denyhosts/clamscan/shared/clamdcom.c

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2022-10-22 18:41:00 +08:00
/*
* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2009-2013 Sourcefire, Inc.
*
* Author: aCaB
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <errno.h>
#if !defined(_WIN32)
#include <sys/socket.h>
#endif
#include "output.h"
#include "clamdcom.h"
/* Sends bytes over a socket
* Returns 0 on success */
int sendln(int sockd, const char *line, unsigned int len)
{
while (len) {
int sent = send(sockd, line, len, 0);
if (sent <= 0) {
if (sent && errno == EINTR) continue;
logg("!Can't send to clamd: %s\n", strerror(errno));
return 1;
}
line += sent;
len -= sent;
}
return 0;
}
/* Inits a RECVLN struct before it can be used in recvln() - see below */
void recvlninit(struct RCVLN *s, int sockd)
{
s->sockd = sockd;
s->bol = s->cur = s->buf;
s->r = 0;
}
/* Receives a full (terminated with \0) line from a socket
* Sets rbol to the begin of the received line, and optionally
* reol to the end of line.
* Should be called repeatedly until all input is consumed
* Returns:
* - the length of the line (a positive number) on success
* - 0 if the connection is closed
* - -1 on error
*/
int recvln(struct RCVLN *s, char **rbol, char **reol)
{
char *eol;
while (1) {
if (!s->r) {
s->r = recv(s->sockd, s->cur, sizeof(s->buf) - (s->cur - s->buf), 0);
if (s->r <= 0) {
if (s->r && errno == EINTR) {
s->r = 0;
continue;
}
if (s->r || s->cur != s->buf) {
*s->cur = '\0';
if (strcmp(s->buf, "UNKNOWN COMMAND\n"))
logg("!Communication error\n");
else
logg("!Command rejected by clamd (wrong clamd version?)\n");
return -1;
}
return 0;
}
}
if ((eol = memchr(s->cur, 0, s->r))) {
int ret = 0;
eol++;
s->r -= eol - s->cur;
*rbol = s->bol;
if (reol) *reol = eol;
ret = eol - s->bol;
if (s->r)
s->bol = s->cur = eol;
else
s->bol = s->cur = s->buf;
return ret;
}
s->r += s->cur - s->bol;
if (!eol && s->r == sizeof(s->buf)) {
logg("!Overlong reply from clamd\n");
return -1;
}
if (!eol) {
if (s->buf != s->bol) { /* old memmove sux */
memmove(s->buf, s->bol, s->r);
s->bol = s->buf;
}
s->cur = &s->bol[s->r];
s->r = 0;
}
}
}