2 * QEMU BOOTP/DHCP server
4 * Copyright (c) 2004 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
26 /* XXX: only DHCP is supported */
32 #define LEASE_TIME (24 * 3600)
38 BOOTPClient bootp_clients[NB_ADDR];
40 static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
43 #define dprintf(fmt, args...) \
44 if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## args); fflush(dfd); }
46 #define dprintf(fmt, args...)
49 static BOOTPClient *get_new_addr(struct in_addr *paddr)
54 for(i = 0; i < NB_ADDR; i++) {
55 if (!bootp_clients[i].allocated)
60 bc = &bootp_clients[i];
62 paddr->s_addr = htonl(ntohl(special_addr.s_addr) | (i + START_ADDR));
66 static void dhcp_decode(const uint8_t *buf, int size,
69 const uint8_t *p, *p_end;
78 if (memcmp(p, rfc1533_cookie, 4) != 0)
83 if (tag == RFC1533_PAD) {
85 } else if (tag == RFC1533_END) {
92 dprintf("dhcp: tag=0x%02x len=%d\n", tag, len);
95 case RFC2132_MSG_TYPE:
107 static void bootp_reply(struct bootp_t *bp)
112 struct sockaddr_in saddr, daddr;
113 struct in_addr dns_addr;
114 int dhcp_msg_type, val;
117 /* extract exact DHCP msg type */
118 dhcp_decode(bp->bp_vend, DHCP_OPT_LEN, &dhcp_msg_type);
119 dprintf("bootp packet op=%d msgtype=%d\n", bp->bp_op, dhcp_msg_type);
121 if (dhcp_msg_type != DHCPDISCOVER &&
122 dhcp_msg_type != DHCPREQUEST)
124 /* XXX: this is a hack to get the client mac address */
125 memcpy(client_ethaddr, bp->bp_hwaddr, 6);
127 if ((m = m_get()) == NULL)
129 m->m_data += if_maxlinkhdr;
130 rbp = (struct bootp_t *)m->m_data;
131 m->m_data += sizeof(struct udpiphdr);
132 memset(rbp, 0, sizeof(struct bootp_t));
134 bc = get_new_addr(&daddr.sin_addr);
136 dprintf("no address left\n");
139 dprintf("offered addr=%08x\n", ntohl(daddr.sin_addr.s_addr));
141 saddr.sin_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
142 saddr.sin_port = htons(BOOTP_SERVER);
144 daddr.sin_port = htons(BOOTP_CLIENT);
146 rbp->bp_op = BOOTP_REPLY;
147 rbp->bp_xid = bp->bp_xid;
150 memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, 6);
152 rbp->bp_yiaddr = daddr.sin_addr; /* IP address */
155 memcpy(q, rfc1533_cookie, 4);
158 if (dhcp_msg_type == DHCPDISCOVER) {
159 *q++ = RFC2132_MSG_TYPE;
162 } else if (dhcp_msg_type == DHCPREQUEST) {
163 *q++ = RFC2132_MSG_TYPE;
168 if (dhcp_msg_type == DHCPDISCOVER ||
169 dhcp_msg_type == DHCPREQUEST) {
170 *q++ = RFC2132_SRV_ID;
172 memcpy(q, &saddr.sin_addr, 4);
175 *q++ = RFC1533_NETMASK;
182 *q++ = RFC1533_GATEWAY;
184 memcpy(q, &saddr.sin_addr, 4);
189 dns_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_DNS);
190 memcpy(q, &dns_addr, 4);
193 *q++ = RFC2132_LEASE_TIME;
195 val = htonl(LEASE_TIME);
201 m->m_len = sizeof(struct bootp_t);
202 udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
205 void bootp_input(struct mbuf *m)
207 struct bootp_t *bp = (struct bootp_t *)m->m_data;
209 if (bp->bp_op == BOOTP_REQUEST) {