Revision b63c7f6b slirp/bootp.c
| b/slirp/bootp.c | ||
|---|---|---|
| 66 | 66 |
return bc; |
| 67 | 67 |
} |
| 68 | 68 |
|
| 69 |
static BOOTPClient *request_addr(const struct in_addr *paddr, |
|
| 70 |
const uint8_t *macaddr) |
|
| 71 |
{
|
|
| 72 |
uint32_t req_addr = ntohl(paddr->s_addr); |
|
| 73 |
uint32_t spec_addr = ntohl(special_addr.s_addr); |
|
| 74 |
BOOTPClient *bc; |
|
| 75 |
|
|
| 76 |
if (req_addr >= (spec_addr | START_ADDR) && |
|
| 77 |
req_addr < (spec_addr | (NB_ADDR + START_ADDR))) {
|
|
| 78 |
bc = &bootp_clients[(req_addr & 0xff) - START_ADDR]; |
|
| 79 |
if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) {
|
|
| 80 |
bc->allocated = 1; |
|
| 81 |
return bc; |
|
| 82 |
} |
|
| 83 |
} |
|
| 84 |
return NULL; |
|
| 85 |
} |
|
| 86 |
|
|
| 69 | 87 |
static BOOTPClient *find_addr(struct in_addr *paddr, const uint8_t *macaddr) |
| 70 | 88 |
{
|
| 71 | 89 |
BOOTPClient *bc; |
| ... | ... | |
| 83 | 101 |
return bc; |
| 84 | 102 |
} |
| 85 | 103 |
|
| 86 |
static void dhcp_decode(const uint8_t *buf, int size,
|
|
| 87 |
int *pmsg_type)
|
|
| 104 |
static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
|
|
| 105 |
const struct in_addr **preq_addr)
|
|
| 88 | 106 |
{
|
| 89 | 107 |
const uint8_t *p, *p_end; |
| 90 | 108 |
int len, tag; |
| 91 | 109 |
|
| 92 | 110 |
*pmsg_type = 0; |
| 111 |
*preq_addr = NULL; |
|
| 93 | 112 |
|
| 94 |
p = buf; |
|
| 95 |
p_end = buf + size; |
|
| 96 |
if (size < 5) |
|
| 97 |
return; |
|
| 113 |
p = bp->bp_vend; |
|
| 114 |
p_end = p + DHCP_OPT_LEN; |
|
| 98 | 115 |
if (memcmp(p, rfc1533_cookie, 4) != 0) |
| 99 | 116 |
return; |
| 100 | 117 |
p += 4; |
| ... | ... | |
| 109 | 126 |
if (p >= p_end) |
| 110 | 127 |
break; |
| 111 | 128 |
len = *p++; |
| 112 |
dprintf("dhcp: tag=0x%02x len=%d\n", tag, len);
|
|
| 129 |
dprintf("dhcp: tag=%d len=%d\n", tag, len);
|
|
| 113 | 130 |
|
| 114 | 131 |
switch(tag) {
|
| 115 | 132 |
case RFC2132_MSG_TYPE: |
| 116 | 133 |
if (len >= 1) |
| 117 | 134 |
*pmsg_type = p[0]; |
| 118 | 135 |
break; |
| 136 |
case RFC2132_REQ_ADDR: |
|
| 137 |
if (len >= 4) |
|
| 138 |
*preq_addr = (struct in_addr *)p; |
|
| 139 |
break; |
|
| 119 | 140 |
default: |
| 120 | 141 |
break; |
| 121 | 142 |
} |
| 122 | 143 |
p += len; |
| 123 | 144 |
} |
| 124 | 145 |
} |
| 146 |
if (*pmsg_type == DHCPREQUEST && !*preq_addr && bp->bp_ciaddr.s_addr) {
|
|
| 147 |
*preq_addr = &bp->bp_ciaddr; |
|
| 148 |
} |
|
| 125 | 149 |
} |
| 126 | 150 |
|
| 127 |
static void bootp_reply(struct bootp_t *bp) |
