| /*** |
| This file is part of systemd. |
| |
| Copyright (C) 2013 Intel Corporation. All rights reserved. |
| Copyright (C) 2014 Tom Gundersen |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "sd-dhcp-lease.h" |
| |
| #include "alloc-util.h" |
| #include "dhcp-lease-internal.h" |
| #include "dhcp-protocol.h" |
| #include "dns-domain.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "hexdecoct.h" |
| #include "hostname-util.h" |
| #include "in-addr-util.h" |
| #include "network-internal.h" |
| #include "parse-util.h" |
| #include "stdio-util.h" |
| #include "string-util.h" |
| #include "unaligned.h" |
| |
| int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->address == 0) |
| return -ENODATA; |
| |
| addr->s_addr = lease->address; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_broadcast(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (!lease->have_broadcast) |
| return -ENODATA; |
| |
| addr->s_addr = lease->broadcast; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) { |
| assert_return(lease, -EINVAL); |
| assert_return(lifetime, -EINVAL); |
| |
| if (lease->lifetime <= 0) |
| return -ENODATA; |
| |
| *lifetime = lease->lifetime; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_t1(sd_dhcp_lease *lease, uint32_t *t1) { |
| assert_return(lease, -EINVAL); |
| assert_return(t1, -EINVAL); |
| |
| if (lease->t1 <= 0) |
| return -ENODATA; |
| |
| *t1 = lease->t1; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_t2(sd_dhcp_lease *lease, uint32_t *t2) { |
| assert_return(lease, -EINVAL); |
| assert_return(t2, -EINVAL); |
| |
| if (lease->t2 <= 0) |
| return -ENODATA; |
| |
| *t2 = lease->t2; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) { |
| assert_return(lease, -EINVAL); |
| assert_return(mtu, -EINVAL); |
| |
| if (lease->mtu <= 0) |
| return -ENODATA; |
| |
| *mtu = lease->mtu; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->dns_size <= 0) |
| return -ENODATA; |
| |
| *addr = lease->dns; |
| return (int) lease->dns_size; |
| } |
| |
| int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->ntp_size <= 0) |
| return -ENODATA; |
| |
| *addr = lease->ntp; |
| return (int) lease->ntp_size; |
| } |
| |
| int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) { |
| assert_return(lease, -EINVAL); |
| assert_return(domainname, -EINVAL); |
| |
| if (!lease->domainname) |
| return -ENODATA; |
| |
| *domainname = lease->domainname; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) { |
| assert_return(lease, -EINVAL); |
| assert_return(hostname, -EINVAL); |
| |
| if (!lease->hostname) |
| return -ENODATA; |
| |
| *hostname = lease->hostname; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) { |
| assert_return(lease, -EINVAL); |
| assert_return(root_path, -EINVAL); |
| |
| if (!lease->root_path) |
| return -ENODATA; |
| |
| *root_path = lease->root_path; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->router == 0) |
| return -ENODATA; |
| |
| addr->s_addr = lease->router; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (!lease->have_subnet_mask) |
| return -ENODATA; |
| |
| addr->s_addr = lease->subnet_mask; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->server_address == 0) |
| return -ENODATA; |
| |
| addr->s_addr = lease->server_address; |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) { |
| assert_return(lease, -EINVAL); |
| assert_return(addr, -EINVAL); |
| |
| if (lease->next_server == 0) |
| return -ENODATA; |
| |
| addr->s_addr = lease->next_server; |
| return 0; |
| } |
| |
| /* |
| * The returned routes array must be freed by the caller. |
| * Route objects have the same lifetime of the lease and must not be freed. |
| */ |
| int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, sd_dhcp_route ***routes) { |
| sd_dhcp_route **ret; |
| unsigned i; |
| |
| assert_return(lease, -EINVAL); |
| assert_return(routes, -EINVAL); |
| |
| if (lease->static_route_size <= 0) |
