xref: /src/usr.sbin/sysinst/net.c

/*	$NetBSD: net.c,v 1.40 2022/01/13 14:47:11 nia Exp $	*/

/*
 * Copyright 1997 Piermont Information Systems Inc.
 * All rights reserved.
 *
 * Written by Philip A. Nelson for Piermont Information Systems Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of Piermont Information Systems Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/* net.c -- routines to fetch files off the network. */

#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/statvfs.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <net80211/ieee80211_ioctl.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curses.h>
#include <time.h>
#include <unistd.h>

#include "defs.h"
#include "md.h"
#include "msg_defs.h"
#include "menu_defs.h"
#include "txtwalk.h"

int network_up = 0;
/* Access to network information */
#define MAX_NETS 15
struct net_desc {
	char if_dev[STRSIZE];
	char name[STRSIZE]; // TODO
};

static char net_dev[STRSIZE];
static char net_domain[STRSIZE];
static char net_host[STRSIZE];
static char net_ip[SSTRSIZE];
static char net_srv_ip[SSTRSIZE];
static char net_mask[SSTRSIZE];
char net_namesvr[STRSIZE];
static char net_defroute[STRSIZE];
static char net_media[STRSIZE];
static char net_ssid[STRSIZE];
static char net_passphrase[STRSIZE];
static char sl_flags[STRSIZE];
static int net_dhcpconf;
#define DHCPCONF_IPADDR         0x01
#define DHCPCONF_NAMESVR        0x02
#define DHCPCONF_HOST           0x04
#define DHCPCONF_DOMAIN         0x08
#ifdef INET6
static char net_ip6[STRSIZE];
#define IP6CONF_AUTOHOST        0x01
#endif


/* URL encode unsafe characters.  */

static char *url_encode (char *dst, const char *src, const char *ep,
				const char *safe_chars,
				int encode_leading_slash);

static void write_etc_hosts(FILE *f);

#define DHCPCD "/sbin/dhcpcd"
#define WPA_SUPPLICANT "/usr/sbin/wpa_supplicant"
#include <signal.h>
static int config_eth_medium(char *);
static int config_dhcp(char *);
static int config_wlan(char *);

#ifdef INET6
static int is_v6kernel (void);
#endif

/*
 * URL encode unsafe characters.  See RFC 1738.
 *
 * Copies src string to dst, encoding unsafe or reserved characters
 * in %hex form as it goes, and returning a pointer to the result.
 * The result is always a nul-terminated string even if it had to be
 * truncated to avoid overflowing the available space.
 *
 * This url_encode() function does not operate on complete URLs, it
 * operates on strings that make up parts of URLs.  For example, in a
 * URL like "ftp://username:password@host/path", the username, password,
 * host and path should each be encoded separately before they are
 * joined together with the punctuation characters.
 *
 * In most ordinary use, the path portion of a URL does not start with
 * a slash; the slash is a separator between the host portion and the
 * path portion, and is dealt with by software outside the url_encode()
 * function.  However, it is valid for url_encode() to be passed a
 * string that does begin with a slash.  For example, the string might
 * represent a password, or a path part of a URL that the user really
 * does want to begin with a slash.
 *
 * len is the length of the destination buffer.  The result will be
 * truncated if necessary to fit in the destination buffer.
 *
 * safe_chars is a string of characters that should not be encoded.  If
 * safe_chars is non-NULL, any characters in safe_chars as well as any
 * alphanumeric characters will be copied from src to dst without
 * encoding.  Some potentially useful settings for this parameter are:
 *
 *	NULL		Everything is encoded (even alphanumerics)
 *	""		Everything except alphanumerics are encoded
 *	"/"		Alphanumerics and '/' remain unencoded
 *	"$-_.+!*'(),"	Consistent with a strict reading of RFC 1738
 *	"$-_.+!*'(),/"	As above, except '/' is not encoded
 *	"-_.+!,/"	As above, except shell special characters are encoded
 *
 * encode_leading_slash is a flag that determines whether or not to
 * encode a leading slash in a string.  If this flag is set, and if the
 * first character in the src string is '/', then the leading slash will
 * be encoded (as "%2F"), even if '/' is one of the characters in the
 * safe_chars string.  Note that only the first character of the src
 * string is affected by this flag, and that leading slashes are never
 * deleted, but either retained unchanged or encoded.
 *
 * Unsafe and reserved characters are defined in RFC 1738 section 2.2.
 * The most important parts are:
 *
 *      The characters ";", "/", "?", ":", "@", "=" and "&" are the
 *      characters which may be reserved for special meaning within a
 *      scheme. No other characters may be reserved within a scheme.
 *      [...]
 *
 *      Thus, only alphanumerics, the special characters "$-_.+!*'(),",
 *      and reserved characters used for their reserved purposes may be
 *      used unencoded within a URL.
 *
 */

