be45f4d02a
using a #define to turn one into the other, this is pointless and causes more portability issues than it solves (admittedly, in the year 1702 when this code was written the opposite may have been the case).
397 lines
9.7 KiB
C
397 lines
9.7 KiB
C
/* $NetBSD: dovend.c,v 1.6 2007/05/27 16:31:42 tls Exp $ */
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: dovend.c,v 1.6 2007/05/27 16:31:42 tls Exp $");
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#endif
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/*
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* dovend.c : Inserts all but the first few vendor options.
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_ntoa */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <errno.h>
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#include <syslog.h>
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#include "bootp.h"
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#include "bootpd.h"
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#include "report.h"
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#include "dovend.h"
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PRIVATE int insert_generic(struct shared_bindata *, byte **, int *);
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/*
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* Insert the 2nd part of the options into an option buffer.
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* Return amount of space used.
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*
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* This inserts everything EXCEPT:
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* magic cookie, subnet mask, gateway, bootsize, extension file
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* Those are handled separately (in bootpd.c) to allow this function
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* to be shared between bootpd and bootpef.
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*
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* When an "extension file" is in use, the options inserted by
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* this function go into the exten_file, not the bootp response.
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*/
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int
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dovend_rfc1497(struct host *hp, byte *buf, int len)
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{
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int bytesleft = len;
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byte *vp = buf;
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#if 0
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char *tmpstr;
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#endif
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static const char noroom[] = "%s: No room for \"%s\" option";
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#define NEED(LEN, MSG) do \
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if (bytesleft < (LEN)) { \
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report(LOG_NOTICE, noroom, \
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hp->hostname->string, MSG); \
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return (vp - buf); \
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} while (0)
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/*
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* Note that the following have already been inserted:
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* magic_cookie, subnet_mask, gateway, bootsize
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*
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* The remaining options are inserted in order of importance.
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* (Of course the importance of each is a matter of opinion.)
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* The option insertion order should probably be configurable.
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*
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* This is the order used in the NetBSD version. Can anyone
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* explain why the time_offset and swap_server are first?
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* Also, why is the hostname so far down the list? -gwr
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*/
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if (hp->flags.time_offset) {
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NEED(6, "to");
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*vp++ = TAG_TIME_OFFSET;/* -1 byte */
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*vp++ = 4; /* -1 byte */
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insert_u_long(htonl(hp->time_offset), &vp); /* -4 bytes */
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bytesleft -= 6;
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}
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/*
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* swap server, root path, dump path
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*/
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if (hp->flags.swap_server) {
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NEED(6, "sw");
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/* There is just one SWAP_SERVER, so it is not an iplist. */
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*vp++ = TAG_SWAP_SERVER;/* -1 byte */
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*vp++ = 4; /* -1 byte */
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insert_u_long(hp->swap_server.s_addr, &vp); /* -4 bytes */
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bytesleft -= 6; /* Fix real count */
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}
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if (hp->flags.root_path) {
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/*
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* Check for room for root_path. Add 2 to account for
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* TAG_ROOT_PATH and length.
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*/
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len = strlen(hp->root_path->string);
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NEED((len + 2), "rp");
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*vp++ = TAG_ROOT_PATH;
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*vp++ = (byte) (len & 0xFF);
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bcopy(hp->root_path->string, vp, len);
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vp += len;
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bytesleft -= len + 2;
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}
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if (hp->flags.dump_file) {
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/*
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* Check for room for dump_file. Add 2 to account for
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* TAG_DUMP_FILE and length.
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*/
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len = strlen(hp->dump_file->string);
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NEED((len + 2), "df");
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*vp++ = TAG_DUMP_FILE;
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*vp++ = (byte) (len & 0xFF);
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bcopy(hp->dump_file->string, vp, len);
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vp += len;
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bytesleft -= len + 2;
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}
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/*
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* DNS server and domain
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*/
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if (hp->flags.domain_server) {
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if (insert_ip(TAG_DOMAIN_SERVER,
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hp->domain_server,
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&vp, &bytesleft))
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NEED(8, "ds");
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}
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if (hp->flags.domain_name) {
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/*
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* Check for room for domain_name. Add 2 to account for
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* TAG_DOMAIN_NAME and length.
