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[mirror_frr.git] / lib / yang_wrappers.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2018  NetDEF, Inc.
 *                     Renato Westphal
 */

#include <zebra.h>

#include "base64.h"
#include "log.h"
#include "lib_errors.h"
#include "northbound.h"
#include "printfrr.h"
#include "nexthop.h"
#include "printfrr.h"


#define YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt)                           \
        ({                                                                     \
                va_list __ap;                                                  \
                va_start(__ap, (xpath_fmt));                                   \
                const struct lyd_value *__dvalue =                             \
                        yang_dnode_xpath_get_value(dnode, xpath_fmt, __ap);    \
                va_end(__ap);                                                  \
                __dvalue;                                                      \
        })

#define YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt)                           \
        ({                                                                     \
                va_list __ap;                                                  \
                va_start(__ap, (xpath_fmt));                                   \
                const char *__canon =                                          \
                        yang_dnode_xpath_get_canon(dnode, xpath_fmt, __ap);    \
                va_end(__ap);                                                  \
                __canon;                                                       \
        })

#define YANG_DNODE_GET_ASSERT(dnode, xpath)                                    \
        do {                                                                   \
                if ((dnode) == NULL) {                                         \
                        flog_err(EC_LIB_YANG_DNODE_NOT_FOUND,                  \
                                 "%s: couldn't find %s", __func__, (xpath));   \
                        zlog_backtrace(LOG_ERR);                               \
                        abort();                                               \
                }                                                              \
        } while (0)

PRINTFRR(2, 0)
static inline const char *
yang_dnode_xpath_get_canon(const struct lyd_node *dnode, const char *xpath_fmt,
                           va_list ap)
{
        const struct lyd_node_term *__dleaf =
                (const struct lyd_node_term *)dnode;
        assert(__dleaf);
        if (xpath_fmt) {
                char __xpath[XPATH_MAXLEN];
                vsnprintf(__xpath, sizeof(__xpath), xpath_fmt, ap);
                __dleaf = (const struct lyd_node_term *)yang_dnode_get(dnode,
                                                                       __xpath);
                YANG_DNODE_GET_ASSERT(__dleaf, __xpath);
        }
        return lyd_get_value(&__dleaf->node);
}

PRINTFRR(2, 0)
static inline const struct lyd_value *
yang_dnode_xpath_get_value(const struct lyd_node *dnode, const char *xpath_fmt,
                           va_list ap)
{
        const struct lyd_node_term *__dleaf =
                (const struct lyd_node_term *)dnode;
        assert(__dleaf);
        if (xpath_fmt) {
                char __xpath[XPATH_MAXLEN];
                vsnprintf(__xpath, sizeof(__xpath), xpath_fmt, ap);
                __dleaf = (const struct lyd_node_term *)yang_dnode_get(dnode,
                                                                       __xpath);
                YANG_DNODE_GET_ASSERT(__dleaf, __xpath);
        }
        const struct lyd_value *__dvalue = &__dleaf->value;
        if (__dvalue->realtype->basetype == LY_TYPE_UNION)
                __dvalue = &__dvalue->subvalue->value;
        return __dvalue;
}

static const char *yang_get_default_value(const char *xpath)
{
        const struct lysc_node *snode;
        const char *value;

        snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
        if (snode == NULL) {
                flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
                         "%s: unknown data path: %s", __func__, xpath);
                zlog_backtrace(LOG_ERR);
                abort();
        }

        value = yang_snode_get_default(snode);
        assert(value);

        return value;
}

/*
 * Primitive type: bool.
 */
bool yang_str2bool(const char *value)
{
        return strmatch(value, "true");
}

struct yang_data *yang_data_new_bool(const char *xpath, bool value)
{
        return yang_data_new(xpath, (value) ? "true" : "false");
}

bool yang_dnode_get_bool(const struct lyd_node *dnode, const char *xpath_fmt,
                         ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_BOOL);
        return dvalue->boolean;
}

bool yang_get_default_bool(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2bool(value);
}