| return -ENODATA; |
| |
| ret = new(sd_dhcp_route *, lease->static_route_size); |
| if (!ret) |
| return -ENOMEM; |
| |
| for (i = 0; i < lease->static_route_size; i++) |
| ret[i] = &lease->static_route[i]; |
| |
| *routes = ret; |
| return (int) lease->static_route_size; |
| } |
| |
| int sd_dhcp_lease_get_search_domains(sd_dhcp_lease *lease, char ***domains) { |
| unsigned r; |
| |
| assert_return(lease, -EINVAL); |
| assert_return(domains, -EINVAL); |
| |
| r = strv_length(lease->search_domains); |
| if (r > 0) { |
| *domains = lease->search_domains; |
| return (int) r; |
| } |
| |
| return -ENODATA; |
| } |
| |
| int sd_dhcp_lease_get_vendor_specific(sd_dhcp_lease *lease, const void **data, size_t *data_len) { |
| assert_return(lease, -EINVAL); |
| assert_return(data, -EINVAL); |
| assert_return(data_len, -EINVAL); |
| |
| if (lease->vendor_specific_len <= 0) |
| return -ENODATA; |
| |
| *data = lease->vendor_specific; |
| *data_len = lease->vendor_specific_len; |
| return 0; |
| } |
| |
| sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) { |
| |
| if (!lease) |
| return NULL; |
| |
| assert(lease->n_ref >= 1); |
| lease->n_ref++; |
| |
| return lease; |
| } |
| |
| sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { |
| |
| if (!lease) |
| return NULL; |
| |
| assert(lease->n_ref >= 1); |
| lease->n_ref--; |
| |
| if (lease->n_ref > 0) |
| return NULL; |
| |
| while (lease->private_options) { |
| struct sd_dhcp_raw_option *option = lease->private_options; |
| |
| LIST_REMOVE(options, lease->private_options, option); |
| |
| free(option->data); |
| free(option); |
| } |
| |
| free(lease->hostname); |
| free(lease->domainname); |
| free(lease->dns); |
| free(lease->ntp); |
| free(lease->static_route); |
| free(lease->client_id); |
| free(lease->vendor_specific); |
| strv_free(lease->search_domains); |
| return mfree(lease); |
| } |
| |
| static int lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) { |
| assert(option); |
| assert(ret); |
| |
| if (len != 4) |
| return -EINVAL; |
| |
| *ret = unaligned_read_be32((be32_t*) option); |
| if (*ret < min) |
| *ret = min; |
| |
| return 0; |
| } |
| |
| static int lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) { |
| assert(option); |
| assert(ret); |
| |
| if (len != 2) |
| return -EINVAL; |
| |
| *ret = unaligned_read_be16((be16_t*) option); |
| if (*ret < min) |
| *ret = min; |
| |
| return 0; |
| } |
| |
| static int lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) { |
| assert(option); |
| assert(ret); |
| |
| if (len != 4) |
| return -EINVAL; |
| |
| memcpy(ret, option, 4); |
| return 0; |
| } |
| |
| static int lease_parse_string(const uint8_t *option, size_t len, char **ret) { |
| assert(option); |
| assert(ret); |
| |
| if (len <= 0) |
| *ret = mfree(*ret); |
| else { |
| char *string; |
| |
| /* |
| * One trailing NUL byte is OK, we don't mind. See: |
| * https://github.com/systemd/systemd/issues/1337 |
| */ |
| if (memchr(option, 0, len - 1)) |
| return -EINVAL; |
| |
| string = strndup((const char *) option, len); |
| if (!string) |
| return -ENOMEM; |
| |
| free(*ret); |
| *ret = string; |
| } |
| |
| return 0; |
| } |
| |
| static int lease_parse_domain(const uint8_t *option, size_t len, char **ret) { |
| _cleanup_free_ char *name = NULL, *normalized = NULL; |
| int r; |
| |
| assert(option); |
| assert(ret); |
| |
| r = lease_parse_string(option, len, &name); |
| if (r < 0) |
| return r; |
| if (!name) { |
| *ret = mfree(*ret); |
| return 0; |
| } |
| |
| r = dns_name_normalize(name, &normalized); |
| if (r < 0) |
| return r; |
| |
| if (is_localhost(normalized)) |
| return -EINVAL; |
| |
| if (dns_name_is_root(normalized)) |
| return -EINVAL; |
| |
| free(*ret); |
| *ret = normalized; |
| normalized = NULL; |
| |
| return 0; |
| } |
| |
| static void filter_bogus_addresses(struct in_addr *addresses, size_t *n) { |
| size_t i, j; |
| |
