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dhcp-message: introduce sd_dhcp_message object and several functions for the object
This commit is contained in:
Yu Watanabe
349
src/libsystemd-network/dhcp-message.c
Normal file
349
src/libsystemd-network/dhcp-message.c
Normal file
@@ -0,0 +1,349 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <net/if_arp.h>
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#include "alloc-util.h"
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#include "dhcp-message.h"
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#include "dhcp-protocol.h"
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#include "ether-addr-util.h"
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#include "iovec-util.h"
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#include "iovec-wrapper.h"
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#include "ip-util.h"
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static sd_dhcp_message* dhcp_message_free(sd_dhcp_message *message) {
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if (!message)
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return NULL;
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tlv_done(&message->options);
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return mfree(message);
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}
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DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_message, sd_dhcp_message, dhcp_message_free);
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int dhcp_message_new(sd_dhcp_message **ret) {
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assert(ret);
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sd_dhcp_message *message = new(sd_dhcp_message, 1);
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if (!message)
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return -ENOMEM;
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*message = (sd_dhcp_message) {
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.n_ref = 1,
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.options = TLV_INIT(TLV_DHCP4),
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};
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*ret = TAKE_PTR(message);
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return 0;
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}
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int dhcp_message_init_header(
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sd_dhcp_message *message,
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uint8_t op,
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uint32_t xid,
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uint16_t arp_type,
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const struct hw_addr_data *hw_addr) {
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assert(message);
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assert(IN_SET(op, BOOTREQUEST, BOOTREPLY));
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/* RFC 2131 section 4.1.1:
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* The client MUST include its hardware address in the ’chaddr’ field, if necessary for delivery of
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* DHCP reply messages.
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*
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* RFC 4390 section 2.1:
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* A DHCP client, when working over an IPoIB interface, MUST follow the following rules:
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* "htype" (hardware address type) MUST be 32 [ARPPARAM].
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* "hlen" (hardware address length) MUST be 0.
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* "chaddr" (client hardware address) field MUST be zeroed.
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*
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* Note, the maximum hardware address length (HW_ADDR_MAX_SIZE) is 32, but the size of the chaddr
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* field is 16.
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*
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* Also, ARP type is 2 bytes, but the htype field is 1 byte. */
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if (arp_type == ARPHRD_INFINIBAND)
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hw_addr = NULL;
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if (hw_addr && hw_addr->length > sizeof_field(DHCPMessageHeader, chaddr))
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return -EINVAL;
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message->header = (DHCPMessageHeader) {
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.op = op,
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.htype = arp_type <= UINT8_MAX ? arp_type : 0,
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.hlen = hw_addr ? hw_addr->length : 0,
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.xid = htobe32(xid),
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.magic = htobe32(DHCP_MAGIC_COOKIE),
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};
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if (hw_addr)
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memcpy_safe(message->header.chaddr, hw_addr->bytes, hw_addr->length);
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return 0;
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}
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void dhcp_message_set_broadcast_flag(sd_dhcp_message *message, bool b) {
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assert(message);
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SET_FLAG(message->header.flags, htobe16(0x8000), b);
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}
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bool dhcp_message_has_broadcast_flag(sd_dhcp_message *message) {
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assert(message);
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return FLAGS_SET(message->header.flags, htobe16(0x8000));
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}
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int dhcp_message_get_hw_addr(sd_dhcp_message *message, struct hw_addr_data *ret) {
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assert(message);
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assert(ret);
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if (message->header.hlen > sizeof_field(DHCPMessageHeader, chaddr))
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return -EBADMSG;
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ret->length = message->header.hlen;
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memcpy_safe(ret->bytes, message->header.chaddr, message->header.hlen);