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*/
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len = strlen(hp->domain_name->string);
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NEED((len + 2), "dn");
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*vp++ = TAG_DOMAIN_NAME;
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*vp++ = (byte) (len & 0xFF);
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bcopy(hp->domain_name->string, vp, len);
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vp += len;
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bytesleft -= len + 2;
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}
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/*
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* NIS (YP) server and domain
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*/
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if (hp->flags.nis_server) {
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if (insert_ip(TAG_NIS_SERVER,
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hp->nis_server,
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&vp, &bytesleft))
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NEED(8, "ds");
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}
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if (hp->flags.nis_domain) {
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/*
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* Check for room for nis_domain. Add 2 to account for
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* TAG_NIS_DOMAIN and length.
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*/
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len = strlen(hp->nis_domain->string);
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NEED((len + 2), "dn");
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*vp++ = TAG_NIS_DOMAIN;
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*vp++ = (byte) (len & 0xFF);
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bcopy(hp->nis_domain->string, vp, len);
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vp += len;
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bytesleft -= len + 2;
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}
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/* IEN 116 name server */
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if (hp->flags.name_server) {
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if (insert_ip(TAG_NAME_SERVER,
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hp->name_server,
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&vp, &bytesleft))
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NEED(8, "ns");
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}
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if (hp->flags.rlp_server) {
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if (insert_ip(TAG_RLP_SERVER,
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hp->rlp_server,
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&vp, &bytesleft))
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NEED(8, "rl");
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}
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/* Time server (RFC 868) */
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if (hp->flags.time_server) {
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if (insert_ip(TAG_TIME_SERVER,
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hp->time_server,
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&vp, &bytesleft))
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NEED(8, "ts");
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}
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/* NTP (time) Server (RFC 1129) */
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if (hp->flags.ntp_server) {
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if (insert_ip(TAG_NTP_SERVER,
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hp->ntp_server,
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&vp, &bytesleft))
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NEED(8, "ts");
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}
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/*
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* I wonder: If the hostname were "promoted" into the BOOTP
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* response part, might these "extension" files possibly be
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* shared between several clients?
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*
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* Also, why not just use longer BOOTP packets with all the
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* additional length used as option data. This bootpd version
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* already supports that feature by replying with the same
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* packet length as the client request packet. -gwr
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*/
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if (hp->flags.name_switch && hp->flags.send_name) {
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/*
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* Check for room for hostname. Add 2 to account for
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* TAG_HOST_NAME and length.
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*/
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len = strlen(hp->hostname->string);
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#if 0
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/*
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* XXX - Too much magic. The user can always set the hostname
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* to the short version in the bootptab file. -gwr
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*/
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if ((len + 2) > bytesleft) {
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/*
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* Not enough room for full (domain-qualified) hostname, try
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* stripping it down to just the first field (host).
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*/
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tmpstr = hp->hostname->string;
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len = 0;
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while (*tmpstr && (*tmpstr != '.')) {
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tmpstr++;
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len++;
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}
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}
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#endif
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NEED((len + 2), "hn");
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*vp++ = TAG_HOST_NAME;
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*vp++ = (byte) (len & 0xFF);
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bcopy(hp->hostname->string, vp, len);
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vp += len;
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bytesleft -= len + 2;
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}
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/*
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* The rest of these are less important, so they go last.
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*/
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if (hp->flags.lpr_server) {
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if (insert_ip(TAG_LPR_SERVER,
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hp->lpr_server,
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&vp, &bytesleft))
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NEED(8, "lp");
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}
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if (hp->flags.cookie_server) {
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if (insert_ip(TAG_COOKIE_SERVER,
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hp->cookie_server,
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&vp, &bytesleft))
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NEED(8, "cs");
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}
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if (hp->flags.log_server) {
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if (insert_ip(TAG_LOG_SERVER,
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hp->log_server,
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&vp, &bytesleft))
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NEED(8, "lg");
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}
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/*
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* XXX - Add new tags here (to insert options)
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*/
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if (hp->flags.generic) {
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if (insert_generic(hp->generic, &vp, &bytesleft))
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NEED(64, "(generic)");
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}
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/*
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* The end marker is inserted by the caller.
