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-rwxr-xr-xsrc/rfc2131.c2332
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diff --git a/src/rfc2131.c b/src/rfc2131.c
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+++ b/src/rfc2131.c
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+/* dnsmasq is Copyright (c) 2000-2009 Simon Kelley
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 dated June, 1991, or
+ (at your option) version 3 dated 29 June, 2007.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "dnsmasq.h"
+
+#ifdef HAVE_DHCP
+
+#define BOOTREQUEST 1
+#define BOOTREPLY 2
+#define DHCP_COOKIE 0x63825363
+
+/* The Linux in-kernel DHCP client silently ignores any packet
+ smaller than this. Sigh........... */
+#define MIN_PACKETSZ 300
+
+#define OPTION_PAD 0
+#define OPTION_NETMASK 1
+#define OPTION_ROUTER 3
+#define OPTION_DNSSERVER 6
+#define OPTION_HOSTNAME 12
+#define OPTION_DOMAINNAME 15
+#define OPTION_BROADCAST 28
+#define OPTION_VENDOR_CLASS_OPT 43
+#define OPTION_REQUESTED_IP 50
+#define OPTION_LEASE_TIME 51
+#define OPTION_OVERLOAD 52
+#define OPTION_MESSAGE_TYPE 53
+#define OPTION_SERVER_IDENTIFIER 54
+#define OPTION_REQUESTED_OPTIONS 55
+#define OPTION_MESSAGE 56
+#define OPTION_MAXMESSAGE 57
+#define OPTION_T1 58
+#define OPTION_T2 59
+#define OPTION_VENDOR_ID 60
+#define OPTION_CLIENT_ID 61
+#define OPTION_SNAME 66
+#define OPTION_FILENAME 67
+#define OPTION_USER_CLASS 77
+#define OPTION_CLIENT_FQDN 81
+#define OPTION_AGENT_ID 82
+#define OPTION_ARCH 93
+#define OPTION_PXE_UUID 97
+#define OPTION_SUBNET_SELECT 118
+#define OPTION_END 255
+
+#define SUBOPT_CIRCUIT_ID 1
+#define SUBOPT_REMOTE_ID 2
+#define SUBOPT_SUBNET_SELECT 5 /* RFC 3527 */
+#define SUBOPT_SUBSCR_ID 6 /* RFC 3393 */
+#define SUBOPT_SERVER_OR 11 /* RFC 5107 */
+
+#define SUBOPT_PXE_BOOT_ITEM 71 /* PXE standard */
+#define SUBOPT_PXE_DISCOVERY 6
+#define SUBOPT_PXE_SERVERS 8
+#define SUBOPT_PXE_MENU 9
+#define SUBOPT_PXE_MENU_PROMPT 10
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+#define DHCPINFORM 8
+
+#define have_config(config, mask) ((config) && ((config)->flags & (mask)))
+#define option_len(opt) ((int)(((unsigned char *)(opt))[1]))
+#define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)]))
+
+static int sanitise(unsigned char *opt, char *buf);
+static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback);
+static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt);
+static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val);
+static void option_put_string(struct dhcp_packet *mess, unsigned char *end,
+ int opt, char *string, int null_term);
+static struct in_addr option_addr(unsigned char *opt);
+static struct in_addr option_addr_arr(unsigned char *opt, int offset);
+static unsigned int option_uint(unsigned char *opt, int i, int size);
+static void log_packet(char *type, void *addr, unsigned char *ext_mac,
+ int mac_len, char *interface, char *string, u32 xid);
+static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize);
+static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize);
+static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid,
+ unsigned char *agent_id, unsigned char *real_end);
+static void clear_packet(struct dhcp_packet *mess, unsigned char *end);
+static void do_options(struct dhcp_context *context,
+ struct dhcp_packet *mess,
+ unsigned char *real_end,
+ unsigned char *req_options,
+ char *hostname,
+ char *domain, char *config_domain,
+ struct dhcp_netid *netid,
+ struct in_addr subnet_addr,
+ unsigned char fqdn_flags,
+ int null_term, int pxearch,
+ unsigned char *uuid);
+
+
+static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt);
+static void do_encap_opts(struct dhcp_opt *opts, int encap, int flag, struct dhcp_packet *mess, unsigned char *end, int null_term);
+static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid);
+static int prune_vendor_opts(struct dhcp_netid *netid);
+static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid);
+struct dhcp_boot *find_boot(struct dhcp_netid *netid);
+
+
+size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
+ size_t sz, time_t now, int unicast_dest, int *is_inform)
+{
+ unsigned char *opt, *clid = NULL;
+ struct dhcp_lease *ltmp, *lease = NULL;
+ struct dhcp_vendor *vendor;
+ struct dhcp_mac *mac;
+ struct dhcp_netid_list *id_list;
+ int clid_len = 0, ignore = 0, do_classes = 0, selecting = 0, pxearch = -1;
+ struct dhcp_packet *mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base;
+ unsigned char *end = (unsigned char *)(mess + 1);
+ unsigned char *real_end = (unsigned char *)(mess + 1);
+ char *hostname = NULL, *offer_hostname = NULL, *client_hostname = NULL, *domain = NULL;
+ int hostname_auth = 0, borken_opt = 0;
+ unsigned char *req_options = NULL;
+ char *message = NULL;
+ unsigned int time;
+ struct dhcp_config *config;
+ struct dhcp_netid *netid;
+ struct in_addr subnet_addr, fallback, override;
+ unsigned short fuzz = 0;
+ unsigned int mess_type = 0;
+ unsigned char fqdn_flags = 0;
+ unsigned char *agent_id = NULL, *uuid = NULL;
+ unsigned char *emac = NULL;
+ int emac_len = 0;
+ struct dhcp_netid known_id, iface_id;
+ struct dhcp_opt *o;
+ unsigned char pxe_uuid[17];
+
+ subnet_addr.s_addr = override.s_addr = 0;
+
+ /* set tag with name == interface */
+ iface_id.net = iface_name;
+ iface_id.next = NULL;
+ netid = &iface_id;
+
+ if (mess->op != BOOTREQUEST || mess->hlen > DHCP_CHADDR_MAX)
+ return 0;
+
+ if (mess->htype == 0 && mess->hlen != 0)
+ return 0;
+
+ /* check for DHCP rather than BOOTP */
+ if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1)))
+ {
+ mess_type = option_uint(opt, 0, 1);
+
+ /* only insist on a cookie for DHCP. */
+ if (*((u32 *)&mess->options) != htonl(DHCP_COOKIE))
+ return 0;
+
+ /* two things to note here: expand_buf may move the packet,
+ so reassign mess from daemon->packet. Also, the size
+ sent includes the IP and UDP headers, hence the magic "-28" */
+ if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE, 2)))
+ {
+ size_t size = (size_t)option_uint(opt, 0, 2) - 28;
+
+ if (size > DHCP_PACKET_MAX)
+ size = DHCP_PACKET_MAX;
+ else if (size < sizeof(struct dhcp_packet))
+ size = sizeof(struct dhcp_packet);
+
+ if (expand_buf(&daemon->dhcp_packet, size))
+ {
+ mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base;
+ real_end = end = ((unsigned char *)mess) + size;
+ }
+ }
+
+ /* Some buggy clients set ciaddr when they shouldn't, so clear that here since
+ it can affect the context-determination code. */
+ if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER))
+ mess->ciaddr.s_addr = 0;
+
+ if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1)))
+ {
+ /* Any agent-id needs to be copied back out, verbatim, as the last option
+ in the packet. Here, we shift it to the very end of the buffer, if it doesn't
+ get overwritten, then it will be shuffled back at the end of processing.