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return 0;
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}
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bool dhcp_message_has_option(sd_dhcp_message *message, uint8_t code) {
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assert(message);
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return tlv_contains(&message->options, code);
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}
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void dhcp_message_remove_option(sd_dhcp_message *message, uint8_t code) {
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assert(message);
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tlv_remove(&message->options, code);
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}
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int dhcp_message_append_option(sd_dhcp_message *message, uint8_t code, size_t length, const void *data) {
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assert(message);
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return tlv_append(&message->options, code, length, data);
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}
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int dhcp_message_append_option_tlv(sd_dhcp_message *message, const TLV *tlv) {
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assert(message);
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return tlv_append_tlv(&message->options, tlv);
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}
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int dhcp_message_append_option_flag(sd_dhcp_message *message, uint8_t code) {
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assert(message);
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if (dhcp_message_has_option(message, code))
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return -EEXIST;
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return dhcp_message_append_option(message, code, /* length= */ 0, /* data= */ NULL);
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}
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int dhcp_message_append_option_u8(sd_dhcp_message *message, uint8_t code, uint8_t data) {
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assert(message);
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if (dhcp_message_has_option(message, code))
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return -EEXIST;
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return dhcp_message_append_option(message, code, sizeof(uint8_t), &data);
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}
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int dhcp_message_append_option_u16(sd_dhcp_message *message, uint8_t code, uint16_t data) {
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assert(message);
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if (dhcp_message_has_option(message, code))
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return -EEXIST;
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be16_t b = htobe16(data);
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return dhcp_message_append_option(message, code, sizeof(be16_t), &b);
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}
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int dhcp_message_append_option_be32(sd_dhcp_message *message, uint8_t code, be32_t data) {
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assert(message);
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if (dhcp_message_has_option(message, code))
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return -EEXIST;
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return dhcp_message_append_option(message, code, sizeof(be32_t), &data);
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}
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int dhcp_message_get_option(sd_dhcp_message *message, uint8_t code, size_t length, void *ret) {
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int r;
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assert(message);
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struct iovec iov;
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r = tlv_get_full(&message->options, code, length, ret ? &iov : NULL);
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if (r < 0)
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return r;
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if (ret)
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memcpy_safe(ret, iov.iov_base, iov.iov_len);
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return 0;
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}
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int dhcp_message_get_option_alloc(sd_dhcp_message *message, uint8_t code, struct iovec *ret) {
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assert(message);
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return tlv_get_alloc(&message->options, code, ret);
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}
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int dhcp_message_get_option_flag(sd_dhcp_message *message, uint8_t code) {
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assert(message);
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return dhcp_message_get_option(message, code, /* length= */ 0, /* ret= */ NULL);
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}
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int dhcp_message_get_option_u8(sd_dhcp_message *message, uint8_t code, uint8_t *ret) {
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assert(message);
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return dhcp_message_get_option(message, code, sizeof(uint8_t), ret);
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}
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int dhcp_message_get_option_u16(sd_dhcp_message *message, uint8_t code, uint16_t *ret) {
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be16_t b;
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int r;
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assert(message);
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r = dhcp_message_get_option(message, code, sizeof(be16_t), ret ? &b : NULL);
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if (r < 0)
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return r;
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if (ret)
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*ret = be16toh(b);
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return 0;
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}
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int dhcp_message_get_option_be32(sd_dhcp_message *message, uint8_t code, be32_t *ret) {
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assert(message);
