#include "list.h"
#include "mkdir.h"
#include "fileio.h"
+#include "unaligned.h"
+#include "in-addr-util.h"
#include "dhcp-protocol.h"
#include "dhcp-internal.h"
return 0;
}
+int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
+ assert_return(lease, -EINVAL);
+ assert_return(lease, -EINVAL);
+
+ *lifetime = lease->lifetime;
+
+ return 0;
+}
+
int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
assert_return(lease, -EINVAL);
assert_return(mtu, -EINVAL);
return 0;
}
-int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
+int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
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;
+ return lease->dns_size;
} else
return -ENOENT;
return 0;
}
-int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
+int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
assert_return(lease, -EINVAL);
assert_return(addr, -EINVAL);
- assert_return(addr_size, -EINVAL);
if (lease->ntp_size) {
- *addr_size = lease->ntp_size;
*addr = lease->ntp;
+ return lease->ntp_size;
} else
return -ENOENT;
return 0;
}
+int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, struct sd_dhcp_route **routes) {
+
+ assert_return(lease, -EINVAL);
+ assert_return(routes, -EINVAL);
+
+ if (lease->static_route_size) {
+ *routes = lease->static_route;
+ return lease->static_route_size;
+ } else
+ return -ENOENT;
+
+ return 0;
+}
+
sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
if (lease)
assert_se(REFCNT_INC(lease->n_ref) >= 2);
free(lease->domainname);
free(lease->dns);
free(lease->ntp);
+ free(lease->static_route);
free(lease);
}
}
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);
+ *ret = unaligned_read_be32((be32_t*) option);
if (*ret < min)
*ret = min;
}
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);
+ *ret = unaligned_read_be16((be16_t*) option);
if (*ret < min)
*ret = min;
return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2);
}
+static int class_prefixlen(uint8_t msb_octet, uint8_t *ret) {
+ if (msb_octet < 128)
+ /* Class A */
+ *ret = 8;
+ else if (msb_octet < 192)
+ /* Class B */
+ *ret = 16;
+ else if (msb_octet < 224)
+ /* Class C */
+ *ret = 24;
+ else
+ /* Class D or E -- no subnet mask */
+ return -ERANGE;
+
+ 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);
+ assert(routes);
+ assert(routes_size);
+ assert(routes_allocated);
+
+ if (!len)
+ 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;
+
+ if (class_prefixlen(*option, &route->dst_prefixlen) < 0) {
+ log_error("Failed to determine destination prefix length from class based IP, ignoring");
+ continue;
+ }
+
+ lease_parse_be32(option, 4, &addr.s_addr);
+ route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
+ option += 4;
+
+ lease_parse_be32(option, 4, &route->gw_addr.s_addr);
+ 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);
+ assert(routes);
+ assert(routes_size);
+ assert(routes_allocated);
+
+ /* 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;
+
+ lease_parse_be32(option, 4, &route->gw_addr.s_addr);
+ option += 4;
+ len -= 4;
+
+ (*routes_size)++;
+ }
+
+ return 0;
+}
+
int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
void *user_data) {
sd_dhcp_lease *lease = user_data;
break;
case DHCP_OPTION_STATIC_ROUTE:
- r = lease_parse_in_addrs_pairs(option, len, &lease->static_route, &lease->static_route_size);
+ r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size,
+ &lease->static_route_allocated);
if (r < 0)
return r;
break;
case DHCP_OPTION_DOMAIN_NAME:
- r = lease_parse_string(option, len, &lease->domainname);
+ {
+ _cleanup_free_ char *domainname = NULL;
+
