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netcfg-common.c
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netcfg-common.c
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/*
netcfg-common.c - Shared functions used to configure the network for
the debian-installer.
Copyright (C) 2000-2002 David Kimdon <[email protected]>
and others (see debian/copyright)
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "netcfg.h"
#if defined(WIRELESS)
#include <iwlib.h>
#endif
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <errno.h>
#include <assert.h>
#include <ctype.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 <fcntl.h>
#include <cdebconf/debconfclient.h>
#include <debian-installer.h>
#include <time.h>
#include <netdb.h>
#include <ifaddrs.h>
#ifdef __linux__
#include <netpacket/packet.h>
#define SYSCLASSNET "/sys/class/net/"
#endif /* __linux__ */
#ifdef __FreeBSD_kernel__
#include <net/if_dl.h>
#define LO_IF "lo0"
#else
#define LO_IF "lo"
#endif
/* Set if there is currently a progress bar displayed. */
int netcfg_progress_displayed = 0;
/* IP address vars */
struct in_addr ipaddress = { 0 };
struct in_addr gateway = { 0 };
struct in_addr nameserver_array[4] = { { 0 }, };
/* network config */
char *interface = NULL;
char *hostname = NULL;
char *domain = NULL;
int have_domain = 0;
/* File descriptors for ioctls and such */
int skfd = 0;
#ifdef WIRELESS
int wfd = 0;
#endif
/* convert a netmask (255.255.255.0) into the length (24) */
int inet_ptom (const char *src, int *dst, struct in_addr *addrp)
{
struct in_addr newaddr, *addr;
in_addr_t mask, num;
if (src && !addrp) {
if (inet_pton (AF_INET, src, &newaddr) < 0)
return 0;
addr = &newaddr;
}
else
addr = addrp;
mask = ntohl(addr->s_addr);
for (num = mask; num & 1; num >>= 1);
if (num != 0 && mask != 0) {
for (num = ~mask; num & 1; num >>= 1);
if (num)
return 0;
}
for (num = 0; mask; mask <<= 1)
num++;
*dst = num;
return 1;
}
/* convert a length (24) into the netmask (255.255.255.0) */
const char *inet_mtop (int src, char *dst, socklen_t cnt)
{
struct in_addr addr;
in_addr_t mask = 0;
for(; src; src--)
mask |= 1 << (32 - src);
addr.s_addr = htonl(mask);
return inet_ntop (AF_INET, &addr, dst, cnt);
}
void open_sockets (void)
{
#ifdef WIRELESS
wfd = iw_sockets_open();
#endif
skfd = socket (AF_INET, SOCK_DGRAM, 0);
}
#ifdef __linux__
/* Returns non-zero if this interface has an enabled kill switch, otherwise
* zero.
*/
int check_kill_switch(const char *iface)
{
char *temp, *linkbuf;
const char *killname;
char killstate;
size_t len;
int linklen, killlen;
int fd = -1;
int ret = 0;
/* longest string we need */
len = strlen(SYSCLASSNET) + strlen(iface) + strlen("/device/rf_kill") + 1;
temp = malloc(len);
snprintf(temp, len, SYSCLASSNET "%s/driver", iface);
linkbuf = malloc(1024); /* probably OK ... I hate readlink() */
linklen = readlink(temp, linkbuf, 1024);
if (linklen < 0)
goto out;
if (strncmp(linkbuf + linklen - 8, "/ipw2100", 8) == 0)
killname = "rf_kill";
else if (strncmp(linkbuf + linklen - 8, "/ipw2200", 8) == 0)
killname = "rf_kill";
else
goto out;
snprintf(temp, len, SYSCLASSNET "%s/device/%s", iface, killname);
di_info("Checking RF kill switch: %s", temp);
fd = open(temp, O_RDONLY);
if (fd == -1)
goto out;
killlen = read(fd, &killstate, 1);
if (killlen < 0) {
