782 lines
20 KiB
C
782 lines
20 KiB
C
/* $NetBSD: bootp.c,v 1.14 1998/02/16 11:10:54 drochner Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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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* 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/limits.h>
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#include <sys/endian.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <string.h>
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#define BOOTP_DEBUGxx
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#define SUPPORT_DHCP
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#define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
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#define DHCP_ENV_PXE 10 /* assume pxe vendor options */
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#define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options */
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/* set DHCP_ENV to one of the values above to export dhcp options to kenv */
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#define DHCP_ENV DHCP_ENV_NO_VENDOR
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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#include "bootp.h"
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struct in_addr servip;
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static time_t bot;
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static char vm_rfc1048[4] = VM_RFC1048;
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#ifdef BOOTP_VEND_CMU
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static char vm_cmu[4] = VM_CMU;
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#endif
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/* Local forwards */
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static ssize_t bootpsend(struct iodesc *, void *, size_t);
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static ssize_t bootprecv(struct iodesc *, void **, void **, time_t, void *);
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static int vend_rfc1048(u_char *, u_int);
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#ifdef BOOTP_VEND_CMU
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static void vend_cmu(u_char *);
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#endif
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#ifdef DHCP_ENV /* export the dhcp response to kenv */
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struct dhcp_opt;
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static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
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#else
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#define setenv_(a, b, c)
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#endif
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#ifdef SUPPORT_DHCP
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static char expected_dhcpmsgtype = -1, dhcp_ok;
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struct in_addr dhcp_serverip;
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#endif
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struct bootp *bootp_response;
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size_t bootp_response_size;
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static void
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bootp_fill_request(unsigned char *bp_vend)
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{
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/*
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* We are booting from PXE, we want to send the string
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* 'PXEClient' to the DHCP server so you have the option of
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* only responding to PXE aware dhcp requests.
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*/
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bp_vend[0] = TAG_CLASSID;
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bp_vend[1] = 9;
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bcopy("PXEClient", &bp_vend[2], 9);
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bp_vend[11] = TAG_USER_CLASS;
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/* len of each user class + number of user class */
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bp_vend[12] = 8;
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/* len of the first user class */
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bp_vend[13] = 7;
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bcopy("FreeBSD", &bp_vend[14], 7);
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bp_vend[21] = TAG_PARAM_REQ;
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bp_vend[22] = 7;
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bp_vend[23] = TAG_ROOTPATH;
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bp_vend[24] = TAG_HOSTNAME;
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bp_vend[25] = TAG_SWAPSERVER;
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bp_vend[26] = TAG_GATEWAY;
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bp_vend[27] = TAG_SUBNET_MASK;
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bp_vend[28] = TAG_INTF_MTU;
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bp_vend[29] = TAG_SERVERID;
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bp_vend[30] = TAG_END;
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}
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/* Fetch required bootp infomation */
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void
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bootp(int sock)
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{
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void *pkt;
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struct iodesc *d;
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struct bootp *bp;
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struct {
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u_char header[HEADER_SIZE];
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struct bootp wbootp;
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} wbuf;
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struct bootp *rbootp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: socket=%d\n", sock);
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#endif
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if (!bot)
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bot = getsecs();
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if (!(d = socktodesc(sock))) {
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printf("bootp: bad socket. %d\n", sock);
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return;
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: d=%lx\n", (long)d);
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#endif
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bp = &wbuf.wbootp;
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bzero(bp, sizeof(*bp));
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bp->bp_op = BOOTREQUEST;
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bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
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bp->bp_hlen = 6;
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bp->bp_xid = htonl(d->xid);
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MACPY(d->myea, bp->bp_chaddr);
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strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
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bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
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#ifdef SUPPORT_DHCP
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bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
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bp->bp_vend[5] = 1;
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bp->bp_vend[6] = DHCPDISCOVER;
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bootp_fill_request(&bp->bp_vend[7]);
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#else
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bp->bp_vend[4] = TAG_END;
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#endif
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d->myip.s_addr = INADDR_ANY;
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d->myport = htons(IPPORT_BOOTPC);
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d->destip.s_addr = INADDR_BROADCAST;
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d->destport = htons(IPPORT_BOOTPS);
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#ifdef SUPPORT_DHCP
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expected_dhcpmsgtype = DHCPOFFER;
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dhcp_ok = 0;
