struct in_addr dst;
struct sockaddr_ll me;
struct sockaddr_ll he;
- int sock;
+ int sock_fd;
int count; // = -1;
unsigned last;
#define dst (G.dst )
#define me (G.me )
#define he (G.he )
-#define sock (G.sock )
+#define sock_fd (G.sock_fd )
#define count (G.count )
#define last (G.last )
#define timeout_us (G.timeout_us)
struct sockaddr_ll *HE)
{
int err;
- unsigned now;
unsigned char buf[256];
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
memcpy(p, dst_addr, 4);
p += 4;
- now = MONOTONIC_US();
- err = sendto(sock, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
+ err = sendto(sock_fd, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
if (err == p - buf) {
- last = now;
+ last = MONOTONIC_US();
sent++;
if (!(option_mask32 & UNICASTING))
brd_sent++;
if (start == 0)
start = now;
- if (count == 0 || (timeout_us && (now - start) > (timeout_us + 500000)))
+ if (count == 0 || (timeout_us && (now - start) > timeout_us))
finish();
/* count < 0 means "infinite count" */
memcpy(&src_ip, p + ah->ar_hln, 4);
memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
if (!(option_mask32 & DAD)) {
- if (src_ip.s_addr != dst.s_addr)
+ if (dst.s_addr != src_ip.s_addr)
return 0;
if (src.s_addr != dst_ip.s_addr)
return 0;
}
if (last) {
- printf(" %u.%03ums\n", last / 1000, last % 1000);
+ unsigned diff = MONOTONIC_US() - last;
+ printf(" %u.%03ums\n", diff / 1000, diff % 1000);
} else {
printf(" UNSOLICITED?\n");
}
int arping_main(int argc, char **argv)
{
const char *device = "eth0";
- int ifindex;
char *source = NULL;
char *target;
unsigned char *packet;
INIT_G();
- sock = xsocket(PF_PACKET, SOCK_DGRAM, 0);
+ sock_fd = xsocket(AF_PACKET, SOCK_DGRAM, 0);
// Drop suid root privileges
- xsetuid(getuid());
+ // Need to remove SUID_NEVER from applets.h for this to work
+ //xsetuid(getuid());
{
unsigned opt;
if (opt & 0x40) /* -c: count */
count = xatoi_u(str_count);
if (opt & 0x80) /* -w: timeout */
- timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000;
+ timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
//if (opt & 0x200) /* -s: source */
option_mask32 &= 0x3f; /* set respective flags */
}
strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name) - 1);
/* We use ifr.ifr_name in error msg so that problem
* with truncated name will be visible */
- ioctl_or_perror_and_die(sock, SIOCGIFINDEX, &ifr, "interface %s not found", ifr.ifr_name);
- ifindex = ifr.ifr_ifindex;
+ ioctl_or_perror_and_die(sock_fd, SIOCGIFINDEX, &ifr, "interface %s not found", ifr.ifr_name);
+ me.sll_ifindex = ifr.ifr_ifindex;
- xioctl(sock, SIOCGIFFLAGS, (char *) &ifr);
+ xioctl(sock_fd, SIOCGIFFLAGS, (char *) &ifr);
if (!(ifr.ifr_flags & IFF_UP)) {
bb_error_msg_and_die("interface %s is down", device);
}
}
- if (!inet_aton(target, &dst)) {
+ /* if (!inet_aton(target, &dst)) - not needed */ {
len_and_sockaddr *lsa;
lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
memcpy(&dst, &lsa->sin.sin_addr.s_addr, 4);
bb_error_msg_and_die("invalid source address %s", source);
}
- if (!(option_mask32 & DAD) && (option_mask32 & UNSOLICITED) && src.s_addr == 0)
+ 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);
- if (device) {
- if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
- bb_perror_msg("cannot bind to device %s", device);
- }
+ if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
+ bb_perror_msg("cannot bind to device %s", 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 if (!(option_mask32 & DAD)) {
+ } else { /* !(option_mask32 & DAD) case */
+ /* Find IP address on this iface */
socklen_t alen = sizeof(saddr);
saddr.sin_port = htons(1025);
bb_perror_msg("setsockopt(SO_DONTROUTE)");
xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
- bb_error_msg_and_die("getsockname");
