Archipelago » qemu

/*

 * QEMU Guest Agent POSIX-specific command implementations

 *

 * Copyright IBM Corp. 2011

 *

 * Authors:

 *  Michael Roth      <mdroth@linux.vnet.ibm.com>

 *  Michal Privoznik  <mprivozn@redhat.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 */

#include <glib.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/wait.h>

#include "qga/guest-agent-core.h"

#include "qga-qmp-commands.h"

#include "qerror.h"

#include "qemu-queue.h"

#include "host-utils.h"

#ifndef CONFIG_HAS_ENVIRON

#ifdef __APPLE__

#include <crt_externs.h>

#define environ (*_NSGetEnviron())

#else

extern char **environ;

#endif

#endif

#if defined(__linux__)

#include <mntent.h>

#include <linux/fs.h>

#include <ifaddrs.h>

#include <arpa/inet.h>

#include <sys/socket.h>

#include <net/if.h>

#ifdef FIFREEZE

#define CONFIG_FSFREEZE

#endif

#ifdef FITRIM

#define CONFIG_FSTRIM

#endif

#endif

void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)

{

    const char *shutdown_flag;

    pid_t rpid, pid;

    int status;

    slog("guest-shutdown called, mode: %s", mode);

    if (!has_mode || strcmp(mode, "powerdown") == 0) {

        shutdown_flag = "-P";

    } else if (strcmp(mode, "halt") == 0) {

        shutdown_flag = "-H";

    } else if (strcmp(mode, "reboot") == 0) {

        shutdown_flag = "-r";

    } else {

        error_set(err, QERR_INVALID_PARAMETER_VALUE, "mode",

                  "halt|powerdown|reboot");

        return;

    }

    pid = fork();

    if (pid == 0) {

        /* child, start the shutdown */

        setsid();

        reopen_fd_to_null(0);

        reopen_fd_to_null(1);

        reopen_fd_to_null(2);

        execle("/sbin/shutdown", "shutdown", shutdown_flag, "+0",

               "hypervisor initiated shutdown", (char*)NULL, environ);

        _exit(EXIT_FAILURE);

    } else if (pid < 0) {

        goto exit_err;

    }

    do {

        rpid = waitpid(pid, &status, 0);

    } while (rpid == -1 && errno == EINTR);

    if (rpid == pid && WIFEXITED(status) && !WEXITSTATUS(status)) {

        return;

    }

exit_err:

    error_set(err, QERR_UNDEFINED_ERROR);

}

typedef struct GuestFileHandle {

    uint64_t id;

    FILE *fh;

    QTAILQ_ENTRY(GuestFileHandle) next;

} GuestFileHandle;

static struct {

    QTAILQ_HEAD(, GuestFileHandle) filehandles;

} guest_file_state;

static void guest_file_handle_add(FILE *fh)

{

    GuestFileHandle *gfh;

    gfh = g_malloc0(sizeof(GuestFileHandle));

    gfh->id = fileno(fh);

    gfh->fh = fh;

    QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);

}

static GuestFileHandle *guest_file_handle_find(int64_t id)

{

    GuestFileHandle *gfh;

    QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)

    {

        if (gfh->id == id) {

            return gfh;

        }

    }

    return NULL;

}

int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)

{

    FILE *fh;

    int fd;

    int64_t ret = -1;

    if (!has_mode) {

        mode = "r";

    }

    slog("guest-file-open called, filepath: %s, mode: %s", path, mode);

    fh = fopen(path, mode);

    if (!fh) {

        error_set(err, QERR_OPEN_FILE_FAILED, path);

        return -1;

    }

    /* set fd non-blocking to avoid common use cases (like reading from a

     * named pipe) from hanging the agent

     */

    fd = fileno(fh);

    ret = fcntl(fd, F_GETFL);

    ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);

    if (ret == -1) {

        error_set(err, QERR_QGA_COMMAND_FAILED, "fcntl() failed");

        fclose(fh);

        return -1;

