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util.c
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util.c
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/* Copyright (c) 2014, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 ''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 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 <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <fcntl.h>
#include <ctype.h>
#include "ottery.h"
#include "util.h"
#include "logger.h"
static int
rdns_make_socket_nonblocking (int fd)
{
int ofl;
ofl = fcntl (fd, F_GETFL, 0);
if (fcntl (fd, F_SETFL, ofl | O_NONBLOCK) == -1) {
return -1;
}
return 0;
}
static int
rdns_make_inet_socket (int type, struct addrinfo *addr)
{
int fd, r, s_error;
socklen_t optlen;
struct addrinfo *cur;
cur = addr;
while (cur) {
/* Create socket */
fd = socket (cur->ai_family, type, 0);
if (fd == -1) {
goto out;
}
if (rdns_make_socket_nonblocking (fd) < 0) {
goto out;
}
/* Set close on exec */
if (fcntl (fd, F_SETFD, FD_CLOEXEC) == -1) {
goto out;
}
r = connect (fd, cur->ai_addr, cur->ai_addrlen);
if (r == -1) {
if (errno != EINPROGRESS) {
goto out;
}
}
else {
/* Still need to check SO_ERROR on socket */
optlen = sizeof (s_error);
getsockopt (fd, SOL_SOCKET, SO_ERROR, (void *)&s_error, &optlen);
if (s_error) {
errno = s_error;
goto out;
}
}
break;
out:
if (fd != -1) {
close (fd);
}
fd = -1;
cur = cur->ai_next;
}
return (fd);
}
static int
rdns_make_unix_socket (const char *path, struct sockaddr_un *addr, int type)
{
int fd = -1, s_error, r, serrno;
socklen_t optlen;
if (path == NULL) {
return -1;
}
addr->sun_family = AF_UNIX;
memset (addr->sun_path, 0, sizeof (addr->sun_path));
memccpy (addr->sun_path, path, 0, sizeof (addr->sun_path) - 1);
#ifdef FREEBSD
addr->sun_len = SUN_LEN (addr);
#endif
fd = socket (PF_LOCAL, type, 0);
if (fd == -1) {
return -1;
}
if (rdns_make_socket_nonblocking (fd) < 0) {
goto out;
}
/* Set close on exec */
if (fcntl (fd, F_SETFD, FD_CLOEXEC) == -1) {
goto out;
}
r = connect (fd, (struct sockaddr *)addr, SUN_LEN (addr));
if (r == -1) {
if (errno != EINPROGRESS) {
goto out;
}
}
else {
/* Still need to check SO_ERROR on socket */
optlen = sizeof (s_error);
getsockopt (fd, SOL_SOCKET, SO_ERROR, (void *)&s_error, &optlen);
if (s_error) {
errno = s_error;
goto out;
}
}
return (fd);
out:
serrno = errno;
if (fd != -1) {
close (fd);
}
errno = serrno;
return (-1);
}
/**
* Make a universal socket
* @param credits host, ip or path to unix socket
* @param port port (used for network sockets)
* @param async make this socket asynced
* @param is_server make this socket as server socket
* @param try_resolve try name resolution for a socket (BLOCKING)
*/
int
rdns_make_client_socket (const char *credits, uint16_t port,
int type)
{
struct sockaddr_un un;
struct stat st;
struct addrinfo hints, *res;
int r;
char portbuf[8];
if (*credits == '/') {
r = stat (credits, &st);
if (r == -1) {
/* Unix socket doesn't exists it must be created first */
errno = ENOENT;
return -1;
}
else {
if ((st.st_mode & S_IFSOCK) == 0) {
/* Path is not valid socket */
errno = EINVAL;
return -1;
}
