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reply.c
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reply.c
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/*
* Send a reply
*
* 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:
* --------
* 2003-01-18: buffer overflow patch committed (Jan on behalf of Maxim)
* 2003-01-21: Errors reported via Error-Info header field - janakj
* 2003-09-11: updated to new build_lump_rpl() interface (bogdan)
* 2003-11-11: build_lump_rpl() removed, add_lump_rpl() has flags (bogdan)
*/
/*!
* \file
* \brief SIP registrar module - Send a reply
* \ingroup registrar
*/
#include <stdio.h>
#include "../../ut.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parse_supported.h"
#include "../../data_lump_rpl.h"
#include "../usrloc/usrloc.h"
#include "../../lib/reg/rerrno.h"
#include "../../lib/reg/regtime.h"
#include "../../lib/reg/config.h"
#include "reg_mod.h"
#include "reply.h"
#define MAX_CONTACT_BUFFER 1024
#define E_INFO "P-Registrar-Error: "
#define E_INFO_LEN (sizeof(E_INFO) - 1)
#define CONTACT_BEGIN "Contact: "
#define CONTACT_BEGIN_LEN (sizeof(CONTACT_BEGIN) - 1)
#define Q_PARAM ";q="
#define Q_PARAM_LEN (sizeof(Q_PARAM) - 1)
#define EXPIRES_PARAM ";expires="
#define EXPIRES_PARAM_LEN (sizeof(EXPIRES_PARAM) - 1)
#define SIP_PROTO "sip:"
#define SIP_PROTO_SIZE (sizeof(SIP_PROTO) - 1)
#define PUB_GRUU ";pub-gruu="
#define PUB_GRUU_SIZE (sizeof(PUB_GRUU) - 1)
#define TEMP_GRUU ";temp-gruu="
#define TEMP_GRUU_SIZE (sizeof(TEMP_GRUU) - 1)
#define SIP_INSTANCE ";+sip.instance="
#define SIP_INSTANCE_SIZE (sizeof(SIP_INSTANCE) - 1)
#define TEMP_GRUU_HEADER "tgruu."
#define TEMP_GRUU_HEADER_SIZE (sizeof(TEMP_GRUU_HEADER) - 1)
#define GR_PARAM ";gr="
#define GR_PARAM_SIZE (sizeof(GR_PARAM) - 1)
#define GR_NO_VAL ";gr"
#define GR_NO_VAL_SIZE (sizeof(GR_NO_VAL) - 1)
#define CONTACT_SEP ", "
#define CONTACT_SEP_LEN (sizeof(CONTACT_SEP) - 1)
extern str gruu_secret;
extern int disable_gruu;
str default_gruu_secret=str_init("0p3nS1pS");
/*! \brief
* Buffer for Contact header field
*/
static struct {
char* buf;
int buf_len;
int data_len;
} contact = {0, 0, 0};
static inline int calc_temp_gruu_len(str* aor,str* instance,str *callid)
{
int time_len,temp_gr_len;
int2str((unsigned long)get_act_time(),&time_len);
temp_gr_len = time_len + aor->len + instance->len - 2 + callid->len + 3; /* <instance> and blank spaces */
temp_gr_len = (temp_gr_len/3 + (temp_gr_len%3?1:0))*4; /* base64 encoding */
return temp_gr_len;
}
/*! \brief
* Calculate the length of buffer needed to
* print contacts
*/
static inline unsigned int calc_buf_len(ucontact_t* c,int build_gruu,
struct sip_msg *_m)
{
unsigned int len;
int qlen;
struct socket_info *sock;
len = 0;
