NetBSD/distrib/utils/sysinst/net.c

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/* $NetBSD: net.c,v 1.55 1999/10/29 19:45:20 he 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Piermont Information Systems Inc.
* 4. 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curses.h>
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#include <time.h>
#include <unistd.h>
#include <sys/param.h>
#include "defs.h"
#include "md.h"
#include "msg_defs.h"
#include "menu_defs.h"
#include "txtwalk.h"
int network_up = 0;
/* URL encode unsafe characters. */
static char *url_encode __P((char *dst, const char *src, size_t len,
const char *safe_chars,
int encode_leading_slash));
/* Get the list of network interfaces. */
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static void get_ifconfig_info __P((void));
static void get_ifinterface_info __P((void));
static void write_etc_hosts(FILE *f);
/*
* 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, size_t len,
const char *safe_chars, int encode_leading_slash)
{
char *p = dst;
/*
* If encoding of a leading slash was desired, and there was in
* fact one or more leading slashes, encode one in the output string.
*/
if (encode_leading_slash && *src == '/') {
if (len < 3)
goto done;
sprintf(p, "%%%02X", '/');
src++;
p += 3;
len -= 3;
}
while (--len > 0 && *src != '\0') {
if (safe_chars != NULL &&
(isalnum(*src) || strchr(safe_chars, *src))) {
*p++ = *src++;
} else {
/* encode this char */
if (len < 3)
break;
sprintf(p, "%%%02X", *src++);
p += 3;
len -= 2;
}
}
done:
*p = '\0';
return dst;
}
static const char *ignored_if_names[] = {
"eon", /* netiso */
"gre", /* net */
"ipip", /* netinet */
"gif", /* netinet6 */
"faith", /* netinet6 */
"lo", /* net */
#if 0
"mdecap", /* netinet -- never in IF list (?) XXX */
#endif
"nsip", /* netns */
"ppp", /* net */
"sl", /* net */
"strip", /* net */
"tun", /* net */
/* XXX others? */
NULL,
};
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static void
get_ifconfig_info()
{
char *textbuf;
char *t, *nt, *ndest;
const char **ignore;
int textsize, len;
/* Get ifconfig information */
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textsize = collect(T_OUTPUT, &textbuf, "/sbin/ifconfig -l 2>/dev/null");
if (textsize < 0) {
if (logging)
(void)fprintf(log, "Aborting: Could not run ifconfig.\n");
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(void)fprintf(stderr, "Could not run ifconfig.");
exit(1);
}
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(void)strtok(textbuf,"\n");
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nt = textbuf;
ndest = net_devices;
*ndest = '\0';
while ((t = strsep(&nt, " ")) != NULL) {
for (ignore = ignored_if_names; *ignore != NULL; ignore++) {
len = strlen(*ignore);
if (strncmp(t, *ignore, len) == 0 &&
isdigit((unsigned char)t[len]))
goto loop;
}
if (strlen(ndest) + 1 + strlen(t) + 1 > STRSIZE)
break; /* would overflow */
strcat(ndest, t);
strcat(ndest, " "); /* net_devices needs trailing space! */
loop:
t = nt;
}
free(textbuf);
}
/* Fill in defaults network values for the selected interface */
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static void
get_ifinterface_info()
{
char *textbuf;
int textsize;
char *t;
char hostname[MAXHOSTNAMELEN + 1];
/* First look to see if the selected interface is already configured. */
textsize = collect(T_OUTPUT, &textbuf, "/sbin/ifconfig %s 2>/dev/null",
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net_dev);
if (textsize >= 0) {
(void)strtok(textbuf, " \t\n"); /* ignore interface name */
while ((t = strtok(NULL, " \t\n")) != NULL) {
if (strcmp(t, "inet") == 0) {
t = strtok(NULL, " \t\n");
if (strcmp(t, "0.0.0.0") != 0)
strcpy(net_ip, t);
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} else if (strcmp(t, "netmask") == 0) {
t = strtok(NULL, " \t\n");
if (strcmp(t, "0x0") != 0)
strcpy(net_mask, t);
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} else if (strcmp(t, "media:") == 0) {
t = strtok(NULL, " \t\n");
/* handle "media: Ethernet manual" */
if (strcmp(t, "Ethernet") == 0)
t = strtok(NULL, " \t\n");
if (strcmp(t, "none") != 0 &&
strcmp(t, "manual") != 0)
strcpy(net_media, t);
}
}
}
/* Check host (and domain?) name */
if (gethostname(hostname, sizeof(hostname)) == 0) {
hostname[sizeof(hostname) - 1] = '\0';
strncpy(net_host, hostname, sizeof(net_host));
}
}
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/*
* Get the information to configure the network, configure it and
* make sure both the gateway and the name server are up.
