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1205 lines
24 KiB
C
1205 lines
24 KiB
C
/*
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* wprobe.c: Wireless probe user space library
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* Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <math.h>
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#include <linux/wprobe.h>
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#include <netlink/netlink.h>
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#include <netlink/attr.h>
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#include <netlink/genl/genl.h>
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#ifndef NO_LOCAL_ACCESS
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#include <netlink/genl/ctrl.h>
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#include <netlink/genl/family.h>
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#include <endian.h>
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#endif
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#include "wprobe.h"
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#define DEBUG 1
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#ifdef DEBUG
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#define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
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#else
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#define DPRINTF(fmt, ...) do {} while (0)
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#endif
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#if defined(BYTE_ORDER) && !defined(__BYTE_ORDER)
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#define __BIG_ENDIAN BIG_ENDIAN
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#define __BYTE_ORDER BYTE_ORDER
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#endif
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#ifndef __BYTE_ORDER
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#error Unknown endian type
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#endif
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#define WPROBE_MAX_MSGLEN 65536
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static inline __u16 __swab16(__u16 x)
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{
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return x<<8 | x>>8;
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}
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static inline __u32 __swab32(__u32 x)
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{
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return x<<24 | x>>24 |
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(x & (__u32)0x0000ff00UL)<<8 |
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(x & (__u32)0x00ff0000UL)>>8;
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}
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static inline __u64 __swab64(__u64 x)
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{
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return x<<56 | x>>56 |
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(x & (__u64)0x000000000000ff00ULL)<<40 |
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(x & (__u64)0x0000000000ff0000ULL)<<24 |
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(x & (__u64)0x00000000ff000000ULL)<< 8 |
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(x & (__u64)0x000000ff00000000ULL)>> 8 |
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(x & (__u64)0x0000ff0000000000ULL)>>24 |
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(x & (__u64)0x00ff000000000000ULL)>>40;
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}
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define SWAP16(var) var = __swab16(var)
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#define SWAP32(var) var = __swab32(var)
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#define SWAP64(var) var = __swab64(var)
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#else
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#define SWAP16(var) do {} while(0)
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#define SWAP32(var) do {} while(0)
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#define SWAP64(var) do {} while(0)
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#endif
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int wprobe_port = 17990;
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static struct nlattr *tb[WPROBE_ATTR_LAST+1];
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static struct nla_policy attribute_policy[WPROBE_ATTR_LAST+1] = {
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[WPROBE_ATTR_ID] = { .type = NLA_U32 },
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[WPROBE_ATTR_MAC] = { .type = NLA_UNSPEC, .minlen = 6, .maxlen = 6 },
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[WPROBE_ATTR_NAME] = { .type = NLA_STRING },