/*
 * Primitive type: dec64.
 */
double yang_str2dec64(const char *xpath, const char *value)
{
        double dbl = 0;

        if (sscanf(value, "%lf", &dbl) != 1) {
                flog_err(EC_LIB_YANG_DATA_CONVERT,
                         "%s: couldn't convert string to decimal64 [xpath %s]",
                         __func__, xpath);
                zlog_backtrace(LOG_ERR);
                abort();
        }

        return dbl;
}

struct yang_data *yang_data_new_dec64(const char *xpath, double value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%lf", value);
        return yang_data_new(xpath, value_str);
}

double yang_dnode_get_dec64(const struct lyd_node *dnode, const char *xpath_fmt,
                            ...)
{
        const double denom[19] = {1e0,   1e-1,  1e-2,  1e-3,  1e-4,
                                  1e-5,  1e-6,  1e-7,  1e-8,  1e-9,
                                  1e-10, 1e-11, 1e-12, 1e-13, 1e-14,
                                  1e-15, 1e-16, 1e-17, 1e-18};
        const struct lysc_type_dec *dectype;
        const struct lyd_value *dvalue;

        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        dectype = (const struct lysc_type_dec *)dvalue->realtype;
        assert(dectype->basetype == LY_TYPE_DEC64);
        assert(dectype->fraction_digits < sizeof(denom) / sizeof(*denom));
        return (double)dvalue->dec64 * denom[dectype->fraction_digits];
}

double yang_get_default_dec64(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2dec64(xpath, value);
}

/*
 * Primitive type: enum.
 */
int yang_str2enum(const char *xpath, const char *value)
{
        const struct lysc_node *snode;
        const struct lysc_node_leaf *sleaf;
        const struct lysc_type_enum *type;
        const struct lysc_type_bitenum_item *enums;

        snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
        if (snode == NULL) {
                flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
                         "%s: unknown data path: %s", __func__, xpath);
                zlog_backtrace(LOG_ERR);
                abort();
        }

        assert(snode->nodetype == LYS_LEAF);
        sleaf = (const struct lysc_node_leaf *)snode;
        type = (const struct lysc_type_enum *)sleaf->type;
        assert(type->basetype == LY_TYPE_ENUM);
        enums = type->enums;
        unsigned int count = LY_ARRAY_COUNT(enums);
        for (unsigned int i = 0; i < count; i++) {
                if (strmatch(value, enums[i].name)) {
                        assert(CHECK_FLAG(enums[i].flags, LYS_SET_VALUE));
                        return enums[i].value;
                }
        }

        flog_err(EC_LIB_YANG_DATA_CONVERT,
                 "%s: couldn't convert string to enum [xpath %s]", __func__,
                 xpath);
        zlog_backtrace(LOG_ERR);
        abort();
}

struct yang_data *yang_data_new_enum(const char *xpath, int value)
{
        const struct lysc_node *snode;
        const struct lysc_node_leaf *sleaf;
        const struct lysc_type_enum *type;
        const struct lysc_type_bitenum_item *enums;

        snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
        if (snode == NULL) {
                flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
                         "%s: unknown data path: %s", __func__, xpath);
                zlog_backtrace(LOG_ERR);
                abort();
        }

        assert(snode->nodetype == LYS_LEAF);
        sleaf = (const struct lysc_node_leaf *)snode;
        type = (const struct lysc_type_enum *)sleaf->type;
        assert(type->basetype == LY_TYPE_ENUM);
        enums = type->enums;
        unsigned int count = LY_ARRAY_COUNT(enums);
        for (unsigned int i = 0; i < count; i++) {
                if (CHECK_FLAG(enums[i].flags, LYS_SET_VALUE)
                    && value == enums[i].value)
                        return yang_data_new(xpath, enums[i].name);
        }

        flog_err(EC_LIB_YANG_DATA_CONVERT,
                 "%s: couldn't convert enum to string [xpath %s]", __func__,
                 xpath);
        zlog_backtrace(LOG_ERR);
        abort();
}

int yang_dnode_get_enum(const struct lyd_node *dnode, const char *xpath_fmt,
                        ...)
{
        const struct lyd_value *dvalue;

