/* Portions of this file are subject to the following copyright(s).  See

 * the Net-SNMP's COPYING file for more details and other copyrights

 * that may apply:

 */

/*

 * Portions of this file are copyrighted by:

 * Copyright (C) 2007 Apple, Inc. All rights reserved.

 * Use is subject to license terms specified in the COPYING file

 * distributed with the Net-SNMP package.

 *

 * Portions of this file are copyrighted by:

 * Copyright (c) 2016 VMware, Inc. All rights reserved.

 * Use is subject to license terms specified in the COPYING file

 * distributed with the Net-SNMP package.

 */

#include <net-snmp/net-snmp-config.h>

#include <net-snmp/net-snmp-features.h>

#include <net-snmp/net-snmp-includes.h>

#include <net-snmp/library/container.h>

#include <net-snmp/library/container_binary_array.h>

#include <net-snmp/library/container_list_ssll.h>

#include <net-snmp/library/container_null.h>

#include "factory.h"

#include <stdint.h>

netsnmp_feature_child_of(container_all, libnetsnmp);

netsnmp_feature_child_of(container_factories, container_all);

netsnmp_feature_child_of(container_types, container_all);

netsnmp_feature_child_of(container_compare, container_all);

netsnmp_feature_child_of(container_dup, container_all);

netsnmp_feature_child_of(container_free_all, container_all);

netsnmp_feature_child_of(subcontainer_find, container_all);

netsnmp_feature_child_of(container_ncompare_cstring, container_compare);

netsnmp_feature_child_of(container_compare_mem, container_compare);

netsnmp_feature_child_of(container_compare_long, container_compare);

netsnmp_feature_child_of(container_compare_ulong, container_compare);

netsnmp_feature_child_of(container_compare_int32, container_compare);

netsnmp_feature_child_of(container_compare_uint32, container_compare);

netsnmp_feature_child_of(container_find_factory, container_factories);

/** @defgroup container container

 */

/*------------------------------------------------------------------

 */

static netsnmp_container *containers = NULL;

typedef struct container_type_s {

   const char                 *name;

   netsnmp_factory            *factory;

   netsnmp_container_compare  *compare;

} container_type;

netsnmp_factory *

netsnmp_container_get_factory(const char *type);

/*------------------------------------------------------------------

 */

static void 

_factory_free(void *dat, void *context)

{

    container_type *data = (container_type *)dat;

    if (data == NULL)

  return;

    if (data->name != NULL) {

        DEBUGMSGTL(("container", "  _factory_free_list() called for %s\n",

                    data->name));

  free(NETSNMP_REMOVE_CONST(void *, data->name)); /* SNMP_FREE wasted on object about to be freed */

    }

    free(data); /* SNMP_FREE wasted on param */

}

/*------------------------------------------------------------------

 */

void

netsnmp_container_init_list(void)

{

    if (NULL != containers)

        return;

    /*

     * create a binary arry container to hold container

     * factories

     */

    containers = netsnmp_container_get_binary_array();

    containers->compare = netsnmp_compare_cstring;

    containers->container_name = strdup("container list");

    /*

     * register containers

     */

    netsnmp_container_binary_array_init();

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_LINKED_LIST

    netsnmp_container_ssll_init();

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_LINKED_LIST */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_NULL

    netsnmp_container_null_init();

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_NULL */

    /*

     * default aliases for some containers

     */

    netsnmp_container_register("table_container",

                               netsnmp_container_get_factory("binary_array"));

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_LINKED_LIST

    netsnmp_container_register("linked_list",

                               netsnmp_container_get_factory("sorted_singly_linked_list"));

    netsnmp_container_register("ssll_container",

                               netsnmp_container_get_factory("sorted_singly_linked_list"));

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_LINKED_LIST */

    netsnmp_container_register_with_compare

        ("cstring", netsnmp_container_get_factory("binary_array"),

         netsnmp_compare_direct_cstring);

    netsnmp_container_register_with_compare

        ("string", netsnmp_container_get_factory("binary_array"),

         netsnmp_compare_cstring);

    netsnmp_container_register_with_compare

        ("string_binary_array", netsnmp_container_get_factory("binary_array"),

         netsnmp_compare_cstring);

}

void

netsnmp_container_free_list(void)

{

    DEBUGMSGTL(("container", "netsnmp_container_free_list() called\n"));

    if (containers == NULL)

  return;