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return dhcp_message_get_option(message, code, sizeof(be32_t), ret);
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}
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static int dhcp_message_verify_header(
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const struct iovec *iov,
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uint8_t op,
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const uint32_t *xid,
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uint16_t arp_type,
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const struct hw_addr_data *hw_addr) {
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assert(iov);
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assert(iovec_is_valid(iov));
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assert(IN_SET(op, 0, BOOTREQUEST, BOOTREPLY)); /* when 0, both BOOTREQUEST and BOOTREPLY are accepted */
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POINTER_MAY_BE_NULL(xid);
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POINTER_MAY_BE_NULL(hw_addr);
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if (iov->iov_len < sizeof(DHCPMessageHeader))
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return -EBADMSG;
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const DHCPMessageHeader *header = iov->iov_base;
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if (!IN_SET(header->op, BOOTREQUEST, BOOTREPLY))
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return -EBADMSG;
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if (op != 0 && header->op != op)
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return -EBADMSG;
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if (xid && be32toh(header->xid) != *xid)
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return -EBADMSG;
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if (arp_type <= UINT8_MAX && header->htype != arp_type)
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return -EBADMSG;
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if (header->hlen > sizeof_field(DHCPMessageHeader, chaddr))
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return -EBADMSG;
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if (hw_addr && memcmp_nn(header->chaddr, header->hlen, hw_addr->bytes, hw_addr->length) != 0)
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return -EBADMSG;
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return 0;
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}
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int dhcp_message_parse(
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const struct iovec *iov,
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uint8_t op,
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const uint32_t *xid,
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uint16_t arp_type,
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const struct hw_addr_data *hw_addr,
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sd_dhcp_message **ret) {
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int r;
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assert(iov);
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assert(ret);
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r = dhcp_message_verify_header(iov, op, xid, arp_type, hw_addr);
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if (r < 0)
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return r;
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_cleanup_(sd_dhcp_message_unrefp) sd_dhcp_message *message = NULL;
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r = dhcp_message_new(&message);
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if (r < 0)
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return r;
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memcpy(&message->header, iov->iov_base, sizeof(DHCPMessageHeader));
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if (be32toh(message->header.magic) != DHCP_MAGIC_COOKIE) {
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/* Should be BOOTP, and no options. */
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*ret = TAKE_PTR(message);
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return 0;
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}
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/* In the BOOTP protocol (RFC 951), the vendor field (magic + options) is 64 bytes, but here we do
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* not check the length, and support all DHCP options even if we are running as BOOTP client. */
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r = tlv_parse(&message->options, &IOVEC_SHIFT(iov, sizeof(DHCPMessageHeader)));
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if (r < 0)
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return r;
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/* Parse SD_DHCP_OPTION_OVERLOAD (52) to determine if we should parse sname and/or file. */
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uint8_t overload = DHCP_OVERLOAD_NONE;
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(void) dhcp_message_get_option_u8(message, SD_DHCP_OPTION_OVERLOAD, &overload);
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if (FLAGS_SET(overload, DHCP_OVERLOAD_FILE)) {
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r = tlv_parse(&message->options, &IOVEC_MAKE(message->header.file, sizeof(message->header.file)));
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if (r < 0)
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return r;
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}
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if (FLAGS_SET(overload, DHCP_OVERLOAD_SNAME)) {
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r = tlv_parse(&message->options, &IOVEC_MAKE(message->header.sname, sizeof(message->header.sname)));
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if (r < 0)
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return r;
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}
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*ret = TAKE_PTR(message);
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return 0;
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}
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int dhcp_message_build(sd_dhcp_message *message, struct iovec_wrapper *ret) {
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int r;
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assert(message);
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assert(ret);
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size_t size = size_add(sizeof(DHCPMessageHeader), tlv_size(&message->options));
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if (size > UDP_PAYLOAD_MAX_SIZE)
