diff options
Diffstat (limited to 'networking/udhcp/dumpleases.c')
| -rw-r--r-- | networking/udhcp/dumpleases.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/networking/udhcp/dumpleases.c b/networking/udhcp/dumpleases.c index 2d16ec160..c0d515d28 100644 --- a/networking/udhcp/dumpleases.c +++ b/networking/udhcp/dumpleases.c @@ -6,14 +6,24 @@ #include "common.h" #include "dhcpd.h" +#if BB_LITTLE_ENDIAN +static inline uint64_t hton64(uint64_t v) +{ + return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32); +} +#else +#define hton64(v) (v) +#endif +#define ntoh64(v) hton64(v) + + int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int dumpleases_main(int argc UNUSED_PARAM, char **argv) { int fd; int i; unsigned opt; - leasetime_t expires; - leasetime_t curr; + int64_t written_at, curr, expires_abs; const char *file = LEASES_FILE; struct dhcpOfferedAddr lease; struct in_addr addr; @@ -40,7 +50,13 @@ int dumpleases_main(int argc UNUSED_PARAM, char **argv) printf("Mac Address IP-Address Expires %s\n", (opt & OPT_a) ? "at" : "in"); /* "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */ + if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at)) + return 0; + written_at = ntoh64(written_at); curr = time(NULL); + if (curr < written_at) + written_at = curr; /* lease file from future! :) */ + while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) { const char *fmt = ":%02x" + 1; for (i = 0; i < 6; i++) { @@ -49,13 +65,14 @@ int dumpleases_main(int argc UNUSED_PARAM, char **argv) } addr.s_addr = lease.yiaddr; printf(" %-15s ", inet_ntoa(addr)); - if (lease.expires == 0) { + expires_abs = ntohl(lease.expires) + written_at; + if (expires_abs <= curr) { puts("expired"); continue; } - expires = ntohl(lease.expires); if (!(opt & OPT_a)) { /* no -a */ unsigned d, h, m; + unsigned expires = expires_abs - curr; d = expires / (24*60*60); expires %= (24*60*60); h = expires / (60*60); expires %= (60*60); m = expires / 60; expires %= 60; @@ -63,7 +80,7 @@ int dumpleases_main(int argc UNUSED_PARAM, char **argv) printf("%u days ", d); printf("%02u:%02u:%02u\n", h, m, (unsigned)expires); } else { /* -a */ - time_t t = expires + curr; + time_t t = expires_abs; fputs(ctime(&t), stdout); } } |