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tcp_read.c
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tcp_read.c
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/*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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
*
* Kamailio 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
*/
/** Kamailio core :: tcp readers processes, tcp read and pre-parse msg. functions.
* @file tcp_read.c
* @ingroup core
* Module: @ref core
*/
#ifdef USE_TCP
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h> /* for abort() */
#include "dprint.h"
#include "tcp_conn.h"
#include "tcp_read.h"
#include "tcp_stats.h"
#include "tcp_ev.h"
#include "pass_fd.h"
#include "globals.h"
#include "receive.h"
#include "timer.h"
#include "local_timer.h"
#include "ut.h"
#include "trim.h"
#include "pt.h"
#include "cfg/cfg_struct.h"
#ifdef CORE_TLS
#include "tls/tls_server.h"
#else
#include "tls_hooks.h"
#endif /* CORE_TLS */
#ifdef USE_DST_BLACKLIST
#include "dst_blacklist.h"
#endif /* USE_DST_BLACKLIST */
#define HANDLE_IO_INLINE
#include "io_wait.h"
#include <fcntl.h> /* must be included after io_wait.h if SIGIO_RT is used */
#include "tsend.h"
#include "forward.h"
#include "events.h"
#include "stun.h"
#ifdef READ_HTTP11
#define HTTP11CONTINUE "HTTP/1.1 100 Continue\r\nContent-Length: 0\r\n\r\n"
#define HTTP11CONTINUE_LEN (sizeof(HTTP11CONTINUE)-1)
#endif
#define TCPCONN_TIMEOUT_MIN_RUN 1 /* run the timers each new tick */
/* types used in io_wait* */
enum fd_types { F_NONE, F_TCPMAIN, F_TCPCONN };
/* list of tcp connections handled by this process */
static struct tcp_connection* tcp_conn_lst=0;
static io_wait_h io_w; /* io_wait handler*/
static int tcpmain_sock=-1;
static struct local_timer tcp_reader_ltimer;
static ticks_t tcp_reader_prev_ticks;
int is_msg_complete(struct tcp_req* r);
/**
* control cloning of TCP receive buffer
* - needed for operations working directly inside the buffer
* (like msg_apply_changes())
*/
#define TCP_CLONE_RCVBUF
static int tcp_clone_rcvbuf = 0;
int tcp_set_clone_rcvbuf(int v)
{
int r;
r = tcp_clone_rcvbuf;
tcp_clone_rcvbuf = v;
return r;
}
#ifdef READ_HTTP11
static inline char *strfindcasestrz(str *haystack, char *needlez)
{
int i,j;
str needle;
needle.s = needlez;
needle.len = strlen(needlez);
for(i=0;i<haystack->len-needle.len;i++) {
for(j=0;j<needle.len;j++) {
if ( !((haystack->s[i+j]==needle.s[j]) ||
( isalpha((int)haystack->s[i+j])
&& ((haystack->s[i+j])^(needle.s[j]))==0x20 )) )
break;
}
if (j==needle.len)
return haystack->s+i;
}
return 0;
}
int tcp_http11_continue(struct tcp_connection *c)
{
struct dest_info dst;
char *p;
struct msg_start fline;
int ret;
str msg;
ret = 0;
msg.s = c->req.start;
msg.len = c->req.pos - c->req.start;
#ifdef READ_MSRP
/* skip if MSRP message */
if(c->req.flags&F_TCP_REQ_MSRP_FRAME)
return 0;
#endif
p = parse_first_line(msg.s, msg.len, &fline);
if(p==NULL)
return 0;
if(fline.type!=SIP_REQUEST)
return 0;
/* check if http request */
if(fline.u.request.version.len < HTTP_VERSION_LEN
|| strncasecmp(fline.u.request.version.s,
HTTP_VERSION, HTTP_VERSION_LEN))
return 0;
/* check for Expect header */
if(strfindcasestrz(&msg, "Expect: 100-continue")!=NULL)
{
init_dst_from_rcv(&dst, &c->rcv);
if (tcp_send(&dst, 0, HTTP11CONTINUE, HTTP11CONTINUE_LEN) < 0) {
LM_ERR("HTTP/1.1 continue failed\n");
}
}
/* check for Transfer-Encoding header */
if(strfindcasestrz(&msg, "Transfer-Encoding: chunked")!=NULL)
{
c->req.flags |= F_TCP_REQ_BCHUNKED;
ret = 1;
}
/* check for HTTP Via header
* - HTTP Via format is different that SIP Via
* - workaround: replace with Hia to be ignored by SIP parser
*/
if((p=strfindcasestrz(&msg, "\nVia:"))!=NULL)
{
p++;
*p = 'H';
LM_DBG("replaced HTTP Via with Hia [[\n%.*s]]\n", msg.len, msg.s);
}
return ret;
}
#endif /* HTTP11 */
/** reads data from an existing tcp connection.
