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/* Static network configurator module for netcfg.
*
* Licensed under the terms of the GNU General Public License
*/
#include "netcfg.h"
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <debian-installer.h>
#include <assert.h>
static int netcfg_get_ipaddress(struct debconfclient *client, struct netcfg_interface *interface)
{
int ret, ok = 0;
while (!ok) {
debconf_input (client, "critical", "netcfg/get_ipaddress");
ret = debconf_go (client);
if (ret)
return ret;
debconf_get(client, "netcfg/get_ipaddress");
ok = netcfg_parse_cidr_address(client->value, interface);
if (!ok) {
debconf_capb(client);
debconf_input (client, "critical", "netcfg/bad_ipaddress");
debconf_capb(client, "backup");
debconf_go (client);
}
}
return 0;
}
static int netcfg_get_pointopoint(struct debconfclient *client, struct netcfg_interface *interface)
{
int ret, ok = 0;
union inX_addr addr;
char *ptr;
while (!ok) {
debconf_input(client, "critical", "netcfg/get_pointopoint");
ret = debconf_go(client);
if (ret)
return ret;
debconf_get(client, "netcfg/get_pointopoint");
ptr = strtrim(client->value);
if (empty_str(ptr)) { /* No P-P is ok */
interface->pointopoint[0] = '\0';
return 0;
}
ok = inet_pton (interface->address_family, ptr, &addr);
if (!ok) {
debconf_capb(client);
debconf_input (client, "critical", "netcfg/bad_ipaddress");
debconf_go (client);
debconf_capb(client, "backup");
}
}
inet_ntop(interface->address_family, &addr, interface->pointopoint, NETCFG_ADDRSTRLEN);
return 0;
}
static int netcfg_get_netmask(struct debconfclient *client, struct netcfg_interface *interface)
{
int ret, ok = 0;
union inX_addr addr;
char *ptr;
/* Preseed a vaguely sensible looking default netmask if one wasn't
* provided.
*/
debconf_get (client, "netcfg/get_netmask");
ptr = strtrim(client->value);
if (empty_str(ptr)) {
if (interface->address_family == AF_INET) {
debconf_set(client, "netcfg/get_netmask", "255.255.255.0");
} else if (interface->address_family == AF_INET6) {
debconf_set(client, "netcfg/get_netmask", "ffff:ffff:ffff:ffff::");
}
}
while (!ok) {
debconf_input (client, "critical", "netcfg/get_netmask");
ret = debconf_go(client);
if (ret)
return ret;
debconf_get (client, "netcfg/get_netmask");
ptr = strtrim(client->value);
ok = inet_pton (interface->address_family, ptr, &addr);
if (!ok) {
debconf_capb(client);
debconf_input (client, "critical", "netcfg/bad_ipaddress");
debconf_go (client);
debconf_capb(client, "backup");
}
}
inet_ptom(interface->address_family, ptr, &(interface->masklen));
return 0;
}
static void netcfg_preseed_gateway(struct debconfclient *client,
struct netcfg_interface *iface)
{
char ptr1[NETCFG_ADDRSTRLEN];
union inX_addr gw_addr, ipaddr, mask;
inet_pton(iface->address_family, iface->ipaddress, &ipaddr);
inet_mton(iface->address_family, iface->masklen, &mask);
/* Calculate a potentially-sensible 'default' default gateway,
* based on 'the first IP in the subnet' */
if (iface->address_family == AF_INET) {
gw_addr.in4.s_addr = ipaddr.in4.s_addr & mask.in4.s_addr;
gw_addr.in4.s_addr |= htonl(1);
} else if (iface->address_family == AF_INET6) {
int i;
for (i = 0; i < 4; i++) {
gw_addr.in6.s6_addr32[i] = ipaddr.in6.s6_addr32[i] & mask.in6.s6_addr32[i];
}
gw_addr.in6.s6_addr32[3] |= htonl(1);
}
inet_ntop (iface->address_family, &gw_addr, ptr1, NETCFG_ADDRSTRLEN);
/* if your chosen static IP address happens to be what we calculated for
* the 'default' gateway, obviously that isn't going to work, so stop
* guessing, just chop off the last octet, and let the user fill in the blank.
*
* This won't *quite* work with anything shorter than a /24; such is life.
