path: root/camel/camel-tcp-stream-raw.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 *  This program 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.
 *
 *  This program 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., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "camel-tcp-stream-raw.h"
#include "camel-operation.h"

static CamelTcpStreamClass *parent_class = NULL;

/* Returns the class for a CamelTcpStreamRaw */
#define CTSR_CLASS(so) CAMEL_TCP_STREAM_RAW_CLASS (CAMEL_OBJECT_GET_CLASS (so))

static ssize_t stream_read (CamelStream *stream, char *buffer, size_t n);
static ssize_t stream_write (CamelStream *stream, const char *buffer, size_t n);
static int stream_flush  (CamelStream *stream);
static int stream_close  (CamelStream *stream);

static int stream_connect (CamelTcpStream *stream, struct hostent *host, int port);
static int stream_getsockopt (CamelTcpStream *stream, CamelSockOptData *data);
static int stream_setsockopt (CamelTcpStream *stream, const CamelSockOptData *data);
static gpointer stream_get_socket (CamelTcpStream *stream);

static void
camel_tcp_stream_raw_class_init (CamelTcpStreamRawClass *camel_tcp_stream_raw_class)
{
    CamelTcpStreamClass *camel_tcp_stream_class =
        CAMEL_TCP_STREAM_CLASS (camel_tcp_stream_raw_class);
    CamelStreamClass *camel_stream_class =
        CAMEL_STREAM_CLASS (camel_tcp_stream_raw_class);
    
    parent_class = CAMEL_TCP_STREAM_CLASS (camel_type_get_global_classfuncs (camel_tcp_stream_get_type ()));
    
    /* virtual method overload */
    camel_stream_class->read = stream_read;
    camel_stream_class->write = stream_write;
    camel_stream_class->flush = stream_flush;
    camel_stream_class->close = stream_close;
    
    camel_tcp_stream_class->connect = stream_connect;
    camel_tcp_stream_class->getsockopt = stream_getsockopt;
    camel_tcp_stream_class->setsockopt = stream_setsockopt;
    camel_tcp_stream_class->get_socket = stream_get_socket;
}

static void
camel_tcp_stream_raw_init (gpointer object, gpointer klass)
{
    CamelTcpStreamRaw *stream = CAMEL_TCP_STREAM_RAW (object);
    
    stream->sockfd = -1;
}

static void
camel_tcp_stream_raw_finalize (CamelObject *object)
{
    CamelTcpStreamRaw *stream = CAMEL_TCP_STREAM_RAW (object);
    
    if (stream->sockfd != -1)
        close (stream->sockfd);
}


CamelType
camel_tcp_stream_raw_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_tcp_stream_get_type (),
                        "CamelTcpStreamRaw",
                        sizeof (CamelTcpStreamRaw),
                        sizeof (CamelTcpStreamRawClass),
                        (CamelObjectClassInitFunc) camel_tcp_stream_raw_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_tcp_stream_raw_init,
                        (CamelObjectFinalizeFunc) camel_tcp_stream_raw_finalize);
    }
    
    return type;
}

#ifdef SIMULATE_FLAKY_NETWORK
static ssize_t
tcp_write (int fd, const char *buffer, size_t buflen)
{
    size_t len = buflen;
    ssize_t nwritten;
    int val;
    
    if (buflen == 0)
        return 0;
    
    val = 1 + (int) (10.0 * rand () / (RAND_MAX + 1.0));
    