    /*

     * free memory used by each factory entry

     */

    CONTAINER_FOR_EACH(containers, ((netsnmp_container_obj_func *)_factory_free), NULL);

    /*

     * free factory container

     */

    CONTAINER_FREE(containers);

    containers = NULL;

}

int

netsnmp_container_register_with_compare(const char* name, netsnmp_factory *f,

                                        netsnmp_container_compare  *c)

{

    container_type *ct, tmp;

    if (NULL==containers)

        return -1;

    tmp.name = NETSNMP_REMOVE_CONST(char *, name);

    ct = (container_type *)CONTAINER_FIND(containers, &tmp);

    if (NULL!=ct) {

        DEBUGMSGT(("container_registry",

                   "replacing previous container factory\n"));

        ct->factory = f;

    }

    else {

        ct = SNMP_MALLOC_TYPEDEF(container_type);

        if (NULL == ct)

            return -1;

        ct->name = strdup(name);

        ct->factory = f;

        ct->compare = c;

        CONTAINER_INSERT(containers, ct);

    }

    DEBUGMSGT(("container_registry", "registered container factory %s (%s)\n",

               ct->name, f->product));

    return 0;

}

int

netsnmp_container_register(const char* name, netsnmp_factory *f)

{

    return netsnmp_container_register_with_compare(name, f, NULL);

}

/*------------------------------------------------------------------

 */

netsnmp_factory *

netsnmp_container_get_factory(const char *type)

{

    container_type ct, *found;

    if (NULL==containers)

        return NULL;

    ct.name = type;

    found = (container_type *)CONTAINER_FIND(containers, &ct);

    return found ? found->factory : NULL;

}

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_FIND_FACTORY

netsnmp_factory *

netsnmp_container_find_factory(const char *type_list)

{

    netsnmp_factory   *f = NULL;

    char              *list, *entry;

    char              *st = NULL;

    if (NULL==type_list)

        return NULL;

    list = strdup(type_list);

    if (!list)

        return NULL;

    entry = strtok_r(list, ":", &st);

    while (entry) {

        f = netsnmp_container_get_factory(entry);

        if (NULL != f)

            break;

        entry = strtok_r(NULL, ":", &st);

    }

    free(list);

    return f;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_FIND_FACTORY */

/*------------------------------------------------------------------

 */

static container_type *

netsnmp_container_get_ct(const char *type)

{

    container_type ct;

    if (NULL == containers)

        return NULL;

    ct.name = type;

    return (container_type *)CONTAINER_FIND(containers, &ct);

}

static container_type *

netsnmp_container_find_ct(const char *type_list)

{

    container_type    *ct = NULL;

    char              *list, *entry;

    char              *st = NULL;

    if (NULL==type_list)

        return NULL;

    list = strdup(type_list);

    if (!list)

        return NULL;

    entry = strtok_r(list, ":", &st);

    while (entry) {

        ct = netsnmp_container_get_ct(entry);

        if (NULL != ct)

            break;

        entry = strtok_r(NULL, ":", &st);

    }

    free(list);

    return ct;

}

/*------------------------------------------------------------------

 */

netsnmp_container *

netsnmp_container_get(const char *type)

{

    netsnmp_container *c;

    container_type *ct = netsnmp_container_get_ct(type);

    if (ct) {

        c = (netsnmp_container *)(ct->factory->produce());

        if (c && ct->compare)

            c->compare = ct->compare;

        return c;

    }

    return NULL;

}

/**

 * Allocate a new container of a given type.

 *

 * @param type A colon-separated string with the container name, followed by

 * a colon-separated list of container types.

 *

 * Creates a new container. The type of the container is the first type

 * mentioned in @type for which a factory has been registered with

 * netsnmp_container_register_with_compare() or netsnmp_container_register().