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#endif
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if(sendrecv(d,
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bootpsend, bp, sizeof(*bp),
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bootprecv, &pkt, (void **)&rbootp, NULL) == -1) {
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printf("bootp: no reply\n");
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return;
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}
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#ifdef SUPPORT_DHCP
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if(dhcp_ok) {
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uint32_t leasetime;
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bp->bp_vend[6] = DHCPREQUEST;
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bp->bp_vend[7] = TAG_REQ_ADDR;
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bp->bp_vend[8] = 4;
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bcopy(&rbootp->bp_yiaddr, &bp->bp_vend[9], 4);
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bp->bp_vend[13] = TAG_SERVERID;
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bp->bp_vend[14] = 4;
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bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
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bp->bp_vend[19] = TAG_LEASETIME;
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bp->bp_vend[20] = 4;
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leasetime = htonl(300);
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bcopy(&leasetime, &bp->bp_vend[21], 4);
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bootp_fill_request(&bp->bp_vend[25]);
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expected_dhcpmsgtype = DHCPACK;
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free(pkt);
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if(sendrecv(d,
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bootpsend, bp, sizeof(*bp),
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bootprecv, &pkt, (void **)&rbootp, NULL) == -1) {
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printf("DHCPREQUEST failed\n");
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return;
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}
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}
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#endif
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myip = d->myip = rbootp->bp_yiaddr;
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servip = rbootp->bp_siaddr;
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if (rootip.s_addr == INADDR_ANY)
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rootip = servip;
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bcopy(rbootp->bp_file, bootfile, sizeof(bootfile));
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bootfile[sizeof(bootfile) - 1] = '\0';
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if (!netmask) {
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if (IN_CLASSA(ntohl(myip.s_addr)))
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netmask = htonl(IN_CLASSA_NET);
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else if (IN_CLASSB(ntohl(myip.s_addr)))
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netmask = htonl(IN_CLASSB_NET);
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else
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netmask = htonl(IN_CLASSC_NET);
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("'native netmask' is %s\n", intoa(netmask));
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#endif
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("mask: %s\n", intoa(netmask));
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#endif
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/* We need a gateway if root is on a different net */
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if (!SAMENET(myip, rootip, netmask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("need gateway for root ip\n");
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#endif
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}
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/* Toss gateway if on a different net */
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if (!SAMENET(myip, gateip, netmask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
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#endif
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gateip.s_addr = 0;
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}
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/* Bump xid so next request will be unique. */
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++d->xid;
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free(pkt);
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}
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/* Transmit a bootp request */
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static ssize_t
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bootpsend(struct iodesc *d, void *pkt, size_t len)
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{
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struct bootp *bp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: d=%lx called.\n", (long)d);
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#endif
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bp = pkt;
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bp->bp_secs = htons((u_short)(getsecs() - bot));
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: calling sendudp\n");
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#endif
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return (sendudp(d, pkt, len));
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}
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static ssize_t
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bootprecv(struct iodesc *d, void **pkt, void **payload, time_t tleft,
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void *extra)
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{
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ssize_t n;
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struct bootp *bp;
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void *ptr;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp_recvoffer: called\n");
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#endif
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ptr = NULL;
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n = readudp(d, &ptr, (void **)&bp, tleft);
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if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
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goto bad;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: checked. bp = %p, n = %zd\n", bp, n);
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#endif
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if (bp->bp_xid != htonl(d->xid)) {
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#ifdef BOOTP_DEBUG
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if (debug) {
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printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
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d->xid, ntohl(bp->bp_xid));
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}
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#endif
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goto bad;
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: got one!\n");
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#endif
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/* Suck out vendor info */
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if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
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int vsize = n - offsetof(struct bootp, bp_vend);
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if (vend_rfc1048(bp->bp_vend, vsize) != 0)
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goto bad;
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/* Save copy of bootp reply or DHCP ACK message */
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if (bp->bp_op == BOOTREPLY &&
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((dhcp_ok == 1 && expected_dhcpmsgtype == DHCPACK) ||
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dhcp_ok == 0)) {
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free(bootp_response);
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bootp_response = malloc(n);
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if (bootp_response != NULL) {
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bootp_response_size = n;
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bcopy(bp, bootp_response, bootp_response_size);
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}
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}