| /* Silently filter DNS/NTP servers supplied to us that do not make outside of the local scope. */ |
| |
| for (i = 0, j = 0; i < *n; i ++) { |
| |
| if (in4_addr_is_null(addresses+i) || |
| in4_addr_is_localhost(addresses+i)) |
| continue; |
| |
| addresses[j++] = addresses[i]; |
| } |
| |
| *n = j; |
| } |
| |
| static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) { |
| assert(option); |
| assert(ret); |
| assert(n_ret); |
| |
| if (len <= 0) { |
| *ret = mfree(*ret); |
| *n_ret = 0; |
| } else { |
| size_t n_addresses; |
| struct in_addr *addresses; |
| |
| if (len % 4 != 0) |
| return -EINVAL; |
| |
| n_addresses = len / 4; |
| |
| addresses = newdup(struct in_addr, option, n_addresses); |
| if (!addresses) |
| return -ENOMEM; |
| |
| filter_bogus_addresses(addresses, &n_addresses); |
| |
| free(*ret); |
| *ret = addresses; |
| *n_ret = n_addresses; |
| } |
| |
| return 0; |
| } |
| |
| static int lease_parse_routes( |
| const uint8_t *option, size_t len, |
| struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) { |
| |
| struct in_addr addr; |
| |
| assert(option || len <= 0); |
| assert(routes); |
| assert(routes_size); |
| assert(routes_allocated); |
| |
| if (len <= 0) |
| return 0; |
| |
| if (len % 8 != 0) |
| return -EINVAL; |
| |
| if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8))) |
| return -ENOMEM; |
| |
| while (len >= 8) { |
| struct sd_dhcp_route *route = *routes + *routes_size; |
| int r; |
| |
| r = in_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen); |
| if (r < 0) { |
| log_debug("Failed to determine destination prefix length from class based IP, ignoring"); |
| continue; |
| } |
| |
| assert_se(lease_parse_be32(option, 4, &addr.s_addr) >= 0); |
| route->dst_addr = inet_makeaddr(inet_netof(addr), 0); |
| option += 4; |
| |
| assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0); |
| option += 4; |
| |
| len -= 8; |
| (*routes_size)++; |
| } |
| |
| return 0; |
| } |
| |
| /* parses RFC3442 Classless Static Route Option */ |
| static int lease_parse_classless_routes( |
| const uint8_t *option, size_t len, |
| struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) { |
| |
| assert(option || len <= 0); |
| assert(routes); |
| assert(routes_size); |
| assert(routes_allocated); |
| |
| if (len <= 0) |
| return 0; |
| |
| /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)* */ |
| |
| while (len > 0) { |
| uint8_t dst_octets; |
| struct sd_dhcp_route *route; |
| |
| if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1)) |
| return -ENOMEM; |
| |
| route = *routes + *routes_size; |
| |
| dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1); |
| route->dst_prefixlen = *option; |
| option++; |
| len--; |
| |
| /* can't have more than 4 octets in IPv4 */ |
| if (dst_octets > 4 || len < dst_octets) |
| return -EINVAL; |
| |
| route->dst_addr.s_addr = 0; |
| memcpy(&route->dst_addr.s_addr, option, dst_octets); |
| option += dst_octets; |
| len -= dst_octets; |
| |
| if (len < 4) |
| return -EINVAL; |
| |
| assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0); |
| option += 4; |
| len -= 4; |
| |
| (*routes_size)++; |
| } |
| |
| return 0; |
| } |
| |
| int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void *userdata) { |
| sd_dhcp_lease *lease = userdata; |
| int r; |
| |
| assert(lease); |
| |
| switch(code) { |
| |
| case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
| r = lease_parse_u32(option, len, &lease->lifetime, 1); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse lease time, ignoring: %m"); |
| |
| break; |
| |
| case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
| r = lease_parse_be32(option, len, &lease->server_address); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse server identifier, ignoring: %m"); |
| |
| break; |
| |
| case SD_DHCP_OPTION_SUBNET_MASK: |
| r = lease_parse_be32(option, len, &lease->subnet_mask); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse subnet mask, ignoring: %m"); |