#define RFC1738_SAFE				"$-_.+!*'(),"
#define RFC1738_SAFE_LESS_SHELL			"-_.+!,"
#define RFC1738_SAFE_LESS_SHELL_PLUS_SLASH	"-_.+!,/"

static char *
url_encode(char *dst, const char *src, const char *ep,
	const char *safe_chars, int encode_leading_slash)
{
	int ch;

	ep--;

	for (; dst < ep; src++) {
		ch = *src & 0xff;
		if (ch == 0)
			break;
		if (safe_chars != NULL &&
		    (ch != '/' || !encode_leading_slash) &&
		    (isalnum(ch) || strchr(safe_chars, ch))) {
			*dst++ = ch;
		} else {
			/* encode this char */
			if (ep - dst < 3)
				break;
			snprintf(dst, ep - dst, "%%%02X", ch);
			dst += 3;
		}
		encode_leading_slash = 0;
	}
	*dst = '\0';
	return dst;
}

static const char *ignored_if_names[] = {
	"gre",			/* net */
	"ipip",			/* netinet */
	"gif",			/* netinet6 */
	"faith",		/* netinet6 */
	"lo",			/* net */
	"lo0",			/* net */
#if 0
	"mdecap",		/* netinet -- never in IF list (?) XXX */
#endif
	"ppp",			/* net */
#if 0
	"sl",			/* net */
#endif
	"strip",		/* net */
	"tun",			/* net */
	/* XXX others? */
	NULL,
};

static int
get_ifconfig_info(struct net_desc *devs)
{
	char *buf_in;
	char *buf_tmp;
	const char **ignore;
	char *buf;
	char *tmp;
	int textsize;
	int i;

	/* Get ifconfig information */
	textsize = collect(T_OUTPUT, &buf_in, "/sbin/ifconfig -l 2>/dev/null");
	if (textsize < 0) {
		if (logfp)
			(void)fprintf(logfp,
			    "Aborting: Could not run ifconfig.\n");
		(void)fprintf(stderr, "Could not run ifconfig.");
		exit(1);
	}

	buf = malloc (STRSIZE * sizeof(char));
	for (i = 0, buf_tmp = buf_in; i < MAX_NETS && strlen(buf_tmp) > 0
	    && buf_tmp < buf_in + strlen(buf_in);) {
		tmp = stpncpy(buf, buf_tmp, strcspn(buf_tmp," \n"));
		*tmp='\0';
		buf_tmp += (strcspn(buf_tmp, " \n") + 1) * sizeof(char);

		/* Skip ignored interfaces */
		for (ignore = ignored_if_names; *ignore != NULL; ignore++) {
			size_t len = strlen(*ignore);
			if (strncmp(buf, *ignore, len) == 0 &&
			    isdigit((unsigned char)buf[len]))
				break;
		}
		if (*ignore != NULL)
			continue;

		strlcpy (devs[i].if_dev, buf, STRSIZE);
		i++;
	}
	if (i < MAX_NETS)
		devs[i].if_dev[0] = 0;	/* XXX ? */

	free(buf);
	free(buf_in);
	return i;
}

static int
do_ifreq(struct ifreq *ifr, unsigned long cmd, void *data)
{
	int sock;
	int rval;

	sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (sock == -1)
		return -1;

	memset(ifr, 0, sizeof *ifr);
	ifr->ifr_data = data;
	strlcpy(ifr->ifr_name, net_dev, sizeof ifr->ifr_name);
	rval = ioctl(sock, cmd, ifr);
	close(sock);

	return rval;
}

static int
do_ifmreq(struct ifmediareq *ifmr, unsigned long cmd)
{
	int sock;
	int rval;

	sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (sock == -1)
		return -1;

	memset(ifmr, 0, sizeof *ifmr);
	strlcpy(ifmr->ifm_name, net_dev, sizeof ifmr->ifm_name);
	rval = ioctl(sock, cmd, ifmr);
	close(sock);

	return rval;
}

/* Fill in defaults network values for the selected interface */
static void
get_ifinterface_info(void)
{
	struct ifreq ifr;
	struct ifmediareq ifmr;
	struct sockaddr_in *sa_in = (void*)&ifr.ifr_addr;
	int modew;
	const char *media_opt;
	const char *sep;

	if (do_ifreq(&ifr, SIOCGIFADDR, NULL) == 0 &&
	    sa_in->sin_addr.s_addr != 0)
		strlcpy(net_ip, inet_ntoa(sa_in->sin_addr), sizeof net_ip);

	if (do_ifreq(&ifr, SIOCGIFNETMASK, NULL) == 0 &&
	    sa_in->sin_addr.s_addr != 0)
		strlcpy(net_mask, inet_ntoa(sa_in->sin_addr), sizeof net_mask);

	if (do_ifmreq(&ifmr, SIOCGIFMEDIA) == 0) {
		/* Get the name of the media word */
		modew = ifmr.ifm_current;
		strlcpy(net_media, get_media_subtype_string(modew),
		    sizeof net_media);
		/* and add any media options */
		sep = " mediaopt ";
		while ((media_opt = get_media_option_string(&modew)) != NULL) {
			strlcat(net_media, sep, sizeof net_media);
			strlcat(net_media, media_opt, sizeof net_media);
			sep = ",";
		}
	}
}

#ifndef INET6
#define get_if6interface_info()
#else
static void
get_if6interface_info(void)
{
	char *textbuf, *t;
	int textsize;

	textsize = collect(T_OUTPUT, &textbuf,
	    "/sbin/ifconfig %s inet6 2>/dev/null", net_dev);
	if (textsize >= 0) {
		char *p;