while(c) {
if (VALID_CONTACT(c, get_act_time())) {
if (len) len += CONTACT_SEP_LEN;
len += 2 /* < > */ + c->c.len;
qlen = len_q(c->q);
if (qlen) len += Q_PARAM_LEN + qlen;
len += EXPIRES_PARAM_LEN + INT2STR_MAX_LEN;
if (c->received.s) {
len += 1 /* ; */
+ rcv_param.len
+ 1 /* = */
+ 1 /* dquote */
+ c->received.len
+ 1 /* dquote */
;
}
if (build_gruu && c->instance.s) {
sock = (c->sock)?(c->sock):(_m->rcv.bind_address);
/* pub gruu */
len += PUB_GRUU_SIZE
+ 1 /* quote */
+ SIP_PROTO_SIZE
+ c->aor->len
+ (reg_use_domain ?0:(1 /* @ */ + sock->name.len + 1 /* : */ + sock->port_no_str.len))
+ GR_PARAM_SIZE
+ (c->instance.len - 2)
+ 1 /* quote */
;
/* temp gruu */
len += TEMP_GRUU_SIZE
+ 1 /* quote */
+ SIP_PROTO_SIZE
+ TEMP_GRUU_HEADER_SIZE
+ calc_temp_gruu_len(c->aor,&c->instance,&c->callid)
+ 1 /* @ */
+ sock->name.len
+ 1 /* : */
+ sock->port_no_str.len
+ GR_NO_VAL_SIZE
+ 1 /* quote */
;
/* sip.instance */
len += SIP_INSTANCE_SIZE
+ 1 /* quote */
+ (c->instance.len - 2)
+ 1 /* quote */
;
}
}
c = c->next;
}
if (len) len += CONTACT_BEGIN_LEN + CRLF_LEN;
return len;
}
#define MAX_TEMP_GRUU_SIZE 255
static char temp_gruu_buf[MAX_TEMP_GRUU_SIZE];
/* Returns memory from a statically allocated buffer */
char * build_temp_gruu(str *aor,str *instance,str *callid,int *len)
{
int time_len,i;
char *p;
char *time_str = int2str((unsigned long)get_act_time(),&time_len);
str *magic;
*len = time_len + aor->len + instance->len + callid->len + 3 - 2; /* +3 blank spaces, -2 discarded chars of instance in memcpy below */
p = temp_gruu_buf;
memcpy(p,time_str,time_len);
p+=time_len;
*p++=' ';
memcpy(p,aor->s,aor->len);
p+=aor->len;
*p++=' ';
memcpy(p,instance->s+1,instance->len-2);
p+=instance->len-2;
*p++=' ';
memcpy(p,callid->s,callid->len);
LM_DBG("build temp gruu [%.*s]\n",*len,temp_gruu_buf);
if (gruu_secret.s != NULL)
magic = &gruu_secret;
else
magic = &default_gruu_secret;
for (i=0;i<*len;i++)
temp_gruu_buf[i] ^= magic->s[i%magic->len];
return temp_gruu_buf;
}
/*! \brief
* Allocate a memory buffer and print Contact
* header fields into it
*/
int build_contact(ucontact_t* c,struct sip_msg *_m)
{
char *p, *cp, *tmpgr;
int fl, len,grlen;
int build_gruu = 0;
struct socket_info *sock;
if (!disable_gruu && _m->supported && parse_supported(_m) == 0 &&
(get_supported(_m) & F_SUPPORTED_GRUU))
build_gruu=1;
contact.data_len = calc_buf_len(c,build_gruu,_m);
if (!contact.data_len) return 0;
if (!contact.buf || (contact.buf_len < contact.data_len)) {
if (contact.buf) pkg_free(contact.buf);
contact.buf = (char*)pkg_malloc(contact.data_len);
if (!contact.buf) {
contact.data_len = 0;
contact.buf_len = 0;
LM_ERR("no pkg memory left\n");
return -1;
} else {
contact.buf_len = contact.data_len;
}
}
p = contact.buf;
