/libfido2/src/netlink.c

Source
/*
 * Copyright (c) 2020 Yubico AB. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <sys/socket.h>

#include <linux/genetlink.h>
#include <linux/netlink.h>
#include <linux/nfc.h>

#include <errno.h>
#include <limits.h>

#include "fido.h"
#include "netlink.h"

#ifdef FIDO_FUZZ
static ssize_t (*fuzz_read)(int, void *, size_t);
static ssize_t (*fuzz_write)(int, const void *, size_t);
# define READ   fuzz_read
# define WRITE  fuzz_write
#else
# define READ   read
# define WRITE  write
#endif

#ifndef SOL_NETLINK
#define SOL_NETLINK     270
#endif

#define NETLINK_POLL_MS 100

/* XXX avoid signed NLA_ALIGNTO */
#undef NLA_HDRLEN
#define NLA_HDRLEN      NLMSG_ALIGN(sizeof(struct nlattr))

typedef struct nlmsgbuf {
        size_t         siz; /* alloc size */
        size_t         len; /* of payload */
        unsigned char *ptr; /* in payload */
        union {
                struct nlmsghdr   nlmsg;
                char              buf[NLMSG_HDRLEN]; /* align */
        }              u;
        unsigned char  payload[];
} nlmsgbuf_t;

typedef struct genlmsgbuf {
        union {
                struct genlmsghdr genl;
                char              buf[GENL_HDRLEN];  /* align */
        }              u;
} genlmsgbuf_t;

typedef struct nlamsgbuf {
        size_t         siz; /* alloc size */
        size_t         len; /* of payload */
        unsigned char *ptr; /* in payload */
        union {
                struct nlattr     nla;
                char              buf[NLA_HDRLEN];   /* align */
        }              u;
        unsigned char  payload[];
} nlamsgbuf_t;

typedef struct nl_family {
        uint16_t id;
        uint32_t mcastgrp;
} nl_family_t;

typedef struct nl_poll {
        uint32_t     dev;
        unsigned int eventcnt;
} nl_poll_t;

typedef struct nl_target {
        int       found;
        uint32_t *value;
} nl_target_t;

static const void *
nlmsg_ptr(const nlmsgbuf_t *m)
{
        return (&m->u.nlmsg);
}

static size_t
nlmsg_len(const nlmsgbuf_t *m)
{
        return (m->u.nlmsg.nlmsg_len);
}

static uint16_t
nlmsg_type(const nlmsgbuf_t *m)
{
        return (m->u.nlmsg.nlmsg_type);
}

static nlmsgbuf_t *
nlmsg_new(uint16_t type, uint16_t flags, size_t len)
{
        nlmsgbuf_t *m;
        size_t siz;

        if (len > SIZE_MAX - sizeof(*m) ||
            (siz = sizeof(*m) + len) > UINT16_MAX ||
            (m = calloc(1, siz)) == NULL)
                return (NULL);

        m->siz = siz;
        m->len = len;
        m->ptr = m->payload;
        m->u.nlmsg.nlmsg_type = type;
        m->u.nlmsg.nlmsg_flags = NLM_F_REQUEST | flags;
        m->u.nlmsg.nlmsg_len = NLMSG_HDRLEN;

        return (m);
}

static nlamsgbuf_t *
nla_from_buf(const unsigned char **ptr, size_t *len)
{
        nlamsgbuf_t h, *a;
        size_t nlalen, skip;

        if (*len < sizeof(h.u))
                return (NULL);

        memset(&h, 0, sizeof(h));
        memcpy(&h.u, *ptr, sizeof(h.u));

        if ((nlalen = h.u.nla.nla_len) < sizeof(h.u) || nlalen > *len ||
            nlalen - sizeof(h.u) > UINT16_MAX ||
            nlalen > SIZE_MAX - sizeof(*a) ||
            (skip = NLMSG_ALIGN(nlalen)) > *len ||
            (a = calloc(1, sizeof(*a) + nlalen - sizeof(h.u))) == NULL)
                return (NULL);

        memcpy(&a->u, *ptr, nlalen);
        a->siz = sizeof(*a) + nlalen - sizeof(h.u);
        a->ptr = a->payload;
        a->len = nlalen - sizeof(h.u);
        *ptr += skip;
        *len -= skip;

        return (a);
}

static nlamsgbuf_t *
nla_getattr(nlamsgbuf_t *a)
{
        return (nla_from_buf((void *)&a->ptr, &a->len));
}

static uint16_t
nla_type(const nlamsgbuf_t *a)
{
        return (a->u.nla.nla_type);
}

static nlamsgbuf_t *
nlmsg_getattr(nlmsgbuf_t *m)
{
        return (nla_from_buf((void *)&m->ptr, &m->len));
}

static int
nla_read(nlamsgbuf_t *a, void *buf, size_t cnt)
{
        if (cnt > a->u.nla.nla_len ||
            fido_buf_read((void *)&a->ptr, &a->len, buf, cnt) < 0)
                return (-1);

        a->u.nla.nla_len = (uint16_t)(a->u.nla.nla_len - cnt);

        return (0);
}

static nlmsgbuf_t *
nlmsg_from_buf(const unsigned char **ptr, size_t *len)
{
        nlmsgbuf_t h, *m;
        size_t msglen, skip;

        if (*len < sizeof(h.u))
                return (NULL);

        memset(&h, 0, sizeof(h));
        memcpy(&h.u, *ptr, sizeof(h.u));

        if ((msglen = h.u.nlmsg.nlmsg_len) < sizeof(h.u) || msglen > *len ||
            msglen - sizeof(h.u) > UINT16_MAX ||
            (skip = NLMSG_ALIGN(msglen)) > *len ||
            (m = nlmsg_new(0, 0, msglen - sizeof(h.u))) == NULL)
                return (NULL);

        memcpy(&m->u, *ptr, msglen);
        *ptr += skip;
        *len -= skip;

        return (m);
}

static int
nlmsg_read(nlmsgbuf_t *m, void *buf, size_t cnt)
{
        if (cnt > m->u.nlmsg.nlmsg_len ||
            fido_buf_read((void *)&m->ptr, &m->len, buf, cnt) < 0)
                return (-1);

        m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len - cnt);

        return (0);
}

static int
nlmsg_write(nlmsgbuf_t *m, const void *buf, size_t cnt)
{
        if (cnt > UINT32_MAX - m->u.nlmsg.nlmsg_len ||
            fido_buf_write(&m->ptr, &m->len, buf, cnt) < 0)
                return (-1);

        m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len + cnt);

        return (0);
}

static int
nlmsg_set_genl(nlmsgbuf_t *m, uint8_t cmd)
{
        genlmsgbuf_t g;

        memset(&g, 0, sizeof(g));
        g.u.genl.cmd = cmd;
        g.u.genl.version = NFC_GENL_VERSION;

        return (nlmsg_write(m, &g, sizeof(g)));
}

static int
nlmsg_get_genl(nlmsgbuf_t *m, uint8_t cmd)
{
        genlmsgbuf_t g;

