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/* Copyright (C) 2013-2015 Codership Oy <info@codership.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. */
#ifndef WSREP_UTILS_H
#define WSREP_UTILS_H
#include "wsrep_priv.h"
#include "wsrep_mysqld.h"
unsigned int wsrep_check_ip (const char* const addr, bool *is_ipv6);
size_t wsrep_guess_ip (char* buf, size_t buf_len);
/* returns the length of the host part of the address string */
size_t wsrep_host_len(const char* addr, size_t addr_len);
namespace wsp {
class Address {
public:
Address()
: m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false)
{
memset(m_address, 0, sizeof(m_address));
}
Address(const char *addr_in)
: m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false)
{
memset(m_address, 0, sizeof(m_address));
parse_addr(addr_in);
}
bool is_valid() { return m_valid; }
bool is_ipv6() { return (m_family == INET6); }
const char* get_address() { return m_address; }
size_t get_address_len() { return m_address_len; }
int get_port() { return m_port; }
void set_port(int port) { m_port= port; }
private:
enum family {
UNSPEC= 0,
INET, /* IPv4 */
INET6, /* IPv6 */
};
char m_address[256];
size_t m_address_len;
family m_family;
int m_port;
bool m_valid;
void parse_addr(const char *addr_in) {
const char *start;
const char *end;
const char *port;
const char* open_bracket= strchr(const_cast<char *>(addr_in), '[');
const char* close_bracket= strchr(const_cast<char *>(addr_in), ']');
const char* colon= strchr(const_cast<char *>(addr_in), ':');
const char* dot= strchr(const_cast<char *>(addr_in), '.');
int cc= colon_count(addr_in);
if (open_bracket != NULL ||
dot == NULL ||
(colon != NULL && (dot == NULL || colon < dot)))
{
// This could be an IPv6 address or a hostname
if (open_bracket != NULL) {
/* Sanity check: Address with '[' must include ']' */
if (close_bracket == NULL &&
open_bracket < close_bracket) /* Error: malformed address */
{
m_valid= false;
return;
}
start= open_bracket + 1;
end= close_bracket;
/* Check for port */
port= strchr(close_bracket, ':');
if ((port != NULL) && parse_port(port + 1))
{
return; /* Error: invalid port */
}
m_family= INET6;
}
else
{
switch (cc) {
case 0:
/* Hostname with no port */
start= addr_in;
end= addr_in + strlen(addr_in);
break;
case 1:
/* Hostname with port (host:port) */
start= addr_in;
end= colon;
if (parse_port(colon + 1))
return; /* Error: invalid port */
break;
default:
/* IPv6 address */
start= addr_in;
end= addr_in + strlen(addr_in);
m_family= INET6;
break;
}
}
} else { /* IPv4 address or hostname */
start= addr_in;
if (colon != NULL) { /* Port */
end= colon;
if (parse_port(colon + 1))
return; /* Error: invalid port */
} else {
end= addr_in + strlen(addr_in);
}
}
size_t len= end - start;
/* Safety */
if (len >= sizeof(m_address))
{
// The supplied address is too large to fit into the internal buffer.
