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udhcpc6: add DHCPv6 env helper

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Add string_option_to_env() to easily generate environment variables for
known simple options.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Samuel Mendoza-Jonas 2018-05-14 14:29:11 +10:00 committed by Denys Vlasenko
parent 43b9235f66
commit bcdec1a8b8
1 changed files with 28 additions and 0 deletions
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28
networking/udhcp/d6_dhcpc.c
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@ -195,6 +195,34 @@ static char** new_env(void)
return &client6_data.env_ptr[client6_data.env_idx++];
}
static char *string_option_to_env(uint8_t *option, uint8_t *option_end)
{
const char *ptr, *name = NULL;
unsigned val_len;
int i;
ptr = d6_option_strings;
i = 0;
while (*ptr) {
if (d6_optflags[i].code == option[1]) {
name = ptr;
goto found;
}
ptr += strlen(ptr) + 1;
i++;
}
bb_error_msg("can't find option name for 0x%x, skipping", option[1]);
return NULL;
found:
val_len = (option[2] << 8) | option[3];
if (val_len + &option[D6_OPT_DATA] > option_end) {
bb_error_msg("option data exceeds option length");
return NULL;
}
return xasprintf("%s=%.*s", name, val_len, (char*)option + 4);
}
/* put all the parameters into the environment */
static void option_to_env(uint8_t *option, uint8_t *option_end)
{