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uhub/src/network.c

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/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2009, Jan Vidar Krey
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "uhub.h"
static int is_ipv6_supported = -1; /* -1 = CHECK, 0 = NO, 1 = YES */
static int net_initialized = 0;
static struct net_statistics stats;
static struct net_statistics stats_total;
#if defined(IPV6_BINDV6ONLY)
#define SOCK_DUAL_STACK_OPT IPV6_BINDV6ONLY
#elif defined(IPV6_V6ONLY)
#define SOCK_DUAL_STACK_OPT IPV6_V6ONLY
#endif
int net_initialize()
{
if (!net_initialized)
{
#ifdef WINSOCK
struct WSAData wsa;
if (WSAStartup(MAKEWORD(2, 2), &wsa) != NO_ERROR)
{
hub_log(log_error, "Unable to initialize winsock.");
return -1;
}
#endif /* WINSOCK */
hub_log(log_trace, "Initializing network monitor.");
net_stats_initialize();
#ifdef SSL_SUPPORT
hub_log(log_trace, "Initializing OpenSSL...");
SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
#endif /* SSL_SUPPORT */
net_initialized = 1;
return 0;
}
return -1;
}
int net_destroy()
{
if (net_initialized)
{
hub_log(log_trace, "Shutting down network monitor");
#ifdef SSL_SUPPORT
/* FIXME: Shutdown OpenSSL here. */
#endif
#ifdef WINSOCK
WSACleanup();
#endif
net_initialized = 0;
return 0;
}
return -1;
}
static void net_error_out(int fd, const char* func)
{
int err = net_error();
hub_log(log_error, "%s, fd=%d: %s (%d)", func, fd, net_error_string(err), err);
}
int net_error()
{
#ifdef WINSOCK
return WSAGetLastError();
#else
return errno;
#endif
}
const char* net_error_string(int code)
{
#ifdef WINSOCK
static char string[32];
snprintf(string, 32, "error code: %d", code);
return string;
#else
return strerror(code);
#endif
}
static int net_setsockopt(int fd, int level, int opt, const void* optval, socklen_t optlen)
{
int ret = -1;
#ifdef WINSOCK
ret = setsockopt(fd, level, opt, (const char*) optval, optlen);
#else
ret = setsockopt(fd, level, opt, optval, optlen);
#endif
if (ret == -1)
{
net_error_out(fd, "net_setsockopt");
}
return ret;
}
static int net_getsockopt(int fd, int level, int opt, void* optval, socklen_t* optlen)
{
int ret = -1;
#ifdef WINSOCK
ret = getsockopt(fd, level, opt, (char*) optval, optlen);
#else
ret = getsockopt(fd, level, opt, optval, optlen);
#endif
if (ret == -1)
{
net_error_out(fd, "net_getsockopt");
}
return ret;
}
int net_set_nonblocking(int fd, int toggle)
{
int ret = -1;
#ifdef WINSOCK
u_long on = toggle ? 1 : 0;
ret = ioctlsocket(fd, FIONBIO, &on);
#else
ret = ioctl(fd, FIONBIO, &toggle);
#endif
if (ret == -1)
{
net_error_out(fd, "net_set_nonblocking");
}
return ret;
}
/* NOTE: Possibly only supported on BSD and OSX? */
int net_set_nosigpipe(int fd, int toggle)
{
int ret = -1;
#ifdef SO_NOSIGPIPE
ret = net_setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &toggle, sizeof(toggle));
if (ret == -1)
{
net_error_out(fd, "net_set_nosigpipe");
}
#endif
return ret;
}
int net_set_close_on_exec(int fd, int toggle)
{
#ifdef WINSOCK
return -1; /* FIXME: How is this done on Windows? */
#else
return fcntl(fd, F_SETFD, toggle);
#endif
}
int net_set_linger(int fd, int toggle)
{
int ret;
ret = net_setsockopt(fd, SOL_SOCKET, SO_LINGER, &toggle, sizeof(toggle));
if (ret == -1)
{
net_error_out(fd, "net_set_linger");
}
return ret;
}
int net_set_keepalive(int fd, int toggle)
{
int ret;
ret = net_setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &toggle, sizeof(toggle));
if (ret == -1)
{
net_error_out(fd, "net_set_keepalive");
}
return ret;
}
int net_set_reuseaddress(int fd, int toggle)
{
int ret;
ret = net_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &toggle, sizeof(toggle));
if (ret == -1)
{
net_error_out(fd, "net_set_reuseaddress");
}
return ret;
}
int net_set_sendbuf_size(int fd, size_t size)
{
return net_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size));
}
int net_get_sendbuf_size(int fd, size_t* size)