|
| 151 |
static void bootp_reply(const struct bootp_t *bp)
|
|
| 128 | 152 |
{
|
| 129 |
BOOTPClient *bc; |
|
| 153 |
BOOTPClient *bc = NULL;
|
|
| 130 | 154 |
struct mbuf *m; |
| 131 | 155 |
struct bootp_t *rbp; |
| 132 | 156 |
struct sockaddr_in saddr, daddr; |
| 133 | 157 |
struct in_addr dns_addr; |
| 158 |
const struct in_addr *preq_addr; |
|
| 134 | 159 |
int dhcp_msg_type, val; |
| 135 | 160 |
uint8_t *q; |
| 136 | 161 |
|
| 137 | 162 |
/* extract exact DHCP msg type */ |
| 138 |
dhcp_decode(bp->bp_vend, DHCP_OPT_LEN, &dhcp_msg_type); |
|
| 139 |
dprintf("bootp packet op=%d msgtype=%d\n", bp->bp_op, dhcp_msg_type);
|
|
| 163 |
dhcp_decode(bp, &dhcp_msg_type, &preq_addr); |
|
| 164 |
dprintf("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
|
|
| 165 |
if (preq_addr) |
|
| 166 |
dprintf(" req_addr=%08x\n", ntohl(preq_addr->s_addr));
|
|
| 167 |
else |
|
| 168 |
dprintf("\n");
|
|
| 140 | 169 |
|
| 141 | 170 |
if (dhcp_msg_type == 0) |
| 142 | 171 |
dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */ |
| ... | ... | |
| 155 | 184 |
memset(rbp, 0, sizeof(struct bootp_t)); |
| 156 | 185 |
|
| 157 | 186 |
if (dhcp_msg_type == DHCPDISCOVER) {
|
| 158 |
new_addr: |
|
| 159 |
bc = get_new_addr(&daddr.sin_addr); |
|
| 187 |
if (preq_addr) {
|
|
| 188 |
bc = request_addr(preq_addr, client_ethaddr); |
|
| 189 |
if (bc) {
|
|
| 190 |
daddr.sin_addr = *preq_addr; |
|
| 191 |
} |
|
| 192 |
} |
|
| 160 | 193 |
if (!bc) {
|
| 161 |
dprintf("no address left\n");
|
|
| 162 |
return; |
|
| 194 |
new_addr: |
|
| 195 |
bc = get_new_addr(&daddr.sin_addr); |
|
| 196 |
if (!bc) {
|
|
| 197 |
dprintf("no address left\n");
|
|
| 198 |
return; |
|
| 199 |
} |
|
| 163 | 200 |
} |
| 164 | 201 |
memcpy(bc->macaddr, client_ethaddr, 6); |
| 202 |
} else if (preq_addr) {
|
|
| 203 |
bc = request_addr(preq_addr, client_ethaddr); |
|
| 204 |
if (bc) {
|
|
| 205 |
daddr.sin_addr = *preq_addr; |
|
| 206 |
memcpy(bc->macaddr, client_ethaddr, 6); |
|
| 207 |
} else {
|
|
| 208 |
daddr.sin_addr.s_addr = 0; |
|
| 209 |
} |
|
| 165 | 210 |
} else {
|
| 166 | 211 |
bc = find_addr(&daddr.sin_addr, bp->bp_hwaddr); |
| 167 | 212 |
if (!bc) {
|
| ... | ... | |
| 171 | 216 |
} |
| 172 | 217 |
} |
| 173 | 218 |
|
| 174 |
if (bootp_filename) |
|
| 175 |
snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s", |
|
| 176 |
bootp_filename); |
|
| 177 |
|
|
| 178 |
dprintf("offered addr=%08x\n", ntohl(daddr.sin_addr.s_addr));
|
|
| 179 |
|
|
| 180 | 219 |