*/
int
config_network()
{ char *tp;
char defname[255];
int octet0;
int pass, needmedia;
FILE *f;
time_t now;
if (network_up)
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return (1);
net_devices[0] = '\0';
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get_ifconfig_info();
if (strlen(net_devices) == 0) {
/* No network interfaces found! */
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msg_display(MSG_nonet);
process_menu(MENU_ok);
return (-1);
}
network_up = 1;
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strncpy(defname, net_devices, 255);
tp = defname;
strsep(&tp, " ");
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msg_prompt(MSG_asknetdev, defname, net_dev, 255, net_devices);
tp = net_dev;
strsep(&tp, " ");
net_dev[strlen(net_dev)+1] = 0;
net_dev[strlen(net_dev)] = ' ';
while (strstr(net_devices, net_dev) == NULL) {
msg_prompt(MSG_badnet, defname, net_dev, 255, net_devices);
tp = net_dev;
strsep(&tp, " ");
net_dev[strlen(net_dev)+1] = 0;
net_dev[strlen(net_dev)] = ' ';
}
/* Remove that space we added. */
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net_dev[strlen(net_dev) - 1] = 0;
/* Preload any defaults we can find */
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get_ifinterface_info();
pass = strlen(net_mask) == 0 ? 0 : 1;
needmedia = strlen(net_media) == 0 ? 0 : 1;
/* Get other net information */
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msg_display(MSG_netinfo);
do {
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msg_prompt_add(MSG_net_domain, net_domain, net_domain, STRSIZE);
msg_prompt_add(MSG_net_host, net_host, net_host, STRSIZE);
msg_prompt_add(MSG_net_ip, net_ip, net_ip, STRSIZE);
octet0 = atoi(net_ip);
if (!pass) {
if (0 <= octet0 && octet0 <= 127)
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strcpy(net_mask, "0xff000000");
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else if (128 <= octet0 && octet0 <= 191)
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strcpy(net_mask, "0xffff0000");
else if (192 <= octet0 && octet0 <= 223)
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strcpy(net_mask, "0xffffff00");
}
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msg_prompt_add(MSG_net_mask, net_mask, net_mask, STRSIZE);
msg_prompt_add(MSG_net_defroute, net_defroute, net_defroute,
STRSIZE);
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msg_prompt_add(MSG_net_namesrv, net_namesvr, net_namesvr,
STRSIZE);
if (needmedia)
msg_prompt_add(MSG_net_media, net_media, net_media,
STRSIZE);
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msg_display(MSG_netok, net_domain, net_host, net_ip, net_mask,
*net_namesvr == '\0' ? "<none>" : net_namesvr,
*net_defroute == '\0' ? "<none>" : net_defroute,
*net_media == '\0' ? "<default>" : net_media);
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process_menu(MENU_yesno);
if (!yesno)
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msg_display(MSG_netagain);
pass++;
} while (!yesno);
/* Create /etc/resolv.conf if a nameserver was given */
if (strcmp(net_namesvr, "") != 0) {
#ifdef DEBUG
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f = fopen("/tmp/resolv.conf", "w");
#else
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f = fopen("/etc/resolv.conf", "w");
#endif
if (f == NULL) {
if (logging)
(void)fprintf(log, "%s", msg_string(MSG_resolv));
(void)fprintf(stderr, "%s", msg_string(MSG_resolv));
exit(1);
}
if (scripting)
(void)fprintf(script, "cat <<EOF >/etc/resolv.conf\n");
time(&now);
/* NB: ctime() returns a string ending in '\n' */
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(void)fprintf(f, ";\n; BIND data file\n; %s %s;\n",
"Created by NetBSD sysinst on", ctime(&now));
(void)fprintf (f,
"nameserver %s\nsearch %s\n",
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net_namesvr, net_domain);
if (scripting) {
(void)fprintf(script, ";\n; BIND data file\n; %s %s;\n",
"Created by NetBSD sysinst on", ctime(&now));
(void)fprintf (script,
"nameserver %s\nsearch %s\n",
net_namesvr, net_domain);
}
fflush(NULL);
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fclose(f);
}
run_prog(0, 0, NULL, "/sbin/ifconfig lo0 127.0.0.1");
/*
* ifconfig does not allow media specifiers on IFM_MANUAL interfaces.
