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/*
* DHCP module for netcfg/netcfg-dhcp.
*
* Licensed under the terms of the GNU General Public License
*/
#include "netcfg.h"
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <debian-installer.h>
#include <stdio.h>
#include <assert.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <time.h>
#include <netdb.h>
#define DHCP_OPTION_LEN 1236 /* pump 0.8.24 defines a max option size of 57,
dhcp 2.0pl5 uses 1222, dhcp3 3.0.6 uses 1236 */
const char* dhclient_request_options_dhclient[] = { "subnet-mask",
"broadcast-address",
"time-offset",
"routers",
"domain-name",
"domain-name-servers",
"host-name",
"ntp-servers", /* extra */
NULL };
const char* dhclient_request_options_udhcpc[] = { "subnet",
"broadcast",
"router",
"domain",
"hostname",
"dns",
"ntpsrv", /* extra */
NULL };
static int dhcp_exit_status = 1;
static pid_t dhcp_pid = -1;
/* Returns 1 if no default route is available */
static short no_default_route (void)
{
#if defined(__FreeBSD_kernel__)
int status4, status6;
status4 = system("exec /lib/freebsd/route show default >/dev/null 2>&1");
status6 = system("exec /lib/freebsd/route show -inet6 default >/dev/null 2>&1");
return (WEXITSTATUS(status4) != 0) && (WEXITSTATUS(status6) != 0);
#elif defined(__GNU__)
FILE* pfinet = NULL;
char buf[1024] = { 0 };
pfinet = popen("fsysopts /servers/socket/2", "r");
if (!pfinet)
return 1;
if (fgets (buf, 1024, pfinet) == NULL) {
pclose (pfinet);
return 1;
}
pclose (pfinet);
return !strstr (buf, "--gateway=");
#else
FILE* iproute = NULL;
char buf[256] = { 0 };
/* IPv4 default route? */
if ((iproute = popen("ip route", "r")) != NULL) {
while (fgets (buf, 256, iproute) != NULL) {
if (strncmp(buf, "default via ", 12) == 0) {
pclose(iproute);
return 0;
}
}
pclose(iproute);
}
/* IPv6 default route? */
if ((iproute = popen("ip -6 route", "r")) != NULL) {
while (fgets (buf, 256, iproute) != NULL) {
if (strncmp(buf, "default via ", 12) == 0) {
pclose(iproute);
return 0;
}
}
pclose(iproute);
}
return 1;
#endif
}
/*
* Signal handler for DHCP client child
*
* When the child exits (either because it failed to obtain a
* lease or because it succeeded and daemonized itself), this
* gets the child's exit status and sets dhcp_pid to -1
*/
static void cleanup_dhcp_client(void)
{
if (dhcp_pid <= 0)
/* Already cleaned up */
return;
if (waitpid(dhcp_pid, &dhcp_exit_status, WNOHANG) != dhcp_pid)
/* Wasn't us */
return;
if (WIFEXITED(dhcp_exit_status))
dhcp_pid = -1;
}
/* Run through the available client process handlers we're running, and tell
* them to cleanup if required.
*/
void sigchld_handler(int sig __attribute__ ((unused)))
{
cleanup_dhcp_client();
cleanup_rdnssd();
cleanup_dhcpv6_client();
}
/*
* This function will start whichever DHCP client is available
* using the provided DHCP hostname, if supplied
*
* The client's PID is stored in dhcp_pid.
