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/*
* forward.c
* potd is licensed under the BSD license:
*
* Copyright (c) 2018 Toni Uhlig <matzeton@googlemail.com>
*
* 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.
*
* - The names of its contributors may not be used to endorse or promote
* products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include "forward.h"
#include "log.h"
int fwd_init_ctx(forward_ctx **ctx)
{
assert(ctx);
if (!*ctx)
*ctx = (forward_ctx *) malloc(sizeof(**ctx));
assert(*ctx);
memset(*ctx, 0, sizeof(**ctx));
return 0;
}
int fwd_setup_client(forward_ctx *ctx, const char *host, const char *port)
{
int s;
assert(ctx);
ctx->fwd_type = FT_CLIENT;
s = socket_init_in(host, port, &ctx->ai);
if (s) {
E_GAIERR(s, "Could not initialise client forward socket");
return 1;
}
s = socket_connectaddr_in(&ctx->sock, &ctx->ai,
ctx->host_buf,
ctx->service_buf);
switch (s) {
case -1:
E_STRERR("Connection to forward socket %s:%s", host, port);
break;
case 0:
break;
default:
E_GAIERR(s, "Convert forward socket address to string");
break;
}
if (socket_close(&ctx->sock)) {
E_STRERR("Forward socket to %s:%s close",
ctx->host_buf, ctx->service_buf);
return 1;
}
return s != 0;
}
int fwd_setup_client_silent(forward_ctx *ctx, const char *host,
const char *port)
{
int s;
assert(ctx);
ctx->fwd_type = FT_CLIENT;
s = socket_init_in(host, port, &ctx->ai);
if (s) {
E_GAIERR(s, "Could not initialise client forward socket");
return 1;
}
return 0;
}
int fwd_setup_server(forward_ctx *ctx, const char *listen_addr,
const char *listen_port)
{
int s;
struct addrinfo *fwd_addr = NULL;
assert(ctx);
ctx->fwd_type = FT_SERVER;
s = socket_init_in(listen_addr, listen_port, &fwd_addr);
if (s) {
E_GAIERR(s, "Initialising server forward socket");
return 1;
}
if (socket_bind_in(&ctx->sock, &fwd_addr)) {
E_STRERR("Binding forward server socket to %s:%s",
listen_addr, listen_port);
return 1;
}
s = socket_addrtostr_in(&ctx->sock, ctx->host_buf, ctx->service_buf);
if (s) {
E_GAIERR(s, "Convert server forward socket address");
return 1;
}
return 0;
}
int fwd_validate_ctx(const forward_ctx *ctx)
{
assert(ctx);
assert(ctx->fwd_type == FT_CLIENT ||
ctx->fwd_type == FT_SERVER);
assert(ctx->sock.addr_len > 0);
assert(strnlen(ctx->host_buf, NI_MAXHOST) > 0);
assert(strnlen(ctx->service_buf, NI_MAXSERV) > 0);
return 0;
}
int fwd_connect_sock(forward_ctx *ctx, psocket *fwd_client)
{
int s;
psocket *dst;
assert(ctx);
assert(ctx->fwd_type == FT_CLIENT);
if (fwd_client) {
dst = fwd_client;
socket_clone(&ctx->sock, fwd_client);
} else {
dst = &ctx->sock;
}
if (ctx->ai) {
s = socket_connectaddr_in(dst, &ctx->ai,
ctx->host_buf,
ctx->service_buf);
switch (s) {
case -1:
E_STRERR("Connection to forward socket with fd %d",
dst->fd);
break;
case 0:
if (ctx->ai)
s = 1;
break;
default:
E_GAIERR(s, "Convert forward socket address to string");
break;
}
return s != 0;
} else {
return socket_reconnect_in(dst);
}
}
int fwd_listen_sock(forward_ctx *ctx, psocket *fwd_server)
{
psocket *dst;
assert(ctx);
assert(ctx->fwd_type == FT_SERVER);
if (fwd_server) {
dst = fwd_server;
socket_clone(&ctx->sock, fwd_server);
} else {
dst = &ctx->sock;
}
if (socket_listen_in(dst)) {
E_STRERR("Could not listen on forward server socket on %s:%s",
ctx->host_buf, ctx->service_buf);
return 1;
}
return 0;
}
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