    }

    guest_file_handle_add(fh);

    slog("guest-file-open, handle: %d", fd);

    return fd;

}

void qmp_guest_file_close(int64_t handle, Error **err)

{

    GuestFileHandle *gfh = guest_file_handle_find(handle);

    int ret;

    slog("guest-file-close called, handle: %ld", handle);

    if (!gfh) {

        error_set(err, QERR_FD_NOT_FOUND, "handle");

        return;

    }

    ret = fclose(gfh->fh);

    if (ret == -1) {

        error_set(err, QERR_QGA_COMMAND_FAILED, "fclose() failed");

        return;

    }

    QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);

    g_free(gfh);

}

struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,

                                          int64_t count, Error **err)

{

    GuestFileHandle *gfh = guest_file_handle_find(handle);

    GuestFileRead *read_data = NULL;

    guchar *buf;

    FILE *fh;

    size_t read_count;

    if (!gfh) {

        error_set(err, QERR_FD_NOT_FOUND, "handle");

        return NULL;

    }

    if (!has_count) {

        count = QGA_READ_COUNT_DEFAULT;

    } else if (count < 0) {

        error_set(err, QERR_INVALID_PARAMETER, "count");

        return NULL;

    }

    fh = gfh->fh;

    buf = g_malloc0(count+1);

    read_count = fread(buf, 1, count, fh);

    if (ferror(fh)) {

        slog("guest-file-read failed, handle: %ld", handle);

        error_set(err, QERR_QGA_COMMAND_FAILED, "fread() failed");

    } else {

        buf[read_count] = 0;

        read_data = g_malloc0(sizeof(GuestFileRead));

        read_data->count = read_count;

        read_data->eof = feof(fh);

        if (read_count) {

            read_data->buf_b64 = g_base64_encode(buf, read_count);

        }

    }

    g_free(buf);

    clearerr(fh);

    return read_data;

}

GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,

                                     bool has_count, int64_t count, Error **err)

{

    GuestFileWrite *write_data = NULL;

    guchar *buf;

    gsize buf_len;

    int write_count;

    GuestFileHandle *gfh = guest_file_handle_find(handle);

    FILE *fh;

    if (!gfh) {

        error_set(err, QERR_FD_NOT_FOUND, "handle");

        return NULL;

    }

    fh = gfh->fh;

    buf = g_base64_decode(buf_b64, &buf_len);

    if (!has_count) {

        count = buf_len;

    } else if (count < 0 || count > buf_len) {

        g_free(buf);

        error_set(err, QERR_INVALID_PARAMETER, "count");

        return NULL;

    }

    write_count = fwrite(buf, 1, count, fh);

    if (ferror(fh)) {

        slog("guest-file-write failed, handle: %ld", handle);

        error_set(err, QERR_QGA_COMMAND_FAILED, "fwrite() error");

    } else {

        write_data = g_malloc0(sizeof(GuestFileWrite));

        write_data->count = write_count;

        write_data->eof = feof(fh);

    }

    g_free(buf);

    clearerr(fh);

    return write_data;

}

struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,

                                          int64_t whence, Error **err)

{

    GuestFileHandle *gfh = guest_file_handle_find(handle);

    GuestFileSeek *seek_data = NULL;

    FILE *fh;

    int ret;

    if (!gfh) {

        error_set(err, QERR_FD_NOT_FOUND, "handle");

        return NULL;

    }

    fh = gfh->fh;

    ret = fseek(fh, offset, whence);

    if (ret == -1) {

        error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));

    } else {

        seek_data = g_malloc0(sizeof(GuestFileRead));

        seek_data->position = ftell(fh);

        seek_data->eof = feof(fh);

    }

    clearerr(fh);

    return seek_data;

}

void qmp_guest_file_flush(int64_t handle, Error **err)

{

    GuestFileHandle *gfh = guest_file_handle_find(handle);

