new

src/libndb/csipinfo.c

@@ -0,0 +1,68 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ndb.h>
+#include <ndbhf.h>
+
+/*
+ *  look up the ip attributes 'list' for an entry that has the
+ *  given 'attr=val' and a 'ip=' tuples.
+ *
+ *  return nil if not found.
+ */
+Ndbtuple*
+csipinfo(char *netroot, char *attr, char *val, char **list, int n)
+{
+	Ndbtuple *t, *first, *last;
+	int i;
+	char line[1024];
+	int fd;
+	char *p, *e;
+
+	if(netroot)
+		snprint(line, sizeof(line), "%s/cs", netroot);
+	else
+		strcpy(line, "/net/cs");
+	fd = open(line, ORDWR);
+	if(fd < 0)
+		return 0;
+	seek(fd, 0, 0);
+	e = line + sizeof(line);
+	p = seprint(line, e, "!ipinfo %s=%s", attr, val);
+	for(i = 0; i < n; i++){
+		if(*list == nil)
+			break;
+		p = seprint(p, e, " %s", *list++);
+	}
+	
+	if(write(fd, line, strlen(line)) < 0){
+		close(fd);
+		return 0;
+	}
+	seek(fd, 0, 0);
+
+	first = last = 0;
+	for(;;){
+		n = read(fd, line, sizeof(line)-2);
+		if(n <= 0)
+			break;
+		line[n] = '\n';
+		line[n+1] = 0;
+
+		t = _ndbparseline(line);
+		if(t == 0)
+			continue;
+		if(first)
+			last->entry = t;
+		else
+			first = t;
+		last = t;
+
+		while(last->entry)
+			last = last->entry;
+	}
+	close(fd);
+
+	setmalloctag(first, getcallerpc(&netroot));
+	return first;
+}