ossp-pkg/l2/l2_ch_socket.c
1.31
/*
** L2 - OSSP Logging Library
** Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
** Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
** This file is part of OSSP L2, a flexible logging library which
** can be found at http://www.ossp.org/pkg/l2/.
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AND COPYRIGHT HOLDERS AND THEIR
** 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.
**
** l2_ch_socket.c: socket channel implementation
*/
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "l2.h"
#include "l2_p.h"
#define L2_SOCKET_SABUFREAD 4096
#define L2_SOCKET_SABUFWRITE 4096
/* declare private channel configuration */
typedef struct {
sa_addr_t *saaServer;
sa_t *saServer;
long lTimeout;
char *szHost; /* IP Address or name of host to connect to */
int iProto; /* Protocol to use, IPPROTO_TCP or IPPROTO_UDP */
int iPort; /* TCP Port to connect to */
int iSocket; /* Socket descriptor used during writing */
} l2_ch_socket_t;
/* create channel */
static l2_result_t hook_create(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_socket_t *cfg = NULL;
/* allocate private channel configuration */
if ((cfg = (l2_ch_socket_t *)malloc(sizeof(l2_ch_socket_t))) == NULL)
return L2_ERR_MEM;
/* initialize configuration with reasonable defaults */
cfg->saaServer = NULL;
cfg->saServer = NULL;
cfg->lTimeout = 30;
cfg->szHost = NULL;
cfg->iProto = -1;
cfg->iPort = 0;
cfg->iSocket = -1;
/* link private channel configuration into channel context */
ctx->vp = cfg;
return L2_OK;
}
/* configure channel */
static l2_result_t hook_configure(l2_context_t *ctx, l2_channel_t *ch, const char *fmt, va_list ap)
{
l2_ch_socket_t *cfg = (l2_ch_socket_t *)ctx->vp;
char *szProtocol = NULL;
l2_param_t pa[5];
l2_result_t rv;
/* feed and call generic parameter parsing engine */
L2_PARAM_SET(pa[0], protocol, STRING, &szProtocol);
L2_PARAM_SET(pa[1], timeout, INT, &cfg->lTimeout);
L2_PARAM_SET(pa[2], host, CHARPTR, &cfg->szHost);
L2_PARAM_SET(pa[3], port, INT, &cfg->iPort);
L2_PARAM_END(pa[4]);
rv = l2_util_setparams(pa, fmt, ap);
/* translate incoming configuration parameters */
if (szProtocol != NULL) {
if (strcmp(szProtocol, "IPPROTO_UDP") == 0)
cfg->iProto = IPPROTO_UDP;
else if (strcmp(szProtocol, "IPPROTO_TCP") == 0)
cfg->iProto = IPPROTO_TCP;
else
return L2_ERR_ARG;
}
free(szProtocol);
return rv;
}
/* open channel */
static l2_result_t hook_open(l2_context_t *ctx, l2_channel_t *ch)
{
sa_rc_t rc;
l2_ch_socket_t *cfg = (l2_ch_socket_t *)ctx->vp;
/* make sure a path was set */
if (cfg->szHost == NULL)
return L2_ERR_USE;
/* create socket address */
if ((rc = sa_addr_create(&cfg->saaServer)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
if ((rc = sa_addr_u2a(cfg->saaServer, "inet://%s:%d",
cfg->szHost, cfg->iPort)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
/* create socket */
if ((rc = sa_create(&cfg->saServer)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
/* configure socket parameters */
sa_timeout(cfg->saServer, SA_TIMEOUT_ALL, cfg->lTimeout, 0);
sa_buffer (cfg->saServer, SA_BUFFER_READ, L2_SOCKET_SABUFREAD);
sa_buffer (cfg->saServer, SA_BUFFER_WRITE, L2_SOCKET_SABUFWRITE);
return L2_OK;
}
/* write to channel */
static l2_result_t hook_write(l2_context_t *ctx, l2_channel_t *ch,
l2_level_t level, const char *buf, size_t buf_size)
{
l2_ch_socket_t *cfg = (l2_ch_socket_t *)ctx->vp;
size_t sizeWrite;
size_t sizeRemain;
sa_t *sa;
sa_rc_t rc;
sa_addr_t *saa;
/* parameter checks */
assert(cfg->saServer != NULL);
/* establish connection to server */
saa = cfg->saaServer;
sa = cfg->saServer;
if ((rc = sa_connect(sa, saa)) != SA_OK) {
sa_shutdown(sa, "rw"); /* shutdown connection to server */
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
}
if (cfg->iProto == IPPROTO_TCP) {
/* write message to channel socket, but check to make */
/* sure that the whole message was successfully written */
sizeWrite = 0;
sizeRemain = buf_size;
while(sizeRemain) {
if ((rc = sa_write(sa, buf, sizeRemain, &sizeWrite)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
sizeRemain = sizeRemain - sizeWrite; /* how much is left? */
}
}
return L2_OK;
}
/* close channel */
static l2_result_t hook_close(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_socket_t *cfg = (l2_ch_socket_t *)ctx->vp;
/* parameter checks */
/* FIXME! assert(cfg->saServer->fdSocket != -1); */
/* destroy remote address */
if (cfg->saServer != NULL) {
sa_destroy(cfg->saServer);
cfg->saServer = NULL;
}
if (cfg->saaServer != NULL) {
sa_addr_destroy(cfg->saaServer);
cfg->saaServer = NULL;
}
return L2_OK;
}
/* destroy channel */
static l2_result_t hook_destroy(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_socket_t *cfg = (l2_ch_socket_t *)ctx->vp;
/* destroy channel configuration */
free(cfg);
return L2_OK;
}
/* exported channel handler structure */
l2_handler_t l2_handler_socket = {
L2_CHANNEL_OUTPUT,
hook_create,
hook_configure,
hook_open,
hook_write,
NULL,
hook_close,
hook_destroy
};