memcpy(p, CONTACT_BEGIN, CONTACT_BEGIN_LEN);
p += CONTACT_BEGIN_LEN;
fl = 0;
while(c) {
if (VALID_CONTACT(c, get_act_time())) {
if (fl) {
memcpy(p, CONTACT_SEP, CONTACT_SEP_LEN);
p += CONTACT_SEP_LEN;
} else {
fl = 1;
}
*p++ = '<';
memcpy(p, c->c.s, c->c.len);
p += c->c.len;
*p++ = '>';
len = len_q(c->q);
if (len) {
memcpy(p, Q_PARAM, Q_PARAM_LEN);
p += Q_PARAM_LEN;
memcpy(p, q2str(c->q, 0), len);
p += len;
}
memcpy(p, EXPIRES_PARAM, EXPIRES_PARAM_LEN);
p += EXPIRES_PARAM_LEN;
cp = int2str((int)(c->expires - get_act_time()), &len);
memcpy(p, cp, len);
p += len;
if (c->received.s) {
*p++ = ';';
memcpy(p, rcv_param.s, rcv_param.len);
p += rcv_param.len;
*p++ = '=';
*p++ = '\"';
memcpy(p, c->received.s, c->received.len);
p += c->received.len;
*p++ = '\"';
}
if (build_gruu && c->instance.s) {
sock = (c->sock)?(c->sock):(_m->rcv.bind_address);
/* build pub GRUU */
memcpy(p,PUB_GRUU,PUB_GRUU_SIZE);
p += PUB_GRUU_SIZE;
*p++ = '\"';
memcpy(p,SIP_PROTO,SIP_PROTO_SIZE);
p += SIP_PROTO_SIZE;
memcpy(p,c->aor->s,c->aor->len);
p += c->aor->len;
if (!reg_use_domain) {
*p++ = '@';
memcpy(p,sock->name.s,sock->name.len);
p += sock->name.len;
*p++ = ':';
memcpy(p,sock->port_no_str.s,sock->port_no_str.len);
p += sock->port_no_str.len;
}
memcpy(p,GR_PARAM,GR_PARAM_SIZE);
p += GR_PARAM_SIZE;
memcpy(p,c->instance.s+1,c->instance.len-2);
p += c->instance.len-2;
*p++ = '\"';
/* build temp GRUU */
memcpy(p,TEMP_GRUU,TEMP_GRUU_SIZE);
p += TEMP_GRUU_SIZE;
*p++ = '\"';
memcpy(p,SIP_PROTO,SIP_PROTO_SIZE);
p += SIP_PROTO_SIZE;
memcpy(p,TEMP_GRUU_HEADER,TEMP_GRUU_HEADER_SIZE);
p += TEMP_GRUU_HEADER_SIZE;
tmpgr = build_temp_gruu(c->aor,&c->instance,&c->callid,&grlen);
base64encode((unsigned char *)p,
(unsigned char *)tmpgr,grlen);
p += calc_temp_gruu_len(c->aor,&c->instance,&c->callid);
*p++ = '@';
memcpy(p,sock->name.s,sock->name.len);
p += sock->name.len;
*p++ = ':';
memcpy(p,sock->port_no_str.s,sock->port_no_str.len);
p += sock->port_no_str.len;
memcpy(p,GR_NO_VAL,GR_NO_VAL_SIZE);
p += GR_NO_VAL_SIZE;
*p++ = '\"';
/* build +sip.instance */
memcpy(p,SIP_INSTANCE,SIP_INSTANCE_SIZE);
p += SIP_INSTANCE_SIZE;
*p++ = '\"';
memcpy(p,c->instance.s+1,c->instance.len-2);
p += c->instance.len-2;
*p++ = '\"';
}
}
c = c->next;
}
memcpy(p, CRLF, CRLF_LEN);
p += CRLF_LEN;
contact.data_len = p - contact.buf;
LM_DBG("created Contact HF: %.*s\n", contact.data_len, contact.buf);
return 0;
}
#define MSG_200 "OK"
#define MSG_400 "Bad Request"
#define MSG_420 "Bad Extension"
#define MSG_500 "Server Internal Error"
#define MSG_503 "Service Unavailable"
#define EI_R_FINE "No problem" /* R_FINE */
#define EI_R_UL_DEL_R "usrloc_record_delete failed" /* R_UL_DEL_R */
#define EI_R_UL_GET_R "usrloc_record_get failed" /* R_UL_GET */
