1 /*****************************************************************************
2 * netutils.c: various network functions
4 *****************************************************************************
6 *****************************************************************************
9 *****************************************************************************/
11 /*****************************************************************************
13 *****************************************************************************/
19 #include <sys/ioctl.h>
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <netinet/in.h>
23 #include <arpa/inet.h>
35 /*****************************************************************************
36 * BuildInetAddr: build an Internet address descriptor
37 *****************************************************************************
38 * Build an internet socket descriptor from a host name, or an ip, and a port.
39 * If the address is NULL, then INADDR_ANY will be used, allowing to receive
40 * on any address for a local socket. Usually, in this case, 'port' is also null
41 * and the function always succeeds.
42 *****************************************************************************/
43 int BuildInetAddr( struct sockaddr_in *p_sa_in, char *psz_in_addr, int i_port )
45 struct hostent *p_hostent; /* host descriptor */
47 bzero( p_sa_in, sizeof( struct sockaddr_in ) );
48 p_sa_in->sin_family = AF_INET; /* family */
49 p_sa_in->sin_port = htons( i_port ); /* port */
51 /* Use INADDR_ANY if psz_in_addr is NULL */
52 if( psz_in_addr == NULL )
54 p_sa_in->sin_addr.s_addr = htonl(INADDR_ANY);
56 /* Try to convert address directly from in_addr - this will work if
57 * psz_in_addr is dotted decimal. */
58 else if( !inet_aton( psz_in_addr, &p_sa_in->sin_addr) )
60 /* The convertion failed: the address is an host name, which needs
62 intf_DbgMsg("debug: resolving internet address %s...\n", psz_in_addr);
63 if ( (p_hostent = gethostbyname(psz_in_addr)) == NULL)
65 intf_ErrMsg("error: unknown host %s\n", psz_in_addr);
69 /* Copy the first address of the host in the socket address */
70 bcopy( p_hostent->h_addr_list[0], &p_sa_in->sin_addr, p_hostent->h_length);
76 /*****************************************************************************
77 * ServerPort: extract port from a "server:port" adress
78 *****************************************************************************
79 * Returns the port number in a "server:port" address and replace the ":" by
80 * a NUL character, or returns -1.
81 *****************************************************************************/
82 int ServerPort( char *psz_addr )
86 /* Scan string for ':' */
87 for( psz_index = psz_addr; *psz_index && (*psz_index != ':'); psz_index++ )
92 /* If a port number has been found, convert it and return it */
93 if( *psz_index == ':' )
96 return( atoi( psz_index + 1 ) );
103 /*****************************************************************************
104 * ReadIfConf: Read the configuration of an interface
105 *****************************************************************************
106 * i_sockfd must reference a socket open as follow: AF_INET, DOCK_DGRAM, 0
107 *****************************************************************************/
108 int ReadIfConf(int i_sockfd, if_descr_t* p_ifdescr, char* psz_name)
110 struct ifreq ifr_config;
116 /* Which interface are we interested in ? */
117 strcpy(ifr_config.ifr_name, psz_name);
119 /* Read the flags for that interface */
120 i_rc = ioctl(i_sockfd, SIOCGIFFLAGS, (byte_t *)&ifr_config);
123 p_ifdescr->i_flags = ifr_config.ifr_flags;
124 intf_DbgMsg("%s flags: 0x%x\n", psz_name, p_ifdescr->i_flags);
128 intf_ErrMsg("Cannot read flags for interface %s: %s\n", psz_name,
133 /* Read physical address of the interface and store it in our description */
134 i_rc = ioctl(i_sockfd, SIOCGIFHWADDR, (byte_t *)&ifr_config);
137 memcpy(&p_ifdescr->sa_phys_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
138 intf_DbgMsg("%s MAC address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", psz_name,
139 p_ifdescr->sa_phys_addr.sa_data[0]&0xff,
