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/*
netcfg.c - Shared functions used to configure the network for
the debian-installer.
Copyright (C) 2000-2002 David Kimdon <dwhedon@debian.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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
*/
#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 <cdebconf/debconfclient.h>
#include <debian-installer.h>
#include "netcfg.h"
static char *debconf_input(struct debconfclient *client, 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;
}
int is_interface_up(char *inter)
{
struct ifreq ifr;
int sfd = -1, ret = -1;
if ((sfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
goto int_up_done;
strncpy(ifr.ifr_name, inter, sizeof(ifr.ifr_name));
if (ioctl(sfd, SIOCGIFFLAGS, &ifr) < 0)
goto int_up_done;
ret = (ifr.ifr_flags & IFF_UP) ? 1 : 0;
int_up_done:
if (sfd != -1)
close(sfd);
return ret;
}
void get_name(char *name, char *p)
{
while (isspace(*p))
p++;
while (*p) {
if (isspace(*p))
break;
if (*p == ':') { /* could be an alias */
char *dot = p, *dotname = name;
*name++ = *p++;
while (isdigit(*p))
*name++ = *p++;
if (*p != ':') { /* it wasn't, backup */
p = dot;
name = dotname;
}
if (*p == '\0')
return;
p++;
break;
}
*name++ = *p++;
}
*name++ = '\0';
return;
}
static FILE *ifs = NULL;
static char ibuf[512];
void getif_start()
{
if (ifs != NULL) {
fclose(ifs);
ifs = NULL;
}
if ((ifs = fopen("/proc/net/dev", "r")) != NULL) {
fgets(ibuf, sizeof(ibuf), ifs); /* eat header */
fgets(ibuf, sizeof(ibuf), ifs); /* ditto */
}
return;
}
char *getif(int all)
{
char rbuf[512];
if (ifs == NULL)
return NULL;
if (fgets(rbuf, sizeof(rbuf), ifs) != NULL) {
get_name(ibuf, rbuf);
if (!strcmp(ibuf, "lo")) /* ignore the loopback */
return getif(all); /* seriously doubt there is an infinite number of lo devices */
if (all || is_interface_up(ibuf) == 1)
return ibuf;
}
return NULL;
}
void getif_end()
{
if (ifs != NULL) {
fclose(ifs);
ifs = NULL;
}
return;
}
char *get_ifdsc(const char *ifp)
{
int i;
struct if_alist_struct {
char *interface;
char *description;
} interface_alist[] = {
{
"eth", "Ethernet or Fast Ethernet"}
, {
"pcmcia", "PC-Card (PCMCIA) Ethernet or Token Ring"}
, {
"tr", "Token Ring"}
, {
"arc", "Arcnet"}
, {
"slip", "Serial-line IP"}
, {
"plip", "Parallel-line IP"}
, {
NULL, NULL}
};
for (i = 0; interface_alist[i].interface != NULL; i++)
if (!strncmp(ifp, interface_alist[i].interface,
strlen(interface_alist[i].interface)))
return interface_alist[i].description;
return "unknown interface";
}
FILE *file_open(char *path)
{
FILE *fp;
if ((fp = fopen(path, "w")))
return fp;
else {
fprintf(stderr, "%s\n", path);
perror("fopen");
return NULL;
}
}
void dot2num(u_int32_t * num, char *dot)
{
char *p = dot - 1;
char *e;
int ix;
unsigned long val;
if (!dot)
goto exit;
*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)
goto exit;
*num += val;
/*printf("%#8x, %#2x\n", *num, val); */
if (ix < 3 && *e != '.')
goto exit;
p = e;
}
return;
exit:
*num = 0;
}
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;
}
void netcfg_die(struct debconfclient *client)
{
client->command(client, "input", "high", "netcfg/error", NULL);
client->command(client, "go", NULL);
exit(1);
}
static void
netcfg_get_interface(struct debconfclient *client, char **interface)
{
char *inter;
int len;
int newchars;
char *ptr;
int num_interfaces = 0;
if (*interface) {
free(*interface);
*interface = NULL;
}
if (!(ptr = malloc(128)))
netcfg_die(client);
len = 128;
*ptr = '\0';
getif_start();
while ((inter = getif(1)) != NULL) {
newchars = strlen(inter) + strlen(get_ifdsc(inter)) + 5;
if (len < (strlen(ptr) + newchars)) {
if (!(ptr = realloc(ptr, len + newchars + 128)))
goto error;
len += newchars + 128;
}
di_snprintfcat(ptr, len, "%s: %s, ", inter,
get_ifdsc(inter));
num_interfaces++;
}
getif_end();
if (num_interfaces == 0) {
client->command(client, "input", "high",
"netcfg/no_interfaces", NULL);
client->command(client, "go", NULL);
free(ptr);
exit(1);
} else if (num_interfaces > 1) {
client->command(client, "subst", "netcfg/choose_interface",
"ifchoices", ptr, NULL);
free(ptr);
inter =
debconf_input(client, "high",
"netcfg/choose_interface");
if (!inter)
netcfg_die(client);
} else if (num_interfaces == 1)
inter = ptr;
/* grab just the interface name, not the description too */
*interface = inter;
ptr = strchr(inter, ':');
if (ptr == NULL)
goto error;
*ptr = '\0';
*interface = strdup(*interface);
return;
error:
if (ptr)
free(ptr);
netcfg_die(client);
}
void
netcfg_get_common(struct debconfclient *client, char **interface,
char **hostname, char **domain, char **nameservers)
{
char *ptr;
static const char *valid_chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
size_t len;
netcfg_get_interface(client, interface);
do {
free(*hostname);
*hostname =
strdup(debconf_input
(client, "medium", "netcfg/get_hostname"));
len = strlen(*hostname);
/* Check the hostname for RFC 1123 compliance. */
if ((len < 2) ||
(len > 63) ||
(strspn(*hostname, valid_chars) != len) ||
((*hostname)[len - 1] == '-') ||
((*hostname)[0] == '-')) {
client->command(client, "subst", "netcfg/invalid_hostname",
"hostname", *hostname, NULL);
client->command(client, "input", "high",
"netcfg/invalid_hostname", NULL);
client->command(client, "go", NULL);
free(*hostname);
*hostname = NULL;
client->command(client, "set",
"netcfg/get_hostname", "debian");
}
} while (!*hostname);
free(*domain);
*domain = NULL;
if ((ptr = debconf_input(client, "medium", "netcfg/get_domain")))
*domain = strdup(ptr);
free(*nameservers);
*nameservers = NULL;
if ((ptr =
debconf_input(client, "medium", "netcfg/get_nameservers")))
*nameservers = strdup(ptr);
}
void netcfg_nameservers_to_array(char *nameservers, u_int32_t array[])
{
char *save, *ptr, *ns;
if (nameservers) {
save = ptr = strdup(nameservers);
ns = strtok_r(ptr, " \n\t", &ptr);
dot2num(&array[0], ns);
ns = strtok_r(NULL, " \n\t", &ptr);
dot2num(&array[1], ns);
ns = strtok_r(NULL, " \n\t", &ptr);
dot2num(&array[2], ns);
array[3] = 0;
free(save);
} else
array[0] = 0;
}
void
netcfg_write_common(u_int32_t ipaddress, char *domain, char *hostname,
u_int32_t nameservers[])
{
FILE *fp;
if ((fp = file_open(HOSTS_FILE))) {
fprintf(fp, "127.0.0.1\tlocalhost\n");
if (ipaddress) {
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(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);
}
}