#define EI_R_UL_NEW_R "usrloc_record_new failed" /* R_UL_NEW_R */
#define EI_R_INV_CSEQ "Invalid CSeq number" /* R_INV_CSEQ */
#define EI_R_UL_INS_C "usrloc_contact_insert failed" /* R_UL_INS_C */
#define EI_R_UL_INS_R "usrloc_record_insert failed" /* R_UL_INS_R */
#define EI_R_UL_DEL_C "usrloc_contact_delete failed" /* R_UL_DEL_C */
#define EI_R_UL_UPD_C "usrloc_contact_update failed" /* R_UL_UPD_C */
#define EI_R_TO_USER "No username in To URI" /* R_TO_USER */
#define EI_R_AOR_LEN "Address Of Record too long" /* R_AOR_LEN */
#define EI_R_AOR_PARSE "Error while parsing AOR" /* R_AOR_PARSE */
#define EI_R_INV_EXP "Invalid expires param in contact" /* R_INV_EXP */
#define EI_R_INV_Q "Invalid q param in contact" /* R_INV_Q */
#define EI_R_PARSE "Message parse error" /* R_PARSE */
#define EI_R_TO_MISS "To header not found" /* R_TO_MISS */
#define EI_R_CID_MISS "Call-ID header not found" /* R_CID_MISS */
#define EI_R_CS_MISS "CSeq header not found" /* R_CS_MISS */
#define EI_R_PARSE_EXP "Expires parse error" /* R_PARSE_EXP */
#define EI_R_PARSE_CONT "Contact parse error" /* R_PARSE_CONT */
#define EI_R_STAR_EXP "* used in contact and expires is not zero" /* R_STAR__EXP */
#define EI_R_STAR_CONT "* used in contact and more than 1 contact" /* R_STAR_CONT */
#define EI_R_OOO "Out of order request" /* R_OOO */
#define EI_R_RETRANS "Retransmission" /* R_RETRANS */
#define EI_R_UNESCAPE "Error while unescaping username" /* R_UNESCAPE */
#define EI_R_TOO_MANY "Too many registered contacts" /* R_TOO_MANY */
#define EI_R_CONTACT_LEN "Contact/received too long" /* R_CONTACT_LEN */
#define EI_R_CALLID_LEN "Callid too long" /* R_CALLID_LEN */
#define EI_R_PARSE_PATH "Path parse error" /* R_PARSE_PATH */
#define EI_R_PATH_UNSUP "No support for found Path indicated" /* R_PATH_UNSUP */
#define RETRY_AFTER "Retry-After: "
#define RETRY_AFTER_LEN (sizeof(RETRY_AFTER) - 1)
static int add_retry_after(struct sip_msg* _m)
{
char* buf, *ra_s;
int ra_len;
ra_s = int2str(retry_after, &ra_len);
buf = (char*)pkg_malloc(RETRY_AFTER_LEN + ra_len + CRLF_LEN);
if (!buf) {
LM_ERR("no pkg memory left\n");
return -1;
}
memcpy(buf, RETRY_AFTER, RETRY_AFTER_LEN);
memcpy(buf + RETRY_AFTER_LEN, ra_s, ra_len);
memcpy(buf + RETRY_AFTER_LEN + ra_len, CRLF, CRLF_LEN);
add_lump_rpl(_m, buf, RETRY_AFTER_LEN + ra_len + CRLF_LEN,
LUMP_RPL_HDR | LUMP_RPL_NODUP);
return 0;
}
#define PATH "Path: "
#define PATH_LEN (sizeof(PATH) - 1)
static int add_path(struct sip_msg* _m, str* _p)
{
char* buf;
buf = (char*)pkg_malloc(PATH_LEN + _p->len + CRLF_LEN);
if (!buf) {
LM_ERR("no pkg memory left\n");
return -1;
}
memcpy(buf, PATH, PATH_LEN);
memcpy(buf + PATH_LEN, _p->s, _p->len);
memcpy(buf + PATH_LEN + _p->len, CRLF, CRLF_LEN);
