[mirror_qemu.git] / slirp / src / 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 "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 };

#define DPRINTF(fmt, ...) DEBUG_CALL(fmt, ##__VA_ARGS__)

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->tftp_server_name) {
            val = strlen(slirp->tftp_server_name);
            if (q + val + 2 >= end) {
                g_warning("DHCP packet size exceeded, "
                    "omitting tftp-server-name option.");
            } else {
                *q++ = RFC2132_TFTP_SERVER_NAME;
                *q++ = val;
                memcpy(q, slirp->tftp_server_name, 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	*/
a9c94277	24	#include "slirp.h"
f0cbd3ec	25
ecc804ca SW	26	#if defined(_WIN32)
	27	/* Windows ntohl() returns an u_long value.
	28	* Add a type cast to match the format strings. */
	29	# define ntohl(n) ((uint32_t)ntohl(n))
	30	#endif
	31
f0cbd3ec FB	32	/* XXX: only DHCP is supported */
f0cbd3ec FB	33
f0cbd3ec FB	34	#define LEASE_TIME (24 * 3600)
f0cbd3ec FB	35
f0cbd3ec FB	36	static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
f0cbd3ec FB	37
2afbb788	38	#define DPRINTF(fmt, ...) DEBUG_CALL(fmt, ##__VA_ARGS__)
f0cbd3ec	39
460fec67	40	static BOOTPClient get_new_addr(Slirp slirp, struct in_addr *paddr,
0928a95f	41	const uint8_t *macaddr)
f0cbd3ec FB	42	{
	43	BOOTPClient *bc;
	44	int i;
	45
460fec67 JK	46	for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
460fec67 JK	47	bc = &slirp->bootp_clients[i];
0928a95f	48	if (!bc->allocated \|\| !memcmp(macaddr, bc->macaddr, 6))
f0cbd3ec FB	49	goto found;
	50	}
	51	return NULL;
	52	found:
460fec67	53	bc = &slirp->bootp_clients[i];
f0cbd3ec	54	bc->allocated = 1;
460fec67	55	paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
f0cbd3ec FB	56	return bc;
	57	}
	58
460fec67	59	static BOOTPClient request_addr(Slirp slirp, const struct in_addr *paddr,
b63c7f6b AL	60	const uint8_t *macaddr)
	61	{
	62	uint32_t req_addr = ntohl(paddr->s_addr);
460fec67	63	uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr);
b63c7f6b AL	64	BOOTPClient *bc;
b63c7f6b AL	65
a13a4126	66	if (req_addr >= dhcp_addr &&
460fec67 JK	67	req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) {
460fec67 JK	68	bc = &slirp->bootp_clients[req_addr - dhcp_addr];
b63c7f6b AL	69	if (!bc->allocated \|\| !memcmp(macaddr, bc->macaddr, 6)) {
	70	bc->allocated = 1;
	71	return bc;
	72	}
	73	}
	74	return NULL;
	75	}
	76
460fec67 JK	77	static BOOTPClient find_addr(Slirp slirp, struct in_addr *paddr,
460fec67 JK	78	const uint8_t *macaddr)
512176db FB	79	{
	80	BOOTPClient *bc;
	81	int i;
	82
460fec67 JK	83	for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
460fec67 JK	84	if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6))
512176db FB	85	goto found;
	86	}
	87	return NULL;
	88	found:
460fec67	89	bc = &slirp->bootp_clients[i];
512176db	90	bc->allocated = 1;
