void host_init(char *ifname)
{
struct sockaddr_in *ina;
char buf[1024], tmp_ifname[IFNAMSIZ],
ifnames[(IFNAMSIZ + 1) * MAX_NR_INTERFACES], *iface;
struct ifconf ifc;
struct ifreq ifreq, *ifr;
int i, iw_sock, if_sock = 0;
memset(&this_host, 0, sizeof(struct host_info));
memset(dev_indices, 0, sizeof(unsigned int) * MAX_NR_INTERFACES);
if (!ifname) {
/* No interface was given... search for first wireless. */
iw_sock = socket(PF_INET, SOCK_DGRAM, 0);
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(iw_sock, SIOCGIFCONF, &ifc) < 0) {
fprintf(stderr, "Could not get wireless info\n");
exit(-1);
}
ifr = ifc.ifc_req;
for (i = ifc.ifc_len / sizeof(struct ifreq); i >= 0; i--, ifr++) {
struct iwreq req;
strcpy(req.ifr_name, ifr->ifr_name);
if (ioctl(iw_sock, SIOCGIWNAME, &req) >= 0) {
strcpy(tmp_ifname, ifr->ifr_name);
break;
}
}
/* Did we find a wireless interface? */
if (!strlen(tmp_ifname)) {
fprintf(stderr, "\nCould not find a wireless interface!\n");
fprintf(stderr, "Use -i <interface> to override...\n\n");
exit(-1);
}
strcpy(ifreq.ifr_name, tmp_ifname);
if (ioctl(iw_sock, SIOCGIFINDEX, &ifreq) < 0) {
alog(LOG_ERR, errno, __FUNCTION__,
"Could not get index of %s", tmp_ifname);
close(if_sock);
exit(-1);
}
close(iw_sock);
ifname = tmp_ifname;
alog(LOG_NOTICE, 0, __FUNCTION__,
"Attaching to %s, override with -i <if1,if2,...>.", tmp_ifname);
}
strcpy(ifnames, ifname);
/* Intitialize the local sequence number an rreq_id to zero */
this_host.seqno = 1;
this_host.rreq_id = 0;
/* Zero interfaces enabled so far... */
this_host.nif = 0;
gettimeofday(&this_host.bcast_time, NULL);
/* Find the indices of all interfaces to broadcast on... */
if_sock = socket(AF_INET, SOCK_DGRAM, 0);
iface = strtok(ifname, ",");
/* OK, now lookup interface information, and store it... */
do {
strcpy(ifreq.ifr_name, iface);
if (ioctl(if_sock, SIOCGIFINDEX, &ifreq) < 0) {
alog(LOG_ERR, errno, __FUNCTION__, "Could not get index of %s",
iface);
close(if_sock);
exit(-1);
}
this_host.devs[this_host.nif].ifindex = ifreq.ifr_ifindex;
dev_indices[this_host.nif++] = ifreq.ifr_ifindex;
strcpy(DEV_IFINDEX(ifreq.ifr_ifindex).ifname, iface);
/* Get IP-address of interface... */
ina = get_if_info(iface, SIOCGIFADDR);
if (ina == NULL)
exit(-1);
DEV_IFINDEX(ifreq.ifr_ifindex).ipaddr = ina->sin_addr;
/* Get netmask of interface... */
ina = get_if_info(iface, SIOCGIFNETMASK);
if (ina == NULL)
exit(-1);
DEV_IFINDEX(ifreq.ifr_ifindex).netmask = ina->sin_addr;
ina = get_if_info(iface, SIOCGIFBRDADDR);
if (ina == NULL)
exit(-1);
DEV_IFINDEX(ifreq.ifr_ifindex).broadcast = ina->sin_addr;
DEV_IFINDEX(ifreq.ifr_ifindex).enabled = 1;
if (this_host.nif >= MAX_NR_INTERFACES)
break;
} while ((iface = strtok(NULL, ",")));
close(if_sock);
/* Load kernel modules */
load_modules(ifnames);
/* Enable IP forwarding and set other kernel options... */
if (set_kernel_options() < 0) {
fprintf(stderr, "Could not set kernel options!\n");
exit(-1);
}
}
void host_init(char *ifname) {
static struct local_host_info host_info;
struct sockaddr_in *ina;
char buf[1024];
struct ifconf ifc;
struct ifreq *ifr;
int i, iw_sock;
/* Make sure the global "this_host" pointer points to the info
structure so that the information can be accessed from
outside this function... */
memset(&host_info, '\0', sizeof(struct local_host_info));
this_host = &host_info;
/* Find the first wireless interface */
if(ifname != NULL)
strcpy(host_info.ifname, ifname);
else {
iw_sock= socket(AF_INET, SOCK_DGRAM, 0);
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if(ioctl(iw_sock, SIOCGIFCONF, &ifc) < 0) {
fprintf(stderr, "Could not get wireless info\n");
exit(-1);
}
ifr = ifc.ifc_req;
for(i = ifc.ifc_len / sizeof(struct ifreq); i >= 0; i--, ifr++) {
struct iwreq req;
strcpy(req.ifr_name, ifr->ifr_name);
if (ioctl(iw_sock, SIOCGIWNAME, &req) >= 0) {
strcpy(host_info.ifname, ifr->ifr_name);
break;
}
}
close(iw_sock);
/* Did we find a wireless interface? */
if(host_info.ifname[0] == '\0') {
fprintf(stderr, "Could not find a wireless interface!\n");
fprintf(stderr, "Use -i <interface> to override...\n");
exit(-1);
}
}
/* Load required kernel modules */
load_modules(host_info.ifname);
/* Get IP-address of interface... */
ina = get_if_info(host_info.ifname, SIOCGIFADDR);
if(ina == NULL)
exit(-1);
/* Remember our host IP address... */
host_info.ipaddr = ntohl(ina->sin_addr.s_addr);
/* printf("Address of interface %s is %s\n", host_info.ifname, */
/* ip_to_str(host_info.ipaddr)); */
/* Get netmask of interface... */
ina = get_if_info(host_info.ifname, SIOCGIFNETMASK);
if(ina == NULL)
exit(-1);
/* Remember the netmask */
host_info.netmask = ntohl(ina->sin_addr.s_addr);
/* printf("Netmask of interface %s is %s\n", host_info.ifname, */
/* ip_to_str(host_info.netmask)); */
ina = get_if_info(host_info.ifname, SIOCGIFBRDADDR);
if(ina == NULL)
exit(-1);
host_info.broadcast = ntohl(ina->sin_addr.s_addr);
/* printf("Broadcast address is %s\n", ip_to_str(host_info.broadcast)); */
/* Enable IP forwarding and set other kernel options... */
if(set_kernel_options(host_info.ifname) < 0) {
fprintf(stderr, "Could not set kernel options!\n");
exit(-1);
}
/* Add broadcast route (255.255.255.255) */
k_add_rte(AODV_BROADCAST, 0, 0, 0);
/* Intitialize the local sequence number an flood_id to zero */
host_info.seqno = 0;
host_info.flood_id = 0;
}