di_error("Failed to read RF kill state: %s", strerror(errno));
goto out;
} else if (killlen == 0) {
di_warning("RF kill state file empty");
goto out;
}
if (killstate == '2') {
di_info("RF kill switch enabled");
ret = 1;
}
out:
free(temp);
free(linkbuf);
if (fd != -1)
close(fd);
return ret;
}
#else /* !__linux__ */
int check_kill_switch(const char *iface)
{
return 0;
}
#endif /* __linux__ */
#if defined(WIRELESS)
int is_raw_80211(const char *iface)
{
struct ifreq ifr;
struct sockaddr sa;
strncpy(ifr.ifr_name, iface, IFNAMSIZ);
if (skfd && ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0) {
di_warning("Unable to retrieve interface type.");
return 0;
}
sa = * (struct sockaddr *) &ifr.ifr_hwaddr;
switch (sa.sa_family) {
case ARPHRD_IEEE80211:
case ARPHRD_IEEE80211_PRISM:
case ARPHRD_IEEE80211_RADIOTAP:
return 1;
default:
return 0;
}
}
#endif
int qsort_strcmp(const void *a, const void *b)
{
const char **ia = (const char **)a;
const char **ib = (const char **)b;
return strcmp(*ia, *ib);
}
#ifdef __GNU__
#include <mach.h>
#include <device/device.h>
#include <hurd.h>
/* On Hurd, the IP stack (pfinet) does not know the list of network interfaces
* before we configure them, so we cannot use getifaddrs(). Instead we try
* possible names for network interfaces and check whether they exists by
* attempting to open the kernel device. */
int get_all_ifs (int all, char*** ptr)
{
static const char *const fmt[] = { "eth%d", "wl%d", NULL };
mach_port_t device_master;
device_t device;
int err;
char **list;
int num, i, j;
char name[3 + 3 * sizeof (int) + 1];
err = get_privileged_ports (0, &device_master);
if (err)
return 0;
num = 0;
list = malloc(sizeof *list);
for (i = 0; fmt[i]; i++)
for (j = 0;; j++) {
sprintf (name, fmt[i], j);
err = device_open (device_master, D_READ, name, &device);
if (err != 0)
break;
device_close (device);
mach_port_deallocate (mach_task_self (), device);
list = realloc (list, (num + 2) * sizeof *list);
list[num++] = strdup(name);
}
list[num] = NULL;
mach_port_deallocate (mach_task_self (), device_master);
*ptr = list;
return num;
}
#else
int get_all_ifs (int all, char*** ptr)
{
struct ifaddrs *ifap, *ifa;
char ibuf[512];
char** list = NULL;
size_t len = 0;
if (getifaddrs(&ifap) == -1)
return 0;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
strncpy(ibuf, ifa->ifa_name, sizeof(ibuf));
if (ifa->ifa_flags & IFF_LOOPBACK) /* ignore loopback devices */
continue;
#if defined(__linux__)
if (!strncmp(ibuf, "sit", 3)) /* ignore tunnel devices */
continue;
#endif
#if defined(__FreeBSD_kernel__)
if (!strncmp(ibuf, "pfsync", 6)) /* ignore pfsync devices */
continue;
if (!strncmp(ibuf, "pflog", 5)) /* ignore pflog devices */
continue;
if (!strncmp(ibuf, "usbus", 5)) /* ignore usbus devices */
continue;
#endif
#if defined(WIRELESS)
if (is_raw_80211(ibuf))
continue;
#endif
if (all || ifa->ifa_flags & IFF_UP) {
int found = 0;
size_t i;
for (i = 0 ; i < len ; i++) {
if (!strcmp(ibuf, list[i])) {
found = 1;
}
}
if (!found) {
list = realloc(list, sizeof(char*) * (len + 2));
list[len] = strdup(ibuf);
len++;
}
}
}
/* OK, now sort the list and terminate it if necessary */
if (list != NULL) {
qsort(list, len, sizeof(char *), qsort_strcmp);
list[len] = NULL;
}
freeifaddrs(ifap);
*ptr = list;
return len;
}
#endif
#ifdef __linux__
short find_in_stab(const char* iface)
{
FILE *dn = NULL;
char buf[128];
