/*
* 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
uint8_t macaddr[6];
} BOOTPClient;
-BOOTPClient bootp_clients[NB_ADDR];
+static BOOTPClient bootp_clients[NB_ADDR];
+
+const char *bootp_filename;
static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
#ifdef DEBUG
-#define dprintf(fmt, args...) \
-if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## args); fflush(dfd); }
+#define dprintf(fmt, ...) \
+if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## __VA_ARGS__); fflush(dfd); }
#else
-#define dprintf(fmt, args...)
+#define dprintf(fmt, ...)
#endif
-static BOOTPClient *get_new_addr(struct in_addr *paddr)
+static BOOTPClient *get_new_addr(struct in_addr *paddr,
+ const uint8_t *macaddr)
{
BOOTPClient *bc;
int i;
for(i = 0; i < NB_ADDR; i++) {
- if (!bootp_clients[i].allocated)
+ bc = &bootp_clients[i];
+ if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6))
goto found;
}
return NULL;
return bc;
}
+static BOOTPClient *request_addr(const struct in_addr *paddr,
+ const uint8_t *macaddr)
+{
+ uint32_t req_addr = ntohl(paddr->s_addr);
+ uint32_t spec_addr = ntohl(special_addr.s_addr);
+ BOOTPClient *bc;
+
+ if (req_addr >= (spec_addr | START_ADDR) &&
+ req_addr < (spec_addr | (NB_ADDR + START_ADDR))) {
+ bc = &bootp_clients[(req_addr & 0xff) - START_ADDR];
+ if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) {
+ bc->allocated = 1;
+ return bc;
+ }
+ }
+ return NULL;
+}
+
static BOOTPClient *find_addr(struct in_addr *paddr, const uint8_t *macaddr)
{
BOOTPClient *bc;
return bc;
}
-static void dhcp_decode(const uint8_t *buf, int size,
- int *pmsg_type)
+static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
+ const struct in_addr **preq_addr)
{
const uint8_t *p, *p_end;
int len, tag;
- *pmsg_type = 0;
+ *pmsg_type = 0;
+ *preq_addr = NULL;
- p = buf;
- p_end = buf + size;
- if (size < 5)
- return;
+ 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++;
+ p++;
} else if (tag == RFC1533_END) {
break;
} else {
if (p >= p_end)
break;
len = *p++;
- dprintf("dhcp: tag=0x%02x len=%d\n", tag, len);
+ 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)
+ *preq_addr = (struct in_addr *)p;
+ break;
default:
break;
}
p += len;
}
}
+ if (*pmsg_type == DHCPREQUEST && !*preq_addr && bp->bp_ciaddr.s_addr) {
+ *preq_addr = &bp->bp_ciaddr;
+ }
}
-static void bootp_reply(struct bootp_t *bp)
+static void bootp_reply(const struct bootp_t *bp)
{
- BOOTPClient *bc;
+ BOOTPClient *bc = NULL;
struct mbuf *m;
struct bootp_t *rbp;
struct sockaddr_in saddr, daddr;
struct in_addr dns_addr;
+ const struct in_addr *preq_addr;
int dhcp_msg_type, val;
uint8_t *q;
/* extract exact DHCP msg type */
- dhcp_decode(bp->bp_vend, DHCP_OPT_LEN, &dhcp_msg_type);
- dprintf("bootp packet op=%d msgtype=%d\n", bp->bp_op, dhcp_msg_type);
-
- if (dhcp_msg_type != DHCPDISCOVER &&
+ dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
+ dprintf("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
+ if (preq_addr)
+ dprintf(" req_addr=%08x\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;
/* XXX: this is a hack to get the client mac address */
memcpy(client_ethaddr, bp->bp_hwaddr, 6);
-
+
if ((m = m_get()) == NULL)
return;
- m->m_data += if_maxlinkhdr;