| else |
| lease->have_subnet_mask = true; |
| break; |
| |
| case SD_DHCP_OPTION_BROADCAST: |
| r = lease_parse_be32(option, len, &lease->broadcast); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse broadcast address, ignoring: %m"); |
| else |
| lease->have_broadcast = true; |
| break; |
| |
| case SD_DHCP_OPTION_ROUTER: |
| if (len >= 4) { |
| r = lease_parse_be32(option, 4, &lease->router); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse router address, ignoring: %m"); |
| } |
| break; |
| |
| case SD_DHCP_OPTION_DOMAIN_NAME_SERVER: |
| r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse DNS server, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_NTP_SERVER: |
| r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse NTP server, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_STATIC_ROUTE: |
| r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size, &lease->static_route_allocated); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse static routes, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_INTERFACE_MTU: |
| r = lease_parse_u16(option, len, &lease->mtu, 68); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse MTU, ignoring: %m"); |
| if (lease->mtu < DHCP_DEFAULT_MIN_SIZE) { |
| log_debug("MTU value of %" PRIu16 " too small. Using default MTU value of %d instead.", lease->mtu, DHCP_DEFAULT_MIN_SIZE); |
| lease->mtu = DHCP_DEFAULT_MIN_SIZE; |
| } |
| |
| break; |
| |
| case SD_DHCP_OPTION_DOMAIN_NAME: |
| r = lease_parse_domain(option, len, &lease->domainname); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to parse domain name, ignoring: %m"); |
| return 0; |
| } |
| |
| break; |
| |
| case SD_DHCP_OPTION_DOMAIN_SEARCH_LIST: |
| r = dhcp_lease_parse_search_domains(option, len, &lease->search_domains); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse Domain Search List, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_HOST_NAME: |
| r = lease_parse_domain(option, len, &lease->hostname); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to parse host name, ignoring: %m"); |
| return 0; |
| } |
| |
| break; |
| |
| case SD_DHCP_OPTION_ROOT_PATH: |
| r = lease_parse_string(option, len, &lease->root_path); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse root path, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_RENEWAL_T1_TIME: |
| r = lease_parse_u32(option, len, &lease->t1, 1); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse T1 time, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_REBINDING_T2_TIME: |
| r = lease_parse_u32(option, len, &lease->t2, 1); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse T2 time, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE: |
| r = lease_parse_classless_routes( |
| option, len, |
| &lease->static_route, |
| &lease->static_route_size, |
| &lease->static_route_allocated); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse classless routes, ignoring: %m"); |
| break; |
| |
| case SD_DHCP_OPTION_NEW_TZDB_TIMEZONE: { |
| _cleanup_free_ char *tz = NULL; |
| |
| r = lease_parse_string(option, len, &tz); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to parse timezone option, ignoring: %m"); |
| return 0; |
| } |
| |
| if (!timezone_is_valid(tz)) { |
| log_debug_errno(r, "Timezone is not valid, ignoring: %m"); |
| return 0; |
| } |
| |
| free(lease->timezone); |
| lease->timezone = tz; |
| tz = NULL; |
| |
| break; |
| } |
| |
| case SD_DHCP_OPTION_VENDOR_SPECIFIC: |
| |
| if (len <= 0) |
| lease->vendor_specific = mfree(lease->vendor_specific); |
| else { |
| void *p; |
| |
| p = memdup(option, len); |
| if (!p) |
| return -ENOMEM; |
| |
| free(lease->vendor_specific); |
| lease->vendor_specific = p; |
| } |
| |
| lease->vendor_specific_len = len; |
| break; |
| |
| case SD_DHCP_OPTION_PRIVATE_BASE ... SD_DHCP_OPTION_PRIVATE_LAST: |