add_lump_rpl(_m, buf, PATH_LEN + _p->len + CRLF_LEN,
LUMP_RPL_HDR | LUMP_RPL_NODUP);
return 0;
}
#define UNSUPPORTED "Unsupported: "
#define UNSUPPORTED_LEN (sizeof(UNSUPPORTED) - 1)
static int add_unsupported(struct sip_msg* _m, str* _p)
{
char* buf;
buf = (char*)pkg_malloc(UNSUPPORTED_LEN + _p->len + CRLF_LEN);
if (!buf) {
LM_ERR("no pkg memory left\n");
return -1;
}
memcpy(buf, UNSUPPORTED, UNSUPPORTED_LEN);
memcpy(buf + UNSUPPORTED_LEN, _p->s, _p->len);
memcpy(buf + UNSUPPORTED_LEN + _p->len, CRLF, CRLF_LEN);
add_lump_rpl(_m, buf, UNSUPPORTED_LEN + _p->len + CRLF_LEN,
LUMP_RPL_HDR | LUMP_RPL_NODUP);
return 0;
}
/*! \brief
* Send a reply
*/
int send_reply(struct sip_msg* _m, unsigned int _flags)
{
str unsup = str_init(SUPPORTED_PATH_STR);
long code;
str msg = str_init(MSG_200); /* makes gcc shut up */
char* buf;
if (contact.data_len > 0) {
add_lump_rpl( _m, contact.buf, contact.data_len, LUMP_RPL_HDR|LUMP_RPL_NODUP|LUMP_RPL_NOFREE);
contact.data_len = 0;
}
if (rerrno == R_FINE && (_flags®_SAVE_PATH_FLAG) && _m->path_vec.s) {
if ( (_flags®_SAVE_PATH_OFF_FLAG)==0 ) {
if (parse_supported(_m)<0 && (_flags®_SAVE_PATH_STRICT_FLAG)) {
rerrno = R_PATH_UNSUP;
if (add_unsupported(_m, &unsup) < 0)
return -1;
if (add_path(_m, &_m->path_vec) < 0)
return -1;
}
else if (get_supported(_m) & F_SUPPORTED_PATH) {
if (add_path(_m, &_m->path_vec) < 0)
return -1;
} else if ((_flags®_SAVE_PATH_STRICT_FLAG)) {
rerrno = R_PATH_UNSUP;
if (add_unsupported(_m, &unsup) < 0)
return -1;
if (add_path(_m, &_m->path_vec) < 0)
return -1;
}
}
}
code = rerr_codes[rerrno];
switch(code) {
case 200: msg.s = MSG_200; msg.len = sizeof(MSG_200)-1; break;
case 400: msg.s = MSG_400; msg.len = sizeof(MSG_400)-1;break;
case 420: msg.s = MSG_420; msg.len = sizeof(MSG_420)-1;break;
case 500: msg.s = MSG_500; msg.len = sizeof(MSG_500)-1;break;
case 503: msg.s = MSG_503; msg.len = sizeof(MSG_503)-1;break;
}
if (code != 200) {
buf = (char*)pkg_malloc(E_INFO_LEN + error_info[rerrno].len + CRLF_LEN + 1);
if (!buf) {
LM_ERR("no pkg memory left\n");
return -1;
}
memcpy(buf, E_INFO, E_INFO_LEN);
memcpy(buf + E_INFO_LEN, error_info[rerrno].s, error_info[rerrno].len);
memcpy(buf + E_INFO_LEN + error_info[rerrno].len, CRLF, CRLF_LEN);
add_lump_rpl( _m, buf, E_INFO_LEN + error_info[rerrno].len + CRLF_LEN,
LUMP_RPL_HDR|LUMP_RPL_NODUP);
if (code >= 500 && code < 600 && retry_after) {
if (add_retry_after(_m) < 0) {
return -1;
}
}
}
if (sigb.reply(_m, code, &msg, NULL) == -1) {
LM_ERR("failed to send %ld %.*s\n", code, msg.len,msg.s);
return -1;
} else return 0;
}
/*! \brief
* Release contact buffer if any
*/
void free_contact_buf(void)
{
if (contact.buf) {
pkg_free(contact.buf);
contact.buf = 0;
contact.buf_len = 0;
contact.data_len = 0;
}
}