[mirror_qemu.git] / slirp / bootp.c

/*
 * QEMU BOOTP/DHCP server
 *
 * Copyright (c) 2004 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "qemu/osdep.h"
#include "slirp.h"

#if defined(_WIN32)
/* Windows ntohl() returns an u_long value.
 * Add a type cast to match the format strings. */
# define ntohl(n) ((uint32_t)ntohl(n))
#endif

/* XXX: only DHCP is supported */

#define LEASE_TIME (24 * 3600)

static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };

#ifdef DEBUG
#define DPRINTF(fmt, ...) \
do if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ##  __VA_ARGS__); fflush(dfd); } while (0)
#else
#define DPRINTF(fmt, ...) do{}while(0)
#endif

static BOOTPClient *get_new_addr(Slirp *slirp, struct in_addr *paddr,
                                 const uint8_t *macaddr)
{
    BOOTPClient *bc;
    int i;

    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
        bc = &slirp->bootp_clients[i];
        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6))
            goto found;
    }
    return NULL;
 found:
    bc = &slirp->bootp_clients[i];
    bc->allocated = 1;
    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
    return bc;
}

static BOOTPClient *request_addr(Slirp *slirp, const struct in_addr *paddr,
                                 const uint8_t *macaddr)
{
    uint32_t req_addr = ntohl(paddr->s_addr);
    uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr);
    BOOTPClient *bc;

    if (req_addr >= dhcp_addr &&
        req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) {
        bc = &slirp->bootp_clients[req_addr - dhcp_addr];
        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) {
            bc->allocated = 1;
            return bc;
        }
    }
    return NULL;
}

static BOOTPClient *find_addr(Slirp *slirp, struct in_addr *paddr,
                              const uint8_t *macaddr)
{
    BOOTPClient *bc;
    int i;

    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
        if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6))
            goto found;
    }
    return NULL;
 found:
    bc = &slirp->bootp_clients[i];
    bc->allocated = 1;
    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
    return bc;
}

static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
                        struct in_addr *preq_addr)
{
    const uint8_t *p, *p_end;
    int len, tag;

    *pmsg_type = 0;
    preq_addr->s_addr = htonl(0L);

    p = bp->bp_vend;
    p_end = p + DHCP_OPT_LEN;
    if (memcmp(p, rfc1533_cookie, 4) != 0)
        return;
    p += 4;
    while (p < p_end) {
        tag = p[0];
        if (tag == RFC1533_PAD) {
            p++;
        } else if (tag == RFC1533_END) {
            break;
        } else {
            p++;
            if (p >= p_end)
                break;
            len = *p++;
            if (p + len > p_end) {
                break;
            }
            DPRINTF("dhcp: tag=%d len=%d\n", tag, len);

            switch(tag) {
            case RFC2132_MSG_TYPE:
                if (len >= 1)
                    *pmsg_type = p[0];
                break;
            case RFC2132_REQ_ADDR:
                if (len >= 4) {
                    memcpy(&(preq_addr->s_addr), p, 4);
                }
                break;
            default:
                break;
            }
            p += len;
        }
    }
    if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) &&
        bp->bp_ciaddr.s_addr) {
        memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
    }
}

static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
{
    BOOTPClient *bc = NULL;
    struct mbuf *m;
    struct bootp_t *rbp;
    struct sockaddr_in saddr, daddr;
    struct in_addr preq_addr;
    int dhcp_msg_type, val;
    uint8_t *q;
    uint8_t *end;
    uint8_t client_ethaddr[ETH_ALEN];

    /* extract exact DHCP msg type */
    dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
    DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
    if (preq_addr.s_addr != htonl(0L))
        DPRINTF(" req_addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
    else
        DPRINTF("\n");

    if (dhcp_msg_type == 0)
        dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */

    if (dhcp_msg_type != DHCPDISCOVER &&
        dhcp_msg_type != DHCPREQUEST)
        return;