+ 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) {
- bc = get_new_addr(&daddr.sin_addr);
+ if (preq_addr) {
+ bc = request_addr(preq_addr, client_ethaddr);
+ if (bc) {
+ daddr.sin_addr = *preq_addr;
+ }
+ }
if (!bc) {
- dprintf("no address left\n");
- return;
+ new_addr:
+ bc = get_new_addr(&daddr.sin_addr, client_ethaddr);
+ if (!bc) {
+ dprintf("no address left\n");
+ return;
+ }
}
memcpy(bc->macaddr, client_ethaddr, 6);
+ } else if (preq_addr) {
+ bc = request_addr(preq_addr, client_ethaddr);
+ if (bc) {
+ daddr.sin_addr = *preq_addr;
+ memcpy(bc->macaddr, client_ethaddr, 6);
+ } else {
+ daddr.sin_addr.s_addr = 0;
+ }
} else {
bc = find_addr(&daddr.sin_addr, bp->bp_hwaddr);
if (!bc) {
- dprintf("no address assigned\n");
- return;
+ /* if never assigned, behaves as if it was already
+ assigned (windows fix because it remembers its address) */
+ goto new_addr;
}
}
- dprintf("offered addr=%08x\n", ntohl(daddr.sin_addr.s_addr));
saddr.sin_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
saddr.sin_port = htons(BOOTP_SERVER);
rbp->bp_hlen = 6;
memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, 6);
- rbp->bp_yiaddr = daddr.sin_addr; /* IP address */
+ rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
+ rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
q = rbp->bp_vend;
memcpy(q, rfc1533_cookie, 4);
q += 4;
- if (dhcp_msg_type == DHCPDISCOVER) {
- *q++ = RFC2132_MSG_TYPE;
- *q++ = 1;
- *q++ = DHCPOFFER;
- } else if (dhcp_msg_type == DHCPREQUEST) {
- *q++ = RFC2132_MSG_TYPE;
- *q++ = 1;
- *q++ = DHCPACK;
- }
-
- if (dhcp_msg_type == DHCPDISCOVER ||
- dhcp_msg_type == DHCPREQUEST) {
+ if (bc) {
+ dprintf("%s addr=%08x\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 (bootp_filename)
+ snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
+ bootp_filename);
+
*q++ = RFC2132_SRV_ID;
*q++ = 4;
memcpy(q, &saddr.sin_addr, 4);
*q++ = 0xff;
*q++ = 0xff;
*q++ = 0x00;
-
- *q++ = RFC1533_GATEWAY;
- *q++ = 4;
- memcpy(q, &saddr.sin_addr, 4);
- q += 4;
-
- *q++ = RFC1533_DNS;
- *q++ = 4;
- dns_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_DNS);
- memcpy(q, &dns_addr, 4);
- q += 4;
+
+ if (!slirp_restrict) {
+ *q++ = RFC1533_GATEWAY;
+ *q++ = 4;
+ memcpy(q, &saddr.sin_addr, 4);
+ q += 4;
+
+ *q++ = RFC1533_DNS;
+ *q++ = 4;
+ dns_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_DNS);
+ memcpy(q, &dns_addr, 4);
+ q += 4;
+ }
*q++ = RFC2132_LEASE_TIME;
*q++ = 4;
val = htonl(LEASE_TIME);
memcpy(q, &val, 4);
q += 4;
+
+ if (*slirp_hostname) {
+ val = strlen(slirp_hostname);
+ *q++ = RFC1533_HOSTNAME;
+ *q++ = val;
+ memcpy(q, slirp_hostname, val);
+ q += val;
+ }
+ } else {
+ static const char nak_msg[] = "requested address not available";
+
+ dprintf("nak'ed addr=%08x\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;
}
*q++ = RFC1533_END;
-
- m->m_len = sizeof(struct bootp_t) -
+
+ daddr.sin_addr.s_addr = 0xffffffffu;
+
+ m->m_len = sizeof(struct bootp_t) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
}
void bootp_input(struct mbuf *m)
{
- struct bootp_t *bp = (struct bootp_t *)m->m_data;
+ struct bootp_t *bp = mtod(m, struct bootp_t *);
if (bp->bp_op == BOOTP_REQUEST) {
bootp_reply(bp);
projects / qemu / blobdiff