+ 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;
+ //me.sll_ifindex = ifindex; - done before
me.sll_protocol = htons(ETH_P_ARP);
- xbind(sock, (struct sockaddr *) &me, sizeof(me));
+ xbind(sock_fd, (struct sockaddr *) &me, sizeof(me));
{
socklen_t alen = sizeof(me);
- if (getsockname(sock, (struct sockaddr *) &me, &alen) == -1) {
- bb_error_msg_and_die("getsockname");
+ if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1) {
+ bb_perror_msg_and_die("getsockname");
}
}
if (me.sll_halen == 0) {
he = me;
memset(he.sll_addr, -1, he.sll_halen);
- if (!src.s_addr && !(option_mask32 & DAD)) {
- bb_error_msg_and_die("no src address in the non-DAD mode");
- }
-
if (!(option_mask32 & QUIET)) {
- printf("ARPING to %s from %s via %s\n",
- inet_ntoa(dst), inet_ntoa(src),
- device ? device : "unknown");
+ /* 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);
}
{
socklen_t alen = sizeof(from);
int cc;
- cc = recvfrom(sock, packet, 4096, 0, (struct sockaddr *) &from, &alen);
+ cc = recvfrom(sock_fd, packet, 4096, 0, (struct sockaddr *) &from, &alen);
if (cc < 0) {
bb_perror_msg("recvfrom");
continue;
#define MONOTONIC_US() ((unsigned)monotonic_us())
struct arp_packet {
- struct ether_header hdr;
+ struct ether_header eth;
struct ether_arp arp;
} ATTRIBUTE_PACKED;
DEFEND
};
-#define VDBG(fmt,args...) \
- do { } while (0)
+#define VDBG(...) do { } while (0)
+
+
+enum {
+ sock_fd = 3
+};
+
+struct globals {
+ char *intf;
+ struct sockaddr saddr;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define intf (G.intf )
+#define saddr (G.saddr)
+
/**
* Pick a random link local IP address on 169.254/16, except that
/**
* Broadcast an ARP packet.
*/
-static void arp(int fd, struct sockaddr *saddr, int op,
- const struct ether_addr *source_addr, struct in_addr source_ip,
- const struct ether_addr *target_addr, struct in_addr target_ip)
+static void arp(int op,
+ const struct ether_addr *source_eth, struct in_addr source_ip,
+ const struct ether_addr *target_eth, struct in_addr target_ip)
{
struct arp_packet p;
memset(&p, 0, sizeof(p));
// ether header
- p.hdr.ether_type = htons(ETHERTYPE_ARP);
- memcpy(p.hdr.ether_shost, source_addr, ETH_ALEN);
- memset(p.hdr.ether_dhost, 0xff, ETH_ALEN);
+ p.eth.ether_type = htons(ETHERTYPE_ARP);
+ memcpy(p.eth.ether_shost, source_eth, ETH_ALEN);
+ memset(p.eth.ether_dhost, 0xff, ETH_ALEN);
// arp request
p.arp.arp_hrd = htons(ARPHRD_ETHER);
p.arp.arp_hln = ETH_ALEN;
p.arp.arp_pln = 4;
p.arp.arp_op = htons(op);
- memcpy(&p.arp.arp_sha, source_addr, ETH_ALEN);
+ memcpy(&p.arp.arp_sha, source_eth, ETH_ALEN);
memcpy(&p.arp.arp_spa, &source_ip, sizeof(p.arp.arp_spa));
- memcpy(&p.arp.arp_tha, target_addr, ETH_ALEN);
+ memcpy(&p.arp.arp_tha, target_eth, ETH_ALEN);
memcpy(&p.arp.arp_tpa, &target_ip, sizeof(p.arp.arp_tpa));
// send it
- xsendto(fd, &p, sizeof(p), saddr, sizeof(*saddr));
+ xsendto(sock_fd, &p, sizeof(p), &saddr, sizeof(saddr));
// Currently all callers ignore errors, that's why returns are
// commented out...
/**
* Run a script. argv[2] is already NULL.
*/
-static int run(char *argv[3], const char *intf, struct in_addr *ip)
+static int run(char *argv[3], struct in_addr *ip)
{
int status;
+ char *addr = addr; /* for gcc */
+ const char *fmt = "%s %s %s" + 3;
VDBG("%s run %s %s\n", intf, argv[0], argv[1]);
if (ip) {
- char *addr = inet_ntoa(*ip);
+ addr = inet_ntoa(*ip);
setenv("ip", addr, 1);
- bb_info_msg("%s %s %s", argv[1], intf, addr);
+ fmt -= 3;
}
+ bb_info_msg(fmt, argv[1], intf, addr);
status = wait4pid(spawn(argv));
if (status < 0) {
- bb_perror_msg("%s %s", argv[1], intf);
+ bb_perror_msg("%s %s %s" + 3, argv[1], intf);
return -errno;
}
if (status != 0)
/**
* Return milliseconds of random delay, up to "secs" seconds.