		(void)strtok(textbuf, "\n"); /* ignore first line */
		while ((t = strtok(NULL, "\n")) != NULL) {
			if (strncmp(t, "\tinet6 ", 7) != 0)
				continue;
			t += 7;
			if (strstr(t, "tentative") || strstr(t, "duplicated"))
				continue;
			if (strncmp(t, "fe80:", 5) == 0)
				continue;

			p = t;
			while (*p && *p != ' ' && *p != '\n')
				p++;
			*p = '\0';
			strlcpy(net_ip6, t, sizeof(net_ip6));
			break;
		}
	}
	free(textbuf);
}
#endif

static void
get_host_info(void)
{
	char hostname[MAXHOSTNAMELEN + 1];
	char *dot;

	/* Check host (and domain?) name */
	if (gethostname(hostname, sizeof(hostname)) == 0 && hostname[0] != 0) {
		hostname[sizeof(hostname) - 1] = 0;
		/* check for a . */
		dot = strchr(hostname, '.');
		if (dot == NULL) {
			/* if not found its just a host, punt on domain */
			strlcpy(net_host, hostname, sizeof net_host);
		} else {
			/* split hostname into host/domain parts */
			*dot++ = 0;
			strlcpy(net_host, hostname, sizeof net_host);
			strlcpy(net_domain, dot, sizeof net_domain);
		}
	}
}

/*
 * recombine name parts split in get_host_info and config_network
 * (common code moved here from write_etc_hosts)
 */
static char *
recombine_host_domain(void)
{
	static char recombined[MAXHOSTNAMELEN + 1];
	int l = strlen(net_host) - strlen(net_domain);

	strlcpy(recombined, net_host, sizeof(recombined));

	if (strlen(net_domain) != 0 && (l <= 0 ||
	    net_host[l - 1] != '.' ||
	    strcasecmp(net_domain, net_host + l) != 0)) {
		/* net_host isn't an FQDN. */
		strlcat(recombined, ".", sizeof(recombined));
		strlcat(recombined, net_domain, sizeof(recombined));
	}
	return recombined;
}

#ifdef INET6
static int
is_v6kernel(void)
{
	int s;

	s = socket(PF_INET6, SOCK_DGRAM, 0);
	if (s < 0)
		return 0;
	close(s);
	return 1;
}
#endif

static int
handle_license(const char *dev)
{
	static struct {
		const char *dev;
		const char *lic;
	} licdev[] = {
		{ "iwi", "/libdata/firmware/if_iwi/LICENSE.ipw2200-fw" },
		{ "ipw", "/libdata/firmware/if_ipw/LICENSE" },
	};

	size_t i;

	for (i = 0; i < __arraycount(licdev); i++)
		if (strncmp(dev, licdev[i].dev, 3) == 0) {
			char buf[64];
			int val;
			size_t len = sizeof(int);
			(void)snprintf(buf, sizeof(buf), "hw.%s.accept_eula",
			    licdev[i].dev);
			if (sysctlbyname(buf, &val, &len, NULL, 0) != -1
			    && val != 0)
				return 1;
			msg_fmt_display(MSG_license, "%s%s",
			    dev, licdev[i].lic);
			if (ask_yesno(NULL)) {
				val = 1;
				if (sysctlbyname(buf, NULL, NULL, &val,
				    0) == -1)
					return 0;
				add_sysctl_conf("%s=1", buf);
				return 1;
			} else
				return 0;
		}
	return 1;
}

/*
 * Get the information to configure the network, configure it and
 * make sure both the gateway and the name server are up.
 */
int
config_network(void)
{
	char *textbuf;
	int  octet0;
	int  dhcp_config;
	int  nfs_root = 0;
 	int  slip = 0;
 	int  pid, status;
 	char **ap, *slcmd[10], *in_buf;
 	char buffer[STRSIZE];
 	struct statvfs sb;
	struct net_desc net_devs[MAX_NETS];
	menu_ent *net_menu;
	int menu_no;
	int num_devs;
	int selected_net;
	int i;
#ifdef INET6
	int v6config = 1, rv;
#endif

	FILE *f;
	time_t now;

	if (network_up)
		return (1);

	num_devs = get_ifconfig_info(net_devs);

	if (num_devs < 1) {
		/* No network interfaces found! */
		hit_enter_to_continue(NULL, MSG_nonet);
		return -1;
	}

	net_menu = calloc(num_devs, sizeof(*net_menu));
	if (net_menu == NULL) {
		err_msg_win(err_outofmem);
		return -1;
	}

	for (i = 0; i < num_devs; i++) {
		net_menu[i].opt_name = net_devs[i].if_dev;
		net_menu[i].opt_flags = OPT_EXIT;
		net_menu[i].opt_action = set_menu_select;
	}

	menu_no = new_menu(MSG_netdevs,
		net_menu, num_devs, -1, 4, 0, 0,
		MC_SCROLL,
		NULL, NULL, NULL, NULL, MSG_cancel);
again:
	selected_net = -1;
	msg_display(MSG_asknetdev);
	process_menu(menu_no, &selected_net);

	if (selected_net == -1) {
		free_menu(menu_no);
		free(net_menu);
		return 0;
	}

	network_up = 1;
	dhcp_config = 0;

	strlcpy(net_dev, net_devs[selected_net].if_dev, sizeof net_dev);

	if (!handle_license(net_dev))
		goto done;

	slip = net_dev[0] == 's' && net_dev[1] == 'l' &&
	    isdigit((unsigned char)net_dev[2]);

