| /* dnsmasq is Copyright (c) 2000-2016 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 |
| |
| static struct dhcp_lease *leases = NULL, *old_leases = NULL; |
| static int dns_dirty, file_dirty, leases_left; |
| |
| static int read_leases(time_t now, FILE *leasestream) |
| { |
| unsigned long ei; |
| struct all_addr addr; |
| struct dhcp_lease *lease; |
| int clid_len, hw_len, hw_type; |
| int items; |
| char *domain = NULL; |
| |
| *daemon->dhcp_buff3 = *daemon->dhcp_buff2 = '\0'; |
| |
| /* client-id max length is 255 which is 255*2 digits + 254 colons |
| borrow DNS packet buffer which is always larger than 1000 bytes |
| |
| Check various buffers are big enough for the code below */ |
| |
| #if (DHCP_BUFF_SZ < 255) || (MAXDNAME < 64) || (PACKETSZ+MAXDNAME+RRFIXEDSZ < 764) |
| # error Buffer size breakage in leasefile parsing. |
| #endif |
| |
| while ((items=fscanf(leasestream, "%255s %255s", daemon->dhcp_buff3, daemon->dhcp_buff2)) == 2) |
| { |
| *daemon->namebuff = *daemon->dhcp_buff = *daemon->packet = '\0'; |
| hw_len = hw_type = clid_len = 0; |
| |
| #ifdef HAVE_DHCP6 |
| if (strcmp(daemon->dhcp_buff3, "duid") == 0) |
| { |
| daemon->duid_len = parse_hex(daemon->dhcp_buff2, (unsigned char *)daemon->dhcp_buff2, 130, NULL, NULL); |
| if (daemon->duid_len < 0) |
| return 0; |
| daemon->duid = safe_malloc(daemon->duid_len); |
| memcpy(daemon->duid, daemon->dhcp_buff2, daemon->duid_len); |
| continue; |
| } |
| #endif |
| |
| if (fscanf(leasestream, " %64s %255s %764s", |
| daemon->namebuff, daemon->dhcp_buff, daemon->packet) != 3) |
| return 0; |
| |
| if (inet_pton(AF_INET, daemon->namebuff, &addr.addr.addr4)) |
| { |
| if ((lease = lease4_allocate(addr.addr.addr4))) |
| domain = get_domain(lease->addr); |
| |
| hw_len = parse_hex(daemon->dhcp_buff2, (unsigned char *)daemon->dhcp_buff2, DHCP_CHADDR_MAX, NULL, &hw_type); |
| /* For backwards compatibility, no explicit MAC address type means ether. */ |
| if (hw_type == 0 && hw_len != 0) |
| hw_type = ARPHRD_ETHER; |
| } |
| #ifdef HAVE_DHCP6 |
| else if (inet_pton(AF_INET6, daemon->namebuff, &addr.addr.addr6)) |
| { |
| char *s = daemon->dhcp_buff2; |
| int lease_type = LEASE_NA; |
| |
| if (s[0] == 'T') |
| { |
| lease_type = LEASE_TA; |
| s++; |
| } |
| |
| if ((lease = lease6_allocate(&addr.addr.addr6, lease_type))) |
| { |
| lease_set_iaid(lease, strtoul(s, NULL, 10)); |
| domain = get_domain6((struct in6_addr *)lease->hwaddr); |
| } |
| } |
| #endif |
| else |
| return 0; |
| |
| if (!lease) |
| die (_("too many stored leases"), NULL, EC_MISC); |
| |
| if (strcmp(daemon->packet, "*") != 0) |
| clid_len = parse_hex(daemon->packet, (unsigned char *)daemon->packet, 255, NULL, NULL); |
| |
| lease_set_hwaddr(lease, (unsigned char *)daemon->dhcp_buff2, (unsigned char *)daemon->packet, |
| hw_len, hw_type, clid_len, now, 0); |
| |
| if (strcmp(daemon->dhcp_buff, "*") != 0) |
| lease_set_hostname(lease, daemon->dhcp_buff, 0, domain, NULL); |
| |
| ei = atol(daemon->dhcp_buff3); |
| |
| #ifdef HAVE_BROKEN_RTC |
| if (ei != 0) |
| lease->expires = (time_t)ei + now; |
| else |
| lease->expires = (time_t)0; |
| lease->length = ei; |
| #else |
| /* strictly time_t is opaque, but this hack should work on all sane systems, |
| even when sizeof(time_t) == 8 */ |
| lease->expires = (time_t)ei; |
| #endif |
| |
| /* set these correctly: the "old" events are generated later from |
| the startup synthesised SIGHUP. */ |
| lease->flags &= ~(LEASE_NEW | LEASE_CHANGED); |
| |
| *daemon->dhcp_buff3 = *daemon->dhcp_buff2 = '\0'; |
| } |
| |
| return (items == 0 || items == EOF); |
| } |
| |
| void lease_init(time_t now) |
| { |
| FILE *leasestream; |
| |
| leases_left = daemon->dhcp_max; |
| |
| if (option_bool(OPT_LEASE_RO)) |
| { |
| /* run "<lease_change_script> init" once to get the |