* Side-effects: blacklisting, sets connection state to S_CONN_OK, tcp stats.
* @param fd - connection file descriptor
* @param c - tcp connection structure. c->state might be changed and
* receive info might be used for blacklisting.
* @param buf - buffer where the received data will be stored.
* @param b_size - buffer size.
* @param flags - value/result - used to signal a seen or "forced" EOF on the
* connection (when it is known that no more data will come after the
* current socket buffer is emptied )=> return/signal EOF on the first
* short read (=> don't use it on POLLPRI, as OOB data will cause short
* reads even if there are still remaining bytes in the socket buffer)
* input: RD_CONN_FORCE_EOF - force EOF after the first successful read
* (bytes_read >=0 )
* output: RD_CONN_SHORT_READ - if the read exhausted all the bytes
* in the socket read buffer.
* RD_CONN_EOF - if EOF detected (0 bytes read) or forced via
* RD_CONN_FORCE_EOF.
* RD_CONN_REPEAT_READ - the read should be repeated immediately
* (used only by the tls code for now).
* Note: RD_CONN_SHORT_READ & RD_CONN_EOF _are_ not cleared internally,
* so one should clear them before calling this function.
* @return number of bytes read, 0 on EOF or -1 on error,
* on EOF it also sets c->state to S_CONN_EOF.
* (to distinguish from reads that would block which could return 0)
* RD_CONN_SHORT_READ is also set in *flags for short reads.
* EOF checking should be done by checking the RD_CONN_EOF flag.
*/
int tcp_read_data(int fd, struct tcp_connection *c,
char* buf, int b_size, int* flags)
{
int bytes_read;
again:
bytes_read=read(fd, buf, b_size);
if (likely(bytes_read!=b_size)){
if(unlikely(bytes_read==-1)){
if (errno == EWOULDBLOCK || errno == EAGAIN){
bytes_read=0; /* nothing has been read */
}else if (errno == EINTR) goto again;
else{
if (unlikely(c->state==S_CONN_CONNECT)){
switch(errno){
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
dst_blacklist_su(BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su,
&c->send_flags, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
break;
case ETIMEDOUT:
#ifdef USE_DST_BLACKLIST
dst_blacklist_su(BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su,
&c->send_flags, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
break;
default:
TCP_EV_CONNECT_ERR(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
}
TCP_STATS_CONNECT_FAILED();
}else{
switch(errno){
case ECONNRESET:
TCP_STATS_CON_RESET();
case ETIMEDOUT:
#ifdef USE_DST_BLACKLIST
dst_blacklist_su(BLST_ERR_SEND, c->rcv.proto,
&c->rcv.src_su,
&c->send_flags, 0);
#endif /* USE_DST_BLACKLIST */
break;
}
}
LOG(cfg_get(core, core_cfg, corelog),
"error reading: %s (%d)\n", strerror(errno), errno);
return -1;
}
}else if (unlikely((bytes_read==0) ||
(*flags & RD_CONN_FORCE_EOF))){
c->state=S_CONN_EOF;
*flags|=RD_CONN_EOF;
DBG("EOF on %p, FD %d\n", c, fd);
}else{
if (unlikely(c->state==S_CONN_CONNECT || c->state==S_CONN_ACCEPT)){
TCP_STATS_ESTABLISHED(c->state);
c->state=S_CONN_OK;
}
}
/* short read */
*flags|=RD_CONN_SHORT_READ;
}else{ /* else normal full read */
if (unlikely(c->state==S_CONN_CONNECT || c->state==S_CONN_ACCEPT)){
TCP_STATS_ESTABLISHED(c->state);
c->state=S_CONN_OK;
}
}
return bytes_read;
}
/* reads next available bytes
* c- tcp connection used for reading, tcp_read changes also c->state on
* EOF and c->req.error on read error
* * flags - value/result - used to signal a seen or "forced" EOF on the
* connection (when it is known that no more data will come after the
* current socket buffer is emptied )=> return/signal EOF on the first
* short read (=> don't use it on POLLPRI, as OOB data will cause short
* reads even if there are still remaining bytes in the socket buffer)
* return number of bytes read, 0 on EOF or -1 on error,
* on EOF it also sets c->state to S_CONN_EOF.
