//==========================================================================
//
//      ./lib/current/src/system.c
//
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//####UCDSNMPCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from the UCD-SNMP
// project,  <http://ucd-snmp.ucdavis.edu/>  from the University of
// California at Davis, which was originally based on the Carnegie Mellon
// University SNMP implementation.  Portions of this software are therefore
// covered by the appropriate copyright disclaimers included herein.
//
// The release used was version 4.1.2 of May 2000.  "ucd-snmp-4.1.2"
// -------------------------------------------
//
//####UCDSNMPCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: hmt
// Date:         2000-05-30
// Purpose:      Port of UCD-SNMP distribution to eCos.
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
/********************************************************************
       Copyright 1989, 1991, 1992 by Carnegie Mellon University

			  Derivative Work -
Copyright 1996, 1998, 1999, 2000 The Regents of the University of California

			 All Rights Reserved

Permission to use, copy, modify and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appears in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU and The Regents of
the University of California not be used in advertising or publicity
pertaining to distribution of the software without specific written
permission.

CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL CMU OR
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*********************************************************************/
/*
 * system.c
 */
/***********************************************************
        Copyright 1992 by Carnegie Mellon University

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/
/*
 * System dependent routines go here
 */
#include <config.h>
#include <stdio.h>
#include <ctype.h>

#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif

#if TIME_WITH_SYS_TIME
# ifdef WIN32
#  include <sys/timeb.h>
# else
#  include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#include <sys/types.h>

#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif

#if HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif

#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_NLIST_H
#include <nlist.h>
#endif

#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif

#if HAVE_KSTAT_H
#include <kstat.h>
#endif

#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif

#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include "asn1.h"
#include "snmp_api.h"
#include "tools.h"
#include "system.h"
#include "snmp_logging.h"

#define NUM_NETWORKS    32   /* max number of interfaces to check */

#ifndef IFF_LOOPBACK
#	define IFF_LOOPBACK 0
#endif

#define LOOPBACK    0x7f000001



/* ********************************************* */
#ifdef							WIN32
#	define WIN32_LEAN_AND_MEAN
#	define WIN32IO_IS_STDIO
#	define PATHLEN	1024

#	include <tchar.h>
#	include <windows.h>


/* The idea here is to read all the directory names into a string table
 * (separated by nulls) and when one of the other dir functions is called
 * return the pointer to the current file name.
 */
DIR *
opendir(const char *filename)
{
    DIR            *p;
    long            len;
    long            idx;
    char            scannamespc[PATHLEN];
    char       *scanname = scannamespc;
    struct stat     sbuf;
    WIN32_FIND_DATA FindData;
    HANDLE          fh;

    /* check to see if filename is a directory */
    if (stat(filename, &sbuf) < 0 || sbuf.st_mode & S_IFDIR == 0) {
	return NULL;
    }

    /* get the file system characteristics */
/*  if(GetFullPathName(filename, SNMP_MAXPATH, root, &dummy)) {
 *	if(dummy = strchr(root, '\\'))
 *	    *++dummy = '\0';
 *	if(GetVolumeInformation(root, volname, SNMP_MAXPATH, &serial,
 *				&maxname, &flags, 0, 0)) {
 *	    downcase = !(flags & FS_CASE_IS_PRESERVED);
 *	}
 *  }
 *  else {
 *	downcase = TRUE;
 *  }
 */

    /* Create the search pattern */
    strcpy(scanname, filename);

    if(strchr("/\\", *(scanname + strlen(scanname) - 1)) == NULL)
	strcat(scanname, "/*");
    else
	strcat(scanname, "*");

    /* do the FindFirstFile call */
    fh = FindFirstFile(scanname, &FindData);
    if(fh == INVALID_HANDLE_VALUE) {
	return NULL;
    }

    /* Get us a DIR structure */
    p = (DIR*)malloc(sizeof(DIR));
    /* Newz(1303, p, 1, DIR); */
    if(p == NULL)
	return NULL;

    /* now allocate the first part of the string table for
     * the filenames that we find.
     */
    idx = strlen(FindData.cFileName)+1;
    p->start = (char*)malloc(idx);
    /* New(1304, p->start, idx, char);*/
    if(p->start == NULL) {
		free(p);
		return NULL;
    }
    strcpy(p->start, FindData.cFileName);
/*  if(downcase)
 *	strlwr(p->start);
 */
    p->nfiles = 0;