size_t len = strlen(iface);
if (access(STAB, F_OK) == -1)
return 0;
if (!(dn = popen("grep -v '^Socket' " STAB " | cut -f5", "r")))
return 0;
while (fgets (buf, 128, dn) != NULL) {
if (!strncmp(buf, iface, len)) {
pclose(dn);
return 1;
}
}
pclose(dn);
return 0;
}
#else /* !__linux__ */
/* Stub function for platforms not supporting /var/run/stab. */
short find_in_stab(const char* iface)
{
return 0;
}
#endif /* __linux__ */
char *find_in_devnames(const char* iface)
{
FILE* dn = NULL;
char buf[512], *result = NULL;
size_t len = strlen(iface);
if (!(dn = fopen(DEVNAMES, "r")))
return NULL;
while (fgets(buf, 512, dn) != NULL) {
char *ptr = strchr(buf, ':'), *desc = ptr + 1;
if (!ptr) {
result = NULL; /* corrupt */
break;
}
else if (!strncmp(buf, iface, len)) {
result = strdup(desc);
break;
}
}
fclose(dn);
if (result) {
len = strlen(result);
if (result[len - 1] == '\n')
result[len - 1] = '\0';
}
return result;
}
char *get_ifdsc(struct debconfclient *client, const char *ifp)
{
char template[256], *ptr = NULL;
if ((ptr = find_in_devnames(ifp)) != NULL) {
debconf_metaget(client, "netcfg/internal-wireless", "description");
if (is_wireless_iface(ifp)) {
size_t len = strlen(ptr) + strlen(client->value) + 4;
ptr = realloc(ptr, len);
di_snprintfcat(ptr, len, " (%s)", client->value);
}
return ptr; /* already strdup'd */
}
if (strlen(ifp) < 100) {
if (!is_wireless_iface(ifp)) {
/* strip away the number from the interface (eth0 -> eth) */
char *new_ifp = strdup(ifp), *ptr = new_ifp;
while ((*ptr < '0' || *ptr > '9') && *ptr != '\0')
ptr++;
*ptr = '\0';
sprintf(template, "netcfg/internal-%s", new_ifp);
free(new_ifp);
if (debconf_metaget(client, template, "description") == 0 &&
client->value != NULL) {
return strdup(client->value);
}
} else {
strcpy(template, "netcfg/internal-wifi");
debconf_metaget(client, template, "description");
return strdup(client->value);
}
}
debconf_metaget(client, "netcfg/internal-unknown-iface", "description");
if (client->value != NULL)
return strdup(client->value);
else
return strdup("Unknown interface");
}
int iface_is_hotpluggable(const char *iface)
{
FILE* f = NULL;
char buf[256];
size_t len = strlen(iface);
if (!(f = fopen(DEVHOTPLUG, "r"))) {
di_info("No hotpluggable devices are present in the system.");
return 0;
}
while (fgets(buf, 256, f) != NULL) {
if (!strncmp(buf, iface, len)) {
di_info("Detected %s as a hotpluggable device", iface);
fclose(f);
return 1;
}
}
fclose(f);
di_info("Hotpluggable devices available, but %s is not one of them", iface);
return 0;
}
FILE *file_open(char *path, const char *opentype)
{
FILE *fp;
if ((fp = fopen(path, opentype)))
return fp;
else {
fprintf(stderr, "%s\n", path);
perror("fopen");
return NULL;
}
}
static char *get_bootif(void)
{
#ifdef __linux__
#define PROC_CMDLINE "/proc/cmdline"
FILE *cmdline_file;
char *cmdline = NULL;
size_t dummy;
const char *s;
char *bootif = NULL;
/* Look for BOOTIF= entry in kernel command line. */
cmdline_file = file_open(PROC_CMDLINE, "r");
if (!cmdline_file) {
di_error("Failed to open " PROC_CMDLINE ": %s", strerror(errno));
return NULL;
}
if (getline(&cmdline, &dummy, cmdline_file) < 0) {
di_error("Failed to read line from " PROC_CMDLINE ": %s",
strerror(errno));
fclose(cmdline_file);
return NULL;
}
s = cmdline;
while ((s = strstr(s, "BOOTIF=")) != NULL) {
