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120 lines
2.7 KiB
120 lines
2.7 KiB
/*
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* mangler module
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*
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* Copyright (C) 2001-2003 FhG Fokus
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* Kamailio 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, MA 02110-1301 USA
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*
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*/
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/*!
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* \file
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* \brief SIP-utils :: Mangler
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* \ingroup siputils
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* - Module; \ref siputils
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*/
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#include "utils.h"
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#include "../../parser/msg_parser.h" /* struct sip_msg */
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#include "../../mem/mem.h"
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#include "../../data_lump.h"
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#include <stdio.h>
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int
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patch (struct sip_msg *msg, char *oldstr, unsigned int oldlen, char *newstr,
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unsigned int newlen)
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{
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int off;
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struct lump *anchor;
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if (oldstr == NULL)
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return -1;
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if (newstr == NULL)
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return -2;
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off = oldstr - msg->buf;
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if (off < 0)
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return -3;
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if ((anchor = del_lump (msg, off, oldlen, 0)) == 0)
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{
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LM_ERR("lumping with del_lump\n");
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return -4;
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}
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if ((insert_new_lump_after (anchor, newstr, newlen, 0)) == 0)
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{
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LM_ERR("lumping with insert_new_lump_after\n");
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return -5;
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}
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return 0;
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}
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/* TESTED */
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int
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patch_content_length (struct sip_msg *msg, unsigned int newValue)
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{
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struct hdr_field *contentLength;
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char *s, pos[11];
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int len;
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contentLength = msg->content_length;
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if (contentLength == NULL) /* maybe not yet parsed */
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{
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if (parse_headers (msg, HDR_CONTENTLENGTH_F, 0) == -1)
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{
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LM_ERR("parse headers on Content-Length failed\n");
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return -1;
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}
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contentLength = msg->content_length;
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if (contentLength == NULL)
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{
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LM_ERR("failed to parse headers on Content-Length "
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"succeeded but msg->content_length is still NULL\n");
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return -2;
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}
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}
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/* perhaps dangerous because buffer is static ? */
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//pos = int2str(newValue,&len);
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len = snprintf ((char *) pos, 10, "%u", newValue);
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s = pkg_malloc (len);
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if (s == NULL)
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{
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LM_ERR("unable to allocate %d bytes in pkg mem\n", len);
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return -3;
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}
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memcpy (s, pos, len);
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/* perhaps we made it and no one called int2str,might use sprintf */
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if (patch(msg, contentLength->body.s, contentLength->body.len, s, len)<0)
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{
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pkg_free (s);
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LM_ERR("lumping failed\n");
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return -4;
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}
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LM_DBG ("succeeded in altering Content-Length to new value %u\n",newValue);
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return 0;
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}
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