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[WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
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[WPROBE_ATTR_TYPE] = { .type = NLA_U8 },
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[WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
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[WPROBE_VAL_S8] = { .type = NLA_U8 },
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[WPROBE_VAL_S16] = { .type = NLA_U16 },
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[WPROBE_VAL_S32] = { .type = NLA_U32 },
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[WPROBE_VAL_S64] = { .type = NLA_U64 },
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[WPROBE_VAL_U8] = { .type = NLA_U8 },
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[WPROBE_VAL_U16] = { .type = NLA_U16 },
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[WPROBE_VAL_U32] = { .type = NLA_U32 },
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[WPROBE_VAL_U64] = { .type = NLA_U64 },
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[WPROBE_VAL_SUM] = { .type = NLA_U64 },
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[WPROBE_VAL_SUM_SQ] = { .type = NLA_U64 },
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[WPROBE_VAL_SAMPLES] = { .type = NLA_U32 },
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[WPROBE_VAL_SCALE_TIME] = { .type = NLA_U64 },
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[WPROBE_ATTR_INTERVAL] = { .type = NLA_U64 },
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[WPROBE_ATTR_SAMPLES_MIN] = { .type = NLA_U32 },
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[WPROBE_ATTR_SAMPLES_MAX] = { .type = NLA_U32 },
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[WPROBE_ATTR_SAMPLES_SCALE_M] = { .type = NLA_U32 },
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[WPROBE_ATTR_SAMPLES_SCALE_D] = { .type = NLA_U32 },
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[WPROBE_ATTR_FILTER_GROUP] = { .type = NLA_NESTED },
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[WPROBE_ATTR_RXCOUNT] = { .type = NLA_U64 },
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[WPROBE_ATTR_TXCOUNT] = { .type = NLA_U64 },
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};
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typedef int (*wprobe_cb_t)(struct nl_msg *, void *);
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struct wprobe_iface_ops {
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int (*send_msg)(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t cb, void *arg);
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void (*free)(struct wprobe_iface *dev);
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};
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struct wprobe_attr_cb {
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struct list_head *list;
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char *addr;
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};
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#define WPROBE_MAGIC_STR "WPROBE"
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struct wprobe_init_hdr {
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struct {
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char magic[sizeof(WPROBE_MAGIC_STR)];
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/* protocol version */
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uint8_t version;
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/* extra header length (unused for now) */
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uint16_t extra;
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} pre __attribute__((packed));
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union {
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struct {
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uint16_t genl_family;
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} v0 __attribute__((packed));
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};
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} __attribute__((packed));
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struct wprobe_msg_hdr {
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__u16 status;
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__u16 error;
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__u32 len;
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};
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enum wprobe_resp_status {
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WPROBE_MSG_DONE = 0,
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WPROBE_MSG_DATA = 1,
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};
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static inline void
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wprobe_swap_msg_hdr(struct wprobe_msg_hdr *mhdr)
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{
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SWAP16(mhdr->status);
