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freebsd-skq/lib/libstand/bootp.c
Luigi Rizzo 7e8cc2bd03 Some libstand/bootp.c extension (written by Danny Braniss, slightly 
revised/modified by me) to store dhcp options into kenv variables,
so the information is available to the boot loader and can be used
to customize the boot process.

The change is totally unintrusive, essentially made of a single
function to be called while parsing a dhcp response, and a couple
of tables to classify options.  The values extracted from dhcp
options are stored in the kenv environment in one of these forms:

 + options whose name and type is known are saved as
        dhcp.name = value     (string, or number/ip addresses lists)

 + unknown options are assumed to be strings and saved as
        dhcp.option-NNN = "value"

 + options listed as '__INDIR' and sent on the wire as e.g.
        option unknown-252 "some.name=the actual value"
   are saved as
        some.name = "the actual value"

 + options listed as '__ILIST' and sent on the wire as e.g.
        option unknown-249 "a.b=foo bar; c.d= 123; e.f=done"
   are saved as multiple values
        a.b="foo bar"
        c.d="123"
        e.f="done"

As you can see there is quite a bit of flexibility on what can
be passed to the loader or the kernel.

For the time being the vendor-specific table is mostly disabled,
because there is no standard set of options for FreeBSD, and I don't
know all the pxe-specific vendor options.

Also, applications using libstand may live in memory-constrained
environments, so it makes sense to keep these tables as small as
possible, especially considering that one can generate arbitrary
name=value pairs using site-specific options of type __INDIR or
__ILIST (there are 4 __ILIST and 5 __INDIR in the table, numbered
246..249 and 250..254).

Actually, considering that probably 75% of the standard dhcp options
are totally useless, it might make sense to remove them as well.

