X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Farping.c;h=e3418a9459bbe0a781b0fbaa38a91ff6db7cabcf;hb=2e36eb8f273f4542a473b71a1a5c399d729acf54;hp=f84c8a75c5669df9b2da239261465b5e633ee9b6;hpb=40920825d59874cf285390434486e88c8498d2d8;p=oweals%2Fbusybox.git diff --git a/networking/arping.c b/networking/arping.c index f84c8a75c..e3418a945 100644 --- a/networking/arping.c +++ b/networking/arping.c @@ -8,181 +8,192 @@ * Busybox port: Nick Fedchik */ -#include -#include - -#include -#include -#include -#include - #include #include #include #include -#include "busybox.h" - -static struct in_addr src; -static struct in_addr dst; -static struct sockaddr_ll me; -static struct sockaddr_ll he; -static struct timeval last; - -enum cfg_e { - dad = 1, - unsolicited = 2, - advert = 4, - quiet = 8, - quit_on_reply = 16, - broadcast_only = 32, - unicasting = 64 +#include "libbb.h" + +/* We don't expect to see 1000+ seconds delay, unsigned is enough */ +#define MONOTONIC_US() ((unsigned)monotonic_us()) + +enum { + DAD = 1, + UNSOLICITED = 2, + ADVERT = 4, + QUIET = 8, + QUIT_ON_REPLY = 16, + BCAST_ONLY = 32, + UNICASTING = 64 }; -static int cfg; - -static int s; -static int count = -1; -static int timeout; -static int sent; -static int brd_sent; -static int received; -static int brd_recv; -static int req_recv; - - -#define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \ - ((tv1).tv_usec-(tv2).tv_usec)/1000 ) -static int send_pack(int sock, struct in_addr *src_addr, - struct in_addr *dst_addr, struct sockaddr_ll *ME, - struct sockaddr_ll *HE) + +struct globals { + struct in_addr src; + struct in_addr dst; + struct sockaddr_ll me; + struct sockaddr_ll he; + int sock_fd; + + int count; // = -1; + unsigned last; + unsigned timeout_us; + unsigned start; + + unsigned sent; + unsigned brd_sent; + unsigned received; + unsigned brd_recv; + unsigned req_recv; +}; +#define G (*(struct globals*)&bb_common_bufsiz1) +#define src (G.src ) +#define dst (G.dst ) +#define me (G.me ) +#define he (G.he ) +#define sock_fd (G.sock_fd ) +#define count (G.count ) +#define last (G.last ) +#define timeout_us (G.timeout_us) +#define start (G.start ) +#define sent (G.sent ) +#define brd_sent (G.brd_sent ) +#define received (G.received ) +#define brd_recv (G.brd_recv ) +#define req_recv (G.req_recv ) +#define INIT_G() do { \ + count = -1; \ +} while (0) + +// If GNUisms are not available... +//static void *mempcpy(void *_dst, const void *_src, int n) +//{ +// memcpy(_dst, _src, n); +// return (char*)_dst + n; +//} + +static int send_pack(struct in_addr *src_addr, + struct in_addr *dst_addr, struct sockaddr_ll *ME, + struct sockaddr_ll *HE) { int err; - struct timeval now; - RESERVE_CONFIG_UBUFFER(buf, 256); + unsigned char buf[256]; struct arphdr *ah = (struct arphdr *) buf; unsigned char *p = (unsigned char *) (ah + 1); - ah->ar_hrd = htons(ME->sll_hatype); ah->ar_hrd = htons(ARPHRD_ETHER); ah->ar_pro = htons(ETH_P_IP); ah->ar_hln = ME->sll_halen; ah->ar_pln = 4; - ah->ar_op = cfg&advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST); - - memcpy(p, &ME->sll_addr, ah->ar_hln); - p += ME->sll_halen; + ah->ar_op = option_mask32 & ADVERT ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST); - memcpy(p, src_addr, 4); - p += 4; + p = mempcpy(p, &ME->sll_addr, ah->ar_hln); + p = mempcpy(p, src_addr, 4); - if (cfg&advert) - memcpy(p, &ME->sll_addr, ah->ar_hln); + if (option_mask32 & ADVERT) + p = mempcpy(p, &ME->sll_addr, ah->ar_hln); else - memcpy(p, &HE->sll_addr, ah->ar_hln); - p += ah->ar_hln; + p = mempcpy(p, &HE->sll_addr, ah->ar_hln); - memcpy(p, dst_addr, 4); - p += 4; + p = mempcpy(p, dst_addr, 4); - gettimeofday(&now, NULL); - 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 (!(cfg&unicasting)) + if (!