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simscan.c
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simscan.c
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/*
* $Id: simscan.c,v 1.8 2009/12/13 04:45:39 xen0phage Exp $
* Copyright (C) 2004-2005 Inter7 Internet Technologies, Inc.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <time.h>
#include "config.h"
#include "cdb/cdb.h"
#ifdef ENABLE_REGEX
#include <pcre.h>
#endif
/* qmail-queue error codes */
#define EXIT_0 0 /* Success */
#define EXIT_11 11 /* address too long */
#define EXIT_454 54 /* unable to read message or envelope */
#define EXIT_400 71 /* temporary refusal to accept */
#define EXIT_500 31 /* permenent refusal to accept message SMTP: 5XX code */
#define EXIT_MSG 82 /* exit with custom error message */
#define EXIT_91 91 /* Envelope format error. */
/*
51 Out of memory.
52 Timeout.
53 Write error; e.g., disk full.
54 Unable to read the message or envelope.
55 Unable to read a configuration file. (Not used by qmail-queue.)
56 Problem making a network connection from this host. (Not used by
qmail-queue.)
61 Problem with the qmail home directory.
62 Problem with the queue directory.
63 Problem with queue/pid.
64 Problem with queue/mess.
65 Problem with queue/intd.
66 Problem with queue/todo.
71 Mail server temporarily refuses to send the message to any recipi-
ents. (Not used by qmail-queue.)
72 Connection to mail server timed out. (Not used by qmail-queue.)
73 Connection to mail server rejected. (Not used by qmail-queue.)
74 Connection to mail server succeeded, but communication failed.
81 Internal bug; e.g., segmentation fault.
91 Envelope format error.
*/
#if HAVE_STRSEP!=1
char *strsep (char **pp, char *delim);
#endif
#ifdef QUARANTINEDIR
void quarantine_msg(char *message_name);
#endif
#define MAX_DSPAM_ARGS 20
char *dspam_args[MAX_DSPAM_ARGS];
#define MAX_SPAMC_ARGS 20
char *spamc_args[MAX_SPAMC_ARGS];
/* Global work buffers */
#define BUFFER_SIZE 2048
char buffer[BUFFER_SIZE];
char message_name[BUFFER_SIZE+10];
char workdir[BUFFER_SIZE];
char unique_ext[BUFFER_SIZE];
void format_dir(char *workdir);
void exit_clean(int error_code);
int fd_move(int to,int from);
int fd_copy(int to,int from);
int remove_files(char *dir);
int str_rstr(register char *h,register char *n);
char *replace(char *string, char *oldpiece, char *newpiece);
int DebugFlag = 0;
int DebugFiles = 0;
/* --stdout is required for reading virus names */
char *viri_args[] = { "clamdscan", "--stdout", message_name, NULL };
/* To/From address processing globals */
#define MAX_RCPT_TO 255
#define MAX_EMAIL 500
char addr_name[BUFFER_SIZE+5];
char *addr_buff;
int MaxRcptTo;
char MailFrom[MAX_EMAIL];
char Subject[BUFFER_SIZE];
char RcptTo[MAX_RCPT_TO][MAX_EMAIL];
int PerDomainHits = 0;
float PDHits;
int cdb_seek(int fd, char *key, unsigned int len, uint32 *dlen);
char *qmail_queue = QMAILQUEUE;
void lowerit(char *input);
/* Per Domain globals */
#ifdef ENABLE_PER_DOMAIN
#define MAXDOMAINS 100
#define MAXDOMLEN 256
#define PER_DOMAIN_TOKENS " =\t\n\r,\"'"
#define MAIL_EXT_TOKENS "-"
int PerDomainClam;
int PerDomainSpam;
int PerDomainTrophie;
int PerDomainSpamPassthru;
int MaxDomains;
char Domains[MAXDOMAINS][MAXDOMLEN];
void set_per_domain();
void init_per_domain();
void per_domain_lookup( char *key );
void per_domain_email_lookup (char *email);
#endif
/* Customer Smtp reject message globals */
#ifdef ENABLE_CUSTOM_SMTP_REJECT
char RejectMsg[BUFFER_SIZE+100];
#endif
/* Generic virus scanner globals */
#ifdef VIRUSSCANNER
char VirusName[BUFFER_SIZE];
int FoundVirus=0;
#endif
/* attachment and virusscanner need ripmime */
#if (VIRUSSCANNER==1 || ENABLE_ATTACH==1) && DO_RIPMIME==1
int run_ripmime();
#endif
/* Trophie virus scanner globals */
#ifdef ENABLE_TROPHIE
