diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-lease.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp-lease.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c new file mode 100644 index 000000000..0529b6d8f --- /dev/null +++ b/src/libsystemd-network/sd-dhcp-lease.c @@ -0,0 +1,401 @@ +/*** + 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 <stdlib.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <net/ethernet.h> +#include <arpa/inet.h> +#include <sys/param.h> + +#include "util.h" +#include "list.h" +#include "mkdir.h" +#include "fileio.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" +#include "dhcp-lease-internal.h" +#include "sd-dhcp-lease.h" +#include "sd-dhcp-client.h" + +int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + + addr->s_addr = lease->address; + + 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) + *mtu = lease->mtu; + else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + assert_return(addr_size, -EINVAL); + + if (lease->dns_size) { + *addr_size = lease->dns_size; + *addr = lease->dns; + } else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) { + assert_return(lease, -EINVAL); + assert_return(domainname, -EINVAL); + + if (lease->domainname) + *domainname = lease->domainname; + else + return -ENOENT; + + 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) + *hostname = lease->hostname; + else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + + 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); + + addr->s_addr = lease->subnet_mask; + + return 0; +} + +sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) { + if (lease) + assert_se(REFCNT_INC(lease->n_ref) >= 2); + + return lease; +} + +sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { + if (lease && REFCNT_DEC(lease->n_ref) <= 0) { + free(lease->hostname); + free(lease->domainname); + free(lease->dns); + free(lease); + } + + return NULL; +} + +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; + + switch(code) { + + case DHCP_OPTION_IP_ADDRESS_LEASE_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->lifetime = be32toh(val); + } + + break; + + case DHCP_OPTION_SERVER_IDENTIFIER: + if (len >= 4) + memcpy(&lease->server_address, option, 4); + + break; + + case DHCP_OPTION_SUBNET_MASK: + if (len >= 4) + memcpy(&lease->subnet_mask, option, 4); + + break; + + case DHCP_OPTION_ROUTER: + if (len >= 4) + memcpy(&lease->router, option, 4); + + break; + + case DHCP_OPTION_DOMAIN_NAME_SERVER: + if (len && !(len % 4)) { + unsigned i; + + lease->dns_size = len / 4; + + free(lease->dns); + lease->dns = new0(struct in_addr, lease->dns_size); + if (!lease->dns) + return -ENOMEM; + + for (i = 0; i < lease->dns_size; i++) { + memcpy(&lease->dns[i].s_addr, option + 4 * i, 4); + } + } + + break; + + case DHCP_OPTION_INTERFACE_MTU: + if (len >= 2) { + be16_t mtu; + + memcpy(&mtu, option, 2); + lease->mtu = be16toh(mtu); + + if (lease->mtu < 68) + lease->mtu = 0; + } + + break; + + case DHCP_OPTION_DOMAIN_NAME: + if (len >= 1) { + free(lease->domainname); + lease->domainname = strndup((const char *)option, len); + } + + break; + + case DHCP_OPTION_HOST_NAME: + if (len >= 1) { + free(lease->hostname); + lease->hostname = strndup((const char *)option, len); + } + + break; + + case DHCP_OPTION_RENEWAL_T1_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->t1 = be32toh(val); + } + + break; + + case DHCP_OPTION_REBINDING_T2_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->t2 = be32toh(val); + } + + break; + } + + return 0; +} + +int dhcp_lease_new(sd_dhcp_lease **ret) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + + lease = new0(sd_dhcp_lease, 1); + if (!lease) + return -ENOMEM; + + lease->n_ref = REFCNT_INIT; + + *ret = lease; + lease = NULL; + + 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; + char buf[INET_ADDRSTRLEN]; + struct in_addr address; + const char *string; + uint16_t mtu; + int r; + + assert(lease); + assert(lease_file); + + r = mkdir_safe_label("/run/systemd/network/leases", 0755, 0, 0); + if (r < 0) + goto finish; + + r = fopen_temporary(lease_file, &f, &temp_path); + if (r < 0) + goto finish; + + fchmod(fileno(f), 0644); + + r = sd_dhcp_lease_get_address(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "# This is private data. Do not parse.\n" + "ADDRESS=%s\n", string); + + r = sd_dhcp_lease_get_router(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "ROUTER=%s\n", string); + + r = sd_dhcp_lease_get_netmask(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "NETMASK=%s\n", string); + + r = sd_dhcp_lease_get_mtu(lease, &mtu); + if (r >= 0) + fprintf(f, "MTU=%" PRIu16 "\n", mtu); + +/* TODO: DNS. See resolv.conf writing in network-manager.c */ + + r = sd_dhcp_lease_get_domainname(lease, &string); + if (r >= 0) + fprintf(f, "DOMAINNAME=%s\n", string); + + r = sd_dhcp_lease_get_hostname(lease, &string); + if (r >= 0) + fprintf(f, "HOSTNAME=%s\n", string); + + r = 0; + + fflush(f); + + if (ferror(f) || rename(temp_path, lease_file) < 0) { + r = -errno; + unlink(lease_file); + unlink(temp_path); + } + +finish: + if (r < 0) + log_error("Failed to save lease data %s: %s", lease_file, strerror(-r)); + + return r; +} + +int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL, + *mtu = NULL; + struct in_addr addr; + int r; + + 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, + "MTU", &mtu, + "DOMAINNAME", &lease->domainname, + "HOSTNAME", &lease->hostname, + NULL); + if (r < 0) { + if (r == -ENOENT) + return 0; + + log_error("Failed to read %s: %s", lease_file, strerror(-r)); + return r; + } + + r = inet_pton(AF_INET, address, &addr); + if (r < 0) + return r; + + lease->address = addr.s_addr; + + r = inet_pton(AF_INET, router, &addr); + if (r < 0) + return r; + + lease->router = addr.s_addr; + + r = inet_pton(AF_INET, netmask, &addr); + if (r < 0) + return r; + + lease->subnet_mask = addr.s_addr; + + if (mtu) { + uint16_t u; + if (sscanf(mtu, "%" SCNu16, &u) > 0) + lease->mtu = u; + } + + *ret = lease; + lease = NULL; + + return 0; +} |