        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_ENUM);
        assert(dvalue->enum_item->flags & LYS_SET_VALUE);
        return dvalue->enum_item->value;
}

int yang_get_default_enum(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2enum(xpath, value);
}

/*
 * Primitive type: int8.
 */
int8_t yang_str2int8(const char *value)
{
        return strtol(value, NULL, 10);
}

struct yang_data *yang_data_new_int8(const char *xpath, int8_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%d", value);
        return yang_data_new(xpath, value_str);
}

int8_t yang_dnode_get_int8(const struct lyd_node *dnode, const char *xpath_fmt,
                           ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_INT8);
        return dvalue->int8;
}

int8_t yang_get_default_int8(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2int8(value);
}

/*
 * Primitive type: int16.
 */
int16_t yang_str2int16(const char *value)
{
        return strtol(value, NULL, 10);
}

struct yang_data *yang_data_new_int16(const char *xpath, int16_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%d", value);
        return yang_data_new(xpath, value_str);
}

int16_t yang_dnode_get_int16(const struct lyd_node *dnode,
                             const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_INT16);
        return dvalue->int16;
}

int16_t yang_get_default_int16(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2int16(value);
}

/*
 * Primitive type: int32.
 */
int32_t yang_str2int32(const char *value)
{
        return strtol(value, NULL, 10);
}

struct yang_data *yang_data_new_int32(const char *xpath, int32_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%d", value);
        return yang_data_new(xpath, value_str);
}

int32_t yang_dnode_get_int32(const struct lyd_node *dnode,
                             const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_INT32);
        return dvalue->int32;
}

int32_t yang_get_default_int32(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2int32(value);
}

/*
 * Primitive type: int64.
 */
int64_t yang_str2int64(const char *value)
{
        return strtoll(value, NULL, 10);
}

struct yang_data *yang_data_new_int64(const char *xpath, int64_t value)
{
        char value_str[BUFSIZ];

        snprintfrr(value_str, sizeof(value_str), "%" PRId64, value);
        return yang_data_new(xpath, value_str);
}

int64_t yang_dnode_get_int64(const struct lyd_node *dnode,
                             const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_INT64);
        return dvalue->int64;
}

int64_t yang_get_default_int64(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2int64(value);
}

/*
 * Primitive type: uint8.
 */
uint8_t yang_str2uint8(const char *value)
{
        return strtoul(value, NULL, 10);
}

struct yang_data *yang_data_new_uint8(const char *xpath, uint8_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%u", value);
        return yang_data_new(xpath, value_str);
}

uint8_t yang_dnode_get_uint8(const struct lyd_node *dnode,
                             const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_UINT8);
        return dvalue->uint8;
}

uint8_t yang_get_default_uint8(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2uint8(value);
}

/*
 * Primitive type: uint16.
 */
uint16_t yang_str2uint16(const char *value)
{
        return strtoul(value, NULL, 10);
}

struct yang_data *yang_data_new_uint16(const char *xpath, uint16_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%u", value);
        return yang_data_new(xpath, value_str);
}

uint16_t yang_dnode_get_uint16(const struct lyd_node *dnode,
                               const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_UINT16);
        return dvalue->uint16;
}

uint16_t yang_get_default_uint16(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2uint16(value);
}

/*
 * Primitive type: uint32.
 */
uint32_t yang_str2uint32(const char *value)
{
        return strtoul(value, NULL, 10);
}

struct yang_data *yang_data_new_uint32(const char *xpath, uint32_t value)
{
        char value_str[BUFSIZ];

        snprintf(value_str, sizeof(value_str), "%u", value);
        return yang_data_new(xpath, value_str);
}

uint32_t yang_dnode_get_uint32(const struct lyd_node *dnode,
                               const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_UINT32);
        return dvalue->uint32;
}

uint32_t yang_get_default_uint32(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2uint32(value);
}