+ Note that the incoming options must not be overwritten here, so there has to
+ be enough free space at the end of the packet to copy the option. */
+ unsigned char *sopt;
+ unsigned int total = option_len(opt) + 2;
+ unsigned char *last_opt = option_find(mess, sz, OPTION_END, 0);
+ if (last_opt && last_opt < end - total)
+ {
+ end -= total;
+ agent_id = end;
+ memcpy(agent_id, opt, total);
+ }
+
+ /* look for RFC3527 Link selection sub-option */
+ if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SUBNET_SELECT, INADDRSZ)))
+ subnet_addr = option_addr(sopt);
+
+ /* look for RFC5107 server-identifier-override */
+ if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ)))
+ override = option_addr(sopt);
+
+ /* if a circuit-id or remote-is option is provided, exact-match to options. */
+ for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
+ {
+ int search;
+
+ if (vendor->match_type == MATCH_CIRCUIT)
+ search = SUBOPT_CIRCUIT_ID;
+ else if (vendor->match_type == MATCH_REMOTE)
+ search = SUBOPT_REMOTE_ID;
+ else if (vendor->match_type == MATCH_SUBSCRIBER)
+ search = SUBOPT_SUBSCR_ID;
+ else
+ continue;
+
+ if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) &&
+ vendor->len == option_len(sopt) &&
+ memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0)
+ {
+ vendor->netid.next = netid;
+ netid = &vendor->netid;
+ break;
+ }
+ }
+ }
+
+ /* Check for RFC3011 subnet selector - only if RFC3527 one not present */
+ if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ)))
+ subnet_addr = option_addr(opt);
+
+ /* If there is no client identifier option, use the hardware address */
+ if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1)))
+ {
+ clid_len = option_len(opt);
+ clid = option_ptr(opt, 0);
+ }
+
+ /* do we have a lease in store? */
+ lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, clid, clid_len);
+
+ /* If this request is missing a clid, but we've seen one before,
+ use it again for option matching etc. */
+ if (lease && !clid && lease->clid)
+ {
+ clid_len = lease->clid_len;
+ clid = lease->clid;
+ }
+
+ /* find mac to use for logging and hashing */
+ emac = extended_hwaddr(mess->htype, mess->hlen, mess->chaddr, clid_len, clid, &emac_len);
+ }
+
+ for (mac = daemon->dhcp_macs; mac; mac = mac->next)
+ if (mac->hwaddr_len == mess->hlen &&
+ (mac->hwaddr_type == mess->htype || mac->hwaddr_type == 0) &&
+ memcmp_masked(mac->hwaddr, mess->chaddr, mess->hlen, mac->mask))
+ {
+ mac->netid.next = netid;
+ netid = &mac->netid;
+ }
+
+ /* Determine network for this packet. Our caller will have already linked all the
+ contexts which match the addresses of the receiving interface but if the
+ machine has an address already, or came via a relay, or we have a subnet selector,
+ we search again. If we don't have have a giaddr or explicit subnet selector,
+ use the ciaddr. This is necessary because a machine which got a lease via a
+ relay won't use the relay to renew. If matching a ciaddr fails but we have a context
+ from the physical network, continue using that to allow correct DHCPNAK generation later. */
+ if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr)
+ {
+ struct dhcp_context *context_tmp, *context_new = NULL;
+ struct in_addr addr;
+ int force = 0;
+
+ if (subnet_addr.s_addr)
+ {
+ addr = subnet_addr;
+ force = 1;
+ }
+ else if (mess->giaddr.s_addr)
+ {
+ addr = mess->giaddr;
+ force = 1;
+ }
+ else
+ {
+ /* If ciaddr is in the hardware derived set of contexts, leave that unchanged */
+ addr = mess->ciaddr;
+ for (context_tmp = context; context_tmp; context_tmp = context_tmp->current)
+ if (context_tmp->netmask.s_addr &&
+ is_same_net(addr, context_tmp->start, context_tmp->netmask) &&
+ is_same_net(addr, context_tmp->end, context_tmp->netmask))
+ {
+ context_new = context;
+ break;
+ }
+ }
+
+ if (!context_new)
+ for (context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next)
+ if (context_tmp->netmask.s_addr &&
+ is_same_net(addr, context_tmp->start, context_tmp->netmask) &&
+ is_same_net(addr, context_tmp->end, context_tmp->netmask))
+ {
+ context_tmp->current = context_new;
+ context_new = context_tmp;
+ }
+
+ if (context_new || force)
+ context = context_new;
+
+ }
+
+ if (!context)
+ {
+ my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"),
+ subnet_addr.s_addr ? _("with subnet selector") : _("via"),
+ subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name));
+ return 0;
+ }
+
+ /* keep _a_ local address available. */
+ fallback = context->local;
+
+ if (daemon->options & OPT_LOG_OPTS)
+ {
+ struct dhcp_context *context_tmp;
+ for (context_tmp = context; context_tmp; context_tmp = context_tmp->current)
+ {
+ strcpy(daemon->namebuff, inet_ntoa(context_tmp->start));
+ if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY))
+ my_syslog(MS_DHCP | LOG_INFO, _("%u Available DHCP subnet: %s/%s"),
+ ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->netmask));
+ else
+ my_syslog(MS_DHCP | LOG_INFO, _("%u Available DHCP range: %s -- %s"),
+ ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->end));
+ }
+ }
+
+ mess->op = BOOTREPLY;
+
+ config = find_config(daemon->dhcp_conf, context, clid, clid_len,
+ mess->chaddr, mess->hlen, mess->htype, NULL);
+
+ /* set "known" tag for known hosts */
+ if (config)
+ {
+ known_id.net = "known";
+ known_id.next = netid;
+ netid = &known_id;
+ }
+
+ if (mess_type == 0)
+ {
+ /* BOOTP request */
+ struct dhcp_netid id, bootp_id;
+ struct in_addr *logaddr = NULL;
+
+ /* must have a MAC addr for bootp */
+ if (mess->htype == 0 || mess->hlen == 0 || (context->flags & CONTEXT_PROXY))
+ return 0;
+
+ if (have_config(config, CONFIG_DISABLE))
+ message = _("disabled");
+
+ end = mess->options + 64; /* BOOTP vend area is only 64 bytes */
+
+ if (have_config(config, CONFIG_NAME))
+ {
+ hostname = config->hostname;
+ domain = config->domain;
+ }
+
+ if (have_config(config, CONFIG_NETID))
+ {
+ config->netid.next = netid;
+ netid = &config->netid;
+ }
+
+ /* Match incoming filename field as a netid. */
+ if (mess->file[0])
+ {
+ memcpy(daemon->dhcp_buff2, mess->file, sizeof(mess->file));
+ daemon->dhcp_buff2[sizeof(mess->file) + 1] = 0; /* ensure zero term. */
+ id.net = (char *)daemon->dhcp_buff2;
+ id.next = netid;
+ netid = &id;
+ }
+
+ /* Add "bootp" as a tag to allow different options, address ranges etc
+ for BOOTP clients */
+ bootp_id.net = "bootp";
+ bootp_id.next = netid;
+ netid = &bootp_id;
+
+ for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next)
+ if (match_netid(id_list->list, netid, 0))
+ message = _("ignored");
+
+ if (!message)
+ {
+ int nailed = 0;
+
+ if (have_config(config, CONFIG_ADDR))
+ {
+ nailed = 1;
+ logaddr = &config->addr;
+ mess->yiaddr = config->addr;
+ if ((lease = lease_find_by_addr(config->addr)) &&
+ (lease->hwaddr_len != mess->hlen ||
+ lease->hwaddr_type != mess->htype ||
+ memcmp(lease->hwaddr, mess->chaddr, lease->hwaddr_len) != 0))
+ message = _("address in use");
+ }
+ else
+ {
+ if (!(lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, NULL, 0)) ||
+ !address_available(context, lease->addr, netid))
+ {
+ if (lease)
+ {
+ /* lease exists, wrong network. */
+ lease_prune(lease, now);
+ lease = NULL;
+ }
+ if (!address_allocate(context, &mess->yiaddr, mess->chaddr, mess->hlen, netid, now))
+ message = _("no address available");
+ }
+ else
+ mess->yiaddr = lease->addr;
+ }
+
+ if (!message && !(context = narrow_context(context, mess->yiaddr, netid)))
+ message = _("wrong network");
+ else if (context->netid.net)
+ {
+ context->netid.next = netid;
+ netid = &context->netid;
+ }
+
+ if (!message && !nailed)
+ {
+ for (id_list = daemon->bootp_dynamic; id_list; id_list = id_list->next)
+ if ((!id_list->list) || match_netid(id_list->list, netid, 0))
+ break;
+ if (!id_list)
+ message = _("no address configured");
+ }
+
+ if (!message &&
+ !lease &&
+ (!(lease = lease_allocate(mess->yiaddr))))
+ message = _("no leases left");
+
+ if (!message)
+ {
+ logaddr = &mess->yiaddr;
+
+ lease_set_hwaddr(lease, mess->chaddr, NULL, mess->hlen, mess->htype, 0);
+ if (hostname)
+ lease_set_hostname(lease, hostname, 1);
+ /* infinite lease unless nailed in dhcp-host line. */
+ lease_set_expires(lease,
+ have_config(config, CONFIG_TIME) ? config->lease_time : 0xffffffff,
+ now);
+ lease_set_interface(lease, int_index);
+
+ clear_packet(mess, end);
+ do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr),
+ domain, netid, subnet_addr, 0, 0, 0, NULL);
+ }
+ }
+
+ log_packet("BOOTP", logaddr, mess->chaddr, mess->hlen, iface_name, message, mess->xid);
+
+ return message ? 0 : dhcp_packet_size(mess, netid, agent_id, real_end);
+ }
+
+ if ((opt = option_find(mess, sz, OPTION_CLIENT_FQDN, 4)))
+ {
+ /* http://tools.ietf.org/wg/dhc/draft-ietf-dhc-fqdn-option/draft-ietf-dhc-fqdn-option-10.txt */
+ int len = option_len(opt);
+ char *pq = daemon->dhcp_buff;
+ unsigned char *pp, *op = option_ptr(opt, 0);
+
+ fqdn_flags = *op;
+ len -= 3;
+ op += 3;
+ pp = op;
+
+ /* Always force update, since the client has no way to do it itself. */
+ if (!(fqdn_flags & 0x01))
+ fqdn_flags |= 0x02;
+
+ fqdn_flags &= ~0x08;
+ fqdn_flags |= 0x01;
+
+ if (fqdn_flags & 0x04)
+ while (*op != 0 && ((op + (*op) + 1) - pp) < len)
+ {
+ memcpy(pq, op+1, *op);
+ pq += *op;
+ op += (*op)+1;
+ *(pq++) = '.';
+ }
+ else
+ {
+ memcpy(pq, op, len);
+ if (len > 0 && op[len-1] == 0)
+ borken_opt = 1;
+ pq += len + 1;
+ }
+
+ if (pq != daemon->dhcp_buff)
+ pq--;
+
+ *pq = 0;
+
+ if (legal_hostname(daemon->dhcp_buff))
+ offer_hostname = client_hostname = daemon->dhcp_buff;
+ }
+ else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1)))
+ {
+ int len = option_len(opt);
+ memcpy(daemon->dhcp_buff, option_ptr(opt, 0), len);
+ /* Microsoft clients are broken, and need zero-terminated strings
+ in options. We detect this state here, and do the same in
+ any options we send */
+ if (len > 0 && daemon->dhcp_buff[len-1] == 0)
+ borken_opt = 1;
+ else
+ daemon->dhcp_buff[len] = 0;
+ if (legal_hostname(daemon->dhcp_buff))
+ client_hostname = daemon->dhcp_buff;
+ }
+
+ if (client_hostname && daemon->options & OPT_LOG_OPTS)
+ my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), ntohl(mess->xid), client_hostname);
+
+ if (have_config(config, CONFIG_NAME))
+ {
+ hostname = config->hostname;
+ domain = config->domain;
+ hostname_auth = 1;
+ /* be careful not to send an OFFER with a hostname not matching the DISCOVER. */
+ if (fqdn_flags != 0 || !client_hostname || hostname_isequal(hostname, client_hostname))
+ offer_hostname = hostname;
+ }
+ else if (client_hostname)
+ {
+ domain = strip_hostname(client_hostname);
+
+ if (strlen(client_hostname) != 0)
+ {
+ hostname = client_hostname;
+ if (!config)
+ {
+ /* Search again now we have a hostname.
