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npfext_log.c revision 1.5 
      1 /*	$NetBSD: npfext_log.c,v 1.5 2018/09/29 14:41:37 rmind Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mindaugas Rasiukevicius.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: npfext_log.c,v 1.5 2018/09/29 14:41:37 rmind Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/socket.h>
     37 #include <sys/ioctl.h>
     38 #include <net/if.h>
     39 
     40 #include <stdio.h>
     41 #include <stdbool.h>
     42 #include <string.h>
     43 #include <assert.h>
     44 #include <errno.h>
     45 #include <err.h>
     46 #include <unistd.h>
     47 
     48 #include <npf.h>
     49 
     50 int		npfext_log_init(void);
     51 nl_ext_t *	npfext_log_construct(const char *);
     52 int		npfext_log_param(nl_ext_t *, const char *, const char *);
     53 
     54 int
     55 npfext_log_init(void)
     56 {
     57 	/* Nothing to initialise. */
     58 	return 0;
     59 }
     60 
     61 nl_ext_t *
     62 npfext_log_construct(const char *name)
     63 {
     64 	assert(strcmp(name, "log") == 0);
     65 	return npf_ext_construct(name);
     66 }
     67 
     68 int
     69 npfext_log_param(nl_ext_t *ext, const char *param, const char *val __unused)
     70 {
     71 	unsigned int if_idx;
     72 
     73 	assert(param != NULL);
     74 
     75 	if_idx = if_nametoindex(param);
     76 	if (if_idx == 0) {
     77 		int s;
     78 		struct ifreq ifr;
     79 		struct ifconf ifc;
     80 
     81 		if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
     82 			warn("Can't create datagram socket for `%s'", param);
     83 			return errno;
     84 		}
     85 
     86 		memset(&ifr, 0, sizeof(ifr));
     87 		strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name));
     88 		if (ioctl(s, SIOCIFCREATE, &ifr) == -1) {
     89 			warn("Can't SIOCIFCREATE `%s'", param);
     90 			close(s);
     91 			return errno;
     92 		}
     93 
     94 		memset(&ifc, 0, sizeof(ifc));
     95 		strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name));
     96 		if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
     97 			warn("Can't SIOCGIFFLAGS `%s'", param);
     98 			close(s);
     99 			return errno;
    100 		}
    101 
    102 		ifr.ifr_flags |= IFF_UP;
    103 		if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1) {
    104 			warn("Can't SIOCSIFFLAGS `%s'", param);
    105 			close(s);
    106 			return errno;
    107 		}
    108 		close(s);
    109 
    110 		if_idx = if_nametoindex(param);
    111 		if (if_idx == 0)
    112 			return EINVAL;
    113 	}
    114 	npf_ext_param_u32(ext, "log-interface", if_idx);
    115 	return 0;
    116 }
    117