	/* If root is on NFS do not reconfigure the interface. */
	if (statvfs("/", &sb) == 0 && strcmp(sb.f_fstypename, "nfs") == 0) {
		nfs_root = 1;
		get_ifinterface_info();
		get_if6interface_info();
		get_host_info();
	} else if (!slip) {
		/* Preload any defaults we can find */
		get_ifinterface_info();
		get_if6interface_info();
		get_host_info();

		/* domain and host */
		msg_display(MSG_netinfo);

		if (!config_wlan(net_dev)) {
			config_eth_medium(net_dev);
		}

		net_dhcpconf = 0;
		/* try a dhcp configuration */
		dhcp_config = config_dhcp(net_dev);
		if (dhcp_config) {
			char *nline;

			/* Get newly configured data off interface. */
			get_ifinterface_info();
			get_if6interface_info();
			get_host_info();

			net_dhcpconf |= DHCPCONF_IPADDR;

			/*
			 * Extract default route from output of
			 * 'route -n show'
			 */
			if (collect(T_OUTPUT, &textbuf,
			    "/sbin/route -n show | "
			    "while read dest gateway flags;"
			    " do [ \"$dest\" = default ] && {"
			    " echo \"$gateway\"; break; };"
			    " done" ) > 0)
				strlcpy(net_defroute, textbuf,
				    sizeof net_defroute);
			free(textbuf);
			if ((nline = strchr(net_defroute, '\n')))
				*nline = '\0';

			/* pull nameserver info out of /etc/resolv.conf */
			if (collect(T_OUTPUT, &textbuf,
			    "cat /etc/resolv.conf 2>/dev/null |"
			    " while read keyword address rest;"
			    " do [ \"$keyword\" = nameserver ] &&"
			    " { echo \"$address\"; break; };"
			    " done" ) > 0)
				strlcpy(net_namesvr, textbuf,
				    sizeof net_namesvr);
			free(textbuf);
			if ((nline = strchr(net_namesvr, '\n')))
				*nline = '\0';
			if (net_namesvr[0] != '\0')
				net_dhcpconf |= DHCPCONF_NAMESVR;

			/* pull domain info out of /etc/resolv.conf */
			if (collect(T_OUTPUT, &textbuf,
			    "cat /etc/resolv.conf 2>/dev/null |"
			    " while read keyword domain rest;"
			    " do [ \"$keyword\" = domain ] &&"
			    " { echo \"$domain\"; break; };"
			    " done" ) > 0)
				strlcpy(net_domain, textbuf,
				    sizeof net_domain);
			free(textbuf);
			if (net_domain[0] == '\0') {
				/* pull domain info out of /etc/resolv.conf */
				if (collect(T_OUTPUT, &textbuf,
				    "cat /etc/resolv.conf 2>/dev/null |"
				    " while read keyword search rest;"
				    " do [ \"$keyword\" = search ] &&"
				    " { echo \"$search\"; break; };"
				    " done" ) > 0)
					strlcpy(net_domain, textbuf,
					    sizeof net_domain);
				free(textbuf);
			}
			if ((nline = strchr(net_domain, '\n')))
				*nline = '\0';
			if (net_domain[0] != '\0')
				net_dhcpconf |= DHCPCONF_DOMAIN;

			if (gethostname(net_host, sizeof(net_host)) == 0 &&
			    net_host[0] != 0)
				net_dhcpconf |= DHCPCONF_HOST;
		}
	}

	if (!(net_dhcpconf & DHCPCONF_HOST))
		msg_prompt_add(MSG_net_host, net_host, net_host,
		    sizeof net_host);

	if (!(net_dhcpconf & DHCPCONF_DOMAIN))
		msg_prompt_add(MSG_net_domain, net_domain, net_domain,
		    sizeof net_domain);

	if (!dhcp_config) {
		/* Manually configure IPv4 */
		if (!nfs_root)
			msg_prompt_add(MSG_net_ip, net_ip, net_ip,
			    sizeof net_ip);
		if (slip)
			msg_prompt_add(MSG_net_srv_ip, net_srv_ip, net_srv_ip,
			    sizeof net_srv_ip);
		else if (!nfs_root) {
			/* We don't want netmasks for SLIP */
			octet0 = atoi(net_ip);
			if (!net_mask[0]) {
				if (0 <= octet0 && octet0 <= 127)
					strlcpy(net_mask, "0xff000000",
				    	sizeof(net_mask));
				else if (128 <= octet0 && octet0 <= 191)
					strlcpy(net_mask, "0xffff0000",
				    	sizeof(net_mask));
				else if (192 <= octet0 && octet0 <= 223)
					strlcpy(net_mask, "0xffffff00",
				    	sizeof(net_mask));
			}
			msg_prompt_add(MSG_net_mask, net_mask, net_mask,
			    sizeof net_mask);
		}
		msg_prompt_add(MSG_net_defroute, net_defroute, net_defroute,
		    sizeof net_defroute);
	}