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return -E2BIG;
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_cleanup_(iovw_done_free) struct iovec_wrapper iovw = {};
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r = iovw_extend(&iovw, &message->header, sizeof(DHCPMessageHeader));
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if (r < 0)
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return r;
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struct iovec options;
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r = tlv_build(&message->options, &options);
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if (r < 0)
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return r;
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r = iovw_consume_iov(&iovw, &options);
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if (r < 0)
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return r;
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/* For compatibility with other implementations and network appliances, the message size should be at
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* least 300 bytes, which is the size of BOOTP message. */
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size_t padding_size = LESS_BY(BOOTP_MESSAGE_SIZE, size);
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if (padding_size > 0) {
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uint8_t *padding = new0(uint8_t, padding_size);
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if (!padding)
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return -ENOMEM;
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r = iovw_consume(&iovw, padding, padding_size);
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if (r < 0)
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return r;
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}
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*ret = TAKE_STRUCT(iovw);
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return 0;
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}
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53
src/libsystemd-network/dhcp-message.h
Normal file
53
src/libsystemd-network/dhcp-message.h
Normal file
@@ -0,0 +1,53 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "sd-forward.h"
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#include "sparse-endian.h"
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#include "tlv-util.h"
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typedef struct sd_dhcp_message sd_dhcp_message;
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sd_dhcp_message* sd_dhcp_message_ref(sd_dhcp_message *p);
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sd_dhcp_message* sd_dhcp_message_unref(sd_dhcp_message *p);
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DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_message*, sd_dhcp_message_unref);
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int dhcp_message_new(sd_dhcp_message **ret);
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int dhcp_message_init_header(
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sd_dhcp_message *message,
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uint8_t op,
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uint32_t xid,
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uint16_t arp_type,
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const struct hw_addr_data *hw_addr);
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void dhcp_message_set_broadcast_flag(sd_dhcp_message *message, bool b);
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bool dhcp_message_has_broadcast_flag(sd_dhcp_message *message);
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int dhcp_message_get_hw_addr(sd_dhcp_message *message, struct hw_addr_data *ret);
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bool dhcp_message_has_option(sd_dhcp_message *message, uint8_t code);
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void dhcp_message_remove_option(sd_dhcp_message *message, uint8_t code);
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int dhcp_message_append_option(sd_dhcp_message *message, uint8_t code, size_t length, const void *data);
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int dhcp_message_append_option_tlv(sd_dhcp_message *message, const TLV *tlv);
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int dhcp_message_append_option_flag(sd_dhcp_message *message, uint8_t code);
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int dhcp_message_append_option_u8(sd_dhcp_message *message, uint8_t code, uint8_t data);
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int dhcp_message_append_option_u16(sd_dhcp_message *message, uint8_t code, uint16_t data);
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int dhcp_message_append_option_be32(sd_dhcp_message *message, uint8_t code, be32_t data);
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int dhcp_message_get_option(sd_dhcp_message *message, uint8_t code, size_t length, void *ret);
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int dhcp_message_get_option_alloc(sd_dhcp_message *message, uint8_t code, struct iovec *ret);
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int dhcp_message_get_option_flag(sd_dhcp_message *message, uint8_t code);
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int dhcp_message_get_option_u8(sd_dhcp_message *message, uint8_t code, uint8_t *ret);
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int dhcp_message_get_option_u16(sd_dhcp_message *message, uint8_t code, uint16_t *ret);
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int dhcp_message_get_option_be32(sd_dhcp_message *message, uint8_t code, be32_t *ret);
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int dhcp_message_parse(
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const struct iovec *iov,
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uint8_t op,
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const uint32_t *xid,
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uint16_t arp_type,
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const struct hw_addr_data *hw_addr,
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sd_dhcp_message **ret);
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int dhcp_message_build(sd_dhcp_message *message, struct iovec_wrapper *ret);
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@@ -13,6 +13,7 @@
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#include "sd-forward.h"
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#include "sparse-endian.h"
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#include "time-util.h"
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#include "tlv-util.h"
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/* RFC 8925 - IPv6-Only Preferred Option for DHCPv4 3.4.
