1 /*****************************************************************************
2 * netutils.c: various network functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
6 * Authors: Vincent Seguin <seguin@via.ecp.fr>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
28 #include <netdb.h> /* gethostbyname() */
29 #include <stdlib.h> /* free(), realloc(), atoi() */
30 #include <errno.h> /* errno() */
31 #include <string.h> /* bzero(), bcopy() */
33 #include <netinet/in.h> /* BSD: struct in_addr */
34 #include <sys/socket.h> /* BSD: struct sockaddr */
35 #ifdef HAVE_ARPA_INET_H
36 #include <arpa/inet.h> /* inet_ntoa(), inet_aton() */
39 #if defined (HAVE_SYS_IOCTL_H)
40 #include <sys/ioctl.h> /* ioctl() */
43 #include <unistd.h> /* needed for ioctl on Solaris */
46 #if defined (HAVE_NET_IF_H)
47 #include <net/if.h> /* interface (arch-dependent) */
49 //#ifdef HAVE_SYS_SOCKIO_H
50 #include <sys/sockio.h>
62 /*****************************************************************************
63 * BuildInetAddr: build an Internet address descriptor
64 *****************************************************************************
65 * Build an internet socket descriptor from a host name, or an ip, and a port.
66 * If the address is NULL, then INADDR_ANY will be used, allowing to receive
67 * on any address for a local socket. Usually, in this case, 'port' is also null
68 * and the function always succeeds.
69 *****************************************************************************/
70 int BuildInetAddr( struct sockaddr_in *p_sa_in, char *psz_in_addr, int i_port )
72 struct hostent *p_hostent; /* host descriptor */
74 memset( p_sa_in, 0, sizeof( struct sockaddr_in ) );
75 p_sa_in->sin_family = AF_INET; /* family */
76 p_sa_in->sin_port = htons( i_port ); /* port */
78 /* Use INADDR_ANY if psz_in_addr is NULL */
79 if( psz_in_addr == NULL )
81 p_sa_in->sin_addr.s_addr = htonl(INADDR_ANY);
83 /* Try to convert address directly from in_addr - this will work if
84 * psz_in_addr is dotted decimal. */
85 #if defined HAVE_ARPA_INET_H && !defined SYS_SOLARIS
86 else if( !inet_aton( psz_in_addr, &p_sa_in->sin_addr) )
88 else if( (p_sa_in->sin_addr.s_addr = inet_addr( psz_in_addr )) == -1 )
91 /* The convertion failed: the address is an host name, which needs
93 intf_DbgMsg("debug: resolving internet address %s...\n", psz_in_addr);
94 if ( (p_hostent = gethostbyname(psz_in_addr)) == NULL)
96 intf_ErrMsg("error: unknown host %s\n", psz_in_addr);
100 /* Copy the first address of the host in the socket address */
101 memmove( &p_sa_in->sin_addr, p_hostent->h_addr_list[0], p_hostent->h_length );
107 /*****************************************************************************
108 * ServerPort: extract port from a "server:port" adress
109 *****************************************************************************
110 * Returns the port number in a "server:port" address and replace the ":" by
111 * a NUL character, or returns -1.
112 *****************************************************************************/
113 int ServerPort( char *psz_addr )
117 /* Scan string for ':' */
118 for( psz_index = psz_addr; *psz_index && (*psz_index != ':'); psz_index++ )
123 /* If a port number has been found, convert it and return it */
124 if( *psz_index == ':' )
127 return( atoi( psz_index + 1 ) );
134 /*****************************************************************************
135 * ReadIfConf: Read the configuration of an interface
136 *****************************************************************************
137 * i_sockfd must reference a socket open as follow: AF_INET, DOCK_DGRAM, 0
138 *****************************************************************************/
139 int ReadIfConf(int i_sockfd, if_descr_t* p_ifdescr, char* psz_name)
142 #if defined (HAVE_SYS_IOCTL_H) && defined(HAVE_NET_IF_H)
143 struct ifreq ifr_config;
148 /* Which interface are we interested in ? */
149 strcpy(ifr_config.ifr_name, psz_name);
151 /* Read the flags for that interface */
152 i_rc = ioctl(i_sockfd, SIOCGIFFLAGS, (byte_t *)&ifr_config);
155 p_ifdescr->i_flags = ifr_config.ifr_flags;
156 intf_DbgMsg("%s flags: 0x%x\n", psz_name, p_ifdescr->i_flags);
160 intf_ErrMsg("Cannot read flags for interface %s: %s\n", psz_name,
165 /* Read physical address of the interface and store it in our description */
167 i_rc = ioctl(i_sockfd, SIOCGENADDR, (byte_t *)&ifr_config);
169 i_rc = ioctl(i_sockfd, SIOCGIFHWADDR, (byte_t *)&ifr_config);
