freebsd-dev/sbin/hastd/proto.c
Pawel Jakub Dawidek 2b1b224d24 For functions that return -1 on failure check exactly for -1 and not for
any negative number.

MFC after:	3 days
2012-01-10 22:39:07 +00:00

447 lines
11 KiB
C

/*-
* Copyright (c) 2009-2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* 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 AUTHORS 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 AUTHORS 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/queue.h>
#include <sys/socket.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include "pjdlog.h"
#include "proto.h"
#include "proto_impl.h"
#define PROTO_CONN_MAGIC 0x907041c
struct proto_conn {
int pc_magic;
struct proto *pc_proto;
void *pc_ctx;
int pc_side;
#define PROTO_SIDE_CLIENT 0
#define PROTO_SIDE_SERVER_LISTEN 1
#define PROTO_SIDE_SERVER_WORK 2
};
static TAILQ_HEAD(, proto) protos = TAILQ_HEAD_INITIALIZER(protos);
void
proto_register(struct proto *proto, bool isdefault)
{
static bool seen_default = false;
if (!isdefault)
TAILQ_INSERT_HEAD(&protos, proto, prt_next);
else {
PJDLOG_ASSERT(!seen_default);
seen_default = true;
TAILQ_INSERT_TAIL(&protos, proto, prt_next);
}
}
static struct proto_conn *
proto_alloc(struct proto *proto, int side)
{
struct proto_conn *conn;
PJDLOG_ASSERT(proto != NULL);
PJDLOG_ASSERT(side == PROTO_SIDE_CLIENT ||
side == PROTO_SIDE_SERVER_LISTEN ||
side == PROTO_SIDE_SERVER_WORK);
conn = malloc(sizeof(*conn));
if (conn != NULL) {
conn->pc_proto = proto;
conn->pc_side = side;
conn->pc_magic = PROTO_CONN_MAGIC;
}
return (conn);
}
static void
proto_free(struct proto_conn *conn)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_side == PROTO_SIDE_CLIENT ||
conn->pc_side == PROTO_SIDE_SERVER_LISTEN ||
conn->pc_side == PROTO_SIDE_SERVER_WORK);
PJDLOG_ASSERT(conn->pc_proto != NULL);
bzero(conn, sizeof(*conn));
free(conn);
}
static int
proto_common_setup(const char *srcaddr, const char *dstaddr,
struct proto_conn **connp, int side)
{
struct proto *proto;
struct proto_conn *conn;
void *ctx;
int ret;
PJDLOG_ASSERT(side == PROTO_SIDE_CLIENT ||
side == PROTO_SIDE_SERVER_LISTEN);
TAILQ_FOREACH(proto, &protos, prt_next) {
if (side == PROTO_SIDE_CLIENT) {
if (proto->prt_client == NULL)
ret = -1;
else
ret = proto->prt_client(srcaddr, dstaddr, &ctx);
} else /* if (side == PROTO_SIDE_SERVER_LISTEN) */ {
if (proto->prt_server == NULL)
ret = -1;
else
ret = proto->prt_server(dstaddr, &ctx);
}
/*
* ret == 0 - success
* ret == -1 - dstaddr is not for this protocol
* ret > 0 - right protocol, but an error occurred
*/
if (ret >= 0)
break;
}
if (proto == NULL) {
/* Unrecognized address. */
errno = EINVAL;
return (-1);
}
if (ret > 0) {
/* An error occurred. */
errno = ret;
return (-1);
}
conn = proto_alloc(proto, side);
if (conn == NULL) {
if (proto->prt_close != NULL)
proto->prt_close(ctx);
errno = ENOMEM;
return (-1);
}
conn->pc_ctx = ctx;
*connp = conn;
return (0);
}
int
proto_client(const char *srcaddr, const char *dstaddr,
struct proto_conn **connp)
{
return (proto_common_setup(srcaddr, dstaddr, connp, PROTO_SIDE_CLIENT));
}
int
proto_connect(struct proto_conn *conn, int timeout)
{
int ret;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_side == PROTO_SIDE_CLIENT);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_connect != NULL);
PJDLOG_ASSERT(timeout >= -1);
ret = conn->pc_proto->prt_connect(conn->pc_ctx, timeout);
if (ret != 0) {
errno = ret;
return (-1);
}
return (0);
}
int
proto_connect_wait(struct proto_conn *conn, int timeout)
{
int ret;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_side == PROTO_SIDE_CLIENT);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_connect_wait != NULL);
PJDLOG_ASSERT(timeout >= 0);
ret = conn->pc_proto->prt_connect_wait(conn->pc_ctx, timeout);
if (ret != 0) {
errno = ret;
return (-1);
}
return (0);
}
int
proto_server(const char *addr, struct proto_conn **connp)
{
return (proto_common_setup(NULL, addr, connp, PROTO_SIDE_SERVER_LISTEN));
}
int
proto_accept(struct proto_conn *conn, struct proto_conn **newconnp)
{
struct proto_conn *newconn;
