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/*
network.c : Network stuff
Copyright (C) 1999-2000 Timo Sirainen
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
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "module.h"
#include "network.h"
#include <sys/un.h>
#ifndef INADDR_NONE
# define INADDR_NONE INADDR_BROADCAST
#endif
union sockaddr_union {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef HAVE_IPV6
struct sockaddr_in6 sin6;
#endif
};
#ifdef HAVE_IPV6
# define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \
sizeof(so.sin6) : sizeof(so.sin))
#else
# define SIZEOF_SOCKADDR(so) (sizeof(so.sin))
#endif
#ifdef WIN32
# define g_io_channel_new(handle) g_io_channel_win32_new_stream_socket(handle)
#else
# define g_io_channel_new(handle) g_io_channel_unix_new(handle)
#endif
/* Cygwin need this, don't know others.. */
/*#define BLOCKING_SOCKETS 1*/
IPADDR ip4_any = {
AF_INET,
{ INADDR_ANY }
};
int net_ip_compare(IPADDR *ip1, IPADDR *ip2)
{
if (ip1->family != ip2->family)
return 0;
#ifdef HAVE_IPV6
if (ip1->family == AF_INET6)
return memcmp(&ip1->ip, &ip2->ip, sizeof(ip1->ip)) == 0;
#endif
return memcmp(&ip1->ip, &ip2->ip, 4) == 0;
}
static void sin_set_ip(union sockaddr_union *so, const IPADDR *ip)
{
if (ip == NULL) {
#ifdef HAVE_IPV6
so->sin6.sin6_family = AF_INET6;
so->sin6.sin6_addr = in6addr_any;
#else
so->sin.sin_family = AF_INET;
so->sin.sin_addr.s_addr = INADDR_ANY;
#endif
return;
}
so->sin.sin_family = ip->family;
#ifdef HAVE_IPV6
if (ip->family == AF_INET6)
memcpy(&so->sin6.sin6_addr, &ip->ip, sizeof(ip->ip));
else
#endif
memcpy(&so->sin.sin_addr, &ip->ip, 4);
}
void sin_get_ip(const union sockaddr_union *so, IPADDR *ip)
{
ip->family = so->sin.sin_family;
#ifdef HAVE_IPV6
if (ip->family == AF_INET6)
memcpy(&ip->ip, &so->sin6.sin6_addr, sizeof(ip->ip));
else
#endif
memcpy(&ip->ip, &so->sin.sin_addr, 4);
}
static void sin_set_port(union sockaddr_union *so, int port)
{
#ifdef HAVE_IPV6
if (so->sin.sin_family == AF_INET6)
so->sin6.sin6_port = htons((unsigned short)port);
else
#endif
so->sin.sin_port = htons((unsigned short)port);
}
static int sin_get_port(union sockaddr_union *so)
{
#ifdef HAVE_IPV6
if (so->sin.sin_family == AF_INET6)
return ntohs(so->sin6.sin6_port);
#endif
return ntohs(so->sin.sin_port);
}
/* Connect to socket */
GIOChannel *net_connect(const char *addr, int port, IPADDR *my_ip)
{
IPADDR ip4, ip6, *ip;
int family;
g_return_val_if_fail(addr != NULL, NULL);
family = my_ip == NULL ? 0 : my_ip->family;
if (net_gethostbyname(addr, &ip4, &ip6) == -1)
return NULL;
if (my_ip == NULL) {
/* prefer IPv4 addresses */
ip = ip4.family != 0 ? &ip4 : &ip6;
} else if (IPADDR_IS_V6(my_ip)) {
/* my_ip is IPv6 address, use it if possible */
if (ip6.family != 0)
ip = &ip6;
else {
my_ip = NULL;
ip = &ip4;
}
} else {
/* my_ip is IPv4 address, use it if possible */
if (ip4.family != 0)
ip = &ip4;
else {
my_ip = NULL;
ip = &ip6;
}
}
return net_connect_ip(ip, port, my_ip);
}
/* Connect to socket with ip address */
GIOChannel *net_connect_ip(IPADDR *ip, int port, IPADDR *my_ip)
{
union sockaddr_union so;
int handle, ret, opt = 1;
if (my_ip != NULL && ip->family != my_ip->family) {
g_warning("net_connect_ip(): ip->family != my_ip->family");
my_ip = NULL;
}
/* create the socket */
memset(&so, 0, sizeof(so));
so.sin.sin_family = ip->family;
