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kamailio/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 */
static int tcp_make_closed_event(struct receive_info* rcv_info, struct tcp_connection* con)
{
int ret;
tcp_event_info_t tev;
ret = 0;
LM_DBG("TCP closed event creation triggered\n");
if(likely(sr_event_enabled(SREV_TCP_CLOSED))) {
memset(&tev, 0, sizeof(tcp_event_info_t));
tev.type = SREV_TCP_CLOSED;
tev.rcv = rcv_info;
tev.con = con;
ret = sr_event_exec(SREV_TCP_CLOSED, (void*)(&tev));
} else {
LM_DBG("no callback registering for handling TCP closed event - dropping!\n");
}
return ret;
}
/** 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) ([%s]:%u ->",
strerror(errno), errno,
ip_addr2a(&c->rcv.src_ip), c->rcv.src_port);
LOG(cfg_get(core, core_cfg, corelog),"-> [%s]:%u)\n", ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port);
if((errno == ECONNRESET || errno == ETIMEDOUT) && likely(c->rcv.proto_reserved1 != 0)){
tcp_make_closed_event(&c->rcv, c);
}
return -1;
}
}else if (unlikely((bytes_read==0) ||
(*flags & RD_CONN_FORCE_EOF))){
c->state=S_CONN_EOF;
*flags|=RD_CONN_EOF;
if (likely(c->rcv.proto_reserved1 != 0)){
tcp_make_closed_event(&c->rcv, c);
}
LM_DBG("EOF on %p, FD %d ([%s]:%u ->", c, fd, ip_addr2a(&c->rcv.src_ip), c->rcv.src_port);
LM_DBG("-> [%s]:%u)\n", ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port);
}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 ([%s]:%u -> [%s]:%u)\n",
ip_addr2a(&c->rcv.src_ip), c->rcv.src_port,
ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port);
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
LM_DBG("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 {
LM_DBG("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 {
LM_DBG("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;
LM_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;
p++;
goto skip;
} else {
p=r->pos;
}
break;
#endif
default:
LM_CRIT("unexpected state %d\n", r->state);
abort();
}
}
skip:
r->parsed=p;
return bytes;
}
#ifdef READ_MSRP
int msrp_process_msg(char* tcpbuf, unsigned int len,
struct receive_info* rcv_info, struct tcp_connection* con)
{
int ret;
tcp_event_info_t tev;
ret = 0;
LM_DBG("MSRP Message: [[>>>\n%.*s<<<]]\n", len, tcpbuf);
if(likely(sr_event_enabled(SREV_TCP_MSRP_FRAME))) {
memset(&tev, 0, sizeof(tcp_event_info_t));
tev.type = SREV_TCP_MSRP_FRAME;
tev.buf = tcpbuf;
tev.len = len;
tev.rcv = rcv_info;
tev.con = con;
ret = sr_event_exec(SREV_TCP_MSRP_FRAME, (void*)(&tev));
} else {
LM_DBG("no callback registering for handling MSRP - dropping!\n");
}
return ret;
}
#endif
#ifdef READ_WS
static int tcp_read_ws(struct tcp_connection *c, int* read_flags)
{
int bytes, size, pos, mask_present;
unsigned int len;
char *p;
struct tcp_req *r;
r=&c->req;
#ifdef USE_TLS
if (unlikely(c->type == PROTO_WSS))
bytes = tls_read(c, read_flags);
else
#endif
bytes = tcp_read(c, read_flags);
if (bytes <= 0)
{
if (likely(r->parsed >= r->pos))
return 0;
}
size = r->pos - r->parsed;
p = r->parsed;
pos = 0;
/*
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-------+-+-------------+-------------------------------+
|F|R|R|R| opcode|M| Payload len | Extended payload length |
|I|S|S|S| (4) |A| (7) | (16/64) |
|N|V|V|V| |S| | (if payload len==126/127) |
| |1|2|3| |K| | |
+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
| Extended payload length continued, if payload len == 127 |
+ - - - - - - - - - - - - - - - +-------------------------------+
| |Masking-key, if MASK set to 1 |
+-------------------------------+-------------------------------+
| Masking-key (continued) | Payload Data |
+-------------------------------- - - - - - - - - - - - - - - - +
: Payload Data continued ... :
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
| Payload Data continued ... |
+---------------------------------------------------------------+
Do minimal parse required to make sure the full message has been
received (websocket module will do full parse and validation).