+ Only accept configs without CLID and HWADDR here, (they won't match)
+ to avoid impersonation by name. */
+ struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0,
+ mess->chaddr, mess->hlen,
+ mess->htype, hostname);
+ if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr)
+ {
+ config = new;
+ /* set "known" tag for known hosts */
+ known_id.net = "known";
+ known_id.next = netid;
+ netid = &known_id;
+ }
+ }
+ }
+ }
+
+ if (have_config(config, CONFIG_NETID))
+ {
+ config->netid.next = netid;
+ netid = &config->netid;
+ }
+
+ /* dhcp-match. If we have hex-and-wildcards, look for a left-anchored match.
+ Otherwise assume the option is an array, and look for a matching element.
+ If no data given, existance of the option is enough. */
+ for (o = daemon->dhcp_match; o; o = o->next)
+ {
+ int i, matched = 0;
+
+ if (!(opt = option_find(mess, sz, o->opt, 1)) ||
+ o->len > option_len(opt))
+ continue;
+
+ if (o->len == 0)
+ matched = 1;
+ else if (o->flags & DHOPT_HEX)
+ {
+ if (memcmp_masked(o->val, option_ptr(opt, 0), o->len, o->u.wildcard_mask))
+ matched = 1;
+ }
+ else
+ for (i = 0; i <= (option_len(opt) - o->len); )
+ {
+ if (memcmp(o->val, option_ptr(opt, i), o->len) == 0)
+ {
+ matched = 1;
+ break;
+ }
+
+ if (o->flags & DHOPT_STRING)
+ i++;
+ else
+ i += o->len;
+ }
+
+ if (matched)
+ {
+ o->netid->next = netid;
+ netid = o->netid;
+ }
+ }
+
+ /* user-class options are, according to RFC3004, supposed to contain
+ a set of counted strings. Here we check that this is so (by seeing
+ if the counts are consistent with the overall option length) and if
+ so zero the counts so that we don't get spurious matches between
+ the vendor string and the counts. If the lengths don't add up, we
+ assume that the option is a single string and non RFC3004 compliant
+ and just do the substring match. dhclient provides these broken options.
+ The code, later, which sends user-class data to the lease-change script
+ relies on the transformation done here.
+ */
+
+ if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1)))
+ {
+ unsigned char *ucp = option_ptr(opt, 0);
+ int tmp, j;
+ for (j = 0; j < option_len(opt); j += ucp[j] + 1);
+ if (j == option_len(opt))
+ for (j = 0; j < option_len(opt); j = tmp)
+ {
+ tmp = j + ucp[j] + 1;
+ ucp[j] = 0;
+ }
+ }
+
+ for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
+ {
+ int mopt;
+
+ if (vendor->match_type == MATCH_VENDOR)
+ mopt = OPTION_VENDOR_ID;
+ else if (vendor->match_type == MATCH_USER)
+ mopt = OPTION_USER_CLASS;
+ else
+ continue;
+
+ if ((opt = option_find(mess, sz, mopt, 1)))
+ {
+ int i;
+ for (i = 0; i <= (option_len(opt) - vendor->len); i++)
+ if (memcmp(vendor->data, option_ptr(opt, i), vendor->len) == 0)
+ {
+ vendor->netid.next = netid;
+ netid = &vendor->netid;
+ break;
+ }
+ }
+ }
+
+ /* mark vendor-encapsulated options which match the client-supplied vendor class */
+ match_vendor_opts(option_find(mess, sz, OPTION_VENDOR_ID, 1), daemon->dhcp_opts);
+
+ if (daemon->options & OPT_LOG_OPTS)
+ {
+ if (sanitise(option_find(mess, sz, OPTION_VENDOR_ID, 1), daemon->namebuff))
+ my_syslog(MS_DHCP | LOG_INFO, _("%u Vendor class: %s"), ntohl(mess->xid), daemon->namebuff);
+ if (sanitise(option_find(mess, sz, OPTION_USER_CLASS, 1), daemon->namebuff))
+ my_syslog(MS_DHCP | LOG_INFO, _("%u User class: %s"), ntohl(mess->xid), daemon->namebuff);
+ }
+
+ /* if all the netids in the ignore list are present, ignore this client */
+ for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next)
+ if (match_netid(id_list->list, netid, 0))
+ ignore = 1;
+
+ /* Can have setting to ignore the client ID for a particular MAC address or hostname */
+ if (have_config(config, CONFIG_NOCLID))
+ clid = NULL;
+
+ /* Check if client is PXE client. */
+ if (daemon->enable_pxe &&
+ (opt = option_find(mess, sz, OPTION_VENDOR_ID, 9)) &&
+ strncmp(option_ptr(opt, 0), "PXEClient", 9) == 0)
+ {
+ if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17)))
+ {
+ memcpy(pxe_uuid, option_ptr(opt, 0), 17);
+ uuid = pxe_uuid;
+ }
+
+ /* Check if this is really a PXE bootserver request, and handle specially if so. */
+ if ((mess_type == DHCPREQUEST || mess_type == DHCPINFORM) &&
+ (opt = option_find(mess, sz, OPTION_VENDOR_CLASS_OPT, 1)) &&
+ (opt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_PXE_BOOT_ITEM, 4)))
+ {
+ struct pxe_service *service;
+ int type = option_uint(opt, 0, 2);
+ int layer = option_uint(opt, 2, 2);
+ unsigned char save71[4];
+ struct dhcp_opt opt71;
+
+ if (ignore)
+ return 0;
+
+ if (layer & 0x8000)
+ {
+ my_syslog(MS_DHCP | LOG_ERR, _("PXE BIS not supported"));
+ return 0;
+ }
+
+ memcpy(save71, option_ptr(opt, 0), 4);
+
+ for (service = daemon->pxe_services; service; service = service->next)
+ if (service->type == type)
+ break;
+
+ if (!service || !service->basename)
+ return 0;
+
+ clear_packet(mess, end);
+
+ mess->yiaddr = mess->ciaddr;
+ mess->ciaddr.s_addr = 0;
+ if (service->server.s_addr != 0)
+ mess->siaddr = service->server;
+ else
+ mess->siaddr = context->local;
+
+ snprintf((char *)mess->file, sizeof(mess->file), "%s.%d", service->basename, layer);
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr));
+ pxe_misc(mess, end, uuid);
+
+ prune_vendor_opts(netid);
+ opt71.val = save71;
+ opt71.opt = SUBOPT_PXE_BOOT_ITEM;
+ opt71.len = 4;
+ opt71.flags = DHOPT_VENDOR_MATCH;
+ opt71.netid = NULL;
+ opt71.next = daemon->dhcp_opts;
+ do_encap_opts(&opt71, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0);
+
+ log_packet("PXE", &mess->yiaddr, emac, emac_len, iface_name, (char *)mess->file, mess->xid);
+ return dhcp_packet_size(mess, netid, agent_id, real_end);
+ }
+
+ if ((opt = option_find(mess, sz, OPTION_ARCH, 2)))
+ {
+ pxearch = option_uint(opt, 0, 2);
+
+ /* proxy DHCP here. The DHCPREQUEST stuff is for gPXE */
+ if ((mess_type == DHCPDISCOVER || mess_type == DHCPREQUEST) &&
+ (context->flags & CONTEXT_PROXY))
+ {
+ struct dhcp_boot *boot = find_boot(netid);
+
+ mess->yiaddr.s_addr = 0;
+ if (mess_type == DHCPDISCOVER || mess->ciaddr.s_addr == 0)
+ {
+ mess->ciaddr.s_addr = 0;
+ mess->flags |= htons(0x8000); /* broadcast */
+ }
+
+ clear_packet(mess, end);
+
+ /* Provide the bootfile here, for gPXE, and in case we have no menu items
+ and set discovery_control = 8 */
+ if (boot)
+ {
+ if (boot->next_server.s_addr)
+ mess->siaddr = boot->next_server;
+
+ if (boot->file)
+ strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1);
+ }
+
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1,
+ mess_type == DHCPDISCOVER ? DHCPOFFER : DHCPACK);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr));
+ pxe_misc(mess, end, uuid);
+ prune_vendor_opts(netid);
+ do_encap_opts(pxe_opts(pxearch, netid), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0);
+
+ log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy" : "proxy-ignored", mess->xid);
+ return ignore ? 0 : dhcp_packet_size(mess, netid, agent_id, real_end);
+ }
+ }
+ }
+
+ /* if we're just a proxy server, go no further */
+ if (context->flags & CONTEXT_PROXY)
+ return 0;
+
+ if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0)))
+ {
+ req_options = (unsigned char *)daemon->dhcp_buff2;
+ memcpy(req_options, option_ptr(opt, 0), option_len(opt));
+ req_options[option_len(opt)] = OPTION_END;
+ }
+
+ switch (mess_type)
+ {
+ case DHCPDECLINE:
+ if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
+ option_addr(opt).s_addr != server_id(context, override, fallback).s_addr)
+ return 0;
+
+ /* sanitise any message. Paranoid? Moi? */
+ sanitise(option_find(mess, sz, OPTION_MESSAGE, 1), daemon->dhcp_buff);
+
+ if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
+ return 0;
+
+ log_packet("DHCPDECLINE", option_ptr(opt, 0), emac, emac_len, iface_name, daemon->dhcp_buff, mess->xid);
+
+ if (lease && lease->addr.s_addr == option_addr(opt).s_addr)
+ lease_prune(lease, now);
+
+ if (have_config(config, CONFIG_ADDR) &&
+ config->addr.s_addr == option_addr(opt).s_addr)
+ {
+ prettyprint_time(daemon->dhcp_buff, DECLINE_BACKOFF);