*/
-static unsigned ALWAYS_INLINE ms_rdelay(unsigned secs)
+static unsigned ALWAYS_INLINE random_delay_ms(unsigned secs)
{
return rand() % (secs * 1000);
}
int zcip_main(int argc, char **argv)
{
int state = PROBE;
- /* Prevent unaligned traps for ARM (see srand() below) */
- struct ether_addr eth_addr __attribute__(( aligned(sizeof(unsigned)) ));
+ struct ether_addr eth_addr;
const char *why;
- int fd;
char *r_opt;
unsigned opts;
struct {
const struct in_addr null_ip;
const struct ether_addr null_addr;
- struct sockaddr saddr;
struct in_addr ip;
struct ifreq ifr;
- char *intf;
char *script_av[3];
int timeout_ms; /* must be signed */
unsigned conflicts;
} L;
#define null_ip (L.null_ip )
#define null_addr (L.null_addr )
-#define saddr (L.saddr )
#define ip (L.ip )
#define ifr (L.ifr )
-#define intf (L.intf )
#define script_av (L.script_av )
#define timeout_ms (L.timeout_ms)
#define conflicts (L.conflicts )
// initialize the interface (modprobe, ifup, etc)
script_av[1] = (char*)"init";
- if (run(script_av, intf, NULL))
+ if (run(script_av, NULL))
return EXIT_FAILURE;
// initialize saddr
+ // saddr is: { u16 sa_family; u8 sa_data[14]; }
//memset(&saddr, 0, sizeof(saddr));
+ //TODO: are we leaving sa_family == 0 (AF_UNSPEC)?!
safe_strncpy(saddr.sa_data, intf, sizeof(saddr.sa_data));
// open an ARP socket
- fd = xsocket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP));
+ xmove_fd(xsocket(AF_PACKET, SOCK_PACKET, htons(ETH_P_ARP)), sock_fd);
// bind to the interface's ARP socket
- xbind(fd, &saddr, sizeof(saddr));
+ xbind(sock_fd, &saddr, sizeof(saddr));
// get the interface's ethernet address
//memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, intf, sizeof(ifr.ifr_name));
- xioctl(fd, SIOCGIFHWADDR, &ifr);
+ xioctl(sock_fd, SIOCGIFHWADDR, &ifr);
memcpy(ð_addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
// start with some stable ip address, either a function of
// the hardware address or else the last address we used.
+ // we are taking low-order four bytes, as top-order ones
+ // aren't random enough.
// NOTE: the sequence of addresses we try changes only
// depending on when we detect conflicts.
- srand(*(unsigned*)ð_addr);
+ {
+ uint32_t t;
+ memcpy(&t, (char*)ð_addr + 2, 4);
+ srand(t);
+ }
if (ip.s_addr == 0)
pick(&ip);
struct pollfd fds[1];
unsigned deadline_us;
struct arp_packet p;
+ int source_ip_conflict;
+ int target_ip_conflict;
- int source_ip_conflict = 0;
- int target_ip_conflict = 0;
-
- fds[0].fd = fd;
+ fds[0].fd = sock_fd;
fds[0].events = POLLIN;
fds[0].revents = 0;
// poll, being ready to adjust current timeout
if (!timeout_ms) {
- timeout_ms = ms_rdelay(PROBE_WAIT);
- // FIXME setsockopt(fd, SO_ATTACH_FILTER, ...) to
+ timeout_ms = random_delay_ms(PROBE_WAIT);
+ // FIXME setsockopt(sock_fd, SO_ATTACH_FILTER, ...) to
// make the kernel filter out all packets except
// ones we'd care about.
}
VDBG("...wait %d %s nprobes=%u, nclaims=%u\n",
timeout_ms, intf, nprobes, nclaims);
+ // FIXME: do we really receive ALL packets here??
+ // if yes, set up filtering to get ARPs only!!! (see arping)
switch (safe_poll(fds, 1, timeout_ms)) {
default:
nprobes++;
VDBG("probe/%u %s@%s\n",
nprobes, intf, inet_ntoa(ip));
- arp(fd, &saddr, ARPOP_REQUEST,
+ arp(ARPOP_REQUEST,
ð_addr, null_ip,
&null_addr, ip);
timeout_ms = PROBE_MIN * 1000;
- timeout_ms += ms_rdelay(PROBE_MAX - PROBE_MIN);
+ timeout_ms += random_delay_ms(PROBE_MAX - PROBE_MIN);
}
else {
// Switch to announce state.
nclaims = 0;
VDBG("announce/%u %s@%s\n",
nclaims, intf, inet_ntoa(ip));
- arp(fd, &saddr, ARPOP_REQUEST,
+ arp(ARPOP_REQUEST,
ð_addr, ip,
ð_addr, ip);
timeout_ms = ANNOUNCE_INTERVAL * 1000;
nclaims = 0;
VDBG("announce/%u %s@%s\n",
nclaims, intf, inet_ntoa(ip));
- arp(fd, &saddr, ARPOP_REQUEST,
+ arp(ARPOP_REQUEST,
ð_addr, ip,
ð_addr, ip);
timeout_ms = ANNOUNCE_INTERVAL * 1000;
nclaims++;
VDBG("announce/%u %s@%s\n",
nclaims, intf, inet_ntoa(ip));
- arp(fd, &saddr, ARPOP_REQUEST,
+ arp(ARPOP_REQUEST,
ð_addr, ip,
ð_addr, ip);
timeout_ms = ANNOUNCE_INTERVAL * 1000;
// link is ok to use earlier
// FIXME update filters
script_av[1] = (char*)"config";
- run(script_av, intf, &ip);
+ run(script_av, &ip);
ready = 1;
conflicts = 0;
timeout_ms = -1; // Never timeout in the monitor state.