handle = socket(ip->family, SOCK_STREAM, 0);
if (handle == -1)
return NULL;
/* set socket options */
#ifndef WIN32
fcntl(handle, F_SETFL, O_NONBLOCK);
#endif
setsockopt(handle, SOL_SOCKET, SO_REUSEADDR,
(char *) &opt, sizeof(opt));
setsockopt(handle, SOL_SOCKET, SO_KEEPALIVE,
(char *) &opt, sizeof(opt));
/* set our own address */
if (my_ip != NULL) {
sin_set_ip(&so, my_ip);
if (bind(handle, &so.sa, SIZEOF_SOCKADDR(so)) < 0) {
int old_errno = errno;
close(handle);
errno = old_errno;
return NULL;
}
}
/* connect */
sin_set_ip(&so, ip);
sin_set_port(&so, port);
ret = connect(handle, &so.sa, SIZEOF_SOCKADDR(so));
#ifndef WIN32
if (ret < 0 && errno != EINPROGRESS)
#else
if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
#endif
{
int old_errno = errno;
close(handle);
errno = old_errno;
return NULL;
}
return g_io_channel_new(handle);
}
/* Connect to named UNIX socket */
GIOChannel *net_connect_unix(const char *path)
{
struct sockaddr_un sa;
int handle, ret;
/* create the socket */
handle = socket(PF_UNIX, SOCK_STREAM, 0);
if (handle == -1)
return NULL;
/* set socket options */
#ifndef WIN32
fcntl(handle, F_SETFL, O_NONBLOCK);
#endif
/* connect */
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_UNIX;
strncpy(sa.sun_path, path, sizeof(sa.sun_path)-1);
sa.sun_path[sizeof(sa.sun_path)-1] = '\0';
ret = connect(handle, (struct sockaddr *) &sa, sizeof(sa));
if (ret < 0 && errno != EINPROGRESS) {
int old_errno = errno;
close(handle);
errno = old_errno;
return NULL;
}
return g_io_channel_new(handle);
}
/* Disconnect socket */
void net_disconnect(GIOChannel *handle)
{
g_return_if_fail(handle != NULL);
g_io_channel_close(handle);
g_io_channel_unref(handle);
}
/* Listen for connections on a socket. if `my_ip' is NULL, listen in any
address. */
GIOChannel *net_listen(IPADDR *my_ip, int *port)
{
union sockaddr_union so;
int ret, handle, opt = 1;
socklen_t len;
g_return_val_if_fail(port != NULL, NULL);
memset(&so, 0, sizeof(so));
sin_set_ip(&so, my_ip);
sin_set_port(&so, *port);
/* create the socket */
handle = socket(so.sin.sin_family, SOCK_STREAM, 0);
#ifdef HAVE_IPV6
if (handle == -1 && (errno == EINVAL || errno == EAFNOSUPPORT)) {
/* IPv6 is not supported by OS */
so.sin.sin_family = AF_INET;
so.sin.sin_addr.s_addr = INADDR_ANY;
handle = socket(AF_INET, SOCK_STREAM, 0);
}
#endif
if (handle == -1)
return NULL;
/* set socket options */
#ifndef WIN32
fcntl(handle, F_SETFL, O_NONBLOCK);
#endif
setsockopt(handle, SOL_SOCKET, SO_REUSEADDR,
(char *) &opt, sizeof(opt));
setsockopt(handle, SOL_SOCKET, SO_KEEPALIVE,
(char *) &opt, sizeof(opt));
/* specify the address/port we want to listen in */
ret = bind(handle, &so.sa, SIZEOF_SOCKADDR(so));
if (ret >= 0) {
/* get the actual port we started listen */
len = SIZEOF_SOCKADDR(so);
ret = getsockname(handle, &so.sa, &len);
if (ret >= 0) {
*port = sin_get_port(&so);
/* start listening */
if (listen(handle, 1) >= 0)
return g_io_channel_new(handle);
}
}
/* error */
close(handle);
return NULL;
}
/* Accept a connection on a socket */
GIOChannel *net_accept(GIOChannel *handle, IPADDR *addr, int *port)
{
union sockaddr_union so;
int ret;
socklen_t addrlen;
g_return_val_if_fail(handle != NULL, NULL);
addrlen = sizeof(so);
ret = accept(g_io_channel_unix_get_fd(handle), &so.sa, &addrlen);
if (ret < 0)
return NULL;
if (addr != NULL) sin_get_ip(&so, addr);