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

        if (nlmsg_read(m, &g, sizeof(g)) < 0 || g.u.genl.cmd != cmd)
                return (-1);

        return (0);
}

static int
nlmsg_get_status(nlmsgbuf_t *m)
{
        int status;

        if (nlmsg_read(m, &status, sizeof(status)) < 0 || status == INT_MIN)
                return (-1);
        if (status < 0)
                status = -status;

        return (status);
}

static int
nlmsg_setattr(nlmsgbuf_t *m, uint16_t type, const void *ptr, size_t len)
{
        int r;
        char *padding;
        size_t skip;
        nlamsgbuf_t a;

        if ((skip = NLMSG_ALIGN(len)) > UINT16_MAX - sizeof(a.u) ||
            skip < len || (padding = calloc(1, skip - len)) == NULL)
                return (-1);

        memset(&a, 0, sizeof(a));
        a.u.nla.nla_type = type;
        a.u.nla.nla_len = (uint16_t)(len + sizeof(a.u));
        r = nlmsg_write(m, &a.u, sizeof(a.u)) < 0 ||
            nlmsg_write(m, ptr, len) < 0 ||
            nlmsg_write(m, padding, skip - len) < 0 ? -1 : 0;

        free(padding);

        return (r);
}

static int
nlmsg_set_u16(nlmsgbuf_t *m, uint16_t type, uint16_t val)
{
        return (nlmsg_setattr(m, type, &val, sizeof(val)));
}

static int
nlmsg_set_u32(nlmsgbuf_t *m, uint16_t type, uint32_t val)
{
        return (nlmsg_setattr(m, type, &val, sizeof(val)));
}

static int
nlmsg_set_str(nlmsgbuf_t *m, uint16_t type, const char *val)
{
        return (nlmsg_setattr(m, type, val, strlen(val) + 1));
}

static int
nla_get_u16(nlamsgbuf_t *a, uint16_t *v)
{
        return (nla_read(a, v, sizeof(*v)));
}

static int
nla_get_u32(nlamsgbuf_t *a, uint32_t *v)
{
        return (nla_read(a, v, sizeof(*v)));
}

static char *
nla_get_str(nlamsgbuf_t *a)
{
        size_t n;
        char *s = NULL;

        if ((n = a->len) < 1 || a->ptr[n - 1] != '\0' ||
            (s = calloc(1, n)) == NULL || nla_read(a, s, n) < 0) {
                free(s);
                return (NULL);
        }
        s[n - 1] = '\0';

        return (s);
}

static int
nlmsg_tx(int fd, const nlmsgbuf_t *m)
{
        ssize_t r;

        if ((r = WRITE(fd, nlmsg_ptr(m), nlmsg_len(m))) == -1) {
                fido_log_error(errno, "%s: write", __func__);
                return (-1);
        }
        if (r < 0 || (size_t)r != nlmsg_len(m)) {
                fido_log_debug("%s: %zd != %zu", __func__, r, nlmsg_len(m));
                return (-1);
        }
        fido_log_xxd(nlmsg_ptr(m), nlmsg_len(m), "%s", __func__);

        return (0);
}

static ssize_t
nlmsg_rx(int fd, unsigned char *ptr, size_t len, int ms)
{
        ssize_t r;

        if (len > SSIZE_MAX) {
                fido_log_debug("%s: len", __func__);
                return (-1);
        }
        if (fido_hid_unix_wait(fd, ms, NULL) < 0) {
                fido_log_debug("%s: fido_hid_unix_wait", __func__);
                return (-1);
        }
        if ((r = READ(fd, ptr, len)) == -1) {
                fido_log_error(errno, "%s: read %zd", __func__, r);
                return (-1);
        }
        fido_log_xxd(ptr, (size_t)r, "%s", __func__);

        return (r);
}

static int
nlmsg_iter(nlmsgbuf_t *m, void *arg, int (*parser)(nlamsgbuf_t *, void *))
{
        nlamsgbuf_t *a;
        int r;

        while ((a = nlmsg_getattr(m)) != NULL) {
                r = parser(a, arg);
                free(a);
                if (r < 0) {
                        fido_log_debug("%s: parser", __func__);
                        return (-1);
                }
        }

        return (0);
}

static int
nla_iter(nlamsgbuf_t *g, void *arg, int (*parser)(nlamsgbuf_t *, void *))
{
        nlamsgbuf_t *a;
        int r;

        while ((a = nla_getattr(g)) != NULL) {
                r = parser(a, arg);
                free(a);
                if (r < 0) {
                        fido_log_debug("%s: parser", __func__);
                        return (-1);
                }
        }

        return (0);
}

static int
nl_parse_reply(const uint8_t *blob, size_t blob_len, uint16_t msg_type,
    uint8_t genl_cmd, void *arg, int (*parser)(nlamsgbuf_t *, void *))
{
        nlmsgbuf_t *m;
        int r;

        while (blob_len) {
                if ((m = nlmsg_from_buf(&blob, &blob_len)) == NULL) {
                        fido_log_debug("%s: nlmsg", __func__);
                        return (-1);
                }
                if (nlmsg_type(m) == NLMSG_ERROR) {
                        r = nlmsg_get_status(m);
                        free(m);
                        return (r);
                }
                if (nlmsg_type(m) != msg_type ||
                    nlmsg_get_genl(m, genl_cmd) < 0) {
                        fido_log_debug("%s: skipping", __func__);
                        free(m);
                        continue;
                }
                if (parser != NULL && nlmsg_iter(m, arg, parser) < 0) {
                        fido_log_debug("%s: nlmsg_iter", __func__);
                        free(m);
                        return (-1);
                }
                free(m);
        }

        return (0);
}

static int
parse_mcastgrp(nlamsgbuf_t *a, void *arg)
{
        nl_family_t *family = arg;
        char *name;

        switch (nla_type(a)) {
        case CTRL_ATTR_MCAST_GRP_NAME:
                if ((name = nla_get_str(a)) == NULL ||
                    strcmp(name, NFC_GENL_MCAST_EVENT_NAME) != 0) {
                        free(name);
                        return (-1); /* XXX skip? */
                }
                free(name);
                return (0);
        case CTRL_ATTR_MCAST_GRP_ID:
                if (family->mcastgrp)
                        break;
                if (nla_get_u32(a, &family->mcastgrp) < 0) {
                        fido_log_debug("%s: group", __func__);
                        return (-1);
                }
                return (0);
        }

        fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));

        return (0);
}

static int
parse_mcastgrps(nlamsgbuf_t *a, void *arg)
{
        return (nla_iter(a, arg, parse_mcastgrp));
}

static int
parse_family(nlamsgbuf_t *a, void *arg)
{
        nl_family_t *family = arg;

        switch (nla_type(a)) {
        case CTRL_ATTR_FAMILY_ID:
                if (family->id)
                        break;
                if (nla_get_u16(a, &family->id) < 0) {
                        fido_log_debug("%s: id", __func__);
                        return (-1);
                }
                return (0);
        case CTRL_ATTR_MCAST_GROUPS:
                return (nla_iter(a, family, parse_mcastgrps));
        }

        fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));

        return (0);
}

static int
nl_get_nfc_family(int fd, uint16_t *type, uint32_t *mcastgrp)
{
        nlmsgbuf_t *m;
        uint8_t reply[512];
        nl_family_t family;
        ssize_t r;
        int ok;

        if ((m = nlmsg_new(GENL_ID_CTRL, 0, 64)) == NULL ||
            nlmsg_set_genl(m, CTRL_CMD_GETFAMILY) < 0 ||
            nlmsg_set_u16(m, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL) < 0 ||
            nlmsg_set_str(m, CTRL_ATTR_FAMILY_NAME, NFC_GENL_NAME) < 0 ||
            nlmsg_tx(fd, m) < 0) {
                free(m);
                return (-1);
        }
        free(m);
        memset(&family, 0, sizeof(family));
        if ((r = nlmsg_rx(fd, reply, sizeof(reply), -1)) < 0) {
                fido_log_debug("%s: nlmsg_rx", __func__);
                return (-1);
        }
        if ((ok = nl_parse_reply(reply, (size_t)r, GENL_ID_CTRL,
            CTRL_CMD_NEWFAMILY, &family, parse_family)) != 0) {
                fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
                return (-1);
        }
        if (family.id == 0 || family.mcastgrp == 0) {
                fido_log_debug("%s: missing attr", __func__);
                return (-1);
        }
        *type = family.id;
        *mcastgrp = family.mcastgrp;

        return (0);
}

static int
parse_target(nlamsgbuf_t *a, void *arg)
{
        nl_target_t *t = arg;

        if (t->found || nla_type(a) != NFC_ATTR_TARGET_INDEX) {
                fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
                return (0);
        }
        if (nla_get_u32(a, t->value) < 0) {
                fido_log_debug("%s: target", __func__);
                return (-1);
        }
        t->found = 1;

        return (0);
}

int
fido_nl_power_nfc(fido_nl_t *nl, uint32_t dev)
{
        nlmsgbuf_t *m;
        uint8_t reply[512];
        ssize_t r;
        int ok;

        if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL ||
            nlmsg_set_genl(m, NFC_CMD_DEV_UP) < 0 ||
            nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 ||
            nlmsg_tx(nl->fd, m) < 0) {
                free(m);
                return (-1);
        }
        free(m);
        if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) {
                fido_log_debug("%s: nlmsg_rx", __func__);
                return (-1);
        }
        if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
            NFC_CMD_DEV_UP, NULL, NULL)) != 0 && ok != EALREADY) {
                fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
                return (-1);
        }

        return (0);
}

static int
nl_nfc_poll(fido_nl_t *nl, uint32_t dev)
{
        nlmsgbuf_t *m;
        uint8_t reply[512];
        ssize_t r;
        int ok;

        if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL ||
            nlmsg_set_genl(m, NFC_CMD_START_POLL) < 0 ||
            nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 ||
            nlmsg_set_u32(m, NFC_ATTR_PROTOCOLS, NFC_PROTO_ISO14443_MASK) < 0 ||
            nlmsg_tx(nl->fd, m) < 0) {
                free(m);
                return (-1);
        }
        free(m);
        if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) {
                fido_log_debug("%s: nlmsg_rx", __func__);
                return (-1);
        }
        if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
            NFC_CMD_START_POLL, NULL, NULL)) != 0) {
                fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
                return (-1);
        }

        return (0);
}

static int
nl_dump_nfc_target(fido_nl_t *nl, uint32_t dev, uint32_t *target, int ms)
{
        nlmsgbuf_t *m;
        nl_target_t t;
        uint8_t reply[512];
        ssize_t r;
        int ok;

        if ((m = nlmsg_new(nl->nfc_type, NLM_F_DUMP, 64)) == NULL ||
            nlmsg_set_genl(m, NFC_CMD_GET_TARGET) < 0 ||
            nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 ||
            nlmsg_tx(nl->fd, m) < 0) {
                free(m);
                return (-1);
        }
        free(m);
        if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), ms)) < 0) {
                fido_log_debug("%s: nlmsg_rx", __func__);
                return (-1);
        }
        memset(&t, 0, sizeof(t));
        t.value = target;
        if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
            NFC_CMD_GET_TARGET, &t, parse_target)) != 0) {
                fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
                return (-1);
        }
        if (!t.found) {
                fido_log_debug("%s: target not found", __func__);
                return (-1);
        }

        return (0);
}

static int
parse_nfc_event(nlamsgbuf_t *a, void *arg)
{
        nl_poll_t *ctx = arg;
        uint32_t dev;

        if (nla_type(a) != NFC_ATTR_DEVICE_INDEX) {
                fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
                return (0);
        }
        if (nla_get_u32(a, &dev) < 0) {
                fido_log_debug("%s: dev", __func__);
                return (-1);
        }
        if (dev == ctx->dev)
                ctx->eventcnt++;
        else
                fido_log_debug("%s: ignoring dev 0x%x", __func__, dev);

        return (0);
}

int
fido_nl_get_nfc_target(fido_nl_t *nl, uint32_t dev, uint32_t *target)
{
        uint8_t reply[512];
        nl_poll_t ctx;
        ssize_t r;
        int ok;

