/
socket.c
1582 lines (1301 loc) · 33.9 KB
/
socket.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2014 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "socket.h"
#include <sys/types.h>
#ifdef HAVE_NETINET_TCP_H
# include <netinet/tcp.h>
#endif
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h> /* defines FIONBIO and FIONREAD */
#endif
#ifdef HAVE_SYS_SOCKIO_H
# include <sys/sockio.h> /* defines SIOCATMARK */
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
# include <time.h>
#endif
/* sendfile() function related includes
*/
#if defined(LINUX_SENDFILE_API)
# include <sys/sendfile.h>
#elif defined(SOLARIS_SENDFILE_API)
# include <sys/sendfile.h>
#elif defined(HPUX_SENDFILE_API)
# include <sys/socket.h>
#elif defined(FREEBSD_SENDFILE_API)
# include <sys/types.h>
# include <sys/socket.h>
#elif defined(LINUX_BROKEN_SENDFILE_API)
extern int32_t sendfile (int out_fd, int in_fd, int32_t *offset, uint32_t count);
#endif
#ifdef HAVE_SYS_UIO_H
# include <sys/uio.h> /* sendfile and writev() */
#endif
#define ENTRIES "socket"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "util.h"
#include "buffer.h"
#include "server-protected.h"
#include "virtual_server.h"
#include "resolv_cache.h"
/* Max. sendfile block size (bytes), limiting size of data sent by
* each sendfile call may: improve responsiveness, reduce memory
* pressure, prevent blocking calls, etc.
*
* NOTE: try to reduce block size (down to 64 KB) on small or old
* systems and see if something improves under heavy load.
*/
#define MAX_SF_BLK_SIZE (65536 * 16) /* limit size of block size */
#define MAX_SF_BLK_SIZE2 (MAX_SF_BLK_SIZE + 65536) /* upper limit */
ret_t
cherokee_socket_init (cherokee_socket_t *socket)
{
memset (&socket->client_addr, 0, sizeof(cherokee_sockaddr_t));
socket->client_addr_len = -1;
socket->socket = -1;
socket->status = socket_closed;
socket->is_tls = non_TLS;
socket->cryptor = NULL;
return ret_ok;
}
ret_t
cherokee_socket_mrproper (cherokee_socket_t *socket)
{
if (socket->cryptor != NULL) {
cherokee_cryptor_socket_free (socket->cryptor);
socket->cryptor = NULL;
}
return ret_ok;
}
ret_t
cherokee_socket_clean (cherokee_socket_t *socket)
{
/* TLS
*/
if (socket->cryptor != NULL) {
cherokee_cryptor_socket_free (socket->cryptor);
socket->cryptor = NULL;
}
socket->is_tls = non_TLS;
/* Properties
*/
socket->socket = -1;
socket->status = socket_closed;
/* Client address
*/
socket->client_addr_len = -1;
memset (&socket->client_addr, 0, sizeof(cherokee_sockaddr_t));
return ret_ok;
}
ret_t
cherokee_socket_init_tls (cherokee_socket_t *socket,
cherokee_virtual_server_t *vserver,
cherokee_connection_t *conn,
cherokee_socket_status_t *blocking)
{
ret_t ret;
cherokee_server_t *srv = VSERVER_SRV(vserver);
if (socket->cryptor == NULL) {
ret = cherokee_cryptor_socket_new (srv->cryptor, &socket->cryptor);
if (ret != ret_ok)
return ret;
}
ret = cherokee_cryptor_socket_init_tls (socket->cryptor, socket, vserver, conn, blocking);
if (ret != ret_ok) {
return ret;
}
socket->is_tls = TLS;
return ret_ok;
}
ret_t