+ r = lease_parse_string(option, len, &domainname);
if (r < 0)
return r;
- break;
+ if (!hostname_is_valid(domainname) || is_localhost(domainname))
+ break;
+ free(lease->domainname);
+ lease->domainname = domainname;
+ domainname = NULL;
+
+ break;
+ }
case DHCP_OPTION_HOST_NAME:
- r = lease_parse_string(option, len, &lease->hostname);
+ {
+ _cleanup_free_ char *hostname = NULL;
+
+ r = lease_parse_string(option, len, &hostname);
if (r < 0)
return r;
- break;
+ if (!hostname_is_valid(hostname) || is_localhost(hostname))
+ break;
+ free(lease->hostname);
+ lease->hostname = hostname;
+ hostname = NULL;
+
+ break;
+ }
case DHCP_OPTION_ROOT_PATH:
r = lease_parse_string(option, len, &lease->root_path);
if (r < 0)
lease_parse_bool(option, len, &lease->ip_forward_non_local);
break;
+
+ case 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)
+ return r;
+
+ break;
}
return 0;
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
struct in_addr address;
- struct in_addr *addresses;
- size_t addresses_size;
+ const struct in_addr *addresses;
const char *string;
uint16_t mtu;
+ struct sd_dhcp_route *routes;
int r;
assert(lease);
if (r >= 0)
fprintf(f, "MTU=%" PRIu16 "\n", mtu);
- r = sd_dhcp_lease_get_dns(lease, &addresses, &addresses_size);
+ fputs("DNS=", f);
+ r = sd_dhcp_lease_get_dns(lease, &addresses);
if (r >= 0)
- serialize_in_addrs(f, "DNS", addresses, addresses_size);
+ serialize_in_addrs(f, addresses, r);
+ fputs("\n", f);
- r = sd_dhcp_lease_get_ntp(lease, &addresses, &addresses_size);
+ fputs("NTP=", f);
+ r = sd_dhcp_lease_get_ntp(lease, &addresses);
if (r >= 0)
- serialize_in_addrs(f, "NTP", addresses, addresses_size);
+ serialize_in_addrs(f, addresses, r);
+ fputs("\n", f);
r = sd_dhcp_lease_get_domainname(lease, &string);
if (r >= 0)
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 = 0;
fflush(f);
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
_cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
*server_address = NULL, *next_server = NULL,
- *dns = NULL, *ntp = NULL, *mtu = NULL;
+ *dns = NULL, *ntp = NULL, *mtu = NULL, *routes = NULL;
struct in_addr addr;
int r;
"DOMAINNAME", &lease->domainname,
"HOSTNAME", &lease->hostname,
"ROOT_PATH", &lease->root_path,
+ "ROUTES", &routes,
NULL);
if (r < 0) {
if (r == -ENOENT)
}
if (dns) {
- r = deserialize_in_addrs(&lease->dns, &lease->dns_size, dns);
+ r = deserialize_in_addrs(&lease->dns, dns);
if (r < 0)
return r;
+
+ lease->dns_size = r;
}
if (ntp) {
- r = deserialize_in_addrs(&lease->ntp, &lease->ntp_size, dns);
+ r = deserialize_in_addrs(&lease->ntp, ntp);
if (r < 0)
return r;
+
+ lease->ntp_size = r;
}
if (mtu) {
lease->mtu = u;
}
+ if (routes) {
+ r = deserialize_dhcp_routes(&lease->static_route, &lease->static_route_size,
+ &lease->static_route_allocated, routes);
+ if (r < 0)
+ return r;
+ }
+
*ret = lease;
lease = NULL;
}
int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
- uint32_t address;
+ struct in_addr address;
+ struct in_addr mask;
+ int r;
assert(lease);
- assert(lease->address != INADDR_ANY);
- address = be32toh(lease->address);
+ 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;
- if ((address >> 31) == 0x0)
- /* class A, leading bits: 0 */
- lease->subnet_mask = htobe32(0xff000000);
- else if ((address >> 30) == 0x2)
- /* class B, leading bits 10 */
- lease->subnet_mask = htobe32(0xffff0000);
- else if ((address >> 29) == 0x6)
- /* class C, leading bits 110 */
- lease->subnet_mask = htobe32(0xffffff00);
- else
- /* class D or E, no default mask. give up */
- return -ERANGE;
+ lease->subnet_mask = mask.s_addr;
return 0;
}
~ianmdlvl / elogind.git / blobdiff