freebsd-dev/usr.sbin/ctld/isns.c
2015-04-14 18:13:55 +00:00

253 lines
6.2 KiB
C

/*-
* Copyright (c) 2014 Alexander Motin <mav@FreeBSD.org>
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/endian.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ctld.h"
#include "isns.h"
struct isns_req *
isns_req_alloc(void)
{
struct isns_req *req;
req = calloc(sizeof(struct isns_req), 1);
if (req == NULL) {
log_err(1, "calloc");
return (NULL);
}
req->ir_buflen = sizeof(struct isns_hdr);
req->ir_usedlen = 0;
req->ir_buf = calloc(req->ir_buflen, 1);
if (req->ir_buf == NULL) {
free(req);
log_err(1, "calloc");
return (NULL);
}
return (req);
}
struct isns_req *
isns_req_create(uint16_t func, uint16_t flags)
{
struct isns_req *req;
struct isns_hdr *hdr;
req = isns_req_alloc();
req->ir_usedlen = sizeof(struct isns_hdr);
hdr = (struct isns_hdr *)req->ir_buf;
be16enc(hdr->ih_version, ISNS_VERSION);
be16enc(hdr->ih_function, func);
be16enc(hdr->ih_flags, flags);
return (req);
}
void
isns_req_free(struct isns_req *req)
{
free(req->ir_buf);
free(req);
}
static int
isns_req_getspace(struct isns_req *req, uint32_t len)
{
void *newbuf;
int newlen;
if (req->ir_usedlen + len <= req->ir_buflen)
return (0);
newlen = 1 << flsl(req->ir_usedlen + len);
newbuf = realloc(req->ir_buf, newlen);
if (newbuf == NULL) {
log_err(1, "realloc");
return (1);
}
req->ir_buf = newbuf;
req->ir_buflen = newlen;
return (0);
}
void
isns_req_add(struct isns_req *req, uint32_t tag, uint32_t len,
const void *value)
{
struct isns_tlv *tlv;
uint32_t vlen;
vlen = len + ((len & 3) ? (4 - (len & 3)) : 0);
isns_req_getspace(req, sizeof(*tlv) + vlen);
tlv = (struct isns_tlv *)&req->ir_buf[req->ir_usedlen];
be32enc(tlv->it_tag, tag);
be32enc(tlv->it_length, vlen);
memcpy(tlv->it_value, value, len);
if (vlen != len)
memset(&tlv->it_value[len], 0, vlen - len);
req->ir_usedlen += sizeof(*tlv) + vlen;
}
void
isns_req_add_delim(struct isns_req *req)
{
isns_req_add(req, 0, 0, NULL);
}
void
isns_req_add_str(struct isns_req *req, uint32_t tag, const char *value)
{
isns_req_add(req, tag, strlen(value) + 1, value);
}
void
isns_req_add_32(struct isns_req *req, uint32_t tag, uint32_t value)
{
uint32_t beval;
be32enc(&beval, value);
isns_req_add(req, tag, sizeof(value), &beval);
}
void
isns_req_add_addr(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
{
struct sockaddr_in *in4;
struct sockaddr_in6 *in6;
uint8_t buf[16];
switch (ai->ai_addr->sa_family) {
case AF_INET:
in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
memset(buf, 0, 10);
buf[10] = 0xff;
buf[11] = 0xff;
memcpy(&buf[12], &in4->sin_addr, sizeof(in4->sin_addr));
isns_req_add(req, tag, sizeof(buf), buf);
break;
case AF_INET6:
in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
isns_req_add(req, tag, sizeof(in6->sin6_addr), &in6->sin6_addr);
break;
default:
log_errx(1, "Unsupported address family %d",
ai->ai_addr->sa_family);
}
}
void
isns_req_add_port(struct isns_req *req, uint32_t tag, struct addrinfo *ai)
{
struct sockaddr_in *in4;
struct sockaddr_in6 *in6;
uint32_t buf;
switch (ai->ai_addr->sa_family) {
case AF_INET:
in4 = (struct sockaddr_in *)(void *)ai->ai_addr;
be32enc(&buf, ntohs(in4->sin_port));
isns_req_add(req, tag, sizeof(buf), &buf);
break;
case AF_INET6:
in6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
be32enc(&buf, ntohs(in6->sin6_port));
isns_req_add(req, tag, sizeof(buf), &buf);
break;
default:
log_errx(1, "Unsupported address family %d",
ai->ai_addr->sa_family);
}
}
int
isns_req_send(int s, struct isns_req *req)
{
struct isns_hdr *hdr;
int res;
hdr = (struct isns_hdr *)req->ir_buf;
be16enc(hdr->ih_length, req->ir_usedlen - sizeof(*hdr));
be16enc(hdr->ih_flags, be16dec(hdr->ih_flags) |
ISNS_FLAG_LAST | ISNS_FLAG_FIRST);
be16enc(hdr->ih_transaction, 0);
be16enc(hdr->ih_sequence, 0);
res = write(s, req->ir_buf, req->ir_usedlen);
return ((res < 0) ? -1 : 0);
}
int
isns_req_receive(int s, struct isns_req *req)
{
struct isns_hdr *hdr;
ssize_t res, len;
req->ir_usedlen = 0;
isns_req_getspace(req, sizeof(*hdr));
res = read(s, req->ir_buf, sizeof(*hdr));
if (res < (ssize_t)sizeof(*hdr))
return (-1);
req->ir_usedlen = sizeof(*hdr);
hdr = (struct isns_hdr *)req->ir_buf;
if (be16dec(hdr->ih_version) != ISNS_VERSION)
return (-1);
if ((be16dec(hdr->ih_flags) & (ISNS_FLAG_LAST | ISNS_FLAG_FIRST)) !=
(ISNS_FLAG_LAST | ISNS_FLAG_FIRST))
return (-1);
len = be16dec(hdr->ih_length);
isns_req_getspace(req, len);
res = read(s, &req->ir_buf[req->ir_usedlen], len);
if (res < len)
return (-1);
req->ir_usedlen += len;
return (0);
}
uint32_t
isns_req_get_status(struct isns_req *req)
{
if (req->ir_usedlen < sizeof(struct isns_hdr) + 4)
return (-1);
return (be32dec(&req->ir_buf[sizeof(struct isns_hdr)]));
}