| initial state of the database. If leasefile-ro is |
| set without a script, we just do without any |
| lease database. */ |
| #ifdef HAVE_SCRIPT |
| if (daemon->lease_change_command) |
| { |
| strcpy(daemon->dhcp_buff, daemon->lease_change_command); |
| strcat(daemon->dhcp_buff, " init"); |
| leasestream = popen(daemon->dhcp_buff, "r"); |
| } |
| else |
| #endif |
| { |
| file_dirty = dns_dirty = 0; |
| return; |
| } |
| |
| } |
| else |
| { |
| /* NOTE: need a+ mode to create file if it doesn't exist */ |
| leasestream = daemon->lease_stream = fopen(daemon->lease_file, "a+"); |
| |
| if (!leasestream) |
| die(_("cannot open or create lease file %s: %s"), daemon->lease_file, EC_FILE); |
| |
| /* a+ mode leaves pointer at end. */ |
| rewind(leasestream); |
| } |
| |
| if (leasestream) |
| { |
| if (!read_leases(now, leasestream)) |
| my_syslog(MS_DHCP | LOG_ERR, _("failed to parse lease database, invalid line: %s %s %s %s ..."), |
| daemon->dhcp_buff3, daemon->dhcp_buff2, |
| daemon->namebuff, daemon->dhcp_buff); |
| |
| if (ferror(leasestream)) |
| die(_("failed to read lease file %s: %s"), daemon->lease_file, EC_FILE); |
| } |
| |
| #ifdef HAVE_SCRIPT |
| if (!daemon->lease_stream) |
| { |
| int rc = 0; |
| |
| /* shell returns 127 for "command not found", 126 for bad permissions. */ |
| if (!leasestream || (rc = pclose(leasestream)) == -1 || WEXITSTATUS(rc) == 127 || WEXITSTATUS(rc) == 126) |
| { |
| if (WEXITSTATUS(rc) == 127) |
| errno = ENOENT; |
| else if (WEXITSTATUS(rc) == 126) |
| errno = EACCES; |
| |
| die(_("cannot run lease-init script %s: %s"), daemon->lease_change_command, EC_FILE); |
| } |
| |
| if (WEXITSTATUS(rc) != 0) |
| { |
| sprintf(daemon->dhcp_buff, "%d", WEXITSTATUS(rc)); |
| die(_("lease-init script returned exit code %s"), daemon->dhcp_buff, WEXITSTATUS(rc) + EC_INIT_OFFSET); |
| } |
| } |
| #endif |
| |
| /* Some leases may have expired */ |
| file_dirty = 0; |
| lease_prune(NULL, now); |
| dns_dirty = 1; |
| } |
| |
| void lease_update_from_configs(void) |
| { |
| /* changes to the config may change current leases. */ |
| |
| struct dhcp_lease *lease; |
| struct dhcp_config *config; |
| char *name; |
| |
| for (lease = leases; lease; lease = lease->next) |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| else if ((config = find_config(daemon->dhcp_conf, NULL, lease->clid, lease->clid_len, |
| lease->hwaddr, lease->hwaddr_len, lease->hwaddr_type, NULL)) && |
| (config->flags & CONFIG_NAME) && |
| (!(config->flags & CONFIG_ADDR) || config->addr.s_addr == lease->addr.s_addr)) |
| lease_set_hostname(lease, config->hostname, 1, get_domain(lease->addr), NULL); |
| else if ((name = host_from_dns(lease->addr))) |
| lease_set_hostname(lease, name, 1, get_domain(lease->addr), NULL); /* updates auth flag only */ |
| } |
| |
| static void ourprintf(int *errp, char *format, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, format); |
| if (!(*errp) && vfprintf(daemon->lease_stream, format, ap) < 0) |
| *errp = errno; |
| va_end(ap); |
| } |
| |
| void lease_update_file(time_t now) |
| { |
| struct dhcp_lease *lease; |
| time_t next_event; |
| int i, err = 0; |
| |
| if (file_dirty != 0 && daemon->lease_stream) |
| { |
| errno = 0; |
| rewind(daemon->lease_stream); |
| if (errno != 0 || ftruncate(fileno(daemon->lease_stream), 0) != 0) |
| err = errno; |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| #endif |
| |
| #ifdef HAVE_BROKEN_RTC |
| ourprintf(&err, "%u ", lease->length); |
| #else |
| ourprintf(&err, "%lu ", (unsigned long)lease->expires); |
| #endif |
| |
| if (lease->hwaddr_type != ARPHRD_ETHER || lease->hwaddr_len == 0) |
| ourprintf(&err, "%.2x-", lease->hwaddr_type); |
| for (i = 0; i < lease->hwaddr_len; i++) |
| { |
| ourprintf(&err, "%.2x", lease->hwaddr[i]); |
