while (isspace(*sp))
|
||
sp++;
|
||
if (strncmp(sp, "on ", 3) == 0)
|
||
cfg.set_variable("bus", sp + 3);
|
||
break;
|
||
}
|
||
|
||
cfg.find_and_execute(type);
|
||
cfg.pop_var_table();
|
||
}
|
||
|
||
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 (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
|
||
err(1, "fcntl");
|
||
if (::bind(fd, (struct sockaddr *) & sun, slen) < 0)
|
||
err(1, "bind");
|
||
listen(fd, 4);
|
||
chown(name, 0, 0); /* XXX - root.wheel */
|
||
chmod(name, 0666);
|
||
return (fd);
|
||
}
|
||
|
||
unsigned int max_clients = 10; /* Default, can be overriden on cmdline. */
|
||
unsigned int num_clients;
|
||
list<int> clients;
|
||
|
||
void
|
||
notify_clients(const char *data, int len)
|
||
{
|
||
list<int>::iterator i;
|
||
|
||
/*
|
||
* Deliver the data to all clients. Throw clients overboard at the
|
||
* first sign of trouble. This reaps clients who've died or closed
|
||
* their sockets, and also clients who are alive but failing to keep up
|
||
* (or who are maliciously not reading, to consume buffer space in
|
||
* kernel memory or tie up the limited number of available connections).
|
||
*/
|
||
for (i = clients.begin(); i != clients.end(); ) {
|
||
if (write(*i, data, len) != len) {
|
||
--num_clients;
|
||
close(*i);
|
||
i = clients.erase(i);
|
||
} else
|
||
++i;
|
||
}
|
||
}
|
||
|
||
void
|
||
check_clients(void)
|
||
{
|
||
int s;
|
||
struct pollfd pfd;
|
||
list<int>::iterator i;
|
||
|
||
/*
|
||
* Check all existing clients to see if any of them have disappeared.
|
||
* Normally we reap clients when we get an error trying to send them an
|
||
* event. This check eliminates the problem of an ever-growing list of
|
||
* zombie clients because we're never writing to them on a system
|
||
* without frequent device-change activity.
|
||
*/
|
||
pfd.events = 0;
|
||
for (i = clients.begin(); i != clients.end(); ) {
|
||
pfd.fd = *i;
|
||
s = poll(&pfd, 1, 0);
|
||
if ((s < 0 && s != EINTR ) ||
|
||
(s > 0 && (pfd.revents & POLLHUP))) {
|
||
--num_clients;
|
||
close(*i);
|
||
i = clients.erase(i);
|
||
} else
|
||
++i;
|
||
}
|
||
}
|
||
|
||
void
|
||
new_client(int fd)
|
||
{
|
||
int s;
|
||
|
||
/*
|
||
* First go reap any zombie clients, then accept the connection, and
|
||
* shut down the read side to stop clients from consuming kernel memory
|
||
* by sending large buffers full of data we'll never read.
|
||
*/
|
||
check_clients();
|
||
s = accept(fd, NULL, NULL);
|
||
if (s != -1) {
|
||
shutdown(s, SHUT_RD);
|
||
clients.push_back(s);
|
||
++num_clients;
|
||
}
|
||
}
|
||
|
||
static void
|
||
event_loop(void)
|
||
{
|
||
int rv;
|
||
int fd;
|
||
char buffer[DEVCTL_MAXBUF];
|
||
int once = 0;
|
||
int server_fd, max_fd;
|
||
int accepting;
|
||
timeval tv;
|
||
fd_set fds;
|
||
|
||
fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC);
|
||
if (fd == -1)
|
||
err(1, "Can't open devctl device %s", PATH_DEVCTL);
|
||
server_fd = create_socket(PIPE);
|
||
accepting = 1;
|
||
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");
|
||
cfg.remove_pidfile();
|
||
cfg.open_pidfile();
|
||
daemon(0, 0);
|
||
cfg.write_pidfile();
|
||
once++;
|
||
}
|
||
}
|
||
/*
|
||
* When we've already got the max number of clients, stop
|
||
* accepting new connections (don't put server_fd in the set),
|
||
* shrink the accept() queue to reject connections quickly, and
|
||
* poll the existing clients more often, so that we notice more
|
||
* quickly when any of them disappear to free up client slots.
|
||
*/
|
||
FD_ZERO(&fds);
|
||
FD_SET(fd, &fds);
|
||
if (num_clients < max_clients) {
|
||
if (!accepting) {
|
||
listen(server_fd, max_clients);
|
||
accepting = 1;
|
||
}
|
||
FD_SET(server_fd, &fds);
|
||
tv.tv_sec = 60;
|
||
tv.tv_usec = 0;
|
||
} else {
|
||
if (accepting) {
|
||
listen(server_fd, 0);
|
||
accepting = 0;
|
||
}
|
||
tv.tv_sec = 2;
|
||
tv.tv_usec = 0;
|
||
}
|
||
rv = select(max_fd, &fds, NULL, NULL, &tv);
|
||
if (rv == -1) {
|
||
if (errno == EINTR)
|
||
continue;
|
||
err(1, "select");
|
||
} else if (rv == 0)
|
||
check_clients();
|
||
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);
|
||
}
|
||
|
||
eps *
|
||
new_media(const char *var, const char *re)
|
||
{
|
||
eps *e = new media(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 [-Ddn] [-l connlimit] [-f file]\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, "Ddf:l:n")) != -1) {
|
||
switch (ch) {
|
||
case 'D':
|
||
Dflag++;
|
||
break;
|
||
case 'd':
|
||
dflag++;
|
||
break;
|
||
case 'f':
|
||
configfile = optarg;
|
||
break;
|
||
case 'l':
|
||
max_clients = MAX(1, strtoul(optarg, NULL, 0));
|
||
break;
|
||
case 'n':
|
||
nflag++;
|
||
break;
|
||
default:
|
||
usage();
|
||
}
|
||
}
|
||
|
||
cfg.parse();
|
||
if (!dflag && nflag) {
|
||
cfg.open_pidfile();
|
||
daemon(0, 0);
|
||
cfg.write_pidfile();
|
||
}
|
||
signal(SIGPIPE, SIG_IGN);
|
||
signal(SIGHUP, gensighand);
|
||
signal(SIGINT, gensighand);
|
||
signal(SIGTERM, gensighand);
|
||
event_loop();
|
||
return (0);
|
||
}
|