cherokee_socket_close (cherokee_socket_t *socket)
{
ret_t ret;
/* Sanity check
*/
if (socket->socket < 0) {
return ret_error;
}
/* Close the socket
*/
#ifdef _WIN32
ret = closesocket (socket->socket);
#else
ret = cherokee_fd_close (socket->socket);
#endif
/* Clean up
*/
TRACE (ENTRIES",close", "fd=%d is_tls=%d re=%d\n",
socket->socket, socket->is_tls, (int) ret);
socket->socket = -1;
socket->status = socket_closed;
socket->is_tls = non_TLS;
return ret;
}
ret_t
cherokee_socket_shutdown (cherokee_socket_t *socket, int how)
{
int re;
if (unlikely (socket->socket < 0)) {
return ret_error;
}
/* Shutdown the socket
*/
do {
re = shutdown (socket->socket, how);
} while ((re == -1) && (errno == EINTR));
if (unlikely (re != 0)) {
switch (errno) {
case ENOTCONN:
break;
default:
TRACE (ENTRIES, "shutdown(%d, %d) = %s\n", socket->socket, how, strerror(errno));
return ret_error;
}
}
return ret_ok;
}
ret_t
cherokee_socket_reset (cherokee_socket_t *socket)
{
int re;
struct linger linger;
if (unlikely (socket->socket < 0)) {
return ret_error;
}
linger.l_onoff = 1;
linger.l_linger = 0;
re = setsockopt (socket->socket, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
if (re == -1) {
LOG_ERRNO (errno, cherokee_err_warning,
CHEROKEE_ERROR_SOCKET_SET_LINGER, socket->socket);
return ret_error;
}
return ret_ok;
}
ret_t
cherokee_socket_ntop (cherokee_socket_t *socket, char *dst, size_t cnt)
{
if (unlikely (SOCKET_FD(socket) < 0)) {
return ret_error;
}
return cherokee_ntop (SOCKET_AF(socket),
(struct sockaddr *) &SOCKET_ADDR(socket),
dst, cnt);
}
ret_t
cherokee_socket_pton (cherokee_socket_t *socket, cherokee_buffer_t *host)
{
int re;
switch (SOCKET_AF(socket)) {
case AF_INET:
#ifdef HAVE_INET_PTON
re = inet_pton (AF_INET, host->buf, &SOCKET_SIN_ADDR(socket));
if (re <= 0) return ret_error;
#else
re = inet_aton (host->buf, &SOCKET_SIN_ADDR(socket));
if (re == 0) return ret_error;
#endif
break;
#ifdef HAVE_IPV6
case AF_INET6:
re = inet_pton (AF_INET6, host->buf, &SOCKET_SIN6_ADDR(socket));
if (re <= 0) return ret_error;
break;
#endif
default:
LOG_CRITICAL (CHEROKEE_ERROR_SOCKET_BAD_FAMILY, SOCKET_AF(socket));
return ret_error;
}
return ret_ok;
}
ret_t
cherokee_socket_accept (cherokee_socket_t *socket, cherokee_socket_t *server_socket)
{
ret_t ret;
int fd;
cherokee_sockaddr_t sa;
ret = cherokee_socket_accept_fd (server_socket, &fd, &sa);
if (unlikely(ret < ret_ok))
return ret;
ret = cherokee_socket_set_sockaddr (socket, fd, &sa);
if (unlikely(ret < ret_ok)) {
cherokee_fd_close (fd);
SOCKET_FD(socket) = -1;
return ret;
}
return ret_ok;
}
ret_t
cherokee_socket_set_sockaddr (cherokee_socket_t *socket, int fd, cherokee_sockaddr_t *sa)
{
/* Copy the client address
*/
switch (sa->sa.sa_family) {
case AF_INET:
socket->client_addr_len = sizeof(struct sockaddr_in);
break;
#ifdef HAVE_IPV6
case AF_INET6:
socket->client_addr_len = sizeof(struct sockaddr_in6);
break;
#endif
default:
SHOULDNT_HAPPEN;
return ret_error;
}
memcpy (&socket->client_addr, sa, socket->client_addr_len);
/* Status is no more closed.