int ret;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_side == PROTO_SIDE_SERVER_LISTEN);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_accept != NULL);
newconn = proto_alloc(conn->pc_proto, PROTO_SIDE_SERVER_WORK);
if (newconn == NULL)
return (-1);
ret = conn->pc_proto->prt_accept(conn->pc_ctx, &newconn->pc_ctx);
if (ret != 0) {
proto_free(newconn);
errno = ret;
return (-1);
}
*newconnp = newconn;
return (0);
}
int
proto_send(const struct proto_conn *conn, const void *data, size_t size)
{
int ret;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_send != NULL);
ret = conn->pc_proto->prt_send(conn->pc_ctx, data, size, -1);
if (ret != 0) {
errno = ret;
return (-1);
}
return (0);
}
int
proto_recv(const struct proto_conn *conn, void *data, size_t size)
{
int ret;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_recv != NULL);
ret = conn->pc_proto->prt_recv(conn->pc_ctx, data, size, NULL);
if (ret != 0) {
errno = ret;
return (-1);
}
return (0);
}
int
proto_connection_send(const struct proto_conn *conn, struct proto_conn *mconn)
{
const char *protoname;
int ret, fd;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_send != NULL);
PJDLOG_ASSERT(mconn != NULL);
PJDLOG_ASSERT(mconn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(mconn->pc_proto != NULL);
fd = proto_descriptor(mconn);
PJDLOG_ASSERT(fd >= 0);
protoname = mconn->pc_proto->prt_name;
PJDLOG_ASSERT(protoname != NULL);
ret = conn->pc_proto->prt_send(conn->pc_ctx, protoname,
strlen(protoname) + 1, fd);
proto_close(mconn);
if (ret != 0) {
errno = ret;
return (-1);
}
return (0);
}
int
proto_connection_recv(const struct proto_conn *conn, bool client,
struct proto_conn **newconnp)
{
char protoname[128];
struct proto *proto;
struct proto_conn *newconn;
int ret, fd;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_recv != NULL);
PJDLOG_ASSERT(newconnp != NULL);
bzero(protoname, sizeof(protoname));
ret = conn->pc_proto->prt_recv(conn->pc_ctx, protoname,
sizeof(protoname) - 1, &fd);
if (ret != 0) {
errno = ret;
return (-1);
}
PJDLOG_ASSERT(fd >= 0);
TAILQ_FOREACH(proto, &protos, prt_next) {
if (strcmp(proto->prt_name, protoname) == 0)
break;
}
if (proto == NULL) {
errno = EINVAL;
return (-1);
}
newconn = proto_alloc(proto,
client ? PROTO_SIDE_CLIENT : PROTO_SIDE_SERVER_WORK);
if (newconn == NULL)
return (-1);
PJDLOG_ASSERT(newconn->pc_proto->prt_wrap != NULL);
ret = newconn->pc_proto->prt_wrap(fd, client, &newconn->pc_ctx);
if (ret != 0) {
proto_free(newconn);
errno = ret;
return (-1);
}
*newconnp = newconn;
return (0);
}
int
proto_descriptor(const struct proto_conn *conn)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_descriptor != NULL);
return (conn->pc_proto->prt_descriptor(conn->pc_ctx));
}
bool
proto_address_match(const struct proto_conn *conn, const char *addr)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_address_match != NULL);
return (conn->pc_proto->prt_address_match(conn->pc_ctx, addr));
}
void
proto_local_address(const struct proto_conn *conn, char *addr, size_t size)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_local_address != NULL);
conn->pc_proto->prt_local_address(conn->pc_ctx, addr, size);
}
void
proto_remote_address(const struct proto_conn *conn, char *addr, size_t size)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_remote_address != NULL);
conn->pc_proto->prt_remote_address(conn->pc_ctx, addr, size);
}
int
proto_timeout(const struct proto_conn *conn, int timeout)
{
struct timeval tv;
int fd;
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
fd = proto_descriptor(conn);
if (fd == -1)
return (-1);
tv.tv_sec = timeout;
tv.tv_usec = 0;
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) == -1)
return (-1);
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1)
return (-1);
return (0);
}
void
proto_close(struct proto_conn *conn)
{
PJDLOG_ASSERT(conn != NULL);
PJDLOG_ASSERT(conn->pc_magic == PROTO_CONN_MAGIC);
PJDLOG_ASSERT(conn->pc_proto != NULL);
PJDLOG_ASSERT(conn->pc_proto->prt_close != NULL);
conn->pc_proto->prt_close(conn->pc_ctx);
proto_free(conn);
}