move a couple of functions from common code (options.c) to udhcpd private

code (files.c) to make udhcpc a little smaller.

1 files changed, 47 insertions, 1 deletions

diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 73a3bbc..33cd25a 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -15,8 +15,8 @@
 #include "static_leases.h"
 
 #include "dhcpd.h"
-#include "files.h"
 #include "options.h"
+#include "files.h"
 #include "common.h"
 
 /*
@@ -93,6 +93,52 @@ static int read_yn(const char *line, void *arg)
 }
 
 
+/* find option 'code' in opt_list */
+struct option_set *find_option(struct option_set *opt_list, char code)
+{
+	while (opt_list && opt_list->data[OPT_CODE] < code)
+		opt_list = opt_list->next;
+
+	if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list;
+	else return NULL;
+}
+
+
+/* add an option to the opt_list */
+void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length)
+{
+	struct option_set *existing, *new, **curr;
+
+	/* add it to an existing option */
+	if ((existing = find_option(*opt_list, option->code))) {
+		DEBUG(LOG_INFO, "Attaching option %s to existing member of list", option->name);
+		if (option->flags & OPTION_LIST) {
+			if (existing->data[OPT_LEN] + length <= 255) {
+				existing->data = realloc(existing->data,
+						existing->data[OPT_LEN] + length + 2);
+				memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
+				existing->data[OPT_LEN] += length;
+			} /* else, ignore the data, we could put this in a second option in the future */
+		} /* else, ignore the new data */
+	} else {
+		DEBUG(LOG_INFO, "Attaching option %s to list", option->name);
+
+		/* make a new option */
+		new = xmalloc(sizeof(struct option_set));
+		new->data = xmalloc(length + 2);
+		new->data[OPT_CODE] = option->code;
+		new->data[OPT_LEN] = length;
+		memcpy(new->data + 2, buffer, length);
+
+		curr = opt_list;
+		while (*curr && (*curr)->data[OPT_CODE] < option->code)
+			curr = &(*curr)->next;
+
+		new->next = *curr;
+		*curr = new;
+	}
+}
+
 /* read a dhcp option and add it to opt_list */
 static int read_opt(const char *const_line, void *arg)
 {