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* MIN_V6ONLY_WAIT: The lower boundary for V6ONLY_WAIT. Value: 300 seconds */
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@@ -49,6 +50,13 @@ struct DHCPMessage {
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typedef struct DHCPMessage DHCPMessage;
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assert_cc(sizeof(DHCPMessageHeader) == offsetof(DHCPMessage, options));
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struct sd_dhcp_message {
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unsigned n_ref;
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DHCPMessageHeader header;
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TLV options;
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};
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struct DHCPPacket {
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struct iphdr ip;
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struct udphdr udp;
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@@ -3,6 +3,7 @@
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libsystemd_network_sources = files(
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'arp-util.c',
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'dhcp-client-send.c',
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'dhcp-message.c',
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'dhcp-network.c',
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'dhcp-option.c',
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'dhcp-packet.c',
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@@ -77,6 +78,9 @@ executables += [
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network_test_template + {
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'sources' : files('test-dhcp-client.c'),
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},
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network_test_template + {
|
||||
'sources' : files('test-dhcp-message.c'),
|
||||
},
|
||||
network_test_template + {
|
||||
'sources' : files('test-dhcp-option.c'),
|
||||
},
|
||||
|
||||
134
src/libsystemd-network/test-dhcp-message.c
Normal file
134
src/libsystemd-network/test-dhcp-message.c
Normal file
@@ -0,0 +1,134 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
|
||||
#include <net/if_arp.h>
|
||||
|
||||
#include "dhcp-message.h"
|
||||
#include "dhcp-protocol.h"
|
||||
#include "ether-addr-util.h"
|
||||
#include "iovec-util.h"
|
||||
#include "iovec-wrapper.h"
|
||||
#include "random-util.h"
|
||||
#include "tests.h"
|
||||
|
||||
static void verify_header(sd_dhcp_message *m, uint32_t xid, const struct hw_addr_data *hw_addr) {
|
||||
ASSERT_EQ(be32toh(m->header.xid), xid);
|
||||
|
||||
ASSERT_FALSE(dhcp_message_has_broadcast_flag(m));
|
||||
dhcp_message_set_broadcast_flag(m, true);
|
||||
ASSERT_TRUE(dhcp_message_has_broadcast_flag(m));
|
||||
dhcp_message_set_broadcast_flag(m, false);
|
||||
ASSERT_FALSE(dhcp_message_has_broadcast_flag(m));
|
||||
|
||||
struct hw_addr_data a;
|
||||
ASSERT_OK(dhcp_message_get_hw_addr(m, &a));
|
||||
ASSERT_TRUE(hw_addr_equal(&a, hw_addr));
|
||||
}
|
||||
|
||||
static void verify_flag(sd_dhcp_message *m) {
|
||||
ASSERT_TRUE(dhcp_message_has_option(m, SD_DHCP_OPTION_RAPID_COMMIT));
|
||||
ASSERT_OK(dhcp_message_get_option_flag(m, SD_DHCP_OPTION_RAPID_COMMIT));
|
||||
ASSERT_ERROR(dhcp_message_get_option_u8(m, SD_DHCP_OPTION_RAPID_COMMIT, NULL), ENODATA); /* size mismatch */
|
||||
}
|
||||
|
||||
static void verify_u8(sd_dhcp_message *m, uint8_t expected) {
|
||||
uint8_t u;
|
||||
ASSERT_OK(dhcp_message_get_option_u8(m, SD_DHCP_OPTION_MESSAGE_TYPE, &u));
|
||||
ASSERT_EQ(u, expected);
|
||||
}
|
||||
|
||||
static void verify_u16(sd_dhcp_message *m, uint16_t expected) {