| r = dhcp_lease_insert_private_option(lease, code, option, len); |
| if (r < 0) |
| return r; |
| |
| break; |
| |
| default: |
| log_debug("Ignoring option DHCP option %"PRIu8" while parsing.", code); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /* Parses compressed domain names. */ |
| int dhcp_lease_parse_search_domains(const uint8_t *option, size_t len, char ***domains) { |
| _cleanup_strv_free_ char **names = NULL; |
| size_t pos = 0, cnt = 0; |
| int r; |
| |
| assert(domains); |
| assert_return(option && len > 0, -ENODATA); |
| |
| while (pos < len) { |
| _cleanup_free_ char *name = NULL; |
| size_t n = 0, allocated = 0; |
| size_t jump_barrier = pos, next_chunk = 0; |
| bool first = true; |
| |
| for (;;) { |
| uint8_t c; |
| c = option[pos++]; |
| |
| if (c == 0) { |
| /* End of name */ |
| break; |
| } else if (c <= 63) { |
| const char *label; |
| |
| /* Literal label */ |
| label = (const char*) (option + pos); |
| pos += c; |
| if (pos >= len) |
| return -EBADMSG; |
| |
| if (!GREEDY_REALLOC(name, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) |
| return -ENOMEM; |
| |
| if (first) |
| first = false; |
| else |
| name[n++] = '.'; |
| |
| r = dns_label_escape(label, c, name + n, DNS_LABEL_ESCAPED_MAX); |
| if (r < 0) |
| return r; |
| |
| n += r; |
| } else if ((c & 0xc0) == 0xc0) { |
| /* Pointer */ |
| |
| uint8_t d; |
| uint16_t ptr; |
| |
| if (pos >= len) |
| return -EBADMSG; |
| |
| d = option[pos++]; |
| ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d; |
| |
| /* Jumps are limited to a "prior occurrence" (RFC-1035 4.1.4) */ |
| if (ptr >= jump_barrier) |
| return -EBADMSG; |
| jump_barrier = ptr; |
| |
| /* Save current location so we don't end up re-parsing what's parsed so far. */ |
| if (next_chunk == 0) |
| next_chunk = pos; |
| |
| pos = ptr; |
| } else |
| return -EBADMSG; |
| } |
| |
| if (!GREEDY_REALLOC(name, allocated, n + 1)) |
| return -ENOMEM; |
| name[n] = 0; |
| |
| r = strv_extend(&names, name); |
| if (r < 0) |
| return r; |
| |
| cnt++; |
| |
| if (next_chunk != 0) |
| pos = next_chunk; |
| } |
| |
| *domains = names; |
| names = NULL; |
| |
| return cnt; |
| } |
| |
| int dhcp_lease_insert_private_option(sd_dhcp_lease *lease, uint8_t tag, const void *data, uint8_t len) { |
| struct sd_dhcp_raw_option *cur, *option; |
| |
| assert(lease); |
| |
| LIST_FOREACH(options, cur, lease->private_options) { |
| if (tag < cur->tag) |
| break; |
| if (tag == cur->tag) { |
| log_debug("Ignoring duplicate option, tagged %i.", tag); |
| return 0; |
| } |
| } |
| |
| option = new(struct sd_dhcp_raw_option, 1); |
| if (!option) |
| return -ENOMEM; |
| |
| option->tag = tag; |
| option->length = len; |
| option->data = memdup(data, len); |
| if (!option->data) { |
| free(option); |
| return -ENOMEM; |
| } |
| |
| LIST_INSERT_BEFORE(options, lease->private_options, cur, option); |
| return 0; |
| } |
| |
| int dhcp_lease_new(sd_dhcp_lease **ret) { |
| sd_dhcp_lease *lease; |
| |
| lease = new0(sd_dhcp_lease, 1); |
| if (!lease) |
| return -ENOMEM; |
| |
| lease->router = INADDR_ANY; |
| lease->n_ref = 1; |
| |
| *ret = lease; |
| return 0; |
| } |
| |
| int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) { |
| _cleanup_free_ char *temp_path = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| struct sd_dhcp_raw_option *option; |
| struct in_addr address; |
| const struct in_addr *addresses; |
| const void *client_id, *data; |
| size_t client_id_len, data_len; |
| const char *string; |
| uint16_t mtu; |
| _cleanup_free_ sd_dhcp_route **routes = NULL; |
| char **search_domains = NULL; |
| uint32_t t1, t2, lifetime; |
| int r; |
| |
| assert(lease); |
| assert(lease_file); |
| |
| r = fopen_temporary(lease_file, &f, &temp_path); |
| if (r < 0) |
| goto fail; |
| |
| fchmod(fileno(f), 0644); |
| |
| fprintf(f, |
| "# This is private data. Do not parse.\n"); |
| |
| r = sd_dhcp_lease_get_address(lease, &address); |