*/
int start_dhcp_client (struct debconfclient *client, char* dhostname, const char *if_name)
{
FILE *dc = NULL;
const char **ptr;
char **arguments;
int options_count;
enum { DHCLIENT, PUMP, UDHCPC } dhcp_client;
int dhcp_seconds;
char dhcp_seconds_str[16];
int dhostnamelen = strnlen(dhostname, MAXHOSTNAMELEN - 1);
dhostname[dhostnamelen] = '\0';
if (access("/sbin/dhclient", F_OK) == 0)
dhcp_client = DHCLIENT;
else if (access("/sbin/pump", F_OK) == 0)
dhcp_client = PUMP;
else if (access("/sbin/udhcpc", F_OK) == 0)
dhcp_client = UDHCPC;
else {
debconf_input(client, "critical", "netcfg/no_dhcp_client");
debconf_go(client);
exit(1);
}
debconf_get(client, "netcfg/dhcp_timeout");
dhcp_seconds = atoi(client->value);
snprintf(dhcp_seconds_str, sizeof dhcp_seconds_str, "%d", dhcp_seconds-1);
if ((dhcp_pid = fork()) == 0) { /* child */
/* disassociate from debconf */
fclose(client->out);
/* get dhcp lease */
switch (dhcp_client) {
case PUMP:
if (dhostnamelen > 0)
execlp("pump", "pump", "-i", if_name, "-h", dhostname, NULL);
else
execlp("pump", "pump", "-i", if_name, NULL);
break;
case DHCLIENT:
/* First, set up dhclient.conf */
if ((dc = file_open(DHCLIENT_CONF, "w"))) {
fprintf(dc, "send vendor-class-identifier \"d-i\";\n" );
fprintf(dc, "request ");
for (ptr = dhclient_request_options_dhclient; *ptr; ptr++) {
fprintf(dc, "%s", *ptr);
/* look ahead to see if it is the last entry */
if (*(ptr + 1))
fprintf(dc, ", ");
else
fprintf(dc, ";\n");
}
if (dhostnamelen > 0) {
fprintf(dc, "send host-name \"%s\";\n", dhostname);
}
fprintf(dc, "timeout %d;\n", dhcp_seconds);
fprintf(dc, "initial-interval 1;\n");
fclose(dc);
}
execlp("dhclient", "dhclient", "-1", if_name, "-cf", DHCLIENT_CONF, NULL);
break;
case UDHCPC:
/* figure how many options we have */
options_count = 0;
for (ptr = dhclient_request_options_udhcpc; *ptr; ptr++)
options_count++;
arguments = malloc((options_count * 2 /* -O <option> repeatedly */
+ 9 /* Other arguments (listed below) */
+ 2 /* dhostname (maybe) */
+ 1 /* NULL */
) * sizeof(char **));
/* set the command options */
options_count = 0;
arguments[options_count++] = "udhcpc";
arguments[options_count++] = "-i";
arguments[options_count++] = (char *)if_name;
arguments[options_count++] = "-V";
arguments[options_count++] = "d-i";
arguments[options_count++] = "-T";
arguments[options_count++] = "1";
arguments[options_count++] = "-t";
arguments[options_count++] = dhcp_seconds_str;
for (ptr = dhclient_request_options_udhcpc; *ptr; ptr++) {
arguments[options_count++] = "-O";
arguments[options_count++] = (char *)*ptr;
}
if (dhostnamelen > 0) {
arguments[options_count++] = "-H";
arguments[options_count++] = dhostname;
}
arguments[options_count] = NULL;
execvp("udhcpc", arguments);
free(arguments);
break;
}
if (errno != 0)
di_error("Could not exec dhcp client: %s", strerror(errno));
return 1; /* should NEVER EVER get here */
}
else if (dhcp_pid == -1) {
di_warning("DHCP fork failed; this is unlikely to end well");
return 1;
} else {
/* dhcp_pid contains the child's PID */
di_warning("Started DHCP client; PID is %i", dhcp_pid);
signal(SIGCHLD, &sigchld_handler);
return 0;
}
}
static int kill_dhcp_client(void)
{
if (system("kill-all-dhcp")) {
/* We can't do much about errors anyway, so ignore them. */
}
return 0;
}
/*
* Poll the started DHCP client for netcfg/dhcp_timeout seconds (def. 15)
* and return true if a lease is known to have been acquired, 0 otherwise.
*
* The client should be run such that it exits once a lease is acquired
* (although its child continues to run as a daemon)
*
* This function will NOT kill the child if time runs out. This allows
* the user to choose to wait longer for the lease to be acquired.