(option_mask32 & UNICASTING)) brd_sent++; } - RELEASE_CONFIG_BUFFER(buf); return err; } +static void finish(void) NORETURN; static void finish(void) { - if (!(cfg&quiet)) { - printf("Sent %d probes (%d broadcast(s))\n" - "Received %d repl%s", + if (!(option_mask32 & QUIET)) { + printf("Sent %u probe(s) (%u broadcast(s))\n" + "Received %u repl%s" + " (%u request(s), %u broadcast(s))\n", sent, brd_sent, - received, (received > 1) ? "ies" : "y"); - if (brd_recv || req_recv) { - printf(" ("); - if (req_recv) - printf("%d request(s)", req_recv); - if (brd_recv) - printf("%s%d broadcast(s)", req_recv ? ", " : "", brd_recv); - putchar(')'); - } - putchar('\n'); - fflush(stdout); + received, (received == 1) ? "ies" : "y", + req_recv, brd_recv); } - if (cfg&dad) + if (option_mask32 & DAD) exit(!!received); - if (cfg&unsolicited) - exit(0); + if (option_mask32 & UNSOLICITED) + exit(EXIT_SUCCESS); exit(!received); } static void catcher(void) { - struct timeval tv; - static struct timeval start; - - gettimeofday(&tv, NULL); + unsigned now; - if (start.tv_sec == 0) - start = tv; + now = MONOTONIC_US(); + if (start == 0) + start = now; - if (count-- == 0 - || (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500)) + if (count == 0 || (timeout_us && (now - start) > timeout_us)) finish(); - if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) { - send_pack(s, &src, &dst, &me, &he); - if (count == 0 && cfg&unsolicited) + /* count < 0 means "infinite count" */ + if (count > 0) + count--; + + if (last == 0 || (now - last) > 500000) { + send_pack(&src, &dst, &me, &he); + if (count == 0 && (option_mask32 & UNSOLICITED)) finish(); } alarm(1); } -static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) +static bool recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) { struct arphdr *ah = (struct arphdr *) buf; unsigned char *p = (unsigned char *) (ah + 1); struct in_addr src_ip, dst_ip; + /* moves below assume in_addr is 4 bytes big, ensure that */ + struct BUG_in_addr_must_be_4 { + char BUG_in_addr_must_be_4[ + sizeof(struct in_addr) == 4 ? 1 : -1 + ]; + char BUG_s_addr_must_be_4[ + sizeof(src_ip.s_addr) == 4 ? 1 : -1 + ]; + }; /* Filter out wild packets */ - if (FROM->sll_pkttype != PACKET_HOST && - FROM->sll_pkttype != PACKET_BROADCAST && - FROM->sll_pkttype != PACKET_MULTICAST) - return 0; + if (FROM->sll_pkttype != PACKET_HOST + && FROM->sll_pkttype != PACKET_BROADCAST + && FROM->sll_pkttype != PACKET_MULTICAST) + return false; - /* Only these types are recognised */ + /* Only these types are recognized */ if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY)) - return 0; + return false; /* ARPHRD check and this darned FDDI hack here :-( */ - if (ah->ar_hrd != htons(FROM->sll_hatype) && - (FROM->sll_hatype != ARPHRD_FDDI - || ah->ar_hrd != htons(ARPHRD_ETHER))) - return 0; + if (ah->ar_hrd != htons(FROM->sll_hatype) + && (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER))) + return false; /* Protocol must be IP. */ - if (ah->ar_pro != htons(ETH_P_IP)) - return 0; - if (ah->ar_pln != 4) - return 0; - if (ah->ar_hln != me.sll_halen) - return 0; - if (len < sizeof(*ah) + 2 * (4 + ah->ar_hln)) - return 0; - memcpy(&src_ip, p + ah->ar_hln, 4); - memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4); - if (!(cfg&dad)) { - if (src_ip.s_addr != dst.s_addr) - return 0; - if (src.s_addr != dst_ip.s_addr) - return 0; - if (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln)) - return 0; + if (ah->ar_pro != htons(ETH_P_IP) + || (ah->ar_pln != 4) + || (ah->ar_hln != me.sll_halen) + || (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln)))) + return false; + + move_from_unaligned32(src_ip.s_addr, p + ah->ar_hln); + move_from_unaligned32(dst_ip.s_addr, p + ah->ar_hln + 4 + ah->ar_hln); + + if (dst.s_addr != src_ip.s_addr) + return false; + if (!