else {
return rdns_make_unix_socket (credits, &un, type);
}
}
}
else {
/* TCP related part */
memset (&hints, 0, sizeof (hints));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = type; /* Type of the socket */
hints.ai_flags = 0;
hints.ai_protocol = 0; /* Any protocol */
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
hints.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
snprintf (portbuf, sizeof (portbuf), "%d", (int)port);
if ((r = getaddrinfo (credits, portbuf, &hints, &res)) == 0) {
r = rdns_make_inet_socket (type, res);
freeaddrinfo (res);
return r;
}
else {
return -1;
}
}
/* Not reached */
return -1;
}
const char *
rdns_strerror (enum dns_rcode rcode)
{
rcode &= 0xf;
static char numbuf[16];
if ('\0' == dns_rcodes[rcode][0]) {
snprintf (numbuf, sizeof (numbuf), "UNKNOWN: %d", (int)rcode);
return numbuf;
}
return dns_rcodes[rcode];
}
const char *
rdns_strtype (enum rdns_request_type type)
{
return dns_types[type];
}
uint16_t
rdns_permutor_generate_id (void)
{
uint16_t id;
id = ottery_rand_unsigned ();
return id;
}
void
rdns_reply_free (struct rdns_reply *rep)
{
struct rdns_reply_entry *entry, *tmp;
LL_FOREACH_SAFE (rep->entries, entry, tmp) {
switch (entry->type) {
case RDNS_REQUEST_PTR:
free (entry->content.ptr.name);
break;
case RDNS_REQUEST_NS:
free (entry->content.ns.name);
break;
case RDNS_REQUEST_MX:
free (entry->content.mx.name);
break;
case RDNS_REQUEST_TXT:
case RDNS_REQUEST_SPF:
free (entry->content.txt.data);
break;
case RDNS_REQUEST_SRV:
free (entry->content.srv.target);
break;
case RDNS_REQUEST_TLSA:
free (entry->content.tlsa.data);
break;
case RDNS_REQUEST_SOA:
free (entry->content.soa.mname);
free (entry->content.soa.admin);
break;
}
free (entry);
}
free (rep);
}
void
rdns_request_free (struct rdns_request *req)
{
unsigned int i;
if (req != NULL) {
if (req->packet != NULL) {
free (req->packet);
}
for (i = 0; i < req->qcount; i ++) {
free (req->requested_names[i].name);
}
if (req->requested_names != NULL) {
free (req->requested_names);
}
if (req->reply != NULL) {
rdns_reply_free (req->reply);
}
if (req->state >= RDNS_REQUEST_SENT &&
req->state < RDNS_REQUEST_REPLIED) {
/* Remove timer */
req->async->del_timer (req->async->data,
req->async_event);
/* Remove from id hashes */
HASH_DEL (req->io->requests, req);
}
else if (req->state == RDNS_REQUEST_REGISTERED) {
/* Remove retransmit event */
req->async->del_write (req->async->data,
req->async_event);
}
#ifdef TWEETNACL
if (req->curve_plugin_data != NULL) {
req->resolver->curve_plugin->cb.curve_plugin.finish_cb (
req, req->resolver->curve_plugin->data);
}
#endif
if (req->io != NULL && req->state > RDNS_REQUEST_NEW) {
REF_RELEASE (req->io);
REF_RELEASE (req->resolver);
}
free (req);
}
}
void
rdns_ioc_free (struct rdns_io_channel *ioc)
{
struct rdns_request *req, *rtmp;
HASH_ITER (hh, ioc->requests, req, rtmp) {
REF_RELEASE (req);
}
ioc->resolver->async->del_read (ioc->resolver->async->data,
ioc->async_io);
close (ioc->sock);
free (ioc);
}
void
rdns_resolver_release (struct rdns_resolver *resolver)
{
REF_RELEASE (resolver);
}
struct rdns_request*
rdns_request_retain (struct rdns_request *req)
