summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/sd-dhcp-lease.c
diff options
context:
space:
mode:
authorTom Gundersen <teg@jklm.no>2014-02-27 01:24:05 +0100
committerTom Gundersen <teg@jklm.no>2014-02-28 01:01:13 +0100
commitfe8db0c5ee3365a2fc80ee7ebffa238f9a0a2ae2 (patch)
tree51d408aaec8fa6acd19c51839cd50618c9a00321 /src/libsystemd-network/sd-dhcp-lease.c
parentc594cccee264cfd98f183ae6ec289b11e70f2d6c (diff)
sd-network: add new library
This is similar to sd-login, but exposes the state of networkd rather than logind. Include it in libsystemd-dhcp and rename it to libsystemd-network.
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-lease.c')
-rw-r--r--src/libsystemd-network/sd-dhcp-lease.c401
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 0000000000..0529b6d8fa
--- /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;
+}