1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* $Id: mf_funcs.c,v 1.4 2005/11/03 16:27:21 bogdan_iancu Exp $
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser 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
*
* openser 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
*
* History:
* ----------
* 2003-02-28 scratchpad compatibility abandoned (jiri)
* 2002-01-28 scratchpad removed (jiri)
* 2004-08-15 max value of max-fwd header is configurable (bogdan)
* 2005-11-03 MF value saved in msg->maxforwards->parsed (bogdan)
*/
#include <stdlib.h>
#include <string.h>
#include "mf_funcs.h"
#include "../../mem/mem.h"
#include "../../ut.h"
#include "../../data_lump.h"
#define MF_HDR "Max-Forwards: "
#define MF_HDR_LEN (sizeof(MF_HDR) - 1)
/* do a tricky thing and keep the parsed value of MAXFWD hdr incremented
* by one in order to make difference between 0 (not set)
* and 0 (zero value) - bogdan */
#define IS_MAXWD_STORED(_msg_) \
((_msg_)->maxforwards->parsed)
#define STORE_MAXWD_VAL(_msg_,_val_) \
(_msg_)->maxforwards->parsed = ((void*)(long)(_val_)+1)
#define FETCH_MAXWD_VAL(_msg_) \
(((int)(long)(_msg_)->maxforwards->parsed)-1)
/* looks for the MAX FORWARDS header
returns the its value, -1 if is not present or -2 for error */
int is_maxfwd_present( struct sip_msg* msg , str *foo)
{
int x, err;
/* lookup into the message for MAX FORWARDS header*/
if ( !msg->maxforwards ) {
if ( parse_headers( msg , HDR_MAXFORWARDS_F, 0 )==-1 ){
LOG( L_ERR , "ERROR:maxfwd:is_maxfwd_present :"
" parsing MAX_FORWARD header failed!\n");
return -2;
}
if (!msg->maxforwards) {
DBG("DEBUG: is_maxfwd_present: max_forwards header not found!\n");
return -1;
}
} else if (IS_MAXWD_STORED(msg)) {
return FETCH_MAXWD_VAL(msg);
}
/* if header is present, trim to get only the string containing numbers */
trim_len( foo->len , foo->s , msg->maxforwards->body );
/* convert from string to number */
x = str2s( foo->s,foo->len,&err);
if (err){
LOG(L_ERR, "ERROR:maxfwd:is_maxfwd_present:"
" unable to parse the max forwards number !\n");
return -2;
}
/* store the parsed values */
STORE_MAXWD_VAL(msg, x);
DBG("DEBUG:maxfwd:is_maxfwd_present: value = %d \n",x);
return x;
}
int decrement_maxfwd( struct sip_msg* msg , int x, str *s)
{
int i;
/*rewriting the max-fwd value in the message (buf and orig)*/
x--;
for(i = s->len - 1; i >= 0; i--) {
s->s[i] = (x % 10) + '0';
x /= 10;
if (x==0) {
i = i - 1;
break;
}
}
while(i >= 0) s->s[i--] = ' ';
/* update the stored value */
STORE_MAXWD_VAL(msg, x);
return 0;
}
int add_maxfwd_header( struct sip_msg* msg , unsigned int val )
{
unsigned int len;
char *buf;
struct lump* anchor;
/* constructing the header */
len = MF_HDR_LEN /*"MAX-FORWARDS: "*/+ CRLF_LEN + 3/*val max on 3 digits*/;
buf = (char*)pkg_malloc( len );
if (!buf) {
LOG(L_ERR, "ERROR:maxfwd:add_maxfwd_header: no more pkg memory\n");
goto error;
}
memcpy( buf , MF_HDR, MF_HDR_LEN );
len = MF_HDR_LEN ;
len += btostr( buf+len , val );
memcpy( buf+len , CRLF , CRLF_LEN );
len +=CRLF_LEN;
/*inserts the header at the beginning of the message*/
anchor = anchor_lump(msg, msg->headers->name.s - msg->buf, 0 , 0);
if (anchor == 0) {
LOG(L_ERR, "ERROR:maxfwd:add_maxfwd_header: failed to get anchor\n");
goto error1;
}
if (insert_new_lump_before(anchor, buf, len, 0) == 0) {
LOG(L_ERR, "ERROR:maxfwd:add_maxfwd_header: failed to insert "
"MAX-FORWARDS lump\n");
goto error1;
}
return 0;
error1:
pkg_free( buf );
error:
return -1;
}
|