| if (r >= 0) |
| fprintf(f, "ADDRESS=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_netmask(lease, &address); |
| if (r >= 0) |
| fprintf(f, "NETMASK=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_router(lease, &address); |
| if (r >= 0) |
| fprintf(f, "ROUTER=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_server_identifier(lease, &address); |
| if (r >= 0) |
| fprintf(f, "SERVER_ADDRESS=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_next_server(lease, &address); |
| if (r >= 0) |
| fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_broadcast(lease, &address); |
| if (r >= 0) |
| fprintf(f, "BROADCAST=%s\n", inet_ntoa(address)); |
| |
| r = sd_dhcp_lease_get_mtu(lease, &mtu); |
| if (r >= 0) |
| fprintf(f, "MTU=%" PRIu16 "\n", mtu); |
| |
| r = sd_dhcp_lease_get_t1(lease, &t1); |
| if (r >= 0) |
| fprintf(f, "T1=%" PRIu32 "\n", t1); |
| |
| r = sd_dhcp_lease_get_t2(lease, &t2); |
| if (r >= 0) |
| fprintf(f, "T2=%" PRIu32 "\n", t2); |
| |
| r = sd_dhcp_lease_get_lifetime(lease, &lifetime); |
| if (r >= 0) |
| fprintf(f, "LIFETIME=%" PRIu32 "\n", lifetime); |
| |
| r = sd_dhcp_lease_get_dns(lease, &addresses); |
| if (r > 0) { |
| fputs("DNS=", f); |
| serialize_in_addrs(f, addresses, r); |
| fputs("\n", f); |
| } |
| |
| r = sd_dhcp_lease_get_ntp(lease, &addresses); |
| if (r > 0) { |
| fputs("NTP=", f); |
| serialize_in_addrs(f, addresses, r); |
| fputs("\n", f); |
| } |
| |
| r = sd_dhcp_lease_get_domainname(lease, &string); |
| if (r >= 0) |
| fprintf(f, "DOMAINNAME=%s\n", string); |
| |
| r = sd_dhcp_lease_get_search_domains(lease, &search_domains); |
| if (r > 0) { |
| fputs("DOMAIN_SEARCH_LIST=", f); |
| fputstrv(f, search_domains, NULL, NULL); |
| fputs("\n", f); |
| } |
| |
| r = sd_dhcp_lease_get_hostname(lease, &string); |
| if (r >= 0) |
| fprintf(f, "HOSTNAME=%s\n", string); |
| |
| r = sd_dhcp_lease_get_root_path(lease, &string); |
| if (r >= 0) |
| fprintf(f, "ROOT_PATH=%s\n", string); |
| |
| r = sd_dhcp_lease_get_routes(lease, &routes); |
| if (r > 0) |
| serialize_dhcp_routes(f, "ROUTES", routes, r); |
| |
| r = sd_dhcp_lease_get_timezone(lease, &string); |
| if (r >= 0) |
| fprintf(f, "TIMEZONE=%s\n", string); |
| |
| r = sd_dhcp_lease_get_client_id(lease, &client_id, &client_id_len); |
| if (r >= 0) { |
| _cleanup_free_ char *client_id_hex = NULL; |
| |
| client_id_hex = hexmem(client_id, client_id_len); |
| if (!client_id_hex) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| fprintf(f, "CLIENTID=%s\n", client_id_hex); |
| } |
| |
| r = sd_dhcp_lease_get_vendor_specific(lease, &data, &data_len); |
| if (r >= 0) { |
| _cleanup_free_ char *option_hex = NULL; |
| |
| option_hex = hexmem(data, data_len); |
| if (!option_hex) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| fprintf(f, "VENDOR_SPECIFIC=%s\n", option_hex); |
| } |
| |
| LIST_FOREACH(options, option, lease->private_options) { |
| char key[strlen("OPTION_000")+1]; |
| |
| xsprintf(key, "OPTION_%" PRIu8, option->tag); |
| r = serialize_dhcp_option(f, key, option->data, option->length); |
| if (r < 0) |
| goto fail; |
| } |
| |
| r = fflush_and_check(f); |
| if (r < 0) |
| goto fail; |
| |
| if (rename(temp_path, lease_file) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| if (temp_path) |
| (void) unlink(temp_path); |
| |
| return log_error_errno(r, "Failed to save lease data %s: %m", lease_file); |
| } |
| |
| int dhcp_lease_load(sd_dhcp_lease **ret, const char *lease_file) { |
| |
| _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
| _cleanup_free_ char |
| *address = NULL, |
| *router = NULL, |
| *netmask = NULL, |
| *server_address = NULL, |
| *next_server = NULL, |
| *broadcast = NULL, |
| *dns = NULL, |
| *ntp = NULL, |
| *mtu = NULL, |
| *routes = NULL, |
| *domains = NULL, |
| *client_id_hex = NULL, |
| *vendor_specific_hex = NULL, |
| *lifetime = NULL, |
| *t1 = NULL, |
| *t2 = NULL, |