    switch (val) {
    case 1:
        printf ("tcp_write (%d, ..., %d): (-1) EINTR\n", fd, buflen);
        errno = EINTR;
        return -1;
#if 0
        /* seems that if we set errno to either EAGAIN or
                   EWOULDBLOCK, libc's pthread crashes...wacky */
    case 2:
        printf ("tcp_write (%d, ..., %d): (-1) EAGAIN\n", fd, buflen);
        errno = EAGAIN;
        return -1;
    case 3:
        printf ("tcp_write (%d, ..., %d): (-1) EWOULDBLOCK\n", fd, buflen);
        errno = EWOULDBLOCK;
        return -1;
#endif
    case 4:
    case 5:
    case 6:
        len = 1 + (size_t) (buflen * rand () / (RAND_MAX + 1.0));
        len = MIN (len, buflen);
        /* fall through... */
    default:
        printf ("tcp_write (%d, ..., %d): (%d) '%.*s'", fd, buflen, len, (int) len, buffer);
        nwritten = write (fd, buffer, len);
        if (nwritten < 0)
            printf (" errno => %s\n", g_strerror (errno));
        else if (nwritten < len)
            printf (" only wrote %d bytes\n", nwritten);
        else
            printf ("\n");
        
        return nwritten;
    }
}

#define write(fd, buffer, buflen) tcp_write (fd, buffer, buflen)

#endif /* SIMULATE_FLAKY_NETWORK */



/**
 * camel_tcp_stream_raw_new:
 *
 * Return value: a tcp stream
 **/
CamelStream *
camel_tcp_stream_raw_new ()
{
    CamelTcpStreamRaw *stream;
    
    stream = CAMEL_TCP_STREAM_RAW (camel_object_new (camel_tcp_stream_raw_get_type ()));
    
    return CAMEL_STREAM (stream);
}

static ssize_t
stream_read (CamelStream *stream, char *buffer, size_t n)
{
    CamelTcpStreamRaw *tcp_stream_raw = CAMEL_TCP_STREAM_RAW (stream);
    ssize_t nread;
    int cancel_fd;
    
    if (camel_operation_cancel_check (NULL)) {
        errno = EINTR;
        return  -1;
    }
    
    cancel_fd = camel_operation_cancel_fd (NULL);
    if (cancel_fd == -1) {
        do {
            nread = read (tcp_stream_raw->sockfd, buffer, n);
        } while (nread == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
    } else {
        int error, flags, fdmax;
        fd_set rdset;
        
        flags = fcntl (tcp_stream_raw->sockfd, F_GETFL);
        fcntl (tcp_stream_raw->sockfd, F_SETFL, flags | O_NONBLOCK);
        
        do {
            FD_ZERO (&rdset);
            FD_SET (tcp_stream_raw->sockfd, &rdset);
            FD_SET (cancel_fd, &rdset);
            fdmax = MAX (tcp_stream_raw->sockfd, cancel_fd) + 1;
            
            select (fdmax, &rdset, 0, 0, NULL);
            if (FD_ISSET (cancel_fd, &rdset)) {
                fcntl (tcp_stream_raw->sockfd, F_SETFL, flags);
                errno = EINTR;
                return -1;
            }
            
            do {
                nread = read (tcp_stream_raw->sockfd, buffer, n);
            } while (nread == -1 && errno == EINTR);
        } while (nread == -1 && (errno == EAGAIN || errno == EWOULDBLOCK));
        
        error = errno;
        fcntl (tcp_stream_raw->sockfd, F_SETFL, flags);
        errno = error;
    }
    
    return nread;
}

static ssize_t
stream_write (CamelStream *stream, const char *buffer, size_t n)
{
    CamelTcpStreamRaw *tcp_stream_raw = CAMEL_TCP_STREAM_RAW (stream);
    ssize_t w, written = 0;
    int cancel_fd;
    
    if (camel_operation_cancel_check (NULL)) {
        errno = EINTR;
        return -1;
    }
    
    cancel_fd = camel_operation_cancel_fd (NULL);
    if (cancel_fd == -1) {
        do {
            do {
                w = write (tcp_stream_raw->sockfd, buffer + written, n - written);
            } while (w == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
            
            if (w > 0)
                written += w;
        } while (w != -1 && written < n);
    } else {
        int error, flags, fdmax;
        fd_set rdset, wrset;
        