*/
socket->status = socket_reading;
SOCKET_FD(socket) = fd;
return ret_ok;
}
ret_t
cherokee_socket_update_from_addrinfo (cherokee_socket_t *socket,
const struct addrinfo *addr,
cuint_t num)
{
const struct addrinfo *ai;
if (unlikely (addr == NULL))
return ret_error;
/* Find the right address
*/
ai = addr;
while (num > 0) {
num -= 1;
ai = ai->ai_next;
if (ai == NULL) {
return ret_not_found;
}
}
/* Copy the information
*/
SOCKET_AF(socket) = addr->ai_family;
socket->client_addr_len = addr->ai_addrlen;
switch (addr->ai_family) {
case AF_INET:
memcpy (&SOCKET_SIN_ADDR(socket), &((struct sockaddr_in *) ai->ai_addr)->sin_addr, sizeof(struct in_addr));
break;
case AF_INET6:
memcpy (&SOCKET_SIN6_ADDR(socket), &((struct sockaddr_in6 *) ai->ai_addr)->sin6_addr, sizeof(struct in6_addr));
break;
default:
SHOULDNT_HAPPEN;
return ret_error;
}
return ret_ok;
}
ret_t
cherokee_socket_accept_fd (cherokee_socket_t *server_socket,
int *new_fd,
cherokee_sockaddr_t *sa)
{
ret_t ret;
socklen_t len;
int new_socket;
/* Get the new connection
*/
len = sizeof (cherokee_sockaddr_t);
do {
new_socket = accept (server_socket->socket, &sa->sa, &len);
} while ((new_socket == -1) && (errno == EINTR));
if (new_socket < 0) {
return ret_error;
}
/* It'd nice to be able to reuse the address even if the
* socket is still in TIME_WAIT statue (2*RTT ~ 120 seg)
*/
cherokee_fd_set_reuseaddr (new_socket);
/* Close-on-exec: Child processes won't inherit this fd
*/
cherokee_fd_set_closexec (new_socket);
/* Enables nonblocking I/O.
*/
ret = cherokee_fd_set_nonblocking (new_socket, true);
if (ret != ret_ok) {
LOG_WARNING (CHEROKEE_ERROR_SOCKET_NON_BLOCKING, new_socket);
cherokee_fd_close (new_socket);
return ret_error;
}
/* Disable Nagle's algorithm for this connection
* so that there is no delay involved when sending data
* which don't fill up a full IP datagram.
*/
ret = cherokee_fd_set_nodelay (new_socket, true);
if (ret != ret_ok) {
LOG_WARNING_S (CHEROKEE_ERROR_SOCKET_RM_NAGLES);
cherokee_fd_close (new_socket);
return ret_error;
}
*new_fd = new_socket;
return ret_ok;
}
ret_t
cherokee_socket_create_fd (cherokee_socket_t *sock, unsigned short int family)
{
/* Create the socket
*/
do {
sock->socket = socket (family, SOCK_STREAM, 0);
} while ((sock->socket == -1) && (errno == EINTR));
if (sock->socket < 0) {
#ifdef HAVE_IPV6
if ((family == AF_INET6) &&
(errno == EAFNOSUPPORT))
{
LOG_WARNING (CHEROKEE_ERROR_SOCKET_NO_IPV6);
} else
#endif
{
LOG_ERRNO (errno, cherokee_err_error, CHEROKEE_ERROR_SOCKET_NEW_SOCKET);
return ret_error;
}
}
/* Set the family length
*/
switch (family) {
case AF_INET:
sock->client_addr_len = sizeof (struct sockaddr_in);
memset (&sock->client_addr, 0, sock->client_addr_len);
break;
#ifdef HAVE_IPV6
case AF_INET6:
sock->client_addr_len = sizeof (struct sockaddr_in6);
memset (&sock->client_addr, 0, sock->client_addr_len);
break;
#endif
