5bc001833f
ifconfig, essentially stealing the lease until the user goes and changes it. The alternative, sadly, is total dysfunction since bpf isn't in GENERIC and network connectivity would otherwise fail completely on first bootup when DHCP configuration was attempted again. The ultimate answer here is to make either bpf a loadable kernel module (which security conscious admins will be able to simply remove from /modules) or come up with a lighter weight mechanism just for dhcp and other apps that need to see broadcast packets but not otherwise sniff the wire in full bpf glory.
487 lines
15 KiB
C
487 lines
15 KiB
C
/*
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* $Id: tcpip.c,v 1.85 1999/07/19 11:00:56 jkh Exp $
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*
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* Copyright (c) 1995
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* Gary J Palmer. All rights reserved.
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* Copyright (c) 1996
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* Jordan K. Hubbard. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* verbatim and that no modifications are made prior to this
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* point in the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, LIFE OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* All kinds of hacking also performed by jkh on this code. Don't
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* blame Gary for every bogosity you see here.. :-)
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*
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* -jkh
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*/
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#include "sysinstall.h"
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#include <sys/param.h>
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#include <netdb.h>
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/* The help file for the TCP/IP setup screen */
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#define TCP_HELPFILE "tcp"
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/* These are nasty, but they make the layout structure a lot easier ... */
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static char hostname[HOSTNAME_FIELD_LEN], domainname[HOSTNAME_FIELD_LEN],
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gateway[IPADDR_FIELD_LEN], nameserver[IPADDR_FIELD_LEN];
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static int okbutton, cancelbutton;
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static char ipaddr[IPADDR_FIELD_LEN], netmask[IPADDR_FIELD_LEN], extras[EXTRAS_FIELD_LEN];
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/* What the screen size is meant to be */
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#define TCP_DIALOG_Y 0
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#define TCP_DIALOG_X 8
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#define TCP_DIALOG_WIDTH COLS - 16
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#define TCP_DIALOG_HEIGHT LINES - 2
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static Layout layout[] = {
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#define LAYOUT_HOSTNAME 0
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{ 1, 2, 25, HOSTNAME_FIELD_LEN - 1,
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"Host:", "Your fully-qualified hostname, e.g. foo.bar.com",
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hostname, STRINGOBJ, NULL },
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#define LAYOUT_DOMAINNAME 1
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{ 1, 35, 20, HOSTNAME_FIELD_LEN - 1,
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"Domain:",
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"The name of the domain that your machine is in, e.g. bar.com",
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domainname, STRINGOBJ, NULL },
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#define LAYOUT_GATEWAY 2
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{ 5, 2, 18, IPADDR_FIELD_LEN - 1,
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"Gateway:",
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"IP address of host forwarding packets to non-local destinations",
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gateway, STRINGOBJ, NULL },
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#define LAYOUT_NAMESERVER 3
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{ 5, 35, 18, IPADDR_FIELD_LEN - 1,
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"Name server:", "IP address of your local DNS server",
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nameserver, STRINGOBJ, NULL },
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#define LAYOUT_IPADDR 4
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{ 10, 10, 18, IPADDR_FIELD_LEN - 1,
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"IP Address:",
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"The IP address to be used for this interface",
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ipaddr, STRINGOBJ, NULL },
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#define LAYOUT_NETMASK 5
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{ 10, 35, 18, IPADDR_FIELD_LEN - 1,
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"Netmask:",
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"The netmask for this interface, e.g. 0xffffff00 for a class C network",
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netmask, STRINGOBJ, NULL },
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#define LAYOUT_EXTRAS 6
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{ 14, 10, 37, HOSTNAME_FIELD_LEN - 1,
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"Extra options to ifconfig:",
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"Any interface-specific options to ifconfig you would like to add",
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extras, STRINGOBJ, NULL },
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#define LAYOUT_OKBUTTON 7
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{ 19, 15, 0, 0,
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"OK", "Select this if you are happy with these settings",
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&okbutton, BUTTONOBJ, NULL },
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#define LAYOUT_CANCELBUTTON 8
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{ 19, 35, 0, 0,
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"CANCEL", "Select this if you wish to cancel this screen",
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&cancelbutton, BUTTONOBJ, NULL },
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{ NULL },
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};
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#define _validByte(b) ((b) >= 0 && (b) <= 255)
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/* whine */
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static void
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feepout(char *msg)
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{
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beep();
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msgConfirm(msg);
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}
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/* Very basic IP address integrity check - could be drastically improved */
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static int
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verifyIP(char *ip)
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{
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int a, b, c, d;
