r3409 - trunk/varnish-cache/lib/libvcl
phk at projects.linpro.no
phk at projects.linpro.no
Thu Nov 20 11:03:53 CET 2008
Author: phk
Date: 2008-11-20 11:03:53 +0100 (Thu, 20 Nov 2008)
New Revision: 3409
Modified:
trunk/varnish-cache/lib/libvcl/vcc_acl.c
Log:
Clean up the ACL generation code a bit.
Modified: trunk/varnish-cache/lib/libvcl/vcc_acl.c
===================================================================
--- trunk/varnish-cache/lib/libvcl/vcc_acl.c 2008-11-20 08:50:56 UTC (rev 3408)
+++ trunk/varnish-cache/lib/libvcl/vcc_acl.c 2008-11-20 10:03:53 UTC (rev 3409)
@@ -60,59 +60,87 @@
/* Compare two acl rules for ordering */
+#define CMP(a, b) \
+ do { \
+ if ((a) < (b)) \
+ return (-1); \
+ else if ((b) < (a)) \
+ return (1); \
+ } while (0)
+
static int
-vcl_acl_cmp(struct tokenlist *tl, struct acl_e *ae1, struct acl_e *ae2)
+vcl_acl_cmp(struct acl_e *ae1, struct acl_e *ae2)
{
unsigned char *p1, *p2;
unsigned m;
- (void)tl;
p1 = ae1->data;
p2 = ae2->data;
m = ae1->mask;
if (ae2->mask < m)
m = ae2->mask;
for (; m >= 8; m -= 8) {
- if (*p1 < *p2)
- return (-1);
- if (*p1 > *p2)
- return (1);
+ CMP(*p1, *p2);
p1++;
p2++;
}
if (m) {
m = 0xff00 >> m;
m &= 0xff;
- if ((*p1 & m) < (*p2 & m))
- return (-1);
- if ((*p1 & m) > (*p2 & m))
- return (1);
+ CMP(*p1 & m, *p2 & m);
}
- if (ae1->mask > ae2->mask)
- return (-1);
- if (ae1->mask < ae2->mask)
- return (1);
+ /* Long mask is less than short mask */
+ CMP(ae2->mask, ae1->mask);
return (0);
}
static void
-vcl_acl_add_entry(struct tokenlist *tl, struct acl_e *ae)
+vcc_acl_add_entry(struct tokenlist *tl, const struct acl_e *ae, int l,
+ const unsigned char *u, int fam)
{
- struct acl_e *ae2;
+ struct acl_e *ae2, *aen;
int i;
+ if (fam == PF_INET && ae->mask > 32) {
+ vsb_printf(tl->sb,
+ "Too wide mask (%u) for IPv4 address", ae->mask);
+ vcc_ErrWhere(tl, ae->t_mask);
+ return;
+ }
+ if (fam == PF_INET6 && ae->mask > 128) {
+ vsb_printf(tl->sb,
+ "Too wide mask (%u) for IPv6 address", ae->mask);
+ vcc_ErrWhere(tl, ae->t_mask);
+ return;
+ }
+
+ /* Make a copy from the template */
+ aen = TlAlloc(tl, sizeof *ae2);
+ AN(aen);
+ *aen = *ae;
+
+ /* We treat family as part of address, it saves code */
+ assert(fam <= 0xff);
+ aen->data[0] = fam & 0xff;
+ aen->mask += 8;
+
+ memcpy(aen->data + 1, u, l);
+
VTAILQ_FOREACH(ae2, &tl->acl, list) {
- i = vcl_acl_cmp(tl, ae, ae2);
+ i = vcl_acl_cmp(aen, ae2);
if (i == 0) {
- /* If the two rules agree, silently ignore it */
- if (ae->not == ae2->not)
+ /*
+ * If the two rules agree, silently ignore it
+ * XXX: is that counter intuitive ?
+ */
+ if (aen->not == ae2->not)
return;
vsb_printf(tl->sb, "Conflicting ACL entries:\n");
vcc_ErrWhere(tl, ae2->t_addr);
vsb_printf(tl->sb, "vs:\n");
- vcc_ErrWhere(tl, ae->t_addr);
+ vcc_ErrWhere(tl, aen->t_addr);
return;
}
/*
@@ -126,46 +154,14 @@
* be used to gather statistics.