/*
 * Primitive type: uint64.
 */
uint64_t yang_str2uint64(const char *value)
{
        return strtoull(value, NULL, 10);
}

struct yang_data *yang_data_new_uint64(const char *xpath, uint64_t value)
{
        char value_str[BUFSIZ];

        snprintfrr(value_str, sizeof(value_str), "%" PRIu64, value);
        return yang_data_new(xpath, value_str);
}

uint64_t yang_dnode_get_uint64(const struct lyd_node *dnode,
                               const char *xpath_fmt, ...)
{
        const struct lyd_value *dvalue;
        dvalue = YANG_DNODE_XPATH_GET_VALUE(dnode, xpath_fmt);
        assert(dvalue->realtype->basetype == LY_TYPE_UINT64);
        return dvalue->uint64;
}

uint64_t yang_get_default_uint64(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        return yang_str2uint64(value);
}

/*
 * Primitive type: string.
 *
 * All string wrappers can be used with non-string types.
 */
struct yang_data *yang_data_new_string(const char *xpath, const char *value)
{
        return yang_data_new(xpath, value);
}

const char *yang_dnode_get_string(const struct lyd_node *dnode,
                                  const char *xpath_fmt, ...)
{
        return YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
}

void yang_dnode_get_string_buf(char *buf, size_t size,
                               const struct lyd_node *dnode,
                               const char *xpath_fmt, ...)
{
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        if (strlcpy(buf, canon, size) >= size) {
                char xpath[XPATH_MAXLEN];

                yang_dnode_get_path(dnode, xpath, sizeof(xpath));
                flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
                          "%s: value was truncated [xpath %s]", __func__,
                          xpath);
        }
}

const char *yang_get_default_string(const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        return yang_get_default_value(xpath);
}

void yang_get_default_string_buf(char *buf, size_t size, const char *xpath_fmt,
                                 ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        if (strlcpy(buf, value, size) >= size)
                flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
                          "%s: value was truncated [xpath %s]", __func__,
                          xpath);
}

/*
 * Primitive type: binary.
 */
struct yang_data *yang_data_new_binary(const char *xpath, const char *value,
                                       size_t len)
{
        char *value_str;
        struct base64_encodestate s;
        int cnt;
        char *c;
        struct yang_data *data;

        value_str = (char *)malloc(len * 2);
        base64_init_encodestate(&s);
        cnt = base64_encode_block(value, len, value_str, &s);
        c = value_str + cnt;
        cnt = base64_encode_blockend(c, &s);
        c += cnt;
        *c = 0;
        data = yang_data_new(xpath, value_str);
        free(value_str);
        return data;
}

size_t yang_dnode_get_binary_buf(char *buf, size_t size,
                                 const struct lyd_node *dnode,
                                 const char *xpath_fmt, ...)
{
        const char *canon;
        size_t cannon_len;
        size_t decode_len;
        size_t ret_len;
        size_t cnt;
        char *value_str;
        struct base64_decodestate s;

        canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        cannon_len = strlen(canon);
        decode_len = cannon_len + 1;
        value_str = (char *)malloc(decode_len);
        base64_init_decodestate(&s);
        cnt = base64_decode_block(canon, cannon_len, value_str, &s);

        ret_len = size > cnt ? cnt : size;
        memcpy(buf, value_str, ret_len);
        if (size < cnt) {
                char xpath[XPATH_MAXLEN];

                yang_dnode_get_path(dnode, xpath, sizeof(xpath));
                flog_warn(EC_LIB_YANG_DATA_TRUNCATED,
                          "%s: value was truncated [xpath %s]", __func__,
                          xpath);
        }
        free(value_str);
        return ret_len;
}