Submitted by:	Danny Braniss
MFC after:	4 weeks
2008-12-05 17:13:40 +00:00

743 lines
18 KiB
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/* $NetBSD: bootp.c,v 1.14 1998/02/16 11:10:54 drochner Exp $ */
/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <string.h>
#define BOOTP_DEBUGxx
#define SUPPORT_DHCP
#define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
#define DHCP_ENV_PXE 10 /* assume pxe vendor options */
#define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options
/* set DHCP_ENV to one of the values above to export dhcp options to kenv */
#define DHCP_ENV DHCP_ENV_NO_VENDOR
#include "stand.h"
#include "net.h"
#include "netif.h"
#include "bootp.h"
struct in_addr servip;
static n_long nmask, smask;
static time_t bot;
static char vm_rfc1048[4] = VM_RFC1048;
#ifdef BOOTP_VEND_CMU
static char vm_cmu[4] = VM_CMU;
#endif
/* Local forwards */
static ssize_t bootpsend(struct iodesc *, void *, size_t);
static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
static int vend_rfc1048(u_char *, u_int);
#ifdef BOOTP_VEND_CMU
static void vend_cmu(u_char *);
#endif
#ifdef DHCP_ENV /* export the dhcp response to kenv */
struct dhcp_opt;
static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
#else
#define setenv_(a, b, c)
#endif
#ifdef SUPPORT_DHCP
static char expected_dhcpmsgtype = -1, dhcp_ok;
struct in_addr dhcp_serverip;
#endif
/* Fetch required bootp infomation */
void
bootp(sock, flag)
int sock;
int flag;
{
struct iodesc *d;
struct bootp *bp;
struct {
u_char header[HEADER_SIZE];
struct bootp wbootp;
} wbuf;
struct {
u_char header[HEADER_SIZE];
struct bootp rbootp;
} rbuf;
#ifdef BOOTP_DEBUG
if (debug)
printf("bootp: socket=%d\n", sock);
#endif
if (!bot)
bot = getsecs();
if (!(d = socktodesc(sock))) {
printf("bootp: bad socket. %d\n", sock);
return;
}
#ifdef BOOTP_DEBUG
if (debug)
printf("bootp: d=%lx\n", (long)d);
#endif
bp = &wbuf.wbootp;
bzero(bp, sizeof(*bp));
bp->bp_op = BOOTREQUEST;
bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
bp->bp_hlen = 6;
bp->bp_xid = htonl(d->xid);
MACPY(d->myea, bp->bp_chaddr);
strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
#ifdef SUPPORT_DHCP
bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
bp->bp_vend[5] = 1;
bp->bp_vend[6] = DHCPDISCOVER;
/*
* If we are booting from PXE, we want to send the string
* 'PXEClient' to the DHCP server so you have the option of
* only responding to PXE aware dhcp requests.
*/
if (flag & BOOTP_PXE) {
bp->bp_vend[7] = TAG_CLASSID;
bp->bp_vend[8] = 9;
bcopy("PXEClient", &bp->bp_vend[9], 9);
bp->bp_vend[18] = TAG_END;
} else
bp->bp_vend[7] = TAG_END;
#else
bp->bp_vend[4] = TAG_END;
#endif
d->myip.s_addr = INADDR_ANY;
d->myport = htons(IPPORT_BOOTPC);
d->destip.s_addr = INADDR_BROADCAST;
d->destport = htons(IPPORT_BOOTPS);
#ifdef SUPPORT_DHCP
expected_dhcpmsgtype = DHCPOFFER;
dhcp_ok = 0;
#endif
if(sendrecv(d,
bootpsend, bp, sizeof(*bp),
bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
== -1) {
printf("bootp: no reply\n");
return;
}
#ifdef SUPPORT_DHCP
if(dhcp_ok) {
u_int32_t leasetime;
bp->bp_vend[6] = DHCPREQUEST;
bp->bp_vend[7] = TAG_REQ_ADDR;
bp->bp_vend[8] = 4;
bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4);
bp->bp_vend[13] = TAG_SERVERID;
bp->bp_vend[14] = 4;
bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
bp->bp_vend[19] = TAG_LEASETIME;
bp->bp_vend[20] = 4;
leasetime = htonl(300);
bcopy(&leasetime, &bp->bp_vend[21], 4);
if (flag & BOOTP_PXE) {
bp->bp_vend[25] = TAG_CLASSID;
bp->bp_vend[26] = 9;
bcopy("PXEClient", &bp->bp_vend[27], 9);
bp->bp_vend[36] = TAG_END;
} else
bp->bp_vend[25] = TAG_END;
expected_dhcpmsgtype = DHCPACK;
if(sendrecv(d,
bootpsend, bp, sizeof(*bp),
bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
== -1) {
printf("DHCPREQUEST failed\n");
return;
}
}
#endif
myip = d->myip = rbuf.rbootp.bp_yiaddr;
servip = rbuf.rbootp.bp_siaddr;
if(rootip.s_addr == INADDR_ANY) rootip = servip;
bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile));
bootfile[sizeof(bootfile) - 1] = '\0';
if (IN_CLASSA(ntohl(myip.s_addr)))
nmask = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(myip.s_addr)))
nmask = htonl(IN_CLASSB_NET);
else
nmask = htonl(IN_CLASSC_NET);
#ifdef BOOTP_DEBUG
if (debug)
printf("'native netmask' is %s\n", intoa(nmask));
#endif
/* Check subnet mask against net mask; toss if bogus */
if ((nmask & smask) != nmask) {
#ifdef BOOTP_DEBUG
if (debug)
printf("subnet mask (%s) bad\n", intoa(smask));
#endif
smask = 0;
}
/* Get subnet (or natural net) mask */
netmask = nmask;
if (smask)
netmask = smask;
#ifdef BOOTP_DEBUG
if (debug)
printf("mask: %s\n", intoa(netmask));
#endif
/* We need a gateway if root is on a different net */
if (!SAMENET(myip, rootip, netmask)) {
#ifdef BOOTP_DEBUG
if (debug)
printf("need gateway for root ip\n");
#endif
}
