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sysadm |
1.1 |
/*
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* Copyright (C) 1998 Mark Baysinger (mbaysing@ucsd.edu)
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* Copyright (C) 1998,1999,2000 Ross Combs (rocombs@cs.nmsu.edu)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "common/setup_before.h"
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <errno.h>
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#include "compat/strerror.h"
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#include "compat/socket.h"
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#include "compat/recv.h"
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#include "compat/send.h"
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include "compat/netinet_in.h"
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#include "compat/psock.h"
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#include "common/packet.h"
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#include "common/eventlog.h"
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#include "common/field_sizes.h"
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#include "common/network.h"
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#include "common/setup_after.h"
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extern int net_recv(int sock, void *buff, int len)
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{
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int res;
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res = psock_recv(sock, buff, len, 0);
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if (res > 0) return res;
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if (!res) return -1; /* connection closed */
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if (
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#ifdef PSOCK_EINTR
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psock_errno()==PSOCK_EINTR ||
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#endif
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#ifdef PSOCK_EAGAIN
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psock_errno()==PSOCK_EAGAIN ||
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#endif
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#ifdef PSOCK_EWOULDBLOCK
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psock_errno()==PSOCK_EWOULDBLOCK ||
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#endif
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#ifdef PSOCK_ENOMEM
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psock_errno()==PSOCK_ENOMEM ||
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#endif
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0) /* try later */
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return 0;
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if (
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#ifdef PSOCK_ENOTCONN
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psock_errno()==PSOCK_ENOTCONN ||
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#endif
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#ifdef PSOCK_ECONNRESET
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psock_errno()==PSOCK_ECONNRESET ||
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#endif
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0) {
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/* eventlog(eventlog_level_debug,__FUNCTION__,"[%d] remote host closed connection (psock_recv: %s)",sock,pstrerror(psock_errno())); */
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return -1; /* common error: close connection, but no message */
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}
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eventlog(eventlog_level_debug,__FUNCTION__,"[%d] receive error (closing connection) (psock_recv: %s)",sock,pstrerror(psock_errno()));
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return -1;
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}
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extern int net_recv_packet(int sock, t_packet * packet, unsigned int * currsize)
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{
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int addlen;
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unsigned int header_size;
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void * temp;
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if (!packet) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL packet (closing connection)",sock);
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return -1;
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}
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if (!currsize) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL currsize (closing connection)",sock);
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return -1;
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}
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if ((header_size = packet_get_header_size(packet))>=MAX_PACKET_SIZE) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] could not determine header size (closing connection)",sock);
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return -1;
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}
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if (!(temp = packet_get_raw_data_build(packet,*currsize))) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] could not obtain raw data pointer at offset %u (closing connection)",sock,*currsize);
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return -1;
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}
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if (*currsize<header_size)
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addlen = net_recv(sock, temp, header_size-*currsize);
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else {
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unsigned int total_size=packet_get_size(packet);
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if (total_size<header_size) {
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eventlog(eventlog_level_warn,__FUNCTION__,"[%d] corrupted packet received (total_size=%u currsize=%u) (closing connection)",sock,total_size,*currsize);
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return -1;
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}
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if (*currsize>=total_size) {
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eventlog(eventlog_level_warn,__FUNCTION__,"[%d] more data requested for already complete packet (total_size=%u currsize=%u) (closing connection)",sock,total_size,*currsize);
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return -1;
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}
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addlen = net_recv(sock, temp, total_size-*currsize);
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}
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if (addlen<=0) return addlen;
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*currsize += addlen;
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if (*currsize>=header_size && *currsize==packet_get_size(packet))
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return 1;
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return 0;
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}
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extern int net_send(int sock, const void *buff, int len)
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{
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int res;
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res = psock_send(sock, buff, len, 0);
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if (res > 0) return res;
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if (!res) return -1;
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if (
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#ifdef PSOCK_EINTR
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psock_errno()==PSOCK_EINTR ||
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#endif
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#ifdef PSOCK_EAGAIN
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psock_errno()==PSOCK_EAGAIN ||
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#endif
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#ifdef PSOCK_EWOULDBLOCK
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psock_errno()==PSOCK_EWOULDBLOCK ||
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#endif
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#ifdef PSOCK_ENOBUFS
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psock_errno()==PSOCK_ENOBUFS ||
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#endif
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#ifdef PSOCK_ENOMEM
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psock_errno()==PSOCK_ENOMEM ||
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#endif
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0)
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return 0; /* try again later */
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if (
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#ifdef PSOCK_EPIPE
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psock_errno()!=PSOCK_EPIPE &&
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#endif
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#ifdef PSOCK_ECONNRESET
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psock_errno()!=PSOCK_ECONNRESET &&
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#endif
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1) eventlog(eventlog_level_debug,__FUNCTION__,"[%d] could not send data (closing connection) (psock_send: %s)",sock,pstrerror(psock_errno()));
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return -1;
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}
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extern int net_send_packet(int sock, t_packet const * packet, unsigned int * currsize)
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{
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unsigned int size;
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int addlen;
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if (!packet) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL packet (closing connection)",sock);
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return -1;
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}
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if (!currsize) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL currsize (closing connection)",sock);
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return -1;
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}
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if ((size = packet_get_size(packet))<1) {
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eventlog(eventlog_level_error,__FUNCTION__,"[%d] packet to send is empty (skipping it)",sock);
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*currsize = 0;
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return 1;
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}
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addlen = net_send(sock,packet_get_raw_data_const(packet,*currsize),size-*currsize);
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if (addlen <= 0) return addlen;
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*currsize += addlen;
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/* sent all data in this packet? */
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if (size==*currsize)
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{
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*currsize = 0;
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return 1;
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}
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return 0;
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}
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