diff options
Diffstat (limited to 'sbin/devd/devd.cc')
| -rw-r--r-- | sbin/devd/devd.cc | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/sbin/devd/devd.cc b/sbin/devd/devd.cc new file mode 100644 index 0000000..1265b75 --- /dev/null +++ b/sbin/devd/devd.cc @@ -0,0 +1,591 @@ +/*- + * 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); +} |
