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checks.c
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checks.c
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/*
* Various URI checks and Request URI manipulation
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* --------
* 2003-02-26: Created by janakj
* 2004-03-20: has_totag introduced (jiri)
* 2004-04-14: uri_param and add_uri_param introduced (jih)
*/
#include <string.h>
#include "../../str.h"
#include "../../dprint.h" /* Debugging */
#include "../../mem/mem.h"
#include "../../parser/digest/digest.h" /* get_authorized_cred */
#include "../../parser/parse_from.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_param.h"
#include "../../db/db.h" /* Database API */
#include "../../dset.h"
#include "../../pvar.h"
#include "checks.h"
/*
* Checks if From includes a To-tag -- good to identify
* if a request creates a new dialog
*/
int has_totag(struct sip_msg* _m, char* _foo, char* _bar)
{
str tag;
if (!_m->to && parse_headers(_m, HDR_TO_F,0)==-1) {
LM_ERR("To parsing failed\n");
return -1;
}
if (!_m->to) {
LM_ERR("no To\n");
return -1;
}
tag=get_to(_m)->tag_value;
if (tag.s==0 || tag.len==0) {
LM_DBG("no totag\n");
return -1;
}
LM_DBG("totag found\n");
return 1;
}
/*
* Check if the username matches the username in credentials
*/
int is_user(struct sip_msg* _m, char* _user, char* _str2)
{
str* s;
struct hdr_field* h;
auth_body_t* c;
s = (str*)_user;
get_authorized_cred(_m->authorization, &h);
if (!h) {
get_authorized_cred(_m->proxy_auth, &h);
if (!h) {
LM_ERR("no authorized credentials found (error in scripts)\n");
LM_ERR("Call {www,proxy}_authorize before calling is_user function !\n");
return -1;
}
}
c = (auth_body_t*)(h->parsed);
if (!c->digest.username.user.len) {
LM_DBG("username not found in credentials\n");
return -1;
}
if (s->len != c->digest.username.user.len) {
LM_DBG("username length does not match\n");
return -1;
}
if (!memcmp(s->s, c->digest.username.user.s, s->len)) {
LM_DBG("username matches\n");
return 1;
} else {
LM_DBG("username differs\n");
return -1;
}
}
/*
* Find if Request URI has a given parameter with no value
*/
int uri_param_1(struct sip_msg* _msg, char* _param, char* _str2)
{
return uri_param_2(_msg, _param, (char*)0);
}
/*
* Find if Request URI has a given parameter with matching value
*/
int uri_param_2(struct sip_msg* _msg, char* _param, char* _value)
{
str *param, *value, t;
param_hooks_t hooks;
param_t* params;
param = (str*)_param;
value = (str*)_value;
if (parse_sip_msg_uri(_msg) < 0) {
LM_ERR("ruri parsing failed\n");
return -1;
}
t = _msg->parsed_uri.params;
if (parse_params(&t, CLASS_ANY, &hooks, ¶ms) < 0) {
LM_ERR("ruri parameter parsing failed\n");
return -1;
}
while (params) {
if ((params->name.len == param->len) &&
(strncmp(params->name.s, param->s, param->len) == 0)) {
if (value) {
if ((value->len == params->body.len) &&
strncmp(value->s, params->body.s, value->len) == 0) {
goto ok;
} else {
goto nok;
}
} else {
if (params->body.len > 0) {
goto nok;
} else {
goto ok;
}
}
} else {
params = params->next;