if (s == cmdline || s[-1] == ' ') {
size_t bootif_len;
char *subst;
s += sizeof("BOOTIF=") - 1;
bootif_len = strcspn(s, " ");
if (bootif_len != (ETH_ALEN * 3 - 1) + 3)
continue;
bootif = strndup(s + 3, bootif_len - 3); /* skip hardware type */
for (subst = bootif; *subst; subst++)
if (*subst == '-')
*subst = ':';
break;
}
s++;
}
free(cmdline);
fclose(cmdline_file);
if (!bootif)
di_info("Could not find valid BOOTIF= entry in " PROC_CMDLINE);
return bootif;
#undef PROC_CMDLINE
#else /* !__linux__ */
return NULL;
#endif /* __linux__ */
}
static unsigned char *parse_bootif(const char *bootif, int quiet)
{
int i;
const char *s;
unsigned char *bootif_addr = malloc(ETH_ALEN);
/* Parse supplied address. */
for (i = 0, s = bootif; i < ETH_ALEN && s; i++) {
unsigned long bootif_byte;
errno = 0;
bootif_byte = strtol(s, (char **) &s, 16);
if (errno || bootif_byte >= 256) {
if (!quiet)
di_error("couldn't parse link-layer address '%s'", bootif);
free(bootif_addr);
return NULL;
}
bootif_addr[i] = (unsigned char) bootif_byte;
if (i < ETH_ALEN - 1 && *s++ != ':') {
if (!quiet)
di_error("couldn't parse link-layer address '%s'", bootif);
free(bootif_addr);
return NULL;
}
}
return bootif_addr;
}
static char *find_bootif_iface(const char *bootif,
const unsigned char *bootif_addr)
{
#ifdef __GNU__
/* TODO: Use device_get_status(NET_ADDRESS), see pfinet/ethernet.c */
return NULL;
#else
struct ifaddrs *ifap, *ifa;
char *ret = NULL;
/* TODO: this won't work on the Hurd as getifaddrs doesn't return
* unconfigured interfaces. See comment to get_all_ifs.
*/
if (getifaddrs(&ifap) < 0) {
di_error("getifaddrs failed: %s", strerror(errno));
return NULL;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
#if defined(__FreeBSD_kernel__)
struct sockaddr_dl *sdl;
#else
struct sockaddr_ll *sll;
#endif
if (ifa->ifa_flags & IFF_LOOPBACK)
continue;
#if defined(__linux__)
if (!strncmp(ifa->ifa_name, "sit", 3)) /* ignore tunnel devices */
continue;
#endif
#if defined(WIRELESS)
if (is_raw_80211(ifa->ifa_name))
continue;
#endif
#if defined(__FreeBSD_kernel__)
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
sdl = (struct sockaddr_dl *) ifa->ifa_addr;
if (!sdl) /* no link-layer address */
continue;
if (sdl->sdl_alen != ETH_ALEN) /* not Ethernet */
continue;
if (memcmp(bootif_addr, LLADDR(sdl), ETH_ALEN) != 0)
continue;
#else
if (ifa->ifa_addr->sa_family != AF_PACKET)
continue;
sll = (struct sockaddr_ll *) ifa->ifa_addr;
if (!sll) /* no link-layer address */
continue;
if ((sll->sll_hatype != ARPHRD_ETHER &&
sll->sll_hatype != ARPHRD_IEEE802) ||
sll->sll_halen != ETH_ALEN) /* not Ethernet */
continue;
if (memcmp(bootif_addr, sll->sll_addr, ETH_ALEN) != 0)
continue;
#endif
di_info("Found interface %s with link-layer address %s",
ifa->ifa_name, bootif);
ret = strdup(ifa->ifa_name);
break;
}
freeifaddrs(ifap);
if (!ret)
di_error("Could not find any interface with address %s", bootif);
return ret;
#endif
}
void netcfg_die(struct debconfclient *client)
{
if (netcfg_progress_displayed)
debconf_progress_stop(client);
debconf_capb(client);
debconf_input(client, "high", "netcfg/error");
debconf_go(client);
exit(1);
}
/**
* @brief Ask which interface to configure
* @param client - client
* @param interface - set to the answer
* @param numif - number of interfaces found.
* @param defif - default interface from link detection.
