mbtk/libmbtk_lib/net/mbtk_ifc.c

/*
* MBTK Network Interface control.
*
* Author : lb
* Date   : 2021/8/20 11:44:05
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
//#include <net/if.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <linux/sockios.h>
//#include <cutils/properties.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <linux/route.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include "mbtk_type.h"
#include "mbtk_log.h"
#include "mbtk_utils.h"
#include "mbtk_ifc.h"

#define IFNAMSIZ    16

static int ifc_ctl_sock = -1;
static pthread_mutex_t ifc_sock_mutex = PTHREAD_MUTEX_INITIALIZER;

static void ifc_init_ifr(const char *name, struct ifreq *ifr)
{
    memset(ifr, 0, sizeof(struct ifreq));
    strncpy(ifr->ifr_name, name, IFNAMSIZ);
    ifr->ifr_name[IFNAMSIZ - 1] = 0;
}

static int ifc_set_flags(int sock, const char *name, unsigned set, unsigned clr)
{
    struct ifreq ifr;
    ifc_init_ifr(name, &ifr);

    if(ioctl(sock, SIOCGIFFLAGS, &ifr) < 0)
        return -1;
    ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;
    return ioctl(sock, SIOCSIFFLAGS, &ifr);
}

static void init_sockaddr_in(struct sockaddr *sa, in_addr_t addr)
{
    struct sockaddr_in *sin = (struct sockaddr_in *) sa;
    sin->sin_family = AF_INET;
    sin->sin_port = 0;
    sin->sin_addr.s_addr = addr;
}

#if 1
static const char *ipaddr_to_string(in_addr_t addr)
{
    struct in_addr in_addr;

    in_addr.s_addr = addr;
    return inet_ntoa(in_addr);
}
#endif

static in_addr_t prefixLengthToIpv4Netmask(int prefix_length)
{
    in_addr_t mask = 0;

    // C99 (6.5.7): shifts of 32 bits have undefined results
    if (prefix_length <= 0 || prefix_length > 32)
    {
        return 0;
    }

    mask = ~mask << (32 - prefix_length);
    mask = htonl(mask);

    return mask;
}

#if 1
static int ifc_set_prefixLength(const char *name, int prefixLength)
{
    struct ifreq ifr;
    // TODO - support ipv6
//    if (prefixLength > 32 || prefixLength < 0) return -1;

    in_addr_t mask = prefixLengthToIpv4Netmask(prefixLength);
    ifc_init_ifr(name, &ifr);
    init_sockaddr_in(&ifr.ifr_addr, mask);

    return ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
}
#endif

int ifc_act_on_ipv4_route(int action, const char *ifname, struct in_addr dst, int prefix_length,
                          struct in_addr gw)
{
    struct rtentry rt;
    int result;
    in_addr_t netmask;

    memset(&rt, 0, sizeof(rt));

    rt.rt_dst.sa_family = AF_INET;
    rt.rt_dev = (void*) ifname;

    netmask = prefixLengthToIpv4Netmask(prefix_length);
    init_sockaddr_in(&rt.rt_genmask, netmask);
    init_sockaddr_in(&rt.rt_dst, dst.s_addr);
    rt.rt_flags = RTF_UP;

    if (prefix_length == 32)
    {
        rt.rt_flags |= RTF_HOST;
    }

    if (gw.s_addr != 0)
    {
        rt.rt_flags |= RTF_GATEWAY;
        init_sockaddr_in(&rt.rt_gateway, gw.s_addr);
    }

    result = ioctl(ifc_ctl_sock, action, &rt);
    if (result < 0)
    {
        if (errno == EEXIST)
        {
            result = 0;
        }
        else
        {
            result = -errno;
        }
    }
    return result;
}

static int ifc_create_default_route1(const char *name, in_addr_t gw)
{
    struct in_addr in_dst, in_gw;

    in_dst.s_addr = 0;
    in_gw.s_addr = gw;

    int ret = ifc_act_on_ipv4_route(SIOCADDRT, name, in_dst, 0, in_gw);
    LOGD("ifc_create_default_route(%s, %d) = %d", name, gw, ret);
    return ret;
}