* (to distinguish from reads that would block which could return 0)
* RD_CONN_SHORT_READ is also set in *flags for short reads.
* sets also r->error */
int tcp_read(struct tcp_connection *c, int* flags)
{
int bytes_free, bytes_read;
struct tcp_req *r;
int fd;
r=&c->req;
fd=c->fd;
bytes_free=r->b_size- (int)(r->pos - r->buf);
if (unlikely(bytes_free==0)){
LM_ERR("buffer overrun, dropping\n");
r->error=TCP_REQ_OVERRUN;
return -1;
}
bytes_read = tcp_read_data(fd, c, r->pos, bytes_free, flags);
if (unlikely(bytes_read < 0)){
r->error=TCP_READ_ERROR;
return -1;
}
#ifdef EXTRA_DEBUG
DBG("tcp_read: read %d bytes:\n%.*s\n", bytes_read, bytes_read, r->pos);
#endif
r->pos+=bytes_read;
return bytes_read;
}
/* reads all headers (until double crlf), & parses the content-length header
* (WARNING: inefficient, tries to reuse receive_msg but will go through
* the headers twice [once here looking for Content-Length and for the end
* of the headers and once in receive_msg]; a more speed efficient version will
* result in either major code duplication or major changes to the receive code)
* returns number of bytes read & sets r->state & r->body
* when either r->body!=0 or r->state==H_BODY =>
* all headers have been read. It should be called in a while loop.
* returns < 0 if error or 0 if EOF */
int tcp_read_headers(struct tcp_connection *c, int* read_flags)
{
int bytes, remaining;
char *p;
struct tcp_req* r;
unsigned int mc; /* magic cookie */
unsigned short body_len;
#ifdef READ_MSRP
char *mfline;
str mtransid;
#endif
#define crlf_default_skip_case \
case '\n': \
r->state=H_LF; \
break; \
default: \
r->state=H_SKIP
#define content_len_beg_case \
case ' ': \
case '\t': \
if (!TCP_REQ_HAS_CLEN(r)) r->state=H_STARTWS; \
else r->state=H_SKIP; \
/* not interested if we already found one */ \
break; \
case 'C': \
case 'c': \
if(!TCP_REQ_HAS_CLEN(r)) r->state=H_CONT_LEN1; \
else r->state=H_SKIP; \
break; \
case 'l': \
case 'L': \
/* short form for Content-Length */ \
if (!TCP_REQ_HAS_CLEN(r)) r->state=H_L_COLON; \
else r->state=H_SKIP; \
break
#define change_state(upper, lower, newstate)\
switch(*p){ \
case upper: \
case lower: \
r->state=(newstate); break; \
crlf_default_skip_case; \
}
#define change_state_case(state0, upper, lower, newstate)\
case state0: \
change_state(upper, lower, newstate); \
p++; \
break
r=&c->req;
/* if we still have some unparsed part, parse it first, don't do the read*/
if (unlikely(r->parsed<r->pos)){
bytes=0;
}else{
#ifdef USE_TLS
if (unlikely(c->type==PROTO_TLS))
bytes=tls_read(c, read_flags);
else
#endif
bytes=tcp_read(c, read_flags);
if (bytes<=0) return bytes;
}
p=r->parsed;
while(p<r->pos && r->error==TCP_REQ_OK){
switch((unsigned char)r->state){
case H_BODY: /* read the body*/
remaining=r->pos-p;
