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/*
PowerDNS Versatile Database Driven Nameserver
Copyright (C) 2002 - 2009 PowerDNS.COM BV
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "utility.hh"
#include <cstring>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "ahuexception.hh"
#include "logger.hh"
#include "misc.hh"
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#ifdef NEED_INET_NTOP_PROTO
extern "C" {
const char *inet_ntop(int af, const void *src, char *dst, size_t cnt);
}
#endif
using namespace std;
// Closes a socket.
int Utility::closesocket( Utility::sock_t socket )
{
int ret=::close(socket);
if(ret < 0 && errno == ECONNRESET) // see ticket 192, odd BSD behaviour
return 0;
if(ret < 0)
throw AhuException("Error closing socket: "+stringerror());
return ret;
}
bool Utility::setNonBlocking(sock_t sock)
{
int flags=fcntl(sock,F_GETFL,0);
if(flags<0 || fcntl(sock, F_SETFL,flags|O_NONBLOCK) <0)
return false;
return true;
}
bool Utility::setBlocking(sock_t sock)
{
int flags=fcntl(sock,F_GETFL,0);
if(flags<0 || fcntl(sock, F_SETFL,flags&(~O_NONBLOCK)) <0)
return false;
return true;
}
const char *Utility::inet_ntop(int af, const char *src, char *dst, size_t size)
{
return ::inet_ntop(af,src,dst,size);
}
unsigned int Utility::sleep(unsigned int sec)
{
return ::sleep(sec);
}
void Utility::usleep(unsigned long usec)
{
::usleep(usec);
}
// Drops the program's privileges.
void Utility::dropPrivs( int uid, int gid )
{
if(gid) {
if(setgid(gid)<0) {
theL()<<Logger::Critical<<"Unable to set effective group id to "<<gid<<": "<<stringerror()<<endl;
exit(1);
}
else
theL()<<Logger::Info<<"Set effective group id to "<<gid<<endl;
}
if(uid) {
if(setuid(uid)<0) {
theL()<<Logger::Critical<<"Unable to set effective user id to "<<uid<<": "<<stringerror()<<endl;
exit(1);
}
else
theL()<<Logger::Info<<"Set effective user id to "<<uid<<endl;
}
}
// Returns the current process id.
Utility::pid_t Utility::getpid( void )
{
return ::getpid();
}
// Returns the current time.
int Utility::gettimeofday( struct timeval *tv, void *tz )
{
return ::gettimeofday(tv,0);
}
// Converts an address from dot and numbers format to binary data.
int Utility::inet_aton( const char *cp, struct in_addr *inp )
{
return ::inet_aton(cp,inp);
}
// Converts an address from presentation format to network format.
int Utility::inet_pton( int af, const char *src, void *dst )
{
return ::inet_pton(af, src, dst);
}
// Retrieves a gid using a groupname.
int Utility::makeGidNumeric(const string &group)
{
int newgid;
if(!(newgid=atoi(group.c_str()))) {
struct group *gr=getgrnam(group.c_str());
if(!gr) {
theL()<<Logger::Critical<<"Unable to look up gid of group '"<<group<<"': "<<strerror(errno)<<endl;
exit(1);
}
newgid=gr->gr_gid;
}
return newgid;
}
// Retrieves an uid using a username.
int Utility::makeUidNumeric(const string &username)
{
int newuid;
if(!(newuid=atoi(username.c_str()))) {
struct passwd *pw=getpwnam(username.c_str());
if(!pw) {
theL()<<Logger::Critical<<"Unable to look up uid of user '"<<username<<"': "<<strerror(errno)<<endl;
exit(1);
}
newuid=pw->pw_uid;
}
return newuid;
}
// Returns a random number.
long int Utility::random( void )
{
return rand();
}
// Sets the random seed.
void Utility::srandom( unsigned int seed )
{
::srandom(seed);
}
// Writes a vector.
int Utility::writev(int socket, const iovec *vector, size_t count )
{
return ::writev(socket,vector,count);
}
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