*/
int poll_dhcp_client (struct debconfclient *client)
{
int seconds_slept = 0;
int ret = 0;
int dhcp_seconds;
debconf_get(client, "netcfg/dhcp_timeout");
dhcp_seconds = atoi(client->value);
/* show progress bar */
debconf_capb(client, "backup progresscancel");
debconf_progress_start(client, 0, dhcp_seconds, "netcfg/dhcp_progress");
if (debconf_progress_info(client, "netcfg/dhcp_progress_note") ==
CMD_PROGRESSCANCELLED) {
kill_dhcp_client();
goto stop;
}
/* wait between 2 and dhcp_seconds seconds for a DHCP lease */
while ( ((dhcp_pid > 0) || (seconds_slept < 2))
&& (seconds_slept < dhcp_seconds) ) {
sleep(1);
seconds_slept++; /* Not exact but close enough */
if (debconf_progress_step(client, 1) == CMD_PROGRESSCANCELLED)
goto stop;
}
/* Either the client exited or time ran out */
/* got a lease? display a success message */
if (!(dhcp_pid > 0) && (dhcp_exit_status == 0)) {
ret = 1;
debconf_capb(client, "backup"); /* stop displaying cancel button */
if (debconf_progress_set(client, dhcp_seconds) ==
CMD_PROGRESSCANCELLED)
goto stop;
if (debconf_progress_info(client, "netcfg/dhcp_success_note") ==
CMD_PROGRESSCANCELLED)
goto stop;
sleep(2);
}
stop:
/* stop progress bar */
debconf_progress_stop(client);
debconf_capb(client, "backup");
return ret;
}
#define REPLY_RETRY_AUTOCONFIG 0
#define REPLY_RETRY_WITH_HOSTNAME 1
#define REPLY_CONFIGURE_MANUALLY 2
#define REPLY_DONT_CONFIGURE 3
#define REPLY_RECONFIGURE_WIFI 4
#define REPLY_LOOP_BACK 5
#define REPLY_CHECK_DHCP 6
#define REPLY_ASK_OPTIONS 7
int ask_dhcp_options (struct debconfclient *client, const char *if_name)
{
if (is_wireless_iface(if_name)) {
debconf_metaget(client, "netcfg/internal-wifireconf", "description");
debconf_subst(client, "netcfg/dhcp_options", "wifireconf", client->value);
}
else /* blank from last time */
debconf_subst(client, "netcfg/dhcp_options", "wifireconf", "");
/* critical, we don't want to enter a loop */
debconf_input(client, "critical", "netcfg/dhcp_options");
if (debconf_go(client) == CMD_GOBACK)
return GO_BACK;
debconf_get(client, "netcfg/dhcp_options");
/* strcmp sucks */
if (client->value[0] == 'R') { /* _R_etry ... or _R_econfigure ... */
size_t len = strlen(client->value);
if (client->value[len - 1] == 'e') /* ... with DHCP hostnam_e_ */
return REPLY_RETRY_WITH_HOSTNAME;
else if (client->value[len - 1] == 'k') /* ... wireless networ_k_ */
return REPLY_RECONFIGURE_WIFI;
else
return REPLY_RETRY_AUTOCONFIG;
}
else if (client->value[0] == 'C') /* _C_onfigure ... */
return REPLY_CONFIGURE_MANUALLY;
else if (empty_str(client->value))
return REPLY_LOOP_BACK;
else
return REPLY_DONT_CONFIGURE;
}
int ask_wifi_configuration (struct debconfclient *client, struct netcfg_interface *interface)
{
enum { ABORT, ESSID, SECURITY_TYPE, WEP, WPA, START, DONE } wifistate = ESSID;
if (interface->wpa_supplicant_status != WPA_UNAVAIL)
kill_wpa_supplicant();
for (;;) {
switch (wifistate) {
case ESSID:
if (interface->wpa_supplicant_status == WPA_UNAVAIL)
wifistate = (netcfg_wireless_set_essid(client, interface) == GO_BACK) ?
ABORT : WEP;
else
wifistate = (netcfg_wireless_set_essid(client, interface) == GO_BACK) ?
ABORT : SECURITY_TYPE;
break;
case SECURITY_TYPE:
{
int ret;
ret = wireless_security_type(client, interface->name);
if (ret == GO_BACK)
wifistate = ESSID;
else if (ret == REPLY_WPA) {
wifistate = WPA;
interface->wifi_security = REPLY_WPA;
}
else {
wifistate = WEP;
interface->wifi_security = REPLY_WEP;
}
break;
}
case WEP:
if (interface->wpa_supplicant_status == WPA_UNAVAIL)
wifistate = (netcfg_wireless_set_wep(client, interface) == GO_BACK) ?
ESSID : DONE;
else
wifistate = (netcfg_wireless_set_wep(client, interface) == GO_BACK) ?
SECURITY_TYPE : DONE;
break;
case WPA:
wifistate = (netcfg_set_passphrase(client, interface) == GO_BACK) ?
SECURITY_TYPE : START;
break;
case START:
wifistate = (wpa_supplicant_start(client, interface) == GO_BACK) ?
ESSID : DONE;
break;
case ABORT:
return REPLY_ASK_OPTIONS;
break;
case DONE:
return REPLY_CHECK_DHCP;
break;
}
}
}
/* Back in the day, this function was the main entry point for DHCP-enabled
* netcfg; now it's slowly dying, doing quadruple duty handling all manner of
* autoconfiguration and the associated stuffing around, much of which is
* duplicated with static configuration. Eventually, this whole mess will be
* merged with the static configuration code, and there will be much
* rejoicing.