*/
if (!strcmp(iface->ipaddress, ptr1)) {
char *ptr = strrchr(ptr1, iface->address_family == AF_INET6 ? ':' : '.');
assert (ptr); /* if there's no separator in ptr1 we're in deep shit */
ptr[1] = '\0';
}
debconf_get(client, "netcfg/get_gateway");
if (empty_str(client->value))
debconf_set(client, "netcfg/get_gateway", ptr1);
}
static int netcfg_get_gateway(struct debconfclient *client, struct netcfg_interface *interface)
{
union inX_addr gw_addr;
int ret, ok = 0;
char *ptr;
while (!ok) {
debconf_input (client, "critical", "netcfg/get_gateway");
ret = debconf_go(client);
if (ret)
return ret;
debconf_get(client, "netcfg/get_gateway");
ptr = strtrim(client->value);
if (empty_str(ptr) || /* No gateway, that's fine */
(strcmp(ptr, "none") == 0)) /* special case for preseeding */ {
/* clear existing gateway setting */
interface->gateway[0] = '\0';
return 0;
}
ok = inet_pton (interface->address_family, ptr, &gw_addr);
if (!ok) {
debconf_capb(client);
debconf_input (client, "critical", "netcfg/bad_ipaddress");
debconf_go (client);
debconf_capb(client, "backup");
} else {
/* Double conversion to ensure that the address is in a normalised,
* more readable form, in case the user entered something weird
* looking.
*/
inet_ntop(interface->address_family, &gw_addr, interface->gateway, NETCFG_ADDRSTRLEN);
}
}
return 0;
}
static int netcfg_write_etc_networks(char *network)
{
FILE *fp;
if ((fp = file_open(NETWORKS_FILE, "w"))) {
fprintf(fp, "default\t\t0.0.0.0\n");
fprintf(fp, "loopback\t127.0.0.0\n");
fprintf(fp, "link-local\t169.254.0.0\n");
if (network) {
fprintf(fp, "localnet\t%s\n", network);
}
fclose(fp);
return 1;
} else {
return 0;
}
}
static int netcfg_write_resolvconf_options(const char *domain,
const struct netcfg_interface *interface
)
{
FILE *fp;
if (!(fp = file_open(INTERFACES_FILE, "a"))) {
return 0;
}
/*
* Write resolvconf options
*
* This is useful for users who intend to install resolvconf
* after the initial installation.
*
* This code should be kept in sync with the code that writes
* this information to the /etc/resolv.conf file. If netcfg
* becomes capable of configuring multiple network interfaces
* then the user should be asked for dns information on a
* per-interface basis so that per-interface dns options
* can be written here.
*/
if (!empty_str(interface->nameservers[0]) || (domain && !empty_str(domain))) {
unsigned int i = 0;
fprintf(fp, "\t# dns-* options are implemented by the resolvconf package, if installed\n");
if (!empty_str(interface->nameservers[0])) {
fprintf(fp, "\tdns-nameservers");
for (i = 0; i < NETCFG_NAMESERVERS_MAX; i++) {
if (!empty_str(interface->nameservers[i])) {
fprintf(fp, " %s", interface->nameservers[i]);
}
}
fprintf(fp, "\n");
}
if (domain && !empty_str(domain))
fprintf(fp, "\tdns-search %s\n", domain);
}
fclose(fp);
return 1;
}
int netcfg_write_resolv (const char *domain, const struct netcfg_interface *interface)
{
FILE* fp = NULL;
if ((fp = file_open(RESOLV_FILE, "w"))) {
unsigned int i = 0;
if (domain && !empty_str(domain))
fprintf(fp, "search %s\n", domain);
for (i = 0; i < NETCFG_NAMESERVERS_MAX; i++)
if (!empty_str(interface->nameservers[i]))
fprintf(fp, "nameserver %s\n", interface->nameservers[i]);
fclose(fp);
return 1;
}
else
return 0;
}
static int netcfg_activate_static_ipv4(struct debconfclient *client,
const struct netcfg_interface *interface)
{
int rv = 0;
char buf[256];
char network[INET_ADDRSTRLEN];
char broadcast[INET_ADDRSTRLEN];
char netmask[INET_ADDRSTRLEN];
netcfg_network_address(interface, network);
netcfg_broadcast_address(interface, broadcast);