    /* Get client's hardware address from bootp request */
    memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN);

    m = m_get(slirp);
    if (!m) {
        return;
    }
    m->m_data += IF_MAXLINKHDR;
    rbp = (struct bootp_t *)m->m_data;
    m->m_data += sizeof(struct udpiphdr);
    memset(rbp, 0, sizeof(struct bootp_t));

    if (dhcp_msg_type == DHCPDISCOVER) {
        if (preq_addr.s_addr != htonl(0L)) {
            bc = request_addr(slirp, &preq_addr, client_ethaddr);
            if (bc) {
                daddr.sin_addr = preq_addr;
            }
        }
        if (!bc) {
         new_addr:
            bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr);
            if (!bc) {
                DPRINTF("no address left\n");
                return;
            }
        }
        memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
    } else if (preq_addr.s_addr != htonl(0L)) {
        bc = request_addr(slirp, &preq_addr, client_ethaddr);
        if (bc) {
            daddr.sin_addr = preq_addr;
            memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
        } else {
            /* DHCPNAKs should be sent to broadcast */
            daddr.sin_addr.s_addr = 0xffffffff;
        }
    } else {
        bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr);
        if (!bc) {
            /* if never assigned, behaves as if it was already
               assigned (windows fix because it remembers its address) */
            goto new_addr;
        }
    }

    /* Update ARP table for this IP address */
    arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr);

    saddr.sin_addr = slirp->vhost_addr;
    saddr.sin_port = htons(BOOTP_SERVER);

    daddr.sin_port = htons(BOOTP_CLIENT);

    rbp->bp_op = BOOTP_REPLY;
    rbp->bp_xid = bp->bp_xid;
    rbp->bp_htype = 1;
    rbp->bp_hlen = 6;
    memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);

    rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
    rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */

    q = rbp->bp_vend;
    end = (uint8_t *)&rbp[1];
    memcpy(q, rfc1533_cookie, 4);
    q += 4;

    if (bc) {
        DPRINTF("%s addr=%08" PRIx32 "\n",
                (dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed",
                ntohl(daddr.sin_addr.s_addr));

        if (dhcp_msg_type == DHCPDISCOVER) {
            *q++ = RFC2132_MSG_TYPE;
            *q++ = 1;
            *q++ = DHCPOFFER;
        } else /* DHCPREQUEST */ {
            *q++ = RFC2132_MSG_TYPE;
            *q++ = 1;
            *q++ = DHCPACK;
        }

        if (slirp->bootp_filename)
            snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
                     slirp->bootp_filename);

        *q++ = RFC2132_SRV_ID;
        *q++ = 4;
        memcpy(q, &saddr.sin_addr, 4);
        q += 4;

        *q++ = RFC1533_NETMASK;
        *q++ = 4;
        memcpy(q, &slirp->vnetwork_mask, 4);
        q += 4;

        if (!slirp->restricted) {
            *q++ = RFC1533_GATEWAY;
            *q++ = 4;
            memcpy(q, &saddr.sin_addr, 4);
            q += 4;

            *q++ = RFC1533_DNS;
            *q++ = 4;
            memcpy(q, &slirp->vnameserver_addr, 4);
            q += 4;
        }

        *q++ = RFC2132_LEASE_TIME;
        *q++ = 4;
        val = htonl(LEASE_TIME);
        memcpy(q, &val, 4);
        q += 4;

        if (*slirp->client_hostname) {
            val = strlen(slirp->client_hostname);
            if (q + val + 2 >= end) {
                g_warning("DHCP packet size exceeded, "
                    "omitting host name option.");
            } else {
                *q++ = RFC1533_HOSTNAME;
                *q++ = val;
                memcpy(q, slirp->client_hostname, val);
                q += val;
            }
        }

        if (slirp->vdomainname) {
            val = strlen(slirp->vdomainname);
            if (q + val + 2 >= end) {
                g_warning("DHCP packet size exceeded, "
                    "omitting domain name option.");
            } else {
                *q++ = RFC1533_DOMAINNAME;
                *q++ = val;
                memcpy(q, slirp->vdomainname, val);
                q += val;
            }
        }

        if (slirp->vdnssearch) {
            val = slirp->vdnssearch_len;
            if (q + val >= end) {
                g_warning("DHCP packet size exceeded, "
                    "omitting domain-search option.");
            } else {
                memcpy(q, slirp->vdnssearch, val);
                q += val;
            }
        }
    } else {
        static const char nak_msg[] = "requested address not available";

