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roy 2012-12-06 11:16:47 +00:00
parent b84abd3f0f
commit a6e5712818
1 changed files with 28 additions and 12 deletions
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40
external/bsd/dhcpcd/dist/dhcp.c vendored
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@ -253,7 +253,7 @@ int make_option_mask(uint8_t *mask, const char *opts, int add)
}
static int
valid_length(uint8_t option, int dl, int *type)
validate_length(uint8_t option, int dl, int *type)
{
const struct dhcp_opt *opt;
ssize_t sz;
@ -270,10 +270,13 @@ valid_length(uint8_t option, int dl, int *type)
if (opt->type == 0 ||
opt->type & (STRING | RFC3442 | RFC5969))
return 0;
return dl;
if (opt->type & IPV4 && opt->type & ARRAY)
return (dl % sizeof(uint32_t) == 0 ? 0 : -1);
if (opt->type & IPV4 && opt->type & ARRAY) {
if (dl < (int)sizeof(uint32_t))
return -1;
return dl - (dl % sizeof(uint32_t));
}
sz = 0;
if (opt->type & (UINT32 | IPV4))
@ -283,17 +286,20 @@ valid_length(uint8_t option, int dl, int *type)
if (opt->type & UINT8)
sz = sizeof(uint8_t);
/* If we don't know the size, assume it's valid */
return (sz == 0 || dl == sz ? 0 : -1);
if (sz == 0)
return dl;
return (dl < sz ? -1 : sz);
}
/* unknown option, so let it pass */
return 0;
return dl;
}
#ifdef DEBUG_MEMORY
static void
free_option_buffer(void)
{
free(opt_buffer);
}
#endif
@ -309,7 +315,7 @@ get_option(const struct dhcp_message *dhcp, uint8_t opt, int *len, int *type)
uint8_t overl = 0;
uint8_t *bp = NULL;
const uint8_t *op = NULL;
int bl = 0;
ssize_t bl = 0;
while (p < e) {
o = *p++;
@ -358,7 +364,9 @@ get_option(const struct dhcp_message *dhcp, uint8_t opt, int *len, int *type)
}
exit:
if (valid_length(opt, bl, type) == -1) {
bl = validate_length(opt, bl, type);
if (bl == -1) {
errno = EINVAL;
return NULL;
}
@ -431,10 +439,14 @@ get_option_uint8(uint8_t *i, const struct dhcp_message *dhcp, uint8_t option)
ssize_t
decode_rfc3397(char *out, ssize_t len, int pl, const uint8_t *p)
{
const char *start;
ssize_t start_len;
const uint8_t *r, *q = p;
int count = 0, l, hops;
uint8_t ltype;
start = out;
start_len = len;
while (q - p < pl) {
r = NULL;
hops = 0;
@ -474,15 +486,19 @@ decode_rfc3397(char *out, ssize_t len, int pl, const uint8_t *p)
}
}
/* change last dot to space */
if (out)
if (out && out != start)
*(out - 1) = ' ';
if (r)
q = r;
}
/* change last space to zero terminator */
if (out)
*(out - 1) = 0;
if (out) {
if (out != start)
*(out - 1) = '\0';
else if (start_len > 0)
*out = '\0';
}
return count;
}
@ -1177,7 +1193,7 @@ read_lease(const struct interface *iface)
return dhcp;
}
static ssize_t
ssize_t
print_string(char *s, ssize_t len, int dl, const uint8_t *data)
{
uint8_t c;