Kamailio - The Open Source SIP Server: ut.c Source File

00001 /*
00002  *$Id: ut.c 4891 2008-09-11 17:09:28Z henningw $
00003  *
00004  * - various general purpose functions
00005  *
00006  * Copyright (C) 2001-2003 FhG Fokus
00007  *
00008  * This file is part of Kamailio, a free SIP server.
00009  *
00010  * Kamailio is free software; you can redistribute it and/or modify
00011  * it under the terms of the GNU General Public License as published by
00012  * the Free Software Foundation; either version 2 of the License, or
00013  * (at your option) any later version
00014  *
00015  * Kamailio is distributed in the hope that it will be useful,
00016  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018  * GNU General Public License for more details.
00019  *
00020  * You should have received a copy of the GNU General Public License 
00021  * along with this program; if not, write to the Free Software 
00022  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00023  *
00024  * History
00025  * ------
00026  * 2006-09-25  created by movind user2uid and group2gid from main.c (bogdan)
00027  */
00028 
00029 /*!
00030  * \file
00031  * \brief Various utility functions, mostly related to string handling
00032  */
00033 
00034 
00035 #include <stdlib.h>
00036 #include <pwd.h>
00037 #include <grp.h>
00038 #include "ut.h"
00039 
00040 /*! buffer for int2str */
00041 char int2str_buf[INT2STR_MAX_LEN];
00042 
00043 
00044 /*!
00045  * \brief Converts a username into uid and gid values
00046  * \param uid user id
00047  * \param gid group id, set to null if you don't want this
00048  * \param user username
00049  * \return -1 on error, 0 on success
00050  */
00051 int user2uid(int* uid, int* gid, char* user)
00052 {
00053    char* tmp;
00054    struct passwd *pw_entry;
00055    
00056    if (user){
00057       *uid=strtol(user, &tmp, 10);
00058       if ((tmp==0) ||(*tmp)){
00059          /* maybe it's a string */
00060          pw_entry=getpwnam(user);
00061          if (pw_entry==0){
00062             goto error;
00063          }
00064          *uid=pw_entry->pw_uid;
00065          if (gid) *gid=pw_entry->pw_gid;
00066       }
00067       return 0;
00068    }
00069 error:
00070    return -1;
00071 }
00072 
00073 
00074 /*!
00075  * \brief Converts a groupname into gid value
00076  * \param gid group id
00077  * \param group group name
00078  * \return -1 on error, 0 on success
00079  */
00080 int group2gid(int* gid, char* group)
00081 {
00082    char* tmp;
00083    struct group  *gr_entry;
00084    
00085    if (group){
00086       *gid=strtol(group, &tmp, 10);
00087       if ((tmp==0) ||(*tmp)){
00088          /* maybe it's a string */
00089          gr_entry=getgrnam(group);
00090          if (gr_entry==0){
00091             goto error;
00092          }
00093          *gid=gr_entry->gr_gid;
00094       }
00095       return 0;
00096    }
00097 error:
00098    return -1;
00099 }
00100 
00101 /*! utility function to give each children a unique seed */
00102 void seed_child(unsigned int seed)
00103 {
00104    srand(seed);
00105 }