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*/
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return (vp - buf);
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#undef NEED
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} /* dovend_rfc1497 */
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/*
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* Insert a tag value, a length value, and a list of IP addresses into the
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* memory buffer indirectly pointed to by "dest". "tag" is the RFC1048 tag
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* number to use, "iplist" is a pointer to a list of IP addresses
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* (struct in_addr_list), and "bytesleft" points to an integer which
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* indicates the size of the "dest" buffer.
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*
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* Return zero if everything fits.
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*
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* This is used to fill the vendor-specific area of a bootp packet in
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* conformance to RFC1048.
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*/
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int
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insert_ip(byte tag, struct in_addr_list *iplist, byte **dest, int *bytesleft)
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{
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struct in_addr *addrptr;
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unsigned addrcount = 1;
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byte *d;
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if (iplist == NULL)
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return (0);
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if (*bytesleft >= 6) {
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d = *dest; /* Save pointer for later */
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**dest = tag;
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(*dest) += 2;
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(*bytesleft) -= 2; /* Account for tag and length */
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addrptr = iplist->addr;
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addrcount = iplist->addrcount;
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while ((*bytesleft >= 4) && (addrcount > 0)) {
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insert_u_long(addrptr->s_addr, dest);
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addrptr++;
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addrcount--;
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(*bytesleft) -= 4; /* Four bytes per address */
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}
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d[1] = (byte) ((*dest - d - 2) & 0xFF);
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}
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return (addrcount);
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}
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/*
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* Insert generic data into a bootp packet. The data is assumed to already
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* be in RFC1048 format. It is inserted using a first-fit algorithm which
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* attempts to insert as many tags as possible. Tags and data which are
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* too large to fit are skipped; any remaining tags are tried until they
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* have all been exhausted.
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* Return zero if everything fits.
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*/
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static int
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insert_generic(struct shared_bindata *gendata, byte **buff, int *bytesleft)
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{
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byte *srcptr;
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int length, numbytes;
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int skipped = 0;
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if (gendata == NULL)
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return (0);
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srcptr = gendata->data;
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length = gendata->length;
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while ((length > 0) && (*bytesleft > 0)) {
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switch (*srcptr) {
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case TAG_END:
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length = 0; /* Force an exit on next iteration */
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break;
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case TAG_PAD:
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*(*buff)++ = *srcptr++;
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(*bytesleft)--;
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length--;
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break;
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default:
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numbytes = srcptr[1] + 2;
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if (*bytesleft < numbytes)
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skipped += numbytes;
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else {
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bcopy(srcptr, *buff, numbytes);
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(*buff) += numbytes;
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(*bytesleft) -= numbytes;
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}
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srcptr += numbytes;
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length -= numbytes;
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break;
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}
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} /* while */
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return (skipped);
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}
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/*
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* Insert the unsigned long "value" into memory starting at the byte
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* pointed to by the byte pointer (*dest). (*dest) is updated to
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* point to the next available byte.
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*
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* Since it is desirable to internally store network addresses in network
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* byte order (in struct in_addr's), this routine expects longs to be
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* passed in network byte order.
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*
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* However, due to the nature of the main algorithm, the long must be in
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* host byte order, thus necessitating the use of ntohl() first.
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*/
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void
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insert_u_long(u_int32 value, byte **dest)
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{
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byte *temp;
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int n;
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value = ntohl(value); /* Must use host byte order here */
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temp = (*dest += 4);
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for (n = 4; n > 0; n--) {
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*--temp = (byte) (value & 0xFF);
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value >>= 8;
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}
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/* Final result is network byte order */
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}
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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