| if (i != lease->hwaddr_len - 1) |
| ourprintf(&err, ":"); |
| } |
| |
| inet_ntop(AF_INET, &lease->addr, daemon->addrbuff, ADDRSTRLEN); |
| |
| ourprintf(&err, " %s ", daemon->addrbuff); |
| ourprintf(&err, "%s ", lease->hostname ? lease->hostname : "*"); |
| |
| if (lease->clid && lease->clid_len != 0) |
| { |
| for (i = 0; i < lease->clid_len - 1; i++) |
| ourprintf(&err, "%.2x:", lease->clid[i]); |
| ourprintf(&err, "%.2x\n", lease->clid[i]); |
| } |
| else |
| ourprintf(&err, "*\n"); |
| } |
| |
| #ifdef HAVE_DHCP6 |
| if (daemon->duid) |
| { |
| ourprintf(&err, "duid "); |
| for (i = 0; i < daemon->duid_len - 1; i++) |
| ourprintf(&err, "%.2x:", daemon->duid[i]); |
| ourprintf(&err, "%.2x\n", daemon->duid[i]); |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| |
| if (!(lease->flags & (LEASE_TA | LEASE_NA))) |
| continue; |
| |
| #ifdef HAVE_BROKEN_RTC |
| ourprintf(&err, "%u ", lease->length); |
| #else |
| ourprintf(&err, "%lu ", (unsigned long)lease->expires); |
| #endif |
| |
| inet_ntop(AF_INET6, &lease->addr6, daemon->addrbuff, ADDRSTRLEN); |
| |
| ourprintf(&err, "%s%u %s ", (lease->flags & LEASE_TA) ? "T" : "", |
| lease->iaid, daemon->addrbuff); |
| ourprintf(&err, "%s ", lease->hostname ? lease->hostname : "*"); |
| |
| if (lease->clid && lease->clid_len != 0) |
| { |
| for (i = 0; i < lease->clid_len - 1; i++) |
| ourprintf(&err, "%.2x:", lease->clid[i]); |
| ourprintf(&err, "%.2x\n", lease->clid[i]); |
| } |
| else |
| ourprintf(&err, "*\n"); |
| } |
| } |
| #endif |
| |
| if (fflush(daemon->lease_stream) != 0 || |
| fsync(fileno(daemon->lease_stream)) < 0) |
| err = errno; |
| |
| if (!err) |
| file_dirty = 0; |
| } |
| |
| /* Set alarm for when the first lease expires. */ |
| next_event = 0; |
| |
| #ifdef HAVE_DHCP6 |
| /* do timed RAs and determine when the next is, also pings to potential SLAAC addresses */ |
| if (daemon->doing_ra) |
| { |
| time_t event; |
| |
| if ((event = periodic_slaac(now, leases)) != 0) |
| { |
| if (next_event == 0 || difftime(next_event, event) > 0.0) |
| next_event = event; |
| } |
| |
| if ((event = periodic_ra(now)) != 0) |
| { |
| if (next_event == 0 || difftime(next_event, event) > 0.0) |
| next_event = event; |
| } |
| } |
| #endif |
| |
| for (lease = leases; lease; lease = lease->next) |
| if (lease->expires != 0 && |
| (next_event == 0 || difftime(next_event, lease->expires) > 0.0)) |
| next_event = lease->expires; |
| |
| if (err) |
| { |
| if (next_event == 0 || difftime(next_event, LEASE_RETRY + now) > 0.0) |
| next_event = LEASE_RETRY + now; |
| |
| my_syslog(MS_DHCP | LOG_ERR, _("failed to write %s: %s (retry in %us)"), |
| daemon->lease_file, strerror(err), |
| (unsigned int)difftime(next_event, now)); |
| } |
| |
| send_alarm(next_event, now); |
| } |
| |
| |
| static int find_interface_v4(struct in_addr local, int if_index, char *label, |
| struct in_addr netmask, struct in_addr broadcast, void *vparam) |
| { |
| struct dhcp_lease *lease; |
| int prefix = netmask_length(netmask); |
| |
| (void) label; |
| (void) broadcast; |
| (void) vparam; |
| |
| for (lease = leases; lease; lease = lease->next) |
| if (!(lease->flags & (LEASE_TA | LEASE_NA)) && |
| is_same_net(local, lease->addr, netmask) && |
| prefix > lease->new_prefixlen) |
| { |
| lease->new_interface = if_index; |
| lease->new_prefixlen = prefix; |
| } |
| |
| return 1; |
| } |
| |
| #ifdef HAVE_DHCP6 |
| static int find_interface_v6(struct in6_addr *local, int prefix, |
| int scope, int if_index, int flags, |
| int preferred, int valid, void *vparam) |
| { |
| struct dhcp_lease *lease; |
| |
| (void)scope; |
| (void)flags; |
| (void)preferred; |
| (void)valid; |
| (void)vparam; |
| |
| for (lease = leases; lease; lease = lease->next) |
| if ((lease->flags & (LEASE_TA | LEASE_NA))) |