    FILE *fh;

    int ret;

    if (!gfh) {

        error_set(err, QERR_FD_NOT_FOUND, "handle");

        return;

    }

    fh = gfh->fh;

    ret = fflush(fh);

    if (ret == EOF) {

        error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));

    }

}

static void guest_file_init(void)

{

    QTAILQ_INIT(&guest_file_state.filehandles);

}

/* linux-specific implementations. avoid this if at all possible. */

#if defined(__linux__)

#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)

typedef struct FsMount {

    char *dirname;

    char *devtype;

    QTAILQ_ENTRY(FsMount) next;

} FsMount;

typedef QTAILQ_HEAD(, FsMount) FsMountList;

static void free_fs_mount_list(FsMountList *mounts)

{

     FsMount *mount, *temp;

     if (!mounts) {

         return;

     }

     QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {

         QTAILQ_REMOVE(mounts, mount, next);

         g_free(mount->dirname);

         g_free(mount->devtype);

         g_free(mount);

     }

}

/*

 * Walk the mount table and build a list of local file systems

 */

static int build_fs_mount_list(FsMountList *mounts)

{

    struct mntent *ment;

    FsMount *mount;

    char const *mtab = "/proc/self/mounts";

    FILE *fp;

    fp = setmntent(mtab, "r");

    if (!fp) {

        g_warning("fsfreeze: unable to read mtab");

        return -1;

    }

    while ((ment = getmntent(fp))) {

        /*

         * An entry which device name doesn't start with a '/' is

         * either a dummy file system or a network file system.

         * Add special handling for smbfs and cifs as is done by

         * coreutils as well.

         */

        if ((ment->mnt_fsname[0] != '/') ||

            (strcmp(ment->mnt_type, "smbfs") == 0) ||

            (strcmp(ment->mnt_type, "cifs") == 0)) {

            continue;

        }

        mount = g_malloc0(sizeof(FsMount));

        mount->dirname = g_strdup(ment->mnt_dir);

        mount->devtype = g_strdup(ment->mnt_type);

        QTAILQ_INSERT_TAIL(mounts, mount, next);

    }

    endmntent(fp);

    return 0;

}

#endif

#if defined(CONFIG_FSFREEZE)

/*

 * Return status of freeze/thaw

 */

GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)

{

    if (ga_is_frozen(ga_state)) {

        return GUEST_FSFREEZE_STATUS_FROZEN;

    }

    return GUEST_FSFREEZE_STATUS_THAWED;

}

/*

 * Walk list of mounted file systems in the guest, and freeze the ones which

 * are real local file systems.

 */

int64_t qmp_guest_fsfreeze_freeze(Error **err)

{

    int ret = 0, i = 0;

    FsMountList mounts;

    struct FsMount *mount;

    int fd;

    char err_msg[512];

    slog("guest-fsfreeze called");

    QTAILQ_INIT(&mounts);

    ret = build_fs_mount_list(&mounts);

    if (ret < 0) {

        return ret;

    }

    /* cannot risk guest agent blocking itself on a write in this state */

    ga_set_frozen(ga_state);

    QTAILQ_FOREACH(mount, &mounts, next) {

        fd = qemu_open(mount->dirname, O_RDONLY);

        if (fd == -1) {

            sprintf(err_msg, "failed to open %s, %s", mount->dirname,

                    strerror(errno));

            error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);

            goto error;

        }

        /* we try to cull filesytems we know won't work in advance, but other

         * filesytems may not implement fsfreeze for less obvious reasons.

         * these will report EOPNOTSUPP. we simply ignore these when tallying

         * the number of frozen filesystems.

         *

         * any other error means a failure to freeze a filesystem we

         * expect to be freezable, so return an error in those cases

         * and return system to thawed state.