+ my_syslog(MS_DHCP | LOG_WARNING, _("disabling DHCP static address %s for %s"),
+ inet_ntoa(config->addr), daemon->dhcp_buff);
+ config->flags |= CONFIG_DECLINED;
+ config->decline_time = now;
+ }
+ else
+ /* make sure this host gets a different address next time. */
+ for (; context; context = context->current)
+ context->addr_epoch++;
+
+ return 0;
+
+ case DHCPRELEASE:
+ if (!(context = narrow_context(context, mess->ciaddr, netid)) ||
+ !(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
+ option_addr(opt).s_addr != server_id(context, override, fallback).s_addr)
+ return 0;
+
+ if (lease && lease->addr.s_addr == mess->ciaddr.s_addr)
+ lease_prune(lease, now);
+ else
+ message = _("unknown lease");
+
+ log_packet("DHCPRELEASE", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid);
+
+ return 0;
+
+ case DHCPDISCOVER:
+ if (ignore || have_config(config, CONFIG_DISABLE))
+ {
+ message = _("ignored");
+ opt = NULL;
+ }
+ else
+ {
+ struct in_addr addr, conf;
+
+ addr.s_addr = conf.s_addr = 0;
+
+ if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
+ addr = option_addr(opt);
+
+ if (have_config(config, CONFIG_ADDR))
+ {
+ char *addrs = inet_ntoa(config->addr);
+
+ if ((ltmp = lease_find_by_addr(config->addr)) &&
+ ltmp != lease &&
+ !config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type))
+ {
+ int len;
+ unsigned char *mac = extended_hwaddr(ltmp->hwaddr_type, ltmp->hwaddr_len,
+ ltmp->hwaddr, ltmp->clid_len, ltmp->clid, &len);
+ my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is leased to %s"),
+ addrs, print_mac(daemon->namebuff, mac, len));
+ }
+ else
+ {
+ struct dhcp_context *tmp;
+ for (tmp = context; tmp; tmp = tmp->current)
+ if (context->router.s_addr == config->addr.s_addr)
+ break;
+ if (tmp)
+ my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by the server or relay"), addrs);
+ else if (have_config(config, CONFIG_DECLINED) &&
+ difftime(now, config->decline_time) < (float)DECLINE_BACKOFF)
+ my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs);
+ else
+ conf = config->addr;
+ }
+ }
+
+ if (conf.s_addr)
+ mess->yiaddr = conf;
+ else if (lease &&
+ address_available(context, lease->addr, netid) &&
+ !config_find_by_address(daemon->dhcp_conf, lease->addr))
+ mess->yiaddr = lease->addr;
+ else if (opt && address_available(context, addr, netid) && !lease_find_by_addr(addr) &&
+ !config_find_by_address(daemon->dhcp_conf, addr))
+ mess->yiaddr = addr;
+ else if (emac_len == 0)
+ message = _("no unique-id");
+ else if (!address_allocate(context, &mess->yiaddr, emac, emac_len, netid, now))
+ message = _("no address available");
+ }
+
+ log_packet("DHCPDISCOVER", opt ? option_ptr(opt, 0) : NULL, emac, emac_len, iface_name, message, mess->xid);
+
+ if (message || !(context = narrow_context(context, mess->yiaddr, netid)))
+ return 0;
+
+ log_packet("DHCPOFFER" , &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid);
+
+ if (context->netid.net)
+ {
+ context->netid.next = netid;
+ netid = &context->netid;
+ }
+
+ time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4));
+ clear_packet(mess, end);
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr));
+ option_put(mess, end, OPTION_LEASE_TIME, 4, time);
+ /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */
+ if (time != 0xffffffff)
+ {
+ option_put(mess, end, OPTION_T1, 4, (time/2));
+ option_put(mess, end, OPTION_T2, 4, (time*7)/8);
+ }
+ do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr),
+ domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid);
+
+ return dhcp_packet_size(mess, netid, agent_id, real_end);
+
+ case DHCPREQUEST:
+ if (ignore || have_config(config, CONFIG_DISABLE))
+ return 0;
+ if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
+ {
+ /* SELECTING or INIT_REBOOT */
+ mess->yiaddr = option_addr(opt);
+
+ /* send vendor and user class info for new or recreated lease */
+ do_classes = 1;
+
+ if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)))
+ {
+ /* SELECTING */
+ selecting = 1;
+
+ if (override.s_addr != 0)
+ {
+ if (option_addr(opt).s_addr != override.s_addr)
+ return 0;
+ }
+ else
+ {
+ for (; context; context = context->current)
+ if (context->local.s_addr == option_addr(opt).s_addr)
+ break;
+
+ if (!context)
+ {
+ /* In auth mode, a REQUEST sent to the wrong server
+ should be faulted, so that the client establishes
+ communication with us, otherwise, silently ignore. */
+ if (!(daemon->options & OPT_AUTHORITATIVE))
+ return 0;
+ message = _("wrong server-ID");
+ }
+ }
+
+ /* If a lease exists for this host and another address, squash it. */
+ if (lease && lease->addr.s_addr != mess->yiaddr.s_addr)
+ {
+ lease_prune(lease, now);
+ lease = NULL;
+ }
+ }
+ else
+ {
+ /* INIT-REBOOT */
+ if (!lease && !(daemon->options & OPT_AUTHORITATIVE))
+ return 0;
+
+ if (lease && lease->addr.s_addr != mess->yiaddr.s_addr)
+ {
+ message = _("wrong address");
+ /* avoid loops when client brain-dead */
+ lease_prune(lease, now);
+ lease = NULL;
+ }
+ }
+ }
+ else
+ {
+ /* RENEWING or REBINDING */
+ /* Check existing lease for this address.
+ We allow it to be missing if dhcp-authoritative mode
+ as long as we can allocate the lease now - checked below.
+ This makes for a smooth recovery from a lost lease DB */
+ if ((lease && mess->ciaddr.s_addr != lease->addr.s_addr) ||
+ (!lease && !(daemon->options & OPT_AUTHORITATIVE)))
+ {
+ message = _("lease not found");
+ /* ensure we broadcast NAK */
+ unicast_dest = 0;
+ }
+ /* desynchronise renewals */
+ fuzz = rand16();
+ mess->yiaddr = mess->ciaddr;
+ }
+
+ log_packet("DHCPREQUEST", &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid);
+
+ if (!message)
+ {
+ struct dhcp_config *addr_config;
+ struct dhcp_context *tmp = NULL;
+
+ if (have_config(config, CONFIG_ADDR))
+ for (tmp = context; tmp; tmp = tmp->current)
+ if (context->router.s_addr == config->addr.s_addr)
+ break;
+
+ if (!(context = narrow_context(context, mess->yiaddr, netid)))
+ {
+ /* If a machine moves networks whilst it has a lease, we catch that here. */
+ message = _("wrong network");
+ /* ensure we broadcast NAK */
+ unicast_dest = 0;
+ }
+
+ /* Check for renewal of a lease which is outside the allowed range. */
+ else if (!address_available(context, mess->yiaddr, netid) &&
+ (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr))
+ message = _("address not available");
+
+ /* Check if a new static address has been configured. Be very sure that
+ when the client does DISCOVER, it will get the static address, otherwise
+ an endless protocol loop will ensue. */
+ else if (!tmp && !selecting &&
+ have_config(config, CONFIG_ADDR) &&
+ (!have_config(config, CONFIG_DECLINED) ||
+ difftime(now, config->decline_time) > (float)DECLINE_BACKOFF) &&
+ config->addr.s_addr != mess->yiaddr.s_addr &&
+ (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease))
+ message = _("static lease available");
+
+ /* Check to see if the address is reserved as a static address for another host */
+ else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config)
+ message = _("address reserved");
+
+ else if (!lease && (ltmp = lease_find_by_addr(mess->yiaddr)))
+ {
+ /* If a host is configured with more than one MAC address, it's OK to 'nix
+ a lease from one of it's MACs to give the address to another. */
+ if (config && config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type))
+ {
+ my_syslog(MS_DHCP | LOG_INFO, _("abandoning lease to %s of %s"),
+ print_mac(daemon->namebuff, ltmp->hwaddr, ltmp->hwaddr_len),
+ inet_ntoa(ltmp->addr));
+ lease = ltmp;
+ }
+ else
+ message = _("address in use");
+ }
+
+ if (!message)
+ {
+ if (emac_len == 0)
+ message = _("no unique-id");
+
+ else if (!lease)
+ {
+ if ((lease = lease_allocate(mess->yiaddr)))
+ do_classes = 1;
+ else
+ message = _("no leases left");
+ }
+ }
+ }
+
+ if (message)
+ {
+ log_packet("DHCPNAK", &mess->yiaddr, emac, emac_len, iface_name, message, mess->xid);
+
+ mess->yiaddr.s_addr = 0;
+ clear_packet(mess, end);
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr));