if (remaining>r->bytes_to_go) remaining=r->bytes_to_go;
r->bytes_to_go-=remaining;
p+=remaining;
if (r->bytes_to_go==0){
r->flags|=F_TCP_REQ_COMPLETE;
goto skip;
}
break;
case H_SKIP:
/* find lf, we are in this state if we are not interested
* in anything till end of line*/
p=q_memchr(p, '\n', r->pos-p);
if (p){
#ifdef READ_MSRP
/* catch if it is MSRP or not with first '\n' */
if(!((r->flags&F_TCP_REQ_MSRP_NO)
|| (r->flags&F_TCP_REQ_MSRP_FRAME))) {
if((r->pos - r->start)>5
&& strncmp(r->start, "MSRP ", 5)==0)
{
r->flags |= F_TCP_REQ_MSRP_FRAME;
} else {
r->flags |= F_TCP_REQ_MSRP_NO;
}
}
#endif
p++;
r->state=H_LF;
}else{
p=r->pos;
}
break;
case H_LF:
/* terminate on LF CR LF or LF LF */
switch (*p){
case '\r':
r->state=H_LFCR;
break;
case '\n':
/* found LF LF */
r->state=H_BODY;
#ifdef READ_HTTP11
if (cfg_get(tcp, tcp_cfg, accept_no_cl)!=0)
tcp_http11_continue(c);
#endif
if (TCP_REQ_HAS_CLEN(r)){
r->body=p+1;
r->bytes_to_go=r->content_len;
if (r->bytes_to_go==0){
r->flags|=F_TCP_REQ_COMPLETE;
p++;
goto skip;
}
}else{
if(cfg_get(tcp, tcp_cfg, accept_no_cl)!=0) {
#ifdef READ_MSRP
/* if MSRP message */
if(c->req.flags&F_TCP_REQ_MSRP_FRAME)
{
r->body=p+1;
/* at least 3 bytes: 0\r\n */
r->bytes_to_go=3;
p++;
r->content_len = 0;
r->state=H_MSRP_BODY;
break;
}
#endif
#ifdef READ_HTTP11
if(TCP_REQ_BCHUNKED(r)) {
r->body=p+1;
/* at least 3 bytes: 0\r\n */
r->bytes_to_go=3;
p++;
r->content_len = 0;
r->state=H_HTTP11_CHUNK_START;
break;
}
#endif
r->body=p+1;
r->bytes_to_go=0;
r->flags|=F_TCP_REQ_COMPLETE;
p++;
goto skip;
} else {
DBG("tcp_read_headers: ERROR: no clen, p=%X\n",
*p);
r->error=TCP_REQ_BAD_LEN;
}
}
break;
case '-':
r->state=H_SKIP;
#ifdef READ_MSRP
/* catch end of MSRP frame without body
* '-------sessid$\r\n'
* follows headers wihtout extra CRLF */
if(r->flags&F_TCP_REQ_MSRP_FRAME) {
p--;
r->state=H_MSRP_BODY_END;
}
#endif
break;
content_len_beg_case;
default:
r->state=H_SKIP;
}
p++;
break;
case H_LFCR:
if (*p=='\n'){
/* found LF CR LF */
r->state=H_BODY;
#ifdef READ_HTTP11
if (cfg_get(tcp, tcp_cfg, accept_no_cl)!=0)
tcp_http11_continue(c);
#endif
if (TCP_REQ_HAS_CLEN(r)){
r->body=p+1;
r->bytes_to_go=r->content_len;
if (r->bytes_to_go==0){
r->flags|=F_TCP_REQ_COMPLETE;
p++;
goto skip;
}
}else{
if (cfg_get(tcp, tcp_cfg, accept_no_cl)!=0) {
#ifdef READ_MSRP
/* if MSRP message */
if(c->req.flags&F_TCP_REQ_MSRP_FRAME)
{
r->body=p+1;
/* at least 3 bytes: 0\r\n */
r->bytes_to_go=3;
p++;
r->content_len = 0;
r->state=H_MSRP_BODY;
break;
}
#endif
#ifdef READ_HTTP11
if(TCP_REQ_BCHUNKED(r)) {
r->body=p+1;
/* at least 3 bytes: 0\r\n */
r->bytes_to_go=3;
p++;
r->content_len = 0;
r->state=H_HTTP11_CHUNK_START;
break;
}
#endif
r->body=p+1;
r->bytes_to_go=0;
r->flags|=F_TCP_REQ_COMPLETE;
p++;
goto skip;
} else {
DBG("tcp_read_headers: ERROR: no clen, p=%X\n",