	if (!(net_dhcpconf & DHCPCONF_NAMESVR)) {
#ifdef INET6
		if (v6config) {
			rv = 0;
			process_menu(MENU_namesrv6, &rv);
			if (!rv)
				msg_prompt_add(MSG_net_namesrv, net_namesvr,
				    net_namesvr, sizeof net_namesvr);
		} else
#endif
		msg_prompt_add(MSG_net_namesrv, net_namesvr, net_namesvr,
		    sizeof net_namesvr);
	}

	/* confirm the setting */
	msg_clear();
	if (slip)
		msg_fmt_table_add(MSG_netok_slip, "%s%s%s%s%s%s%s%s%s",
		    net_domain,
		    net_host,
		    *net_namesvr == '\0' ? "<none>" : net_namesvr,
		    net_dev,
		    *net_media == '\0' ? "<default>" : net_media,
		    *net_ip == '\0' ? "<none>" : net_ip,
		    *net_srv_ip == '\0' ? "<none>" : net_srv_ip,
		    *net_mask == '\0' ? "<none>" : net_mask,
		    *net_defroute == '\0' ? "<none>" : net_defroute);
	else
		msg_fmt_table_add(MSG_netok, "%s%s%s%s%s%s%s%s",
		    net_domain,
		    net_host,
		    *net_namesvr == '\0' ? "<none>" : net_namesvr,
		    net_dev,
		    *net_media == '\0' ? "<default>" : net_media,
		    *net_ip == '\0' ? "<none>" : net_ip,
		    *net_mask == '\0' ? "<none>" : net_mask,
		    *net_defroute == '\0' ? "<none>" : net_defroute);
#ifdef INET6
	msg_fmt_table_add(MSG_netokv6, "%s",
		     !is_v6kernel() ? "<not supported>" : net_ip6);
#endif
done:
	if (!ask_yesno(MSG_netok_ok))
		goto again;

	free_menu(menu_no);
	free(net_menu);

	run_program(0, "/sbin/ifconfig lo0 127.0.0.1");

	/* dhcpcd will have configured it all for us */
	if (dhcp_config) {
		fflush(NULL);
		network_up = 1;
		return network_up;
	}

	/*
	 * we may want to perform checks against inconsistent configuration,
	 * like IPv4 DNS server without IPv4 configuration.
	 */

	/* Create /etc/resolv.conf if a nameserver was given */
	if (net_namesvr[0] != '\0') {
		f = fopen("/etc/resolv.conf", "w");
		if (f == NULL) {
			if (logfp)
				(void)fprintf(logfp,
				    "%s", msg_string(MSG_resolv));
			(void)fprintf(stderr, "%s", msg_string(MSG_resolv));
			exit(1);
		}
		scripting_fprintf(NULL, "cat <<EOF >/etc/resolv.conf\n");
		time(&now);
		scripting_fprintf(f, ";\n; BIND data file\n; %s %s;\n",
		    "Created by NetBSD sysinst on", safectime(&now));
		if (net_domain[0] != '\0')
			scripting_fprintf(f, "search %s\n", net_domain);
		if (net_namesvr[0] != '\0')
			scripting_fprintf(f, "nameserver %s\n", net_namesvr);
		scripting_fprintf(NULL, "EOF\n");
		fflush(NULL);
		fclose(f);
	}

	if (net_ip[0] != '\0') {
		if (slip) {
			/* XXX: needs 'ifconfig sl0 create' much earlier */
			/* Set SLIP interface UP */
			run_program(0, "/sbin/ifconfig %s inet %s %s up",
			    net_dev, net_ip, net_srv_ip);
			strcpy(sl_flags, "-s 115200 -l /dev/tty00");
			msg_prompt_win(MSG_slattach, -1, 12, 70, 0,
				sl_flags, sl_flags, sizeof sl_flags);

			/* XXX: wtf isn't run_program() used here? */
			pid = fork();
			if (pid == 0) {
				strcpy(buffer, "/sbin/slattach ");
				strcat(buffer, sl_flags);
				in_buf = buffer;

				for (ap = slcmd; (*ap = strsep(&in_buf, " ")) != NULL;)
				if (**ap != '\0')
					++ap;

				execvp(slcmd[0], slcmd);
			} else
				wait4(pid, &status, WNOHANG, 0);
		} else if (!nfs_root) {
			if (net_mask[0] != '\0') {
				run_program(0, "/sbin/ifconfig %s inet %s netmask %s",
				    net_dev, net_ip, net_mask);
			} else {
				run_program(0, "/sbin/ifconfig %s inet %s",
			    	net_dev, net_ip);
			}
		}
	}

	/* Set host name */
	if (net_host[0] != '\0')
	  	sethostname(net_host, strlen(net_host));