+ option_put_string(mess, end, OPTION_MESSAGE, message, borken_opt);
+ /* This fixes a problem with the DHCP spec, broadcasting a NAK to a host on
+ a distant subnet which unicast a REQ to us won't work. */
+ if (!unicast_dest || mess->giaddr.s_addr != 0 ||
+ mess->ciaddr.s_addr == 0 || is_same_net(context->local, mess->ciaddr, context->netmask))
+ {
+ mess->flags |= htons(0x8000); /* broadcast */
+ mess->ciaddr.s_addr = 0;
+ }
+ }
+ else
+ {
+ if (do_classes)
+ {
+ if (mess->giaddr.s_addr)
+ lease->giaddr = mess->giaddr;
+
+ lease->changed = 1;
+ /* copy user-class and vendor class into new lease, for the script */
+ if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1)))
+ {
+ int len = option_len(opt);
+ unsigned char *ucp = option_ptr(opt, 0);
+ /* If the user-class option started as counted strings, the first byte will be zero. */
+ if (len != 0 && ucp[0] == 0)
+ ucp++, len--;
+ free(lease->userclass);
+ if ((lease->userclass = whine_malloc(len+1)))
+ {
+ memcpy(lease->userclass, ucp, len);
+ lease->userclass[len] = 0;
+ lease->userclass_len = len+1;
+ }
+ }
+ if ((opt = option_find(mess, sz, OPTION_VENDOR_ID, 1)))
+ {
+ int len = option_len(opt);
+ unsigned char *ucp = option_ptr(opt, 0);
+ free(lease->vendorclass);
+ if ((lease->vendorclass = whine_malloc(len+1)))
+ {
+ memcpy(lease->vendorclass, ucp, len);
+ lease->vendorclass[len] = 0;
+ lease->vendorclass_len = len+1;
+ }
+ }
+ if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1)))
+ {
+ int len = option_len(opt);
+ unsigned char *ucp = option_ptr(opt, 0);
+ free(lease->supplied_hostname);
+ if ((lease->supplied_hostname = whine_malloc(len+1)))
+ {
+ memcpy(lease->supplied_hostname, ucp, len);
+ lease->supplied_hostname[len] = 0;
+ lease->supplied_hostname_len = len+1;
+ }
+ }
+ }
+
+ if (!hostname_auth && (client_hostname = host_from_dns(mess->yiaddr)))
+ {
+ hostname = client_hostname;
+ hostname_auth = 1;
+ }
+
+ if (context->netid.net)
+ {
+ context->netid.next = netid;
+ netid = &context->netid;
+ }
+
+ time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4));
+ lease_set_hwaddr(lease, mess->chaddr, clid, mess->hlen, mess->htype, clid_len);
+
+ /* if all the netids in the ignore_name list are present, ignore client-supplied name */
+ if (!hostname_auth)
+ {
+ for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next)
+ if ((!id_list->list) || match_netid(id_list->list, netid, 0))
+ break;
+ if (id_list)
+ hostname = NULL;
+ }
+ if (hostname)
+ lease_set_hostname(lease, hostname, hostname_auth);
+
+ lease_set_expires(lease, time, now);
+ lease_set_interface(lease, int_index);
+
+ if (override.s_addr != 0)
+ lease->override = override;
+ else
+ override = lease->override;
+
+ log_packet("DHCPACK", &mess->yiaddr, emac, emac_len, iface_name, hostname, mess->xid);
+
+ clear_packet(mess, end);
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr));
+ option_put(mess, end, OPTION_LEASE_TIME, 4, time);
+ if (time != 0xffffffff)
+ {
+ while (fuzz > (time/16))
+ fuzz = fuzz/2;
+ option_put(mess, end, OPTION_T1, 4, (time/2) - fuzz);
+ option_put(mess, end, OPTION_T2, 4, ((time/8)*7) - fuzz);
+ }
+ do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr),
+ domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid);
+ }
+
+ return dhcp_packet_size(mess, netid, agent_id, real_end);
+
+ case DHCPINFORM:
+ if (ignore || have_config(config, CONFIG_DISABLE))
+ message = _("ignored");
+
+ log_packet("DHCPINFORM", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid);
+
+ if (message || mess->ciaddr.s_addr == 0)
+ return 0;
+
+ /* For DHCPINFORM only, cope without a valid context */
+ context = narrow_context(context, mess->ciaddr, netid);
+
+ /* Find a least based on IP address if we didn't
+ get one from MAC address/client-d */
+ if (!lease &&
+ (lease = lease_find_by_addr(mess->ciaddr)) &&
+ lease->hostname)
+ hostname = lease->hostname;
+
+ if (!hostname)
+ hostname = host_from_dns(mess->ciaddr);
+
+ log_packet("DHCPACK", &mess->ciaddr, emac, emac_len, iface_name, hostname, mess->xid);
+
+ if (context && context->netid.net)
+ {
+ context->netid.next = netid;
+ netid = &context->netid;
+ }
+
+ if (lease)
+ {
+ if (override.s_addr != 0)
+ lease->override = override;
+ else
+ override = lease->override;
+ }
+
+ clear_packet(mess, end);
+ option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
+ option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr));
+
+ if (lease)
+ {
+ if (lease->expires == 0)
+ time = 0xffffffff;
+ else
+ time = (unsigned int)difftime(lease->expires, now);
+ option_put(mess, end, OPTION_LEASE_TIME, 4, time);
+ lease_set_interface(lease, int_index);
+ }
+
+ do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr),
+ domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid);
+
+ *is_inform = 1; /* handle reply differently */
+ return dhcp_packet_size(mess, netid, agent_id, real_end);
+ }
+
+ return 0;
+}
+
+/* find a good value to use as MAC address for logging and address-allocation hashing.
+ This is normally just the chaddr field from the DHCP packet,
+ but eg Firewire will have hlen == 0 and use the client-id instead.
+ This could be anything, but will normally be EUI64 for Firewire.
+ We assume that if the first byte of the client-id equals the htype byte
+ then the client-id is using the usual encoding and use the rest of the
+ client-id: if not we can use the whole client-id. This should give
+ sane MAC address logs. */
+unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr,
+ int clid_len, unsigned char *clid, int *len_out)
+{
+ if (hwlen == 0 && clid && clid_len > 3)
+ {
+ if (clid[0] == hwtype)
+ {
+ *len_out = clid_len - 1 ;
+ return clid + 1;
+ }
+
+#if defined(ARPHRD_EUI64) && defined(ARPHRD_IEEE1394)
+ if (clid[0] == ARPHRD_EUI64 && hwtype == ARPHRD_IEEE1394)
+ {
+ *len_out = clid_len - 1 ;
+ return clid + 1;
+ }
+#endif
+
+ *len_out = clid_len;
+ return clid;
+ }
+
+ *len_out = hwlen;
+ return hwaddr;
+}
+
+static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt)
+{
+ unsigned int time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
+
+ if (opt)
+ {
+ unsigned int req_time = option_uint(opt, 0, 4);
+ if (req_time < 120 )
+ req_time = 120; /* sanity */
+ if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time))
+ time = req_time;
+ }
+
+ return time;
+}
+
+static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback)
+{
+ if (override.s_addr != 0)
+ return override;
+ else if (context)
+ return context->local;
+ else
+ return fallback;
+}
+
+static int sanitise(unsigned char *opt, char *buf)
+{
+ char *p;
+ int i;
+
+ *buf = 0;
+
+ if (!opt)
+ return 0;
+
+ p = option_ptr(opt, 0);
+
+ for (i = option_len(opt); i > 0; i--)
+ {
+ char c = *p++;
+ if (isprint((int)c))
+ *buf++ = c;
+ }
+ *buf = 0; /* add terminator */
+
+ return 1;
+}
+
+static void log_packet(char *type, void *addr, unsigned char *ext_mac,
+ int mac_len, char *interface, char *string, u32 xid)
+{
+ struct in_addr a;
+
+ /* addr may be misaligned */
+ if (addr)
+ memcpy(&a, addr, sizeof(a));
+
+ print_mac(daemon->namebuff, ext_mac, mac_len);
+
+ if(daemon->options & OPT_LOG_OPTS)
+ my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s",
+ ntohl(xid),
+ type,
+ interface,
+ addr ? inet_ntoa(a) : "",
+ addr ? " " : "",
+ daemon->namebuff,
+ string ? string : "");
+ else
+ my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s",
+ type,
+ interface,
+ addr ? inet_ntoa(a) : "",
+ addr ? " " : "",
+ daemon->namebuff,
+ string ? string : "");
+}
+
+static void log_options(unsigned char *start, u32 xid)
+{
+ while (*start != OPTION_END)
+ {
+ int is_ip, is_name, i;
+ char *text = option_string(start[0], &is_ip, &is_name);
+ unsigned char trunc = option_len(start);
+
+ if (is_ip)
+ for (daemon->namebuff[0]= 0, i = 0; i <= trunc - INADDRSZ; i += INADDRSZ)
+ {
+ if (i != 0)
+ strncat(daemon->namebuff, ", ", 256 - strlen(daemon->namebuff));
+ strncat(daemon->namebuff, inet_ntoa(option_addr_arr(start, i)), 256 - strlen(daemon->namebuff));
+ }
