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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
*/
/*!
* \file
* \brief Kamailio core ::
* \ingroup core
* Module: \ref core
*/
#ifdef USE_TCP
#include "pass_fd.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stdlib.h> /* for NULL definition on openbsd */
#include <errno.h>
#include <string.h>
#ifdef NO_MSG_WAITALL
#include <poll.h>
#endif /* NO_MSG_WAITALL */
#include "dprint.h"
/** receive all the data or returns error (handles EINTR etc.)
* params: socket
* data - buffer for the results
* data_len -
* flags - recv flags for the first recv (see recv(2)), only
* 0, MSG_WAITALL and MSG_DONTWAIT make sense
* if flags is set to MSG_DONWAIT (or to 0 and the socket fd is non-blocking),
* and if no data is queued on the fd, recv_all will not wait (it will
* return error and set errno to EAGAIN/EWOULDBLOCK). However if even 1 byte
* is queued, the call will block until the whole data_len was read or an
* error or eof occured ("semi-nonblocking" behaviour, some tcp code
* counts on it).
* if flags is set to MSG_WAITALL it will block even if no byte is available.
*
* returns: bytes read or error (<0)
* can return < data_len if EOF */
int recv_all(int socket, void* data, int data_len, int flags)
{
int b_read;
int n;
#ifdef NO_MSG_WAITALL
struct pollfd pfd;
#endif /* NO_MSG_WAITALL */
b_read=0;
again:
#ifdef NO_MSG_WAITALL
if (flags & MSG_WAITALL){
n=-1;
goto poll_recv; /* simulate MSG_WAITALL */
}
#endif /* NO_MSG_WAITALL */
n=recv(socket, (char*)data, data_len, flags);
if (n<0){
/* error */
if (errno==EINTR) goto again; /* signal, try again */
/* on EAGAIN just return (let the caller know) */
if ((errno==EAGAIN)||(errno==EWOULDBLOCK)) return n;
LM_CRIT("1st recv on %d failed: %s\n",
socket, strerror(errno));
return n;
}
b_read+=n;
while( (b_read!=data_len) && (n)){
#ifdef NO_MSG_WAITALL
/* cygwin & win do not support MSG_WAITALL => workaround using poll */
poll_recv:
n=recv(socket, (char*)data+b_read, data_len-b_read, 0);
#else /* NO_MSG_WAITALL */
n=recv(socket, (char*)data+b_read, data_len-b_read, MSG_WAITALL);
#endif /* NO_MSG_WAITALL */
if (n<0){
/* error */
if (errno==EINTR) continue; /* signal, try again */
#ifdef NO_MSG_WAITALL
if (errno==EAGAIN || errno==EWOULDBLOCK){
/* emulate MSG_WAITALL using poll */
pfd.fd=socket;
pfd.events=POLLIN;
poll_retry:
n=poll(&pfd, 1, -1);
if (n<0){
if (errno==EINTR) goto poll_retry;
LM_CRIT("poll on %d failed: %s\n",
socket, strerror(errno));
return n;
} else continue; /* try recv again */
}
#endif /* NO_MSG_WAITALL */
LM_CRIT("2nd recv on %d failed: %s\n",
socket, strerror(errno));
return n;
}
b_read+=n;
}
return b_read;
}
/** sends all data (takes care of signals) (assumes blocking fd)
* returns number of bytes sent or < 0 for an error */
int send_all(int socket, void* data, int data_len)
{
int n;
again:
n=send(socket, data, data_len, 0);
if (n<0){
/* error */
if (errno==EINTR) goto again; /* signal, try again */
if ((errno!=EAGAIN) &&(errno!=EWOULDBLOCK))
LM_CRIT("send on %d failed: %s\n",
socket, strerror(errno));
}
return n;
}
/** at least 1 byte must be sent! */
int send_fd(int unix_socket, void* data, int data_len, int fd)
{
struct msghdr msg;
struct iovec iov[1];
int ret;
#ifdef HAVE_MSGHDR_MSG_CONTROL
int* pi;
struct cmsghdr* cmsg;
/* make sure msg_control will point to properly aligned data */
union {
struct cmsghdr cm;
char control[CMSG_SPACE(sizeof(fd))];
}control_un;
memset(&msg, 0, sizeof(struct msghdr));