| if (is_same_net6(local, &lease->addr6, prefix) && prefix > lease->new_prefixlen) { |
| /* save prefix length for comparison, as we might get shorter matching |
| * prefix in upcoming netlink GETADDR responses |
| * */ |
| lease->new_interface = if_index; |
| lease->new_prefixlen = prefix; |
| } |
| |
| return 1; |
| } |
| |
| void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface) |
| { |
| /* We may be doing RA but not DHCPv4, in which case the lease |
| database may not exist and we have nothing to do anyway */ |
| if (daemon->dhcp) |
| slaac_ping_reply(sender, packet, interface, leases); |
| } |
| |
| void lease_update_slaac(time_t now) |
| { |
| /* Called when we construct a new RA-names context, to add putative |
| new SLAAC addresses to existing leases. */ |
| |
| struct dhcp_lease *lease; |
| |
| if (daemon->dhcp) |
| for (lease = leases; lease; lease = lease->next) |
| slaac_add_addrs(lease, now, 0); |
| } |
| |
| #endif |
| |
| |
| /* Find interfaces associated with leases at start-up. This gets updated as |
| we do DHCP transactions, but information about directly-connected subnets |
| is useful from scrips and necessary for determining SLAAC addresses from |
| start-time. */ |
| void lease_find_interfaces(time_t now) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| lease->new_prefixlen = lease->new_interface = 0; |
| |
| iface_enumerate(AF_INET, &now, find_interface_v4); |
| #ifdef HAVE_DHCP6 |
| iface_enumerate(AF_INET6, &now, find_interface_v6); |
| #endif |
| |
| for (lease = leases; lease; lease = lease->next) |
| if (lease->new_interface != 0) |
| lease_set_interface(lease, lease->new_interface, now); |
| } |
| |
| #ifdef HAVE_DHCP6 |
| void lease_make_duid(time_t now) |
| { |
| /* If we're not doing DHCPv6, and there are not v6 leases, don't add the DUID to the database */ |
| if (!daemon->duid && daemon->doing_dhcp6) |
| { |
| file_dirty = 1; |
| make_duid(now); |
| } |
| } |
| #endif |
| |
| |
| |
| |
| void lease_update_dns(int force) |
| { |
| struct dhcp_lease *lease; |
| |
| if (daemon->port != 0 && (dns_dirty || force)) |
| { |
| #ifndef HAVE_BROKEN_RTC |
| /* force transfer to authoritative secondaries */ |
| daemon->soa_sn++; |
| #endif |
| |
| cache_unhash_dhcp(); |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| int prot = AF_INET; |
| |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| prot = AF_INET6; |
| else if (lease->hostname || lease->fqdn) |
| { |
| struct slaac_address *slaac; |
| |
| for (slaac = lease->slaac_address; slaac; slaac = slaac->next) |
| if (slaac->backoff == 0) |
| { |
| if (lease->fqdn) |
| cache_add_dhcp_entry(lease->fqdn, AF_INET6, (struct all_addr *)&slaac->addr, lease->expires); |
| if (!option_bool(OPT_DHCP_FQDN) && lease->hostname) |
| cache_add_dhcp_entry(lease->hostname, AF_INET6, (struct all_addr *)&slaac->addr, lease->expires); |
| } |
| } |
| |
| if (lease->fqdn) |
| cache_add_dhcp_entry(lease->fqdn, prot, |
| prot == AF_INET ? (struct all_addr *)&lease->addr : (struct all_addr *)&lease->addr6, |
| lease->expires); |
| |
| if (!option_bool(OPT_DHCP_FQDN) && lease->hostname) |
| cache_add_dhcp_entry(lease->hostname, prot, |
| prot == AF_INET ? (struct all_addr *)&lease->addr : (struct all_addr *)&lease->addr6, |
| lease->expires); |
| |
| #else |
| if (lease->fqdn) |
| cache_add_dhcp_entry(lease->fqdn, prot, (struct all_addr *)&lease->addr, lease->expires); |
| |
| if (!option_bool(OPT_DHCP_FQDN) && lease->hostname) |
| cache_add_dhcp_entry(lease->hostname, prot, (struct all_addr *)&lease->addr, lease->expires); |
| #endif |
| } |
| |
| dns_dirty = 0; |
| } |
| } |
| |
| void lease_prune(struct dhcp_lease *target, time_t now) |
| { |
| struct dhcp_lease *lease, *tmp, **up; |
| |
| for (lease = leases, up = &leases; lease; lease = tmp) |
| { |
| tmp = lease->next; |