#ifdef HAVE_SOCKADDR_UN
case AF_UNIX:
memset (&sock->client_addr, 0, sizeof (struct sockaddr_un));
break;
#endif
default:
SHOULDNT_HAPPEN;
return ret_error;
}
/* Set the family
*/
SOCKET_AF(sock) = family;
return ret_ok;
}
static ret_t
cherokee_bind_v4 (cherokee_socket_t *sock, cuint_t port, cherokee_buffer_t *listen_to)
{
int re;
ret_t ret;
SOCKET_ADDR_IPv4(sock)->sin_port = htons (port);
if (cherokee_buffer_is_empty (listen_to)) {
SOCKET_ADDR_IPv4(sock)->sin_addr.s_addr = INADDR_ANY;
} else{
ret = cherokee_socket_pton (sock, listen_to);
if (ret != ret_ok) return ret;
}
re = bind (SOCKET_FD(sock), (struct sockaddr *)&SOCKET_ADDR(sock), sock->client_addr_len);
if (re != 0) return ret_error;
return ret_ok;
}
static ret_t
cherokee_bind_v6 (cherokee_socket_t *sock, cuint_t port, cherokee_buffer_t *listen_to)
{
int re;
ret_t ret;
SOCKET_ADDR_IPv6(sock)->sin6_port = htons(port);
if (cherokee_buffer_is_empty (listen_to)) {
SOCKET_ADDR_IPv6(sock)->sin6_addr = in6addr_any;
} else{
ret = cherokee_socket_pton (sock, listen_to);
if (ret != ret_ok) return ret;
}
re = bind (SOCKET_FD(sock), (struct sockaddr *)&SOCKET_ADDR(sock), sock->client_addr_len);
if (re != 0) return ret_error;
return ret_ok;
}
static ret_t
cherokee_bind_local (cherokee_socket_t *sock, cherokee_buffer_t *listen_to)
{
#ifdef HAVE_SOCKADDR_UN
int re;
struct stat buf;
/* Sanity check
*/
if ((listen_to->len <= 0) ||
(listen_to->len >= sizeof(SOCKET_SUN_PATH(sock))))
return ret_error;
/* Remove the socket if it already exists
*/
re = cherokee_stat (listen_to->buf, &buf);
if (re == 0) {
if (! S_ISSOCK(buf.st_mode)) {
LOG_CRITICAL (CHEROKEE_ERROR_SOCKET_NO_SOCKET, listen_to->buf);
return ret_error;
}
re = cherokee_unlink (listen_to->buf);
if (re != 0) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_SOCKET_REMOVE, listen_to->buf);
return ret_error;
}
}
/* Create the socket
*/
memcpy (SOCKET_SUN_PATH(sock), listen_to->buf, listen_to->len + 1);
sock->client_addr_len = sizeof(SOCKET_ADDR_UNIX(sock)->sun_family) + listen_to->len;
re = bind (SOCKET_FD(sock),
(const struct sockaddr *)SOCKET_ADDR_UNIX(sock),
sock->client_addr_len);
if (re != 0) return ret_error;
return ret_ok;
#else
return ret_no_sys;
#endif
}
ret_t
cherokee_socket_bind (cherokee_socket_t *sock, cuint_t port, cherokee_buffer_t *listen_to)
{
/* Bind
*/
switch (SOCKET_AF(sock)) {
case AF_INET:
return cherokee_bind_v4 (sock, port, listen_to);
#ifdef HAVE_IPV6
case AF_INET6:
return cherokee_bind_v6 (sock, port, listen_to);
#endif
#ifdef HAVE_SOCKADDR_UN
case AF_UNIX:
return cherokee_bind_local (sock, listen_to);
#endif
default:
break;
}
SHOULDNT_HAPPEN;
return ret_error;
}
ret_t
cherokee_socket_listen (cherokee_socket_t *socket, int backlog)
{
int re;
re = listen (SOCKET_FD(socket), backlog);
if (re < 0) return ret_error;
return ret_ok;
}
/* WARNING: all parameters MUST be valid,
* NULL pointers lead to a crash.