        if (nl_nfc_poll(nl, dev) < 0) {
                fido_log_debug("%s: nl_nfc_poll", __func__);
                return (-1);
        }
#ifndef FIDO_FUZZ
        if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
            &nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) {
                fido_log_error(errno, "%s: setsockopt add", __func__);
                return (-1);
        }
#endif
        r = nlmsg_rx(nl->fd, reply, sizeof(reply), NETLINK_POLL_MS);
#ifndef FIDO_FUZZ
        if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP,
            &nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) {
                fido_log_error(errno, "%s: setsockopt drop", __func__);
                return (-1);
        }
#endif
        if (r < 0) {
                fido_log_debug("%s: nlmsg_rx", __func__);
                return (-1);
        }
        memset(&ctx, 0, sizeof(ctx));
        ctx.dev = dev;
        if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
            NFC_EVENT_TARGETS_FOUND, &ctx, parse_nfc_event)) != 0) {
                fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
                return (-1);
        }
        if (ctx.eventcnt == 0) {
                fido_log_debug("%s: dev 0x%x not observed", __func__, dev);
                return (-1);
        }
        if (nl_dump_nfc_target(nl, dev, target, -1) < 0) {
                fido_log_debug("%s: nl_dump_nfc_target", __func__);
                return (-1);
        }

        return (0);
}

void
fido_nl_free(fido_nl_t **nlp)
{
        fido_nl_t *nl;

        if (nlp == NULL || (nl = *nlp) == NULL)
                return;
        if (nl->fd != -1 && close(nl->fd) == -1)
                fido_log_error(errno, "%s: close", __func__);

        free(nl);
        *nlp = NULL;
}

fido_nl_t *
fido_nl_new(void)
{
        fido_nl_t *nl;
        int ok = -1;

        if ((nl = calloc(1, sizeof(*nl))) == NULL)
                return (NULL);
        if ((nl->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC,
            NETLINK_GENERIC)) == -1) {
                fido_log_error(errno, "%s: socket", __func__);
                goto fail;
        }
        nl->saddr.nl_family = AF_NETLINK;
        if (bind(nl->fd, (struct sockaddr *)&nl->saddr,
            sizeof(nl->saddr)) == -1) {
                fido_log_error(errno, "%s: bind", __func__);
                goto fail;
        }
        if (nl_get_nfc_family(nl->fd, &nl->nfc_type, &nl->nfc_mcastgrp) < 0) {
                fido_log_debug("%s: nl_get_nfc_family", __func__);
                goto fail;
        }

        ok = 0;
fail:
        if (ok < 0)
                fido_nl_free(&nl);

        return (nl);
}

#ifdef FIDO_FUZZ
void
set_netlink_io_functions(ssize_t (*read_f)(int, void *, size_t),
    ssize_t (*write_f)(int, const void *, size_t))
{
        fuzz_read = read_f;
        fuzz_write = write_f;
}
#endif