* Our UI gies no way to set an option back to null-string if it
* gets accidentally set.
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* good way to reset the media to null-string.
* 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')
run_prog(0, 0, NULL,
"/sbin/ifconfig %s inet %s netmask %s media %s",
net_dev, net_ip, net_mask, net_media);
else
run_prog(0, 0, NULL,
"/sbin/ifconfig %s inet %s netmask %s", net_dev,
net_ip, net_mask);
/* Set host name */
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if (strcmp(net_host, "") != 0)
sethostname(net_host, strlen(net_host));
/* Set a default route if one was given */
if (strcmp(net_defroute, "") != 0) {
run_prog(0, 0, NULL,
"/sbin/route -n flush");
run_prog(0, 0, NULL,
"/sbin/route -n add default %s",
net_defroute);
}
/*
* ping should be verbose, so users can see the cause
* of a network failure.
*/
if (strcmp(net_namesvr, "") != 0 && network_up)
network_up = !run_prog(0, 1, NULL,
"/sbin/ping -v -c 5 -w 5 -o -n %s",
net_namesvr);
if (strcmp(net_defroute, "") != 0 && network_up)
network_up = !run_prog(0, 1, NULL,
"/sbin/ping -v -c 5 -w 5 -o -n %s",
net_defroute);
fflush(NULL);
return network_up;
}
int
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get_via_ftp()
{
distinfo *list;
char ftp_user_encoded[STRSIZE];
char ftp_pass_encoded[STRSIZE];
char ftp_dir_encoded[STRSIZE];
char filename[SSTRSIZE];
int ret;
while ((ret = config_network()) <= 0) {
if (ret < 0)
return (-1);
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msg_display(MSG_netnotup);
process_menu(MENU_yesno);
if (!yesno)
return 0;
}
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cd_dist_dir("ftp");
/* Fill in final values for ftp_dir. */
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strncat(ftp_dir, rel, STRSIZE - strlen(ftp_dir));
strcat(ftp_dir, "/");
strncat(ftp_dir, machine, STRSIZE - strlen(ftp_dir));
strncat(ftp_dir, ftp_prefix, STRSIZE - strlen(ftp_dir));
process_menu(MENU_ftpsource);
list = dist_list;
while (list->name) {
if (!list->getit) {
list++;
continue;
}
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(void)snprintf(filename, SSTRSIZE, "%s%s", list->name,
dist_postfix);
/*
* Invoke ftp to fetch the file.
*
* ftp_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 ftp_user and ftp_dir. (For
* example, ftp_dir could easily contain '~', which is
* unsafe by a strict reading of RFC 1738).
*/
if (strcmp ("ftp", ftp_user) == 0)
ret = run_prog(0, 1, NULL,
"/usr/bin/ftp -a ftp://%s/%s/%s",
ftp_host,
url_encode(ftp_dir_encoded, ftp_dir, STRSIZE,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 1),
filename);
else {
ret = run_prog(0, 1, NULL,
"/usr/bin/ftp ftp://%s:%s@%s/%s/%s",
url_encode(ftp_user_encoded, ftp_user, STRSIZE,
RFC1738_SAFE_LESS_SHELL, 0),
url_encode(ftp_pass_encoded, ftp_pass, STRSIZE,
NULL, 0),
ftp_host,
url_encode(ftp_dir_encoded, ftp_dir, STRSIZE,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 1),
filename);
}
if (ret) {
/* Error getting the file. Bad host name ... ? */
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msg_display(MSG_ftperror_cont);
getchar();
puts(CL); /* XXX */
wclear(stdscr);
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wrefresh(stdscr);
msg_display(MSG_ftperror);
process_menu(MENU_yesno);
if (yesno)
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process_menu(MENU_ftpsource);
else
return 0;
} else
list++;
}
puts(CL); /* XXX */
wclear(stdscr);
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wrefresh(stdscr);
#ifndef DEBUG
chdir("/"); /* back to current real root */
#endif
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return (1);
}
int
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get_via_nfs()
{
int ret;
