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370 lines
6.8 KiB
370 lines
6.8 KiB
/*
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* $Id$
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*
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* Copyright (C) 2007 voice-system.ro
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*!
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* \file
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* \brief Generic string handling functions
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*/
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#include "../../ut.h"
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#include "strcommon.h"
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/*! \brief
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* add backslashes to special characters
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*/
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int escape_common(char *dst, char *src, int src_len)
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{
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int i, j;
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if(dst==0 || src==0 || src_len<=0)
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return 0;
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j = 0;
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for(i=0; i<src_len; i++)
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{
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switch(src[i])
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{
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case '\'':
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dst[j++] = '\\';
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dst[j++] = src[i];
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break;
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case '"':
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dst[j++] = '\\';
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dst[j++] = src[i];
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break;
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case '\\':
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dst[j++] = '\\';
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dst[j++] = src[i];
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break;
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case '\0':
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dst[j++] = '\\';
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dst[j++] = '0';
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break;
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default:
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dst[j++] = src[i];
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}
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}
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return j;
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}
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/*! \brief
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* remove backslashes to special characters
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*/
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int unescape_common(char *dst, char *src, int src_len)
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{
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int i, j;
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if(dst==0 || src==0 || src_len<=0)
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return 0;
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j = 0;
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i = 0;
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while(i<src_len)
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{
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if(src[i]=='\\' && i+1<src_len)
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{
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switch(src[i+1])
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{
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case '\'':
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dst[j++] = '\'';
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i++;
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break;
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case '"':
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dst[j++] = '"';
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i++;
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break;
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case '\\':
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dst[j++] = '\\';
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i++;
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break;
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case '0':
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dst[j++] = '\0';
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i++;
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break;
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default:
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dst[j++] = src[i];
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}
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} else {
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dst[j++] = src[i];
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}
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i++;
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}
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return j;
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}
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/*! \brief Compute MD5 checksum */
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void compute_md5(char *dst, char *src, int src_len)
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{
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MD5_CTX context;
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unsigned char digest[16];
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MD5Init (&context);
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MD5Update (&context, src, src_len);
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U_MD5Final (digest, &context);
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string2hex(digest, 16, dst);
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}
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/*! \brief Unscape all printable ASCII characters */
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int unescape_user(str *sin, str *sout)
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{
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char *at, *p, c;
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if(sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL
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|| sin->len<0 || sout->len < sin->len+1)
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return -1;
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at = sout->s;
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p = sin->s;
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while(p < sin->s+sin->len)
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{
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if (*p == '%')
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{
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p++;
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switch (*p)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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c = (*p - '0') << 4;
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break;
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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c = (*p - 'a' + 10) << 4;
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break;
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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c = (*p - 'A' + 10) << 4;
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break;
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default:
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LM_ERR("invalid hex digit <%u>\n", (unsigned int)*p);
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return -1;
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}
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p++;
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switch (*p)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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c = c + (*p - '0');
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break;
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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c = c + (*p - 'a' + 10);
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break;
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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c = c + (*p - 'A' + 10);
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break;
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default:
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LM_ERR("invalid hex digit <%u>\n", (unsigned int)*p);
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return -1;
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}
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if ((c < 32) || (c > 126))
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{
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LM_ERR("invalid escaped character <%u>\n", (unsigned int)c);
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return -1;
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}
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*at++ = c;
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} else {
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*at++ = *p;
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}
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p++;
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}
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*at = 0;
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sout->len = at - sout->s;
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LM_DBG("unescaped string is <%s>\n", sout->s);
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return 0;
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}
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/*! \brief
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* Escape all printable characters that are not valid in user
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* part of request uri
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* no_need_to_escape = unreserved | user-unreserved
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* unreserved = aplhanum | mark
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* mark = - | _ | . | ! | ~ | * | ' | ( | )
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* user-unreserved = & | = | + | $ | , | ; | ? | /
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*/
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int escape_user(str *sin, str *sout)
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{
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char *at, *p;
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unsigned char x;
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if(sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL
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|| sin->len<0 || sout->len < 3*sin->len+1)
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return -1;
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at = sout->s;
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p = sin->s;
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while (p < sin->s+sin->len)
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{
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if (*p < 32 || *p > 126)
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{
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LM_ERR("invalid escaped character <%u>\n", (unsigned int)*p);
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return -1;
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}
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if (isdigit((int)*p) || ((*p >= 'A') && (*p <= 'Z')) ||
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((*p >= 'a') && (*p <= 'z')))
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{
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*at = *p;
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} else {
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switch (*p) {
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case '-':
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case '_':
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case '.':
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case '!':
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case '~':
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case '*':
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case '\'':
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case '(':
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case ')':
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case '&':
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case '=':
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case '+':
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case '$':
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case ',':
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case ';':
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case '?':
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*at = *p;
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break;
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default:
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*at++ = '%';
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x = (*p) >> 4;
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if (x < 10)
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{
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*at++ = x + '0';
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} else {
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*at++ = x - 10 + 'a';
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}
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x = (*p) & 0x0f;
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if (x < 10) {
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*at = x + '0';
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} else {
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*at = x - 10 + 'a';
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}
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}
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}
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at++;
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p++;
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}
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*at = 0;
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sout->len = at - sout->s;
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LM_DBG("escaped string is <%s>\n", sout->s);
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return 0;
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}
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int unescape_param(str *sin, str *sout)
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{
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return unescape_user(sin, sout);
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}
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/*! \brief
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* Escape all printable characters that are not valid in
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* a param part of request uri: = | ; | , | | " | ? | &
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*/
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int escape_param(str *sin, str *sout)
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{
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char *at, *p;
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unsigned char x;
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if (sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL ||
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sin->len<0 || sout->len < 3*sin->len+1)
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return -1;
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at = sout->s;
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p = sin->s;
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while (p < sin->s+sin->len) {
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if (*p < 32 || *p > 126) {
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LM_ERR("invalid escaped character <%u>\n", (unsigned int)*p);
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return -1;
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}
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switch (*p) {
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case ' ':
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case '?':
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case '&':
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case '=':
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case ',':
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case ';':
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case '"':
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case '+':
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*at++ = '%';
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x = (*p) >> 4;
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if (x < 10)
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{
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*at++ = x + '0';
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} else {
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*at++ = x - 10 + 'a';
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}
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x = (*p) & 0x0f;
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if (x < 10) {
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*at = x + '0';
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} else {
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*at = x - 10 + 'a';
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}
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break;
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default:
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*at = *p;
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}
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at++;
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p++;
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}
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*at = 0;
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sout->len = at - sout->s;
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LM_DBG("escaped string is <%s>\n", sout->s);
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return 0;
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}
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