*/
/* Process first two bytes */
if (size < pos + 2)
goto skip;
pos++;
mask_present = p[pos] & 0x80;
len = (p[pos++] & 0xff) & ~0x80;
/* Work out real length */
if (len == 126)
{
if (size < pos + 2)
goto skip;
len = ((p[pos + 0] & 0xff) << 8)
| ((p[pos + 1] & 0xff) << 0);
pos += 2;
}
else if (len == 127)
{
if (size < pos + 8)
goto skip;
/* Only decoding the last four bytes of the length...
This limits the size of WebSocket messages that can be
handled to 2^32 - which should be plenty for SIP! */
len = ((p[pos + 4] & 0xff) << 24)
| ((p[pos + 5] & 0xff) << 16)
| ((p[pos + 6] & 0xff) << 8)
| ((p[pos + 7] & 0xff) << 0);
pos += 8;
}
/* Skip mask */
if (mask_present)
{
if (size < pos + 4)
goto skip;
pos += 4;
}
/* Now check the whole message has been received */
if (size < pos + len)
goto skip;
pos += len;
r->flags |= F_TCP_REQ_COMPLETE;
r->parsed = &p[pos];
skip:
return bytes;
}
static int ws_process_msg(char* tcpbuf, unsigned int len,
struct receive_info* rcv_info, struct tcp_connection* con)
{
int ret;
tcp_event_info_t tev;
ret = 0;
LM_DBG("WebSocket Message: [[>>>\n%.*s<<<]]\n", len, tcpbuf);
if(likely(sr_event_enabled(SREV_TCP_WS_FRAME_IN))) {
memset(&tev, 0, sizeof(tcp_event_info_t));
tev.type = SREV_TCP_WS_FRAME_IN;
tev.buf = tcpbuf;
tev.len = len;
tev.rcv = rcv_info;
tev.con = con;
ret = sr_event_exec(SREV_TCP_WS_FRAME_IN, (void*)(&tev));
} else {
LM_DBG("no callback registering for handling WebSockets - dropping!\n");
}
return ret;
}
#endif
/**
* @brief wrapper around receive_msg() to clone the tcpbuf content
*
* When receiving over TCP, tcpbuf points inside the TCP stream buffer, but during
* processing of config, msg->buf content might be changed and may corrupt
* the content of the stream. Safer, make a clone of buf content in a local
* buffer and give that to receive_msg() to link to msg->buf
*/
int receive_tcp_msg(char* tcpbuf, unsigned int len,
struct receive_info* rcv_info, struct tcp_connection* con)
{
#ifdef TCP_CLONE_RCVBUF
#ifdef DYN_BUF
char *buf = NULL;
#else
static char *buf = NULL;
static unsigned int bsize = 0;
#endif
int blen;
/* cloning is disabled via parameter */
if(likely(tcp_clone_rcvbuf==0)) {
#ifdef READ_MSRP
if(unlikely(con->req.flags&F_TCP_REQ_MSRP_FRAME))
return msrp_process_msg(tcpbuf, len, rcv_info, con);
#endif
#ifdef READ_WS
if(unlikely(con->type == PROTO_WS || con->type == PROTO_WSS))
return ws_process_msg(tcpbuf, len, rcv_info, con);
#endif
return receive_msg(tcpbuf, len, rcv_info);
}
/* min buffer size is BUF_SIZE */
blen = len;
if(blen < BUF_SIZE)
blen = BUF_SIZE;
#ifdef DYN_BUF
buf=pkg_malloc(blen+1);
if (buf==0) {
LM_ERR("could not allocate receive buffer\n");
return -1;
}
#else
/* allocate buffer when needed
* - no buffer yet
* - existing buffer too small (min size is BUF_SIZE - to accomodate most
* of SIP messages; expected larger for HTTP/XCAP)
* - existing buffer too large (e.g., we got a too big message in the past,
* let's free it)
*
* - also, use system memory, not to eat from PKG (same as static buffer
* from PKG pov)
*/