/*
 * Primitive type: empty.
 */
struct yang_data *yang_data_new_empty(const char *xpath)
{
        return yang_data_new(xpath, NULL);
}

bool yang_dnode_get_empty(const struct lyd_node *dnode, const char *xpath_fmt,
                          ...)
{
        va_list ap;
        char xpath[XPATH_MAXLEN];
        const struct lyd_node_term *dleaf;

        assert(dnode);

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        dnode = yang_dnode_get(dnode, xpath);
        if (dnode) {
                dleaf = (const struct lyd_node_term *)dnode;
                if (dleaf->value.realtype->basetype == LY_TYPE_EMPTY)
                        return true;
        }

        return false;
}

/*
 * Derived type: IP prefix.
 */
void yang_str2prefix(const char *value, union prefixptr prefix)
{
        (void)str2prefix(value, prefix.p);
        apply_mask(prefix.p);
}

struct yang_data *yang_data_new_prefix(const char *xpath,
                                       union prefixconstptr prefix)
{
        char value_str[PREFIX2STR_BUFFER];

        (void)prefix2str(prefix.p, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_prefix(struct prefix *prefix, const struct lyd_node *dnode,
                           const char *xpath_fmt, ...)
{
        const char *canon;
        /*
         * Initialize prefix to avoid static analyzer complaints about
         * uninitialized memory.
         */
        memset(prefix, 0, sizeof(*prefix));

        /* XXX ip_prefix is a native type now in ly2, leverage? */
        canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)str2prefix(canon, prefix);
}

void yang_get_default_prefix(union prefixptr var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2prefix(value, var);
}

/*
 * Derived type: ipv4.
 */
void yang_str2ipv4(const char *value, struct in_addr *addr)
{
        (void)inet_pton(AF_INET, value, addr);
}

struct yang_data *yang_data_new_ipv4(const char *xpath,
                                     const struct in_addr *addr)
{
        char value_str[INET_ADDRSTRLEN];

        (void)inet_ntop(AF_INET, addr, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_ipv4(struct in_addr *addr, const struct lyd_node *dnode,
                         const char *xpath_fmt, ...)
{
        /* XXX libyang2 IPv4 address is a native type now in ly2 */
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)inet_pton(AF_INET, canon, addr);
}

void yang_get_default_ipv4(struct in_addr *var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2ipv4(value, var);
}

/*
 * Derived type: ipv4p.
 */
void yang_str2ipv4p(const char *value, union prefixptr prefix)
{
        struct prefix_ipv4 *prefix4 = prefix.p4;

        (void)str2prefix_ipv4(value, prefix4);
        apply_mask_ipv4(prefix4);
}

struct yang_data *yang_data_new_ipv4p(const char *xpath,
                                      union prefixconstptr prefix)
{
        char value_str[PREFIX2STR_BUFFER];

        (void)prefix2str(prefix.p, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_ipv4p(union prefixptr prefix, const struct lyd_node *dnode,
                          const char *xpath_fmt, ...)
{
        struct prefix_ipv4 *prefix4 = prefix.p4;
        /* XXX libyang2: ipv4/6 address is a native type now in ly2 */
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)str2prefix_ipv4(canon, prefix4);
}

void yang_get_default_ipv4p(union prefixptr var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2ipv4p(value, var);
}

/*
 * Derived type: ipv6.
 */
void yang_str2ipv6(const char *value, struct in6_addr *addr)
{
        (void)inet_pton(AF_INET6, value, addr);
}

struct yang_data *yang_data_new_ipv6(const char *xpath,
                                     const struct in6_addr *addr)
{
        char value_str[INET6_ADDRSTRLEN];

        (void)inet_ntop(AF_INET6, addr, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_ipv6(struct in6_addr *addr, const struct lyd_node *dnode,
                         const char *xpath_fmt, ...)
{
        /* XXX libyang2: IPv6 address is a native type now, leverage. */
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)inet_pton(AF_INET6, canon, addr);
}

void yang_get_default_ipv6(struct in6_addr *var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2ipv6(value, var);
}