Coverage Report

Created: 2025-10-04 18:33

Line	Count	Source
1		/*
2		* Copyright (c) 2020 Yubico AB. All rights reserved.
3		* Use of this source code is governed by a BSD-style
4		* license that can be found in the LICENSE file.
5		* SPDX-License-Identifier: BSD-2-Clause
6		*/
7
8		#include <sys/socket.h>
9
10		#include <linux/genetlink.h>
11		#include <linux/netlink.h>
12		#include <linux/nfc.h>
13
14		#include <errno.h>
15		#include <limits.h>
16
17		#include "fido.h"
18		#include "netlink.h"
19
20		#ifdef FIDO_FUZZ
21		static ssize_t (fuzz_read)(int, void , size_t);
22		static ssize_t (fuzz_write)(int, const void , size_t);
23	2.72M	# define READ fuzz_read
24	2.72M	# define WRITE fuzz_write
25		#else
26		# define READ read
27		# define WRITE write
28		#endif
29
30		#ifndef SOL_NETLINK
31		#define SOL_NETLINK 270
32		#endif
33
34	1.94k	#define NETLINK_POLL_MS 100
35
36		/* XXX avoid signed NLA_ALIGNTO */
37		#undef NLA_HDRLEN
38		#define NLA_HDRLEN NLMSG_ALIGN(sizeof(struct nlattr))
39
40		typedef struct nlmsgbuf {
41		size_t siz; /* alloc size */
42		size_t len; /* of payload */
43		unsigned char ptr; / in payload */
44		union {
45		struct nlmsghdr nlmsg;
46		char buf[NLMSG_HDRLEN]; /* align */
47		} u;
48		unsigned char payload[];
49		} nlmsgbuf_t;
50
51		typedef struct genlmsgbuf {
52		union {
53		struct genlmsghdr genl;
54		char buf[GENL_HDRLEN]; /* align */
55		} u;
56		} genlmsgbuf_t;
57
58		typedef struct nlamsgbuf {
59		size_t siz; /* alloc size */
60		size_t len; /* of payload */
61		unsigned char ptr; / in payload */
62		union {
63		struct nlattr nla;
64		char buf[NLA_HDRLEN]; /* align */
65		} u;
66		unsigned char payload[];
67		} nlamsgbuf_t;
68
69		typedef struct nl_family {
70		uint16_t id;
71		uint32_t mcastgrp;
72		} nl_family_t;
73
74		typedef struct nl_poll {
75		uint32_t dev;
76		unsigned int eventcnt;
77		} nl_poll_t;
78
79		typedef struct nl_target {
80		int found;
81		uint32_t *value;
82		} nl_target_t;
83
84		static const void *
85		nlmsg_ptr(const nlmsgbuf_t *m)
86	5.44M	{
87	5.44M	return (&m->u.nlmsg);
88	5.44M	}
89
90		static size_t
91		nlmsg_len(const nlmsgbuf_t *m)
92	8.16M	{
93	8.16M	return (m->u.nlmsg.nlmsg_len);
94	8.16M	}
95
96		static uint16_t
97		nlmsg_type(const nlmsgbuf_t *m)
98	37.1k	{
99	37.1k	return (m->u.nlmsg.nlmsg_type);
100	37.1k	}
101
102		static nlmsgbuf_t *
103		nlmsg_new(uint16_t type, uint16_t flags, size_t len)
104	2.77M	{
105	2.77M	nlmsgbuf_t *m;
106	2.77M	size_t siz;
107
108	2.77M	if (len > SIZE_MAX - sizeof(*m) \|\|
109	2.77M	(siz = sizeof(*m) + len) > UINT16_MAX \|\|
110	2.77M	(m = calloc(1, siz)) == NULL)
111	8.14k	return (NULL);
112
113	2.76M	m->siz = siz;
114	2.76M	m->len = len;
115	2.76M	m->ptr = m->payload;
116	2.76M	m->u.nlmsg.nlmsg_type = type;
117	2.76M	m->u.nlmsg.nlmsg_flags = NLM_F_REQUEST \| flags;
118	2.76M	m->u.nlmsg.nlmsg_len = NLMSG_HDRLEN;
119
120	2.76M	return (m);
121	2.77M	}
122
123		static nlamsgbuf_t *
124		nla_from_buf(const unsigned char *ptr, size_t len)
125	84.6k	{
126	84.6k	nlamsgbuf_t h, *a;
127	84.6k	size_t nlalen, skip;
128
129	84.6k	if (*len < sizeof(h.u))
130	12.4k	return (NULL);
131
132	72.1k	memset(&h, 0, sizeof(h));
133	72.1k	memcpy(&h.u, *ptr, sizeof(h.u));
134
135	72.1k	if ((nlalen = h.u.nla.nla_len) < sizeof(h.u) \|\| nlalen > *len \|\|
136	72.1k	nlalen - sizeof(h.u) > UINT16_MAX \|\|
137	72.1k	nlalen > SIZE_MAX - sizeof(*a) \|\|
138	72.1k	(skip = NLMSG_ALIGN(nlalen)) > *len \|\|
139	72.1k	(a = calloc(1, sizeof(*a) + nlalen - sizeof(h.u))) == NULL)
140	10.9k	return (NULL);
141
142	61.1k	memcpy(&a->u, *ptr, nlalen);
143	61.1k	a->siz = sizeof(*a) + nlalen - sizeof(h.u);
144	61.1k	a->ptr = a->payload;
145	61.1k	a->len = nlalen - sizeof(h.u);
146	61.1k	*ptr += skip;
147	61.1k	*len -= skip;
148
149	61.1k	return (a);
150	72.1k	}
151
152		static nlamsgbuf_t *
153		nla_getattr(nlamsgbuf_t *a)
154	34.5k	{
155	34.5k	return (nla_from_buf((void *)&a->ptr, &a->len));
156	34.5k	}
157
158		static uint16_t
159		nla_type(const nlamsgbuf_t *a)
160	82.8k	{
161	82.8k	return (a->u.nla.nla_type);
162	82.8k	}
163
164		static nlamsgbuf_t *
165		nlmsg_getattr(nlmsgbuf_t *m)
166	50.0k	{
167	50.0k	return (nla_from_buf((void *)&m->ptr, &m->len));
168	50.0k	}
169
170		static int
171		nla_read(nlamsgbuf_t a, void buf, size_t cnt)
172	11.7k	{
173	11.7k	if (cnt > a->u.nla.nla_len \|\|
174	11.7k	fido_buf_read((void *)&a->ptr, &a->len, buf, cnt) < 0)
175	132	return (-1);
176
177	11.5k	a->u.nla.nla_len = (uint16_t)(a->u.nla.nla_len - cnt);
178
179	11.5k	return (0);
180	11.7k	}
181
182		static nlmsgbuf_t *
183		nlmsg_from_buf(const unsigned char *ptr, size_t len)
184	25.9k	{
185	25.9k	nlmsgbuf_t h, *m;
186	25.9k	size_t msglen, skip;
187
188	25.9k	if (*len < sizeof(h.u))
189	3.22k	return (NULL);
190
191	22.7k	memset(&h, 0, sizeof(h));
192	22.7k	memcpy(&h.u, *ptr, sizeof(h.u));
193
194	22.7k	if ((msglen = h.u.nlmsg.nlmsg_len) < sizeof(h.u) \|\| msglen > *len \|\|
195	22.7k	msglen - sizeof(h.u) > UINT16_MAX \|\|
196	22.7k	(skip = NLMSG_ALIGN(msglen)) > *len \|\|
197	22.7k	(m = nlmsg_new(0, 0, msglen - sizeof(h.u))) == NULL)
198	2.07k	return (NULL);
199
200	20.6k	memcpy(&m->u, *ptr, msglen);
201	20.6k	*ptr += skip;
202	20.6k	*len -= skip;
203
204	20.6k	return (m);
205	22.7k	}
206
207		static int
208		nlmsg_read(nlmsgbuf_t m, void buf, size_t cnt)
209	15.5k	{
210	15.5k	if (cnt > m->u.nlmsg.nlmsg_len \|\|
