diff options
| -rw-r--r-- | networking/arping.c | 86 |
1 files changed, 54 insertions, 32 deletions
diff --git a/networking/arping.c b/networking/arping.c index 44615d5..771c3bc 100644 --- a/networking/arping.c +++ b/networking/arping.c @@ -18,12 +18,6 @@ /* We don't expect to see 1000+ seconds delay, unsigned is enough */ #define MONOTONIC_US() ((unsigned)monotonic_us()) -static struct in_addr src; -static struct in_addr dst; -static struct sockaddr_ll me; -static struct sockaddr_ll he; -static unsigned last; - enum { DAD = 1, UNSOLICITED = 2, @@ -34,14 +28,43 @@ enum { UNICASTING = 64 }; -static int sock; -static unsigned count = UINT_MAX; -static unsigned timeout_us; -static unsigned sent; -static unsigned brd_sent; -static unsigned received; -static unsigned brd_recv; -static unsigned req_recv; +struct globals { + struct in_addr src; + struct in_addr dst; + struct sockaddr_ll me; + struct sockaddr_ll he; + int sock; + + 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 (G.sock ) +#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) static int send_pack(struct in_addr *src_addr, struct in_addr *dst_addr, struct sockaddr_ll *ME, @@ -106,8 +129,6 @@ static void finish(void) static void catcher(void) { - static unsigned start; - unsigned now; now = MONOTONIC_US(); @@ -117,7 +138,9 @@ static void catcher(void) if (count == 0 || (timeout_us && (now - start) > (timeout_us + 500000))) finish(); - count--; + /* count < 0 means "infinite count" */ + if (count > 0) + count--; if (last == 0 || (now - last) > 500000) { send_pack(&src, &dst, &me, &he); @@ -236,6 +259,8 @@ int arping_main(int argc, char **argv) char *target; unsigned char *packet; + INIT_G(); + sock = xsocket(PF_PACKET, SOCK_DGRAM, 0); // Drop suid root privileges @@ -252,14 +277,9 @@ int arping_main(int argc, char **argv) opt = getopt32(argv, "DUAqfbc:w:I:s:", &str_count, &str_timeout, &device, &source); if (opt & 0x40) /* -c: count */ - count = xatou(str_count); + count = xatoi_u(str_count); if (opt & 0x80) /* -w: timeout */ timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000; - //if (opt & 0x100) /* -I: interface */ - if (strlen(device) >= IF_NAMESIZE) { - bb_error_msg_and_die("interface name '%s' is too long", - device); - } //if (opt & 0x200) /* -s: source */ option_mask32 &= 0x3f; /* set respective flags */ } @@ -272,8 +292,10 @@ int arping_main(int argc, char **argv) struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); - strncpy(ifr.ifr_name, device, IFNAMSIZ - 1); - ioctl_or_perror_and_die(sock, SIOCGIFINDEX, &ifr, "interface %s not found", device); + 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; xioctl(sock, SIOCGIFFLAGS, (char *) &ifr); @@ -308,7 +330,7 @@ int arping_main(int argc, char **argv) if (device) { if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1) - bb_error_msg("warning: interface %s is ignored", device); + bb_perror_msg("cannot bind to device %s", device); } memset(&saddr, 0, sizeof(saddr)); saddr.sin_family = AF_INET; @@ -322,7 +344,7 @@ int arping_main(int argc, char **argv) saddr.sin_addr = dst; if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1) - bb_perror_msg("warning: setsockopt(SO_DONTROUTE)"); + 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"); @@ -345,22 +367,22 @@ 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("interface %s is not ARPable (no ll address)", device); return (option_mask32 & DAD ? 0 : 2); } 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"); } - if (!src.s_addr && !(option_mask32 & DAD)) { - bb_error_msg_and_die("no src address in the non-DAD mode"); - } - { struct sigaction sa; |