diff options
Diffstat (limited to 'networking/udhcp/files.c')
-rw-r--r-- | networking/udhcp/files.c | 43 |
1 files changed, 30 insertions, 13 deletions
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c index 76b42f0..64edcbb 100644 --- a/networking/udhcp/files.c +++ b/networking/udhcp/files.c @@ -12,6 +12,16 @@ #include "dhcpd.h" #include "options.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) + /* on these functions, make sure your datatype matches */ static int read_ip(const char *line, void *arg) @@ -335,14 +345,16 @@ void FAST_FUNC write_leases(void) int fd; unsigned i; leasetime_t curr; + int64_t written_at; fd = open_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC); if (fd < 0) return; - curr = time(NULL); -//TODO: write out current time? Readers need to adjust .expires field -// to account for time between file was written and when it was read back. + curr = written_at = time(NULL); + + written_at = hton64(written_at); + full_write(fd, &written_at, sizeof(written_at)); for (i = 0; i < server_config.max_leases; i++) { leasetime_t tmp_time; @@ -353,11 +365,9 @@ void FAST_FUNC write_leases(void) /* screw with the time in the struct, for easier writing */ tmp_time = leases[i].expires; - //if (server_config.remaining) { - leases[i].expires -= curr; - if ((signed_leasetime_t) leases[i].expires < 0) - leases[i].expires = 0; - //} /* else stick with the time we got */ + leases[i].expires -= curr; + if ((signed_leasetime_t) leases[i].expires < 0) + leases[i].expires = 0; leases[i].expires = htonl(leases[i].expires); /* No error check. If the file gets truncated, @@ -382,14 +392,20 @@ void FAST_FUNC read_leases(const char *file) { int fd; unsigned i; -// leasetime_t curr; struct dhcpOfferedAddr lease; + int64_t written_at, curr; fd = open_or_warn(file, O_RDONLY); if (fd < 0) return; -// curr = time(NULL); + if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at)) + goto ret; + written_at = ntoh64(written_at); + curr = time(NULL); + if (curr < written_at) + written_at = curr; /* lease file from future! :) */ + i = 0; while (i < server_config.max_leases && full_read(fd, &lease, sizeof(lease)) == sizeof(lease) @@ -397,9 +413,9 @@ void FAST_FUNC read_leases(const char *file) /* ADDME: what if it matches some static lease? */ uint32_t y = ntohl(lease.yiaddr); if (y >= server_config.start_ip && y <= server_config.end_ip) { - leasetime_t expires = ntohl(lease.expires); -// if (!server_config.remaining) -// expires -= curr; + int64_t expires = ntohl(lease.expires) + written_at - curr; + if (expires <= 0) + continue; /* NB: add_lease takes "relative time", IOW, * lease duration, not lease deadline. */ if (!(add_lease(lease.chaddr, lease.yiaddr, expires))) { @@ -410,5 +426,6 @@ void FAST_FUNC read_leases(const char *file) } } DEBUG("Read %d leases", i); + ret: close(fd); } |