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lib/libnetbsd/sockaddr_snprintf.c

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/* $NetBSD: sockaddr_snprintf.c,v 1.14 2016/12/29 18:30:55 christos Exp $ */
/*-
* Copyright (c) 2004, 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#ifdef HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <util.h>
#include <libutil.h>
#include <netdb.h>
#ifdef BSD4_4
# define SALEN(sa) ((sa)->sa ## _len)
#else
# define SALEN(sa) ((unsigned)sizeof(*sa))
#endif
static int
debug_in(char *str, size_t len, const struct sockaddr_in *sin)
{
return snprintf(str, len, "sin_len=%u, sin_family=%u, sin_port=%u, "
"sin_addr.s_addr=%08x",
SALEN(sin), sin->sin_family, sin->sin_port,
sin->sin_addr.s_addr);
}
static int
debug_in6(char *str, size_t len, const struct sockaddr_in6 *sin6)
{
const uint8_t *s = sin6->sin6_addr.s6_addr;
return snprintf(str, len, "sin6_len=%u, sin6_family=%u, sin6_port=%u, "
"sin6_flowinfo=%u, "
"sin6_addr=%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:"
"%02x:%02x:%02x:%02x:%02x:%02x, sin6_scope_id=%u",
SALEN(sin6), sin6->sin6_family, sin6->sin6_port,
sin6->sin6_flowinfo, s[0x0], s[0x1], s[0x2], s[0x3], s[0x4], s[0x5],
s[0x6], s[0x7], s[0x8], s[0x9], s[0xa], s[0xb], s[0xc], s[0xd],
s[0xe], s[0xf], sin6->sin6_scope_id);
}
static int
debug_un(char *str, size_t len, const struct sockaddr_un *sun)
{
return snprintf(str, len, "sun_len=%u, sun_family=%u, sun_path=%*s",
SALEN(sun), sun->sun_family, (int)sizeof(sun->sun_path),
sun->sun_path);
}
#ifdef HAVE_NET_IF_DL_H
static int
debug_dl(char *str, size_t len, const struct sockaddr_dl *sdl)
{
const uint8_t *s = (const void *)sdl->sdl_data;
return snprintf(str, len, "sdl_len=%u, sdl_family=%u, sdl_index=%u, "
"sdl_type=%u, sdl_nlen=%u, sdl_alen=%u, sdl_slen=%u, sdl_data="
"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
SALEN(sdl), sdl->sdl_family, sdl->sdl_index,
sdl->sdl_type, sdl->sdl_nlen, sdl->sdl_alen, sdl->sdl_slen,
s[0x0], s[0x1], s[0x2], s[0x3], s[0x4], s[0x5],
s[0x6], s[0x7], s[0x8], s[0x9], s[0xa], s[0xb]);
}
#endif
int
sockaddr_snprintf(char * const sbuf, const size_t len, const char * const fmt,
const struct sockaddr * const sa)
{
const void *a = NULL;
char abuf[1024], nbuf[1024], *addr = NULL;
char Abuf[1024], pbuf[32], *name = NULL, *port = NULL;
char *ebuf = &sbuf[len - 1], *buf = sbuf;
const char *ptr, *s;
size_t salen;
int p = -1;
const struct sockaddr_in *sin4 = NULL;
const struct sockaddr_in6 *sin6 = NULL;
const struct sockaddr_un *sun = NULL;
#ifdef HAVE_NET_IF_DL_H
const struct sockaddr_dl *sdl = NULL;
char *w = NULL;
#endif
int na = 1;
#define ADDC(c) do { if (buf < ebuf) *buf++ = c; else buf++; } \
while (/*CONSTCOND*/0)
#define ADDS(p) do { for (s = p; *s; s++) ADDC(*s); } \
while (/*CONSTCOND*/0)
#define ADDNA() do { if (na) ADDS("N/A"); } \
while (/*CONSTCOND*/0)
switch (sa->sa_family) {
case AF_UNSPEC:
goto done;