         */

        ret = ioctl(fd, FIFREEZE);

        if (ret == -1) {

            if (errno != EOPNOTSUPP) {

                sprintf(err_msg, "failed to freeze %s, %s",

                        mount->dirname, strerror(errno));

                error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);

                close(fd);

                goto error;

            }

        } else {

            i++;

        }

        close(fd);

    }

    free_fs_mount_list(&mounts);

    return i;

error:

    free_fs_mount_list(&mounts);

    qmp_guest_fsfreeze_thaw(NULL);

    return 0;

}

/*

 * Walk list of frozen file systems in the guest, and thaw them.

 */

int64_t qmp_guest_fsfreeze_thaw(Error **err)

{

    int ret;

    FsMountList mounts;

    FsMount *mount;

    int fd, i = 0, logged;

    QTAILQ_INIT(&mounts);

    ret = build_fs_mount_list(&mounts);

    if (ret) {

        error_set(err, QERR_QGA_COMMAND_FAILED,

                  "failed to enumerate filesystems");

        return 0;

    }

    QTAILQ_FOREACH(mount, &mounts, next) {

        logged = false;

        fd = qemu_open(mount->dirname, O_RDONLY);

        if (fd == -1) {

            continue;

        }

        /* we have no way of knowing whether a filesystem was actually unfrozen

         * as a result of a successful call to FITHAW, only that if an error

         * was returned the filesystem was *not* unfrozen by that particular

         * call.

         *

         * since multiple preceding FIFREEZEs require multiple calls to FITHAW

         * to unfreeze, continuing issuing FITHAW until an error is returned,

         * in which case either the filesystem is in an unfreezable state, or,

         * more likely, it was thawed previously (and remains so afterward).

         *

         * also, since the most recent successful call is the one that did

         * the actual unfreeze, we can use this to provide an accurate count

         * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which

         * may * be useful for determining whether a filesystem was unfrozen

         * during the freeze/thaw phase by a process other than qemu-ga.

         */

        do {

            ret = ioctl(fd, FITHAW);

            if (ret == 0 && !logged) {

                i++;

                logged = true;

            }

        } while (ret == 0);

        close(fd);

    }

    ga_unset_frozen(ga_state);

    free_fs_mount_list(&mounts);

    return i;

}

static void guest_fsfreeze_cleanup(void)

{

    int64_t ret;

    Error *err = NULL;

    if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {

        ret = qmp_guest_fsfreeze_thaw(&err);

        if (ret < 0 || err) {

            slog("failed to clean up frozen filesystems");

        }

    }

}

#endif /* CONFIG_FSFREEZE */

#if defined(CONFIG_FSTRIM)

/*

 * Walk list of mounted file systems in the guest, and trim them.

 */

void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)

{

    int ret = 0;

    FsMountList mounts;

    struct FsMount *mount;

    int fd;

    char err_msg[512];

    struct fstrim_range r = {

        .start = 0,

        .len = -1,

        .minlen = has_minimum ? minimum : 0,

    };

    slog("guest-fstrim called");

    QTAILQ_INIT(&mounts);

    ret = build_fs_mount_list(&mounts);

    if (ret < 0) {

        return;

    }

    QTAILQ_FOREACH(mount, &mounts, next) {

        fd = qemu_open(mount->dirname, O_RDONLY);

        if (fd == -1) {

            sprintf(err_msg, "failed to open %s, %s", mount->dirname,

                    strerror(errno));

            error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);

            goto error;

        }

        /* We try to cull filesytems we know won't work in advance, but other

         * filesytems may not implement fstrim for less obvious reasons.  These

         * will report EOPNOTSUPP; we simply ignore these errors.  Any other

         * error means an unexpected error, so return it in those cases.  In

         * some other cases ENOTTY will be reported (e.g. CD-ROMs).