/*
 * Derived type: ipv6p.
 */
void yang_str2ipv6p(const char *value, union prefixptr prefix)
{
        struct prefix_ipv6 *prefix6 = prefix.p6;

        (void)str2prefix_ipv6(value, prefix6);
        apply_mask_ipv6(prefix6);
}

struct yang_data *yang_data_new_ipv6p(const char *xpath,
                                      union prefixconstptr prefix)
{
        char value_str[PREFIX2STR_BUFFER];

        (void)prefix2str(prefix.p, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_ipv6p(union prefixptr prefix, const struct lyd_node *dnode,
                          const char *xpath_fmt, ...)
{
        struct prefix_ipv6 *prefix6 = prefix.p6;

        /* XXX IPv6 address is a native type now in ly2 -- can we leverage? */
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)str2prefix_ipv6(canon, prefix6);
}

void yang_get_default_ipv6p(union prefixptr var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2ipv6p(value, var);
}

/*
 * Derived type: ip.
 */
void yang_str2ip(const char *value, struct ipaddr *ip)
{
        (void)str2ipaddr(value, ip);
}

struct yang_data *yang_data_new_ip(const char *xpath, const struct ipaddr *addr)
{
        size_t sz = IS_IPADDR_V4(addr) ? INET_ADDRSTRLEN : INET6_ADDRSTRLEN;
        char value_str[sz];

        ipaddr2str(addr, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_dnode_get_ip(struct ipaddr *addr, const struct lyd_node *dnode,
                       const char *xpath_fmt, ...)
{
        /* XXX IPv4 address could be a plugin type now in ly2, leverage? */
        const char *canon = YANG_DNODE_XPATH_GET_CANON(dnode, xpath_fmt);
        (void)str2ipaddr(canon, addr);
}

void yang_get_default_ip(struct ipaddr *var, const char *xpath_fmt, ...)
{
        char xpath[XPATH_MAXLEN];
        const char *value;
        va_list ap;

        va_start(ap, xpath_fmt);
        vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
        va_end(ap);

        value = yang_get_default_value(xpath);
        yang_str2ip(value, var);
}

struct yang_data *yang_data_new_mac(const char *xpath,
                                    const struct ethaddr *mac)
{
        char value_str[ETHER_ADDR_STRLEN];

        prefix_mac2str(mac, value_str, sizeof(value_str));
        return yang_data_new(xpath, value_str);
}

void yang_str2mac(const char *value, struct ethaddr *mac)
{
        (void)prefix_str2mac(value, mac);
}

struct yang_data *yang_data_new_date_and_time(const char *xpath, time_t time)
{
        struct tm tm;
        char timebuf[MONOTIME_STRLEN];
        struct timeval _time, time_real;
        char *ts_dot;
        uint16_t buflen;

        _time.tv_sec = time;
        _time.tv_usec = 0;
        monotime_to_realtime(&_time, &time_real);

        gmtime_r(&time_real.tv_sec, &tm);

        /* rfc-3339 format */
        strftime(timebuf, sizeof(timebuf), "%Y-%m-%dT%H:%M:%S", &tm);
        buflen = strlen(timebuf);
        ts_dot = timebuf + buflen;

        /* microseconds and appends Z */
        snprintfrr(ts_dot, sizeof(timebuf) - buflen, ".%06luZ",
                   (unsigned long)time_real.tv_usec);

        return yang_data_new(xpath, timebuf);
}

const char *yang_nexthop_type2str(uint32_t ntype)
{
        switch (ntype) {
        case NEXTHOP_TYPE_IFINDEX:
                return "ifindex";
                break;
        case NEXTHOP_TYPE_IPV4:
                return "ip4";
                break;
        case NEXTHOP_TYPE_IPV4_IFINDEX:
                return "ip4-ifindex";
                break;
        case NEXTHOP_TYPE_IPV6:
                return "ip6";
                break;
        case NEXTHOP_TYPE_IPV6_IFINDEX:
                return "ip6-ifindex";
                break;
        case NEXTHOP_TYPE_BLACKHOLE:
                return "blackhole";
                break;
        default:
                return "unknown";
                break;
        }
}