*/
int netcfg_activate_dhcp (struct debconfclient *client, struct netcfg_interface *interface)
{
enum { AUTOCONFIG, DEFAULT_GATEWAY, NAMESERVERS,
ASK_OPTIONS, DHCP_HOSTNAME, HOSTNAME, DOMAIN, HOSTNAME_SANS_NETWORK
} state = AUTOCONFIG;
char *if_name = interface->name;
kill_dhcp_client();
loop_setup();
interface_up(interface->name);
for (;;) {
di_debug("State is now %i", state);
switch (state) {
case AUTOCONFIG:
if (!netcfg_autoconfig(client, interface)) {
/* autoconfiguration has most definitely failed */
debconf_capb(client, "");
debconf_input(client, "critical", "netcfg/dhcp_failed");
debconf_go(client);
debconf_capb(client, "backup");
state = ASK_OPTIONS;
} else {
state = DEFAULT_GATEWAY;
}
break;
case DEFAULT_GATEWAY:
if (no_default_route()) {
debconf_input(client, "critical", "netcfg/no_default_route");
debconf_go(client);
debconf_get(client, "netcfg/no_default_route");
if (!strcmp(client->value, "false")) {
state = ASK_OPTIONS;
break;
}
}
state = NAMESERVERS;
break;
case NAMESERVERS:
/* Make sure we have NS going if the DHCP server didn't serve it up */
if (nameserver_count(interface) == 0) {
char *nameservers = NULL;
if (netcfg_get_nameservers (client, &nameservers, NULL) == GO_BACK) {
state = ASK_OPTIONS;
break;
}
netcfg_nameservers_to_array (nameservers, interface);
free(nameservers);
nameservers = NULL;
}
/* We don't have a domain name yet, but we need to write out the
* nameservers now so we can do rDNS lookups later to possibly
* find out the domain.
*/
netcfg_write_resolv(NULL, interface);
state = HOSTNAME;
break;
case ASK_OPTIONS:
/* DHCP client may still be running */
switch (ask_dhcp_options (client, if_name)) {
case GO_BACK:
kill_dhcp_client();
stop_rdnssd();
interface->dhcp = 0;
return RETURN_TO_MAIN;
case REPLY_RETRY_WITH_HOSTNAME:
state = DHCP_HOSTNAME;
break;
case REPLY_CONFIGURE_MANUALLY:
kill_dhcp_client();
stop_rdnssd();
interface->dhcp = 0;
return CONFIGURE_MANUALLY;
case REPLY_DONT_CONFIGURE:
kill_dhcp_client();
stop_rdnssd();
state = HOSTNAME_SANS_NETWORK;
break;
case REPLY_RETRY_AUTOCONFIG:
state = AUTOCONFIG;
break;
case REPLY_RECONFIGURE_WIFI:
if (ask_wifi_configuration(client, interface) == REPLY_CHECK_DHCP) {
state = AUTOCONFIG;
}
else
state = ASK_OPTIONS;
break;
}
break;
case DHCP_HOSTNAME:
/* DHCP client may still be running */
if (netcfg_get_hostname(client, "netcfg/dhcp_hostname", interface->dhcp_hostname, 0))
state = ASK_OPTIONS;
else {
kill_dhcp_client();
stop_rdnssd();
state = AUTOCONFIG;
}
break;
case HOSTNAME:
{
char buf[MAXHOSTNAMELEN + 1] = { 0 };
/*
* If the netcfg/hostname preseed value is set use that
* otherwise default to the hostname returned via DHCP, if any,
* otherwise to the requested DHCP hostname
* otherwise to the hostname found in DNS for the IP address
* of the interface
*/
debconf_get(client, "netcfg/hostname");
if (!empty_str(client->value)) {
strncpy(buf, client->value, MAXHOSTNAMELEN);
di_debug("Using preseeded hostname");
preseed_hostname_from_fqdn(client, buf);
}
else if (gethostname(buf, sizeof(buf)) == 0
&& !empty_str(buf)
&& strcmp(buf, "(none)")
) {
di_info("DHCP hostname: \"%s\"", buf);
preseed_hostname_from_fqdn(client, buf);
}
else if (!empty_str(interface->dhcp_hostname)) {
di_debug("Defaulting hostname to provided DHCP hostname");
debconf_set(client, "netcfg/get_hostname", interface->dhcp_hostname);
} else {
di_debug("Using DNS to try and obtain default hostname");
if (get_hostname_from_dns(interface, buf, sizeof(buf)))
preseed_hostname_from_fqdn(client, buf);
}
if (netcfg_get_hostname (client, "netcfg/get_hostname", hostname, 1)) {
/*
* Going back to POLL wouldn't make much sense.
