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#include "common.h"
LIBNET_API
libnet_ptag_t libnet_build_lldp_chassis(const uint8_t subtype,
const uint8_t *const value,const uint8_t value_s, libnet_t *l,
libnet_ptag_t ptag)
{
assert(value != NULL && "Chassis ID string cannot be a NULL");
assert((value_s != 0) && "Chassis ID string length must be greater or equal to 1");
assert(LIBNET_LLDP_TLV_HDR_SIZE == 0x02 && "TLV header size must be a 2 bytes");
assert(LIBNET_LLDP_SUBTYPE_SIZE == 0x01 && "Subtype field size must be 1 byte");
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_lldp_hdr hdr;
memset(&hdr, 0, sizeof(struct libnet_lldp_hdr));
if (l == NULL)
{
return (-1);
}
if(value == NULL)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): Chassis ID string is NULL", __func__);
return (-1);
}
if(value_s == 0)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): Incorrect Chassis ID string length", __func__);
return (-1);
}
/* size of memory block */
n = h = LIBNET_LLDP_TLV_HDR_SIZE + /* TLV Header size */
LIBNET_LLDP_SUBTYPE_SIZE + /* Chassis ID subtype size */
value_s; /* Chassis ID string length */
LIBNET_LLDP_TLV_SET_TYPE(hdr.tlv_info, LIBNET_LLDP_CHASSIS_ID);
LIBNET_LLDP_TLV_SET_LEN(hdr.tlv_info, value_s + LIBNET_LLDP_SUBTYPE_SIZE);
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_LLDP_CHASSIS_H);
if (p == NULL)
{
return (-1);
}
const uint16_t type_and_len = htons(hdr.tlv_info);
if (libnet_pblock_append(l, p, &type_and_len, sizeof(type_and_len)) == -1)
{
goto bad;
}
if (libnet_pblock_append(l, p, &subtype, sizeof(subtype)) == -1)
{
goto bad;
}
if (libnet_pblock_append(l, p, value, value_s) == -1)
{
goto bad;
}
return (ptag ? ptag
: libnet_pblock_update(l, p, h, LIBNET_PBLOCK_LLDP_CHASSIS_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/**
* Local Variables:
* indent-tabs-mode: nil
* c-file-style: "stroustrup"
* End:
*/
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