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}
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#ifdef BOOTP_VEND_CMU
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else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
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vend_cmu(bp->bp_vend);
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#endif
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else
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printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
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*pkt = ptr;
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*payload = bp;
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return (n);
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bad:
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free(ptr);
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errno = 0;
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return (-1);
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}
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static int
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vend_rfc1048(u_char *cp, u_int len)
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{
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u_char *ep;
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int size;
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u_char tag;
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const char *val;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_rfc1048 bootp info. len=%d\n", len);
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#endif
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ep = cp + len;
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/* Step over magic cookie */
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cp += sizeof(int);
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setenv_(cp, ep, NULL);
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while (cp < ep) {
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tag = *cp++;
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size = *cp++;
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if (tag == TAG_END)
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break;
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if (tag == TAG_SUBNET_MASK) {
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bcopy(cp, &netmask, sizeof(netmask));
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}
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if (tag == TAG_GATEWAY) {
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bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
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}
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if (tag == TAG_SWAPSERVER) {
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/* let it override bp_siaddr */
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bcopy(cp, &rootip.s_addr, sizeof(rootip.s_addr));
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}
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if (tag == TAG_ROOTPATH) {
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if ((val = getenv("dhcp.root-path")) == NULL)
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val = (const char *)cp;
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strlcpy(rootpath, val, sizeof(rootpath));
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}
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if (tag == TAG_HOSTNAME) {
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if ((val = getenv("dhcp.host-name")) == NULL)
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val = (const char *)cp;
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strlcpy(hostname, val, sizeof(hostname));
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}
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if (tag == TAG_INTF_MTU) {
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intf_mtu = 0;
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if ((val = getenv("dhcp.interface-mtu")) != NULL) {
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unsigned long tmp;
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char *end;
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errno = 0;
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/*
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* Do not allow MTU to exceed max IPv4 packet
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* size, max value of 16-bit word.
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*/
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tmp = strtoul(val, &end, 0);
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if (errno != 0 ||
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*val == '\0' || *end != '\0' ||
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tmp > USHRT_MAX) {
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printf("%s: bad value: \"%s\", "
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"ignoring\n",
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"dhcp.interface-mtu", val);
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} else {
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intf_mtu = (u_int)tmp;
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}
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}
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if (intf_mtu <= 0)
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intf_mtu = be16dec(cp);
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}
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#ifdef SUPPORT_DHCP
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if (tag == TAG_DHCP_MSGTYPE) {
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if(*cp != expected_dhcpmsgtype)
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return(-1);
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dhcp_ok = 1;
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}
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if (tag == TAG_SERVERID) {
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bcopy(cp, &dhcp_serverip.s_addr,
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sizeof(dhcp_serverip.s_addr));
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}
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#endif
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cp += size;
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}
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return(0);
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}
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#ifdef BOOTP_VEND_CMU
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static void
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vend_cmu(u_char *cp)
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{
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struct cmu_vend *vp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_cmu bootp info.\n");
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#endif
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vp = (struct cmu_vend *)cp;
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if (vp->v_smask.s_addr != 0) {
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netmask = vp->v_smask.s_addr;
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}
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if (vp->v_dgate.s_addr != 0) {
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gateip = vp->v_dgate;
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}
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}
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#endif
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#ifdef DHCP_ENV
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/*
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* Parse DHCP options and store them into kenv variables.
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* Original code from Danny Braniss, modifications by Luigi Rizzo.
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*
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* The parser is driven by tables which specify the type and name of
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* each dhcp option and how it appears in kenv.
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* The first entry in the list contains the prefix used to set the kenv
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* name (including the . if needed), the last entry must have a 0 tag.
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* Entries do not need to be sorted though it helps for readability.
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*
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* Certain vendor-specific tables can be enabled according to DHCP_ENV.
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* Set it to 0 if you don't want any.
