interface_linux.c

snmp的源代码,已经在我的ubuntu下编译通过

                     scan_expected, scan_count);
            netsnmp_access_interface_entry_free(entry);
            continue;
        }
        entry->ns_flags |= NETSNMP_INTERFACE_FLAGS_ACTIVE;

        /*
         * linux previous to 1.3.~13 may miss transmitted loopback pkts: 
         */
        if (!strcmp(entry->name, "lo") && rec_pkt > 0 && !snd_pkt)
            snd_pkt = rec_pkt;

        /*
         * xxx-rks: get descr by linking mem from /proc/pci and /proc/iomem
         */


        entry->stats.ibytes.low = rec_oct & 0xffffffff;
        entry->stats.iucast.low = rec_pkt & 0xffffffff;
        entry->stats.imcast.low = rec_mcast & 0xffffffff;
        entry->stats.obytes.low = snd_oct & 0xffffffff;
        entry->stats.oucast.low = snd_pkt & 0xffffffff;
#ifdef SCNuMAX   /* XXX - should be flag for 64-bit variables */
        entry->stats.ibytes.high = rec_oct >> 32;
        entry->stats.iucast.high = rec_pkt >> 32;
        entry->stats.imcast.high = rec_mcast >> 32;
        entry->stats.obytes.high = snd_oct >> 32;
        entry->stats.oucast.high = snd_pkt >> 32;
#endif
        entry->stats.ierrors   = rec_err;
        entry->stats.idiscards = rec_drop;
        entry->stats.oerrors   = snd_err;
        entry->stats.odiscards = snd_drop;
        entry->stats.collisions = coll;

        /*
         * calculated stats.
         *
         *  we have imcast, but not ibcast.
         */
        entry->stats.inucast = entry->stats.imcast.low +
            entry->stats.ibcast.low;

        /*
         * use ioctls for some stuff
         *  (ignore rc, so we get as much info as possible)
         */
        netsnmp_access_interface_ioctl_physaddr_get(fd, entry);

        /*
         * physaddr should have set type. make some guesses (based
         * on name) if not.
         */
        if(0 == entry->type) {
            typedef struct _match_if {
               int             mi_type;
               const char     *mi_name;
            }              *pmatch_if, match_if;
            
            static match_if lmatch_if[] = {
                {IANAIFTYPE_SOFTWARELOOPBACK, "lo"},
                {IANAIFTYPE_ETHERNETCSMACD, "eth"},
                {IANAIFTYPE_ETHERNETCSMACD, "vmnet"},
                {IANAIFTYPE_ISO88025TOKENRING, "tr"},
                {IANAIFTYPE_FASTETHER, "feth"},
                {IANAIFTYPE_GIGABITETHERNET,"gig"},
                {IANAIFTYPE_PPP, "ppp"},
                {IANAIFTYPE_SLIP, "sl"},
                {IANAIFTYPE_TUNNEL, "sit"},
                {IANAIFTYPE_BASICISDN, "ippp"},
                {IANAIFTYPE_PROPVIRTUAL, "bond"}, /* Bonding driver find fastest slave */
                {IANAIFTYPE_PROPVIRTUAL, "vad"},  /* ANS driver - ?speed? */
                {0, 0}                  /* end of list */
            };

            int             ii, len;
            register pmatch_if pm;
            
            for (ii = 0, pm = lmatch_if; pm->mi_name; pm++) {
                len = strlen(pm->mi_name);
                if (0 == strncmp(entry->name, pm->mi_name, len)) {
                    entry->type = pm->mi_type;
                    break;
                }
            }
            if(NULL == pm->mi_name)
                entry->type = IANAIFTYPE_OTHER;
        }

        if (IANAIFTYPE_ETHERNETCSMACD == entry->type)
            entry->speed =
                netsnmp_arch_interface_get_if_speed(fd, entry->name);
#ifdef APPLIED_PATCH_836390   /* xxx-rks ifspeed fixes */
        else if (IANAIFTYPE_PROPVIRTUAL == entry->type)
            entry->speed = _get_bonded_if_speed(entry)
#endif
        else
            netsnmp_access_interface_entry_guess_speed(entry);

        netsnmp_access_interface_ioctl_flags_get(fd, entry);

        netsnmp_access_interface_ioctl_mtu_get(fd, entry);

        /*
         * Zero speed means link problem.
         * -i'm not sure this is always true...
         */
        if((entry->speed == 0) && (entry->os_flags & IFF_UP)){
            entry->os_flags &= ~IFF_RUNNING;
        }

        netsnmp_access_interface_entry_overrides(entry);