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SWAP16(mhdr->error);
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SWAP32(mhdr->len);
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}
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static int
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save_attribute_handler(struct nl_msg *msg, void *arg)
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{
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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const char *name = "N/A";
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struct wprobe_attribute *attr;
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int type = 0;
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struct wprobe_attr_cb *cb = arg;
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nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
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genlmsg_attrlen(gnlh, 0), attribute_policy);
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if (tb[WPROBE_ATTR_NAME])
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name = nla_data(tb[WPROBE_ATTR_NAME]);
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attr = malloc(sizeof(struct wprobe_attribute) + strlen(name) + 1);
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if (!attr)
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return -1;
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memset(attr, 0, sizeof(struct wprobe_attribute));
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if (tb[WPROBE_ATTR_ID])
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attr->id = nla_get_u32(tb[WPROBE_ATTR_ID]);
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if (tb[WPROBE_ATTR_MAC] && cb->addr)
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memcpy(cb->addr, nla_data(tb[WPROBE_ATTR_MAC]), 6);
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if (tb[WPROBE_ATTR_FLAGS])
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attr->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
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if (tb[WPROBE_ATTR_TYPE])
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type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
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if ((type < WPROBE_VAL_STRING) ||
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(type > WPROBE_VAL_U64))
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type = 0;
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attr->type = type;
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strcpy(attr->name, name);
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INIT_LIST_HEAD(&attr->list);
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list_add(&attr->list, cb->list);
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return 0;
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}
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static struct nl_msg *
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wprobe_new_msg(struct wprobe_iface *dev, int cmd, bool dump)
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{
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struct nl_msg *msg;
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uint32_t flags = 0;
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msg = nlmsg_alloc_size(65536);
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if (!msg)
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return NULL;
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if (dump)
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flags |= NLM_F_DUMP;
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genlmsg_put(msg, 0, 0, dev->genl_family,
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0, flags, cmd, 0);
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NLA_PUT_STRING(msg, WPROBE_ATTR_INTERFACE, dev->ifname);
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nla_put_failure:
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return msg;
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}
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static int
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dump_attributes(struct wprobe_iface *dev, bool link, struct list_head *list, char *addr)
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{
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struct nl_msg *msg;
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struct wprobe_attr_cb cb;
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cb.list = list;
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cb.addr = addr;
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msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LIST, true);
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if (!msg)
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return -ENOMEM;
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if (link)