        flags = fcntl (tcp_stream_raw->sockfd, F_GETFL);
        fcntl (tcp_stream_raw->sockfd, F_SETFL, flags | O_NONBLOCK);
        
        fdmax = MAX (tcp_stream_raw->sockfd, cancel_fd) + 1;
        do {
            FD_ZERO (&rdset);
            FD_ZERO (&wrset);
            FD_SET (tcp_stream_raw->sockfd, &wrset);
            FD_SET (cancel_fd, &rdset);
            
            select (fdmax, &rdset, &wrset, 0, NULL);
            if (FD_ISSET (cancel_fd, &rdset)) {
                fcntl (tcp_stream_raw->sockfd, F_SETFL, flags);
                errno = EINTR;
                return -1;
            }
            
            do {
                w = write (tcp_stream_raw->sockfd, buffer + written, n - written);
            } while (w == -1 && errno == EINTR);
            
            if (w == -1) {
                if (errno == EAGAIN || errno == EWOULDBLOCK)
                    continue;
            } else
                written += w;
        } while (w != -1 && written < n);
        
        error = errno;
        fcntl (tcp_stream_raw->sockfd, F_SETFL, flags);
        errno = error;
    }
    
    return written;
}

static int
stream_flush (CamelStream *stream)
{
    return fsync (((CamelTcpStreamRaw *)stream)->sockfd);
}

static int
stream_close (CamelStream *stream)
{
    if (close (((CamelTcpStreamRaw *)stream)->sockfd) == -1)
        return -1;
    
    ((CamelTcpStreamRaw *)stream)->sockfd = -1;
    return 0;
}

/* this is a 'cancellable' connect, cancellable from camel_operation_cancel etc */
/* returns -1 & errno == EINTR if the connection was cancelled */
static int
socket_connect (struct hostent *h, int port)
{
    struct sockaddr_in sin;
    int fd;
    int ret;
    socklen_t len;
    struct timeval tv;
    int cancel_fd;
    
    /* see if we're cancelled yet */
    if (camel_operation_cancel_check (NULL)) {
        errno = EINTR;
        return -1;
    }
    
    /* setup connect, we do it using a nonblocking socket so we can poll it */
    sin.sin_port = htons (port);
    sin.sin_family = h->h_addrtype;
    memcpy (&sin.sin_addr, h->h_addr, sizeof (sin.sin_addr));
    
    fd = socket (h->h_addrtype, SOCK_STREAM, 0);
    
    cancel_fd = camel_operation_cancel_fd (NULL);
    if (cancel_fd == -1) {
        ret = connect (fd, (struct sockaddr *)&sin, sizeof (sin));
        if (ret == -1) {
            close (fd);
            return -1;
        }
        
        return fd;
    } else {
        fd_set rdset, wrset;
        int flags, fdmax;
        
        flags = fcntl (fd, F_GETFL);
        fcntl (fd, F_SETFL, flags | O_NONBLOCK);
        
        ret = connect (fd, (struct sockaddr *)&sin, sizeof (sin));
        if (ret == 0) {
            fcntl (fd, F_SETFL, flags);
            return fd;
        }
        
        if (errno != EINPROGRESS) {
            close (fd);
            return -1;
        }
        
        FD_ZERO (&rdset);
        FD_ZERO (&wrset);
        FD_SET (fd, &wrset);
        FD_SET (cancel_fd, &rdset);
        fdmax = MAX (fd, cancel_fd) + 1;
        tv.tv_usec = 0;
        tv.tv_sec = 60 * 4;
        
        if (select (fdmax, &rdset, &wrset, 0, &tv) == 0) {
            close (fd);
            errno = ETIMEDOUT;
            return -1;
        }
        
        if (cancel_fd != -1 && FD_ISSET (cancel_fd, &rdset)) {
            close (fd);
            errno = EINTR;
            return -1;
        } else {
            len = sizeof (int);
            
