/*
* Copyright (C) 2002 - 2005 Tomasz Kojm <tkojm@clamav.net>
*
* 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.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/wait.h>
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/socket.h>
#include <sys/ioctl.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
/* submitted by breiter@wolfereiter.com: do not use poll(2) on Interix */
#ifdef C_INTERIX
#undef HAVE_POLL
#undef HAVE_POLL_H
#endif
#if HAVE_POLL
#if HAVE_POLL_H
#include <poll.h>
#else /* HAVE_POLL_H */
#undef HAVE_POLL
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#endif /* HAVE_POLL_H */
#endif /* HAVE_POLL */
#include "memory.h"
#include "cfgparser.h"
#include "session.h"
#include "others.h"
#include "output.h"
#define ENV_FILE "CLAM_VIRUSEVENT_FILENAME"
#define ENV_VIRUS "CLAM_VIRUSEVENT_VIRUSNAME"
void virusaction(const char *filename, const char *virname, const struct cfgstruct *copt)
{
pid_t pid;
struct cfgstruct *cpt;
if(!(cpt = cfgopt(copt, "VirusEvent")))
return;
/* NB: we need to fork here since this function modifies the environment.
(Modifications to the env. are not reentrant, but we need to be.) */
pid = fork();
if ( pid == 0 ) {
/* child... */
char *buffer, *pt, *cmd;
cmd = strdup(cpt->strarg);
if((pt = strstr(cmd, "%v"))) {
buffer = (char *) mcalloc(strlen(cmd) + strlen(virname) + 10, sizeof(char));
*pt = 0; pt += 2;
strcpy(buffer, cmd);
strcat(buffer, virname);
strcat(buffer, pt);
free(cmd);
cmd = strdup(buffer);
free(buffer);
}
/* Allocate env vars.. to be portable env vars should not be freed */
buffer = (char *) mcalloc(strlen(ENV_FILE) + strlen(filename) + 2, sizeof(char));
sprintf(buffer, "%s=%s", ENV_FILE, filename);
putenv(buffer);
buffer = (char *) mcalloc(strlen(ENV_VIRUS) + strlen(virname) + 2, sizeof(char));
sprintf(buffer, "%s=%s", ENV_VIRUS, virname);
putenv(buffer);
/* WARNING: this is uninterruptable ! */
exit(system(cmd));
/* The below is not reached but is here for completeness to remind
maintainers that this buffer is still allocated.. */
free(cmd);
} else if (pid > 0) {
/* parent */
waitpid(pid, NULL, 0);
} else {
/* error.. */
logg("!VirusAction: fork failed.\n");
}
}
int poll_fd(int fd, int timeout_sec)
{
int retval;
#ifdef HAVE_POLL
struct pollfd poll_data[1];
poll_data[0].fd = fd;
poll_data[0].events = POLLIN;
poll_data[0].revents = 0;
if (timeout_sec > 0) {
timeout_sec *= 1000;
}
while (1) {
retval = poll(poll_data, 1, timeout_sec);
if (retval == -1) {
if (errno == EINTR) {
continue;
}
return -1;
}
return retval;
}
#else
fd_set rfds;
struct timeval tv;
if (fd >= DEFAULT_FD_SETSIZE) {
return -1;
}
while (1) {
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = timeout_sec;
tv.tv_usec = 0;
retval = select(fd+1, &rfds, NULL, NULL,
(timeout_sec>0 ? &tv : NULL));
if (retval == -1) {
if (errno == EINTR) {
continue;
}
return -1;
}
return retval;
}
#endif
return -1;
}
int is_fd_connected(int fd)
{
#ifdef HAVE_POLL
struct pollfd poll_data[1];
int count;
poll_data[0].fd = fd;
poll_data[0].events = POLLIN;
poll_data[0].revents = 0;
if ((count=poll(poll_data, 1, 0)) == -1) {
if (errno == EINTR) {
return 1;
}
return 0;
}
if (count == 0) {
return 1;
}
if (poll_data[0].revents & POLLHUP) {
return 0;
}
if ((poll_data[0].revents & POLLIN) && (ioctl(fd, FIONREAD, &count) == 0)) {
if (count == 0) {
return 0;
}
}
return 1;
#else
fd_set rfds;
struct timeval tv;
char buff[1];
if (fd >= DEFAULT_FD_SETSIZE) {
return 1;
}
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
if (select(fd+1, &rfds, NULL, NULL, &tv) <= 0) {
return 1;
}
if (FD_ISSET(fd, &rfds)) {
if (recv(fd, buff, 1, MSG_PEEK) != 1) {
return 0;
}
}
return 1;
#endif
}
/* Function: writen
Try hard to write the specified number of bytes
*/
int writen(int fd, void *buff, unsigned int count)
{
int retval;
unsigned int todo;
unsigned char *current;
todo = count;
current = (unsigned char *) buff;
do {
retval = write(fd, current, todo);
if (retval < 0) {
if (errno == EINTR) {
continue;
}
return -1;
}
todo -= retval;
current += retval;
} while (todo > 0);
return count;
}
/* Submitted by Richard Lyons <frob-clamav*webcentral.com.au> */
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) && !defined(C_CYGWIN) && !defined(C_OS2) && !defined(INCOMPLETE_CMSG)
int readsock(int sockfd, char *buf, size_t size)
{
int fd;
ssize_t n;
struct msghdr msg;
struct iovec iov[1];
#ifdef HAVE_CONTROL_IN_MSGHDR
#ifndef CMSG_SPACE
#define CMSG_SPACE(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) + _CMSG_ALIGN(len))
#endif
#ifndef CMSG_LEN
#define CMSG_LEN(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
#endif
struct cmsghdr *cmsg;
char tmp[CMSG_SPACE(sizeof(fd))];
#endif
iov[0].iov_base = buf;
iov[0].iov_len = size;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = iov;
msg.msg_iovlen = 1;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
msg.msg_accrights = (caddr_t)&fd;
msg.msg_accrightslen = sizeof(fd);
#endif
#ifdef HAVE_CONTROL_IN_MSGHDR
msg.msg_control = tmp;
msg.msg_controllen = sizeof(tmp);
#endif
fd = -1;
if ((n = recvmsg(sockfd, &msg, 0)) <= 0)
return n;
errno = EBADF;
if (n != 1 || buf[0] != 0)
return !strncmp(buf, CMD12, strlen(CMD12)) ? -1 : n;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
if (msg.msg_accrightslen != sizeof(fd))
return -1;
#endif
#ifdef HAVE_CONTROL_IN_MSGHDR
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL)
return -1;
if (cmsg->cmsg_type != SCM_RIGHTS)
return -1;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(fd)))
return -1;
fd = *(int *)CMSG_DATA(cmsg);
#endif
if (fd < 0)
return -1;
n = snprintf(buf, size, "FD %d", fd);
if (n >= size)
return -1;
return n;
}
#endif