{
socklen_t sz = sizeof(*size);
return net_getsockopt(fd, SOL_SOCKET, SO_SNDBUF, size, &sz);
}
int net_set_recvbuf_size(int fd, size_t size)
{
return net_setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
}
int net_get_recvbuf_size(int fd, size_t* size)
{
socklen_t sz = sizeof(*size);
return net_getsockopt(fd, SOL_SOCKET, SO_RCVBUF, size, &sz);
}
int net_close(int fd)
{
#ifdef WINSOCK
int ret = closesocket(fd);
#else
int ret = close(fd);
#endif
if (ret == 0)
{
net_stats_add_close();
}
else
{
if (fd != -1)
{
net_stats_add_error();
}
}
return ret;
}
int net_shutdown_r(int fd)
{
#ifdef WINSOCK
return shutdown(fd, SD_RECEIVE);
#else
return shutdown(fd, SHUT_RD);
#endif
}
int net_shutdown_w(int fd)
{
#ifdef WINSOCK
return shutdown(fd, SD_SEND);
#else
return shutdown(fd, SHUT_WR);
#endif
}
int net_shutdown_rw(int fd)
{
#ifdef WINSOCK
return shutdown(fd, SD_BOTH);
#else
return shutdown(fd, SHUT_RDWR);
#endif
}
int net_accept(int fd, struct ip_addr_encap* ipaddr)
{
struct sockaddr_storage addr;
struct sockaddr_in* addr4;
struct sockaddr_in6* addr6;
socklen_t addr_size;
int ret = 0;
addr_size = sizeof(struct sockaddr_storage);
memset(&addr, 0, addr_size);
addr4 = (struct sockaddr_in*) &addr;
addr6 = (struct sockaddr_in6*) &addr;
ret = accept(fd, (struct sockaddr*) &addr, &addr_size);
if (ret == -1)
{
switch (net_error())
{
#if defined(__linux__)
case ENETDOWN:
case EPROTO:
case ENOPROTOOPT:
case EHOSTDOWN:
case ENONET:
case EHOSTUNREACH:
case EOPNOTSUPP:
errno = EWOULDBLOCK;
#endif
case EWOULDBLOCK:
break;
default:
net_error_out(fd, "net_accept");
net_stats_add_error();
return -1;
}
}
else
{
net_stats_add_accept();
if (ipaddr)
{
memset(ipaddr, 0, sizeof(struct ip_addr_encap));
ipaddr->af = addr4->sin_family;
if (ipaddr->af == AF_INET6)
{
memcpy(&ipaddr->internal_ip_data.in6, &addr6->sin6_addr, sizeof(struct in6_addr));
}
else
{
memcpy(&ipaddr->internal_ip_data.in, &addr4->sin_addr, sizeof(struct in_addr));
}
}
}
return ret;
}
int net_connect(int fd, const struct sockaddr *serv_addr, socklen_t addrlen)
{
int ret = connect(fd, serv_addr, addrlen);
if (ret == -1)
{
if (net_error() != EINPROGRESS)
{
net_error_out(fd, "net_connect");
net_stats_add_error();
}
}
return ret;
}
int net_is_ipv6_supported()
{
if (is_ipv6_supported == -1)
{
int ret = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (ret == -1)
{
#ifdef WINSOCK
if (net_error() == WSAEAFNOSUPPORT)
#else
if (net_error() == EAFNOSUPPORT)
#endif
{
hub_log(log_trace, "net_is_ipv6_supported(): IPv6 is not supported on this system.");
is_ipv6_supported = 0;
return 0;
}
net_error_out(ret, "net_is_ipv6_supported");
}
else
{
#ifdef SOCK_DUAL_STACK_OPT
int off = 0;
if (net_setsockopt(ret, IPPROTO_IPV6, SOCK_DUAL_STACK_OPT, (char*) &off, sizeof(off)) < 0)
{
hub_log(log_error, "net_socket_create(): Dual stack IPv6/IPv4 is not supported.");
is_ipv6_supported = 0;
}
else
{
is_ipv6_supported = 1;
}
#else
is_ipv6_supported = 0;
#endif
net_close(ret);
}
}
return is_ipv6_supported;
}
int net_socket_create(int af, int type, int protocol)
{
int sd = socket(af, type, protocol);
if (sd == -1)
{
net_error_out(sd, "net_socket_create");
}
#ifdef SOCK_DUAL_STACK_OPT
/* BSD style */
if (af == AF_INET6)
{
int off = 0;
if (net_setsockopt(sd, IPPROTO_IPV6, SOCK_DUAL_STACK_OPT, (char*) &off, sizeof(off)) < 0)
{
hub_log(log_error, "net_socket_create(): Cannot set socket to dual stack mode IPv6/IPv4 (%d - %s).", net_error(), net_error_string(net_error()));
}
}
#endif
return sd;
}
const char* net_address_to_string(int af, const void* src, char* dst, socklen_t cnt)
{
#ifdef WINSOCK
struct sockaddr_in sin4;
struct sockaddr_in6 sin6;
struct in_addr* addr4 = (struct in_addr*) src;
struct in6_addr* addr6 = (struct in6_addr*) src;
size_t size;
LPSOCKADDR addr;
DWORD len = cnt;
switch (af)
{
case AF_INET:
sin4.sin_family = AF_INET;
sin4.sin_port = 0;
sin4.sin_addr = *addr4;
size = sizeof(sin4);
addr = (LPSOCKADDR) &sin4;