}
}
nok:
free_params(params);
return -1;
ok:
free_params(params);
return 1;
}
/*
* Removes a given parameter from Request URI
*/
int del_uri_param(struct sip_msg* _msg, char* _param, char* _s)
{
str *param;
str params;
char *tok_end;
struct sip_uri *parsed_uri;
str param_tok, key;
str new_uri, old_uri;
int begin_len, end_len;
param = (str*)_param;
if (param->len == 0) {
return 1;
}
if (parse_sip_msg_uri(_msg) < 0) {
LM_ERR("ruri parsing failed\n");
return -1;
}
parsed_uri = &(_msg->parsed_uri);
params = parsed_uri->params;
if (0 == params.s || 0 == params.len) {
LM_WARN("RURI contains no params to delete! Returning...\n");
return 0;
}
while (params.len) {
tok_end = q_memchr(params.s, ';', params.len);
param_tok.s = params.s;
if (tok_end == NULL) {
param_tok.len = params.len;
params.len = 0;
} else {
param_tok.len = tok_end - params.s;
params.len -= (param_tok.len + 1/*';' char*/);
params.s += (param_tok.len + 1);
}
tok_end = q_memchr(param_tok.s, '=', param_tok.len);
if (tok_end == NULL) {
key = param_tok;
} else {
key.s = param_tok.s;
key.len = tok_end - param_tok.s;
}
if (!str_strcmp(param, &key)) {
/* found the param to remove */
old_uri = *GET_RURI(_msg);
new_uri.len = old_uri.len - param_tok.len;
new_uri.s = pkg_malloc(new_uri.len);
if (!new_uri.s) {
LM_ERR("no more pkg mem\n");
return -1;
}
begin_len = param_tok.s - old_uri.s - 1/*remove also the ';'
before the param */;
memcpy(new_uri.s, old_uri.s, begin_len);
end_len = old_uri.len - ((param_tok.s + param_tok.len) - old_uri.s);
if (end_len)
memcpy(new_uri.s + begin_len, param_tok.s + param_tok.len, end_len+1);
if (set_ruri(_msg, &new_uri) == 1) {
pkg_free(new_uri.s);
return 0;
} else {
pkg_free(new_uri.s);
return -1;
}
}
}
LM_DBG("requested key not found in RURI\n");
return 0;
}
/*
* Adds a new parameter to Request URI
*/
int add_uri_param(struct sip_msg* _msg, char* _param, char* _s2)
{
str *param, *cur_uri, new_uri;
struct sip_uri *parsed_uri;
char *at;
param = (str*)_param;
if (param->len == 0) {
return 1;
}
if (parse_sip_msg_uri(_msg) < 0) {
LM_ERR("ruri parsing failed\n");
return -1;
}
parsed_uri = &(_msg->parsed_uri);
/* if current ruri has no headers, pad param at the end */
if (parsed_uri->headers.len == 0) {
cur_uri = GET_RURI(_msg);
new_uri.len = cur_uri->len + param->len + 1;
if (new_uri.len > MAX_URI_SIZE) {
LM_ERR("new ruri too long\n");
return -1;
}
new_uri.s = pkg_malloc(new_uri.len);
if (new_uri.s == 0) {
LM_ERR("add_uri_param(): Memory allocation failure\n");
return -1;
}
memcpy(new_uri.s, cur_uri->s, cur_uri->len);
*(new_uri.s + cur_uri->len) = ';';
memcpy(new_uri.s + cur_uri->len + 1, param->s, param->len);
if (set_ruri(_msg, &new_uri ) == 1) {
goto ok;
} else {
goto nok;
}
}
/* otherwise take the long path */
new_uri.len = 4 +
(parsed_uri->user.len ? parsed_uri->user.len + 1 : 0) +
(parsed_uri->passwd.len ? parsed_uri->passwd.len + 1 : 0) +
parsed_uri->host.len +
(parsed_uri->port.len ? parsed_uri->port.len + 1 : 0) +
parsed_uri->params.len + param->len + 1 +
parsed_uri->headers.len + 1;
if (new_uri.len > MAX_URI_SIZE) {