	/* Set a default route if one was given */
	if (!nfs_root && net_defroute[0] != '\0') {
		run_program(RUN_DISPLAY | RUN_PROGRESS,
				"/sbin/route -n flush -inet");
		run_program(RUN_DISPLAY | RUN_PROGRESS,
				"/sbin/route -n add default %s", net_defroute);
	}

	/*
	 * wait for addresses to become valid
	 */
	if (!nfs_root) {
		msg_display_add(MSG_wait_network);
		network_up = !run_program(RUN_DISPLAY | RUN_PROGRESS,
		    "/sbin/ifconfig -w 15 -W 5");
	} else {
		/* Assume network is up. */
		network_up = 1;
	}

	fflush(NULL);

	return network_up;
}

const char *
url_proto(unsigned int xfer)
{
	switch (xfer) {
	case XFER_FTP:	return "ftp";
	case XFER_HTTP:	return "http";
	}

	return "";
}

void
make_url(char *urlbuffer, struct ftpinfo *f, const char *dir)
{
	char ftp_user_encoded[STRSIZE];
	char ftp_dir_encoded[STRSIZE];
	char *cp;
	const char *dir2;

	/*
	 * f->pass is quite likely to contain unsafe characters
	 * that need to be encoded in the URL (for example,
	 * "@", ":" and "/" need quoting).  Let's be
	 * paranoid and also encode f->user and f->dir.  (For
	 * example, f->dir could easily contain '~', which is
	 * unsafe by a strict reading of RFC 1738).
	 */
	if (strcmp("ftp", f->user) == 0 && f->pass[0] == 0) {
		ftp_user_encoded[0] = 0;
	} else {
		cp = url_encode(ftp_user_encoded, f->user,
			ftp_user_encoded + sizeof ftp_user_encoded - 1,
			RFC1738_SAFE_LESS_SHELL, 0);
		*cp++ = ':';
		cp = url_encode(cp, f->pass,
			ftp_user_encoded + sizeof ftp_user_encoded - 1,
			NULL, 0);
		*cp++ = '@';
		*cp = 0;
	}
	cp = url_encode(ftp_dir_encoded, f->dir,
			ftp_dir_encoded + sizeof ftp_dir_encoded - 1,
			RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 1);
	if (cp != ftp_dir_encoded && cp[-1] != '/')
		*cp++ = '/';

	dir2 = dir;
	while (*dir2 == '/')
		++dir2;

	url_encode(cp, dir2,
			ftp_dir_encoded + sizeof ftp_dir_encoded,
			RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 0);

	snprintf(urlbuffer, STRSIZE, "%s://%s%s/%s", url_proto(f->xfer),
	    ftp_user_encoded, f->xfer_host[f->xfer], ftp_dir_encoded);
}


/* ftp_fetch() and pkgsrc_fetch() are essentially the same, with a different
 * ftpinfo var and pkgsrc always using .tgz suffix, while for
 * regular sets we only use .tgz for source sets on some architectures. */
static int do_ftp_fetch(const char *, bool, struct ftpinfo *);

static int
ftp_fetch(const char *set_name)
{
	return do_ftp_fetch(set_name, use_tgz_for_set(set_name), &ftp);
}

static int
pkgsrc_fetch(const char *set_name)
{
	return do_ftp_fetch(set_name, true, &pkgsrc);
}

static int
do_ftp_fetch(const char *set_name, bool force_tgz, struct ftpinfo *f)
{
	const char *ftp_opt;
	char url[STRSIZE];
	int rval;

	/*
	 * Invoke ftp to fetch the file.
	 */
	if (strcmp("ftp", f->user) == 0 && f->pass[0] == 0) {
		/* do anon ftp */
		ftp_opt = "-a ";
	} else {
		ftp_opt = "";
	}

	make_url(url, f, set_dir_for_set(set_name));
	rval = run_program(RUN_DISPLAY | RUN_PROGRESS | RUN_XFER_DIR,
		    "/usr/bin/ftp %s%s/%s%s",
		    ftp_opt, url, set_name,
		    force_tgz ? dist_tgz_postfix : dist_postfix);

	return rval ? SET_RETRY : SET_OK;
}


// XXX: check MSG_netnotup_continueanyway and MSG_netnotup

int
get_pkgsrc(void)
{
	int rv = -1;

	process_menu(MENU_pkgsrc, &rv);

	if (rv == SET_SKIP)
		return SET_SKIP;

	fetch_fn = pkgsrc_fetch;
	snprintf(ext_dir_pkgsrc, sizeof ext_dir_pkgsrc, "%s/%s",
	    target_prefix(), xfer_dir + (*xfer_dir == '/'));

	return SET_OK;
}

int
get_via_ftp(unsigned int xfer)
{
	arg_rv arg;

	arg.rv = -1;
	arg.arg = (void*)(uintptr_t)(xfer);
	process_menu(MENU_ftpsource, &arg);

	if (arg.rv == SET_RETRY)
		return SET_RETRY;

	/* We'll fetch each file just before installing it */
	fetch_fn = ftp_fetch;
	ftp.xfer = xfer;
	snprintf(ext_dir_bin, sizeof ext_dir_bin, "%s/%s", target_prefix(),
	    xfer_dir + (*xfer_dir == '/'));
	snprintf(ext_dir_src, sizeof ext_dir_src, "%s/%s", target_prefix(),
	    xfer_dir + (*xfer_dir == '/'));

	return SET_OK;
}

int
get_via_nfs(void)
{
	struct statvfs sb;
	int rv;