saddr.sin_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS); |
| 181 | 220 |
saddr.sin_port = htons(BOOTP_SERVER); |
| 182 | 221 |
|
| ... | ... | |
| 191 | 230 |
rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */ |
| 192 | 231 |
rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */ |
| 193 | 232 |
|
| 194 |
daddr.sin_addr.s_addr = 0xffffffffu; |
|
| 195 |
|
|
| 196 | 233 |
q = rbp->bp_vend; |
| 197 | 234 |
memcpy(q, rfc1533_cookie, 4); |
| 198 | 235 |
q += 4; |
| 199 | 236 |
|
| 200 |
if (dhcp_msg_type == DHCPDISCOVER) {
|
|
| 201 |
*q++ = RFC2132_MSG_TYPE; |
|
| 202 |
*q++ = 1; |
|
| 203 |
*q++ = DHCPOFFER; |
|
| 204 |
} else if (dhcp_msg_type == DHCPREQUEST) {
|
|
| 205 |
*q++ = RFC2132_MSG_TYPE; |
|
| 206 |
*q++ = 1; |
|
| 207 |
*q++ = DHCPACK; |
|
| 208 |
} |
|
| 237 |
if (bc) {
|
|
| 238 |
dprintf("%s addr=%08x\n",
|
|
| 239 |
(dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed", |
|
| 240 |
ntohl(daddr.sin_addr.s_addr)); |
|
| 241 |
|
|
| 242 |
if (dhcp_msg_type == DHCPDISCOVER) {
|
|
| 243 |
*q++ = RFC2132_MSG_TYPE; |
|
| 244 |
*q++ = 1; |
|
| 245 |
*q++ = DHCPOFFER; |
|
| 246 |
} else /* DHCPREQUEST */ {
|
|
| 247 |
*q++ = RFC2132_MSG_TYPE; |
|
| 248 |
*q++ = 1; |
|
| 249 |
*q++ = DHCPACK; |
|
| 250 |
} |
|
| 251 |
|
|
| 252 |
if (bootp_filename) |
|
| 253 |
snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s", |
|
| 254 |
bootp_filename); |
|
| 209 | 255 |
|
| 210 |
if (dhcp_msg_type == DHCPDISCOVER || |
|
| 211 |
dhcp_msg_type == DHCPREQUEST) {
|
|
| 212 | 256 |
*q++ = RFC2132_SRV_ID; |
| 213 | 257 |
*q++ = 4; |
| 214 | 258 |
memcpy(q, &saddr.sin_addr, 4); |
| ... | ... | |
| 247 | 291 |
memcpy(q, slirp_hostname, val); |
| 248 | 292 |
q += val; |
| 249 | 293 |
} |
| 294 |
} else {
|
|
| 295 |
static const char nak_msg[] = "requested address not available"; |
|
| 296 |
|
|
| 297 |
dprintf("nak'ed addr=%08x\n", ntohl(preq_addr->s_addr));
|
|
| 298 |
|
|
| 299 |
*q++ = RFC2132_MSG_TYPE; |
|
| 300 |
*q++ = 1; |
|
| 301 |
*q++ = DHCPNAK; |
|
| 302 |
|
|
| 303 |
*q++ = RFC2132_MESSAGE; |
|
| 304 |
*q++ = sizeof(nak_msg) - 1; |
|
| 305 |
memcpy(q, nak_msg, sizeof(nak_msg) - 1); |
|
| 306 |
q += sizeof(nak_msg) - 1; |
|
| 250 | 307 |
} |
| 251 | 308 |
*q++ = RFC1533_END; |
| 252 | 309 |
|
| 310 |
daddr.sin_addr.s_addr = 0xffffffffu; |
|
| 311 |
|
|
| 253 | 312 |
m->m_len = sizeof(struct bootp_t) - |
| 254 | 313 |
sizeof(struct ip) - sizeof(struct udphdr); |
| 255 | 314 |
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY); |
Also available in: Unified diff