| if ((lease->expires != 0 && difftime(now, lease->expires) > 0) || lease == target) |
| { |
| file_dirty = 1; |
| if (lease->hostname) |
| dns_dirty = 1; |
| |
| *up = lease->next; /* unlink */ |
| |
| /* Put on old_leases list 'till we |
| can run the script */ |
| lease->next = old_leases; |
| old_leases = lease; |
| |
| leases_left++; |
| } |
| else |
| up = &lease->next; |
| } |
| } |
| |
| |
| struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, |
| unsigned char *clid, int clid_len) |
| { |
| struct dhcp_lease *lease; |
| |
| if (clid) |
| for (lease = leases; lease; lease = lease->next) |
| { |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| #endif |
| if (lease->clid && clid_len == lease->clid_len && |
| memcmp(clid, lease->clid, clid_len) == 0) |
| return lease; |
| } |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| #endif |
| if ((!lease->clid || !clid) && |
| hw_len != 0 && |
| lease->hwaddr_len == hw_len && |
| lease->hwaddr_type == hw_type && |
| memcmp(hwaddr, lease->hwaddr, hw_len) == 0) |
| return lease; |
| } |
| |
| return NULL; |
| } |
| |
| struct dhcp_lease *lease_find_by_addr(struct in_addr addr) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| #endif |
| if (lease->addr.s_addr == addr.s_addr) |
| return lease; |
| } |
| |
| return NULL; |
| } |
| |
| #ifdef HAVE_DHCP6 |
| /* find address for {CLID, IAID, address} */ |
| struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len, |
| int lease_type, int iaid, struct in6_addr *addr) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| if (!(lease->flags & lease_type) || lease->iaid != iaid) |
| continue; |
| |
| if (!IN6_ARE_ADDR_EQUAL(&lease->addr6, addr)) |
| continue; |
| |
| if ((clid_len != lease->clid_len || |
| memcmp(clid, lease->clid, clid_len) != 0)) |
| continue; |
| |
| return lease; |
| } |
| |
| return NULL; |
| } |
| |
| /* reset "USED flags */ |
| void lease6_reset(void) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| lease->flags &= ~LEASE_USED; |
| } |
| |
| /* enumerate all leases belonging to {CLID, IAID} */ |
| struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type, unsigned char *clid, int clid_len, int iaid) |
| { |
| struct dhcp_lease *lease; |
| |
| if (!first) |
| first = leases; |
| else |
| first = first->next; |
| |
| for (lease = first; lease; lease = lease->next) |
| { |
| if (lease->flags & LEASE_USED) |
| continue; |
| |
| if (!(lease->flags & lease_type) || lease->iaid != iaid) |
| continue; |
| |
| if ((clid_len != lease->clid_len || |
| memcmp(clid, lease->clid, clid_len) != 0)) |
| continue; |
| |
| return lease; |
| } |
| |
| return NULL; |
| } |
| |
| struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| { |
| if (!(lease->flags & (LEASE_TA | LEASE_NA))) |
| continue; |
| |
| if (is_same_net6(&lease->addr6, net, prefix) && |
| (prefix == 128 || addr6part(&lease->addr6) == addr)) |
| return lease; |
| } |
| |
| return NULL; |
| } |
| |
| /* Find largest assigned address in context */ |
| u64 lease_find_max_addr6(struct dhcp_context *context) |
| { |
| struct dhcp_lease *lease; |
| u64 addr = addr6part(&context->start6); |
| |
| if (!(context->flags & (CONTEXT_STATIC | CONTEXT_PROXY))) |
| for (lease = leases; lease; lease = lease->next) |
| { |
| if (!(lease->flags & (LEASE_TA | LEASE_NA))) |
| continue; |
| |
| if (is_same_net6(&lease->addr6, &context->start6, 64) && |
| addr6part(&lease->addr6) > addr6part(&context->start6) && |
| addr6part(&lease->addr6) <= addr6part(&context->end6) && |
| addr6part(&lease->addr6) > addr) |
| addr = addr6part(&lease->addr6); |
| } |
| |
| return addr; |
| } |
| |
| #endif |
| |
| /* Find largest assigned address in context */ |
| struct in_addr lease_find_max_addr(struct dhcp_context *context) |
| { |
| struct dhcp_lease *lease; |