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*/
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enum opt_fmt { __NONE = 0,
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__8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
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__IP, /* IPv4 address */
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__TXT, /* C string */
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__BYTES, /* byte sequence, printed %02x */
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__INDIR, /* name=value */
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__ILIST, /* name=value;name=value ... */
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__VE, /* vendor specific, recurse */
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};
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struct dhcp_opt {
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uint8_t tag;
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uint8_t fmt;
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const char *desc;
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};
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static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
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#if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
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{0, 0, "FreeBSD"}, /* prefix */
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{1, __TXT, "kernel"},
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{2, __TXT, "kernelname"},
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{3, __TXT, "kernel_options"},
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{4, __IP, "usr-ip"},
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{5, __TXT, "conf-path"},
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|
{6, __TXT, "rc.conf0"},
|
|
{7, __TXT, "rc.conf1"},
|
|
{8, __TXT, "rc.conf2"},
|
|
{9, __TXT, "rc.conf3"},
|
|
{10, __TXT, "rc.conf4"},
|
|
{11, __TXT, "rc.conf5"},
|
|
{12, __TXT, "rc.conf6"},
|
|
{13, __TXT, "rc.conf7"},
|
|
{14, __TXT, "rc.conf8"},
|
|
{15, __TXT, "rc.conf9"},
|
|
|
|
{20, __TXT, "boot.nfsroot.options"},
|
|
|
|
{245, __INDIR, ""},
|
|
{246, __INDIR, ""},
|
|
{247, __INDIR, ""},
|
|
{248, __INDIR, ""},
|
|
{249, __INDIR, ""},
|
|
{250, __INDIR, ""},
|
|
{251, __INDIR, ""},
|
|
{252, __INDIR, ""},
|
|
{253, __INDIR, ""},
|
|
{254, __INDIR, ""},
|
|
|
|
#elif DHCP_ENV == DHCP_ENV_PXE /* some pxe options, RFC4578 */
|
|
{0, 0, "pxe"}, /* prefix */
|
|
{93, __16, "system-architecture"},
|
|
{94, __BYTES, "network-interface"},
|
|
{97, __BYTES, "machine-identifier"},
|
|
#else /* default (empty) table */
|
|
{0, 0, "dhcp.vendor."}, /* prefix */
|
|
#endif
|
|
{0, __TXT, "%soption-%d"}
|
|
};
|
|
|
|
static struct dhcp_opt dhcp_opt[] = {
|
|
/* DHCP Option names, formats and codes, from RFC2132. */
|
|
{0, 0, "dhcp."}, // prefix
|
|
{1, __IP, "subnet-mask"},
|
|
{2, __32, "time-offset"}, /* this is signed */
|
|
{3, __IP, "routers"},
|
|
{4, __IP, "time-servers"},
|
|
{5, __IP, "ien116-name-servers"},
|
|
{6, __IP, "domain-name-servers"},
|
|
{7, __IP, "log-servers"},
|
|
{8, __IP, "cookie-servers"},
|
|
{9, __IP, "lpr-servers"},
|
|
{10, __IP, "impress-servers"},
|
|
{11, __IP, "resource-location-servers"},
|
|
{12, __TXT, "host-name"},
|
|
{13, __16, "boot-size"},
|
|
{14, __TXT, "merit-dump"},
|
|
{15, __TXT, "domain-name"},
|
|
{16, __IP, "swap-server"},
|
|
{17, __TXT, "root-path"},
|
|
{18, __TXT, "extensions-path"},
|
|
{19, __8, "ip-forwarding"},
|
|
{20, __8, "non-local-source-routing"},
|
|
{21, __IP, "policy-filter"},
|
|
{22, __16, "max-dgram-reassembly"},
|
|
{23, __8, "default-ip-ttl"},
|
|