int check_trophie();
#endif
/* ClamAntiVirus globals */
#ifdef ENABLE_CLAMAV
int InClamHeaders;
int check_clam();
int is_clam(char *clambuf);
void log_clam(char *clambuf);
#endif
/* Attachment scanning globals */
#ifdef ENABLE_ATTACH
#define ATTACH_TOKENS " :\t\n\r"
#define MAX_ATTACH 100
#define MAX_ATTACH_LINE 100
char AttachName[256];
char bk_attachments[MAX_ATTACH][MAX_ATTACH_LINE];
int MaxAttach=0;
int check_attach();
int init_attach();
#endif
float SpamProbability=0.0;
float DSpamConf=0.0;
/* DSPAM scanning globals */
#if defined(ENABLE_DSPAM)
int InHeaders;
int IsSpam;
char spam_message_name[BUFFER_SIZE+10];
int check_dspam();
int is_dspam(char *spambuf);
#endif
float SpamHits;
float SAReqHits;
/* Spam scanning globals */
#ifdef ENABLE_SPAM
char spamuser[BUFFER_SIZE];
int InHeaders;
int IsSpam;
char spam_message_name[BUFFER_SIZE+10];
int check_spam();
int is_spam(char *spambuf);
#endif
struct timeval start,stop;
double utime;
#define SECS(tv) (tv.tv_sec + tv.tv_usec / 1000000.0)
/* write a received line */
#ifdef ENABLE_RECEIVED
char runned_scanners[MAX_EMAIL]="";
void add_run_scanner(char *key);
struct tm *tm;
static char monthname[12][4] = {
"Jan","Feb","Mar","Apr","May","Jun"
,"Jul","Aug","Sep","Oct","Nov","Dec"};
#endif
#ifdef ENABLE_REGEX
#define MAX_REGEX 100
#define MAX_REGEX_LINE 500
int numRegex=0;
char regexs[MAX_REGEX][MAX_REGEX_LINE];
pcre *comp_regexs[MAX_REGEX];
int check_regex();
void init_regex(char *);
#endif
void log_message( char *state, char *subject, int spam );
int main(int argc, char **argv)
{
#ifdef HAS_ULIMIT_NPROC
struct rlimit limits;
#endif
static int fd;
int ret;
int fd_per;
size_t tmpread;
size_t msgsize;
char *tmpstr;
int pim[2];
int qstat;
int pid;
int i = 0;
int gotrcpt = 0;
int gotfrom = 0;
/* attachments-size-limit patch */
char ch, simsizelimit_file[300], buf[32];
FILE *simsizelimit;
int size_limit=250000, buflen=0, ibuf;
/* end attachments-size-limit patch */
/* print out version information if requested */
if ( argc > 1 && strcmp(argv[1],"-v" )==0 ) {
printf("simscan version: %s\n", VERSION);
exit(0);
}
#ifdef HAS_ULIMIT_NPROC
/* Set ulimits to prevent hangs if it forks too many processes */
getrlimit(RLIMIT_NPROC, &limits);
limits.rlim_cur = 1024;
setrlimit(RLIMIT_NPROC, &limits);
#endif
/* get the starttime of the process */
gettimeofday(&start,(struct timezone *) 0);
/* Set the debug flag if environment variable set */
if ( (tmpstr=getenv("SIMSCAN_DEBUG"))!=NULL ) {
DebugFlag = atoi(tmpstr);
}
/* Set the "leave temp files alone" flag */
if ( (tmpstr=getenv("SIMSCAN_DEBUG_FILES"))!=NULL ) {
DebugFiles = atoi(tmpstr);
}
#ifdef ENABLE_ATTACH
init_attach();
#endif
#ifdef ENABLE_PER_DOMAIN
init_per_domain();
#endif
/* format the new directory name */
format_dir(workdir);
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: starting: work dir: %s\n", getppid(), workdir);
}
/* create the working directory, allow group access too */
umask(027);
if ( mkdir(workdir, 0750) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error making work dir, exit 400, errno: %d\n",
getppid(), errno);
}
_exit(EXIT_400);
}
/* change to the new working directory */
if ( chdir(workdir) != 0 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error changing directory to workdir errno: %d\n",
getppid(), errno);
}
exit_clean(EXIT_400);
}
/* open a msg file to hold the email */
snprintf(message_name, sizeof(message_name), "msg.%s", unique_ext);
if ( (fd=open(message_name, O_WRONLY|O_CREAT|O_TRUNC,0644)) ==- 1) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error opening msg file %s errnostr: %d\n",
getppid(), message_name, errno);
}
exit_clean(EXIT_400);
}
/* read the email into the new file */
msgsize = 0;
while( (ret = read(0, buffer, sizeof(buffer))) > 0 ) {
msgsize += ret;