| struct in_addr addr = context->start; |
| |
| if (!(context->flags & (CONTEXT_STATIC | CONTEXT_PROXY))) |
| for (lease = leases; lease; lease = lease->next) |
| { |
| #ifdef HAVE_DHCP6 |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| #endif |
| if (((unsigned)ntohl(lease->addr.s_addr)) > ((unsigned)ntohl(context->start.s_addr)) && |
| ((unsigned)ntohl(lease->addr.s_addr)) <= ((unsigned)ntohl(context->end.s_addr)) && |
| ((unsigned)ntohl(lease->addr.s_addr)) > ((unsigned)ntohl(addr.s_addr))) |
| addr = lease->addr; |
| } |
| |
| return addr; |
| } |
| |
| static struct dhcp_lease *lease_allocate(void) |
| { |
| struct dhcp_lease *lease; |
| if (!leases_left || !(lease = whine_malloc(sizeof(struct dhcp_lease)))) |
| return NULL; |
| |
| memset(lease, 0, sizeof(struct dhcp_lease)); |
| lease->flags = LEASE_NEW; |
| lease->expires = 1; |
| #ifdef HAVE_BROKEN_RTC |
| lease->length = 0xffffffff; /* illegal value */ |
| #endif |
| lease->hwaddr_len = 256; /* illegal value */ |
| lease->next = leases; |
| leases = lease; |
| |
| file_dirty = 1; |
| leases_left--; |
| |
| return lease; |
| } |
| |
| struct dhcp_lease *lease4_allocate(struct in_addr addr) |
| { |
| struct dhcp_lease *lease = lease_allocate(); |
| if (lease) |
| lease->addr = addr; |
| |
| return lease; |
| } |
| |
| #ifdef HAVE_DHCP6 |
| struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type) |
| { |
| struct dhcp_lease *lease = lease_allocate(); |
| |
| if (lease) |
| { |
| lease->addr6 = *addrp; |
| lease->flags |= lease_type; |
| lease->iaid = 0; |
| } |
| |
| return lease; |
| } |
| #endif |
| |
| void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now) |
| { |
| time_t exp; |
| |
| if (len == 0xffffffff) |
| { |
| exp = 0; |
| len = 0; |
| } |
| else |
| { |
| exp = now + (time_t)len; |
| /* Check for 2038 overflow. Make the lease |
| infinite in that case, as the least disruptive |
| thing we can do. */ |
| if (difftime(exp, now) <= 0.0) |
| exp = 0; |
| } |
| |
| if (exp != lease->expires) |
| { |
| dns_dirty = 1; |
| lease->expires = exp; |
| #ifndef HAVE_BROKEN_RTC |
| lease->flags |= LEASE_AUX_CHANGED; |
| file_dirty = 1; |
| #endif |
| } |
| |
| #ifdef HAVE_BROKEN_RTC |
| if (len != lease->length) |
| { |
| lease->length = len; |
| lease->flags |= LEASE_AUX_CHANGED; |
| file_dirty = 1; |
| } |
| #endif |
| } |
| |
| #ifdef HAVE_DHCP6 |
| void lease_set_iaid(struct dhcp_lease *lease, int iaid) |
| { |
| if (lease->iaid != iaid) |
| { |
| lease->iaid = iaid; |
| lease->flags |= LEASE_CHANGED; |
| } |
| } |
| #endif |
| |
| void lease_set_hwaddr(struct dhcp_lease *lease, const unsigned char *hwaddr, |
| const unsigned char *clid, int hw_len, int hw_type, |
| int clid_len, time_t now, int force) |
| { |
| #ifdef HAVE_DHCP6 |
| int change = force; |
| lease->flags |= LEASE_HAVE_HWADDR; |
| #endif |
| |
| (void)force; |
| (void)now; |
| |
| if (hw_len != lease->hwaddr_len || |
| hw_type != lease->hwaddr_type || |
| (hw_len != 0 && memcmp(lease->hwaddr, hwaddr, hw_len) != 0)) |
| { |
| if (hw_len != 0) |
| memcpy(lease->hwaddr, hwaddr, hw_len); |
| lease->hwaddr_len = hw_len; |
| lease->hwaddr_type = hw_type; |
| lease->flags |= LEASE_CHANGED; |
| file_dirty = 1; /* run script on change */ |
| } |
| |
| /* only update clid when one is available, stops packets |
| without a clid removing the record. Lease init uses |
| clid_len == 0 for no clid. */ |
| if (clid_len != 0 && clid) |
| { |
| if (!lease->clid) |
| lease->clid_len = 0; |
| |
| if (lease->clid_len != clid_len) |
| { |
| lease->flags |= LEASE_AUX_CHANGED; |
| file_dirty = 1; |
| free(lease->clid); |
| if (!(lease->clid = whine_malloc(clid_len))) |
| return; |
| #ifdef HAVE_DHCP6 |
| change = 1; |
| #endif |
| } |
| else if (memcmp(lease->clid, clid, clid_len) != 0) |
| { |