/* Toss gateway if on a different net */
if (!SAMENET(myip, gateip, netmask)) {
#ifdef BOOTP_DEBUG
if (debug)
printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
#endif
gateip.s_addr = 0;
}
/* Bump xid so next request will be unique. */
++d->xid;
}
/* Transmit a bootp request */
static ssize_t
bootpsend(d, pkt, len)
struct iodesc *d;
void *pkt;
size_t len;
{
struct bootp *bp;
#ifdef BOOTP_DEBUG
if (debug)
printf("bootpsend: d=%lx called.\n", (long)d);
#endif
bp = pkt;
bp->bp_secs = htons((u_short)(getsecs() - bot));
#ifdef BOOTP_DEBUG
if (debug)
printf("bootpsend: calling sendudp\n");
#endif
return (sendudp(d, pkt, len));
}
static ssize_t
bootprecv(d, pkt, len, tleft)
struct iodesc *d;
void *pkt;
size_t len;
time_t tleft;
{
ssize_t n;
struct bootp *bp;
#ifdef BOOTP_DEBUGx
if (debug)
printf("bootp_recvoffer: called\n");
#endif
n = readudp(d, pkt, len, tleft);
if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
goto bad;
bp = (struct bootp *)pkt;
#ifdef BOOTP_DEBUG
if (debug)
printf("bootprecv: checked. bp = 0x%lx, n = %d\n",
(long)bp, (int)n);
#endif
if (bp->bp_xid != htonl(d->xid)) {
#ifdef BOOTP_DEBUG
if (debug) {
printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
d->xid, ntohl(bp->bp_xid));
}
#endif
goto bad;
}
#ifdef BOOTP_DEBUG
if (debug)
printf("bootprecv: got one!\n");
#endif
/* Suck out vendor info */
if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
goto bad;
}
#ifdef BOOTP_VEND_CMU
else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
vend_cmu(bp->bp_vend);
#endif
else
printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
return(n);
bad:
errno = 0;
return (-1);
}
static int
vend_rfc1048(cp, len)
u_char *cp;
u_int len;
{
u_char *ep;
int size;
u_char tag;
#ifdef BOOTP_DEBUG
if (debug)
printf("vend_rfc1048 bootp info. len=%d\n", len);
#endif
ep = cp + len;
/* Step over magic cookie */
cp += sizeof(int);
setenv_(cp, ep, NULL);
while (cp < ep) {
tag = *cp++;
size = *cp++;
if (tag == TAG_END)
break;
if (tag == TAG_SUBNET_MASK) {
bcopy(cp, &smask, sizeof(smask));
}
if (tag == TAG_GATEWAY) {
bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
}
if (tag == TAG_SWAPSERVER) {
/* let it override bp_siaddr */
bcopy(cp, &rootip.s_addr, sizeof(swapip.s_addr));
}
if (tag == TAG_ROOTPATH) {
strncpy(rootpath, (char *)cp, sizeof(rootpath));
rootpath[size] = '\0';
}
if (tag == TAG_HOSTNAME) {
strncpy(hostname, (char *)cp, sizeof(hostname));
hostname[size] = '\0';
}
#ifdef SUPPORT_DHCP
if (tag == TAG_DHCP_MSGTYPE) {
if(*cp != expected_dhcpmsgtype)
return(-1);
dhcp_ok = 1;
}
if (tag == TAG_SERVERID) {
bcopy(cp, &dhcp_serverip.s_addr,
sizeof(dhcp_serverip.s_addr));
}
#endif
cp += size;
}
return(0);
}
#ifdef BOOTP_VEND_CMU
static void
vend_cmu(cp)
u_char *cp;
{
struct cmu_vend *vp;
#ifdef BOOTP_DEBUG
if (debug)
printf("vend_cmu bootp info.\n");
#endif
vp = (struct cmu_vend *)cp;
if (vp->v_smask.s_addr != 0) {
smask = vp->v_smask.s_addr;
}
if (vp->v_dgate.s_addr != 0) {
gateip = vp->v_dgate;
}
}
#endif
#ifdef DHCP_ENV
/*
* Parse DHCP options and store them into kenv variables.
* Original code from Danny Braniss, modifications by Luigi Rizzo.
*
* The parser is driven by tables which specify the type and name of
* each dhcp option and how it appears in kenv.
* The first entry in the list contains the prefix used to set the kenv
* name (including the . if needed), the last entry must have a 0 tag.
* Entries do not need to be sorted though it helps for readability.
*
* Certain vendor-specific tables can be enabled according to DHCP_ENV.
* Set it to 0 if you don't want any.
*/
enum opt_fmt { __NONE = 0,
__8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
__IP, /* IPv4 address */
__TXT, /* C string */
__BYTES, /* byte sequence, printed %02x */
__INDIR, /* name=value */
__ILIST, /* name=value;name=value ... */
__VE, /* vendor specific, recurse */
};
struct dhcp_opt {
uint8_t tag;
uint8_t fmt;
const char *desc;
};
static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
#if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
{0, 0, "FreeBSD"}, /* prefix */
{1, __TXT, "kernel"},
{2, __TXT, "kernelname"},
{3, __TXT, "kernel_options"},
{4, __IP, "usr-ip"},
{5, __TXT, "conf-path"},
{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, ""}, /* 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) {
u_char *s = NULL; /* semicolon ? */
/* skip leading whitespace */
while (*endv && index(" \t\n\r", *endv))
endv++;
vp = index(endv, '='); /* find name=value separator */
if (!vp)
break;
*vp++ = 0;
if (op->fmt == __ILIST && (s = index(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);
setenv(env, buf, 1);
}
}
if (tp != tags) {
char env[128]; /* the string name */
sprintf(env, "%stags", opts[0].desc);
setenv(env, tags, 1);
}
}
#endif /* additional dhcp */
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