case AF_LOCAL:
salen = sizeof(*sun);
sun = ((const struct sockaddr_un *)(const void *)sa);
(void)strlcpy(addr = abuf, sun->sun_path, sizeof(abuf));
break;
case AF_INET:
salen = sizeof(*sin4);
sin4 = ((const struct sockaddr_in *)(const void *)sa);
p = ntohs(sin4->sin_port);
a = &sin4->sin_addr;
break;
case AF_INET6:
salen = sizeof(*sin6);
sin6 = ((const struct sockaddr_in6 *)(const void *)sa);
p = ntohs(sin6->sin6_port);
a = &sin6->sin6_addr;
break;
#ifdef HAVE_NET_IF_DL_H
case AF_LINK:
sdl = ((const struct sockaddr_dl *)(const void *)sa);
addr = abuf;
if (sdl->sdl_slen == 0 && sdl->sdl_nlen == 0
&& sdl->sdl_alen == 0) {
salen = sizeof(*sdl);
(void)snprintf(abuf, sizeof(abuf), "link#%hu",
sdl->sdl_index);
} else {
salen = sdl->sdl_slen + sdl->sdl_nlen + sdl->sdl_alen;
if (salen < sizeof(*sdl))
salen = sizeof(*sdl);
(void)strlcpy(abuf, link_ntoa(sdl), sizeof(abuf));
if ((w = strchr(addr, ':')) != NULL) {
*w++ = '\0';
addr = w;
}
}
break;
#endif
default:
errno = EAFNOSUPPORT;
return -1;
}
if (addr == abuf)
name = addr;
if (a && getnameinfo(sa, (socklen_t)salen, addr = abuf,
(unsigned int)sizeof(abuf), NULL, 0,
NI_NUMERICHOST|NI_NUMERICSERV) != 0)
return -1;
for (ptr = fmt; *ptr; ptr++) {
if (*ptr != '%') {
ADDC(*ptr);
continue;
}
next_char:
switch (*++ptr) {
case '?':
na = 0;
goto next_char;
case 'a':
ADDS(addr);
break;
case 'p':
if (p != -1) {
(void)snprintf(nbuf, sizeof(nbuf), "%d", p);
ADDS(nbuf);
} else
ADDNA();
break;
case 'f':
(void)snprintf(nbuf, sizeof(nbuf), "%d", sa->sa_family);
ADDS(nbuf);
break;
case 'l':
(void)snprintf(nbuf, sizeof(nbuf), "%zu", salen);
ADDS(nbuf);
break;
case 'A':
if (name)
ADDS(name);
else if (!a)
ADDNA();
else {
getnameinfo(sa, (socklen_t)salen, name = Abuf,
(unsigned int)sizeof(nbuf), NULL, 0, 0);
ADDS(name);
}
break;
case 'P':
if (port)
ADDS(port);
else if (p == -1)
ADDNA();
else {
getnameinfo(sa, (socklen_t)salen, NULL, 0,
port = pbuf,
(unsigned int)sizeof(pbuf), 0);
ADDS(port);
}
break;
case 'I':
#ifdef HAVE_NET_IF_DL_H
if (sdl && addr != abuf) {
ADDS(abuf);
} else
#endif
{
ADDNA();
}
break;
case 'F':
if (sin6) {
(void)snprintf(nbuf, sizeof(nbuf), "%d",
sin6->sin6_flowinfo);
ADDS(nbuf);
break;
} else {
ADDNA();
}
break;
case 'S':
if (sin6) {
(void)snprintf(nbuf, sizeof(nbuf), "%d",
sin6->sin6_scope_id);
ADDS(nbuf);
break;
} else {
ADDNA();
}
break;
case 'R':
{
ADDNA();
}
break;
case 'D':
switch (sa->sa_family) {
case AF_LOCAL:
debug_un(nbuf, sizeof(nbuf), sun);
break;
case AF_INET:
debug_in(nbuf, sizeof(nbuf), sin4);
break;
case AF_INET6:
debug_in6(nbuf, sizeof(nbuf), sin6);
break;
#ifdef HAVE_NET_IF_DL_H
case AF_LINK:
debug_dl(nbuf, sizeof(nbuf), sdl);
break;
#endif
default:
abort();
}
ADDS(nbuf);
break;
default:
ADDC('%');
if (na == 0)
ADDC('?');
if (*ptr == '\0')
goto done;
/*FALLTHROUGH*/
case '%':
ADDC(*ptr);
break;
}
na = 1;
}
done:
if (buf < ebuf)
*buf = '\0';
else if (len != 0)
sbuf[len - 1] = '\0';
return (int)(buf - sbuf);
}