460fec67	91	paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
512176db FB	92	return bc;
	93	}
	94
b63c7f6b	95	static void dhcp_decode(const struct bootp_t bp, int pmsg_type,
8aaf42ed	96	struct in_addr *preq_addr)
f0cbd3ec FB	97	{
	98	const uint8_t p, p_end;
	99	int len, tag;
	100
3b46e624	101	*pmsg_type = 0;
8aaf42ed	102	preq_addr->s_addr = htonl(0L);
f0cbd3ec	103
b63c7f6b AL	104	p = bp->bp_vend;
b63c7f6b AL	105	p_end = p + DHCP_OPT_LEN;
f0cbd3ec FB	106	if (memcmp(p, rfc1533_cookie, 4) != 0)
	107	return;
	108	p += 4;
	109	while (p < p_end) {
	110	tag = p[0];
	111	if (tag == RFC1533_PAD) {
5fafdf24	112	p++;
f0cbd3ec FB	113	} else if (tag == RFC1533_END) {
	114	break;
	115	} else {
	116	p++;
	117	if (p >= p_end)
	118	break;
	119	len = *p++;
413d463f PP	120	if (p + len > p_end) {
	121	break;
	122	}
d0f2c4c6	123	DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
f0cbd3ec FB	124
	125	switch(tag) {
	126	case RFC2132_MSG_TYPE:
	127	if (len >= 1)
	128	*pmsg_type = p[0];
	129	break;
b63c7f6b	130	case RFC2132_REQ_ADDR:
8aaf42ed AJ	131	if (len >= 4) {
	132	memcpy(&(preq_addr->s_addr), p, 4);
	133	}
b63c7f6b	134	break;
f0cbd3ec FB	135	default:
	136	break;
	137	}
	138	p += len;
	139	}
	140	}
8aaf42ed AJ	141	if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) &&
	142	bp->bp_ciaddr.s_addr) {
	143	memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
b63c7f6b	144	}
f0cbd3ec FB	145	}
f0cbd3ec FB	146
460fec67	147	static void bootp_reply(Slirp slirp, const struct bootp_t bp)
f0cbd3ec	148	{
b63c7f6b	149	BOOTPClient *bc = NULL;
f0cbd3ec FB	150	struct mbuf *m;
	151	struct bootp_t *rbp;
	152	struct sockaddr_in saddr, daddr;
8aaf42ed	153	struct in_addr preq_addr;
f0cbd3ec FB	154	int dhcp_msg_type, val;
f0cbd3ec FB	155	uint8_t *q;
6e157a03	156	uint8_t *end;
1a0ca1e1	157	uint8_t client_ethaddr[ETH_ALEN];
f0cbd3ec FB	158
f0cbd3ec FB	159	/* extract exact DHCP msg type */
b63c7f6b	160	dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
d0f2c4c6	161	DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
8aaf42ed	162	if (preq_addr.s_addr != htonl(0L))
ecc804ca	163	DPRINTF(" req_addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
c2b3350b	164	else {
d0f2c4c6	165	DPRINTF("\n");
c2b3350b	166	}
3b46e624	167
487be8a1 FB	168	if (dhcp_msg_type == 0)
487be8a1 FB	169	dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */
3b46e624	170
5fafdf24	171	if (dhcp_msg_type != DHCPDISCOVER &&
f0cbd3ec FB	172	dhcp_msg_type != DHCPREQUEST)
f0cbd3ec FB	173	return;
1a0ca1e1 FC	174
	175	/* Get client's hardware address from bootp request */
	176	memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN);
3b46e624	177
460fec67 JK	178	m = m_get(slirp);
460fec67 JK	179	if (!m) {
f0cbd3ec	180	return;
460fec67	181	}
9634d903	182	m->m_data += IF_MAXLINKHDR;
f0cbd3ec FB	183	rbp = (struct bootp_t *)m->m_data;
	184	m->m_data += sizeof(struct udpiphdr);