        DPRINTF("nak'ed addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));

        *q++ = RFC2132_MSG_TYPE;
        *q++ = 1;
        *q++ = DHCPNAK;

        *q++ = RFC2132_MESSAGE;
        *q++ = sizeof(nak_msg) - 1;
        memcpy(q, nak_msg, sizeof(nak_msg) - 1);
        q += sizeof(nak_msg) - 1;
    }
    assert(q < end);
    *q = RFC1533_END;

    daddr.sin_addr.s_addr = 0xffffffffu;

    m->m_len = sizeof(struct bootp_t) -
        sizeof(struct ip) - sizeof(struct udphdr);
    udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
}

void bootp_input(struct mbuf *m)
{
    struct bootp_t *bp = mtod(m, struct bootp_t *);

    if (bp->bp_op == BOOTP_REQUEST) {
        bootp_reply(m->slirp, bp);
    }
}
Commit	Line	Data
f0cbd3ec FB	1	/*
f0cbd3ec FB	2	* QEMU BOOTP/DHCP server
5fafdf24	3	*
f0cbd3ec	4	* Copyright (c) 2004 Fabrice Bellard
5fafdf24	5	*
f0cbd3ec FB	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
7df7482b	24	#include "qemu/osdep.h"
a9c94277	25	#include "slirp.h"
f0cbd3ec	26
ecc804ca SW	27	#if defined(_WIN32)
	28	/* Windows ntohl() returns an u_long value.
	29	* Add a type cast to match the format strings. */
	30	# define ntohl(n) ((uint32_t)ntohl(n))
	31	#endif
	32
f0cbd3ec FB	33	/* XXX: only DHCP is supported */
f0cbd3ec FB	34
f0cbd3ec FB	35	#define LEASE_TIME (24 * 3600)
f0cbd3ec FB	36
f0cbd3ec FB	37	static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
	38
	39	#ifdef DEBUG
d0f2c4c6	40	#define DPRINTF(fmt, ...) \
9f349498	41	do if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## __VA_ARGS__); fflush(dfd); } while (0)
f0cbd3ec	42	#else
7390cdfb	43	#define DPRINTF(fmt, ...) do{}while(0)
f0cbd3ec FB	44	#endif
f0cbd3ec FB	45
460fec67	46	static BOOTPClient get_new_addr(Slirp slirp, struct in_addr *paddr,
0928a95f	47	const uint8_t *macaddr)
f0cbd3ec FB	48	{
	49	BOOTPClient *bc;
	50	int i;
	51
460fec67 JK	52	for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
460fec67 JK	53	bc = &slirp->bootp_clients[i];
0928a95f	54	if (!bc->allocated \|\| !memcmp(macaddr, bc->macaddr, 6))
f0cbd3ec FB	55	goto found;
	56	}
	57	return NULL;
	58	found:
460fec67	59	bc = &slirp->bootp_clients[i];
f0cbd3ec	60	bc->allocated = 1;
460fec67	61	paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
f0cbd3ec FB	62	return bc;
	63	}
	64
460fec67	65	static BOOTPClient request_addr(Slirp slirp, const struct in_addr *paddr,
b63c7f6b AL	66	const uint8_t *macaddr)
	67	{
	68	uint32_t req_addr = ntohl(paddr->s_addr);
460fec67	69	uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr);
b63c7f6b AL	70	BOOTPClient *bc;
b63c7f6b AL	71
a13a4126	72	if (req_addr >= dhcp_addr &&
460fec67 JK	73	req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) {
460fec67 JK	74	bc = &slirp->bootp_clients[req_addr - dhcp_addr];
b63c7f6b AL	75	if (!bc->allocated \|\| !memcmp(macaddr, bc->macaddr, 6)) {
	76	bc->allocated = 1;
	77	return bc;
	78	}
	79	}
	80	return NULL;
	81	}