if (port != NULL) *port = sin_get_port(&so);
#ifndef WIN32
fcntl(ret, F_SETFL, O_NONBLOCK);
#endif
return g_io_channel_new(ret);
}
/* Read data from socket, return number of bytes read, -1 = error */
int net_receive(GIOChannel *handle, char *buf, int len)
{
gsize ret;
int err;
g_return_val_if_fail(handle != NULL, -1);
g_return_val_if_fail(buf != NULL, -1);
err = g_io_channel_read(handle, buf, len, &ret);
if (err == 0 && ret == 0)
return -1; /* disconnected */
if (err == G_IO_ERROR_AGAIN || (err != 0 && errno == EINTR))
return 0; /* no bytes received */
return err == 0 ? (int)ret : -1;
}
/* Transmit data, return number of bytes sent, -1 = error */
int net_transmit(GIOChannel *handle, const char *data, int len)
{
gsize ret;
int err;
g_return_val_if_fail(handle != NULL, -1);
g_return_val_if_fail(data != NULL, -1);
err = g_io_channel_write(handle, (char *) data, len, &ret);
if (err == G_IO_ERROR_AGAIN ||
(err != 0 && (errno == EINTR || errno == EPIPE)))
return 0;
return err == 0 ? (int)ret : -1;
}
/* Get socket address/port */
int net_getsockname(GIOChannel *handle, IPADDR *addr, int *port)
{
union sockaddr_union so;
socklen_t addrlen;
g_return_val_if_fail(handle != NULL, -1);
g_return_val_if_fail(addr != NULL, -1);
addrlen = sizeof(so);
if (getsockname(g_io_channel_unix_get_fd(handle),
(struct sockaddr *) &so, &addrlen) == -1)
return -1;
sin_get_ip(&so, addr);
if (port) *port = sin_get_port(&so);
return 0;
}
/* Get IP addresses for host, both IPv4 and IPv6 if possible.
If ip->family is 0, the address wasn't found.
Returns 0 = ok, others = error code for net_gethosterror() */
int net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6)
{
#ifdef HAVE_IPV6
union sockaddr_union *so;
struct addrinfo hints, *ai, *ailist;
int ret, count_v4, count_v6, use_v4, use_v6;
#else
struct hostent *hp;
int count;
#endif
g_return_val_if_fail(addr != NULL, -1);
memset(ip4, 0, sizeof(IPADDR));
memset(ip6, 0, sizeof(IPADDR));
#ifdef HAVE_IPV6
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_socktype = SOCK_STREAM;
/* save error to host_error for later use */
ret = getaddrinfo(addr, NULL, &hints, &ailist);
if (ret != 0)
return ret;
/* count IPs */
count_v4 = count_v6 = 0;
for (ai = ailist; ai != NULL; ai = ai->ai_next) {
if (ai->ai_family == AF_INET)
count_v4++;
else if (ai->ai_family == AF_INET6)
count_v6++;
}
if (count_v4 == 0 && count_v6 == 0)
return HOST_NOT_FOUND; /* shouldn't happen? */
/* if there are multiple addresses, return random one */
use_v4 = count_v4 <= 1 ? 0 : rand() % count_v4;
use_v6 = count_v6 <= 1 ? 0 : rand() % count_v6;
count_v4 = count_v6 = 0;
for (ai = ailist; ai != NULL; ai = ai->ai_next) {
so = (union sockaddr_union *) ai->ai_addr;
if (ai->ai_family == AF_INET) {
if (use_v4 == count_v4)
sin_get_ip(so, ip4);
count_v4++;
} else if (ai->ai_family == AF_INET6) {
if (use_v6 == count_v6)
sin_get_ip(so, ip6);
count_v6++;
}
}
freeaddrinfo(ailist);
return 0;
#else
hp = gethostbyname(addr);
if (hp == NULL)
return h_errno;
/* count IPs */
count = 0;
while (hp->h_addr_list[count] != NULL)
count++;
if (count == 0)
return HOST_NOT_FOUND; /* shouldn't happen? */
/* if there are multiple addresses, return random one */
ip4->family = AF_INET;
memcpy(&ip4->ip, hp->h_addr_list[rand() % count], 4);
return 0;
#endif
}
/* Get name for host, *name should be g_free()'d unless it's NULL.