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NLA_PUT(msg, WPROBE_ATTR_MAC, 6, "\x00\x00\x00\x00\x00\x00");
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return dev->ops->send_msg(dev, msg, save_attribute_handler, &cb);
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nla_put_failure:
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nlmsg_free(msg);
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return -EINVAL;
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}
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static struct wprobe_iface *
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wprobe_alloc_dev(void)
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{
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struct wprobe_iface *dev;
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dev = malloc(sizeof(struct wprobe_iface));
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if (!dev)
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return NULL;
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memset(dev, 0, sizeof(struct wprobe_iface));
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dev->interval = -1;
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dev->scale_min = -1;
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dev->scale_max = -1;
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dev->scale_m = -1;
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dev->scale_d = -1;
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dev->sockfd = -1;
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INIT_LIST_HEAD(&dev->global_attr);
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INIT_LIST_HEAD(&dev->link_attr);
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INIT_LIST_HEAD(&dev->links);
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return dev;
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}
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static int
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wprobe_init_dev(struct wprobe_iface *dev)
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{
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dump_attributes(dev, false, &dev->global_attr, NULL);
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dump_attributes(dev, true, &dev->link_attr, NULL);
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return 0;
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}
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|
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#ifndef NO_LOCAL_ACCESS
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static int n_devs = 0;
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static struct nl_sock *handle = NULL;
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static struct nl_cache *cache = NULL;
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static struct genl_family *family = NULL;
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|
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static int
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error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
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{
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int *ret = arg;
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*ret = err->error;
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return NL_STOP;
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}
|
|
|
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static int
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finish_handler(struct nl_msg *msg, void *arg)
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{
|
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int *ret = arg;
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*ret = 0;
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return NL_SKIP;
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|
}
|
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|
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static int
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ack_handler(struct nl_msg *msg, void *arg)
|
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{
|
|
int *ret = arg;
|
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*ret = 0;
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return NL_STOP;
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}
|
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|
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static void
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wprobe_local_free(struct wprobe_iface *dev)
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{
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/* should not happen */
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if (n_devs == 0)
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return;
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|
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if (--n_devs != 0)