 */

netsnmp_container *

netsnmp_container_find(const char *type)

{

    container_type *ct = netsnmp_container_find_ct(type);

    netsnmp_container *c = ct ? (netsnmp_container *)(ct->factory->produce()) : NULL;

    /*

     * provide default compare and ncompare

     */

    if (c) {

        if (ct->compare)

            c->compare = ct->compare;

        else if (NULL == c->compare)

            c->compare = netsnmp_compare_netsnmp_index;

        if (NULL == c->ncompare)

            c->ncompare = netsnmp_ncompare_netsnmp_index;

    }

    return c;

}

/*------------------------------------------------------------------

 */

void

netsnmp_container_add_index(netsnmp_container *primary,

                            netsnmp_container *new_index)

{

    netsnmp_container *curr = primary;

    if((NULL == new_index) || (NULL == primary)) {

        snmp_log(LOG_ERR, "add index called with null pointer\n");

        return;

    }

    while(curr->next)

        curr = curr->next;

    curr->next = new_index;

    new_index->prev = curr;

}

int CONTAINER_INSERT_HELPER(netsnmp_container* x, const void* k)

{

    while(x && x->insert_filter && x->insert_filter(x,k) == 1)

        x = x->next;

    if(x) {

        int rc = x->insert(x,k);

        if(rc)

            snmp_log(LOG_DEBUG,"error on subcontainer '%s' insert (%d)\n",

                     x->container_name ? x->container_name : "", rc);

        else {

            rc = CONTAINER_INSERT_HELPER(x->next, k);

            if(rc)

                x->remove(x,k);

        }

        return rc;

    }

    return 0;

}

int CONTAINER_INSERT(netsnmp_container* x, const void* k)

{

    /** start at first container */

    while(x->prev)

        x = x->prev;

    return CONTAINER_INSERT_HELPER(x, k);

}

int CONTAINER_INSERT_BEFORE(netsnmp_container *x, size_t pos, void *k)

{

    int rc = 0;

    if (NULL == x || NULL == x->insert_before) {

        snmp_log(LOG_ERR, "container '%s' does not support insert_before\n",

                 x && x->container_name ? x->container_name : "");

        return -1;

    }

    rc = x->insert_before(x, pos, k);

    if (rc < 0)

        snmp_log(LOG_ERR, "error on container '%s' insert_before %" NETSNMP_PRIz "d (%d)\n",

                 x->container_name ? x->container_name : "", pos, rc);

    return rc;

}

int CONTAINER_REMOVE(netsnmp_container *x, const void *k)

{

    int rc2, rc = 0;

    /** start at last container */

    while(x->next)

        x = x->next;

    while(x) {

        rc2 = x->remove(x,k);

        /** ignore remove errors if there is a filter in place */

        if ((rc2) && (NULL == x->insert_filter)) {

            snmp_log(LOG_ERR,"error on subcontainer '%s' remove (%d)\n",

                     x->container_name ? x->container_name : "", rc2);

            rc = rc2;

        }

        x = x->prev;

    }

    return rc;

}

int CONTAINER_REMOVE_AT(netsnmp_container *x, size_t pos, void **k)

{

    int rc = 0;

    netsnmp_container *orig = x;

    if (NULL == x || NULL == x->remove_at) {

        snmp_log(LOG_ERR, "container '%s' does not support REMOVE_AT\n",

                 x && x->container_name ? x->container_name : "");

        return -1;

    }

    /** start at given container */

    rc = x->remove_at(x, pos, k);

    if (rc < 0) {

        snmp_log(LOG_ERR, "error on container '%s' remove_at %" NETSNMP_PRIz "d (%d)\n",

                 x->container_name ? x->container_name : "", pos, rc);

        return rc;

    } else if (NULL == k || NULL == *k)

        return rc;

    /** remove k from any other containers */

    while(x->prev)

        x = x->prev;

    for(; x; x = x->next) {

        if (x == orig)

            continue;

        x->remove(x,*k); /** ignore remove errors in other containers */

    }

    return rc;

}

int CONTAINER_GET_AT(netsnmp_container *x, size_t pos, void **k)

{

    int rc = 0;

    if (NULL == x || NULL == x->get_at) {

        snmp_log(LOG_ERR, "container '%s' does not support GET_AT\n",

                 x && x->container_name ? x->container_name : "");

        return -1;

    }

    /** start at given container */

    rc = x->get_at(x, pos, k);

    if (rc < 0)

        snmp_log(LOG_ERR, "error on container '%s' get_at %" NETSNMP_PRIz "d (%d)\n",

                 x->container_name ? x->container_name : "", pos, rc);

    return rc;

}

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_DUP

netsnmp_container *CONTAINER_DUP(netsnmp_container *x, void *ctx, u_int flags)

{

    if (NULL == x->duplicate) {

        snmp_log(LOG_ERR, "container '%s' does not support duplicate\n",

                 x->container_name ? x->container_name : "");

        return NULL;