	82
460fec67 JK	83	static BOOTPClient find_addr(Slirp slirp, struct in_addr *paddr,
460fec67 JK	84	const uint8_t *macaddr)
512176db FB	85	{
	86	BOOTPClient *bc;
	87	int i;
	88
460fec67 JK	89	for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
460fec67 JK	90	if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6))
512176db FB	91	goto found;
	92	}
	93	return NULL;
	94	found:
460fec67	95	bc = &slirp->bootp_clients[i];
512176db	96	bc->allocated = 1;
460fec67	97	paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
512176db FB	98	return bc;
	99	}
	100
b63c7f6b	101	static void dhcp_decode(const struct bootp_t bp, int pmsg_type,
8aaf42ed	102	struct in_addr *preq_addr)
f0cbd3ec FB	103	{
	104	const uint8_t p, p_end;
	105	int len, tag;
	106
3b46e624	107	*pmsg_type = 0;
8aaf42ed	108	preq_addr->s_addr = htonl(0L);
f0cbd3ec	109
b63c7f6b AL	110	p = bp->bp_vend;
b63c7f6b AL	111	p_end = p + DHCP_OPT_LEN;
f0cbd3ec FB	112	if (memcmp(p, rfc1533_cookie, 4) != 0)
	113	return;
	114	p += 4;
	115	while (p < p_end) {
	116	tag = p[0];
	117	if (tag == RFC1533_PAD) {
5fafdf24	118	p++;
f0cbd3ec FB	119	} else if (tag == RFC1533_END) {
	120	break;
	121	} else {
	122	p++;
	123	if (p >= p_end)
	124	break;
	125	len = *p++;
413d463f PP	126	if (p + len > p_end) {
	127	break;
	128	}
d0f2c4c6	129	DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
f0cbd3ec FB	130
	131	switch(tag) {
	132	case RFC2132_MSG_TYPE:
	133	if (len >= 1)
	134	*pmsg_type = p[0];
	135	break;
b63c7f6b	136	case RFC2132_REQ_ADDR:
8aaf42ed AJ	137	if (len >= 4) {
	138	memcpy(&(preq_addr->s_addr), p, 4);
	139	}
b63c7f6b	140	break;
f0cbd3ec FB	141	default:
	142	break;
	143	}
	144	p += len;
	145	}
	146	}
8aaf42ed AJ	147	if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) &&
	148	bp->bp_ciaddr.s_addr) {
	149	memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
b63c7f6b	150	}
f0cbd3ec FB	151	}
f0cbd3ec FB	152
460fec67	153	static void bootp_reply(Slirp slirp, const struct bootp_t bp)
f0cbd3ec	154	{
b63c7f6b	155	BOOTPClient *bc = NULL;
f0cbd3ec FB	156	struct mbuf *m;
	157	struct bootp_t *rbp;
	158	struct sockaddr_in saddr, daddr;
8aaf42ed	159	struct in_addr preq_addr;
f0cbd3ec FB	160	int dhcp_msg_type, val;
f0cbd3ec FB	161	uint8_t *q;
70b8acfa	162	uint8_t *end;
1a0ca1e1	163	uint8_t client_ethaddr[ETH_ALEN];
f0cbd3ec FB	164
f0cbd3ec FB	165	/* extract exact DHCP msg type */
b63c7f6b	166	dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
d0f2c4c6	167	DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
8aaf42ed	168	if (preq_addr.s_addr != htonl(0L))
ecc804ca	169	DPRINTF(" req_addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
b63c7f6b	170	else
d0f2c4c6	171	DPRINTF("\n");
3b46e624	172
487be8a1 FB	173	if (dhcp_msg_type == 0)
487be8a1 FB	174	dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */
3b46e624	175
5fafdf24	176	if (dhcp_msg_type != DHCPDISCOVER &&
f0cbd3ec FB	177	dhcp_msg_type != DHCPREQUEST)
