"Command died with signal 10" using pipe and a C script

[Jordi Moles Blanco]

hi,

and thanks in advance for your help.
I'm using a home-made script called "quota_postfix" through the "pipe" 
feature of postfix.

here's how i call the C script from postfix:

master.cf:

********************************

................

# spamfilter
spamfilter      unix    -       n       n       -       20      pipe
flags=R user=filter argv=/home/cgi-bin/antispam.pl "localhost:10027" 
"antispam" "${sender}" "${recipient}" "/usr/local/bin/spamc"

# from spamfilter to smtpd:10026
localhost:10027 inet    n       -       n       -       100       smtpd 
-o content_filter=quota_postfix

# quota_postfix
quota_postfix      unix    -       n       n       -       20      pipe
flags=R user=filter argv=/usr/local/etc/postfix/quota_postfix 
"localhost" "10028" "${sender}" "${recipient}" "${domain}"

# from quota_postfix to smtpd:10028
localhost:10028 inet    n       -       n       -       100       smtpd 
-o content_filter=

..............................

*******************


The issue in this set-up is that sometimes, let's say, just 1 of every 
200 or 300 messages gets bounced. If you have a look at the postfix's 
logs, you'll see this:


************************
Aug  8 10:28:11 mail01 postfix/pipe[78884]: E0402143719: 
to=<[EMAIL PROTECTED], relay=quota_postfix, delay=0.21, delays=0.1/0/0/0.1, 
dsn=5.3.0, status=bounced (Command died with signal 10: 
"/usr/local/etc/postfix/quota_postfix")
************************

If right after that you try to send a new message to that mailbox, it 
will get delivered. It seems a really random crash to me.

Anyway...

I've tried to debug my C script for some days now, and ended up doing it 
"the hard way". I included some lines in the C script so that it keeps a 
log of each line of code it executes before crashing.
And my surprise was that in all the crashes, it gets to the very end of it.
If you have a look at the code that follows....

*********
fprintf(file,"\nDEBUG AA, id: %i",aleatori);

return 0;
***********

these two lines are the end of the file in all the crashes, and "DEBUG 
AA", "DEBUG 43" and also "DEBUG 44" are written on the file.

the communication with postfix is done by using the function 
"reinjecta_mail" i've also attached.

is there anything wrong that postfix can't understand and therefore 
crashes?

I was suggested that this "signal 10" could be a mistreatment of an 
array or a general core dump, but from the debugging i've realised that 
it gets to the end of it, so... there must be something about how i send 
the message back to postfix.

I'm using postfix 2.5 on a FreeBSD 7.0 server.



*******************

int reinjecta_mail(char *portnet,char *ipnet,char *remitent,char 
*victima,char *missatge,int aleatori)
{
       //Finalment, reinjectem el correu a la ip i port especificats en 
els parametres
               int sock;
               struct sockaddr_in server;
               struct hostent *hp;

       //fitxer on escriurem tots els problemes generats
           FILE *file;
           file = fopen("/var/log/quota-postfix.log","a+");
               //creem un socket
               if((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
               {
                       fprintf(file,"\n - error al crear socket per 
retornar el correu.");
                       fclose(file);
                       return 0;
               }
               //li donem un nom i unes propietats
               server.sin_family = AF_INET;
               server.sin_port = htons(atoi(portnet));
               server.sin_addr.s_addr = htonl (INADDR_ANY);
               bind (sock, (struct sockaddr *) &server, sizeof (server));
               //creem la conexio
               hp = gethostbyname(ipnet);
               bcopy ( hp->h_addr, &(server.sin_addr.s_addr), 
hp->h_length);
               if(connect(sock, (struct  sockaddr *)&server, 
sizeof(server)) != 0)
               {
                       fprintf(file,"\n - error al fer la conexio al 
postfix per retornar el correu. Port: %s IP: %s",portnet,ipnet);
                       fclose(file);
                       return 0;
               }
               //primer escribim el hola al servidor, segons el rfc de smtp
               char hola[100],resultat[100];
               strcpy(hola,"");
               strcpy(hola,"HELO localhost\r\n");
               write(sock,hola,strlen(hola));
               read(sock,resultat,100);
               strcpy(hola,"MAIL FROM:<");
               strcat(hola,remitent);
               strcat(hola,">\r\n");
               write(sock,hola,strlen(hola));
               strcpy(resultat,"");
               read(sock,resultat,100);
               strcpy(hola,"RCPT TO:<");
               strcat(hola,victima);
               strcat(hola,">\r\n");
               write(sock,hola,strlen(hola));
               strcpy(resultat,"");
               read(sock,resultat,100);
       strcpy(hola,"DATA\r\n");
               write(sock,hola,strlen(hola));
               strcpy(resultat,"");
               read(sock,resultat,100);
               //Finalment escribim el missatge a enviar
               write(sock,missatge,strlen(missatge));
               //i ara enviem una senyal de fi de missatge
               write(sock,"\r\n.\r\n",9);
               read(sock,resultat,100);
fprintf(file,"\nDEBUG 43, id: %i",aleatori);
               //tanquem la conexio
               close(sock);
fprintf(file,"\nDEBUG 44, id: %i",aleatori);
       return 0;
}

....................

int main(int argc,char *argv[],char *envp[])
{

..............

   if( espaiconsumit < espai) //si no sa passat de quota, finalment enviem
   {
       reinjecta_mail(portnet,ipnet,remitent,victima,missatge,aleatori);
fprintf(file,"\nDEBUG AA, id: %i",aleatori);   
       return 0;
   }
   else
   {
       ..............
   }

   return 0;

}



*******************



any idea how to fix this?

thanks.