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while ((ret = config_network()) <= 0) {
if (ret < 0)
return (-1);
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msg_display(MSG_netnotup);
process_menu(MENU_yesno);
if (!yesno)
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return (0);
}
/* Get server and filepath */
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process_menu(MENU_nfssource);
again:
run_prog(0, 0, NULL,
"/sbin/umount /mnt2");
/* Mount it */
if (run_prog(0, 0, NULL,
"/sbin/mount -r -o -i,-r=1024 -t nfs %s:%s /mnt2",
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nfs_host, nfs_dir)) {
msg_display(MSG_nfsbadmount, nfs_host, nfs_dir);
process_menu(MENU_nfsbadmount);
if (!yesno)
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return (0);
if (!ignorerror)
goto again;
}
/* Verify distribution files exist. */
if (distribution_sets_exist_p("/mnt2") == 0) {
msg_display(MSG_badsetdir, "/mnt2");
process_menu (MENU_nfsbadmount);
if (!yesno)
return (0);
if (!ignorerror)
goto again;
}
/* return location, don't clean... */
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strcpy(ext_dir, "/mnt2");
clean_dist_dir = 0;
mnt2_mounted = 1;
return 1;
}
/*
* write the new contents of /etc/hosts to the specified file
*/
static void
write_etc_hosts(FILE *f)
{
int l;
fprintf(f, "#\n");
fprintf(f, "# Added by NetBSD sysinst\n");
fprintf(f, "#\n");
fprintf(f, "127.0.0.1 localhost\n");
fprintf(f, "%s\t", net_ip);
l = strlen(net_host) - strlen(net_domain);
if (l <= 0 ||
net_host[l - 1] != '.' ||
strcasecmp(net_domain, net_host + l) != 0) {
/* net_host isn't an FQDN. */
fprintf(f, "%s.%s ", net_host, net_domain);
}
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.
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*
* XXXX rc.conf support is needed here!
*/
void
mnt_net_config(void)
{
char ans [5] = "y";
char ifconfig_fn [STRSIZE];
FILE *f;
if (network_up) {
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msg_prompt(MSG_mntnetconfig, ans, ans, 5);
if (*ans == 'y') {
/* Write hostname to /etc/myname */
f = target_fopen("/etc/myname", "w");
if (f != 0) {
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(void)fprintf(f, "%s\n", net_host);
if (scripting)
(void)fprintf(script, "echo \"%s\" >%s/etc/myname\n", net_host, target_prefix());
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(void)fclose(f);
}
/* If not running in target, copy resolv.conf there. */
if (strcmp(net_namesvr, "") != 0)
dup_file_into_target("/etc/resolv.conf");
/*
* Add IPaddr/hostname to /etc/hosts.
* Be careful not to clobber any existing contents.
* Relies on ordered seach of /etc/hosts. XXX YP?
*/
f = target_fopen("/etc/hosts", "a");
if (f != 0) {
write_etc_hosts(f);
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(void)fclose(f);
if (scripting) {
(void)fprintf(script, "cat <<EOF >>%s/etc/hosts\n", target_prefix());
write_etc_hosts(script);
(void)fprintf(script, "EOF\n");
}
}
/* Write IPaddr and netmask to /etc/ifconfig.if[0-9] */
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snprintf(ifconfig_fn, STRSIZE, "/etc/ifconfig.%s",
net_dev);
f = target_fopen(ifconfig_fn, "w");
if (f != 0) {
if (*net_media != '\0') {
fprintf(f, "%s netmask %s media %s\n",
net_ip, net_mask, net_media);
if (scripting)
fprintf(script, "echo \"%s netmask %s media %s\">%s%s\n",
net_ip, net_mask, net_media, target_prefix(), ifconfig_fn);
} else {
fprintf(f, "%s netmask %s\n",
net_ip, net_mask);
if (scripting)
fprintf(script, "echo \"%s netmask %s\">%s%s\n",
net_ip, net_mask, target_prefix(), ifconfig_fn);
}
fclose(f);
}
f = target_fopen("/etc/mygate", "w");
if (f != 0) {
fprintf(f, "%s\n", net_defroute);
if (scripting)
fprintf(script, "echo \"%s\" >%s/etc/mygate\n", net_defroute, target_prefix());
fclose(f);
}
fflush(NULL);
}
}
}