| *options[SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1] = {}; |
| |
| int r, i; |
| |
| assert(lease_file); |
| assert(ret); |
| |
| r = dhcp_lease_new(&lease); |
| if (r < 0) |
| return r; |
| |
| r = parse_env_file(lease_file, NEWLINE, |
| "ADDRESS", &address, |
| "ROUTER", &router, |
| "NETMASK", &netmask, |
| "SERVER_IDENTIFIER", &server_address, |
| "NEXT_SERVER", &next_server, |
| "BROADCAST", &broadcast, |
| "DNS", &dns, |
| "NTP", &ntp, |
| "MTU", &mtu, |
| "DOMAINNAME", &lease->domainname, |
| "HOSTNAME", &lease->hostname, |
| "DOMAIN_SEARCH_LIST", &domains, |
| "ROOT_PATH", &lease->root_path, |
| "ROUTES", &routes, |
| "CLIENTID", &client_id_hex, |
| "TIMEZONE", &lease->timezone, |
| "VENDOR_SPECIFIC", &vendor_specific_hex, |
| "LIFETIME", &lifetime, |
| "T1", &t1, |
| "T2", &t2, |
| "OPTION_224", &options[0], |
| "OPTION_225", &options[1], |
| "OPTION_226", &options[2], |
| "OPTION_227", &options[3], |
| "OPTION_228", &options[4], |
| "OPTION_229", &options[5], |
| "OPTION_230", &options[6], |
| "OPTION_231", &options[7], |
| "OPTION_232", &options[8], |
| "OPTION_233", &options[9], |
| "OPTION_234", &options[10], |
| "OPTION_235", &options[11], |
| "OPTION_236", &options[12], |
| "OPTION_237", &options[13], |
| "OPTION_238", &options[14], |
| "OPTION_239", &options[15], |
| "OPTION_240", &options[16], |
| "OPTION_241", &options[17], |
| "OPTION_242", &options[18], |
| "OPTION_243", &options[19], |
| "OPTION_244", &options[20], |
| "OPTION_245", &options[21], |
| "OPTION_246", &options[22], |
| "OPTION_247", &options[23], |
| "OPTION_248", &options[24], |
| "OPTION_249", &options[25], |
| "OPTION_250", &options[26], |
| "OPTION_251", &options[27], |
| "OPTION_252", &options[28], |
| "OPTION_253", &options[29], |
| "OPTION_254", &options[30], |
| NULL); |
| if (r < 0) |
| return r; |
| |
| if (address) { |
| r = inet_pton(AF_INET, address, &lease->address); |
| if (r <= 0) |
| log_debug("Failed to parse address %s, ignoring.", address); |
| } |
| |
| if (router) { |
| r = inet_pton(AF_INET, router, &lease->router); |
| if (r <= 0) |
| log_debug("Failed to parse router %s, ignoring.", router); |
| } |
| |
| if (netmask) { |
| r = inet_pton(AF_INET, netmask, &lease->subnet_mask); |
| if (r <= 0) |
| log_debug("Failed to parse netmask %s, ignoring.", netmask); |
| else |
| lease->have_subnet_mask = true; |
| } |
| |
| if (server_address) { |
| r = inet_pton(AF_INET, server_address, &lease->server_address); |
| if (r <= 0) |
| log_debug("Failed to parse server address %s, ignoring.", server_address); |
| } |
| |
| if (next_server) { |
| r = inet_pton(AF_INET, next_server, &lease->next_server); |
| if (r <= 0) |
| log_debug("Failed to parse next server %s, ignoring.", next_server); |
| } |
| |
| if (broadcast) { |
| r = inet_pton(AF_INET, broadcast, &lease->broadcast); |
| if (r <= 0) |
| log_debug("Failed to parse broadcast address %s, ignoring.", broadcast); |
| else |
| lease->have_broadcast = true; |
| } |
| |
| if (dns) { |
| r = deserialize_in_addrs(&lease->dns, dns); |
| if (r < 0) |
| log_debug_errno(r, "Failed to deserialize DNS servers %s, ignoring: %m", dns); |
| else |
| lease->dns_size = r; |
| } |
| |
| if (ntp) { |
| r = deserialize_in_addrs(&lease->ntp, ntp); |
| if (r < 0) |
| log_debug_errno(r, "Failed to deserialize NTP servers %s, ignoring: %m", ntp); |
| else |
| lease->ntp_size = r; |
| } |
| |
| if (mtu) { |
| r = safe_atou16(mtu, &lease->mtu); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse MTU %s, ignoring: %m", mtu); |
| } |
| |
| if (domains) { |
| _cleanup_strv_free_ char **a = NULL; |
| a = strv_split(domains, " "); |
| if (!a) |
| return -ENOMEM; |
| |
| if (!strv_isempty(a)) { |
| lease->search_domains = a; |
| a = NULL; |
| } |
| } |
| |
| if (routes) { |
| r = deserialize_dhcp_routes( |
| &lease->static_route, |
| &lease->static_route_size, |
| &lease->static_route_allocated, |
