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/*
INITIALIZE Program according to System Configuration
Revised for Version 0.7b
Copyright G. MacKay under the GNU GPL
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
FILE *fp;
extern char configfile[];
extern char ethdevname[];
/* static char fname[] = "rc.inet1"; */
static char buf[256];
static char temp[200];
void
convint2char (unsigned int hold[], unsigned char cbuf[])
{
int i;
for (i = 0; i < 4; i++)
cbuf[i] = (unsigned char) hold[i];
}
int
mkint (char asc)
{
int tmp;
if (isxdigit (asc))
{
tmp = asc - '0';
if (tmp > 9)
tmp = asc - 'A' + 10;
if (tmp > 15)
tmp = asc - 'a' + 10;
return (tmp);
}
else
return (0);
}
void
cvhextohost (char *hex, unsigned char *host)
{
int cvhi, cvlo;
host += 3;
cvhi = mkint (*hex);
hex++;
cvlo = mkint (*hex);
hex++;
*host = (cvhi) << 4 | cvlo;
host--;
cvhi = mkint (*hex);
hex++;
cvlo = mkint (*hex);
hex++;
*host = (cvhi) << 4 | cvlo;
host--;
cvhi = mkint (*hex);
hex++;
cvlo = mkint (*hex);
hex++;
*host = (cvhi) << 4 | cvlo;
host--;
cvhi = mkint (*hex);
hex++;
cvlo = mkint (*hex);
*host = 0;
*host = (cvhi) << 4 | cvlo;
}
void
processproc (FILE * fp, unsigned char *netmask, unsigned char *local, int *ok)
{
char buf[255];
int cnt = 0;
int num;
char devname[10], dest[20], gateway[20], flags[10], ref[10];
char met[10], use[10], mask[20], rest[80];
while (fgets (buf, 255, fp) != NULL)
{
if (cnt)
{
num = sscanf (buf, "%s %s %s %s %s %s %s %s %s",
devname, dest, gateway, flags, ref, met, use, mask,
rest);
if (!strcmp (ethdevname, devname))
{
if ((atoi (flags) & 1) == 1) /* Thanks Dave...! */
{
cvhextohost (dest, local);
cvhextohost (mask, netmask);
*ok = 1;
return;
}
}
}
cnt++;
}
}
/*
Change to check "/proc/net/route" first to get the
parameters from the ACTUAL system
If no /proc filesystem... use the rc.inet1 file
*/
void
processinetrc (unsigned char *netmask, unsigned char *local, int *ok)
{
unsigned int hold[4];
int ethere = 0;
int netmaskglobal = 0;
int ipglobal = 0;
int i;
char *tok;
int ipnext, netmasknext;
*ok = 0;
if ((fp = fopen ("/proc/net/route", "r")))
{
processproc (fp, netmask, local, ok);
fclose (fp);
return;
}
fp = fopen (configfile, "r");
if (fp == NULL)
{
return;
}
while (fgets (buf, 256, fp))
{
ethere = 0;
if (buf[0] == '#')
continue;
if (!strncmp (buf, "NETMASK=\"", 9))
{
sscanf (buf, "%[^=]=\"%u.%u.%u.%u\"", temp, &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, netmask);
netmaskglobal = 1;
}
else if (!strncmp (buf, "NETMASK=", 8))
{
sscanf (buf, "%[^=]=%u.%u.%u.%u", temp, &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, netmask);
netmaskglobal = 1;
}
if (!strncmp (buf, "IPADDR=\"", 8))
{
sscanf (buf, "%[^=]=\"%u.%u.%u.%u\"", temp, &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, local);
ipglobal = 1;
}
else if (!strncmp (buf, "IPADDR=", 7))
{
sscanf (buf, "%[^=]=%u.%u.%u.%u", temp, &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, local);
ipglobal = 1;
}
if (strstr (buf, ethdevname))
{
*ok = 1;
ethere = 1;
}
if (strstr (buf, "ifconfig"))
{
if (ethere)
{
/* PARSE the IFCONFIG line */
ipnext = 0;
netmasknext = 0;
tok = strtok (buf, " ");
i = 1;
do
{
if (ipnext)
{
if (*tok != '$') /* IPGLOBAL NOT USED */
{
if (*tok == '\"')
{
sscanf (tok + 1, "%u.%u.%u.%u", &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, local);
}
else
{
sscanf (tok, "%u.%u.%u.%u", &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, local);
}
}
ipnext = 0;
}
else if (netmasknext)
{
if (*tok != '$') /* NETMASK GLOBAL NOT USED */
{
if (*tok == '\"')
{
sscanf (tok + 1, "%u.%u.%u.%u", &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, netmask);
}
else
{
sscanf (tok, "%u.%u.%u.%u", &hold[0],
&hold[1], &hold[2], &hold[3]);
convint2char (hold, netmask);
}
}
netmasknext = 0;
}
else if (!strcmp (tok, ethdevname))
ipnext = 1;
else if (!strcmp (tok, "netmask"))
netmasknext = 1;
/* printf("%d=%s$\n",i,tok); */
i++;
}
while ((tok = strtok (NULL, " ")) != NULL);
}
}
}
fclose (fp);
return;
}
/* TEST PROGRAM FOR ROUTINE
char ethdevname[]="eth0";
char configfile[]="/etc/rc.d/rc.inet1";
int main()
{
int ok;
unsigned char mask[4];
unsigned char loc[4];
processinetrc(mask,loc,&ok);
printf("NETMASK=%d.%d.%d.%d\n",mask[0],mask[1],mask[2],mask[3]);
printf("IPADDR=%d.%d.%d.%d\n",loc[0],loc[1],loc[2],loc[3]);
return;
}
*/
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