if ( write(fd, buffer,ret) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error writing msg error: %d\n", getppid(), errno);
}
/* on a write error close the file so we can remove the directory */
close(fd);
exit_clean(EXIT_400);
}
}
/* close the file */
if ( close(fd) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error closing email file errno: %d\n", getppid(), errno);
}
exit_clean(EXIT_400);
}
/* if we had a read error, exit with deferral message */
if ( ret < 0 ) exit_clean(EXIT_400);
/* open a msg file to hold the email addrs */
snprintf(addr_name, sizeof(addr_name), "addr.%s", unique_ext);
/* open the addr_name file */
if ( (fd_per=open(addr_name, O_WRONLY|O_CREAT|O_TRUNC,0644)) ==- 1) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error opening addr name: %s\n", getppid(), addr_name);
}
exit_clean(EXIT_400);
}
/* read/write in the email addresses */
addr_buff = calloc(sizeof(char),MAX_EMAIL);
if ( addr_buff == NULL ) exit_clean(EXIT_400);
MaxRcptTo = 0;
memset(RcptTo,0,sizeof(RcptTo));
memset(MailFrom,0,sizeof(MailFrom));
errno = 0;
while( (tmpread=read(1,addr_buff+i,1))>0 ) {
write(fd_per,addr_buff+i, 1);
if (addr_buff[i++]!=0 && i<MAX_EMAIL)
continue;
/* one line received */
i=0;
if (addr_buff[0] == '\0') {
// \0\0 is end of envelop list
if (!gotrcpt) {
// end of list without Recipient? Hm.. seems error
free (addr_buff);
close (fd_per);
exit_clean(EXIT_91);
}
break;
}
if (addr_buff[0] == 'F') {
if (gotfrom) {
// only one MAIL FROM can be
free (addr_buff);
close (fd_per);
exit_clean(EXIT_91);
}
strncpy(MailFrom, &addr_buff[1], sizeof(MailFrom)-1);
lowerit(MailFrom);
gotfrom = 1;
if ( DebugFlag > 3 )
fprintf(stderr, "simscan:[%d]: F envelope is %s\n", getppid(), MailFrom);
}
if (addr_buff[0] == 'T') {
if (MaxRcptTo<MAX_RCPT_TO) {
strncpy(RcptTo[MaxRcptTo], &addr_buff[1], MAX_EMAIL-1);
lowerit(RcptTo[MaxRcptTo]);
gotrcpt = 1;
MaxRcptTo ++;
if ( DebugFlag > 3 )
fprintf(stderr, "simscan:[%d]: T%d envelope is %s\n", getppid(), MaxRcptTo, RcptTo[MaxRcptTo-1]);
}
}
}
free (addr_buff);
if (tmpread <= 0 && errno != 0) {
// error or unexpected EOF
close (fd_per);
exit_clean(EXIT_454);
}
if ( MailFrom[0] == 0 && RcptTo[0][0] == 0 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: no envelope information, deferred exit\n", getppid());
}
exit_clean(EXIT_454);
}
/* close the addr file */
if ( close(fd_per) == -1 ) {
exit_clean(EXIT_400);
}
#if defined(ENABLE_DSPAM)
if (getenv("RELAYCLIENT")==0) {
for (i =0; i<MaxRcptTo; ++i){
if ( strncmp("spam@", RcptTo[i], 5) == 0 || strncmp("nospam@", RcptTo[i], 7) == 0 ) {
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg),
"DYou are not authorized to send email to this address");
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
}
}
}
#endif
#ifdef ENABLE_PER_DOMAIN
/* setup the per domain values for checking virus or spam */
set_per_domain();
#endif
#ifdef ENABLE_REGEX
/* check for regexs to block */
if ( check_regex() == 2 ) {
log_message("REGEX", VirusName, 0);
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg),
"DYour email was rejected because it matches a filter (%s)",
VirusName );
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
}
#endif
#if defined(ENABLE_DSPAM)
/* The following code is copied from the Spamassassin check below, with the proper adjustments */
/* re-open the file read only */
if ( (fd = open(message_name, O_RDONLY)) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: spam can not open file: %s\n", getppid(), message_name);
}
exit_clean(EXIT_400);
}
/* set the standard input to be the new file */
if ( fd_move(0,fd) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: spam could not fd_move\n", getppid());
}
exit_clean(EXIT_400);
}
/* optionally check for spam with DSPAM */
snprintf(spam_message_name, sizeof(spam_message_name), "spamc.msg.%s", unique_ext);
