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/*
** ZABBIX
** Copyright (C) 2000-2006 SIA Zabbix
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <string.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
/* Required for getpwuid */
#include <pwd.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include "common.h"
#include "comms.h"
#include "zbxsock.h"
void zbx_tcp_init(zbx_sock_t *s)
{
memset(s, 0, sizeof(zbx_sock_t));
}
/******************************************************************************
* *
* Function: zbx_tcp_connect *
* *
* Purpose: connect to external host *
* *
* Parameters: *
* *
* Return value: sockfd - open socket *
* FAIL - an error occured *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_tcp_connect(zbx_sock_t *s, char *ip, int port)
{
struct sockaddr_in myaddr_in;
struct sockaddr_in servaddr_in;
struct hostent *hp;
memset(s, 0, sizeof(zbx_sock_t));
servaddr_in.sin_family=AF_INET;
if(NULL == (hp = zbx_gethost(ip)))
{
/* zabbix_log( LOG_LEVEL_WARNING, "Cannot resolve [%s]", ip); */
return FAIL;
}
servaddr_in.sin_addr.s_addr=((struct in_addr *)(hp->h_addr))->s_addr;
servaddr_in.sin_port=htons(port);
s->socket = socket(AF_INET,SOCK_STREAM,0);
if(s->socket == -1)
{
/* zabbix_log( LOG_LEVEL_WARNING, "Cannot create socket [%s:%d] [%s]", ip, port ,strerror(errno)); */
return FAIL;
}
myaddr_in.sin_family = AF_INET;
myaddr_in.sin_port=0;
myaddr_in.sin_addr.s_addr=INADDR_ANY;
if( connect(s->socket,(struct sockaddr *)&servaddr_in,sizeof(struct sockaddr_in)) == -1 )
{
/* zabbix_log( LOG_LEVEL_WARNING, "Cannot connect to [%s:%d] [%s]", ip, port, strerror(errno)); */
zbx_tcp_close(s);
return FAIL;
}
return SUCCEED;
}
/******************************************************************************
* *
* Function: zbx_tcp_send *
* *
* Purpose: send data *
* *
* Parameters: *
* *
* Return value: SUCCEED - success *
* FAIL - an error occured *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_tcp_send(zbx_sock_t *s, char *data)
{
ssize_t i;
char header[5]="ZBXD\1";
zbx_uint64_t len64;
ssize_t written = 0;
/* Write header */
i=write(s->socket, header, 5);
if(i == -1)
{
zbx_tcp_close(s);
return FAIL;
}
len64 = (zbx_uint64_t)strlen(data);
/* Write data length */
i=write(s->socket, &len64, sizeof(len64));
if(i == -1)
{
zbx_tcp_close(s);
return FAIL;
}
while(written<strlen(data))
{
i=write(s->socket, data+written,strlen(data)-written);
if(i == -1)
{
zbx_tcp_close(s);
return FAIL;
}
written+=i;
}
return SUCCEED;
}
/******************************************************************************
* *
* Function: zbx_tcp_close *
* *
* Purpose: close open socket *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
void zbx_tcp_close(zbx_sock_t *s)
{
zbx_tcp_free(s);
if(s->socket != 0) close(s->socket);
}
/******************************************************************************
* *
* Function: zbx_tcp_close *
* *
* Purpose: close open socket *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
void zbx_tcp_free(zbx_sock_t *s)
{
if(s->buf_type == ZBX_BUF_TYPE_DYN && s->buf_dyn!=NULL)
zbx_free(s->buf_dyn);
}
/******************************************************************************
* *
* Function: zbx_tcp_recv *
* *
* Purpose: receive data *
* *
* Parameters: *
* *
* Return value: SUCCEED - success *
* FAIL - an error occured *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_tcp_recv(zbx_sock_t *s, char **data)
{
char *bufptr;
#define ZBX_STAT_BUF_LEN 2048
#define ZBX_BUF_LEN ZBX_STAT_BUF_LEN*8
ssize_t nbytes;
ssize_t read_max;
ssize_t read_bytes;
int allocated, offset;
zbx_uint64_t expected_len;
memset(s->buf_stat,0,sizeof(s->buf_stat));
s->buf_type = ZBX_BUF_TYPE_STAT;
nbytes=read(s->socket, s->buf_stat, 5);
if(nbytes==5 && strncmp(s->buf_stat,"ZBXD",4)==0 && s->buf_stat[4] == 1)
{
nbytes=read(s->socket, (void *)&expected_len, sizeof(zbx_uint64_t));
/* printf("Expected len: " ZBX_FS_UI64 "\n", expected_len);*/
/* The rest was already cleared */
memset(s->buf_stat,0,5);
nbytes = read(s->socket, s->buf_stat, sizeof(s->buf_stat) - 1 );
read_max = sizeof(s->buf_stat) - 1;
*data = s->buf_stat;
}
else
{
bufptr = s->buf_stat+strlen(s->buf_stat);
read_max = ZBX_STAT_BUF_LEN - strlen(s->buf_stat) -1;
nbytes = read(s->socket, bufptr, read_max);
expected_len = 16*1024*1024;
*data = s->buf_stat;
}
read_bytes = nbytes;
if(nbytes == read_max)
{
/* printf("Read max\n");*/
s->buf_type = ZBX_BUF_TYPE_DYN;
allocated = ZBX_BUF_LEN;
s->buf_dyn=zbx_malloc(allocated);
memset(s->buf_dyn,0,ZBX_BUF_LEN);
strnscpy(s->buf_dyn, s->buf_stat, ZBX_BUF_LEN);
offset = strlen(s->buf_dyn);
while (read_bytes<expected_len && (nbytes = read(s->socket, s->buf_stat, sizeof(s->buf_stat)-2)) != -1 && nbytes != 0)
{
s->buf_stat[nbytes]='\0';
zbx_snprintf_alloc(&s->buf_dyn, &allocated, &offset, ZBX_BUF_LEN-1, "%s", s->buf_stat);
read_bytes+=nbytes;
/* printf("Read bytes %d\n", read_bytes);*/
}
*data = s->buf_dyn;
}
if(nbytes < 0)
{
/* if(errno == EINTR)
{
zabbix_log( LOG_LEVEL_WARNING, "Read timeout");
}
else
{
zabbix_log( LOG_LEVEL_WARNING, "read() failed");
}*/
return FAIL;
}
return SUCCEED;
}
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