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path: root/cleopatre/application/igmp_snoopd/src/data_struct.c
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#include "data_struct.h"

#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>

#include "libspid.h"

#include "internal.h"
#include "utils.h"

struct group *
find_group (const struct list_head_groups *groups_head, in_addr_t multicast_addr)
{
    struct group *grp;
    LIST_FOREACH (grp, groups_head, groups)
    {
        if (grp->multicast_addr == multicast_addr)
        {
            return grp;
        }
    }

    return NULL;
}

struct group_member *
find_member (const struct group *grp, const unsigned char eth_addr[ETH_ALEN])
{
    struct group_member *member;

    LIST_FOREACH (member, &grp->members_head, members)
    {
        if (memcmp (member->eth_addr, eth_addr, ETH_ALEN) == 0)
        {
            return member;
        }
    }

    return NULL;
}

struct group_member_source *
find_source (const struct group_member *member, in_addr_t source_addr)
{
    struct group_member_source *source;

    LIST_FOREACH (source, &member->sources_head, sources)
    {
        if (source->source_addr == source_addr)
        {
            return source;
        }
    }

    return NULL;
}

struct group *
add_group (struct list_head_groups *groups_head, in_addr_t multicast_addr)
{
    /* TODO: limit the number of groups/members/sources */

    struct group *grp;
    grp = malloc (sizeof (struct group));
    if (grp == NULL)
    {
        log_error ("malloc error");
        exit (EXIT_FAILURE);
    }

    grp->multicast_addr = multicast_addr;
    mcast_ip_to_eth_addr (multicast_addr, grp->mapped_eth_addr);
    grp->last_report_time = 0;
    grp->max_timer_end = 0;
    grp->v2_host_present_timer_end = 0;
    LIST_INIT (&grp->members_head);
    grp->member_count = 0;

    /* The list of groups is sorted by mapped_eth_addr.
     * This helps to identify groups that map to the same Ethernet MAC address
     * and require to create a union of their members when writing to the file. */
    struct group *g_prev = NULL;
    struct group *g_cur;

    LIST_FOREACH(g_cur, groups_head, groups)
    {
        if (CMP_MCAST_ETH_ADDR (grp->mapped_eth_addr, g_cur->mapped_eth_addr) < 0)
        {
            break;
        }

        g_prev = g_cur;
    }
    if (g_prev)
    {
        LIST_INSERT_AFTER (g_prev, grp, groups);
    }
    else
    {
        LIST_INSERT_HEAD (groups_head, grp, groups);
    }

    return grp;
}

struct group_member *
add_member (struct group *grp, const unsigned char eth_addr[ETH_ALEN])
{
    struct group_member * member;

    member = malloc (sizeof (struct group_member));
    if (member == NULL)
    {
        log_error ("malloc error");
        exit (EXIT_FAILURE);
    }
    memcpy (member->eth_addr, eth_addr, ETH_ALEN);

    /* By default, the safest supposition is Exclude {}.
     * This way, the host will receive more traffic that it wanted
     * but not less. */
    member->filter_mode = FILTER_MODE_EXCLUDE;

    member->last_report_time = 0;
    member->timer_end = 0;

    member->group = grp;

    LIST_INIT (&member->sources_head);

    /* The list of members is sorted by mac address.
     * This helps later when generating the file content. */
    struct group_member *m_prev = NULL;
    struct group_member *m_cur;

    LIST_FOREACH(m_cur, &grp->members_head, members)
    {
        if (memcmp (member->eth_addr, m_cur->eth_addr, ETH_ALEN) < 0)
        {
            break;
        }

        m_prev = m_cur;
    }
    if (m_prev)
    {
        LIST_INSERT_AFTER (m_prev, member, members);
    }
    else
    {
        LIST_INSERT_HEAD (&grp->members_head, member, members);
    }

    member->group->member_count++;

    return member;
}

void
add_source (struct group_member *member, in_addr_t source_addr)
{
    struct group_member_source *source;

    source = malloc (sizeof (struct group_member_source));
    if (source == NULL)
    {
        log_error ("malloc error");
        exit (EXIT_FAILURE); /* TODO: what todo in these cases ? */
    }

    source->source_addr = source_addr;

    /* maintain the list sorted ? */
    LIST_INSERT_HEAD (&member->sources_head, source, sources);
}

void
find_or_add (struct list_head_groups *groups_head,
             struct group **grp,
             in_addr_t multicast_addr,
             struct group_member **member,
             const unsigned char eth_addr[ETH_ALEN])
{
    *grp = find_group (groups_head, multicast_addr);
    if (*grp == NULL)
    {
        *grp = add_group (groups_head, multicast_addr);
    }

