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netcfg-dhcp.c - Configure a network via dhcp for the debian-installer
Author - David Whedon
#include <ctype.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <debconfclient.h>
#include "utils.h"
#include "netcfg.h"
static char *interface = NULL;
static char *hostname = NULL;
static char *domain = NULL;
static u_int32_t ipaddress = 0;
static u_int32_t nameservers[4] = { 0 };
static struct debconfclient *client;
static char *dhcp_hostname = NULL;
char *
debconf_input (char *priority, char *template)
client->command (client, "fset", template, "seen", "false", NULL);
client->command (client, "input", priority, template, NULL);
client->command (client, "go", NULL);
client->command (client, "get", template, NULL);
return client->value;
static void
netcfg_get_dhcp ()
if (dhcp_hostname)
free (dhcp_hostname);
client->command (client, "input", "high", "netcfg/dhcp_hostname", NULL);
client->command (client, "go", NULL);
client->command (client, "get", "netcfg/dhcp_hostname", NULL);
if (client->value)
dhcp_hostname = strdup (client->value);
static void
netcfg_write_dhcp ()
FILE *fp;
if ((fp = file_open (INTERFACES_FILE)))
fprintf (fp,
"\n# This entry was created during the Debian installation\n");
fprintf (fp, "iface %s inet dhcp\n", interface);
netcfg_mkdir (DHCPCD_DIR);
if ((fp = file_open (DHCPCD_FILE)))
fprintf (fp,
"\n# dhcpcd configuration: created during the Debian installation\n");
fprintf (fp, "IFACE=%s\n", interface);
if (dhcp_hostname)
fprintf (fp, "OPTIONS='-h %s'\n", dhcp_hostname);
static void
netcfg_activate_dhcp ()
char buf[128];
char *ptr;
execlog ("/sbin/ifconfig lo");
ptr = buf;
ptr += snprintf (buf, sizeof (buf), "/sbin/dhcpcd-2.2.x");
if (dhcp_hostname)
ptr +=
snprintf (ptr, sizeof (buf) - (ptr - buf), " -h %s", dhcp_hostname);
ptr += snprintf (ptr, sizeof (buf) - (ptr - buf), " %s", interface);
if (execlog (buf))
netcfg_die (client);
main (int argc, char *argv[])
char *ptr;
int finished = 1;
client = debconfclient_new ();
client->command (client, "title", "DHCP Network Configuration", NULL);
netcfg_get_common (client, interface, hostname, domain, nameservers);
netcfg_get_dhcp ();
client->command (client, "subst", "netcfg/confirm_dhcp", "interface",
interface, NULL);
client->command (client, "subst", "netcfg/confirm_dhcp", "hostname",
hostname, NULL);
client->command (client, "subst", "netcfg/confirm_dhcp", "domain",
(domain ? domain : "<none>"), NULL);
client->command (client, "subst", "netcfg/confirm_dhcp",
(dhcp_hostname ? dhcp_hostname : "<none>"), NULL);
ptr = debconf_input ("medium", "netcfg/confirm_dhcp");
if (strstr (ptr, "true"))
finished = 1;
while (!finished);
netcfg_write_dhcp ();
netcfg_write_common (ipaddress, domain, hostname, nameservers);
debconf_input ("medium", "netcfg/do_dhcp");
netcfg_activate_dhcp ();
return 0;