X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibsystemd-network%2Fsd-dhcp-lease.c;h=3203b7a592661d451650a859d1804b7583bebb3b;hb=ecde7065f7b11a7a226d2f7b0e90e998a6347a59;hp=4993fe3641f651cffd888283a0f7195c36ab9b46;hpb=09bee74d7a5f266b175baa19892fa84a9da51d7f;p=elogind.git diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c index 4993fe364..3203b7a59 100644 --- a/src/libsystemd-network/sd-dhcp-lease.c +++ b/src/libsystemd-network/sd-dhcp-lease.c @@ -174,119 +174,254 @@ sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { free(lease->hostname); free(lease->domainname); free(lease->dns); + free(lease->ntp); free(lease); } return NULL; } +static void lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) { + be32_t val; + + assert(option); + assert(ret); + + if (len == 4) { + memcpy(&val, option, 4); + *ret = be32toh(val); + + if (*ret < min) + *ret = min; + } +} + +static void lease_parse_s32(const uint8_t *option, size_t len, int32_t *ret) { + lease_parse_u32(option, len, (uint32_t *)ret, 0); +} + +static void lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) { + be16_t val; + + assert(option); + assert(ret); + + if (len == 2) { + memcpy(&val, option, 2); + *ret = be16toh(val); + + if (*ret < min) + *ret = min; + } +} + +static void lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) { + assert(option); + assert(ret); + + if (len == 4) + memcpy(ret, option, 4); +} + +static void lease_parse_bool(const uint8_t *option, size_t len, bool *ret) { + assert(option); + assert(ret); + + if (len == 1) + *ret = !!(*option); +} + +static void lease_parse_u8(const uint8_t *option, size_t len, uint8_t *ret, uint8_t min) { + assert(option); + assert(ret); + + if (len == 1) { + *ret = *option; + + if (*ret < min) + *ret = min; + } +} + +static int lease_parse_string(const uint8_t *option, size_t len, char **ret) { + assert(option); + assert(ret); + + if (len >= 1) { + char *string; + + string = strndup((const char *)option, len); + if (!string) + return -errno; + + free(*ret); + *ret = string; + } + + return 0; +} + +static int lease_parse_in_addrs_aux(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size, size_t mult) { + assert(option); + assert(ret); + assert(ret_size); + + if (len && !(len % (4 * mult))) { + size_t size; + struct in_addr *addresses; + + size = len / 4; + + addresses = newdup(struct in_addr, option, size); + if (!addresses) + return -ENOMEM; + + free(*ret); + *ret = addresses; + *ret_size = size; + } + + return 0; +} + +static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) { + return lease_parse_in_addrs_aux(option, len, ret, ret_size, 1); +} + +static int lease_parse_in_addrs_pairs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) { + return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2); +} + int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option, void *user_data) { sd_dhcp_lease *lease = user_data; - be32_t val; + int r; + + assert(lease); switch(code) { + case DHCP_OPTION_TIME_OFFSET: + lease_parse_s32(option, len, &lease->time_offset); + + break; + + case DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT: + lease_parse_u32(option, len, &lease->mtu_aging_timeout, 0); + + break; + case DHCP_OPTION_IP_ADDRESS_LEASE_TIME: - if (len == 4) { - memcpy(&val, option, 4); - lease->lifetime = be32toh(val); - } + lease_parse_u32(option, len, &lease->lifetime, 1); break; case DHCP_OPTION_SERVER_IDENTIFIER: - if (len >= 4) - memcpy(&lease->server_address, option, 4); + lease_parse_be32(option, len, &lease->server_address); break; case DHCP_OPTION_SUBNET_MASK: - if (len >= 4) - memcpy(&lease->subnet_mask, option, 4); + lease_parse_be32(option, len, &lease->subnet_mask); + + break; + + case DHCP_OPTION_BROADCAST: + lease_parse_be32(option, len, &lease->broadcast); break; case DHCP_OPTION_ROUTER: - if (len >= 4) - memcpy(&lease->router, option, 4); + lease_parse_be32(option, len, &lease->router); break; case DHCP_OPTION_DOMAIN_NAME_SERVER: - if (len && !(len % 4)) { - lease->dns_size = len / 4; - - free(lease->dns); - lease->dns = newdup(struct in_addr, option, lease->dns_size); - if (!lease->dns) - return -ENOMEM; - } + r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size); + if (r < 0) + return r; break; case DHCP_OPTION_NTP_SERVER: - if (len && !(len % 4)) { - lease->ntp_size = len / 4; + r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size); + if (r < 0) + return r; + + break; + + case DHCP_OPTION_POLICY_FILTER: + r = lease_parse_in_addrs_pairs(option, len, &lease->policy_filter, &lease->policy_filter_size); + if (r < 0) + return r; - free(lease->ntp); - lease->ntp = newdup(struct in_addr, option, lease->ntp_size); - if (!lease->ntp) - return -ENOMEM; - } + break; + + case DHCP_OPTION_STATIC_ROUTE: + r = lease_parse_in_addrs_pairs(option, len, &lease->static_route, &lease->static_route_size); + if (r < 0) + return r; break; case DHCP_OPTION_INTERFACE_MTU: - if (len >= 2) { - be16_t mtu; + lease_parse_u16(option, len, &lease->mtu, 68); - memcpy(&mtu, option, 2); - lease->mtu = be16toh(mtu); + break; + + case DHCP_OPTION_INTERFACE_MDR: + lease_parse_u16(option, len, &lease->mdr, 576); + + break; + + case DHCP_OPTION_INTERFACE_TTL: + lease_parse_u8(option, len, &lease->ttl, 1); + + break; - if (lease->mtu < 68) - lease->mtu = 0; - } + case DHCP_OPTION_BOOT_FILE_SIZE: + lease_parse_u16(option, len, &lease->boot_file_size, 0); break; case DHCP_OPTION_DOMAIN_NAME: - if (len >= 1) { - free(lease->domainname); - lease->domainname = strndup((const char *)option, len); - } + r = lease_parse_string(option, len, &lease->domainname); + if (r < 0) + return r; break; case DHCP_OPTION_HOST_NAME: - if (len >= 1) { - free(lease->hostname); - lease->hostname = strndup((const char *)option, len); - } + r = lease_parse_string(option, len, &lease->hostname); + if (r < 0) + return r; break; case DHCP_OPTION_ROOT_PATH: - if (len >= 1) { - free(lease->root_path); - lease->root_path = strndup((const char *)option, len); - } + r = lease_parse_string(option, len, &lease->root_path); + if (r < 0) + return r; break; case DHCP_OPTION_RENEWAL_T1_TIME: - if (len == 4) { - memcpy(&val, option, 4); - lease->t1 = be32toh(val); - } + lease_parse_u32(option, len, &lease->t1, 1); break; case DHCP_OPTION_REBINDING_T2_TIME: - if (len == 4) { - memcpy(&val, option, 4); - lease->t2 = be32toh(val); - } + lease_parse_u32(option, len, &lease->t2, 1); + + break; + + case DHCP_OPTION_ENABLE_IP_FORWARDING: + lease_parse_bool(option, len, &lease->ip_forward); + + break; + + case DHCP_OPTION_ENABLE_IP_FORWARDING_NL: + lease_parse_bool(option, len, &lease->ip_forward_non_local); break; }