diff options
Diffstat (limited to 'slirp/src/bootp.c')
| -rw-r--r-- | slirp/src/bootp.c | 371 |
1 files changed, 0 insertions, 371 deletions
diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c deleted file mode 100644 index b208e3b216..0000000000 --- a/slirp/src/bootp.c +++ /dev/null @@ -1,371 +0,0 @@ -/* SPDX-License-Identifier: MIT */ -/* - * 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); - } -} |