{
REF_RETAIN (req);
return req;
}
void
rdns_request_release (struct rdns_request *req)
{
REF_RELEASE (req);
}
static bool
rdns_resolver_conf_process_line (struct rdns_resolver *resolver, char *line)
{
char *p, *c;
bool has_obrace = false;
unsigned int port = dns_port;
if (strncmp (line, "nameserver", sizeof ("nameserver") - 1) == 0) {
p = line + sizeof ("nameserver") - 1;
/* Skip spaces */
while (*p == ' ' || *p == '\t') {
p ++;
}
if (*p == '[') {
has_obrace = true;
p ++;
}
if (isxdigit (*p)) {
c = p;
while (isxdigit (*p) || *p == ':' || *p == '.') {
p ++;
}
if (has_obrace && *p != ']') {
return false;
}
else if (*p != '\0' && *p != '\n') {
return false;
}
*p = '\0';
if (has_obrace) {
p ++;
if (*p == ':') {
/* Maybe we have a port definition */
port = strtoul (p + 1, NULL, 10);
if (port == 0 || port > UINT16_MAX) {
return false;
}
}
}
return rdns_resolver_add_server (resolver, c, port, 0, default_io_cnt);
}
else {
return false;
}
}
/* XXX: skip unknown resolv.conf lines */
return true;
}
bool
rdns_resolver_parse_resolv_conf (struct rdns_resolver *resolver, const char *path)
{
FILE *in;
char buf[BUFSIZ];
in = fopen (path, "r");
if (in == NULL) {
return false;
}
while (!feof (in)) {
if (fgets (buf, sizeof (buf), in) == NULL) {
break;
}
if (!rdns_resolver_conf_process_line (resolver, buf)) {
rdns_warn ("rdns_resolver_parse_resolv_conf: cannot parse line: %s", buf);
fclose (in);
return false;
}
}
fclose (in);
return true;
}
bool
rdns_request_has_type (struct rdns_request *req, enum rdns_request_type type)
{
unsigned int i;
for (i = 0; i < req->qcount; i ++) {
if (req->requested_names[i].type == type) {
return true;
}
}
return false;
}
const struct rdns_request_name *
rdns_request_get_name (struct rdns_request *req, unsigned int *count)
{
if (count != NULL) {
*count = req->qcount;
}
return req->requested_names;
}
char *
rdns_generate_ptr_from_str (const char *str)
{
union {
struct in_addr v4;
struct in6_addr v6;
} addr;
char *res = NULL;
unsigned char *bytes;
size_t len;
if (inet_pton (AF_INET, str, &addr.v4) == 1) {
bytes = (unsigned char *)&addr.v4;
len = 4 * 4 + sizeof ("in-addr.arpa");
res = malloc (len);
if (res) {
snprintf (res, len, "%u.%u.%u.%u.in-addr.arpa",
(unsigned)bytes[3]&0xFF,
(unsigned)bytes[2]&0xFF,
(unsigned)bytes[1]&0xFF,
(unsigned)bytes[0]&0xFF);
}
}
else if (inet_pton (AF_INET6, str, &addr.v6) == 1) {
bytes = (unsigned char *)&addr.v6;
len = 2*32 + sizeof ("ip6.arpa");
res = malloc (len);
if (res) {
snprintf(res, len,
"%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x."
"%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.ip6.arpa",
bytes[15]&0xF, bytes[15] >> 4, bytes[14]&0xF, bytes[14] >> 4,
bytes[13]&0xF, bytes[13] >> 4, bytes[12]&0xF, bytes[12] >> 4,
bytes[11]&0xF, bytes[11] >> 4, bytes[10]&0xF, bytes[10] >> 4,
bytes[9]&0xF, bytes[9] >> 4, bytes[8]&0xF, bytes[8] >> 4,
bytes[7]&0xF, bytes[7] >> 4, bytes[6]&0xF, bytes[6] >> 4,
bytes[5]&0xF, bytes[5] >> 4, bytes[4]&0xF, bytes[4] >> 4,
bytes[3]&0xF, bytes[3] >> 4, bytes[2]&0xF, bytes[2] >> 4,
bytes[1]&0xF, bytes[1] >> 4, bytes[0]&0xF, bytes[0] >> 4);
}
}
return res;
}