        /*
         * add to container
         */
        CONTAINER_INSERT(container, entry);
    }
    fclose(devin);
    close(fd);
    return 0;
}

int
netsnmp_arch_set_admin_status(netsnmp_interface_entry * entry,
                              int ifAdminStatus_val)
{
    int and_complement;
    
    DEBUGMSGTL(("access:interface:arch", "set_admin_status\n"));

    if(IFADMINSTATUS_UP == ifAdminStatus_val)
        and_complement = 0; /* |= */
    else
        and_complement = 1; /* &= ~ */

    return netsnmp_access_interface_ioctl_flags_set(-1, entry,
                                                    IFF_UP, and_complement);
}


/**
 * Determines network interface speed.
 */
unsigned int
netsnmp_arch_interface_get_if_speed(int fd, const char *name)
{
    unsigned int retspeed = 10000000;
    struct ifreq ifr;

    /* the code is based on mii-diag utility by Donald Becker
     * see ftp://ftp.scyld.com/pub/diag/mii-diag.c
     */
    ushort *data = (ushort *)(&ifr.ifr_data);
    unsigned phy_id;
    unsigned char new_ioctl_nums = 0;
    int mii_reg, i;
    ushort mii_val[32];
    ushort bmcr, bmsr, nway_advert, lkpar;
    const unsigned int media_speeds[] = {10000000, 10000000, 100000000, 100000000, 10000000, 0};	
    /* It corresponds to "10baseT", "10baseT-FD", "100baseTx", "100baseTx-FD", "100baseT4", "Flow-control", 0, */

    strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    ifr.ifr_name[ sizeof(ifr.ifr_name)-1 ] = 0;
    data[0] = 0;
    
    if (ioctl(fd, 0x8947, &ifr) >= 0) {
        new_ioctl_nums = 1;
    } else if (ioctl(fd, SIOCDEVPRIVATE, &ifr) >= 0) {
        new_ioctl_nums = 0;
    } else {
        DEBUGMSGTL(("mibII/interfaces", "SIOCGMIIPHY on %s failed\n",
                    ifr.ifr_name));
        return retspeed;
    }

    /* Begin getting mii register values */
    phy_id = data[0];
    for (mii_reg = 0; mii_reg < 8; mii_reg++){
        data[0] = phy_id;
        data[1] = mii_reg;
        if(ioctl(fd, new_ioctl_nums ? 0x8948 : SIOCDEVPRIVATE+1, &ifr) <0){
            DEBUGMSGTL(("mibII/interfaces", "SIOCGMIIREG on %s failed\n", ifr.ifr_name));
        }
        mii_val[mii_reg] = data[3];		
    }
    /*Parsing of mii values*/
    /*Invalid basic mode control register*/
    if (mii_val[0] == 0xffff  ||  mii_val[1] == 0x0000) {
        DEBUGMSGTL(("mibII/interfaces", "No MII transceiver present!.\n"));
        return retspeed;
    }
    /* Descriptive rename. */
    bmcr = mii_val[0]; 	  /*basic mode control register*/
    bmsr = mii_val[1]; 	  /* basic mode status register*/
    nway_advert = mii_val[4]; /* autonegotiation advertisement*/
    lkpar = mii_val[5]; 	  /*link partner ability*/
    
    /*Check for link existence, returns 0 if link is absent*/
    if ((bmsr & 0x0016) != 0x0004){
        DEBUGMSGTL(("mibII/interfaces", "No link...\n"));
        retspeed = 0;
        return retspeed;
    }
    
    if(!(bmcr & 0x1000) ){
        DEBUGMSGTL(("mibII/interfaces", "Auto-negotiation disabled.\n"));
        retspeed = bmcr & 0x2000 ? 100000000 : 10000000;
        return retspeed;
    }
    /* Link partner got our advertised abilities */	
    if (lkpar & 0x4000) {
        int negotiated = nway_advert & lkpar & 0x3e0;
        int max_capability = 0;
        /* Scan for the highest negotiated capability, highest priority
           (100baseTx-FDX) to lowest (10baseT-HDX). */
        int media_priority[] = {8, 9, 7, 6, 5}; 	/* media_names[i-5] */
        for (i = 0; media_priority[i]; i++){
            if (negotiated & (1 << media_priority[i])) {
                max_capability = media_priority[i];
                break;
            }
        }
        if (max_capability)
            retspeed = media_speeds[max_capability - 5];
        else
            DEBUGMSGTL(("mibII/interfaces", "No common media type was autonegotiated!\n"));
    }else if(lkpar & 0x00A0){
        retspeed = (lkpar & 0x0080) ? 100000000 : 10000000;
    }
    return retspeed;
}