diff options
Diffstat (limited to 'src/customdhcpcd/duid.c')
| -rw-r--r-- | src/customdhcpcd/duid.c | 147 |
1 files changed, 77 insertions, 70 deletions
diff --git a/src/customdhcpcd/duid.c b/src/customdhcpcd/duid.c index e4dd83b..c51503d 100644 --- a/src/customdhcpcd/duid.c +++ b/src/customdhcpcd/duid.c @@ -1,4 +1,4 @@ -/* +/* * dhcpcd - DHCP client daemon * Copyright 2006-2008 Roy Marples <roy@marples.name> * All rights reserved @@ -45,74 +45,81 @@ size_t get_duid (unsigned char *duid, const interface_t *iface) { - FILE *f; - uint16_t type = 0; - uint16_t hw = 0; - uint32_t ul; - time_t t; - int x = 0; - unsigned char *p = duid; - size_t len = 0; - - if (! iface) - return (0); - - /* If we already have a DUID then use it as it's never supposed - * to change once we have one even if the interfaces do */ - if ((f = fopen (DUIDFILE, "r"))) { - char *line = get_line (f); - if (line) { - len = hwaddr_aton (NULL, line); - if (len && len <= DUID_LEN) - hwaddr_aton (duid, line); - free (line); - } - fclose (f); - if (len) - return (len); - } else { - if (errno != ENOENT) { - logger (LOG_ERR, "fopen `%s': %s", - DUIDFILE, strerror (errno)); - return (0); - } - } - - /* No file? OK, lets make one based on our interface */ - type = htons (1); /* DUI-D-LLT */ - memcpy (p, &type, 2); - p += 2; - - hw = htons (iface->family); - memcpy (p, &hw, 2); - p += 2; - - /* time returns seconds from jan 1 1970, but DUID-LLT is - * seconds from jan 1 2000 modulo 2^32 */ - t = time (NULL) - THIRTY_YEARS_IN_SECONDS; - ul = htonl (t & 0xffffffff); - memcpy (p, &ul, 4); - p += 4; - - /* Finally, add the MAC address of the interface */ - memcpy (p, iface->hwaddr, iface->hwlen); - p += iface->hwlen; - - len = p - duid; - - if (! (f = fopen (DUIDFILE, "w"))) - logger (LOG_ERR, "fopen `%s': %s", DUIDFILE, strerror (errno)); - else { - x = fprintf (f, "%s\n", hwaddr_ntoa (duid, len)); - fclose (f); - } - - /* Failed to write the duid? scrub it, we cannot use it */ - if (x < 1) { - len = 0; - unlink (DUIDFILE); - } - - return (len); + FILE *f; + uint16_t type = 0; + uint16_t hw = 0; + uint32_t ul; + time_t t; + int x = 0; + unsigned char *p = duid; + size_t len = 0; + + if (! iface) + return (0); + + /* If we already have a DUID then use it as it's never supposed + * to change once we have one even if the interfaces do */ + if ((f = fopen (DUIDFILE, "r"))) + { + char *line = get_line (f); + if (line) + { + len = hwaddr_aton (NULL, line); + if (len && len <= DUID_LEN) + hwaddr_aton (duid, line); + free (line); + } + fclose (f); + if (len) + return (len); + } + else + { + if (errno != ENOENT) + { + logger (LOG_ERR, "fopen `%s': %s", + DUIDFILE, strerror (errno)); + return (0); + } + } + + /* No file? OK, lets make one based on our interface */ + type = htons (1); /* DUI-D-LLT */ + memcpy (p, &type, 2); + p += 2; + + hw = htons (iface->family); + memcpy (p, &hw, 2); + p += 2; + + /* time returns seconds from jan 1 1970, but DUID-LLT is + * seconds from jan 1 2000 modulo 2^32 */ + t = time (NULL) - THIRTY_YEARS_IN_SECONDS; + ul = htonl (t & 0xffffffff); + memcpy (p, &ul, 4); + p += 4; + + /* Finally, add the MAC address of the interface */ + memcpy (p, iface->hwaddr, iface->hwlen); + p += iface->hwlen; + + len = p - duid; + + if (! (f = fopen (DUIDFILE, "w"))) + logger (LOG_ERR, "fopen `%s': %s", DUIDFILE, strerror (errno)); + else + { + x = fprintf (f, "%s\n", hwaddr_ntoa (duid, len)); + fclose (f); + } + + /* Failed to write the duid? scrub it, we cannot use it */ + if (x < 1) + { + len = 0; + unlink (DUIDFILE); + } + + return (len); } #endif |