|
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return;
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|
|
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if (cache)
|
|
nl_cache_free(cache);
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if (handle)
|
|
nl_socket_free(handle);
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handle = NULL;
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cache = NULL;
|
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}
|
|
|
|
static int
|
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wprobe_local_init(void)
|
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{
|
|
int ret;
|
|
|
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if (n_devs++ > 0)
|
|
return 0;
|
|
|
|
handle = nl_socket_alloc();
|
|
if (!handle) {
|
|
DPRINTF("Failed to create handle\n");
|
|
goto err;
|
|
}
|
|
|
|
if (genl_connect(handle)) {
|
|
DPRINTF("Failed to connect to generic netlink\n");
|
|
goto err;
|
|
}
|
|
|
|
ret = genl_ctrl_alloc_cache(handle, &cache);
|
|
if (ret < 0) {
|
|
DPRINTF("Failed to allocate netlink cache\n");
|
|
goto err;
|
|
}
|
|
|
|
family = genl_ctrl_search_by_name(cache, "wprobe");
|
|
if (!family) {
|
|
DPRINTF("wprobe API not present\n");
|
|
goto err;
|
|
}
|
|
return 0;
|
|
|
|
err:
|
|
wprobe_local_free(NULL);
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static int
|
|
wprobe_local_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
|
|
{
|
|
struct nl_cb *cb;
|
|
int err = 0;
|
|
|
|
cb = nl_cb_alloc(NL_CB_DEFAULT);
|
|
if (!cb)
|
|
goto out_no_cb;
|
|
|
|
if (callback)
|
|
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback, arg);
|
|
|
|
err = nl_send_auto_complete(handle, msg);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = 1;
|
|
|
|
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
|
|
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
|
|
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
|
|
|
|
while (err > 0)
|
|
nl_recvmsgs(handle, cb);
|
|
|
|
out:
|
|
nl_cb_put(cb);
|
|
out_no_cb:
|
|
nlmsg_free(msg);
|
|
return err;
|
|
}
|
|
|
|
static const struct wprobe_iface_ops wprobe_local_ops = {
|
|
.send_msg = wprobe_local_send_msg,
|
|
.free = wprobe_local_free,
|
|
};
|
|
|
|
struct wprobe_iface *
|
|
wprobe_get_dev(const char *ifname)
|
|
{
|
|
struct wprobe_iface *dev;
|
|
|
|
if (wprobe_local_init() != 0)
|
|
return NULL;
|
|
|
|
dev = wprobe_alloc_dev();
|
|
if (!dev)
|
|
goto error_alloc;
|
|
|
|
dev->ifname = strdup(ifname);
|
|
dev->ops = &wprobe_local_ops;
|
|
dev->genl_family = genl_family_get_id(family);
|
|
|
|
if (wprobe_init_dev(dev) < 0)
|
|
goto error;
|
|
|
|
return dev;
|
|
|
|
error:
|
|
free(dev);
|
|
error_alloc:
|
|
wprobe_local_free(NULL);
|
|
return NULL;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void swap_nlmsghdr(struct nlmsghdr *nlh)
|
|
{
|
|
SWAP32(nlh->nlmsg_len);
|
|
SWAP16(nlh->nlmsg_type);
|
|
SWAP16(nlh->nlmsg_flags);
|
|
SWAP32(nlh->nlmsg_seq);
|
|
SWAP32(nlh->nlmsg_pid);
|
|
}
|
|
|
|
static void swap_genlmsghdr(struct genlmsghdr *gnlh)
|
|
{
|
|
#if 0 /* probably unnecessary */
|
|
SWAP16(gnlh->reserved);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
wprobe_swap_nested(void *data, int len, bool outgoing)
|
|
{
|
|
void *end = data + len;
|
|
|
|
while (data < end) {
|
|
struct nlattr *nla = data;
|
|
unsigned int type, len;
|
|
|
|
if (!outgoing) {
|
|
SWAP16(nla->nla_len);
|
|
SWAP16(nla->nla_type);
|
|
|
|
/* required for further sanity checks */
|
|
if (data + nla->nla_len > end)
|
|
nla->nla_len = end - data;
|
|
}
|
|
|
|
len = NLA_ALIGN(nla->nla_len);
|
|
type = nla->nla_type & NLA_TYPE_MASK;
|
|
|
|
if (type <= WPROBE_ATTR_LAST) {
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
switch(attribute_policy[type].type) {
|
|
case NLA_U16:
|
|
SWAP16(*(__u16 *)nla_data(nla));
|
|
break;
|
|
case NLA_U32:
|
|
SWAP32(*(__u32 *)nla_data(nla));
|
|
break;
|
|
case NLA_U64:
|
|
SWAP64(*(__u64 *)nla_data(nla));
|
|
break;
|
|
case NLA_NESTED:
|
|
wprobe_swap_nested(nla_data(nla), nla_len(nla), outgoing);
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
data += len;
|
|
|
|
if (outgoing) {
|
|
SWAP16(nla->nla_len);
|
|
SWAP16(nla->nla_type);
|
|
}
|
|
if (!nla->nla_len)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct nl_msg *
|
|
wprobe_msg_from_network(int socket, int len)
|
|
{
|
|
struct genlmsghdr *gnlh;
|
|
struct nlmsghdr *nlh;
|
|
struct nl_msg *msg;
|
|
void *data;
|
|
|
|
msg = nlmsg_alloc_size(len + 32);
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
nlh = nlmsg_hdr(msg);
|
|
if (read(socket, nlh, len) != len)
|
|
goto free;
|
|
|
|
swap_nlmsghdr(nlh);
|
|
if (nlh->nlmsg_len > len)
|
|
goto free;
|
|
|
|
gnlh = nlmsg_data(nlh);
|
|
swap_genlmsghdr(gnlh);
|
|
|
|
data = genlmsg_data(gnlh);
|
|
wprobe_swap_nested(data, genlmsg_len(gnlh), false);
|
|
|
|
return msg;
|
|
free:
|
|
nlmsg_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
wprobe_msg_to_network(int socket, struct nl_msg *msg)
|
|
{
|
|
struct nlmsghdr *nlh = nlmsg_hdr(msg);