/* deprecated - v4 only */
static int ifc_create_default_route2(const char *name, const char *gw)
{
    struct in_addr in_dst, in_gw;

    in_dst.s_addr = 0;
    if(gw == NULL)
    {
        in_gw.s_addr = 0;
    }
    else
    {
        if(inet_aton(gw,(struct in_addr *)&(in_gw.s_addr)) < 0)
        {
            LOGE("inet_aton error.");
            return -1;
        }
    }

    int ret = ifc_act_on_ipv4_route(SIOCADDRT, name, in_dst, 0, in_gw);
    LOGD("ifc_create_default_route(%s) = %d", name, ret);
    return ret;
}

int mbtk_ifc_open(void)
{
    pthread_mutex_lock(&ifc_sock_mutex);
    if (ifc_ctl_sock == -1)
    {
        ifc_ctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
        if (ifc_ctl_sock < 0)
        {
            LOGE("socket() failed: %s\n", strerror(errno));
        }
    }

    return ifc_ctl_sock < 0 ? -1 : 0;
}

int mbtk_ifc_close(void)
{
    if (ifc_ctl_sock != -1)
    {
        (void)close(ifc_ctl_sock);
        ifc_ctl_sock = -1;
    }
    pthread_mutex_unlock(&ifc_sock_mutex);

    return 0;
}

int mbtk_ifc_set_addr(const char *name, in_addr_t addr, in_addr_t netmask)
{
    struct ifreq ifr, irf_mask;
    int ret;

    ifc_init_ifr(name, &ifr);
    init_sockaddr_in(&ifr.ifr_addr, addr);

    ret = ioctl(ifc_ctl_sock, SIOCSIFADDR, &ifr);
    if(ret)
    {
        LOGD("set_addr(%s, %x) = %d fail.", name, addr, ret);
    }

    if(netmask)
    {
        ifc_init_ifr(name, &irf_mask);
        init_sockaddr_in(&irf_mask.ifr_netmask, netmask);
        ret = ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &irf_mask);
        if(ret)
        {
            LOGD("set_netmask(%s, %x) = %d fail.", name, netmask, ret);
        }
    }

    return ret;
}

int mbtk_ifc_ip_config(const char *ifname, const char *ipv4, const char *mask, const char *gateway)
{
    UNUSED(gateway);
    struct ifreq ifr;

//    struct rtentry  rt;
    // Set IPv4
    struct sockaddr_in *sin;
    memset(&ifr,0,sizeof(ifr));
    strcpy(ifr.ifr_name,ifname);
    sin = (struct sockaddr_in*)&ifr.ifr_addr;
    sin->sin_family = AF_INET;
    if(ipv4) {
        if(inet_aton(ipv4,&(sin->sin_addr)) < 0)
        {
            LOGE("inet_aton error.");
            return -2;
        }
    } else {
        memset(&(sin->sin_addr), 0, sizeof(struct in_addr));
    }

    if(ioctl(ifc_ctl_sock,SIOCSIFADDR,&ifr) < 0)
    {
        LOGE("ioctl SIOCSIFADDR error.");
        return -3;
    }

#if 1
#if 1
    //netmask
    if(mask) {
        if(inet_aton(mask,&(sin->sin_addr)) < 0)
        {
            LOGE("inet_pton error.");
            return -4;
        }

        if(ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr) < 0)
        {
            LOGE("ioctl error.");
            return -5;
        }
    }
#else

    //struct ifreq ifr;
    //strcpy(ifr.ifr_name, interface_name);
    struct sockaddr_in netmask_addr;
    bzero(&netmask_addr, sizeof(struct sockaddr_in));
    netmask_addr.sin_family = PF_INET;
    inet_aton(mask, &netmask_addr.sin_addr);
    memcpy(&ifr.ifr_ifru.ifru_netmask, &netmask_addr,
           sizeof(struct sockaddr_in));
    if (ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr) < 0)
    {
        LOGE("ioctl() fail.");
        return -1;
    }
#endif
#endif