if(buf==NULL || bsize < blen || blen < bsize/2) {
if(buf!=NULL)
free(buf);
buf=malloc(blen+1);
if (buf==0) {
LM_ERR("could not allocate receive buffer\n");
return -1;
}
bsize = blen;
}
#endif
memcpy(buf, tcpbuf, len);
buf[len] = '\0';
#ifdef READ_MSRP
if(unlikely(con->req.flags&F_TCP_REQ_MSRP_FRAME))
return msrp_process_msg(buf, len, rcv_info, con);
#endif
#ifdef READ_WS
if(unlikely(con->type == PROTO_WS || con->type == PROTO_WSS))
return ws_process_msg(buf, len, rcv_info, con);
#endif
return receive_msg(buf, len, rcv_info);
#else /* TCP_CLONE_RCVBUF */
#ifdef READ_MSRP
if(unlikely(con->req.flags&F_TCP_REQ_MSRP_FRAME))
return msrp_process_msg(tcpbuf, len, rcv_info, con);
#endif
#ifdef READ_WS
if(unlikely(con->type == PROTO_WS || con->type == PROTO_WSS))
return ws_process_msg(tcpbuf, len, rcv_info, con);
#endif
return receive_msg(tcpbuf, len, rcv_info);
#endif /* TCP_CLONE_RCVBUF */
}
int tcp_read_req(struct tcp_connection* con, int* bytes_read, int* read_flags)
{
int bytes;
int total_bytes;
int resp;
long size;
struct tcp_req* req;
struct dest_info dst;
char c;
int ret;
bytes=-1;
total_bytes=0;
resp=CONN_RELEASE;
req=&con->req;
again:
if (likely(req->error==TCP_REQ_OK)){
#ifdef READ_WS
if (unlikely(con->type == PROTO_WS || con->type == PROTO_WSS))
bytes=tcp_read_ws(con, read_flags);
else
#endif
bytes=tcp_read_headers(con, read_flags);
if (unlikely(bytes==-1)){
LOG(cfg_get(core, core_cfg, corelog),
"ERROR: tcp_read_req: error reading - c: %p r: %p\n",
con, req);
resp=CONN_ERROR;
goto end_req;
}
#ifdef EXTRA_DEBUG
/* if timeout state=0; goto end__req; */
LM_DBG("read= %d bytes, parsed=%d, state=%d, error=%d\n",
bytes, (int)(req->parsed-req->start), req->state,
req->error );
LM_DBG("last char=0x%02X, parsed msg=\n%.*s\n",
*(req->parsed-1), (int)(req->parsed-req->start),
req->start);
#endif
total_bytes+=bytes;
/* eof check:
* is EOF if eof on fd and req. not complete yet,
* if req. is complete we might have a second unparsed
* request after it, so postpone release_with_eof
*/
if (unlikely((con->state==S_CONN_EOF) &&
(! TCP_REQ_COMPLETE(req)))) {
LM_DBG("EOF\n");
resp=CONN_EOF;
goto end_req;
}
}
if (unlikely(req->error!=TCP_REQ_OK)){
if(req->buf!=NULL && req->start!=NULL && req->pos!=NULL
&& req->pos>=req->buf && req->parsed>=req->start) {
LM_ERR("bad request, state=%d, error=%d buf:\n%.*s\nparsed:\n%.*s\n",
req->state, req->error,
(int)(req->pos-req->buf), req->buf,
(int)(req->parsed-req->start), req->start);
} else {
LM_ERR("bad request, state=%d, error=%d buf:%d - %p,"
" parsed:%d - %p\n",
req->state, req->error,
(int)(req->pos-req->buf), req->buf,
(int)(req->parsed-req->start), req->start);
}
LM_DBG("received from: port %d\n", con->rcv.src_port);
print_ip("received from: ip", &con->rcv.src_ip, "\n");
resp=CONN_ERROR;
goto end_req;
}
if (likely(TCP_REQ_COMPLETE(req))){
#ifdef EXTRA_DEBUG
LM_DBG("end of header part\n");
LM_DBG("received from: port %d\n", con->rcv.src_port);
print_ip("received from: ip", &con->rcv.src_ip, "\n");
LM_DBG("headers:\n%.*s.\n",
(int)(req->body-req->start), req->start);
#endif
