415 lines
9.9 KiB
C
415 lines
9.9 KiB
C
/*
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* dovend.c : Inserts all but the first few vendor options.
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*
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* $FreeBSD$
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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 <errno.h>
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#include <syslog.h>
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#ifndef USE_BFUNCS
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# include <memory.h>
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/* Yes, memcpy is OK here (no overlapped copies). */
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# define bcopy(a,b,c) memcpy(b,a,c)
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# define bzero(p,l) memset(p,0,l)
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# define bcmp(a,b,c) memcmp(a,b,c)
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# define index strchr
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#endif
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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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#ifdef __STDC__
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#define P(args) args
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#else
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#define P(args) ()
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#endif
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PRIVATE int insert_generic P((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(hp, buf, len)
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struct host *hp;
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byte *buf;
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int len;
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{
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int bytesleft = len;
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byte *vp = buf;
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static 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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char *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(tag, iplist, dest, bytesleft)
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byte tag;
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struct in_addr_list *iplist;
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byte **dest;
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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(gendata, buff, bytesleft)
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struct shared_bindata *gendata;
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byte **buff;
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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(value, dest)
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u_int32 value;
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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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