{24, __32, "path-mtu-aging-timeout"},
|
|
{25, __16, "path-mtu-plateau-table"},
|
|
{26, __16, "interface-mtu"},
|
|
{27, __8, "all-subnets-local"},
|
|
{28, __IP, "broadcast-address"},
|
|
{29, __8, "perform-mask-discovery"},
|
|
{30, __8, "mask-supplier"},
|
|
{31, __8, "perform-router-discovery"},
|
|
{32, __IP, "router-solicitation-address"},
|
|
{33, __IP, "static-routes"},
|
|
{34, __8, "trailer-encapsulation"},
|
|
{35, __32, "arp-cache-timeout"},
|
|
{36, __8, "ieee802-3-encapsulation"},
|
|
{37, __8, "default-tcp-ttl"},
|
|
{38, __32, "tcp-keepalive-interval"},
|
|
{39, __8, "tcp-keepalive-garbage"},
|
|
{40, __TXT, "nis-domain"},
|
|
{41, __IP, "nis-servers"},
|
|
{42, __IP, "ntp-servers"},
|
|
{43, __VE, "vendor-encapsulated-options"},
|
|
{44, __IP, "netbios-name-servers"},
|
|
{45, __IP, "netbios-dd-server"},
|
|
{46, __8, "netbios-node-type"},
|
|
{47, __TXT, "netbios-scope"},
|
|
{48, __IP, "x-font-servers"},
|
|
{49, __IP, "x-display-managers"},
|
|
{50, __IP, "dhcp-requested-address"},
|
|
{51, __32, "dhcp-lease-time"},
|
|
{52, __8, "dhcp-option-overload"},
|
|
{53, __8, "dhcp-message-type"},
|
|
{54, __IP, "dhcp-server-identifier"},
|
|
{55, __8, "dhcp-parameter-request-list"},
|
|
{56, __TXT, "dhcp-message"},
|
|
{57, __16, "dhcp-max-message-size"},
|
|
{58, __32, "dhcp-renewal-time"},
|
|
{59, __32, "dhcp-rebinding-time"},
|
|
{60, __TXT, "vendor-class-identifier"},
|
|
{61, __TXT, "dhcp-client-identifier"},
|
|
{64, __TXT, "nisplus-domain"},
|
|
{65, __IP, "nisplus-servers"},
|
|
{66, __TXT, "tftp-server-name"},
|
|
{67, __TXT, "bootfile-name"},
|
|
{68, __IP, "mobile-ip-home-agent"},
|
|
{69, __IP, "smtp-server"},
|
|
{70, __IP, "pop-server"},
|
|
{71, __IP, "nntp-server"},
|
|
{72, __IP, "www-server"},
|
|
{73, __IP, "finger-server"},
|
|
{74, __IP, "irc-server"},
|
|
{75, __IP, "streettalk-server"},
|
|
{76, __IP, "streettalk-directory-assistance-server"},
|
|
{77, __TXT, "user-class"},
|
|
{85, __IP, "nds-servers"},
|
|
{86, __TXT, "nds-tree-name"},
|
|
{87, __TXT, "nds-context"},
|
|
{210, __TXT, "authenticate"},
|
|
|
|
/* use the following entries for arbitrary variables */
|
|
{246, __ILIST, ""},
|
|
{247, __ILIST, ""},
|
|
{248, __ILIST, ""},
|
|
{249, __ILIST, ""},
|
|
{250, __INDIR, ""},
|
|
{251, __INDIR, ""},
|
|
{252, __INDIR, ""},
|
|
{253, __INDIR, ""},
|
|
{254, __INDIR, ""},
|
|
{0, __TXT, "%soption-%d"}
|
|
};
|
|
|
|
/*
|
|
* parse a dhcp response, set environment variables translating options
|
|
* names and values according to the tables above. Also set dhcp.tags
|
|
* to the list of selected tags.
|
|
*/
|
|
static void
|
|
setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts)
|
|
{
|
|
u_char *ncp;
|
|
u_char tag;
|
|
char tags[512], *tp; /* the list of tags */
|
|
|
|
#define FLD_SEP ',' /* separator in list of elements */
|
|
ncp = cp;
|
|
tp = tags;
|
|
if (opts == NULL)
|
|
opts = dhcp_opt;
|
|
|
|
while (ncp < ep) {
|
|
unsigned int size; /* option size */
|
|
char *vp, *endv, buf[256]; /* the value buffer */
|
|
struct dhcp_opt *op;
|
|
|
|
tag = *ncp++; /* extract tag and size */
|
|
size = *ncp++;
|
|
cp = ncp; /* current payload */
|
|
ncp += size; /* point to the next option */
|
|
|
|
if (tag == TAG_END)
|
|
break;
|
|
if (tag == 0)
|
|
continue;
|
|
|
|
for (op = opts+1; op->tag && op->tag != tag; op++)
|
|
;
|
|
/* if not found we end up on the default entry */
|
|
|
|
/*
|
|
* Copy data into the buffer. libstand does not have snprintf so we
|
|
* need to be careful with sprintf(). With strings, the source is
|
|
* always <256 char so shorter than the buffer so we are safe; with
|
|
* other arguments, the longest string is inet_ntoa which is 16 bytes
|
|
* so we make sure to have always enough room in the string before
|
|
* trying an sprint.