IsSpam = 0;
ret = check_dspam();
switch ( ret ) {
/* spamassassin not enabled for this domain */
case 2:
/* re-open the message file file read only */
/* do nothing, message_name gets openend in any case*/
break;
/* spam detected, refuse message */
case 1:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: DSPAM reported message as being SPAM\n", getppid());
}
close(fd);
#ifdef QUARANTINEDIR
quarantine_msg(spam_message_name);
/* put message in quarantine */
#endif
#ifdef ENABLE_DROPMSG
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: droping the message\n", getppid());
}
exit_clean(EXIT_0);
/* Drop the message, returning success to sender. */
#else
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg), "DYour email is considered spam (%.4f probability)", SpamProbability );
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
#endif
break;
/* dspam processed message and no spam detected */
case 0:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: DSPAM reported message as NOT being SPAM\n", getppid());
}
/* open the spam file read only */
strncpy(message_name,spam_message_name,BUFFER_SIZE);
break;
/* errors , return temporary error */
default:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: check_dspam had an error ret: %d\n", getppid(), ret);
}
close(fd);
exit_clean(EXIT_400);
}
#endif
#ifdef ENABLE_SPAM
/* attachments-size-limit patch */
// read control/simsizelimit file
snprintf(simsizelimit_file, sizeof(simsizelimit_file), "%s/simsizelimit", CONTROLDIR);
simsizelimit = fopen(simsizelimit_file, "r");
if( simsizelimit != NULL ) {
while(1) {
ch = fgetc(simsizelimit);
if(ch==EOF || ch==' ' || ch=='\n' || ch=='\t' || ch=='\r') {
ibuf = atoi(buf);
// returns 0 if it's not an integer
if (ibuf > 0) size_limit = ibuf;
break;
}
else {
buf[buflen] = ch;
buflen++;
}
}
fclose(simsizelimit);
}
if ( DebugFlag > 0 ) fprintf(stderr, "simscan: size limit is %d bytes\n", size_limit);
if (msgsize >= size_limit) {
// if ( DebugFlag > 0 ) { // now logging also when debug is off
fprintf(stderr, "simscan: big file (%lu bytes); size limit is %d bytes; skipping SpamAssassin\n",
(unsigned long) msgsize, size_limit);
// }
/* end attachments-size-limit patch */
} else {
/* re-open the file read only */
if ( (fd = open(message_name, O_RDONLY)) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan: spam can not open file: %s\n", message_name);
}
exit_clean(EXIT_400);
}
/* set the standard input to be the new file */
if ( fd_move(0,fd) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan: spam could not fd_move\n");
}
exit_clean(EXIT_400);
}
/* optionally check for spam with spamassassin */
snprintf(spam_message_name, sizeof(spam_message_name), "spamc.msg.%s", unique_ext);
ret = check_spam();
switch ( ret ) {
/* spamassassin not enabled for this domain */
case 2:
/* re-open the message file file read only */
/* do nothing, message_name gets openend in any case*/
break;
/* spam detected, refuse message */
case 1:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan: check_spam detected spam refuse message\n");
}
close(fd);
#ifdef QUARANTINEDIR
quarantine_msg(message_name);
/* put message in quarantine */
#endif
#ifdef ENABLE_DROPMSG
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan: droping the message\n");
}
exit_clean(EXIT_0);
/* Drop the message, returning success to sender. */
#else
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg),
"DYour email is considered spam (%.2f spam-hits)", SpamHits );
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
#endif
break;
/* spamassassin processed message and no spam detected */
case 0:
/* open the spam file read only */
// strncpy(message_name,spam_message_name,BUFFER_SIZE);
memcpy(message_name,spam_message_name,BUFFER_SIZE);