	/* If root is on NFS and we have sets, skip this step. */
	if (statvfs(set_dir_bin, &sb) == 0 &&
	    strcmp(sb.f_fstypename, "nfs") == 0) {
	    	strlcpy(ext_dir_bin, set_dir_bin, sizeof ext_dir_bin);
	    	strlcpy(ext_dir_src, set_dir_src, sizeof ext_dir_src);
		return SET_OK;
	}

	/* Get server and filepath */
	rv = -1;
	process_menu(MENU_nfssource, &rv);

	if (rv == SET_RETRY)
		return SET_RETRY;

	/* Mount it */
	if (run_program(0, "/sbin/mount -r -o -2,-i,-r=1024 -t nfs %s:%s /mnt2",
	    nfs_host, nfs_dir))
		return SET_RETRY;

	mnt2_mounted = 1;

	snprintf(ext_dir_bin, sizeof ext_dir_bin, "/mnt2/%s", set_dir_bin);
	snprintf(ext_dir_src, sizeof ext_dir_src, "/mnt2/%s", set_dir_src);

	/* return location, don't clean... */
	return SET_OK;
}

/*
 * write the new contents of /etc/hosts to the specified file
 */
static void
write_etc_hosts(FILE *f)
{
	scripting_fprintf(f, "#\n");
	scripting_fprintf(f, "# Added by NetBSD sysinst\n");
	scripting_fprintf(f, "#\n");

	if (net_domain[0] != '\0')
		scripting_fprintf(f, "127.0.0.1	localhost.%s\n", net_domain);

	scripting_fprintf(f, "%s\t", net_ip);
	if (net_domain[0] != '\0')
		scripting_fprintf(f, "%s ", recombine_host_domain());
	scripting_fprintf(f, "%s\n", net_host);
}

/*
 * Write the network config info the user entered via menus into the
 * config files in the target disk.  Be careful not to lose any
 * information we don't immediately add back, in case the install
 * target is the currently-active root.
 */
void
mnt_net_config(void)
{
	char ifconfig_fn[STRSIZE];
	FILE *ifconf = NULL;

	if (!network_up)
		return;
	if (!ask_yesno(MSG_mntnetconfig))
		return;

	/* Write hostname to /etc/rc.conf */
	if ((net_dhcpconf & DHCPCONF_HOST) == 0)
		if (del_rc_conf("hostname") == 0)
			add_rc_conf("hostname=%s\n", recombine_host_domain());

	/* Copy resolv.conf to target.  If DHCP was used to create it,
	 * it will be replaced on next boot anyway. */
	if (net_namesvr[0] != '\0')
		dup_file_into_target("/etc/resolv.conf");

	/* Copy wpa_supplicant.conf to target. */
	if (net_ssid[0] != '\0')
		dup_file_into_target("/etc/wpa_supplicant.conf");

	/*
	 * bring the interface up, it will be necessary for IPv6, and
	 * it won't make trouble with IPv4 case either
	 */
	snprintf(ifconfig_fn, sizeof ifconfig_fn, "/etc/ifconfig.%s", net_dev);
	ifconf = target_fopen(ifconfig_fn, "w");
	if (ifconf != NULL) {
		scripting_fprintf(NULL, "cat <<EOF >>%s%s\n",
		    target_prefix(), ifconfig_fn);
		scripting_fprintf(ifconf, "up\n");
		if (*net_media != '\0')
			scripting_fprintf(ifconf, "media %s\n", net_media);
		scripting_fprintf(NULL, "EOF\n");
	}

	if ((net_dhcpconf & DHCPCONF_IPADDR) == 0) {
		FILE *hosts;

		/* Write IPaddr and netmask to /etc/ifconfig.if[0-9] */
		if (ifconf != NULL) {
			scripting_fprintf(NULL, "cat <<EOF >>%s%s\n",
			    target_prefix(), ifconfig_fn);
			if (*net_media != '\0')
				scripting_fprintf(ifconf,
				    "%s netmask %s media %s\n",
				    net_ip, net_mask, net_media);
			else
				scripting_fprintf(ifconf, "%s netmask %s\n",
				    net_ip, net_mask);
			scripting_fprintf(NULL, "EOF\n");
		}