         */

        ret = ioctl(fd, FITRIM, &r);

        if (ret == -1) {

            if (errno != ENOTTY && errno != EOPNOTSUPP) {

                sprintf(err_msg, "failed to trim %s, %s",

                        mount->dirname, strerror(errno));

                error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);

                close(fd);

                goto error;

            }

        }

        close(fd);

    }

error:

    free_fs_mount_list(&mounts);

}

#endif /* CONFIG_FSTRIM */

#define LINUX_SYS_STATE_FILE "/sys/power/state"

#define SUSPEND_SUPPORTED 0

#define SUSPEND_NOT_SUPPORTED 1

static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,

                               const char *sysfile_str, Error **err)

{

    char *pmutils_path;

    pid_t pid, rpid;

    int status;

    pmutils_path = g_find_program_in_path(pmutils_bin);

    pid = fork();

    if (!pid) {

        char buf[32]; /* hopefully big enough */

        ssize_t ret;

        int fd;

        setsid();

        reopen_fd_to_null(0);

        reopen_fd_to_null(1);

        reopen_fd_to_null(2);

        if (pmutils_path) {

            execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);

        }

        /*

         * If we get here either pm-utils is not installed or execle() has

         * failed. Let's try the manual method if the caller wants it.

         */

        if (!sysfile_str) {

            _exit(SUSPEND_NOT_SUPPORTED);

        }

        fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);

        if (fd < 0) {

            _exit(SUSPEND_NOT_SUPPORTED);

        }

        ret = read(fd, buf, sizeof(buf)-1);

        if (ret <= 0) {

            _exit(SUSPEND_NOT_SUPPORTED);

        }

        buf[ret] = '\0';

        if (strstr(buf, sysfile_str)) {

            _exit(SUSPEND_SUPPORTED);

        }

        _exit(SUSPEND_NOT_SUPPORTED);

    }

    g_free(pmutils_path);

    if (pid < 0) {

        goto undef_err;

    }

    do {

        rpid = waitpid(pid, &status, 0);

    } while (rpid == -1 && errno == EINTR);

    if (rpid == pid && WIFEXITED(status)) {

        switch (WEXITSTATUS(status)) {

        case SUSPEND_SUPPORTED:

            return;

        case SUSPEND_NOT_SUPPORTED:

            error_set(err, QERR_UNSUPPORTED);

            return;

        default:

            goto undef_err;

        }

    }

undef_err:

    error_set(err, QERR_UNDEFINED_ERROR);

}

static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,

                          Error **err)

{

    char *pmutils_path;

    pid_t rpid, pid;

    int status;

    pmutils_path = g_find_program_in_path(pmutils_bin);

    pid = fork();

    if (pid == 0) {

        /* child */

        int fd;

        setsid();

        reopen_fd_to_null(0);

        reopen_fd_to_null(1);

        reopen_fd_to_null(2);

        if (pmutils_path) {

            execle(pmutils_path, pmutils_bin, NULL, environ);

        }

        /*

         * If we get here either pm-utils is not installed or execle() has

         * failed. Let's try the manual method if the caller wants it.

         */

        if (!sysfile_str) {

            _exit(EXIT_FAILURE);

        }

        fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);

        if (fd < 0) {

            _exit(EXIT_FAILURE);

        }

        if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {

            _exit(EXIT_FAILURE);

        }

        _exit(EXIT_SUCCESS);

    }

    g_free(pmutils_path);

    if (pid < 0) {

        goto exit_err;

    }

    do {

        rpid = waitpid(pid, &status, 0);

    } while (rpid == -1 && errno == EINTR);

    if (rpid == pid && WIFEXITED(status) && !WEXITSTATUS(status)) {

        return;

    }

exit_err:

    error_set(err, QERR_UNDEFINED_ERROR);

}

void qmp_guest_suspend_disk(Error **err)

{

    bios_supports_mode("pm-is-supported", "--hibernate", "disk", err);

    if (error_is_set(err)) {

        return;

    }

    guest_suspend("pm-hibernate", "disk", err);

}

void qmp_guest_suspend_ram(Error **err)

{

    bios_supports_mode("pm-is-supported", "--suspend", "mem", err);

    if (error_is_set(err)) {

        return;

    }

    guest_suspend("pm-suspend", "mem", err);

