r1287 - trunk/varnish-cache/bin/varnishd
des at projects.linpro.no
des at projects.linpro.no
Thu Mar 29 12:49:58 CEST 2007
Author: des
Date: 2007-03-29 12:49:58 +0200 (Thu, 29 Mar 2007)
New Revision: 1287
Modified:
trunk/varnish-cache/bin/varnishd/mgt_cli.c
Log:
The argv length calculation was not only off by one, but failed to take
into account the extra space required by expanded quotes, backslashes and
newlines. Instead of pre-allocating a (possibly too short) buffer, start
with a 64-byte buffer and double it every time we come close to filling
it up. Also, avoid appending a trailing space before the final newline.
This issue was uncovered by Kristoffer Gleditsch <kristoffer at linpro.no>,
who also helped test this patch.
Modified: trunk/varnish-cache/bin/varnishd/mgt_cli.c
===================================================================
--- trunk/varnish-cache/bin/varnishd/mgt_cli.c 2007-03-28 09:26:18 UTC (rev 1286)
+++ trunk/varnish-cache/bin/varnishd/mgt_cli.c 2007-03-29 10:49:58 UTC (rev 1287)
@@ -95,14 +95,23 @@
cli_out(cli, "Cache process not running");
return;
}
- v = 0;
- for (u = 1; av[u] != NULL; u++)
- v += strlen(av[u]) + 3;
+ v = 64;
p = malloc(v);
XXXAN(p);
q = p;
for (u = 1; av[u] != NULL; u++) {
+ if (v < (q - p) + 8) {
+ r = realloc(p, v + v);
+ XXXAN(r);
+ v += v;
+ q += r - p;
+ p = r;
+ }
+ /* v >= (q - p) + 8 */
+ if (u > 1)
+ *q++ = ' ';
*q++ = '"';
+ /* v >= (q - p) + 6 */
for (r = av[u]; *r; r++) {
switch (*r) {
case '\\': *q++ = '\\'; *q++ = '\\'; break;
@@ -111,9 +120,10 @@
default: *q++ = *r; break;
}
}
+ /* v >= (q - p) + 4 */
*q++ = '"';
- *q++ = ' ';
}
+ /* v >= (q - p) + 3 */
*q++ = '\n';
v = q - p;
i = write(cli_o, p, v);
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