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if (ip && sscanf(ip, "%d.%d.%d.%d", &a, &b, &c, &d) == 4 &&
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_validByte(a) && _validByte(b) && _validByte(c) &&
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_validByte(d) && (d != 255))
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return 1;
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else
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return 0;
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}
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/* Check for the settings on the screen - the per-interface stuff is
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moved to the main handling code now to do it on the fly - sigh */
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static int
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verifySettings(void)
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{
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if (!hostname[0])
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feepout("Must specify a host name of some sort!");
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else if (gateway[0] && strcmp(gateway, "NO") && !verifyIP(gateway))
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feepout("Invalid gateway IP address specified");
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else if (nameserver[0] && !verifyIP(nameserver))
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feepout("Invalid name server IP address specified");
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else if (netmask[0] && (netmask[0] < '0' && netmask[0] > '3'))
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feepout("Invalid netmask value");
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else if (ipaddr[0] && !verifyIP(ipaddr))
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feepout("Invalid IP address");
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else
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return 1;
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return 0;
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}
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static void
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dhcpGetInfo(Device *devp)
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{
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/* If it fails, do it the old-fashioned way */
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if (dhcpParseLeases("/var/db/dhclient.leases", hostname, domainname,
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nameserver, ipaddr, gateway, netmask) == -1) {
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FILE *ifp;
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char *cp, cmd[256], data[2048];
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int i = 0, j = 0;
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/* Bah, now we have to kludge getting the information from ifconfig */
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snprintf(cmd, sizeof cmd, "ifconfig %s", devp->name);
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ifp = popen(cmd, "r");
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if (ifp) {
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while ((j = fread(data + i, 1, 512, ifp)) > 0)
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i += j;
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fclose(ifp);
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data[i] = 0;
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if (isDebug())
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msgDebug("DHCP configured interface returns %s\n", data);
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/* XXX This is gross as it assumes a certain ordering to
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ifconfig's output! XXX */
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if ((cp = strstr(data, "inet")) != NULL) {
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i = 0;
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cp += 5; /* move over keyword */
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while (*cp != ' ')
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ipaddr[i++] = *(cp++);
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ipaddr[i] = '\0';
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if (!strncmp(++cp, "netmask", 7)) {
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i = 0;
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cp += 8;
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while (*cp != ' ')
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netmask[i++] = *(cp++);
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netmask[i] = '\0';
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}
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}
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}
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}
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/* If we didn't get a name server value, hunt for it in resolv.conf */
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if (!nameserver[0] && file_readable("/etc/resolv.conf"))
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configEnvironmentResolv("/etc/resolv.conf");
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/* See if we have a hostname and can derive one if not */
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if (!hostname[0] && ipaddr[0]) {
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}
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variable_set2(VAR_HOSTNAME, hostname, 1);
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}
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/* This is it - how to get TCP setup values */
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int
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tcpOpenDialog(Device *devp)
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{
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WINDOW *ds_win, *save = NULL;
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ComposeObj *obj = NULL;
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int n = 0, filled = 0, cancel = FALSE;
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int max, ret = DITEM_SUCCESS;
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int use_dhcp = FALSE;
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char *tmp;
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char title[80];
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/* Initialise vars from previous device values */
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if (devp->private) {
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DevInfo *di = (DevInfo *)devp->private;
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SAFE_STRCPY(ipaddr, di->ipaddr);
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SAFE_STRCPY(netmask, di->netmask);
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SAFE_STRCPY(extras, di->extras);
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use_dhcp = di->use_dhcp;
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}
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else { /* See if there are any defaults */
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char *cp;
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/* First try a DHCP scan if such behavior is desired */
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if (!variable_cmp(VAR_TRY_DHCP, "YES") || !msgYesNo("Do you want to try DHCP configuration of the interface?")) {
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int k;
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Mkdir("/var/db");