(option_mask32 & DAD)) { + if ((src.s_addr != dst_ip.s_addr) + || (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln))) + return false; } else { /* DAD packet was: src_ip = 0 (or some src) @@ -197,22 +208,16 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) also that it matches to dst_ip, otherwise dst_ip/dst_hw do not matter. */ - if (src_ip.s_addr != dst.s_addr) - return 0; - if (memcmp(p, &me.sll_addr, me.sll_halen) == 0) - return 0; - if (src.s_addr && src.s_addr != dst_ip.s_addr) - return 0; + if ((memcmp(p, &me.sll_addr, me.sll_halen) == 0) + || (src.s_addr && src.s_addr != dst_ip.s_addr)) + return false; } - if (!(cfg&quiet)) { + if (!(option_mask32 & QUIET)) { int s_printed = 0; - struct timeval tv; - gettimeofday(&tv, NULL); - - printf("%s %s from %s [%s]", - FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast", - ah->ar_op == htons(ARPOP_REPLY) ? "reply" : "request", + printf("%scast re%s from %s [%s]", + FROM->sll_pkttype == PACKET_HOST ? "Uni" : "Broad", + ah->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest", inet_ntoa(src_ip), ether_ntoa((struct ether_addr *) p)); if (dst_ip.s_addr != src.s_addr) { @@ -223,77 +228,66 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) if (!s_printed) printf("for "); printf("[%s]", - ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4)); + ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4)); } - if (last.tv_sec) { - long usecs = (tv.tv_sec - last.tv_sec) * 1000000 + - tv.tv_usec - last.tv_usec; - long msecs = (usecs + 500) / 1000; - - usecs -= msecs * 1000 - 500; - printf(" %ld.%03ldms\n", msecs, usecs); + if (last) { + unsigned diff = MONOTONIC_US() - last; + printf(" %u.%03ums\n", diff / 1000, diff % 1000); } else { printf(" UNSOLICITED?\n"); } - fflush(stdout); + fflush_all(); } received++; if (FROM->sll_pkttype != PACKET_HOST) brd_recv++; if (ah->ar_op == htons(ARPOP_REQUEST)) req_recv++; - if (cfg&quit_on_reply) + if (option_mask32 & QUIT_ON_REPLY) finish(); - if (!(cfg&broadcast_only)) { + if (!(option_mask32 & BCAST_ONLY)) { memcpy(he.sll_addr, p, me.sll_halen); - cfg |= unicasting; + option_mask32 |= UNICASTING; } - return 1; + return true; } -int arping_main(int argc, char **argv) +int arping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int arping_main(int argc UNUSED_PARAM, char **argv) { - char *device = "eth0"; - int ifindex; + const char *device = "eth0"; char *source = NULL; char *target; + unsigned char *packet; + char *err_str; - s = xsocket(PF_PACKET, SOCK_DGRAM, 0); + INIT_G(); + + 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()); + err_str = xasprintf("interface %s %%s", device); { - unsigned long opt; - char *_count, *_timeout; + unsigned opt; + char *str_timeout; /* Dad also sets quit_on_reply. * Advert also sets unsolicited. */ - bb_opt_complementally = "Df:AU"; - opt = bb_getopt_ulflags(argc, argv, "DUAqfbc:w:i:s:", - &_count, &_timeout, &device, &source); - cfg |= opt & 0x3f; /* set respective flags */ - if (opt & 0x40) /* -c: count */ - count = atoi(_count); + opt_complementary = "=1:Df:AU:c+"; + opt = getopt32(argv, "DUAqfbc:w:I:s:", + &count, &str_timeout, &device, &source); if (opt & 0x80) /* -w: timeout */ - timeout = atoi(_timeout); - if (opt & 0x100) { /* -i: interface */ - if (strlen(device) > IF_NAMESIZE) { - bb_error_msg_and_die("interface name '%s' is too long", - device); - } - } + timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000; //if (opt & 0x200) /* -s: source */ + option_mask32 &= 0x3f; /* set respective flags */ } - argc -= optind; - argv += optind; - if (argc != 1) - bb_show_usage(); - - target = *argv; + target = argv[optind]; xfunc_error_retval = 2; @@ -301,137 +295,109 @@ int arping_main(int argc, char **argv) struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); - strncpy(ifr.ifr_name, device, IFNAMSIZ - 1); - if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { - bb_error_msg_and_die("interface %s not found", device); - } - ifindex = ifr.ifr_ifindex; + 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 (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) { - bb_error_msg_and_die("SIOCGIFFLAGS"); - } if (!