agent/mibgroup/ip-mib/data_access/scalars_linux.c

/*
 *  Arp MIB architecture support
 *
 * $Id$
 */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

#include <net-snmp/data_access/ip_scalars.h>

netsnmp_feature_require(register_num_file_instance)

static const char ipfw_name[] = "/proc/sys/net/ipv4/conf/all/forwarding";
static const char ipttl_name[] = "/proc/sys/net/ipv4/ip_default_ttl";
static const char ipfw6_name[] = "/proc/sys/net/ipv6/conf/all/forwarding";
static const char iphop6_name[] = "/proc/sys/net/ipv6/conf/all/hop_limit";

int
netsnmp_arch_ip_scalars_ipForwarding_get(u_long *value)
{
    FILE *filep;
    int rc;

    if (NULL == value)
        return -1;


    filep = fopen(ipfw_name, "r");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipForwarding", "could not open %s\n",
                    ipfw_name));
        return -2;
    }

    rc = fscanf(filep, "%lu", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipForwarding", "could not read %s\n",
                    ipfw_name));
        return -3;
    }

    if ((0 != *value) && (1 != *value)) {
        DEBUGMSGTL(("access:ipForwarding", "unexpected value %ld in %s\n",
                    *value, ipfw_name));
        return -4;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipForwarding_set(u_long value)
{
    FILE *filep;
    int rc;

    if (1 == value)
        ;
    else if (2 == value)
        value = 0;
    else {
        DEBUGMSGTL(("access:ipForwarding", "bad value %ld for %s\n",
                    value, ipfw_name));
        return SNMP_ERR_WRONGVALUE;
    }

    filep = fopen(ipfw_name, "w");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipForwarding", "could not open %s\n",
                    ipfw_name));
        return SNMP_ERR_RESOURCEUNAVAILABLE;
    }

    rc = fprintf(filep, "%ld", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipForwarding", "could not write %s\n",
                    ipfw_name));
        return SNMP_ERR_GENERR;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipDefaultTTL_get(u_long *value)
{
    FILE *filep;
    int rc;

    if (NULL == value)
        return -1;


    filep = fopen(ipttl_name, "r");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipDefaultTTL", "could not open %s\n",
                    ipttl_name));
        return -2;
    }

    rc = fscanf(filep, "%lu", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipDefaultTTL", "could not read %s\n",
                    ipttl_name));
        return -3;
    }

    if ((0 == *value) || (255 < *value)) {
        DEBUGMSGTL(("access:ipDefaultTTL", "unexpected value %ld in %s\n",
                    *value, ipttl_name));
        return -4;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipDefaultTTL_set(u_long value)
{
    FILE *filep;
    int rc;

    if (value == 0 || value > 255) {
        DEBUGMSGTL(("access:ipDefaultTTL", "bad value %ld for %s\n",
                    value, ipttl_name));
        return SNMP_ERR_WRONGVALUE;
    }

    filep = fopen(ipttl_name, "w");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipDefaultTTL", "could not open %s\n",
                    ipttl_name));
        return SNMP_ERR_RESOURCEUNAVAILABLE;
    }

    rc = fprintf(filep, "%ld", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipDefaultTTL", "could not write %s\n",
                    ipttl_name));
        return SNMP_ERR_GENERR;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipv6IpForwarding_get(u_long *value)
{
    FILE *filep;
    int rc;

    if (NULL == value)
        return -1;


    filep = fopen(ipfw6_name, "r");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipv6IpForwarding", "could not open %s\n",
                    ipfw6_name));
        return -2;
    }

    rc = fscanf(filep, "%lu", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipv6IpForwarding", "could not read %s\n",
                    ipfw6_name));
        return -3;
    }

    if ((0 != *value) && (1 != *value)) {
        DEBUGMSGTL(("access:ipv6IpForwarding", "unexpected value %ld in %s\n",
                    *value, ipfw6_name));
        return -4;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipv6IpForwarding_set(u_long value)
{
    FILE *filep;
    int rc;

    if (1 == value)
        ;
    else if (2 == value)
        value = 0;
    else {
        DEBUGMSGTL(("access:ipv6IpForwarding",
                    "bad value %ld for ipv6IpForwarding\n", value));
        return SNMP_ERR_WRONGVALUE;
    }

    filep = fopen(ipfw6_name, "w");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipv6IpForwarding", "could not open %s\n",
                    ipfw6_name));
        return SNMP_ERR_RESOURCEUNAVAILABLE;
    }

    rc = fprintf(filep, "%ld", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipv6IpForwarding", "could not write %s\n",
                    ipfw6_name));
        return SNMP_ERR_GENERR;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipv6IpDefaultHopLimit_get(u_long *value)
{
    FILE *filep;
    int rc;

    if (NULL == value)
        return -1;


    filep = fopen(iphop6_name, "r");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "could not open %s\n",
                    iphop6_name));
        return -2;
    }

    rc = fscanf(filep, "%lu", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "could not read %s\n",
                    iphop6_name));
        return -3;
    }

    if ((0 == *value) || (255 < *value)) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "unexpected value %ld in %s\n",
                    *value, iphop6_name));
        return -4;
    }

    return 0;
}

int
netsnmp_arch_ip_scalars_ipv6IpDefaultHopLimit_set(u_long value)
{
    FILE *filep;
    int rc;

    if (value == 0 || value > 255) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "bad value %ld for %s\n",
                    value, iphop6_name));
        return SNMP_ERR_WRONGVALUE;
    }

    filep = fopen(iphop6_name, "w");
    if (NULL == filep) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "could not open %s\n",
                    iphop6_name));
        return SNMP_ERR_RESOURCEUNAVAILABLE;
    }

    rc = fprintf(filep, "%ld", value);
    fclose(filep);
    if (1 != rc) {
        DEBUGMSGTL(("access:ipDefaultHopLimit", "could not write %s\n",
                    iphop6_name));
        return SNMP_ERR_GENERR;
    }

    return 0;
}

void
netsnmp_arch_ip_scalars_register_handlers(void)
{
    static oid ipReasmTimeout_oid[] = { 1, 3, 6, 1, 2, 1, 4, 13, 0 };

    netsnmp_register_num_file_instance
        ("ipReasmTimeout",
         ipReasmTimeout_oid, OID_LENGTH(ipReasmTimeout_oid),
         "/proc/sys/net/ipv4/ipfrag_time", ASN_INTEGER,
         HANDLER_CAN_RONLY, NULL, NULL);

}