*p);
r->error=TCP_REQ_BAD_LEN;
}
}
}else r->state=H_SKIP;
p++;
break;
case H_STARTWS:
switch (*p){
content_len_beg_case;
crlf_default_skip_case;
}
p++;
break;
case H_SKIP_EMPTY:
switch (*p){
case '\n':
break;
case '\r':
if (cfg_get(tcp, tcp_cfg, crlf_ping)) {
r->state=H_SKIP_EMPTY_CR_FOUND;
r->start=p;
}
break;
case ' ':
case '\t':
/* skip empty lines */
break;
case 'C':
case 'c':
r->state=H_CONT_LEN1;
r->start=p;
break;
case 'l':
case 'L':
/* short form for Content-Length */
r->state=H_L_COLON;
r->start=p;
break;
default:
/* stun test */
if (unlikely(sr_event_enabled(SREV_STUN_IN)) && (unsigned char)*p == 0x00) {
r->state=H_STUN_MSG;
/* body will used as pointer to the last used byte */
r->body=p;
r->content_len = 0;
DBG("stun msg detected\n");
} else {
r->state=H_SKIP;
}
r->start=p;
};
p++;
break;
case H_SKIP_EMPTY_CR_FOUND:
if (*p=='\n'){
r->state=H_SKIP_EMPTY_CRLF_FOUND;
p++;
}else{
r->state=H_SKIP_EMPTY;
}
break;
case H_SKIP_EMPTY_CRLF_FOUND:
if (*p=='\r'){
r->state = H_SKIP_EMPTY_CRLFCR_FOUND;
p++;
}else{
r->state = H_SKIP_EMPTY;
}
break;
case H_SKIP_EMPTY_CRLFCR_FOUND:
if (*p=='\n'){
r->state = H_PING_CRLF;
r->flags |= F_TCP_REQ_HAS_CLEN |
F_TCP_REQ_COMPLETE; /* hack to avoid error check */
p++;
goto skip;
}else{
r->state = H_SKIP_EMPTY;
}
break;
case H_STUN_MSG:
if ((r->pos - r->body) >= sizeof(struct stun_hdr)) {
/* copy second short from buffer where should be body
* length
*/
memcpy(&body_len, &r->start[sizeof(unsigned short)],
sizeof(unsigned short));
body_len = ntohs(body_len);
/* check if there is valid magic cookie */
memcpy(&mc, &r->start[sizeof(unsigned int)],
sizeof(unsigned int));
mc = ntohl(mc);
/* using has_content_len as a flag if there should be
* fingerprint or no
*/
r->flags |= (mc == MAGIC_COOKIE) ? F_TCP_REQ_HAS_CLEN : 0;
r->body += sizeof(struct stun_hdr);
p = r->body;
if (body_len > 0) {
r->state = H_STUN_READ_BODY;
}
else {
if (is_msg_complete(r) != 0) {
goto skip;
}
else {
/* set content_len to length of fingerprint */
body_len = sizeof(struct stun_attr) + 20;
/* 20 is SHA_DIGEST_LENGTH from openssl/sha.h */
}
}
r->content_len=body_len;
}
else {
p = r->pos;
}
break;
case H_STUN_READ_BODY:
/* check if the whole body was read */
body_len=r->content_len;
if ((r->pos - r->body) >= body_len) {
r->body += body_len;
p = r->body;
if (is_msg_complete(r) != 0) {
r->content_len=0;
goto skip;
}
else {
/* set content_len to length of fingerprint */
body_len = sizeof(struct stun_attr) + 20;
/* 20 is SHA_DIGEST_LENGTH from openssl/sha.h */
r->content_len=body_len;
}
}
else {
p = r->pos;
}
break;
case H_STUN_FP:
/* content_len contains length of fingerprint in this place! */
body_len=r->content_len;
if ((r->pos - r->body) >= body_len) {
r->body += body_len;
p = r->body;
r->state = H_STUN_END;