*/
int netcfg_get_interface(struct debconfclient *client, char **interface,
int *numif, const char *defif)
{
char *inter = NULL, **ifs;
size_t len;
int ret, i, asked;
int num_interfaces = 0;
unsigned char *bootif_addr;
char *bootif_iface = NULL;
char *ptr = NULL;
char *ifdsc = NULL;
char *old_selection = NULL;
if (*interface) {
free(*interface);
*interface = NULL;
}
if (!(ptr = malloc(128)))
goto error;
len = 128;
*ptr = '\0';
num_interfaces = get_all_ifs(1, &ifs);
/* Remember old interface selection, in case it's preseeded. */
debconf_get(client, "netcfg/choose_interface");
old_selection = strdup(client->value);
/* If netcfg/choose_interface is preseeded to a link-layer address in
* the form aa:bb:cc:dd:ee:ff, or if BOOTIF is set and matches an
* interface, override any provided default from link detection. */
bootif_addr = parse_bootif(old_selection, 1);
if (bootif_addr) {
bootif_iface = find_bootif_iface(old_selection, bootif_addr);
if (bootif_iface) {
free(old_selection);
old_selection = strdup(bootif_iface);
}
free(bootif_addr);
} else {
char *bootif = get_bootif();
if (bootif) {
bootif_addr = parse_bootif(bootif, 0);
if (bootif_addr) {
bootif_iface = find_bootif_iface(bootif, bootif_addr);
free(bootif_addr);
}
free(bootif);
}
}
if (bootif_iface) {
/* Did we actually get back an interface we know about? */
for (i = 0; i < num_interfaces; i++) {
if (strcmp(ifs[i], bootif_iface) == 0) {
defif = ifs[i];
break;
}
}
free (bootif_iface);
}
/* If no default was provided, use the first in the list of interfaces. */
if (! defif && num_interfaces > 0) {
defif=ifs[0];
}
for (i = 0; i < num_interfaces; i++) {
size_t newchars;
char *temp = NULL;
inter = ifs[i];
interface_down(inter);
ifdsc = get_ifdsc(client, inter);
newchars = strlen(inter) + strlen(ifdsc) + 5; /* ": , " + NUL */
if (len < (strlen(ptr) + newchars)) {
if (!(ptr = realloc(ptr, len + newchars + 128)))
goto error;
len += newchars + 128;
}
temp = malloc(newchars);
snprintf(temp, newchars, "%s: %s", inter, ifdsc);
if (num_interfaces > 1 &&
((strcmp(defif, inter) == 0) || (strcmp(defif, temp) == 0)))
debconf_set(client, "netcfg/choose_interface", temp);
di_snprintfcat(ptr, len, "%s, ", temp);
free(temp);
free(ifdsc);
}
if (num_interfaces == 0) {
debconf_input(client, "high", "netcfg/no_interfaces");
ret = debconf_go(client);
free(ptr);
free(old_selection);
*numif = 0;
return ret;
}
else if (num_interfaces == 1) {
inter = ptr;
*numif = 1;
free(old_selection);
}
else if (num_interfaces > 1) {
*numif = num_interfaces;
/* remove the trailing ", ", which confuses cdebconf */
ptr[strlen(ptr) - 2] = '\0';
debconf_subst(client, "netcfg/choose_interface", "ifchoices", ptr);
free(ptr);
asked = (debconf_input(client, "critical", "netcfg/choose_interface") == 0);
ret = debconf_go(client);
/* If the question is not asked, honor preseeded interface name.
* However, if it was preseeded to "auto", or there was no old value,
* leave it set to defif. */
if (!asked && strlen(old_selection) && strcmp(old_selection, "auto") != 0) {
debconf_set(client, "netcfg/choose_interface", old_selection);
}
free(old_selection);
if (ret)
return ret;
debconf_get(client, "netcfg/choose_interface");
inter = client->value;
if (!inter)
netcfg_die(client);
}
/* grab just the interface name, not the description too */
*interface = inter;
/* Note that the question may be preseeded to just the interface name,
* with no colon after it. Allow for this case. */
ptr = strchr(inter, ':');
if (ptr != NULL) {
*ptr = '\0';
}
*interface = strdup(*interface);
/* Free allocated memory */
while (ifs && *ifs)
free(*ifs++);
return 0;
error:
if (ptr)
free(ptr);
netcfg_die(client);
return 10; /* unreachable */
}
/*
* Verify that the hostname conforms to RFC 1123 s2.1,
* and RFC 1034 s3.5.
* @return 1 on success, 0 on failure.