+ else if (!is_name || !sanitise(start, daemon->namebuff))
+ {
+ if (trunc > 13)
+ trunc = 13;
+ print_mac(daemon->namebuff, option_ptr(start, 0), trunc);
+ }
+
+ my_syslog(MS_DHCP | LOG_INFO, "%u sent size:%3d option:%3d%s%s%s%s%s",
+ ntohl(xid), option_len(start), start[0],
+ text ? ":" : "", text ? text : "",
+ trunc == 0 ? "" : " ",
+ trunc == 0 ? "" : daemon->namebuff,
+ trunc == option_len(start) ? "" : "...");
+ start += start[1] + 2;
+ }
+}
+
+static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize)
+{
+ while (1)
+ {
+ if (p > end)
+ return NULL;
+ else if (*p == OPTION_END)
+ return opt == OPTION_END ? p : NULL;
+ else if (*p == OPTION_PAD)
+ p++;
+ else
+ {
+ int opt_len;
+ if (p > end - 2)
+ return NULL; /* malformed packet */
+ opt_len = option_len(p);
+ if (p > end - (2 + opt_len))
+ return NULL; /* malformed packet */
+ if (*p == opt && opt_len >= minsize)
+ return p;
+ p += opt_len + 2;
+ }
+ }
+}
+
+static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize)
+{
+ unsigned char *ret, *overload;
+
+ /* skip over DHCP cookie; */
+ if ((ret = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, opt_type, minsize)))
+ return ret;
+
+ /* look for overload option. */
+ if (!(overload = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, OPTION_OVERLOAD, 1)))
+ return NULL;
+
+ /* Can we look in filename area ? */
+ if ((overload[2] & 1) &&
+ (ret = option_find1(&mess->file[0], &mess->file[128], opt_type, minsize)))
+ return ret;
+
+ /* finally try sname area */
+ if ((overload[2] & 2) &&
+ (ret = option_find1(&mess->sname[0], &mess->sname[64], opt_type, minsize)))
+ return ret;
+
+ return NULL;
+}
+
+static struct in_addr option_addr_arr(unsigned char *opt, int offset)
+{
+ /* this worries about unaligned data in the option. */
+ /* struct in_addr is network byte order */
+ struct in_addr ret;
+
+ memcpy(&ret, option_ptr(opt, offset), INADDRSZ);
+
+ return ret;
+}
+
+static struct in_addr option_addr(unsigned char *opt)
+{
+ return option_addr_arr(opt, 0);
+}
+
+static unsigned int option_uint(unsigned char *opt, int offset, int size)
+{
+ /* this worries about unaligned data and byte order */
+ unsigned int ret = 0;
+ int i;
+ unsigned char *p = option_ptr(opt, offset);
+
+ for (i = 0; i < size; i++)
+ ret = (ret << 8) | *p++;
+
+ return ret;
+}
+
+static unsigned char *dhcp_skip_opts(unsigned char *start)
+{
+ while (*start != 0)
+ start += start[1] + 2;
+ return start;
+}
+
+/* only for use when building packet: doesn't check for bad data. */
+static unsigned char *find_overload(struct dhcp_packet *mess)
+{
+ unsigned char *p = &mess->options[0] + sizeof(u32);
+
+ while (*p != 0)
+ {
+ if (*p == OPTION_OVERLOAD)
+ return p;
+ p += p[1] + 2;
+ }
+ return NULL;
+}
+
+static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid,
+ unsigned char *agent_id, unsigned char *real_end)
+{
+ unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32));
+ unsigned char *overload;
+ size_t ret;
+ struct dhcp_netid_list *id_list;
+ struct dhcp_netid *n;
+
+ /* move agent_id back down to the end of the packet */
+ if (agent_id)
+ {
+ memmove(p, agent_id, real_end - agent_id);
+ p += real_end - agent_id;
+ memset(p, 0, real_end - p); /* in case of overlap */
+ }
+
+ /* We do logging too */
+ if (netid && (daemon->options & OPT_LOG_OPTS))
+ {
+ char *s = daemon->namebuff;
+ for (*s = 0; netid; netid = netid->next)
+ {
+ /* kill dupes. */
+ for (n = netid->next; n; n = n->next)
+ if (strcmp(netid->net, n->net) == 0)
+ break;
+
+ if (!n)
+ {
+ strncat (s, netid->net, (MAXDNAME-1) - strlen(s));
+ if (netid->next)
+ strncat (s, ", ", (MAXDNAME-1) - strlen(s));
+ }
+ }
+ my_syslog(MS_DHCP | LOG_INFO, _("%u tags: %s"), ntohl(mess->xid), s);
+ }
+
+ /* add END options to the regions. */
+ overload = find_overload(mess);
+
+ if (overload && (option_uint(overload, 0, 1) & 1))
+ {
+ *dhcp_skip_opts(mess->file) = OPTION_END;
+ if (daemon->options & OPT_LOG_OPTS)
+ log_options(mess->file, mess->xid);
+ }
+ else if ((daemon->options & OPT_LOG_OPTS) && strlen((char *)mess->file) != 0)
+ my_syslog(MS_DHCP | LOG_INFO, _("%u bootfile name: %s"), ntohl(mess->xid), (char *)mess->file);
+
+ if (overload && (option_uint(overload, 0, 1) & 2))
+ {
+ *dhcp_skip_opts(mess->sname) = OPTION_END;
+ if (daemon->options & OPT_LOG_OPTS)
+ log_options(mess->sname, mess->xid);
+ }
+ else if ((daemon->options & OPT_LOG_OPTS) && strlen((char *)mess->sname) != 0)
+ my_syslog(MS_DHCP | LOG_INFO, _("%u server name: %s"), ntohl(mess->xid), (char *)mess->sname);
+
+
+ *p++ = OPTION_END;
+
+ if (daemon->options & OPT_LOG_OPTS)
+ {
+ if (mess->siaddr.s_addr != 0)
+ my_syslog(MS_DHCP | LOG_INFO, _("%u next server: %s"), ntohl(mess->xid), inet_ntoa(mess->siaddr));
+
+ log_options(&mess->options[0] + sizeof(u32), mess->xid);
+ }
+
+ for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next)
+ if (match_netid(id_list->list, netid, 0))
+ mess->flags |= htons(0x8000); /* force broadcast */
+
+ ret = (size_t)(p - (unsigned char *)mess);
+
+ if (ret < MIN_PACKETSZ)
+ ret = MIN_PACKETSZ;
+
+ return ret;
+}
+
+static unsigned char *free_space(struct dhcp_packet *mess, unsigned char *end, int opt, int len)
+{
+ unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32));
+
+ if (p + len + 3 >= end)
+ /* not enough space in options area, try and use overload, if poss */
+ {
+ unsigned char *overload;
+
+ if (!(overload = find_overload(mess)) &&
+ (mess->file[0] == 0 || mess->sname[0] == 0))
+ {
+ /* attempt to overload fname and sname areas, we've reserved space for the
+ overflow option previuously. */
+ overload = p;
+ *(p++) = OPTION_OVERLOAD;
+ *(p++) = 1;
+ }
+
+ p = NULL;
+
+ /* using filename field ? */
+ if (overload)
+ {
+ if (mess->file[0] == 0)
+ overload[2] |= 1;
+
+ if (overload[2] & 1)
+ {
+ p = dhcp_skip_opts(mess->file);
+ if (p + len + 3 >= mess->file + sizeof(mess->file))
+ p = NULL;
+ }
+
+ if (!p)
+ {
+ /* try to bring sname into play (it may be already) */
+ if (mess->sname[0] == 0)
+ overload[2] |= 2;
+
+ if (overload[2] & 2)
+ {
+ p = dhcp_skip_opts(mess->sname);
+ if (p + len + 3 >= mess->sname + sizeof(mess->file))
+ p = NULL;
+ }
+ }
+ }
+
+ if (!p)
+ my_syslog(MS_DHCP | LOG_WARNING, _("cannot send DHCP/BOOTP option %d: no space left in packet"), opt);
+ }
+
+ if (p)
+ {
+ *(p++) = opt;
+ *(p++) = len;
+ }
+
+ return p;
+}
+
+static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val)
+{
+ int i;
+ unsigned char *p = free_space(mess, end, opt, len);
+
+ if (p)
+ for (i = 0; i < len; i++)
+ *(p++) = val >> (8 * (len - (i + 1)));
+}
+
+static void option_put_string(struct dhcp_packet *mess, unsigned char *end, int opt,
+ char *string, int null_term)
+{
+ unsigned char *p;
+ size_t len = strlen(string);
+
+ if (null_term && len != 255)
+ len++;
+
+ if ((p = free_space(mess, end, opt, len)))
+ memcpy(p, string, len);
+}
+
+/* return length, note this only does the data part */
+static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *context, int null_term)
+{
+ int len = opt->len;
+
+ if ((opt->flags & DHOPT_STRING) && null_term && len != 255)
+ len++;
+
+ if (p && len != 0)
+ {
+ if (context && (opt->flags & DHOPT_ADDR))
+ {
+ int j;
+ struct in_addr *a = (struct in_addr *)opt->val;
+ for (j = 0; j < opt->len; j+=INADDRSZ, a++)
+ {
+ /* zero means "self" (but not in vendorclass options.) */
+ if (a->s_addr == 0)
+ memcpy(p, &context->local, INADDRSZ);
+ else
+ memcpy(p, a, INADDRSZ);
+ p += INADDRSZ;
+ }
+ }
+ else
+ memcpy(p, opt->val, len);
+ }
+ return len;
+}
+
+static int in_list(unsigned char *list, int opt)
+{
+ int i;
+
+ /* If no requested options, send everything, not nothing. */
+ if (!list)
+ return 1;
+
+ for (i = 0; list[i] != OPTION_END; i++)
+ if (opt == list[i])
+ return 1;
+
+ return 0;
+}
+
+static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *opts, int opt)
+{
+ struct dhcp_opt *tmp;
+ for (tmp = opts; tmp; tmp = tmp->next)
+ if (tmp->opt == opt && !(tmp->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR)))
+ if (match_netid(tmp->netid, netid, netid ? 0 : 1))