            if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &len) == -1) {
                close (fd);
                return -1;
            }
            
            if (ret != 0) {
                close (fd);
                errno = ret;
                return -1;
            }
        }
        
        fcntl (fd, F_SETFL, flags);
    }
    
    return fd;
}

static int
stream_connect (CamelTcpStream *stream, struct hostent *host, int port)
{
    CamelTcpStreamRaw *raw = CAMEL_TCP_STREAM_RAW (stream);
    int fd;
    
    g_return_val_if_fail (host != NULL, -1);
    
    fd = socket_connect (host, port);
    if (fd == -1)
        return -1;
    
    raw->sockfd = fd;
    
    return 0;
}


static int
get_sockopt_level (const CamelSockOptData *data)
{
    switch (data->option) {
    case CAMEL_SOCKOPT_MAXSEGMENT:
    case CAMEL_SOCKOPT_NODELAY:
        return IPPROTO_TCP;
    default:
        return SOL_SOCKET;
    }
}

static int
get_sockopt_optname (const CamelSockOptData *data)
{
    switch (data->option) {
    case CAMEL_SOCKOPT_MAXSEGMENT:
        return TCP_MAXSEG;
    case CAMEL_SOCKOPT_NODELAY:
        return TCP_NODELAY;
    case CAMEL_SOCKOPT_BROADCAST:
        return SO_BROADCAST;
    case CAMEL_SOCKOPT_KEEPALIVE:
        return SO_KEEPALIVE;
    case CAMEL_SOCKOPT_LINGER:
        return SO_LINGER;
    case CAMEL_SOCKOPT_RECVBUFFERSIZE:
        return SO_RCVBUF;
    case CAMEL_SOCKOPT_SENDBUFFERSIZE:
        return SO_SNDBUF;
    case CAMEL_SOCKOPT_REUSEADDR:
        return SO_REUSEADDR;
    case CAMEL_SOCKOPT_IPTYPEOFSERVICE:
        return SO_TYPE;
    default:
        return -1;
    }
}

static int
stream_getsockopt (CamelTcpStream *stream, CamelSockOptData *data)
{
    int optname, optlen;
    
    if ((optname = get_sockopt_optname (data)) == -1)
        return -1;
    
    if (data->option == CAMEL_SOCKOPT_NONBLOCKING) {
        int flags;
        
        flags = fcntl (((CamelTcpStreamRaw *)stream)->sockfd, F_GETFL);
        if (flags == -1)
            return -1;
        
        data->value.non_blocking = flags & O_NONBLOCK;
        
        return 0;
    }
    
    return getsockopt (((CamelTcpStreamRaw *)stream)->sockfd,
               get_sockopt_level (data),
               optname,
               (void *) &data->value,
               &optlen);
}

static int
stream_setsockopt (CamelTcpStream *stream, const CamelSockOptData *data)
{
    int optname;
    
    if ((optname = get_sockopt_optname (data)) == -1)
        return -1;
    
    if (data->option == CAMEL_SOCKOPT_NONBLOCKING) {
        int flags, set;
        
        flags = fcntl (((CamelTcpStreamRaw *)stream)->sockfd, F_GETFL);
        if (flags == -1)
            return -1;
        
        set = data->value.non_blocking ? 1 : 0;
        flags = (flags & ~O_NONBLOCK) | (set & O_NONBLOCK);
        
        if (fcntl (((CamelTcpStreamRaw *)stream)->sockfd, F_SETFL, flags) == -1)
            return -1;
        
        return 0;
    }
    
    return setsockopt (((CamelTcpStreamRaw *)stream)->sockfd,
               get_sockopt_level (data),
               optname,
               (void *) &data->value,
               sizeof (data->value));
}

static gpointer
stream_get_socket (CamelTcpStream *stream)
{
    return GINT_TO_POINTER (CAMEL_TCP_STREAM_RAW (stream)->sockfd);
}