f0cbd3ec FB	178	return;
1a0ca1e1 FC	179
	180	/* Get client's hardware address from bootp request */
	181	memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN);
3b46e624	182
460fec67 JK	183	m = m_get(slirp);
460fec67 JK	184	if (!m) {
f0cbd3ec	185	return;
460fec67	186	}
9634d903	187	m->m_data += IF_MAXLINKHDR;
f0cbd3ec FB	188	rbp = (struct bootp_t *)m->m_data;
	189	m->m_data += sizeof(struct udpiphdr);
	190	memset(rbp, 0, sizeof(struct bootp_t));
	191
512176db	192	if (dhcp_msg_type == DHCPDISCOVER) {
8aaf42ed	193	if (preq_addr.s_addr != htonl(0L)) {
1a0ca1e1	194	bc = request_addr(slirp, &preq_addr, client_ethaddr);
b63c7f6b	195	if (bc) {
8aaf42ed	196	daddr.sin_addr = preq_addr;
b63c7f6b AL	197	}
b63c7f6b AL	198	}
512176db	199	if (!bc) {
b63c7f6b	200	new_addr:
1a0ca1e1	201	bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr);
b63c7f6b	202	if (!bc) {
d0f2c4c6	203	DPRINTF("no address left\n");
b63c7f6b AL	204	return;
b63c7f6b AL	205	}
512176db	206	}
1a0ca1e1	207	memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
8aaf42ed	208	} else if (preq_addr.s_addr != htonl(0L)) {
1a0ca1e1	209	bc = request_addr(slirp, &preq_addr, client_ethaddr);
b63c7f6b	210	if (bc) {
8aaf42ed	211	daddr.sin_addr = preq_addr;
1a0ca1e1	212	memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
b63c7f6b	213	} else {
90d7416a DG	214	/* DHCPNAKs should be sent to broadcast */
90d7416a DG	215	daddr.sin_addr.s_addr = 0xffffffff;
b63c7f6b	216	}
512176db	217	} else {
460fec67	218	bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr);
512176db	219	if (!bc) {
d981b883 FB	220	/* if never assigned, behaves as if it was already
	221	assigned (windows fix because it remembers its address) */
	222	goto new_addr;
512176db	223	}
f0cbd3ec	224	}
47d5d01a	225
1a0ca1e1 FC	226	/* Update ARP table for this IP address */
	227	arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr);
	228
460fec67	229	saddr.sin_addr = slirp->vhost_addr;
f0cbd3ec FB	230	saddr.sin_port = htons(BOOTP_SERVER);
	231
	232	daddr.sin_port = htons(BOOTP_CLIENT);
	233
	234	rbp->bp_op = BOOTP_REPLY;
	235	rbp->bp_xid = bp->bp_xid;
	236	rbp->bp_htype = 1;
	237	rbp->bp_hlen = 6;
1a0ca1e1	238	memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);
f0cbd3ec	239
e95c8d51 FB	240	rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
e95c8d51 FB	241	rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
f0cbd3ec FB	242
f0cbd3ec FB	243	q = rbp->bp_vend;
70b8acfa	244	end = (uint8_t *)&rbp[1];
f0cbd3ec FB	245	memcpy(q, rfc1533_cookie, 4);
	246	q += 4;
	247
b63c7f6b	248	if (bc) {
ecc804ca	249	DPRINTF("%s addr=%08" PRIx32 "\n",
b63c7f6b AL	250	(dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed",
	251	ntohl(daddr.sin_addr.s_addr));
	252
	253	if (dhcp_msg_type == DHCPDISCOVER) {
	254	*q++ = RFC2132_MSG_TYPE;
	255	*q++ = 1;
	256	*q++ = DHCPOFFER;
	257	} else /* DHCPREQUEST */ {
	258	*q++ = RFC2132_MSG_TYPE;
	259	*q++ = 1;