| lease->flags |= LEASE_AUX_CHANGED; |
| file_dirty = 1; |
| #ifdef HAVE_DHCP6 |
| change = 1; |
| #endif |
| } |
| |
| lease->clid_len = clid_len; |
| memcpy(lease->clid, clid, clid_len); |
| } |
| |
| #ifdef HAVE_DHCP6 |
| if (change) |
| slaac_add_addrs(lease, now, force); |
| #endif |
| } |
| |
| static void kill_name(struct dhcp_lease *lease) |
| { |
| /* run script to say we lost our old name */ |
| |
| /* this shouldn't happen unless updates are very quick and the |
| script very slow, we just avoid a memory leak if it does. */ |
| free(lease->old_hostname); |
| |
| /* If we know the fqdn, pass that. The helper will derive the |
| unqualified name from it, free the unqualified name here. */ |
| |
| if (lease->fqdn) |
| { |
| lease->old_hostname = lease->fqdn; |
| free(lease->hostname); |
| } |
| else |
| lease->old_hostname = lease->hostname; |
| |
| lease->hostname = lease->fqdn = NULL; |
| } |
| |
| void lease_set_hostname(struct dhcp_lease *lease, const char *name, int auth, char *domain, char *config_domain) |
| { |
| struct dhcp_lease *lease_tmp; |
| char *new_name = NULL, *new_fqdn = NULL; |
| |
| 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, name); |
| |
| if (lease->hostname && name && hostname_isequal(lease->hostname, name)) |
| { |
| if (auth) |
| lease->flags |= LEASE_AUTH_NAME; |
| return; |
| } |
| |
| if (!name && !lease->hostname) |
| return; |
| |
| /* If a machine turns up on a new net without dropping the old lease, |
| or two machines claim the same name, then we end up with two interfaces with |
| the same name. Check for that here and remove the name from the old lease. |
| Note that IPv6 leases are different. All the leases to the same DUID are |
| allowed the same name. |
| |
| Don't allow a name from the client to override a name from dnsmasq config. */ |
| |
| if (name) |
| { |
| if ((new_name = whine_malloc(strlen(name) + 1))) |
| { |
| strcpy(new_name, name); |
| if (domain && (new_fqdn = whine_malloc(strlen(new_name) + strlen(domain) + 2))) |
| { |
| strcpy(new_fqdn, name); |
| strcat(new_fqdn, "."); |
| strcat(new_fqdn, domain); |
| } |
| } |
| |
| /* Depending on mode, we check either unqualified name or FQDN. */ |
| for (lease_tmp = leases; lease_tmp; lease_tmp = lease_tmp->next) |
| { |
| if (option_bool(OPT_DHCP_FQDN)) |
| { |
| if (!new_fqdn || !lease_tmp->fqdn || !hostname_isequal(lease_tmp->fqdn, new_fqdn)) |
| continue; |
| } |
| else |
| { |
| if (!new_name || !lease_tmp->hostname || !hostname_isequal(lease_tmp->hostname, new_name) ) |
| continue; |
| } |
| |
| if (lease->flags & (LEASE_TA | LEASE_NA)) |
| { |
| if (!(lease_tmp->flags & (LEASE_TA | LEASE_NA))) |
| continue; |
| |
| /* another lease for the same DUID is OK for IPv6 */ |
| if (lease->clid_len == lease_tmp->clid_len && |
| lease->clid && lease_tmp->clid && |
| memcmp(lease->clid, lease_tmp->clid, lease->clid_len) == 0) |
| continue; |
| } |
| else if (lease_tmp->flags & (LEASE_TA | LEASE_NA)) |
| continue; |
| |
| if ((lease_tmp->flags & LEASE_AUTH_NAME) && !auth) |
| { |
| free(new_name); |
| free(new_fqdn); |
| return; |
| } |
| |
| kill_name(lease_tmp); |
| break; |
| } |
| } |
| |
| if (lease->hostname) |
| kill_name(lease); |
| |
| lease->hostname = new_name; |
| lease->fqdn = new_fqdn; |
| |
| if (auth) |
| lease->flags |= LEASE_AUTH_NAME; |
| |
| file_dirty = 1; |
| dns_dirty = 1; |
| lease->flags |= LEASE_CHANGED; /* run script on change */ |
| } |
| |
| void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now) |
| { |
| (void)now; |
| |
| if (lease->last_interface == interface) |
| return; |
| |
| lease->last_interface = interface; |
| lease->flags |= LEASE_CHANGED; |
| |
| #ifdef HAVE_DHCP6 |
| slaac_add_addrs(lease, now, 0); |
| #endif |
| } |
| |
| void rerun_scripts(void) |
| { |
| struct dhcp_lease *lease; |