140 p_ifdescr->sa_phys_addr.sa_data[1]&0xff,
141 p_ifdescr->sa_phys_addr.sa_data[2]&0xff,
142 p_ifdescr->sa_phys_addr.sa_data[3]&0xff,
143 p_ifdescr->sa_phys_addr.sa_data[4]&0xff,
144 p_ifdescr->sa_phys_addr.sa_data[5]&0xff);
148 intf_ErrMsg("Cannot read hardware address for interface %s: %s\n",
149 psz_name, strerror(errno));
153 /* Read IP address of the interface and store it in our description */
154 i_rc = ioctl(i_sockfd, SIOCGIFADDR, (byte_t *)&ifr_config);
157 memcpy(&p_ifdescr->sa_net_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
158 intf_DbgMsg("%s IP address: %s\n", psz_name,
159 inet_ntoa(p_ifdescr->sa_net_addr.sin_addr));
163 intf_ErrMsg("Cannot read network address for interface %s: %s\n",
164 psz_name, strerror(errno));
168 /* Read broadcast address of the interface and store it in our description */
169 if(p_ifdescr->i_flags & IFF_POINTOPOINT)
171 intf_DbgMsg("%s doen't not support broadcast\n", psz_name);
172 i_rc = ioctl(i_sockfd, SIOCGIFDSTADDR, (byte_t *)&ifr_config);
176 intf_DbgMsg("%s supports broadcast\n", psz_name);
177 i_rc = ioctl(i_sockfd, SIOCGIFBRDADDR, (byte_t *)&ifr_config);
181 memcpy(&p_ifdescr->sa_bcast_addr, &ifr_config.ifr_addr, sizeof(struct sockaddr));
182 intf_DbgMsg("%s broadcast address: %s\n", psz_name,
183 inet_ntoa(p_ifdescr->sa_bcast_addr.sin_addr));
187 intf_ErrMsg("Cannot read broadcast address for interface %s: %s\n",
188 psz_name, strerror(errno));
197 /*****************************************************************************
198 * ReadNetConf: Retrieve the network configuration of the host
199 *****************************************************************************
200 * Only IP interfaces are listed, and only if they are up
201 * i_sockfd must reference a socket open as follow: AF_INET, DOCK_DGRAM, 0
202 *****************************************************************************/
203 int ReadNetConf(int i_sockfd, net_descr_t* p_net_descr)
205 struct ifreq* a_ifr_ifconf = NULL;
206 struct ifreq* p_ifr_current_if;
207 struct ifconf ifc_netconf;
215 /* Start by assuming we have few than 3 interfaces (i_if_number will
216 be incremented by 1 when entering the loop) */
219 /* Retrieve network configuration for that host */
223 a_ifr_ifconf = realloc(a_ifr_ifconf, i_if_number*sizeof(struct ifreq));
224 ifc_netconf.ifc_len = i_if_number*sizeof(struct ifreq);
225 ifc_netconf.ifc_req = a_ifr_ifconf;
227 i_rc = ioctl(i_sockfd, SIOCGIFCONF, (byte_t*)&ifc_netconf);
230 intf_ErrMsg("Cannot read network configuration: %s\n",
235 /* If we detected ifc_len interfaces, this may mean that others have
236 been missed because the a_ifr_ifconf was to little, so increase
237 it's size and retry */
238 while( ifc_netconf.ifc_len >= i_if_number*sizeof(struct ifreq) );
240 /* No see what we detected */
243 /* Init the given net_descr_t struct */
244 p_net_descr->i_if_number = 0;
245 p_net_descr->a_if = NULL;
247 /* Iterate through the entries of the a_ifr_ifconf table */
248 p_ifr_current_if = ifc_netconf.ifc_req;
249 for( i_remaining = ifc_netconf.ifc_len / sizeof (struct ifreq);
250 i_remaining-- > 0; p_ifr_current_if++ )
252 intf_DbgMsg("Found interface %s\n", p_ifr_current_if->ifr_name);
254 /* Don't use an interface devoted to an address family other than IP */
255 if(p_ifr_current_if->ifr_addr.sa_family != AF_INET)
258 /* Read the status of this interface */
259 if( ioctl(i_sockfd, SIOCGIFFLAGS, (byte_t *)p_ifr_current_if) < 0 )
261 intf_ErrMsg("Cannot access interface %s: %s\n",
262 p_ifr_current_if->ifr_name, strerror(errno));
268 /* Skip this interface if it is not up or if this is a loopback one */
269 if( !p_ifr_current_if->ifr_flags & IFF_UP ||
270 p_ifr_current_if->ifr_flags & IFF_LOOPBACK )
273 /* Add an entry to the net_descr struct to store the description of
275 p_net_descr->i_if_number++;
276 p_net_descr->a_if = realloc(p_net_descr->a_if,
277 p_net_descr->i_if_number*sizeof(if_descr_t));
278 /* FIXME: Read the info ?? */
279 i_rc = ReadIfConf(i_sockfd, &p_net_descr->a_if[p_net_descr->i_if_number-1],
280 p_ifr_current_if->ifr_name);
285 /* Don't need the a_ifr_ifconf anymore */
286 free( a_ifr_ifconf );