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