    }

    return x->duplicate(x, ctx, flags);

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_DUP */

int CONTAINER_FREE(netsnmp_container *x)

{

    int  rc2, rc = 0;

    if (!x)

        return rc;

    /** start at last container */

    while(x->next)

        x = x->next;

    while(x) {

        netsnmp_container *tmp;

        char *name;

        tmp = x->prev;

        name = x->container_name;

        x->container_name = NULL;

        rc2 = x->cfree(x);

        if (rc2) {

            snmp_log(LOG_ERR,"error on subcontainer '%s' cfree (%d)\n",

                     name ? name : "", rc2);

            rc = rc2;

        }

        SNMP_FREE(name);

        x = tmp;

    }

    return rc;

}

/*

 * clear all containers. When clearing the *first* container, and

 * *only* the first container, call the function f for each item.

 * After calling this function, all containers should be empty.

 */

void CONTAINER_CLEAR(netsnmp_container *x, netsnmp_container_obj_func *f,

                    void *c)

{

    /** start at last container */

    while(x->next)

        x = x->next;

    while(x->prev) {

        x->clear(x, NULL, c);

        x = x->prev;

    }

    x->clear(x, f, c);

}

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_FREE_ALL

/*

 * clear all containers. When clearing the *first* container, and

 * *only* the first container, call the free_item function for each item.

 * After calling this function, all containers should be empty.

 */

void CONTAINER_FREE_ALL(netsnmp_container *x, void *c)

{

    CONTAINER_CLEAR(x, x->free_item, c);

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_FREE_ALL */

#ifndef NETSNMP_FEATURE_REMOVE_SUBCONTAINER_FIND

/*

 * Find a sub-container with the given name

 */

netsnmp_container *SUBCONTAINER_FIND(netsnmp_container *x,

                                     const char* name)

{

    if ((NULL == x) || (NULL == name))

        return NULL;

    /** start at first container */

    while(x->prev)

        x = x->prev;

    while(x) {

        if ((NULL != x->container_name) && (0 == strcmp(name,x->container_name)))

            break;

        x = x->next;

    }

    return x;

}

#endif /* NETSNMP_FEATURE_REMOVE_SUBCONTAINER_FIND */

/*------------------------------------------------------------------

 */

void

netsnmp_init_container(netsnmp_container         *c,

                       netsnmp_container_rc      *init,

                       netsnmp_container_rc      *cfree,

                       netsnmp_container_size    *size,

                       netsnmp_container_compare *cmp,

                       netsnmp_container_op      *ins,

                       netsnmp_container_op      *rem,

                       netsnmp_container_rtn     *fnd)

{

    if (c == NULL)

        return;

    c->init = init;

    c->cfree = cfree;

    c->get_size = size;

    c->compare = cmp;

    c->insert = ins;

    c->remove = rem;

    c->find = fnd;

    c->free_item = netsnmp_container_simple_free;

}

int

netsnmp_container_data_dup(netsnmp_container *dup, netsnmp_container *c)

{

    if (!dup || !c)

        return -1;

    if (c->container_name)

        dup->container_name = strdup(c->container_name);

    dup->compare = c->compare;

    dup->ncompare = c->ncompare;

    dup->release = c->release;

    dup->insert_filter = c->insert_filter;

    dup->free_item = c->free_item;

    dup->sync = c->sync;

    dup->flags = c->flags;

    return 0;

}

/*------------------------------------------------------------------

 *

 * simple comparison routines

 *

 */

int

netsnmp_compare_netsnmp_index(const void *lhs_arg, const void *rhs_arg)

{

    const netsnmp_index *lhs = lhs_arg;

    const netsnmp_index *rhs = rhs_arg;

    int rc;

    netsnmp_assert(lhs && rhs);

    DEBUGIF("compare:index") {

        DEBUGMSGT(("compare:index", "compare "));

        DEBUGMSGSUBOID(("compare:index", lhs->oids, lhs->len));

        DEBUGMSG(("compare:index", " to "));

        DEBUGMSGSUBOID(("compare:index", rhs->oids, rhs->len));

        DEBUGMSG(("compare:index", "\n"));

    }

    rc = snmp_oid_compare(lhs->oids, lhs->len, rhs->oids, rhs->len);

    DEBUGMSGT(("compare:index", "result was %d\n", rc));

    return rc;