inet_mtop(AF_INET, interface->masklen, netmask, INET_ADDRSTRLEN);
#ifdef __GNU__
snprintf(buf, sizeof(buf),
"settrans -fgap /servers/socket/2 /hurd/pfinet --interface=%s --address=%s",
interface->name, interface->ipaddress);
di_snprintfcat(buf, sizeof(buf), " --netmask=%s", netmask);
if (!empty_str(interface->gateway))
di_snprintfcat(buf, sizeof(buf), " --gateway=%s", interface->gateway);
buf[sizeof(buf) - 1] = '\0';
/* NB: unfortunately we cannot use di_exec_shell_log() here, as the active
* translator would capture its pipe and make it hang forever. */
rv |= di_exec_shell(buf);
#elif defined(__FreeBSD_kernel__)
deconfigure_network(NULL);
loop_setup();
interface_up(interface->name);
/* Flush all previous addresses, routes */
snprintf(buf, sizeof(buf), "ifconfig %s inet 0 down", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ifconfig %s up", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ifconfig %s %s",
interface->name, interface->ipaddress);
/* avoid using a second buffer */
di_snprintfcat(buf, sizeof(buf), " netmask %s",
empty_str(interface->pointopoint) ? netmask : "255.255.255.255");
/* avoid using a third buffer */
di_snprintfcat(buf, sizeof(buf), " broadcast %s", broadcast);
di_info("executing: %s", buf);
rv |= di_exec_shell_log(buf);
if (!empty_str(interface->pointopoint)) {
snprintf(buf, sizeof(buf), "route add %s", interface->pointopoint);
/* avoid using a second buffer */
di_snprintfcat(buf, sizeof(buf), "%s", interface->ipaddress);
rv |= di_exec_shell_log(buf);
} else if (!empty_str(interface->gateway)) {
snprintf(buf, sizeof(buf), "route add default %s", interface->gateway);
rv |= di_exec_shell_log(buf);
}
#else
deconfigure_network(NULL);
loop_setup();
interface_up(interface->name);
/* Flush all previous addresses, routes */
snprintf(buf, sizeof(buf), "ip -f inet addr flush dev %s", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ip -f inet route flush dev %s", interface->name);
rv |= di_exec_shell_log(buf);
/* Add the new IP address, P-t-P peer (if necessary) and netmask */
snprintf(buf, sizeof(buf), "ip addr add %s/%d ", interface->ipaddress, interface->masklen);
/* avoid using a second buffer */
di_snprintfcat(buf, sizeof(buf), "broadcast %s dev %s", broadcast, interface->name);
if (!empty_str(interface->pointopoint))
di_snprintfcat(buf, sizeof(buf), " peer %s", interface->pointopoint);
di_info("executing: %s", buf);
rv |= di_exec_shell_log(buf);
if (!empty_str(interface->pointopoint))
{
snprintf(buf, sizeof(buf), "ip route add default dev %s", interface->name);
rv |= di_exec_shell_log(buf);
}
else if (!empty_str(interface->gateway)) {
snprintf(buf, sizeof(buf), "ip route add default via %s", interface->gateway);
rv |= di_exec_shell_log(buf);
}
#endif
if (rv != 0) {
debconf_capb(client);
debconf_input(client, "high", "netcfg/error");
debconf_go(client);
debconf_capb(client, "backup");
return -1;
}
return 0;
}
static int netcfg_activate_static_ipv6(struct debconfclient *client,
const struct netcfg_interface *interface)
{
int rv = 0;
char buf[1024];
#ifdef __GNU__
snprintf(buf, sizeof(buf),
"settrans -fgap /servers/socket/2 /hurd/pfinet --interface=%s -A %s/%i",
interface->name, interface->ipaddress, interface->masklen);
if (!empty_str(interface->gateway))
di_snprintfcat(buf, sizeof(buf), " -G %s", interface->gateway);
buf[sizeof(buf) - 1] = '\0';
/* NB: unfortunately we cannot use di_exec_shell_log() here, as the active
* translator would capture its pipe and make it hang forever. */
rv |= di_exec_shell(buf);
/* Apparently you need to setup the same thing on two separate sockets
* if you're doing IPv6. No wonder nobody uses Hurd.