} // switch (state)
break; // case 0 (timeout)
- // packets arriving
+ // packets arriving, or link went down
case 1:
// We need to adjust the timeout in case we didn't receive
// a conflicting packet.
timeout_ms = 0;
} else {
VDBG("adjusting timeout\n");
- timeout_ms = diff / 1000;
- if (!timeout_ms) timeout_ms = 1;
+ timeout_ms = (diff / 1000) | 1; /* never 0 */
}
}
if (fds[0].revents & POLLERR) {
// FIXME: links routinely go down;
// this shouldn't necessarily exit.
- bb_error_msg("%s: poll error", intf);
+ bb_error_msg("iface %s is down", intf);
if (ready) {
script_av[1] = (char*)"deconfig";
- run(script_av, intf, &ip);
+ run(script_av, &ip);
}
return EXIT_FAILURE;
}
}
// read ARP packet
- if (recv(fd, &p, sizeof(p), 0) < 0) {
+ if (safe_read(sock_fd, &p, sizeof(p)) < 0) {
why = "recv";
goto bad;
}
- if (p.hdr.ether_type != htons(ETHERTYPE_ARP))
+ if (p.eth.ether_type != htons(ETHERTYPE_ARP))
continue;
-
#ifdef DEBUG
{
- struct ether_addr * sha = (struct ether_addr *) p.arp.arp_sha;
- struct ether_addr * tha = (struct ether_addr *) p.arp.arp_tha;
- struct in_addr * spa = (struct in_addr *) p.arp.arp_spa;
- struct in_addr * tpa = (struct in_addr *) p.arp.arp_tpa;
+ struct ether_addr *sha = (struct ether_addr *) p.arp.arp_sha;
+ struct ether_addr *tha = (struct ether_addr *) p.arp.arp_tha;
+ struct in_addr *spa = (struct in_addr *) p.arp.arp_spa;
+ struct in_addr *tpa = (struct in_addr *) p.arp.arp_tpa;
VDBG("%s recv arp type=%d, op=%d,\n",
- intf, ntohs(p.hdr.ether_type),
+ intf, ntohs(p.eth.ether_type),
ntohs(p.arp.arp_op));
VDBG("\tsource=%s %s\n",
ether_ntoa(sha),
}
#endif
if (p.arp.arp_op != htons(ARPOP_REQUEST)
- && p.arp.arp_op != htons(ARPOP_REPLY))
+ && p.arp.arp_op != htons(ARPOP_REPLY))
continue;
- if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0 &&
- memcmp(ð_addr, &p.arp.arp_sha, ETH_ALEN) != 0) {
+ source_ip_conflict = 0;
+ target_ip_conflict = 0;
+
+ if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0
+ && memcmp(&p.arp.arp_sha, ð_addr, ETH_ALEN) != 0
+ ) {
source_ip_conflict = 1;
}
- if (memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0 &&
- p.arp.arp_op == htons(ARPOP_REQUEST) &&
- memcmp(ð_addr, &p.arp.arp_tha, ETH_ALEN) != 0) {
+ if (p.arp.arp_op == htons(ARPOP_REQUEST)
+ && memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0
+ && memcmp(&p.arp.arp_tha, ð_addr, ETH_ALEN) != 0
+ ) {
target_ip_conflict = 1;
}
VDBG("monitor conflict -- defending\n");
state = DEFEND;
timeout_ms = DEFEND_INTERVAL * 1000;
- arp(fd, &saddr,
- ARPOP_REQUEST,
- ð_addr, ip,
- ð_addr, ip);
+ arp(ARPOP_REQUEST,
+ ð_addr, ip,
+ ð_addr, ip);
}
break;
case DEFEND:
VDBG("defend conflict -- starting over\n");
ready = 0;
script_av[1] = (char*)"deconfig";
- run(script_av, intf, &ip);
+ run(script_av, &ip);
// restart the whole protocol
pick(&ip);
} // switch poll
} // while (1)
bad:
- bb_perror_msg("%s, %s", intf, why);
+ bb_perror_msg("%s: %s", intf, why);
return EXIT_FAILURE;
}
projects / platform / upstream / busybox.git / commitdiff