root / slirp / bootp.c @ 90d7416a
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1 | f0cbd3ec | bellard | /*
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2 | f0cbd3ec | bellard | * QEMU BOOTP/DHCP server
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3 | 5fafdf24 | ths | *
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4 | f0cbd3ec | bellard | * Copyright (c) 2004 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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6 | f0cbd3ec | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | f0cbd3ec | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | f0cbd3ec | bellard | * in the Software without restriction, including without limitation the rights
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9 | f0cbd3ec | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | f0cbd3ec | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | f0cbd3ec | bellard | * furnished to do so, subject to the following conditions:
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12 | f0cbd3ec | bellard | *
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13 | f0cbd3ec | bellard | * The above copyright notice and this permission notice shall be included in
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14 | f0cbd3ec | bellard | * all copies or substantial portions of the Software.
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15 | f0cbd3ec | bellard | *
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16 | f0cbd3ec | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | f0cbd3ec | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | f0cbd3ec | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | f0cbd3ec | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | f0cbd3ec | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | f0cbd3ec | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | f0cbd3ec | bellard | * THE SOFTWARE.
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23 | f0cbd3ec | bellard | */
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24 | f0cbd3ec | bellard | #include <slirp.h> |
25 | f0cbd3ec | bellard | |
26 | f0cbd3ec | bellard | /* XXX: only DHCP is supported */
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27 | f0cbd3ec | bellard | |
28 | f0cbd3ec | bellard | #define LEASE_TIME (24 * 3600) |
29 | f0cbd3ec | bellard | |
30 | f0cbd3ec | bellard | static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE }; |
31 | f0cbd3ec | bellard | |
32 | f0cbd3ec | bellard | #ifdef DEBUG
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33 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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34 | 9f349498 | Jan Kiszka | do if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## __VA_ARGS__); fflush(dfd); } while (0) |
35 | f0cbd3ec | bellard | #else
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36 | 7390cdfb | Jes Sorensen | #define DPRINTF(fmt, ...) do{}while(0) |
37 | f0cbd3ec | bellard | #endif
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38 | f0cbd3ec | bellard | |
39 | 460fec67 | Jan Kiszka | static BOOTPClient *get_new_addr(Slirp *slirp, struct in_addr *paddr, |
40 | 0928a95f | Jan Kiszka | const uint8_t *macaddr)
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41 | f0cbd3ec | bellard | { |
42 | f0cbd3ec | bellard | BOOTPClient *bc; |
43 | f0cbd3ec | bellard | int i;
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44 | f0cbd3ec | bellard | |
45 | 460fec67 | Jan Kiszka | for(i = 0; i < NB_BOOTP_CLIENTS; i++) { |
46 | 460fec67 | Jan Kiszka | bc = &slirp->bootp_clients[i]; |
47 | 0928a95f | Jan Kiszka | if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) |
48 | f0cbd3ec | bellard | goto found;
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49 | f0cbd3ec | bellard | } |
50 | f0cbd3ec | bellard | return NULL; |
51 | f0cbd3ec | bellard | found:
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52 | 460fec67 | Jan Kiszka | bc = &slirp->bootp_clients[i]; |
53 | f0cbd3ec | bellard | bc->allocated = 1;
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54 | 460fec67 | Jan Kiszka | paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i); |
55 | f0cbd3ec | bellard | return bc;
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56 | f0cbd3ec | bellard | } |
57 | f0cbd3ec | bellard | |
58 | 460fec67 | Jan Kiszka | static BOOTPClient *request_addr(Slirp *slirp, const struct in_addr *paddr, |
59 | b63c7f6b | aliguori | const uint8_t *macaddr)
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60 | b63c7f6b | aliguori | { |
61 | b63c7f6b | aliguori | uint32_t req_addr = ntohl(paddr->s_addr); |