if (likely(TCP_REQ_HAS_CLEN(req))){
LM_DBG("content-length=%d\n", req->content_len);
#ifdef EXTRA_DEBUG
LM_DBG("body:\n%.*s\n", req->content_len,req->body);
#endif
}else{
if (cfg_get(tcp, tcp_cfg, accept_no_cl)==0) {
req->error=TCP_REQ_BAD_LEN;
LM_ERR("content length not present or unparsable\n");
resp=CONN_ERROR;
goto end_req;
}
}
/* if we are here everything is nice and ok*/
resp=CONN_RELEASE;
#ifdef EXTRA_DEBUG
LM_DBG("receiving msg(%p, %d)\n",
req->start, (int)(req->parsed-req->start));
#endif
/* rcv.bind_address should always be !=0 */
bind_address=con->rcv.bind_address;
/* just for debugging use sendipv4 as receiving socket FIXME*/
/*
if (con->rcv.dst_ip.af==AF_INET6){
bind_address=sendipv6_tcp;
}else{
bind_address=sendipv4_tcp;
}
*/
con->rcv.proto_reserved1=con->id; /* copy the id */
c=*req->parsed; /* ugly hack: zero term the msg & save the
previous char, req->parsed should be ok
because we always alloc BUF_SIZE+1 */
*req->parsed=0;
if (req->state==H_PING_CRLF) {
init_dst_from_rcv(&dst, &con->rcv);
if (tcp_send(&dst, 0, CRLF, CRLF_LEN) < 0) {
LM_ERR("CRLF ping: tcp_send() failed ([%s]:%u -> [%s]:%u)\n",
ip_addr2a(&con->rcv.src_ip), con->rcv.src_port,
ip_addr2a(&con->rcv.dst_ip), con->rcv.dst_port);
}
ret = 0;
} else if (unlikely(req->state==H_STUN_END)) {
/* stun request */
ret = stun_process_msg(req->start, req->parsed-req->start,
&con->rcv);
} else
#ifdef READ_MSRP
// if (unlikely(req->flags&F_TCP_REQ_MSRP_FRAME)){
if (unlikely(req->state==H_MSRP_FINISH)){
/* msrp frame */
ret = receive_tcp_msg(req->start, req->parsed-req->start,
&con->rcv, con);
}else
#endif
#ifdef READ_HTTP11
if (unlikely(req->state==H_HTTP11_CHUNK_FINISH)){
/* http chunked request */
req->body[req->content_len] = 0;
ret = receive_tcp_msg(req->start,
req->body + req->content_len - req->start,
&con->rcv, con);
}else
#endif
#ifdef READ_WS
if (unlikely(con->type == PROTO_WS || con->type == PROTO_WSS)){
ret = receive_tcp_msg(req->start, req->parsed-req->start,
&con->rcv, con);
}else
#endif
ret = receive_tcp_msg(req->start, req->parsed-req->start,
&con->rcv, con);
if (unlikely(ret < 0)) {
*req->parsed=c;
resp=CONN_ERROR;
goto end_req;
}
*req->parsed=c;
/* prepare for next request */
size=req->pos-req->parsed;
req->start=req->buf;
req->body=0;
req->error=TCP_REQ_OK;
req->state=H_SKIP_EMPTY;
req->flags=0;
req->content_len=0;
req->bytes_to_go=0;
req->pos=req->buf+size;
if (unlikely(size)){
memmove(req->buf, req->parsed, size);
req->parsed=req->buf; /* fix req->parsed after using it */
#ifdef EXTRA_DEBUG
LM_DBG("preparing for new request, kept %ld bytes\n", size);
#endif
/*if we still have some unparsed bytes, try to parse them too*/
goto again;
} else if (unlikely(con->state==S_CONN_EOF)){
LM_DBG("EOF after reading complete request ([%s]:%u -> [%s]:%u)\n",
ip_addr2a(&con->rcv.src_ip), con->rcv.src_port,
ip_addr2a(&con->rcv.dst_ip), con->rcv.dst_port);
resp=CONN_EOF;
}
req->parsed=req->buf; /* fix req->parsed */
}
end_req:
if (likely(bytes_read)) *bytes_read=total_bytes;
return resp;
}
void release_tcpconn(struct tcp_connection* c, long state, int unix_sock)