*/
snprintf(buf, sizeof(buf),
"settrans -fgap /servers/socket/26 /hurd/pfinet --interface=%s -A %s/%i",
interface->name, interface->ipaddress, interface->masklen);
if (!empty_str(interface->gateway))
di_snprintfcat(buf, sizeof(buf), " -G %s", interface->gateway);
buf[sizeof(buf) - 1] = '\0';
rv |= di_exec_shell(buf);
#elif defined(__FreeBSD_kernel__)
deconfigure_network(NULL);
loop_setup();
interface_up(interface->name);
/* Flush all previous addresses, routes */
snprintf(buf, sizeof(buf), "ifconfig %s inet 0 down", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ifconfig %s up", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ifconfig %s inet6 %s prefixlen %i",
interface->name, interface->ipaddress, interface->masklen);
di_info("executing: %s", buf);
rv |= di_exec_shell_log(buf);
if (!empty_str(interface->gateway)) {
snprintf(buf, sizeof(buf), "/lib/freebsd/route add -inet6 default %s", interface->gateway);
rv |= di_exec_shell_log(buf);
}
#else
deconfigure_network(NULL);
loop_setup();
interface_up(interface->name);
/* Flush all previous addresses, routes */
snprintf(buf, sizeof(buf), "ip -f inet6 addr flush dev %s", interface->name);
rv |= di_exec_shell_log(buf);
snprintf(buf, sizeof(buf), "ip -f inet6 route flush dev %s", interface->name);
rv |= di_exec_shell_log(buf);
/* Now down and up the interface, to get LL and SLAAC addresses back,
* since flushing the addresses and routes gets rid of all that
* sort of thing. */
interface_down(interface->name);
interface_up(interface->name);
/* Add the new IP address and netmask */
snprintf(buf, sizeof(buf), "ip addr add %s/%d dev %s",
interface->ipaddress,
interface->masklen,
interface->name);
di_info("executing: %s", buf);
rv |= di_exec_shell_log(buf);
if (!empty_str(interface->gateway)) {
snprintf(buf, sizeof(buf), "ip route add default via %s", interface->gateway);
rv |= di_exec_shell_log(buf);
}
#endif
if (rv != 0) {
debconf_capb(client);
debconf_input(client, "high", "netcfg/error");
debconf_go(client);
debconf_capb(client, "backup");
return -1;
}
return 0;
}
static int netcfg_activate_static(struct debconfclient *client,
const struct netcfg_interface *interface)
{
int rv = -1;
if (interface->address_family == AF_INET) {
rv = netcfg_activate_static_ipv4(client, interface);
} else if (interface->address_family == AF_INET6) {
rv = netcfg_activate_static_ipv6(client, interface);
} else {
fprintf(stderr, "Can't happen: unknown address family");
rv = -1;
}
if (rv != 0) {
/* No point looking for link if the address configuration didn't
* work.
*/
return -1;
}
/* Wait to detect link. Don't error out if we fail, though; link detection
* may not work on this NIC or something.
*/
netcfg_detect_link(client, interface);
/* Configuration appeared to go OK. Now we need to wait until the
* interface is actually configured by the kernel. For IPv4, this
* *should* be close to instantaneous, but for IPv6 there can be an
* appreciable delay because the kernel does duplicate address detection
* before making the interface active. The delay in activating the
* interface can cause untold grief and misery for later parts of the
* network configuration process that expect to have a working network
* (rDNS preseeding of the hostname is the one that has caused this code
* to be written).
*/
if (interface->address_family == AF_INET6) {
nc_v6_wait_for_complete_configuration(interface);
}
return 0;
}
int netcfg_get_static(struct debconfclient *client, struct netcfg_interface *iface)
{
char *nameservers = NULL;
char *none;
char netmask[INET_ADDRSTRLEN];
enum { BACKUP, GET_HOSTNAME, GET_IPADDRESS, GET_POINTOPOINT, GET_NETMASK,
GET_GATEWAY, GATEWAY_UNREACHABLE, GET_NAMESERVERS, CONFIRM,
GET_DOMAIN, QUIT }
state = GET_IPADDRESS;
debconf_metaget(client, "netcfg/internal-none", "description");
none = client->value ? strdup(client->value) : strdup("<none>");
for (;;) {
switch (state) {
case BACKUP:
return RETURN_TO_MAIN;
break;
case GET_IPADDRESS:
if (netcfg_get_ipaddress (client, iface)) {
state = BACKUP;
} else {
if (strncmp(iface->name, "plip", 4) == 0
|| strncmp(iface->name, "slip", 4) == 0
|| strncmp(iface->name, "ctc", 3) == 0
|| strncmp(iface->name, "escon", 5) == 0
|| strncmp(iface->name, "iucv", 4) == 0)
state = GET_POINTOPOINT;
else if (iface->masklen == 0) {
state = GET_NETMASK;
} else {
state = GET_GATEWAY;
}
}
break;
case GET_POINTOPOINT:
if (iface->address_family == AF_INET6) {
debconf_capb(client); /* Turn off backup */
debconf_input(client, "high", "netcfg/no_ipv6_pointopoint");
debconf_go(client);
state = GET_IPADDRESS;
debconf_capb(client, "backup");
break;
}
state = netcfg_get_pointopoint(client, iface) ?