|
|
*/
|
|
vp = buf;
|
|
*vp = '\0';
|
|
endv = buf + sizeof(buf) - 1 - 16; /* last valid write position */
|
|
|
|
switch(op->fmt) {
|
|
case __NONE:
|
|
break; /* should not happen */
|
|
|
|
case __VE: /* recurse, vendor specific */
|
|
setenv_(cp, cp+size, vndr_opt);
|
|
break;
|
|
|
|
case __IP: /* ip address */
|
|
for (; size > 0 && vp < endv; size -= 4, cp += 4) {
|
|
struct in_addr in_ip; /* ip addresses */
|
|
if (vp != buf)
|
|
*vp++ = FLD_SEP;
|
|
bcopy(cp, &in_ip.s_addr, sizeof(in_ip.s_addr));
|
|
sprintf(vp, "%s", inet_ntoa(in_ip));
|
|
vp += strlen(vp);
|
|
}
|
|
break;
|
|
|
|
case __BYTES: /* opaque byte string */
|
|
for (; size > 0 && vp < endv; size -= 1, cp += 1) {
|
|
sprintf(vp, "%02x", *cp);
|
|
vp += strlen(vp);
|
|
}
|
|
break;
|
|
|
|
case __TXT:
|
|
bcopy(cp, buf, size); /* cannot overflow */
|
|
buf[size] = 0;
|
|
break;
|
|
|
|
case __32:
|
|
case __16:
|
|
case __8: /* op->fmt is also the length of each field */
|
|
for (; size > 0 && vp < endv; size -= op->fmt, cp += op->fmt) {
|
|
uint32_t v;
|
|
if (op->fmt == __32)
|
|
v = (cp[0]<<24) + (cp[1]<<16) + (cp[2]<<8) + cp[3];
|
|
else if (op->fmt == __16)
|
|
v = (cp[0]<<8) + cp[1];
|
|
else
|
|
v = cp[0];
|
|
if (vp != buf)
|
|
*vp++ = FLD_SEP;
|
|
sprintf(vp, "%u", v);
|
|
vp += strlen(vp);
|
|
}
|
|
break;
|
|
|
|
case __INDIR: /* name=value */
|
|
case __ILIST: /* name=value;name=value... */
|
|
bcopy(cp, buf, size); /* cannot overflow */
|
|
buf[size] = '\0';
|
|
for (endv = buf; endv; endv = vp) {
|
|
char *s = NULL; /* semicolon ? */
|
|
|
|
/* skip leading whitespace */
|
|
while (*endv && strchr(" \t\n\r", *endv))
|
|
endv++;
|
|
vp = strchr(endv, '='); /* find name=value separator */
|
|
if (!vp)
|
|
break;
|
|
*vp++ = 0;
|
|
if (op->fmt == __ILIST && (s = strchr(vp, ';')))
|
|
*s++ = '\0';
|
|
setenv(endv, vp, 1);
|
|
vp = s; /* prepare for next round */
|
|
}
|
|
buf[0] = '\0'; /* option already done */
|
|
}
|
|
|
|
if (tp - tags < sizeof(tags) - 5) { /* add tag to the list */
|
|
if (tp != tags)
|
|
*tp++ = FLD_SEP;
|
|
sprintf(tp, "%d", tag);
|
|
tp += strlen(tp);
|
|
}
|
|
if (buf[0]) {
|
|
char env[128]; /* the string name */
|
|
|
|
if (op->tag == 0)
|
|
sprintf(env, op->desc, opts[0].desc, tag);
|
|
else
|
|
sprintf(env, "%s%s", opts[0].desc, op->desc);
|
|
/*
|
|
* Do not replace existing values in the environment, so that
|
|
* locally-obtained values can override server-provided values.
|
|
*/
|
|
setenv(env, buf, 0);
|
|
}
|
|
}
|
|
if (tp != tags) {
|
|
char env[128]; /* the string name */
|
|
sprintf(env, "%stags", opts[0].desc);
|
|
setenv(env, tags, 1);
|
|
}
|
|
}
|
|
#endif /* additional dhcp */
|