	185	memset(rbp, 0, sizeof(struct bootp_t));
	186
512176db	187	if (dhcp_msg_type == DHCPDISCOVER) {
8aaf42ed	188	if (preq_addr.s_addr != htonl(0L)) {
1a0ca1e1	189	bc = request_addr(slirp, &preq_addr, client_ethaddr);
b63c7f6b	190	if (bc) {
8aaf42ed	191	daddr.sin_addr = preq_addr;
b63c7f6b AL	192	}
b63c7f6b AL	193	}
512176db	194	if (!bc) {
b63c7f6b	195	new_addr:
1a0ca1e1	196	bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr);
b63c7f6b	197	if (!bc) {
d0f2c4c6	198	DPRINTF("no address left\n");
b63c7f6b AL	199	return;
b63c7f6b AL	200	}
512176db	201	}
1a0ca1e1	202	memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
8aaf42ed	203	} else if (preq_addr.s_addr != htonl(0L)) {
1a0ca1e1	204	bc = request_addr(slirp, &preq_addr, client_ethaddr);
b63c7f6b	205	if (bc) {
8aaf42ed	206	daddr.sin_addr = preq_addr;
1a0ca1e1	207	memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
b63c7f6b	208	} else {
90d7416a DG	209	/* DHCPNAKs should be sent to broadcast */
90d7416a DG	210	daddr.sin_addr.s_addr = 0xffffffff;
b63c7f6b	211	}
512176db	212	} else {
460fec67	213	bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr);
512176db	214	if (!bc) {
d981b883 FB	215	/* if never assigned, behaves as if it was already
	216	assigned (windows fix because it remembers its address) */
	217	goto new_addr;
512176db	218	}
f0cbd3ec	219	}
47d5d01a	220
1a0ca1e1 FC	221	/* Update ARP table for this IP address */
	222	arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr);
	223
460fec67	224	saddr.sin_addr = slirp->vhost_addr;
f0cbd3ec FB	225	saddr.sin_port = htons(BOOTP_SERVER);
	226
	227	daddr.sin_port = htons(BOOTP_CLIENT);
	228
	229	rbp->bp_op = BOOTP_REPLY;
	230	rbp->bp_xid = bp->bp_xid;
	231	rbp->bp_htype = 1;
	232	rbp->bp_hlen = 6;
1a0ca1e1	233	memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);
f0cbd3ec	234
e95c8d51 FB	235	rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
e95c8d51 FB	236	rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
f0cbd3ec FB	237
f0cbd3ec FB	238	q = rbp->bp_vend;
6e157a03	239	end = (uint8_t *)&rbp[1];
f0cbd3ec FB	240	memcpy(q, rfc1533_cookie, 4);
	241	q += 4;
	242
b63c7f6b	243	if (bc) {
ecc804ca	244	DPRINTF("%s addr=%08" PRIx32 "\n",
b63c7f6b AL	245	(dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed",
	246	ntohl(daddr.sin_addr.s_addr));
	247
	248	if (dhcp_msg_type == DHCPDISCOVER) {
	249	*q++ = RFC2132_MSG_TYPE;
	250	*q++ = 1;
	251	*q++ = DHCPOFFER;
	252	} else /* DHCPREQUEST */ {
	253	*q++ = RFC2132_MSG_TYPE;
	254	*q++ = 1;
	255	*q++ = DHCPACK;
	256	}
	257
460fec67	258	if (slirp->bootp_filename)
b63c7f6b	259	snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
460fec67	260	slirp->bootp_filename);
3b46e624	261
f0cbd3ec FB	262	*q++ = RFC2132_SRV_ID;
	263	*q++ = 4;
	264	memcpy(q, &saddr.sin_addr, 4);
	265	q += 4;
	266
	267	*q++ = RFC1533_NETMASK;
	268	*q++ = 4;
460fec67	269	memcpy(q, &slirp->vnetwork_mask, 4);