GET_IPADDRESS : GET_NAMESERVERS;
break;
case GET_NETMASK:
state = netcfg_get_netmask(client, iface) ?
GET_IPADDRESS : GET_GATEWAY;
break;
case GET_GATEWAY:
netcfg_preseed_gateway(client, iface);
if (netcfg_get_gateway(client, iface))
state = GET_NETMASK;
else
if (strlen(iface->gateway) > 0 && !netcfg_gateway_reachable(iface))
state = GATEWAY_UNREACHABLE;
else
state = GET_NAMESERVERS;
break;
case GATEWAY_UNREACHABLE:
debconf_capb(client); /* Turn off backup */
debconf_input(client, "high", "netcfg/gateway_unreachable");
debconf_go(client);
state = GET_GATEWAY;
debconf_capb(client, "backup");
break;
case GET_NAMESERVERS:
if (nameservers) free(nameservers);
state = (netcfg_get_nameservers (client, &nameservers, iface->gateway)) ?
GET_GATEWAY : CONFIRM;
break;
case GET_HOSTNAME:
{
char buf[MAXHOSTNAMELEN + 1] = { 0 };
debconf_get(client, "netcfg/hostname");
if (!empty_str(client->value))
{
strncpy(buf, client->value, MAXHOSTNAMELEN);
preseed_hostname_from_fqdn(client, buf);
}
else if (get_hostname_from_dns(iface, buf, sizeof(buf)))
preseed_hostname_from_fqdn(client, buf);
}
state = (netcfg_get_hostname(client, "netcfg/get_hostname", hostname, 1)) ?
GET_NAMESERVERS : GET_DOMAIN;
break;
case GET_DOMAIN:
if (!have_domain) {
state = (netcfg_get_domain (client, domain)) ?
GET_HOSTNAME : QUIT;
} else {
di_info("domain = %s", domain);
state = QUIT;
}
break;
case CONFIRM:
inet_mtop(AF_INET, iface->masklen, netmask, INET_ADDRSTRLEN);
debconf_subst(client, "netcfg/confirm_static", "interface", iface->name);
debconf_subst(client, "netcfg/confirm_static", "ipaddress", empty_str(iface->ipaddress) ? none : iface->ipaddress);
debconf_subst(client, "netcfg/confirm_static", "pointopoint", empty_str(iface->pointopoint) ? none : iface->pointopoint);
debconf_subst(client, "netcfg/confirm_static", "netmask", empty_str(netmask) ? none : netmask);
debconf_subst(client, "netcfg/confirm_static", "gateway", empty_str(iface->gateway) ? none : iface->gateway);
debconf_subst(client, "netcfg/confirm_static", "nameservers",
(nameservers ? nameservers : none));
netcfg_nameservers_to_array(nameservers, iface);
free(nameservers);
nameservers = NULL;
debconf_capb(client); /* Turn off backup for yes/no confirmation */
debconf_input(client, "medium", "netcfg/confirm_static");
debconf_go(client);
debconf_get(client, "netcfg/confirm_static");
if (strstr(client->value, "true")) {
state = GET_HOSTNAME;
netcfg_write_resolv(domain, iface);
netcfg_activate_static(client, iface);
}
else
state = GET_IPADDRESS;
debconf_capb(client, "backup");
break;
case QUIT:
{
char network[INET_ADDRSTRLEN];
if (iface->address_family == AF_INET) {
netcfg_network_address(iface, network);
netcfg_write_etc_networks(network);
} else {
netcfg_write_etc_networks(NULL);
}
netcfg_write_common(iface->ipaddress, hostname, domain);
netcfg_write_loopback();
netcfg_write_interface(iface);
netcfg_write_resolvconf_options(domain, iface);
netcfg_write_resolv(domain, iface);
}
return 0;
break;
}
}
return 0;
}
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