| routes); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse DHCP routes %s, ignoring: %m", routes); |
| } |
| |
| if (lifetime) { |
| r = safe_atou32(lifetime, &lease->lifetime); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse lifetime %s, ignoring: %m", lifetime); |
| } |
| |
| if (t1) { |
| r = safe_atou32(t1, &lease->t1); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse T1 %s, ignoring: %m", t1); |
| } |
| |
| if (t2) { |
| r = safe_atou32(t2, &lease->t2); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse T2 %s, ignoring: %m", t2); |
| } |
| |
| if (client_id_hex) { |
| r = deserialize_dhcp_option(&lease->client_id, &lease->client_id_len, client_id_hex); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse client ID %s, ignoring: %m", client_id_hex); |
| } |
| |
| if (vendor_specific_hex) { |
| r = deserialize_dhcp_option(&lease->vendor_specific, &lease->vendor_specific_len, vendor_specific_hex); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse vendor specific data %s, ignoring: %m", vendor_specific_hex); |
| } |
| |
| for (i = 0; i <= SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE; i++) { |
| _cleanup_free_ void *data = NULL; |
| size_t len; |
| |
| if (!options[i]) |
| continue; |
| |
| r = deserialize_dhcp_option(&data, &len, options[i]); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to parse private DHCP option %s, ignoring: %m", options[i]); |
| continue; |
| } |
| |
| r = dhcp_lease_insert_private_option(lease, SD_DHCP_OPTION_PRIVATE_BASE + i, data, len); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = lease; |
| lease = NULL; |
| |
| return 0; |
| } |
| |
| int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) { |
| struct in_addr address, mask; |
| int r; |
| |
| assert(lease); |
| |
| if (lease->address == 0) |
| return -ENODATA; |
| |
| address.s_addr = lease->address; |
| |
| /* fall back to the default subnet masks based on address class */ |
| r = in_addr_default_subnet_mask(&address, &mask); |
| if (r < 0) |
| return r; |
| |
| lease->subnet_mask = mask.s_addr; |
| lease->have_subnet_mask = true; |
| |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_client_id(sd_dhcp_lease *lease, const void **client_id, size_t *client_id_len) { |
| assert_return(lease, -EINVAL); |
| assert_return(client_id, -EINVAL); |
| assert_return(client_id_len, -EINVAL); |
| |
| if (!lease->client_id) |
| return -ENODATA; |
| |
| *client_id = lease->client_id; |
| *client_id_len = lease->client_id_len; |
| |
| return 0; |
| } |
| |
| int dhcp_lease_set_client_id(sd_dhcp_lease *lease, const void *client_id, size_t client_id_len) { |
| assert_return(lease, -EINVAL); |
| assert_return(client_id || client_id_len <= 0, -EINVAL); |
| |
| if (client_id_len <= 0) |
| lease->client_id = mfree(lease->client_id); |
| else { |
| void *p; |
| |
| p = memdup(client_id, client_id_len); |
| if (!p) |
| return -ENOMEM; |
| |
| free(lease->client_id); |
| lease->client_id = p; |
| lease->client_id_len = client_id_len; |
| } |
| |
| return 0; |
| } |
| |
| int sd_dhcp_lease_get_timezone(sd_dhcp_lease *lease, const char **tz) { |
| assert_return(lease, -EINVAL); |
| assert_return(tz, -EINVAL); |
| |
| if (!lease->timezone) |
| return -ENODATA; |
| |
| *tz = lease->timezone; |
| return 0; |
| } |
| |
| int sd_dhcp_route_get_destination(sd_dhcp_route *route, struct in_addr *destination) { |
| assert_return(route, -EINVAL); |
| assert_return(destination, -EINVAL); |
| |
| *destination = route->dst_addr; |
| return 0; |
| } |
| |
| int sd_dhcp_route_get_destination_prefix_length(sd_dhcp_route *route, uint8_t *length) { |
| assert_return(route, -EINVAL); |
| assert_return(length, -EINVAL); |
| |
| *length = route->dst_prefixlen; |
| return 0; |
| } |
| |
| int sd_dhcp_route_get_gateway(sd_dhcp_route *route, struct in_addr *gateway) { |
| assert_return(route, -EINVAL); |
| assert_return(gateway, -EINVAL); |
| |
| *gateway = route->gw_addr; |
| return 0; |
| } |