}

void qmp_guest_suspend_hybrid(Error **err)

{

    bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, err);

    if (error_is_set(err)) {

        return;

    }

    guest_suspend("pm-suspend-hybrid", NULL, err);

}

static GuestNetworkInterfaceList *

guest_find_interface(GuestNetworkInterfaceList *head,

                     const char *name)

{

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

        if (strcmp(head->value->name, name) == 0) {

            break;

        }

    }

    return head;

}

/*

 * Build information about guest interfaces

 */

GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)

{

    GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;

    struct ifaddrs *ifap, *ifa;

    char err_msg[512];

    if (getifaddrs(&ifap) < 0) {

        snprintf(err_msg, sizeof(err_msg),

                 "getifaddrs failed: %s", strerror(errno));

        error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

        goto error;

    }

    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {

        GuestNetworkInterfaceList *info;

        GuestIpAddressList **address_list = NULL, *address_item = NULL;

        char addr4[INET_ADDRSTRLEN];

        char addr6[INET6_ADDRSTRLEN];

        int sock;

        struct ifreq ifr;

        unsigned char *mac_addr;

        void *p;

        g_debug("Processing %s interface", ifa->ifa_name);

        info = guest_find_interface(head, ifa->ifa_name);

        if (!info) {

            info = g_malloc0(sizeof(*info));

            info->value = g_malloc0(sizeof(*info->value));

            info->value->name = g_strdup(ifa->ifa_name);

            if (!cur_item) {

                head = cur_item = info;

            } else {

                cur_item->next = info;

                cur_item = info;

            }

        }

        if (!info->value->has_hardware_address &&

            ifa->ifa_flags & SIOCGIFHWADDR) {

            /* we haven't obtained HW address yet */

            sock = socket(PF_INET, SOCK_STREAM, 0);

            if (sock == -1) {

                snprintf(err_msg, sizeof(err_msg),

                         "failed to create socket: %s", strerror(errno));

                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

                goto error;

            }

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

            strncpy(ifr.ifr_name,  info->value->name, IF_NAMESIZE);

            if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {

                snprintf(err_msg, sizeof(err_msg),

                         "failed to get MAC address of %s: %s",

                         ifa->ifa_name,

                         strerror(errno));

                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

                goto error;

            }

            mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;

            if (asprintf(&info->value->hardware_address,

                         "%02x:%02x:%02x:%02x:%02x:%02x",

                         (int) mac_addr[0], (int) mac_addr[1],

                         (int) mac_addr[2], (int) mac_addr[3],

                         (int) mac_addr[4], (int) mac_addr[5]) == -1) {

                snprintf(err_msg, sizeof(err_msg),

                         "failed to format MAC: %s", strerror(errno));

                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

                goto error;

            }

            info->value->has_hardware_address = true;

            close(sock);

        }

        if (ifa->ifa_addr &&

            ifa->ifa_addr->sa_family == AF_INET) {

            /* interface with IPv4 address */

            address_item = g_malloc0(sizeof(*address_item));

            address_item->value = g_malloc0(sizeof(*address_item->value));

            p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;

            if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {

                snprintf(err_msg, sizeof(err_msg),

                         "inet_ntop failed : %s", strerror(errno));

                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

                goto error;

            }

            address_item->value->ip_address = g_strdup(addr4);

            address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;

            if (ifa->ifa_netmask) {

                /* Count the number of set bits in netmask.

                 * This is safe as '1' and '0' cannot be shuffled in netmask. */

                p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;

                address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);

            }

        } else if (ifa->ifa_addr &&

                   ifa->ifa_addr->sa_family == AF_INET6) {

            /* interface with IPv6 address */

            address_item = g_malloc0(sizeof(*address_item));

            address_item->value = g_malloc0(sizeof(*address_item->value));

            p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;

            if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {

                snprintf(err_msg, sizeof(err_msg),

                         "inet_ntop failed : %s", strerror(errno));

                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);

                goto error;