	260	*q++ = DHCPACK;
	261	}
	262
460fec67	263	if (slirp->bootp_filename)
b63c7f6b	264	snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
460fec67	265	slirp->bootp_filename);
3b46e624	266
f0cbd3ec FB	267	*q++ = RFC2132_SRV_ID;
	268	*q++ = 4;
	269	memcpy(q, &saddr.sin_addr, 4);
	270	q += 4;
	271
	272	*q++ = RFC1533_NETMASK;
	273	*q++ = 4;
460fec67	274	memcpy(q, &slirp->vnetwork_mask, 4);
a13a4126	275	q += 4;
3b46e624	276
460fec67	277	if (!slirp->restricted) {
a9ba3a85 AL	278	*q++ = RFC1533_GATEWAY;
	279	*q++ = 4;
	280	memcpy(q, &saddr.sin_addr, 4);
	281	q += 4;
	282
	283	*q++ = RFC1533_DNS;
	284	*q++ = 4;
460fec67	285	memcpy(q, &slirp->vnameserver_addr, 4);
a9ba3a85 AL	286	q += 4;
a9ba3a85 AL	287	}
f0cbd3ec FB	288
	289	*q++ = RFC2132_LEASE_TIME;
	290	*q++ = 4;
	291	val = htonl(LEASE_TIME);
	292	memcpy(q, &val, 4);
	293	q += 4;
115defd1	294
460fec67 JK	295	if (*slirp->client_hostname) {
460fec67 JK	296	val = strlen(slirp->client_hostname);
70b8acfa FZ	297	if (q + val + 2 >= end) {
	298	g_warning("DHCP packet size exceeded, "
	299	"omitting host name option.");
	300	} else {
	301	*q++ = RFC1533_HOSTNAME;
	302	*q++ = val;
	303	memcpy(q, slirp->client_hostname, val);
	304	q += val;
	305	}
115defd1	306	}
63d2960b	307
f18d1375 BD	308	if (slirp->vdomainname) {
f18d1375 BD	309	val = strlen(slirp->vdomainname);
70b8acfa FZ	310	if (q + val + 2 >= end) {
	311	g_warning("DHCP packet size exceeded, "
	312	"omitting domain name option.");
	313	} else {
	314	*q++ = RFC1533_DOMAINNAME;
	315	*q++ = val;
	316	memcpy(q, slirp->vdomainname, val);
	317	q += val;
	318	}
f18d1375 BD	319	}
f18d1375 BD	320
63d2960b	321	if (slirp->vdnssearch) {
63d2960b	322	val = slirp->vdnssearch_len;
70b8acfa	323	if (q + val >= end) {
63d2960b KS	324	g_warning("DHCP packet size exceeded, "
	325	"omitting domain-search option.");
	326	} else {
	327	memcpy(q, slirp->vdnssearch, val);
	328	q += val;
	329	}
	330	}
b63c7f6b AL	331	} else {
	332	static const char nak_msg[] = "requested address not available";
	333
ecc804ca	334	DPRINTF("nak'ed addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
b63c7f6b AL	335
	336	*q++ = RFC2132_MSG_TYPE;
	337	*q++ = 1;
	338	*q++ = DHCPNAK;
	339
	340	*q++ = RFC2132_MESSAGE;
	341	*q++ = sizeof(nak_msg) - 1;
	342	memcpy(q, nak_msg, sizeof(nak_msg) - 1);
	343	q += sizeof(nak_msg) - 1;
f0cbd3ec	344	}
70b8acfa	345	assert(q < end);
369c86e7	346	*q = RFC1533_END;
3b46e624	347
b63c7f6b AL	348	daddr.sin_addr.s_addr = 0xffffffffu;
b63c7f6b AL	349
5fafdf24	350	m->m_len = sizeof(struct bootp_t) -
44bbf73f	351	sizeof(struct ip) - sizeof(struct udphdr);
5379229a	352	udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
f0cbd3ec FB	353	}
	354
	355	void bootp_input(struct mbuf *m)
	356	{
101c5935	357	struct bootp_t bp = mtod(m, struct bootp_t );
f0cbd3ec FB	358
f0cbd3ec FB	359	if (bp->bp_op == BOOTP_REQUEST) {
460fec67	360	bootp_reply(m->slirp, bp);
f0cbd3ec FB	361	}
f0cbd3ec FB	362	}