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/*
 * Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
 * This file is part of SIGAR.
 * 
 * SIGAR is free software; you can redistribute it and/or modify
 * it under the terms version 2 of the GNU General Public License 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

/* Utility functions to provide string formatting of SIGAR data */

#include "sigar.h"
#include "sigar_private.h"
#include "sigar_util.h"
#include "sigar_os.h"
#include "sigar_format.h"

#include <errno.h>
#include <stdio.h>

#ifndef WIN32
#include <netinet/in.h>
#include <arpa/inet.h>
#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(_AIX)
#include <sys/socket.h>
#endif
#include <pwd.h>
#include <grp.h>

/* sysconf(_SC_GET{PW,GR}_R_SIZE_MAX) */
#define R_SIZE_MAX 1024

int sigar_user_name_get(sigar_t *sigar, int uid, char *buf, int buflen)
{
    struct passwd *pw = NULL;
    /* XXX cache lookup */

# ifdef HAVE_GETPWUID_R
    struct passwd pwbuf;
    char buffer[R_SIZE_MAX];

    if (getpwuid_r(uid, &pwbuf, buffer, sizeof(buffer), &pw) != 0) {
        return errno;
    }
    if (!pw) {
        return ENOENT;
    }
# else
    if ((pw = getpwuid(uid)) == NULL) {
        return errno;
    }
# endif

    strncpy(buf, pw->pw_name, buflen);
    buf[buflen-1] = '\0';

    return SIGAR_OK;
}

int sigar_group_name_get(sigar_t *sigar, int gid, char *buf, int buflen)
{
    struct group *gr;
    /* XXX cache lookup */

# ifdef HAVE_GETGRGID_R
    struct group grbuf;
    char buffer[R_SIZE_MAX];

    if (getgrgid_r(gid, &grbuf, buffer, sizeof(buffer), &gr) != 0) {
        return errno;
    }
# else
    if ((gr = getgrgid(gid)) == NULL) {
        return errno;
    }
# endif

    if (gr && gr->gr_name) {
        strncpy(buf, gr->gr_name, buflen);
    }
    else {
        /* seen on linux.. apache httpd.conf has:
         * Group #-1
         * results in uid == -1 and gr == NULL.
         * wtf getgrgid_r doesnt fail instead? 
         */
        sprintf(buf, "%d", gid);
    }
    buf[buflen-1] = '\0';

    return SIGAR_OK;
}

int sigar_user_id_get(sigar_t *sigar, const char *name, int *uid)
{
    /* XXX cache lookup */
    struct passwd *pw;

# ifdef HAVE_GETPWNAM_R
    struct passwd pwbuf;
    char buf[R_SIZE_MAX];

    if (getpwnam_r(name, &pwbuf, buf, sizeof(buf), &pw) != 0) {
        return errno;
    }
# else
    if (!(pw = getpwnam(name))) {
        return errno;
    }