    /* loop finding all the files that match the wildcard
     * (which should be all of them in this directory!).
     * the variable idx should point one past the null terminator
     * of the previous string found.
     */
    while (FindNextFile(fh, &FindData)) {
	len = strlen(FindData.cFileName);
	/* bump the string table size by enough for the
	 * new name and it's null terminator
	 */
	p->start = (char*)realloc((void*)p->start, idx+len+1);
	/* Renew(p->start, idx+len+1, char);*/
	if(p->start == NULL) {
		free(p);
	    return NULL;
	}
	strcpy(&p->start[idx], FindData.cFileName);
/*	if (downcase) 
 *	    strlwr(&p->start[idx]);
 */
		p->nfiles++;
		idx += len+1;
	}
	FindClose(fh);
	p->size = idx;
	p->curr = p->start;
	return p;
}


/* Readdir just returns the current string pointer and bumps the
 * string pointer to the nDllExport entry.
 */
struct direct *
readdir(DIR *dirp)
{
    int         len;
    static int  dummy = 0;

    if (dirp->curr) {
	/* first set up the structure to return */
	len = strlen(dirp->curr);
	strcpy(dirp->dirstr.d_name, dirp->curr);
	dirp->dirstr.d_namlen = len;

	/* Fake an inode */
	dirp->dirstr.d_ino = dummy++;

	/* Now set up for the nDllExport call to readdir */
	dirp->curr += len + 1;
	if (dirp->curr >= (dirp->start + dirp->size)) {
	    dirp->curr = NULL;
	}

	return &(dirp->dirstr);
    } 
    else
	return NULL;
}

/* free the memory allocated by opendir */
int
closedir(DIR *dirp)
{
    free(dirp->start);
    free(dirp);
    return 1;
}

#ifndef HAVE_GETTIMEOFDAY

int gettimeofday(struct timeval *tv,
		 struct timezone *tz)
{
    struct _timeb timebuffer;

    _ftime(&timebuffer);
    tv->tv_usec = timebuffer.millitm * 1000;
    tv->tv_sec = timebuffer.time;
    return(0);
}
#endif	/* !HAVE_GETTIMEOFDAY */

in_addr_t get_myaddr(void)
{
  char local_host[130];
  int result;
  LPHOSTENT lpstHostent;
  SOCKADDR_IN in_addr, remote_in_addr;
  SOCKET hSock;
  int nAddrSize = sizeof(SOCKADDR);

  in_addr.sin_addr.s_addr = INADDR_ANY;

  result = gethostname(local_host, sizeof(local_host));
  if (result == 0)
  {
	lpstHostent = gethostbyname((LPSTR)local_host);
	if (lpstHostent)
	{
	  in_addr.sin_addr.s_addr = *((u_long FAR *) (lpstHostent->h_addr));
	  return((in_addr_t)in_addr.sin_addr.s_addr);
	}
  }

  /* if we are here, than we don't have host addr */
  hSock = socket(AF_INET, SOCK_DGRAM, 0);
  if (hSock != INVALID_SOCKET)
  {
	  /* connect to any port and address */
	  remote_in_addr.sin_family = AF_INET;
	  remote_in_addr.sin_port = htons(IPPORT_ECHO);
	  remote_in_addr.sin_addr.s_addr = inet_addr("128.22.33.11");
	  result=connect(hSock,(LPSOCKADDR)&remote_in_addr,sizeof(SOCKADDR)); 
	  if (result != SOCKET_ERROR)
	  {
	      /* get local ip address */
	      getsockname(hSock, (LPSOCKADDR)&in_addr,(int FAR *)&nAddrSize);
	  }
	  closesocket(hSock);
  }
  return((in_addr_t)in_addr.sin_addr.s_addr);
}

long get_uptime (void)
{
    return (0); /* not implemented */
}

char *
winsock_startup (void)
{
 WORD VersionRequested;
 WSADATA stWSAData;
 int i;
 static char errmsg[100];

 VersionRequested = MAKEWORD(1,1);
 i = WSAStartup(VersionRequested, &stWSAData); 
 if (i != 0)
 {
  if (i == WSAVERNOTSUPPORTED)
    sprintf(errmsg,"Unable to init. socket lib, does not support 1.1");
  else
  {
    sprintf(errmsg,"Socket Startup error %d", i);
  }
  return(errmsg);
 }
 return(NULL);
}

void winsock_cleanup (void)
{
   WSACleanup();
}

#else							/* ! WIN32 */
/*******************************************************************/

/*
 * XXX	What if we have multiple addresses?
 * XXX	Could it be computed once then cached?
 */
in_addr_t get_myaddr (void)
{
    int sd;
    struct ifconf ifc;
    struct ifreq conf[NUM_NETWORKS], *ifrp, ifreq;
    struct sockaddr_in *in_addr;
    int count;
    int interfaces;             /* number of interfaces returned by ioctl */