    *member = find_member (*grp, eth_addr);
    if (*member == NULL)
    {
        *member = add_member (*grp, eth_addr);
    }
}

/**
 * Clear the sources of a member.
 * \param  member  The member.
 */
static void
clear_sources (struct group_member *member)
{
    struct group_member_source *source = LIST_FIRST (&member->sources_head);
    while (source)
    {
        struct group_member_source *next_source = LIST_NEXT (source, sources);

        free (source);

        source = next_source;
    }

    LIST_INIT (&member->sources_head);
}

/**
 * Clear the members of a group.
 * \param  grp  The group.
 */
static void
clear_members (struct group *grp)
{
    struct group_member *member = LIST_FIRST (&grp->members_head);
    while (member)
    {
        struct group_member *next_member = LIST_NEXT (member, members);

        del_group_member (member);

        member = next_member;
    }

    LIST_INIT(&grp->members_head);
}

void
del_group_member (struct group_member *member)
{
    clear_sources (member);
    LIST_REMOVE (member, members);
    member->group->member_count--;
    free (member);
}

void
del_group (struct group *grp)
{
    clear_members (grp);
    LIST_REMOVE (grp, groups);
    free (grp);
}

void
group_member_set_sources (struct group_member *member, const in_addr_t *sources, uint16_t nsrcs)
{
    /* TODO:  compare instead of clearing then adding,
     * to detect changes and to avoid unnecessary recreation of the same list ? */
    clear_sources (member);

    uint16_t src_idx;
    for (src_idx = 0; src_idx < nsrcs; src_idx++)
    {
        add_source (member, sources[src_idx]);
    }
}

void
group_member_add_sources (struct group_member *member, const in_addr_t *sources, uint16_t nsrcs)
{
    uint16_t src_idx;
    for (src_idx = 0; src_idx < nsrcs; src_idx++)
    {
        struct group_member_source *src = find_source (member, sources[src_idx]);
        if (src == NULL)
        {
            add_source (member, sources[src_idx]);
        }
    }
}

void
group_member_del_sources (struct group_member *member, const in_addr_t *sources, uint16_t nsrcs)
{
    uint16_t src_idx;
    for (src_idx = 0; src_idx < nsrcs; src_idx++)
    {
        struct group_member_source *src = find_source (member, sources[src_idx]);

        if (src)
        {
            LIST_REMOVE (src, sources);
            free(src);
        }
    }
}

void
dump_groups (const struct list_head_groups *groups_head)
{
    struct group *grp;
    LIST_FOREACH (grp, groups_head, groups)
    {
        char mac_str[LIBSPID_MAC_STR_LEN];
        (void)libspid_mac_bin_to_str (grp->mapped_eth_addr, mac_str);
        char ip_str[INET_ADDRSTRLEN];
        inet_ntop (AF_INET, &grp->multicast_addr, ip_str, sizeof (ip_str));
        log_debug ("Group %s / %s", ip_str, mac_str);

        log_debug ("    Last Report Time: %lu",
                   (unsigned long)grp->last_report_time);
        log_debug ("    Max Timer End: %lu", (unsigned long)grp->max_timer_end);
        log_debug ("    V2 Host Present Timer End: %lu",
                   (unsigned long)grp->v2_host_present_timer_end);
        log_debug (" ");

        log_debug ("   %u member(s):", grp->member_count);

        struct group_member *member;
        LIST_FOREACH (member, &grp->members_head, members)
        {
            (void)libspid_mac_bin_to_str (member->eth_addr, mac_str);
            log_debug ("   Member %s", mac_str);
            log_debug ("     Last Report Time: %lu", (unsigned long)member->last_report_time);
            log_debug ("     Timer End: %lu", (unsigned long)member->timer_end);

            switch (member->filter_mode)
            {
            case FILTER_MODE_EXCLUDE:
                log_debug ("      EXCLUDE");
                break;

            case FILTER_MODE_INCLUDE:
                log_debug ("      INCLUDE");
                break;

            default:
                log_debug ("Error: Unknown filter_mode");
            }

            if (LIST_EMPTY (&member->sources_head))
            {
                log_debug ("      {}");
            }
            else
            {
                log_debug ("      {");
                struct group_member_source *source;
                LIST_FOREACH (source, &member->sources_head, sources)
                {
                    inet_ntop (AF_INET, &source->source_addr, ip_str, sizeof (ip_str));
                    log_debug ("        %s", ip_str);
                }
                log_debug ("      }");
            }
        }
        log_debug (" ");
    }
    log_debug (" ");
}