{
long response[2];
LM_DBG("releasing con %p, state %ld, fd=%d, id=%d ([%s]:%u -> [%s]:%u)\n",
c, state, c->fd, c->id,
ip_addr2a(&c->rcv.src_ip), c->rcv.src_port,
ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port);
LM_DBG("extra_data %p\n", c->extra_data);
/* release req & signal the parent */
c->reader_pid=0; /* reset it */
if (c->fd!=-1){
close(c->fd);
c->fd=-1;
}
/* errno==EINTR, EWOULDBLOCK a.s.o todo */
response[0]=(long)c;
response[1]=state;
if (tsend_stream(unix_sock, (char*)response, sizeof(response), -1)<=0)
LM_ERR("tsend_stream failed\n");
}
static ticks_t tcpconn_read_timeout(ticks_t t, struct timer_ln* tl, void* data)
{
struct tcp_connection *c;
c=(struct tcp_connection*)data;
/* or (struct tcp...*)(tl-offset(c->timer)) */
if (likely(!(c->state<0) && TICKS_LT(t, c->timeout))){
/* timeout extended, exit */
return (ticks_t)(c->timeout - t);
}
/* if conn->state is ERROR or BAD => force timeout too */
if (unlikely(io_watch_del(&io_w, c->fd, -1, IO_FD_CLOSING)<0)){
LM_ERR("io_watch_del failed for %p"
" id %d fd %d, state %d, flags %x, main fd %d"
" ([%s]:%u -> [%s]:%u)\n",
c, c->id, c->fd, c->state, c->flags, c->s,
ip_addr2a(&c->rcv.src_ip), c->rcv.src_port,
ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port);
}
tcpconn_listrm(tcp_conn_lst, c, c_next, c_prev);
release_tcpconn(c, (c->state<0)?CONN_ERROR:CONN_RELEASE, tcpmain_sock);
return 0;
}
/* handle io routine, based on the fd_map type
* (it will be called from io_wait_loop* )
* params: fm - pointer to a fd hash entry
* idx - index in the fd_array (or -1 if not known)
* return: -1 on error, or when we are not interested any more on reads
* from this fd (e.g.: we are closing it )
* 0 on EAGAIN or when by some other way it is known that no more
* io events are queued on the fd (the receive buffer is empty).
* Usefull to detect when there are no more io events queued for
* sigio_rt, epoll_et, kqueue.
* >0 on successfull read from the fd (when there might be more io
* queued -- the receive buffer might still be non-empty)
*/
inline static int handle_io(struct fd_map* fm, short events, int idx)
{
int ret;
int n;
int read_flags;
struct tcp_connection* con;
int s;
long resp;
ticks_t t;
/* update the local config */
cfg_update();
switch(fm->type){
case F_TCPMAIN:
again:
ret=n=receive_fd(fm->fd, &con, sizeof(con), &s, 0);
LM_DBG("received n=%d con=%p, fd=%d\n", n, con, s);
if (unlikely(n<0)){
if (errno == EWOULDBLOCK || errno == EAGAIN){
ret=0;
break;
}else if (errno == EINTR) goto again;
else{
LM_CRIT("read_fd: %s \n", strerror(errno));
abort(); /* big error*/
}
}
if (unlikely(n==0)){
LM_ERR("0 bytes read\n");
goto error;
}
if (unlikely(con==0)){
LM_CRIT("null pointer\n");
goto error;
}
con->fd=s;
if (unlikely(s==-1)) {
LM_ERR("read_fd: no fd read\n");
goto con_error;
}
con->reader_pid=my_pid();
if (unlikely(con==tcp_conn_lst)){
LM_CRIT("duplicate connection received: %p, id %d, fd %d, refcnt %d"
" state %d (n=%d)\n", con, con->id, con->fd,
atomic_get(&con->refcnt), con->state, n);
goto con_error;
