[Serusers] adding a header

Mario Kolberg mko at cs.stir.ac.uk
Mon Jul 7 14:08:01 CEST 2003


I'm trying to add a header to SIP messages (for a research project). 
However, it seems as ser (version 0.8.11pre26) doesn't like my code. 
Below is the function which is part of a module. It seems as depending 
on the length of the variable test, ser either crashes or just doesn't 
send on the full message (truncated after the new header). It sounds a 
bit like a memory problem. I tried to make sure that memory is properly 
allocated (thats why the pkg_malloc) and the string is terminated.

I'd be grateful for any pointers!



static int exec_pol(struct sip_msg* msg, char* string, char* string2)

   struct lump* anchor;
   char* nheader;
   char test[] = "ConType: ABC";

LOG(L_ERR, "PSCON: New Attempt to Add a Header");

   if (parse_headers(msg, HDR_EOH, 0) == -1) {
     LOG(L_ERR, "Error parsing headers");
     return 1;

   if(msg->first_line.type == SIP_REQUEST) {
     anchor = anchor_lump(&msg->add_rm, msg->eoh - msg->buf, 0, 0);
     if (anchor == 0) {
       LOG(L_ERR, "Problem with getting anchor");
       return 1;

     nheader = pkg_malloc(strlen(test)+1);
     strcpy(nheader, test);

     if (insert_new_lump_after(anchor, nheader, strlen(nheader)+1, 0)==0) {
       LOG(L_ERR, "ERROR: inserting new header");

   LOG(L_ERR, "pscon: all fine, returning now ...\n");
   return 1;

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