(ifr.ifr_flags & IFF_UP)) { - bb_error_msg_and_die("interface %s is down", device); + bb_error_msg_and_die(err_str, "is down"); } if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) { - bb_error_msg("interface %s is not ARPable", device); - exit(cfg&dad ? 0 : 2); + bb_error_msg(err_str, "is not ARPable"); + return (option_mask32 & DAD ? 0 : 2); } } - if (!inet_aton(target, &dst)) { - struct hostent *hp; - - hp = gethostbyname2(target, AF_INET); - if (!hp) { - bb_error_msg_and_die("invalid or unknown target %s", target); - } - memcpy(&dst, hp->h_addr, 4); + /* 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 (!(cfg&dad) && cfg&unsolicited && src.s_addr == 0) + if ((option_mask32 & (DAD|UNSOLICITED)) == UNSOLICITED && src.s_addr == 0) src = dst; - if (!(cfg&dad) || src.s_addr) { + 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_error_msg("warning: interface %s is ignored", device); - } + 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; - if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) { - bb_error_msg_and_die("bind"); - } - } else if (!(cfg&dad)) { - int on = 1; + 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, (char *) &on, - sizeof(on)) == -1) - bb_perror_msg("warning: setsockopt(SO_DONTROUTE)"); - if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) - == -1) { - bb_error_msg_and_die("connect"); - } - if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == - -1) { - bb_error_msg_and_die("getsockname"); - } + 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)); + getsockname(probe_fd, (struct sockaddr *) &saddr, &alen); + //never happens: + //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; + //me.sll_ifindex = ifindex; - done before me.sll_protocol = htons(ETH_P_ARP); - if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) { - bb_error_msg_and_die("bind"); - } + xbind(sock_fd, (struct sockaddr *) &me, sizeof(me)); { socklen_t alen = sizeof(me); - - if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) { - bb_error_msg_and_die("getsockname"); - } + getsockname(sock_fd, (struct sockaddr *) &me, &alen); + //never happens: + //if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1) + // bb_perror_msg_and_die("getsockname"); } if (me.sll_halen == 0) { - bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device); - exit(cfg&dad ? 0 : 2); + 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 (!(cfg&quiet)) { - printf("ARPING to %s from %s via %s\n", - inet_ntoa(dst), inet_ntoa(src), - device ? device : "unknown"); - } - - if (!src.s_addr && !(cfg&dad)) { - bb_error_msg_and_die("no src address in the non-DAD mode"); + 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); } - { - struct sigaction sa; - - memset(&sa, 0, sizeof(sa)); - sa.sa_flags = SA_RESTART; - - sa.sa_handler = (void (*)(int)) finish; - sigaction(SIGINT, &sa, NULL); - - sa.sa_handler = (void (*)(int)) catcher; - sigaction(SIGALRM, &sa, NULL); - } + 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; - RESERVE_CONFIG_UBUFFER(packet, 4096); struct sockaddr_ll from; socklen_t alen = sizeof(from); int cc; - if ((cc = recvfrom(s, packet, 4096, 0, - (struct sockaddr *) &from, &alen)) < 0) { + cc = recvfrom(sock_fd, packet, 4096, 0, (struct sockaddr *) &from, &alen); + if (cc < 0) { bb_perror_msg("recvfrom"); continue; } @@ -441,6 +407,5 @@ int arping_main(int argc, char **argv) sigprocmask(SIG_BLOCK, &sset, &osset); recv_pack(packet, cc, &from); sigprocmask(SIG_SETMASK, &osset, NULL); - RELEASE_CONFIG_BUFFER(packet); } }