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Mkdir("/var/run");
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Mkdir("/tmp");
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msgNotify("Scanning for DHCP servers...");
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for (k = 3; k; --k) {
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if (0 == vsystem("dhclient -1 %s", devp->name)) {
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dhcpGetInfo(devp);
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use_dhcp = TRUE;
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break;
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}
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}
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}
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/* Get old IP address from variable space, if available */
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if (!ipaddr[0]) {
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if ((cp = variable_get(VAR_IPADDR)) != NULL)
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SAFE_STRCPY(ipaddr, cp);
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else if ((cp = variable_get(string_concat3(devp->name, "_", VAR_IPADDR))) != NULL)
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SAFE_STRCPY(ipaddr, cp);
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}
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/* Get old netmask from variable space, if available */
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if (!netmask[0]) {
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if ((cp = variable_get(VAR_NETMASK)) != NULL)
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SAFE_STRCPY(netmask, cp);
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else if ((cp = variable_get(string_concat3(devp->name, "_", VAR_NETMASK))) != NULL)
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SAFE_STRCPY(netmask, cp);
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}
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/* Get old extras string from variable space, if available */
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if (!extras[0]) {
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if ((cp = variable_get(VAR_EXTRAS)) != NULL)
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SAFE_STRCPY(extras, cp);
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else if ((cp = variable_get(string_concat3(devp->name, "_", VAR_EXTRAS))) != NULL)
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SAFE_STRCPY(extras, cp);
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}
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}
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/* Look up values already recorded with the system, or blank the string variables ready to accept some new data */
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if (!hostname[0]) {
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tmp = variable_get(VAR_HOSTNAME);
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if (tmp)
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SAFE_STRCPY(hostname, tmp);
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}
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if (!domainname[0]) {
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tmp = variable_get(VAR_DOMAINNAME);
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if (tmp)
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SAFE_STRCPY(domainname, tmp);
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}
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if (!gateway[0]) {
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tmp = variable_get(VAR_GATEWAY);
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if (tmp)
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SAFE_STRCPY(gateway, tmp);
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}
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if (!nameserver[0]) {
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tmp = variable_get(VAR_NAMESERVER);
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if (tmp)
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SAFE_STRCPY(nameserver, tmp);
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}
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save = savescr();
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/* If non-interactive, jump straight over the dialog crap and into config section */
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if (variable_get(VAR_NONINTERACTIVE) &&
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!variable_get(VAR_NETINTERACTIVE)) {
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if (!hostname[0])
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msgConfirm("WARNING: hostname variable not set and is a non-optional\n"
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"parameter. Please add this to your installation script\n"
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"or set the netInteractive variable (see sysinstall man page)");
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else
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goto netconfig;
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}
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/* Now do all the screen I/O */
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dialog_clear_norefresh();
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/* We need a curses window */
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if (!(ds_win = openLayoutDialog(TCP_HELPFILE, " Network Configuration ",
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TCP_DIALOG_X, TCP_DIALOG_Y, TCP_DIALOG_WIDTH, TCP_DIALOG_HEIGHT))) {
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beep();
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msgConfirm("Cannot open TCP/IP dialog window!!");
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restorescr(save);
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return DITEM_FAILURE;
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}
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/* Draw interface configuration box */
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draw_box(ds_win, TCP_DIALOG_Y + 9, TCP_DIALOG_X + 8, TCP_DIALOG_HEIGHT - 13, TCP_DIALOG_WIDTH - 17,
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dialog_attr, border_attr);
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wattrset(ds_win, dialog_attr);
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sprintf(title, " Configuration for Interface %s ", devp->name);
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mvwaddstr(ds_win, TCP_DIALOG_Y + 9, TCP_DIALOG_X + 14, title);
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/* Some more initialisation before we go into the main input loop */
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obj = initLayoutDialog(ds_win, layout, TCP_DIALOG_X, TCP_DIALOG_Y, &max);
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reenter:
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cancelbutton = okbutton = 0;
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while (layoutDialogLoop(ds_win, layout, &obj, &n, max, &cancelbutton, &cancel)) {
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/* Prevent this from being irritating if user really means NO */
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if (filled < 3) {
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/* Insert a default value for the netmask, 0xffffff00 is
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* the most appropriate one (entire class C, or subnetted
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* class A/B network).