*/
if (i < 0) {
- VTAILQ_INSERT_BEFORE(ae2, ae, list);
+ VTAILQ_INSERT_BEFORE(ae2, aen, list);
return;
}
}
- VTAILQ_INSERT_TAIL(&tl->acl, ae, list);
+ VTAILQ_INSERT_TAIL(&tl->acl, aen, list);
}
static void
-vcc_acl_emit_entry(struct tokenlist *tl, const struct acl_e *ae, int l,
- const unsigned char *u, int fam)
-{
- struct acl_e *ae2;
-
- if (fam == PF_INET && ae->mask > 32) {
- vsb_printf(tl->sb,
- "Too wide mask (%u) for IPv4 address", ae->mask);
- vcc_ErrWhere(tl, ae->t_mask);
- return;
- }
- if (fam == PF_INET6 && ae->mask > 128) {
- vsb_printf(tl->sb,
- "Too wide mask (%u) for IPv6 address", ae->mask);
- vcc_ErrWhere(tl, ae->t_mask);
- return;
- }
-
- ae2 = TlAlloc(tl, sizeof *ae2);
- AN(ae2);
- *ae2 = *ae;
-
- ae2->data[0] = fam & 0xff;
- ae2->mask += 8; /* family matching */
-
- memcpy(ae2->data + 1, u, l);
-
- vcl_acl_add_entry(tl, ae2);
-
-}
-
-static void
vcc_acl_try_getaddrinfo(struct tokenlist *tl, struct acl_e *ae)
{
struct addrinfo *res0, *res, hint;
@@ -211,7 +207,7 @@
if (ae->t_mask == NULL)
ae->mask = 32;
i4++;
- vcc_acl_emit_entry(tl, ae, 4, u, res->ai_family);
+ vcc_acl_add_entry(tl, ae, 4, u, res->ai_family);
break;
case PF_INET6:
assert(PF_INET6 < 256);
@@ -221,7 +217,7 @@
if (ae->t_mask == NULL)
ae->mask = 128;
i6++;
- vcc_acl_emit_entry(tl, ae, 16, u, res->ai_family);
+ vcc_acl_add_entry(tl, ae, 16, u, res->ai_family);
break;
default:
vsb_printf(tl->sb,
@@ -270,7 +266,7 @@
}
if (ae->t_mask == NULL)
ae->mask = 8 + 8 * i;
- vcc_acl_emit_entry(tl, ae, 4, b, AF_INET);
+ vcc_acl_add_entry(tl, ae, 4, b, AF_INET);
return (1);
}
@@ -321,9 +317,12 @@
ERRCHK(tl);
}
+/*********************************************************************
+ * Emit a function to match the ACL we have collected
+ */
+
static void
-vcc_acl_bot(const struct tokenlist *tl, const char *acln, int silent,
- const char *pfx)
+vcc_acl_emit(const struct tokenlist *tl, const char *acln, int anon)
{
struct acl_e *ae;
int depth, l, m, i;
@@ -333,7 +332,7 @@
Fh(tl, 0, "\nstatic int\n");
Fh(tl, 0, "match_acl_%s_%s(const struct sess *sp, const void *p)\n",
- pfx, acln);
+ anon ? "anon" : "named", acln);
Fh(tl, 0, "{\n");
Fh(tl, 0, "\tconst unsigned char *a;\n");
assert(sizeof (unsigned char) == 1);
@@ -375,30 +374,31 @@
/* Back down, if necessary */
oc = "";
while (l <= depth) {
- Fh(tl, 0, "\t%*s}\n",
- -depth, "");
+ Fh(tl, 0, "\t%*s}\n", -depth, "");
depth--;
oc = "else ";
}
+
m = ae->mask;
m -= l * 8;
+
+ /* Do whole byte compares */
for (i = l; m >= 8; m -= 8, i++) {
- if (i == 0) {
+ if (i == 0)
Fh(tl, 0, "\t%*s%sif (fam == %d) {\n",
-i, "", oc, ae->data[i]);
- } else {
+ else
Fh(tl, 0, "\t%*s%sif (a[%d] == %d) {\n",
-i, "", oc, i - 1, ae->data[i]);
- }
at[i] = ae->data[i];
depth = i;
oc = "";
}
+
if (m > 0) {
+ /* Do fractional byte compares */
Fh(tl, 0, "\t%*s%sif ((a[%d] & 0x%x) == %d) {\n",
- -i, "",
- oc,
- i - 1, (0xff00 >> m) & 0xff,
+ -i, "", oc, i - 1, (0xff00 >> m) & 0xff,
ae->data[i] & ((0xff00 >> m) & 0xff));
at[i] = 256;
depth = i;
@@ -407,11 +407,9 @@
i = (ae->mask + 7) / 8;
- if (!silent) {
+ if (!anon) {
Fh(tl, 0, "\t%*sVRT_acl_log(sp, \"%sMATCH %s \" ",
- -i, "",
- ae->not ? "NEG_" : "",
- acln,
+ -i, "", ae->not ? "NEG_" : "", acln,
PF(ae->t_addr));
EncToken(tl->fh, ae->t_addr);
if (ae->t_mask != NULL)
@@ -422,9 +420,12 @@
Fh(tl, 0, "\t%*sreturn (%d);\n", -i, "", ae->not ? 0 : 1);
}
+ /* Unwind */
for (; 0 <= depth; depth--)
Fh(tl, 0, "\t%*.*s}\n", depth, depth, "");
- if (!silent)
+
+ /* Deny by default */
+ if (!anon)
Fh(tl, 0, "\tVRT_acl_log(sp, \"NO_MATCH %s\");\n", acln);
Fh(tl, 0, "\treturn (0);\n}\n");
}
@@ -453,7 +454,7 @@
asprintf(&acln, "%u", tl->cnt);
assert(acln != NULL);
vcc_acl_entry(tl);
- vcc_acl_bot(tl, acln, 1, "anon");
+ vcc_acl_emit(tl, acln, 1);
Fb(tl, 1, "%smatch_acl_anon_%s(sp, %s)\n",
(tcond == T_NEQ ? "!" : ""), acln, vp->rname);
free(acln);
@@ -497,7 +498,7 @@
ExpectErr(tl, '}');
vcc_NextToken(tl);
- vcc_acl_bot(tl, acln, 0, "named");
+ vcc_acl_emit(tl, acln, 0);
free(acln);
}
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