* However, it does make sense to go to the retry
* screen where the user can elect to retry DHCP with
* a requested DHCP hostname, etc.
*/
state = ASK_OPTIONS;
}
else
state = DOMAIN;
}
break;
case DOMAIN:
if (!have_domain && netcfg_get_domain (client, domain))
state = HOSTNAME;
else {
di_debug("Network config complete");
netcfg_write_common("", hostname, domain);
netcfg_write_loopback();
netcfg_write_interface(interface);
netcfg_write_resolv(domain, interface);
#if !defined(__FreeBSD_kernel__)
kill_dhcp_client();
#endif
stop_rdnssd();
return 0;
}
break;
case HOSTNAME_SANS_NETWORK:
if (netcfg_get_hostname (client, "netcfg/get_hostname", hostname, 0))
state = ASK_OPTIONS;
else {
netcfg_write_common("", hostname, NULL);
interface->dhcp = 0;
return 0;
}
break;
}
}
}
/* Count the number of actual entries in the nameservers array */
int nameserver_count (const struct netcfg_interface *interface)
{
unsigned int count = 0, i;
for (i = 0; i < NETCFG_NAMESERVERS_MAX; i++) {
if (!empty_str(interface->nameservers[i])) count++;
}
return count;
}
/* Read the nameserver entries out of resolv.conf and stick them into
* array, so we can write out a newer, shinier resolv.conf
*/
int read_resolv_conf_nameservers(char *resolv_conf_file, struct netcfg_interface *interface)
{
FILE *f;
unsigned int i = 0;
di_debug("Reading nameservers from %s", resolv_conf_file);
if ((f = fopen(resolv_conf_file, "r")) != NULL) {
char buf[256];
while (fgets(buf, 256, f) != NULL) {
char *ptr;
if (strncmp(buf, "nameserver ", strlen("nameserver ")) == 0) {
rtrim(buf);
ptr = buf + strlen("nameserver ");
strncpy(interface->nameservers[i], ptr, NETCFG_ADDRSTRLEN);
di_debug("Read nameserver %s", interface->nameservers[i]);
i++;
if (i >= NETCFG_NAMESERVERS_MAX) {
/* We can only hold so many nameservers, and we've reached
* our limit. Sorry.
*/
break;
}
}
}
fclose(f);
/* Null out any remaining elements in array */
for (; i < NETCFG_NAMESERVERS_MAX; i++) *(interface->nameservers[i]) = '\0';
return 1;
}
else
return 0;
}
/* Start a DHCP(v4) client, and see if we get a meaningful response back.
*
* Return 1 if the DHCP client appears to have worked, or 0 if we should
* use another method to get our network configuration.
*/
int netcfg_dhcp(struct debconfclient *client, struct netcfg_interface *interface)
{
FILE *d;
if (start_dhcp_client(client, interface->dhcp_hostname, interface->name)) {
di_warning("DHCP client failed to start. Aborting DHCP configuration.");
return 0;
}
interface->dhcp = poll_dhcp_client(client);
/*
* Default to the domain name returned via DHCP, if any
*/
if (!have_domain && (d = fopen(DOMAIN_FILE, "r")) != NULL) {
di_debug("Reading domain name returned via DHCP");
domain[0] = '\0';
while (fgets(domain, sizeof(domain), d) != NULL) {
rtrim(domain);
di_debug("DHCP domain name is '%s'", domain);
if (!empty_str(domain)) {
have_domain = 1;
}
}
fclose(d);
unlink(DOMAIN_FILE);
}
/*
* Record any ntp server information from DHCP for later
* verification and use by clock-setup
*/
if ((d = fopen(NTP_SERVER_FILE, "r")) != NULL) {
char ntpservers[DHCP_OPTION_LEN + 1] = { 0 }, *ptr, *srv;
int i;
di_debug("Reading NTP servers from DHCP info");
while (fgets(ntpservers, DHCP_OPTION_LEN, d) != NULL) {
rtrim(ntpservers);
}
fclose(d);
unlink(NTP_SERVER_FILE);
if (!empty_str(ntpservers)) {
ptr = ntpservers;
for (i = 0; i < NETCFG_NTPSERVERS_MAX; i++) {
srv = strtok_r(ptr, " \n\t", &ptr);
if (srv) {
di_debug("Read NTP server %s", srv);
strncpy(interface->ntp_servers[i], srv, NETCFG_ADDRSTRLEN);
} else {
*(interface->ntp_servers[i]) = '\0';
}
}
}
}
/* Get a copy of the DNS servers that the DHCP server got */
read_resolv_conf_nameservers(RESOLV_FILE, interface);
return interface->dhcp;
}
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