*/
short valid_hostname (const char *hname)
{
static const char *valid_chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
size_t len;
assert(hname != NULL);
len = strlen(hname);
if ((len < 1) ||
(len > MAXHOSTNAMELEN) ||
(strspn(hname, valid_chars) != len) ||
(hname[len - 1] == '-') ||
(hname[0] == '-')) {
return 0;
}
else
return 1;
}
/*
* Verify that the domain name (or FQDN) conforms to RFC 1123 s2.1, and
* RFC1034 s3.5.
* @return 1 on success, 0 on failure.
*/
short valid_domain (const char *dname)
{
static const char *valid_chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-.";
size_t len;
assert(dname != NULL);
len = strlen(dname);
if ((len < 1) ||
(len > MAXHOSTNAMELEN) ||
(strspn(dname, valid_chars) != len) ||
(dname[len - 1] == '-') ||
(dname[0] == '-') ||
(dname[len - 1] == '.') ||
(dname[0] == '.') ||
strstr(dname, "..")) {
return 0;
}
else
return 1;
}
/*
* Set the hostname.
* @return 0 on success, 30 on BACKUP being selected.
*/
int netcfg_get_hostname(struct debconfclient *client, char *template, char **hostname, short accept_domain)
{
int ret;
char *s, buf[1024];
for(;;) {
if (accept_domain)
have_domain = 0;
debconf_input(client, "high", template);
ret = debconf_go(client);
if (ret == 30) /* backup */
return ret;
debconf_get(client, template);
*hostname = strdup(client->value);
if (!valid_domain(*hostname)) {
di_info("%s is an invalid domain", *hostname);
debconf_subst(client, "netcfg/invalid_hostname",
"hostname", client->value);
snprintf(buf, sizeof(buf), "%i", MAXHOSTNAMELEN);
debconf_subst(client, "netcfg/invalid_hostname",
"maxhostnamelen", buf);
debconf_input(client, "high", "netcfg/invalid_hostname");
debconf_go(client);
debconf_set(client, template, "debian");
free(*hostname);
*hostname = NULL;
}
if (accept_domain && (s = strchr(*hostname, '.'))) {
di_info("Detected we have an FQDN; splitting and setting domain");
if (s[1] == '\0') { /* "somehostname." <- . should be ignored */
*s = '\0';
} else { /* assume we have a valid domain name given */
if (domain)
free(domain);
domain = strdup(s + 1);
debconf_set(client, "netcfg/get_domain", domain);
have_domain = 1;
*s = '\0';
}
}
if (!valid_hostname(*hostname)) {
di_info("%s is an invalid hostname", *hostname);
debconf_subst(client, "netcfg/invalid_hostname",
"hostname", client->value);
snprintf(buf, sizeof(buf), "%i", MAXHOSTNAMELEN);
debconf_subst(client, "netcfg/invalid_hostname",
"maxhostnamelen", buf);
debconf_input(client, "high", "netcfg/invalid_hostname");
debconf_go(client);
debconf_set(client, template, "debian");
free(*hostname);
*hostname = NULL;
} else {
break;
}
}
return 0;
}
/* @brief Get the domainname.
* @return 0 for success, with *domain = domain, 30 for 'goback',
*/
int netcfg_get_domain(struct debconfclient *client, char **domain)
{
int ret;
if (have_domain == 1)
{
debconf_get(client, "netcfg/get_domain");
assert (!empty_str(client->value));
if (*domain)
free(*domain);
*domain = strdup(client->value);
return 0;
}
debconf_input (client, "high", "netcfg/get_domain");
ret = debconf_go(client);
if (ret)
return ret;
debconf_get (client, "netcfg/get_domain");
if (*domain)
free(*domain);
*domain = NULL;
if (!empty_str(client->value)) {
const char *start = client->value;
while (*start == '.')
++start; /* trim leading dots */
*domain = strdup(start);
}
return 0;
}
void netcfg_write_loopback (void)
{
FILE *fp;
if ((fp = file_open(INTERFACES_FILE, "w"))) {
fprintf(fp, HELPFUL_COMMENT);
fprintf(fp, "\n# The loopback network interface\n");
fprintf(fp, "auto "LO_IF"\n");
fprintf(fp, "iface "LO_IF" inet loopback\n");
fclose(fp);
}
}