/* SPDX-License-Identifier: LGPL-2.1-or-later */ /*** Copyright © 2013 Intel Corporation. All rights reserved. ***/ #include #include #include #include #include #include #include "sd-dhcp-lease.h" #include "alloc-util.h" #include "dhcp-lease-internal.h" #include "dhcp-protocol.h" #include "dns-domain.h" #include "env-file.h" #include "fd-util.h" #include "fileio.h" #include "fs-util.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 "strv.h" #include "tmpfile-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_servers( sd_dhcp_lease *lease, sd_dhcp_lease_server_type_t what, const struct in_addr **addr) { assert_return(lease, -EINVAL); assert_return(what >= 0, -EINVAL); assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL); if (lease->servers[what].size <= 0) return -ENODATA; if (addr) *addr = lease->servers[what].addr; return (int) lease->servers[what].size; } int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_DNS, addr); } int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_NTP, addr); } int sd_dhcp_lease_get_sip(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SIP, addr); } int sd_dhcp_lease_get_pop3(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_POP3, addr); } int sd_dhcp_lease_get_smtp(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SMTP, addr); } int sd_dhcp_lease_get_lpr(sd_dhcp_lease *lease, const struct in_addr **addr) { return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_LPR, addr); } 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, const struct in_addr **addr) { assert_return(lease, -EINVAL); assert_return(addr, -EINVAL); if (lease->router_size <= 0) return -ENODATA; *addr = lease->router; return (int) lease->router_size; } 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. */ static int dhcp_lease_get_routes(sd_dhcp_route *routes, size_t n_routes, sd_dhcp_route ***ret) { assert(routes || n_routes == 0); if (n_routes <= 0) return -ENODATA; if (ret) { sd_dhcp_route **buf; buf = new(sd_dhcp_route*, n_routes); if (!buf) return -ENOMEM; for (size_t i = 0; i < n_routes; i++) buf[i] = &routes[i]; *ret = buf; } return (int) n_routes; } int sd_dhcp_lease_get_static_routes(sd_dhcp_lease *lease, sd_dhcp_route ***ret) { assert_return(lease, -EINVAL); return dhcp_lease_get_routes(lease->static_routes, lease->n_static_routes, ret); } int sd_dhcp_lease_get_classless_routes(sd_dhcp_lease *lease, sd_dhcp_route ***ret) { assert_return(lease, -EINVAL); return dhcp_lease_get_routes(lease->classless_routes, lease->n_classless_routes, ret); } int sd_dhcp_lease_get_search_domains(sd_dhcp_lease *lease, char ***domains) { size_t 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_6rd( sd_dhcp_lease *lease, uint8_t *ret_ipv4masklen, uint8_t *ret_prefixlen, struct in6_addr *ret_prefix, const struct in_addr **ret_br_addresses, size_t *ret_n_br_addresses) { assert_return(lease, -EINVAL); if (lease->sixrd_n_br_addresses <= 0) return -ENODATA; if (ret_ipv4masklen) *ret_ipv4masklen = lease->sixrd_ipv4masklen; if (ret_prefixlen) *ret_prefixlen = lease->sixrd_prefixlen; if (ret_prefix) *ret_prefix = lease->sixrd_prefix; if (ret_br_addresses) *ret_br_addresses = lease->sixrd_br_addresses; if (ret_n_br_addresses) *ret_n_br_addresses = lease->sixrd_n_br_addresses; return 0; } 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; } static sd_dhcp_lease *dhcp_lease_free(sd_dhcp_lease *lease) { assert(lease); 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->root_path); free(lease->router); free(lease->timezone); free(lease->hostname); free(lease->domainname); for (sd_dhcp_lease_server_type_t i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++) free(lease->servers[i].addr); free(lease->static_routes); free(lease->classless_routes); free(lease->client_id); free(lease->vendor_specific); strv_free(lease->search_domains); free(lease->sixrd_br_addresses); return mfree(lease); } DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_lease, sd_dhcp_lease, dhcp_lease_free); 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 = memdup_suffix0((const char *) option, len); if (!string) return -ENOMEM; free_and_replace(*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, 0, &normalized); if (r < 0) return r; if (is_localhost(normalized)) return -EINVAL; if (dns_name_is_root(normalized)) return -EINVAL; free_and_replace(*ret, normalized); return 0; } static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) { assert(option || len == 0); 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; free(*ret); *ret = addresses; *n_ret = n_addresses; } return 0; } static int lease_parse_sip_server(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) { assert(option || len == 0); assert(ret); assert(n_ret); if (len <= 0) return -EINVAL; /* The SIP record is like the other, regular server records, but prefixed with a single "encoding" * byte that is either 0 or 1. We only support it to be 1 for now. Let's drop it and parse it like * the other fields */ if (option[0] != 1) { /* We only support IP address encoding for now */ *ret = mfree(*ret); *n_ret = 0; return 0; } return lease_parse_in_addrs(option + 1, len - 1, ret, n_ret); } static int lease_parse_static_routes(sd_dhcp_lease *lease, const uint8_t *option, size_t len) { int r; assert(lease); assert(option || len <= 0); if (len % 8 != 0) return -EINVAL; while (len >= 8) { struct in_addr dst, gw; uint8_t prefixlen; assert_se(lease_parse_be32(option, 4, &dst.s_addr) >= 0); option += 4; assert_se(lease_parse_be32(option, 4, &gw.s_addr) >= 0); option += 4; len -= 8; r = in4_addr_default_prefixlen(&dst, &prefixlen); if (r < 0) { log_debug("sd-dhcp-lease: cannot determine class of received static route, ignoring."); continue; } (void) in4_addr_mask(&dst, prefixlen); if (!GREEDY_REALLOC(lease->static_routes, lease->n_static_routes + 1)) return -ENOMEM; lease->static_routes[lease->n_static_routes++] = (struct sd_dhcp_route) { .dst_addr = dst, .gw_addr = gw, .dst_prefixlen = prefixlen, }; } return 0; } /* parses RFC3442 Classless Static Route Option */ static int lease_parse_classless_routes(sd_dhcp_lease *lease, const uint8_t *option, size_t len) { assert(lease); assert(option || len <= 0); /* option format: (subnet-mask-width significant-subnet-octets gateway-ip) */ while (len > 0) { uint8_t prefixlen, dst_octets; struct in_addr dst = {}, gw; prefixlen = *option; option++; len--; dst_octets = DIV_ROUND_UP(prefixlen, 8); /* can't have more than 4 octets in IPv4 */ if (dst_octets > 4 || len < dst_octets) return -EINVAL; memcpy(&dst, option, dst_octets); option += dst_octets; len -= dst_octets; if (len < 4) return -EINVAL; assert_se(lease_parse_be32(option, 4, &gw.s_addr) >= 0); option += 4; len -= 4; if (!GREEDY_REALLOC(lease->classless_routes, lease->n_classless_routes + 1)) return -ENOMEM; lease->classless_routes[lease->n_classless_routes++] = (struct sd_dhcp_route) { .dst_addr = dst, .gw_addr = gw, .dst_prefixlen = prefixlen, }; } return 0; } static int lease_parse_6rd(sd_dhcp_lease *lease, const uint8_t *option, size_t len) { uint8_t ipv4masklen, prefixlen; struct in6_addr prefix; _cleanup_free_ struct in_addr *br_addresses = NULL; size_t n_br_addresses; assert(lease); assert(option); /* See RFC 5969 Section 7.1.1 */ if (lease->sixrd_n_br_addresses > 0) /* Multiple 6rd option?? */ return -EINVAL; /* option-length: The length of the DHCP option in octets (22 octets with one BR IPv4 address). */ if (len < 2 + sizeof(struct in6_addr) + sizeof(struct in_addr) || (len - 2 - sizeof(struct in6_addr)) % sizeof(struct in_addr) != 0) return -EINVAL; /* IPv4MaskLen: The number of high-order bits that are identical across all CE IPv4 addresses * within a given 6rd domain. This may be any value between 0 and 32. Any value * greater than 32 is invalid. */ ipv4masklen = option[0]; if (ipv4masklen > 32) return -EINVAL; /* 6rdPrefixLen: The IPv6 prefix length of the SP's 6rd IPv6 prefix in number of bits. For the * purpose of bounds checking by DHCP option processing, the sum of * (32 - IPv4MaskLen) + 6rdPrefixLen MUST be less than or equal to 128. */ prefixlen = option[1]; if (32 - ipv4masklen + prefixlen > 128) return -EINVAL; /* 6rdPrefix: The service provider's 6rd IPv6 prefix represented as a 16-octet IPv6 address. * The bits in the prefix after the 6rdPrefixlen number of bits are reserved and * MUST be initialized to zero by the sender and ignored by the receiver. */ memcpy(&prefix, option + 2, sizeof(struct in6_addr)); (void) in6_addr_mask(&prefix, prefixlen); /* 6rdBRIPv4Address: One or more IPv4 addresses of the 6rd Border Relay(s) for a given 6rd domain. */ n_br_addresses = (len - 2 - sizeof(struct in6_addr)) / sizeof(struct in_addr); br_addresses = newdup(struct in_addr, option + 2 + sizeof(struct in6_addr), n_br_addresses); if (!br_addresses) return -ENOMEM; lease->sixrd_ipv4masklen = ipv4masklen; lease->sixrd_prefixlen = prefixlen; lease->sixrd_prefix = prefix; lease->sixrd_br_addresses = TAKE_PTR(br_addresses); lease->sixrd_n_br_addresses = n_br_addresses; 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: r = lease_parse_in_addrs(option, len, &lease->router, &lease->router_size); if (r < 0) log_debug_errno(r, "Failed to parse router addresses, ignoring: %m"); break; case SD_DHCP_OPTION_DOMAIN_NAME_SERVER: r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_DNS].addr, &lease->servers[SD_DHCP_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->servers[SD_DHCP_LEASE_NTP].addr, &lease->servers[SD_DHCP_LEASE_NTP].size); if (r < 0) log_debug_errno(r, "Failed to parse NTP server, ignoring: %m"); break; case SD_DHCP_OPTION_SIP_SERVER: r = lease_parse_sip_server(option, len, &lease->servers[SD_DHCP_LEASE_SIP].addr, &lease->servers[SD_DHCP_LEASE_SIP].size); if (r < 0) log_debug_errno(r, "Failed to parse SIP server, ignoring: %m"); break; case SD_DHCP_OPTION_POP3_SERVER: r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_POP3].addr, &lease->servers[SD_DHCP_LEASE_POP3].size); if (r < 0) log_debug_errno(r, "Failed to parse POP3 server, ignoring: %m"); break; case SD_DHCP_OPTION_SMTP_SERVER: r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_SMTP].addr, &lease->servers[SD_DHCP_LEASE_SMTP].size); if (r < 0) log_debug_errno(r, "Failed to parse SMTP server, ignoring: %m"); break; case SD_DHCP_OPTION_LPR_SERVER: r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_LPR].addr, &lease->servers[SD_DHCP_LEASE_LPR].size); if (r < 0) log_debug_errno(r, "Failed to parse LPR server, ignoring: %m"); break; case SD_DHCP_OPTION_STATIC_ROUTE: r = lease_parse_static_routes(lease, option, len); if (r < 0) log_debug_errno(r, "Failed to parse static routes, ignoring: %m"); break; case SD_DHCP_OPTION_MTU_INTERFACE: 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: 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 hostname, 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_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_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(lease, option, len); if (r < 0) log_debug_errno(r, "Failed to parse classless routes, ignoring: %m"); break; case SD_DHCP_OPTION_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)) { log_debug("Timezone is not valid, ignoring."); return 0; } free_and_replace(lease->timezone, tz); 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_6RD: r = lease_parse_6rd(lease, option, len); if (r < 0) log_debug_errno(r, "Failed to parse 6rd option, ignoring: %m"); 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; 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, 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 (FLAGS_SET(c, 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, 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; } strv_free_and_replace(*domains, names); 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 *option, *before = NULL; assert(lease); LIST_FOREACH(options, cur, lease->private_options) { if (tag < cur->tag) { before = cur; 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, before, 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->n_ref = 1; *ret = lease; return 0; } int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) { _cleanup_(unlink_and_freep) char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; struct in_addr address; const struct in_addr *addresses; const void *client_id, *data; size_t client_id_len, data_len; char sbuf[INET_ADDRSTRLEN]; const char *string; uint16_t mtu; _cleanup_free_ sd_dhcp_route **routes = NULL; char **search_domains; uint32_t t1, t2, lifetime; int r; assert(lease); assert(lease_file); r = fopen_temporary(lease_file, &f, &temp_path); if (r < 0) return r; (void) 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_ntop(AF_INET, &address, sbuf, sizeof(sbuf))); r = sd_dhcp_lease_get_netmask(lease, &address); if (r >= 0) fprintf(f, "NETMASK=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf))); r = sd_dhcp_lease_get_router(lease, &addresses); if (r > 0) { fputs("ROUTER=", f); serialize_in_addrs(f, addresses, r, false, NULL); fputc('\n', f); } r = sd_dhcp_lease_get_server_identifier(lease, &address); if (r >= 0) fprintf(f, "SERVER_ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf))); r = sd_dhcp_lease_get_next_server(lease, &address); if (r >= 0) fprintf(f, "NEXT_SERVER=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf))); r = sd_dhcp_lease_get_broadcast(lease, &address); if (r >= 0) fprintf(f, "BROADCAST=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf))); 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, false, NULL); fputc('\n', f); } r = sd_dhcp_lease_get_ntp(lease, &addresses); if (r > 0) { fputs("NTP=", f); serialize_in_addrs(f, addresses, r, false, NULL); fputc('\n', f); } r = sd_dhcp_lease_get_sip(lease, &addresses); if (r > 0) { fputs("SIP=", f); serialize_in_addrs(f, addresses, r, false, NULL); fputc('\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); fputc('\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_static_routes(lease, &routes); if (r > 0) serialize_dhcp_routes(f, "STATIC_ROUTES", routes, r); routes = mfree(routes); r = sd_dhcp_lease_get_classless_routes(lease, &routes); if (r > 0) serialize_dhcp_routes(f, "CLASSLESS_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) return -ENOMEM; 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) return -ENOMEM; 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) return r; } r = fflush_and_check(f); if (r < 0) return r; r = conservative_rename(temp_path, lease_file); if (r < 0) return r; temp_path = mfree(temp_path); return 0; } static char **private_options_free(char **options) { if (!options) return NULL; for (unsigned i = 0; i < SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1; i++) free(options[i]); return mfree(options); } DEFINE_TRIVIAL_CLEANUP_FUNC(char**, private_options_free); 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, *sip = NULL, *pop3 = NULL, *smtp = NULL, *lpr = NULL, *mtu = NULL, *static_routes = NULL, *classless_routes = NULL, *domains = NULL, *client_id_hex = NULL, *vendor_specific_hex = NULL, *lifetime = NULL, *t1 = NULL, *t2 = NULL; _cleanup_(private_options_freep) char **options = NULL; int r, i; assert(lease_file); assert(ret); r = dhcp_lease_new(&lease); if (r < 0) return r; options = new0(char*, SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1); if (!options) return -ENOMEM; r = parse_env_file(NULL, lease_file, "ADDRESS", &address, "ROUTER", &router, "NETMASK", &netmask, "SERVER_ADDRESS", &server_address, "NEXT_SERVER", &next_server, "BROADCAST", &broadcast, "DNS", &dns, "NTP", &ntp, "SIP", &sip, "POP3", &pop3, "SMTP", &smtp, "LPR", &lpr, "MTU", &mtu, "DOMAINNAME", &lease->domainname, "HOSTNAME", &lease->hostname, "DOMAIN_SEARCH_LIST", &domains, "ROOT_PATH", &lease->root_path, "STATIC_ROUTES", &static_routes, "CLASSLESS_ROUTES", &classless_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]); 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 = deserialize_in_addrs(&lease->router, router); if (r < 0) log_debug_errno(r, "Failed to deserialize router addresses %s, ignoring: %m", router); else lease->router_size = r; } 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->servers[SD_DHCP_LEASE_DNS].addr, dns); if (r < 0) log_debug_errno(r, "Failed to deserialize DNS servers %s, ignoring: %m", dns); else lease->servers[SD_DHCP_LEASE_DNS].size = r; } if (ntp) { r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_NTP].addr, ntp); if (r < 0) log_debug_errno(r, "Failed to deserialize NTP servers %s, ignoring: %m", ntp); else lease->servers[SD_DHCP_LEASE_NTP].size = r; } if (sip) { r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SIP].addr, sip); if (r < 0) log_debug_errno(r, "Failed to deserialize SIP servers %s, ignoring: %m", sip); else lease->servers[SD_DHCP_LEASE_SIP].size = r; } if (pop3) { r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_POP3].addr, pop3); if (r < 0) log_debug_errno(r, "Failed to deserialize POP3 server %s, ignoring: %m", pop3); else lease->servers[SD_DHCP_LEASE_POP3].size = r; } if (smtp) { r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SMTP].addr, smtp); if (r < 0) log_debug_errno(r, "Failed to deserialize SMTP server %s, ignoring: %m", smtp); else lease->servers[SD_DHCP_LEASE_SMTP].size = r; } if (lpr) { r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_LPR].addr, lpr); if (r < 0) log_debug_errno(r, "Failed to deserialize LPR server %s, ignoring: %m", lpr); else lease->servers[SD_DHCP_LEASE_LPR].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 = TAKE_PTR(a); } if (static_routes) { r = deserialize_dhcp_routes( &lease->static_routes, &lease->n_static_routes, static_routes); if (r < 0) log_debug_errno(r, "Failed to parse DHCP static routes %s, ignoring: %m", static_routes); } if (classless_routes) { r = deserialize_dhcp_routes( &lease->classless_routes, &lease->n_classless_routes, classless_routes); if (r < 0) log_debug_errno(r, "Failed to parse DHCP classless routes %s, ignoring: %m", classless_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 = unhexmem(client_id_hex, SIZE_MAX, &lease->client_id, &lease->client_id_len); if (r < 0) log_debug_errno(r, "Failed to parse client ID %s, ignoring: %m", client_id_hex); } if (vendor_specific_hex) { r = unhexmem(vendor_specific_hex, SIZE_MAX, &lease->vendor_specific, &lease->vendor_specific_len); 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 = unhexmem(options[i], SIZE_MAX, &data, &len); 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 = TAKE_PTR(lease); 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 = in4_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; }