int main(int argc, char*argv[])
{
int i,f;
char *p;
FILE *fp;
char ** a;
struct ifreq ifr;
struct sockaddr_in*in;
struct rtentry rt;
char * dev = "lo";
struct termios tty;
int speed;
open_raw_socket();
setifaddr(dev, "127.0.0.1");
setifflags(dev, IFF_UP | IFF_RUNNING | IFF_LOOPBACK);
addroute(dev, RTF_UP/* | RTF_HOST*/,
"127.0.0.0" /* dest net */,
"255.0.0.0" /* netmask */,
0 /* gateway */);
close_raw_socket();
}
int dhcp_init_ifc(const char *ifname)
{
dhcp_msg discover_msg;
dhcp_msg request_msg;
dhcp_msg reply;
dhcp_msg *msg;
dhcp_info info;
int s, r, size;
int valid_reply;
uint32_t xid;
unsigned char hwaddr[6];
struct pollfd pfd;
unsigned int state;
unsigned int timeout;
int if_index;
xid = (uint32_t) get_msecs();
if (ifc_get_hwaddr(ifname, hwaddr)) {
return fatal("cannot obtain interface address");
}
if (ifc_get_ifindex(ifname, &if_index)) {
return fatal("cannot obtain interface index");
}
s = open_raw_socket(ifname, hwaddr, if_index);
timeout = TIMEOUT_INITIAL;
state = STATE_SELECTING;
info.type = 0;
goto transmit;
for (;;) {
pfd.fd = s;
pfd.events = POLLIN;
pfd.revents = 0;
r = poll(&pfd, 1, timeout);
if (r == 0) {
#if VERBOSE
printerr("TIMEOUT\n");
#endif
if (timeout >= TIMEOUT_MAX) {
printerr("timed out\n");
if ( info.type == DHCPOFFER ) {
printerr("no acknowledgement from DHCP server\nconfiguring %s with offered parameters\n", ifname);
return dhcp_configure(ifname, &info);
}
errno = ETIME;
close(s);
return -1;
}
timeout = timeout * 2;
transmit:
size = 0;
msg = NULL;
switch(state) {
case STATE_SELECTING:
msg = &discover_msg;
size = init_dhcp_discover_msg(msg, hwaddr, xid);
break;
case STATE_REQUESTING:
msg = &request_msg;
size = init_dhcp_request_msg(msg, hwaddr, xid, info.ipaddr, info.serveraddr);
break;
default:
r = 0;
}
if (size != 0) {
r = send_message(s, if_index, msg, size);
if (r < 0) {
printerr("error sending dhcp msg: %s\n", strerror(errno));
}
}
continue;
}
if (r < 0) {
if ((errno == EAGAIN) || (errno == EINTR)) {
continue;
}
return fatal("poll failed");
}
errno = 0;
r = receive_packet(s, &reply);
if (r < 0) {
if (errno != 0) {
LOGD("receive_packet failed (%d): %s", r, strerror(errno));
if (errno == ENETDOWN || errno == ENXIO) {
return -1;
}
}
continue;
}
#if VERBOSE > 1
dump_dhcp_msg(&reply, r);
#endif
decode_dhcp_msg(&reply, r, &info);
if (state == STATE_SELECTING) {
valid_reply = is_valid_reply(&discover_msg, &reply, r);
} else {
valid_reply = is_valid_reply(&request_msg, &reply, r);
}
if (!valid_reply) {
printerr("invalid reply\n");
continue;
}
if (verbose) dump_dhcp_info(&info);
switch(state) {
case STATE_SELECTING:
if (info.type == DHCPOFFER) {
state = STATE_REQUESTING;
timeout = TIMEOUT_INITIAL;
xid++;
goto transmit;
}
break;
case STATE_REQUESTING:
if (info.type == DHCPACK) {
printerr("configuring %s\n", ifname);
close(s);
return dhcp_configure(ifname, &info);
} else if (info.type == DHCPNAK) {
printerr("configuration request denied\n");
close(s);
return -1;
} else {
printerr("ignoring %s message in state %d\n",
dhcp_type_to_name(info.type), state);
}
break;
}
}
close(s);
return 0;
}