		/*
		 * Add IPaddr/hostname to  /etc/hosts.
		 * Be careful not to clobber any existing contents.
		 * Relies on ordered search of /etc/hosts. XXX YP?
		 */
		hosts = target_fopen("/etc/hosts", "a");
		if (hosts != 0) {
			scripting_fprintf(NULL, "cat <<EOF >>%s/etc/hosts\n",
			    target_prefix());
			write_etc_hosts(hosts);
			(void)fclose(hosts);
			scripting_fprintf(NULL, "EOF\n");
		}

		if (del_rc_conf("defaultroute") == 0)
			add_rc_conf("defaultroute=\"%s\"\n", net_defroute);
	} else {
		/*
		 * Start dhcpcd quietly and in master mode, but restrict
		 * it to our interface
		 */
		add_rc_conf("dhcpcd=YES\n");
		add_rc_conf("dhcpcd_flags=\"-qM %s\"\n", net_dev);
        }

	if (net_ssid[0] != '\0') {
		add_rc_conf("wpa_supplicant=YES\n");
		add_rc_conf("wpa_supplicant_flags=\"-B -s -i %s -D bsd -c /etc/wpa_supplicant.conf\"\n", net_dev);
	}

	if (ifconf)
		fclose(ifconf);

	fflush(NULL);
}

int
config_wlan(char *inter)
{
	FILE *wpa_conf = NULL;
	char wpa_cmd[256];
	struct ifreq ifr = {0};
	struct ieee80211_nwid nwid = {0};

	/* skip non-WLAN devices */
	if (do_ifreq(&ifr, SIOCG80211NWID, &nwid) == -1)
		return 0;

	if (!file_mode_match(WPA_SUPPLICANT, S_IFREG))
		return 0;

	msg_prompt_add(MSG_net_ssid, net_ssid, net_ssid,
			sizeof net_ssid);
	if (net_ssid[0] == '\0')
		return 0;

	msg_prompt_noecho(MSG_net_passphrase, net_passphrase, net_passphrase,
			sizeof net_passphrase);

	wpa_conf = fopen("/etc/wpa_supplicant.conf", "a");
	if (wpa_conf == NULL)
		return 0;

	scripting_fprintf(NULL,
	    "cat <<EOF >>%s/etc/wpa_supplicant.conf\n",
	    target_prefix());
	scripting_fprintf(wpa_conf, "\n#\n");
	scripting_fprintf(wpa_conf, "# Added by NetBSD sysinst\n");
	scripting_fprintf(wpa_conf, "#\n");
	scripting_fprintf(wpa_conf, "network={\n");
	scripting_fprintf(wpa_conf,
	    "\tssid=\"%s\"\n", net_ssid);
	if (net_passphrase[0] != '\0') {
		scripting_fprintf(wpa_conf, "\tpsk=\"%s\"\n",
		    net_passphrase);
	} else {
		scripting_fprintf(wpa_conf, "\tkey_mgmt=NONE\n");
	}
	scripting_fprintf(wpa_conf, "\tscan_ssid=1\n");
	scripting_fprintf(wpa_conf, "}\n");
	(void)fclose(wpa_conf);
	scripting_fprintf(NULL, "EOF\n");

	if (run_program(RUN_DISPLAY | RUN_PROGRESS,
	    "/sbin/ifconfig %s up", inter) != 0)
		return 0;

	/*
	 * have to use system() here to avoid the server process dying
	 */
	if (snprintf(wpa_cmd, sizeof(wpa_cmd),
	    WPA_SUPPLICANT
	    " -B -s -i %s -D bsd -c /etc/wpa_supplicant.conf", inter) < 0)
		return 0;
	(void)do_system(wpa_cmd);

	return 1;
}

int
config_dhcp(char *inter)
{
	int dhcpautoconf;

	/*
	 * Don't bother checking for an existing instance of dhcpcd, just
	 * ask it to renew the lease.  It will fork and daemonize if there
	 * wasn't already an instance.
	 */

	if (!file_mode_match(DHCPCD, S_IFREG))
		return 0;
	if (ask_yesno(MSG_Perform_autoconfiguration)) {
		/* spawn off dhcpcd and wait for parent to exit */
		dhcpautoconf = run_program(RUN_DISPLAY | RUN_PROGRESS,
		    "%s -d -n %s", DHCPCD, inter);
		return dhcpautoconf ? 0 : 1;
	}
	return 0;
}


int
config_eth_medium(char *inter)
{
	char *textbuf = NULL;

	for (;;) {
		msg_prompt_add(MSG_net_media, net_media, net_media,
				sizeof net_media);

		/*
		 * ifconfig does not allow media specifiers on
		 * IFM_MANUAL interfaces.  Our UI gives no way
		 * to set an option back
		 * to null-string if it gets accidentally set.
		 * Check for plausible alternatives.
		 */
		if (strcmp(net_media, "<default>") == 0 ||
		    strcmp(net_media, "default") == 0 ||
		    strcmp(net_media, "<manual>") == 0 ||
		    strcmp(net_media, "manual") == 0 ||
		    strcmp(net_media, "<none>") == 0 ||
		    strcmp(net_media, "none") == 0 ||
		    strcmp(net_media, " ") == 0) {
			*net_media = '\0';
		}

		if (*net_media == '\0')
			break;
		/*
		 * We must set the media type here - to give dhcp
		 * a chance
		 */
		if (run_program(0, "/sbin/ifconfig %s media %s",
			    net_dev, net_media) == 0)
			break;
		/* Failed to set - output the supported values */
		if (collect(T_OUTPUT, &textbuf, "/sbin/ifconfig -m %s |"
			    "while IFS=; read line;"
			    " do [ \"$line\" = \"${line#*media}\" ] || "
			    "echo $line;"
			    " done", net_dev ) > 0)
			msg_display(textbuf);
		free(textbuf);
	}
	return 0;
}