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*/
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if (!netmask[0]) {
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strcpy(netmask, "255.255.255.0");
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RefreshStringObj(layout[LAYOUT_NETMASK].obj);
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++filled;
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}
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if (!index(hostname, '.') && domainname[0]) {
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strcat(hostname, ".");
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strcat(hostname, domainname);
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RefreshStringObj(layout[LAYOUT_HOSTNAME].obj);
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++filled;
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}
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else if (((tmp = index(hostname, '.')) != NULL) && !domainname[0]) {
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SAFE_STRCPY(domainname, tmp + 1);
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RefreshStringObj(layout[LAYOUT_DOMAINNAME].obj);
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++filled;
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}
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}
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}
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if (!cancel && !verifySettings())
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goto reenter;
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/* Clear this crap off the screen */
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delwin(ds_win);
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dialog_clear_norefresh();
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use_helpfile(NULL);
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/* We actually need to inform the rest of sysinstall about this
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data now if the user hasn't selected cancel. Save the stuff
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out to the environment via the variable_set() mechanism */
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netconfig:
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if (!cancel) {
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DevInfo *di;
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char temp[512], ifn[255];
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char *ifaces;
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if (hostname[0]) {
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variable_set2(VAR_HOSTNAME, hostname, 1);
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sethostname(hostname, strlen(hostname));
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}
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if (domainname[0])
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variable_set2(VAR_DOMAINNAME, domainname, 0);
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if (gateway[0])
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variable_set2(VAR_GATEWAY, gateway, 1);
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if (nameserver[0])
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variable_set2(VAR_NAMESERVER, nameserver, 0);
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if (ipaddr[0])
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variable_set2(VAR_IPADDR, ipaddr, 0);
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if (!devp->private)
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devp->private = (DevInfo *)safe_malloc(sizeof(DevInfo));
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di = devp->private;
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SAFE_STRCPY(di->ipaddr, ipaddr);
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SAFE_STRCPY(di->netmask, netmask);
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SAFE_STRCPY(di->extras, extras);
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di->use_dhcp = use_dhcp;
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sprintf(ifn, "%s%s", VAR_IFCONFIG, devp->name);
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#ifdef notyet /* XXX this will only work once bpf is a loadable kernel mod */
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if (use_dhcp)
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sprintf(temp, "DHCP");
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else
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#endif
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sprintf(temp, "inet %s %s netmask %s", ipaddr, extras, netmask);
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variable_set2(ifn, temp, 1);
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ifaces = variable_get(VAR_INTERFACES);
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if (!ifaces)
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variable_set2(VAR_INTERFACES, ifaces = "lo0", 1);
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/* Only add it if it's not there already */
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if (!strstr(ifaces, devp->name)) {
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sprintf(ifn, "%s %s", devp->name, ifaces);
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variable_set2(VAR_INTERFACES, ifn, 1);
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}
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if (!use_dhcp)
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configResolv(NULL); /* XXX this will do it on the MFS copy XXX */
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ret = DITEM_SUCCESS;
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}
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else
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ret = DITEM_FAILURE;
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restorescr(save);
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return ret;
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}
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static Device *NetDev;
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static int
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netHook(dialogMenuItem *self)
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{
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Device **devs;
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devs = deviceFindDescr(self->prompt, self->title, DEVICE_TYPE_NETWORK);
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if (devs) {
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if (DITEM_STATUS(tcpOpenDialog(devs[0])) != DITEM_FAILURE)
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NetDev = devs[0];
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else
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NetDev = NULL;
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}
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return devs ? DITEM_LEAVE_MENU : DITEM_FAILURE;
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}
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/* Get a network device */
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Device *
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tcpDeviceSelect(void)
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{
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DMenu *menu;
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Device **devs, *rval;
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int cnt;
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devs = deviceFind(NULL, DEVICE_TYPE_NETWORK);
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cnt = deviceCount(devs);
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rval = NULL;
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if (!cnt) {
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msgConfirm("No network devices available!");
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return NULL;
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}
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else if (!RunningAsInit) {
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if (!msgYesNo("Running multi-user, assume that the network is already configured?"))
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return devs[0];
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}
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if (cnt == 1) {
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if (DITEM_STATUS(tcpOpenDialog(devs[0]) == DITEM_SUCCESS))
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rval = devs[0];
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}
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else if (variable_get(VAR_NONINTERACTIVE) && variable_get(VAR_NETWORK_DEVICE)) {
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devs = deviceFind(variable_get(VAR_NETWORK_DEVICE), DEVICE_TYPE_NETWORK);
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cnt = deviceCount(devs);
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if (cnt) {
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if (DITEM_STATUS(tcpOpenDialog(devs[0]) == DITEM_SUCCESS))
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rval = devs[0];
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}
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}
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else {
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int status;
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menu = deviceCreateMenu(&MenuNetworkDevice, DEVICE_TYPE_NETWORK, netHook, NULL);
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if (!menu)
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msgFatal("Unable to create network device menu! Argh!");
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status = dmenuOpenSimple(menu, FALSE);
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free(menu);
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if (status)
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rval = NetDev;
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}
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return rval;
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}
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/* Do it from a menu that doesn't care about status */
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int
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tcpMenuSelect(dialogMenuItem *self)
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{
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Device *tmp;
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tmp = tcpDeviceSelect();
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|
if (tmp && !((DevInfo *)tmp->private)->use_dhcp && !msgYesNo("Would you like to bring the %s interface up right now?", tmp->name))
|
|
if (!tmp->init(tmp))
|
|
msgConfirm("Initialization of %s device failed.", tmp->name);
|
|
return DITEM_SUCCESS | DITEM_RESTORE;
|
|
}
|