173 memcpy(&p_ifdescr->sa_phys_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
174 intf_DbgMsg("%s MAC address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", psz_name,
175 p_ifdescr->sa_phys_addr.sa_data[0]&0xff,
176 p_ifdescr->sa_phys_addr.sa_data[1]&0xff,
177 p_ifdescr->sa_phys_addr.sa_data[2]&0xff,
178 p_ifdescr->sa_phys_addr.sa_data[3]&0xff,
179 p_ifdescr->sa_phys_addr.sa_data[4]&0xff,
180 p_ifdescr->sa_phys_addr.sa_data[5]&0xff);
184 intf_ErrMsg("Cannot read hardware address for interface %s: %s\n",
185 psz_name, strerror(errno));
189 /* Read IP address of the interface and store it in our description */
190 i_rc = ioctl(i_sockfd, SIOCGIFADDR, (byte_t *)&ifr_config);
193 memcpy(&p_ifdescr->sa_net_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
194 intf_DbgMsg("%s IP address: %s\n", psz_name,
195 inet_ntoa(p_ifdescr->sa_net_addr.sin_addr));
199 intf_ErrMsg("Cannot read network address for interface %s: %s\n",
200 psz_name, strerror(errno));
204 /* Read broadcast address of the interface and store it in our description */
205 if(p_ifdescr->i_flags & IFF_POINTOPOINT)
207 intf_DbgMsg("%s doen't not support broadcast\n", psz_name);
208 i_rc = ioctl(i_sockfd, SIOCGIFDSTADDR, (byte_t *)&ifr_config);
212 intf_DbgMsg("%s supports broadcast\n", psz_name);
213 i_rc = ioctl(i_sockfd, SIOCGIFBRDADDR, (byte_t *)&ifr_config);
217 memcpy(&p_ifdescr->sa_bcast_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
218 intf_DbgMsg("%s broadcast address: %s\n", psz_name,
219 inet_ntoa(p_ifdescr->sa_bcast_addr.sin_addr));
223 intf_ErrMsg("Cannot read broadcast address for interface %s: %s\n",
224 psz_name, strerror(errno));
234 /*****************************************************************************
235 * ReadNetConf: Retrieve the network configuration of the host
236 *****************************************************************************
237 * Only IP interfaces are listed, and only if they are up
238 * i_sockfd must reference a socket open as follow: AF_INET, DOCK_DGRAM, 0
239 *****************************************************************************/
240 int ReadNetConf(int i_sockfd, net_descr_t* p_net_descr)
244 #if defined (HAVE_SYS_IOCTL_H) && defined (HAVE_NET_IF_H)
245 struct ifreq* a_ifr_ifconf = NULL;
246 struct ifreq* p_ifr_current_if;
247 struct ifconf ifc_netconf;
254 /* Start by assuming we have few than 3 interfaces (i_if_number will
255 be incremented by 1 when entering the loop) */
258 /* Retrieve network configuration for that host */
262 a_ifr_ifconf = realloc(a_ifr_ifconf, i_if_number*sizeof(struct ifreq));
263 ifc_netconf.ifc_len = i_if_number*sizeof(struct ifreq);
264 ifc_netconf.ifc_req = a_ifr_ifconf;
266 i_rc = ioctl(i_sockfd, SIOCGIFCONF, (byte_t*)&ifc_netconf);
269 intf_ErrMsg("Cannot read network configuration: %s\n",
274 /* If we detected ifc_len interfaces, this may mean that others have
275 been missed because the a_ifr_ifconf was to little, so increase
276 it's size and retry */
277 while( ifc_netconf.ifc_len >= i_if_number*sizeof(struct ifreq) );
279 /* No see what we detected */
282 /* Init the given net_descr_t struct */
283 p_net_descr->i_if_number = 0;
284 p_net_descr->a_if = NULL;
286 /* Iterate through the entries of the a_ifr_ifconf table */
287 p_ifr_current_if = ifc_netconf.ifc_req;
288 for( i_remaining = ifc_netconf.ifc_len / sizeof (struct ifreq);
289 i_remaining-- > 0; p_ifr_current_if++ )
291 intf_DbgMsg("Found interface %s\n", p_ifr_current_if->ifr_name);
293 /* Don't use an interface devoted to an address family other than IP */
294 if(p_ifr_current_if->ifr_addr.sa_family != AF_INET)
297 /* Read the status of this interface */
298 if( ioctl(i_sockfd, SIOCGIFFLAGS, (byte_t *)p_ifr_current_if) < 0 )
300 intf_ErrMsg("Cannot access interface %s: %s\n",
301 p_ifr_current_if->ifr_name, strerror(errno));
307 /* Skip this interface if it is not up or if this is a loopback one */
308 if( !p_ifr_current_if->ifr_flags & IFF_UP ||
309 p_ifr_current_if->ifr_flags & IFF_LOOPBACK )
312 /* Add an entry to the net_descr struct to store the description of
314 p_net_descr->i_if_number++;
315 p_net_descr->a_if = realloc(p_net_descr->a_if,
316 p_net_descr->i_if_number*sizeof(if_descr_t));
317 /* FIXME: Read the info ?? */
318 i_rc = ReadIfConf(i_sockfd, &p_net_descr->a_if[p_net_descr->i_if_number-1],
319 p_ifr_current_if->ifr_name);
324 /* Don't need the a_ifr_ifconf anymore */
325 free( a_ifr_ifconf );