211	15.5k	fido_buf_read((void *)&m->ptr, &m->len, buf, cnt) < 0)
212	2.05k	return (-1);
213
214	13.5k	m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len - cnt);
215
216	13.5k	return (0);
217	15.5k	}
218
219		static int
220		nlmsg_write(nlmsgbuf_t m, const void buf, size_t cnt)
221	19.1M	{
222	19.1M	if (cnt > UINT32_MAX - m->u.nlmsg.nlmsg_len \|\|
223	19.1M	fido_buf_write(&m->ptr, &m->len, buf, cnt) < 0)
224	0	return (-1);
225
226	19.1M	m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len + cnt);
227
228	19.1M	return (0);
229	19.1M	}
230
231		static int
232		nlmsg_set_genl(nlmsgbuf_t *m, uint8_t cmd)
233	2.74M	{
234	2.74M	genlmsgbuf_t g;
235
236	2.74M	memset(&g, 0, sizeof(g));
237	2.74M	g.u.genl.cmd = cmd;
238	2.74M	g.u.genl.version = NFC_GENL_VERSION;
239
240	2.74M	return (nlmsg_write(m, &g, sizeof(g)));
241	2.74M	}
242
243		static int
244		nlmsg_get_genl(nlmsgbuf_t *m, uint8_t cmd)
245	11.4k	{
246	11.4k	genlmsgbuf_t g;
247
248	11.4k	memset(&g, 0, sizeof(g));
249
250	11.4k	if (nlmsg_read(m, &g, sizeof(g)) < 0 \|\| g.u.genl.cmd != cmd)
251	3.10k	return (-1);
252
253	8.34k	return (0);
254	11.4k	}
255
256		static int
257		nlmsg_get_status(nlmsgbuf_t *m)
258	4.14k	{
259	4.14k	int status;
260
261	4.14k	if (nlmsg_read(m, &status, sizeof(status)) < 0 \|\| status == INT_MIN)
262	134	return (-1);
263	4.00k	if (status < 0)
264	538	status = -status;
265
266	4.00k	return (status);
267	4.14k	}
268
269		static int
270		nlmsg_setattr(nlmsgbuf_t m, uint16_t type, const void ptr, size_t len)
271	5.47M	{
272	5.47M	int r;
273	5.47M	char *padding;
274	5.47M	size_t skip;
275	5.47M	nlamsgbuf_t a;
276
277	5.47M	if ((skip = NLMSG_ALIGN(len)) > UINT16_MAX - sizeof(a.u) \|\|
278	5.47M	skip < len \|\| (padding = calloc(1, skip - len)) == NULL)
279	14.7k	return (-1);
280
281	5.45M	memset(&a, 0, sizeof(a));
282	5.45M	a.u.nla.nla_type = type;
283	5.45M	a.u.nla.nla_len = (uint16_t)(len + sizeof(a.u));
284	5.45M	r = nlmsg_write(m, &a.u, sizeof(a.u)) < 0 \|\|
285	5.45M	nlmsg_write(m, ptr, len) < 0 \|\|
286	5.45M	nlmsg_write(m, padding, skip - len) < 0 ? -1 : 0;
287
288	5.45M	free(padding);
289
290	5.45M	return (r);
291	5.47M	}
292
293		static int
294		nlmsg_set_u16(nlmsgbuf_t *m, uint16_t type, uint16_t val)
295	2.73M	{
296	2.73M	return (nlmsg_setattr(m, type, &val, sizeof(val)));
297	2.73M	}
298
299		static int
300		nlmsg_set_u32(nlmsgbuf_t *m, uint16_t type, uint32_t val)
301	7.80k	{
302	7.80k	return (nlmsg_setattr(m, type, &val, sizeof(val)));
303	7.80k	}
304
305		static int
306		nlmsg_set_str(nlmsgbuf_t m, uint16_t type, const char val)
307	2.72M	{
308	2.72M	return (nlmsg_setattr(m, type, val, strlen(val) + 1));
309	2.72M	}
310
311		static int
312		nla_get_u16(nlamsgbuf_t a, uint16_t v)
313	4.10k	{
314	4.10k	return (nla_read(a, v, sizeof(*v)));
315	4.10k	}
316
317		static int
318		nla_get_u32(nlamsgbuf_t a, uint32_t v)
319	5.62k	{
320	5.62k	return (nla_read(a, v, sizeof(*v)));
321	5.62k	}
322
323		static char *
324		nla_get_str(nlamsgbuf_t *a)
325	2.11k	{
326	2.11k	size_t n;
327	2.11k	char *s = NULL;
328
329	2.11k	if ((n = a->len) < 1 \|\| a->ptr[n - 1] != '\0' \|\|
330	2.11k	(s = calloc(1, n)) == NULL \|\| nla_read(a, s, n) < 0) {
331	128	free(s);
332	128	return (NULL);
333	128	}
334	1.98k	s[n - 1] = '\0';
335
336	1.98k	return (s);
337	2.11k	}
338
339		static int
340		nlmsg_tx(int fd, const nlmsgbuf_t *m)
341	2.72M	{
342	2.72M	ssize_t r;
343
344	2.72M	if ((r = WRITE(fd, nlmsg_ptr(m), nlmsg_len(m))) == -1) {
345	6.79k	fido_log_error(errno, "%s: write", __func__);
346	6.79k	return (-1);
347	6.79k	}
348	2.72M	if (r < 0 \|\| (size_t)r != nlmsg_len(m)) {
349	0	fido_log_debug("%s: %zd != %zu", __func__, r, nlmsg_len(m));
350	0	return (-1);
351	0	}
352	2.72M	fido_log_xxd(nlmsg_ptr(m), nlmsg_len(m), "%s", __func__);
353
354	2.72M	return (0);
355	2.72M	}
356
357		static ssize_t
358		nlmsg_rx(int fd, unsigned char *ptr, size_t len, int ms)
359	2.72M	{
360	2.72M	ssize_t r;
361
362	2.72M	if (len > SSIZE_MAX) {
363	0	fido_log_debug("%s: len", __func__);
364	0	return (-1);
365	0	}
366	2.72M	if (fido_hid_unix_wait(fd, ms, NULL) < 0) {
367	0	fido_log_debug("%s: fido_hid_unix_wait", __func__);
368	0	return (-1);
369	0	}
370	2.72M	if ((r = READ(fd, ptr, len)) == -1) {
371	7.37k	fido_log_error(errno, "%s: read %zd", __func__, r);
372	7.37k	return (-1);
373	7.37k	}
374	2.71M	fido_log_xxd(ptr, (size_t)r, "%s", __func__);
375
376	2.71M	return (r);
377	2.72M	}
378
379		static int
380		nlmsg_iter(nlmsgbuf_t m, void arg, int (parser)(nlamsgbuf_t , void *))
381	8.16k	{
382	8.16k	nlamsgbuf_t *a;
383	8.16k	int r;
384
385	50.0k	while ((a = nlmsg_getattr(m)) != NULL) {
386	42.6k	r = parser(a, arg);
387	42.6k	free(a);
388	42.6k	if (r < 0) {
389	704	fido_log_debug("%s: parser", __func__);
390	704	return (-1);
391	704	}
392	42.6k	}
393
394	7.46k	return (0);
395	8.16k	}
396
397		static int
398		nla_iter(nlamsgbuf_t g, void arg, int (parser)(nlamsgbuf_t , void *))
399	17.2k	{
400	17.2k	nlamsgbuf_t *a;
401	17.2k	int r;
402
403	34.5k	while ((a = nla_getattr(g)) != NULL) {
404	18.5k	r = parser(a, arg);
405	18.5k	free(a);
406	18.5k	if (r < 0) {
407	1.23k	fido_log_debug("%s: parser", __func__);
408	1.23k	return (-1);
409	1.23k	}
410	18.5k	}
411
412	16.0k	return (0);
413	17.2k	}
414
415		static int
416		nl_parse_reply(const uint8_t *blob, size_t blob_len, uint16_t msg_type,
