/* 2. ip was always INADDR_ANY */
int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
{
int fd;
struct sockaddr_in addr;
log1("Opening listen socket on *:%d %s", port, inf);
fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt_reuseaddr(fd);
if (setsockopt_broadcast(fd) == -1)
bb_perror_msg_and_die("SO_BROADCAST");
/* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
if (setsockopt_bindtodevice(fd, inf))
xfunc_die(); /* warning is already printed */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
/* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
return fd;
}
int arping_main(int argc UNUSED_PARAM, char **argv)
{
const char *device = "eth0";
char *source = NULL;
char *target;
unsigned char *packet;
char *err_str;
INIT_G();
sock_fd = xsocket(AF_PACKET, SOCK_DGRAM, 0);
// Drop suid root privileges
// Need to remove SUID_NEVER from applets.h for this to work
//xsetuid(getuid());
err_str = xasprintf("interface %s %%s", device);
{
unsigned opt;
char *str_timeout;
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
opt_complementary = "=1:Df:AU:c+";
opt = getopt32(argv, "DUAqfbc:w:I:s:",
&count, &str_timeout, &device, &source);
if (opt & 0x80) /* -w: timeout */
timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
//if (opt & 0x200) /* -s: source */
option_mask32 &= 0x3f; /* set respective flags */
}
target = argv[optind];
xfunc_error_retval = 2;
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy_IFNAMSIZ(ifr.ifr_name, device);
/* We use ifr.ifr_name in error msg so that problem
* with truncated name will be visible */
ioctl_or_perror_and_die(sock_fd, SIOCGIFINDEX, &ifr, err_str, "not found");
me.sll_ifindex = ifr.ifr_ifindex;
xioctl(sock_fd, SIOCGIFFLAGS, (char *) &ifr);
if (!(ifr.ifr_flags & IFF_UP)) {
bb_error_msg_and_die(err_str, "is down");
}
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
bb_error_msg(err_str, "is not ARPable");
return (option_mask32 & DAD ? 0 : 2);
}
}
/* if (!inet_aton(target, &dst)) - not needed */ {
len_and_sockaddr *lsa;
lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
dst = lsa->u.sin.sin_addr;
if (ENABLE_FEATURE_CLEAN_UP)
free(lsa);
}
if (source && !inet_aton(source, &src)) {
bb_error_msg_and_die("invalid source address %s", source);
}
if ((option_mask32 & (DAD|UNSOLICITED)) == UNSOLICITED && src.s_addr == 0)
src = dst;
if (!(option_mask32 & DAD) || src.s_addr) {
struct sockaddr_in saddr;
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
setsockopt_bindtodevice(probe_fd, device);
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
if (src.s_addr) {
/* Check that this is indeed our IP */
saddr.sin_addr = src;
xbind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
} else { /* !(option_mask32 & DAD) case */
/* Find IP address on this iface */
socklen_t alen = sizeof(saddr);
saddr.sin_port = htons(1025);
saddr.sin_addr = dst;
if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
bb_perror_msg("setsockopt(SO_DONTROUTE)");
xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
bb_perror_msg_and_die("getsockname");
}
if (saddr.sin_family != AF_INET)
bb_error_msg_and_die("no IP address configured");
src = saddr.sin_addr;
}
close(probe_fd);
}
me.sll_family = AF_PACKET;
//me.sll_ifindex = ifindex; - done before
me.sll_protocol = htons(ETH_P_ARP);
xbind(sock_fd, (struct sockaddr *) &me, sizeof(me));
{
socklen_t alen = sizeof(me);
if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1) {
bb_perror_msg_and_die("getsockname");
}
}
if (me.sll_halen == 0) {
bb_error_msg(err_str, "is not ARPable (no ll address)");
return (option_mask32 & DAD ? 0 : 2);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);
if (!(option_mask32 & QUIET)) {
/* inet_ntoa uses static storage, can't use in same printf */
printf("ARPING to %s", inet_ntoa(dst));
printf(" from %s via %s\n", inet_ntoa(src), device);
}
signal_SA_RESTART_empty_mask(SIGINT, (void (*)(int))finish);
signal_SA_RESTART_empty_mask(SIGALRM, (void (*)(int))catcher);
catcher();
packet = xmalloc(4096);
while (1) {
sigset_t sset, osset;
struct sockaddr_ll from;
socklen_t alen = sizeof(from);
int cc;
cc = recvfrom(sock_fd, packet, 4096, 0, (struct sockaddr *) &from, &alen);
if (cc < 0) {
bb_perror_msg("recvfrom");
continue;
}
sigemptyset(&sset);
sigaddset(&sset, SIGALRM);
sigaddset(&sset, SIGINT);
sigprocmask(SIG_BLOCK, &sset, &osset);
recv_pack(packet, cc, &from);
sigprocmask(SIG_SETMASK, &osset, NULL);
}
}