    if ((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
        return 0;
    ifc.ifc_len = sizeof(conf);
    ifc.ifc_buf = (caddr_t)conf;
    if (ioctl(sd, SIOCGIFCONF, (char *)&ifc) < 0){
        close(sd);
        return 0;
    }
    ifrp = ifc.ifc_req;
    interfaces = ifc.ifc_len / sizeof(struct ifreq);
    for(count = 0; count < interfaces; count++, ifrp++){
        ifreq = *ifrp;
        if (ioctl(sd, SIOCGIFFLAGS, (char *)&ifreq) < 0)
            continue;
        in_addr = (struct sockaddr_in *)&ifrp->ifr_addr;
        if ((ifreq.ifr_flags & IFF_UP)
#ifdef IFF_RUNNING
          && (ifreq.ifr_flags & IFF_RUNNING)
#endif /* IFF_RUNNING */
          && !(ifreq.ifr_flags & IFF_LOOPBACK)
          && in_addr->sin_addr.s_addr != LOOPBACK){
#ifdef SYS_IOCTL_H_HAS_SIOCGIFADDR
	    if (ioctl(sd, SIOCGIFADDR, (char *)&ifreq) < 0)
		continue;
	    in_addr = (struct sockaddr_in *)&(ifreq.ifr_addr);
#endif
	    close(sd);
	    return in_addr->sin_addr.s_addr;
	}
    }
    close(sd);
    return 0;
}


#if !defined(solaris2) && !defined(linux) && !defined(cygwin) && !defined(__ECOS)
/*
 * Returns boottime in centiseconds(!).
 *	Caches this for future use.
 */
long get_boottime (void)
{
    static long boottime_csecs = 0;
    struct timeval boottime;
#ifdef	CAN_USE_SYSCTL
    int	    mib[2];
    size_t  len;
#else
    int kmem;
    static struct nlist nl[] = {
#if !defined(hpux)
	    { (char*)"_boottime" },
#else
	    { (char*)"boottime" },
#endif
	    { (char*)"" }
	};
#endif


    if ( boottime_csecs != 0 )
	return( boottime_csecs );

#ifdef CAN_USE_SYSCTL
    mib[0] = CTL_KERN;
    mib[1] = KERN_BOOTTIME;

    len = sizeof(boottime);

    sysctl(mib, 2, &boottime, &len, NULL, NULL);
    boottime_csecs = (boottime.tv_sec * 100) + (boottime.tv_usec / 10000);
#else						/* CAN_USE_SYSCTL */
    if ((kmem = open("/dev/kmem", 0)) < 0)
	return 0;
    nlist(KERNEL_LOC, nl);
    if (nl[0].n_type == 0){
	close(kmem);
	return 0;
    }

    lseek(kmem, (long)nl[0].n_value, L_SET);
    read(kmem, &boottime, sizeof(boottime));
    close(kmem);
    boottime_csecs = (boottime.tv_sec * 100) + (boottime.tv_usec / 10000);
#endif						/* CAN_USE_SYSCTL */

    return( boottime_csecs );
}
#endif

/*
 * Returns uptime in centiseconds(!).
 */
#if !defined(__ECOS)
long get_uptime (void)
{
#if !defined(solaris2) && !defined(linux) && !defined(cygwin)
    struct timeval now;
    long boottime_csecs, nowtime_csecs;

    boottime_csecs = get_boottime();
    if (boottime_csecs == 0)
	return 0;
    gettimeofday(&now,(struct timezone *)0);
    nowtime_csecs = (now.tv_sec * 100) + (now.tv_usec / 10000);

    return (nowtime_csecs - boottime_csecs);
#endif

#ifdef solaris2
    kstat_ctl_t *ksc = kstat_open();
    kstat_t *ks;
    kid_t kid;
    kstat_named_t *named;
    u_long lbolt = 0;

    if (ksc) {
	ks = kstat_lookup (ksc, "unix", -1, "system_misc");
	if (ks) {
	    kid = kstat_read (ksc, ks, NULL);
	    if (kid != -1) {
		named = kstat_data_lookup(ks, "lbolt");
		if (named) {
		    lbolt = named->value.ul;
		}
	    }
	}
	kstat_close(ksc);
    }
    return lbolt;
#endif /* solaris2 */

#ifdef linux
   FILE *in = fopen ("/proc/uptime", "r");
   long uptim = 0, a, b;
   if (in) {
       if (2 == fscanf (in, "%ld.%ld", &a, &b))
	   uptim = a * 100 + b;
       fclose (in);
   }
   return uptim;
#endif /* linux */
   return (0); /* not implemented */
}
#endif // not __ECOS

#ifndef HAVE_GETTIMEOFDAY

int gettimeofday(struct timeval *tv,
		 struct timezone *tz)
{

    tv->tv_usec = 0;
    tv->tv_sec = time(NULL);
    return(0);
}
#endif	/* !HAVE_GETTIMEOFDAY */


#endif							/* ! WIN32 */
/*******************************************************************/