|
|
struct wprobe_msg_hdr mhdr;
|
|
struct genlmsghdr *gnlh;
|
|
void *buf, *data;
|
|
int buflen, datalen;
|
|
int ret;
|
|
|
|
buflen = nlh->nlmsg_len;
|
|
buf = malloc(buflen);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
memset(&mhdr, 0, sizeof(mhdr));
|
|
mhdr.status = WPROBE_MSG_DATA;
|
|
mhdr.len = buflen;
|
|
wprobe_swap_msg_hdr(&mhdr);
|
|
write(socket, &mhdr, sizeof(mhdr));
|
|
|
|
memcpy(buf, nlh, buflen);
|
|
nlh = buf;
|
|
gnlh = nlmsg_data(nlh);
|
|
data = genlmsg_data(gnlh);
|
|
datalen = genlmsg_len(gnlh);
|
|
|
|
wprobe_swap_nested(data, datalen, true);
|
|
swap_genlmsghdr(gnlh);
|
|
swap_nlmsghdr(nlh);
|
|
ret = write(socket, buf, buflen);
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
wprobe_remote_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
|
|
{
|
|
struct wprobe_msg_hdr mhdr;
|
|
int msgs = 0;
|
|
|
|
wprobe_msg_to_network(dev->sockfd, msg);
|
|
nlmsg_free(msg);
|
|
do {
|
|
if (read(dev->sockfd, &mhdr, sizeof(mhdr)) != sizeof(mhdr)) {
|
|
DPRINTF("Failed to read response header\n");
|
|
return -1;
|
|
}
|
|
wprobe_swap_msg_hdr(&mhdr);
|
|
|
|
switch(mhdr.status) {
|
|
case WPROBE_MSG_DATA:
|
|
if (mhdr.len > WPROBE_MAX_MSGLEN) {
|
|
fprintf(stderr, "Invalid length in received response message.\n");
|
|
exit(1);
|
|
}
|
|
|
|
msg = wprobe_msg_from_network(dev->sockfd, mhdr.len);
|
|
if (!msg)
|
|
return -EINVAL;
|
|
|
|
msgs++;
|
|
callback(msg, arg);
|
|
nlmsg_free(msg);
|
|
break;
|
|
}
|
|
} while (mhdr.status != WPROBE_MSG_DONE);
|
|
|
|
if (mhdr.error)
|
|
return -mhdr.error;
|
|
else
|
|
return msgs;
|
|
}
|
|
|
|
|
|
static void
|
|
wprobe_socket_dev_free(struct wprobe_iface *dev)
|
|
{
|
|
if (dev->sockfd >= 0)
|
|
close(dev->sockfd);
|
|
}
|
|
|
|
static const struct wprobe_iface_ops wprobe_remote_ops = {
|
|
.send_msg = wprobe_remote_send_msg,
|
|
.free = wprobe_socket_dev_free,
|
|
};
|
|
|
|
|
|
#ifndef NO_LOCAL_ACCESS
|
|
int
|
|
wprobe_server_init(int socket)
|
|
{
|
|
struct wprobe_init_hdr hdr;
|
|
int ret;
|
|
|
|
ret = wprobe_local_init();
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
memcpy(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(WPROBE_MAGIC_STR));
|
|
hdr.pre.version = 0;
|
|
hdr.v0.genl_family = genl_family_get_id(family);
|
|
SWAP16(hdr.v0.genl_family);
|
|
write(socket, (unsigned char *)&hdr, sizeof(hdr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
wprobe_server_cb(struct nl_msg *msg, void *arg)
|
|
{
|
|
int *socket = arg;
|
|
int ret;
|
|
|
|
ret = wprobe_msg_to_network(*socket, msg);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int
|
|
wprobe_server_handle(int socket)
|
|
{
|
|
struct wprobe_msg_hdr mhdr;
|
|
struct nl_msg *msg;
|
|
int ret;
|
|
|
|
ret = read(socket, &mhdr, sizeof(mhdr));
|
|
if (ret != sizeof(mhdr)) {
|
|
if (ret <= 0)
|
|
return -1;
|
|
|
|
DPRINTF("Failed to read request header\n");
|
|
return -EINVAL;
|
|
}
|
|
wprobe_swap_msg_hdr(&mhdr);
|
|
|
|
switch(mhdr.status) {
|
|
case WPROBE_MSG_DATA:
|
|
if (mhdr.len > WPROBE_MAX_MSGLEN) {
|
|
DPRINTF("Invalid length in received response message.\n");
|
|
return -EINVAL;
|
|
}
|
|
msg = wprobe_msg_from_network(socket, mhdr.len);
|
|
break;
|
|
default:
|
|
DPRINTF("Invalid request header type\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (!msg) {
|
|
DPRINTF("Failed to get message\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = wprobe_local_send_msg(NULL, msg, wprobe_server_cb, &socket);
|
|
|
|
memset(&mhdr, 0, sizeof(mhdr));
|
|
mhdr.status = WPROBE_MSG_DONE;
|
|
if (ret < 0)
|
|
mhdr.error = (uint16_t) -ret;
|
|
|
|
ret = write(socket, (unsigned char *)&mhdr, sizeof(mhdr));
|
|
if (ret > 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
wprobe_server_done(void)
|
|
{
|
|
wprobe_local_free(NULL);
|
|
}
|
|
#endif
|
|
|
|
struct wprobe_iface *
|
|
wprobe_get_from_socket(int socket, const char *name)
|
|
{
|
|
struct wprobe_iface *dev;
|
|
struct wprobe_init_hdr hdr;
|
|
|
|
dev = wprobe_alloc_dev();
|
|
if (!dev)
|
|
goto out;
|
|
|
|
dev->ops = &wprobe_remote_ops;
|
|
dev->sockfd = socket;
|
|
dev->ifname = strdup(name);
|
|
|
|
/* read version and header length */
|
|
if (read(socket, &hdr.pre, sizeof(hdr.pre)) != sizeof(hdr.pre)) {
|
|
DPRINTF("Could not read header\n");
|
|
goto error;
|
|
}
|
|
|
|
/* magic not found */
|
|
if (memcmp(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(hdr.pre.magic)) != 0) {
|
|
DPRINTF("Magic does not match\n");
|
|
goto error;
|
|
}
|
|
|
|
/* unsupported version */
|
|
if (hdr.pre.version != 0) {
|
|
DPRINTF("Protocol version does not match\n");
|
|
goto error;
|
|
}
|
|
|
|
if (read(socket, &hdr.v0, sizeof(hdr.v0)) != sizeof(hdr.v0)) {
|
|
DPRINTF("Could not read header data\n");
|
|
goto error;
|
|
}
|
|
|
|
SWAP16(hdr.pre.extra);
|
|
SWAP16(hdr.v0.genl_family);
|
|
dev->genl_family = hdr.v0.genl_family;
|
|
|
|
if (wprobe_init_dev(dev) < 0) {
|
|
DPRINTF("Could not initialize device\n");
|
|
goto error;
|
|
}
|
|
|
|
out:
|
|
return dev;
|
|
|
|
error:
|
|
wprobe_free_dev(dev);
|
|
return NULL;
|
|
}
|
|
|
|