r->flags |= F_TCP_REQ_COMPLETE |
F_TCP_REQ_HAS_CLEN; /* hack to avoid error check */
r->content_len=0;
goto skip;
}
else {
p = r->pos;
}
break;
change_state_case(H_CONT_LEN1, 'O', 'o', H_CONT_LEN2);
change_state_case(H_CONT_LEN2, 'N', 'n', H_CONT_LEN3);
change_state_case(H_CONT_LEN3, 'T', 't', H_CONT_LEN4);
change_state_case(H_CONT_LEN4, 'E', 'e', H_CONT_LEN5);
change_state_case(H_CONT_LEN5, 'N', 'n', H_CONT_LEN6);
change_state_case(H_CONT_LEN6, 'T', 't', H_CONT_LEN7);
change_state_case(H_CONT_LEN7, '-', '_', H_CONT_LEN8);
change_state_case(H_CONT_LEN8, 'L', 'l', H_CONT_LEN9);
change_state_case(H_CONT_LEN9, 'E', 'e', H_CONT_LEN10);
change_state_case(H_CONT_LEN10, 'N', 'n', H_CONT_LEN11);
change_state_case(H_CONT_LEN11, 'G', 'g', H_CONT_LEN12);
change_state_case(H_CONT_LEN12, 'T', 't', H_CONT_LEN13);
change_state_case(H_CONT_LEN13, 'H', 'h', H_L_COLON);
case H_L_COLON:
switch(*p){
case ' ':
case '\t':
break; /* skip space */
case ':':
r->state=H_CONT_LEN_BODY;
break;
crlf_default_skip_case;
};
p++;
break;
case H_CONT_LEN_BODY:
switch(*p){
case ' ':
case '\t':
break; /* eat space */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
r->state=H_CONT_LEN_BODY_PARSE;
r->content_len=(*p-'0');
break;
/*FIXME: content length on different lines ! */
crlf_default_skip_case;
}
p++;
break;
case H_CONT_LEN_BODY_PARSE:
switch(*p){
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
r->content_len=r->content_len*10+(*p-'0');
break;
case '\r':
case ' ':
case '\t': /* FIXME: check if line contains only WS */
if(r->content_len<0) {
LM_ERR("bad Content-Length header value %d in"
" state %d\n", r->content_len, r->state);
r->content_len=0;
r->error=TCP_REQ_BAD_LEN;
r->state=H_SKIP; /* skip now */
}
r->state=H_SKIP;
r->flags|=F_TCP_REQ_HAS_CLEN;
break;
case '\n':
/* end of line, parse successful */
if(r->content_len<0) {
LM_ERR("bad Content-Length header value %d in"
" state %d\n", r->content_len, r->state);
r->content_len=0;
r->error=TCP_REQ_BAD_LEN;
r->state=H_SKIP; /* skip now */
}
r->state=H_LF;
r->flags|=F_TCP_REQ_HAS_CLEN;
break;
default:
LM_ERR("bad Content-Length header value, unexpected "
"char %c in state %d\n", *p, r->state);
r->state=H_SKIP; /* try to find another?*/
}
p++;
break;
#ifdef READ_HTTP11
case H_HTTP11_CHUNK_START: /* start a new body chunk: SIZE\r\nBODY\r\n */
r->chunk_size = 0;
r->state = H_HTTP11_CHUNK_SIZE;
break;
case H_HTTP11_CHUNK_BODY: /* content of chunnk */
remaining=r->pos-p;
if (remaining>r->bytes_to_go) remaining=r->bytes_to_go;
r->bytes_to_go-=remaining;
p+=remaining;
if (r->bytes_to_go==0){
r->state = H_HTTP11_CHUNK_END;
/* shift back body content */
if(r->chunk_size>0 && p-r->chunk_size>r->body) {
memmove(r->body + r->content_len, p - r->chunk_size,
r->chunk_size);
r->content_len += r->chunk_size;
}
goto skip;