break;
case AF_INET6:
sin6.sin6_family = AF_INET6;
sin6.sin6_port = 0;
sin6.sin6_addr = *addr6;
size = sizeof(sin6);
addr = (LPSOCKADDR) &sin6;
break;
default:
return NULL;
}
if (WSAAddressToString(addr, size, NULL, dst, &len) == 0)
{
return dst;
}
return NULL;
#else
return inet_ntop(af, src, dst, cnt);
#endif
}
int net_string_to_address(int af, const char* src, void* dst)
{
#ifdef WINSOCK
int ret, size;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
struct sockaddr* addr = 0;
if (af == AF_INET6)
{
if (net_is_ipv6_supported() != 1) return -1;
size = sizeof(struct sockaddr_in6);
addr = (struct sockaddr*) &addr6;
}
else
{
size = sizeof(struct sockaddr_in);
addr = (struct sockaddr*) &addr4;
}
if (!net_initialized)
net_initialize();
ret = WSAStringToAddressA((char*) src, af, NULL, addr, &size);
if (ret == -1)
{
return -1;
}
if (af == AF_INET6)
{
memcpy(dst, &addr6.sin6_addr, sizeof(addr6.sin6_addr));
}
else
{
memcpy(dst, &addr4.sin_addr, sizeof(addr4.sin_addr));
}
return 1;
#else
return inet_pton(af, src, dst);
#endif
}
const char* net_get_peer_address(int fd)
{
static char address[INET6_ADDRSTRLEN+1];
struct sockaddr_storage storage;
struct sockaddr_in6* name6;
struct sockaddr_in* name4;
struct sockaddr* name;
memset(address, 0, INET6_ADDRSTRLEN);
socklen_t namelen = sizeof(struct sockaddr_storage);
memset(&storage, 0, namelen);
name6 = (struct sockaddr_in6*) &storage;
name4 = (struct sockaddr_in*) &storage;
name = (struct sockaddr*) &storage;
if (getpeername(fd, (struct sockaddr*) name, &namelen) != -1)
{
int af = name4->sin_family;
if (af == AF_INET6)
{
net_address_to_string(af, (void*) &name6->sin6_addr, address, INET6_ADDRSTRLEN);
if (strncmp(address, "::ffff:", 7) == 0) /* IPv6 mapped IPv4 address. */
{
return &address[7];
}
return address;
}
else
{
net_address_to_string(af, (void*) &name4->sin_addr, address, INET6_ADDRSTRLEN);
return address;
}
}
else
{
net_error_out(fd, "net_get_peer_address");
net_stats_add_error();
}
return "0.0.0.0";
}
ssize_t net_recv(int fd, void* buf, size_t len, int flags)
{
ssize_t ret = recv(fd, buf, len, flags);
if (ret >= 0)
{
net_stats_add_rx(ret);
}
else
{
if (net_error() != EWOULDBLOCK)
{
/* net_error_out(fd, "net_recv"); */
net_stats_add_error();
}
}
return ret;
}
ssize_t net_send(int fd, const void* buf, size_t len, int flags)
{
ssize_t ret = send(fd, buf, len, flags);
if (ret >= 0)
{
net_stats_add_tx(ret);
}
else
{
if (net_error() != EWOULDBLOCK)
{
/* net_error_out(fd, "net_send"); */
net_stats_add_error();
}
}
return ret;
}
int net_bind(int fd, const struct sockaddr *my_addr, socklen_t addrlen)
{
int ret = bind(fd, my_addr, addrlen);
if (ret == -1)
{
net_error_out(fd, "net_bind");
net_stats_add_error();
}
return ret;
}
int net_listen(int fd, int backlog)
{
int ret = listen(fd, backlog);
if (ret == -1)
{
net_error_out(fd, "net_listen");
net_stats_add_error();
}
return ret;
}
void net_stats_initialize()
{
memset(&stats_total, 0, sizeof(struct net_statistics));
stats_total.timestamp = time(NULL);
memset(&stats, 0, sizeof(struct net_statistics));
stats.timestamp = time(NULL);
}
void net_stats_get(struct net_statistics** intermediate, struct net_statistics** total)
{
*intermediate = &stats;
*total = &stats_total;
}
void net_stats_reset()
{
stats_total.tx += stats.tx;
stats_total.rx += stats.rx;
stats_total.accept += stats.accept;
stats_total.errors += stats.errors;
stats_total.closed += stats.closed;
memset(&stats, 0, sizeof(struct net_statistics));
stats.timestamp = time(NULL);
}
int net_stats_timeout()
{
return (difftime(time(NULL), stats.timestamp) > TIMEOUT_STATS) ? 1 : 0;
}
void net_stats_add_tx(size_t bytes)
{
stats.tx += bytes;
}
void net_stats_add_rx(size_t bytes)
{
stats.rx += bytes;
}
void net_stats_add_accept()
{
stats.accept++;
}
void net_stats_add_error()
{
stats.errors++;
}
void net_stats_add_close()
{
stats.closed++;
}
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