msg.msg_control=control_un.control;
/* openbsd doesn't like "more space", msg_controllen must not
* include the end padding */
msg.msg_controllen=CMSG_LEN(sizeof(fd));
cmsg=CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
pi=(int*)CMSG_DATA(cmsg);
*pi=fd;
msg.msg_flags=0;
#else
msg.msg_accrights=(caddr_t) &fd;
msg.msg_accrightslen=sizeof(fd);
#endif
msg.msg_name=0;
msg.msg_namelen=0;
iov[0].iov_base=data;
iov[0].iov_len=data_len;
msg.msg_iov=iov;
msg.msg_iovlen=1;
again:
ret=sendmsg(unix_socket, &msg, 0);
if (ret<0){
if (errno==EINTR) goto again;
if ((errno!=EAGAIN) && (errno!=EWOULDBLOCK))
LM_CRIT("sendmsg failed sending %d on %d: %s (%d)\n",
fd, unix_socket, strerror(errno), errno);
}
return ret;
}
/** receives a fd and data_len data
* params: unix_socket
* data
* data_len
* fd - will be set to the passed fd value or -1 if no fd
* was passed
* flags - 0, MSG_DONTWAIT, MSG_WAITALL; same as recv_all flags
* returns: bytes read on success, -1 on error (and sets errno) */
int receive_fd(int unix_socket, void* data, int data_len, int* fd, int flags)
{
struct msghdr msg;
struct iovec iov[1];
int new_fd;
int ret;
int n;
#ifdef NO_MSG_WAITALL
struct pollfd pfd;
int f;
#endif /*NO_MSG_WAITALL */
#ifdef HAVE_MSGHDR_MSG_CONTROL
int* pi;
struct cmsghdr* cmsg;
union{
struct cmsghdr cm;
char control[CMSG_SPACE(sizeof(new_fd))];
}control_un;
memset(&msg, 0, sizeof(struct msghdr));
msg.msg_control=control_un.control;
msg.msg_controllen=sizeof(control_un.control);
#else
msg.msg_accrights=(caddr_t) &new_fd;
msg.msg_accrightslen=sizeof(int);
#endif
msg.msg_name=0;
msg.msg_namelen=0;
iov[0].iov_base=data;
iov[0].iov_len=data_len;
msg.msg_iov=iov;
msg.msg_iovlen=1;
#ifdef NO_MSG_WAITALL
f=flags & ~MSG_WAITALL;
#endif /* NO_MSG_WAITALL */
again:
#ifdef NO_MSG_WAITALL
ret=recvmsg(unix_socket, &msg, f);
#else /* NO_MSG_WAITALL */
ret=recvmsg(unix_socket, &msg, flags);
#endif /* NO_MSG_WAITALL */
if (ret<0){
if (errno==EINTR) goto again;
if ((errno==EAGAIN)||(errno==EWOULDBLOCK)){
#ifdef NO_MSG_WAITALL
if (flags & MSG_WAITALL){
/* emulate MSG_WAITALL using poll */
pfd.fd=unix_socket;
pfd.events=POLLIN;
poll_again:
ret=poll(&pfd, 1, -1);
if (ret>=0) goto again;
else if (errno==EINTR) goto poll_again;
LM_CRIT("poll on %d failed: %s\n",
unix_socket, strerror(errno));
}
#endif /* NO_MSG_WAITALL */
goto error;
}
LM_CRIT("recvmsg on %d failed: %s\n",
unix_socket, strerror(errno));
goto error;
}
if (ret==0){
/* EOF */
LM_CRIT("EOF on %d\n", unix_socket);
goto error;
}
if (ret<data_len){
LM_WARN("too few bytes read (%d from %d) trying to fix...\n",
ret, data_len);
/* blocking recv_all */
n=recv_all(unix_socket, (char*)data+ret, data_len-ret, MSG_WAITALL);
if (n>=0) ret+=n;
else{
ret=n;
goto error;
}
}
#ifdef HAVE_MSGHDR_MSG_CONTROL
cmsg=CMSG_FIRSTHDR(&msg);
if ((cmsg!=0) && (cmsg->cmsg_len==CMSG_LEN(sizeof(new_fd)))){
if (cmsg->cmsg_type!= SCM_RIGHTS){
LM_ERR("msg control type != SCM_RIGHTS\n");
ret=-1;
goto error;
}
if (cmsg->cmsg_level!= SOL_SOCKET){
LM_ERR("msg level != SOL_SOCKET\n");
ret=-1;
goto error;
}
pi=(int*) CMSG_DATA(cmsg);
*fd=*pi;
}else{
/*LM_ERR("no descriptor passed, cmsg=%p, len=%d\n",
cmsg, (unsigned)cmsg->cmsg_len); */
*fd=-1;
/* it's not really an error */
}
#else
if (msg.msg_accrightslen==sizeof(int)){
*fd=new_fd;
}else{
/*LM_ERR("no descriptor passed, accrightslen=%d\n",
msg.msg_accrightslen); */
*fd=-1;
}
#endif
error:
return ret;
}
#endif
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