const char *yang_afi_safi_value2identity(afi_t afi, safi_t safi)
{
        if (afi == AFI_IP && safi == SAFI_UNICAST)
                return "frr-routing:ipv4-unicast";
        if (afi == AFI_IP6 && safi == SAFI_UNICAST)
                return "frr-routing:ipv6-unicast";
        if (afi == AFI_IP && safi == SAFI_MULTICAST)
                return "frr-routing:ipv4-multicast";
        if (afi == AFI_IP6 && safi == SAFI_MULTICAST)
                return "frr-routing:ipv6-multicast";
        if (afi == AFI_IP && safi == SAFI_MPLS_VPN)
                return "frr-routing:l3vpn-ipv4-unicast";
        if (afi == AFI_IP6 && safi == SAFI_MPLS_VPN)
                return "frr-routing:l3vpn-ipv6-unicast";
        if (afi == AFI_L2VPN && safi == SAFI_EVPN)
                return "frr-routing:l2vpn-evpn";
        if (afi == AFI_IP && safi == SAFI_LABELED_UNICAST)
                return "frr-routing:ipv4-labeled-unicast";
        if (afi == AFI_IP6 && safi == SAFI_LABELED_UNICAST)
                return "frr-routing:ipv6-labeled-unicast";
        if (afi == AFI_IP && safi == SAFI_FLOWSPEC)
                return "frr-routing:ipv4-flowspec";
        if (afi == AFI_IP6 && safi == SAFI_FLOWSPEC)
                return "frr-routing:ipv6-flowspec";

        return NULL;
}

void yang_afi_safi_identity2value(const char *key, afi_t *afi, safi_t *safi)
{
        if (strmatch(key, "frr-routing:ipv4-unicast")) {
                *afi = AFI_IP;
                *safi = SAFI_UNICAST;
        } else if (strmatch(key, "frr-routing:ipv6-unicast")) {
                *afi = AFI_IP6;
                *safi = SAFI_UNICAST;
        } else if (strmatch(key, "frr-routing:ipv4-multicast")) {
                *afi = AFI_IP;
                *safi = SAFI_MULTICAST;
        } else if (strmatch(key, "frr-routing:ipv6-multicast")) {
                *afi = AFI_IP6;
                *safi = SAFI_MULTICAST;
        } else if (strmatch(key, "frr-routing:l3vpn-ipv4-unicast")) {
                *afi = AFI_IP;
                *safi = SAFI_MPLS_VPN;
        } else if (strmatch(key, "frr-routing:l3vpn-ipv6-unicast")) {
                *afi = AFI_IP6;
                *safi = SAFI_MPLS_VPN;
        } else if (strmatch(key, "frr-routing:ipv4-labeled-unicast")) {
                *afi = AFI_IP;
                *safi = SAFI_LABELED_UNICAST;
        } else if (strmatch(key, "frr-routing:ipv6-labeled-unicast")) {
                *afi = AFI_IP6;
                *safi = SAFI_LABELED_UNICAST;
        } else if (strmatch(key, "frr-routing:l2vpn-evpn")) {
                *afi = AFI_L2VPN;
                *safi = SAFI_EVPN;
        } else if (strmatch(key, "frr-routing:ipv4-flowspec")) {
                *afi = AFI_IP;
                *safi = SAFI_FLOWSPEC;
        } else if (strmatch(key, "frr-routing:ipv6-flowspec")) {
                *afi = AFI_IP6;
                *safi = SAFI_FLOWSPEC;
        } else {
                *afi = AFI_UNSPEC;
                *safi = SAFI_UNSPEC;
        }
}