|
||||
uint16_t u;
|
||||
ASSERT_OK(dhcp_message_get_option_u16(m, SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, &u));
|
||||
ASSERT_EQ(u, expected);
|
||||
}
|
||||
|
||||
static void verify_address(sd_dhcp_message *m, const struct in_addr *expected) {
|
||||
struct in_addr a;
|
||||
ASSERT_OK(dhcp_message_get_option_be32(m, SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, &a.s_addr));
|
||||
ASSERT_EQ(a.s_addr, expected->s_addr);
|
||||
}
|
||||
|
||||
TEST(dhcp_message) {
|
||||
_cleanup_(sd_dhcp_message_unrefp) sd_dhcp_message *m = NULL;
|
||||
|
||||
ASSERT_OK(dhcp_message_new(&m));
|
||||
ASSERT_NOT_NULL(m);
|
||||
|
||||
uint32_t xid = random_u32();
|
||||
|
||||
struct hw_addr_data hw_addr = {
|
||||
.length = ETH_ALEN,
|
||||
.ether = {{ 'A', 'B', 'C', '1', '2', '3' }},
|
||||
};
|
||||
|
||||
/* 192.0.2.42 */
|
||||
struct in_addr addr = { .s_addr = htobe32(0xC000022a) };
|
||||
|
||||
ASSERT_OK(dhcp_message_init_header(
|
||||
m,
|
||||
BOOTREQUEST,
|
||||
xid,
|
||||
ARPHRD_ETHER,
|
||||
&hw_addr));
|
||||
|
||||
/* header */
|
||||
verify_header(m, xid, &hw_addr);
|
||||
|
||||
ASSERT_ERROR(dhcp_message_append_option(m, SD_DHCP_OPTION_PAD, 0, NULL), EINVAL);
|
||||
ASSERT_ERROR(dhcp_message_append_option(m, SD_DHCP_OPTION_END, 0, NULL), EINVAL);
|
||||
|
||||
/* flag */
|
||||
ASSERT_ERROR(dhcp_message_get_option_flag(m, SD_DHCP_OPTION_RAPID_COMMIT), ENODATA);
|
||||
ASSERT_OK(dhcp_message_append_option_flag(m, SD_DHCP_OPTION_RAPID_COMMIT));
|
||||
ASSERT_ERROR(dhcp_message_append_option_flag(m, SD_DHCP_OPTION_RAPID_COMMIT), EEXIST);
|
||||
verify_flag(m);
|
||||
|
||||
/* u8 */
|
||||
ASSERT_ERROR(dhcp_message_get_option_u8(m, SD_DHCP_OPTION_MESSAGE_TYPE, NULL), ENODATA);
|
||||
ASSERT_OK(dhcp_message_append_option_u8(m, SD_DHCP_OPTION_MESSAGE_TYPE, DHCP_DISCOVER));
|
||||
ASSERT_ERROR(dhcp_message_append_option_u8(m, SD_DHCP_OPTION_MESSAGE_TYPE, DHCP_REQUEST), EEXIST);
|
||||
verify_u8(m, DHCP_DISCOVER);
|
||||
|
||||
/* u16 */
|
||||
ASSERT_OK(dhcp_message_append_option_u16(m, SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, 512));
|
||||
ASSERT_ERROR(dhcp_message_append_option_u16(m, SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, 1024), EEXIST);
|
||||
ASSERT_ERROR(dhcp_message_append_option_u8(m, SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, 32), EEXIST);
|
||||
verify_u16(m, 512);
|
||||
|
||||
/* address */
|
||||
ASSERT_OK(dhcp_message_append_option_be32(m, SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, addr.s_addr));
|
||||
ASSERT_ERROR(dhcp_message_append_option_be32(m, SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, addr.s_addr), EEXIST);
|
||||
verify_address(m, &addr);
|
||||
|
||||
/* build and parse */
|
||||
_cleanup_(iovw_done_free) struct iovec_wrapper iovw = {};
|
||||
ASSERT_OK(dhcp_message_build(m, &iovw));
|
||||
|
||||
_cleanup_(iovec_done) struct iovec joined = {};
|
||||
ASSERT_OK(iovw_concat(&iovw, &joined));
|
||||
|
||||
_cleanup_(sd_dhcp_message_unrefp) sd_dhcp_message *m2 = NULL;
|
||||
ASSERT_OK(dhcp_message_parse(
|
||||
&joined,
|
||||
BOOTREQUEST,
|
||||
&xid,
|
||||
ARPHRD_ETHER,
|
||||
&hw_addr,
|
||||
&m2));
|
||||
|
||||
ASSERT_EQ(memcmp(&m2->header, &m->header, sizeof(m->header)), 0);
|
||||
|
||||
/* verify parsed message */
|
||||
verify_header(m2, xid, &hw_addr);
|
||||
verify_flag(m2);
|
||||
verify_u8(m2, DHCP_DISCOVER);
|
||||
verify_u16(m2, 512);
|
||||
verify_address(m2, &addr);
|
||||
|
||||
/* build again, and verify the packet */
|
||||
_cleanup_(iovw_done_free) struct iovec_wrapper iovw2 = {};
|
||||
ASSERT_OK(dhcp_message_build(m2, &iovw2));
|
||||
ASSERT_TRUE(iovw_equal(&iovw, &iovw2));
|
||||
}
|
||||
|
||||
DEFINE_TEST_MAIN(LOG_DEBUG);
|
||||
Reference in New Issue
Block a user