}

int

netsnmp_ncompare_netsnmp_index(const void *lhs_arg, const void *rhs_arg)

{

    const netsnmp_index *lhs = lhs_arg;

    const netsnmp_index *rhs = rhs_arg;

    int rc;

    netsnmp_assert(lhs && rhs);

    DEBUGIF("compare:index") {

        DEBUGMSGT(("compare:index", "compare "));

        DEBUGMSGSUBOID(("compare:index", lhs->oids, lhs->len));

        DEBUGMSG(("compare:index", " to "));

        DEBUGMSGSUBOID(("compare:index", rhs->oids, rhs->len));

        DEBUGMSG(("compare:index", "\n"));

    }

    rc = snmp_oid_ncompare(lhs->oids, lhs->len, rhs->oids, rhs->len, rhs->len);

    DEBUGMSGT(("compare:index", "result was %d\n", rc));

    return rc;

}

int

netsnmp_compare_cstring(const void *lhs_arg, const void *rhs_arg)

{

    const container_type *lhs = lhs_arg;

    const container_type *rhs = rhs_arg;

    return strcmp(lhs->name, rhs->name);

}

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_NCOMPARE_CSTRING

int

netsnmp_ncompare_cstring(const void *lhs_arg, const void *rhs_arg)

{

    const container_type *lhs = lhs_arg;

    const container_type *rhs = rhs_arg;

    return strncmp(lhs->name, rhs->name, strlen(rhs->name));

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_NCOMPARE_CSTRING */

int

netsnmp_compare_direct_cstring(const void * lhs, const void * rhs)

{

    return strcmp(lhs, rhs);

}

/*

 * compare two memory buffers

 *

 * since snmp strings aren't NULL terminated, we can't use strcmp. So

 * compare up to the length of the smaller, and then use length to

 * break any ties.

 */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_MEM

int

netsnmp_compare_mem(const char * lhs, size_t lhs_len,

                    const char * rhs, size_t rhs_len)

{

    int rc, min = SNMP_MIN(lhs_len, rhs_len);

    rc = memcmp(lhs, rhs, min);

    return rc ? rc : lhs_len - rhs_len;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_MEM */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_LONG

int

netsnmp_compare_long(const void * lhs, const void * rhs)

{

    typedef struct { long index; } dummy;

    const dummy *lhd = (const dummy*)lhs;

    const dummy *rhd = (const dummy*)rhs;

    if (lhd->index < rhd->index)

        return -1;

    else if (lhd->index > rhd->index)

        return 1;

    return 0;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_LONG */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_ULONG

int

netsnmp_compare_ulong(const void * lhs, const void * rhs)

{

    typedef struct { u_long index; } dummy;

    const dummy *lhd = (const dummy*)lhs;

    const dummy *rhd = (const dummy*)rhs;

    if (lhd->index < rhd->index)

        return -1;

    else if (lhd->index > rhd->index)

        return 1;

    return 0;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_ULONG */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_INT32

int

netsnmp_compare_int32(const void * lhs, const void * rhs)

{

    typedef struct { int32_t index; } dummy;

    const dummy *lhd = (const dummy*)lhs;

    const dummy *rhd = (const dummy*)rhs;

    if (lhd->index < rhd->index)

        return -1;

    else if (lhd->index > rhd->index)

        return 1;

    return 0;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_INT32 */

#ifndef NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_UINT32

int

netsnmp_compare_uint32(const void * lhs, const void * rhs)

{

    typedef struct { uint32_t index; } dummy;

    const dummy *lhd = (const dummy*)lhs;

    const dummy *rhd = (const dummy*)rhs;

    if (lhd->index < rhd->index)

        return -1;

    else if (lhd->index > rhd->index)

        return 1;

    return 0;

}

#endif /* NETSNMP_FEATURE_REMOVE_CONTAINER_COMPARE_UINT32 */

/*------------------------------------------------------------------

 * netsnmp_container_simple_free

 *

 * useful function to pass to CONTAINER_FOR_EACH, when a simple

 * free is needed for every item.

 */

void 

netsnmp_container_simple_free(void *data, void *context)

{

    if (data == NULL)

  return;

    DEBUGMSGTL(("verbose:container",

                "netsnmp_container_simple_free) called for %p/%p\n",

                data, context));

    free(data); /* SNMP_FREE wasted on param */

}