62 | 460fec67 | Jan Kiszka | uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr); |
63 | b63c7f6b | aliguori | BOOTPClient *bc; |
64 | b63c7f6b | aliguori | |
65 | a13a4126 | Jan Kiszka | if (req_addr >= dhcp_addr &&
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66 | 460fec67 | Jan Kiszka | req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) { |
67 | 460fec67 | Jan Kiszka | bc = &slirp->bootp_clients[req_addr - dhcp_addr]; |
68 | b63c7f6b | aliguori | if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) { |
69 | b63c7f6b | aliguori | bc->allocated = 1;
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70 | b63c7f6b | aliguori | return bc;
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71 | b63c7f6b | aliguori | } |
72 | b63c7f6b | aliguori | } |
73 | b63c7f6b | aliguori | return NULL; |
74 | b63c7f6b | aliguori | } |
75 | b63c7f6b | aliguori | |
76 | 460fec67 | Jan Kiszka | static BOOTPClient *find_addr(Slirp *slirp, struct in_addr *paddr, |
77 | 460fec67 | Jan Kiszka | const uint8_t *macaddr)
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78 | 512176db | bellard | { |
79 | 512176db | bellard | BOOTPClient *bc; |
80 | 512176db | bellard | int i;
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81 | 512176db | bellard | |
82 | 460fec67 | Jan Kiszka | for(i = 0; i < NB_BOOTP_CLIENTS; i++) { |
83 | 460fec67 | Jan Kiszka | if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6)) |
84 | 512176db | bellard | goto found;
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85 | 512176db | bellard | } |
86 | 512176db | bellard | return NULL; |
87 | 512176db | bellard | found:
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88 | 460fec67 | Jan Kiszka | bc = &slirp->bootp_clients[i]; |
89 | 512176db | bellard | bc->allocated = 1;
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90 | 460fec67 | Jan Kiszka | paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i); |
91 | 512176db | bellard | return bc;
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92 | 512176db | bellard | } |
93 | 512176db | bellard | |
94 | b63c7f6b | aliguori | static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type, |
95 | 8aaf42ed | Aurelien Jarno | struct in_addr *preq_addr)
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96 | f0cbd3ec | bellard | { |
97 | f0cbd3ec | bellard | const uint8_t *p, *p_end;
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98 | f0cbd3ec | bellard | int len, tag;
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99 | f0cbd3ec | bellard | |
100 | 3b46e624 | ths | *pmsg_type = 0;
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101 | 8aaf42ed | Aurelien Jarno | preq_addr->s_addr = htonl(0L);
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102 | f0cbd3ec | bellard | |
103 | b63c7f6b | aliguori | p = bp->bp_vend; |
104 | b63c7f6b | aliguori | p_end = p + DHCP_OPT_LEN; |
105 | f0cbd3ec | bellard | if (memcmp(p, rfc1533_cookie, 4) != 0) |
106 | f0cbd3ec | bellard | return;
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107 | f0cbd3ec | bellard | p += 4;
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108 | f0cbd3ec | bellard | while (p < p_end) {
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109 | f0cbd3ec | bellard | tag = p[0];
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110 | f0cbd3ec | bellard | if (tag == RFC1533_PAD) {
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111 | 5fafdf24 | ths | p++; |
112 | f0cbd3ec | bellard | } else if (tag == RFC1533_END) { |
113 | f0cbd3ec | bellard | break;
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114 | f0cbd3ec | bellard | } else {
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115 | f0cbd3ec | bellard | p++; |
116 | f0cbd3ec | bellard | if (p >= p_end)
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117 | f0cbd3ec | bellard | break;
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118 | f0cbd3ec | bellard | len = *p++; |
119 | d0f2c4c6 | malc | DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
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120 | f0cbd3ec | bellard | |
121 | f0cbd3ec | bellard | switch(tag) {
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122 | f0cbd3ec | bellard | case RFC2132_MSG_TYPE:
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123 | f0cbd3ec | bellard | if (len >= 1) |
124 | f0cbd3ec | bellard | *pmsg_type = p[0];
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125 | f0cbd3ec | bellard | break;
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126 | b63c7f6b | aliguori | case RFC2132_REQ_ADDR:
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127 | 8aaf42ed | Aurelien Jarno | if (len >= 4) { |
128 | 8aaf42ed | Aurelien Jarno | memcpy(&(preq_addr->s_addr), p, 4);
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129 | 8aaf42ed | Aurelien Jarno | } |
130 | b63c7f6b | aliguori | break;
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131 | f0cbd3ec | bellard | default:
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132 | f0cbd3ec | bellard | break;
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133 | f0cbd3ec | bellard | } |
134 | f0cbd3ec | bellard | p += len; |
135 | f0cbd3ec | bellard | } |
136 | f0cbd3ec | bellard | } |
137 | 8aaf42ed | Aurelien Jarno | if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) && |
138 | 8aaf42ed | Aurelien Jarno | bp->bp_ciaddr.s_addr) { |
139 | 8aaf42ed | Aurelien Jarno | memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
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140 | b63c7f6b | aliguori | } |
141 | f0cbd3ec | bellard | } |
142 | f0cbd3ec | bellard | |
143 | 460fec67 | Jan Kiszka | static void bootp_reply(Slirp *slirp, const struct bootp_t *bp) |
144 | f0cbd3ec | bellard | { |
145 | b63c7f6b | aliguori | BOOTPClient *bc = NULL;
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146 | f0cbd3ec | bellard | struct mbuf *m;
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147 | f0cbd3ec | bellard | struct bootp_t *rbp;
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148 | f0cbd3ec | bellard | struct sockaddr_in saddr, daddr;
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149 | 8aaf42ed | Aurelien Jarno | struct in_addr preq_addr;
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150 | f0cbd3ec | bellard | int dhcp_msg_type, val;
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151 | f0cbd3ec | bellard | uint8_t *q; |
152 | 1a0ca1e1 | Fabien Chouteau | uint8_t client_ethaddr[ETH_ALEN]; |
153 | f0cbd3ec | bellard | |
154 | f0cbd3ec | bellard | /* extract exact DHCP msg type */
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155 | b63c7f6b | aliguori | dhcp_decode(bp, &dhcp_msg_type, &preq_addr); |
156 | d0f2c4c6 | malc | DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
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157 | 8aaf42ed | Aurelien Jarno | if (preq_addr.s_addr != htonl(0L)) |
158 | 8aaf42ed | Aurelien Jarno | DPRINTF(" req_addr=%08x\n", ntohl(preq_addr.s_addr));
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159 | b63c7f6b | aliguori | else
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160 | d0f2c4c6 | malc | DPRINTF("\n");
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161 | 3b46e624 | ths | |
162 | 487be8a1 | bellard | if (dhcp_msg_type == 0) |
163 | 487be8a1 | bellard | dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */
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164 | 3b46e624 | ths | |
165 | 5fafdf24 | ths | if (dhcp_msg_type != DHCPDISCOVER &&
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166 | f0cbd3ec | bellard | dhcp_msg_type != DHCPREQUEST) |
167 | f0cbd3ec | bellard | return;
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168 | 1a0ca1e1 | Fabien Chouteau | |
169 | 1a0ca1e1 | Fabien Chouteau | /* Get client's hardware address from bootp request */
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170 | 1a0ca1e1 | Fabien Chouteau | memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN); |
171 | 3b46e624 | ths | |
172 | 460fec67 | Jan Kiszka | m = m_get(slirp); |
173 | 460fec67 | Jan Kiszka | if (!m) {
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174 | f0cbd3ec | bellard | return;
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175 | 460fec67 | Jan Kiszka | } |
176 | 9634d903 | blueswir1 | m->m_data += IF_MAXLINKHDR; |
177 | f0cbd3ec | bellard | rbp = (struct bootp_t *)m->m_data;
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178 | f0cbd3ec | bellard | m->m_data += sizeof(struct udpiphdr); |
179 | f0cbd3ec | bellard | memset(rbp, 0, sizeof(struct bootp_t)); |
180 | f0cbd3ec | bellard | |
181 | 512176db | bellard | if (dhcp_msg_type == DHCPDISCOVER) {
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182 | 8aaf42ed | Aurelien Jarno | if (preq_addr.s_addr != htonl(0L)) { |
183 | 1a0ca1e1 | Fabien Chouteau | bc = request_addr(slirp, &preq_addr, client_ethaddr); |
184 | b63c7f6b | aliguori | if (bc) {
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185 | 8aaf42ed | Aurelien Jarno | daddr.sin_addr = preq_addr; |
186 | b63c7f6b | aliguori | } |
187 | b63c7f6b | aliguori | } |
188 | 512176db | bellard | if (!bc) {
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189 | b63c7f6b | aliguori | new_addr:
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190 | 1a0ca1e1 | Fabien Chouteau | bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr); |
191 | b63c7f6b | aliguori | if (!bc) {
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192 | d0f2c4c6 | malc | DPRINTF("no address left\n");
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193 | b63c7f6b | aliguori | return;
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194 | b63c7f6b | aliguori | } |
195 | 512176db | bellard | } |
196 | 1a0ca1e1 | Fabien Chouteau | memcpy(bc->macaddr, client_ethaddr, ETH_ALEN); |
197 | 8aaf42ed | Aurelien Jarno | } else if (preq_addr.s_addr != htonl(0L)) { |
198 | 1a0ca1e1 | Fabien Chouteau | bc = request_addr(slirp, &preq_addr, client_ethaddr); |
199 | b63c7f6b | aliguori | if (bc) {
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200 | 8aaf42ed | Aurelien Jarno | daddr.sin_addr = preq_addr; |
201 | 1a0ca1e1 | Fabien Chouteau | memcpy(bc->macaddr, client_ethaddr, ETH_ALEN); |
202 | b63c7f6b | aliguori | } else {
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203 | 90d7416a | David Gibson | /* DHCPNAKs should be sent to broadcast */
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204 | 90d7416a | David Gibson | daddr.sin_addr.s_addr = 0xffffffff;
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205 | b63c7f6b | aliguori | } |
206 | 512176db | bellard | } else {
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207 | 460fec67 | Jan Kiszka | bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr); |
208 | 512176db | bellard | if (!bc) {
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209 | d981b883 | bellard | /* if never assigned, behaves as if it was already
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210 | d981b883 | bellard | assigned (windows fix because it remembers its address) */
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211 | d981b883 | bellard | goto new_addr;
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212 | 512176db | bellard | } |
213 | f0cbd3ec | bellard | } |
214 | 47d5d01a | ths | |
215 | 1a0ca1e1 | Fabien Chouteau | /* Update ARP table for this IP address */
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216 | 1a0ca1e1 | Fabien Chouteau | arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr); |
217 | 1a0ca1e1 | Fabien Chouteau | |
218 | 460fec67 | Jan Kiszka | saddr.sin_addr = slirp->vhost_addr; |
219 | f0cbd3ec | bellard | saddr.sin_port = htons(BOOTP_SERVER); |
220 | f0cbd3ec | bellard | |
221 | f0cbd3ec | bellard | daddr.sin_port = htons(BOOTP_CLIENT); |
222 | f0cbd3ec | bellard | |
223 | f0cbd3ec | bellard | rbp->bp_op = BOOTP_REPLY; |
224 | f0cbd3ec | bellard | rbp->bp_xid = bp->bp_xid; |
225 | f0cbd3ec | bellard | rbp->bp_htype = 1;
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226 | f0cbd3ec | bellard | rbp->bp_hlen = 6;
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227 | 1a0ca1e1 | Fabien Chouteau | memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN); |
228 | f0cbd3ec | bellard | |
229 | e95c8d51 | bellard | rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
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230 | e95c8d51 | bellard | rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
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231 | f0cbd3ec | bellard | |
232 | f0cbd3ec | bellard | q = rbp->bp_vend; |
233 | f0cbd3ec | bellard | memcpy(q, rfc1533_cookie, 4);
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234 | f0cbd3ec | bellard | q += 4;
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235 | f0cbd3ec | bellard | |
236 | b63c7f6b | aliguori | if (bc) {
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237 | d0f2c4c6 | malc | DPRINTF("%s addr=%08x\n",
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238 | b63c7f6b | aliguori | (dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed", |
239 | b63c7f6b | aliguori | ntohl(daddr.sin_addr.s_addr)); |
240 | b63c7f6b | aliguori | |
241 | b63c7f6b | aliguori | if (dhcp_msg_type == DHCPDISCOVER) {
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242 | b63c7f6b | aliguori | *q++ = RFC2132_MSG_TYPE; |
243 | b63c7f6b | aliguori | *q++ = 1;
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244 | b63c7f6b | aliguori | *q++ = DHCPOFFER; |
245 | b63c7f6b | aliguori | } else /* DHCPREQUEST */ { |
246 | b63c7f6b | aliguori | *q++ = RFC2132_MSG_TYPE; |
247 | b63c7f6b | aliguori | *q++ = 1;
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248 | b63c7f6b | aliguori | *q++ = DHCPACK; |
249 | b63c7f6b | aliguori | } |