#if 0
    //gateway
    memset(&rt, 0, sizeof(struct rtentry));
    memset(sin, 0, sizeof(struct sockaddr_in));
    sin->sin_family = AF_INET;
    sin->sin_port = 0;
    if(inet_aton(gateway, &sin->sin_addr)<0)
    {
        LOGE( "inet_aton error." );
    }
    memcpy ( &rt.rt_gateway, sin, sizeof(struct sockaddr_in));
    ((struct sockaddr_in *)&rt.rt_dst)->sin_family=AF_INET;
    ((struct sockaddr_in *)&rt.rt_genmask)->sin_family=AF_INET;
    rt.rt_flags = RTF_GATEWAY;
    if (ioctl(ifc_ctl_sock, SIOCADDRT, &rt)<0)
    {
        LOGE("ioctl(SIOCADDRT) error in set_default_route\n");
        return -1;
    }
#endif
    return 0;
}

int mbtk_ifc_set_netmask(const char *ifname, const char *netmask)
{
    int s;
    if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0)
    {
        LOGE("Socket");
        return -1;
    }
    struct ifreq ifr;
    strcpy(ifr.ifr_name, ifname);
    struct sockaddr_in netmask_addr;
    bzero(&netmask_addr, sizeof(struct sockaddr_in));
    netmask_addr.sin_family = PF_INET;
    inet_aton(netmask, &netmask_addr.sin_addr);
    memcpy(&ifr.ifr_ifru.ifru_netmask, &netmask_addr,
           sizeof(struct sockaddr_in));
    if (ioctl(s, SIOCSIFNETMASK, &ifr) < 0)
    {
        LOGE("ioctl");
        close(s);
        return -1;
    }
    close(s);
    return 0;
}


int mbtk_ifc_get_addr(const char *name, void *addr)
{
    int ret;
    struct ifreq ifr;
    ifc_init_ifr(name, &ifr);

    ret = ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr);
    LOGD("ifc_get_addr(%s, %x) = %d", name, ifr.ifr_addr, ret);
    if(ret < 0) return -1;

    memcpy(addr, &ifr.ifr_addr, sizeof(struct sockaddr));
    return 0;
}


int mbtk_ifc_up(const char *name)
{
    int ret = ifc_set_flags(ifc_ctl_sock, name, IFF_UP, 0);
//    LOGI("mbtk_ifc_up(%s) = %d", name, ret);
    return ret;
}

int mbtk_ifc_down(const char *name)
{
    int ret = ifc_set_flags(ifc_ctl_sock, name, 0, IFF_UP);
//    LOGI("mbtk_ifc_down(%s) = %d", name, ret);
    return ret;
}

int mbtk_ifc_get_hwaddr(const char *name, void *ptr)
{
    int r;
    struct ifreq ifr;
    ifc_init_ifr(name, &ifr);

    r = ioctl(ifc_ctl_sock, SIOCGIFHWADDR, &ifr);
    if(r < 0) return -1;

    memcpy(ptr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
    return 0;
}

int mbtk_ifc_get_ifindex(const char *name, int *if_indexp)
{
    int r;
    struct ifreq ifr;
    ifc_init_ifr(name, &ifr);

    r = ioctl(ifc_ctl_sock, SIOCGIFINDEX, &ifr);
    if(r < 0) return -1;

    *if_indexp = ifr.ifr_ifindex;
    return 0;
}

int mbtk_ifc_configure1(const char *ifname,
                        in_addr_t address,
                        uint32_t prefixLength,
                        in_addr_t gateway,
                        in_addr_t netmask)
{
    if(mbtk_ifc_open())
    {
        LOGE("mbtk_ifc_open() fail.", strerror(errno));
        return -1;
    }

    if (mbtk_ifc_up(ifname))
    {
        LOGE("failed to turn on interface %s: %s", ifname, strerror(errno));
        mbtk_ifc_close();
        return -1;
    }
    if (mbtk_ifc_set_addr(ifname, address, netmask))
    {
        LOGE("failed to set ipaddr %s: %s", ipaddr_to_string(address), strerror(errno));
        mbtk_ifc_close();
        return -1;
    }
    if (ifc_set_prefixLength(ifname, prefixLength))
    {
        LOGE("failed to set prefixLength %d: %s", prefixLength, strerror(errno));
        mbtk_ifc_close();
        return -1;
    }
    if (ifc_create_default_route1(ifname, gateway))
    {
        LOGE("failed to set default route %s: %s", ipaddr_to_string(gateway), strerror(errno));
        mbtk_ifc_close();
        return -1;
    }

