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sd-dhcp-lease.c
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sd-dhcp-lease.c
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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2013 Intel Corporation. All rights reserved.
***/
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdio_ext.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 "env-file.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 "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_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, 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.
*/
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) {
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_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);
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);
}
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 = strndup((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);
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_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;
route->option = SD_DHCP_OPTION_STATIC_ROUTE;
r = in4_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;
route->option = SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE;
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:
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->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)) {
log_debug_errno(r, "Timezone is not valid, ignoring: %m");
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_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 = TAKE_PTR(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 *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->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;
char sbuf[INET_ADDRSTRLEN];
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;
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
(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_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_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);