diff options
| -rw-r--r-- | networking/arping.c | 57 |
1 files changed, 27 insertions, 30 deletions
diff --git a/networking/arping.c b/networking/arping.c index f71a984..c89b975 100644 --- a/networking/arping.c +++ b/networking/arping.c @@ -121,7 +121,7 @@ static void finish(void) if (option_mask32 & DAD) exit(!!received); if (option_mask32 & UNSOLICITED) - exit(0); + exit(EXIT_SUCCESS); exit(!received); } @@ -148,7 +148,7 @@ static void catcher(void) 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); @@ -158,35 +158,33 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) if (FROM->sll_pkttype != PACKET_HOST && FROM->sll_pkttype != PACKET_BROADCAST && FROM->sll_pkttype != PACKET_MULTICAST) - return 0; + return false; /* Only these types are recognised */ 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; + 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; + if (ah->ar_pro != htons(ETH_P_IP) + || (ah->ar_pln != 4) + || (ah->ar_hln != me.sll_halen) + || (len < sizeof(*ah) + 2 * (4 + ah->ar_hln))) + return false; + memcpy(&src_ip, p + ah->ar_hln, 4); memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4); + + if (dst.s_addr != src_ip.s_addr) + return false; if (!(option_mask32 & DAD)) { - if (dst.s_addr != src_ip.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 ((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) @@ -201,12 +199,9 @@ 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 (!(option_mask32 & QUIET)) { int s_printed = 0; @@ -246,7 +241,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) memcpy(he.sll_addr, p, me.sll_halen); option_mask32 |= UNICASTING; } - return 1; + return true; } int arping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; @@ -256,6 +251,7 @@ int arping_main(int argc, char **argv) char *source = NULL; char *target; unsigned char *packet; + char *err_str; INIT_G(); @@ -265,6 +261,7 @@ int arping_main(int argc, char **argv) // 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_count, *str_timeout; @@ -294,16 +291,16 @@ int arping_main(int argc, char **argv) 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_fd, SIOCGIFINDEX, &ifr, "interface %s not found", ifr.ifr_name); + 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("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); + bb_error_msg(err_str, "is not ARPable"); return (option_mask32 & DAD ? 0 : 2); } } @@ -368,7 +365,7 @@ int arping_main(int argc, char **argv) } } if (me.sll_halen == 0) { - bb_error_msg("interface %s is not ARPable (no ll address)", device); + bb_error_msg(err_str, "is not ARPable (no ll address)"); return (option_mask32 & DAD ? 0 : 2); } he = me; |