diff options
| author | Denys Vlasenko | 2010-03-27 23:23:41 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2010-03-27 23:23:41 +0100 |
| commit | 9107b63a7fb80fcab0da71cf12e8c81dfc394d20 (patch) | |
| tree | 566be6323a69a09949110349e720e33d7dd66fb2 /networking/udhcp/common.c | |
| parent | c2fdd41f5f97349f23b2a66592b9b29834faabaf (diff) | |
| download | busybox-9107b63a7fb80fcab0da71cf12e8c81dfc394d20.zip busybox-9107b63a7fb80fcab0da71cf12e8c81dfc394d20.tar.gz | |
udhcp: abort if we see unknown option, and show valid options if so
function old new delta
udhcp_option_idx - 77 +77
udhcp_str2optset 366 351 -15
udhcpc_main 2845 2801 -44
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 77/-59) Total: 18 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/udhcp/common.c')
| -rw-r--r-- | networking/udhcp/common.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c index 9316774..6e8ec3e 100644 --- a/networking/udhcp/common.c +++ b/networking/udhcp/common.c @@ -146,6 +146,25 @@ static void log_option(const char *pfx, const uint8_t *opt) # define log_option(pfx, opt) ((void)0) #endif +unsigned FAST_FUNC udhcp_option_idx(const char *name) +{ + int n = index_in_strings(dhcp_option_strings, name); + if (n >= 0) + return n; + + { + char buf[sizeof(dhcp_option_strings)]; + char *d = buf; + const char *s = dhcp_option_strings; + while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) { + *d++ = (*s == '\0' ? ' ' : *s); + s++; + } + *d = '\0'; + bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf); + } +} + /* get an option with bounds checking (warning, result is not aligned). */ uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code) { @@ -372,7 +391,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) char *opt, *val, *endptr; char *str; const struct dhcp_option *option; - int retval, length, idx; + int retval, length; char buffer[8] ALIGNED(4); uint16_t *result_u16 = (uint16_t *) buffer; uint32_t *result_u32 = (uint32_t *) buffer; @@ -383,10 +402,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg) if (!opt) return 0; - idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */ - if (idx < 0) - return 0; - option = &dhcp_options[idx]; + option = &dhcp_options[udhcp_option_idx(opt)]; retval = 0; do { |