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authorMark Lodato <lodatom@gmail.com>2010-02-09 15:12:43 (UTC)
committer Mark Lodato <lodatom@gmail.com>2010-02-09 15:12:43 (UTC)
commita2c6355f9fdede78ce46aeee39ef649637aaadf9 (patch) (side-by-side diff)
tree4ed595f688691e7a35c5684ca59164bcc777b74c
parent8aab27f24de70acfbdcee31c634a4b1facf23b92 (diff)
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html: properly percent-escape URLs
The only valid characters for a URL are unreserved characters a-zA-Z0-9_-.~ and the reserved characters !*'();:@&=+$,/?%#[] , as per RFC 3986. Everything else must be escaped. Additionally, the # and ? always have special meaning, and the &, =, and + have special meaning in a query string, so they too must be escaped. To make this easier, a table of escapes is now used so that we do not have to call fmt() for each character; if the entry is 0, no escaping is needed. Signed-off-by: Mark Lodato <lodatom@gmail.com>
Diffstat (more/less context) (show whitespace changes)
-rw-r--r--html.c36
1 files changed, 32 insertions, 4 deletions
diff --git a/html.c b/html.c
index 4033200..337baeb 100644
--- a/html.c
+++ b/html.c
@@ -4,24 +4,50 @@
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
+/* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
+static const char* url_escape_table[256] = {
+ "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09",
+ "%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%10", "%11", "%12", "%13",
+ "%14", "%15", "%16", "%17", "%18", "%19", "%1a", "%1b", "%1c", "%1d",
+ "%1e", "%1f", "%20", 0, "%22", "%23", 0, "%25", "%26", "%27", 0, 0, 0,
+ "%2b", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%3c", "%3d",
+ "%3e", "%3f", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, "%5c", 0, "%5e", 0, "%60", 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%7b",
+ "%7c", "%7d", 0, "%7f", "%80", "%81", "%82", "%83", "%84", "%85",
+ "%86", "%87", "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
+ "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97", "%98", "%99",
+ "%9a", "%9b", "%9c", "%9d", "%9e", "%9f", "%a0", "%a1", "%a2", "%a3",
+ "%a4", "%a5", "%a6", "%a7", "%a8", "%a9", "%aa", "%ab", "%ac", "%ad",
+ "%ae", "%af", "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
+ "%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf", "%c0", "%c1",
+ "%c2", "%c3", "%c4", "%c5", "%c6", "%c7", "%c8", "%c9", "%ca", "%cb",
+ "%cc", "%cd", "%ce", "%cf", "%d0", "%d1", "%d2", "%d3", "%d4", "%d5",
+ "%d6", "%d7", "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
+ "%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7", "%e8", "%e9",
+ "%ea", "%eb", "%ec", "%ed", "%ee", "%ef", "%f0", "%f1", "%f2", "%f3",
+ "%f4", "%f5", "%f6", "%f7", "%f8", "%f9", "%fa", "%fb", "%fc", "%fd",
+ "%fe", "%ff"
+};
+
int htmlfd = STDOUT_FILENO;
char *fmt(const char *format, ...)
{
static char buf[8][1024];
static int bufidx;
int len;
va_list args;
bufidx++;
bufidx &= 7;
@@ -126,43 +152,45 @@ void html_attr(const char *txt)
}
t++;
}
if (t!=txt)
html(txt);
}
void html_url_path(const char *txt)
{
const char *t = txt;
while(t && *t){
int c = *t;
- if (c=='"' || c=='#' || c=='\'' || c=='?') {
+ const char *e = url_escape_table[c];
+ if (e && c!='+' && c!='&' && c!='+') {
write(htmlfd, txt, t - txt);
- write(htmlfd, fmt("%%%2x", c), 3);
+ write(htmlfd, e, 3);
txt = t+1;
}
t++;
}
if (t!=txt)
html(txt);
}
void html_url_arg(const char *txt)
{
const char *t = txt;
while(t && *t){
int c = *t;
- if (c=='"' || c=='#' || c=='%' || c=='&' || c=='\'' || c=='+' || c=='?') {
+ const char *e = url_escape_table[c];
+ if (e) {
write(htmlfd, txt, t - txt);
- write(htmlfd, fmt("%%%2x", c), 3);
+ write(htmlfd, e, 3);
txt = t+1;
}
t++;
}
if (t!=txt)
html(txt);
}
void html_hidden(const char *name, const char *value)
{
html("<input type='hidden' name='");
html_attr(name);