break;
/* errors , return temporary error */
default:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan: check_spam had an error ret: %d\n", ret);
}
close(fd);
exit_clean(EXIT_400);
}
}
#endif
#if (VIRUSSCANNER==1 || ENABLE_ATTACH==1) && DO_RIPMIME==1
/* break the email msg into mime parts */
if ( run_ripmime() != 0 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: ripmime error\n", getppid());
}
exit_clean(EXIT_400);
}
#endif
#ifdef ENABLE_ATTACH
/* check for attachments to block */
if ( check_attach() > 0 ) {
log_message("ATTACH", AttachName, 0);
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg),
"DYour email was rejected because it contains a bad attachment: %s",
AttachName );
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
}
#endif
#ifdef ENABLE_CLAMAV
/* Run ClamAntiVirus, exit on errors */
if (FoundVirus == 0) {
ret = check_clam();
switch ( ret ) {
case -2:
if ( DebugFlag > 0 ) { fprintf(stderr, "simscan:[%d]: clamdscan disabled\n", getppid()); }
break;
case -1:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: fatal error executing clamdscan\n", getppid());
}
exit_clean(EXIT_400);
break;
case 1:
FoundVirus=1;
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: clamdscan detected a virus\n", getppid());
}
break;
case 2:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: fatal error executing clamdscan\n", getppid());
}
exit_clean(EXIT_400);
break;
default:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: normal clamdscan return code: %d\n", getppid(), ret);
}
break;
}
}
#endif
#ifdef ENABLE_TROPHIE
if (FoundVirus == 0) {
ret = check_trophie();
switch(ret) {
case 0:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: trophie found no virus\n", getppid());
}
break;
case 1:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: trophie found virus\n", getppid());
}
FoundVirus=1;
break;
case -1:
/* disabled */
if ( DebugFlag > 0 ) { fprintf(stderr, "simscan:[%d]: trophie disabled\n", getppid()); }
break;
default:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: some temp. error occured with trophie\n", getppid());
}
exit_clean(EXIT_400);
}
}
#endif
#ifdef VIRUSSCANNER
/* check for viri, return error if found or a temporary problem */
if ( FoundVirus == 1 ) {
#ifdef ENABLE_DROPMSG
log_message("VIRUS DROPPED", VirusName, 0);
/* Drop the message, returning success to sender. */
exit_clean(EXIT_0);
#else
log_message("VIRUS", VirusName, 0);
#ifdef ENABLE_CUSTOM_SMTP_REJECT
snprintf(RejectMsg,sizeof(RejectMsg),
"DYour email was rejected because it contains the %s virus",
VirusName );
write(4,RejectMsg, strlen(RejectMsg));
exit_clean(EXIT_MSG);
#else
exit_clean(EXIT_500);
#endif
#endif
}
#endif
/* re-open the file read only */
if ( (fd = open(message_name, O_RDONLY)) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: could not re-open file: %s\n", getppid(), message_name);
}
exit_clean(EXIT_400);
}
/* re-open the address read only */
if ( (fd_per = open(addr_name, O_RDONLY)) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: could not re-open address: %s\n", getppid(), addr_name);
}
exit_clean(EXIT_400);
}
/* set the standard input to be the new file */
if ( fd_move(1,fd_per) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: could not fd_move\n", getppid());
}
exit_clean(EXIT_400);
}
if ( DebugFlag > 0 ) fprintf(stderr, "simscan:[%d]: done, execing qmail-queue\n", getppid());
if ( pipe(pim) != 0 ) return(-1);
/* fork qmail-queue */
switch(pid = vfork()) {
case -1:
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error forking qmail-queue\n", getppid());
}
close(pim[0]);
close(pim[1]);
exit_clean(EXIT_400);
case 0:
close(pim[1]);
dup2(pim[0],0);
execl(qmail_queue, qmail_queue, (char *)NULL);
_exit(111);
}
close(pim[0]);
#ifdef ENABLE_RECEIVED