+ return tmp;
+
+ return netid ? option_find2(NULL, opts, opt) : NULL;
+}
+
+/* mark vendor-encapsulated options which match the client-supplied or
+ config-supplied vendor class */
+static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt)
+{
+ for (; dopt; dopt = dopt->next)
+ {
+ dopt->flags &= ~DHOPT_VENDOR_MATCH;
+ if (opt && (dopt->flags & DHOPT_VENDOR))
+ {
+ int i, len = 0;
+ if (dopt->u.vendor_class)
+ len = strlen((char *)dopt->u.vendor_class);
+ for (i = 0; i <= (option_len(opt) - len); i++)
+ if (len == 0 || memcmp(dopt->u.vendor_class, option_ptr(opt, i), len) == 0)
+ {
+ dopt->flags |= DHOPT_VENDOR_MATCH;
+ break;
+ }
+ }
+ }
+}
+
+static void do_encap_opts(struct dhcp_opt *opt, int encap, int flag,
+ struct dhcp_packet *mess, unsigned char *end, int null_term)
+{
+ int len, enc_len;
+ struct dhcp_opt *start;
+ unsigned char *p;
+
+ /* find size in advance */
+ for (enc_len = 0, start = opt; opt; opt = opt->next)
+ if (opt->flags & flag)
+ {
+ int new = do_opt(opt, NULL, NULL, null_term) + 2;
+ if (enc_len + new <= 255)
+ enc_len += new;
+ else
+ {
+ p = free_space(mess, end, encap, enc_len);
+ for (; start && start != opt; start = start->next)
+ if (p && (start->flags & flag))
+ {
+ len = do_opt(start, p + 2, NULL, null_term);
+ *(p++) = start->opt;
+ *(p++) = len;
+ p += len;
+ }
+ enc_len = new;
+ start = opt;
+ }
+ }
+
+ if (enc_len != 0 &&
+ (p = free_space(mess, end, encap, enc_len + 1)))
+ {
+ for (; start; start = start->next)
+ if (start->flags & flag)
+ {
+ len = do_opt(start, p + 2, NULL, null_term);
+ *(p++) = start->opt;
+ *(p++) = len;
+ p += len;
+ }
+ *p = OPTION_END;
+ }
+}
+
+static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid)
+{
+ unsigned char *p;
+
+ option_put_string(mess, end, OPTION_VENDOR_ID, "PXEClient", 0);
+ if (uuid && (p = free_space(mess, end, OPTION_PXE_UUID, 17)))
+ memcpy(p, uuid, 17);
+}
+
+static int prune_vendor_opts(struct dhcp_netid *netid)
+{
+ int force = 0;
+ struct dhcp_opt *opt;
+
+ /* prune vendor-encapsulated options based on netid, and look if we're forcing them to be sent */
+ for (opt = daemon->dhcp_opts; opt; opt = opt->next)
+ if (opt->flags & DHOPT_VENDOR_MATCH)
+ {
+ if (!match_netid(opt->netid, netid, 1))
+ opt->flags &= ~DHOPT_VENDOR_MATCH;
+ else if (opt->flags & DHOPT_FORCE)
+ force = 1;
+ }
+ return force;
+}
+
+static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid)
+{
+#define NUM_OPTS 4
+
+ unsigned char *p, *q;
+ struct pxe_service *service;
+ static struct dhcp_opt *o, *ret;
+ int i, j = NUM_OPTS - 1;
+
+ /* We pass back references to these, hence they are declared static */
+ static unsigned char discovery_control;
+ static unsigned char fake_prompt[] = { 0, 'P', 'X', 'E' };
+ static struct dhcp_opt *fake_opts = NULL;
+
+ /* We are found by broadcast, so disable multicast. It gets switched on again
+ if we point to other servers and don't give a unicast address. Note that
+ we don't provide our own address for services we are the boot server for because unicast
+ discovery is to port 4011 and we don't listen there. If you are using proxy DHCP
+ and DHCP relays, the relay will need to forward to the proxy too. */
+ discovery_control = 2;
+
+ ret = daemon->dhcp_opts;
+
+ if (!fake_opts && !(fake_opts = whine_malloc(NUM_OPTS * sizeof(struct dhcp_opt))))
+ return ret;
+
+ for (i = 0; i < NUM_OPTS; i++)
+ {
+ fake_opts[i].flags = DHOPT_VENDOR_MATCH;
+ fake_opts[i].netid = NULL;
+ fake_opts[i].next = i == (NUM_OPTS - 1) ? ret : &fake_opts[i+1];
+ }
+
+ /* create the data for the PXE_MENU and PXE_SERVERS options. */
+ p = (unsigned char *)daemon->dhcp_buff;
+ q = (unsigned char *)daemon->dhcp_buff2;
+
+ for (i = 0, service = daemon->pxe_services; service; service = service->next)
+ if (pxe_arch == service->CSA && match_netid(service->netid, netid, 1))
+ {
+ size_t len = strlen(service->menu);
+ /* opt 43 max size is 255. encapsulated option has type and length
+ bytes, so its max size is 253. */
+ if (p - (unsigned char *)daemon->dhcp_buff + len + 3 < 253)
+ {
+ *(p++) = service->type >> 8;
+ *(p++) = service->type;
+ *(p++) = len;
+ memcpy(p, service->menu, len);
+ p += len;
+ i++;
+ }
+ else
+ {
+ toobig:
+ my_syslog(MS_DHCP | LOG_ERR, _("PXE menu too large"));
+ return daemon->dhcp_opts;
+ }
+
+ if (!service->basename)
+ {
+ if (service->server.s_addr != 0)
+ {
+ if (q - (unsigned char *)daemon->dhcp_buff2 + 3 + INADDRSZ >= 253)
+ goto toobig;
+
+ /* Boot service with known address - give it */
+ *(q++) = service->type >> 8;
+ *(q++) = service->type;
+ *(q++) = 1;
+ /* dest misaligned */
+ memcpy(q, &service->server.s_addr, INADDRSZ);
+ q += INADDRSZ;
+ }
+ else if (service->type != 0)
+ /* We're not supplying a server, so let the client multicast.
+ type zero is "local boot" so no need for M/C on that. */
+ discovery_control = 0;
+ }
+ }
+
+ /* if no prompt, wait forever if there's a choice */
+ fake_prompt[0] = (i > 1) ? 255 : 0;
+
+ if (i == 0)
+ discovery_control = 8; /* no menu - just use use mess->filename */
+ else
+ {
+ ret = &fake_opts[j--];
+ ret->len = p - (unsigned char *)daemon->dhcp_buff;
+ ret->val = (unsigned char *)daemon->dhcp_buff;
+ ret->opt = SUBOPT_PXE_MENU;
+
+ if (q - (unsigned char *)daemon->dhcp_buff2 != 0)
+ {
+ ret = &fake_opts[j--];
+ ret->len = q - (unsigned char *)daemon->dhcp_buff2;
+ ret->val = (unsigned char *)daemon->dhcp_buff2;
+ ret->opt = SUBOPT_PXE_SERVERS;
+ }
+ }
+
+ for (o = daemon->dhcp_opts; o; o = o->next)
+ if ((o->flags & DHOPT_VENDOR_MATCH) && o->opt == SUBOPT_PXE_MENU_PROMPT)
+ break;
+
+ if (!o)
+ {
+ ret = &fake_opts[j--];
+ ret->len = sizeof(fake_prompt);
+ ret->val = fake_prompt;
+ ret->opt = SUBOPT_PXE_MENU_PROMPT;
+ }
+
+ if (discovery_control != 0)
+ {
+ ret = &fake_opts[j--];
+ ret->len = 1;
+ ret->opt = SUBOPT_PXE_DISCOVERY;
+ ret->val= &discovery_control;
+ }
+
+ return ret;
+}
+
+static void clear_packet(struct dhcp_packet *mess, unsigned char *end)
+{
+ memset(mess->sname, 0, sizeof(mess->sname));
+ memset(mess->file, 0, sizeof(mess->file));
+ memset(&mess->options[0] + sizeof(u32), 0, end - (&mess->options[0] + sizeof(u32)));
+ mess->siaddr.s_addr = 0;
+}
+
+struct dhcp_boot *find_boot(struct dhcp_netid *netid)
+{
+ struct dhcp_boot *boot;
+
+ /* decide which dhcp-boot option we're using */
+ for (boot = daemon->boot_config; boot; boot = boot->next)
+ if (match_netid(boot->netid, netid, 0))
+ break;
+ if (!boot)
+ /* No match, look for one without a netid */
+ for (boot = daemon->boot_config; boot; boot = boot->next)
+ if (match_netid(boot->netid, netid, 1))
+ break;
+
+ return boot;
+}
+
+static void do_options(struct dhcp_context *context,
+ struct dhcp_packet *mess,
+ unsigned char *end,
+ unsigned char *req_options,
+ char *hostname,
+ char *domain, char *config_domain,
+ struct dhcp_netid *netid,
+ struct in_addr subnet_addr,
+ unsigned char fqdn_flags,
+ int null_term, int pxe_arch,
+ unsigned char *uuid)
+{
+ struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts;
+ struct dhcp_boot *boot;
+ unsigned char *p;
+ int i, len, force_encap = 0;
+ unsigned char f0 = 0, s0 = 0;
+ int done_file = 0, done_server = 0;
+
+ if (config_domain && (!domain || !hostname_isequal(domain, config_domain)))
+ my_syslog(MS_DHCP | LOG_WARNING, _("Ignoring domain %s for DHCP host name %s"), config_domain, hostname);
+
+ /* logging */
+ if ((daemon->options & OPT_LOG_OPTS) && req_options)
+ {
+ char *q = daemon->namebuff;
+ for (i = 0; req_options[i] != OPTION_END; i++)
+ {
+ char *s = option_string(req_options[i], NULL, NULL);
+ q += snprintf(q, MAXDNAME - (q - daemon->namebuff),
+ "%d%s%s%s",
+ req_options[i],
+ s ? ":" : "",
+ s ? s : "",
+ req_options[i+1] == OPTION_END ? "" : ", ");
+ if (req_options[i+1] == OPTION_END || (q - daemon->namebuff) > 40)
+ {
+ q = daemon->namebuff;
+ my_syslog(MS_DHCP | LOG_INFO, _("%u requested options: %s"), ntohl(mess->xid), daemon->namebuff);
+ }
+ }
+ }
+
+ if (context)
+ mess->siaddr = context->local;
+
+ /* See if we can send the boot stuff as options.