#ifndef HAVE_STRNCASECMP

/* test for NULL pointers before and NULL characters after
 * comparing possibly non-NULL strings.
 * WARNING: This function does NOT check for array overflow.
 */
int strncasecmp(const char *s1, const char *s2, size_t nch)
{
    size_t ii;
    int res = -1;

    if (!s1) {
        if (!s2)  return 0;
        return (-1);
    }
    if (!s2)
        return (1);

    for (ii = 0; (ii < nch) && *s1 && *s2; ii++, s1++, s2++)
    {
        res = (int) (tolower(*s1) - tolower(*s2));
        if (res != 0) break;
    }

    if ( ii == nch ) {
        s1--; s2--;
    }

    if (! *s1) {
        if (! *s2)  return 0;
        return (-1);
    }
    if (! *s2)
        return (1);

    return (res);
}

int strcasecmp(const char *s1, const char *s2)
{
    return strncasecmp(s1, s2, 1000000);
}

#endif /* HAVE_STRNCASECMP */


#ifndef HAVE_STRDUP
char *
strdup(const char *src)
{
    int len;
    char *dst;

    len = strlen(src) + 1;
    if ((dst = (char *)malloc(len)) == NULL)
	return(NULL);
    strcpy(dst, src);
    return(dst);
}
#endif	/* HAVE_STRDUP */

#ifndef HAVE_SETENV
int setenv(const char *name,
	   const char *value,
	   int overwrite)
{
    char *cp;
    int ret;

    if (overwrite == 0) {
	if (getenv(name)) return 0;
    }
    cp = (char*)malloc(strlen(name)+strlen(value)+2);
    if (cp == NULL) return -1;
    sprintf(cp, "%s=%s", name, value);
    ret = putenv(cp);
    return ret;
}
#endif /* HAVE_SETENV */

int
calculate_time_diff(struct timeval *now, struct timeval *then)
{
  struct timeval tmp, diff;
  memcpy(&tmp, now, sizeof(struct timeval));
  tmp.tv_sec--;
  tmp.tv_usec += 1000000L;
  diff.tv_sec = tmp.tv_sec - then->tv_sec;
  diff.tv_usec = tmp.tv_usec - then->tv_usec;
  if (diff.tv_usec > 1000000L){
    diff.tv_usec -= 1000000L;
    diff.tv_sec++;
  }
  return ((diff.tv_sec * 100) + (diff.tv_usec / 10000));
}

#ifndef HAVE_STRCASESTR
/*
 * only glibc2 has this.
 */
char *strcasestr(const char *haystack, const char *needle)
{
    const char *cp1=haystack, *cp2=needle;
    const char *cx;
    int tstch1, tstch2;

    /* printf("looking for '%s' in '%s'\n", needle, haystack); */
    if (cp1 && cp2 && *cp1 && *cp2)
        for (cp1=haystack, cp2=needle; *cp1; ) {
            cx = cp1; cp2 = needle;
            do {
                /* printf("T'%c' ", *cp1); */
                if (! *cp2) { /* found the needle */
                    /* printf("\nfound '%s' in '%s'\n", needle, cx); */
                    return (char *)cx;
                }
                if (! *cp1)
                    break;

                tstch1 = toupper(*cp1);
                tstch2 = toupper(*cp2);
                if (tstch1 != tstch2)
                    break;
                /* printf("M'%c' ", *cp1); */
                cp1++; cp2++;
            }
            while (1);
            if (*cp1)
                cp1++;
        }
    /* printf("\n"); */
    if (cp1 && *cp1)
        return (char *)cp1;

    return NULL;
}
#endif

#if !defined(__ECOS)
int
mkdirhier(const char *pathname, mode_t mode, int skiplast) {
    struct stat     sbuf;
    char *ourcopy = strdup(pathname);
    char *entry;
    char buf[SNMP_MAXPATH];

    entry = strtok( ourcopy, "/" );

    buf[0] = '\0';
    /* check to see if filename is a directory */
    while ( entry ) {
        strcat(buf,"/");
        strcat(buf, entry);
        entry = strtok( NULL, "/");
        if (entry == NULL && skiplast)
            break;
        if (stat(buf, &sbuf) < 0) {
            /* DNE, make it */
            snmp_log(LOG_INFO, "Creating directory: %s\n", buf);
#ifdef WIN32
	    CreateDirectory(buf, NULL);
#else
            mkdir(buf, mode);
#endif
        } else {
            /* exists, is it a file? */
            if ((sbuf.st_mode & S_IFDIR) == 0) {
                /* ack! can't make a directory on top of a file */
                free(ourcopy);
                return SNMPERR_GENERR;
            }
        }
    }
    free(ourcopy);
    return SNMPERR_SUCCESS;
}
#endif


#ifdef __ECOS
#include <cyg/kernel/kapi.h>

long get_boottime (void)
{
    return 1l;
}

long get_uptime (void)
{
    return cyg_current_time();
}

#endif