250 | b63c7f6b | aliguori | |
251 | 460fec67 | Jan Kiszka | if (slirp->bootp_filename)
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252 | b63c7f6b | aliguori | snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s", |
253 | 460fec67 | Jan Kiszka | slirp->bootp_filename); |
254 | 3b46e624 | ths | |
255 | f0cbd3ec | bellard | *q++ = RFC2132_SRV_ID; |
256 | f0cbd3ec | bellard | *q++ = 4;
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257 | f0cbd3ec | bellard | memcpy(q, &saddr.sin_addr, 4);
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258 | f0cbd3ec | bellard | q += 4;
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259 | f0cbd3ec | bellard | |
260 | f0cbd3ec | bellard | *q++ = RFC1533_NETMASK; |
261 | f0cbd3ec | bellard | *q++ = 4;
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262 | 460fec67 | Jan Kiszka | memcpy(q, &slirp->vnetwork_mask, 4);
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263 | a13a4126 | Jan Kiszka | q += 4;
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264 | 3b46e624 | ths | |
265 | 460fec67 | Jan Kiszka | if (!slirp->restricted) {
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266 | a9ba3a85 | aliguori | *q++ = RFC1533_GATEWAY; |
267 | a9ba3a85 | aliguori | *q++ = 4;
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268 | a9ba3a85 | aliguori | memcpy(q, &saddr.sin_addr, 4);
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269 | a9ba3a85 | aliguori | q += 4;
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270 | a9ba3a85 | aliguori | |
271 | a9ba3a85 | aliguori | *q++ = RFC1533_DNS; |
272 | a9ba3a85 | aliguori | *q++ = 4;
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273 | 460fec67 | Jan Kiszka | memcpy(q, &slirp->vnameserver_addr, 4);
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274 | a9ba3a85 | aliguori | q += 4;
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275 | a9ba3a85 | aliguori | } |
276 | f0cbd3ec | bellard | |
277 | f0cbd3ec | bellard | *q++ = RFC2132_LEASE_TIME; |
278 | f0cbd3ec | bellard | *q++ = 4;
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279 | f0cbd3ec | bellard | val = htonl(LEASE_TIME); |
280 | f0cbd3ec | bellard | memcpy(q, &val, 4);
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281 | f0cbd3ec | bellard | q += 4;
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282 | 115defd1 | pbrook | |
283 | 460fec67 | Jan Kiszka | if (*slirp->client_hostname) {
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284 | 460fec67 | Jan Kiszka | val = strlen(slirp->client_hostname); |
285 | 115defd1 | pbrook | *q++ = RFC1533_HOSTNAME; |
286 | 115defd1 | pbrook | *q++ = val; |
287 | 460fec67 | Jan Kiszka | memcpy(q, slirp->client_hostname, val); |
288 | 115defd1 | pbrook | q += val; |
289 | 115defd1 | pbrook | } |
290 | b63c7f6b | aliguori | } else {
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291 | b63c7f6b | aliguori | static const char nak_msg[] = "requested address not available"; |
292 | b63c7f6b | aliguori | |
293 | 24ac3a7d | Vincent Palatin | DPRINTF("nak'ed addr=%08x\n", ntohl(preq_addr.s_addr));
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294 | b63c7f6b | aliguori | |
295 | b63c7f6b | aliguori | *q++ = RFC2132_MSG_TYPE; |
296 | b63c7f6b | aliguori | *q++ = 1;
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297 | b63c7f6b | aliguori | *q++ = DHCPNAK; |
298 | b63c7f6b | aliguori | |
299 | b63c7f6b | aliguori | *q++ = RFC2132_MESSAGE; |
300 | b63c7f6b | aliguori | *q++ = sizeof(nak_msg) - 1; |
301 | b63c7f6b | aliguori | memcpy(q, nak_msg, sizeof(nak_msg) - 1); |
302 | b63c7f6b | aliguori | q += sizeof(nak_msg) - 1; |
303 | f0cbd3ec | bellard | } |
304 | 369c86e7 | Blue Swirl | *q = RFC1533_END; |
305 | 3b46e624 | ths | |
306 | b63c7f6b | aliguori | daddr.sin_addr.s_addr = 0xffffffffu;
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307 | b63c7f6b | aliguori | |
308 | 5fafdf24 | ths | m->m_len = sizeof(struct bootp_t) - |
309 | 44bbf73f | bellard | sizeof(struct ip) - sizeof(struct udphdr); |
310 | f0cbd3ec | bellard | udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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311 | f0cbd3ec | bellard | } |
312 | f0cbd3ec | bellard | |
313 | f0cbd3ec | bellard | void bootp_input(struct mbuf *m) |
314 | f0cbd3ec | bellard | { |
315 | 101c5935 | bellard | struct bootp_t *bp = mtod(m, struct bootp_t *); |
316 | f0cbd3ec | bellard | |
317 | f0cbd3ec | bellard | if (bp->bp_op == BOOTP_REQUEST) {
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318 | 460fec67 | Jan Kiszka | bootp_reply(m->slirp, bp); |
319 | f0cbd3ec | bellard | } |
320 | f0cbd3ec | bellard | } |