struct wprobe_iface *
|
|
wprobe_get_auto(const char *arg, char **err)
|
|
{
|
|
static struct sockaddr_in sa;
|
|
static char errbuf[512];
|
|
|
|
struct wprobe_iface *dev = NULL;
|
|
struct hostent *h;
|
|
char *devstr = strdup(arg);
|
|
char *sep = NULL;
|
|
int sock = -1;
|
|
int len;
|
|
|
|
if (err)
|
|
*err = NULL;
|
|
|
|
sep = strchr(devstr, ':');
|
|
if (!sep) {
|
|
#ifndef NO_LOCAL_ACCESS
|
|
free(devstr);
|
|
return wprobe_get_dev(arg);
|
|
#else
|
|
if (err)
|
|
*err = "Invalid argument";
|
|
goto out;
|
|
#endif
|
|
}
|
|
|
|
*sep = 0;
|
|
sep++;
|
|
|
|
sock = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (sock < 0)
|
|
goto syserr;
|
|
|
|
h = gethostbyname(devstr);
|
|
if (!h) {
|
|
sprintf(errbuf, "Host not found");
|
|
goto out_err;
|
|
}
|
|
|
|
memcpy(&sa.sin_addr, h->h_addr, h->h_length);
|
|
sa.sin_family = AF_INET;
|
|
sa.sin_port = htons(wprobe_port);
|
|
if (connect(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0)
|
|
goto syserr;
|
|
|
|
dev = wprobe_get_from_socket(sock, sep);
|
|
if (!dev) {
|
|
sprintf(errbuf, "wprobe connection initialization failed");
|
|
goto out_err;
|
|
}
|
|
goto out;
|
|
|
|
syserr:
|
|
if (err) {
|
|
strcpy(errbuf, "Connection failed: ");
|
|
len = strlen(errbuf);
|
|
strerror_r(errno, errbuf + len, sizeof(errbuf) - len - 1);
|
|
}
|
|
out_err:
|
|
if (err)
|
|
*err = errbuf;
|
|
if (sock >= 0)
|
|
close(sock);
|
|
out:
|
|
if (devstr)
|
|
free(devstr);
|
|
return dev;
|
|
}
|
|
|
|
static void
|
|
free_attr_list(struct list_head *list)
|
|
{
|
|
struct wprobe_attribute *attr, *tmp;
|
|
|
|
list_for_each_entry_safe(attr, tmp, list, list) {
|
|
list_del(&attr->list);
|
|
free(attr);
|
|
}
|
|
}
|
|
|
|
void
|
|
wprobe_free_dev(struct wprobe_iface *dev)
|
|
{
|
|
if (dev->ops->free)
|
|
dev->ops->free(dev);
|
|
free_attr_list(&dev->global_attr);
|
|
free_attr_list(&dev->link_attr);
|
|
free((void *)dev->ifname);
|
|
free(dev);
|
|
}
|
|
|
|
static struct wprobe_link *
|
|
get_link(struct list_head *list, const char *addr)
|
|
{
|
|
struct wprobe_link *l;
|
|
|
|
list_for_each_entry(l, list, list) {
|
|
if (!memcmp(l->addr, addr, 6)) {
|
|
list_del_init(&l->list);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* no previous link found, allocate a new one */
|
|
l = malloc(sizeof(struct wprobe_link));
|
|
if (!l)
|
|
goto out;
|
|
|
|
memset(l, 0, sizeof(struct wprobe_link));
|
|
memcpy(l->addr, addr, sizeof(l->addr));
|
|
INIT_LIST_HEAD(&l->list);
|
|
|
|
out:
|
|
return l;
|
|
}
|
|
|
|
struct wprobe_save_cb {
|
|
struct list_head *list;
|
|
struct list_head old_list;
|
|
};
|
|
|
|
static int
|
|
save_link_handler(struct nl_msg *msg, void *arg)
|
|
{
|
|
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
|
|
struct wprobe_link *link;
|
|
struct wprobe_save_cb *cb = arg;
|
|
const char *addr;
|
|
|
|
nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
|
|
genlmsg_attrlen(gnlh, 0), attribute_policy);
|
|
|
|
if (!tb[WPROBE_ATTR_MAC] || (nla_len(tb[WPROBE_ATTR_MAC]) != 6))
|
|
return -1;
|
|
|
|
addr = nla_data(tb[WPROBE_ATTR_MAC]);
|
|
link = get_link(&cb->old_list, addr);
|
|
if (!link)
|
|
return -1;
|
|
|
|
if (tb[WPROBE_ATTR_FLAGS])
|
|
link->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
|
|
|
|
list_add_tail(&link->list, cb->list);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
wprobe_update_links(struct wprobe_iface *dev)
|
|
{
|
|
struct wprobe_link *l, *tmp;
|
|
struct nl_msg *msg;
|
|
struct wprobe_save_cb cb;
|
|
int err;
|
|
|
|
INIT_LIST_HEAD(&cb.old_list);
|
|
list_splice_init(&dev->links, &cb.old_list);
|
|
cb.list = &dev->links;
|
|
|
|
msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LINKS, true);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
err = dev->ops->send_msg(dev, msg, save_link_handler, &cb);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
list_for_each_entry_safe(l, tmp, &cb.old_list, list) {
|
|
list_del(&l->list);
|
|
free(l);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct wprobe_filter_data
|
|
{
|
|
wprobe_filter_cb cb;
|
|
void *arg;
|
|
struct wprobe_filter_item *buf;
|
|
int buflen;
|
|
};
|
|
|
|
static int
|
|
dump_filter_handler(struct nl_msg *msg, void *arg)
|
|
{
|
|
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
|
|
struct wprobe_filter_data *data = arg;
|
|
struct nlattr *p;
|
|
const char *name;
|
|
int count = 0;
|
|
int len;
|
|
|
|
nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
|
|
genlmsg_attrlen(gnlh, 0), attribute_policy);
|
|
|
|
if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_FILTER_GROUP])
|
|
return -1;
|
|
|
|
name = nla_data(tb[WPROBE_ATTR_NAME]);
|
|
nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
|
|
count++;
|
|
}
|
|
|
|
if (data->buflen < count) {
|
|
if (data->buf)
|
|
free(data->buf);
|
|
data->buflen = count;
|
|
data->buf = malloc(sizeof(struct wprobe_filter_item) * count);
|
|
memset(data->buf, 0, sizeof(struct wprobe_filter_item) * count);
|
|
}
|
|
|
|
count = 0;
|
|
nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
|
|
struct wprobe_filter_item *fi;