    mbtk_ifc_close();
    return 0;
}

int mbtk_ifc_configure2(const char *ifname,
                        const char *ipv4,
                        uint32_t prefixLength,
                        const char *gateway,
                        const char *netmask)
{
    if(mbtk_ifc_open())
    {
        LOGE("mbtk_ifc_open() fail.", strerror(errno));
        return -1;
    }

    if(ipv4 == NULL) {
        if (mbtk_ifc_down(ifname))
        {
            LOGE("failed to turn off interface %s: %s", ifname, strerror(errno));
            mbtk_ifc_close();
            return -1;
        }
    } else {
        if (mbtk_ifc_up(ifname))
        {
            LOGE("failed to turn on interface %s: %s", ifname, strerror(errno));
            mbtk_ifc_close();
            return -1;
        }
    }

    if (mbtk_ifc_ip_config(ifname, ipv4, netmask, gateway))
    {
        LOGE("failed to set ipaddr: %s", strerror(errno));
        mbtk_ifc_close();
        return -1;
    }

//    mbtk_ifc_set_netmask(ifname, netmask);

#if 0
    if (ifc_set_prefixLength(ifname, prefixLength))
    {
        LOGE("failed to set prefixLength %d: %s", prefixLength, strerror(errno));
        mbtk_ifc_close();
        return -1;
    }
#endif

#if 0
    if (ifc_create_default_route2(ifname, gateway))
    {
        LOGE("failed to set default route: %s", strerror(errno));
        mbtk_ifc_close();
        return -1;
    }
#endif

    mbtk_ifc_close();

    return 0;
}

struct in6_ifreq {
    struct in6_addr addr;
    uint32_t        prefixlen;
    unsigned int    ifindex;
};

int mbtk_ipv6_config(const char *ifname, const char *ipv6, uint32_t prefixLength)
{
    struct ifreq ifr;
    struct in6_ifreq ifr6;
    int sockfd;
    int err = 0;

    // Create IPv6 socket to perform the ioctl operations on
    sockfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP);
    if(sockfd < 0) {
        LOGE("socket() fail.[%d]", errno);
        return -1;
    }

    if(ipv6) {
        if(ifc_set_flags(sockfd, ifname, IFF_UP, 0) < 0) {
            LOGE("if up fail[%d].", errno);
            err = -1;
            goto exit;
        }

        // Copy the interface name to the ifreq struct
        strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
        // Get the ifrindex of the interface
        if(ioctl(sockfd, SIOGIFINDEX, &ifr) < 0)
        {
            LOGE("ioctl SIOGIFINDEX error.");
            err = -1;
            goto exit;
        }

        // Prepare the in6_ifreq struct and set the address to the interface
        if(inet_pton(AF_INET6, ipv6, &ifr6.addr) < 0) {
            LOGE("inet_pton() fail[%d].", errno);
            err = -1;
            goto exit;
        }
    } else {
        if(ifc_set_flags(sockfd, ifname, 0, IFF_UP) < 0) {
            LOGE("if down fail[%d].", errno);
            err = -1;
            goto exit;
        }

        // Copy the interface name to the ifreq struct
        strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
        // Get the ifrindex of the interface
        if(ioctl(sockfd, SIOGIFINDEX, &ifr) < 0)
        {
            LOGE("ioctl SIOGIFINDEX error.");
            err = -1;
            goto exit;
        }

        // Set IPv6 to 0.
        memset(&(ifr6.addr), 0, sizeof(struct in6_addr));
    }
    ifr6.ifindex = ifr.ifr_ifindex;
    ifr6.prefixlen = prefixLength;
    if(ioctl(sockfd, SIOCSIFADDR, &ifr6) < 0) {
        LOGE("ioctl SIOCSIFADDR error.");
        err = -1;
        goto exit;
    }

    LOGD("Set IPv6 : %s success.", ipv6);
exit:
    close(socket);
    return err;
}