*/
ret_t
cherokee_socket_write (cherokee_socket_t *socket,
const char *buf,
int buf_len,
size_t *pcnt_written)
{
ret_t ret;
int err;
ssize_t len;
*pcnt_written = 0;
/* There must be something to send, otherwise behaviour is undefined
* and as we don't want this case, we have to enforce assertions.
*/
return_if_fail (buf != NULL && buf_len > 0, ret_error);
if (likely (socket->is_tls != TLS)) {
do {
len = send (SOCKET_FD(socket), buf, buf_len, 0);
} while ((len < 0) && (errno == EINTR));
if (likely (len > 0) ) {
/* Return n. of bytes sent.
*/
*pcnt_written = len;
return ret_ok;
}
if (len == 0) {
/* Very strange, socket is ready but nothing
* has been written, retry later.
*/
return ret_eagain;
}
/* Error handling
*/
err = SOCK_ERRNO();
switch (err) {
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
case EWOULDBLOCK:
#endif
case EAGAIN:
return ret_eagain;
case EPIPE:
case ECONNRESET:
#ifdef ENOTCONN
case ENOTCONN:
#endif
socket->status = socket_closed;
case ETIMEDOUT:
case EHOSTUNREACH:
return ret_error;
}
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_SOCKET_WRITE, SOCKET_FD(socket));
return ret_error;
} else if (socket->cryptor != NULL) {
ret = cherokee_cryptor_socket_write (socket->cryptor,
(char *)buf, buf_len, pcnt_written);
switch (ret) {
case ret_ok:
case ret_error:
case ret_eagain:
return ret;
case ret_eof:
socket->status = socket_closed;
return ret_eof;
default:
RET_UNKNOWN(ret);
return ret;
}
}
return ret_error;
}
/* WARNING: all parameters MUST be valid,
* NULL pointers lead to a crash.
*/
ret_t
cherokee_socket_read (cherokee_socket_t *socket,
char *buf,
int buf_size,
size_t *pcnt_read)
{
ret_t ret;
int err;
ssize_t len;
*pcnt_read = 0;
/* There must be something to read, otherwise behaviour is undefined
* and as we don't want this case, we have to enforce assertions.
*/
return_if_fail (buf != NULL && buf_size > 0, ret_error);
if (unlikely (socket->status == socket_closed)) {
TRACE(ENTRIES, "Reading a closed socket: fd=%d (TLS=%d)\n", SOCKET_FD(socket), (socket->is_tls == TLS));
return ret_eof;
}
if (likely (socket->is_tls != TLS)) {
/* Plain read
*/
do {
len = recv (SOCKET_FD(socket), buf, buf_size, 0);
} while ((len < 0) && (errno == EINTR));
if (likely (len > 0)) {
*pcnt_read = len;
return ret_ok;
}
if (len == 0) {
socket->status = socket_closed;
return ret_eof;
}
/* Error handling
*/
err = SOCK_ERRNO();
TRACE(ENTRIES",read", "Socket read error fd=%d: '%s'\n",
SOCKET_FD(socket), strerror(errno));
switch (err) {
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
case EWOULDBLOCK:
#endif
case EAGAIN:
return ret_eagain;
case EPIPE:
#ifdef ENOTCONN
case ENOTCONN:
#endif
case ECONNRESET:
socket->status = socket_closed;
case ETIMEDOUT:
case EHOSTUNREACH:
return ret_error;
}
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_SOCKET_READ, SOCKET_FD(socket));
return ret_error;
} else if (socket->cryptor != NULL) {
ret = cherokee_cryptor_socket_read (socket->cryptor,
buf, buf_size, pcnt_read);
switch (ret) {
case ret_ok:
case ret_error:
case ret_eagain:
return ret;
case ret_eof:
socket->status = socket_closed;
