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authd: implement DNS module

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This commit is contained in:
William Pitcock 2016-01-06 03:52:37 -06:00
parent f3e11b1d6f
commit 8cf45447e2
6 changed files with 224 additions and 4 deletions
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2
authd/Makefile.am
View file

@ -3,5 +3,5 @@ AM_CFLAGS=$(WARNFLAGS)
AM_CPPFLAGS = -I../include -I../libratbox/include
authd_SOURCES = authd.c res.c reslib.c
authd_SOURCES = authd.c res.c reslib.c dns.c
authd_LDADD = ../libratbox/src/libratbox.la

6
authd/Makefile.in
View file

@ -107,7 +107,8 @@ CONFIG_CLEAN_FILES =
CONFIG_CLEAN_VPATH_FILES =
am__installdirs = "$(DESTDIR)$(pkglibexecdir)"
PROGRAMS = $(pkglibexec_PROGRAMS)
am_authd_OBJECTS = authd.$(OBJEXT) res.$(OBJEXT) reslib.$(OBJEXT)
am_authd_OBJECTS = authd.$(OBJEXT) res.$(OBJEXT) reslib.$(OBJEXT) \
dns.$(OBJEXT)
authd_OBJECTS = $(am_authd_OBJECTS)
authd_DEPENDENCIES = ../libratbox/src/libratbox.la
AM_V_lt = $(am__v_lt_@AM_V@)
@ -358,7 +359,7 @@ top_builddir = @top_builddir@
top_srcdir = @top_srcdir@
AM_CFLAGS = $(WARNFLAGS)
AM_CPPFLAGS = -I../include -I../libratbox/include
authd_SOURCES = authd.c res.c reslib.c
authd_SOURCES = authd.c res.c reslib.c dns.c
authd_LDADD = ../libratbox/src/libratbox.la
all: all-am
@ -454,6 +455,7 @@ distclean-compile:
-rm -f *.tab.c
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/authd.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/dns.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/res.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/reslib.Po@am__quote@

9
authd/authd.c
View file

@ -24,7 +24,9 @@
#define MAXPARA 10
rb_helper *authd_helper = NULL;
authd_cmd_handler authd_cmd_handlers[255] = {};
authd_cmd_handler authd_cmd_handlers[255] = {
['D'] = resolve_dns,
};
static void
parse_request(rb_helper *helper)
@ -103,6 +105,11 @@ main(int argc, char *argv[])
exit(1);
}
rb_set_time();
setup_signals();
init_resolver();
rb_init_prng(NULL, RB_PRNG_DEFAULT);
rb_helper_loop(authd_helper, 0);
return 0;

35
authd/authd.h Normal file
View file

@ -0,0 +1,35 @@
/* authd/dns.h - header for authd DNS functions
* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef _AUTHD_H
#define _AUTHD_H
#include <ratbox_lib.h>
#include <stdio.h>
#include "setup.h"
#include "common.h"
extern rb_helper *authd_helper;
typedef void (*authd_cmd_handler)(int parc, char *parv[]);
extern authd_cmd_handler authd_cmd_handlers[255];
#endif

137
authd/dns.c Normal file
View file

@ -0,0 +1,137 @@
/* authd/dns.h - header for authd DNS functions
* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "authd.h"
#include "dns.h"
static void
submit_dns_answer(void *userdata, struct DNSReply *reply)
{
struct dns_request *req = userdata;
char response[64] = "*";
char status = 'E';
if (reply == NULL)
{
rb_helper_write(authd_helper, "E %s E %c *\n", req->reqid, req->type);
goto cleanup;
}
switch (req->type)
{
case '4':
if (GET_SS_FAMILY(&reply->addr) == AF_INET)
{
status = 'O';
rb_inet_ntop_sock((struct sockaddr *) &reply->addr, response, sizeof(response));
}
break;
#ifdef RB_IPV6
case '6':
if (GET_SS_FAMILY(&reply->addr) == AF_INET6)
{
char tmpres[63];
rb_inet_ntop_sock((struct sockaddr *) &reply->addr, tmpres, sizeof(tmpres));
if (*tmpres == ':')
{
rb_strlcpy(response, "0", sizeof(response));
rb_strlcat(response, tmpres, sizeof(response));
}
else
rb_strlcpy(response, tmpres, sizeof(response));
status = 'O';
}
break;
#endif
case 'R':
{
struct sockaddr_in *ip, *ip_fwd;
ip = (struct sockaddr_in *) &req->addr;
ip_fwd = (struct sockaddr_in *) &reply->addr;
if(ip->sin_addr.s_addr == ip_fwd->sin_addr.s_addr && strlen(reply->h_name) < 63)
{
rb_strlcpy(response, reply->h_name, sizeof(response));
status = 'O';
}
}
break;
#ifdef RB_IPV6
case 'S':
{
struct sockaddr_in6 *ip, *ip_fwd;
ip = (struct sockaddr_in6 *) &req->addr;
ip_fwd = (struct sockaddr_in6 *) &reply->addr;
if(memcmp(&ip->sin6_addr, &ip_fwd->sin6_addr, sizeof(struct in6_addr)) == 0 && strlen(reply->h_name) < 63)
{
rb_strlcpy(response, reply->h_name, sizeof(response));
status = 'O';
}
}
break;
#endif
default:
exit(7);
}
rb_helper_write(authd_helper, "E %s %c %c %s\n", req->reqid, status, req->type, response);
cleanup:
rb_free(req);
}
void
resolve_dns(int parc, char *parv[])
{
struct dns_request *req;
char *requestid = parv[1];
char *qtype = parv[2];
char *rec = parv[3];
int type;
req = rb_malloc(sizeof(*req));
rb_strlcpy(req->reqid, requestid, sizeof(req->reqid));
req->type = *qtype;
switch (req->type)
{
case '4':
type = T_A;
if(!rb_inet_pton_sock(rec, (struct sockaddr *) &req->addr))
exit(6);
break;
case '6':
type = T_AAAA;
if(!rb_inet_pton_sock(rec, (struct sockaddr *) &req->addr))
exit(6);
break;
case 'R':
case 'S':
type = T_PTR;
break;
}
req->query.ptr = req;
req->query.callback = submit_dns_answer;
gethost_byname_type(rec, &req->query, type);
}

39
authd/dns.h Normal file
View file

@ -0,0 +1,39 @@
/* authd/dns.h - header for authd DNS functions
* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef _AUTHD_DNS_H
#define _AUTHD_DNS_H
#define DNS_REQ_IDLEN 10
#include "res.h"
#include "reslib.h"
struct dns_request
{
struct DNSQuery query;
char reqid[DNS_REQ_IDLEN];
struct rb_sockaddr_storage addr;
char type;
};
extern void resolve_dns(int parc, char *parv[]);
#endif