Import release 0.1.6

[secnet.git] / ipaddr.c

diff --git a/ipaddr.c b/ipaddr.c
new file mode 100644 (file)
index 0000000..2dc5928
--- /dev/null
+++ b/ipaddr.c
@@ -0,0 +1,81 @@
+#include "secnet.h"
+#include <stdio.h>
+
+/* This file should eventually incorporate all the functionality of
+   ipaddr.py */
+
+bool_t subnet_match(struct subnet *s, uint32_t address)
+{
+    return (s->prefix==(address&s->mask));
+}
+
+bool_t subnet_matches_list(struct subnet_list *list, uint32_t address)
+{
+    uint32_t i;
+    for (i=0; i<list->entries; i++) {
+       if (list->list[i].prefix == (address&list->list[i].mask)) return True;
+    }
+    return False;
+}
+
+bool_t subnets_intersect(struct subnet a, struct subnet b)
+{
+    uint32_t mask=a.mask&b.mask;
+    return ((a.prefix&mask)==(b.prefix&mask));
+}
+
+bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b)
+{
+    uint32_t i;
+
+    for (i=0; i<b->entries; i++) {
+       if (subnets_intersect(a,b->list[i])) return True;
+    }
+    return False;
+}
+
+bool_t subnet_lists_intersect(struct subnet_list *a, struct subnet_list *b)
+{
+    uint32_t i;
+    for (i=0; i<a->entries; i++) {
+       if (subnet_intersects_with_list(a->list[i],b)) return True;
+    }
+    return False;
+}
+
+/* The string buffer must be at least 16 bytes long */
+string_t ipaddr_to_string(uint32_t addr)
+{
+    uint8_t a,b,c,d;
+    string_t s;
+
+    s=safe_malloc(16,"ipaddr_to_string");
+    a=addr>>24;
+    b=addr>>16;
+    c=addr>>8;
+    d=addr;
+    snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d);
+    return s;
+}
+
+string_t subnet_to_string(struct subnet *sn)
+{
+    uint32_t mask=sn->mask, addr=sn->prefix;
+    uint8_t a,b,c,d;
+    string_t s;
+    int i;
+
+    s=safe_malloc(19,"subnet_to_string");
+    a=addr>>24;
+    b=addr>>16;
+    c=addr>>8;
+    d=addr;
+    for (i=0; mask; i++) {
+       mask=(mask<<1);
+    }
+    if (i!=sn->len) {
+       fatal("subnet_to_string: invalid subnet structure!\n");
+    }
+    snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, sn->len);
+    return s;
+}