return ret_eof;
default:
RET_UNKNOWN(ret);
return ret;
}
}
return ret_error;
}
int
cherokee_socket_pending_read (cherokee_socket_t *socket)
{
if (socket->is_tls != TLS)
return 0;
if (unlikely ((socket->status != socket_reading) &&
(socket->status != socket_writing)))
return 0;
if (socket->cryptor != NULL) {
return cherokee_cryptor_socket_pending (socket->cryptor);
}
SHOULDNT_HAPPEN;
return 0;
}
ret_t
cherokee_socket_flush (cherokee_socket_t *socket)
{
int re;
int op = 1;
TRACE (ENTRIES",flush", "flushing fd=%d\n", socket->socket);
re = setsockopt (SOCKET_FD(socket), IPPROTO_TCP, TCP_NODELAY,
(const void *) &op, sizeof(int));
if (unlikely(re != 0))
return ret_error;
return ret_ok;
}
ret_t
cherokee_socket_test_read (cherokee_socket_t *socket)
{
int re;
char tmp;
if (socket->socket != -1)
goto eof;
do {
re = recv (socket->socket, &tmp, 1, MSG_PEEK);
} while ((re == -1) && (errno == EINTR));
if (re == 0) {
goto eof;
} else if (re == -1) {
if ((errno == EAGAIN) ||
(errno == EWOULDBLOCK))
{
goto eagain;
}
goto error;
}
TRACE(ENTRIES, "read test: %s\n", "OK");
return ret_ok;
eagain:
TRACE(ENTRIES, "read test: %s\n", "EAGAIN");
return ret_eagain;
eof:
TRACE(ENTRIES, "read test: %s\n", "EOF");
return ret_eof;
error:
TRACE(ENTRIES, "read test: %s\n", "ERROR");
return ret_eof;
}
/* WARNING: all parameters MUST be valid,
* NULL pointers lead to a crash.
*/
ret_t
cherokee_socket_writev (cherokee_socket_t *socket,
const struct iovec *vector,
uint16_t vector_len,
size_t *pcnt_written)
{
int re;
int i;
ret_t ret;
size_t cnt;
*pcnt_written = 0;
/* There must be something to send, otherwise behaviour is undefined
* and as we don't want this case, we have to enforce assertions.
*/
return_if_fail (vector != NULL && vector_len > 0, ret_error);
if (likely (socket->is_tls != TLS))
{
#ifdef _WIN32
int i;
size_t total;
for (i = 0, re = 0, total = 0; i < vector_len; i++) {
if (vector[i].iov_len == 0)
continue;
do {
re = send (SOCKET_FD(socket), vector[i].iov_base, vector[i].iov_len, 0);
} while ((re == -1) && (errno == EINTR));
if (re < 0)
break;
total += re;
/* if it is a partial send, then stop sending data
*/
if (re != vector[i].iov_len)
break;
}
*pcnt_written = total;
/* if we have sent at least one byte,
* then return OK.
*/
if (likely (total > 0))
return ret_ok;
if (re == 0) {
int err = SOCK_ERRNO();
if (i == vector_len)
return ret_ok;
/* Retry later.
*/
return ret_eagain;
}
#else /* ! WIN32 */
do {
re = writev (SOCKET_FD(socket), vector, vector_len);
} while ((re == -1) && (errno == EINTR));
if (likely (re > 0)) {
*pcnt_written = (size_t) re;
return ret_ok;
}
if (re == 0) {
int i;
/* Find out whether there was something to send or not.
*/
for (i = 0; i < vector_len; i++) {
if (vector[i].iov_base != NULL && vector[i].iov_len > 0)
break;
}
if (i < vector_len)
return ret_eagain;
/* No, nothing to send, so return ok.
*/
return ret_ok;
}
#endif
if (re < 0) {
int err = SOCK_ERRNO();
switch (err) {
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
case EWOULDBLOCK:
#endif
case EAGAIN:
return ret_eagain;
case EPIPE:
#ifdef ENOTCONN
case ENOTCONN:
#endif