a13a4126	270	q += 4;
3b46e624	271
460fec67	272	if (!slirp->restricted) {
a9ba3a85 AL	273	*q++ = RFC1533_GATEWAY;
	274	*q++ = 4;
	275	memcpy(q, &saddr.sin_addr, 4);
	276	q += 4;
	277
	278	*q++ = RFC1533_DNS;
	279	*q++ = 4;
460fec67	280	memcpy(q, &slirp->vnameserver_addr, 4);
a9ba3a85 AL	281	q += 4;
a9ba3a85 AL	282	}
f0cbd3ec FB	283
	284	*q++ = RFC2132_LEASE_TIME;
	285	*q++ = 4;
	286	val = htonl(LEASE_TIME);
	287	memcpy(q, &val, 4);
	288	q += 4;
115defd1	289
460fec67 JK	290	if (*slirp->client_hostname) {
460fec67 JK	291	val = strlen(slirp->client_hostname);
6e157a03 FZ	292	if (q + val + 2 >= end) {
	293	g_warning("DHCP packet size exceeded, "
	294	"omitting host name option.");
	295	} else {
	296	*q++ = RFC1533_HOSTNAME;
	297	*q++ = val;
	298	memcpy(q, slirp->client_hostname, val);
	299	q += val;
	300	}
115defd1	301	}
63d2960b	302
f18d1375 BD	303	if (slirp->vdomainname) {
f18d1375 BD	304	val = strlen(slirp->vdomainname);
6e157a03 FZ	305	if (q + val + 2 >= end) {
	306	g_warning("DHCP packet size exceeded, "
	307	"omitting domain name option.");
	308	} else {
	309	*q++ = RFC1533_DOMAINNAME;
	310	*q++ = val;
	311	memcpy(q, slirp->vdomainname, val);
	312	q += val;
	313	}
f18d1375 BD	314	}
f18d1375 BD	315
0fca92b9 FZ	316	if (slirp->tftp_server_name) {
	317	val = strlen(slirp->tftp_server_name);
	318	if (q + val + 2 >= end) {
	319	g_warning("DHCP packet size exceeded, "
	320	"omitting tftp-server-name option.");
	321	} else {
	322	*q++ = RFC2132_TFTP_SERVER_NAME;
	323	*q++ = val;
	324	memcpy(q, slirp->tftp_server_name, val);
	325	q += val;
	326	}
	327	}
	328
63d2960b	329	if (slirp->vdnssearch) {
63d2960b	330	val = slirp->vdnssearch_len;
6e157a03	331	if (q + val >= end) {
63d2960b KS	332	g_warning("DHCP packet size exceeded, "
	333	"omitting domain-search option.");
	334	} else {
	335	memcpy(q, slirp->vdnssearch, val);
	336	q += val;
	337	}
	338	}
b63c7f6b AL	339	} else {
	340	static const char nak_msg[] = "requested address not available";
	341
ecc804ca	342	DPRINTF("nak'ed addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr));
b63c7f6b AL	343
	344	*q++ = RFC2132_MSG_TYPE;
	345	*q++ = 1;
	346	*q++ = DHCPNAK;
	347
	348	*q++ = RFC2132_MESSAGE;
	349	*q++ = sizeof(nak_msg) - 1;
	350	memcpy(q, nak_msg, sizeof(nak_msg) - 1);
	351	q += sizeof(nak_msg) - 1;
f0cbd3ec	352	}
6e157a03	353	assert(q < end);
369c86e7	354	*q = RFC1533_END;
3b46e624	355
b63c7f6b AL	356	daddr.sin_addr.s_addr = 0xffffffffu;
b63c7f6b AL	357
5fafdf24	358	m->m_len = sizeof(struct bootp_t) -
44bbf73f	359	sizeof(struct ip) - sizeof(struct udphdr);
5379229a	360	udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
f0cbd3ec FB	361	}
	362
	363	void bootp_input(struct mbuf *m)
	364	{
101c5935	365	struct bootp_t bp = mtod(m, struct bootp_t );
f0cbd3ec FB	366
f0cbd3ec FB	367	if (bp->bp_op == BOOTP_REQUEST) {
460fec67	368	bootp_reply(m->slirp, bp);
f0cbd3ec FB	369	}
f0cbd3ec FB	370	}