}
break;
case H_HTTP11_CHUNK_END:
switch(*p){
case '\r':
case ' ':
case '\t': /* skip */
break;
case '\n':
r->state = H_HTTP11_CHUNK_START;
break;
default:
LM_ERR("bad chunk, unexpected "
"char %c in state %d\n", *p, r->state);
r->state=H_SKIP; /* try to find another?*/
}
p++;
break;
case H_HTTP11_CHUNK_SIZE:
switch(*p){
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9':
r->chunk_size <<= 4;
r->chunk_size += *p - '0';
break;
case 'a': case 'b': case 'c': case 'd':
case 'e': case 'f':
r->chunk_size <<= 4;
r->chunk_size += *p - 'a' + 10;
break;
case 'A': case 'B': case 'C': case 'D':
case 'E': case 'F':
r->chunk_size <<= 4;
r->chunk_size += *p - 'A' + 10;
break;
case '\r':
case ' ':
case '\t': /* skip */
break;
case '\n':
/* end of line, parse successful */
r->state=H_HTTP11_CHUNK_BODY;
r->bytes_to_go = r->chunk_size;
if (r->bytes_to_go==0){
r->state=H_HTTP11_CHUNK_FINISH;
r->flags|=F_TCP_REQ_COMPLETE;
p++;
goto skip;
}
break;
default:
LM_ERR("bad chunk size value, unexpected "
"char %c in state %d\n", *p, r->state);
r->state=H_SKIP; /* try to find another?*/
}
p++;
break;
#endif
#ifdef READ_MSRP
case H_MSRP_BODY: /* body of msrp frame */
/* find lf, we are in this state if we are not interested
* in anything till end of line*/
r->flags |= F_TCP_REQ_MSRP_BODY;
p = q_memchr(p, '\n', r->pos-p);
if (p) {
p++;
r->state=H_MSRP_BODY_LF;
} else {
p=r->pos;
}
break;
case H_MSRP_BODY_LF: /* LF in body of msrp frame */
switch (*p) {
case '-':
p--;
r->state=H_MSRP_BODY_END;
break;
default:
r->state=H_MSRP_BODY;
}
p++;
break;
case H_MSRP_BODY_END: /* end of body for msrp frame */
/* find LF and check if it is end-line */
p = q_memchr(p, '\n', r->pos-p);
if (p) {
/* check if it is end line '-------sessid$\r\n' */
if(r->pos - r->start < 10) {
LM_ERR("weird situation when reading MSRP frame"
" - continue reading\n");
/* *p=='\n' */
r->state=H_MSRP_BODY_LF;
p++;
break;
}
if(*(p-1)!='\r') {
/* not ending in '\r\n' - not end-line */
/* *p=='\n' */
r->state=H_MSRP_BODY_LF;
p++;
break;
}
/* locate transaction id in first line
* -- first line exists, that's why we are here */
mfline = q_memchr(r->start, '\n', r->pos-r->start);
mtransid.s = q_memchr(r->start + 5 /* 'MSRP ' */, ' ',
mfline - r->start);
mtransid.len = mtransid.s - r->start - 5;
mtransid.s = r->start + 5;
trim(&mtransid);
if(memcmp(mtransid.s,
p - 1 /*\r*/ - 1 /* '+'|'#'|'$' */ - mtransid.len,
mtransid.len)!=0) {
/* no match on session id - not end-line */
/* *p=='\n' */
r->state=H_MSRP_BODY_LF;
p++;
break;
}
if(memcmp(p - 1 /*\r*/ - 1 /* '+'|'#'|'$' */ - mtransid.len
- 7 /* 7 x '-' */ - 1 /* '\n' */, "\n-------",
8)!=0) {
/* no match on "\n-------" - not end-line */
/* *p=='\n' */
r->state=H_MSRP_BODY_LF;
p++;
break;
}
r->state=H_MSRP_FINISH;
r->flags|=F_TCP_REQ_COMPLETE;