417		uint8_t genl_cmd, void arg, int (parser)(nlamsgbuf_t , void ))
418	2.71M	{
419	2.71M	nlmsgbuf_t *m;
420	2.71M	int r;
421
422	2.73M	while (blob_len) {
423	25.9k	if ((m = nlmsg_from_buf(&blob, &blob_len)) == NULL) {
424	5.30k	fido_log_debug("%s: nlmsg", __func__);
425	5.30k	return (-1);
426	5.30k	}
427	20.6k	if (nlmsg_type(m) == NLMSG_ERROR) {
428	4.14k	r = nlmsg_get_status(m);
429	4.14k	free(m);
430	4.14k	return (r);
431	4.14k	}
432	16.5k	if (nlmsg_type(m) != msg_type \|\|
433	16.5k	nlmsg_get_genl(m, genl_cmd) < 0) {
434	8.16k	fido_log_debug("%s: skipping", __func__);
435	8.16k	free(m);
436	8.16k	continue;
437	8.16k	}
438	8.34k	if (parser != NULL && nlmsg_iter(m, arg, parser) < 0) {
439	704	fido_log_debug("%s: nlmsg_iter", __func__);
440	704	free(m);
441	704	return (-1);
442	704	}
443	7.64k	free(m);
444	7.64k	}
445
446	2.70M	return (0);
447	2.71M	}
448
449		static int
450		parse_mcastgrp(nlamsgbuf_t a, void arg)
451	8.50k	{
452	8.50k	nl_family_t *family = arg;
453	8.50k	char *name;
454
455	8.50k	switch (nla_type(a)) {
456	2.11k	case CTRL_ATTR_MCAST_GRP_NAME:
457	2.11k	if ((name = nla_get_str(a)) == NULL \|\|
458	2.11k	strcmp(name, NFC_GENL_MCAST_EVENT_NAME) != 0) {
459	572	free(name);
460	572	return (-1); /* XXX skip? */
461	572	}
462	1.53k	free(name);
463	1.53k	return (0);
464	5.30k	case CTRL_ATTR_MCAST_GRP_ID:
465	5.30k	if (family->mcastgrp)
466	1.42k	break;
467	3.88k	if (nla_get_u32(a, &family->mcastgrp) < 0) {
468	45	fido_log_debug("%s: group", __func__);
469	45	return (-1);
470	45	}
471	3.84k	return (0);
472	8.50k	}
473
474	2.50k	fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
475
476	2.50k	return (0);
477	8.50k	}
478
479		static int
480		parse_mcastgrps(nlamsgbuf_t a, void arg)
481	10.0k	{
482	10.0k	return (nla_iter(a, arg, parse_mcastgrp));
483	10.0k	}
484
485		static int
486		parse_family(nlamsgbuf_t a, void arg)
487	38.9k	{
488	38.9k	nl_family_t *family = arg;
489
490	38.9k	switch (nla_type(a)) {
491	6.06k	case CTRL_ATTR_FAMILY_ID:
492	6.06k	if (family->id)
493	1.95k	break;
494	4.10k	if (nla_get_u16(a, &family->id) < 0) {
495	64	fido_log_debug("%s: id", __func__);
496	64	return (-1);
497	64	}
498	4.04k	return (0);
499	7.21k	case CTRL_ATTR_MCAST_GROUPS:
500	7.21k	return (nla_iter(a, family, parse_mcastgrps));
501	38.9k	}
502
503	27.6k	fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
504
505	27.6k	return (0);
506	38.9k	}
507
508		static int
509		nl_get_nfc_family(int fd, uint16_t type, uint32_t mcastgrp)
510	2.74M	{
511	2.74M	nlmsgbuf_t *m;
512	2.74M	uint8_t reply[512];
513	2.74M	nl_family_t family;
514	2.74M	ssize_t r;
515	2.74M	int ok;
516
517	2.74M	if ((m = nlmsg_new(GENL_ID_CTRL, 0, 64)) == NULL \|\|
518	2.74M	nlmsg_set_genl(m, CTRL_CMD_GETFAMILY) < 0 \|\|
519	2.74M	nlmsg_set_u16(m, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL) < 0 \|\|
520	2.74M	nlmsg_set_str(m, CTRL_ATTR_FAMILY_NAME, NFC_GENL_NAME) < 0 \|\|
521	2.74M	nlmsg_tx(fd, m) < 0) {
522	28.7k	free(m);
523	28.7k	return (-1);
524	28.7k	}
525	2.71M	free(m);
526	2.71M	memset(&family, 0, sizeof(family));
527	2.71M	if ((r = nlmsg_rx(fd, reply, sizeof(reply), -1)) < 0) {
528	7.16k	fido_log_debug("%s: nlmsg_rx", __func__);
529	7.16k	return (-1);
530	7.16k	}
531	2.70M	if ((ok = nl_parse_reply(reply, (size_t)r, GENL_ID_CTRL,
532	2.70M	CTRL_CMD_NEWFAMILY, &family, parse_family)) != 0) {
533	5.69k	fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
534	5.69k	return (-1);
535	5.69k	}
536	2.70M	if (family.id == 0 \|\| family.mcastgrp == 0) {
537	2.69M	fido_log_debug("%s: missing attr", __func__);
538	2.69M	return (-1);
539	2.69M	}
540	2.97k	*type = family.id;
541	2.97k	*mcastgrp = family.mcastgrp;
542
543	2.97k	return (0);
544	2.70M	}
545
546		static int
547		parse_target(nlamsgbuf_t a, void arg)
548	916	{
549	916	nl_target_t *t = arg;
550
551	916	if (t->found \|\| nla_type(a) != NFC_ATTR_TARGET_INDEX) {
552	837	fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
553	837	return (0);
554	837	}
555	79	if (nla_get_u32(a, t->value) < 0) {
556	14	fido_log_debug("%s: target", __func__);
557	14	return (-1);
558	14	}
559	65	t->found = 1;
560
561	65	return (0);
562	79	}
563
564		int
565		fido_nl_power_nfc(fido_nl_t *nl, uint32_t dev)
566	2.97k	{
567	2.97k	nlmsgbuf_t *m;
568	2.97k	uint8_t reply[512];
569	2.97k	ssize_t r;
570	2.97k	int ok;
571
572	2.97k	if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL \|\|
573	2.97k	nlmsg_set_genl(m, NFC_CMD_DEV_UP) < 0 \|\|
574	2.97k	nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 \|\|
575	2.97k	nlmsg_tx(nl->fd, m) < 0) {
576	708	free(m);
577	708	return (-1);
578	708	}
579	2.26k	free(m);
580	2.26k	if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) {
581	166	fido_log_debug("%s: nlmsg_rx", __func__);
582	166	return (-1);
583	166	}
584	2.09k	if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
585	2.09k	NFC_CMD_DEV_UP, NULL, NULL)) != 0 && ok != EALREADY) {
586	797	fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
587	797	return (-1);
588	797	}
589
590	1.30k	return (0);
591	2.09k	}
592
593		static int
594		nl_nfc_poll(fido_nl_t *nl, uint32_t dev)
595	2.38k	{
596	2.38k	nlmsgbuf_t *m;
597	2.38k	uint8_t reply[512];
598	2.38k	ssize_t r;
599	2.38k	int ok;
600
601	2.38k	if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL \|\|
602	2.38k	nlmsg_set_genl(m, NFC_CMD_START_POLL) < 0 \|\|
603	2.38k	nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 \|\|