break; /* try to recover */
}
if (unlikely(con->state==S_CONN_BAD)){
LM_WARN("received an already bad connection: %p id %d refcnt %d\n",
con, con->id, atomic_get(&con->refcnt));
goto con_error;
}
/* if we received the fd there is most likely data waiting to
* be read => process it first to avoid extra sys calls */
read_flags=((con->flags & (F_CONN_EOF_SEEN|F_CONN_FORCE_EOF)) &&
!(con->flags & F_CONN_OOB_DATA))? RD_CONN_FORCE_EOF
:0;
#ifdef USE_TLS
repeat_1st_read:
#endif /* USE_TLS */
resp=tcp_read_req(con, &n, &read_flags);
if (unlikely(resp<0)){
/* some error occured, but on the new fd, not on the tcp
* main fd, so keep the ret value */
if (unlikely(resp!=CONN_EOF))
con->state=S_CONN_BAD;
release_tcpconn(con, resp, tcpmain_sock);
break;
}
#ifdef USE_TLS
/* repeat read if requested (for now only tls might do this) */
if (unlikely(read_flags & RD_CONN_REPEAT_READ))
goto repeat_1st_read;
#endif /* USE_TLS */
/* must be before io_watch_add, io_watch_add might catch some
* already existing events => might call handle_io and
* handle_io might decide to del. the new connection =>
* must be in the list */
tcpconn_listadd(tcp_conn_lst, con, c_next, c_prev);
t=get_ticks_raw();
con->timeout=t+S_TO_TICKS(TCP_CHILD_TIMEOUT);
/* re-activate the timer */
con->timer.f=tcpconn_read_timeout;
local_timer_reinit(&con->timer);
local_timer_add(&tcp_reader_ltimer, &con->timer,
S_TO_TICKS(TCP_CHILD_TIMEOUT), t);
if (unlikely(io_watch_add(&io_w, s, POLLIN, F_TCPCONN, con)<0)){
LM_CRIT("io_watch_add failed for %p id %d fd %d, state %d, flags %x,"
" main fd %d, refcnt %d ([%s]:%u -> [%s]:%u)\n",
con, con->id, con->fd, con->state, con->flags,
con->s, atomic_get(&con->refcnt),
ip_addr2a(&con->rcv.src_ip), con->rcv.src_port,
ip_addr2a(&con->rcv.dst_ip), con->rcv.dst_port);
tcpconn_listrm(tcp_conn_lst, con, c_next, c_prev);
local_timer_del(&tcp_reader_ltimer, &con->timer);
goto con_error;
}
break;
case F_TCPCONN:
con=(struct tcp_connection*)fm->data;
if (unlikely(con->state==S_CONN_BAD)){
resp=CONN_ERROR;
if (!(con->send_flags.f & SND_F_CON_CLOSE))
LM_WARN("F_TCPCONN connection marked as bad: %p id %d refcnt %d\n",
con, con->id, atomic_get(&con->refcnt));
goto read_error;
}
read_flags=((
#ifdef POLLRDHUP
(events & POLLRDHUP) |
#endif /* POLLRDHUP */
(events & (POLLHUP|POLLERR)) |
(con->flags & (F_CONN_EOF_SEEN|F_CONN_FORCE_EOF)))
&& !(events & POLLPRI))? RD_CONN_FORCE_EOF: 0;
#ifdef USE_TLS
repeat_read:
#endif /* USE_TLS */
resp=tcp_read_req(con, &ret, &read_flags);
if (unlikely(resp<0)){
read_error:
ret=-1; /* some error occured */
if (unlikely(io_watch_del(&io_w, con->fd, idx,
IO_FD_CLOSING) < 0)){
LM_CRIT("io_watch_del failed for %p id %d fd %d,"
" state %d, flags %x, main fd %d, refcnt %d"
" ([%s]:%u -> [%s]:%u)\n",
con, con->id, con->fd, con->state,
con->flags, con->s, atomic_get(&con->refcnt),
ip_addr2a(&con->rcv.src_ip), con->rcv.src_port,
ip_addr2a(&con->rcv.dst_ip), con->rcv.dst_port);
}
tcpconn_listrm(tcp_conn_lst, con, c_next, c_prev);
local_timer_del(&tcp_reader_ltimer, &con->timer);
if (unlikely(resp!=CONN_EOF))
