DHCP DUID and IAID configurability

1 files changed, 133 insertions, 0 deletions

diff --git a/src/network/networkd-conf.c b/src/network/networkd-conf.c
new file mode 100644
index 0000000000..4bc92b8171
--- /dev/null
+++ b/src/network/networkd-conf.c
@@ -0,0 +1,133 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Tom Gundersen <teg@jklm.no>
+
+  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 <ctype.h>
+
+#include "conf-parser.h"
+#include "def.h"
+#include "dhcp-identifier.h"
+#include "networkd-conf.h"
+#include "string-table.h"
+
+int manager_parse_config_file(Manager *m) {
+        assert(m);
+
+        return config_parse_many(PKGSYSCONFDIR "/networkd.conf",
+                                 CONF_PATHS_NULSTR("systemd/networkd.conf.d"),
+                                 "DUID\0",
+                                 config_item_perf_lookup, networkd_gperf_lookup,
+                                 false, m);
+}
+
+static const char* const dhcp_duid_type_table[_DHCP_DUID_TYPE_MAX] = {
+        [DHCP_DUID_TYPE_RAW]  = "raw",
+        [DHCP_DUID_TYPE_LLT]  = "link-layer-time",
+        [DHCP_DUID_TYPE_EN]   = "vendor",
+        [DHCP_DUID_TYPE_LL]   = "link-layer",
+        [DHCP_DUID_TYPE_UUID] = "uuid"
+};
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_duid_type, DHCPDUIDType);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_duid_type, dhcp_duid_type, DHCPDUIDType, "Failed to parse DHCP DUID type");
+
+int config_parse_dhcp_duid_raw(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        int r;
+        long byte;
+        char *cbyte, *pnext;
+        const char *pduid = (const char *)rvalue;
+        size_t count = 0, duid_len = 0;
+        Manager *m = userdata;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(m);
+        assert(m->dhcp_duid_type != _DHCP_DUID_TYPE_INVALID);
+
+        switch (m->dhcp_duid_type) {
+        case DHCP_DUID_TYPE_LLT:
+                /* RawData contains DUID-LLT link-layer address (offset 6) */
+                duid_len = 6;
+                break;
+        case DHCP_DUID_TYPE_EN:
+                /* RawData contains DUID-EN identifier (offset 4) */
+                duid_len = 4;
+                break;
+        case DHCP_DUID_TYPE_LL:
+                /* RawData contains DUID-LL link-layer address (offset 2) */
+                duid_len = 2;
+                break;
+        case DHCP_DUID_TYPE_UUID:
+                /* RawData specifies UUID (offset 0) - fall thru */
+        case DHCP_DUID_TYPE_RAW:
+                /* First two bytes of RawData is DUID Type - fall thru */
+        default:
+                break;
+        }
+
+        if (m->dhcp_duid_type != DHCP_DUID_TYPE_RAW)
+                m->dhcp_duid.type = htobe16(m->dhcp_duid_type);
+
+        /* RawData contains DUID in format " NN:NN:NN... " */
+        while (true) {
+                r = extract_first_word(&pduid, &cbyte, ":", 0);
+                if (r < 0) {
+                        log_error("Failed to read DUID.");
+                        return -EINVAL;
+                }
+                if (r == 0)
+                        break;
+                if (duid_len >= MAX_DUID_LEN) {
+                        log_error("DUID length exceeds maximum length.");
+                        return -EINVAL;
+                }
+
+                errno = 0;
+                byte = strtol(cbyte, &pnext, 16);
+                if ((errno == ERANGE && (byte == LONG_MAX || byte == LONG_MIN))
+                    || (errno != 0 && byte == 0) || (cbyte == pnext)) {
+                        log_error("Invalid DUID byte: %s.", cbyte);
+                        return -EINVAL; 
+                }
+
+                /* If DHCP_DUID_TYPE_RAW, first two bytes holds DUID Type */
+                if ((m->dhcp_duid_type == DHCP_DUID_TYPE_RAW) && (count < 2)) {
+                        m->dhcp_duid.type |= (byte << (8 * count));
+                        count++;
+                        continue;
+                }
+
+                m->dhcp_duid.raw.data[duid_len++] = byte;
+        }
+
+        m->dhcp_duid_len = sizeof(m->dhcp_duid.type) + duid_len;
+
+        return 0;
+}