diff options
-rw-r--r-- | networking/arping.c | 150 |
1 files changed, 69 insertions, 81 deletions
diff --git a/networking/arping.c b/networking/arping.c index b30cb535e..90a03a58e 100644 --- a/networking/arping.c +++ b/networking/arping.c @@ -1,10 +1,8 @@ +/* vi:set ts=4:*/ /* * arping.c - Ping hosts by ARP requests/replies * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> * Busybox port: Nick Fedchik <nick@fedchik.org.ua> @@ -26,29 +24,32 @@ #include "busybox.h" -#define APPLET_NAME "arping" - static struct in_addr src; static struct in_addr dst; static struct sockaddr_ll me; static struct sockaddr_ll he; static struct timeval last; -static int dad; -static int unsolicited; -static int advert; -static int quiet; -static int quit_on_reply = 0; +struct cfg_s { + int dad:1; + int unsolicited:1; + int advert:1; + int quiet:1; + int quit_on_reply:1; + int unicasting:1; + int broadcast_only:1; +}; +static struct cfg_s cfg; + +static int s; static int count = -1; static int timeout; -static int unicasting; -static int s; -static int broadcast_only; 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 ) #if 0 @@ -69,7 +70,7 @@ static int send_pack(int sock, struct in_addr *src_addr, { int err; struct timeval now; - unsigned char buf[256]; + RESERVE_CONFIG_UBUFFER(buf, 256); struct arphdr *ah = (struct arphdr *) buf; unsigned char *p = (unsigned char *) (ah + 1); @@ -78,7 +79,7 @@ static int send_pack(int sock, struct in_addr *src_addr, ah->ar_pro = htons(ETH_P_IP); ah->ar_hln = ME->sll_halen; ah->ar_pln = 4; - ah->ar_op = advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST); + ah->ar_op = cfg.advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST); memcpy(p, &ME->sll_addr, ah->ar_hln); p += ME->sll_halen; @@ -86,7 +87,7 @@ static int send_pack(int sock, struct in_addr *src_addr, memcpy(p, src_addr, 4); p += 4; - if (advert) + if (cfg.advert) memcpy(p, &ME->sll_addr, ah->ar_hln); else memcpy(p, &HE->sll_addr, ah->ar_hln); @@ -100,15 +101,16 @@ static int send_pack(int sock, struct in_addr *src_addr, if (err == p - buf) { last = now; sent++; - if (!unicasting) + if (!cfg.unicasting) brd_sent++; } + RELEASE_CONFIG_BUFFER(buf); return err; } static void finish(void) { - if (!quiet) { + if (!cfg.quiet) { printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent); printf("Received %d repl%s", received, (received > 1) ? "ies" : "y"); if (brd_recv || req_recv) { @@ -122,9 +124,9 @@ static void finish(void) putchar('\n'); fflush(stdout); } - if (dad) + if (cfg.dad) exit(!!received); - if (unsolicited) + if (cfg.unsolicited) exit(0); exit(!received); } @@ -145,7 +147,7 @@ static void catcher(void) if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) { send_pack(s, &src, &dst, &me, &he); - if (count == 0 && unsolicited) + if (count == 0 && cfg.unsolicited) finish(); } alarm(1); @@ -153,13 +155,10 @@ static void catcher(void) static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) { - struct timeval tv; struct arphdr *ah = (struct arphdr *) buf; unsigned char *p = (unsigned char *) (ah + 1); struct in_addr src_ip, dst_ip; - gettimeofday(&tv, NULL); - /* Filter out wild packets */ if (FROM->sll_pkttype != PACKET_HOST && FROM->sll_pkttype != PACKET_BROADCAST && @@ -187,7 +186,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) return 0; memcpy(&src_ip, p + ah->ar_hln, 4); memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4); - if (!dad) { + if (!cfg.dad) { if (src_ip.s_addr != dst.s_addr) return 0; if (src.s_addr != dst_ip.s_addr) @@ -215,8 +214,11 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) if (src.s_addr && src.s_addr != dst_ip.s_addr) return 0; } - if (!quiet) { + if (!cfg.quiet) { int s_printed = 0; + struct timeval tv; + + gettimeofday(&tv, NULL); printf("%s ", FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast"); @@ -234,6 +236,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) printf("[%s]", 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; @@ -251,48 +254,46 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) brd_recv++; if (ah->ar_op == htons(ARPOP_REQUEST)) req_recv++; - if (quit_on_reply) + if (cfg.quit_on_reply) finish(); - if (!broadcast_only) { + if (!cfg.broadcast_only) { memcpy(he.sll_addr, p, me.sll_halen); - unicasting = 1; + cfg.unicasting = 1; } return 1; } int arping_main(int argc, char **argv) { - int socket_errno; int ch; - uid_t uid = getuid(); char *device = "eth0"; - int ifindex = 0; + int ifindex; char *source = NULL; char *target; s = socket(PF_PACKET, SOCK_DGRAM, 0); - socket_errno = errno; + ifindex = errno; - setuid(uid); + setuid(getuid()); while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) { switch (ch) { case 'b': - broadcast_only = 1; + cfg.broadcast_only = 1; break; case 'D': - dad++; - quit_on_reply = 1; + cfg.dad = 1; + cfg.quit_on_reply = 1; break; case 'U': - unsolicited++; + cfg.unsolicited = 1; break; case 'A': - advert++; - unsolicited++; + cfg.advert = 1; + cfg.unsolicited = 1; break; case 'q': - quiet++; + cfg.quiet = 1; break; case 'c': count = atoi(optarg); @@ -304,14 +305,13 @@ int arping_main(int argc, char **argv) if (optarg == NULL) bb_show_usage(); if (bb_strlen(optarg) > IF_NAMESIZE) { - bb_error_msg("Interface name `%s' must be less than %d", optarg, - IF_NAMESIZE); - exit(2); + bb_error_msg_and_die("Interface name `%s' must be less than %d", + optarg, IF_NAMESIZE); } device = optarg; break; case 'f': - quit_on_reply = 1; + cfg.quit_on_reply = 1; break; case 's': source = optarg; @@ -329,11 +329,11 @@ int arping_main(int argc, char **argv) bb_show_usage(); target = *argv; - + bb_default_error_retval = 2; if (s < 0) { - bb_error_msg("socket"); - exit(socket_errno); + bb_perror_msg("socket"); + exit(ifindex); } { @@ -342,22 +342,19 @@ int arping_main(int argc, char **argv) memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, device, IFNAMSIZ - 1); if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { - bb_error_msg("Interface %s not found", device); - exit(2); + bb_error_msg_and_die("Interface %s not found", device); } ifindex = ifr.ifr_ifindex; if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) { - bb_error_msg("SIOCGIFFLAGS"); - exit(2); + bb_error_msg_and_die("SIOCGIFFLAGS"); } if (!(ifr.ifr_flags & IFF_UP)) { - bb_error_msg("Interface %s is down", device); - exit(2); + bb_error_msg_and_die("Interface %s is down", device); } if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) { bb_error_msg("Interface %s is not ARPable", device); - exit(dad ? 0 : 2); + exit(cfg.dad ? 0 : 2); } } @@ -366,27 +363,24 @@ int arping_main(int argc, char **argv) hp = gethostbyname2(target, AF_INET); if (!hp) { - bb_error_msg("invalid or unknown target %s", target); - exit(2); + bb_error_msg_and_die("invalid or unknown target %s", target); } memcpy(&dst, hp->h_addr, 4); } if (source && !inet_aton(source, &src)) { - bb_error_msg("invalid source address %s", source); - exit(2); + bb_error_msg_and_die("invalid source address %s", source); } - if (!dad && unsolicited && src.s_addr == 0) + if (!cfg.dad && cfg.unsolicited && src.s_addr == 0) src = dst; - if (!dad || src.s_addr) { + if (!cfg.dad || src.s_addr) { struct sockaddr_in saddr; int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); if (probe_fd < 0) { - bb_error_msg("socket"); - exit(2); + bb_error_msg_and_die("socket"); } if (device) { if (setsockopt @@ -399,10 +393,9 @@ int arping_main(int argc, char **argv) if (src.s_addr) { saddr.sin_addr = src; if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) { - bb_error_msg("bind"); - exit(2); + bb_error_msg_and_die("bind"); } - } else if (!dad) { + } else if (!cfg.dad) { int on = 1; socklen_t alen = sizeof(saddr); @@ -412,16 +405,14 @@ int arping_main(int argc, char **argv) if (setsockopt (probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on, sizeof(on)) == -1) - perror("WARNING: setsockopt(SO_DONTROUTE)"); + bb_perror_msg("WARNING: setsockopt(SO_DONTROUTE)"); if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) { - bb_error_msg("connect"); - exit(2); + bb_error_msg_and_die("connect"); } if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) { - bb_error_msg("getsockname"); - exit(2); + bb_error_msg_and_die("getsockname"); } src = saddr.sin_addr; } @@ -432,34 +423,31 @@ int arping_main(int argc, char **argv) me.sll_ifindex = ifindex; me.sll_protocol = htons(ETH_P_ARP); if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) { - bb_error_msg("bind"); - exit(2); + bb_error_msg_and_die("bind"); } { socklen_t alen = sizeof(me); if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) { - bb_error_msg("getsockname"); - exit(2); + bb_error_msg_and_die("getsockname"); } } if (me.sll_halen == 0) { bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device); - exit(dad ? 0 : 2); + exit(cfg.dad ? 0 : 2); } he = me; memset(he.sll_addr, -1, he.sll_halen); - if (!quiet) { + if (!cfg.quiet) { printf("ARPING to %s", inet_ntoa(dst)); printf(" from %s via %s\n", inet_ntoa(src), device ? device : "unknown"); } - if (!src.s_addr && !dad) { - bb_error_msg("no src address in the non-DAD mode"); - exit(2); + if (!src.s_addr && !cfg.dad) { + bb_error_msg_and_die("no src address in the non-DAD mode"); } { |