|
|
|
|
nla_parse(tb, WPROBE_ATTR_LAST, nla_data(p),
|
|
nla_len(p), attribute_policy);
|
|
|
|
if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_RXCOUNT]
|
|
|| !tb[WPROBE_ATTR_TXCOUNT])
|
|
continue;
|
|
|
|
fi = &data->buf[count++];
|
|
strncpy(fi->name, nla_data(tb[WPROBE_ATTR_NAME]), sizeof(fi->name) - 1);
|
|
fi->name[sizeof(fi->name) - 1] = 0;
|
|
fi->rx = nla_get_u64(tb[WPROBE_ATTR_RXCOUNT]);
|
|
fi->tx = nla_get_u64(tb[WPROBE_ATTR_TXCOUNT]);
|
|
}
|
|
data->cb(data->arg, name, data->buf, count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
wprobe_dump_filters(struct wprobe_iface *dev, wprobe_filter_cb cb, void *arg)
|
|
{
|
|
struct wprobe_filter_data data;
|
|
struct nl_msg *msg;
|
|
int err;
|
|
|
|
data.buf = 0;
|
|
data.buflen = 0;
|
|
data.cb = cb;
|
|
data.arg = arg;
|
|
|
|
msg = wprobe_new_msg(dev, WPROBE_CMD_GET_FILTER, true);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
err = dev->ops->send_msg(dev, msg, dump_filter_handler, &data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
wprobe_apply_config(struct wprobe_iface *dev)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = wprobe_new_msg(dev, WPROBE_CMD_CONFIG, false);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
if (dev->interval >= 0)
|
|
NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
|
|
|
|
if (dev->filter_len < 0) {
|
|
NLA_PUT(msg, WPROBE_ATTR_FILTER, 0, NULL);
|
|
dev->filter_len = 0;
|
|
} else if (dev->filter && dev->filter_len > 0) {
|
|
NLA_PUT(msg, WPROBE_ATTR_FILTER, dev->filter_len, dev->filter);
|
|
}
|
|
dev->filter = NULL;
|
|
|
|
dev->ops->send_msg(dev, msg, NULL, NULL);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(msg);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int
|
|
wprobe_measure(struct wprobe_iface *dev)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = wprobe_new_msg(dev, WPROBE_CMD_MEASURE, false);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
dev->ops->send_msg(dev, msg, NULL, NULL);
|
|
return 0;
|
|
}
|
|
|
|
struct wprobe_request_cb {
|
|
struct list_head *list;
|
|
struct list_head old_list;
|
|
char *addr;
|
|
};
|
|
|
|
static int
|
|
save_attrdata_handler(struct nl_msg *msg, void *arg)
|
|
{
|
|
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
|
|
struct wprobe_request_cb *cb = arg;
|
|
struct wprobe_attribute *attr;
|
|
int type, id;
|
|
|
|
nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
|
|
genlmsg_attrlen(gnlh, 0), attribute_policy);
|
|
|
|
if (!tb[WPROBE_ATTR_ID])
|
|
return -1;
|
|
|
|
if (!tb[WPROBE_ATTR_TYPE])
|
|
return -1;
|
|
|
|
id = nla_get_u32(tb[WPROBE_ATTR_ID]);
|
|
list_for_each_entry(attr, &cb->old_list, list) {
|
|
if (attr->id == id)
|
|
goto found;
|
|
}
|
|
/* not found */
|
|
return -1;
|
|
|
|
found:
|
|
list_del_init(&attr->list);
|
|
|
|
type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
|
|
if (type != attr->type) {
|
|
DPRINTF("WARNING: type mismatch for %s attribute '%s' (%d != %d)\n",
|
|
(cb->addr ? "link" : "global"),
|
|
attr->name,
|
|
type, attr->type);
|
|
goto out;
|
|
}
|
|
|
|
if ((type < WPROBE_VAL_STRING) ||
|
|
(type > WPROBE_VAL_U64))
|
|
goto out;
|
|
|
|
memset(&attr->val, 0, sizeof(attr->val));
|
|
|
|
#define HANDLE_INT_TYPE(_idx, _type) \
|
|
case WPROBE_VAL_S##_type: \
|
|
case WPROBE_VAL_U##_type: \
|
|
attr->val.U##_type = nla_get_u##_type(tb[_idx]); \
|
|
break
|
|
|
|
switch(type) {
|
|
HANDLE_INT_TYPE(type, 8);
|
|
HANDLE_INT_TYPE(type, 16);
|
|
HANDLE_INT_TYPE(type, 32);
|
|
HANDLE_INT_TYPE(type, 64);
|
|
case WPROBE_VAL_STRING:
|
|
/* unimplemented */
|
|
break;
|
|
}
|
|
#undef HANDLE_TYPE
|
|
|
|
if (attr->flags & WPROBE_F_KEEPSTAT) {
|
|
if (tb[WPROBE_VAL_SUM])
|
|
attr->val.s = nla_get_u64(tb[WPROBE_VAL_SUM]);
|
|
|
|
if (tb[WPROBE_VAL_SUM_SQ])
|
|
attr->val.ss = nla_get_u64(tb[WPROBE_VAL_SUM_SQ]);
|
|
|
|
if (tb[WPROBE_VAL_SAMPLES])
|
|
attr->val.n = nla_get_u32(tb[WPROBE_VAL_SAMPLES]);
|
|
|
|
if (attr->val.n > 0) {
|
|
float avg = ((float) attr->val.s) / attr->val.n;
|
|
float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
|
|
if (isnan(stdev))
|
|
stdev = 0.0f;
|
|
if (isnan(avg))
|
|
avg = 0.0f;
|
|
attr->val.avg = avg;
|
|
attr->val.stdev = stdev;
|
|
}
|
|
}
|
|
|
|
out:
|
|
list_add_tail(&attr->list, cb->list);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
|
|
{
|
|
struct wprobe_request_cb cb;
|
|
struct list_head *attrs;
|
|
struct nl_msg *msg;
|
|
int err;
|
|
|
|
msg = wprobe_new_msg(dev, WPROBE_CMD_GET_INFO, true);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
if (addr) {
|
|
attrs = &dev->link_attr;
|
|
NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
|
|
} else {
|
|
attrs = &dev->global_attr;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&cb.old_list);
|
|
list_splice_init(attrs, &cb.old_list);
|
|
cb.list = attrs;
|
|
|
|
err = dev->ops->send_msg(dev, msg, save_attrdata_handler, &cb);
|
|
list_splice(&cb.old_list, attrs->prev);
|
|
return err;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(msg);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
|