LM_ERR("new ruri too long\n");
return -1;
}
new_uri.s = pkg_malloc(new_uri.len);
if (new_uri.s == 0) {
LM_ERR("no more pkg memory\n");
return -1;
}
at = new_uri.s;
memcpy(at, "sip:", 4);
at = at + 4;
if (parsed_uri->user.len) {
memcpy(at, parsed_uri->user.s, parsed_uri->user.len);
if (parsed_uri->passwd.len) {
*at = ':';
at = at + 1;
memcpy(at, parsed_uri->passwd.s, parsed_uri->passwd.len);
at = at + parsed_uri->passwd.len;
};
*at = '@';
at = at + 1;
}
memcpy(at, parsed_uri->host.s, parsed_uri->host.len);
at = at + parsed_uri->host.len;
if (parsed_uri->port.len) {
*at = ':';
at = at + 1;
memcpy(at, parsed_uri->port.s, parsed_uri->port.len);
at = at + parsed_uri->port.len;
}
memcpy(at, parsed_uri->params.s, parsed_uri->params.len);
at = at + parsed_uri->params.len;
*at = ';';
at = at + 1;
memcpy(at, param->s, param->len);
at = at + param->len;
*at = '?';
at = at + 1;
memcpy(at, parsed_uri->headers.s, parsed_uri->headers.len);
if (set_ruri(_msg, &new_uri) == 1) {
goto ok;
}
nok:
pkg_free(new_uri.s);
return -1;
ok:
pkg_free(new_uri.s);
return 1;
}
/*
* Converts Request-URI, if it is tel URI, to SIP URI. Returns 1, if
* conversion succeeded or if no conversion was needed, i.e., Request-URI
* was not tel URI. Returns -1, if conversion failed.
*/
int tel2sip(struct sip_msg* _msg, char* _s1, char* _s2)
{
str *ruri;
struct sip_uri *pfuri;
str suri;
char* at;
ruri = GET_RURI(_msg);
if (ruri->len < 4) return 1;
if (strncasecmp(ruri->s, "tel:", 4) != 0){
return 1;
}
if ((pfuri=parse_from_uri(_msg))==NULL) {
LM_ERR("parsing From header failed\n");
return -1;
}
suri.len = 4 + ruri->len - 4 + 1 + pfuri->host.len + 1 + 10;
suri.s = pkg_malloc(suri.len);
if (suri.s == 0) {
LM_ERR("no more pkg memory\n");
return -1;
}
at = suri.s;
memcpy(at, "sip:", 4);
at = at + 4;
memcpy(at, ruri->s + 4, ruri->len - 4);
at = at + ruri->len - 4;
*at = '@';
at = at + 1;
memcpy(at, pfuri->host.s, pfuri->host.len);
at = at + pfuri->host.len;
*at = ';';
at = at + 1;
memcpy(at, "user=phone", 10);
if (set_ruri(_msg, &suri) == 1) {
pkg_free(suri.s);
return 1;
} else {
pkg_free(suri.s);
return -1;
}
}
/*
* Check if parameter is an e164 number.
*/
static inline int e164_check(str* _user)
{
int i;
char c;
if ((_user->len > 2) && (_user->len < 17) && ((_user->s)[0] == '+')) {
for (i = 1; i <= _user->len; i++) {
c = (_user->s)[i];
if (c < '0' || c > '9') return -1;
}
return 1;
}
return -1;
}
/*
* Check if user part of URI in pseudo variable is an e164 number
*/
int is_uri_user_e164(struct sip_msg* _m, char* _sp, char* _s2)
{
pv_spec_t *sp;
pv_value_t pv_val;
struct sip_uri puri;
sp = (pv_spec_t *)_sp;
if (sp && (pv_get_spec_value(_m, sp, &pv_val) == 0)) {
if (pv_val.flags & PV_VAL_STR) {
if (pv_val.rs.len == 0 || pv_val.rs.s == NULL) {
LM_DBG("missing uri\n");
return -1;
}
if (parse_uri(pv_val.rs.s, pv_val.rs.len, &puri) < 0) {
LM_ERR("parsing URI failed\n");
return -1;
}
return e164_check(&(puri.user));
} else {
LM_ERR("pseudo variable value is not string\n");
return -1;
}
} else {
LM_ERR("failed to get pseudo variable value\n");
return -1;
}
}