con->state=S_CONN_BAD;
release_tcpconn(con, resp, tcpmain_sock);
}else{
#ifdef USE_TLS
if (unlikely(read_flags & RD_CONN_REPEAT_READ))
goto repeat_read;
#endif /* USE_TLS */
/* update timeout */
con->timeout=get_ticks_raw()+S_TO_TICKS(TCP_CHILD_TIMEOUT);
/* ret= 0 (read the whole socket buffer) if short read &
* !POLLPRI, bytes read otherwise */
ret&=(((read_flags & RD_CONN_SHORT_READ) &&
!(events & POLLPRI)) - 1);
}
break;
case F_NONE:
LM_CRIT("empty fd map %p (%d): {%d, %d, %p}\n",
fm, (int)(fm-io_w.fd_hash),
fm->fd, fm->type, fm->data);
goto error;
default:
LM_CRIT("uknown fd type %d\n", fm->type);
goto error;
}
return ret;
con_error:
con->state=S_CONN_BAD;
release_tcpconn(con, CONN_ERROR, tcpmain_sock);
return ret;
error:
return -1;
}
inline static void tcp_reader_timer_run(void)
{
ticks_t ticks;
ticks=get_ticks_raw();
if (unlikely((ticks-tcp_reader_prev_ticks)<TCPCONN_TIMEOUT_MIN_RUN))
return;
tcp_reader_prev_ticks=ticks;
local_timer_run(&tcp_reader_ltimer, ticks);
}
void tcp_receive_loop(int unix_sock)
{
/* init */
tcpmain_sock=unix_sock; /* init com. socket */
if (init_io_wait(&io_w, get_max_open_fds(), tcp_poll_method)<0)
goto error;
tcp_reader_prev_ticks=get_ticks_raw();
if (init_local_timer(&tcp_reader_ltimer, get_ticks_raw())!=0)
goto error;
/* add the unix socket */
if (io_watch_add(&io_w, tcpmain_sock, POLLIN, F_TCPMAIN, 0)<0){
LM_CRIT("failed to add tcp main socket to the fd list\n");
goto error;
}
/* initialize the config framework */
if (cfg_child_init()) goto error;
/* main loop */
switch(io_w.poll_method){
case POLL_POLL:
while(1){
io_wait_loop_poll(&io_w, TCP_CHILD_SELECT_TIMEOUT, 0);
tcp_reader_timer_run();
}
break;
#ifdef HAVE_SELECT
case POLL_SELECT:
while(1){
io_wait_loop_select(&io_w, TCP_CHILD_SELECT_TIMEOUT, 0);
tcp_reader_timer_run();
}
break;
#endif
#ifdef HAVE_SIGIO_RT
case POLL_SIGIO_RT:
while(1){
io_wait_loop_sigio_rt(&io_w, TCP_CHILD_SELECT_TIMEOUT);
tcp_reader_timer_run();
}
break;
#endif
#ifdef HAVE_EPOLL
case POLL_EPOLL_LT:
while(1){
io_wait_loop_epoll(&io_w, TCP_CHILD_SELECT_TIMEOUT, 0);
tcp_reader_timer_run();
}
break;
case POLL_EPOLL_ET:
while(1){
io_wait_loop_epoll(&io_w, TCP_CHILD_SELECT_TIMEOUT, 1);
tcp_reader_timer_run();
}
break;
#endif
#ifdef HAVE_KQUEUE
case POLL_KQUEUE:
while(1){
io_wait_loop_kqueue(&io_w, TCP_CHILD_SELECT_TIMEOUT, 0);
tcp_reader_timer_run();
}
break;
#endif
#ifdef HAVE_DEVPOLL
case POLL_DEVPOLL:
while(1){
io_wait_loop_devpoll(&io_w, TCP_CHILD_SELECT_TIMEOUT, 0);
tcp_reader_timer_run();
}
break;
#endif
default:
LM_CRIT("no support for poll method %s (%d)\n",
poll_method_name(io_w.poll_method), io_w.poll_method);
goto error;
}
error:
destroy_io_wait(&io_w);
LM_CRIT("exiting...");
exit(-1);
}
int is_msg_complete(struct tcp_req* r)
{
if (TCP_REQ_HAS_CLEN(r)) {
r->state = H_STUN_FP;
return 0;
}
else {
/* STUN message is complete */
r->state = H_STUN_END;
r->flags |= F_TCP_REQ_COMPLETE |
F_TCP_REQ_HAS_CLEN; /* hack to avoid error check */
return 1;
}
}
#endif /* USE_TCP */
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