Return values are the same as with net_gethostbyname() */
int net_gethostbyaddr(IPADDR *ip, char **name)
{
#ifdef HAVE_IPV6
union sockaddr_union so;
int host_error;
char hostname[NI_MAXHOST];
#else
struct hostent *hp;
#endif
g_return_val_if_fail(ip != NULL, -1);
g_return_val_if_fail(name != NULL, -1);
*name = NULL;
#ifdef HAVE_IPV6
memset(&so, 0, sizeof(so));
sin_set_ip(&so, ip);
/* save error to host_error for later use */
host_error = getnameinfo((struct sockaddr *) &so, sizeof(so),
hostname, sizeof(hostname), NULL, 0, 0);
if (host_error != 0)
return host_error;
*name = g_strdup(hostname);
#else
if (ip->family != AF_INET) return -1;
hp = gethostbyaddr((const char *) &ip->ip, 4, AF_INET);
if (hp == NULL) return -1;
*name = g_strdup(hp->h_name);
#endif
return 0;
}
int net_ip2host(IPADDR *ip, char *host)
{
#ifdef HAVE_IPV6
if (!inet_ntop(ip->family, &ip->ip, host, MAX_IP_LEN))
return -1;
#else
unsigned long ip4;
if (ip->family != AF_INET) {
strcpy(host, "0.0.0.0");
} else {
ip4 = ntohl(ip->ip.s_addr);
g_snprintf(host, MAX_IP_LEN, "%lu.%lu.%lu.%lu",
(ip4 & 0xff000000UL) >> 24,
(ip4 & 0x00ff0000) >> 16,
(ip4 & 0x0000ff00) >> 8,
(ip4 & 0x000000ff));
}
#endif
return 0;
}
int net_host2ip(const char *host, IPADDR *ip)
{
unsigned long addr;
if (strchr(host, ':') != NULL) {
/* IPv6 */
ip->family = AF_INET6;
#ifdef HAVE_IPV6
if (inet_pton(AF_INET6, host, &ip->ip) == 0)
return -1;
#else
ip->ip.s_addr = 0;
#endif
} else {
/* IPv4 */
ip->family = AF_INET;
#ifdef HAVE_INET_ATON
if (inet_aton(host, &ip->ip.s_addr) == 0)
return -1;
#else
addr = inet_addr(host);
if (addr == INADDR_NONE)
return -1;
memcpy(&ip->ip, &addr, 4);
#endif
}
return 0;
}
/* Get socket error */
int net_geterror(GIOChannel *handle)
{
int data;
socklen_t len = sizeof(data);
if (getsockopt(g_io_channel_unix_get_fd(handle),
SOL_SOCKET, SO_ERROR, (void *) &data, &len) == -1)
return -1;
return data;
}
/* get error of net_gethostname() */
const char *net_gethosterror(int error)
{
#ifdef HAVE_IPV6
g_return_val_if_fail(error != 0, NULL);
if (error == 1) {
/* getnameinfo() failed ..
FIXME: does strerror return the right error message? */
return g_strerror(errno);
}
return gai_strerror(error);
#else
switch (error) {
case HOST_NOT_FOUND:
return "Host not found";
case NO_ADDRESS:
return "No IP address found for name";
case NO_RECOVERY:
return "A non-recovable name server error occurred";
case TRY_AGAIN:
return "A temporary error on an authoritative name server";
}
/* unknown error */
return NULL;
#endif
}
/* return TRUE if host lookup failed because it didn't exist (ie. not
some error with name server) */
int net_hosterror_notfound(int error)
{
#ifdef HAVE_IPV6
#ifdef EAI_NODATA /* NODATA is depricated */
return error != 1 && (error == EAI_NONAME || error == EAI_NODATA);
#else
return error != 1 && (error == EAI_NONAME);
#endif
#else
return error == HOST_NOT_FOUND || error == NO_ADDRESS;
#endif
}
/* Get name of TCP service */
char *net_getservbyport(int port)
{
struct servent *entry;
entry = getservbyport(htons((unsigned short) port), "tcp");
return entry == NULL ? NULL : entry->s_name;
}
int is_ipv4_address(const char *host)
{
while (*host != '\0') {
if (*host != '.' && !i_isdigit(*host))
return 0;
host++;
}
return 1;
}
int is_ipv6_address(const char *host)
{
while (*host != '\0') {
if (*host != ':' && !i_isxdigit(*host))
return 0;
host++;
}
return 1;
}
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