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/*
netcfg.c - Configure the network for the debian-installer
Author - David Whedon
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <debconfclient.h>
static char *hostname = NULL;
static char *domain = NULL;
static char *iface = "eth0";
static u_int32_t ipaddress = 0;
static u_int32_t network = 0;
static u_int32_t broadcast = 0;
static u_int32_t netmask = 0;
static u_int32_t gateway = 0;
static u_int32_t nameservers[4] = { 0 };
static struct debconfclient *client;
#define MAXLINE 128
static char cmd_buf[MAXLINE];
#define INTERFACES_FILE "etc/network/interfaces"
#define HOSTS_FILE "etc/hosts"
#define NETWORKS_FILE "etc/networks"
#define RESOLV_FILE "etc/resolv.conf"
/**
* dot2num and num2dot
* Copyright: Karl Hammar, Asp Data
*/
char *
dot2num (u_int32_t * num, char *dot)
{
char *p = dot - 1;
char *e;
int ix;
unsigned long val;
if (!dot)
return NULL;
*num = 0;
for (ix = 0; ix < 4; ix++)
{
*num <<= 8;
p++;
val = strtoul (p, &e, 10);
if (e == p)
val = 0;
else if (val > 255)
return NULL;
*num += val;
/*printf("%#8x, %#2x\n", *num, val); */
if (ix < 3 && *e != '.')
return NULL;
p = e;
}
return p;
}
static char num2dot_buf[16];
char *
num2dot (u_int32_t num)
{
int byte[4];
int ix;
char *dot = num2dot_buf;
for (ix = 3; ix >= 0; ix--)
{
byte[ix] = num & 0xff;
num >>= 8;
}
sprintf (dot, "%d.%d.%d.%d", byte[0], byte[1], byte[2], byte[3]);
return dot;
}
char *
debconf_input (char *priority, char *template)
{
client->command (client, "input", priority, template, NULL);
client->command (client, "go", NULL);
client->command (client, "get", template, NULL);
return client->value;
}
void
debconf_subst (char *template, char *key, char *string){
client->command (client, "subst", "netcfg/confirm_static_cfg",
key, string, NULL);
}
void
debconf_unseen(char *template){
client->command (client, "fset", template, "seen",
"false", NULL);
}
void
get_static_cfg (void)
{
int finished = 0;
char *ptr, *ns1, *ns2, *ns3;
do
{
hostname = strdup (debconf_input ("high", "netcfg/get_hostname"));
debconf_subst("netcfg/confirm_static_cfg", "hostname", hostname);
if ((ptr = debconf_input ("high", "netcfg/get_domain")))
{
domain = strdup (ptr);
debconf_subst("netcfg/confirm_static_cfg", "domain", domain);
}
if ((ptr = debconf_input ("high", "netcfg/get_ipaddress")))
{
dot2num (&ipaddress, ptr);
debconf_subst("netcfg/confirm_static_cfg", "ipaddress", ptr);
}
if ((ptr = debconf_input ("high", "netcfg/get_netmask")))
{
dot2num (&netmask, ptr);
debconf_subst("netcfg/confirm_static_cfg", "netmask", ptr);
}
network = ipaddress & netmask;
debconf_subst ("netcfg/confirm_static_cfg", "network", num2dot (network));
if (( ptr = debconf_input ("high", "netcfg/get_gateway")))
{
dot2num (&gateway, ptr);
debconf_subst("netcfg/confirm_static_cfg", "gateway", ptr);
}
if ((gateway & netmask) != (ipaddress & netmask))
{
client->command (client, "input", "high", "netcfg/gateway_unreachable", NULL);
client->command (client, "go", NULL);
}
broadcast = (network | ~netmask);
debconf_subst("netcfg/confirm_static_cfg", "broadcast", num2dot(broadcast));
ptr = debconf_input ("high", "netcfg/get_nameservers");
if (ptr)
{
ptr = strdup (ptr);
ns1 = strtok (ptr, " ");
ns2 = strtok (NULL, " ");
ns3 = strtok (NULL, " ");
if (ns1 != NULL)
debconf_subst("netcfg/confirm_static_cfg", "primary_DNS", ns1);
else
debconf_subst("netcfg/confirm_static_cfg", "primary_DNS", "none");
if (ns2 != NULL)
debconf_subst("netcfg/confirm_static_cfg", "secondary_DNS", ns1);
else
debconf_subst("netcfg/confirm_static_cfg", "secondary_DNS", "none");
if (ns3 != NULL)
debconf_subst("netcfg/confirm_static_cfg", "tertiary_DNS", ns1);
else
debconf_subst("netcfg/confirm_static_cfg", "tertiary_DNS", "none");
free (ptr);
}
ptr = debconf_input ("high", "netcfg/confirm_static_cfg");
if (strstr (ptr, "true"))
finished = 1;
else
{
debconf_unseen ("netcfg/get_hostname");
debconf_unseen ("netcfg/get_ipaddress");
debconf_unseen ("netcfg/get_netmask");
debconf_unseen ("netcfg/get_gateway");
debconf_unseen ("netcfg/get_nameservers");
debconf_unseen ("netcfg/get_confirm_static_cfg");
free (hostname);
free (domain);
hostname = domain = NULL;
ipaddress = network = broadcast = netmask = gateway = nameservers[0] = 0 ;
}
}
while (!finished);
}
FILE *
file_open(char *path){
FILE *fp;
if (( fp = fopen(path, "w")))
return fp;
else
{
perror("fopen");
return NULL;
}
}
void
write_static_cfg (void)
{
FILE *fp;
if ((fp = file_open (HOSTS_FILE)))
{
fprintf (fp, "127.0.0.1\tlocalhost\n");
if (domain)
{
fprintf (fp, "%s\t%s.%s\t%s\n", num2dot (ipaddress),
hostname, domain, hostname);
}
else
{
fprintf (fp, "%s\t%s\n", num2dot (ipaddress), hostname);
}
fclose (fp);
}
if ((fp = file_open (NETWORKS_FILE)))
{
fprintf (fp, "localnet %s\n", num2dot (network));
fclose (fp);
}
if ((fp = file_open (RESOLV_FILE)))
{
int i = 0;
if (domain)
fprintf (fp, "search %s\n", domain);
while (nameservers[i])
{
fprintf (fp, "nameserver %s\n", num2dot (nameservers[i++]));
}
fclose (fp);
}
if ((fp = file_open (INTERFACES_FILE)))
{
fprintf (fp,
"\n# The first network card - this entry was created during the Debian installation\n");
fprintf (fp, "# (network, broadcast and gateway are optional)\n");
fprintf (fp, "iface eth0 inet static\n");
fprintf (fp, "\taddress %s\n", num2dot (ipaddress));
fprintf (fp, "\tnetmask %s\n", num2dot (netmask));
fprintf (fp, "\tnetwork %s\n", num2dot (network));
fprintf (fp, "\tbroadcast %s\n", num2dot (broadcast));
fprintf (fp, "\tgateway %s\n", num2dot (gateway));
fclose (fp);
}
}
int
activate_static_net ()
{
system ("/sbin/ifconfig lo 127.0.0.1");
snprintf (cmd_buf, sizeof (cmd_buf),
"/sbin/ifconfig %s %s netmask %s broadcast %s", iface,
num2dot (ipaddress), num2dot (netmask), num2dot (broadcast));
system ("cmd_buf");
return 0;
}
int
main (int argc, char *argv[])
{
client = debconfclient_new ();
client->command (client, "title", "Network Configuration", NULL);
get_static_cfg ();
write_static_cfg ();
return 0;
}