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List: busybox
Subject: [PATCH v2 1/6] udhcpc6: Add DHCPv6 env helper
From: Samuel Mendoza-Jonas <sam () mendozajonas ! com>
Date: 2018-05-14 4:29:11
Message-ID: 20180514042916.3229-2-sam () mendozajonas ! com
[Download RAW message or body]
Add string_option_to_env() to easily generate environment variables for
known simple options.
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
---
v2: Simplify ptr check
networking/udhcp/d6_dhcpc.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index 85d9da724..eea50c9ee 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -195,6 +195,37 @@ 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;
+ uint8_t val_len;
+ int i;
+
+ ptr = d6_option_strings;
+ i = 0;
+ while (ptr && *ptr) {
+ if (d6_optflags[i].code == option[1]) {
+ name = ptr;
+ break;
+ }
+ ptr += strlen(ptr) + 1;
+ i++;
+ }
+
+ if (!name) {
+ bb_error_msg("could not find option name for 0x%x, skipping\n",
+ option[1]);
+ return NULL;
+ }
+
+ val_len = option[2] << 8 | option[3];
+ if (val_len + &option[D6_OPT_DATA] > option_end) {
+ bb_error_msg("option data exceeds option length\n");
+ 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)
{
--
2.17.0
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