604	2.38k	nlmsg_set_u32(m, NFC_ATTR_PROTOCOLS, NFC_PROTO_ISO14443_MASK) < 0 \|\|
605	2.38k	nlmsg_tx(nl->fd, m) < 0) {
606	104	free(m);
607	104	return (-1);
608	104	}
609	2.28k	free(m);
610	2.28k	if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) {
611	22	fido_log_debug("%s: nlmsg_rx", __func__);
612	22	return (-1);
613	22	}
614	2.26k	if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
615	2.26k	NFC_CMD_START_POLL, NULL, NULL)) != 0) {
616	317	fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
617	317	return (-1);
618	317	}
619
620	1.94k	return (0);
621	2.26k	}
622
623		static int
624		nl_dump_nfc_target(fido_nl_t nl, uint32_t dev, uint32_t target, int ms)
625	503	{
626	503	nlmsgbuf_t *m;
627	503	nl_target_t t;
628	503	uint8_t reply[512];
629	503	ssize_t r;
630	503	int ok;
631
632	503	if ((m = nlmsg_new(nl->nfc_type, NLM_F_DUMP, 64)) == NULL \|\|
633	503	nlmsg_set_genl(m, NFC_CMD_GET_TARGET) < 0 \|\|
634	503	nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 \|\|
635	503	nlmsg_tx(nl->fd, m) < 0) {
636	21	free(m);
637	21	return (-1);
638	21	}
639	482	free(m);
640	482	if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), ms)) < 0) {
641	7	fido_log_debug("%s: nlmsg_rx", __func__);
642	7	return (-1);
643	7	}
644	475	memset(&t, 0, sizeof(t));
645	475	t.value = target;
646	475	if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
647	475	NFC_CMD_GET_TARGET, &t, parse_target)) != 0) {
648	332	fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
649	332	return (-1);
650	332	}
651	143	if (!t.found) {
652	93	fido_log_debug("%s: target not found", __func__);
653	93	return (-1);
654	93	}
655
656	50	return (0);
657	143	}
658
659		static int
660		parse_nfc_event(nlamsgbuf_t a, void arg)
661	2.72k	{
662	2.72k	nl_poll_t *ctx = arg;
663	2.72k	uint32_t dev;
664
665	2.72k	if (nla_type(a) != NFC_ATTR_DEVICE_INDEX) {
666	1.06k	fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a));
667	1.06k	return (0);
668	1.06k	}
669	1.65k	if (nla_get_u32(a, &dev) < 0) {
670	9	fido_log_debug("%s: dev", __func__);
671	9	return (-1);
672	9	}
673	1.65k	if (dev == ctx->dev)
674	731	ctx->eventcnt++;
675	919	else
676	919	fido_log_debug("%s: ignoring dev 0x%x", __func__, dev);
677
678	1.65k	return (0);
679	1.65k	}
680
681		int
682		fido_nl_get_nfc_target(fido_nl_t nl, uint32_t dev, uint32_t target)
683	2.38k	{
684	2.38k	uint8_t reply[512];
685	2.38k	nl_poll_t ctx;
686	2.38k	ssize_t r;
687	2.38k	int ok;
688
689	2.38k	if (nl_nfc_poll(nl, dev) < 0) {
690	443	fido_log_debug("%s: nl_nfc_poll", __func__);
691	443	return (-1);
692	443	}
693		#ifndef FIDO_FUZZ
694		if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
695		&nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) {
696		fido_log_error(errno, "%s: setsockopt add", __func__);
697		return (-1);
698		}
699		#endif
700	1.94k	r = nlmsg_rx(nl->fd, reply, sizeof(reply), NETLINK_POLL_MS);
701		#ifndef FIDO_FUZZ
702		if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP,
703		&nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) {
704		fido_log_error(errno, "%s: setsockopt drop", __func__);
705		return (-1);
706		}
707		#endif
708	1.94k	if (r < 0) {
709	16	fido_log_debug("%s: nlmsg_rx", __func__);
710	16	return (-1);
711	16	}
712	1.92k	memset(&ctx, 0, sizeof(ctx));
713	1.92k	ctx.dev = dev;
714	1.92k	if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type,
715	1.92k	NFC_EVENT_TARGETS_FOUND, &ctx, parse_nfc_event)) != 0) {
716	475	fido_log_debug("%s: nl_parse_reply: %d", __func__, ok);
717	475	return (-1);
718	475	}
719	1.45k	if (ctx.eventcnt == 0) {
720	951	fido_log_debug("%s: dev 0x%x not observed", __func__, dev);
721	951	return (-1);
722	951	}
723	503	if (nl_dump_nfc_target(nl, dev, target, -1) < 0) {
724	453	fido_log_debug("%s: nl_dump_nfc_target", __func__);
725	453	return (-1);
726	453	}
727
728	50	return (0);
729	503	}
730
731		void
732		fido_nl_free(fido_nl_t **nlp)
733	2.75M	{
734	2.75M	fido_nl_t *nl;
735
736	2.75M	if (nlp == NULL \|\| (nl = *nlp) == NULL)
737	0	return;
738	2.75M	if (nl->fd != -1 && close(nl->fd) == -1)
739	0	fido_log_error(errno, "%s: close", __func__);
740
741	2.75M	free(nl);
742	2.75M	*nlp = NULL;
743	2.75M	}
744
745		fido_nl_t *
746		fido_nl_new(void)
747	2.75M	{
748	2.75M	fido_nl_t *nl;
749	2.75M	int ok = -1;
750
751	2.75M	if ((nl = calloc(1, sizeof(*nl))) == NULL)
752	6.65k	return (NULL);
753	2.75M	if ((nl->fd = socket(AF_NETLINK, SOCK_RAW \| SOCK_CLOEXEC,
754	2.75M	NETLINK_GENERIC)) == -1) {
755	0	fido_log_error(errno, "%s: socket", __func__);
756	0	goto fail;
757	0	}
758	2.75M	nl->saddr.nl_family = AF_NETLINK;
759	2.75M	if (bind(nl->fd, (struct sockaddr *)&nl->saddr,
760	2.75M	sizeof(nl->saddr)) == -1) {
761	6.65k	fido_log_error(errno, "%s: bind", __func__);
762	6.65k	goto fail;
763	6.65k	}
764	2.74M	if (nl_get_nfc_family(nl->fd, &nl->nfc_type, &nl->nfc_mcastgrp) < 0) {
765	2.74M	fido_log_debug("%s: nl_get_nfc_family", __func__);
766	2.74M	goto fail;
767	2.74M	}
768
769	2.97k	ok = 0;
770	2.75M	fail:
771	2.75M	if (ok < 0)
772	2.74M	fido_nl_free(&nl);
773
774	2.75M	return (nl);
775	2.97k	}
776
777		#ifdef FIDO_FUZZ
778		void
779		set_netlink_io_functions(ssize_t (read_f)(int, void , size_t),
780		ssize_t (write_f)(int, const void , size_t))
781	10.3k	{
782	10.3k	fuzz_read = read_f;
783	10.3k	fuzz_write = write_f;
784	10.3k	}
785		#endif