gettimeofday(&stop,(struct timezone *) 0);
utime=SECS(stop)-SECS(start);
tm = gmtime(&start.tv_sec);
snprintf(buffer,sizeof(buffer), "Received: (simscan %s ppid %d pid %d t %.4fs)\n"
" (scanners: %s); %02d %s %04d %02d:%02d:%02d -0000\n",
VERSION, getppid(), getpid(), utime, runned_scanners[0] ? runned_scanners : "none",
tm->tm_mday,monthname[tm->tm_mon],tm->tm_year,tm->tm_hour,tm->tm_min,tm->tm_sec);
if ( write(pim[1], buffer,strlen(buffer)) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error writing received line\n", getppid());
}
exit_clean(EXIT_400);
}
#endif
/* write the message to qmail-queue */
while( (ret = read(fd, buffer, sizeof(buffer))) > 0 ) {
if ( write(pim[1], buffer,ret) == -1 ) {
if ( DebugFlag > 0 ) {
fprintf(stderr,
"simscan:[%d]: error writing msg to qmail-queue error: %d\n", getppid(), errno);
}
exit_clean(EXIT_400);
}
}
close(pim[1]);
close(fd);
/* wait for qmail-queue to finish */
if (waitpid(pid,&qstat, 0) == -1) {
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: error forking qmail-queue (back in simscan)\n", getppid());
}
exit_clean(EXIT_400);
}
/* hand the email to the qmail-queue */
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: qmail-queue exited %d\n", getppid(), WEXITSTATUS(qstat));
}
/* remove the working files */
if ( DebugFiles < 2 ) {
if ( remove_files(workdir) == -1 ) {
exit_clean(EXIT_400);
}
}
/* pass qmail-queue's exit status on */
_exit(WEXITSTATUS(qstat));
/* suppress warning messages */
return(0);
}
void lowerit(char *input)
{
while(*input!=0) {
if ( isupper((u_char)*input) ) {
*input = (u_char)tolower((u_char)*input);
}
++input;
}
}
/*
* move a file descriptor
*/
int fd_move(int to,int from)
{
if (to == from) return 0;
if (fd_copy(to,from) == -1) return -1;
close(from);
return 0;
}
/*
* copy a file descriptor
*/
int fd_copy(int to,int from)
{
if (to == from) return 0;
if (fcntl(from,F_GETFL,0) == -1) return -1;
close(to);
if (fcntl(from,F_DUPFD,to) == -1) return -1;
return 0;
}
#ifdef ENABLE_RECEIVED
void add_run_scanner(char *key){
int ret;
int fd;
uint32 dlen;
unsigned int keylen;
char tmpbuf[256];
char *data;
if ( DebugFlag > 1 ) fprintf(stderr, "simscan:[%d]: cdb looking up version %s\n", getppid(), key);
snprintf(tmpbuf,sizeof(tmpbuf), "%s/simversions.cdb", CONTROLDIR);
if ( (fd = open(tmpbuf, O_RDONLY)) == -1 ) {
return;
}
keylen = strlen(key);
ret = cdb_seek(fd,key,keylen,&dlen);
if ( ret <= 0 ) {
close(fd);
return;
}
data = calloc(sizeof(char),dlen+1);
if ( data == NULL ) exit_clean(EXIT_400);
ret = read(fd,data,dlen);
close(fd);
snprintf(runned_scanners+strlen(runned_scanners),MAX_EMAIL-strlen(runned_scanners)," %s: %s",key,data);
if ( DebugFlag > 2 ) fprintf(stderr, "simscan:[%d]: runned_scanners is %s\n", getppid(), runned_scanners);
if ( DebugFlag > 2 ) fprintf(stderr, "simscan:[%d]: found %s\n", getppid(), data);
}
#endif
#if (VIRUSSCANNER || ENABLE_ATTACH) && DO_RIPMIME==1
/*
* break the email into mime parts for scanning
*/
int run_ripmime()
{
int pid;
int rmstat;
/* fork ripmime */
switch(pid = vfork()) {
case -1:
return(-1);
case 0:
close(1);
close(2);
execl(RIPMIME, "ripmime", "--disable-qmail-bounce",
"-i", message_name, "-d", workdir, NULL );
_exit(-1);
}
/* wait for ripmime to finish */
if (waitpid(pid,&rmstat, 0) == -1) {
return(-1);
}
/* check if the child died on a signal */
if ( WIFSIGNALED(rmstat) ) return(-1);
/* if it exited okay, return the status */
if ( WIFEXITED(rmstat) ) {
return(WEXITSTATUS(rmstat));
}
/* should not reach here */
return(-1);
}
#endif
/*
* scan for viri
*/
#ifdef ENABLE_CLAMAV
int check_clam()
{
int pid;
int rmstat;
int pim[2];
int file_count;
#ifdef ENABLE_PER_DOMAIN
if ( PerDomainClam == 0 ) return(-2);
#endif
if ( DebugFlag > 0 ) {
fprintf(stderr, "simscan:[%d]: calling clamdscan\n", getppid());
}