| |
| for (lease = leases; lease; lease = lease->next) |
| lease->flags |= LEASE_CHANGED; |
| } |
| |
| /* deleted leases get transferred to the old_leases list. |
| remove them here, after calling the lease change |
| script. Also run the lease change script on new/modified leases. |
| |
| Return zero if nothing to do. */ |
| int do_script_run(time_t now) |
| { |
| struct dhcp_lease *lease; |
| |
| (void)now; |
| |
| #ifdef HAVE_DBUS |
| /* If we're going to be sending DBus signals, but the connection is not yet up, |
| delay everything until it is. */ |
| if (option_bool(OPT_DBUS) && !daemon->dbus) |
| return 0; |
| #endif |
| |
| if (old_leases) |
| { |
| lease = old_leases; |
| |
| /* If the lease still has an old_hostname, do the "old" action on that first */ |
| if (lease->old_hostname) |
| { |
| #ifdef HAVE_SCRIPT |
| queue_script(ACTION_OLD_HOSTNAME, lease, lease->old_hostname, now); |
| #endif |
| free(lease->old_hostname); |
| lease->old_hostname = NULL; |
| return 1; |
| } |
| else |
| { |
| #ifdef HAVE_DHCP6 |
| struct slaac_address *slaac, *tmp; |
| for (slaac = lease->slaac_address; slaac; slaac = tmp) |
| { |
| tmp = slaac->next; |
| free(slaac); |
| } |
| #endif |
| kill_name(lease); |
| #ifdef HAVE_SCRIPT |
| queue_script(ACTION_DEL, lease, lease->old_hostname, now); |
| #endif |
| #ifdef HAVE_DBUS |
| emit_dbus_signal(ACTION_DEL, lease, lease->old_hostname); |
| #endif |
| old_leases = lease->next; |
| |
| free(lease->old_hostname); |
| free(lease->clid); |
| free(lease->extradata); |
| free(lease); |
| |
| return 1; |
| } |
| } |
| |
| /* make sure we announce the loss of a hostname before its new location. */ |
| for (lease = leases; lease; lease = lease->next) |
| if (lease->old_hostname) |
| { |
| #ifdef HAVE_SCRIPT |
| queue_script(ACTION_OLD_HOSTNAME, lease, lease->old_hostname, now); |
| #endif |
| free(lease->old_hostname); |
| lease->old_hostname = NULL; |
| return 1; |
| } |
| |
| for (lease = leases; lease; lease = lease->next) |
| if ((lease->flags & (LEASE_NEW | LEASE_CHANGED)) || |
| ((lease->flags & LEASE_AUX_CHANGED) && option_bool(OPT_LEASE_RO))) |
| { |
| #ifdef HAVE_SCRIPT |
| queue_script((lease->flags & LEASE_NEW) ? ACTION_ADD : ACTION_OLD, lease, |
| lease->fqdn ? lease->fqdn : lease->hostname, now); |
| #endif |
| #ifdef HAVE_DBUS |
| emit_dbus_signal((lease->flags & LEASE_NEW) ? ACTION_ADD : ACTION_OLD, lease, |
| lease->fqdn ? lease->fqdn : lease->hostname); |
| #endif |
| lease->flags &= ~(LEASE_NEW | LEASE_CHANGED | LEASE_AUX_CHANGED); |
| |
| /* this is used for the "add" call, then junked, since they're not in the database */ |
| free(lease->extradata); |
| lease->extradata = NULL; |
| |
| return 1; |
| } |
| |
| return 0; /* nothing to do */ |
| } |
| |
| #ifdef HAVE_SCRIPT |
| /* delim == -1 -> delim = 0, but embedded 0s, creating extra records, are OK. */ |
| void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data, unsigned int len, int delim) |
| { |
| unsigned int i; |
| |
| if (delim == -1) |
| delim = 0; |
| else |
| /* check for embedded NULLs */ |
| for (i = 0; i < len; i++) |
| if (data[i] == 0) |
| { |
| len = i; |
| break; |
| } |
| |
| if ((lease->extradata_size - lease->extradata_len) < (len + 1)) |
| { |
| size_t newsz = lease->extradata_len + len + 100; |
| unsigned char *new = whine_malloc(newsz); |
| |
| if (!new) |
| return; |
| |
| if (lease->extradata) |
| { |
| memcpy(new, lease->extradata, lease->extradata_len); |
| free(lease->extradata); |
| } |
| |
| lease->extradata = new; |
| lease->extradata_size = newsz; |
| } |
| |
| if (len != 0) |
| memcpy(lease->extradata + lease->extradata_len, data, len); |
| lease->extradata[lease->extradata_len + len] = delim; |
| lease->extradata_len += len + 1; |
| } |
| #endif |
| |
| #endif |
| |
| |
| |
| |