m_valid= false;
return;
}
memcpy(m_address, start, len);
m_address[len]= '\0';
m_address_len= ++ len;
m_valid= true;
return;
}
int colon_count(const char *addr) {
int count= 0, i= 0;
while(addr[i] != '\0')
{
if (addr[i] == ':') ++count;
++ i;
}
return count;
}
bool parse_port(const char *port) {
errno= 0; /* Reset the errno */
m_port= strtol(port, NULL, 10);
if (errno == EINVAL || errno == ERANGE)
{
m_port= 0; /* Error: invalid port */
m_valid= false;
return true;
}
return false;
}
};
class Config_state
{
public:
Config_state() : view_(), status_(wsrep::server_state::s_disconnected)
{}
void set(const wsrep::view& view)
{
wsrep_notify_status(status_, &view);
lock();
view_= view;
unlock();
}
void set(enum wsrep::server_state::state status)
{
if (status == wsrep::server_state::s_donor ||
status == wsrep::server_state::s_synced)
wsrep_notify_status(status, &view_);
else
wsrep_notify_status(status);
lock();
status_= status;
unlock();
}
const wsrep::view& get_view_info() const
{
return view_;
}
enum wsrep::server_state::state get_status() const
{
return status_;
}
int lock()
{
return mysql_mutex_lock(&LOCK_wsrep_config_state);
}
int unlock()
{
return mysql_mutex_unlock(&LOCK_wsrep_config_state);
}
private:
wsrep::view view_;
enum wsrep::server_state::state status_;
};
} /* namespace wsp */
extern wsp::Config_state *wsrep_config_state;
namespace wsp {
/* a class to manage env vars array */
class env
{
private:
size_t len_;
char** env_;
int errno_;
bool ctor_common(char** e);
void dtor();
env& operator =(env);
public:
explicit env(char** env);
explicit env(const env&);
~env();
int append(const char* var); /* add a new env. var */
int error() const { return errno_; }
char** operator()() { return env_; }
};
/* A small class to run external programs. */
class process
{
private:
const char* const str_;
FILE* io_;
int err_;
pid_t pid_;
public:
/*! @arg type is a pointer to a null-terminated string which must contain
either the letter 'r' for reading or the letter 'w' for writing.
@arg env optional null-terminated vector of environment variables
*/
process (const char* cmd, const char* type, char** env);
~process ();
FILE* pipe () { return io_; }
int error() { return err_; }
int wait ();
const char* cmd() { return str_; }
};
class thd
{
class thd_init
{
public:
thd_init() { my_thread_init(); }
~thd_init() { my_thread_end(); }
}
init;
thd (const thd&);
thd& operator= (const thd&);
public:
thd(my_bool wsrep_on, bool system_thread=false);
~thd();
THD* const ptr;
};
class string
{
public:
string() : string_(0) {}
explicit string(size_t s) : string_(static_cast<char*>(malloc(s))) {}
char* operator()() { return string_; }
void set(char* str) { if (string_) free (string_); string_= str; }
~string() { set (0); }
private:
char* string_;
};
/* scope level lock */
class auto_lock
{
public:
auto_lock(mysql_mutex_t* m) : m_(m) { mysql_mutex_lock(m_); }
~auto_lock() { mysql_mutex_unlock(m_); }
private:
mysql_mutex_t& operator =(mysql_mutex_t&);
mysql_mutex_t* const m_;
};
#ifdef REMOVED
class lock
{
pthread_mutex_t* const mtx_;
public:
lock (pthread_mutex_t* mtx) : mtx_(mtx)
{
int err= pthread_mutex_lock (mtx_);
if (err)
{
WSREP_ERROR("Mutex lock failed: %s", strerror(err));
abort();
}
}
virtual ~lock ()
{
int err= pthread_mutex_unlock (mtx_);
if (err)
{
WSREP_ERROR("Mutex unlock failed: %s", strerror(err));
abort();
}
}
inline void wait (pthread_cond_t* cond)
{
pthread_cond_wait (cond, mtx_);
}
private:
lock (const lock&);
lock& operator=(const lock&);
};
class monitor
{
int mutable refcnt;
pthread_mutex_t mutable mtx;
pthread_cond_t mutable cond;
public:
monitor() : refcnt(0)
{
pthread_mutex_init (&mtx, NULL);
pthread_cond_init (&cond, NULL);
}
~monitor()
{
pthread_mutex_destroy (&mtx);
pthread_cond_destroy (&cond);
}
void enter() const
{
lock l(&mtx);
while (refcnt)
{
l.wait(&cond);
}
refcnt++;
}
void leave() const
{
lock l(&mtx);
refcnt--;
if (refcnt == 0)
{
pthread_cond_signal (&cond);
}
}
private:
monitor (const monitor&);
monitor& operator= (const monitor&);
};
class critical
{
const monitor& mon;
public:
critical(const monitor& m) : mon(m) { mon.enter(); }
~critical() { mon.leave(); }
private:
critical (const critical&);
critical& operator= (const critical&);
};
#endif
} // namespace wsrep
#endif /* WSREP_UTILS_H */