+ To do this we need a requested option list, BOOTP
+ and very old DHCP clients won't have this, we also
+ provide an manual option to disable it.
+ Some PXE ROMs have bugs (surprise!) and need zero-terminated
+ names, so we always send those. */
+ if ((boot = find_boot(netid)))
+ {
+ if (boot->sname)
+ {
+ if (!(daemon->options & OPT_NO_OVERRIDE) &&
+ req_options &&
+ in_list(req_options, OPTION_SNAME))
+ option_put_string(mess, end, OPTION_SNAME, boot->sname, 1);
+ else
+ strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname)-1);
+ }
+
+ if (boot->file)
+ {
+ if (!(daemon->options & OPT_NO_OVERRIDE) &&
+ req_options &&
+ in_list(req_options, OPTION_FILENAME))
+ option_put_string(mess, end, OPTION_FILENAME, boot->file, 1);
+ else
+ strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1);
+ }
+
+ if (boot->next_server.s_addr)
+ mess->siaddr = boot->next_server;
+ }
+ else
+ /* Use the values of the relevant options if no dhcp-boot given and
+ they're not explicitly asked for as options. OPTION_END is used
+ as an internal way to specify siaddr without using dhcp-boot, for use in
+ dhcp-optsfile. */
+ {
+ if ((!req_options || !in_list(req_options, OPTION_FILENAME)) && mess->file[0] == 0 &&
+ (opt = option_find2(netid, config_opts, OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE))
+ {
+ strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file)-1);
+ done_file = 1;
+ }
+
+ if ((!req_options || !in_list(req_options, OPTION_SNAME)) &&
+ (opt = option_find2(netid, config_opts, OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE))
+ {
+ strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname)-1);
+ done_server = 1;
+ }
+
+ if ((opt = option_find2(netid, config_opts, OPTION_END)))
+ mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr;
+ }
+
+ /* We don't want to do option-overload for BOOTP, so make the file and sname
+ fields look like they are in use, even when they aren't. This gets restored
+ at the end of this function. */
+
+ if (!req_options || (daemon->options & OPT_NO_OVERRIDE))
+ {
+ f0 = mess->file[0];
+ mess->file[0] = 1;
+ s0 = mess->sname[0];
+ mess->sname[0] = 1;
+ }
+
+ /* At this point, if mess->sname or mess->file are zeroed, they are available
+ for option overload, reserve space for the overload option. */
+ if (mess->file[0] == 0 || mess->sname[0] == 0)
+ end -= 3;
+
+ /* rfc3011 says this doesn't need to be in the requested options list. */
+ if (subnet_addr.s_addr)
+ option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr));
+
+ /* replies to DHCPINFORM may not have a valid context */
+ if (context)
+ {
+ if (!option_find2(netid, config_opts, OPTION_NETMASK))
+ option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr));
+
+ /* May not have a "guessed" broadcast address if we got no packets via a relay
+ from this net yet (ie just unicast renewals after a restart */
+ if (context->broadcast.s_addr &&
+ !option_find2(netid, config_opts, OPTION_BROADCAST))
+ option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr));
+
+ /* Same comments as broadcast apply, and also may not be able to get a sensible
+ default when using subnet select. User must configure by steam in that case. */
+ if (context->router.s_addr &&
+ in_list(req_options, OPTION_ROUTER) &&
+ !option_find2(netid, config_opts, OPTION_ROUTER))
+ option_put(mess, end, OPTION_ROUTER, INADDRSZ, ntohl(context->router.s_addr));
+
+ if (in_list(req_options, OPTION_DNSSERVER) &&
+ !option_find2(netid, config_opts, OPTION_DNSSERVER))
+ option_put(mess, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr));
+ }
+
+ if (domain && in_list(req_options, OPTION_DOMAINNAME) &&
+ !option_find2(netid, config_opts, OPTION_DOMAINNAME))
+ option_put_string(mess, end, OPTION_DOMAINNAME, domain, null_term);
+
+ /* Note that we ignore attempts to set the fqdn using --dhc-option=81,<name> */
+ if (hostname)
+ {
+ if (in_list(req_options, OPTION_HOSTNAME) &&
+ !option_find2(netid, config_opts, OPTION_HOSTNAME))
+ option_put_string(mess, end, OPTION_HOSTNAME, hostname, null_term);
+
+ if (fqdn_flags != 0)
+ {
+ len = strlen(hostname) + 3;
+
+ if (fqdn_flags & 0x04)
+ len += 2;
+ else if (null_term)
+ len++;
+
+ if (domain)
+ len += strlen(domain) + 1;
+
+ if ((p = free_space(mess, end, OPTION_CLIENT_FQDN, len)))
+ {
+ *(p++) = fqdn_flags;
+ *(p++) = 255;
+ *(p++) = 255;
+
+ if (fqdn_flags & 0x04)
+ {
+ p = do_rfc1035_name(p, hostname);
+ if (domain)
+ p = do_rfc1035_name(p, domain);
+ *p++ = 0;
+ }
+ else
+ {
+ memcpy(p, hostname, strlen(hostname));
+ p += strlen(hostname);
+ if (domain)
+ {
+ *(p++) = '.';
+ memcpy(p, domain, strlen(domain));
+ p += strlen(domain);
+ }
+ if (null_term)
+ *(p++) = 0;
+ }
+ }
+ }
+ }
+
+ for (opt = config_opts; opt; opt = opt->next)
+ {
+ int optno = opt->opt;
+
+ /* was it asked for, or are we sending it anyway? */
+ if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno))
+ continue;
+
+ /* prohibit some used-internally options */
+ if (optno == OPTION_CLIENT_FQDN ||
+ optno == OPTION_MAXMESSAGE ||
+ optno == OPTION_OVERLOAD ||
+ optno == OPTION_PAD ||
+ optno == OPTION_END)
+ continue;
+
+ if (optno == OPTION_SNAME && done_server)
+ continue;
+
+ if (optno == OPTION_FILENAME && done_file)
+ continue;
+
+ /* netids match and not encapsulated? */
+ if (opt != option_find2(netid, config_opts, optno))
+ continue;
+
+ /* For the options we have default values on
+ dhc-option=<optionno> means "don't include this option"
+ not "include a zero-length option" */
+ if (opt->len == 0 &&
+ (optno == OPTION_NETMASK ||
+ optno == OPTION_BROADCAST ||
+ optno == OPTION_ROUTER ||
+ optno == OPTION_DNSSERVER ||
+ optno == OPTION_DOMAINNAME ||
+ optno == OPTION_HOSTNAME))
+ continue;
+
+ /* vendor-class comes from elsewhere for PXE */
+ if (pxe_arch != -1 && optno == OPTION_VENDOR_ID)
+ continue;
+
+ /* always force null-term for filename and servername - buggy PXE again. */
+ len = do_opt(opt, NULL, context,
+ (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term);
+
+ if ((p = free_space(mess, end, optno, len)))
+ {
+ do_opt(opt, p, context,
+ (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term);
+
+ /* If we send a vendor-id, revisit which vendor-ops we consider
+ it appropriate to send. */
+ if (optno == OPTION_VENDOR_ID)
+ match_vendor_opts(p - 2, config_opts);
+ }
+ }
+
+ /* Now send options to be encapsulated in arbitrary options,
+ eg dhcp-option=encap:172,17,.......
+ The may be more that one "outer" to do, so group
+ all the options which match each outer in turn. */
+ for (opt = config_opts; opt; opt = opt->next)
+ opt->flags &= ~DHOPT_ENCAP_DONE;
+
+ for (opt = config_opts; opt; opt = opt->next)
+ if ((opt->flags & (DHOPT_ENCAPSULATE | DHOPT_ENCAP_DONE)) == DHOPT_ENCAPSULATE)
+ {
+ struct dhcp_opt *o;
+ int found = 0;
+
+ for (o = config_opts; o; o = o->next)
+ {
+ o->flags &= ~DHOPT_ENCAP_MATCH;
+ if ((o->flags & DHOPT_ENCAPSULATE) && opt->u.encap == o->u.encap)
+ {
+ o->flags |= DHOPT_ENCAP_DONE;
+ if (match_netid(o->netid, netid, 1) &&
+ (o->flags & DHOPT_FORCE || in_list(req_options, o->u.encap)))
+ {
+ o->flags |= DHOPT_ENCAP_MATCH;
+ found = 1;
+ }
+ }
+ }
+
+ if (found)
+ do_encap_opts(config_opts, opt->u.encap, DHOPT_ENCAP_MATCH, mess, end, null_term);
+ }
+
+ /* Must precede pxe_opts, since it overwrites req_options */
+ force_encap = prune_vendor_opts(netid);
+ if (in_list(req_options, OPTION_VENDOR_CLASS_OPT))
+ force_encap = 1;
+
+ if (pxe_arch != -1)
+ {
+ pxe_misc(mess, end, uuid);
+ config_opts = pxe_opts(pxe_arch, netid);
+ }
+
+ if (force_encap)
+ do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term);
+
+ /* restore BOOTP anti-overload hack */
+ if (!req_options || (daemon->options & OPT_NO_OVERRIDE))
+ {
+ mess->file[0] = f0;
+ mess->sname[0] = s0;
+ }
+}
+
+#endif
+
+
+
+
+
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 20:38:39 +0000